CN112911730B

CN112911730B - Radio Resource Control (RRC) recovery method and device

Info

Publication number: CN112911730B
Application number: CN201911136857.5A
Authority: CN
Inventors: 陈建忠
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2022-11-25
Anticipated expiration: 2039-11-19
Also published as: CN112911730A

Abstract

The embodiment of the invention provides a Radio Resource Control (RRC) recovery method and device. The method comprises the following steps: receiving an RRC recovery request sent by a terminal UE, and acquiring an inactive radio network temporary identifier I-RNTI carried in the RRC recovery request; the I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE; determining the RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type; and performing RRC recovery on the UE according to the RRC recovery type. The embodiment of the invention solves the problem that the I-RNTI only has the identity identification number of the UE in the prior art.

Description

Radio Resource Control (RRC) recovery method and device

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a method and an apparatus for RRC recovery.

Background

With the development of wireless communication technology, the third Generation Partnership project (3 rd Generation Partnership project,3 gpp) introduced New Radio (NR) technology. In the NR system, radio Resource Control (RRC) is mainly used to allocate Radio resources and send signaling; for example, the control signaling between a terminal (User Equipment, UE) and an Access network is mainly an RRC message, which carries all parameters required for establishing, modifying, and releasing protocol entities of an Access Stratum and a physical layer, and also carries some signaling of a Non-Access Stratum (NAS).

RRC currently supports 3 states: idle (Idle), inactive (Inactive), connected (Connected). In the inactive state, the UE can move within a radio access network based Notification Area (RNA) configured by the base station without notifying the base station. In the inactive state, the last serving base station of the UE maintains the context connection of the UE; the base station configures an Inactive-Radio Network Temporary Identifier (I-RNTI) for the UE so as to identify the identity of the UE; when the UE enters the connected state again from the inactive state, the connected target base station needs the relevant parameters when the UE enters the inactive state so as to acquire the context session information of the UE and finally convert the UE into the connected state; in the prior art, the I-RNTI only has the identity number of the UE, and other related parameters are difficult to acquire by a connected target base station.

Disclosure of Invention

The embodiment of the invention provides a Radio Resource Control (RRC) recovery method and device, aiming at solving the problem that in the prior art, an I-RNTI only has an identity identification number of UE.

In one aspect, an embodiment of the present invention provides a radio resource control RRC recovery method applied to a network side device, where the method includes:

receiving an RRC (radio resource control) recovery request sent by a terminal UE (user equipment), and acquiring an inactive radio network temporary identifier I-RNTI (radio network temporary identifier) carried in the RRC recovery request; the I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE;

determining the RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type;

and performing RRC recovery on the UE according to the RRC recovery type.

Optionally, the step of determining the RRC recovery type of the UE according to the I-RNTI includes:

determining the identification number of the target base station and the identification number of the target service cell requested by the UE according to the RRC recovery request;

if the original base station identification number is different from the identification number of the target base station, the RRC recovery type of the UE is an inter-base station type;

if the original base station identification number is the same as the identification number of the base station and the original serving cell identification number is different from the identification number of the target serving cell, the RRC recovery type of the UE is a same-station different-cell type;

and/or

And if the original base station identification number is the same as the identification number of the base station and the original serving cell identification number is the same as the identification number of the target serving cell, the RRC recovery type of the UE is the same-station same-cell type.

Optionally, the step of performing RRC recovery on the UE according to the RRC recovery type includes:

if the RRC recovery type is an inter-base station type or a same-station different-cell type, the I-RNTI also comprises a UE identification number of the UE in an original service cell, and a context session request carrying the UE identification number is sent to the original service cell;

and if the RRC recovery type is the same-station same-cell type, sending an RRC recovery message to the UE.

Optionally, before the step of receiving the RRC recovery request sent by the terminal UE, the method includes:

if the UE supports the inactive state, acquiring Core Network Assistance Information (CNAI) carried in a preset session message of the UE, and if a Tracking Area Identifier (TAI) list of a current serving cell of the UE has the TAI carried in the CNAI, allowing the UE to enter the inactive state;

or

And if the UE supports the inactive state and acquires the temporary mobile user identifier (STMSI) of the UE, allowing the UE to enter the inactive state.

