Method for decreasing search time of pilot signal with use of information about position of mobile station and device for realization of said method
SUBSTANCE: method includes determining position of mobile station using network, then position is used to determine dimensions of search port and information about other parameters of search, which is used for search for pilot-signals, identified in selected set of pilot-signals. Size of search port is also determined on basis of position of mobile station and another component, related to effects of multi-beam distribution for transmitted pilot-signal.
EFFECT: higher speed of operation.
2 cl, 5 dwg, 1 tbl
The technical field to which the invention relates.
The present invention relates to the field of communications. In particular, the invention concerns a method and device for reducing the search time associated with the transfer of the call from one base station to another base station.
The level of technology
Wireless communication systems in General contain along with other elements of the wireless telephone, usually called a mobile phone which communicates with one or more base stations when you call. The mobile phone communicates with the base stations according to one or more channels in the frequency band assigned to the mobile phone base station controller. Transfer from mobile phone to the base station is performed by the so-called "reverse line, and the transmission from the base station to the mobile station is performed according to the "direct lines of communication." During a call, the mobile station is constantly looking for other base stations, which may require the mobile phone to continue with the call when the moving mobile station.
One of the important elements of a mobile phone used in such a wireless communication system, is the seeker. The finder is programmed to search for pilot signals is transmitted from different base stations in at least three cases: 1) when the mobile phone is trying to "capture" the base station for communication; 2) in the standby state, when the mobile phone operates on the paging channels of communication or access; and (3) the state of the traffic, when the mobile phone controls the channel traffic. The efficiency of the search performed by the mobile phone, is determined by the speed of the search for pilot signals at the frequency assigned to the mobile phone, and at other frequencies. The purpose of the search mode with the selection of time intervals (segmented mode) is a search of all the pilot signals in the neighbor set, before the conclusion of this time interval. The search mode with the selection of time intervals refers to the operating mode of the mobile phone, when he performs control only during selected time intervals. Moreover, when searching for pilot signals on frequency-"the candidate" mobile phone, you must complete search of all the pilot signals in the set of candidates as quickly as possible, so to re-tune to the frequency of service and to minimize the deterioration of speech caused by the search frequency"candidate". As discussed below, the frequency-"the candidate" is the potential frequency for transmission service, and these search methods are used for the coordination of transmission service communications in the wireless communications system.
A. Transmission service
Mobile phone used in wireless is a system with multiple access and code division multiplexing (mdcr), supports procedures for the transfer of three types, when the mobile phone controls the channel traffic. The use of technology mdcr in the communication system with multiple access are disclosed in U.S. patent No. 4901307, issued February 13, 1990, "SPREAD SPECTRUM MULTIPLE EXCESS COMMUNICATION SYSTEM USING SATELLITE OR TERRESTRIAL REPEATERS" ("communication System multiple access spread spectrum, using satellite and terrestrial repeaters"), the rights to which are owned by the assignee of the present invention. There are three types of switching transmission service.
1. Soft transfer services - transfer service in which the mobile phone starts to communicate with the new base station without interrupting the communication with the old base station. Soft transfer service can only be used between channels mdcr with assigning the identical frequency.
2. Hard transfer service mdcr on mdcr - transfer service in which a mobile phone is transferred from one non-overlapping set of base stations to another, change the category of the frequency range, the assignment of frequencies or human offset.
3. Transfer service from mdcr on analogue channels - transmission service in which the mobile phone is transferred from the forward link traffic mdcr on the analog voice channel.
To perform me the coy transmission maintenance mobile phone constantly searches for assigned sets of pilot signals. The term "pilot signal" refers to the pilot channel signal, which is identified by the offset of the pilot sequence signal and assigning frequencies. The pilot signal associated with the traffic channels straight line communication channel mdcr the same straight line or similarly with reverse line communication systems where the use of pilot signals of the reverse link. All the pilot signals in the set of pilot signals are assigning the same frequency mdcr. For clarity, the pilot signals are considered only with respect to a straight line.
Mobile phone searches for pilot signals on the current assigned frequencies mdcr to detect the presence of channels mdcr and measure the level of their signals. When the mobile phone detects a pilot signal of sufficient level that is not associated with any already assigned channel from among channels of traffic straight line, it sends a data message level measurement pilot signal to the base station with which he currently maintains a relationship. Then the base station may assign a mobile phone channel traffic straight line connection associated with this pilot signal, and to instruct the mobile phone to complete the transfer.
