Abstract
Most recent satellite network research has focused on providing routing services without considering security. In this paper, for the sake of better global coverage, we introduce a novel triple-layered satellite network architecture including Geostationary Earth Orbit (GEO), Highly Elliptical Orbit (HEO), and Low Earth Orbit (LEO) satellite layers, which provides the near-global coverage with 24 hour uninterrupted over the areas varying from 75° S to 90° N. On the basis of the hierarchical architecture, we propose a QoS-guaranteed secure multicast routing protocol (QGSMRP) for satellite IP networks using the logical location concept to isolate the mobility of LEO and HEO satellites. In QGSMRP, we employ the asymmetric cryptography to secure the control messages via the pairwise key pre-distribution, and present a least cost tree (LCT) strategy to construct the multicast tree under the condition that the QoS constraints are guaranteed, aiming to minimize the tree cost. Simulation results show that the performance benefits of the proposed QGSMRP in terms of the end-to-end tree delay, the tree cost, and the failure ratio of multicasting connections by comparison with the conventional shortest path tree (SPT) strategy.
Highlights
Satellite networks are characterized by global coverage, cost-effective broadcast and multipoint capabilities, flexible network configuration and capacity allocation, bandwidth-on-demand flexibility, etc
For the sake of better global coverage, we introduce a novel triple-layered satellite network architecture including Geostationary Earth Orbit (GEO), Highly Elliptical Orbit (HEO), and Low Earth Orbit (LEO) satellite layers, which provides the near-global coverage with 24 hour uninterrupted over the areas varying from 75° S to 90° N
On the basis of the hierarchical architecture, we propose a quality of service (QoS)-guaranteed secure multicast routing protocol (QGSMRP) for satellite IP networks using the logical location concept to isolate the mobility of LEO and HEO satellites
Summary
Satellite networks are characterized by global coverage, cost-effective broadcast and multipoint capabilities, flexible network configuration and capacity allocation, bandwidth-on-demand flexibility, etc. Two multicast routing algorithms based on the dynamic approximate center (DAC) core selection method, i.e., the core-cluster combination-based shared tree (CCST) algorithm and the weighted CCST algorithm (w-CCST), are presented in [8] The former significantly decreases the average tree cost, and the latter reduces the average end-to-end propagation delay. The future media rich applications such as media streaming, content delivery distribution and real time broadband access require satellite networks that inherently offer user level quality of service (QoS) guarantees In this regard, one of the challenges for multicasting communications in satellite IP networks is to design the QoS multicast routing protocols. On the basis of the novel hierarchical architecture, we adopt the concept of logical locations [6] to isolate the mobility of LEO and HEO satellites and propose a QoS-guaranteed secure multicast routing protocol (QGSMRP) for satellite IP networks.
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