CN110831247A

CN110831247A - Communication method and device

Info

Publication number: CN110831247A
Application number: CN201810910275.7A
Authority: CN
Inventors: 梁津垚; 耿婷婷; 张宏卓; 张宏平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-08-10
Filing date: 2018-08-10
Publication date: 2020-02-21

Abstract

The application provides a communication method and a device, and the method comprises the following steps: the method comprises the steps of receiving short I-RNTI from a terminal, sending a request to one or more base stations corresponding to the short I-RNTI and receiving a context of the terminal from a first base station, wherein the bit number of the short I-RNTI is less than that of a full-length I-RNTI, so that the method can be used for obtaining the context of the terminal according to the short I-RNTI sent by the terminal without sending the full-length I-RNTI by the terminal, and the signaling overhead in the process of obtaining the context of the terminal is saved.

Description

Communication method and device

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a communication method and apparatus.

Background

In the standardization of the 5th generation wireless communication system (5G) under study by the third generation partnership project (3 GPP), it is proposed to use a synchronization signal block for mobility measurements. The synchronization signal occupies about 4.5ms of time domain resources in time. Therefore, in order to support mobility measurement based on the synchronization signal block, the base station needs to configure measurement resources for the synchronization signal block. The minimum time domain duration of this measurement resource is 5-6ms in order to include all possible synchronization signal blocks transmitted from different base stations. However, in the 5G study, it is also proposed to use a CSI-RS (channel state information reference signal) for mobility measurement. The CSI-RS occupies a small number of symbols in the time domain and can be randomly dispersed to different time slots.

A new radio interface (NR) is newly introduced in a Radio Resource Control (RRC) state of a new terminal, i.e., an inactive (inactive) state, based on a connected (connected) state and an idle (idle) state. The terminal can request the base station to restore information such as context and the like according to the I-RNTI according to an inactive radio network temporary identifier (I-RNTI) configured for the terminal by the base station for managing the terminal, so as to enter a connected state from an inactive state.

At present, an I-RNTI configured for a terminal by a base station is a full-length I-RNTI, the length is generally 40 bits (bit), and when the terminal recovers from an inactive state to a connected state, the full-length I-RNTI needs to be sent to the base station, so that the base station can obtain the context of the terminal according to the full-length I-RNTI, and the full-length I-RNTI occupies too many air interface signaling.

Disclosure of Invention

The application provides a communication method and a communication device, which aim to solve the problem that an air interface signaling occupied by a full-length I-RNTI sent to a base station by an existing terminal is too much.

In a first aspect, an embodiment of the present application provides a communication method, where a short I-RNTI from a terminal is received, a request is sent to one or more base stations corresponding to the short I-RNTI, and a context of the terminal is received from a first base station, where a bit number of the short I-RNTI is less than a bit number of a full-length I-RNTI, so as to provide a method that can achieve obtaining of the context of the terminal according to the short I-RNTI sent by the terminal, without sending the full-length I-RNTI by the terminal, thereby saving signaling overhead in a process of obtaining the context of the terminal.

In one possible design, subsequent communication with the terminal may be performed after obtaining the context from the terminal, for example, a radio resource control message may be sent to the terminal instructing the terminal to reestablish a connection with the network, or instructing the terminal to remain in an inactive state, or instructing the terminal to switch to an idle state.

In one possible design, the one or more base stations to which the short I-RNTI corresponds may also be determined prior to sending the request to the one or more base stations to which the short I-RNTI corresponds.

In one possible design, one or more base stations corresponding to the short I-RNTI may be determined based on the full-length I-RNTI corresponding to the short I-RNTI. For example, one or more base stations corresponding to the short I-RNTI may be determined according to a first corresponding relationship from at least one base station, where the first corresponding relationship is used to indicate one or more base stations corresponding to the short I-RNTI, and the one or more base stations corresponding to the short I-RNTI are all or part of the at least one base station. At this time, the full-length I-RNTI also indicates a context identifier, the request sent to one or more base stations corresponding to the short I-RNTI may include the full-length I-RNTI, and the obtained context from the terminal of the first base station has the context identifier indicated by the full-length I-RNTI.

In a possible design, one or more base stations corresponding to the short I-RNTI may also be determined according to the interpretation rule corresponding to the short I-RNTI. For example, the interpretation rule corresponding to the short I-RNTI may be determined according to a second corresponding relationship from at least one base station, where the second corresponding relationship indicates the interpretation rule corresponding to the short I-RNTI, and the one or more base stations corresponding to the short I-RNTI are all or part of the at least one base station. At this time, the request sent to the one or more base stations corresponding to the short I-RNTI may include a short I-RNTI from the terminal, where the short I-RNTI indicates at least one context identifier, and the obtained context from the terminal of the first base station has a first context identifier, where the first context identifier is one of the at least one context identifier.

In a possible design, one or more base stations corresponding to the short I-RNTI may also be determined according to a third correspondence relationship from the at least one base station, where the third correspondence relationship indicates one or more base stations corresponding to the short I-RNTI, and the one or more base stations corresponding to the short I-RNTI are all or part of the at least one base station. At this time, the request sent to the one or more base stations corresponding to the short I-RNTI may include the short I-RNTI sent by the terminal, where the short I-RNTI indicates at least one context identifier, and the obtained context from the terminal of the first base station has a first context identifier, where the first context identifier is one of the at least one context identifier.

In one possible design, the request sent to one or more base stations corresponding to the short I-RNTI may also include verification information for verification of the request. Illustratively, the first base station has a correspondence with the authentication information, such that only the first base station can pass the requested authentication.

In one possible design, a paging message may also be sent to the terminal, where the paging message indicates one or more full-length I-RNTIs, and the received short I-RNTI from the terminal corresponds to one of the one or more full-length I-RNTIs.

In one possible design, one or more base stations corresponding to the short I-RNTI from the terminal are a subset of the base stations indicated by the one or more full-length I-RNTIs indicated by the paging message.

In a second aspect, in the embodiment of the present application, a terminal enters an inactive state from a connected state in response to a first message from a first base station, where the first message carries at least one of a short inactive state radio network temporary identifier I-RNTI or a full length I-RNTI configured by the first base station for the terminal, the number of bits of the short I-RNTI is less than that of the full length I-RNTI, and there is a correspondence between the short I-RNTI and the full length I-RNTI; and the terminal responds to a second message from the second base station and sends a short I-RNTI to the second base station, wherein the short I-RNTI is used for the terminal to request to be recovered to a connection state, and the second message comprises the full-length I-RNTI.

By adopting the method, the terminal can respond to the second message from the second base station and send the short I-RNTI to the second base station for the second base station to acquire the context of the terminal, and the bit number of the short I-RNTI is less than that of the full-length I-RNTI, so that the signaling overhead is saved.

In one possible implementation, the full length I-RNTI indicates at least one of an identity of the first base station or a context identity of the terminal.

In a possible implementation manner, the second message includes one or more full-length I-RNTIs, and the one or more full-length I-RNTIs include the full-length I-RNTI in the first message.

In one possible implementation, the second message is a paging message.

In a third aspect, an embodiment of the present application provides a communication method, including: the second base station receives a first corresponding relation from at least one base station, the first corresponding relation indicates at least one full-length I-RNTI corresponding to at least one short I-RNTI, and the full-length I-RNTI indicates a base station identifier; and the second base station determines the full-length I-RNTI corresponding to the short I-RNTI received from the terminal according to the first corresponding relation.

By adopting the method, the interaction of the first corresponding relation can be realized among the base stations.

In a possible implementation, the method further includes:

the second base station sends a request to one or more base stations corresponding to the short I-RNTI, the request is used for requesting the context of the terminal, the one or more base stations corresponding to the short I-RNTI are determined according to the first corresponding relation, and the one or more base stations corresponding to the short I-RNTI are part or all of the at least one base station; and the second base station receives the context from the first base station, wherein the first base station is one of one or more base stations corresponding to the short I-RNTI.

In a possible implementation manner, the full-length I-RNTI further indicates a context identifier, the request includes the full-length I-RNTI corresponding to the short I-RNTI, the full-length I-RNTI corresponding to the short I-RNTI indicates the context identifier, and the context from the first base station has the context identifier indicated by the full-length I-RNTI.

In a possible implementation manner, the first corresponding relationship further indicates one or more base stations corresponding to at least one short I-RNTI, and/or the first corresponding relationship further indicates one or more base stations corresponding to a full-length I-RNTI.

In a possible implementation manner, the request further includes authentication information, and the authentication information is used for authentication of the request.

In one possible design, the second base station further sends a paging message to the terminal, the paging message indicating one or more full-length I-RNTIs, and the received short I-RNTI corresponds to one of the one or more full-length I-RNTIs.

In one possible design, the one or more base stations corresponding to the short I-RNTI are a subset of the one or more full-length I-RNTI indicated base stations indicated by the paging message.

The embodiment of the present application provides another communication method, including: and sending a first corresponding relation to a second base station, wherein the first corresponding relation indicates at least one full-length I-RNTI corresponding to at least one short I-RNTI, and the full-length I-RNTI indicates a base station identifier.

In a possible implementation manner, the method further includes: receiving a request from a second base station, wherein the request is used for requesting the context of a terminal, the request comprises a full-length I-RNTI, and the full-length I-RNTI indicates a context identifier; and sending the context of the terminal to the second base station, wherein the context has a context identifier indicated by the full-length I-RNTI.

In a possible implementation manner, the first corresponding relationship further indicates one or more base stations corresponding to a short I-RNTI, and/or the first corresponding relationship further indicates one or more base stations corresponding to a full-length I-RNTI.

In a possible implementation manner, the method further includes:

sending a first message to a terminal, wherein the first message indicates triggering from a connected state to an inactive state, the first message comprises at least one of a short inactive state radio network temporary identifier I-RNTI or a full length I-RNTI configured for the terminal, the bit number of the short I-RNTI is less than that of the full length I-RNTI, and the short I-RNTI and the full length I-RNTI have a corresponding relation.

In a fourth aspect, an embodiment of the present application provides another communication method, including: the second base station receives a second corresponding relation from at least one base station, wherein the second corresponding relation indicates an interpretation rule corresponding to at least one short I-RNTI, and the interpretation rule is used for determining one or more base stations corresponding to the short I-RNTI; and the second base station determines an interpretation rule corresponding to the short I-RNTI from the terminal according to the second corresponding relation, wherein the short I-RNTI from the terminal is one of at least one short I-RNTI in the second corresponding relation.

By adopting the method, the interaction of the second corresponding relation can be realized among the base stations.

In a possible implementation manner, the second base station determines one or more base stations corresponding to the short I-RNTI from the terminal according to the interpretation rule corresponding to the short I-RNTI, the interpretation rule corresponding to the short I-RNTI is determined according to the second corresponding relationship, and the one or more base stations are part or all of the at least one base station; the second base station sends a request to the one or more base stations, wherein the request is used for requesting the context of the terminal; the second base station receives a context from a first base station, the first base station being one of the one or more base stations.

