WO2013091228A1 - 一种紧急呼叫场景下传输最小数据集的方法、装置及系统 - Google Patents

一种紧急呼叫场景下传输最小数据集的方法、装置及系统 Download PDF

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Publication number
WO2013091228A1
WO2013091228A1 PCT/CN2011/084506 CN2011084506W WO2013091228A1 WO 2013091228 A1 WO2013091228 A1 WO 2013091228A1 CN 2011084506 W CN2011084506 W CN 2011084506W WO 2013091228 A1 WO2013091228 A1 WO 2013091228A1
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WIPO (PCT)
Prior art keywords
msd
data frame
mgw
transmission protocol
analog
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PCT/CN2011/084506
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English (en)
French (fr)
Inventor
周卫强
Original Assignee
华为技术有限公司
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.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/084506 priority Critical patent/WO2013091228A1/zh
Priority to CN201180003046.3A priority patent/CN103548383A/zh
Publication of WO2013091228A1 publication Critical patent/WO2013091228A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/102Gateways
    • H04L65/1023Media gateways
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066Session management
    • H04L65/1069Session establishment or de-establishment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066Session management
    • H04L65/1096Supplementary features, e.g. call forwarding or call holding

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a method, device, and system for transmitting a minimum data set in an emergency call scenario.
  • the system will automatically make an emergency voice call to the local emergency agency, the Public Safety Answering Point (PSAP) center, during the call, the user equipment on the vehicle (User Equipment,
  • PSAP Public Safety Answering Point
  • the UE transmits the minimum set of data (MSD) information of the vehicle to the PSAP center through the voice channel of the wireless network.
  • MSD information can be vehicle location information, time stamp, passenger, vehicle identification number, and other related accident information; the PSAP Center will dispatch resources such as ambulances, fire trucks, and rescue personnel based on information such as MSD for real-time rescue.
  • the eCal l call mainly performs the transmission and reception of the MSD through the voice channel, and the Mobi le Switching Center (MSC) is only responsible for transparent transmission.
  • the MSC includes a Media Gateway (MGW) and a Media Gateway Controller (MGC).
  • MGW is responsible for the control of the bearer
  • MGC is responsible for the control of the signaling.
  • NTN Next Generation Network
  • the transmission mode is transmitted through the IP network, and the analog MSD signal is transmitted.
  • the number of data packets to be transmitted is large, which may result in a large packet loss probability.
  • the delay of the analog signal transmission packet will cause a certain segment of data to be blank during demodulation, resulting in demodulation failure and unreliable data transmission. Summary of the invention
  • the embodiment of the invention provides a method, a device and a system for transmitting a minimum data set in an emergency call scenario, which are used to solve the problem that the transmission is unreliable due to data packet loss or delay when the IP network transmits the analog MSD signal.
  • Embodiments of the present invention provide a method for transmitting a minimum data set in an emergency call scenario, including:
  • the media gateway MGW receives the analog MSD signal sent by the user equipment UE;
  • the embodiment of the invention further provides a media gateway, including:
  • a receiving unit configured to receive an analog MSD signal sent by the user equipment UE
  • a processing unit configured to perform demodulation, hybrid automatic repeat request decoding, and cyclic redundancy check on the analog MSD, to obtain an MSD data frame corresponding to the analog MSD;
  • a determining unit configured to determine an IP transmission protocol of the MSD data frame
  • a sending unit configured to send the MSD data frame to the public response security point PSAP center according to the IP transmission protocol determined by the determining unit.
  • the embodiment of the invention further provides a system for transmitting a minimum data set MSD in an emergency call scenario, including:
  • a UE configured to send an analog MSD to a media gateway MGW;
  • An MGW configured to receive an analog MSD sent by the UE, and perform the simulated MSD Demodulation, hybrid automatic repeat request decoding, and cyclic redundancy check, acquiring an MSD data frame, determining an IP transmission protocol of the MSD data frame, and transmitting the MSD data frame to a public response security point PSAP according to the IP transmission protocol center;
  • the PSAP center is configured to receive an MSD data frame sent by the MGW.
  • the MGW demodulates the analog MSD signal, acquires the MSD data frame, and transmits the data frame to the PSAP center through the IP network.
  • the number of data packets is reduced, thereby reducing the probability of packet loss, and eliminating the influence of the delay of the analog MSD signal that needs to be transmitted in real time, thereby improving the reliability of the transmission.
  • Embodiment 1 is a flowchart of a method according to Embodiment 1 of the present invention.
  • Embodiment 3 is a flowchart of a method according to Embodiment 3 of the present invention.
