Uplink Data Transmission via NAS and Dedicated Bearer Fallback
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Solution Overview
Problem
The limited uplink coverage in Early Data Transmission (EDT) data transmission systems, which uses the Msg3 resource and Common Control Channel (CCCH) channel, often results in failure due to the occupation of resources for uplink data transmission.
Innovation Solution
The proposed solution involves a terminal that transmits uplink data through a Non-Access Stratum (NAS) message and, upon reaching a threshold of transmission failures, performs a Radio Resource Control (RRC) connection establishment procedure to establish a dedicated bearer, allowing the uplink data to be transmitted through this dedicated bearer instead, thereby avoiding resource limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If EDT data transmission uses Msg3 resource and CCCH channel, then data transmission can be performed in idle state, but uplink coverage is limited and transmission fails
Solution Approach 1:
The system dynamically switches between EDT mode (for normal conditions) and RRC connection establishment mode (for failure conditions), making the transmission mechanism adaptable to channel conditions rather than static
Solution Approach 2:
The invention changes the transmission parameters by switching from using Msg3/CCCH resources to establishing a dedicated RRC connection with dedicated resources, fundamentally altering the transmission characteristics to overcome coverage limitations
2Device complexity
If uplink data transmission uses common resources, then resource allocation is simple, but transmission fails under limited coverage
Solution Approach 1:
The invention introduces an intermediary mechanism (failure detection and fallback procedure) that mediates between simple common resource allocation and reliable dedicated resource allocation, switching between them based on transmission outcomes
3Reliability
If dedicated bearer is established through RRC connection, then uplink coverage is improved, but transmission procedure becomes more complex
Solution Approach 1:
The system performs preliminary transmission attempts using the simpler EDT mechanism before committing to the more complex RRC connection establishment, executing procedures in an optimal sequence to minimize overall complexity
Data Source
AI summary
The embodiments of the present application provide a data transmission method and apparatus, and a terminal. The method comprises: a terminal sends uplink data to a network device by means of a NAS message; if the number of times the terminal fails to send the uplink data reaches a first threshold value, the terminal executes an RRC connection establishment process, establishes a dedicated bearer by means of the RRC connection establishment process, and sends the uplink data by means of the dedicated bearer.