In one possible implementation, the request includes the short I-RNTI, which indicates at least one context identity, and the context from the first base station has a first context identity, which is one of the at least one context identity.

In a possible implementation manner, the second correspondence further indicates one or more base stations corresponding to the short I-RNTI, and/or the second correspondence further indicates one or more base stations corresponding to the interpretation rule.

In one possible design, the method further comprises: and the second base station sends a paging message to the terminal, wherein the paging message indicates one or more full-length I-RNTIs, and the received short I-RNTI corresponds to one of the one or more full-length I-RNTIs.

The embodiment of the present application provides another communication method, including: and sending a second corresponding relation to a second base station, wherein the second corresponding relation indicates an interpretation rule corresponding to the short I-RNTI, and the interpretation rule information is used for determining one or more base stations corresponding to the short I-RNTI.

In a possible implementation manner, the method further includes: receiving a request from the second base station, wherein the request is used for requesting the context of the terminal and comprises the short I-RNTI which indicates at least one context identifier; and sending the context to the second base station, wherein the context has a first context identifier, and the first context identifier indicates one of at least one context identifier for the short I-RNTI.

In a possible implementation, the request further includes authentication information; the method further comprises the following steps: and verifying the request according to the verification information.

In a possible implementation manner, the method further includes: sending a first message to a terminal, wherein the first message indicates triggering from a connected state to an inactive state, the first message comprises at least one of a short inactive state radio network temporary identifier I-RNTI or a full length I-RNTI configured for the terminal, the bit number of the short I-RNTI is less than that of the full length I-RNTI, and the short I-RNTI and the full length I-RNTI have a corresponding relation.

In a fifth aspect, an embodiment of the present application provides another communication method, including: the second base station receives a third corresponding relation from at least one base station, wherein the third corresponding relation indicates at least one base station corresponding to at least one short I-RNTI; and the second base station determines the base station identification corresponding to the short I-RNTI from the terminal according to the third corresponding relation.

By adopting the method, the interaction of the third corresponding relation can be realized among the base stations.

In a possible implementation, the method further includes: the second base station sends a request to one or more base stations corresponding to the short I-RNTI from the terminal, wherein the request is used for requesting the context of the terminal, the one or more base stations corresponding to the short I-RNTI are determined according to the third corresponding relation, and the one or more base stations are part or all of at least one base station indicated by the third corresponding relation; and the second base station receives the context from the first base station, wherein the first base station is one of one or more base stations corresponding to the short I-RNTI.

In a possible implementation manner, the request includes the short I-RNTI from the terminal, the short I-RNTI indicates at least one context identifier, the context from the first base station has a first context identifier, and the first context identifier is one of the at least one context identifier.

In one possible implementation, the request includes authentication information, and the authentication information is used for authentication of the request.

In one possible design, the method further comprises: and sending a paging message to the terminal, wherein the paging message indicates one or more full-length I-RNTIs, and the received short I-RNTI corresponds to one of the one or more full-length I-RNTIs.

The embodiment of the present application provides another communication method, including: and sending a third corresponding relation to the second base station, wherein the third corresponding relation indicates one or more base stations corresponding to the short I-RNTI.

In a possible implementation manner, the method further includes: receiving a request from the second base station, wherein the request is used for requesting the context of the terminal and comprises a short I-RNTI (identity), and the short I-RNTI indicates at least one context identifier; and sending the context to the second base station, wherein the context has a first context identifier, and the first context identifier is one of at least one context identifier indicated by the short I-RNTI.

In a possible implementation, the request further includes authentication information; further comprising: and verifying the request according to the verification information.

In a sixth aspect, an apparatus is provided. The apparatus provided by the present application has the functionality to implement a terminal or a network device in the above-described method aspect, which comprises means (means) for performing the steps or functionalities described in the above-described method aspect. The steps or functions may be implemented by software, or by hardware (e.g., a circuit), or by a combination of hardware and software.

In one possible design, the apparatus includes one or more processors and a communication unit. The one or more processors are configured to support the apparatus to perform the corresponding functions of the network device in the above method. For example, one or more base stations corresponding to the short I-RNTI are determined. The communication unit is used for supporting the device to communicate with other equipment and realizing receiving and/or sending functions. For example, receiving a short I-RNTI from a terminal, sending a request to one or more base stations to which the short I-RNTI corresponds, and receiving a context of the terminal from a first base station.

Optionally, the apparatus may also include one or more memories for coupling with the processor, which stores program instructions and/or data necessary for the network device. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited.

The apparatus may be a base station, a gNB, a TRP, or the like, and the communication unit may be a transceiver, or a transceiver circuit. Optionally, the transceiver may also be an input/output circuit or interface.

The device may also be a communication chip. The communication unit may be an input/output circuit or an interface of the communication chip.

In another possible design, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, to cause the apparatus to perform the method performed by the first base station or the second base station in any one of the possible implementations of the first aspect or the first aspect, in any one of the possible implementations of the third aspect or the third aspect, in any one of the possible implementations of the fourth aspect or the fourth aspect, in the fifth aspect or the fifth aspect.

In one possible design, the apparatus includes one or more processors and a communication unit. The one or more processors are configured to enable the apparatus to perform a corresponding function of the terminal device in the above method, for example, to enter an inactive state from a connected state in response to a first message from a first base station. The communication unit is used for supporting the device to communicate with other equipment and realizing receiving and/or sending functions. For example, the short I-RNTI is transmitted to a second base station.

Optionally, the apparatus may also include one or more memories for coupling with the processor that hold the necessary program instructions and/or data for the apparatus. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited.

The apparatus may be a smart terminal or a wearable device, and the communication unit may be a transceiver or a transceiver circuit. Optionally, the transceiver may also be an input/output circuit or interface.

In another possible design, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, so that the apparatus performs the method performed by the terminal device in the second aspect or any of the possible implementations of the second aspect.

In a fourth aspect, a system is provided, which includes the terminal device and the network device.

In a fifth aspect, a computer-readable storage medium is provided for storing a computer program comprising instructions for performing the method of the first aspect or any one of the possible implementations of the first, third or third aspect, any one of the possible implementations of the fourth or fourth aspect, or any one of the possible implementations of the fifth or fifth aspect.

A sixth aspect provides a computer-readable storage medium for storing a computer program comprising instructions for performing the method of the second aspect or any one of the possible implementations of the second aspect.

In a seventh aspect, a computer program product is provided, the computer program product comprising: computer program code for causing a computer to perform the method in any of the possible implementations of the first aspect or any of the first, third or third aspects described above, in any of the possible implementations of the fourth aspect or any of the fourth aspect, in any of the possible implementations of the fifth aspect or any of the fifth aspects, when said computer program code is run on a computer.

In an eighth aspect, there is provided a computer program product comprising: computer program code for causing a computer to perform the method of any of the above second aspects and possible implementations of the second aspect when said computer program code is run on a computer.

By the method provided by the embodiment of the application, when the terminal is recovered from the inactive state to the connected state, the context of the terminal can be obtained according to the short I-RNTI sent by the terminal, and the terminal is not required to send the full-length I-RNTI, so that the effect of saving signaling overhead is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a segment I-RNTI provided in an embodiment of the present application;

fig. 2 is a block diagram of a wireless communication system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an NR system according to an embodiment of the present disclosure;

fig. 4 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 5 is a flowchart illustrating another communication method according to an embodiment of the present application;

fig. 6 is a flowchart illustrating another communication method according to an embodiment of the present application;

fig. 7 is a flowchart illustrating another communication method according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

The following explains the words that the present application relates to or may relate to:

1. at least one means one, or more than one, i.e., including one, two, three, and more than one.

2. Carrying may mean that a certain message is used to carry certain information or data, or that a certain message is composed of certain information.

3. An I-RNTI which is an identifier used by a terminal in an inactive state, wherein the terminal can enter the inactive state from a connected state according to a suspend configuration (suspenConfig) configured for the terminal by a source base station for managing the terminal, the I-RNTI is configured for the terminal by the base station in the suspenConfig, and the source base station also keeps the corresponding relation between the I-RNTI and information such as terminal context and the like; when the terminal enters a connected state from an inactive state, the terminal sends the I-RNTI configured before to a target base station which is connected when the connected state is requested to be recovered, if the target base station is still a source base station configured with the I-RNTI, the target base station can quickly determine context and other information of the terminal sending the I-RNTI according to the reserved corresponding relation after receiving the I-RNTI, and then sends a recovery establishment signaling to the terminal to enable the terminal to be switched to the connected state; if the target base station is a base station except the source base station configured with the I-RNTI, after the target base station receives the I-RNTI, the base station identifier indicated by the I-RNTI can be used as the base station identifier of the source base station configured with the I-RNTI for the terminal, so that context and other information of the terminal can be obtained from the source base station, and then the target base station can send a recovery establishment signaling to the terminal to switch the terminal to a connection state.

4. The context mainly comprises some basic information such as the identification of the terminal, the security encryption information and the like, and the core network side stores the terminal context. When the terminal accesses a certain base station, the core network sends the terminal context stored in the core network to the base station, and informs the base station to create the terminal context, so that the identification information of the terminal, the encryption algorithm selection and the like can be conveniently identified when the subsequent terminal and the base station communicate.

5. An air interface indication area (RNA), which is an area where timing offset is not changed, that is, when a terminal moves in the area, timing offset is not changed, and base stations in the area default to having an Xn interface for interaction between the base stations, so that base stations in the RNA range can transmit a terminal context through interaction of the Xn interface. This means that when the terminal moves from the source base station to the target base station within this RNA region, the target base station can directly extract the terminal context from the source base station without the need to trigger the flow of the base station to establish the terminal context with the core network. The configuration information of the RNA region is configured by the base station.

6. The Xn interface refers to an interface used when a base station interacts with other base stations in the same RNA, and when interaction is implemented based on the Xn interface, the base station may follow an Xn Application Protocol (Xn Application Protocol), where n may be a specific numerical value or a letter n.

7. And the verification information can be used for verifying the integrity of the message received by the base station. The verification information may refer to an Integrity Message Authentication Code-Integrity (MAC-I), and the MAC-I may be used by the base station to verify the Integrity of Radio Resource Control (RRC) carrying the MAC-I sent by the terminal, and is also equivalent to verify the authenticity of the RRC request information. The MAC-I is generated by the terminal according to the input parameters transmitted by the base station, where the input parameters include, but are not limited to: a COUNT (COUNT) value, a transmission direction (direction), a bearer identification (bearerID), and a key for RRC integrity protection, such as an RRC integrity protection key (KRRCint). The base station can send the input parameters to the terminal when sending the I-RNTI configured for the terminal to the terminal, so that the terminal can generate MAC-I according to the input parameters, when the subsequent terminal sends messages to the base station, the terminal can carry the MAC-I in the messages, if the base station determines that the MAC-I carried in the messages sent by the terminal is generated according to the input parameters sent by the base station to the terminal, the base station determines that the messages sent by the terminal pass integrity verification, otherwise, the base station determines that the messages sent by the terminal do not pass the integrity verification, and the base station can discard the messages. MAC-I also applies to Xn message authentication between base stations. For example, the target base station sends an Xn request message to the source base station, where the Xn request message carries MAC-I, and the source base station verifies whether the request message of the target base station is real or complete through MAC-I. Only when the source base station verifies the verification information sent by the target base station, the source base station considers that the request message sent by the target base station is real, otherwise, the source base station may discard the request message of the target base station, and further, the request message of the target base station cannot be executed.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: long Term Evolution (LTE) systems, Worldwide Interoperability for Microwave Access (WiMAX) communication systems, future fifth Generation (5th Generation, 5G) systems, such as new radio access technology (NR), and future communication systems, such as 6G systems.

