RIS-Assisted Bandwidth Allocation to Prevent UE Collisions
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Solution Overview
Problem
Collisions occur among multiple user equipments using the same frequency band in the same area, leading to inefficiencies in data transfer and potential interference in wireless communication systems.
Innovation Solution
A method for bandwidth allocation implemented by a base station that groups user equipments into groups sharing the same frequency band by using reconfigurable intelligent surfaces (RISs) to minimize interference, leveraging spatial diversity to ensure UEs in different cells of RISs use the same frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user equipments use the same frequency band to transmit data simultaneously in the same area, then data transfer volume increases, but collision and interference occur among the user equipments
Solution Approach 1:
The base station segments user equipments into different groups based on their received signal strength indicators (RSRPs) from different RIS cells. UEs with similar RSRP values are grouped together and allocated the same frequency band, while different groups use different frequency bands. This segmentation prevents collisions between UEs on the same frequency band while allowing simultaneous transmission within each group, thereby increasing overall data transfer volume without sacrificing transmission reliability.
2Reliability
If the base station allocates different frequency bands to all user equipments to avoid collision, then transmission reliability improves, but bandwidth efficiency decreases
Solution Approach 1:
The base station applies local quality by allocating frequency bands based on local conditions - specifically, the RSRP values of UEs from different RIS cells. UEs experiencing similar channel conditions (similar RSRPs) are grouped together and allowed to share the same frequency band, while UEs with different channel conditions are assigned different frequency bands. This localized allocation strategy ensures transmission reliability for each group while maximizing bandwidth utilization across the entire system.
3Productivity
If the base station groups user equipments by allocating the same frequency band to UEs in the same group, then bandwidth efficiency improves, but computational complexity increases
Solution Approach 1:
The base station changes the parameter used for grouping from complex multi-dimensional UE characteristics to a single dominant parameter - the RSRP value from different RIS cells. By sorting UEs based on this single parameter and grouping those with similar RSRP values, the system achieves efficient bandwidth allocation while minimizing computational complexity. This parameter simplification allows for straightforward implementation without requiring complex algorithms.
Data Source
AI summary
A method for bandwidth allocation is to be implemented by a base station (BS) that communicates with a plurality of reconfigurable intelligent surfaces (RISs). The method comprising steps of: receiving a plurality of join messages respectively from a plurality of user equipments (UEs) via the RISs, the join messages being transmitted simultaneously by the UEs in a contention area according to a map message; and according to the join messages, grouping the UEs into at least one group by allocating a frequency band within the contention area to each of the at least one group, wherein those of the UEs in the same group share the same frequency band.