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SUMMARY:Random Caching Based Transmission in Ultra-Dense Wireless Networks
  - Prof. Fu-Chun Zheng\, Harbin Institute of Technology\, China
DTSTART:20191009T140000Z
DTEND:20191009T150000Z
UID:TALK132052@talks.cam.ac.uk
CONTACT:Prof. Ramji Venkataramanan
DESCRIPTION:Base station cooperation in ultra-dense (heterogeneous) networ
 ks (UDN) is a promising approach to improve the network performance\, but 
 it also poses a significant challenge for the backhaul. One effective way 
 to reduce backhaul loading in UDN is to cache some popular files at small 
 base stations (SBS). In the first part of this presentation\, we propose a
 n SBS cooperative transmission scheme under random caching at SBSs with th
 e caching distribution as a design parameter. Using some tools from stocha
 stic geometry\, a tractable expression for the successful transmission pro
 bability (STP) is derived and then optimised. Compared with some existing 
 caching designs\, the optimal random caching approach achieves an all-roun
 d better STP performance. In the second part of this presentation\, we con
 sider retransmission with random discontinuous transmission (DTX) in cache
 -enabled UDN. By analyzing the STP in the high-mobility and static scenari
 os\, closed-form expressions for the STP are established\, showing that (1
 ) a larger caching probability corresponds to a higher STP in both scenari
 os\; and (2) random DTX does improve the STP in the static scenario but it
 s benefit gradually diminishes when mobility increases.\n\n\n*BIO*:  Fu-Ch
 un Zheng obtained the BEng (1985) and MEng (1988) degrees in radio enginee
 ring from Harbin Institute of Technology\, China\, and the PhD degree （1
 992）in Electrical Engineering from the University of Edinburgh\, UK.  Fr
 om 1995 to 2007\, Dr Zheng was with Victoria University\, Melbourne\, Aust
 ralia\, as a lecturer and then an associate professor in mobile communicat
 ions. In 2007\, he became the Chair of Signal Processing at the University
  of Reading\, UK.  He has also been a distinguished adjunct professor with
  Southeast University\, China\, since 2010. He is currently with Harbin In
 stitute of Technology (Shenzhen)\, China and the University of York\, UK. 
 He has been awarded two prestigious UK EPSRC Visiting Fellowships - both h
 osted by the University of York (UK): first in 2002 and then again in 2006
 . \n\nOver the past two decades\, Dr Zheng has also carried out many gover
 nment and industry sponsored research projects - in Australia\, the UK\, a
 nd China. He has been both a short term visiting fellow and a long term vi
 siting research fellow with British Telecom\, UK. Dr Zheng’s current res
 earch interests include green communications\, ultra-dense networks and ma
 chine learning based resource allocation.\n\nDr Zheng has been an editor o
 r guest editor for several international journals such as IEEE Transaction
 s on Wireless Communications\, IEEE Communications Magazine\, and Science 
 China – Information Sciences. In 2006\, he served as the general chair o
 f IEEE VTC 2006-S (Melbourne\, Australia: www.ieeevtc.org/vtc2006spring) -
  the first ever VTC held in the southern hemisphere. More recently\, he wa
 s the executive TPC chair for IEEE VTC 2016-S (Nanjing\, China: www.ieeevt
 c.org/vtc2016spring) - the first ever VTC in mainland China. \n \n
LOCATION:LT6\, Baker Building\, CUED
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