Deep paging method

FIELD: communication systems.

SUBSTANCE: method includes forming paging channel message combined with Walsh series with length not less than 2m, which is then sent at data transfer speed below 480 bits per second. By transmitting message of paging channel at low data transfer speed and integration of gathered energy message can penetrate into buildings and other structures or environments with high level of fading.

EFFECT: higher efficiency.

4 cl, 6 dwg

 

The present invention mainly relates to the subject of satellite and other communication systems, to large losses on the tract, and more specifically to a method of providing paging signals, called deep paging, which ensures the reception of paging signals in the presence of damping high level.

Standard communication system based on satellite communication, contain gateways, user terminals and one or more satellites for transmission of communication signals between the gateways and user terminals. The gateway is a ground station having an antenna for transmitting signals to the satellites and receiving signals from the satellites. The gateway maintains lines of communication that uses satellites to connect the user terminal to other user terminals or users of other communication systems, such as the public switched telephone network of General use. The user terminal is a radio communications device, such as a cellular or satellite telephone, a data transceiver and a pager receiver, but is not limited to this. The user terminal may be stationary, portable, or movable, such as a mobile phone. The satellite is orbiting receiver, repeater or regenerator used to transmit information.

The satellite can receive signals on the terminal user and pass signals in the case if the user terminal is within the coverage area of the satellite. The service area of the satellite is a geographical region on the Earth's surface, within the range of the satellite signals. Usually, the service area through the use of antennas forming rays, is geographically divided into "rays". Each beam covers a specific geographic region within the service area. Beams can be directed in such a way that more than one beam from one satellite to cover one specific geographic region.

Some satellite communication systems use signals with spread spectrum multiple access code division multiplexing (mdcr), as described in U.S. patent No. 4901307, dated February 13, 1990, called "communication System multiple access spread spectrum using satellite or terrestrial repeaters", and in U.S. patent No. 5691974, 25 November 1997, called "Method and apparatus for use transmit power full spectrum communications system spread spectrum for tracking energy and phase time of the individual recipient".

In satellite communication systems using mdcr, for transmission to the gateway and from the gateway of communication signals, such as data or a graph, using a separate line. Specifically, the communication signals, outbound is e of the gateway, transmitted to a user terminal through a "straight line", while the communication signals originating from the user terminal is transmitted to the gateway through the "back line".

In the direct line of communication information from the gateway to the user terminal is transmitted through one or more beams. These rays often contain a number of so-called polucha (also called channels multiple access frequency division multiple access (FDMA equipment), or, in the case of extended spectrum, channels mdcr), covering a total geographical area, with each enjoys an excellent band. More specifically, in the standard system, spread spectrum communications to modulate or "extensions" signals the user information over a given bandwidth using one or more predefined pseudo-random noise (PN) code sequence prior to modulation to the signal carrier for transmission, as communication signals. PSH extension is known in the art for transmission of extension of the signal spectrum and generates a communication signal with a bandwidth much greater bandwidth of the data signal. In a straight line to distinguish between signals transmitted by different gateways, or through different rays, as well as to distinguish between signals of multipath propagation and the use of PN codes extensions or binary sequence. Often these codes are shared among all signals in this polluce.

In the standard system connection mdcr spread spectrum in a straight line due to the formation of many channels inside podlech satellite codes are used "channeling". Codes of canalisation are unique orthogonal "covering" codes, or unique orthogonal codes "channeling", which generate orthogonal channels in polluce through which the transmitted communication signals. For the implementation of codes of canalisation channels mainly use Walsh functions, also known as Walsh codes or Walsh sequence, and create what is known as the Walsh channels. The usual length of the orthogonal code is 64 item code signal for terrestrial communication systems and 128 elements signal code for satellite communication systems.

Most of orthogonal channels is the TV schedule for the exchange of messages between the user terminal and the gateway. The remaining channels often include a transmission channel pilot signal, the channel synchronization and one or more paging channels. Transmitted by channel graphics signals are usually intended for reception by one user terminal, although messages can also be sent to many users. Naproti is, monitoring paging channel and synchronization channel transmitting the pilot signal is typically carried out by many terminal users.

When the user terminal is not involved in the communication session (i.e., the user terminal cannot receive or send signals traffic), the gateway may transmit to the user terminal information by transmitting to the user terminal is a personal call. Personal call, which is usually short message transmitted by the above-mentioned paging channel. Often personal calls are passed to the gateway to establish lines of communication with the user terminal to notify the terminal of the user that has the call to reply to the terminal of a user attempting the attempted access to the communication system, and for the registration of the user terminal. Personal calls are also used for distribution to users ' terminals assignment of traffic channels and the additional service information. Transmitted on the paging channel personal calls typically have a data transfer rate of the order of 9600 or 4800 bits per second.

Unfortunately, usually, the user terminal when receiving direct personal challenges facing problems when it is inside a building or when there is some structure or other obstacle located is connected between the user terminal and the satellite (for example, wood, geological object or building). In this situation, the user terminal may not take a personal call, a paging message or a paging signal as a personal call may not enter the building or other material object due to loss of signal when passing, when he passes through the structure. The obvious solution to overcome the losses in the signal is to increase the capacity of the paging channel. The problem with this approach is that in order to overcome this attenuation, or shading, the power of the paging channel should be significantly increased. Basically, this requires increasing the power of the signal to such a level that the surrounding area will be exceeded by the value of the flux density of energy (PES). That is, the state license restrictions and technical limitations define limit values for the permitted values of the density of energy flow, which can have satellite signals over a given area geographic region. Increase capacity to ensure a successful personal call blocked or interference with the user terminal leads to more than the permitted density of energy flow (PES) in the surrounding area.

Thus, we need a method that can provide t is, what will be called "deep paging" without increasing the capacity of the paging signal. Deep paging is the ability to conduct personal call of a user terminal in an environment in which you want to overcome excessive loss when a signal higher losses than occur normally, components are usually about 20 or 30 dB. This environment includes the situation in which the user terminal is located deep inside a building or structure or partial obstruction.

