Limitation of cellular unit reselection on basis of pilot-signal

FIELD: communications.

SUBSTANCE: methods for limitation of cellular unit reselection according to changes in quality of communication links are submitted. In one aspect the result of measurement of received from basic station pilot-signal power is used as indication of communication link quality. In other aspect hysteresis is used to limit cellular unit reselection, at that, hysteresis value is larger in mediums with relatively high communication link quality and smaller in mediums with relatively low communication link quality. Also various other aspects are presented.

EFFECT: methods provide advantages of cellular unit reselection decrease thereby increasing time in low power consumption mode to decrease power consumption and increase waiting time.

27 cl, 6 dwg

 

Related applications

The present application claims priority in accordance with the provisional application U.S. No. 60/406,455, registered on August 27, 2002 and entitled "REQUIREMENTS WCDMA PHYSICAL layer TO SELECT AND PEREYBERE CELL CELL.

The technical field,

The present invention relates to communication systems and, more specifically, to a new and improved method and apparatus for the limited re-select a cell of a cell based on the power of the pilot signal.

The level of technology

Wireless communication systems are widely used to provide various types of communication such as voice communication and data transmission. These systems can be based on multiple access, code division multiple access (CDMA), multiple access with time division (TDMA), or some other modulation methods. The CDMA system provides certain advantages over other types of systems, including increased system throughput.

A CDMA system may be designed to support one or more CDMA standards such as (1) the "TIA/EIA-95-B Standard compatibility the mobile station and a base station for dual-mode wideband mobile communication system on the basis of the signals spread spectrum" (standard IS-95), (2) the standard offered by a consortium of "3 rdGeneration Partnership Project" (the Project partnership in creating systems of the 3rd generation (3GPP) and embodied in a set of documents, including 3G TS 25.211, 3G TS 25.212, 3G TS 25.213, and 3G TS 25.214 (the W-CDMA), (3) the standard offered by a consortium of 3GPP2 and embodied in a set of documents, including "C.S0002-A Standard physical layer for cdma2000 systems spread spectrum", "C.S0005-a Standard for transmitting signals on the upper level (Level 3) for cdma2000 systems spread spectrum" and "C.S0024-A cdma2000 specification of the radio interface for high-speed packet data" (the cdma2000 standard), and (4) some other standards. Standards other than CDMA, include standards AMPS and GSM.

When a mobile station first detects the system, it identifies one or more available base stations or cell. Usually a separate cell, the cell is selected as a serving cell cell. When the mobile station is not involved in a voice call or data session, it is in standby mode. The mobile station monitors the signals from the serving cell of the cell to determine the occurrence of an event such as an incoming call requiring release of the mobile station in idle mode. Since the communication channel between the serving cell by cell and the mobile station is changed, the mobile station shall the period of the český to check the channel to determine what variety of cell cell is still appropriate. For example, the communication channel will change with the movement of a mobile station between the honeycomb cells in the system or between one or more neighboring systems. From time to time will be to get new work cell cell in accordance with the process known as the process of Pereybere cell cell in a broadband multiple access code division multiple access (W-CDMA) or as a transmission service from standby systems standards IS-95 or cdma2000.

During standby mode, the mobile station may enter a low power or "inactive" state to reduce power consumption. The mobile station may interrupt reception during the inactive mode to turn off the circuits of the reception. Periodically, the mobile station must remain inactive mode or activated, re-discover a serving cell the cell and to control the signal from this cell of the cell to determine whether directed to the mobile station incoming call. During this time, you may run a process Pereybere cell of the cell to determine whether previsor cell cell. For the mobile station, it is desirable to return to the inactive mode as quickly as possible, if m is tenderly to remain in standby mode for power saving. If you are previsor cell cell, the mobile station stays longer in the mode of activation for processing Pereybere cell cell.

Changing conditions of the communication channel, for example due to the movement of the mobile station in the system or changes in the perceived mutual interference serving cell, the cell needs to adjust accordingly. Two or more base stations can at any given time to have a comparable quality metrics. Small changes in conditions in the channel can cause changes in the quality of reception from the base stations. However, previsor cell cell with a quality comparable to the quality of the current cell cell, can give only a slight improvement or no. As previsor cell cell increases the time required to return to the inactive mode, it is desirable to limit previsor, which only leads to a slight improvement or no provides no improvement.

In addition, changes in the relative quality of the communication channel can cause changes in the necessity of Pereybere cell cell. In relatively good channel conditions previsor cell cell may be less desirable because the current serving cell, the cell provides sufficient communication quality. With others the hand, in relatively poor conditions of the channel gains Pereybere cell cells can improve the performance of communication. Thus, the restriction of Pereybere cell cell, adapted appropriately to the changing quality of the communication channel, can increase the time attributable to the inactive mode with low power consumption, thereby reducing the power consumed in the standby mode, and increasing the time of standby. Therefore, in the technique there is a need to limit Pereybere cell cell in accordance with changing conditions in the communication channel.

The invention

Disclosed embodiments of aimed at solving the problem of restrictions Pereybere cell cell in accordance with changing conditions in the communication channel. In one aspect of measurement adopted from the base station power of the pilot signal is used as an indication of the quality of the communication channel. In another aspect, to limit Pereybere cell cell applies a hysteresis, and the hysteresis more at a relatively high quality of the channel and less with relatively low quality channel. Also presents various other aspects. These aspects provide the advantage of limiting Pereybere cell, increasing the time per mode low is the power consumption, allowing you to reduce power consumption and increase the timeout.

The invention provides methods and system elements that implement various aspects, embodiments of and features of the invention, as described below in more detail.

