Recently, because GPS becomes very cheap, many devices can get the geographical information of itself. By using the information, many new services can be realized. As one of them, the push-type service have many attentions. This type service requires geocast (muticast by using of geographical information of devices) technology. Now, many researchers propose new protocols for it, but many of them are without reliability. Then, here, we consider the reliability of geocast and propose new protocols for geocast.
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