This application is intended to present various aspects, embodiments or features around a system that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.

In addition, in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.

In the embodiment of the present application, "information", "signal", "message", "channel" may be used in combination, and it should be noted that the meaning to be expressed is consistent when the difference is not emphasized. "of", "corresponding", and "corresponding" may sometimes be used in combination, it being noted that the intended meaning is consistent when no distinction is made.

In the embodiment of the present application, sometimes a subscript such as W1 may be mistaken for a non-subscript form such as W1, and its intended meaning is consistent when the distinction is not emphasized.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

The embodiment of the application can be applied to a Time Division Duplex (TDD) scene and can also be applied to a Frequency Division Duplex (FDD) scene.

The embodiment of the application can be applied to a traditional typical network, and can also be applied to a future UE-centric (UE-centric) network. A UE-centric network introduces a network architecture without a cell (Non-cell), that is, a large number of small stations are deployed in a certain area to form a super cell (super cell), and each small station is a Transmission Point (TP) or a TRP of the super cell and is connected to a centralized controller (controller). When the UE moves in the Hyper cell, the network side equipment selects a new sub-cluster for the UE to serve, thereby avoiding real cell switching and realizing the continuity of UE service. The network side device comprises a wireless network device.

In the embodiment of the present application, different base stations may be base stations with different identities, and may also be base stations with the same identity and deployed in different geographic locations. Since the base station does not know whether the base station relates to the application scenario of the embodiment of the present application before the base station is deployed, the base station or the baseband chip should support the method provided by the embodiment of the present application before the base station is deployed. It is to be understood that the base stations with different identities can be base station identities, cell identities, or other identities.

Some scenarios in the embodiment of the present application are described by taking a scenario of an NR network in a wireless communication network as an example, it should be noted that the scheme in the embodiment of the present application may also be applied to other wireless communication networks, and corresponding names may also be replaced by names of corresponding functions in other wireless communication networks.

The embodiment of the application provides a communication method, when a terminal is recovered from an inactive state to a connected state, the terminal sends a short I-RNTI to a base station of a management terminal, and a signaling resource occupied by sending the short I-RNTI is less than a signaling resource occupied by sending a full-length I-RNTI, so that an air interface signaling of the terminal in the process of recovering from the inactive state to the connected state is saved. In the embodiment of the present application, the short I-RNTI may also be referred to as a first I-RNTI and the full-length I-RNTI may also be referred to as a second I-RNTI.

As shown in fig. 1, a 40-bit full-length I-RNTI related to a communication method provided in an embodiment of the present application may include a base station identifier of 20 bits and a context identifier of 20 bits, where the base station identifier may be used to indicate a base station identifier of a base station configuring the full-length I-RNTI for a terminal, and the context identifier may be used to indicate the context identifier of the terminal; the length of the short I-RNTI related to the communication method provided by the embodiment of the application can be less than 40 bits.

For example, the short I-RNTI may have a length smaller than that of the full-length I-RNTI, for example, as shown in fig. 1, the short I-RNTI may be a truncated (truncated) length I-RNTI of 24 bits, and the truncated length I-RNTI may be obtained by truncation according to the full-length I-RNTI (e.g., truncating the base station identifier indicated by the full-length I-RNTI and truncating the context identifier indicated by the full-length I-RNTI, and combining the truncated base station identifier and the truncated context identifier to obtain the truncated length I-RNTI); the short I-RNTI may be an identifier smaller than 40 bits calculated from bits constituting the full-length I-RNTI.

Hereinafter, embodiments of the present application will be described in detail with reference to the drawings. First, a communication system provided in the embodiment of the present application is introduced, then a method for controlling data transmission provided in the embodiment of the present application is introduced, and finally a base station and other apparatuses provided in the embodiment of the present application are introduced.

Fig. 2 is a schematic structural diagram of a wireless communication system 200 according to an embodiment of the present application, where the wireless communication system 200 includes a first network device 201, taking a first base station as an example, a second network device 202, taking a second base station as an example, and a terminal device 203, taking a terminal as an example. The wireless communication system 200 provided in the embodiment of the present application includes, but is not limited to, a Long Term Evolution (LTE) system, a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth Generation (5th Generation, 5G) system, such as a new radio access technology (NR), and a future communication system, such as a 6G system.

The network device is a device with a wireless transceiving function or a chip that can be set in the device, and the device includes but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), wireless fidelity (WIFI) system Access Point (AP), wireless relay Node, wireless backhaul Node, transmission point (TRP or transmission point, TP), etc., and may also be 5G, such as NR, a gbb in the system, or a transmission point (TRP or TP), a set or set of antennas (including multiple antennas) of a base station in the 5G system, or a panel of transmission points (NB, or a BBU), or a distributed Node B (NB), a network controller (RNC), a base transceiver station (BSC), distributed unit), and the like.

In some deployments, the gNB may include a Centralized Unit (CU) and a DU. The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB, and the DU implements part of the function of the gNB, for example, the CU implements the function of a Radio Resource Control (RRC) layer, a Packet Data Convergence Protocol (PDCP) layer, and the DU implements the function of a Radio Link Control (RLC), a Medium Access Control (MAC), and a Physical (PHY) layer. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as RRC layer signaling or PHCP layer signaling, may also be considered to be transmitted by the DU or by the DU + RU under this architecture. It is to be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in the access network RAN, or may be divided into network devices in the core network CN, which is not limited herein.

A terminal device may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self), a wireless terminal in remote medical (remote), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios. The terminal device and the chip that can be installed in the terminal device are collectively referred to as a terminal device in this application.

The first base station 201 shown in fig. 2 is a base station for allocating short I-RNTI and full length I-RNTI to the terminal 203 when the terminal enters an inactive state from a connected state; the second base station 202 may be a base station that receives a short I-RNTI transmitted when the terminal 203 requests to enter a connected state from an inactive state. In practice, the first base station 201 may be located within the same RNA as the second base station 202, where the first base station 201 and the second base station 202 are not the same base station. For example, the terminal 203 may move out of the coverage of the first base station 201 and move to the coverage of the second base station 202 after receiving the short I-RNTI configured for the terminal by the first base station 201 and entering the inactive state.

In an implementation, the first base station 201 and the second base station 202 in the wireless communication system 200 may be located in the same RNA, so that the first base station 201 and the second base station 202 may interact through respective Xn interfaces, for example, the first base station 201 may transmit the context of the terminal to the second base station 202 through the Xn interface. In addition, the embodiment of the present application does not exclude that the first base station 201 and the second base station 202 are not located in the same RNA, and if the first base station 201 and the second base station 202 are not located in the same RNA, the first base station 201 and the second base station 202 may interact with each other in other manners, for example, perform context transmission. For example, the wireless communication system 200 provided by the embodiment of the present application may include the second base station 202 and base stations (including but not limited to the first base station 201) that are all located on the same RNA as the second base station 202.

It should be understood that the above-described wireless communication system 200 may be applied to an NR scenario, as shown in fig. 3, an exemplary NR scenario may include a core network 301 of an NR, and the NR scenario may further include an access network 302 of a new air interface, where the core network 301 of the new air interface and the access network 302 of the new air interface implement interaction through an interface. In the NR scenario, a functional entity for implementing the communication method according to the embodiment of the present application is a base station. Specifically, the terminal 203 according to the embodiment of the present application may include a terminal connected to a network device connected to the new air interface access network 302, for example, the terminal 303 shown in fig. 3, where the terminal 303 is connected to the base station 304 through a wireless link, and the base station 304 may be a network device in the new air interface access network 302; the terminal 203 according to the embodiment of the present application may further include a terminal connected to a relay, for example, the terminal 305 shown in fig. 3, where the terminal 305 is connected to the relay base station 306, and the relay base station 306 is connected to the base station 304 through a relay link. The first base station 201 and/or the second base station 202 according to the embodiment of the present application may be a base station 304 in a new air interface access network 302 as shown in fig. 3, or may be a relay base station 306 connected to the base station 304 as shown in fig. 3.

Taking the wireless communication system 200 shown in fig. 2 as an example, a communication method provided in an embodiment of the present application may include the steps shown in fig. 4:

step S101: the second base station 202 receives a short I-RNTI from the terminal 203, the number of bits of which is less than the number of bits of the full length I-RNTI;

step S102: the second base station 202 sends a request to one or more base stations corresponding to the short I-RNTI from the terminal, wherein the request is used for requesting the context of the terminal;

step S103: after receiving a request from a second base station 202, a first base station 201 sends a context of a terminal 203 to the second base station 202, wherein the first base station 201 is one or more of one or more base stations corresponding to a short I-RNTI;

step S104: the second base station 202 receives the context of the terminal 203 transmitted by one or more of the one or more base stations.

By adopting the above method, the second base station 202 can obtain the context of the terminal 203 according to the short I-RNTI sent by the terminal 203, so that the terminal 203 does not need to send the full-length I-RNTI to the second base station 202 any more, wherein the number of bits of the short I-RNTI is less than that of the full-length I-RNTI, thereby saving signaling overhead.

It is to be understood that the first base station 201 involved in the method as shown in figure 4 is a base station that configures a terminal 203 with a short I-RNTI or a full length I-RNTI. The first base station 201 may transmit at least one of a short I-RNTI or a full length I-RNTI configured for the terminal 203 to the terminal 203 through the first message.

For example, the short I-RNTI transmitted by the terminal 203 may be generated by a base station (e.g., the base station involved in step S103) storing the context of the terminal 203, and the length of the short I-RNTI may be 24 bits. One possible implementation manner is that, in the process that the terminal 203 enters the inactive state from the connected state, the base station generates a short I-RNTI (for example, 24bit) according to partial information (for example, 12bit) of a base station identifier (for example, 20bit) of the base station and partial information (for example, 12bit) of a context identifier (for example, 20bit) of the terminal 203, and then the base station configures the short I-RNTI to the terminal 203; or, the base station performs operation by a certain algorithm according to a base station identifier (e.g. 20bit) of the base station and a context identifier (e.g. 20bit) of the terminal 203, generates a short I-RNTI (e.g. 24bit), and configures the short I-RNTI to the terminal 203; or, the base station may generate a full length I-RNTI (40 bits) according to a base station identifier (e.g., 20 bits) of the base station and a context identifier (e.g., 20 bits) of the terminal 203, then perform an operation according to the 40bit full length I-RNTI by a certain algorithm to generate a short I-RNTI (e.g., 24 bits), and configure the short I-RNTI to the terminal 203.

