WO2013168977A1 - Appareil et procédé pour régler le brouillage de coexistence intradispositif dans un système de télécommunication sans fil - Google Patents

Appareil et procédé pour régler le brouillage de coexistence intradispositif dans un système de télécommunication sans fil Download PDF

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Publication number
WO2013168977A1
WO2013168977A1 PCT/KR2013/003979 KR2013003979W WO2013168977A1 WO 2013168977 A1 WO2013168977 A1 WO 2013168977A1 KR 2013003979 W KR2013003979 W KR 2013003979W WO 2013168977 A1 WO2013168977 A1 WO 2013168977A1
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WIPO (PCT)
Prior art keywords
measurement
idc
frequency band
interference
cells
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PCT/KR2013/003979
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English (en)
Inventor
Jae Hyun Ahn
Ki Bum Kwon
Kang Suk Huh
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Pantech Co., Ltd.
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Publication of WO2013168977A1 publication Critical patent/WO2013168977A1/fr

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    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to an apparatus and method for controlling In-Device Coexistence (IDC) interference in a wireless communication system.
  • IDC In-Device Coexistence
  • a wireless communication system uses one bandwidth for data transmission.
  • a 2 nd generation wireless communication system uses a bandwidth of 200 KHz to 1.25 MHz
  • a 3 rd generation wireless communication system uses a bandwidth of 5 MHz to 10 MHz.
  • the bandwidth of a recent 3 rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) or Institute of Electrical and Electronics Engineers (IEEE) 802.16m continues to extend up to 20 MHz or higher.
  • 3GPP 3 rd Generation Partnership Project
  • LTE Long Term Evolution
  • IEEE Institute of Electrical and Electronics Engineers 802.16m
  • a multiple component carrier system in which a carrier having one bandwidth and a center frequency is defined and data can be transmitted or received through a plurality of the carriers using a wide band.
  • a multiple component carrier system supports both a narrow band and a wide band by using one or more carriers. For example, if one carrier corresponds to a bandwidth of 5 MHz, a maximum of a 20 MHz bandwidth is supported by using four carriers.
  • a user who performs communication with one network system through one terminal carries different devices supporting respective network systems.
  • a user can perform communication with a plurality of network systems using only one terminal simultaneously, thereby increasing user convenience.
  • IDC interference means interference in which transmission in one frequency band interferes with reception in the other frequency band within the same terminal. For example, if one terminal supports a Bluetooth system and an 802.16 system at the same time, IDC interference can be generated between a Bluetooth system band and an 802.16 system band. IDC interference can be commonly generated when an interval between the frequency band boundaries of different network systems is not sufficient wide.
  • the present invention provides an apparatus and method for controlling IDC interference.
  • the present invention also provides a method and apparatus for transmitting information that supports IDC interference coordination.
  • the present invention also provides a method and apparatus for providing an available measurement result that supports IDC interference coordination.
  • the present invention also provides a method and apparatus for performing measurement for IDC interference coordination.
  • the present invention also provides a method and apparatus for configuring measurement for IDC interference coordination.
  • a method of User Equipment (UE) performing In-Device Coexistence (IDC) interference coordination in a wireless communication system comprises receiving a Radio Resource Control (RRC) connection reconfiguration message comprising a measurement configuration that is a frequency configuration for measurement, performing measurement on neighbor cells when a measurement result for a primary serving cell is greater than or equal to a specific reference value in relation to all frequency bands configured according to the measurement configuration and transmitting a measurement result report, comprising a measurement result obtained by removing an influence of IDC interference from a measurement sample on which the measurement has been performed, to a Base Station (BS).
  • RRC Radio Resource Control
  • IDC interference generated in a frequency band whose measurement configuration has been set up, but which is not related to a serving cell can be controlled. Furthermore, a measurement result value included in assistant information can be derived.
  • FIG. 1 illustrates a wireless communication system according to exemplary embodiments of the present invention.
  • FIG. 2 is an explanatory diagram describing in-device coexistence interference.
  • FIG. 3 is an example illustrating the in-device coexistence interference from an industrial, scientific and medical (ISM) transmitter to an LTE receiver.
  • ISM industrial, scientific and medical
  • FIG. 4 is an example in which a band is divided into an ISM band and an LTE band on a frequency band.
  • FIG. 5 is an explanatory diagram illustrating one example of alleviating the in-device coexistence interference by using an FDM scheme according to the present invention.
  • FIG. 6 is an explanatory diagram illustrating another example of alleviating the in-device coexistence interference by using the FDM scheme according to the present invention.
  • FIGS. 7 and 8 are explanatory diagrams illustrating one example of alleviating the in-device coexistence interference by using a power control (PC) scheme according to the present invention.
  • PC power control
  • FIG. 9 is an explanatory diagram illustrating one example of alleviating the in-device coexistence interference according to the present invention.
  • FIG 10 is an explanatory diagram illustrating one example of transmission/reception timings on time axes in the LTE band and the ISM band using the TDM scheme according to the present invention.
  • FIG. 11 is a diagram illustrating another example of alleviating the in-device coexistence interference according to the present invention.
  • FIG. 12 is a diagram illustrating yet another example of alleviating the in-device coexistence interference according to the present invention.
  • FIG. 13 is a diagram illustrating yet another example of alleviating the in-device coexistence interference according to the present invention.
  • FIGS. 14 and 15 show an example of a DRX operation according to the present invention.
  • FIG. 16 shows cases where the terminal receives an in-device interference signal.
  • FIG. 17 is a flowchart illustrating an example of IDC interference coordination between a BS and UE in accordance with the present invention.
  • FIG. 18 is a diagram illustrating that an available measurement result is configured based on a measurement configuration in accordance with the present invention.
  • FIG. 19 is a diagram illustrating an example of a method of obtaining a measurement value from which the influence of IDC interference has been removed in accordance with the present invention.
  • FIG. 20 is a diagram illustrating another example of a method of obtaining a measurement value from which the influence of IDC interference has been removed in accordance with the present invention.
  • FIG. 21 is a flowchart illustrating an example of the operation of UE which performs invention IDC interference coordination in accordance with the present.
  • FIG. 22 is a flowchart illustrating the operation of a BS which performs IDC interference coordination in accordance with the present invention.
  • FIG. 23 is a block diagram of UE 2300 and a BS 2350 which perform IDC interference coordination in accordance with the present invention.
  • FIG. 1 illustrates a wireless communication system according to exemplary embodiments of the present invention.
  • the wireless communication system is widely placed in order to provide various communication services including voice, packet, data, and the like, and includes a terminal (also may called as a user equipment (UE)) 10, a base station (called as a evolved NodeB (eNB) or BS) 20, a wireless LAN access point (AP) 30, a global positioning system (GPS) 40, and a satellite.
  • a terminal also may called as a user equipment (UE)
  • UE user equipment
  • eNB evolved NodeB
  • AP wireless LAN access point
  • GPS global positioning system
  • a wireless LAN is a device supporting IEEE 802.11 technology which a wireless standard and the IEEE 802.11 may be mixed with a WiFi system.
  • the UE 10 may be positioned in coverage of a plurality of networks including a cellular network, a wireless LAN broadcast network, a satellite system, and the like.
  • the UE 10 is provided with a plurality of wireless transceivers in order to access various networks and various services regardless of place and time.
  • a smart phone is provided with long term evolution (LTE), WiFi Bluetooth transceiver, and a GPS receiver.
  • LTE long term evolution
  • WiFi Bluetooth transceiver WiFi Bluetooth transceiver
  • GPS receiver GPS receiver
  • a downlink (DL) indicates communication from the eNB 20 and an uplink (UL) indicates communication from the UE 10 to the eNB 20.
  • a transmitter may be a part of the eNB 20 and a receiver may be a part of the UE 10.
  • the transmitter may be a part of the UE 10 and a receiver may be a part of the eNB 20.
  • the UE 10 may be fixed or have mobility, and may be called other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, and the like.
  • the eNB 20 indicates a fixed station that communicates with the UE 10 and may be called other terms such as a base station (BS), a base transceiver system (BTS), an access point, a femto base station (BS), a relay, and the like.
  • BS base station
  • BTS base transceiver system
  • BS femto base station
  • relay a relay
  • Multiple access techniques applied to the wireless communication system are not limited.
  • Various multiple access techniques such as CDMA(Code Division Multiple Access), TDMA(Time Division Multiple Access), FDMA(Frequency Division Multiple Access), OFDMA(Orthogonal Frequency Division Multiple Access), SC-FDMA(Single Carrier-FDMA), OFDM-FDMA, OFDM-TDMA, and OFDM-CDMA may be used.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-FDMA
  • FIG. 2 is an explanatory diagram describing in-device coexistence interference.
  • the UE 10 includes an LTE RF 11, a GPS RF 12, and a Bluetooth/WiFi RF 13.
  • Transceiving antennas 14, 15, and 16 are connected to the respective RFs. That is, various types of RFs are closely mounted in one device platform.
  • transmission power of one RF may be much larger than a reception power level into another RF receiver. In this case, if an interval in frequency between the RFs is not sufficient and a filtering technique is not supported, a transmission signal of any RF may cause remarkable interference in a receiver of another RF within the device.
