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Bibliographic Details
Main Author:	Roberto Carlos Guevara C.
Format:	Artículo científico
Language:	es
Published:	Universidad Militar Nueva Granada 2013
Subjects:	Ingeniería WiFi redes Interferencia solapamiento de canales
Online Access:	https://www.redalyc.org/articulo.oa?id=91130493001
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UNA PROPUESTA DE SOLUCIÓN AL PROBLEMA DE LA INTERFERENCIA ENTRE REDES WIFI POR SOLAPAMIENTO DE CANALES Roberto Carlos Guevara C. Édgar Serna M. Ingeniería WiFi redes Interferencia solapamiento de canales La amplia utilización de redes WiFi en los diversos escenarios sociales está generando una especie de saturación de canales, que a su vez ocasiona interferencia entre estas redes. Esta situación genera solapamiento de canales, lo que hace que las tasas de trasferencia se reduzcan. En este artículo se detalla esta situación, y se estructura y aplica un experimento para encontrarle solución al problema. También se presentan los resultados tabulados y graficados utilizando la herramienta de software libre inSSider. 2013 artículo científico 0124-8170 https://www.redalyc.org/articulo.oa?id=91130493001 es http://www.redalyc.org/revista.oa?id=911 Ciencia e Ingeniería Neogranadina application/pdf Universidad Militar Nueva Granada Ciencia e Ingeniería Neogranadina (Colombia) Num.2 Vol.23

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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