CN101547484B - Method for realizing cell re-selection by mobile device in mobile communication system - Google Patents
Method for realizing cell re-selection by mobile device in mobile communication system Download PDFInfo
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Abstract
The invention relates to a method for realizing cell re-selection by a mobile device in a mobile communication system, which comprises the steps that: the mobile device performs the cell selection process and records a measurement result, performs the processing operation of generating a cell re-selection measurement target list according to the measurement result, performs the detection operation of the cell re-selection according to the cell re-selection measurement target list and acquires re-selected target cells which satisfy cell re-selection conditions, and performs the cell re-selection process according to the re-selected target cells. The adoption of the method for realizing the cell re-selection by the mobile device in the mobile communication system effectively realizes the operation of cell selection, also has higher success ratio, remarkably reduces the power consumption of the system under DRX state at the same time, solves the problem of frequent cell re-selection caused by level fluctuation, saves operating cost, improves wireless communication service quality and operation efficiency, saves the energy and reduces the consumption, has steady and reliable working performance and broader application range, and lays a solid foundation for the further development of modern mobile communication technology.
Description
Technical Field
The present invention relates to the field of wireless communication, in particular to the technical field of cell selection of mobile equipment in a wireless communication system, and specifically to a method for realizing cell reselection of mobile equipment in a mobile communication system.
Background
In the currently operated GSM (digital cellular mobile communication system) system, the network performs omni-directional coverage in a cellular form, and after a mobile device selects a cell as a current serving cell, the mobile device will reside in the selected cell under the condition that various conditions are not changed much, and thus, the cell selection process is completed. After this, the mobile device will continue to monitor network coverage in the current environment, including the serving cell on which the mobile device is camped and several neighboring cells around it. In the GSM system, a serving cell periodically broadcasts various types of system information through its BCCH (broadcast control channel) channel, which includes a neighboring cell frequency point configuration table required for cell reselection, and a mobile device monitors BCCH carriers existing in the cell frequency point configuration table.
The mobile device needs to measure the BCCH carriers of the neighboring cells, the measurement of their reception levels needs to be averaged over at least 5 measurement samples, and should take the same number of samples for all BCCH carriers, and the samples allocated to each carrier should be averaged as much as possible during each measurement period, updating at least the 6 strongest carriers per minute. Meanwhile, the mobile device also comprises a task of measuring the BCCH carrier of the current service cell in the routine measuring program, and the mobile device is required to try to decode all system messages broadcasted by the BCCH of the service cell within at least 30 seconds; decoding of all data blocks of the BCCH is performed for at least 5 minutes on the BCCH carriers of the 6 strongest neighbor cells, which data cells contain parameters that influence cell reselection. During the continuous measurement and decoding process, if the mobile device recognizes that a new BCCH carrier frequency becomes one of the 6 strongest carrier frequencies, the BCCH carrier frequency data should be decoded within 30 s. The handset attempts to detect the BSIC (base station color code) of the 6 strongest non-serving cell BCCH carrier frequencies at least every 30 seconds to confirm that it is listening to the same cell. If the BSIC changes, the carrier frequency is considered as a new carrier frequency, and the BCCH data is re-read. In the above case, the MS does not interrupt listening to the PCH (paging control channel) as much as possible. The mobile device will initiate a reselection procedure if the process of monitoring neighboring cells finds that cell reselection conditions are met.
The parameter C1 is a path loss criterion for camping on a cell, and the serving cell's C1 must be greater than 0, which is expressed as follows:
C1＝RXLEV-RXLEV_ACCESS_MIN-MAX((MS_TXPWR_MAX_CCH-P)，0)
unit: dBm
Wherein:
● RXLEV is the average level of mobile station reception
● RXLEV _ ACCESS _ MIN is the minimum receiving level for allowing ACCESS of the mobile station
● MS _ TXPWR _ MAX _ CCH is the maximum transmit power level that can be used by a mobile station to access the system
● P is the maximum output power of the mobile station
If the 30 strongest radio channels are searched and no suitable cell is found, the mobile will continue to monitor all RF channels, search for a Broadcast Control Channel (BCCH) with C1 greater than 0 and not barred access, and when the carrier is found, the mobile will camp on the cell regardless of public mobile network (PLMN) information, where the mobile will only support emergency calls.
