US20130281096A1 - Method and apparatus for communicating ism prone frequency information to a base station - Google Patents

Method and apparatus for communicating ism prone frequency information to a base station Download PDF

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Publication number
US20130281096A1
US20130281096A1 US13/978,485 US201213978485A US2013281096A1 US 20130281096 A1 US20130281096 A1 US 20130281096A1 US 201213978485 A US201213978485 A US 201213978485A US 2013281096 A1 US2013281096 A1 US 2013281096A1
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Prior art keywords
serving lte
ism
frequencies
lte frequencies
serving
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Sudhir Kumar Baghel
Venkateswara Rao Manepalli
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAGHEL, SUDHIR KUMAR, MANEPALLI, VENKATESWARA RAO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies

Definitions

  • the present invention relates to a wireless communication system. More particularly, the present invention relates to a method of handling in-device coexistence in a user equipment.
  • LTE Long Term Evolution
  • ISM Industrial, Scientific and Medical
  • GNSS Global Navigation Satellite Systems
  • a small form factor of the UE provides only 10-30 dB isolation.
  • the transmitter of one radio severely affects the receiver of another radio.
  • a small form factor of the UE may pose great challenge of in-device coexistence interference from transmission of ISM technology to the receiver of cellular technologies, such as LTE or Worldwide Interoperability for Microwave Access (WiMax®).
  • the transmitter of cellular technology may cause severe in-device coexistence interference to the ISM receiver.
  • the main cause of in-device co-existence issues may be because of receiver blocking due to a limited dynamic range of power amplifier, an Analog to Digital converter and out of band emission due to imperfect filtering.
  • FIG. 1A is a schematic diagram illustrating a separation between LTE and Bluetooth® channels according to the related art.
  • an LTE band 7 UL and Bluetooth® band are separated by 20 MHz frequency band.
  • the band 7 is Frequency Division Duplexing (FDD) band and hence the LTE receiver is not affected by the Bluetooth® transmitter whereas the LTE transmitter can affect the Bluetooth® receiver.
  • FDD Frequency Division Duplexing
  • TDD Time Division Duplexing
  • FIG. 1B is a schematic diagram illustrating a separation between LTE and Wi-Fi® channels according to the related art.
  • each channel is separated by 5 MHz with an exception of channel number 14, which is separated by 12 MHz.
  • Channel 1 starts with 2401 MHz and hence there is almost no separation between LTE band 40 and Wi-Fi®.
  • Channel 14 of Wi-Fi® ends at 2495 MHz, so theoretically only 5 MHz separation is available between the LTE band 7 and the Wi-Fi®.
  • Different countries have different policies for a number of allowed channels of the Wi-Fi®.
  • many countries allow only channel 1 to 13 whereas usage of channel number 14 is only allowed for an Institute of Electrical and Electronics Engineers (IEEE) 802.11b based communication. This suggests that even though in theory only 5 MHz separation is available between the Wi-Fi® and the LTE band 7 , at least 17 MHz is available in practice.
  • IEEE Institute of Electrical and Electronics Engineers
  • a UE is configured to report a presence of in-device coexistence interference between a serving LTE frequency of the LTE band and an ISM frequency of the ISM band to a base station. Accordingly, the base station decides to handover the UE to a different frequency not affected by an ISM activity or not affecting the ISM activity. Additionally, when the ISM activity has completed, the UE informs the same to the base station.
  • TDM Time Division Multiplexing
  • FDM Frequency Division Multiplexing
  • an aspect of the present invention is to provide a method of handling in-device coexistence in a User Equipment (UE).
  • UE User Equipment
  • FIG. 2 is a schematic diagram illustrating a ping pong scenario during handover of a User Equipment (UE) between an LTE frequency not affected by an ISM frequency and another LTE frequency affected by the ISM frequency according to an embodiment of the present invention.
