PERFORMANCE REQUIREMENTS OF 5G WIRELESS NETWORKS In 5G
three use case scenarios have been identified, which are enhanced mobile broadband (eMBB), mMTC and ultra-reliable and low-latency communications (URLLC) [64], [67]. Presently, various major performance requirements have been identified by different research initiatives for 5G wireless networks to ensure optimal performance of the use case scenarios. These requirements are summarised as follows:
• Higher Data Rate: Peak data rates of 10 Gbps (uplink) and 20 Gbps (downlink) are required in 5G wireless networks [67]. This amounts to 10-fold increase from the theoretical peak data rate of 150 Mbps of the existing LTE network [2], [13].
• Reduced Latency: Lower latency of less than 1 ms is required in 5G wireless networks. This amounts to 10× decrease from the 10 ms round trip time in the current 4G wireless networks [2].
• Higher Battery Life: 5G wireless systems will have a longer battery life (up to ten years) to support the emerging applications compared to the 4G wireless systems [13].
• Higher Bandwidth in Unit Area: 1000× higher bandwidth per unit area is required to facilitate a massive number of connected devices along with ultrahigh bandwidths for longer durations in a particular area [2], [13], [66].
• Massive Connectivity: There will be huge number of connected devices to accomplish the vision of D2D, M2M, and IoT technologies, it is essential for emerging 5G wireless networks to provide connectivity to billions of devices [2], [13], [49].
• 100% Network Availability: 5G envisages that network should be always available everywhere, and everytime in reality [2].
• 100% Coverage for Ubiquitous Connectivity: Complete coverage becomes indispensable irrespective of users’ locations in 5G wireless networks [2].
• Reduction in Energy Usage: 100-fold EE is expected in 5G. Development of green technology is already being considered by standardisation bodies to ensure significant reduction in devices’ energy consumption [2], [13], [49].
• Enhanced end-user QoE: QoE describes the subjective perception of each user as to how well an application or service is working. QoE is highly applicationand user-specific with an adequate level of reliability. It is required in 5G to provide end users with better experience and satisfaction in a wireless network [41], [68], [69].
• Higher Security: Higher security is another requirement that is very important in 5G for standardisation on authentication, authorisation and accounting [70].
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