Brief description of drawings

Signs, the nature and advantages of the present invention are explained in the following detailed description with reference to the drawings, in which identical reference position mark corresponding elements, and which represent the following:

Fig. 1 is a General block diagram of a wireless communication system supporting multiple users;

Fig. 2 - possible implementation of the mobile station is configured to select and Pereybere cell;

Fig. 3 is a block diagram of a variant of the method of Pereybere cell cell;

Fig. 4 is a graph of a function of the hysteresis of the received power of the pilot signal for use in the method of Pereybere cell cell

Fig. 5A and 5B is a block diagram of a variant of implementation of the alternative method of Pereybere cell cell.

Detailed description

In Fig. 1 is a diagram of a wireless system 100 connection that can be designed to support one or more CDMA standards and/or projects (for example, the standard W-CDMA standard is t IS-95, the cdma2000 standard, specification HDR). In an alternative embodiment, the system 100 may also use any wireless standard or project, other than the CDMA system, such as the GSM system. In the example embodiment, system 100 may include a base station corresponding to the W-CDMA and GSM.

For simplicity, system 100 is shown containing three base stations 104 that are associated with the two mobile stations 106. The base station and the service area are often called "cell by cell". In systems IS-95 cellular cell may include one or more sectors. In the specification, W-CDMA each sector of the base station and the service area of a sector is defined as a cell cell. The term "base station"used in the present description, can be used interchangeably with the terms "access point" or "NodeB". The term "mobile station" may be used interchangeably with the terms "subscriber terminal (UE), subscriber unit, subscriber station," "access terminal, remote terminal or other relevant terms that are known in the art. The term "mobile station" includes fixed wireless applications.

Depending on how it implements the CDMA system, each mobile station 106 may communicate with od is Oh or more base stations 104 in a straight line at any given moment, and may communicate with one or more base stations via a reverse communication line depending on, if the mobile station is flexible transmission service. Direct link (i.e. a downward link) refers to transmission from the base station to the mobile station, and the reverse link (i.e. upward communication refers to the transmission from the mobile station to the base station.

For clarity, the examples used in the description of the present invention, may assume that the base stations are sources of signals, and the mobile station receivers and obnaruzhivaemye these signals, i.e. signals a straight line. Specialists in the art should understand that the mobile station and the base station can be performed with the data, as presented in the present description, and aspects of the present invention are applied in these situations. The word "exemplary" is used here only in the sense of "serving by example, or illustration". Any embodiment described herein as "exemplary"is not necessarily to be construed as preferred or advantageous compared with other embodiments.

As described above, the cell selection cell is a process that allows the mobile station to select an appropriate cell-cell specific system. Mobile station initially accesses the system is (for example, mode power-up), and selects the base station or the serving cell to cell communication in accordance with certain selection criteria cell of the cell. The mobile station may be in a standby mode, i.e. in the absence of active calls or data sessions. In idle mode, the mobile station may periodically monitor serviced cell cell, in order, among other things, to determine whether directed to the mobile station incoming call. In a conventional wireless communication system mobile station supports communication in the standby mode, or "fixed" for a cell by cell. Periodically, the mobile station can control the serving cell the cell to determine whether another selection conditions. Surrounding the base station can be monitored to determine whether the mobile station to attempt to perevybrany another cell the cell. Previsor cell cell is a process that allows the mobile station to detect and settle for a more "suitable" cell cell than the current serving cell cell. Previsor cell cells - is a term used in W-CDMA, describing a process that is similar to the transfer of standby systems standards IS-95 or IS-2000. In CA the DOI of these three exemplary systems selection and previsor cell cell Autonomous mobile station completes. Thus, the mobile station can perform roaming in different systems or between such systems, updating as appropriate serving cell the cell with the minimum amount of signaling required between the mobile station and various cell cells or base stations in the system.

The mobile station typically maintains various lists of base stations or cell in your current location or in its surroundings. The active set is the set cell, which communicates the mobile station. The active set usually contains only one cell of the cell, i.e. serving cell cell while the mobile station is in idle mode, although the active set can contain any number of cell in the scope of the present invention. The list of neighbor cell can be stored in the list of neighboring cells. Set cell cells that must be periodically monitored, for example, when the serving cell, the cell does not fulfill the selection conditions may be stored in a controlled list. Various methods to determine the active sets, lists of neighboring cells, controlled lists, and the like are well known in the art, and any such method may be used in the scope of the present invention.

In Fig. 1 mobile station 106 may RA is otati with one or more systems 100 links, corresponding to one or more standards, examples of which are given above. The standard system usually provides requirements for cell selection cell, Pereybere and the like. In some cases, the procedure is not explicitly defined, but set out the performance criteria which must be adhered to the base station or mobile station in the system. Exemplary process of selecting a cell of a cell corresponding to W-CDMA and implemented many systems formats (including W-CDMA and GSM), detailed described below with reference to Fig. 5A and 5B. However, the principles of the present invention is not limited to systems W-CDMA and can be applied to any communication system.

Usually for the mobile station, it is desirable to minimize power consumption, which leads to an increase in waiting time or time "talking" for a given configuration of the battery or reduce costs or use less battery power. For the purposes of the description of its implementation options are described in the context of the operation standby mode, i.e. the mode in which it is desirable to work with low power consumption. In the example embodiment, corresponding to the W-CDMA, previsor cell cell (as defined here) is in standby mode. Work in active mode, both the accounts for the switch serving cell according to another set of procedures. However, this difference is only for clarity of description. Specialists in the art can easily adapt the disclosed here principles to any system or mode in which it is desirable limit Pereybere cell cell.

