Uplink Cancellation Offset Value for Timing Alignment
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Solution Overview
Problem
Current wireless communication technologies face challenges in efficiently managing uplink cancellations due to timing differences between base stations and user equipment, leading to interference and reduced reliability in high-priority communications.
Innovation Solution
The introduction of an offset value to determine reference uplink resources for cancellation indications, accounting for timing advance and propagation delays, allows user equipment to adjust transmit times and avoid interference by shifting the start of cancellation resources, thereby enhancing the reliability and reducing latency of uplink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink cancellation indications are transmitted without accounting for timing advance and propagation delays, then the system operation is simple, but interference occurs between uplink communications and high-priority communications
Solution Approach 1:
The base station pre-configures offset values to UEs before uplink cancellation is needed. These offset values are calculated in advance based on timing advance and propagation delay characteristics, allowing the UE to accurately determine cancellation resources without real-time complex calculations when cancellation indications are received
Solution Approach 2:
An offset value acts as an intermediary parameter that bridges the timing difference between base station and UE. This offset value simplifies the determination of reference uplink resources by accounting for propagation delays and timing advance in a single pre-calculated parameter, avoiding complex real-time timing calculations
2Reliability
If reference uplink resources are determined without offset values, then the determination process is fast, but timing misalignment causes interference with high-priority communications
Solution Approach 1:
Offset values are pre-configured by the base station before uplink cancellation operations are performed. This preliminary calculation of offset values based on timing advance and propagation delay characteristics enables fast, accurate cancellation resource determination without real-time complex timing calculations
Solution Approach 2:
The system introduces offset values as an additional parameter in the uplink cancellation indication. This parameter encapsulates timing advance and propagation delay information, transforming a complex timing alignment problem into a simple parameter addition that the UE can process quickly
3Loss of time
If timing advance and propagation delays are not considered, then the system operation is simple, but latency increases due to retransmissions and interference resolution
Solution Approach 1:
The patent introduces offset values as a new parameter in uplink cancellation indications. These offset values encapsulate timing advance and propagation delay characteristics, allowing the UE to accurately determine cancellation resources with simple arithmetic operations, thereby reducing latency without requiring complex timing management procedures
Solution Approach 2:
The offset value serves as an intermediary that pre-computes timing adjustments for uplink cancellation. By incorporating timing advance and propagation delay information into this single parameter, the system avoids complex real-time timing calculations and reduces the latency associated with timing misalignment and subsequent retransmissions
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine an offset value to be used to determine reference uplink resources associated with uplink cancellation indications; receive an uplink cancellation indication; and cancel an uplink communication in a set of reference uplink resources, wherein the set of reference uplink resources are determined based at least in part on the offset value and a time domain resource in which the uplink cancellation indication is received. Numerous other aspects are provided.