Terminal Device Idle Mode Data Reception via PDCCH
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Solution Overview
Problem
In Universal Mobile Telecommunications Systems (UMTS), user equipment (UE) in idle mode experiences low system efficiency and high power consumption due to the need to switch to connected mode for data transmission, requiring a Radio Resource Control (RRC) connection.
Innovation Solution
A method where a set of access network devices send Physical Downlink Control Channel (PDCCH) carrying scheduling information to a terminal device without establishing a high-layer signaling connection, allowing the terminal device to receive downlink data directly, reducing power consumption and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device switches to connected mode to receive data, then data transmission can be performed, but power consumption increases and system efficiency decreases
Solution Approach 1:
The patent segments the connection establishment process by allowing the terminal device to remain in idle mode while receiving downlink data through PDCCH monitoring. The control plane connection is maintained for signaling, while the user plane data transmission occurs without establishing a full RRC connected state, thus separating the need for data reception from the need for complete connection establishment.
Solution Approach 2:
The network side performs preliminary actions by pre-configuring the terminal device with downlink data and PDCCH resources while the terminal is in idle mode. The data is prepared and scheduled in advance, allowing the terminal to receive data without transitioning to connected mode, thereby avoiding the overhead and power consumption associated with connection establishment.
2Productivity
If the terminal device switches to connected mode for data transmission, then data can be received, but the process becomes complex and time-consuming
Solution Approach 1:
The patent divides the communication protocol into separate control plane and user plane functions. The control plane maintains minimal signaling connections for device management, while the user plane enables data transmission through idle mode mechanisms, reducing the complexity of full connection establishment while maintaining data transmission capability.
3Productivity
If the terminal device switches to connected mode, then data transmission is enabled, but the switching process causes delays
Solution Approach 1:
The network side performs preliminary actions by pre-configuring the terminal device with downlink data and PDCCH resources while the terminal is in idle mode. The data is prepared and scheduled in advance, allowing the terminal to receive data without transitioning to connected mode, thereby eliminating mode switching delays.
Data Source
AI summary
Provided in the embodiments of the present application are a method for transmitting data, an access network device, a terminal device, and a network entity. The method comprises: a first access network device sends a physical downlink control channel to a terminal device, the physical downlink control channel comprising scheduling information of downlink data of the terminal device, the first access network device being any network access device in a first access network device set, the access network set comprising at least one access network device, the terminal device being able to move without switching within the range covered by the at least one access network device; and the first access network device sends the downlink data to the terminal device. In the embodiments of the present application, the terminal device is capable of receiving downlink data without recovering a high-level signalling connection, thereby improving system efficiency and reducing the power consumption of the terminal device.