WO2013025026A2 - Appareil et procédé de limitation de brouillage de coexistence intra-dispositif dans un système de communication sans fil - Google Patents

Appareil et procédé de limitation de brouillage de coexistence intra-dispositif dans un système de communication sans fil Download PDF

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Publication number
WO2013025026A2
WO2013025026A2 PCT/KR2012/006429 KR2012006429W WO2013025026A2 WO 2013025026 A2 WO2013025026 A2 WO 2013025026A2 KR 2012006429 W KR2012006429 W KR 2012006429W WO 2013025026 A2 WO2013025026 A2 WO 2013025026A2
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WIPO (PCT)
Prior art keywords
random access
base station
transmission
ism
terminal
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PCT/KR2012/006429
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English (en)
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WO2013025026A3 (fr
Inventor
Jae Hyun Ahn
Ki Bum Kwon
Myung Cheul Jung
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Pantech Co., Ltd.
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Priority claimed from KR1020120027939A external-priority patent/KR20130018101A/ko
Application filed by Pantech Co., Ltd. filed Critical Pantech Co., Ltd.
Publication of WO2013025026A2 publication Critical patent/WO2013025026A2/fr
Publication of WO2013025026A3 publication Critical patent/WO2013025026A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • 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

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to an apparatus and a method for controlling in-device coexistence interference in a wireless communication system.
  • a wireless communication system generally uses one bandwidth for transmitting data.
  • a 2-generation wireless communication system uses a bandwidth in the range of 200 KHz to 1.25 MHz and a 3-generation wireless communication system uses a bandwidth in the range of 5 MHz to 10 MHz.
  • 3GPP 3 rd generation partnership project
  • LTE long term evolution
  • IEEE 802.16m has extended a bandwidth thereof up to 20 MHz or more in recent years.
  • the bandwidth may need to increase so as to increase the transmission capacity, but supporting a large bandwidth even when a required service level is low may cause large power consumption.
  • a multiple component carrier system which defines a carrier having one bandwidth and one center frequency, and can transmit or receive data in a wideband through a plurality of carriers.
  • a narrowband and the wideband are simultaneously supported by using one or more carriers. For example, when one carrier corresponds to a bandwidth of 5 MHz, a bandwidth of maximum 20 MHz is supported by using four carriers.
  • in-device coexistence interference means interference when transmission in any one frequency band interferes in reception in another frequency band.
  • the in-device coexistence interference may occur between a Bluetooth system band and a 802.16 system band when one terminal supports both a Bluetooth system and a 802.16 system.
  • the in-device coexistence interference may occur primarily when a spacing interval of a frequency band boundary of a heterogeneous network system is not sufficiently large.
  • ICO In-device Coexistence interference avOidance
  • the present invention provides an apparatus and a method for controlling in-device coexistence interference.
  • the present invention also provides an apparatus and a method for reducing occurrence of in-device coexistence interference at the time of performing a handover.
  • the present invention also provides an apparatus and a method for reducing occurrence of in-device coexistence interference at the time of performing RRC connection reconfiguration.
  • the present invention also provides an apparatus and a method for reducing occurrence of in-device coexistence interference at the time of performing cell reselection.
  • the present invention also provides an apparatus and a method for holding transmission in an ISM band so as to reduce occurrence of in-device coexistence interference.
  • a method for controlling interference by a terminal in a wireless communication system includes: receiving a radio resource control (RRC) connection reconfiguration message including a random access response window interval from a first base station; comparing a predetermined threshold with a preamble transmission failure counter; and holding transmission/reception in an ISM band during the random access response window interval and performing a random access to a second base station when the preamble transmission failure counter is larger than the predetermined threshold.
  • RRC radio resource control
  • both the transmission and the reception may be removed in the ISM band, only the transmission may be removed in the ISM band, transmission power of the ISM band may be controlled to be equal to or less than a predetermined reference power value.
  • the preamble transmission failure counter may be increased by a predetermined integer when a random access response is disabled to be received from the second base station during the random access response window interval, and the predetermined threshold may be compared with the increased preamble transmission failure counter again.
  • transmission power of WiFi or Bluetooth that may perform the transmission/reception in the ISM band may be controlled.
  • a random access preamble may be transmitted to the second base station, a random access response to the random access preamble may be received from the second base station, and an RRC connection reconfiguration complete message for the random access response may be transmitted to the second base station.
