SSB Grouping for Overlapping SSB and Downlink Reception
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently scheduling downlink transmissions over overlapping time resources, leading to delayed communications and reduced spectral efficiency due to the need for non-overlapping resource allocation for synchronization signal blocks (SSBs) and data communications.
Innovation Solution
A method where user equipment (UE) and network nodes associate SSBs into groups with a single physical cell identifier (PCI) and schedule receptions on overlapping time domain resources, allowing simultaneous reception of SSBs and downlink transmissions via different beams, enhancing flexibility in multi-transmission reception point (mTRP) schemes and multiple transmission configuration indicator (TCI) states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-overlapping resource allocation is used for SSBs and data communications, then reception reliability is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent segments SSBs into different groups (first SSB group and second SSB group) associated with different transmission reception points (TRPs). This segmentation allows the UE to handle SSB receptions from multiple TRPs independently, enabling reliable reception through diversity while allowing data communications to utilize overlapping time resources, thus resolving the contradiction between reception reliability and spectral efficiency
Solution Approach 2:
The patent introduces the dimension of multiple TRPs and associates different SSB groups with different TRPs. By adding this spatial dimension, the system can schedule SSBs and data communications on overlapping time resources from different TRPs without interference, maintaining reception reliability while improving spectral efficiency through better resource utilization
2Object-affected harmful factors
If non-overlapping resource allocation is used for SSBs and data communications, then interference avoidance is improved, but resource utilization deteriorates
Solution Approach 1:
By segmenting SSBs into groups associated with different TRPs, the patent enables the UE to distinguish and process SSBs from different sources. This allows data communications to share time resources with SSBs from different TRPs without causing harmful interference, thereby improving resource utilization while maintaining interference avoidance through proper signal differentiation
Solution Approach 2:
The patent introduces the concept of SSB groups as an intermediary layer between individual SSBs and TRPs. This intermediary structure allows the system to manage interference by grouping SSBs according to their TRP origin, enabling efficient resource allocation where data communications can overlap with SSBs from different TRPs without causing harmful interference
3Productivity
If flexible scheduling of overlapping communications is enabled, then spectral efficiency is improved, but reception complexity increases
Solution Approach 1:
The patent segments SSBs into groups associated with different TRPs and provides clear indications to the UE about which SSB group each SSB belongs to. This segmentation approach, combined with explicit group indications, allows the UE to efficiently manage multiple SSB receptions and overlapping data communications without excessive complexity, as the grouping structure provides a systematic way to organize and process signals from multiple sources
Solution Approach 2:
The patent applies preliminary action by providing SSB group indications to the UE in advance before the actual SSB receptions occur. This advance information allows the UE to pre-configure its reception processing, reducing the complexity of handling overlapping communications from multiple TRPs during actual operation, thereby enabling flexible scheduling without excessive reception complexity
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication that associates a first synchronization signal block (SSB) to a first SSB group and a second SSB to a second SSB group, the first SSB group and the second SSB group associated with a single physical cell identifier (PCI). The UE may receive one or more scheduling indications that schedule reception of the first SSB, on a first set of one or more time domain resources, and schedule reception of a downlink transmission, on a second set of one or more time domain resources that at least partially overlap with the first set of one or more time domain resources, via a beam associated with the second SSB of the second SSB group. Numerous other aspects are described.