Suggest one Essay Example | Topics and Well Written Essays - 750 words

Suggest one - Essay Example The challenges such that LTE devices faces are called VoWLAN. These include the quality of service security challenges. The paper will also discuss various Cloud-RAN technologies which have been applied to solve these issues. LTE ISSUES There are three key issues that the devices using LTE technology faces. These include packet loss, delay, jitter and the issues with the original wireless security standards. Packet loss It has been realized that the number of packets that reaches the destination is always less that the number of packets that were sent. This implies that some packets are lost along the network. The loss are attributed to two major ways. The first is through network packet loss as a result of overflow in the router buffer, transmission error, rerouting and link failures. The other packet loss is as a result of excessive delay (Guan Kolding, & Merz 2010). Delay The time that packets take from the source to the destination is a critical factor. The delay originates from different points such as at the receiver, at the network or at the source. The delay that occurring in either the source or the receiver result from coding such at the transformation of a signal from digital to analogue or from analogue to digital (Lorca & Cucala 2013). The delay also accrues as a result of packetization while the transmission, propagation or queuing causes network delay Jitter Jitter is the difference in the time taken by a packet to reach the destination. This issue is very common and the only way to handle it is to use a jet-buffer that contains both dynamic software base and the hardware. However, the implementation of jet-buffer should be done with intense care as it can cause other delays such as memory over-flows (Fletcher, 2009). Initial IEEE 802.11 MAC layer The original MAC layer used by IEEE 802.11 does not incorporate applications to support voice data especially its sensitivity to delay jitter. This is because the ordinary MAC layer utilizes DCF and PCF to allocate the medium. DCT depends on Carrier Sense Multiple Access with collision avoidance. This property as far as sharing the medium among station is optional in 802.11 RTS/CTS. The issue with DCF is the delay since the packets will wait until the medium is free in case there is a collision. Such an incident causes delay since the bandwidth is wasted. This is basically because of absence of Quality of service priority and guarantee for traffic such as data and voice. In addition, when a node detects that the medium is free and start to communicate; all the others have to wait until the communicating node frees the medium (Guan, Kolding, & Merz, 2010). PCF is mostly prominent in LTE since it is optional and only uses the infrastructure setups which are linked by a single access point. Cloud –RAN capabilities With the rising need for high data speed, the existing technologies and infrastructure can no longer provide the required performance at a cost effective level. The current radio access network should be very flexible and able to support various technological standards. It should also be cost effective and simple to upgrade. Cloud-RAN has proved to be the solution to all the issues in the LTE (Chang 2013). Cloud-RAN is a modern RAN topology that solves the issues present in the previous technologies. In C-RAN configuration, the baseband processing units are concentrated in a single base