Wireless Handover Thresholds for Power Mismatch Management
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Solution Overview
Problem
Higher power class User Equipment (HPUEs) deployed in areas with Access Node (AN) density designed for lower power class UEs (LPUEs) cause uplink interference and inefficient power use due to power mismatches, leading to degraded UL system performance and premature reach of maximum transmit power.
Innovation Solution
Configuring handover thresholds and adjusting maximum allowable transmit power based on reported power levels to classify UEs and apply power offsets, allowing ANs to manage power mismatches and extend handoff trigger points, thereby optimizing UL link budgets and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HPUEs transmit at higher maximum allowable power levels, then HPUE throughput is enhanced, but UL system performance degrades due to interference with LPUEs
Solution Approach 1:
The patent applies local quality by configuring different handover thresholds specifically for HPUEs versus LPUEs. HPUEs are assigned higher handover thresholds that reflect their power capabilities, while LPUEs use standard thresholds. This localized differentiation allows HPUEs to maintain higher transmit powers without causing interference to LPUEs, as the network can identify and separately manage each device's power characteristics.
Solution Approach 2:
The patent changes the handover threshold parameter based on UE power class. By adjusting this critical parameter differently for HPUEs and LPUEs, the system enables HPUEs to operate at higher power levels while preventing premature handovers that would cause interference. The handover threshold serves as a control parameter that adapts to the specific power capabilities of each UE type.
2Reliability
If artificial power limits are assigned to HPUEs and LPUEs, then power mismatch is controlled, but UEs reach maximum transmit power before necessary from range extension perspective
Solution Approach 1:
The patent introduces dynamic power management where the maximum allowable transmit power is not fixed but adjusted based on real-time conditions including pathloss, interference levels, and UE classification. HPUEs can dynamically increase their transmit power when needed for range extension, while the network maintains control to prevent harmful interference. This dynamic approach replaces static artificial power limits with adaptive power control.
Solution Approach 2:
The patent performs preliminary classification of UEs into HPUE and LPUE categories based on their power capabilities before interference occurs. By identifying and tagging HPUEs in advance, the network can pre-configure appropriate handover thresholds and power parameters, allowing HPUEs to utilize their full power potential for range extension without causing interference to LPUEs.
3Area of stationary object
If HPUEs are deployed in areas with AN density designed for LPUEs, then HPUE coverage is improved, but UL link budget for LPUEs deteriorates
Solution Approach 1:
The patent segments the UE population into distinct groups (HPUEs and LPUEs) with different handover threshold configurations. This segmentation allows the network to manage HPUEs and LPUEs separately, enabling HPUEs to operate in the same geographic area as LPUEs without compromising the UL link budget of LPUEs. Each segment receives tailored threshold settings appropriate to its power characteristics.
Data Source
AI summary
Systems and methods are described for configuring a handover threshold for wireless devices in a wireless network. A plurality of wireless devices operating in a radio range of an access node (AN) are instructed to report an actual maximum allowable transmit power value at the AN. The plurality of wireless devices are classified based on the reported actual maximum allowable transmit power value. Handover thresholds for the plurality of wireless devices are configured based on the classification.