US20070211683A1 - System and method for reducing information communicated between universal mobile telecommunication system multimedia capable units - Google Patents
System and method for reducing information communicated between universal mobile telecommunication system multimedia capable units Download PDFInfo
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- US20070211683A1 US20070211683A1 US11/801,102 US80110207A US2007211683A1 US 20070211683 A1 US20070211683 A1 US 20070211683A1 US 80110207 A US80110207 A US 80110207A US 2007211683 A1 US2007211683 A1 US 2007211683A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/102—Gateways
- H04L65/1023—Media gateways
- H04L65/103—Media gateways in the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/102—Gateways
- H04L65/1033—Signalling gateways
- H04L65/104—Signalling gateways in the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
- H04L65/1104—Session initiation protocol [SIP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
- H04L65/765—Media network packet handling intermediate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/08—Upper layer protocols
- H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/18—Service support devices; Network management devices
- H04W88/182—Network node acting on behalf of an other network entity, e.g. proxy
Definitions
- the present invention relates to wireless telecommunications. More specifically, the present invention relates to a technique for reducing unnecessary consumption of the air link resources and network capacity by reducing the size of transmitted messages.
- the current third generation partnership project (3GPP) and internet engineering task force (IETF) session description protocol (SDP) protocol (RFC 2327) mandate that the proxy call state control functions (P-CSCF), the serving call state control functions (S-CSCFs) and the terminating end user (User Equipment UE) to examine the media contents of the session description protocol (SDP) text in the session initialization protocol (SIP) message.
- 3GPP third generation partnership project
- IETF internet engineering task force
- FIG. 1 shows a simplified session initiation system.
- a user UE-A 20
- UE-A 20 is shown as “roaming” in network A 22 , not its home network.
- UE-A 20 sends a SIP invite message 44 1 to UE-B 40 via network A 22 .
- the UE-A SIP invite 44 1 indicates all the media types that it can support.
- the SIP invite 44 1 has a header, global information, and a list of the supported media types (media 1 to media 6 ).
- the supported media types include information for each media, such as the CODEC type, stream format, stream bit rate, and communication port number. Under the proposed system, there are no limits on the number of media types that a UE can include in the SIP invite message.
- FIG. 2 is an example of a SIP invite message.
- the SIP invite message has a header, global information and supported media types for UE-A 20 for potential use in the proposed media session.
- the header includes various overhead information, such as the origin and destination of the SIP invite.
- the global information includes information common to all the proposed media types, such as the destination address and the proposed session identification (ID) number.
- the supported media types are listed. In this example, four media types are listed, two video (video media 1 and video media 2 ) and two audio (audio media 3 and audio media 4 ).
- Each proposed media session includes information regarding the media session, such as the port number, real time protocol (RTP) payload type and RTP format and clock rate port.
- RTP real time protocol
- UE-A 20 sends the SIP invite to its current network, such as network A 22 , in which it is currently located.
- UE-A may be “roaming,” as shown in FIG. 1 and communicating with a network, network A 22 , or it may be in its home network, network B 30 .
- the SIP invite 44 1 is examined by a P-CSCF 24 of its current network, such as network A 22 , for routing to its destination, UE-B 40 via UE-A's home network, network B 30 .
- the P-CSCF 24 examines the session description protocol (SDP) multimedia contents of the SIP invite 44 1 for validation and authorization.
- SDP session description protocol
- network A 24 does not support any part of the media information, (such as the CODESs, bit rate or the type), it flags that portion of the media information by setting the port number to “0” and leaving the other contents of the media information untouched, as shown for media 5 and 6 for SIP invite 44 2 .
- FIG. 3 is an example of such a flagged SIP invite 44 .
- the P-CSCF cannot support video media 1 .
- the port number is set to “0” so that UE-B 40 realized that video media 1 cannot be selected for the media session.
- the network A P-CSCF 24 forwards the modified SIP invite 44 2 to the network B S-CSCF 26 for further handling, routing and validation. If UE-A 20 is in the home network, both the P-CSCF and S-CSCF function are performed by the home network 30 .
