CN109819490A

CN109819490A - The method, apparatus and system of handover between cells

Info

Publication number: CN109819490A
Application number: CN201910127585.6A
Authority: CN
Inventors: 王晓娜; 唐小勇; 李铕
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-10-30
Filing date: 2014-10-30
Publication date: 2019-05-28
Anticipated expiration: 2034-10-30
Also published as: CN109819490B; WO2016065580A1; CN107079367A; CN107079367B

Abstract

The present invention provides the method, apparatus and system of a kind of handover between cells.A kind of method of handover between cells, comprising: target BS receives the switching request message that source base station is sent, and the handoff request message includes the status information of to be switched user equipment；The source base station is the serving BS of source cell, and the target BS is the serving BS of Target cell；The target BS is according to the status information of the to be switched user equipment, it determines the collaboration user equipment for assisting the to be switched user equipment to switch over, and determines the TA of the to be switched user equipment according to the Timing Advance TA of the collaboration user equipment；The target BS sends switching response message to the source base station, and the switching response message includes the TA of the to be switched user equipment.It solves in the prior art when carrying out handover between cells, there are problems that space interface signaling expense is larger and switching delay.

Description

Method, device and system for switching among cells

Technical Field

The present invention relates to communications technologies, and in particular, to a method, an apparatus, and a system for switching between cells.

Background

In a communication system, when user equipment moves from the coverage area of one cell to the coverage area of another cell, an inter-cell handover is required.

In the prior art, a signaling flow for switching a user equipment between a source cell and a target cell is as follows: 1) a source base station sends a switching request message to a target base station; 2) the target base station returns a switching response message to the source base station; 3) if the target cell allows the user equipment to switch, the switching response message comprises a switching instruction from the user equipment to the target cell, and the source base station forwards the switching instruction to the user equipment; 4) the user equipment sends a random access request message to a target base station according to the received switching indication; 5) the target base station returns a random access response message to the user equipment, wherein the random access response message comprises a Time Advance (TA, Time Advance); the TA is estimated and obtained by a target base station according to a random access request message sent by user equipment; 6) and the user equipment communicates with the target base station according to the TA.

However, in the prior art, when performing inter-cell handover, there are problems of large overhead of air interface signaling and handover delay.

Disclosure of Invention

The invention provides a method, a device and a system for switching among cells, which are used for solving the problems of high air interface signaling overhead and switching delay in the prior art when switching among cells.

In a first aspect, the present invention provides a method for inter-cell handover, including:

a target base station receives a switching request message sent by a source base station, wherein the switching request message comprises state information of user equipment to be switched; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell;

the target base station determines cooperative user equipment for assisting the user equipment to be switched to switch according to the state information of the user equipment to be switched, and determines the TA of the user equipment to be switched according to the TA of the cooperative user equipment;

and the target base station sends a switching response message to the source base station, wherein the switching response message comprises the TA of the user equipment to be switched.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the target base station, the TA of the to-be-switched user equipment according to the TA of the cooperative user equipment includes: the target base station determines that the TA of the user equipment to be switched is equal to the TA of the cooperative user equipment; or, the target base station determines that the TA of the to-be-switched user equipment is equal to the sum of the TA of the cooperative user equipment and the offset value; wherein the offset value is determined according to a distance between the cooperative user equipment and the user equipment to be switched.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the state information is mobile information of the user equipment to be switched; the movement information includes: the current position information of the user equipment to be switched;

correspondingly, the determining, by the target base station, the cooperative user equipment for assisting the user equipment to be switched to perform switching according to the state information of the user equipment to be switched includes:

and the target base station determines the user equipment with the distance to the user equipment to be switched being less than a preset threshold as the cooperative user equipment of the user equipment to be switched according to the current position information of the user equipment to be switched.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the movement information further includes location correction information, and the location correction information includes at least one of the following information:

the moving speed, moving direction and position precision of the user equipment to be switched;

correspondingly, the step of determining, by the target base station, according to the current location information of the user equipment to be switched, the user equipment whose distance from the target base station to the user equipment to be switched is smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched includes:

and the target base station acquires the position information of the user equipment to be switched after correction according to the current position information of the user equipment to be switched and the position correction information, and determines the user equipment with the distance between the user equipment to be switched and the user equipment to be switched smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched according to the position information of the user equipment to be switched after correction.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the state information is Device-to-Device (D2D) information of the user equipment to be switched; the D2D information includes: the D2D identifier of the user equipment to be switched and first resource configuration information, wherein the first resource configuration information is used for indicating communication resources occupied by the D2D signal of the user equipment to be switched;

the target base station sends a D2D measurement indication message to the serving user equipment in the target cell; the D2D measurement indication message includes: D2D identification and first resource configuration information of the user equipment to be switched;

the target base station receives a D2D measurement response message sent by the service user equipment; the D2D measurement response message includes D2D signal quality information; the D2D signal quality information is D2D signal quality information between the serving user equipment and the user equipment to be handed over, which is measured by the serving user equipment according to the D2D identifier of the user equipment to be handed over and the first resource configuration information;

and the target base station determines that the service user equipment with the best D2D signal quality is the cooperative user equipment of the user equipment to be switched.

With reference to the first aspect and any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the handover response message further includes: the cell wireless network of the user equipment to be switched in the target cell temporarily identifies the CRNTI and the second resource configuration information; and the second resource configuration information is used for indicating the initial uplink Grant resource UL-Grant allocated to the user equipment to be switched by the target base station.

In a second aspect, the present invention further provides a method for inter-cell handover, including:

a source base station sends a switching request message to a target base station, wherein the switching request message comprises the state information of the user equipment to be switched; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell to which the user equipment to be switched needs to be accessed;

the source base station receives a handover response message sent by the target base station, wherein the handover response message comprises: the TA of the UE to be switched; the TA of the user equipment to be switched is determined by the target base station according to the state information of the user equipment to be switched, and is determined according to the TA of the cooperative user equipment;

and the source base station sends a switching indication message to the user equipment to be switched, wherein the switching indication message comprises the TA of the user equipment to be switched.

With reference to the second aspect, in a first possible implementation manner of the second aspect, before the sending, by the source base station, a handover request message to the target base station, the method further includes:

the source base station determines the state information of the user equipment to be switched;

wherein the status information includes: movement information of the user equipment to be switched or device-to-device D2D information.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the determining, by the source base station, the status information of the user equipment to be handed off includes:

the source base station determines whether the mobile information of the user equipment to be switched can be obtained or not;

if so, the source base station acquires the mobile information of the user equipment to be switched;

otherwise, the source base station allocates D2D information to the user equipment to be switched.

