Local and global transmission in wireless broadcast networks

FIELD: communications.

SUBSTANCE: in different types of broadcasts, with different levels of coverage in a wireless broadcast network, each base station processes data for global transmission in accordance with the first mode (or coding and modulation scheme) for generating data symbols for global transmission and processes data for local transmission in accordance with the second mode for generating data symbols for local transmission. The first and second modes are selected based on the desired coverage for the global and local transmission, respectively. The base station also generates control signals and additional service information for local and global transmission. Data, control signals and additional service information for local and global transmission are multiplexed in their transmission intervals, which can be different sets of frequency sub-ranges, time segments or different groups of sub-ranges in different time segments. More than two types of transmissions can also be multiplexed and transmitted.

EFFECT: design of a wireless broadcast network, which can efficiently transmit different types of information with various fields of coverage.

59 cl, 13 dwg

 

In this application claims the priority of provisional patent application No. 60/514152, filed in the U.S. on October 24, 2003, entitled "Method for Transmitting Local and Wide-Area Content over a Wireless Multicast Network".

The technical field to which the invention relates

The present invention relates in General to communication systems, namely data transmission in wireless communication networks.

The level of technology

Wireless and wired broadcasting networks are widely used to provide information to a large group of users. Typical wired broadcast network is a cable network that delivers multimedia content to a large number of households. Cable network, as a rule, contains the head and distribution nodes. Each head node receives the program from various sources, generates a separate modulated signal for each program, multiplexes the modulated signals for all programs in the output signal and sends this output signal distribution nodes. Each program can be distributed over a large geographical area (e.g. a state) or a smaller geographic area (e.g. city). Each distribution node covers a certain area in a large geographic area (e.g., settlement). Each distribution is positive, the node accepts the output signals from head-end nodes, multiplexes the modulated signals for the programs which must be distributed in its coverage area, different frequency channels and sends its output signal to households within its coverage area. The output signal from each distribution node typically contains both national and local programs, which are often sent on various modulated signals, which are multiplexed into the output signal.

Wireless broadcast network transmit data via radio wireless devices within the coverage area of the network. Wireless broadcast network is different from a wired broadcast network in several key aspects. First, the signal received by different base stations in a wireless broadcast network, interferes with another signal, if these signals are not the same. On the contrary, the output signal from each distribution node is sent via dedicated cables and, therefore, does not experience interference from other distribution sites. Secondly, each base station in a wireless broadcast network, typically transmits a modulated signal that carries data for all programs broadcasted this base station, on the same radio frequency. On the contrary, each distribution node in a wired wide the broadcast network may multiplex the individual modulated signals for different programs on different frequency channels. Because of these differences in techniques used to broadcast programs in a wired broadcasting networks, as a rule, not applicable for wireless broadcast networks.

Therefore, in this technical field, there is a need to develop a wireless broadcast network, which can effectively transmit the content of different types with different areas of coverage.

The INVENTION

Hereinafter will be described a technique for transmission of different types of gears (e.g., local and global transmission in a wireless broadcast network. In this document, the term "transmission" and "broadcast" means the transmission of content/data to the user group of any size and can also denote a multicast transmission or any other term. Local transfer is a transfer that may be broadcast to a subset of transmitters for a given global transmission. Different local transmissions may be broadcast in different subsets of transmitters for a given global transmission. Various global transfer can also broadcast different groups of transmitters in the network. Local transfer can also broadcast a smaller subset of this subset of transmitters for the local transmission. Global, local and local PE is Adachi can be considered as the transfer of different types, with different levels of coverage, and coverage for each transmission is defined by all transmitters broadcasting the transmission. Global, local and local transmission, generally have different content, but these programs can also carry the same content.

Each base station (or the transmitter) in a wireless broadcast network data for global transfers are processed in accordance with the first coding scheme and modulation scheme (or mode)is selected for the global transmission, to generate data symbols for the global transmission. Data for the local transmission are processed in accordance with the second coding scheme and modulation selected for the local transmission, for generating character data for the local transmission. The first and second coding scheme and modulation can be selected based on the desired coverage from the base station for global and local transmission, respectively. Generated control signal with a time multiplexing (TDM) and/or a control signal with a frequency multiplex (FDM)used to restore the local and global transmission. Also generated additional service information, reflecting the temporal and/or frequency location of each channel of the data sent to the local and global programs. These channels Yes the data are multimedia content and/or other data, sent to local and global programs.

Data, control signals and additional service information for local and global transmission may be multiplexed in various ways. For example, the data symbols for the global transmission may be multiplexed in the "stripe transfer", dedicated to the global transmission symbols of the data for the local transmission may be multiplexed in the bandwidth allocated for the local transmission, TDM and/or FDM control signals for the global transmission may be multiplexed in the bandwidth allocated to these control signals, and TDM and/or FDM control signals for the local transmission may be multiplexed in the bandwidth allocated to these control signals. Additional service information for local and global transmission may be multiplexed in one or more of the designed bandwidth. Various strip transmission may correspond to (1) different sets of frequency subbands, if the wireless broadcast network is used FDM, (2) different time segments, if TDM is used, or (3) different groups of subbands in different time segments, if used, and TDM and FDM. Various multiplexing schemes described below. More than two different designs for the x-type transmission with more than two levels of cover can also be processed, multiplexed and transmitted.

A wireless device in a wireless broadcast network performs additional processing to recover the data for local and global transmission. Various aspects and implementations of the present invention will be described in detail below.

BRIEF DESCRIPTION of DRAWINGS

Characteristics and nature of the present invention will become clearer from the following detailed description when considering in conjunction with the drawings, in which reference numbers designate corresponding elements and in which:

Figure 1 shows a wireless broadcast network;

Figa shows the coverage area for the global transmission;

Figv shows coverage for various local programs;

Figa shows FDM structure for the broadcast of local and global programs;

Figv shows broadcasting using FDM patterns on Figa;

Figa shows TDM structure for the broadcast of local and global programs;

Figv shows broadcast transmission using TDM structure according to Fig. 4A;

Figure 5 shows the structure of superquadra to broadcast local and global programs;

6 shows the separation of subranges of the data into three disjoint sets;

Fig.7 shows the FDM control signal for the local and g is obalno transmission;

Fig shows the process of translating the local and global programs;

Fig.9 shows the process of receiving local and global programs;

Figure 10 shows a block diagram of a base station and a wireless device.

DETAILED DESCRIPTION of the INVENTION

The word "approximate" is used in this description to mean "an employee for an example or illustration". Any implementation or design described herein as "exemplary"is not to be construed as preferred or have advantages compared with other implementations or designs.

Figure 1 shows a wireless broadcast network 100, which can transmit various types of transmission, such as, for example, global distribution and local transmission. Each global transmission is transmitted by the set of base stations in the network, which may contain all or most of the base stations in the network. Each global transfer, usually broadcast on a large geographic area. Each local transmission is transmitted by the subset of base stations in a given set of this broadcast. Each local transmission, usually broadcast on a smaller geographic area. For simplicity, a large geographic region for the global transmission also called scope global the aqueous coating or just the global zone, and a smaller geographic area for the local transmission is called local coverage area or just the local area. The network 100 may have a large coverage, such as entire United States, a large region in the United States (for example, Western States, a state, and the like. For example, a single global transmission may be broadcast to the entire state of California, and various local transmission can be transmitted in various cities, such as Los Angeles or San Diego.

For simplicity, Figure 1 shows a network 100 that covers the global zone 110a and 110b, where the global zone 110a covers three local areas 120a, 120b and 120c. In General, network 100 may contain any number of global areas with a variety of global programs and any number of local zones with different local transmission. Each local area can join another local area or to be isolated. Network 100 may also transmit any number of different transmission types, intended for reception in any number of geographic areas of various sizes. For example, the network 100 may also broadcast local transmission intended for reception in a smaller geographic area, which may be part of this local area. For simplicity, in most of the following descriptions assume that the network 100 Pokrywa is the only global zone, and many local areas for the two different types of transmission.

