Opportunistic communication between licensed users and unlicensed users

Now-a-days the numbers of wireless users are increasing at a faster rate. So we can´t allot spectrum to all the users. The unlicensed users along with licensed users try to occupy the spectrum at a time. Because of this interference will occur when the information is shared between both unlicensed and licensed in the same time period. We have to reduce interference when spectrum is occupied because there is a difficulty in maintaining the expected quality of service for unlicensed users. In this paper we use distributed dynamic spectrum protocol in which both licensed and unlicensed users oppurtunistically operate spectrum at a time. At first channel gain estimates are used to set feasible transmit powers for unlicensed users i.e., device-to-device users here to keep the interference they cause within the allowed interference temperature. Then network information is used when the packets are sent from source to destination. Using network information we can establish either single-hop route or multi-hop route when the data is transferred using route discovery packets. This network information in discovery packet will help reduce the failure rate in discovering the route and also will help increase the percentage savings in the number of discovery transmissions. We will also make analysis to obtain the maximum possible packet delivery rate during the time when information is transferred.