CN101998664A - Method, system and equipment for reestablishing radio resource control connection - Google Patents
Method, system and equipment for reestablishing radio resource control connection Download PDFInfo
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- CN101998664A CN101998664A CN2009100904518A CN200910090451A CN101998664A CN 101998664 A CN101998664 A CN 101998664A CN 2009100904518 A CN2009100904518 A CN 2009100904518A CN 200910090451 A CN200910090451 A CN 200910090451A CN 101998664 A CN101998664 A CN 101998664A
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Abstract
The embodiment of the invention discloses a method for reestablishing a radio resource control (RRC) connection. The method comprises the following steps of: after a first base station receives an RRC connection reestablishment request sent by a terminal, determining whether contextual information of the terminal is stored or not, wherein the contextual information is information required for distributing a radio resource used for performing RRC connection reestablishment for the terminal; after determining that the contextual information of the terminal is not stored, acquiring the contextual information of the terminal from network equipment which stores the contextual information; and distributing the radio resource for the terminal according to the acquired contextual information and indicating the terminal to reestablish the RRC connection with the first base station by using the radio resource. The embodiment of the invention also discloses a system and equipment for reestablishing the RRC connection. By method, the system and the equipment of the invention, the success rate of reestablishing a radio connection of user equipment (UE) can be effectively improved.
Description
Technical Field
The present invention relates to the field, and in particular, to a method, a system, and a device for connection reestablishment of radio resource control.
Background
Based on the existing standard techniques, after a terminal (UE) detects a Radio Link Failure (RLF), it attempts to initiate a Radio Resource Control (RRC) connection re-establishment procedure in order to maintain the connection.
The RRC connection reestablishment procedure is specifically as follows:
after the UE detects the RLF, the UE firstly performs cell selection and preferentially selects an evolved UMTS terrestrial radio access network (E-UTRAN) cell, wherein UMTS is a universal mobile telecommunications system. Cells of other radio systems (inter-RAT) may also be selected if there are no eligible E-UTRAN cells.
The method comprises the steps that an E-UTRAN cell is selected by UE, the UE sends RRC connection reestablishment request information to a base station of the E-UTRAN cell, and if the E-UTRAN cell is a prepared cell, namely the base station of the cell stores context information of the UE, the base station receives the RRC connection reestablishment request of the UE and sends the RRC connection reestablishment information to the UE; the UE performs connection reestablishment according to the received RRC connection reestablishment message and then sends an RRC connection reestablishment complete message to the base station, as shown in fig. 1A, at this time, the RRC connection reestablishment process of the UE is successful.
If the E-UTRAN cell is not a prepared cell, that is, the cell does not store the context information of the UE, the UE rejects the RRC connection reestablishment request and sends an RRC connection reestablishment rejection response to the UE, and the reestablishment process fails, as shown in fig. 1B, the UE directly enters an RRC IDLE (RRC _ IDLE) state, which means that the user drops the call.
In the existing standard protocol, when the UE attempts to initiate re-establishment connection to the base station of another cell after RLF occurs in one cell, the re-establishment cause information is carried in the "RRC connection re-establishment request" message. The base station receiving the RRC connection reestablishment request checks the reason of the reestablishment, and if the result is RLF, the base station generating the RLF sends an RLF Report (RLF Report) message to the base station generating the RLF, wherein the RLF Report message comprises a cell physical identity (PCI) of a current reestablished cell, the PCI of the cell generating the RLF and a cell radio network temporary identity (C-RNTI) of the UE in the cell generating the RLF, and the RLF Report message is used for helping the base station generating the RLF to detect the handover problem. As shown in fig. 1C, the UE has RLF in the cell of eNB1, then selects the cell of eNB2 to initiate connection re-establishment, and eNB2 sends an RLF report to eNB 1.
In the process of implementing the invention, the inventor finds that the following technical problems exist in the prior art:
after the base station receives the RRC connection reestablishment request message, if the base station does not store the context of the UE, the connection reestablishment must fail, thereby causing a call drop of the user. This is probably due to the fact that the handover parameters are not properly set, so that the RLF occurs without the UE having to send a measurement report, since no handover is triggered, there is no prepared cell on the network side, i.e. no connection can be re-established in any cell other than the current serving cell. Therefore, with the existing technology, it is difficult to solve the problem that the RLF and then the subsequent connection re-establishment are unsuccessful due to the inappropriate handover parameters.
