Dynamic Transport Block Selection for Early Data Transmission
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Solution Overview
Problem
In conventional cellular communication systems, the fixed transport block size for early uplink data transmission during the random access procedure in NB-IoT systems is inadequate, limiting the ability to effectively perform early data transmission due to unknown data amounts.
Innovation Solution
The user equipment determines whether to carry early uplink data in the RRC connection request message based on a maximum transport block size from the system information block and selects a candidate transport block size from optional sizes corresponding to the number of resource units indicated by the random access response message, allowing for flexible data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single and fixed transport block size is indicated by the base station for early data transmission, then the transport block size is simplified and easy to manage, but it fails to meet the early data transmission requirement when the data amount is not fixed
Solution Approach 1:
The patent applies dynamics by enabling the user equipment to dynamically select transport block sizes from a set of optional sizes based on the actual data amount to be transmitted. This allows the system to adapt the transport block size in real-time according to varying data requirements, resolving the contradiction between simplified management and transmission adaptability
Solution Approach 2:
The patent changes the parameter of transport block size from a fixed value to a selectable range of values. The user equipment can choose appropriate transport block sizes from multiple optional sizes indicated by the base station, allowing parameter adjustment to match different data transmission needs while maintaining system manageability
2Device complexity
If the base station indicates a maximum transport block size, then the resource allocation is simplified, but the user equipment cannot effectively transmit variable amounts of early uplink data
Solution Approach 1:
The patent segments the transport block size into multiple optional sizes that the user equipment can select from based on its data transmission needs. This segmentation allows the system to maintain simple resource allocation through a maximum size indication while enabling efficient variable data transmission through selective use of appropriate transport block sizes from the segmented options
Solution Approach 2:
The patent introduces dynamic selection capability where the user equipment can adaptively choose from multiple optional transport block sizes based on the actual data amount. This dynamic approach resolves the contradiction by maintaining simple maximum size indication for resource allocation while enabling flexible and efficient transmission for variable data amounts
Data Source
AI summary
A method for early data transmission during a random access procedure including receiving a system information block from a base station; determining, by the user equipment, whether to carry early uplink data in an radio resource control (RRC) connection request message according to a maximum transport block size included in the system information block; and selecting a candidate transport block size from a plurality of optional transport block sizes according to the number of resource units indicated by a random access response message transmitted by the base station, and transmitting the RRC connection request message including the early uplink data to the base station with all or a part of the number of resource units according to the candidate transport block size, if the user equipment determines to carry the early uplink data in the RRC connection request message.