Apparatus and method for improving device handover during a call

{
  "publication_number": "US9609552B2",
  "country": "US",
  "kind": "B2",
  "title": "Apparatus and method for improving device handover during a call",
  "abstract": "Disclosed are methods and apparatus for improving the performance of a user equipment handover during a data call. In one aspect, a source base station determines to handover user equipment (UE) to a target base station. The source base station first determines whether the UE is in a data call prior to the handover. The source base station then modifies one or more of connected mode discontinuous reception (CDRX) and semi-persistent scheduling (SPS) parameters with the UE based on determining to handover the UE and determining that the UE is in the data call.",
  "claims": [
    "1. A method for performing handover, comprising: communicating, by a serving base station, with a user equipment (UE) to provide wireless network access to the UE; determining, by the serving base station, to handover the UE to a target base station; determining, by the serving base station and based at least in part on evaluating one or more parameters including one or more of connected mode discontinuous reception (CDRX) parameters or semi-persistent scheduling (SPS) parameters with the UE, whether the UE is in a data call prior to the handover, wherein the data call is at least one of a voice over internet protocol (VoIP) call or a VoIP over long term evolution (VoLTE) call; and modifying, by the serving base station, the one or more parameters with the UE based on determining to handover the UE and determining that the UE is in the data call.",
    "2. The method of claim 1, wherein the modifying the one or more parameters comprises disabling a CDRX mode with the UE.",
    "3. The method of claim 1, wherein the modifying the one or more parameters comprises adjusting an OFF duration of the CDRX mode.",
    "4. The method of claim 1, wherein the modifying the one or more parameters comprises disabling SPS for the UE.",
    "5. The method of claim 1, wherein the modifying the one or more parameters comprises increasing frequency of grants in the SPS for the UE.",
    "6. The method of claim 1, wherein modifying the one or more parameters comprises assigning one or more uplink grants to the UE before sending a handover command to the UE.",
    "7. An apparatus for performing handover, comprising: a memory storing one or more of connected mode discontinuous reception (CDRX) parameters or semi-persistent scheduling (SPS) parameters for a user equipment (UE); at least one processor coupled to the memory and configured to: communicate with the UE to provide wireless network access to the UE; determine to handover the UE to a target base station; determine, based at least in part on evaluating one or more parameters including the one or more of CDRX parameters or SPS parameters with the UE, whether the UE is in a data call prior to the handover, wherein the data call is at least one of a voice over internet protocol (VoIP) call or a VoIP over long term evolution (VoLTE) call; and modify the parameters with the UE based on determining to handover the UE and determining that the UE is in the data call.",
    "8. The apparatus of claim 7, wherein the modifying the one or more parameters comprises disabling a CDRX mode with the UE.",
    "9. The apparatus of claim 7, wherein the modifying the one or more parameters comprises adjusting an OFF duration of the CDRX mode.",
    "10. The apparatus of claim 7, wherein the modifying the one or more parameters comprises disabling SPS for the UE.",
    "11. The apparatus of claim 7, wherein the modifying the one or more parameters comprises increasing frequency of grants in the SPS for the UE.",
    "12. The apparatus of claim 7, wherein to modify the one or more parameters comprises, the processor assigns one or more uplink grants to the UE before sending a handover command to the UE.",
    "13. An apparatus for performing handover, comprising: means for communicating with a user equipment (UE) to provide wireless network access to the UE; means for determining to handover the UE to a target base station; means for determining, based at least in part on evaluating one or more parameters including one or more of connected mode discontinuous reception (CDRX) parameters or semi-persistent scheduling (SPS) parameters with the UE, whether the UE is in a data call prior to the handover, wherein the data call is at least one of a voice over internet protocol (VoIP) call or a VoIP over long term evolution (VoLTE) call; and means for modifying the one or more parameters with the UE based on determining to handover the UE and determining that the UE is in the data call.",
    "14. The apparatus of claim 13, wherein the modifying the one or more parameters comprises disabling a CDRX mode with the UE.",
