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All 3G and GSM specifications have  a 3GPP specification number consisting of 4 or 5 digits. (e.g. 09.02 or  29.002). The first two digits define the series as listed in the table below.  They are followed by 2 further digits for the 01 to 13 series or 3 further  digits for the 21 to 55 series. The term "3G" means a 3GPP system  using a UTRAN radio access network; the term "GSM" means a 3GPP  system using a GERAN radio access network. (Thus "GSM" includes  GPRS and EDGE features.)    A specification in the 21 to 35 series may apply either  to 3G only or to GSM and 3G. A clue lies in the third digit, where a  "0" indicates that it applies to both systems. For example, 29.002  applies to 3G and GSM systems whereas 25.101 and 25.201 apply only to 3G.  Most specs in all other series apply only to GSM systems. However, as the  spec numbering space has been used up, this guide is more frequently broken,  and it is necessary to examine the information page for each spec (see the  table below) or to check the lists in 01.01 / 41.101 (GSM) and 21.101 (3G)  for the definitive specification sets for each system and each Release.           所有3G和GSM规范具有一个由4或5位数字组成的3GPP编号。（例如：09.02或29.002）。前两位数字对应下表所列的系列。接着的两位数字对应01-13系列，或3位数字对应21-55系列。词"3G"意味着采用UTRAN无线接入网的3GPP系统，词"GSM" 意味着采用GERAN无线接入网的3GPP系统（因而，"GSM"包括GPRS和EDGE性能）。        21-35系列规范只用于3G或既用于GSM也用于3G。第三位数字为"0"表示用于两个系统，例如29.002用于3G和GSM系统，而25.101和25.201仅用于3G。其它系列的大多数规范仅用于GSM系统。然而当规范编号用完后，须查看每个规范的信息页面（见下表）或查看01.01 / 41.101 (GSM) 和21.101 (3G) 中的目录。

Subject of specification series   规范系列主题	3G/GSM R99   and later   3G/GSM R99 或以后	GSM only   (Rel-4 and  later)   仅GSM   (Rel-4 或以后)	GSM only   (before Rel-4)   仅GSM   (Rel-4以前）
General information (long defunct)   一般信息			00 series
Requirements   要求	21 series	41 series	01 series
Service aspects ("stage 1")   业务方面（“阶段1”）	22 series	42 series	02 series
Technical realization ("stage 2")   技术实现（“阶段2”）	23 series	43 series	03 series
Signalling protocols ("stage 3") - user  equipment to network   信令协议（“阶段3“）：用户设备-网络	24 series	44 series	04 series
Radio aspects   射频方面	25 series	45 series	05 series
CODECs   编解码	26 series	46 series	06 series
Data   数据	27 series	47 series   (none exists)   （不存在）	07 series
Signalling protocols ("stage 3") -(RSS-CN   信令协议（“阶段3”）：(RSS-CN	28 series	48 series	08 series
Signalling protocols ("stage 3") -  intra-fixed-network   信令协议（“阶段3”）：与固定网络之间	29 series	49 series	09 series
Programme management   程序管理	30 series	50 series	10 series
User Identity Module (SIM / USIM)   用户识别模块 (SIM / USIM)	31 series	51 series	11 series
O&M   运营和维护	32 series	52 series	12 series
Access requirements and test specifications   接入要求和测试规范		13 series (1)	13 series (1)
Security aspects   安全方面	33 series	(2)	(2)
SIM and test specifications   SIM和测试规范	34 series	(2)	11 series
Security algorithms (3)   加密算法	35 series	55 series	(4)
Note (1): The 13 series GSM  specifications relate to European-Union-specific regulatory standards. On the  closure of ETSI TC SMG, responsibility for these specifications was  transferred to ETSI TC MSG, (Mobile Specification Group) and they do not  appear on the 3GPP file server.   Note (2): The  specification of these aspects are spread throughout several series.   Note (3): Algorithms  may be subject to export licencing conditions. See the relevant 3GPP page.  See also the relevant ETSI pages.   Note (4): The original  GSM algorithms are not published and are controlled by the GSM Association.      注释（1）：13系列GSM规范与欧盟规范管理标准有关。这些规范由ETSI TC MSG,  (Mobile              Specification Group)负责，不出现在3GPP文件中。   注释（2）：这方面的规范分散在几个系列中。   注释（3）：算法可能受出口许可条件的限制，参见相关的3GPP网页或ETSI网页。   注释（4）：最初的GSM算法没有公开，由GSM协会控制。