MU-MIMO Grouping via Bandwidth Part Power Allocation
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Solution Overview
Problem
MU-MIMO technologies face challenges in coverage area optimization, particularly for wireless devices farther away from access nodes, due to reduced signal strength and sub-optimal pairing, which leads to inefficient resource allocation and interference.
Innovation Solution
The method involves forming MU-MIMO groups by pairing wireless devices using different bandwidth parts (BWPs) based on distance and BWP size, where devices with smaller BWPs near the cell edge are paired with those using larger BWPs closer to the access node, ensuring equalized power spectral density and optimal resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmit power for each MU-MIMO layer is kept constant, then device complexity is reduced, but coverage area and signal strength for distant wireless devices deteriorate
Solution Approach 1:
The patent applies local quality by differentiating transmit power allocation based on device location and BWP size. Distant devices using small BWPs receive higher power allocation than nearby devices using large BWPs, creating localized power control strategies that optimize coverage for specific device groups without increasing overall system complexity
Solution Approach 2:
The patent changes the power spectral density parameter dynamically based on device characteristics. By adjusting power spectral density according to BWP size and device distance, the system maintains constant total transmit power while optimizing signal strength for distant devices, resolving the contradiction between constant complexity and extended coverage
2Strength
If transmit power is increased for distant wireless devices, then signal strength improves, but resource expenditure and interference to other devices increases
Solution Approach 1:
The patent implements local quality by allocating power selectively to specific device groups based on their BWP size and location. Only distant devices using small BWPs receive enhanced power spectral density, while nearby devices using large BWPs maintain standard power levels, thus improving signal strength for needy devices without wasting resources on devices that don't need additional power
Solution Approach 2:
The patent applies partial action by providing power enhancement only to the extent necessary for distant devices using small BWPs. Rather than uniformly increasing power for all devices, the system applies power spectral density adjustment only to the specific subset of devices that benefit from it, avoiding excessive resource expenditure
3Productivity
If wireless devices farther from access node are paired in MU-MIMO groups, then resource utilization improves, but pairing success rate decreases due to low signal strength
Solution Approach 1:
The patent changes the power spectral density parameter for distant devices in MU-MIMO groups, enabling them to maintain reliable connections despite their distance from the access node. This parameter adjustment allows distant devices to be successfully paired in MU-MIMO groups, improving resource utilization without sacrificing pairing success rate
Solution Approach 2:
The patent performs preliminary power spectral density adjustment based on device location and BWP size before forming MU-MIMO groups. By pre-identifying distant devices using small BWPs and allocating appropriate power levels, the system ensures these devices can successfully participate in MU-MIMO pairing, improving both resource utilization and pairing reliability
Data Source
AI summary
Performing MU-MIMO based on bandwidth parts includes identifying a plurality of wireless devices attached to an access node, wherein each wireless device utilizes a different BWP, and wherein wireless devices using larger BWPs are located closer to the access node than wireless devices using smaller BWPs, and forming a MU-MIMO group comprising the plurality of wireless devices, while maintaining a uniform power spectral density by virtue of the differently-sized BWPs.