Wireless Cellular Networks  
Start Date: 
Sunday, December 18, 2011 - 10:30 to 12:00
Kochi Campus

Tutorial Speaker:  Dr. Nagabhushana Sindhushayana, Vice President of Technology, Qualcomm, USA

Title:  Heterogeneity and Multi‐cell Cooperation in Wireless Cellular Networks 


The  performance  of  most  urban  cellular  networks  is  limited  by  inter‐cell  interference.   This  is particularly true of a cellular network with heterogeneous infrastructure, wherein the same spectrum is shared  by  different  types  of  base‐stations such  as  macro‐cells,  pico‐cells,  femto‐cells  and  relays. Performance of such dense/heterogeneous deployments may be greatly enhanced through the use of 
smart  association techniques,  coupled  with  adaptive  interference  management.   Unlike traditional cellular systems where association is predominantly based on maximizing signal quality between the base‐station and the user, a smart association scheme in a heterogeneous network should be based on several additional criteria such as aggressive load‐balancing, path‐loss minimization, or minimization of interference to other  links. Aggressive  load‐balancing (in particular) requires advanced  interference management, which can may be realized through (soft) resource partitioning, beam‐coordination or joint signal processing at the base‐stations.  Multi‐cell signal processing (or distributed MIMO) can be used  in  homogeneous  networks  as  well,  in  order  to  mitigate  inter‐cell  interference  without compromising  degrees  of  freedom  associated  with  the  transmit  signals.   In  this  tutorial,  we demonstrate how these techniques may be incorporated into the design of a cellular system, and the performance gains resulting from such a system design.