- the network B S-CSCF 26 examines the SIP invite 44 2 including the media information. Media types not supported by UE-A's service license agreement (SLA) are flagged. If UE-A 20 is in its home network, the flagging process is only performed by the S-CSCF 26 , not by the P-CSCF 24 .
- the S-CSCF 26 forwards the SIP invite 44 3 to UE-B's home network, network C 36 , using intorgating-CSCFS (I-CSCF) 28 , 32 .
- I-CSCF intorgating-CSCFS
- the network C S-CSCF 34 similarly examines the SIP invite 44 3 for media types not available under UE-B's SLA. The not available media types are flagged, as illustrated for media 1 and of SIP 44 4 . If UE-B 40 is not in its home network, as shown, the SIP invite 44 4 is forwarded to the P-CSCF 38 of the network, network D 42 , where UE-B 40 is currently located, or “roaming.” If UE-B 40 is in its home network, the SIP invite 44 4 is forwarded to the P-CSCF 38 of the home network.
- the P-CSCF 38 flags the media types not supported by the network, network D. No additional flagged media types are shown in SIP invite 44 5 . If the UE-B is in its home network, the flagging is only performed by the S-CSCF 34 .
- the P-CSCF 38 sends the SIP invite 44 5 to UE-B 40 .
- UE-B 40 examines the media information of the SIP invite 44 5 and determines whether it is capable of using any of the unflagged media types. If it can not use any of the unflagged media types or there are not any remaining unflagged media types, UE-B 40 sends UE-A 20 a session description protocol message (SPM) 46 with all media types flagged. If it can use the unflagged media types, UE-B 40 selects one or more of the available media types for the session. The selected media types unflagged and the flagged media types are returned to UE-A 20 in the SPM 44 .
- SPM session description protocol message
- the SIP invite message 44 is large and, accordingly, consumes valuable air interface and wireless network resources. This resource consumption either degrades the network performance or reduces the maximum number of users serviced by the networks.
- the present invention reduces the size of the SIP message by eliminating or deleting unsupported and/or unauthorized media types in the SIP along the signaling route from the originating end user to the terminating one and back.
- the present invention restricts the media information carried within the SIP message to information that is allowed by the network and authorized for the users at both ends.
- FIG. 1 is an example of an overall system diagram for media session initiation.
- FIG. 2 is an example of a Session Initialization Protocol (SIP) message.
- SIP Session Initialization Protocol
- FIG. 3 is an example of a SIP message with a flagged media type.
- FIGS. 4 a and 4 b are signaling diagrams.
- FIG. 5 is an example of an overall system diagram.
- FIG. 6 is an example of a SIP message.
- FIG. 7 is an example of a SIP message with removed media information.
- FIGS. 4 a and 4 b is a signaling diagram of the present invention.
- FIG. 5 illustrates an example of the components of the media session initiation.
- UE-A 46 desires to initiate a media session with UE-B 68 .
- UE-A 46 and UE-B 48 may be any wireless communication device, such as a mobile phone, personal computer (PC) or personal digital assistant (PDA).
- UE-A 46 in the system of FIG. 5 is shown as “roaming” in network A 50 .
- network B 58 is the “home” network for UE-A 46 .
- UE-A 46 may be in its home network.
- UE-A 46 determines the CODECS available for the media types for the proposed session, ( 74 ).
- a SIP invite 52 1 such as shown in FIG. 2 , is composed using this information.
- UE-A 46 sends the SIP invite message 52 1 intended for UE-B 58 via network A is P-CSCF 48 .
- UE-B 68 is shown as “roaming” in network D 70 .
- UE-B 68 may be in its home network, network C 64 .
- the SIP invite 52 1 includes all the media types that UE-A 46 can support and invites UE-B 68 to choose the type(s) that it can support.
- the media information includes the CODEC types, stream format, stream bit rate, and communication port number, among other media attributes.
- CODEC types the number of media types that a UE can include in the SIP invite message 52 1 .
- end user such as UE-B 68 to include unauthorized unsupported media types.
- the P-CSCF 48 routes the SIP invite 52 1 to the end user (UE-B 68 ).
