Cell-Free Massive MIMO Resource Management Without Channel Hardening
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Solution Overview
Problem
Existing cell-free massive MIMO networks assume channel hardening, which rarely occurs, leading to inadequate performance evaluation and resource allocation, resulting in unfair performance distribution among users.
Innovation Solution
A power allocation and access point scheduling technique that calculates a lower bound on ergodic transmission rate without channel hardening, using a closed-form expression, to provide fair and uniform performance to all users by optimizing transmission power and access point scheduling based on location and channel estimation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If channel hardening assumption is used for performance evaluation and resource allocation, then the system complexity is reduced and existing technologies can be applied, but the performance evaluation becomes inaccurate and resource allocation becomes unfair because channel hardening rarely occurs in cell-free massive MIMO networks
Solution Approach 1:
The patent changes the fundamental parameter assumption from channel hardening to no channel hardening. It derives new closed-form expressions for ergodic transmission rate that accurately reflect the actual channel conditions in cell-free massive MIMO networks, where channel hardening does not occur. This parameter change enables accurate performance evaluation and fair resource allocation without requiring the unrealistic channel hardening assumption.
2Ease of manufacture
If channel hardening assumption is made for resource allocation, then existing resource allocation techniques can be applied, but fairness among users deteriorates because the assumption does not reflect actual network conditions
Solution Approach 1:
The patent changes the performance evaluation parameter from channel hardening-based metrics to no channel hardening-based ergodic transmission rate. By deriving closed-form expressions that accurately represent actual channel conditions, it enables resource allocation techniques to achieve fair performance distribution among users without requiring complex simulations or unrealistic assumptions.
3Device complexity
If existing performance evaluation methods assuming channel hardening are used, then the evaluation process is simplified, but the resource allocation becomes inadequate and unfair to users
Solution Approach 1:
The patent changes the evaluation parameter from channel hardening assumption to actual no channel hardening conditions. It provides closed-form expressions for ergodic transmission rate that enable simplified yet accurate performance evaluation, leading to effective and fair resource allocation without increasing system complexity.
Data Source
AI summary
There is provided a resource management method to be processed by a resource management apparatus in a cell-free massive MIMO network system. The method comprises receiving communication information from an access point; allocating transmission power information based on the communication information; setting scheduling information of the access point based on the transmission power information; receiving device data of a user terminal from the access point based on the scheduling information; and decoding the received device data.