CN112887996B - Method for optimizing paging message strategy of wireless access network - Google Patents
Method for optimizing paging message strategy of wireless access network Download PDFInfo
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- CN112887996B CN112887996B CN202110082590.7A CN202110082590A CN112887996B CN 112887996 B CN112887996 B CN 112887996B CN 202110082590 A CN202110082590 A CN 202110082590A CN 112887996 B CN112887996 B CN 112887996B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
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- H—ELECTRICITY
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Abstract
The invention provides a method for optimizing a paging message strategy of a wireless access network, which is characterized by comprising the following steps: step 1, when user equipment is in an RRC inactive state, a gNB serving at last sends radio access network paging information to the user equipment; step 2, the user equipment receives the paging information and sends an RRC recovery request to the new gNB, which indicates that the new gNB pages the user equipment; step 3, the new gNB receives the user equipment recovery request and allows the user equipment to enter an RRC connection state; step 4, the serving gNB acquires path information when the user equipment is in an RRC inactive state and an RRC connected state; step 5, the new gNB acquires the paging path information of the user equipment in the RRC inactive state according to the path information acquired in the step 4; step 6, the new gNB pages according to the RNA region or the adjacent gNB corresponding to the paging path information to determine a paging strategy of the radio access network; and 7, the serving gNB sends the paging information of the radio access network to the user equipment according to the paging strategy.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for optimizing a paging message strategy of a wireless access network.
Background
RRC INACTIVE state is introduced in 5G NR (New Radio), for UE entering RRC INACTIVE state, the gNB providing service for the UE finally stores UE context information, and configures an RNA (RAN Notification area) area, and the UE can perform cell selection and reselection in the RNA area and perform periodic and event RAN Update. When downlink service of the UE reaches or a periodic Update protection timer of the gNB expires and the RAN Update of the UE is not received, the gNB initiates a RAN Paging to inform the UE to initiate a Resume flow to recover RRC connection to enter an RRC CONNECT state. The RAN Paging not only needs to occupy the PCCH channel resource of the cell, but also needs to transmit on the Xn interface, and a large amount of RAN Paging causes a signaling storm of the Xn interface and easily causes the PCCH channel congestion of the RNA region cell. The frequency of initiating the RAN Paging by the gNB is strongly related to the configuration of the RNA region, the number of UEs entering RRC INACTIVE state in the RNA region, and the policy of Paging. The current strategy of RAN ranging is generally to page the whole RNA region or all adjacent gnbs, and this way Paging has an excessively large range, which causes unnecessary signaling overhead of Xn interface and waste of PCCH channel resources.
The existing solution idea is to solve the problem for the terminal configuration side through RRC signaling by configuring an RNA region for the UE, configure a reporting threshold for RNA assistance information through an RRC signaling terminal, and reasonably configure RNA through reporting RNA assistance information by the terminal, which depends on a protocol and support of the terminal, and even if the RAN region is configured reasonably, if the Paging range is too large, the RAN Paging overhead is still too large.
The Chinese invention of the notice number CN107613562A discloses a paging method and a device, and the method comprises the following steps: when determining to send a Paging message to target User Equipment (UE), a base station eNB acquires a target coverage level corresponding to a target equipment identifier of the target UE according to a pre-stored corresponding relationship between the equipment identifier and the coverage level; the eNB determines a target paging strategy corresponding to the target coverage level according to a corresponding relation between the pre-stored coverage level and the paging strategy; the eNB sends Paging information to the target UE according to the target Paging strategy, the invention improves the success rate of Paging the target UE, and can achieve the purpose of saving energy for the target UE, but has the following defects: the correct receiving of the paging message cannot be ensured, the missing paging is reduced, and the accuracy of the paging user equipment cannot be improved.
Disclosure of Invention
The invention aims to provide a method which can overcome the problems in the prior art and reduce paging signaling of an Xn interface and PCCH channel overhead by optimizing a RAN side paging strategy.
