GSM3.40_2012

合集下载

GSM系统优化

C2小区重选参数
C2=C1 + cell_reselect_offset - temporary_offset¬H (penalty_time-T) (for penalty time < 31) C2=C1 - cell_reselect_offset (for penalty time = 31) 其中： H=0,当penalty time - T < 0 H=1,当penalty time - T > 0 T为邻小区进入MS测量报告前6个小区的时间长度
●接续失败分析及优化建议 ●室内覆盖信号泄露分析和优化建议
15
网络实测指标
● Rxlev(sub) ● Rxqual(sub) ● TA ● Power control level ● CMCC
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信号电平Rxlev(sub)分析
信号电平是影响话音质量和网络统计指标的主要原
因之一。考虑到室内信号一般要比室外低15dB左右，及
19
功率控制分析
从测试统计可以得到手机的发射功率，分析发射功率的分布可以了解功率控制策略是否成功。
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覆盖分析——过覆盖
过覆盖
21
覆盖分析——覆盖混乱区域
覆盖混乱
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覆盖分析——欠覆盖
欠覆盖
23
覆盖分析——天线接错
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覆盖分析——待确认
? 是经纬度不对还是信号反射
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过覆盖造成的孤岛
29
掉话分析
30
接续失败分析 Start 25 call(01-8-15 16:50:06): :IMMEDIATE ASSIGNMENT <Begin To Call> :CM SERVICE REQUEST :CM SERVICE ACCEPT :Setup

诺基亚GSM基站培训

基本操作接口单元（BOIx）
BTS初始化和自检配置操作与维护（O&M)功能软件下载与存储主时钟功能定时功能内部与外部告警的收集与管理通过传输单元向BSC发送信息机柜及各单元控制
电源单元（PSWx）－1
将输入的交流或直流电转换为不同单元所需的直流电监控输入电压，如果输入电压超出范围，向BOIx发出输入告警监控输出电压与电流，如果任何输出电压低于限定值，向BOIx发出输出告警监控输出电压，如果输出电压超过限定的过压保护值，断开输出电压，并向BOIx告警监控自身的内部温度
2 路分集 4 路分集 ( 稍后实现)
Single branch w/o MHA
-110.5 dBm
GSM 900
GSM 1800
-111.0 dBm
Single branch with MHA
-111.0 dBm
-112.0 dBm
Combiner by-pass
WBC 2:1
输出功率
OSS：操作控制、维护管理主要管理项目及功能单元：移动用户管理计费管理移动设备管理安全性管理移动网络管理 OMC：网络监视、操作无线规划交换系统管理性能管理
诺基亚GSM系列基站架构_Ultrasite
电源单元 DC (0-3) AC (0-2)
宽带合路器（WCxx）
合成来自两个TSxx单元的发送（TX）信号，并将合成的信号提供给DVxx单元的TX端口根据频带，可提供三种版本的WCxx: GSM900： WCGA GSM1800：WCDA GSM1900：WCPA
远程调谐合路器单元（RTxx）
BSC处自动调节，无需现场访问双工操作是标准功能部件（分区的RX和TX分支集成到一个天线）通过D2总线向BOIx发送监控告警 SW存储在非易失性存储器中可以远程获得单元的HW和SW版本信息 RTxx在双工滤波器的RX分支内包含一个低和高增益的LNA RTxx包含一个RX滤波器及一个低增益和高增益LNA链用于分集接收机支持非跳频和BB跳频模式

