CN110049577B - Method and device for reestablishing Radio Resource Control (RRC) - Google Patents

Method and device for reestablishing Radio Resource Control (RRC) Download PDF

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CN110049577B
CN110049577B CN201810036826.1A CN201810036826A CN110049577B CN 110049577 B CN110049577 B CN 110049577B CN 201810036826 A CN201810036826 A CN 201810036826A CN 110049577 B CN110049577 B CN 110049577B
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base station
reestablishment
rrc
message
msg4
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CN110049577A (en
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程岳
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

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Abstract

The application discloses a method and a device for reestablishing Radio Resource Control (RRC), wherein the method for reestablishing the RRC by a User Equipment (UE) after the RRC connection fails comprises the following steps: a reestablishment base station receives a reestablishment request message sent by UE; the request message comprises an EnodeB Id of a source resident base station corresponding to the UE; acquiring a global identifier of a neighbor base station from locally configured neighbor information, and matching an EnodeB Id with the global identifier of the neighbor base station; determining the source residing base station from the adjacent base stations; and sending an X2 interface message to the source resident base station to request the context information of the UE, and triggering the source resident base station to send the context information to the reestablished cell on the reestablishing base station through the X2 interface message to realize RRC reestablishment. The method and the device provided by the application reduce the time delay of RRC reestablishment, and reduce the system overhead and the processing complexity of RRC reestablishment.

Description

Method and device for reestablishing Radio Resource Control (RRC)
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for RRC reestablishment.
Background
In an existing LTE (Long Term Evolution) communication system, a UE (User Equipment) fails in RRC (Radio Resource Control) connection, and further, if any one of a failure in a base station handover process, a failure in verifying integrity of User context information, and a failure in RRC connection reconfiguration occurs, an RRC connection state is abnormal, and it is necessary to reestablish an RRC connection, so that it is ensured that communication between the UE and the base station continues. The current process of base station re-establishment is as follows (as shown in fig. 1):
step 101, after receiving the reestablishment request message, the reestablishment base station searches the UE index in the base station, the UE initiates reestablishment and carries the phyid of the source cell and the CRNT-I, shortMAC-I of the UE in the source cell, the base station queries the context of the UE in the base station after receiving the message, if the query is successful, the base station returns the context (including the security parameters) of the UE to send the RRC reestablishment message to the UE, and the process is ended.
Step 102, if the query fails, according to the prior art specification, a potential source base station where the source serving cell is located (the source base station is a base station where the UE is served before re-establishment in a steady state; the source base station where the UE is served before re-establishment in a handover process; the re-establishment base station is a base station where the UE is served before re-establishment) may be requested through an X2 interface message (e.g., RLF Indication, etc.): and triggering the source cell to send the UE context to the reestablished cell on the reestablished base station through an X2 interface message (Handover Request). The source base station selection method for the reestablishment base station to send the RLF Indication message comprises the following steps:
and matching rows in the neighbor relation table according to the PCI carried in the reestablishment request message and the target base station with the X2 link. If a plurality of base stations which have established an X2 link with the base station are found, the found N adjacent base stations are required to be used as target stations for sending the context request. And then transmitting RLF Indication messages to the selected N adjacent base stations. And starting a waiting UE context timer after the first RLF Indication message is sent, wherein the timer can be dynamically configured, the proposed duration is less than T301, and the proposed value is (T301-100 ms).
103, performing switching admission judgment and sending an RRC reestablishment rejection message; the specific implementation can be as follows:
receiving a handover request message before the timer is overtime, performing handover admission judgment, and stopping the timer; and if the timer is overtime and the handover request message is not received, clearing the timer, sending an RRC reestablishment rejection message to the UE, and directly discarding the message if the handover request message is received. And if the timer overtime message is received after the handover requests message is received, discarding the timer overtime message.
After sending RRC reestablishment information to the UE, directly discarding the message when receiving handover request information; and after receiving the switching request message sent by the source base station, the reestablishing base station carries out switching admission control according to the existing X2 switching process, and replies an ACK message after successful admission. If the re-establishment base station judges that the admission fails, replying a HANDOVER response message to the source base station, and simultaneously sending a re-establishment rejection message to the UE. The reestablishment base station may send an RRC reestablishment message to the UE after completing the handover admission reply ACK.