The short I-RNTI may be a full-length I-RNTI derived from a functional operation rule. Specifically, how to obtain the short I-RNTI from the full-length I-RNTI is as follows:

and intercepting partial bits from the full-length I-RNTI to obtain a short I-RNTI. For example, the first 12 bits are intercepted from the first 20 bits of the full-length I-RNTI, and the first 12 bits are intercepted from the last 20 bits to form a 24-bit short I-RNTI; or, the last 12 bits are truncated from the first 20 bits of the full-length I-RNTI, and the last 12 bits are truncated from the last 20 bits, so as to form a 24-bit short I-RNTI, and the like. This is equivalent to performing a sum operation with the full length I-RNTI and a mask consisting of 0 and 1, and deleting the bit corresponding to the position of 0 from the result to obtain the short I-RNTI.

And calculating according to the full-length I-RNTI to obtain a short I-RNTI. For example, the full-length I-RNTI is subjected to XOR operation every 2 bits to obtain a 20-bit short I-RNTI, or the full-length I-RNTI is subjected to AND operation every 2 bits to obtain a 20-bit short I-RNTI, or the full-length I-RNTI is subjected to XOR operation every 2 odd bits to obtain a 20-bit short I-RNTI every 2 even bits.

For another example, the short length I-RNTI is obtained by XOR of corresponding bits and deletion of 12 th to 19 th bits and 32 th to 39 th bits according to a mask consisting of the full length I-RNTI and 0 and 1. Then according to the algorithm/formula, the short I-RNTI and the corresponding mask carry out XOR operation of corresponding bits at 0 th to 11 th bits and 20 th to 31 th bits, and 0 is complemented at 12 th to 19 th bits and also 32 th to 39 th bits to determine some possible source base stations. For another example, if the short length is extracted from the full length, then according to the algorithm/formula, the short length may be complemented by 0 at other locations to determine some possible source base stations.

Before the implementation of the step shown in S101, the second base station 202 may send a second message, for example, a paging message to the terminal 203, and carry 203 a full-length I-RNTI of the terminal in the paging message, where the full-length I-RNTI may indicate an identifier of the first base station 201 that generates the I-RNTI for the terminal 203 and/or a context identifier of the terminal 203, and the full-length I-RNTI may be used for the terminal 203 to send a short I-RNTI to the second base station 202 after receiving the paging message and determining that the paging message includes its own full-length I-RNTI, where the terminal 203 may carry a short I-RNTI in a response message sent to the second base station 202, where the response message may be a message for requesting RRC connection recovery, such as a radio resource control recovery request (RRCresumeRequest). The second base station 202 may also carry the full-length I-RNTIs of other terminals in the second message, i.e. the full-length I-RNTIs of one or more terminals are carried in the paging message.

In an implementation, the terminal 203 may further carry verification information in a response message sent to the second base station 202, where the verification information is used by the base station (which may also be a base station storing the context of the terminal) that configures the short I-RNTI for the terminal 203 to verify the integrity of the message sent by the terminal. Specifically, the verification information may be generated by the terminal 203 according to input parameters transmitted by the base station, wherein the input parameters are transmitted by the base station to the terminal 203 when configuring the short I-RNTI for the terminal 203.

Before the implementation of the step shown in S102, the second base station 202 may further determine one or more base stations corresponding to the short I-RNTI sent by the terminal 203, and in the step shown in S102, the second base station 202 may send a request to the one or more base stations corresponding to the short I-RNTI. In the communication method provided in the embodiment of the present application, there are various ways for the second base station 202 to determine one or more base stations corresponding to the short I-RNTI sent by the terminal 203, which are described below by way of example.

In one possible implementation manner, the second base station 202 may determine one or more base stations corresponding to the short I-RNTI according to the full-length I-RNTI corresponding to the short I-RNTI, where the full-length I-RNTI corresponding to the short I-RNTI may be used to indicate the one or more base stations (e.g., the full-length I-RNTI corresponding to the short I-RNTI may carry the base station identifier of one or more base stations). In an implementation, the second base station 202 may determine a full-length I-RNTI corresponding to the short I-RNTI according to a first corresponding relationship, where the first corresponding relationship may be a corresponding relationship between the short I-RNTI and the full-length I-RNTI, and the first corresponding relationship may be used by the second base station 202 to determine the full-length I-RNTI corresponding to the short I-RNTI sent by the terminal 203, and the first corresponding relationship may be from the first base station 201 or another base station, or may be preconfigured in the second base station 202.

In an implementation, the first correspondence may indicate a one-to-one correspondence between short I-RNTIs and full length I-RNTIs. Specifically, the first corresponding relationship indicates a corresponding relationship between a short I-RNTI and a full-length I-RNTI allocated by the first base station 201 for the terminal, so that the second base station 202 can determine the full-length I-RNTI corresponding to the short I-RNTI sent by the terminal 203 according to the first corresponding relationship, where the full-length I-RNTI indicates a base station that configures the short I-RNTI and the full-length I-RNTI for the terminal 203 (for example, the full-length I-RNTI includes a base station identifier of the base station); the full-length I-RNTI may also indicate a context of the terminal 203 (e.g., the full-length I-RNTI includes a context identification of the terminal 203). Also in an implementation, the first correspondence may be a relation between a base station identity and a base station configured I-RNTI for a terminal (including but not limited to terminal 203), e.g. the first correspondence comprises a correspondence between a base station identity and a short I-RNTI, or the first correspondence comprises a correspondence between a base station identity and a full length I-RNTI, or the first correspondence comprises a correspondence between a base station identity, a short I-RNTI, and a full length I-RNTI.

In addition, in the implementation, the first base station 201 may transmit the first corresponding relationship to the second base station 202 as shown in fig. 1, so that the second base station 202 may receive the first corresponding relationship transmitted by the first base station 201 before the step shown in S101 or S102. The Xn signaling carrying the first corresponding relationship may be RAN paging information, or may be other Xn signaling, such as Xn Setup request signaling, Xn Setup Response signaling, and the like. In one implementation, the first base station 201 may send the first corresponding relationship to all or a part of base stations (including but not limited to the second base station 202) located in the same RNA as the first base station 201 through an Xn interface, so that the base station determines the full-length I-RNTI corresponding to the short I-RNTI according to the first corresponding relationship after receiving the short I-RNTI sent by the terminal. Specifically, the first base station 201 may send an Xn radio access network paging (paging) message to all base stations located in the same RNA through Xn, and carry the first corresponding relationship therein, or may be other Xn signaling, and a specific form of the Xn signaling is not limited.

Illustratively, the Xn radio access network paging message may include the contents shown in table 1:

table 1-Xn radio access network paging message (1)

As shown in table 1, an information element IE may be newly added in the Xn radio access network paging message (1): the I-RNTI information is used to indicate the first corresponding relationship, such as carrying the short I-RNTI and the full length I-RNTI corresponding to the short I-RNTI, where the I-RNTI may carry the short I-RNTI of the terminal paged by the first base station 201 and the full length I-RNTI corresponding to the short I-RNTI, or may carry all the short I-RNTIs possessed by the first base station 201 and the full length I-RNTI corresponding to the short I-RNTI. Wherein, the presence of the IE can be set as M, and the semantic description of the IE can be "contents botfull I-RNTI and truncated I-RNTI" by taking truncated length I-RNTI as an example. The radio access network paging message as shown in table 1 may further include other IEs, such as one or more of the following IEs, e.g., UE Identity Index Value, for indicating the Identity of the UE itself; the UE RAN Paging Identity may be used to carry an I-RNTI Identity of a Paging terminal, where the I-RNTI Identity refers to at least one of a short I-RNTI or a full length I-RNTI described in this embodiment of the present application. The UE RAN Paging Identity may not be used to carry the first corresponding relationship according to the embodiment of the present application, or may carry the first corresponding relationship in the UE RAN Paging Identity, for example, the UE RAN Paging Identity may carry a short I-RNTI of a terminal paged by the first base station 201 and a full-length I-RNTI corresponding to the short I-RNTI, and at this time, the I-RNTI information cell may not be included, or the I-RNTI information cell may be used as a sub-cell of the UE RAN Paging Identity cell; the Paging DRX may be configured to carry specific configuration information when Paging information is received discontinuously, for example, a DRX cycle; the RAN Paging Area may be configured to carry Paging range information, which refers to what the range of Paging initiated at an air interface is, for example, which cells (cells) the Paging is initiated at, which radio access network areas (RAN areas) the Paging is initiated at; the paging priority is used for carrying paging priority information, which refers to priority configuration when the neighboring base station initiates a paging, for example, which cells initiate the paging preferentially; assistance Data for Paging, which is used to carry Paging Assistance new Data, is Assistance Data for assisting neighboring base stations to initiate Paging.

In addition, in the implementation, an IE may be added to the Xn radio access network paging message as shown in table 1: the Source base station identity (Source gNB ID) is used to carry a base station identity, as shown in table 1, the Presence of the IE is O, and the base station identity may be a base station identity of the first base station 201 corresponding to the short I-RNTI or the full length I-RNTI carried in the same Xn radio access network paging message. The base station identity may also be an identity of the base station in the whole network (global ID, global identity, general base station identity with a bit number greater than that of the full length I-RNTI). The base station identifier may also be an identifier of an Xn interface (XnAP ID, Xn access point identifier).

In an implementation, the second base station 202 may determine one or more full-length I-RNTIs corresponding to the short I-RNTI sent by the terminal 203 according to the received first correspondence from the first base station 201.

Specific examples are: I-RNTI set configured by at least one source base station (including but not limited to the first base station 201) -common N set: { full length I-RNTI1, short I-RNTI1}, { full length I-RNTI2, short I-RNTI2} … { full length I-RNTI N, short I-RNTI N }, the source base station sends N sets of I-RNTI sets to the second base station 202 via the Xn interface.

The second base station 202 sends paging information over the air interface, where the paging information carries an I-RNTI, and the I-RNTI may be a full-length I-RNTI, for example. More than one full-length I-RNTI may be carried in the general paging information. For example, the second base station 202 carries full-length I-RNTI1, full-length I-RNTI2, and full-length I-RNTI3 in the paging message (second message). The terminal 203 receives the paging information, matches whether one of the full-length I-RNTIs 1,2 and 3 carried therein is the same as the I-RNTI stored by itself, and if so, the terminal 203 initiates response information, such as radio resource control recovery request signaling. In the response information transmitted to the second base station 202, the terminal 203 may carry the short I-RNTI. For example, when the terminal 203 finds that the full-length I-RNTI1 is the same as the full-length I-RNTI thereof, the terminal 203 reports its short I-RNTI1 in the response message sent to the second base station 202. the second base station 202 matches multiple sets of I-RNTI sets at the second base station 202 side according to the short I-RNTI reported by the terminal 203, for example, the short I-RNTI1 reported by the terminal 203 is the same as the short I-RNTI1 in the { full-length I-RNTI1, short I-RNTI1}, so that the second base station 202 can determine that the full-length I-RNTI of the terminal 203 is the full-length I-RNTI 1. The second base station 202 can obtain the unique source base station identity and the terminal 203context identity by parsing the full length I-RNTI 1.

