Unicast Routing in Directional mmWave Networks
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Solution Overview
Problem
Current routing protocols in mmWave wireless networks are inadequate for directional transmissions, as they rely on multicasting, which is not functional due to the highly directional nature of beamforming, leading to challenges in discovering effective routing paths in decentralized networks like ad-hoc or mesh networks.
Innovation Solution
The implementation of unicast-based routing protocols that utilize beamforming training feedback metrics to identify reliable peer stations, disseminate neighborhood discovery lists, construct routing tables, and rank links to efficiently transmit routing requests in a specific order, enabling effective directional data forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicasting is used for routing in mmWave wireless networks, then information can be disseminated to multiple peer stations simultaneously, but routing path discovery becomes ineffective due to the highly directional nature of beamforming
Solution Approach 1:
The patent inverts the conventional multicasting approach by using unicast transmissions for routing path discovery. Instead of broadcasting routing requests to multiple peers simultaneously, the source station sends unicast routing requests to individual peer stations based on beamforming training feedback, thereby adapting to the directional nature of mmWave communications while maintaining routing discovery functionality
Solution Approach 2:
The patent changes the transmission mode parameter from multicasting to unicast for routing requests. This parameter change aligns the routing protocol with the directional beamforming characteristics of mmWave networks, where unicast transmissions can be precisely directed toward specific peer stations using beamforming training feedback metrics
2Reliability
If unicast-based routing protocols are implemented, then routing requests can be effectively transmitted in directional mode, but the complexity of identifying and ranking reliable peer stations increases
Solution Approach 1:
The patent performs preliminary beamforming training between peer stations before routing operations. This preliminary action establishes beamforming training feedback metrics that characterize the quality of directional links, enabling stations to identify and rank reliable peers in advance of actual data transmission, thereby reducing complexity during active routing
Solution Approach 2:
The patent utilizes beamforming training feedback metrics as a basis for ranking peer stations. This feedback mechanism provides quantitative information about link quality between stations, allowing the routing protocol to select reliable peer stations for unicast transmissions based on measured performance characteristics rather than arbitrary selection
Data Source
AI summary
An apparatus and method for communicating via a routing protocol in a wireless network having directional transmission capabilities. Reliable peer stations are identified using Beamforming (BF) training feedback metrics. Routing discovery messages are transmitted by unicast to reliable peer stations, with neighborhood discovery lists disseminated among peer stations in a unicast mode. From the above information, routing tables are constructed with best routing between a source and a destination station, wherein messages can be routed using said routing table from a source peer station, through intermediate peer stations, to a destination peer station. In addition, other embodiments are described, including a simplified two-hop routing apparatus and method.