  • 'A' is an example in which the transmission signal of the LTE RF 11 causes the in-device coexistence interference in the GPS RF 12 and the Bluetooth/WiFi RF 13 and 'B' is an example in which the transmission signal of the Bluetooth/WiFi RF 13 causes the in-device coexistence interference in the LTE RF 11.
  • FIG. 3 is an example illustrating the in-device coexistence interference from an industrial, scientific and medical (ISM) transmitter to an LTE receiver.
  • the ISM band indicates a band which may be arbitrarily used without authorizing the use in industrial, scientific, and medical fields.
  • a band of a signal received by the LTE receiver overlaps with a band of a transmission signal of the ISM transmitter.
  • the in-device coexistence interference may occur.
  • FIG. 4 is an example in which a band is divided into an ISM band and an LTE band on a frequency band.
  • a band 40, a band 7, and a band 38 are LTE bands.
  • the band 40 occupies a band in the range of 2300 to 2400 MHz in a TDD mode and the band 7 occupies a band in the range of 2500 to 2570 MHz as the uplink in an FDD mode.
  • the band 38 occupies a band in the range of 2570 to 2620 MHz in the TDD mode.
  • the ISM band is used as a WiFi channel and a Bluetooth channel, and occupies a band in the range of 2400 to 2483.5 MHz.
  • Table 1 a condition in which the in-device coexistence interference occurs is illustrated in Table 1 below.
  • a mark of 'a->b' in the interference pattern illustrates a condition in which a transmitter a causes the in-device coexistence interference to a receiver b.
  • the ISM transmitter causes the in-device coexistence interference to an LTE-band downlink TDD receiver (LTE DL TDD Rx).
  • LTE DL TDD Rx LTE-band downlink TDD receiver
  • the in-device coexistence interference may be alleviated to some extent by a filtering scheme, but is not sufficient to alleviate the in-device coexistence interference.
  • FDM frequency division multiplex
  • FIG. 5 is an explanatory diagram illustrating one example of alleviating the in-device coexistence interference by using an FDM scheme according to the present invention.
  • the LTE band may be moved so as to prevent the LTE band and the ISM band from overlapping with each other. As a result, a handover of the terminal is induced from the ISM band.
  • a method in which legacy measurement or new signaling accurately triggers a mobility procedure or a radio link failure (RLF) procedure is required.
  • a part which becomes a problem associated with the ISM in the LTE band may be avoided through a filtering or resource allocation technique.
  • overlapping interference may be avoided with respect to a case in which LTE carriers are compiled through a procedure of reconfiguring a set of used carriers.
  • FIG. 6 is an explanatory diagram illustrating another example of alleviating the in-device coexistence interference by using the FDM scheme according to the present invention.
  • the ISM band may be reduced and moved so as to be spaced apart from the LTE band.
  • backward compatibility problem may occur.
  • the backward compatibility problem may be resolved due to an adaptive frequency hopping mechanism to some extent, but in the case of the WiFi, it may be difficult to resolve the backward compatibility problem.
  • FIGS. 7 and 8 are explanatory diagrams illustrating one example of alleviating the in-device coexistence interference by using a power control (PC) scheme according to the present invention.
  • PC power control
  • the terminal avoids the in-device coexistence interference by lowering transmission power of the LTE signal by a predetermined level to improve reception quality of the ISM band and referring to FIG. 8, the terminal avoids the in-device coexistence interference by lowering transmission power of the ISM band by a predetermined level to improve reception quality of the LTE signal.
  • FIG. 9 is an explanatory diagram illustrating one example of alleviating the in-device coexistence interference according to the present invention.
  • the in-device coexistence interference may be avoided. For example, when the signal in the ISM band is transmitted at t 0 , the LTE signal is received at t 1 .
  • FIG 10 is an explanatory diagram illustrating one example of transmission/reception timings on time axes in the LTE band and the ISM band using the TDM scheme according to the present invention.
  • the in-device coexistence interference may be avoided without movement between the LTE band and the ISM band by using the scheme of FIG. 9.
  • FIG. 11 is a diagram illustrating another example of alleviating the in-device coexistence interference according to the present invention.
  • a predetermined pattern periodicity interval is divided into a scheduled period interval and an unscheduled period interval to avoid the in-device coexistence interference by the TDM scheme based on discontinuous reception (DRX).
  • DRX discontinuous reception
  • LTE Long Term Evolution
  • ISM Interoperability for Mobile communications
  • primary LTE transmission such as random access and hybrid automatic repeat request (HARQ) retransmission may be permitted even within the scheduled period interval.
  • HARQ hybrid automatic repeat request
  • the primary ISM transmission such as Beacon or WiFi may be permitted even within the scheduled period interval, similarly as the unscheduled period interval.
  • the LTE transmission may be prevented in order to protect the primary ISM transmission.
  • Special signaling for protecting the primary ISM transmission such as Beacon may be added.
  • a period of the Beacon signaling and information on a subframe offset may be added.
  • the subframe offset number and the system frame number may be determined based on '0'.
  • the system frame number may have one of '0' to '1023' by the unit of a radio frame in the LTE system.
  • One radio frame is constituted by ten subframes.
  • an accurate frame position may be known in the corresponding system.
  • the corresponding period or offset may be used as information to choose proper DRX period of DRX offset.
  • FIG. 12 is a diagram illustrating yet another example of alleviating the in-device coexistence interference according to the present invention.
  • a ticked part means that transmission or reception is approved and a part marked by 'X' means that transmission or reception is denied.
  • the terminal denies granting not to perform UL transmission in order to protect the reception of the ISM.
  • transmission of the ISM is denied in order to protect the reception of the LTE.
  • FIG. 13 is a diagram illustrating yet another example of alleviating the in-device coexistence interference according to the present invention.
  • transmission of the LTE subframe is partially denied based on a Physical Downlink Control Channel (PDCCH) in order to protect the reception of the ISM.
  • PDCCH Physical Downlink Control Channel
  • a UE denies ISM transmission when receiving PDCCH region of LTE.
  • the PDCCH region means a region combining a resource region including control information such as resource allocation or grant and a region needed to decode the control information.
  • PDCCH region means combining the number of OFDM symbol used for transmitting PDCCH which is transmitted by Physical Control Format Indicator Channel (PCFICH) and a region needed to decode PDCCH in the UE.
  • PCFICH Physical Control Format Indicator Channel
  • the size of the region needed to decode PDCCH in the UE may be changed based on the UE implementation, but may not be over one subframe.
  • ISM transmission may be denied.
  • a UE judges whether downlink resource allocation exists in non-PDCCH region (1305, 1315, 1325, 1335, 1345, 1355, 1365, 1375) which is indicated by each of PDCCH region(1300, 1310, 1320, 1330, 1340, 1350, 1360, 1370).
  • non-PDCCH region 1315, 1335, 1345, 1355
  • downlink resource allocation exists in non-PDCCH region.
  • non-PDCCH region (1305, 1325, 1365, 1375) downlink resource allocation is not existed in non-PDCCH region.
  • non-PDCCH region In some of non-PDCCH region, ISM transmission is partially denied. In others of non-PDCCH region (1305, 1325, 1365, 1375), ISM transmission is permitted.
  • FIGS. 14 and 15 show an example of a DRX operation according to the present invention.
  • a DRX cycle 1400 means a cycle in which the DRX operation is performed, and as one example, there is a long DRX cycle, which is applied in the range between 10 subframes to 2560 subframes, and as another example, there is a short DRX cycle, which is applied in the range of 2 subframes to 640 subframes.
  • the short DRX cycle is applied for the DRX operation only while a DRX short cycle timer (drxShortCycleTimer) operates, and in the range falling outside of the DRX short cycle timer, the long DRX cycle is applied.
  • the basic unit of the DRX short cycle timer is one short DRX cycle. That is, if the length of the short DRX cycle is 10, the time becomes "10*drxShortCycleTimer". At this time, the range of the length of the short DRX cycle is from 1 to 16.
  • the active time 1405 means the total time during which a terminal is awake to receive the PDCCH.
  • the active time means the time during which an on-duration timer 1415 of the terminal operates, or time which additionally includes time during which a timer, such as a DRX inactivity timer (drx-InactivityTimer) 1420, a DRX retransmission timer (drx-RetransmissionTimer) 1425, or a MAC contention resolution timer (mac-ContentionResolutionTimer) 1430, is operated.
  • a timer such as a DRX inactivity timer (drx-InactivityTimer) 1420, a DRX retransmission timer (drx-RetransmissionTimer) 1425, or a MAC contention resolution timer (mac-ContentionResolutionTimer) 1430.
  • a non-active time 1410 means time that is not the active time 1405 of the DRX cycle 1400.
  • the timer unit of the DRX timer such as the on-duration timer 1415, the DRX inactivity timer 1420, or the DRX retransmission timer 1425, is a PDCCH subframe (psf). That is, the DRX timer is signaled or operated in a PDCCH subframe.
  • the PDCCH subframe means a subframe that includes the PDCCH.
  • DL subframes and downlink pilot time slot (DwPTS) subframes correspond to PDCCH subframes.