The present invention provides a method of paging deep penetration, or penetration of a high level, which does not require increasing the capacity of the paging signal. According to one aspect of the invention provides a method of deep paging, namely, that form the message paging channel, cover or modulate the message paging channel a sequence of orthogonal codes, preferably coded by the Walsh sequence having a length of at least 2m elements of the code signal, where m is the length of the code sequences, typically used for forming channels of traffic, and transmit the modulated message paging channel with a data rate lower 4800 bits per second (bps). Message paging channel is in the transmission at a low data rate is able to penetrate buildings and other structures, thus ensuring a successful personal call of the user terminal located inside the building. Preferably the message paging channel is covered with a Walsh sequence of length 65536, the data rate is less than 10 bps, and the sequence of Walsh is an auxiliary Walsh sequence.

The invention also provides a method of deep paging in a communication system mdcr, in which multiple orthogonal sequences or code of Walsh sequences are used to form multiple orthogonal channels. The method consists in the fact that we create at least one auxiliary Walsh sequence from one sequence from a set of Walsh sequences, form the message paging channel, cover or analiziruyut channel message paging channel using auxiliary Walsh sequence, extend channeled into the channel message paging channel, and transmit the extended message paging channel data rate, the smaller 4800 bit/s Auxiliary Walsh sequence has a length not less than 128 elements of the signal, but preferably the length of the auxiliary Walsh sequence is 65536 elements of the signal. Additionally, also preferable is, to the data transfer rate was less than 10 bits/sec. Primarily according to the method further creates a second auxiliary Walsh sequence from one sequence from a set of Walsh sequences and cover or modulate the synchronization signal of the second auxiliary Walsh sequence to create an auxiliary channel synchronization. Additional auxiliary Walsh sequence can be generated from a single sequence or multiple sequences of Walsh and may be used to cover, or modulation, additional pilot signals, synchronization signals, or paging signals.

The invention also provides a method of compensation of the Doppler effect in the communication system in which messages are transmitted to a low data rate to a user terminal located inside the building or with other obstacles. The method consists in the fact that capture the user terminal to the pilot signal to bring it into the building, set the user terminal in the mode of deep paging after the capture of the user terminal to the pilot signal, move into the building with the user terminal, monitor Doppler shift part when the user terminal in the building, enter the mode longer integration with the persecuted and monitor auxiliary paging channel after activate deep paging. Message paging channel transmitted through the auxiliary paging channel, modulate the Walsh sequence having a length of at least 2m elements of the signal, where m is the length of the code used for normal modulation traffic channels, and transmit data rate, the smaller 4800 bit/s, Preferably messages paging channel transmitted by the auxiliary paging channel is formed using Walsh sequence having a length of about 65536, and transmit data rate of 10 bps or less.

The invention also provides an alternative method of compensation of the Doppler effect in the communication system in which messages are passed on to the low speed of data transmission to the user terminal located inside the building or with other obstacles. An alternative way is that accept messages ephemeris transmitted from the gateway to the user terminal, is stored in the user terminal message ephemeris or the data, determine the location of the user terminal, determine the Doppler frequency shift based on the location of the user terminal and message ephemeris stored in the user terminal, and capture the pilot signal. In the first embodiment, p and determining the location of the user terminal to store the location of the user terminal every time when the user terminal is registered with the gateway, and determine the current location of the user terminal based on the location of the user terminal at the time of the last registration of the user terminal to the gateway. In the second embodiment, when determining the location of the user terminal to receive signals from a global positioning system (GPS) or other system that determines the location of the position, and determine the location of the user terminal based on the signal SSE.

Additional characteristics and advantages of the present invention, as well as the function and structure of various embodiments of the present invention, described in detail below with reference to the accompanying drawings.

The accompanying drawings, forming part of the description, illustrate the present invention and together with the description additionally serve to explain the principles of the invention, as well as provide experts in the field of technology the ability to make and use the invention. In the drawings similar reference positions indicate identical or functionally similar elements. Additionally, the leftmost character(s) reference position defines the drawing, in which this reference position appeared for the first time.

Figure 1 illustrates a possible variant of systemizations, which may be applicable to the present invention.

Figure 2 illustrates a possible variant of a transceiver for use in a user terminal.

Figure 3 illustrates a possible variant of the device transceiver for use in the gateway.

Figure 4 illustrates a possible line of communication between the gateway and the user terminal.

Figure 5 illustrates a possible variant podlech.

6 illustrates podlech according to one variant embodiment of the invention.

Detailed description of preferred embodiments of the invention

I. Introduction

The present invention is particularly suited for use in communication systems using low earth orbiting satellites (NOSE), in which the satellites are not stationary relative to the point on the Earth's surface. However, the invention is also applicable to communication systems not low-orbit satellites or communication systems, in which the relay device or the users have a high speed relative to each other. The invention is also applicable to satellite communication systems that have relatively high or significant loss in the signal that occur between the transmitter and the receiver.

Below is described the preferred embodiment of the invention. Although described specific about what erali, configuration and devices, it should be noted that this is done only for illustrative purposes. Preferably used in Radiocommunication systems mdcr spread spectrum.

II. A possible variant of the satellite communications system

A. a Brief overview of the

Possible radio system, which can be used in the present invention, is illustrated in figure 1. It is assumed that the communication system uses the communication signals type mdcr that does not require strictly in accordance with the present invention, while to create a unique channel for paging uses orthogonal codes. In the illustrated figure 1 part of the system 100 as shown by the two satellites 116 and 118 and two gateway, or hub, 120 and 122 to communicate with two remote terminals 124 and 126 users. The total number of gateways and satellites in such communication systems depends on the required bandwidth of the communication system and other factors evident in this technical field.