  • a new random access preamble may be again transmitted to the second base station when the receiving of the random access response is failed during the random access response window interval.
  • the random access response window interval may start after three subframes from the time when the transmission of the random access preamble to the second base station is completed.
  • a terminal for controlling in-device interference in a wireless communication system includes: receiving a radio resource control (RRC) connection reconfiguration message including a random access response window interval from the first base station; a control unit comparing a predetermined threshold with a preamble transmission failure counter and holding transmission/reception in an industrial, scientific and medical) ISM band during the random access response window interval when the preamble transmission failure counter is larger than the predetermined threshold; and an LTE transmitting unit transmitting to a second base station a random access preamble until receiving a random access response from the second base station.
  • RRC radio resource control
  • 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 in-device coexistence interference from an ISM transmitter to an LTE receiver.
  • 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 by using a TDM scheme according to the present invention.
  • FIG. 10 illustrates a transmission/reception timing on time axes in an LTE band an 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 by using the TDM scheme according to the present invention.
  • FIG. 12 is a diagram illustrating yet another example of alleviating the in-device coexistence interference by using the TDM scheme according to the present invention.
  • FIG. 13 is a diagram illustrating yet another example of alleviating the in-device coexistence interference by using the TDM scheme according to the present invention.
  • FIGS. 14 to 17 illustrate a case in which RLE according to the exemplary embodiment of the present invention while a handover is performed.
  • FIG. 18 is a flowchart illustrating performing of the handover by controlling the in-device coexistence interference according to the present invention.
  • FIG. 19 is a flowchart illustrating a case in which a terminal performs an ISM band holding operation in a random access response Window interval.
  • FIG. 20 is a flowchart illustrating another case in which the terminal performs the ISM band holding operation in the random access response Window interval.
  • FIGS. 21 to 25 are flowcharts illustrating an operation of a terminal according to an exemplary embodiment of the present invention.
  • FIG. 26 is a flowchart illustrating an operation of a terminal according to yet another exemplary embodiment of the present invention.
  • FIG. 27 is a flowchart illustrating an operation of a base station according to an exemplary embodiment of the present invention.
  • FIG. 28 is a block diagram describing an apparatus for controlling in-device coexistence interference according an exemplary embodiment of the present invention.
  • a wireless communication network is described as a target, a work performed in the wireless communication network is performed while a system (for example, a base station) controlling the corresponding wireless communication network controls the network or transmits data or in a terminal combined to the corresponding wireless network.
  • a system for example, a base station
  • 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 (user equipment, UE) 10, a base station (or evolved NodeB, eNB) 20, a wireless LAN access point (AP) 30, a global positioning system (GPS) 40, and a satellite.
  • 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 eNB 20 includes an LTE RF 21, a GPS RF 22, and a Bluetooth/WiFi RF 23.
  • Transceiving antennas 24, 25, and 26 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.
  • (1) is an example in which the transmission signal of the LTE RF 21 causes the in-device coexistence interference in the GPS RF 22 and the Bluetooth/WiFi RF 23 and (2) is an example in which the transmission signal of the Bluetooth/WiFi RF 23 causes the in-device coexistence interference in the LTE RF 21.
  • 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. Therefore, in the band 40, 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 may occur.
  • the backward compatibility 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.
  • 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 by using the time division multiplex (TDM) scheme 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 .
  • transmission/reception timings on time axes in the LTE band and the ISM band using the TDM scheme may be illustrated in FIG. 10.
  • the in-device coexistence interference may be avoided without movement between the LTE band and the ISM band by the scheme of FIG. 9.
  • FIG. 11 is a diagram illustrating another example of alleviating the in-device coexistence interference by using the TDM scheme 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 LTE 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.
  • FIG. 12 is a diagram illustrating yet another example of alleviating the in-device coexistence interference by using the TDM scheme according to the present invention.
  • a retransmission signal is preferably protected when data is transmitted based on the HARQ.
  • the protection represents that retransmission is achieved without fail. If retransmission is not achieved in order to alleviate or avoid the in-device coexistence interference in the TDM scheme, the performance of the system will remarkably deteriorate.
  • a transmission pattern is determined by considering a retransmission period. For DL transmission, subframes 1 and 6 are reserved in advance and for UL transmission, subframes 2 and 7 are reserved. These are called scheduled subframes. Unscheduled subframes for alleviating the in-device coexistence interference are not used in transmission in order to protect the ISM band.