The search parameters of the pilot signal and the rules of transmission of data messages of level measurement pilot signal is expressed in the term is x for the following sets of pilot signals:
|Active set:||The pilot signals associated with channels of traffic straight line, which is assigned to the mobile phone.|
|The set of candidates:||The pilot signals that are not currently included in the active set but have been taken with a mobile phone with a sufficient signal level, indicating that the corresponding traffic channels direct communication line can successfully demodulate.|
|Neighbor set:||The pilot signals that are not currently included in the active set or the set of candidates, but are likely candidates for transmission service.|
|The remaining set:||The set of all possible pilot signals in the system when the current assignment of frequencies mdcr, excluding pilots in the neighbor set, the set of candidates and the active set. This set of possible pilot signal comprises a pilot signal whose indexes of the pseudo-random offsets (PS) sequence of the pilot signal are integral multiples of a certain increment of the pilot signal.|
The base station may instruct the mobile phone to search for pilot signals on a different frequency mdcr to detect the presence of channels mdcr and measurement of the levels of their signals. Mobile phone together is t to the base station search results. Depending on the data measuring levels of pilot signals of the base station may instruct the mobile phone to perform a hard handover service from one frequency to another.
The search parameters of the pilot signals are expressed in terms of the following sets of pilot signals:
Neighboring set for frequency candidate: List of pilot signals at the frequency of the candidate mdcr.
Set to search at the frequency of the candidate: a Subset of the neighboring set for frequency candidate that the base station may send the mobile phone to search for.
C. Search for the pilot signal
In existing systems, the base station sets a search window, i.e. the range of COP displacement, in which a mobile phone should look for used components of multipath propagation of the signals. These components of multipath propagation used by the mobile phone for demodulation of the corresponding channel traffic straight line. The criterion of efficiency of search and General criterion for wireless system specified in TIA/EA-95x and TIA/EA-98-In, published by the Association of communications industry, and ANSI J-STD-018, published by the American national standards Institute. These procedures search in the General case, subject to the following rules.
Active recruitment and selection process: Procedure search pilot signals in the active set and the set of candidates is identical. The size of the search window for each pilot signal in the active set and the set of candidates is determined by the number of elementary PS signals given in Table 1 in accordance with. For example,matches the search box of 28 PS elementary signals or ±14 SS elementary signals relative to the center of the search window. The mobile station sets a search window for each pilot signal in the active set and the set of candidates with respect to the previously all available used component of multipath propagation for a given pilot signal.
|Search window||PS elementary signals|
Neighbor set: If the flag is set to other neighboring search window, the size of the search window for each pilot signal in the neighbor set is determined by the number PS of elementary signals given in table 1, in accordance with the size parameter of the search window associated with the pilot signal, which are looking for. If the flag is not set, then the size of the search window for each pilot signal in the neighbor set will be the same and equal to the number PS of elementary signals given in table 1, in accordance with. Mobile phone sets a search window for each pilot signal in the neighboring set of relative displacement of the substation sequence of the pilot signal using the provisional agreement specified time constraint of the mobile phone.
The remaining set: the size of the search window for each pilot signal in the remaining set is determined by the number PS of elementary signals given in table 1, in accordance with . Mobile phone sets a search window for each pilot signal in the remaining set of relative displacement of the substation sequence of the pilot signal using the provisional agreement specified time constraint of a mobile phone. Mobile phone searches for pilot signals in the remaining set, whose indexes offsets PS sequence, the pilot signal is equal to an integer multiple of the increment of the pilot signal.
Set to search for the frequency candidate: If the flag is set for the frequency candidate, the size of the search window for each pilot signal when the search frequency candidate should be determined by the number PS of elementary signals given in table 1, in accordance withassociated with the pilot signal, which are looking for. If the flag is not set, then the size of the search window for each pilot signal in the set to search for a frequency-candidate should be determined by the number PS of elementary signals given in table 1, in accordance with. Mobile phone sets a search window for each pilot signal in the set to search for the frequency candidate relative displacement substation sequence of the pilot signal using the provisional agreement specified time constraint of the mobile phone.
C. the search Time
Every phone manufacturer and h is its way of implementation of search strategies. All strategies time search for specific pilot signal depends on the window size and the hardware used in the finder. When data hardware search time, the pilot signal is directly proportional to the size of the search window. Reducing the size of the search window will result in a significant reduction in search time. Using the existing procedures of the search window sizes are determined mainly by the size of the coverage area of this cell cell. Cell a cell is the geographical area covered by the base station for communication with a mobile phone. Four such cell cell is shown in figure 1. Regardless of the location of the mobile phone in the serving cell the cell current size of the search window correspond to worst-case scenarios. That is, their dimensions are stated for the case when the mobile phone is at the maximum distance from the base station but within the boundaries of a cell of a cell.
Working on the paging communication channel or channel traffic, mobile phone sets its search window for each pilot signal in the neighboring set of relative displacement of the substation sequence of the pilot signal using the provisional agreement specified time constraint of a mobile phone. The temporal reference of the mobile phone is determined previously received al the other useful beam. The size of the search window is determined by the worst-case scenario. For example, figure 1 shows four adjacent cell of the cell 102, 104, 106 and 108 in the wireless system 100, each of which has a pilot signal, designated as PN1, PN2, PN3 and PN4, respectively. The size of the search Windows for the pilot signal PN1 is determined on the basis of the location of the mobile phone at the point A. However, the same search window is used, even if the mobile phone is at point C. This leads to inefficient use of the valuable search engines, because it does not take into account the location of a mobile phone in cell-cell 104. If the mobile phone is at point b, the size of the search window should be reduced in comparison with the size of the search window needed for the case when the mobile phone is at the point A.
