Grant-Free to Grant Mode Switching for Wireless Data Transmission
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Solution Overview
Problem
Grant-free transmission in wireless cellular networks faces challenges with high latency and reliability issues, particularly in scenarios with a large number of terminals sending small data packets, where pilot collisions and poor channel conditions can lead to failed data transmissions.
Innovation Solution
A method where a terminal in grant-free mode switches to grant mode by retrying data transmission after a predetermined number of failures or time thresholds, using acknowledge frames and instruction information to initiate a fallback to grant mode, thereby improving data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If grant-free transmission mode is used, then latency is reduced and transmission speed is improved, but transmission reliability deteriorates due to pilot collisions and poor channel conditions
Solution Approach 1:
The system dynamically switches between grant-free mode and grant mode based on transmission success/failure conditions. When transmission fails in grant-free mode, the terminal transitions to grant mode for retransmission, creating a dynamic adaptive mechanism that optimizes both speed and reliability
Solution Approach 2:
The system pre-configures grant-free resources for terminals before data transmission occurs. This preliminary configuration enables immediate transmission without waiting for grant allocation, reducing latency while maintaining the ability to fallback to grant mode if needed
2Loss of energy
If grant-free transmission mode is used, then network overhead is reduced, but transmission reliability deteriorates due to lack of scheduling control
Solution Approach 1:
The system dynamically adjusts resource allocation mode based on transmission outcomes. Grant-free mode is used for initial transmission to minimize overhead, while grant mode is activated for retransmissions, creating a dynamic balance between overhead reduction and reliability enhancement
Solution Approach 2:
The transmission process is segmented into two phases: initial transmission using grant-free mode for efficiency, and retransmission using grant mode for reliability. This segmentation allows each phase to optimize for its specific purpose
3Reliability
If terminal switches from grant-free mode to grant mode, then transmission reliability is improved through scheduled retransmission, but latency increases due to additional signaling overhead
Solution Approach 1:
The system uses grant-free resources for single-use initial transmissions where speed is prioritized over reliability. When reliability becomes critical (after failed transmission), the system transitions to the more robust but time-consuming grant mode, accepting the time cost only when necessary
Data Source
AI summary
A data transmission method, a terminal, and a network device are provided. In embodiments of the present disclosure, a terminal sends, in a grant-free mode, first data to a network device by using a grant-free resource, and if the terminal needs to switch from the grant-free mode to a grant mode, the terminal sends, in the grant mode, second data to the network device by using a grant resource. When the terminal initially transmits the first data in the grant-free mode, if the terminal needs to switch from the grant-free mode to the grant mode, the terminal may fall back to the grant mode and transmit data in the grant mode.