Excluding Relay Nodes from MU-MIMO Pairing
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Solution Overview
Problem
In heterogeneous wireless networks, the prioritization of users for MU-MIMO pairing based on channel orthogonality and SINR can reduce efficiencies and decrease overall cell throughput, especially when relay nodes are included, leading to reduced channel capacity and QoS degradation at cell-edges and hotspots.
Innovation Solution
The system excludes relay-capable wireless devices from MU-MIMO pairing and prioritizes non-relay capable devices based on channel orthogonality and SINR meeting a set threshold, allowing for optimized resource allocation and improved cell throughput by using SU-MIMO mode for relay-capable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay nodes are included in MU-MIMO pairing based on channel orthogonality and SINR, then more users can be served, but cell throughput and network efficiency decrease
Solution Approach 1:
The patent segments users into two distinct groups: relay nodes and non-relay users. Relay nodes are excluded from MU-MIMO pairing while non-relay users are selected for pairing based on channel orthogonality and SINR thresholds. This segmentation resolves the contradiction by preventing relay nodes from degrading cell throughput while still allowing them to serve users in coverage holes through alternative mechanisms.
Solution Approach 2:
The patent extracts relay nodes from the MU-MIMO pairing process entirely. By removing relay-capable users from the set of candidates for MU-MIMO pairing, the system eliminates the harmful interference and efficiency losses that relay nodes cause in this mode, while still enabling relay functionality through separate SU-MIMO operations.
2Area of stationary object
If relay nodes participate in MU-MIMO pairing, then spatial coverage is extended, but channel capacity and QoS at cell-edges deteriorate
Solution Approach 1:
The system segments the user population into relay nodes and non-relay users, applying different pairing strategies to each group. Non-relay users are paired for MU-MIMO to maximize channel capacity and QoS, while relay nodes operate in SU-MIMO mode to extend spatial coverage. This segmentation allows both objectives to be achieved simultaneously without compromising either.
Solution Approach 2:
The patent applies different operational modes to different user types: MU-MIMO mode for non-relay users to optimize local channel capacity and QoS, and SU-MIMO mode for relay nodes to optimize spatial coverage. This local differentiation of quality (operational mode) allows the system to optimize for different objectives in different locations and user scenarios.
Data Source
AI summary
Systems and methods are described for selecting relay nodes for Single-User Multiple-Input-Multiple Output (SU-MIMO). A channel orthogonality and Signal-to-Interference-Plus-Noise Ratio (SINR) of a plurality of wireless devices located in a geographic area of an access node is determined. A relay-capable status of the plurality of wireless devices is determined. Non-relay capable wireless devices located in the geographic area are excluded from SU-MIMO. From the plurality of wireless devices, relay-capable wireless devices are selected for SU-MIMO. The selected relay-capable wireless devices are prioritized for SU-MIMO based on a channel orthogonality and SINR meeting a set threshold.