  • the subframes that are configured with respect to a relay node (RN) but are not suspended correspond to the PDCCH subframes.
  • the active time 1505 is configured as long as a DRX command MAC CE (DRX command MAC Control Element) 1550 is not received, and if the DRX command MAC CE 1550 is received, the on-duration timer 1515 is stopped, and the non-active time 1510 is configured.
  • the length of the on-duration timer 1515 is in the range of psf1 to psf200, that is, in the range from one PDCCH subframe to 200 PDCCH-subframes.
  • the DRX inactivity timer starts when a PDCCH that indicates new transmission is received, and is stopped when the DRX command MAC CE is received.
  • the DRX retransmission timer starts when data decoding is not successfully performed in the corresponding HARQ procedure in a HARQ RTT (Round Trip Time). If a PDCCH that includes a grant message is received with respect to the corresponding process, the DRX retransmission timer is stopped.
  • CQI masking is configured by upper-layer signaling
  • transmission of CQI, PMI (Precoding Matrix Index), RI (Rank Indicator), or PTI (Precoding Type Indicator) is not permitted outside the operating range of the on-duration timer.
  • CQI masking is not configured, the transmission of CQI, PMI, RI, or PTI is permitted in the active time rather than the operating cycle of the on-duration timer. Even outside the operating range of the on-duration timer, the transmission of the CQI, PMI, RI, or PTI may be permitted during the operating cycle of another timer, or during the active time, which is determined by a scheduling request operation or a random access operation.
  • the DRX active time is configured until the corresponding scheduling request is solved in the situation in which the scheduling request is pending.
  • the situation in which the scheduling request is pending (or outstanding) means the state in which data to be transmitted from a terminal to an uplink exist, but since resources for the corresponding uplink transmission have not been granted, the data accumulate without being transmitted. Unless the corresponding resources are not properly granted, the corresponding pending state is maintained, and the DRX active time is also maintained. That is, in the situation in which the scheduling request is pending, even if the above-described timers have expired, the DRX active time is configured until the corresponding scheduling is solved.
  • a random access (RA) operation the DRX exerts no influence on the transmission of a preamble or on the reception of a random access response (RAR).
  • Msg3 which is a message that includes a C-RNTI MAC CE (Cell-Radio Network Temporary Identifier MAC Control Element) or a CCCH SDU (Common Control Channel Service Data Unit) and is transmitted through a UL-SCH (Uplink-Shared Channel)
  • UL-SCH Uplink-Shared Channel
  • the active time is extended until the PDCCH constructed by C-RNTI is newly received after the RAR is received. That is, the PDCCH indicating that new transmission is addressed to the C-RNTI of the terminal is received in the terminal after the RAR of the preamble is successfully received in the terminal.
  • In-device coexistence interference is occurring in a serving frequency band.
  • Latent in-device coexistence interference exists in a serving frequency band (in-device coexistence interference is not currently occurring).
  • In-device coexistence interference is occurring in a frequency band that is not the serving frequency band.
  • Latent in-device coexistence interference exists in a frequency band that is not the serving frequency band (in-device coexistence interference is not currently occurring).
  • Each scenario indicates the interference type and the interference state based on the frequency band. Since the unusable frequency is not related to whether the frequency band is the serving frequency band, scenario 1 and scenario 3 correspond to in-device coexistence interference.
  • FIG. 16 shows cases where the terminal receives an in-device interference signal. These cases are classified into seven cases based on the frequency of occurrence and strength or power of interference.
  • case 1 and case 2 correspond to a continuous pattern
  • case 3 and case 4 correspond to a bursty pattern
  • case 5 and case 6 correspond to a sparse pattern
  • case 7 corresponds to a nonexistent pattern.
  • case 1 case 3 and case 5 correspond to a very strong pattern
  • case 2 case 4 and case 6 correspond to an enough weak pattern
  • case 7 corresponds to a nonexistent pattern.
  • cases where it is determined that in-device coexistence interference of the terminal is occurring may be case 1 and case 3.
  • the cases are cases where the interference is continuous or bursty, and the strength of interference is very strong.
  • the terminal may determine that case 2, case 4, case 5, and case 6 in Table 2 correspond to the existence of latent in-device coexistence interference.
  • the terminal may determine that case 5, in which the strength of interference is very strong, corresponds to the existence of latent in-device coexistence interference.
  • handover or RRC configuration/reconfiguration is not impossible, but the terminal may perform the measurement.
  • FIG. 17 is a flowchart illustrating an example of IDC interference coordination between a BS and UE in accordance with the present invention.
  • the UE transmits UE capability information to the BS at step S1700.
  • the UE capability information may be transmitted through an RRC message.
  • the UE capability information includes information about IDC assistant information configuration capabilities or a frequency band having a possibility that IDC interference may be present (hereinafter referred to as an 'IDC-possible frequency band'). Furthermore, the UE capability information may also include information about an on-going IDC frequency band.
  • the IDC assistant information configuration capabilities are also called IDC capabilities.
  • the IDC assistant information configuration capabilities relate to whether or not the UE has capabilities to configure IDC assistant information and transmit the configured IDC assistant information to the BS (or whether or not the UE has a version (e.g., Release 9 or Release 10) capable of performing the function).
  • a version e.g., Release 9 or Release 10.
  • the IDC-possible frequency band refers to information about a frequency band that may be an unusable frequency band.
  • the unusable frequency band refers to a frequency band in which it is difficult to perform wireless communication because IDC interference is in progress (i.e., on-going IDC interference) in the corresponding frequency band.
  • UE whose Wi-Fi is turned off never generates IDC interference when performing LTE initial access.
  • a band 40 becomes a frequency band that may be an unusable frequency due to on-going IDC, and thus the band 40 is determined to be an IDC-possible frequency band.
  • the IDC-possible frequency band includes not only an on-going IDC frequency band, but also a frequency band in which an IDC problem may potentially occur (hereinafter referred to as a 'potential IDC-problematic frequency band') depending on UE equipment configuration. That is, the IDC-possible frequency band does not include a requisite that IDC interference has been generated when UE capability information is transmitted.
  • the IDC-possible frequency band may be indicated (or represented) by an E-UTRA Absolute Radio Frequency Channel Number (EARFCN).
  • E-UTRA Evolved-Universal Terrestrial Radio Access
  • the EARFCN is obtained by dividing an operating frequency band of Evolved-Universal Terrestrial Radio Access (E-UTRA) and then assigning numbers to the divided bands.
  • the UE capability information may include all the EARFCN values of an IDC-possible frequency band.
  • the UE capability information may include an EARFCN corresponding to a bound of an IDC-possible frequency band.
  • the bound may be an upper bound or a lower bound lower bound.
  • an indicator (called a bound type indicator) indicating whether the bound is an upper bound or a lower bound may be further included in the UE capability information and transmitted, or the type of the bound may be implicitly determined based on a number of an operating band to which an EARFCN corresponding to the bound belongs. For example, in relation to a band 7 and a band 41 having different operating band numbers and different duplexing methods, but having the same frequency band, the bound (or the type of the bound) may be determined based on an operating band number.
  • an operating band affected by a frequency band indicated by an EARFCN included in the UE capability information may be indicated.
  • the indication of the operating band refers to an indication for each operating band not for each frequency band. If the number of operating bands affected by the frequency band indicated by the EARFCN is plural, all the operating bands may be indicated.
  • a BS may determine that IDC assistant information does not need to be transmitted because there is no possibility that IDC interference may occur in UE. That is, the BS operates like in a case where IDC assistant information configuration capabilities are disabled (or not supported).
  • the UE capability information may include information about the kind and type of another communication system that may generate IDC interference within UE.
  • the kind of a communication system may be at least one of a Wireless LAN (WLAN), Bluetooth (BT), and a Global Navigation Satellite System (GNSS).
  • the type of a communication system may be at least one of a type in which the communication system is used for voice communication, a type according to streaming service, such as multimedia Video On Demand (VOD), and a type used for offload.
  • WLAN Wireless LAN
  • BT Bluetooth
  • GNSS Global Navigation Satellite System
  • VOD multimedia Video On Demand
  • the BS transmits an RRC connection reconfiguration message to the UE in order to perform an RRC connection reconfiguration at step S1705.
  • the BS may permit the transmission of IDC assistant information by the UE in an enable state (also called a possible state).
  • This is called IDC assistant information enable (or IDC assistant permit). That is, the BS permits the UE to transmit IDC assistant information about the occurrence of IDC interference. If IDC assistant information enable is not present, the transmission of IDC assistant information is not permitted.
  • IDC assistant information enable is not signaled by the BS although the UE transmits UE capability information to the BS.
  • a BS may perform a frequency configuration in which UE may perform measurement through an RRC connection reconfiguration. This is also called a measurement configuration.
  • the UE may perform IDC assistant information triggering and transmit IDC assistant information based on the measurement configuration. That is, the measurement configuration may be related to a frequency band in which IDC assistant information triggering is performed or an unusable frequency band within IDC assistant information.
  • a serving cell refers to a primary serving cell and one or more secondary serving cells
  • a listed cell refers to a list cell within a measurement object
  • a detected cell is a cell that is not a list cell within a measurement object, but is detected by UE in a carrier frequency indicated by the measurement object.
