CN101325757B - Method for implementing selection of multiple-band multi-access technique district by wireless communication mobile equipment - Google Patents
Method for implementing selection of multiple-band multi-access technique district by wireless communication mobile equipment Download PDFInfo
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Abstract
The invention relates to a method for a radio communication mobile device to implement cell selection with multi-band multi-access technology, comprising the steps of after starting the mobile device, confirming priority for band measurement according to information acquired from storage equipment, such as access technology selected by a user, a cell residence history table and a neighbor cell history table; confirming primary cell list of cell selection according to an indicated value of signal intensity of band measurement with highest priority, an intensity value of pilot channel, and carrier-to-interference ratio of pilot channel; confirming a cell selection list combined with the cell residence history table and the neighbor cell history table; the mobile device resides on the cell with the highest priority in the cell selection list. With the implement method of cell selection with multi-band multi-access technology for the radio communication mobile device, mobile device can reside cells fast, which reduces measurement number of frequency point effectively and reduces operation time, reduces power consumption of the system, and is capable of locating the service cells more accurately, and enhances efficiency of initial residence of cells.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to the technical field of mobile equipment cell selection in a wireless communication system, and specifically relates to a method for realizing multiband multi-access technology cell selection by a wireless communication mobile equipment.
Background
Wireless communication systems currently include two forms, GSM and CDMA. Currently operating in GSM systems, 900M and 1800M dual band solutions are commonly used. For CDMA systems, the International Telecommunications Union (ITU) has established a plurality of frequency bands available for CDMA systems, and although in china only frequency band 0 is used for traffic reasons, with the increasing number of users, the use of only one frequency band in CDMA systems is not satisfactory for users, and cell resources are inevitably increasingly strained, and therefore, like GSM systems, a plurality of frequency bands are inevitably used to provide services to users at the same time.
When the mobile device is powered on, it will attempt to contact the Public Land Mobile Network (PLMN) allowed by the SIM/USIM card, and the mobile device will select an appropriate cell and obtain control channel parameters and other system configuration information from that cell, a process known as cell selection.
When the mobile device is powered on for cell selection, it will first make full band measurements in order to search for an available target cell and camp on. In the GSM system, the mobile device will first search 124 RF channels in GSM900 frequency band, and then search 374 RF channels in GSM1800 frequency band if dual-band is supported, and read the received signal strength on each RF channel, calculate the average level, the whole measurement process will last 3-5 s, and at least 5 measurement sampling points will be extracted from different RF channels during this time.
The mobile device tunes to the carrier with the highest received level and first determines whether the carrier is a Broadcast Control Channel (BCCH) carrier (by searching for FCCH bursts), and if so, the mobile station will attempt to decode the Synchronization Channel (SCH) to synchronize to the carrier and read the system broadcast messages on the Broadcast Control Channel (BCCH). The mobile station may select the cell if the mobile device can correctly decode the data of the Broadcast Control Channel (BCCH) and if the data indicates that the cell belongs to the selected public mobile network (PLMN), the value of the parameter C1 is greater than 0, the cell is not barred from access, and the access class of the mobile station is not barred by the cell. Otherwise, the mobile device will tune to the next highest carrier and repeat the above attempts until an available cell is found.
The parameter C1 is a path loss criterion for cell selection, 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 no suitable cell is found after all 30 strongest radio channels are searched, the mobile will continue to monitor all RF channels, search for Broadcast Control Channels (BCCH) with C1 greater than 0 and which are forbidden to access, and when this carrier is found, the mobile will camp on this cell regardless of public mobile network (PLMN) information, when the mobile only supports emergency calls.
For CDMA systems, cell selection is roughly divided into the following parts:
(1) cell search
The purpose of cell search is to find a suitable cell and obtain its synchronization channel information, and the general steps are as follows:
(a) time slot synchronization
Since the synchronization codes of all primary Synchronization Channels (SCHs) in a Universal Terrestrial Radio Access Network (UTRAN) are the same and transmitted in the first 256 chips of each slot (slot), the same is found in each slot (slot). The mobile device uses a matched filter to achieve synchronization of the time slots.
(b) Frame synchronization
Frame synchronization is performed after slot synchronization, the frame synchronization is performed by using synchronization codes of a secondary Synchronization Channel (SCH), the synchronization codes of the secondary Synchronization Channel (SCH) have 16 synchronization codes, which are different in each slot, 64 groups of code sequences are formed according to the difference of code words in each slot, the 64 groups of code sequences have a characteristic that the cyclic shift results of the 64 groups of code sequences are unique, so that the mobile device performs correlation operation by using one of the 64 groups of code sequences and the received signal, and the secondary synchronization sequence with the largest correlation value is the secondary synchronization sequence used by the cell and determines the scrambling code group and the frame synchronization of the cell.
(c) Primary scrambling code acquisition
There are 8 primary scrambling codes in the scrambling code group, the mobile device calculates the correlation between each scrambling code in the scrambling code group and the scrambling code used on the common pilot channel (CPICH), and the scrambling code with the largest correlation value is the primary scrambling code of the cell.
(2) Reading broadcast channels
Since the synchronization information of the cell has already been obtained in step 1, the information on the broadcast channel of the cell can be obtained based on the information, and the general steps are as follows:
(a) master Information Block (MIB) acquisition
The master information block gives reference and scheduling information for most of the system information blocks in the cell, which may also contain reference and scheduling information for one or two scheduling blocks that give reference and scheduling information for all additional system information blocks not given by other master information. The master information block is periodically transmitted on the broadcast channel and its scheduling is static. The main information includes Public Land Mobile Network (PLMN) information in addition to other System Information Blocks (SIBs) and scheduling information of the scheduling block, and the cell selection process is restarted if it is determined that the currently acquired PLMN information is not consistent with the PLMN of the cell currently to be camped on.
