Uplink V-MIMO Candidate Selection via Downlink Metrics
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Solution Overview
Problem
Current V-MIMO candidate list generation methods in multi-cell environments fail to maximize spectral efficiency due to increased inter-cell interference, leading to reduced throughput and poor performance for cell-edge users, as they do not adequately consider the additional interference generated by pairing mobile stations.
Innovation Solution
The method involves using downlink metrics such as downlink geometry and power headroom to select mobile stations for the V-MIMO candidate list, ensuring that only those contributing minimal interference are paired, thereby maintaining inter-sector interference levels similar to non-V-MIMO systems and maximizing throughput without degrading cell-edge user performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile stations are paired for V-MIMO in multi-cell environment, then spectral efficiency and throughput are improved, but inter-cell interference increases leading to poor performance for cell-edge users
Solution Approach 1:
The patent applies preliminary action by pre-evaluating and selecting mobile stations with strong downlink signals before pairing them for V-MIMO. The base station determines downlink metrics (signal strength, quality) for each mobile station and creates a candidate list of suitable stations. This preliminary selection ensures that only mobile stations capable of withstanding inter-cell interference are paired, thereby maintaining spectral efficiency gains while protecting cell-edge users from interference degradation.
2Speed
If mobile stations are paired for V-MIMO, then data rate is increased, but additional inter-layer interference is generated affecting robust link sustainability
Solution Approach 1:
The patent implements feedback by continuously monitoring downlink metrics for mobile stations and using this information to dynamically adjust pairing decisions. The base station evaluates downlink signal quality and sustainability metrics, then feeds this information back into the candidate selection process. This feedback mechanism ensures that mobile stations generating excessive inter-layer interference are excluded from pairing, while maintaining high data rates for suitable candidates through informed selection.
3Quantity of substance
If scheduling of multiple mobiles on the same sub-carrier is performed, then capacity is improved, but coverage is negatively affected due to increased interference
Solution Approach 1:
The patent applies local quality by treating different mobile stations differently based on their individual downlink characteristics. Instead of uniform pairing criteria, the system evaluates each mobile station's downlink signal strength and quality locally, then applies pairing decisions based on individual suitability. This allows the system to maximize capacity by pairing multiple mobiles on the same sub-carrier where appropriate, while protecting coverage by excluding mobile stations that would be negatively affected by the resulting interference.
Data Source
AI summary
A method selects mobile station candidates for use with virtual multiple-input multiple-output (“V-MIMO”) in a communication system. The communication system includes at least one base station and a plurality of mobile stations. At least one downlink metric is determined for a first mobile station. The at least one downlink metric is used to determine eligibility for uplink V-MIMO candidate list selection. Responsive to determining that the first mobile station is eligible for uplink V-MIMO candidate list selection, the first mobile station is paired with a second mobile station eligible for uplink V-MIMO candidate list selection.