On Figa presents coverage of global transmission in the network 100. All base stations in a given global zone showing the same global communication, and the network is a network with a single frequency. If all base stations in the global zone showing the same global transmission, the wireless device may combine the signals received from different base stations, to improve performance. On the physical level, the main sources of distortion of the receive data in the network SFN are thermal noise and performance degradation due to temporal variations and excess delay spread in the wireless channel. The variation in delay is the time difference between the first arriving signal and the last arriving signal at the wireless device.

On FIGU shows the different coverage for different local transmissions in the network 100. Base stations in different local areas and transmit various local transmission, and the network is a network with multiple frequencies (MFN).

Terms SFN and MFN are commonly used terms to describe the characteristics of the network, and MFN network does not always mean that different base stations transmit on different frequencies. Even if the base stations in different local areas showing different local transmission, wireless mouth is eusto within this local area may experience some interference from base stations in adjacent local areas due to the relatively large distance to the interfering base station. For example, the wireless device 1 in the local area A, the wireless device 4 in the local area B and the wireless device 6 in the local area can feel a little interference from adjacent local areas. Local transmission is essentially SFN transmission for these internal wireless devices.

A wireless device near the border of the local zone can observe the significant interference of adjacent local channels (ALCI) from signals transmitted by the base station in the neighboring local area. For example, the wireless device 2 in the local area And can experience significant ALCI interference from base stations in adjacent local areas B and C, the wireless device 3 in the local area B may experience significant ALCI interference from base stations neighboring local areas A and C, and the wireless device 5 in the local area may experience significant ALCI interference from base stations neighboring local areas A and B. the Network is essentially a network of MFN for these peripheral wireless devices. ALCI interference leads to additional performance degradation, compared to the case with SFN network. If the data is processed and transmitted in the same way as for SFN and MFN, ALCI interference observed by the peripheral wireless devices if MFN, degrades the quality of a received signal on these devices and causes a reduction of the coating on the boundaries of neighboring local areas.

In the General case cover for each type of transmission (e.g., global or local) can meet the use requirement for this type of transfer. Transmission with wider applicability can be sent to wireless devices in large geographical areas. Accordingly, with more limited applicability can be sent to wireless devices in smaller geographical areas.

The network 100 may be designed to provide good performance for both local and global transmission. This can be achieved by performing the following:

multiplexing of local and global transmission time, frequency and/or code domain so that interference between the two types of transmission decreased;

transmission of local and global programmes (together with the relevant control signals) on the basis of different characteristics of MFN and SFN, respectively; and

provide flexibility in the allocation of resources to meet the requirements of variable (source) rate for local and global transmission.

Local transmission is sent on the basis of MFN characteristics to ensure the best coverage for b is Provodnik devices located on the borders of local zones. Global transmission for different global zones also have MFN character at the boundaries between the global zone and can be sent using the above methods. Each of the three above aspects are described in detail below.

1. Multiplexing of local and global transmission

On Figa shown FDM structure 300 that may be used to broadcast local and global transmission through the given system bandwidth in a network with multiple carriers. FDM structure 300 supports the receiving both local and global transmission receiver, configured on a single radio frequency, and it is different from the scheme, which sends local and global transmission using different radio frequencies. The total system bandwidth is divided into multiple (N) orthogonal frequency subbands using modulation techniques with many of bearing, for example, multiplexing orthogonal frequency division signals (OFDM) or any other technique. These sub-bands are also called tones, carrier, carriers, elements of the encoded signal and the frequency channels. When using OFDM, each sub-band is associated with a corresponding sub-carrier, which may be modulated with data. And the total number of sub-bands N, U sub-bands can be used to transfer data and control signal, and they are called "used" sub-bands, where the UN. The remaining G subbands are not used and are called "protective" sub-bands, where N=U+g). as a specic example, the network may use OFDM structure with N=4096 sub-bands, with U=4000 used sub-bands and with G=96 protective sub-bands. In the General case of N, U and G can take any value. For simplicity, in the following description, it is assumed that all N subbands used for transmission, that is, U=N and G=0, so in this case there is no protective sub-bands.

In each symbol period of the transmission data P of the N sub-bands used sub-bands can be used for control signal FDM and called the control sub-bands, where P<N. the Control signal, typically composed of known modulation symbols, which are processed and transmitted in a known manner. The remaining D-used sub-bands can be used for data transmission and are referred to as sub-bands of data, where D=N-p Control signal TDM may also be referred to in some symbolic periods all N used sub-bands.

For the implementation shown in Figa, control FDM signal transmitted by the P control sub-bands and distributes the I bandwidth of the entire system to provide better sampling of the frequency spectrum. D subranges of data can be allocated to local transfer, global transfers, additional service information, and so forth. The set of Lsbthe sub-bands may be allocated for the local transmission, and a set of Wsbthe sub-bands may be allocated for global communications, where Wsb+LsbD. Wsbranges for global transmission and Lsbof sub-bands for the local transmission can be distributed across the bandwidth of the system to improve frequency diversity, as shown in Figa. Wsbthe subranges are data for the global transmission (or global data), and Lsbthe subranges are data for the local transmission (or local data).

On FIGU shows the data transfer for different local areas using FDM structure 300. To minimize interference between the local and the global transmission all base stations in the global zone, use the same set of Wsbranges for global broadcast transmission. Base stations in different local areas can broadcast different local transmissions on the set of Lsbthe sub-bands allocated for local transmission. The number of sub-bands allocated to local and global transmission can vary based on the required resources. For example,W sband Lsbcan vary (1) dynamically from symbol to symbol or from time interval to time interval, (2) based on the time of day, day of week and so on, (3) based on a predefined schedule, or (4) based on the combination of the above. For example, Wsband Lsbcan dynamically vary during part of each day of the week, may be fixed during the remainder of each day of the week and can be set based on a predefined schedule for the weekend.

To facilitate resource allocation and improve frequency diversity N used sub-bands can be ordered in M alternations or sets of non-overlapping sub-bands. M alternations are disjoint, since each of the N used subbands belongs to only one alternation. Each alternation contains P used sub-bands, where N=M·P. P subbands in each alternation can be evenly distributed over the N used sub-bands, so that the successive sub-bands in each alternation of M are separated by podobiznami. For an exemplary OFDM structure described above can be formed alternating with M=8, where each alternation contains P=512 used subbands that are uniformly distributed with spacing 8 p is diapazonov. P used subbands in each alternation alternating with P used ranges in each of M-1 alternation.

Exemplary OFDM structure and scheme of crop rotation was described above. Other OFDM structure and scheme of allocation of sub-bands can also be used to support FDM for local and global transmission.

On Figa shown TDM structure 400 that can be used to broadcast local and global transmission network with a single carrier or multiple carriers. Temporary transmission line is divided into frames 410, each frame has a predefined duration. Frame duration may be selected based on various factors such as the amount of temporary separation, the desired data. Each frame contains a field 412, a carrier control signal and additional service information, segment 414, supporting global data, and the segment 416, supporting local data. Each frame may also contain fields for other information.

On FIGU shows the data transfer for different local areas using TDM structure 400. To minimize interference between the local and the global transmission of the global segment 414 for all base stations in the global zone can be located in time so that these base stations transmit global PE is edacho at the same time. Base stations in different local areas can broadcast various local transmission in the segment 416. The sizes of the segments 414 and 416 may vary dynamically or predetermined manner based on the requirements of the resource.

For FDM patterns 300 Figa and TDM structure 400 Figa, local and global transmission multiplexed in frequency and time, respectively, so that the overlap between these two types of transmission was minimal. This distribution avoids or minimizes the interference between the two types of transmission. However, strict adherence to neprekritaya transmission of different types is not required. Moreover, different local areas may have different frequency or timing. In the General case, different patterns of multiplexing can be used to broadcast different types of transmission at different coverage areas. A specific structure of the multiplexing suitable for wireless broadcasting networks OFDM, described below.

