CN100466645C - 一种根据不同承载网络类型实施不同业务处理的方法 - Google Patents

一种根据不同承载网络类型实施不同业务处理的方法 Download PDF

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Publication number
CN100466645C
CN100466645C CNB2004100584555A CN200410058455A CN100466645C CN 100466645 C CN100466645 C CN 100466645C CN B2004100584555 A CNB2004100584555 A CN B2004100584555A CN 200410058455 A CN200410058455 A CN 200410058455A CN 100466645 C CN100466645 C CN 100466645C
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network
functional entity
bearer network
control layer
business
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CN1738303A (zh
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武亚娟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2005/001273 priority patent/WO2006017985A1/zh
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Abstract

本发明公开了一种根据不同承载网络类型实施不同业务处理的方法，该方法包括：A、业务控制层中的功能实体获取当前用户设备使用的承载网络类型信息；B、业务控制层中的该功能实体根据该承载网络类型信息确定承载网络类型，实施不同的业务处理。该方法能够让IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型，从而根据不同承载网络类型实施不同的业务处理。

Description

一种根据不同承载网络类型实施不同业务处理的方法
技术领域
本发明涉及了在业务控制网络中实施不同业务处理的技术，特别涉及一种在业务控制网络中根据不同承载网络类型实施不同业务处理的方法。
背景技术
随着宽带网络的发展，移动通信系统开展的业务将不仅仅局限于传统的语音通信，结合音频、视频、图片和文本等多种媒体类型的多媒体业务将逐渐开展起来。多媒体业务包括呈现业务(presence)、短消息、网页(WEB)浏览、定位信息、推送业务(PUSH)、文件共享等和上述数据业务的结合，可以满足用户的多种需求。
在多媒体多种应用的推动下，第三代移动通信标准化的伙伴项目(3GPP)标准组织推出了基于IP的多媒体子系统(IMS)架构，目的是在无线通信系统中使用一种标准化的开放结构来实现多种多样的多媒体应用，提供给用户更多的选择和更丰富的感受。
在3GPP版本5(R5，Release5)阶段，引入了IP多媒体子系统域，简称IMS，叠加在分组交换网络之上。IMS由呼叫状态控制功能(CSCF)、媒体网关控制功能(MGCF)、媒体资源功能(MRF)和归属签约用户服务器(HSS)等功能实体组成，其中CSCF又可以分成服务CSCF(S-CSCF)、代理CSCF(P-CSCF)和查询CSCF(I-CSCF)三个逻辑实体。S-CSCF是IMS的业务交换中心，执行会话控制，维持会话状态，负责管理用户信息，产生计费信息等；P-CSCF是终端用户接入IMS的接入点，完成用户注册，负责QoS控制和安全管理等；I-CSCF负责IMS域之间的互通，管理S-CSCF的分配，对外隐藏网络拓扑和配置，产生计费数据等。MGCF控制网关，实现IMS网络和其它网络的互通，MRF提供媒体资源，如收放音，编解码和多媒体会议桥。HSS是用户数据库，存储IMS用户的签约数据和配置信息等。IMS中使用会话发起协议(SIP)协议作为会话控制协议。
到了3GPP R6阶段，在完成了IMS基本框架结构的基础上，开始进一步完善IMS网络作为一个承载与控制分离、控制与应用分离的分层网络。由于IMS做到了业务控制与承载网络接入方式的无关性，因此，在R6阶段很多其他类型的网络也开始考虑使用IMS作为业务控制网络，比如3GPP2的分组网络，使用WLAN接入的网络以及使用固定连接接入的NGN等。因此，3GPP定义的IMS网络也可以应用于其他分组交换网络之上，提供和多种承载类型网络的互通，实现和用户使用终端类型的无关性。
