CN110913459B - Method for optimizing network selection process of multi-mode multi-band user terminal - Google Patents

Method for optimizing network selection process of multi-mode multi-band user terminal Download PDF

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CN110913459B
CN110913459B CN201911297272.1A CN201911297272A CN110913459B CN 110913459 B CN110913459 B CN 110913459B CN 201911297272 A CN201911297272 A CN 201911297272A CN 110913459 B CN110913459 B CN 110913459B
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cell
network selection
band
residence
plmn
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CN110913459A (en
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郑焕平
王华华
杨黎明
王丹
陈发堂
何云
王利
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Sanya Xiaozhen Intelligent Technology Co.,Ltd.
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Chongqing University of Post and Telecommunications
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/20Selecting an access point

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention relates to the field of mobile communication systems, in particular to a method for optimizing the network selection process of a multimode multi-band user terminal, which comprises the following steps: the NAS of the UE selects a PLMN with the highest priority according to a network selection principle, and selects a high-priority mode in the PLMN; sending a network selection request signal to the access layer of the mode; after receiving the network selection request, executing the sub-band cell selection; if the cell meeting the residence condition is not found in the mode; initiating a network selection process for the access layer of the next mode, wherein the network selection methods are the same; all access layers do not find suitable cells; then the next PLMN network selection is carried out, and the network selection process is the same; if all PLMNs do not find a suitable cell to reside, the UE tries to perform limited residence; if the cell meeting the residence condition is found, indicating that the network selection is successful; the invention preferentially selects and judges the frequency band of the cell which is resided successfully at last, thereby improving the probability of successful network selection and shortening the time of network selection.

