JP2013135386A - Communication terminal device and signaling method - Google Patents

Communication terminal device and signaling method Download PDF

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JP2013135386A
JP2013135386A JP2011285670A JP2011285670A JP2013135386A JP 2013135386 A JP2013135386 A JP 2013135386A JP 2011285670 A JP2011285670 A JP 2011285670A JP 2011285670 A JP2011285670 A JP 2011285670A JP 2013135386 A JP2013135386 A JP 2013135386A
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signaling signal
handover
extended
existing
communication terminal
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Takeshi Tanaka
武志 田中
Hidetoshi Suzuki
秀俊 鈴木
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Panasonic Corp
パナソニック株式会社
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Abstract

PROBLEM TO BE SOLVED: To prevent an unexpected operation from being performed in a communication terminal device caused by an existing base station incapable of interpreting an extended signaling signal starting a function that is not supported by a handover destination of a communication terminal device, while enabling a base station capable of interpreting the extended signaling signal to determine whether a certain function is supported when existing within the cell of a first communication system, and whether it is supported when existing within the cell of a second communication system.SOLUTION: A transmission part 103 transmits an existing signaling signal and an extended signaling signal. A signaling generation part 102 generates an existing signaling signal and an extended signaling signal, where the former includes the fact of not supporting a handover and reports a Capa for FDD, and the latter includes the fact of supporting or not supporting the handover and reports a Capa for TDD.

Description

  The present invention relates to a communication terminal apparatus and a signaling method for performing handover in, for example, an LTE (Long Term Evolution) system.

  Conventionally, in LTE, communication methods different between FDD and TDD have been defined. A cell used in the LTE system corresponds to one of FDD and TDD. Communication terminal devices used in the LTE system include models that support either FDD or TDD, or both FDD and TDD. In LTE, handover between cells using different communication methods between FDD and TDD is an implementation option function for communication terminal devices compatible with the LTE system (for example, Non-Patent Document 1 and Non-Patent Document 2). In the following description, handover means inter-mode Handover, which is a handover between cells using different communication methods of FDD and TDD.

  A communication terminal device used in the LTE system has a capability (ie, UE capability or UE-EUTRA-Capability: hereinafter referred to as “Capa”) corresponding to a function that is not supported and a function that is not supported (that is, the communication terminal device). To the base station. At this time, the communication terminal apparatus signals as Capa whether or not it supports either FDD or TDD, or both FDD and TDD, and whether it supports handover. More specifically, signaling is performed using a feature Group Indicators (FGI) field in Capa information. Here, many of the functions defined in the LTE system are defined as operations of the communication terminal apparatus and the base station in both FDD and TDD. However, when a communication terminal device notifies whether or not it corresponds to a certain function by using Capa, it corresponds to whether or not it corresponds when located in an FDD cell, or when located in a TDD cell. Whether or not it is possible to distinguish and signal.

  FIG. 1 is a diagram illustrating a conventional handover method.

  As shown in FIG. 1, the communication terminal apparatus 1 that conventionally supports both FDD and TDD signals the corresponding function to the base station 2 as Capa # 10. The base station 2 determines a function to be activated in the FDD cell of the base station 2 based on the signaled Capa # 10 and instructs the communication terminal apparatus 1. At the time of handover, Capa is taken over between base stations, and the base station 3 that is the handover destination base station determines a function to be activated in the handover destination cell based on Capa # 10 signaled to the base station 2. The communication terminal apparatus 1 is instructed through the base station 2.

  When the communication terminal device 1 supports only a certain function in FDD and does not support it in TDD, there are two possible methods: a case where the function is signaled as compatible in Capa # 10 and a case where the function is signaled as non-compatible. . When signaling that the function is not supported, there is a problem that the function is not activated in the cell of the base station 2 and the capability of the communication terminal apparatus 1 cannot be fully utilized. When signaling that the function is supported, when the base station 3 issues a handover instruction via the base station 2, the communication terminal apparatus 1 activates the function not supported in TDD, and the communication terminal apparatus 1 performs an unexpected operation. There is a problem.

  In order to solve such a problem, conventionally, a technique for signaling Capa using signaling obtained by extending existing signaling in addition to existing signaling is known (for example, Non-Patent Document 3). As a result, the communication terminal apparatus performs signaling for distinguishing whether a function corresponds to whether or not it corresponds when it exists in the FDD cell, or whether or not it corresponds to when it exists in the TDD cell. be able to. As a result, the base station can activate a function that is not supported by the handover destination and prevent the communication terminal apparatus from performing an unexpected operation. In the following description, what notifies Capa by existing signaling is described as “existing signaling signal”, and what notifies Capa by extended signaling is described as “extended signaling signal”.

