Multi-Beam Broadcast Communication with Per-Beam LBT
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Solution Overview
Problem
Existing communication systems face challenges in extending communication distance and enabling coexistence with different radio communication standards, particularly in the 60 GHz band, while effectively broadcasting data to multiple apparatuses.
Innovation Solution
A communication apparatus and method that forms multiple beams, associates broadcast frames with these beams, and transmits them based on Listen Before Talk (LBT) results, incorporating sector sweeping with reference signals to facilitate data broadcasting to diverse radio communication standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beamforming is used to extend communication distance, then communication range is improved, but compatibility with other radio communication standards deteriorates
Solution Approach 1:
The communication apparatus segments the broadcast transmission into multiple beams directed toward different locations. Each beam can be independently controlled and transmitted, allowing the system to serve multiple radio communication standards simultaneously by directing specific beams to compatible devices while maintaining overall broadcast functionality.
Solution Approach 2:
The system dynamically adjusts beam directions and transmission parameters based on LBT results and detected communication conditions. This dynamic adaptation enables the apparatus to switch between different transmission modes and accommodate various radio communication standards without requiring physical reconfiguration, thereby improving compatibility while maintaining extended communication range.
2Area of stationary object
If broadcast frames are transmitted in multiple directions to reach more apparatuses, then broadcast coverage is improved, but transmission interference increases
Solution Approach 1:
The communication apparatus performs Listen Before Talk (LBT) in advance before transmitting broadcast frames in each beam direction. This preliminary action detects whether the channel is busy in each direction and prevents transmission if interference is detected, thereby reducing harmful interference while still attempting to cover multiple areas.
Solution Approach 2:
The system applies different transmission strategies to different beam directions based on local conditions. Each beam direction is treated independently with its own LBT check and transmission decision, allowing the apparatus to optimize coverage in directions with lower interference while avoiding transmission in directions with high interference, thus improving overall broadcast coverage efficiently.
3Reliability
If Listen Before Talk is performed in each beam direction to reduce interference, then transmission reliability is improved, but transmission time increases
Solution Approach 1:
The system performs LBT selectively in each beam direction rather than requiring LBT for all possible directions simultaneously. By identifying and transmitting only in directions where the channel is clear (partial action), the system achieves reliable transmission without the excessive time cost of checking all directions, thus balancing reliability with transmission efficiency.
Data Source
AI summary
This communication device includes a control circuit that forms a plurality of beams, and a communication circuit that transmits each of a plurality of broadcast frames in association with the respective beams. The communication circuit transmits the plurality of broadcast frames on the basis of a result of Listen Before Talk (LBT) carried out in the direction of the respective beams.