TY - JOUR
T1 - Design of a Heterogeneous Cellular Network with a Wireless Backhaul
AU - Bande, Meghana
AU - Veeravalli, Venugopal V.
N1 - Funding Information:
Manuscript received February 9, 2020; revised June 27, 2020; accepted September 8, 2020. Date of publication September 22, 2020; date of current version January 8, 2021. This work was supported in part by the U.S. NSF WIFiUS Program under Grant CNS 14-57168 and in part by the U.S. NSF SpecEES through the University of Illinois at Urbana–Champaign under Grant 1730882. This article was presented in part at the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2017, in part at the 26th International Conference on Computer Communication and Networks (ICCCN), 2017, and in part at the 10th International Conference on Communication Systems Networks (COMSNETS), January 2018. The associate editor coordinating the review of this article and approving it for publication was D. W. K. Ng. (Corresponding author: Venugopal V. Veeravalli.) Meghana Bande was with the Coordinated Science Laboratory, University of Illinois at Urbana–Champaign, Champaign, IL 61801 USA, and also with the Department of Electrical and Computer Engineering, University of Illinois at Urbana–Champaign, Champaign, IL 61801 USA. She is now with Qualcomm Technologies Inc., Bridgewater, NJ 08807 USA (e-mail: mbande@qti.qualcomm.com).
Publisher Copyright:
© 2002-2012 IEEE.
PY - 2021/1
Y1 - 2021/1
N2 - The downlink of a two-layered heterogeneous network is studied with macro basestations (MBs), small-cell basestations (SBs) that act as half-duplex analog relays, and mobile terminals (MTs). The first layer is a wireless backhaul layer between MBs and SBs, and the second is the transmission layer between SBs and MTs. The layers use the same time/frequency resources for communication, limiting the maximum per user degrees of freedom (puDoF) to half, due to the half-duplex nature of the SBs. For linear network models, it is established that the optimal puDoF can be achieved by cooperation with an appropriate number of antennas that depends on the connectivity of the network. The proposed zero-forcing schemes achieve cooperation without overloading the backhaul, through each MB sending an appropriate linear combination of MTs' message signals to the SBs in the backhaul layer. The achievable schemes exploit the half-duplexity of the SBs, and schedule the SBs and MTs to be active in different time-slots to manage interference. These results are then extended to a more realistic hexagonal cellular network and it is shown that the optimal puDoF of half can be approached using only zero-forcing schemes.
AB - The downlink of a two-layered heterogeneous network is studied with macro basestations (MBs), small-cell basestations (SBs) that act as half-duplex analog relays, and mobile terminals (MTs). The first layer is a wireless backhaul layer between MBs and SBs, and the second is the transmission layer between SBs and MTs. The layers use the same time/frequency resources for communication, limiting the maximum per user degrees of freedom (puDoF) to half, due to the half-duplex nature of the SBs. For linear network models, it is established that the optimal puDoF can be achieved by cooperation with an appropriate number of antennas that depends on the connectivity of the network. The proposed zero-forcing schemes achieve cooperation without overloading the backhaul, through each MB sending an appropriate linear combination of MTs' message signals to the SBs in the backhaul layer. The achievable schemes exploit the half-duplexity of the SBs, and schedule the SBs and MTs to be active in different time-slots to manage interference. These results are then extended to a more realistic hexagonal cellular network and it is shown that the optimal puDoF of half can be approached using only zero-forcing schemes.
KW - Interference management
KW - coordinated multipoint transmission (CoMP)
KW - half-duplex relays
KW - heterogeneous networks
KW - interference avoidance
UR - http://www.scopus.com/inward/record.url?scp=85099516926&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85099516926&partnerID=8YFLogxK
U2 - 10.1109/TWC.2020.3024272
DO - 10.1109/TWC.2020.3024272
M3 - Article
AN - SCOPUS:85099516926
SN - 1536-1276
VL - 20
SP - 243
EP - 253
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 1
M1 - 9204434
ER -