以下简单介绍一下IMS网络可以叠加的承载网络类型。承载网络的类型有宽带码分多址(WCDMA)网络的分组域网络、CDMA2000的分组域网络、无线局域网(WLAN)和下一代网络(NGN)。
WCDMA网络的分组域包括通用分组无线业务(GPRS)网络和全球移动通信系统(UMTS)网络两种，主要区别在于接入网采用的无线接入技术不同：GPRS中沿用了数字式移动通信系统(GSM)的基站系统，UMTS中升级为使用UTRAN或者从GSM演进的增强数据速率(GERAN)技术。二者的核心网部分是一样的，都包括网关GPRS支持节点(GGSN，GatewayGPRS Supporting Node)和服务GPRS支持节点(SGSN，Serving GPRSSupporting Node)。
GGSN在WCDMA网络和公用数据网之间起关口的作用，它可以和多种不同的数据网络连接，如互联网、公共陆地移动系统(PLMN)和局域网(LAN，Local Area Network)等。SGSN记录移动台的当前位置信息，并在移动台和各种数据网络之间完成移动分组数据的发送和接收，为服务区内所有移动台提供双向的分组路由。SGSN和GGSN之间的接口基于GRPS隧道协议(GTP GPRS Tunnel Protocol)，实现隧道传输功能。
CDMA2000网络相关技术和演进是3GPP2组织提出的。在3GPP2中，也定义了类似IMS的业务控制层面，叫做多媒体域(MMD，MultimediaDomain)，其实质就是将IMS完全搬移到cdma2000网络上使用。
CDMA2000数据业务的最大特点是充分利用IP技术。在分组数据领域，3GPP2规定：分组网络的参考模型，它由分组数据服务节点(PDSN，PacketData Serving Node)/外部代理(FA，Foreign Agent)、远程用户拨号认证系统(RADIUS)和家乡代理(HA，Home Agent)等有限的几个功能实体构成；引用IETF已经发布IP标准的特殊要求；为了解决无线系统计费的特殊要求，定义了话单的格式。
除了上述内容以外，所有的具体协议都直接引用IP标准，从而将分组网络构建在IP技术基础上。其中FA和HA是移动IP(MIP，Mobile IP)要求实现的功能实体；RADIUS服务器方式完成鉴权、计费、授权服务；PDSN的地位类似UMTS中的GGSN，是无线接入网和各类分组交换公共数据网之间的网关，是CDMA2000网络中移动终端访问互联网的接入设备。
WLAN网络属于一种短距离无线通信技术，它是以无线信道为传输媒介构成的计算机局域网络，通过无线射频技术(RF，Radio Frequency)在空中传输数据、话音和视频信号。WLAN网络可以在一些特殊的应用环境中弥补依靠铜缆或光缆构成有线局域网的不足，实现网络的延伸，使个人计算机具有可移动性，能迅速、方便地解决通过有线方式不易实现网络信道的连通问题。
WLAN网络作为一种用于有限范围内的无线技术，为了能够接入到IP互联网以及应用各种多媒体业务，增加了分组数据网关(PDG，Packet DataGateway)节点。作为接入到IMS的网关设备，该节点的功能类似GGSN，这样用户经过WLAN接入时可与UMTS用户一样使用移动网业务，有多个互通层面，包括统一鉴权、计费、利用移动网提供的PS和IMS业务、不同接入方式切换时业务不中断等。
NGN作为下一代网络，是一个比较广义的概念，具有几个特点：采用统一的协议，基于分组交换；业务与呼叫控制分离，呼叫控制与承载分离；通过网关设备和现有网络实现互通。近期欧洲电信标准化协会(ETSI)TISPAN标准组织决定采用IMS作为其定义NGN的呼叫控制层面，从而也成为了IMS的一种承载网络。虽然目前的研究还没有给出具体的解决方案，但是已经明确：建立一个网关设备来接入到IMS网络中，从而可以应用现有IMS能够提供的各种业务控制能力和接入到各种外部网络的分组业务上。
因为IMS网络的业务控制层面要实现的功能很多，在此只举计费功能和本地策略控制两个实施例作为说明。
基于互联网协议(IP)流的计费(FBC，Flow Based Charging)功能，对于一个分组业务来说，用户在使用该项业务所消耗的数据量称为业务数据流(Service Data Flow)，业务数据流是多个IP流组成的集合。而在一个分组数据协议内容(PDP context)中可以承载多个不同的分组业务，因此FBC粒度可以小于基于PDP context的计费粒度，从而能够提供更为丰富的计费手段。
