Uplink Coupling Factor for Interference Management
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Solution Overview
Problem
Current uplink power control in communication networks is suboptimal due to the lack of accurate determination of the impact of increased transmit power in one cell on uplink interference in neighboring cells.
Innovation Solution
An uplink coupling factor is introduced to quantify the extent of uplink traffic interference between a serving cell and neighboring cells, using downlink measurement reports, serving cell resource information, and neighbor cell resource information, assuming downlink-uplink reciprocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmit power is increased for communication devices on one cell, then network performance and reliability are improved, but uplink interference in neighbor cells increases, negatively impacting their performance
Solution Approach 1:
The patent implements a feedback mechanism where the network node receives uplink interference measurements from neighbor cells and uses this information to dynamically adjust uplink power control parameters. The network node calculates a power adjustment amount based on the measured interference level and applies this adjustment to limit interference to neighbor cells while maintaining network reliability.
Solution Approach 2:
The patent changes the power control parameters dynamically based on interference conditions. The network node adjusts the uplink power control parameter (such as P0 or alpha) based on measured interference levels, transforming the static power control into a dynamic adaptation process that responds to real-time interference conditions in neighbor cells.
2Device complexity
If uplink power control is implemented without accurate interference determination, then power control complexity is reduced, but system performance optimization is limited
Solution Approach 1:
The patent introduces an intermediary measurement and calculation mechanism where the network node acts as a mediator between uplink transmit power and neighbor cell interference. The network node receives interference measurements, calculates appropriate power adjustments, and applies these adjustments, thereby bridging the gap between simple power control and complex interference management without requiring direct complex interactions between all network elements.
Data Source
AI summary
A network node (30) obtains downlink measurement reports (32) that are reported by communication devices (12-1 . . . 12-X) to a serving cell (14S) and that each reports a downlink measurement on the serving cell (14S) and a downlink measurement on a neighbor cell (14N). The network node (30) also obtains serving cell resource information (34) indicating, for each of the communication devices (12-1 . . . 12-X), a number of transmission resources utilized by the communication device for uplink traffic (18) on the serving cell (14S). The network node (30) further obtains neighbor cell resource information (36) indicating a number of transmission resources available for uplink traffic (13) on the neighbor cell (14N) and a number of transmission resources utilized for uplink traffic (13) on the neighbor cell (14N). The network node (30) calculates, from the downlink measurement reports (32), the serving cell resource information (34), and the neighbor cell resource information (36), an uplink coupling factor (37) that indicates an extent to which uplink traffic (18) on the serving cell (14S) interferes with uplink traffic (13) on the neighbor cell (14N).