  • UE User Equipment
  • a base station configures a UE with one or more non-serving Long Term Evolution (LTE) frequencies for performing measurements. The measurements are performed on these frequencies as the base station can handover the UE from the serving frequency to any of one or more non-serving LTE frequencies based on the measurements.
  • the target LTE frequency selected for handover may be affected by an Industrial, Scientific and Medical (ISM) activity.
  • ISM Industrial, Scientific and Medical
  • the base station performs handover to the target LTE frequency.
  • the base station performs handover of the UE to the target LTE frequency.
  • the UE may request the base station to move it away from the affected target LTE frequency. This may lead to a ping-pong effect between an LTE frequency affected by the ISM activity and an LTE frequency not affected by the ISM activity similar to the scenario illustrated in FIG. 2 .
  • a method in accordance with an aspect of the present invention, includes detecting a likelihood of in-device coexistence interference between at least one of non-serving LTE frequencies and an ISM frequency when an ISM activity is ongoing on the ISM frequency, and reporting the likelihood of in-device coexistence interference between the at least one of the non-serving LTE frequencies and the ISM frequency to a base station.
  • an apparatus in accordance with another aspect of the present invention, includes a processor, and a memory coupled to the processor, wherein the memory includes an interference handler configured to detect a likelihood of in-device coexistence interference between at least one of non-serving LTE frequencies and an ISM frequency when an ISM activity is ongoing on the ISM frequency, and configured to report the likelihood of in-device coexistence interference between the at least one of the non-serving LTE frequencies and the ISM frequency to a base station.
  • an interference handler configured to detect a likelihood of in-device coexistence interference between at least one of non-serving LTE frequencies and an ISM frequency when an ISM activity is ongoing on the ISM frequency, and configured to report the likelihood of in-device coexistence interference between the at least one of the non-serving LTE frequencies and the ISM frequency to a base station.
  • FIG. 1A is a schematic diagram illustrating a separation between Long Term Evolution (LTE) and Bluetooth® channels according to the related art.
  • LTE Long Term Evolution
  • FIG. 1B is a schematic diagram illustrating a separation between LTE and Wireless Fidelity (Wi-Fi®) channels according to the related art.
  • FIG. 2 is a schematic diagram illustrating a ping pong scenario during handover of a user equipment between an LTE frequency not affected by an Industrial, Scientific and Medical (ISM) frequency and another LTE frequency affected by the ISM frequency according to an embodiment of the present invention.
  • ISM Industrial, Scientific and Medical
  • FIG. 3 is a block diagram illustrating a wireless communication system capable of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 5 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 6 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 7 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 8 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 9 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 10 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • FIG. 11 illustrates a block diagram of a coordinator according to an embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating a wireless communication system capable of handling in-device co-existence interference between one or more non-serving Long Term Evolution (LTE) frequencies and an Industrial, Scientific and Medical (ISM) frequency configured for a user equipment according to an embodiment of the present invention.
  • LTE Long Term Evolution
  • ISM Industrial, Scientific and Medical
  • a wireless communication system 300 includes a User Equipment (UE) 301 and a base station (e.g., an evolved Node B (eNB)) 310 connected to the UE 301 via a wireless network (e.g., an LTE network) 312 .
  • the UE 301 includes an LTE module 302 , a coordinator 304 and an ISM module 304 .
  • the UE 301 is operating in the connected mode and performs uplink and downlink data transmission with the base station 310 over a serving LTE frequency.
  • the base station 310 configures non-serving LTE frequencies for the UE 301 to perform a measurement on the non-serving LTE frequencies. Thereafter, the base station 310 sends a list of the non-serving LTE frequencies to the UE 301 . Accordingly, the coordinator 304 configures the non-serving LTE frequencies for performing measurements in corresponding measurement gaps.
  • the coordinator 304 detects that there is a likelihood of in-device co-existence interference between one or more configured non-serving LTE frequencies and an ISM frequency on which an ISM activity is performed by the ISM module 306 .
