Uplink Transmission Power Control for Wireless Terminals
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Solution Overview
Problem
In wireless communication systems, terminals face challenges in identifying failed random access procedures due to identical temporary identifiers and experience increased interference when transmitting uplink data at high altitudes, affecting adjacent terminals and base stations.
Innovation Solution
A method is implemented where the transmission power of user equipment is configured based on altitude, with the base station providing transmission power information and adjusting power levels to reduce interference, and the random access procedure is reinitiated with a new temporary identifier upon failure indication, allowing for timely retransmission without timer expiration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased for uplink data transmission at high altitude, then data transmission reliability is improved, but interference to adjacent terminals and base stations increases
Solution Approach 1:
The patent applies dynamics by making the transmission power adjustable rather than fixed. The base station dynamically controls the terminal's transmission power through power control commands sent on downlink channels, allowing the system to adapt transmission power levels to current interference conditions and channel quality, thereby resolving the contradiction between maintaining reliable transmission and reducing interference.
Solution Approach 2:
The patent changes the transmission power parameter based on terminal altitude and channel conditions. By adjusting this key parameter, the system can optimize the balance between ensuring sufficient signal quality for reliable data transmission and limiting the power level to reduce harmful interference to other cells and terminals.
2Reliability
If a timer is used to wait for random access procedure completion, then terminal can identify failed access, but access delay increases
Solution Approach 1:
The patent implements feedback by having the base station actively notify the terminal when random access procedure fails, rather than requiring the terminal to wait for timer expiration. The base station sends feedback information indicating access failure, allowing the terminal to immediately know the result and reinitiate access without unnecessary delay, thus resolving the contradiction between reliable identification and time efficiency.
Data Source
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AI summary
The present invention relates to a method and device for allowing a terminal to transmit, to a base station, uplink data in a wireless communication system. According to the present invention, the terminal: performs a random access procedure with a base station; sets transmission power for transmitting first uplink data; and transmits, to the base station, the first uplink data according to the set transmission power, wherein the transmission power can be set according to an altitude of the terminal.