(b) Acquisition of System Information Block (SIB)
After reading the MIB, the mobile device may obtain other system information blocks according to the scheduling information in the MIB. For cell selection, the system information block type 3(SIB3) of the most dominant system information block contains cell selection information parameters, as shown in table 1. Then calculated according to the following formula:
Squal＝Qqualmeas-Qqualmin
Srxlev＝Qrxlevmeas-Qrxlevmin-Pcompensation
wherein the meaning of the individual parameters is given in table 1 below:
| Squal | cell selection quality value |
| Srxlev | Cell selection received signal level value |
| Qqualmeas | Cell selection quality value measured in CPICH Ec/N0 mode |
| Qrxlevmeas | Cell selection level value measured in CPICH RSCP |
| Qqualmin | Acceptable signal quality minimum |
| Qrxlevmin | Acceptable minimum value of level |
| UE_TXPWR_MAX_RACH | Maximum transmit power on uplink channel |
| P_MAX | Maximum transmit power of a mobile device |
| Pcompensation | Max(UE_TXPWR_MAX_RACH-P_MAX，0) |
If the Squal is greater than 0 and the Srxlev is greater than 0, the mobile equipment determines that the cell is a proper cell to reside and reads other required system information, and the cell is selected successfully; if the above condition is not met, the cell selection procedure is restarted.
From the above description, it can be calculated that, for a mobile device supporting GSM dual-band, there are 498 (124+374) RF channels that need to be measured when the mobile device is turned on, each channel at least guarantees 5 measurement sampling points, and there are 2490 (498 × 5) sampling points that need to be measured when the whole full-band measurement is completed. However, it is not necessary to measure so many frequency points for initial cell selection, and if it can be quickly camped on a certain cell (even if it is not optimal), it can be finally camped on the optimal cell by means of cell reselection. While camping on a cell by reselection consumes much less resources than camping on a full band.
Moreover, if the signal strength indication of each cell in the frequency band is only used (based on the RSSI value, the strongest RF channel is tried first, and then, the strongest RF channel is used), the probability of cell selection failure is inevitably increased, and the number of cell camping attempts is increased.
For CDMA systems, although only band 0 is currently used, with the increasing number of users in CDMA systems, the use of multi-band support is a necessary option. Although there are great differences between the CDMA system and the GSM system, and the multi-band handover problem is not considered too much in the protocols and standards related to the CDMA system, the principle for controlling the initial selection of cells is consistent, and if a full-band measurement mode is adopted, there will be a problem similar to the GSM system.
In summary, the power consumption, the power-on time, and the calculation cost of the mobile device are greatly consumed by adopting the full-band measurement mode, and 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 selection of a multiband multiple access technology by a wireless communication mobile device, which can simultaneously support multiple access technologies and multiband, has the advantages of high success rate, high efficiency, high speed, stable and reliable working performance, and wide application range.
In order to achieve the above object, the method for implementing multi-band multi-access technology cell selection by a wireless communication mobile device of the present invention is as follows:
the method for realizing the cell selection of the multiband multi-access technology by the wireless communication mobile equipment is mainly characterized by comprising the following steps:
(1) the mobile equipment carries out starting initialization operation;
(2) the mobile device determines whether an available wireless access technology exists;
(3) if not, the cell selection process of the mobile device fails; if so, the mobile device switches to the wireless access technology;
(4) the mobile equipment carries out frequency band measurement priority analysis and cell camping operation under the corresponding wireless access technology;
(5) if the cell is successfully camped, the cell selection process of the mobile equipment is successful, and the mobile equipment continues to perform subsequent operations;
(6) and (4) if the cell camping fails, returning to the step (2).
The frequency band measurement priority analysis and cell camping operation of the method for realizing the multi-band multi-access technology cell selection by the wireless communication mobile equipment comprises the following steps:
(11) analyzing and determining the frequency band measurement priority under the corresponding wireless access technology;
(12) the mobile device determines whether an available measurement band exists;
(13) if not, returning the result of cell camping failure; if so, the mobile equipment analyzes and generates a cell selection list under the corresponding wireless access technology;
(14) if the cell selection list does not exist, returning to the step (12); if the cell selection list exists, the mobile equipment selects a target cell with the highest priority in the cell selection list to execute cell camping action;
(15) judging whether the target cell meets the cell camping condition;
(16) if yes, the mobile equipment camps on the cell, writes information of the camped cell into the storage module, and returns a successful result of cell camping; if not, the cell information is deleted from the cell selection list and the procedure returns to step (14).
The wireless access technology of the method for realizing the multiband multi-access technology cell selection of the wireless communication mobile equipment is a GSM access technology or a CDMA access technology.