- the P-CSCF function 48 initiates examination of the SIP invite message 52 1 for routing and for validation and authorization of the SDP multimedia contents. If network A 50 does not support any part of the media information (such as the CODECS, the bit rate or the media type), P-CSCF 48 deletes the media entry from the SDP message leaving only the supported media entries, ( 76 ), as shown as SIP invite 52 2 . In the example SIP invite 52 2 , media types 5 and 6 have been deleted, since it is not supported by network A 50 . Deleting the media type is performed by removing all of the information of the unsupported media type.
- FIG. 6 is an example of the SIP invite message 44 of FIG. 2 with the media types deleted, as shown as SIP invite 52 .
- network A 50 does not support video media types, (video media 1 and 2 ).
- the information concerning video media 1 and 2 is deleted, leaving only audio media 3 and 4 .
- the P-CSCF 48 then forwards the modified SIP invite 52 2 to the S-CSCF 54 of network B 58 for further handling (routing and validation).
- the S-CSCF 54 of network B 58 examines the SIP invite 52 2 including the modified SDP message.
- the S-CSCF 54 will remove unauthorized media types that UE-A 46 is not permitted to use under its SLA, ( 78 ).
- the S-CSCF 54 (which usually exists in the UE home network) also removes any not permitted media contents. In the FIG. 5 example, media type 1 is deleted, as shown for SIP invite 52 3 . If UE-A 46 is in its home network, typically both the P-CSCF and S-CSCF function 46 , 54 are performed by the home network, with only the S-CSCF 54 deleting media types.
- the S-CSCF 54 forwards the further modified SIP invite 52 3 to UE-B's home network, network C 64 , through its I-CSCF 56 (Intorgating-CSCF).
- the S-CSCF 62 of network C 64 removes media types not permitted under UE-B's SLA, ( 80 ).
- P-CSCF 66 removes unsupported media types of the current network, where UE-B is roaming, ( 82 ). As shown in FIG. 5 , no additional media types are deleted in SIP invite 52 5 . If UE-B 68 is in its home network, typically the S-CSCF and P-CSCF functions 62 , 66 are performed by the home network, with the S-CSCF 62 deleting the media types.
- UE-B 68 examines the remaining SDP media types of the SIP invite 52 5 and determines if it can support them. If it can, it selects one or more of the remaining media types and sends UE-A 48 , a session progress message 72 , ( 84 ), through the network D P-CSCF 66 . If it can not support any of the media types or none remain in the SDP information, UE-B 68 also sends a session progress message with all the media types deleted.
- FIG. 7 is an example of a SPM 72 .
- UE-B 68 receives the SIP invite 52 of FIG. 6 .
- UE-B 68 is capable of supporting audio media 3 .
- a SPM 72 is generated at UE-B 68 only containing the selected media type, audio media 3 , and a header and global information. Audio media type 4 is not included.
- the P-CSCF 66 Upon reception of the SPM 72 , the P-CSCF 66 authorizes network D 70 to allocated the resources for the sessions indicated by the media type information, ( 86 ).
- the SPM progresses to UE-A 46 through the network C S-CSCF 62 , the network B S-CSCF 54 and the network A P-CSCF 48 .
- the network A P-CSCF 48 authorizes network A 50 to allocate the resources for the indicated session(s), ( 88 ).
- UE-A 46 determines the initial CODEC(S) to use for the media session(s) of the SPM 72 , ( 90 ).
- UE-A 46 sends a final SPM to UE-B 68 , through the same path, indicating the selected CODEC(S).
- UE-A reserves the resources for the selected CODEC, ( 92 ), and, if successful, sends a success message to UE-B 68 .
- UE-B After UE-B receives the final SPM, it reserves resources for the selected CODEC, ( 94 ).
- UE-B 68 When UE-B 68 receives the success message, it stops sending messages with its old CODEC, sets up the receiver for the new CODEC and sends an O.K. message to UE-A, ( 98 ). After UE-A 98 receives the O.K. message, it sends a success message with the new CODEC and sets up the receiver for the new CODEC, ( 98 ). After UE-B 68 receives the success message, it starts sending data with the new CODEC, ( 100 ).
