WO2014059663A1

WO2014059663A1 - Switching method and device

Info

Publication number: WO2014059663A1
Application number: PCT/CN2012/083208
Authority: WO
Inventors: 曾清海; 郭轶
Original assignee: 华为技术有限公司
Priority date: 2012-10-19
Filing date: 2012-10-19
Publication date: 2014-04-24
Also published as: CN104255056A; CN104255056B

Abstract

The embodiments of the present invention relate to a switching method and device. The method comprises: a source base station determining to switch downlink transmission of a user equipment to a first cell or to switch uplink transmission of the user equipment to the first cell; the source base station sending a switching request to a target base station corresponding to the first cell, the switching request having information about the downlink transmission or information about the uplink transmission to be switched of the user equipment; and the source base station sending a switching command to the user equipment, the switching command having information about a downlink resource configuration allocated for the user equipment corresponding to the downlink transmission to be switched or information about an uplink resource configuration corresponding to the uplink transmission to be switched. Thus, one of the uplink transmission and the downlink transmission of the user equipment is provided with a cell service by the source base station, and the other is provided with a cell service by the target base station, thereby improving the cell throughput and the spectrum efficiency.

Description

Switching method and device

The present invention relates to the field of communications technologies, and in particular, to a handover method and device. BACKGROUND In Heterogeneous Network (Hetnet), some low power nodes (LPNs) are deployed in the coverage of a macro base station to provide hotspot coverage, increase cell capacity and load Balance and so on.

In the prior art, a user equipment (UE) of a macro cell is switched to a micro cell by setting a cell range extension (CRE) for a pico cell, in a CRE range. The UE accesses the micro cell, and the micro cell serves as a serving cell, and both the downlink and the uplink are served by the micro cell. However, in this technique, in order to reduce the interference of the macro cell to the downlink of the UE, the macro cell transmits the control signaling and the user data without transmitting or low power in the set almost blank subframes (ABS), thereby reducing the cell throughput. And spectral efficiency. SUMMARY OF THE INVENTION The present invention provides a handover method and apparatus to improve cell throughput and spectrum efficiency.

A first aspect of the present invention provides a handover method, including:

The source base station determines to switch the downlink transmission of the user equipment to the first cell or to switch the uplink transmission of the user equipment to the first cell;

The source base station sends a handover request to the target base station corresponding to the first cell, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

The source base station sends a handover command to the user equipment, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched, so that After the handover, the user equipment maintains the uplink transmission with the source base station, and the user equipment performs the downlink transmission via the target base station, or the user equipment maintains the foregoing relationship with the source base station after handover Downlink transmission and via the target base station Performing the uplink transmission;

The downlink transmission information and the downlink resource configuration information include a handover type indication for indicating a downlink transmission handover, or the uplink transmission information and the uplink resource configuration information include an indication for performing uplink transmission handover. Switch type indication.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the source base station, the downlink transmission of the user equipment to the first cell, specifically: when the source base station is a micro base station, When the target base station is a macro base station, the micro base station determines to switch the downlink transmission of the user equipment to the first cell served by the macro base station; or the source base station determines that the user equipment is to be used. The uplink transmission is switched to the first cell, and the method includes: when the source base station is a macro base station, and the target base station is a micro base station, the macro base station determines to switch the uplink transmission of the user equipment to be used by the micro base station The first cell providing the service.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the first cell and the service that provides a service to the user equipment before the handover The coverage of the cell corresponding to the source base station overlaps; or, the frequency of the target base station overlaps with the frequency of the source base station.

With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the source base station Before the target base station sends the handover request message, the method further includes: the source base station sending a radio resource allocation request message to the target base station, where the allocation request message is used by the target base station in the first cell as the user The device allocates a downlink resource corresponding to the downlink transmission to be switched or an uplink resource corresponding to the uplink transmission to be switched.

With reference to the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, or the third possible implementation of the first aspect, the fourth In a possible implementation, the method further includes: the source base station sending, to the user equipment, a medium access control layer control unit MAC CE, where the MAC CE is used to indicate whether to allow uplink transmission and downlink transmission separation.

With reference to the first aspect, or the first possible implementation of the first aspect to any one of the possible implementations of the fourth possible implementation of the first aspect, the fifth possible implementation of the first aspect In the manner, the downlink transmission information further includes one or any combination of the following: at least one evolved radio access bearer E-RAB identifier, and the E-RAB corresponding to the at least one E-RAB identifier a service quality parameter, a radio resource control context information, where the radio resource control context information includes: downlink radio resource specific configuration information and/or cell-radio network temporary identifier C-RNTI information of the user equipment; The information includes one or any combination of the following: at least one E-RAB identifier, an E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; where the radio resource control context information includes : uplink radio resource specific configuration information and/or C-RNTI information of the user equipment.

With reference to the first aspect, or the first possible implementation of the first aspect to any one of the possible implementations of the fifth possible implementation of the first aspect, the sixth possible implementation of the first aspect In the mode, the downlink resource configuration information that is allocated to the user equipment includes one or any combination of the following: signaling radio bearer SRB downlink configuration information, data radio bearer DRB downlink configuration information, and media access control MAC downlink configuration information. The physical downlink shared channel PDSCH configuration information; the uplink resource configuration information allocated to the user equipment includes one or any combination of the following: SRB uplink configuration information, DRB uplink configuration information, MAC uplink configuration information, and PUSCH configuration information.

With reference to the first aspect, or the first possible implementation of the first aspect to any one of the possible implementations of the sixth possible implementation of the first aspect, the seventh possible implementation of the first aspect In the mode, the handover command further includes an indication identifier, where the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be switched and retain the source. An uplink between the base stations; or, the indication identifier is used to indicate that the user equipment and the target base station newly establish an uplink for carrying the uplink transmission to be switched and reserve with the source base station The downlink identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be switched or newly establish an uplink transmission for carrying the to-be-switched Uplink and reserve uplink and downlink with the source base station.

A second aspect of the present invention provides a handover method, including:

The target base station receives a handover request sent by the source base station, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

Determining, by the target base station, that the downlink transmission or the uplink transmission of the user equipment is allowed to be switched to the first cell provided by the target base station;

Sending, by the target base station, the downlink transmission to be switched allocated to the user equipment to the source base station Transmitting the corresponding downlink resource configuration information or the uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user equipment maintains the uplink transmission with the source base station and performs the downlink transmission via the target base station after the handover, Or the user equipment maintains the downlink transmission with the source base station after the handover and performs the uplink transmission via the target base station;

The downlink transmission information includes a handover type indication for indicating a downlink transmission handover, or the uplink transmission information includes a handover type indication for indicating an uplink transmission handover.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the determining, by the target base station, that the downlink transmission of the user equipment is allowed to be switched to the first cell provided by the target base station, includes: The source base station is a micro base station, and when the target base station is a macro base station, the target base station determines that the downlink transmission of the user equipment is allowed to be switched to the first cell provided by the target base station; or the target base station determines to allow the The uplink transmission of the user equipment is switched to the first cell provided by the target base station, and the method includes: when the source base station is a macro base station, and the target base station is a micro base station, the target base station determines to allow uplink of the user equipment. The transmission is switched to the first cell provided by the target base station.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, before the target base station receives the handover request sent by the source base station, the method further includes: Receiving, by the target base station, a radio resource allocation request message sent by the source base station, where the radio resource allocation request message is used by the target base station to allocate downlink resources corresponding to the downlink transmission to be switched for the user equipment in the first cell. Or the uplink resource corresponding to the uplink transmission to be switched.

With reference to the second aspect, the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, in the third possible implementation manner of the second aspect, the downlink transmission information is further The following one or any combination of the following: at least one evolved radio access bearer E-RAB identifier, E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; wherein, the wireless The resource control context information includes: downlink radio resource specific configuration information and/or cell-radio network temporary identifier C-RNTI information of the user equipment; the uplink transmission information includes one or any combination of the following: at least one E-RAB The identifier, the E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and the radio resource control context information, where the radio resource control context information includes: uplink radio resource dedicated configuration information and/or The C-RNTI information of the user equipment.

A third aspect of the present invention provides a handover method, including:

The user equipment receives the handover command sent by the source base station, where the handover command has the downlink resource configuration information corresponding to the downlink transmission to be switched and the uplink resource configuration information corresponding to the uplink transmission to be switched.

The user equipment performs the downlink resource configuration according to the downlink resource configuration information, and after the handover, the uplink transmission with the source base station is performed, and the downlink transmission is performed by using the target base station; or the uplink resource is performed according to the uplink resource configuration information. Configuring to maintain the downlink transmission with the source base station after handover and perform the uplink transmission via the target base station;

The downlink resource configuration information includes a handover type indication for indicating a downlink transmission handover, or the uplink resource configuration information includes a handover type indication for indicating an uplink transmission handover.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the switching command that is received by the user equipment further includes an indication identifier, where the indication identifier is used to indicate the user equipment and the target The base station newly establishes a downlink for carrying the downlink transmission to be switched and reserves an uplink with the source base station; or, the indication identifier is used to indicate that the user equipment and the target base station are newly created. And carrying the uplink of the uplink transmission to be switched and retaining a downlink with the source base station; or, the indication identifier is used to indicate that the user equipment and the target base station are newly used for a bearer Determining a downlink of the downlink transmission of the handover or newly establishing an uplink for carrying the uplink transmission to be handed over, and retaining an uplink and a downlink with the source base station.

With the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the method further includes: the user equipment dividing the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, the uplink PDCP entity corresponding to the second cell provided by the source base station, the downlink PDCP entity corresponding to the first cell provided by the target base station; the user equipment dividing the RLC entity into an uplink An RLC entity and a downlink RLC entity, where the uplink RLC entity corresponds to the second cell provided by the source base station, where the downlink RLC entity corresponds to the first cell provided by the target base station; The first cell performs the downlink transmission with the target base station, and performs the uplink transmission with the source base station via the second cell. With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the source base station is a micro base station, and the target base station is a macro base station.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the method further includes: the user equipment dividing the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, the uplink PDCP entity corresponding to the first cell provided by the target base station, the downlink PDCP entity corresponding to the second cell provided by the source base station; the user equipment dividing the RLC entity into an uplink An RLC entity and a downlink RLC entity, where the uplink RLC entity corresponds to the first cell provided by the target base station, and the downlink RLC entity corresponds to the second cell provided by the source base station; The first cell performs the uplink transmission with the target base station, and performs the downlink transmission with the source base station via the second cell.

With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the source base station is a macro base station, and the target base station is a micro base station.

A fourth aspect of the present invention provides a base station, including:

a determining unit, configured to determine to switch downlink transmission of the user equipment to the first cell or to switch uplink transmission of the user equipment to the first cell;

a sending unit, configured to send a handover request to the target base station corresponding to the first cell, where the switching request has downlink transmission information or uplink transmission information to be switched by the user equipment;

The sending unit is further configured to send, to the user equipment, a handover command, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched and the uplink resource corresponding to the uplink transmission to be switched. Configuring information, so that the user equipment maintains the uplink transmission with the base station after handover, and the user equipment performs the downlink transmission via the target base station, or maintains the downlink transmission with the base station after handover And the user equipment performs the uplink transmission via the target base station;

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the determining unit is specifically configured to: when the base station is a micro base station, and the target base station is a macro base station, determine that the user equipment is Downlink transmission is switched to the first cell served by the macro base station; or, when The base station is a macro base station, and when the target base station is a micro base station, it is determined that the uplink transmission of the user equipment is switched to the first cell served by the micro base station.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the first cell and the service that provides a service to the user equipment before the handover The coverage of the cell corresponding to the base station overlaps; or, the base station overlaps with the frequency of the target base station.

With reference to the fourth aspect, the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, in the third possible implementation manner of the fourth aspect, the sending unit is further used And sending a radio resource allocation request message to the target base station, where the allocation request message is used by the target base station to allocate, to the user equipment, a downlink resource corresponding to a downlink transmission to be switched or to be switched in the first cell. The uplink resource corresponding to the uplink transmission.

With reference to the fourth aspect, or the first possible implementation of the fourth aspect to any one of the possible implementations of the third possible implementation of the fourth aspect, the fourth possible implementation of the fourth aspect In the mode, the sending unit is further configured to: send, to the user equipment, a medium access control layer control unit MAC CE, where the MAC CE is used to indicate whether to allow uplink transmission and downlink transmission separation.

With reference to the fourth aspect, or the first possible implementation of the fourth aspect to any one of the possible implementations of the fourth possible implementation of the fourth aspect, the fifth possible implementation of the fourth aspect In the manner, the downlink transmission information further includes one or any combination of the following: at least one evolved radio access bearer E-RAB identifier, E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource Controlling the context information, where the radio resource control context information includes: downlink radio resource specific configuration information and/or cell-radio network temporary identifier C-RNTI information of the user terminal; the uplink transmission information includes one or the following Any combination of the at least one E-RAB identifier, the E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and the radio resource control context information; wherein the radio resource control context information includes: Information and/or C-RNTI information of the user terminal.

With reference to the fourth aspect, or the first possible implementation of the fourth aspect to any one of the possible implementations of the fifth possible implementation of the fourth aspect, the sixth possible implementation of the fourth aspect In the mode, the downlink resource configuration information allocated to the user equipment includes one or any combination of the following: signaling radio bearer SRB downlink configuration information, data radio bearer DRB downlink The configuration information, the medium access control MAC downlink configuration information, and the physical downlink shared channel PDSCH configuration information; the uplink resource configuration information allocated to the user equipment includes one or any combination of the following: SRB uplink configuration information, DRB uplink configuration Information, MAC uplink configuration information, PUSCH configuration information.

With reference to the fourth aspect, or the first possible implementation of the fourth aspect to any one of the possible implementations of the sixth possible implementation of the fourth aspect, the seventh possible implementation of the fourth aspect In the mode, the handover command further includes an indication identifier, where the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying downlink transmissions to be handed over and reserve with the base station. Uplink; or, the indication identifier is used to indicate that the user equipment and the target base station newly establish an uplink for carrying the uplink transmission to be switched and reserve a downlink with the base station Or the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be switched or newly establish an uplink for carrying the uplink transmission to be switched. And retaining the uplink and downlink with the base station. A fifth aspect of the present invention provides a base station, including:

a receiving unit, configured to receive a handover request message sent by the source base station, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

a determining unit, configured to determine that the downlink transmission or the uplink transmission of the user equipment is allowed to be switched to the first cell provided by the base station;

a sending unit, configured to send, to the source base station, downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user equipment remains after the handover The downlink transmission with the source base station and the user equipment performs the downlink transmission via the base station after handover, or the user equipment maintains the downlink transmission with the source base station after handover Said user equipment performs said uplink transmission via said base station after handover;

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the determining unit is specifically configured to: when the source base station is a micro base station, and the base station is a macro base station, determining to allow the user Downlink transmission of the device is switched to the first cell provided by the base station; or, when the source base station is a macro And determining, by the base station, that the base station is a micro base station, and determining that the uplink transmission of the user equipment is allowed to be switched to the first cell provided by the base station.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in the second possible implementation manner of the fifth aspect, the receiving unit is further configured to receive the radio resource allocation sent by the source base station a request message, the radio resource allocation request message is used by the base station in the first cell to allocate, to the user equipment, a downlink resource corresponding to a downlink transmission to be switched or an uplink resource corresponding to an uplink transmission to be switched.