Disclosure of Invention
The embodiment of the invention provides a method, a system and equipment for reestablishing radio resource control connection, which are used for improving the success rate of reestablishing radio connection of UE.
A method of radio resource control connection re-establishment, the method comprising:
after receiving a Radio Resource Control (RRC) connection reestablishment request sent by a terminal, a first base station determines whether context information of the terminal is stored or not, wherein the context information is information required for allocating radio resources to the terminal, and the radio resources are resources required for the terminal to execute RRC connection reestablishment;
after determining that the context information of the terminal is not stored, the first base station acquires the context information of the terminal from the network equipment in which the context information is stored;
and the first base station allocates the wireless resources for the terminal according to the acquired context information and instructs the terminal to reestablish RRC connection with the first base station by using the wireless resources.
A system for radio resource control connection re-establishment, the system comprising:
the terminal is used for sending a Radio Resource Control (RRC) connection reestablishment request to the first base station after Radio Link Failure (RLF) occurs;
a first base station, configured to determine whether context information of the terminal is stored after receiving the RRC connection reestablishment request, where the context information is information required for allocating a radio resource to the terminal, and the radio resource is a resource required for the terminal to perform RRC connection reestablishment; after determining that the context information of the terminal is not stored, acquiring the context information of the terminal from network equipment, allocating the radio resource to the terminal according to the acquired context information, and instructing the terminal to reestablish RRC connection with a first base station by using the radio resource;
and the network equipment is used for providing the saved context information of the terminal to the first base station.
A base station, the base station comprising:
a request receiving unit, configured to receive a radio resource control RRC connection reestablishment request sent by a terminal;
an information searching unit, configured to determine whether context information of the terminal is stored, where the context information is information required to allocate radio resources to the terminal, and the radio resources are resources required by the terminal to perform RRC connection reestablishment;
an information obtaining unit, configured to obtain context information of the terminal from a network device in which the context information is stored, after the information searching unit determines that the context information of the terminal is not stored;
and the reestablishment indicating unit is used for allocating the radio resources to the terminal according to the context information acquired by the information acquiring unit and indicating the terminal to reestablish RRC connection with the base station by using the radio resources.
In the invention, after receiving an RRC connection reestablishment request sent by a terminal, a first base station acquires the context information of the terminal from network equipment which stores the context information, allocates wireless resources for the terminal according to the acquired context information, and instructs the terminal to reestablish RRC connection with the first base station by using the allocated wireless resources. Therefore, the first base station can allocate the radio resource for reestablishing the RRC connection with the first base station to the terminal according to the acquired context information by acquiring the context information of the terminal from other equipment, thereby avoiding the RRC connection reestablishment failure of the first base station caused by not storing the context information of the terminal, and effectively improving the success rate of the radio connection reestablishment of the UE.
Drawings
Fig. 1A to fig. 1C are schematic diagrams illustrating related flow of an RRC connection reestablishment process in the prior art;
FIG. 2 is a schematic flow chart of a method provided by an embodiment of the present invention;
FIG. 3A is a schematic flow chart of a first embodiment of the present invention;
FIG. 3B is a schematic flow chart according to a second embodiment of the present invention;
FIG. 3C is a schematic flow chart of a third embodiment of the present invention;
FIG. 3D is a flowchart illustrating a fourth embodiment of the present invention;
FIG. 4 is a schematic diagram of a system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
In order to improve the success rate of reestablishing radio connection of UE, an embodiment of the present invention provides a method for reestablishing radio resource control connection, where after receiving an RRC connection reestablishment request sent by a terminal, a base station, if context information of the terminal is not stored, obtains the context information of the terminal from a network device that stores the context information, and further allocates radio resources for reestablishing RRC connection to the terminal by using the obtained context information.