  • the subframes reserved for transmission may be prevented from being transmitted in order to transmit a primary signal in the ISM.
  • primary messages such as random access, system information, and a paging signal may be permitted to be transmitted.
  • the pattern may be given as a bitmap pattern. That is, the number of subframes indicated by one bit may be one or more.
  • the period of the pattern is "the total length of the bitmap * the number of subframes per bit", and each bit may be 0 when a subframe directed by the bit is the scheduled subframe and each bit may be 1 when the corresponding subframe is the unscheduled subframe. On the contrary, when each subframe is the scheduled subframe, each bit may be 1 and when each subframe is the unscheduled subframe, each bit may be 0.
  • a pattern expressing the subframe is "1001001000"
  • the unscheduled subframe is 0, and the number of the subframes indicated by one bit is two.
  • first, fourth, and seventh bits are 1, subframes 0, 1, 6, 7, 12, and 13 are the scheduled subframes every period.
  • FIG. 13 is a diagram illustrating yet another example of alleviating the in-device coexistence interference by using the TDM scheme according to the present invention.
  • the occurrence of the RLF means a state in which it is difficult to receive the message because a wireless connection state deteriorates.
  • the corresponding state is determined based on a receiving rate of a physical downlink control channel (PDCCH). Since it is difficult to receive the message, the terminal tries to solve the RLF by using a method such as connection reconfiguration or cell reselection.
  • the RLF may occur in the case of a coverage hole of the corresponding base station or by a deteriorated channel state during the handover.
  • the coverage hole is positioned within communication coverage of the base station as a geographical position, but means a position where the channel state significantly deteriorates due to various reasons.
  • the RLF occurs in the case of an out-of-sync phenomenon.
  • the terminal operates a timer as the out-of-sync occurs when a value smaller than a predetermined threshold Qout is continuously measured at the predetermined number of times or more as a measurement result of a channel quality.
  • a value larger than the predetermined threshold is continuously measured at the predetermined number of times, in-sync occurs and thus, the RLF does not occur, but when the in-sync does not occur until the timer is terminated, the out-of-sync is finally judged and the RLF occurs.
  • the RLF occurs when RRC connection setup procedure is in process, when RRC connection reconfiguration procedure is in progress, when RRC connection reestablishment is no in progress, or when random access procedure failure occurs.
  • the RLF occurs even when the maximum number of retransmission times is exceeded on radio link control (RLC).
  • RLC radio link control
  • the terminal detects the occurrence of the RLF. Thereafter, the terminal (alternately, the base station) performs different operations depending on whether an access system (AS) security is activated.
  • AS access system
  • FIGS. 14 to 17 illustrate a case in which RLE according to the exemplary embodiment of the present invention while a handover is performed.
  • the in-device coexistence interference has already occurred in the target cell at the time when the handover starts from the serving cell to the target cell, in the case of the terminal, and in this case, when the RLF occurs, the handover may be failed.
  • the in-device coexistence interference occurs in the target cell while the handover is performed from the serving cell to the target cell, and as a result, when the RLF occurs, the handover may be failed.
  • the in-device coexistence interference has already occurred in the target cell at the time when the handover starts from the serving cell to the target cell, in the case of the terminal, and in this case, when the RLF occurs, the handover may be failed.
  • the in-device coexistence interference occurs in the target cell while the handover is performed from the serving cell to the target cell, and as a result, when the RLF occurs, the handover may be failed.
  • FIG. 18 is a flowchart illustrating performing of the handover by controlling the in-device coexistence interference according to the present invention.
  • the terminal receives a handover command from a source base station (S1800). From this time, the handover starts.
  • the handover command may be transmitted with being included in the RRC connection reconfiguration message.
  • the terminal starts an ISM band holding operation (S1805).
  • the ISM band holding operation means a case in which the signal is never transmitted or received in the ISM band or transmission power is decreased to be equal to or less than a predetermined threshold when the in-device coexistence interference occurs (alternatively, when the in-device coexistence interference may occur).
  • the ISM band holding operation is used to remove or reduce the in-device coexistence interference.
  • the terminal may drawn the RF itself of the ISM. That is, the terminal does not perform both transmission and reception in the ISM band. Transmission or reception in the ISM band may be performed through a WiFi channel or a Bluetooth channel and in this regard, transmission/reception of WiFi or Bluetooth may be turned off so as to prevent transmission or reception itself.
