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CN101237470B - A car ground broadband access method based on wireless multi-hop network technology - Google Patents

A car ground broadband access method based on wireless multi-hop network technology Download PDF

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CN101237470B
CN101237470B CN 200810044948 CN200810044948A CN101237470B CN 101237470 B CN101237470 B CN 101237470B CN 200810044948 CN200810044948 CN 200810044948 CN 200810044948 A CN200810044948 A CN 200810044948A CN 101237470 B CN101237470 B CN 101237470B
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wireless
mesh
method
data
based
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CN 200810044948
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CN101237470A (en )
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方旭明
李志杰
程谦云
胥桓
钟斌
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西南交通大学
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Abstract

The invention discloses a vehicle-ground broadband access method based on a wireless mesh network technology, in which an access method for wireless mesh points consist of gateway nodes and a plurality of access points is specified in a layer 2 address-based layer 2.5 protocol between a layer 2 protocol and a layer 3 protocol. The method comprises the following steps: a, creating and updating a tree-based routing table for each wireless mesh point, which is used for recoding physical addresses for a parent node and a child node, and creating and updating a proxy table for each wireless mesh point, which comprises table entries of all vehicle-carried subnet point below the tree-based routing table of the wireless mesh point; b, data frame transmission, which realizes data format conversion, data transmission, data receiving and forwarding between a wireless mesh network and a vehicle-carried subnet as well as between wireless mesh gating nodes and a public network through the wireless mesh points; c, node switch, in which channels of the same frequency are adopted for access channels of all wireless mesh point for realizing seamless switching between the nodes. The method has the advantages of convenient networking, low cost, high-speed for data transmission, high reliability.

Description

一种基于无线多跳网络技术的车地宽带接入方法 Broadband access to a vehicle based wireless multi-hop network technology

技术领域 FIELD

[0001] 本发明涉及无线网络的数据传输技术,特别涉及一种基于无线多跳网络技术的车地宽带接入方法。 [0001] relates to wireless data transmission network of the present technology, particularly to a wireless multi-hop network technology based on broadband access method to the vehicle.

背景技术 Background technique

[0002] 随着铁路、公路等移动车载用户在旅行过程中对公众信息网络接入需求的不断增加,现有的信息网络对移动车载用户接入的支持水平已经难以满足用户的需求。 [0002] As the rail and road-vehicle mobile users to access the growing demand for public information network in the travel process, the level of existing information networks to support mobile users to access the car has been difficult to meet the needs of users. 特别是随着高速旅客车辆和豪华旅游车辆的相继开行,信息网络的移动接入技术必须得到相应的改善和提高。 Especially with the high-speed passenger lines have opened tourist vehicles and luxury vehicles, mobile access technology information network must be appropriate to improve and enhance.

[0003] 无线多跳网络是一种新型的宽带无线网络结构,即一种高容量、高速率的分布式网络。 [0003] Multi-hop wireless networks is a new broadband wireless network architecture, distributed network that is a high-capacity, high rate. 在网络拓扑上,无线多跳网络包括移动Ad hoc (无线自组织)网络、无线Mesh (网状) 网络(WMN)等;在单跳接入上,无线多跳网络可以看成是一种特殊的无线局域网(Wireless Local Area Network,WLAN)。 In the network topology, a wireless multihop network comprises a mobile Ad hoc (wireless ad-hoc) networks, Wireless the Mesh (mesh) network (the WMN) and the like; in a single-hop access, wireless multihop network can be seen as a special WLAN (wireless Local Area Network, WLAN). 由于有较高的可靠性、较大的伸缩性和较低的投资成本,无线多跳网络开始得到特别重视和应用。 Due to the higher reliability, greater flexibility and lower investment cost, wireless multi-hop network began to receive special attention and application. 通过文献检索,我们发现,对于车地宽带无线接入方法与系统,尚无任何完整的技术方案;而且,通过专利查新,也未发现基于无线多跳网络的车地宽带接入系统的完整的解决方案。 Literature search, we found that the vehicles for broadband wireless access systems and methods, there is no complete any aspect; Furthermore, investigation by the new patent, also found to complete broadband access system vehicle based wireless multi-hop network s solution.

[0004] 当前,基于WLAN(无线局域网)基本技术的WMN(无线网格网络)标准是由IEEE 主导制定的,称为IEEE 802. Ils标准。 [0004] Current, the WMN (wireless mesh network) standard based WLAN (Wireless Local Area Network) technology is substantially dominated by the IEEE developed, called the standard IEEE 802. Ils. 第一版标准尚在制定之中,但IEEE已经制定了第一版IEEE 802. Ils标准草案供各标准参与制定单位讨论与修改。 Among the first edition standards are under development, the IEEE has developed a first draft of IEEE 802. Ils standard for each standard units involved in developing the discussion and modification.

[0005] 按IEEE 802. Ils草案,WMN网络拓扑结构分为3层,最低一层拓扑层为“终端用户层”,由用户终端设备组成,包括手机、笔记本电脑、PDA等设备,构成标准802. 11接入网; “终端用户层”之上的拓扑层是“无线Mesh(网格)层”,由纯转发的无线Mesh节点(Mesh Point,MP)和可以转发也可以接入的无线Mesh接入节点(Mesh Access Point,MAP)构成, 组成WMN,终端用户可以通过该层接入核心网络,终端用户之间也可以通过该层进行数据交互;WMN的第三拓扑层为“核心网络层”,主要提供各种网络互连服务。 [0005] according to the draft IEEE 802. Ils, WMN network topology is divided into three layers, the lowest layer is a layer topology "EUL", by the user terminal device, including mobile phones, laptop computers, PDA equipment, standard configuration 802 11. the access network; topology layer above the "end user layer" "wireless mesh (mesh) layer", wireless mesh pure forwarding node (mesh Point, MP), and access can be forwarded wireless mesh the access node (Mesh access Point, MAP) configuration, consisting of the WMN, the end user may, between end users may exchange data through the layer access a core network through the layer; the WMN topology third layer "core network layer "mainly to provide a variety of network interconnection services.

[0006] WMN解决方案主要的网元为无线Mesh节点(Mesh Point,MP)和无线Mesh接入点(Mesh Access Point, MAP)构成,各网元主要功能如下: [0006] WMN solutions main element is a radio network node Mesh (Mesh Point, MP) and Wireless Mesh access points (Mesh Access Point, MAP) configuration, the main functions of each network element:

[0007] 无线Mesh接入点(Mesh Access Point,MAP) 0首先具有传统接入点的功能,当终端用户接入网络时,同样必须经过物理层传输、IEEE 802. 11或者IEEE 802. lie MAC层的调度接入网络。 [0007] Wireless Mesh Access Point (Mesh Access Point, MAP) 0 First legacy access point has a function of, when an end user access to the network must pass through the same physical layer transmission, IEEE 802. 11 or the IEEE 802. lie MAC scheduling the access network layer. MAP与传统WLAN接入点(AccessPoint)AP的根本区别在于,MAP拥有路由机制。 MAP and legacy WLAN access point (the AccessPoint) The fundamental difference is that the AP, MAP has a routing mechanism. 若非单跳范围内的用户若需要相互通信,必须由源节点通过路由机制,查找到达目的节点的路径,然后根据该路径信息来传递数据,而传统的AP则不存在路由功能。 If not within single hop range of the user's need to communicate, if necessary by the source node routing mechanism to find the path to the destination node, and to transmit data according to the path information, and the conventional AP exists no routing function.

[0008] 无线Mesh节点(Mesh Point,MP)。 [0008] Wireless Mesh nodes (Mesh Point, MP). 无线Mesh节点的主要功能是连接WMN与核心网络,使装有无线网卡的终端设备可以通过MAP共享核心网的资源。 The main functions of the wireless connection WMN Mesh nodes are the core network, so that the terminal apparatus is provided with wireless LAN core network resources can be shared by MAP.

[0009] IEEE 802. Ils标准草案是无线多跳网络很好的解决方案,但并不是专门针对车地宽带接入系统而制定,因此在应用还存在以下的缺点:1)对于车地宽带接入系统特殊的直线或树型路由拓扑结构,采用普通网格状的IEEE802. Ils方案效率较低;2) IEEE 802. Ils 草案没有定义快速无缝切换,车地宽带漫游接入时必须先断开后、重新接入新节点,并且耗时较长,使网络连接中断,无法满足车地宽带接入系统连续宽带接入的要求。 [0009] IEEE 802. Ils draft standard is a wireless multi-hop network good solution, but not specific to the vehicle and development of broadband access systems, so there are shortcomings in the following applications: 1) For the car to broadband access into the system or special straight routing tree topology, a mesh-like IEEE802 ordinary less efficient scheme Ils;. 2) of the draft IEEE 802. Ils fast seamless switching is not defined, the vehicle must be off when roaming access broadband after opening, re-access the new node, and it takes a long time, the network connection is lost, unable to meet the requirements of continuous broadband access by car to broadband access systems.

[0010] IP话音提供了一种在IP网络中传输语音分组的方法,依托于无线宽带接入网络, 能提供廉价、丰富、灵活个人无线通信服务。 [0010] IP voice is provided a method for transmitting voice packets in the IP network, relying on the wireless broadband access networks can provide an inexpensive, abundant, and flexible wireless personal communication service.

