CN1301033C - Cellular network and wireless local area network loose-coupling mobile communication network - Google Patents

Cellular network and wireless local area network loose-coupling mobile communication network Download PDF

Info

Publication number
CN1301033C
CN1301033C CN 200310109500 CN200310109500A CN1301033C CN 1301033 C CN1301033 C CN 1301033C CN 200310109500 CN200310109500 CN 200310109500 CN 200310109500 A CN200310109500 A CN 200310109500A CN 1301033 C CN1301033 C CN 1301033C
Authority
CN
Grant status
Grant
Patent type
Prior art keywords
network
local area
wireless local
wireless
2n
Prior art date
Application number
CN 200310109500
Other languages
Chinese (zh)
Other versions
CN1547411A (en )
Inventor
章坚武
奚加荣
Original Assignee
杭州电子科技大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Abstract

一种蜂窝网络和无线局域网松融合的移动通信网络,其特征在于:外地无线局域网(2n″)由无线接入点(2a)、与外部连接的路由器(2b)、松耦合服务器(2c)组成,其中路由器(2b)的一个网口与无线接入点(2a)的网口连接,其另一个网口与松耦合服务器(2c)的网口连接。同现有技术比较,本发明的突出优点是:建立一个新的蜂窝网络和无线局域网松融合的移动通信方案,对不同的移动用户实现虚拟家乡代理和家乡代理的实体功能,使切换时延显著缩短,並解决三角路由问题。 A cellular mobile communications network and a wireless local area network loose fused, wherein: the router (2b) in the field of wireless local area networks (2n ") by the wireless access point (. 2A), connected to the outside, loosely coupled server (2c) consisting of wherein the router (2b) of a network port and a wireless access point (2a) is connected to the network port which the server loosely coupled with the other network port (2c) of the socket connections. Compared with the prior art, the present invention protrusion advantages are: mobile communication scheme to establish a new cellular network and a wireless local area network loose integration, virtual home agent and home agent functionality entities of different mobile users, the switching delay significantly reduce and solve the triangular routing problem.

Description

蜂窝网络和无线局域网松融合的移动通信网络 Wireless local area networks and cellular mobile communication network convergence loose

技术领域 FIELD

本发明涉及通用分组无线蜂窝网络和无线局域网中间的相互融合,特别涉及一种蜂窝网络和无线局域网松融合的移动通信网络。 The present invention relates to a General Packet Radio cellular network and a wireless local area network intermediate mutual integration, and more particularly to a mobile communication network in a cellular network and a wireless LAN loose fusion.

背景技术 Background technique

随着移动用户对高数据传输速率的不断需求和广域移动办公情况的日益增多,蜂窝移动通信网络和无线局域网的相互融合已经愈来愈有必要了。 With the increasing number of mobile users continue to demand for high data rates and wide-area mobile office, the mutual integration of cellular mobile communications networks and wireless local area networks have been increasingly necessary. 高效的将WLAN集成进无线蜂窝网络,在很多热点地区(如办公室、机场、火车站、宾馆等)为用户提供速率更高、质量更好的数据通信服务,将会成为无线通信市场中新的增长点,在业界,目前已有公司在开发同时支持WLAN和GPRS的双模式终端。 Efficient WLAN integrated into the wireless cellular network, provide users with higher rates, better quality of data communications services in many hot spots (such as offices, airports, railway stations, hotels, etc.), it will become the wireless communications market in the new growth in the industry, there are companies support both WLAN and GPRS dual-mode terminal in the development.

在数据传输速率上,GPRS蜂窝移动通信网中最高为115/kbits而WLAN可以利用其高速的数据传输速率作为GPRS的有效补充,另一方面,WLAN的工作覆盖范围为几米至百米,而对于GPRS网络来说,无线覆盖范围是远远高于WLAN的,可达到几十公里,可见,WLAN和GPRS在这两个方面是互补的,因此,WLAN和GPRS网络的互通融合,能够充分利用二者的互补能力,吸引大量的用户群,使移动用户以及运营商都能获得更大的收益。 The data transmission rate, the cellular mobile communications network GPRS up to 115 / kbits and WLAN may use its high-speed data transmission rates as an effective complement to GPRS, on the other hand, WLAN coverage for operating one hundred meters to a few meters, and for GPRS networks, wireless coverage is much higher than the WLAN can reach several tens of kilometers, visible, WLAN and GPRS in these two areas are complementary, and therefore, interworking WLAN and GPRS network integration, to take advantage of two complementary's ability to attract a large number of users, mobile users and operators can obtain greater benefits.

欧洲电信标准化协会指定了两种网络融合方案,紧耦合和松耦合。 European Telecommunications Standards Institute specifies two networks convergence, tightly coupled and loosely coupled.

如图1所示的松耦合方式中,GPRS网络由GPRS核心网和无线接入网两部分组成,其中核心网4由GPRS服务支持GPRS节点(SGSN)4a、网关GPRS支持节点(GGSN)4b、归属位置寄存器(HLR)4c组成,而基站控制器5和基站6组成无线接入部分,在松耦合方式中,是用移动IP技术来解决其移动性管理问题的,无线局域网2n是移动节点1在外地漫游时路经的无线局域网,其中的2a无线接入点(AP),2b是无线局域网与外部相连的路由器或是二层交换机,7n是移动节点1所属的家乡无线局域网。 Loose coupling shown in Figure 1, a GPRS network GPRS core network and a radio access network of two parts, wherein the core network 4 by the GPRS serving GPRS support node (SGSN) 4a, a Gateway GPRS Support Node (GGSN) 4b, a home location register (HLR) 4c composition, and the base station 5 and the base station controller consisting of a radio access part 6, in a loosely coupled manner, the mobile IP technology is used to solve the problem of management of its mobility, the mobile node is WLAN 2n 1 path field in the roaming wireless local area network, wherein the wireless access point 2a (AP), 2b is a wireless local area network or a router connected to an external switcher, the mobile node 1 7N home wireless local area belongs.