Optionally, the method further comprises:

acquiring a base station identification number of a base station to which the current service cell of the UE belongs and a cell identification number of the current service cell;

and configuring the I-RNTI for the UE according to the base station identification number and the cell identification number.

Optionally, after the step of configuring the I-RNTI for the UE, the method further includes:

and carrying the I-RNTI and preset suspension control information in an RRC release message, sending the RRC release message to the UE, and starting a context maintenance timer for the UE.

On the other hand, an embodiment of the present invention further provides a radio resource control RRC recovery apparatus, which is applied to a network side device, and the apparatus includes:

the request receiving module is used for receiving an RRC recovery request sent by a terminal UE and acquiring an inactive radio network temporary identifier I-RNTI carried in the RRC recovery request; the I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE;

the type determining module is used for determining the RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type;

and the execution module is used for executing RRC recovery on the UE according to the RRC recovery type.

Optionally, the type determining module includes:

an identification number determining submodule, configured to determine, according to the RRC recovery request, an identification number of a target base station and an identification number of a target serving cell, where the identification numbers are requested by the UE;

a first determining submodule, configured to determine that the RRC recovery type of the UE is an inter-base station type if the identification number of the original base station is different from the identification number of the target base station;

a second determining submodule, configured to determine that the RRC recovery type of the UE is a same-site different-cell type if the identification number of the original base station is the same as the identification number of the base station and the identification number of the original serving cell is different from the identification number of the target serving cell;

and/or

And a third determining submodule, configured to determine that the RRC recovery type of the UE is the same as the same station and cell type if the original base station identification number is the same as the identification number of the base station and the original serving cell identification number is the same as the identification number of the target serving cell.

Optionally, the execution module includes:

a first execution sub-module, configured to send a context session request carrying a UE identity number to an original serving cell if the RRC recovery type is an inter-base station type or a same-station different-cell type, and the I-RNTI further includes the UE identity number of the UE in the original serving cell;

and the second execution submodule is used for sending an RRC recovery message to the UE if the RRC recovery type is the same-station same-cell type.

Optionally, the apparatus comprises:

a first determining module, configured to, if the UE supports an inactive state, acquire core network assistance information CNAI carried in a preset session message of the UE, and a tracking area identity TAI list of a current serving cell of the UE has a TAI carried in the CNAI, allow the UE to enter the inactive state;

or

And a second judging module, configured to allow the UE to enter the inactive state if the UE supports the inactive state and acquires the temporary mobile subscriber identity stmi of the UE.

Optionally, the apparatus further comprises:

an identification number obtaining module, configured to obtain a base station identification number of a base station to which the current serving cell of the UE belongs, and a cell identification number of the current serving cell;

and the configuration module is used for configuring the I-RNTI for the UE according to the base station identification number and the cell identification number.

Optionally, the apparatus further comprises:

and the message sending module is used for carrying the I-RNTI and the preset suspension control information in an RRC release message, sending the RRC release message to the UE and starting a context maintenance timer for the UE.

In still another aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps in the RRC recovery method for radio resource control as described above.

In still another aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the steps in the radio resource control RRC recovery method described above.

In the embodiment of the invention, an RRC recovery request sent by a terminal UE is received, and a non-activated radio network temporary identifier I-RNTI carried in the RRC recovery request is obtained; determining the RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type; performing RRC recovery on the UE according to the RRC recovery type; the original base station identification number and the original service cell identification number of the UE are indicated on the I-RNTI, so that the base station can identify the RRC recovery type of the UE, obtain the context information of the UE conveniently, recover the context of the UE, and search corresponding resources according to the I-RNTI.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a flowchart illustrating a procedure of a radio resource control RRC recovery method according to an embodiment of the present invention;

FIG. 2 is a diagram of a first exemplary application scenario in accordance with an embodiment of the present invention;

figure 3 is a schematic diagram of an I-RNTI of a second example of an embodiment of the present invention;

FIG. 4 is a diagram of a third exemplary application scenario in accordance with an embodiment of the present invention;

FIG. 5 is a flowchart of the steps of a fourth example of an embodiment of the present invention;

FIG. 6 is a flowchart of the steps of a fifth example of an embodiment of the present invention;

fig. 7 is a block diagram of a radio resource control RRC recovery apparatus according to an embodiment of the present invention;

fig. 8 is a block diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Referring to fig. 1, an embodiment of the present invention provides a radio resource control RRC recovery method, which is applied to a network side device, where the network side device may be a base station or other device communicatively connected to a UE, and the base station is taken as an example in the embodiment of the present invention, where the method includes:

step 101, receiving an RRC recovery request sent by a terminal UE, and acquiring an inactive radio network temporary identifier I-RNTI carried in the RRC recovery request; wherein, the I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE.