[0011] 对于IP话音业务来说,关键的是要满足它的服务质量保障方法(QoS)需求,否则便无法进行有效的话音通信。 [0011] For IP voice services, the key is to meet its service quality assurance methods (QoS) requirements, otherwise it would not be an effective voice communication. 但是众多文献的研究结果表明,基于IEEE 802. 11的无线多跳网络,由于其底层采用类DCF的MAC协议,无法满足IP话音业务所要求的低时延、低时延抖动、低丢包率的QoS需求。 However, many research literature indicates, based on multi-hop IEEE 802.11 wireless network, because the underlying MAC protocol using the DCF class, low delay IP can not meet the required voice services, low delay, low packet loss rate QoS requirements. 经过论文和专利文献检索发现,现有论文或专利中所提出的IP 话音业务的QoS方案,都是假定已经知道从网络上层发过来业务类型,通常的做法是在进行仿真的时候,指定某些数据帧业务为IP话音业务,其它数据包为尽力而为业务。 After papers and patent literature search found that the existing papers or patents QoS scheme proposed IP voice services, are assumed to have been made aware of over the top from the network service type, the usual practice is emulating when certain specified IP data frame as voice traffic services, other data packets of the best effort service. 有些论文虽然提到了要用分类器对业务进行分类,但并没有提出具体的方法,特别是能够应用在实际系统中的方法。 While some papers mention a particular method is to use a classifier classifying traffic, but did not propose specific methods can be applied in real systems.

发明内容 SUMMARY

[0012] 本发明的目的就是提供一种基于无线多跳网络技术的车地宽带接入方法,该方法组网方便、成本低、数据传输速度高,可靠性强。 [0012] The object of the present invention is to provide a method for wireless broadband access to vehicle multi-hop network technique, which network convenience, low cost, high data transmission speed and reliability.

[0013] 本发明实现上述目的所采用的技术方案是:一种基于无线多跳网络技术的车地宽带接入方法,由车载子网的无线节点、通过无线多跳网再接入公共互联网络;其中无线多跳网由多个无线多跳节点组成,无线多跳节点为网关节点或接入节点,接入节点有多个,无线多跳网所使用的协议栈有第1、2层的IEEE 802. Ilg协议,第3层的IP协议。 [0013] The present invention achieves the above object of the technical solution is adopted: in a wireless multi-hop network based on the broadband access technology car method, the sub-board wireless node through wireless multi-hop network and then access the public Internet ; wherein the wireless multi-hop wireless multi-hop network by a plurality of nodes, a wireless multihop node is a gateway node or access node, the access node has a plurality of wireless multi-hop network protocol stack used has a first and second layer IEEE 802. Ilg protocol, IP layer 3 protocol. 并且在第2、 3层协议之间还有基于第2层地址的第2. 5层协议,该第2. 5层协议规定了无线多跳节点的接入方法,该接入方法由以下步骤组成: And between the second, as well as Layer 3 protocol on layer 2 of the 2.5-layer protocol address, the second layer 2.5 protocol provides a method for accessing the wireless multi-hop node, the access method consists of the following steps composition:

[0014] A、每个无线多跳节点生成或更新树型的路由表,记录该无线多跳节点的父、子节点的物理地址;并创建代理表,该代理表包含该节点树型路由以下的所有车载子网节点的表项,每个表项由该节点的物理地址、该节点所代理的车载子网节点的物理地址组成;或者由该节点的子节点的物理地址、该子节点及以下节点所代理的车载子网节点的物理地址组成。 [0014] A, each wireless multihop node tree generated or updated in the routing table of the wireless multi-hop record of the parent node, the physical address of the child node; and creating a proxy table that the proxy node tree routing table contains the following All entries in-vehicle sub-network nodes, each entry of the physical address of the node, a physical address of the node of the subnet node agent vehicle composition; or the physical address of the child node of the node, the child node and the physical address of the node agent's car subnet node composition.

[0015] B、数据帧的传输:无线多跳节点通过路由算法同时结合代理表、路由表的查询,确定路由路径,再调用发送、接收、转发程序,实现无线多跳节点之间、无线多跳网与车载子网之间、无线多跳网关节点与公共互联网之间的数据发送、接收及转发;并在无线多跳网与车载子网之间、无线多跳网关节点与公共互联网之间传输数据时进行格式转换。 [0015] B, the transmission of a data frame: a wireless multi-hop routing algorithm combined by the proxy table, the routing table, determining a routing path, then the call to send, receive, forward program, wireless multi-hop between nodes, a wireless multiple- car jump between network and subnet, wireless multi-hop data between the gateway node and the public Internet to send, receive and forward; and between the wireless multi-hop network and subnet car, wireless multi-hop gateway node between the public Internet transmission data format conversion.

[0016] C、节点的切换:所有无线多跳节点的接入信道都采用相同频率的信道,车载子网节点随时探测其他无线多跳节点的接收信号强度,当正在使用的无线多跳节点的接收功率值低于预定的阈值,且探测到新的无线多跳节点的接收功率值高于该阈值时,在保持旧连接的同时向新接入点发起连接请求;被请求的节点收到请求信号后,更新代理表,建立与该车载子网的连接,然后车载子网请求断开连接,由旧节点断开其连接并更新代理表。 [0016] C, the node switches: all access channel of the wireless multi-hop nodes use the same frequency channel, onboard subnet node always detect received signal strength of another wireless multi-hop node when the wireless multi-hop being used received power value is below a predetermined threshold value, and detects that the received power value of the new wireless multi-hop node is higher than the threshold value, sends a connection request to the new access point while keeping the old connection; requested node receives the request the signal, updating a proxy table to establish a connection to the subnet vehicle, and then request subnet onboard disconnect and disconnect it from the old node table update agent.

[0017] 与现有技术相比,本发明的有益效果是: [0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 一、本发明采用每一节点的路由表只记录其父、子节点,使整个无线多跳网络构成树型路由拓扑结构,将树型路由的根节点(无线网关节点)设置在铁路、公路的中心枢纽位置,而将拓扑结构较上位置的无线节点设置在铁路、公路流量较集中的交汇处;拓扑结构末端的无线节点设置在铁路、公路的沿线各处;使本发明树型拓扑结构与铁路、公路的实际分布结构完全适配,信息需求的流向与路由选择的路径实现最大可能的一致。 [0018] First, the present invention employs each node's routing table only records parent, child nodes, so that the entire wireless multi-hop network topology configuration tree routing, the routing tree root node (wireless gateway node) disposed in the railway , highway hub location, the wireless node topology structure is provided in a position on the rail, road traffic interchange more concentrated; wireless node topology disposed throughout the end structure along the railway, the highway; tree of the present invention topology and the actual distribution structure rail, road completely fit, and the flow-path routing information needs to achieve the greatest possible consensus. 因此,本发明的信息传输效率高,组网方便、成本低。 Thus, high efficiency of information transmission according to the present invention, network convenience and low cost. 同时,路由表只记录其父、子节点,代理表记录自己和子节点以下车载子网节点地址,使得数据传输和接入过程中每个节点只需和自己的父、子节点发生数据交换,提高了传输效率。 Meanwhile, the routing table only records of its parent, the child node, the proxy node table records the own-vehicle sub-network and the sub-node addresses, and so that each node only its own parent, child node has access to the data exchange and data transmission process, improve transmission efficiency.

[0019] 二、路由表及代理表中记录的节点及车载节点地址采用二层MAC地址(节点及车载节点的硬件地址),MAC地址是独立存在于二层,全球范围内独一无二,且不依赖于传统三层路由协议中的IP地址。 [0019] Second, the routing table recorded in the table and the proxy node and the node address of the vehicle-mounted Layer 2 MAC address (hardware address of the node and the node-vehicle), is independent of the MAC address is present in the second floor, globally unique, not dependent traditional Layer 3 routing protocols in the IP address. 所以在极其复杂的无线网络环境中寻找路由时,它具有更强的适应力,能更好地反应网络环境的变化。 So look for the route in a wireless network environment is extremely complex, it has a stronger resilience to better reflect changes in the network environment.

[0020] 三、在传统的因特网中,数据的转发功能都是由第三层(即IP层)来实现的,而本发明数据传输是基于二层MAC地址的2. 5层传输,相对于三层转发具有明显的优点:由于数据包是通过二层来转发的,所以协议栈对它的拆分和封装次数减少,数据包在协议栈内停留的时间也相应地减少,这样就带来了更短的传输延时,更能满足一些对时延敏感业务(如IP话音业务)的服务质量保障要求。 [0020] Third, in the conventional Internet, the data is forwarded by the third function layer (i.e., IP layer) to achieve, and the data transmission of the present invention is 2.5 layer transmission based on Layer 2 MAC addresses, with respect to 3 forwarding has obvious advantages: since the packets are forwarded through the floor, the protocol stack is reduced and split its packaging frequency data packet stays in the stack time is correspondingly reduced, thus bringing a shorter transmission delay, to better meet certain quality service assurance requirements for delay-sensitive services (such as IP voice services) is. 另外,与二层网桥类似,2. 5层转发功能对上层来说是透明的,这样就可以避免由于下层协议变化而造成的对上层协议的影响,从而增加了系统的稳定性。 Further, similar to the bridge floor, 2.5 forwarding function for an upper layer that is transparent, so to avoid the influence of changes in upper layer protocols since the lower layer protocol caused, thereby increasing the stability of the system.

