WO2008000138A1 - Base station system and method for call setting up, handing over and relaeasing in hybrid network - Google Patents

Base station system and method for call setting up, handing over and relaeasing in hybrid network Download PDF

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Publication number
WO2008000138A1
WO2008000138A1 PCT/CN2007/001762 CN2007001762W WO2008000138A1 WO 2008000138 A1 WO2008000138 A1 WO 2008000138A1 CN 2007001762 W CN2007001762 W CN 2007001762W WO 2008000138 A1 WO2008000138 A1 WO 2008000138A1
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WO
WIPO (PCT)
Prior art keywords
mode
bts
bsc
call
tdm
Prior art date
Application number
PCT/CN2007/001762
Other languages
English (en)
French (fr)
Inventor
Xiaowen Zhang
Qunfeng Shang
Yi Liu
Zhangyi Chen
Hai Peng
Original Assignee
Alcatel Lucent
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Lucent filed Critical Alcatel Lucent
Priority to KR1020087029483A priority Critical patent/KR101336684B1/ko
Priority to US12/305,581 priority patent/US8189534B2/en
Priority to EP07721335.3A priority patent/EP2037692B1/en
Publication of WO2008000138A1 publication Critical patent/WO2008000138A1/zh
Priority to US13/369,691 priority patent/US8644257B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12Access point controller devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0066Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • H04W88/10Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/04Interfaces between hierarchically different network devices
    • H04W92/12Interfaces between hierarchically different network devices between access points and access point controllers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/04Interfaces between hierarchically different network devices
    • H04W92/14Interfaces between hierarchically different network devices between access point controllers and backbone network device

Definitions

  • Base station system in hybrid networking and call setup, handover and release processing method thereof
  • the present invention relates to a base station system (BSS) in a hybrid network supporting both IP and legacy TDM, and a call setup, handover and release processing method thereof.
  • BSS base station system
  • a conventional BSS Base Station Subsystem
  • BTS Base Transceiver Station
  • BSC Base Station Controller
  • MFS Packet Service Server
  • TC Packet Type Converter
  • BTS Base Transceiver Station
  • MSC Packet Service Server
  • TC Packet Type Converter
  • All transmissions of the system are based on TDM (Time Division Multiplexing) mode, and the control plane and user plane are not specifically distinguished.
  • TDM Time Division Multiplexing
  • BSC its external interface involves the ABIS interface from the BTS and the Ater interface from the TC.
  • TC its external interface involves the A interface with the MSC.
  • the IP network Compared with the above traditional TDM network, the IP network has been very mature and the operation and maintenance cost is low. Therefore, the convergence of various transmission networks to IP networks is an inevitable trend in the telecommunications industry.
  • the present invention aims to provide a hybrid network base station system supporting both IP and conventional TDM and a call setup, handover and release processing method thereof.
  • One of the inventions is a base station controller. It is connected between several BTSs and TCs in TDM mode, IP/TDM hybrid mode and IP mode respectively, and is characterized in that it comprises a call link controller based on IP/TDM mode on the base station controller body, respectively
  • the IP/TDM mode call link controller is connected to the first signaling interface controller and the second signaling interface controller, and the IP packet forwarding unit, wherein: the IP/TDM mode call link controller is configured to process a process of establishing, switching, and releasing a voice, data call link in the case of IP transmission or IP/TDM hybrid transmission; a first signaling interface controller, configured to process signaling transmission with the TC, and control The establishment and release process of the exchange link of the voice channel on the internal interface of the TC and the voice channel on the Ater interface; the second signaling interface controller is configured to process the IP, TDM or IP/TDM with the BTS Signaling and voice transmission in mixed mode; control BTS in IP mode or IP/TDM hybrid mode The establishment
  • the base station controller further includes an M2UA located in the SS7 link controller of the base station controller body, configured to support all-IP transmission of the system, and bear the signaling connection of the SS7 between the BSC and the TC. barge.
  • M2UA located in the SS7 link controller of the base station controller body, configured to support all-IP transmission of the system, and bear the signaling connection of the SS7 between the BSC and the TC. barge.
  • a second aspect of the invention is a code type converter. It is used in conjunction with the base station controller described above, characterized in that it comprises a channel transform unit based on the body of the pattern converter and an IP voice/data frame receiving/transmitting unit, and a seventh letter connected to the channel transform unit a TDM/IP conversion unit, wherein: a channel transform unit, configured to receive a control signal of a first signaling interface controller of the base station controller, and process various channels of the A interface and an Ater interface in an IP, TDM or IP/TDM mode Link exchange; IP voice/data frame receiving/transmitting unit, for receiving the control signal of the first signaling interface controller of the base station controller, processing the packing and solution of the voice frame in the IP transmission mode between the TC and the BTS Packet receiving and transmitting; No. 7 signaling TDM/IP conversion unit, for processing the mutual conversion between the TDM transmission mode and the IP transmission mode.
  • a base transceiver station supporting IP transmission comprises a BTS body, characterized in that it further comprises an IP mode call processing unit based on the BTS body, an IP voice/data frame receiving/transmitting unit, and the IP voice/data frame receiving/transmitting unit and the IP mode call respectively An Ethernet physical interface connected to the processing unit, where: an IP mode call processing unit, configured to process a process of establishing, switching, and releasing a voice call link under control of a second signaling interface controller of the BSC; IP voice/data frame The receiving/transmitting unit is configured to process, perform packet unpacking and sending of the voice frame in the IP transmission mode between the TC and the BTS.
  • a base transceiver station supporting IP transmission comprises a BTS body, characterized in that it further comprises an IP mode call processing unit based on the BTS body, an IP voice/data frame receiving/transmitting unit, and an IP voice/data frame receiving/transmitting unit, an IP mode call, respectively.
  • the E1-based IP transport protocol processing unit and the IP mode call processing unit connected to the E1 physical interface on the BTS body are configured to process the establishment and handover of the voice call link under the control of the BSC second signaling interface controller.
  • an IP voice/data frame receiving/transmitting unit configured to process, in an IP transmission mode, a packet, a packet receiving and transmitting of a voice frame between the TC and the BTS; an E1-based IP transmission protocol processing unit, In the case where E1 is used as a physical transmission medium, IP data packets are transmitted between the BTS and the BSC.
  • a base station system of a hybrid networking It has the above-mentioned BSC, the above-mentioned TC connected to the BSC, and a plurality of BTSs, wherein it also includes a bandwidth-guaranteed IP network provided between the BSC, the TC and the BTS, and simultaneously supports IP between the BSC and the TC.
  • BTS is a BTS supporting TDM transmission or a BTS supporting IP transmission.
  • the exchange link control signaling transmission between the TC and the BSC adopts the TCSL protocol mode, so as to be established on the Ater interface in the hybrid networking.
  • Traditional TDM transmission In the above-mentioned base station system of the hybrid network, in the IP mode transmission, the signaling transmission between the BSC and the BTS adopts a UDP-based D channel link access protocol.
  • the No. 7 signaling transmission between the TC and the BSC adopts the M2UA protocol mode.
  • the user plane transmission between the TC and the BTC adopts a UDP-based TRAUP protocol.
  • a method for processing a call setup in a hybrid network base station system based on TDM mode transmission comprises the following steps: after receiving the call setup request from the MSC, the TC converts the seventh signaling based on the TDM mode transmission into the seventh signaling based on the IP mode transmission, and then forwards it to the BSC; the BSC receives the After the call setup request of the TC, the radio resource is allocated, the call type is checked, the BTS of the mobile terminal is located in the TDM mode, and then the TC exchange link establishment request is sent to the TC, and the exchange link is established inside the BSC and sent to the BTS.
