SS/PBCH Block Detection Under LBT-Driven Position Changes
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Solution Overview
Problem
The challenge in wireless communication networks is determining the appropriate method for SS/PBCH block detection, particularly in scenarios where Listen Before Talk (LBT) procedures affect the transmission of synchronization signals, leading to inefficiencies in power consumption and network performance.
Innovation Solution
A method is provided for a communication terminal to determine whether SS/PBCH blocks are transmitted using fixed or non-fixed methods based on network conditions, allowing for efficient power usage and improved network performance by selecting the appropriate detection method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE assumes fixed SS/PBCH block positions according to Rel-15, then power consumption is reduced and processing is simplified, but the system cannot adapt to LBT failures and flexible transmissions in Rel-16
Solution Approach 1:
The patent applies dynamics by making the SS/PBCH block position configuration adaptive rather than static. The network can dynamically indicate whether fixed or flexible positions are used through signaling (e.g., ssb-PositionInBurst parameter), allowing the UE to adjust its detection method based on current transmission conditions, thereby resolving the contradiction between power efficiency and adaptability to LBT procedures
Solution Approach 2:
The patent changes the parameter of SS/PBCH block position from a fixed specification-defined value to a configurable parameter that can be indicated by the network. By introducing parameters like ssb-PositionInBurst and different information element structures for fixed versus flexible positions, the system enables the UE to adapt its detection behavior based on the indicated parameter state, balancing power consumption and adaptability
2Adaptability or versatility
If the UE supports flexible SS/PBCH block positions according to Rel-16, then adaptability to LBT procedures is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements self-service by enabling the network to automatically indicate the transmission method through existing signaling mechanisms. The UE simply needs to read the indicated parameter (ssb-PositionInBurst or information element structure) and apply the corresponding detection method, without requiring complex autonomous decision-making logic, thus reducing UE complexity while maintaining flexibility
Solution Approach 2:
The patent segments the detection process into two distinct paths: one for fixed positions (Rel-15 method) and one for flexible positions (Rel-16 method). By using different information element structures and signaling indicators to distinguish between these two cases, the UE can selectively apply only the necessary detection logic for the current transmission type, reducing overall processing complexity compared to supporting both methods simultaneously without clear segmentation
3Reliability
If the network transmits SS/PBCH blocks at flexible positions to account for LBT failures, then reliability is improved, but the UE cannot reliably determine detection parameters
Solution Approach 1:
The patent introduces an intermediary signaling mechanism (the ssb-PositionInBurst parameter and information element structure indications) that conveys transmission method information from the network to the UE. This intermediary carries the necessary detection parameters without requiring separate dedicated signaling, thereby maintaining reliability while preventing information loss about the transmission method
Solution Approach 2:
The patent makes the existing information element structures multi-functional by designing them to represent both fixed and flexible position configurations. The same signaling framework (PBCH payload, information elements) serves dual purposes: indicating fixed positions when using Rel-15 method and indicating flexible positions when using Rel-16 method, thus preventing information loss while maintaining a universal signaling approach
Data Source
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AI summary
An approach for synchronization signal and Physical Broadcast Channel, SS/PBCH, block management is provided. A network node determines whether a network condition is met, signals to a communication terminal to apply a first detection method for SS/PBCH block detection when the network condition is determined to be met, signals to the communication terminal to apply a second detection method for SS/PBCH block detection when the network condition is determined not be met, and transmits SS/PBCH blocks according to the second SS/PBCH block detection method, or according to the first SS/PBCH block detection method, based on whether the network condition is met. The communication terminal receives the signalling from the network node associated with the communication network, determines whether the indicated SS/PBCH block detection method is a first SS/PBCH block detection method or a second SS/PBCH block detection method based on the received signalling, and applies, based on the determination, the first or the second SS/PBCH block detection method for SS/PBCH block detection.