How an efficient TCP/IP implementation can extend the battery life of a mobile device?

Efficient TCP/IP implementation can reduce packet loss rate, data transfer time and resource consumption. Retransmissions of the packet eat up most of the battery power unnecessarily. If the packet loss can be reduced by the efficient flow control and congestion control mechanism then the packet retransmissions reduced significantly that conserve battery energy of a mobile device.

Which of the following applications can run satisfactorily ?

One-way delay measurement of a corporate TCP/IP network spanning two distant sites reveals that the mean one way delay is 500 ms. Which of the following applications can run satisfactorily over this network?
(a) Voice-over IP
(b) File Transfer
(c) Web Browsing
(d) E-mail
(e) Video on demand

Answer: 

Following applications can sun satisfactorily over given network: (a) File Transfer (b) Web Browsing (c) e-mail. 
The reason VOIP and VOD may not run satisfactorily is that the tolerable delay of these applications are several milliseconds only. e.g. <= 400 ms for VOIP. 

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