|
|
1. GSM
GSMÀº 1928³âºÎÅÍ °³¹ßµÇ±â ½ÃÀÛÇßÀ¸¸ç ÃÖÃÊÀÇ GSM(Group Special Mobile)Àº CEPT(Conference of
European Posts and Telegraph)°¡ ±¸¼ºÇÑ °³¹ß ±×·ìÀÇ ¸íĪÀ̾ú´Ù. GSMÀº ¹üÀ¯·´¿¡¼ »ç¿ë °¡´ÉÇÑ 900MHz ´ë¿ª¿¡¼ ¿î¿ëµÇ´Â
¼¿·ê¶ó ½Ã½ºÅÛÀ¸·Î Ư¡Àº ¾Æ·¡¿Í °°´Ù.
- ³ôÀº À½¼º Ç°Áú
- Àú·ÅÇÑ ¼ºñ½º ºñ¿ë
- International Roaming Áö¿ø
- ÁÖÆļö ´ë¿ª »ç¿ë È¿À² Çâ»ó
- ISDN ȣȯ
GSMÀº ETSI(European Telecommunication Standards Institute)°¡ 1989³â¿¡ ½ÂÀÎÇÏ¿© ÀÌÈÄ Å©°Ô »ó¿ëÈ
µÇ¾ú´Ù. GSMÀº MS(Mobile Station), BSS(Base Station Subsystem), NSS(Network &
Switching Subsystem), OSS(Operation Subsystem)À¸·Î ±¸¼ºµÈ´Ù.
1) MS´Â ´Ü¸»±â¿Í SIM(Subscriber Identity Module)·Î ±¸¼ºµÇ¸ç SIM¿¡´Â °¡ÀÔÀÚ Á¤º¸°¡ ÀúÀåµÇ¾î ÀÖ´Ù. SIMÀ» ÀÌ¿ëÇϸé
ÀÚ½ÅÀÇ ´Ü¸»±â°¡ ¾Æ´Ï´õ¶óµµ ÅëÈ°¡ °¡´ÉÇÏ°Ô µÈ´Ù.
2) BSS´Â BSC(Base Station Controller)¿Í BTS(Base Transceiver System)À¸·Î ±¸¼ºµÇ¸ç NSS¿¡ ¿¬°áµÈ´Ù.
3) NSS´Â MSC(Mobile Switching Center)¿Í HLR(Home Location Register), VLR(Visitor
Location Register)·Î ±¸¼ºµÇ¸ç °¡ÀÔÀÚÀÇ Åëȸ¦ À§ÇÑ ´ëºÎºÐÀÇ ±â´ÉÀ» ¼öÇàÇÑ´Ù. HLR°ú VLRÀº ¸ðµÎ µ¥ÀÌŸ º£À̽ºÀÌÁö¸¸ HLRÀº
Ȩ±³È¯±¹ÀÇ °¡ÀÔÀÚ¿ëÀÌ°í VLRÀº Ÿ±³È¯±¹ÀÇ Àӽà ¹æ¹® °¡ÀÔÀÚ¿ëÀ̶ó´Â Á¡¿¡¼ ´Ù¸£´Ù.
4) OSSÀÇ ±â´ÉÀº Network Operation and Maintenance, Subscription Management,
Charging and Billing Management·Î ¿ä¾àµÈ´Ù.
GSMÀº TDMA ¹æ½ÄÀ» »ç¿ëÇϸç Åëȸ¦ Time Slot ´ÜÀ§·Î ºÐ¸®ÇÑ´Ù. GSM ÇÑ Ã¤³ÎÀº 200KHzÀÇ ´ë¿ªÆøÀ» °¡Áö¸ç 8°³ÀÇ Time
SlotÀ¸·Î ºÐÇҵȴÙ. GSMÀ» Upbanded½ÃŲ PCNÀº DCS1800À¸·Î ºÒ¸®±âµµ Çϸç 1800MHz ´ë¿ª¿¡¼ ¿î¿ëµÈ´Ù. ±âº»ÀûÀ¸·Î´Â
GSM¹æ½Ä¿¡ ±âÃÊÇÏ°í ÀÖÀ¸¸ç DCS1800°ú ÇÁ·ÎÅäÄÝÀº °°Áö¸¸ ¿î¿ë ÁÖÆļö ´ë¿ª¸¸ ´Ù¸¥ DCS1900µµ ÀÖ´Ù. DCS1800µµ SIMÀ» »ç¿ëÇϹǷÎ
ÀÌ·ÐÀûÀ¸·Î´Â GSM°ú ·Î¹ÖÀÌ °¡´ÉÇÏ´Ù.
PCN°ú GSM ¸ðµÎ ´Ü¹® ¼ö½Å ±â´É(SMS)°ú SMS¸¦ ÀÀ¿ëÇÑ OTA, CBC(Cell Broadcasting), µ¥ÀÌŸ Àü¼Û°ú ÀÎÅÍ³Ý Á¢¼ÓÀ»
À§ÇÑ µ¥ÀÌŸ ¼ºñ½º ±â´ÉµîÀ» Áö¿øÇÑ´Ù.
GSM¿¡¼´Â Frequency Hopping ¹æ½ÄÀÌ »ç¿ëµÇ¹Ç·Î µµÃ»ÀÌ ¸Å¿ì ¾î·Æ°í »ç¾÷ÀÚ´Â °¢ °¡ÀÔÀÚº°·Î º¸¾È µî±ÞÀ» ¼³Á¤ÇÒ ¼ö ÀÖ´Ù. GSMÀÇ
À½¼º ¾ÐÃà ±â¼ú Ư¼º»ó Round Trip Delay°¡ Á¸ÀçÇϴµ¥ ¾à 100msÁ¤µµÀÇ Áö¿¬ Çö»óÀÌ ¹ß»ýÇÑ´Ù. ÀÌ·¯ÇÑ Áö¿¬ Çö»óÀº »ç¿ëÀÚ°¡ ÀÎÁöÇÒ
¸¸Å ½É°¢ÇÏÁö´Â ¾ÊÁö¸¸ Å©°Ô ¸»ÇÒ¼ö·Ï Áö¿¬ÀÌ ¸¹ÀÌ »ý±æ °¡´É¼ºÀÌ ÀÖ´Ù.(¾à 200ms) ¶ÇÇÑ TDMAÀÇ Æ¯¼º»ó Multipath¿¡ ÀÇÇÑ
Phase CancellationÀº FadingÀ» ¹ß»ý½ÃÅ°°í Signal Power¸¦ ³·ÃãÀ¸·Î Çؼ ½ÅÈ£ Ç°ÁúÀÇ ÀúÇϸ¦ °¡Á®¿Ã ¼ö ÀÖ´Ù.
1. µðÁöÅÐÈ
µðÁöƲ ½ÅÈ£¶õ ½ÅÈ£ÀÇ Å©±â°¡ ¿¬¼ÓÀûÀÎ °ªÀ» °¡ÁöÁö ¾Ê°í '0'°ú '1'¸¸ °¡Áö´Â ½ÅÈ£¸¦ ¸»ÇÑ´Ù. ÀÌ·¯ÇÑ µðÁöƲ ½ÅÈ£´Â '0'°ú '1'¸¸ ±¸º°Çϸé
µÇ¹Ç·Î ½ÅÈ£Àü¼Û¿¡ ÀÖ¾î¼ ÀâÀ½¿¡ °ÇÑ Æ¯¼ºÀ» º¸ÀδÙ. ¾Æ³¯·Î±× ½ÅÈ£´Â »ùÇøµ°ú ¾çÀÚÈ °úÁ¤À» °ÅÄ¡¸é µðÁöƲ ½ÅÈ£·Î º¯È¯ÇÒ ¼ö Àִµ¥ À½¼º½ÅÈ£¸¦
µðÁöƲ ½ÅÈ£·Î º¯È¯ÇÑ ´ëÇ¥ÀûÀÎ ¿¹°¡ PCM(Pulse Code Modulation)ÀÌ´Ù. PCMÀº À½¼º½ÅÈ£¸¦ 1ÃÊ¿¡ 8000¹ø »ùÇøµÇÏ¿© °¢ »ùÇøµÇÑ
°ªÀ» 8bitÀÇ µðÁöƲ ½ÅÈ£·Î º¯È¯, 64kbps µðÁöƲ ½ÅÈ£·Î ¸¸µç °ÍÀÌ´Ù.