As a first example, referring to fig. 2, when the UE changes from the connected state to the inactive state, the base station sends a radio resource control Release (RRC Release) message to the UE, and the RRC Release message carries a Suspend-configuration parameter (Suspend-configuration), and the UE enters the inactive state; when the UE is changed from the inactive state to the connected state, an RRC recovery Request (RRC Resume Request) is sent to the base station.

Generally, a UE sends an RRC recovery request to a base station under the following conditions:

when downlink signaling or downlink data arrives, an original service base station of the UE initiates RAN Paging (Paging);

if the UE has uplink data to be transmitted, the UE can actively initiate an RRC recovery process;

the RNA is periodically updated, or the UE moves to a new serving cell, and the RNA Area identity (Area Code) of the new serving cell is different from that of the original serving cell, the UE will actively initiate an RRC recovery procedure.

After a base station (namely a current base station) receives an RRC recovery request, acquiring an I-RNTI (inactive radio network temporary identifier) carried in the RRC recovery request, wherein the I-RNTI is configured for the UE by an original service base station of the UE, and the original service base station and the current base station can be the same base station or different base stations.

The I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE, wherein the original base station identification number is used for indicating an original service base station of the UE, and the original service cell identification number is used for indicating an original service cell of the UE; as a second example, referring to fig. 3, fig. 3 shows a schematic diagram of an I-RNTI, wherein the I-RNTI is composed of 40bits, and includes an original base station identification number (Gnb-ID in fig. 3) of 22bits, an original serving cell identification number (Flag) of 2bits, and a UE index identification (UEIndex) of 16 bits.

Step 102, determining the RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type.

In the step, the base station determines the RRC recovery type of the UE according to the I-RNTI; specifically, the RRC recovery type includes an inter-base station type, a co-station inter-cell type, and/or a co-station co-cell type; the type between the base stations, namely the original service base station connected when the UE enters the RRC non-activated state is not the same base station with the base station; the type of the different cells in the same station, namely the original service cell connected when the UE enters the RRC non-activated state, and the target cell requested to be connected in the RRC recovery request are different cells in the same base station; the same station and the same cell type, namely the original service cell and the target cell are the same cell.

Specifically, the base station firstly judges whether the identification number of the base station is the same as the identification number of the base station according to the original base station identification number carried in the I-RNTI, and if the identification number of the base station is different, the type of the base station is determined; if the cell identification numbers are the same, further judging whether the original service cell identification number is the same as the identification number of the target cell, if not, the cell type is the same station but different; if the same type, the same station and the same cell type are obtained.

And 103, performing RRC recovery on the UE according to the RRC recovery type.

In the step, the base station determines the RRC recovery type of the UE according to the I-RNTI, and then performs RRC recovery on the UE according to different RRC recovery types, so that the base station determines whether to initiate a message of an Xn or Ng interface, acquires the context message of the UE and recovers the context of the UE; when each network entity executes RRC recovery flow processing conveniently, corresponding resources are searched according to the I-RNTI; and the method is distinguished from a radio network temporary cell identifier (C-RNTI) when a radio resource control establishment Request (RRC Setup Request) occurs, and is convenient for recovering various resources and non-access stratum contexts when the RRC is abnormal.

In the embodiment of the invention, an RRC recovery request sent by a terminal UE is received, and a non-activated radio network temporary identifier I-RNTI carried in the RRC recovery request is obtained; determining the RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type; performing RRC recovery on the UE according to the RRC recovery type; indicating the original base station identification number and the original service cell identification number of the UE on the I-RNTI, so that the base station identifies the RRC recovery type of the UE, is convenient to acquire the context message of the UE, recovers the context of the UE, and searches corresponding resources according to the I-RNTI; the embodiment of the invention solves the problem that the I-RNTI only has the identity identification number of the UE in the prior art.