Referring to fig. 2, the method for connection reestablishment of radio resource control according to the embodiment of the present invention specifically includes the following steps:
step 10: a first base station receives a Radio Resource Control (RRC) connection reestablishment request sent by a terminal;
step 11: determining whether context information of a terminal is stored, wherein the context information is information required for allocating radio resources to the terminal, and the radio resources are resources required for the terminal to perform RRC connection reestablishment;
step 12: after determining that the context information of the terminal is not stored, the first base station acquires the context information of the terminal from the network equipment in which the context information is stored;
step 13: and the first base station allocates wireless resources for the terminal according to the acquired context information and instructs the terminal to reestablish RRC connection with the first base station by using the allocated wireless resources.
In step 12, the first base station may specifically adopt the following two ways to obtain the context information of the terminal:
the first method comprises the following steps: before the first base station receives the RRC connection reestablishment request sent by the terminal, the terminal generates RLF in a cell covered by the second base station, the terminal sends the RRC connection reestablishment request to the first base station, and then the first base station acquires the context information of the terminal from the second base station.
When the method is adopted, the first base station can carry the information requesting the feedback of the terminal context in the existing RLF report, and the second base station carries the context information of the terminal in the RLF response message and sends the context information to the first base station after receiving the RLF report. Of course, other existing signaling messages or newly defined signaling messages may also be used to carry the information requesting the feedback of the context of the terminal.
Here, a specific method for the first base station to send the RLF report to the second base station may be as follows:
the first base station sending the RLF report to the second base station over a communication interface (e.g., an X2 interface) with the second base station; alternatively, the first base station sends the RLF report to the core network via a communication interface with the core network (e.g., an S1 interface), and the core network forwards the received RLF report to the second base station.
It should be noted that the procedure for transferring the RLF report between the base stations may be a type 1(Class1) interface message procedure, that is, whenever the second base station receives the RLF report, an RLF response message is returned to the first base station, and when the RLF report carries the information requesting to feed back the context of the terminal, the stored context information of the terminal is carried in the RLF response message and sent to the first base station.
And the second method comprises the following steps: before the first base station receives the RRC connection reestablishment request sent by the terminal, the terminal performs switching failure from the second base station to the target cell base station or performs switching from the source cell base station to the second base station, then RLF occurs in a cell covered by the second base station, and then the RRC connection reestablishment request is sent to the first base station; then, the first base station obtains context information of the terminal from the candidate target cell base station determined when the handover is performed.
When the method is adopted, firstly, the first base station sends a request message for acquiring the information of the candidate target cell base station determined during the switching to the second base station; after receiving the request message, the second base station sends the information of the candidate target cell base station determined during the switching to the first base station; after receiving the information, the first base station sends a request message for acquiring the context information of the terminal to the candidate target cell base station; and after receiving the request message, the candidate target cell base station sends the stored context information of the terminal to the first base station.
In the invention, when the UE detects the RLF, the base station (namely, the second base station) providing service for the UE also discovers that the radio link of the UE is lost according to the implementation mode, but the base station does not immediately release the context information of the UE, and the base station releases the stored context information of the terminal after receiving the RLF report sent by the first base station and sending the context information of the terminal to the first base station. Or after the RLF occurs, the terminal sets a timer for the base station (i.e., the second base station) serving the UE, and releases the stored context information of the terminal only after the timer expires, where the timeout duration of the timer needs to be longer than the timeout duration of the timer for RRC connection reestablishment configured for the terminal by the second base station.