GSM手机射频性能标准

IF=100kHz 带宽：200kHz
接收中频放大滤波
增益可编程：
78dB 2dB step
IF 混频、I/Q 解调
－>67.708kHz 模拟I/Q信号
接收镜像抑制 RF混频 RF Mixer
射频
模拟基带I/Q
信号滤波部分
模拟基带信号A/DC及滤波
GMSK解调、维特比信道均衡、解密、去交织、信道解码
语音解码： RPE-LTP 解压缩、数字音频滤波、D/AC
模拟音频放大滤波
2.GSM的基本框架_发射.
模拟音频放大、滤波
AD/C 模数变换及数字音频滤波
数字信号处
理部分
话音压缩编码 R P E - LT P ：
13kbps
基射
信道编码、交织、带频
加密、突发脉冲形
成、GMSK调制模拟基带I、Q信号
频率误差 FREQUENCY ERROR
4.相位误差（均方根值和峰值）PHASE_ERROR
峰值相位（PEAK）误差应不超过 ±20
均方根值（RMS）对每个突发小于±5°
5.调制频谱 Spectrum to Modulation
CMU200测试图,要求都在模板内,有一定度余量.
6.开关频谱 Spectrum to Switching CMU200测试图,要求都在模板内,有一定度余量.
1.功率 POWER
PCL N
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 N/A
GSM850/900 Power limit(dbm)
33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 N/A

GSM3.40_2012

珠海东信和平
短信下行SMS Deliver(SC->MS)
基本参数:
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珠海东信和平
例: SMS Deliver简单TLV格式
8B 11 24 04812143 7F F6 21211241030080 03 414243
UD UDL SCTS DCS PID
+---+---+---+---+---+---+---+---¦
1¦
¦
+---+---+---+---+---+---+---+---¦
2¦
¦
+---+---+---+---+---+---+---+---¦
3¦
¦
+---+---+---+---+---+---+---+---¦
4¦
¦
+---
---¦
半字节表示法（7字节）：年月日时分秒时区
Example: 21 21 12 41 03 00 80
表示2012年12月21日14时30分00秒GMT+8时区
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TP-UD
当UDHI=1：
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珠海东信和平
基本服务功能:
SM MT
短信下传
服务中心(SC)
5 Initials 10/13/2023

手机射频测试指导

第四章其余测试补充 ..................................................................................................38
4.1 RC 滤波电路对 PA－RAMP 的影响 .....................................................................38 4.2 PA 匹配调整 .................................................................................................................42 4.3 天线开关指标测试 .....................................................................................................42
GSM 手机射频测试指导
GSM 手机射频测试指导
目录
目录
序言 .........................................................................................................................................2
第二章发射机指标及其测试 ...................................................................................6
2.1 发射载波峰值功率 ......................................................................................................6 2.2 发射载频包络 .............................................................................................................11 2.3 调制频谱（Spectrum Due to Modulation） .........................................................15 2.4 开关频谱（Spectrum Due to Switching） ............................................................18 2.5 频率误差（Frequency Error） ................................................................................20 2.6 相位误差（Phase Error） .........................................................................................22 2.7 传导杂散骚扰（Conduct Spurious Emissions）.................................................24 2.8 发射峰值电流和平均电流........................................................................................27

gsm

SIM

另外，在SIM卡上还存在有鉴权算法（A3）、加密密钥生成算法（A8）和PIN（个人标识号）。其中，PIN码是为了防止非法用户盗用SIM卡的一种本地安全机制，即无需GSM网络的参与。 PIN码的长度可以是4—8位十进制数，并可随时更改。用户通过手机终端输入PIN码，输入的码数将与存储在EEPROM中的参数PIN码进行比较，若连续3次不一致，则SIM卡将被自锁，自锁的卡不能发送TMSI（临时移动用户识别码）和IMSI，即无法正常使用，从而起到防止非法用户盗用的目的。
GSM系统的匿名机制