Optionally, in this embodiment of the present invention, step 102 includes:

and/or

And if the identification number of the original base station is the same as the identification number of the base station and the identification number of the original serving cell is the same as the identification number of the target serving cell, the RRC recovery type of the UE is the same-station same-cell type.

Specifically, the base station firstly determines a target base station and a target serving cell requested by the UE according to the RRC recovery request; specifically, when the UE sends an RRC recovery request to the base station, the RRC recovery request is sent through a contention-based random access signaling Msg3, a serving cell occupied by the UE when the UE sends the Msg3 is a target serving cell, and a base station to which the target serving cell belongs is a target base station; the base station determines the identification number of the target base station and the identification number of the target serving cell.

Then, judging an original base station identification number carried in the I-RNTI, judging whether the identification number is the same as the identification number of the base station, and if the identification number is different, determining the type between the base stations; if the cell identification numbers are the same, further judging whether the original service cell identification number is the same as the identification number of the target cell, if not, the cell type is the same station but different; if the same type, the same station and the same cell type are obtained.

Optionally, in this embodiment of the present invention, the step of performing RRC recovery on the UE according to the RRC recovery type includes:

In this step, if the RRC recovery type is an inter-base station type or a co-station inter-cell type, the I-RNTI further includes a UE identification number of the UE in an original serving cell, as shown in fig. 3, taking the UE identification number as a UE Index, where the UE Index is a UE Index of 16bits and is used to identify the UE identity, so as to facilitate searching for a context session of the UE according to the UE identification number; if the type is the inter-base station type, the base station determines an original base station according to the identification number of the original base station, determines an original service cell according to the identification number of the original service cell, and sends a context session request carrying the UE identification number to the original service cell;

and if the cell type is the same station and different cell type, the base station sends a context session request carrying the UE identification number to the original service cell according to the original service cell identification number.

And if the RRC recovery type is the same-station same-cell type, the base station directly sends an RRC recovery message to the UE.

As an implementation mode, the base station can send I-RNTI to the original service cell, and the I-RNTI carries the UE identification number.

As a third example, referring to fig. 4, fig. 4 shows an example of an inter-base station type RRC recovery procedure, where the original base station is the last serving base station before the UE enters the inactive state, and the last serving base station maintains the context of the UE and the NG connection (connection of the base station with the AMF/UPF) associated with the UE.

The AMF is an Access and Mobility Management Function (Access and Mobility Management Function), the UPF is a User Plane Function (User Plane Function), and the AMF/UPF provides core network assistance information for the base station.

The target NGAP and the target XNAP are respectively logical interfaces of the target base station, and the target RRC and the target Packet Data Convergence Protocol (PDCP) layer/Media Access Control (MAC) layer are both logical layers of the target base station side.

The method mainly comprises the following steps:

step 401, the terminal initiates a RRC radio resource control recovery Request1 (Resume Request 1) message carrying full-I-RNTI and a cause value of RNA Update.

The full-I-RNTI comprises an original base station identification number of 22bits, an original service cell identification number of 2bits and a UE index identification of 16 bits; full-I-RNTI is the meaning of long I-RNTI; RNA Update is the meaning of notification area Update based on the radio access network.

Step 402, the target MAC layer forwards the RRC Resume Request1 message to the RRC layer;

in step 403, the RRC layer judges whether the cell served last time is an inter-base station cell, other cells in the base station or the cell according to full-I-RNTI.

Step 404, if the cell is an inter-base station cell or other cell in the base station, sending a message for searching the UE context to the XNAP interface.

XNAP is XN application protocol;

step 405, the XNAP interface judges that the cell served last time is the cell between base stations/other cells in the base stations according to full-I-RNTI, and sends a Retrieve UE Context Request (carrying full-I-RNTI) message to the original base station; obtaining a UE Context Request by a Retrieve UE Context Request;

step 406, the XNAP receives a response message that the original base station carries the UE context;

step 407, the XNAP sends a response message of UE context to the RRC layer;

step 408, the RRC layer performs security parameter matching, resource allocation, radio parameter configuration, key calculation, RRC recovery code stream construction and the like, and sends an RRC configuration message to the PDCP;

step 409, the PDCP layer sends the encrypted RRC recovery message (carrying full-I-RNTI) to the UE;

step 410, the UE sends RRC recovery complete information to the MAC layer;

step 411, the mac layer sends a signaling message to the RRC layer to carry an RRC recovery complete message;

step 412, the RRC layer updates the resource table and the UE context, and sends an RRC inactive recovery completion message to the PDCP to indicate to recover the UE context;

step 413, the RRC layer sends an RRC recovery complete message to the XNAP;

in step 414, the XNAP sends an XN-U Address Indication message to the original base station;

wherein, the XN-U Address Indication is the Address Indication of the Xn user plane.