    "15. The apparatus of claim 13, wherein the modifying the one or more parameters comprises adjusting an OFF duration of the CDRX mode.",
    "16. The apparatus of claim 13, wherein the modifying the one or more parameters comprises disabling SPS for the UE.",
    "17. The apparatus of claim 13, wherein the modifying the one or more parameters comprises increasing frequency of grants in the SPS for the UE.",
    "18. The apparatus of claim 13, wherein modifying the one or more parameters comprises assigning one or more uplink grants to the UE before sending a handover command to the UE.",
    "19. A non-transitory computer-readable storage medium comprising computer-executable code for performing handover, comprising: code for communicating, by a serving base station, with a user equipment (UE) to provide wireless network access to the UE; code for determining, by the serving base station, to handover the UE to a target base station; code for determining, by the serving base station and based at least in part on evaluating one or more parameters including one or more of connected mode discontinuous reception (CDRX) parameters or semi-persistent scheduling (SPS) parameters with the UE, whether the UE is in a data call prior to the handover, wherein the data call is at least one of a voice over Internet protocol (VoIP) call or a VoIP over long term evolution (VoLTE) call; and code for modifying, by the serving base station, the one or more parameters with the UE based on determining to handover the UE and determining that the UE is in the data call.",
    "20. The non-transitory computer-readable storage medium of claim 19, wherein the code for modifying modifies the one or more parameters at least in part by disabling a CDRX mode with the UE.",
    "21. The non-transitory computer-readable storage medium of claim 19, wherein the code for modifying modifies the one or more parameters at least in part by adjusting an OFF duration of the CDRX mode.",
    "22. The non-transitory computer-readable storage medium of claim 19, wherein the code for modifying modifies the one or more parameters at least in part by disabling SPS for the UE.",
    "23. The non-transitory computer-readable storage medium of claim 19, wherein the code for modifying modifies the one or more parameters at least in part by increasing frequency of grants in the SPS for the UE.",
    "24. The non-transitory computer-readable storage medium of claim 19, wherein code for modifying modifies the one or more parameters at least in part by assigning one or more uplink grants to the UE before sending a handover command to the UE.",
    "25. A method for performing handover, comprising: receiving, by a target base station, handover of a user equipment (UE); determining, by the target base station, whether one or more memory buffers related to downlink or uplink traffic for the UE are cleared following the handover; and modifying, by the target base station, one or more of connected mode discontinuous reception (CDRX) and semi-persistent scheduling (SPS) parameters with the UE based on determining that the one or more memory buffers are cleared.",
    "26. The method of claim 25, wherein the modifying the one or more parameters comprises enabling the CDRX mode with the UE.",
    "27. The method of claim 25, wherein the modifying the one or more parameters comprises adjusting an OFF duration of CDRX mode with the UE.",
    "28. The method of claim 25, wherein the modifying the one or more parameters comprises enabling the SPS for the UE.",
    "29. The method of claim 25, wherein the modifying the one or more parameters comprises decreasing frequency of grants in the SPS for the UE.",
    "30. The method of claim 25, wherein the data call is based on voice over internet protocol (VoIP) or VoIP over long term evolution technology (VoLTE).",
    "31. An apparatus for performing handover, comprising: a memory storing one or more of connected mode discontinuous reception (CDRX) and semi-persistent scheduling (SPS) parameters for a user equipment (UE); at least one processor coupled to the memory and configured to: receive handover of a user equipment (UE); determine whether one or more memory buffers related to downlink or uplink traffic for the UE are cleared following the handover; and modify one or more of CDRX and SPS parameters with the UE based on determining that the one or more memory buffers are cleared.",
    "32. The apparatus of claim 31, wherein the modifying the one or more parameters comprises enabling the CDRX mode with the UE.",
    "33. The apparatus of claim 31, wherein the modifying the one or more parameters comprises adjusting an OFF duration of CDRX mode with the UE.",
    "34. The apparatus of claim 31, wherein the modifying the one or more parameters comprises enabling the SPS for the UE.",
    "35. The apparatus of claim 31, wherein the modifying the one or more parameters comprises decreasing frequency of grants in the SPS for the UE.",
