Initial Access Signaling With Variable SSB Discovery Bursts
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Solution Overview
Problem
In higher frequency bands, existing wireless communication networks face challenges in managing control frame transmissions due to restrictions on the number of control frames, particularly for 120 kHz subcarrier spacing, leading to encumbrance issues that are not addressed by listen-before-talk protocols.
Innovation Solution
Implementing techniques that allow base stations to vary the number of synchronization signal blocks (SSBs) transmitted by indicating the enablement or disablement of discovery burst transmission windows (DBTWs), along with the status of listen-before-talk (LBT) and licensed/unlicensed bands, to optimize SSB transmission and ensure compliance with 10% control frame transmission standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of control frames is increased to improve synchronization signaling capacity, then more synchronization signal blocks can be transmitted, but control frame transmission restrictions in higher frequency bands are violated
Solution Approach 1:
The patent divides the control frame transmission into multiple discovery burst transmission windows (DBTWs), each containing a subset of synchronization signal blocks. This segmentation allows the system to transmit a large total number of SSBs (improving synchronization capacity) while keeping the number of control frames within each individual transmission window below the 10% threshold (maintaining compliance with transmission standards).
Solution Approach 2:
The patent dynamically configures the number of SSBs transmitted in each DBTW based on network conditions and requirements. The base station can adjust the SSB count per DBTW to optimize synchronization performance while ensuring that the dynamic adjustments never exceed the control frame transmission restrictions, thus balancing capacity improvement with standard compliance.
2Reliability
If listen-before-talk protocols are applied to manage control frame transmissions, then transmission collisions are reduced, but the protocols do not address encumbrance issues in higher frequency bands
Solution Approach 1:
The patent changes the parameter of control frame transmission by introducing discovery burst transmission windows with specific configurations tailored for higher frequency bands. Instead of relying on generic LBT protocols, the system modifies transmission parameters (DBTW duration, SSB count per DBTW, frequency allocation) to specifically address the encumbrance issues in higher frequency bands, making the solution adaptable and versatile for different frequency ranges.
Data Source
AI summary
Techniques described herein may enable base stations and user equipment (UEs) to implement initial access related signaling that may vary the number of synchronization signal blocks (SSBs) transmitted by a base station to better ensure that control frame transmissions (e.g., 120 kilohertz (kHz) subcarrier spacing (SCS) transmissions) are not overly encumbered by SSBs. A base station may indicate whether a discovery burst transmission window (DBTW) is enabled or disabled, whether listen-before-talk (LBT) is enabled or disabled, and whether transmissions correspond to a licensed band, unlicensed band, or combination thereof. The base station may also indicate a number of candidate SSBs per DBTW and/or which SSBs/SSB groups are active (e.g., actually transmitted) per discovery burst (DB).