Wraparound Timing for DRS in Unlicensed mmW
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Solution Overview
Problem
Current wireless communication technologies face challenges in reliably transmitting discovery reference signals (DRS) in unlicensed millimeter wave bands due to medium uncertainty and overhead signaling issues, particularly in higher frequency bands with a large number of candidate positions, which can lead to interrupted or unsuitable transmission of synchronization signal blocks (SSBs).
Innovation Solution
Implementing a wraparound scheme for the timing configuration of DRS windows, where SSBs are repeated at multiple candidate positions within the DRS window, and using parameters like non-LSB of the SSB subcarrier offset parameter and spare bits in the PDCCH configuration to indicate the timing configuration, allowing for improved SSB coverage and reliability in unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DRS transmission methods are used in unlicensed mmW band, then the system can operate in unlicensed spectrum, but the transmission reliability deteriorates due to medium uncertainty and overhead signaling issues
Solution Approach 1:
The patent changes the timing configuration parameters of DRS windows by introducing a wraparound scheme where the timing offset parameter (oressb-Offset) wraps around modulo 64. This parameter change allows the system to indicate timing configurations for a large number of candidate positions without requiring excessive signaling bits, thereby maintaining transmission reliability while controlling overhead signaling complexity in unlicensed mmW bands
Solution Approach 2:
The patent applies preliminary action by pre-configuring the wraparound timing scheme and candidate position patterns before actual DRS transmission. The timing configuration information is prepared in advance using the wraparound formula, allowing the base station to efficiently select appropriate candidate positions without real-time complex calculations, thus improving transmission reliability while reducing signaling overhead
2Area of stationary object
If timing configuration indicates many candidate positions, then SSB coverage is improved, but signaling overhead increases
Solution Approach 1:
The patent transforms the timing configuration indication by applying a wraparound modulo operation to the offset parameter. Instead of directly signaling absolute timing values for many candidate positions, the system uses a wrapped offset parameter that cycles through 64 positions. This parameter transformation enables coverage of multiple candidate positions with reduced signaling bits, improving SSB coverage while minimizing information loss to overhead
Solution Approach 2:
The patent introduces a dimensional transformation by mapping the timing configuration from a linear scale to a modular wraparound scale. The offset parameter operates in a circular dimension (0-63) rather than a linear sequence, allowing the same set of signaling bits to represent multiple candidate positions across different time windows. This dimensional change expands SSB coverage capability without proportionally increasing signaling overhead
3Productivity
If DRS transmission occurs in unlicensed band, then spectrum utilization is improved, but transmission stability deteriorates due to medium uncertainty
Solution Approach 1:
The patent applies preliminary action by pre-establishing multiple candidate positions for DRS transmission within the unlicensed band framework. The wraparound timing configuration is prepared in advance, creating a set of predetermined candidate positions that the base station can select from based on medium conditions. This preliminary preparation allows flexible adaptation to medium uncertainty while maintaining stable spectrum utilization in unlicensed bands
Solution Approach 2:
The patent introduces dynamics by enabling the base station to adaptively select from multiple candidate positions based on real-time medium conditions in unlicensed bands. The wraparound timing scheme provides a dynamic framework where candidate positions can be chosen flexibly without changing the underlying timing configuration structure. This dynamic selection capability maintains transmission stability despite medium uncertainty while preserving improved spectrum utilization characteristics of unlicensed band operation
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive information indicating a timing configuration for candidate positions of a discovery reference signal (DRS) window, wherein the DRS window is within an unlicensed millimeter wave (mmW) band, and wherein the timing configuration provides for repetition of a synchronization signal block (SSB) within the DRS window based at least in part on a wraparound scheme; and scan for the SSB in accordance with the timing configuration. Numerous other aspects are provided.