Abstract
Method and Apparatus for making more efficient use of air link resources and network capacity in a mobile telecommunications system in which unauthorized and/or unsupported media types transmitted in a session initialization protocol (SIP) message sent from one equipment user (UE) to another are deleted by the network(s) as the SIP message is routed through the system.
Description
- This application is a continuation of U.S. patent application Ser. No. 10/022,998 filed Dec. 18, 2001, which claims the benefit of U.S. Provisional Patent Application No. 60/294,192, filed on May 29, 2001, which are incorporated by reference as if fully set forth.
- The present invention relates to wireless telecommunications. More specifically, the present invention relates to a technique for reducing unnecessary consumption of the air link resources and network capacity by reducing the size of transmitted messages.
- The current third generation partnership project (3GPP) and internet engineering task force (IETF) session description protocol (SDP) protocol (RFC 2327) mandate that the proxy call state control functions (P-CSCF), the serving call state control functions (S-CSCFs) and the terminating end user (User Equipment UE) to examine the media contents of the session description protocol (SDP) text in the session initialization protocol (SIP) message.
-
FIG. 1 shows a simplified session initiation system. A user, UE-A 20, desires to initiate a media session with another user UE-B 40. InFIG. 1 , UE-A 20 is shown as “roaming” innetwork A 22, not its home network. UE-A 20 sends a SIP invitemessage 44 1 to UE-B 40 via network A 22. The UE-A SIP invite 44 1 indicates all the media types that it can support. As shown inFIG. 1 , the SIP invite 44 1 has a header, global information, and a list of the supported media types (media 1 to media 6). The supported media types include information for each media, such as the CODEC type, stream format, stream bit rate, and communication port number. Under the proposed system, there are no limits on the number of media types that a UE can include in the SIP invite message. -
FIG. 2 is an example of a SIP invite message. The SIP invite message has a header, global information and supported media types for UE-A 20 for potential use in the proposed media session. The header includes various overhead information, such as the origin and destination of the SIP invite. The global information includes information common to all the proposed media types, such as the destination address and the proposed session identification (ID) number. The supported media types are listed. In this example, four media types are listed, two video (video media 1 and video media 2) and two audio (audio media 3 and audio media 4). Each proposed media session includes information regarding the media session, such as the port number, real time protocol (RTP) payload type and RTP format and clock rate port. - UE-A 20 sends the SIP invite to its current network, such as
network A 22, in which it is currently located. UE-A may be “roaming,” as shown inFIG. 1 and communicating with a network,network A 22, or it may be in its home network,network B 30. TheSIP invite 44 1 is examined by a P-CSCF 24 of its current network, such asnetwork A 22, for routing to its destination, UE-B 40 via UE-A's home network,network B 30. The P-CSCF 24 examines the session description protocol (SDP) multimedia contents of the SIP invite 44 1 for validation and authorization. If the P-CSCF's network,network A 24, does not support any part of the media information, (such as the CODESs, bit rate or the type), it flags that portion of the media information by setting the port number to “0” and leaving the other contents of the media information untouched, as shown formedia -
FIG. 3 is an example of such a flagged SIP invite 44. To illustrate, the P-CSCF cannot supportvideo media 1. As shown inFIG. 3 , the port number is set to “0” so that UE-B 40 realized thatvideo media 1 cannot be selected for the media session. - The network A P-CSCF 24 forwards the modified SIP invite 44 2 to the network B S-CSCF 26 for further handling, routing and validation. If UE-A 20 is in the home network, both the P-CSCF and S-CSCF function are performed by the
home network 30. The network B S-CSCF 26 examines the SIP invite 44 2 including the media information. Media types not supported by UE-A's service license agreement (SLA) are flagged. If UE-A 20 is in its home network, the flagging process is only performed by the S-CSCF 26, not by the P-CSCF 24. The S-CSCF 26 forwards the SIP invite 44 3 to UE-B's home network, network C36, using intorgating-CSCFS (I-CSCF) 28, 32. - The network C S-CSCF 34 similarly examines the SIP invite 44 3 for media types not available under UE-B's SLA. The not available media types are flagged, as illustrated for
media 1 and ofSIP 44 4. If UE-B 40 is not in its home network, as shown, the SIP invite 44 4 is forwarded to the P-CSCF 38 of the network, network D 42, where UE-B 40 is currently located, or “roaming.” If UE-B 40 is in its home network, the SIP invite 44 4 is forwarded to the P-CSCF 38 of the home network. - The P-CSCF 38 flags the media types not supported by the network, network D. No additional flagged media types are shown in SIP invite 44 5. If the UE-B is in its home network, the flagging is only performed by the S-CSCF 34. The P-CSCF 38 sends the SIP invite 44 5 to UE-B 40. UE-B 40 examines the media information of the SIP invite 44 5 and determines whether it is capable of using any of the unflagged media types. If it can not use any of the unflagged media types or there are not any remaining unflagged media types, UE-B 40 sends UE-A 20 a session description protocol message (SPM) 46 with all media types flagged. If it can use the unflagged media types, UE-B 40 selects one or more of the available media types for the session. The selected media types unflagged and the flagged media types are returned to UE-A 20 in the SPM 44.
