SR BSR Triggering for Out-of-Sync 5G Terminals
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Solution Overview
Problem
In 5G systems, terminals face challenges in performing uplink data transmission when they are out of sync with the numerologies and TTI lengths used by the network, leading to difficulties in allocating appropriate resources for SR/BSR transmission.
Innovation Solution
A new SR/BSR triggering mechanism that determines the appropriate numerology and TTI length based on delay and QoS requirements, and initiates random access procedures to achieve synchronization and resource allocation, ensuring data transmission can proceed even when the terminal is out of sync.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal uses dedicated scheduling request resources (D-SR) for SR transmission, then the SR transmission is efficient and reliable, but the terminal must be in synchronized status with the network, which limits the terminal's ability to transmit SR when out of sync
Solution Approach 1:
The patent makes the random access resource capable of serving dual purposes: it can be used for both random access procedures and for SR transmission when the terminal is out of sync. This multi-functionality allows the terminal to transmit SR requests without requiring dedicated synchronized resources, thereby resolving the contradiction between SR transmission reliability and adaptability to different synchronization states.
Solution Approach 2:
The patent introduces a mapping relationship between logical channels and random access resources as an intermediary mechanism. When the terminal is out of sync, this mapping enables the terminal to select appropriate random access resources for SR transmission, bridging the gap between the terminal's unsynchronized state and the network's resource allocation system.
2Adaptability or versatility
If multiple numerologies and TTI lengths are supported in the network, then the system's adaptability to different services and scenarios is improved, but the complexity of resource allocation and synchronization management increases
Solution Approach 1:
The patent segments the resource allocation process by establishing separate mapping relationships between logical channels and random access resources for different numerologies and TTI lengths. This segmentation allows the terminal to select resources based on specific service requirements without having to manage all possible configurations simultaneously, thereby reducing the perceived complexity while maintaining support for multiple numerologies.
Solution Approach 2:
The patent utilizes parameter changes in the mapping relationship configuration to adapt to different numerologies and TTI lengths. By dynamically adjusting the mapping parameters based on the terminal's current state and service requirements, the system maintains simplicity in resource allocation while supporting diverse numerical configurations.
3Adaptability or versatility
If the terminal initiates random access procedure to obtain uplink synchronization, then the terminal can transmit data when out of sync, but the transmission delay increases compared to using pre-configured dedicated resources
Solution Approach 1:
The patent establishes the mapping relationship between logical channels and random access resources in advance, before the terminal needs to transmit data. This preliminary configuration allows the terminal to quickly determine the appropriate random access resource when out of sync, reducing the time required to initiate transmission compared to ad-hoc resource selection, thereby mitigating the delay penalty of random access.
Data Source
AI summary
An SR/BSR triggering method and device are provided by the present disclosure. The method includes triggering an SR (Scheduling Request) and/or BSR (Buffer Status Report) process, if there is uplink data transmission requirement in a bearer channel and/or logical channel of a terminal, and there is no uplink resource available to the terminal on physical resources corresponding to numerologies and/or TTI lengths available to the bearer channel and/or the logical channel.