Performance Analysis of Pair-wise Dynamic Multi-User Joint Transmission
Jeonghun Park, Namyoon Lee, and R. W. Heath, Jr.
to appear in Proc. of the IEEE Int. Conf. on Communications, London, UK, June 8-12, 2015.
This paper characterizes the performance of multi-user joint transmission (MU-JT) with pair-wise dynamic base station (BS) clustering. For analyzing the performance of such BS cooperation method, a tractable model is presented by means of stochastic geometry. Using tools of stochastic geometry, a tight lower bound of the instantaneous signal-to-interference ratio (SIR) distribution is derived in a closed form in terms of relevant system parameters: the path-loss exponent and the topologies of users in the BS cooperative region. Our key finding is that the pair-wise dynamic BS cooperation through MU-JT provides a better rate coverage performance than that of single-user joint transmission (SU-JT) over the entire range of the rate threshold when each user is close enough to the associated BS. Through simulations, the exactness of the derived analytical expression is verified.