  • Wireless channel allocation request the system establishes uplink and downlink based on voice channel activation in TDM mode transmission.
  • a method for processing a call setup in a hybrid network base station system based on IP mode transmission comprises the following steps: after receiving the call setup request from the MSC, the TC converts the seventh signaling based on the TDM mode transmission into the seventh signaling based on the IP mode transmission, and then forwards it to the BSC; the BSC receives the After the call setup request of the TC, allocate radio resources, check the call type, determine the BTS of the mobile terminal in the IP mode, and then send a radio channel allocation request to the BTS; the BTS sends a voice channel connection establishment request to the TC; the system transmits based on the IP mode The voice channel is activated, and the uplink and downlink are established.
  • a hybrid network base station system implements a call handover method of a mobile terminal from a TDM mode to an IP mode BTS.
  • the method includes the following steps: a) During a call transmission based on the TDM mode, the BSC receives a call handover request originating from an internal trigger of the MSC or the BSC: For a call handover request triggered by the MSC, when the TC receives the call from the TC After the call handover request of the MSC, the seventh signaling based on the TDM mode is converted into the seventh signaling based on the IP mode transmission, and then forwarded to the BSC, and proceeds to step 2); for the call handover request triggered internally by the BSC, Go directly to step 2): 2) After receiving the internal or external call handover request, the BSC allocates radio resources, checks the call type, determines that the mobile terminal is in the TDM mode BTS, and then sends a radio channel allocation request to the IP mode BTS; c) IP The mode
  • a hybrid network base station system implements a call handover method of a mobile terminal from an IP mode to a TDM mode BTS.
  • the method includes the following steps: a) During the call transmission based on the IP mode, the BSC receives the source Call-switching request triggered by the MSC or the BSC: For the call handover request triggered by the MSC, when the TC receives the call handover request from the MSC, the TC converts the No. 7 signaling based on the TDM mode into an IP-based transmission. Signal No. 7 is then forwarded to the BSC and proceeds to step 2).
  • step 2) For the call handover request triggered by the BSC, go directly to step 2): 2) After receiving the internal or external call handover request, the BSC allocates radio resources and checks the call. Type, determining that the mobile terminal is located in the IP mode BTS, sending a TC exchange link setup request to the TC, and simultaneously establishing an internal exchange link, and then transmitting a radio channel allocation request to the TDM mode BTS; and 3) transmitting the voice channel connection to the TC in the TDM mode BTS Establishing a request; 4) The system activates the voice channel based on the TDM mode, and establishes an uplink and a downlink; 5) The TDM mode BTS sends a successful access indication to the BSC; 6) The BSC sends a radio channel release request to the IP mode BTS The BTS sends a switching link release request to the TC.
  • Type determining that the mobile terminal is located in the IP mode BTS, sending a TC exchange link setup request to the TC, and simultaneously establishing an internal exchange link
  • a method for processing a call release in a hybrid network base station system based on TDM mode transmission comprises the following steps: after receiving the call release request from the MSC, the TC converts the seventh signaling based on the TDM mode transmission into the seventh signaling based on the IP mode transmission, and then forwards it to the BSC; the BSC receives the After the call release request of the TC, a wireless channel release request is sent to the BTS in the TDM mode, and a TC exchange link release request is issued to the TC, and the exchange link is released inside the BSC; the voice channel transmitted based on the TDM mode is released.
  • a method for processing a call release in a hybrid network base station system based on IP mode transmission comprises the following steps: after receiving the call release request from the MSC, the TC converts the seventh signaling based on the TDM mode transmission into the seventh signaling based on the IP mode transmission, and then forwards it to the BSC; the BSC receives the After the call release request of the TC, the wireless channel release request is sent to the BTS of the IP mode; the IP mode BTS sends a TC exchange link release request to the TC; and the voice channel transmitted based on the IP mode is released.
  • the present invention has the following advantages:
  • the compatibility with the TDM ensures maximum protection of the operator's investment; the operator can smoothly transition from TDM to IP, reducing the risk; and being flexible in selecting different Physical and data link transmission equipment carries IP, which is convenient for operators to network; there are a large number of silent frames in voice services.
  • IP mode data services can easily share these bandwidths (to ensure voice quality, priority of data services) Below the voice).
  • 3G, WiMax ie global microwave access interoperability
  • BSC can be simplified to a signaling server; IP mode control
  • IP mode control are completely independent, simplifying development and maintenance costs.
  • 1 is a schematic structural view of a conventional BSS
  • 2 is a schematic structural diagram of a base station system in a hybrid networking of the present invention
  • FIG. 3 is a flowchart of a process for establishing a call in a TDM-based mode in a hybrid network base station system according to the present invention
  • FIG. 4 is a flowchart of a process for establishing a call in an IP-based mode in a hybrid network base station system according to the present invention
  • Figure 5 (a) is a flow chart of the hybrid network base station system of the present invention implementing call handover (MSC-triggered call handover) of the mobile terminal from the TDM mode to the IP mode BTS;
  • MSC-triggered call handover MSC-triggered call handover
  • FIG. 5(b) is a flowchart of a hybrid network base station system of the present invention for implementing a call handover of a mobile terminal from a TDM mode to an IP mode BTS (BSC internally triggered call handover);
  • BSC IP mode BTS
  • FIG. 6( a) is a flowchart of a hybrid network base station system of the present invention for implementing a call handover (an MSC triggered call handover) of a mobile terminal from an IP mode to a TDM mode BTS;
  • FIG. 6(b) is a flowchart of a hybrid network base station system of the present invention for implementing a call handover of a mobile terminal from an IP mode to a TDM mode BTS (BSC internally triggered call handover);
  • BSC internally triggered call handover
  • Figure ⁇ is a flow chart of the process of the call release in the TDM mode transmission according to the hybrid network base station system of the present invention
  • Figure 8 is a flow chart of the process of the call release in the IP-based mode transmission by the hybrid network base station system of the present invention.
  • FIG. 9 is a schematic structural diagram of a base station controller according to the present invention.
  • Figure 10 is a schematic structural view of a code type converter of the present invention.
  • Figure 11 (a) is a schematic diagram of one of the structures of the base transceiver station of the present invention.
  • Figure 11 (b) is a schematic diagram of the second structure of the base transceiver station of the present invention. detailed description
  • the present invention is a hybrid networked base station system, including a BSC, a TC connected to the BSC, and a plurality of BTSs, wherein it also includes a bandwidth provided between the BSC, the TC, and the BTS.
  • the guaranteed IP network, and both IP and traditional TDM transmissions are supported between the BSC and the TC.
  • the BTS can be a BTS supporting TDM transmission or a BTS supporting IP transmission.
  • the base station controller (BSC)
  • the base station controller (BSC) is connected between several BTSs and TCs in the TDM mode, the IP/TDM hybrid mode, and the IP mode, respectively, including the IP/TDM mode call based on the base station controller body 1.
  • the IP/TDM mode call link controller 12 is configured to process voice in the case of IP transmission or IP/TDM hybrid transmission, The process of establishing, switching, and releasing data call links;
  • the first signaling interface controller 13 is configured to process signaling transmission with the TC, and control the establishment and release process of the exchange link of the voice channel on the internal interface of the TC and the voice channel on the Ater interface;
  • a second signaling interface controller 12 configured to process signaling and voice transmission in an IP, TDM or IP/TDM hybrid mode with the BTS; and control BTS in an IP mode or an IP/TDM hybrid mode Establishment and release of a voice channel between TCs;
  • the IP packet forwarding unit 14 is responsible for forwarding IP data packets.
