Frequency Resource Segmentation for Random Access Response Transmission
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Solution Overview
Problem
In existing wireless communication systems, particularly for Machine Type Communication (MTC) in LTE, there is a challenge in avoiding resource collisions between downlink control channels scrambled using different coverage enhancement levels, leading to inefficient power usage and reduced ability for UEs to receive random access responses.
Innovation Solution
The method involves configuring frequency resources for physical downlink control channels independently based on coverage enhancement levels, allowing for separate transmission of random access responses, thereby reducing blind detections and power consumption by UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink control channels for different coverage enhancement levels are transmitted on the same frequency resources, then resource utilization is improved, but resource collisions occur between different coverage enhancement levels
Solution Approach 1:
The patent segments the frequency resources for downlink control channels by dividing them into multiple groups, where each group is assigned to a specific coverage enhancement level. This segmentation prevents resource collisions between different coverage enhancement levels while maintaining efficient resource utilization within each group.
Solution Approach 2:
The patent applies local quality by assigning different frequency resource characteristics to different coverage enhancement levels. Each coverage enhancement level receives tailored frequency resource allocation optimized for its specific requirements, ensuring reliable transmission without interfering with other levels.
2Reliability
If UEs perform blind detections on all downlink control channels to receive random access responses, then reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent changes the parameter of downlink control channel configuration by introducing coverage enhancement level-based frequency resource division. UEs can identify their specific coverage enhancement level and monitor only the corresponding frequency resources, reducing blind detection attempts while maintaining reliable random access response reception.
3Reliability
If frequency resources are configured independently for different coverage enhancement levels, then resource collision avoidance is improved, but system complexity increases
Solution Approach 1:
The patent segments frequency resources into distinct groups for different coverage enhancement levels, creating a structured and organized configuration approach. This segmentation simplifies the management of independent frequency resources by providing a clear framework for allocation and monitoring.
Data Source
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AI summary
Disclosed in the present application are a random access response (RAR) transmission method and device for ensuring independent transmission of RARs having different coverage enhancement levels, reducing a blind test of a physical downlink control channel performed by a terminal, and saving power consumption of the terminal. The present application provides an RAR transmission method, comprising: determining, by a network side and at least according to coverage enhancement levels corresponding to physical downlink control channels, frequency domain resources of the physical downlink control channels, wherein the frequency domain resources of the physical downlink control channels having different coverage enhancement levels are independently configured; and transmitting, by the network side, the physical downlink control channels on the frequency domain resources of the physical downlink control channels.