D. Methods of positioning
To provide automatic positioning of mobile phones is considered numerous ways. One method involves measuring the difference in time of receipt of signals from multiple cell sites (base stations). These signals triangularity to highlight the location information. To be effective, this method requires high concentrations of cellular components and/or increase the transmission power of the nodes, as in typical systems, the OKR is necessary to each mobile phone is the transmitted signal with a power level sufficient only to achieve the nearest cell site. For a given triangulation to communicate with at least three nodes, which requires an increase in the concentration of cell sites, either increase the signal power of each mobile station. Another approach is to provide the mobile phone with GPS (global positioning System). This approach requires coverage of up to four satellites and is not performance, but at the same time provides maximum accuracy in determining the location of a mobile phone.
The third approach involves the parcel supporting information on the mobile phone that indicates whether the frequency range of mobile phone should be sought carrying GPS. Most GPS receivers use the so-called satellite almanac GPS to minimize the search performed by the receiver in the frequency domain for a signal from the visible satellites. This anthology is a 15000-bit block is approximate ephemeris data and temporary data modeling for the entire constellation. The information in the almanac related to the position of the satellite and the current time of day, is an approximation. Without almanac GPS receiver is implemented broadest search possible frequencies to detect the satellite signal. Requires additional processing to obtain additional information that can help you "capture" other satellites. The process of signal detection can take several minutes due to the large number of frequency sub-bands, which you want to view. Each frequency sub-band has a center frequency and a predetermined width. The presence of the almanac reduces the uncertainty associated with the Doppler frequency shift of the satellite and, therefore, the number of sub-bands, which you want to view. Satellite almanac can be selected from the navigation message, GPS, or sent on a downward straight line from the satellite to the mobile phone in the form of a data message, or alarm messages. Taking this information, the mobile phone performs the processing of GPS signals to determine your location.
Thus, a need exists for a method and device that will be able to use the location information of the mobile phone in combination with the techniques of search pilot signal for increasing the speed at which a mobile phone can search for all the pilot signals on the assigned frequency, when this mobile phone controls the channel traffic. The invention should provide the ability to use information about the physical location is the situation of the mobile phone to determine the size of the search window for each pilot signal in the neighbor set and the set of candidates.
In General, the invention relates to a communication network. In particular, the invention relates to a device and method in which when determining the size of the search Windows for the pilot signal in the neighbor set and the active set candidate uses information about the position of the mobile phone.
One variant of the invention provides a method of searching a pilot signal in a wireless communication network. First, in the network determines the location of a mobile phone. Then the location of mobile phone use when determining the size of the search Windows and information about search options, which is used to search for all pilot signals identified in the set of pilot signals. The size of the search window are also determined based on the location of the mobile phone and another component related to the effects of multipath propagation of the transmitted pilot signal.
In another variant of the invention provides a product containing digital information performed by the block processing digital signals and used for searching a pilot signal in a wireless communication network. In another embodiment, the invention provides a device used for searching a pilot signal. In one embodiment, the device comprises at least one base of a hundred the tion, moreover, each base station transmits the pilot signal and the base station is used to determine the location of the mobile phone communication network. The device may also include at least one mobile phone, and mobile phone is in communication with at least one base station and the mobile phone uses, given him by the sizes of the search Windows and the other search parameters to minimize the search time required to find all the pilot signals associated with the selected set of pilot signals.
The invention provides users with many benefits. One advantage is that in comparison with known methods decreases the time required to find the set of pilot signals. Another advantage is that valuable resources seeker is not spent in vain, because there is the possibility of more effective search. The invention also provides a number of other advantages and benefits will become apparent after reading the subsequent detailed description of the invention.
Brief description of drawings
The nature, objectives, and advantages of the present invention will become more apparent to experts in the art after consideration of the subsequent detailed description together with the accompanying drawings, n which have the same reference position designate identical parts in all the drawings and where
Figure 1 - the four adjacent cell of the cell in a wireless communication system according to the invention;
Fig 2A - wireless communication using a satellite positioning system according to the invention;
Figw - wireless communications network according to the invention;
Figure 3 - block diagram of a mobile phone according to the invention;
Figure 4 is an example of a product according to the invention.
Detailed description of the invention
In figures 2A-4 shows examples of various aspects of the method and device according to the present invention. For ease of explanation, but not with the purpose of any limitation of these examples are described in the context of a device for processing digital signals. A device for processing digital signals used to execute a sequence of machine-readable commands mentioned above can be implemented using various hardware and connections between them. After reading the following description of the methods according to the invention the specialists in the art will become apparent different patterns of these devices for digital signal processing.