  • FIG. 4 is a structural diagram of an MGW according to Embodiment 4 of the present invention.
  • FIG. 5 is a structural diagram of a system according to Embodiment 5 of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • Embodiment 1 of the present invention is a diagrammatic representation of Embodiment 1 of the present invention.
  • the MGW receives and extracts an MSD data frame, encapsulates the MSD into an IP transmission protocol format, and performs the following transmission process:
  • the media gateway MGW receives the analog MSD signal sent by the user equipment UE; the UE initiates an ecall emergency call, and sends the analog MSD signal and the voice signal to the MGW, where the analog MSD signal is a waveform corresponding to the MSD.
  • the MGW demodulates the analog MSD signal to obtain an MSD data frame corresponding to the simulated MSD.
  • the MSD data frame is in a digital format instead of an analog signal.
  • the MSD of the embodiment of the present invention may have a maximum of 140 bytes, and may include one or more types of information such as vehicle identification information, vehicle location, and time stamp.
  • the format of the IP transport protocol of the MSD is the IP transport protocol format in the networking where the MGW is located.
  • the Session Initiation Protocol (SIP) has high reliability in NGN.
  • the Real-Time Transport Protocol (RTP) transmission protocol can be supported in most communication devices, and the RTP transmission is reliable. Can be guaranteed, so at MGW and MGC
  • the IP transport protocol in the network where it is located can use SIP or RTP.
  • the MGW sends the MSD data frame to the MGC, so that the MGC encapsulates the MSD data frame according to the SIP protocol format, and sends the encapsulated MSD data frame to the PSAP center according to the SIP protocol. If the determined IP transmission protocol is the SIP protocol, the MGW encapsulates the MSD data frame according to the format of the RTP protocol, and sends the encapsulated MSD data frame to the PSAP center.
  • the MSD method provided in this embodiment demodulates the analog MSD signal by the MGW, acquires the MSD data frame, encapsulates the MSD data frame into an IP transmission protocol data packet, and transmits the data packet to the PSAP center through the IP network, and directly transmits the analog MSD signal. It is said that the number of data packets is reduced, thereby reducing the probability of packet loss, and at the same time eliminating the influence of the delay of the analog MSD signal that needs to be transmitted in real time, and improving the reliability of the transmission.
  • Embodiment 2 of the present invention is a diagrammatic representation of Embodiment 2 of the present invention.
  • the MGW receives and extracts the MSD, and the MGC encapsulates the MSD into a SIP data packet, and the transmission process is as follows:
  • the UE initiates an emergency call, and the MSC establishes a voice channel for the UE to enable the UE to make a voice call with the PSAP.
  • the UE can make a voice call with the PSAP center.
  • the UE may initiate an MSD request message, or the PSAP center may initiate an MSD request message.
  • the request message is sent by using a voice channel, and may be a request identifier.
  • the identifier name may be: Request_MSD.
  • the embodiments of the present invention are not limited thereto.
  • the MGW receives the request message and returns a request. Confirm the message to the UE.
  • the MGW transparently transmits the request message to the UE.
  • the UE sends the voice data to the MGW, where the voice data carries the analog MSD signal. If the UE initiates the MSD request message, after receiving the request confirmation message sent by the MGW, the UE sends the voice signal to the MGW in real time, and the voice is in the voice.
  • the signal carries the analog MSD signal.
  • the specific method may be: carrying the message whose header is the MSD identifier in the voice data, and the content of the message is the MSD.
  • the MSD identifier may be HEAD_MSD, and the embodiment of the present invention does not limit the MSD identifier.
  • the voice data and MSD are modulated and sent to the MGW.
  • the UE After receiving the MSD request message sent by the MGW, the UE sends the voice data to the MGW in real time, and carries the MSD in the voice data.
  • the specific method is the same as the case where the UE initiates an MSD request.
  • the voice data and MSD are modulated and sent to the MGW.
  • the MGW extracts an MSD data frame.
  • the MGW sends the MSD to the MGC
  • the MGC returns an acknowledgement message to the MGW
  • the MSD size is 140 bytes. After the MGC receives the MSD data frame, confirm the MSD If the transmission has been completed, a confirmation message is returned. If the received MSD data is less than 140 bytes, retransmission is required, and the confirmation message is returned until the received MSD size is 140 bytes.
  • MGC encapsulates the MSD into a SIP data packet
  • the IP transmission protocol format of the MSD data frame is an IP transmission protocol format in the networking where the MGW and the MGC are located.
  • SIP packets have high transmission reliability in NGN, so the IP transmission protocol in the network where MGW and MGC are located can use SIP. Therefore, after the MGC returns an acknowledgment message, the MSD is encapsulated into a SIP packet.
