Abstract
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.
Original language | English |
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Article number | 7831429 |
Journal | IEEE Transactions on Communications |
Volume | 65 |
Issue number | 4 |
Pages (from-to) | 1507-1517 |
Number of pages | 11 |
ISSN | 0090-6778 |
DOIs | |
Publication status | Published - 1 Apr 2017 |
Keywords
- protocols
- Radio communication
- relays