TY - JOUR
T1 - Decoupled Uplink and Downlink in a Wireless System with Buffer-Aided Relaying
AU - Liu, Rongkuan
AU - Popovski, Petar
AU - Wang, Gang
PY - 2017/4/1
Y1 - 2017/4/1
N2 - This paper treats a multiuser relay scenario, where multiple user equipments have a two-way communication with a common base station in the presence of a buffer-equipped relay station. Each of the uplink (UL) and downlink (DL) transmission can take place over a direct or over a relayed path. Traditionally, the UL and the DL path of a given two-way link are coupled, that is, either both are direct links or both are relayed links. By removing the restriction for coupling, one opens the design space for a decoupled two-way links. Following this, we devise two protocols: orthogonal decoupled UL/DL buffer-aided (ODBA) relaying protocol and non-ODBA (NODBA) relaying protocol. In NODBA, the receiver can use successive interference cancellation to extract the desired signal from a collision between UL and DL signals. For both protocols, we characterize the transmission decision policies in terms of maximization of the average two-way sum rate of the system. The numerical results show that decoupling association and non-orthogonal radio access lead to significant throughput gains for two-way traffic.
AB - This paper treats a multiuser relay scenario, where multiple user equipments have a two-way communication with a common base station in the presence of a buffer-equipped relay station. Each of the uplink (UL) and downlink (DL) transmission can take place over a direct or over a relayed path. Traditionally, the UL and the DL path of a given two-way link are coupled, that is, either both are direct links or both are relayed links. By removing the restriction for coupling, one opens the design space for a decoupled two-way links. Following this, we devise two protocols: orthogonal decoupled UL/DL buffer-aided (ODBA) relaying protocol and non-ODBA (NODBA) relaying protocol. In NODBA, the receiver can use successive interference cancellation to extract the desired signal from a collision between UL and DL signals. For both protocols, we characterize the transmission decision policies in terms of maximization of the average two-way sum rate of the system. The numerical results show that decoupling association and non-orthogonal radio access lead to significant throughput gains for two-way traffic.
KW - protocols
KW - Radio communication
KW - relays
UR - http://www.scopus.com/inward/record.url?scp=85019061846&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2017.2657515
DO - 10.1109/TCOMM.2017.2657515
M3 - Journal article
AN - SCOPUS:85019061846
SN - 0090-6778
VL - 65
SP - 1507
EP - 1517
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 4
M1 - 7831429
ER -