Resource Block Allocation for Multi-RAT Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, such as GSM, face challenges in supporting Machine-Type Communication (MTC) requirements for extended coverage, low-end market segments with large numbers of connected devices, and relaxed data rate and latency needs, while existing solutions like 'option 2' require new spectrum and reduce downlink coverage.
Innovation Solution
The method involves allocating resource blocks of the first RAT (like GSM) for use by a second RAT with narrower bandwidth, allowing multiplexing onto existing GSM deployments, and using Uplink State Flags to manage resource allocation, enabling simultaneous operation of multiple RATs in a shared frequency spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a new RAT with narrower bandwidth is introduced to support MTC devices, then UL system capacity is improved, but downlink coverage is reduced
Solution Approach 1:
The patent combines multiple RATs (GSM and the new narrowband RAT) into a single wireless communication system where they coexist and share resources. The network controller manages both RATs simultaneously, allowing MTC devices to utilize the narrowband resources for enhanced UL capacity while legacy devices continue using GSM for coverage, thereby merging the benefits of both systems without sacrificing downlink coverage.
Solution Approach 2:
The patent segments the wireless communication system into different operational modes and resource allocations for different device types. MTC devices are assigned specific narrowband resource blocks for UL transmission, while legacy GSM devices use traditional resources. This segmentation allows simultaneous operation of both RATs with optimized parameters for each device category, resolving the coverage-capacity tradeoff.
2Adaptability or versatility
If resource blocks are allocated for multiple RATs, then device connectivity is improved, but resource allocation complexity increases
Solution Approach 1:
The network controller is designed with multi-functionality to manage both GSM and narrowband RATs simultaneously. It performs universal resource allocation, scheduling, and control functions for both RAT types using a unified control mechanism. The Uplink State Flags mechanism provides a universal signaling approach that works across both RATs, simplifying the management complexity despite supporting multiple device types and access technologies.
3Ease of manufacture
If existing GSM deployments are utilized, then deployment cost is reduced, but system capacity for MTC devices is limited
Solution Approach 1:
The system dynamically allocates resource blocks between GSM and narrowband RATs based on real-time MTC device connectivity requirements and traffic conditions. The network controller continuously monitors system state and adjusts resource allocation, enabling existing GSM deployments to adaptively support MTC devices without requiring complete system redesign, thereby maintaining cost-effectiveness while enhancing capacity.
Data Source
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AI summary
A method, performed by a wireless communication system (100), a method and node therein are provided for managing operation of multiple Radio Access Technologies, "RATs". A first type of wireless devices (120) is enabled to communicate wirelessly in the wireless communication system (100) according to a first RAT, via one or more base stations (110). In the first RAT, resource blocks for uplink and/or downlink communication are allocated according to a predetermined multiple access structure based on frequency division and/or time division. The wireless communication system (100) excludes (701) for allocation to the first type of wireless devices (120) one or more of said resource blocks of the first RAT. The wireless communication system (100) further allocates (702) said excluded one or more resource blocks of the first RAT for use by a second type of wireless devices (121) and for wireless communication according to a second RAT, via said one or more base stations.