Early Data Transmission in Random Access Procedure
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting high-speed data services due to resource shortages and increased user demands for faster data transfer rates, larger connection device capacities, low latency, and high energy efficiency.
Innovation Solution
A method for performing early data transmission (EDT) in a random access procedure, where a user equipment (UE) receives control messages from a base station to determine if a smaller transport block size (TBS) is permitted, and based on this, it transmits data with a specific repetition number, optimizing resource usage and reducing battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If early data transmission is performed using message 3 in random access procedure, then data transmission efficiency is improved, but device complexity increases due to additional TBS selection and repetition number determination
Solution Approach 1:
The base station pre-configures TBS subset information and repetition number mapping tables before EDT operation. The UE retrieves pre-determined repetition numbers from stored tables based on selected TBS values, avoiding complex real-time calculations during random access procedure
Solution Approach 2:
The patent introduces configurable TBS subset parameters (tbsSubset1, tbsSubset2) and mapping table parameters that can be adjusted by the base station. These parameters allow flexible adaptation of TBS selection and repetition number determination to different channel conditions and service requirements
2Quantity of substance
If a smaller TBS is selected for message 3 transmission, then resource usage efficiency is improved, but transmission reliability may deteriorate due to smaller transmission blocks
Solution Approach 1:
The patent applies repetition transmissions where the same message 3 data is transmitted multiple times according to the determined repetition number. These periodic repetitions increase the probability of successful reception at the base station, compensating for the reduced redundancy in smaller TBS selections
Solution Approach 2:
The base station configures multiple TBS subsets with different sizes and provides mapping relationships between TBS selections and repetition numbers. This allows dynamic adjustment of the balance between resource efficiency and transmission reliability based on channel conditions and service requirements
3Loss of time
If EDT is requested through random access procedure, then latency is reduced, but energy consumption increases due to additional signaling overhead
Solution Approach 1:
The patent combines data transmission with the random access procedure by carrying data in message 3, which is already required for random access completion. This merging eliminates the need for separate data transmission procedures, reducing both latency and the energy cost of additional signaling
Solution Approach 2:
The UE only transmits data in message 3 when EDT conditions are met and data is available. The base station only processes and responds to EDT requests when resources and configuration permit. This partial application of EDT avoids unnecessary signaling overhead when not beneficial
Data Source
AI summary
This specification provides a method for performing early data transmission in a random access procedure in a wireless communication system.More specifically, the method performed by a user equipment (UE) includes: receiving, from a base station, a control message including first information indicating whether selection for a second transport size (TBS) smaller than a first TBS for message 3 is permitted and second information for the first TBS; transmitting, to the base station, a request for the EDT by using message 1; receiving, from the base station, message 2 including a UL grant for the message 3; determining a repetition number for the message 3 based on the control message and the UL grant; and transmitting the message 3 to the base station by the repetition number.Therefore, there is an effect that battery consumption of the UE can be reduced.