With reference to any one of the first to the second possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect, the moving information includes: the current position information of the user equipment to be switched;

the D2D information, comprising: the D2D identifier of the user equipment to be switched and first resource configuration information, where the first resource configuration information is used to indicate communication resources occupied by the D2D signal of the user equipment to be switched.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the movement information further includes location correction information, and the location correction information includes at least one of the following information:

and the moving speed, the moving direction and the position precision of the user equipment to be switched.

With reference to the second aspect and any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the handover response message further includes: the cell wireless network of the user equipment to be switched in the target cell temporarily identifies the CRNTI and the second resource configuration information; the second resource configuration information is used for indicating the initial uplink Grant resource UL-Grant allocated to the user equipment to be switched by the target base station;

correspondingly, the handover indication message further includes: the CRNTI and the second resource configuration information.

In a third aspect, the present invention provides a target base station, where the target base station is a serving base station of a target cell, and the target base station includes:

a receiving module, configured to receive a handover request message sent by a source base station, where the handover request message includes state information of a user equipment to be handed over; the source base station is a service base station of a source cell;

a determining module, configured to determine, according to the state information of the to-be-switched user equipment, a cooperative user equipment for assisting the to-be-switched user equipment to perform switching, and determine, according to a TA of the cooperative user equipment, a TA of the to-be-switched user equipment;

a sending module, configured to send a handover response message to the source base station, where the handover response message includes the TA of the ue to be handed over.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the determining module is specifically configured to: determining that the TA of the user equipment to be switched is equal to the TA of the cooperative user equipment; or, determining that the TA of the user equipment to be switched is equal to the sum of the TA of the cooperative user equipment and the offset value; wherein the offset value is determined according to a distance between the cooperative user equipment and the user equipment to be switched.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the state information is the movement information of the user equipment to be switched; the movement information includes: the current position information of the user equipment to be switched;

correspondingly, the determining module is specifically configured to: and determining the user equipment with the distance to the user equipment to be switched being smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched according to the current position information of the user equipment to be switched.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the movement information further includes location correction information, and the location correction information includes at least one of the following information:

correspondingly, the determining module is specifically configured to: and according to the current position information of the user equipment to be switched and the position correction information, obtaining the corrected position information of the user equipment to be switched, and according to the corrected position information of the user equipment to be switched, determining the user equipment with the distance between the user equipment to be switched and the user equipment to be switched smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched.

With reference to the third aspect, in a fourth possible implementation manner of the third aspect, the state information is device-to-device D2D information of the user equipment to be switched; the D2D information includes: the D2D identifier of the user equipment to be switched and first resource configuration information, wherein the first resource configuration information is used for indicating communication resources occupied by the D2D signal of the user equipment to be switched;

correspondingly, the determining module is specifically configured to:

sending a D2D measurement indication message to a serving user equipment within the target cell; the D2D measurement indication message includes: D2D identification and first resource configuration information of the user equipment to be switched;

receiving a D2D measurement response message sent by the serving user equipment; the D2D measurement response message includes D2D signal quality information; the D2D signal quality information is D2D signal quality information between the serving user equipment and the user equipment to be handed over, which is measured by the serving user equipment according to the D2D identifier of the user equipment to be handed over and the first resource configuration information;

and determining that the service user equipment with the best D2D signal quality is the cooperative user equipment of the user equipment to be switched.

With reference to the third aspect and any one of the first to fourth possible implementation manners of the third aspect, in a fifth possible implementation manner of the third aspect, the handover response message further includes: the cell wireless network of the user equipment to be switched in the target cell temporarily identifies the CRNTI and the second resource configuration information; and the second resource configuration information is used for indicating the initial uplink Grant resource UL-Grant allocated to the user equipment to be switched by the target base station.

In a fourth aspect, the present invention provides a source base station, where the source base station is a serving base station of a source cell, and the source base station includes:

a handover request sending module, configured to send a handover request message to a target base station, where the handover request message includes state information of the to-be-handed over user equipment; the target base station is a service base station of a target cell to which the user equipment to be switched needs to be accessed;

a receiving module, configured to receive a handover response message sent by the target base station, where the handover response message includes: the TA of the UE to be switched; the TA of the user equipment to be switched is determined by the target base station according to the state information of the user equipment to be switched, and is determined according to the TA of the cooperative user equipment;

a switching indication sending module, configured to send a switching indication message to the to-be-switched user equipment, where the switching indication message includes a TA of the to-be-switched user equipment.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the method further includes:

the determining module is used for determining the state information of the user equipment to be switched; wherein the status information includes: movement information of the user equipment to be switched or device-to-device D2D information.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the determining module is specifically configured to:

determining whether the mobile information of the user equipment to be switched can be obtained;

if so, acquiring the mobile information of the user equipment to be switched;

otherwise, distributing D2D information for the user equipment to be switched.

With reference to any one of the first to the second possible implementation manners of the fourth aspect, in a third possible implementation manner of the fourth aspect, the movement information includes: the current position information of the user equipment to be switched;

With reference to the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the movement information further includes location correction information, and the location correction information includes at least one of the following information:

With reference to the fourth aspect and any one of the first to fourth possible implementation manners of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the handover response message further includes: the cell wireless network of the user equipment to be switched in the target cell temporarily identifies the CRNTI and the second resource configuration information; the second resource configuration information is used for indicating the initial uplink Grant resource UL-Grant allocated to the user equipment to be switched by the target base station;

The invention provides a system for switching among cells, which comprises: the base station in the third aspect, any one of the first to fifth possible implementation manners of the third aspect, and the base station in the fourth aspect, any one of the first to fifth possible implementation manners of the fourth aspect.

