Master Base Station Retransmission Control in 5G NR Multi-Connection
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Solution Overview
Problem
In 5G NR multi-connection scenarios, the existing retransmission mechanism is inflexible, leading to significant receiving latency for user equipment due to delayed detection of transmission failures by master base stations, which fails to promptly initiate retransmissions through alternative secondary base stations with better transmission quality.
Innovation Solution
A retransmission processing method and apparatus that allows the master base station to proactively manage transmission status feedback from secondary base stations, enabling timely selection of a more reliable link for retransmission, thereby reducing reordering latency. This involves configuring the PDCP entity to perform retransmissions based on immediate feedback from RLC entities and using a higher-layer inquiry and retransmission mechanism to avoid redundant status reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an existing retransmission mechanism is applied to 5G NR multi-connection scenario, then the secondary base station can send data to user equipment, but the retransmission occasion becomes inflexible and receiving latency increases
Solution Approach 1:
The patent implements dynamic retransmission by allowing the master base station to flexibly select different secondary base stations for retransmission based on real-time transmission quality. The master base station receives feedback from multiple secondary base stations and dynamically determines which secondary base station should perform retransmission, making the retransmission process adaptive rather than static.
Solution Approach 2:
The patent introduces a feedback mechanism where the secondary base station sends feedback information to the master base station about data transmission status. The master base station uses this feedback to determine whether retransmission is needed and which secondary base station should perform the retransmission, enabling closed-loop control for optimized retransmission timing.
2Measurement precision
If the master base station waits for secondary base station feedback, then transmission status can be confirmed, but detection of transmission failure is delayed
Solution Approach 1:
The patent implements preliminary action by having the master base station proactively send inquiry information to the user equipment to check transmission status before waiting for secondary base station feedback. This allows the master base station to detect transmission failures earlier and initiate retransmission procedures without delaying for secondary base station responses.
Data Source
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AI summary
Embodiments of this application disclose a retransmission processing method and apparatus. The method includes: sending, by a master base station, instruction information to a first secondary base station, where the instruction information is used to instruct the first secondary base station to send feedback information to the master base station after the first secondary base station sends data to user equipment; receiving, by the master base station, the feedback information sent by the first secondary base station according to the instruction information; and performing, by the master base station, retransmission processing on the data according to the feedback information. According to the retransmission processing method and apparatus in the embodiments of this application, a status of each link can be obtained in time, and the master base station performs retransmission processing when estimating that a data loss occurs on a link, so that a problem that a receiving latency of the user equipment is relatively large due to an inflexible retransmission occasion can be overcome.