Downlink-Triggered Random Access for IoT Power Reduction
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Solution Overview
Problem
The existing Early Data Transmission (EDT) technique in Machine Type Communication (MTC) and Narrow Band Internet of Things (NB-IoT) protocols results in high power consumption for user equipment (UE) due to the need for frequent random access procedures, which are not supported for multiple data packets sent at intervals and require sending Msg1 and receiving Msg2 for each data packet.
Innovation Solution
A method where a base station sends first information over a downlink channel to trigger a random access procedure, allowing the terminal to initiate a contention-based or non-contention-based random access process, and includes Msg4 in the random access process to support EDT, enabling efficient data transmission without constant RRC state changes, thus reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If EDT technique is used for data transmission in MTC and NB-IoT, then data transmission efficiency is improved, but power consumption of UE increases
Solution Approach 1:
The patent dynamically adjusts the random access procedure based on data packet characteristics. For multiple data packets sent at intervals, the system transitions from frequent random access (Msg1/Msg2) to a more efficient procedure utilizing downlink-triggered random access and Msg4, adapting the communication protocol to match the actual data transmission pattern and reduce unnecessary signaling
Solution Approach 2:
The patent changes the parameter of random access triggering mechanism from UE-initiated (Msg1) to downlink-information-triggered (Msg4). By modifying how random access is initiated and what messages are used, the system achieves efficient data transmission while reducing the power consumption associated with frequent Msg1/Msg2 exchanges
2Productivity
If frequent random access procedures are performed for multiple data packets, then data transmission is enabled, but complexity of access procedure increases
Solution Approach 1:
The patent makes Msg4 serve multiple functions: it acts as both a random access response and a data transmission carrier. This multi-functionality allows the system to handle multiple data packets efficiently without requiring separate random access procedures for each packet, thereby reducing procedural complexity while maintaining data transmission capability
Data Source
AI summary
Provided are a method and device for sending information, and a method and device for receiving information. The method includes: a base station sends first information to a terminal over a downlink channel, wherein the first information include one of the following: information for triggering a random access procedure, and Msg4 in a random access process.