  • the MGC sends the SIP data packet to the PSAP.
  • the MGC sends the SIP packet to the PSAP over the signaling link.
  • the PSAP returns a confirmation message.
  • the PSAP After receiving the SIP packet, the PSAP parses the MSD data and returns a confirmation message to the MGC.
  • the PSAP displays the MSD.
  • the MSD is extracted by the MGW, and the MGC encapsulates the MSD into a SIP data packet for transmission.
  • the number of data packets is reduced, thereby reducing the probability of packet loss and eliminating the need.
  • the analog MSD signal transmitted in real time is affected by the delay, which improves the reliability of the transmission.
  • Embodiment 3 of the present invention is a diagrammatic representation of Embodiment 3 of the present invention.
  • the MGW extracts and encapsulates the MSD into a Real-Time Transport Protocol (RTP) data packet, and the process of sending the data packet to the PSAP is as follows:
  • RTP Real-Time Transport Protocol
  • the MGW encapsulates the MSD into an RTP data packet.
  • the IP transmission protocol format of the MSD is an IP transmission protocol format in the networking where the MGW and the MGC are located.
  • the IP transport protocol uses the RTP transport protocol, because the RTP transport protocol can be supported in most communication devices, and the reliability of the RTP transmission can be ensured. Therefore, the MGW responsible for bearer control directly encapsulates the MSD into an RTP packet format instead of the MGC responsible for signaling control.
  • the specific encapsulation mode can be:
  • the specific RTP format includes two formats: a header and a payload. An RTP header indicates that the type of the payload is PT.
  • the RTP packet type is MSD.
  • PT 113.
  • the specific PT identifier is not limited here. After defining the PT, add a 140-byte MSD to the payload.
  • the MGW sends an RTP data packet to the PSAP.
  • the MGW After the MGW encapsulates the MSD into the RTP packet, it sends the packet to the PSAP.
  • the PSAP returns an acknowledgement message to the MGW.
  • the PSAP receives the RTP packet, parses the packet, obtains the MSD data, and then returns a confirmation message to the MGW.
  • PSAP displays MSD.
  • the MSD method provided in this embodiment extracts the MSD through the MGW and encapsulates the MSD into an RTP data packet for transmission. Compared with directly transmitting the analog MSD signal, the number of data packets is reduced, thereby reducing the probability of packet loss, and eliminating the need for real-time The transmitted analog MSD signal is affected by the delay, which improves the reliability of the transmission.
  • Embodiment 4 of the present invention An embodiment of the present invention provides an MGW. As shown in FIG. 4, the method includes:
  • the receiving unit 401 is configured to receive an analog MSD sent by the user equipment UE.
  • the UE initiates an ecall call, and sends an analog MSD signal and a voice signal to the MGW.
  • the processing unit 402 is configured to perform demodulation on the analog MSD, hybrid automatic repeat request decoding, and cyclic redundancy check, to obtain an MSD data frame corresponding to the simulated MSD.
  • a determining unit 403 configured to determine an IP transmission protocol of the MSD data frame
  • the determining unit determines that the IP transmission protocol of the MSD data frame is an IP transmission protocol used by the networking architecture in which the MGW is located.
  • a sending unit 404 configured to send, according to the IP transmission protocol determined by the determining unit
  • the MGW sends the MSD data frame to the MGC, so that the MGC encapsulates the MSD data frame according to the format of the IP transmission protocol, and sends the encapsulated MSD data frame to the PSAP center according to the IP transmission protocol.
  • the encapsulating unit 405 is configured to encapsulate the MSD data frame according to a format of an IP transport protocol.
  • the receiving unit receives the analog MSD
  • the processing unit processes the MSD data frame
  • the encapsulating unit encapsulates the MSD data frame according to the IP transmission protocol
  • the sending unit sends the encapsulated MSD.
  • Embodiment 5 of the present invention further provides a communication system, as shown in FIG. 5, including: a user equipment 501, configured to send an analog MSD to a media gateway;
  • the media gateway 502 is configured to receive an analog MSD sent by the UE, perform demodulation, hybrid automatic retransmission request decoding, and cyclic redundancy check on the analog MSD, acquire an MSD data frame, and determine an IP of the MSD data frame. a transmission protocol, transmitting the MSD data frame to a public response security point PSAP center according to the IP transmission protocol;
  • the media gateway 502 may also send the MSD data frame to the media gateway controller, so that the media gateway controller encapsulates the MSD data frame according to the format of the IP transmission protocol, and sends the encapsulated MSD data frame according to the IP transmission protocol. Go to the PSAP Center.
