Uplink Data Transmission in Idle State for 5G IoT Terminals
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Solution Overview
Problem
In 5G communication scenarios, particularly for IoT and NB-IoT terminals, there is a challenge in reducing data transmission latency due to the high signaling consumption during network connection establishment, leading to increased latency and power consumption.
Innovation Solution
A data transmission method where a terminal sends uplink data in an idle or inactive state using preconfigured uplink grants, with indication information to manage state transitions and reduce air interface interactions, allowing for timely transmission of remaining data without entering a connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal establishes a network connection to send data, then the data transmission reliability is improved, but the signaling consumption and transmission latency increase
Solution Approach 1:
The terminal performs data transmission in the idle state before formally establishing a network connection. The network device allocates uplink resources in advance, allowing the terminal to send data immediately without waiting for connection establishment, thus reducing latency while maintaining transmission reliability through pre-configured resources
Solution Approach 2:
The data transmission process is segmented into two phases: Phase 1 allows data transmission in the idle state using pre-allocated resources for urgent or small data, and Phase 2 handles connection establishment for subsequent data. This segmentation allows critical data to be transmitted immediately while connection setup proceeds separately
2Reliability
If the terminal establishes a network connection to send data, then the data transmission reliability is improved, but the signaling consumption increases
Solution Approach 1:
The network device performs preliminary resource allocation in the idle state, assigning uplink grants and configuration parameters before the terminal needs to send data. This preliminary action eliminates the need for extensive signaling during connection establishment, as resources are already prepared and can be activated immediately
Solution Approach 2:
The patent extracts the resource allocation function from the connection establishment process. Instead of allocating resources only after connection is established, the network device extracts and performs resource allocation in advance during the idle state, separating this function from the traditional connection setup sequence and reducing overall signaling
3Reliability
If the terminal sends data after entering connected state, then the data transmission reliability is improved, but the power consumption increases
Solution Approach 1:
The terminal receives and stores uplink resource configurations in advance while in the low-power idle state. When data needs to be transmitted, the terminal can immediately use the pre-configured resources without transitioning to the high-power connected state, thus maintaining transmission reliability while minimizing power consumption by staying in the idle state
4Speed
If the terminal reduces air interface interactions to lower latency, then the transmission speed is improved, but the state management complexity increases
Solution Approach 1:
The idle state is given multi-functionality: it serves both as a low-power standby state and as an active data transmission state. By enabling uplink resource allocation and data transmission capabilities in the idle state, the terminal can handle certain data transmission tasks without transitioning states, reducing latency while the network device manages the complexity of dual-state operation
Data Source
AI summary
This application provides a data transmission method and apparatus. A terminal: receives a first uplink grant from a network device; sends first uplink data in to-be-sent data to the network device by using the first uplink grant; receives a second uplink grant from the network device; and sends second uplink data to the network device by using the second uplink grant, where the second uplink data is at least a part of uplink data in the to-be-sent data except the first uplink data, where the terminal is in a first state, and where the first state includes an idle state or an inactive state. The embodiments of this application help reduce a latency in a data transmission process.