NR-U Synchronization Signal Modes for CA, DC, and SA
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Solution Overview
Problem
The existing DRS transmission manner in the LTE-LAA system is inadequate for the diverse network deployment scenarios introduced by new radio (NR) technology, such as carrier aggregation, dual connectivity, and standalone deployments, leading to synchronization and RRM measurement challenges on unlicensed spectrums.
Innovation Solution
A method and apparatus for signal transmission that adapts synchronization signal transmission modes based on network deployment scenarios, utilizing different configurations of synchronization signals and PBCHs on licensed and unlicensed carriers to ensure accurate synchronization and RRM measurements, including specific configurations for CA, DC, and SA scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing DRS transmission manner in LTE-LAA system is used, then synchronization and RRM measurement can be achieved on unlicensed spectrum, but it cannot meet the requirements of diverse NR network deployment scenarios such as carrier aggregation, dual connectivity, and standalone deployments
Solution Approach 1:
The patent implements dynamic adaptation of synchronization signal transmission modes based on network deployment scenarios. The terminal device determines whether to use first transmission mode (receiving only synchronization signals on unlicensed carrier) or second transmission mode (receiving synchronization signals and PBCH on unlicensed carrier) according to the specific deployment scenario, enabling the system to dynamically adjust to different network configurations while maintaining reliable synchronization and RRM measurements
Solution Approach 2:
The patent changes the transmission mode parameter based on network deployment scenarios. By switching between different transmission modes (first mode with only synchronization signals, second mode with synchronization signals and PBCH), the system adapts to various NR deployment scenarios including carrier aggregation, dual connectivity, and standalone deployments, resolving the contradiction between adaptability and reliability
2Measurement precision
If synchronization signals are transmitted only on unlicensed carrier, then terminal can achieve synchronization on unlicensed spectrum, but terminal cannot obtain system information for proper data reception and transmission
Solution Approach 1:
The patent makes the unlicensed carrier serve multiple functions depending on the transmission mode. In the second transmission mode, the unlicensed carrier not only provides synchronization signals for accurate synchronization but also carries PBCH for system information delivery, enabling the terminal to both synchronize and receive system information necessary for proper data reception and transmission on the unlicensed carrier
3Loss of information
If PBCH is transmitted on unlicensed carrier, then terminal can obtain system information, but transmission resource consumption increases
Solution Approach 1:
The patent dynamically adjusts PBCH transmission based on network deployment scenarios. The network device determines whether to transmit PBCH on the unlicensed carrier according to the specific scenario, and the terminal device accordingly determines whether to receive PBCH. This dynamic approach ensures system information is available when needed while avoiding unnecessary transmission resource consumption in scenarios where PBCH is not required
Data Source
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AI summary
The present invention discloses a signal transmission method and apparatus, and a computer storage medium. The method includes: a terminal device determines a synchronization signal transmission mode on a first carrier, where the synchronization signal transmission mode is a first transmission mode or a second transmission mode; and the terminal device receives information on the first carrier according to the synchronization signal transmission mode. A network device determines a synchronization signal transmission mode on a first carrier, where the synchronization signal transmission mode is a first transmission mode or a second transmission mode; and the network device sends information to a terminal device on the first carrier according to the synchronization signal transmission mode.