All the above mentioned patents and publications described pilot signal is used to "capture". Using the pilot signal allows mobile phone the background in a timely manner to carry out the "capture" the local base station. The mobile phone receives the information for synchronization, including the phase shift of the pseudo-random noise (PS) code and information about the relative signal strength of a received pilot signal distributed by the pilot channel signal.
Detecting a pilot channel signal, the mobile phone also captures the channel synchronization (synchronal), which is associated with the pilot channel signal. The sync channel is used to obtain the exact command setup time coordination and thereby allows a mobile phone to temporarily synchronize their internal circuitry on the system time. This can be very valuable in light of the above discussion, where it was stressed the importance of synchronization of the internal time of the mobile phone on the system time. This allows a mobile phone to know where in the sequence the PS code is this base station, and permits communication between the base station and mobile phone. Accordingly, when the mobile phone is in communication with the base station, the base station transmits to the mobile phone system time, facilitating synchronization.
In communication systems with spread spectrum pilot signal is used for synchronization of the mobile station according to the phase and frequency for transmission to the base station. In the Pref is effected in an example embodiment, the communications system spread spectrum is a system of spread spectrum-direct sequence (broadband modulation). Examples of such systems are described in U.S. patent No. 5056109, issued March 3, 1992, "METHOD AND APPARATUS FOR CONTROLLING TRANSMISSION POWER IN A CDMA MOBILE TELEPHONE SYSTEM ("Method and apparatus for controlling transmission power in a mobile communication system mdcr" and U.S. patent No. 5103459, issued April 7, 1992, "SYSTEM AND METHOD FOR GENERATING SIGNAL WAVEFORMS IN A CDMA CELLULAR TELEPHONE SYSTEM" ("System and method for generating waveforms in a cellular telephone system"), the rights to which are owned by the assignee of the present invention. In the communication system with spread spectrum and direct sequence transmitted signals expanded in the frequency range larger than the minimum bandwidth required to transmit information by modulating the carrier signal data, and then re-modulation-result signal expanding broadband signal. When using the pilot signal according to one variant, the data can be represented as a sequence of all ones. Extends the signal is usually generated by a shift register with linear feedback, the implementation of which is described in detail in the aforementioned patents. Extends the signal can be represented as a rotating vector of the form
To capture a base station, the mobile phone must be synchronized on the received from the base station with which galam as phase φ and on frequency ω . Finder determines the phase φ the received signal. After the definition phase, φ extends signal are frequency, using the demodulation element, which has a hardware tracking phase and frequency. The method by which the mobile phone determines the phase of the received signal, is to test a set of hypotheses about the phase discussed above from the point of view of the search window, and determining whether one of the accepted hypotheses about the phase, also called hypotheses offset correct. The example finder, current using searches in the "window"is given in U.S. patent No. 5805648, issued September 8, 1998, "METHOD AND APPARATUS FOR PERFORMING SEARCH ACQUISITION IN A CDMA COMMUNICATION SYSTEM" ("Method and device for collecting data when searching in the communication system mdcr"), the rights to which are owned by the assignee of the present invention.
In order to provide transmission service call, wireless system uses so-called " search "in selected time intervals" (segmented search). In other words, a mobile phone that search in selected time intervals, emit periodic window (called "intervals") to search for other base stations to which you can transfer the call. The meet is but mobile phones in accordance with the above standards are searching for the signals of the channels, pilot signals, transmitted by the surrounding base stations in a given window, centered on the place in the sequence of SS-code, in which the mobile phone is waiting to detect a pilot channel signal.
The base station with which the mobile phone supports at the moment, the link may send a mobile phone the size of the search window and other parameters. Specialists in the art it is obvious that the above search box to re-capture should be small to avoid long search, but large enough to take into account the standard error of the internal clock. In addition, the search parameters should be defined in detail.
In the example embodiment of the present invention the size of the search Windows for PN1, shown in figure 1, can be reduced by three times in comparison with currently known standard methods. For example, if the mobile phone is at point b, then the search box for PN1 can be reduced three times. If the mobile phone is at point C, the search window may be reduced proportionately. In one embodiment of the invention this is accomplished by using data about the physical location of a mobile phone to determine the exact size of POSCO the wow window. In another embodiment of the invention the location data of the mobile phone are used for the precise determination of all parameters of the search.
For the implementation of this method must know the approximate location of a mobile phone. This location can be defined in various ways known in the art and mentioned above. One way to determine the location of the mobile phone is discussed in simultaneously considering patent application U.S. No. 09/040501 "SYSTEM AND METHOD FOR DETERMINING THE POSITION OF A WIRELESS CDMA TRANSCEIVER" ("System and method for positioning a wireless transceiver mdcr"), filed on March 17, 1998, the rights to which are owned by the assignee of the present invention. From the point of view of the objectives of the present invention in the exact positioning is not necessary. To determine the location of a mobile phone, you can use approximate methods.