Figure 5 shows an example structure 500 supercade, which can be used to broadcast local and global transmission in a wireless broadcast network based on OFDM. The data transfer occurs in blocks of superquadra 510. Each supercar has a predetermined lifespan is here, which can be selected based on various factors, such as, for example, the desired statistical multiplexing for broadcast data streams, the value of temporary explode, desired for data streams, the detection time for data streams, the buffer requirements for wireless devices and so on. Supercat size in 1 second can provide a good balance between the various factors mentioned above. However, can also be used supercarry a different size.

For the implementation shown in Figure 5, each supercar 510 contains the segment header 520, four frame a-530d same size and the final segment 540, which is not shown to scale in Fig. 5. Table 1 shows the various fields for segments 520 and 540 and for each frame 530.

Table 1
FieldDescription
Control signal TDMControl signal TDM used for signal detection, synchronization frames, the estimation error of the frequency and time synchronization
Control signal transitionControl signal transition that is used for channel estimation and possible synchronization of time and sent to the border global and local p is lei/transmission
WICGlobal channel identification (WIC) - is the ID assigned to serve global zone
LICGlobal channel identification code (LIC) - is the ID assigned serviced by the local district
Global OISSymbol global additional service information (OIS) carries additional service information (e.g., frequency/location in time) for each channel of data sent in the field of global data
Local OISLocal OIS - bears additional service information for each data channel that is sent to the local data
Global dataIs data channels for the global transmission
Local dataCarries the channels of the data for the local transmission

For the implementation shown in Figure 5, different control signals are used for different purposes. Control the TDM signal is transmitted at the beginning of each superquadra and can be used for the purposes noted in table 1. Control signal transmission is sent on the border between local and global fields/transmission, enabling a smooth transfer between local and global fields/transmission, and can be with ameriloan, as is described below.

Local and global transfer can be for multimedia content such as video, audio, Teletext, data, video/audio and so forth, and can be sent in a separate data streams. For example, a single multimedia program (e.g., television) can be sent in three separate data streams for video, audio and data. The data streams are sent over the data channels. Each data channel can carry one or multiple data streams. The data channel carrying data streams for local transmission, is also called a local channel and the data channel carrying data streams for global distribution, also called the global channel. Local channels are sent in the fields of local data and global channels are sent in the fields of global data superquadra.

Each data channel can be allocated a fixed or variable number of alternations in each supercade, depending on the load on the data channel, the presence of alternations in supercade and other factors. Each data channel can be active or inactive at any given supercade. Each active data channel is allocated at least one alternate. Each active data channel is also assigned specific rotation supercade schema-based distribution that p is W (1) pack all the active channels of data in the most efficient manner, (2) to reduce the transmission time for each data channel, (3) to provide adequate temporary separation for each data channel, (4) to minimize the number of signals required to indicate alternations assigned to each data channel. For each data channel one and the same distribution of alternations can be used for the four frames of superquadra.

The local OIS denotes the time-frequency distribution for each active local channel for the current superquadra. Field global OIS denotes the time-frequency distribution for each active global channel for the current superquadra. Local OIS and global OIS are sent at the beginning of each superquadra in order for a wireless device can determine time-frequency location of each relevant channel data supercade.

Different fields of superquadra can be sent in the order shown in Figure 5, or any other order. In General, it is desirable to send the control signal TDM and additional service information at the beginning of superquadra, so that the control signal TDM and additional service information could be used to receive data sent supercade later. Global transfer can be sent before the local transmission is th, as shown in Figa and 5, or after the local transmission.

Figure 5 shows a specific structure of superquadra. In General, supercat may have any length and contain any number of segments of all types, frames and fields. However, as a rule, there is a certain range duration superquadra associated with the detection time and cyclical time of the receiving electronics. The other structures of superquadra and frame can also be used to broadcast different types and they all fall within the scope of the present invention.

Multiplexing time division local and global transmission, as shown in Figure 5, makes it possible to use the advantages of OFDM for global transmission network with a single carrier frequency without interference from local transmission. Since only local or global transmission is sent at any given point in time using TDM, local and global transmission can be transmitted using different transmission parameters that can be independently optimized to achieve good performance for local and global transmission, respectively, as described below.

2. Data transfer

Global channels which are broadcast in each supercade, mouthbut Packed in the most efficient manner. All base stations in the global zone showing the same global transmission in the four fields of global data superquadra. The wireless device may then be combined global transmission received from any number of base stations to improve the reception quality of the data.

Base stations in different local areas showing different local transmission in the four fields of the local data in each supercade. Peripheral wireless device, located near the border of neighboring local areas will suffer from the interference of adjacent local channels (ALCI), which degrades the quality of the received signal. The quality of the received signal can be measured using the signal-to-noise and interference (SINR) or any other measure. Peripheral wireless device will achieve a lower SINR values due to degradation caused by ALCI. At the base station data for the local transmission are processed using the coding scheme and modulation, which requires a certain SINR values for proper reception. ALCI has the effect of compressing the local area, as this wireless device can achieve the desired SINR values in the lower zone in the presence of ALCI.

Various techniques can be used to improve coverage for local predacity techniques usually degrade the performance within the zone to expand coverage at the border. These techniques include partial download and select encoding/modulation.

When using partial load, which is also called frequency re-use, not all the sub-bands that can be used to transfer the data actually used for data transmission. Moreover, neighboring local areas can be assigned to the sub-bands so that their local transmission interfere between a minimum. This can be achieved using orthogonal partial loading or random partial load.

When orthogonal partial loading of the adjacent local areas are assigned disjoint sets of sub-bands. Then the base station in each local zone local broadcast transmission on the set of sub-bands assigned to this local area. Because the ranges do not intersect, then the wireless devices in each zone do not feel ALCI from base stations in adjacent local areas.

Figure 6 shows the approximate split D bands of data into three disjoint set, denoted by S1, S2and S3. In General, each set may contain any number of sub-ranges of the data and any of the D bands Dunn is H. Sub-bands for each set can also be changed dynamically, or a predefined way. To achieve frequency diversity, each set may contain sub-bands selected by rotation of the D bands of data. The subbands in each set may be evenly or unevenly distributed on the D subranges of data.

Contact Figv local area And can be assigned a set of sub-bands S1local zone B can be assigned a set of sub-bands S2,and the local zone C can be assigned a set of sub-bands S3. Then the base station in the local area A local broadcast transmission to local areas A set of sub-bands S1base station in the local area B local broadcast transmission to local areas A set of sub-bands S2,and the base station in the local area C local broadcast transmission to local areas A set of sub-bands S3.

Figv and 6 show the case of the three local areas. Orthogonal partial download can be extended to any number of local zones. Q disjoint sets of sub-bands may be formed adjacent to Q local areas, where Q>1. Q sets can contain the same or a different number of sub-bands. For the scheme of alternation described above, M is 1 turn the work, existing data can be allocated to Q sets. Each set can contain any number of alternations. Rotation for each set can be changed dynamically, or a predefined way. Each local area is assigned a corresponding set of alternations for the local transmission. Frequency planning can be performed for the entire network in order to ensure that neighbouring local areas assigned disjoint sets.

When using random partial loading of each local area is assigned to the K sub-bands of data, where KD, and the base station in this local area broadcasts a local transmission on the K sub-bands, the selected pseudo-random manner from the D bands of data. For each local zone generator pseudo-random number (PN) can be used to select different sets of the K subbands in each symbol period. Different local areas may use different PN generators to ensure that the sub-bands used by each local area were random with respect to the sub-bands used in adjacent local areas. In fact, the local transmission for each local zone switches on D subranges of data. ALCI is observed when there is a collision, and neighboring local areas COI is lsout the same sub-band in the same symbol period. However, ALCI accidentally, because of the random selection method K podepsanou in each symbol period for each local area. Wireless device knows about the frequency performed by the base stations, and can perform the appropriate convolution of the signal with pseudo-random frequency to restore local transmission.

For random partial downloading the probability of collision is reduced and the amount of ALCI decreases with decreasing K. Thus, the coating can be extended with smaller values of K. However, smaller values of K lead to a reduction in the overall throughput of this scheme of coding and modulation. Thus, K can be chosen based on the balance between the coverage area and the total capacity.

