MAC Entity Reconfiguration for Uplink Channel Status Report Triggering
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Solution Overview
Problem
Current UMTS systems face challenges in minimizing delay and efficiently triggering status reports during uplink channel reconfigurations, leading to potential degradation in Quality of Service (QoS) due to delayed status report generation and unnecessary retransmissions.
Innovation Solution
A method and apparatus for reconfiguring the MAC entity in a MAC layer of a mobile terminal, where protocol data units are provided to an RLC layer and flushed from a reordering buffer upon uplink channel reconfiguration, allowing for immediate status report generation and transmission to the mobile terminal, even when prohibited by timers, and enabling the mobile terminal to trigger status reports upon reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If status reports are triggered immediately upon uplink channel reconfiguration, then delay is minimized and QoS is enhanced, but timer-prohibited transmissions may cause instability in the communication system
Solution Approach 1:
The system performs preliminary actions by flushing the reordering buffer and providing stored protocol data units to the RLC layer before the actual status report transmission. This preparation ensures that the system is ready for immediate status report triggering without causing instability, as the reordering buffer is cleared in advance of the reconfiguration event.
Solution Approach 2:
The invention implements feedback mechanisms where the MAC entity provides feedback about the reconfiguration event to the RLC layer, triggering status report generation. This feedback loop allows the system to respond appropriately to reconfiguration while maintaining stability through controlled information flow between layers.
2Productivity
If protocol data units are flushed from the reordering buffer immediately upon reconfiguration, then data recovery is accelerated, but potential data loss may occur during the transition
Solution Approach 1:
The system performs preliminary action by providing all stored protocol data units from the reordering buffer to the RLC layer before flushing the buffer. This ensures that no data is lost during the transition, as all data is transferred in advance while maintaining productivity through immediate buffer clearance.
Solution Approach 2:
The RLC layer acts as an intermediary between the MAC layer and the data transmission system. By transferring protocol data units through the RLC layer before flushing the buffer, the system ensures data integrity while enabling rapid recovery, as the intermediary handles the transition safely.
3Reliability
If status reports are transmitted without timer prohibition, then QoS is enhanced through immediate reporting, but unnecessary retransmissions may occur
Solution Approach 1:
The system performs preliminary action by flushing the reordering buffer and providing data to the RLC layer before triggering status report transmission. This preparation allows immediate reporting without causing unnecessary retransmissions, as the buffer is cleared in advance and the system state is optimized for the transition.
Data Source
AI summary
The invention relates to method and apparatus for reconfiguring a MAC entity of a MAC layer of the apparatus receiving protocol data units from a mobile terminal via on uplink upon reconfiguration of the uplink channel. Further, the invention relates to methods and mobile terminals for triggering the transmission of a status report from an RLC entity configured for an uplink channel of a network element in a radio access network, as well as a method and terminal for configuring the MAC layer of the mobile terminal. In order to enable an efficient and fast generation of RLC status reports after an uplink channel reconfiguration the invention suggests new mechanisms to trigger the transmission of status reports upon uplink reconfiguration as well a new operation and configuration of radio access network elements and UEs upon uplink channel reconfiguration, in particular a transmission time interval (TTI) reconfiguration.