在松耦合方案中,无线局域网2n和GPRS蜂窝网络是相互独立的,相互之间的建设和延伸发展不存在影响,WLAN上层协议使用的是标准的各种Internet协议,不必对协议栈进行改造,其优势也就在于此,即无线局域网和蜂窝无线网络可以分别独立部署。 In the loosely coupled scheme, 2n wireless LAN and GPRS cellular networks are independent, construction and extension of the interaction between the development does not exist, WLAN upper layer protocols using a variety of standard Internet protocols, protocol stacks do not have to be transformed, the advantage also lies, that is, wireless LAN and cellular wireless network can be deployed independently. 但传统的移动IP技术引入了较大的切换、传输时延和丢包率,不容易提供无缝的漫游切换,这个问题业已成为现阶段需要解决的技术关键。 However, the conventional mobile IP technology into a larger switch, transmission delay and packet loss rate, is not easy to provide seamless roaming handover technology has become a key issue to be resolved at this stage.

在紧耦合方案中,如图2所示,无线局域网2n′是作为GPRS网络的一个无线接入网存在的,通过接口与GPRS服务支持节点4a连接对于GPRS核心网来说,用户在两个网络间的切换就相当于在两个独立的小区间进行一样,用户可以实现在两个网络间的无缝切换,保证切换前后会话的连续性,对服务质量QOS支持较好,但紧耦合方案的实现技术难度大,需要升级和改造现有的网络设备。 In the tightly coupled scheme, as shown in FIG WLAN 2n '2 is present as a GPRS network, a radio access network is connected via an interface to the serving GPRS support node GPRS core network 4a, a user in both networks switching between equivalent for the same, the user can achieve seamless handover between the two networks, ensuring the continuity before and after the session handover, the quality of service QOS support is preferably, but tight coupling between the two programs in separate cells achieve technical difficulties, the need to upgrade and transform existing network equipment.

现阶段发展趋势比较集中在对松耦合网络结构方面的研究。 Present trends are concentrated in the study of aspects of loosely coupled network structure.

发明内容 SUMMARY

本发明的目的在于提供一种蜂窝网络与无线局域网松融合的移动通信网络,在原有的外地无线局域网内增设一个松耦合服务器(也称虚拟家乡代理),完成漫游进入的移动用户的移动性管理功能,有效解决现有蜂窝网络和无线局域网融合中漫游移动用户在切换过程中的时延、丢包和三角路由问题。 Object of the present invention to provide a mobile communication network of a cellular network and wireless LAN loose integration, the addition of a loosely coupled server in the original field of wireless local area networks (also referred to as a virtual home agent), to complete the mobility management of the mobile subscriber roams into function, effectively solve the delay, and packet loss during the handover triangular routing problem in existing cellular and wireless local area networks fusion roaming mobile user.

一种蜂窝网络与无线局域网松融合的移动通信网络,如图3所示,无线局域网2n″中,设置了一个虚拟家乡代理2c来解决家乡代理为无线局域网7n的移动节点1在漫游过程中的移动性管理问题。 A cellular network and wireless LAN pine converged mobile communication network shown in Figure 3, the wireless LAN 2n ", set a virtual home agent is a home agent to solve 2c WLAN mobile node 1 7n during roaming mobility management issues.

现行应用的移动IP服务器是对无线局域网或是广域网中的移动用户进网后对其进行注册登记,并作为家乡代理或是外地代理,完成数据包的封装、拆装的过程,从而实现移动IP的功能。 Mobile IP is the active application server process of the wireless local area network or wide area network of the mobile user registered them into the network, and a home agent or foreign agent, encapsulates the data packet is completed, removable, enabling a Mobile IP function. 而要完成无线局域网和蜂窝网络的融合,需要有一种新的服务器,用以实现移动节点在蜂窝网络和无线局域网之间的漫游功能,本发明将这样的服务器称为松耦合服务器,并针对移动节点在外地漫游情况,定义移动节点外地访问的无线局域网中的松耦合服务器为虚拟家乡代理VHA(Virtual home Agent),摈弃传统移动IP中的外代理概念,而代之以一个新的功能实体——虚拟家乡代理,以此来实现漫游用户在松耦合网络中的移动IP功能。 And to complete the integration of WLAN and cellular network, a need for a new server to the mobile node roaming function between the cellular network and a wireless local area network, the present invention will be referred to as a loosely coupled server such a server, and mobile node in the field of roaming, mobile node defined field visits loosely coupled wireless LAN server as a virtual home agent VHA (virtual home agent), abandon the traditional concept of mobile IP foreign agent in, and replace it with a new functional entity - - virtual home agent, in order to achieve a roaming mobile user IP functions in a loosely coupled network. 如图3所示,在无线局域网2n″中设置一个这样的一个松耦合服务器2c,使之通过协调无线接入点2a以及路由器2b与外部数据网络3进行通信,从漫游至外地的移动节点1的角度来看,无线局域网2n″中的松耦合服务器2c扮演的是虚拟家乡代理的角色,而其家乡网络7n中的松耦合服务器7则是c充当家乡代理的。 As shown in FIG 3 is provided in a wireless local area network "in a 2n such a loosely coupled server 2C, so that communication by coordinating wireless access point router 2a and 2b and the external data network 3, to the field from a roaming mobile node 1 perspective, wireless LAN 2n "in the loosely coupled server 2c playing the role of a virtual home agent, and its home network of loosely coupled 7n server 7 is c acts as a home agent.

