Optimal Collaborative Spectrum Sharing for a Cognitive Multi-Antenna Relay With Full-Duplex Capability and Stability Constraint

Abstract

Collaborative spectrum sharing (CSS) between primary and secondary users (PU and SU) is an effective way of utilizing limited radio spectrum. In CSS, cognitive SU acts as a relay for PU, which facilitates the PU to send its packet with a lower error probability by the help of the SU, and consequently, the SU has more chances to find a vacant spectrum. When SU is equipped with multiple antennas, it can further efficiently utilize the radio spectrum by adopting a growing self-interference cancelation technique for full-duplex (FD) transmission. In this paper, both an aggressive and a passive secondary usage of the spectrum are proposed, the operational principles of which are defined using spectrum-sharing probability φ in FD CSS environments. For the spectrum-sharing probability φ, SU for each of the methods sends its own signal and the PU's (relayed) signal together by using superposition transmission. For the remaining probability 1 − φ, the two methods work differently: SU sends its own signal only in the aggressive mode while it sends only the relaying signal for PU in the passive mode. We formulate an FD CSS problem with various physical-layer parameters and the proposed operating modes as a function of the spectrum-sharing probability. Our goal is to maximize the secondary stable throughput while keeping a primary traffic constraint. Closed-form optimal solutions on φ are provided in the paper, the value of which heavily depends on the primary traffic volume, the operating modes, the relative locations of the collaborative nodes and the transmit power budget at SU. The analytical results in the paper are verified with numerical investigation, and the performance enhancement by the proposed methods is evaluated in comparison with benchmark systems. The results show that the aggressive mode is promising if SU has a relatively small transmit power and the primary traffic load is low, while the passive mode is suitable when the primary traffic load is high. INDEX TERMS Spectrum sharing, cognitive/collaborative mobile nodes, full-duplex capability, stability analysis.

Fundamental Limits of Full-Duplex Spectrum Sharing Under Peak Interference Power Constraint

“…In addition, there are also some works of CR combined with FD based on the spectrum sharing model [20][21][22][23][24][25][26][27][28][29][30][31][32][33]. In the FD spectrum sharing CR networks, in which is divided into two categories according to whether with the help of the relay.…”

“…In the FD spectrum sharing CR networks, in which is divided into two categories according to whether with the help of the relay. The current research focus is mainly on the FD spectrum sharing CR networks with relay assistance [20][21][22][23][24][25][26][27][28]. In the spectrum sharing CR networks, when considering FD relay to assist secondary user transmission, on the one hand, so increases the spectral efficiency and connectivity of the cognitive networks, but on the other hand, the relay also increases interference to the primary user.…”