Each of the terminals 124 and 126 users includes a radio communications device such as a phone, but is not limited to, a data transceiver, or receiver determine paging or position, and, if required, can be portable or installed on a vehicle. Figure 1 is a terminal 124 of the user is illustrated as a device, have been fitted the e on the vehicle, the terminal 126 of the user is illustrated as a mobile phone. However, it is also clear that the invention is applicable to stationary devices that require remote radiologiya. The terminal user, depending on preferences, in some communication systems, sometimes also referred to as subscriber devices, mobile stations, mobile devices, or simply "users" or "subscribers".

Basically, the rays from the satellites 116 and 118 cover different geographic areas specified in the chart orientation. Rays of different frequencies, also called channels FDMA equipment or "podrukami", can be directed to overlap the same area. For specialists in this field of technology is also clear that the beam coverage or service areas for many satellites could be designed for full or partial overlap in this region depending on the project communication system and the type of service offered and depending on that, is there space diversity.

For servicing a large number of user terminals has been proposed a number of multi-satellite communication systems with the option of a communication system that uses the order of 48 or more satellites moving in eight different orbital planes of the orbits on the NOSE. However, for the special is of alistov in the art will understand, as the present invention is used for a number of satellite systems and configurations gateways, including other orbital distance and grouping.

According to figure 1 illustrates some possible paths of signals for communication between terminals 124 and 126 users and gateways 120 and 122 via satellites 116 and 118. Lines of communication satellite - user terminal between satellites 116 and 118 and the terminals 124 and 126 users are illustrated by lines 140, 142 and 144. Lines of communication the gateway - satellite between the gateways 120 and 122 and satellites 116 and 118 are illustrated by lines 146, 148, 150 and 152. Gateways 120 and 122 can be used as part of systems with unilateral or bilateral communication or simply send messages or data to the terminals 124 and 126 users.

Century variant of the transceiver of the user terminal.

Figure 2 illustrates a possible variant of the transceiver 200 for use in terminals 124 and 126 users. The transceiver 200 uses at least one antenna 210 for receiving communication signals transmitted to the analog receiver 214, where they transform with decreasing frequency, amplify and digitize. Often used element 212 antenna switch for one antenna of the functions of transmission and reception. However, some systems use a separate antenna for operation at different often the Oh transmission and reception.

Digital communication signals at the output of the analog receiver 214 is transmitted to at least one receiver A digital data signals and at least one receiver 218 search device. For specialists in the art it is obvious that depending on the acceptable level of complexity of the transceiver to provide the required levels of diversity signals may be additional receivers V-216N digital data.

With receivers 216A-216N digital data signals and the receiver 218 search device connected to the at least one processor 220 controls the user terminal. The processor 220 management provides, among other functions, control of the main signal processing, synchronization, power and transmission services, or coordination, and the choice of frequencies used for carrying signals. The other main function of management is often performed by the processor 220 of the control is the selection or manipulation of pseudocumene (PN) code sequences, or orthogonal functions for use in the processing of the communication signal. The signal processing processor 220 controls may include determining the relative signal strength and calculating various related parameters of the signal. Such calculations of the parameters of the signal as sync and cha is toty, can include the use of additional or separate circuits to provide increased efficiency or speed measurements or improved resource allocation processing control.

The outputs of receivers 216A-216N digital data coupled with digital circuits 222 baseband frequencies inside the user terminal. Custom digital circuits 222 main frequency bands contain elements of processing and playback used to transmit information to the user of the user terminal and from him. That is, the storage elements of the signals or data, such as short-term or long-term digital memory; input and output data, such as display screens, speakers, terminal devices keyboard and handset; A/C items, vocoders and other elements of speech processing and analog signals; and the like, all parts of the forms used in custom digital circuits 222 main band of frequencies, known in the art. If you are processing an exploded signal, custom digital circuits 222 main frequency band may include a combiner explode and decoder. Some of these elements can also function under control of CPU 220 controls or being associated with it.

When speech sludge is other data prepared as an output message or communication signal, outbound from the user terminal, a custom digital circuit 222 main frequency bands used for receiving, storing, processing, and other preparation for transmission of the required data. Custom digital circuits 222 main band serves the data to the modulator 226 transfer, operates under control of CPU 220 controls. The output of the modulator 226 transfer are transferred to the controller 228 power input output power at the amplifier 230 power transmission for the final transfer of the signal output from the antenna 210 to the gateway.

The transceiver 200 may also use the element 232 preliminary correction of the transmission path to adjust the frequency of the outgoing signal. This can be accomplished using known methods of transformation with increasing frequency and conversion with decreasing frequency signal transmission. Alternatively, the element 232 preliminary correction may form part of the mechanism of frequency selection or management for operations (230) to analog conversion with increasing frequency and modulation of the user terminal so that is configured accordingly, the frequency used to convert the digital signal to the desired transmission frequency in a single operation.

The transceiver 200 may also use the W ith element 232 preliminary correction on the transmission path to adjust the timing of the outgoing signal. This can be accomplished using well-known methods of adding or releasing delay in signal transmission.

Digital receivers 216A-N and the receiver 218 search device configured with elements of the correlation signal for demodulation and tracking of specific signals. The receiver 218 search device to search for pilot signals or other relatively strong signal with a fixed pattern, while digital receivers 216A-N are used for demodulation of other signals corresponding to the detected pilot signals. However, after the capture of the tracking pilot signal can be assigned to the receiver 216 of the data signals to determine the exact ratio of signal to noise for the energies of the elements of the signal to determine the power of the pilot signal. Therefore, you may monitor the output of these devices for the determination of the energy or frequency of the pilot signal or other signals. These receivers also use elements of the monitoring frequency, monitoring which can be to supply current information on the frequency and timing for demodulating signals to the processor 220 of the control.

The processor 220 management uses this information to determine the degree of offset of the received signal relative to the frequency generator is ora, when scaled to the same corresponding range of frequencies. On demand this and other information about frequency error and Doppler shifts can be stored in the elements 236 storage or memory.