[0021] 四、所有无线多跳节点(网关节点、接入节点)的接入信道都采用相同的频率,车载子网节点即终端节点在切换前,可以不需要进行耗时长的信道扫描过程,在终端节点正在使用的信道上就能随时探测其他接入点的接收信号强度,并在保持旧连接的同时向新接入点发起连接,避免了对所有物理信道的探测造成的物理连接中断,实现完全无缝切换。 [0021] 4. All wireless multihop node (gateway node, the access node) access channel use the same frequency, i.e., the vehicle-mounted terminal node subnet node before the handover, is no need for time-consuming process of scanning channels, the channel being used by the terminal node can always detect the received signal strength of other access points, and to initiate a connection to the new access point while keeping the old connection, to avoid the detection result of physical channels all physical connection is interrupted, fully seamless handover.

[0022] 上述在无线多跳网与车载子网之间、无线多跳网关节点与公共互联网之间传输数据时进行格式转换的具体方法是:在第二层数据帧帧头和第三层的数据帧帧头之间加入第2. 5层的无线多跳帧头,该无线多跳帧头的各字段依次为:数据帧中下一跳物理地址、上一跳物理地址、目的物理地址、源物理地址、无线多跳帧类型字段、业务类型字段。 [0022] The specific method, for transferring data format conversion between the wireless multi-hop node and the public Internet gateway between the wireless multi-hop network and subnet onboard: layer data frame header in the second and third layers was added 2.5 of a data frame header layer between the first wireless multiple-skipping, skipping the header of a wireless multiple-fields as follows: the data frame next hop physical address, the physical address of the jump, the destination physical address, source physical address, a wireless multiple-frame skipping-type field, the service type field.

[0023] 通过这样的格式转换,本发明能够可靠地实现无线多跳网与车载子网之间、无线多跳网关节点与公共互联网之间的数据传输。 [0023] With such format conversion, the present invention can be reliably achieved between the wireless multi-hop network and subnet onboard, multi-hop wireless data transmission between the gateway node and the public Internet. 并且,无线多跳数据帧的帧头中只需要4个MAC地址(上一跳地址、下一跳地址、目的地址、源地址)既可以完成数据转发,使其数据传输高效、可靠。 Header and a wireless multi-hop data frame requires only four MAC address (the next hop address, the next hop address, destination address, source address) data transfer may be complete, so that data transmission efficiency and reliability.

[0024] 上述数据帧的传输的寻址方法为: Addressing method for transmitting the data frame [0024] is:

[0025] 发送数据时的寻址:发送数据时,首先查找代理表,若代理表中存在目的车载节点的物理地址,则将数据帧发送给代理表中对应的无线多跳节点处理;若不存在,则发送给父节点处理。 [0025] When the transmission data addressed: when transmitting data, first find the proxy table, a physical address, the data object if the present vehicle proxy node table frame to the wireless multi-hop corresponding to the processing in the proxy table; if it is present, then sent to the parent node process.

[0026] 接收及转发数据时的寻址:收到数据后,查找路由表,如果路由表中不存在该数据帧的上一跳地址,则确定不是自己父节点和子节点发送的数据帧,该数据帧丢弃;若收到以太网广播数据帧,则由本节点按第3层网络协议进行处理,并同时发送给路由表中除去广播数据帧源节点以外的所有节点;若收到以太网单播数据帧,查找代理表,如果自身即为该数据帧以太网目的地址的代理节点,则由本节点按第3层网络协议进行处理,否则,进行数据的转发,数据转发的寻址方法与发送数据帧相同。 [0026] When the receiving and forwarding addressed data: after receiving the data, searching the routing table, if not the next hop address of the data frame in the routing table, the data frame is not their parent node and child node of the transmission is determined, the discarding the data frame; if broadcast data received Ethernet frame, by the process according to the present node layer 3 network protocol, and transmitted simultaneously to all the nodes other than the source node broadcasts a data frame routing table is removed; If the received Ethernet unicast data frame, a proxy table lookup, if the data frame itself is the proxy node Ethernet destination address, by the local node according to the layer 3 network protocol processing, otherwise forward data, data forwarding addressing method of the transmission data the same frame.

[0027] 以上采用二层路由表和代理表结合的方式实现数据转发和MAC寻址机制,使每个节点传输数据的处理程序简单高效。 [0027] Layer above by way of routing tables and proxy tables bound forward data and MAC addressing mechanism, so that the transmission data processing program of each node simple and efficient. 同时有效的树型路由结构使数据传输的路径优化,从整体上提高了数据传输效率。 While tree routing structure enables efficient data transmission path optimized to improve data transmission efficiency as a whole. 此外,由于转发广播数据帧时,不向广播数据帧源节点转发, 从而完全避免了无线多跳网内广播风暴的产生,进一步提高了系统的稳定性。 Further, since the broadcast forwarding data frames, the data frames are not forwarded to the broadcast source node, thus completely avoiding the multi-hop wireless network broadcast storm is generated, further improving the stability of the system.

[0028] 上述无线多跳协议还包括二层IP话音服务质量保障方法,该方法包括以下步骤: [0028] The protocol further comprises a wireless multi-hop IP Layer voice service quality assurance, the method comprising the steps of:

[0029] 在无线多跳网络的接入节点或网关节点,对数据帧进行识别并对识别出的IP话音数据帧进行标记,即在数据帧的无线多跳帧头的业务类型字段中记录为话音;在数据帧的转发过程中,优先转发带有话音数据帧。 [0029] In the wireless multi-hop access nodes or gateway node of the network, identifying the data frame and the identified IP voice data frame marker, i.e. the data frame skipping header wireless multiple service type field is recorded as speech; during forwarding data frames, the frame forwarding priority with voice data.

[0030] 这样本发明建立了一种在二层MAC地址对IP语音数据帧进行识别,标记的方法。 [0030] Thus the present invention establishes a method of Layer 2 MAC addresses to IP voice data frame identification mark in. 从而能够实际的系统中对IP话音业务采取策略进行特殊对待,以满足其话音服务质量保障的需求。 Thereby enabling the system to take practical strategies for IP voice services for special treatment to meet the needs of its voice quality service guarantees.

[0031] 上述的识别话音数据帧的方法为: [0031] The speech recognition data frames as follows:

[0032] Al、二层IP话音信令捕获:从数据帧中获得建立或拆除IP话音连接时期的信令。 [0032] Al, voice over IP Signaling Capture Layer: obtaining voice over IP signaling connection setup or teardown time from the data frame.

[0033] A2、IP话音信令解析,如解析到的信令为建立连接信令,将获得的IP话音的连接IP地址、传输层端口信息,存入IP话音连接信息库;如解析到的信令为拆除信令,则将连接信息库中的相应的连接IP地址、传输层端口信息删除。 [0033] A2, IP voice signaling resolution, such as voice over IP signaling is parsed to establish a signaling connection, the obtained IP address of the connection, the transport layer port information into IP voice connection repository; resolver to removal signaling is the signaling, the IP address information of the corresponding connection from library is connected to the port information deletion transport layer.

[0034] A3、IP话音业务识别方法,在二层上对所有通过的数据帧帧头中的IP帧头中的目的IP地址和传输层帧头中的目的端口与IP话音连接信息库中的信息进行对比,若信息库中存在该IP地址和相应端口,则将该数据帧标记为话音数据帧。 [0034] A3, IP voice service identification method on the second floor of the destination port and destination IP address of the Voice over IP and transport layer header of all data in the frame header by the IP header connection information repository information comparison, if the IP address and port corresponding to the presence information database, the data frame is marked as a voice data frame.

[0035] 这样,本发明解决了在2. 5层上对IP语音业务进行识别的关键问题,能够准确、简单地识别出传输的IP话音数据帧,使其能在实际应用中对话音实现在转发过程中的优先处理。 [0035] Thus, the present invention solves the problem of identifying a key on the layer 2.5 IP voice service, can accurately and easily recognize IP voice data frame transmission, so that it can be implemented in the speech in the practical application process priority forwarding. 使得IP语音清晰、连续、时延小,满足IP语音通信的服务质量要求。 IP voice so clear, continuous, low delay, meeting quality of service requirements for IP telephony. 使本发明所提出的无线多跳网络技术的车地宽带接入方法更加适用于车地接入这样一个话音业务占很大比重的场景,尤其是对铁路、公路运输的安全具有重要意义。 The wireless proposed by the present invention multi-hop network technology to drive broadband access method is more suitable for such a car to access voice services account for a large proportion of the scene, especially important for safety rail, road transport.

