Coordinated Beamforming Orthogonalization Adjustment
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Solution Overview
Problem
Existing coordinated beamforming methods in LTE systems face challenges such as high computational complexity, performance decline in coordinated UEs, and conflicts when multiple CoMP UEs request coordination simultaneously, with no effective solutions provided in prior art.
Innovation Solution
A method and device for coordinated beamforming that determine a target CoMP UE from multiple CoMP UEs, reject coordination requests from others, compute channel correlation values, and adjust beamforming vectors based on these values to avoid performance reduction and conflicts, ensuring optimal beamforming orthogonalization only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If SLNR algorithm is adopted to maximize signal-to-leakage-and-noise ratio, then interference to other UEs is reduced, but computational complexity becomes very high and transmission delay increases
Solution Approach 1:
The patent changes the optimization parameter from maximizing SLNR (which requires complex iterative computation) to minimizing beamforming vector adjustments. By changing the optimization criterion from a complex ratio maximization to a simpler interference minimization approach, the computational complexity is significantly reduced while still achieving interference reduction to other UEs.
Solution Approach 2:
Instead of fully optimizing beamforming vectors for all CoMP UEs simultaneously (which causes high complexity and conflicts), the patent applies partial action by selectively adjusting only those coordinated UE beamforming vectors that are necessary. This partial optimization approach reduces computational burden and transmission delay while maintaining effective interference coordination.
2Object-affected harmful factors
If beamforming orthogonalization adjustment is applied to coordinated UE, then interference to CoMP UE is reduced, but performance of coordinated UE may decline
Solution Approach 1:
The patent applies local quality by making beamforming adjustments UE-specific rather than uniformly for all coordinated UEs. Each coordinated UE's beamforming vector is adjusted only when and where necessary to reduce interference to CoMP UEs, while preserving the quality of service for the coordinated UE itself. This localized approach ensures that interference reduction does not come at the cost of coordinated UE performance.
Solution Approach 2:
The patent implements feedback mechanisms where the network monitors the performance of coordinated UEs and adjusts beamforming vectors accordingly. By using feedback on channel state information and performance metrics, the system can determine when beamforming adjustment is beneficial and when it would harm coordinated UE performance, thus resolving the contradiction between interference reduction and performance maintenance.
3Adaptability or versatility
If multiple CoMP UEs request coordination simultaneously from the same coordinated cell, then service coverage is expanded, but conflicts occur with no effective solutions
Solution Approach 1:
The patent applies preliminary action by establishing a priority mechanism that determines which CoMP UE gets served first before conflicts arise. When multiple CoMP UEs request coordination simultaneously, the system pre-determines the serving order based on channel conditions, QoS requirements, or other criteria, thus preventing conflicts before they occur and maintaining reliable coordination service.
Solution Approach 2:
The patent segments the coordination requests by dividing them into different priority levels or time slots. Instead of handling all CoMP UEs uniformly, the system segments the service based on channel correlation values and coordination needs, allowing multiple UEs to be served sequentially or in parallel at different priority levels, thus expanding service coverage while avoiding conflicts.
Data Source
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AI summary
A coordinated beamforming method and device. The method includes: upon receipt of coordination request from multiple coordinated multi-point user equipments (CoMP UE), determining a target CoMP UE from multiple CoMP UEs; calculating a channel correlation value between the target CoMP UE and each candidate coordinated UE in a coordinated cell; determining, on basis of channel correlation value between the target CoMP UE and each candidate coordinated UE, a target coordinated UE; if the channel correlation value between target coordinated UE and the target CoMP UE is lower than a preset lower channel correlation threshold, then not performing beamforming orthogonalization adjustment on the target coordinated UE; and if the channel correlation value between target coordinated UE and target CoMP UE is greater than or equal to the preset lower channel correlation threshold, then performing beamforming orthogonalization adjustment on target coordinated UE. The present application can greatly reduce the probability of a performance decline of the target coordinated UE.