Meanwhile, the algorithm adopted by the cell reselection is C2 algorithm, and the calculation formula is as follows:
when PT is not equal to 11111:
C2＝C1+CRO-TO×H(PT-T)
when PT equals 11111:
C2＝C1-CRO
wherein,
PT: PENALTY TIME is penalty time;
CRO: CELL RESELECT OFFSET is a cell reselection OFFSET;
TO: TEMPORARY OFFSET is a TEMPORARY OFFSET;
wherein when X > 0, the function h (X) is 0; when X ≦ O, the function h (X) is 1;
t is a timer, its initial value is 0, when a certain cell is recorded in six adjacent cells with maximum signal level by the mobile station, the counter T corresponding to the cell starts to time, when the cell is removed from the six adjacent cell lists with maximum signal level of the mobile station, the corresponding timer T is reset; after the mobile device finds the presence of a signal from a cell, the timer T starts to set until the value of the timer T reaches PENALTY TIME, which gives the C2 algorithm of the cell a negative OFFSET modification according to the value defined by TEMPORARY OFFSET, which is used to prevent the situation where the mobile station selects a microcell or a cell with less coverage as the serving cell when moving fast. If the signal of the cell is still received after the time is exceeded; otherwise, if the time exceeds the time defined by PENALTY TIME, the temporary offset will not be considered. It is worth noting here that the C2 algorithm functions only when the CELL RESELECTION INDICATION (CELL RESELECTION INDICATION) is active, otherwise the mobile station will not consider the CELL _ reset OFFSET, TEMPORARY OFFSET and PENALTYTIME settings, and thus C2 is C1.
Cell reselection will be triggered when the following occurs (if the C2 algorithm has not been activated, C2 ═ C1):
1) the mobile station calculates that the C2 value of a cell (co-located with the current cell) exceeds the C2 value of the mobile station's current serving cell by 5 s.
2) The mobile station calculates that the C1 value of a certain CELL (not belonging to the same location area with the current CELL) exceeds the sum of the C2 value of the current service CELL of the mobile station and the CELL reselection HYSTERESIS value (CELL SELECTION HYSTERESIS) for continuous 5 s. Cell reselection does not occur immediately if there is cell reselection within the previous 15 s.
3) The current serving cell is forbidden
4) The mobile station monitors for downlink failure.
The downlink signaling fault criterion is based on a downlink signaling fault counter DSC, when a mobile station selects a certain cell, the DSC is set to be integer [90/BS _ PA _ MFRMS ], and the BS _ PA _ MFRMS is a 51TDMA frame multiframe between MS of the same paging group for transmitting paging information to a base station. Therefore, when the mobile station decodes on the paging subchannel, the DSC adds 1 if the mobile station succeeds, and subtracts 4 if the mobile station fails, and when the DSC is 0, the mobile station judges that the downlink signaling fault occurs.
5) The C1 value of the serving cell is continuously less than 0 for 5 s.
6) When the mobile phone randomly accesses, under the condition that the access attempt is still unsuccessful after the maximum retransmission.
When the cell reselection condition is satisfied, the mobile device decodes all BCCH data blocks of the reselected target cell, and when the condition is satisfied, the mobile device reselects.
It is conceivable that if, according to the conventional operation at present, the serving cell level fluctuates greatly and neighboring cells existing in TOP6 are necessarily adjusted continuously if the mobile device is currently in an environment with frequent level fluctuation and large interference, such as a change in the number of monitoring cells in TOP6, a change in cell ranking, etc., then the operations of measuring, synchronizing, decoding BCCH data blocks, etc., of the changed cells would be increased greatly.
In summary, the conventional cell reselection method is very expensive in terms of power consumption and calculation cost of the mobile device, and meanwhile, the use cost of the mobile device is inevitably increased greatly.
Disclosure of Invention
The present invention aims to overcome the defects in the prior art, and provides a method for realizing cell reselection by a mobile device in a mobile communication system, which can effectively perform cell selection operation, has the advantages of high success rate, energy saving, consumption reduction, stable and reliable working performance, and wide application range.