¾Æ³¯·Î±× ½ÅÈ£¸¦ µðÁöÆ²È Çϱâ À§Çؼ´Â ÀÏÁ¤ÇÑ °£°ÝÀ¸·Î »ùÇøµÀ» ÇØ¾ß ÇÑ´Ù. ÀÌ·¯ÇÑ »ùÇøµ °£°ÝÀº ¾Æ³¯·Î±× ½ÅÈ£ÀÇ ´ë¿ªÆø¿¡ µû¶ó °áÁ¤µÈ´Ù. ¾Æ³¯·Î±×
½ÅÈ£ÀÇ ´ë¿ªÆø°ú »ùÇøµ ¼Óµµ¿ÍÀÇ °ü°è¸¦ ³ªÀÌÄû½ºÆ®(Nyquist) »ùÇøµ ÁÖÆļö¶ó ÇÏ¿© ¾Æ³¯·Î±× ½ÅÈ£ ÁÖÆļö ´ë¿ªÆøÀÇ µÎ ¹è°¡ µÇ´Â ÁÖÆļö·Î,
ÀÌ ÁÖÆļöº¸´Ù ´õ ³ôÀº ¼Óµµ·Î »ùÇøµÀ» ÇØ¾ß ¿ø·¡ÀÇ ¾Æ³¯·Î±× ½ÅÈ£¸¦ º¹±¸ÇÒ ¼ö ÀÖ´Ù. À½¼º½ÅÈ£ÀÇ °æ¿ì ½ÅÈ£´ë¿ªÀÌ 300 ~ 3400HzÀ̹ǷÎ,
À̸¦ 4000Hz±îÁö·Î º¸°í 4000HzÀÇ µÎ ¹èÀÎ 8000Hz·Î »ùÇøµ ÇÏ¸é ¿ø·¡ ¾Æ³¯·Î±× ½ÅÈ£ Á¤º¸¸¦ ÀÒ¾î¹ö¸®Áö ¾Ê°í »ùÇøµÇÒ ¼ö ÀÖ´Â °ÍÀÌ´Ù.
»ùÇøµµÈ ½ÅÈ£¸¦ ¾çÀÚÈ °úÁ¤À» °ÅÄ£ ÈÄ µðÁöƲ ½ÅÈ£·Î ¸¸µé¸é ¿ø·¡ÀÇ ½ÅÈ£º¸´Ù ÈξÀ ³ÐÀº ´ë¿ªÆøÀ» °¡Áö´Â µðÁöƲ ½ÅÈ£°¡ µÈ´Ù.(¿¹¸¦ µé¾î À½¼º½ÅÈ£
´ë¿ªÆøÀº 300 ~ 3400HzÀÌÁö¸¸ PCM ½ÅÈ£ÀÎ µðÁöÆ²ÈµÈ À½¼º½ÅÈ£´Â ÃÖ¼Ò 64kHz ÀÌ»óÀÇ ´ë¿ªÆøÀ» °¡Áø´Ù.) ÀÌ¿Í °°ÀÌ µðÁöƲ ½ÅÈ£´Â ÁÖÆļö
´ë¿ª¸¸ »ìÆ캸¸é È¿À²ÀÌ ¶³¾îÁöÁö¸¸ Àü¼ÛÀ̳ª º¸°ü½Ã µ¥ÀÌÅÍ°¡ ÀâÀ½¿¡ °ÇÏ°í µðÁöƲ ½ÅÈ£¸¦ ó¸®ÇÏ´Â ±â¼ú(µ¥ÀÌÅÍ ¾ÐÃà, ÇÊÅ͸µ µî)ÀÌ ¹ß´ÞÇÔ¿¡ µû¶ó¼
Á¡Á¡ ´õ ÀûÀº ºñÆ®¼ö¸¦ °¡Áö°í À½¼º½ÅÈ£¸¦ Àç»ýÇÒ ¼ö ÀÖ´Ù. À½¼º½ÅÈ£ÀÇ °æ¿ì PCMÀº 64kbpsÀÌÁö¸¸ À̸¦ ¾ÐÃàÇϸé 8kbps ÀÌÇϷεµ µ¥ÀÌÅÍ
¾çÀ» ÁÙÀϼö ÀÖ´Ù. ÀÌ¿Í °°Àº ±â¼úÀ» ÀÌ¿ëÇÏ¿© À̵¿Åë½Å¿¡¼ ¹«¼±±¸°£ Àü¼Û¿¡ µðÁöƲ ¹æ½ÄÀ» »ç¿ëÇÏ´Â °ÍÀÌ´Ù. ÀÌ·¯ÇÑ µ¥ÀÌÅÍ ¾ÐÃà±â¼úÀÌ ¾ø¾ú´Ù¸é
PCM ½ÅÈ£ÀÎ 64kbpsÀÇ ¼Óµµ¸¦ °¡Áø ½ÅÈ£¸¦ ¹«¼±Á¢¼Ó ¹æ½Ä¿¡ Àû¿ëÇϱâ´Â ÁÖÆļö È¿À²ÀÌ ³Ê¹« ³·¾Æ¼ ¸Å¿ì °ï¶õÇßÀ» °ÍÀÌ´Ù.
2. TDMAÀÇ ±âº» ÀÌ·Ð
ÀÌ·¯ÇÑ µðÁöƲ ½ÅÈ£ ¿©·¯ °³¸¦ µ¿½Ã¿¡ Àü¼ÛÇÏ´Â ¹æ¹ýÀ¸·Î ÀÌ¹Ì TDM(Time Division Multiplex) ¹æ½ÄÀÌ »ç¿ëµÇ°í ÀÖ´Ù. ÀÌ
TDM ¹æ½Ä°ú °°Àº °³³äÀ» Àû¿ëÇÑ °ÍÀÌ TDMA ±â¼úÀÌ´Ù, ÀÌ´Â Á¤ÇØÁø ÁÖÆļö ´ë¿ª(´ë°³ FDMA ¹æ½ÄÀÇ Ã¤³Î ´ë¿ªº¸´Ù ÈξÀ ³Ð´Ù.)À» ÁÖ±âÀûÀ¸·Î
ÀÏÁ¤ÇÑ ½Ã°£°£°ÝÀ¸·Î ³ª´©¾î¼ °¢ »ç¿ëÀÚ°¡ Â÷·Ê´ë·Î Àڱ⿡°Ô ÇÒ´çµÈ ½Ã°£µ¿¾È ÀÚ±â½ÅÈ£¸¦ Àü¼ÛÇÏ´Â °ÍÀÌ´Ù. ¼ö½ÅÇÏ´Â ÂÊ¿¡¼´Â ¿ª½Ã ÀÚ±â½Ã°£¿¡ ÇØ´çÇÏ´Â
µ¿¾È¸¸ ¼ö½ÅÁ¤º¸¸¦ ¼öÁýÇÏ´Â ¹æ½ÄÀÌ´Ù. ÀÌ·¯ÇÑ ½Ã°£ °£°ÝÀ» ŸÀÓ½½·Ô(time slot)À̶ó Çϸç ÀÚ±â Á¤º¸¸¦ ¼ö½ÅÇϱâ À§ÇÏ¿© ŸÀÓ °ÔÀÌÆ®(Time
Gate) ¸¦ »ç¿ëÇÑ´Ù. Áï ¾î¶² Àü¼Ûä³Î¿¡ º¸³¾ ¼ö ÀÖ´Â ÃÑ µ¥ÀÌÅÍ ¼Óµµ°¡ 100kbps¶ó¸é À½¼º½ÅÈ£ÀÇ °æ¿ì ´ë°³ 20kbps ³»¿ÜÀÇ Àü¼Û¼Óµµ°¡
ÇÊ¿äÇϹǷΠÀÌ 100kbps ½ÅÈ£¼Óµµ¿¡ 20kbps ½ÅÈ£ 5 °³¸¦ ½Ç¾î¼ º¸³¾ ¼ö ÀÖ´Ù. À̶§ 100kbps ½ÅÈ£¿¡ 20kbps ½ÅÈ£¸¦ Â÷·Ê·Î
5°³ º¸³»°í ´Ù½Ã ´ÙÀ½¿¡ 5°³¸¦ º¸³»´Â °ÍÀÌ´Ù. °¢ »ç¿ëÀÚ ÀÔÀå¿¡¼ º¸¸é ÀÌ°ÍÀº ÀڱⰡ ÅëÈÇϴµ¥ ÇÊ¿äÇÑ 20kbps ½ÅÈ£¸¸À» ¼Û¼ö½ÅÇÏ´Â °ÍÀÌÁö¸¸
¹«¼±Ã¤³ÎÀ» »ç¿ëÇÒ ¶§´Â 100kbps ä³ÎÀ» ÃÑ 5°³ÀÇ Å¸ÀÓ½½·ÔÀ¸·Î ³ª´©¾î¼ °¢ »ç¿ëÀÚ´Â °¢°¢ ÇϳªÀÇ Å¸ÀÓ½½·ÔÀ» Á¡À¯ÇÏ¿© µ¥ÀÌÅ͸¦ Àü¼ÛÇÏ´Â °ÍÀÌ´Ù.