Step 104, after receiving the reconfiguration complete message after the successful re-establishment, the base station sends a path switching request to the MME. And sending a context release message to the source station after receiving the path switching success command.
According to the description of step 102 in the prior art, it can be determined that when the reestablishment base station matches the target base station having the X2 link in the neighbor relation table according to the PCI carried in the reestablishment request message, the target base station may match N (N >1) base stations, and therefore it is necessary to send an X2 message to multiple neighbor base stations to obtain the UE context information, and therefore the following disadvantages exist:
the random query mode of sending the X2 message to a plurality of neighboring base stations prolongs the time of reestablishment, and additionally increases the system overhead and processing complexity. All base stations receiving the X2 message need to search the context in all cells in the station, and those neighboring base stations without UE context do unnecessary query operation, resulting in unnecessary overhead of the system. In a hotspot networking area, the number of adjacent base stations is large, and when reconstruction occurs, the system efficiency is seriously influenced by the mode of broadcasting message query on an X2 link.
Disclosure of Invention
The application provides a method and a device for RRC reestablishment, which are used for solving the technical problems that in the prior art, the RRC reestablishment is prolonged, and the system overhead and the processing complexity are additionally increased.
In a first aspect, the present application provides a method for RRC reestablishment of radio resource control, where performing RRC reestablishment after an RRC connection failure by a user equipment UE includes:
a reestablishment base station receives a reestablishment request message sent by the UE; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE;
the reestablishment base station acquires the global identification of the neighbor base station from the locally configured neighbor cell information, and matches the EnodeB Id with the global identification of the neighbor base station; determining the source residing base station from the adjacent base stations;
and sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment.
In one possible implementation, the receiving, by the reestablishment base station, the reestablishment request message sent by the UE includes:
determining that the MSG3 containing the reestablishment request message is received at the MAC protocol layer, and setting the waiting time;
if the RRC reestablishment message of the RRC layer is received before the waiting time is overtime, the MSG4 containing the competition resolving and RRC reestablishment messages is sent to the UE;
if the waiting time is over and the RRC reestablishment message of the RRC layer is not received, sending a competition resolving message MSG4 to the UE, wherein the MSG4 does not contain the RRC reestablishment message; and sends an RRC reestablishment message after receiving MSG4ACK or MSG4 reaches the maximum number of retransmissions.
In one possible embodiment, the determining that the MSG3 containing the reestablishment request message was received at the MAC protocol layer includes:
and judging whether the SRB0 data in the MSG3 are all the first values, if not, judging whether the set bit in the SRB0 data is the second value, and if not, determining that the MSG3 containing the reestablishment request message is received at a MAC protocol layer.
In one possible embodiment, the waiting time is a difference between a contention resolution timer duration and a contention resolution reestablishment message transmission duration.
In a second aspect, a method for RRC reestablishment of radio resource control is provided, where performing RRC reestablishment after an RRC connection failure by a user equipment UE includes:
the UE sends a reestablishment request message to a reestablishment base station; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE; enabling the reestablishment base station to acquire a global identity of an adjacent base station from locally configured adjacent cell information, and matching the EnodeB Id with the global identity of the adjacent base station; determining the source residing base station from the adjacent base stations; and sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment.
In a possible implementation manner, before the UE sends the reestablishment request message to the reestablishment base station, the method further includes:
the UE acquires cell information of a last visited cell from locally stored mobility history information;
and taking the first 20 bits of the cellGlobalid in the cell information as the global identity EnodeB Id of the source residing base station.
In a third aspect, a base station is provided, including:
a receiving unit, configured to receive a reestablishment request message sent by a user equipment UE after an RRC connection fails; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE;
the matching unit is used for acquiring the global identifier of the adjacent base station from locally configured adjacent cell information and matching the EnodeB Id with the global identifier of the adjacent base station; determining the source residing base station from the adjacent base stations;
an information obtaining unit, configured to send an X2 interface message to the source-residing base station to request context information of the UE, and trigger the source-residing base station to send the context information to a cell reestablished on the base station through an X2 interface message to implement RRC reestablishment.
