CN114424622B - Switching method, switching processing method, communication system and storage medium - Google Patents
Switching method, switching processing method, communication system and storage medium Download PDFInfo
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Abstract
The application discloses a switching method, a switching processing method, a communication system and a storage medium. Wherein the method comprises the following steps: the user equipment receives a switching command, wherein the switching command is used for indicating the user equipment to execute switching based on a dual-activation protocol stack; the user equipment rebuilds a packet data convergence protocol entity and a radio link control entity corresponding to the data radio bearer of the unconfigured dual-activation protocol stack to target access network equipment; the user equipment initiates random access to the target access network equipment based on the switching command.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a handover method, a handover processing method, a communication system, and a storage medium.
Background
Currently, in the third generation partnership project (3 rd Generation Partnership Project, abbreviated as 3 GPP) mobility enhancement, a dual active protocol stack (Dual Active Protocol Stack, abbreviated as DAPS) optimization method for reducing interruption time at the time of handover is proposed, and the main idea is that a User Equipment (UE) will maintain the protocol stacks of a source cell and a target cell at the same time during handover. And the DAPS handover supports the DAPS of the per data radio bearer (Data Wireless Bearer, abbreviated as DRB), that is, during the handover, a part of DRBs will keep dual active stacks, and the DRBs without the DAPS handover will emulate the current handover procedure, and the packet data convergence protocol (Packet Data Convergence Protocol, abbreviated as PDCP) and the radio link control (Radio Link Control, abbreviated as RLC) entity corresponding to the DRBs will be rebuilt to the target side after receiving the handover command. Among these, the problems include long term evolution (Long Term Evolution, abbreviated as LTE) and New Radio (NR).
When switching, similar to the LTE system, the NR system supports the switching process of the connected UE. When a user using a network service moves from one cell to another cell, or due to radio transmission traffic load adjustment, active operation maintenance, equipment failure, etc., the system transfers the communication link between the user and the original cell to the new cell, i.e., performs a handover procedure, in order to ensure the continuity of communication and the quality of service.
After the UE fails to perform the DAPS handover, the UE may return to the connection of the source cell, and for those DRBs that are not configured with the DAPS, the source cell side does not reserve the corresponding protocol stack, which may cause a problem of data transmission interruption.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the application provides a switching method, a switching processing method, a communication system and a storage medium. In order to at least solve the technical problem that in the related art, after the UE fails to perform the DAPS handover, for the DRB not configured with the DAPS, the source cell does not reserve the corresponding protocol stack, so that data transmission may be interrupted.
According to an aspect of an embodiment of the present application, there is provided a handover method, including: the UE receives a switching command, wherein the switching command is used for indicating the UE to execute DAPS-based switching; the UE rebuilds a PDCP entity and an RLC entity corresponding to the DRB which is not configured with the DAPS to target access network equipment; the UE initiates random access to the target access network equipment based on the switching command.
In an embodiment, in case that the UE fails to randomly access the target access network device, for the DRB configured with the DAPS, the UE reconfigures the PDCP entity of the DRB to a standard (normal) PDCP entity and releases the RLC entity of the target access network device corresponding to the DRB.
In an embodiment, the method further includes: under the condition that the UE fails to randomly access the target access network equipment, for DRB (digital radio bearer) without DAPS (DAPS), the UE rebuilds a PDCP (packet data protocol) entity corresponding to the DRB and an RLC entity corresponding to the PDCP entity to the source access network equipment; or the UE establishes corresponding PDCP and RLC entities based on the reserved configuration information of the PDCP and RLC entities of the source access network equipment.
In an embodiment, the handoff command carries indication information of the DRB for indicating the DAPS handoff.
In an embodiment, the method further includes: for the DRB having configured the DAPS, the UE reconfigures the PDCP entity of the DRB to a PDCP entity of a dual active data protocol and establishes an RLC entity corresponding to the PDCP entity.
According to another aspect of the embodiments of the present application, there is further provided a handover processing method, including: under the condition that the UE fails to randomly access the target access network equipment, for DRB (digital radio bearer) without DAPS (DAPS), the UE rebuilds a PDCP (packet data protocol) entity corresponding to the DRB and an RLC entity corresponding to the PDCP entity to the source access network equipment; or the UE establishes corresponding PDCP and RLC entities based on the reserved configuration information of the PDCP and RLC entities of the source access network equipment.
According to still another aspect of the embodiments of the present application, there is further provided a handover method, including: the UE receives a switching command, wherein the switching command is used for indicating the UE to execute DAPS-based switching; the UE rebuilds the PDCP entity and the RLC entity corresponding to the DRB which is not configured with the DAPS to target access network equipment, and the source access network equipment keeps configuration information of the PDCP entity and the RLC entity; and the UE initiates random access to the target access network equipment, and when the random access fails, the UE re-accesses the source access network equipment based on the configuration information.