TDMA ¹æ½Ä¿¡¼ °¢ À½¼ºÃ¤³ÎÀº ¹Ù·Î ÀÌ Å¸ÀÓ½½·ÔÀÌ´Ù. À½¼ºÃ¤³Î¼ö¸¦ ´Ã¸®±â À§Çؼ´Â ÀÌ Å¸ÀÓ½½·ÔÀ» ´Ã·Á¾ß Çϴµ¥ ŸÀÓ½½·ÔÀ» ´Ã¸®¸é °¢ Àü¼Ûä³Îµµ
¿ª½Ã ³Ð¾îÁ®¾ß ÇϹǷΠRF Àü¼Ûä³Î ´ë¿ªÆø°ú ŸÀÓ½½·Ô¼ö¸¦ ÀûÀýÇÏ°Ô °áÁ¤ÇØ¾ß ÇÑ´Ù. ÇöÀç µðÁöƲ ¹æ½Ä À̵¿ÀüÈÀÇ ´ëÇ¥ÀûÀÎ GSM ¹æ½ÄÀº Àü¼Ûä³Î
´ë¿ªÆøÀÌ 200kHz·Î ŸÀÓ½½·Ô¼ö´Â 8 °³ÀÌ´Ù. À̸¦ µðÁöƲ ¹æ½Ä°ú ºñ±³ÇØ º¸¸é µðÁöƲ ¹æ½ÄÀº ¿ä±¸µÇ´Â ½ÅÈ£´ë ÀâÀ½ºñ°¡ ¾à 6dB-7dB ÀÌ°í,
ÀÌ·Î ÀÎÇÏ¿© ÁÖÆļö Àç»ç¿ë °è¼ö¸¦ 4 ¶Ç´Â 3 Á¤µµ±îÁö ÁÙÀÏ ¼ö ÀÖ¾î, ÀÌ¹Ì ¿©±â¼ °¡ÀÔÀÚ ¼ö¿ë¿ë·®ÀÌ ¾à 2¹è °¡·® Áõ°¡ÇÑ´Ù.
3. TDMA ¼ºñ½º ºñ±³
<Ç¥> ½ÃºÐÇÒ¹æ½Ä ¼ºñ½ºÀÇ ºñ±³
§ À̱ÛÀº Çѱ¹Åë½ÅÇÁ¸®ÅÚÀÇ ÇÏż÷¹Ú»ç°¡ ÁöÀº ±ÛÀÔ´Ï´Ù.
1.
GSMÀÇ ¿ª»ç
1982³â CEPT(Coference of European Posts and Telegraphs)¿¡¼´Â ¹üÀ¯·´¿ë À̵¿Åë½Å ½Ã½ºÅÛÀ» °³¹ßÇϱâ À§ÇØ
GSM(Group Special Mobile)À» Á¶Á÷ÇÏ¿´´Ù.
GSM ½Ã½ºÅÛÀº ¾Æ·¡ÀÇ Á¶°ÇÀ» ¸¸Á·½ÃÅ°´Â °ÍÀ» ¸ñÇ¥·Î ÇÏ¿´´Ù.
- ³ôÀº À½¼º Ç°Áú
- Àú·ÅÇÑ »ç¿ë ¿ä±Ý
- International Roaming Áö¿ø
- »õ·Î¿î ¼ºñ½º Áö¿ø
- ISDN°úÀÇ È£È¯¼º
1989³â¿¡ GSMÀº ETSI(European Telecommunication Standards Institute)·Î ÀÌ°üµÇ¾ú°í 1990³â
GSM PhaseIÀÌ ¹ßÇ¥µÇ¾ú´Ù. »ó¿ë ¼ºñ½º´Â 1991³â Á߹ݿ¡ ½ÃÀ۵ǾúÀ¸¸ç 1993³â¿¡´Â Àü¼¼°è 22°³±¹¿¡ 36°³ÀÇ GSM ¸ÁÀÌ ±¸ÃàµÇ¾ú´Ù.
GSM, DCS1800, PCS1900Àº Àü¼¼°è 80°³±¹¿¡ º¸±ÞµÇ¾úÀ¸¸ç GSMÀº Global System for Mobile·Î À̸§ÀÌ ¹Ù²î¾ú´Ù.
2. GSM ¼ºñ½º
GSMÀº °³¹ß ´Ü°èºÎÅÍ ISDN°úÀÇ È£È¯¼ºÀ» ¸ñÇ¥·Î ÇÏ¿´Áö¸¸ ¹«¼±»óÀÇ Á¦¾à¶§¹®¿¡ ISDN-B channel 64kbps´Â Áö¿øÀÌ ºÒ°¡´ÉÇÏ´Ù.
Åë½Å ¼ºñ½º´Â Teleservices, Data services, Supplementary services·Î ³ª´¼ö ÀÖ´Ù. GSMÀÇ °¡Àå ±âº»ÀûÀÎ
¼ºñ½º´Â Telephony ¼ºñ½º¶ó°í º¼¼ö ÀÖÀ¸¸ç ´Ù¸¥ µðÁöÅ» Åë½Å°ú ¸¶Âù°¡Áö·Î À½¼ºÀº µðÁöÅ»·Î ÀÎÄÚµùµÇ¾î µðÁöÅ» ºñÆ®¿ÀÇ ÇüÅ·ΠÀü¼ÛµÈ´Ù.
GSMÀÌ Áö¿øÇÏ´Â ¼ºñ½º Áß¿¡´Â Emergency Service°¡ Àִµ¥ °¡ÀÔÀÚ´Â ¼¼ÀÚ¸®ÀÇ ÀüȹøÈ£¸¦ ÀÌ¿ëÇØ ±ä±ÞÈ£¸¦ ¹ß»ý½Ãų ¼ö ÀÖÀ¸¸ç ¹«·á·Î
ÅëÈÇÒ ¼ö ÀÖ´Ù. GSMÀº POTS(Plain Old Telephone Service), ISDN(Integrated Services Digital
Network), PSPDN(Packet Switched Public Data Network), CSPDN(Circuit Switched
Public Data Network)¿¡ Á¢¼ÓµÇ¾î ÃÖ´ë 9600bps·Î Åë½ÅÀ» ÇÒ¼ö ÀÖÀ¸¸ç À̶§ X.25 ¶Ç´Â X.32µî ´Ù¾çÇÑ ÇÁ·ÎÅäÄÝÀ» »ç¿ëÇÒ
¼ö ÀÖ´Ù. GSMÀÌ ISDNÀ̳ª ´Ù¸¥ µðÁöÅ» ¸Á°ú Á¢¼Ó½Ã¿¡ º°µµÀÇ ¸ðµ©ÀÌ ÇÊ¿äÄ¡ ¾ÊÁö¸¸ ¾Æ³¯·Î±× POTS¿Í Á¢¼Ó½Ã¿¡´Â Audio ModemÀÌ ÇÊ¿äÇÏ´Ù.