  • the media gateway controller 503 is configured to receive the MSD data frame sent by the media gateway, and send the encapsulated MSD data frame to the PSAP center according to the IP transmission protocol.
  • the PSAP center 504 is configured to receive an MSD data frame sent by the MGW.
  • the user equipment sends an analog MSD to the media gateway, and the media gateway receives and processes the MSD data frame, encapsulates it into an IP transmission protocol format, and sends the data frame.
  • the number of data packets is reduced, thereby reducing the probability of packet loss, and at the same time eliminating the influence of the delay of the analog MSD signal that needs to be transmitted in real time, and improving the reliability of the transmission.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative, for example, the division of the unit is only a logical function division, and the actual implementation There may be additional ways of dividing, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a hardware plus software functional unit.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the above software functional units are stored in a storage medium and include a number of steps for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods of the various embodiments of the present invention.
  • the foregoing storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and the like.
  • the medium of the program code includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and the like.

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Abstract

本发明实施例提供一种紧急呼叫场景下传输最小数据集的方法,包括:媒体网关MGW接收用户设备UE发送的模拟MSD信号;对所述模拟MSD进行解调,获取所述模拟MSD对应的MSD数据帧;确定所述MSD数据帧的IP传输协议,按照所述IP传输协议发送所述MSD数据帧到公共应答安全点PSAP中心。相应地,本发明实施例还提供一种媒体网关以及一种通信系统,相对直接传输模拟MSD信号来说,减少了数据包的数量,进而降低了丢包概率,同时消除了需要实时传输的模拟MSD信号受到时延的影响,提高了传输的可靠性。

Description

一种紧急呼叫场景下传输最小数据集的方法、 装置及系统
技术领域
本发明实施例涉及通信技术领域, 尤其涉及一种紧急呼叫场景下传输 最小数据集的方法、 装置及系统。
背景技术
当交通工具, 如车辆发生碰撞或出现严重事故时, 紧急呼叫
( Emergency Cal l , eCal l ) 系统会自动拨打紧急语音呼叫给当地应急机 构, 即公共安全应答点 (Publ ic Safety Answering Point , PSAP ) 中心, 在通话过程中, 车辆上的用户设备 ( User Equipment, UE )会通过无线网 络的语音通道将车辆的最小数据集 (Minimum Set of Data, MSD )信息传 输给 PSAP中心。 MSD信息可以为车辆位置信息、 时间戳记、 乘客、 车辆识 别号, 以及其他相关事故信息; PSAP中心将根据 MSD等信息派出急救车、 消防车、 抢救人员等资源, 进行实时救援。
