Secondary Cell Dormancy Signaling for Cross-Carrier Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing secondary cell dormancy for cross-carrier scheduling, leading to power consumption issues and reduced communication efficiency, reliability, and increased latency.
Innovation Solution
Implementing techniques for secondary cell dormancy indications through control signaling, allowing UEs to monitor and switch between active and dormant bandwidth parts based on downlink control information messages, including explicit dormancy state indications and fallback messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE monitors downlink control channel candidates on the secondary cell for cross-carrier scheduling, then scheduling flexibility and communication efficiency are improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic switching between active and dormant states for the secondary cell. The UE can transition from monitoring downlink control channel candidates (active state) to not monitoring (dormant state) based on scheduling needs. This dynamic state change allows the system to optimize between communication efficiency and power consumption by activating the secondary cell only when cross-carrier scheduling is required and deactivating it when not needed.
2Use of energy by moving object
If the UE switches between active and dormant bandwidth parts based on dormancy state indications, then power consumption is optimized, but communication reliability may be reduced
Solution Approach 1:
The patent employs preliminary action by configuring the UE with downlink control channel candidates to monitor before actually needing cross-carrier scheduling. The dormancy state indications and fallback mechanisms are pre-configured so that when the UE needs to switch from dormant to active state, the necessary control channels are already identified and configured, enabling rapid transition without compromising communication reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism through fallback downlink control information messages. When the UE is in dormant state and needs to reactivate, instead of directly monitoring all control channels, the system uses fallback messages as an intermediary layer to trigger the transition to active state. This intermediary approach ensures reliable reactivation while minimizing power consumption during dormant periods.
3Reliability
If the UE monitors for fallback downlink control information messages on the primary cell, then communication reliability is improved, but latency increases
Solution Approach 1:
The patent applies local quality by implementing differentiated monitoring strategies for different cells and states. The UE monitors fallback downlink control information messages on the primary cell with specific characteristics (local quality) tailored to the dormant state. This localized approach ensures that reliability is maintained through targeted monitoring of essential fallback messages without requiring continuous monitoring of all control channels, thereby reducing overall latency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration for bandwidth parts of a plurality of cells that include at least a primary cell and a secondary cell, where the secondary cell supports cross carrier scheduling. The UE may monitor a first set of downlink control channel candidates on the secondary cell for a downlink control information message for at least one cell of the plurality of cells. The UE may receive, on the secondary cell based at least in part on monitoring the first set of downlink control channel candidates, the downlink control information message that includes a dormancy state indication for the at least one cell of the plurality of cells. The UE may communicate on active bandwidth parts of the plurality of cells based at least in part on the dormancy state indication for the at least one cell.