在3GPP的TS23.125中对FBC的系统结构、功能要求以及消息流程等方面进行了描述。其中支持在线计费的FBC系统结构如图1所示；支持离线计费的FBC系统结构如图2所示。图1和图2中所示的各个功能实体作用分别为：
传输面功能实体(TPF，Traffic Plane Function)，TPF是承载分组数据流的功能实体，其可区分属于不同业务数据流中的分组包，用于离线计费信息收集和执行在线信用控制。当承载的分组数据流发生变化时，例如承载分组数据流的建立、修改或删除过程，TPF通过Gx接口向基于业务流计费的计费规则功能实体(CRF，Service Data Flow Based Charging Rule Function)发送请求计费规则消息，消息中可以携带：用户和用户使用的终端相关信息，如移动台国际ISDN号码(MSISDN)和国际移动签约用户标识(IMSI)，承载特性如业务质量(QoS)信息，以及网络相关的信息，如移动网编码(MNC)和移动国家码(MCC)。TPF根据CRF返回的计费规则，TPF在对应的业务数据流上执行分组过滤和计费数据收集。
一个TPF可以由一个或多个CRF服务，根据用户的标识信息来选择为其服务的CRF，TPF可以支持预定义的计费规则以及预定义的过滤器。
CRF，CRF是保存有计费规则的功能实体，支持动态的计费规则，即根据业务准则实时生成一些计费规则数据，和静态的计费规则，即在用户使用数据业务过程中计费规则是一成不变的。静态的计费规则可以被动态的计费规则激活。CRF通过接收到的TPF信息，应用功能实体(AF，ApplicationFunction)信息以及在线计费系统(OCS，Online Charging System)信息作为输入，用于选取适当的计费规则，在TPF请求或者有特定事件触发的时候将选取的计费规则发送给TPF。
一个CRF可以对应多个TPF。
AF，AF代表所有和应用相关的功能实体，AF向CRF提供相应的信息使得CRF可以选择或配置相应的计费规则，AF提供的信息包括：业务数据流的标识信息，可以设置为通配，计费规则选择的信息，应用/业务标识，应用/业务计费规则触发时间，流类型，可以选择为视频或音频，流速率。
一个AF可以对应于多个CRF。AF可以根据用户的标识信息选择CRF进行交互。
OCS，OCS作为在线计费系统由业务控制点(SCP，Service Control Point)和信用控制(CC，Credit Control)两个功能实体组成，其中CC对在线计费时的用户信用进行管理。当用户使用业务时，CCF对该用户信用池中的信用进行授权，并向TPF下发用户可以使用的信用。通过Ry接口，OCS可以向CRF提供计费规则选择的输入信息。
计费网关实体/计费收集实体(CCF/CGF，Charging GatewayFunction/Charging Collection Function)，这两个功能实体是用于离线计费系统的，可以沿用现有的GPRS网络计费中的实现。
如果承载网络是GPRS网络，则TPF位于GGSN处，AF为PDN中的一个业务网关，或是业务服务器。当IP多媒体子系统(IMS)承载在GPRS网络之上时AF就是P-CSCF，CRF为新增的逻辑实体；当IP多媒体子系统(IMS)承载在3GPP2的分组网络中时，TPF就位于PDSN上；IP多媒体子系统(IMS)承载在WLAN的网络结构中时，TPF就是分组数据网关(PDG)的一个逻辑功能。
目前，根据规范23.125v610中对计费规则的定义，计费规则包含的内容有：一个特定业务数据流的计费方式：在线计费还是离线计费、在离线计费时是按流量、时长还是流量和时长进行记录、计费键、一个或者多个业务数据流过滤器、优先级以及计费规则标识。其中，业务数据流过滤器是用来区分属于一个特定业务数据流的分组数据包的，基本的构成是IP五元组，包括源IP地址，目的IP地址，源端口号，目的端口号，传输协议号或者应用协议号；计费键是用于确定费率的；优先级是在计费规则出现重叠的时候用于确定应用哪一个计费规则用的；计费规则标识是用来标识计费规则的。
在实施业务的时候，TPF根据选定的计费规则，对该业务数据流的分组数据包进行过滤，可能是以时长为单位，也可能是以流量为单位，或者以流量加时长为单位，生成承载计费信息，送给计费相关功能实体产生用户的最终话单。
在实现基于业务的本地策略控制功能时，3GPP定义了UE本地承载业务、GPRS承载业务和外部承载业务之间的交互，以及这些组合在一起为分组域端到端业务提供业务质量(QoS)。IP承载管理功能(IP BS Manager)在UE和GGSN中都可能存在，一般使用差分服务(DiffServ)或综合服务/资源预留(IntServ/RSVP)与外部IP网络进行互通。
