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AU-KBC RESEARCH CENTRE

• Dynamic Packet Assignment (DPA)
• Ad Hoc Networking
• Network Simulation
• QoS on WLAN

Dynamic Packet Assignment (DPA)

Wireless systems  of the future are   expected to support applications that require flexible data rates. With the limited availability of radio resources, high spectral efficiency is another necessary feature. Our focus is on  dynamic resource  allocation in 4G wireless systems and development  of a flexible MAC protocol that can accommodate Multi-media traffic.

 DPA:

      Packetized transmission over wireless links makes it possible to achieve a high statistical multiplexing gain. High  efficiency resource management and  packet admission can be achieved due to DPA.


       System capacity can be enhanced with Wideband OFDM  which requires OFDM based physical layer techniques and DPA based MAC techniques . OFDM overcomes physical layer barriers for attaining high bit rates and DPA enables aggressive packet access with high spectrum efficiency.

Issues under study:

• Allocation of radio resources and controlling the transmit power of and to the users  depending  on the positions of the users and the channel conditions.
• Fair scheduling of packets in the downlink to meet the Qos requirements.
• Adaptation to different types of applications and across different types of networks.
• Work done:
• Channelized cellular systems have been taken into consideration .
• Analytical model has been developed for computing delay and throughput in the up-link for a data-only system using dynamic packet assignment (DPA).
• Simulation models have been developed to study the delay and throughput performance for data-only systems in both the up-link and in the down-link.  Scheduling  schemes have been incorporated in the  downlink  enabling QoS gaurantees.

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Ad Hoc Networking

 We are working on inter-connectivity and cross-layer issues in ad hoc networks. Aim  is to provide practical solutions to complex wireless networking issues through ad  hoc networking techniques. We are considering relay-networking,  hierarchical-networking, mesh-networking etc as basic scenarios. We also plan to  extend these to networks with multi-mode nodes which will help realise the next  generation communication networks that interact.

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Network Simulation

 We are working on extending the network simulator, ns2 with both codes at the core and the script  level. Modules to handle specific problems in wireless networking are being added. Here is a short tutorial on ns2.

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QoS on WLAN

 Consulting project: The AU-KBC research centre has worked with Ushustech. Pvt. Ltd., Trivandrum on a consulting project in the WLAN area. It involved developing and simulating enhanced MAC with QoS considerations. (IEEE 802.11e).