Bandwidth Aggregation and Concurrent Multipath Transfer of Data

The faster growth of Internet, the upgradation of technology and decreased cost of electronic components, increasingly number of users are using the mobile data access and data transfer by using various network interfaces for the devices such as laptop, notebook, tablet and smart-phone using various Radio access technologies(RAT) like 802.11, Bluetooth, GSM, 3G, WiMAX etc. The existing wireless technologies vary with services provided like bandwidth, price, coverage, quality of service support. If there is restriction on the usage of these available resources as interfaces on the user device as single interface at a time limits the flexibility and better utilization. So by using multiple interfaces simultaneously, can improve quality and deliver support for applications requiring high bandwidth. Further delay can be reduced when alternate path of communications are kept alive enhancing the reliability of data. Heterogeneous wireless network is a wireless communication system where Internet services will be given and delivered by using multiple technologies like Wi-Fi, GSM and WiMAX etc. There are some Internet applications that demands high bandwidth and therefore, the bandwidth of an individual interface need to be aggregated to form a high speedy logical link. Bandwidth aggregation in heterogeneous wireless network will provide many of benefits for real time applications. Different range of bandwidths which can be operated independently, so aggregation of these different bandwidths can be used into a multi-mode device which will help to improve the performance of real-time applications. Concurrent Multipath Transfer (CMT) scheme in multihomed mobile networks is having a problem of the utilization of different paths with diverse delays. These delays may cause packet reordering among packets of the same flow. The reordering makes worse situation in TCP by bringing more time outs and unnecessary retransmissions. This will degrade the throughput of connections.