Cluster-Based Random Access for MTC Spectrum Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The explosive growth of machine-type communication (MTC) poses challenges for network operators due to high energy consumption and inefficient spectrum usage, particularly in licensed spectra, where devices require separate preambles for access, leading to RACH overload and excessive power consumption.
Innovation Solution
A cluster-based random access method utilizing a dual-mode, multi-spectrum device (CHD) that aggregates data from MTC devices on unlicensed spectra and forwards it on licensed spectra, eliminating the need for separate preambles from each device and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate preambles are allocated for each MTC device in the RACH, then device access capability is improved, but RACH resource overload occurs and power consumption increases
Solution Approach 1:
The patent merges multiple MTC devices into a cluster and allocates a single shared preamble for the entire cluster instead of separate preambles for each device. This reduces the quantity of preambles required in the RACH, preventing resource overload while maintaining the ability of multiple devices to access the network simultaneously through the shared preamble resource.
2Adaptability or versatility
If separate preambles are allocated for each MTC device in the RACH, then device access capability is improved, but power consumption of cluster devices increases
Solution Approach 1:
The patent combines the preamble transmission function for multiple devices into a single shared preamble allocation. Devices within a cluster share the same preamble resource, which reduces the total number of high-power preamble transmissions required. This significantly reduces the power consumption for channel access while preserving the ability of all devices in the cluster to access the network.
3Reliability
If licensed spectrum is used for MTC data transfer, then QoS is maintained, but spectrum efficiency decreases due to bursty low-rate traffic
Solution Approach 1:
The patent segments the spectrum resources by introducing an unlicensed complementary channel specifically for MTC bursty low-rate traffic, while the licensed primary channel continues to serve other traffic types. This segmentation allows MTC devices to utilize the unlicensed spectrum for their intermittent data transfers, improving overall spectrum efficiency while maintaining QoS on the licensed channel for other services.
4Productivity
If unlicensed complementary channel is introduced for MTC traffic, then spectrum efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces a gateway as an intermediary component that manages the complexity of dual-channel operations. The gateway handles the coordination between the licensed primary channel and unlicensed complementary channel, managing MTC device connections and data routing. This intermediary approach allows MTC devices to benefit from spectrum efficiency improvements while the gateway absorbs the complexity of managing multiple spectrum access protocols and channel coordination.
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
A method at a network element for providing data access to a network. The method comprising establishing a primary communication channel with the network with a first wireless interface of said network element, establishing a complementary communication channel with one or more of a group of delay tolerant devices with a second wireless interface of said network element, receiving data from respective delay tolerant devices in the group, aggregating the received data and transferring said aggregated data on the established primary communication channel to the network. In an embodiment the primary and complementary channels correspond respectively to first and second spectrums, which may in turn be, respective, licensed and unlicensed spectrums.