Uplink Beam Coordination for WLAN Spectral Efficiency
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Solution Overview
Problem
The existing WLAN technologies face low spectral usage efficiency due to unlicensed frequency bands and limited spectrum resources, particularly in uplink coordinated processing where stations cannot synchronously learn and use beamforming matrices, leading to inefficient data transmission.
Innovation Solution
A method where a first access point determines a non-overlapping uplink receiving beam with a second access point, broadcasts an identifier of the current working beam, and negotiates working times and sequences to enable stations to perform data transmission using specific beams, reducing interference and improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple access points use beamforming matrices for uplink coordinated processing, then spectral usage efficiency should improve, but stations cannot synchronously learn and use beamforming matrices, causing transmission failure
Solution Approach 1:
The patent applies preliminary action by having access points pre-determine and broadcast their uplink receiving beam identifiers before stations attempt coordinated transmission. This allows stations to advance-know which beam to use, eliminating the synchronization problem where stations fail to learn beamforming matrices in time. The access point determines the current working uplink receiving beam and broadcasts its identifier, enabling stations to prepare and use the correct beam for transmission.
Solution Approach 2:
The patent segments the uplink receiving area of each access point into multiple reception subareas, with each subarea corresponding to a specific uplink receiving beam. This segmentation allows different stations to be assigned to different spatial sectors, enabling simultaneous transmissions without interference. The access point divides its reception space into distinct beams, and stations are directed to use specific beams based on their location and the access point's current working beam configuration.
2Productivity
If multiple stations transmit simultaneously using beamforming, then channel resource utilization improves, but beamforming matrix interference occurs without proper coordination
Solution Approach 1:
The patent applies local quality by assigning different uplink receiving beams to different spatial locations or reception subareas. Each beam is optimized for a specific local region, and stations are directed to use the beam corresponding to their location. This ensures that simultaneous transmissions from different stations occur in different spatial directions with dedicated beamforming matrices, eliminating interference while maintaining high channel utilization.
Solution Approach 2:
The patent introduces the uplink receiving beam identifier as an intermediary mechanism that mediates between multiple stations attempting simultaneous transmission. The access point broadcasts its current working beam identifier, and stations use this identifier to determine which beam to transmit on. This intermediary coordination mechanism ensures that stations do not interfere with each other while still enabling simultaneous transmissions, resolving the contradiction between high channel utilization and interference avoidance.
Data Source
AI summary
The present invention discloses a data transmission method and apparatus. A first access point determines a current working uplink receiving beam, and broadcasts an identifier of the current working uplink receiving beam of the first access point, so that when a first station associated with the first access point determines, according to the identifier of the current working uplink receiving beam of the first access point, that a first transmitting beam at which the first station is currently working is the current working uplink receiving beam of the first access point, the first station performs data transmission with the first access point by using the first transmitting beam. The current working uplink receiving beam of the first access point and a current working uplink receiving beam of a second access point do not overlap in space.