Mesh Preamble Link Signaling for Spatial Reuse Under CCI
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Solution Overview
Problem
Wireless communications systems with mesh networks experience degraded performance due to co-channel interference (CCI) among devices sharing the same channel, leading to inefficiencies in packet transmission and reception.
Innovation Solution
Implementing a method where mesh devices carry link information in the preamble of data transmission frames, including source-destination relationship and predicted signal strength, allowing other devices to determine spatial reuse (SR) transmission availability, thereby coordinating mesh network operations to mitigate CCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices wait for channel completion to avoid CCI, then interference is prevented, but transmission efficiency deteriorates
Solution Approach 1:
The transmitting device performs preliminary actions by carrying link information (source-destination relationship and predicted signal strength) in the preamble of the data transmission frame. This allows receiving devices to predict potential CCI and take preventive measures before the interference actually occurs, enabling proactive channel management rather than reactive waiting.
Solution Approach 2:
The system implements feedback mechanisms where link information is continuously exchanged between mesh devices through preambles. Devices use this feedback to dynamically adjust their transmission decisions, determining whether to proceed with transmission or defer based on predicted signal strength and source-destination relationships, thereby optimizing both reliability and efficiency.
2Productivity
If devices transmit simultaneously on the same channel, then spatial reuse is improved, but CCI increases
Solution Approach 1:
The patent applies local quality by treating different spatial locations and link types differently. Link information indicates specific source-destination relationships and predicted signal strengths for different device pairs. Devices can identify that transmissions in certain local contexts (different BSS colors, sufficient signal strength margins) will not cause harmful CCI, allowing selective spatial reuse in specific locations while preventing interference in others.
Solution Approach 2:
The system changes parameters dynamically by using link information to determine transmission conditions. Instead of fixed channel access rules, devices adjust their transmission decisions based on varying parameters such as predicted signal strength, BSS color, and source-destination relationships. This enables flexible spatial reuse where transmissions are allowed when parameters indicate safe conditions while preventing CCI when parameters indicate potential interference.
3Reliability
If link information is carried in preambles, then coordination is improved, but frame overhead increases
Solution Approach 1:
The patent makes the preamble multi-functional by using it not only for traditional signal detection and synchronization purposes but also for carrying link information such as source-destination relationships and predicted signal strength. This universal use of the existing preamble structure enables improved mesh coordination without adding separate dedicated signaling channels, thereby limiting the increase in frame overhead to only the necessary additional bits within the existing structure.
Data Source
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AI summary
A method for performing mesh 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 mesh device to a second mesh device, wherein the set of link information may include at least one indication among the following indications: a source-destination relationship indication between the first mesh device and the second mesh device and at least one predicted signal strength measured for the first mesh device and the second mesh device (S11); wherein a third mesh 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 SR transmission availability of the third mesh device based on the set of link information.