Control Channel Transmission for SSB Measurement in Shared Spectrum
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Solution Overview
Problem
In wireless communication systems, particularly in shared spectrum environments, user equipment (UE) devices face challenges in efficiently performing radio link and radio resource measurements due to the need to monitor extensive discovery reference signal windows, leading to increased power consumption and inefficiency.
Innovation Solution
The method involves detecting a control channel transmission during a configured discovery reference signal window and measuring synchronization signal blocks (SSBs) at expected positions within a maximum SSB burst length, allowing the UE to reduce power consumption by stopping measurements once the expected SSBs are measured, and enabling the base station to transmit SSBs as early as possible after obtaining channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors the entire discovery reference signal window for SSBs, then the reliability of SSB detection is improved, but the power consumption increases
Solution Approach 1:
The base station transmits a control channel transmission (e.g., COT-SI) before the SSBs to indicate the maximum SSB burst length and/or channel occupancy time. This preliminary action allows the UE to know in advance how long to monitor for SSBs, enabling the UE to stop monitoring after the expected duration without continuously monitoring the entire discovery reference signal window, thus reducing power consumption while maintaining detection reliability.
2Measurement precision
If the UE continuously monitors the discovery reference signal window, then the completeness of SSB measurement is improved, but the measurement time increases
Solution Approach 1:
The control channel transmission provides advance information about the maximum SSB burst length and channel occupancy time before the SSBs are transmitted. This allows the UE to calculate the exact measurement duration needed and stop monitoring after that period, avoiding unnecessary continuous monitoring and reducing time loss while ensuring complete SSB measurement.
Solution Approach 2:
The system dynamically adjusts the measurement duration based on the control channel transmission content. The UE modifies its monitoring behavior from a fixed continuous approach to a variable duration approach, stopping measurements after the expected SSB burst length or channel occupancy time, whichever is shorter, thereby optimizing measurement time while maintaining completeness.
3Productivity
If the base station transmits SSBs as early as possible after channel access, then the productivity of spectrum utilization is improved, but the flexibility of SSB delivery is reduced
Solution Approach 1:
The base station transmits the control channel transmission (COT-SI) before the SSBs to indicate the maximum SSB burst length and channel occupancy time. This preliminary action enables the UE to flexibly adjust its measurement timing and duration, allowing the base station to transmit SSBs as early as possible after channel access while maintaining flexibility in SSB delivery through configurable parameters.
Data Source
AI summary
A base station may transmit a control channel transmission during a configured discovery reference signal window on a shared spectrum. A user equipment (UE) may detect the control channel transmission from the base station during the configured discovery reference signal window on the shared spectrum. The UE may determine, in response to detecting the control channel transmission, expected synchronization signal block (SSB) positions within a maximum SSB burst length starting from the control channel transmission during the discovery reference signal window. The base station may transmit SSBs at the expected SSB positions within the maximum SSB burst length starting from the control channel transmission during the discovery reference signal window. The UE may measure SSBs at the expected SSB positions. The UE may conserve power by stopping measurements or entering a sleep mode after the expected SSB positions.