# US 8,571,562 B2 · Method and apparatus for cell change order > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,571,562 B2 - Document ID: US8571562B2 - Status: Granted - Kind: B2 - Application number: 12/024,299 - Filed: 2008-02-01 - Published: 2008-08-14 - Granted: 2013-10-29 - Earliest claimed: 2007-02-09 - Assignees: QUALCOMM Incorporated - Applicants: Mohit Narang; Mukesh Mittal - Inventors: Mohit Narang; Mukesh Mittal - Web page: https://patentgrep.com/patent/US8571562B2 ## CPC - H04W 48/16: Discovering, processing access restriction or access information - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method and apparatus for cell change order including issuing or receiving a cell change order message to find a target cell in a network with no compressed mode measurement, performing a power scan on the network to find a suitable cell if the target cell is not found, and camping on the suitable cell if found. In one aspect, the network is a 2G network. In yet another aspect, the network is a GSM network. ## Claims ### Claim 1 A method for performing a cell change comprising: operating user equipment on a second network; receiving at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; performing a power scan on the first network, in response to the cell change order, to find a suitable cell if the target cell is not found; and camping on the suitable cell if the suitable cell is found. ### Claim 2 (depends on 1) The method of claim 1 further comprising completing a Location Area/Routing Area (LA/RA) procedure. ### Claim 3 (depends on 1) The method of claim 1 wherein the suitable cell is within a Public Land Mobile Network. ### Claim 4 (depends on 1) The method of claim 1 further comprising determining if the user equipment has not found the target cell. ### Claim 5 (depends on 4) The method of claim 4 further comprising determining if there is no dedicated resource in the second network reserved for the user equipment. ### Claim 6 (depends on 5) The method of claim 5 further comprising determining if the suitable cell is found. ### Claim 7 (depends on 6) The method of claim 6 wherein the first network is a 2G network and the second network is a 3G network. ### Claim 8 (depends on 6) The method of claim 6 wherein the first network is a GSM network and the second network is a UMTS network. ### Claim 9 (depends on 6) The method of claim 6 wherein the suitable cell is within a Public Land Mobile Network. ### Claim 10 (depends on 5) The method of claim 5 wherein the dedicated resource is dedicated by a radio network controller. ### Claim 11 (depends on 1) The method of claim 1 further comprising determining if there is no dedicated resource in the second network reserved for the user equipment. ### Claim 12 (depends on 11) The method of claim 11 wherein the dedicated resource is dedicated by a radio network controller. ### Claim 13 (depends on 1) The method of claim 1 further comprising determining if the suitable cell has been found. ### Claim 14 (depends on 13) The method of claim 13 wherein the suitable cell is within a Public Land Mobile Network. ### Claim 15 (depends on 1) The method of claim 1 wherein the first network is a 2G network. ### Claim 16 (depends on 1) The method of claim 1 wherein the first network is a GSM network. ### Claim 17 A method for performing a cell change comprising: operating user equipment on a second network; receiving at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; determining if the user equipment found the target cell; determining if a dedicated resource in the second network is reserved for the user equipment if the target cell is not found; performing a power scan on the first network, in response to the cell change order, to find a suitable cell if there is no dedicated resource in the second network; determining if the suitable cell is found; and returning to the second network if the suitable cell is not found or camping on the suitable cell if the suitable cell is found. ### Claim 18 (depends on 17) The method of claim 17 wherein the first network is a 2G network and the second network is a 3G network. ### Claim 19 (depends on 17) The method of claim 17 wherein the first network is a GSM network and the second network is a UMTS network. ### Claim 20 (depends on 17) The method of claim 17 further comprising completing a Location Area/Routing Area (LA/RA) procedure. ### Claim 21 (depends on 17) The method of claim 17 wherein the suitable cell is within a Public Land Mobile Network. ### Claim 22 A method for performing a cell change comprising: operating user equipment on a second network; receiving at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; determining that the user equipment found the target cell; and camping on the target cell. ### Claim 23 A user equipment comprising a processor and a memory, the memory containing program code executable by the processor for performing the following: operating the user equipment on a second network; receiving at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; performing a power scan on the first network, in response to the cell change order, to find a suitable cell if the target cell is not found; and camping on the suitable cell if the suitable cell is found. ### Claim 24 (depends on 23) The user equipment of claim 23 wherein the memory further contains program code executable by the processor to determine if the user equipment has not found the target cell. ### Claim 25 (depends on 23) The user equipment of claim 23 wherein the memory further contains program code executable by the processor to determine if there is no dedicated resource in the second network reserved for the user equipment. ### Claim 