Multiplexing URLLC and eMBB HARQ-ACK on PUSCH via DMRS Positioning
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Solution Overview
Problem
Current communication systems face limitations in flexibility and efficiency when multiplexing hybrid automatic repeat request-acknowledgment (HARQ-ACK) for ultra-reliable low-latency communication (URLLC) and enhanced mobile broadband (eMBB) on a single physical uplink shared channel (PUSCH), particularly due to timing and resource allocation constraints.
Innovation Solution
The system determines overlap between URLLC and eMBB physical uplink control channels (PUCCH) with the eMBB physical uplink shared channel (PUSCH), enabling multiplexing of both URLLC and eMBB uplink control information (UCI) where URLLC UCI starts immediately after a set of demodulation reference symbols (DMRS) in the eMBB PUSCH, and employs specific beta offset values and coding methods to manage HARQ-ACK and CSI multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If URLLC and eMBB PUCCH channels are separately transmitted, then reliability of URLLC is maintained, but resource efficiency and network capacity are reduced
Solution Approach 1:
The patent combines URLLC UCI and eMBB UCI transmissions onto a single eMBB PUSCH channel. The higher layer processor determines multiplexing of both URLLC UCI and eMBB UCI on the eMBB PUSCH, where the URLLC UCI starts immediately after a first set of demodulation reference symbols (DMRS) in the eMBB PUSCH. This merging approach improves resource efficiency while maintaining URLLC reliability through priority-based multiplexing.
2Productivity
If URLLC and eMBB UCI are multiplexed on the same PUSCH, then resource efficiency is improved, but timing and resource allocation complexity increases
Solution Approach 1:
The patent segments the PUSCH transmission into distinct regions: DMRS symbols followed by URLLC UCI, then eMBB UCI. The URLLC UCI starts immediately after a first set of DMRS in the eMBB PUSCH, creating a structured segmentation that simplifies the multiplexing process while maintaining resource efficiency.
Solution Approach 2:
The patent applies different quality requirements to different parts of the multiplexed transmission. URLLC UCI is given priority placement immediately after DMRS with specific beta offset values to ensure its reliability, while eMBB UCI occupies remaining resources. This local quality differentiation manages complexity by applying service-specific requirements only where needed.
3Loss of time
If URLLC UCI is placed after DMRS in eMBB PUSCH, then URLLC timing requirements are met, but eMBB resource allocation flexibility is reduced
Solution Approach 1:
The patent performs preliminary placement of URLLC UCI immediately after DMRS symbols in the PUSCH structure. This preliminary action ensures URLLC timing requirements are met by reserving the region right after DMRS for URLLC UCI before finalizing eMBB resource allocation. The higher layer processor determines this placement in advance, reducing latency while allowing eMBB to adapt to remaining resources.
Data Source
AI summary
A user equipment (UE) is described. The UE includes a higher layer processor configured to determine that a physical uplink control channel (PUCCH) for hybrid automatic repeat request-acknowledgment (HARQ-ACK) of ultra-reliable low-latency communication (URLLC) and a PUCCH for uplink control information (UCI) of enhanced mobile broadband (eMBB) overlap with an enhanced mobile broadband (eMBB) physical uplink shared channel (PUSCH). The higher layer processor is also configured to determine multiplexing of both URLLC UCI and eMBB UCI on the eMBB PUSCH, where the URLLC UCI starts immediately after a first set of demodulation reference symbols (DMRS) in the eMBB PUSCH. The UE also includes transmitting circuitry configured to perform the multiplexing of the URLLC UCI and the eMBB UCI jointly on the eMBB PUSCH.