The invention provides a method, a device and a system for switching among cells, which are characterized in that a target base station determines cooperative user equipment for assisting the user equipment to be switched to switch according to state information of the user equipment to be switched sent by a source base station, determines TA of the user equipment to be switched according to the TA of the cooperative user equipment, and sends a switching response message comprising the TA of the user equipment to be switched to the source base station, so that the source base station sends the TA of the user equipment to be switched to the user equipment to be switched through a switching indication message, thereby avoiding the random access process of the user equipment to be switched in the switching process, reducing air interface signaling overhead and reducing switching delay.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of an application scenario of the inter-cell handover method of the present invention;

FIG. 2 is a flowchart of a first embodiment of a method for inter-cell handover according to the present invention;

FIG. 3 is a flowchart of a second embodiment of a method for inter-cell handover;

FIG. 4 is a flowchart of a third method for inter-cell handover according to the present invention;

FIG. 5 is a flowchart of a fourth method for intercell handover according to the present invention;

FIG. 6 is a flowchart of a fifth embodiment of a method for inter-cell handover according to the present invention;

FIG. 7 is a flowchart of a sixth embodiment of a method for inter-cell handover according to the present invention;

FIG. 8 is a flowchart of a seventh embodiment of a method for intercell handover according to the present invention;

fig. 9 is a schematic structural diagram of a base station according to a first embodiment of the present invention;

fig. 10 is a schematic structural diagram of a base station according to a fourth embodiment of the present invention;

fig. 11 is a schematic structural diagram of a base station according to a fifth embodiment of the present invention;

fig. 12 is a schematic structural diagram of a base station according to a sixth embodiment of the present invention;

fig. 13 is a schematic structural diagram of a base station according to a ninth embodiment of the present invention;

fig. 14 is a schematic structural diagram of a base station in accordance with a tenth embodiment of the present invention.

Detailed Description

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

FIG. 1 is a schematic diagram of an application scenario of the inter-cell handover method of the present invention; as shown in fig. 1, in the wireless communication network, the user equipment 13 is camped on the source cell 11, and when the user equipment 13 moves from the position L1 to the position L2 in the direction indicated by the dotted arrow in fig. 1, the user equipment 13 needs to perform an inter-cell handover from the source cell 11 to the target cell 12. In the prior art, after receiving a handover indication message sent by a serving base station of a source cell 11, a user equipment 13 needs to send a random access request message to a serving base station of a target cell 12, so that the serving base station of the target cell 12 can estimate a TA of the user equipment 13 according to the random access request message, and send the TA to the user equipment 13 through a random access response message; therefore, when performing inter-cell handover, the problems of high overhead of air interface signaling and handover delay exist.

It should be noted that the serving base stations of the source cell and the target cell of the present invention may be the same or different; that is, the source base station and the target base station in the present invention may be the same base station or different base stations.

Fig. 2 is a flowchart of a first method for inter-cell handover according to an embodiment of the present invention, and as shown in fig. 2, the method of this embodiment may include:

step 201, a target base station receives a handover request message sent by a source base station, wherein the handover request message includes state information of user equipment to be handed over; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell;

step 202, the target base station determines a cooperative user equipment for assisting the user equipment to be switched to perform switching according to the state information of the user equipment to be switched, and determines a TA of the user equipment to be switched according to the TA of the cooperative user equipment;

step 203, the target base station sends a handover response message to the source base station, where the handover response message includes the TA of the user equipment to be handed over.

In the prior art, in the switching process of the user equipment to be switched, the target base station estimates the TA of the user equipment to be switched according to the random access request message sent by the user equipment to be switched, and sends the TA to the user equipment to be switched through the random access response message. In the invention, a target base station determines cooperative user equipment for assisting the user equipment to be switched to switch according to state information of the user equipment to be switched, which is sent by a source base station, determines TA of the user equipment to be switched according to TA of the cooperative user equipment, and sends a switching response message including the TA of the user equipment to be switched to the source base station, so that the source base station sends the TA of the user equipment to be switched to the user equipment to be switched through a switching indication message.

In the prior art, a target base station needs to estimate a TA of a user equipment to be switched according to a random access request message sent by the user equipment to be switched, and sends the TA to the user equipment to be switched through a random access response message; after the target base station returns a random access response message (namely, a random access process) including a TA of the user equipment to be switched to the user equipment to be switched, the user equipment to be switched can obtain a TA value which is used when the user equipment to be switched communicates with the target base station; therefore, the problems of high air interface signaling overhead and switching delay exist. According to the invention, the target base station determines the cooperative user equipment for assisting the user equipment to be switched to switch according to the state information of the user equipment to be switched sent by the source base station, determines the TA of the user equipment to be switched according to the TA of the cooperative user equipment, and sends the switching response message including the TA of the user equipment to be switched to the source base station, so that the source base station sends the TA of the user equipment to be switched to through the switching indication message, thereby avoiding the random access process of the user equipment to be switched in the switching process, reducing the air interface signaling overhead and reducing the switching delay.

In this embodiment, the target base station determines, according to the state information of the to-be-switched user equipment sent by the source base station, the cooperative user equipment for assisting the to-be-switched user equipment to perform switching, determines, according to the TA of the cooperative user equipment, the TA of the to-be-switched user equipment, and sends, to the source base station, a switching response message including the TA of the to-be-switched user equipment, so that the source base station sends the TA of the to-be-switched user equipment to the to-be-switched user equipment through the switching indication message, thereby avoiding a random access process of the to-be-switched user equipment in the switching process, and reducing an air interface signaling overhead and reducing a switching delay.

Fig. 3 is a flowchart of a second method for switching between cells according to the present invention, and as shown in fig. 3, the method of this embodiment may include:

301, a target base station receives a handover request message sent by a source base station, wherein the handover request message includes mobile information of a user equipment to be handed over; the movement information includes: the current position information of the user equipment to be switched; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell;

step 302, the target base station determines, according to the movement information of the user equipment to be switched, the user equipment of which the distance to the user equipment to be switched is less than a preset threshold as the cooperative user equipment of the user equipment to be switched;

optionally, the target base station may obtain the current location information of the serving user equipment by sending a location information request to the serving user equipment in the target cell; and the target base station determines the user equipment with the distance to the user equipment to be switched smaller than a preset threshold according to the current position information of the service user equipment and the current position information of the user equipment to be switched.

The serving ue may be all serving ues in a target cell, or may also be a serving ue in the target cell and in the same direction as the ue to be switched.

Optionally, the current location information of the to-be-switched user equipment and the current location information of the service user equipment may be represented by longitude and latitude, and the distance between the to-be-switched user equipment and the service user equipment may be calculated by longitude and latitude.