According to still another aspect of the embodiments of the present application, there is further provided a handover method, including: under the condition that UE (user equipment) fails to switch, the source access network equipment acquires configuration information of a PDCP (packet data protocol) entity and an RLC entity corresponding to the DRB, wherein the switching command is used for indicating the UE to execute switching based on DAPS (DAPS) on the DRB; the source access network equipment establishes corresponding PDCP and RLC entities based on the acquired configuration information of the PDCP and RLC entities, and establishes connection with the UE through the DRB.
In an embodiment, the source access network device obtains configuration information of a PDCP entity and an RLC entity corresponding to the DRB, including: after the source access network equipment forwards the switching command to the UE, the source access network equipment keeps the configuration information of the current PDCP entity and the RLC entity; when the UE fails to switch, the source access network equipment determines the configuration information of the PDCP entity and the RLC entity corresponding to the DRB based on the configuration information of the current PDCP entity and the RLC entity, wherein the switching command is used for indicating the UE to execute switching based on the DAPS to the DRB; or the source access network equipment receives the configuration information of the PDCP entity and the RLC entity corresponding to the DRB from the target access network equipment, wherein when the configuration information of the PDCP entity and the RLC entity corresponding to the DRB received from the target access network equipment is the source access network equipment, the source access network equipment forwards the data to the target access network equipment.
In an embodiment, the method further includes: under the condition that the source access network equipment receives a switching command, the source access network equipment forwards the designated data to the target access network equipment, and after the user equipment fails to switch, the source access network equipment receives the designated data sent by the target access network equipment; or after forwarding the specified data to the target access network device, the source access network device continues to retain the specified data.
In an embodiment, the specified data at least includes downlink data and a sequence number that have not received correct feedback.
In an embodiment, the configuration information includes at least one of the following: sequence number assignment state, counter maintenance state, reorder window parameters, reassembly window parameters, reorder window variables, reassembly window variables, timer related configuration, and compression-decompression related configuration.
According to still another aspect of the embodiments of the present application, there is provided a switching apparatus, applied to a user equipment, including: a communication unit, configured to receive a handover command, where the handover command is configured to instruct a user equipment to perform handover based on a dual-activation protocol stack; the processing unit is used for reconstructing a packet data convergence protocol entity and a radio link control entity corresponding to the data radio bearer to target access network equipment for the data radio bearer not configured with the dual-activation protocol stack; and initiating random access to the target access network device based on the handover command.
In an embodiment, the processing unit is further configured to reconfigure, for the data radio bearer configured with the dual-activation protocol stack, a packet data convergence protocol entity of the data radio bearer to a standard normal PDCP entity and release a radio link control entity corresponding to the data radio bearer from the target access network device in case that the random access of the user equipment to the target access network device fails.
In an embodiment, the processing unit is further configured to: under the condition that the random access of the user equipment to the target access network equipment fails, reconstructing a packet data convergence protocol entity corresponding to the data radio bearer and a radio link control entity corresponding to the packet data convergence protocol entity to the source access network equipment for the data radio bearer not configured with the dual-activation protocol stack; or, establishing the corresponding packet data convergence protocol and the radio link control entity based on the reserved configuration information of the packet data convergence protocol and the radio link control entity of the source access network device.
In an embodiment, the switching command carries indication information of the DRB for indicating the DAPS switching.
In an embodiment, the processing unit is further configured to perform the following operations: and for the data radio bearer with the dual-activation protocol stack, the packet data convergence protocol entity of the data radio bearer is reconfigured into the packet data convergence protocol entity of the dual-activation data protocol, and a radio link control entity corresponding to the packet data convergence protocol entity is established.
According to still another aspect of the embodiments of the present application, there is provided a UE, including: the above switching device.
According to still another aspect of the embodiments of the present application, there is provided a UE, including: a signal transceiving circuit for receiving a handover command, wherein the handover command is used for instructing the UE to perform DAPS-based handover; a processor, configured to reconstruct, for a DRB not configured with a DAPS, a PDCP entity and an RLC entity corresponding to the DRB to a target access network device; and initiating random access to the target access network device.
In an embodiment, the processor is further configured to reconfigure, for the DRB configured with the DAPS, the PDCP entity of the DRB to a standard normal PDCP entity and release the RLC entity corresponding to the DRB from the target access network device when the user fails in random access.
In an embodiment, the processor is further configured to reconstruct, when the UE fails to access randomly, a PDCP entity corresponding to the DRB and an RLC entity corresponding to the PDCP entity to the source access network device for the DRB where the DAPS is not configured; or establishing corresponding PDCP and RLC entities based on the reserved configuration information of the PDCP and RLC entities of the source access network equipment.