C. Possible variant of the transceiver gateway

Figure 3 illustrates a possible variant of the device 300 transceiver for use in gateways 120 and 122. Illustrated in figure 3 part of the gateway 120, 122 has one or more analog receivers 314, connected to an antenna 310, for receiving communication signals, which are then convert with decreasing frequency, amplify and digitize using various known in the art, circuits. In some communication systems use many of the antennas 310. Digital signals at the output of the analog receiver 314 serves as input signals at least one block of the digital receiver, indicated by the dotted lines with common reference position 324.

Each block 324 digital receiver corresponds to the elements of the signal processing used for controlling the communication between the gateway 120, 122 and one terminal 124, 126 user, although this technology is known for some of the options. One analog receiver 314 may submit input to many blocks 324 digital receiver and gateways 120, 122 is often used several of these modules is economical to adapt to the processing of all rays satellites and signals, perhaps it is explode at any given time. Each block 324 digital receiver has one or more receivers 316 digital data and the receiver 318 search device. The receiver 318 search device, in the main, search for the relevant modes explode signals other than the pilot signals. In communication systems, which carried out the implementation, for receiving diversity signals are used in many receivers 316-316N digital data.

The output signals of the receivers 316 digital data are fed to the elements 322 further processing of the basic frequency band containing devices known in the art and not illustrated in detail here. The variant of the device main band includes combiners explode and decoders for combining signals of multipath propagation in a single output signal for each user. The variant of the device main band also includes a circuit interface for supplying output data to the digital switch or network. A number of other known elements, such as vocoders, modems, data and digital switches and data storage components, but are not limited to, may form part of the elements 322 of the processing base band frequencies. These elements function to driven the I or the direction of transmission of data signals to one or more blocks 334 transfer.

Each of the signals for transmission to the user terminal is connected with one or more corresponding blocks 334 transfer. Default gateway uses several such blocks 334 transfer to allow for the simultaneous maintenance of many terminals 124, 126 users and for multiple satellites and beams simultaneously. The number of blocks 334 transmission used by the gateway 120, 122, is determined by well-known in the art factors, including the complexity of the system, the number of visible satellites, the bandwidth of the user, the selected degree explode, etc.

Each block 334 transmission contains a modulator 326 transmission, performing modulation data with the expansion of spectrum for transmission. Modulator 326 transmission has an output connected to the digital controller 328 transmit power that controls the transmit power used for the outgoing digital signal. Digital controller 328 power transmission uses the minimum power level to reduce interference and allocation of resources, but, when necessary, applies the appropriate power levels to compensate for the attenuation on the transmission path and other characteristics of the transmission path. When the extension signal modulator 326 transmission uses at least one PN generator 332. This code generation can also formatoutputvalue part of the one or more processors of the control or storage elements, used gateway 122, 124.

The output signal of the controller 328 transmit power is transmitted to the adder 336, where it is summed with the outputs of other blocks transmission. Such output signals are signals for transmission to other terminals 124, 126 users on the same frequency and within the same beam, and the output signal of the controller 328 transmit power. The output signal of the adder 336 is applied to the analog transmitter 338 for digital to analog conversion, conversion to the appropriate RF carrier frequency, amplification and goes to one or more antennas 340 for radiation to the terminals 124, 126 users. Antenna 310 and 340 may be the same antennas depending on the complexity and configuration of the system.

At least one processor 320 management gateway connected to the blocks 324 receiver, blocks 334 and transmission schemes 322 baseband frequencies; these devices physically can be separated from each other. The processor 320 of the control signals command and control to perform functions such as signal processing, signal synchronization, power control, transmission control service, and the combination of diversity and mating systems, but is not limited to this. Optionally, the processor 320 of the control assigns PN codes extensions, ortogonal the data code sequence and specific transmitters and receivers for use in communication of the user.

The processor 320 also controls the formation and power of the signal transmission channel pilot signals, signals of the sync channel and paging channel signals and their connection to the controller 328 transmit power. The transmission channel pilot signal is simply a signal that is not modulated with data, and can use the duplicate immutable template or constant type of structure frame (template), or the input tone type modulator 326 transmission. This means that the orthogonal function, Walsh code used for forming a channel for the pilot signal, generally has a constant value, for example, all of the unit 1, or zeros 0, or known repetitive pattern, such as a structured template perenesennyj units 1 and zeros 0. If, as is usually used by the Walsh code is a code of all zeros 0, this leads indeed to transfer PSH code extensions obtained from PN generator 332.

Although the processor 320 can be connected directly with the elements of the block, such as block 324 transfer, or block 334 reception, basically each block contains processor specific block, for example, the processor 330 of the transfer or the CPU 321 reception, managing the elements of this unit. Thus, according to figure 3 in the preferred embodiment, the processor 320 of the control connected with what recession 330 transmission and processor 321 reception. Thus, one processor 320 management can more effectively control the operation of a large number of units and resources. The processor 330 transmission controls the formation and strength of the signals: the pilot signals, synchronization signals, paging signals, signals of channel traffic and signals any of the other channels and their respective connection to the controller 328 power. The CPU 321 of the receiver controls the search extender PN codes for demodulation and monitoring the received power.

For some operations, such as management capacity of the shared resource, gateways 120 and 122 receive from the user terminals in the communication signals information, such as a power of a received signal, the measurement frequency or other parameters of the received signals. This information processors 321 admission can be obtained from the demodulated output signals of the receivers 316 data. Alternatively, this information may be detected as occurring at specified locations in the signals that are monitored by the processor 320 controls or processors 321 reception and transmitted to the processor 320 controls. The processor 320 management uses this information to control the timing and frequency of the signals transmitted and processed using controllers 328 m is snasti transmission and analog transmitter 338.