ÀÌ¿Ü G3 Æѽº, SMS(Short Message Service) ±â´ÉÀ» Áö¿øÇÑ´Ù. SMS´Â ¾ç¹æÇâÀÇ ´Ü¹® Àü¼Û ¼ºñ½º·Î ÃÖ´ë 160byte±îÁö
Àü¼ÛÇÒ ¼ö ÀÖÀ¸¸ç ½ÇÁ¦ÀûÀ¸·Î´Â 170ÀÚ±îÁö Àü¼ÛÇÒ ¼ö ÀÖ´Ù. SMS´Â Point-to-point ¼ºñ½º³ª Cell Broadcasting ¼ºñ½º·Î
È°¿ëµÉ ¼ö ÀÖÀ¸¸ç SIM¿¡ ÀúÀå½Ãų ¼öµµ ÀÖ´Ù.
GSM PhaseI¿¡¼´Â Call Forwarding(¼ö½ÅÀÚ°¡ Àüȸ¦ ¹ÞÀ»¼ö ¾øÀ» °æ¿ì ´Ù¸¥ ÀüÈ ¹øÈ£·Î Âø½Å ÀüȯÇÏ´Â ¼ºñ½º)°ú Call
Barring(Incoming/Outgoing) ±â´ÉÀ» Áö¿øÇÏ¿´°í PhaseII¿¡¼´Â Caller Identification(¹ß½ÅÀÚÀÇ ÀüȹøÈ£¿Í
À̸§ÀÌ Ç¥½ÃµÊ), Call Waiting, Multi-party Conversation(´Ù¼öÀÇ »ç¶÷ÀÌ µ¿½Ã¿¡ ÅëÈÇÒ ¼ö ÀÖÀ½) µîÀ» Á¦°øÇÏ¿´´Ù.
3. GSM¿¡ ´ëÇÑ ÀÏ¹Ý »çÇ×
1) Åë½Å¸ÁÀÇ ºÐ·ù
Åë½Å¸ÁÀº ¾Æ·¡ÀÇ 4°¡Áö·Î ºÐ·ùÇÒ ¼ö ÀÖ´Ù.
- Stationary Terrestrial Networks : PSTN, ISDN
- Cellular Networks : GSM, CDMA, DCS, PCS
- Wireless Terminals : CT1, CT2, DECT
- Satellite Based Systems : Inmarsat, Iridium
°íÁ¤ À¯¼±¸ÁÀº ÇöÀç °¡Àå ³Î¸® ÆÛÁ®ÀÖ´Â ³×Æ®¿÷ÀÌ¸ç ¾Æ³¯·Î±× PSTN°ú µðÁöÅ» ISDNÀ¸·Î ±¸ºÐµÈ´Ù.(ISDNÀº GSM°ú LAPD ÇÁ·ÎÅäÄÝ·Î ¿¬µ¿µÊ)
2) ¼¿·ê¶ó ³×Æ®¿÷ÀÇ Á¾·ù
GSM °è¿ÀÇ ¸ÁÀ¸·Î´Â GSM900°ú DCS1800, PCS1900ÀÌ ÀÖ´Ù. ÀÌµé ¹æ½ÄÀº TDMA¿¡ ±âÃÊÇÏ°í ÀÖÀ¸¸ç PCS1900Àº ºÏ¹Ì¿¡¼ »ç¿ëµÇ´Â
¹æ½ÄÀÌ´Ù. DCS1800Àº GSM900°ú ¸Å¿ì À¯»çÇÏ¸ç ´ÜÁö ¿î¿ëµÇ´Â ÁÖÆļö ´ë¿ªÀÌ °íÁÖÆĶó´Â Á¡¸¸ ´Ù¸£´Ù.
3) ¼¿·ê¶óÀÇ °³³ä
CellÀ̶õ ÇϳªÀÇ ±âÁö±¹(BTS)°¡ Ä¿¹öÇÏ´Â Áö¿ªÀ» ¶æÇϸç ÀÌÇظ¦ µ½±â À§ÇØ Åë»ó À°°¢ÇüÀ¸·Î Ç¥½ÃµÈ´Ù. °¢ BTS´Â °íÀ¯ÀÇ ÁÖÆļö¸¦ »ç¿ëÇϴµ¥
ÀÌ°ÍÀº ÀÎÁ¢ ¼¿¿¡¼ÀÇ °£¼·À» ÇÇÇϱâ À§ÇÑ °ÍÀÌ´Ù. ½ÇÁ¦·Î ¼¿ÀÇ ¸ð¾çÀº À°°¢ÇüÀÌ ¾Æ´Ï¸ç °¡ÀÔÀÚÀÇ ¹Ðµµ³ª ÁÖº¯ ÁöÇü¿¡ µû¶ó ´Ù¾çÇÑ ÇüŸ¦ °¡Áø´Ù.
4) ¿©·¯°¡Áö ¼¿ÇüÅÂ
¼¿Àº Å©°Ô Umbrella Cell(¹Ý°æ 100km, À§¼ºÅë½Å), Hyper Cell(¹Ý°æ 20km, µµ½Ã¿Ü°û Áö¿ª), Macro Cell(¹Ý°æ
1~20km, °í¼Óµµ·Î ÁÖº¯), Micro Cell(50~300m, µµ½É Áö¿ª), Pico Cell(~100m, °Ç¹°³»)·Î ±¸ºÐÇÒ ¼ö ÀÖ´Ù.
Umbrella CellÀº GSM ¸Á¿¡¼´Â ¾²ÀÌÁö ¾Ê´Âµ¥ ±×°ÍÀº GSM900ÀÇ ÃÖ´ë ¹Ý°æÀÌ 35kmÀÌ°í DCS1800ÀÇ °æ¿ì 10kmÀ̱⠶§¹®ÀÌ´Ù.
³ª¸ÓÁö ³×°¡Áö ÇüÅÂÀÇ ¼¿Àº GSM ¸Á¿¡¼ ¸ðµÎ »ç¿ëµÈ´Ù.
4. GSM ¸ÁÀÇ ±¸Á¶
GSM ¸ÁÀº Mobile Station(MS), Base Station Subsystem(BSS), Network SubsystemÀ¸·Î ±¸¼ºµÈ´Ù.
Network SubsystemÀº ±³È¯ ±â´ÉÀ» ÇÏ´Â ºÎºÐÀ̸ç BSS´Â MSC¿Í A Interface·Î ½ÅÈ£¸¦ ÁÖ°í ¹Þ°í MS¿Í BSSÀº Air
Interface·Î ¿¬°áµÈ´Ù.