The second base station 202 in turn requests the Context of the terminal 203 from the source base station, e.g. a signaling Retrieve UE Context Request over an Xn interface (get terminal 203Context Request). After verifying the request of the second base station 202, the source base station feeds back the context of the terminal 203 to the second base station 202, for example, through signaling Retrieve UEContext Response of an Xn interface (obtaining the context Response of the terminal 203). After the second base station 202 obtains the context of the terminal 203, the context and the terminal 203 are used to perform subsequent communication, for example, the second base station 202 sends an air interface RRC signaling to instruct the terminal 203 to reestablish a connection, or keep an inactive state, or enter an idle state.

One implementation is as follows:

the first corresponding relation may comprise a short I-RNTI and a full length I-RNTI corresponding to the short I-RNTI. The second base station 202 may back-derive the short I-RNTI sent by the terminal 203 to the corresponding one or more full-length I-RNTIs according to the received first correspondence from the first base station. The second base station 202 determines one or more potential first base stations 201 by combining with the full-length I-RNTI carried in the air interface paging information sent by the first base station. Equivalently, the second base station 202 determines the potential source base station together according to the first corresponding relationship and the air interface paging message. It can be understood that, when determining the potential source base station, the second base station 202 considers the base station identifier indicated by the I-RNTI of the terminal paged in the air interface paging message, and in other embodiments of the present application, for example, when determining the potential source base station by using the second correspondence or using the third correspondence, the method may also be applied, and details are not described in other embodiments.

Specific examples are: the source base station 1 (a first base station 201) sends the UE identity I-RNTI1 to be paged and an I-RNTI group { short I-RNTI1, full-length I-RNTI1} { short I-RNTI2, full-length I-RNTI2} configured by the source base station 1 to the second base station 202; the source base station 2 (another first base station 201 except the source base station 1) sends the UE identity I-RNTI3 to be paged and an I-RNTI group { short I-RNTI3, full-length I-RNTI3} { short I-RNTI4, full-length I-RNTI4} configured by the source base station 2 to the second base station 202; the source base station 3 (another first base station 201 except the source base station 1 and the source base station 2) sends the UE identity I-RNTI6 to be paged and an I-RNTI group { short I-RNTI5, full-length I-RNTI5} { short I-RNTI6, full-length I-RNTI6} configured by the source base station 3 to the second base station 202 (also called a target base station). In these I-RNTI groups, short I-RNTI1 is short I-RNTI 5. The target base station carries { full-length I-RNTI1, full-length I-RNTI3, full-length I-RNTI6} in the air interface paging message, so the air interface paging message indicates one or more full-length I-RNTIs 1, the one or more full-length I-RNTIs 1 respectively indicate the source base station 1, the source base station 3 and the source base station configured with the full-length I-RNTI6, and therefore the air interface paging message also indicates the base stations. If the UE1 feeds back the short I-RNTI1, the short I-RNTI may correspond to the full-length I-RNTI1 and the full-length I-RNTI5 according to the first corresponding relationship, and the potential first base stations 201 are base stations 1 and 3, so that the first base station 201 (one or more base stations corresponding to the short I-RNTI1 fed back by the UE 1) is a subset of the base stations indicated by the one or more full-length I-RNTIs 1 indicated by the air interface paging message. Because the paging message sent by the target base station carries the full-length I-RNTI1 but does not carry the full-length I-RNTI5, the first base station 201 configuring the short I-RNTI for the UE1 can only be the base station 1.

In another embodiment, after acquiring the context of the terminal 203, the second base station 202 may further send RRC information to the terminal 203 according to other conditions, such as the congestion condition of the current network, and if the RRC information is the establishment information, the terminal 203 discards the context stored by itself and establishes connection with the network again; if the RRC message is release information carrying interrupt configuration information, such as an rrcreate message carrying a suspennconfig cell, the terminal 203 stores its context and keeps it inactive; if the RRC signaling does not carry the release information of the interrupt configuration, the terminal 203 discards the context stored by itself, and becomes an idle terminal. Wherein the interrupt configuration cell may indicate that the terminal continues to remain in the inactive state. It can be understood that the behavior of the second base station 202 after obtaining the context of the terminal 203 may also be applicable in other embodiments of the present application, for example, when the potential source base station is determined by using the second corresponding relationship or using the third corresponding relationship, and is not described in detail in other embodiments.

In a possible implementation manner, the second base station 202 may determine one or more base stations corresponding to the short I-RNTI according to the interpretation rule corresponding to the short I-RNTI from the terminal 203, where the interpretation rule corresponding to the short I-RNTI may be used to determine the one or more base stations corresponding to the short I-RNTI. In one implementation, the second base station 202 may determine one or more base stations corresponding to the short I-RNTI according to a second corresponding relationship (e.g., determine a base station identifier of the one or more base stations corresponding to the short I-RNTI according to the second corresponding relationship), where the second corresponding relationship may be a corresponding relationship between the short I-RNTI and information of the interpretation rule, the short I-RNTI from the terminal 203 is one of at least one short I-RNTI in the second corresponding relationship, the second corresponding relationship may be used by the second base station 202 to determine the interpretation rule corresponding to the short I-RNTI sent by the terminal 203, and the second corresponding relationship may be from the first base station 201 or another base station, or may be preconfigured in the second base station 202.

In an implementation, the interpretation rule may indicate part of the information of the base station identity of the first base station 201 comprised by the short I-RNTI and part of the information of the context identity of the terminal 203 comprised by the short I-RNTI. As shown in table 2, the interpretation rule may further have a rule identifier (rule ID), and interpretation rules having different rule identifiers may be the same or different from one another, and may be indicated by the rule identifier.

TABLE 2 interpretation rules Table

Specifically, if the second base station 202 receives the short I-RNTI from the terminal 203, and the second base station 202 determines the rule identifier 1 of the interpretation rule corresponding to the short I-RNTI according to the second correspondence relationship, according to table 2, the interpretation rule indicated by the rule identifier 1 includes: the first 12 bits of the short I-RNTI are partial information of the base station identifier, namely the base station identifier comprises the first 12 bits of the short I-RNTI and the last 12 bits of the short I-RNTI are partial information of the context identifier of the terminal. When the second base station 202 determines the base station identities of at least one or more base stations corresponding to the short I-RNTI according to the interpretation rule, the one or more base station identities determined according to the first 12 bits of the short I-RNTI may be used as the base station identities of the one or more base stations corresponding to the short I-RNTI (i.e. the context identity including the first 12 bits of the short I-RNTI of the terminal 203), where the base station identities of the one or more base stations include the base station identity of the base station configuring the short I-RNTI for the terminal 203. In addition, the second base station 202 may further determine at least one context identifier corresponding to the short I-RNTI (i.e. the context identifier of the last 12 bits of the short I-RNTI of the terminal 203) according to the interpretation rule, where the at least one context identifier includes the context identifier of the terminal 203.

In further implementations, the interpretation rule may also indicate an algorithm/formula according to which the short I-RNTI is generated from the bits constituting the full-length I-RNTI. Thus, bits constituting the full-length I-RNTI can be obtained by reverse extrapolation according to the interpretation rule and the short I-RNTI, and further, the terminal 203 uses one or more base station identities indicated by the obtained one or more full-length I-RNTIs as the base station identities of the one or more base stations. In an implementation, these algorithmic forms of the interpretation rules may also have corresponding rule identifications to indicate the interpretation rules.

In an implementation, the second corresponding relationship may be a corresponding relationship between the short I-RNTI and the rule identifier of the interpretation rule, and at this time, the second base station 202 may determine the interpretation rule indicated by the rule identifier according to a preconfigured or pre-received interpretation rule table, where the interpretation rule table may be as shown in table 2, and the interpretation rule in the interpretation rule table may also include an algorithm according to which the short I-RNTI is generated according to bits constituting the full-length I-RNTI; alternatively, the second corresponding relationship may be a corresponding relationship between the short I-RNTI and the interpretation rule, and the interpretation rule in this case may be one of a column of interpretation rules in the interpretation rule table shown in table 2.

In addition, in an implementation, the second correspondence may be a correspondence between a base station identifier and an I-RNTI configured by the base station for the terminal (including but not limited to the terminal 203), for example, the second correspondence includes a correspondence between the base station identifier and a short I-RNTI, or the second correspondence includes a correspondence between the base station identifier and a full-length I-RNTI, or the second correspondence includes a correspondence between the base station identifier, a short I-RNTI, and a full-length I-RNTI. The first base station 201 may transmit the second correspondence to the second base station 202 as shown in fig. 1, so that the second base station 202 may receive the second correspondence transmitted by the first base station 201 before the step shown in S101 or S102. In one implementation, the first base station 201 may send the second correspondence to all base stations (including but not limited to the second base station 202) located in the same RNA as the first base station 201 through an Xn interface, so that the base station determines the interpretation rule corresponding to the short I-RNTI and/or the rule identifier of the interpretation rule according to the second correspondence after receiving the short I-RNTI sent by the terminal. Specifically, the first base station 201 may send an Xn RAN paging message to all or some base stations located in the same RNA through Xn, and carry the second correspondence therein, and the Xn signaling may also be other signaling, and the specific signaling form is not limited. Illustratively, the Xn radio access network paging message may include the following table 3:

table 3-Xn radio access network paging message (2)

In implementation, an IE may be added in the radio access network paging message (2) as shown in table 3: rule ID, where Presence of the IE is O, is used to carry a Rule identifier of an interpretation Rule, and the Rule identifier may be a Rule identifier corresponding to a short I-RNTI carried in a paging message of the same Xn radio access network. It can be understood that the Rule ID may be all Rule IDs possessed by the first base station 201, or may be a Rule ID corresponding to an I-RNTI of a terminal paged by the first base station 201. The radio access network paging message as shown in table 3 may further include other IEs, such as one or more of the following IEs, e.g., UE identity index Value, for indicating the identity of the UE itself; the UE RAN Paging Identity may be used to carry an I-RNTI Identity of a Paging terminal, where the I-RNTI Identity refers to at least one of a short I-RNTI or a full length I-RNTI described in this embodiment of the present application. The UE RAN Paging Identity may not be used to carry the second corresponding relationship related to the embodiment of the present application, or may carry the second corresponding relationship in the UE RAN Paging Identity, for example, carry a Rule ID corresponding to an I-RNTI of a terminal paged by the first base station 201, where the Rule ID cell may not be present, or the Rule ID cell may be used as a sub-cell of the UE RAN Paging Identity cell; the Paging DRX may be configured to carry specific configuration information when Paging information is received discontinuously, for example, a DRX cycle; the RAN Paging Area may be configured to carry Paging range information, which refers to what the range of Paging initiated at an air interface is, for example, which cells (cells) the Paging is initiated at, which radio access network areas (RAN areas) the Paging is initiated at; the paging priority is used for carrying paging priority information, which refers to priority configuration when the neighboring base station initiates a paging, for example, which cells initiate the paging preferentially; assistance Data for Paging, which is used to carry Paging Assistance new Data, is Assistance Data for assisting neighboring base stations to initiate Paging.

