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To minimize the power consumption of a mobile device, mobile WiMAX based on IEEE 802.16/802.16e defines three power saving classes for transmitting different types of data traffic. However, the standard specification does not suggest a power saving class for transmitting background TCP traffic, such as a long FTP session. This paper investigates the energy efficiency of TCP transmission over a WiMAX...
In view of the functions and requirements of the encrypted traffic adaptive wireless image sensor network based on 6LoWPAN, this paper presents a new scheme of IPV6 header compression which improves the compression ratio of the IPv6 header. Then a modified S-MAC protocol is presented for traffic adaptation and its performance is tested with NS2. The simulation results show that the energy efficiency,...
The efficiency of power saving mechanism on wireless communications will influence the time the mobile stations (MSs) can operate. Due to the characteristics of centralized control in WiMAX system, the sleeping period of each subscriber is dominated by a base station (BS) based on their service types, traffic loads, and expected sleeping periods. The power saving mechanism uses an exponential backoff...
This paper introduces the reservation packet medium access control (RP-MAC) protocol for wireless sensor networks (WSNs). The protocol incorporates a periodic listen/sleep schedule to conserve energy and employs a novel channel reservation mechanism to enhance the rate at which packets can be transferred over multiple hops, thereby improving throughput and reducing end-to-end delay. To evaluate the...
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