With the fifth aspect, the first possible implementation manner of the fifth aspect, or the second possible implementation manner of the fifth aspect, in the third possible implementation manner of the fifth aspect, the downlink transmission information is further The following one or any combination of the following: at least one evolved radio access bearer E-RAB identifier, E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; wherein, the wireless The resource control context information includes: downlink radio resource specific configuration information and/or cell-radio network temporary identifier C-RNTI information of the user equipment; the uplink transmission information includes one or any combination of the following: at least one E-RAB The identifier, the E-RAB service quality parameter corresponding to the at least one E-RAB identifier, and the radio resource control context information, where the radio resource control context information includes: uplink radio resource specific configuration information and/or the user equipment C-RNTI information.

A sixth aspect of the present invention provides a user equipment, including:

a receiving unit, configured to receive a handover command sent by the source base station, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched;

a configuration unit, configured to perform downlink resource configuration according to the downlink resource configuration information, maintain the uplink transmission with the source base station after the handover, and perform the downlink transmission by using the target base station after the handover; or configure according to the uplink resource The information is configured to perform uplink resource allocation, and after the handover, the downlink transmission with the source base station is maintained, and the user equipment performs the uplink transmission by using the target base station after handover;

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the switching command The indication identifier is further used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be switched and reserve an uplink with the source base station. Or the indication identifier is used to indicate that the user equipment and the target base station newly establish an uplink for carrying the uplink transmission to be switched and reserve a downlink with the source base station; or The indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be switched or newly establish an uplink for carrying the uplink transmission to be switched, and keep An uplink and a downlink between the source base station and the source base station.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, the second possible implementation manner of the sixth aspect, further includes: a dividing unit, configured to: divide the PDCP entity into an uplink PDCP entity And a downlink PDCP entity, where the uplink PDCP entity corresponds to the second cell provided by the source base station, the downlink PDCP entity corresponds to the first cell provided by the target base station; and the RLC entity is divided into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponding to the second cell provided by the source base station, the downlink RLC entity corresponding to the first cell provided by the target base station, where the user equipment is connected to the first cell Performing the downlink transmission with the target base station, and performing the uplink transmission with the source base station via the second cell.

With reference to the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the source base station is a micro base station, and the target base station is a macro base station.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, the fourth possible implementation manner of the sixth aspect, further includes: a dividing unit, configured to: divide the PDCP entity into an uplink PDCP entity And a downlink PDCP entity, where the uplink PDCP entity corresponds to the first cell provided by the target base station, the downlink PDCP entity corresponds to the second cell provided by the source base station, and the RLC entity is divided into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponding to the first cell provided by the target base station, the downlink RLC entity corresponding to the second cell provided by the source base station, where the user equipment is connected to the first cell Performing the uplink transmission with the target base station, and performing the downlink transmission with the source base station via the second cell.

With reference to the fourth possible implementation manner of the sixth aspect, in a fifth possible implementation manner of the sixth aspect, the source base station is a macro base station, and the target base station is a micro base station.

A seventh aspect of the present invention provides a base station, including:

a processor, configured to determine to switch downlink transmission of the user equipment to the first cell or to switch uplink transmission of the user equipment to the first cell; a transmitter, configured to send a handover request to a target base station corresponding to the first cell, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

The transmitter is further configured to send, to the user equipment, a handover command, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment, or an uplink resource corresponding to the uplink transmission to be switched. Configuring information such that the user equipment maintains the uplink transmission with the base station after handover, and the user equipment performs the downlink transmission via the target base station after handover, or maintains a location with the base station after handover Determining downlink transmission, and the user equipment performs the uplink transmission via the target base station after handover;

With reference to the seventh aspect, in a first possible implementation manner of the seventh aspect, the processor is specifically configured to: when the base station is a micro base station, and the target base station is a macro base station, determine that the user equipment is The downlink transmission is switched to the first cell served by the macro base station; or, when the base station is a macro base station, and the target base station is a micro base station, determining to switch the uplink transmission of the user equipment to The micro base station provides the first cell of the service.

With reference to the seventh aspect, or the first possible implementation manner of the seventh aspect, in the second possible implementation manner of the seventh aspect, the first cell and the service that provides a service to the user equipment before switching The coverage of the cell corresponding to the source base station overlaps; or, the frequency of the target base station overlaps with the frequency of the source base station.

With reference to the seventh aspect, the first possible implementation manner of the seventh aspect, or the second possible implementation manner of the seventh aspect, in a third possible implementation manner of the seventh aspect, And sending a radio resource allocation request message to the target base station, where the allocation request message is used by the target base station to allocate, to the user equipment, a downlink resource corresponding to a downlink transmission to be switched or to be switched in the first cell. The uplink resource corresponding to the uplink transmission.

With reference to the seventh aspect, or the first possible implementation of the seventh aspect to any one of the possible implementations of the third possible implementation of the seventh aspect, the fourth possible implementation of the seventh aspect In the mode, the transmitter is further configured to: send, to the user equipment, a medium access control layer control unit MAC CE, where the MAC CE is used to indicate whether to allow uplink transmission and downlink transmission separation.

Combining the seventh aspect, or the first possible implementation of the seventh aspect to the fourth aspect of the seventh aspect In a fifth possible implementation manner of the seventh aspect, the downlink transmission information further includes one or any combination of the following: at least one evolved wireless connection The E-RAB service quality parameter corresponding to the at least one E-RAB identifier and the radio resource control context information, where the radio resource control context information includes: downlink radio resource specific configuration information and/or The cell-radio network temporarily identifies the C-RNTI information of the user terminal; the uplink transmission information includes one or any combination of the following: at least one E-RAB identifier, and the E-RAB corresponding to the at least one E-RAB identifier The QoS parameter, the radio resource control context information, where the radio resource control context information includes: uplink radio resource specific configuration information and/or C-RNTI information of the user terminal.

With reference to the seventh aspect, or the first possible implementation manner of the seventh aspect, to any one of the possible implementation manners of the fifth possible implementation manner of the seventh aspect, the sixth possible implementation in the seventh aspect In the mode, the downlink resource configuration information that is allocated to the user equipment includes one or any combination of the following: signaling radio bearer SRB downlink configuration information, data radio bearer DRB downlink configuration information, and media access control MAC downlink configuration information. The physical downlink shared channel PDSCH configuration information; the uplink resource configuration information allocated to the user equipment includes one or any combination of the following: SRB uplink configuration information, DRB uplink configuration information, MAC uplink configuration information, and PUSCH configuration information.

With reference to the seventh aspect, or the first possible implementation manner of the seventh aspect, to any one of the possible implementation manners of the sixth possible implementation manner of the seventh aspect, the seventh possible implementation of the seventh aspect In the mode, the handover command further includes an indication identifier, where the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying downlink transmissions to be handed over and reserve with the base station. Uplink; or, the indication identifier is used to indicate that the user equipment and the target base station newly establish an uplink for carrying the uplink transmission to be switched and reserve a downlink with the base station Or the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be switched or newly establish an uplink for carrying the uplink transmission to be switched. And retaining the uplink and downlink with the base station.

An eighth aspect of the present invention provides a base station, including:

a receiver, configured to receive a handover request message sent by the source base station, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

a processor, configured to determine that the downlink transmission or the uplink transmission of the user equipment is allowed to be switched to the a first cell provided by the base station;

a transmitter, configured to send, to the source base station, downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user equipment remains after the handover The downlink transmission with the source base station and the user equipment performs the downlink transmission via the base station after handover, or the user equipment maintains the downlink transmission with the source base station after handover Said user equipment performs said uplink transmission via said base station after handover;

With reference to the eighth aspect, in a first possible implementation manner of the eighth aspect, the processor is specifically configured to: when the source base station is a micro base station, where the base station is a macro base station, determining to allow the user The downlink transmission of the device is switched to the first cell provided by the base station; or when the source base station is a macro base station, and the base station is a micro base station, determining that the uplink transmission of the user equipment is allowed to be switched to the base station First cell.

With reference to the eighth aspect, or the first possible implementation manner of the eighth aspect, in a second possible implementation manner of the eighth aspect, the receiving, by the source base station, a radio resource allocation request message, the radio resource allocation The request message is used by the base station in the first cell to allocate the downlink resource corresponding to the downlink transmission to be switched or the uplink resource corresponding to the uplink transmission to be switched.

With reference to the eighth aspect, the first possible implementation manner of the eighth aspect, or the second possible implementation manner of the eighth aspect, in the third possible implementation manner of the eighth aspect, the downlink transmission information is further The following one or any combination of the following: at least one evolved radio access bearer E-RAB identifier, E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; wherein, the wireless The resource control context information includes: downlink radio resource specific configuration information and/or cell-radio network temporary identifier C-RNTI information of the user equipment; the uplink transmission information includes one or any combination of the following: at least one E-RAB The identifier, the E-RAB service quality parameter corresponding to the at least one E-RAB identifier, and the radio resource control context information, where the radio resource control context information includes: uplink radio resource specific configuration information and/or the user equipment C-RNTI information. A ninth aspect of the present invention provides a user equipment, including:

a receiver, configured to receive a handover command sent by the source base station, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched;

The processor is configured to perform downlink resource configuration according to the downlink resource configuration information, and maintain the uplink transmission with the source base station after the handover, and perform the downlink transmission by using the target base station after the handover; or configure according to the uplink resource The information is configured to perform uplink resource allocation, and after the handover, the downlink transmission with the source base station is maintained, and the user equipment performs the uplink transmission by using the target base station after handover;

With reference to the sixth aspect, in a first possible implementation manner of the ninth aspect, the handover command further includes an indication identifier, where the indication identifier is used to indicate that the user equipment and the target base station are newly used for a bearer Determining a downlink of the downlink transmission of the handover and retaining an uplink with the source base station; or, the indication identifier is used to indicate that the user equipment and the target base station are newly used to carry the to-be-switched Uplink of the uplink transmission and retaining a downlink with the source base station; or, the indication identifier is used to indicate that the user equipment and the target base station newly create a downlink transmission for carrying the to-be-switched The downlink or new uplink used to carry the uplink transmission to be handed over, and the uplink and downlink with the source base station are reserved.

With reference to the ninth aspect, or the first possible implementation manner of the ninth aspect, in the second possible implementation manner of the ninth aspect, the processor is further configured to: divide the PDCP entity into an uplink PDCP entity And a downlink PDCP entity, where the uplink PDCP entity corresponds to the second cell provided by the source base station, the downlink PDCP entity corresponds to the first cell provided by the target base station; and the RLC entity is divided into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponding to the second cell provided by the source base station, the downlink RLC entity corresponding to the first cell provided by the target base station, where the user equipment is connected to the first cell Performing the downlink transmission with the target base station, and performing the uplink transmission with the source base station via the second cell.

With reference to the second possible implementation manner of the ninth aspect, in a third possible implementation manner of the ninth aspect, the source base station is a micro base station, and the target base station is a macro base station. With reference to the ninth aspect, or the first possible implementation manner of the ninth aspect, in a fourth possible implementation manner of the ninth aspect, the processor is further configured to: divide the PDCP entity into an uplink PDCP entity And a downlink PDCP entity, where the uplink PDCP entity corresponds to the first cell provided by the target base station, the downlink PDCP entity corresponds to the second cell provided by the source base station; and the RLC entity is divided into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponding to the first cell provided by the target base station, the downlink RLC entity corresponding to the second cell provided by the source base station, where the user equipment is connected to the first cell Performing the uplink transmission with the target base station, and performing the downlink transmission with the source base station via the second cell.

With reference to the fourth possible implementation manner of the ninth aspect, in a fifth possible implementation manner of the ninth aspect, the source base station is a macro base station, and the target base station is a micro base station.

The handover method and device provided by the present invention, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, so that one of the uplink transmission and the downlink transmission of the user equipment is served by the source base station, and the other is the target base station. Cell services are provided to increase cell throughput and spectrum efficiency. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

1 is a flowchart of an embodiment of a handover method provided by the present invention;

2 is a flowchart of still another embodiment of a handover method provided by the present invention;

3 is a flowchart of another embodiment of a handover method provided by the present invention;

4 is a flowchart of another embodiment of a handover method provided by the present invention;

5 is a schematic diagram of a PDCP entity and an RLC AM entity provided by an example of the present invention; FIG. 6 is a schematic diagram of a communication scenario between a user equipment, a source base station, and a target base station in the embodiment shown in FIG.

7 is a schematic diagram of another communication scenario between a user equipment and a source base station and a target base station in the embodiment shown in FIG. 4;

FIG. 8 is a schematic diagram of a heterogeneous network scenario applied to an embodiment of the present invention; FIG. FIG. 9 is a flowchart of another embodiment of a handover method provided by the present invention; FIG.

10 is a schematic diagram of a communication scenario between a user equipment, a source base station, and a target base station in the embodiment shown in FIG.

11 is a schematic diagram of another communication scenario between a user equipment and a source base station and a target base station in the embodiment shown in FIG. 9;

12 is a schematic diagram of a network architecture of a handover method provided by the present invention;

FIG. 13 is a schematic diagram of another network architecture of the handover method provided by the present invention; FIG.

FIG. 14 is a schematic structural diagram of an embodiment of a base station according to the present invention; FIG.

15 is a schematic structural diagram of still another embodiment of a base station according to the present invention;

16 is a schematic structural diagram of an embodiment of a user equipment provided by the present invention;

17 is a schematic structural diagram of still another embodiment of a base station according to the present invention;

18 is a schematic structural diagram of still another embodiment of a base station according to the present invention;

FIG. 19 is a schematic structural diagram of still another embodiment of a user equipment according to the present invention;

FIG. 20 is a schematic structural diagram of an embodiment of a communication system provided by the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The techniques described herein can be used in a variety of communication systems, such as current 2G, 3G communication systems and next generation communication systems, such as Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA, Code Division Multiple). Access system, Time Division Multiple Access (TDMA) system, Wideband Code Division Multiple Access (WCDMA), Frequency Division Multiple Access (FDMA), Frequency Division Multiple Addressing (OFDM) system, Orthogonal Frequency OFDMA (Orthogonal Frequency-Division Multiple Access) system, single carrier FDMA (SC-FDMA) system, General Packet Radio Service (GPRS) system, Long Term Evolution (LTE) system, And other such communication systems. The user equipment involved in the present application may be a wireless terminal or a wired terminal, and the wireless terminal may be a device that provides voice and/or data connectivity to the user, a handheld device with wireless connectivity, or a wireless modem. Other processing equipment. The wireless terminal can communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and with a mobile terminal The computers, for example, can be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange language and/or data with the wireless access network. For example, Personal Communication Service (PCS), Cordless Phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), etc. . A wireless terminal may also be called a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, an Access Point, Remote Terminal, Access Terminal, User Terminal, User Agent, User Device, or User Equipment s

A base station (e.g., an access point) referred to in this application may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), this application is not limited.