- As shown in
FIGS. 2 and 3 , the SIP invitemessage 44 is large and, accordingly, consumes valuable air interface and wireless network resources. This resource consumption either degrades the network performance or reduces the maximum number of users serviced by the networks. - Accordingly, it is desirable to have alternate approaches for media session initiation.
- The present invention reduces the size of the SIP message by eliminating or deleting unsupported and/or unauthorized media types in the SIP along the signaling route from the originating end user to the terminating one and back. The present invention restricts the media information carried within the SIP message to information that is allowed by the network and authorized for the users at both ends.
-
FIG. 1 is an example of an overall system diagram for media session initiation. -
FIG. 2 is an example of a Session Initialization Protocol (SIP) message. -
FIG. 3 is an example of a SIP message with a flagged media type. -
FIGS. 4 a and 4 b are signaling diagrams. -
FIG. 5 is an example of an overall system diagram. -
FIG. 6 is an example of a SIP message. -
FIG. 7 is an example of a SIP message with removed media information. -
FIGS. 4 a and 4 b is a signaling diagram of the present invention.FIG. 5 illustrates an example of the components of the media session initiation. UE-A 46 desires to initiate a media session with UE-B 68. UE-A 46 and UE-B 48 may be any wireless communication device, such as a mobile phone, personal computer (PC) or personal digital assistant (PDA). UE-A 46 in the system of FIG. 5 is shown as “roaming” innetwork A 50. ForFIG. 1 ,network B 58 is the “home” network for UE-A 46. Alternately, UE-A 46 may be in its home network. - UE-
A 46 determines the CODECS available for the media types for the proposed session, (74). A SIP invite 52 1, such as shown inFIG. 2 , is composed using this information. UE-A 46 sends the SIP invitemessage 52 1 intended for UE-B 58 via network A is P-CSCF 48. UE-B 68 is shown as “roaming” innetwork D 70. Alternately, UE-B 68 may be in its home network,network C 64. The SIP invite 52 1 includes all the media types that UE-A 46 can support and invites UE-B 68 to choose the type(s) that it can support. The media information includes the CODEC types, stream format, stream bit rate, and communication port number, among other media attributes. Under the current proposed system, there are no limits on the number of media types that a UE can include in the SIP invitemessage 52 1. Furthermore, there are no restrictions on the end user, such as UE-B 68 to include unauthorized unsupported media types. - The P-
CSCF 48, incorporated in network A, routes the SIP invite 52 1 to the end user (UE-B 68). The P-CSCF function 48 initiates examination of the SIP invitemessage 52 1 for routing and for validation and authorization of the SDP multimedia contents. Ifnetwork A 50 does not support any part of the media information (such as the CODECS, the bit rate or the media type), P-CSCF 48 deletes the media entry from the SDP message leaving only the supported media entries, (76), as shown as SIP invite 52 2. In the example SIP invite 52 2,media types network A 50. Deleting the media type is performed by removing all of the information of the unsupported media type. -
