CA SRS Resource Configuration for NR Inactive-State Transmission
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Solution Overview
Problem
In the New Radio (NR) system, carrier aggregation (CA) sounding reference signals (SRS) cannot be configured or transmitted by a terminal device in an inactive state due to the absence of a CA SRS configuration procedure when only one camped cell is present.
Innovation Solution
A method and apparatus for configuring CA 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 associated parameters, allowing the terminal device to transmit CA SRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation SRS configuration procedure is not provided in inactive state, then device complexity is reduced, but the capability to transmit CA SRS in inactive state is lost
Solution Approach 1:
The network device pre-configures CA SRS transmission parameters including timing advance groups and sending parameters before the terminal device enters inactive state. This preliminary configuration enables the terminal device to transmit CA SRS in inactive state without requiring a complex configuration procedure during the inactive state, thus resolving the contradiction between maintaining transmission capability and reducing system complexity.
2Measurement precision
If CA SRS configuration is enabled in inactive state, then positioning capability is enhanced, but signaling overhead increases
Solution Approach 1:
The network device configures multiple timing advance groups and associated SRS sending parameters in advance while the terminal device is in connected state. This preliminary configuration stores necessary positioning parameters before inactive state entry, enabling accurate positioning measurements in inactive state without generating additional signaling overhead during the inactive period, thus resolving the contradiction between enhancing positioning capability and reducing signaling overhead.
3Manufacturing precision
If multiple timing advance groups are configured for CA SRS, then transmission accuracy is improved, but configuration complexity increases
Solution Approach 1:
The network device pre-configures multiple timing advance groups with different timing advance values and associates each group with specific SRS sending parameters before the terminal device enters inactive state. This advance configuration stores multiple timing advance configurations in the terminal device, enabling accurate uplink transmission timing adjustment for carrier aggregation SRS in inactive state without requiring complex real-time configuration procedures, thus resolving the contradiction between improving transmission accuracy and reducing configuration complexity.
Data Source
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Figure 3B~4
AI summary
This application provides 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 technical solutions provided in this application, resource configuration for the CA SRS in the inactive state is implemented.