In order to achieve the above object, the method for a mobile device to implement cell reselection in a mobile communication system of the present invention is as follows:
the method for realizing cell reselection by mobile equipment in the mobile communication system is mainly characterized by comprising the following steps:
(1) the mobile equipment carries out starting initialization operation and acquires information in an internal storage module;
(2) carrying out a cell selection process and recording a measurement result;
(3) processing operation of generating a cell reselection measurement target list is carried out according to the measurement result;
(4) performing cell reselection detection operation according to the cell reselection measurement target list, and obtaining a reselection target cell meeting cell reselection conditions;
(5) and performing subsequent cell reselection process according to the reselection target cell.
In the method for realizing cell reselection by the mobile equipment in the mobile communication system, the cell selection process is carried out and the measurement result is recorded, specifically:
and carrying out a cell selection process according to a preset cell selection algorithm in a system of the mobile equipment, and recording a full-band measurement result in the cell selection process.
The processing operation for generating the cell reselection measurement target list in the method for realizing cell reselection by the mobile equipment in the mobile communication system comprises the following steps:
(11) processing operation of generating a basic cell reselection measurement target list is carried out according to the full-band measurement result;
(12) and processing operation of generating a cell reselection measurement target list is carried out according to the basic cell reselection measurement target list.
The processing operation of generating the basic cell reselection measurement target list according to the full-band measurement result in the method for realizing cell reselection by the mobile equipment in the mobile communication system comprises the following steps:
(111) the mobile equipment analyzes the system information when the cell selection is successful and acquires an adjacent cell list contained in the system information;
(112) determining the measurement priority of each cell in the adjacent cell list according to the frequency point measurement level value of each cell in the full-band measurement result;
(113) adding the frequency point with the highest priority in the adjacent cell list into a basic cell reselection measurement target list;
(114) the system detects whether the capacity of the current basic cell reselection measurement target list reaches a basic cell reselection list capacity threshold value preset by the system;
(115) if not, returning to the step (113); and if so, successfully generating the basic cell reselection measurement target list.
The processing operation for generating the cell reselection measurement target list in the method for realizing cell reselection by the mobile equipment in the mobile communication system comprises the following steps:
(121) measuring each frequency point in the basic cell reselection measurement target list to obtain the level value of each frequency point;
(122) sequencing all cells in the basic cell reselection measurement target list according to the level values of all frequency points, and determining the evaluation priority of all cells in the basic cell reselection measurement target list;
(123) evaluating each cell in the basic cell reselection measurement target list according to the evaluation priority, and detecting whether the cell meets the condition existing in the cell reselection measurement target list;
(124) if not, deleting the cell from the basic cell reselection measurement target list, and executing the step (126); if yes, adding the cell into a cell reselection measurement target list, and executing the step (125);
(125) detecting whether the capacity of the cell reselection measurement target list is higher than a cell reselection list capacity threshold value preset by a system; if so, successfully generating the cell reselection measurement target list, and returning; if not, executing step (126);
(126) detecting whether cells which are not evaluated exist in the cell reselection measurement target list;
(127) if yes, returning to the step (122);
(128) if not, detecting whether the capacity of the cell reselection measurement target list is lower than a cell reselection list capacity threshold value preset by the system;
(129) if not, the cell reselection measurement target list is successfully generated and returned;
(130) if so, the mobile device performs the processing operations of re-measuring and supplementing the cell reselection measurement target list.
In the method for realizing cell reselection by the mobile equipment in the mobile communication system, whether the detected cell meets the condition of existing in the cell reselection measurement target list or not is determined, and the method comprises the following steps:
(21) judging whether the cell is successfully synchronized, and if so, executing the step (22); otherwise, executing step (26);
(22) judging whether the decoding on the broadcast control channel of the cell is successful, if so, executing the step (23); otherwise, executing step (28);
(23) calculating the path loss C1 according to the measured level value of the cell;
(24) judging whether the path loss C1 of the cell is greater than 0, if so, subtracting 1 from a loss failure counter; otherwise, adding 4 to the loss failure counter;
(25) judging whether the current loss failure calculator reaches a loss failure threshold value preset by a system, if so, returning a result that the cell does not accord with the condition existing in a cell reselection measurement target list; otherwise, returning the result that the cell meets the condition existing in the cell reselection measurement target list;
(26) adding 1 to a synchronization failure counter;
(27) judging whether the synchronization failure counter reaches a synchronization failure threshold value preset by a system, if so, returning a result that the cell does not accord with the condition existing in the cell reselection measurement target list; otherwise, returning the result that the cell meets the condition existing in the cell reselection measurement target list;
(28) adding 1 to a decoding failure counter;
(29) judging whether the decoding failure counter reaches a decoding failure threshold value preset by a system, if so, returning a result that the cell does not accord with the condition existing in the cell reselection measurement target list; otherwise, returning the result that the cell meets the conditions existing in the cell reselection measurement target list.