图3中的虚拟家乡代理2c所要完成的目标有下面两方面:首先是解决移动节点1在松耦合网络结构下的移动性管理问题,其中突出的是要解决在漫游切换过程中的时延和丢包等问题,实现快速、无缝的切换,其次是用以解决三角路由等传统移动IP所固有的问题。 FIG 3 in the virtual home agent to be accomplished by certain 2c has the following two aspects: First, the mobile node 1 is the solution to the mobility management problem in a loosely coupled network structure, wherein the projection is to solve the time delay during handover and roaming packet loss and other problems, fast, seamless switching, followed by a triangular routing to solve the problem inherent in conventional mobile IP.

本发明是建立在以下预先设定基础之上的:1.我们所针对的是无线蜂窝网络和无线局域网重合覆盖情形下移动节点的移动性管理问题。 The present invention is based on the predetermined basis: 1. We for a wireless cellular network and a wireless local area network coverage overlap situations the mobility management of the mobile node. 需要特别强调的是无线局域网覆盖的小区域同时也应是处于无线蜂窝网络的大区域覆盖范围之内的,这一点应该是理所当然的,甚至可能出现多个无线局域网相互之间存在邻接覆盖的情况;2.移动节点1是可以同时接入无线蜂窝网络和无线局域网的多模智能终端。 Needs to be stressed is the wireless LAN coverage area should also be small, it should be granted within a large coverage area in a wireless cellular network, the situation even exists between each adjacent covering multiple wireless LANs may arise ;. 2 mobile node 1 can access the wireless cellular network and a wireless LAN while the multi-mode intelligent terminal. 无线蜂窝网络和无线局域网事先协商好相互之间的漫游协议(采用移动IP),使得移动节点在与一方网络进行数据传输时,仍然能够与另一方网络保持通信,这样移动节点就可以利用移动IP技术在无线蜂窝网络和无线局域网之间任意漫游了;3.GPRS蜂窝网络和无线局域网是相互独立的,各自的数据传输速率相差较大,相互的融合采用松耦合方式。 Wireless cellular networks and wireless local area network roaming agreements negotiated in advance between each other (using Mobile IP), the mobile node such that when one of the data transmission network, still maintain a network communication with the other party, so that the mobile node may use mobile IP technology between wireless cellular network and a wireless local area network roam; 3.GPRS cellular network and a wireless local area network are independent of each other, the respective data transmission rate different, the mutual integration of loosely coupled manner.

图4中所示的是结合松耦合服务器无线局域网2n″的网络结构,其中松耦合服务器2c上的RJ45网口与路由器或二层交换机2b上的RJ45网口之间是通过双绞线直接相连的,同样无线接入点2a和2b之间也是通过各自的RJ45网口直接相连的。 Is shown in FIG. 4 in conjunction with the network structure of the wireless LAN server loosely coupled 2n ", wherein between the twisted pair is directly connected through the RJ45 port RJ45 network port on the router or switcher on loosely coupled server 2b 2c and between the same wireless access points 2a and 2b are through their respective network interface directly connected to the RJ45.

一种蜂窝网络和无线局域网松融合的移动通信网络,包括移动通信节点1,外地无线局域网2n,外部数据网络3,由服务支持GPRS节点4a,网关支持GPRS节点4b,归属位置寄存器4c组成的核心网4,基站控制器5,基站6,由无线接入点7a、与外部连接的路由器7b、服务器7c组成的家乡无线局域网7n,通信节点8,其特征在于:用新的外地无线局域网2n″取代原有的外地无线局域网2n,新的外地无线局域网2n″由无线接入点2a、与外部连接的路由器2b、松耦合服务器2c组成,其中路由器2b的一个网口与无线接入点2a的网口连接,其另一个网口与松耦合服务器2c的网口连接;而原有的外地无线局域网2n由无线接入点2a、与外部连接的路由器2b组成。 A cellular core network and a wireless local area network loose convergence mobile communication, comprising a mobile communication node 1, the wireless LAN field 2n, an external data network 3, by the serving GPRS support node 4a, a gateway GPRS support node 4b, 4c composed of the home location register 4 network, the base station controller 5, a base station 6, the wireless access point 7a, 7b connected to the outside of the router, server 7c composed of 7N home wireless LAN, the communication node 8, wherein: the field with a new wireless LAN 2n " replace the original WLAN field 2n, the new field WLAN 2n "by the wireless access points 2a, 2b router connected to the outside, 2c loosely coupled server, where a network port router 2b with the wireless access point 2a network interface connector, which is connected to the other loosely coupled network port 2c of the server network interface; field and the original wireless LAN by the wireless access point 2n 2a, 2b router connected to the outside composition.

下面结合移动节点切换的初始阶段、判决阶段、执行阶段的三个过程以及由松耦合服务器所扮演的虚拟家乡代理需要实现的两个功能进行阐述。 The initial stage below in conjunction with mobile switching node, the verdict stage, two three functions during the execution stage and played by a loosely coupled server virtual home agents need to be implemented to elaborate.

首先针对一般的情况,移动节点1于外地漫游时,如图3所示移动节点1由GPRS蜂窝网络向无线局域网2n″切换的过程(图3中所示的实线箭头方向),结合本发明的网络结构以及方案作详细的阐述。 First, for the general case, the mobile node 1 at the time of foreign roaming mobile node 1 shown in Figure 3 by a GPRS cellular network to the WLAN 2n "handover procedure (solid line arrow direction in FIG. 3), in conjunction with the present invention the network infrastructure, and the program described in detail.