D. Possible lines of communication

Figure 4 illustrates additional details of the communication between the gateway 122 and the terminal 124 of the user of the system 100 of communication. The communication line between the terminal 124 of the user and the satellite 116 is typically referred to as user-defined lines of communication and lines of communication between the gateway 122 and the satellite 116 is typically referred to as feeder lines. In the "direct" direction of the link is carried out from the gateway 122 in a straight feeder line 460 connection, and then from the satellite 116 to the terminal 124 of the user down, straight custom line 462 connection. In the "inverse" or "reverse" direction of the link is carried out from the terminal 124 of the user to the satellite 116 on the opposite custom line 464 connection and then from the satellite 116 to the gateway 122 on the opposite feeder line 466 connection.

In a possible embodiment, the gateway 122 sends information on direct 460, 462 lines using frequency separation and polarization seal. The used frequency band is divided into a specified number of frequency "rays". For example, the frequency range is divided into 8 separate "rays" to 16.5 MHz, using right-circular polarization (PEP) and 8 separate "rays" to 16.5 MHz, using the left circular polarization (LCP). These frequency "rays" additionally consist of a specified number of frequency divided compacted "polucha" (the CR is). For example, the individual rays of 16.5 MHz may, in turn, consist of "polucha" CRU, up to 13 "polucha" with a bandwidth of 1.23 MHz.

That is Possible patterns podlech

Each podlech CRU may include many channels Walsh (also called orthogonal channels). Figure 5 illustrates a possible variant podlech 500, with sixty-four channel Walsh 502-508. As shown in figure 5, option podlech 500 includes a channel 502 transmitting the pilot signal, the channel 504 synchronization, seven paging channels 506 (1)to(7) and fifty five channels 508 (1)-(55) traffic, for a total of sixty-four orthogonal channel. For specialists in the art it is obvious that it can be used a different number of channels, for example less or more paging channels, or more or fewer of all channels. For example, some communication system develops a request for the use of codes having 128 elements of the signal code, or binary elements resulting in 128 orthogonal channels, which in the example below, will be denoted by Wi128.

The channel 502 transmit the pilot signal is used by the terminal 124 of the user, among other tasks, to capture podlech (carrier mdcr). Channel 504 synchronization includes a repeating sequence is lnost information which terminal 124 of the user may be considered after the capture channel 502 transmit the pilot signal. This repeating sequence information, as it is known, is used by the terminal 124 of the user to capture the initial time synchronization. When the terminal 124 of the user implemented the capture time synchronization, it adjusts its timing in accordance with the so-called normal synchronization system. Then the terminal 124 user defines and starts to monitor one or more assigned paging channel 506 for message paging channel transmitted from the gateway.

Message paging channel transmit information from the gateway to the user terminal. For explanations of the presented example, there are at least five main types of messages paging channel. These basic types of messages include: message, additional service information, paging messages, commands, messages, channel assignments and messages short message service (SCS). Additional service information are used for configuring the system. Paging messages are typically transmitted when the gateway receives the call or request for line connection with the user terminal and requires a response is received from the terminal user is La. Command messages are used to control specific user terminal by sending commands to the terminal. For example, the command message can be used to block or prevent the transmission of erroneous user terminal. Message destination channel allows the gateway to change the purpose of the paging channel for the terminal user and assign the user terminal to one of fifty five channels 508 traffic. In conclusion, messages SCS allow the gateway to send the user terminal short digital messages to provide information to the user, for example, by displaying for viewing on the screen. These messages are mainly used for visual paging messages as standard pagers to provide a brief statement about the state of the system or other information, including news, business and sports data. Send a message of this type is an important consideration in the decision to apply the regime of the deep paging.

Channel 508 traffic is assigned at the request of the communication line (for example, when a call is received). The exchange of messages between the user terminal and the gateway 122 in the continuation of a normal telephone call is made through the channel 508 traffic.

Typically, each channel 502 transmitting the pilot signal, can the l 504 synchronization up to seven paging channels 506, and fifty five channels 508 traffic generated, or generated using the set of unique orthogonal Walsh sequences, denoted by Wi64(where i is the index of the Walsh sequence, and 64 is the length of the sequence, in General, Wim). Specifically, the channel 502 transmit the pilot signal is typically formed using a sequence of Walsh WO64the channel synchronization can be formed using a sequence of Walsh W164, paging channels 506 (1) - 506 (7) can be formed using Walsh sequences W264-W864respectively, and the channels 508 (1) - 508 (55) traffic generated using Walsh sequences W964-W6364respectively. For specialists in the art it is obvious that this invention is also applicable for use with longer orthogonal codes, such as Wi128that lead to a greater number of channels, make available, and to sets of orthogonal binary codes, which are not strictly defined as a sequence of Walsh.

Each of the unique sequences of the Walsh W064-W 63 64is orthogonal relative to each other. For data transmission on a particular channel Walsh data are covered, or analiziruyutsya, that is combined with a Walsh sequence, or modulated using a Walsh sequence used in the formation of this particular channel Walsh. For example for the transfer of personal calling or paging information or data on the paging channel 506 (1), first personal call is covered, or analiziruetsya, using a sequence of Walsh W264. Similarly, for transmission of the traffic channel 508 (3) traffic first traffic must be covered by a sequence of Walsh WII64and so on for each respective channel. The channel 502 transmit the pilot signal is covered with a Walsh sequence W064that really provides no modulation.

III. The preferred embodiment of the invention

Below are described the preferred implementation of the present invention. Although described specific operation, configuration and devices, it is clear that this is done solely for explanatory purposes. For specialists in the art it is obvious that, without departing from the essence and scope of the present invention is not beyond its scope, you can use other operations, configuration, and device. The present invention may find application in a number of information systems and in some radio communication systems, including systems designed to determine the position.