    "36. The apparatus of claim 31, wherein the data call is based on voice over internet protocol (VoIP) or VoIP over long term evolution technology (VoLTE).",
    "37. An apparatus for performing handover, comprising: means for receiving handover of a user equipment (UE); means for determining whether one or more memory buffers related to downlink or uplink traffic for the UE are cleared following the handover; and means for modifying one or more of connected mode discontinuous reception (CDRX) and semi-persistent scheduling (SPS) parameters with the UE based on determining that the one or more memory buffers are cleared.",
    "38. The apparatus of claim 37, wherein the modifying the one or more parameters comprises enabling the CDRX mode with the UE.",
    "39. The apparatus of claim 37, wherein the modifying the one or more parameters comprises adjusting an OFF duration of CDRX mode with the UE.",
    "40. The apparatus of claim 37, wherein the modifying the one or more parameters comprises enabling the SPS for the UE.",
    "41. The apparatus of claim 37, wherein the modifying the one or more parameters comprises decreasing frequency of grants in the SPS for the UE.",
    "42. The apparatus of claim 37, wherein the data call is based on voice over internet protocol (VoIP) or VoIP over long term evolution technology (VoLTE).",
    "43. A non-transitory computer-readable storage medium comprising computer-executable code for performing handover, comprising: code for receiving handover of a user equipment (UE); code for determining whether one or more memory buffers related to downlink or uplink traffic for the UE are cleared following the handover; and code for modifying one or more of connected mode discontinuous reception (CDRX) and semi-persistent scheduling (SPS) parameters with the UE based on determining that the one or more memory buffers are cleared.",
    "44. The non-transitory computer-readable storage medium of claim 43, wherein the code for modifying modifies the one or more parameters at least in part by enabling the CDRX mode with the UE.",
    "45. The non-transitory computer-readable storage medium of claim 43, wherein the code for modifying modifies the one or more parameters at least in part by adjusting an OFF duration of CDRX mode with the UE.",
    "46. The non-transitory computer-readable storage medium of claim 43, wherein the code for modifying modifies the one or more parameters at least in part by enabling the SPS for the UE.",
    "47. The non-transitory computer-readable storage medium of claim 43, wherein the code for modifying modifies the one or more parameters at least in part by decreasing frequency of grants in the SPS for the UE.",
    "48. The non-transitory computer-readable storage medium of claim 43, wherein the data call is based on voice over internet protocol (VoIP) or VoIP over long term evolution technology (VoLTE)."
  ],
  "description_excerpt": "The present Application for Patent claims priority to Provisional Application No. 61/620,356 entitled “Apparatus and Method for Improving Device Handover During a Call” filed on Apr. 4, 2012, which is incorporated in the entirety by reference herein.\n\nField\n\nAspects of the present disclosure relate generally to wireless communication systems, and more particularly, to an apparatus and method for improving the performance of a user equipment handover during a data call.\n\nBackground\n\nWireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth and transmit power). Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, 3GPP Long Term Evolution (LTE) systems, and orthogonal frequency division multiple access (OFDMA) systems.\n\nGenerally, a wireless multiple-access communication system can simultaneously support communication for multiple user equipment devices (UE). Each UE communicates with one or more base stations, such as a Node B, evolved Node B (eNB), or other access point, via transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from the base stations to the UEs, and the reverse link (or uplink) refers to the communication link from the UEs to the base stations.",
  "cpc": [
    "H04W 36/0011",
    "H04W 36/0033",
    "H04W 52/0216",
    "H04W 72/042",
    "H04W 72/23",
    "H04W 76/048",
    "H04W 76/28",
    "Y02D 30/70"
  ],
  "ipc": [
    "H04W 36/00",
    "H04W 52/02"
  ],
  "assignees": [
    "Qualcomm Inc"
  ],
  "inventors": [
    "Shyamal Ramachandran",
    "Thomas Klingenbrunn",
    "Navid Ehsan",
    "Amir Aminzadeh Gohari",
    "Min Wang",
    "Srinivasan Balasubramanian"
  ],
  "filing_date": "2013-03-13",
  "publication_date": "2017-03-28",
  "grant_date": "2017-03-28",
  "priority_date": "2012-04-04",
  "application_number": "US-201313801602-A",
  "family_id": "49292253",
  "cited_by_count": 3,
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}