For partial load any type of transmit power for each subband used for data transmission can be increased without increasing the total power transmission. Full transmit power can be distributed over K poddiapazona used for local transmission in each symbol period, which may be called the active sub-bands. If K sub-bands is used for the local transmission, and D sub-bands is used for the global transmission, where K<D at partial load, then the power before the Chi on the active sub-range is higher for the local transmission in comparison with the global transfer. The quality of the received signal on the active channel, thus, higher at partial loads, which increases the signal to noise and interference for sub-band of the receiver.

Orthogonal and random partial loading can only apply for subbands of the data only for the control of sub-ranges or sub-ranges of data and control sub-bands. Orthogonal and random partial loading can improve coverage price reduction of the total bandwidth. This is because a smaller number of sub-bands is used for data transfer with partial loads, and fewer information bits may be sent in each symbol period on this smaller number of sub-bands. The number of sub-bands for use in local transmission may be selected based on the balance between improving coverage and total bandwidth.

The network may support a set of modes of transmission or just a mod. Each mode is associated with a particular coding scheme or encoding speed, a specific modulation scheme, a certain spectral efficiency and a certain minimum value of the SINR required to achieve a certain level of performance, for example, the frequency of occurrence of erroneous packets 1% (PER) for continuous AWGN channel. The range is supplemented flax efficiency can be defined in such units, as information bits per modulation symbol and be determined based on the coding rate and modulation scheme. In General, the mode with a lower spectral efficiency have lower desired value of the SINR. For each mode to the desired value of the SINR can be obtained based on the specific system design (such as speed coding scheme, interleaving and modulation scheme used for this mode) and a profile of the channel. The desired value of the SINR can be determined using computer simulation, empirical measurements, and so forth.

Coverage for local transmission can be adjusted by selecting the appropriate fashion for use in local transmission. Fashion with a lower desired value of the SINR can be used for local transmission to expand coverage near the border with neighbouring local areas. Some fashion transfer, which will be used for local transmission may be determined based on the balance between improving coverage and spectral efficiency. Coverage for global transmission can be similarly adjusted by selecting the appropriate fashion for the global transmission. In General, the same or different modes can be used for local and global re the Ah.

Coverage for local transmission may be improved by partial loading and/or choice of fashion. Coverage can be extended when using a smaller percentage of used sub-bands and/or selection of fashion with a lower spectral efficiency. The speed of information bits (R) can be expressed as followswherethere is spectral efficiency for a selected fashion, and K is the number of active sub-bands. Given the speed of information bits can be achieved by using (1) the subset of all subranges data and fashion with higher spectral efficiency, or (2) all subranges data and fashion with lower spectral efficiency. It can be shown that the second option provides the best performance (for example, greater coverage at a given value PER) compared to option (1) for certain scenarios (e.g., for partial load and without assessing interference).

3. The transfer control signal

7 shows a diagram of the transmission control signal, which can support both local and global transfers. For simplicity, Fig.7 shows the transmission of the control signal for one frame in supercade. Each base station transmits con the roll signal transition between local and global fields/transmission. Each base station also transmits a control signal FDM for one rotation in each symbol period, together with data transmission. For the implementation shown in Fig.7, eight alternations found in each symbol period, and control the FDM signal is transmitted in the sequence 3 in the even indices symbol period and in the alternation of 7 in the odd indices of character period, which can be seen as biased template {3,7}. Control signal FDM can also be transferred to other displaced templates, such as {1,2,3,4,5,6,7,8} and {1,4,7,2,5,8,3,6}.

As shown in Fig.7, the control FDM signal is transmitted over the global transmission and for the local transmission. Control signal FDM can be used to obtain (1) channel estimation for global distribution, also called the global channel, and (2) channel estimation for the local transmission, which is also called evaluation of local channel. Evaluation of local and global channels can be used for detection and data decoding for local and global transmission, respectively.

Control signal FDM passed during the global transfer is called global control signal FDM and can be designed to facilitate the evaluation of the global channel. The same global control signal FDM to outproduces throughout the global zone. Control signal FDM passed within the local transmission is called the local control signal FDM and can be designed to facilitate the evaluation of the local channel. Various local control signals can be transmitted to different local areas in order to make possible the reception of local estimates of the channel for different local areas of the wireless device. Various local control FDM signals interfere with each other in the boundary of the local zones, similar to the ALCI for various local transmission. Local control signals FDM can be designed so that a good estimate of the local channel can be obtained in the presence of interference control signal from the neighboring local areas. This can be achieved by using orthogonalization or randomization local control signals FDM for different local areas in terms of frequency, time and/or encoding method, as will be described below.

Figure 7 also shows the implementation of the local control signal FDM. The set of P-modulated symbols used for P control sub-bands for the local control signal FDM. P modulated symbols may be multiplied by the first sequence of complex values in the frequency and/or the second sequence of complex values for the time for generation of the AI control characters for the local control signal FDM. First posledovatelnosti denoted as {S(k)}, whereS(k) is a complex value for a subrange of thek. The second sequence is denoted as {C(n)}, whereC(n) is a complex value for a symbolic period ofn. Various characteristics can be obtained for the local control of the FDM signal by using the first and second sequences of different types.

PN generator may be used to generate the first sequence of complex values. PN generator may be a linear shift register with feedback (LFSR), which implements the selected polynomial generator, for example,. PN generator is initialized specific calibration value (or initial state) at the beginning of each symbol period and generates a sequence of pseudo-random bits. These bits are used to form the integrated values of the first sequence.

Control characters for the local control signal FDM for the local zone can be calculated as:

, 1)

Wherethere is a control symbol for subband,k- character periodn. Equation (1) implies that the modulation symbols used for localregional FDM signal, have values of 1 +j0.

Accepted control symbols in a wireless device can be expressed as:

(2)

wherecontrol character sent by subrangekcharacter periodnbase station to the desired local area (i.e. the desired base station);

- the actual channel response for the desired base station;

control character sent by subrangekcharacter periodnthe interfering base station in the neighboring local area;

- the actual channel response for the interfering base station;

- adopted control signal for a subrange of thekcharacter periodn;

- noise for subbandkcharacter periodn.

For simplicity, in equation (2) assumes the presence of one desired base station and one interfering base station, which is denoted by the indexI.

Local control signals FDM for different local areas can be orthogonalization time and/or frequency by passing these local control signals in FDM various symbol period and/or sub-bands, respectively. However, less control characters must be sent to the local control signal FDM in each local area, and therefore less control characters will be available to assess the local channel.

Local control signals FDM for different local areas can also be orthogonalization and/or randomized in the code domain using a different orthogonal and/or random sequences, respectively, for these local control signals FDM. Various methods of orthogonalization/randomization code can be used for local control of FDM signals, including orthogonal permutation random permutation and orthogonal and random permutation.

For orthogonal permutations local control signals FDM for different local areas are multiplied by an orthogonal sequence symbolic periods. Control characters for the desired and interfering in local zones can be expressed as:

and(3)

whereorthogonal. As shown in equation (3), the same PN sequence used to generate the first sequence of complex quantities for the desired and interfering in the local area. However, different orthogonal sequencesandused for the desired and interfering in the local area.

The wireless device may display the evaluation of the local channel by using, first, estimate the complex gain of the channel for each control sub-bands used for local control of the FDM signal, as follows:

(4)

Equation (4) eliminates the effects of PN sequence by the control sub-bands, also referred to as descrambling. The wireless device receives P estimates of the gain channel to P uniformly distributed control sub-bands. Then the wireless device performs a P-point inverse discrete Fourier transform (IDFT) on P estimates the gain of the channel to obtain P-idler estimates an impulse response using the least squares method, which can be expressed as follows:

, (5)

wherethere is an index to the branch channelto estimate an impulse response;

there is a valid pulse QCD is the IR for the desired base station;

there is a valid pulse response for the interfering base station;

some estimates an impulse response using the least squares method for character periodwhere the indexosdenotes the orthogonal permutation; and

there is a noise for a symbolic period.

In equation (5) assumes that the actual impulse response of the channel for each base station is constant over the relevant time period, soandare not a function of symbol period.

