Two-Step NR Random Access PUSCH Mapping for Msg1 Reliability
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Solution Overview
Problem
The existing New Radio (NR) communication systems lack a definite solution for the transmission resource required for Msg1 in the simplified two-step contention random access, leading to incomplete network communication procedures and unreliable network connections.
Innovation Solution
A method is provided to determine a first physical uplink shared channel (PUSCH) resource for transmitting Msg1 based on configuration information, including reference signals like synchronization signal blocks (SSB) and channel state information reference signals (CSI-RS), using performance indicators such as RSRP, RSRQ, and SINR, and threshold values to select the appropriate resource for message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a simplified two-step contention random access procedure is introduced to reduce access delay, then the access delay is reduced, but the transmission resource for Msg1 becomes undefined leading to incomplete communication procedures
Solution Approach 1:
The network device pre-configures PUSCH transmission resources for Msg1 before the random access procedure begins. This preliminary allocation ensures that when the terminal needs to transmit Msg1, the resource is already determined and available, eliminating the resource definition problem while maintaining the simplified two-step procedure's low delay advantage
Solution Approach 2:
The PUSCH transmission resource acts as an intermediary element that bridges the terminal and network device for Msg1 transmission. By introducing this pre-configured resource mechanism, the patent enables complete communication procedures in the simplified two-step random access without requiring additional signaling exchanges
2Reliability
If configuration information is provided for simplified two-step random access including PUSCH resources, then the transmission resource for Msg1 is defined ensuring complete procedures, but the signaling overhead increases
Solution Approach 1:
The configured PUSCH resources serve multiple functions: they are used for both uplink data transmission and for Msg1 transmission in the random access procedure. This multi-functionality reduces the need for separate dedicated resources for random access, thereby minimizing additional signaling overhead while ensuring complete communication procedures
Solution Approach 2:
The patent utilizes existing configuration information parameters and repurposes them to include PUSCH resource allocations for Msg1. By modifying the usage of existing configuration parameters rather than introducing entirely new signaling elements, the patent reduces signaling overhead while ensuring complete communication procedures
Data Source
AI summary
The present disclosure provides a random access method, a terminal and a network device. The random access method, performed by a terminal, includes: obtaining configuration information of a target random access; determining a first physical uplink shared channel (PUSCH) resource for transmitting a message 1, according to the configuration information; on the first PUSCH resource, transmitting the message 1 of the target random access.