[0036] 上述二层IP话音信令捕获的具体方法是: [0036] The method of the above-described specific voice over IP Signaling Layer are captured:

[0037] 将所有数据帧制作一份副本,从副本中取出数据帧的IP帧头和传输层的传输层报头,获得其中的源IP地址、目的IP地址、源端口、目的端口;并据以确定其消息类型为: H. 225协议的注册认证状态(RAS)消息、H. 225的呼叫信令消息、H. 245控制信令消息、会话初始化协议(SIP)协议消息中的一种,根据得到的消息类型,调用A2步骤中的IP话音信令解析方法;否则丢弃该数据帧副本。 [0037] All data frames to produce a copy, extraction IP transport layer header and the transport layer header of a data frame from the copy, wherein the source IP address is obtained, the destination IP address, source port, destination port; and accordingly determining which message type is: H. status Register 225 authentication protocol (RAS) message, H call signaling message 225, H 245 control signaling message a session Initiation protocol (SIP) protocol message, according to message type obtained, voice over IP call signaling resolution method step A2; otherwise copy of the data frame is discarded.

[0038] 这样,该方法通过获取数据帧拷贝的副本进行解析,而不是对数据帧本身进行解析,不影响数据帧正常传输,保证了数据传输的效率。 [0038] Thus, the method by obtaining a copy of the data frame analyzing copy, instead of analyzing the data frame itself, does not affect the normal data frame transmission to ensure the efficiency of data transmission.

[0039] 上述的A2步骤中IP话音信令解析的具体作法是: [0039] The above-described steps A2 specific voice over IP signaling resolution practice:

[0040] 对H. 225协议的注册认证状态(RAS)消息用ASN. 1 (编码标准)译码器进行解码; 对H. 225的呼叫信令消息或H. 245控制信令消息中的连接建立和拆除的信令用ASN. 1编码标准译码器进行解码;对会话初始化协议(SIP)协议消息的连接建立和拆除的信令用文本协议译码器进行解码。 [0040] H. the notified state protocol 225 (RAS) message decoded by ASN 1 (coding standard) decoder; connection for the call signaling message H. 225 or H. 245 control signaling message setup and teardown signaling decodes ASN 1 encoding standard decoder; connection setup and teardown of the session Initiation protocol (SIP) signaling protocol message decodes the text-based protocol decoder.

[0041] 这样,本方法采取只对含有建立IP语音连接信息的信令进行解析的方式,而不是对所有IP语音进行解析,简化了解析复杂度,提高了解析效率。 [0041] Thus, the method of the present embodiment containing only take up an IP voice connection parsing signaling information, instead of analyzing all IP voice, simplifying the analytical complexity and improve the efficiency of analysis.

[0042] 上述的IP话音连接信息库,包含以下三个信息表:H. 225注册认证状态(RAS)连接信息表,该表的每一个表项包括一个注册认证状态(RAQ传输信道的IP地址和传输层端口;H. 225呼叫信令连接信息表,该表的每一个表项包括一个呼叫信令传输信道的IP地址和传输层端口;话音通信连接信息表,该表的每一个表项包括一个IP话音和视频通信的话音通信协议所用的传输的IP地址和传输层端口。 [0042] The Voice over IP connection information database, comprising the following three information tables:. H 225 registered authentication status (RAS) connection information table, each entry of the table includes a registration authentication state (RAQ transmission channel IP address and transport layer port;. H 225 call signaling connection information table, each entry of the table comprises an IP address and a port layer, transport call signaling transport channel; voice communication connection information table, each entry of the table IP address and a transfer layer comprising a voice communication port IP voice and video communications protocol used is transmitted.

[0043] 这样,通过把IP语音连接的信息划分成几个表,使信息库的结构清晰、明了,方便在信令捕获以及IP话音帧识别的时候的查询对比,也提高了对比的效率。 [0043] Thus, by dividing the information into several IP voice connection table, so that the configuration information repository clear, clear, and easily capture the signaling frame identification query contrast when Voice over IP, but also improve the efficiency of the comparison.

[0044] 下面结合附图和具体的实施方式对本发明作进一步的详细说明。 [0044] The following drawings and the specific embodiments described in further detail in conjunction with the present invention.

附图说明 BRIEF DESCRIPTION

[0045] 图1为本发明实施例接入方法构建的无线多跳网络结构示意图。 [0045] The embodiment of FIG radio access method for constructing a network structure schematic diagram of a multi-hop embodiment of the present invention.

[0046] 图2为本发明实施例接入方法的示意图。 [0046] FIG. 2 is a schematic embodiment of an access method of the present invention.

[0047] 图3为本发明实施例中无线多跳协议层帧结构。 [0047] Example 3 FIG wireless multi-hop protocol layer frame structure of the present invention.

[0048] 图4为本发明实施例中无线多跳协议层帧帧头结构 [0048] FIG. 4 is a schematic embodiment of a multi-hop wireless frame header structure of protocol layers invention

[0049] 图5为本发明实施例的车载子网节点发送数据结构图。 [0049] The transmission data structure of FIG 5 FIG vehicle subnet node according to an embodiment of the present invention.

具体实施方式 detailed description

[0050] 实施例 [0050] Example

[0051] 图1、2示出,一种基于无线多跳网络技术的车地宽带接入方法,由车载子网的无线节点、通过无线多跳网再接入公共互联网络;其中无线多跳网由多个无线多跳节点组成, 无线多跳节点为网关节点Portal或接入节点MAP,接入节点MAP有多个,如MAPI、MAP2、 MAP3。 [0051] FIG. 2 shows a wireless multi-hop network based on the broadband access technology car method, the sub-board wireless node through wireless multi-hop network and then access the public network; wherein the wireless multi-hop a plurality of wireless multi-hop network nodes, wireless multihop node is a gateway node or access node Portal MAP, MAP plurality of access nodes, such as MAPI, MAP2, MAP3. 无线多跳网所使用的协议栈有第1、2层的IEEE 802. Ilg协议,第3层的IP协议。 Wireless multi-hop network protocol stack used in IEEE 802. Ilg has first and second layer protocol, IP protocol layer 3. 并且第2、3层协议之间还有基于第2层地址的第2. 5层协议,该第2. 5层协议规定了无线多跳节点的接入方法。 And also between the second and third layers based on the protocol layer 2 of 2.5-layer protocol address, the second layer protocol defines the 2.5 multi-hop wireless access node. 该接入方法由以下步骤组成: The access method comprising the steps of:

[0052] A、每个无线多跳节点生成或更新树型的路由表,记录该无线多跳节点的父、子节点的物理地址;并创建代理表,该代理表包含该节点树型路由以下的所有车载子网节点的表项,每个表项由该节点的物理地址、该节点所代理的车载子网节点STA的物理地址组成; 或者由该节点的子节点的物理地址、该子节点及以下节点所代理的车载子网节点STA的物理地址组成。 [0052] A, each wireless multihop node tree generated or updated in the routing table of the wireless multi-hop record of the parent node, the physical address of the child node; and creating a proxy table that the proxy node tree routing table contains the following All entries in-vehicle sub-network nodes, each entry of the physical address of the node, the proxy node is a physical address of the STA vehicle composition subnet node; or the physical address of the child node of the node, the child node and the following nodes by agents of the physical address of the subnet node STA-vehicle component.

[0053] B、数据帧的传输:无线多跳节点通过路由算法同时结合代理表、路由表的查询,确定路由路径,再调用发送、接收、转发程序,实现无线多跳节点之间、无线多跳网与车载子网之间、无线多跳网关节点Portal与公共互联网之间的数据发送、接收及转发;并在无线多跳网与车载子网之间、无线多跳网关节点Portal与公共互联网之间传输数据时进行格式转换。 [0053] B, the transmission of a data frame: a wireless multi-hop routing algorithm combined by the proxy table, the routing table, determining a routing path, then the call to send, receive, forward program, wireless multi-hop between nodes, a wireless multiple- car jump between network and subnet, wireless multi-hop data between the gateway node and the public Internet Portal sending, receiving and forwarding; and between the wireless multi-hop network and subnet car, wireless multi-hop gateway node and the public Internet Portal format conversion between the data transmission. 格式转换的方法属于2. 5层协议栈中的数据帧传输数据控制模块。 The method belongs 2.5 format conversion layer protocol stack data frame transmission data control module.

[0054] 图2、3示出,本例根据2. 5层协议栈中的数据帧传输数据控制模块进行格式转换的具体方法是:在第二层数据帧帧头(该帧头由IEEE 802. Ilg MAC模块确定)和第三层数据帧帧头(IP包头)之间加入第2. 5层的无线多跳帧头;图4则示出,该无线多跳帧头的各字段依次为:数据帧中下一跳物理地址、上一跳物理地址、目的物理地址、源物理地址、无线多跳帧类型字段、业务类型字段。 [0054] FIG. 3 shows a specific format conversion method of the present embodiment 2.5 according to the data layer of the protocol stack data frame transmission control module: the second layer data frame header (the header by the IEEE 802 . Ilg MAC module determines) and added to the first layer is 2.5 between the third layer data frame header (IP header) wireless multiple-skipping head; FIG. 4 shows, the wireless multiple fields were skipping head : next hop physical address of the data frame, the upper-hop physical address, the destination physical address, source physical address, a wireless multiple-frame skipping-type field, the service type field.

