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EP-3661101-B1 - METHOD FOR ACTIVATING/DEACTIVATING REPEAT TRANSMISSION, BASE STATION, TERMINAL AND DEVICE

EP3661101B1EP 3661101 B1EP3661101 B1EP 3661101B1EP-3661101-B1

Inventors

  • CHEN, LI
  • XU, FANGLI
  • BERTRAND, PIERRE
  • LIU, JIAMIN
  • LI, XINYU

Dates

Publication Date
20260506
Application Date
20180803

Claims (7)

  1. A duplication activating/deactivating method, performed by a first base station in communication with a user equipment, UE, comprising determining (41) a correspondence relationship between a bearer which is allowed for duplication under the first base station and a bit of a preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication; wherein the preset field is used to indicate activation/deactivation duplication of the bearer which is allowed for duplication; and when determining to activate/deactivate duplication of the bearer which is allowed for duplication under the first base station, populating (42), by the first base station, the bit, which is in the preset field of the MAC CE for activating/deactivating duplication and corresponding to the bearer, thereby generating the MAC CE for activating/deactivating duplication, and transmitting to the UE the generated MAC CE for activating/deactivating duplication; wherein the method further includes: (i) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the first base station; bits in the preset field of the MAC CE from another base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the another base station; or, (ii) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication only under the first base station; and bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with special bearers which are allowed for duplication under the first base station; wherein the special bearers are retransmitted in a dual-connectivity manner or multi- connectivity mode, and a master base station for the special bearers is the first base station; wherein the step of determining the correspondence relationship between the bearer which is allowed for duplication under the first base station and the bit of a preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication, comprises: configuring, by the first base station, the correspondence relationship between the bit in the preset field of the MAC CE of the first base station for activating/deactivating duplication, and the bearer which is allowed for duplication under the first base station; and transmitting, by the first base station, the configured correspondence relationship to the UE.
  2. The method according to claim 1, wherein the method further comprises: configuring, by the first base station, another correspondence relationship between another bit in a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, and a bearer which is allowed for duplication under the another base station; and transmitting, by the first base station, the configured correspondence relationship to the UE; and/or, transmitting, by the first base station, the configured correspondence relationship to the corresponding base station.
  3. A duplication activating/deactivating method, performed by a user equipment, UE, in communication with base stations, comprising: determining (81) a correspondence relationship between a bearer which is allowed for duplication under a first base station and a bit of a preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication; wherein the preset field is used to indicate activation/deactivation duplication of the bearer which is allowed for duplication; and when receiving the MAC CE for activating/deactivating duplication transmitted from the first base station, according to the correspondence relationship, parsing (82) the bit, which is in the preset field of the MAC CE of the first base station for activating/deactivating duplication and corresponding to the bearer which is allowed for duplication under the first base station; according to indication of the bit, determining (83) activation/deactivation duplication of the corresponding bearer; wherein the method further includes: (i) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the first base station; bits in the preset field of the MAC CE from another base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the another base station; or, (ii) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication only under the first base station; and bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with special bearers which are allowed for duplication under the first base station; wherein the special bearers are retransmitted in a dual-connectivity manner or multi-connectivity mode, and a master base station for the special bearers is the first base station; wherein the step of determining the correspondence relationship between the bearer which is allowed for duplication under the first base station and the bit of the preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication, comprises: receiving the correspondence relationship configured by the first base station between the bit in the preset field of the MAC CE of the first base station for activating/deactivating duplication, and the bearer which is allowed for duplication under the first base station.
  4. The method according to claim 3, wherein the method further comprises: receiving a correspondence relationship configured by the first base station between a bit in a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, and a bearer which is allowed for duplication under the another base station.
  5. The method according to claim 4, wherein the method further comprises: when receiving the MAC CE for activating/deactivating duplication transmitted from another base station, according to the correspondence relationship, parsing the bit, which is in the preset field of the MAC CE of the another base station for activating/deactivating duplication and corresponding to the bearer which is allowed for duplication under the another base station; according to indication of the bit, determining activation/deactivation duplication of the corresponding bearer.
  6. A base station, comprising: a transceiver (920), a memory (910), a processor (900), and a computer program stored on the memory (910) and executable on the processor (900); wherein the processor (900) is used to read the program in the memory (910) and perform the following procedures: determining a correspondence relationship between a bearer which is allowed for duplication under a first base station and a bit of a preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication; wherein the preset field is used to indicate activation/deactivation duplication of the bearer which is allowed for duplication; when determining to activate/deactivate duplication of the bearer which is allowed for duplication under the first base station, populating, by the first base station, the bit, which is in the preset field of the MAC CE for activating/deactivating duplication and corresponding to the bearer, thereby generating the MAC CE for activating/deactivating duplication; transmitting, by the transceiver, the generated MAC CE for activating/deactivating duplication to the UE; wherein the base station further includes: (i) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the first base station; bits in the preset field of the MAC CE from another base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the another base station; or, (ii) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication only under the first base station; and bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with special bearers which are allowed for duplication under the first base station; wherein the special bearers are retransmitted in a dual-connectivity manner or multi- connectivity mode, and a master base station for the special bearers is the first base station; wherein when determining the correspondence relationship between the bearer which is allowed for duplication under the first base station and the bit of a preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication, the processor (900) is used to read the program in the memory (910) and perform the following procedures: configuring the correspondence relationship between the bit in the preset field of the MAC CE of the first base station for activating/deactivating duplication, and the bearer which is allowed for duplication under the first base station; and transmitting the configured correspondence relationship to the UE.