As described above, the terminal user encounters problems when receiving messages, the paging channel when it is inside the building and away from the hole to the outside, such as a door or window, or when it is otherwise covered or surrounded by a structure or physical materials or objects, such as trees that block or cause attenuation of the signal. In such a situation typically occurs in a signal attenuation of at least 20 to 30 dB. One solution, already described, is simply to increase the power of one of the paging channels 506, for example, paging channel 506 (1) and the monitoring terminals users paging channel on a given basis. The problem with this approach is that power must be increased to such an extent that it will be exceeded within the PES, which is unacceptable.

The preferred solution is to reduce the data rate of one of the paging channels 506, for example paging channel 506 (1), from the standard data transfer rate (4800 bps or 9600 bps) to a very low IC is to grow the data (for example, 10 bps or less) while maintaining the standard power level. At the same time increasing the integration period used for the reception of such a paging signal, to provide for the collection of additional energy signal. This allows paging channel 506 (1) to successfully deliver several dozen messages paging channel per hour on the user terminal, the location of which is, for example, in building, in which there are excessive losses during the passage of the signal that must be overcome, are in the range from 20 to 30 dB. In addition, it allows you to use most of the power podlech 500 for channels 508 traffic.

However, the decision to use a very low data rate on one of the paging channels, for example paging channel 506 (1), requires the use of one of the orthogonal codes or one of the sequences of the Walsh assigned to this channel. To maintain system capacity and, in order not to lose the use of the paging channel for a limited number of users within the coverage areas of high attenuation, adopted a new approach using much longer orthogonal code than code that is typically used when forming the paging channel. As described above, the paging channel 506 (1) - 506 (7) and each of the output from other channels Walsh, formative podlech 500, usually formed from a set of Walsh sequences, each of which has a length m of sixty-four (64) of the signal elements or one hundred and twenty eight (128) of the signal elements. This length code sequence can be used for deep paging and code remains orthogonal with respect to the other channel codes, which can be used in some communication systems.

However, there is normally a need for or planning for dynamic expansion of many deep channels paging for use in service areas in which it is expected that a greater number of terminal users will be faced with increasing attenuation by forming many channels that are used to implement paging to this number of users. In such a situation or configuration when allocating resources code many channels should be used many codes out of a total number of 64 or 128 Walsh, or orthogonal codes used for channels, for example, to provide 5 channels deep paging should be used 5 codes. Ultimately, this loss affects the throughput of the system for other paging channels or traffic channels. But if for forming channels deep paging ISOE is with a lot of auxiliary codes Walsh, which all comes from the same "root" Walsh code, only one Walsh code (from 64 or 128, or another appropriate number used in the system) is used to provide deep channels paging, leaving a greater number of codes for use in the formation of the regular paging channels or traffic channels.

The proposed method has the advantage over the existing process of code generation and uses one of Walsh sequences, typically used in the formation of the paging channel, to create a much longer "support" the Walsh sequence, and then generates a paging channel 506 using this longer auxiliary Walsh sequence. For example, you can use the standard sequence of Walsh (W264), usually used for paging channel 506 (1)to create a much longer "support" the Walsh sequence, and then to form a new, or secondary, paging channel, using the longer auxiliary Walsh sequence.

For specialists in the art it is obvious that the sequence of Walsh, denoted by Wim(where i is the index of the Walsh sequence, a m is the length of the members is Telenesti Walsh) may be used to generate N other Walsh sequences, called sub-sequences, each of length N*m, where N is a power of 2 (i.e., N=2n, n is a nonnegative integer). Auxiliary Walsh sequence is a sequence of Walsh, built by the concatenation of WimN times, each concatenated Wimmay have a different polarity. The sequence of polarity must be selected to generate N additional orthogonal Walsh sequences of length N*m.

Take, for example, N = 4, Wimyou can build the following four auxiliary Walsh sequence of length 4*m:

Wheredenotes the logical complement of Wim=-Wimand Wi1=1.

Each of the N*m auxiliary sequences Walsh, formed of Wimis orthogonal to all other Walsh sequences of length m, in addition to the sequence of Walsh Wimand they are orthogonal to each other.

Therefore, the sequence of Walsh W264may be formed of N auxiliary Walsh sequences of length N*64. Additionally, all of the N in pologitelnui sequences Walsh, formed from the sequence of Walsh W264orthogonal to each other, and all channels, resulting in the use of these sequences will be orthogonal to the other channels, including channels formed with the other sequences, Walsh Wj64j≠2). Preferably, N is equal to 1024, which gives 1024 auxiliary Walsh sequence of length 65536 (1024*64=65536). Any of these 1024 auxiliary Walsh sequences can be generated, or generated from a code source used for paging channel, such as 506 (1). For specialists in the art it is obvious that N can be set to other values required, as may be selected and orthogonal codes with different length.

The formation of one of the 1024 auxiliary Walsh sequences of length 65536 from the sequence, otherwise used to generate the paging channel 506 (1), allows to reduce the data rate of paging channel 506 (1) of the standard data rate of 4800 bps or 9600 bps speed data transfer 10 bits/s or less when the "save" orthogonal codes (Walsh). Specifically, the use of a Walsh sequence of length 65536 for forming a paging channel 506 (1) allows paging to the Nala 506 (1) to support low data rate in 9,375 bits per second. This follows from the fact that each bit of data is transmitted over a longer period of time at a certain power level, and regimens signal is set to accumulate in the incoming signal more energy per bit. In the presence of damping this increases the possibility of successful correlation with the paging signal and demodulating the paging signal.

As described above, lowering the data transfer rate of paging channel 506 (1) to 10 bps or less, when using approximately the same magnitude of power that is typically used, allows paging channel 506 (1) to deliver messages paging channel to a user who is in the building in which excessive transmission losses that must be overcome, are in the range from 20 to 30 dB.

