Random Access Preamble Segmentation for Heterogeneous Wireless Devices
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Solution Overview
Problem
The integration of third and fourth generation mobile telecommunication systems with low capability devices, such as MTC devices, poses challenges due to differing capabilities, leading to increased complexity in resource allocation and scheduling, which affects the efficient operation of wireless telecommunications systems.
Innovation Solution
A method is introduced where the mobile communications network allocates different sequences for forming random access messages based on the capability of communications devices, allowing for the differentiation and separate resource allocation between devices of varying capabilities, including the use of a virtual carrier for reduced capability devices, enabling efficient resource partitioning and reduced complexity receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the mobile communications network supports both conventional LTE devices and MTC devices with different capabilities, then the coverage area and number of supported devices increase, but the complexity of resource allocation and scheduling increases
Solution Approach 1:
The patent segments the random access preamble sequences into different groups (first group for conventional LTE devices, second group for MTC devices). This segmentation allows the network to differentiate between device types and allocate resources accordingly, reducing the complexity of managing heterogeneous devices while supporting a larger quantity of devices.
Solution Approach 2:
The patent applies local quality by assigning specific preamble sequence groups to specific device types. MTC devices use preambles from the second group while conventional devices use preambles from the first group. This localized differentiation enables tailored resource allocation strategies for different device capabilities without increasing overall system complexity.
2Ease of manufacture
If MTC devices use simplified receiver units with reduced capabilities, then manufacturing cost and device simplicity increase, but the ability to process communications resources decreases
Solution Approach 1:
The patent segments the system bandwidth into different virtual carriers, with MTC devices operating on a first virtual carrier and conventional devices on a second virtual carrier. This segmentation allows simplified MTC receivers to process only the narrower first virtual carrier bandwidth, reducing manufacturing cost while maintaining adequate adaptability for MTC applications.
Solution Approach 2:
The patent applies local quality by providing MTC devices with dedicated resources within the first virtual carrier that are optimized for their capabilities. The random access responses for MTC devices are transmitted on the first virtual carrier, ensuring that simplified receivers can successfully process communications resources without requiring full system bandwidth capability.
3Adaptability or versatility
If the network transmits random access responses on the full system bandwidth, then resource allocation flexibility increases, but the complexity of reception for low capability devices increases
Solution Approach 1:
The patent segments the random access response transmission by directing responses for MTC devices to the first virtual carrier while allowing conventional devices to receive responses on the full system bandwidth. This segmentation maintains resource allocation flexibility for conventional devices while reducing reception complexity for MTC devices with simplified receivers.
Solution Approach 2:
The patent introduces the first virtual carrier as an intermediary layer that adapts the full system bandwidth resources to suit MTC device capabilities. The virtual carrier acts as a mediator that translates full-bandwidth resource allocation into a format that simplified MTC receivers can process, thereby resolving the contradiction between resource flexibility and reception complexity.
Data Source
AI summary
A method of transmitting/receiving data between a communications device and a mobile communications network including a wireless access interface providing communications resources within a system bandwidth and in time divided units allocated to communications devices of first and second types having different capabilities. The method generates, at the communications device, a random access message, by selecting a sequence from a predetermined set of sequences, which have been allocated to the communications devices of the second type and transmitting the random access message from the communications device to the wireless communications network, and in response to the random access message, receives a random access response at the communications device transmitted according to the capability of the communications device of second type, the random access message being recognized as from a communications device of second type from the selected one of the predetermined sequences allocated to the communications devices of second type.