Dynamic CSI Triggering via Downlink Control Information
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Solution Overview
Problem
In Long Term Evolution (LTE) systems, there is a challenge in effectively triggering terminal devices to report channel state information (CSI) to network devices, leading to inefficiencies in communication and increased signaling overhead.
Innovation Solution
The method involves the network device transmitting downlink control information to terminal devices, which includes indicators for determining whether to report CSI, allowing each device to decide based on received information, thereby reducing unnecessary reporting and optimizing signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices continuously report channel state information, then the network device can maintain accurate channel knowledge, but signaling overhead increases and communication efficiency decreases
Solution Approach 1:
The patent implements dynamic CSI reporting by introducing a trigger mechanism that adapts reporting behavior to current channel conditions and network requirements. The network device sends trigger indications to terminal devices, which dynamically activate or deactivate CSI reporting based on real-time needs, rather than using continuous periodic reporting. This dynamic approach maintains necessary channel state accuracy while significantly reducing unnecessary signaling overhead during stable channel conditions.
Solution Approach 2:
The patent changes the reporting parameter from fixed periodic intervals to event-driven triggering. By modifying the reporting mechanism to respond to specific events (trigger indications from network, channel quality thresholds, scheduling decisions), the system optimizes the balance between maintaining accurate channel knowledge and minimizing signaling overhead. The reporting frequency and activation status become variable parameters controlled by network conditions rather than fixed constants.
2Productivity
If terminal devices report channel state information frequently, then the network can optimize resource allocation, but communication efficiency is reduced due to increased reporting overhead
Solution Approach 1:
The patent implements dynamic CSI reporting by introducing a trigger mechanism that adapts reporting behavior to current channel conditions and network requirements. The network device sends trigger indications to terminal devices, which dynamically activate or deactivate CSI reporting based on real-time needs, rather than using continuous periodic reporting. This dynamic approach maintains necessary channel state accuracy while significantly reducing unnecessary signaling overhead during stable channel conditions.
Solution Approach 2:
The terminal device autonomously determines whether to report CSI based on received trigger indications and local channel assessments, without requiring continuous network coordination for each reporting decision. This self-service mechanism allows the terminal to independently optimize reporting behavior, reducing network signaling overhead while maintaining adequate channel state information for resource allocation decisions.
3Loss of information
If the network device requests CSI reporting from all terminal devices, then complete channel state information is obtained, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by enabling selective CSI reporting based on individual terminal device conditions and network needs. Instead of uniformly requesting CSI from all terminals, the network sends targeted trigger indications to specific terminals that require channel state information. Each terminal's reporting behavior is locally optimized based on its own channel conditions, traffic pattern, and the network's specific information needs, reducing overall signaling complexity while maintaining necessary information completeness.
Solution Approach 2:
The patent segments the CSI reporting process by dividing terminal devices into different reporting groups or categories based on their channel conditions, service requirements, and network priority. The network can send trigger indications to specific segments or groups of terminals rather than broadcasting to all devices. This segmentation reduces the number of devices that need to process trigger indications and prepare reports simultaneously, lowering overall signaling processing complexity.
Data Source
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AI summary
Embodiments of the present invention provide a method and an apparatus for transmitting channel state information. The method includes: receiving, by a first terminal device, downlink control information DCI transmitted by a network device; determining, by the first terminal device, according to the DCI, whether it is necessary to report CSI; and when the first terminal device determines that it is necessary to report the CSI, transmitting, by the first terminal device, the CSI of the first terminal device to the network device. The first terminal device may be triggered to report the CSI according to the DCI transmitted by the network device, and thus the terminal device may report its own CSI.