UE HARQ-ACK Timing for Relaxed Downlink Processing
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Solution Overview
Problem
Existing wireless communication systems face limitations in communication flexibility and efficiency, particularly in managing reduced processing capabilities and decoding times for user equipment (UE) in downlink transmissions.
Innovation Solution
Implementing a system where user equipment (UE) and base stations exchange RRC messages to indicate reduced processing capabilities, numerology, scaling factors, and decoding time offsets to ensure valid Hybrid Automatic Repeat Request-ACK (HARQ-ACK) messages are transmitted at appropriate times, defined by a predefined table, allowing for flexible and efficient downlink processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reduced UE processing capability is implemented, then UE complexity is reduced, but downlink processing time increases
Solution Approach 1:
The patent applies parameter changes by introducing multiple processing capability levels (first, second, third processing capabilities) and associated parameters (Tproc,1, Tproc,2, Tproc,3) that allow the UE to operate with reduced processing requirements. The base station can configure different processing time parameters based on the UE's capability level, thereby reducing UE complexity while managing the trade-off in processing time through systematic parameter adjustment.
2Adaptability or versatility
If flexible processing time configuration is implemented, then communication flexibility improves, but system complexity increases
Solution Approach 1:
The patent implements dynamics by enabling flexible configuration of processing time parameters (Tproc,1, Tproc,2, Tproc,3) and slot offsets through RRC signaling. The system can dynamically adjust these parameters based on UE capability reports and network requirements, allowing adaptive control of processing timelines. This dynamic configuration approach enhances communication flexibility while managing system complexity through structured parameter sets and predefined tables.
Data Source
AI summary
A user equipment (UE) is described. The UE receives an RRC message comprising first information used for indicating a reduced UE processing capability from a set of multiple reduced UE processing capabilities; receives an RRC message comprising second information used for indicating a numerology for a PDSCH transmission; receives an RRC message comprising third information used for indicating a scaling factor for reduced UE PDSCH decoding time; and receives an RRC message comprising fourth information used for indicating an offset for reduced UE PDSCH decoding time. The UE also transmits, to the base station, a valid HARQ-ACK message if the first uplink symbol of a PUCCH which carries the HARQ-ACK information starts no earlier than at symbol X, the symbol X being defined as the next uplink symbol with its CP starting after Tproc,1,relaxed after the end of the last symbol of the PDSCH carrying a TB being acknowledged.