Estimation of the pulse responsefor the desired local area can be obtained by filtering the estimated impulse response by the method of least squares for different symbol periods as follows:

(6)

whereasandare orthogonal sequences;

there is a noise after processing; and

L is the length of the orthogonal sequence (e.g., L = 3).

The Indus is the COP summation in equation (6) is defined for odd values of L and differs for even values of L. A wireless device located in the interfering local area, can lead the evaluation of the impulse responsefor the local area by multiplyingand integrating along the length of the orthogonal sequence. As shown in equation (6), orthogonal permutation can suppress the interference control signal from the neighboring local areas. However, the orthogonality may be compromised due to the time variations of the channel.

Orthogonal sequences can be defined in various ways. In the same orthogonal sequence is determined as follows:

andforn= 0 ... (L - 1). (7)

For a random permutation control characters for the desired local area are pseudo-random with respect to the control characters for interfering in the local area. Control characters can be considered independently and identically distributed (i.i.d) with time, frequency and the local areas. Pseudo-random control characters can be obtained by initializing the PN generators for different local zones of different initial numbers, which depend on the character of the periodnand ID locally the area.

For a random permutation, the evaluation of the impulse response using the least squares methodcan be obtained by performing (1) descrambling, as shown in equation (4)to eliminate the pseudo-random sequence for the desired local area, (2) further processing to obtain P estimates of the gain channel, and (3) IDFT P estimated gain of the channel, as described above. Evaluation of the impulse response by the method of least squares can be expressed as:

, (8)

wherethere is interference toth branchand the indexrsdenotes a random permutation. Interferencearises from the fact that the impulse response of the channelfor interfering local zone is diffused in the P branchPN sequences for local and interfering zone. Evaluation of the impulse response using the least squares method can be used directly as an estimate of an impulse response for the desired local area. Equation (8) shows that a random permutation only blurs (or suppresses) the interference control signal from SOS the days of the local zone. Thresholding can be done to save the branches of the channel that exceeds a predefined threshold value and to reset the branches of the channel is below a predetermined threshold value. Adjustment of the threshold can eliminate most of the interference control signal and can provide performance comparable to the performance achieved in the orthogonal permutation. In addition, when a random permutation, the performance of the channel estimation does not depend on the orthogonal and can be more reliable under certain operating conditions.

For orthogonal or random permutation local control signals FDM for different local areas are multiplied by different PN sequences into subranges and then multiplied by different orthogonal sequences symbolic periods. Control characters for the desired and interfering local zone can be expressed as follows:

and, (9)

whereanddifferent pseudo-random sequence, andanddifferent orthogonal sequences.

For orthogonal and random permutations evaluation of the pulse is snogo response by the method of least squares can be obtained by performing the processing described above for orthogonal permutations. Evaluation of the impulse response by the method of least squares can be expressed as:

, (10)

where the indexordenotes the orthogonal and random permutation. Estimation of the pulse responsefor the desired local area can be obtained by multiplyingand integrating over the length of the orthogonal sequence, as shown in equation (6).

The discrete impulse response of the channel for each (local or global) zone contains up to N branches, where N=M·P. Impulse response of the channel can be considered as consisting of a main channel and a redundant channel. The main channel includes a first P branches of the impulse response of the channel. Redundant channel contains the remaining N-P junction. If the control FDM signal is transmitted in one alternation with the P sub-bands, an estimate of an impulse response,orwith P branches can be obtained on the basis of the control signal FDM. In the General case, the length of the estimation of the impulse response is determined by the number of different sub-bands, use the bathrooms for the control FDM signal. The longer the estimation of the impulse response of the channel, with more than P branches, can be obtained by sending a control signal FDM in a greater number of alternations. For example, the control signal FDM can be transmitted over two different alternations in different symbol periods, as shown in Fig.7. Methods for determining the coefficients of temporal filters for the primary and redundant channels are described in U.S. patent No. 10/926,884 dated August 25, 2005, entitled "Staggered Pilot Transmission for Channel Estimation and Time Tracking".

Various channel estimation can be obtained for local and global zones. The wireless device can receive signals from base stations that are stronger removed for global transmission, compared with the base stations for the local transmission. Accordingly, the propagation delay for the global transmission may be greater than the propagation delay for the local transmission. The longer the estimation of the impulse response of the channel (e.g., 3P) can be obtained for the global zone. The shorter estimate an impulse response of the channel (for example, 2P) can be obtained for the local zone.

The longer the estimation of the impulse response of the channel for the global zone can be obtained by using a larger number of the interchange control signal FDM for the global zone. As the viola is native the same number of alternations can be used for control signal FDM for local and global zones. Evaluation of the impulse response using the least squares method for the global zone can be filtered with the first set of one or more temporary filters to obtain filtered estimates an impulse response with a given number of branches (for example, 3P) for the global zone. Evaluation of the impulse response by the method of least squares to the desired local zone can be filtered with the second set of temporary filters to obtain filtered estimates an impulse response with a given number of branches (for example, 2P) for the local area.

In General, the temporal filtering for channel estimation can be performed based on various considerations, such as, for example, the manner in which the transmitted control signal FDM, the number of alternations used to control FDM signal, the desired length (or number of branches) to estimate an impulse response of the channel, the suppression of interference and so on. Temporal filtering may be performed in different ways for control signals FDM for local and global zones, for each of the filtered estimates of the channel response to local and global zones.

Filtered estimate of the channel response for the given (local or global) zone can be further processed to further improve air permeability the property. Additional processing may include, for example, the installation of the latest Z branches is equal to zero, where Z can be any integer, installation branches with energy below a predetermined threshold value, is equal to zero (cutoff threshold), and so on. Additionally processed branch channel can be transformed using DFT to obtain the final estimation of the frequency response used for detection and data decoding.

Referring to Figure 5, the control signal transition can be used for channel estimation, synchronization, time of capture (e.g., automatic power control (AGC)and so on. For example, the control signal transition may contain control signal FDM, so temporal filtering for each symbol period may be performed for the received control characters received for the current symbol period, at least one of the earlier character of the period, and at least one next symbol period. Control signal transition can also be used to obtain improved synchronization for the local transmission, and global distribution.

4. Broadcast transmission and reception

On Fig shows a sequence chart of operations for a process 800 broadcast local the th and global transmission in the network 100. Each base station in the network may perform process 800 in each planned interval, which may be, for example, each character period for FDM patterns 300 Figa, each TDM frame for structure 400 Figa or each superatom structure 500 superquadra in Figure 5.

Data for global transfers are processed in accordance with the first coding scheme and modulation (or mode)is selected for the global transmission, to generate data symbols for the global transmission (block 812). Data for the local transmission are processed in accordance with the second coding scheme and modulation for local transmission to generate character data for a local transmission (block 814). Various coding schemes and modulation can be used for local and global transmission to achieve the desired coverage. Additional service information for local and global transmission is determined in blocks 816 and 818. Control signal FDM for the global zone, the control signal FDM for the local zone and control signal transition is generated in blocks 822, 824 and 826, respectively.

For more service information for the global transmission and optional overhead information for the local transmission are multiplexed allocated to them in the intervals of transmission (block 832 and 834). The data symbols for obalno transmission are multiplexed in the transmission interval, selected for the global transmission (block 836), and the control characters for the global control signal FDM multiplexed in the transmission interval allocated to this control signal (block 838). Similarly, the character data for the local transmission are multiplexed in the transmission interval allocated to local transmission (block 840), and control characters for the local control signal FDM multiplexed in the transmission interval allocated to this control signal (block 842). Each transmission interval may correspond to a group of sub-bands (e.g., FDM structure 300), time segment (e.g., TDM structure 400), the group of sub-bands in the time segment (for example, the structure 500 superquadra) or any other type of time-frequency allocation. The control signals TDM and transition, other control signals, and other data can be multiplexed in block 844. Then multiplexed additional service information, control signals and data for local and global transmission is transmitted in block 846.