  • a black-listed cell refers to a cell excluded from a measurement report. The exclusion from the measurement report means that a measurement result for a corresponding cell is not evaluated and the measurement result is not reported.
  • the meaning that the measurement result is not evaluated includes that an operation for comparing the measurement result with a threshold for report triggering in response to the measurement is not performed.
  • the measurement object means an object that performs the measurement.
  • the corresponding object includes one carrier band (or carrier frequency) and also includes the measurement offset, the black list cell, the list cell, etc. of the corresponding carrier band.
  • UE measures a serving cell, list cells, and detected cells other than black list cells and reports the measurement.
  • the RRC connection reconfiguration message may include information about the configuration of the candidate frequency of IDC assistant information triggering.
  • the RRC connection reconfiguration message may also include information on which the BS configures IDC assistant information triggering in order to restrict the IDC assistant information triggering.
  • an IDC prohibition timer may be set in the UE based on the RRC connection reconfiguration in order to prevent frequent triggering attributable to frequently changed IDC interference. After detecting the occurrence of IDC interference and transmitting IDC information, the UE does not transmit IDC information to the BS although it detects the occurrence of IDC interference while the IDC prohibition timer operates. In this case, the UE may be prevented from frequently transferring IDC information according to the occurrence of IDC interference to the BS, and the waste of UL transmission resources may be prevented.
  • the UE may prohibit (or stop or block) the transmission of IDC assistant information for a specific time in response to the IDC prohibition timer.
  • the IDC prohibition timer may be controlled by a network (or the BS), and the length of the IDC prohibition timer may be transmitted to the UE through the RRC connection reconfiguration message.
  • the IDC prohibition timer may be differently set in each serving cell, and one IDC prohibition timer may be set in each UE. If one IDC prohibition timer is set in each UE, the same prohibition timer is set and used in all serving cells.
  • the UE After the step S1705, the UE performs IDC assistant information triggering (hereinafter called IDC triggering) based on an IDC triggering condition at step S1710. That is, the UE triggers the transmission of the IDC assistant information.
  • IDC triggering may be performed simultaneously with measurement, the measurement may be performed prior to the IDC triggering, or the IDC triggering may be performed prior to the measurement.
  • the IDC triggering may be performed based on whether or not IDC interference is in progress (i.e., on-going IDC) in the UE based on determination within the UE. That is, the IDC triggering condition may include whether or not the UE is in an on-going IDC interference state as described with reference to FIG. 16, and a criterion for determination thereof may include determination within the UE.
  • IDC triggering may be performed depending on the implementation of the UE.
  • the IDC triggering condition depending on the implementation of the UE may be determined based on a test case, IDC interference intensity and activity, a Packet Error Rate (PER), or a measurement result.
  • the IDC activity refers to an index indicating how often IDC interference is generated in time.
  • the IDC activity may be defined at a ratio of subframes in which IDC interference is not generated and subframes in which IDC interference is generated, and an example for implementing the IDC activity includes a scheme for calculating the mean value based on each subframe weight.
  • a frequency band in which IDC triggering is generated may be a frequency band linked to a serving cell (e.g., a primary serving cell or a secondary serving cell), from among frequency bands whose measurement has been configured through the RRC connection reconfiguration at step S1705.
  • a serving cell e.g., a primary serving cell or a secondary serving cell
  • a frequency band in which IDC triggering is generated may be a frequency band that has been configured for current corresponding UE, but is now not served in addition to a frequency band linked to a serving cell. For example, if EARFCN values of a frequency band whose measurement has been configured are 1, 2, 3, 4, and 5, an EARFCN value of a frequency band linked to a primary serving cell is 3, and EARFCN values of a frequency band linked to a secondary serving cell are 4 and 5, the frequency bands whose EARFCN values are 1 and 2 are frequency bands that are not being served.
  • the UE transmits a measurement result performed by the UE, together with the IDC assistant information, to the BS at step S1715.
  • the IDC assistant information is also called IDC indication information.
  • the IDC assistant information may include the measurement result.
  • the measurement result may be an available measurement result in accordance with the present invention.
  • the available measurement result refers to a result obtained by performing measurement on an available measurement frequency band based on an S-measurement method in an available measurement cell.
  • the S-measurement refers to measurement that is not performed in a neighbor cell when a measurement result of a primary serving cell is smaller than a specific reference value (also called an S-measurement reference value).
  • a measurement value compared with the S-measurement reference value is the RSRP of a primary serving cell.
  • the available measurement frequency band may include all frequency bands according to the measurement configuration received (e.g., received through the RRC connection reconfiguration message) from the BS.
  • Information about the available measurement frequency band may be transmitted through a measurement object.
  • a measurement value for all cells e.g., detected cells, list cells, and serving cells
  • all cells e.g., detected cells, list cells, and serving cells
  • a measurement value for serving cells in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • the best cell refers to a cell having the greatest measurement intensity in a corresponding frequency band.
  • a criterion for the measurement intensity may be RSRP or RSRQ.
  • a measurement value for a primary serving cell in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • a measurement report quantity included in the available measurement result may be RSRP and RSRQ for each cell, RSRP for each cell, or RSRQ for each cell.
  • the measurement report quantity may be RSRP.
  • the measurement report quantity may be RSRQ.
  • the measurement report quantity may be RSRP and RSRQ.
  • the measurement report quantity may be determined based on the IDC assistant information enable. That is, whether the measurement report quantity will be RSRP, RSRQ, or RSRP and RSRQ may be determined based on the IDC assistant information enable. That is, signaling regarding what quantity will be included, together with IDC assistant information enable signaling, may be additionally transmitted from the BS to the UE.
  • FIG. 18 is a diagram illustrating that an available measurement result is configured based on a measurement configuration in accordance with the present invention.
  • a measurement object 1800 that is transmitted from a BS to UE through a measurement configuration information element within an RRC connection reconfiguration message includes frequency bands f1 (1810), f2 (1820), f3 (1830), f4 (1840) whose measurement has been configured.
  • List cells configured in the frequency band f1 (1810) are Cell3 and Cell4, and a black list cell is Cell6. It is assumed that a cell detected by the UE is Cell5.
  • a list cell configured in the frequency band f2 (1820) is Cell7, and a black list cell is Cell9. It is assumed that a cell detected by the UE is Cell8.
  • List cells configured in the frequency band f3 (1830) are Cell10 and Cell11, and a black list cell is Cell13. It is assumed that a cell detected by the UE is Cell12.
  • a list cell configured in the frequency band f4 (1840) is Cell14, and a black list cell is Cell16. It is assumed that a cell detected by the UE is Cell15.
  • the UE receives services through a primary serving cell Cell1 and a secondary serving cell Cell2 irrespective of the available measurement frequency bands.
  • available measurement frequency bands in relation to an available measurement result are all the frequency bands f1, f2, f3, and f4 whose measurement has been configured.
  • available measurement cells may include, for example (1), all cells (i.e., the detected cells, the list cells, and the serving cells) other than the black list cells, from among the available measurement frequency bands.
  • the available measurement cells include the list cells Cell3 and Cell4 and the detected cell Cell5 for the frequency band f1, the list cell Cell7 and the detected cell Cell8 for the frequency band f2, the list cells Cell10 and Cell11 and the detected cell Cell12 for the frequency band f3, and the list cell Cell14 and the detected cell Cell15 for the frequency band f4, and the serving cells Cell1 and Cell2.
  • an available measurement cell may include, for another example (2), the serving cells and the best cell for the frequency band of each of the detected cells and the list cells other than the black list cells, from among the available measurement frequency bands. More particularly, the available measurement cells include the serving cells Cell1 and Cell2, the best cell Cell4 for the frequency band f1, the best cell Cell8 for the frequency band f2, and the best cell Cell12 for the frequency band f3, and the best cell Cell15 for the frequency band f4.
  • which cell is the best cell is only an example, and the best cell may be different in each frequency band.
  • an available measurement cell may include, for yet another example (3), the primary serving cell and the best cell for the frequency band of each of the detected cells and the list cells other than the black list cells, from among the available measurement frequency bands. More particularly, the available measurement cells include the primary serving cell Cell1, the best cell Cell4 for the frequency band f1, the best cell Cell8 for the frequency band f2, the best cell Cell12 for the frequency band f3, and the best cell Cell15 for the frequency band f4.
  • which cell is the best cell is only an example, and the best cell may be different in each frequency band.
  • the number of serving cells, from among cells for an available measurement frequency band may be one or more.
  • measurement performed by UE may be S-measurement.
  • a measurement result i.e., S-measurement result
  • a serving cell e.g., a secondary serving cell
  • available measurement neighbor cells refer to detected cells and list cells that are not serving cells and are not black list cells in available measurement frequency bands.
  • UE may neglect (or deny) an S-measurement rule set by a network autonomously. This may be called 'new S-measurement'. That is, when IDC interference is generated within UE (or when the UE becomes an on-going IDC state), the UE neglects a predetermined S-measurement rule and performs measurement on serving cells and available measurement neighbor cells in available measurement frequency bands.