In the embodiment, for W-CDMA mobile station can go into inactive mode, which can be used here interchangeably with the term "standby mode". In the idle mode mobile station sequentially passes through one or more cycles of discontinuous reception (DRX) up until the mobile station does not accept or initiate a call or data transmission. During each DRX cycle, the mobile station goes into the idle mode, the intermittent receiving and blocking the greatest possible number of schemes in order to realize low power consumption. For example, the processing components in the radio frequency (RF) and in the frequency band of the modulating signals may be disabled at this time. During each DRX cycle, the mobile station is activated to control the current serving cell the cell. The mobile station may need to be searched and determining the location of the serving cell of the cell if the channel is changed or lost synchronization between the base station and mobile station is ncia. For the serving cell, the cells may be carried out measurements to determine if still the selection conditions. Periodically you may need to search for controlled set, to determine what conditions Pereybere satisfied. As soon as the current serving cell, the cell is detected and probably updated by Pereybere, the mobile station can control the serving cell cell (for example, a paging communication channel) and returns to the inactive mode for the next DRX cycle, if you do not want the active link. The reduction part of the DRX cycle, during which the mobile station should remain active, provides the corresponding savings in power. As previsor cell cell takes additional time during which the mobile station is active, power can be reduced by restricting Pereybere cell cell only to cases where pervisor will provide significant benefits. Described embodiments of provide for Pereybere cell cell restriction that dynamically adapts to changes in the communication channel experienced by a mobile station.

In an exemplary embodiment, the system is considered, with attributes that match the standards W-CDMA and GSM. For experts in the field of technical and obviously, what is disclosed principles can be applied to many alternative systems.

Fig. 2 depicts a fragment of a variant of implementation of the mobile station 106. The signals are received by the antenna 210 and fed to the receiver 220. The receiver 220 performs processing according to one or more standards of wireless systems such as cellular standards listed above. The receiver 220 performs various processing such as conversion of radio frequency (RF) bandwidth of the modulating signals, amplification, analog-to-digital conversion, filtering and the like. In the technique known various methods. Some or all of the components of the receiver 220 may be disabled or transferred to the state of low power consumption for energy saving in the inactive mode.

The mobile station 106 may communicate with the base station 104 by setting the receiver 220 in accordance with parameters associated with the base station. The receiver 220 may prescribe to periodically tune to the changed frequency to measure the quality of the channel cell of a cell on a different frequency, including the frequency of other systems. The receiver 220 may be used to measure the channel quality of the current serving cell of the cell and the neighboring base stations, although in Fig. 2 for clarity of the discussion shows the individual b is OK 280 evaluation of the signal level (see below).

The signals from the receiver 220 demodulated in the demodulator 230 according to one or more communication standards. In the exemplary embodiment is used, the demodulator can demodulate signals standards W-CDMA and GSM. Additional standards such as IS-95 or cdma2000, also can be supported in an alternative embodiment. The demodulator 230 may perform multi-channel reception (by procedure RAKE reception), compensation, combining facing interleaving, decoding, and various other functions that requires the format of the incoming signals. In the technique known various methods of demodulation.

The decoder 240 messages to or receives demodulated data and allocates the signals or messages directed to the mobile station 106 of the system 100 via one or more base stations 104. The decoder 240 decodes messages various messages used in the installation, maintenance and disconnection of the call (including voice and data sessions) in the system. Messages can include information about the neighboring cell cells. Messages may include various parameters for use in the selection and Pereybere cell cell, described in detail below. Various other types of messages known in the art and can be determined in a variety of supported communication standards. Messages are delivered in PR is cessor 260 for use in subsequent processing. Some or all of the functions of the decoder 240 messages can be executed in the processor 260, although for clarity, the discussion shows a single element.

The signals from the receiver 220 is directed to the search unit 250. The search unit 250 can also be used for the detection of various cell available for the mobile station, including serving cell cell and the neighboring cell of the cell. The search unit 250 can be controlled by the processor 260 to search a cell and display quality metrics of the communication channels associated with these cellular cell processor 260. The search results can be used to control the demodulator 230 to demodulate the various tones, as well as for use in the selection and Pereybere cell cell. The search unit 250 can be used to support search cell systems of any type supported by the mobile station 106.

Block 280 evaluation of the signal level associated with the receiver 220 and is used to generate estimates of different power levels for use in the selection process and Pereybere cell cells, and also for use in various other processing used in connection, for example, when demodulation. Block 280 evaluation of the signal level is shown as a separate unit only for clarity of discussion. Usually this block is combined with other components is, such as the receiver demodulator 220 or 230. Can be used with various types of blocks in assessing the level of the signal, depending on whether the signal or what type of system is evaluated. In an exemplary embodiment, different pilot signals from one of the base stations are used for the assessment of the level signal, examples of which are described in detail below. Generally speaking, any type of unit evaluation metrics the quality of a communication channel may be used instead of block 280 evaluation of the signal level in the scope of the present invention. The quality metric of the communication channel is sent to the processor 260 for use in the selection and Pereybere cell cell, as described here.

The received data can be transmitted to the processor 260 for use in voice communication or data, and various other components. The mobile station 106 is typically equipped with features modulate and transmit data to one or more base stations. Additional components to support voice or data applications is well known in the art and not shown.

The processor 260 may be a General purpose microprocessor, digital signal processor (DSP) or a specialized processor. The processor 260 may perform some or all functions of the receiver 220, a demodulator 230, block 250 is oisca, block 280 assessment of the level signal, the decoder 240 messages, and any other processing required for the mobile station. The processor 260 may be associated with specialized hardware to assist in these tasks (details not shown). Application data or voice applications can be external to the mobile station 106. For example, connected externally laptop can ensure their performance on a secondary processor in the mobile station 106 (not shown) or the processor 260. The processor 260 is associated with the memory 270, which can be used for storing data and instructions to perform various processes and methods described herein. Specialists in the art it is obvious that the memory 270 may include one or more memory component of various types, which can be embedded completely or partially in the processor 260.