  7. A user equipment, UE, comprising: a transceiver (1120), a memory (1110), a processor (1100), and a computer program stored on the memory (1110) and executable on the processor (1100); wherein the processor (1100) is used to read the program in the memory (1110) and perform the following procedures: determining a correspondence relationship between a bearer which is allowed for duplication under a first base station and a bit of a preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication; wherein the preset field is used to indicate activation/deactivation duplication of the bearer which is allowed for duplication; the transceiver is used to receive the MAC CE for activating/deactivating duplication transmitted from the first base station; wherein the processor (1100) is further used to perform the following procedures: according to the correspondence relationship, parsing the bit, which is in the preset field of MAC CE of the first base station for activating/deactivating duplication and corresponding to the bearer which is allowed for duplication under the first base station; and, according to indication of the bit, determining activation/deactivation duplication of the corresponding bearer; wherein the user equipment further includes: (i) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the first base station; bits in the preset field of the MAC CE from another base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication under the another base station; or, (ii) the preset field of the MAC CE from the first base station for activating/deactivating duplication, and a preset field of MAC CE from another base station in communication with the UE for activating/deactivating duplication, have mutually independent structures; bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with bearers which are allowed for duplication only under the first base station; and bits in the preset field of the MAC CE from the first base station for activating/deactivating duplication, have correspondence relationship with special bearers which are allowed for duplication under the first base station; wherein the special bearers are retransmitted in a dual-connectivity manner or multi-connectivity mode, and a master base station for the special bearers is the first base station; wherein when determining the correspondence relationship between the bearer which is allowed for duplication under the first base station and the bit of the preset field of media access control, MAC, control element, CE, of the first base station for activating/deactivating duplication, the processor (1100) is used to read the program in the memory (1110) and perform the following procedures: receiving the correspondence relationship configured by the first base station between the bit in the preset field of the MAC CE of the first base station for activating/deactivating duplication, and the bearer which is allowed for duplication under the first base station.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit and priority of Chinese Application No. 201710737578.9, filed on August 24, 2017. TECHNICAL FIELD The present disclosure relates to the field of communication technologies, and in particular to a retransmission activating/deactivating method, a base station, a user equipment and a device. BACKGROUND 5G New Radio (NR) system mainly supports three types of services: enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC) and Ultra-Reliable and Low Latency Communications (URLLC). The URLLC has relatively high requirements on delay and reliability, and one solution provided by 3GPP is to introduce a retransmission mechanism, that is, to transmit the same Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU) through multiple paths. Transmission reliability can be improved and transmission delay can be reduced, through multipath transmission gain. The introduced PDCP retransmission is applicable not only to the URLLC service but also to other services. Retransmission models under Carrier aggregation (CA) and Dual connectivity (DC) are shown in FIG. 1 and FIG. 2, respectively. A radio bearer (corresponding to a PDCP entity) in the PDCP layer is transmitted through multiple logical channels (one logical channel is corresponding to one RLC entity) in the Radio Link Control Protocol (RLC) layer, respectively. As shown in FIG. 1, for the CA model, multiple logical channels corresponding to the radio bearer for retransmission are processed by one MAC entity in the MAC layer; and data from different RLC logical channels are respectively mapped to different radio resources on one carrier or different carriers, for transmission. As shown in FIG. 2, for the DC model, multiple logical channels corresponding to a duplication RB are mapped to different MAC entities; and data from multiple different RLC logical channels can be respectively mapped to different radio resources or carriers, for transmission. Currently, the retransmission mechanism is implemented through network-side configuration, that is, the network side configures which bearers (RBs) can be used for retransmission, and configures corresponding various layers (such as PDCP entity and RLC entity) for the specific RB (corresponding to an RB identity). Then, the network side uses MAC layer signaling MAC CE (i.e., MAC CE for activating/deactivating retransmission) to activate/deactivate retransmission. In the network deployment, the DC and CA configurations generally coexist. For bearers of a terminal, there may be several types of retransmission bearer configurations as shown in FIG. 3. DRB1 and DRB4 are CA retransmissions in Master Cell Group (MCG) and Secondary Cell Group (SCG), respectively; DRB2 and DRB3 are DC retransmissions in MCG and SCG, respectively. The MCG and the SCG belong to different base stations (5G base stations), i.e., a base station 1 and a base station 2, and both of the base station 1 and the base station 2 can transmit the MAC CE to activate and deactivate bearers for retransmission. In summary, different network nodes can transmit activation/deactivation retransmission MAC CEs to a user equipment (UE) for activating or deactivating bearers for retransmission. Different network nodes do not collaborate with another when they transmit activation/deactivation retransmission MAC CEs, and content transmitted by them may be contradictory. Currently, there is no way to solve problems that how the UE operates correctly when different network nodes transmit different activation/deactivation retransmission MAC CEs. "Duplication Activation/Deactivation MAC CE" (R2-1707921) discusses the duplication activation/deactivation MAC CE. "Design of MAC CE for duplicate activation/deactivation" (R2-1707712) discusses detailed format of MAC CE for duplication activation/deactivation. SUMMARY The present disclosure has solved the afore described problem as defined in the attached claims. An object of the present disclosure is to provide a retransmission activating/deactivating method, a base station, a user equipment and a device, to solve the problem of erroneous operations at the UE caused by misunderstanding at the base station and the UE caused by that different network nodes transmit different MAC CEs for activating/deactivating retransmission in the related art. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of retransmission model under Carrier aggregation (CA) in the related art;FIG. 2 is a schematic diagram of retransmission model under Dual connectivity (DC) in the related art;FIG. 3 is a principle diagram of retransmission performed by multiple base stations in the related art;FIG. 4 is a first flowchart of a retransmission activating/deactivating method according to an embodiment of the present disclosure;FIG. 5 is a first schematic diagram of MAC CE in a retransmission activating/deactivating method according to an embodiment