According to still another aspect of the embodiments of the present application, there is provided a switching apparatus, which is applied to a source access network device, where the switching apparatus includes: the acquisition module is used for acquiring configuration information of a packet data convergence protocol entity and a radio link control entity corresponding to a data radio bearer under the condition that the user equipment fails to switch; the establishing module is used for establishing the corresponding packet data convergence protocol and the corresponding radio link control entity based on the obtained configuration information of the packet data convergence protocol and the radio link control entity, and establishing connection with the user equipment through a data radio bearer.
In one embodiment, the acquisition module includes: the first access module is used for reserving configuration information of a current packet data convergence protocol entity and a radio link control entity after the source access network equipment forwards the switching command to the user equipment; when the user equipment fails to switch, determining configuration information of a packet data convergence protocol entity and a radio link control entity corresponding to a data radio bearer based on the configuration information of the current packet data convergence protocol entity and the radio link control entity, wherein a switching command is used for indicating the user equipment to execute switching based on a dual-activation protocol stack on the data radio bearer; and the second access module is used for receiving the configuration information of the packet data convergence protocol entity and the radio link control entity corresponding to the data radio bearer from the target access network equipment, wherein when the configuration information of the packet data convergence protocol entity and the radio link control entity corresponding to the data radio bearer received from the target access network equipment is that the source access network equipment receives a switching command, the source access network equipment forwards the data to the target access network equipment.
The device is also used for executing the following processing procedures: under the condition that the source access network equipment receives a switching command, the source access network equipment forwards the designated data to the target access network equipment, and after the user equipment fails to switch, the source access network equipment receives the designated data sent by the target access network equipment; or after forwarding the specified data to the target access network device, the source access network device continues to retain the specified data.
In an embodiment, the specified data at least includes downlink data and a sequence number that have not received correct feedback.
According to yet another aspect of an embodiment of the present application, there is provided an access network device, including: the above switching device.
According to yet another aspect of embodiments of the present application, there is provided a communication system including: UE, target access network device and source access network device; the source access network equipment is used for forwarding a switching command of the target access network equipment to the UE, wherein the switching command is used for indicating the UE to execute the switching based on the DAPS; and the UE is used for disconnecting the connection with the source access network equipment when receiving the switching command, and reconstructing the PDCP entity and the RLC entity corresponding to the DRB to the target access network equipment for the DRB which is not configured with the DAPS so as to initiate random access to the target access network equipment based on the switching command.
According to still another aspect of the embodiments of the present application, there is provided a computer-readable storage medium storing a computer program that causes a computer to execute the above handover method.
According to yet another aspect of embodiments of the present application, there is provided a computer program product comprising computer program instructions for causing a computer to perform the above handover method.
In the embodiment of the present application, since the UE reestablishes the PDCP entity and the RLC entity corresponding to the DRB without the DAPS to the target access network device when receiving the Handover command, when the Handover fails, the UE may continue transmission of the non-DAPS HO (Handover) DRB after switching back to the source access network device, thereby solving the technical problem that in the related art, when the UE fails to perform the DAPS Handover, for the DRB without the DAPS, because the source cell does not reserve the corresponding protocol stack, data transmission may be interrupted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic diagram of an Xn interface-based handover procedure according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a communication system according to an embodiment of the present application;
FIG. 3 is a flow chart of a handover method according to an embodiment of the present application;
fig. 4 is a flow chart of a handover processing method according to an embodiment of the present application;
FIG. 5 is a flow chart of another handover method according to an embodiment of the present application;
FIG. 6 is a flow chart of another handover method according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present application;
fig. 8 is a schematic structural view of a switching device according to an embodiment of the present application;
fig. 9 is a schematic structural view of another switching device according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the related art, when the UE performs an Xn handover (where an Xn interface is an interface between access networks), its general procedure is shown in fig. 1, and the whole handover procedure is divided into the following three phases (handover flow based on an Xn interface is shown in fig. 1):
(1) Switching preparation: including measurement control and reporting, handover requests, and acknowledgements. The handover confirmation message contains the handover command generated by the target cell, and the source cell does not allow any modification to the handover command generated by the target cell, and directly forwards the handover command to the UE.
(2) The switching is performed: the UE performs a handover procedure immediately after receiving the handover command, i.e., the UE disconnects the source cell and connects with the target cell (e.g., performs random access, sends a radio resource control (Radio Resource Control, abbreviated as RRC) handover complete message to the target base station, etc.).
(3) And (3) switching is completed: the target cell performs Path Switch (Path Switch, PS) with an access and mobility management function (Access and Mobility on Management Function, AMF, for short) and a user plane function (User Plane Function, UPF, for short), releasing the UE context of the source base station, including but not limited to security information (e.g., UE Security Capabilities) of the UE, capability information of the UE, protocol data unit (Protocol Data Unit, PDU, for short) session information, and the like.
However, when the handover fails, the UE may switch back to the source base station, but since the source base station does not reserve its corresponding protocol stack, a problem of interruption of data transmission may occur. For this problem, in the embodiment of the present application, the UE re-establishes PDCP and RLC entities corresponding to DRBs not configured with DAPS to the target base station, so that when the handover fails, the source base station can re-access the UE based on the relevant configurations of the PDCP entity and RLC entity, thereby avoiding interruption of data transmission. The following is a detailed description of the embodiments.
