Unlicensed Band Channel Access Coordination
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Solution Overview
Problem
In 5G mobile communications, unlicensed frequency bands are shared among multiple wireless devices, leading to interference and reduced network transmission performance due to independent time domain position determination for clear channel assessment (CCA), causing simultaneous data transmission by different devices and interference.
Innovation Solution
Allocating dedicated time units to wireless devices to ensure transmission reliability, where these units do not overlap or partially overlap based on interference levels, with weak interference allowing partial overlap and strong interference preventing overlap, to manage channel access and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless devices independently determine time domain positions for CCA, then each device can autonomously access the channel, but simultaneous data transmission occurs causing interference and reduced network performance
Solution Approach 1:
The patent introduces a network device as an intermediary that coordinates CCA time domain positions among multiple wireless devices. The network device allocates different time domain positions to different devices, preventing simultaneous transmissions. This mediator resolves the conflict between autonomous access and interference avoidance by centralizing the coordination function.
2Object-affected harmful factors
If dedicated time units are allocated to prevent overlap, then interference is reduced, but time resource utilization decreases due to non-overlapping allocations
Solution Approach 1:
The patent implements dynamic allocation of CCA time domain positions based on interference levels. When interference is weak, time units can overlap to improve resource utilization. When interference is strong, time units are separated to reduce interference. This dynamic adjustment allows the system to optimize between interference reduction and resource utilization based on real-time conditions.
Solution Approach 2:
The patent changes the time domain position parameters of CCA based on detected interference levels. The network device or wireless devices adjust the timing parameters dynamically - separating time positions when interference is high and allowing overlap when interference is low. This parameter adjustment resolves the contradiction by adapting to environmental conditions.
3Productivity
If wireless devices share the same frequency domain resource, then spectrum efficiency is improved, but channel contention increases leading to access conflicts
Solution Approach 1:
The patent segments the time domain resources by allocating different CCA time positions to different wireless devices sharing the same frequency band. This temporal segmentation allows multiple devices to access the shared frequency resource without simultaneous contention, improving both spectrum efficiency and access reliability. Each device has a dedicated time window for channel assessment.
Data Source
AI summary
A communication method for using an unlicensed frequency band is provided. The method includes: A first wireless device receives first indication information in a first time unit, where the first indication information is used to indicate a second wireless device to transmit data in a second time unit, or the first indication information is used to indicate a second wireless device not to transmit data in a second time unit, where the second time unit is a preset time unit used by the second wireless device to transmit data.