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Retransmission indication method, base station and terminal
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A technology of repeated transmission and transmission mode, applied in the field of communication
Active Publication Date: 2020-06-02
DATANG MOBILE COMM EQUIP CO LTD
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[0006] Embodiments of the present invention provide a repeated transmission indication method, a base station, and a terminal to solve the problem of how to activate repeated transmission when the terminal is configured with dual connectivity DC repeated transmission and CA repeated transmission at the same time
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Embodiment 1
[0182] Embodiment 1: Activating DC Repeated Transmission
[0184] Step 1: The base station uses RRC signaling to configure the DC retransmission and CA retransmission for the RB for the terminal. The configuration content includes: the default RLC entity under the primary cell group MCG and the secondary cell group SCG, and each RLC entity is under CA retransmission carrier limitation.
[0185] Optionally, the configuration content further includes: deactivating a default RLC entity during repeated transmission.
[0186] Step 2: the base station sends the first MAC CE to the terminal, which is used to activate the repeated DC transmission of the specified RB.
[0187] Step 3: The base station receives data transmission on the default RLC entity corresponding to the specified RB in the MCG and SCG.
[0188]Terminal side:
[0189] Step 1: The terminal receives the RRC signaling sent by the base station, and determines the DC retransmission and CA ...
Embodiment 2
[0192] Example 2: Activating CA Repeated Transmission 1
[0194] Step 1: The base station uses RRC signaling to configure DC retransmission and CA retransmission for the terminal for the RB. The configuration content includes: default RLC entities under MCG and SCG, and carrier restrictions of each RLC entity under CA retransmission.
[0195] Optionally, the configuration content further includes: deactivating a default RLC entity during repeated transmission. Wherein, the RB corresponds to one RLC entity on CG1 (MCG or SCG), and corresponds to two RLC entities on CG2 (SCG or MCG).
[0196] Step 2: The base station corresponding to CG1 sends the first MAC CE to the terminal, and the first MAC CE indicates to activate CA repeat transmission for the RB, and then deactivate the repeat transmission (because CG1 only corresponds to one RLC entity).
[0197] Step 3: The base station receives the uplink data transmission of the RB on the RLC entity corre...
Embodiment 3
[0206] Example 3: Activating CA Repeated Transmission 2
[0208] Step 1: The base station uses RRC signaling to configure DC retransmission and CA retransmission for the terminal for the RB. The configuration content includes: default RLC entities under MCG and SCG, and carrier restrictions of each RLC entity under CA retransmission.
[0209] Optionally, the configuration content further includes: deactivating a default RLC entity during repeated transmission. Wherein, the RB corresponds to one RLC entity on CG1 (MCG or SCG), and corresponds to two RLC entities on CG2 (SCG or MCG).
[0210] Step 2: The base station corresponding to CG1 or the base station corresponding to CG2 sends the first MAC CE to the terminal, which is used to instruct to activate the CA repeat transmission of the RB.
[0211] Step 3: The base station receives the CA retransmission data of the RB sent by the terminal on CG2.
[0212] Terminal side:
[0213] Step 1: The term...
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Abstract
The invention provides a retransmission indication method, a base station and a terminal which are used to solve the problem of how to activate retransmission under the condition that the terminal issimultaneously configured with dual-connection DC retransmission and CA retransmission. The method of the present invention comprises the following steps: generating first media access control MAC control unit information, wherein the first MAC control unit information is used for indicating whether dual-connection DC retransmission or carrier aggregation CA retransmission is activated by a targetradio bearer RB, the target RB corresponds to one or two radio link layer control protocol RLC entities in each target cell group, and the target cell group is a cell group corresponding to the terminal; sending the first MAC control unit information to the terminal. According to the method disclosed in the embodiment of the invention, effective retransmission activation can be carried out through relatively low signaling overhead, namely the first MAC control unit with one byte, so that activation signaling resources and air interface resources for retransmission can be effectively saved, and continuity and compatibility of protocol design can be guaranteed.
Description
technical field [0001] The present invention relates to the field of communication technology, in particular to a repeated transmission instruction method, a base station and a terminal. Background technique [0002] The 5G New Radio (NR) system has relatively high requirements for low-latency and high-reliability services in terms of delay and reliability. At present, a repeated transmission mechanism is introduced, that is, the same packet data aggregation protocol is transmitted through multiple paths Layer Protocol Data Unit (Packet Data Convergence Protocol Protocol Data Unit, PDCP PDU), through multi-channel transmission gain to improve transmission reliability and reduce transmission delay. [0003] In the NR Rel-15 phase, only two-way repeated transmission is supported, that is, a PDCP entity corresponding to a radio bearer (RB) is mapped to two Radio Link Control (RLC) entities. By configuring The two paths only implement dual connectivity (Dual Connectivity, DC) r...
Claims
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Application Information
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