NR-U Channel Occupancy Coordination for Terminal-Initiated COT
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Solution Overview
Problem
In New Radio-based access to unlicensed spectrum (NR-U) systems, there is a challenge in ensuring the reasonable coexistence of channel occupancy times (COT) initiated by both network and terminal devices, as current systems only support COT initiation by the network device, limiting communication performance.
Innovation Solution
The terminal device determines and initiates a first periodic channel occupancy, allowing it to independently manage its COT, using configuration information provided by the network device to avoid collisions and ensure fair spectrum usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network device initiates COT on unlicensed spectrum, then the network device can control channel access, but the terminal device cannot independently initiate COT limiting communication performance
Solution Approach 1:
The patent segments the COT initiation right by introducing two separate periodic channel occupancies: one for network device initiation and one for terminal device initiation. This allows the terminal device to independently initiate COT while the network device maintains its own initiation capability, resolving the contradiction between terminal adaptability and system complexity by dividing the channel access control into distinct segments for different devices.
2Productivity
If the terminal device initiates COT independently, then communication performance improves, but collision between network and terminal COT may occur
Solution Approach 1:
The patent applies preliminary action by having the terminal device determine the first periodic channel occupancy in advance before actual transmission. The terminal device uses configuration information (such as periodicity, offset, and duration) to pre-establish its COT initiation parameters, allowing it to independently initiate COT while the network device can similarly prepare its own COT parameters, thereby preventing collisions through pre-coordinated channel access planning.
3Productivity
If both network and terminal devices initiate COT, then spectrum utilization improves, but coordination complexity increases
Solution Approach 1:
The patent introduces dynamic parameters for COT coordination, including configurable periodicity, offset values, and duration for both network and terminal device COTs. The terminal device dynamically determines its first periodic channel occupancy based on received configuration information from the network device, allowing flexible adjustment of COT timing and duration. This dynamic approach enables both devices to initiate COT simultaneously while adapting their parameters to avoid collisions, thereby improving spectrum utilization without excessive coordination complexity.
Data Source
AI summary
Embodiments of the present application provide a wireless communication method, a terminal device, and a network device, where a COT initiated by the network device and a COT initiated by the terminal device can reasonably coexist on an unlicensed spectrum. The wireless communication method includes: the terminal device determining a first periodic channel occupancy, the first periodic channel occupancy being a channel occupancy for the terminal device to perform initiation, the first periodic channel occupancy including a first channel occupancy; the terminal device initiating the first channel occupancy, or, the terminal device determining whether to initiate the first channel occupancy.