  • the coordinator 304 reports that the ISM activity is ongoing and there is a likelihood of in-device coexistence interference between the one or more non-serving LTE frequencies and the ISM frequency to the base station 310 . Therefore, the base station 310 avoids performing handover of the UE 301 to the one or more serving LTE frequencies affected by the ISM frequency.
  • the base station 310 may communicate the likelihood of in-device coexistence interference to another base station with which the handover of the user equipment 301 is performed.
  • the ISM module 306 may be turned off upon completion of the ongoing ISM activity.
  • the coordinator 304 detects that the ISM module 306 is turned off and hence the coordinator 304 reports to the base station 310 that the ISM activity has completed and the ISM module 306 is turned off.
  • the coordinator 304 can reconfigure the one or more non-serving LTE frequencies for performing measurements.
  • the base station 310 may consider any of the one or more non-serving LTE frequencies for handover from the serving frequency from the user equipment 301 .
  • the base station 310 sets a timer value for which the one or more non-serving LTE frequencies are blocked for performing a measurement.
  • the base station 310 sends the timer value to the user equipment 301 .
  • the base station 310 sends an updated list of the non-serving LTE frequencies to the user equipment 301 upon expiry of the timer value, where the updated list includes the at least one of the non-serving LTE frequencies previously affected by the ISM activity. Accordingly, the user equipment 301 configures the non-serving LTE frequencies in the updated list for performing a measurement.
  • the user equipment 301 sets a timer value during which the at least one of the non-serving LTE frequencies is to be blocked for performing a measurement.
  • the UE 301 communicates the timer value to the base station 310 while reporting the likelihood of in-device coexistence interference between the at least one of the non-serving LTE frequencies and the ISM frequency to the base station.
  • the base station 310 sends an updated list of the non-serving LTE frequencies upon expiry of the timer value, where the updated list of the non-serving frequencies includes the at least one of the non-serving LTE frequencies. Accordingly, the user equipment 301 configures the non-serving LTE frequencies in the updated list for performing a measurement.
  • the UE 301 sets a timer value during which the at least one of non-serving LTE frequencies is to be blocked for performing a measurement. Further, the UE 301 adds the removed at least one of the non-serving LTE frequencies in the list of the non-serving LTE frequencies for performing measurements upon expiry of the timer value.
  • the expiry of the timer value indicates that the ISM activity has completed.
  • the expiry of timer value indicates that the one or more non-serving LTE frequencies are no more likely to be affected by the ISM activity as the ISM module 306 is turned off.
  • the UE 301 can perform measurements on the previously affected non-serving LTE frequencies and the base station 310 may consider any of the one or more non-serving LTE frequencies for handover from the serving frequency from the user equipment 301 upon expiry of the timer value (i.e., upon completion of the ISM activity).
  • FIG. 4 is a flowchart illustrating a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • a list of non-serving LTE frequencies to be configured for performing measurements is received from the base station 310 .
  • the non-serving LTE frequencies in the received list are configured by the user equipment 301 .
  • the controller 304 determines that the ISM module 306 is switched on for performing ISM activity on an ISM frequency.
  • the UE detects a likelihood of in-device co-existence interference between one or more of the non-serving LTE frequencies and the ISM frequency. Accordingly, at operation 408 , the likelihood of in-device co-existence interference between one or more non-serving LTE frequencies and the ISM frequency is reported to the base station.
  • a response message with an instruction to remove the one or more non-serving LTE frequencies from the list of configured non-serving LTE frequencies is received from the base station 310 .
  • the one or more non-serving LTE frequencies and corresponding measurement gaps are removed from the list of configured non-serving LTE frequencies by the user equipment 301 .
  • the one or more non-serving LTE frequencies and corresponding measurement gaps are automatically removed from the list by the user equipment 301 upon detecting the likelihood of in-device co-existence interference.
  • the one or more non-serving LTE frequencies are de-configured for performing measurements till the ISM activity is ongoing on the ISM frequency.