The processing operation of performing re-measurement and supplementing a cell reselection measurement target list in the method for realizing cell reselection by the mobile equipment in the mobile communication system comprises the following steps:
(31) the mobile equipment selects the frequency point in the non-basic cell reselection measurement target list from the system information when the cell selection is successful;
(32) measuring the frequency point to obtain the level value of the corresponding frequency point;
(33) regenerating a basic cell reselection measurement target list according to the cell corresponding to each frequency point, sequencing the cells according to the level values of the corresponding frequency points, and determining the evaluation priority of each cell;
(34) repeating the step (123).
The method for realizing cell reselection of the mobile equipment in the mobile communication system has the advantages that the cell reselection measurement target list is generated according to the full-band measurement result and the system information when the analysis cell selection is successful, so that the mobile equipment basically fixes the number of the adjacent cells to be monitored, the fluctuation of the sequencing of the adjacent cells caused by the change of the measurement level is greatly reduced, the operations of measuring, synchronizing and acquiring all system information of the monitored adjacent cells are further reduced, the cell selection operation is effectively realized, the success rate is higher, the power consumption of the system in a DRX state is obviously reduced, the problem of frequent cell reselection caused by the fluctuation of the level is further avoided, the operation cost is saved, the wireless communication service quality and the operation efficiency are improved, the energy is saved, the consumption is reduced, the working performance is stable and reliable, and the cell reselection is realized, The application range is wider, and a solid foundation is laid for the further development of the modern mobile communication technology.
Drawings
Fig. 1 is an overall flowchart of a method for a mobile device to implement cell reselection in a mobile communication system according to the present invention.
Fig. 2 is a flowchart illustrating a process of generating a list of basic cell reselection measurement targets in a method for a mobile device to implement cell reselection in a mobile communication system according to the present invention.
Fig. 3 is a flowchart of a process of generating a cell reselection measurement target list in the method for implementing cell reselection by a mobile device in a mobile communication system according to the present invention.
Fig. 4 is a flowchart of detecting whether a cell meets the condition existing in the cell reselection measurement target list in the method for implementing cell reselection by a mobile device in a mobile communication system according to the present invention.
Detailed Description
In order to clearly understand the technical contents of the present invention, the following examples are given in detail.
Referring to fig. 1 to 4, a method for a mobile device to perform cell reselection in a mobile communication system includes the following steps:
(1) the mobile equipment carries out starting initialization operation and acquires information in an internal storage module;
(2) performing a cell selection process and recording a measurement result, specifically:
performing a cell selection process according to a cell selection algorithm preset in a system of the mobile equipment, and recording a full-band measurement result in the cell selection process;
(3) the processing operation of generating the cell reselection measurement target list is carried out according to the measurement result, and the method comprises the following steps:
(a) the processing operation of generating the basic cell reselection measurement target list is carried out according to the full-band measurement result, and the method comprises the following steps:
(i) the mobile equipment analyzes the system information when the cell selection is successful and acquires an adjacent cell list contained in the system information;
(ii) determining the measurement priority of each cell in the adjacent cell list according to the frequency point measurement level value of each cell in the full-band measurement result;
(iii) adding the frequency point with the highest priority in the adjacent cell list into a basic cell reselection measurement target list;
(iv) the system detects whether the capacity of the current basic cell reselection measurement target list reaches a basic cell reselection list capacity threshold value preset by the system;
(v) if not, returning to the step (iii); if so, successfully generating a basic cell reselection measurement target list;
(b) the processing operation of generating the cell reselection measurement target list is carried out according to the basic cell reselection measurement target list, and the processing operation comprises the following steps:
(i) measuring each frequency point in the basic cell reselection measurement target list to obtain the level value of each frequency point;
