Multiplexing Sidelink Feedback on High Priority PUSCH
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Solution Overview
Problem
In wireless communication systems, the overlap of physical uplink control channel (PUCCH) resources with high priority physical uplink shared channel (PUSCH) resources leads to ambiguity at the base station regarding sidelink HARQ-ACK feedback multiplexing, resulting in increased computational cost, complexity, and latency due to multiple decoding hypotheses.
Innovation Solution
The user equipment (UE) conditionally multiplexes sidelink feedback with uplink data messages based on parameters, explicit indications from the base station, or multiplexing rules, allowing for sidelink HARQ-ACK feedback to be transmitted on high priority PUSCH resources if certain conditions are met, such as a parameter value satisfying a threshold or overlapping with low priority PUSCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station receives sidelink HARQ-ACK feedback on PUCCH resources that overlap with high priority PUSCH resources, then the feedback transmission is maintained, but the base station experiences increased computational cost and latency due to multiple decoding hypotheses
Solution Approach 1:
The base station sends a second signal (e.g., DCI format 0_2 or 0_1) before the feedback transmission to pre-indicate whether sidelink HARQ-ACK feedback can be multiplexed on the high priority PUSCH. This preliminary indication allows the UE to determine the appropriate transmission behavior in advance, eliminating the need for the base station to prepare multiple decoding hypotheses and reducing computational complexity while maintaining feedback reliability
Solution Approach 2:
A second control signal acts as an intermediary between the base station's scheduling decision and the UE's feedback transmission. This intermediary signal carries the multiplexing indication that resolves the ambiguity, allowing the base station to receive feedback without needing to evaluate multiple decoding scenarios, thus reducing complexity while preserving transmission reliability
2Reliability
If the UE transmits sidelink HARQ-ACK feedback on PUCCH resources overlapping with high priority PUSCH resources, then the feedback is transmitted, but the system experiences increased latency due to multiple decoding hypotheses at the base station
Solution Approach 1:
The base station provides a preliminary indication via a second signal before the feedback transmission occurs. This advance notification allows the UE to prepare the appropriate transmission format, enabling the base station to decode the feedback immediately upon reception without needing to evaluate multiple hypotheses, thereby reducing decoding latency while maintaining transmission reliability
Solution Approach 2:
The system implements a feedback mechanism where the base station's second signal provides guidance to the UE about multiplexing conditions. This feedback loop ensures that the UE transmits feedback in a format that the base station can efficiently decode, reducing latency while preserving reliability through coordinated transmission behavior
3Ease of manufacture
If the base station schedules PUCCH resources for sidelink feedback without considering PUSCH overlaps, then resource allocation is simple, but ambiguity arises regarding feedback multiplexing on high priority PUSCH
Solution Approach 1:
A second control signal serves as an intermediary that carries multiplexing indication information from the base station to the UE. This intermediary resolves the information loss by explicitly indicating whether feedback can be multiplexed on high priority PUSCH, maintaining resource allocation simplicity while eliminating ambiguity through additional control information
Solution Approach 2:
The system changes the parameter state by introducing a new control signal with specific multiplexing indication information. This parameter change (adding the second signal) resolves the information loss about feedback multiplexing clarity without fundamentally changing the resource allocation process, maintaining simplicity while providing necessary guidance
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may receive scheduling information that schedules an uplink data message over a high priority physical uplink shared channel (PUSCH) that overlaps in time with a physical uplink control channel (PUCCH) resource over which the UE is scheduled to transmit feedback associated with sidelink communication. The UE may receive signaling from a base station indicating whether the feedback associated with the sidelink communication can be multiplexed with the uplink data message on the high priority PUSCH. As such, the UE may multiplex the feedback associated with the sidelink communication on the high priority PUSCH if the signaling from the base station indicates that the feedback associated with the sidelink communication can be multiplexed with the uplink data message on the high priority PUSCH.