FIG. 6 is an example of the SIP invitemessage 44 ofFIG. 2 with the media types deleted, as shown as SIP invite 52. To illustrate,network A 50 does not support video media types, (video media 1 and 2). As shown inFIG. 6 , the information concerningvideo media audio media CSCF 48 then forwards the modified SIP invite 52 2 to the S-CSCF 54 ofnetwork B 58 for further handling (routing and validation). The S-CSCF 54 ofnetwork B 58 examines the SIP invite 52 2 including the modified SDP message. The S-CSCF 54 will remove unauthorized media types that UE-A 46 is not permitted to use under its SLA, (78). The S-CSCF 54 (which usually exists in the UE home network) also removes any not permitted media contents. In theFIG. 5 example,media type 1 is deleted, as shown for SIP invite 52 3. If UE-A 46 is in its home network, typically both the P-CSCF and S-CSCF function CSCF 54 deleting media types. - The S-
CSCF 54 forwards the further modified SIP invite 52 3 to UE-B's home network,network C 64, through its I-CSCF 56 (Intorgating-CSCF). After receiving the SIP invite 52 3 via its I-CSCF 60, the S-CSCF 62 ofnetwork C 64 removes media types not permitted under UE-B's SLA, (80). After forwarding the SIP invite 52 4 to UE-B'scurrent network D 70, P-CSCF 66 removes unsupported media types of the current network, where UE-B is roaming, (82). As shown inFIG. 5 , no additional media types are deleted in SIP invite 52 5. If UE-B 68 is in its home network, typically the S-CSCF and P-CSCF functions 62, 66 are performed by the home network, with the S-CSCF 62 deleting the media types. - UE-
B 68 examines the remaining SDP media types of the SIP invite 52 5 and determines if it can support them. If it can, it selects one or more of the remaining media types and sends UE-A 48, asession progress message 72, (84), through the network D P-CSCF 66. If it can not support any of the media types or none remain in the SDP information, UE-B 68 also sends a session progress message with all the media types deleted. -
FIG. 7 is an example of aSPM 72. To illustrate a possible derivation forSPM 72, UE-B 68 receives the SIP invite 52 ofFIG. 6 . UE-B 68 is capable of supportingaudio media 3. ASPM 72 is generated at UE-B 68 only containing the selected media type,audio media 3, and a header and global information.Audio media type 4 is not included. - Upon reception of the
SPM 72, the P-CSCF 66 authorizesnetwork D 70 to allocated the resources for the sessions indicated by the media type information, (86). The SPM progresses to UE-A 46 through the network C S-CSCF 62, the network B S-CSCF 54 and the network A P-CSCF 48. The network A P-CSCF 48 authorizesnetwork A 50 to allocate the resources for the indicated session(s), (88). After the P-CSCF 48 sends theSPM 72 to UE-A 46, UE-A 46 determines the initial CODEC(S) to use for the media session(s) of theSPM 72, (90). - UE-
A 46 sends a final SPM to UE-B 68, through the same path, indicating the selected CODEC(S). At the same time as sending the final message, UE-A reserves the resources for the selected CODEC, (92), and, if successful, sends a success message to UE-B 68. After UE-B receives the final SPM, it reserves resources for the selected CODEC, (94). - When UE-
B 68 receives the success message, it stops sending messages with its old CODEC, sets up the receiver for the new CODEC and sends an O.K. message to UE-A, (98). After UE-A 98 receives the O.K. message, it sends a success message with the new CODEC and sets up the receiver for the new CODEC, (98). After UE-B 68 receives the success message, it starts sending data with the new CODEC, (100).