  • the user equipment 301 avoids performing measurements on the one or more non-serving LTE frequencies affected by the ongoing ISM activity in the measurement gaps.
  • the base station 310 avoids performing handover from the serving frequency to any of the one or more non-serving LTE frequencies by the ongoing ISM activity.
  • the user equipment 301 informs the base station 310 that the ISM activity is complete and there is no likelihood of in-device co-existence interference between the one or more non-serving LTE frequencies and the ISM frequency.
  • the user equipment 301 can reconfigure the one or more non-serving LTE frequencies for performing measurements.
  • the base station 310 may consider any of the one or more non-serving LTE frequencies for handover from the serving frequency based on the measurement report from the user equipment 301 .
  • FIG. 5 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • the base station 310 configures non-serving LTE frequencies for performing a measurement.
  • the base station 310 sends a list of the non-serving LTE frequencies to the user equipment 301 .
  • the user equipment 301 configures the non-serving LTE frequencies for performing measurements in corresponding measurement gaps.
  • the user equipment 301 detects that there is a likelihood of in-device co-existence interference between one or more configured non-serving LTE frequencies and an ISM frequency on which an ISM activity is performed by the ISM module 306 .
  • the user equipment 301 reports that the ISM activity is ongoing and there is a likelihood of in-device coexistence interference between the one or more non-serving LTE frequencies and the ISM frequency to the base station 310 in a measurement report or any other new message.
  • the UE 301 sends a measurement report indicating that there is a likelihood of in-device co-existence interference upon availability of measurement results or may send the indication through a new message upon detection of the likelihood of in-device co-existence interference.
  • the base station 310 avoids performing handover of the user equipment 301 to the one or more serving LTE frequencies affected by the ISM frequency.
  • the base station 310 may communicate the likelihood of in-device coexistence interference to another base station with which the handover of the user equipment 301 is performed. Further, if there are any measurement gaps for performing the measurement, the UE 301 and the base station 310 may continue or discontinue with the measurement gaps by communicating synchronously with the base station 310 . For example, the UE 301 may send such information as part of the measurement report if the non-serving LTE frequencies affected by the ISM activity are observed to be stronger.
  • the ISM module 306 is turned off when the ongoing ISM activity is complete.
  • the user equipment 301 detects that the ISM module 306 is turned off.
  • the user equipment 301 reports to the base station 310 that the ISM activity is complete and the ISM module 306 is turned off.
  • the user equipment 301 can reconfigure the one or more non-serving LTE frequencies for performing measurements.
  • the base station 310 may consider any of the one or more non-serving LTE frequencies for handover from the serving frequency based on the measurement report from the user equipment 301 .
  • FIG. 6 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • the base station 310 configures non-serving LTE frequencies for performing a measurement.
  • the base station 310 sends a Radio Resource Connection (RRC) reconfiguration message with a list of the non-serving LTE frequencies to the user equipment 301 .
  • RRC Radio Resource Connection
  • the user equipment 301 configures the non-serving LTE frequencies listed in the RRC reconfiguration message for performing measurements in corresponding measurement gaps.
  • the user equipment 301 detects that there is a likelihood of in-device co-existence interference between one or more configured non-serving LTE frequencies and an ISM frequency on which an ISM activity is performed by the ISM module 306 .
  • the user equipment 301 reports that the ISM activity is ongoing and there is a likelihood of in-device coexistence interference between the one or more non-serving LTE frequencies and the ISM frequency to the base station 310 in a measurement report.
  • the base station 310 sends a measurement reconfiguration message with an instruction to remove the one or more non-serving LTE frequencies from the list of non-serving LTE frequencies configured for performing a measurement.
  • the user equipment 301 removes the one or more non-serving LTE frequencies from the list of configured non-serving LTE frequencies based on the measurement reconfiguration message.
  • the ISM module 306 is turned off when the ongoing ISM activity is complete.
  • the user equipment 301 detects that the ISM module 306 is turned off.