The method for realizing the cell selection of the multiband multi-access technology by the wireless communication mobile equipment for analyzing and determining the frequency band measurement priority under the GSM access technology comprises the following steps:
(1) obtaining information in a GSM access technology cell camping history table from a storage module;
(2) obtaining a band measurement according to the following equationPriority Wj：
Wherein N is the capacity of the GSM cell camping history table, P is the current cell selection weight, j is the frequency band number, i is the serial number,
the cell selection list analysis and generation operation under the GSM access technology of the method for realizing the multiband multi-access technology cell selection by the wireless communication mobile equipment comprises the following steps:
(1) selecting a frequency band with the highest frequency band measurement priority from the measurement frequency bands, and measuring signal intensity indicated values of all frequency points in the frequency band;
(2) performing primary cell list generation operation according to the signal intensity indicated value of each frequency point and the cell camping history table;
(3) the mobile equipment judges whether an available target cell exists in the primary cell list or not;
(4) if not, returning the result that the cell list does not exist;
(5) if yes, according to the cell camping history record table and the neighbor cell history record table, obtaining and setting the selection priority Q of each target cell in the primary selection cell list through the following formulai：
Qi＝RSSIi+Offseti，
Wherein,
a. b, c and d are all priority offsets, a is more than b and more than c is more than d, RSSIiIs a signal strength indicator value;
(6) each target cell is selected according to the selection priority QiAnd performing descending order to obtain a cell selection list, and returning the result of the cell selection list.
The method for realizing the multiband multi-access technology cell selection by the wireless communication mobile equipment for analyzing and determining the frequency band measurement priority under the CDMA access technology comprises the following steps:
(1) obtaining information in a cell camping history table of a CDMA access technology from a storage module;
(2) the band measurement priority W is obtained according to the following formulaj：
Wherein N is the capacity of the CDMA cell camping history table, P is the current cell selection weight, j is the frequency band number, i is the serial number,
the cell selection list analysis and generation operation under the CDMA access technology of the method for realizing the multiband multi-access technology cell selection by the wireless communication mobile equipment comprises the following steps:
(1) selecting a frequency band with the highest frequency band measurement priority from the measurement frequency bands, and measuring signal intensity indicated values of all frequency points in the frequency band;
(2) performing primary cell list generation operation according to the signal intensity indicated value of each frequency point and the cell camping history table;
(3) the mobile equipment judges whether an available target cell exists in the primary cell list or not;
(4) if not, returning the result that the cell list does not exist;
(5) if so, measuring the pilot channel strength value of each target cell in the primary cell list;
(6) calculating the carrier-to-interference ratio of the pilot channel of each cell according to the pilot channel strength value of each target cell;
(7) performing secondary cell selection list generation operation according to the pilot channel strength value, the pilot channel carrier-to-interference ratio and the cell camping historical record table of each target cell;
(8) the mobile equipment judges whether an available target cell exists in the secondary cell selection list or not;
(9) if not, returning the result that the cell list does not exist; if yes, according to the cell camping history record table and the neighbor cell history record table, obtaining and setting the selection priority Q of each target cell in the secondary cell selection list through the following formulai：
Qi＝RSCPi+Qffseti，
Wherein,
a. b, c and d are all priority offset, a is more than b and more than c is more than d, RSCPiIs a pilot channel strength value;
(10) selecting each target cell according to the selectionPriority QiAnd performing descending order to obtain a cell selection list, and returning the result of the cell selection list.
The operation of generating the initial selection cell list of the method for realizing the multi-band multi-access technology cell selection by the wireless communication mobile equipment comprises the following steps:
(1) calculating the RSSI of the judgment threshold by adopting a statistical average mode for the signal strength indicated value in the cell camping historical record tableTH；
(2) The signal strength indicating value and RSSI of each frequency pointTHComparing;
(3) if the signal strength indicated value of the corresponding frequency point is higher than or equal to RSSITHThen the frequency point is added to the list of the primary cell; otherwise, the frequency point is abandoned.
The secondary cell selection list generating operation of the method for realizing the multiband multi-access technology cell selection by the wireless communication mobile equipment comprises the following steps:
(1) respectively calculating a decision threshold RSCP (received Signal code Power ratio) by adopting a statistical average mode for a pilot channel strength value and a pilot channel carrier-to-interference ratio in a cell camping historical record tableTHAnd ECN0TH；
(2) Pilot channel strength value and pilot channel carrier-to-interference ratio of each target cell and RSCPTHAnd ECN0THComparing;
(3) if the pilot channel strength value of the corresponding target cell is higher than or equal to RSCPTHAnd the carrier-to-interference ratio of the pilot channel is higher than or equal to ECN0THThen the target cell is added to the secondary cell selection list; otherwise, abandoning the target cell;
(4) and the target cells in the secondary cell selection list are arranged in a descending order according to the pilot channel strength value.
After the mobile device is started, firstly, according to the access technology selected by the user, the cell camping history list and the neighbor cell history list and other information obtained from the storage device, the priority of the measured frequency band is determined, then according to the signal strength indication value (RSSI), the pilot channel strength value (RSCP) and the pilot channel carrier-to-interference ratio (ECN0) measured on the frequency band with the highest priority, the initial cell list selected by the cell is determined, then the cell selection list is determined by combining the cell camping history list and the neighbor cell history list, finally, the mobile device camps on the cell with the highest priority in the cell selection list, thereby realizing that the mobile device can fast camp on the cell and automatically switch the access technology in the system which simultaneously supports multiple access technologies and multiple frequency bands, the number of frequency point measurements is effectively reduced, the operation time is shortened, the power consumption of the system is reduced, meanwhile, the serving cell can be positioned more accurately, and the efficiency of initial cell camping is improved.
Drawings
Fig. 1 is a general flowchart of a method for implementing multi-band multi-access technology cell selection by a wireless communication mobile device according to the present invention.
Fig. 2 is a flowchart illustrating a band measurement priority analysis and cell camping operation in a method for implementing multi-band multi-access technology cell selection by a wireless communication mobile device according to the present invention.
Fig. 3 is a flowchart of generating a cell selection list under the GSM access technology of the present invention.
