Wireless Relay Selection for EHF Link Stability
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Solution Overview
Problem
Existing wireless communication systems using extremely high frequency (EHF) bands, such as IEEE 802.11ad, face challenges with short communication range and interference from obstacles, as they rely on directivity and are unable to dynamically form alternative communication routes when links are disrupted.
Innovation Solution
A wireless communication system that includes a first apparatus detecting disconnections and requesting beam-forming training from available apparatuses to determine a reliable relay for re-establishing communication links, using directional antennas and TDMA protocols to manage time slots and beam-forming training sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If EHF wireless communication (60 GHz band) is used for high-speed communication, then communication speed and bandwidth are improved, but communication range becomes short and obstacle sensitivity increases
Solution Approach 1:
The patent introduces relay devices as intermediaries to forward communication signals between terminals. When a direct communication path is blocked or too distant, the source terminal communicates through one or more relay devices that receive and retransmit signals, effectively extending the communication range while maintaining high-speed EHF transmission
Solution Approach 2:
The patent implements dynamic relay selection where the source terminal evaluates multiple candidate relay devices based on real-time conditions including beam-forming gain, channel quality, transmission power requirements, and directional capabilities. The system dynamically selects the optimal relay device to maintain reliable communication as environmental conditions change
2Reliability
If relay devices are introduced to extend communication range, then communication range is improved, but system complexity increases
Solution Approach 1:
The patent enables relay devices to autonomously evaluate themselves and other candidates using their own beam-forming capabilities and channel measurements. Each relay device independently assesses its suitability for relaying based on local conditions, reducing the need for complex centralized control and simplifying the overall system architecture
Solution Approach 2:
The patent performs beam-forming training and channel evaluation in advance to pre-establish communication paths and identify suitable relay devices before actual data transmission begins. This preliminary setup reduces complexity during active communication by having relay selection decisions already made based on pre-measured conditions
Data Source
AI summary
A wireless communication system includes a first wireless communication apparatus and multiple second wireless communication apparatuses. The first wireless communication apparatus includes circuitry that detects that a wireless communication between the first wireless communication apparatus and at least one of the second wireless communication apparatuses is disconnected, requests, if the circuitry detects that the wireless communication with at least one of the second wireless communication apparatuses is disconnected, one of the second wireless communication apparatuses whose wireless communication is not disconnected to perform beam-forming training sequence directed to the second wireless communication apparatus whose wireless communication is disconnected, and determines, based on a result of the beam-forming training sequence acquired from the second wireless communication apparatus whose wireless communication is not disconnected, the second wireless communication apparatus whose wireless communication is not disconnected as a relay apparatus for the second wireless communication apparatus whose wireless communication is disconnected.