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)