Multi-Connection Transmission Capability Reporting in 5G UEs
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Solution Overview
Problem
Current multi-connection transmission technologies face challenges in reporting multi-connection transmission capabilities and preventing retransmission of data in 5G wireless communications, particularly in configuring appropriate bearers and avoiding retransmission of successfully received data.
Innovation Solution
The solution involves a method where user equipment (UE) reports its multi-connection transmission capabilities to the base station, allowing the base station to configure appropriate bearers and prevent retransmission by using RRC connection reconfiguration messages and PDCP status reports to confirm successful data delivery across multiple RLC entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication is configured for split bearer to improve reliability, then data transmission reliability is improved, but device complexity increases due to multiple RLC entities and coordination overhead
Solution Approach 1:
The patent segments the data transmission path by introducing multiple RLC entities (first RLC entity and second RLC entity) that operate independently for different data streams. This segmentation allows parallel processing of data through multiple paths while maintaining clear separation of functions, thereby improving reliability without excessive complexity
Solution Approach 2:
The PDCP entity acts as an intermediary that coordinates between multiple RLC entities and the upper layers. It manages the duplication and routing of data packets, tracking which RLC entity has successfully delivered each packet. This intermediary role simplifies the coordination complexity by centralizing the control logic in the PDCP layer
2Productivity
If multi-connection transmission is implemented to improve data transmission efficiency, then productivity is improved, but loss of information increases due to potential retransmission of successfully received data
Solution Approach 1:
The patent implements a feedback mechanism where the PDCP entity receives acknowledgments from multiple RLC entities about successful data delivery. Based on this feedback, the PDCP entity determines whether retransmission is necessary, preventing unnecessary retransmissions of successfully received data while ensuring reliable delivery
Solution Approach 2:
The PDCP entity performs preliminary tracking of which data packets have been successfully delivered through which RLC entity before initiating any retransmission. This preliminary action prevents the retransmission of already successfully delivered packets, avoiding information loss and unnecessary network traffic
3Device complexity
If bearer reconfiguration from split to non-split is performed to reduce complexity, then device complexity is reduced, but loss of time increases due to retransmission of PDCP PDUs
Solution Approach 1:
Before reconfiguring the bearer from split to non-split, the system performs preliminary identification of PDCP PDUs that were transmitted through the secondary RLC entity and have not been confirmed as successfully delivered. This preliminary action ensures that only necessary data is retransmitted after reconfiguration, minimizing retransmission time
Solution Approach 2:
The patent replaces the traditional approach of blanket retransmission after bearer reconfiguration with a selective retransmission mechanism. Instead of retransmitting all PDCP PDUs, the system uses PDCP status reports to identify and retransmit only the specific packets that need retransmission, reducing the time loss associated with reconfiguration
Data Source
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AI summary
The present disclosure provides a method for reporting multi-connection transmission capability, a method for configuring multi-connection transmission modes, a method for preventing retransmission of data, and corresponding user equipment and a base station which support multi-connection transmission. The method for reporting a multi-connection transmission capability comprises: receiving, from a base station, a UE capability query message, the UE capability query message being used to request the UE to send a wireless access capability of the UE for accessing an access network; generating a UE capability information message in response to the received UE capability query message, the UE capability information message being used to indicate the wireless access capability of the UE for accessing the access network and comprising bearer types and/or transmission manners supported by the UE; and sending to the base station the UE capability information message.