Beamforming Random Access Resource Allocation for 5G UEs
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Solution Overview
Problem
In millimeter wave communication systems, random access collisions between UEs occur due to the competition for limited RA resources, where UEs with fewer reception beam links are disadvantaged, leading to reduced access success rates.
Innovation Solution
A method where UEs determine the number of reception beams connected to their transmission beams, allocate corresponding radio transmission resources, and perform random access to prevent collisions by ensuring fair access to RA resources based on the number of reception beam links, thereby prioritizing UEs with higher ranks or more links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple UEs compete for limited random access resources in millimeter wave communication systems, then the system can support more users, but random access collisions increase and access success rates decrease
Solution Approach 1:
The patent segments the random access resource selection process by dividing UEs into different groups based on their reception beam link counts. Each group is assigned specific RA resources (time-frequency resources and beam resources), preventing collisions between UEs with different numbers of reception beam links. This segmentation resolves the contradiction by allowing multiple users to access simultaneously without interference.
Solution Approach 2:
The patent implements preliminary classification of UEs according to their reception beam link counts before the random access procedure. The BS determines the number of reception beam links for each UE and pre-assigns appropriate RA resources. This preliminary action ensures that when UEs attempt random access, they use dedicated resources that do not conflict with others, thereby maintaining high access success rates while supporting multiple users.
2Productivity
If UEs with fewer reception beam links use the same random access resources as UEs with more links, then resource utilization is maximized, but UEs with fewer links suffer from higher collision rates
Solution Approach 1:
The patent applies local quality by providing different RA resource configurations to different UE groups based on their specific conditions (number of reception beam links). UEs with fewer reception beam links are assigned RA resources that are less likely to collide, while UEs with more links use different resources. This localized resource allocation ensures that each UE group experiences optimal access conditions, resolving the unfair collision scenario while maintaining overall resource utilization efficiency.
Solution Approach 2:
The patent changes the resource allocation parameters dynamically based on the number of reception beam links. Different time-frequency resources and beam resources are assigned according to the UE's reception beam link count. This parameter change approach ensures that UEs with fewer links have dedicated resources with lower collision probability, while still allowing the system to support multiple users effectively.
3Reliability
If the system assigns dedicated random access resources to each UE based on reception beam links, then collision is prevented, but system complexity increases
Solution Approach 1:
The BS performs preliminary determination of the number of reception beam links for each UE before the random access procedure. This preliminary action allows the system to pre-configure appropriate RA resources for each UE group, avoiding the need for complex real-time resource allocation during random access. The complexity is managed by performing the classification and resource assignment in advance, when the system has more processing capacity and information availability.
Solution Approach 2:
The patent segments UEs into discrete groups based on reception beam link counts (e.g., 1 link, 2 links, 3+ links). This segmentation simplifies the resource allocation process by creating clear, manageable categories rather than requiring continuous or individualized resource assignment for each UE. The segmented approach reduces system complexity while still achieving collision-free random access through group-based resource dedication.
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system that will be provided to support higher data transfer rate following a 4G communication system such as LTE. The present disclosure relates to a method of performing random access of a terminal, said method comprising: an operation of determining the number of received beams of a base station connected to transmitted beams of the terminal; an operation of determining an area of wireless transfer resource on the basis of the number of the received beams; and an operation of transmitting random access message in the random access resource defined by the beam resource corresponding to the determined number and the wireless transfer resource corresponding to the determined area.