Additionally, the terms "system" and "network" are used interchangeably herein. The term "and/or" in this context is merely an association that describes the associated object, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists separately, and both A and B exist, exist alone B these three situations. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

In various embodiments of the present invention, the handover operation involved is essentially an operation of separating the uplink transmission and the downlink transmission of the user equipment. Therefore, correspondingly, the handover request, handover response, Messages such as handover commands may be messages for requesting, responding, and commanding to perform uplink transmission and downlink transmission separation operations, respectively.

FIG. 1 is a flowchart of an embodiment of a handover method provided by the present invention, which may be performed by a source base station, as shown in FIG. 1, the method includes:

S101. The source base station determines to switch the downlink transmission of the user equipment to the first cell or switch the uplink transmission of the user equipment to the first cell.

The source base station sends a handover request to the target base station corresponding to the first cell, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment.

The source base station sends a handover command to the user equipment, where the handover command has the downlink resource configuration information corresponding to the downlink transmission to be switched or the uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user equipment remains after the handover. The uplink transmission of the source base station is performed by the target base station, or after the handover, the user equipment maintains downlink transmission with the source base station and performs uplink transmission via the target base station.

The downlink transmission information and the downlink resource configuration information include a handover type indication for indicating downlink transmission switching, or the uplink transmission information and the uplink resource configuration information include a handover type indication for indicating an uplink transmission handover.

In this embodiment, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, so that the user equipment serves the cell service provided by the source base station in the uplink transmission and the downlink transmission after the handover, and the other target The cell service provided by the base station implements uplink and downlink transmission separation of the user equipment, reduces interference caused by the base station to the user equipment, and improves cell throughput and spectrum efficiency.

Optionally, the first cell provided by the target base station overlaps with the coverage of the cell corresponding to the source base station that provides service to the user equipment before the handover; or, the frequency of the target base station overlaps with the source base station. When the coverage or frequency overlaps, and when the user equipment communicates with one base station separately, it will be interfered by another base station. The uplink and downlink transmissions are separated, that is, the user equipment and the one base station maintain the uplink transmission, and the other base station maintains the downlink transmission, which can effectively reduce the interference of the base station to the transmission under the premise of ensuring the user experience.

In an implementation scenario, the source base station may be a micro base station, and the micro base station may be a low power node (LPN), or a small base station, or a remote radio head (RRH). The current serving cell of the user equipment is a pico cell provided by the micro base station, The user equipment performs uplink communication and downlink communication with the micro cell. In this implementation scenario, the source base station may determine to switch the downlink transmission of the user equipment from the micro cell to the macro cell provided by the macro base station, that is, the target base station to be switched may be a macro base station, and the target cell to be switched is a macro base station. The first cell is provided, and the user equipment maintains uplink transmission with the micro cell.

Optionally, in a scenario where the source base station is a micro base station and the target base station is a macro base station, the first cell provided by the macro base station may cover a cell corresponding to the source base station that provides the service to the user equipment before the handover, or the macro base station and the micro base station The frequencies provided can be overlapped.

In another implementation scenario, the source base station may also be a macro base station, where the current service cell of the user equipment is a macro cell provided by the macro base station, and the user equipment performs uplink communication and downlink communication with the macro cell. In this implementation scenario, the source base station may determine to switch the uplink transmission of the user equipment from the macro cell to the pico cell provided by the micro base station, that is, the target base station to be switched may be a micro base station, and the handover may be performed. The target cell is the first cell provided by the micro base station, and the user equipment maintains the downlink transmission with the macro cell.

Optionally, in a scenario where the source base station is a macro base station and the target base station is a base station, the cell corresponding to the source base station that provides the service to the user equipment before the handover may cover the first cell provided by the micro base station, or the macro base station and the micro base station provide The frequencies can overlap.

After the source base station determines the target base station, the source base station may send a handover request to the target base station, where the handover request has downlink transmission information to be switched by the user equipment, so that the user equipment maintains the uplink transmission with the source base station and performs downlink transmission through the target base station after the handover; The handover request has uplink transmission information to be switched by the user equipment, so that after the handover, the user equipment maintains downlink transmission with the source base station and performs uplink transmission via the target base station.

In another implementation scenario, the micro base station may send downlink data to the user equipment at a lower power (for example, the source base station or the target base station), and the user equipment may transmit the macro data to the macro base station (for example, may be the target base station or source). The base station) transmits uplink data. Similarly, the interference of the base station to the user equipment can be reduced, thereby improving cell throughput and spectrum efficiency. It can be understood by those skilled in the art that the implementation scenario can be applied to a scene in which the user equipment is closer to the center of the micro base station than the center of the macro base station, and can be applied to other scenarios, and details are not described herein again.

In this embodiment, the downlink resource configuration information and the downlink transmission information included in the handover request include a handover type indication for indicating downlink transmission handover. Optionally, the downlink transmission information may further include one or any combination of the following: at least one evolved radio access bearer (Evolved) The radio access bearer (E-RAB) identifier, the E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and the radio resource control (RRC) context information, where the RRC context information may include the downlink radio resource. The dedicated configuration information and/or the cell-radio network temporary identification C-RNTI information of the user equipment.

Similarly, the uplink transmission information and the uplink resource configuration information included in the handover request include a handover type indication for indicating an uplink transmission handover. Optionally, the uplink transmission information may further include one or any combination of the following: at least one E-RAB identifier, at least one E-RAB identifier corresponding to the E-RAB quality of service parameter, and radio resource control context information, where the radio resource control The context may include: uplink radio resource specific configuration information and/or cell radio network Temporary Identifier (C-RNTI) information of the user equipment.

It can be understood that other radio resource configuration information may also be included in the handover request, which is not listed here.

As a possible implementation manner, after receiving the handover request sent by the source base station, the target base station may allocate, to the user equipment, downlink resource configuration information corresponding to the downlink transmission to be switched or uplink resource configuration information corresponding to the uplink transmission to be switched. In this implementation scenario, the target base station may carry the downlink resource configuration information corresponding to the downlink transmission to be switched or the uplink resource configuration information corresponding to the uplink transmission to be switched, which is allocated by the target base station to the user equipment, in the handover response sent to the source base station. The source base station may send a handover command to the user equipment, where the handover command may have downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched.

As another possible implementation, the source base station may send a radio resource allocation request message to the target base station in advance, where the allocation request message is used by the target base station to allocate the downlink resource corresponding to the downlink transmission to be switched to the user equipment in the first cell or The uplink resource corresponding to the uplink transmission to be switched. That is, the source base station may request in advance, in the first cell of the target base station, the user equipment to allocate the downlink resource corresponding to the downlink transmission to be switched or the uplink resource corresponding to the uplink transmission to be switched, without performing the handover procedure.

In this implementation scenario, after determining that the uplink or downlink transmission of the user equipment is switched to the target base station, the source base station may send a handover request to the target base station and send a handover command to the user equipment, where the handover request may indicate the target base station to use. The downlink resource corresponding to the downlink transmission or the uplink resource corresponding to the uplink transmission may be the same as the handover command, and is also used to indicate whether the uplink is allowed. The transmission and downlink transmission are separated.

Correspondingly, the source base station may further send a medium access control layer unit MAC CE to the user equipment, to indicate whether to allow uplink transmission and downlink transmission separation.

It should be noted that, for a user equipment with a slow moving speed, after the target base station allocates uplink resources or downlink resources to the user equipment in advance, the source base station may notify the user equipment to perform uplink transmission and downlink transmission separation by using a handover command; After the target base station allocates uplink resources or downlink resources to the user equipment in advance, the source base station may notify the user equipment to perform uplink transmission and downlink transmission separation by using the MAC CE, and the implementation manner and the handover request and handover are performed. The comparison of the command methods can reduce the switching delay.

Optionally, the downlink resource configuration information allocated by the target base station to the user equipment includes one or any combination of the following: signaling radio bearer SRB downlink configuration information, data radio bearer DRB downlink configuration information, media access control MAC downlink configuration information, Physical downlink shared channel PDSCH configuration information.

The SRB downlink configuration information includes one or any combination of the following: SRB identifier, radio link control (RLC) downlink configuration, logical channel identifier, and the like; DRB downlink configuration information includes an evolved packet system identifier (eps- Bearer Identity), DRB identifier, packet data '; packet data convergence protocol (PDCP) downlink configuration, radio link control (RLC) downlink configuration, logical channel identification.

The downlink data configuration protocol downlink configuration information includes one or any combination of the following: a drop timer configuration, a header compression protocol configuration, and whether the RLC acknowledged mode (RLC AM) needs to be sent during handover. PDCP status report, information such as the length of the PDCP sequence number when the radio link control is not confirmed mode (RLC unacknowledged mode, RLC UM).

The radio link control downlink configuration information includes one or any combination of the following: downlink RLC-AM configuration, downlink RLC-UM configuration, and the like. The downlink RLC-AM configuration includes one or any combination of the following: reordering timer configuration, RLC status reporting, prohibiting timer configuration, and the like. The downlink RLC-UM configuration includes one or any combination of the following: serial number length configuration, reorder timer configuration, and so on.

The MAC downlink configuration information includes one or any combination of the following: discontinuous reception (DRX) configuration, secondary cell deactivation timer configuration, and the like. The PDSCH configuration information includes one or any combination of the following: a reference signal power configuration, a reference signal per resource element power, and a PDSCH resource element power ratio configuration.

Similarly, the uplink resource configuration information allocated by the target base station to the user equipment includes one or any combination of the following: SRB uplink configuration information, DRB uplink configuration information, MAC uplink configuration information, and PUSCH configuration information.

The SRB uplink configuration information includes one or any combination of the following: SRB identifier, radio link control uplink configuration, logical channel identifier, logical channel uplink configuration, and the like; the DRB uplink configuration information includes one or any combination of the following: System bearer identifier (eps-bearer Identity), DRB identifier, packet data convergence protocol configuration uplink configuration, radio link control uplink configuration, logical channel identifier, logical channel uplink configuration and other information.

The packet data convergence protocol uplink configuration information includes one or any combination of the following: a drop timer configuration, a header compression protocol configuration, whether a radio link control acknowledgement mode (RLC AM) needs to send a PDCP status report during handover, Information such as the length of the PDCP sequence number when the radio link controls the non-acknowledgement mode (RLC UM).

The radio link control uplink configuration information includes one or any combination of the following:

Information such as RLC-AM configuration and uplink RLC-UM configuration. The uplink RLC-AM configuration includes one or any combination of the following: polling (re) retransmission timer configuration, polling PDU number configuration, polling byte number configuration, and RLC PDU maximum retransmission times configuration. The downlink RLC-UM configuration includes information such as the serial number length configuration.

The logical channel uplink configuration information includes one or any combination of the following: logical channel priority configuration, logical channel priority bit rate configuration, logical channel group, token bucket algorithm parameter configuration, and the like.

The MAC uplink configuration information includes one or any combination of the following: DRX configuration, uplink shared transport channel configuration, power headroom configuration, and secondary cell deactivation timer configuration.

The PUSCH configuration information includes one or any combination of the following: frequency hopping parameter configuration, whether high-order modulation configuration, uplink reference signal configuration, and the like are allowed.

The above SRB/DRB/MAC downlink/uplink configuration information, PDSCH/PUSCH configuration information, and the like are also applicable to the following embodiments unless otherwise specified.

The source base station sends a handover command to the user equipment, where the target base station allocates downlink resource configuration information corresponding to the downlink transmission to be switched to the user equipment or the uplink transmission corresponding to the handover Upstream resource configuration information. The downlink resource configuration information includes a handover type indication for indicating a downlink transmission handover, or the uplink resource configuration information includes a handover type indication for indicating an uplink transmission handover.

Optionally, the handover command sent by the source base station to the user equipment may further include an indication identifier, where the indication identifier may be used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be switched and retain the source base station. An uplink between the uplinks, or an uplink for carrying the uplink transmission to be handed over, and retaining a downlink with the source base station. In this scenario, when the handover is performed, the user equipment and the source base station communicate normally through the reserved uplink or downlink. After the handover is completed, the user equipment and the target base station communicate normally through the switched downlink or uplink.

Optionally, the foregoing indication identifier may be used to indicate that the user equipment and the target base station newly establish a downlink for carrying downlink transmissions to be switched and delete a downlink between the source base station, or used to carry uplink transmissions to be switched. Uplink and remove the uplink from the source base station. In the implementation scenario of deleting the downlink or uplink between the user equipment and the source base station, the uplink or downlink reserved by the source base station can continue to communicate.

Optionally, the foregoing indication identifier may be used to indicate that the user equipment and the target base station newly establish a downlink or an uplink for carrying downlink transmissions to be switched, and reserve downlink and uplink with the source base station. In the implementation scenario of the downlink and the uplink between the user equipment and the source base station, the uplink and downlink communications between the user equipment and the source base station may continue during the handover process, and the service delay in the handover process is reduced. Or business interruption time.

In the handover method provided by the embodiment of the present invention, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, so that the user equipment provides a cell service provided by the source base station in the uplink transmission and the downlink transmission after the handover, and A cell service provided by the target base station. For example, the user equipment may send uplink data to the micro base station at a lower power, and the macro base station may send downlink data to the user equipment with a stronger transmission power. For another example, when the user equipment is closer to the center of the micro base station, the micro base station sends downlink data to the user equipment with lower power, and the user equipment sends the uplink data to the macro base station with higher power. Thereby, the interference of the base station to the user equipment can be reduced, thereby improving the cell throughput and the spectrum efficiency.

This embodiment provides a method for switching uplink or downlink transmission of a user equipment to a target base station, so that uplink and downlink of the user equipment communicate with different base stations, and the method is also applicable to existing carrier types and new Carrier Type (NCT), new carrier class The type may or may not transmit a primary synchronization signal/secondary synchronization signal, etc., and may transmit an enhanced physical downlink control channel (E-PDCCH) on the NCT or perform cross-scheduling by other carriers through the PDCCH or the E-PDCCH. 2 is a flowchart of still another embodiment of a handover method according to the present invention. The difference in the previous embodiment is that the method can be performed by a target base station. As shown in FIG. 2, the method includes:

S201. The target base station receives a handover request sent by the source base station, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment.

S202. The target base station determines to allow the downlink transmission or the uplink transmission of the user equipment to be handed over to the first cell provided by the target base station.

S203. The target base station sends, to the source base station, the downlink resource configuration information corresponding to the downlink transmission to be switched and the uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user equipment maintains the uplink transmission with the source base station after the handover. Downlink transmission is performed via the target base station, or the user equipment maintains downlink transmission with the source base station and performs uplink transmission via the target base station after handover.

In an implementation scenario, the source base station may be a base station, and the target base station may be a macro base station. The handover request received by the target base station may have downlink transmission information to be switched by the user equipment, so that downlink transmission of the user equipment is switched by the micro base station. To the macro base station.

Optionally, the downlink transmission information may include one or any combination of the following: at least one E-RAB identifier, at least one E-RAB identifier corresponding to the E-RAB quality of service parameter, and radio resource control context information, where the radio resource control context The information may include: downlink radio resource specific configuration information and/or cell-radio network temporary identity C-RNTI information of the user equipment.