  • the base station controller may further include an M2UA (MTP2 User Adaptation Layer) 15 located in the SS7 link controller of the base station controller body 1 for supporting the all-IP transmission of the system, and undertaking the BSC and the TC. Signaling connection between SS7.
  • M2UA MTP2 User Adaptation Layer
  • the pattern converter (TC) includes a channel converting unit 22 based on the pattern converter body 2 and an IP voice/data frame receiving/transmitting unit 23, and a seventh letter connected to the channel converting unit 22.
  • TDM/IP conversion unit 21 Let the TDM/IP conversion unit 21, where:
  • the channel changing unit 22 is configured to receive a control signal of the first signaling interface controller 13 of the base station controller, and process link exchange between various channels of the A interface and the Ater interface in an IP, TDM or IP/TDM mode;
  • the IP voice/data frame receiving/transmitting unit 23 is configured to receive the control signal of the first signaling interface controller 13 of the base station controller, and process the packetization and unpacking of the voice frame in the IP transmission mode between the TC and the BTS. Send
  • the No. 7 signaling TDM/IP conversion unit 21 is configured to process the mutual conversion between the TDM transmission mode and the IP transmission mode.
  • BTS Base Transceiver Station supporting IP transmission
  • a BTS supporting IP transmission includes a BTS body 3, an IP mode call processing unit 31 based on the BTS body 3, an IP voice/data frame receiving/transmitting unit 32, and the The IP voice/data frame receiving/transmitting unit 32 and the IP mode call processing unit 31 are connected to an Ethernet physical interface 33, where:
  • the IP mode call processing unit 31 is configured to process a process of establishing, switching, and releasing a voice call link under the control of the BSC second signaling interface controller 11;
  • the IP voice/data frame receiving/transmitting unit 32 is configured to process the packetization, unpacking, receiving and transmitting of the voice frame in the IP transmission mode between the TC and the BTS.
  • a base transceiver station supporting IP transmission including a BTS body 3', based on the BTS ontology 3' IP mode call processing unit 3, IP voice/data frame receiving/transmitting unit 32', and respectively with the IP voice/data frame receiving/transmitting unit 32', IP mode call processing unit 31' and BTS body 3 'E1 based IP transport protocol processing unit 33' connected to the upper E1 physical interface 34',
  • the IP mode call processing unit is configured to process the establishment, switching, and release of the voice call link under the control of the BSC second signaling interface controller 11;
  • the IP voice/data frame receiving/transmitting unit 32' is configured to process the packet receiving, unpacking, receiving and sending of the voice frame in the IP transmission mode between the TC and the BTS;
  • the E1 based IP transport protocol processing unit 33' is configured to transmit IP data packets between the BTS and the BSC in the case where E1 is used as a physical transmission medium.
  • the system adopts a method of carrying the Lapd (D channel link access) protocol on the UDP, taking into consideration the implementation of the BSC and Real-time and reliability of BTS signaling transmission.
  • the Abis interface protocol layer is shown in the following table:
  • the system adopts M2UA mode to realize reliable transmission of SS7 transmission between TC and BSC over IP.
  • the IP-based SS7 transport protocol layer between the TC and the BSC is shown in the following table:
  • the system uses the existing TCSL protocol to implement the exchange between A and Atermux on the BSC to the TC. Link establishment and release control, allowing the system to continue to support traditional TDM mode on Atermux.
  • the IP-based switching link control protocol layer between the TC and the BSC is shown in the following table:
  • the system uses the existing TRAUP protocol to carry on the UDP, realizing the reliable transmission of the user plane based on IP between the TC and the BTS.
  • the IP-based user plane protocol layer between the TC and the BTS is shown in the following table:
  • the processing method of the call establishment in the TDM mode transmission according to the hybrid network base station system of the present invention includes the following steps:
  • the TC After receiving the call setup request from the MSC, the TC converts the seventh signaling based on the TDM mode into the seventh signaling based on the IP mode, and then forwards it to the BSC;
  • the BSC After receiving the call setup request from the TC, the BSC allocates radio resources, checks the call type, determines the BTS of the mobile terminal in the TDM mode, and then sends a TC exchange link establishment request to the TC, and establishes an exchange link within the BSC. And sending a wireless channel allocation request to the BTS;
  • the system activates the voice channel based on the TDM mode and establishes the uplink and downlink.
  • the processing method of the call establishment in the IP-based mode transmission of the hybrid network base station system of the present invention includes the following steps:
  • the TC After receiving the call setup request from the MSC, the TC converts the seventh signaling based on the TDM mode into the seventh signaling based on the IP mode, and then forwards it to the BSC;
  • the BSC After receiving the call setup request from the TC, the BSC allocates radio resources, checks the call type, determines the BTS of the mobile terminal in the IP mode, and then sends a radio channel allocation request to the BTS;
  • the BTS sends a voice channel connection establishment request to the TC;
  • the system activates the voice channel based on the IP mode and establishes the uplink and downlink.
  • the hybrid network base station system of the present invention implements a call handover method for a mobile terminal from a TDM mode to an IP mode BTS.
  • the MSC-triggered call handover process includes the following steps: During the process of the call transmitted in the TDM mode, the BSC receives the call handover request originating from the MSC. After receiving the call handover request from the MSC, the TC converts the No. 7 signaling based on the TDM mode to be based on Signal No. 7 transmitted in IP mode, and then forwarded to the BSC;
  • the BSC After receiving the external call handover request, the BSC allocates radio resources, checks the call type, determines that the mobile terminal is located in the TDM mode BTS, and then sends a radio channel allocation request to the IP mode BTS;
  • the IP mode BTS sends a voice channel connection establishment request to the TC;
  • the system activates the voice channel based on the IP mode, and establishes an uplink and a downlink;
  • the IP mode BTS sends a successful access indication to the BSC.
  • the BSC sends a TC exchange link release request to the TC, and sends a radio channel release request to the TDM mode BTS, and the internal exchange link is released.
  • the BSC internally triggered call switching process includes the following steps:
  • the BSC allocates the radio resource, checks the call type, determines that the mobile terminal is located in the TDM mode BTS, and then sends the call to the IP mode BTS.
  • Wireless channel allocation request ;
  • the IP mode BTS sends a voice channel connection establishment request to the TC;
  • the system activates the voice channel based on the IP mode, and establishes an uplink and a downlink;
  • the BTS sends a successful access indication to the BSC:
  • the BSC sends a TC exchange link release request to the TC, and sends a radio channel release request to the TDM mode BTS, and the internal exchange link is released.
  • the hybrid network base station system of the present invention implements a call handover method for a mobile terminal from an IP mode to a TDM mode BTS.
  • the call handover process triggered by the MSC includes the following steps:
  • the BSC receives a call handover request originating from the MSC.
  • the TC converts the seventh signaling based on the TDM mode to the seventh signaling based on the IP mode transmission, and then forwards it to the BSC;
  • the BSC After receiving the external call handover request, the BSC allocates radio resources, checks the call type, determines that the mobile terminal is located in the IP mode BTS, sends a TC exchange link setup request to the TC, and simultaneously establishes its internal exchange link, and then goes to the TDM mode BTS. Sending a wireless channel allocation request;
  • TDM mode BTS sends a voice channel connection establishment request to the TC
  • the system activates the voice channel based on the TDM mode, and establishes an uplink and a downlink;
  • the TDM mode BTS sends a successful access indication to the BSC;
  • the BSC sends a radio channel release request to the IP mode BTS, and the BTS sends a switch link release request to the TC.