Fig. 3 illustrates a variant of the method of limits Pereybere cell cell based on the received power of the pilot signal. In an exemplary embodiment, the method according to Fig. 3 is performed once during each DRX cycle. The process begins at step 310, after a period during which the reception was blocked. Measured received energy of the current active set, i.e. the active set is a, used during the previous DRX cycle. The process goes in a crucial block 320.

In the final block 320 determines whether the search of the monitored set or not. Under certain conditions, if the measured energy of the active set is sufficient, there is no need to determine the quality of the alternative base stations listed in the testing set, and the procedure can be completed. Previsor cell cell is not required, and will remain active current active set. If you want to search the monitored set, then the process moves to step 330. Stages 330-370 can be used for making decisions about Pereybere cell cell that is limited to avoid excessive Pereybere, according to the principles of the present invention. In the technique known various methods for determining the need for additional searching, examples of which are described in detail below with reference to Fig. 5A and 5B. Any method now known or developed, can be used together with the methods of Pereybere cell cell described here.

At step 330, the search is performed on all listed in the monitored set cell to cell, and for each measured energy. The definition of a controlled set may vary, and essentially at this stage can be searched by subset access the data cell. For example, you may search on the subset of the cell on the current frequency or multiple frequencies, or even across multiple systems (e.g., neighboring cell GSM cells). There are various ways to determine the required set of controlled cell search in step 330, examples of which are described in detail below with reference to Fig. 5A and 5B, and any method can be used in the scope of the present invention. In an exemplary embodiment, the measured energy of the pilot signal for each cell in a controlled list. After measuring the energies of the candidates on this list, the process moves to step 340.

At step 340 to the measured energy of the current active set, we use the value of the hysteresis. The value of hysteresis may contain one or more component. In an exemplary embodiment, one of the component values of the hysteresis is determined in accordance with the measured energy of one or more pilot signals in the active set. Another component, for example, can be signaled by the system to the mobile station. Using at least one of the components determined in response to the current channel conditions measured by the mobile station, allows you to dynamically adapt previsor cell cell in accordance with the current active set, the received mobile station. Thus, previsor cell cells may be more likely when conditions are relatively poor, thus increasing the probability of finding a more suitable cell cell. When conditions are relatively good, previsor cell becomes less likely, thus avoiding Pereybere cell cell, which can provide a slight improvement or no will improve.

The value of hysteresis can be any function of the received signal level of the currently selected cell of the cell. In an exemplary embodiment, the value of the hysteresis Hs is determined according to equation 1:

where Ecp,s/Io- the ratio of the energy element of the signal-to-interference (Ec/Ioin General, the channel pilot signal (CPICH), measured by the block search (in dB). Hysteresis Hs chart shown in Fig. 4. Specialists in the art it should be clear that equation 1 is given as an example only, and that any function of the received signal level may be used to determine the hysteresis in the scope of the present invention.

After the value of hysteresis is added to the energy of the current selected cell of the cell at step 340, the process proceeds to step 350. At step 350 the energy cell from the monitored set and the current active nab the RA are ranked according to the measured energy (including the modified hysteresis energy active cell cell). The process continues in a crucial block 360. In the final block 360, if the energy of the current active cell cell in a modified form is the highest ranked energy, Pereybere cell cell is not required, and the process can be completed. If not, there is a transition to step 370 to perform previsor cell cell cell, which was adopted by the highest energy. After Pereybere cell processing is completed.

In an exemplary embodiment, the method described with reference to Fig. 3, is performed once during each DRX cycle. The mobile station is activated from a state of low power consumption, during which reception is blocked, determines if a condition is satisfied for Pereybere cell cell according to the described method, performs any required additional treatment processes (such as controlling the paging communication channel, to determine, for example, was directed to the mobile station incoming call) and then re-enters a low power or idle state for the next DRX cycle, if required. Reducing re-election cell on the basis of available mobile stations information on communication channels allows the mobile station to avoid being in active sostoyanii high power consumption and longer than necessary, thereby reducing energy consumption and extending the life of the battery power source or standby time. At the same time, the mobile station communicates with a suitable base station in the standby mode, since previsor cell cell adapted according to the changing conditions of the communication channel in which the mobile station.

Fig. 5A and 5B depict an exemplary method of selecting a cell of a cell, suitable for mobile stations operating systems W-CDMA and GSM. Selection and previsor cell cell is based on the calculation criteria of S, namely Squaland Srxlevdefined in equations 2 and 3:

where:

Ecp/Io- measured by the search block ratio Ec/Io CPICH channel (in dB);

Qqual min- minimum required quality level in the cell;

Ecp- adopted by the power code signal (RSCP), measured in the channel CPICH (in dB);

Qrxlev min- minimum required received level in the cell (dB/MVM);

UE_TXPWR_MAX_RACH - the maximum power that the UE or mobile station may use when transmitting the random access channel (RACH);

P_MAX is the maximum transmitted energy UE or mobile station.

Standard W-CDMA requires that the mobile station has performed cell selection cell in the EAC is wimauma cell by calculating the criteria's for each DRX cycle. It is expected that the mobile station will monitor the results to ensure that the conditions of the cell selection is performed. If the criteria's choice cell cell does not satisfy the requirements of the cell selection cell for a predefined number N of consecutive DRX cycles, the mobile station shall start the measurement for the neighboring cell of the cell (i.e. from the monitored list) and try to perevybrany another cell the cell independently of other rules limiting mobile station in the measurements for the other cell. An exemplary variant of the method depicted in Fig. 5A and 5B, incorporates the requirements of W-CDMA, as well as various aspects of the present invention. The method can be performed during each DRX cycle, following the release of the mobile station from a state of low power, during which the reception was blocked.

