Massive Access Preamble Randomization to Avoid Resource Collisions
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Solution Overview
Problem
In massive access technology, collisions occur on resource blocks when more than two terminals perform sending, leading to access and transmission failures.
Innovation Solution
Add pseudo-random information to preamble parts to differentiate them, ensuring that preamble parts of different terminals are distinct, thereby reducing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple terminals share the same resource blocks for massive access, then the system can support more terminals simultaneously, but preamble collisions occur when more than two terminals send on the same resource block
Solution Approach 1:
The preamble is segmented into two independent parts: a first part sent on physical random access channels (PRACH) for access request, and a second part sent on physical uplink shared channels (PUSCH) carrying data. This segmentation allows different terminals to use the same resource blocks without complete collision, as their preambles are distributed across multiple transmission stages and channels.
Solution Approach 2:
The patent introduces a new dimension by separating preamble transmission from data transmission in both time and channel dimensions. The first preamble part is transmitted on PRACH while the second part is transmitted on PUSCH, creating additional differentiation dimensions beyond simple resource block allocation, thereby reducing collision probability while supporting massive terminals.
2Reliability
If traditional random access is used to avoid preamble collision, then collision is reduced, but time delay increases and fewer terminals can be supported simultaneously
Solution Approach 1:
The patent merges the random access function with data transmission by combining preamble sending and data sending into a unified process. Terminals send both the first preamble part and second preamble part along with data in coordinated transmission, eliminating the need for separate random access procedures and enabling simultaneous support for more terminals without increasing collision risk.
3Device complexity
If identity information is placed in data for encoded transmission in massive access, then user identification during detection is not needed, but resource block collisions occur with more than two terminals
Solution Approach 1:
The preamble is segmented into two independent parts: a first part sent on physical random access channels (PRACH) for access request, and a second part sent on physical uplink shared channels (PUSCH) carrying data. This segmentation allows different terminals to use the same resource blocks without complete collision, as their preambles are distributed across multiple transmission stages and channels.
Data Source
AI summary
Disclosed are an access and transmission method, and a network-side device, a terminal and a storage medium, which are used for solving the problem in the related art of a collision in preamble parts. In the embodiments of the present application, pseudo-random information is added to preamble parts, and the preamble parts and data parts are sent by using resources configured on a network side, such that the preamble parts of different terminals can be made to be as different as possible by using the pseudo-random information, thereby avoiding the problem of multiple collisions being caused due to preamble parts of the terminals being the same.