In the invention, after RLF occurs to UE, a cell for subsequent reconstruction of RRC connection is selected, the cell may be a cell where the RLF occurs to the UE and may also be other cells, when the UE judges that the selected reconstruction cell is the cell, the reason for the occurrence of RLF can be preliminarily judged to be a Coverage reason, under the condition, the UE reconstructs the RRC connection with a base station (equivalent to a second base station) of the cell, because the base station of the cell already stores the context information of the UE, the RRC connection is reconstructed according to the process specified in the existing 3GPP standard, if the reconstruction fails, the reason for the occurrence of RLF can be further judged to be the Coverage reason, at the moment, the UE notifies the event of the RLF to a Capacity and Coverage Optimization (CCO) function module of a system, and the CCO function module takes corresponding optimization measures according to the RLF event; when the UE judges that the selected reestablishing cell is other cell, the UE sends an RRC connection reestablishment request to a base station (equivalent to a first base station) of the reestablishing cell, if the base station receiving the RRC connection reestablishment request determines that the base station does not store the context information of the UE, indication information is added in an RLF report sent to a second base station, the indication information represents the context information of the UE, and after the second base station receiving the RLF report sees the indication information, the second base station sends the locally stored context information of the UE to the first base station through an RLF response message. After obtaining the context information of the UE, the first base station allocates the radio resource required for reestablishing the RRC connection for the UE, and then the UE uses the radio resource to successfully reestablish the RRC connection with the first base station, even if the reestablished cell selected by the UE does not have the context of the UE initially.
The process according to the invention is illustrated below by means of specific examples:
hereinafter, for convenience of description, a base station that receives the RRC connection reestablishment request is referred to as a reestablishment base station, and a base station where the UE has RLF is referred to as a failed base station.
The first embodiment is as follows:
in this embodiment, the UE generates RLF without triggering a measurement report, as shown in fig. 3A:
step 201: the UE detects that RLF occurs without triggering a measurement report.
Step 202: when attempting to reestablish the RRC connection, the UE selects a reestablishing cell for subsequently reestablishing the RRC connection, and judges that the reestablishing cell is not a cell where the UE is located when the RLF occurs, namely a cell covered by the failed eNB.
Step 203: and the UE sends an RRC connection reestablishment request message to the eNB of the selected reestablishment cell, namely the reestablishment eNB. When the UE detects the RLF, the failure eNB may also detect that the radio link of the UE is lost, and the failure eNB does not immediately release the context information of the UE until the RLF report is received or the set timer expires.
Step 204: and after receiving the RRC connection reestablishment request, the reestablishment eNB detects that the context information of the UE is not stored locally.
Since the UE does not send a measurement report, i.e. does not trigger a handover, the re-establishment eNB does not have context information of the UE saved.
Step 205: and the reestablishing eNB sends an RLF report message to the failed eNB, wherein the RLF report message contains the indication information of the UE context.
Step 206: and after the failure eNB receives the RLF report message, if the message contains the indication information of the UE context, checking whether the context information of the UE is stored locally according to the C-RNTI of the UE in the message, and if so, carrying the context information of the UE in the RLF response message returned to the reestablishment eNB.
Step 207: after the reestablishing eNB receives the RLF response message, allocating wireless resources to the UE according to the context information of the UE carried in the message;
step 208: the reestablishment eNB sends RRC connection reestablishment information to the UE, wherein the information carries radio resource information distributed for the UE;
step 209: and after the UE reconstructs the required radio bearer according to the received RRC connection reconstruction message, the UE sends an RRC connection reconstruction completion message to the reconstruction eNB, and accordingly the UE reconstructs the RRC connection successfully.
Example two:
in this embodiment, the RLF (occurring in the source cell) caused by the UE handover failure is used to reestablish the eNB to acquire the context information of the UE from the source eNB, as shown in fig. 3B:
step 211: the UE performs handover from a source eNB to a target eNB, and the access to the target eNB fails, resulting in RLF;
step 212: when the UE tries to reestablish the RRC connection, a reestablishing cell for subsequently reestablishing the RRC connection is selected, and the reestablishing cell is judged to be not the cell where the UE is located when the RLF occurs, namely the cell covered by the source eNB and not the cell of the target eNB.
Step 213: and the UE sends an RRC connection reestablishment request message to the eNB of the selected reestablishment cell, namely the reestablishment eNB. When the UE detects the RLF, the source eNB may also detect that the radio link of the UE is lost, and the source eNB does not immediately release the context information of the UE until the RLF report is received or the set timer expires.
Step 214: and after receiving the RRC connection reestablishment request, the reestablishment eNB detects that the context information of the UE is not stored locally.
When the re-establishment eNB is not included in the measurement report transmitted when the UE performs handover, the re-establishment eNB does not prepare for the handover, which means that the re-establishment eNB does not save the context information of the UE.