In another implementation scenario, the source base station may be a macro base station, and the target base station may be a base station. The handover request received by the target base station may have uplink transmission information to be switched by the user equipment, so that the uplink transmission of the user equipment is switched by the macro base station. To the micro base station.

Similarly, the uplink transmission information may include one or any combination of the following: at least one E-RAB identifier, at least one E-RAB identifier corresponding to the E-RAB quality of service parameter, and radio resource control context information, where the radio resource control context information Can include: Upstream radio resource specific configuration The cell-radio network temporary identification C-RNTI information of the information and/or user equipment.

In this embodiment, after receiving the handover request, the target base station may perform admission control to determine whether to allow downlink transmission or uplink transmission of the user equipment to be switched to the first cell provided by the target base station. If the target base station allows the downlink transmission or the uplink transmission of the user equipment to be handed over to the first cell provided by the target base station, the target base station may send a handover response to the source base station.

As a possible implementation manner, after the target base station determines that the downlink transmission or the uplink transmission of the user equipment is allowed to be switched to the first cell provided by the target base station, the downlink resource configuration information corresponding to the downlink transmission to be switched may be allocated to the user equipment or is to be switched. Uplink resource corresponding uplink resource configuration information. The target base station may carry the downlink resource configuration information corresponding to the downlink transmission to be switched and the uplink resource configuration information corresponding to the uplink transmission to be switched that the target base station allocates to the user equipment.

As another possible implementation manner, the source base station may send a radio resource allocation request message to the target base station in advance, where the target base station may allocate, in the first cell, the downlink resource corresponding to the downlink transmission to be switched in the first cell. Configuration information or uplink resource configuration information corresponding to the uplink transmission to be switched. In this implementation scenario, the target base station receives the handover request sent by the source base station to indicate whether to allow uplink transmission and downlink transmission separation.

Optionally, the downlink resource configuration information allocated by the target base station to the user equipment may include one or any combination of the following: SRB downlink configuration information, DRB downlink configuration information, MAC downlink configuration information, and PDSCH configuration information.

Similarly, the uplink resource configuration information allocated by the target base station to the user equipment may include one or any combination of the following: SRB uplink configuration information, DRB uplink configuration information, MAC uplink configuration information, and PUSCH configuration information.

In the handover method provided by the embodiment of the present invention, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, and the target base station may allow the uplink transmission or the downlink transmission of the user equipment to be switched to the target base station, thereby enabling the uplink transmission of the user equipment. One of the downlink transmissions is provided by the cell service provided by the source base station, and the other is provided by the target base station, thereby improving cell throughput and spectrum efficiency. FIG. 3 is a flowchart of another embodiment of a handover method according to the present invention. The method is different from the foregoing method embodiments. The method may be performed by a user equipment. As shown in FIG. 3, the method includes: The user equipment receives the handover command sent by the source base station, where the handover command has the downlink resource configuration information corresponding to the downlink transmission to be switched and the uplink resource configuration information corresponding to the uplink transmission to be switched.

The user equipment performs the downlink resource configuration according to the downlink resource configuration information, and maintains the uplink transmission with the source base station after the handover and performs downlink transmission through the target base station; or performs uplink resource configuration according to the uplink resource configuration information, and maintains the source and the base station after the handover. Downlink transmission and uplink transmission via the target base station.

In an implementation scenario, the source base station may be a micro base station, and the current serving cell of the user equipment is a micro cell provided by the micro base station, and the user equipment performs uplink communication and downlink communication with the micro cell. In this implementation scenario, the source base station may determine to switch the downlink transmission of the user equipment from the micro cell to the macro cell provided by the macro base station, that is, the target base station to be handed over may be a macro base station, and the target cell to be switched is the first provided by the macro base station. Community.

In another implementation scenario, the source base station may also be a macro base station, where the current service cell of the user equipment is a macro cell provided by the macro base station, and the user equipment performs uplink communication and downlink communication with the macro cell. In this implementation scenario, the source base station may determine to switch the uplink transmission of the user equipment from the macro cell to the micro cell provided by the micro base station, that is, the target base station to be handed over may be a micro base station, and the target cell to be switched is the first provided by the micro base station. Community.

In an implementation scenario, the user equipment may receive a handover command sent by the source base station, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated for the user equipment, to indicate that the user equipment switches the downlink transmission to Target cell.

In this implementation scenario, the user equipment may perform downlink resource configuration according to the downlink resource configuration information. Specifically, the user equipment may reset the downlink of the media access control MAC, reestablish the downlink of the packet data convergence protocol PDCP entity, and reconstruct The radio link controls the downlink of the RLC entity, and configures the downlink transmission of the PDCP entity and the downlink transmission of the RLC entity. Alternatively, the user equipment may also reset the downlink of the medium access control MAC, reestablish the downlink of the packet data convergence protocol PDCP entity, reconstruct the downlink of the radio link control RLC entity, and configure the uplink transmission and the downlink transmission of the PDCP entity. , and uplink transmission and downlink transmission of the RLC entity.

In this embodiment, the foregoing downlink operations for MAC, RLC, and PDCP can be performed. Separately for the downlink that needs to be handed over to the target base station. After the user equipment is configured with the uplink transmission of the PDCP entity and the RLC entity, if the uplink between the source and the base station is to be switched subsequently, the user equipment may directly enable the control by the MAC entity without passing through the RLC entity.

The downlink for resetting the MAC may include: stopping a timer configured for all MAC downlinks in operation, and clearing a buffer of all hybrid automatic repeat request (HQQ) processes (process) Each downlink HARQ process considers that the next received TB is the first TB, and if so, the temporary cell-radio network temporary identifier (temporary C-RNTI) is operated.

For the downlink of the reconstructed PDCP entity, the downlink data transmission and reconstruction process may be performed separately for the DRB mapped to the RLC-AM and the DRB and the SRB mapped to the RLC-UM.

For the downlink of the RLC entity to be reconstructed, the receiving end of the RLC UM entity and the RLC AM entity in the RLC reconstruction may perform corresponding operations.

The process of resetting the downlink of the MAC, reestablishing the downlink of the PDCP entity, and reconstructing the downlink of the RLC entity is applicable to the following embodiments.

Optionally, the handover command that is received by the user equipment may further include an indication identifier, where the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying downlink transmissions to be switched, and The uplink with the source base station is reserved. Thereby, the uplink communication between the user equipment and the source base station can be continued during the handover.

Further, the indication identifier may be further used to indicate that the user equipment and the target base station newly establish a downlink for carrying downlink transmissions to be switched, and reserve downlink and uplink with the source base station. road. Therefore, the downlink communication and the uplink communication between the user equipment and the source base station can be continued during the handover process, which reduces service delay or service interruption.

Optionally, the user equipment can divide the PDCP entity into an uplink PDCP entity and downlink.

The PDCP entity, the uplink PDCP entity corresponds to the second cell provided by the source base station, and the downlink PDCP entity corresponds to the first cell provided by the target base station. Similarly, the user equipment may further divide the RLC entity into an uplink RLC entity and a downlink RLC entity, where the uplink RLC entity corresponds to the second cell provided by the source base station, and the downlink RLC entity corresponds to the first cell provided by the target base station. The user equipment performs downlink transmission with the target base station via the first cell, and performs uplink transmission with the source base station via the second cell. Lose. Further, the source base station is a micro base station, and the target base station is a macro base station.

The user equipment can rebuild and configure the uplink PDCP entity, the downlink PDCP entity, the uplink RLC entity, and the downlink RLC entity respectively in the handover process by separating the uplink and downlink of the PDCP entity or the uplink and downlink of the RLC entity. Therefore, the user equipment does not need to rebuild and configure the entire PDCP entity and the RLC entity, and can continue to communicate with the uplink transmission or the downlink transmission without switching, thereby improving handover efficiency and flexibility. In this embodiment, the uplink PDCP entity and the downlink PDCP entity, the uplink RLC entity, and the downlink RLC entity may respectively correspond to an uplink entity and a downlink entity of the RLC unacknowledged mode.

Optionally, the user equipment may also not divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity. Specifically, the user equipment may correspond to the uplink transmission of the PDCP entity to the second cell provided by the source base station, and the downlink transmission of the PDCP entity to the first cell provided by the target base station. Similarly, the user equipment may not divide the RLC entity into an uplink RLC entity and a downlink RLC entity. Specifically, the user equipment may correspond to the uplink of the RLC entity to the second cell provided by the source base station, and the downlink transmission of the RLC entity to the first cell provided by the target base station. The user equipment performs downlink transmission with the target base station via the first cell, and performs uplink transmission with the source base station via the second cell. Further, the source base station is a micro base station, and the target base station is a macro base station. The uplink transmission of the PDCP entity or the RLC entity is corresponding to the target base station, or the uplink transmission of the PDCP entity or the RLC entity is corresponding to the source base station. In the handover process, the user equipment can also reconstruct and configure the uplink transmission or the downlink transmission separately. , reduce signaling overhead and implementation complexity.

In another implementation scenario, the user equipment receives the uplink resource configuration information corresponding to the uplink transmission to be switched allocated for the user equipment in the handover command sent by the source base station, to indicate that the user equipment switches the uplink transmission to the target cell.

In this implementation scenario, the user equipment may perform uplink resource configuration according to the uplink resource configuration information. Specifically, the user equipment may reset the uplink of the MAC, re-establish the uplink of the PDCP entity, and re-establish the radio link control RLC entity. On the uplink, the uplink transmission of the PDCP entity and the uplink transmission of the RLC entity can be configured to reconstruct the uplink of the PDCP entity. Alternatively, the user equipment may also reset the uplink of the MAC, re-establish the uplink of the PDCP entity, re-establish the uplink of the radio link control RLC entity, re-establish the uplink of the PDCP entity, and configure the uplink transmission and downlink transmission of the PDCP entity. And configuring the uplink and downlink transmissions of the RLC entity. The uplink for resetting the MAC may include: stopping a timer configured for all MAC uplinks in operation, considering that a time alignment timer expires, and setting a new data identifier for all uplink HARQ processes (new data identifier, NDI) is 0. If there is an ongoing random access procedure, the ongoing random access procedure is stopped, and if there is an allocated random access dedicated preamble, the allocated random access dedicated preamble is discarded, if there is already triggered The scheduling request process cancels the already triggered scheduling request process, and if there is a buffer status reporting process that has been triggered, cancels the buffer status reporting process that has been triggered, and if there is already triggered power headroom reporting process, the cancellation has already been triggered. The power headroom reporting process, if there is an allocated temporary cell - the wireless network temporary identity, the temporary cell - Temporary C-RNTI is translated.

For the uplink of the reconstructed PDCP entity, the DRB and the SRB mapped to the RLC-AM and the DRB and the SRB mapped to the RLC-UM are respectively performed according to the uplink data transmission and reconstruction process.

For the uplink of the reconstructed RLC entity, the descriptions related to the sending end of the RLC UM entity and the RLC AM entity in the RLC re-establishment respectively perform corresponding operations.

The above process of resetting the uplink of the MAC, reestablishing the uplink of the PDCP entity, and reconstructing the uplink of the RLC entity is applicable to the following embodiments.

Optionally, the handover command that is received by the user equipment may further include an indication identifier, where the indication identifier is used to indicate that the user equipment and the target base station newly establish an uplink for carrying uplink transmissions to be switched, and The downlink with the source base station is reserved. Thereby, the downlink communication between the user equipment and the source base station can be continued during the handover.

Further, the indication identifier may be further used to indicate that the user equipment and the target base station newly establish an uplink for carrying uplink transmissions to be switched, and reserve downlink and uplink with the source base station. road. Therefore, the downlink communication and the uplink communication between the user equipment and the source base station can be continued during the handover process, which reduces service delay or service interruption.

Optionally, the user equipment may further divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the first cell provided by the target base station, and the downlink PDCP entity corresponds to the second cell provided by the source base station. Similarly, the user equipment may further divide the RLC entity into an uplink RLC entity and a downlink RLC entity, where the uplink RLC entity corresponds to the first cell provided by the target base station, and the downlink RLC entity corresponds to the second cell provided by the source base station. Wherein, the user equipment The first cell performs uplink transmission with the target base station, and performs downlink transmission with the source base station via the second cell. Further, the source base station is a macro base station, and the target base station is a micro base station. Therefore, the uplink PDCP entity and the downlink PDCP entity, the uplink RLC entity, and the downlink RLC entity may be separately reconstructed and configured in the handover process; the entire PDCP entity and the RLC entity need not be reconstructed and configured, and the uplink transmission or downlink without handover may be performed. The transmission continues to communicate, improving switching efficiency and flexibility.

In the handover method provided by the embodiment of the present invention, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, so that one of the uplink transmission and the downlink transmission of the user equipment is served by the source base station, and the other is targeted by the target. The cell service provided by the base station, thereby improving cell throughput and spectrum efficiency. FIG. 4 is a flowchart of another embodiment of a handover method according to the present invention. As shown in FIG. 4, the embodiment provides a specific method for switching in a scenario where the source base station is a micro base station and the target base station is a macro base station. Process, the method includes:

S401. The UE sends a measurement report to the Kaiji.

S402. The micro base station determines, according to the measurement report, that the downlink transmission of the UE is switched from the micro base station to the first cell of the macro base station.

For example, the micro base station may receive power according to a reference signal of a common reference signal (CRS) or a channel-state information reference signal (CSI-RS) of the first cell included in the measurement report. The reference signal receiving power (RSRP) measurement result is greater than the RSRP measurement result of the CRS or CSI-RS of the second cell of the micro base station currently served by the UE, or when the measurement result of the first cell exceeds a certain threshold, determining the downlink of the UE The transmission is handed over from the micro base station to the first cell of the macro base station.

S403. The micro base station sends a handover request to the macro base station, where the handover request carries downlink transmission information. The downlink transmission information may include a handover type indication for indicating a downlink transmission handover.

Optionally, the downlink transmission information may further include one or any combination of the following: at least one E-RAB identifier, at least one E-RAB identifier corresponding to the E-RAB quality of service parameter, and radio resource control context information, where the radio resource control The context information may include downlink radio resource specific configuration information and/or cell-radio network temporary identity C-RNTI information of the user equipment.

It can be understood that the handover request may also have uplink radio resource dedicated configuration information, etc. Not here - enumeration.

5404. The macro base station performs a radio admission control (RAC) process, and allows the downlink transmission of the UE to be switched to the first cell provided by the macro base station.

Specifically, the above admission control process indicates that the macro base station confirms whether to allow handover. For example, when the load of the macro base station is high, the macro base station can reject the handover request. The admission control process described above occurs before random access. If the macro base station rejects the handover request, the source base station needs to select another base station to perform handover, and random access does not occur at the macro base station.

S405. The macro base station allocates downlink resources to the UE in the first cell.

In this embodiment, the foregoing first cell may be understood as a frequency band corresponding to the first cell. The foregoing downlink resource can be understood as a downlink resource corresponding to the first cell.

Specifically, the macro base station may allocate a C-RNTI to the UE, and configure a downlink resource according to the quality of service (QoS) parameter of each E-RAB. Alternatively, the macro base station may configure the downlink resource and the uplink resource according to the QoS parameter of the E-RAB, but the UE may use only the downlink resource configuration information.

