Channel Feedback Resource Allocation in MU-MIMO Systems
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Solution Overview
Problem
In wireless communication systems, particularly in dense environments, the existing IEEE 802.11ac standard limits the number of simultaneously transmittable stations due to channel information feedback constraints, leading to resource wastage and reduced transmission efficiency as the number of antennas increases, causing service delays and inefficiencies in MU-MIMO and OFDMA techniques.
Innovation Solution
An apparatus and method that adjust resource allocation for channel information feedback in wireless communication systems, allowing multiple users to feed back their channel state information efficiently, synchronizing feedback times to prevent resource wastage and optimize resource use, especially in systems supporting MU-MIMO and OFDMA techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to support more simultaneous STAs in MU-MIMO, then the number of simultaneously transmittable stations increases, but the time required for channel information feedback increases, causing service delays
Solution Approach 1:
The patent segments the channel information feedback process by allocating specific frequency subcarriers to different STAs for feedback transmission. This segmentation allows multiple STAs to feedback channel information simultaneously on different frequency resources, thereby reducing the total feedback time while supporting an increased number of simultaneous stations in MU-MIMO systems
Solution Approach 2:
The patent introduces frequency dimension allocation for channel feedback, moving beyond the traditional time-sequential feedback approach. By assigning different frequency subcarriers to different STAs, the system enables parallel feedback transmission across the frequency domain, effectively reducing feedback time while maintaining support for multiple simultaneous stations
2Productivity
If the number of STAs is increased beyond four in MU-MIMO, then transmission capacity increases, but the existing IEEE 802.11ac feedback mechanism becomes insufficient, requiring more feedback resources
Solution Approach 1:
The patent creates a universal feedback resource allocation mechanism that works for both IEEE 802.11ac and 802.11ax systems. The method provides a multi-functional framework that handles channel feedback for multiple STAs simultaneously using OFDMA resources, making the feedback mechanism scalable and adaptable to different system configurations without requiring separate mechanisms
3Loss of energy
If channel information feedback resources are not properly allocated, then resource wastage occurs, but proper allocation requires sophisticated resource management
Solution Approach 1:
The patent implements preliminary resource allocation where the access point pre-assigns specific frequency subcarriers to each STA before they need to feedback channel information. This advance allocation prevents resource conflicts and wastage by ensuring each STA has a dedicated feedback resource, while the simplicity of the pre-assignment mechanism avoids excessive management complexity
Data Source
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AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). Methods and apparatuses are provided for devices in a wireless communication system. Information requesting a channel estimation by at least one second device is transmitted from a first device to the at least one second device. Channel information is received at the first device as feed back from the at least one second device.