3GPP TS 36.331 V9.8.0 (2011-09) 3GPP TS 36.300 V9.8.0 (2011-09) 3GPP TSG-RAN2 Meeting # 76 Tdoc R2-116557

  However, in Non-Patent Document 3, the communication terminal device corresponding to the transmission of the extended signaling signal is connected to an existing base station that is not supposed to receive the extended signaling and transmits the extended signaling signal. Extended signaling signals are not considered at the base station. As a result, although the communication terminal apparatus transmits an extended signaling signal, the base station activates a function that is not supported by the handover destination, and the communication terminal apparatus operates unexpectedly. There is.

  An object of the present invention is to determine whether or not a base station capable of interpreting an extended signaling signal corresponds to a certain function when located in a cell of the first communication scheme, and a cell of the second communication scheme The existing base station that cannot interpret the extended signaling signal while activating the function that is not supported at the handover destination of the communication terminal device, can distinguish whether or not to respond to the presence of It is an object of the present invention to provide a communication terminal device and a signaling method that can prevent the terminal device from operating unexpectedly.

  The communication terminal apparatus according to the present invention includes: a generating unit that generates an existing signaling signal that reports its capability; an extended signaling signal that is an extension of the existing signaling signal; and the existing signaling signal and the extended signaling that are generated by the generating unit. A transmission means for transmitting a signal; a handover execution means for performing the handover when receiving a handover instruction from the first cell using the first communication system to the second cell using the second communication system; And the generation means includes not supporting the handover and notifying the existing signaling signal notifying the capability of the first communication method and not corresponding to the handover. And the extension for notifying one's ability in the second communication method. A configuration for generating and signaling signals.

  Further, the communication terminal apparatus of the present invention includes a generation unit that generates an existing signaling signal that reports its capability and an extended signaling signal that is an extension of the existing signaling signal, the existing signaling signal that is generated by the generation unit, and the Performing handover when receiving a handover instruction from a first cell that uses the first communication scheme to a second cell that uses the second communication scheme, and transmission means that transmits an extended signaling signal And receiving means for receiving the transmission permission notification of the extended signaling signal, wherein the generating means receives the transmission permission notification by the receiving means and the first communication method and the first communication method. The existing signaling signal for notifying one's ability in any one of the two communication methods, the first communication method, A configuration for generating said extended signaling signal notifying their abilities in the other of the second communication method.

  The signaling method of the present invention includes a generation step of generating an existing signaling signal that notifies its own capability and an extended signaling signal obtained by extending the existing signaling signal, and the existing signaling signal and the extended signaling signal generated by the generating step. A transmitting step for transmitting the information, wherein the generating step includes not being compatible with handover, and is not compatible with the handover and the existing signaling signal for notifying its own capability in the first communication scheme. The extended signaling signal including the presence or correspondence and notifying the user's ability in the second communication method is generated.

  Further, the signaling method of the present invention includes a generation step of generating an existing signaling signal notifying its own capability and an extended signaling signal obtained by extending the existing signaling signal, and the existing signaling signal generated by the generating step and the extension A transmission step of transmitting a signaling signal; and a reception step of receiving a transmission permission notification of the extended signaling signal, wherein the generation step includes a first step when receiving the transmission permission notification by the receiving step. The existing signaling signal for notifying one's ability in either one of the communication method and the second communication method, and one's ability in either one of the first communication method and the second communication method. The extended signaling signal to be notified is generated.

  According to the present invention, whether or not a base station capable of interpreting an extended signaling signal supports a certain function when located in a cell of the first communication scheme, and the cell of the second communication scheme The existing base station that cannot interpret the extended signaling signal while activating the function that is not supported at the handover destination of the communication terminal device, can distinguish whether or not to respond to the presence of It is possible to prevent the terminal device from operating unexpectedly.

Diagram showing a conventional handover method The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 1 of this invention. FIG. 3 is a flowchart showing a signaling method according to Embodiment 1 of the present invention; The figure which shows the communication system in Embodiment 1 of this invention. The flowchart which shows operation | movement of the base station which can interpret the extended signaling signal in Embodiment 1 of this invention The flowchart which shows operation | movement of the existing base station which cannot interpret the extended signaling signal in Embodiment 1 of this invention The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 2 of this invention. Flow chart showing a signaling method according to Embodiment 2 of the present invention. The flowchart which shows operation | movement of the base station in Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment of the present invention, a case where FDD and TDD are used as different communication methods used by each cell will be described as an example.

