Early Data Transmission TBS Optimization for NB-IoT
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Solution Overview
Problem
The existing data transmission processes between user equipment (UE) and network nodes in NB-IoT and LTE-M systems are inefficient, leading to delays and increased power consumption due to the need for multiple requests and responses before data transmission can occur.
Innovation Solution
The introduction of Early Data Transmission (EDT) allows UE to include uplink data in Msg3 instead of Msg5 and downlink data in Msg4 instead of Msg6, optimizing data transmission by reducing the number of messages required. Additionally, the optimal Transport Block Size (TBS) for EDT is determined based on historical packet transmission data to minimize resource waste and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional data transmission process is used, then data transmission can occur, but transmission delay increases due to multiple requests and responses
Solution Approach 1:
The patent applies preliminary action by allowing the UE to include uplink data in Msg3 (random access message) before completing the full connection establishment process. This enables data to be transmitted in advance of the conventional timeline where data would only be sent after Msg5, thereby reducing transmission delay while minimizing the number of messages required.
Solution Approach 2:
The patent merges the random access procedure with data transmission by combining Msg3 (which normally contains only control information) with uplink data. This merging eliminates the need for separate data transmission messages, reducing the total number of messages exchanged and decreasing transmission delay.
2Use of energy by moving object
If conventional data transmission process is used, then data can be transmitted, but power consumption at UE increases
Solution Approach 1:
By enabling data transmission in Msg3 during the random access phase, the UE completes data transmission earlier in the protocol sequence. This preliminary action reduces the total time the UE radio needs to be active, thereby reducing power consumption while also reducing transmission delay.
Solution Approach 2:
The UE is empowered to autonomously determine whether to use EDT based on local conditions (data size, buffer status). This self-service capability allows the UE to optimize power consumption by selecting EDT when beneficial, without requiring additional network control messages, thereby reducing both power consumption and delay.
3Productivity
If fixed EDT-TBS is used, then configuration is simple, but resource efficiency decreases due to padding
Solution Approach 1:
The patent implements dynamic TBS selection where the network node determines the appropriate TBS based on historical packet transmission data and current network conditions. This dynamic approach allows the system to adapt TBS to actual data sizes, minimizing padding and improving resource efficiency while maintaining manageable configuration complexity through automated decision-making.
Solution Approach 2:
The system uses feedback from historical packet transmission data to continuously optimize TBS selection. The network node analyzes past transmission patterns and adjusts TBS configurations accordingly, creating a feedback loop that improves resource efficiency over time without requiring complex manual configuration.
4Productivity
If UE selects from multiple TBSs, then resource efficiency improves, but blind decoding complexity at network node increases
Solution Approach 1:
The UE autonomously selects the appropriate TBS from available options based on its data size and buffer status, without requiring the network node to decode multiple possibilities. This self-service selection eliminates blind decoding complexity at the network node while still allowing the UE to choose from multiple TBS options to optimize resource efficiency.
Data Source
AI summary
There is provided a method for improving early data transmission (EDT). The method includes transmitting first transport block size (TBS) information indicating a first set of one or more EDT TBSs. The method further includes after transmitting the first TBS information, obtaining EDT usage information and based on the obtained EDT usage information, determining whether to transmit the first TBS information or second TBS information indicating a second set of one or more EDT TBSs. The method further includes transmitting the first TBS information or the second TBS information based on the determination.