System and method for reducing information communicated between universal mobile telecommunication system multimedia capable units

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.

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.