In addition to the Association one of the 1024 auxiliary sequences of the Walsh data used for paging channel 506 (1), one of the other 1024 auxiliary Walsh sequences can be used to create an auxiliary synchronal, or channel synchronization, in addition to the channel 502 transmit the pilot signal and the channel 504 synchronization. If the auxiliary channel synchronization is given the same power level as the channel 504 synchronization auxiliary channel synchronization can be overcome is the hoots 20-30 dB and thus, to penetrate through buildings and other obstacles. This provides the appropriate reference synchronization signal for use in the capture and demodulate deep paging. Also, if required, can be used not required auxiliary channel of transmission of the pilot signal. Here, one of the 1024 auxiliary Walsh sequences can be used to create an auxiliary transmission channel pilot signal in addition to the channel 502 transmit the pilot signal.

6 illustrates podlech 600, having a structure of a signal according to one variant of implementation of the present invention. Like pontocho 500 podlech 600 includes a channel 602 transmitting the pilot signal, the channel 604 synchronization, up to seven paging channels 606 (1)to(7), including auxiliary paging channel 606 (1), and fifty five channels 608 (1)-(55) traffic. Used to create an auxiliary paging channel 606 (1)or 606 (l1) orthogonal code (606 (1)), can also be used to create up to 1024 or more auxiliary orthogonal Walsh codes that can be used, if necessary, to create an auxiliary transmission channel pilot signal, additional auxiliary channel synchronization and many auxiliary paging channel. This Fig is exhibits 6, where podlech 600 includes auxiliary channel 603 transmitting the pilot signal, the auxiliary channel 605 synchronization and one or more auxiliary paging channel 606 (l1) to 606 (lN). As above, on demand, can be used longer and shorter orthogonal sequence in accordance with project-specific communication system, which leads, as is well known, different number of channels.

In one embodiment, the channel 602 transmit the pilot signal is formed or generated using Walsh sequence W064the channel 604 synchronization is generated using a sequence of Walsh W164, paging channels 606 (2)-606 (8) are formed using Walsh sequences W364-W864and channels 608 (1)-608 (55) traffic generated using Walsh sequences W964-W6364. In this embodiment, the auxiliary paging channel 606 (1)or 606 (l1), is formed using one of the 1024 auxiliary Walsh sequences of length 65536, formed as described above, the sequence of Walsh W264. Additionally, the auxiliary channel 605 synchronization creates or forms is by using another of 1024 auxiliary sequences Walsh, formed from the sequence of Walsh W264.

Preferably, the data transfer speed in the auxiliary paging channel 606 (1) set of 10 bps or less, as opposed to the standard data transfer rate of 4800 bit/s 9600 bit/s In this configuration, the data transmission on the secondary channel 605 synchronization and auxiliary paging channel 606 (1), can penetrate the structure (e.g. a building), where excessive transmission losses are in the range of 30 dB or less, due to increased energy collected at the bit for a longer time signal integration. Therefore, personal calls that are passed through the auxiliary paging channel 606 (1)or 606 (l1)may be received by the user terminal, regardless of whether the user terminal inside the building.

However, since satellites 116, 118 are not in geosynchronous Earth orbit, lowering the data transfer rate to the auxiliary paging channel 606(1) to 10 bps or less increases the Doppler effect. That is, the lower the data rate, the higher the impact of changes of Doppler shifts in the frequency and phase changes. Longer bits at lower frequencies means that the resulting change of the Doppler with the vig frequency and phase shift for each bit compared to higher frequencies. For example the change of Doppler frequency shift and phase shift due to the Doppler effect, which occurs for each (one) bit, when receiving a signal with 10 bits/s is 1000 times greater than when receiving the same signals from 10,000 bits/s This leads to the inability or at least to reduce the ability to receive the coherent signal, which is typically used in communication systems using the pilot signal. The magnitude of the Doppler frequency shift should be monitored or be compensated to ensure proper synchronization signals for correlation and tracking.

To compensate for the increasing influence of the Doppler effect at lower frequencies can be used several ways, and the following are two such ways. When using the first method actually takes place is less of a problem because the schema of a user terminal (TA) is effectively blocked from the Doppler effect before they begin to take on speed 10 bit/s But in the second proposed method, the TA is within a building or area of attenuation, and he must search for the pilot signal using a relatively long (duration as 1000X) integration time. Not having a pretty good view about what is the value of the Doppler frequency shift, TA unlikely n the fall or capture the pilot signal or the synchronization signal.

The first method requires the user terminal, while he is free, was included. Then, the user terminal is set in the "mode deep paging" before it will be submitted to the building, or has other obstacles. Installation of the user terminal in the mode of deep paging means that he will monitor the regular or auxiliary channel 603 transmitting the pilot signal, using increased integration period, or increased integration time, to monitor regular or auxiliary channel 605 synchronization and also to monitor the paging channel low speed data (auxiliary paging channel 606(1)). Preferably used integration time, of the order of 1000 times longer than usual (compared to the regular pilot signal, the paging signal, the signal traffic etc). When the user terminal is brought into the building, the user terminal automatically detects the Doppler frequency shift on the basis of the channel with a low data transfer rate, and thus, using a long integration time, can monitor at high attenuation on the path. Thus, the TA may receive the paging message on the paging channel of the low speed data transmission, while the attenuation does not exceed 30 dB. The only disadvantage of this method is that the user must not forget to use the mode of deep paging before, before entering the building, or the user terminal should automatically detect the signal and then automatically switch to deep paging.

The second method is usually more expensive, or uses to implement more elements of the schema than the first method, but does not require a user terminal in the mode of deep paging to bring it into a building or another area of strong damping. In fact, the second method works even when the user terminal is enabled when it is already inside the field attenuation, for example inside a building. The second method requires receiving and storage terminal user message ephemeris transmitted in the normal mode of the gateway. Receiving and storing messages ephemeris, the user terminal will know or can determine the expected Doppler frequency shifts for different satellites and their evolution in time.