(ii) sequencing all cells in the basic cell reselection measurement target list according to the level values of all frequency points, and determining the evaluation priority of all cells in the basic cell reselection measurement target list;
(iii) evaluating each cell in the basic cell reselection measurement target list according to the evaluation priority, and detecting whether the cell meets the condition existing in the cell reselection measurement target list; the detecting whether the cell meets the condition existing in the cell reselection measurement target list comprises the following steps:
judging whether the cell is successfully synchronized, and if so, executing a step II; otherwise, executing the step (sixthly);
judging whether the decoding on the broadcast control channel of the cell is successful, if so, executing the step (c); otherwise, executing step;
calculating path loss C1 according to the measured level value of the cell;
judging whether the path loss C1 of the cell is greater than 0, if so, subtracting 1 from the loss failure counter; otherwise, adding 4 to the loss failure counter;
judging whether the current loss failure calculator reaches a loss failure threshold value preset by the system, if so, returning a result that the cell does not accord with the condition existing in the cell reselection measurement target list; otherwise, returning the result that the cell meets the condition existing in the cell reselection measurement target list;
sixthly, adding 1 to the synchronization failure counter;
judging whether the synchronization failure counter reaches a synchronization failure threshold value preset by a system, if so, returning a result that the cell does not accord with the condition existing in the cell reselection measurement target list; otherwise, returning the result that the cell meets the condition existing in the cell reselection measurement target list;
adding 1 to a decoding failure counter;
ninthly, judging whether the decoding failure counter reaches a decoding failure threshold value preset by the system, if so, returning a result that the cell does not accord with the condition existing in the cell reselection measurement target list; otherwise, returning the result that the cell meets the condition existing in the cell reselection measurement target list;
(iv) if not, deleting the cell from the basic cell reselection measurement target list, and executing the step (vi); if yes, adding the cell into a cell reselection measurement target list, and executing the step (v);
(v) detecting whether the capacity of the cell reselection measurement target list is higher than a cell reselection list capacity threshold value preset by a system; if so, successfully generating the cell reselection measurement target list, and returning; if not, executing step (vi);
(vi) detecting whether cells which are not evaluated exist in the cell reselection measurement target list;
(vii) if yes, returning to the step (ii);
(viii) if not, detecting whether the capacity of the cell reselection measurement target list is lower than a cell reselection list capacity threshold value preset by the system;
(xi) If not, the cell reselection measurement target list is successfully generated and returned;
(x) If yes, the mobile device performs the processing operation of re-measurement and supplementing the cell reselection measurement target list, and the method comprises the following steps:
firstly, the mobile equipment selects frequency points in a non-basic cell reselection measurement target list from system information when the cell selection is successful;
measuring the frequency point to obtain the level value of the corresponding frequency point;
regenerating a basic cell reselection measurement target list according to the cell corresponding to each frequency point, sequencing the cells according to the level values of the corresponding frequency points, and determining the evaluation priority of each cell;
(iv) repeating step (iii) above;
(4) performing cell reselection detection operation according to the cell reselection measurement target list, and obtaining a reselection target cell meeting cell reselection conditions;
(5) and performing subsequent cell reselection process according to the reselection target cell.
In summary, the basic idea of the method for implementing cell reselection by the mobile communication device of the present invention is as follows:
1. starting up initialization operation of the mobile equipment to acquire information in the storage equipment;
2. cell selection is carried out;
3. generating a cell reselection measurement target list;
4. cell reselection detection is carried out according to the cell reselection measurement target list;
5. when the cell reselection condition is met, performing a cell reselection process;
the method mainly comprises the following steps that a basic cell reselection measurement target list needs to be generated:
1. recording the result of the full-frequency-band measurement in the cell selection process;
2. determining the priority of each frequency point according to the measurement level value;
3. selecting a highest priority cell to be added into a basic cell reselection measurement target list;
4. detecting whether the capacity of a basic cell reselection measurement target list is full, if not, returning to the step 3;
5. if the list is full, the generation of the basic cell reselection measurement target list is successful.
