SK Telecom is currently experiencing a daily average of 60,000 customers new LTE enrollments, representing over 50 percent growth compared to the last month. LTE subscribers surpassed 7 million as of December 12, 2012, thereby achieving the end of year target for LTE subscribers. The company’s LTE footprint covers 99 percent of South Korea’s population.
For comparison, it took SK Telecom two years and four months to acquire 7 million 3G WCDMA subscribers since commercializing the service in May 2006.
At present, the company’s LTE subscribers make up 26 percent of its total mobile subscriber base, expanding 11 fold compared to the end of November 2011 when it reported 630,000 LTE subscribers, accounting for a mere 2.4 percent of the total. The pace is expected to accelerate even further with the launch of Apple’s iPhone 5 on December 7, 2012.
The LTE subscriber base is expected to hit 14 million by the end of 2013. making LTE the company’s mainstream mobile service.
“As LTE is expected to become the mainstream service in 2013, we will focus on developing and offering differentiated LTE services to deliver greater value and convenience for our customers,” stated Jang Dong-hyun, Executive Vice President and Head of Marketing Division of SK Telecom.
- The premium HD voice service is available at no additional charge.
- The HD voice connection uses 2.2 times the bandwidth of voice over 3G.
- The HD voice call connection time ranges from less than 0.25 to 2.5 seconds. This compares with a mean call connection time of 5 seconds for 3G voice calls, and SK Telecom believes this difference will be apparent to the customer.
- HD VoLTE carries a wide voice frequency range of 50 to 7000 hertz compared to a 3G voice call that typically covers 300 to 2400 hertz. The service uses Enhanced Variable Rate Codec (EVRC).
- SK Telecom is using multi-carrier technology for the 800 MHz (20MHz) and 1.8 GHz (20MHz) frequency bands.
SK Telecom, in collaboration with Qualcomm and Nokia Siemens Networks, recently tested a core LTE-Advanced technology called ‘Enhanced Inter-Cell Interference Coordination (eICIC) that coordinates signal interference between macro and pico base stations. eICIC is gaining importance as more and more micro base stations are being built in traffic concentrated areas to accommodate explosive data traffic growth, thereby aggravating inter-cell interference.
SK Telecom noted that it now holds the record of demonstrating the three core technologies needed to usher in the era of LTE-Advanced: eICIC, Coordinated Multi-Point (CoMP) and Carrier Aggregation (CA). The company successfully demonstrated CoMP at Mobile World Congress (MWC) 2011 and CA at MWC 2012.
CoMP is a technology that prevents base station interference and abrupt call disconnections in coverage boundary areas by enhancing signal strength, the lack of which leads to a significant drop in data transmission speed, and CA is a technology that provides twice or faster data rates by utilizing multiple frequency bands at the same time.
SK Telecom expects to commercialize eICIC in the second half of 2013 to control signal interference and effectively offload data in downtown areas that experience heavy data traffic so as to provide customers with a mobile data service with greater speed and stability.
The company commercialized CoMP, for the first time in the world, in January 2012, after adjusting the technology to suit the current LTE system, and plans to achieve early commercialization of CA in the second half of 2013.
The operator will deliver LTE using both existing 800MHz frequency band (20MHz) and the 1.8GHz band (20MHz) it newly acquired last year. With an additional 20MHz uplink/downlink spectrum, it is now using a total of 40MHz for its LTE services. SK Telecom has launched a pilot service for multi-carrier in May 2012 and began full-fledged commercialization on July 1 to ensure a more stable and faster LTE service based on twice wider frequency bandwidth than its competitors. CA realizes data rates of up to 150Mbps by combining the speeds of 800MHz (75Mbps) and 1.8GHz (75Mbps) frequency bands.