  • the terminal may not perform only transmission without interrupting reception in the ISM band.
  • a scheme of ignoring transmission scheduling in the ISM band or a scheme of delaying a transmission time of the ISM RF is provided.
  • transmission power of the ISM may be controlled to be equal to or less than a predetermined threshold.
  • the transmission power control may be determined by the terminal itself and the base station gives a transmission power control (TPC) command to the terminal to control power.
  • TPC command may be included in a downlink control information (DCI) format within the PDCCH.
  • DCI downlink control information
  • transmission of the LTE is denied in order to protect the reception of the ISM when the in-device coexistence interference occurs in the terminal by using the autonomously denial scheme using the TDM scheme as illustrated in FIG. 13.
  • transmission of the ISM is denied in order to protect the reception of the LTE.
  • the terminal may turn off the RF itself of the ISM, interrupt only transmission without interrupting reception in the ISM band, or control the transmission power of the ISM to be equal to or less than a predetermined threshold, only with respect to a PDCCH area within the subframe.
  • the RF itself of the ISM may be turned off with respect to all the corresponding subframes, only transmission may be interrupted without interrupting reception in the ISM band, or the transmission power of the ISM may be controlled to equal to or less than the predetermined threshold.
  • the ISM band holding operation is referred to as a partially ISM denial.
  • the PDCCH area means the sum of the number of OFDM symbols used to transmit the PDCCH transmitted by a physical control format indicator channel (PCFICH) and the sizes of areas required to decode the PDCCH in the terminal, in the case of the LTE.
  • PCFICH physical control format indicator channel
  • the areas required to decode the PDCCH may depend on implementation of the terminal, but in general, the PDCCH may be decoded for one symbol duration.
  • a random access process is performed in order for the terminal which starts the ISM band holding operation to perform the handover from the source base station to a target base station (S1810).
  • the terminal transmits the RRC reconfiguration complete message to the target base station (S1815).
  • the terminal may start ISM band holding from the time of receiving the handover command and terminate the holding operation at the time of transmitting the RRC reconfiguration complete message to the base station.
  • the terminal may start the ISM band holding operation at the time of transmitting a random access preamble to the target base station and terminate the holding operation at the time of transmitting the RRC reconfiguration complete message to the base station.
  • FIG. 19 is a flowchart illustrating a case in which the terminal performs the ISM band holding operation in the random access response Window interval.
  • the terminal transmits the random access preamble to the base station (for example, the target base station) (S1900).
  • the base station for example, the target base station
  • the random access response window interval starts and in this case, the ISM band holding operation also starts (S1905).
  • the terminal monitors whether the base station transmits the PDCCH in the random access response window interval which starts after three subframes from the time when transmission of the random access preamble is terminated. Therefore, the ISM band holding operation that operates to remove the in-device coexistence interference also starts at a start time of the random access response window interval.
  • RA-RNTI random access- radio network temporary identity
  • the length of the random access response window interval is variable and is directed through a parameter 'ra-ResponseWindowSize'.
  • 'ra-ResponseWindowSize' the base station may transmit the random access response after ten subframes from the time of receiving the random access preamble of the terminal after three subframes from the time of receiving the random access preamble of the terminal. That is, the length of an interval when the random access response may be transmitted is seven subframes.
  • the length of the random access response window interval 'ra-ResponseWindowSize' may be transmitted to the terminal in advance through RRC signaling and the following table illustrates one example thereof.
  • sf2 indicates subframe 2
  • sf3 indicates subframe 3
  • sf4 indicates subframe 4
  • sf5 indicates subframe 5
  • sf6 indicates subframe 6
  • sf7 indicates subframe 7
  • sf8 indicates subframe 8
  • sf10 indicates subframe 10.
  • the base station may transmit the random access response to the terminal at one time in the random access response window interval (S1910).
  • the terminal verifies whether the random access response is transmitted during the random access window interval and if so, the terminal receives the random access response.
  • the ISM band holding operation is terminated at the time (after 'ra-ResponseWindowSize' from a start time of the random access response window interval) when the random access response window interval ends (S1915).
  • the holding operation will be started and terminated similarly as the aforementioned operation. That is, holding will be applied only within the random access response window.
  • the ISM band holding operation (alternatively, ISM denial) in only a part of a random RAR access response window area. That is, the ISM denial may be partially performed.
  • FIG. 20 is a flowchart illustrating another case in which the terminal performs the ISM band holding operation in the random access response Window interval.