  • the time when the UE neglects the predetermined S-measurement rule may be received through an RRC connection reconfiguration, through an RRC connection reconfiguration message, through additional signaling from a BS. That is, the BS may transmit information about new S-measurement to the UE through the RRC connection reconfiguration.
  • the time when the predetermined S-measurement rule is neglected may be defined depending on an implementation within the UE.
  • the measurement value included in the available measurement result may be a measurement value used to select an FDM-based IDC solution.
  • the measurement value included in the available measurement result may be a measurement value from which the influence of IDC interference has been removed.
  • FIG. 19 is a diagram illustrating an example of a method of obtaining a measurement value from which the influence of IDC interference has been removed in accordance with the present invention.
  • IDC interference is generated due to ISM transmitted in response to LTE DL received by UE.
  • IDC occurrence intervals 1900 are measurement samples that are removed in a filtering process of the UE deriving a measurement result from all measurement samples. The UE calculates a measurement value based on the remaining measurement samples other than the IDC occurrence intervals 1900.
  • the measurement value may be calculated according to Equation 1 below.
  • Equation 1 M n is the most recent measurement sample, F n is a measurement value to be reported through a measurement report, F n-1 is a measurement value reported through a previous measurement report, 'a' is 1/2(k/4), and 'k' is a filter coefficient used for filtering.
  • the measurement sample is a measurement value in a subframe unit and is a parameter necessary to derive the measurement result to be reported through a measurement report.
  • the measurement sample means a measurement value for a subframe that is selected from measurement values for all subframes received by UE according to a rule defined in a wireless system.
  • the measurement sample may be obtained in the physical layer of UE, and the filtering may be performed in the higher layer, for example, in a Radio Resource Control (RRC) of UE.
  • RRC Radio Resource Control
  • the measurement sample may be continuously obtained for each subframe, but may be discontinuously obtained under a condition defined in UE capabilities or a system. That is, after a lapse of some interval since one measurement sample is obtained, another measurement sample may be obtained. In this case, measurement samples for some subframes are not obtained.
  • the interval may be periodic or aperiodic.
  • UE may perform autonomous denial on a communication system that generates IDC interference. For example, in order to measure an LTE band, the transmission of ISM for a corresponding measurement sample may be autonomously denied.
  • ISM transmission power Like the autonomous denial method, a method of reducing ISM transmission power is also possible.
  • the influence of IDC interference may be reduced by significantly reducing transmission power.
  • a method of measuring the intensity of IDC interference for a measurement sample including the influence of IDC interference within UE and performing calculation by taking the measured intensity into consideration may be used. That is, in this method, only the amount of IDC interference is removed from a measurement sample including the influence of IDC interference.
  • Equation 2 a measurement sample including the influence of IDC interference in a serving cell or a neighbor cell that is obtained based on RSRQ is conceptually expressed as in Equation 2 below.
  • Equation 2 S is the intensity of a received signal through the serving cell, I is the intensity of an interference signal (e.g., inter-cell interference) that affects a system, N is the intensity of noise (e.g., thermal noise), and I' is the intensity of IDC interference.
  • a measurement sample means a relative ratio of the IDC interference of the received signal and the inter-cell interference.
  • a method of removing IDC interference from a measurement sample is expressed as in the following equation.
  • a value of I' may be calculated using a different method depending on an implementation within UE, and a measurement sample without the influence of I' may be obtained by removing the I' value.
  • a measurement sample without the influence of IDC interference with the IDC occurrence intervals 1900 in order to obtain a measurement sample without the influence of IDC interference with the IDC occurrence intervals 1900, if the number of measurement samples with the influence of IDC interference is smaller than a specific reference value, the influence of measurement samples including the influence of IDC interference may be removed by only average filtering.
  • a measurement sample without the influence of IDC interference may be obtained according to the Equation 2.
  • FIG. 20 is a diagram illustrating another example of a method of obtaining a measurement value from which the influence of IDC interference has been removed in accordance with the present invention.
  • UE obtains a measurement sample including the influence of IDC interference in a interval (i.e., first interval) in which IDC interference in a serving cell or a neighbor cell in which IDC interference is generated and obtains a measurement sample not including the influence of IDC interference in a interval (i.e., second interval) in which IDC interference is not generated. Furthermore, the UE obtains a measurement sample in the entire interval (i.e., third interval) not related to IDC interference in a serving cell or a neighbor cell in which IDC interference is not generated. Here, the UE may obtain a measurement sample in each subframe, some subframes, or a specific subframe in each interval.
  • the measurement sample including the influence of IDC interference in the first interval is a measurement sample into which the influence of interference, including the sum of IDC interference, inter-cell interference (e.g., the interference of a serving cell and a non-serving cell in the same channel and contiguous channel interference), and thermal noise, is taken into consideration.
  • the measurement sample not including the influence of IDC interference in the second interval is a measurement sample including only the influence of inter-cell interference or thermal noise.
  • a scheme for preventing the transmission of ISM regarding the measurement sample may be taken.
  • the scheme for preventing the transmission of ISM may include a scheme for reducing the transmission power of ISM to a very low level.
  • the very low level may correspond to a case where an LTE received signal versus the IDC interference intensity of ISM in an LTE reception terminal is very small, for example, about -20 dB.
  • the scheme for preventing the transmission of ISM may include another scheme for suspending the transmission of ISM or not transmitting ISM regarding a corresponding sample.
  • the transmission of ISM has been scheduled, but the transmission is suspended in time or may be denied by UE.
  • a measurement sample from which the influence of IDC interference has been removed in the entire interval may be obtained.
  • the measurement sample not including the influence of IDC interference refers to a measurement sample including only the influence of inter-cell interference or thermal noise.
  • two types of measurement samples may be obtained in a serving cell or a neighbor cell in which IDC interference is generated.
  • the two types of measurement samples include a measurement sample including the influence of IDC interference and a measurement sample from which the influence of IDC interference has been removed.
  • the measurement sample from which the influence of IDC interference has been removed refers to a measurement sample having a measurement value without the influence of interference by applying an interference removal scheme to the measurement sample.
  • An embodiment of the interference removal scheme may include a scheme for performing correction on the SINR value of a corresponding measurement sample by the intensity of ISM transmission power at an ISM transmission terminal.
  • a first network system refers to a network system that provides the influence of IDC interference when the IDC interference is generated.
  • a network system attached by interference may be called a second network system.
  • ISM is the second network system.
  • an LTE system is the second network system.
  • a measurement sample not including the influence of IDC interference in a serving cell or a neighbor cell that is obtained based on RSRQ is conceptually expressed as in Equation 4 below.
  • Equation 4 S is the intensity of a received signal through a neighbor cell in a second network system, I is the intensity of an interference signal (e.g., inter-cell interference) that affects the second network system, and N is the intensity of noise (e.g., thermal noise). That is, a measurement sample refers to a relative ratio of the interference of the received signal and noise.
  • I is the intensity of an interference signal (e.g., inter-cell interference) that affects the second network system
  • noise e.g., thermal noise
  • a measurement sample not including the influence of IDC interference in a serving cell or a neighbor cell that is obtained based on RSRP is conceptually expressed as in Equation 5.
  • Equation 5 S is the intensity of a received signal through a neighbor cell in a second network system. That is, a measurement sample refers to the intensity of the received signal in the neighbor cell in the second network system.
  • a measurement sample including the influence of IDC interference in a serving cell or a neighbor cell that is obtained based on RSRQ has been conceptually described with reference to Equation 5.
  • a measurement sample including the influence of IDC interference in a serving cell or a neighbor cell that is obtained based on RSRP is conceptually expressed as in Equation 6 below
  • I' is the intensity of IDC interference
  • a measurement sample refers to the intensity of an IDC signal in a serving cell.
  • S is the intensity of a received signal in a second network system. If only the influence of IDC interference is to be measured, I' will become a result value. If a value including IDC interference is to be measured, S+I' will becomes a result value. If a value from which IDC interference has been removed is to be removed, S will become a result value.
  • an entity that performs measurement may be one entity.
  • the number of entities that perform measurement may be plural.
  • an entity that performs measurement including IDC interference and an entity that performs measurement not including IDC interference may be independently present.
  • a measurement result may be used to determine that what IDC solution is more proper. For example, if a target cell for an FDM operation has poor channel quality, a BS may select a TDM solution in order to solve the IDC problem of a serving cell.
  • the IDC assistant information may include information about an unusable frequency band for an FDM-based IDC solution or information about a TDM pattern for a TDM-based IDC solution.
  • the IDC assistant information may be information about each of a TDM operation and an FDM operation or information about both the TDM operation and the FDM operation.
  • the information about each of the TDM operation and the FDM operation may be given priority between the TDM operation and the FDM operation, that is, IDC solutions, from a viewpoint of UE.
  • the IDC assistant information may include information about an unusable frequency band.
  • the unusable frequency band may include an on-going IDC frequency band or may include both a potential IDC-problematic frequency band and an on-going IDC frequency band.
  • the IDC assistant information may include all EARFCN values of an unusable frequency band.
  • the IDC assistant information may include an EARFCN corresponding to the bound of an unusable frequency band.
  • the bound may be an upper bound or a lower bound.