(Embodiment 1)
<Configuration of communication terminal device>
The configuration of communication terminal apparatus 100 according to Embodiment 1 of the present invention will be described using FIG. FIG. 2 is a block diagram showing a configuration of communication terminal apparatus 100 according to the present embodiment.

  The storage unit 101 stores in advance its own ability for each communication method.

  The signaling generation unit 102 refers to its own capability stored in the storage unit 101 and determines whether or not it corresponds to each parameter used when executing each function. The signaling generation unit 102 generates Capa including the determination result for each parameter. At this time, the signaling generation unit 102 includes the existing signaling signal for notifying the Capa of the communication terminal apparatus 100 in either one of FDD and TDD used in the cell to which the communication terminal apparatus 100 currently belongs, and the communication terminal apparatus 100 currently belongs. An extended signaling signal for notifying Capa of communication terminal apparatus 100 in either one of FDD and TDD used in a non-cell is generated. The signaling generation unit 102 includes a notification that does not support handover in a fixed manner in the existing signaling signal, and also includes a notification that supports handover or a notification that does not support handover in the extended signaling signal. The signaling generation unit 102 outputs the generated existing signaling signal and the extended signaling signal to the transmission unit 103. The existing signaling signal and the extended signaling signal will be described later.

  The transmission unit 103 transmits the existing signaling signal and the extended signaling signal input from the signaling generation unit 102 toward the base station of the cell in which the communication terminal device 100 exists.

  The receiving unit 104 receives a signal instructing handover. Receiving section 104 outputs the received handover instruction signal to handover executing section 105.

  The handover execution unit 105 executes handover when a signal instructing handover is input from the reception unit 104.

<Signaling method>
A signaling method according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 3 is a flowchart showing a signaling method according to the present embodiment. FIG. 4 is a diagram showing a communication system 400 in the present embodiment. In the operation of communication terminal apparatus 100, cell S2 (second communication method) using TDD (second communication method) is transmitted from base station 401 of cell S1 (first cell) using FDD (first communication method). A case where it is determined whether or not to hand over to the base station 402 of the cell) will be described as an example.

  From FIG. 3, first, communication terminal apparatus 100 refers to its own capability for each parameter stored in storage section 101 in signaling generation section 102, and whether or not Capa is the same for FDD and TDD. Is determined (step ST301).

  When Capa of communication terminal apparatus 100 is the same between FDD and TDD (step ST301: YES), signaling generation section 102 includes a communication terminal apparatus in FDD that includes a notification corresponding to Handoba or a notification that is not compatible. 100 Capa are generated as existing signaling signals (step ST302).

  On the other hand, when Capa of communication terminal apparatus 100 is different between FDD and TDD (step ST301: NO), signaling generation unit 102 includes a communication terminal in FDD including a notification that is not compatible with a handover from FDD to TDD. Capa # 410 (see FIG. 4) of apparatus 100 is generated as an existing signaling signal (step ST303). As illustrated in FIG. 4, for example, the existing signaling signal # 410 notifies that all of Feature_a, Feature_b, and Feature_c are supported, and that FGI bit 30 does not support handover. Here, Feature_a, Feature_b, and Feature_c indicate parameters. In FIG. 4, in the existing signaling signal # 410 and the extended signaling signal # 411, “Yes” indicates that it is compatible, and “No” indicates that it is not compatible (not compatible). FGI bit 30 is the 30th bit of the featureGroupIndicators (FGI) field in the Capa information, and is a bit indicating whether or not a handover between FDD and TDD is possible.

  In addition, the signaling generation unit 102 generates a Capa of the communication terminal apparatus 100 in TDD including a notification corresponding to a handover from TDD to FDD or a notification that is not supported as an extended signaling signal # 411 (see FIG. 4) ( Step ST304). As shown in FIG. 4, for example, the extended signaling signal # 411 notifies that it corresponds to Feature_a and Feature_b and does not correspond to Feature_c, and that it corresponds to handover in FGI bit 30.