As soon as the mobile phone is transferred to the control channel traffic, a base station, which currently communicates, transmits to the mobile phone message about the size of a search window that you want to use to search for pilot signals contained in the neighbor set. The sizes of the search Windows are defined taking into account the location of the mobile phone service with the postal box. In the example shown in table 1 and figure 1, the search box for PN1 can be reduced from 12 to 4 with decreasing window size from 160 elementary signals up to 14 elementary signals if the location of the mobile phone at the point C. Since reduced the size of the search Windows, reduces costs for demodulation, and the search is completed quickly.
The size of the search window has at least two components, one of which refers to the geometric distance between the phone and installed the pilot signal, and the other to the effects of multipath propagation of the transmitted pilot signal. Accordingly, the combined impact of these two components minimizes the size of the search window. In systems mdcr space diversity or diversity slopes of multipath propagation is obtained by providing a signal multipath propagation through the parallel communication line from a mobile phone through two or more cell site. In addition, the diversity of propagation path can be obtained by using a multipath environment by processing with the extension of the spectrum, when separated receiving and processing the signal arriving with different delays distribution. Examples explode tracks multibeam applications is described in U.S. patent No. 5101501, issued March 31, 1992 "SOFT HANDOFF IN a CDMA CELLULAR TELEPHONE SYSTEM" ("Soft transfer in the system of the cellular telephone mdcr") and U.S. patent No. 5109390, issued April 28, 1992, "DIVERSITY RECEIVER IN A CDMA CELLULAR TELEPHONE SYSTEM" ("Receiver with receive diversity in a cellular telephone system mdcr"), the rights to which are owned by the assignee of the present invention.
In another embodiment, the search parameters can also be selected based on the location of the mobile phone. When a mobile phone to control channel traffic, the base station will transmit to the mobile phone search options. To clarify and "fit" search settings use the location data of the mobile station. Such a refinement is used to optimize retrieval procedures. Optimization of the size of the search window, and procedures used by the searcher to perform a search, leads to a reduction in search time.
In yet another embodiment, once the window size corresponding to the geographic areas in cell-cell dimensions of the window are stored in the memory block. You can also remember the parameters of the search procedures. If we assume that cell-cell wireless system does not actually change the size of the search window may be transferred to any mobile phone located in a given geographical area, for their ispolzovaniem mobile phone. The controller of the base station with the location information of the mobile phone can determine the window size and/or parameters of the search procedure and to transfer them to your mobile phone. In another embodiment, the mobile phone is able to remember this information.
Unit components and connections between them.
Below discusses the different options of the device as applied to systems for determining the location of a particular mobile phone options and hardware support. However, specialists in the art it is obvious that you can use many other systems location.
Figure 2(A) presents a scheme of the base station 202 and the mobile phone 204 in a synchronous communication network mdcr. The network is surrounded by buildings 206 and located on the ground obstacles 208. The base station 202 and the mobile phone 204 is located in the area of the GPS with multiple GPS satellites, four of which are shown under the reference positions 210, 212, 214 and 216. Such equipment GPS is well known: see, for example, Hofmann-Wellenhof, and other GPS theory and practice ("global positioning System. Theory and practice") Second Edition, New York, NY: Springer-Verlai Wien, 1993. In a typical use GPS to determine the position of the GPS receiver, you must have at least four satellites. In contrast to this is the position of the remote station 204 can determine using the signals from a GPS satellite, and in the simplest case, two other terrestrial signal.
Figure 2(B) shows the block diagram of the network mdcr 220. Network 220 includes a switching center mobile communications (CCMS) 222, a controller of the base station (KBS) 224. The public switched telephone network (PSTN) 226 directs calls to traditional landline telephones and other networks (not shown) on CMS 222 and from him. CMS 222 forwards the calls from the PSTN 226 outgoing base station 228 associated with the first cell by cell 230 and from it, and on the identified base station 232 associated with the second cell by cell 234 and from it. In addition, CMS 222 performs the routing of calls between base stations 228 and 232. The source base station 228 directs the calls to the first mobile phone 236 in the first cell the cell 230 through the first path 238 connection. The first tract 238 communication is a two-way communication line with a straight line 240 connection and return line 241 connection. Usually, when the base station 228 communicating with the mobile phone 236, a direct communication line contains the channel traffic.
Figure 2(B) shows that with ASC 224 is connected to the wireless positioning (FSF) 242, but this function may be directly or indirectly connected to other network elements, for example with CMS 222. FSF 242 in the General case contains digital is the second processing device, memory and other elements (not shown)that are typically found in such devices. FSF 242 can be used for various purposes, such as estimating one-way delay as the signal travels in one direction) for a signal transmitted between the base station 228 and mobile phone 236, or control and accounting of the time difference between the reference time point and the time of receipt of the signal.