Fig. 4 is a flow chart of cell selection list generation under CDMA access technology of 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, the method for implementing the multi-band multi-access technology cell selection by the wireless communication mobile device is mainly characterized by comprising the following steps:
(1) the mobile equipment carries out starting initialization operation and obtains the selected wireless access technology from the storage module, wherein the wireless access technology can be a GSM access technology or a CDMA access technology;
(2) the system determines whether there is a radio access technology that has not been attempted and is available;
(3) if not, the cell selection process of the mobile device is ended; if yes, switching to the wireless access technology corresponding to the wireless access technology;
(4) the method for analyzing the frequency band measurement priority and performing the cell camping operation under the corresponding wireless access technology comprises the following steps:
(a) analyzing and determining the frequency band measurement priority under the corresponding wireless access technology, wherein the analyzing and determining the frequency band measurement priority under the GSM access technology comprises the following steps:
(i) obtaining information in a GSM access technology cell camping history table from a storage module;
(ii) the band measurement priority W is obtained according to the following formulaj：
Wherein N is the capacity of the GSM cell camping history table, P is the current cell selection weight, j is the frequency band number, i is the serial number,
the analyzing and determining the frequency band measurement priority under the CDMA access technology comprises the following steps:
(i) obtaining information in a cell camping history table of a CDMA access technology from a storage module;
(ii) the band measurement priority W is obtained according to the following formulaj：
Wherein N is the capacity of the CDMA cell camping history table, P is the current cell selection weight, j is the frequency band number, i is the serial number,
(b) the mobile device determines whether there is a measurement band that has not been attempted and is available;
(c) if not, returning the result of cell camping failure; if the cell selection list exists, the cell selection list analysis and generation operation under the corresponding wireless access technology is carried out, wherein the cell selection list analysis and generation operation under the GSM access technology comprises the following steps:
(i) selecting a frequency band with the highest frequency band measurement priority from the measurement frequency bands, and measuring signal intensity indicated values of all frequency points in the frequency band;
(ii) according to the signal intensity indicated value of each frequency point and the cell camping history table, the primary cell list selection generation operation is carried out, which comprises the following steps: a
(1) Calculating the RSSI of the judgment threshold by adopting a statistical average mode for the signal strength indicated value in the cell camping historical record tableTH；
(2) The signal strength indicating value and RSSI of each frequency pointTHComparing;
(3) if the signal strength indicated value of the corresponding frequency point is higher than or equal to RSSITHThen the frequency point is added to the list of the primary cell; otherwise, abandoning the frequency point;
(iii) the system judges whether an available target cell exists in the primary cell list or not;
(iv) if not, returning the result that the cell list does not exist;
(v) if yes, according to the cell camping history record table and the neighbor cell history record table, obtaining and setting the selection priority Q of each target cell in the primary selection cell list through the following formulai：
Qi＝RSSIi+Qffseti，
Wherein,
a. b, c and d are all priority offsets, a is more than b and more than c is more than d, RSSIiIs a signal strength indicator value;
(vi) each target cell is selected according to the selection priority QiArranging in descending order to obtain a cell selection list, and returning the result of the cell selection list;
the cell selection list parsing and generating operation under the CDMA access technology includes the steps of:
(i) selecting a frequency band with the highest frequency band measurement priority from the measurement frequency bands, and measuring signal intensity indicated values of all frequency points in the frequency band;
(ii) performing primary cell list generation operation according to the signal strength indicating value of each frequency point and the cell camping history table, wherein the steps are similar to the steps;
(iii) the system judges whether an available target cell exists in the primary cell list or not;
(iv) if not, returning the result that the cell list does not exist;
(v) if so, measuring the pilot channel strength value of each target cell in the primary cell list;
(vi) calculating the carrier-to-interference ratio of the pilot channel of each cell according to the pilot channel strength value of each target cell;
(vii) and performing secondary cell selection list generation operation according to the pilot channel strength value, the pilot channel carrier-to-interference ratio and the cell camping history table of each target cell, wherein the secondary cell selection list generation operation comprises the following steps:
(1) respectively calculating a decision threshold RSCP (received Signal code Power ratio) by adopting a statistical average mode for a pilot channel strength value and a pilot channel carrier-to-interference ratio in a cell camping historical record tableTHAnd ECN0TH；
(2) Pilot channel strength value and pilot channel carrier-to-interference ratio of each target cell and RSCPTHAnd ECN0THComparing;
(3) if the pilot channel strength value of the corresponding target cell is higher than or equal to RSCPTHAnd the carrier-to-interference ratio of the pilot channel is higher than or equal to ECN0THThen the target cell is added to the secondary cell selection list; otherwise, abandoning the target cell;
(4) arranging the target cells in the secondary cell selection list in a descending order according to the pilot channel intensity value;
(viii) the system judges whether an available target cell exists in the secondary cell selection list or not;
(ix) if not, returning the result that the cell list does not exist; if yes, according to the cell camping history record table and the neighbor cell history record table, obtaining and setting the selection priority Q of each target cell in the secondary cell selection list through the following formulai：
Qi＝RSCPi+Qffseti，
Wherein,
a. b, c and d are all priority offset, a is more than b and more than c is more than d, RSCPiIs a pilot channel strength value;
(x) Each target cell is selected according to the selection priority QiArranging in descending order to obtain a cell selection list, and returning the result of the cell selection list;
(d) if the cell selection list does not exist, returning to the step (b); if the cell selection list exists, the mobile equipment selects a target cell with the highest priority in the cell selection list to execute cell camping action;
(e) judging whether the target cell meets the cell camping condition;
(f) if yes, the mobile equipment camps on the cell, writes information of the camped cell into the storage module, and returns a successful result of cell camping; if not, deleting the cell information from the cell selection list, and returning to the step (d);
(5) if the cell is successfully camped, the cell selection process of the mobile equipment is finished, and the mobile equipment continues to perform subsequent operations;
(6) and (4) if the cell camping fails, returning to the step (2).