  Here, the notification by the FGI bit 30 of the extended signaling signal is a method of notifying the handover from FDD to TDD and the handover from TDD to FDD, and notifying whether or not the handover between different communication methods is supported. (Hereinafter referred to as “notification method 1”) or a method of notifying whether handover is supported by distinguishing between handover from FDD to TDD and hand-over from TDD to FDD (hereinafter referred to as “notification”). Any one of “method 2” can be employed. Extended signaling signal # 411 in FIG. 4 employs notification method 1.

  In FIG. 3, the order of processing in step ST303 and step ST304 may be reversed or simultaneous.

<Operation of base station capable of interpreting extended signaling signal>
The operation of the base station capable of interpreting the extended signaling signal in Embodiment 1 of the present invention will be described using FIG. 4 and FIG. FIG. 5 is a flowchart showing the operation of the base station capable of interpreting the extended signaling signal in the present embodiment. In the following description using FIG. 5, a case where the base station 401 is a base station of a cell using FDD will be described as an example.

  As shown in FIG. 5, first, the base station 401 determines whether or not a notification corresponding to the handover is included in the Capa of the received existing signaling signal (step ST501). That is, the base station 401 determines whether or not the FGI bit 30 of Capa is “Yes”.

  When the notification corresponding to the handover is included (step ST501: YES), the base station 401 determines that the Capa notified by the existing signaling signal is the same in the FDD and the TDD, and supports the handover. (Step ST502).

  On the other hand, when a notification not supporting handover is included (step ST501: NO), base station 401 determines whether or not an extended signaling signal has been received (step ST503).

  When the extended signaling signal is not received (step ST503: NO), the base station 401 determines that the Capa notified by the existing signaling is the same in FDD and TDD, and is not compatible with handover. Determination is made (step ST504).

  On the other hand, when the extended signaling signal is received (step ST503: YES), the base station 401 determines the Capa of the communication terminal apparatus 100 in FDD from the existing signaling signal (step ST505).

  Moreover, the base station 401 determines whether it corresponds to Capa and handover of the communication terminal apparatus 100 in TDD or not from the extended signaling signal (step ST506). In the case of the notification method 2, whether the communication terminal device 100 supports or does not support the handover from FDD to TDD by the extended signaling signal, the communication terminal device 100 performs the handover from TDD to FDD. It is determined by distinguishing whether it is compatible or not.

  In FIG. 5, the order of processing in step ST505 and step ST506 may be reversed or simultaneous.

<Operation of base station that cannot interpret extended signaling signal>
The operation of the existing base station that cannot interpret the extended signaling signal in Embodiment 1 of the present invention will be described using FIG. 4 and FIG. FIG. 6 is a flowchart showing the operation of an existing base station that cannot interpret the extended signaling signal in the present embodiment. In the following description using FIG. 6, a case where the base station 401 is a base station of a cell using FDD will be described as an example.

  As shown in FIG. 6, first, the base station 401 determines whether or not a notification corresponding to handover is included in the Capa of the received existing signaling signal (step ST601). That is, the base station 401 determines whether or not the FGI bit 30 of Capa is “Yes”.

  When the notification corresponding to the handover is included (step ST601: YES), the base station 401 has the same Capa notified by the existing signaling signal in the FDD and the TDD, and supports the handover. It determines with a thing (step ST602).

  On the other hand, when a notification not supporting handover is included (step ST601: NO), the base station 401 uses the same signaling for the existing signaling signal in FDD and TDD, and does not support handover. (Step ST603).

  As described above, since communication terminal apparatus 100 always includes a notification that does not support handover in the existing signaling signal, base station 401 always executes the process of step ST603. As a result, the base station 401 can prevent the communication terminal device 100 that cannot be handed over from erroneously instructing the handover.

<Effects of the present embodiment>
According to the present embodiment, whether or not a base station capable of interpreting an extended signaling signal supports a certain function when located in an FDD cell and when located in a TDD cell. The existing base station that cannot distinguish the extended signaling signal while enabling the distinction of whether or not it is compatible activates a function that is not supported at the handover destination of the communication terminal device, and the communication terminal device is unexpected It is possible to prevent the operation.

(Embodiment 2)
<Configuration of communication terminal device>
FIG. 7 is a block diagram showing a configuration of communication terminal apparatus 700 according to Embodiment 2 of the present invention. In the embodiment of the present invention, a case where FDD and TDD are used as different communication methods used by each cell will be described as an example.

