Adaptive UE Timer Configuration for RRC Handover in Coverage Enhanced LTE
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Solution Overview
Problem
The existing Radio Resource Control (RRC) procedures in LTE networks, particularly for Machine Type Communication (MTC), face inefficiencies due to increased time requirements for state changes and handovers, leading to higher failure rates and power consumption, as the current timer settings do not account for repetitive transmissions and receptions used for coverage enhancement.
Innovation Solution
The implementation of a terminal device and base station system that dynamically adjusts UE timers based on repetition levels, allowing for optimized RRC procedures by configuring timers specific to coverage enhancement scenarios, thereby reducing failure rates and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If repetitive transmissions and receptions are performed for coverage enhancement, then coverage range is improved, but procedure time increases
Solution Approach 1:
The patent applies dynamics by making the timer value adaptive rather than fixed. The timer is dynamically adjusted based on the repetition level configured for coverage enhancement, allowing the system to optimize the balance between coverage range and procedure time according to actual channel conditions and repetition requirements
Solution Approach 2:
The patent changes the timer parameter value based on the repetition level. Different timer values are configured for different repetition levels (e.g., longer timers for higher repetition levels), allowing the system to adapt the timing parameters to match the coverage enhancement requirements while preventing premature timer expirations
2Area of stationary object
If repetitive transmissions and receptions are performed for coverage enhancement, then coverage range is improved, but failure rate increases
Solution Approach 1:
The patent modifies the timer parameter based on repetition level to prevent premature expirations that cause failures. By adjusting the timer value to account for the additional time required by repetitive transmissions, the system maintains reliability while achieving coverage enhancement
3Area of stationary object
If repetitive transmissions and receptions are performed for coverage enhancement, then coverage range is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the timer value adaptive to repetition levels. This prevents unnecessary timer expirations and subsequent retransmission procedures, thereby reducing wasted power consumption while maintaining coverage enhancement benefits
Data Source
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AI summary
Provided is technology relating to: a terminal device, a base station device, a communication method, and an integrated circuit capable of efficiently performing a Radio Resource Control procedure. The terminal device is configured to, when receiving, from the base station device, an RRC message including information on a target cell, random access information relating to a coverage level, and a timer relating to a handover and indicating the handover, start the timer relating to the handover and execute a random access to the target cell using the random access information relating to the coverage level of the target cell.