Directional Beam Discovery for Mobile mmWave V2X Link Alignment
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Solution Overview
Problem
The mobility of vehicles in millimeter wave (mmW) V2X communications systems poses challenges in aligning and maintaining directional communication links due to unpredictable vehicle movements, leading to issues in discovering neighboring entities and maintaining beam alignment.
Innovation Solution
A beam discovery procedure using directional beams with coordinated sweep patterns is employed, where transmitting and receiving entities probe and listen in multiple beam directions to increase the likelihood of discovering each other, optimizing the alignment of communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If directional beams are used for communication in mmW V2X systems, then communication reliability and data rate are improved, but the difficulty of discovering neighboring entities and maintaining beam alignment increases due to vehicle mobility
Solution Approach 1:
The patent implements a beam discovery procedure where entities perform preliminary beam sweeping and alignment before actual communication begins. The transmitting entity transmits discovery signals in multiple beam directions, and the receiving entity listens in corresponding directions, establishing beam alignment beforehand to facilitate reliable subsequent communication.
Solution Approach 2:
The patent employs feedback mechanisms where receiving entities provide feedback information about detected transmitting entities to the network. This feedback enables the network to track entity locations and adjust beam directions accordingly, maintaining reliable communication links despite vehicle mobility.
2Reliability
If beam discovery procedure with multiple beam directions is implemented, then the likelihood of discovering neighboring entities is improved, but the time and resources required for alignment increase
Solution Approach 1:
The patent segments the beam discovery process into multiple phases: first phase involves transmitting entities sweeping through multiple beam directions to transmit discovery signals, and the second phase involves receiving entities listening in corresponding directions. This segmentation allows systematic exploration of the environment while managing the complexity of multi-directional alignment.
Solution Approach 2:
The patent implements periodic beam sweeping where entities systematically rotate through predefined beam directions in a periodic manner. The transmitting entity transmits discovery signals in a sequence of beam directions, and the receiving entity periodically switches listening directions, creating a coordinated periodic search pattern that ensures comprehensive coverage.
Data Source
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AI summary
Techniques are described that support techniques for directional discovery in a millimeter wave communications system. A vehicle-to-everything (V2X) communications system may support beam discovery procedures that use directional beams to discover other entities, establish directional communication links with other entities, or maintaining directional communication links with other entities. The beam discovery procedure may include a sweep pattern where a transmitting entity may probe with directional beams in a plurality of beam directions. During a beam discovery procedure a transmitting entity may transmit discovery signals in a plurality of different directions and a receiving entity may listen for the discovery signals in a plurality of different directions. The sweep patterns of the transmitting entity and the receiving entity may be coordinated to increase a likelihood that the receiving entity will discover the transmitting entity.