Communication Device Coordinated Transmission Control
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Solution Overview
Problem
In coordinated transmission schemes for wireless local area networks, delays in backhaul communication can lead to overhead and degradation of system capacity due to the need for access points to wait for control information exchange, and existing solutions like timeouts result in inefficiencies and increased standby times.
Innovation Solution
A communication device that uses a separate transmission channel for control information exchange between access points, allowing for the transmission of request and response signals to determine the acquisition status of control information, enabling flexible switching between transmission schemes like Joint Tx and Coordinated Tx without unnecessary standby times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access points wait for control information exchange via backhaul before data transmission, then coordinated transmission can be performed, but standby time increases and system capacity degrades
Solution Approach 1:
The patent applies preliminary action by having access points exchange control information in advance before data transmission is needed. The coordinated control information including transmission timing, weights, and terminal identification is exchanged via backhaul connection prior to the actual coordinated transmission, so that when data transmission is scheduled, all access points are already prepared and no standby time is required.
Solution Approach 2:
The patent implements feedback mechanisms where access points notify each other of their control information acquisition status through request and response signals. This feedback allows the transmitting access point to determine whether to proceed with coordinated transmission or switch to non-coordinated transmission based on real-time status information from partner access points.
2Reliability
If timeout mechanism is used to discard control information, then delayed information is eliminated, but transmission efficiency does not improve due to increased overhead
Solution Approach 1:
The patent applies dynamics by making the transmission scheme flexible and adaptive. Instead of using a fixed timeout mechanism that always discards information, the system dynamically determines whether to perform coordinated transmission or non-coordinated transmission based on the acquisition status of control information. The transmitting access point can switch between transmission modes in real-time based on feedback from partner access points.
Solution Approach 2:
The patent changes the parameter of transmission mode from a static timeout-based approach to a dynamic parameter that can be adjusted based on control information availability. The system monitors the acquisition status of coordinated control information and adjusts the transmission approach accordingly - using coordinated transmission when information is available and non-coordinated transmission when it is not, thereby optimizing transmission efficiency.
3Reliability
If separate transmission channel is used for control information exchange, then control information reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by separating control information transmission from data transmission into distinct channels. The control information is exchanged via a dedicated backhaul connection between access points, while data transmission occurs over the wireless access channel to terminals. This segmentation ensures that control information receives reliable delivery through the wired backhaul while data transmission maintains high speed over wireless, and the channels operate independently without interfering with each other.
Data Source
AI summary
The present technology relates to a communication device capable of performing coordinated transmission more flexibly. Provided is a communication device including a control unit that performs control to exchange control information used when performing coordinated transmission in which a plurality of communication devices performs data transmission in a coordinated manner with a first other communication device that coordinates by using a first transmission channel different from a second transmission channel used for wireless communication with a second other communication device serving as a transmission destination of data, and transmit a request signal that requests notification of an acquisition status of the control information to the first other communication device. The present technology can be applied to, for example, communication devices that form a wireless LAN system.