Dynamic QCL Reporting State Management for 5G UE Power Optimization
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Solution Overview
Problem
In 5G wireless communication systems, particularly in frequency range 4 (FR4), the frequent changes in quasi co-location (QCL) relationships due to shorter slot durations lead to increased overhead in communications, as user equipment (UE) needs to frequently report changes in QCL relationships, which can be burdensome and result in high thermal overheads and power consumption.
Innovation Solution
The system allows a base station to dynamically control and restrict QCL reporting by changing the QCL reporting state for the user equipment (UE) from an active to a restricted state, reducing the need for frequent reporting by eliminating or reducing the reference signals associated with QCL Type A, B, or C, and signaling to the UE which reference signals are eliminated, thereby reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent QCL reporting is performed to maintain accurate channel state information, then communication reliability is improved, but overhead and power consumption increase
Solution Approach 1:
The patent implements dynamic QCL reporting by introducing a QCL reporting state that can switch between active and restricted modes. The base station determines whether to change the QCL reporting state based on current channel conditions and communication requirements, allowing the system to adaptively adjust reporting frequency rather than using a fixed reporting schedule. This dynamic approach maintains reliability when needed while reducing power consumption during stable conditions.
Solution Approach 2:
The patent changes the parameter of QCL reporting frequency by introducing a state-based control mechanism. The base station generates indications to switch the UE between active QCL reporting state (frequent reporting) and restricted QCL reporting state (reduced reporting). This parameter change allows the system to optimize the balance between communication reliability and power consumption based on actual channel variability and service requirements.
2Reliability
If frequent QCL reporting is performed to maintain accurate channel state information, then communication reliability is improved, but system overhead increases
Solution Approach 1:
The patent implements dynamic QCL reporting by introducing a QCL reporting state that can switch between active and restricted modes. The base station determines whether to change the QCL reporting state based on current channel conditions and communication requirements, allowing the system to adaptively adjust reporting frequency rather than using a fixed reporting schedule. This dynamic approach maintains reliability when needed while reducing overhead during stable conditions.
Solution Approach 2:
The patent changes the parameter of QCL reporting frequency by introducing a state-based control mechanism. The base station generates indications to switch the UE between active QCL reporting state (frequent reporting) and restricted QCL reporting state (reduced reporting). This parameter change allows the system to optimize the balance between communication reliability and overhead based on actual channel variability and service requirements.
3Use of energy by moving object
If QCL reporting is restricted to reduce overhead, then power consumption is reduced, but channel state information accuracy may deteriorate
Solution Approach 1:
The patent implements a feedback-based QCL reporting control mechanism where the base station monitors channel conditions and communication status, then generates indications to switch the UE between active and restricted QCL reporting states. This feedback loop ensures that QCL reporting is maintained at appropriate levels to preserve channel state information accuracy while minimizing unnecessary reporting that would increase power consumption. The base station can reactivate full reporting when channel conditions change significantly.
Data Source
AI summary
Techniques for dynamic downlink and uplink quasi co-location (QCL) relationship reporting are disclosed. In an example, a base station may determine to change a QCL reporting state for a user equipment (UE), wherein the QCL reporting state is one of an active QCL reporting state or a restricted QCL reporting state. The base station may also generate an indication to indicate the change in the QCL reporting state to the UE in response to the determining the change in the QCL reporting state. The base station may also transmit, to the UE, the indication in response to the generating the indication.