In addition, in the implementation, an IE may be added in the radio access network paging message (2) as shown in table 3: the sourcegbb ID is used to carry a base station identifier, as shown in table 3, the Presence of the IE is O, and the base station identifier may be a base station identifier of the first base station 201 corresponding to the short I-RNTI or the full length I-RNTI carried in the same Xn radio access network paging message.

In an implementation, the second base station 202 may determine, according to the second correspondence received from the first base station, an interpretation rule corresponding to the short I-RNTI sent by the terminal 203, and the second base station 202 may determine, according to the interpretation rule and the short I-RNTI, a base station identifier corresponding to the short I-RNTI and one or more base stations.

One implementation is as follows:

the second corresponding relationship may be a corresponding relationship between the short I-RNTI and the rule identifier of the interpretation rule, and specifically may be a { full length I-RNTI, rule ID } group, and the source base station (including but not limited to the first base station 201) sends the { full length I-RNTI, rule ID } group to the second base station 202 through the Xn interface. For example, the source base station sends N sets of information to the second base station 202: { full-length I-RNTI1, rule ID 1}, { full-length I-RNTI2, rule ID 2} … { full-length I-RNTI N, rule IDN }.

The second base station 202 sends paging information over an air interface, where the paging information carries an I-RNTI, and the I-RNTI may be a full-length I-RNTI, for example. Typically, more than one full-length I-RNTI is carried in the paging message. For example, the second base station 202 transmits full length I-RNTI1, full length I-RNTI2, and full length I-RNTI 3. The terminal 203 receives the paging information, finds that one of the full-length I-RNTIs 1,2, 3 carried therein is the same as the I-RNTI stored by itself, and then the terminal 203 initiates response information, such as rrcresemequest signaling. In the response message, the terminal 203 reports the truncation length I-RNTI. For example, when the terminal 203 finds that the full-length I-RNTI1 is the same as the full-length I-RNTI thereof, the terminal 203 reports the short I-RNTI1 thereof in the response message, and the second base station 202 decodes the short I-RNTI1 reported by the terminal 203 according to the plurality of rule IDs. For example, terminal 203 interprets short I-RNTI1 according to rule ID1, identifies potential source base stations based on the first 12 bits, and identifies potential terminal 203 contexts based on the last 12 bits (e.g., identifies potential contexts); the terminal 203 interprets the short I-RNTI1 according to the rule ID2, determines some potential source base stations according to the first 10 bits, and determines some potential terminal 203 contexts according to the last 14 bits; terminal 203 interprets short I-RNTI1 according to rule ID3, determines some potential source base stations from the first 16 bits, some potential terminal 203 contexts from the last 8 bits, and so on. Then second base station 202 may determine a set of potential source base stations and, therefore, a set of potential terminals 203 contexts.

The second base station 202 attempts to fetch the terminal 203context in turn from the potential source base station, because the second base station 202 sends the request to the source base station to obtain the context, the second base station 202 also sends verification information, for example, verification information for verifying integrity, such as shortMAC-I verification information, the source base station verifies the request sent by the second base station 202, and only if the request is determined to pass the verification and the source base station having the corresponding terminal 203context, the terminal 203context is sent to the second base station 202, for example, the source base station sends the terminal 203context to the second base station 202 through Xn signaling. Generally, when the second base station 202 attempts to access a plurality of source base stations and a plurality of terminals 203context, only one terminal 203context of one source base station is authenticated by the authentication information and fed back to the second base station 202, and the source base station is the first base station 201.

In an implementation, the second base station 202 may receive an identification of the interpretation rule for the short I-RNTI from the terminal 203 and/or an interpretation rule for interpreting the short I-RNTI from a base station configured by a gateway network element. Then the second base station 202 determines how the short I-RNTI reported by the terminal 203 is to be interpreted. Then the second base station 202 may reduce the range of the potential source base station. Specific examples are: the second base station 202, through the configuration of the gateway, determines that the interpretation rules of the base station in the area to the short I-RNTI are all rule ID1, so that the second base station 202 will interpret the first 12 bits as the base station identifier and interpret the second 12 bits as the terminal 203context identifier. This reduces the range of potential source base stations compared to the second base station 202 also trying multiple interpretation rules.

In a possible implementation manner, the second base station 202 may determine the base station identifier corresponding to the short I-RNTI according to a third corresponding relationship, where the third corresponding relationship may be a corresponding relationship between the short I-RNTI and the base station identifier, and the third corresponding relationship may be from the first base station 201 or another base station, or may be preconfigured in the second base station 202.

In an implementation, the third correspondence may indicate a one-to-one correspondence between the short I-RNTI and the base station identity. Specifically, the third correspondence may be determined by the first base station 201 after generating the short I-RNTI for the terminal (including but not limited to the terminal 203), which indicates a correspondence between the short I-RNTI assigned by the first base station 201 for the terminal and the base station identity of the first base station 201.

In addition, in an implementation, the first base station 201 may transmit the third corresponding relationship to the second base station 202 as shown in fig. 1 after generating the third corresponding relationship, so that the second base station 202 may receive the third corresponding relationship transmitted by the first base station 201 before the step shown in S101 or S102. In an implementation manner, the first base station 201 may send the third correspondence to all base stations (including but not limited to the second base station 202) located in the same RNA as the first base station 201 through an Xn interface, so that the base station determines the full-length I-RNTI corresponding to the short I-RNTI according to the third correspondence after receiving the short I-RNTI sent by the terminal. Specifically, the first base station 201 may send an Xn ranging message to all or some base stations located in the same RNA through Xn, and carry a third correspondence therein, and the Xn signaling may also be in other forms, which is not limited.

Illustratively, the Xn radio access network paging message may include the following table 4:

table 4-Xn radio access network paging message (3)

In implementation, an IE may be added in the radio access network paging message (3) as shown in table 4: the Source gNB ID is used to carry a base station identifier, as shown in table 4, the Presence of this IE is O, and the base station identifier may be a base station identifier of the first base station 201 corresponding to the short I-RNTI or the full length I-RNTI carried in the same Xn radio access network paging message. The radio access network paging message as shown in table 4 may further include other IEs, such as one or more of the following IEs, e.g., UE Identity IndexValue, for indicating the Identity of the UE itself; the UE RAN Paging Identity may be used to carry an I-RNTI Identity of a Paging terminal, where the I-RNTI Identity refers to at least one of a short I-RNTI or a full length I-RNTI described in this embodiment of the present application. The UE RAN Paging Identity may not be used to carry the third corresponding relationship related to the embodiment of the present application, or may carry the third corresponding relationship in the UE RAN Paging Identity, for example, a Source gnnb ID corresponding to an I-RNTI of a terminal paged by the first base station 201 is carried, and at this time, the Source gnnb ID cell may not be present, or the Source gnnb ID cell may be used as a sub-cell of the UE RAN Paging Identity cell; the Paging DRX may be configured to carry specific configuration information when Paging information is received discontinuously, for example, a DRX cycle; the RAN Paging Area may be configured to carry Paging range information, which refers to what the range of Paging initiated at an air interface is, for example, which cells (cells) the Paging is initiated at, which radio access network areas (RAN areas) the Paging is initiated at; the Paging Priority is used for carrying Paging Priority information, and refers to Priority configuration when the neighboring base station initiates a Paging, for example, which cells initiate a Paging preferentially; assistance Data for Paging, which is used to carry Paging Assistance new Data, is Assistance Data for assisting neighboring base stations to initiate Paging.

In an implementation, the second base station 202 may determine the base station identifier corresponding to the short I-RNTI sent by the terminal 203 according to the received third correspondence from the first base station 201.

One implementation is as follows:

the third correspondence may be a correspondence between a short I-RNTI generated by a source base station (including but not limited to the first base station 201) and a base station identity of the source base station, where the third correspondence may include a correspondence between a short I-RNTI of the terminal 203 and a base station identity of the first base station 201, and may be used for the second base station 202 to determine the base station identity of the first base station 201 according to the short I-RNTI from the terminal 203. The third correspondence may further comprise a correspondence between a short I-RNTI other than the short I-RNTI of the terminal 203 and the base station identity of the first base station 201 and/or a correspondence between a short I-RNTI other than the short I-RNTI of the terminal 203 and the base station identity of a base station other than the first base station 201.

In an implementation, the source base station may send the short I-RNTI and the source base station ID configured for the UE to the second base station 202 through the Xn interface, and specifically, may send the { short I-RNTI1, base station identity } group to the second base station 202. For example, at least one source base station sends N sets of information to the second base station 202: { short I-RNTI1, base station ID 1}, { short I-RNTI2, base station ID 2} … { short I-RNTIN, base station ID N }, N being a positive integer.

The second base station 202 may send paging information over the air interface, where the paging information carries an I-RNTI, and the I-RNTI may be a full-length I-RNTI, for example. More than one full-length I-RNTI is carried in the general paging information. For example, the second base station 202 transmits full length I-RNTI1, full length I-RNTI2, and full length I-RNTI 3. The terminal 203 receives the paging information, finds that one of the full-length I-RNTIs 1,2, and 3 carried therein is the same as the I-RNTI stored by itself, and then the terminal 203 initiates response information, such as rrcresemequest signaling. In the response message, the terminal 203 may report the short I-RNTI. For example, if the terminal 203 finds that the full-length I-RNTI1 is the same as its own full-length I-RNTI, the terminal 203 reports the short I-RNTI1 in the response message.

The second base station 202 matches a plurality of short I-RNTIs at the second base station 202 side according to the short I-RNTI reported by the terminal 203, for example, the short I-RNTI1 reported by the terminal 203 is the same as the short I-RNTI1 in the { short I-RNTI1, base station ID 1}, so that the second base station 202 can consider the source base station 1 as a potential true source base station. The second base station 202 may find more than 1 potential source base station by this comparison. The second base station 202 sends a Request for obtaining the Context of the terminal 203 to the plurality of potential source base stations, for example, a signaling Retrieve UE Context Request through an Xn interface. After verifying the request of the second base station 202, the source base station feeds back the Context of the terminal 203 to the second base station 202, for example, signaling Retrieve UE Context Response through Xn interface. Generally, only one source base station should pass the verification of the verification information and feed back the context of the terminal 203 to the second base station 202, which is the first base station 201. After the second base station 202 acquires the context of the terminal 203, it performs subsequent communication with the terminal 203 based on the context.

In the implementation of the step shown in S102, the second base station 202 may send a request to one or more base stations corresponding to the short I-RNTI, where each base station is a base station having one of at least one base station identity corresponding to the short I-RNTI. As can be seen from the foregoing discussion, the one or more base stations to which the short I-RNTI corresponds include the first base station 201 that configures the short I-RNTI for the terminal 203 and stores the context of the terminal 203.