Step 415, the rrc layer sends a Path Switch Request (Path Switch Request) to the NGAP;

wherein, NGAP is meaning of NG application protocol;

step 416, the NGAP sends a message to the AMF/UPF;

step 417, the AMF/UPF sends a Path Switch Request received indication message to the NGAP;

step 418, the ngap sends a message to the RRC to indicate that the data path switch is complete;

step 419, the RRC layer sends UE release message to XNAP;

step 420, the XNAP sends UE session release message to the original base station to instruct the original base station to release UE;

in the above example, the original base station identity number and the original serving cell identity number of the UE are indicated in full-I-RNTI, so that the base station identifies the RRC recovery type of the UE, thereby facilitating obtaining the context message of the UE, recovering the context of the UE, and searching for corresponding resources according to the I-RNTI.

Optionally, in this embodiment of the present invention, before the step of receiving the RRC recovery request sent by the terminal UE, the method includes:

if the UE supports an inactive state, acquiring Core Network Assistance Information (CNAI) carried in a preset session message of the UE, wherein a Tracking Area Identifier (TAI) carried in the CNAI exists in a TAI list of a current service cell of the UE, and a Protocol Data Unit (PDU) session exists in the UE, allowing the UE to enter an inactive state;

or

And if the UE supports the inactive state, the temporary mobile user identifier (STMSI) of the UE is obtained, and the PDU session exists in the UE, allowing the UE to enter the inactive state.

The base station determines whether to send release (carrying suspension control) to enable the UE to enter an inactive state according to whether the UE capability supports the inactive state;

reporting whether the UE supports the non-activated state to a network side in the registration process of the core network side by the UE; if the UE supports the inactive state, before the base station receives the RRC recovery request, the base station needs to determine that the UE satisfies one of the following two conditions, and allow the UE to enter the inactive state:

the first condition is as follows: acquiring Core Network Assistance Information (CNAI) carried in a preset session message of the UE, wherein a Tracking Area Identity (TAI) carried in the CNAI exists in a TAI list of a current serving cell of the UE, and a Protocol Data Unit (PDU) session exists in the UE; the current cell has only one TAI configured in the system message (containing the public land mobile network PLMN, tracking area code TAC, RAN-based notification area code RANAC,3 fields). If the TAI list for RRC inactivity is obtained from the core network assistance information field, it needs to be checked whether the TAI configuration of the cell is in the TAI list of the core network assistance information, and if not, the cell is not allowed to enter an inactive state.

Or

And a second condition: acquiring a Serving-temporal Mobile Subscriber Identity (STMSI) of a UE, wherein the UE has a PDU session; wherein, obtaining STMSI, the base station can calculate terminal identification, and process RAN (radio access network) paging.

After the UE is allowed to enter the inactive state, the RRC layer configures a Suspend-control parameter (Suspend-Config) when the UE is released, informs the UE to enter the inactive state, and informs the PDCP layer that the UE enters the inactive state; otherwise, directly releasing the UE and releasing the base station resources and the bottom layer.

As a fourth example, referring to fig. 5, fig. 5 shows a main process of the UE transferring from the connected state to the inactive state, including:

step 501, an original service cell broadcasts information such as TAI, RANAC, RNTI marks and the like;

the RNTI mark is TRUE which indicates that the I-RNTI in the embodiment of the invention is adopted, namely full-I-RNTI, and the full-I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE.

In step 502, the ue enters a connected state.

And the core network sends the core network assistance information to the base station in the UE registration or NG connection (connection between the base station and the AMF/UPF) switching process, and the UE enters a connected state after the PDU session is established.

