scholarly journals Joint Multiple Relay Selection and Time Slot Allocation Algorithm for the EH-Abled Cognitive Multi-User Relay Networks

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 111993-112007 ◽  
Author(s):  
Hongyuan Gao ◽  
Shibo Zhang ◽  
Yumeng Su ◽  
Ming Diao ◽  
Minho Jo
Keyword(s):  
Relay Selection ◽  
Time Slot ◽  
Relay Networks ◽  
Slot Allocation ◽  
Allocation Algorithm ◽  
Time Slot Allocation ◽  
Multiple Relay

scholarly journals Power and Time Slot Allocation in Cognitive Relay Networks Using Particle Swarm Optimization

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Pouya Derakhshan-Barjoei ◽  
Gholamreza Dadashzadeh ◽  
Farbod Razzazi ◽  
S. Mohammad Razavizadeh
Keyword(s):  
Particle Swarm Optimization ◽  
Time Slot ◽  
Particle Swarm ◽  
Relay Networks ◽  
Slot Allocation ◽  
Secondary Users ◽  
Swarm Optimization ◽  
Cognitive Relay Networks ◽  
Primary Users ◽  
Time Slot Allocation

The two main problems in cognitive radio networks are power and time slot allocation problems which require a precise analysis and guarantee the quality of service in both the primary and secondary users. In this paper, these two problems are considered and a method is proposed to solve the resulting optimization problem. Our proposed method provides an improved performance in solving the constrained nonlinear multiobject optimization for the power control and beamforming in order to reach the maximum capacity and proper adaption of time slots, and as a result a new scheme for joint power and time slot allocation in cognitive relay networks is proposed. We adopt space diversity access as the secondary users access scheme and divide the time between multiple secondary users according to their contribution to primary user’s transmission. Helping primary users provides more opportunities for secondary users to access the channel since the primary users can release the channel sooner. In contrast, primary network leases portion of channel access time to the secondary users for their transmission using particle swarm optimization (PSO). Numerical studies show good performance of the proposed scheme with a dynamic cost function in a nonstationary environment.

Hierarchical Time-Slot Allocation for Dynamic Bandwidth Control in Optical Layer-2 Switch Network

2014 ◽  
Vol E97.B (7) ◽  
pp. 1303-1312 ◽  
Author(s):  
Masahiro NAKAGAWA ◽  
Kyota HATTORI ◽  
Naoki KIMISHIMA ◽  
Masaru KATAYAMA ◽  
Akira MISAWA
Keyword(s):  
Time Slot ◽  
Slot Allocation ◽  
Layer 2 ◽  
Bandwidth Control ◽  
Optical Layer ◽  
Time Slot Allocation ◽  
Dynamic Bandwidth
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