In practical application, the basic process idea of the method of the present invention is as follows:
(1) the mobile equipment is started, historical information of cell selection including an access technology selected by a user, a cell camping historical record table and the like is obtained from the storage equipment, and the priority of frequency band measurement under the current access technology is calculated according to the information;
(2) selecting a frequency band with the highest priority of frequency band measurement, measuring a radio frequency signal strength indicating value (RSSI), sequentially comparing the result with a threshold of the radio frequency signal strength indicating value obtained from a cell camping historical record table after obtaining the result, forming a primary cell selection list if a cell which is greater than or equal to the threshold exists, and designing the selection priority of each frequency point in the cell selection list according to the cell camping historical record table and an adjacent cell historical record table; if the system is a GSM system, executing the step (4), and if the system is a CDMA system, executing the step (3); if no cell list larger than the threshold exists, executing the step (6);
(3) measuring pilot channel strength (RSCP) of cells in the initially selected cell list, calculating carrier-to-interference ratio (ECN0) of the pilot channel, comparing the pilot channel strength and the carrier-to-interference ratio of the pilot channel with threshold values obtained in a cell camping history table respectively, forming a cell selection list by the cells larger than or equal to the threshold, and designing selection priority of each frequency point in the cell selection list according to the cell camping history table and a neighbor cell history table; performing step (4) if the cell selection list exists, and performing step (5) if the cell selection list does not exist;
(4) selecting a first cell of the cell selection list, obtaining system information of the first cell, judging whether the first cell can be successfully camped, if so, successfully camping in the first cell, and ending the process; if the camping can not be performed, executing the step (5);
(5) judging whether a cell still exists in the cell selection list, if so, repeating the step (4); if not, executing the step (6);
(6) the mobile equipment judges whether the current frequency band is the last frequency band under the access technology, if not, the frequency band with the highest frequency band measurement priority is selected, and the step (2) is repeated; if the last frequency band is the frequency band, executing the step (7);
(7) the mobile equipment judges that each access technology is tried, if not, the mobile equipment is switched to the next access technology to repeat the action of the step (2); if each technology is tried, the mobile device can not access the network, and the process is ended.
The specific implementation process of the invention is as follows:
referring to fig. 1, in step 100, the mobile device initializes and obtains information of currently used access technology, a cell camping history table, and a neighbor cell history table from a storage device. If the GSM access technology is currently used, steps 102, 103 and 104 and the subsequent steps are executed; if the CDMA access technology is selected, 105, 106, 107 and the following steps are performed, and the access technology information in the storage device may be set by the user or may be set by default.
In step 102, the priority of the frequency band used in the GSM access technology is analyzed and determined according to the information obtained from the storage device, and the specific operation process is described in detail later.
Step 103 performs a cell camping attempt in GSM access technology, and the specific operation process is described in detail later.
Step 104 is used to determine whether the cell camping attempt of step 103 is successful, and the specific operation process is described in detail later.
If the cell is successfully camped under the GSM access technology, the cell is successfully camped by the process technology. If the camping is unsuccessful, the procedure returns to step 101 to determine whether the CDMA access technology is available and perform the subsequent procedures.
In step 105, the priority of the frequency band used in the CDMA access technology is analyzed and determined according to the information obtained from the storage device, and the specific operation process is described in detail later.
Step 106 performs a cell camping attempt in CDMA access technology, and the specific operation process is described in detail later.
The role of step 107 is to determine whether the cell camping attempt was successful, and if the camping on the CDMA access technology was not successful, return to step 101 to determine whether the GSM access technology is available and perform the subsequent procedures.
In step 101, if it is determined that another access technology is available, automatically switching to a process of cell selection on the technology; if no available access technology exists, the current mobile equipment cannot access the network, the process is finished, and the cell selection fails.
The whole operation flow of the method of the present invention is described above, and how to determine the measurement band priority used for cell selection, how to perform cell camping, and how to determine whether cell camping is successful or not will be described in detail below.
Referring back to fig. 2, the operation flow of cell camping is detailed, and the operation process is applicable to any access technology in the present invention.
In step 200, the priority of the band measurement under the selected access technology is first determined, and the process mainly analyzes the information in the cell camping history table, where the sequence numbers are arranged in time order, and the time is closer the smaller the sequence number is. The GSM access technology cell camping history table is shown in table 2, and the CDMA access technology cell camping history table is shown in table 3.
Table 2.GSM access technology cell camping history table
| Sequence number (i) | Frequency dot number (f) | BSIC (base station identification color code) | RSSI value |
| 1 | 10 | 10 | 60 |
| 2 | 20 | 20 | 59 |
| ...... | ...... | ...... | ...... |
| N-1 | 550 | 30 | 61 |
| N | 30 | 40 | 50 |
Table 3.CDMA access technology cell camping history table
| Sequence number (i) | Frequency point (f) | PGC (Primary scrambling code) | RSSI value | RSCP value | ECN0 value |
| 1 | 10700 | 10 | 70 | 85 | 45 |
| 2 | 10562 | 20 | 68 | 86 | 48 |
| ...... | ...... | ...... | ...... | ...... | ...... |
| N-1 | 10701 | 30 | 50 | 88 | 48 |
| N | 10563 | 40 | 69 | 80 | 42 |
It can be seen from the table that the capacity of the cell camping history record table is N, the frequency point information of N times of cell camping before starting up is recorded, the current cell selection weight is P, which is a fixed value preset by the system, the serial number is i, the selection priority of the frequency band where the frequency point is located is P-i, and the calculation is performed according to the following formula:
determining a band selection priority W according to the result value of the above calculationj，WjThe larger the value, the higher its priority. The priority being both indicative of the cellThe stationarity of the stationing shows the distribution of the frequency band where the cell stationing frequency point is located.