In a possible implementation manner, the receiving unit is specifically configured to determine that MSG3 including a reestablishment request message is received at a MAC protocol layer, and set a waiting time; if the RRC reestablishment message of the RRC layer is received before the waiting time is overtime, the MSG4 containing the competition resolving and RRC reestablishment messages is sent to the UE; if the waiting time is over and the RRC reestablishment message of the RRC layer is not received, sending a competition resolving message MSG4 to the UE, wherein the MSG4 does not contain the RRC reestablishment message; and sends an RRC reestablishment message after receiving an MSG4ACK or MSG4 reaches the maximum number of retransmissions.
In a possible implementation manner, the receiving unit is further configured to determine whether all SRB0 data in the MSG3 are the first value, if not, determine whether a set bit in the SRB0 data is the second value, and if not, determine that the MSG3 including the reestablishment request message is received at the MAC protocol layer.
In one possible embodiment, the waiting time is a difference between a contention resolution timer duration and a contention resolution reestablishment message transmission duration.
In a fourth aspect, a user terminal is provided, which includes:
a sending unit, configured to send a reestablishment request message to a reestablishment base station after the RRC connection fails; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE; enabling the reestablishment base station to acquire a global identity of an adjacent base station from locally configured adjacent cell information, and matching the EnodeB Id with the global identity of the adjacent base station; determining a source residing base station from the adjacent base stations; sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment;
and the receiving unit is used for receiving the RRC reestablishment message sent by the reestablishment base station.
In a possible implementation, the user terminal further includes:
an obtaining unit, configured to obtain cell information of a cell visited last time from mobility history information locally stored by the UE; and taking the first 20 bits of the cellGlobalid in the cell information as the global identity EnodeB Id of the source residing base station.
In a fifth aspect, the present application further provides a computing device comprising:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the method of any one of the possible embodiments of the first aspect or the second aspect by executing the instructions stored by the memory using the communication interface.
In a sixth aspect, the present application provides a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the method of any one of the possible implementations of the first or second aspect.
The beneficial effect of this application is as follows:
the method and the device provided by the embodiment of the application enable the base station receiving the request message to quickly search the source resident cell to initiate the process of acquiring the UE context and ensure the success rate of the re-access by adding the global identifier of the source resident base station in the request message of the RRC re-establishment.
Drawings
Fig. 1 is a schematic flow chart of a base station reestablishment in the prior art;
fig. 2 is a flowchart illustrating a method for RRC reestablishment according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a processing method of a reestablishment base station when receiving a reestablishment request message at an MAC protocol layer according to an embodiment of the present application;
fig. 4 is a flowchart illustrating another RRC reestablishment method according to an embodiment of the present application;
fig. 5 is a flowchart illustrating a method for obtaining a global identifier of a source-camping base station according to an embodiment of the present application;
FIG. 6 is a schematic flow chart illustrating the use of the method provided by the embodiments of the present application in a specific example;
fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a user terminal according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a computing device according to an embodiment of the present application.
Detailed Description
In the prior art, when the reestablishment base station matches the target base station having the X2 link with the local station in the neighboring cell relationship table according to the PCI carried in the reestablishment request message, N (N >1) base stations may be matched, so that it is necessary to send an X2 message to multiple neighboring base stations to obtain the UE context information, and send an X2 message to multiple neighboring base stations, which prolongs the reestablishment time and additionally increases the system overhead and processing complexity. Therefore, how to accurately and effectively select the source-camped cell becomes a key for reducing the time delay of reestablishing the RRC connection.
According to the above problem, an embodiment of the present application provides a method for RRC reestablishment of radio resource control, where performing RRC reestablishment after an RRC connection failure by a user equipment UE includes:
a reestablishment base station receives a reestablishment request message sent by UE; the request message comprises a global identity EnodeB Id of a UE source resident base station;
the reestablishment base station acquires the global identification of the neighbor base station from the locally configured neighbor cell information, and matches the EnodeB Id with the global identification of the neighbor base station; determining the source residing base station from the adjacent base stations;
and sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment.
According to the embodiment of the application, the global identifier of the source resident base station is added in the request message of RRC reestablishment, so that the base station receiving the request message can quickly search the source resident cell to initiate the process of acquiring the UE context and ensure the success rate of the reconnection.
