Uplink Channel Transmission Parameter Configuration for Unlicensed Band Latency
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Solution Overview
Problem
In wireless communications, devices sharing an unlicensed band face challenges in determining optimal transmission resources due to the dynamic idle or busy state of channels, leading to latency and reliability issues in sending uplink channels.
Innovation Solution
A channel sending method and device that determine a first transmission parameter, including time domain resources, redundancy versions (RV), or hybrid automatic repeat request (HARQ) process numbers, to ensure low latency and high reliability in sending uplink channels by identifying suitable candidate transmission opportunities and RV sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices share an unlicensed band following specific rules, then channel access fairness is improved, but transmission latency increases due to dynamic channel state checking
Solution Approach 1:
The network device pre-determines and configures multiple candidate transmission opportunities and their corresponding transmission parameters (RV sequences, HARQ process numbers) to the terminal device before actual transmission. This preliminary configuration allows the terminal to quickly select and use appropriate parameters without real-time channel state checking, reducing transmission latency while maintaining fair channel access through pre-coordinated resource allocation.
2Reliability
If transmission parameters are determined dynamically based on channel state, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The network device pre-configures multiple candidate transmission opportunities with different transmission parameters (RV sequences, HARQ process numbers) based on predicted channel conditions. The terminal device simply selects from these pre-configured options based on current channel state, avoiding complex real-time parameter calculation while maintaining transmission reliability through diverse pre-prepared parameter sets.
Solution Approach 2:
The transmission resource is divided into multiple candidate transmission opportunities, each with specific transmission parameters. This segmentation allows the system to provide multiple predefined options rather than calculating parameters dynamically, reducing system complexity while maintaining the ability to adapt to different channel conditions through selective usage of segmented resources.
3Adaptability or versatility
If multiple candidate transmission opportunities are configured, then transmission flexibility is improved, but resource overhead increases
Solution Approach 1:
The network device configures multiple candidate transmission opportunities with different transmission parameters, but the terminal device only activates and uses the specific candidate that corresponds to the current channel state. This partial usage approach provides transmission flexibility through multiple configured options while avoiding the resource overhead of actively maintaining and monitoring all candidate opportunities continuously.
Data Source
AI summary
A channel sending method includes: determining a first transmission parameter, where the first transmission parameter includes at least one of following: a time domain resource, an RV, or a HARQ process number, the time domain resource includes at least one of N candidate transmission opportunities, and the N candidate transmission opportunities correspond to M uplink channels; and sending P uplink channels based on the first transmission parameter. N, M, and P are all positive integers.