Random Access Data Transmission for Low-Energy M2M UEs
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Solution Overview
Problem
In machine-to-machine communication systems, user equipment (UE) experiences high energy consumption when transitioning to and maintaining an RRC_CONNECTED state for data transmission, particularly in scenarios where data packets are infrequent and spaced far apart, leading to unnecessary power consumption.
Innovation Solution
A data transmission method and apparatus that allows UE in an idle state to send a random access preamble and uplink data simultaneously, using a temporary C-RNTI, and maintains the idle state post-transmission, reducing the need for frequent state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE transitions to RRC_CONNECTED state for data transmission, then data can be sent to the base station, but energy consumption increases due to unnecessary state transitions and maintenance of connected state
Solution Approach 1:
The patent merges the random access procedure with the data transmission procedure by allowing the UE to send uplink data in the third message (Msg3) of the random access process. This combination eliminates the need for a separate RRC connection setup and data transmission phase, reducing state transitions and energy consumption while maintaining data transmission capability.
Solution Approach 2:
The patent enables the UE to prepare and send data in advance during the random access procedure itself, rather than waiting for full connection establishment. By incorporating data transmission into the random access messages, the UE performs data sending as a preliminary action before completing the full connection setup, thereby avoiding unnecessary connected state maintenance.
2Use of energy by moving object
If the UE remains in RRC_CONNECTED state for a period of time, then data transmission can continue, but energy is wasted due to maintaining connected state when data packets are infrequent
Solution Approach 1:
The patent extracts the data transmission function from the RRC connection management process. By allowing data to be transmitted independently during random access without requiring full connection establishment, the connected state maintenance is removed for infrequent data transmissions, reducing energy consumption while minimizing transition time overhead.
Solution Approach 2:
The patent applies partial action by allowing the UE to send only the necessary data packets during random access without completing the full connection setup. This partial data transmission approach avoids the excessive action of maintaining full RRC connected state for infrequent transmissions, optimizing both energy efficiency and response time.
Data Source
AI summary
Provided are a data transmission method, apparatus and computer readable storage medium. The method includes: in a case where a terminal is in a connected state, receiving, by the terminal, a physical downlink control channel command sent by a base station, acquiring an non-competitive resource allocated to the terminal by the base station from the physical downlink control channel command, initiating a random access by using a random access preamble corresponding to the non-competitive resource; and receiving, by the terminal, a random access response sent by the base station, and in response to determining that the random access response carries indication information for simultaneously sending downlink data, receiving, by the terminal, the downlink data.