The downlink resources allocated by the macro base station to the UE may include one or any combination of the following: SRB downlink configuration information, DRB downlink configuration information, MAC downlink configuration information, and PDSCH configuration information.

The signaling radio bearer (SRB) downlink configuration information may include one or any combination of the following: an SRB identifier, an RLC downlink configuration, a logical channel identifier configuration information, and the like. The DRB downlink configuration information may include one or any combination of the following: an evolved packet system bearer identifier, a DRB identifier, a PDCP downlink configuration, an RLC downlink configuration, a logical channel identifier configuration information, and the like. The media access control (MAC) downlink configuration information may include one or any combination of the following: discontinuous reception of configuration information, SCell deactivation of timer configuration information, and the like.

It can be understood that the downlink resources allocated by the macro base station to the UE may further include one or any combination of the following: Channel Quality Indicator (CQI) report configuration information, antenna information, and the like.

In addition, the macro base station may not configure the physical uplink control channel and the physical uplink shared channel resource, or the macro base station may configure but not use the physical uplink control channel and the physical uplink shared channel resource.

5406. The macro base station sends a handover response to the micro base station, where the handover response has downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the macro base station to the UE.

The handover response may also carry one or any combination of the following information: at least one E-RAB ID, at least one E-RAB corresponding to a downlink general packet radio service (GPRS) tunneling protocol port (DL GTP tunnel endpoint), Acer Stand to the transparent base station of the micro base station. The macro base station to the micro base station transparent container includes a handover command, that is, a radio resource connection reconfiguration message (RRC connection reconfiguration) including mobility control information, and a radio resource parameter that is required to be configured to the UE.

5407. The micro base station sends a handover command to the UE, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched.

The downlink resource configuration information may include a handover type indication for indicating a downlink transmission handover.

Optionally, the handover command may further include an indication identifier, where the indication identifier may be used to indicate that the user equipment and the macro base station newly establish a downlink for carrying the downlink transmission to be switched, and reserve the downlink and uplink with the micro base station. The indication identifier may also be used to indicate that the user equipment and the macro base station newly establish a downlink for carrying the downlink transmission to be switched and delete the downlink between the micro base station; or, the indication identifier may also be used for The user equipment and the macro base station are instructed to newly establish a downlink for carrying the downlink transmission to be handed over and reserve an uplink with the micro base station.

5408. The micro base station sends a packet data convergence protocol service data unit (PDCP SDU) to the macro base station, and the sequence number (SN) information is sent and the RLC layer is not received. Downstream PDCP SDU.

The sequence number information of the downlink PDCP SDU may include at least one downlink E-RAB PDCP sequence number information, which is used to indicate the sequence number that the macro base station will allocate to the downlink new PDCP SDU after the downlink handover.

S409: The UE performs downlink resource configuration according to the downlink resource configuration information.

The UE performs downlink resource configuration. For details, refer to the method embodiment corresponding to FIG. 3, which is not described herein.

In this embodiment, after receiving the handover command, the UE synchronizes with the macro base station in the downlink. For a specific resource configuration process, refer to the method embodiment corresponding to FIG. 3, and details are not described herein again.

As a possible implementation manner, the UE resets the downlink of the MAC, reestablishes the downlink of the PDCP entity, and reconstructs the downlink of the RLC entity. The downlink resource corresponding to the downlink transmission of the PDCP entity and the downlink transmission of the RLC entity are configured.

As another possible implementation manner, the UE resets the downlink of the MAC, reestablishes the downlink of the PDCP entity, and reconstructs the downlink of the RLC entity; and configures the uplink transmission and the downlink transmission of the PDCP entity. Corresponding downlink resources and uplink resources, and downlink resources and uplink resources corresponding to uplink transmission and downlink transmission of the RLC entity.

The indication identifier of the handover command sent by the micro base station to the UE in the S407 is used to indicate that the user equipment and the macro base station newly establish a downlink for carrying the downlink transmission to be switched and retain the downlink between the user equipment and the micro base station. In the scenario of the link and the uplink, the UE does not need to reset the MAC downlink, and keeps the downlink of the PDCP entity and the RLC entity for downlink transmission, that is, the PDCP entity and the RLC entity that perform uplink and downlink transmission with the micro base station. No need to re-establish and re-configure, only need to establish and configure the downlink resources corresponding to the downlink transmission between the PDCP entity and the RLC entity that are added to the macro base station, and configure the downlink transmission parameters of the MAC layer. The reconstruction and reconfiguration of the above PDCP entity and RLC entity involves reconstruction and reconfiguration of SRB and DRB. A schematic diagram of the UE interacting with the source base station and the target base station during handover may be as shown in FIG. 7.

In addition, the UE may also perform configuration such as a physical downlink shared channel.

Optionally, the user equipment may divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the second cell provided by the source base station, and the downlink PDCP entity corresponds to the first cell provided by the target base station.

Similarly, the user equipment may further divide the RLC entity into an uplink RLC entity and a downlink RLC entity, where the uplink RLC entity corresponds to the second cell provided by the source base station, and the downlink RLC entity corresponds to the first cell provided by the target base station.

Specifically, as shown in FIG. 5, the PDCP entity of the UE may be separated into an uplink PDCP entity and a downlink PDCP entity (corresponding to the second cell and the first cell, respectively), and the RLC AM entity of the UE may be separated into an uplink RLC AM entity and a downlink. The RLC AM entity is two parts (corresponding to the second cell and the first cell, respectively), and the RLC UM entity of the UE is separated into two parts, a downlink RLC UM entity and an uplink RLC UM entity (corresponding to the second cell and the first cell, respectively).

It should be noted that, in the process of performing the foregoing configuration, the uplink PDCP entity and the uplink RLC entity do not perform reconfiguration and reconfiguration, and the MAC uplink does not perform operations such as resetting. Therefore, the uplink communication process between the UE and the micro base station can be continued.

The execution order of S408 and S409 is in no particular order, and the two can also be performed simultaneously. S410. The UE sends a radio resource reconfiguration complete (RRC Connection Reconfiguration Complete) message to the micro base station.

Since the uplink remains at the source base station, the UE does not send radio resource reconfiguration to the target base station. The completion message is sent, and a radio resource reconfiguration complete message is sent to the source base station.

S411. The base station sends a downlink handover completion to the macro base station.

After the handover is successful, the source base station may determine whether to delete the downlink radio link from the source base station to the UE. If the source base station deletes the downlink radio link from the source base station to the UE, the schematic diagram of the UE interacting with the source base station and the target base station after the cell handover may be as shown in FIG. 6. If the source base station does not delete the downlink radio link from the source base station to the UE, The schematic diagram of the UE interacting with the source base station and the target base station after the cell handover may be as shown in FIG. 7.

The handover method provided in this embodiment may be applicable to various heterogeneous network scenarios. As shown in FIG. 8, an implementation scenario may be: a macro cell and a low power node (LPN) provided by the macro base station. The pico cell is covered by hotspots. The Pico cell can be configured with a cell range extension (CRE) or no CRE. When the CRE is configured, the bias configuration can be 6dB or 9dB or higher. The first cell provided by the macro base station and the second cell provided by the micro base station may have different physical cell identifiers (PCIs) or the same physical cell identifier. For UEs at the edge of the macro base station and the micro base station, enhanced interference coordination (elCIC) or CoMP technology can be used to reduce interference. When the UE having the RRC connection in the central area of the micro base station and the micro base station is in the RRC connection state, when moving from the central area of the micro base station to the macro base station to reach the CRE range of the micro base station, the micro base station may determine to switch the downlink transmission of the UE to the macro base station.

The handover method provided in this embodiment may also be applicable to a carrier aggregation (CA) scenario. For example, the macro base station and the micro base station provide two frequencies f1 and f2, respectively, and the macro base station and the micro base station jointly cover the area. The UE aggregates the f2 provided by the macro base station and the micro base station. The micro base station can configure CRE or not CRE in f2, and the offset configuration can be 6dB or 9dB or higher when configuring CRE.

In addition, it should be noted that, for the macro cell provided by the macro base station and the micro cell edge provided by the micro base station, the UE establishes a radio link with the macro cell in the downlink, and establishes a radio link in the uplink and the micro cell, in the downlink and the macro. Cell communication, communicating with the micro cell in the uplink. If the UE moves to the macro base station and moves out of the CRE range to enter the coverage of only the macro base station, the micro base station can switch the uplink transmission of the UE to the macro base station, so that both the uplink and the downlink of the UE communicate with the macro base station. The source base station is a micro base station, and the target base station for handover is a macro base station, and the UE may combine the downlink PDCP entity and the uplink PDCP entity into one bidirectional PDCP entity. Similarly, the downlink RLC AM entity and the uplink RLC may be used. The AM entities are combined into one bidirectional RLC AM entity. The process of switching the uplink transmission of the UE to the macro base station is similar to the process of S401-S411, and details are not described herein again.

In the handover method provided by the embodiment of the present invention, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, so that one of the uplink transmission and the downlink transmission of the user equipment is served by the source base station, and the other is targeted by the target. The cell service provided by the base station can enable the user equipment to send uplink data to the micro base station with a lower power, and the macro base station can send downlink data to the user equipment with a stronger transmission power, thereby improving cell throughput and spectrum efficiency. FIG. 9 is a flowchart of another embodiment of a handover method according to the present invention. As shown in FIG. 9, with respect to the foregoing method embodiments, the embodiment provides a scenario in which a source base station is a macro base station, and a target base station is a micro base station. The specific process of switching the method, the method includes:

S901: The UE sends a measurement report to the Acer account.

5902. The macro base station determines, according to the measurement report, that the uplink transmission of the UE is switched from the macro base station to the first cell of the micro base station.

For example, the macro base station may be based on the downlink path loss of the CRS or CSI-RS of the micro base station.

The downlink pathloss measurement result is greater than the downlink pathloss measurement result of the CRS or CSI-RS of the macro base station, or the downlink path loss measurement result of the CRS or CSI-RS of the micro base station exceeds a certain threshold, and is determined. The uplink transmission of the UE is switched from the micro base station to the first cell of the micro base station; the macro base station may be based on the power headroom (PHR) reported by the UE or the uplink path loss measurement or sounding reference signal of the UE. The downlink path loss of the UE is estimated by means of measurement or the like.

S903: The macro base station sends a handover request to the micro base station, where the handover request has uplink transmission information. The uplink transmission information may include a handover type indication for indicating an uplink transmission handover.

Optionally, the uplink transmission information may also include one or any combination of the following: at least one

The E-RAB identifier, the E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and the radio resource control context information, where the radio resource control context information may include: uplink radio resource specific configuration information and/or user equipment cell-wireless The network temporarily identifies the C-RNTI information.

It can be understood that the handover request may also have downlink radio resource specific configuration information and the like, which are not enumerated here. 5904. The micro base station performs an admission control process, and allows the uplink transmission of the UE to be switched to the first cell of the micro base station.

S905: The base station allocates uplink resources to the UE in the first cell.

Specifically, the micro base station may allocate a C-RNTI to the UE, and configure an uplink resource according to the QoS parameters of each E-RAB. Alternatively, the micro base station may configure the downlink resource and the uplink resource according to the QoS parameter of the E-RAB, but the UE may use only the uplink resource configuration information.

The uplink resources allocated by the micro base station to the UE may include one or any combination of the following: SRB uplink configuration information, DRB uplink configuration information, MAC uplink configuration information, and PDSCH configuration information.

The signaling radio bearer (SRB) uplink configuration information may include one or any combination of the following: an SRB identifier, an RLC uplink configuration, a logical channel identifier, and a logical channel uplink configuration information. The DRB uplink configuration information may include one or any combination of the following: an evolved packet system bearer identifier, a DRB identifier, a PDCP uplink configuration, an RLC uplink configuration, a logical channel identifier, a logical channel uplink configuration information, and the like. The MAC uplink configuration information may include one or any combination of the following: uplink shared transport channel (UL-SCH) configuration information, time adjustment timer configuration information, power headroom report configuration information, and the like.

It can be understood that the uplink resource allocated by the micro base station to the UE may further include one or any combination of the following: an uplink physical shared channel, an uplink physical control channel, an uplink power control parameter, a sounding reference signal parameter (SRS), an antenna information, and the like. .

In addition, the base station may not configure the physical downlink control channel and the physical downlink shared channel resource, or the micro base station may configure but not use the physical downlink control channel and the physical downlink shared channel resource.

5906. The micro base station sends a handover response to the macro base station, where the handover response has uplink resource configuration information corresponding to the uplink transmission to be switched allocated by the micro base station to the UE.

The handover response message may further carry one or any combination of the following information: at least one E-RAB ID, at least one E-RAB corresponding to an uplink general packet radio service (GPRS) tunneling protocol port (UL GTP tunnel endpoint), Micro base station to transparent base station transparent container (transparent contaiinsr).

The micro base station to the macro base station transparent container includes a handover command. For example, the radio resource connection reconfiguration message of the mobility control information includes a radio resource parameter that needs to be configured to the UE.

S907. The macro base station sends a handover command to the UE, where the handover command is sent. The uplink resource configuration information corresponding to the uplink transmission to be switched allocated by the micro base station to the UE is included. The uplink resource configuration information may include a handover type indication for indicating an uplink transmission handover.

Optionally, the handover command may further include an indication identifier, where the indication identifier may be used to indicate that the user equipment and the micro base station newly establish an uplink for carrying the uplink transmission to be switched, and reserve an uplink between the user equipment and the macro base station. And indicating that the user equipment and the macro base station newly establish an uplink for carrying the uplink transmission to be switched and deleting the uplink between the user equipment and the micro base station; or It can also be used to indicate that the user equipment and the micro base station newly establish an uplink for carrying the uplink transmission to be handed over and reserve the downlink between the macro base station and the macro base station.

S908: The macro base station sends the sequence number (SN) information of the uplink PDCP SDU to the micro base station and forwards the successfully received uplink PDCP SDU.

The sequence number information of the uplink PDCP SDU may include the sequence number of the first lost uplink PDCP SDU.

S909. The UE performs uplink resource configuration according to the uplink resource configuration information.

For details about the uplink resource configuration of the UE, refer to the description of the embodiment in FIG. 3, and details are not described herein again. Specifically: after receiving the handover command, the UE synchronizes with the micro base station in the uplink. For example, the uplink timing advance value may be directly sent to the UE through the random access procedure or the micro base station to achieve synchronization.

As a possible implementation manner, the UE resets the MAC uplink, reestablishes the uplink of the PDCP entity, and reconstructs the uplink of the RLC entity. The uplink resource corresponding to the uplink transmission of the PDCP entity and the uplink transmission of the RLC entity are configured.

As another possible implementation manner, the UE resets the MAC uplink, reestablishes the uplink of the PDCP entity, and reestablishes the uplink of the RLC entity; configures the uplink and downlink resources corresponding to the uplink and downlink transmissions of the PDCP entity, and the uplink of the RLC entity. Uplink resources and downlink resources corresponding to transmission and downlink transmission.