The process begins at step 502, where the search is performed to detect and measure the energy of the pilot signal in the active set. There is a transition to step 504 to calculate the criteria's set by equations 2 and 3. The process then passes to a decisive block 506, to verify that you did not select a cell-cell failure for the current active set. Select a cell-cell failure, if the criteria of S, namely Squaland Srxlevthat IU is the more zero. In this example, to start previsor cell cell cell selection should be unsuccessful for N consecutive DRX cycles. If the cell selection failed or did not fail for N consecutive cycles, the process proceeds to a decisive block 508. If the cell selection was unsuccessful for N consecutive cycles, the process moves to step 510 to start the process of Pereybere.

In the final block 508 even if the cell selection cell was not bad for N consecutive DRX cycles, as was verified in the final block 506, if the other criteria are satisfied, the process Pereybere cell cells can still be started. Any criteria measurements can be used to initiate the process of Pereybere cell cell that should be obvious to a person skilled in this technical field.

In an exemplary embodiment, three separate types of controlled cell can be scheduled for a search to determine whether there should be previsor cell cell (described below). If Squal, Squal,sfor serving cell decreases below the parameter Sintrasearchthey should be planned vnutrichasovye measurement controlled cell. The parameter Sintrasearchcan be defined by the system through radio. In an exemplary embodiment, the minimum level is set at S intrasearchby setting it to the maximum of any of the transferred Sintrasearchand Sminwhere Sminis calculated using the equation for Squalat Ec/Nochannel CPICH installed at -8 dB. If Squai,sis less than the parameter Sintersearchthey should be planned megastate measurement controlled cell. Sintersearchcan be signaled by the system over the air. If Squai,sfalls below the parameter Sinter-RATthey should be planned alternative measurement method radio access (RAT) or inter-RAT controlled cell. An example of a search method for inter-RAT might be searching for a neighboring cell GSM, although any alternative system can be scheduled to search in the scope of the present invention. Note that the monitored set cells should not contain the cells of a particular type. It follows that the planned set cell may be a subset of the monitored cell, regardless of the aforementioned inspections. If any of the above criteria is satisfied, then at step 510, to begin the process of determining whether to be previsor cell cell, as described below. If none of the above criteria is not satisfied, then there is a transition to EB the p 554, where the radio resource controller (RRC) signaling that previsor cell cell is not required. Then the process can be completed.

At step 510 searches for all controlled cell cells which are scheduled to vnutrichasovye, megastate and inter-RAT measurements. In any cell the cell is to search for, can be determined using the criteria described in connection with the decision block 508. If the system is not defined, the parameter Sintrasearchthe search should be conducted on all vnutricletocnam cell to the cells in the monitored list. If the system is not defined, the parameter Sintersearchthe search should be conducted on all megasternum cell to the cells in the monitored list. If the system is not defined, the parameter Sinter-RATthe search should be conducted on all inter-RAT cell to the cells in the monitored list. The process continues at step 512.

At step 512 calculates the value of Qmeas,nfor n neighboring cell, planned from the monitored list. Qmeas,nis an indicator of the power of the signals received from each neighboring cell, and in a possible variant, the value of Qmeas,ncan be calculated in two different ways, described below. Specialists in the art should understand that any indicator of the measured power can be is used in this embodiment, in the scope of the present invention. At this stage 512 Qmeas,nis the measured absolute power in dBm, is used to compare results between the serving cell by cell, vnutricletocnami neighboring cell by cell, megastate neighboring cell by cell and inter-RAT neighboring cell by cell. This parameter is calculated as the power code of the received signal (RSCP) of the CPICH channel for the cell of W-CDMA and as an indicator of received signal level (RSSI) for a cell of the GSM standard. RSCP is calculated as Ec/Io+Iothat normalizes the results for varying levels of mutual interference on multiple frequencies. After Qmeas,ncalculated for all neighboring cells for which the search is conducted, the process goes to step 514. Qmeas,ncan alternatively be calculated as the ratio of Ec/Iothe CPICH channel, measured in dB, as described below for step 544.

At step 514 for each cell for which the search is conducted, the calculated value of Rnranking, defined as Qmeas,n-Qoffsetn. Qoffsetnis determined by the system over the air and installed on Qoffset1nwhen using RSCP or RSSI channel CPICH (for cells of the GSM standard) to calculate Qmeas,nin step 512. Qoffsetnset on Qoffset2nwhen using Ec/Iochannel CPICH to calculate Q meas,nin step 544, described in detail below. Qoffset2 is defined in dBm for Qoffset1 and dB Qoffset2. Although the use of Qoffset can help reduce unwanted Pereybere cell cell specific parameter is not defined by the standard, therefore, it cannot be effectively used to limit Pereybere cell cell. In addition, it does not depend on the current state of the communication channel between the serving cell and the mobile station, and therefore cannot be adapted for varying levels of sensitivity to Pereybere cell cell. The process then passes to a decisive block 516.

A crucial block 516 provides the branch to process, depending on how it was entered stage 514. If Qmeas,nwas calculated using the RSCP (or RSSI), as determined at step 512, then the process moves to step 518. If not, then there is a transition to step 514 was completed through step 544, the process moves to step 530.

