Carrier Selection for MTC Devices in LTE Networks
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Solution Overview
Problem
Third and fourth generation mobile communication systems require complex and expensive radio transceivers due to advanced data modulation techniques and wide bandwidth usage, which is not economically viable for simple devices like MTC-type terminals that only need to communicate small amounts of data infrequently.
Innovation Solution
Implementing a dedicated messaging network (DMN) with reduced bandwidth and optimized for MTC-type devices, using modified carriers that differ from standard LTE carriers to support lower-capability devices, ensuring they can identify and camp on their intended carrier without overwhelming higher bandwidth carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If standard LTE carriers with wide bandwidth and advanced modulation techniques are used, then network coverage and data rate capabilities are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the LTE carrier into two distinct parts: a legacy carrier component that maintains backward compatibility with simplified devices, and an enhanced carrier component that provides advanced data rates for capable devices. This segmentation allows the network to support both device classes simultaneously without requiring all devices to implement complex transceivers.
Solution Approach 2:
The patent applies local quality by providing different service qualities to different device classes on the same carrier. Simplified MTC devices receive service on the legacy carrier portion with basic modulation and coding, while advanced devices can utilize the enhanced carrier portion with advanced modulation techniques and wider bandwidth, thus each device receives the quality appropriate to its capabilities.
2Device complexity
If simplified devices with reduced functionality are deployed, then device cost and complexity are reduced, but network efficiency and resource utilization deteriorate
Solution Approach 1:
The patent creates a universal carrier structure that serves multiple functions and device classes simultaneously. The same LTE carrier can serve both simplified MTC devices and advanced smartphones, with the network dynamically allocating resources based on device capabilities. This multi-functionality ensures network efficiency is maintained while supporting diverse device complexities.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting modulation schemes, coding rates, and resource allocation parameters based on the detected device class. When a simplified device is detected, the network adjusts parameters to match its capabilities; when an advanced device is detected, parameters are optimized for higher throughput, thus maintaining network efficiency across different device types.
3Measurement precision
If separate carriers are created for different device classes, then carrier selection accuracy is improved, but network complexity and spectrum utilization worsen
Solution Approach 1:
Instead of creating separate physical carriers for different device classes (which would increase spectrum usage), the patent inverts the approach by using a single shared carrier with logical segmentation. The carrier is configured with specific parameters and signaling mechanisms that enable devices to self-identify and select the appropriate service mode, thus achieving accurate carrier selection without multiplying physical carriers.
Data Source
Figure 1
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Figure 4A~4B
AI summary
A mobile communications system is described. The system comprises an arrangement of at least one base station configured to communicate data to and/or from different types of terminal device via respective ones of a plurality of logically separate carriers of a wireless access interface; a first terminal device operable to camp-on to a first carrier of the plurality of carriers and to subsequently communicate data with the arrangement of at least one base station via the first carrier, and a second terminal device operable to camp-on to a second carrier of the plurality of carriers and to subsequently communicate data with the arrangement of at least one base station via the second carrier, wherein the first and second carriers support compatible synchronisation signalling such that the first and second terminal devices both have the ability to synchronise with the first and second carriers to begin a camp-on procedure, and wherein following synchronisation with one of the first or second carriers to begin a camp-on procedure, the second terminal device is configured to determine whether or not to continue with the camp-on procedure in dependence on an aspect of physical layer signalling associated with a control channel of the carrier with which it has synchronised.