User Equipment MAC Layer Synchronization Check for Fast Communication Termination

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Solution Overview

Problem

Conventional mobile communication systems experience delays in ending communication due to repeated MAC-DATA-REQ transmissions during synchronization checks, leading to extended communication termination times and resource unavailability.

Innovation Solution

Implementing a threshold value check for RLC-UM transmission requests in a hierarchical structure of RRC, RLC, MAC, and PHY layers to control the number of MAC-DATA-REQ transmissions, allowing for early termination of communication upon SIR deterioration detection and moving to the DCH close procedure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If MAC-DATA-REQ transmission is repeated during synchronization check, then transmission reliability is improved, but communication termination time is extended

Engineering Contradiction:
Improvetransmission reliabilityVSAvoidcommunication termination time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent changes the parameter of transmission repetition count based on synchronization status. When out-of-sync is detected, the MAC-DATA-REQ transmission repetition is stopped or reduced, allowing the system to transition to idle state without waiting for the full T312 timer expiration, thus reducing communication termination time while maintaining necessary reliability

Inventive Principle:
Principle #35Parameter changes

2Reliability

If RLC-UM transmission request is repeated, then data transmission completeness is improved, but resource release speed is reduced

Engineering Contradiction:
Improvedata transmission completenessVSAvoidresource release speed
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic control of RLC-UM transmission requests based on synchronization status. When out-of-sync is detected, the transmission requests are dynamically reduced or stopped, allowing resources to be released faster while ensuring that necessary data transmissions are completed during the synchronized state

Inventive Principle:
Principle #15Dynamics

Data Source

PatentEP2066138B1Mobile communication system, user equipment, and method for reducing communication processing completion time used for them
Publication Date: 2020.11.11 NEC CORP
  • EP2066138B1 patent drawingFigure 1
  • EP2066138B1 patent drawingFigure 2
  • EP2066138B1 patent drawingFigure 3

AI summary

The present invention provides a user equipment that can shorten the time required for a communication ending. The user equipment is put into an error monitoring state in the procedure a4 at the MAC, and a synchronization check is performed. If a RLC-UM transmission request [MAC-DATA-REQ] is repeated (procedure a5) after the UTRAN side is cut off the air in the procedure a3 in the setting from the RLC to the MAC in the hierarchy in the user equipment, at the point where SIR deterioration is detected through a SIR check (procedure a7), the user equipment stops the MAC-DATA-REQ transmission prior to a DCH error detection after the synchronization check, and moves on to the DCH close procedure (procedure a10). The user equipment then ends the communication.