Adaptive SSB Transmission in DRS Windows for Unlicensed Interference
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Solution Overview
Problem
The challenge of efficiently transmitting and receiving physical channels and signals in wireless communication systems, particularly in unlicensed frequency bands, is exacerbated by interference with existing devices and the need for robust coexistence mechanisms to ensure communication quality.
Innovation Solution
A method where a base station and user equipment adjust their synchronization signal block (SSB) transmission and reception in discovery reference signal (DRS) windows by attempting transmission or reception at later candidate locations if initial attempts fail, with dynamic mapping and indexing of SSBs across DRS windows, and utilizing specific subcarrier spacings to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a base station transmits SSB in unlicensed frequency bands, then communication services can be provided in additional spectrum, but interference with existing devices operating in the same band occurs
Solution Approach 1:
The base station performs channel access procedures and listens for existing transmissions before initiating SSB transmission in unlicensed bands. This preliminary action allows the system to identify and avoid interfering with existing devices, enabling spectrum utilization while mitigating harmful interference effects
Solution Approach 2:
The patent introduces intermediary signaling mechanisms including channel access indicators and SSB transmission status information that mediate between the base station's transmission goals and the protection of existing devices. These intermediaries enable coordinated spectrum sharing by providing information about transmission intentions and actual transmission status to other devices in the network
2Reliability
If the base station attempts SSB transmission at multiple candidate locations in DRS windows, then transmission reliability is improved, but transmission time and complexity increase
Solution Approach 1:
The base station dynamically selects SSB transmission locations within DRS windows based on channel access outcomes and traffic conditions. Instead of using fixed transmission positions, the system adapts transmission timing and location selection, allowing multiple candidate locations to be considered while maintaining efficient operation through dynamic adjustment rather than exhaustive testing
Solution Approach 2:
The base station performs channel access procedures in advance before SSB transmission to determine suitable transmission opportunities. This preliminary channel assessment prevents wasted transmission attempts at inappropriate times, improving reliability by ensuring channel availability while reducing overall transmission time through informed decision-making
3Productivity
If dynamic TDD is used to vary OFDM symbols for uplink and downlink, then data traffic efficiency is improved, but slot configuration complexity increases
Solution Approach 1:
The system dynamically adjusts slot configurations and OFDM symbol allocations based on real-time traffic conditions, allowing the base station to optimize data traffic efficiency by varying uplink and downlink resource distribution. This dynamic adaptation enables the network to respond to changing traffic demands while maintaining manageable complexity through standardized adjustment procedures
Solution Approach 2:
The slot configuration mechanisms are designed to serve multiple functions simultaneously, including traffic adaptation, interference management, and resource allocation. By creating a universal slot configuration framework that handles various traffic patterns and conditions, the system improves data traffic efficiency while avoiding the need for separate complex configuration mechanisms for each scenario
Data Source
AI summary
A base station in a wireless communication system is disclosed. Each base station in the wireless communication comprises: a communication module; and a processor. When the processor attempts to transmit a synchronization signal and PBCH block (SSB) at a SSB transmission candidate position in a discovery reference signal (DRS) transmission window, and fails to transmit an SSB at a first SSB transmission candidate location in a first DRS transmission window, the processor is configured to attempt to transmit the SSB at a second SSB transmission candidate position that is later than the first SSB transmission candidate position in the first DRS transmission window. The DRS transmission window is a time interval in which the base station can transmit the SSB. The SSB transmission candidate position indicates a time point at which the base station can start SSB transmission within the DRS transmission window.