Efficient 3D Positioning of UAVs and User Association Based on Hybrid PSO-<i>K</i>-Means Clustering Algorithm in Future Wireless Networks

<div>The total number of served users versus different backhaul data rates with restrictions <svg height="14.1649pt" id="M192" style="vertical-align:-5.529pt" version="1.1" viewbox="-0.0498162 -8.6359 12.3025 14.1649" width="12.3025pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M578 512C578 619 494 650 387 650H140L134 622C219 615 223 609 210 542L127 119C112 40 104 34 23 28L17 0H235C317 0 387 7 444 33C515 65 564 122 564 195C564 289 495 335 412 352V354C505 373 578 422 578 512ZM486 510C486 422 423 367 314 367H257L294 565C299 591 305 602 315 608C324 614 339 617 362 617C421 617 486 595 486 510ZM466 200C466 100 393 35 296 35C222 35 198 51 212 127L250 333H303C388 333 466 303 466 200Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,7.748,3.132)"><path d="M400 606C400 634 383 656 353 656C316 656 294 620 294 593C294 564 317 545 343 545C375 545 400 573 400 606ZM366 351C379 413 381 451 356 451C323 451 251 408 183 341L199 313C223 335 267 365 277 365C285 365 284 354 277 312C245 132 222 27 193 -100C182 -148 160 -188 131 -188C113 -188 90 -178 75 -170C64 -164 55 -168 48 -175C38 -185 24 -203 24 -222S48 -257 71 -257C89 -257 131 -241 186 -192C243 -141 286 -46 310 74L366 351Z"></path></g></svg> = 5 GHz.</div>

Mobile Information Systems

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Figure 4

Figure 4: Efficient 3D Positioning of UAVs and User Association Based on Hybrid PSO-<i>K</i>-Means Clustering Algorithm in Future Wireless Networks 

Mobile Information Systems

Efficient 3D Positioning of UAVs and User Association Based on Hybrid PSO-K-Means Clustering Algorithm in Future Wireless Networks

Figure 4