The indication identifier carried in the handover command of the macro base station transmitting the handover command to the UE in S907 is used to indicate that the user equipment and the micro base station newly establish an uplink for carrying the uplink transmission to be switched, and retain the between the user equipment and the macro base station. In the scenario of the downlink and the uplink, the UE does not need to reset the MAC uplink, and the PDCP entity of the original SRB and the DRB is uplinked and the RLC entity is uplinked, that is, the PDCP entity of the SRB and the DRB that performs uplink and downlink transmission with the macro base station. Uplink and RLC entity uplinks do not need to be re-established and reconfigured. Only new SRBs and DRBs need to be established and configured. The PDCP entity and the RLC entity uplink transmit corresponding uplink resources, and configure MAC layer uplink transmission parameters. A schematic diagram of the UE interacting with the source base station and the target base station during handover may be as shown in FIG.

In addition, the UE can also perform configuration such as a physical uplink shared channel.

Optionally, the user equipment may divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the downlink PDCP entity corresponds to the second cell provided by the source base station, and the uplink PDCP entity corresponds to the first cell provided by the target base station.

Similarly, the user equipment may further divide the RLC entity into an uplink RLC entity and a downlink RLC entity, where the downlink RLC entity corresponds to the second cell provided by the source base station, and the uplink RLC entity corresponds to the first cell provided by the target base station. It should be noted that, in the process of performing the foregoing configuration, the downlink downlink operation process between the UE and the micro base station can be performed because the downlink downlink PDCP entity and the downlink RLC entity do not perform reconstruction and reconfiguration, and the MAC downlink does not perform operations such as resetting. keep going.

Among them, the execution order of S908 and S909 is in no particular order, and the two can also be performed simultaneously.

5910. The UE sends a radio resource reconfiguration complete (RRC connection reconfiguration complete) message to the micro base station.

Since the uplink is handed over to the target base station, the UE transmits a radio resource reconfiguration complete message to the target base station.

5911. The macro base station sends an uplink handover completion to the micro base station.

The switching method provided in this embodiment is similar to the heterogeneous network scenario provided in the embodiment shown in FIG. 4, and is not described here. It should be noted that, in the foregoing embodiment provided in FIG. 1 to FIG. 9, the user equipment is in an RRC connected state (RRC_connected), and has an RRC connection with the source base station before the handover. Alternatively, the user equipment may be in an idle state (RRCJdle). In this implementation scenario, the user equipment may initiate a random access request to one of the macro base station and the micro base station to establish an RRC connection with the macro base station or the micro base station. For a UE that is located in the macro cell of the macro base station and the pico cell edge provided by the micro base station and is in the RRC Jdle state, the UE may select the macro cell or the pico cell to perform a random access procedure to enter the RRC_Connected state. If the UE first accesses the macro base station, the macro base station as the source base station may determine to switch the uplink transmission of the UE to the micro base station according to the measurement report of the UE, that is, perform the handover procedure of the embodiment shown in FIG. If the UE accesses the micro base station first, the micro base station as the source base station may determine to switch the downlink transmission of the UE to the UE according to the measurement report of the UE. The macro base station, i.e., performs the handover procedure of the embodiment shown in FIG.

In addition, it should be noted that, for the macro cell provided by the macro base station and the micro cell edge provided by the micro base station, the UE establishes a radio link with the macro cell in the downlink, and establishes a radio link in the uplink and the micro cell, in the downlink and the macro. Cell communication, communicating with the micro cell in the uplink. If the UE moves to the micro base station and moves out of the CRE range to enter the coverage of only the micro base station, the macro base station can switch the downlink transmission of the UE to the micro base station, so that both the uplink and the downlink of the UE communicate with the micro base station. The source base station is a macro base station, and the target base station for handover is a micro base station. The UE can combine the downlink PDCP entity and the uplink PDCP entity into one bidirectional PDCP entity. Similarly, the downlink RLC AM entity and the uplink RLC AM entity can be combined into one bidirectional RLC AM. entity. The process of switching the downlink transmission of the UE to the micro base station is similar to the process of S901-S911, and details are not described herein again.

After the handover is successful, the source base station may determine whether to delete the uplink radio link from the source base station to the UE. If the source base station deletes the uplink radio link from the source base station to the UE, the schematic diagram of the UE interacting with the source base station and the target base station after the cell handover may be as shown in FIG. 10, if the source base station does not delete the uplink radio link from the source base station to the UE, The schematic diagram of the UE interacting with the source base station and the target base station after the cell handover may be as shown in FIG. 11.

In the embodiment shown in FIG. 4 and FIG. 9, for the UE located in the macro cell provided by the macro base station and the micro cell edge provided by the micro base station, the UE establishes a radio link with the macro cell in the downlink, and establishes a wireless connection between the uplink and the micro cell. The link is in the downlink and communicates with the macro cell. In the implementation scenario of the uplink and the micro cell communication, the DRB of the user equipment can be carried by the macro base station and the micro base station on the S1-U interface with the core network SGW and the S1 bearer (S1 bearer) Establishing a mapping relationship, the evolved radio access bearer E-RAB is a bearer between the UE and the SGW, including a data radio bearer DRB between the UE and the base station, and an S1 bearer between the base station and the SGW, DRB and S1 bearer— - Correspondence, thereby establishing a data link between the UE and the SGW, as shown in FIG. The process of establishing the mapping is briefly described as follows: The mobility management entity (MME) and the eNB establish an E-RAB when the S1 interface is established, and include the E-RAB identification information. When the eNB configures the radio resource for the UE, the eNB adds the information of the DRB. The E-RAB identifier is included, and the DRB identifier is assigned to the DRB, so that a mapping relationship is established between the DRB and the S1 bearer. Alternatively, the mapping between the S1 bearer and the S1 bearer may be established on the S1-U interface with the core network SGW by using one of the macro base station and the micro base station, and the macro base station and the base station establish the foregoing by interacting with the E-RAB identifier and the DRB identification information. The mapping relationship is as shown in Figure 13. In the handover method provided by the embodiment of the present invention, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, so that one of the uplink transmission and the downlink transmission of the user equipment is served by the source base station, and the other is targeted by the target. The cell service provided by the base station can enable the user equipment to send uplink data to the micro base station with a lower power, and the macro base station can send downlink data to the user equipment with a stronger transmission power, thereby improving cell throughput and spectrum efficiency. FIG. 14 is a schematic structural diagram of an embodiment of a base station according to the present invention. The base station may perform a method according to any embodiment of the present invention, where the base station is, for example, a source base station or other similar device with cross-station coordination function; The base station includes: a determining unit 11 and a sending unit 12; the determining unit 11 is configured to determine to switch downlink transmission of the user equipment to the first cell or switch uplink transmission of the user equipment to the first cell;

The sending unit 12 is configured to send a handover request to the target base station corresponding to the first cell, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

The sending unit 12 is further configured to send, to the user equipment, a handover command, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated for the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user after the handover The device maintains uplink transmission with the base station and performs downlink transmission via the target base station, or the user equipment maintains downlink transmission with the base station after handover and performs uplink transmission via the target base station;

Optionally, the determining unit 11 may be specifically configured to: when the base station is a micro base station, and the target base station is a macro base station, determine to switch the downlink transmission of the user equipment to the first cell served by the macro base station; or, when the base station is the Acer base station When the target base station is a micro base station, it is determined to switch the uplink transmission of the user equipment to the first cell served by the micro base station.

Optionally, when the base station is a micro base station, and the target base station is a macro base station, the first cell covers a cell corresponding to the base station that provides the service to the user equipment before the handover, or the frequency provided by the macro base station and the micro base station overlap;

When the base station is a macro base station, and the target base station is a micro base station, the cell corresponding to the base station that provides the service to the user equipment before the handover covers the first cell, or the frequency provided by the macro base station and the micro base station overlap. Optionally, the sending unit 12 is further configured to: send a radio resource allocation request message to the target base station, where the allocation request message is used by the target base station to allocate, to the user equipment, the downlink resource corresponding to the downlink transmission to be switched in the first cell or to be switched. The uplink resource corresponding to the uplink transmission.

Optionally, the sending unit 12 is further configured to: send a media access control layer control unit MAC CE to the user equipment, where the MAC CE is used to indicate whether to allow uplink transmission and downlink transmission separation.

Optionally, the downlink transmission information further includes one or any combination of the following: at least one evolved radio access bearer E-RAB identifier, at least one E-RAB identifier corresponding E-RAB QoS parameter, and radio resource control context information. The radio resource control context information includes: downlink radio resource dedicated configuration information and/or cell-radio network temporary identifier C-RNTI information of the user terminal;

The uplink transmission information includes one or any combination of the following: at least one E-RAB identifier, an E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; where the radio resource control context information includes: Radio resource specific configuration information and/or C-RNTI information of the user terminal.

Optionally, the downlink resource configuration information that is allocated to the user equipment includes one or any combination of the following: signaling radio bearer SRB downlink configuration information, data radio bearer DRB downlink configuration information, media access control MAC downlink configuration information, and physical downlink The shared channel PDSCH configuration information includes: one or any combination of the following: SRB uplink configuration information, DRB uplink configuration information, MAC uplink configuration information, PUSCH configuration information.

Optionally, the handover command further includes an indication identifier; the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be handed over and reserve an uplink with the base station; or

The indication identifier is used to indicate that the user equipment and the target base station newly establish an uplink for carrying the uplink transmission to be handed over and reserve the downlink between the base station and the base station; or

The indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying downlink transmissions to be switched or newly establish an uplink for carrying uplink transmissions to be switched, and reserve uplink and downlink with the base station. link.

The base station provided in this embodiment is the execution device of the handover method provided by the present invention. For the specific process of performing the handover method, reference may be made to the related description in the method embodiment corresponding to FIG. 1 to FIG. 13 , and details are not described herein again. The base station provided by this embodiment is a source base station, and switches uplink transmission or downlink transmission of the user equipment to the target base station according to the measurement report reported by the user equipment, so that one of the uplink transmission and the downlink transmission of the user equipment is provided by the source base station. Cell server, another cell service provided by the target base station. For example, the user equipment may send uplink data to the micro base station at a lower power, and the macro base station may send downlink data to the user equipment with a stronger transmission power. For another example, when the UE is closer to the center of the micro-station, the micro-base station transmits downlink data to the user equipment with lower power, and the user equipment sends the uplink data to the macro base station with higher power. Thereby, the interference of the base station to the UE can be reduced, thereby improving the cell throughput and the spectrum efficiency.

This embodiment provides a method for switching uplink or downlink transmission of a user equipment to a target base station, so that uplink and downlink of the user equipment communicate with different base stations, and the method is applicable to existing carrier types and new carriers. Type (new carrier type, NCT), the new carrier type may or may not send the primary synchronization signal/secondary synchronization signal, etc., may transmit an enhanced physical downlink control channel (E-PDCCH) on the NCT or pass the PDCCH or E by other carriers. - PDCCH performs cross scheduling. FIG. 15 is a schematic structural diagram of still another embodiment of a base station according to the present invention. The base station may perform a method according to any embodiment of the present invention, where the base station is, for example, a target base station or other similar device with cross-station coordination function; As shown, the base station includes: a receiving unit 21, a determining unit 22, and a transmitting unit 23;

The receiving unit 21 is configured to receive a handover request message sent by the source base station, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

The determining unit 22 is configured to determine that the downlink transmission or the uplink transmission of the user equipment is allowed to be switched to the first cell provided by the base station;

The sending unit 23 is configured to send, to the source base station, the downlink resource configuration information corresponding to the downlink transmission to be switched allocated for the user equipment or the uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user equipment maintains the uplink with the source base station after the handover. The downlink transmission is performed by the base station, or the downlink transmission is performed by the user equipment and the uplink transmission is performed by the base station, and the downlink transmission information includes a handover type indication for indicating downlink transmission handover, or The transmission information includes a handover type indication for indicating an uplink transmission handover.

Optionally, when the source base station is a micro base station, and the base station is a macro base station, the first cell covers the switch before the handover. The cell corresponding to the source base station providing the service to the user equipment, or the frequency provided by the macro base station and the micro base station overlap;

When the source base station is a macro base station, and the base station is a micro base station, the cell corresponding to the source base station that provides the service to the user equipment before the handover covers the first cell, or the frequency provided by the macro base station and the micro base station overlap.

Optionally, the receiving unit 21 is further configured to receive a radio resource allocation request message sent by the source base station, where the radio resource allocation request message is used by the base station to allocate, to the user equipment, the downlink resource corresponding to the downlink transmission to be switched, or The uplink resource corresponding to the uplink transmission to be switched.

Optionally, the downlink transmission information further includes one or any combination of the following: at least one evolved radio access bearer E-RAB identifier, at least one E-RAB identifier corresponding E-RAB QoS parameter, and radio resource control context information. The radio resource control context information includes: downlink radio resource specific configuration information and/or cell-radio network temporary identifier C-RNTI information of the user equipment;

The uplink transmission information includes one or any combination of the following: at least one E-RAB identifier, an E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; where the radio resource control context information includes: Radio resource specific configuration information and/or C-RNTI information of the user equipment.

The base station provided in this embodiment is the execution device of the handover method provided by the present invention. For the specific process of performing the handover method, refer to the related description in the method embodiment corresponding to FIG. 1 to FIG. 13 , and details are not described herein again.

The base station provided in this embodiment is a target base station, and the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station according to the measurement report reported by the user equipment, and the target base station may allow the uplink transmission or the downlink transmission of the user equipment to be switched to the target base station. Therefore, one of the uplink and downlink transmissions of the user equipment is served by the cell provided by the source base station, and the other is provided by the target base station, thereby improving cell throughput and spectrum efficiency. Figure 16 is a schematic structural diagram of an embodiment of a user equipment provided by the present invention. As shown in Figure 16, the user equipment includes: a receiving unit 31 and a configuration unit 32;

The receiving unit 31 is configured to receive a handover command sent by the source base station, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched; The configuration unit 32 is configured to perform downlink resource configuration according to downlink resource configuration information, maintain uplink transmission with the source base station after the handover, and perform downlink transmission via the target base station, or perform uplink resource configuration according to the uplink resource configuration information, and maintain the source base station after the handover. Downlink transmission between each other and uplink transmission via the target base station;

Optionally, the handover command further includes an indication identifier; the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be handed over and reserve an uplink relationship with the source base station; or

The indication identifier is used to indicate that the user equipment and the target base station newly establish an uplink for carrying the uplink transmission to be handed over and reserve the downlink with the source base station; or

The indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be handed over or newly establish an uplink for carrying the uplink transmission to be handed over, and reserve the uplink between the source and the base station. Downlink.

Optionally, the user equipment further includes a dividing unit 33, configured to: divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the second cell provided by the source base station, and the downlink PDCP entity and the target base station provide Corresponding to the first cell; the RLC entity is divided into an uplink RLC entity and a downlink RLC entity, where the uplink RLC entity corresponds to the second cell provided by the source base station, and the downlink RLC entity corresponds to the first cell provided by the target base station;

The user equipment performs downlink transmission with the target base station via the first cell, and performs uplink transmission with the source base station via the second cell.

Optionally, the source base station is a micro base station, and the target base station is a macro base station.

