Paging DCI Scheduling for Small Downlink Data
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Solution Overview
Problem
In communication scenarios like machine type communication (MTC) and narrowband Internet of Things (NB-IoT), the existing RRC connection establishment procedure for downlink data transmission results in high radio resource utilization and increased transmission delay due to the exchange of multiple signaling pieces, especially for small data packets with uncertain arrival times.
Innovation Solution
A paging DCI-based downlink data transmission method that allows for immediate transmission of small data packets without establishing an RRC connection, utilizing downlink control information (DCI) to schedule and indicate the time-frequency location of the data, reducing signaling overhead and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC connection establishment procedure is performed for downlink data transmission, then reliable data transmission is ensured, but signaling overhead increases and transmission delay increases
Solution Approach 1:
The terminal device performs measurements and prepares data transmission in advance during the idle state, before the RRC connection is formally established. The terminal measures reference signals, determines channel quality, and prepares uplink data, so that when the network initiates paging and connection establishment begins, the terminal can immediately transmit data without waiting for connection setup, thereby reducing transmission delay while maintaining reliability
Solution Approach 2:
The patent allows the terminal to skip the traditional sequential waiting process where it must wait for RRC connection establishment before transmitting data. Instead, the terminal rushes through the process by performing measurements and preparing data in parallel during the idle state, and can immediately transmit upon receiving paging, effectively skipping the delay inherent in traditional sequential connection establishment
2Reliability
If RRC connection establishment procedure is performed for downlink data transmission, then data transmission reliability is ensured, but radio resource utilization decreases
Solution Approach 1:
The terminal performs channel measurements and data preparation in advance during the idle state, before RRC connection establishment is triggered. This preliminary action ensures that when connection establishment occurs, the terminal can immediately transmit data with proper channel quality information, eliminating the need for additional measurement signaling during connection setup, thereby improving radio resource utilization while maintaining transmission reliability
Solution Approach 2:
The patent extracts the measurement and data preparation functions from the RRC connection establishment procedure itself and performs them separately in advance during the idle state. This separation allows the connection establishment to focus only on the essential signaling exchange, reducing the signaling overhead and radio resource consumption associated with traditional connection establishment while ensuring data transmission reliability
3Reliability
If terminal monitors paging message and establishes RRC connection, then downlink data can be transmitted, but power consumption increases
Solution Approach 1:
The terminal performs channel measurements and prepares data in advance during the idle state, before being paged. This preliminary preparation means that when the terminal receives the paging message and establishes RRC connection, it can immediately transmit data without additional measurement and preparation steps, reducing the total time the terminal needs to remain active and thus reducing power consumption while ensuring data transmission capability
Solution Approach 2:
The terminal skips the traditional process of waiting for connection establishment before transmitting data. By performing measurements and preparations in advance and immediately transmitting upon receiving paging, the terminal reduces the duration of high-power states (active reception and transmission), thereby reducing overall power consumption while maintaining the ability to reliably transmit downlink data
Data Source
Figure 1~2B
Figure 3A~3B
Figure 3C
AI summary
A data transmission method and an apparatus are provided. The method includes: An access network device sends DCI for a paging message to a terminal device, where the DCI further includes scheduling information for downlink data. The access network device further sends the paging message to the terminal device, where the paging message includes first indication information, and the first indication information indicates that first downlink data corresponds to the terminal device. Therefore, when determining, based on the paging message, that there is downlink data to arrive, the terminal device determines a time-frequency location of the downlink data based on the scheduling information that is for the downlink data and that is in the DCI, and then receives the downlink data at the time-frequency location. According to the method and the apparatus provided in this application, a small amount of downlink data is transmitted, resource utilization is improved, and power consumption of the terminal device is reduced.