The method and apparatus provided by the embodiments of the present application are further described in detail below with reference to the accompanying drawings and specific application scenarios:
example one
The method for RRC reestablishment of radio resource control according to the embodiment of the present application is described in further detail below with reference to fig. 2 in the description, where the method provided by the embodiment of the present application is used for RRC reestablishment by a UE after an RRC connection failure occurs, and the specific implementation of the method may include the following steps:
step 201, a reestablishment base station receives a reestablishment request message sent by a UE; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE;
step 202, a reestablishing base station acquires a global identity of a neighbor base station from locally configured neighbor cell information, and matches the EnodeB Id with the global identity of the neighbor base station; determining a source residing base station from the adjacent base stations;
step 203, sending an X2 interface message to the source-residing base station to request the context information of the UE, and triggering the source-residing base station to send the context information to the reestablishing cell on the reestablishing base station through an X2 interface message to implement RRC reestablishment.
Further, since the reestablishment process relates to a process of requesting a context message from a cell where the user source base station is located, and there is instability in the time delay of the message transmitted on the X2 link, the time point when the target cell sends the RRC reestablishment message is later, and it is easy for a problem that the sending time of the downlink RRC reestablishment message is longer than the contention resolution time during reestablishment, which causes reestablishment failure due to contention resolution failure, thereby causing call drop. Therefore, in the embodiment of the present application, when the reestablishment across the base stations occurs, the contention resolution message (MSG4) for the random access in such a scenario and the RRC reestablishment message are separately processed when being sent. The processing method of the reestablishment base station when receiving the reestablishment request message at the MAC protocol layer is as follows (as shown in fig. 3):
step 301, the reestablishment base station determines that the MSG3 containing the reestablishment request message is received at the MAC protocol layer, and sets a waiting time;
in the MSG3, the normal SRB0 data is either an RRC establishment request or an RRC reestablishment request, and in actual application, different data may correspond to different requests. The method for determining whether the MSG3 includes the reestablishment request message may be that, it is determined whether all SRB0 data in the MSG3 are the first value (0), if not, it is determined whether a set bit (data upper 3bit) in the SRB0 data is the second value (may be 2), and if not, it is determined that the MSG3 including the reestablishment request message is received at the MAC protocol layer.
Wherein the waiting time is a difference value (a default value may be 15ms) between a contention resolution timer duration and a contention resolution message transmission reestablishment duration.
Step 302, if receiving the RRC reestablishment message of the RRC layer before the waiting time is overtime, sending MSG4 including contention resolution and RRC reestablishment message to the UE;
step 303, if the waiting time is exceeded and the RRC reestablishment message of the RRC layer is not received, sending a contention resolution message MSG4 to the UE, where the MSG4 does not include the RRC reestablishment message; and sends an RRC reestablishment message after receiving an MSG4ACK or MSG4 reaches the maximum number of retransmissions.
Through the scheme of the embodiment, the contention resolution message can be sent to the UE before the contention resolution timer is overtime, so that the success of contention resolution during RRC reestablishment is ensured, and then the RRC reestablishment message is taken as a common signaling and sent to the UE. In this embodiment, the contention resolution message MSG4 and the RRC reestablishment message are separately sent when the RRC is reestablished, so that the sending of the RRC connection RRC reestablishment message is no longer limited by the duration of the contention resolution timer, and the delay requirement for acquiring the UE context from the reestablishment base station to the source residing base station is alleviated. The problem that the sending time of the downlink RRC reestablishment message is longer than the competition solving time during reestablishment, so that the competition solving fails, the reestablishment fails and the call is dropped is solved.
Example two
As shown in fig. 4, based on the implementation flow of the terminal side, another method for controlling RRC reestablishment by radio resource is also applied, where performing RRC reestablishment by the user equipment UE after an RRC connection failure includes:
step 401, UE sends a reestablishment request message to a reestablishment base station; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE; enabling the reestablishment base station to acquire a global identity of an adjacent base station from locally configured adjacent cell information, and matching the EnodeB Id with the global identity of the adjacent base station; determining a source resident base station which is only corresponding to the UE from the adjacent base stations; and sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment.
Step 402, the UE receives an RRC reestablishment message sent by the reestablishment base station, and sends a reestablishment completion message to the reestablishment base station.
In this embodiment of the present application, before the UE sends the reestablishment request message to the reestablishment base station, it is further required to acquire the global identifier of the source-camped base station, and a specific implementation manner may be (as shown in fig. 5):
step 501, UE obtains cell information of a last visited cell from mobility history information stored locally;
in the 3GPP TS 36.331 protocol, the UE side stores mobility history information VisitedCellInfoList in a local variable VarMobilityHistoryReport, where the history information is used to record maxCellHistory cell information where the UE recently resided.
