Dynamic RAR Window Sizing for LC-MTC Coverage Enhancement
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Solution Overview
Problem
In Machine Type Communication (MTC) devices, the high repetition of physical channels for coverage enhancement in Low Complexity MTC (LC-MTC) UEs leads to inefficient spectrum use and increased power consumption, particularly in establishing radio resource control connections.
Innovation Solution
A base station dynamically determines and transmits the size of the random access response window to user equipment (UE) based on variables such as repetition level, random access response multiplexing, and downlink control information aggregation level, using the Enhanced Physical Downlink Control Channel (EPDCCH) for efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high repetition of physical channels is used for coverage enhancement, then coverage is improved, but spectrum efficiency deteriorates and power consumption increases
Solution Approach 1:
The patent applies dynamics by making the random access response window size adjustable rather than fixed. The base station dynamically determines the window size based on current system conditions including repetition level, random access response multiplexing, and downlink control information aggregation level. This allows the system to adapt the monitoring duration to actual needs, reducing power consumption when smaller windows suffice while maintaining coverage reliability when larger windows are necessary.
2Reliability
If high repetition of physical channels is used for coverage enhancement, then coverage is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the random access response window size based on multiple factors including repetition level, random access response multiplexing, and downlink control information aggregation level. By changing this temporal parameter adaptively, the system optimizes the balance between coverage reliability and spectrum efficiency, allowing shorter windows when spectrum resources should be preserved and extending windows only when coverage requirements demand.
3Device complexity
If fixed window size is used for random access response, then implementation is simplified, but adaptability to varying communication demands deteriorates
Solution Approach 1:
The patent transitions from a static fixed window size to a dynamic adjustable window size. The base station calculates the appropriate window size based on real-time parameters including repetition level, random access response multiplexing, and downlink control information aggregation level. This dynamic approach maintains relatively simple implementation while significantly improving adaptability to varying communication demands and system conditions.
Data Source
AI summary
In one example embodiment, a base station includes a processor configured to determine a window size indicating for how long a random access response transmission by the base station is to be searched and monitored. The base station further includes a transceiver connected to the processor and configured to transmit, over a downlink control channel, downlink control information including the determined window size.