  • the base station transmits a RAR to the terminal as a response thereto (S2005).
  • RAR window size (ra-ResponseWindowSize) 2050 is four subframes and a RAR window area determined the RAR window size is present outside a continuous interval timer operation area
  • autonomous denial of partial ISM transmission is performed with respect to the RAR window area, and as a result, partial ISM transmission holding may be performed (S2010).
  • the ISM transmission need not be denied, and as a result, the ISM transmission is permitted.
  • the IDC may occur by the ISM transmission, and as a result, the ISM transmission is denied.
  • the PDCCH is a PDCCH which is not scrambled by a random access-radio network temporary identifier (RA-RNTI) indicating existence of a RAR MAC control element (RAR MAC CE), autonomous ISM denial need not be performed with respect to the non-PDCCH area indicated by the PDCCH in addition to the corresponding PDCCH.
  • RA-RNTI random access-radio network temporary identifier
  • RAR MAC CE RAR MAC control element
  • the autonomous ISM denial may be performed in order to receive the RAR with respect to a subframe area indicated by the PDCCH area which is scrambled by the RA-RNTI indicating the existence of the RAR MAC CE.
  • the terminal transmits the random access preamble to the target base station, but when the terminal is in capable of receiving the random access response from the base station during the random access response window interval to fail in random access, the terminal may start the ISM band holding operation at the time of retransmitting the random access preamble to the target base station and terminate the ISM band holding operation at the time of transmitting the RRC reconfiguration complete message to the base station.
  • the holding operation will be started and terminated similarly as the aforementioned operation. That is, holding will be applied only within the random access response window.
  • FIG. 21 is a flowchart illustrating the operation of the terminal according to the exemplary embodiment of the present invention.
  • the terminal receives the handover command (S2100) and starts the ISM band holding operation (S2105). Simultaneously when the terminal starts the ISM band holding operation or after the terminal starts the ISM band holding operation, the terminal transmits the random access preamble to the base station (S2110).
  • the terminal transmits the RRC reconfiguration complete message to the base station through uplink granting and terminates the ISM band holding operation (S2120).
  • the terminal retransmits the random access preamble to the base station and repeats the steps after step S2110.
  • FIG. 22 is a flowchart illustrating an operation of a terminal according to another exemplary embodiment of the present invention.
  • the terminal receives the handover command (S2200) and first transmits the random access preamble to the base station (S2205).
  • the terminal starts the ISM band holding operation at the time of transmitting the random access preamble or after transmitting the random access preamble (S2210).
  • the terminal transmits the RRC reconfiguration complete message to the base station through the uplink granting and terminates the ISM band holding operation (S2220).
  • the terminal retransmits the random access preamble to the base station again and repeats the steps after step S2205. In this process, the terminal may continuously perform the ISM band holding operation.
  • FIG. 23 is a flowchart illustrating an operation of a terminal according to another exemplary embodiment of the present invention.
  • the terminal receives the handover command (S2300) and first transmits the random access preamble to the base station (S2305).
  • the terminal performs the ISM band holding operation during the random access response window interval (S2310). That is, the terminal performs the ISM band holding operation during the ra-ResponseWindowSize period after three subframes from the time of completing the transmission of the random access preamble.
  • the terminal transmits the RRC reconfiguration complete message to the base station through the uplink granting (S2320).
  • the terminal terminates the ISM band holding operation when the random access response interval is terminated.
  • the terminal retransmits the random access preamble to the base station (S2110).
  • the terminal performs the ISM band holding operation again during the random access response window interval after retransmitting the random access preamble.
  • FIG. 24 is a flowchart illustrating the operation of the terminal according to the exemplary embodiment of the present invention.
  • the terminal receives the handover command and resets a preamble transmission failure counter (S2400).
  • the preamble transmission failure counter is an indicator used to start the ISM band holding operation when the transmission of the random access preamble is failed at the predetermined number times or more.
  • the preamble transmission failure counter is used to perform the transmission holding operation of the ISM band at last.
  • the terminal transmits the random access preamble to the base station (S2405). It is judged whether the preamble transmission failure counter is larger than a predetermined threshold (S2410).
  • the predetermined threshold may be a reference to judge whether the in-device coexistence interference is an ignorable level.
  • the threshold may be, in advance, set by the terminal or the base station.