Description

Method for optimizing network selection process of multi-mode multi-band user terminal
Technical Field
The invention belongs to the field of mobile communication systems, and particularly relates to a method for optimizing a network selection process of a multimode multi-band user side.
Background
Currently, with the continuous evolution of mobile network technology, a user terminal supporting multiple access technology modes and multiple frequency bands provides better and more stable services for users, and meanwhile, the realization of the UE is more and more complicated due to the fact that the multiple modes coexist for a long time. In a multi-network coverage scenario, a UE should quickly and accurately select and camp on a suitable cell. In a mobile communication system, a high-level protocol stack comprises an Access Stratum (AS) and a non-access stratum (NAS), wherein a Radio Resource Control (RRC) module of the access stratum mainly completes the functions of cell selection, reselection, radio access, radio resource management and the like, and the non-access stratum completes the functions of mobility management, network search, network selection and the like. In the network selection process of the multimode UE, the NAS selects the PLMN and the modes supported by the PLMN according to a network selection principle, and the AS performs cell selection according to a network selection request of the NAS, namely: an attempt is made to select the best cell on the designated PLMN and supported frequency bands that satisfies the camping condition. According to the description of the 3GPP protocol, in the case of automatic network selection, NAS selects PLMNs in order from high PLMN priority to low PLMN priority, there is no priority specified between multiple radio access technologies (modes) supported in the PLMN, and the mode priority of the multimode UE is usually implemented according to user settings, and when the user is not set, a default priority order is adopted. Therefore, in the network selection process, the PLMN is selected according to the network selection principle, and then the cells in the supported modes are sequentially selected in the selected PLMN until a cell which can reside is found.
The existing cell selection procedures are generally of two kinds: cell selection with a stored list (or cell selection with a BA table) and initial cell selection (namely cell selection of blind search) are preferentially performed, and when none of the cells of the stored list satisfies the camping condition, the initial cell selection process is performed again. Both options can select a cell that satisfies the camping condition.
However, with the increase of the supported radio frequency bands, when the UE performs the network selection task, if it is the initial cell selection, it needs to measure all the supported frequency bands, and then tries to select a suitable cell to camp on according to the measurement result, which takes a long time and complicates the selection process.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for optimizing the network selection process of a multimode multi-band user terminal, which comprises the following steps:
s1: when an automatic network selection process is triggered, the NAS of the multimode user side selects a PLMN with the highest priority level in a PLMN list to be selected according to a network selection principle, selects a high-priority mode in modes supported by the PLMN, and sends a network selection request signal to an access layer;
s2: after receiving the network selection request, the access layer AS checks whether a storage list exists in the network selection request;
if the storage list exists, the cell with the storage list is selected;
if no storage list exists, judging whether the signal contains information for performing the frequency-division searching;
s3: if the signal contains the information of the sub-band search, the sub-band cell selection is executed;
if the signal does not contain the information of the sub-band search, blind cell search selection is executed;
s4: the AS carries out cell selection on a high-priority mode in the PLMN with the highest priority;
if the cell meeting the residence condition is found, the cell residence is carried out, and the step S7 is entered;
if no cell meeting the residence condition exists, executing the next step;
s5: the AS reports the network selection failure to the NAS, and the NAS initiates a network selection process to an access layer of a sub-priority mode supported by the PLMN with the highest priority; if the cell meeting the residence condition is found, executing step S7; if all modes in the PLMN with the highest priority are selected, and the cell does not meet the residence condition, executing step S6;
s6: if the PLMN list has PLMNs which are not tried to be selected, the NAS sequentially selects the next PLMN, and returns to step S1, and if all PLMNs are executed and there are no cells which meet the camping condition, the step S8 is performed;
s7: finding out the cell meeting the residence condition, the AS indicates the success of network selection to the NAS, and the process is ended;
s8: and if the cell meeting the residence condition is not found, the user side performs limited residence.
Preferably, the storage list comprises: and (4) listing the cells which are resided successfully once, and arranging the cells which are resided successfully according to the time sequence.
Preferably, the setting of the information for performing the subband search includes: preferentially searching the frequency band where the user terminal successfully resides in the cell recently, setting frequency band information preferentially searched to represent frequency division bands, determining the frequency band where the user terminal successfully resides according to the frequency point of the resident cell, and adopting an interface parameter variable to represent the frequency band information, wherein if frequency division band operation is carried out, the information of the parameter variable is valid, and if frequency division band operation is not carried out, the information of the parameter variable is invalid.
Preferably, the sub-band cell selection step includes:
s31: the RRC of the AS sends the frequency band indicated by the sub-band information parameters to the bottom layer, requests the bottom layer to blindly search the frequency band, and simultaneously sets blind search priority frequency band records; the bottom layer performs frequency sweep measurement on the configured frequency band and sends the detected signal quality of the cell to the RRC;
s32: the RRC sequences the cells with the signal quality higher than a certain threshold from strong to weak according to the measured cell signal quality result to form a cell selection list; analyzing the system information block of the cell with the strongest signal in the list;
s33: the RRC checks whether the cell meets the residence condition according to the content of the system information block;
if the residence condition is met, cell residence is carried out;
if the residence condition is not met, trying to analyze the system information block of the next cell in the list until the cell meeting the residence condition is found, and performing cell residence; if the cells in the list are analyzed completely and no cell satisfying the camping condition is found, go to step S34;
s34: the RRC of the AS checks the frequency band blind search record, judges that only the prior frequency band is searched blindly at the moment, and then sends other frequency bands supported by the UE to the bottom layer to request the bottom layer to search other frequency bands blindly, and simultaneously the RRC sets the blind search record AS all the searched frequency bands; the bottom layer carries out blind search measurement on the configured frequency band and reports the detected signal quality of the cell to RRC, the RRC sorts the cells with the signal quality higher than a certain threshold according to the signal quality from strong to weak to form a cell selection list, and the cells are sequentially analyzed from the strongest cell and whether the system information meets the residence condition is checked; until a cell satisfying the camping condition is found or all cells have tried to find no suitable cell.
