Uplink Interference Control via Terminal-Reported Gain Ratios
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively controlling uplink interference, as existing methods fail to precisely identify and manage the interference caused by wireless terminals, leading to reduced system capacity and inefficient resource allocation.
Innovation Solution
Wireless terminals measure and report interference information to base stations using beacon and pilot signals, generating gain ratios and uplink loading factor reports to help base stations determine and manage interference levels across different sectors, allowing for more precise interference control and improved resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If distributed interference control strategies are used in CDMA systems, then the overall level of interference is lowered, but the precision of controlling worst interference sources is reduced
Solution Approach 1:
The patent implements feedback mechanisms where wireless terminals measure downlink reference signals from multiple base stations, calculate gain ratios indicating relative channel conditions, and report this information to serving base stations. This feedback loop enables base stations to identify worst interference sources precisely and adjust uplink power allocation accordingly, resolving the contradiction between distributed control and precise interference source identification.
Solution Approach 2:
The patent performs preliminary measurements of downlink reference signal gains before uplink transmission. Wireless terminals measure reference signals and calculate gain ratios in advance, allowing base stations to predict potential interference levels and pre-adjust power allocation strategies, thereby achieving both overall interference reduction and precise control of interference sources.
2Device complexity
If simple power control strategies are used to maintain equal received power, then implementation complexity is reduced, but uplink capacity is limited
Solution Approach 1:
The patent changes the control parameter from simple received power equality to gain ratios of downlink reference signals. By measuring and reporting gain ratios, the system enables differentiated uplink power control where terminals can transmit at different rates and powers, increasing uplink capacity while maintaining manageable complexity through standardized measurement and reporting procedures.
Solution Approach 2:
The patent introduces dynamic power control where uplink transmission parameters are continuously adjusted based on measured gain ratios and reported interference conditions. This dynamic adaptation allows the system to optimize uplink capacity in real-time while keeping implementation complexity reasonable through automated measurements and standardized reporting mechanisms.
3Measurement precision
If loading factor information is communicated between wireless terminals and base stations, then interference determination accuracy is improved, but system overhead increases
Solution Approach 1:
The patent extracts only the essential interference-related information (gain ratios of downlink reference signals and loading factors) from the complete system state and transmits this condensed data between wireless terminals and base stations. This selective information exchange improves interference determination accuracy while minimizing system overhead by transmitting only the most critical parameters needed for interference control decisions.
Data Source
AI summary
A wireless terminal receives and measures broadcast reference signals, e.g., beacon and/or pilot signals, transmitted from a plurality of base station attachment points. The wireless terminal monitors for and attempts to recover broadcast loading factor information corresponding to attachment points. The wireless terminal generates and transmits an interference report to a current attachment point, the report based on the results of a measured received reference signal from the current attachment point, a measured received reference signal from each of one or more different attachment points, and uplink loading factor information. In the absence of a successfully recovered broadcast uplink loading factor corresponding to an attachment point, the wireless terminal uses a default value for that loading factor. Generated interference reports are based on beacon signal measurements and uplink loading factors, pilot signal measurements and uplink loading factors, or a mixture of beacon and pilot signal measurements and uplink loading factors.