同时，3GPP描述了为分组域提供端到端QoS的IP层必需机制，通过基于业务的本地策略控制机制实现。图3为基于业务的本地策略控制机制构架示意图：策略决策功能(PDF，Policy Decision Function)和UE通过SIP协议交互，PDF从应用服务器得到应用层如会话描述协议(SDP，SessionDescription Protocol)中的参数，将该应用层参数信息映射到IP QoS参数如RSVP中，该映射遵守特定的策略规则。PDF的决策将传送到GGSN中的IP承载管理功能，进一步通过翻译/映射功能映射到UMTS承载管理功能上，GGSN完成相应的IP策略执行点(PEP，IP Policy Enforcement Point)功能。PDF和GGSN之间的Go接口采用公共开放协议服务(COPS，Common OpenPolicy Service)协议，传送QoS相关信息和策略。
3GPP R5中只为IMS业务提供基于业务的QoS控制，所以PDF是IMS实体P-CSCF中的逻辑实体。R6阶段PDF是一个单独的功能实体，可以为所有分组域业务提供基于业务的QoS策略控制。当其他类型的承载网络要实现基于业务的策略控制的时候，PEP就在对应的网关设备上实现。当使用IMS的时候，AF就是P-CSCF中的逻辑实体。
当UE请求建立传送业务数据的承载连接时，PEP向PDF发送请求(REQ，Request)消息，其中携带客户端的对话信息，用于标识对应PDF的授权令牌以及该会话中一个或者多个流的标识。如果通过了授权，则PDF返回决定(DEC，Decision)消息给PEP，其中携带客户端的对话信息，控制层面计费标识，上下行指示，授权的QOS信息，过滤器信息以及对应的通道是否打开的状态信息。然后GGSN会根据DEC的执行情况，返回报告(RPT，Report)消息给PDF，报告执行的结果等。
通过对现有IMS网络和承载网络之间，即现有业务控制层和承载网络之间在计费和策略控制方面的实现机制可以看到：为了实现业务控制和承载的无关性，网关功能实体和业务控制层上对应的功能实体之间都没有传送任何承载网络相关的信息，这一方面是好处，另一方面也造成了一些信息的缺失，比如，关于承载网络类型的信息。
IMS网络最初出现的时候，只是给UMTS一种类型的网络使用的，因此，不需要GGSN向IMS中的功能实体上报任何承载网络类型信息，因为只有UMTS一种类型，但是当IMS扩展到可以应用在多种类型的承载网络上的时候，在实施某个业务的过程中，运营商需要知道这个业务具体是承载在哪个网络上的。这是因为不同的承载网络，在计费、服务质量、安全等方面的要求还是会有所区别的，即使理论上没有区别，运营商也可能需要根据自己的运营策略，制定对应的业务模式。比如，在第三代移动通信(3G)网络发展初期，为了鼓励用户使用3G网络，培养用户习惯等，运营商就希望使用UMTS网络的用户要比使用WLAN网络的用户收费要低一些。
此外，分析现有UMTS分组交换网络的实现：由于UMTS网络中的接入网使用了多种接入技术，包括WCDMA和从GSM演进的增强数据速率(EDGE)，以后还会有时分同步的码分多址(TD-SCDMA)技术等，所以，核心网为了在计费、服务质量等方面针对不同接入网进行不同的处理，目前核心网可以得到接入网传送的无线接入技术类型相关的信息(RAT type，Radio Access Technologies type)。由此进行推理，当IMS网络扩展到可以应用在多种类型的承载网络上时，有关承载网络类型的信息也需要让IMS网络业务控制层中的相关功能实体知道，从而针对不同的承载网络能够实施不同的业务处理。
因此，如何让IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型，从而根据不同承载网络类型实施不同的业务处理，成为了亟待解决的问题。
发明内容
有鉴于此，本发明的主要目的在于提供一种在业务控制网络中根据不同承载网络类型实施不同业务处理的方法，该方法能够让IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型，从而根据不同承载网络类型实施不同的业务处理。
根据上述目的，本发明的技术方案是这样实现的：
一种根据不同承载网络类型实施不同业务处理的方法，该方法包括：
A、业务控制层中的功能实体获取当前用户设备所使用的承载网络的类型信息；B、业务控制层中的该功能实体根据该承载网络的类型信息确定承载网络类型，实施不同的业务处理。