[0055] 本例数据帧传输时的寻址方法:发送数据时的寻址:发送数据时,首先查找代理表,若代理表中存在目的车载节点的物理地址,则将数据帧发送给代理表中对应的无线多跳节点处理;若不存在,则发送给父节点处理。 [0055] The addressing method when the data frame transmission according to the present embodiment: when transmitting data addressed: when transmitting data, first lookup table proxy, presence of the vehicle when the physical address of the node in the proxy table, the data is sent to the proxy table frame corresponding wireless multi-hop processing node; if not, sending to the parent node process. 接收及转发数据时的寻址:收到数据后,查找路由表,如果路由表中不存在该数据帧的上一跳地址,则确定不是自己父节点和子节点发送的数据帧,该数据帧丢弃;若收到以太网广播数据帧,则由本节点按第3层网络协议进行处理,并同时发送给路由表中除去广播数据帧源节点以外的所有节点;若收到以太网单播数据帧,查找代理表,如果自身即为该数据帧以太网目的地址的代理接入节点,则由本节点按第3层网络协议进行处理,否则,进行数据的转发,数据转发的寻址方法与发送数据帧相同。 When receiving and forwarding addressed data: after receiving the data, searching the routing table, if the upper-hop address of the data frame does not exist in the routing table, the data frame is not their parent node and child node of the transmission is determined, the data frame is discarded ; if broadcast data received Ethernet frame, by the node according to the present layer 3 network protocol processing, and transmitted simultaneously to all the nodes other than the source node broadcasts a data frame routing table is removed; If the received Ethernet unicast data frame, lookup table agent, if the agent itself that is the access node Ethernet destination address of the data frame, by the process according to the present node network protocol layer 3, otherwise, forwarding the data, the data forwarding method of addressing data frame is transmitted the same.

[0056] C、节点的切换:所有无线多跳节点的接入信道都采用相同频率的信道,车载子网节点随时探测其他无线多跳节点的接收信号强度,当正在使用的无线多跳节点的接收功率值低于预定的阈值,且探测到新的无线多跳节点的接收功率值高于预定的阈值时,在保持旧连接的同时向新接入点发起连接请求;被请求的节点收到请求信号,更新代理表,建立与该车载子网的连接,然后车载子网请求断开连接,由旧节点断开其连接更新代理表。 [0056] C, the node switches: all access channel of the wireless multi-hop nodes use the same frequency channel, onboard subnet node always detect received signal strength of another wireless multi-hop node when the wireless multi-hop being used received power value is below a predetermined threshold value, and detects that the received power value of the new wireless multi-hop node is above a predetermined threshold value, initiates a new connection request to the access point while keeping the old connection; receive the requested node request signal, the update agent table, connects to the vehicle subnet, and subnets vehicle disconnect request, the update agent disconnect it from the old node table. 这些节点切换的步骤与方法,属于2. 5层协议栈中的切换模块,如图2所示。 The method steps and switching nodes, are 2.5-layer protocol stack switching module shown in FIG. 2.

[0057] 本例路由表的生成及维护的方法是:在一个网络中首先要选用一个网关节点Portal作为根节点,树形拓扑就是由根节点Portal来主要负责建立和维护的。 [0057] The generation and maintenance of the routing table method of this embodiment is: in a first selection of a network gateway node Portal as the root node, the root node of the tree topology Portal is primarily responsible for establishing and maintaining. 根节点Portal会周期性地发起根广播通知信号,向网络内的其余节点宣告自己的根地位。 Portal root node periodically broadcast notification signal to initiate root, root declare their position to the remaining nodes within the network. 距离较近的能够收到广播消息的非根节点即无线多跳接入节点MAP,收到根广播信号后首先将自己收到的广播信号的上一跳节点设置为自己的父节点,然后再向父节点发起子节点注册消息,最后将收到的根通知消息转发广播出去。 Close distance to receive broadcast messages of non-root nodes i.e. the MAP wireless multi-hop access node, after receiving the first broadcast signal on the root node is set-hop broadcast signal received for their own parent node, then initiating child node registration message to the parent node, the root of the final will receive a notification message forward broadcasts out. 收到该广播的节点,如果之前没有收到广播, 则成为转发广播的上一跳节点的子节点,如此反复下去,便可以快捷地在全网络内建立起树形路由拓扑。 Node receiving the broadcast, if you have not received a broadcast, a child node forwards broadcast on hop node, and so forth down, you can quickly set up the routing topology tree in the whole network. 而在父子表建立完成后,在新的根广播消息的周期中,每个节点都会根据收到的消息来进一步维护自己的父子关系表,比如:删除失效的子节点、增加新的子节点、替换失效的父节点等等。 The father and son at the table Once created, a new cycle in the root of the broadcast message, each node will further safeguard their parent-child relationship table based on the information received, such as: Removes a child node failure, adding new child node, replace a failed parent, and so on.

[0058] 图5示出,利用本发明方法从一个车载子网节点STAl发送数据到另一个车载子网节点STA2的一个具体的寻址实例,主要包括以下几个步骤: [0058] Figure 5 illustrates, using the method of the present invention, data from a vehicle to send a subnet node STAl specific subnet node addressing examples STA2 another vehicle, including the following steps:

[0059] 1、STAl发送的数据由其接入的无线多跳接入节点MAPI进入无线多跳网内部, MAPI首先查找代理表,发现目的地址STA2并不存在于他的代理表项中,因此将数据传给他的父节点一无线多跳网关节点Portal。 [0059] 1, STAl data transmitted by the access node of a wireless multi-hop access into the interior of MAPI wireless multi-hop network, MAPI first lookup table proxy, that the destination address does not exist in his STA2 proxy table entries, so the data passed to his parent node of a wireless multi-hop gateway node Portal.

[0060] 2,Portal节点收到MAPI节点发送的数据帧后,查找代理表,发现目的地址STA2存在于他的代理表项中,代理的子节点为MAP2,于是将数据帧发送给接入节点MAP2。 [0060] 2, the node receives a data frame Portal MAPI sent by the node, the proxy lookup table finds that the destination address is present in the STA2 his proxy table entry, the agent is a child node of MAP2, then transmits a data frame to the access node MAP2.

[0061] 3、同理,MAP2发现目的地址STA2存在于他的代理表项中,代理的子节点为第三个接入节点MAP3,于是将数据帧发送给第三个接入节点MAP3。 [0061] 3. Similarly, MAP2 that the destination address is present in the STA2 his proxy table entry, the child node to a third agent MAP3 access node, then transmitting the data frame to a third access node MAP3.

[0062] 4、MAP3收到数据后查找代理表,发现STA2为自己代理,则将数据发送到STA2。 [0062] 4, MAP3 find proxy table after receiving the data, found himself STA2 agents, the data is sent to STA2.

[0063] 本例的无线多跳协议还包括二层话音(IP话音)服务质量保障方法,该方法包括以下步骤: Multi-hop Wireless Protocol [0063] The present embodiment further includes a speech Layer (IP voice) quality of service guarantee, the method comprising the steps of:

[0064] 在无线多跳网络的接入或网关节点,对数据帧进行识别并对识别出的话音(IP话音)数据帧进行标记,即在数据帧的无线多跳帧头的业务类型字段中记录为话音;在数据帧的转发过程中,优先转发带有话音数据帧。 [0064] or an access gateway node of a wireless multi-hop network, the data frame and the identified speech recognition (IP voice) data frame marker, i.e. in a wireless multiple-data frame skipping the service type field in the header recorded as a voice; during forwarding data frames, the frame forwarding priority with voice data.

[0065] 本例的识别话音数据帧的方法为: [0065] A method for recognizing speech according to the present embodiment of the data frame is:

[0066] Al、二层IP话音信令捕获:从数据帧中获得建立或拆除IP话音连接时期的信令;具体方法是:将所有数据帧制作一份副本,从副本中取出数据帧的IP帧头和传输层的传输层报头,获得其中的源IP地址、目的IP地址、源端口、目的端口。 [0066] Al, voice over IP Signaling Capture Layer: obtaining voice over IP signaling connection setup or teardown time from the data frame; specific method is: the frame making a copy of all data, from the extracted IP data frame copy the transport layer header and the transport layer header, wherein the source IP address is obtained, the destination IP address, source port, destination port. 并确定其是否为以下消息类型中的一种:H. 225协议的注册认证状态(RAS)消息、H. 225的呼叫信令(Call Signaling)消息、H. 245控制信令消息、会话初始化协议(SIP)协议消息;若是,则进行IP 话音信令解析;否则,丢弃该数据帧副本。 And determine whether it is one of the following message types:... H 225 registered authentication protocol status (RAS) message, the call signaling H 225 (Call Signaling) message, H 245 control signaling message, a Session Initiation Protocol (SIP) protocol message; if yes, for voice over IP signaling resolution; otherwise, the copy of the data frame is discarded.

