Uplink Radio Resource Control via Transmit Power Margin Estimation
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Solution Overview
Problem
The existing communication systems using CDMA method face challenges in efficiently managing uplink radio resources due to the unpredictable nature of interference noise from mobile stations, leading to inefficient radio resource allocation and unstable communication quality, particularly with the introduction of E-DCH technology.
Innovation Solution
A communication method that estimates a transmit power margin and evaluates E-TFC states using this margin to select the appropriate E-TFC for data transmission, ensuring efficient radio resource control and stable communication by managing the transmit power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If E-DCH technology is introduced to improve uplink packet data transmission efficiency, then productivity increases, but device complexity increases due to additional channels and control mechanisms
Solution Approach 1:
The patent segments the uplink transmission into different channels: E-DCH for packet data and DCH for voice/circuit-switched traffic. This segmentation allows independent optimization of each channel type, improving packet data efficiency without compromising voice quality, while the base station manages complexity through separate scheduling mechanisms for each channel.
Solution Approach 2:
The patent implements dynamic channel allocation where the base station schedules E-DCH and DCH resources based on real-time traffic conditions. The mobile station dynamically selects between E-DCH and DCH depending on the type of data being transmitted, allowing the system to adapt to changing network conditions and optimize productivity while managing complexity through flexibility.
2Reliability
If transmit power margin is estimated and E-TFC states are evaluated to optimize radio resource allocation, then reliability improves, but measurement precision requirements increase
Solution Approach 1:
The patent calculates transmit power margin in advance before actual data transmission occurs. The base station estimates the available power margin based on current channel conditions and maximum transmit power settings, then uses this pre-calculated value to determine suitable E-TFC states. This preliminary action ensures reliable resource allocation without requiring high precision measurements during the actual transmission process.
Solution Approach 2:
The patent implements a feedback mechanism where the mobile station reports its maximum transmit power setting to the base station, and the base station uses this information to calculate the transmit power margin. The base station then schedules E-DCH resources based on this feedback information, creating a closed-loop system that improves reliability through continuous monitoring and adjustment without requiring complex real-time measurements.
Data Source
AI summary
Conventionally, there is a problem that a state transition of E-TFC changes according to QoS for descriptions of data to be transmitted, and therefore a mobile station's operation is not decided uniquely. To solve this problem, a transmission control method includes a step of selecting transmission control information according to a combination of user data transmitted, via a transport channel, from an upper layer, and a step of transmitting the transmission control information, as well as a physical channel into which two or more transport channels are multiplexed, to a fixed station, the transmission control information including at least transmit power information.