At step 518 is set to n = 0. In the loop formed by steps 520-526, n is used as an index for checking the quality of the neighboring cell for which the search is conducted. The process continues to a crucial block 520, where the criteria's defined above in equations 2 and 3, are calculated for the n-th neighboring cell. If Squalor Srxlevfor the n-th neighboring cell is less the zero, then for a given neighboring cell are not met selection criteria cell of the cell. Note that Squal,nnot evaluated for cell GSM standard, therefore, is used only check for Srxlev. Additionally resets the value of Tsr,n timer that indicates how long for cell cells was performed selection criteria, the use of which is described in detail below. If selection criteria cell of the cell are performed for the neighboring cell, the process goes to step 523 and is the increment Tsr.n.

From step 522 or from step 523, the process proceeds to a decisive block 524 to determine whether to list any additional neighboring cells. If so, the process moves to step 526, increment n and return to a decisive block 520 to test the next adjacent cell in accordance with the selection criteria cell of the cell. Otherwise, the process moves to step 530.

At step 530 calculates a value of Rsranking for the serving cell. Rsis calculated as Qmeas,n+Qhyst, where Qmeas,nis calculated for the serving cell using the metric of energy used for measuring neighboring cells, that is, as determined at step 515 or step 544. Qhyst is installed on Qhyst1, if measured value is used to rank, t is aetsa parameter RSCP channel CPICH, and Qhyst1 can be transmitted by the system over the air. Qhyst is set at a maximum of Qhyst2 and Hswhen the measured value is a parameter Ec/Iochannel CPICH. Qhyst2 can be transmitted by the system over the air. Hscan be calculated according to any equation of hysteresis, as should be clear to experts in the given field of technology. In a possible variant of the Hsis calculated according to equation 1. Thus, in this embodiment, the system can introduce hysteresis by passing Qhyst2 radio. However, the minimum value of the hysteresis is entered the value of Hs. As described above with reference to Fig. 3, the use of Hsallows you to limit previsor cell cell in response to changing channel conditions, making previsor less likely when the channel is relatively good, and more likely, when the channel is relatively poor. As soon as the calculated value of Rsranking for a serving cell, the process moves to step 532.

At step 532 ranked the serving cell and the measured adjacent cells according to their values of Rsand Rnthe ranking. The process moves to step 534 to choose the best cellular cell (identified below subscript index bc) as the cell with the highest rank. The process then passes to a decisive block 536.

The EU is in the final block 536 is defined, what is the best cell is the current serving cell, then the process passes to step 554 and indicates that there is no need to Pereybere cell cell, as described above. If the best cell is the cell other than the current serving cell, then the following additional steps to determine whether to perform previsor cell cell. The process then passes to a decisive block 540 to initiate this part of the process.

If in the final block 540 it is determined that the best cell is the cell of the GSM standard, the process proceeds to a decisive block 546. Otherwise, the process proceeds to a decisive block 542.

If in the final block 542 is determined that the previous pass through step 514 using the RSCP of the CPICH channel for Qmeas,nthen there is a transition to step 514 was performed from step 512, and ranked in the controlled list, there are many frequencies, the list is re-ranked using the parameter Ec/Iochannel CPICH. In this case, the process continues at step 544. If step 544 has already been passed during the process for the current DRX cycle, or in the ranked list corresponding to the monitored set, there is only one frequency, then the process continues in the final block 546. Recall that the RSCP=Ec/Io+Io.Iomay vary for different frequencies is therefore using RSCP normalizes the difference, if desired absolute power level. If in the ranked list is used only one frequency, then a second pass using the Ec/Iodoes not change the ranking obtained using RSCP.

At step 544, as mentioned earlier, for Qmeas,nyou will use the parameter RSCP channel CPICH. The process moves to step 514 and the newly calculated values of Rnranking for the controlled list (modified taking into account cells that have not passed the validation criteria for cell selection in a loop formed by steps 518-524 described above). The process then passes to a decisive block 516, where it made the transition to stage 530, as RSCP is no longer measured by the parameter used for the ranked list. Controlled cell and the serving cell (changed due to hysteresis in the stage 530) will be re-ranked at step 532, and 534 will be re-made selection of the best cell. In some cases, the prevalent will be different the best cell, and a crucial block 536 and possibly decisive block 540 will be again passed, with appropriate processing, as described above. If the current serving cell becomes the new best cell, then the process passes to step 554, described above, and previsor cell is not required. If you still are set to the same best cell or selected other is th best cell different from the current serving cell, then the process proceeds to step 546. The process may branch out to a decisive block 540, if the best cell is the cell of the GSM standard, or to a decisive block 542, if the best cell is the cell standards other than GSM. The process will not be to branch off from the casting block 542 to step 544 during this second pass, as described above.

As described above, if the best cell is different from the serving cell, then the transition to a decisive block 546 will be made regardless of whether there was made a second pass, or whether the best cell is the cell of the GSM standard or not. In the final block 546 is Tsr,bc must be greater than the parameter Treselection, which indicates the minimum time during which the cell should be the selection criteria of the cell before the cell can be selected (in the process of Pereybere) as the new current serving cell. The value of the parameter Treselection can be transmitted by the system over the air. If the minimum time specified by the parameter Treselection, is the best cell, the process moves to step 552. At step 552 for RRC States that must be carried out previsor using the best cell as the new serving cell. Then the process can be completed.

If the best cell is not performed is the claim of the minimum time necessary to meet the criteria for cell selection, the process proceeds to step 548. At step 548 selects the next best cell according to the ranking. If the next best cell is the current serving cell, previsor cell is not required, and the process proceeds to step 554, described above, and then exits. If the next best cell is not the current serving cell, then the process returns to a decisive block 546 to test the requirement of a minimum time for the next best cell. The loop formed by steps 546-550, will continue until it is determined the cell for Pereybere (and will not be achieved step 552) or is selected the current cell, and will fail no previsor cells (i.e. reached the stage 554).

