PRACH-PUSCH Random Access for Uplink-Downlink Conflict Control
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Solution Overview
Problem
In mobile communication systems, particularly in 5G, the transmission of uplink data after acquiring uplink synchronization through a random access process can lead to resource consumption and interference due to conflicts between uplink and downlink transmissions, especially in diverse service scenarios requiring high reliability, low latency, and large bandwidth.
Innovation Solution
The terminal device is designed to transmit PRACH and PUSCH in an asynchronous state, adapting the transmission process to avoid conflicts by transmitting PRACH on valid occasions and skipping PUSCH when associated occasions are invalid, thereby reducing interference and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device transmits uplink data through dynamic scheduling or semi-static scheduling after acquiring uplink synchronization, then the uplink data transmission can be performed, but resource consumption and interference occur due to conflicts between uplink and downlink transmissions
Solution Approach 1:
The patent applies dynamics by making the random access process configurable between static (four-step) and dynamic (two-step) modes. The network device can dynamically indicate which mode to use through configuration information, allowing the system to adapt between traditional reliable synchronization (four-step) and efficient data transmission (two-step) based on current network conditions and service requirements, thereby reducing unnecessary resource consumption and interference
Solution Approach 2:
The patent changes the parameter of random access process structure by introducing a two-step random access process that combines PRACH and PUSCH transmissions. By modifying the traditional four-step process into a condensed two-step process where uplink data is transmitted together with the random access preamble, the patent reduces the number of signaling exchanges and resource allocations, thereby reducing resource consumption and interference while maintaining uplink synchronization
2Productivity
If a two-step random access process is implemented to transmit PRACH and PUSCH simultaneously, then resource efficiency is improved, but conflicts between uplink and downlink transmissions may occur
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure multiple PUSCH transmission occasions associated with each PRACH occasion before the actual random access occurs. The terminal device selects from these pre-configured occasions, ensuring that the selected PUSCH transmission does not conflict with downlink transmissions. This advance configuration allows efficient two-step random access while preventing transmission conflicts
Solution Approach 2:
The patent uses feedback mechanisms where the network device monitors the simultaneous PRACH and PUSCH transmissions from terminal devices and provides responses to indicate whether the transmission was successful or if retransmission is needed. This feedback loop allows the system to detect and resolve any transmission conflicts that occur, maintaining resource efficiency while ensuring reliable communication
Data Source
AI summary
An information transmission method includes: if a PRACH transmission occasion is valid and a PUSCH transmission occasion associated with the PRACH transmission occasion is valid, transmitting a PRACH corresponding to a random access message on the PRACH transmission occasion, and transmitting a PUSCH corresponding to the random access message on the PUSCH transmission occasion.