  • the ISM band holding operation is performed within the random access response window interval (S2415). Thereafter, it is judged whether the terminal receives the random access response including the random access preamble ID from the base station (S2420) and when the terminal receives the random access response, the terminal transmits the RRC connection reconfiguration complete message to the base station through the uplink granting (S2425). On the contrary, when the terminal is incapable of receiving the random access response, the terminal increases the preamble transmission failure counter (S2430) and thereafter, retransmits the random access preamble to the base station (S2405).
  • the preamble transmission failure counter may be increased by an integer (for example, 1). Subsequently, the terminal repeats the operation after step S2405.
  • step S2410 when the preamble transmission failure counter is equal to or less than the predetermined threshold in step S2410, the terminal does not perform the ISM band holding operation. The reason is that the in-device coexistence interference is slight and thus, it is judged that the ISM band holding operation is not required. Subsequently, the terminal repeats the operation of step S2420.
  • FIG. 25 is a flowchart illustrating the operation of the terminal according to the exemplary embodiment of the present invention.
  • the terminal receives the handover command and resets the preamble transmission failure counter (S2500).
  • the terminal transmits the random access preamble to the base station (S2505). It is judged whether the preamble transmission failure counter is larger than the predetermined threshold (S2510).
  • the terminal performs the ISM band holding operation (S2515). In this case, the terminal may perform the ISM band holding operation even not in the random access response window interval unlike FIG. 24.
  • the ISM band holding operation may start from the time of judging whether the preamble transmission failure counter is larger than the predetermined threshold. Further, the ISM band holding operation may be terminated at the time of transmitting the RRC connection reconfiguration complete message.
  • the terminal It is judged whether the random access response including the random access preamble ID is received from the base station (S2520), and when the random access response is received, the RRC connection reconfiguration complete message is transmitted to the base station through the uplink granting (S2525).
  • the terminal increases the preamble transmission failure counter (S2530) and thereafter, retransmits the random access preamble to the base station (S2505).
  • the preamble transmission failure counter may be increased by THE integer (for example, 1). Subsequently, the terminal repeats the operation after step S2505 again.
  • step S2510 when the preamble transmission failure counter is equal to or less than the predetermined threshold in step S2510, the terminal does not perform the ISM band holding operation. Subsequently, the terminal performs the operation of step S2520.
  • FIG. 26 is a flowchart illustrating an operation of a terminal according to yet another exemplary embodiment of the present invention.
  • the terminal receives the handover command (S2600) and transmits the random access preamble to the base station (S2605).
  • the terminal performs the ISM band holding operation during the random access response window interval, in which the terminal performs the ISM band holding operation by turning off the RF itself of the ISM, interrupts only transmission without interrupting reception in the ISM band, or controlling the transmission power of the ISM to be equal to or less than the predetermined threshold with respect to only the PDCCH area within the subframe (S2610). That is, the terminal performs the ISM band holding operation during the random access response window size (ra-ResponseWindowSize) period after three subframes from the time of completing the transmission of the random access preamble.
  • the random access response window size ra-ResponseWindowSize
  • the RF itself of the ISM may be turned off with respect to all the corresponding subframes, only transmission may be interrupted without interrupting reception in the ISM band, or the transmission power of the ISM may be controlled to equal to or less than the predetermined threshold.
  • the terminal judges whether the random access response including the random access preamble ID is received from the base station (S2630), and when the random access response is received, the terminal transmits the RRC connection reconfiguration complete message to the base station through the uplink granting (S2635).
  • the ISM band holding operation is terminated when the random access response interval is terminated.
  • the terminal When the terminal is incapable of receiving the random access response including the random access preamble ID from the base station, the terminal retransmits the random access preamble to the base station and thereafter, performs the ISM band holding operation in the random access response window interval (S2605).
  • FIG. 27 is a flowchart illustrating the operation of the base station according to the exemplary embodiment of the present invention.
  • the base station when the base station receives the random access preamble from the terminal (S2700), the base station transmits the random access response including the random access preamble ID to the terminal (S2705).
  • the random access response may include power adjustment, a time advance (TA) command, or the uplink granting.
  • the base station receives the RRC reestablishment complete message from the terminal through the uplink granting (S2710).
  • the ISM band holding operations described in FIGS. 18 to 27 may be applied in the same or similar manner.