  • the BSC allocates the radio resource, checks the call type, determines that the mobile terminal is located in the IP mode BTS, and sends a TC exchange link establishment request to the TC, and An internal switching link is established, and then a wireless channel allocation request is sent to the TDM mode BTS;
  • TDM mode BTS sends a voice channel connection establishment request to the TC
  • the voice channel is activated based on the TDM mode, and the uplink and downlink are established;
  • the TDM mode BTS sends a successful access indication to the BSC;
  • the BSC sends a radio channel release request to the IP mode BTS, and the BTS sends a switch link release request to the TC.
  • the processing method for the call release in the TDM mode transmission according to the hybrid network base station system of the present invention includes the following steps:
  • the TC After receiving the call release request from the MSC, the TC converts the seventh signaling based on the TDM mode into the seventh signaling based on the IP mode, and then forwards it to the BSC;
  • the BSC After receiving the call release request from the TC, the BSC sends a radio channel release request to the BTS in the TDM mode, and issues a TC exchange link release request to the TC, and simultaneously releases the exchange link in the BSC;
  • the voice channel transmitted by the system based on the TDM mode is released.
  • the processing method for the call release in the IP-based mode transmission of the hybrid network base station system of the present invention includes the following steps:
  • the TC After receiving the call release request from the MSC, the TC converts the seventh signaling based on the TDM mode to be based on
  • the BSC After receiving the call release request from the TC, the BSC sends a radio channel release request to the BTS of the IP mode;
  • the IP mode BTS sends a TC exchange link release request to the TC.
  • the voice channel transmitted by the system based on the IP mode is released.
  • the new network must be compatible with the previous TDM mode.
  • TC due to memory, CPU, etc.
  • IPoEl eliminates the need to make changes to the original E1 transport link. The operator can switch the mode of the BTS at any time (TDM -> IP, IP -> TDM).
  • the network supports both IP and traditional TDM. In this way, the operator is protected to the maximum extent of the original transmission resources.

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Description

混合组网中基站系统及其呼叫建立、 切换和释放处理方法 技术领域
本发明涉及同时支持 IP和传统 TDM的混合组网中的基站系统(BSS)及其呼叫建立、切换 和释放处理方法。 背景技术
参见图 1, 传统的 BSS (基站子系统) , 是由基站收发信台 (BTS) 、 基站控制器(BSC) 、 分组业务服务器 (MFS) 和 TC (码型变换器) 所组成, 通过 TC外接至移动交换中心 (MSC) , 通过 BTS无线连接移动终端 (MS) 。 该系统所有的传输都是基于 TDM (时分复用) 模式, 控 制平面和用户平面是没有具体区分的。 对于 BSC, 其外部接口涉及来自于 BTS的 ABIS接口、 来自于 TC的 Ater接口; 对于 TC, 其外部接口涉及与 MSC之间的 A接口。
相比较上述传统的 TDM网络而言, 目前 IP网己经非常成熟, 并且运行维护成本低。 因此, 各种传输网络向 IP网融合是电信通讯业的一个必然趋势。
然而, 在 TDM网络向传输网络向 IP网融合的过程中, 如何处理好以下问题, 如: 对不同 传输模式的 BTS管理; Call (呼叫) 在不同工作模式的 BTS之间 Handover (切换) ; 等等, 此 乃是业界以及本申请人一直致力研究的问题。 发明内容
本发明旨在提供一种同时支持 IP和传统 TDM的混合组网基站系统及其呼叫建立、 切换和 释放处理方法。
本发明之一, 一种基站控制器。 其连接在分别处于 TDM模式、 IP/TDM混合模式和 IP模 式下若干个 BTS和 TC之间, 其特征在于, 它包括基于基站控制器本体上的 IP/TDM模式呼叫链 路控制器、分别与该 IP/TDM模式呼叫链路控制器相连的第一信令接口控制器和第二信令接口控 制器、 以及 IP数据包转发单元, 其中: IP/TDM模式呼叫链路控制器, 用于处理在 IP传输或者 IP/TDM混合传输情况下的语音、 数据呼叫链路的建立、 切换以及释放的过程; 第一信令接口控 制器, 用于处理与所述 TC之间的信令传输, 控制 TC内部 A接口上的语音信道和 Ater接口上的 语音信道的交换链路的建立、 释放过程; 第二信令接口控制器, 用于处理与所述 BTS之间在 IP、 TDM或者 IP/TDM混合模式下的信令、语音的传输;控制在 IP模式或者 IP/TDM混合模式下 BTS 与 TC之间的语音信道的建立和释放; IP数据包转发单元, 用于负责转发 IP数据包。
在上述的基站控制器中, 还包括位于基站控制器本体的七号信令链路控制器内的 M2UA, 用于支持系统的全 IP传输, 并承担 BSC和 TC之间的 SS7的信令接驳。