1) Mobile Station(MS)
MS(´Ü¸»±â)´Â ´Ü¸» ÀåÄ¡¿Í Smart CardÀÇ ÀÏÁ¾ÀÎ SIM(Subscriber Identity Module)À¸·Î ±¸¼ºµÈ´Ù. SIMÀº °³ÀÎÀÇ
À̵¿¼ºÀ» Á¦°øÇÏ´Â °ÍÀ¸·Î »ç¿ëÀÚ´Â ÀÚ½ÅÀÇ ´Ü¸»±â°¡ ¾Æ´Ï´õ¶óµµ SIM¸¸ ³ÖÀ¸¸é ´Ù¸¥ ´Ü¸»±âµµ »ç¿ëÀÌ °¡´ÉÇÏ´Ù. ´Ü¸»±â´Â °¢°¢ °íÀ¯ÀÇ
IMEI(International Mobile Equipment Identity)¸¦ °¡Áö°í ÀÖ´Ù. IMSI(International
Mobile Subscriber Identity)´Â SIM¿¡ ÀúÀåµÇ¾î ÀÖÀ¸¸ç ½Ã½ºÅÛ¿¡ Á¢¼Ó½Ã ÀÎÁõ¿ëÀ¸·Î »ç¿ëµÈ´Ù. ´Ù½Ã¸»Çϸé IMEI¿Í
IMSI´Â GSM¿¡¼ °³ÀÎÀÇ À̵¿¼ºÀ» º¸ÀåÇϱâ À§ÇÑ °ÍÀÌ´Ù. SIM Card´Â PIN(Personal Identity Number)·Î º¸È£µÇ´Âµ¥
ÀÌ PINÀº 4ÀÚ¸®ÀÇ ¼ýÀÚ·Î Á¶ÇÕµÈ ÄÚµåÀ̸ç GSM ¸Á Á¢¼Ó½Ã ÇÊ¿äÇÏ´Ù.
2) Base Station Subsystem(BSS)
BSS´Â BTS(Base Transceiver Station)°ú BSC(Base Station Controller)·Î ±¸¼ºµÇ¸ç BTS¿Í BSC´Â
Abis Interface¸¦ ÀÌ¿ëÇÏ¿© ½ÅÈ£¸¦ ÁÖ°í ¹Þ´Â´Ù. BTS´Â ¹«¼± ¼Û¼ö½Å±â·Î ±¸¼ºµÈ ÀåºñÀÌ¸ç ´Ü¸»±â¿Í ¹«¼± ¸µÅ©¸¦ ÅëÇÏ¿© ±³½ÅÇÑ´Ù.
BSC´Â ´Ù¼öÀÇ BTS¸¦ °ü¸®ÇÏ¸ç ¹«¼± ä³Î Setup, Frequency Hopping, Handover 󸮸¦ ´ã´çÇÑ´Ù. BSC´Â BTS¿Í
MSC¸¦ ¿¬°áÇÏ´Â Àåºñ·Î º¸¾Æµµ µÈ´Ù.
3) Network Subsystem
Network Subsystem¿¡¼ °¡Àå Áß½ÉÀÌ µÇ´Â °ÍÀº MSC(Mobile Switching Center)ÀÌ´Ù. MSC´Â PSTNÀÇ ±³È¯±â¿Í
À¯»çÇϸç À̵¿¼º °ü¸®, À§Ä¡ µî·Ï/°ü¸®, ÀÎÁõ, ÇÚµå¿À¹ö, ·Î¹ÖµîÀ» ´ã´çÇÑ´Ù.
HLR(Home Location Register)¿Í VLR(Visitor Location Register)´Â MSC¿Í ÇÔ²² Call
Routing°ú Roaming ±â´ÉÀ» Á¦°øÇÑ´Ù. HLRÀº °¡ÀÔÀÚÀÇ Á¤º¸¿Í ´Ü¸»ÀÇ À§Ä¡ Á¤º¸¸¦ ´ã°í ÀÖÀ¸¸ç ´Ü¸»ÀÇ À§Ä¡ Á¤º¸´Â VLRÀÇ
Signaling Address¿¡ Æ÷ÇԵǾî ÀÖ´Ù. HLRÀº ³×Æ®¿÷´ç 1´ë¸¸ ¼³Ä¡ÇÏ¸ç ºÐ»ê µ¥ÀÌŸ º£À̽ºÀÇ ÇüÅ·Π±¸ÇöµÈ´Ù.
VLRÀº HLRÀÇ Á¤º¸Áß ÀϺÎ(´Ü¸»ÀÇ ÇöÀç À§Ä¡)¸¦ ÀúÀåÇÏ°í Àִµ¥ ÁַΠȣÁ¦¾î¿Í ¼ºñ½º Á¦°ø¿¡ °ü·ÃµÈ Á¤º¸µéÀÌ´Ù. VLRÀº µ¶¸³ÀûÀ¸·Î ±¸ÇöÇÒ
¼öµµ ÀÖÀ¸³ª ÃÖ±Ù¿¡´Â MSC³»¿¡ ±¸ÇöÇÏ´Â Ãß¼¼ÀÌ´Ù.
¶Ç´Ù¸¥ Network SubsystemÀ¸·Î EIR(Equipment Identity Register)¿Í AuC(Authentication
Center)°¡ ÀÖ´Ù. EIRÀº °¢ ´Ü¸»±âÀÇ À¯È¿¼º ¿©ºÎ¸¦ ÆÇ´ÜÇÏ´Â µ¥ÀÌŸ º£À̽º·Î¼ IMEI Á¤º¸¸¦ ´ã°íÀÖ´Ù. ¸¸¾à ¾î¶² ´Ü¸»±âÀÇ IMEI°¡
ºÐ½Ç ȤÀº µµ³µÈ °ÍÀ¸·Î ÆǸíµÇ¸é ¸ÁÁ¢¼ÓÀÌ ºÒÇãµÈ´Ù. AuC´Â SIM Card¿¡ ¼ö·ÏµÈ ÀÎÁõÅ°¿¡ °ü·ÃµÈ Á¤º¸¸¦ ÀúÀåÇÏ°í ÀÖ´Â µ¥ÀÌŸ º£À̽º·Î¼
Authentication°ú Encryption ±â´ÉÀ» ¼öÇàÇÑ´Ù.
5. GSMÀÇ ¹«¼± ¸µÅ©
GSM900¿ëÀ¸·Î Uplink¿¡´Â 890~915MHz, Downlink¿¡´Â 935~960MHz ´ë¿ªÀÌ ÇÒ´çµÇ¾ú´Ù. Uplink¶õ ´Ü¸»±â¿¡¼ ±âÁö±¹
¹æÇâÀ¸·ÎÀÇ Àü¼Û °æ·Î¸¦ ¸»Çϸç Downlink´Â ¹Ý´ë·Î ±âÁö±¹¿¡¼ ´Ü¸»±â·ÎÀÇ Àü¼Û °æ·Î¸¦ ¶æÇÑ´Ù. GSM900¿ëÀ¸·Î ¸ðµÎ 2 * 25MHzÀÇ ÁÖÆļö
´ë¿ªÀÌ ÇÒ´çµÈ ¼ÀÀÌ´Ù. DCS1800Àº Uplink·Î 1710~1785MHz°¡ ÇÒ´çµÇ¾ú°í Downlink·Î 1805~1880MHz°¡ ÇÒ´çµÇ¾ú´Ù.
1) ´ÙÁßÁ¢¼Ó°ú ä³Î ±¸Á¶
ÁÖÆļö ÀÚ¿øÀº ÇÑÁ¤µÇ¾î ÀÖÀ¸¹Ç·Î °¡±ÞÀûÀÌ¸é ´Ù¼öÀÇ »ç¿ëÀÚ°¡ µ¿½Ã¿¡ ä³ÎÀ» È¿À²ÀûÀ¸·Î ÀÌ¿ëÇÏ´Â ¹æ¾ÈÀ» ¸ð»öÇÏ°Ô µÇ¾ú°í GSMÀº ´ÙÁßÁ¢¼Ó ¹æ½ÄÀ¸·Î
TDMA¸¦ ¼±ÅÃÇÏ¿´´Ù.(TDMA´Â FDMAÀÇ °³³äÀ» Æ÷ÇÔÇÏ´Â °³³äÀÓ) FDMAÀÇ Ãø¸é¿¡¼ º¸¾ÒÀ»¶§ ÃÑ 25MHz¿¡ À̸£´Â ÁÖÆļö ´ë¿ªÀ»
200KHz ´ë¿ªÀÇ Ã¤³Î 124°³·Î ºÐÇÒ ÇÏ¿´´Ù. ÀÌ·¸°Ô ºÐÇÒµÈ Ã¤³ÎÀº ´Ù½Ã TDMA ¹æ½ÄÀ» ÀÌ¿ëÇÏ¿© ½Ã°£À¸·Î ºÐÇҵǴµ¥ TDMA¿¡¼ °¡Àå ±âÃÊ°¡
µÇ´Â ´ÜÀ§ÀÎ Time Slot(Burst Peroid¶ó°íµµ ºÎ¸§)Àº 15/26msÀÇ ±æÀ̸¦ °¡Áø´Ù. ÇϳªÀÇ TDMA ÇÁ·¹ÀÓ¿¡´Â ¸ðµÎ 8°³ÀÇ
Time SlotÀÌ ÀÖÀ¸¸ç ÇϳªÀÇ ³í¸®Àû ä³ÎÀº ÇϳªÀÇ Time SlotÀÌ´Ù. TDMA¿¡¼ ä³Î ÆÐÅÏÀº ¾à 3½Ã°£¸¶´Ù ÁÖ±âÀûÀ¸·Î ¹Ýº¹µÈ´Ù.
