Wireless Mesh Network Spatial Reuse via Link Information Preamble
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Solution Overview
Problem
Wireless communications systems with mesh networks experience performance degradation due to co-channel interference (CCI) when multiple links use the same channel, leading to re-transmissions and inefficiencies.
Innovation Solution
The method involves carrying link information in the preamble of data transmission frames, including destination device, device assignment, and transmission power control indications, allowing network devices to determine spatial reuse availability and adjust transmission power to mitigate CCI through SR scheduling and power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple links in mesh network use the same channel to improve network capacity and spatial reuse, then productivity is improved, but co-channel interference causes reliability to deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where receiving devices send interference feedback information to transmitting devices. The feedback includes interference level measurements and recommendations for transmission parameter adjustments. This closed-loop control allows the system to dynamically adjust transmission parameters based on actual interference conditions, resolving the contradiction between utilizing same-channel transmissions for capacity while maintaining reliability through active interference management.
Solution Approach 2:
The patent dynamically changes transmission parameters including power levels, modulation schemes, and coding rates based on channel conditions and interference levels. By adjusting these parameters in response to spatial reuse opportunities and interference conditions, the system can transmit on the same channel with different parameter sets, thereby increasing network capacity while maintaining transmission reliability through adaptive optimization.
2Reliability
If devices wait for packet transmission completion before transmitting on the same channel to prevent CCI, then reliability is improved, but productivity deteriorates due to degraded overall performance
Solution Approach 1:
The patent transforms the static channel access approach into a dynamic one where devices can simultaneously transmit on the same channel with different spatial-temporal characteristics. By introducing dynamic spatial reuse opportunities, power control adjustments, and interference-based scheduling, the system allows overlapping transmissions that adapt to real-time conditions, thereby improving overall performance while maintaining reliability through active interference management rather than rigid sequential access.
Solution Approach 2:
The patent segments the wireless medium into multiple spatial streams and temporal opportunities, allowing different devices to transmit on the same frequency channel simultaneously but in different spatial directions or time slots. This segmentation enables parallel transmissions that would otherwise interfere, thereby increasing productivity while maintaining reliability through spatial and temporal separation of interfering signals.
3Productivity
If spatial reuse transmission is allowed to improve network efficiency, then productivity is improved, but co-channel interference causes harmful factors to increase
Solution Approach 1:
The patent converts co-channel interference from a harmful factor into useful information for system optimization. By measuring and reporting interference levels as feedback, the system identifies spatial reuse opportunities and adjusts transmission parameters to exploit conditions where interference is manageable or beneficial. This transforms the previously harmful interference into a signal that guides efficient resource allocation and spatial reuse decisions, thereby improving network efficiency while controlling harmful effects.
Solution Approach 2:
The patent dynamically changes transmission parameters such as power levels, modulation orders, and coding rates in response to interference conditions. By adjusting these parameters based on real-time measurements of co-channel interference, the system can maintain high network efficiency through spatial reuse while keeping harmful interference effects below threshold levels through adaptive parameter optimization.
Data Source
AI summary
A method for performing network control in a wireless communications system and associated apparatus are provided. The method may include: carrying a set of link information in a preamble of a first data transmission frame transmitted from the first network device to a second network device, wherein the set of link information may include at least one indication among the following indications: a destination device indication, a device assignment indication and a transmission power control indication; wherein a third network device is arranged to monitor wireless transmission in the wireless communications system to obtain the set of link information from the first data transmission frame, and determine spatial reuse (SR) transmission availability of the third network device based on the set of link information.