Step 502, the first 20bit of cellGlobalId in the cell information is used as the global identity EnodeB Id of the source residing base station.
Since the UE is in RRC _ CONNECTED state before initiating the reestablishment, and the accessed cell information is stored at the top of the list in the UE-side variable VarMobilityHistoryReport. Therefore, when RRC reestablishment occurs, the UE may read information of the last visited Cell from a variable varmobilityhistorryreport, where cellglobal ID in the visited Cell information indicates the global identity (ECGI) of the Cell, where CellIdentity is composed of EnodeB ID + Cell ID, where the first 20 bits represent the global identity EnodeB ID of the base station, and the last 8BIt represents the number of the Cell in the base station. Since the neighboring base stations generally belong to the same PLMN (Public Land Mobile Network), only the high 20bit information in cellIdentity, i.e., the EnodeB Id (global identity of base station) may be added to the RRC reestablishment request message, and the following statement is specifically read from the variable VarMobilityHistoryReport to indicate the global identity (ECGI) of the cell using the cellglobalsid flag
EnodebId BIT STRING(SIZE(20))，optional
EXAMPLE III
As shown in fig. 6, the following method for RRC reestablishment according to the embodiment of the present application is implemented by combining a specific example, where the method includes:
step 601, after receiving the reestablishment request message, the reestablishment base station searches the UE index in the base station, and the UE carries the phyid of the source cell, the CRNT-I, shortMAC-I of the UE in the source cell and the global identity EnodebId of the source base station when initiating reestablishment.
In addition, after receiving the reestablishment request message, in order to prevent the delay instability of the request message transmitted on the X2 link, the reestablishment base station may start a set latency timer at the MAC layer, where the duration of the timer is contention resolution timer duration — reestablishment contention resolution message transmission duration (the default value may be 15 ms). The RRC layer inquires the context message of the UE in the base station, if the inquiry is successful, the context (containing the security parameters) of the UE is returned to the UE to send an RRC reestablishing message to the UE, and the process is ended.
Step 602, if the query fails, the reestablishing base station finds the neighboring base station matched with the Enodeb Id as the source residing base station for sending the context Request according to the matching of the Enodeb Id carried in the reestablishing Request message in the neighboring relation table and the target base station having the X2 link with the local station, requests the source residing base station for the UE context information through an X2 interface message (e.g., RLF Indication, etc.), and triggers the source cell to send the UE context to the reestablishing cell on the reestablishing base station through an X2 interface message Handover Request.
In addition, a waiting UE context timer is started after the RLF Indication message is sent, the timer is dynamically configured, the duration may be less than T301, and the specific duration value may be (T301-100 ms).
Step 603, after the waiting time timer set in the MAC layer is overtime, determining whether an RRC reestablishment message of the RRC layer is received, if not, sending a contention resolution message MSG4 not carrying the RRC reestablishment message to the UE, and then proceeding to step 604. If the RRC reestablishment message of the RRC layer is received, a contention resolution message MSG4 carrying the RRC reestablishment message is sent to the UE, and the process goes to step 606.
Step 604, the reestablishment base station determines that the sending of the RRC reestablishment message is successful, and performs a handover admission judgment;
the RRC layer of the reestablishing base station receives a handover request message of the source resident base station, carries out switching admission judgment and stops the UE context timer; and if the UE context timer is overtime and the handover request message is not received, clearing the timer and sending an RRC reestablishment rejection message to the UE.
Step 605, the reestablishment base station sends an RRC reestablishment message to the UE after completing the handover admission reply ACK;
when the RRC reestablishment message is sent, the MAC layer of the reestablishment base station judges whether the contention resolution message is sent or not after receiving the RRC reestablishment message, if the contention resolution message is sent, the RRC reestablishment message is cached, and the RRC reestablishment message is sent after MSG4ACK is received or MSG4 reaches the maximum retransmission times. If the competition resolving message is not sent, sending a competition resolving message MSG4 carrying an RRC reestablishment message; proceed to step 606.
Step 606, after receiving the reconfiguration complete message after successful re-establishment, sending a path switching request to the MME. And sending a context release message to the source residing base station after receiving the path switching success command.
