Data Block Transmission Control via RTT Measurement
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Solution Overview
Problem
Conventional methods for controlling data block transmission in wireless communication systems fail to accurately set timer values due to the lack of measurement for round trip time (RTT), leading to inefficient data block retransmissions and degraded quality of service (QoS).
Innovation Solution
A method and apparatus that measure the RTT by transmitting a round trip time measurement request and response, using sequence numbers to ensure accurate timing, and update timer values periodically to optimize data block retransmissions and prevent unnecessary resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If timer values are set without measuring round trip time (RTT), then the system operation is simple, but data block transmission efficiency deteriorates
Solution Approach 1:
The patent performs RTT measurement in advance by transmitting measurement requests and receiving responses before actual data block transmission. The measured RTT values are stored and used to configure optimal timer values (transmission interval timer and prohibit timer) for subsequent data transmission, ensuring efficient retransmission timing without real-time measurement overhead.
Solution Approach 2:
The patent implements a feedback mechanism where RTT measurement responses from the receiving end provide timing information back to the transmitting end. This feedback is used to dynamically adjust timer values based on actual network conditions, creating a closed-loop control system that optimizes transmission efficiency while adapting to changing network environments.
2Reliability
If timer values are not updated periodically based on RTT measurement, then the system operation is simple, but quality of service (QoS) deteriorates
Solution Approach 1:
The patent implements periodic RTT measurement and timer update operations. The transmitting end periodically sends RTT measurement requests and updates its timer values based on the measured RTT. This periodic adjustment ensures that timer values remain optimized for current network conditions, maintaining high QoS for data block retransmissions while using a manageable periodic update rhythm.
3Loss of time
If RTT measurement is implemented, then data block retransmission timing is optimized, but system resource consumption increases
Solution Approach 1:
The patent implements RTT measurement using existing status PDUs (Protocol Data Units) that are already being transmitted for acknowledgment purposes. Instead of sending separate dedicated measurement packets, the RTT measurement information is piggybacked on regular status reports, achieving accurate timing measurement while minimizing additional resource consumption. The measurement is performed selectively based on available status PDU opportunities.
Data Source
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AI summary
A method and apparatus for controlling a transmission of data blocks is provided by which data block transmission can be controlled more efficiently by measuring the RTT and setting a control timer value according to the measured RTT