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The unmanned ground system (UGS) demands the high data rate and link reliability in battlefield and hazardous environment. Also, more radio resources should be allocated in the uplink channel for the surveillance data than in the downlink channel, unlike the commercial communication system where the utilization of resources is biased toward the downlink to provide the multimedia service to the multiple...
In this paper, we design Multi-hop Relaying Network(MRN) to control Mobile Stations(MS's) based on moving pictures. The designed MRN employees a centralized Medium Access Control(MAC) and a routing algorithm instead of distributed algorithms widely used in Ad-Hoc Network. It is because the centralized algorithm has advantages in our applications, in which most data traffics are concentrated to Base...
In this paper, we propose an effective contention-based bandwidth request scheme to differentiate the contention scheme of each quality of service(QoS) type in IEEE 802.16e systems. Especially, the scheme is focused on the improvement for extended real-time polling service(ert-PS). The proposed scheme allows the ert-PS to use multicast polling in the normal condition, but to adopt both multicast and...
The MIL-STD-188-220 is the military tactical wireless mobile ad-hoc communication standard which makes a smooth data and voice communication possible. This standard is known as the Interoperability Standard for Digital Message Transfer Device Subsystems. However, the standard has the problem to generate the meaningless traffic due to the failure of topology update, in the case of transmitting the...
Ranging in wireless access is the process to acquire up-link synchronization, control the power between personal subscriber station and base station and perform the bandwidth request to BS. In this paper, we evaluate the capacity of a ranging subchannel in terms of the ranging code error probability versus the number of active users to attempt ranging, referring to specifications for the Korea's 2...
Ranging in wireless access is the process to acquire up-link synchronization, control the power between personal subscriber station and base station and perform the bandwidth request to BS. In this paper, we evaluate the capacity of a ranging subchannel in terms of the ranging code error probability versus the number of active users to attempt ranging, referring to specifications for the Korea's 2...
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