Fig. 2 is a schematic structural diagram of a communication system according to an embodiment of the present application; as shown in fig. 4, the communication system includes: user device 20, target access network device 22, and source access network device 24; wherein:
a source access network device 24, configured to forward a handover command of the target access network device to the user device, where the handover command is used to instruct the user device to perform handover based on the dual activation protocol stack;
the ue 20 is configured to disconnect from the source access network device 24 when receiving the handover command, and reestablish the PDCP entity and the RLC entity corresponding to the DRB to the target access network device 22 for the data radio bearer where the dual active protocol stack is not configured, so as to initiate random access to the target access network device 22.
In some embodiments of the present application, the user equipment 20 is further configured to, in case of failure of the random access target access network device, reconfigure, for the DRB configured with the DAPS, the PDCP entity of the DRB to the normal PDCP entity, and release the RLC entity corresponding to the DRB from the target access network device.
In some embodiments of the present application, the user equipment 20 is further configured to reconstruct, for a DRB not configured with a DAPS, a PDCP entity corresponding to the DRB and an RLC entity corresponding to the PDCP entity to the source access network device in case of failure of the random access target access network device; or establishing corresponding PDCP and RLC entities based on the reserved configuration information of the PDCP and RLC entities of the source access network equipment.
It should be noted that the source access network device includes, but is not limited to: a source base station; target access network devices include, but are not limited to: and the target base station.
In the operating environment illustrated in fig. 2, the present embodiments provide an embodiment of a handoff method, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than that illustrated herein.
Fig. 3 is a flow chart of a switching method according to an embodiment of the present application, as shown in fig. 1, the method includes the following steps:
in step S302, the target access network device sends a handoff command to the source access network device, where the handoff command is used to instruct the user device to perform a DAPS-based handoff.
Step S304, the source access network device forwards the switching command to the user device, and the user device receives the switching command;
specifically, the UE receives a handoff command that instructs the UE to perform a handoff of the DAPS, and DRB for the DAPS handoff is indicated in the handoff command.
In step S306, the user equipment re-establishes the PDCP entity and RLC entity corresponding to the DRB without DAPS to the target access network equipment.
Step S308, the user equipment initiates random access to the target access network equipment.
It should be noted that the steps of forwarding the handover command by the source access network device in steps S302 and S304 are optional, i.e. the steps may not be performed in case the UE has received the handover command.
Specifically, the UE synchronizes to the target access network device, including the UE initiating random access to the target access network device while the UE maintains radio link management (Radio Link Management, abbreviated RLM) for the source access network device.
In some embodiments of the present application, when the PDCP entity and the RLC entity corresponding to the data radio bearer where the DAPS is not configured are rebuilt to the target access network device, the source access network device retains configuration information of the PDCP entity and the RLC entity. By adopting the means, the problem that the UE fails to switch and the data transmission is interrupted when switching back to the source access network equipment can be avoided.
In some embodiments of the present application, the configuration information includes at least one of: sequence number assignment status, counter maintenance status, reordering window and/or reassembly window parameters, variables, timer related configuration, compression decompression related configuration.
In some embodiments of the present application, in the case that the random access of the ue to the target access network device fails, for the data radio bearer configured with the DAPS, the ue reconfigures the PDCP entity of the data radio bearer to the normal PDCP entity, and releases the RLC entity corresponding to the data radio bearer from the target access network device.
In some embodiments of the present application, in the case that the random access of the user equipment to the target access network device fails, for a data radio bearer not configured with the DAPS, the user equipment reestablishes a PDCP entity corresponding to the data radio bearer and an RLC entity corresponding to the PDCP entity to the source access network device; or the user equipment establishes corresponding PDCP and RLC entities based on the reserved configuration information of the PDCP and RLC entities of the source access network equipment.
In some embodiments of the present application, in the case that the source access network device receives the handover command, the source access network device has forwarded the specified data to the target access network device, and after the user device fails to handover, the target access network device forwards the specified data to the source access network device again; or after forwarding the specified data to the target access network device, the source access network device continues to retain the specified data.
The specified data at least comprises downlink data and sequence numbers which are not fed back correctly.
In some embodiments of the present application, the foregoing handoff command carries indication information of the DRB for indicating the DAPS handoff, so that the UE may determine the DRB for performing the DAPS handoff based on the indication information.
In some embodiments of the present application, for a data radio bearer for which a DAPS has been configured, a user equipment reconfigures a PDCP entity of the data radio bearer to a PDCP entity of a dual active data protocol and establishes an RLC entity corresponding to the PDCP entity.