本发明之二, 一种码型变换器。 其与上述的基站控制器配合使用, 其特征在于, 它包括基 于码型变换器本体上的信道变换单元和 IP语音 /数据帧接收 /发送单元,以及和所述信道变换单元 相连的七号信令 TDM/IP转换单元, 其中: 信道变换单元, 用于接受基站控制器第一信令接口控 制器的控制信号, 处理 A接口的各种信道与 Ater接口在 IP、 TDM或者 IP/TDM模式下的链路交 换; IP语音 /数据帧接收 /发送单元, 用于接受基站控制器第一信令接口控制器的控制信号, 处理 TC与 BTS之间在 IP传输模式下,语音帧的打包、解包接收与发送;七号信令 TDM/IP转换单元, 用于处理七号信令在 TDM传输模式与 IP传输模式之间的相互转换。
本发明之三, 一种支持 IP传输的基站收发信台。 它包括 BTS本体, 其特征在于, 它还包 括基于 BTS本体的 IP模式呼叫处理单元、 IP语音 /数据帧接收 /发送单元, 以及分别与所述 IP语 音 /数据帧接收 /发送单元和 IP模式呼叫处理单元相连的以太网物理接口,其中: IP模式呼叫处理 单元, 用于在 BSC第二信令接口控制器的控制下, 处理语音呼叫链路的建立、 切换和释放过程; IP语音 /数据帧接收 /发送单元, 用于处理 TC与本 BTS之间在 IP传输模式下进行语音帧的打包、 解包接收与发送。
本发明之四, 一种支持 IP传输的基站收发信台。 它包括 BTS本体, 其特征在于, 它还包 括基于 BTS本体的 IP模式呼叫处理单元、 IP语音 /数据帧接收 /发送单元, 以及分别与所述 IP语 音 /数据帧接收 /发送单元、 IP模式呼叫处理单元和 BTS本体上 E1物理接口相连的基于 E1的 IP 传输协议处理单元, IP模式呼叫处理单元, 用于在 BSC第二信令接口控制器的控制下, 处理语 音呼叫链路的建立、 切换和释放过程; IP语音 /数据帧接收 /发送单元, 用于处理 TC与本 BTS之 间在 IP传输模式下, 语音帧的打包、 解包接收与发送; 基于 E1的 IP传输协议处理单元, 用于 在 E1作为物理传输介质的情况下, 实现在 BTS和 BSC之间传输 IP数据包。
本发明之五, 一种混合组网的基站系统。 它上述的 BSC、 与该 BSC相连上述的 TC, 以及 若干个 BTS, 其中, 它还包括在 BSC、 TC和 BTS之间提供的一个带宽保证的 IP网, 且在 BSC 与 TC之间同时支持 IP 和传统 TDM方式的传输, 其中: BTS是支持 TDM传输的 BTS或支持 IP传输的 BTS。
在上述的混合组网的基站系统中,在 IP模式传输中, 所述的 TC与 BSC之间的交换链路控 制信令传输采用 TCSL协议方式, 以实现在混合组网中在 Ater接口上建立传统 TDM传输。 在上述的混合组网的基站系统中, 在 IP模式传输中, 所述的 BSC与 BTS之间信令传输采 用基于 UDP的 D信道链路接入协议方式。
在上述的混合组网的基站系统中,所述 TC与 BSC之间七号信令传输采用 M2UA协议方式。 在上述的混合组网的基站系统中, 在 IP模式传输中, 所述 TC与 BTC之间的用户平面传 输采用基于 UDP的 TRAUP协议方式。
本发明之六, 一种混合组网基站系统在基于 TDM模式传输中呼叫建立的处理方法。 该方 法包括下列步骤: 当 TC收到来自于 MSC的呼叫建立请求后,将基于 TDM模式传输的七号信令 转换成基于 IP模式传输的七号信令, 然后转发到 BSC; BSC收到来自于 TC的呼叫建立请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位于 TDM模式的 BTS, 然后向 TC发出 TC交换 链路建立请求,同时在 BSC内部建立交换链路,并向 BTS发送无线信道分配请求;系统基于 TDM 模式传输的语音信道激活, 建立了上行链路和下行链路。
本发明之七, 一种混合组网基站系统在基于 IP模式传输中呼叫建立的处理方法。该方法包 括下列步骤: 当 TC收到来自于 MSC的呼叫建立请求后, 将基于 TDM模式传输的七号信令转换 成基于 IP模式传输的七号信令, 然后转发到 BSC; BSC收到来自于 TC的呼叫建立请求后, 分 配无线资源, 检查呼叫类型, 确定移动终端位于 IP模式的 BTS, 然后向 BTS发送无线信道分配 请求; BTS向 TC发送语音信道连接建立请求; 系统基于 IP模式传输的语音信道激活, 建立了 上行链路和下行链路。
本发明之八,一种混合组网基站系统实现移动终端从 TDM模式到 IP模式 BTS的呼叫切换 方法。 该方法包括下列步骤: 一) 在基于 TDM模式传输的呼叫进行过程中, BSC会收到来源于 MSC或 BSC内部触发的呼叫切换请求: 对于是 MSC触发的呼叫切换请求, 则当 TC收到来自于 MSC的呼叫切换请求后,将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC, 进入步骤二) ; 对于 BSC内部触发的呼叫切换请求, 则直接进入步骤二) : 二) BSC 收到内部或外部呼叫切换请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位于 TDM模式 BTS, 然后向 IP模式 BTS发送无线信道分配请求; 三) IP模式 BTS向 TC发送语音 信道连接建立请求; 四) 系统基于 IP模式传输的语音信道激活, 建立了上行链路和下行链路; 五) IP模式 BTS向 BSC发送成功接入指示: 六) BSC向 TC发送 TC交换链路释放请求, 并向 TDM模式 BTS发送无线信道释放请求, 同时其内部交换链路进行释放。
本发明之九,一种混合组网基站系统实现移动终端从 IP模式到 TDM模式 BTS的呼叫切换 方法。 该方法包括下列步骤: 一) 在基于 IP 模式传输的呼叫进行过程中, BSC 会收到来源于 MSC或 BSC内部触发的呼叫切换请求: 对于是 MSC触发的呼叫切换请求, 则当 TC收到来自于 MSC的呼叫切换请求后,将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC, 进入步骤二) ; 对于 BSC内部触发的呼叫切换请求, 则直接进入步骤二) : 二) BSC 收到内部或外部呼叫切换请求后, 分配无线资源, 检查呼叫类型, 确定移动终端位于 IP模式 BTS, 向 TC发送 TC交换链路建立请求, 同时其内部交换链路建立, 然后向 TDM模式 BTS发送无线信道分配请求; 三) TDM模式 BTS向 TC发送语音信道连接建立请求; 四) 系统 基于 TDM模式传输的语音信道激活, 建立了上行链路和下行链路; 五) TDM模式 BTS向 BSC 发送成功接入指示; 六) BSC向 IP模式 BTS发送无线信道释放请求, BTS向 TC发送交换链路 释放请求。
本发明之十, 一种混合组网基站系统在基于 TDM模式传输中呼叫释放的处理方法。 该方 法包括下列步骤: 当 TC收到来自于 MSC的呼叫释放请求后, 将基于 TDM模式传输的七号信令 转换成基于 IP模式传输的七号信令, 然后转发到 BSC; BSC收到来自于 TC的呼叫释放请求后, 向 TDM模式的 BTS发出无线信道释放请求, 并向 TC发出 TC交换链路释放请求, 同时在 BSC 内部释放交换链路; 基于 TDM模式传输的语音信道得到释放。
本发明之十一,一种混合组网基站系统在基于 IP模式传输中呼叫释放的处理方法。该方法 包括下列步骤: 当 TC收到来自于 MSC的呼叫释放请求后, 将基于 TDM模式传输的七号信令转 换成基于 IP模式传输的七号信令, 然后转发到 BSC; BSC收到来自于 TC的呼叫释放请求后, 向 IP模式的 BTS发送无线信道释放请求; IP模式 BTS向 TC发送 TC交换链路释放请求; 基于 IP模式传输的语音信道得到释放。
采用了上述的技术解决方案, 本发明具有下列优点: 对 TDM 的兼容, 使得最大限度的保 护了运营商投资; 运营商可以平滑的从 TDM过渡到 IP, 降低了风险; 可以灵活的选取不同的物 理和数据链路传输设备承载 IP, 方便运营商组网; 语音服务中存在大量的静音帧, 在 IP模式下, 数据服务可以非常方便的共享这些带宽 (为了保证语音质量, 数据服务的优先级低于语音) 。 可 以非常方便的与 3G, WiMax (即全球微波接入互操作性) 多种不同的基于 IP的网络共存; 在一 个纯 IP模式的网络中, BSC可简化为一个信令服务器; IP模式中控制平面和用户平面完全独立, 简化开发和维护成本。 附图说明
