Base Station SSB Position Grouping for Shared Spectrum LBT
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently implementing downlink and interlace uplink transmissions, particularly in shared spectrum channel access scenarios, where resource mapping and allocation are not effectively managed.
Innovation Solution
The proposed solution involves a base station that divides candidate Synchronization Signal Block (SSB) positions into groups and communicates this information to user equipment (UE). The base station performs a listen-before-talk (LBT) procedure and transmits SSBs on determined candidate SSB positions, using techniques such as Master Information Block (MIB), Physical Broadcast Channel (PBCH), and System Information Block 1 (SIB1) for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If candidate SSB positions are transmitted without grouping in shared spectrum, then complete SSB information can be provided to UE, but resource allocation efficiency deteriorates and LBT success probability decreases
Solution Approach 1:
The patent divides candidate SSB positions into multiple groups (first group, second group, etc.) where each group contains a subset of candidate positions. The base station transmits information about multiple groups but only activates one group based on LBT outcomes. This segmentation allows efficient resource utilization while maintaining the ability to provide complete SSB information when needed.
2Reliability
If base station performs LBT procedure before SSB transmission in shared spectrum, then channel access compliance is achieved, but transmission delay increases
Solution Approach 1:
The base station performs the LBT procedure in advance before determining which SSB positions to transmit. The results of the LBT procedure are stored and used to select appropriate candidate SSB positions from pre-defined groups. This preliminary action ensures channel access compliance is met while reducing actual transmission delay by having positions ready in advance.
3Adaptability or versatility
If all candidate SSB positions are made available to UE, then UE can select optimal position, but resource wastage increases in shared spectrum
Solution Approach 1:
The patent implements a dynamic resource allocation mechanism where the base station determines which SSB position groups to activate based on LBT outcomes and transmission conditions. While UE is configured with knowledge of multiple candidate positions across different groups, only the selected group's positions are actually transmitted and made available for UE selection. This dynamic approach maintains UE flexibility while preventing resource wastage by only activating necessary positions.
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing downlink transmission and interlace uplink transmission. For example, some aspects of this disclosure relate to a base station including a transceiver configured to communicate over a wireless network with a user equipment (UE) and a processor communicatively coupled to the transceiver. The processor divides a plurality of candidate Synchronization Signal Block (SSB) positions in a time window into a plurality of groups and communicates, using the transceiver, information associated with the plurality of groups of candidate SSB positions to the UE. The processor further performs a listen-before-talk (LBT) procedure. In response to the LBT procedure being successful, the processor determines a first group of the plurality of groups and transmits, using the transceiver, one or more SSBs on one or more candidate SSB positions of the first group to the UE.