Step 215: and the reestablishing eNB sends an RLF report message to the source eNB, wherein the RLF report message contains the indication information of the UE context.
Step 216: after receiving the RLF report message, the source eNB finds that the message contains the indication information needing the UE context, checks whether the context information of the UE is stored locally or not according to the C-RNTI of the UE in the message, and if so, carries the context information of the UE in the RLF response message returned to the reestablishing eNB.
Step 217: after the reestablishing eNB receives the RLF response message, allocating wireless resources to the UE according to the context information of the UE carried in the message;
step 218: the reestablishment eNB sends RRC connection reestablishment information to the UE, wherein the information carries radio resource information distributed for the UE;
step 219: and after the UE reconstructs the required radio bearer according to the received RRC connection reconstruction message, the UE sends an RRC connection reconstruction completion message to the reconstruction eNB, and accordingly the UE reconstructs the RRC connection successfully.
Example three:
in this embodiment, the UE is successfully handed over from the source eNB to the target eNB, but RLF occurs shortly after accessing the target eNB, as shown in fig. 3C:
step 221: the UE is switched from the source eNB to the target eNB, successfully accesses the target eNB and quickly detects the occurrence of RLF;
step 222: when attempting to reestablish the RRC connection, the UE selects a reestablishing cell for subsequently reestablishing the RRC connection, and judges that the reestablishing cell is not a cell where the UE is located when the RLF occurs, namely a cell covered by the target eNB and is not a cell of the source eNB.
Step 223: and the UE sends an RRC connection reestablishment request message to the eNB of the selected reestablishment cell, namely the reestablishment eNB. When the UE detects the RLF, the target eNB may also detect that the radio link of the UE is lost, and the target eNB does not immediately release the context information of the UE until the RLF report is received or the set timer expires.
Step 224: and after receiving the RRC connection reestablishment request, the reestablishment eNB detects that the context information of the UE is not stored locally.
When the re-establishment eNB is not included in the measurement report transmitted when the UE performs handover, the re-establishment eNB does not prepare for the handover, which means that the re-establishment eNB does not save the context information of the UE. The re-establishment eNB is included in the measurement report sent by the UE when performing handover, and is prepared for handover, except that the re-establishment eNB is not selected by the network as the target base station, but as the handover is performed, the resources and context information prepared by the re-establishment eNB for the UE are released. For both cases, the re-establishment eNB does not save the UE context information locally at this time.
Step 225: and the reestablishing eNB sends an RLF report message to the target eNB, wherein the RLF report message contains the indication information needing the UE context.
Step 226: after receiving the RLF report message, the target eNB finds that the message contains the indication information needing the UE context, checks whether the context information of the UE is stored locally or not according to the C-RNTI of the UE in the message, and if so, carries the context information of the UE in the RLF response message returned to the reestablishing eNB.
Step 227: after the reestablishing eNB receives the RLF response message, allocating wireless resources to the UE according to the context information of the UE carried in the message;
step 228: the reestablishment eNB sends RRC connection reestablishment information to the UE, wherein the information carries radio resource information distributed for the UE;
step 229: and after the UE reconstructs the required radio bearer according to the received RRC connection reconstruction message, the UE sends an RRC connection reconstruction completion message to the reconstruction eNB, and accordingly the UE reconstructs the RRC connection successfully.
Example four:
in this embodiment, the RLF (occurring in the source cell) caused by the UE handover failure is used to reestablish the eNB to acquire the context information of the UE from the candidate target eNB, as shown in fig. 3D:
step 231: the UE performs handover from a source eNB to a target eNB, and the access to the target eNB fails, resulting in RLF;
step 232: when the UE tries to reestablish the RRC connection, a reestablishing cell for subsequently reestablishing the RRC connection is selected, and the reestablishing cell is judged to be not the cell where the UE is located when the RLF occurs, namely the cell covered by the source eNB and not the cell of the target eNB.
Step 233: and the UE sends an RRC connection reestablishment request message to the eNB of the selected reestablishment cell, namely the reestablishment eNB.