图 1是传统 BSS的结构示意图; 图 2是本发明混合组网中基站系统的结构示意图;
图 3是本发明混合组网基站系统在基于 TDM模式传输中呼叫建立的处理流程图; 图 4是本发明混合组网基站系统在基于 IP模式传输中呼叫建立的处理流程图;
图 5 ( a)是本发明混合组网基站系统实现移动终端从 TDM模式到 IP模式 BTS的呼叫切换 ( MSC触发的呼叫切换) 的流程图;
图 5 ( b )是本发明混合组网基站系统实现移动终端从 TDM模式到 IP模式 BTS的呼叫切换 ( BSC内部触发的呼叫切换) 的流程图;
图 6 ( a)是本发明混合组网基站系统实现移动终端从 IP模式到 TDM模式 BTS的呼叫切换 ( MSC触发的呼叫切换) 的流程图;
图 6 ( b)是本发明混合组网基站系统实现移动终端从 IP模式到 TDM模式 BTS的呼叫切换 ( BSC内部触发的呼叫切换) 的流程图;
图 Ί是本发明混合组网基站系统在基于 TDM模式传输中呼叫释放的处理流程图; 图 8是本发明混合组网基站系统在基于 IP模式传输中呼叫释放的处理流程图。
图 9是本发明基站控制器的结构示意图;
图 10是本发明码型变换器的结构示意图;
图 11 ( a) 是本发明基站收发信台结构之一的示意图;
图 11 ( b ) 是本发明基站收发信台结构之二的示意图。 具体实施方式
如图 2所示, 本发明, 即一种混合组网的基站系统, 包括 BSC、 与该 BSC相连 TC, 以及 若干个 BTS, 其中, 它还包括在 BSC、 TC和 BTS之间提供的一个带宽保证的 IP网, 且在 BSC 与 TC之间同时支持 IP 和传统的 TDM方式传输, BTS可以是支持 TDM传输的 BTS, 或支持 IP 传输的 BTS。 下面就在 BSC、 TC和 BTS分别进行详细介绍。
一, 基站控制器 (BSC )
如图 9所示, 基站控制器(BSC )连接在分别处于 TDM模式、 IP/TDM混合模式和 IP模式 下若干个 BTS和 TC之间, 包括基于基站控制器本体 1上的 IP/TDM模式呼叫链路控制器 12、 分别与该 IP/TDM模式呼叫链路控制器 12相连的第一信令接口控制器 13和第二信令接口控制器 11、 以及 IP数据包转发单元 14, 其中:
IP/TDM模式呼叫链路控制器 12,用于处理在 IP传输或者 IP/TDM混合传输情况下的语音、 数据呼叫链路的建立、 切换以及释放的过程;
第一信令接口控制器 13, 用于处理与所述 TC之间的信令传输, 控制 TC内部 A接口上的 语音信道和 Ater接口上的语音信道的交换链路的建立、 释放过程;
第二信令接口控制器 12, 用于处理与所述 BTS之间在 IP、 TDM或者 IP/TDM混合模式下 的信令、 语音的传输; 控制在 IP模式或者 IP/TDM混合模式下 BTS与 TC之间的语音信道的建 立和释放;
IP数据包转发单元 14, 用于负责转发 IP数据包。
另外, 基站控制器还可包括位于基站控制器本体 1 的七号信令链路控制器内的 M2UA ( MTP2用户自适应层) 15, 用于支持系统的全 IP传输, 并承担 BSC和 TC之间的 SS7的信令 接驳。
二、 码型变换器 (TC)
参见图 10, 码型变换器(TC )包括基于码型变换器本体 2上的信道变换单元 22和 IP语音 /数据帧接收 /发送单元 23, 以及和所述信道变换单元 22相连的七号信令 TDM/IP转换单元 21, 其中:
信道变换单元 22, 用于接受基站控制器第一信令接口控制器 13的控制信号, 处理 A接口 的各种信道与 Ater接口在 IP、 TDM或者 IP/TDM模式下的链路交换;
IP语音 /数据帧接收 /发送单元 23,用于接受基站控制器第一信令接口控制器 13的控制信号, 处理 TC与 BTS之间在 IP传输模式下, 语音帧的打包、 解包接收与发送;
七号信令 TDM/IP转换单元 21 , 用于处理七号信令在 TDM传输模式与 IP传输模式之间的 相互转换。
三、 支持 IP传输的基站收发信台 (BTS)
如图 11 ( a) 所示, 一种支持 IP传输的 BTS, 包括 BTS本体 3、 基于 BTS本体 3的 IP模 式呼叫处理单元 31、 IP语音 /数据帧接收 /发送单元 32, 以及分别与所述 IP语音 /数据帧接收 /发 送单元 32和 IP模式呼叫处理单元 31相连的以太网物理接口 33 , 其中:
IP模式呼叫处理单元 31, 用于在 BSC第二信令接口控制器 11的控制下, 处理语音呼叫链 路的建立、 切换和释放过程;
IP语音 /数据帧接收 /发送单元 32,用于处理 TC与本 BTS之间在 IP传输模式下进行语音帧 的打包、 解包接收与发送。
如图 11 ( b) 所示, 一种支持 IP传输的基站收发信台, 包括 BTS本体 3' , 基于 BTS本体 3'的 IP模式呼叫处理单元 3Γ、 IP语音 /数据帧接收 /发送单元 32', 以及分别与所述 IP语音 /数据 帧接收 /发送单元 32'、 IP模式呼叫处理单元 31 '和 BTS本体 3'上 E1物理接口 34'相连的基于 E1 的 IP传输协议处理单元 33',
IP模式呼叫处理单元 3Γ , 用于在 BSC第二信令接口控制器 11 的控制下, 处理语音呼叫 链路的建立、 切换和释放过程;
IP语音 /数据帧接收 /发送单元 32', 用于处理 TC与本 BTS之间在 IP传输模式下, 语音帧 的打包、 解包接收与发送;
基于 E1的 IP传输协议处理单元 33' , 用于在 E1作为物理传输介质的情况下, 实现在 BTS 和 BSC之间传输 IP数据包。
在上述的混合组网的基站系统中, 为了解决 Abis接口基于 IP网络的信令传输的问题, 系 统采用将 Lapd ( D信道链路接入) 协议承载在 UDP上的方法, 兼顾实现了 BSC和 BTS信令传 输的实时性和可靠性。 Abis 接口协议层如下表所示:
Lapd
UDP IP
为了解决 TC和 BSC之间基于 IP的七号信令传输问题, 系统采用 M2UA方式, 实现了 TC 和 BSC之间的七号信令传输在 IP上的可靠传输。 TC和 BSC之间基于 IP的七号信令传输协议层 如下表所示:
M2UA
SCTP
Π»
为了实现在混合组网中在 Atermux( BSC与 TC之间的连口)上建立传统 TDM传输的问题, 系统采用已有的 TCSL协议, 实现了在 BSC对 TC上从 A与 Atermux之间的交换链路建立和释 放的控制, 使系统继续在 Atermux上支持传统 TDM方式。 TC和 BSC之间基于 IP的交换链路控 制协议层如下表所示:
Figure imgf000010_0001
为了解决 TC和 BTC之间基于 IP的用户平面传输问题, 系统采用已有的 TRAUP协议承载 在 UDP之上, 实现了 TC和 BTS之间的用户平面基于 IP的可靠传输。 TC和 BTS之间基于 IP 的用户平面协议层如下表所示:
TRAUP UDP IP
如图 3所示, 本发明混合组网基站系统在基于 TDM模式传输中呼叫建立的处理方法, 包 括下列步骤:
当 TC收到来自于 MSC的呼叫建立请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫建立请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位 于 TDM模式的 BTS, 然后向 TC发出 TC交换链路建立请求, 同时在 BSC内部建立交换链路, 并向 BTS发送无线信道分配请求;
系统基于 TDM模式传输的语音信道激活, 建立了上行链路和下行链路。
如图 4所示, 本发明混合组网基站系统在基于 IP模式传输中呼叫建立的处理方法, 包括下 列步骤:
当 TC收到来自于 MSC的呼叫建立请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫建立请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位 于 IP模式的 BTS, 然后向 BTS发送无线信道分配请求;
BTS向 TC发送语音信道连接建立请求;
系统基于 IP模式传输的语音信道激活, 建立了上行链路和下行链路。
