Inter-rat handover to UTRAN with simultaneous PS and CS domain services

A wireless device comprising a central processing unit (CPU) and memory, the memory containing program code executable by the CPU for performing the following steps:

• receiving a HANDOVER TO UTRAN COMMAND message from a first RAT system to perform a handover to Universal Terrestrial Radio Access Network (UTRAN) procedure;
• parsing the HANDOVER TO UTRAN COMMAND to determine what connections are handed over during the handover to UTRAN procedure, wherein the program code associated with parsing the HANDOVER TO UTRAN COMMAND to determine what connections are handed over during the handover to UTRAN procedure is capable of performing the following steps:
• determining a CS signaling connection is handed over if an information element (IE) “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and a core network (CN) domain identity of an IE “RAB information for setup” is a CS domain;
• determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and the core CN domain identity of the IE “RAB information for setup” is a PS domain;
• determining a CS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, an IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by an IE “Predefined configuration identity” is the CS domain;
• determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by the IE “Predefined configuration identity” is the PS domain;
• determining a CS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and a CN domain identity of an IE “RAB info” is the CS domain;
• and
• determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and the CN domain identity of the IE “RAB info” is the PS domain;
• and
• in response to parsing the HANDOVER TO UTRAN COMMAND message and determining that only circuit switched (CS) connections are handed over during the handover to UTRAN procedure when both CS and packet switched (PS) services are ongoing in the first RAT system upon reception of the HANDOVER TO UTRAN COMMAND message, causing a radio resource control (RRC) layer within the wireless device to inform an upper layer within the wireless device that no PS radio access bearers or no PS signaling connections are present.

A wireless system comprising:

• a base station network comprising a Universal Mobile Telecommunications System (UMTS) network and a non-UMTS network;
• and
• a user equipment (UE) capable of establishing simultaneous packet switched (PS) and circuit switched (CS) connections with the base station network;
• wherein the base station network further comprises:
• means for generating and transmitting a HANDOVER TO UTRAN COMMAND message to the UE when CS and PS services are being simultaneously supported by the UE for performing a handover to UTRAN procedure to hand over the UE to the UMTS network from the non-UMTS network, the HANDOVER TO UTRAN COMMAND message excluding information used for handing over PS connections to the UMTS network so that the handover procedure hands over only CS connections;
• wherein the UE further comprises:
• means for parsing the HANDOVER TO UTRAN COMMAND message to determine what connections are handed over during the handover to UTRAN procedure, wherein the means for parsing the HANDOVER TO UTRAN COMMAND message is capable of performing the following steps:
• determining a CS signaling connection is handed over if an information element (IE) “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and a core network (CN) domain identity of an IE “RAB information for setup” is a CS domain;
• determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and the core CN domain identity of the IE “RAB information for setup” is a PS domain;
• determining a CS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, an IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by an IE “Predefined configuration identity” is the CS domain;
• determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by the IE “Predefined configuration identity” is the PS domain;
• determining a CS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and a CN domain identity of an IE “RAB info” is the CS domain;
• and
• determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and the CN domain identity of the IE “RAB info” is the PS domain;
• and
• means for causing a radio resource control (RRC) layer within the UE to inform an upper layer within the UE that no PS radio access bearers or no PS signaling connections are present in response to parsing the HANDOVER TO UTRAN COMMAND message and determining that only CS connections are handed over during the handover to UTRAN procedure when both CS and PS services are being simultaneously supported by the UE.

A method for performing an inter system handover to Universal Terrestrial Radio Access Network (UTRAN) procedure for a wireless device, the method comprising:

• receiving a HANDOVER TO UTRAN COMMAND message from a first radio access technology (RAT) system for performing a handover to UTRAN procedure;
• parsing the HANDOVER TO UTRAN COMMAND message to determine what connections are handed over during the handover to UTRAN procedure, wherein parsing the HANDOVER TO UTRAN COMMAND message to determine what connections are handed over during the handover to UTRAN procedure comprises:
• determining a CS (Circuit Switched) connection is handed over if an information element (IE) “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and a core network (CN) domain identity of an IE “RAB information for setup” is a CS domain;
• determining a PS (Packet Switched) connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and the core CN domain identity of the IE “RAB information for setup” is a PS domain;
• determining a CS connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, an IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by an IE “Predefined configuration identity” is the CS domain;
• determining a PS connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by the IE “Predefined configuration identity” is the PS domain;
• determining a CS connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and a CN domain identity of an IE “RAB info” is the CS domain;
• and determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and the CN domain identity of the IE “RAB info” is the PS domain;
• in response to the wireless device parsing the HANDOVER TO UTRAN COMMAND message and determining that the CS connection is handed over during the handover to UTRAN procedure, a radio resource control (RRC) layer within the wireless device determining that a CS signaling connection exists;
• and in response to the wireless device parsing the HANDOVER TO UTRAN COMMAND message and determining that the PS connection is handed over during the handover to UTRAN procedure, the RRC layer within the wireless device determining that the PS signaling connection exists.

A wireless device comprising a central processing unit (CPU) and memory, the memory containing program code executable by the CPU for performing the following steps:

• receiving a HANDOVER TO UTRAN COMMAND message from a first radio access technology (RAT) system to perform a handover to Universal Terrestrial Radio Access Network (UTRAN) procedure;
• parsing the HANDOVER TO UTRAN COMMAND message to determine what connections are handed over during the handover to UTRAN procedure, wherein the program code associated with parsing the HANDOVER TO UTRAN COMMAND message to determine what connections are handed over during the handover to UTRAN procedure is capable of performing the following steps:
• determining a CS (Circuit Switched) signaling connection is handed over if an information element (IE) “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and a core network (CN) domain identity of an IE “RAB information for setup” is a CS domain;
• determining a PS (Packet Switched) signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Complete specification” and the core CN domain identity of the IE “RAB information for setup” is a PS domain;
• determining a CS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, an IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by an IE “Predefined configuration identity” is the CS domain;
• determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Predefined configuration”, and the CN domain identity of the IE “RAB information for setup” identified by the IE “Predefined configuration identity” is the PS domain;
• determining a CS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and a CN domain identity of an IE “RAB info” is the CS domain;
• and determining a PS signaling connection is handed over if the IE “Specification mode” in the HANDOVER TO UTRAN COMMAND message is set to “Preconfiguration”, the IE “Preconfiguration mode” is set to “Default configuration”, and the CN domain identity of the IE “RAB info” is the PS domain;
• in response to parsing the HANDOVER TO UTRAN COMMAND message and determining that the CS signaling connection is handed over during the handover to UTRAN procedure, causing a radio resource control (RRC) layer within the wireless device to determine that the a CS signaling connection exists;
• and in response to parsing the HANDOVER TO UTRAN COMMAND message and determining that the PS signaling connection is handed over during the handover to UTRAN procedure, causing the RRC layer within the wireless device to determine that the PS signaling connection exists.