The method comprises the following steps:
step 1, when a user equipment is in an RRC (Radio Resource Control) inactive state, a gNB (5G base station) serving last sends Radio access network paging information to the user equipment;
step 2, the user equipment receives the paging information of the radio access network and sends an RRC recovery request to the new gNB, which indicates that the new gNB successfully pages the user equipment; the UE does not receive the notification containing the paging information of the radio access network, and the new gNB does not receive the RRC recovery request, indicating that the new gNB does not page the UE;
step 3, the new gNB receives the UE recovery request and allows the UE to enter an RRC connection state;
step 4, the serving gNB acquires path information when the UE is in an RRC (radio resource control) inactive state according to a context recovery request periodically initiated by the UE, and acquires path information when the UE is in an RRC connected state according to the UE history information carried by the UE during access and cut-in;
step 5, the new gNB acquires the paging path information of the user equipment in the RRC non-activated state according to the path information of the user equipment in the RRC non-activated state and in the RRC connected state;
step 6, the new gNB pages according to the RNA region or the adjacent gNB corresponding to the paging path information to determine a radio access network paging strategy;
and 7, the last serving gNB executes sending radio access network paging information to the user equipment according to the radio access network paging strategy.
Further, the step 1 of the radio access network paging information includes: and the last serving gNB informs the user equipment of the radio network temporary identifier allocated when the user equipment enters an inactive state.
Further, before the last serving gNB of step 1 sends the radio access network paging information to the ue, the method includes:
and judging whether downlink service of the user equipment arrives or whether a periodic update protection timer of the last serving gNB is overtime and does not receive an RNA update prompt of the user equipment.
Further, the path information when the ue is in the RRC inactive state in step 4 specifically includes:
step 4.1, the new gNB receives the RRC recovery request and finds the context of the user equipment, wherein the context of the user equipment comprises a user wireless side security key, established signaling and data bearing, PDU conversation and Qos flow information, and acquires the cell information of the RRC recovery request; or
And 4.2, the new gNB receives the Xn interface and retrieves the context request of the user equipment, and stores the context request as the new cell identifier information.
Further, in step 4, the manner of collecting the path information when the ue is in the RRC inactive state and the path information when the ue is in the RRC connected state is specifically an incremental recording manner, and the incremental recording manner ranks the cell information according to the occurrence time sequence, where a newly-occurring cell is the most preferred, so as to count the occurrence times/residence time of each cell.
Further, the path information when the ue is in the RRC connected state in step 5 is specifically:
and collecting when the user equipment is switched, and using the user equipment to carry information elements through the history information of the user equipment, wherein the information elements comprise all the cell information and residence time of the history residence of the user equipment.
Further, the handover of the ue in step 5 is specifically intra-station handover, Xn handover, NG handover.
Further, the step 5 includes the following steps: paging gNB and cell list information.
Further, in step 6, the paging of the new gNB according to the RNA region or the adjacent gNB corresponding to the paging path information specifically includes: and the new gNB pages according to the paging times, the gNB paged each time and the RNA region corresponding to the cell list or the adjacent gNB.
Further, the radio access network paging strategy in step 6 specifically includes normal paging and extended paging; the paging frequency of the normal paging is 1 time, and the paging range is a cell in which the user equipment performs RNA for the last time; the paging frequency of the extended paging is 2 times, and the paging range is the range of gradually expanding the paging when the paging response is not received each time; the extended paging specifically includes: the method comprises the steps of inactive state path extended paging and historical resident path extended paging, wherein the inactive state path extended paging is sequenced according to the occurrence time and residence time/occurrence times of cells, the previous N configurable cells are selected from RRC inactive state paging paths of the user equipment for paging, and the historical resident path extended paging is paged according to all cells included by the paging paths of the user equipment in an RRC inactive state and an RRC connected state.
Further, step 6, the radio access network paging strategy further includes: deep paging;
the paging frequency of the deep paging is 2 times, and the paging range of each time is all service cells of adjacent gNB establishing Xn with the current gNB.
