Multiplexing URLLC and eMBB Feedback Codebooks
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently multiplexing feedback codebooks for different service types, such as ultra-reliable low-latency communication (URLLC) and enhanced mobile broadband (eMBB), due to resource collisions and overlapping transmission resources, which can lead to performance degradation and increased signaling overhead.
Innovation Solution
A method where user equipment (UE) determines and encodes separate resource amounts for URLLC and eMBB feedback codebooks based on a multiplexing condition, allowing them to be mapped and transmitted on available resources, including the physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH), with the option to multiplex codebooks if a collision condition is met, prioritizing higher reliability services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate resources are allocated for URLLC and eMBB feedback codebooks, then reliability of URLLC feedback is improved, but resource collision and signaling overhead increase
Solution Approach 1:
The patent combines URLLC feedback codebook and eMBB feedback codebook into a single multiplexed feedback transmission. The UE generates separate codebooks for each service type but multiplexes them together in one PUCCH or PUSCH transmission, eliminating the need for separate resource allocations and reducing resource collision while maintaining reliability through priority-based multiplexing rules.
Solution Approach 2:
The patent creates a universal feedback transmission mechanism that can handle both URLLC and eMBB feedback in a single channel. The multiplexing framework allows the same PUCCH or PUSCH resource to serve multiple service types with different reliability requirements, reducing signaling overhead while maintaining service-specific performance through priority-based resource allocation rules.
2Loss of substance
If feedback codebooks are multiplexed in the same channel, then signaling overhead is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent changes the parameter of feedback transmission by introducing priority-based multiplexing rules that dynamically adjust resource allocation based on service type. The URLLC feedback is assigned higher priority and can preempt eMBB feedback resources when conflicts occur, simplifying the multiplexing decision logic while reducing signaling overhead through unified channel usage.
Solution Approach 2:
The patent implements dynamic resource allocation within the multiplexed feedback framework. The resource allocation is not fixed but adapts based on the presence and priority of different service types. When URLLC feedback is present, it receives preferential treatment in resource allocation, while eMBB feedback uses remaining resources, creating a flexible system that reduces overhead without excessive complexity.
3Reliability
If URLLC feedback is prioritized in resource allocation, then reliability of URLLC service is improved, but performance of eMBB service may degrade
Solution Approach 1:
The patent applies partial prioritization where URLLC feedback receives preferential treatment only when necessary. The multiplexing framework allows eMBB feedback to use available resources when URLLC feedback is absent or when resources are sufficient, ensuring eMBB performance is maintained. URLLC priority is applied partially - only in conflict situations - rather than always, balancing reliability improvement with eMBB performance preservation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A UE may determine resource amounts for transmitting feedback codebook for two different service types based on satisfaction of a multiplexing condition by overlapping resource schedules. The codebooks may be encoded according to different coding rates to generate encoded feedback codebooks. The encoded codebooks may be mapped to transmission resources according to codebook payload sizes, encoding rates, and available resources and transmitted according to the mapping.