The embodiment of the application also provides another handover processing method, as shown in fig. 4, which includes:
step S402, the random access of the user equipment to the target access network equipment fails;
Step S404, for the data radio bearer not configured with DAPS, the user equipment rebuilds the PDCP entity corresponding to the DRB and the RLC entity corresponding to the PDCP entity to the source access network equipment;
in step S406, the ue establishes corresponding PDCP and RLC entities based on the reserved PDCP and RLC entity configuration information of the source access network device.
It should be noted that, steps S404 and S406 are two parallel steps, that is, two independent steps, and there is no precedence relationship.
It should be further noted that the preferred implementation of the embodiment shown in fig. 4 may be referred to the related descriptions in fig. 2-3, and will not be repeated here.
By adopting the processing steps, the technical problem that in the related art, after the UE fails to execute the DAPS handover, for the DRB without the DAPS, the source cell does not reserve the corresponding protocol stack, and data transmission interruption may occur can be solved.
Fig. 5 is a flow chart of another handover method according to an embodiment of the present application, as shown in fig. 5, the method includes the following steps:
in step S502, the target access network device sends a handover command to the source access network device, where the handover command is used to instruct the user device to perform a DAPS-based handover.
Step S506, the user equipment rebuilds the PDCP entity and the RLC entity corresponding to the data radio bearer without the DAPS to the target access network equipment, and the source access network equipment keeps the configuration information of the PDCP entity and the RLC entity;
step S508, the user equipment initiates random access to the target access network equipment, and when the random access fails, the UE re-accesses the source access network equipment based on the configuration information.
It should be noted that, the preferred implementation of the embodiment shown in fig. 5 may be referred to the related descriptions in fig. 2-3, and will not be described herein.
Fig. 6 is a flow chart of another handover method according to an embodiment of the present application, as shown in fig. 6, the method includes the following steps:
in step S602, in case of failure in handover of the ue, the source access network device acquires configuration information of the PDCP entity and the RLC entity corresponding to the DRB, where the handover command is used to instruct the ue to perform a DAPS-based handover on the DRB.
In step S604, the source access network device establishes corresponding PDP and RLC entities based on the acquired configuration information of the PDCP and RLC entities, and establishes a connection with the user equipment through the DRB.
In some embodiments of the present application, the source access network device may acquire configuration information of the PDCP entity and the RLC entity corresponding to the data radio bearer by: after the source access network equipment forwards the switching command to the user equipment, the source access network equipment keeps the configuration information of the current PDCP entity and the RLC entity; when the user equipment fails to switch, the source access network equipment determines the configuration information of the PDCP entity and the RLC entity corresponding to the data radio bearer based on the configuration information of the current PDCP entity and the RLC entity, wherein the switching command is used for indicating the user equipment to execute the switching based on the DAPS on the data radio bearer; or the source access network equipment receives the configuration information of the PDCP entity and the RLC entity corresponding to the data radio bearer from the target access network equipment, wherein when the configuration information of the PDCP entity and the RLC entity corresponding to the data radio bearer received from the target access network equipment is the source access network equipment, the source access network equipment forwards the data to the target access network equipment.
Under the condition that the source access network equipment receives a switching command, the source access network equipment forwards the designated data to the target access network equipment, and after the user equipment fails to switch, the source access network equipment receives the designated data sent by the target access network equipment; or after forwarding the specified data to the target access network device, the source access network device continues to retain the specified data.
The specified data at least comprises downlink data and sequence numbers which are not fed back correctly.
In some embodiments of the present application, the configuration information includes at least one of: sequence number assignment state, counter maintenance state, reorder window parameters, reassembly window parameters, reorder window variables, reassembly window variables, timer related configuration, and compression-decompression related configuration.
It should be noted that, the preferred implementation of the embodiment shown in fig. 6 may be referred to the related descriptions in fig. 2-3, and will not be repeated here.
By adopting the processing steps, the technical problem that in the related art, after the UE fails to execute the DAPS handover, for the DRB without the DAPS, the source cell does not reserve the corresponding protocol stack, and data transmission interruption may occur can be solved.
Fig. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present application, as shown in fig. 7, the user equipment 7 includes:
and a signal transceiving circuit 70 for receiving a handoff command, wherein the handoff command is for instructing the user device to perform a DAPS-based handoff.
A processor 72, configured to reconstruct, for a data radio bearer not configured with a DAPS, a PDCP entity and an RLC entity corresponding to the data radio bearer to a target access network device; and initiating random access to the target access network device.
In some embodiments, the user device may also include memory 74.
In some embodiments of the present application, the foregoing processor 72 is further configured to, when the user fails to access the data radio bearer configured with the DAPS at random, reconfigure the PDCP entity of the data radio bearer to the standard normal PDCP entity, and release the RLC entity corresponding to the data radio bearer from the target access network device.
Specifically, the reconfiguration content includes, but is not limited to: and releasing the target side header compression, decompression and encryption/decryption functions.