[0067] A2、IP话音信令解析,如解析到的信令为建立连接信令,将获得的IP话音的连接IP地址、传输层端口信息,存入IP话音连接信息库;如解析到的信令为拆除信令,则将连接信息库中的相应的连接IP地址、传输层端口信息删除; [0067] A2, IP voice signaling resolution, such as voice over IP signaling is parsed to establish a signaling connection, the obtained IP address of the connection, the transport layer port information into IP voice connection repository; resolver to removal signaling is the signaling, the IP address information of the corresponding connection from library is connected to the port information deletion transport layer;

[0068] 解析得到连接IP地址、传输层端口的具体方法是: [0068] resolve the IP address connected to the specific method of the transport layer port is obtained:

[0069] 对H. 225协议的注册认证状态(RAS)消息用ASN. 1编码标准译码器进行解码。 [0069] The authentication status register H. 225 protocol (RAS) message decoded by ASN. 1 encoding standard decoder. 解码得到的类型为RAS消息的GRQ(网守请求),GCF(网守确认)消息,取得消息中的RAS信道的IP地址和传输层端口,并更新IP话音连接信息库中的RAS信道信息的部分;如果类型为RAS消息中的ARQ(认证请求),ACF(认证确认)消息,取得消息中的呼叫信令(Call Signaling)信道的IP地址和传输层端口,并更新IP话音连接信息库中的呼叫信令(Call Signaling)信息的部分。 Obtained by decoding type RAS messages the GRQ (Gatekeeper Request), the GCF (Gatekeeper Confirm) message, obtain an IP address and a transport layer port RAS channel message, and updates the IP voice connection RAS channel information database information moiety; If the type is a RAS message ARQ (authentication request), the ACF (authentication acknowledgment) message, and obtains the call signaling message (call signaling) IP address and a transport layer port channel, and updates the voice over IP connection information repository call signaling (call signaling) part of the information.

[0070] 对H. 225的Call Signaling消息或H. 245控制信令消息中的连接建立和拆除的信令用ASN. 1编码标准译码器进行解码;解码结果如果包含H. 245信道的信息,则更新IP 话音连接信息库中的H. 245信道信息的部分;如果其中包含!^86切汁(快速初始化会话单元)消息,取得其中话音通信传输的IP地址和传输层端口,并更新IP话音连接信息库中关于话音通信传输信道信息的部分。 [0070] The connection establishment and removal of H. 225 or H. 245 Call Signaling message control signaling message signaling decodes ASN 1 encoding standard decoder;. If the decoding result contains information of the channel H. 245 , updating IP voice connections repository H. 245 channel information portion;! If contain ^ 86 cut juice (fast initialization session means) message acquires wherein an IP address and a transport layer port voice communication transmission, and updates IP voice connection portion repository voice communication information about the transmission channel.

[0071] 对会话初始化协议(SIP)协议消息的连接建立和拆除的信令用文本协议译码器进行解码。 [0071] The signaling connection establishment and removal of the Session Initiation Protocol (SIP) protocol message decoding text protocol decoder. 解码得到的消息类型为SIP的INVITE (会话邀请)消息,则从其中的CONNECT (连接)字段中得到传输的IP地址,从其中的MEDIA(媒体)字段中得到话音信道的话音通信传输端口,从其中的VEDIO(视频)字段中得到视频信道的话音通信传输端口,然后更新IP 话音连接信息库中的关于话音通信传输信道信息的部分。 Message type obtained by decoding to the SIP the INVITE (session invite) message, from which the CONNECT (connection) field obtained IP address for the transfer, to give voice communication transmission port voice channel from which MEDIA (medium) field, from wherein VEDIO (video) obtained in the field of video transmission channel voice communications port, and then update the IP voice information database section voice communication channel information on a transmission connection.

[0072] 本例的IP话音连接信息库,包含以下信息表: [0072] The present embodiment is connected to Voice over IP information database table contains the following information:

[0073] H. 225RAS连接信息表,该表的每一个表项包括一个RAS传输信道的IP地址和传输层端口;H. 225 Call Signaling(呼叫信令)连接信息表,该表的每一个表项包括一个Call Signaling(呼叫信令)传输信道的IP地址和传输层端口;话音通信连接信息表,该表的每 [0073] H. 225RAS connection information table, each entry of the table comprises an IP address and a transport layer port RAS transport channel;. H 225 Call Signaling (call signaling) connection information table, each table of the table item includes a call signaling (call signaling) transmission channel IP address and port transport layer; voice communication connection information table, which each

一个表项包括一个IP话音和视频通信的话音通信协议所用的传输的IP地址和传输层端□。 A table entry includes an IP address and a transport layer protocol a voice communication terminal □ IP voice and video communications with the transmission.

[0074] A3、IP话音业务识别方法:在二层上对所有通过的数据帧帧头中的IP帧头中的目的IP地址和传输层帧头中的目的端口与IP话音连接信息库中的信息进行对比,若信息库中存在该IP地址和相应端口,则将该数据帧标记为话音数据帧。 [0074] A3, IP voice service identification method: Layer 2 of the destination port of the destination IP address voice over IP and transport layer header of all data in the frame header by the IP header connection information repository information comparison, if the IP address and port corresponding to the presence information database, the data frame is marked as a voice data frame.

[0075] 以下给出一个IP语音通信及其服务质量保障具体实例的细节:[0076] 网关节点Portal上安装有H. 323 (包括H. 225、H. 245协议)IP话音关守服务器。 [0075] The following presents a detail of IP telephony service quality assurance and its specific examples: [0076] attached to H. 323 (including H. 225, H 245 protocol.) Gatekeeper IP voice gateway server node Portal. H. 323协议包括H. 225、H. 245协议。 H. 323 protocol includes H. 225, H. 245 protocol. IP话音关守服务器为IP话音客户端提供注册认证和连接建立服务。 IP voice gatekeeper server provides authentication and registration services for voice over IP connection is established client. 在此实例中,我们还假定,车载子网节点STA和网关节点Portal之间除了一个IP话音通信连接之外,其余的带宽都被其它的业务占满,即网络处于一种高负荷运行的状态。 In this example, we assume that, in addition to a voice IP communication link, the remaining bandwidth are occupied vehicle traffic between subnets other nodes and gateway nodes STA Portal, i.e. the network is in a state of high load operation .

[0077] 一个基于H. 323协议(包括H. 225、H. 245协议)的IP话音语音通信的典型信令交互过程。 [0077] based on H. 323 protocol (including H. 225, H. 245 Protocol) signaling interaction process for a typical voice over IP voice communications. 一个车载无线子网节点STA1,通过网关节点Portal向网关节点Portal外(即未由网关节点Portal代理)另一车载节点STA2发起IP话音呼叫,并由STAl结束此次通信过程: Car radio STAl a subnet node, (i.e., not by the gateway node Agent Portal) originating node via the gateway to the outside of the gateway node Portal Portal another vehicle node STA2 IP voice call, the communication process ends by STAl:

[0078] 在通信开始的时候,STAl向它所注册的网关节点Portal中的关守服务器发送呼叫接入请求(ARQ),其中包含了呼叫的目的地址STA2。 [0078] When the start of communication, STAl gateway node to register it in the Portal server gatekeeper transmits a call access request (ARQ), which contains the destination address of the call STA2. 关守服务器给STAl回复一个认证确认呼叫接入应答消息(ACF),其中包含了STA2的H. 225呼叫控制信道的传输层端口地址1720。 STAl gatekeeper server replies to a call access authentication response message to confirm (ACF), which contains a transport layer port address H. 225 call control channels 1720 STA2.

[0079] 此时STA2的代理节点MAPI截获了这个ACF信令,通过ASN. 1解码器解码后,得到了H. 225呼叫控制信道的IP地址(STA2)和传输层端口1720。 [0079] At this time, the STA2 MAPI proxy node intercepts the ACF signaling, decoded by the ASN. 1 decoder, to obtain the IP address of the H. 225 call control channels (STA2) and the transport layer port 1720. 因此MAPI上的IP话音连接信息库中的H. 225 CallSignaling连接信息表得到了更新,其内容如下: Thus the voice over IP connection information MAPI library H. 225 CallSignaling connection information table has been updated, which reads as follows:

[0080] [0080]

Figure CN101237470BD00111

[0081] STAl接收到这个ACF之后,通过H. 225 CallSignaling信道向STA2发送一个连接建立(SETUP)消息。 [0081] STAl After receiving the ACF, a connection setup (SETUP) message by the H. 225 CallSignaling channel transmitted to STA2. STA2接受这个呼叫,先跟H. 323关守服务器Portal进行ARQ/ACF的信令交换,然后向STAl回复连接(Connect)消息。 STA2 accept the call, to begin with H. 323 gatekeeper Portal server signaling exchange ARQ / ACF then return connection (Connect) message to the STAl.

