CN1849841A - 在sip切换时释放分配资源的方法 - Google Patents
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Abstract
当移动通信从第一链路切换到第二链路时,为了尽快放弃资源,响应由移动节点产生ACK信号,发起分配给第一链路的资源的释放,而不是等待刷新命令超时。
Description
技术领域
本发明涉及移动通信,具体地,涉及在使用会话发起协议(SIP)来完成的切换之后的网络资源释放。
背景技术
参考图1,双模式WLAN(无线局域网)-UMTS(通用移动电信系统)移动节点(MN)无线终端具有与WLAN和UMTS网络的IP(因特网协议)连接。与网络的IP连接表示终端上的特定物理接口与从网络使用的前缀中提取的IP地址相关。可以通过自动配置或利用例如DHCP(动态主机配置协议)的网络单元来获得IP地址。在附图中,IP1和IP2分别表示经由WLAN和UMTS网络到达MN的IP地址。
使用SIP(会话发起协议,国际工程任务组RCF 3261)信令协议,经由因特网和WLAN网络,已经在蜂窝网络的相应节点(CN)和MN无线终端之间建立了由实线表示的介质路径。例如,介质路径可以被用于发送与网络电话(VoIP)、多媒体分配和多媒体会议相关的数据分组。最初,该介质路径的最后一段是通过WLAN网络的。
发明内容
由于移动性或其它一些原因,随着MN远离WLAN网络,建立的从CN通过WLAN到MN的介质路径的质量开始劣化。MN用于检测信道质量下降的一个可能标准是层2(L2)信号强度。在这种情况下,尝试从WLAN切换到可选可用网络、以便保持CN和MN之间的介质路径对于MN是有利的。图1中示出的可选网络是UMTS网络。同样可能响应例如可选网络在白天的特定时间期间提供较低呼叫收费的了解或事件,MN自身可以发起切换。
提供给根据因特网协议(IP)而操作的通用通信链路的缺省服务质量(QoS)称为尽力而为,其中,网络单元根据先到先服务原则、无任何偏好地转发IP分组。对于例如SIP易化VoIP(SIP facilitatedVoIP)的实时应用,典型地在业务聚集点,例如图1所示的WLAN和呼叫方网络边缘路由器(ER),必须保留特定量的网络带宽,以确保与IP分组相关的VoIP可以被转发,具有保持满意的VoIP连接所需的延迟和抖动(分组间延迟)。可以通过US 2002041590和WO 02/078289获得关于建立IP电话的QoS的更多细节。
在WLAN网络中为实时服务而留出的有限ER带宽处于WLAN QoS管理器的控制之下,该管理器确定是否接受/拒绝通过SIP配置处理(RFC 3312)来试图协商WLAN服务的新用户。然后,由ER执行由QoS管理器针对用户所阐明的接受和分组转发策略。
QoS管理器的一个职责是控制有限ER实时带宽的分配,以确保当其它用户加入WLAN网络时现有的WLAN用户不会经历QoS下降。
此外,当VoIP呼叫结束或者如果在VoIP呼叫进行期间,MN从WLAN网络运动到新网络时,QoS管理器必须释放已分配的WLAN网络资源。US 2002041590解决了当由SIP BYE消息告知呼叫终止时释放资源的上述情况。本发明解决了运动到新网络而不是简单地终止当前网络中呼叫的MN触发资源释放的情况。在该切换场景中,当在新网络上要继续呼叫时不产生SIP BYE消息,同样具有按照RFC 3312概述协商的QoS。在完成切换过程之后,需要分配给MN的WLAN资源的即时释放,以确保有限WLAN网络资源的最佳使用。
通常将网络上保留的资源与其间一些刷新命令需要继续使用这些资源的预定超时周期相关。如果不刷新,当超时周期期满时将释放资源。本发明努力使保留资源的释放与切换处理同步,而不是简单地等待超时周期过去。这使得更好地利用稀有网络资源。
可以在现有技术中找到使切换处理与资源释放同步的示例,具体地,在WO03/021977和EP 1331832中,然而这些参考文献的语境不同于本发明。WO03/021977考虑单模式无线MN在两个卫星覆盖区域之间的切换。当完成切换时,MN向处于第二区域的覆盖内的地面站发送信号,在该点第二地面站向第一地面站发送信号以放弃与MN的通信信道。除了单模式MN在同类卫星通信系统中改变基站的不同语境之外,不存在包括触发其它IP QoS释放消息的SIP协议消息的建议。
EP 1331832表现出的与本发明的类似在于:在GSM-UMTS双模式MN从GSM网络到UMTS网络的情况中,其同样考虑双模式终端的切换。当完成到UMTS网络的切换时,MN发出只释放GSM无线接口上的资源的GSM专用消息。然而,在本发明中,当从MN接收到表示已经完成切换的专用SIP消息时,发送IP专用QoS消息以释放在先前网络中而不是在无线接口上的例如边缘路由器的网络单元上的资源,这是CN或其它通信节点的职责,而不是MN的职责。因此,可见本发明解决了沿着CN和MN之间的网络路径的资源释放,而WO03/021977和EP 1331832关注MN和基站之间协商的无线电接口资源的释放。
附图说明
现在参考附图来说明本发明的示例,附图中由类似的参考数字表示类似的部分,并且附图中:
图1示意地示出了移动节点和相应节点之间的第一和第二通信链路。
图2示出了完成在两个通信链路之间切换和重新路由数据所需的信号流程图的步骤1到5。
图3示出了在从使用COPS协议的MN接收到ACK信号之后CN触发释放WLAN资源的信号流程图的步骤6到8。
图4示出了在从使用RSVP协议的MN接收到ACK信号之后CN触发释放WLAN资源的信号流程图的步骤6。
具体实施方式