Step 234: and after receiving the RRC connection reestablishment request, the reestablishment eNB detects that the context information of the UE is not stored locally.
Step 235: the reestablishing eNB sends a request message for acquiring the candidate target eNB information determined in the switching process to the source eNB;
step 236: after receiving the request message, the source eNB sends the information of the candidate target eNB determined during the switching and the C-RNTI of the UE in the candidate target eNB to the reestablishing eNB;
step 237: the reestablishing eNB sends a request message carrying the C-RNTI for acquiring the UE context information to the candidate target eNB according to the received information;
step 238: and the candidate target eNB checks whether the context information of the UE is stored locally or not according to the C-RNTI of the UE in the message, and if so, returns the context information of the UE to the reestablishing eNB.
Step 239: the reestablishing eNB allocates wireless resources to the UE according to the received context information of the UE;
step 240: the reestablishment eNB sends RRC connection reestablishment information to the UE, wherein the information carries radio resource information distributed for the UE;
step 241: and after the UE reconstructs the required radio bearer according to the received RRC connection reconstruction message, the UE sends an RRC connection reconstruction completion message to the reconstruction eNB, and accordingly the UE reconstructs the RRC connection successfully.
Referring to fig. 4, an embodiment of the present invention further provides a system for rrc connection reestablishment, where the system includes:
a terminal 30, configured to send a radio resource control, RRC, connection reestablishment request to a first base station after a radio link failure, RLF, occurs;
a first base station 31, configured to determine whether context information of the terminal is stored after receiving the RRC connection reestablishment request, where the context information is information required to allocate radio resources to the terminal, and the radio resources are resources required for the terminal to perform RRC connection reestablishment; after determining that the context information of the terminal is not stored, acquiring the context information of the terminal from network equipment, allocating the radio resource to the terminal according to the acquired context information, and instructing the terminal to reestablish RRC connection with a first base station by using the radio resource;
a network device 32, configured to provide the saved context information of the terminal to the first base station.
The network device 32 is a second base station where the terminal generates RLF. Accordingly, the first base station 31 is configured to:
transmitting an RLF report to the second base station;
the second base station is configured to:
and after receiving the RLF report, returning an RLF response message to the first base station, and carrying the stored context information of the terminal in the RLF response message when the RLF report carries the information requesting the feedback of the context of the terminal.
The network device 32 is a candidate target cell base station determined when the terminal performs handover from the second base station to the target cell base station or handover from the source cell base station to the second base station before RLF occurs in the cell covered by the second base station. Accordingly, the first base station 31 is configured to:
sending a request message for acquiring the information of the candidate target cell base station to a second base station; after receiving information of a candidate target cell base station returned by a second base station and C-RNTI (radio network temporary identity) of a terminal in the candidate target cell base station, sending a request message carrying the C-RNTI and acquiring context information of the terminal to the candidate target cell base station;
the second base station is configured to:
after receiving a request message for acquiring the information of the candidate target cell base station sent by a first base station, sending the information of the candidate target cell base station determined during the cell switching and the C-RNTI of the terminal in the candidate target cell base station to the first base station;
the candidate target cell base station is configured to:
and after receiving a request message for acquiring the terminal context information sent by the first base station, sending the stored context information of the terminal to the first base station according to the C-RNTI carried in the message.
The first base station 31 is configured to:
sending the RLF report to a second base station through a communication interface between the second base station and the RLF report; or,
and sending the RLF report to a second base station through a core network.
Referring to fig. 5, an embodiment of the present invention further provides a base station, where the base station includes:
a request receiving unit 40, configured to receive a radio resource control RRC connection reestablishment request sent by a terminal;
an information searching unit 41, configured to determine whether context information of the terminal is stored, where the context information is information required to allocate radio resources to the terminal, and the radio resources are resources required by the terminal to perform RRC connection reestablishment;
an information obtaining unit 42, configured to obtain context information of the terminal from the network device in which the context information is stored after the information searching unit determines that the context information of the terminal is not stored;
and a reestablishment instructing unit 43, configured to allocate the radio resource to the terminal according to the context information acquired by the information acquiring unit, and instruct the terminal to reestablish an RRC connection with the base station by using the radio resource.
