DCI Transmission Mode Indication for Flexible MIMO Switching
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Solution Overview
Problem
In LTE systems, switching between different transmission modes is inefficient due to high-layer signaling requirements and indirect determination of transmission manners based on DCI length, leading to inflexibility and inaccuracies.
Innovation Solution
A method for transmitting DCI that directly indicates the transmission manner through specific indication information, allowing network side devices and terminal devices to switch between modes more flexibly and reliably by using dedicated fields or feature codes within the DCI, enabling accurate and efficient mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-layer signaling interaction is used for switching between transmission modes, then mode switching can be achieved, but the switching time becomes relatively long and flexibility is reduced
Solution Approach 1:
The patent extracts the transmission mode indication from high-layer signaling interaction and places it directly within the DCI structure. By taking out the mode indication function from the high-layer protocol and embedding it in the physical layer DCI, the system achieves faster mode switching without requiring lengthy signaling interactions, thus reducing switching time while maintaining reliability
Solution Approach 2:
The patent prepares multiple DCI formats with different transmission mode indications in advance at the network side device. These pre-prepared DCI structures allow the network to immediately indicate mode switches to the terminal without requiring real-time negotiation or signaling interaction, thereby reducing switching time while ensuring reliable mode transition
2Ease of operation
If transmission manner is indirectly determined through DCI length, then the terminal can identify the transmission manner, but the determination accuracy is insufficient and flexibility is limited
Solution Approach 1:
The patent segments the DCI structure into distinct fields, with specific bits allocated for transmission mode indication. By dividing the DCI into identifiable segments including a dedicated mode indication field, the terminal can directly extract the transmission manner information without relying on indirect length-based inference, thereby improving determination accuracy while maintaining operational simplicity
Solution Approach 2:
The patent introduces a dedicated transmission mode indication field as an intermediary element within the DCI structure. This intermediary field explicitly carries the transmission manner information, serving as a clear mediator between the network's transmission mode selection and the terminal's determination process, thus eliminating the ambiguity of indirect length-based determination and improving accuracy
3Adaptability or versatility
If different DCI lengths are used for different transmission manners, then the terminal can perform blind detection, but the system flexibility and reliability are reduced
Solution Approach 1:
The patent creates a universal DCI structure that can indicate multiple transmission modes through a unified format with a dedicated mode indication field. Instead of requiring different DCI formats or lengths for different transmission manners, the same DCI structure serves multiple functions by encoding various transmission modes within its fields, thereby improving both flexibility and reliability of transmission mode indication
Data Source
AI summary
Embodiments of the present disclosure provide a method for transmitting Downlink Control Information (DCI), a network side device and a terminal device. The method includes that: the network side device determines a transmission manner adopted to send downlink data to the terminal device; and the network side device sends DCI to the terminal device, the DCI carrying first indication information which indicates the transmission manner adopted by the network side device to send the downlink data to the terminal device.