Msg3 Repetition Resources for Joint Channel Estimation
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining uplink continuity and efficient joint channel estimation for Msg3 repetitions, particularly in scenarios involving contention-free random access (CFRA) channels, which affect the reliability and efficiency of data transmission.
Innovation Solution
The implementation of a method and apparatus for a user equipment (UE) and network entity to transmit and receive indications and capabilities for maintaining uplink continuity of Msg3 and CFRA channel repetitions, enabling joint channel estimation through the exchange of specific resources and PRACH messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Msg3 repetitions are transmitted to improve uplink reliability, then transmission reliability is improved, but channel estimation accuracy deteriorates due to discontinuous uplink transmission
Solution Approach 1:
The network entity pre-configures the UE with repetition indication information before Msg3 transmission. This allows the UE to proactively maintain uplink continuity by applying the indicated repetition pattern to Msg3 repetitions, ensuring both reliable transmission and continuous uplink signal for accurate channel estimation.
Solution Approach 2:
The network entity receives capability information from the UE regarding uplink continuity maintenance and adjusts the repetition indication information accordingly. This feedback mechanism ensures that the repetition strategy is optimized based on actual UE capabilities, achieving both transmission reliability and channel estimation accuracy.
2Measurement precision
If joint channel estimation is performed on Msg3 repetitions to improve estimation accuracy, then measurement precision is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The UE autonomously performs joint channel estimation on Msg3 repetitions using the configured repetition indication information, without requiring complex network-side processing. The network entity only needs to configure and receive results, significantly reducing overall system complexity while achieving accurate channel estimation.
3Reliability
If uplink continuity is maintained for CFRA channel repetitions to improve reliability, then transmission reliability is improved, but loss of time increases due to extended transmission duration
Solution Approach 1:
The system dynamically adjusts the CFRA channel repetition pattern based on real-time channel conditions and UE capabilities. The network entity can flexibly configure the repetition indication information to optimize the balance between transmission reliability and time efficiency, adapting to varying operational requirements.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an indication of a UE capability of the UE for maintaining uplink continuity of Msg3 repetitions. The UE may receive a configuration specifying resources that indicate Msg3 repetition is to be expected. The UE may transmit a physical random access channel (PRACH) message in the resources. The resources may include preamble resources that are dedicated for joint channel estimation of Msg3 repetitions or for joint channel estimation of PRACH repetitions. Numerous other aspects are described.