现有技术中, eCal l呼叫主要通过语音通道来完成 MSD的发送与接收, 而移动交换中心 (Mobi le Switching Center , MSC ) 只是负责透传。 MSC 包含媒体网关 (Media Gateway, MGW )和媒体网关控制器( Media Gateway Control ler , MGC ) 。 MGW负责承载的控制, MGC负责信令的控制。 在现有 的下一代网络(Next Generation Network , NGN ) 网络中, 传输方式是通 过 IP网络进行传输, 传输模拟的 MSD信号, 需要传输的数据包数量多, 会 导致数据的丢包概率大, 而且模拟信号传输数据包的时延会造成解调时候 某一段数据空白, 造成解调失败, 数据传输不可靠。 发明内容
本发明实施例提供一种紧急呼叫场景下传输最小数据集的方法、 装置 及系统, 用于解决 IP网络传输模拟 MSD信号时由于数据丢包或时延导致 传输不可靠的问题。
本发明实施例提供一种紧急呼叫场景下传输最小数据集的方法, 包 括:
媒体网关 MGW接收用户设备 UE发送的模拟 MSD信号;
对所述模拟 MSD信号进行解调,获取所述模拟 MSD信号对应的 MSD 数据帧;
确定所述 MSD数据帧的 IP传输协议, 按照所述 IP传输协议发送所 述 MSD数据帧到公共应答安全点 PSAP中心。
本发明实施例还提供一种媒体网关, 包括:
接收单元, 用于接收用户设备 UE发送的模拟 MSD信号;
处理单元, 用于对所述模拟 MSD进行解调、 混合自动重发请求解码 以及循环冗余校验, 获取所述模拟 MSD对应的 MSD数据帧;
确定单元, 用于确定所述 MSD数据帧的 IP传输协议;
发送单元, 用于按照所述确定单元确定的 IP传输协议发送所述 MSD 数据帧到公共应答安全点 PSAP中心。
本发明实施例还提供一种紧急呼叫场景下传输最小数据集 MSD的系 统, 包括:
UE, 用于发送模拟 MSD至媒体网关 MGW;
MGW, 用于接收所述 UE发送的模拟 MSD, 对所述模拟 MSD进行 解调、 混合自动重发请求解码以及循环冗余校验, 获取 MSD数据帧, 确 定所述 MSD数据帧的 IP传输协议, 按照所述 IP传输协议发送所述 MSD 数据帧到公共应答安全点 PSAP中心;
PSAP中心, 用于接收所述 MGW发送的 MSD数据帧。
通过本发明实施例提供的方法、 装置和系统, MGW对模拟 MSD信 号进行解调, 获取 MSD数据帧, 并通过 IP网络传输至 PSAP中心。 相对 直接传输模拟 MSD信号来说, 减少了数据包的数量, 进而降低了丢包概 率, 同时消除了需要实时传输的模拟 MSD信号受到时延的影响, 提高了 传输的可靠性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对 实施例或现有技术描述中所需要使用的附图作一筒单地介绍, 显而易见 地, 下面描述中的附图是本发明的一些实施例, 对于本领域普通技术人员 来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附 图。
图 1为本发明实施例一的方法流程图;
图 2为本发明实施例二的方法流程图;
图 3为本发明实施例三的方法流程图;
图 4为本发明实施例四的 MGW结构图;
图 5为本发明实施例五的系统结构图。 具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本 发明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描 述, 显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做出创造性劳动的前 提下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例一:
如图 1所示, 本发明实施例中, 在紧急呼叫场景下, MGW接收并提 取 MSD数据帧, 封装 MSD成 IP传输协议格式并进行传输的流程如下:
5101、 媒体网关 MGW接收用户设备 UE发送的模拟 MSD信号; UE发起 ecall紧急呼叫, 将模拟 MSD信号和语音信号发送到 MGW, 这里的模拟 MSD信号为 MSD对应的波形图。
5102、 MGW对模拟 MSD信号进行解调,获取模拟 MSD对应的 MSD 数据帧;
这里, MSD数据帧为数字格式, 而不是模拟信号。
5103、 确定 MSD数据帧的 IP传输协议, 按照 IP传输协议发送 MSD 数据帧到公共应答安全点 PSAP中心。
需要说明的是, 本发明实施例的 MSD最多可以有 140字节, 可以包 括车辆识别信息、 车辆位置, 以及时间戳等信息的一种或多种。 MSD 的 IP传输协议格式为 MGW所在的组网中的 IP传输协议格式。 会话发起协 议 ( Session Initiation Protocol, SIP ) 在 NGN中传输可靠性较高, 实时传 输协议( Real-Time Transport Protocol , RTP )传输协议在绝大多数的通信 设备中都能支持, 且 RTP传输的可靠能够得到保障, 故在 MGW和 MGC 所在的组网中的 IP传输协议可以采用 SIP或 RTP。 若确定的 IP传输协议 是 SIP协议, 则 MGW发送 MSD数据帧至 MGC, 以使 MGC按照 SIP协 议格式对所述 MSD 数据帧进行封装, 并按照 SIP 协议发送封装之后的 MSD数据帧到 PSAP中心。 若确定的 IP传输协议是 SIP协议, 则 MGW 按照 RTP协议的格式对所述 MSD数据帧进行封装, 并发送封装之后的 MSD数据帧到 PSAP中心。