The invention optimizes the process of network selection by carrying out frequency-band search on the network selection of the user; by preferentially selecting and judging the frequency band of the cell where the cell resides successfully last, the probability of successful network selection is improved, the time for network selection is shortened, the power consumption of a user side is reduced, and the user experience is improved.
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FIG. 1 is a schematic flow diagram of the process of the present invention;
fig. 2 is a schematic flow diagram of a prior art method.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and clearly with reference to the accompanying drawings. The described embodiments are only some of the embodiments of the present invention.
The invention relates to a method for optimizing the network selection process of a multimode multiband user terminal, which comprises the following steps as shown in figure 1:
s1: when an automatic network selection process is triggered, the NAS of the multimode user side selects a PLMN with the highest priority level in a PLMN list to be selected according to a network selection principle, selects a high-priority mode in modes supported by the PLMN, and sends a network selection request signal to an access layer;
s2: after receiving the network selection request, the access layer AS checks whether a storage list exists in the network selection request;
if the storage list exists, the cell with the storage list is selected;
if no storage list exists, judging whether the signal contains information for performing the frequency-division searching;
s3: if the signal contains the information of the sub-band search, the sub-band cell selection is executed;
if the signal does not contain the information of the sub-band search, blind cell search selection is executed;
s4: the AS carries out cell selection on a high-priority mode in the PLMN with the highest priority;
if the cell meeting the residence condition is found, the cell residence is carried out, and the step S7 is entered;
if no cell meeting the residence condition exists, executing the next step;
s5: the AS reports the network selection failure to the NAS, and the NAS initiates a network selection process to an access layer of a sub-priority mode supported by the PLMN with the highest priority; if the cell meeting the residence condition is found, executing step S7; if all modes in the PLMN with the highest priority are selected, and the cell does not meet the residence condition, executing step S6;
s6: if the PLMN list has PLMNs which are not tried to be selected, the NAS sequentially selects the next PLMN, and returns to step S1, and if all PLMNs are executed and there are no cells which meet the camping condition, the step S8 is performed;
s7: finding out the cell meeting the residence condition, the AS indicates the success of network selection to the NAS, and the process is ended;
s8: if the cell meeting the residence condition is not found, the user side performs limited residence;
wherein NAS stands for the non-access layer of the upper protocol stack, PLMN stands for the network, AS stands for the access layer of the upper protocol stack.
Wherein NAS stands for the non-access layer of the upper protocol stack, PLMN stands for the network, AS stands for the access layer of the upper protocol stack.
The storage list includes: and (4) listing the cells which are resided successfully once, and arranging the cells which are resided successfully according to the time sequence.
The setting of the information for performing the subband search includes: preferentially searching the frequency band where the user terminal successfully resides in the cell recently, setting frequency band information preferentially searched to represent frequency division bands, determining the frequency band where the user terminal successfully resides according to the frequency point of the resident cell, and adopting an interface parameter variable to represent the frequency band information, wherein if frequency division band operation is carried out, the information of the parameter variable is valid, and if frequency division band operation is not carried out, the information of the parameter variable is invalid.
The sub-band cell selection step comprises:
s31: the RRC of the AS sends the frequency band indicated by the sub-band information parameters to the bottom layer, requests the bottom layer to blindly search the frequency band, and simultaneously sets blind search priority frequency band records; the bottom layer performs frequency sweep measurement on the configured frequency band and sends the detected signal quality of the cell to the RRC;
s32: the RRC sequences the cells with the signal quality higher than a certain threshold from strong to weak according to the measured cell signal quality result to form a cell selection list; analyzing the system information block of the cell with the strongest signal in the list;
s33: the RRC checks whether the cell meets the residence condition according to the content of the system information block;
if the residence condition is met, cell residence is carried out;
if the residence condition is not met, trying to analyze the system information block of the next cell in the list until the cell meeting the residence condition is found, and performing cell residence; if the cells in the list are analyzed completely and no cell satisfying the camping condition is found, go to step S34;
s34: the RRC of the AS checks the frequency band blind search record, judges that only the prior frequency band is searched blindly at the moment, and then sends other frequency bands supported by the UE to the bottom layer to request the bottom layer to search other frequency bands blindly, and simultaneously the RRC sets the blind search record AS all the searched frequency bands; the bottom layer carries out blind search measurement on the configured frequency band and reports the detected signal quality of the cell to RRC, the RRC sorts the cells with the signal quality higher than a certain threshold according to the signal quality from strong to weak to form a cell selection list, and the cells are sequentially analyzed from the strongest cell and whether the system information meets the residence condition is checked; until finding the cell meeting the staying condition or all the cells try to find no suitable cell;
here, RRC denotes radio resource control.
As shown in fig. 2, in the prior art, when a UE attempts to camp on a network after losing coverage, it attempts to search for a frequency band in which a cell that has recently camped successfully is located first, and if a suitable cell cannot be found, blind search is performed on other frequency bands supported by the cell, thereby accelerating the cell selection process of blind search.
Comparing the flows of fig. 1 and fig. 2, in fig. 1, when the network is reselected after the coverage is lost according to the cell information successfully registered by the UE last, it is preferentially tried to select the frequency band where the cell where the UE successfully resides last, and if none of the cells can reside, the cell selection for blind search of the remaining supported frequency bands is continued. The method of the invention can shorten the time delay of the blind network searching and selecting process, effectively reduce the power consumption of the UE and achieve the aim of optimizing the network selecting process.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it, and those skilled in the art can make various corresponding changes according to the method of the present invention without departing from the spirit and essence of the method of the present invention, which falls within the protection scope of the method claims of the present invention.

