Wireless Base Station Reference Signals for Joint-Transmission Interference
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Solution Overview
Problem
Conventional wireless communication systems face challenges in accurately estimating interference caused by joint transmission among multiple access points, leading to increased interference with other basic service sets and reduced system throughput.
Innovation Solution
A wireless base station generates a reference signal for interference estimation during joint transmission, determines settings based on the estimation, and communicates these settings to other wireless stations, allowing for informed interference management and joint transmission scheme selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint transmission is performed by multiple access points to improve system throughput, then transmission gain is increased, but interference with terminals in other basic service sets is increased
Solution Approach 1:
The patent performs preliminary interference estimation by transmitting reference signals from multiple access points before actual joint transmission. This allows the system to predict potential interference levels to other BSS terminals and select appropriate transmission schemes (coherent or non-coherent joint transmission) in advance, preventing excessive interference while maintaining throughput benefits
Solution Approach 2:
The patent implements a feedback mechanism where interference estimation results are communicated back to the transmitting access points. Based on this feedback, the system dynamically adjusts transmission parameters such as beamforming weights, power allocation, and scheme selection to balance throughput improvement with interference control to other BSSs
2Device complexity
If conventional beamforming training protocol is used for interference estimation, then estimation process is simplified, but accuracy of interference estimation is insufficient
Solution Approach 1:
The patent modifies the reference signal parameters specifically for interference estimation purposes, using dedicated pilot signals with known characteristics transmitted by multiple access points. This allows accurate measurement of combined signal effects and interference patterns without requiring complex general-purpose training protocols, achieving both accuracy and reasonable complexity
Data Source
AI summary
Interference with another terminal caused by joint transmission of a plurality of wireless base stations is appropriately estimated. A wireless base station includes a wireless control section and a communication section. The wireless control section, when performing joint transmission with a joint wireless base station, generates a reference signal for estimating interference given to a wireless terminal connected to another wireless base station, and determines a setting regarding joint transmission in accordance with a result of estimation of interference based on the reference signal. The communication section transmits a reference signal to another wireless base station or a wireless terminal, and announces, to a joint wireless base station, a setting regarding joint transmission.