26 (depends on 25) The user equipment of claim 25 wherein the first network is a 2G network and the second network is a 3G network. ### Claim 27 (depends on 25) The user equipment of claim 25 wherein the first network is a GSM network and the second network is a UMTS network. ### Claim 28 (depends on 23) The user equipment of claim 23 wherein the memory further contains program code executable by the processor to determine if the suitable cell has been found. ### Claim 29 A user equipment comprising a processor and a memory, the memory containing program code executable by the processor for performing the following: operating the user equipment on a second network; receiving at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; determining if the user equipment found the target cell; determining if a dedicated resource in the second network is reserved for the user equipment if the target cell is not found; performing a power scan on the first network, in response to the cell change order, to find a suitable cell if there is no dedicated resource in the second network; determining if the suitable cell is found; and returning to the second network if the suitable cell is not found or camping on the suitable cell if the suitable cell is found. ### Claim 30 (depends on 29) The user equipment of claim 29 wherein the first network is a 2G network and the second network is a 3G network. ### Claim 31 (depends on 29) The user equipment of claim 29 wherein the first network is a GSM network and the second network is a UMTS network. ### Claim 32 A user equipment comprising a processor and a memory, the memory containing program code executable by the processor for performing the following: operating the user equipment on a second network; receiving at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; determining that the user equipment found the target cell; and camping on the target cell. ### Claim 33 A non transitory computer-readable medium including program code stored thereon, the program code executable by a processor, comprising: program code to operate user equipment on a second network; program code to receive at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; program code to perform a power scan on the first network, in response to the cell change order, to find a suitable cell if the target cell is not found; and program code to camp on the suitable cell if the suitable cell is found. ### Claim 34 (depends on 33) The non transitory computer-readable medium of claim 33 further comprising program code to determine if the user equipment has not found the target cell. ### Claim 35 (depends on 33) The non transitory computer-readable medium of claim 33 further comprising program code to determine if there is no dedicated resource in the second network reserved for the user equipment. ### Claim 36 (depends on 33) The non transitory computer-readable medium of claim 33 further comprising program code to determine if the suitable cell has been found. ### Claim 37 (depends on 35) The non transitory computer-readable medium of claim 35 wherein the first network is a 2G network and the second network is a 3G network. ### Claim 38 (depends on 35) The non transitory computer-readable medium of claim 35 wherein the first network is a GSM network and the second network is a UMTS network. ### Claim 39 A non transitory computer-readable medium including program code stored thereon, the program code executable by a processor, comprising: program code to operate user equipment on a second network; program code to receive at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; program code to determine if the user equipment found the target cell; program code to determine if a dedicated resource in the second network is reserved for the user equipment if the target cell is not found; program code to perform a power scan on the first network, in response to the cell change order, to find a suitable cell if there is no dedicated resource in the second network; program code to determine if the suitable cell is found; and program code to return to the second network if the suitable cell is not found or camping on the suitable cell if the suitable cell is found. ### Claim 40 (depends on 39) The non transitory computer-readable medium of claim 39 wherein the first network is a 2G network and the second network is a 3G network. ### Claim 41 (depends on 39) The non transitory computer-readable medium of claim 39 wherein the first network is a GSM network and the second network is a UMTS network. ### Claim 42 A non transitory computer-readable medium including program code stored thereon, the program code executable by a processor, comprising: program code to operate user equipment on a second network; program code to receive at the user equipment a cell change order message from the second network requesting to find a target cell in a network, wherein no compressed mode measurements are used to influence the cell change order message; program code to determine that the user equipment found the target cell; and program code to camp on the target cell. ### Claim 43 An apparatus for performing a cell change comprising: means for operating user equipment on a second network; means for receiving at the user equipment a cell change order message from the second network requesting to find a target cell in a first network, wherein no compressed mode measurements are used to influence the cell change order message; means for performing a power scan on the first network, in response to the cell change order, to find a suitable cell if the target cell is not found; and means for camping on the suitable cell if the suitable cell is found.