Uplink Data Multiplexing via Preamble-Resource Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LTE system's two-step random access mechanism lacks a solution for multiplexing data among multiple users, resulting in inefficiencies in data transmission due to long control-plane delays in uplink multi-beam Physical Random Access Channel (PRACH) transmissions, which do not meet the performance requirements for URLLC scenarios.
Innovation Solution
A data transmitting method and system that determines a data resource corresponding to a preamble in uplink data transmission based on a correspondence relationship between preambles and data resources, allowing for the transmission of uplink data on specific resources such as time, frequency, DeModulation Reference Signal (DMRS), or spreading code, enabling multiplexing of data among users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a two-step random access mechanism is used to reduce control-plane delay, then transmission delay is reduced, but the ability to multiplex data among multiple users is lost
Solution Approach 1:
The patent segments the random access procedure into two distinct steps: msg1 containing preamble plus data, and msg2 containing only preamble. This segmentation allows the system to maintain the simplified two-step structure while introducing specific mechanisms (like different physical channels for data in msg1) that enable multiplexing capabilities among multiple users.
Solution Approach 2:
The patent introduces an intermediary mechanism where the gNB sends indication information to UEs about which preambles can carry data and what uplink data resources are available. This intermediary signaling enables the two-step mechanism to support multiplexing without requiring complex random access procedures, as the network coordinates resource allocation through this indication signaling.
2Productivity
If multiple users transmit data simultaneously in the same resource, then resource utilization is improved, but collision probability increases
Solution Approach 1:
The patent implements dynamic resource allocation where the gNB provides indication information about available uplink data resources and preamble assignments. This dynamic coordination allows multiple users to share resources efficiently while the network manages collision probability by assigning specific preambles and resources to specific users based on current system state.
Solution Approach 2:
The patent changes the parameter space by introducing multiple dimensions for resource differentiation: different preambles, different uplink data resources (time/frequency), and different DMRS configurations. By expanding the parameter space for resource allocation, the system can multiplex more users while maintaining low collision probability through diverse parameter combinations.
3Measurement precision
If different preambles are assigned to different users, then user identification is improved, but resource allocation complexity increases
Solution Approach 1:
The patent makes the preamble serve multiple functions: user identification, resource indication, and data carrying. By designing the preamble with multi-functionality, the system achieves accurate user identification without proportionally increasing resource allocation complexity, as the same preamble structure is used for multiple purposes simultaneously.
Solution Approach 2:
The patent performs preliminary action by having the gNB send indication information to UEs before the random access procedure, informing them about which preambles can carry data and what resources are available. This preliminary coordination simplifies the actual resource allocation during random access, as UEs already know the mapping between preambles and resources in advance.
Data Source
AI summary
Disclosed are a data transmission method, device, and system. The method comprises: for the transmission of random access uplink data, according to the correspondence between preambles and data resources as described by a protocol, determining the data resource corresponding to the preamble in the uplink data transmission, different preambles corresponding to different data resources; transmitting the preamble and the uplink data that uses the determined data resource. In the embodiments of the present invention, a protocol describes the correspondence between preambles and data resources. For the transmission of random access uplink data, the data resource corresponding to the preamble in the uplink data transmission can be determined, and different preambles correspond to different data resources. Thus it can be ensured that different users use different data resources to bear uplink data, thereby enabling the data portion multiplexing for multiple users.