OFDMA Mobile Terminal Power Control for Contention Reduction
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Solution Overview
Problem
In orthogonal frequency division multiplexing access (OFDMA) systems, multiple mobile terminals competing for initial access to a base station often fail when they attempt to access simultaneously, and existing solutions to reduce contention require additional resource allocation for data transmission, which is inefficient.
Innovation Solution
A method and device for controlling signal power levels in mobile terminals, where the terminal receives cell broadcasting information from the base station, determines transmission power based on the received power level and base station transmission power information, and adjusts signal power for contention periods to reduce contention rates without additional resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional resources are allocated to the contention period, then the contention rate is reduced, but the resource consumption increases
Solution Approach 1:
The patent changes the transmission power parameter of mobile terminals during the contention period. By adjusting the power level at which terminals transmit contention signals, the system reduces contention failures without requiring additional time-frequency resources. The base station broadcasts power level information, and terminals adapt their transmission power accordingly, resolving the contradiction between reliability and resource consumption.
2Speed
If multiple mobile terminals transmit simultaneously during initial access, then the access speed is improved, but the access success rate decreases
Solution Approach 1:
The patent introduces dynamic transmission power adjustment during the contention period. Instead of fixed power levels, terminals dynamically adapt their transmission power based on broadcasted power level information and received signal measurements. This dynamic adjustment allows simultaneous access attempts while maintaining sufficient signal quality, resolving the contradiction between access speed and success rate.
3Reliability
If transmission power is increased to improve signal quality, then the access success rate is improved, but the energy consumption increases
Solution Approach 1:
The patent implements adaptive transmission power control where terminals adjust their power levels based on broadcasted power level information and received signal measurements. This parameter adjustment allows terminals to achieve sufficient access success rates without consistently using maximum power, thereby reducing overall energy consumption while maintaining reliability.
Data Source
AI summary
The present invention relates to a device for controlling a power level to control contention between mobile terminals in an uplink contention period in an orthogonal frequency division multiplexing access (OFDMA) system, and a method thereof. In the method, cell broadcasting information broadcasted from the base station is received by the mobile terminal, the transmission power information of the base station is obtained from the cell broadcasting information by the mobile terminal, a received power level of the received cell broadcasting information is obtained by the mobile terminal, transmission power of a signal transmitted to the base station is determined based on the transmission power information and the received power level, and the signal is transmitted to a contention period based on the determined transmission power.