Wireless local area network (WLAN) is the core of the classic wireless communications systems and owns the infrastructure which wide spreads in many regions in the world. IEEE 802.11n is an attractive standard of WLAN and offers a data capacity of the cell. This paper estimates the maximum limits of the IEEE 802.11n standard cell as a term of number of users which are successfully served by the cell in case of video conference application. The results shown that, the cell of 802.11n could serve about 9 users under the service of video conference in case of 20MHz channel bandwidth before congestion occurs while the 40MHz channel could support 18 users.

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IEEE 802.16e is a WiMAX standard which mixes between broadband and wireless. It is based on OFDMA and provides large capacity as compared with other standards that support previous technologies. One of IEEE 802.16e features is to provide quality of service (QoS) as service classes. However, real time applications are a real challenge for systems capacity due to consume heavy data rate such as video conference application. The service classes of 802.16e standard are depended on minimum reserved traffic rate to submit the service. This paper estimates the consuming resources of 802.16e cell during providing video conference service taking into account the minimum reserved traffic rate of service classes related to real time applications and other factors.