LTE RLM Parameter Adjustment for MTC Long Range Extension
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Solution Overview
Problem
Current cellular communications networks face challenges in supporting low-cost, low-power Machine-Type Communication (MTC) devices with enhanced coverage and spectrum efficiency, particularly for MTC services that require long range extension and relaxed latency, while maintaining compatibility with existing LTE networks.
Innovation Solution
The solution involves adjusting Radio Link Monitoring (RLM), Radio Link Failure (RLF) detection, and RLF recovery parameters in LTE networks to reduce signaling overhead and energy consumption for MTC devices operating in long range extension mode, by modifying parameters such as Qin, Qout, T301, T310, T311, N310, N311, T304, and T300, allowing for extended coverage without compromising normal mode performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If MTC devices operate in long range extension mode to achieve enhanced coverage, then coverage area is improved, but signaling overhead and energy consumption increase
Solution Approach 1:
The patent modifies RLM parameter values (Qin, Qout thresholds, monitoring periodicity) specifically for long range extension mode to reduce the frequency and intensity of radio link monitoring operations, thereby lowering energy consumption while maintaining adequate coverage extension
2Area of stationary object
If MTC devices operate in long range extension mode to achieve enhanced coverage, then coverage area is improved, but signaling overhead increases
Solution Approach 1:
The patent introduces mode-specific parameter configurations that adjust RLM monitoring behavior for long range extension mode, reducing unnecessary signaling exchanges between the MTC device and network while maintaining coverage enhancement
3Device complexity
If standard RLM parameters are used for MTC devices in long range extension mode, then device complexity is kept low, but radio link monitoring performance deteriorates
Solution Approach 1:
The patent implements local quality by applying different RLM parameter sets specifically tailored for long range extension mode operations, optimizing monitoring performance for the specific propagation conditions without increasing overall device complexity
4Reliability
If RLM monitoring frequency is increased to improve radio link monitoring performance, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent enables dynamic adjustment of RLM monitoring frequency based on operational mode, using higher monitoring frequency only when necessary for long range extension mode while maintaining lower frequency for normal operations, thus optimizing the reliability-energy tradeoff
Data Source
AI summary
Systems and methods are disclosed for adjusting Radio Link Monitoring (RLM), Radio Link Failure (RLF) detection, RLF recovery, and/or connection establishment failure detection for wireless devices (16) in a cellular communications network (10) depending on mode of operation. In one embodiment, a node (14, 16) in the cellular communications network (10) determines whether a wireless device (16) (e.g., a Machine Type Communication (MTC) device) is to operate in a long range extension mode of operation or a normal mode of operation. The node (14, 16) then applies different values for at least one parameter depending on whether the wireless device (16) is to operate in the long range extension mode or the normal mode. The at least one parameter includes one or more RLM parameters, one or more RLF detection parameters, and/or one or more RLF recovery parameters. In doing so, signaling overhead and energy consumption within the wireless device (16) when operating in the long range extension mode is substantially reduced.