Optionally, the target base station may send a location information request to the serving user equipment; the service user equipment receives the position information request, obtains the current longitude and latitude information of the service user equipment through a Global Positioning System (GPS), and sends the current longitude and latitude information of the service user equipment to a target base station through a position information response message.

Optionally, the target base station may also estimate a relative position between the serving user equipment and the target base station; for example, the target base station is used as a reference point, and the included angle, distance or coordinate between the serving ue and the target base station is used as a reference point.

Optionally, the movement information may further include location correction information, where the location correction information includes at least one of the following information:

further optionally, the target base station may obtain the corrected position information of the user equipment to be switched according to the current position information of the user equipment to be switched and the position correction information, and determine, according to the corrected position information of the user equipment to be switched, that the user equipment whose distance from the user equipment to be switched is smaller than a preset threshold is the cooperative user equipment of the user equipment to be switched.

Optionally, when the target base station determines that a plurality of user equipments whose distances to the user equipment to be switched are smaller than a preset threshold are present: the user equipment with the minimum distance to the user equipment to be switched in the plurality of user equipments can be used as the cooperative user equipment of the user equipment to be switched.

Step 303, the target base station determines the TA of the ue to be switched according to the TA of the cooperative ue;

specifically, the target base station obtains the TA of the cooperative user equipment through measurement, and then determines the TA of the user equipment to be switched according to the TA of the cooperative user equipment.

Optionally, the determining, by the target base station, the TA of the to-be-switched user equipment according to the TA of the cooperative user equipment includes:

the target base station determines that the TA of the user equipment to be switched is equal to the TA of the cooperative user equipment; or,

the target base station determines that the TA of the user equipment to be switched is equal to the sum of the TA of the cooperative user equipment and the offset value; wherein the offset value is determined according to a distance between the cooperative user equipment and the user equipment to be switched.

Optionally, determining the offset value according to the distance between the cooperative user equipment and the user equipment to be switched may be: the offset value is equal to the distance between the cooperative user equipment and the user to be switched divided by the transmission speed of the electromagnetic wave in the air (3 x 10^8 m/s).

Step 304, the target base station sends a handover response message to the source base station, where the handover response message includes the TA of the user equipment to be handed over.

Optionally, the handover response message may further include: cell Radio Network Temporary identity (CRNTI, Cell Radio Network Temporary identity) and second resource configuration information of the user equipment to be switched in the target Cell; wherein the second resource configuration information is used to indicate the initial uplink Grant resource (UL-Grant) allocated to the user equipment to be switched by the target base station. By carrying the CRNTI and the second resource configuration information of the user equipment to be switched in the target cell in the switching response message, the source base station can send the CRNTI and the second resource configuration information to the user equipment to be switched through the switching indication message after receiving the switching response message; after receiving the switching indication message, the user equipment to be switched can obtain the CRNTI and the second resource configuration information of the user equipment in the target cell, and can communicate with the target base station according to the CRNTI and the second resource configuration information, thereby further reducing the switching delay.

In this embodiment, the target base station determines, according to the movement information of the to-be-switched user equipment sent by the source base station, that the user equipment whose distance from the to-be-switched user equipment is smaller than the preset threshold is the cooperative user equipment of the to-be-switched user equipment, determines, according to the TA of the cooperative user equipment, the TA of the to-be-switched user equipment, and sends a switching response message including the TA of the to-be-switched user equipment to the source base station, so that the source base station sends the TA of the to-be-switched user equipment to the to-be-switched user equipment through the switching indication message, thereby avoiding a random access process of the to-be-switched user equipment in the switching process, and reducing air interface signaling overhead and switching delay.

Fig. 4 is a flowchart of a third method for inter-cell handover according to the present invention, and as shown in fig. 4, the method of this embodiment may include:

step 401, a target base station receives a handover request message sent by a source base station, wherein the handover request message includes D2D information of a user equipment to be handed over; the D2D information includes: the D2D identifier of the user equipment to be switched and first resource configuration information, wherein the first resource configuration information is used for indicating communication resources occupied by the D2D signal of the user equipment to be switched; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell;

step 402, the target base station sends a D2D measurement indication message to a serving user equipment in the target cell; the D2D measurement indication message includes: D2D identification and first resource configuration information of the user equipment to be switched;

Optionally, the D2D measurement indication message may further include: measurement time, measurement result reporting format, and the like.

Step 403, the target base station receives a D2D measurement response message sent by the serving user equipment; the D2D measurement response message includes D2D signal quality information; the D2D signal quality information is D2D signal quality information between the serving user equipment and the user equipment to be handed over, which is measured by the serving user equipment according to the D2D identifier of the user equipment to be handed over and the first resource configuration information;

step 404, the target base station determines that the serving user equipment with the best D2D signal quality is the cooperative user equipment of the user equipment to be switched;

step 405, the target base station determines the TA of the user equipment to be switched according to the TA of the cooperative user equipment;

Optionally, the target base station may determine that the TA of the to-be-switched user equipment is equal to the TA of the cooperative user equipment.

Step 406, the target base station sends a handover response message to the source base station, where the handover response message includes the TA of the ue to be handed over.

Optionally, the handover response message may further include: CRNTI and second resource configuration information of the user equipment to be switched in the target cell; wherein the second resource configuration information is used to indicate the initial uplink Grant resource (UL-Grant) allocated to the user equipment to be switched by the target base station. By carrying the CRNTI and the second resource configuration information of the user equipment to be switched in the target cell in the switching response message, the source base station can send the CRNTI and the second resource configuration information to the user equipment to be switched through the switching indication message after receiving the switching response message; after receiving the switching indication message, the user equipment to be switched can obtain the CRNTI and the second resource configuration information of the user equipment in the target cell, and can communicate with the target base station according to the CRNTI and the second resource configuration information, thereby further reducing the switching delay.

In this embodiment, the target base station determines, according to the D2D information of the to-be-switched user equipment sent by the source base station, that the serving user equipment with the best D2D signal quality with the to-be-switched user equipment is the cooperative user equipment of the to-be-switched user equipment, determines, according to the TA of the cooperative user equipment, the TA of the to-be-switched user equipment, and sends a handover response message including the TA of the to-be-switched user equipment to the source base station, so that the source base station sends the TA of the to-be-switched user equipment to the to-be-switched user equipment through the handover indication message, thereby avoiding a random access process of the to-be-switched user equipment in a handover process, and reducing air interface signaling overhead and handover delay.