In step 201, judging whether a measurement frequency band exists, if so, executing step 202; otherwise, there is no available frequency band, the mobile device is not successful in camping under the access technology, and the process is finished.
In step 202, the parsing and generating operation of the cell selection list is performed, and the specific operation process is described in detail later.
In step 203, the result of step 202 is judged, if there is a cell selection list, step 204 is executed; otherwise, return to step 201.
In step 204, the target cell with the highest priority in the cell selection list is selected to perform camping while the cell is deleted from the cell selection list to ensure that the target cell is not repeatedly tried. The camping action mainly includes synchronization of the target cell and system information of the received broadcast channel, and the action is performed according to the existing protocols and standards, and the present invention is not further described.
In step 205, it is determined whether the target cell meets the cell camping condition, and the determination of whether the cell camping is successful is performed according to the existing protocols and standards, which is not further described in the present invention. If the camping condition is satisfied, the mobile device camps on the cell, then step 206 is executed, the information of the currently camped cell is updated to the storage device, and the process is ended; if the camping condition is not satisfied, step 207 is executed to remove the information of the currently attempted target cell from the storage device, and the step 203 is returned to select the cell with the highest priority in the cell selection list to retry camping.
From the above, it can be seen that the two key operations of cell camping are selection of band measurement priority and generation of cell selection list.
Please refer to fig. 3 and fig. 4, which illustrate how the cell selection list is generated under GSM and CDMA access technologies, respectively.
Referring to fig. 3, in step 301, a frequency band with the highest priority for band measurement is selected, and RSSI (signal strength indicator) values of all frequency points of the frequency band are measured.
In step 302, an RSSI decision threshold RSSI is calculated according to the cell camping history tableTHThe algorithm directly adopts a statistical averaging mode. The RSSI measured values and the RSSI of all frequency points in the frequency band are comparedTHIn comparison, the frequency points higher than or equal to the threshold are added into the list of the primary cells, and the frequency points lower than the threshold are abandoned.
In step 303, it is determined whether an available target cell exists in the initially selected cell list, and if not, it indicates that there is no available target cell in the current frequency band, and the cell selection list is failed to be generated, and then the process returns. And if there is an available target cell in the initially selected cell list, step 304 is performed.
In step 304, the present invention analyzes and sets the selection priority of each target cell in the primary cell list according to the cell camping history table and the neighbor cell history table. The GSM neighbor cell history table is shown in table 4.
TABLE 4 GSM neighbor cell History Table
| Sequence number (i) | Frequency dot number (f) | BSIC (base station identification color code) |
| 1 | 10 | 10 |
| 2 | 20 | Is unknown |
| ...... | ...... | ...... |
| M-1 | 550 | Is unknown |
| M | 30 | 40 |
The neighbor cell history records only a neighbor cell list of the current serving cell stored before the power-off, and the capacity is M. The selection priority of each cell of the cell selection list is set using the following formula:
Qi＝RSSIi+Offsetiwherein OffsetiThe values of (A) are as follows:
wherein Offset in the above formulaiThe value of (1) needs to be calculated through experimental simulation (the offset parameters are reduced in sequence), and the invention does not limit the specific calculation mode.
In step 305, the cell selection lists are sorted in descending order according to the selection priority, so as to ensure that the first target cell in the list has the highest priority, the cell selection list is successfully generated, and the process is ended.
Therefore, the generation of the cell selection list under the GSM access technology is mainly related to the RSSI (signal level indicator), the cell camping history table and the neighbor cell history table.
Referring back to fig. 4, which is a flow chart illustrating the generation of a cell selection list under CDMA access technology, steps 401, 402, and 403 are substantially identical to the functions illustrated in fig. 3, and in step 403, if it is determined that a primary cell list exists, step 404 is executed. If the primary cell selection list does not exist, the generation of the cell selection list fails, and the process is ended.
In step 404, a pilot channel strength value (RSCP) is measured for each target cell existing in the primary cell list;
in step 405, calculating a pilot channel carrier-to-interference ratio (ECN0) of each cell according to the pilot channel strength values of the respective cells measured in step 404;
in step 406, RSCP values of RSCP and ECN0 are calculated according to the pilot channel strength value and pilot channel carrier-to-interference ratio in the cell camping history tableTHAnd ECN0THThe measured value obtained in step 405 is compared with two thresholds in turn, and if the measured value is greater than or equal to the threshold, the cell is added to the cell secondary selection list, otherwise, the cell is discarded.
Meanwhile, in step 406, the obtained cell secondary selection lists are further required to be arranged in descending order of RSCP.
In step 407, it is determined whether there is an available target cell in the cell secondary selection list, and if not, the generation of the cell selection list fails, and the process ends. If so, step 408 is performed.
And step 408, analyzing and setting the selection priority of each target cell in the secondary cell selection list according to the cell camping history list and the neighbor cell history list. A neighbor cell history table under CDMA access technology is shown in table 5.