Example four
As shown in fig. 7, an embodiment of the present application further provides a base station, where the base station may include:
a receiving unit 701, configured to receive a reestablishment request message sent by a UE after an RRC connection fails; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE;
the receiving unit 701 is specifically configured to: determining that the MSG3 containing the reestablishment request message is received at the MAC protocol layer, and setting the waiting time; if the RRC reestablishment message of the RRC layer is received before the waiting time is overtime, the MSG4 containing the competition resolving and RRC reestablishment messages is sent to the UE; if the waiting time is over and the RRC reestablishment message of the RRC layer is not received, sending a competition resolving message MSG4 to the UE, wherein the MSG4 does not contain the RRC reestablishment message; and sends an RRC reestablishment message after receiving an MSG4ACK or MSG4 reaches the maximum number of retransmissions.
In an implementable manner, the wait time is a difference between a contention resolution timer duration and a reestablishment contention resolution message transmission duration.
The manner in which the receiving unit 701 determines that the MSG3 containing the reestablishment request message is received at the MAC protocol layer may be:
and judging whether the SRB0 data in the MSG3 are all the first values, if not, judging whether the set bit in the SRB0 data is the second value, and if not, determining that the MSG3 containing the reestablishment request message is received at a MAC protocol layer.
A matching unit 702, configured to obtain a global identifier of a neighboring base station from locally configured neighboring cell information, and match the EnodeB Id with the global identifier of the neighboring base station; determining the source residing base station from the adjacent base stations;
an information obtaining unit 703 is configured to send an X2 interface message to the source-residing base station to request context information of the UE, and trigger the source-residing base station to send the context information to a cell reestablished on the base station through an X2 interface message to implement RRC reestablishment.
EXAMPLE five
As shown in fig. 8, an embodiment of the present application further provides a user terminal, where the user terminal may include:
a sending unit 801, configured to send a reestablishment request message to a reestablishment base station after the RRC connection fails; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE; enabling the reestablishment base station to acquire a global identity of an adjacent base station from locally configured adjacent cell information, and matching the EnodeB Id with the global identity of the adjacent base station; determining the source residing base station from the adjacent base stations; sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment;
a receiving unit 802, configured to receive an RRC reestablishment message sent by a reestablishment base station.
In an implementable manner, the user terminal may further comprise:
an identifier acquisition unit for acquiring cell information of a last visited cell from locally stored mobility history information before transmitting a reestablishment request message to a reestablishment base station; and taking the first 20 bits of the cellGlobalid in the cell information as the global identity EnodeB Id of the source residing base station.
EXAMPLE six
As shown in fig. 9, based on the same inventive concept, an embodiment of the present application further provides a computing apparatus, and with reference to fig. 9, the apparatus includes:
at least one processor 901, and
a memory 902, a communication interface 903 communicatively connected to the at least one processor 901;
the memory 902 stores instructions executable by the at least one processor 901, and the at least one processor 901 executes the instructions stored in the memory 902 to perform the method for RRC re-establishment in the first and/or second embodiments of the present application by using the communication interface 903.
Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer is caused to execute the method for RRC re-establishment in accordance with the first embodiment and/or the second embodiment of the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (9)

1. A method for RRC reestablishment of Radio Resource Control (RRC) is characterized in that after the RRC connection fails, the RRC reestablishment of a User Equipment (UE) comprises the following steps:
a reestablishment base station receives a reestablishment request message sent by the UE; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE;
the reestablishment base station acquires the global identification of the neighbor base station from the locally configured neighbor cell information, and matches the EnodeB Id with the global identification of the neighbor base station; determining the source residing base station from the adjacent base stations;
sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment;
wherein the receiving, by the reestablishment base station, the reestablishment request message sent by the UE includes:
determining that the MSG3 containing the reestablishment request message is received at the MAC protocol layer, and setting the waiting time;
if the RRC reestablishment message of the RRC layer is received before the waiting time is overtime, the MSG4 containing the competition resolving and RRC reestablishment messages is sent to the UE;
if the waiting time is overtime and the RRC reestablishment message of the RRC layer is not received, sending a competition resolving message MSG4 to the UE, wherein the MSG4 does not contain the RRC reestablishment message; and sends an RRC reestablishment message after receiving an MSG4ACK or MSG4 reaches the maximum number of retransmissions.