À½¼º°ú µ¥ÀÌŸ ½ÅÈ£¸¦ Àü¼ÛÇϱâ À§ÇØ »ç¿ëµÇ´Â ä³ÎÀ» TCH(Traffic Channel)À̶ó°í ÇÑ´Ù. TCH´Â 26-frame
Multiframe ¶Ç´Â 26 TDMA Frame GroupÀ¸·Î Á¤ÀǵǸç 26-frame MultiframeÀÇ ±æÀÌ´Â 120msÀÌ´Ù. 26°³ÀÇ
frameÁß 24°³´Â Æ®·¡ÇÈ¿ëÀÌ°í 1°³´Â SACCH(Slow Associated Control Channel)ÀÌ¸ç ³ª¸ÓÁö Çϳª´Â »ç¿ëµÇÁö ¾Ê´Â´Ù.
Uplink¿Í DownlinkÀÇ TCH´Â 3 Time SlotÀ¸·Î ±¸ºÐµÇ¾î ÀÖÀ¸¹Ç·Î ´Ü¸»±â´Â ¼Û¼ö½ÅÀ» µ¿½Ã¿¡ ÇÒ ÇÊ¿ä°¡ ¾ø°í ÀÌ´Â ´Ü¸»±âÀÇ Àü±âÀû
±¸Á¶°¡ °£´ÜÇØÁú ¼ö ÀÖÀ½À» ÀǹÌÇÑ´Ù. Full rate TCH¿Ü¿¡ Half rate TCH°¡ Á¤ÀǵǾî ÀÖÀ¸¸ç Half rate TCH¸¦ »ç¿ëÇÒ
°æ¿ì ½Ã½ºÅÛÀÇ ¿ë·®Àº 2¹è·Î Áõ°¡µÉ ¼ö ÀÖ´Ù.
2) Àü·Â Á¦¾î
GSM ´Ü¸»±â´Â ÃÖ´ë Ãâ·Â 20, 8, 5, 2, 0.8wattÀÇ 5 Class·Î ±¸ºÐµÇ¸ç 20W ´Ü¸»±â¸¦ Class1·Î ºÎ¸£°í 0.8W ´Ü¸»±â¸¦
Class5·Î ºÎ¸¥´Ù. Co-Channel Inteference¸¦ ÃÖ¼ÒÈÇϱâ À§ÇØ ±âÁö±¹°ú ´Ü¸»±â´Â À½¼º Ç°ÁúÀ» À¯ÁöÇϱâ À§ÇÑ ÃÖ¼ÒÀÇ Ãâ·ÂÀ¸·Î
¿î¿ëµÈ´Ù. Àü·ÂÀÇ ·¹º§Àº 2dB ´ÜÀ§·Î ³ô¾ÆÁö°Å³ª ³·¾ÆÁö¸ç ÃÖ¼Ò 13dBm, Áï 20mW±îÁö Á¶Á¤µÈ´Ù. ´Ü¸»±â´Â BER(Bit Error
Rate)À» ÀÌ¿ëÇÏ¿© ½ÅÈ£ÀÇ ¼¼±â¿Í Ç°ÁúÀ» ÃøÁ¤ÇÏ¿© ¾ðÁ¦ Àü·Â ·¹º§À» Á¶Á¤ÇØ¾ß ÇÒÁö¸¦ °áÁ¤ÇÑ´Ù.
6. GSM Network
¼¿·ê¶ó ³×Æ®¿÷¿¡¼´Â ¹«¼± ¸µÅ©¸¦ ÅëÇÏ¿© À½¼º°ú µ¥ÀÌŸ¸¦ ¾î´À Á¤µµÀÇ Ç°ÁúÀ» À¯ÁöÇϸç Àü¼ÛÇØ¾ß ÇÑ´Ù. ¼ºñ½º Áö¿ªÀº ¼¿·Î Áö¿ªÀûÀ¸·Î ºÐÇҵǾî ÀÖÀ¸¸ç
ÇÚµå¿À¹ö°¡ ÀϾÙ. GSMÀÇ °æ¿ì °¡ÀÔÀÚ´Â International RoamingÀ» ¿ä±¸ÇÒ ¼ö ÀÖÀ¸¸ç À̶§ µî·Ï, ÀÎÁõ, Call
RoutingµîÀÇ ±â´ÉÀÌ ÇÊ¿äÇÏ´Ù.
GSMÀÇ Signaling ProtocolÀº ¼¼°³ÀÇ °èÃþÀ¸·Î ÀÌ·ç¾îÁ® ÀÖ´Ù. Layer1Àº Physical Layer·Î ä³ÎÀÇ ±¸Á¶¿¡ ÇØ´çµÇ´Â
ºÎºÐÀ̸ç Layer2´Â Data Link Layer·Î Um Interface¸¦ ±¸¼ºÇÏ´Â ºÎºÐÀε¥ LAPDÀÇ ¼öÁ¤ ¹öÁ¯ÀÎ LAPDmÀÌ´Ù. A
interface·Î´Â SS No.7(Signaling System No.7)ÀÇ MTP(Message Transfer Part) Layer2°¡ »ç¿ëµÈ´Ù.
Layer3´Â 3°³ÀÇ Sublayer·Î ³ª´µ¾îÁö¸ç ¹«¼± ÀÚ¿øÀÇ °ü¸®, À̵¿¼º °ü¸®¸¦ ´ã´çÇÑ´Ù.
1) Radio Resource Management(RR)
Radio Resource Management(RR)Àº ´Ü¸»±â¿Í MSC°£ÀÇ ¹«¼± ¸µÅ©ÀÇ ¼³Á¤À» ´ã´çÇÏ¸ç ¿©±â¿¡´Â MS, BSS, MSC°¡ °ü·ÃµÇ¾î
ÀÖ´Ù.
¼¿·ê¶ó ³×Æ®¿÷¿¡¼´Â È£°¡ ±â¼³Á¤µÈ ä³Î¿¡¼ ´Ù¸¥ ä³Î·Î À̵¿ÇÏ´Â °æ¿ì°¡ ¸¹À¸¸ç À̸¦ ÇÚµå¿À¹ö(Handover)¶ó°í ºÎ¸¥´Ù. ÇÚµå¿À¹ö´Â ¼¿°£À» À̵¿ÇÒ¶§
¹ß»ýµÇ´Âµ¥ ÇÚµå¿À¹öÀÇ ÃøÁ¤°ú ¼öÇàÀº RR °èÃþÀÇ ÁÖ¿ä ±â´ÉÁß ÇϳªÀÌ´Ù.
GSM¿¡´Â ´ÙÀ½ ³×°¡ÁöÀÇ ÇÚµå¿À¹ö°¡ ÀÖ´Ù.