Figure 9 shows a sequence chart of operations for a process 900 for receiving local and global programs, broadcast by the network 100. A wireless device in the network can perform the process 900 in any planned interval.

Wireless is a great device receives the broadcast from the local and the global transmission (block 912). The wireless device processes the control signal for TDM receive frame synchronization and symbol, evaluating and correcting the frequency error, and so forth (block 914). The wireless device identifies global and local channels for processing using WIC and LIC, respectively, which are shown in Figure 5 (block 916). Then the wireless device can be restored to a local transfer, global transfer or local and global transmission of the accepted broadcast.

If the wireless device has adopted a global transfer, as determined in block 920, the wireless device further demultiplexes and handles additional service information for global distribution to determine the time-frequency location of each interest global channel (block 922). The wireless device also demuxes and processes of global control signals FDM and the transition from the transmission interval allocated to these control signals (block 924), and outputs the channel estimation for the global zone (block 926). The wireless device further demultiplexes the data symbols for the global channels of the transmission interval allocated to the global transmission (block 928). Then the wireless device processes the data symbols for the global transmission based on an assessment of the global the social channel and in accordance with the encoding scheme and demodulation, applicable for global transmission, and restores the data for each interest global channel (block 930).

If the wireless device has received local transfer, as determined in block 940, the wireless device further demultiplexes and handles additional service information for the local transmission to determine the time-frequency location of each interest local channel (block 942). The wireless device also demuxes and handles local control signals FDM and the transition from the transmission interval allocated to these control signals (block 944), and outputs the channel estimation for the desired local area (block 946). The wireless device further demultiplexes the data symbols for the local channels from the transmission interval allocated to local transmission (block 948). Then the wireless device processes the character data for the local transmission based on an assessment of the local channel and in accordance with the encoding scheme and a demodulation applicable for the local transmission, and restores the data for each interest local channel (block 950).

If the wireless device accepts local and global transmission, the wireless device may perform processing in a different order from the order shown in Fig.9. For example the EP, the wireless device may demultiplex and process customer service information for both local and global transmission when receiving this information.

5. System

Figure 10 shows the block diagram of the base station 1010 and the wireless device 1050 in a wireless broadcast network 100 of figure 1. Typically, a base station 1010 is a fixed station and may also be called an access point, a transmitter or something else. Wireless device 1050 may be fixed or mobile and may also be called user terminal, mobile station, the receiver or something else. Also the wireless device 1050 may be a portable unit, such as a cell phone, a handheld device, a wireless module, a personal digital assistant (PDA) and the like.

At the base station processor 1010 1022 data transmit (TX) receive data for the global transmission from sources 1012, processes (e.g., encodes, summarizes, and displays characters in global data and generates data symbols for the global transmission. The data symbols are modulation symbols for data, and a modulation symbol is a complex value of a point in the combination signal to the modulation scheme (for example, M-PSK, M-QAM, and the like). TX processor 1022 data also generi is the duty to regulate the control signals FDM and transition to the global zone, belongs to the base station 1010, and provides data and control characters for the global zone to the multiplexer (Mux) 1026. TX processor 1024 data receives the data for the local transmission from a source 1014, processes local data and generates data symbols for the local transmission. TX processor 1024 data also generates control signals FDM and transition for the local zone, belongs to the base station 1010, and provides data and control characters for the local zone to the multiplexer 1026. Coding and modulation for data can be selected based on various factors, such as, for example, whether the data to a local or global transmission of the data type, the desired coverage for data and so on.

The multiplexer 1026 multiplexes the data symbols and the control signals for the local and global zones, and characters for additional service information and control of the TDM signal into sub-bands and periods of characters allocated for these characters. The modulator (Mod) 1028 performs modulation in accordance with the method of modulation used by the network 100. For example, the modulator 1028 may perform OFDM modulation on the multiplexed symbols to generate OFDM symbols. Block 1032 transfer (TMTR) converts characters from the modulator 1028 into one or more analog signal and Supplement the sustained fashion handles (for example, amplifies, filters and converts with increasing frequency) analog signals to generate modulated signals. Then the base station 1010 transmits the modulated signal through the antenna 1034 wireless devices on the network.

The wireless device 1050 transmitted from the base station 1010 signal from an antenna 1052 and is provided to block 1054 reception (RCVR). Block 1054 reception processes (e.g., filters, amplifies, converts with decreasing frequency) of the received signal and digitizes the processed signal to generate a stream of data samples. A demodulator (Demod) 1060 performs (e.g., OFDM) demodulation of the data samples and provides received reference symbols block 1080 assessment synchronization (Sync) channel. Block 1080 also receives sample data from the block 1054 reception, determines the timing of frames and symbols based on the data samples and outputs the channel estimation for the local and global zones on the basis of the received control characters for these zones. Block 1080 provides synchronization symbols and the estimate of the channel demodulator 1060 and provides synchronization frames the demodulator 1060 and/or the controller 1090. The demodulator 1060 performs the detection data in the received character data for a local transmission with the assessment of the local channel, performs the detection data in the received data symbols for the global transmission of the evaluation of the global channel and provides detected data symbols for the local and global transfers demultiplexer (Demux) 1062. Detected data symbols are estimated symbols of the data sent to the base station 1010, and can be represented in the form of a logarithmic relationship likelihood (LLRs) or in another form.

The demultiplexer 1062 provides detected data symbols for all interested in global channel processor 1072 data reception (RX) and provides detected data symbols for all of the local channels to the processor 1074 data reception (RX). RX processor 1072 data processing (for example, eliminates striping and decodes) the detected data symbols for the global transmission in accordance with the appropriate scheme demodulation and decoding, and provides data for the global transmission. RX processor 1074 data processes the detected data symbols for the local transmission in accordance with the appropriate scheme demodulation and decoding and provides the data for the local transmission. In General, the processing by demodulator 1060, demultiplexors 1062, RX processors 1072 and 1074 in the wireless device is compatible with the processing by modulator 1028, multiplexer 1026 and TX processor 1022 and 1024, respectively, on the base station 1010.

The controller 1040 and 1090 control the operation of the base station 1010 and the wireless device 1050, respectively. Blocks 1042 and 1092 memory stores code and the data, used by the controller 1040 and 1090, respectively. The scheduler 1044 plans to broadcast local and global transmission and selects and allocates resources for transmission of different types.

For simplicity, figure 10 shows the processing of data for local and global transmission performed by two different processors data at the base station 1010 and the wireless device 1050. Data processing for transmission of all types can be performed by a single processor data at each base station 1010 and a molar device 1050. Figure 10 also shows the processing for transmission of two different types. In the General case of any number of types of gears with different coatings can be transmitted to the base station 1010 and accepted wireless device 1050. For clarity, figure 10 also shows that all the blocks of the base station 1010 are located on the same installation. In General, these units can be on the same or on different plants and can interact via various communication channels. For example, the source 1012 and 1014 data can be located outside the installation, block 1032, the transfer and/or antenna 1034 can be located on the losing installation and so on.

The multiplexing scheme described here (for example, on Figa, 4A and 5), have various advantages compared with the traditional scheme, which transmits PE is Adachi different types on different RF channels. First, the multiplexing scheme described here can provide more frequency diversity compared with the conventional circuit, since the transmission of each type is passed across the bandwidth of the system in contrast to a single radio frequency channel. Secondly, the multiplexing scheme described here allows the unit 1054 to receive and demodulate the transmission of all types with a single radio unit, which is configured on a single radio frequency. This simplifies the design of the wireless device. On the contrary, the traditional scheme may require a lot of radio blocks to restore the transmission of various types that are sent on different RF channels.

The techniques described here to broadcast different types of radio can be implemented in a variety of ways. For example, these techniques may be implemented in hardware, software, or in combinations thereof. For a hardware implementation, the processing units at the base station used to broadcast different types, can be implemented in one or several specific integrated circuits (ASICs), digital signal processors (DSPs), digital devices, signal processing (DSPDs), programmable logic devices (PLDs), programmable blower adjust the different arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, other electronic devices, designed to perform the functions described here, or their combination. The processing units in the wireless device used for receiving transmission of various types, can also be implemented using one or more ASICs, DSPs, and so on.