Claims (2)

1. A method for optimizing the network selection process of a multi-mode multi-band user terminal is characterized by comprising the following steps:
s1: when an automatic network selection process is triggered, the NAS of the multimode user side selects a PLMN with the highest priority level in a PLMN list to be selected according to a network selection principle, selects a high-priority mode in modes supported by the PLMN, and sends a network selection request signal to an Access Stratum (AS);
s2: after receiving the network selection request, the access layer AS checks whether a storage list exists in the network selection request;
if the storage list exists, the cell with the storage list is selected;
if no storage list exists, judging whether the signal contains information for performing the frequency-division searching;
the information setting of the sub-band search includes: preferentially searching the frequency band where the user terminal successfully resides in the cell recently, setting frequency band information preferentially searched to represent a frequency division band, determining the frequency band where the user terminal successfully resides according to the frequency point of the resident cell, and adopting an interface parameter variable to represent the frequency band information, wherein if frequency division band operation is carried out, the information of the parameter variable is valid, and if frequency division band operation is not carried out, the information of the parameter variable is invalid;
s3: if the signal contains the information of the sub-band search, the sub-band cell selection is executed;
if the signal does not contain the information of the sub-band search, blind cell search selection is executed;
s4: the AS completes cell selection according to the network selection request;
if the cell meeting the residence condition is found, the cell residence is carried out, and the step S7 is entered;
if no cell meeting the residence condition exists, executing the next step;
s5: the AS reports the network selection failure to the NAS, and the NAS initiates a network selection process to an access layer of a sub-priority mode supported by the PLMN with the highest priority; if the cell meeting the residence condition is found, executing step S7; if all modes in the PLMN with the highest priority are selected, and the cell does not meet the residence condition, executing step S6;
s6: if the PLMN list has PLMNs which are not tried to be selected, the NAS sequentially selects the next PLMN, and returns to step S1, and if all PLMNs are executed and there are no cells which meet the camping condition, the step S8 is performed;
s7: finding out the cell meeting the residence condition, the AS indicates the success of network selection to the NAS, and the process is ended;
s8: if the cell meeting the residence condition is not found, the user side performs limited residence;
the specific steps of sub-band cell selection include:
s31: the RRC of the AS sends the frequency band indicated by the interface parameter of the sub-band information to the bottom layer, requests the bottom layer to blindly search the frequency band, and simultaneously sets a blind search priority frequency band record; the bottom layer performs frequency sweep measurement on the configured frequency band and sends the detected signal quality of the cell to the RRC;
s32: the RRC sequences the cells with the signal quality higher than a certain threshold from strong to weak according to the measured cell signal quality result to form a cell selection list; analyzing the system information block of the cell with the strongest signal in the list;
s33: the RRC checks whether the cell meets the residence condition according to the content of the system information block;
if the residence condition is met, cell residence is carried out;
if the residence condition is not met, trying to analyze the system information block of the next cell in the list until the cell meeting the residence condition is found, and performing cell residence; if the cells in the list are analyzed completely and no cell satisfying the camping condition is found, go to step S34;
s34: the RRC of the AS checks the frequency band blind search record, judges that only the prior frequency band is searched blindly at the moment, and then sends other frequency bands supported by the UE to the bottom layer to request the bottom layer to search other frequency bands blindly, and simultaneously the RRC sets the blind search record AS all the searched frequency bands; the bottom layer carries out blind search measurement on the configured frequency band and reports the detected signal quality of the cell to RRC, the RRC sorts the cells with the signal quality higher than a certain threshold according to the signal quality from strong to weak to form a cell selection list, and the cells are sequentially analyzed from the strongest cell and whether the system information meets the residence condition is checked; until finding the cell meeting the staying condition or all the cells try to find no suitable cell;
wherein NAS stands for the non-access stratum of the upper protocol stack, PLMN stands for the network, AS stands for the access stratum of the upper protocol stack, RRC stands for the radio resource control.
2. The method of claim 1, wherein the stored list comprises: and (4) listing the cells which are resided successfully once, and arranging the cells which are resided successfully according to the time sequence.
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CN114339952B (en) * 2020-09-29 2023-07-25 紫光展锐(重庆)科技有限公司 Multimode terminal communication method and communication device
CN112637918B (en) * 2021-01-05 2023-03-14 上海微波技术研究所(中国电子科技集团公司第五十研究所) Network priority selection method, terminal and system for terminal in NR (noise-and-noise) shared network

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