  A communication terminal apparatus 700 shown in FIG. 7 adds a signaling extension availability determination unit 702 to the communication terminal apparatus 100 according to Embodiment 1 shown in FIG. 2 and has a reception unit 701 instead of the reception unit 104. In addition, a signaling generation unit 703 is provided instead of the signaling generation unit 102. In FIG. 7, parts having the same configuration as in FIG.

  The receiving unit 701 receives a signal instructing handover for the existing signaling signal and the extended signaling signal transmitted from the transmitting unit 103. The receiving unit 701 outputs a received instruction for handover to the handover performing unit 105. The receiving unit 701 receives a control signal transmitted from the base station and outputs the control signal to the signaling extension availability determination unit 702.

  The signaling extension availability determination unit 702 determines whether the control signal input from the reception unit 701 includes a notification of permission to transmit an extended signaling signal. The signaling extension usability determination unit 702 outputs the determination result to the signaling generation unit 703. Here, the transmission permission notification is a notification indicating that transmission of the extended signaling signal is permitted.

  The signaling generation unit 703 refers to its own ability stored in the storage unit 101 and determines whether or not it corresponds to each parameter used when executing each function. The signaling generation unit 703 generates Capa including the determination result for each parameter.

  When a determination result including a transmission permission notification is input from the signaling extension usability determination unit 702, the signaling generation unit 703 performs communication in one of FDD and TDD used in the cell to which the communication terminal device 700 currently belongs. An existing signaling signal for notifying the Capa of the terminal device 700 is generated. At this time, the signaling generation unit 703 includes, in the existing signaling signal, a notification that the communication terminal device 700 is compatible with a handover from one of FDD and TDD to the other, or a notification that is not compatible. Further, the signaling generation unit 703 generates an extended signaling signal for notifying the Capa of the communication terminal device 700 in either the FDD or TDD used in a cell to which the communication terminal device 700 does not currently belong. At this time, the signaling generation unit 703 includes, in the extended signaling signal, a notification that the communication terminal device 700 is compatible with a handover from one of FDD and TDD to the other, or a notification that is not supported.

  On the other hand, when a determination result that does not include a transmission permission notification is input from the signaling extension availability determination unit 702, the signaling generation unit 703 receives the Capa of the communication terminal device 100 in the communication scheme of the cell to which the communication terminal device 100 currently belongs. To generate an existing signaling signal. At this time, the signaling generation unit 703 includes a notification that does not support handover in a fixed manner in the existing signaling signal. The signaling generation unit 703 does not need to generate an extended signaling signal when a determination result that does not include a transmission permission notification is input from the signaling extended availability determination unit 702.

  Transmitting section 103 transmits the existing signaling signal or extended signaling signal input from signaling generating section 703 toward the base station of the cell where communication terminal apparatus 700 is present.

  The handover execution unit 105 executes handover when a signal instructing handover is input from the reception unit 701.

<Signaling method>
A signaling method according to Embodiment 2 of the present invention will be described using FIG. 4 and FIG. FIG. 8 is a flowchart showing a signaling method according to the present embodiment. 4 is the same as Embodiment 1 except that communication terminal apparatus 700 is used instead of communication terminal apparatus 100. Further, in the operation of the communication terminal device 700, the base station 401 of the cell S1 (first cell) using FDD (first communication method) to the cell S2 (second communication method) using TDD (second communication method). A case where it is determined whether or not to hand over to the base station 402 of the cell) will be described as an example.

  From FIG. 8, first, communication terminal apparatus 700 refers to its own capability for each parameter stored in storage section 101 in signaling generation section 703, and whether or not Capa is the same for FDD and TDD. Is determined (step ST801).

  When Capa of communication terminal apparatus 700 is the same between FDD and TDD (step ST801: YES), signaling generating section 703 includes a communication terminal apparatus in FDD that includes a notification corresponding to Handoba or a notification that is not compatible. 700 Capa is generated as an existing signaling signal (step ST802).

  On the other hand, when Capa of communication terminal apparatus 700 is different between FDD and TDD (step ST801: NO), signaling generation unit 703 determines whether or not there is a notification that an extended signaling signal may be transmitted (step ST1). ST803). That is, the signaling generation unit 703 determines whether a determination result including a transmission permission notification is input from the signaling extension availability determination unit 702.

  When there is no notification that the extended signaling signal may be transmitted (step ST803: NO), the signaling generation unit 703 uses the existing signaling to indicate the Capa of the communication terminal device 700 in FDD including a notification that does not support handover. It generates as a signal (step ST804).