Further, the step 7 of the serving gNB performing, according to the radio access network paging policy, sending a radio access network paging message to the user equipment specifically includes:
when the paging strategy of the user equipment is normal paging, initiating a radio access network paging message flow according to a normal paging range, and after a paging timer is overtime, if a recovery request of the user equipment is not received or a context request of the user equipment is retrieved, indicating that the normal paging fails, continuing to initiate extended paging, and if the extended paging fails, continuing to initiate deep paging.
Further, the step 7 of the serving gNB performing, according to the radio access network paging policy, sending a radio access network paging message to the user equipment specifically includes:
when the paging strategy of the user equipment is extended paging, initiating a radio access network paging message flow according to an extended paging range, and after a paging timer is overtime, not receiving a recovery request of the user equipment or retrieving a context request of the user equipment, indicating that the extended paging fails and initiating deep paging.
The invention has the following beneficial effects:
1. the method of the invention can reduce the paging signaling overhead of the Xn interface and the PCCH channel overhead by optimizing the RAN side paging strategy, thereby effectively avoiding resource waste.
2. The method of the invention adopts the increment recording mode for the user equipment in the RRC non-activated state, which can ensure the correct receiving of the paging message and reduce the missing paging.
3. The method of the invention can improve the accuracy of paging the user equipment.
Drawings
FIG. 1 is a schematic flow chart of the steps of the method of the present invention;
fig. 2 is a schematic diagram illustrating the interaction between the ue and the new gNB and the last serving gNB in the method of the present invention;
fig. 3 is a schematic diagram illustrating the interaction between the ue and the last serving gNB in the method of the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, reference will now be made in detail to the present disclosure as illustrated in the accompanying drawings and described in the following detailed description.
The method comprises the following steps:
step 1, when user equipment is in an RRC inactive state, a gNB serving at last sends radio access network paging information to the user equipment;
before step 1, the method further includes determining whether downlink traffic of the ue arrives or whether a periodic update guard timer of a last serving gNB expires and an RNA update prompt of the ue is not received.
Step 2, the user equipment receives the paging information of the radio access network and sends an RRC recovery request to the new gNB, which indicates that the new gNB successfully pages the user equipment; and if the user equipment does not receive the notification containing the paging information of the radio access network and the new gNB does not receive the RRC recovery request, indicating that the new gNB does not page the user equipment.
And step 3, the new gNB receives the user equipment recovery request and allows the user equipment to enter the RRC connection state.
Step 4, the serving gNB acquires path information when the UE is in an RRC (radio resource control) inactive state according to a context recovery request periodically initiated by the UE, and acquires path information when the UE is in an RRC connected state according to historical information of the UE carried by the UE during access and cut-in;
step 4.1, the new gNB receives the RRC recovery request and finds the context of the user equipment, the context of the user equipment comprises the user wireless side security key, the established signaling and data bearing, the PDU session, the Qos flow information and the like, and the cell information of the RRC recovery request is obtained; or
And 4.2, the new gNB receives the context request of the Xn interface retrieval user equipment and stores the context request as the new cell identifier information.
And 4.3, specifically, the mode of acquiring the path information when the user equipment is in the RRC inactive state and the mode of acquiring the path information when the user equipment is in the RRC connected state is an incremental recording mode, the incremental recording mode sorts the cell information according to the occurrence time sequence, the latest cell is the most preferred, and the occurrence times/residence time of each cell is counted.
Step 5, the new gNB acquires the paging path information of the user equipment in the RRC non-activated state according to the path information of the user equipment in the RRC non-activated state and in the RRC connected state;
step 5.1, when the user equipment is in the RRC connection state, the path information specifically is: collecting when the user equipment is switched, and using the user equipment to carry the cell through the history information of the user equipment, wherein the cell comprises all the cell information and residence time of the user equipment;
step 5.2, the user equipment is specifically switched into intra-station switching, Xn switching and NG switching;
step 5.3, the paging path information includes paging gNB and cell list information.
