Fragmented PRB Resource Allocation for MTC Devices
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting data to Machine-Type Communication (MTC) devices, particularly in terms of data transmission efficiency and cost-effectiveness, especially in scenarios requiring narrow frequency bands and low power consumption, such as smart meters and vending machines, where existing resource allocation methods are not optimized for low data rates and infrequent data communication.
Innovation Solution
The method involves partitioning a Physical Resource Block (PRB) into fragmented PRBs based on time or both time and frequency, allowing for distributed resource allocation and the use of distinct Demodulation Reference Signals (DM-RS) for each fragmented PRB, enhancing frequency diversity and reducing power consumption by optimizing resource utilization and reference signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing resource allocation methods are used for MTC devices, then device compatibility and network coverage are maintained, but data transmission efficiency and power consumption are suboptimal for low data rate applications
Solution Approach 1:
The Physical Resource Block (PRB) is divided into multiple fragmented PRBs in the time domain, allowing MTC devices to transmit small data packets using only a portion of the available resources. This segmentation enables more efficient resource utilization and reduces unnecessary power consumption for low data rate applications
Solution Approach 2:
Different DM-RS sequences are assigned to different fragmented PRBs based on their specific time-frequency locations and antenna ports. This local differentiation optimizes the reference signal structure for each fragment, improving demodulation performance while maintaining overall system compatibility
2Reliability
If PRB is partitioned into fragmented PRBs with distinct DM-RS, then frequency diversity and resource utilization are enhanced, but system complexity increases
Solution Approach 1:
The DM-RS sequence parameters (cyclic shift, orthogonal cover code index) are dynamically adjusted based on the fragmented PRB configuration and antenna port assignments. This parameter adaptation enables the system to achieve frequency diversity gains while maintaining a manageable level of complexity through systematic parameter management
Data Source
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AI summary
The present invention relates to a method and apparatus for transmitting data. The method for a terminal to receive downlink data includes the steps of: receiving resource allocation information from a base station; and demodulating the downlink data transmitted through a sub-resource allocation unit allocated on the basis of the resource allocation information, wherein the sub-resource allocation unit is a plurality of resource units included in one resource allocation unit and the downlink data can be demodulated on the basis of a demodulation reference signal (DM_RS).