Entries tagged as cellphone

Todayโ€™s โ€œThe Toon-Boxโ€

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Today's "The Toon-Box"

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Cellphone frequency in Korea: 1996 - 2000

On January 1, 1996, KMTC became the first company in the world to commercially operate the digital CDMA (2G) cellular service. Shinsegi Telecom(์‹ ์„ธ๊ธฐํ†ต์‹ ; STI) followed up with its own CDMA service on April 1 of the same year. The allocated frequencies were the same as AMPS, and existing AMPS service would be gradually transitioned to CDMA, as per Ministry of Information and Communication (์ •๋ณดํ†ต์‹ ๋ถ€; MIC) Notice No.1995-83(Jun. 15, 1995). AMPS network in Korea was shut down on December 31, 1999.

STI used the same 800MHz band that KMTC used for CDMA. This is because it was allocated a portion of the band originally used by KMTC: 835 - 845MHz uplink and 880 - 890MHz downlink for 10MHz each way. STI never offered AMPS and started its operation exclusively on CDMA.

Meanwhile, Korean government wanted a full-scale competitive telecommunication market, so it decided to introduce Personal Communications Service (PCS) based on the same CDMA technology used by cellular phones. Through MIC Notice No.1995-160(Oct. 30, 1995), the 1800MHz band (1750 - 1780MHz uplink, 1840 - 1870MHz downlink for 30MHz each) was allocated for this purpose.

As for the PCS carriers, three were selected on June 10, 1996: Korea Telecom Freetel (ํ•œ๊ตญํ†ต์‹ ํ”„๋ฆฌํ…”; KTF), Hansol PCS(ํ•œ์†”PCS), and LG Telecom (LGํ…”๋ ˆ์ฝค; LGT; currently LG Uplus). KTF and Hansol PCS were ultimately absorbed by KT later. As per MIC Notice No.1997-27(Feb. 21, 1997), the band was divided into A, B, and C bands, 10MHz each, and allocated A to KTF, B to Hansol PCS, and C to LG Telecom. Commercial PCS networks went online on October 1, 1997.

The shape of the industry was kept more or less like this until the year 2000, when a sea of changes like the selection of IMT-2000 operators and various mergers transformed the landscape. As a side note, dialing codes for each carriers were 011 for SK Telecom(KMTC), 017 for Shinsegi Telecom, 016 for KTF, 018 for Hansol PCS, and 019 for LG Telecom.

[Frequency Allotment 1996 - 2000]

CDMA (2G) - Cellular
SKT #1: Uplink 824 - 835MHz (11MHz) / Downlink 869 - 880MHz (11MHz)
SKT #2: Uplink 845 - 849MHz (4MHz) / Downlink 890 - 894MHz (4MHz)
STI: Uplink 835 - 845MHz (10MHz) / Downlink 880 - 890MHz (10MHz)

KTF: Uplink 1750 - 1760MHz (10MHz) / Downlink 1840 - 1850MHz (10MHz)
Hansol: Uplink 1760 - 1770MHz (10MHz) / Downlink 1850 - 1860MHz (10MHz)
LGT: Uplink 1770 - 1780MHz (10MHz) / Downlink 1860 - 1870MHz (10MHz)
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Cellphone frequency in Korea: 1984 - 1995

On December 10, 1981, South Korea's Ministry of Communications (์ฒด์‹ ๋ถ€) separated the telecommunication sector from itself to form a public corporation called Korea Telecom (ํ•œ๊ตญ์ „๊ธฐํ†ต์‹ ๊ณต์‚ฌ; currently KT Corporation) in order to modernize telecommunication service. And then, this company created a subsidiary called Korea Mobile Telecommunications Services Corporation (KMTSC; ํ•œ๊ตญ์ด๋™ํ†ต์‹ ์„œ๋น„์Šค(์ฃผ); currently SK Telecom) on March 29, 1984, to manage mobile telecommunication sector. In May of the same year, it started the "car phone" service based on the analog AMPS (1G) cellular phone technology around the Seoul metropolitan area. This marked the beginning of the mobile phone service in Korea.

The frequencies used at the time was 824 - 849MHz uplink and 869 - 894MHz downlink, which was 25MHz bandwidth each way. This is outlined in the Ministry of Communications Notice No.43 (May 9, 1991). KMTSC changed its name to Korea Mobile Telecommunications Corporation (KMTC; ํ•œ๊ตญ์ด๋™ํ†ต์‹ (์ฃผ)) as it was selected as a public common carrier on April 30, 1988. Nationwide AMPS network was set up by the end of 1991.

In 1994, a big restructuring effort was put into the telecommunications sector. In January, Sunkyong Group (์„ ๊ฒฝ๊ทธ๋ฃน; currently SK Group) took over KMTC and privatized it by purchasing 24% of its stocks. Shinsegi Telecom Inc.(์‹ ์„ธ๊ธฐํ†ต์‹ (์ฃผ); STI), which was selected to be the 2nd mobile carrier in Korea and had POSCO as its largest shareholder, was founded on May 2. This established the competitive market for mobile phone services.

Interestingly, Sunkyong Group was originally selected as the 2nd mobile carrier in 1992, but its CEO an in-law to the then-president Roh Tae-woo, sparking preferential treatment controversy. It relinquished the rights on August 27 of that year. It ended up entering the telecommunications market by buying up the 1st mobile carrier instead. KMTC changed its name to SK Telecom on March 1997 is called by that name to this day.

[Frequency Allotment 1984 - 1995]

KMTC: Uplink 824 - 849MHz / Downlink 869 - 894MHz
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