# US 7,613,169 B2 · Enhancement of packet transfer mode when circuit switched resources are requested > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,613,169 B2 - Document ID: US7613169B2 - Status: Granted - Kind: B2 - Application number: 10/802,407 - Filed: 2004-03-16 - Published: 2005-09-22 - Granted: 2009-11-03 - Earliest claimed: 2004-03-16 - Assignees: Nokia Corporation - Inventors: Rami Vaittinen; Antti Kangas - Web page: https://patentgrep.com/patent/US7613169B2 ## CPC - H04W 74/02: Hybrid access - H04W 72/00: Local resource management - Y10S 370/902: Packet switching - Y10S 370/913: Wireless or radio - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A mobile terminal and method are disclosed for use in a wireless communication system in order for the mobile terminal to be able to transition to a dual mode, in which a packet switched connection and circuit switched connection are used together, from a single mode in which packets are transferred. A packet associated control channel is used to convey a radio link control or multiple access control (RLC/MAC) message, and meanwhile packet switched resources are maintained. Then a dual transfer mode assignment message is received, as a result of using the packet associated channel to convey the radio link or multiple access control message. ## Claims ### Claim 1 A method in a wireless communication system for a mobile terminal to transition to a dual mode, in which a packet switched connection and circuit switched connection are used together, from a single mode in which packets are transferred, comprising: using a packet associated control channel to convey a radio link control or multiple access control message, maintaining packet switched resources, and receiving a dual transfer mode assignment message as a result of using the packet associated channel to convey the radio link control or multiple access control message. ### Claim 2 (depends on 1) The method of claim 1, wherein the radio link control or multiple access control message is from the mobile terminal to a network in order to request the circuit switched connection, and wherein the dual transfer mode assignment message is from the network to the mobile terminal in order to initiate establishment of the circuit switched connection and allocate resources. ### Claim 3 (depends on 1) The method of claim 1, wherein the dual transfer mode assignment message is conveyed by the radio link or multiple access control message from a network to the mobile terminal. ### Claim 4 (depends on 1) The method of claim 1, wherein the dual mode corresponds to a Class-A mode, and is preceded by a single mode corresponding to a Class-B or Class-C mode. ### Claim 5 (depends on 1) The method of claim 1, wherein the maintaining precludes idling packet resources. ### Claim 6 (depends on 2) The method of claim 2, wherein the radio link control or multiple access control message encapsulates at least one radio resource control message, or an additional radio link control or multiple access control message is introduced for each reply from the network. ### Claim 7 (depends on 6) The method of claim 6, wherein the radio link control or multiple access control message is a packet circuit switch command message. ### Claim 8 (depends on 6) The method of claim 6, wherein the radio link or multiple access control message is in response to paging by the network. ### Claim 9 (depends on 6) The method of claim 6, wherein the radio link or multiple access control message includes a packet circuit switch request. ### Claim 10 (depends on 6) The method of claim 6, wherein: the mobile terminal makes a plurality of attempts to send the radio link or multiple access control message, the mobile terminal starts a timer after the plurality of attempts, and if the timer expires then packet resources are released. ### Claim 11 (depends on 6) The method of claim 6, wherein if the network cannot allocate packet switched resources then packet resources are released. ### Claim 12 (depends on 6) The method of claim 6, wherein if the network cannot allocate circuit switched resources the mobile terminal continues in packet transfer mode only. ### Claim 13 (depends on 3) The method of claim 3, wherein the dual transfer mode assignment message or an immediate assignment message includes an indication of being sent instead of a packet paging request message. ### Claim 14 (depends on 1) A computer readable medium encoded with a software data structure sufficient to cause a processor to perform the method of claim 1. ### Claim 15 An apparatus for transitioning in a wireless communication system to a dual mode wherein a packet switched connection and circuit switched connection are used together, from a single mode wherein packets are transferred, comprising: a transceiver configured to use a packet associated control channel that conveys a radio link control or multiple access control message; and a processing unit configured to receive a dual transfer mode assignment message via the transceiver as a result of the radio link or multiple access control message, wherein the apparatus is configured to maintain the packet switched connection while the radio link or multiple access control message is conveyed and the dual transfer mode assignment message is received. ### Claim 16 (depends on 15) The apparatus of claim 15, further comprising: a packet switch device configured to process and communicate an uninterrupted data signal between the processing unit and the transceiver; and a circuit switch device, configured to process and communicate a voice signal between the processing unit and the transceiver, the voice signal being initiated after the dual transfer mode assignment message is received, wherein the apparatus is comprised by a mobile terminal. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the radio link or multiple access control message is transmitted by the transceiver, in order to request the circuit switched connection. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the radio link or multiple access control message is configured to convey the dual transfer mode assignment message, in order to initiate establishment of the circuit switched connection and allocate resources. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the dual mode corresponds to a Class-A mode, and is preceded by a single mode corresponding to a Class-B or Class-C mode. ### Claim 20 (depends on 15) The apparatus of claim 15, wherein maintaining the packet switched connection precludes idling packet resources. ### Claim 21 (depends on 17) The apparatus of claim 17, wherein the radio link control or multiple access control message encapsulates at least one radio resource control message, or an additional radio link control or multiple access control message is introduced for each reply from the network. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the radio link control or multiple access control message is a packet circuit switched command message. ### Claim 23 (depends on 21) The apparatus of claim 21, wherein the radio link or multiple access control message is in response to paging received by the transceiver. ### Claim 24 (depends on 21) The apparatus of claim 21, wherein the radio link or multiple access control message includes a packet circuit switch request. ### Claim 25 (depends on 21) The apparatus of claim 21, wherein: the mobile terminal is configured to make a plurality of attempts to send the radio link or multiple access control message, the mobile terminal is configured to start a timer after the plurality of attempts, and if the timer expires then packet resources are released by the mobile terminal. ### Claim 26 (depends on 21) The apparatus of claim 21, wherein the dual transfer mode assignment message is sent instead of a packet paging request. ### Claim 27 An apparatus for transitioning in a wireless communication system to a dual mode wherein a packet switched connection and circuit switched connection are used together, from a single mode wherein packets are transferred comprising: means for using a packet associated control channel that conveys a radio link control or multiple access control message; and means for receiving a dual transfer mode assignment message via the means for using the packet associate channel as a result of the radio link or multiple access control message, wherein the apparatus is also for maintaining packet switched connection while the radio link or multiple access control message is conveyed and the dual transfer mode assignment message is received. ### Claim 28 (depends on 27) The apparatus of claim 27, further comprising: means for processing and communicating an uninterrupted data signal between the processing unit and the transceiver; and means for processing and communicating a voice signal between the means for receiving the dual transfer mode assignment message and the means for using the packet associate channel, said voice signal being initiated after the dual transfer mode assignment message is received, wherein said apparatus is comprised by a mobile terminal. ### Claim 29 A computer readable medium encoded with a software data structure sufficient to cause a processor to perform a method comprising: using a packet associated control channel to convey a radio link control or multiple access control message, while in a packet-transfer mode, maintaining packet switched resources in the packet-transfer mode, and receiving a dual transfer mode assignment message as a result of using the packet associated channel to convey the radio link control or multiple access control message, wherein in the dual transfer mode a packet switched connection and circuit switched connection may be used together. ### Claim 30 (depends on 29) The computer readable medium of claim 29, wherein the radio link control or multiple access control message is from a mobile terminal to a network in order to request the circuit switched connection, and wherein the dual transfer mode assignment message is from the network to the mobile terminal in order to initiate establishment of the circuit switched connection and allocate resources.