In some embodiments of the present application, the foregoing processor 72 is further configured to reconstruct, when the random access of the user equipment fails, for a DRB not configured with the DAPS, a PDCP entity corresponding to the DRB and an RLC entity corresponding to the PDCP entity to the source access network device; or establishing corresponding PDCP and RLC entities based on the reserved configuration information of the PDCP and RLC entities of the source access network equipment.
In some embodiments of the present application, the above processor 72 is further configured to, when the random access of the UE fails, if the source access network device has forwarded data to the target access network device when receiving the handover command, the target access network device should forward the forwarded data to the source access network device again after the UE HOF, where the data includes the SN number and the downlink data for which the correct feedback is not received.
The embodiment of the application also provides a switching device, which is applied to the user equipment, as shown in fig. 8, and includes:
a communication unit 80 for receiving a handoff command, wherein the handoff command is for instructing the user device to perform a DAPS-based handoff; the communication unit 80 may be implemented by a signal transceiving circuit as described in fig. 7, which may of course also be embodied as a software program module.
A processing unit 82, configured to reconstruct, for a DRB not configured with a DAPS, a PDCP entity and an RLC entity corresponding to the DRB to a target access network device; and initiating random access to the target access network device based on the handover command. The processing unit 82 may be implemented by the processor 72 shown in fig. 7, which may of course also be embodied as a software program module.
In some embodiments of the present application, when the random access fails, the UE may switch back to the source base station using different schemes for different situations, for example:
The processing unit 82 is further configured to, in case that the UE fails to randomly access the target access network device, reconfigure, for the DRB configured with the DAPS, the PDCP entity of the DRB to a standard normal PDCP entity, and release the RLC entity corresponding to the DRB from the target access network device.
Also for example, the processing unit 82 is further configured to perform the following operations: under the condition that the random access of the user equipment to the target access network equipment fails, reconstructing a PDCP entity corresponding to the DRB and an RLC entity corresponding to the PDCP entity to the source access network equipment for the DRB which is not configured with the DAPS; or establishing corresponding PDCP and RLC entities based on the reserved configuration information of the PDCP and RLC entities of the source access network equipment.
The switching command carries indication information of DRB for indicating DAPS switching.
In some embodiments of the present application, the processing unit 82 is further configured to perform the following operations: for the DRB having configured the DAPS, the PDCP entity of the DRB is reconfigured as a PDCP entity of a dual active data protocol, and an RLC entity corresponding to the PDCP entity is established.
The embodiment of the application also provides a user equipment, which includes but is not limited to the switching device in the embodiment shown in fig. 8.
The embodiment of the application also provides a switching device, which is applied to source access network equipment, as shown in fig. 9, and includes:
An acquiring module 90, configured to acquire configuration information of a PDCP entity and an RLC entity corresponding to the DRB in case of handover failure of the ue;
the establishing module 92 is configured to establish corresponding PDCP and RLC entities based on the acquired configuration information of the PDCP and RLC entities, and establish a connection with the user equipment through the DRB.
In some embodiments of the present application, the acquisition module 90 includes:
a first access module 900, configured to, after the source access network device forwards the handover command to the user equipment, reserve configuration information of the current PDCP entity and RLC entity; when the user equipment fails to switch, determining the configuration information of the PDCP entity and the RLC entity corresponding to the DRB based on the configuration information of the current PDCP entity and the RLC entity, wherein a switching command is used for indicating the user equipment to execute switching based on the DAPS to the DRB;
a second access module 902, configured to receive, from the target access network device, configuration information of the PDCP entity and the RLC entity corresponding to the DRB, where when the configuration information of the PDCP entity and the RLC entity corresponding to the DRB received from the target access network device is a source access network device, the source access network device has forwarded data to the target access network device.
In an embodiment, the obtaining module 900 is further configured to perform the following processing procedure: under the condition that the source access network equipment receives a switching command, the source access network equipment forwards the designated data to the target access network equipment, and after the user equipment fails to switch, the source access network equipment receives the designated data sent by the target access network equipment; or after forwarding the specified data to the target access network device, the source access network device continues to retain the specified data. The specified data at least comprises downlink data and sequence numbers which are not fed back correctly.
The embodiment of the application also provides an access network device, which comprises: the switching device is shown in fig. 9.
The embodiment of the application also provides a computer-readable storage medium for storing a computer program, where the computer program causes a computer to execute the above-described handover method, for example, the following method may be executed: receiving a switching command, wherein the switching command is used for indicating the UE to execute the switching based on the DAPS; reconstructing a PDCP entity and an RLC entity corresponding to the DRB which is not configured with the DAPS to target access network equipment; and initiating random access to the target access network equipment based on the switching command.
Embodiments of the present application also provide a computer program product comprising computer program instructions for causing a computer to perform the above-described handover method.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.
