By By (author) Ben Abadallah Abderazek
Multicore Systems-on-Chip: functional Software/Hardware layout
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Extra resources for Multicore Systems On-Chip: Practical Software/Hardware Design
Example text
Therefore, the low bit-rate radio must be used for the basic signaling only, and as little as possible for data transfer. To minimize the energy consumption, but also to mitigate interference and increase network capacity, the transmit power on the link should be minimised, if possible. Data link Layer The data link layer is thus responsible for wireless link error control, security (encryption/decryption), mapping network layer packets into frames, and packet retransmission. A sub layer of the data link layer, the media access control (MAC) protocol layer is responsible for allocating the time-frequency or code space among mobiles sharing wireless Design for Low Power Systems 33 channels in a region.
One solution is to broadcast a schedule that contains data transmission starting times for each mobile as in [Sivalingam (2000)]. Another solution is to turn off the transceiver whenever the node determines that it will not be receiving data for a period of time. 32 Multicore Systems On-Chip: Practical Software/Hardware Design Issues Partitioning of tasks Context Adaptation So0urce coding and DSP Application and Services OS & Middleware Congestion control Retransmissions Transport Network Modulation Schemes RF circuits Channel Coding Disconnection Management QoS Management Power management Rerouting Mobility Management Data link Physical Modulation Schemes RF circuits Channel coding Fig.
5) to discuss the energy reduction techniques and trade-offs that involve energy consumption of digital circuits. From these formulas, we can see that there are four ways to reduce power: (1) (2) (3) (4) reduce the capacity load C, reduce the supply voltage V , reduce the switching frequency f , and reduce the switching activity. 2 Reducing voltage and frequency Supply voltage scaling has been the most adopted approach to power optimization, since it normally yields considerable savings thanks to the quadratic dependence of Pswitch on Vdd [Najm (1994)].