Satellite Networking by Sun Zhili

Author:Sun, Zhili
Language: eng
Format: epub
ISBN: 9781118856758
Publisher: Wiley
Published: 2014-04-07T00:00:00+00:00

Figure 4.21 Satellite and MANET network: resource management—automatic access point activation to increase throughput

Applications can be significant differences in terms of services required which imply diverse impacts on the network organisation and usage of resources. Data services (such as file transfers, web services, email, etc.) impose low constraints on delay and latency but have high requirements in terms of reliability and integrity.

Voice and video on the other hand have serious requirements in terms of latency and delay (e.g. the high latencies associated with GEO satellites may hamper communications between emergency teams leading to misunderstandings or late reactions resulting in loss of property or life) but are relatively lax in terms of transmission errors (a few errors in the transmission will result in glitches in video or garbled speech) as the human brain has the power to fill in the gaps. Basically, video and voice require real-time exchanges to be useful. The provision of different services in terms of QoS and QoE is differentiated by prioritisation.

Other interesting issues include the impact of GEO versus LEO satellites on the composite network. The latencies of GEO satellites (approximately 240–270 ms, depending on the location of the satellite terminals) may raise difficulties in voice services under certain situations. The LEO delays of 30 ms are in principle more amenable to the requirements of voice and video. The network must be able to perform trade-offs and choose the appropriate satellite service (if both GEO and LEO services are available) according to the desired service.

The network optimisation should consider such as operation and services costs, energy consumption, QoS, availability and so on. This is closely related to the application scenario and is strongly influenced by the application chosen.

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