本实施例提供的 MSD方法, 通过 MGW对模拟 MSD信号进行解调, 获取 MSD数据帧, 封装 MSD数据帧成 IP传输协议数据包, 并通过 IP网 络传输至 PSAP中心, 相对直接传输模拟 MSD信号来说, 减少了数据包 的数量, 进而降低了丢包概率, 同时消除了需要实时传输的模拟 MSD信 号受到时延的影响, 提高了传输的可靠性。
本发明实施例二:
如图 2所示, 本发明实施例中, 在紧急呼叫场景下, MGW接收并提 取 MSD, MGC封装 MSD成 SIP数据包, 并进行传输的流程如下:
S201、 发起 ecall呼叫, 建立语音通道;
在 NGN网络中, UE发起紧急呼叫, MSC为 UE建立语音通道, 以 使 UE能够与 PSAP进行语音通话。在建立语音通道之后, UE可以和 PSAP 中心进行语音通话。 在语音通话的过程中, 可以是 UE发起 MSD请求消 息, 也可以是 PSAP中心发起 MSD请求消息。 所述请求消息通过语音通 道进行发送, 具体可以是请求标识, 例如标识名称可以为: Request_MSD。 本发明实施例对此不 限制。
UE发起 MSD请求消息的情况下, MGW收到该请求消息, 返回请求 确认消息至 UE。
PSAP发起 MSD请求消息的情况下, MGW收到该请求消息后, 透传 该请求消息至 UE。
5202、 UE发送语音数据至 MGW, 语音数据中携带模拟 MSD信号; UE发起 MSD请求消息的情况下,在收到 MGW发送的请求确认消息 之后, UE实时发送语音信号给 MGW,并在所述语音信号中携带模拟 MSD 信号, 具体做法可以是: 在所述语音数据中携带报头为 MSD标识的报文, 4艮文内容即为 MSD。 所述 MSD标识可以为 HEAD_MSD , 本发明实施例 对 MSD标识不做限制。 语音数据和 MSD经过调制之后发送至 MGW。
PSAP发起 MSD请求消息的情况下, 在收到 MGW发送的 MSD请求 消息之后, UE 实时发送语音数据给 MGW, 并在所述语音数据中携带 MSD。具体做法与 UE发起 MSD请求的情况下是一样的。语音数据和 MSD 经过调制之后发送至 MGW。
5203、 MGW提取 MSD数据帧;
由于语音数据是在模拟信号传输,在 NGN中,传输的都是 IP数据包。 因此, 要在 MGW中对模拟信号进行模拟 /数字 (Analog/Digital, A/D )转 换、 混合自动重发请求(Hybrid - Automatic Repeat Request, H-ARQ)解码 CRC校验, 得到的数字信号即是语音数据和 MSD数据帧。 可以将报头为 MSD标识的报文提取出来, 得到 MSD。
S204a、 MGW发送 MSD至 MGC;
S204b、 MGC返回确认消息至 MGW;
通常 MSD大小为 140字节。 MGC收到 MSD数据帧后, 确认 MSD 已经发送完毕, 则返回确认消息。 如果收到的 MSD数据不足 140字节, 则要求重新发送, 一直到收到的 MSD大小为 140字节时, 返回确认消息。
5205、 MGC封装 MSD成 SIP数据包;
在本发明实施例中, MSD数据帧的 IP传输协议格式为 MGW和 MGC 所在的组网中的 IP传输协议格式。 SIP数据包在 NGN中传输可靠性较高, 故在 MGW和 MGC所在的组网中的 IP传输协议可以采用 SIP。因此, MGC 返回确认消息之后, 对 MSD封装成 SIP数据包。
5206、 MGC发送 SIP数据包至 PSAP;
MGC通过信令链路将 SIP数据包发送给 PSAP。
S207、 PSAP返回确认消息;
PSAP收到 SIP数据包后, 经过解析得到 MSD数据,返回确认消息至 MGC。
S208、 PSAP显示 MSD。
本实施例提供的 MSD方法, 通过 MGW提取 MSD , MGC封装 MSD 成 SIP数据包进行发送, 相对直接传输模拟 MSD信号来说, 减少了数据 包的数量, 进而降低了丢包概率, 同时消除了需要实时传输的模拟 MSD 信号受到时延的影响, 提高了传输的可靠性。
本发明实施例三:
如图 3所示, 本发明实施例中, 在紧急呼叫场景下, MGW提取并封 装 MSD成实时传输协议 ( Real-Time Transport Protocol, RTP )数据包, 发送至 PSAP的流程如下:
S301— S303同 S201— 203; 5304、 MGW封装 MSD成 RTP数据包;