To use the second method, the user terminal must also know your location. For the user terminal is usually enough to save the location when it registers with the gateway and use the last SOH is ananou position, if the new position is not available otherwise. Alternatively, the location of the user terminal can be determined if the user terminal is equipped with a receiver for the global positioning system (GPS), which can capture the SHG signals when inside the building. Then, the data of SHGs are used as the starting location. Knowledge of the location and receiving and storing messages ephemeris allows the user terminal to determine the Doppler frequency shift and to project future values. Thus, the second way allows you to enable the user terminal when it is inside the building and continue the capture channel 600 transmission of the pilot signal.

Although the above described various embodiments of the present invention, it should be clear that they were shown only as examples, but not limitations. Thus, the breadth and scope of the present invention should not be limited to any of the above-described possible embodiments, but is defined only in accordance with the claims and its equivalents.

1. How deep paging through a gateway message paging channel in a communication system in which communication channels form a set of orthogonal binary sequences of a given length is m, and the data transfer to the data transfer rate D bits per second, namely, that form at least one deep channel paging with additional orthogonal sequence of length Nm, where N is a positive integer, formed from one sequence of the above-mentioned set of orthogonal sequences by increasing the length of one sequence of the above-mentioned set of orthogonal sequences from m to Nm, and transmit the mentioned message paging channel on said paging channel at a data rate, a lower D bits per second.

2. The method according to claim 1, characterized in that the said orthogonal binary sequences and additional orthogonal sequences are Walsh sequences.

3. The method according to claim 2, characterized in that the said orthogonal binary sequences are Walsh sequences of length 64 or less, and said additional orthogonal binary sequence is an optional Walsh sequence having a length equal to or greater than 128.

4. The method according to claim 2, characterized in that the said orthogonal binary sequences are Walsh sequences of length 128 or less, and said additional ortho is separated binary sequence is an optional sequence of Walsh, having a length of not less than 256.

5. The method according to claim 3, characterized in that said additional sequence of Walsh has a length of 65536 elements of the signal.

6. The method according to claim 3, characterized in that said additional sequence of Walsh is an auxiliary Walsh sequence.

7. The method according to claim 1, characterized in that the data transmission rate is less than 10 bits per second.

8. The method according to claim 1, characterized in that it further generate at least a second auxiliary orthogonal sequence from one sequence of the above-mentioned set of orthogonal sequences by increasing the length of one sequence of the above-mentioned set of orthogonal sequences.

9. The method according to claim 8, characterized in that it further integrate information channel synchronization with the second auxiliary orthogonal sequence, thereby creating an auxiliary channel synchronization.

10. The method according to claim 1, characterized in that additionally create additional channels deep paging with additional orthogonal sequences of length Nm, where N is a positive integer, formed from one sequence of the above-mentioned set of orthogonal sequences by increasing the lengths of the one sequence of the above-mentioned set of orthogonal sequences.

11. The method according to claim 1, characterized in that additionally create additional channels deep paging with additional orthogonal sequences of length Nm, where N is a positive integer that is generated from other sequences of the above-mentioned set of orthogonal sequences by increasing the length of the other sequences of the above-mentioned set of orthogonal sequences.

12. How deep paging through a gateway message paging channel in the communication system, multiple access, code-division multiplexing (mdcr), in which multiple orthogonal channels are used by many of Walsh sequences, namely, that create at least one auxiliary Walsh sequence from one sequence to the aforementioned set of Walsh sequences by increasing the length of one sequence of the above-mentioned set of Walsh sequences, form a paging channel with auxiliary Walsh sequence and the said message paging channel and transmit the mentioned message paging channel through the mentioned paging channel data rate is less than 4800 bits per second.

13. The method according to item 12, characterized in that mentioned the I auxiliary Walsh sequence has a length not less than 128.

14. The method according to item 12, characterized in that the said auxiliary Walsh sequence has a length of 65536 elements of the signal.

15. The method according to item 12, wherein the data rate is less than 10 bits per second.

16. The method according to item 12, characterized in that it further generate at least a second auxiliary Walsh sequence from one sequence to the aforementioned set of Walsh sequences by increasing the length of one sequence of the above-mentioned set of Walsh sequences.

17. The method according to item 16, characterized in that it further integrate information channel synchronization with the second auxiliary Walsh sequence, thereby creating an auxiliary channel synchronization.

18. The method according to item 16, characterized in that additionally create additional auxiliary Walsh sequence from one sequence to the aforementioned set of Walsh sequences by increasing the length of one sequence of the above-mentioned set of Walsh sequences and form additional channels deep paging using complementary sequences of Walsh.

19. The compensation of the Doppler effect in the communication system in which messages are passed to the low-speed transmission and data to the user terminal, inside the building, namely, that capture the pilot signal before making user terminal building, install the user terminal in the mode of deep paging before making user terminal in the building, track Doppler frequency shift when the user terminal inside the building and monitor auxiliary paging channel after activate deep paging.

20. The method according to claim 19, characterized in that the messages paging channel transmitted through the mentioned auxiliary paging channel, combined with a Walsh sequence having a length not less than 128 elements of the signal.

21. The method according to claim 19, characterized in that it further capture the auxiliary channel synchronization.

22. The method according to claim 19, characterized in that it further capture the auxiliary pilot signal.

23. The method according to item 22, wherein the message paging channel transmitted through the mentioned auxiliary paging channel, transmit data rate is less than 4800 bits per second.

24. The compensation of the Doppler effect in the communication system in which messages are passed on to the low speed of data transmission to the user terminal located inside the building, namely, that take the term is Le message ephemeris, transmitted from the gateway, it is stored in the user terminal message ephemeris, determine the location of the user terminal, determine the Doppler frequency shift based on the said location and said message ephemeris, which is stored in the user terminal, and capture the pilot signal.

25. The method according to paragraph 24, wherein when determining the location of the user terminal to store the location of the user terminal every time when the user terminal is registered with the gateway.

26. The method according to paragraph 24, wherein when determining the location of the user terminal to receive signals from a global positioning system (GPS).



 

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