Multi-Link Wireless Device STR NSTR Mode Selection
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Solution Overview
Problem
Wireless networks based on the IEEE 802.11 standard face challenges in providing low and bounded latency due to the random nature of channel access in license-exempt spectrum, making it difficult to support applications requiring deterministic channel access, and the cross-channel self-interference issues in multi-link operations hinder the effective use of multi-link features in the IEEE 802.11be standard.
Innovation Solution
A wireless communication device can select between simultaneous transmit and receive (STR) or non-simultaneous transmit and receive (NSTR) modes and determine adapted communication parameters to operate as a STR MLD, even if it is STR-constrained, allowing for independent channel access and improved latency performance by managing cross-channel self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a MLD performs simultaneous transmit and receive (STR) over multiple links, then throughput is improved, but cross-channel self-interference occurs that degrades reception ability
Solution Approach 1:
The patent measures the actual cross-channel self-interference level and uses this information to adaptively select communication parameters. The harmful interference is converted into useful feedback that enables intelligent parameter selection, allowing the system to operate in STR mode with adapted parameters that maintain acceptable performance despite the presence of self-interference.
Solution Approach 2:
The patent dynamically changes communication parameters (such as modulation and coding scheme, transmit power, resource allocation) based on measured self-interference conditions. By adapting parameters to the actual interference level, the system can maintain STR operation while ensuring reception quality, thus resolving the contradiction between throughput improvement and interference avoidance.
2Reliability
If a MLD operates in NSTR mode to avoid cross-channel self-interference, then reception ability is maintained, but channel access becomes restricted and latency increases
Solution Approach 1:
The patent introduces dynamic adaptation of communication parameters based on real-time self-interference measurements. Instead of statically restricting operation to NSTR mode, the system dynamically adjusts parameters to allow STR operation when interference levels permit, thereby reducing latency while maintaining reception reliability through adaptive parameter selection.
3Loss of time
If WLAN devices operate in contention-free OFDMA scheduled mode to guarantee deterministic channel access, then latency is bounded, but the system requires completely controlled environment without interference
Solution Approach 1:
The patent enables the system to self-adapt to interference conditions by measuring self-interference and autonomously selecting appropriate communication parameters. This self-service capability allows WLAN to provide deterministic latency performance in licence-exempt spectrum without requiring completely controlled environments, as the system automatically adjusts to actual interference conditions.
Data Source
AI summary
Methods and apparatus are provided. In an example aspect, a method in a first wireless communication device of communicating with at least one second wireless communication device on a first channel and a second channel is provided. The method includes selecting a simultaneous transmit and receive (STR) communication mode or non-simultaneous transmit and receive (NSTR) communication mode for communicating with the at least one second wireless communication device on the first channel and the second channel, selecting supported communication parameters for at least one of the first channel and the second channel based on the selected mode, and communicating with the at least one second wireless communication device on the first channel and the second channel using the selected communication mode and according to the selected supported communication parameters.