当承载层中的功能实体和业务控制层中对应的功能实体之间存在业务控制接口并且该接口用于承载过程的业务控制处理时，步骤A所述的承载网络的类型信息是承载层的功能实体发送给业务控制层中对应的功能实体的。
步骤A所述的承载网络的类型信息预先设置在承载层的功能实体中。
步骤A所述的承载网络的类型信息是由用户设备确定并发送给承载层的功能实体的。
当承载层中的功能实体和业务控制层中对应的功能实体之间不存在业务控制接口或存在的业务控制接口不用于承载过程的业务控制处理时，步骤A所述的承载网络的类型信息是用户设备发送给业务控制层中对应的功能实体的。
所属的承载过程为承载建立过程、承载修改过程和承载删除过程。
业务控制层中的该功能实体针对不同承载网络类型设置有不同的业务处理策略；
步骤B所述确定承载网络类型之后，该方法进一步包括：业务控制层中的该功能实体根据确定的承载网络类型选择对应的业务处理策略，按照选择的业务处理策略实施不同的业务处理。
所述的业务处理包括：基于业务数据流的计费、或者基于业务的本地策略控制、或者在呼叫进行中的鉴权和授权过程。
从上述方案可以看出，由于本发明提供的方法可以由UE或者承载层提供给业务控制层当前业务所在的承载类型，所以本发明提供的方法可以用于实现业务与控制分离，控制与承载分离的下一代网络架构中，业务控制层能够根据业务所使用的承载网络的不同，实施不同的业务处理，包括计费、服务质量保证、策略控制、安全、合法监听等。通过本发明，可以在完全独立演进的业务控制层和承载层之间传递彼此有用的信息，使得具体业务的实施不但可以做到承载网络无关性，也可以根据承载网络的特点在业务控制网络中实现差异性服务。前者的无关性是出于各自独立演进，独立发展考虑，后者的差异性是针对承载网络实现技术对业务的影响考虑的，同时也能够体现运营商的运营策略。因此，该方法能够让IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型，从而根据不同承载网络类型实施不同的业务处理。
附图说明
图1为支持在线计费的FBC系统结构图。
图2为支持离线计费的FBC系统结构图。
图3为基于业务的本地策略控制机制构架示意图。
图4为本发明的IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型的一个实施例流程图。
图5为本发明的IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型的另一个实施例流程图。
图6为本发明在进行基于业务数据流的计费过程中业务控制层利用承载网类型信息进行不同业务处理的流程图。
图7为本发明承载层修改时触发的重新授权过程的流程图。
图8为本发明在进行基于业务的本地策略控制过程中业务控制层利用不同承载网类型信息进行不同业务处理的流程图。
图9为本发明在呼叫控制过程中业务控制层利用不同承载网类型信息进行不同业务处理的示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚明白，以下举实施例并参照附图，对本发明进行进一步详细说明。
本发明考虑到承载网络对业务实施在某些方面会产生一定的影响，因此需要IMS网络业务控制层中的相关功能实体知道目前实施的业务所使用的承载网络类型。
本发明当承载层和业务控制层存在业务控制接口时，可以通过用户利用承载网络第一次和业务控制层中的相关功能实体建立联系时通知给相关功能实体。图4为本发明的IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型的一个实施例流程图，其具体步骤为：
步骤400、UE向承载层中相应的功能实体发起承载建立请求，为使用某个业务申请承载资源；
步骤401、承载层中的该功能实体收到该请求之后，发现需要和业务控制层建立联系，那么根据本地的配置信息或者从其他功能实体得到的信息确定自己所在承载网络的类型；
步骤402、承载层中的该功能实体发送执行某个业务控制的请求消息给业务控制层对应的功能实体，该请求消息中带有承载网络类型信息；
步骤403、业务控制层对应的功能实体判断自身是否根据不同的承载网络类型设置了不同的业务控制处理，如果否，执行步骤404；否则，执行步骤405；
步骤404、业务控制层对应的功能实体不需要根据承载网络类型进行不同的业务控制处理，直接对该业务控制请求进行相应的处理，执行业务控制之后，返回应答消息给承载层的该功能实体，执行步骤406；
步骤405、业务控制层对应的功能实体根据该请求消息中带有的承载网络类型信息确定承载网络类型，根据确定网络类型对该业务控制请求进行相应的处理，执行业务控制之后，返回应答消息给承载层的该功能实体；