Although each base station 228 and 232 associated with only one cell by cell, the base station controller often manages, or is associated with base stations in multiple cellular compartments. When the mobile phone 236 moves from the first cell of the cell 230 in the second cell the cell 234, it establishes communication with the base station associated with the second cell by cell. It is usually called "transfer" on the identified base station 232. When "soft" transmission maintenance mobile phone 236 sets the second line 244 connection with the planned base station 232 in addition to the first line 238 connection with the source base station 228. After the mobile phone 236 will enter the second cell cell 234 and will be established channels of communication with the second cell by cell, the remote station may discard the first line 238 connection.
When "hard" the transfer of the operation of the original base when Anzhi 228 and the intended base station 232 normally differs, what line 244 connection with the source base station must be discarded before it can be installed in line with the intended base station. For example, when the source base station is in the system mdcr using the first frequency range and target base station is in the second system mdcr using the second frequency range, the remote station will not be able to keep the lines of communication with both base stations simultaneously, since most of the remote stations do not have the ability to configure two different frequency range. When the first mobile phone 236 moves from the first cell of the cell 230 in the second cell the cell 234, line 238 connection with the source base station 228 is lost and a new line of communication with the intended base station 232.
Refer to figure 3, which shows the mobile phone 300 that supports wireless communication with the base station 302 wireless communication system, indicated generally under the reference position 304. It should be clear that, although figure 3 for clarity, shows one base station 302 and one mobile phone 300, the system 304 typically includes other mobile phones and base stations (not shown). In the example embodiment, the system 304 implements the principles of multiple access code is channelized (mdcr) to distinguish between signals from different mobile phones. The details of the preferred system mdcr set forth in the aforementioned U.S. patent No. 4901307, issued February 13, 1990, "SPREAD SPECTRUM MULTIPLE ACCESS COMMUNICATION SYSTEM USING SATELLITE OR TERRESTRIAL REPEATERS" ("communication System multiple access spread spectrum, using satellite and terrestrial repeaters"), the rights to which are owned by the assignee of the present invention. As shown in figure 3, the mobile phone 300 includes receiver/transmitter 306, which can communicate with the base station 302 via a wireless line 308 connection. In addition, the mobile phone 300 includes a control circuit for controlling the transmission and receipt of data receiver/transmitter 306. Figure 3 these control schemes are presented for simplicity in the form of a processor 310 digital signals. As shown in figure 3, the processor 310 may refer to the device data storage 312. Although not shown, the base station 302 may also have the equipment for processing digital signals, and a storage device. As described in more detail below, the device 312 data storage contains commands that are executed by the processor 310 digital signals. Accordingly, with the exception of the logical structure of the device 312 data storage of the mobile phone 300 is preferably a mobile phone mdcr known to specialists in this field of technology.
The above methods can be implemented, for example, in the operation unit of the digital signal processing that executes a sequence of machine-readable commands. These commands can be in different kind of media signals. In this respect, one aspect of the present invention concerns a product comprising a carrier signal, material embodying a program consists of machine-readable whom the nd, that the block performs digital signal processing to implement the method of reducing the time required to search for the pilot signal.
This media digital signals may include, for example, RAM or a dedicated integrated circuit (neither not shown)located in the communication network. Alternatively, teams may be on another carrier signals, such as magnetic storage media, directly or indirectly available for block processing of digital signals. In the illustrative embodiment of the invention a machine-readable commands can contain lines of compiled native code, for example C, C++, or Java, or other suitable language encoding used by experts in the field of technology.
Although there has been shown, it should be considered as examples of embodiments of the present invention, specialists in the art obvious various changes and modifications without leaving the scope of the invention defined in the attached claims.
1. A method of searching a pilot signal in a wireless communication system, namely, that determine the location of a mobile station in a wireless communication system, determined in the base station sets the size of the search window, corresponds to the set of pilot signals based on the location of the mobile station relative to the corresponding location of the transmitting sources of the multiple pilot signals transmit a message that includes a variety of sizes of the search window that you want to use to search for multiple pilot signals from the base station in the mobile station, and the size of each search window has at least two components, one of which refers to the geometric distance between the mobile station and set the source of the pilot signal, and the other relates to the effects of multipath propagation of the transmitted pilot signal, and search for the pilot signal for each of the multiple pilot signals on the basis of the relevant specified set of dimensions of the search window.
2. A device for searching a pilot signal in a wireless communication system, containing at least one base station, containing the first block of digital signal processing, and at least one base station transmits the pilot signal and the first block of the digital signal processing performed with the possibility of use in determining the location of a mobile station in the communication system, and at least one mobile station containing a second processing unit cyfrowy the signals and means for searching a pilot signal, and at least one mobile station connected with at least one base station for communication, and the second processing unit of the digital signals is configured to use the location of the mobile station, the sizes of the search Windows and information about the parameters to minimize the search time required to find all the pilot signals identified in the set of pilot signals.
FIELD: communications engineering.
