Transmission mode switching for device-to-device communication aided by relay node

EURASIP Journal on Advances in Signal Processing, Sep 2014

In this paper, we investigate the strategy of transmission mode switching for device-to-device (D2D) communication in both single-cell scenario and multi-cell scenarios, which selects the transmission mode to guarantee the maximum ergodic achievable sum-rate among three transmission modes. We first introduce the basic operation principles of three communication transmission modes which are named as traditional cellular communication mode, direct D2D communication mode and two-way decode-and-forward (DF)-relayed D2D communication mode. Then we derive the corresponding expressions for the ergodic achievable sum-rates of each transmission mode, and get the crossing points of different transmission modes to attain maximum ergodic achievable sum-rate of the system. From the analytical results, we can see that the proper operating region of each transmission mode is related to different interference level and distance of the D2D users. Based on the analytical results, we obtain a reliable communication transmission mode switching strategy which guarantees the system to choose the mode with the maximum ergodic achievable sum-rate so as to improve the performance of D2D communication. Numerical results demonstrate that by applying mode switching, the ergodic achievable sum-rate of the system achieves a remarkable enhancement.

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Transmission mode switching for device-to-device communication aided by relay node

Yiyang Ni 0 Dan Qiao 1 Xiao Li 1 Shi Jin 1 Hongbo Zhu 0 0 Jiangsu Key Laboratory of Wireless Communications College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications , Nanjing 210003, China 1 National Mobile Communications Research Laboratory, Southeast University , Nanjing 210096, China In this paper, we investigate the strategy of transmission mode switching for device-to-device (D2D) communication in both single-cell scenario and multi-cell scenarios, which selects the transmission mode to guarantee the maximum ergodic achievable sum-rate among three transmission modes. We first introduce the basic operation principles of three communication transmission modes which are named as traditional cellular communication mode, direct D2D communication mode and two-way decode-and-forward (DF)-relayed D2D communication mode. Then we derive the corresponding expressions for the ergodic achievable sum-rates of each transmission mode, and get the crossing points of different transmission modes to attain maximum ergodic achievable sum-rate of the system. From the analytical results, we can see that the proper operating region of each transmission mode is related to different interference level and distance of the D2D users. Based on the analytical results, we obtain a reliable communication transmission mode switching strategy which guarantees the system to choose the mode with the maximum ergodic achievable sum-rate so as to improve the performance of D2D communication. Numerical results demonstrate that by applying mode switching, the ergodic achievable sum-rate of the system achieves a remarkable enhancement. 1 Introduction With the rapid increase of context-aware applications, online game and various innovative multi-media services, more spectral efficient communication techniques are required for future wireless networks [1]. Recently, deviceto-device (D2D) communication underlying cellular networks has attracted considerable attention due to its much improved spectral efficiency [2,3]. D2D communications commonly refer to the technologies that enable devices to communicate directly without an infrastructure of access points or base stations [4,5]. Despite the advantages D2D communication has, the inter-channel interference (ICI) between cellular and D2D links challenges the entire system performance, since the D2D link reuses the cellular frequency resource [6,7]. Several methods have been proposed to solve this problem, including transmission power control of D2D users [8] or cellular users [9], orthogonal or non-orthogonal resource allocation schemes [10,11], and so on. Meanwhile, relay-assisted communication has attracted lots of interests due to its great potential in enhancing the system performance [12]. Spectral efficient protocols for relay channels have been proposed including the two-way amplify-and-forward (AF), decode-and-forward (DF) and compress-and-forward (CF) relay protocols in [13,14]. The ergodic achievable rates have been studied for DF relaying system in [15,16]. A recent study [17] discussed the outage probability of the D2D communication aided by a two-way DF relay node for both the asymmetric and symmetric cases. The result shows that the new strategy gains advantages in outage probability over that of the traditional strategy without extra power. The authors in [18] proposed a joint precoded-and-decoder scheme in D2D communication system to mitigate interference and improve the error performance. In [19], the authors presented two coding-based relaying schemes for D2D communication system which can exploit the transmission opportunities for the D2D users. The outage behavior was investigated for the multi-hop one-way decode-and-forward relay-assisted D2D communication in [20]. The performance of achievable capacity for the relay-assisted D2D communication was studied in [21]. Wang [22] derived out the interference constrained criteria of employing the D2D communication with relayassisted mode based on the outage performance. A relay selection rule was deduced on the basis of constraining the interference in the permitted range which considers the achievable rate [23]. The communication transmission mode switching has always been an issue of great contention in wireless communication study [24-26]. A distributed mode selection algorithm switching between TDMA and SDMA was proposed in [24], where each user feeds back its preferred mode and the channel quality information. In [25], an SU/MU mode switching algorithm was proposed for the ZF precoding system considering delayed and quantized CSIT. The mode switching point can be explicitly derived based on the parameters including average SNR, normalized Doppler frequency, and codebook size, which are computable at base station (BS). In [26], the authors pointed out that different receiving modes can be exploited at D2D receivers according to the interference level, and proposed a new m (...truncated)


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Yiyang Ni, Dan Qiao, Xiao Li, Shi Jin, Hongbo Zhu. Transmission mode switching for device-to-device communication aided by relay node, EURASIP Journal on Advances in Signal Processing, 2014, pp. 138, Volume 2014, Issue 1, DOI: 10.1186/1687-6180-2014-138