  • the user equipment 301 reports to the base station 310 that the ISM activity is complete and the ISM module 306 is turned off.
  • the user equipment 301 can reconfigure the one or more non-serving LTE frequencies for performing measurements.
  • the base station 310 may consider any of the one or more non-serving LTE frequencies for handover from the serving frequency based on the measurement report from the user equipment 301 .
  • FIG. 7 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • the base station 310 configures non-serving LTE frequencies for performing a measurement.
  • the base station 310 sends an RRC reconfiguration message with a list of non-serving LTE frequencies to the user equipment 301 .
  • the user equipment 301 configures the non-serving LTE frequencies listed in the RRC reconfiguration message for performing measurements in corresponding measurement gaps.
  • the user equipment 301 detects that there is a likelihood of in-device co-existence interference between one or more configured non-serving LTE frequencies and an ISM frequency on which an ISM activity is performed by the ISM module 306 .
  • the user equipment 301 sends an RRC reconfiguration complete message indicating that the ISM activity is ongoing and there is a likelihood of in-device coexistence interference between the one or more non-serving LTE frequencies and the ISM frequency to the base station 310 .
  • the RRC reconfiguration message includes a new rejection cause indicating that one or more non-serving LTE frequencies are affected by the ISM activity and an information element indicating a list of one or more non-serving LTE frequencies affected by the ISM activity.
  • the base station 310 sends a new RRC reconfiguration message with an updated list of non-serving LTE frequencies.
  • the updated list of non-serving LTE frequencies excludes the one or more non-serving LTE frequencies that are affected by the ongoing ISM activity.
  • the user equipment 301 configures the non-serving LTE frequencies from the updated list of non-serving LTE frequencies for performing a measurement.
  • FIG. 8 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • the base station 310 configures non-serving LTE frequencies for performing a measurement.
  • the base station 310 sends an RRC reconfiguration message with a list of non-serving LTE frequencies to the user equipment 301 .
  • the user equipment 301 configures the non-serving LTE frequencies listed in the RRC reconfiguration message for performing measurements in corresponding measurement gaps.
  • the user equipment 301 detects that there is a likelihood of in-device co-existence interference between one or more configured non-serving LTE frequencies and an ISM frequency on which an ISM activity is performed by the ISM module 306 .
  • the user equipment 301 sends an RRC reconfiguration complete message indicating that the ISM activity is ongoing and there is a likelihood of in-device coexistence interference between the one or more non-serving LTE frequencies and the ISM frequency to the base station 310 .
  • the RRC reconfiguration message includes a new rejection cause indicating that one or more non-serving LTE frequencies are affected by the ISM activity and an information element indicating a list of one or more non-serving LTE frequencies affected by the ISM activity.
  • the RRC reconfiguration is rejected by the UE 301 , the connection between the base station 310 and the UE 301 is maintained and hence no connection re-establishment needs to be performed.
  • the user equipment 301 removes the one or more non-serving LTE frequencies and corresponding measurement gaps from the list of configured non-serving LTE frequencies. It can be noted that the UE 301 may continue to perform measurements on other non-serving LTE frequencies that are not affected by the ISM activity.
  • FIG. 9 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • the base station 310 configures non-serving LTE frequencies for performing a measurement.
  • the base station 310 sends an RRC reconfiguration message with a handover command for performing a handover from the serving LTE frequency to a configured non-serving LTE frequency.
  • the user equipment 301 detects that there is a likelihood of in-device co-existence interference between the non-serving LTE frequency and an ISM frequency on which an ISM activity is performed by the ISM module 306 .
  • the user equipment 301 rejects the handover command in the RRC reconfiguration message.
  • the user equipment 301 sends an RRC reconfiguration complete message to the base station 310 indicating that the ISM activity is ongoing and there is a likelihood of in-device coexistence interference between the non-serving LTE frequency and the ISM frequency.
  • the RRC reconfiguration message includes a new rejection cause indicating that the target non-serving LTE frequency is affected by the ISM activity.