Claims (19)
1. A method of handover, comprising:
the user equipment receives a switching command, wherein the switching command is used for indicating the user equipment to execute switching based on a dual-activation protocol stack;
the user equipment rebuilds a packet data convergence protocol entity corresponding to the data radio bearer of which the dual-activation protocol stack is not configured to target access network equipment;
the user equipment initiates random access to the target access network equipment based on the switching command;
when reconstructing a packet data convergence protocol entity and a radio link control entity corresponding to a data radio bearer of an unconfigured dual-activation protocol stack to target access network equipment, the source access network equipment reserves configuration information of the current packet data convergence protocol entity and the radio link control entity, wherein the configuration information comprises a sequence number distribution state, a counter maintenance state, a reordering window parameter, a reorganization window parameter, a reordering window variable, a reorganization window variable, a timer related configuration and a compression and decompression related configuration;
Wherein the method further comprises:
and under the condition that the random access of the user equipment to the target access network equipment fails, for the data radio bearer without the dual-activation protocol stack, the user equipment establishes corresponding packet data convergence protocol and radio link control entity based on the reserved configuration information of the packet data convergence protocol entity and the radio link control entity of the source access network equipment.
2. The method according to claim 1, wherein the method further comprises:
under the condition that the random access of the user equipment to the target access network equipment fails, for the data radio bearer configured with the dual-activation protocol stack, the user equipment reconfigures a packet data convergence protocol entity of the data radio bearer to a standard packet data convergence protocol entity, and releases a radio link control entity corresponding to the data radio bearer of the target access network equipment.
3. The method of claim 1 wherein the handover command carries indication information for indicating a data radio bearer DRB for dual active protocol stack DAPS handover.
4. A method according to any one of claims 1 to 3, characterized in that the method further comprises: and for the data radio bearer with the dual-activation protocol stack, the user equipment re-assembles the packet data convergence protocol entity of the data radio bearer into the packet data convergence protocol entity of the dual-activation data protocol, and establishes a radio link control entity corresponding to the packet data convergence protocol entity.
5. A method of handover, comprising:
under the condition that the switching of the user equipment fails, the source access network equipment acquires configuration information of a packet data convergence protocol entity and a radio link control entity corresponding to a data radio bearer, wherein the configuration information comprises a sequence number distribution state, a counter maintenance state, a reordering window parameter, a reorganization window parameter, a reordering window variable, a reorganization window variable, a timer related configuration and a compression and decompression related configuration;
the source access network device establishes a corresponding packet data convergence protocol and a corresponding radio link control entity based on the acquired configuration information of the packet data convergence protocol and the radio link control entity, and establishes connection with the user equipment through the data radio bearer;
the source access network device obtains configuration information of a packet data convergence protocol entity and a radio link control entity corresponding to a data radio bearer, including:
after the source access network device forwards the switching command to the user device, the source access network device reserves the configuration information of the current packet data convergence protocol entity and the radio link control entity; and when the user equipment fails to switch, the source access network equipment determines the configuration information of the packet data convergence protocol entity and the radio link control entity corresponding to the data radio bearer based on the configuration information of the current packet data convergence protocol entity and the radio link control entity, wherein the switching command is used for indicating the user equipment to execute switching based on a dual-activation protocol stack on the data radio bearer.
6. The method of claim 5, wherein the method further comprises: under the condition that the source access network equipment receives a switching command, the source access network equipment forwards specified data to target access network equipment, and after the user equipment fails to switch, the source access network equipment receives the specified data sent by the target access network equipment; or after forwarding the specified data to the target access network device, the source access network device continues to retain the specified data.
7. The method of claim 6, wherein the specified data includes at least downlink data and sequence numbers for which no correct feedback was received.
8. A switching apparatus for use in a user equipment, comprising:
a communication unit, configured to receive a handover command, where the handover command is configured to instruct the user equipment to perform handover based on a dual-activation protocol stack;
the processing unit is used for reconstructing a packet data convergence protocol entity and a radio link control entity corresponding to a data radio bearer which is not configured with a dual-activation protocol stack to target access network equipment; and initiating random access to the target access network device based on the handover command;
When reconstructing the packet data convergence protocol entity and the radio link control entity corresponding to the data radio bearer to the target access network device, the source access network device reserves configuration information of the current packet data convergence protocol entity and the radio link control entity, wherein the configuration information comprises a sequence number distribution state, a counter maintenance state, a reordering window parameter, a reorganization window parameter, a reordering window variable, a reorganization window variable, a timer related configuration and a compression decompression related configuration;
wherein the processing unit is further configured to perform the following operations: and under the condition that the random access of the user equipment to the target access network equipment fails, for the data radio bearer without the dual-activation protocol stack, establishing corresponding packet data convergence protocol and radio link control entity based on the reserved configuration information of the packet data convergence protocol and the radio link control entity of the source access network equipment.