在多个不同步骤中,发生在MN上从WLAN切换到UMTS的过程,在图2中示出了其时序。现在详细说明每一个步骤。
步骤1-最初,在CN和MN之间通过WLAN网络发送数据分组。
步骤2-响应例如WLAN信道质量劣化或在可选的可用网络上降低呼叫价格的、必须从当前切换到新可选网络的事件,由MN接收或产生触发。
步骤3-响应触发,MN通过新UMTS网络向CN发送SIP Re-invite消息。因为MN已经知道CN的IP地址,MN和CN之间的所有SIP消息可以直接通过,但是协议的确允许这些消息经由UMTS SIP注册处和代理服务器来路由。Re-invite消息允许MN和CN重新协商进行中的SIP会话的细节。与本发明最相关的参数是在切换完成之后CN用于定向数据分组的MN的UMTS接口的IP地址。
步骤4-CN向同意改变IP地址的MN发送SIP 200-OK消息。
步骤5-为了呼叫的可靠性,MN向CN发送SIP ACK消息,以结束SIP重新协商过程。ACK到达CN是CN用于开始使用与IP地址相关的新UMTS网络来达到MN的触发。
这就完成了切换和数据重新路由的步骤。在多个不同步骤中发生在ACK信号到达CN之后触发WLAN资源的释放的处理,在图3中示出了其时序。现在详细说明每一个步骤。
步骤6-随着ACK的到达,CN使用公共开放策略服务(COPS)协议[RFC 2748]向其自身网络中的QoS管理器发送信号。COPS是简单的询问和响应协议,可以被用于在策略服务器(策略决定点或PDP)及其客户机(策略实施点或PEP)之间交换信息。策略是为资源访问和使用定义标准的规则和服务的组合。在COPS中,PEP向PDP发送请求、更新以及删除,并且PDP将决定返回给PEP。COPS的基本消息格式尤其包括请求(REQ)、决定(DEC)以及报告状态(PRT)。在本发明的上下文中,可以将具有来自QoS管理器的辅助的CN看作PDP,以及WLAN路由器作为PEP。
步骤7-当从CN接收到COPS信号时,服务于呼叫方网络中的CN的QoS管理器向WLAN QoS管理器发送信号,以清除分配给MN的资源。
步骤8-WLAN QoS管理器还将该COPS资源释放请求传递给WLAN路由器,然后WLAN路由器实际释放先前分配给MN的资源。
在已经使用RSVP协议[RFC 2205]分配了WLAN资源的可选场景中,可以用当接收到ACK时CN发起RSVP PathTear资源释放消息(图4)来代替步骤6到8。在这种情况下,不依赖于必须被扩展来支持在(i)CN和呼叫方网络QoS管理器以及(ii)呼叫方网络QoS管理器和WLAN网络QoS管理器之间的通信的COPS信令。需要注意,正在IETF中开发的增强RSVP协议是用于释放图4中WLAN资源的更适合的协议。在涉及移动性的情况下,标准的RSVP协议不是特别适用。图4中所示的RSVP PathTear消息同样可以触发已经保留在呼叫方网络中的任何资源的释放。正在开发增强RSVP协议,以修改端到端数据路径的特定段中的资源分配。
Claims (10)
1.一种放弃分配给移动节点(MN)和相应节点(CN)之间的第一通信链路的资源的方法,在SIP切换到移动节点和相应节点之间的第二通信链路之后,第一链路经由第一网络路由信号以及第二链路经由第二网络路由信号,其中,响应从MN接收到ACK信号,产生发起释放分配给第一通信链路的资源的信号。
2.根据权利要求1所述的方法,其中,由在CN接收到ACK来触发发起资源释放的信号。
3.根据权利要求1所述的方法,其中,由在第二网络的SIP代理服务器接收到ACK来触发发起资源释放的信号。
4.根据权利要求1、2或3之一所述的方法,其中,将发起资源释放的信号传递给第一网络的QoS管理器。
5.根据权利要求3所述的方法,其中,发送到第一网络的QoS管理器的信号是由呼叫方网络QoS管理器传递的。
6.根据权利要求5所述的方法,其中,从呼叫方网络QoS管理器到第一网络的QoS管理器的信号是由COPS传递的。
7.根据权利要求1、2或3之一所述的方法,其中,将发起资源释放的信号传递给第一网络的业务聚集点。
8.根据权利要求7所述的方法,其中,业务聚集点是第一网络的边缘路由器。
9.根据权利要求7或8所述的方法,其中,使用RSVP协议来传递发起资源释放的信号。
10.实质上参考附图描述的任意方法。
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GB0321596.9 | 2003-09-15 | ||
GB0321596A GB2406022A (en) | 2003-09-15 | 2003-09-15 | Method for releasing resources at SIP handover |
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US (1) | US20070195732A1 (zh) |
EP (1) | EP1665861A1 (zh) |
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FI108200B (fi) * | 1998-09-14 | 2001-11-30 | Nokia Mobile Phones Ltd | Yhteyden vaihto matkaviestinverkkojen välillä |
US6366577B1 (en) * | 1999-11-05 | 2002-04-02 | Mci Worldcom, Inc. | Method for providing IP telephony with QoS using end-to-end RSVP signaling |