  • the terminal transmits the RRC connection reestablishment request message to the base station and operates the timer, and when the terminal receives the RRC connection reestablishment message before the timer is terminated, the terminal succeeds in RRC connection reestablishment and in this case, when the terminal receives the RRC connection reestablishment message before the timer is terminated, and in this case, the terminal transmits the RRC connection reestablishment complete message to the base station.
  • the terminal fails in the RRC connection reestablishment and the RLF occurs.
  • the ISM band holding operation may be applied.
  • the ISM band holding operation may be applied throughout the cell reselection process. That is, the terminal may perform the ISM band holding operation during measurement until the terminal finds a cell suitable for camping-on. Alternatively, after the terminal finds the cell suitable for camping-on, the ISM band holding operation may be applied even during the RRC connection reestablishment.
  • the terminal transmits the RRC reestablishment request message to the base station during the RRC connection reestablishment
  • the ISM band holding operation may be applied until the terminal receives the RRC reestablishment response message after transmitting the RRC reestablishment request message to the base station.
  • a success rate of the RRC reestablishment may be increased by removing the in-device coexistence interference that occurs at the time of receiving the RRC reestablishment response.
  • FIG. 28 is a block diagram describing an apparatus for controlling in-device coexistence interference according an exemplary embodiment of the present invention.
  • a terminal 2800 and a base station 2850 exchange information on the in-device coexistence interference.
  • the information on the in-device coexistence interference includes the handover command, the RRC signaling, the RRC connection reestablishment message, the RRC connection reconfiguration message, the random access response, and the like, which the base station 2850 transmit to the terminal 2800. Further, the information includes the random access preamble, the RRC connection reconfiguration complete message, the RRC connection reconfiguration request message, or the RRC connection reconfiguration complete message which the terminal 2800 transmits to the base station 2850.
  • the terminal 2800 includes a control unit 2810, an LTE module 2820, and an ISM module 2830.
  • the control unit 2810 controls the ISM band holding operation.
  • the control unit 2810 may include at least one of a triggering unit 2812, a holding interval calculating unit 2814, and a holding command unit 2816.
  • the triggering unit 2812 triggers the start of the ISM band holding operation.
  • the ISM band holding operation may start at the time of receiving the RRC connection reconfiguration message, at the time of transmitting the random access preamble, or at the time when the random access response window interval starts.
  • the holding interval calculating unit 2814 may calculate the random access response window interval.
  • the holding interval calculating unit 2814 may calculate the random access response window interval by receiving the parameter 'ra-ResponseWindowSize' and if the start point an the termination time of the ISM band holding operation are known, the holding interval calculating unit 2814 may calculate a difference therebetween.
  • the terminal may start ISM band holding from the time of receiving the handover command and terminate the holding operation at the time of transmitting the RRC reconfiguration complete message to the base station.
  • the terminal may start the ISM band holding operation at the time of transmitting a random access preamble to the target base station and terminate the holding operation at the time of transmitting the RRC reconfiguration complete message to the base station.
  • the terminal may perform the ISM band holding operation in the random access response window interval.
  • the terminal may turn off the RF itself of the ISM, interrupt only transmission without interrupting reception in the ISM band, or control the transmission power of the ISM to be equal to or less than the predetermined threshold, with respect to the PDCCH area within the subframe.
  • the RF itself of the ISM may be turned off with respect to all the corresponding subframes, only transmission may be interrupted without interrupting reception in the ISM band, or the transmission power of the ISM may be controlled to equal to or less than the predetermined threshold.
  • the holding command unit 2816 commands the ISM band holding operation.
  • the holding command unit 2816 commands that the ISM band holding operation is performed only in the case where the preamble transmission failure counter is larger than the predetermined threshold.
  • the holding command unit 2816 may not perform both transmission and reception in the ISM band by turning off the RF itself of the ISM. As another example of the holding operation, the holding command unit 2816 may not perform only transmission without interrupting reception in the ISM band and in this case, the holding command unit 2816 ignores transmission scheduling in the ISM band or delays the transmission time of the ISM RF in order not to perform transmission in the ISM band. As yet another example of the holding operation, the holding command unit 2816 may control the transmission power of the ISM to be equal to or less than the predetermined threshold, and the control of the transmission power may be determined by the terminal itself and the base station gives a transmission power control command to the terminal to control power.
  • the transmission power control command may be included in a DCI format within the PDCCH.
  • the holding command unit 2816 may perform the autonomously denial scheme using the TDM scheme and when the in-device coexistence interference occurs, transmission of the LTE is denied in order to protect the reception of the ISM.
