Handoff has become an inevitable part of wireless cellular communication, Soon users will carry small portable handheld devices which will incorporate the computer, phone, camera, GPS, personal control module etc. This paper proposes a new scheme to deal with seam less roaming and reduce failed handoffs. The simulation is done using software called Qualnet meant for wireless communication. The results clearly indicate the advantages of this new scheme.
Deep Dive into Implementation of Handoff through wireless access point Techniques.
Handoff has become an inevitable part of wireless cellular communication, Soon users will carry small portable handheld devices which will incorporate the computer, phone, camera, GPS, personal control module etc. This paper proposes a new scheme to deal with seam less roaming and reduce failed handoffs. The simulation is done using software called Qualnet meant for wireless communication. The results clearly indicate the advantages of this new scheme.
In the present-day scenario, it is observed that several handoff events take place, while mobile user's move short distances, thereby causing poor QoS and undue load on base station processors. Service providers would welcome the possibility of reducing the no. of base stations during deployment of mobile services. The outcome of reduced handoff would result in ultimately improving the QoS and there by suggesting reduction in no. of base stations. It is also observed that when a mobile device such as a laptop is moved from one access point to another it needs to reconfigure itself, usually by human intervention. In situations where the event is VOIP or video streaming, then such a hindrance is not welcome.
The continuation of an active call is one of the most important quality measurements in cellular systems. Handoff process enables a cellular system to provide such a facility by transferring an active call from one cell to another. Different approaches are proposed and applied in order to achieve better handoff service. The principal parameters used to evaluate handoff techniques are, forced termination and call blocking probability. Mechanisms such as guard channels and queuing handoff calls decrease the forced termination probability while increasing the call blocking probability. A good amount of research is done, in suggesting handoff algorithms. However, apparently, few have tried to simulate a handoff scenario and obtain results to improve QoS.
A simulation-based study for handoff is required and it is anticipated to improve QoS. Future campuses such as industry or academic will be equipped with access points at every corner to facilitate wireless Internet connectivity. These wireless access points can act as nano base stations such that they can route calls/messages to the service provider’s base stations. Several routing algorithms/ hand shake algorithms are already in place and these can be used for such access. It is also evident that most of the mobile phone users remain indoors during most of their working hours and hence connectivity through access points seems quite reasonable.
In computer networking, a wireless access point (WAP or AP) is a device that allows wireless communication devices to connect to a wireless network using Wi-Fi , Bluetooth or related standards. The WAP usually connects to a wired network, and can relay data between the wireless devices (such as computers or printers) and wired devices on the network. Prior to wireless networks, setting up a computer network in a business, home, or school often required running many cables through walls and ceilings in order to deliver network access to all of the networkenabled devices in the building. With the advent of the Wireless Access Point, network users are now able to add devices that access the network with few or NO cables. Today’s WAP’s are built to support a standard for sending and receiving data using radio frequencies rather than cabling. Those standards and the frequencies they use are defined by the IEEE. Most WAP’s use IEEE 802.11 standards.
- —————N.S.V.Shet is with NITK, Surathkal, India K.Chandrasekaran is with NITK, Surathkal, India K.C.Shet is with NITK, Surathkal, India A typical corporate use involves attaching several WAP’s to a wired network and then providing wireless access to the office LAN. Within the range of the WAP’s, the wireless end user has a full network connection with the benefit of mobility. In this instance, the WAP functions as a gateway for clients to access the wired network. A WAP may also act as the network’s arbitrator, negotiating when each nearby client device can transmit. However, the vast majority of currently installed IEEE 802.11 networks do not implement this, using a distributed pseudo-random algorithm called CSMA/CA instead.
The scheme uses wireless access points (WAP) as the ad-hoc routing station, to connect to the base stations. Wherever a base station access for handoff is not feasible the call is handed over to the wireless access point and call continuity is maintained.
The flow in appendix searches for signals of wireless access points in the vicinity. If the no of access points are more, then it chooses the best signal access point. Once the access point is decided it looks at the type of handoff, like soft or hard handoff and accordingly hands over the call. Eventually it also has certain threshold settings for no of attempts before handoff decision etc.
The scene is created in Qualnet and consists of two base stations, few WAP’s, one mobile stations and one Mobile switching centre. The scene is designed such that the mobile stations which are initially near one of the base stations moves in a circular path to finally come back to the original BS. As the simulation progresses it moves such that it passes near the wireless access points to finally reach the opposite base station. Signal exchanges take place which is clear from the simulations. The resu
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