如图 5 ( a) 所示, 本发明混合组网基站系统实现移动终端从 TDM模式到 IP模式 BTS的 呼叫切换方法, 对于 MSC触发的呼叫切换过程, 包括下列步骤: 在基于 TDM模式传输的呼叫进行过程中, BSC会收到来源于 MSC触发的呼叫切换请求, 当 TC收到来自于 MSC的呼叫切换请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模 式传输的七号信令, 然后转发到 BSC;
BSC收到外部的呼叫切换请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位于 TDM 模式 BTS, 然后向 IP模式 BTS发送无线信道分配请求;
IP模式 BTS向 TC发送语音信道连接建立请求;
系统基于 IP模式传输的语音信道激活, 建立了上行链路和下行链路;
IP模式 BTS向 BSC发送成功接入指示;
BSC向 TC发送 TC交换链路释放请求, 并向 TDM模式 BTS发送无线信道释放请求, 同 时其内部交换链路进行释放。
参见图 5 (b) , BSC内部触发的呼叫切换过程, 包括下列步骤:
在基于 TDM模式传输的呼叫进行过程中, BSC在收到来源于 BSC内部触发的呼叫切换请 求后, BSC分配无线资源, 检査呼叫类型, 确定移动终端位于 TDM模式 BTS, 然后向 IP模式 BTS发送无线信道分配请求;
IP模式 BTS向 TC发送语音信道连接建立请求;
系统基于 IP模式传输的语音信道激活, 建立了上行链路和下行链路;
IP模式 BTS向 BSC发送成功接入指示:
BSC向 TC发送 TC交换链路释放请求, 并向 TDM模式 BTS发送无线信道释放请求, 同 时其内部交换链路进行释放。
如图 6 ( a) 所示, 本发明混合组网基站系统实现移动终端从 IP模式到 TDM模式 BTS的 呼叫切换方法, 对于 MSC触发的呼叫切换过程, 包括下列步骤:
在基于 IP模式传输的呼叫进行过程中, BSC会收到来源于 MSC触发的呼叫切换请求。 当 TC收到来自于 MSC的呼叫切换请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式 传输的七号信令, 然后转发到 BSC;
BSC收到来外部的呼叫切换请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位于 IP 模式 BTS, 向 TC发送 TC交换链路建立请求, 同时其内部交换链路建立,然后向 TDM模式 BTS 发送无线信道分配请求;
TDM模式 BTS向 TC发送语音信道连接建立请求;
系统基于 TDM模式传输的语音信道激活, 建立了上行链路和下行链路; TDM模式 BTS向 BSC发送成功接入指示;
BSC向 IP模式 BTS发送无线信道释放请求, BTS向 TC发送交换链路释放请求。
参见图 6 (b) , 对于 BSC内部触发的呼叫切换过程, 包括下列步骤:
在基于 IP模式传输的呼叫进行过程中, 当 BSC内部触发呼叫切换请求后, BSC分配无线 资源, 检査呼叫类型, 确定移动终端位于 IP模式 BTS, 向 TC发送 TC交换链路建立请求, 同时 其内部交换链路建立, 然后向 TDM模式 BTS发送无线信道分配请求;
TDM模式 BTS向 TC发送语音信道连接建立请求;
基于 TDM模式传输的语音信道激活, 建立了上行链路和下行链路;
TDM模式 BTS向 BSC发送成功接入指示;
BSC向 IP模式 BTS发送无线信道释放请求, BTS向 TC发送交换链路释放请求。
如图 7所示, 本发明混合组网基站系统在基于 TDM模式传输中呼叫释放的处理方法, 包 括下列步骤:
当 TC收到来自于 MSC的呼叫释放请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫释放请求后, 向 TDM模式的 BTS发出无线信道释放请求, 并 向 TC发出 TC交换链路释放请求, 同时在 BSC内部释放交换链路;
系统基于 TDM模式传输的语音信道得到释放。
如图 8所示, 本发明混合组网基站系统在基于 IP模式传输中呼叫释放的处理方法, 包括下 列步骤:
当 TC收到来自于 MSC的呼叫释放请求后, 将基于 TDM模式传输的七号信令转换成基于
IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫释放请求后, 向 IP模式的 BTS发送无线信道释放请求;
IP模式 BTS向 TC发送 TC交换链路释放请求;
系统基于 IP模式传输的语音信道得到释放。
综上所述, 本发明的基本思想包括:
1 - 为了保护运营商的投资, 对于已有网络必须做到影响最小。 由于 BSS系统中, 主要的 设备和传输资源集中在 Abis。 因此该方案主要考虑减少对 Abis的影响。
2. 新的网络必须兼容以前的 TDM模式。 对于已经工作在 TDM模式, 而且无法升级到 IP 模式的 BTS, TC (由于内存, CPU等的限制) 必须依然能够支持。 3. 对需要升级到 IP模式的 BTS, 利用 IPoEl使得无需对原有的 E1传输链路作改动。 运营 商随时可以对 BTS的模式切换 (TDM -> IP, IP -> TDM)。
4. 对于新的 BTS, 提供新的传输方式 (以太网, xDSL... ) 接口, 使得 IP优势得到充分体 现。
5. 对于 BSC与 TC之间的连接, 网络同时支持 IP 和传统的 TDM方式。 这样运营商对于 原有传输资源得到了最大限度的保护。
6.在 BSC与 TC之间的连接, 由于它己经靠近核心网,改造费用相对较低,原则上可以认为在 BSC 与 TC之间可以提供一个带宽保证的 IP网。同时,如果运营商希望利用原有的传输网络和 TC资源, Traffic 还可以继续使用 TDM模式承载在 El传输上。 但是由于信令 (SS7) 都会使用 IP模式, 因此新的 TC必 须提供一个到 IP网的接口。
需要说明的是: 以上仅用以说明而非限制本发明的技术方案, 尽管参照上述实施例对本发明 进行了详细说明, 本领域的普通技术人员应当理解: 依然可以对本发明进行修改或者等同替换, 而不脱离本发明的精神和范围的任何修改或局部替换, 其均应涵盖在本发明的权利要求范围当 中。

Claims

权 利 要 求
1.一种基站控制器,连接在分别处于 TDM模式、 IP/TDM混合模式和 IP模式下若干个 BTS 和 TC之间, 其特征在于, 它包括基于基站控制器本体上的 IP/TDM模式呼叫链路控制器、 分别 与该 IP/TDM模式呼叫链路控制器相连的第一信令接口控制器和第二信令接口控制器、 以及 IP 数据包转发单元, 其中:
IP/TDM模式呼叫链路控制器, 用于处理在 IP传输或者 IP/TDM混合传输情况下的语音、 数据呼叫链路的建立、 切换以及释放的过程;
第一信令接口控制器, 用于处理与所述 TC之间的信令传输, 控制 TC内部 A接口上的语 音信道和 Ater接口上的语音信道的交换链路的建立、 释放过程;
第二信令接口控制器, 用于处理与所述 BTS之间在 IP、 TDM或者 IP/TDM混合模式下的 信令、 语音的传输; 控制在 IP模式或者 IP/TDM混合模式下 BTS与 TC之间的语音信道的建立 和释放;
IP数据包转发单元, 用于负责转发 IP数据包。
2. 根据权利要求 1所述的基站控制器, 其特征在于: 它还包括位于基站控制器本体的七号 信令链路控制器内的 M2UA, 用于支持系统的全 IP传输, 并承担 BSC和 TC之间的 SS7的信令 接驳。
3. 一种码型变换器, 其与权利要求 1所述的基站控制器配合使用, 其特征在于, 它包括基 于码型变换器本体上的信道变换单元和 IP语音 /数据帧接收 /发送单元,以及和所述信道变换单元 相连的七号信令 TDM/IP转换单元, 其中:
信道变换单元, 用于接受基站控制器第一信令接口控制器的控制信号, 处理 A接口的各种 信道与 Ater接口在 IP、 TDM或者 IP/TDM模式下的链路交换;
IP 语音 /数据帧接收 /发送单元, 用于接受基站控制器第一信令接口控制器的控制信号, 处 理 TC与 BTS之间在 IP传输模式下, 语音帧的打包、 解包接收与发送;
七号信令 TDM/IP转换单元, 用于处理七号信令在 TDM传输模式与 IP传输模式之间的相 互转换。