Optionally, the dividing unit 33 is further configured to: divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the first cell provided by the target base station, and the downlink PDCP entity and the second cell provided by the source base station Corresponding

The RLC entity is divided into an uplink RLC entity and a downlink RLC entity, and the uplink RLC entity corresponds to the first cell provided by the target base station, and the downlink RLC entity corresponds to the second cell provided by the source base station;

The user equipment performs uplink transmission with the target base station via the first cell, and performs downlink transmission with the source base station via the second cell. Optionally, the source base station is a macro base station, and the target base station is a micro base station.

The user equipment provided in this embodiment is the execution device of the handover method provided by the present invention. For the specific process of performing the handover method, reference may be made to the related description in the method embodiment corresponding to FIG. 1 to FIG. 13 , and details are not described herein again.

In the user equipment provided by the embodiment, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station according to the measurement report reported by the user equipment, so that one of the uplink transmission and the downlink transmission of the user equipment is provided by the source base station. Cell service, another cell service provided by the target base station, thereby improving cell throughput and spectrum efficiency. FIG. 17 is a schematic structural diagram of still another embodiment of a base station according to the present invention. The base station may perform a method according to any embodiment of the present invention, where the base station is, for example, a source base station or other similar device with cross-station coordination function; As shown, the base station includes: a processor 41 and a transmitter 42;

The processor 41 is configured to determine to switch downlink transmission of the user equipment to the first cell or switch uplink transmission of the user equipment to the first cell;

The transmitter 42 is configured to send a handover request to the target base station corresponding to the first cell, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

The transmitter 42 is further configured to send a handover command to the user equipment, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated for the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched, so as to switch the user. The device maintains uplink transmission with the base station and performs downlink transmission via the target base station, or the user equipment maintains downlink transmission with the base station after handover and performs uplink transmission via the target base station;

Optionally, the processor 41 is specifically configured to: when the base station is a micro base station, and the target base station is a macro base station, determine to switch the downlink transmission of the user equipment to the first cell served by the macro base station; or, when the base station is the Acer base station When the target base station is a micro base station, it is determined to switch the uplink transmission of the user equipment to the first cell served by the micro base station.

Optionally, when the base station is a micro base station, and the target base station is a macro base station, the first cell covers a cell corresponding to the base station that provides the service to the user equipment before the handover, or the frequency provided by the macro base station and the micro base station is Overlapping

When the base station is a macro base station, and the target base station is a micro base station, the cell corresponding to the base station serving the user equipment before the handover covers the first cell, or the frequency provided by the macro base station and the micro base station overlap.

Optionally, the transmitter 42 is further configured to: send a radio resource allocation request message to the target base station, where the allocation request message is used by the target base station to allocate, to the user equipment, the downlink resource corresponding to the downlink transmission to be switched in the first cell or to be switched. The uplink resource corresponding to the uplink transmission.

Optionally, the transmitter 42 is further configured to: send a media access control layer control unit MAC CE to the user equipment, where the MAC CE is used to indicate whether to allow uplink transmission and downlink transmission separation.

Optionally, the handover command further includes an indication identifier, where the indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying the downlink transmission to be handed over and reserve an uplink with the base station; or

The indication identifier is used to indicate that the user equipment and the target base station newly establish a downlink for carrying downlink transmissions to be switched or newly establish an uplink for carrying uplink transmissions to be switched, and reserve uplink and downlink with the base station. link. The base station provided in this embodiment is the execution device of the handover method provided by the present invention. For the specific process of performing the handover method, refer to the related description in the method embodiment corresponding to FIG. 1 to FIG. 13 , and details are not described herein again.

The base station provided by this embodiment is a source base station, and switches uplink transmission or downlink transmission of the user equipment to the target base station according to the measurement report reported by the user equipment, so that one of the uplink transmission and the downlink transmission of the user equipment is provided by the source base station. The cell server, another cell service provided by the target base station, improves cell throughput and spectral efficiency. This embodiment provides a method for switching uplink or downlink transmission of a user equipment to a target base station, so that uplink and downlink of the user equipment communicate with different base stations, and the method is applicable to existing carrier types and new carriers. Type (New Carrier Type, NCT), the new carrier type may or may not send the primary synchronization signal/secondary synchronization signal, etc., may transmit an enhanced physical downlink control channel (E-PDCCH) on the NCT or pass PDCCH or E from other carriers. - PDCCH performs cross scheduling. FIG. 18 is a schematic structural diagram of still another embodiment of a base station according to the present invention. The base station may perform a method according to any embodiment of the present invention, where the base station is, for example, a target base station or other similar device having cross-station coordination function; The base station includes: a receiver 51, a processor 52, and a transmitter 53;

The receiver 51 is configured to receive a handover request message sent by the source base station, where the handover request has downlink transmission information or uplink transmission information to be switched by the user equipment;

The processor 52 is configured to determine that the downlink transmission or the uplink transmission of the user equipment is allowed to be switched to the first cell provided by the base station;

The transmitter 53 is configured to send, to the source base station, the downlink resource configuration information corresponding to the downlink transmission to be switched allocated for the user equipment or the uplink resource configuration information corresponding to the uplink transmission to be switched, so that the user equipment maintains the uplink with the source base station after the handover. Transmitting and performing downlink transmission via the base station, or so that the user equipment maintains downlink transmission with the source base station after handover and performs uplink transmission via the base station;

Optionally, when the source base station is a micro base station, and the base station is a macro base station, the first cell covers a cell corresponding to the source base station that provides the service to the user equipment before the handover, or the frequency provided by the macro base station and the micro base station overlap; When the source base station is a macro base station, and the base station is a micro base station, the cell corresponding to the source base station that provides the service to the user equipment before the handover covers the first cell, or the frequency provided by the macro base station and the micro base station overlap.

Optionally, the receiver 51 is further configured to: receive a radio resource allocation request message sent by the source base station, where the radio resource allocation request message is used by the base station to allocate, to the user equipment, the downlink resource corresponding to the downlink transmission to be switched, or The uplink resource corresponding to the uplink transmission to be switched.

The base station provided in this embodiment is a target base station, and the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station according to the measurement report reported by the user equipment, and the target base station may allow the uplink transmission or the downlink transmission of the user equipment to be switched to the target base station. Therefore, one of the uplink and downlink transmissions of the user equipment is served by the cell provided by the source base station, and the other is provided by the target base station, thereby improving cell throughput and spectrum efficiency. FIG. 19 is a schematic structural diagram of still another embodiment of a user equipment according to the present invention. As shown in FIG. 19, the user equipment includes: a receiver 61 and a processor 62;

The receiver 61 is configured to receive a handover command sent by the source base station, where the handover command has downlink resource configuration information corresponding to the downlink transmission to be switched allocated by the user equipment or uplink resource configuration information corresponding to the uplink transmission to be switched;

The processor 62 is configured to perform downlink resource configuration according to downlink resource configuration information, maintain uplink transmission with the source base station after the handover, and perform downlink transmission via the target base station; or Perform uplink resource configuration, maintain downlink transmission with the source base station after handover, and perform uplink transmission via the target base station;

Optionally, the processor 62 is further configured to: divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the second cell provided by the source base station, and the downlink PDCP entity corresponds to the first cell provided by the target base station The user equipment divides the RLC entity into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponds to the second cell provided by the source base station, and the downlink RLC entity corresponds to the first cell provided by the target base station;

Optionally, the source base station is a base station, and the target base station is a macro base station.

Optionally, the processor 62 is further configured to: divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the first cell provided by the target base station, and the downlink PDCP entity corresponds to the second cell provided by the source base station ;

The user equipment performs uplink transmission with the target base station via the first cell, and performs downlink transmission with the source base station via the second cell.

The user equipment provided in this embodiment is an execution device of the handover method provided by the present invention, and the implementation thereof For the specific process of the line switching method, refer to the related description in the method embodiment corresponding to FIG. 1 to FIG. 13 , and details are not described again.

In the user equipment provided by the embodiment, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station according to the measurement report reported by the user equipment, so that one of the uplink transmission and the downlink transmission of the user equipment is provided by the source base station. Cell service, another cell service provided by the target base station, thereby improving cell throughput and spectrum efficiency. FIG. 20 is a schematic structural diagram of an embodiment of a communication system according to the present invention. As shown in FIG. 20, the communication system includes:

a source base station 71 in any of the above embodiments; and

The target base station 72 in any of the above embodiments.

For the operations performed by the source base station, refer to the operations performed by the source base station in the foregoing method embodiment or the device embodiment. The action performed by the target base station may refer to the action performed by the target base station in the foregoing method embodiment or the device embodiment. I will not repeat them here.

In the communication system provided by the embodiment, the source base station switches the uplink transmission or the downlink transmission of the user equipment to the target base station, and the target base station may allow the uplink transmission or the downlink transmission of the user equipment to be switched to the target base station, thereby enabling the uplink and downlink of the user equipment. Communicate with different base stations separately to improve throughput and spectrum efficiency. It will be apparent to those skilled in the art that, for convenience and brevity of description, only the division of each functional unit described above is exemplified. In practical applications, the above-mentioned function assignment can be completed by different functional units as needed. The internal structure of the device is divided into different functional units to perform all or part of the functions described above. For the specific working process of the system, the device and the unit described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit or unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed. Alternatively, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interface, device or unit. The coupling or communication connection can be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software function unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program code. .

The above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

Rights request

1. A switching method, characterized by including:

The source base station sends a handover request to the target base station corresponding to the first cell, where the handover request contains downlink transmission information or uplink transmission information to be switched by the user equipment;

The source base station sends a switching command to the user equipment, where the switching command has downlink resource configuration information corresponding to the downlink transmission to be switched or uplink resource configuration information corresponding to the uplink transmission to be switched allocated to the user equipment, so that After the handover, the user equipment maintains the uplink transmission with the source base station and performs the downlink transmission via the target base station, or after the handover, the user equipment maintains the downlink transmission with the source base station and performs the downlink transmission via the target base station. The target base station performs the uplink transmission;

Wherein, the downlink transmission information and the downlink resource configuration information include a switching type indication for instructing downlink transmission switching, or, the uplink transmission information and the uplink resource configuration information include a switching type indication for instructing uplink transmission switching. Switch type indication.

2. The method according to claim 1, characterized in that:

The source base station determines to switch the downlink transmission of the user equipment to the first cell, specifically including: when the source base station is a micro base station and the target base station is a macro base station, the micro base station determines to switch the user equipment to the first cell. Switch the downlink transmission to the first cell served by the macro base station; or,

The source base station determines to switch the uplink transmission of the user equipment to the first cell, specifically including: when the source base station is a macro base station and the target base station is a micro base station, the macro base station determines to switch the user equipment to the first cell. The uplink transmission is switched to the first cell served by the micro base station.

3. The method according to claim 1 or 2, characterized in that:

The coverage of the first cell overlaps with the cell corresponding to the source base station that provided services to the user equipment before handover; or,

The frequencies of the target base station and the source base station overlap.

4. The method according to any one of claims 1-3, characterized in that, before the source base station sends a handover request message to the target base station, it further includes:

The source base station sends a wireless resource allocation request message to the target base station, and the allocation request The message is used by the target base station to allocate downlink resources corresponding to the downlink transmission to be switched or uplink resources corresponding to the uplink transmission to be switched to the user equipment in the first cell.

5. The method according to any one of claims 1 to 4, further comprising: the source base station sending a media access control layer control element MAC CE to the user equipment, the MAC CE being used to indicate Whether to allow separation of uplink transmission and downlink transmission.

6. The method according to any one of claims 1 to 5, characterized in that:

The downlink transmission information also includes one or any combination of the following: at least one evolved radio access bearer E-RAB identity, E-RAB quality of service parameters corresponding to the at least one E-RAB identity, and radio resource control context information. ; Wherein, the radio resource control context information includes: downlink radio resource dedicated configuration information and/or cell-radio network temporary identity C-RNTI information of the user equipment;

The uplink transmission information includes one or any combination of the following: at least one E-RAB identifier, the E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; wherein, the radio resource The control context information includes: uplink radio resource dedicated configuration information and/or C-RNTI information of the user equipment.

7. The method according to any one of claims 1-6, characterized in that:

The downlink resource configuration information allocated to the user equipment includes one or any combination of the following: signaling radio bearer SRB downlink configuration information, data radio bearer DRB downlink configuration information, media access control MAC downlink configuration information, physical downlink Shared channel PDSCH configuration information; The uplink resource configuration information allocated to the user equipment includes one or any combination of the following: SRB uplink configuration information, DRB uplink configuration information, MAC uplink configuration information, and PUSCH configuration information.

8. The method according to any one of claims 1-7, characterized in that:

The switching command also includes an indication mark;

The indication identifier is used to instruct the user equipment and the target base station to create a new downlink for carrying the downlink transmission to be switched and reserve an uplink with the source base station; or

The indication identifier is used to instruct the user equipment and the target base station to create a new uplink for carrying the uplink transmission to be switched and reserve a downlink with the source base station; or, the indication The identifier is used to instruct the user equipment and the target base station to create a downlink for carrying the downlink transmission to be switched or to create an uplink for carrying the uplink transmission to be switched. link, and retains the uplink and downlink with the source base station.

9. A switching method, characterized by including:

The target base station receives a handover request sent by the source base station, where the handover request contains downlink transmission information or uplink transmission information to be switched by the user equipment;

The target base station determines to allow the downlink transmission or uplink transmission of the user equipment to be switched to the first cell provided by the target base station;

The target base station sends to the source base station the downlink resource configuration information corresponding to the downlink transmission to be switched or the uplink resource configuration information corresponding to the uplink transmission to be switched allocated to the user equipment, so that the user equipment remains connected after the switch. The uplink transmission of the source base station and the downlink transmission via the target base station, or so that after the handover, the user equipment maintains the downlink transmission with the source base station and performs the downlink transmission via the target base station. Uplink transmission;

Wherein, the downlink transmission information includes a switching type indication for instructing downlink transmission switching, or the uplink transmission information includes a switching type indication for instructing uplink transmission switching.

10. The method according to claim 9, characterized in that the target base station determines to allow the downlink transmission of the user equipment to be switched to the first cell provided by the target base station, specifically including: when the source base station is a micro Base station, when the target base station is a macro base station, the target base station determines to allow the downlink transmission of the user equipment to be switched to the first cell provided by the target base station;

or,

The target base station determines to allow the user equipment's uplink transmission to be switched to the first cell provided by the target base station, specifically including:

When the source base station is a macro base station and the target base station is a micro base station, the target base station determines to allow the uplink transmission of the user equipment to be switched to the first cell provided by the target base station.

11. The method according to claim 9 or 10, characterized in that, before the target base station receives the handover request sent by the source base station, it further includes:

The target base station receives the radio resource allocation request message sent by the source base station. The radio resource allocation request message is used by the target base station to allocate the downlink transmission corresponding to the to-be-switched downlink transmission to the user equipment in the first cell. Downlink resources or uplink resources corresponding to the uplink transmission to be switched.

