PRACH Resource Segmentation for MTC UE Access
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Solution Overview
Problem
Machine Type Communication (MTC) User Equipment (UE) in LTE/LTE-A systems faces challenges in accessing the network due to reduced performance and coverage issues, particularly in environments like basements and corners of walls, necessitating improvements in Physical Random Access Channel (PRACH) design to ensure reliable access and coverage.
Innovation Solution
A method and system for configuring random access channel resources involve sending configuration information to MTC UE, which includes time and frequency domain allocation details, allowing for optimized resource usage and multiplexing techniques to support different types of nodes with varying coverage requirements, ensuring effective random access signaling and response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If MTC UE uses reduced performance configuration (fewer antennas, lower bandwidth, half-duplex mode), then device cost decreases, but coverage performance and access quality deteriorate
Solution Approach 1:
The PRACH resources are segmented into multiple resource subsets (first subset and second subset) with different configurations. MTC UEs can be assigned to different subsets based on their coverage requirements, allowing low-cost devices to access the network with appropriate resource allocation that compensates for their reduced performance capabilities.
Solution Approach 2:
The patent changes key parameters of the PRACH resources including time domain positions, frequency domain positions, and cyclic shifts for different resource subsets. These parameter changes enable MTC UEs with reduced performance to achieve adequate coverage by utilizing resources optimized for their capabilities rather than requiring full-performance device specifications.
2Reliability
If PRACH resources are allocated to support MTC UE in challenging environments, then access quality improves, but system complexity increases
Solution Approach 1:
The PRACH resources are divided into multiple subsets with different configurations tailored to different MTC UE requirements. This segmentation allows the system to support diverse access needs without requiring a completely new complex system, as each subset can be independently configured and managed.
Solution Approach 2:
The PRACH resource configuration mechanism serves multiple functions: it supports both normal coverage MTC UEs and enhanced coverage MTC UEs, accommodates different bandwidth configurations, and provides flexibility for future extensions. This multi-functionality reduces the need for separate specialized systems for different MTC scenarios.
Data Source
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AI summary
A method and system for configuring random access channel resources are disclosed, which relates to the field of communication and solves the problem of access of the MTC UE in LTE/LET-A systems. The method includes: first nodes sending random access channel resource configuration information to second nodes, wherein the random access channel resource configuration information is indicated by one or a plurality of pieces of random access channel configuration information. The technical scheme provided by the embodiment of the present invention is applicable to LTE/LTE-A networks, thereby implementing the random access channel resource configuration of the MTC UE in the LTE/LTE-A systems.