  • the LTE module 2820 may include a terminal LTE receiving unit 2822 and a terminal LTE transmitting unit 2824.
  • the LTE module 2820 performs LTE transmission or reception.
  • the terminal LTE receiving unit 2822 may receive the RRC connection reconfiguration message including the handover command, the RRC connection reestablishment message, the random access response, or the RRC signaling from the base station 2850.
  • the terminal LTE transmitting unit 2824 may transmit the random access preamble, the RRC connection reconfiguration complete message, the RRC connection reestablishment request message, or the RRC connection reestablishment complete message to the base station 2850.
  • the ISM module 2830 performs transmission/reception in the ISM band.
  • the base station 2850 may include an LTE module 2860.
  • the LTE module 2860 may include a base station LTE transmitting unit 2862 and a base station LTE receiving unit 2864.
  • the LTE module 2860 performs LTE transmission or reception.
  • the base station LTE transmitting unit 2862 may transmit the RRC connection reconfiguration message including the handover command, the RRC connection reestablishment message, the random access response, or the RRC signaling from the terminal 2800.
  • the base station LTE receiving unit 2864 may receive the random access preamble, the RRC connection reconfiguration complete message, the RRC connection reestablishment request message, or the RRC connection reestablishment complete message from the terminal 2800.

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

Abstract

L'invention porte sur un procédé et un appareil de limitation de brouillage de coexistence intra-dispositif par un terminal dans un système de communication sans fil. Le procédé de limitation de brouillage selon la présente invention consiste à : recevoir un message de reconfiguration de connexion de gestion des ressources radio (RRC) comprenant un intervalle de fenêtre de réponse d'accès aléatoire en provenance d'une première station de base ; comparer un seuil prédéterminé à un compteur d'échec de transmission de préambule ; et retenir une émission/réception dans une bande ISM durant l'intervalle de fenêtre de réponse d'accès aléatoire et effectuer un accès aléatoire vers une seconde station de base quand le compteur d'échec de transmission de préambule est supérieur au seuil prédéterminé.
PCT/KR2012/006429 2011-08-12 2012-08-13 Appareil et procédé de limitation de brouillage de coexistence intra-dispositif dans un système de communication sans fil WO2013025026A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2011-0080888 2011-08-12
KR20110080888 2011-08-12
KR10-2012-0027939 2012-03-19
KR1020120027939A KR20130018101A (ko) 2011-08-12 2012-03-19 무선통신 시스템에서 기기 내 공존 간섭 제어 장치 및 방법

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WO2020175803A1 (fr) * 2019-02-26 2020-09-03 Samsung Electronics Co., Ltd. Dispositif électronique prenant en charge une communication de réseau 5g et procédé de dispositif électronique destiné à commander une puissance de transmission

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US9655064B2 (en) 2014-05-15 2017-05-16 Lg Electronics Inc. Controlling power in non-licensed band
US9838983B2 (en) 2014-05-15 2017-12-05 Lg Electronics Inc. Controlling power in non-licensed band
US10045313B2 (en) 2014-05-15 2018-08-07 Lg Electronics Inc. Controlling power in non-licensed band
US10433266B2 (en) 2014-05-15 2019-10-01 Lg Electronics Inc. Controlling power in non-licensed band
CN110798852A (zh) * 2016-04-19 2020-02-14 展讯通信（上海）有限公司 一种自组网的增强方法和终端设备
CN110798852B (zh) * 2016-04-19 2022-10-25 展讯通信（上海）有限公司 一种自组网的增强方法和终端设备
US10638378B2 (en) * 2017-05-05 2020-04-28 Qualcomm Incorporated UE selection of contention-free and contention-based random access for handover
US11382007B2 (en) 2017-05-05 2022-07-05 Qualcomm Incorporated UE selection of contention-free and contention-based random access for handover
US20180324653A1 (en) * 2017-05-05 2018-11-08 Qualcomm Incorporated Ue selection of contention-free and contention-based random access for handover
WO2020175803A1 (fr) * 2019-02-26 2020-09-03 Samsung Electronics Co., Ltd. Dispositif électronique prenant en charge une communication de réseau 5g et procédé de dispositif électronique destiné à commander une puissance de transmission
US11304147B2 (en) 2019-02-26 2022-04-12 Samsung Electronics Co., Ltd. Electronic device supporting 5G network communication and method for electronic device to control transmit power

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