- µ¿ÀÏ ¼¿³»¿¡¼ ä³Î, Áï Time Slot°£ÀÇ ÇÚµå¿ÀÇÁ
- µ¿ÀÏ BSC³»ÀÇ ÇÚµå¿ÀÇÁ
- µ¿ÀÏÇÑ MSC³»¿¡¼ ¼·Î ´Ù¸¥ BSC°£ÀÇ ÇÚµå¿ÀÇÁ
- ¼·Î ´Ù¸¥ MSC°£ÀÇ ÇÚµå¿ÀÇÁ
À§ÀÇ ³×°¡Áö TypeÁß Ã³À½ µÎ°¡Áö ÇÚµå¿ÀÇÁ¸¦ Internal Handoff¶ó°í Çϸç BSCÀÇ Á¦¾î¸¦ ¹Þ´Â´Ù. ÇÚµå¿ÀÇÁÀÇ Ãø¸é¿¡¼ º¸¾ÒÀ»¶§ ¼¿Àº
´Ü¸»±â°¡ ÀûÁ¤ÇÑ ½ÅÈ£ ¼¼±â¿Í Ç°ÁúÀ» À¯ÁöÇϸç À½¼ºÀ̳ª µ¥ÀÌŸ¸¦ ¼ö½Å¹ÞÀ» ¼ö ÀÖ´Â Áö¿ªÀ» ÀǹÌÇϴµ¥ ¸¸¾à ¾î¶² ¼¿¿¡¼ ÅëÈÁßÀÎ ´Ü¸»±â°¡ À̵¿Áß¿¡
½ÅÈ£ÀÇ ¼¼±â°¡ ¾àÇØÁüÀ» °¨ÁöÇϸé À̸¦ BTS ¹× BSC·Î º¸°íÇÏ¿© ´Ù¸¥ ¼¿·ÎÀÇ ÀüȯÀ» ¿ä±¸ÇÏ°Ô µÈ´Ù. Internal Handoff¿¡¼´Â ÇÚµå¿ÀÇÁ¿¡
»ç¿ëµÇ´Â ½ÅÈ£ 󸮸¦ °£¼ÒÈÇϱâ À§ÇØ BSC´Â ÇÚµµ¿ÀÇÁÀÇ ¼öÇà °á°ú¸¸À» MSC·Î º¸°íÇÑ´Ù.
³ª¸ÓÁö µÎ°¡ÁöÀÇ ÇÚµå¿ÀÇÁ´Â External Handoff¶ó°í ºÎ¸£¸ç MSCÀÇ Á¦¾î¸¦ ¹Þ´Â´Ù. External Handoff´Â MSC³ª ´Ü¸»±â¿¡
ÀÇÇØ InitiateµÉ ¼ö Àִµ¥ Idle Time Slot µ¿¾È ´Ü¸»±â´Â ÃÖ´ë 16°³ ÀÎÁ¢¼¿ÀÇ Broadcast Control ChannelÀ»
Ž»öÇÏ°í ¼ö½ÅµÈ ½ÅÈ£ÀÇ ¼¼±â¸¦ ÃøÁ¤ÇÏ¿© ÇÚµå¿ÀÇÁ¸¦ À§ÇÑ 6°³ÀÇ Best Candidate¸¦ ¼±ÅÃÇÑ´Ù. ÀÌ Á¤º¸´Â BSC¸¦ °ÅÃÄ MSC·Î º¸°í µÇ¸ç
ÃÖ¼Ò 1ÃÊ¿¡ Çѹø º¸°íµÇ¾î ÇÚµå¿À¹ö ¾Ë°í¸®ÁòÀ¸·Î »ç¿ëµÈ´Ù.
GSMÀÇ ±Ç°í¾È¿¡´Â ÇÚµå¿ÀÇÁ¿¡ ´ëÇÑ ±ÔÁ¤ÀÌ ¾ø´Ù. GSM¿¡¼ ÇÚµå¿ÀÇÁ·Î ÁÖ·Î »ç¿ëµÇ´Â ¹æ¹ý¿¡´Â µÎ°¡Áö°¡ Àִµ¥ ¸ðµÎ Àü·Â Á¦¾î¿Í °ü·ÃµÈ °ÍÀÌ´Ù.
±×Áß Çϳª°¡ Minimum Acceptable Performance ¾Ë°í¸®ÁòÀ¸·Î ÇÚµå¿À¹ö ÀÌÀü¿¡ Àü·Â Á¦¾î¸¦ ¼öÇàÇÏ´Â ¹æ½ÄÀÌ´Ù. Áï, ¾î¶² ƯÁ¤°ª
ÀÌÇÏ·Î ½ÅÈ£°¡ ¾à鵃 ¶§ ´Ü¸»±âÀÇ Ãâ·ÂÀ» ¿ì¼± ³ôÀÌ°í ±×·¡µµ ½ÅÈ£ Ç°ÁúÀÌ °³¼±µÇÁö ¾ÊÀ»¶§¸¸ ÇÚµå¿À¹ö¸¦ ÇÑ´Ù. ÀÌ ¹æ½ÄÀº ¸Å¿ì ´Ü¼øÇÏ¿© ¸¹ÀÌ »ç¿ëµÇÁö¸¸
¼¿ÀÇ °æ°è Áö¿ª¿¡¼ ´Ü¸»±â°¡ ÃÖ´ë Ãâ·ÂÀ¸·Î Àü¼ÛÁß¿¡ ´Ù¸¥ ¼¿·Î À̵¿ÇØ ¹ö¸®¸é ÇÚµå¿ÀÇÁ°¡ µÇÁö ¾Ê´Â ¹®Á¦Á¡ÀÌ ¹ß»ýÇÑ´Ù.
¶Ç ´Ù¸¥ ¹æ½ÄÀº Power BudgetÀ̶ó´Â ¹æ½ÄÀ¸·Î ½ÅÈ£ÀÇ Ãâ·ÂÀ» ÀûÁ¤ ¼öÁØÀ¸·Î À¯ÁöÇϰųª °³¼±Çϱâ À§ÇØ ÇÚµå¿À¹ö¸¦ ÀÌ¿ëÇÏ´Â ¹æ½ÄÀÌ´Ù. ´Ù½Ã
¸»Çϸé Àü·Â Á¦¾î ÀÌÀü¿¡ ÇÚµå¿À¹ö°¡ ¼öÇàµÇ´Â ¹æ½ÄÀÌ´Ù. ÀÌ ¹æ½ÄÀº ¼¿ÀÇ °æ°è¿¡¼µµ ¿øÈ°ÇÑ ÇÚµå¿ÀÇÁ°¡ ÀÌ·ç¾îÁú ¼ö ÀÖµµ·Ï Çϸç ÀÎÁ¢ ä³Î·Î ºÎÅÍÀÇ
°£¼·À» ÁÙ¿© ÁÖÁö¸¸ º¹ÀâÇÏ¿© ±¸ÇöÇϱ⠾î·Æ´Ù´Â ´ÜÁ¡ÀÌ ÀÖ´Ù.
7. ¸ÎÀ½¸»
GSM°ú DCS1800Àº PCS¸¦ ¼ºñ½ºÇϴµ¥ ÀÖ¾î ¿Ïº®ÇÑ SolutionÀ» Á¦°øÇÑ´Ù. SIMÀÇ °³³äÀº ´Ü¸»ÀÇ À̵¿¼º »Ó¸¸ ¾Æ´Ï¶ó °³ÀÎÀÇ À̵¿¼ºÀ»
Á¦°øÇϴ ù¹ø° ½ÃµµÀ̸ç International RoamingÀ» °¡´ÉÄÉ ÇÑ´Ù. À½¼º ÅëÈ¿Ü¿¡µµ GSMÀº µ¥ÀÌŸ ¼ºñ½º, Æѽº ¼ºñ½º, SMS¿Í
´Ù¸¥ ºÎ°¡ ±â´ÉÀ» Á¦°øÇϹǷΠPCSÀÇ °³³ä¿¡ °¡Àå ±ÙÁ¢ÇÑ ±â¼úÀÌ¶ó º¼¼ö ÀÖ´Ù. GSMÀº ºñ·Ï ¸Å¿ì º¹ÀâÇÑ ±â¼úÀÌÁö¸¸ ÀÌ°ÍÀº Àú·ÅÇÑ °¡°Ý¿¡ ÁÁÀº
Ç°ÁúÀÇ ¼ºñ½º¸¦ Á¦°øÇϱâ À§ÇÑ °ÍÀÏ »ÓÀÌ´Ù.
