1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000677.2001(R2011) BICC Bearer Control Tunneling Protocol ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment an
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11、edition of the standards and other references listed below. ITU-T Recommendation Q.1990, Bearer Independent Call Control Protocol.2T1.673-2002 - Bearer Independent Call Control (BICC) CS 1+.3T1.676-2002 - BICC IP Bearer Control Protocol (IPBCP).3_ 1A “|” indicates a change from ITU-T Recommendation
12、Q.1990. Strictly editorial changes are not shown. 2This document is available from the International Telecommunications Union. 3This document is available from the Alliance for Telecommunications Industry Solutions, 1200 G Street N.W., Suite 500, Washington, DC 20005. ATIS-1000677.2001 2 3 Terms and
13、 Definitions For the purpose of this Standard, the following definitions apply: 3.1 Tunneling PDU Generating Entity: The entity that populates and transmits the tunneled PDUs. 3.2 Tunneling PDU Receiving Entity: The entity that receives and interprets the tunneled PDUs. 4 Abbreviations This Standard
14、 uses the following abbreviations: APM Application Transport Mechanism BCP Bearer Control Protocol BCTP Bearer Control Tunneling Protocol BCU Bearer Control Unit BICC Bearer Independent Call Control BIWF Bearer Interworking Function BVEI BCTP Version Error Indicator CCU Call Control Unit CSF Call Se
15、rving Function TPEI Tunneled Protocol Error Indicator IPBCP IP Bearer Control Protocol MMSF Media Mapping/Switching Function PCI Protocol Control Information PDU Protocol Data Unit 5 Overview This Standard assumes a reliable, sequenced, point-to-point signaling transport service between peer Tunneli
16、ng PDU Generating and Receiving Entities. This Standard supports the tunneling of BCP over the following protocol. BICC protocol - BICC tunneling makes use of the BICC APM Mechanism and BICC call control, as defined in T1.673-2002.3The operation of the tunneling mechanism is illustrated in Figure 1.
17、 ATIS-1000677.2001 3 BIWFCCUCSFBCFMMSFBCUDistr.Tunneling PDUGenerating It sends this PDU back to the Tunneling PDU Generating Entity that sent it; and It informs the control logic in the BIWF (see Note). If the Tunneling PDU Receiving Entity receives a tunneled PDU with a known value of the BCTP Ver
18、sion Indicator, but an unknown value of the Tunneled Protocol Indicator: It generates a two-octet PDU back into the tunnel only containing the BCTP Indicator field. The Tunneled Protocol Error Indicator is set at the “Protocol Error Indication, bearer control protocol not supported“ value. The Tunne
19、led Protocol Indicator is set to the same value as the Tunneled Protocol Indicator value received; It sends this PDU back to the Tunneling PDU Generating Entity that sent it; and It informs the control logic in the BIWF (note). If the Tunneling PDU Receiving Entity receives a tunneled PDU with the T
20、unneled Protocol Error Indicator value “Protocol Error Indication, Bearer Control Protocol not supported,“ and/or if the Tunneling PDU Receiving Entity receives a tunneled PDU with the BCTP Version Error Indicator value “Version Error Indication, BCTP version not supported“: It informs the control l
21、ogic in the BIWF (Note). NOTE - It is the responsibility of the control logic in the BIWF to take appropriate release actions. However, the control logic in the BIWF is out of the scope of this Standard. Procedures for version negotiation and protocol negotiation are for further study. ATIS-1000677.
22、2001 6 7.3 Policing of Maximum Length Tunneled PDUs The tunneling PDU generating entity shall police the maximum length of the tunneled PDUs in order to ensure that the maximum data transfer capabilities of the tunneling mechanisms in BICC are not exceeded. These maximum transfer capabilities depend on the capabilities of the underlying signaling transport network supporting the BICC interface.