For the software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on)that perform the functions described here. Software code may be stored in the memory block (e.g., blocks 1042 and 1092 memory Figure 10) and executed by a processor (for example, the controller 1040 or 1090). The memory blocks can be implemented within the processor or may be external to the processor, in this case, they may be operatively connected with the processor via various means known in the art.

Headers are included here for reference and assistance in finding specific sections. These headings are not intended to limit the scope of the concepts described under these headings, and these concepts may have applicability in other sections throughout the specification.

The above description of the disclosed implementations is presented to the specialist in the art will be able from which otavite or use the present invention. Various modifications to these implementations will be obvious to a person skilled in the art, and the core principles specified in this description can be applied to other implementations without going beyond the scope and essence of the invention. Thus, the present invention is not intended to limit the implementations, but is consistent with the widest scope consistent with the principles and new features disclosed here.

1. The method of data transmission in wireless broadcast networks, the method includes the steps are:

process data for the global transmission in accordance with the first modulation scheme and coding;

process data for the local transmission in accordance with the second modulation scheme and coding;

while the first and second coding scheme and modulation are selected based on the desired coverage for global and local transmission, respectively;

multiplexer data for global transmission in the first transmission interval, the global transmission sent from multiple transmitters in the network;

multiplexer data for the local transmission in the second transmission interval, the local transmission is being sent from a subset of the set of transmitters in the network; and

in articulating the local and the global is th transmission over a wireless communication channel.

2. The method according to claim 1, in which the various local transmission being sent from different subsets of transmitters.

3. The method according to claim 1, in which the various global transmission sent from different sets of transmitters.

4. The method according to claim 1, further comprising a stage on which:

multiplexer data for the local transmission in the third interval transmission, local transmission is sent from smaller subsets of subsets of transmitters.

5. The method according to claim 1, in which the data for the global transmission of multiplexed time division (TDM) with the data for the local transmission, and where the first and second transmission interval are first and second temporal segment, respectively, of the frame of a predefined length.

6. The method according to claim 1, in which the data for the global transmission of the multiplexed frequency division (FDM) with the data for the local transmission, and where the first and second transmission interval are first and second set of frequency sub-bands, respectively, obtained by frequency modulation.

7. The method according to claim 1, wherein the wireless broadcast network uses multiplexing orthogonal frequency division signals (OFDM).

8. The method according to claim 7, in which the data for the global transmission of multiplexed with the time divided the eat (TDM) with the data for the local transmission, where the first transmission interval includes all frequency subbands usable for data transmission in the first time segment or frame, and where the second transmission interval includes all frequency subbands usable for data transmission in the second time segment of the frame.

9. The method according to claim 8, in which the data for the local transmission are multiplexed in less than all suitable frequency sub-bands, the number to reduce interference.

10. The method according to claim 9, in which the data for the local transmission from a subset of the multiple transmitters are multiplexed in the frequency sub-bands that are orthogonal frequency sub-bands used by at least one other subset of the multiple transmitters.

11. The method according to claim 9, in which the data for the local transmission are multiplexed in the frequency sub-bands, the selected pseudo-random manner from all suitable frequency sub-bands.

12. The method according to claim 1, wherein the second coding scheme and modulation has a lower spectral efficiency than the first coding scheme and modulation to increase coverage for the local transmission.

13. The method according to claim 1, wherein the first coding scheme and the modulation has a lower spectral efficiency compared with the second coding scheme and modulation.

14. The way is about to claim 1, which also includes a stage on which:

process data for global and local transmission based on the transmission, which sent the data and the data type.

15. The method according to claim 1, which also includes the steps are:

multiplexers first control signal in the third transmission interval, the first control signal suitable for receiving the first channel estimation for global transmission; and

multiplexer second control signal during the fourth interval of transmission of the second control signal suitable for receiving the second channel estimation for the local transmission.

16. The method according to item 15, in which the first and second control signals are multiplexed in different sets of frequency subbands in different symbol periods.

17. The method according to claim 8, which also includes the steps are:

multiplexers first control signal in different sets of frequency subbands used for transmission of the control signal in various symbol periods of the first time segment, the first control signal suitable for receiving the first channel estimation for global transmission;

multiplexer second control signal in different sets of frequency subbands used for transmission of the control signal in various symbol the s period of the second time segment, the second control signal suitable for receiving the second channel estimation for the local transmission.

18. The method according to clause 15, which also includes the stage at which: (I) generating a second control signal using an orthogonal sequence assigned to the subset of the multiple transmitters, where the second control signal for subsets of orthogonal transmitters, at least another second control signal to at least one other subset of the multiple transmitters.

19. The method according to clause 15, which also includes the stage at which: (I) generating a second control signal using a pseudo-random sequence assigned to the subset of the multiple transmitters, where the second control signal for a subset of the multiple transmitters, pseudo-random, at least with respect to the other second control signal to at least one other subset of the multiple transmitters.

20. The method according to claim 1, which also includes the steps are:

multiply the modulation symbols for the different frequency sub-bands on a pseudo-random sequence assigned to the subset of the multiple transmitters to obtain scaled symbols, where the pseudorandom sequence is used for each si the free period;

and multiply scaled symbols for different symbol periods on orthogonal sequence assigned to the subset of the set of transmitters to generate a second control signal, where the second control signal is a pseudo-random frequency and orthogonal in time with respect to at least one other second control signal to at least one other subset of the multiple transmitters.

21. The method according to claim 1, which also includes the steps are:

multiplexers additional service information for the global transmission in the third transmission interval; and

multiplexers additional service information for the local transmission in fourth transmission interval.

22. The method according to item 21, in which the additional service information for the global transmission denotes the time-frequency location of each data channel for the global transmission, and where additional service information for the local transmission denotes the time-frequency location of each of the channel data for the local transmission.

23. The method according to claim 1, which includes a stage on which:

choose the first and the second transmission interval based on the amount of data that must be broadcast for the global transmission and quantities of the data, which must be broadcast for the local transmission.

24. The method according to claim 1, which includes a stage on which:

adjust the first and second transmission interval based on the time of day.

25. The method according to claim 1, which includes a stage on which:

adjust the first and second transmission interval based on a predefined schedule.

26. Device for broadcasting data in a wireless broadcast network, comprising:

a multiplexer capable of receiving and multiplexing the data for the global transmission in the first transmission interval and to receive and multiplex the data for the local transmission in the second transmission interval,

the first data processor capable of processing data for global transmission in accordance with the first modulation scheme and coding

the second data processor capable of processing data for the local transmission in accordance with the second modulation scheme and coding

the transmitter can broadcast local and global transmission over a wireless communication channel,

the global transmission sent from multiple transmitters in the network, and the local transmission is being sent from a subset of the set of transmitters in the network.

27. The device according to p in which wireless shirokoveschatel the I network uses multiplexing orthogonal frequency division signals (OFDM), where data for the global transmission of multiplexed time division (TDM) with the data for the local transmission, the first transmission interval includes all frequency subbands usable for data transmission in the first time segment or frame, and the second transmission interval includes all frequency subbands usable for data transmission in the second time segment or frame.

28. The device according to p in which the first data processor is also capable of generating the first control signal, suitable for receiving the first channel estimation for global transmission, the second data processor is also capable of generating the second control signal, suitable for receiving the second channel estimation for the local transmission, and a multiplexer capable of multiplexing a first control signal in the third transmission interval and for multiplexing the second control signal during the fourth interval of the transmission.

29. The device according to p, in which the multiplexer capable of multiplexing additional service information for the global transmission in the third transmission interval and for multiplexing additional service information for the local transmission in fourth transmission interval.

30. The device according to p, which also contains:

the controller is capable of is the " first and second transmission intervals based on the number of broadcast data for the global transmission and the number of broadcast data for the local transmission.