TABLE 5 CDMA neighbor cell History Table
| Sequence number (i) | Frequency point (f) | PGC (Primary scrambling code) |
| 1 | 10700 | 10 |
| 2 | 10562 | Is unknown |
| ...... | ...... | ...... |
| M-1 | 10701 | Is unknown |
| M | 10563 | 40 |
The neighbor cell history records only a neighbor cell list of the current serving cell stored before the power-off, and the capacity is M. Setting a selection priority for each cell of a cell selection list using the following formula
Qi＝RSCPi+offsetiWherein OffsetiThe values of (A) are as follows:
qffset in the formulaiThe value of (A) is obtained through experimental simulation calculation, and the invention does not limit the specific calculation mode.
Step 409, the cell selection lists are arranged according to the descending selection priority of the cells, the first target cell in the list is ensured to have the highest priority, the cell selection list is successfully generated, and the process is finished.
After the mobile device is started, firstly, the priority of a measuring frequency band is determined according to the information of the access technology selected by a user, a cell camping history list, an adjacent cell history list and the like acquired from the storage device, then, an initial cell selection list of the cell selection is determined according to a signal strength indication value (RSSI), a pilot channel strength value (RSCP) and a pilot channel carrier-to-interference ratio (ECN0) measured on the frequency band with the highest priority, and finally, the mobile device is combined with the cell camping history list and the adjacent cell history list to determine a cell selection list, so that the mobile device can rapidly camp on the cell in a system which simultaneously supports multiple access technologies and multiple frequency bands and automatically switch the access technology, the number of frequency point measurements is effectively reduced, the operation time is shortened, the power consumption of the system is reduced, meanwhile, the serving cell can be positioned more accurately, and the efficiency of initial cell camping is improved.
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 wireless communication mobile device to implement multi-band multi-access technology cell selection, the method comprising:
(1) the mobile equipment carries out starting initialization operation;
(2) the mobile device determines whether an available wireless access technology exists;
(3) if not, the cell selection process of the mobile device fails; if so, the mobile device switches to the wireless access technology;
(4) the mobile equipment carries out the frequency band measurement priority analysis and the cell camping operation under the corresponding wireless access technology, and comprises the following steps:
(a) analyzing and determining the frequency band measurement priority under the corresponding wireless access technology;
(b) the mobile device determines whether an available measurement band exists;
(c) if not, returning the result of cell camping failure; if so, the mobile equipment analyzes and generates a cell selection list under the corresponding wireless access technology; the wireless access technology is a GSM access technology or a CDMA access technology, and the cell selection list analysis and generation operation under the GSM access technology comprises the following steps:
(i) selecting a frequency band with the highest frequency band measurement priority from the measurement frequency bands, and measuring signal intensity indicated values of all frequency points in the frequency band;
(ii) performing primary cell list generation operation according to the signal intensity indicated value of each frequency point and the cell camping history table;
(iii) the mobile equipment judges whether an available target cell exists in the primary cell list or not;
(iv) if not, returning the result that the cell list does not exist;
(v) if yes, according to the cell camping history record table and the neighbor cell history record table, obtaining and setting the selection priority Q of each target cell in the primary selection cell list through the following formulai：
Qi＝RSSIi+Qffseti，
Wherein,
d is the priority offset, a is more than b and more than c is more than d, RSSIiIs a signal strength indicator value;
(vi) each target cell is selected according to the selection priority QiArranging in descending order to obtain a cell selection list, and returning the result of the cell selection list;
the cell selection list analysis and generation operation under the CDMA access technology comprises the following steps:
(i) selecting a frequency band with the highest frequency band measurement priority from the measurement frequency bands, and measuring signal intensity indicated values of all frequency points in the frequency band;
(ii) performing primary cell list generation operation according to the signal intensity indicated value of each frequency point and the cell camping history table;
(iii) the mobile equipment judges whether an available target cell exists in the primary cell list or not;
(iv) if not, returning the result that the cell list does not exist;
(v) if so, measuring the pilot channel strength value of each target cell in the primary cell list;
(vi) calculating the carrier-to-interference ratio of the pilot channel of each cell according to the pilot channel strength value of each target cell;
(vii) performing secondary cell selection list generation operation according to the pilot channel strength value, the pilot channel carrier-to-interference ratio and the cell camping historical record table of each target cell;
(viii) the mobile equipment judges whether an available target cell exists in the secondary cell selection list or not;
(ix) if not, returning the result that the cell list does not exist; if yes, according to the cell camping history record table and the neighbor cell history record table, obtaining and setting the selection priority Q of each target cell in the secondary cell selection list through the following formulai：
Qi＝RSCPi+Offseti，
Wherein,
priority offset, and a > b > c > d RSCPiIs a pilot channel strength value;
(x) Each target cell is selected according to the selection priority QiArranging in descending order to obtain a cell selection list, and returning the result of the cell selection list;
(d) if the cell selection list does not exist, returning to the step (b); if the cell selection list exists, the mobile equipment selects a target cell with the highest priority in the cell selection list to execute cell camping action;
(e) judging whether the target cell meets the cell camping condition;
(f) if yes, the mobile equipment camps on the cell, writes information of the camped cell into the storage module, and returns a successful result of cell camping; if not, deleting the cell information from the cell selection list, and returning to the step (d);
(5) if the cell is successfully camped, the cell selection process of the mobile equipment is successful, and the subsequent operation is continued;
(6) and (4) if the cell camping fails, returning to the step (2).
