Previous proposals to provide multicasting over mobile IP focus mainly on recipient mobility and little attention has been given to the case when the mobile host (MH) is also the source. In this paper, we have attempt...
详细信息
ISBN:
(纸本)0780374002
Previous proposals to provide multicasting over mobile IP focus mainly on recipient mobility and little attention has been given to the case when the mobile host (MH) is also the source. In this paper, we have attempted to address the case when the MH is a source as well as a recipient of a given multicast session and more than one source is participating in the session. The basic essence of the problem is that the effect of receiver movement on the multicast tree is local while it may be global for source movement and it may affect the complete multicast delivery tree. We have used a MH initiated approach for multicast handoff and introduced a unified solution and made the effect of the MH movement local, irrespective of whether it is working as a source or a recipient of a multicast group. We examine and compare our proposed approach to existing approaches by simulating under various traffic environments and we observe an improved performance.
Wireless sensor networks are expected to find wide applicability and increasing deployment in the near future. In this paper, we propose a formal classification of sensor networks, based on their mode of functioning, ...
详细信息
In this paper, we propose an analytical modeling for integrated wireless networks with priority reservation and preemptive priority procedures. In our scheme, calls are separated into four different classes: originati...
详细信息
In this paper, we propose an analytical modeling for integrated wireless networks with priority reservation and preemptive priority procedures. In our scheme, calls are separated into four different classes: originating voice calls, originating data calls, voice and data handoff request calls. In the proposed scheme, there are queues for handoff request calls. Some number of channels in each cell are reserved exclusively for handoff request calls. Out of this number of channels, some are reserved exclusively for voice handoff requests. The remaining channels are shared by both originating and handoff request calls. Higher priority is given to voice handoff requests over data handoff requests and can preempt the service of ongoing data calls if on arrival it finds no free channels. A three-dimensional Markov chain model is used to determine system performance in terms of blocking probabilities of originating calls, forced termination probability of voice handoff requests calls, and average transmission delay of data calls.
Optimal scheduling of tasks represented by a directed acyclic graph (DAG) onto a set of homogeneous processors, is a strong NP-hard problem. In this paper we introduce a scalable scheduling scheme called STDS for hete...
详细信息
Optimal scheduling of tasks represented by a directed acyclic graph (DAG) onto a set of homogeneous processors, is a strong NP-hard problem. In this paper we introduce a scalable scheduling scheme called STDS for heterogeneous systems. This implies that tasks could potentially have different run times on different processors. The complexity of STDS is O(v/sup 2/) where v is the number of nodes in the task graph. Schedule length is primarily reduced by selected task duplication. Current task duplication based scheduling schemes are mostly done for homogeneous systems. Comparing the performance of STDS with BIL, another scheduling scheme for heterogeneous systems, it is observed that STDS obtained speed-ups of 6 to 40 generating shorter schedules when sufficient duplication can be carried out.
暂无评论