SSB Multiplexing Patterns for Low-Latency Remaining SI Delivery
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing SSB overhead while maintaining low initial access latency and network energy efficiency, particularly in scenarios where frequent SSB transmissions are required for cell detection and synchronization.
Innovation Solution
The proposed solution involves multiplexing PDCCH and PDSCH transmissions with PSS, SSS, and PBCH transmissions, where the PSS is disjoint from the PBCH transmission, allowing for partial PDCCH transmission during the same symbol as PSS and full PDCCH transmission across disjoint symbols, enabling efficient decoding of additional SI without increasing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If SSB transmissions are reduced to lower network energy consumption, then energy efficiency is improved, but initial access latency increases and synchronization reliability deteriorates
Solution Approach 1:
The patent segments the SSB transmission into two distinct parts: a reduced set of essential SSB transmissions for basic synchronization, and a separate PDSCH transmission for carrying remaining system information. This segmentation allows the network to reduce overall SSB transmission frequency and energy consumption while maintaining essential synchronization functions through the reduced SSB set, and delivering additional system information through the scheduled PDSCH transmissions.
Solution Approach 2:
The patent implements periodic PDSCH transmissions scheduled at specific intervals to deliver remaining system information. The PDCCH provides scheduling information that indicates when PDSCH transmissions will occur, allowing UEs to efficiently monitor for system information updates without requiring continuous SSB transmissions. This periodic action reduces energy consumption compared to frequent SSB transmissions while maintaining timely information delivery.
2Use of energy by stationary object
If SSB transmissions are reduced to improve energy efficiency, then energy consumption is lowered, but reliability of cell detection and synchronization deteriorates
Solution Approach 1:
The patent segments the system information delivery into two parts: essential synchronization information contained in the reduced SSB transmissions, and remaining system information delivered through scheduled PDSCH transmissions. This segmentation ensures that critical synchronization reliability is maintained through the reduced SSB set while energy consumption is lowered by eliminating redundant information transmissions.
Solution Approach 2:
The patent introduces PDCCH as an intermediary that provides scheduling information for PDSCH transmissions. The PDCCH carries information about when and how UEs should monitor for remaining system information, enabling reliable information delivery without requiring UEs to continuously monitor all SSB transmissions. This intermediary mechanism maintains reliability while reducing the overall transmission burden.
3Productivity
If PDCCH and PDSCH are multiplexed with SSB transmissions, then transmission efficiency is improved, but complexity of signal processing increases
Solution Approach 1:
The patent merges PDCCH and PDSCH transmissions with SSB transmissions in the time-frequency domain. The PDCCH is transmitted in symbols overlapping with SSB symbols, and the PDSCH is transmitted in symbols subsequent to the SSB transmission. This merging allows efficient use of available resources and improves transmission efficiency by delivering multiple types of information simultaneously without requiring separate dedicated transmission resources.
Solution Approach 2:
The patent employs preliminary action by having the PDCCH provide scheduling information in advance before the actual PDSCH transmission occurs. The PDCCH carries indications about when and how UEs should monitor for remaining system information on the PDSCH, allowing UEs to prepare their reception accordingly. This preliminary scheduling reduces the need for continuous monitoring and simplifies the processing complexity by providing clear advance instructions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may monitor for synchronization signal blocks (SSBs) from a cell to perform an initial cell search. The UE may use the primary synchronization signal (PSS) and secondary synchronization signal (SSS) of an SSB to synchronize timing with the cell and to decode the physical broadcast channel (PBCH) of the SSB, which may include system information (SI) for the cell and may include scheduling information for a physical downlink control channel (PDCCH) occasion for the UE to monitor for additional SI. The PDCCH and the PDSCH which convey additional SI may be multiplexed with the PSS, SSS, and/or PBCH, where at least the PSS is disjoint from the corresponding PBCH. For example, the PSS may be disjoint from the PBCH, and the PDSCH may be received during the same symbols as the PBCH and/or the SSS.