eMBB Reference Signal Recovery from URLLC Puncturing
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Solution Overview
Problem
Current downlink dynamic multiplexing of URLLC/eMBB in 5G wireless communication networks does not provide an adequate level of reference signal (RS) recovery for efficient operation, leading to performance issues in eMBB applications.
Innovation Solution
The proposed schemes modify existing RS patterns before puncturing occurs to minimize the impact of URLLC traffic on eMBB RS symbols. These schemes include an indication-based dynamic RS pattern scheme, a block-based scheme, and an over-provisioning scheme, as well as the option to disable time-domain orthogonal cover code (TD-OCC) for RSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic multiplexing of URLLC and eMBB is implemented, then system flexibility and resource utilization are improved, but reference signal recovery performance deteriorates
Solution Approach 1:
The reference signal resources are segmented into multiple parts: original RS positions and additional RS positions. When URLLC punctures eMBB data, the eMBB UE can still recover RS information from both original and additional positions, ensuring reliable channel estimation while allowing dynamic multiplexing operations.
Solution Approach 2:
The base station pre-configures additional reference signal positions and patterns before URLLC transmission occurs. This preliminary preparation ensures that when dynamic multiplexing requires puncturing, the eMBB reference signals are already protected or restored at alternative positions, maintaining recovery performance.
2Reliability
If URLLC traffic is prioritized with puncturing capability, then latency and reliability for URLLC are improved, but eMBB performance deteriorates
Solution Approach 1:
The system applies different quality levels to different signal types: URLLC signals receive high priority with guaranteed transmission, while eMBB signals experience selective puncturing only in data regions. Reference signal positions are protected with higher quality assurance, ensuring eMBB channel estimation performance remains intact even when data throughput is reduced.
Data Source
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AI summary
Various aspects are described for schemes that address the potential puncturing of important reference signals (RSs) for enhanced mobile broadband (eMBB) applications, such as demodulation reference signal (DMRS), channel state information reference signal (CSIRS), tracking reference signal, and general reference signal. The schemes can be used for recovery of eMBB's RS puncturing from dynamic multiplexing of ultra-reliable-low-latency communications (URLLC) and eMBB. The schemes include a block-based scheme and an over-provisioning scheme. The schemes modify an existing RS pattern before puncturing occurs in response to a presence of the URLLC traffic. In addition, there can be an option not to use (e.g., disable) time-domain orthogonal cover code (TD-OCC) for the RSs.