2. The method of claim 1, wherein the determining that the MSG3 containing the reestablishment request message was received at the MAC protocol layer comprises:
and judging whether the SRB0 data in the MSG3 are all the first values, if not, judging whether the set bit in the SRB0 data is the second value, and if not, determining that the MSG3 containing the reestablishment request message is received at a MAC protocol layer.
3. The method of claim 1 or 2, wherein the latency is a difference between a contention resolution timer duration and a re-establishment contention resolution message transmission duration.
4. A method for RRC reestablishment of Radio Resource Control (RRC) is characterized in that after the RRC connection fails, the RRC reestablishment of a User Equipment (UE) comprises the following steps:
the UE sends a reestablishment request message to a reestablishment base station; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE; enabling the reestablishment base station to determine that the MSG3 containing the reestablishment request message is received at the MAC protocol layer, and setting waiting time; if the RRC reestablishment message of the RRC layer is received before the waiting time is overtime, the MSG4 containing the competition resolving and RRC reestablishment messages is sent to the UE; if the waiting time is overtime and the RRC reestablishment message of the RRC layer is not received, sending a competition resolving message MSG4 to the UE, wherein the MSG4 does not contain the RRC reestablishment message; and sends RRC reestablishment message after receiving MSG4ACK or MSG4 reaching maximum retransmission times; the reestablishment base station acquires the global identification of the neighbor base station from the locally configured neighbor cell information, and matches the EnodeB Id with the global identification of the neighbor base station; determining the source residing base station from the adjacent base stations; and sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment.
5. The method of claim 4, wherein before the UE sends the reestablishment request message to the reestablishment base station, further comprising:
the UE acquires cell information of a last visited cell from locally stored mobility history information;
and taking the first 20 bits of the cellGlobalid in the cell information as the global identity EnodeB Id of the source residing base station.
6. A base station, comprising:
a receiving unit, configured to receive a reestablishment request message sent by a user equipment UE after an RRC connection fails; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE;
the matching unit is used for acquiring the global identifier of the adjacent base station from locally configured adjacent cell information and matching the EnodeB Id with the global identifier of the adjacent base station; determining the source residing base station from the adjacent base stations;
an information obtaining unit, configured to send an X2 interface message to the source-residing base station to request context information of the UE, and trigger the source-residing base station to send the context information to a cell reestablished on the base station through an X2 interface message to implement RRC reestablishment;
the receiving unit is specifically configured to determine that MSG3 including a reestablishment request message is received at the MAC protocol layer, and set a waiting time; if the RRC reestablishment message of the RRC layer is received before the waiting time is overtime, the MSG4 containing the competition resolving and RRC reestablishment messages is sent to the UE; if the waiting time is overtime and the RRC reestablishment message of the RRC layer is not received, sending a competition resolving message MSG4 to the UE, wherein the MSG4 does not contain the RRC reestablishment message; and sends an RRC reestablishment message after receiving MSG4ACK or MSG4 reaches the maximum number of retransmissions.
7. A user terminal, comprising:
a sending unit, configured to send a reestablishment request message to a reestablishment base station after the RRC connection fails; wherein, the request message includes a global identity EnodeB Id of a source residing base station corresponding to the UE; enabling the reestablishment base station to determine that the MSG3 containing the reestablishment request message is received at the MAC protocol layer, and setting waiting time; if the RRC reestablishment message of the RRC layer is received before the waiting time is overtime, the MSG4 containing the competition resolving and RRC reestablishment messages is sent to the UE; if the waiting time is overtime and the RRC reestablishment message of the RRC layer is not received, sending a competition resolving message MSG4 to the UE, wherein the MSG4 does not contain the RRC reestablishment message; and sends RRC reestablishment message after receiving MSG4ACK or MSG4 reaching maximum retransmission times; the reestablishment base station acquires the global identification of the neighbor base station from the locally configured neighbor cell information, and matches the EnodeB Id with the global identification of the neighbor base station; determining a source residing base station from the adjacent base stations; sending an X2 interface message to the source residing base station to request the context information of the UE, and triggering the source residing base station to send the context information to a reestablishing cell on the reestablishing base station through an X2 interface message to realize RRC reestablishment;
and the receiving unit is used for receiving the RRC reestablishment message sent by the reestablishment base station.
8. A computing device, comprising:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of any of claims 1-5 with the communications interface by executing the instructions stored by the memory.
9. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-5.
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