Wireless RLC PDU Relay for Low-Latency TN and NTN Handover
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Solution Overview
Problem
High-latency networks, such as those in non-terrestrial networks (NTN), experience increased transmission latency and handover frequency due to larger cell coverage areas and greater transmission distances, leading to poor link quality and increased retransmissions, which disrupt service continuity.
Innovation Solution
A method for data transmission in wireless communication systems that involves cooperation between a first and a second base station, where the first base station operates a radio signal carrying a portion of an RLC PDU associated with a bearer that terminates at the second base station, allowing data from higher protocol layers to be mapped to lower protocol layers of a low-latency base station, thereby reducing transmission latency and ensuring coverage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If NTN cells are used as PCell to reduce handover frequency, then coverage area is improved, but transmission latency increases
Solution Approach 1:
The RLC PDU is segmented into multiple parts, with different parts transmitted through different base stations (TN and NTN). This allows the data to utilize both the low-latency TN path and the high-coverage NTN path simultaneously, resolving the contradiction between coverage area and transmission latency.
Solution Approach 2:
The first base station acts as an intermediary that receives and transmits a portion of the RLC PDU to the UE. This intermediary approach enables coordinated transmission between TN and NTN base stations, allowing the system to leverage both networks' advantages without being constrained by the latency of direct NTN communication.
2Area of stationary object
If transmission distance is increased to achieve larger coverage, then coverage area is improved, but link quality deteriorates
Solution Approach 1:
The RLC PDU transmission is divided into multiple segments handled by different base stations. By segmenting the data flow, the system can use the reliable short-distance TN link for part of the data and the long-distance NTN link for another part, thereby maintaining overall link quality while extending coverage.
Solution Approach 2:
The system dynamically adjusts transmission parameters by selecting which parts of the RLC PDU to transmit through which base station based on current link conditions. This parameter optimization allows the system to maintain high link quality by adapting to varying channel conditions in real-time.
Data Source
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AI summary
Disclosed in the present application are a method and apparatus used in a communication node for wireless communication. The method comprises: a communication node operating a first radio signal on a first cell of a first base station, wherein the first radio signal carries at least a portion of bits of a first RLC PDU; the operation is reception, or the operation is transmission; and the first RLC PDU is associated with a first RLC bearer, and the first RLC bearer terminates at a second base station other than the first base station. Regarding the problem of data packet transmission based on multi-base-station cooperation, the present application provides a scheme for transmitting, by means of a first base station, an RLC PDU generated by a second base station. The scheme improves the quality of communication.