Multiplexing High Priority HARQ-ACK on Low Priority PUSCH
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently and flexibly managing collisions between high priority physical uplink control channels (PUCCHs) carrying hybrid automatic repeat request-acks (HARQ-ACKs) and low priority physical uplink shared channels (PUSCH), particularly in scenarios where multiple high priority PUCCHs overlap with a low priority PUSCH.
Innovation Solution
The system employs circuitry in user equipment (UE) and base stations (gNB) to determine overlapping channels, allowing for the multiplexing of high priority HARQ-ACKs on the low priority PUSCH, starting from available orthogonal frequency-division multiplexing (OFDM) symbols after demodulation reference signals, and for multiple overlapping PUCCHs, multiplexing each HARQ-ACK on confined symbols, while also considering channel dropping and joint coding to manage overlapping transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple high priority PUCCHs are transmitted simultaneously, then reliability of control information is improved, but collision with low priority PUSCH occurs causing resource conflict
Solution Approach 1:
The patent applies local quality by differentiating treatment of high priority and low priority channels in different time-frequency regions. When a high priority PUCCH overlaps with a low priority PUSCH, the high priority channel is allowed to multiplex its HARQ-ACK onto the low priority PUSCH resources, while the low priority data transmission is dropped or postponed. This localized resource allocation resolves the collision by giving priority to control information in the overlapping region while maintaining overall system reliability.
2Productivity
If high priority HARQ-ACK is multiplexed on low priority PUSCH, then resource utilization is improved, but complexity of channel management increases
Solution Approach 1:
The patent changes the priority parameter of channel transmissions dynamically. When a high priority PUCCH carrying HARQ-ACK overlaps with a low priority PUSCH, the system reassigns the low priority PUSCH resources to carry the high priority control information. This parameter change in channel priority and resource allocation improves resource utilization by eliminating wasted resources, while the complexity increase is managed through standardized multiplexing procedures defined in the communication protocol.
3Ease of manufacture
If channel dropping is used to resolve collisions, then implementation simplicity is improved, but loss of data transmission occurs
Solution Approach 1:
The patent applies preliminary action by proactively multiplexing the high priority HARQ-ACK onto the low priority PUSCH before the collision occurs. The UE identifies the overlapping channels in advance and prepares the multiplexed transmission, combining the control information with the data transmission in a single uplink message. This preliminary multiplexing action prevents the need for last-minute channel dropping decisions, thereby reducing data loss while maintaining implementation feasibility through standardized procedures.
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). Multiplex HIP HARQ-ACK symbols no later than an ending symbol of the HP PUCCH.