Fig. 5 is a flowchart of a fourth method for inter-cell handover according to the present invention, as shown in fig. 5, the method of this embodiment may include:

step 501, a source base station sends a switching request message to a target base station, wherein the switching request message comprises the state information of the user equipment to be switched; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell to which the user equipment to be switched needs to be accessed;

step 502, the source base station receives a handover response message sent by the target base station, where the handover response message includes: the TA of the UE to be switched; the TA of the user equipment to be switched is determined by the target base station according to the state information of the user equipment to be switched, and is determined according to the TA of the cooperative user equipment;

step 503, the source base station sends a handover indication message to the ue to be handed over, where the handover indication message includes a TA of the ue to be handed over.

In the prior art, after receiving a handover response message including a handover indication sent by a target base station, a source base station sends a handover indication message to a user equipment to be handed over, so that the user equipment to be handed over can send a random access request message to the target base station according to the received handover indication, the target base station estimates and obtains a TA of the user equipment to be handed over according to the random access request message, and the target base station sends the TA to the user equipment to be handed over through the random access response message. In the invention, a source base station sends a switching request message including the state information of the user equipment to be switched to a target base station, so that the target base station determines cooperative user equipment for assisting the user equipment to be switched to switch according to the state information of the user equipment to be switched, and determines the TA of the user equipment to be switched according to the TA of the cooperative user equipment; and the source base station receives a switching response message which is sent by the target base station and comprises the TA of the user equipment to be switched, and sends the TA of the user equipment to be switched to the user equipment to be switched through the switching indication message.

In the prior art, after receiving a handover response message including a handover indication sent by a target base station, a source base station sends a handover indication message to a user equipment to be handed over, so that the user equipment to be handed over can send a random access request message to the target base station according to the received handover indication, the target base station estimates and obtains a TA of the user equipment to be handed over according to the random access request message, and the target base station sends the TA to the user equipment to be handed over through the random access response message; after the target base station returns a random access response message (namely, a random access process) including a TA of the user equipment to be switched to the user equipment to be switched, the user equipment to be switched can obtain a TA value which is used when the user equipment to be switched communicates with the target base station; therefore, the problems of high air interface signaling overhead and switching delay exist. In the invention, a source base station sends a switching request message including the state information of the user equipment to be switched to a target base station, so that the target base station determines the cooperative user equipment for assisting the user equipment to be switched to switch according to the state information of the user equipment to be switched, and determines the TA of the user equipment to be switched according to the TA of the cooperative user equipment; the source base station receives a switching response message which is sent by the target base station and comprises the TA of the user equipment to be switched, and sends the TA of the user equipment to be switched to the user equipment to be switched through a switching indication message; the random access process of the user equipment to be switched in the switching process is avoided, so that the air interface signaling overhead is reduced, and the switching delay is reduced.

Fig. 6 is a flowchart of a fifth embodiment of a method for inter-cell handover according to the present invention, as shown in fig. 6, the method of this embodiment may include:

601, a source base station determines that user equipment is to-be-switched user equipment and a target cell to which the to-be-switched user equipment needs to be accessed according to measurement information of the user equipment; the source base station is a service base station of a source cell;

step 602, the source base station determines whether the mobile information of the user equipment to be switched can be obtained;

if yes, go to step 603; otherwise, go to step 606;

step 603, the source base station acquires the mobile information of the user equipment to be switched; the movement information includes: the current position information of the user equipment to be switched;

Step 604, the source base station sends a switching request message to a target base station, wherein the switching request message includes the mobile information of the user equipment to be switched; the target base station is a service base station of the target cell;

step 605, the source base station receives a handover response message sent by the target base station, where the handover response message includes: the TA of the user equipment to be switched; the TA of the user equipment to be switched is determined by the target base station according to the mobile information of the user equipment to be switched, and is determined according to the TA of the cooperative user equipment;

after step 605 is executed, step 609 is executed.

Step 606, the source base station distributes D2D information for the user equipment to be switched; the D2D information includes: the D2D identifier of the user equipment to be switched and first resource configuration information, where the first resource configuration information is used to indicate communication resources occupied by the D2D signal of the user equipment to be switched.

Step 607, the source base station sends a handover request message to a target base station, where the handover request message includes the information of D2D of the user equipment to be handed over; the target base station is a service base station of the target cell;

step 608, the source base station receives a handover response message sent by the target base station, where the handover response message includes: the TA of the user equipment to be switched; the TA of the user equipment to be switched is determined by the target base station according to the D2D information of the user equipment to be switched, and is determined according to the TA of the cooperative user equipment;

step 609, the source base station sends a switching indication message to the user equipment to be switched, wherein the switching indication message includes the TA of the user equipment to be switched.

The handover response message may further include: the cell wireless network of the user equipment to be switched in the target cell temporarily identifies the CRNTI and the second resource configuration information; wherein the second resource configuration information is used for indicating an initial uplink Grant resource (UL-Grant) allocated to the user equipment to be switched by the target base station;

correspondingly, the handover indication message may further include: the CRNTI and the second resource configuration information. By carrying the CRNTI and the second resource configuration information of the user equipment to be switched in the target cell in the switching indication message, the user equipment to be switched can obtain the CRNTI and the second resource configuration information of the user equipment to be switched in the target cell after receiving the switching indication message, and can communicate with the target base station according to the CRNTI and the second resource configuration information, thereby further reducing the switching delay.

In this embodiment, a handover request message including the movement information or D2D information of the ue to be handed over is sent to a target base station through a source base station, so that the target base station determines a cooperative ue for assisting the ue to be handed over to perform handover according to the movement information or D2D information of the ue to be handed over, and determines a TA of the ue to be handed over according to the TA of the cooperative ue; the source base station receives a switching response message which is sent by the target base station and comprises the TA of the user equipment to be switched, and sends the TA of the user equipment to be switched to the user equipment to be switched through a switching indication message; the random access process of the user equipment to be switched in the switching process is avoided, so that the air interface signaling overhead is reduced, and the switching delay is reduced.

Fig. 7 is a flowchart of a sixth embodiment of a method for inter-cell handover according to the present invention, as shown in fig. 7, the method of this embodiment may include:

step 701, a source base station sends a switching request message to a target base station, wherein the switching request message comprises the mobile information of the user equipment to be switched; the mobile information includes: the current position information of the user equipment to be switched; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell to which the user equipment to be switched needs to be accessed;

it should be noted that step 701 is the same as step 603, and is not described herein again.