Step 503, the base station MAC layer and the RRC layer determine whether the UE enters an inactive state;

if the UE non-survival message carrying the non-activation reason is reported to the RRC layer by the MAC layer;

and the RRC layer judges whether the UE is allowed to enter the inactive state, if the condition is met, full-I-RNTI is distributed to the UE and carried to the UE in the released suspension control, and the UE enters the inactive state after receiving the control.

The MAC layer and the RRC layer comprise a user non-survival message interface, loss (LOST) and non-activation (Inactive) reported by the reason value of the non-activation reason, and the like. If the MAC layer reports a plurality of messages, the base station only processes the first message received.

If the MAC layer reports the LOST reason, the RRC directly releases the user, and releases the base station resources and the bottom layer;

step 504, the UE enters an inactive state;

when uplink data needs to be sent or downlink signaling or data needs to be sent or RNA periodic updating and the like, the UE carries full-I-RNTI to send RRC Resume Request1 information to the base station.

Step 505, the base station judges the RRC recovery type of the UE according to full-IRNTI;

if the cell is an inter-base station/intra-base station cell, a UE context acquisition request message needs to be sent to the original serving cell, and after receiving a UE context acquisition response message of the original serving cell, the base station sends an RRC recovery message to the UE.

And if the type is the same-station same-cell type, the base station directly sends an RRC recovery message to the UE.

In step 506, after the base station receives an RRC recovery Complete (RRC Resume Complete) message, the UE enters an RRC connected state.

Further, referring to fig. 6, in step 503, the base station MAC layer determines whether the UE enters an inactive state, which specifically includes the following steps:

601, the UE is in an RRC connection state;

step 602, the MAC layer in the base station determines whether the UE is not alive:

the detection is jointly performed by an MAC layer and a Radio Link Control Structure (RLC) layer:

when the reason is detected to be User Inactivity (User Inactivity), the MAC layer reports a User non-survival message carrying the Inactive reason value to the RRC layer, and triggers the UE to enter an Inactive state;

when the reason is detected to be UE _ LOST, reporting a user non-survival message carrying the reason value of UE _ LOST to an RRC layer, and triggering the UE to release RRC connection.

Step 603, the base station RRC layer receives the user non-survival message carrying UE _ LOST by the MAC layer, and enters corresponding processing step 604;

step 605, the base station RRC layer receives the user non-alive message carrying the INACTIVE state in the MAC layer, and determines whether to allow the user to enter the INACTIVE state;

if yes, go to step 604, otherwise go to step 606;

step 604, sending a release message to the UE to directly release the user, and release the base station user resources and the bottom layer.

Step 606, if the user is allowed to enter the inactive state, a release message carrying the suspend control is sent to the UE to notify the user to enter the inactive state, and the MAC/RLC/L1 user resource and the bottom layer are released.

In step 607, the UE is in the RRC inactive state.

Optionally, in this embodiment of the present invention, when the base station serves as an original serving base station, the base station configures an I-RNTI for the UE, and specifically, the method further includes:

And the base station configures the I-RNTI for the UE according to the base station identification number and the cell identification number, and carries the I-RNTI to the UE in a release message. The UE has full-I-RNTI and short-I-RNTI in an inactive state.

Here, full-I-RNTI is long I-RNTI; short-I-RNTI, namely short I-RNTI;

when RRC is recovered, if the RNTI mark broadcasted by the base station in the broadcast message SIB1 is TRUE, full-I-RNTI is used, and the terminal initiates an RRC recovery Request by using an RRC Resume Request1 message; SIB1, namely System Information Block1 System message Block 1;

otherwise, the RRC recovery Request message is used for carrying the short I-RNTI for initiation.

By indicating the use of full-I-RNTI in the broadcast message SIB1 of the base station, the UE is enabled to initiate an RRC recovery Request flow with RRC Resume Request1 in msg 3. The base station also informs the PDCP/RRC corresponding terminal to enter an inactive state, informs the MAC/RLC/L1 to release related resources, and carries information of suspension control in a release message.

Further, in this embodiment of the present invention, after the step of configuring the I-RNTI for the UE, the method further includes:

The method comprises the steps that when a user is released, an RRC configures a suspension control parameter, carries the I-RNTI and the preset suspension control parameter in an RRC release message, sends the RRC release message to the UE and informs the UE of entering an inactive state; and releasing the RLC/MAC/L1 and informing the PDCP user of entering an inactive state.