US6615236B2 (en) * | 1999-11-08 | 2003-09-02 | Worldcom, Inc. | SIP-based feature control |
US7039027B2 (en) * | 2000-12-28 | 2006-05-02 | Symbol Technologies, Inc. | Automatic and seamless vertical roaming between wireless local area network (WLAN) and wireless wide area network (WWAN) while maintaining an active voice or streaming data connection: systems, methods and program products |
US8019335B2 (en) * | 2001-01-29 | 2011-09-13 | Nokia Corporation | Identifying neighboring cells in telecommunication network |
US7123598B1 (en) * | 2001-06-29 | 2006-10-17 | Nokia Inc. | Efficient QoS signaling for mobile IP using RSVP framework |
US6885863B2 (en) * | 2001-08-31 | 2005-04-26 | The Boeing Company | Precoordination of return link for hand-off between coverage areas being traversed by a mobile transceiver platform |
US20030134650A1 (en) * | 2002-01-17 | 2003-07-17 | Rangamani Sundar | Method, system and apparatus for internetworking a mobile station to operate in a WWAN environment and in a WLAN environment with PBX services |
US6963745B2 (en) * | 2002-01-23 | 2005-11-08 | Samsung Electronics Co., Ltd. | Method for performing inter system handovers in mobile telecommunication system |
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- 2004-09-13 US US10/571,973 patent/US20070195732A1/en not_active Abandoned
- 2004-09-13 EP EP04768430A patent/EP1665861A1/en not_active Withdrawn
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- 2004-09-13 KR KR1020067005229A patent/KR20060069863A/ko not_active Application Discontinuation
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- 2004-09-13 RU RU2006112580/09A patent/RU2006112580A/ru not_active Application Discontinuation
- 2004-09-13 JP JP2006525895A patent/JP2007506295A/ja active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101960817A (zh) * | 2008-04-24 | 2011-01-26 | 阿尔卡特朗讯公司 | 通信客户之间的优化编码资源协商 |
CN101960817B (zh) * | 2008-04-24 | 2015-08-05 | 阿尔卡特朗讯公司 | 通信客户之间的优化编码资源协商 |
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GB0321596D0 (en) | 2003-10-15 |
US20070195732A1 (en) | 2007-08-23 |
BRPI0414100A (pt) | 2006-10-31 |
JP2007506295A (ja) | 2007-03-15 |
RU2006112580A (ru) | 2007-10-27 |
KR20060069863A (ko) | 2006-06-22 |
GB2406022A (en) | 2005-03-16 |
EP1665861A1 (en) | 2006-06-07 |
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