MAC CE-Controlled On-Demand SSB for Secondary Cell Synchronization
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing synchronization signal block (SSB) transmissions in secondary cells (SCells), particularly in high-frequency bands, to support the increasing demand for wireless data traffic and diverse vertical applications in 5G/NR systems.
Innovation Solution
A user equipment (UE) and base station (BS) are configured to transmit and receive messages for on-demand SSB transmission in SCells, with a processor determining activation based on Medium Access Control (MAC) control elements, enabling dynamic management of SSB transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSB transmission is continuously transmitted in SCells, then synchronization coverage is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic SSB transmission in SCells instead of continuous transmission. The base station transmits SSB at configured periodic intervals, and the UE is configured to measure SSB at these periodic occasions. This periodic action maintains synchronization coverage while significantly reducing energy consumption compared to continuous transmission.
Solution Approach 2:
The patent introduces dynamic activation and deactivation of SSB transmission in SCells through MAC CE signaling. The base station can activate SSB transmission when needed and deactivate it when not required, making the system adaptive to changing conditions. This dynamic control allows the network to balance between maintaining synchronization coverage and reducing energy consumption based on actual service requirements.
2Reliability
If SSB transmission is activated in all SCells, then synchronization reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by enabling SSB transmission selectively in specific SCells rather than uniformly across all SCells. The base station configures SSB transmission parameters (periodicity, subcarrier offset, frequency location) individually for each SCell based on local requirements. This allows synchronization reliability to be improved in cells where it is needed while avoiding unnecessary complexity in cells where it is not required.
Solution Approach 2:
The patent introduces dynamic activation and deactivation of SSB transmission in SCells through MAC CE signaling. The base station can activate SSB transmission when needed and deactivate it when not required, making the system adaptive to changing conditions. This dynamic control allows the network to balance between maintaining synchronization coverage and reducing energy consumption based on actual service requirements.
3Productivity
If on-demand SSB transmission is implemented, then radio interface efficiency is improved, but measurement precision requirements increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring the UE with SSB measurement parameters including frequency location, subcarrier offset, and periodicity before actual SSB transmission occurs. The base station provides RRC configuration that prepares the UE to accurately measure SSB when it is transmitted. This preliminary configuration ensures that when on-demand SSB transmission occurs, the UE is already prepared to perform precise measurements without requiring complex real-time adjustments.
Data Source
AI summary
A user equipment (UE) includes a transceiver. The transceiver is configured to receive, from a base station (BS), a message including a configuration for on-demand synchronization signal block (SSB) transmission for one or more secondary cells (SCells), and receive, from the BS, a medium access control (MAC) control element (CE) indicating whether on-demand SSB transmission is activated for the one or more SCells. The UE also includes a processor operably coupled to the transceiver. The processor is configured to determine, based on the MAC CE, whether on-demand SSB transmission is activated for an SCell configured with on-demand SSB transmission, and in response to a determination that on-demand SSB transmission is activated for the SCell, measure the on-demand SSB transmission for the SCell.