SUBSTANCE: mobile station of proposed mobile communication system transmits random access burst during call establishment that includes heading and set of fields. Information presented in these fields is used by base station to aid in more effective establishment of call and faster allocation of channel resources. System is also used to detect, identify, and receive multiple random-access requests. Each mobile station transmits one of plurality of different character pictures of heading in random-access request burst. Base station receiver has plurality of accumulators, each being tuned to different character picture of heading. So, base station receiver can identify simultaneous random-access requests.
EFFECT: reduced time taken for processing random-access call initiated by mobile station.
11 cl, 7 dwg
FIELD: location of wireless terminal in cellular communication network.
SUBSTANCE: novelty is that request on location includes information about quality for determining desired quality of location service quality, checkup of information about quality in location request transmission channel of cellular communication network, and selection of network component to be used for locating wireless terminal basing on requirement to quality indicated by means of information about quality, network component being chosen out of base network and cellular communications radio access network components in which location can be found.
EFFECT: enhanced throughput capacity of network concerning location requests.
14 cl, 4 dwg
FIELD: communication systems.
SUBSTANCE: proposed device designed for selective delivery of mode-governed data transfer service to receiving station to facilitate routing of data transfer service has unit determining type of mode of data transfer service delivery that functions so that in case of background data delivery mode call delivery routing unit transmits data transfer service to assigned receiving station instead of readdressing according to CALL FORWARDING option or to other service interaction pointer.
EFFECT: improved procedure of routing data transfer service to selected terminal.
19 cl, 5 dwg
FIELD: communications engineering.
SUBSTANCE: proposed band selection method for mobile orthogonal frequency division multiple access communication system includes following steps to classify procedures of band selection between sending end and receiving ends with respect to original band selection process, passband width selection process, and periodic band selection process: determination of source band selection code (SC)number for source band selection process; SC number to request passband width for passband width request selection process and periodic SC number for periodic band selection process; determination of periodic SC deferment value in compliance with periodic SC number, and transmission of source SCs, passband width request SC, periodic SCs, and periodic SC deferment values on receiving ends.
EFFECT: minimized time for band selection access.
22 cl, 3 dwg, 4 tbl
FIELD: mobile communications.
SUBSTANCE: after receiving from at least one client equipment unit of a query for broadcast multi-client multimedia service, said service is assigned with service identifier and to said at least one client equipment unit via combined channel a transmission environment access control protocol message is sent, containing service identifier and control data, related to broadcast multi-client multimedia service.
EFFECT: higher efficiency.
4 cl, 13 dwg, 2 tbl
SUBSTANCE: mobile station (MS1,…,MS10) initiates a call, which contains query for priority access. If system lacks resources for immediate processing of call, initiation message is processed by base station (BS1, BS2) and mobile communication commutation center with use of large number of message transfer protocols for determining time, when call was initiated, and priority, related to current call. On basis of priority and time of call base station places the call to queue, while calls with higher priority get better position in queue, then calls with lesser priority. Calls with similar priorities can be placed in queue according to time of receiving each call. When system resources become available, waiting call with higher priority is granted a channel, and call is processed normally.
EFFECT: higher efficiency.
2 cl, 11 dwg
FIELD: radio engineering, applicable in receivers of signals of satellite radio navigational systems.
SUBSTANCE: the micromodule has a group of elements of the channel of the first frequency conversion signals, group of elements of the first channel of the second frequency conversion of signals, group of elements of signal condition of clock and heterodyne frequencies and a group of elements of the second channel of the second frequency conversion signals.
EFFECT: produced returned micromodule, providing simultaneous conversion of signals of standard accuracy of two systems within frequency ranges.
FIELD: radio communication systems.
SUBSTANCE: proposed system has first means for detecting pilot signal associated with fast paging channel basing on signal received, this first means incorporating coherent integrator of first dimensionality and incoherent integrator of second dimensionality; second means for determining operating characteristics of system basing on pilot signal; and third means for optimizing first dimensionality and second dimensionality basing on operating characteristics.
EFFECT: facilitated detection of pilot signal and associated multibeam propagation components at minimal power requirement.
28 cl, 5 dwg, 1 tbl
FIELD: communications engineering.
SUBSTANCE: time interval showing preferable power level and data transfer speed for transmission over additional other-than-voice data channel is chosen basing on transmission power levels for voice data transferred over main channel from base station to remote one. Preferable transmission time interval is chosen without information about message transfer from remote station to base station concerning information about frequency channel or noise for additional channel.
EFFECT: ability of transmitting other-than-voice data together with voice data.
11 cl, 10 dwg
FIELD: electrical communications; duplex signal transmission over communication channels.
SUBSTANCE: newly introduced in transmit and receive signal separation device is transmission-gain control unit inserted in feedback circuit of second memory unit, its input being connected to adder output; this control unit has integrator, register memory, divider, and subtracter, all connected in series, maximal possible value being continuously supplied to second inputs of integrator; operating time of the latter is set by monostable multivibrator.
