PDSCH Processing Timing for Uplink Tx Switching Margins
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Solution Overview
Problem
Current wireless communication systems do not adequately account for the additional processing time required for uplink transmit switching, leading to insufficient timing margins for hybrid automatic repeat request acknowledgment (HARQ-ACK) in physical downlink shared channel (PDSCH) processing, particularly in worst-case scenarios.
Innovation Solution
The PDSCH processing time is relaxed by incorporating the uplink transmit switching processing time (Tswitch) into the PDSCH processing time calculation, either by using Tswitch directly or introducing a new gap (Tswitch,PDSCH), with new UE capability reporting to indicate this relaxation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PDSCH processing time is calculated without incorporating uplink transmit switching processing time, then the processing time calculation is simple and fast, but the timing margin for HARQ-ACK transmission becomes insufficient in worst-case scenarios
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple PDSCH processing time values (first PDSCH processing time value and second PDSCH processing time value) that already incorporate the uplink transmit switching processing time. The UE capability reporting mechanism预先 establishes the required processing time margins before actual PDSCH reception occurs, ensuring sufficient timing for HARQ-ACK transmission even in worst-case scenarios where uplink transmit switching is needed.
2Reliability
If the PDSCH processing time is relaxed to account for uplink transmit switching, then the timing margin for HARQ-ACK transmission is sufficient, but the processing time increases
Solution Approach 1:
The patent implements dynamics by making the PDSCH processing time adaptive rather than fixed. The network device selects between a first PDSCH processing time value (longer, accounting for uplink transmit switching) and a second PDSCH processing time value (shorter, for cases where switching is not needed) based on actual UE capability reporting and specific transmission scenarios. This dynamic adjustment ensures sufficient timing margin only when necessary, optimizing overall system performance.
Data Source
AI summary
Systems and methods for physical downlink shared channel (PDSCH) processing time enhancement to support uplink (UL) transmit (Tx) switching are described. In some embodiments, a PDSCH processing time, Tproc,1, is determined using an UL Tx switch processing time, Tswitch, corresponding to a physical uplink shared channel (PUSCH) preparation time, Tproc,2, used at a UE. In some embodiments, a Tproc,1 is determined using a PDSCH UL Tx switch processing time, Tswitch,PDSCH, that is determined using a Tswitch corresponding to a Tproc,2 used at a UE. In some embodiments, a Tproc,2 is compared to a time between an end of a downlink control information (DCI) scheduling a PDSCH and a beginning of a physical uplink control channel (PUCCH) having hybrid automatic repeat request acknowledgement (HARQ-ACK) signaling for a PDSCH to determine treatment of the PUCCH. In some embodiments, a d1,1 component of Tproc,1 is relaxed based on a Tswitch.