Uplink Resource Sizing for Random Access Data Transmission
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Solution Overview
Problem
In mobile communication systems, when a terminal switches between contention-based and contention-free random access processes, the size of the uplink transmission resource authorized in the msg2 message often does not match the size of the to-be-transmitted uplink data, leading to transmission failures.
Innovation Solution
A method and apparatus that enable a terminal to transmit a first preamble to a base station, receive a random access response (RAR) message, and obtain an uplink transmission resource, ensuring the size of the resource supports the transmission of the uplink data by checking and adjusting the data buffer, assembling or deleting data as necessary to match the resource size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal switches between contention-based and contention-free random access processes, then the random access process can adapt to different scenarios, but the size of the uplink transmission resource authorized in msg2 cannot match the size of to-be-transmitted uplink data
Solution Approach 1:
The patent makes the uplink transmission resource size dynamic by allowing the terminal to request a different resource size than initially authorized. The terminal can adjust the resource size based on the actual data buffer size, transforming the static resource allocation into a dynamic adaptation process that resolves the mismatch between authorized resource size and actual data size.
Solution Approach 2:
The patent changes the parameter of uplink resource size from a fixed authorized value to an adjustable value. By introducing a resource size indication mechanism where the terminal can request resource size > 0 even when initially authorized with resource size = 0, the system enables parameter transformation to match actual transmission needs.
2Device complexity
If the uplink transmission resource size is fixed based on initial authorization, then the resource allocation is simple, but the transmission fails when resource size does not match data size
Solution Approach 1:
The patent applies preliminary action by having the terminal check its data buffer size before transmission and proactively request appropriate resource size adjustment. This preliminary check and request mechanism prevents transmission failures by ensuring resource size matches data size before the actual transmission occurs.
3Manufacturing precision
If the terminal requests uplink transmission resource with size > 0 when initially authorized with size = 0, then the resource size can match data size, but this is contrary to conventional random access procedures
Solution Approach 1:
The patent inverts the conventional approach by allowing the terminal to request resource size > 0 even when initially authorized with resource size = 0. This inversion of the traditional resource allocation logic enables the terminal to override the initial authorization and request appropriate resources based on actual data needs, resolving the size mismatch problem.
Data Source
AI summary
The embodiments of the present disclosure provide a data transmission method and apparatus, and a terminal. The method includes a terminal sending a first preamble to a base station and receiving a first random access response message sent by the base station. The method further includes the terminal acquiring an uplink transmission resource based on the first random access response message and transmitting first uplink data on the uplink transmission resource. The size of the uplink transmission resource supports the transmission of the first uplink data.