Step 702, the target base station sends a location information request message to the serving user equipment in the target cell to obtain the current location information of the serving user equipment;

step 703, the target base station receives a location information report message sent by the serving ue; the location information reporting message comprises the location information of the service user equipment;

step 704, the target base station determines, according to the current location information of the serving user equipment and the current location information of the to-be-switched user equipment, that the user equipment whose distance to the to-be-switched user equipment is smaller than a preset threshold is the cooperative user equipment of the to-be-switched user equipment; determining the TA of the user equipment to be switched according to the TA of the cooperative user equipment;

it should be noted that step 704 is the same as step 302 and step 303, and is not described herein again.

It should be noted that fig. 7 shows a case where the target base station sends the location information request message to only one serving ue; it should be clear to those skilled in the art that the target base station may send a location information request to one or more serving user equipments.

Step 705, the target base station sends a handover response message to the source base station, where the handover response message includes the TA of the ue to be handed over;

it should be noted that step 705 is the same as step 304, and is not described herein again.

Step 706, after receiving the handover response message sent by the target base station, the source base station sends a handover indication message to the to-be-handed over user equipment, where the handover indication message includes a TA of the to-be-handed over user equipment;

it should be noted that step 706 is the same as step 609, and is not described herein again.

And 707, the ue to be handed over performs data transmission with the target base station using the TA included in the handover indication message.

Fig. 8 is a flowchart of a seventh embodiment of a method for inter-cell handover according to the present invention, as shown in fig. 8, the method of this embodiment may include:

step 801, a source base station sends a switching request message to a target base station, wherein the switching request message comprises D2D information of the user equipment to be switched; the D2D information includes: the D2D identifier of the user equipment to be switched and first resource configuration information, wherein the first resource configuration information is used for indicating communication resources occupied by the D2D signal of the user equipment to be switched; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell to which the user equipment to be switched needs to be accessed;

it should be noted that step 801 is the same as step 606, and is not described herein again.

Step 802, the target base station sends a D2D measurement indication message to a serving user equipment in the target cell; the D2D measurement indication message includes: D2D identification and first resource configuration information of the user equipment to be switched;

it should be noted that step 802 is the same as step 402, and is not described herein again.

Step 803, the target base station receives a D2D measurement response message sent by the serving user equipment; the D2D measurement response message includes D2D signal quality information; the D2D signal quality information is D2D signal quality information between the serving user equipment and the user equipment to be handed over, which is measured by the serving user equipment according to the D2D identifier of the user equipment to be handed over and the first resource configuration information;

it should be noted that step 802 is the same as step 403, and is not described herein again.

Step 804, the target base station determines that the serving user equipment with the best D2D signal quality is the cooperative user equipment of the user equipment to be switched; determining the TA of the user equipment to be switched according to the TA of the cooperative user equipment;

it should be noted that step 804 is the same as step 404 and step 405, and is not described herein again.

It should be noted that fig. 8 shows a case where the target base station sends the location information request message to only one serving ue; it should be clear to those skilled in the art that the target base station may send a location information request to one or more serving user equipments.

Step 805, the target base station sends a handover response message to the source base station, where the handover response message includes the TA of the ue to be handed over;

it should be noted that step 805 is the same as step 705, and is not described herein again.

Step 806, after receiving the handover response message sent by the target base station, the source base station sends a handover indication message to the to-be-handed over user equipment, where the handover indication message includes a TA of the to-be-handed over user equipment;

it should be noted that step 806 is the same as step 706, and is not described herein again.

And 807, the ue to be handed over performs data transmission with the target base station using the TA included in the handover indication message.

It should be noted that step 807 is the same as step 707, and is not described herein again.

Fig. 9 is a schematic structural diagram of a base station according to a first embodiment of the present invention, and as shown in fig. 9, the base station according to this embodiment may include: a receiving module 901, a determining module 902 and a sending module 903. The receiving module 901 is configured to receive a handover request message sent by a source base station, where the handover request message includes state information of a user equipment to be handed over; the source base station is a service base station of a source cell; a determining module 902, configured to determine, according to the state information of the to-be-switched user equipment, a cooperative user equipment for assisting the to-be-switched user equipment to perform switching, and determine, according to a TA of the cooperative user equipment, a TA of the to-be-switched user equipment; a sending module 903, configured to send a handover response message to the source base station, where the handover response message includes the TA of the ue to be handed over.

The base station in this embodiment is a serving base station of a target cell, and may be configured to execute the technical solution of the method embodiment shown in fig. 2, where the implementation principle and the technical effect are similar, and are not described herein again.

Second embodiment of base station

On the basis of the first base station embodiment, optionally, the determining module 902 is specifically configured to:

determining that the TA of the user equipment to be switched is equal to the TA of the cooperative user equipment; or,

determining that the TA of the user equipment to be switched is equal to the sum of the TA of the cooperative user equipment and the offset value; wherein the offset value is determined according to a distance between the cooperative user equipment and the user equipment to be switched.

Optionally, the state information may be mobile information of the user equipment to be switched; the movement information includes: the current position information of the user equipment to be switched; the determining module 902 is specifically configured to: and determining the user equipment with the distance to the user equipment to be switched being smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched according to the current position information of the user equipment to be switched.

Optionally, the movement information may further include location correction information, where the location correction information includes at least one of the following information: the moving speed, moving direction and position precision of the user equipment to be switched; the determining module 902 is specifically configured to: and according to the current position information of the user equipment to be switched and the position correction information, obtaining the corrected position information of the user equipment to be switched, and according to the corrected position information of the user equipment to be switched, determining the user equipment with the distance between the user equipment to be switched and the user equipment to be switched smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched.

The base station in this embodiment is a serving base station of a target cell, and may be configured to execute the technical solution of the method embodiment shown in fig. 3, where the implementation principle and the technical effect are similar, and are not described herein again.

