Uplink Grant Mechanism for Idle State Data Transmission
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Solution Overview
Problem
In machine to machine (M2M) communication systems, user equipment (UE) experiences high power consumption when transitioning from an idle state to a connected state for data transmission, especially in scenarios where data is sent infrequently.
Innovation Solution
The proposed solution involves a data transmission method where the base station sends an uplink grant to the UE in an idle or inactive state, allowing the UE to send uplink data without entering a connected state, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE enters RRC_CONNECTED state to send data, then data transmission can be performed, but power consumption increases due to continuous monitoring requirements
Solution Approach 1:
The patent segments the traditional RRC connection establishment process by introducing a new data transmission mechanism that operates independently of full RRC connection establishment. The uplink grant mechanism is segmented from the connection setup procedure, allowing data transmission without completing the full connection establishment, thus reducing power consumption while maintaining transmission capability.
Solution Approach 2:
The base station performs preliminary action by pre-configuring uplink grants for the UE in idle or inactive states. This allows the UE to transmit data immediately when needed without entering connected state, as the uplink resources are already allocated in advance. This preliminary resource allocation resolves the contradiction by enabling transmission capability without the power cost of continuous monitoring.
2Productivity
If the UE remains in RRC_CONNECTED state to send data, then data can be transmitted efficiently, but unnecessary power consumption occurs due to continuous monitoring
Solution Approach 1:
The patent extracts the data transmission function from the RRC connected state requirement. By introducing a separate uplink grant-based transmission mechanism that operates from idle or inactive states, it separates the essential data transmission capability from the power-intensive connected state maintenance, allowing efficient transmission without unnecessary power consumption.
Solution Approach 2:
The patent introduces dynamic state management where the UE can flexibly transmit data from different states (idle, inactive, or connected) depending on the uplink grant availability and data urgency. This dynamic approach optimizes the balance between transmission efficiency and power consumption by avoiding forced transitions to connected state when not necessary.
3Productivity
If the UE transitions to RRC_CONNECTED state for data transmission, then uplink data can be sent, but transmission delay increases due to state transition requirements
Solution Approach 1:
The base station performs preliminary resource allocation by configuring uplink grants in advance for UEs in idle or inactive states. This preliminary action eliminates the need for time-consuming state transitions and random access procedures, as UEs can immediately transmit data using pre-configured resources, thus reducing transmission delay while maintaining transmission capability.
Solution Approach 2:
The patent allows UEs to skip the traditional RRC connection establishment process and random access procedure by directly transmitting data using uplink grants received in idle or inactive states. This skipping of intermediate steps rushes through the data transmission process, eliminating unnecessary delays associated with state transitions.
Data Source
AI summary
Disclosed are a data transmission method and apparatus, a search space optimization method and apparatus and a storage medium. The data transmission method includes that a UE sends a random access preamble to a base station and receives a random access response sent by the base station, the UE sends a first request message to the base station, and the UE in a first state receives an uplink grant sent by the base station and sends uplink data to the base station by using the uplink grant, where the first state includes an idle state or an inactive state. The UE can transmit uplink data without entering a connected state so that power consumption of the UE is reduced.