图5为本发明中移动节点1在如图3所示的由GPRS蜂窝网络向无线局域网2n″切换的简化过程。 FIG 5 is a simplified process of the invention the mobile node 1 shown in FIG. 3 by a GPRS cellular network to the WLAN 2n "handover.

图6为移动节点1由无线局域网2n″向GPRS蜂窝网络切换的简化过程。 FIG 6 is a simplified process of the mobile node 1 by a wireless LAN 2n "switching to a GPRS cellular network.

一般而言,可以依照移动节点所接收到的信号强度(RSS_WLAN)来激励系统进入切换初始状态,然而这对于某些情况将造成“乒乓效应”,而严重影响系统的移动性能,对这里涉及的蜂窝网络和局域网之间的切换过程更是不合适,因为无线局域网的覆盖范围比较小,如果用户速度较快,且无线局域网的覆盖半径比较小,即使RSS_WLAN上升到了很高的水平,也不应该切换到这个无线局域网中,因为像这样的移动节点路过无线局域网的情形会造成频繁的切换,势必显著降低系统的移动性能。 In general, the mobile node can be excited in accordance with the received signal strength (RSS_WLAN) switching system enters an initial state, however, this will result in some cases for "ping-pong effect", and seriously affect the performance of the mobile system, according to herein a handover procedure between the cellular network and the local area network is not suitable, because coverage of the wireless LAN is relatively small, if the user is faster, and the wireless LAN coverage radius is relatively small, even RSS_WLAN rises to a high level, and should not be switch to this wireless LAN, because the mobile node passing situations like this wireless LAN will cause frequent switching, it is bound to significantly reduce the mobility of the system.

本发明中的切换判决模型,采用文献[1]中的数学模型。 Handover decision algorithm in the present invention, a mathematical model in [1]. 如果系统要求参考移动节点的移动速度Vn、RSS_WLAN(简记为Sn)作为判决的参数,这是两个最基本而且最重要的参数(应该尽量选用较小的参数以减轻系统的负担)则通过下式中的数学模型来计量代价Cost函数值。 If you are asked to move the moving speed Vn reference node, RSS_WLAN (abbreviated as Sn) as a parameter of judgment, which is the most basic and most important two parameters (should try to use a smaller parameters to reduce the burden on the system) through mathematical model formula to measure the cost Cost function value.

Costn=δvInVn+δsInsn,(δv+δs=1)__ (1)式中Costn是所要参考的代价函数值,δv及δs为归一化系数,其大小显示系统对相应项的重视程度。 Costn = δvInVn + δsInsn, (δv + δs = 1) __ (1) wherein Costn is to be referred to as the cost function value, [Delta] V and [Delta] S is a normalization coefficient, emphasis display size item corresponding system.

图7为移动节点由GPRS蜂窝网络向无线局域网2n″切换的流程图。移动节点1在由GPRS蜂窝网络向无线局域网的移动过程中,开始接收到无线局域网发来的广播消息M1,随后检测是否满足切换初始条件M2,这个切换初始条件即采用上面提到的Cost函数来作判决,一旦出现CostWLAN<CostGPRS的情况,即满足了切换初始条件,则移动节点1就向无线局域网2n″发送一个预切换指令,进入切换初始状态,计时器2开始计时M3,并且在计时器2计时的过程中,还需要不间断的状监测态CostWLAN<CostGPRS是否持续M3′,如果在这个过程中一旦出现CostWLAN>CostGPRS,则计时器2立即清零,并且向家乡代理发送撤消通告,等下次检测到满足切换条件时,计时器再由0开始计时。 FIG 7 is a "flowchart of the handover by the mobile node GPRS cellular network to the wireless local area 2n. Mobile node 1 in the wireless LAN to the movement beginning to receive the GPRS network to a wireless local area network cellular broadcast messages sent by M1, then detects whether switching the initial conditions satisfying M2, i.e. the initial conditions employed Cost switching function to make the decision mentioned above, occurs once CostWLAN <CostGPRS case, the switching of the initial conditions is met, the mobile node 1 on "to send a pre-WLAN 2n switching instruction to switch into the initial state, the timer starts counting M3 2, and in the process of counting the timer 2, also requires constant monitoring of state status CostWLAN <CostGPRS continues for M3 ', if once in this process appears CostWLAN> CostGPRS, immediately clears the timer 2, and the revocation notices sent to the home agent, and so the next time the detected switching condition is satisfied, then the timer start counting 0. 当然,如果一开始就不满足上述初始切换条件的话,则就应该继续检测是否满足切换初始条件。 Of course, if the start conditions not satisfying the above initial switching, then it should continue to detect whether switching satisfies the initial conditions.

无线局域网2n″收到这个预切换指令后,为移动节点1分配一个关照地址CoAWLAN,随即虚拟家乡代理2b将这个关照地址通告给移动节点1的家乡代理(这时无线局域网2n″不必将这个CoAWLAN通知给移动节点1),家乡代理收到消息后,立即启动计时器1由零开始计时M4。 WLAN 2n "Upon receipt of this pre-shift command, the mobile node 1 a care of address assigned to CoAWLAN, then the virtual home agent care of address 2b this advertisement to the mobile node a home agent (in this case WLAN 2n" do not have this CoAWLAN notification to the mobile node 1), the home agent receives a message, start timer 1 starts counting from zero M4 immediately.

