Random Access Preamble and Msg3 Frequency Mapping
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Solution Overview
Problem
The existing random access procedure in wireless communication systems is complex and burdensome, particularly for user equipment (UE) seeking to establish or re-establish a connection with a base station, which hinders efficient data transmission and reception, especially in high-priority communication environments like V2X communication.
Innovation Solution
A simplified random access procedure where a UE transmits a random access preamble and a third message (Msg3) through specific channels, with the Msg3 being scrambled and mapped to the same frequency and time region as the preamble, allowing for faster signal/data transmission and receipt by simplifying the Physical Random Access Channel (PRACH) process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the existing random access procedure is used, then connection establishment is reliable, but the procedure is complex and requires considerable message exchange
Solution Approach 1:
The patent combines the random access preamble transmission and Msg3 transmission into the same time-frequency resource region. This merging eliminates the need for separate resource allocation and signaling for Msg3, thereby simplifying the random access procedure and reducing message exchange complexity while maintaining connection establishment reliability
Solution Approach 2:
The patent makes the PRACH resource region serve dual purposes: transmitting the random access preamble and transmitting Msg3. This multi-functionality reduces the overall resource requirements and procedure complexity while achieving the same connection establishment objective
2Productivity
If the existing random access procedure is used, then connection establishment is reliable, but the transmission time is longer
Solution Approach 1:
By merging preamble and Msg3 transmissions into the same resource region, the patent eliminates the time required for separate Msg3 transmission and its associated scheduling signaling, thereby reducing the overall random access procedure duration while maintaining reliable connection establishment
Solution Approach 2:
The patent performs Msg3 transmission in advance within the same resource region as the preamble, eliminating the need for subsequent separate transmission steps. This preliminary action reduces the total time required for connection establishment while ensuring reliable delivery
Data Source
AI summary
A method for performing a random access procedure, by a terminal, in a wireless communication system according to an embodiment of the present invention may comprise the steps of: transmitting, to a base station, a random access preamble through a PRACH, and a third message (Msg3) through a PUSCH; and receiving, from the base station through a PDSCH, a random access response message as a response to the random access preamble, and a contention resolution message as a response to the Msg3, wherein a control message, which indicates the Msg3 or a resource area to which the Msg3 is mapped, may be mapped to a frequency area identical to a frequency area to which the random access preamble is mapped, within a subframe to which the random access preamble is mapped.