EFFECT: enhanced noise immunity.
1 cl, 2 dwg
FIELD: radio engineering.
SUBSTANCE: system has first circuit for receiving signal transferred over channel through external transceiver, second circuit for generating series of estimates of signal-to-noise ratio and noise coefficient basing on signal received, third circuit for determining dependence between elements of estimate series, as well as fourth circuit using this dependence for predicting signal-to-noise ratio and noise coefficient for next signal received.
EFFECT: enhanced precision of signal-to-noise ratio prediction.
24 cl, 3 dwg
SUBSTANCE: the device combines the possibility to carry out the search of multiple shifts of single pilot signals, such that are found in the system according to standard IS-95, with the possibility to search multiple pilot signals, such that are found in the global system of navigation and position determination system (GPS). Both searches can be accomplished in a single architecture combining the characteristics of parallel computation of the matched filter with the versatility providing for possibility of fulfillment of a variable number of incoherent accumulations at a high rate for a wide range of search hypotheses with an effective use of resources.
EFFECT: parallel use of the structure of the matched filter by the method of separation in time for the search of multiple windows, as well as arbitrary independent demodulation of the Walsh sequence for each search window; in the conditions of temporary separation search for any shift is accomplished.
14 cl, 9 dwg
FIELD: transmission of information, applicable in cellular and satellite communication systems.
SUBSTANCE: the receiver has two frequency converters, two quadrature correlators, phase error filter, controlled oscillator, two control elements, error delay filter, controlled clock oscillator, reference signal generator, two multipliers, two analog-to-digital converter, delay line, demodulator, decoder, two matched filters, phase shifter.
EFFECT: enhanced power efficiency of the communication system.
2 cl, 3 dwg
FIELD: suppression devices used in radio-engineering systems for suppression of signals (interferences) incoming via the side lobes of the antenna directional pattern.
SUBSTANCE: the digital interference self-compensator has the series-connected first auxiliary antenna, first complex conjugation device, first multiplier, first sample adder, divider, second complex conjugation device, second multiplier and the first subtracting device, whose second input is connected to the output of the main antenna, series-connected second auxiliary antenna, third multiplier, second sample adder, whose output is connected to the second input of the divider; the second inputs of the first and second multipliers are connected to the output of the first auxiliary antenna, and the second input of the third multiplier is connected to the output of the first complex conjugation device, the second and third subtracting devices, the inputs of the first complex conjugation device, first and second multipliers are connected to the output of the third subtracting device, whose inputs are connected to the outputs of the first and second auxiliary antennas, the input of the third multiplier is connected to the output of the second subtracting device, whose inputs are connected to the outputs of the main and auxiliary antennas, the input of the first subtracting device is disconnected from the main antenna, connected to the output of the second subtracting device, and the output of the first subtracting device serves as the output of the interference suppression device.
EFFECT: eliminated suppression of useful signal at the output of self-compensator.
FIELD: radio engineering, applicable in portable receivers of composite phase-manipulated signals.
SUBSTANCE: the method and device for suppression of narrow-band interference at reception of composite phase-manipulated signals are based on attenuation of the respective sections of the signal spectrum, which is attained due to the fact that the initial pseudorandom sequence is summed up in the path of the correlator reference signal with its copy delayed by a certain period of time, the delay time is determined by the delay search unit with the reference signal in the form of the sum of the initial pseudorandom sequence and the pseudorandom sequence with a varying delay as the time equal to the relative delay of the pseudorandom sequence, t which the voltage at the output of the delay search unit is minimal.
EFFECT: simplified realization, since three is no need to use a computer unit.
2 cl, 5 dwg
FIELD: radio communications.
SUBSTANCE: device has information signal router, second and first activators, first and second power amplifiers, first and second activators feeding blocks, first and second main power blocks of power amplifiers, additional power block, first and second activators current control sensors, first and second power amplifiers current control sensors, first and second activators state analyzers, first and second power amplifiers current control sensors, antenna switch, antenna, reservation control block, first and second circulators at activators outputs, first and second circulators at inputs of power amplifiers, first and second activators switches, first and second power amplifiers inputs switches.
EFFECT: higher reliability, higher speed of operation, higher efficiency.
3 cl, 3 dwg
FIELD: radio engineering; construction of radio communication, radio navigation, and control systems using broadband signals.
SUBSTANCE: proposed device depends for its operation on comparison of read-out signal with two thresholds, probability of exceeding these thresholds being enhanced during search interval with the result that search is continued. This broadband signal search device has linear part 1, matched filter 2, clock generator 19, channel selection control unit 13, inverter 12, fourth adder 15, two detectors 8, 17, two threshold comparison units 9, 18, NOT gates 16, as well as AND gate 14. Matched filter has pre-filter 3, delay line 4, n attenuators, n phase shifters, and three adders 7, 10, 11.
EFFECT: enhanced noise immunity under structural noise impact.
1 cl, 3 dwg