Wherein, a cell reselection measurement target list is also required to be generated, and the operation mainly comprises the following steps:
1. measuring each cell in the reselection measurement target list according to the basic cell to obtain a measurement level value of the cell;
2. selecting a certain cell in sequence for evaluation, and detecting whether the certain cell meets the condition of a cell reselection measurement target list;
3. if the condition existing in the cell reselection measurement target list is not satisfied
(1) Deleting it from the cell reselection measurement target list;
(2) detecting whether all evaluations are finished at present;
a) if not, returning to the step 2;
b) if the cell reselection measurement is finished, continuously detecting whether the capacity of the current cell reselection measurement target list is lower than a minimum capacity threshold value;
I) if the capacity is lower than the minimum capacity threshold value, measuring a non-cell reselection measurement target list in a neighbor cell list (BA), and returning to the step 2;
II) if the current cell reselection measurement target list is higher than the minimum capacity threshold value, the current cell reselection measurement target list is successfully generated. And returning.
4. If the condition existing in the cell reselection measurement target list is satisfied,
(1) adding the measurement target list into a cell reselection measurement target list;
(2) detecting whether the capacity of a current cell reselection measurement target list is higher than a maximum capacity threshold value;
a) if the current cell reselection measurement target list is higher than the maximum capacity threshold value, the detection is quitted, and the current cell reselection measurement target list is successfully generated;
b) if the maximum capacity threshold value is lower, the step 3 and the step 2 are returned to.
In practical use, the method for realizing cell reselection by the mobile communication device comprises the following steps:
in step 100, firstly, a cell selection process is completed according to a cell selection algorithm, and at this time, a full-band measurement result in the cell selection process needs to be recorded;
in step 101, a cell reselection measurement target list is generated according to the measurement result recorded in step 100, which will be described in detail later, and the cell reselection measurement target list includes a target cell frequency point for cell reselection, and the mobile device performs a measurement operation according to the frequency point to obtain a measurement result, and continuously updates and maintains the list in a subsequent process;
in step 102, cell reselection detection is performed according to the result obtained in step 101, and the process is performed according to the current existing cell reselection algorithm, which is not described in detail herein;
in step 103, the cell reselection target is determined, and cell reselection is performed.
The following description will focus primarily on generating a list of basic cell reselection measurement targets (steps 200 through 204) and a list of cell reselection measurement targets (steps 300 through 310), where several control variables are provided,
table one, cell reselection measurement target list control variable
| Variables of | Means of |
| CRM_TGT_LIST_MAX_NUM | Cell reselection measurement target list capacity |
| CRM_TGT_LIST_MIN_NUM | Cell reselection measurement target list minimum capacity |
The process of generating the basic cell reselection measurement target list in the method for realizing cell reselection by the mobile equipment comprises the following steps:
in step 200, the mobile device performs a full-band measurement operation for cell selection, and records measurement results of all cells;
in step 201, the cell selection is successful, the system information is analyzed to obtain a neighbor cell list (BA) included therein, and then the measurement priority of each cell in the neighbor cell list is determined according to the measurement result in step 200 and with RSSI as an order;
in step 202, selecting the basic cell reselection measurement target list added by the frequency point with the highest priority in step 201;
in step 203, detecting whether the current basic cell reselection measurement target LIST capacity has reached a capacity threshold CRM _ TGT _ LIST _ MAX _ NUM, if not, returning to step 202; if so, go to step 204;
in step 204, the list of base cell reselection measurement targets is successfully generated.
The process of generating the cell reselection measurement target list in the method for realizing cell reselection by the mobile equipment comprises the following steps:
in step 300, the list of base cell reselection measurement targets has been successfully generated;
in step 301, measuring each frequency point in the cell reselection measurement target list in step 300 to obtain a level value (RSSI value) of each frequency point;
in step 302, sorting each cell in the cell reselection measurement target list according to the measurement result, and determining the priority of each cell measurement result evaluation in the cell reselection measurement target list;
in step 303, the selected cell is evaluated to detect whether it can still exist in the current cell reselection measurement target list, and if the existing condition is not met, step 304 is executed;
in step 304, the detected cell is deleted from the current cell reselection measurement target list;
in step 305, detecting whether there are any cells which are not evaluated currently, and if so, returning to step 302; if it has, go to step 306;
in step 306, it is detected whether the capacity of the current cell reselection measurement target LIST is lower than a specified threshold value CRM _ TGT _ LIST _ MIN _ NUM, if not, step 310 is executed, the generation of the cell reselection measurement target LIST is successful, and the process returns. If the capacity of the current cell reselection measurement target LIST is already lower than CRM _ TGT _ LIST _ MIN _ NUM, then go to step 307;
in step 307, the mobile device will re-measure to supplement the current cell reselection measurement target list. Selecting a frequency point in a non-cell reselection measurement target list in the system information to measure, and repeating the step 302 after obtaining a measurement result;
in the judgment of step 303, if the current cell meets the condition of being added to the cell reselection measurement target list, executing step 308;
in step 308, the mobile device adds the currently detected cell to a cell reselection measurement target list;
in step 309, detecting whether the capacity of the current cell reselection measurement target LIST is higher than a specified threshold value CRM _ TGT _ LIST _ MAX _ NUM, if not, executing step 305; if it is already above the threshold, go to step 310;
in step 310, the cell reselection measurement target list is successfully generated, and then the process returns.
