CA SRS Resource Configuration for NR Inactive State Transmission
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Solution Overview
Problem
In the NR system, carrier aggregation sounding reference signals (SRS) cannot be configured or transmitted in an inactive state due to the absence of a connected state configuration procedure when the terminal device is camped on a single cell.
Innovation Solution
A method and apparatus for configuring carrier aggregation SRS resources in an inactive state by reporting terminal device capabilities to a network device, which then provides configuration information for resource allocation, including carrier frequencies and resources for SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device is in an inactive state with single cell camping, then the device can maintain low power consumption and simple state management, but carrier aggregation SRS cannot be configured or transmitted
Solution Approach 1:
The network device performs configuration preparation in advance by including SRS resource configuration information in the RRC release message before the terminal enters inactive state. This preliminary configuration enables the terminal to transmit CA SRS in inactive state without requiring connected state configuration procedures, thus resolving the contradiction between maintaining inactive state simplicity and enabling SRS transmission capability.
2Adaptability or versatility
If CA SRS configuration procedure is performed in connected state, then SRS transmission can be configured, but the terminal cannot transmit CA SRS in inactive state due to absence of configuration procedure
Solution Approach 1:
The RRC release message is enhanced to serve dual purposes: it both releases the RRC connection and provides SRS resource configuration information for inactive state. This multi-functionality allows the same message to handle both connection release and SRS configuration, eliminating the need for separate configuration procedures in different states and enabling state-flexible SRS transmission.
3Reliability
If configuration information is added for CA SRS in inactive state, then SRS transmission is enabled, but signaling overhead increases
Solution Approach 1:
The SRS resource configuration information is merged into the existing RRC release message rather than being transmitted as separate signaling. This combination approach enables CA SRS configuration in inactive state while minimizing additional signaling overhead, as the configuration is carried within an already-necessary message for state transition.
Data Source
AI summary
A reference signal resource configuration method and a related apparatus. The method includes: reporting capability information of a terminal device to a network device, where the capability information includes a capability of the terminal device to transmit a carrier aggregation (CA) SRS in an inactive state; and receiving configuration information sent by the network device, where the configuration information is used to configure a resource for the terminal device to transmit the CA SRS in the inactive state, and the configuration information is determined based on the capability information. According to solutions provided in this embodiment, resource configuration for the CA SRS in the inactive state is implemented.