PRACH Slot Frequency Hopping for Collision Reduction
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple physical random access channel (PRACH) transmissions, particularly in scenarios where frequency hopping is not effectively utilized, leading to poor frequency diversity and increased collision likelihoods.
Innovation Solution
The implementation of PRACH slot frequency hopping, where multiple PRACH transmissions are sent based on frequency hopping within or between PRACH slots, enhances frequency diversity and mitigates collisions by allowing UEs to transmit at different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is not effectively utilized in PRACH transmissions, then the system structure remains simple, but frequency diversity is poor and collision likelihood increases
Solution Approach 1:
The patent applies frequency hopping to dynamically change the transmission frequency of PRACH signals across different time slots. The frequency hopping pattern allows the UE to transmit on different frequencies in different slots, providing frequency diversity and reducing collision probability while maintaining manageable system complexity through predefined hopping patterns
Solution Approach 2:
The patent changes the frequency parameter of PRACH transmissions over time by implementing frequency hopping. The frequency hopping configuration includes parameters such as hopping pattern, hop size, and timing information, which are used to dynamically adjust the transmission frequency and improve reliability without requiring complex real-time decision-making
2Reliability
If multiple PRACH transmissions are made without frequency hopping, then the transmission process is simple, but collision probability increases
Solution Approach 1:
The patent segments the PRACH transmission process into multiple time slots, with each slot containing multiple PRACH occasions. Frequency hopping is applied at the slot level, where different slots use different frequency resources. This segmentation allows the system to manage multiple transmissions systematically while reducing collision probability through frequency diversity
Solution Approach 2:
The patent implements periodic frequency hopping patterns where the frequency changes in a predetermined sequence across multiple PRACH slots. The frequency hopping pattern is periodic and can be configured based on system parameters, allowing multiple PRACH transmissions to be managed in a structured manner that reduces collisions while maintaining simplicity
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network entity, multiple physical random access channel (PRACH) transmissions based at least in part on a PRACH slot frequency hopping. The UE may receive, from the network entity, a response based at least in part on the multiple PRACH transmissions associated with the PRACH slot frequency hopping. Numerous other aspects are described.