TY - GEN
T1 - Cooperative transmissions in ultra-dense networks under a bounded dual-slope path loss model
AU - Yang, Yanpeng
AU - Sung, Ki Won
AU - Park, Jihong
AU - Kim, Seong Lyun
AU - Kim, Kwang Soon
PY - 2017/7/13
Y1 - 2017/7/13
N2 - In an ultra-dense network (UDN) where there are more base stations (BSs) than active users, it is possible that many BSs are instantaneously left idle. Thus, how to utilize these dormant BSs by means of cooperative transmission is an interesting question. In this paper, we investigate the performance of a UDN with two types of cooperation schemes: Non-coherent joint transmission (JT) without channel state information (CSI) and coherent JT with full CSI knowledge. We consider a bounded dual-slope path loss model to describe UDN environments where a user has several BSs in the near-field and the rest in the far-field. Numerical results show that non-coherent JT cannot improve the user spectral efficiency (SE) due to the simultaneous increment in signal and interference powers. For coherent JT, the achievable SE gain depends on the range of near-field, the relative densities of BSs and users, and the CSI accuracy. Finally, we assess the energy efficiency (EE) of cooperation in UDN. Despite costing extra energy consumption, cooperation can still improve EE under certain conditions.
AB - In an ultra-dense network (UDN) where there are more base stations (BSs) than active users, it is possible that many BSs are instantaneously left idle. Thus, how to utilize these dormant BSs by means of cooperative transmission is an interesting question. In this paper, we investigate the performance of a UDN with two types of cooperation schemes: Non-coherent joint transmission (JT) without channel state information (CSI) and coherent JT with full CSI knowledge. We consider a bounded dual-slope path loss model to describe UDN environments where a user has several BSs in the near-field and the rest in the far-field. Numerical results show that non-coherent JT cannot improve the user spectral efficiency (SE) due to the simultaneous increment in signal and interference powers. For coherent JT, the achievable SE gain depends on the range of near-field, the relative densities of BSs and users, and the CSI accuracy. Finally, we assess the energy efficiency (EE) of cooperation in UDN. Despite costing extra energy consumption, cooperation can still improve EE under certain conditions.
UR - http://www.scopus.com/inward/record.url?scp=85039946526&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85039946526&partnerID=8YFLogxK
U2 - 10.1109/EuCNC.2017.7980732
DO - 10.1109/EuCNC.2017.7980732
M3 - Conference contribution
AN - SCOPUS:85039946526
T3 - EuCNC 2017 - European Conference on Networks and Communications
BT - EuCNC 2017 - European Conference on Networks and Communications
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2017 European Conference on Networks and Communications, EuCNC 2017
Y2 - 12 June 2017 through 15 June 2017
ER -