The second base station 202 may carry the short I-RNTI of the terminal in a request sent to one or more base stations corresponding to the short I-RNTI, which indicates at least one context identity for requesting a context corresponding to the at least one context identity from the one or more base stations.

The second base station 202 may also carry authentication information in the request, which is used for the base station receiving the request to perform authentication of the request, such as integrity authentication. In an implementation, the verification information may be transmitted by the terminal 203 to the second base station 202, e.g., the terminal transmits the verification information to the second base station 202 together with the short I-RNTI. It should be appreciated that only the first base station 201 can determine from the authentication information that the request sent by the second base station 202 is authenticated. Thus, the first base station 201 transmits the context of the terminal 203 to the second base station 202 after determining that the request is authenticated.

Specifically, in an implementation manner, if before the step shown in S102 is executed, the second base station 202 determines that the number of base stations corresponding to the short I-RNTI corresponding to the terminal 203 is one, and the second base station 202 may determine a full-length I-RNTI corresponding to the short I-RNTI sent by the terminal 203 according to the first corresponding relationship, at this time, the base station is the first base station 201 configuring the short I-RNTI for the terminal 203, the second base station 202 may send a request carrying the full-length I-RNTI to the first base station 201 in the step shown in S102, where the full-length I-RNTI indicates a first context identifier (i.e., a context identifier of the terminal 203), so that the first base station 201 sends the context with the first context identifier as the context of the terminal to the second base station 202.

In another implementation manner, if the second base station 202 determines that the number of base stations corresponding to the short I-RNTI corresponding to the terminal 203 is not one, for example, before the step shown in S102 is executed, the base station identifier corresponding to the short I-RNTI determined by the second base station 202 is multiple, at this time, one or more base stations are base stations having one base station identifier of the multiple base station identifiers, the second base station 202 may send, to the one or more base stations in the step shown in S102, a request carrying the short I-RNTI and verification information, where the verification information is used for the base station to determine whether the request passes integrity verification, if the request does not pass verification, the base station may discard the request, and if the request passes verification, the base station may send, as the context of the terminal 203, the context having at least one context identifier indicated by the short I-RNTI to the second base station 202. Since it is determined that the request passes integrity verification only after the base station configuring the short I-RNTI for the terminal 203 receives the request carrying the verification information, it is determined that the base station transmitting the request passing integrity verification by the second base station 202 is the first base station 201 configuring the short I-RNTI for the terminal 203, the base station queries at least one context identifier indicated by the short I-RNTI in the request, and if a context corresponding to the at least one context identifier can be queried, the context is the context of the terminal 203, and the base station can transmit the queried context to the second base station 202.

In a possible implementation manner, the request related to the embodiment of the present application may be a request to acquire a UE context (retrieve UE context request).

A communication method provided in the embodiment of the present application is illustrated by taking the wireless communication system 200 shown in fig. 2 as an example, and the method may include the steps shown in fig. 5:

step 501: the second base station 202 receives a first corresponding relationship from the first base station 201, where the first corresponding relationship may include a corresponding relationship between a short I-RNTI and a full length I-RNTI configured for the terminal 203 by the first base station 201, and the short I-RNTI and the full length I-RNTI are configured by the first base station 201 and transmitted to the terminal 203 when the terminal 203 enters an inactive state from a connected state; if the second base station 202 and the first base station 201 are located in the same RNA, the first base station 201 may send the first corresponding relationship to the second base station 202 through the Xn interface;

step 502: the second base station 202 sends a paging message, wherein the paging message carries the full-length I-RNTI of the terminal 203;

step 503: the terminal 203 receives the paging message and sends a short I-RNTI to the second base station 202 after determining that the paging message comprises the full-length I-RNTI configured for the terminal 203 by the first base station 201;

step 504: the second base station 202 determines a full-length I-RNTI corresponding to the short I-RNTI sent by the terminal 203 according to the first corresponding relationship, wherein the full-length I-RNTI corresponding to the short I-RNTI sent by the terminal 203 indicates the base station identifier of the first base station 201, and the full-length I-RNTI also indicates the context identifier of the terminal 203;

step 505: the second base station 202 sends a request to the first base station 201, wherein the request carries the full-length I-RNTI, and the full-length I-RNTI indicates a context identifier to request the first base station 201 to send the context of the terminal 203 to the second base station 202;

step 506: after receiving a request sent by a second base station 201, a first base station 201 sends a context of a terminal 203 to the second base station 202, wherein the context of the terminal 203 has a context identifier indicated by a full-length I-RNTI; in implementation, the first base station 201 may query a context corresponding to a context identifier indicated by the full-length I-RNTI according to the full-length I-RNTI carried in the request sent by the second base station 202, and send the context to the second base station 202 as the context of the terminal 203; after receiving the context of the terminal 203, the first base station 201 may interact with the terminal 203 according to the context of the terminal 203.

Still taking the wireless communication system 200 shown in fig. 2 as an example to illustrate a communication method provided in the embodiment of the present application, the method may include the steps shown in fig. 6:

step 601: the second base station 202 receives a second correspondence relationship from the first base station 201, where the second correspondence relationship may include a correspondence relationship between a short I-RNTI configured by the first base station 201 for the terminal 203 and an interpretation rule, where the interpretation rule may be used to determine at least one base station identifier corresponding to the short I-RNTI, and both the short I-RNTI and the full length I-RNTI are configured by the first base station 201 and sent to the terminal 203 when the terminal 203 enters an inactive state from a connected state; if the second base station 202 and the first base station 201 are located in the same RNA, the first base station 201 may send the second corresponding relationship to the second base station 202 through the Xn interface;

step 602: the second base station 202 sends a paging message, wherein the paging message carries the full-length I-RNTI of the terminal 203;

step 603: the terminal 203 receives the paging message and determines that the paging message comprises a full-length I-RNTI configured for the terminal 203 by the first base station 201, and then sends a short I-RNTI and verification information to the second base station 202, wherein the verification information is generated after the terminal 203 receives input parameters sent by the base station configured with the short I-RNTI and is used for verifying the integrity of the message sent by the terminal 203 to the base station;

step 604: the second base station 202 determines an interpretation rule corresponding to the short I-RNTI sent by the terminal 203 according to the second corresponding relationship;

step 605: the second base station 202 determines at least one base station identifier corresponding to the short I-RNTI sent by the terminal 203 according to an interpretation rule corresponding to the short I-RNTI sent by the terminal 203;

step 606: the second base station 202 sends a request to one or more base stations with base station identities of the at least one base station identity, wherein the request carries the short I-RNTI and the verification information, the short I-RNTI can indicate at least one context identity, the request can be used for requesting a context of the terminal, and the context has part or all of the at least one context identity indicated by the short I-RNTI; the one or more base stations may include the first base station 201, and may also include the first base station 201 and other base stations;

step 607: after receiving the request sent by the second base station 202, the first base station 201 determines whether the request passes integrity verification according to the first verification information, if so, step 608 is executed, otherwise, the request is discarded or not executed;

step 608: the first base station 201 sends a context to the second base station 202, wherein the context has part or all of at least one context identifier indicated by the short I-RNTI, and the context is the context of the terminal 203; in implementation, the first base station 201 may query a context corresponding to at least one context identifier according to the at least one context identifier indicated by the short I-RNTI, and send the queried context to the second base station 202; after receiving the context of the terminal 203, the second base station 202 may interact with the terminal 203 according to the context of the terminal 203.

Still taking the wireless communication system 200 shown in fig. 2 as an example to illustrate a communication method provided in the embodiment of the present application, the method may include the steps shown in fig. 7:

step 701: the second base station 202 receives a third corresponding relationship from the first base station 201, where the third corresponding relationship may include a corresponding relationship between a short I-RNTI configured for the terminal 203 by the first base station 201 and a base station identifier of the first base station 201, and the short I-RNTI and the full length I-RNTI are both configured by the first base station 201 and sent to the terminal 203 when the terminal 203 enters an inactive state from a connected state; if the first base station 201 and the second base station 202 are located in the same RNA, the first base station 201 may send a third corresponding relationship to the second base station 202 through an Xn interface;

step 702: the second base station 202 sends a paging message, wherein the paging message carries the full-length I-RNTI of the terminal 203;

step 703: the terminal 203 receives the paging message and determines that the paging message comprises a full-length I-RNTI configured for the terminal 203 by the first base station 201, and then sends a short I-RNTI and verification information to the second base station 202, wherein the verification information is generated after the terminal 203 receives input parameters sent by the base station configured with the short I-RNTI and is used for verifying the integrity of the message sent by the terminal 203 to the base station;

step 704: the second base station 202 determines at least one base station identifier corresponding to the short I-RNTI sent by the terminal 203 according to the third corresponding relationship;

step 705: the second base station 202 sends a request to one or more base stations with one of the at least one base station identity, wherein the short I-RNTI and the authentication information are carried, the short I-RNTI may indicate at least one context identity, the request may be used to request a context of the terminal 203, the context has some or all of the at least one context identity indicated by the short I-RNTI; the one or more base stations may include the first base station 201, and may also include the first base station 201 and other base stations;

step 706: after receiving the request sent by the second base station 202, the first base station 201 determines whether the request passes integrity verification according to the first verification information, if so, step 707 is executed, otherwise, the request is discarded;

step 707: the first base station 201 sends a context to the second base station 202, wherein the context has part or all of at least one context identifier indicated by the short I-RNTI, and the context is the context of the terminal 203; in implementation, the first base station 201 may query a context corresponding to at least one context identifier according to the at least one context identifier indicated by the short I-RNTI, and send the queried context to the second base station 202; after receiving the context of the terminal 203, the second base station 202 may interact with the terminal 203 according to the context of the terminal 203.

The communication device according to the embodiment of the present application is described in detail below with reference to fig. 8 to 10.

Fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application. The terminal device may be adapted to the system shown in fig. 2, and performs the functions of the terminal 203 in the above-described method embodiment. For convenience of explanation, fig. 8 shows only main components of the terminal device. As shown in fig. 8, the terminal device 40 includes a processor, a memory, a control circuit, an antenna, and an input-output means. The processor is mainly configured to process the communication protocol and the communication data, and control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiments, such as determining that at least one full-length I-RNTI in the paging message includes its own full-length I-RNTI, and the like. The memory is mainly used for storing software programs and data, such as short I-RNTI, full length I-RNTI, etc. described in the above embodiments. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 8 shows only one memory and one processor for ease of illustration. In an actual terminal device, there may be multiple processors and multiple memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this embodiment of the present application.

As an alternative implementation manner, the processor may include a baseband processor and/or a central processing unit, where the baseband processor is mainly used to process the communication protocol and the communication data, and the central processing unit is mainly used to control the whole terminal device, execute a software program, and process data of the software program. The processor in fig. 8 may integrate the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network formats, the terminal device may include a plurality of central processors to enhance its processing capability, and various components of the terminal device may be connected by various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

In the embodiment of the present application, an antenna and a control circuit having a transceiving function may be regarded as the transceiving unit 801 of the terminal device 80, for example, for supporting the terminal device to perform a receiving function and a transmitting function as described in part of fig. 4. The processor having the processing function is regarded as the processing unit 802 of the terminal device 80. As shown in fig. 8, the terminal device 80 includes a transceiving unit 801 and a processing unit 802. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. Alternatively, a device for implementing a receiving function in the transceiver unit 801 may be regarded as a receiving unit, and a device for implementing a sending function in the transceiver unit 801 may be regarded as a sending unit, that is, the transceiver unit 801 includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, and the like, and the sending unit may be referred to as a transmitter, a sending circuit, and the like.