  • the IDC assistant information may include an EARFCN corresponding to a lower bound and indicate that a frequency band greater than the lower bound is an unusable frequency based on the EARFCN.
  • the IDC assistant information may include an EARFCN corresponding to an upper bound and indicate that a frequency band smaller than the upper bound is an unusable frequency based on the EARFCN.
  • an indicator i.e., a bound type indicator
  • the type of a bound may be implicitly determined based on a number of an operating band to which an EARFCN included in the IDC assistant information belongs.
  • the IDC assistant information may include an EARFCN, and the EARFCN may indicate that an operating band region itself in which the EARFCN is present is an unusable frequency band.
  • the IDC assistant information may indicate that all the operating bands are unusable frequency bands.
  • only a frequency band related to a frequency band configured by a measurement configuration, from among on-going IDC frequency bands, may be signaled. For example, if EARFCN values of a frequency configured by a measurement configuration are 1, 2, 3, 4, and 5 and an EARFCN value of an on-going IDC frequency band is smaller than or equal to 3 (i.e., an upper bound is 3), but is greater than or equal to 10 (i.e., a lower bound is 10), only the upper bound 3 is signaled. This is because the lower bound 10 exceeds a range of the frequency bands 1, 2, 3, 4, and 5 whose measurement has now been configured. For another example, all the EARFCN values 1, 2, and 3 not a bound may be signaled.
  • an indicator indicating that an on-going IDC state has started also called an 'IDC-entering indicator'
  • the BS may implicitly determine that the corresponding frequency band has entered an on-going IDC state.
  • the IDC assistant information may include information about a TDM pattern.
  • the TDM pattern may include a DRX period, DRX-active duration, or DRX period start offset value.
  • Values related to a DRX parameter for performing an IDC DRX operation may be recommended and transferred through the information about the TDM pattern. That is, the values include the DRX period, DRX-active duration (or duration timer), and DRX period start offset (or DRX subframe offset) values.
  • Information about one TDM pattern may be recommended for each UE and transmitted.
  • the information about the TDM pattern may be independently transmitted for each of frequency bands defined in unusable frequency bands. For example, if EARFCN values of a frequency band whose measurement has been configured are 1, 2, 3, 4, and 5 and an upper bound of the EARFCN value of a frequency band affected by on-going IDC interference is 3, EARFCN values of an unusable frequency band are 1, 2, and 3. DRX parameters for each of the unusable frequency bands are signaled. In order to perform the corresponding signaling, a relationship between a frequency band and a TDM pattern may be additionally signaled.
  • signaling indicative of the number of EARFCN values of an unusable frequency band may be added.
  • a total number of TDM patterns may be known through the number of EARFCN values of an unusable frequency band.
  • the TDM pattern may be mapped in increasing order of the EARFCN values of the unusable frequency band. For example, when 2, 3, 6, and 7 are signaled as the EARFCN values of an unusable frequency band and four types of TDM patterns (e.g., pattern 1, pattern 2, pattern 3, and pattern 4) are signaled, the TDM patterns are mapped to the EARFCN values 2, 3, 6, and 7, respectively, according to signaling arrangement order of the TDM patterns. That is, the pattern 1 is mapped to the EARFCN value 2, the pattern 2 is mapped to the EARFCN value 3, the pattern 3 is mapped to the EARFCN value 6, and the pattern 4 is mapped to the EARFCN value 7.
  • the EARFCN values of the unusable frequency band may be directly mapped to the respective TDM patterns. That is, when TDM patterns are signaled, EARFCN values corresponding to the respective TDM patterns are signaled at the same time.
  • a TDM pattern may be paired with an EARFCN value and signaled at the same time.
  • additional signaling for each EARFCN value is necessary.
  • the IDC assistant information may include information about the kind or type of a different communication system that may generate IDC interference.
  • the information about the kind of a different communication system may be any of a WLAN, BT, and GNSS.
  • the information about the type of a different communication system may be any of a voice communication type, a streaming service type, such as multimedia VOD, and an offload type.
  • the scope of the present invention is not limited to the kinds and types, and information about various kinds and types of a communication system may be included.
  • the BS selects the most appropriate IDC solution (or coordination scheme) based on the IDC assistant information received from the UE at step S1720.
  • the IDC solution may be an FDM operation or a TDM operation.
  • the FDM operation or TDM operation may be an operation according to the FIGS. 5 to 13. For example, when a problem occurs in a frequency band served by the BS, if it is determined that a useful frequency band is not problematic due to load balancing and handover is not greatly influenced based on the IDC assistant information (e.g., if the useful frequency band has a sufficient high RSRP or RSRQ value), the FDM operation may be performed. If not, the TDM operation may be performed in a serving cell.
  • the BS transmits an IDC solution order, including the IDC solution, to the UE so that an IDC solution operation is performed at step S1725.
  • the IDC solution order may be transmitted through an RRC connection reconfiguration message.
  • the IDC solution order may include the operation of an IDC prohibition timer for prohibiting the transmission of the IDC assistant information for a specific time.
  • a secondary serving cell may be changed (e.g., a problematic secondary serving cell is deleted) through a serving cell management operation or a handover procedure for changing a primary serving cell may be started.
  • a specific DRX pattern may be transmitted through an RRC connection reconfiguration message.
  • an indicator indicating that a specific DRX pattern is caused by IDC interference, together with the specific DRX pattern, may be transmitted through an RRC connection reconfiguration message.
  • the indicator is called a TDM IDC indicator. Measurement performed by the UE may be differently changed in response to an instruction of the TDM IDC indicator.
  • the IDC solution corresponds to a TDM operation
  • the retransmission of an HARQ in an LTE band may be denied for the handling of a beacon. That is, the start of an IDC solution order may be instructed through IDC assistant information.
  • an IDC solution order process (or IDC solution operation process) may be omitted.
  • FIG. 21 is a flowchart illustrating an example of the operation of UE which performs invention IDC interference coordination in accordance with the present.
  • the UE transmits UE capability information to a BS at step S2100.
  • the UE capability information may be transmitted through an RRC message.
  • the UE capability information includes information about IDC assistant information configuration capabilities or an IDC-possible frequency band.
  • the UE capability information may further include information about an on-going IDC frequency band.
  • the IDC-possible frequency band refers to information about a frequency band that may be an unusable frequency.
  • the IDC-possible frequency band includes a potential IDC-problematic frequency band depending on a UE equipment configuration in addition to an on-going IDC frequency band.
  • the potential IDC-problematic frequency band may be indicated by an EARFCN.
  • the UE receives an RRC connection reconfiguration message from the BS and performs an RRC connection reconfiguration.
  • the UE may receive IDC assistant information enable necessary to transmit IDC assistant information about the occurrence of IDC interference to the BS.
  • the UE may perform a measurement configuration, that is, a frequency configuration for performing measurement, through the RRC connection reconfiguration.
  • an IDC prohibition timer may be set in the UE based on the RRC connection reconfiguration.
  • the IDC prohibition timer may be controlled by a network (or BS), and the length of the IDC prohibition timer may be transmitted to the UE through the RRC connection reconfiguration message.
  • the UE After the step S2105, the UE performs IDC assistant information triggering based on an IDC triggering condition at step S2110.
  • the IDC triggering may be performed simultaneously with measurement, the measurement may be performed prior to the IDC triggering, or the IDC triggering may be performed prior to the measurement.
  • a frequency band in which the IDC triggering is generated may be a frequency band linked to a serving cell (e.g., primary serving cell or secondary serving cell), from among frequency bands whose measurement has been configured through an RRC connection reconfiguration.
  • a serving cell e.g., primary serving cell or secondary serving cell
  • a frequency band in which the IDC triggering is generated may be a frequency band whose measurement has been configured in the UE, but which is not served, in addition to a frequency band linked to a serving cell.
  • the UE transmits a measurement result, measured by the UE, to the BS along with IDC assistant information step S2115.
  • the IDC assistant information may include the measurement result.
  • the measurement result may be an available measurement result.
  • An available measurement frequency band may include all frequency bands according to a measurement configuration received (e.g., received through the RRC connection reconfiguration message) from the BS.
  • Information about the available measurement frequency band may be transmitted through a measurement object.
  • a measurement value for all cells e.g., detected cells, list cells, and serving cells
  • all cells e.g., detected cells, list cells, and serving cells
  • a measurement value for serving cells in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • a measurement value for a primary serving cell in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • a measurement report quantity included in the available measurement result may be RSRP and RSRQ for each cell, RSRP for each cell, or RSRQ for each cell.
  • the measurement report quantity may be determined based on the IDC assistant information enable. That is, whether the measurement report quantity will be RSRP, RSRQ, or RSRP and RSRQ may be determined based on the IDC assistant information enable.
  • the measurement performed by the UE may be S-measurement.
  • a measurement result i.e., S-measurement result
  • a serving cell e.g., a secondary serving cell
  • available measurement neighbor cells refer to detected cells and list cells that are not serving cells and are not black list cells in available measurement frequency bands.
