# US 8,570,951 B1 · Apparatus and method for improved tune-away operations in (C+G) DSDS devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,951 B1 - Document ID: US8570951B1 - Status: Granted - Kind: B1 - Application number: 13/935,295 - Filed: 2013-07-03 - Granted: 2013-10-29 - Earliest claimed: 2013-07-03 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Anand Rajurkar; Parthasarathy Krishnamoorthy; Rashid Ahmed Akbar Attar; Priyangshu Ghosh - Web page: https://patentgrep.com/patent/US8570951B1 ## CPC - H04W 76/20: Manipulation of established connections - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Apparatus and methods are disclosed for establishing a call utilizing a traffic channel corresponding to a first communication protocol; transmitting a data rate control (DRC) channel comprising a null cover for no greater than 16 time slots; tuning away from the call to receive signaling corresponding to a second communication protocol; and following the receiving of the signaling corresponding to the second communication protocol, tuning back to the traffic channel to resume the call. ## Claims ### Claim 1 A method of wireless communication between a mobile device and a telecommunications network, comprising: establishing a call utilizing a traffic channel corresponding to a first communication protocol; transmitting a data rate control (DRC) channel comprising a null cover for a duration corresponding to a number of packet slots corresponding to reception of a single packet; tuning away from the call to receive signaling corresponding to a second communication protocol; and following the receiving of the signaling corresponding to the second communication protocol, tuning back to the traffic channel to resume the call. ### Claim 2 (depends on 1) The method of claim 1, further comprising: tuning away from the call to receive signaling corresponding to a third communication protocol; and following the receiving of the signaling corresponding to the third communication protocol, tuning back to the traffic channel to resume the call. ### Claim 3 (depends on 2) The method of claim 2, wherein the signaling corresponding to the second communication protocol message comprises a first page message, and wherein the signaling corresponding to the third communication protocol comprises a second page message. ### Claim 4 (depends on 3) The method of claim 3, wherein a time difference between the first page message and the second page message is less than 100 ms. ### Claim 5 (depends on 2) The method of claim 2, wherein the second communication protocol comprises one of IS-2000 1X or Global System for Mobile (GSM). ### Claim 6 (depends on 2) The method of claim 2, wherein the third communication protocol comprises one of IS-2000 1X or Global System for Mobile (GSM). ### Claim 7 (depends on 1) The method of claim 1, wherein the first communication protocol comprises Evolution-Data Optimized (EVDO). ### Claim 8 (depends on 1) The method of claim 1, wherein the duration corresponding to a number of packet slots corresponding to reception of a single packet is no greater than 16 time slots. ### Claim 9 (depends on 1) The method of claim 1, further comprising: determining the number of packet slots corresponding to reception of a single packet in accordance with a current DRC value transmitted on the DRC channel. ### Claim 10 An apparatus configured for wireless communication, comprising: at least one processor; a memory coupled to the at least one processor; and a communication interface coupled to the at least one processor, wherein the at least one processor is configured to: establish a call utilizing a traffic channel corresponding to a first communication protocol; transmit a data rate control (DRC) channel comprising a null cover for a duration corresponding to a number of packet slots corresponding to reception of a single packet; tune away from the call to receive signaling corresponding to a second communication protocol; and following the receiving of the signaling corresponding to the second communication protocol, tune back to the traffic channel to resume the call. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the at least one processor is further configured to: tune away from the call to receive signaling corresponding to a third communication protocol; and following the receiving of the signaling corresponding to the third communication protocol, tune back to the traffic channel to resume the call. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the signaling corresponding to the second communication protocol message comprises a first page message, and wherein the signaling corresponding to the third communication protocol comprises a second page message. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein a time difference between the first page message and the second page message is less than 100 ms. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the second communication protocol comprises one of IS-2000 1X or Global System for Mobile (GSM). ### Claim 15 (depends on 11) The apparatus of claim 11, wherein the third communication protocol comprises one of IS-2000 1X or Global System for Mobile (GSM). ### Claim 16 (depends on 10) The apparatus of claim 10, wherein the first communication protocol comprises Evolution-Data Optimized (EVDO). ### Claim 17 (depends on 10) The apparatus of claim 10, wherein the duration corresponding to a number of packet slots corresponding to reception of a single packet is no greater than 16 time slots. ### Claim 18 (depends on 10) The apparatus of claim 10, wherein the at least one processor is further configured to determine the number of packet slots corresponding to reception of a single packet in accordance with a current DRC value transmitted on the DRC channel. ### Claim 19 An apparatus configured for wireless communication, comprising: means for establishing a call utilizing a traffic channel corresponding to a first communication protocol; means for transmitting a data rate control (DRC) channel comprising a null cover for a duration corresponding to a number of packet slots corresponding to reception of a single packet; means for tuning away from the call to receive signaling corresponding to a second communication protocol; and means for, following the receiving of the signaling corresponding to the second communication protocol, tuning back to the traffic channel to resume the call. ### Claim 20 (depends on 19) The apparatus of claim 19, further comprising: means for tuning away from the call to receive signaling corresponding to a third communication protocol; and means for following the receiving of the signaling corresponding to the third communication protocol, tuning back to the traffic channel to resume the call. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the signaling corresponding to the second communication protocol message comprises a first page message, and wherein the signaling corresponding to the third communication protocol comprises a second page message. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein a time difference between the first page message and the second page message is less than 100 ms. ### Claim 23 (depends on 20) The apparatus of claim 20, wherein the first communication protocol comprises Evolution-Data Optimized (EVDO); wherein the second communication protocol comprises one of IS-2000 1X or Global System for Mobile (GSM); and wherein the third communication protocol comprises one of IS-2000 1X or Global System for Mobile (GSM). ### Claim 24 (depends on 19) The apparatus of claim 19, wherein the duration corresponding to a number of packet slots corresponding to reception of a single packet is no greater than 16 time slots. ### Claim 25 (depends on 19) The apparatus of claim 19, further comprising: means for determining the number of packet slots corresponding to reception of a single packet in accordance with a current DRC value transmitted on the DRC channel. ### Claim 26 A non-transitory computer storage medium, containing instructions which, when executed by a computer, configure a mobile device for wireless communication with a base station, by: establishing a call utilizing a traffic channel corresponding to a first communication protocol; transmitting a data rate control (DRC) channel comprising a null cover for a duration corresponding to a number of packet slots corresponding to reception of a single packet; tuning away from the call to receive signaling corresponding to a second communication protocol; and following the receiving of the signaling corresponding to the second communication protocol, tuning back to the traffic channel to resume the call. ### Claim 27 (depends on 26) The non-transitory computer storage medium of claim 26, further comprising instructions for: tuning away from the call to receive signaling corresponding to a third communication protocol; and following the receiving of the signaling corresponding to the third communication protocol, tuning back to the traffic channel to resume the call. ### Claim 28 (depends on 26) The non-transitory computer storage medium of claim 26, wherein the duration corresponding to a number of packet slots corresponding to reception of a single packet is no greater than 16 time slots. ### Claim 29 (depends on 26) The non-transitory computer storage medium of claim 26, further comprising instructions for determining the number of packet slots corresponding to reception of a single packet in accordance with a current DRC value transmitted on the DRC channel.