Step 6, the new gNB pages according to the RNA region or the adjacent gNB corresponding to the paging path information to determine a paging strategy of the radio access network;
step 6.1, the radio access network paging strategy comprises the number of paging times, gNB and cell list of each paging;
step 6.2, the paging of the new gNB according to the RNA region or the adjacent gNB corresponding to the paging path information specifically comprises: the new gNB pages according to the paging times, the gNB paged each time and the RNA region corresponding to the cell list or the adjacent gNB;
step 6.3, the paging strategy of the wireless access network specifically comprises normal paging and extended paging; the extended paging specifically comprises inactive state path extended paging and historical dwell path extended paging, the inactive state path extended paging is sequenced according to the occurrence time and dwell time/occurrence times of cells, the front N configurable cells are selected from RRC inactive state paging paths of the user equipment for paging, and the historical dwell path extended paging is paged according to all cells included by the paging paths of the user equipment in the RRC inactive state and the RRC connected state; the paging frequency of normal paging is 1 time, and the paging range is a cell in which the user equipment performs RNA for the last time; the paging frequency of the extended paging is 2 times, and the paging range is a range according to which the paging is gradually extended each time the paging response is not received.
And step 6.4, the radio access network paging strategy also comprises deep paging, the number of times of deep paging is 2, and each paging range is all service cells of adjacent gNB establishing Xn with the current gNB.
Step 7, the serving gNB executes sending radio access network paging information to the user equipment according to the radio access network paging strategy;
step 7.1, the step of the served gNB sending the radio access network paging message to the user equipment according to the radio access network paging strategy specifically comprises:
when the paging strategy of the user equipment is normal paging, initiating a radio access network paging message flow according to a normal paging range, and still not receiving a recovery request of the user equipment or a context request of retrieving the user equipment after a paging timer is overtime, indicating that the normal paging fails, continuing to initiate extended paging, failing to expand the paging, and continuing to initiate deep paging;
step 7.2, the step of the serving gNB sending the radio access network paging message to the user equipment according to the radio access network paging strategy specifically includes:
when the paging strategy of the user equipment is extended paging, a radio access network paging message flow is initiated according to the extended paging range, and after the paging timer is overtime, a recovery request of the user equipment or a context request for retrieving the user equipment is not received, which indicates that the extended paging is failed, and deep paging is initiated.
Further preferably, when the last serving gNB receives the downlink data arrival prompt of the ue, the paging policy initiated by the ue is normal paging, and the extended paging is started when the normal paging is unsuccessful for one paging.
Further preferably, when the last serving gNB receives a downlink NAS signaling arrival prompt of the user equipment, the paging policy initiated by the user equipment is normal paging, and the extended paging is started when the normal paging is not successfully paged once.
Further preferably, when the serving gbb receives an RNA update protection timer timeout indication of the ue, the paging policy initiated by the ue is extended paging.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for optimizing paging message policy in a radio access network, the method comprising:
step 1, when a user equipment is in an RRC (Radio Resource Control) inactive state, a gNB (5G base station) serving last sends Radio access network paging information to the user equipment;
step 2, the user equipment receives the paging information of the radio access network and sends an RRC recovery request to a new gNB, which indicates that the new gNB successfully pages the user equipment; the UE does not receive the notification containing the paging information of the radio access network, and the new gNB does not receive the RRC recovery request, indicating that the new gNB does not page the UE;
step 3, the new gNB receives the UE recovery request and allows the UE to enter an RRC connection state;
step 4, the serving gNB acquires path information when the UE is in an RRC (radio resource control) inactive state according to a context recovery request periodically initiated by the UE, and acquires path information when the UE is in an RRC connected state according to the UE history information carried by the UE during access and cut-in;
step 5, the new gNB acquires the paging path information of the user equipment in the RRC inactive state according to the path information of the user equipment in the RRC inactive state and in the RRC connected state;
step 6, the new gNB pages according to the RNA region or the adjacent gNB corresponding to the paging path information to determine a radio access network paging strategy;
and 7, the last serving gNB sends the radio access network paging information to the user equipment according to the radio access network paging strategy.
2. The method of claim 1, wherein the radio access network paging message policy optimization of step 1 comprises: and the last serving gNB informs the user equipment of the radio network temporary identifier allocated when the user equipment enters an inactive state.