  • UE may neglect (or deny) an S-measurement rule set by a network autonomously. That is, when IDC interference is generated within UE (or when the UE becomes an on-going IDC state), the UE neglects a predetermined S-measurement rule and performs measurement on serving cells and available measurement neighbor cells in available measurement frequency bands.
  • the time when the UE neglects the predetermined S-measurement rule may be received through an RRC connection reconfiguration, through an RRC connection reconfiguration message, through additional signaling from a BS. That is, the BS may transmit information about new S-measurement to the UE through the RRC connection reconfiguration.
  • the time when the predetermined S-measurement rule is neglected may be defined depending on an implementation within the UE.
  • the measurement value included in the available measurement result may be a measurement value used to select an FDM-based IDC solution.
  • the measurement value included in the available measurement result may be a measurement value from which the influence of IDC interference has been removed.
  • the IDC assistant information may include information about an unusable frequency band for an FDM-based IDC solution or information about a TDM pattern for a TDM-based IDC solution.
  • the IDC assistant information may include information about an unusable frequency band.
  • the unusable frequency band may mean an on-going IDC frequency band or may include a potential IDC-problematic frequency band in addition to an on-going IDC frequency band.
  • the IDC assistant information may include all EARFCN values of an unusable frequency band.
  • the IDC assistant information may include information about a TDM pattern.
  • the TDM pattern may include a DRX period, DRX-active duration, or DRX period start offset value.
  • Values related to a DRX parameter for performing an IDC DRX operation may be recommended and transferred through the information about a TDM pattern. That is, the values include the DRX period, DRX-active duration (or duration timer), and DRX period start offset (or DRX subframe offset) values.
  • Information about one TDM pattern may be recommended for each UE and transmitted.
  • signaling indicative of the number of EARFCN values of the unusable frequency band may be added.
  • a total number of TDM patterns may be known through the number of EARFCN values of the unusable frequency band.
  • the UE receives an IDC solution selected by the BS and performs an IDC solution operation at step S2120.
  • the IDC solution may be an FDM operation or a TDM operation.
  • the FDM operation or TDM operation may be an operation according to FIGS. 5 to 13. For example, when a problem occurs in a frequency band served by the BS, if it is determined that a useful frequency band is not problematic due to load balancing and handover is not greatly influenced based on the IDC assistant information (e.g., if the useful frequency band has a sufficient high RSRP or RSRQ value), the FDM operation may be performed. If not, the TDM operation may be performed in a serving cell.
  • an IDC solution order may be transmitted through an RRC connection reconfiguration message.
  • the IDC solution order may include the operation of an IDC prohibition timer for prohibiting the transmission of IDC assistant information for a specific time.
  • a secondary serving cell may be changed (e.g., a problematic secondary serving cell is deleted) through a serving cell management operation or a handover procedure for changing a primary serving cell may be started.
  • a specific DRX pattern may be transmitted through an RRC connection reconfiguration message.
  • an indicator indicating that a specific DRX pattern is caused by IDC interference, together with the specific DRX pattern, may be transmitted through an RRC connection reconfiguration message.
  • the indicator is called a TDM IDC indicator. Measurement performed by the UE may be differently changed in response to an instruction of the TDM IDC indicator.
  • the IDC solution corresponds to a TDM operation
  • the retransmission of an HARQ in an LTE band may be denied for the handling of a beacon. That is, the start of an IDC solution order may be instructed through IDC assistant information.
  • an IDC solution order process (or IDC solution operation process) may be omitted.
  • FIG. 22 is a flowchart illustrating the operation of a BS which performs IDC interference coordination in accordance with the present invention.
  • the BS receives UE capability information from UE at step S2200.
  • the UE capability information may be transmitted through an RRC message.
  • the UE capability information includes information about IDC assistant information configuration capabilities or an IDC-possible frequency band.
  • the UE capability information may include information about an on-going IDC frequency band.
  • the BS does not receive some of or the entire information about the IDC assistant information configuration capabilities or receives information (e.g., if a corresponding field or indicator is set to a disable state) indicating that IDC assistant information configuration capabilities are not present from the UE, the BS does not instruct the UE to perform an operation related to IDC assistant information.
  • information e.g., if a corresponding field or indicator is set to a disable state
  • the BS transmits an RRC connection reconfiguration message to the UE so that an RRC connection reconfiguration is performed at step S2205.
  • the BS may permit the transmission of IDC assistant information by the UE in an enable state through an RRC connection reconfiguration. If IDC assistant information enable is not present, the transmission of the IDC assistant information is not permitted.
  • IDC assistant information enable is not signaled by the BS although the UE transmits UE capability information to the BS.
  • the BS may perform a frequency configuration (i.e., measurement configuration) for measurement performed by the UE through the RRC connection reconfiguration.
  • a frequency configuration i.e., measurement configuration
  • the BS receives a measurement result performed by the UE, together with IDC assistant information, from the UE at step S2210.
  • the IDC assistant information may include the measurement result.
  • the measurement result may be an available measurement result.
  • a measurement value for all cells e.g., detected cells, list cells, and serving cells
  • all cells e.g., detected cells, list cells, and serving cells
  • a measurement value for serving cells in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • a measurement value for a primary serving cell in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • a measurement report quantity included in the available measurement result may be RSRP and RSRQ for each cell, RSRP for each cell, or RSRQ for each cell.
  • the measurement report quantity may be determined based on the IDC assistant information enable. That is, whether the measurement report quantity will be RSRP, RSRQ, or RSRP and RSRQ may be determined based on the IDC assistant information enable.
  • the measurement performed by the UE may be S-measurement.
  • a measurement result i.e., S-measurement result
  • a serving cell e.g., a secondary serving cell
  • available measurement neighbor cells refer to detected cells and list cells that are not serving cells and are not black list cells in available measurement frequency bands.
  • UE may neglect (or deny) an S-measurement rule set by a network autonomously. That is, when IDC interference is generated within UE (or when the UE becomes an on-going IDC state), the UE neglects a predetermined S-measurement rule and performs measurement on serving cells and available measurement neighbor cells in available measurement frequency bands.
  • the time when the UE neglects the predetermined S-measurement rule may be received through an RRC connection reconfiguration, through an RRC connection reconfiguration message, through additional signaling from a BS. That is, the BS may transmit information about new S-measurement to the UE through the RRC connection reconfiguration.
  • the time when the predetermined S-measurement rule is neglected may be defined depending on an implementation within the UE.
  • the measurement value included in the available measurement result may be a measurement value used to select an FDM-based IDC solution.
  • the measurement value included in the available measurement result may be a measurement value from which the influence of IDC interference has been removed.
  • the IDC assistant information may include information about an unusable frequency band for an FDM-based IDC solution or may include information about a TDM pattern for a TDM-based IDC solution.
  • the IDC assistant information may be information about each of a TDM operation and an FDM operation or information about both the TDM operation and the FDM operation.
  • the information about each of the TDM operation and the FDM operation may be given priority between the TDM operation and the FDM operation, that is, IDC solutions, from a viewpoint of UE.
  • the IDC assistant information may include information about an unusable frequency band.
  • the unusable frequency band may include an on-going IDC frequency band or may include both a potential IDC-problematic frequency band and an on-going IDC frequency band.
  • the IDC assistant information may include information about a TDM pattern.
  • the TDM pattern may include a DRX period, DRX-active duration, or DRX period start offset value.
  • Values related to a DRX parameter for performing an IDC DRX operation may be recommended and transferred through the information about the TDM pattern. That is, the values include the DRX period, DRX-active duration (or duration timer), and DRX period start offset (or DRX subframe offset) values.
  • Information about one TDM pattern may be recommended for each UE and transmitted.
  • the information about the TDM pattern may be independently transmitted for each of frequency bands defined in unusable frequency bands. For example, if EARFCN values of a frequency band whose measurement has been configured are 1, 2, 3, 4, and 5 and an upper bound of the EARFCN value of a frequency band affected by on-going IDC interference is 3, EARFCN values of an unusable frequency band are 1, 2, and 3. DRX parameters for each of the unusable frequency bands are signaled. In order to perform the corresponding signaling, a relationship between a frequency band and a TDM pattern may be additionally signaled.
  • signaling indicative of the number of EARFCN values of an unusable frequency band may be added.
  • a total number of TDM patterns may be known through the number of EARFCN values of an unusable frequency band.
  • the TDM pattern may be mapped in increasing order of the EARFCN values of the unusable frequency band.
  • the EARFCN values of the unusable frequency band may be directly mapped to the respective TDM patterns. That is, when TDM patterns are signaled, EARFCN values corresponding to the respective TDM patterns are signaled at the same time.
  • a TDM pattern may be paired with an EARFCN value and signaled at the same time.
  • additional signaling for each EARFCN value is necessary.
  • the IDC assistant information may include information about the kind or type of a different communication system that may generate IDC interference.
  • the information about the kind of a different communication system may be any of a WLAN, BT, and GNSS.
  • the information about the type of a different communication system may be any of a voice communication type, a streaming service type, such as multimedia VOD, and an offload type.
  • the scope of the present invention is not limited to the kinds and types, and information about various kinds and types of a communication system may be included.
  • the BS selects the most appropriate IDC solution based on the IDC assistant information received from the UE at step S2215.