Fig. 4 is a flow chart illustrating the determination of the condition that the target cell exists in the cell reselection measurement target list, and table two shows the required variables in fig. 4.
Table two, cell reselection measurement target condition judgment variable
| Variables of | Means of |
| TGT_FAIL_SYNC_THRESHOLD | Synchronization failure counter threshold |
| TGT_FAIL_DECODE_THRESHOLD | Decoding failure counter threshold |
| TGT_FAIL_C1_THRESHOLD | Loss failure counter threshold |
In step 400, a measurement result value for the target cell is obtained.
In step 401, determining whether the current target cell has been successfully synchronized, if so, executing step 402; otherwise, go to step 408;
in step 402, it is determined whether the decoding on the BCCH of the current target cell is successful, and if so, step 403 is executed; otherwise, go to step 410;
in step 403, calculating a path loss C1 according to the measurement value of the current cell;
in step 404, determining whether the current path loss is greater than 0, if yes, executing step 405; otherwise, go to step 406;
in step 405, the loss failure counter is decremented by 1,
in step 406, the loss failure counter is incremented by 4,
in step 407, it is determined whether the current loss failure calculator reaches a specified THRESHOLD value TGT _ FAIL _ C1_ THRESHOLD, if so, step 413 is executed to return to failure, and the process is ended; otherwise, go to step 412, return success;
in step 408, increment a synchronization failure counter by one indicating that it has currently failed once;
in step 409, detecting whether the synchronization failure counter has reached a THRESHOLD value TGT _ FAIL _ SYNC _ THRESHOLD, if so, executing step 413 to return to failure, and ending the process; if not, then go to step 412 to return a success and the process ends;
in step 410, the decoding failure counter is incremented by one to indicate that the current decoding of the BCCH channel has failed once;
in step 411, it is determined whether the decoding failure counter has reached a THRESHOLD value TGT _ FAIL _ DECODE _ THRESHOLD, if so, step 413 is executed to return a failure, and the process is ended; if not, execution returns a success at step 412 and the process ends.
The method for realizing cell reselection by the mobile equipment in the mobile communication system is adopted, and the cell reselection measurement target list is generated according to the full-band measurement result and the system information when the analysis cell selection is successful, so that the mobile equipment basically fixes the number of the adjacent cells to be monitored, the fluctuation of the sequencing of the adjacent cells caused by the change of the measurement level is greatly reduced, the operations of measuring, synchronizing and acquiring all system information cells of the monitored adjacent cells are further reduced, the cell selection operation is effectively realized, the success rate is higher, the power consumption in the DRX state of the system is obviously reduced, the problem of frequent cell reselection caused by the fluctuation of the level is further avoided, the operation cost is saved, the wireless communication service quality and the operation efficiency are improved, the energy is saved, the consumption is reduced, the working performance is stable and reliable, and the application range is wider, lays a solid foundation for the further development of the modern mobile communication technology.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (5)
1. A method for a mobile device to perform cell reselection in a mobile communication system, the method comprising:
(1) the mobile equipment carries out starting initialization operation and acquires information in an internal storage module;
(2) performing a cell selection process and recording a measurement result, specifically:
performing a cell selection process according to a cell selection algorithm preset in a system of the mobile equipment, and recording a full-band measurement result in the cell selection process;
(3) the processing operation of generating the cell reselection measurement target list is carried out according to the measurement result, and the method comprises the following steps:
(a) processing operation of generating a basic cell reselection measurement target list is carried out according to the full-band measurement result;
(b) processing operation of generating a cell reselection measurement target list is carried out according to the basic cell reselection measurement target list;
(4) performing cell reselection detection operation according to the cell reselection measurement target list, and acquiring a reselection target cell meeting cell reselection conditions;
(5) and performing subsequent cell reselection process according to the reselection target cell.