Vendor
|
Model
|
-Market Date -
|
-Frequency Bands -
|
-Multi-slot Class -
|
-More Information -
|
Alcatel
|
502
|
Q2
2001
|
900
/ 1800
|
1+1
|
Website
|
Alcatel
|
701
|
Q4
2001
|
900
/ 1800
|
4+1
|
Website
|
Alcatel
|
702
|
Q4
2001
|
900
/ 1800
|
4+1
|
Website
|
Audiovox
|
GP710
|
Q4
2001
|
900
/ 1800
|
4+1
|
Website
Data Sheet Available
|
Ericsson
|
GM47
M2M module
|
Available
|
900
/ 1800
|
-
|
Website
|
Ericsson
|
GM48
M2M module
|
Available
|
850
/ 1900
|
-
|
Website
|
Ericsson
|
T39m
|
Available
|
900
/ 1800 / 1900
|
3+1
|
Website
|
Ericsson
|
T65
|
Q4
2001
|
900
/ 1800
|
3+1
|
Website
|
Ericsson
|
T68
|
Q4
2001
|
900
/ 1800 / 1900
|
3+1
|
Website
|
Ericsson
|
R520m
|
Available
|
900
/ 1800 / 1900
|
3+1
|
Website
|
Ericsson
|
R600
|
Q1
2002
|
900
/ 1800
|
3+1
|
Website
|
GTran Wireless
|
DotSufer
PCMCIA
|
Q3
2001
|
1800
|
4+2
|
Website
|
GTran Wireless
|
DotSufer
PCMCIA
|
Q4
2001
|
900
/ 1800
1900
|
4+2
|
Website
|
GTran Wireless
|
GPC-7001
PCMCIA
|
Q1
2002
|
900
/ 1800
|
Class
10
|
-
|
GTran Wireless
|
GPC
7002
PCMCIA
|
Q2
2002
|
900
/ 1800
|
Class
10
|
-
|
GTran Wireless
|
GPC
7003
PCMCIA
|
Q3
2002
|
900
/ 1800
1900
|
Class
10
|
-
|
Handspring
|
Treo
180
|
Q1
2002
|
900
/ 1900
|
-
|
Website
|
Handspring
|
Treo
270
|
Q2
2002
|
900
/ 1900
|
-
|
Website
|
Motorola
|
T260
|
Available
|
900
/ 1800
1900
|
2+1
|
-
|
Motorola
|
T280
|
Q4
2001
|
900
/ 1800
1900
|
4+1
|
-
|
Motorola
|
Talkabout
192
|
Q4
2001
|
900
/ 1800
1900
|
4+1
|
-
|
Motorola
|
Timeport
P7389i
|
Available
|
900
/ 1800
1900
|
2+1
|
Website
|
Motorola
|
Timeport
P7382i
|
Available
|
1900
|
2+1
|
Website
|
Motorola
|
Accompli
008
|
Available
|
900
/ 1800
1900
|
3+1
|
-
|
Motorola
|
Accompli
009
|
Q3
2001
|
900
/ 1800
1900
|
-
|
Website
|
Motorola
|
V
Series
V.66
|
Q3
2001
|
900
/ 1800
1900
|
4+1
|
Website
|
Motorola
|
V
Series
V.60
|
Q4
2001
|
900
/ 1800
1900
|
-
|
-
|
Nokia
|
30
M2M
|
Q1
2002
|
EGSM900
GSM1800
|
Class
6 (3+1,2+2,2+1)
|
Website
|
Nokia
|
6310
|
Q4
2001
|
900
/ 1800
|
3+1
|
Website
|
Nokia
|
7650
|
Q1
2002
|
EGSM900
GSM1800
|
-
|
Website
|
Nokia
|
8310
|
Q4
2001
|
900
/ 1800
|
3+1
|
Website
|
Novatel
|
Merlin
G100
PCMCIA
|
Q4
2001
|
1900
900 / 1800
|
4+2
|
Website
|
Novatel
|
Expedite
G301
Embedded Modem
|
2002
|
1900
900 / 1800
|
4+2
|
Website
|
O2 (Formally BT Cellnet)
|
xda
|
Q1
2002
|
EGSM900
GSM1800
|
Class
B
|
Website
|
Option
|
Globetrotter
PCMCIA
Compaq i-PAQ
|
Q4
2001
Q1 2002
|
1900
900 / 1800
|
4+2
|
Website
Data Sheet Available
|
Panasonic
|
GD96
|
Q4
2001/Q1 2002
|
900
/ 1800
|
4+1
|
-
|
Philips
|
Fisio
610
|
Q3
2001
|
900
/ 1800
|
3+1
Class 4
|
-
|
Philips
|
Fisio
611
|
Q1
2002
|
-
|
3+1
Class 10
|
-
|
Philips
|
Fisio
612
|
Q1
2002
|
-
|
3+1
|
-
|
Pretec
|
CompactGPRS
PC Card
|
Available
|
900
/ 1800
or 900 / 1900
|
-
|
Website
|
RIM
|
BlackBerry
|
Available
|
900
/ 1800
or 1900 only
|
1+1
or 2+1
|
Website
|
Sagem
|
MW959
|
Available
|
900
/ 1800
|
2+1
or 3+1
|
Website
|
Sagem
|
MW950
|
Available
|
900
/ 1800
|
3+1
|
-
|
Samsung
|
SGH-Q200
|
Available
|
900
/ 1800
|
-
|
-
|
Samsung
|
SGH-Q100
|
Available
|
900
/ 1800
|
4+1
|
Website
|
Sendo
|
Z100
|
Q4
2001
|
900
/ 1800
1900
|
3+2
Class 8
|
-
|
Sierra Wireless
|
AirCard®
700
PCMCIA
|
Q4
2001
|
-
|
-
|
Website
|
Sierra Wireless
|
AirCard®
710
PCMCIA
|
Q4
2001
|
1900
|
4+4
class 12
|
Website
|
Sierra Wireless
|
AirCard®
750
PCMCIA
|
Q1
2002
|
900
/ 1800
1900
|
4+4
class 12
|
Website
|
Sierra Wireless
|
SB
750
|
Q1
2002
|
900
/ 1800
1900
|
4+4
class 12
|
Website
|
Sharp
|
Zaurus
|
Q4
2001
|
-
|
-
|
-
|
Siemens
|
MC35
Cellular Engine
|
Q4
2001
|
EGSM900
GSM1800
|
4+1
|
Website
Data Sheet Available
|
Siemens
|
S45
|
Available
|
EGSM900
GSM1800
|
3+1
4+1 in Q1/02
|
Website
|
Siemens
|
SX45
|
Available
GPRS -Q1 2002
|
900
/ 1800
|
4+1
|
Website
|
Siemens
|
ME45
|
Available
|
EGSM900
GSM1800
|
3+1
4+1 in Q4
|
Website
|
Trium
|
Geo
GPRS
|
Q4
2001
|
900
/ 1800
|
2+1
|
Website
|
Trium
|
Mondo
|
Available
|
900
/ 1800
|
2+1
|
Website
|
Wavecom
|
WISMO2C
|
Q4
2001
|
900
/ 1800
900 / 1900
|
2+1,
then 4+2
|
Website
|
Wavecom
|
WMOi3
|
-
|
900
/ 1800
900 / 1900
|
4+2
|
Website
|
Web Tech Wireless
|
Wireless
Locator L2000
|
Available
|
900
/ 1800
1900
|
Class
1, 2, 4
|
Website
Data Sheet Available
|
Web Tech Wireless
|
Wireless
Connector i1000
|
Available
|
900
/ 1800
1900
|
Class
1, 2, 4
|
Website
Data Sheet Available
|
Xircom
|
PCMCIA
modem
|
Q1
2002
|
-
|
4+2
|
Website
|
|