  • the base station 310 sends a new RRC reconfiguration message with a handover command for performing handover from the serving LTE frequency to another non-serving LTE frequency not affected by the ongoing ISM activity.
  • the RRC connection needs to be re-established.
  • a source cell may not be listening to any subsequent message transmitted by the UE 301 .
  • a success may be received by a target cell or a failure, which needs a connection re-establishment, may be received by a target cell.
  • FIG. 10 is a flow diagram of a method of handling in-device co-existence interference between one or more non-serving LTE frequencies and an ISM frequency configured for a user equipment according to an embodiment of the present invention.
  • the base station 310 configures non-serving LTE frequencies for performing a measurement.
  • the base station 310 sends an RRC reconfiguration message with a handover command for performing a handover from the serving LTE frequency to a configured non-serving LTE frequency.
  • the user equipment 301 detects that there is a likelihood of in-device co-existence interference between the non-serving LTE frequency and an ISM frequency on which an ISM activity is performed by the ISM module 306 .
  • the user equipment 301 rejects the handover command in the RRC reconfiguration message.
  • the user equipment 301 triggers an RRC re-establishment procedure for re-establishing a radio resource connection with the base station 310 .
  • the user equipment 301 sends an RRC re-establishment request message to the base station 310 indicating that the ISM activity is ongoing and there is a likelihood of in-device coexistence interference between the non-serving LTE frequency and the ISM frequency.
  • the RRC re-establishment request message includes a new rejection cause indicating that the RRC re-establishment procedure is triggered since the target non-serving LTE frequency is affected by the ISM activity.
  • FIG. 11 illustrates a block diagram of a coordinator according to an embodiment of the present invention.
  • a coordinator 304 includes a processor 1102 , a memory 1104 , a Read Only Memory (ROM) 1106 , a bus 1108 , and a communication interface 1110 .
  • ROM Read Only Memory
  • the processor 1102 means any type of computational circuit, such as, but not limited to, a microprocessor, a microcontroller, a complex instruction set computing microprocessor, a reduced instruction set computing microprocessor, a very long instruction word microprocessor, an explicitly parallel instruction computing microprocessor, a graphics processor, a digital signal processor, or any other type of processing circuit.
  • the processor 1102 may also include embedded controllers, such as generic or programmable logic devices or arrays, application specific integrated circuits, single-chip computers, smart cards, and the like.
  • the memory 1104 may be a volatile memory and a non-volatile memory.
  • the memory 1104 includes an interference handler 1112 for handling in-device co-existence interference between non-serving LTE frequencies and an ISM frequency, according to the embodiments illustrated in FIGS. 3 and 10 .
  • a variety of computer-readable storage media may be stored in and accessed from the memory elements.
  • Memory elements may include any suitable memory device(s) for storing data and machine-readable instructions, such as a ROM, a Random Access Memory (RAM), an erasable programmable ROM, an electrically erasable programmable ROM, a hard drive, a removable media drive for handling memory cards, Memory SticksTM, and the like.
  • Embodiments of the present subject matter may be implemented in conjunction with modules, including functions, procedures, data structures, and application programs, for performing tasks, or defining abstract data types or low-level hardware contexts.
  • Machine-readable instructions stored on any of the above-mentioned storage media may be executable by the processor 1102 .
  • a computer program may include machine-readable instructions capable of handling in-device co-existence interference between non-serving LTE frequencies and an ISM frequency, according to the teachings and herein described embodiments of the present subject matter.
  • the computer program may be included on a storage medium and loaded from the storage medium to a hard drive in the non-volatile memory.