[0082] 在上述的信令交互过程中,MAPI先截获STAl发出的SETUP信令消息,经过解码后, 得到后期H. 245媒体控制协议所用的IP地址和传输层端口,并更新IP话音连接信息库中H. 245表,其内容如下 [0082] In the aforementioned signaling interaction process, the MAPI intercepts STAl SETUP signaling message sent, after being decoded, to obtain the IP address and port transport layer late H. 245 media control protocol used, and updates the connection information Voice over IP database table H. 245, which reads as follows

[0083] [0083]

Figure CN101237470BD00112

[0084] 而网关节点Portal截获了发往STA2的ACF消息,经过解码后,得到了STAl的H. 225的Call Signaling信道的IP地址和TCP端口,并更新IP话音连接信息库中的H. 225 Call Signaling表,内容如下 [0084] Portal and gateway node intercepts the ACF message to the STA2, after being decoded, to obtain the IP address STAl H. Call Signaling channel 225 and TCP ports, and updates the IP voice connections repository 225 H. Call Signaling table, as follows

[0085] [0085]

Figure CN101237470BD00113

[0086] 接下来,因为已经有STAl的H. 225 CallSignaling信令通道的信息,所以发往STAl的连接(CONNECT)消息被捕获,解码后,得到STA2的后期H. 245媒体控制信道所用的IP地址的TCP端口,于是网关节点中的IP话音连接信息表得到更新,其内容如下: [0086] Next, since the information already H. 225 CallSignaling signaling path STAl, it is sent to STAl connection (the CONNECT) message is captured, decoded, to obtain the post H. STA2 245 media control channel used for IP TCP port address, then the IP voice gateway node connection information table is updated, which reads as follows:

[0087] [0087]

Figure CN101237470BD00114

[0088] 然后STAl和STA2利用所打开的H. 245信道来进行媒体通信,由于在MAPI和网关节点Portal上都已经有H. 245信道的信息,所以能截获这些信令交互。 [0088] Then STAl and STA2 using H. 245 open channel to perform media communication, since the MAPI Portal gateway node already has channel information H. 245, it is possible to intercept these signaling interaction. 这些信令中,最重要的是打开逻辑通道(openLogicCharmel)信令以及打开逻辑通道确认信令(openLogicChannelAck),它们指定了最后IP话音通信所用的IP地址和传输层端口。 These signaling, the most important is the open logical channel (openLogicCharmel) signaling, and open logical channel acknowledgment signaling (openLogicChannelAck), which specify the IP address and port of the last transport layer used in the IP voice communication. 即MAPI截获了STAl发向STA2的openLogicCharmel信令,经过解码后,得到了话音通信所用传输层端口和STA2的IP地址,更新IP话音连接信息库当中话音通信信息表,其内容如下: [0089] I.e. MAPI intercepted STAl sent to openLogicCharmel signaling the STA2, after being decoded, to obtain the IP address of the voice communication transport layer port and STA2 with the updated IP voice connections repository among the voice communication information table, which reads as follows: [0089]

Figure CN101237470BD00121

[0090] 经过上述步骤后,QoS策略中业务识别所要用到的信息已经准备完毕。 [0090] After the above step, QoS policy to use the service identification information has been ready.

[0091] 接下来是IP话音的通信过程:MAP1提取出所有在传输层49156端口的通信包,排入自己的IP话音缓冲队列;网关节点提取出所有在传输层49152端口的通信包,排入自己的IP话音缓冲队列。 [0091] Next IP voice communication process: MAP1 extract all the communication packet in the transport layer port 49156, an IP voice into their buffer queue; gateway node in the communication packet to extract all of the transport layer port 49152, into own IP voice buffer queue.

[0092] 这样,IP话音业务被区分出来后,被放入一个单独的缓冲队列,而其它业务即尽力而为业务则被放入另外一个缓冲队列,由于已假定网络处于拥塞状态,所以,尽力而为业务的队列随时都是接近于满的。 [0092] Thus, the IP voice services to be distinguished, is put into a separate buffer queue, while other services that is best effort traffic queue buffer were placed in another, since the network is in a congestion state has been assumed, therefore, try and for the business of the queue at any time it is close to full. 再假设IP话音业务采用的G. 721语音编码方案,因此根据G. 723的所规定的MP-MLQ编码标准,IP话音业务缓冲队列每30ms便有一个200bit数据帧进入队列。 Suppose G. 721 speech coding scheme employed IP voice services, so G. 723 in accordance with the predetermined coding standard of MP-MLQ, voice over IP traffic buffer queues per 30ms frame will have a 200bit data queued.

[0093] 在此实例中,采用比例概率随机调度算法,配置IP话音队列占有10%的发送概率,尽力而为业务占有90 %的发送概率,设此时的物理层发送速率为54Mbps,而按实验所得数据,此时在MAPI及网关节点Portal两跳的情况下,两个IP话音终端的端到端的速率的10Mbps,假设平均数据包长为lOOObits,则每秒钟可提供10000次的发送机会。 [0093] In this example, the probability proportional scheduling algorithm, a probability of 10% for sending voice over IP queue occupancy, 90% probability of transmission of best effort traffic occupancy, physical layer transmission rate provided in this case is 54Mbps, and the press the obtained experimental data, this time in a case where the gateway node Portal MAPI and two hops, 10Mbps rate of the two end terminals of the voice over IP, assuming that the average length of the packet is lOOObits, the transmission opportunity may be provided per 10,000 times . 此时,缓冲队列的发送过程如下: At this time, the transmission buffer queue as follows:

[0094] 产生一个(0,1)区间的随机数X,如果0<x<0. 1,而IP话音队列获得发送机会, 如果0. 1 < X < 1,则尽力而为业务获得发送机会。 [0094] generating a (0,1) random number X, if 0 <x <0. 1, and the IP voice queue to obtain a transmission opportunity, if 0. 1 <X <1, to obtain the best effort traffic transmission opportunities .

[0095] 根据上述分析,当IP话音业务队列获得发送机会的时候,如果此时队列没有数据帧,将放弃这次发送机会,如果有数据帧,将会立即得到发送。 [0095] According to the above analysis, voice over IP traffic queue when obtaining transmission opportunity, at this time queue if there is no data frame will abandon the transmission opportunity, if the data frame will be sent immediately. 由于单个IP话音连接需要每30毫秒一次的发送机会,相当于每秒种需要大概33次的发送机会,大大小于队列所提供给它的每秒1000次的发送机会,IP话音的服务质量(Q0Q能充分的得到满足。 Since a single IP voice connection requires a transmission opportunity every 30 milliseconds, corresponding transmission opportunity per second requires approximately 33 times, it is much less than 1000 times per second transmission opportunity provided to the queue, the quality of service of Voice over IP (Q0Q fully met.

Claims (7)