After sending the RRC release message carrying the suspension control information, starting a context maintenance timer for the UE in the non-activated state, wherein the context maintenance timer is restarted after the RRC release message carrying the suspension control information is sent each time. Optionally, the value of the timer may be set to update the timer every RNAU (RAN-based Notification Area) period, and meanwhile, a guard time (e.g., 60 seconds) is added, and the user release is triggered after the timer expires.

Having described the RRC recovery method according to the embodiment of the present invention, the RRC recovery apparatus according to the embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to fig. 7, an embodiment of the present invention further provides a radio resource control RRC recovery apparatus, which is applied to a network side device, where the network side device may be a base station or other devices communicatively connected to a UE, and the base station is taken as an example in the embodiment of the present invention, and the apparatus includes:

a request receiving module 701, configured to receive an RRC recovery request sent by a terminal UE, and obtain an inactive radio network temporary identity I-RNTI carried in the RRC recovery request; wherein, the I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE.

Referring to fig. 2, when the UE changes from the connected state to the inactive state, the base station sends a radio resource control Release (RRC Release) message to the UE, and the RRC Release message carries a suspend-configuration parameter (suspend-configuration), and the UE enters the inactive state; when the UE is changed from the inactive state to the connected state, an RRC recovery Request (RRC Resume Request) is sent to the base station.

The I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE, wherein the original base station identification number is used for indicating an original service base station of the UE, and the original service cell identification number is used for indicating an original service cell of the UE; as a second example, referring to fig. 3, fig. 3 shows a schematic diagram of an I-RNTI, wherein the I-RNTI is composed of 40bits, and includes an original base station identification number (Gnb-ID in fig. 3) of 22bits, an original serving cell identification number (Flag) of 2bits, and a UE Index identification (Index) of 16 bits.

A type determining module 702, configured to determine an RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type.

The base station determines the RRC recovery type of the UE according to the I-RNTI; specifically, the RRC recovery type includes an inter-base station type, a same-station different-cell type, and/or a same-station same-cell type; the type between the base stations, namely the original service base station connected when the UE enters the RRC non-activated state is not the same base station with the base station; the type of the different cells in the same station, namely the original service cell connected when the UE enters the RRC non-activated state, and the target cell requested to be connected in the RRC recovery request are different cells in the same base station; the same station and the same cell type, namely the original service cell and the target cell are the same cell.

Specifically, the base station firstly judges whether the identification number of the base station is the same as the identification number of the base station according to the original base station identification number carried in the I-RNTI, and if the identification number of the base station is different, the type of the base station is determined; if the cell identification numbers are the same, further judging whether the original service cell identification number is the same as the identification number of the target cell, if not, the cell type is the same station and different cell type; if the same type, the same station and the same cell type are obtained.

An executing module 703 is configured to execute RRC recovery on the UE according to the RRC recovery type.

The base station determines the RRC recovery type of the UE according to the I-RNTI, and then performs RRC recovery on the UE according to different RRC recovery types, so that the base station determines whether to initiate a message of an Xn or Ng interface, acquires the context message of the UE and recovers the context of the UE; when each network entity executes RRC recovery flow processing conveniently, corresponding resources are searched according to the I-RNTI; and (3) distinguishing from the C-RNTI when an RRC establishment Request (RRC Setup Request), when the RRC is abnormal, the recovery of various resources and non-access stratum contexts is convenient.

Optionally, in this embodiment of the present invention, the type determining module 702 includes:

an identification number determination submodule, configured to determine, according to the RRC recovery request, an identification number of a target base station and an identification number of a target serving cell, where the identification number is requested by the UE;

and/or

Optionally, in this embodiment of the present invention, the executing module 703 includes:

a first execution submodule, configured to send a context session request carrying a UE identity number to an original serving cell if the RRC recovery type is an inter-base station type or a same-station inter-cell type and the I-RNTI further includes the UE identity number of the UE in the original serving cell;

and a second execution submodule, configured to send an RRC recovery message to the UE if the RRC recovery type is a same-station same-cell type.