Claims (5)
1. A method of establishing a multimedia communication session between a first user equipment (UE) and a second UE through a plurality of networks having functions, the functions including a first proxy call state control function (P-CSCF) associated with the first UE and a first network, a first serving call state control function (S-CSCF) associated with the first UE and a second network, a first interrogating call state control function (I-CSCF) associated with the first UE and the second network, a second interrogating call state control function (I-CSCF) associated with the second UE and a third network, a second serving call state control function (S-CSCF) associated with the second UE and the third network, and a second proxy call state control function (P-CSCF) associated with the second UE and a fourth network, the method comprising:
the first UE generating a session initialization protocol (SIP) message for the second UE, setting forth the media types the first UE supports for potential use in a proposed multimedia communication session;
the first UE sending the SIP message to the first P-CSCF;
the first P-CSCF receiving the SIP message and deleting therefrom media types not supported by said first network to form a first modified SIP, and sending the first modified SIP message to the first S-CSCF;
the first S-CSCF receiving the first modified SIP, deleting therefrom media types the first UE is not authorized to use to form a second modified SIP, and sending the second modified SIP to the first I-CSCF;
the first I-CSCF receiving the second modified SIP and routing the second modified SIP to the second I-CSCF;
the second I-CSCF receiving the second modified SIP and sending the second modified SIP to a second S-CSCF;
the second S-CSCF receiving the second modified SIP and deleting therefrom media types the second UE is not authorized to use to form a third modified SIP, and sending the third modified SIP to the second P-CSCF;
the second P-CSCF receiving the third modified SIP and deleting therefrom media types not supported by the fourth network to form a fourth modified SIP, and sending the fourth modified SIP to the second UE; and
the second UE receiving the fourth modified SIP and deleting therefrom media types not supported by the second UE, and selecting at least one media type not deleted to form a session description protocol message (SPM) for the first UE, and sending the SPM for the first UE to the second P-CSCF.
2. The method of claim 1 wherein the deleting of media types comprises removing all of the information of the media types.
3. The method of claim 1 further comprising:
the second P-CSCF authorizing the fourth network to allocate resources for the multimedia session indicated by media types in the SPM, and sending the SPM to the second S-CSCF;
the second S-CSCF receiving the SPM and sending it to the second I-CSCF;
the second I-CSCF receiving the SPM and sending it to the first I-CSCF;
the first I-CSCF receiving the SPM and sending it to the first S-CSCF;
the first S-CSCF receiving the SPM and sending it to the first P-CSCF;
the first P-CSCF receiving the SPM and authorizing the first network to allocate resources for the multimedia session indicated by media types in the SPM, and sending the SPM to the first UE.
4. The method of claim 3 further comprising the first UE:
receiving the SPM;
determining the media types in the SPM;
selecting at least one media type to use for the multimedia communication session;
sending a final SPM message indicating said selected media type to the second UE;
reserving resources needed for the multimedia communication session;
if the resources are successfully reserved, sending a success message to the second UE.
5. The method of claim 4 further comprising:
the second UE receiving the final SPM message and the success message;
the second UE reconfiguring to use said selected media type;
the second UE sending an O.K. message to the first UE;
the first UE receiving the O.K. message;
the first UE reconfiguring to use said selected media type;
the first UE sending another success message to the second UE;
the second UE receiving the another success message; whereby the multimedia communication session is established.
Priority Applications (1)
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US11/801,102 US20070211683A1 (en) | 2001-05-29 | 2007-05-08 | System and method for reducing information communicated between universal mobile telecommunication system multimedia capable units |
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US11/801,102 US20070211683A1 (en) | 2001-05-29 | 2007-05-08 | System and method for reducing information communicated between universal mobile telecommunication system multimedia capable units |
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CA2448653A1 (en) | 2002-12-05 |
KR20050091101A (en) | 2005-09-14 |
KR20080020692A (en) | 2008-03-05 |
NO20035334D0 (en) | 2003-11-28 |
EP1390770A1 (en) | 2004-02-25 |
EP1390770A4 (en) | 2009-10-28 |
TW200737848A (en) | 2007-10-01 |
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TW200627874A (en) | 2006-08-01 |
JP3853788B2 (en) | 2006-12-06 |
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MXPA03010879A (en) | 2004-02-17 |
TWI264233B (en) | 2006-10-11 |
KR20070102578A (en) | 2007-10-18 |
KR20040007625A (en) | 2004-01-24 |
JP2004529584A (en) | 2004-09-24 |
TW200420157A (en) | 2004-10-01 |
KR100594790B1 (en) | 2006-07-03 |
WO2002097458A1 (en) | 2002-12-05 |
CN1545623A (en) | 2004-11-10 |
US7218626B2 (en) | 2007-05-15 |
US20020181424A1 (en) | 2002-12-05 |
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