Forward-Link Rate Control via Neighbor Load Feedback
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Solution Overview
Problem
Conventional wireless communication systems fail to optimize forward-link data rates in CDMA networks due to the lack of consideration for neighboring base stations' traffic load, leading to suboptimal data transmission rates and potential interference.
Innovation Solution
An access terminal determines a signal-to-noise ratio (SNR) measurement and receives information on the forward-link traffic load of neighboring base stations, using this data to adjust the requested data rate to the serving base station, thereby accounting for expected interference levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the access terminal requests a higher data rate based solely on SNR measurement, then the data transmission rate increases, but the decoding reliability deteriorates due to unaccounted interference from neighboring base stations
Solution Approach 1:
The access terminal uses feedback from multiple sources (SNR measurement and neighboring base station traffic load information) to adjust the requested data rate. The terminal receives traffic load information from the serving base station about neighboring cells and uses this feedback to modify its data rate request, creating a closed-loop control system that adapts to actual interference conditions rather than relying on incomplete SNR data alone
Solution Approach 2:
The system changes the parameter used for data rate determination from a single parameter (SNR) to multiple parameters (SNR + traffic load information). By incorporating traffic load information as an additional parameter, the system can accurately reflect the true interference environment and select appropriate data rates that maintain both speed and reliability
2Device complexity
If the access terminal ignores neighboring base station traffic load information, then the control mechanism remains simple, but the data transmission efficiency decreases due to suboptimal rate selection
Solution Approach 1:
The base station performs multiple functions: it continues to provide standard forward-link service while also collecting and reporting traffic load information about neighboring base stations to the access terminal. This multi-functionality allows the system to gain enhanced rate control capabilities without adding separate dedicated infrastructure for interference measurement
Solution Approach 2:
The access terminal autonomously processes the traffic load information and independently determines its own data rate request. Rather than requiring centralized control, the terminal uses the received traffic load information to self-adjust its rate selection, maintaining simplicity in the control architecture while improving transmission efficiency
Data Source
AI summary
A method and system is disclosed for forward-link data-rate request determination based on neighbor load. An access terminal in a wireless communication system that includes a plurality of base stations will determine an initial requested forward-link data rate by measuring a signal-to-noise ratio (SNR) of the forward link from its serving base station. The access terminal will then use information indicative of forward-link traffic load of its neighboring base stations to modify its initial determination, whereby the access terminal will increase its initial determination if the average forward-link traffic load of its neighboring base stations is below a threshold load. The access terminal will then transit its forward-link data-rate request (initial or increased) to its serving base station.