Uplink Data Transmission via Broadcast Timing Advance
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Solution Overview
Problem
In the 5G network's massive machine type communication (mMTC) scenario, the increased uplink traffic and signaling overheads at base stations due to frequent random access processes among a large number of user terminals lead to significant access delays and power consumption, posing a challenge for efficient uplink data transmission.
Innovation Solution
The proposed method allows not all user terminals to perform random access, with some obtaining a timing advance (TA) value through a random access process and others from a TA message broadcast by another terminal, reducing collisions, access delay, and power consumption by optimizing the random access process based on generated random numbers and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all user terminals perform random access to obtain TA values, then uplink synchronization is achieved, but access delay and signaling overheads increase significantly
Solution Approach 1:
The patent segments the user terminals into two groups: those that perform random access to obtain TA values, and those that obtain TA values from broadcasted messages. This segmentation reduces the number of random access processes while maintaining synchronization for all terminals.
Solution Approach 2:
The patent introduces a broadcast message as an intermediary mechanism. Terminals that have obtained TA values through random access broadcast these values to other terminals, which then use the broadcasted TA values without performing random access themselves. This intermediary approach reduces overall access delay.
2Reliability
If all user terminals perform random access process, then TA values are obtained reliably, but power consumption increases significantly
Solution Approach 1:
The patent segments terminals into those that perform random access and those that rely on broadcasted TA values. This reduces the total number of random access operations, thereby reducing overall power consumption while maintaining reliable TA value acquisition for all terminals.
Solution Approach 2:
Terminals that successfully obtain TA values through random access serve other terminals by broadcasting the TA values. This self-service mechanism allows other terminals to obtain TA values without consuming additional power for random access operations.
3Productivity
If random access process is performed by all terminals, then uplink access is established, but signaling overheads increase drastically
Solution Approach 1:
The patent segments the uplink access establishment process into two paths: random access for some terminals and message broadcasting for others. This segmentation significantly reduces the total number of signaling messages required while maintaining productive uplink access establishment for all terminals.
Data Source
AI summary
The present application provides an uplink data transmission method and a user terminal (UE) for executing the method. The method in the present application comprises: A, generating a first random number; B, determining, according to the generated first random number, whether to initiate a random access process; if the random access process is initiated, obtaining a timing advance (TA) value from a base station by means of the random access process; and if the random access process is not initiated, listening for a TA message broadcast by another UE and obtaining a TA value from the TA message; C, transmitting uplink data according to the obtained TA value; D, if the uplink data is successfully transmitted, continuing to perform E, and if the uplink data is unsuccessfully transmitted, returning to A; and E, generating a TA message according to the obtained TA value, and broadcasting the generated TA message. By means of the method in the present application, the time delay and the power consumption can be reduced.