The processor 802 may be configured to execute the instructions stored in the memory, so as to control the transceiver unit 801 to receive and/or transmit signals, thereby implementing the functions of the terminal device in the above-described method embodiments. As an implementation manner, the function of the transceiving unit 801 may be considered to be implemented by a transceiving circuit or a dedicated chip for transceiving.

Fig. 9 is a schematic structural diagram of a network device provided in an embodiment of the present application, for example, a schematic structural diagram of a base station. As shown in fig. 9, the base station can be applied to the system shown in fig. 2, and performs the functions of the first base station 201 and the second base station 202 in the above method embodiment. The base station 90 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 901 and one or more baseband units (BBUs) (which may also be referred to as digital units, DUs) 902. The RRU 901 may be referred to as a transceiver unit, a transceiver circuit, or a transceiver, and may include at least one antenna 9011 and a radio frequency unit 9012. The RRU 901 is mainly used for transceiving radio frequency signals and converting radio frequency signals to baseband signals, for example, for receiving a short I-RNTI from a terminal, sending a request to one or more base stations corresponding to the short I-RNTI, and receiving a context of the terminal from a first base station. The BBU 902 part is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 901 and the BBU 902 may be physically disposed together, or may be physically disposed separately, that is, a distributed base station.

The BBU 902 is a control center of a base station, and may also be referred to as a processing unit, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) 902 can be used to control the base station to execute the operation flow related to the base station in the above method embodiment.

In an example, the BBU 902 may be formed by one or more boards, and the boards may jointly support a radio access network (e.g., an LTE network) with a single access indication, or may respectively support radio access networks (e.g., LTE networks, 5G networks, or other networks) with different access schemes. The BBU 902 further includes a memory 9021 and a processor 9022, where the memory 9021 is configured to store necessary instructions and data. For example, the memory 9021 stores the correspondence, table, and the like referred to in the above-described embodiments. The processor 9022 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the step of determining one or more base stations corresponding to the short I-RNTI in the above method embodiment. The memory 9021 and the processor 9022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits

Fig. 10 shows a schematic structural diagram of a communication apparatus 1000. The apparatus 1000 may be used to implement the methods described in the above method embodiments, and reference may be made to the description of the above method embodiments. The communication apparatus 1000 may be a chip, a network device (e.g., a base station), a terminal device or other network devices.

The communication device 1000 includes one or more processors 1001. The processor 1001 may be a general-purpose processor or a special-purpose processor, etc. For example, a baseband processor, or a central processor. The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control a communication device (e.g., a base station, a terminal, or a chip), execute a software program, and process data of the software program. The communication device may include a transceiving unit to enable input (reception) and output (transmission) of signals. For example, the communication device may be a chip, and the transceiving unit may be an input and/or output circuit of the chip, or a communication interface. The chip can be used for a terminal or a base station or other network equipment. As another example, the communication device may be a terminal or a base station or other network equipment, and the transceiver unit may be a transceiver, a radio frequency chip, or the like.

The communication device 1000 includes one or more processors 1001, and the one or more processors 1001 may implement the method of the terminal 203, the first base station 201, or the second base station 202 in the embodiment shown in fig. 5.

In one possible design, the communications apparatus 1000 includes means (means) for generating a request to transmit to one or more base stations corresponding to a short I-RNTI and means (means) for transmitting the request. The functions of means for generating a request to transmit to one or more base stations corresponding to the short I-RNTI may be implemented by one or more processors, memory. The request may be generated, for example, by one or more processors, sent through a transceiver, or an interface of an input/output circuit, or chip. The request may be referred to the relevant description in the above method embodiment.

In one possible design, the communications apparatus 1000 may include means (means) for receiving a short I-RNTI and means (means) for sending a request to one or more base stations to which the short I-RNTI corresponds based on the short I-RNTI. The short I-RNTI and how to send a request based on the short I-RNTI may be seen in the relevant description of the above method embodiments. The short I-RNTI may be received, for example, by a transceiver, or an input/output circuit, or an interface of a chip, from which the request is sent by one or more processors.

Alternatively, the processor 1001 may also implement other functions than the method of the embodiment shown in fig. 5.

Alternatively, in one design, the processor 1001 may execute instructions to enable the communication device 1000 to perform the method described in the above method embodiment. The instructions may be stored in whole or in part in the processor, such as instructions 1003, or in whole or in part in a memory 1002 coupled to the processor, such as instructions 1004, or may collectively cause the communication apparatus 1000 to perform the method described in the above method embodiment, through

instructions

1003 and 1004.

In yet another possible design, the communication apparatus 1000 may also include a circuit, and the circuit may implement the functions of the network device or the terminal device in the foregoing method embodiments.

In yet another possible design, the communication device 1000 may include one or more memories 1002 having instructions 1004 stored thereon, which are executable on the processor, so that the communication device 1000 performs the methods described in the above method embodiments. Optionally, the memory may further store data therein. Instructions and/or data may also be stored in the optional processor. For example, the one or more memories 1002 may store the corresponding relationships described in the above embodiments, or related parameters or tables and the like involved in the above embodiments. The processor and the memory may be provided separately or may be integrated together.

In yet another possible design, the communications device 1000 may also include a transceiver unit 1005 and an antenna 1006. The processor 1001 may be referred to as a processing unit and controls a communication apparatus (terminal or base station). The transceiving unit 1005 may be referred to as a transceiver, transceiving circuit, transceiver, or the like, and is used for implementing transceiving function of the communication device through the antenna 1006.

The present application also provides a communication system comprising one or more of the aforementioned network devices, and one or more of the terminal devices.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The present application further provides a computer-readable medium, on which a computer program is stored, where the computer program is executed by a computer to implement the communication method in any of the above method embodiments.

The embodiment of the present application further provides a computer program product, and when executed by a computer, the computer program product implements the communication method described in any of the above method embodiments.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to execute the communication method according to any one of the above method embodiments.

It should be understood that the processing device may be a chip, the processor may be implemented by hardware or software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated in the processor, located external to the processor, or stand-alone.

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 application. 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. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned 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 application.

Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the word "/" herein generally indicates that the pre-and post-associated objects are in an "or" relationship, but in some cases may also indicate "and/or", as may be determined by the particular context.

It should be understood that in the embodiment of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

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 place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented in hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, the method is simple. Any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a Digital Subscriber Line (DSL), or a wireless technology such as infrared, radio, and microwave, the coaxial cable, the fiber optic cable, the twisted pair, the DSL, or the wireless technology such as infrared, radio, and microwave are included in the fixation of the medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy Disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

In short, the above description is only a preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of communication, comprising:

receiving a first inactive radio network temporary identifier I-RNTI from a terminal, wherein the bit number of the first I-RNTI is less than that of a second I-RNTI, and the second I-RNTI indicates a base station identifier;

sending a request to one or more base stations corresponding to the first I-RNTI, wherein the request is used for requesting the context of the terminal;

receiving a context of the terminal from a first base station, the first base station being one of the one or more base stations.

2. The method of claim 1, further comprising:

and determining one or more base stations corresponding to the first I-RNTI.

3. The method of claim 2, wherein the determining one or more base stations corresponding to the first I-RNTI comprises:

and determining one or more base stations corresponding to the first I-RNTI according to the second I-RNTI corresponding to the first I-RNTI.

4. The method of claim 3, further comprising:

receiving a first corresponding relation from at least one base station, wherein the first corresponding relation indicates a second I-RNTI corresponding to the first I-RNTI, and one or more base stations corresponding to the first I-RNTI are all or part of the at least one base station.

5. A method according to claim 3 or 4, wherein the second I-RNTI also indicates a context identity, wherein the request comprises the second I-RNTI and wherein the context of the terminal has the context identity indicated by the second I-RNTI.

6. The method of claim 2, wherein the determining one or more base stations corresponding to the first I-RNTI comprises:

and determining one or more base stations corresponding to the first I-RNTI according to the interpretation rule corresponding to the first I-RNTI.

7. The method of any of claim 6, further comprising:

and receiving a second corresponding relation from at least one base station, wherein the second corresponding relation indicates the interpretation rule corresponding to the first I-RNTI, and one or more base stations corresponding to the first I-RNTI are all or part of the at least one base station.

8. The method of claim 2, wherein the determining one or more base stations corresponding to the first I-RNTI comprises:

and determining one or more base stations corresponding to the first I-RNTI according to a third corresponding relation from at least one base station, wherein the third corresponding relation indicates one or more base stations corresponding to the first I-RNTI, and the one or more base stations corresponding to the first I-RNTI are all or part of the at least one base station.

9. The method according to any of claims 6 to 8, wherein the request comprises the first I-RNTI indicating at least one context identity, wherein the context from the first base station has a first context identity, and wherein the first context identity is one of the at least one context identity.

10. The method according to any of claims 1 to 9, wherein the request comprises authentication information, the authentication information being used for authentication of the request.

11. The method of claim 10, wherein the first base station has a correspondence with the authentication information.

12. The method of any one of claims 1 to 11, further comprising:

and sending a paging message to the terminal, wherein the paging message indicates one or more second I-RNTIs, and the received first I-RNTI corresponds to one of the one or more second I-RNTIs.

13. The method of claim 12, wherein the one or more base stations corresponding to the first I-RNTI are a subset of the one or more base stations indicated by the second I-RNTI indicated by the paging message.

14. A method of communication, comprising:

responding to a first message from a first base station, and entering an inactive state from a connected state, wherein the first message comprises at least one of a first inactive state radio network temporary identifier I-RNTI or a second I-RNTI configured by the first base station for the terminal, the bit number of the first I-RNTI is less than that of the second I-RNTI, and the first I-RNTI and the second I-RNTI have a corresponding relation;

and responding to a second message from a second base station, and sending the first I-RNTI to the second base station, wherein the first I-RNTI is used for the terminal to request to be restored to a connection state.

15. The method of claim 14, wherein the second I-RNTI indicates at least one of an identity of the first base station or a context identity of the terminal.

16. The method according to claim 14 or 15, wherein the second message comprises one or more second I-RNTIs, and wherein the one or more second I-RNTIs comprise the second I-RNTI in the first message.

17. A communication device configured to perform the method of any one of claims 1-16.

18. A communications apparatus, comprising: a processor coupled with a memory;

a memory for storing computer programs or instructions;

a processor for executing a computer program or instructions stored in the memory to cause the apparatus to perform the method of any of claims 1-16.

19. A readable storage medium, comprising a program or instructions for performing the method of any one of claims 1-16 when the program or instructions are run on a computer.