Third embodiment of base station

On the basis of the first embodiment of the base station, optionally, the state information may be D2D information of the user equipment to be switched; the D2D information includes: the D2D identifier of the user equipment to be switched and first resource configuration information, wherein the first resource configuration information is used for indicating communication resources occupied by the D2D signal of the user equipment to be switched; the determining module 902 is specifically configured to: sending a D2D measurement indication message to a serving user equipment within the target cell; the D2D measurement indication message includes: D2D identification and first resource configuration information of the user equipment to be switched; receiving a D2D measurement response message sent by the serving user equipment; the D2D measurement response message includes D2D signal quality information; the D2D signal quality information is D2D signal quality information between the serving user equipment and the user equipment to be handed over, which is measured by the serving user equipment according to the D2D identifier of the user equipment to be handed over and the first resource configuration information; and determining that the service user equipment with the best D2D signal quality is the cooperative user equipment of the user equipment to be switched.

Optionally, the handover response message may further include: the cell wireless network of the user equipment to be switched in the target cell temporarily identifies the CRNTI and the second resource configuration information; wherein the second resource configuration information is used to indicate the initial uplink Grant resource (UL-Grant) allocated to the user equipment to be switched by the target base station.

The base station in this embodiment is a serving base station of a target cell, and may be configured to execute the technical solution of the method embodiment shown in fig. 4, where the implementation principle and the technical effect are similar, and are not described herein again.

Fig. 10 is a schematic structural diagram of a fourth base station according to the present invention, and as shown in fig. 10, the base station of this embodiment may include: a switching request sending module 1001, a receiving module 1002 and a switching instruction sending module 1003. A handover request sending module 1001, configured to send a handover request message to a target base station, where the handover request message includes state information of the ue to be handed over; the target base station is a service base station of a target cell to which the user equipment to be switched needs to be accessed; a receiving module 1002, configured to receive a handover response message sent by the target base station, where the handover response message includes: the TA of the UE to be switched; the TA of the user equipment to be switched is determined by the target base station according to the state information of the user equipment to be switched, and is determined according to the TA of the cooperative user equipment; a handover indication sending module 1003, configured to send a handover indication message to the ue to be handed over, where the handover indication message includes a TA of the ue to be handed over.

The base station of this embodiment is a serving base station of a source cell, and may be configured to execute the technical solution of the method embodiment shown in fig. 5, where the implementation principle and the technical effect are similar, and are not described herein again.

Fig. 11 is a schematic structural diagram of a fifth embodiment of a base station of the present invention, and as shown in fig. 11, the base station of this embodiment may further include, on the basis of the base station structure shown in fig. 10: a determining module 1004, the determining module 1004 is configured to determine the status information of the ue to be switched; wherein the status information includes: movement information of the user equipment to be switched or device-to-device D2D information.

Optionally, the determining module 1004 is specifically configured to: determining whether the mobile information of the user equipment to be switched can be obtained; if so, acquiring the mobile information of the user equipment to be switched; otherwise, distributing D2D information for the user equipment to be switched.

Wherein the mobile information includes: the current position information of the user equipment to be switched; the D2D information, comprising: the D2D identifier of the user equipment to be switched and first resource configuration information, where the first resource configuration information is used to indicate communication resources occupied by the D2D signal of the user equipment to be switched.

Optionally, the handover response message may further include: the cell wireless network of the user equipment to be switched in the target cell temporarily identifies the CRNTI and the second resource configuration information; wherein the second resource configuration information is used for indicating an initial uplink Grant resource (UL-Grant) allocated to the user equipment to be switched by the target base station; correspondingly, the handover indication message may further include: the CRNTI and the second resource configuration information.

The base station of this embodiment is a serving base station of a source cell, and may be configured to execute the technical solution of the method embodiment shown in fig. 6, where the implementation principle and the technical effect are similar, and are not described herein again.

Fig. 12 is a schematic structural diagram of a sixth embodiment of a base station of the present invention, and as shown in fig. 12, the base station of this embodiment may include: a receiver 1201, a processor 1202, and a transmitter 1203. The receiver 1201 is configured to receive a handover request message sent by a source base station, where the handover request message includes state information of a user equipment to be handed over; the source base station is a service base station of a source cell; a processor 1202, configured to determine, according to the state information of the to-be-switched user equipment, a cooperative user equipment for assisting the to-be-switched user equipment to perform switching, and determine, according to a TA of the cooperative user equipment, a TA of the to-be-switched user equipment; a transmitter 1203, configured to send a handover response message to the source base station, where the handover response message includes the TA of the ue to be handed over.

Seventh embodiment of the base station

On the basis of the sixth embodiment of the base station, optionally, the processor 1202 is specifically configured to:

Optionally, the state information may be mobile information of the user equipment to be switched; the movement information includes: the current position information of the user equipment to be switched; the processor 1202 is specifically configured to: and determining the user equipment with the distance to the user equipment to be switched being smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched according to the current position information of the user equipment to be switched.

Optionally, the movement information may further include location correction information, where the location correction information includes at least one of the following information: the moving speed, moving direction and position precision of the user equipment to be switched; the processor 1202 is specifically configured to: and according to the current position information of the user equipment to be switched and the position correction information, obtaining the corrected position information of the user equipment to be switched, and according to the corrected position information of the user equipment to be switched, determining the user equipment with the distance between the user equipment to be switched and the user equipment to be switched smaller than a preset threshold as the cooperative user equipment of the user equipment to be switched.

Eighth base station embodiment

On the basis of the sixth embodiment of the base station, optionally, the state information may be D2D information of the user equipment to be switched; the D2D information includes: the D2D identifier of the user equipment to be switched and first resource configuration information, wherein the first resource configuration information is used for indicating communication resources occupied by the D2D signal of the user equipment to be switched; the processor 1202 is specifically configured to: sending a D2D measurement indication message to a serving user equipment within the target cell; the D2D measurement indication message includes: D2D identification and first resource configuration information of the user equipment to be switched; receiving a D2D measurement response message sent by the serving user equipment; the D2D measurement response message includes D2D signal quality information; the D2D signal quality information is D2D signal quality information between the serving user equipment and the user equipment to be handed over, which is measured by the serving user equipment according to the D2D identifier of the user equipment to be handed over and the first resource configuration information; and determining that the service user equipment with the best D2D signal quality is the cooperative user equipment of the user equipment to be switched.

Fig. 13 is a schematic structural diagram of a ninth embodiment of a base station of the present invention, and as shown in fig. 13, the base station of this embodiment may include: a transmitter 1301 and a receiver 1302. The transmitter 1301 is configured to send a handover request message to a target base station, where the handover request message includes state information of the to-be-handed over user equipment; the target base station is a service base station of a target cell to which the user equipment to be switched needs to be accessed; a receiver 1302, configured to receive a handover response message sent by the target base station, where the handover response message includes: the TA of the UE to be switched; the TA of the user equipment to be switched is determined by the target base station according to the state information of the user equipment to be switched, and is determined according to the TA of the cooperative user equipment; the transmitter 1301 is further configured to send a handover indication message to the to-be-handed over user equipment, where the handover indication message includes a TA of the to-be-handed over user equipment.