在本发明实施例中, MSD的 IP传输协议格式为 MGW和 MGC所在 的组网中的 IP传输协议格式。 由于 RTP传输协议在绝大多数的通信设备 中都能支持,且 RTP传输的可靠能够得到保障,故本发明实施例中, MGW 所在的组网架构中, IP传输协议采用的是 RTP传输协议。 因此, 负责承 载控制的 MGW直接对 MSD封装成 RTP数据包格式, 而不是通过负责信 令控制的 MGC来进行封装操作。 具体封装方式可以是: 具体的 RTP格式 中包含报头和有效负载两种格式。 RTP的报头中, 有一项表示负载的类型 名称为 PT, 本实施例中可以定义其为某一特定的数据, 用于标识该 RTP 数据包类型是 MSD。 例如: PT=113。 具体的 PT标识在此不做限定。 定义 好 PT之后, 在有效负载中添加大小为 140字节的 MSD。
5305、 MGW发送 RTP数据包至 PSAP;
MGW将 MSD封装进 RTP数据包之后, 发送该数据包至 PSAP。
5306、 PSAP返回确认消息至 MGW;
PSAP收到 RTP数据包, 解析该数据包, 得到 MSD数据, 之后返回 确认消息至 MGW。
5307、 PSAP显示 MSD。
本实施例提供的 MSD方法, 通过 MGW提取 MSD并封装 MSD成 RTP数据包进行发送, 相对直接传输模拟 MSD信号来说, 减少了数据包 的数量, 进而降低了丢包概率, 同时消除了需要实时传输的模拟 MSD信 号受到时延的影响, 提高了传输的可靠性。
本发明实施例四: 本发明实施例提供一种 MGW, 如图 4所示, 包括:
接收单元 401 , 用于接收用户设备 UE发送的模拟 MSD;
UE发起 ecall呼叫, 将模拟 MSD信号和语音信号发送给 MGW。 处理单元 402, 用于对模拟 MSD进行解调、 混合自动重发请求解码 以及循环冗余校验, 获取模拟 MSD对应的 MSD数据帧;
确定单元 403 , 用于确定 MSD数据帧的 IP传输协议;
其中, 确定单元确定 MSD数据帧的 IP传输协议为 MGW所在的组网 架构使用的 IP传输协议。
发送单元 404, 用于按照所述确定单元确定的 IP传输协议发送所述
MSD数据帧到公共应答安全点 PSAP中心。
在其中, 发送所述 MSD数据帧到公共应答安全点 PSAP中心之前,
MGW发送 MSD数据帧到 MGC, 以使所述 MGC按照 IP传输协议的格式 对所述 MSD数据帧进行封装, 并按照 IP传输协议发送封装之后的 MSD 数据帧到所述 PSAP中心。
封装单元 405 , 用于按照 IP传输协议的格式对所述 MSD数据帧进行 封装。
本实施例提供的 MGW, 接收单元接收模拟 MSD, 处理单元处理得到 MSD数据帧, 封装单元按照 IP传输协议对 MSD数据帧进行封装, 发送 单元对封装之后的 MSD进行发送。相对直接传输模拟 MSD信号来说, 减 少了数据包的数量, 进而降低了丢包概率, 同时消除了需要实时传输的模 拟 MSD信号受到时延的影响, 提高了传输的可靠性。
本发明实施例五: 本发明实施例还提供一种通信系统, 如图 5所示, 包括: 用户设备 501 , 用于发送模拟 MSD至媒体网关;
媒体网关 502,用于接收所述 UE发送的模拟 MSD ,对所述模拟 MSD 进行解调、 混合自动重发请求解码以及循环冗余校验, 获取 MSD数据帧, 确定所述 MSD数据帧的 IP传输协议,按照所述 IP传输协议发送所述 MSD 数据帧到公共应答安全点 PSAP中心;
媒体网关 502也可以发送 MSD数据帧至媒体网关控制器, 以使媒体 网关控制器按照所述 IP传输协议的格式对所述 MSD数据帧进行封装, 并 按照 IP传输协议发送封装之后的 MSD数据帧到 PSAP中心。
媒体网关控制器 503 , 用于接收媒体网关发送的 MSD数据帧, 并按 照 IP传输协议发送封装之后的 MSD数据帧到 PSAP中心。
PSAP中心 504, 用于接收所述 MGW发送的 MSD数据帧。
本实施例提供的系统, 用户设备发送模拟 MSD至媒体网关, 媒体网 关接收并处理得到 MSD数据帧, 将其封装成 IP传输协议格式并发送。 相 对直接传输模拟 MSD信号来说, 减少了数据包的数量, 进而降低了丢包 概率, 同时消除了需要实时传输的模拟 MSD信号受到时延的影响, 提高 了传输的可靠性。
本领域普通技术人员可以理解: 附图只是一个实施例的示意图, 附图 中的单元或流程并不一定是实施本发明所必须的。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统, 设备 和方法, 可以通过其它的方式实现。 例如, 以上所描述的设备实施例仅仅 是示意性的, 例如, 所述单元的划分, 仅仅为一种逻辑功能划分, 实际实 现时可以有另外的划分方式, 例如多个单元或组件可以结合或者可以集成 到另一个系统, 或一些特征可以忽略, 或不执行。 另一点, 所显示或讨论 的相互之间的耦合或直接耦合或通信连接可以是通过一些接口, 设备或单 元的间接耦合或通信连接, 可以是电性, 机械或其它的形式。 作为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地 方, 或者也可以分布到多个网络单元上。 可以根据实际的需要选择其中的 部分或者全部单元来实现本实施例方案的目的。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处理单元 中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在 一个单元中。 