ebook4u.vn-00_OMA000001 GSM Fundamentals ISSUE4.0_2 pot

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved www.huawei.com Inte rnal OMA000001 GSM Fundamentals ISSUE 4.0 HUAWEI TECHNOLOGIES CO., LTD. Page 2 All rights reserved Upon completion of this course, you will be able to:  Grasp basic idea of GSM system such as frequency spectrum, frequency reuse etc.  Grasp the structure of the GSM system and the protocol used.  Grasp certain numbers that refer to BSS  Grasp the 4 kinds of channel combination and understand the idea of multi-frame.  Know some radio techniques  Get the idea of EDGE HUAWEI TECHNOLOGIES CO., LTD. Page 3 All rights reserved References  BSS Feature Description  BSS Signaling Analysis Manual  BSC Technical Manual HUAWEI TECHNOLOGIES CO., LTD. Page 4 All rights reserved Chapter 1 GSM System Overview Chapter 1 GSM System Overview Chapter 2 GSM Network Structure Chapter 2 GSM Network Structure Chapter 3 Chapter 3 Service Area and Number Planning Service Area and Number Planning Chapter 4 Chapter 4 Channels on the Wireless Interface Channels on the Wireless Interface Chapter 5 Radio Techniques Chapter 5 Radio Techniques Chapter 6 GPRS & EDGE Introduction Chapter 6 GPRS & EDGE Introduction HUAWEI TECHNOLOGIES CO., LTD. Page 5 All rights reserved GSM system overview  The GSM system is a frequency- and time-division cellular system, each physical channel is characterized by a carrier frequency and a time slot number  Cellular systems are designed to operate with groups of low-power radios spread out over the geographical service area. Each group of radios serve MSs presently located near them. The area served by each group of radios is called a CELL  Uplink and downlink signals for one user are assigned different frequencies, this kind of technique is called Frequency Division Duplex (FDD)  Data for different users is conveyed in time intervals called slots , several slots make up a frame. This kind of technique is called Time Division Multiple Access (TDMA) HUAWEI TECHNOLOGIES CO., LTD. Page 6 All rights reserved GSM Development Standard Protocol for GSM take effect System was named as Global System for Mobile Communication GSM system began to provide service in Europe(2G) Provide services for the whole world Micro Cell Technique is used in GSM system 1989 1991 1992 1994 1996 HUAWEI TECHNOLOGIES CO., LTD. Page 7 All rights reserved Cell Technique  A certain radio coverage area formed by a set of transceivers that connected to a set of antennas is called a CELL.  Macro Cell  In the beginning , High-Power BTSs are adopted to provide services. The BTS covers a wider area , but its frequency utilization is not efficient. So , it can only provide a few channels for subscribers.  Micro Cell  Later the Low-Power BTS joins the system for getting a better service area with high capacity . At the same time it adopts the frequency reuse technique to improve the efficiency of the frequency utilization and also the whole capacity of the network. Macro Cell and Micro Cell Macro Cell and Micro Cell HUAWEI TECHNOLOGIES CO., LTD. Page 8 All rights reserved Multiple Access Technique  Multiple Access Technique allows many subscribers to use the same communication medium.  There are three kinds of basic Multiple Access Technique : FDMA , TDMA and CDMA.  GSM system adopt FDD-TDMA (FDMA and TDMA together). HUAWEI TECHNOLOGIES CO., LTD. Page 9 All rights reserved FDMA  FDMA uses different frequency channels to accomplish communication.  The whole frequency spectrum available is divided into many individual channels (for transmitting and receiving) ， every channel can support the traffic for one subscriber or some control information. Frequency Time HUAWEI TECHNOLOGIES CO., LTD. Page 10 All rights reserved TDMA  TDMA accomplishes the communication in different timeslot.  A carrier is divided into channels based on time. Different signals occupy different timeslots in certain sequence , that is , many signals are transmitted on the same frequency in different time. Time Frequency [...]... Point Available Downlink Frequency GSM 450 450.4~457.6 460.4~467.6 Fu(n)=450.6+0.2(n259) 259 . 8 50 824 ~849 869~894 Fu(n)= 824 .2 +0. 2( n- 128 ) 128 <=n< =25 1 Fd(n)=Fu(n)+45 E -GSM 900 8 80~ 915 925 ~9 60 Fu(n)=8 90+ 0.2n Fu(n)=8 90+ 0 .2( n- 1 02 4) 0& lt;=n<= 124 975<=n<= 1 02 3 Fd(n)=Fu(n)+45 R -GSM 900 876~915 921 ~9 60 Fu(n)=8 90+ 0.2n Fu(n)=8 90+ 0 .2( n- 1 02 4) 0& lt;=n<= 124 955<=n<= 1 02 3 Fd(n)=Fu(n)+45 PCS. 900 876~915 921 ~9 60 Fu(n)=8 90+ 0.2n Fu(n)=8 90+ 0 .2( n- 1 02 4) 0& lt;=n<= 124 955<=n<= 1 02 3 Fd(n)=Fu(n)+45 PCS 1 900 18 50~ 19 10 19 30~ 19 90 Fu(n)=18 50. 2 +0. 2( n- 5 12) 5 12& lt;=n<=8 10 Fd(n)=Fu(n)+ 80 HUAWEI. Frequency GSM 4 50 4 50. 4~457.6 4 60. 4~467.6 Fu(n)=4 50. 6 +0. 2( n- 25 9) 25 9<=n< =29 3 Fd(n)=Fu(n)+ 10 GSM 4 80 478.8~486 488.8~496 Fu(n)=479 +0. 2( n- 306 ) 306 <=n<=3 40 Fd(n)=Fu(n)+ 10 GSM 8 50 824 ~849 869~894 Fu(n)= 824 .2 +0. 2( n- 128 ) 128 <=n< =25 1