Fig. 14 is a schematic structural diagram of a tenth embodiment of the base station of the present invention, and as shown in fig. 14, the base station of this embodiment may further include, on the basis of the base station structure shown in fig. 13: a processor 1303, wherein the processor 1303 is configured to determine the status information of the ue to be switched; wherein the status information includes: movement information of the user equipment to be switched or device-to-device D2D information.

Optionally, the processor 1303 is specifically configured to: determining whether the mobile information of the user equipment to be switched can be obtained; if so, acquiring the mobile information of the user equipment to be switched; otherwise, distributing D2D information for the user equipment to be switched.

The invention also provides a system for switching among cells, which comprises: the base station described in the first embodiment, the second embodiment, or the third embodiment of the base station, and the base station described in the fourth embodiment or the fifth embodiment of the base station.

The system of this embodiment may be used to implement the technical solutions of the method embodiments shown in fig. 7 and fig. 8, and the implementation principles and technical effects are similar, which are not described herein again.

Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for inter-cell handover, comprising:

receiving a switching response message sent by a target base station through a source base station by user equipment to be switched, wherein the switching response message comprises at least one of time advance TA of the user equipment to be switched, cell radio network temporary identification CRNTI and initial uplink authorization resource UL-Grant; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell.

2. The method according to claim 1, wherein the time advance TA of the ue to be handed over is determined by the target base station according to the mobility information of the ue to be handed over, and is determined according to the TA of the cooperative ue.

3. The method according to claim 2, wherein the TA of the ue to be switched is equal to the TA of the cooperative ue; or,

the TA of the user equipment to be switched is equal to the sum of the TA of the cooperative user equipment and the offset value; wherein the offset value is determined by the target base station according to the position relationship between the cooperative user equipment and the user equipment to be switched.

4. The method according to claim 1, wherein before the ue to be handed over receives the handover response message sent by the target base station through the source base station, the method further comprises:

the user equipment to be switched sends mobile information to the source base station so that the source base station sends a switching request message to the target base station, wherein the switching request message comprises the mobile information of the user equipment to be switched; the mobile information comprises the current position information of the user equipment to be switched.

5. The method of claim 4, wherein the movement information further comprises location correction information, wherein the location correction information comprises at least one of the following information:

6. A method for inter-cell handover, comprising:

a target base station sends a switching response message to user equipment to be switched through a source base station, wherein the switching response message comprises at least one of time advance TA of the user equipment to be switched, cell radio network temporary identification CRNTI and initial uplink authorization resource UL-Grant; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell.

7. The method according to claim 6, wherein before the target base station sends the handover response message to the user equipment to be handed over through the source base station, the method further comprises:

the target base station receives a switching request message sent by the source base station, wherein the switching request message comprises the mobile information of the user equipment to be switched;

and the target base station determines cooperative user equipment for assisting the user equipment to be switched to carry out switching according to the movement information of the user equipment to be switched, and determines TA of the user equipment to be switched according to TA of the time advance of the cooperative user equipment.

8. The method according to claim 7, wherein the determining, by the target base station, the TA of the ue to be handed off according to the TA of the cooperative ue comprises:

the target base station determines that the TA of the user equipment to be switched is equal to the TA of the cooperative user equipment;

or,

9. The method of claim 7, wherein the movement information comprises: the current position information of the user equipment to be switched;

correspondingly, the determining, by the target base station, the cooperative user equipment for assisting the user equipment to be switched to perform switching according to the movement information of the user equipment to be switched includes:

10. The method of claim 9, wherein the movement information further comprises location correction information, wherein the location correction information comprises at least one of:

11. User equipment, wherein the user equipment is to-be-switched user equipment, comprising:

a receiving module, configured to receive a handover response message sent by a target base station through a source base station, where the handover response message includes at least one of a timing advance TA of the user equipment to be handed over, a cell radio network temporary identifier CRNTI, and an initial uplink Grant resource UL-Grant; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell.

12. The UE of claim 11, wherein the TA of the UE to be handed over is determined by the target base station according to the mobility information of the UE to be handed over, and is determined according to the TA of the cooperative UE.

13. The UE of claim 12, wherein the TA of the UE to be switched is equal to the TA of the cooperative UE; or,

14. The user equipment of claim 11, further comprising:

a sending module, configured to send mobility information to a source base station before the receiving module receives a handover response message sent by a target base station through the source base station, so that the source base station sends a handover request message to the target base station, where the handover request message includes mobility information of the to-be-handed over user equipment; the mobile information comprises the current position information of the user equipment to be switched.

15. The UE of claim 14, wherein the mobility information further comprises location correction information, and wherein the location correction information comprises at least one of the following information:

16. A target base station, comprising:

a sending module, configured to send a handover response message to a to-be-handed over user equipment through a source base station, where the handover response message includes at least one of a time advance TA of the to-be-handed over user equipment, a cell radio network temporary identification CRNTI, and an initial uplink Grant resource UL-Grant; the source base station is a service base station of a source cell, and the target base station is a service base station of a target cell.

17. The base station of claim 16, further comprising:

a receiving module, configured to receive a handover request message sent by a source base station before the sending module sends a handover response message to a to-be-handed over user equipment through the source base station, where the handover request message includes mobile information of the to-be-handed over user equipment;

a determining module, configured to determine, according to the movement information of the ue to be switched, a cooperative ue for assisting the ue to be switched to perform switching, and determine, according to a timing advance TA of the cooperative ue, a TA of the ue to be switched.

18. The base station of claim 17, wherein the determining module is specifically configured to: determining that the TA of the user equipment to be switched is equal to the TA of the cooperative user equipment;

or,

19. The base station of claim 17, wherein the mobility information comprises: the current position information of the user equipment to be switched;

20. The base station of claim 19, wherein the movement information further comprises position correction information, and wherein the position correction information comprises at least one of the following information:

21. An inter-cell handover system, comprising: the user equipment of any one of claims 11 to 15 and the base station of any one of claims 16 to 20.