DMRS Pattern Selection for 5G Control Channel Adaptation
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Solution Overview
Problem
The 5G wireless communication system faces challenges in efficiently delivering downlink control signals to a large number of users, particularly in supporting various services with different requirements such as ultra-reliable and low-latency communication, due to limitations in DMRS configuration and resource allocation.
Innovation Solution
The method involves determining a DMRS pattern based on the service type of a terminal, with the base station identifying the service type and transmitting a downlink control channel and DM-RS accordingly, using either a first DM-RS pattern or a second DM-RS pattern that has more DM-RS resources, to ensure efficient signal transmission and support multiple users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DMRS pattern is used for all users, then the system complexity is reduced, but the ability to support diverse service requirements (eMBB, URLLC, mMTC) deteriorates
Solution Approach 1:
The patent implements dynamic DMRS pattern selection where the base station chooses between first and second DMRS patterns based on the service type of each terminal. This dynamic adaptation allows the system to optimize DMRS configuration for different services (eMBB, URLLC, mMTC) while maintaining manageable complexity through standardized selection criteria.
Solution Approach 2:
The patent changes DMRS configuration parameters (pattern type, resource allocation) according to service type requirements. By varying these parameters dynamically based on terminal service classification, the system achieves versatility across different service types without requiring completely separate configuration systems for each service.
2Quantity of substance
If more DMRS resources are allocated to support multiple users, then the system capacity increases, but the resource overhead and complexity increase
Solution Approach 1:
The patent segments DMRS resources into different patterns (first DMRS pattern, second DMRS pattern) that can be independently allocated to different service types. This segmentation allows the system to support multiple users with diverse requirements by assigning appropriate resource patterns, while keeping management complexity controlled through systematic resource division.
3Measurement precision
If DMRS pattern is determined based on service type, then the accuracy of signal delivery improves, but the signaling overhead increases
Solution Approach 1:
The base station determines and configures the appropriate DMRS pattern based on terminal service type in advance, before actual data transmission. This preliminary configuration ensures accurate signal delivery for each service type while minimizing signaling overhead by establishing the pattern once rather than continuously signaling during transmission.
Data Source
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AI summary
Disclosed are: a communication technique for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety-related services, and the like) on the basis of 5G communication technology and an IoT-related technology. The present invention provides a method by which a base station transmits a DM-RS in a wireless mobile communication system supporting a first transmission time interval (TTI) and a second TTI, comprising the steps of: checking a TTI used in a downlink control channel transmission; determining, as a first pattern, a DM-RS for the downlink control channel if the TTI is the first TTI, and determining, as a second pattern, a DM-RS for the downlink control channel if the TTI is the second TTI; and transmitting, to the terminal, the downlink control channel and the DM-RS according to the determination.