Short-Format PUSCH++ Merges DMRS and Uplink Data for Faster RACH Access
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Solution Overview
Problem
Conventional two-step RACH procedures in 5G networks experience significant latency and resource consumption, particularly in time-sensitive applications, due to separate transmissions of PRACH preambles and PUSCH data, which hinder efficient UE access to the network.
Innovation Solution
An enhanced RACH procedure using an enhanced PUSCH format (PUSCH++) that combines DMRS and PUSCH data in a single transmission, replacing separate PRACH preamble and PUSCH transmissions, allowing simultaneous UE identification, synchronization, and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If separate PRACH preamble and PUSCH transmissions are used in conventional two-step RACH procedures, then UE identification and data transmission can be performed, but transmission time and resource consumption increase significantly
Solution Approach 1:
The patent combines the PRACH preamble transmission and PUSCH data transmission into a single unified transmission structure. The PUSCH transmission is configured to carry both the DMRS (which serves as the preamble for UE identification) and the uplink data simultaneously, eliminating the need for separate transmission time slots and reducing overall RACH procedure latency.
Solution Approach 2:
The PUSCH transmission structure is enhanced to serve multiple functions: it acts as both the preamble (via DMRS) for UE identification and synchronization, and simultaneously carries the uplink data payload. This multi-functional design reduces the number of separate transmission resources needed while maintaining all necessary communication functions.
2Loss of energy
If separate PRACH preamble and PUSCH transmissions are used, then transmission reliability is maintained, but resource consumption increases
Solution Approach 1:
By merging the preamble and data into a single PUSCH transmission, the patent reduces the total number of transmission resources consumed (time slots, frequency resources, power) while maintaining transmission reliability through the unified structure that ensures both identification and data delivery in one reliable transmission event.
3Productivity
If conventional two-step RACH procedure is used, then initial access is enabled, but latency in time-sensitive applications increases
Solution Approach 1:
The patent merges preamble and data transmission into a single simultaneous operation, effectively halving the number of transmission steps required for initial access. This directly reduces RACH procedure latency and improves initial access speed for time-sensitive applications.
Solution Approach 2:
The PUSCH transmission is pre-configured with DMRS that serves as the preamble, so that when the PUSCH is transmitted, the UE identification and data transmission occur simultaneously without waiting for separate transmission opportunities, thereby reducing overall access time.
Data Source
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AI summary
There is provided a method of performing a RACH procedure to provide a User Equipment UE access to a network (3) in a communication system (100), the network comprising at least one base station (2), the RACH procedure comprising at least one step in which a RACH message is sent from the UE to the base station on one or more uplink channels, wherein said message comprises an enhanced PUSCH transmission (PUSCH++) comprising a DMRS part and a PUSCH data part, the DMRS part being sent to serve as a preamble, wherein the method comprises transmitting the DMRS part and the PUSCH data part together at the transmission time, the enhanced PUSCH having a short length format.