步骤406、承载层的该功能实体根据业务控制层返回的应答消息，结合本地的策略和信息，返回承载建立请求的应答消息给UE。
步骤401中承载层的该功能实体在确定自己所在承载网络的类型时可以有多种实现方法，在此简单描述其中一些方法：
方法一：在建立网络时预先将该功能实体所在的承载网络类型设置在该功能实体上，当该功能实体需要和控制层面功能实体交互消息的时候，直接将该信息填入对应的消息中；
方法二：UE在选择承载网络接入到业务控制层时，将选定的承载网络类型信息放在承载建立请求消息中一起送给和业务控制层有交互的承载层中的该功能实体，该功能实体直接利用该信息；
方法三：承载层的该功能实体不需要显式的携带承载网络类型送给业务控制层的功能实体，两个层面的功能实体在交互的信息中有一些参数就可以指示承载网络的类型是什么。
有的网络配置中，承载层和业务控制层之间不存在直接的业务控制接口，或者存在的业务控制接口不用于承载建立过程中的业务处理。那么UE可以通过承载层协议建立承载面连接之后，利用该连接直接和业务控制层交互，承载层直接透传业务控制层消息，在该消息中，用户设备将承载网络的类型信息直接通知给业务控制网络，如图5所示，图5为本发明的IMS网络业务控制层中的相关功能实体确定当前承载网络的网络类型的另一个实施例流程图，其具体步骤为：
步骤500、UE向承载层的相应功能实体发起承载建立请求，为使用某个业务申请承载资源；
步骤501、承载层的该功能实体收到该请求之后，根据用户在承载层的签约信息，决定接受这个承载建立请求，返回承载建立接受消息；
步骤502、UE根据自己请求的业务确定承载网络类型相关信息；
步骤503、UE发送业务控制层的请求消息给业务控制层的功能实体，该请求消息中带有承载网络类型信息；
步骤504、业务控制层对应的功能实体判断自身是否根据不同的承载网络类型设置了不同的业务控制处理，如果否，执行步骤505；否则，执行步骤506；
步骤505、业务控制层对应的功能实体不需要根据承载网络类型进行不同的业务控制处理，直接对该业务控制请求进行相应的处理，执行业务控制之后，返回应答消息给UE；
步骤506、业务控制层对应的功能实体根据该请求消息中带有的承载网络类型相关信息确定承载网络类型，根据确定网络类型对该业务控制请求进行相应的处理，执行业务控制之后，返回应答消息给UE。
业务控制层得到承载网络类型信息之后，可以在今后的业务控制执行过程中直接使用该信息，例如主动从业务控制层向承载层发送业务控制消息，其中携带的业务处理就是针对当前用户设备使用的承载网络的。
除了以上处理过程之外，在后续业务的执行过程中，如果发生了承载网络之间的切换，也需要使用类似的方法将新的承载网络类型信息通知给业务控制层。
因为业务控制层执行的业务处理种类非常多，涉及计费、安全、策略控制、服务质量保证等所有和通信网络运营有关的方面。所以，在此，就计费、策略控制以及呼叫控制的处理过程为例进行说明。
图6为本发明在进行基于业务数据流的计费过程中业务控制层利用承载网类型信息进行不同业务处理的流程图，本发明以在线计费的实现为例说明，假设使用WLAN网络作为承载网络，TPF是PDG的一个逻辑功能，在CRF处，针对WLAN网络接入和GPRS网络接入使用的计费规则是不同的，其具体步骤为：
步骤600、UE向TPF发送承载建立请求消息(Establish Bearer Serv Req)；对于WLAN，就是PDG接收到隧道建立请求消息；
步骤601、TPF向CRF请求计费规则(Request Charging Rules)，消息中携带决定CRF选择计费规则的输入信息；
对于WLAN，其中包括：使用UE的用户和UE信息，如移动签约用户ISDN号码(MSISDN)，国际移动设备标识及软件版本号(IMEISVI，nternational Mobile station Equipment Identity and Software Version Number)等；承载特征，如协商后的QoS，无线局域网的接入点名(W-APN，WLAN-Access Point Name)等；网络信息，如移动国家码(MCC，MobileCountry Code)和移动网络码(MNC，Mobile Network Code)；还有承载网络类型，即WLAN网络；
步骤602、CRF根据得到的信息来选择相应的计费规则(IdentifyCharging Rules To Install)，除了TPF带上来的承载以及用户相关的信息之外，此时CRF处可能也会得到来自AF的应用和业务相关信息以及来自OCS的信用控制相关信息；