2. The method of claim 1, wherein the analyzing to determine the priority of band measurements under GSM access technology comprises:
(1) obtaining information in a GSM access technology cell camping history table from a storage module;
(2) the band measurement priority W is obtained according to the following formulaj：
Wherein N is the capacity of the GSM cell camping history table, P is the current cell selection weight, j is the frequency band number, i is the serial number,
3. the method of claim 1, wherein the analyzing to determine the band measurement priority under CDMA access technology comprises:
(1) obtaining information in a cell camping history table of a CDMA access technology from a storage module;
(2) the band measurement priority W is obtained according to the following formulaj：
Wherein N is the capacity of the CDMA cell camping history table, P is the current cell selection weight, j is the frequency band number, i is the serial number,
4. the method of claim 1, wherein the generating of the list of initially selected cells comprises:
(1) calculating the RSSI of the judgment threshold by adopting a statistical average mode for the signal strength indicated value in the cell camping historical record tableTH；
(2) The signal strength indicating value and RSSI of each frequency pointTHComparing;
(3) if the signal strength indicated value of the corresponding frequency point is higher than or equal to RSSITHThen the frequency point is added to the list of the primary cell; otherwise, the frequency point is abandoned.
5. The method of claim 1, wherein the secondary selected cell list generation operation comprises the steps of:
(1) respectively calculating a decision threshold RSCP (received Signal code Power ratio) by adopting a statistical average mode for a pilot channel strength value and a pilot channel carrier-to-interference ratio in a cell camping historical record tableTHAnd ECN0TH；
(2) Pilot channel strength value and pilot channel carrier-to-interference ratio of each target cell and RSCPTHAnd ECN0THComparing;
(3) if the pilot channel strength value of the corresponding target cell is higher than or equal to RSCPTHAnd the carrier-to-interference ratio of the pilot channel is higher than or equal to ECN0THThen the target cell is added to the secondary cell selection list; otherwise, abandoning the target cell;
(4) and the target cells in the secondary cell selection list are arranged in a descending order according to the pilot channel strength value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102217369A (en) * | 2010-01-15 | 2011-10-12 | 高通股份有限公司 | Priority-based selection of base transceiver stations in a td-scdma wireless communication system |
| CN102158933B (en) * | 2010-02-11 | 2014-01-22 | 富士通株式会社 | Method and device for frequency band searching in TDD-LTE (Time Division Duplex-Long Term Evolution) system |
| CN102932877A (en) * | 2011-08-09 | 2013-02-13 | 中兴通讯股份有限公司 | Method for determining effective cell by multi-mode single-standby terminal, and multi-mode single-standby terminal |
| CN102364969A (en) * | 2011-10-08 | 2012-02-29 | 捷开通讯科技(上海)有限公司 | Setting method of WIFI working channel and apparatus thereof |
| CN102355712A (en) * | 2011-10-11 | 2012-02-15 | 中兴通讯股份有限公司 | Method for accelerating searching speed of public land mobile network and device |
| CN102595526B (en) * | 2012-02-23 | 2017-12-12 | 盐城中咏投资发展有限公司 | The processing method and base station controller of terminal Neighboring Cell List |
| CN103533605B (en) * | 2012-07-04 | 2017-08-08 | 中国移动通信集团公司 | The frequency sweeping method and device of a kind of user terminal |
| CN103841613B (en) * | 2012-11-23 | 2017-10-27 | 京信通信系统（中国）有限公司 | A kind of cell switching method and device |
| CN110351797B (en) * | 2013-10-30 | 2021-11-12 | 荣耀终端有限公司 | Method and device for terminal to reside in cell and mobile terminal |
| EP3282763A4 (en) * | 2015-04-29 | 2018-03-28 | Huawei Technologies Co., Ltd. | Method and apparatus for determining target cell |
| CN104918303B (en) * | 2015-06-12 | 2019-01-15 | 联想(北京)有限公司 | mobile terminal device and control method |
| TWI589169B (en) * | 2015-09-18 | 2017-06-21 | Wireless network communication system and communication method thereof | |
| US11178639B2 (en) * | 2017-02-03 | 2021-11-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement for accessing a communication network |
| CN109582016B (en) * | 2018-11-26 | 2020-07-03 | 中国人民解放军军事科学院国防科技创新研究院 | Robot system for measuring multi-frequency-band autonomous channel quality |
| CN111294883B (en) * | 2019-01-31 | 2021-12-14 | 展讯通信（上海）有限公司 | Cell reselection method and device, storage medium and user terminal |
| CN111065136A (en) * | 2019-12-13 | 2020-04-24 | RealMe重庆移动通信有限公司 | Cell selection method, terminal device and storage medium |
| CN110913459B (en) * | 2019-12-17 | 2022-03-11 | 重庆邮电大学 | Method for optimizing network selection process of multi-mode multi-band user terminal |
| CN113411867A (en) * | 2020-03-17 | 2021-09-17 | 中兴通讯股份有限公司 | Non-independent networking access method, device, terminal and computer readable storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1453333A1 (en) * | 2003-02-26 | 2004-09-01 | Nec Corporation | Cellular phone, method and computer program product for network selection using history data |
| CN1610422A (en) * | 2003-10-24 | 2005-04-27 | 华为技术有限公司 | Method for controlling multimode terminal switch-in |
-
2007
- 2007-06-15 CN CN2007100421072A patent/CN101325757B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1453333A1 (en) * | 2003-02-26 | 2004-09-01 | Nec Corporation | Cellular phone, method and computer program product for network selection using history data |
| CN1610422A (en) * | 2003-10-24 | 2005-04-27 | 华为技术有限公司 | Method for controlling multimode terminal switch-in |
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