Semi-Persistent SRS Resource Sets for Low-Latency DCI Activation
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Solution Overview
Problem
Existing wireless communication systems face high latency and inefficiencies in activating and deactivating semi-persistent sounding reference signal (SRS) resource sets due to mechanisms like MAC-CE transmission, which are inflexible and unable to support dynamic updates, hindering performance in scenarios with rapidly changing channel conditions or interference.
Innovation Solution
Implementing downlink control information (DCI) based mechanisms for activating and deactivating semi-persistent SRS resource sets, allowing for lower latency and dynamic control through RRC signaling and DCI messages, with a mapping between DCI codepoints and SRS resource sets to facilitate flexible parameter updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MAC-CE transmission is used for activating and deactivating semi-persistent SRS resource sets, then the system maintains simplicity in the activation mechanism, but the latency increases and the system loses flexibility in dynamically adapting to changing channel conditions
Solution Approach 1:
The patent introduces a dynamic activation mechanism where the network can switch between MAC-CE and DCI-based activation methods. The configuration includes a first set of SRS resource sets activated by MAC-CE and a second set activated by DCI, allowing the system to adapt the activation method based on channel conditions and latency requirements
Solution Approach 2:
The patent changes the activation parameter from static MAC-CE to dynamic DCI-based activation. The DCI format includes an SRS request field that can trigger activation, and the system supports dynamic updates of SRS resource set parameters through DCI messages, enabling faster response to changing conditions
2Ease of operation
If MAC-CE transmission is used for activating and deactivating semi-persistent SRS resource sets, then the system maintains a straightforward activation approach, but the adaptability to rapidly changing channel conditions deteriorates
Solution Approach 1:
The patent enables dynamic adaptation by allowing the network to select between MAC-CE and DCI activation methods based on channel conditions. The second set of SRS resource sets can be activated by DCI, which provides faster and more flexible response to changing channel conditions compared to MAC-CE
Solution Approach 2:
The patent creates a universal activation framework that supports both MAC-CE and DCI-based activation methods. The system can configure different SRS resource sets with different activation methods, providing versatility in handling various channel conditions and traffic patterns
3Ease of operation
If MAC-CE transmission is used for activating and deactivating semi-persistent SRS resource sets, then the system maintains a simple activation mechanism, but the support for dynamic parameter updates deteriorates
Solution Approach 1:
The patent enables dynamic parameter updates through DCI-based activation. The DCI messages can carry updated parameters for SRS resource sets, allowing the network to dynamically adjust SRS transmission parameters without requiring new MAC-CE transmissions or RRC reconfiguration
Solution Approach 2:
The patent introduces dynamic parameter update capability by allowing the network to send DCI messages that update SRS resource set parameters in real-time. This enables the system to adapt SRS transmission characteristics dynamically based on current channel conditions and traffic requirements
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some aspects, a user equipment (UE) and a network entity may support one or more signaling- or configuration-based mechanisms according to which the UE and the network entity may dynamically control a type of semi-persistent SRS resource set associated with activation and deactivation by downlink control information (DCI). The network entity may transmit an indication of a set of semi-persistent SRS resource sets associated with DCI activation to the UE via radio resource control (RRC) signaling and may activate one or more semi-persistent SRS resource sets from the set of semi-persistent SRS resource sets via a DCI message. To facilitate activation by DCI, the UE and the network entity may support a mapping between a set of DCI codepoints and multiple sets of one or more semi-persistent SRS resource sets.