Abstract
This paper focuses on edge-enabled cloud radio access network architecture to achieve ultra-reliable communication, a crucial enabler for supporting mission-critical machine-type communication networks. We propose coordinated multi-point transmission schemes taking advantage of diversity mechanisms in interference-limited downlink cellular networks. The network scenario comprises spatially distributed multiple remote radio heads (RRHs) that may cooperate through silencing, or by using more elaborated diversity strategies such as maximum ratio transmission or transmit antenna selection to serve user equipment in the ultra-reliable operation regime. We derive an exact closed-form expression for the outage probabilities and expected values of signal-to-interference ratio for silencing, transmit antenna selection and maximum ratio transmission schemes. We formulate rate control and energy efficiency under reliability constraints to test the performance and resource usage of the proposed schemes. Furthermore, we study the impact on average system sum throughput with throughput-reliability trade-off under cooperative communication. Extensive numerical analysis shows the feasibility of ultra-reliable communication by implementing diversity schemes with RRHs cooperation.
Highlights
Fifth-generation (5G) and beyond networks will have multi-service communication.These multi-services are about higher data rate applications such as enhanced mobile broadband but are designed to serve machine type communication (MTC) [1]
We studied the performance of the three diversity schemes: silencing, transmit antenna selection (TAS) with silencing, and maximum ratio transmission (MRT) for transmission in a downlink cellular system to ensure ultra-reliable communication via cloud radio access network (CRAN)
The analysis showed that performance depends on the transmit rate, distance to the user equipment (UE), path loss exponent, and the number of cooperating and interfering remote radio heads (RRHs)
Summary
Fifth-generation (5G) and beyond networks will have multi-service communication. These multi-services are about higher data rate applications such as enhanced mobile broadband (eMBB) but are designed to serve machine type communication (MTC) [1]. Multi-connectivity adopts spatial diversity with the concept of cloud radio access network (CRAN) to ensure ultra-reliability through cooperative solutions [13]. Motivated by the above concerns, the aim of this paper is to achieve ultra-reliable region operation through interference management by the cooperation/coordination of RRH for downlink transmission through CRAN using multiple spatially distributed RRH connections. This kind of framework with edge-enabled multi-coordinated transmission schemes is beneficial, for example, in an industrial environment where various types of devices are present such as robots, AGV, sensors, and actuator devices which rely on URC [17].
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