略过…
第三章 Definitions and abbreviations
Public Land Mobile Network (PLMN)//PLMN定义
A Public Land Mobile Network (PLMN) is established and operated by an admnistration or Recognized Private Operating Agency (RPOA) for the specific purpose of providing land mobile telecommunications service services to the public. A PLMN may be regarded as an extension of networks (e.g. ISDN, corporate and public PDNs, etc); it is a collection of MSCs areas in CS domain and SGSN areas for GPRS and SGSN or MME areas for EPC in PS domain within a common numbering plan (e.g. same National Destination Code) and a common routing plan. The MSCs are the functional interfaces between the fixed networks and a PLMN for call set-up in CS domain. The GGSN and the SGSN are the functional interfaces between the fixed networks and a PLMN for packet transmission in GPRS PS domain. In case of EPC PS Domain, the PDN-GW, Serving-GW and the SGSN and the MME are the functional interfaces between the fixed networks and a PLMN for packet transmission.
Functionally the PLMNs may be regarded as independent telecommunications entities even though different PLMNs may be interconnected through the ISDN/PSTN and PDNs for forwarding of calls or network information. A similar type of interconnection may exist for the interaction between the MSCs/SGSNs/MMEs of one PLMN.
红色部分描述的很清楚.就不多说了.
Core Network (CN) and Access Network (AN) //网络分为核心网和接入侧.
The PLMN infrastructure is logically divided into a Core Network (CN) and an Access Network (AN) infrastructures, as defined in TS 23.101 [11a] and TS 23.110 [11b]. The CN is logically divided into a CS domain, a PS domain and an IM subsystem, as defined in next clause. The AN are GERAN (also called BSS for GSM), UTRAN (also called RNS), E-UTRAN, as defined in clause "The Access Network".
Circuit Switched (CS) and Packet Switched (PS) Domains //核心网又分为PS(数据业务)和CS(语音业务)两部分
The CN is constituted of a Circuit Switched (CS) domain and a Packet Switched (PS) domain (which includes GPRS and EPC). These two domains differ by the way they support user traffic, as explained below.
These two domains are overlapping, i.e. they contain some common entities. A PLMN can implement only one domain or both domains.
CS Domain//核心网CS部分定义.
The CS domain refers to the set of all the CN entities offering "CS type of connection" for user traffic as well as all the entities supporting the related signalling. A "CS type of connection" is a connection for which dedicated network resources are allocated at the connection establishment and released at the connection release.
The entities specific to the CS domain are: MSC, GMSC, VLR. All the other CN entities defined in clause 4 "The basic entities of the mobile system" and not defined as PS domain specific entities (see following clause) are common to the CS and to the PS domains. In case of E-UTRAN access, there is no support for CS Domain.
PS Domain//核心网PS部分定义.
The PS domain refers to the set of all the CN entities offering "PS type of connection" for user traffic as well as all the entities supporting the related signalling. A "PS type of connection" transports the user information using autonomous concatenation of bits called packets: each packet can be routed independently from the previous one.
The entities specific to the PS domain are the GPRS specific entities, i.e. SGSN and GGSN and EPS specific entities, i.e. PDN GW, S-GW, MME, SGSN. All the other CN entities defined in clause "4 The basic entities of the mobile system" and not defined as CS domain specific entities (see previous clause) are common to the CS and to the PS domains.
IP Multimedia subsystem (IMS)//IMS部分的定义,大家都认为IMS,移动固网融合,神奇无比,实际上,只是一个小小的subsystem.不是很复杂,不要害怕.
The IM subsystem comprises all CN elements for provision of IP multimedia services comprising audio, video, text, chat, etc. and a combination of them delivered over the PS domain. The entities related to IMS are CSCF, MGCF, MRF, etc. as defined in the stage 2 of the IM subsystem TS 23.228 [34]. See TS 22.228 [27] for some service examples of IMS.
网络的大体结构定义完毕…
发表于 2009-1-8 19:04:55