2. The method as claimed in claim 1, wherein the processing operation of generating the list of basic cell reselection measurement targets according to the full band measurement result comprises the following steps:
(111) the mobile equipment analyzes the system information when the cell selection is successful and acquires an adjacent cell list contained in the system information;
(112) determining the measurement priority of each cell in the adjacent cell list according to the frequency point measurement level value of each cell in the full-band measurement result;
(113) adding the frequency point with the highest priority in the adjacent cell list into a basic cell reselection measurement target list;
(114) the system detects whether the capacity of the current basic cell reselection measurement target list reaches a basic cell reselection list capacity threshold value preset by the system;
(115) if not, returning to the step (113); and if so, successfully generating the basic cell reselection measurement target list.
3. The method of claim 2, wherein the processing operation of generating the cell reselection measurement target list according to the basic cell reselection measurement target list comprises:
(121) measuring each frequency point in the basic cell reselection measurement target list to obtain the level value of each frequency point;
(122) sequencing all cells in the basic cell reselection measurement target list according to the level values of all frequency points, and determining the evaluation priority of all cells in the basic cell reselection measurement target list;
(123) evaluating each cell in the basic cell reselection measurement target list according to the evaluation priority, and detecting whether the cell meets the condition existing in the cell reselection measurement target list;
(124) if not, deleting the cell from the basic cell reselection measurement target list, and executing the step (126); if yes, adding the cell into a cell reselection measurement target list, and executing the step (125);
(125) detecting whether the capacity of the cell reselection measurement target list is higher than a cell reselection list capacity threshold value preset by a system; if so, successfully generating the cell reselection measurement target list, and returning; if not, executing step (126);
(126) detecting whether cells which are not evaluated exist in the cell reselection measurement target list;
(127) if yes, returning to the step (122);
(128) if not, detecting whether the capacity of the cell reselection measurement target list is lower than a cell reselection list capacity threshold value preset by the system;
(129) if not, the cell reselection measurement target list is successfully generated and returned;
(130) if so, the mobile device performs the processing operations of re-measuring and supplementing the cell reselection measurement target list.
4. The method of claim 3, wherein the detecting whether the cell meets the condition existing in the cell reselection measurement target list comprises:
(21) judging whether the cell is successfully synchronized, and if so, executing the step (22); otherwise, executing step (26);
(22) judging whether the decoding on the broadcast control channel of the cell is successful, if so, executing the step (23); otherwise, executing step (28);
(23) calculating the path loss C1 according to the measured level value of the cell;
(24) judging whether the path loss C1 of the cell is greater than 0, if so, subtracting 1 from a loss failure counter; otherwise, adding 4 to the loss failure counter;
(25) judging whether the current loss failure calculator reaches a loss failure threshold value preset by a system, if so, returning a result that the cell does not accord with the condition existing in a cell reselection measurement target list; otherwise, returning the result that the cell meets the condition existing in the cell reselection measurement target list;
(26) adding 1 to a synchronization failure counter;
(27) judging whether the synchronization failure counter reaches a synchronization failure threshold value preset by a system, if so, returning a result that the cell does not accord with the condition existing in the cell reselection measurement target list; otherwise, returning the result that the cell meets the condition existing in the cell reselection measurement target list;
(28) adding 1 to a decoding failure counter;
(29) judging whether the decoding failure counter reaches a decoding failure threshold value preset by a system, if so, returning a result that the cell does not accord with the condition existing in the cell reselection measurement target list; otherwise, returning the result that the cell meets the conditions existing in the cell reselection measurement target list.
5. The method of claim 3, wherein the performing re-measurement and complementing cell reselection measurement target list comprises:
(31) the mobile equipment selects the frequency point in the non-basic cell reselection measurement target list from the system information when the cell selection is successful;
(32) measuring the frequency point to obtain the level value of the corresponding frequency point;
(33) regenerating a basic cell reselection measurement target list according to the cell corresponding to each frequency point, sequencing the cells according to the level values of the corresponding frequency points, and determining the evaluation priority of each cell;
(34) repeating the step (123).
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