Random Access Frequency Hopping for Better Wireless Coverage
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Solution Overview
Problem
Conventional frequency hopping schemes in wireless communication systems provide limited frequency domain diversity gain due to a fixed frequency hopping distance between consecutive random access channel occasions, leading to poor coverage performance and increased probability of preamble conflicts, especially in scattering-rich environments.
Innovation Solution
Adopting a variable frequency hopping distance related to the quantity of random access occasions within a group, allowing for improved frequency domain diversity gain and reduced preamble conflicts by varying the frequency separation based on the number of random access occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed frequency hopping distance of one RB is used between consecutive ROs, then the frequency hopping scheme is simple to implement, but the frequency domain diversity gain is very limited
Solution Approach 1:
The patent applies dynamics by making the frequency hopping distance variable rather than fixed. The frequency hopping distance is dynamically adjusted based on the quantity of random access occasions in the group, allowing the system to adapt to different channel conditions and maximize frequency domain diversity gain while maintaining implementation feasibility
Solution Approach 2:
The patent changes the parameter of frequency hopping distance from a fixed value (one RB) to a variable value determined by the number of ROs in the group. This parameter change enables the system to achieve better frequency domain diversity by spreading preambles across a larger frequency range when needed, while keeping the scheme relatively simple through formula-based calculation
2Ease of operation
If a fixed frequency hopping distance is used, then the implementation is straightforward, but the coverage performance is poor
Solution Approach 1:
The frequency hopping distance is made dynamic based on the RO group configuration. When the number of ROs in a group is large, the frequency hopping distance increases automatically, improving coverage performance by accessing more diverse frequency resources without complicating the implementation logic
Solution Approach 2:
The system changes the frequency hopping distance parameter adaptively based on the RO quantity parameter. This allows straightforward implementation through parameter calculation while achieving better coverage performance through optimized frequency resource utilization
3Device complexity
If a fixed frequency hopping distance of one RB is used, then the resource allocation is simple, but the probability of preamble conflicts is increased
Solution Approach 1:
The patent segments the frequency resources by adjusting the hopping distance based on RO group size. When ROs are grouped with larger quantities, the frequency hopping distance increases, effectively segmenting the frequency spectrum into more dispersed segments. This reduces preamble conflicts by ensuring that preambles in different ROs occupy more separated frequency resources
Solution Approach 2:
The frequency hopping distance parameter is changed from a fixed small value to a variable larger value based on RO group configuration. This parameter change increases frequency separation between consecutive ROs, thereby reducing the probability that different preambles will collide on the same frequency resource
Data Source
AI summary
A method and device for wireless communication are provided. One example method includes: transmitting a plurality of preambles in a first random access occasion group, the first random access occasion group comprising a plurality of random access occasions; wherein two random access occasions in the first random access occasion group are consecutive in time domain and separated by a first frequency hopping distance in frequency domain, and the first frequency hopping distance is related to a quantity of the plurality of random access occasions comprised in the first random access occasion group.