QCL Indication for Dormant SCell Carrier Quality Measurement
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Solution Overview
Problem
Wireless communication systems face challenges in indicating quasi co-location (QCL) relationships between dormant and deactivated carriers, leading to increased power consumption and costs due to the inability to efficiently manage secondary cell (SCell) deactivation and dormancy.
Innovation Solution
A framework is introduced to configure user equipment (UE) with QCL relationships between an anchor cell and SCell using carrier indications, enabling efficient quality determination of dormant or deactivated SCells by transmitting reference signals through the anchor carrier, reducing signaling overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted using dormant or deactivated SCell carriers, then quality determination of SCells can be performed directly, but power consumption and operational costs increase
Solution Approach 1:
The patent introduces an anchor carrier as an intermediary to transmit reference signals that represent the quality of dormant or deactivated SCell carriers. Instead of transmitting reference signals on each dormant SCell carrier individually, the network entity transmits a single reference signal on the anchor carrier, and the UE uses this reference signal to determine the quality of the associated dormant SCell carriers through QCL relationships. This eliminates the need for active reference signal transmission on dormant carriers while maintaining accurate quality determination.
2Loss of time
If QCL relationships are indicated for dormant or deactivated carriers, then signaling overhead and latency are reduced, but the network entity requires an effective indication mechanism
Solution Approach 1:
The patent extends the existing QCL indication mechanism, originally designed for active carriers, to also apply to dormant and deactivated carriers. The network entity uses the same QCL indication structures (TCI states, QCL-Info) to indicate relationships between anchor carrier reference signals and both active and dormant SCell carriers. This universal approach allows the network to efficiently indicate QCL relationships for dormant carriers without creating separate complex indication mechanisms, thereby reducing latency and signaling overhead.
3Measurement precision
If multiple separate reference signals are transmitted for each SCell carrier, then quality determination is accurate, but signaling overhead increases
Solution Approach 1:
The patent merges the quality determination function for multiple dormant SCell carriers into a single reference signal transmission on the anchor carrier. By establishing QCL relationships between the anchor carrier reference signal and multiple dormant SCell carriers, the system allows the UE to determine the quality of multiple carriers simultaneously using one reference signal, thereby significantly reducing signaling overhead while maintaining measurement accuracy.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a carrier indication that identifies a first carrier and a second carrier for communication between the UE and a network entity. The UE may receive a first quasi co-location (QCL) indication using the first carrier. The first QCL indication may identify a first set of QCL information that corresponds to a reference signal received using the first carrier. The UE may receive a second QCL indication using the second carrier. The second QCL indication may identify the reference signal and may indicate that the first set of QCL information is associated with signaling received using the second carrier.