Current satellite systems operate according to circuit switching transfer modes. To improve flexibility and efficiency, several kinds of packet switching systems have been proposed. However, it appears that full packet switches are still considered complex and expensive, when implemented on board the satellites. For the time being, a compromise has been found in satellite networks with Dynamic Bandwidth Allocation Capabilities (DBAC). Such systems are based on classical circuit switches, but the DBAC payload allows changing dynamically the capacity of each connection, without the need of tearing-down and setting-up again the connection itself. In this paper we consider a DBAC satellite system and define algorithms to allocate the bandwidth so as to provide deterministic and statistical QoS guarantees. The traffic sources are regulated by standard Dual Leaky Buckets (DLBs). We define bandwidth-handling policies, design Connection Admission Control rules and evaluate analytically the system performance. As expected, the numerical results show a significant increase of the overall utilization factor of our system, when compared with a plain circuit switching solution.
Dynamic Bandwidth Allocation in a Circuit-Switched Satellite Network: Provision of Deterministic and Statistical QoS guarantees
FEMMINELLA, Mauro;REALI, Gianluca
2000
Abstract
Current satellite systems operate according to circuit switching transfer modes. To improve flexibility and efficiency, several kinds of packet switching systems have been proposed. However, it appears that full packet switches are still considered complex and expensive, when implemented on board the satellites. For the time being, a compromise has been found in satellite networks with Dynamic Bandwidth Allocation Capabilities (DBAC). Such systems are based on classical circuit switches, but the DBAC payload allows changing dynamically the capacity of each connection, without the need of tearing-down and setting-up again the connection itself. In this paper we consider a DBAC satellite system and define algorithms to allocate the bandwidth so as to provide deterministic and statistical QoS guarantees. The traffic sources are regulated by standard Dual Leaky Buckets (DLBs). We define bandwidth-handling policies, design Connection Admission Control rules and evaluate analytically the system performance. As expected, the numerical results show a significant increase of the overall utilization factor of our system, when compared with a plain circuit switching solution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
