Uplink Control Information Transmission With Colliding PUSCH
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Solution Overview
Problem
The existing 3GPP Rel-15 wireless communication standard does not effectively support different priorities in physical channels for various uplink control information (UCI) types, leading to collisions and inefficiencies in the transmission of UCI, particularly when PUCCH and PUSCH resources overlap, which can impact low-latency and high-reliability communications.
Innovation Solution
The method involves determining overlaps in time between PUCCH and PUSCH resources and either combining or disregarding UCI based on priority levels, using techniques such as concatenation and multiplexing with beta factors, to resolve collisions and optimize transmission within a slot, ensuring that higher-priority UCI is transmitted while lower-priority UCI may be omitted or transmitted only partially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH and PUSCH resources are allocated simultaneously without priority differentiation, then resource utilization is maximized, but transmission reliability deteriorates due to collisions between different UCI types
Solution Approach 1:
The patent segments UCI into different priority levels (first priority and second priority), allowing separate handling of critical and non-critical control information. This segmentation enables the system to prioritize HARQ-ACK and CSI reports over scheduling requests, resolving collisions by treating different UCI types differently based on their importance to transmission reliability.
Solution Approach 2:
The patent introduces priority parameters to differentiate UCI types, changing the resource allocation parameters from uniform to priority-based. By assigning different priority levels to different UCI types, the system can dynamically adjust resource allocation during collisions, improving transmission reliability without requiring completely new resource management mechanisms.
2Productivity
If all UCI types are transmitted with equal priority, then transmission completeness is improved, but latency increases due to unresolved collisions and retransmissions
Solution Approach 1:
The patent performs preliminary prioritization of UCI types before resource allocation, determining which UCI should be transmitted first based on pre-defined priority rules. This preliminary action prevents collisions from causing retransmissions by ensuring critical UCI (like HARQ-ACK) is always transmitted on time, thereby reducing latency without sacrificing transmission completeness.
Solution Approach 2:
The patent allows lower-priority UCI to be skipped or delayed when resources are unavailable, rushing through the transmission of high-priority UCI first. This skipping mechanism ensures that critical control information is transmitted without delay even if it means postponing less critical UCI, thereby improving overall transmission efficiency and reducing latency.
3Productivity
If PUSCH is used to carry UCI, then resource utilization is improved, but control information reliability deteriorates due to shared channel interference
Solution Approach 1:
The patent applies local quality by ensuring that even when UCI is multiplexed on PUSCH, high-priority UCI (first priority) receives sufficient protection and resources within the shared channel. By differentiating resource allocation quality based on UCI priority, the system maintains control information reliability for critical data while still utilizing the PUSCH for resource efficiency.
Solution Approach 2:
The patent introduces priority levels as an intermediary mechanism between PUSCH resource allocation and UCI transmission reliability. This intermediary allows the system to mediate the conflict between shared channel usage and control information protection, ensuring that high-priority UCI is adequately protected even when multiplexed on the shared PUSCH channel.
Data Source
AI summary
A method and apparatus are disclosed for transmission of one or more UCIs with colliding PUSCH. In one embodiment, a method implemented in a wireless device (WD) is provided. The method includes determining a first uplink control information (UCI) and a second UCI, the first UCI associated with a first physical uplink control channel (PUCCH) and the second UCI associated with a second PUCCH; and combining the first UCI and the second UCI and/or disregarding at least one of the first UCI and the second UCI and/or transmitting at least one of the first UCI and the second UCI in a time resource.