PRACH Resource Block Index Determination for Wireless Random Access
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in performing random access procedures, particularly in unlicensed bands, leading to increased latency and reduced resource efficiency due to the need for sequential successful channel access procedures in each step of the random access process.
Innovation Solution
The proposed solution involves optimizing the random access procedure by determining the starting Resource Block (RB) index for specific PRACH occasions based on lowest RB indices, starting RB indices of ROs at lowest frequencies, and lowest RB indices of ROs at lowest frequencies, thereby improving the efficiency of channel access and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential channel access procedures are performed in each step of the random access process, then channel access reliability is improved, but access latency increases and resource efficiency deteriorates
Solution Approach 1:
The patent performs channel sensing and validation actions in advance before actual data transmission. The UE senses the channel during the on-duration window and validates channel availability before proceeding with PUSCH transmission, thereby preventing retransmissions and reducing overall access latency while maintaining reliability
Solution Approach 2:
The patent implements dynamic channel access procedures where the UE adapts its transmission timing and resource selection based on real-time channel conditions. The inactivity timer and on-duration window create dynamic opportunities for channel access, allowing the system to respond flexibly to changing channel states and reduce latency when channels are favorable
2Reliability
If sequential channel access procedures are performed in each step of the random access process, then channel access reliability is improved, but resource efficiency deteriorates
Solution Approach 1:
The patent maintains continuous channel monitoring and readiness during the on-duration window, allowing the UE to immediately transmit data when the channel becomes available without returning to sleep mode. This continuous action during critical periods improves resource utilization by eliminating idle time while maintaining reliability through ongoing channel validation
Solution Approach 2:
The UE performs preliminary channel sensing and validation actions before data transmission, ensuring that when transmission opportunities arise, resources are immediately available for use. This preliminary preparation prevents wasted transmission attempts and improves overall resource efficiency while maintaining access reliability
3Adaptability or versatility
If PRACH is transmitted on specific RO among multiple ROs, then random access capability is improved, but determination complexity of starting RB index increases
Solution Approach 1:
The patent divides the frequency resources into multiple RB sets, with each RO associated with a specific RB set. The starting RB index is determined by identifying the lowest RB index within the selected RB set, providing a systematic and manageable approach to resource allocation that reduces determination complexity while maintaining support for multiple ROs
Solution Approach 2:
The patent applies different RB set configurations and starting index rules to different ROs based on their specific frequency positions and associations. Each RO has its own designated RB set with specific starting index characteristics, allowing optimized local resource management while simplifying the overall determination process through localized rules
Data Source
AI summary
A method and a device for transmitting/receiving a signal in a wireless communication system, according to one embodiment of the present invention, perform a two-step or four-step random access procedure, and monitor a PDCCH according to a DRX configuration, wherein the PRACH transmitted in the random access procedure is transmitted on a specific RO from among a plurality of ROs, and a starting RB index of the specific RO can be determined on the basis of (i) the lowest RB index of an RB set including the specific RO, (ii) the starting RB index of an RO positioned at the lowest frequency, and (iii) the lowest RB index of an RB set including the RO positioned at the lowest frequency.