接下来,家乡代理7c如果在计时器1计时达到τ时仍没有收到来自虚拟家乡代理2b的撤消更新消息的话,即检测到计时器1计时达到τ时M5,则家乡代理7c立即将此CoAWLAN通告给与移动节点保持通信和需要联系的通信节点8(通信节点8的相关信息都在移动节点的家乡代理7c中储存着,因为在通信节点发送消息给移动节点的初始路由时必然要经过家乡代理,故而HA可以将这个通信节点的相关信息储存下来),从而完成切换过程M6。 Next, the home agent 7c If the timer reaches τ 1 does not receive undo the update message from the virtual home agent 2b of the case, that is detected when the timer counts up to 1 τ M5, the home agent immediately 7c this CoAWLAN given mobile node advertisement and communication node needs to maintain communication links 8 (information communication node 8 are in the home agent when the mobile node in a storage 7c, because sending a message to the initial routing node in the mobile communication node is bound to be home agent, HA therefore this information can be stored off communication node), thereby completing the handover procedure M6.

另一方面,一旦检测计时器2计时达到δ了M5,(然后计时器2重新开始清零计时),即CostWLAN>CostGPRS的状态持续的时间已经达到切换要求的门限时间了,则虚拟家乡代理2b随即将这个CoAWLAN发送给移动节点1,这也就意味着移动节点1将切换目标锁定为这个无线局域网2n″,并已经决定立即执行切换了。随后移动节点1就通过这个无线局域网2n″与外部数据网络3进行通信了,从而完成了整个切换过程M6。 On the other hand, upon detection timer 2 counts up the M5 δ, (2 restarts the timer is cleared and counting), i.e. CostWLAN> duration CostGPRS switching request state has reached the threshold time, the virtual home agent 2b CoAWLAN then sends this to the mobile node 1, which means that the mobile node 1 2n switches targeted for the wireless local area network ", and has decided to implement immediately switched. then the mobile node 1 on the adoption of the wireless LAN 2n" and external a data communication network 3, thereby completing the entire handover procedure M6. 这个切换过程中,虚拟家乡代理2b总是和移动节点1的家乡代理7c绑定在一起作用的,从移动节点1的角度来看,虚拟家乡代理2b起到的作用就如同家乡代理一样。 This handover process, the virtual home agent and the mobile node's home always 2b 1 binding agent 7c acting together, from the point of view of the mobile node 1, the virtual home agent 2b like the role as the home agent.

对于这个执行切换的过程,从家乡代理7c一侧来看,当计时器1计时达到τ的时候,家乡代理7c将CoAWLAN即时传给通信节点8,然后通信节点就以这个CoAWLAN为目标地址直接和移动节点进行通信,这样便完成了整个切换任务。 The procedure for performing handover, from the home agent 7c side view, when the timer time reaches a time τ, the home agent 7c CoAWLAN real time to the communication node 8, and then on to the communication node as the destination address directly CoAWLAN mobile node communicates, thus completing the entire handover tasks.

其实从根本上讲,计时的过程就是一个切换目标的判决过程。 In fact, fundamentally, the timing of the decision process is a process of switching the target. 这里的两个计时器:计时器1、计时器2分别是设在虚拟家乡代理2b和移动节点1中的。 Here two timers: Timer 1, Timer 2 are arranged in the virtual home agent and the mobile node 1 2b. 采用两个计时器计时,可以在切换过程中更灵活、精确地减少切换时延,因为只要有任一个计时满足条件,就表明了移动节点1立即执行切换,而且可以减少丢包率。 Timer using two, more flexibility in the switching process, precisely to reduce the switching delay, as long as there is any of a timing condition is satisfied, it means that the mobile node 1 to perform handover immediately, and can reduce packet loss rate. 计时器2在移动节点1切换进无线局域网2n″后继续工作,并以计时是否超过T来为系统作判决参考,而计时器1也在反向的移动节点由无线局域网向GPRS蜂窝网络切换时起计时判决作用,后面将讲到这些内容。 After the timer 2 in the mobile node 1 is switched into the wireless LAN 2n "continue its work and to whether the timer T exceeds the reference system to make the decision, and also in the timer counter 1 is switched from the mobile node to a wireless local area network when a GPRS cellular network timing plays the role of judgment, later talked about the content.

以下就以移动节点1从无线局域网2n″向GPRS蜂窝网络切换的过程(如图3中所示的虚线箭头方向)来进一步详细阐述本发明的方案。 Following on from the mobile node 1 2n "the process of switching to GPRS cellular wireless local area network (dotted arrow direction as shown in FIG. 3) to further illustrate the present invention in detail.

由于有不少情况是移动用户离开家乡网络后在外地的无线局域网中只停留不长的时间,例如用户在机场候车、参加外地临时会议等情况。 Because there are many cases be the case after the mobile user leaves the home network only stay in the field of wireless local area network in a short time, for example, a user waiting at the airport, participating in field temporary meetings. 而且这些情况越来越普遍,那么可以考虑当用户从蜂窝网络切换进无线局域网后的一定的时间,依然保留用户原先在蜂窝网络中的关照地址CostGPRS。 And more and more common these circumstances, consider switching from a cellular network when the user into a certain time after the wireless local area network, the user still retains the original address CostGPRS care in a cellular network. 具体过程如下:当移动节点1执行从GPRS蜂窝网络到无线局域网2n″的切换后,移动节点1就通过无线局域网2n″对外连接的链路收发数据包了,并且移动节点1依然通过原先在GPRS蜂窝网络中的CostGPRS周期的检测与此蜂窝网络的连接,并计时,这时定义这条以CostGPRS连接到蜂窝网络的链路处于Sleep状态。 Specific process is as follows: when the mobile node performs a GPRS cellular network to a wireless LAN 2n "after the handover, the mobile node 1 to wireless LAN 2n" link transceiver connected to the external of the data packet, and the mobile node 1 is still GPRS originally by period detecting CostGPRS cellular network and the cellular network connection, and the timing, in this case defined CostGPRS link connected to the cellular network in Sleep state.

