  Device-to-Device (D2D) communication is a technology component for LTE-A. The
existing researches allow D2D as an underlay to the cellular network to
increase the spectral efficiency. In this book, D2D communication underlaying
cellular networks is studied. Some physical-layer techniques and cross-layer
optimization methods on resource management and interference avoidance are
proposed and discussed. WINNER II channel models is applied to be the signal
and interference model and simulation results show that the performance of D2D
link is closely related to the distance between D2D transmitter and receiver
and that between interference source and the receiver. Besides, by power
control, D2D SINR degrades, which will naturally contribute to low interference
to cellular communication. A simple mode selection method of D2D communication
is introduced. Based on path-loss (PL) mode selection criterion, D2D gives
better performance than traditional cellular system. When D2D pair is farther
away from the BS, a better results can be obtained. Game theory, which offers a
wide variety of analytical tools to study the complex interactions of players
and predict their choices, can be used for power and radio resource management
in D2D communication. A reverse iterative combinatorial auction is formulated
as a mechanism to allocate the spectrum resources for D2D communications with
multiple user pairs sharing the same channel. In addition, a game theoretic
approach is developed to implement joint scheduling, power control and channel
allocation for D2D communication. Finally, joint power and spectrum resource
allocation method is studied under consideration of battery lifetime, which is
an important application of D2D communication on increasing user's energy
efficiency. The simulation results show that all these methods have beneficial
effects on improving the system performance.