步骤603、CRF处根据用户标识查找该用户的计费规则信息，发现相同的业务，针对WLAN承载和其他承载，如GPRS承载，应用的计费规则是不一样的，那么CRF根据承载网络类型进行选择，将应用于WLAN网络的计费规则(Provision Charging Rules)下发给TPF，作为计费规则请求消息的应答；
步骤604、TPF根据CRF提供的对计费规则的操作指示，对相应的计费规则执行应用(Perform Charging Rules Actions)；
步骤605、在线计费情况下，TPF向OCS请求信用信息(Credit Request)，消息中携带OCS决定信用所需的输入信息；
步骤606、OCS向TPF提供信用信息(Credit Response)；
步骤607、TPF向UE返回承载建立接受消息(Establish Bearer ServAccept)，UE就可以在已经建立的承载上传输数据了。
执行完步骤607之后，UE就可以在已经建立的承载上执行业务请求和数据传输了，比如请求和网络中的一个应用服务器建立业务连，传送业务请求过程、执行过程以及中止过程中所需的数据，接收来自应用服务器的信息等等，这些数据的传输都要占用承载资源。对于实现了基于业务数据流计费的承载网络来说，在TPF处，根据每个分组数据包所属的业务流的不同，TPF将应用不同的计费规则，将相关的承载计费信息上报给计费相关功能实体。
因为该业务使用的承载网络发生变化时会导致使用不同的计费规则。为了能够监控承载网络类型的变化，TPF中可以配置一些触发点，当承载网络类型发生变化时触发该触发点，在离线计费时上报给CRF或者在在线计费时上报给OCS，从而CRF或者OCS可以根据承载网络的变化情况选择不同的计费规则。图7为本发明承载层修改时触发的重新授权过程的流程图，其具体步骤为：
步骤700、TPF收到修改承载的请求消息(Modify Bearer Serv Req)；
步骤701、TPF判断此次承载的修改是否匹配重授权触发点，如果是，执行步骤703；否则，执行步骤702；
这里承载修改是从GPRS承载改为使用WLAN承载，因此匹配TPF中设置有从GPRS承载改为WLAN承载的重授权触发点；
步骤702、继续进行后续会话处理；
步骤703、TPF返回该计费规则下没有用完的信息给OCS，同时请求对该计费规则进行重新授权(Credit Control Request)；
步骤704、OCS执行重授权过程，在帐户充足的情况下，返回新的信用给TPF(Credit Control Answer)；
步骤705、TPF根据返回的信用更改计费规则，即从基于GPRS承载的计费规则改为基于WLAN承载的计费规则，并向UE发送接受此次承载修改请求(Modify Bearer Serv Accept)。
图8为本发明在进行基于业务的本地策略控制过程中业务控制层利用不同承载网类型信息进行不同业务处理的流程图，假设UE可以从WCDMA网络或者cdma2000网络中接入IMS，但是使用不同承载网络接入的时候，相同的业务，签约的QoS参数等不同，那么PDF在执行策略控制的时候，需要知道当前业务承载的承载网络类型是什么，从而选择不同的策略下发给PEP执行。其具体步骤为：
步骤800、UE发送承载建立请求给承载网络中具有PEP的功能实体，其中带有QoS参数、用于PDF寻址和标识数据流的绑定信息；
步骤801、PEP所在的功能实体发送COPS请求(COPS REQ)消息给PDF，以便获取相关的策略信息，其中带有绑定信息和能够区分承载网络类型的信息；
步骤802、绑定信息中的授权令牌使得PDF能够找到对应的授权状态信息，然后PDF通过Gq接口发送授权请求给AF；
步骤803、AF将所请求的业务信息发送给PDF，即通过Gq接口返回授权确认；
步骤804、PDF根据来自AF的信息，检查AF处的会话描述和PDF中定义的运营商策略规则是否一致，如果一致，授权所需的QoS资源，应用IP层策略；当PDF检查时，发现运营商策略规则中针对不同承载类型网络的策略规则是不一样的，则进一步根据承载网络类型信息选择对应的策略规则和AF送来的会话描述进行比较，授权对应的QoS资源，应用对应的IP层策略；如果不一致，则结束本流程；
步骤805、PDF返回COPS决定(COPS DEC)消息给PEP所在的功能实体；
步骤806、PEP所在的功能实体返回一个COPS报告(COPS RPT)消息给PDF，该过程可以触发PDF发送一个报告消息给AF；
步骤807、PEP所在的功能实体根据得到的基于IP流的策略信息将该策略映射到承载网络的承载层上，进而决定是否接受此次承载建立请求，接受的话，返回承载建立接受消息给UE；否则，结束本流程。
图9为本发明在呼叫控制过程中业务控制层利用不同承载网类型信息进行不同业务处理的示意图，如图所示：
