Challenges in LTE Network deployments 4G Long Term Evolution (LTE) technology is often touted as the magic bullet for operators worldwide to address the increase in data traffic on their capacity constrained mobile networks. As new technology the LTE promises significant advantages over the current 3G technology such as higher spectral efficiency, lower cost of data transmission, faster speeds and lower latencies. However, as with any new technology, there are several challenges ahead for global operators in deploying 4G LTE networks.
The key feature of LTE(OFDMA) to handle multipath propagation without complex receivers but high variations in the amplitude of signals reduces the efficiency of transmitter power amplifier, warranting high quality of installation and accuracy .The majority of the spectrum allocation is in 2.6GHZ in large part of the world which is required to be harmonized .
According to study in different countries, the biggest single problem faced by operators is the range of spectrum bands to support. The fragmentation is worse in other countries such as the USA, where within the same geography, telcos operate on different frequencies. Verizon and AT&T use the 700MHz band for their LTE networks while Sprint is using 1900MHz and 800MHz spectrum.A lower spectrum band (e.g. 1800MHz) provides better indoor signal strength and travels further compared to one of a higher spectrum band (e.g. 2600MHz). However, the higher spectrum bands are better suited for covering densely-populated areas and managing heavy data volumes due to their larger bandwidth.
Another challenge is how operators build up the network. Some carriers like to will build a completely new 4G network along the existing networks. Other telcos will create a converged network, where they try to make the different generations of technologies work together. In both cases, the process is highly complex and cost intensive. The transition to 4G network will require new radio access technology and core network expansion, while maintaining existing 2G/3G networks alongside the new 4G network will result in additional burden on telcos.
Need to create high capacity IP core network to connect MME(mobility management entity) ,S-GW,P-GW.EPC core network is to be dimensioned for high throughput and low latency for RAN. All the interworking nodes including non3GPP systems is to be re-dimensioned. There is a need to reduce Round trip delay which requires the operator to look into its legacy IP network