Radio Base Station Narrowband Resource Allocation
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Solution Overview
Problem
Conventional communication systems face challenges in reducing communication overhead in low-cost Machine-Type Communication (MTC) terminals due to the use of control signals that assume the same bandwidth for both the system and shared channels, leading to inefficient cellular system coverage.
Innovation Solution
A radio base station with a resource allocation section that allocates a physical downlink shared channel to a predetermined narrow band within the downlink system bandwidth, and a downlink control information generating section that determines the size of resource allocation information based on this narrow band, reducing unnecessary communication overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional control signals assuming system bandwidth equals shared channel bandwidth are used, then compatibility with existing systems is maintained, but communication overhead increases unnecessarily
Solution Approach 1:
The patent changes the parameter of bandwidth assumption in control signals from system bandwidth to narrowband PDSCH bandwidth. By determining the resource allocation field size based on the narrowband PDSCH bandwidth rather than the full system bandwidth, the patent reduces the number of bits required for resource allocation information, thereby reducing communication overhead while maintaining compatibility through standardized signaling procedures
Solution Approach 2:
The patent introduces dynamic adaptation of control signal parameters based on the allocated narrowband width. The downlink control information generating section dynamically adjusts the resource allocation field size according to the specific narrowband PDSCH allocation, allowing the system to optimize overhead for each transmission while maintaining flexibility for different bandwidth configurations
2Ease of manufacture
If narrowband PDSCH allocation is implemented for low-cost MTC terminals, then terminal cost and system coverage are improved, but control signal overhead increases due to mismatched bandwidth assumptions
Solution Approach 1:
The patent applies parameter changes by adjusting the resource allocation field width in downlink control information to match the narrowband PDSCH allocation. Instead of using the full system bandwidth parameter, the system now uses the narrowband PDSCH bandwidth parameter to determine the number of resource blocks and corresponding signaling bits, thereby reducing overhead for low-cost MTC terminals while maintaining their cost-effective narrowband operation
Solution Approach 2:
The patent segments the downlink bandwidth into narrowband allocations for MTC terminals while maintaining the full system bandwidth structure. By creating separate narrowband resource pools and determining control signal parameters based on these segmented allocations rather than the entire system bandwidth, the patent enables cost-effective MTC terminal operation with reduced control overhead
Data Source
AI summary
The present invention is designed so that communication overhead pertaining to control signals is reduced in a communication system in which the bandwidth of a physical downlink shared channel is narrower than the system bandwidth. The radio base station of the present invention has a resource allocation section that allocates a physical downlink shared channel to a predetermined narrow band in a downlink system bandwidth, for a user terminal, and a downlink control information generating section that generates downlink control information to report to the user terminal, and the downlink control information generating section determines the size of a field pertaining to resource allocation information, included in downlink control information related to the physical downlink shared channel, based on the narrow band where the physical downlink shared channel is allocated.