RedCap PUCCH Timing for Accurate RACH Response Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately and efficiently transmitting and receiving signals, particularly for user equipment with limited bandwidth, due to insufficient consideration of processing times and time intervals in procedures like Random Access Channel (RACH) and Physical Uplink Control Channel (PUCCH) operations.
Innovation Solution
The method involves configuring a specific minimum time interval for signal transmission and reception, taking into account the processing time of Physical Downlink Shared Channel (PDSCH) and additional time based on user equipment bandwidth limitations, with reduced capability (RedCap) UEs having longer time intervals than standard UEs, to enhance accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard minimum time interval is used for PUCCH transmission after PDSCH reception, then the communication procedure is simple and fast, but UEs with limited bandwidth (RedCap UEs) cannot process the signal accurately due to insufficient processing time
Solution Approach 1:
The patent applies local quality by differentiating the minimum time interval configuration based on UE bandwidth capability. Standard UEs receive a first minimum time interval (e.g., 0.5 msec) while RedCap UEs with limited bandwidth receive a second, longer minimum time interval (e.g., 1 msec or 1.5 msec). This localized adaptation ensures each UE type receives appropriate processing time without unnecessarily delaying standard UEs, thus improving reliability for RedCap UEs while minimizing time loss system-wide.
2Reliability
If the minimum time interval is increased for RedCap UEs to ensure accurate signal processing, then processing reliability improves, but the overall communication efficiency decreases due to longer waiting times
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the minimum time interval parameter based on UE bandwidth capability. The system configures different time interval values (first minimum time interval for standard UEs, second longer minimum time interval for RedCap UEs) according to the specific UE type. This parameter differentiation allows the system to maintain high communication efficiency for standard UEs while ensuring adequate processing time for RedCap UEs, thus resolving the contradiction between reliability and productivity.
3Adaptability or versatility
If a unified time interval configuration is used for all UEs, then the system operation is simple and consistent, but it cannot accommodate the specific processing requirements of RedCap UEs with limited bandwidth
Solution Approach 1:
The patent applies dynamics by making the minimum time interval configuration adaptive rather than static. The system dynamically selects between a first minimum time interval and a second minimum time interval based on the UE's bandwidth capability. This dynamic configuration allows the system to adapt to different UE types (standard UEs and RedCap UEs) without requiring complex manual configuration, as the appropriate time interval is automatically applied based on UE identification and capability reporting.
Data Source
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AI summary
A terminal according to one embodiment can transmit a first message for performing a random access channel (RACH) procedure for a specific cell, receive, from the specific cell, a second message responding to the first message, and transmit, on the basis of a specific minimum time interval, a physical uplink control channel (PUCCH) including a hybrid automatic repeat request-acknowledgement (HARQ-ACK) related to the second message.