On-Demand SSB Triggering via PDSCH Indication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently triggering on-demand synchronous signal/physical broadcast channel block (SSB) or system information block 1 (SIB1) in a timely manner, particularly in 5G/NR mobile communications.
Innovation Solution
The proposed solution involves a user equipment (UE) and a base station (BS) that determine an indication in a first physical downlink shared channel (PDSCH) to activate a set of SS/PBCH blocks for transmission. The UE calculates a time domain offset with respect to the first PDSCH and determines that the SS/PBCH blocks are to be transmitted after this offset, allowing for on-demand triggering of SSB or SIB1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If on-demand SSB or SIB1 triggering is implemented, then system responsiveness and latency are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The network pre-configures triggering conditions, SSB resources, and time domain offsets in system information or RRC signaling before they are needed. When a triggering event occurs (such as handover or beam failure), the UE can immediately activate pre-configured SSB resources without waiting for network allocation, significantly reducing latency while maintaining manageable device complexity through standardized configuration procedures
Solution Approach 2:
The patent implements dynamic SSB activation where the UE can switch between periodic and on-demand SSB transmission modes based on network conditions and service requirements. The time domain offset mechanism allows flexible timing adjustment between PDSCH reception and SSB transmission, enabling the system to adapt to varying latency requirements while managing device complexity through configurable parameters
2Productivity
If SSB transmission is activated after PDSCH reception, then resource allocation efficiency is improved, but timing synchronization challenges arise
Solution Approach 1:
The network provides pre-configuration of time domain offsets between PDSCH reception and SSB transmission in advance through system information or RRC signaling. This preliminary setup establishes clear timing relationships before actual transmission occurs, improving resource allocation efficiency while maintaining precise timing synchronization through predetermined parameters
Solution Approach 2:
The patent introduces configurable time domain offset parameters that can be adjusted based on specific network conditions and service requirements. By changing these timing parameters dynamically, the system optimizes both resource allocation efficiency and timing synchronization precision for different scenarios such as handover, beam failure recovery, or periodic updates
Data Source
AI summary
Methods and apparatuses for an operation for triggering on-demand synchronous signal/physical broadcast channel block (SSB) or a system information block 1 (SIB1) in a wireless communication system. A method of a user equipment (UE) in a wireless communication system includes receiving a first physical downlink shared channel (PDSCH) from a base station (BS) and determining, based on an indication in the first PDSCH, that a set of synchronization signals and physical broadcast channel (SS/PBCH) blocks is activated for transmission from the BS. The method further includes determining a time domain offset with respect to the first PDSCH, determining that the set of SS/PBCH blocks is to be transmitted after the time domain offset and receiving a SS/PBCH block in the set of SS/PBCH blocks.