4. 一种支持 IP传输的基站收发信台, 包括 BTS本体, 其特征在于, 它还包括基于 BTS 本体的 IP模式呼叫处理单元、 IP语音 /数据帧接收 /发送单元, 以及分别与所述 IP语音 /数据帧接 收 /发送单元和 IP模式呼叫处理单元相连的以太网物理接口, 其中: IP模式呼叫处理单元, 用于在 BSC第二信令接口控制器的控制下, 处理语音呼叫链路的建 立、 切换和释放过程;
IP语音 /数据帧接收 /发送单元, 用于处理 TC与本 BTS之间在 IP传输模式下进行语音帧的 打包、 解包接收与发送。
5. 一种支持 IP传输的基站收发信台, 包括 BTS本体, 其特征在于, 它还包括基于 BTS 本体的 IP模式呼叫处理单元、 IP语音 /数据帧接收 /发送单元, 以及分别与所述 IP语音 /数据帧接 收 /发送单元、 IP模式呼叫处理单元和 BTS本体上 E1物理接口相连的基于 E1的 IP传输协议处 理单元,
IP模式呼叫处理单元, 用于在 BSC第二信令接口控制器的控制下, 处理语音呼叫链路的建 立、 切换和释放过程;
IP语音 /数据帧接收 /发送单元, 用于处理 TC与本 BTS之间在 IP传输模式下, 语音帧的打 包、 解包接收与发送;
基于 E1的 IP传输协议处理单元, 用于在 E1作为物理传输介质的情况下, 实现在 BTS和 BSC之间传输 IP数据包。 '
6. 一种混合组网的基站系统, 其特征在于: 它包括如权利要求 1所述的 BSC、 与该 BSC 相连的如权利要求 3所述的 TC, 以及若干个 BTS, 其中, 它还包括在 BSC、 TC和 BTS之间提 供的一个带宽保证的 IP网, 且在 BSC与 TC之间同时支持 IP 和传统 TDM方式的传输, 其中: BTS是支持 TDM传输的 BTS或支持 IP传输的 BTS。
7. 根据权利要求 6所述的混合组网的基站系统, 其特征在于: 在 IP模式传输中, 所述的 TC与 BSC之间的交换链路控制信令传输采用 TCSL协议方式,以实现在混合组网中在 Ater接口 上建立传统 TDM传输。
8. 根据权利要求 7所述的混合组网的基站系统, 其特征在于: 在 IP模式传输中, 所述的 BSC与 BTS之间信令传输采用基于 UDP的 D信道链路接入协议方式。
9. 根据权利要求 7所述的混合组网的基站系统, 其特征在于: 所述 TC与 BSC之间七号 信令传输采用 M2UA协议方式。
10. 根据权利要求 7所述的混合组网的基站系统, 其特征在于: 在 IP模式传输中, 所述 TC与 BTC之间的用户平面传输采用基于 UDP的 TRAUP协议方式。
11. 一种混合组网基站系统在基于 TDM模式传输中呼叫建立的处理方法, 包括下列步骤: 当 TC收到来自于 MSC的呼叫建立请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫建立请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位 于 TDM模式的 BTS, 然后向 TC发出 TC交换链路建立请求, 同时在 BSC内部建立交换链路, 并向 BTS发送无线信道分配请求;
系统基于 TDM模式传输的语音信道激活, 建立了上行链路和下行链路。
12. 一种混合组网基站系统在基于 IP模式传输中呼叫建立的处理方法, 包括下列步骤: 当 TC收到来自于 MSC的呼叫建立请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫建立请求后, 分配无线资源, 检査呼叫类型, 确定移动终端位 于 IP模式的 BTS, 然后向 BTS发送无线信道分配请求;
BTS向 TC发送语音信道连接建立请求;
系统基于 IP模式传输的语音信道激活, 建立了上行链路和下行链路。
13. 一种混合组网基站系统实现移动终端从 TDM模式到 IP模式 BTS的呼叫切换方法, 包 括下列步骤:
一) 在基于 TDM模式传输的呼叫进行过程中, BSC会收到来源于 MSC或 BSC内部触发 的呼叫切换请求:
对于是 MSC触发的呼叫切换请求, 则当 TC收到来自于 MSC的呼叫切换请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令,然后转发到 BSC,进入步骤二); 对于 BSC内部触发的呼叫切换请求, 则直接进入步骤二) :
二) BSC收到内部或外部呼叫切换请求后, 分配无线资源, 检查呼叫类型, 确定移动终端 位于 TDM模式 BTS, 然后向 IP模式 BTS发送无线信道分配请求;
三) IP模式 BTS向 TC发送语音信道连接建立请求;
四) 系统基于 IP模式传输的语音信道激活, 建立了上行链路和下行链路;
五) IP模式 BTS向 BSC发送成功接入指示;
六) BSC向 TC发送 TC交换链路释放请求, 并向 TDM模式 BTS发送无线信道释放请求, 同时其内部交换链路进行释放。
14. 一种混合组网基站系统实现移动终端从 IP模式到 TDM模式 BTS的呼叫切换方法, 包 括下列步骤:
一)在基于 IP模式传输的呼叫进行过程中, BSC会收到来源于 MSC或 BSC内部触发的呼 叫切换请求:
对于是 MSC触发的呼叫切换请求, 则当 TC收到来自于 MSC的呼叫切换请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令,然后转发到 BSC,进入步骤二); 对于 BSC内部触发的呼叫切换请求, 则直接进入步骤二) :
二) BSC收到内部或外部呼叫切换请求后, 分配无线资源, 检査呼叫类型, 确定移动终端 位于 IP模式 BTS, 向 TC发送 TC交换链路建立请求, 同时其内部交换链路建立, 然后向 TDM 模式 BTS发送无线信道分配请求;
三) TDM模式 BTS向 TC发送语音信道连接建立请求;
四) 系统基于 TDM模式传输的语音信道激活, 建立了上行链路和下行链路;
五) TDM模式 BTS向 BSC发送成功接入指示;
六) BSC向 IP模式 BTS发送无线信道释放请求, BTS向 TC发送交换链路释放请求。
15. 一种混合组网基站系统在基于 TDM模式传输中呼叫释放的处理方法, 包括下列步骤: 当 TC收到来自于 MSC的呼叫释放请求后, 将基于 TDM模式传输的七号信令转换成基于
IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫释放请求后, 向 TDM模式的 BTS发出无线信道释放请求, 并 向 TC发出 TC交换链路释放请求, 同时在 BSC内部释放交换链路;
基于 TDM模式传输的语音信道得到释放。
16. 一种混合组网基站系统在基于 IP模式传输中呼叫释放的处理方法, 包括下列步骤: 当 TC收到来自于 MSC的呼叫释放请求后, 将基于 TDM模式传输的七号信令转换成基于 IP模式传输的七号信令, 然后转发到 BSC;
BSC收到来自于 TC的呼叫释放请求后, 向 IP模式的 BTS发送无线信道释放请求;
IP模式 BTS向 TC发送 TC交换链路释放请求;
基于 IP模式传输的语音信道得到释放。
PCT/CN2007/001762 2006-06-19 2007-06-01 Base station system and method for call setting up, handing over and relaeasing in hybrid network WO2008000138A1 (en)

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CN101094160A (zh) 2007-12-26
US20090305703A1 (en) 2009-12-10
CN100571206C (zh) 2009-12-16
US8644257B2 (en) 2014-02-04
KR101336684B1 (ko) 2013-12-04
KR20090019815A (ko) 2009-02-25
EP2037692A4 (en) 2013-03-06
EP2037692A1 (en) 2009-03-18
US20120230294A1 (en) 2012-09-13
US8189534B2 (en) 2012-05-29

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