SSB Timing Anchors for Cross-SCS Beam Alignment
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently aligning beams for transmissions using different subcarrier spacings, which can impact synchronization and initial access processes.
Innovation Solution
The method involves receiving and transmitting synchronization signal blocks (SSBs) and initial access transmissions with different subcarrier spacings, where the time location of initial access transmissions is based on the time location of SSB transmissions, facilitating beam alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different subcarrier spacings are used for SSB and initial access transmissions, then spectral efficiency and adaptability are improved, but beam alignment and synchronization become more difficult
Solution Approach 1:
The patent applies preliminary action by establishing beam alignment relationships before actual data transmissions. The network entity determines time locations for initial access transmissions based on SSB time locations in advance, and informs UEs of these relationships through RRC signaling or system information. This pre-established timing relationship ensures that beams are properly aligned before transmissions occur, resolving the reliability issue while maintaining spectral efficiency adaptability through different SCS configurations.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting subcarrier spacing values for different transmission types. The network entity can configure different SCS parameters for SSB transmissions versus initial access transmissions based on channel conditions, frequency bands, and service requirements. This parameter flexibility improves spectral efficiency adaptability while the patent compensates for the resulting beam alignment challenges through explicit timing relationship signaling and beam management procedures.
2Adaptability or versatility
If multiple SCS configurations are supported, then system versatility is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by creating a unified beam management framework that handles multiple SCS configurations through common procedures. The network entity uses a single RRC parameter structure (e.g., ssb-PositionInFdmPattern, initialAccess-SCS) to manage timing relationships across different SCS values. This multi-functional approach allows the same beam alignment mechanisms to work regardless of which SCS configuration is active, reducing device complexity while maintaining SCS versatility.
Solution Approach 2:
The patent reduces device complexity through preliminary configuration actions. The network entity pre-determines and signals the timing relationships between SSB and initial access transmissions for multiple SCS configurations before the UE needs to perform actual beam alignment. The UE receives these configurations via RRC signaling in advance, eliminating the need for complex real-time calculations and reducing the instantaneous processing complexity at the device level.
3Reliability
If beam time locations are aligned between different SCS transmissions, then synchronization is improved, but flexibility in transmission scheduling is reduced
Solution Approach 1:
The patent applies dynamics by making beam timing relationships configurable rather than fixed. The network entity can dynamically adjust the timing offset parameters (e.g., timeOffsetForInitialAccess) based on current network conditions, traffic patterns, and scheduling requirements. This allows the system to maintain synchronization accuracy through defined timing relationships while adapting the specific timing values to optimize scheduling flexibility for different service scenarios.
Solution Approach 2:
The patent uses parameter changes to balance synchronization and flexibility. The network entity configurable parameters such as ssb-PositionInFdmPattern and initialAccess-SCS allow dynamic adjustment of timing relationships. When strict synchronization is needed, parameters are set to align time locations; when scheduling flexibility is prioritized, parameters can be adjusted to create controlled offsets. This parameter-based control enables the system to adapt between synchronization accuracy and scheduling flexibility based on operational requirements.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, one or more synchronization signal block (SSB) transmissions associated with a first subcarrier spacing (SCS). The UE may receive, from the network entity, one or more initial access transmissions associated with a second SCS, wherein a time location of an initial access transmission, of the one or more initial access transmissions, that uses a beam is based at least in part on a time location of an SSB transmission, of the one or more SSB transmissions, that uses the beam. Numerous other aspects are described.