High-Priority PUCCH HARQ-ACK Multiplexing for Low-Priority PUSCH Collisions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling collisions between high priority physical uplink control channels (PUCCHs) carrying hybrid automatic repeat request-acks (HARQ-ACKs) and low priority physical uplink shared channels (PUSCHs), particularly when multiple high priority channels overlap, leading to limited communication flexibility and efficiency.
Innovation Solution
The proposed solution involves multiplexing high priority HARQ-ACKs on available orthogonal frequency-division multiplexing (OFDM) symbols of the low priority PUSCH, partially dropping or canceling the low priority channel when necessary, and adhering to specific timing and multiplexing constraints to resolve collisions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high priority PUCCH with HARQ-ACK overlaps with low priority PUSCH, then high priority control information transmission is ensured, but low priority data transmission is disrupted or dropped
Solution Approach 1:
The patent applies partial action by selectively multiplexing only the necessary high priority HARQ-ACK information on the low priority PUSCH resources when overlap occurs, rather than completely dropping the PUSCH. This allows partial utilization of PUSCH resources for control information while preserving remaining resources for data transmission, thus resolving the contradiction between ensuring reliable HARQ-ACK delivery and maintaining PUSCH transmission efficiency
Solution Approach 2:
The patent merges the high priority PUCCH and low priority PUSCH transmissions by multiplexing HARQ-ACK information from the PUCCH onto the PUSCH when they overlap in time. This combining approach allows both control and data transmissions to share the same physical resources, eliminating the need to completely drop either channel and thus resolving the reliability-productivity contradiction
2Reliability
If multiple high priority PUCCHs with HARQ-ACK overlap with low priority PUSCH, then all high priority control information can be transmitted, but low priority data transmission is completely canceled
Solution Approach 1:
The patent applies partial action by determining whether to multiplex or drop PUSCH based on the number of overlapping high priority PUCCHs. When only one PUCCH overlaps, it multiplexes HARQ-ACK on PUSCH; when multiple PUCCHs overlap, it drops PUSCH. This selective approach optimizes the balance between ensuring reliable control information transmission and maintaining data transmission efficiency
Solution Approach 2:
The patent performs preliminary determination of the number of overlapping high priority PUCCHs before deciding on the PUSCH transmission strategy. This advance assessment allows the system to pre-determine whether multiplexing or dropping is the appropriate action, enabling efficient collision resolution before actual transmission occurs and avoiding unnecessary PUSCH cancellations
3Reliability
If low priority PUSCH is partially dropped to transmit high priority HARQ-ACK, then high priority control information is preserved, but PUSCH resource utilization is reduced
Solution Approach 1:
The patent applies partial action by partially dropping the PUSCH only in the time resources occupied by the overlapping high priority PUCCH, while maintaining PUSCH transmission in non-overlapping resources. This selective partial dropping preserves as much PUSCH resource utilization as possible while ensuring high priority HARQ-ACK transmission reliability
Data Source
AI summary
A user equipment (UE) is described. The UE includes circuitry configured to determine that a physical uplink control channel (PUCCH) with high priority (HP) carrying HP hybrid automatic repeat request-acknowledgements (HARQ-ACKs) overlaps with a physical uplink shared channel (PUSCH) with low priority (LP). When only one HP PUCCH with HP HARQ-ACK overlaps with a LP PUSCH, multiplex the HP HARQ-ACK on the LP PUSCH starting from an orthogonal frequency-division multiplexing (OFDM) symbol that is available after a first consecutive demodulation reference signal (DM-RS) OFDM symbol. When more than one HP PUCCH with HP HARQ-ACK overlaps with a LP PUSCH, for each overlapping HP PUCCH carrying the HP HARQ-ACK, multiplex a corresponding HP HARQ-ACK on confined symbols of the LP PUSCH.