Adaptive Retransmission With Shared DMRS for 5G Delay Reduction
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Solution Overview
Problem
The challenge in 5G communication systems is to efficiently manage and transmit different types of services such as eMBB, URLLC, and mMTC, while minimizing data transmission delay and optimizing resource allocation and channel estimation, particularly when URLLC data needs to be transmitted alongside eMBB data in the same frequency band.
Innovation Solution
A method and device for adaptive retransmission that allows terminals to use a shared demodulation reference signal (DMRS) on different channels, enabling efficient channel estimation and resource allocation, and supporting retransmission based on a retransmission type indicator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate reference signals are allocated for each channel, then channel estimation accuracy is improved, but reference signal overhead and resource usage increase
Solution Approach 1:
The patent combines reference signals from multiple channels into a single shared reference signal. Specifically, it merges the reference signals of the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH) into one common reference signal that serves both channels, thereby reducing overall reference signal overhead while maintaining channel estimation capability
Solution Approach 2:
The patent creates a universal reference signal that performs multiple functions simultaneously. The shared reference signal is used for channel estimation on both PDCCH and PDSCH channels, making a single reference signal serve multiple purposes and reducing the total number of reference signals needed in the system
2Loss of time
If URLLC data is transmitted with high priority, then data transmission delay is reduced, but resource allocation complexity increases when sharing with eMBB data
Solution Approach 1:
The patent implements dynamic resource allocation where the system can flexibly adjust resource distribution between URLLC and eMBB services based on current channel conditions and service requirements. The base station dynamically determines whether to allocate dedicated resources to URLLC or allow sharing with eMBB, enabling adaptive response to varying traffic demands
Solution Approach 2:
The patent changes the parameter of reference signal allocation from fixed per-channel assignment to dynamic sharing based on service type. For URLLC services, the system may allocate full reference signal resources to ensure low latency, while for eMBB services, resources may be shared or reduced, optimizing the balance between reliability and resource efficiency
3Reliability
If dedicated resources are allocated for retransmission, then retransmission reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent prepares retransmission resources in advance by maintaining buffer storage for previously transmitted data and pre-configuring reference signal resources that can be quickly allocated for retransmission. This preliminary preparation enables fast retransmission response without requiring extensive real-time resource allocation, thus maintaining both reliability and efficiency
Data Source
AI summary
Disclosed are a communication method 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 disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety-related services, and the like) on the basis of a 5G communication technology and IoT-related technology. In addition, disclosed in the specification are: an adaptive retransmission method and device for delay reduction; a method and a device for selecting radio resource allocation and data size; and a method and a device for performing setting so as to enable different channels to share DMRS with each other.