上述集成的单元既可以采用硬件的形式实现, 也可以采用硬 件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元, 可以存储在一个计算 机可读取存储介质中。 上述软件功能单元存储在一个存储介质中, 包括若 干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络 设备等)执行本发明各个实施例所述方法的部分步骤。 而前述的存储介质 包括: U盘、 移动硬盘、 只读存储器( Read-Only Memory, 筒称 ROM ) 、 随机存取存储器 ( Random Access Memory, 筒称 RAM ) 、 磁碟或者光盘 等各种可以存储程序代码的介质。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对 其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通 技术人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修 改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、 一种紧急呼叫场景下传输最小数据集 MSD的方法, 其特征在于, 包括:
媒体网关 MGW接收用户设备 UE发送的模拟 MSD信号;
对所述模拟 MSD信号进行解调,获取所述模拟 MSD信号对应的 MSD 数据帧;
确定所述 MSD数据帧的 IP传输协议, 按照所述 IP传输协议发送所 述 MSD数据帧到公共应答安全点 PSAP中心。
2、 根据权利要求 1所述的方法, 其特征在于, 所述按照所述 IP传输 协议发送所述 MSD数据帧到所述 PS AP中心, 包括:
发送所述 MSD数据帧至媒体网关控制器 MGC,以使所述 MGC按照 所述 IP传输协议的格式对所述 MSD数据帧进行封装, 并按照所述 IP传 输协议发送所述封装之后的 MSD数据帧到所述 PSAP中心。
3、 根据权利要求 2所述的方法, 其特征在于, 所述 IP传输协议为会 话发起协议 SIP。
4、 根据权利要求 1所述的方法, 其特征在于, 所述按照所述 IP传输 协议发送所述 MSD数据帧到所述 PSAP中心, 包括:
所述 MGW按照所述 IP传输协议的格式对所述 MSD数据帧进行封装, 并按照所述 IP传输协议发送所述封装之后的 MSD数据帧到所述 PSAP中
5、 根据权利要求 4所述的方法, 其特征在于, 所述 IP传输协议为实 时传输协议 RTP。
6、 一种媒体网关 MGW, 其特征在于, 包括:
接收单元, 用于接收用户设备 UE发送的模拟 MSD信号;
处理单元, 用于对所述模拟 MSD进行解调、 混合自动重发请求解码 以及循环冗余校验, 获取所述模拟 MSD对应的 MSD数据帧;
确定单元, 用于确定所述 MSD数据帧的 IP传输协议;
发送单元, 用于按照所述确定单元确定的 IP传输协议发送所述 MSD 数据帧到公共应答安全点 PSAP中心。
7、 根据权利要求 6所述的 MGW, 其特征在于, 所述发送单元用于: 发送 MSD数据帧到媒体网关控制器 MGC, 以使所述 MGC按照所述
IP传输协议的格式对所述 MSD数据帧进行封装,并按照所述 IP传输协议 发送所述封装之后的 MSD数据帧到所述 PSAP中心。
8、 根据权利要求 7所述的 MGW, 其特征在于, 所述 IP传输协议为 会话发起协议 SIP。
9、 根据权利要求 6所述的 MGW, 其特征在于, 所述 MGW还包括: 封装单元, 用于按照所述 IP传输协议的格式对所述 MSD数据帧进行 封装。
10、 根据权利要求 9所述的 MGW, 其特征在于, 所述 IP传输协议为 实时传输协议 RTP。
11、 一种紧急呼叫场景下传输最小数据集 MSD的系统, 包括用户设 备 UE, 媒体网关 MGW, 公共应答安全点 PSAP中心, 其中
所述 UE, 用于发送模拟 MSD信号至媒体网关 MGW;
所述 MGW, 用于接收所述 UE发送的模拟 MSD, 对所述模拟 MSD 进行解调、 混合自动重发请求解码以及循环冗余校验, 获取 MSD数据帧, 确定所述 MSD数据帧的 IP传输协议,按照所述 IP传输协议发送所述 MSD 数据帧到公共应答安全点 PSAP中心;
所述 PSAP中心, 用于接收所述 MGW发送的 MSD数据帧。
12、 根据权利要求 11所述的系统, 其特征在于, 所述系统还包括: 媒体网关控制器 MGC,用于接收所述 MGW发送的所述 MSD数据帧, 并按照所述 IP传输协议发送所述封装之后的 MSD数据帧到所述 PSAP中
13、 根据权利要求 11所述的系统, 其特征在于, 所述 MGW还用于: 发送所述 MSD数据帧至媒体网关控制器 MGC, 以使所述 MGC按照 所述 IP传输协议的格式对所述 MSD数据帧进行封装, 并按照所述 IP传 输协议发送所述封装之后的 MSD数据帧到所述 PSAP中心。
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