Scheduling Request Configuration Signaling in 5G Random Access
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Solution Overview
Problem
In the 5G new radio (NR) system, the network device is unable to determine which scheduling request (SR) configuration a terminal device prefers to reconfigure, leading to potential service interruptions for other logical channel groups/logical channels due to the differences in SR resource configurations.
Innovation Solution
The terminal device transmits information on its SR configuration during the random access procedure, allowing the network device to identify the desired SR configuration and reconfigure resources accordingly, thereby avoiding unnecessary service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network device releases all SR resources and re-assigns new resources for the terminal device, then the terminal device can obtain new SR configuration, but unnecessary service interruption occurs for other LCGs/LCHs
Solution Approach 1:
The patent segments the SR resource management by introducing separate indication mechanisms for different LCGs/LCHs. The network device can selectively reconfigure SR resources for specific LCGs/LCHs rather than releasing all SR resources globally. This is achieved through separate BSR triggers and resource allocation for each LCG/LCH, allowing granular control that prevents unnecessary service interruptions while maintaining configuration adaptability.
Solution Approach 2:
The patent applies local quality by enabling the network device to apply different SR resource allocation strategies to different LCGs/LCHs based on their specific needs. Each LCG/LCH can have its own SR configuration parameters (periodicity, offset, resources) independently optimized and managed, allowing localized reconfiguration without affecting other logical channels.
2Adaptability or versatility
If multiple SR configurations are supported for different LCGs/LCHs, then logical channel differentiation is improved, but the network device cannot determine which SR configuration the terminal device prefers to reconfigure
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device reports buffer status and SR configuration preferences to the network device through BSR messages. The network device receives feedback about which LCGs/LCHs have data to transmit and use this information to determine the appropriate SR configuration to reconfigure. This feedback loop resolves the information loss by providing the network device with knowledge of terminal device preferences.
Solution Approach 2:
The patent applies preliminary action by having the network device pre-configure multiple SR configurations for different LCGs/LCHs before data transmission occurs. When the terminal device has data to send, the pre-configured SR resources are already available for immediate use, and the network device can quickly determine which configuration to activate based on the LCG/LCH identification in the BSR, avoiding information loss about configuration preferences.
Data Source
AI summary
A method and device for transmitting a scheduling request, the method includes: transmitting a scheduling request to a network device via a random access procedure when a maximum counter value of a scheduling request configuration is reached; information on the scheduling request configuration is transmitted to the network device during the random access procedure. Therefore, the network device can know which SR configuration that the terminal device would like to reconfigure upon reception of the RACH message; and only one or more resources corresponding to the SR configuration may be released, such that service interruption for other LCGs/LCHs may not happen.