SR Multiplexing on PUSCH for Wireless Uplink Control
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in handling scheduling requests (SR) multiplexing on physical uplink shared channels (PUSCH), leading to issues such as channel dropping and overhead in reporting high-priority SRs, which can result in the loss of important data like high-priority HARQ-ACKs when low-priority PUSCH is dropped.
Innovation Solution
The implementation of a user equipment (UE) and base station (gNB) processor configuration to determine SR multiplexing based on radio resource control (RRC) parameters, enabling the transmission or reception of low-priority PUSCH with or without negative SR multiplexing, and allowing positive HP SR multiplexing on LP PUSCH if delay requirements are met, thereby avoiding channel dropping and enabling simultaneous reporting of high-priority SR and UCI on PUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-priority SR is multiplexed on low-priority PUSCH, then reporting efficiency of critical data is improved, but channel dropping behavior becomes more complex
Solution Approach 1:
The patent introduces RRC parameters (sr-Pusch-Multiplexing, sr-Pusch-Multiplexingv2) to control SR multiplexing behavior on PUSCH. By changing the parameter state (enabled/disabled) based on priority levels and overlap conditions, the system efficiently reports critical SR data while managing channel dropping complexity through configurable parameters.
2Reliability
If low-priority PUSCH is dropped due to HP SR overlap, then SR reporting is ensured, but data transmission reliability deteriorates
Solution Approach 1:
The patent implements dynamic channel dropping behavior where the decision to drop PUSCH or PUCCH is not fixed but adapts based on priority levels, overlap conditions, and RRC parameter configurations. This dynamic approach ensures SR reporting reliability while minimizing data loss by selectively dropping only when necessary and appropriate.
Solution Approach 2:
The system performs preliminary evaluation of overlap conditions between PUCCH and PUSCH before transmission. By checking timing relationships and priority levels in advance, the system determines the appropriate dropping behavior, ensuring SR reporting is maintained while protecting important data transmission.
3Adaptability or versatility
If SR multiplexing on PUSCH is enabled, then communication flexibility is improved, but system complexity increases
Solution Approach 1:
The patent segments SR multiplexing functionality into distinct priority levels (high-priority and low-priority) with separate RRC parameters controlling each. This segmentation allows flexible communication by enabling SR multiplexing where needed while maintaining simpler behavior elsewhere, thereby managing system complexity through modular configuration.
4Ease of operation
If overlapping PUCCH and PUSCH are handled by dropping one channel, then resource conflict is resolved, but overhead increases due to retransmission
Solution Approach 1:
The patent implements self-service mechanisms where the UE autonomously evaluates overlap conditions, determines priority relationships, and makes dropping decisions without requiring network intervention or retransmission protocols. This self-service approach resolves resource conflicts efficiently while minimizing overhead by avoiding unnecessary retransmissions.
Data Source
AI summary
A user equipment (UE) is described. The UE includes a processor configured to determine, based on a radio resource control (RRC) parameter, scheduling request (SR) multiplexing on a physical uplink shared channel (PUSCH). The UE also includes transmitting circuitry configured to, if at least one physical uplink control channel (PUCCH) for high priority (HP) SR overlaps with a low priority (LP) PUSCH, and if HP SR multiplexing on low priority (LP) PUSCH is configured and enabled, and if there is no positive HP SR, transmit the LP PUSCH with or without negative SR multiplexing.