ACK/NACK Power Control for Reverse Interference
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Solution Overview
Problem
Conventional mobile communication systems face inefficiencies in reverse packet data transmission, including unreliable ACK/NACK signals and inefficient power allocation, leading to wasted resources and throughput degradation due to incurable errors and unmanaged reverse interference.
Innovation Solution
The proposed solution involves an apparatus and method for controlling reply signal transmission in mobile communication systems, which includes error detection, transmission power control, and symbol repetition based on data transmission rates to improve ACK/NACK reliability and efficiently manage reverse system load, using error detection parts, transmission power control, and symbol repetition mechanisms to adjust transmission power and repetition according to data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve ACK/NACK signal reliability, then signal reliability is improved, but reverse interference and power consumption increase
Solution Approach 1:
The patent applies local quality by differentiating transmission power control based on packet transmission rates. Different mobile terminals receive different power control bit values (0, 1, or 2) according to their specific data rates (9.6kbps, 19.2kbps, or higher), allowing each terminal to use appropriate power levels rather than uniform high power, thus improving reliability where needed while limiting interference elsewhere
Solution Approach 2:
The patent changes the parameter of transmission power dynamically based on packet transmission rate. The base station transmits power control bits that correspond to different power levels, and mobile terminals adjust their ACK/NACK transmission power accordingly. This parameter change resolves the contradiction by matching power levels to actual signal requirements rather than using maximum power universally
2Reliability
If transmission power is increased to improve ACK/NACK signal reliability, then signal reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements local quality by assigning different power control levels to mobile terminals based on their packet transmission rates. Terminals with lower data rates (9.6kbps) receive power control bit 0 (lower power), while terminals with higher data rates receive power control bits 1 or 2 (higher power). This ensures each terminal consumes only the power necessary for its specific communication requirements, reducing overall power consumption while maintaining adequate reliability
Solution Approach 2:
The patent dynamically changes the transmission power parameter based on the mobile terminal's packet transmission rate. The base station monitors data rates and transmits appropriate power control bits, causing terminals to adjust their power consumption adaptively. This resolves the contradiction by preventing unnecessary power consumption at low data rates while ensuring sufficient power availability at high data rates
3Ease of operation
If uniform power control is applied to all mobile terminals, then implementation simplicity is maintained, but reverse interference management becomes inefficient
Solution Approach 1:
The patent applies local quality by differentiating power control treatment based on packet transmission rates. Instead of uniform power control, the system provides tailored power control bit values (0, 1, or 2) to mobile terminals according to their specific data rates. This differentiated approach efficiently manages reverse interference by matching power levels to actual signal requirements, resolving the contradiction between simplicity and effectiveness
4Productivity
If power control bits are transmitted through F-RCCH, then rate control is achieved, but additional channel resources are consumed
Solution Approach 1:
The patent applies universality by using the forward rate control channel (F-RCCH) for dual purposes: traditional rate control and power control for ACK/NACK signals. The power control bits are integrated into the existing F-RCCH transmission framework, allowing the same channel to perform multiple functions without requiring separate dedicated channels. This resolves the contradiction by achieving rate control functionality while minimizing additional channel resource consumption through multi-functional use of existing infrastructure
Data Source
AI summary
In an apparatus for controlling reply signal transmission in a reply signal transmitter that generates and transmits a reply signal according to an error check in packet data received through a radio channel in a mobile communication system, an error detection part generates a reply signal corresponding to the error check from the packet data received through the radio channel. A spreading part spreads the reply signal to output the spread reply signal. A transmission power control part carries out a power control operation for the spread reply signal with a power value that differs according to a packet data transmission rate of a packet data channel. A transmission part transmits the reply signal outputted by the transmission power control part through a radio channel.