  1. 1. 一种基于无线多跳网络技术的车地宽带接入方法,由车载子网的无线节点、通过无线多跳网再接入公共互联网络;其中无线多跳网由多个无线多跳节点组成,无线多跳节点为网关节点或接入节点,接入节点有多个,无线多跳网所使用的协议栈有第1、2层的IEEE 802. Ilg协议,第3层的IP协议,其特征在于:所述的第2、3层协议之间还有基于第2层地址的第2. 5层协议,该第2. 5层协议规定了无线多跳节点的接入方法,该接入方法由以下步骤组成:A、每个无线多跳节点生成或更新树型的路由表,记录该无线多跳节点的父、子节点的物理地址;并创建代理表,该代理表包含该无线多跳节点树型路由以下的所有车载子网节点的表项,每个表项由该无线多跳节点的物理地址、该无线多跳节点所代理的车载子网节点的物理地址组成;或者由该无线多跳节点的子节点的 A method of broadband access to the vehicle based wireless multi-hop network technology, the sub-board wireless node through the wireless multi-hop network and then access the public network; wherein the wireless multi-hop network by a plurality of wireless multi-hop node composition, wireless multi-hop node is a gateway node or access node, the access node has a plurality of wireless multi-hop network protocol used by IEEE 802. Ilg protocol stack has first and second layer, IP protocol layer 3, wherein: between said second and third well layer protocol based on layer 2 protocol layer address 2.5, 2.5 of the second layer protocol defines a method for accessing the wireless multi-hop node, then the the method comprising the steps of: a, each wireless multihop node tree generated or updated in the routing table of the wireless multi-hop record of the parent node, the physical address of the child node; and creating a proxy table that contains the agent table wireless vehicle multi-hop entries of all nodes in the subnet tree routing node down, each entry multihop physical address by the wireless node, the physical address of the wireless multi-hop proxy node composed vehicle subnet node; or a the multi-hop wireless node's children's 理地址、该子节点及以下节点所代理的车载子网节点的物理地址组成;B、数据帧的传输:无线多跳节点通过路由算法同时结合代理表、路由表的查询,确定路由路径,再调用发送、接收、转发程序,实现无线多跳节点之间、无线多跳网与车载子网之间、无线多跳网关节点与公共互联网之间的数据发送、接收及转发;并在无线多跳网与车载子网之间、无线多跳网关节点与公共互联网之间传输数据时进行格式转换;所述格式转换的具体方法是:在第2层数据帧帧头和第3层的数据帧帧头之间加入第2. 5层的无线多跳帧头,该无线多跳帧头的各字段依次为:数据帧中下一跳物理地址、上一跳物理地址、目的物理地址、源物理地址、无线多跳帧类型字段、业务类型字段;C、节点的切换:所有无线多跳节点的接入信道都采用相同频率的信道,车载子网节点随时 Physical address management address, the sub-node and the node agent vehicle composition subnet node; B, transmission data frame: a wireless multi-hop proxy binding table, the routing table by simultaneously routing algorithm, determining a routing path, then call to send, receive, forward procedures, between the wireless multi-hop, multi-hop wireless network and between sub-board, wireless multi-hop data between the gateway node and the public Internet to send, receive and forward; and multi-hop wireless format conversion between the network and the sub-board, the wireless multi-hop transmission of data between the gateway node and the public Internet; the particular format conversion method is: the data frames in a layer 2 frame header and the data layer 3 was added 2.5 of a wireless multiple-layer between the first head frame skipping, skipping the header of a wireless multiple-fields as follows: the physical address of the next hop data frame, the hop physical address, the destination physical address, source physical address , a wireless multiple-frame skipping-type field, the service type field; C handover, node: All wireless multi-hop access channel use the same frequency channel, onboard subnet node at any time 探测其他无线多跳节点的接收信号强度,当正在使用的无线多跳节点的接收功率值低于预定的阈值,且探测到新的无线多跳节点的接收功率值高于该阈值时,在保持旧连接的同时向新的无线多跳节点发起连接请求;被请求的节点收到请求信号后,更新代理表,建立与该车载子网的连接,然后车载子网请求断开旧连接,由旧节点断开其连接并更新代理表。 When detecting other wireless multihop received signal strength of a node, when the received power value of the radio multihop node being used is lower than a predetermined threshold value, and the detected reception power value of new wireless multi-hop node is higher than the threshold value, the holding At the same time the old connection to launch new wireless multi-hop connection request; after the requested node receives the request signal, updated proxy table, establish a connection with the car subnets, subnet car then disconnect the old connection request, from the old disconnect node and update the proxy table.
  2. 2.如权利要求1所述的一种基于无线多跳网络技术的车地宽带接入方法,其特征在于,所述的数据帧的传输的寻址方法为:发送数据时的寻址:发送数据时,首先查找代理表,若代理表中存在目的车载子网节点的物理地址,则将数据帧发送给代理表中对应的无线多跳节点处理;若不存在,则发送给父节点处理;接收及转发数据时的寻址:收到数据后,查找路由表,如果路由表中不存在该数据帧的上一跳地址,则确定不是自己父节点和子节点发送的数据帧,该数据帧丢弃;若收到以太网广播数据帧,则由本节点按第3层网络协议进行处理,并同时发送给路由表中除去广播数据帧源节点以外的所有节点;若收到以太网单播数据帧,查找代理表,如果自身即为该数据帧以太网目的地址的代理节点,则由本节点按第3层网络协议进行处理,否则,进行数据的转 2. one of the claim 1 to the vehicle-based wireless multi-hop method of broadband access network technology, characterized in that the method of addressing data frames transmitted is: when transmission data addressed: transmitting data, the first lookup table proxy, presence of the vehicle when the physical address of the proxy table subnet node, the data frames to the corresponding proxy table wireless multi-hop processing node; if not, the process is sent to the parent node; when receiving and forwarding addressed data: after receiving the data, searching the routing table, if the upper-hop address of the data frame does not exist in the routing table, the data frame is not their parent node and child node of the transmission is determined, the data frame is discarded ; if broadcast data received Ethernet frame, by the node according to the present layer 3 network protocol processing, and transmitted simultaneously to all the nodes other than the source node broadcasts a data frame routing table is removed; If the received Ethernet unicast data frame, agent lookup tables, if the data frame is the self proxy node Ethernet destination address, by the process according to the present node network protocol layer 3, otherwise, the data transfer ,数据转发的寻址方法与发送数据帧相同。 , Addressing method of data forwarding same data frame is transmitted.
  3. 3.如权利要求1所述的一种基于无线多跳网络技术的车地宽带接入方法,其特征在于:所述的第2. 5层协议还包括第2层IP话音服务质量保障方法,该方法包括以下步骤: 在无线多跳网络的接入或网关节点,对数据帧进行识别并对识别出的IP话音数据帧进行标记,即在数据帧的无线多跳帧头的业务类型字段中记录为话音;在数据帧的转发过程中,优先转发带有话音数据帧。 3. one of the claim 1 to the vehicle-based wireless multi-hop method of broadband access network technology, wherein: said first protocol layer further comprises 2.5 Layer 2 IP voice quality service protection method, the method comprises the steps of: a multi-hop radio access network or a gateway node, identifying the data frame and the identified IP voice data frame marker, i.e. multi-frame skipping in a radio data frame header of the service type field recorded as a voice; during forwarding data frames, the frame forwarding priority with voice data.
  4. 4.如权利要求3所述的一种基于无线多跳网络技术的车地宽带接入方法,其特征在于:所述的对数据帧进行识别并对识别出的IP话音数据帧进行标记的方法为:Al、第2层IP话音信令捕获:从数据帧中获得建立或拆除IP话音连接时期的信令;A2、IP话音信令解析:如解析到的信令为建立连接信令,将获得的IP话音的连接IP地址、传输层端口信息,存入IP话音连接信息库;如解析到的信令为拆除信令,则将连接信息库中的相应的连接IP地址、传输层端口信息删除;A3、IP话音业务识别方法:在第2层上对所有通过的数据帧帧头中的IP帧头中的目的IP地址和传输层帧头中的目的端口与IP话音连接信息库中的信息进行对比,若信息库中存在该IP地址和相应端口,则将该数据帧标记为话音数据帧。 4. one of the claim 3, the vehicle-based broadband access method of wireless multi-hop network technology, characterized by: a method to identify and recognize the voice over IP data frame to the tag of the data frame is: of Al, layer 2 IP voice signaling capture: obtaining voice over IP signaling connection setup or teardown time from the data frame; A2, voice over IP signaling resolution: the signaling is resolved to establish a signaling connection, the IP address of the IP voice connections obtained port information of the transport layer, IP voice connection into the repository; resolver removal signaling is the signaling to the corresponding connection IP address information from library is connected to the transmission port information layer delete; A3, IP voice services recognition method: in the second layer and voice over IP port for the purposes of all object data frame header in the IP header by the IP address in the header and the transport layer connection information repository information comparison, if the IP address and port corresponding to the presence information database, the data frame is marked as a voice data frame.
  5. 5.如权利要求4所述的一种基于无线多跳网络技术的车地宽带接入方法,其特征在于:所述的Al步骤中第2层IP话音信令捕获的具体方法是:将所有数据帧制作一份副本,从副本中取出数据帧的IP帧头和传输层的传输层报头, 获得其中的源IP地址、目的IP地址、源端口、目的端口;并据以确定其消息类型为:H. 225 协议的注册认证状态(RAS)消息、H. 225的呼叫信令消息、H. 245控制信令消息、会话初始化协议(SIP)协议消息中的一种,根据得到的消息类型,调用A2步骤中的IP话音信令解析方法;否则丢弃该数据帧副本。 5. An claim 4, wherein the vehicle-based wireless multi-hop method of broadband access network technology, characterized in that: said specific method steps in Al Layer 2 IP voice is captured signaling: all Make a copy of the data frame, copies removed from the transport layer header of the IP header and the transport layer data frame is obtained wherein the source IP address, destination IP address, source port, destination port; and accordingly determine its message type :... H authentication status register 225 protocol (RAS) message, H call signaling message 225, H 245 control signaling message a session Initiation protocol (SIP) protocol message, according to the message type obtained, voice over IP call signaling resolution method step A2; otherwise copy of the data frame is discarded.
  6. 6.如权利要求4所述的一种基于无线多跳网络技术的车地宽带接入方法,其特征在于:所述的A2步骤中IP话音信令解析的具体作法是:对H. 225协议的注册认证状态(RAQ消息用ASN. 1编码标准译码器进行解码;对H. 225 的呼叫信令消息或H. 245控制信令消息中的连接建立和拆除的信令用ASN. 1编码标准译码器进行解码;对会话初始化协议(SIP)协议消息的连接建立和拆除的信令用文本协议译码器进行解码。 According to a 4-on vehicle as claimed in claim broadband access the wireless multi-hop network technology method, characterized in that: said step A2 of the voice over IP signaling resolution specific practice: on H. 225 protocol the authentication status register (RAQ message decodes ASN 1 encoding standard decoder; establishing and dismantling a connection call signaling message H. 225 or H. 245 of the control signaling in a signaling message with ASN 1 encoding. standard decoder decoding; connection setup and teardown of the session Initiation protocol (SIP) signaling protocol message decodes the text-based protocol decoder.
  7. 7.如权利要求4所述的一种基于无线多跳网络技术的车地宽带接入方法,其特征在于,所述的IP话音连接信息库,包含以下三个信息表:H. 225注册认证状态(RAS)连接信息表,该表的每一个表项包括一个注册认证状态(RAQ传输信道的IP地址和传输层端口; H. 225呼叫信令连接信息表,该表的每一个表项包括一个呼叫信令传输信道的IP地址和传输层端口;话音通信连接信息表,该表的每一个表项包括一个IP话音和视频通信的话音通信协议所用的传输的IP地址和传输层端口。 Register 225 authentication H: 7. The one of claims 4 to broadband access method based on vehicle multi-hop wireless network technology, characterized in that said voice connection IP information database table contains the following three information. status (RAS) connection information table, each entry of the table includes a registration authentication state (RAQ transmission channel IP address and port transport layer; H. 225 call signaling connection information table, each entry of the table comprises a call signaling transport channel IP address and a transport layer interface; the voice communication connection information table, each entry of the table comprises an IP address and a transport layer port of a voice communication protocol IP voice and video communication used is transmitted.
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