As noted above, the process described with reference to Fig. 5A and 5B may be performed once during each DRX cycle to meet the requirements of W-CDMA and achieve the benefits of hysteresis, as described above.

An implementation option, depicted in Fig. 5A and 5B, is a possible example of how restrictions Pereybere cell cell using the above aspects of the invention. This particular example demonstrates the applicability of these aspects to the mobile station, configured to interact with m what these systems, that is, systems of standards W-CDMA and GSM. Specialists in the art can easily extend the principles described with reference to Fig. 5A and 5B, on any combination of systems, parameters, and equations, hysteresis, including as known in the art and perspective. Specialists in the art should understand that the alternative implementation of Fig. 5A and 5B is a concrete example of a more generalized method described with reference to Fig. 3. Various changes may be incorporated in any variant of implementation in the scope of the present invention and easily adapted by experts in the field of technology.

It should be noted that in all variants of implementation described above, the steps of the method can usamusements without deviating from the scope of the invention. In the above description used in many cases, signals, parameters, and procedures related to standards W-CDMA and GSM, but the scope of the present invention is not limited to them. Specialists in the art can easily apply the principles to various other communication systems. Additionally, there may be used other than the described metrics, the quality of the channel, which can be measured by using the pilot signals from different neighboring cell or any other signal, for which the metric indicates the quality of the signals between the different cellular cells and a mobile station. These and other changes will be obvious to a person skilled in this technical field.

Specialists in the art should understand that information and signals may be represented using any of a variety of technologies and methods. For example, data, instructions, commands, information, signals, bits, symbols, and code elements that are referenced in the description, can be represented by electrical voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any of their combinations.

Specialists in the art should also be understood that the various illustrative logical blocks, modules, circuits, and steps of the algorithms described in connection with open options for implementation may be implemented as electronic hardware, computer software, or combinations thereof. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps described above in terms of their functionality. Is such functionality as hardware or software depends upon the particular application and limitations when designing imposed on the overall. Specialists in the art can implement the described functionality in different ways for each particular application, but such decisions during implementation should not be interpreted as causing a departure from the scope of the present invention.

The various illustrative logical blocks, modules, and circuits described in connection to open options for implementation may be implemented or executed by the General purpose processor, a digital signal processor (DSP), a specialized integrated circuit (ASIC), programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the described functions. General-purpose processor may be a microprocessor, but the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example as a combination of a DSP and a microprocessor, a variety of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of method or as is gorithm, described in connection with open options for implementation, can be implemented directly by hardware, a software module executed by a processor, or a combination. A software module may reside in RAM, flash memory, ROM, erasable programmable ROM, electronically-programmable ROM, registers, hard disk, removable disk, CD-ROM or any other form of media for data storage. Exemplary storage media associated with the processor so that the processor can read information from the media and record information on it. Alternatively, the storage media may be embedded in the processor. The processor and the storage media can be stored in the ASIC. ASIC may reside in a user terminal. Alternatively, the processor and the storage media may reside as discrete components in a user terminal.

The previous description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various changes in these variants of the implementation will be obvious to a person skilled in the art, and the General principles defined herein may be PR is changed to other options implementation without deviating from the essence and scope of the present invention. Thus, the present invention is not limited presents options for implementation, and should correspond to the widest extent consistent with the disclosed principles and novel traits.

1. Wireless communication containing

a processor for identifying a serving cell of a cell for intermittent control in an inactive mode and

unit evaluation of the quality of the communication channel for the formation of the metric quality of the communication channel for the serving cell of the cell during the interval control

moreover, the processor is additionally designed to determine whether to search for a neighboring cell on the inspection interval based on a metric of the quality of the communication channel for the serving cell of the cell, and when performing a search of the neighboring cell to change the threshold Pereybere cell cell in accordance with the quality metric of the communication channel for the serving cell of the cell.

2. The device according to claim 1, additionally containing device to detect multiple neighboring cell and measuring the corresponding set of quality metrics communication channels, and the processor identifies one of the many neighboring cell for Pereybere cell of the cell when the corresponding quality metric of the communication channel is not who violates a threshold of Pereybere cell cell.

3. The device according to claim 2, wherein the quality metrics of the communication channels are calculated in accordance with the results of the power measurement of the pilot signal.

4. The device according to claim 3, in which the received measurement result of the power of the pilot signal is measured by the value of the indicator of received signal level (RSSI), carrier, if the neighboring cell cell cell is a cell of the GSM standard.

5. The device according to claim 3, in which the received measurement result of the power of the pilot signal is the measured value of received power code signal (RSCP), if the neighboring cell cell cell is a cell of W-CDMA.

6. The device according to claim 3, in which the received measurement result of the power of the pilot signal is measured by the ratio of the energy of the pilot signal attributable to the code element signal to interference (Ec/Io), if the neighboring cell cell cell is a cell of W-CDMA.

7. The device according to claim 1, in which the threshold value of Pereybere cell the cell is the sum of the metrics of the quality of a communication channel of a serving cell of the cell and hysteresis values.

8. The device according to claim 1, wherein the processor transmits a search of the neighboring cell, if the quality metric of a channel of a serving cell exceeds a predetermined value.

9. The device according to claim 2, in which the processor Eden is epicerol neighboring cell cell, with the highest quality metric of the communication channel from the set of the neighboring cell to Pereybere cell cell.

10. The device according to claim 1, wherein the processor executes previsor cell cell in accordance with a timer that indicates the amount of time during which the neighboring cell cell satisfies at least one criterion of selection.

