Channel Aware Rank Adaptation in MIMO Wireless Systems
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Solution Overview
Problem
Existing MIMO techniques in wireless communications systems are deficient in dynamically adapting ranks for frequency resources, leading to reduced channel reliability and throughput due to unequal channel conditions across allocated frequency resources.
Innovation Solution
Implementing channel-aware dynamic rank adaptation methods, where wireless devices, such as base stations and user equipment, use reference signals and common algorithms to dynamically assign different ranks to individual frequency resources based on channel conditions, leveraging channel reciprocity and machine learning for optimal rank assignment without additional signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rank is used for all allocated frequency resources, then device complexity is reduced, but channel reliability and throughput deteriorate due to unequal channel conditions across frequency resources
Solution Approach 1:
The patent segments the frequency resources into different groups or subsets, each assigned a different rank value. Instead of applying a single uniform rank across all allocated subcarriers, the system divides the frequency domain into multiple segments and assigns appropriate ranks to each segment based on channel conditions, thereby improving reliability without excessively increasing complexity.
Solution Approach 2:
The patent applies local quality by assigning different rank values to different frequency resource segments based on their specific channel conditions. Each frequency segment receives a tailored rank assignment that matches its local channel characteristics, rather than applying a uniform global rank, thus optimizing performance for each local region while maintaining manageable overall complexity.
2Productivity
If dynamic rank adaptation is implemented across frequency resources, then throughput and channel reliability improve, but signaling overhead increases due to additional rank indication signaling
Solution Approach 1:
The patent makes the rank adaptation mechanism universal by enabling both the transmitting and receiving devices to independently perform rank assignment using a common algorithm. This multi-functional approach allows the system to achieve dynamic rank adaptation without requiring extensive additional signaling, as both devices can autonomously determine the rank assignments based on shared channel knowledge.
Solution Approach 2:
The patent implements self-service by enabling the receiving device to autonomously determine the rank assignments for different frequency resources based on channel measurements and the common algorithm, without requiring explicit rank indication signaling from the transmitter. This self-determination capability reduces signaling overhead while maintaining the benefits of dynamic rank adaptation.
3Reliability
If channel-aware dynamic rank adaptation is performed, then communication performance and reliability improve, but device complexity increases due to computation of channel metrics and rank assignment algorithms
Solution Approach 1:
The patent applies partial action by implementing rank adaptation only for the most significant frequency resource segments or under specific channel condition thresholds, rather than performing exhaustive rank optimization across all frequency resources and all possible rank values. This selective approach maintains improved reliability while limiting the computational complexity to essential calculations only.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station and a user equipment (UE) may perform dynamic rank assignment in multiple-input multiple-output (MIMO) communications by leveraging channel reciprocity. For example, the base station and the UE may apply a common algorithm to enable dynamic rank assignment of allocated frequency resources within a communication slot. In some examples, at least one threshold may be utilized to assign different ranks to different frequency resources. Additionally or alternatively, a number of frequency resources assigned a lower rank may be indicated between the base station and the UE in accordance with a joint criteria. Further, dynamic rank assignment may allow the base station and the UE to account for channel fading, improving throughput over the channel without increasing signaling overhead.