  • the UE 301 starts measurements on the neighboring inter frequency cells (e.g., the non-serving LTE frequencies) when the signal quality of the serving cell falls below a threshold since the base station 310 requires some measurements from the UE 301 on the neighboring inter frequency cells in order to make a handover. Therefore, if the ISM activity is complete, the UE 301 triggers a request for configuring the at least one of non-serving LTE frequency for performing measurements. In response, the UE 301 receives an updated list of non-serving LTE frequencies from the base station 310 , wherein the updated list of non-serving frequencies includes the at least one of the non-serving LTE frequencies. Accordingly, the UE 301 configures the non-serving LTE frequencies in the updated list of non-serving LTE frequencies for performing a measurement.
  • the neighboring inter frequency cells e.g., the non-serving LTE frequencies
  • the UE 301 may send a request to the base station 310 for configuring the blocked non-serving LTE frequencies for performing a measurement or be made as a serving frequency. For example, the UE 301 may communicate the request to the base station 310 either using a new cause and/or an information element in the connection reconfiguration complete message.
  • the UE 301 can send an indication to the base station 310 that the blocked non-serving LTE frequencies are re-configured for performing a measurement.
  • the UEs In an idle mode, the UEs typically perform cell reselections to keep themselves connected to the base station 310 , receive paging, read the system information, and the like.
  • the decision to perform cell reselection is based on serving a cell signal strength, ranking with the neighbor and network provided cell reselection priorities. Because of the network provided reselection priorities, the UE 301 may be forced to reselect to an LTE frequency affected by the ISM activity, thereby leading to problems in subsequent connection and triggering Frequency Division Multiplexing (FDM) based solutions.
  • FDM Frequency Division Multiplexing
  • the UE 301 performs reselection procedure on an LTE frequency which is not interfered by the ISM activity as the UE 301 considers the priority of interfering or interfered LTE frequencies to be lower than any of the priorities given by the network even if the network has signaled it to be a high priority. This is advantageous as if more than one frequency is available for reselection. The above rule prioritizes the non-interfered frequencies. Further, if only the affected LTE frequency is available for reselection, the cell reselection procedures make sure that this LTE frequency is only reselected if the serving cell is having a low signal strength.
  • the UE 301 is forced to re-select a frequency which is not interfered by the ISM activity as the UE 301 considers priorities of the interfering or interfered LTE frequencies to be lower than the priority of the serving LTE frequency, provided the UE 301 is given and is valid even if the network has signaled it to be a high priority.
  • the UE 301 When making a connection to the base station 310 , the UE 301 may be camped on an LTE frequency or the LTE frequency on which the UE 301 is attempting to make the connection establishment is affected by an ISM activity. In such a case, the UE 301 may to trigger an FDM based solution at the end of connection establishment. As the FDM solution requires a handoff to be triggered and the handoff may only happen with the measurements and after completion of the security procedures which involves a substantial delay. As a result, the connection may be dropped.
  • the UE 301 when the UE 301 is aware of ISM interference on the camped LTE frequency at the time of radio resource connection establishment, the UE 301 communicates a likelihood of in-device co-existence interference between the camped LTE frequency and the ISM frequency either in an RRC connection request message or an RRC connection setup complete message. Based on the indication, the base station 310 becomes aware that the camped LTE frequency is affected by the ISM frequency and the ISM module 306 is ON. Thus, the base station 310 can move the UE 301 to an LTE frequency which is not affected by the ISM frequency. The movement can be either by accelerating measurement and handover procedure or by releasing the connection by providing the necessary parameters in the release message, such as redirection and dedicated cell reselection priorities.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
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WO2012093901A3 (en) 2012-11-08
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AU2012204609B2 (en) 2016-03-24
JP5921573B2 (ja) 2016-05-24
US20200178094A1 (en) 2020-06-04
KR20140009289A (ko) 2014-01-22
EP2661922B1 (en) 2020-10-28
US10567982B2 (en) 2020-02-18
US11089493B2 (en) 2021-08-10
WO2012093901A2 (en) 2012-07-12
AU2012204609A1 (en) 2013-08-22
EP2661922A2 (en) 2013-11-13
CN103416087B (zh) 2016-11-02
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US20190230528A1 (en) 2019-07-25

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