Method and packet switched communication network with enhanced session establishment

Abstract

The present invention is a method and a system for session establishment in a packet switched communication network. A method of session establishment in a packet switched communication network having a session establishment control entity in accordance with the invention includes at the session establishment control entity processing information to be transmitted from caller user equipment to callee user equipment during session establishment to produce session establishment information by removing from the information to be transmitted from the caller user equipment to the callee user equipment information which would slow the session establishment if transmitted to the callee user equipment during session establishment; storing the information removed from the information to be transmitted from the caller user equipment to the callee user equipment; and completing session establishment by transmitting the session establishment information to the callee user equipment which is processed by the callee user equipment to complete session establishment.

1 . A method of session establishment in a packet switched communication network having a session establishment control entity comprising: 
 at the session establishment control entity processing information to be transmitted from caller user equipment to callee user equipment during session establishment to produce session establishment information by removing, from the information to be transmitted from the caller user equipment to the callee user equipment, information not necessary to session establishment, which would slow the session establishment if transmitted to the callee user equipment during session establishment;    storing the information removed from the information to be transmitted from the caller user equipment to the callee user equipment; and    completing session establishment by transmitting the session establishment information to the callee user equipment which is processed by the callee to complete session establishment.    
     
     
         2 . A method in accordance with  claim 1  wherein: 
 the removed information is stored in the packet switched communication network at an addressable location therein and an address of where the removed information is stored in the packet switched communication network is included with the session establishment information transmitted to the callee user equipment;  
 the callee user equipment sends a transmission after session establishment to the address; and  
 the packet switched communication network transmits the removed information to the callee user equipment from the address.  
 
     
     
         3 . A method in accordance with  claim 1  wherein: 
 the transmission of the session establishment information uses a SIP INVITE message.  
 
     
     
         4 . A method in accordance with  claim 1  wherein: 
 the session establishment control entity transmits the removed information to the callee after session establishment is complete.  
 
     
     
         5 . A method in accordance with  claim 4  wherein: 
 the transmission of the removed information uses the SIP INFO message.  
 
     
     
         6 . A method in accordance with  claim 1  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF).  
 
     
     
         7 . A method in accordance with  claim 2  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF).  
 
     
     
         8 . A method in accordance with  claim 3  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF).  
 
     
     
         9 . A method in accordance with  claim 4  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF).  
 
     
     
         10 . A method in accordance with  claim 2  wherein: 
 the address is a universal resource locator (URL).  
 
     
     
         11 . A method in accordance with  claim 7  wherein: 
 the address is a universal resource locator (URL).  
 
     
     
         12 . A method in accordance with  claim 1  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         13 . A method in accordance with  claim 2  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         14 . A method in accordance with  claim 4  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         15 . A method in accordance with  claim 5  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         16 . A method in accordance with  claim 6  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         17 . A method in accordance with  claim 7  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         18 . A method in accordance with  claim 9  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         19 . A method in accordance with  claim 10  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         20 . A method in accordance with  claim 11  wherein: 
 the removed information is stored at a server in the packet switched communication network.  
 
     
     
         21 . A method in accordance with  claim 1  wherein: 
 the callee user equipment is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         22 . A method in accordance with  claim 2  wherein: 
 the callee user equipment is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         23 . A method in accordance with  claim 3  wherein: 
 the callee user equipment is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         24 . A method in accordance with  claim 4  wherein: 
 the callee user equipment is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         25 . A method in accordance with  claim 21  wherein: 
 the session establishment control entity is a proxy call state control function (PCSCF).  
 
     
     
         26 . A method in accordance with  claim 12  wherein: 
 the callee user equipment is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         27 . A packet switched communication network comprising: 
 a session establishment control entity which processes information to be transmitted from caller user equipment to a callee user equipment during session establishment to produce session establishment information by removing, from the information to be transmitted from the caller user equipment to the callee user equipment, information not necessary to establishment of the session, which would slow the session establishment if transmitted to the callee during the session establishment; and    a storage which stores the information removed from the information to be transmitted from the caller user equipment to the callee user equipment; and wherein 
 session establishment is completed by transmitting the session establishment information to the callee user equipment which is processed at the callee user equipment to complete session establishment between the caller user equipment and the callee user equipment.  
   
     
     
         28 . A network in accordance with  claim 27  wherein: 
 the removed information is stored in the packet switched communication network at an addressable location therein and an address of where the removed information is stored in the packet switched communication network is included with the session establishment information transmitted to the callee user equipment;  
 the callee user equipment sends a transmission after session establishment to the address; and  
 the packet switched communication network transmits the removed information to the callee user equipment from the address.  
 
     
     
         29 . A network in accordance with  claim 27  wherein: 
 the transmission of session establishment information uses a SIP INVITE message.  
 
     
     
         30 . A network in accordance with  claim 27  wherein: 
 the session establishment control entity transmits the removed information to the callee after session establishment is complete.  
 
     
     
         31 . A network in accordance with  claim 30  wherein: 
 the transmission of the removed information uses the SIP INFO message.  
 
     
     
         32 . A network in accordance with  claim 27  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF)  
 
     
     
         33 . A network in accordance with  claim 28  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF)  
 
     
     
         34 . A network in accordance with  claim 29  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF)  
 
     
     
         35 . A network in accordance with  claim 30  wherein: 
 the session establishment control entity is one of a call state control function (CSCF) or a proxy call state control function (PCSCF)  
 
     
     
         36 . A network in accordance with  claim 28  wherein: 
 the address is a universal resource locator (URL).  
 
     
     
         37 . A network in accordance with  claim 33  wherein: 
 the address is a universal resource locator (URL).  
 
     
     
         38 . A system in accordance with  claim 27  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         39 . A system in accordance with  claim 28  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         40 . A system in accordance with  claim 30  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         41 . A system in accordance with  claim 31  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         42 . A system in accordance with  claim 32  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         43 . A system in accordance with  claim 33  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         44 . A system in accordance with  claim 35  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         45 . A system in accordance with  claim 36  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         46 . A system in accordance with  claim 37  wherein: 
 the storage is a server in the packet switched communication network.  
 
     
     
         47 . A network in accordance with  claim 27  wherein: 
 the callee user equipment is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         48 . A network in accordance with  claim 28  wherein: 
 the callee user equipment is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         49 . A network in accordance with  claim 30  wherein: 
 the callee is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         50 . A network in accordance with  claim 32  wherein: 
 the callee is within another network having a lower data transmission capacity than the packet switched data network.  
 
     
     
         51 . A network in accordance with  claim 47  wherein: 
 the session establishment control entity is a proxy call state control function (PCSCF).