Uplink Transmission Rate Control via NACK Verification
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Solution Overview
Problem
In conventional mobile communication systems using Enhanced Uplink, unintended decreases in uplink user data transmission rates occur due to false detection of 'Down' commands in the Relative Grant Channel (RGCH), leading to inefficient radio resource utilization and increased operational costs.
Innovation Solution
The transmission rate of uplink user data is controlled by transmitting a 'Down' command only when the data is successfully received, ensuring that the mobile station decreases the transmission rate only upon receipt of a positive acknowledgment signal from the radio base station, thereby preventing unintended rate decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile station decreases the transmission rate upon receiving a 'Down' command in RGCH, then the transmission rate control responsiveness is improved, but false detection of 'Down' commands causes unintended rate decreases and radio quality degradation
Solution Approach 1:
The patent implements a feedback mechanism where the mobile station verifies whether the 'Down' command in RGCH corresponds to actual NACK reception. The transmission rate is decreased only when both the 'Down' command is received AND NACK is detected, creating a feedback loop that prevents false rate decreases while maintaining responsive control
Solution Approach 2:
The patent introduces NACK signal detection as an intermediary condition between receiving the 'Down' command and executing the rate decrease. This intermediary verification step acts as a mediator that filters out false 'Down' commands while preserving legitimate rate control instructions
2Productivity
If fast control for changing transmission rate is implemented, then the data transmission efficiency for burst traffic is improved, but processing load and operational costs increase
Solution Approach 1:
The patent enables the mobile station to perform self-verification of 'Down' commands by checking for corresponding NACK signals locally, without requiring additional network processing or intervention. This self-service approach maintains fast control responsiveness while minimizing the processing burden on the network side
3Ease of operation
If the mobile station decreases transmission rate upon false detection of 'Down' command, then the transmission rate control mechanism operates, but radio resource utilization becomes inefficient
Solution Approach 1:
The patent uses NACK signal detection as feedback to verify whether a 'Down' command should trigger a rate decrease. By requiring this feedback confirmation, the system avoids unnecessary rate reductions that would waste radio resources while maintaining simple operational control
Data Source
AI summary
In the conventional mobile communication system using an “Enhanced Uplink, the present invention improves a radio quality by preventing a decrease in a transmission rate of uplink user data, the decrease unintended by the radio base station Node B and caused by a false detection of a “Down” command in an RGCH.” A transmission rate control method according to the present invention includes: transmitting, from a radio base station to a mobile station, a relative transmission rate control channel for instructing to decrease the transmission rate of the uplink user data, only when the uplink user data transmitted from the mobile station has been successfully received.