9. The apparatus of claim 8, wherein the processing unit is further configured to reconfigure a packet data convergence protocol entity of a dual-active protocol stack to a standard packet data convergence protocol, PDCP, entity for the data radio bearer configured in case that the random access of the user equipment to the target access network equipment fails, and release a radio link control entity corresponding to the data radio bearer for the target access network equipment.
10. The apparatus of claim 8, wherein the handover command carries indication information for indicating a data radio bearer DRB for dual active protocol stack DAPS handover.
11. The apparatus according to any one of claims 8 to 10, wherein the processing unit is further configured to: and for the data radio bearer with the dual-activation protocol stack, re-configuring the packet data convergence protocol entity of the data radio bearer into the packet data convergence protocol entity of the dual-activation data protocol, and establishing a radio link control entity corresponding to the packet data convergence protocol entity.
12. A user device, comprising: the switching device of any one of claims 8 to 11.
13. A switching apparatus, applied in a source access network device, comprising:
the system comprises an acquisition module, a data radio bearer switching module and a control module, wherein the acquisition module is used for acquiring configuration information of a packet data convergence protocol entity and a radio link control entity corresponding to a data radio bearer under the condition of user equipment switching failure, wherein the configuration information comprises a sequence number distribution state, a counter maintenance state, a reordering window parameter, a reorganization window parameter, a reordering window variable, a reorganization window variable, a timer related configuration and a compression decompression related configuration;
The establishing module is used for establishing corresponding packet data convergence protocol and radio link control entity based on the obtained configuration information of the packet data convergence protocol and the radio link control entity, and establishing connection with the user equipment through the data radio bearer;
wherein, the acquisition module includes:
the first access module is used for reserving the configuration information of the current packet data convergence protocol entity and the radio link control entity after the source access network equipment forwards the switching command to the user equipment; and when the user equipment fails to switch, determining configuration information of the packet data convergence protocol entity and the radio link control entity corresponding to the data radio bearer based on the configuration information of the current packet data convergence protocol entity and the radio link control entity, wherein the switching command is used for indicating the user equipment to execute switching based on a dual-activation protocol stack on the data radio bearer.
14. The apparatus of claim 13, wherein the acquisition module is further configured to perform the following: under the condition that the source access network equipment receives a switching command, the source access network equipment forwards specified data to target access network equipment, and after the user equipment fails to switch, the source access network equipment receives the specified data sent by the target access network equipment; or after forwarding the specified data to the target access network device, the source access network device continues to retain the specified data.
15. The apparatus of claim 14, wherein the specified data includes at least downlink data and a sequence number for which no correct feedback was received.
16. An access network device, comprising: the switching device of any one of claims 13 to 15.
17. A communication system, comprising: user equipment, target access network equipment and source access network equipment; wherein,
the source access network device is configured to forward a handover command of the target access network device to the user device, where the handover command is used to instruct the user device to perform handover based on a dual-activation protocol stack;
the user equipment is used for disconnecting the connection with the source access network equipment when receiving the switching command, rebuilding a packet data convergence protocol entity and a radio link control entity corresponding to the data radio bearer to target access network equipment for the data radio bearer not configured with a dual-activation protocol stack, and initiating random access to the target access network equipment based on the switching command;
when reconstructing the packet data convergence protocol entity and the radio link control entity corresponding to the data radio bearer to the target access network device, the source access network device reserves configuration information of the current packet data convergence protocol entity and the radio link control entity, wherein the configuration information comprises a sequence number distribution state, a counter maintenance state, a reordering window parameter, a reorganization window parameter, a reordering window variable, a reorganization window variable, a timer related configuration and a compression decompression related configuration;
And the user equipment is further configured to establish, for a data radio bearer not configured with a dual-activation protocol stack, a corresponding packet data convergence protocol and a radio link control entity based on the reserved configuration information of the packet data convergence protocol and the radio link control entity of the source access network device under the condition that random access to the target access network device fails.
18. The communication system according to claim 17, wherein the ue is further configured to reconfigure, for a data radio bearer configured with a dual-active protocol stack, a packet data convergence protocol entity of the data radio bearer to a standard packet data convergence protocol entity and release a radio link control entity corresponding to the data radio bearer from the target access network device in case of failure of random access to the target access network device.
19. A computer-readable storage medium storing a computer program for causing a computer to execute the handover method according to any one of claims 1 to 4; or performing the handover method of any one of claims 5 to 7.
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| WO2017138978A1 (en) * | 2016-02-12 | 2017-08-17 | Intel IP Corporation | Systems and methods for reducing interruptions in data transmissions due to handover operations |
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| WO2019070635A1 (en) * | 2017-10-02 | 2019-04-11 | Mediatek Singapore Pte. Ltd. | Method of data recovery with uplink switching |
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| US10333664B1 (en) * | 2016-09-19 | 2019-06-25 | Sprint Spectrum L.P. | Systems and methods for dynamically selecting wireless devices for uplink (UL) multiple-input-multiple-output (MIMO) pairing |
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