Communication coding rules

. 1 numbering plan

GSM networks are complex, including switching systems and base station systems. Exchange subsystems include HLR, MSC,
Vlr, AUC, and EIR, and base station systems, other networks such as PSTN, ISDN, data network, and other plmn
. To connect a call to a mobile customer, you need to call the corresponding entity. Therefore, correct addressing is critical to the numbering plan. This chapter introduces the numbering plan of various numbers used to identify the identity in the GSM mobile communication network.

1. Mobile Station ISDN number (msisdn)

Msisdn number refers to the number that the caller needs to dial to call the Digital Public Land cellular mobile communication network. The number structure is:

Cc ndc Sn

| ----------- International mobile client ISDN number ------------------- |

| -- China's valid mobile customer ISDN number -- |

Cc = country code. Our country is 86.

NDC = domestic destination code, that is, the network access number. The GSM network of the Post and Telecommunications Department is 139, And the GSM network of China Unicom is 130.

Sn = Customer number. It adopts the same length of 7 digits.

The structure of the SN of the Ministry of Posts and Telecommunications is h1h2h3abcd, where hlh2h3 is the HLR number of each mobile service, and ABCD is the mobile customer code. The Sn Structure of China Unicom is h1h2abcde, hlh2 is the HLR Number of the mobile business region network, and ABCDE is the mobile customer code.

When the customer number capacity is limited, the domestic destination code can be expanded. The Ministry of Posts and Telecommunications can enable 138,137? _, "China Unicom Company" can enable 131,132? .

2. International Mobile customer identification code (imsi)

In order to correctly identify a mobile customer on the wireless path and the entire GSM mobile communication network, a specific identification code must be assigned to the mobile customer. This identifier is called the International Mobile customer identification code (imsi). It is used in all signals of the GSM mobile communication network and is stored in the customer identification module (SIM), HLR, and vlr.

The imsi number structure is:

Mcc mnc msin

| ------------ International Mobile customer identification ------------ |

| -- Domestic mobile customer identification -- |

MCC = Mobile country number, which consists of three digits and uniquely identifies the country to which a mobile customer belongs. China is 460.

MNC = mobile network number, composed of two digits, used to identify the mobile network that a mobile customer belongs. The GSM plmn network of the Post and Telecommunications Department is 00, and the "China Unicom Company" gsmplmn is 0l.

Msin = Mobile customer identification code, which consists of 11 digits. Uniquely identifies China Mobile clients in China's GSM mobile communication network.

3. Mobile customer roaming number (msrn)

The hlr of the called customer knows which MSC/vlr service zone the customer is currently in. To provide the MSC/vlr (gmsc) entry with a temporary number used for route selection, HLR requests the MSC/vlr in the service zone where the called customer is located to assign a mobile customer roaming number (msrn) to the called customer, send the number to HLR, and send the HLR to gmsc after receiving the number, gmsc selects a route based on this number to connect the call to the MSC/vlr Exchange Board currently accessed by the called customer. Once a route is created, this number can be released immediately. This query and call routing function (requesting an msrn function) is a program of NO. 7 signaling China Mobile Application (MAP), in gmsc? _ HLR? _ MSC/vlr question No. 7 signaling network for transmission.

The structure of the mobile customer's roaming number (msrn) is:

Cc ndc Sn

| --------- International Mobile customer ISDN No. ----------------- |

| -- Domestic mobile customer ISDN number |

China's Ministry of Posts and Telecommunications GSM mobile communication network technical system stipulates that the first msisdn number 0 after 139 is a mobile customer roaming number (msrn), namely 1390mlm2m3abc. Mlm2m3 is the MSC number. Mlm2 is the same as hlh2 in msisdn.

4. Temporary mobile customer identification code (tmsi)

To keep imsi confidential, MSC/vlr can assign a unique tmsi number to the mobile client, that is, a 4-byte BCD code allocated by MSC, only available in the MSC service area.

5. Location Code (LAI)

The Location Identification code is used to update the location of a mobile customer. The number structure is as follows:

Three digits, two digits, up to 16 bits

MCC MNC LAC

| ------------ Lai ------- |

MCC = Country Code of a mobile customer, which is the same as the first three digits in imsi.

MNC = mobile network number, same as the MNC in imsi.

LAC = location code, which is a 2-byte BCD encoded and expressed as x1x2x3x4. You can define 65536 different location zones in a GSM plmn network.

6. Global Community ID (CGI)

CGI is used to identify a residential area in a location area. It adds a residential ID (CI) after the Location Area identifier (LAI). Its structure is:

Three digits, two digits, a maximum of 16 bits, a maximum of 16 bits

Mcc mnc lac Ci

| --------------------- Lai ----- |

| --------------------------------------- CGI ------- |

CI is a two-byte BCD encoded by MSC.

7. base station identification code (bsic)

Bsic is used to identify adjacent base stations in neighboring countries. It is 6-bit encoded and its structure is:

3bit 3bit

NCC BCC

| -------- Bsic ------------- |

NCC = a national color code. It is mainly used to differentiate operators on different sides of a national border (different provinces in China). It is xy1y2.

X: Operator (Post and Telecommunications x = 1, China Unicom = 0)

Y1 and Y2: distribution is shown in Table 5-1.

