NR BWP Scheduling, HARQ-ACK, and DM-RS Multiplexing for URLLC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 5G NR networks face challenges in scheduling and HARQ-ACK feedback for URLLC, multiplexing schemes for control/data channels, and synchronization signal blocks, particularly in scenarios involving multiple bandwidth parts (BWPs), leading to increased implementation complexity and power consumption.
Innovation Solution
Implement mechanisms for scheduling data transmission across multiple BWPs using a single numerology, enhance HARQ-ACK feedback through early termination and frequency hopping, and optimize DM-RS multiplexing to improve efficiency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple BWPs are configured for different numerologies to serve diverse services (eMBB and URLLC), then service adaptability is improved, but UE implementation complexity increases
Solution Approach 1:
The system bandwidth is segmented into multiple bandwidth parts (BWPs), each configured with different numerologies (subcarrier spacings) to serve different services. This allows eMBB services to use larger numerologies for higher data rates while URLLC services use smaller numerologies for lower latency, resolving the contradiction by segmenting the frequency spectrum into specialized segments.
Solution Approach 2:
A single UE is configured to support multiple BWPs with different numerologies simultaneously, enabling the UE to universally serve multiple service types (eMBB and URLLC) through a unified device architecture. The UE can switch between different numerologies based on the active BWP, achieving multi-functionality without requiring separate devices for each service type.
2Adaptability or versatility
If multiple BWPs with different numerologies are simultaneously active, then service flexibility is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between different active BWPs based on service requirements and channel conditions. The UE can transition from a default BWP to an activated BWP when needed, and the network can dynamically adjust which BWP is active based on current traffic patterns, reducing power consumption by keeping only necessary BWPs active rather than maintaining all BWPs simultaneously.
Solution Approach 2:
The network configures periodic activation patterns for different BWPs, where BWPs are activated and deactivated in periodic cycles based on service needs. This allows the system to maintain service flexibility by periodically switching between numerologies while reducing power consumption by deactivating BWPs when not currently needed, rather than maintaining all BWPs in a continuous active state.
3Productivity
If DM-RS and PDSCH are multiplexed in the same time resources, then spectral efficiency is improved, but channel estimation accuracy deteriorates
Solution Approach 1:
Different DM-RS patterns are configured for different BWPs and numerologies, with each BWP having optimized DM-RS density and positioning tailored to its specific numerology. This allows the system to maintain adequate channel estimation accuracy for each BWP while multiplexing DM-RS and PDSCH in the same time resources across different BWPs, achieving local optimization without compromising overall spectral efficiency.
Data Source
AI summary
An apparatus may be an apparatus of a User Equipment (UE). The apparatus may comprise processing circuitry configured to: receive a control signal, from a base station, on a physical downlink control channel (PDCCH) including scheduling information for a data signal on a physical downlink shared channel (PDSCH), receive one or more demodulation reference signal (DMRS) symbols, from the base station, based on a number of symbols occupied by the PDSCH, a position of the symbols occupied by the PDSCH, and a position of symbols occupied by the PDCCH, decode the control signal on the PDCCH and the one or more DMRS symbols, and obtain the data signal on the PDSCH based at least in part on the PDCCH and the one or more DMRS symbols.