12. The method according to any one of claims 9-11, characterized in that the downlink transmission information also includes one or any combination of the following: at least one evolved radio access bearer E-RAB standard identification, E-RAB service quality parameters corresponding to the at least one E-RAB identifier, and radio resource control context information; wherein the radio resource control context information includes: downlink radio resource dedicated configuration information and/or the user equipment's Cell-radio network temporary identity C-RNTI information;

13. A switching method, characterized by including:

The user equipment receives a switching command sent by the source base station, where the switching command has downlink resource configuration information corresponding to the downlink transmission to be switched or uplink resource configuration information corresponding to the uplink transmission to be switched allocated to the user equipment;

The user equipment performs downlink resource configuration according to the downlink resource configuration information, maintains the uplink transmission with the source base station after handover and performs the downlink transmission via the target base station; or performs uplink resource configuration according to the uplink resource configuration information. configured to maintain the downlink transmission with the source base station after handover and perform the uplink transmission via the target base station;

Wherein, the downlink resource configuration information includes a switching type indication for instructing downlink transmission switching, or the uplink resource configuration information includes a switching type indication for instructing uplink transmission switching.

14. The method according to claim 13, characterized in that: the switching command received by the user equipment further includes an indication identifier;

The indication identifier is used to instruct the user equipment and the target base station to create a new uplink for carrying the uplink transmission to be switched and reserve a downlink with the source base station; or, the indication The identifier is used to instruct the user equipment and the target base station to create a downlink for carrying the downlink transmission to be switched or to create an uplink for carrying the uplink transmission to be switched, and is reserved with the Uplink and downlink between source base stations.

15. The method according to claim 13 or 14, characterized in that, further comprising: the user equipment divides the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, and the uplink PDCP entity and the source base station provide The second cell corresponds to, the downlink The PDCP entity corresponds to the first cell provided by the target base station;

The user equipment divides the RLC entity into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponds to the second cell provided by the source base station, and the downlink RLC entity corresponds to the first cell provided by the target base station. Community correspondence;

Wherein, the user equipment performs the downlink transmission with the target base station via the first cell, and performs the uplink transmission with the source base station via the second cell.

16. The method according to claim 15, characterized in that:

The source base station is a micro base station, and the target base station is a macro base station.

17. The method according to claim 13 or 14, further comprising: the user equipment divides the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, and the uplink PDCP entity and the target base station provide corresponds to the first cell, and the downlink PDCP entity corresponds to the second cell provided by the source base station;

The user equipment divides the RLC entity into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponds to the first cell provided by the target base station, and the downlink RLC entity corresponds to the second cell provided by the source base station. Community correspondence;

Wherein, the user equipment performs the uplink transmission with the target base station via the first cell, and performs the downlink transmission with the source base station via the second cell.

18. The method according to claim 17, characterized in that:

The source base station is a macro base station, and the target base station is a micro base station.

19. A base station, characterized by including:

Determining unit, used to determine to switch the downlink transmission of the user equipment to the first cell or to switch the uplink transmission of the user equipment to the first cell;

A sending unit, configured to send a handover request to the target base station corresponding to the first cell, where the handover request contains downlink transmission information or uplink transmission information to be switched by the user equipment;

The sending unit is also configured to send a switching command to the user equipment, where the switching command has downlink resource configuration information corresponding to the downlink transmission to be switched or uplink resources corresponding to the uplink transmission to be switched allocated to the user equipment. Configure information so that after the handover, the user equipment maintains the uplink transmission with the base station and performs the downlink transmission via the target base station, or after the handover, the user equipment maintains the downlink transmission with the base station. and perform the uplink transmission via the target base station; Wherein, the downlink transmission information and the downlink resource configuration information include a switching type indication for instructing downlink transmission switching, or, the uplink transmission information and the uplink resource configuration information include a switching type indication for instructing uplink transmission switching. Switch type indication.

20. The base station according to claim 19, characterized in that the determining unit is specifically used to:

When the base station is a micro base station and the target base station is a macro base station, determine to switch the downlink transmission of the user equipment to the first cell provided by the macro base station; or,

When the base station is a macro base station and the target base station is a micro base station, it is determined to switch the uplink transmission of the user equipment to the first cell provided by the micro base station.

21. The base station according to claim 19 or 20, characterized in that:

The coverage of the first cell overlaps with that of the cell corresponding to the base station that provided services to the user equipment before handover; or,

The frequencies of the base station and the target base station overlap.

22. The base station according to any one of claims 19-21, characterized in that:

The sending unit is also configured to: send a radio resource allocation request message to the target base station, where the allocation request message is used by the target base station to allocate the downlink transmission correspondence to be switched to the user equipment in the first cell. The downlink resources or the uplink resources corresponding to the uplink transmission to be switched.

23. The base station according to any one of claims 19-22, characterized in that:

The sending unit is also configured to: send a media access control layer control unit MAC CE to the user equipment, where the MAC CE is used to indicate whether to allow separation of uplink transmission and downlink transmission.

24. The base station according to any one of claims 19-23, characterized in that:

The downlink transmission information also includes one or any combination of the following: at least one evolved radio access bearer E-RAB identity, E-RAB quality of service parameters corresponding to the at least one E-RAB identity, and radio resource control context information. ; Wherein, the radio resource control context information includes: downlink radio resource dedicated configuration information and/or cell-radio network temporary identity C-RNTI information of the user terminal;

The uplink transmission information includes one or any combination of the following: at least one E-RAB identifier, the E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; wherein, the radio resource The control context information includes: uplink radio resource dedicated configuration information and/or C-RNTI information of the user terminal.

25. The base station according to any one of claims 19 to 24, characterized in that: the downlink resource configuration information allocated to the user equipment includes one or any combination of the following: Signaling radio bearer SRB downlink configuration information , data radio bearer DRB downlink configuration information, media access control MAC downlink configuration information, physical downlink shared channel PDSCH configuration information; The uplink resource configuration information allocated to the user equipment includes one or any combination of the following: SRB uplink Configuration information, DRB uplink configuration information, MAC uplink configuration information, PUSCH configuration information.

26. The base station according to any one of claims 19-25, characterized in that:

The switching command also includes an indication mark;

The indication identifier is used to instruct the user equipment and the target base station to create a new downlink for carrying the downlink transmission to be switched and reserve the uplink with the base station; or

The indication identifier is used to instruct the user equipment and the target base station to create a new uplink for carrying the uplink transmission to be switched and reserve a downlink with the base station; or,

The indication mark is used to instruct the user equipment and the target base station to create a new downlink for carrying the downlink transmission to be switched or to create an uplink for carrying the uplink transmission to be switched, and retain it. Uplink and downlink to and from the base station

27. A base station, characterized by including:

A receiving unit, configured to receive a handover request message sent by the source base station, where the handover request contains downlink transmission information or uplink transmission information to be switched by the user equipment;

Determining unit, configured to determine to allow the downlink transmission or uplink transmission of the user equipment to be switched to the first cell provided by the base station;

A sending unit, configured to send the downlink resource configuration information corresponding to the downlink transmission to be switched or the uplink resource configuration information corresponding to the uplink transmission to be switched allocated to the user equipment to the source base station, so that the user equipment maintains the The uplink transmission with the source base station and the downlink transmission via the base station, or so that after the handover, the user equipment maintains the downlink transmission with the source base station and performs the uplink via the base station transmission; transmission

28. The base station according to claim 27, characterized in that, the determining unit, specifically Used for:

When the source base station is a micro base station and the base station is a macro base station, it is determined to allow the downlink transmission of the user equipment to be switched to the first cell provided by the base station; or,

When the source base station is a macro base station and the base station is a micro base station, it is determined to allow the uplink transmission of the user equipment to be switched to the first cell provided by the base station.

29. The base station according to claim 27 or 28, characterized in that:

The receiving unit is also configured to receive a radio resource allocation request message sent by the source base station. The radio resource allocation request message is used by the base station to allocate downlink to be switched to the user equipment in the first cell. Downlink resources corresponding to the transmission or uplink resources corresponding to the uplink transmission to be switched.

30. The base station according to any one of claims 27-29, characterized in that:

31. A user equipment, characterized by: including:

A receiving unit, configured to receive a switching command sent by the source base station, where the switching command has downlink resource configuration information corresponding to the downlink transmission to be switched or uplink resource configuration information corresponding to the uplink transmission to be switched allocated to the user equipment;

A configuration unit configured to configure downlink resources according to the downlink resource configuration information, and after the handover, the user equipment maintains the uplink transmission with the source base station and performs the downlink transmission via the target base station; or according to the uplink resources The configuration information configures uplink resources, and after the handover, the user equipment maintains the downlink transmission with the source base station and performs the uplink transmission via the target base station;

Wherein, the downlink resource configuration information includes a switching class used to indicate downlink transmission switching. Type indication, or, the uplink resource configuration information includes a switching type indication used to indicate uplink transmission switching.

32. The user equipment according to claim 31, characterized in that:

The switching command also includes an indication mark;

33. The user equipment according to claim 31 or 32, further comprising a dividing unit for:

The PDCP entity is divided into an uplink PDCP entity and a downlink PDCP entity, the uplink PDCP entity corresponds to the second cell provided by the source base station, and the downlink PDCP entity corresponds to the first cell provided by the target base station;

Divide the RLC entity into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponds to the second cell provided by the source base station, and the downlink RLC entity corresponds to the first cell provided by the target base station;

34. The user equipment according to claim 33, wherein the source base station is a micro base station, and the target base station is a macro base station.

35. The user equipment according to claim 31 or 32, further comprising a dividing unit for:

Divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the first cell provided by the target base station, and the downlink PDCP entity corresponds to the second cell provided by the source base station;

The RLC entity is divided into an uplink RLC entity and a downlink RLC entity. The uplink RLC entity corresponds to the first cell provided by the target base station, and the downlink RLC entity corresponds to the source base station. The second cell correspondence provided;

36. The user equipment according to claim 35, wherein the source base station is a macro base station, and the target base station is a micro base station.

37. A base station, characterized by including:

A processor, configured to determine to switch the downlink transmission of the user equipment to the first cell or to switch the uplink transmission of the user equipment to the first cell;

A transmitter, configured to send a handover request to the target base station corresponding to the first cell, where the handover request contains downlink transmission information or uplink transmission information to be switched by the user equipment;

The transmitter is further configured to send a switching command to the user equipment, where the switching command has downlink resource configuration information corresponding to the downlink transmission to be switched or uplink resources corresponding to the uplink transmission to be switched allocated to the user equipment. Configure information so that after the handover, the user equipment maintains the uplink transmission with the base station and performs the downlink transmission via the target base station, or after the handover, the user equipment maintains the downlink transmission with the base station. and perform the uplink transmission via the target base station;

38. The base station according to claim 37, wherein the processor is specifically configured to: when the base station is a micro base station and the target base station is a macro base station, determine to switch the downlink transmission of the user equipment To the first cell served by the macro base station; or,

39. The base station according to claim 37 or 38, characterized in that:

The frequencies of the target base station and the source base station overlap.

40. The base station according to any one of claims 37-39, characterized in that:

The transmitter is also used to: send a wireless resource allocation request message to the target base station, the The allocation request message is used by the target base station to allocate downlink resources corresponding to the downlink transmission to be switched or uplink resources corresponding to the uplink transmission to be switched to the user equipment in the first cell.

41. The base station according to any one of claims 37-40, characterized in that:

The transmitter is also configured to: send a media access control layer control unit MAC CE to the user equipment, where the MAC CE is used to indicate whether to allow separation of uplink transmission and downlink transmission.

42. The base station according to any one of claims 37-41, characterized in that:

43. The base station according to any one of claims 37-42, characterized in that:

44. The base station according to any one of claims 37-43, characterized in that:

The switching command also includes an indication mark;

The indication mark is used to instruct the user equipment and the target base station to create a downlink for carrying the downlink transmission to be switched or to create an uplink for carrying the uplink transmission to be switched. link, and retains the uplink and downlink with the base station.

45. A base station, characterized by including:

A receiver, configured to receive a handover request message sent by the source base station, where the handover request contains downlink transmission information or uplink transmission information to be switched by the user equipment;

A processor, configured to determine to allow the downlink transmission or uplink transmission of the user equipment to be switched to the first cell provided by the base station;

A transmitter configured to send to the source base station the downlink resource configuration information corresponding to the downlink transmission to be switched or the uplink resource configuration information corresponding to the uplink transmission to be switched allocated to the user equipment, so that the user equipment maintains the The uplink transmission with the source base station and the downlink transmission via the base station, or so that after the handover, the user equipment maintains the downlink transmission with the source base station and performs the uplink via the base station transmission; transmission

46. The base station according to claim 45, characterized in that: the processor is specifically used for:

47. The base station according to claim 45 or 46, the receiver is further configured to: receive a wireless resource allocation request message sent by the source base station, the wireless resource allocation request message being used by the base station for the third base station. In a cell, the user equipment is allocated downlink resources corresponding to the downlink transmission to be switched or uplink resources corresponding to the uplink transmission to be switched.

48. The base station according to any one of claims 45-47, characterized in that:

The downlink transmission information also includes one or any combination of the following: at least one evolved radio access bearer E-RAB identity, E-RAB quality of service parameters corresponding to the at least one E-RAB identity, and radio resource control context information. ; Wherein, the radio resource control context information includes: downlink radio resource dedicated configuration information and/or cell-radio network temporary identity C-RNTI information of the user equipment; The uplink transmission information includes one or any combination of the following: at least one E-RAB identifier, the E-RAB quality of service parameter corresponding to the at least one E-RAB identifier, and radio resource control context information; wherein, the radio resource The control context information includes: uplink radio resource dedicated configuration information and/or C-RNTI information of the user equipment.

49. A user equipment, characterized by: including:

A receiver, configured to receive a switching command sent by the source base station, where the switching command has downlink resource configuration information corresponding to the downlink transmission to be switched or uplink resource configuration information corresponding to the uplink transmission to be switched allocated to the user equipment;

A processor configured to perform downlink resource configuration according to the downlink resource configuration information, and after the handover, the user equipment maintains the uplink transmission with the source base station and performs the downlink transmission via the target base station; or according to the uplink resources The configuration information configures uplink resources, and after the handover, the user equipment maintains the downlink transmission with the source base station and performs the uplink transmission via the target base station;

50. The user equipment according to claim 49, characterized in that:

The switching command also includes an indication mark;

51. The user equipment according to claim 49 or 50, characterized in that the processor is also used to:

Divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, where the uplink PDCP entity corresponds to the second cell provided by the source base station, and the downlink PDCP entity corresponds to the first cell provided by the target base station; Divide the RLC entity into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponds to the second cell provided by the source base station, and the downlink RLC entity corresponds to the first cell provided by the target base station;

52. The user equipment according to claim 51, wherein the source base station is a micro base station, and the target base station is a macro base station.

53. The user equipment according to claim 49 or 50, characterized in that:

The processor is further configured to: divide the PDCP entity into an uplink PDCP entity and a downlink PDCP entity, the uplink PDCP entity corresponds to the first cell provided by the target base station, and the downlink PDCP entity corresponds to the source base station The second cell correspondence provided;

Divide the RLC entity into an uplink RLC entity and a downlink RLC entity, the uplink RLC entity corresponds to the first cell provided by the target base station, and the downlink RLC entity corresponds to the second cell provided by the source base station;

54. The user equipment according to claim 53, wherein the source base station is a macro base station, and the target base station is a micro base station.