Optionally, in an embodiment of the present invention, the apparatus includes:

a first determining module, configured to, if the UE supports an inactive state, obtain core network assistance information CNAI carried in a preset session message of the UE, and a tracking area identity TAI list of a current serving cell of the UE has a TAI carried in the CNAI, allow the UE to enter the inactive state;

or

Optionally, in an embodiment of the present invention, the apparatus further includes:

The RRC recovery apparatus for radio resource control according to the embodiment of the present invention can implement each process implemented by the RRC recovery apparatus for radio resource control according to the method embodiments in fig. 1 to fig. 6, and is not described herein again to avoid repetition.

In the embodiment of the invention, a request receiving module 701 receives an RRC recovery request sent by a terminal UE, and acquires an inactive radio network temporary identifier I-RNTI carried in the RRC recovery request; the type determining module 702 determines the RRC recovery type of the UE according to the I-RNTI; the RRC recovery type comprises an inter-base station type, a same-station different-cell type and/or a same-station same-cell type; the execution module 703 executes RRC recovery for the UE according to the RRC recovery type; indicating the original base station identification number and the original service cell identification number of the UE on the I-RNTI, so that the base station identifies the RRC recovery type of the UE, is convenient to acquire the context message of the UE, recovers the context of the UE, and searches corresponding resources according to the I-RNTI; the embodiment of the invention solves the problem that the I-RNTI only has the identity identification number of the UE in the prior art.

On the other hand, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, a bus, and a computer program stored in the memory and executable on the processor, where the processor implements the steps in the RRC recovery method when executing the program.

For example, fig. 8 shows a schematic physical structure diagram of an electronic device.

As shown in fig. 8, the electronic device may include: a processor (processor) 810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call logic instructions in the memory 830 to perform the following method:

and performing RRC recovery on the UE according to the RRC recovery type.

In addition, the logic instructions in the memory 830 can be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention or a part thereof which substantially contributes to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In still another aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to, when executed by a processor, perform the radio resource control RRC recovery method provided in the foregoing embodiments, for example, including:

receiving an RRC recovery request sent by a terminal UE, and acquiring an inactive radio network temporary identifier I-RNTI carried in the RRC recovery request; the I-RNTI at least comprises an original base station identification number and an original service cell identification number of the UE;

and performing RRC recovery on the UE according to the RRC recovery type.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A Radio Resource Control (RRC) recovery method is applied to a network side device, and is characterized by comprising the following steps:

performing RRC recovery on the UE according to the RRC recovery type;

before the step of receiving the RRC recovery request sent by the terminal UE, the method includes:

and if the UE supports the inactive state, acquiring Core Network Assistance Information (CNAI) carried in a preset session message of the UE, and allowing the UE to enter the inactive state if a Tracking Area Identifier (TAI) carried in the CNAI exists in a TAI list of a current service cell of the UE.

2. The RRC recovery method of claim 1, wherein the step of determining the RRC recovery type of the UE based on the I-RNTI comprises:

and/or

3. The RRC recovery method of claim 1, wherein the step of performing RRC recovery for the UE according to the RRC recovery type includes:

4. The RRC recovery method of claim 1, wherein the method further comprises:

5. The RRC recovery method of claim 4, wherein after the step of configuring the I-RNTI for the UE, the method further comprises:

and carrying the I-RNTI and the preset suspension control information in an RRC release message, sending the RRC release message to the UE, and starting a context maintenance timer for the UE.

6. A Radio Resource Control (RRC) recovery device applied to a network side device is characterized by comprising:

an execution module, configured to execute RRC recovery for the UE according to the RRC recovery type;

the device further comprises:

a first determining module, configured to, if the UE supports an inactive state, acquire core network assistance information CNAI carried in a preset session message of the UE, and a tracking area identity TAI list of a current serving cell of the UE has a TAI carried in the CNAI, allow the UE to enter the inactive state.

7. The RRC recovery apparatus of claim 6, wherein the type determining module comprises:

and/or

8. The RRC recovery apparatus of claim 6,

the execution module comprises:

9. The RRC recovery apparatus of claim 6, wherein the apparatus further comprises:

10. The RRC recovery apparatus of claim 9, wherein the apparatus further comprises:

11. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, characterized in that the computer program, when executed by the processor, implements the steps of the radio resource control, RRC, recovery method according to any of claims 1 to 5.

12. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the radio resource control, RRC, recovery method according to any one of claims 1 to 5.