为保证用户身份的机密性，对用户的鉴权成功后，网络为用户分配临时移动用户标识TMSI来代替国际移动用户标识IMSI，使第三方无法在无线信道上跟踪GSM用户。TMSI(临时用户识别码)在 GSM03.03中定义，只有在某个VLR范围内有意义，必须和LAI（位置区域标识符）一起使用。 VLR负责管理合适的数据库来保存TMSI和IMSI 之间的对应关系。当TMSI认证失败或旧的VLR不可达时，网络请求MS发送IMSI，利用IMSI重复认证步骤。这时IMSI以明文形式在空中传输，这是系统的一个漏洞。
一、GSM组成
SIM
BSC
HLR HL
VLR
R MSC
pstn等
手机
BSC EIR LR
Au C
移动终端：分为车载型，便携型和手持型３种。移动终端通过无线接口接入到GSM网网络。移动终端的一个重要组成部分是SIM 卡。该卡包含用户信息，也包含鉴权和加密信息，每个移动终端都有自己的全球唯一的识别IMEI（国际移动设备标识），网络通过对IMEI的检查，可以保证移动终端的合法性。
SIM

GSM安全技术

GSM简介 GSM全名为：Global System for Mobile Communications，中文为全球移动通讯系统，俗称"全球通"，是一种起源于欧洲的移动通信技术标准，是第二代移动通信技术，其开发目的是让全球各地可以共同使用一个移动电话网络标准，让用户使用一部手机就能行遍全球。

