Coordinated Multi Point Transmission and Reception for Mixed-Delay Traffic

TL;DR

This paper investigates multiplexing gains in interference networks for mixed-delay traffic, showing that coordinated multipoint transmission can optimize delay-sensitive and delay-tolerant data transmission with minimal trade-offs.

Contribution

It characterizes multiplexing gains for mixed-delay traffic in Wyner's networks and establishes conditions where delay-sensitive data transmission is optimized without reducing overall network performance.

Findings

Maximized multiplexing gains for delay-sensitive data at high cooperation rates.

Achieved exact information-theoretic bounds for Wyner's linear network.

Demonstrated minimal impact on total multiplexing gain with sectorization in hexagonal networks.

Abstract

This paper analyzes the multiplexing gains (MG) for simultaneous transmission of delay-sensitive and delay-tolerant data over interference networks. In the considered model, only delay-tolerant data can profit from coordinated multipoint (CoMP) transmission or reception techniques, because delay-sensitive data has to be transmitted without further delay. Transmission of delay-tolerant data is also subject to a delay constraint, which is however less stringent than the one on delay-sensitive data. Different coding schemes are proposed, and the corresponding MG pairs for delay-sensitive and delay-tolerant data are characterized for Wyner's linear symmetric network and for Wyner's two-dimensional hexagonal network with and without sectorization. For Wyner's linear symmetric also an information-theoretic converse is established and shown to be exact whenever the cooperation rates are sufficiently large or the delay-sensitive MG is small or moderate. These results show that on Wyner's symmetric linear network and for sufficiently large cooperation rates, the largest MG for delay-sensitive data can be achieved without penalizing the maximum sum-MG of both delay-sensitive and delay-tolerant data. A similar conclusion holds for Wyner's hexagonal network only for the model with sectorization. In the model without sectorization, a penalty in sum-MG is incurred whenever one insists on a positive delay-sensitive MG.