The information obtaining unit 42 includes a first obtaining unit and/or a second obtaining unit, wherein:
the first obtaining unit is configured to obtain context information of the terminal from a second base station where the terminal generates the RLF.
The second obtaining unit is configured to obtain context information of the terminal from a candidate target cell base station, where the candidate target cell base station is a candidate target cell base station determined when the terminal performs handover from the second base station to the target cell base station or performs handover from the source cell base station to the second base station before RLF occurs in a cell covered by the second base station.
The first obtaining unit is used for:
sending an RLF report to a second base station, wherein the RLF report carries information requesting feedback of the terminal context; and receiving an RLF response message which is returned by the second base station and carries the context information of the terminal.
The second obtaining unit is configured to:
sending a request message for acquiring the information of the candidate target cell base station to a second base station; after receiving information of a candidate target cell base station returned by a second base station, sending a request message for acquiring the terminal context information to the candidate target cell base station; and receiving the context information of the terminal returned by the candidate target cell base station.
The first obtaining unit is used for:
sending the RLF report to a second base station through a communication interface between the second base station and the RLF report; or,
and sending the RLF report to a second base station through a core network.
In conclusion, the beneficial effects of the invention include:
in the solution provided in the embodiment of the present invention, after receiving an RRC connection reestablishment request sent by a terminal, a first base station acquires context information of the terminal from a network device that stores the context information, allocates a radio resource to the terminal according to the acquired context information, and instructs the terminal to reestablish an RRC connection with the first base station using the allocated radio resource. Therefore, the first base station can allocate the radio resource for reestablishing the RRC connection with the first base station to the terminal according to the acquired context information by acquiring the context information of the terminal from other equipment, thereby avoiding the RRC connection reestablishment failure of the first base station caused by not storing the context information of the terminal, effectively improving the success rate of the radio connection reestablishment of the UE, and reducing the call drop rate of the user.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (16)
1. A method for rrc connection re-establishment, the method comprising:
after receiving a Radio Resource Control (RRC) connection reestablishment request sent by a terminal, a first base station determines whether context information of the terminal is stored or not, wherein the context information is information required for allocating radio resources to the terminal, and the radio resources are resources required for the terminal to execute RRC connection reestablishment;
after determining that the context information of the terminal is not stored, the first base station acquires the context information of the terminal from the network equipment in which the context information is stored;
and the first base station allocates the wireless resources for the terminal according to the acquired context information and instructs the terminal to reestablish RRC connection with the first base station by using the wireless resources.
2. The method of claim 1, wherein the obtaining the context information of the terminal from the network device storing the context information comprises:
the first base station obtains the context information of the terminal from the second base station, and the second base station sends the context information to the terminal
And sending the RRC connection reestablishment request and the base station corresponding to the cell with the Radio Link Failure (RLF).
3. The method of claim 2, wherein the first base station obtaining the context information from a second base station comprises:
the first base station sends an RLF report to the second base station;
and after receiving the RLF report, the second base station returns an RLF response message to the first base station, and carries the stored context information of the terminal in the RLF response message when the RLF report carries the information requesting the feedback of the context of the terminal.
4. The method of claim 1, wherein the obtaining the context information of the terminal from the network device storing the context information comprises:
the first base station acquires the context information of the terminal from a candidate target cell base station; the candidate target cell base station is determined when cell switching is executed before the terminal sends the RRC connection reestablishment request and before RLF occurs in a cell covered by a second base station; the cell handover is a handover of the terminal from a second base station to a target cell base station or a handover from a source cell base station to a second base station.
5. The method of claim 4, wherein the first base station obtaining context information for the terminal from candidate target cell base stations comprises:
the first base station sends a request message for acquiring the information of the candidate target cell base station to a second base station; after receiving the request message, the second base station sends the information of the candidate target cell base station determined when the cell switching is executed to the first base station;
after receiving the information, the first base station sends a request message for acquiring the context information of the terminal to the candidate target cell base station; and after receiving the request message, the candidate target cell base station sends the stored context information of the terminal to the first base station.