目前，中国移动、中国联通各拥有一个GSM网，为世界最大的移动通信网络。

除了提供基本的语音和数据通信业务外，它还提供各种增值业务和承载业务。

它采用FDMA/TDMA接入方式以及扩频通信技术，从而提高了频率的复用率，同时，也增强了系统的干扰性。

GSM 主要采用电路交换。

它主要提供鉴权和加密功能，在一定程度上确保用户和网络的安全。

GSM安全性体现在两个方面：认证和加密。

通过认证，防止没有授权的用户使用网络资源；通过加密，保证用户数据和信令数据的机密。

GSM系统的安全体系结构由3层构成：认证层、密钥产生层、加解密层。

认证层完成网络对合法用户的认证，密钥产生层用通过一定算法产生初始密钥为加解密层提供密钥，加解密层用序列密码算法A5实现对数据和信令的加解密。

GSM具体通过以下方面来实现它的安全性。

2．1用户身份的安全措施用户身份的安全措施有以下几个方面：用户身份的机密性，用户身份的认证，用户信息和信令信息的机密性。

2．1．1采用临时号码TMSI来保证用户身份的机密性GSM系统为每个移动用户分配一个唯一的国际移动用户识别码(IMSI)。

它存储于SIM卡的EPROM中，这个身份一旦被非法用户利用就可能对用户和运营商带来损失。

GSM系统中通过采用TMSI实现用户身份的机密性。

TMSl只有临时和局部的作用，经过一段时间和跨越不同的区域时，TMSI都会进行更新，更新的频率由网络运营商设置。

在更新时，TMSI的传输采取加密方式。

为了避免混淆，所以TMSI要和位置标识符LAI一起使用。

IMSl只有在当接收到TMSI与LAI不匹配时才需要发送，一般是用户接入网络时才使用。

GSM所有频段频点

GSM frequency bandsGSM frequency bands or frequency ranges are the cellular frequencies designated by the ITU for the operation of GSM mobile phones.GSM frequency bandsThere are fourteen bands defined in 3GPP TS 45.005, which succeeded 3GPP TS 05.05:System Band Uplink (MHz) Downlink (MHz) Channel numberT-GSM-380380380.2–389.8390.2–399.8dynamicT-GSM-410410410.2–419.8420.2–429.8dynamicGSM-450450450.4–457.6460.4–467.6259–293GSM-480480478.8–486.0488.8–496.0306–340GSM-710710698.0–716.0728.0–746.0dynamicGSM-750750747.0–762.0777.0–792.0438–511T-GSM-810810806.0–821.0851.0–866.0dynamicGSM-850850824.0–849.0869.0–894.0128–251P-GSM-900900890.2–914.8935.2–959.81–124E-GSM-900900880.0–914.8925.2–959.8975–1023, 0-124R-GSM-900900876.0–914.8921.0–959.8955–1023, 0-124T-GSM-900900870.4–876.0915.4–921.0dynamicDCS-180018001710.2–1784.81805.2–1879.8512–885PCS-190019001850.0–1910.01930.0–1990.0512–810•P-GSM, Standard or Primary GSM-900 Band•E-GSM, Extended GSM-900 Band (includes Standard GSM-900 band)•R-GSM, Railways GSM-900 Band (includes Standard and Extended GSM-900 band)•T-GSM, TETRA-GSMGSM-900, GSM-1800 and EGSM/EGSM-900GSM-900 and GSM-1800 are used in most parts of the world: Europe, Middle East, Africa, Australia, Oceania (and most of Asia). In South and Central America the following countries use the following:•Costa Rica - GSM-1800•Brazil - GSM-850, 900, 1800 and 1900•Guatemala - GSM-850, GSM-900 and 1900•El Salvador - GSM-850, GSM-900 and 1900GSM-900 uses 890–915 MHz to send information from the mobile station to the base station (uplink) and 935–960 MHz for the other direction (downlink), providing 124 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used. Guard bands 100 kHz wide are placed at either end of the range of frequencies.[1]GSM-1800GSM-1800 uses 1710–1785 MHz to send information from the mobile station to the base tranceiver station (uplink) and 1805–1880 MHz for the other direction (downlink), providing 374 channels (channel numbers 512 to 885). Duplex spacing is 95 MHz. GSM-1800 is also called DCS (Digital Cellular Service) in the United Kingdom, while being called PCS in Hong Kong[2] (not to mix up with GSM-1900 which is commonly called PCS in the rest of the world.) Mobile Communication Services on Aircraft (MCA) uses GSM1800.[3]GSM-850 and GSM-1900GSM-850 and GSM-1900 are used in Canada, the United States and many other countries in the Americas.•GSM-850 uses 824–849 MHz to send information from the mobile station to the base station (uplink) and 869–894 MHz for the other direction (downlink). Channel numbers are 128 to 251.GSM-850 is also sometimes called GSM-800 because this frequency range was known as the "800 MHz band"(for simplification) when it was first allocated for AMPS in the United States in 1983.The term Cellular is sometimes used to describe the 850 MHz band, because the original analog cellular mobile communication system was allocated in this spectrum.•GSM-1900 uses 1850–1910 MHz to send information from the mobile station to the base station (uplink) and 1930–1990 MHz for the other direction (downlink). Channel numbers are 512 to 810.PCS is the original name in North America for the 1900 MHz band. It is an initialism for Personal Communications Service.•Note: Telstra in Australia uses the 850Mhz for its Next G network (3G)GSM-450Another less common GSM version is GSM-450.[4] It uses the same band as, and can co-exist with, old analog NMT systems. NMT is a first generation (1G) mobile phone system which was primarily used in Nordic countries, Benelux, Alpine Countries, Eastern Europe and Russia prior to the introduction of GSM. It operates in either 450.4–457.6 MHz paired with 460.4–467.6 MHz (channel numbers 259 to 293), or 478.8–486 MHz paired with 488.8–496 MHz (channel numbers 306 to 340). The GSM Association claims one of its around 680 operator-members has a license to operate a GSM 450 network in Tanzania. However, currently all active public operators in Tanzania use GSM 900/1800 MHz. Overall, where the 450 MHz NMT band exists, it either still runs NMT, or its been replaced by CDMA. GSM-450 is a provision, it has not seen commercial deployment.GSM frequency usage across the worldThe AmericasIn North America, GSM operates on the primary mobile communication bands 850 MHz and 1900 MHz. In Canada, GSM-1900 is the primary band used in urban areas with 850 as a backup, and GSM-850 being the primary rural band. In the United States, regulatory requirements determine which area can use which band.GSM-1900 and GSM-850 are also used in most of South and Central America, and both Ecuador and Panama use GSM-850 exclusively (Note: Since November 2008, a Panamanian