Table 5-1 y1y2 allocation

Y2

Y1
0
1

0
Jilin, Gansu, Tibet, Guangxi, Fujian, Hubei, Beijing, and Susu
Heilongyi, Liaoning, Ningxia, Sichuan, Hainan, xianxi, Tianjin, Shanxi, and Shandong

1
Xinjiang, Guangdong, Hebei, Anhui, Shanghai, Guizhou, and Shaanxi
Inner Mongolia, Qinghai, Yunnan, Henan, Zhejiang, AND HUNAN

NCC = color code of the base station to identify the base station. Set by operation.

8. International mobile device identification code (IMEI)

Uniquely identifies the code of a mobile device, which is a 15-digit decimal number. Its structure is:

6 digits 2 digits 6 digits l digits

Tac fac snr sp

Tac = model approval code, which is assigned by the European model Certification Center.

FAC = factory assembly code, which is coded by the manufacturer to indicate the manufacturer and Its Assembly location.

SNR = sequential number, which is allocated by the manufacturer. Identifies a device in each TAC and FAC.

SP = standby for future use.

9. MSC/vlr number

The MSC/vlr number is used in the No. 7 signaling information, representing the MSC number. The MSC/vlr number structure in the GSM mobile communication network of China's Ministry of Posts and Telecommunications is 1390mlm2m3. among them, mlm2 is the same as hlh2.

Lo. HLR number

The HLR number is used in the No. 7 signaling information to represent the HLR number. The HLR number structure in the GSM mobile communication network of the Department of Posts and Telecommunications is the msisdn number whose customer number is completely zero, that is, 139hlh2h30000.

11. Switch the number (HON)

HON is a temporary number assigned to the mobile customer by the target MSC (that is, the MSC to be transferred) to select a route when the mobile exchange board is switched over. This number is part of the msrn number.

5.2 dialing method

Dial-up is a way for customers to implement local calls, domestic long-distance calls, and international long-distance calls by dialing decimal numbers. China's Ministry of Posts and Telecommunications mobile communication network technical system stipulates that the GSM mobile communication dialing method is:

Mobile customers & reg; Fixed customers (including simulated mobile customers) 0xyz pqr ABCD

Fixed customer & reg; 139hlh2h3abcd for local mobile customers

Fixed customer & reg; 0139hlh2h3abcd for foreign mobile customers

Mobile customer & reg; mobile customer 139hlh2h3abcd

Mobile customer & reg; waiting for service 0 xyzlxx where only 119 for fire alarms, 110 for police, 120 for emergency centers, only 122 must be allocated to the traffic police center.

International customers & reg; mobile customers international long distance title + 139hlh2h3abcd

Mobile customer & reg; international customer 00 + country code + valid domestic phone number

Among them, 0 = the title of the Chinese long distance.

00 = international long distance title.

XYZ = long-distance area code, which consists of three or two digits.

Pqr = Bureau number.

ABCD = Customer number. When the long-distance zone number is two digits, the customer number can consist of four or five digits.

LXX = special service number.

Because the network access number of the GSM mobile communication network is "139", "139" features both the special server number and long-distance zone number. This is because both international and domestic long distances are analyzed and "139" are connected to the GSM mobile communication network of the Department of Posts and Telecommunications. According to China's telephone network technical system, the dialing method is locked, that is, when customers call each other in a locked serial number area (a long-distance serial number area is a locked serial number area, A long-distance zone number is not required. When customers in the two lock zones call each other, the long-distance zone number of the called block area must be added. Therefore, a mobile customer calls a fixed telephone network. The customer is connected to each other in two block number areas. A mobile customer needs to call the long-distance zone number of the customer's location. On the contrary, when a fixed customer (including a simulated mobile customer) calls a mobile customer, it is also the customer interworking in two locks. A fixed customer should call the mobile customer's "long-distance zone number" 139, however, before the long-distance area code, you must add the long-distance character "0" to know that the number after "0" is the long-distance area code. In this way, a problem occurs, that is, no matter where a fixed customer calls a mobile customer, the customer must first dial "0139". At present, a large number of fixed customers in China's public telephone network are still non-long-distance authorized customers, in addition, because the mobile business is the same as that of the fixed-line telephone network, there will be mobile customers who have the right to call the local fixed-line telephone customer instead of the local GSM mobile communication network, this is obviously unreasonable and will cause great business losses to the office. Therefore, China's Ministry of Posts and Telecommunications mobile communication network technical system in the formulation of the GSM mobile communication network dial-up method will be fixed customers call local mobile customers and foreign mobile customers separate provisions, when calling a local mobile customer, you only need to dial 139hlh2h3abcd. At this time, 139 has the special server number feature. When calling a foreign mobile customer, you need to add a long-distance crown "0" before 139 ", in this case, 139 has the long-distance area code feature.

When a mobile customer calls a mobile customer in the same block number area, if the customer calls the customer in the above statement, only the hlh2h: ABCD is required, and no 139 is required. However, considering that the number may be expanded in the future, enable 138,137? _. Then, the customer must dial the full number (13xhlh2h3abcd) to find the only called customer on the network. Therefore, the Ministry of Posts and Telecommunications requires mobile customers to dial the full number when calling mobile customers when setting a dialing method for the GSM mobile communication network, so as to avoid changing the customer's dialing habits after the customer number is expanded in the future.

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