Directional WLAN Discovery Assistance Propagation Protocol
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Solution Overview
Problem
Current directional wireless local area network (WLAN) technologies face inefficiencies in neighborhood discovery due to high free-space path loss, channel impairments, and the need for constant discovery signal transmissions in millimeter wave (mmW) communications, leading to increased latencies and wasted power.
Innovation Solution
A protocol that enhances discovery assistance by configuring stations to propagate and respond to discovery assistance requests, reducing the need for constant beacon transmissions and allowing new stations to efficiently find neighboring stations through scheduled beamforming and sector sweeping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If STAs constantly send discovery signals (beacons or beamforming frames) to search for neighboring STAs, then the new STA can discover all active STAs in the local vicinity, but this makes inefficient use of spectrum and increases latencies with transmissions being constantly interrupted
Solution Approach 1:
Existing STAs proactively propagate discovery assistance requests to their neighboring STAs before the new STA actually needs to discover them. This preliminary action ensures that when the new STA sends a discovery request, the information is already prepared and can be responded to immediately, reducing discovery latency and eliminating the need for constant beacon transmissions.
Solution Approach 2:
Existing STAs act as intermediaries by receiving discovery assistance requests from the new STA and propagating them to their neighboring STAs. These intermediaries collect responses from multiple neighbors and aggregate them, then forward the aggregated information back to the new STA. This intermediary mechanism enables reliable neighbor discovery without requiring the new STA to constantly transmit discovery signals.
2Reliability
If STAs constantly send discovery signals to ensure reliable neighbor discovery, then all active STAs can be found, but this wastes energy and spectrum resources
Solution Approach 1:
Existing STAs perform the discovery assistance propagation in advance during their normal operation, rather than waiting for the new STA to send discovery requests. This preliminary action distributes the energy consumption over time and eliminates the need for continuous high-power discovery signal transmissions, thereby reducing overall energy waste while maintaining reliable neighbor discovery.
Solution Approach 2:
Existing STAs serve as energy-efficient intermediaries that handle discovery assistance propagation on behalf of the new STA. By aggregating responses from multiple neighbors and forwarding consolidated information, they reduce the total number of transmissions required compared to the new STA individually querying each potential neighbor, thus reducing energy consumption while maintaining discovery reliability.
3Power
If directional antennas are used in mmW communications to overcome path loss, then high-gain electronically steerable directional antennas can provide sufficient array gain, but this creates channel access issues due to collisions and deafness
Solution Approach 1:
The discovery assistance response mechanism provides feedback about the transmission status and reception quality of directional signals. When a STA receives a discovery assistance request, it can determine whether the request was successfully transmitted and received by aggregating responses from multiple neighbors. This feedback loop enables STAs to adjust their directional beamforming and channel access behavior to avoid collisions and deafness issues while maintaining high array gain.
Solution Approach 2:
STAs perform preliminary beamforming and sector sweeping before actual data transmission. By pre-establishing the optimal beam directions and checking for interference during the discovery assistance phase, the system can resolve channel access conflicts before they occur during data transmission, making directional channel access easier while maintaining high array gain.
Data Source
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AI summary
A wireless communication apparatus / system / method utilizing directional data transmission over a communication (e.g., mmW) band and propagating discovery assistance request and responses to neighboring stations (e.g., in its BSS or in the surrounding area) toward increasing network efficiency. If these stations support discovery assistance they send a discovery assistance response to the station from which the request was propagated. The STA that sent the propagated discovery assistance request processes all the responses and sends a discovery assistance response, containing information about the discovery assistance campaign, to the STA that requested the discovery assistance request.