operator has begun to offer GSM-1900 service). Venezuela and Brazil use GSM-850 and GSM-900/1800 mixing the European and American bands. Some countries in the Americas use GSM-900 or GSM-1800, some others use 3, GSM-850/900/1900, GSM-850/1800/1900, GSM-900/1800/1900 or GSM-850/900/1800. Soon some countries will use GSM-850/900/1800/1900 MHZ like the Dominican Republic, Trinidad & Tobago and Venezuela.In Brazil, the 1900 MHz band is paired with 2100 MHz to form the IMT-compliant 2100 MHz band for 3G services.The result is a mixture of usage in the Americas that requires travelers to confirm that the phones they have are compatible with the band of the networks at their destinations. Frequency compatibility problems can be avoided through the use of multi-band (tri-band or, especially, quad-band), phones.Europe, Middle East and AsiaIn Europe, Middle East and Asia most of the providers use 900 MHz and 1800 MHz bands. GSM-900 is most widely used. Fewer operators use DCS-1800 and GSM-1800. A dual-band 900/1800 phone is required to be compatible with almost all operators. At least the GSM-900 band must be supported in order to be compatible with many operators.Multi-band and multi-mode phonesToday, most telephones support multiple bands as used in different countries to facilitate roaming. These are typically referred to as multi-band phones. Dual-band phones can cover GSM networks in pairs such as 900 and 1800 MHz frequencies (Europe, Asia, Australia and Brazil) or 850 and 1900 (North America and Brazil). European tri-band phones typically cover the 900, 1800 and 1900 bands giving good coverage in Europe and allowing limited use in North America, while North American tri-band phones utilize 850, 1800 and 1900 for widespread North American service but limited worldwide use. A new addition has been the quad-band phone, also known as a world phone, supporting all four major GSM bands, allowing for global use (excluding non-GSM countries such as Japan). There are also multi-mode phones which can operate on GSM as well as on other mobile phone systems using other technical standards or proprietary technologies. Often these phones use multiple frequency bands as well. For example, one version of the Nokia 6340i GAIT phone sold in North America can operate on GSM-1900, GSM-850 and legacy TDMA-1900, TDMA-800, and AMPS-800, making it both multi-mode and multi-band.Note that while the Nexus One, like many other devices on the market, may also become available in a UMTS I/II/IV or 2100/1900/850MHz combo,[5] it would still be considered tri-band UMTS, not quad-band, as the hardware is limited to supporting any 3 bands at one time. Further, as HSPA runs atop UMTS, it would not be considered a "mode" by strict definition.See also•3GPP•Cellular frequencies•OD-GPS•Roaming•UMTS frequency bands•United States 2008 wireless spectrum auctionReferences[1]Rappaport, Theodore S., Wireless Communications: Principles and Practices, 2nd Ed. Upper Saddle River, NJ: Prentice Hall, 2002. p. 554.[2]OFTA of HK, Office of the Telecommunications Authority (.hk/en/ad-comm/tsac/tsacpaper.html)[3]http://europa.eu/rapid/pressReleasesAction.do?reference=MEMO/08/220&format=HTML&aged=1&language=EN&guiLanguage=en[4]Ericsson, Nokia Eye 450 MHz GSM technology (/Sections/News/Print.aspx?NewsId=15254)[5]"Nexus One for AT&T's 3G bands likely in the works" (/2010/01/29/nexus-one-for-atandts-3g-bands-likely-in-the-works/). Engadget. 2010. .External links•GSM Coverage Maps and Roaming Information (/roaming/gsminfo/index.shtml) GSM World's listing of countries, frequencies, and roaming agreements.• - Publications - Current Coverage Maps (/gsmposter.htm) Charts of GSM/3GSM coverage and frequency usage for the world, Europe, Asia and the Americas • - History of GSM and More (/telecom-articles/History-of-GSM-and-More.html) GSM history, technology, bands, multi-band phones•3GPP Specification detail TS 05.05 (/ftp/Specs/html-info/0505.htm) Specification 3GPP TS 05.05 Radio Transmission and Reception•3GPP Specification detail TS 45.005 (/ftp/Specs/html-info/45005.htm) Specification 3GPP TS 45.005 Radio Transmission and Reception•3GPP Specifications for group: R4 (/ftp/Specs/html-info/TSG-WG--R4.htm) -Frequencies info for UMTS (TS 25.101/102/104/105)Article Sources and Contributors5 Article Sources and ContributorsGSM frequency bands Source: /w/index.php?oldid=406281515 Contributors: Aldaron, Amakader, Andros 1337, Armando82, Arteitle, BBCWatcher, Bachrach44,Beland, Blkballoon925, Bwilkins, Bwooce, Cassamine, ChrisHarris, ChrisUK, Chrisbolt, Colin Douglas Howell, Condem, Daydalaus, Desherinka, DrDeke, Enenn, Enquire, Eurolite x3, GJDR, Gaminrey, Githin, GoLLoMboje, Gordeonbleu, Guettarda, Gyrferret, Hamiltha, Improtas, Instantnood, Iwfi, Jareha, Jidanni, Jim.henderson, JohnTechnologist, Keres, Komiksulo, Kozuch,Kragen, LMB, Maksdo, Martin451, Melchoir, Mineralè, Moogle10000, Muhandes, Myscrnnm, Naddy, Nisselua, Nopetro, Notmicro, Omicronpersei8, Onorem, Otsego, Pan Camel, Patcat88,Peeperman, Pmbarros, Puelly, Puneetsohi1984, Quercus basaseachicensis, Radiojon, Rama, RobNich, Sam Hocevar, Sander123, Saxphile, Sciurinæ, Shanes, Sidonuke, Sloopjkb, Snickerdo,Starionwolf, Stephan Leeds, Stevage, Towel401, VCA, Verkhovensky, Vilpan, Yapkhs, ZorroIII, ترجمان05, 水水, 218 anonymous editsLicenseCreative Commons Attribution-Share Alike 3.0 Unported/licenses/by-sa/3.0/。