11. Wireless communication containing

the evaluation unit of the signal to determine the received power of the pilot signal for the serving cell cell

a processor for determining the threshold values of Pereybere cell cell based on the received power of the pilot signal and the hysteresis value, and the value of the hysteresis

installed on the first value, if the received power of the pilot signal is less than the first power level;

installed on the second value, if the received power of the pilot signal is greater than the second power level; and

varies linearly between the first and second values, if the received power of the pilot signal is changed between the first and second levels of the received power of the pilot signal.

12. The wireless device containing a processor for identifying a serving cell of a cell for intermittent control in an inactive mode and

unit quality assessment to the channel due to the formation of a metric of the quality of the communication channel for the serving cell of the cell during the interval control

moreover, the processor is additionally designed to determine whether to search for a neighboring cell on the inspection interval based on a metric of the quality of the communication channel for the serving cell of the cell, and when performing a search of the neighboring cell to change the threshold Pereybere cell cell in accordance with the quality metric of the communication channel for the serving cell of the cell.

13. Wireless communication system, containing the wireless communication device containing

a processor for identifying a serving cell of a cell for intermittent control in an inactive mode and

unit evaluation of the quality of the communication channel for the formation of the metric quality of the communication channel for the serving cell of the cell during the interval control

moreover, the processor is additionally designed to determine whether to search for a neighboring cell on the inspection interval based on a metric of the quality of the communication channel for the serving cell of the cell, and when performing a search of the neighboring cell to change the threshold Pereybere cell cell in accordance with the quality metric of the communication channel for the serving cell of the cell.

14. How Pereybere cell cell, namely, that

identify the service with the starting cell for intermittent control in an inactive mode and

measured quality metric of the communication channel for the serving cell of the cell during the interval control

determine whether to search for a neighboring cell on the inspection interval based on a metric of the quality of the communication channel for the serving cell of the cell, and

when performing a search of the neighbouring cell change threshold value Pereybere cell cell in accordance with the quality metric of the communication channel for the serving cell of the cell.

15. The method according to 14, in which the quality metric of the communication channel is calculated in accordance with the estimate of the received power of the pilot signal.

16. The method according to item 15, in which the quality metric of the communication channel is an estimate of the received power of the pilot signal.

17. The method according to item 15, in which the quality metric of the communication channel is an estimate of the received power of the pilot signal plus a programmable offset.

18. The method according to item 15, in which the threshold value of Pereybere cell the cell is the sum of the metrics of the quality of the communication channel and offset hysteresis.

19. The method according to p, in which the shift of the hysteresis has a first value for a first received power of the pilot signal and a low value for low received power of the pilot signal.

20. Wireless communication containing

means for identifying a service fotovoltaici for intermittent control in an inactive mode and

means for measuring a metric of the quality of the communication channel for the serving cell of the cell during the interval control

means for determining whether to search for a neighboring cell on the inspection interval based on a metric of the quality of the communication channel for the serving cell of the cell, and

means for changing the threshold values of Pereybere cell cell in accordance with the quality metric of the communication channel for the serving cell cell when performing a search of the neighbouring cell.

21. Wireless communication system, containing the wireless communication device containing

means for identifying a serving cell of a cell for intermittent control in the inactive mode,

means for measuring a metric of the quality of the communication channel for the serving cell of the cell during the interval control

means for determining whether to search for a neighboring cell on the inspection interval based on a metric of the quality of the communication channel for the serving cell of the cell, and

means for changing the threshold values of Pereybere cell cell in accordance with the quality metric of the communication channel for the serving cell cell when performing a search of the neighbouring cell.

22. Machine-readable data carrier, physically waples the store machine-readable code and providing when reading his computer execute the method includes

identification of a serving cell of a cell for intermittent control in the inactive mode;

measurement of quality metrics of the communication channel for the serving cell of the cell during the interval control

determining whether to search for a neighboring cell on the inspection interval based on a metric of the quality of the communication channel for the serving cell of the cell, and

when performing a search of the neighbouring cell - change threshold Pereybere cell cell in accordance with the quality metric of the communication channel for the serving cell of the cell.

23. Wireless communication containing

the receiver is capable of forming a metric of the quality of the communication channel for the serving cell, designed for intermittent control in the inactive mode, and for forming at least one metric of quality of the communication channel to at least one neighboring cell of the cell for which can be executed procedure Pereybere cell cells, and

the processor is designed to determine whether to search for a neighboring cell of the cell on the inspection interval based on a metric of the quality of the communication channel, and when searching the neighboring cell for receiving a variable threshold Pereybere honeycomb is the first cell based on a metric of the quality of the communication channel for the serving cell cell, to identify the neighboring cell of the cell with the highest quality metric of the communication channel from at least one neighboring cell of the cell, and to perform Pereybere identified neighboring cell of the cell, if the highest quality metric cellular cell exceeds an adjustable threshold value Pereybere cell cell.

24. The device according to item 23, in which the receiver provides for the formation of at least one metric of quality of the communication channel to at least one neighboring cell of the cell, if previsor cell the cell is allowed, the processor is to determine whether to allow previsor cell cell based on at least one criterion, and if previsor cell the cell is allowed to obtain a variable threshold Pereybere cell of the cell to identify the neighboring cell of the cell and perform previsor identified neighboring cell of the cell.

25. The device according to paragraph 24, in which the processor provides the resolution Pereybere cell cell, if the metric for the desired signal quality is below a predefined threshold within a predefined time interval.

26. The device according to paragraph 24, in which the processor provides the resolution Pereybere cell cell, if the metric for the requested services is amago the received level is below a predefined threshold within a predefined time interval.

27. The device according to item 23, in which the processor provides the performance of Pereybere identified neighboring cell of the cell, if the identified cell cell satisfies at least one criterion for selecting a cell of a cell within a predefined time interval.



 

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1 cl, 7 dwg, 1 tbl

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