Base Station SSB Transmission Pattern for Shared Spectrum LBT
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication networks, especially in shared spectrum environments, base stations may miss opportunities to transmit synchronization signal blocks (SSBs) due to channel access delays, leading to inefficient system synchronization operations.
Innovation Solution
Implementing a Listen-Before-Talk (LBT) procedure to determine a pattern of SSB transmissions after obtaining access to a wireless communication channel, allowing for the transmission of missed SSBs at the earliest available opportunity or according to a predefined pattern, along with transmitting a wrap-around index or timing offset to facilitate system timing acquisition by user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a base station performs LBT procedure in shared spectrum environment, then channel access is obtained, but SSB transmission opportunities may be missed due to access delays
Solution Approach 1:
The base station performs LBT procedure in advance before SSB transmission opportunities and prepares transmission patterns proactively. When channel access is obtained, the base station immediately transmits SSBs according to predetermined patterns, reducing delays caused by waiting for channel availability.
Solution Approach 2:
The SSB transmission pattern is made dynamic and adaptable based on LBT outcomes. The base station can adjust the transmission pattern to accommodate missed opportunities by transmitting additional SSBs in subsequent available slots, transforming a static transmission schedule into a flexible one that responds to channel conditions.
2Object-affected harmful factors
If SSB transmissions are dropped due to missed LBT opportunities, then channel access conflicts are avoided, but synchronization efficiency deteriorates
Solution Approach 1:
When an SSB transmission opportunity is missed due to LBT failure, the base station discards that specific transmission instance but recovers by transmitting the SSB in a subsequent available slot. This ensures that synchronization information is eventually delivered without causing channel conflicts, maintaining both conflict avoidance and synchronization efficiency.
Solution Approach 2:
The base station employs periodic SSB transmission opportunities within a DMTC window, allowing multiple attempts to transmit synchronization information. If one opportunity is missed, subsequent periodic opportunities provide additional chances to deliver SSBs, ensuring synchronization efficiency while respecting channel access constraints.
3Measurement precision
If the number of SSB transmissions is maintained within DMTC window, then measurement timing is preserved, but transmission flexibility is reduced
Solution Approach 1:
The SSB transmission burst is segmented into multiple individual SSB transmissions within the DMTC window. Each SSB can be independently scheduled and transmitted based on channel availability, allowing the system to maintain the overall measurement timing structure while providing flexibility in the execution of individual transmission instances.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A base station may perform a Listen-Before-Talk (LBT) procedure to obtain access to a wireless communication channel. The base station may then determine a pattern of synchronization signal block (SSB) transmissions based on an outcome of the LBT procedure and transmit the pattern of SSB transmissions after obtaining access to the wireless communication channel. The outcome of the LBT procedure may include obtaining access to the wireless communication channel after a missed opportunity for at least one SSB transmission in a discovery reference signal (DRS) measurement timing configuration (DMTC) window. A user equipment (UE) may determine system timing based on a received SSB transmission.