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8 Initials 7/18/2016
珠海东信和平
要点
基本服务功能

短信下行:SMS Deliver(SC>MS)
短信上行:SMS Submit (MS -> SC) TPDU 参数定义
9 Initials 7/18/2016
珠海东信和平
Hale Waihona Puke 短信下行SMS Deliver(SC->MS)
Short Message Mobile Terminated Point-to-Point
SM MO（移动台发起的短消息业务）
Short Message Mobile Originated Point-to-Point *SM MT 与SM MO 传送的信息都最多包含 140 字节
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基本参数:
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例: SMS Deliver简单TLV格式
8B 11 24 04812143 7F F6 2121124103008 0 03 41424 3 UDL UD
SCTS
DCS PID OA MTI-SRI
Length
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n+2
n+3
13 80 01 38 00 0
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31 08 10 83 00 F0
珠海东信和平
TP-PID
TP-Protocol-Identifier (TP-PID)
一些常用值设置:
0x00: Standard message
0x7F: SIM Data download
SMS TPDU标记
珠海东信和平
要点
基本服务功能
短信下行:SMS Deliver(SC->MS)

短信上行:SMS Submit (MS -> SC)
TPDU 参数定义
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短信上行SMS Submit (MS -> SC)
基本参数:
珠海东信和平
要点