31. A device for receiving data in a wireless broadcast network, comprising:

means for processing data for global transmission in accordance with the first modulation scheme and coding, and the processed data for the global multiplexed transmission in the first transmission interval;

means for processing data for the local transmission in accordance with the second modulation scheme and coding, and the processed data for the local transmission are multiplexed with the second transmission interval;

means for multiplexing data for global transmission in the first transmission interval, the global transmission sent from multiple transmitters in the network;

means for multiplexing data for a local transmission in the second transmission interval, the local transmission is being sent from a subset of the set of transmitters in the network; and

means for broadcasting local and global transmissions over a wireless communication channel.

32. The device according to p, in which the wireless broadcast network uses multiplexing orthogonal frequency division signals (OFDM), while data for the global transmission of multiplexed time division (TDM) with the data for the local transmission, the first transmission interval contains all the parts for totie sub-bands, suitable for data transmission in the first time segment or frame, and the second transmission interval includes all frequency subbands usable for data transmission in the second time segment of the frame.

33. The device according to p, which also contains:

means for multiplexing a first control signal in the third transmission interval, the first control signal suitable for receiving the first channel estimation for global transmission; and

means for multiplexing the second control signal during the fourth interval of transmission of the second control signal suitable for receiving the second channel estimation for the local transmission.

34. The device according to p, which also contains:

means for multiplexing the additional service information for the global transmission in the third transmission interval; and

means for multiplexing the additional service information for the local transmission in fourth transmission interval.

35. The device according to p, which also contains:

means for selecting first and second transmission interval based on the number of broadcast data for the global transmission and the number of broadcast data for the local transmission.

36. The method of receiving data in a wireless broadcast network, comprising the taps, on which:

take wirelessly broadcast, consisting of global distribution and local transmission, global transmission sent from multiple transmitters in the network, and the local transmission sent from a subset of the set of transmitters in the network;

if adopted the global transfer, process data for the global transmission in accordance with the first scheme demodulation and decoding; and

if accepted by the local transmission, the process data for the local transmission in accordance with the second scheme demodulation and decoding;

if adopted the global transfer, demultiplexing data for the global transmission of the first transmission interval; and

if accepted by the local transmission, demultiplexing data for the local transmission from the second transmission interval.

37. The method according to p in which the data for the global transmission of the multiplexed frequency division (FDM) with the data for the local transmission, and the first and second transmission interval are first and second set of frequency sub-bands, respectively, obtained by frequency modulation.

38. The method according to p in which the data for the global transmission of multiplexed time division (TDM) with the data for the local transmission, and the ri first and second transmission interval are first and second temporal segment, respectively, of the frame.

39. The method according to 38, in which the first time segment for global transfer precedes the second time segment for local transmission.

40. The method according to p, in which the wireless network uses multiplexing orthogonal frequency division signals (OFDM).

41. The method according to p in which the data for the global transmission of multiplexed time division (TDM) with the data for the local transmission, the first transmission interval includes all frequency subbands usable for data transmission in the first time segment or frame, and the second transmission interval includes all frequency subbands usable for data transmission in the second time segment of the frame.

42. The method according to p, which also includes the steps are:

if adopted the global transfer, demultiplexers additional service information for the global transmission of the third transmission interval; and

if accepted by the local transmission, demultiplexers additional service information for the local transmission from the fourth transmission interval.

43. The method according to 42, in which the additional service information for the global transmission denotes the time-frequency location of each data channel for the global transmission, and when e is om for more service information for the local transmission denotes the time-frequency location of each of the channel data for the local transmission.

44. The method according to p, which also includes the steps are:

if adopted the global transmission,

demultiplexers first control signal from the third transmission interval,

get a first estimate of the channel for the global transmission based on the first control signal, and

process data for the global transmission with the first estimate of the channel.

45. The method according to item 44, which also includes the steps are:

if accepted by the local transmission,

demultiplexer second control signal from the fourth transmission interval,

receive a second evaluation channel for local transmission based on the second control signal, and

process data for the local transmission from the second estimate of the channel.

46. The method according to item 45, in which the first and second channel estimation, respectively, associated with the first and second estimated impulse response having a different length.

47. The method according to p, which also includes the steps are:

perform the clipping threshold to reset the branch channel for the first estimation of an impulse response, which is below the first predetermined threshold; and

perform the clipping threshold to reset the branch channel for the second evaluation pulse response, which is below the second predupredile the threshold.

48. The method according to p, in which the first predetermined threshold is equal to the second predefined threshold.

49. The method according to item 45, which also includes the steps are:

if the received global transfer, process the first control signal to the first set of at least one temporal filter to obtain a first channel estimation; and

if the received local transfer, process the second control signal to the first set of at least one temporal filter to obtain a second estimate of the channel.

50. The method according to 49, in which the first and second set of at least one temporal filter have different lengths, different factors or different lengths and different factors.

51. A device for receiving data in a wireless broadcast network, comprising:

the reception unit capable of receiving wirelessly broadcast, consisting of global distribution and local transmission, global transmission sent from multiple transmitters in the network, and the local transmission sent from a subset of the set of transmitters in the network;

a data processor capable of processing data for global transmission in accordance with the first scheme demodulation and decoding, if adopted global transmission and sposobnastyami data for the local transmission in accordance with the second scheme demodulation and decoding, if accepted by the local program; and

the demultiplexer able to demultiplex the data for the global transmission of the first transmission interval, if adopted global transfer, and is able to demultiplex the data for the local transmission from a second transmission interval, if accepted by the local transfer.

52. The device according to 51, in which the wireless network uses multiplexing orthogonal frequency division signals (OFDM), and data for the global transmission of multiplexed time division (TDM) with the data for the local transmission, the first transmission interval includes all frequency subbands usable for data transmission in the first time segment or frame, and the second transmission interval includes all frequency subbands usable for data transmission in the second time segment of the frame.

53. The device according to 51, in which the demultiplexer is also able to demultiplex additional service information for the global transmission of the third transmission interval, if adopted global transfer, and is able to demultiplex additional service information for the local transmission from the fourth transmission interval, if adopted global transfer.

54. The device according to 51, which also contains:

the appraiser Kahn is La, able to derive a first estimation of the channel for the global transmission based on the first control signal, demultiplexing from the third transmission interval, if adopted global transfer, and is able to bring the second evaluation channel for local transmission based on the second control signal, demultiplexing from the fourth transmission interval, if adopted local transfer.

55. The device according to 51, in which the reception unit capable of receiving the global transmission and local transmission simultaneously on the same radio frequency.

56. A device for receiving data in a wireless broadcast network, comprising:

means for receiving wirelessly broadcast, consisting of global distribution and local transmission, global transmission sent from multiple transmitters in the network, and the local transmission sent from a subset of the set of transmitters in the network;

means for processing data for global transmission in accordance with the first scheme demodulation and decoding, if adopted global transfer;

means for processing data for the local transmission in accordance with the second scheme demodulation and decoding, if accepted by the local program; and

tool for demuxing data for CH the ball transmission from the first transmission interval, if adopted the global transmission; and means for demuxing data for the local transmission from a second transmission interval, if accepted by the local transfer.

57. The device according to p, in which the wireless network uses multiplexing orthogonal frequency division signals (OFDM), and data for the global transmission of multiplexed time division (TDM) with the data for the local transmission, the first transmission interval includes all frequency subbands usable for data transmission in the first time segment or frame, and the second transmission interval includes all frequency subbands usable for data transmission in the second time segment of the frame.

58. The device according to p, which also contains:

tool for demuxing additional service information for the global transmission of the third transmission interval, if adopted global transfer; and

tool for demuxing additional service information for the local transmission from the fourth transmission interval, if accepted by the local transfer.

59. The device according to p, which also contains:

tool for demuxing of the first control signal from the third transmission interval, if adopted global transfer;

cf is the rotary for demuxing the second control signal from the fourth transmission interval, if accepted by the local program;

means for receiving first channel estimation for global transmission based on the first control signal, if adopted global transfer;

means for receiving a second channel estimation for local transmission based on the second control signal, if accepted by the local program;

means for processing data for global transmission with the first estimate of the channel, if adopted global transfer;

means for processing data for the local transmission from the second estimate of the channel, if accepted by the local transfer.



 

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