Joint Transmission Gain Normalization for Wireless APs
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Solution Overview
Problem
In wireless communication systems, joint transmissions by multiple access points (APs) face challenges due to disparate gain adjustments, which can lead to decreased throughput and interference, as different APs apply different gain values during joint transmissions.
Innovation Solution
A method is introduced to determine a normalized gain adjustment value based on sounding power levels and backoff power values, which is uniformly applied to all APs to ensure consistent transmission power levels, preventing relative gain scale errors and maintaining phase synchronization across APs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different APs apply different gain values during joint transmissions, then each AP can optimize its individual transmission, but relative gain scale errors occur and throughput decreases
Solution Approach 1:
The patent applies homogeneity by requiring all APs participating in joint transmission to use the same gain adjustment value. The master AP determines a normalized gain adjustment value based on sounding power levels and backoff power values, then communicates this same value to all slave APs. This ensures uniform gain adjustment across all APs, preventing relative gain scale errors and maintaining consistent signal levels at the receiver, thereby improving throughput.
2Adaptability or versatility
If different APs apply different gain values, then individual transmission optimization is possible, but interference increases
Solution Approach 1:
The patent applies homogeneity by requiring all APs participating in joint transmission to use the same gain adjustment value. The master AP determines a normalized gain adjustment value based on sounding power levels and backoff power values, then communicates this same value to all slave APs. This ensures uniform gain adjustment across all APs, preventing relative gain scale errors and maintaining consistent signal levels at the receiver, thereby improving throughput.
3Productivity
If a normalized gain adjustment value is uniformly applied to all APs, then consistent transmission power levels are achieved and throughput improves, but the system requires coordination overhead
Solution Approach 1:
The patent applies segmentation by dividing the gain adjustment determination function: the master AP performs the calculation of the normalized gain adjustment value based on sounding power levels and backoff power values, while slave APs simply apply the received value. This segmentation reduces overall system complexity as slave APs don't need independent calculation capabilities, while still achieving uniform gain adjustment across all APs for improved throughput.
4Reliability
If a normalized gain adjustment value is uniformly applied to all APs, then phase synchronization is maintained and reliability improves, but calculation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the gain adjustment determination function: the master AP performs the calculation of the normalized gain adjustment value based on sounding power levels and backoff power values, while slave APs simply apply the received value. This segmentation reduces overall system complexity as slave APs don't need independent calculation capabilities, while still achieving uniform gain adjustment across all APs for improved throughput.
Data Source
AI summary
This disclosure provides methods, devices and systems for wireless communication, and particularly, methods, devices and systems for implementing a joint transmission feature in a wireless communication system. Using the joint transmission feature, multiple access points (APs) may use an aggregated collection of antennas of multiple APs to simultaneously transmit a joint beamformed transmission to one or more stations (STAs). The techniques in this disclosure may prevent or reduce variations in relative gain adjustments by the APs that could otherwise negatively impact the joint transmission. In some implementations, a network device may determine a normalized gain adjustment value based on power parameters associated with each of the multiple APs. In some other implementations, each AP may determine the normalized gain adjustment value based on power parameters shared between the APs.