UEA和UEB各自执行a1和b1开机过程，然后根据各自所在的承载网络类型不同，进行不同的业务处理。
UEA使用的是GPRS网络，因此发起a2GPRS附着过程，利用a3建立好的PDP上下文向应用服务器AS以及IMS核心网发起a4IMS注册请求，注册消息中可以携带用户设备当前使用的承载网络类型的信息或者和不同承载网络相关的消息扩展部分。IMS核心网根据注册消息中和用户设备所使用的承载网络相关的信息判定UEA使用的承载网络是GPRS网络，因为GPRS网络的安全性较好，因此决定仅在UEA第一次进行注册的时候对该UEA进行鉴权，以后重新注册过程都直接返回确认，不进行重新鉴权。
UEB使用的是WLAN网络，因此发起b23GPP WLAN附着过程，利用b3建立好的WLAN隧道向应用服务器AS以及IMS核心网发起b4IMS注册请求，注册消息中可以携带用户设备当前使用的承载网络类型的信息或者和不同承载网络相关的消息扩展部分。IMS核心网根据注册消息中和用户设备所使用的承载网络相关的信息判定UEB使用的是WLAN网络，而WLAN网络的安全保护比较差，因此决定在UEB第一次进行注册的时候要进行鉴权过程，在以后重新注册的时候都要进行重新鉴权过程，以确保UEB没有被伪冒。
本发明提供了一种使得业务控制网络能够根据业务所使用的承载网络类型不同而执行不同处理的方法，根据承载层和业务控制层之间是否存在直接的业务控制接口，使用不同的方法将用户设备使用的承载网络的类型信息通知给业务控制层，从而使得业务控制层能够根据承载网络的特点使用不同的计费策略，不同的服务质量，不同的安全级别等等，让运营商在实现具体应用的时候能够根据承载实施不同的业务控制，从而能够提供给用户有差异的服务，有利于细分客户群，培养用户习惯，达到提高效益的目的。
由承载层或者用户设备上报承载网络类型信息给业务控制层的这种方法比较通用，不论业务控制层上的应用层执行的是什么具体应用，都可以根据承载网络类型的不同实施不同的业务控制处理，但是并不是所有的业务控制处理都需要区分承载网络类型。因此本发明还可以由应用层的具体业务自己决定是否需要根据承载网络类型的不同实施不同的业务控制处理，如果需要，那么根据该业务能够承载的网络类型，将对应的业务控制处理从业务控制层下发给承载层对应的功能实体使用，也能够达到业务控制网络根据承载网络类型执行不同业务处理的目的。这种方法的缺点是：因为不知道底层承载的具体类型，可能需要下发多种承载网络对应的业务控制处理信息，造成信息冗余，或者下发的业务控制处理信息不适合当前使用的承载网络。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所做的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (8)

1、一种根据不同承载网络类型实施不同业务处理的方法，其特征在于，该方法包括:
A、业务控制层中的功能实体获取当前用户设备所使用的承载网络的类型信息；
B、业务控制层中的该功能实体根据该承载网络的类型信息确定承载网络类型，实施不同的业务处理。
2、如权利要求1所述的方法，其特征在于，当承载层中的功能实体和业务控制层中对应的功能实体之间存在业务控制接口并且该接口用于承载过程的业务控制处理时，步骤A所述的承载网络的类型信息是承载层的功能实体发送给业务控制层中对应的功能实体的。
3、如权利要求2所述的方法，其特征在于，步骤A所述的承载网络的类型信息预先设置在承载层的功能实体中。
4、如权利要求2所述的方法，其特征在于，步骤A所述的承载网络的类型信息是由用户设备确定并发送给承载层的功能实体的。
5、如权利要求1所述的方法，其特征在于，当承载层中的功能实体和业务控制层中对应的功能实体之间不存在业务控制接口或存在的业务控制接口不用于承载过程的业务控制处理时，步骤A所述的承载网络的类型信息是用户设备发送给业务控制层中对应的功能实体的。
6、如权利要求2或5所述的方法，其特征在于，所属的承载过程为承载建立过程、承载修改过程和承载删除过程。
7、如权利要求1所述的方法，其特征在于，业务控制层中的该功能实体针对不同承载网络类型设置有不同的业务处理策略；
步骤B所述确定承载网络类型之后，该方法进一步包括:业务控制层中的该功能实体根据确定的承载网络类型选择对应的业务处理策略，按照选择的业务处理策略实施不同的业务处理。
8、如权利要求1或7所述的方法，其特征在于，所述的业务处理包括:基于业务数据流的计费、或者基于业务的本地策略控制、或者在呼叫进行中的鉴权和授权过程。
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