Adaptive strategies for efficiently locating internet-based servers in MANETs

Hybrid Scheme for Discovering and Selecting Internet Gateway in Mobile Ad Hoc Network

“…In addition to the reactive or proactive gateway discovery schemes [1][2][3][4][5][6][7][8][9][10][11][12] there are some research works [9] [ [13][14][15][16][17][18][19] that proposed hybrid gateway discovery schemes. In the hybrid schemes, the time-to-live (TTL) value of the gateway advertisements is kept limited to certain boundary in order to contain the proactive discovery within an optimum range.…”

“…Like [1][2][3] [5] [7] [9] [13][14][15][16][17][18] [22], we consider hop count to select the best gateway. It denotes the number of nodes or routers between a mobile node and an Internet gateway.…”

“…It is the benchmark mobility model that has been used in many research works [3][4] [6-9] [11][12][13][14][15][16][17][18][19][20][21] in order to evaluate network protocols in MANET. According to this model, a mobile node remains stationary for a certain period called pause time.…”

“…Reactive schemes scale poorly regarding the number of sources willing to access the Internet. Few research works [9] [13][14][15][16][17][18][19] proposed hybrid gateway discovery schemes where the dissemination of gateway advertisements is kept limited to a small area by setting appropriate Time to Live (TTL). Nodes outside the TTL coverage area reactively find their gateways.…”

“…Gateway selection schemes proposed in [1][2][3] [5] [7] [9] [13][14][15][16][17][18] use hop count only to select a gateway. In these schemes, all the nodes always select the nearest gateway, a gateway may become a bottleneck under heavy traffic load and there is no remedy for this problem.…”