基本服务功能
短信下行:SMS Deliver(SC->MS) 短信上行:SMS Submit (MS -> SC)
TPDU 参数定义
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基本服务功能:
点对点短信服务由两个基本服务体系组成：
SM MT（移动台终止的短消息业务）
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TP-DCS
TP-Data-Coding-Scheme (TP-DCS)
一些常用值设置:
0x00: 7-bit packed message
0x04: 8-bit message (unpacked)
0x08: USC2 (Unicode)
0xF6: SIM Data download
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The End
Thanks for your attention !
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TP-OA / TP-DA
LEN + TON + VALUE
注: LEN 不是后续长度; 是VALUE的字符个数
. . + ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ + 1 2 3 4 5 +---+---+---+---+---+---+---+---¦ ¦ ¦ +---+---+---+---+---+---+---+---¦ ¦ ¦ +---+---+---+---+---+---+---+---¦ ¦ ¦ +---+---+---+---+---+---+---+---¦ ¦ ¦ +-----¦ ¦ ¦ +-----¦ ............................... µ +-----¦ ¦ ¦ +---+---+---+---+---+---+---+---¦ . . Address-Length Type-of-Address + ¦ ¦ ¦ ¦ ¦ + Address-Value ¦ ¦ ¦ ¦ ¦ +
e.g. 04 e.g. 81
Addr.
e.g. 2143
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TP-OA / TP-DA
TON（地址类型）
一些常用值设置:
0xA1: 国内号码
0x91: 国际号码
0x81: 默认方式
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TP-OA / TP-DA
地址字段: 半字节表示法
n+1 +---+---+---+---+---+---+---+---¦ ¦ ¦ ¦ ¦ Digit 2 ¦ Digit 1 ¦ ¦ ¦ ¦ +---+---+---+---+---+---+---+---¦ ¦ ¦ ¦ ¦ Digit 4 ¦ Digit 3 ¦ ¦ ¦ ¦ +---+---+---+---+---+---+---+---¦ ¦ ¦ ¦ ¦ 1 1 1 1 ¦ Digit 5 ¦ ¦ ¦ ¦ +---+---+---+---+---+---+---+---¦
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TP-UD
当UDHI=1：
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TP-UD
IEI (Information Element Identifier)
一些常用tag:
0x00: 级联短信
0x70: 安全头
详细解释参见GSM03.48
点对点短信业务的技术实现
GSM 03.40
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概述
点对点短消息是GSM移动体之间传递信息的一种方式。其中要利用SC（短消息中心）作为短信的存储和转发中心，因此GSM PLMN要为SC和移动端之间的短信传输提供支持。 03.40则规定了在GSM PLMN体系中的点对点短信服务。
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例: SMS Submit简单TLV格式
8B 0E 01 00 05812143F5 00 04 04 6162636
4 UD UDL DCS PID DA MR MTI-SRR
Length
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SMS TPDU标记
短信传输层包含有以下6种服务： •SMS-DELIVER（SC→MS） •SMS-DELIVER-REPORT（ MS→SC，失败的原因，或对 SMS-DELIVER的确认） •SMS-SUBMIT（MS→SC） •SMS-SUBMIT-REPORT （SC→MS ，失败的原因，或对 SMS-SUBMIT的确认） •SMS-STATUS-REPORT（SC→MS，状态报告）
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详细取值参考GSM03.38
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TP-SCTS
TP-Service-Centre-Time-Stamp (TP-SCTS)
半字节表示法（7字节）：年月日时分秒时区
Example: 21 21 12 41 03 00 80
表示2012年12月21日14时30分00秒GMT+8时区
•SMS-COMMAND （MS→SC，命令） 7 Initials
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** PDU:协议数据单元
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Service provided by the SM-TL
SMS-DELIVER 与 SMS-SUBMIT
SMS-DELIVER
SMS-SUBMIT
MS (移动设备)
服务中心(SC)
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基本服务功能:
SM MT
短信下传
报告
MS (移动设备)
服务中心(SC)
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基本服务功能:
SM MO
短信上传
报告
MS (移动设备)
服务中心(SC)
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PDU Type repertoire at SM-TL:
珠海东信和平
要点
基本服务功能
短信下行:SMS Deliver(SC->MS) 短信上行:SMS Submit (MS -> SC)

TPDU 参数定义
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TP-MTI
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TP-UDHI