Channel State Feedback Scheduling for Limited-Capability WLAN Stations
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Solution Overview
Problem
In multi-user multiple-input multiple-output (MU-MIMO) technology, especially in WLAN, some stations cannot immediately feed back channel state information due to limited capability or insufficient resources, leading to resource waste and reduced transmission efficiency.
Innovation Solution
An access point sends a feedback indication message, high-efficiency long training sequence, and resource scheduling message to stations, allowing them to acknowledge receipt and schedule channel state information transmission efficiently, using orthogonal communication resources to avoid waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AP waits for channel state information feedback from STAs with limited capability, then the feedback can be received, but resources are wasted and transmission efficiency is reduced
Solution Approach 1:
The AP performs preliminary resource allocation and sends feedback indication messages to STAs before the actual channel state information feedback is needed. This allows STAs with limited capability to prepare and transmit feedback at predetermined times without causing delays or resource waste, as the transmission resources are already reserved and configured in advance.
Solution Approach 2:
The system dynamically adjusts feedback mechanisms based on STA capability. The AP can differentiate between STAs with full capability and those with limited capability, applying different feedback strategies. For limited-capability STAs, the system uses predetermined resource allocation and timing, while more capable STAs can provide immediate feedback, optimizing overall system efficiency.
2Productivity
If multiple STAs are scheduled for channel state information feedback simultaneously, then resource utilization improves, but STAs with limited capability cannot immediately perform feedback
Solution Approach 1:
The feedback process is segmented into different stages and resource allocations. STAs are divided into groups based on capability, with different resource allocation strategies applied to each group. Limited-capability STAs are assigned specific time slots and resources in advance, while other STAs can provide immediate feedback, allowing the system to handle multiple STAs simultaneously without forcing immediate feedback from all.
Solution Approach 2:
Different quality requirements and resource allocations are applied to different STAs based on their local capabilities. The system tailors the feedback mechanism to each STA's ability, providing predetermined resources for limited-capability STAs while allowing immediate feedback from capable STAs, thus optimizing overall resource utilization without compromising any single STA's operational ease.
3Loss of energy
If the AP allocates insufficient resources for feedback, then resource waste is reduced, but STAs cannot perform feedback immediately
Solution Approach 1:
The AP performs preliminary resource allocation by sending feedback indication messages that include predetermined resource assignments to STAs before feedback is needed. This ensures that limited-capability STAs have the necessary resources ready in advance, eliminating both resource waste (by allocating only what is needed) and feedback delays (by having resources prepared beforehand).
Data Source
AI summary
Embodiments of the present invention provide a method and an apparatus for transmitting channel state information. The method includes: sending a feedback indication message, a high-efficiency long training sequence, and a resource scheduling message, wherein the feedback indication message is used to indicate more than one target STAs that need to feed back channel state information, the high-efficiency long training sequence is used for determining the channel state information by the target STAs, and the first resource scheduling message is used to indicate a communication resource used by the target STAs when the target STAs feed back the channel state information; and receiving the channel state information sent by the target STAs by using the communication resource.