Grant-Free Data Transmission Scrambling for Device Identification
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Solution Overview
Problem
In massive machine type communications and ultra-reliable low latency communications, the grant-free transmission mechanism faces challenges in identifying terminal devices due to high detection complexity and a high probability of data reception errors or false alarms, especially when multiple devices access the network, leading to collisions and incorrect data identification by the base station.
Innovation Solution
The proposed solution involves a data transmission method where a terminal device scrambles data using a first identifier after CRC check and channel coding, and then scrambles the coded data using a second identifier, allowing the receiving device to descramble and identify the correct terminal device without needing to perform descrambling on all devices using the same time-frequency resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station performs CRC check on all terminal devices using the same time-frequency resource to determine the transmitting terminal device, then the terminal device identification can be achieved, but the detection complexity increases and the probability of data reception error or false alarm increases
Solution Approach 1:
The patent segments the identification process by dividing terminal devices into different groups, where each group uses a specific scrambling code for CRC checks. This allows the base station to perform CRC verification only within the relevant group rather than checking all terminal devices, thereby reducing detection complexity while maintaining identification accuracy.
Solution Approach 2:
The patent introduces scrambling codes as an intermediary mechanism to facilitate terminal device identification. By using group-specific scrambling codes applied to CRC checks, the system enables the base station to efficiently identify transmitting terminals without having to perform exhaustive checks on all devices, thus reducing complexity while preserving accuracy.
2Measurement precision
If the base station performs CRC check on all terminal devices using the same time-frequency resource, then the terminal device can be identified, but the probability of data reception error or false alarm increases
Solution Approach 1:
The patent segments terminal devices into distinct groups with unique scrambling codes. This segmentation ensures that CRC checks are performed only on relevant devices within each group, reducing the probability of false alarms caused by checking unrelated devices while maintaining accurate identification of the transmitting terminal.
Solution Approach 2:
The scrambling code acts as an intermediary that links the terminal device to its group identity. By applying the group-specific scrambling code to the CRC check, the system enables reliable identification of the transmitting terminal while minimizing false alarms, thus improving data reception reliability without sacrificing identification accuracy.
3Measurement precision
If a long sequence identifier (e.g., 16 bits) is used as identity information for CRC check, then terminal device identification can be performed, but the base station easily determines incorrectly received data as correct data of another terminal device
Solution Approach 1:
The patent segments the identifier space by assigning group-specific scrambling codes to different terminal device groups. This segmentation allows the use of shorter effective identifier sequences within each group while maintaining unique identification capability, thereby reducing the likelihood of incorrectly received data being misidentified as valid data from another terminal.
Solution Approach 2:
The scrambling code serves as an intermediary that binds the terminal device identifier to its group context. By applying the group-specific scrambling code to the CRC check, the system ensures that even with shorter identifier sequences, the base station can accurately identify the transmitting terminal without falsely accepting incorrectly received data, thus improving data reception accuracy while maintaining identification capability.
Data Source
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AI summary
Embodiments of this application provide a data transmission method and apparatus and a storage medium. The method includes: After obtaining a first identifier and a second identifier that uniquely identify a first device, the first device scrambles, by using the first identifier, checked data obtained through CRC check. After performing channel coding on to-be-transmitted data and scrambled checked data, the first device scrambles, by using the second identifier, coded data obtained through channel coding, and finally sends scrambled data. In this way, after receiving the scrambled data, a second device may perform descrambling by using the second identifier, and then perform CRC check, to determine whether the received data is correct and determine the first identifier of the first device. The second device does not need to perform descrambling on all first devices that use a same time-frequency resource, thereby reducing detection complexity, and reducing a probability of a data reception error or a false alarm