3. The method of claim 1, wherein before the last serving gNB sends a radio access network paging notification to the UE in step 1, the method comprises:
and judging whether downlink service of the user equipment arrives or whether a periodic update protection timer of the last serving gNB is overtime and does not receive an RNA update prompt of the user equipment.
4. The method for optimizing paging message strategy in radio access network according to claim 1, wherein the path information in step 4 when the ue is in RRC inactive state specifically includes:
step 4.1, the new gNB receives the RRC recovery request and finds the context of the user equipment, wherein the context of the user equipment comprises a user wireless side security key, established signaling and data bearing, PDU conversation and Qos flow information, and acquires the cell information of the RRC recovery request; or alternatively
And 4.2, the new gNB receives the Xn interface to retrieve the context request of the user equipment and stores the context request as the information of the new cell identifier.
5. The method for optimizing paging message strategy of radio access network according to claim 1, wherein the manner of collecting the path information when the ue is in the RRC inactive state and the path information when the ue is in the RRC connected state in step 4 is specifically an incremental recording manner, and the incremental recording manner is to sort the cell information according to the appearance time sequence, where the latest cell is the most preferred cell, so as to count the appearance times/residence time of each cell.
6. The method for optimizing paging message strategy in radio access network according to claim 1, wherein the path information in step 5 when the ue is in RRC connected state is specifically:
and collecting when the user equipment is switched, and enabling the user equipment to pass through a cell carried by the historical information of the user equipment, wherein the cell comprises all the cell information and residence time of the historical residence of the user equipment.
7. The method for optimizing paging message strategy of radio access network according to claim 1, wherein step 5 said ue is handed over, specifically intra-site handover, Xn handover, NG handover; the paging path information includes: paging gNB and cell list information.
8. The method for optimizing paging message strategy of radio access network according to claim 1, wherein in step 6, the paging of the new gNB according to the RNA region or the adjacent gNB corresponding to the paging path information specifically comprises: and the new gNB pages according to the paging times, the gNB paged each time and the RNA region corresponding to the cell list or the adjacent gNB.
9. The method for optimizing radio access network paging message strategy according to claim 1, wherein the radio access network paging strategy of step 6 specifically includes normal paging and extended paging; the paging frequency of the normal paging is 1 time, and the paging range is a cell in which the user equipment performs RNA for the last time; the paging frequency of the extended paging is 2 times, and the paging range is the range of gradually expanding the paging when the paging response is not received each time; the extended paging specifically includes: the method comprises the steps that path expansion paging in an inactive state and historical resident path expansion paging are conducted, the path expansion paging in the inactive state is sequenced according to the occurrence time and residence time/occurrence times of cells, the front N configurable cells are selected from RRC inactive state paging paths of user equipment to conduct paging, and the historical resident path expansion paging conducts paging according to all cells included by the paging paths of the user equipment in an RRC inactive state and an RRC connected state; said step 6 said radio access network paging strategy further comprises deep paging: the paging frequency of the deep paging is 2 times, and the paging range of each time is all service cells of adjacent gNB establishing Xn with the current gNB.
10. The method of claim 1, wherein the step 7 of executing, by the serving gNB according to the radio access network paging policy, sending the radio access network paging message to the ue specifically comprises: when the paging strategy of the user equipment is normal paging, initiating a radio access network paging message flow according to a normal paging range, and if a paging timer is overtime and a recovery request of the user equipment is not received or a context request of the user equipment is retrieved, indicating that the normal paging fails, continuing to initiate extended paging, and if the extended paging fails, continuing to initiate deep paging; the step of the serving gbb sending the radio access network paging message to the user equipment according to the radio access network paging policy specifically includes: when the paging strategy of the user equipment is extended paging, initiating a radio access network paging message flow according to an extended paging range, and after a paging timer is overtime, if a recovery request of the user equipment is not received or a context request of the user equipment is not retrieved, indicating that the extended paging is failed, and initiating deep paging.
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