6. The method of claim 3, wherein the first base station sending an RLF report to a second base station comprises:
the first base station sends the RLF report to a second base station through a communication interface between the first base station and the second base station; or,
and the first base station sends the RLF report to a core network, and the core network forwards the RLF report to a second base station.
7. A system for rrc connection re-establishment, the system comprising:
the terminal is used for sending a Radio Resource Control (RRC) connection reestablishment request to the first base station after Radio Link Failure (RLF) occurs;
a first base station, configured to determine whether context information of the terminal is stored after receiving the RRC connection reestablishment request, where the context information is information required for allocating a radio resource to the terminal, and the radio resource is a resource required for the terminal to perform RRC connection reestablishment; after determining that the context information of the terminal is not stored, acquiring the context information of the terminal from network equipment, allocating the radio resource to the terminal according to the acquired context information, and instructing the terminal to reestablish RRC connection with a first base station by using the radio resource;
and the network equipment is used for providing the saved context information of the terminal to the first base station.
8. The system of claim 7, wherein the network device is a second base station where the terminal is located when the terminal is RLF.
9. The system of claim 8, wherein the first base station is configured to:
transmitting an RLF report to the second base station;
the second base station is configured to:
and after receiving the RLF report, returning an RLF response message to the first base station, and carrying the stored context information of the terminal in the RLF response message when the RLF report carries the information requesting the feedback of the context of the terminal.
10. The system of claim 7, wherein the network device is a candidate target cell base station determined when the terminal performs handover from the second base station to the target cell base station or handover from the source cell base station to the second base station before RLF occurs in a cell covered by the second base station.
11. The system of claim 10, wherein the first base station is configured to:
sending a request message for acquiring the information of the candidate target cell base station to a second base station; after receiving information of a candidate target cell base station returned by a second base station, sending a request message for acquiring the terminal context information to the candidate target cell base station;
the second base station is configured to:
after receiving a request message for acquiring the information of the candidate target cell base station sent by a first base station, sending the information of the candidate target cell base station determined when the cell is switched to the first base station;
the candidate target cell base station is configured to:
and after receiving a request message for acquiring the context information of the terminal sent by the first base station, sending the stored context information of the terminal to the first base station.
12. A base station, comprising:
a request receiving unit, configured to receive a radio resource control RRC connection reestablishment request sent by a terminal;
an information searching unit, configured to determine whether context information of the terminal is stored, where the context information is information required to allocate radio resources to the terminal, and the radio resources are resources required by the terminal to perform RRC connection reestablishment;
an information obtaining unit, configured to obtain context information of the terminal from a network device in which the context information is stored, after the information searching unit determines that the context information of the terminal is not stored;
and the reestablishment indicating unit is used for allocating the radio resources to the terminal according to the context information acquired by the information acquiring unit and indicating the terminal to reestablish RRC connection with the base station by using the radio resources.
13. The base station of claim 12, wherein the information acquisition unit comprises a first acquisition unit and/or a second acquisition unit, wherein:
the first obtaining unit is configured to obtain context information of the terminal from a second base station where the terminal generates the RLF;
the second obtaining unit is configured to obtain context information of the terminal from a candidate target cell base station, where the candidate target cell base station is a candidate target cell base station determined when the terminal performs handover from the second base station to the target cell base station or performs handover from the source cell base station to the second base station before RLF occurs in a cell covered by the second base station.
14. The base station of claim 13, wherein the first acquisition unit is configured to:
sending an RLF report to a second base station, wherein the RLF report carries information requesting feedback of the terminal context; and receiving an RLF response message which is returned by the second base station and carries the context information of the terminal.
15. The base station of claim 13, wherein the second acquisition unit is configured to:
sending a request message for acquiring the information of the candidate target cell base station to a second base station; after receiving information of a candidate target cell base station returned by a second base station, sending a request message for acquiring the terminal context information to the candidate target cell base station; and receiving the context information of the terminal returned by the candidate target cell base station.
16. The base station of claim 14, wherein the first acquisition unit is configured to:
sending the RLF report to a second base station through a communication interface between the second base station and the RLF report; or,
and sending the RLF report to a second base station through a core network.
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