如果计时器2计时超过时间T,则移动节点1自动释放这个CostGPRS。 If the timer time exceeds the second timer T, the mobile node 1 releases the automatic CostGPRS. 这样一来,只要移动节点1切换进入无线局域网2n″且在其中停留的时间超过T,则移动节点1再从无线局域网2n″切换出蜂窝网络时就激活CostGPRS(使其处于Active状态),而不必重新向蜂窝网络申请关照地址,从而可以直接简便地恢复原先与蜂窝网络的无线链路,这样通信节点就可以直接和移动节点进行通信了,并且这种情况下,为避免增加蜂窝网络的负担,而采取如前类似的方法由虚拟家乡代理协同家乡代理工作,并将这个CostGPRS即时通告给通信节点,以减少切换时延以及解决通信过程中的三角路由问题。 Thus, as long as the mobile node enters a wireless LAN switching 2n "and wherein the residence time exceeds T, then the mobile node 1 from the WLAN 2n then" activate handover of a cellular network CostGPRS (it is in Active state), and do not have to re-apply to the care of address of the cellular network, which can easily restore the original wireless link directly to a cellular network, and so that the communication node may communicate directly with the mobile node, and in this case, to avoid increasing the burden on the cellular network , to take a similar approach as before by the virtual home agent home agent collaborative work, and this CostGPRS immediate announcement to the communication node to reduce the handover latency and addressing triangular routing problem in the communication process.

而如果移动节点1在无线局域网2n″停留的时间大于T,即记时器1计时超过了T,则移动节点1释放原先与蜂窝网络通信的关照地址。这种情况下的由无线局域网2n″向GPRS蜂窝网络切换的过程如图6所示。 If the mobile node in a wireless LAN 2n 1 "when the residence time is greater than T, which exposes a clocked timer exceeds T, then the mobile node care of address of a previously released a cellular network, which communicates with a wireless LAN in this case 2n" the process of switching to a GPRS cellular network as shown in FIG. 在这个过程中,充分利用无线局域网的高速传输以及宽带特的点,尽量在切换的过程中利用无线局域网来传输数据以及指令信息,一个简单的例子就是2Mb/s的速度传1秒比以19.2Kb/s传输100秒要好。 In this process, the full use of point high-speed transmission and broadband Laid wireless LAN, as far as possible using a wireless LAN to transmit data and instructions information during handover, a simple example is 2Mb / s speed transfer one second ratio 19.2 kb / s transmission is better than 100 seconds.

当移动节点由无线局域移向网蜂窝网络时,仍然利用虚拟家乡代理协同家乡代理一起工作,来实现这个切换过程中的双向链路连接,使切换时延缩短,且解决了三角路由问题。 When the mobile node moves to a cellular network by the wireless local area network, still using the collaborative virtual home agent home agent work together to achieve this handover process of two-way link connection, the switching latency reduction, and to solve the triangular routing problem.

图8为移动节点由无线局域网向蜂窝网络切换的流程图。 8 is a flowchart of a mobile node handoff from the WLAN to the cellular network. 移动节点在无线局域网中移动时亦收到来自蜂窝网络的广播消息M1,并通过上述(1)式中的模型来检测是否满足切换初始条件M2,如果发现满足了切换初始条件,则一方面计时器1开始由0计时M3,并且检测计时器2是否计时达到T,另一方面实时监测满足初始条件的状态是否持续M3′,接下来,如果计时器2计时尚未达到T,就表明移动节点在无线局域网中停留的时间比较短,就激活CostGPRS,直接与蜂窝网络建立链路连接,完成切换M4。 The mobile node in wireless LAN M1 also receives a broadcast message from a mobile cellular network, and is detected by (1) the above model satisfies the initial conditions handover M2, if it is found to meet the switching of the initial conditions, on the one hand the timer M3 starts counting from 0 1, 2 and detects whether or not the timer T counts up, whether the real-time monitoring on the other hand satisfies the initial conditions is continued M3 ', followed, if the timer T has not reached the second timer, it indicates that the mobile node in a wireless LAN relatively short residence time, is activated CostGPRS, establish a link directly connected to the cellular network, handover is completed M4. 如果计时器2计时已经达到T,则移动节点就向蜂窝网络申请注册M5,由SGSN来处理为移动节点分配一个CoAGPRS,并将之传给移动节点M6,移动节点将这个CoAGPRS通告给虚拟家乡代理M7,然后虚拟家乡代理将这个关照地址通告给家乡代理,计时器由0开始计时M8,随即在M3的实时监测过程中,如果计时器1计时达到τ′,则建立直接通过GPRS蜂窝网络的从移动节点到通信节点的双向链路,从而完成切换M9。 If the timer 2 timer has reached T, the mobile node to apply for registration to the cellular network M5, allocated by the SGSN to deal with a CoAGPRS for the mobile node, and sends it to mobile node M6, the mobile node will announce this to the virtual home agent CoAGPRS M7, then the virtual home agent will take care of this notice to the address of the home agent, the timer starts counting from 0 M8, M3 immediately in real-time monitoring of the process, if the timer counts up to 1 τ ', is established from the direct GPRS cellular network the mobile node to the communication node of the bidirectional link, thereby completing the handover M9.

