ENHANCEMENT OF QOS OF VOIP IN HETEROGENEOUS SITES

N. Balavenkatesh

Abstract— The raising demand for high speed services is definitely causing the cellular network providers to consider pertaining to the integration of Wireless LOCAL AREA NETWORK with GPRS. WLAN is having higher info rate nevertheless low coverage area although GPRS is having lower info rate good results . high protection area. Thus integrating these two heterogeneous sites will result in utilization of benefits of both and can increase the system throughput. The handoff latency is reduced by with the threshold ideals of both the networks and anticipating the handoff some time before. Especially the bundle loss is very eradicated simply by multicasting the packets through the handoff period and move back to normal mode after the handoff. Hence the program throughput certainly increase simply by certain amount by our method of multicasting.

Keywords— Duplicate Packet Recognition (DPD), Simplified Multicast Forwarding(SMF), Sequence Number Approach(SMA) Loose Coupling(LC), Mobile phone Node(MN), Past Access Router (PAR), Following Access Router(NAR).

I. Launch

Network variety techniques play a vital role in ensuring service quality in heterogeneous networks. Handoff is the term which tells about the movement of mobile client from one access point to an additional.

Voice over IP(VOIP)

Voice over ip (voice over IP) is an IP telephony term for a set of facilities accustomed to manage the delivery of voice details over the Internet. Voice over ip involves mailing voice details in digital form in discrete bouts rather than by using the traditional circuit-committed protocols with the public switched telephone network (PSTN). A significant advantage of Voice over ip and Internet telephony is the fact it eliminates the tolls charged simply by ordinary mobile phone service. To further improve the Quality Of Service(QoS) of VOICE OVER IP the handoff latency needs to be reduced, the packet damage should be decreased or else needs to be nullified as well as the throughput ought to be increased. From this paper the handoff dormancy and supply loss is usually reduced substantially almost nullified using the Multicasting technique. The throughput is usually increase simply by integrating both the heterogeneous networks WLAN and GPRS utilizing the advantages of both the networks in effective manner. Hence the Quality Of Support (QOS) of VOIP has been enhanced drastically by our treatment.

The mixing of WLAN and GPRS will lead to a new program which has high throughput with reduced latency with no packet loss. Multicasting is the strategy which is used to nullify the packet damage as it multicast the packets during the handoff period as a result eliminating the need for jitter barrier[7]. In multicasting the packets will be multicasted to Previous Gain access to Router (PAR), Next Get Router(NAR) at the same time. So that it will eliminate the triangular routing[7] plus the time taken for transfer during handoff by 18 percent. As jitter buffer is certainly not used the network targeted traffic is reduced drastically. The handoff latency is decreased by environment the threshold value for the networks and anticipating the handoff.

3-G systems guarantees higher info rates, but requires huge investment to get a new spectrum and also at present not readily accessible. WLAN technology is very renowned and continues to be deployed around the world. It also offer higher data rates compared to cellular systems. Currently Box Switched systems are not only utilized for data but in addition for voice (Example: Voice over IP). Cost smart WLAN less expensive to deploy than a cell phone network.

Need for integration

Wi-fi LAN could have higher data rate upto 56mbps but may have only low coverage area whereas GPRS will have bigger data charge but excessive coverage region. Hence...

Referrals: Motorola India Research Labs Bangalore, India ian. [email protected] com, 1525-3511/08/$25. 00 © 2008 IEEE

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