Input Queued Switches: Cell Switching vs. Packet Switching

— Input Queued(IQ) switches have been very well studied in the recent past. The main problem in the IQ switches concerns scheduling. The main focus of the research has been the fixed length packet-known as cells-case. The scheduling decision becomes relatively easier for cells compared to the variable length packet case as scheduling needs to be done at a regular interval of fixed cell time. In real traffic dividing the variable packets into cells at the input side of the switch and then re-assembling these cells into packets on the output side achieve it. The disadvantages of this cell-based approach are the following: (a) bandwidth is lost as division of a packet may generate incomplete cells, and (b) additional overhead of segmentation and reassembling cells into packets. This motivates the packet scheduling: scheduling is done in units of arriving packet sizes and in non-preemptive fashion. In [7] the problem of packet scheduling was first considered. They show that under any...

• Type: Conference
• Year: 2003
• Where: INFOCOM
• Authors: Yashar Ganjali, Abtin Keshavarzian, Devavrat Shah
• Keywords: Admissible Traffic, Communications, INFOCOM 2003, Packet Based Mwm, Packet Scheduling