SSB Measurement Gap Configuration for Beam-Based Sync Reception
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Solution Overview
Problem
Wireless communication terminals face challenges in receiving synchronization signal blocks (SSBs) during measurement periods, leading to reduced data transmission rates and potential reception difficulties due to estimation errors, especially in non-terrestrial networks.
Innovation Solution
A method and apparatus for configuring a measurement gap to optimize SSB reception by transmitting and receiving SSBs through different beams based on gap configuration, using bitmap information and parameters like gap offset, measurement gap length, and timing advance, allowing successful measurement reporting and acknowledgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs frequent or prolonged measurement operations to measure SSB strengths from adjacent cells, then the measurement accuracy and reliability are improved, but the data transmission rate is reduced due to the terminal being unable to receive data during measurement periods
Solution Approach 1:
The base station performs preliminary actions by configuring measurement gap information in advance through RRC signaling, including gap setup information with gap configuration parameters. This allows the terminal to know beforehand when measurement operations will occur, enabling the base station to proactively manage measurement timing and minimize impact on data transmission.
Solution Approach 2:
The measurement gap configuration is made dynamic and adaptable. The base station can configure different measurement gap patterns based on terminal capabilities, network conditions, and measurement requirements. The gap configuration includes flexible parameters such as gap offset, measurement gap length, and measurement gap repetition periodicity that can be adjusted to balance measurement reliability and data transmission efficiency.
2Loss of energy
If the base station limits the number of SSBs transmitted within a measurement period, then resource utilization is improved, but the terminal may face difficulties in receiving all necessary SSBs within the configured measurement period
Solution Approach 1:
The measurement gap configuration is segmented into multiple parameters that can be independently optimized. The gap setup information includes segmented elements such as gap offset, measurement gap length, and measurement gap repetition periodicity. This segmentation allows the base station to control SSB transmission in a structured manner, ensuring all necessary SSBs are transmitted while minimizing resource waste through precise timing control.
Solution Approach 2:
The base station utilizes parameter changes to optimize SSB transmission. By adjusting measurement gap parameters (gap offset, length, repetition periodicity) and SSB transmission parameters (timing advance, beam configuration), the system can adapt to different scenarios. This includes configuring multiple SSBs at different positions within the measurement gap repetition periodicity to ensure reliable reception without excessive resource consumption.
3Productivity
If the terrestrial base station configures measurement operations based on estimated satellite beam region, then the measurement efficiency is improved, but SSB reception may encounter difficulties due to estimation errors
Solution Approach 1:
The base station performs preliminary estimation of the satellite beam region and configures measurement operations in advance based on this estimation. The gap setup information includes preliminary configuration of measurement timing and beam directions. This preliminary action enables efficient measurement operations while the system remains prepared to adapt if estimation errors occur.
Solution Approach 2:
The measurement configuration is made dynamic to accommodate estimation uncertainties. The base station configures multiple SSBs at different positions within the measurement gap repetition periodicity, allowing the terminal to measure SSBs from multiple beam directions. The system can dynamically adjust which SSBs are actually received and measured based on the actual satellite beam position, thereby maintaining reliability despite initial estimation errors.
Data Source
AI summary
A method of a terminal, according to an exemplary embodiment of the present disclosure, may comprise: receiving, from a base station, radio resource control (RRC) signaling including measurement gap configuration information (MeasGapConfig) including gap setup information (gapSAT) of synchronization signal blocks (SSBs); obtaining transmission position information of first SSBs and second SSBs transmitted in different positions based on gap configuration (GapConfig) of the gap setup information; receiving the first SSBs and the second SSBs through different beams from the base station based on the obtained transmission position information; and measuring reception powers of the received first SSBs and second SSBs.