现有技术比较,本发明具有如下突出优点:(1)在网络结构中引入一个实体——虚拟家乡代理,以协同原有的家乡代理一起处理切换过程中MN和CNs之间的通信连接;(2)建立一个新的移动性管理方案,使得移动节点在切换执行时就可以直接和通信节点进行通信,不必使数据包绕经家乡代理,这将显著地缩短切换时延,并解决了三角路由问题;(3)在由蜂窝网络切换到WLAN后,采用在一预先设定的时间内继续以关照地址CoAGPRS保持和蜂窝网络的连接策略,这在一定程度上将在移动节点切换出无线局域网时获得更佳的切换性能,特别是未来IPv6网络下,因IP地址的充足而使这样的定时不丢弃策略是很有价值的;(4)本方案是建立在松耦合网络结构的基础之上的,所以对现有的蜂窝网络和无线局域网结构不需要作较大的改动,对于GPRS以及以WCDMA蜂窝网络不需要作结构上 Comparison of the prior art, the present invention has the following outstanding advantages: (1) introducing an entity in the network structure - virtual home agent, the home agent in a synergistic with existing communication connection between the handover process during the MN and CNs; ( 2) create a new mobility management scheme, such that the mobile node and the correspondent node can be executed at the time of switching the direct communication, the data is not necessary to wrap over the home agent, which would significantly shorten the switching delay and to solve the triangular routing (3) after the handover by the cellular network to the WLAN, and using the connection policy to maintain the cellular network to a care of address CoAGPRS within a predetermined time, the wireless local area network in which the mobile switching node to a certain extent; problems handover for better performance, in particular in the IPv6 network in the future, because of such timing is not sufficient to discard the IP address is a valuable strategy; (4) the present embodiment is based on a loosely coupled network structure on, so the existing cellular network and a wireless LAN does not need to make large changes to the structure for GPRS and WCDMA cellular network does not need to make the structure 的改动,而只需在WLAN中增设一个特殊的服务器,对不同的移动用户实现虚拟家乡代理和家乡代理的实体功能,以及确定好蜂窝网络和WLAN之间的漫游协议即可。 Changes, but only in the addition of WLAN in a special server, performs physical function of the virtual home agent and home agent for different mobile users, and to determine the roaming agreements between cellular networks and WLAN can be good.

附图说明 BRIEF DESCRIPTION

图1为现有的松耦合网络结构示意图。 Figure 1 is a schematic view of a conventional loosely coupled network structure.

图2为现有的紧耦合网络结构示意图。 FIG 2 is a schematic diagram of a conventional network structure of tight coupling.

图3为本发明的松耦合网络结构示意图。 3 a schematic view of loosely coupled network structure of the present invention FIG.

图4为本发明中的包含松耦合服务器的无线局域网的网络结构图。 FIG 4 is a configuration diagram of a wireless local area network comprising a loosely coupled server of the present invention.

图5为简化的移动节点由GPRS蜂窝网络向无线局域网切换的过程图。 FIG 5 is a simplified mobile node during handover to a GPRS cellular network WLAN.

图6为简化的移动节点由无线局域网向GPRS蜂窝网络切换的过程图。 FIG 6 is a simplified mobile node during handover to a GPRS cellular network by a wireless LAN.

图7为移动节点由GPRS蜂窝网络向无线局域网切换的流程图。 7 is a flowchart of a mobile node handoff from the WLAN to a GPRS cellular network.

图8为移动节点由无线局域网向GPRS蜂窝网络切换的流程图。 FIG 8 is a flowchart of a mobile node switches to the cellular network by the wireless local area network GPRS.

参考文献[1]Helen.J.Wang.Randy.H.Katz.Jochen Giese.“Policy-Enabled Handoffs AcrossHeterogeneous Wireless Networks.”2nd IEEE Workshop on Mobile Computing andAppilcations(WMCSA 99).New Or Ieans.February 1999. References [1] Helen.J.Wang.Randy.H.Katz.Jochen Giese. "Policy-Enabled Handoffs AcrossHeterogeneous Wireless Networks." 2nd IEEE Workshop on Mobile Computing andAppilcations (WMCSA 99) .New Or Ieans.February 1999.

Claims (1)

  1. 1.一种蜂窝网络和无线局域网松融合的移动通信网络,包括移动通信节点(1),外地无线局域网(2n),外部数据网络(3),由服务支持GPRS节点(4a),网关支持GPRS节点(4b),归属位置寄存器(4c)组成的核心网(4),基站控制器(5),基站(6),由无线接入点(7a)、与外部连接的路由器(7b)、服务器(7c)组成的家乡无线局域网(7n),通信节点(8),其特征在于:用新的外地无线局域网(2n″)取代原有的外地无线局域网(2n),新的外地无线局域网(2n″)由无线接入点(2a)、与外部连接的路由器(2b)、松耦合服务器(2c)组成,其中路由器(2b)的一个网口与无线接入点(2a)的网口连接,其另一个网口与松耦合服务器(2c)的网口连接。 A wireless local area network and a cellular mobile communication network convergence loose, comprises a mobile communication node (1), in the field of wireless local area network (2N), external data network (3), by the serving GPRS support node (. 4A), a gateway GPRS support node (4B), a home location register (4c) consisting of a core network (4), a base station controller (5), the base station (6), by the wireless access point (. 7A), the router (7b) connected to the outside, the server (7c) consisting of home wireless local area network (7N), the communication node (8), characterized in that: (2n ") to replace the original field of wireless local area network (2n) in the field with a new wireless LAN, wireless LAN new field (2n ") by the wireless access point (2a), the router (2b) connected to the outside, loosely coupled server (2c), where a router (2b) of a network port and a wireless access point (2a) is connected to the network port, another port is connected loosely coupled network server (2c) network port.
CN 200310109500 2003-12-14 2003-12-14 Cellular network and wireless local area network loose-coupling mobile communication network CN1301033C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200310109500 CN1301033C (en) 2003-12-14 2003-12-14 Cellular network and wireless local area network loose-coupling mobile communication network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200310109500 CN1301033C (en) 2003-12-14 2003-12-14 Cellular network and wireless local area network loose-coupling mobile communication network