  • the IDC solution may be an FDM operation or a TDM operation.
  • the FDM operation or TDM operation may be an operation according to FIGS. 5 to 13. For example, when a problem occurs in a frequency band served by the BS, if it is determined that a useful frequency band is not problematic due to load balancing and handover is not greatly influenced based on the IDC assistant information (e.g., if the useful frequency band has a sufficient high RSRP or RSRQ value), the FDM operation may be performed. If not, the TDM operation may be performed in a serving cell.
  • the BS transmits an IDC solution order, including the IDC solution, to the UE so that an IDC solution operation is performed at step S2220.
  • the IDC solution order may be transmitted through an RRC connection reconfiguration message.
  • the IDC solution order may include the operation of an IDC prohibition timer for prohibiting the transmission of IDC assistant information for a specific time.
  • a secondary serving cell may be changed (e.g., a problematic secondary serving cell is deleted) through a serving cell management operation or a handover procedure for changing a primary serving cell may be started.
  • a specific DRX pattern may be transmitted through an RRC connection reconfiguration message.
  • an indicator indicating that a specific DRX pattern is caused by IDC interference, together with the specific DRX pattern, may be transmitted through an RRC connection reconfiguration message.
  • the indicator is called the TDM IDC indicator. Measurement performed by the UE may be differently changed in response to an instruction of the TDM IDC indicator.
  • the IDC solution corresponds to the TDM operation
  • the retransmission of an HARQ in an LTE band may be denied for the handling of a beacon. That is, the start of an IDC solution order may be instructed through IDC assistant information.
  • an IDC solution order process (or IDC solution operation process) may be omitted.
  • FIG. 23 is a block diagram of UE 2300 and a BS 2350 which perform IDC interference coordination in accordance with the present invention.
  • the UE 2300 may include a transmission unit 2330, a reception unit 2305, a control unit 2310, a triggering unit 2315, a measurement unit 2320, and an IDC solution unit 2325.
  • the transmission unit 2330 transmits UE capability information to the BS 2350.
  • the UE capability information may be transmitted through an RRC message.
  • the UE capability information includes information about IDC assistant information configuration capabilities or an IDC-possible frequency band.
  • the UE capability information may further include information about an on-going IDC frequency band.
  • the reception unit 2305 receives an RRC connection reconfiguration message from the BS 2350, and the control unit 2310 performs an RRC connection reconfiguration.
  • the reception unit 2305 receives IDC assistant information enable, the transmission of IDC assistant information about the occurrence of IDC interference may be permitted.
  • the control unit 2310 may perform a measurement configuration, that is, a frequency configuration for performing measurement, through the RRC connection reconfiguration.
  • the control unit 2310 may set an IDC prohibition timer in the UE based on the RRC connection reconfiguration in order to prevent frequent triggering attributable to frequently changed IDC interference.
  • the control unit 2310 may stop (or prohibit or block) the transmission of IDC assistant information for a specific time according to the IDC prohibition timer.
  • the triggering unit 2315 performs IDC assistant information triggering based on an IDC triggering condition.
  • the IDC triggering and measurement may be simultaneously performed, the measurement may be performed prior to the IDC triggering, or the IDC triggering may be performed prior to the measurement.
  • the measurement unit 2320 obtains an available measurement result by performing measurement (e.g., S-measurement).
  • An available measurement frequency band may include all frequency bands according to the measurement configuration received (e.g., received through the RRC connection reconfiguration message) from the BS.
  • Information about the available measurement frequency band may be transmitted through a measurement object.
  • a measurement value for all cells e.g., detected cells, list cells, and serving cells
  • all cells e.g., detected cells, list cells, and serving cells
  • a measurement value for serving cells in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • a measurement value for a primary serving cell in relation to the available measurement frequency band may be reported through the available measurement result, and a measurement value for best cells in relation to the frequency band of each of detected cells and list cells other than black list cells may be reported through the available measurement result.
  • a measurement report quantity included in the available measurement result may be RSRP and RSRQ for each cell, RSRP for each cell, or RSRQ for each cell.
  • the measurement report quantity may be determined based on the IDC assistant information enable. That is, whether the measurement report quantity will be RSRP, RSRQ, or RSRP and RSRQ may be determined based on the IDC assistant information enable.
  • the measurement unit 2320 may not perform measurement when an RSRP (or RSRQ) value of a primary serving cell is smaller than a predetermined S-measurement reference value according to an S-measurement rule set by a network.
  • a measurement result i.e., S-measurement result
  • a serving cell e.g., a secondary serving cell
  • available measurement neighbor cells other than a primary serving cell cannot be transmitted.
  • the measurement unit 2320 may autonomously deny the S-measurement rule set by a network. That is, when IDC interference is generated within the UE (or when the UE becomes an on-going IDC state), the UE neglects a predetermined S-measurement rule and performs measurement on serving cells and available measurement neighbor cells in available measurement frequency bands.
  • the reception unit 2305 may receive the time when a predetermined S-measurement rule is neglected (or a reference value regarding the time when the S-measurement rule is neglected) from the BS 2350 through an RRC connection reconfiguration message.
  • the time when the S-measurement rule is neglected (or the reference value) may be received through signaling different from the RRC connection reconfiguration message.
  • the transmission unit 2330 transmits the measurement result to the BS 2350.
  • the measurement result may be included in the IDC assistant information.
  • the IDC solution unit 2325 performs an IDC solution operation based on an IDC solution selected by the BS 2350.
  • the IDC solution may be an FDM operation or a TDM operation.
  • the FDM operation or TDM operation may be an operation according to FIGS. 5 to 13.
  • the BS 2350 may include a reception unit 2360, a transmission unit 2355, a control unit 2365, and an IDC solution selection unit 2370.
  • the reception unit 2360 receives UE capability information from the UE 2300.
  • the UE capability information may be transmitted through an RRC message.
  • the UE capability information may include information about IDC assistant information configuration capabilities or an IDC-possible frequency band.
  • the transmission unit 2355 transmits an RRC connection reconfiguration message to the UE 2300 so that an RRC connection reconfiguration is performed.
  • the control unit 2365 may perform a frequency configuration (or measurement configuration) for the measurement of the UE 2300 through the RRC connection reconfiguration and permit the transmission of IDC assistant information by the UE 2300 in an enable state.
  • the reception unit 2360 receives a measurement result performed by the UE 2300, together with IDC assistant information, from the UE 2300.
  • the IDC assistant information may include the measurement result.
  • the measurement result may be an available measurement result.
  • An available measurement frequency band may include all frequency bands according to the measurement configuration received from the BS 2350. Information about the available measurement frequency band may be transmitted through a measurement object.
  • the transmission unit 2355 transmits the time when a predetermined S-measurement rule is neglected (or a reference value for the time when the S-measurement rule is neglected) to the UE 2300 through the RRC connection reconfiguration message.
  • the IDC solution selection unit 2370 selects the most appropriate IDC solution based on the IDC assistant information.
  • the IDC solution may be an FDM operation or a TDM operation.
  • the FDM operation or TDM operation may be an operation according to FIGS. 5 to 13.
  • the transmission unit 2355 transmits an IDC solution order, including the IDC solution, to the UE 2300.
  • the IDC solution order may be transmitted through an RRC connection reconfiguration message.
  • the IDC solution order may include the operation of an IDC prohibition timer for prohibiting the transmission of IDC assistant information for a specific time.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé permettant à un équipement d'utilisateur (UE) de mettre en oeuvre une coordination du brouillage de coexistence intradispositif (IDC) dans un système de télécommunication sans fil, ledit procédé consistant à : recevoir un message de reconfiguration de connexion de commande de ressources radioélectriques (RRC) incluant une configuration de mesure, laquelle constitue une configuration de fréquences en vue d'une mesure ; mettre en oeuvre une mesure sur des cellules voisines quand le résultat de mesure concernant une cellule de desserte primaire est supérieur ou égal à une valeur de référence spécifique, en relation avec toutes les bandes de fréquence configurées selon la configuration de mesure ; et transmettre à une station de base (BS) un rapport de résultat de mesure, qui comprend le résultat de mesure obtenu par la suppression d'un effet de brouillage IDC d'un échantillon de mesure, sur lequel la mesure a été mise en oeuvre.
PCT/KR2013/003979 2012-05-07 2013-05-07 Appareil et procédé pour régler le brouillage de coexistence intradispositif dans un système de télécommunication sans fil WO2013168977A1 (fr)

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EP2961236A1 (fr) * 2014-06-27 2015-12-30 Innovative Sonic Corporation Procédé et appareil pour une coopération entre un équipement utilisateur (ue) et une cellule de desserte dans un système de communication sans fil
CN109151996A (zh) * 2018-09-05 2019-01-04 合肥开元埃尔软件股份有限公司 一种基于125K辅助的蓝牙beacon室内定位设备
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WO2022000352A1 (fr) * 2020-06-30 2022-01-06 华为技术有限公司 Procédé, appareil et système de mesure de relation de voisinage automatique (anr)
WO2024031343A1 (fr) * 2022-08-09 2024-02-15 Apple Inc. Rapport de coexistence intra-dispositif amélioré dans des systèmes de communication sans fil

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