RLC Status Report Timer for Radio Resource Reduction

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Solution Overview

Problem

In the Evolved Universal Mobile Telecommunications System (E-UMTS), data loss occurs, particularly as terminals move away from base stations, leading to increased data loss rates, and the current RLC status report mechanism wastes radio resources by transmitting status reports immediately upon detection of missing data.

Innovation Solution

A method is introduced where a timer is started when a PDU is received out of sequence, and a status report is transmitted only when the timer expires, including information about missing PDUs, thereby reducing radio resource consumption by collecting and requesting retransmission of multiple missing data packets at once.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If status report is transmitted immediately upon detection of missing data, then data retransmission reliability is improved, but radio resource consumption increases

Engineering Contradiction:

Improvedata retransmission reliabilityVSAvoidradio resource consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The receiver starts a timer when out-of-sequence PDUs are detected, preparing to wait for potential retransmission before sending status reports. This preliminary timing action allows the system to collect multiple missing PDUs and send them in a single status report, reducing the frequency of radio transmissions while maintaining reliable data recovery.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If status report is transmitted immediately upon detection of missing data, then data transmission speed is improved, but radio resource consumption increases

Engineering Contradiction:

Improvedata transmission speedVSAvoidradio resource consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent merges multiple individual status reports into a single consolidated status report that includes information about multiple missing PDUs. By combining multiple missing data indications into one transmission, the system maintains efficient data recovery while significantly reducing the number of radio resource allocations needed.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of energy

If multiple missing PDUs are collected and reported together, then radio resource consumption is reduced, but data retransmission time increases

Engineering Contradiction:

Improveradio resource consumptionVSAvoiddata retransmission time

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The timer is started immediately when the first out-of-sequence PDU is detected, beginning the collection period in advance. This preliminary timing action ensures that multiple missing PDUs can be aggregated and reported together, reducing radio resource consumption while the timer expiration provides a predictable upper bound on retransmission time.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8964652B2Method for enhancing of controlling radio resources, method for transmitting status report, and receiver in mobile communication system

Publication Date: 2015.02.24 LG ELECTRONICS INC

AI summary

A method for improving radio resources, a method for transmitting a status report, and a receiving apparatus (receiver) in a mobile communication system are disclosed. In transmitting a status report by a receiving side RLC, although data that has not been received (missing PDU) is discovered, the receiving side does not immediately request its retransmission but transmits the status report after the lapse of a certain time (namely, a time point at which a timer expires), to thus reduce radio resources consumed for transmission of the status report.