Publications (2)

Publication Number Publication Date
CN1547411A true CN1547411A (en) 2004-11-17
CN1301033C true CN1301033C (en) 2007-02-14

Family

ID=34335237

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200310109500 CN1301033C (en) 2003-12-14 2003-12-14 Cellular network and wireless local area network loose-coupling mobile communication network

Country Status (1)

Country Link
CN (1) CN1301033C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8130718B2 (en) * 2004-12-09 2012-03-06 Interdigital Technology Corporation Method and system for interworking of cellular networks and wireless local area networks
CN100455098C (en) 2005-01-10 2009-01-21 中兴通讯股份有限公司 Integrated wireless access network structure and its method
CN1929497B (en) 2005-09-07 2010-07-07 华为技术有限公司 Method and system for obtaining moving nodes local proxy information
US20070082697A1 (en) 2005-10-07 2007-04-12 Research In Motion Limited System and method of handset configuration between cellular and private wireless network modes
CN100461958C (en) 2006-04-30 2009-02-11 中国联合通信有限公司 Mobile communication access system and method
CN101159969B (en) 2007-11-19 2011-04-27 电子科技大学 Content based access network combining scheme under heterogeneous wireless surroundings
CN102123403B (en) * 2011-03-31 2013-10-09 东南大学 Method for optimizing fusion performance of heterogeneous network
CN103856997A (en) * 2012-11-30 2014-06-11 中兴通讯股份有限公司 Method and system for wireless local area network switching
CN105992398A (en) * 2015-03-05 2016-10-05 电信科学技术研究院 Communication system, communication network, communication equipment and communication method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001097428A2 (en) * 2000-06-08 2001-12-20 Sierra Wireless, Inc. Wireless modem simulation of a lan card
CN1340932A (en) * 2000-08-28 2002-03-20 Lg电子株式会社 Mail receiver/transmitter device for integrated wireless local loop and wireless domain net
CN1430340A (en) * 2001-12-29 2003-07-16 联想(北京)有限公司 Radio communication system combining with long and short distance technology and its realizing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001097428A2 (en) * 2000-06-08 2001-12-20 Sierra Wireless, Inc. Wireless modem simulation of a lan card
CN1340932A (en) * 2000-08-28 2002-03-20 Lg电子株式会社 Mail receiver/transmitter device for integrated wireless local loop and wireless domain net
CN1430340A (en) * 2001-12-29 2003-07-16 联想(北京)有限公司 Radio communication system combining with long and short distance technology and its realizing method

Also Published As

Publication number Publication date Type
CN1547411A (en) 2004-11-17 application

Similar Documents

Publication Publication Date Title
Siddiqui et al. Mobility management across hybrid wireless networks: Trends and challenges
Tsao et al. Design and evaluation of UMTS-WLAN interworking strategies
US7221927B2 (en) Station mobility between access points
Park et al. Vertical Hando. Procedure and Algorithm between IEEE802. 11 WLAN and CDMA Cellular Network
Jaseemuddin An architecture for integrating UMTS and 802.11 WLAN networks
An et al. Reduction of handover latency using MIH services in MIPv6
Lee et al. A framework of handoffs in wireless overlay networks based on mobile IPv6
US20060159047A1 (en) Method and system for context transfer across heterogeneous networks
US6519235B1 (en) Mobile radio communication packet data network
Lai et al. Improving handoff performance in wireless overlay networks by switching between two-layer IPv6 and one-layer IPv6 addressing
WO2003054721A1 (en) Method and apparatus for handing off a mobile terminal between a mobile network and a wireless lan
JP2002125254A (en) Hand-off method and agent device
WO2003088691A1 (en) Handover control method
CN1479494A (en) System of interconnecting CDMA system and radiolocal network
CN101841880A (en) LTE and WLAN interconnecting system and switching method
CN1997200A (en) Cell switching method of cross-evolving node B in the long-evolving mobile communication network
WO2006012909A1 (en) Handover in a mobile communications network
CN1596023A (en) Method for implementing seamless switching between mobile nodes in mobile IP
CN101690319A (en) Method, radio system, and base station
CN101175316A (en) Method for cross-local mobile administrative domain switch-over and its communication system
US20060050674A1 (en) Handoff system and method between mobile communication network and wireless LAN
US20060077934A1 (en) Handoff system and method of dual mode mobile for connecting mobile communication system and wireless network
CN1543152A (en) A multi-protocol data gateway and method for implementing communication thereof
CN1960566A (en) Evolution mobile communication network, method for managing mobility between 3GPP and non-3GPP access network
CN1568044A (en) Method of seamless home agent switching of mobile IPv6

Legal Events

Date Code Title Description
C06 Publication
C10 Request of examination as to substance
C14 Granted
LIC Patent license contract for exploitation submitted for record

Effective date: 20081020

Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.10.1 TO 2013.9.30; CHANGE OF CONTRACT

Name of requester: ZHEJIANG UNIVERSITY HANGZHOU XINDA DIGITAL TECHNOL

C17 Cessation of patent right