Terminal Device Two-Level Control Channel Data Transmission
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Solution Overview
Problem
The two-level control channel structure in next-generation wireless communications systems increases the packet loss probability of downlink control information, affecting data transmission reliability and efficiency.
Innovation Solution
A data transmission method where a terminal device receives first downlink control information on a first time segment, followed by first transport block reception, and then receives additional encoding information on a later second time segment to facilitate decoding and reduce packet loss, potentially using combined decoding with retransmission information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-level control channel structure is used to carry downlink control information, then the control information can be divided into first DCI and second DCI for hierarchical transmission, but the packet loss probability of DCI increases compared to single-level control channels
Solution Approach 1:
The patent applies preliminary action by sending the second DCI (containing encoding information) in advance before the data transmission occurs. This allows the terminal device to have the encoding information ready before attempting to decode the data, reducing the impact of control channel packet loss. The second DCI is sent in a time segment before the data channel, ensuring the terminal can prepare for decoding even if control channel conditions are poor.
Solution Approach 2:
The patent introduces a time dimension separation by dividing DCI transmission into two distinct time segments: the first DCI is sent in an earlier time segment while the second DCI is sent in a later time segment. This temporal separation allows the system to mitigate the compounding effect of two-level control channels by distributing control information across different time instances, reducing the probability that both control messages are lost simultaneously.
2Measurement precision
If the terminal device waits for both first DCI and second DCI before decoding the transport block, then decoding accuracy can be improved, but the data transmission delay increases
Solution Approach 1:
The terminal device performs preliminary reception of the second DCI containing encoding information before the data transmission occurs. This preliminary action allows the terminal to have the decoding parameters ready in advance, so when the data arrives, decoding can begin immediately without waiting for additional control information, thus reducing delay while maintaining accuracy.
Solution Approach 2:
The patent implements dynamic timing where the terminal device can adaptively determine whether to wait for the second DCI based on channel conditions and timing relationships. If the second DCI is received in time, the terminal uses it for accurate decoding; if not, the terminal can still attempt decoding with available information, creating a flexible system that balances accuracy and delay based on real-time conditions.
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method. The method includes: receiving, by a terminal device, first downlink control information DCI sent by a network device on a first downlink control channel; receiving, by the terminal device on a first downlink data channel indicated by the first DCI, a first transport block sent by the network device; receiving, by the terminal device, fourth DCI sent by the network device on a fourth downlink control channel, where the fourth DCI includes first encoding information, and the first encoding information is used to indicate a first encoding mode of the first transport block; and performing, by the terminal device, decoding based on the first encoding information, to obtain the first transport block. In this way, a data packet loss probability can be reduced. In particular, for a data loss resulting from a loss of a level-2 control channel that is caused by a structure of two-level control channels, the data packet loss probability can be more effectively reduced in the embodiments of the present invention.