  On the other hand, when there is a notification that the extended signaling signal may be transmitted (step ST803: YES), the signaling generation unit 703 provides a notification corresponding to a handover from FDD to TDD or a notification that is not compatible. In addition, Capa of communication terminal apparatus 700 in FDD is generated as an existing signaling signal (step ST805).

  In addition, signaling generation section 703 generates Capa of communication terminal apparatus 700 in TDD as an extended signaling signal including a notification corresponding to handover from TDD to FDD or a notification that is not compatible (step ST806).

  In the present embodiment, either the notification method 1 or the notification method 2 can be used for the notification that the handover is supported or not supported by FGI bit 30 of the extended signaling signal. In FIG. 8, the order of processing in step ST805 and step ST806 may be reversed or simultaneous.

<Operation of base station>
The operation of the base station in Embodiment 2 of the present invention will be described using FIG. 4 and FIG. FIG. 9 is a flowchart showing the operation of the base station in the present embodiment. Note that the base station shown in FIG. 9 is a base station that can interpret the extended signaling signal.

  From FIG. 9, first, the base station 401 transmits a transmission permission notification (step ST901).

  Next, base station 401 determines whether or not an extended signaling signal has been received (step ST902).

  When the extended signaling signal is not received (step ST902: NO), the base station 401 determines from the existing signaling that the FDD and TDD have the same Capa and are compatible with handover or not. (Step ST903).

  On the other hand, when the extended signaling signal is received (step ST902: YES), the base station 401 determines from the existing signaling signal that it corresponds to or does not support the handover from FDD to TDD, and FDD. Capa of communication terminal apparatus 700 is determined (step ST904).

  Also, base station 401 determines from the extended signaling signal that it corresponds to or does not support a handover from TDD to FDD, and determines the Capa of communication terminal apparatus 700 in TDD (step ST905).

<Effects of the present embodiment>
According to the present embodiment, whether or not a base station capable of interpreting an extended signaling signal supports a certain function when located in an FDD cell and when located in a TDD cell. The existing base station that cannot distinguish the extended signaling signal while enabling the distinction of whether or not it is compatible activates a function that is not supported at the handover destination of the communication terminal device, and the communication terminal device is unexpected It is possible to prevent the operation.

<Modification of Embodiment 2>
In the second embodiment, when the transmission permission notification is received, the existing signaling signal notifies the Capa in the communication scheme of the cell in which the current communication terminal apparatus exists, and the extended signaling signal notifies the Capa in the neighboring cell communication scheme. However, the present invention is not limited to this, and the Capa notified by the existing signaling signal and the extended signaling signal may be reversed.

  Further, in the second embodiment, the notification as to whether or not the extended signaling signal may be transmitted is transmitted from the base station as a transmission permission notification. However, the present invention is not limited to this, and the extended signaling signal is transmitted. The notification of whether or not it may be transmitted may be included in broadcast information or information transmitted when executing a connection procedure between the communication terminal device and the network. In this case, the communication terminal apparatus receives notification indicating whether or not to transmit the extended signaling signal included in the broadcast information or information transmitted when the communication terminal apparatus and the network are connected.

<Modification common to all embodiments>
In Embodiment 1 and Embodiment 2, handover is performed between FDD and TDD. However, the present invention is not limited to this, and handover may be performed between any different communication methods other than FDD and TDD.

  In the first and second embodiments, FGI bit 30 is used to notify that handover is supported or not supported. However, the present invention is not limited to this, and any other than FGI bit 30 can be used. Can be notified using any bit or signal.

  The communication terminal apparatus and signaling method according to the present invention are suitable for handover in an LTE system, for example.

100, 700 Communication terminal device 101 Storage unit 102, 703 Signaling generation unit 103 Transmission unit 104, 701 Receiving unit 105 Handover execution unit 401, 402 Base station 702 Signaling extension use availability determination unit

Claims (6)

  1. Generating means for generating an existing signaling signal notifying its own capability and an extended signaling signal obtained by extending the existing signaling signal;
    Transmitting means for transmitting the existing signaling signal and the extended signaling signal generated by the generating means;
    Handover executing means for performing the handover when receiving an instruction for handover from the first cell using the first communication method to the second cell using the second communication method;
    Comprising
    The generating means includes
    The existing signaling signal notifying the handover and notifying its own capability in the first communication method, and not supporting or corresponding to the handover and the second A communication terminal device that generates the extended signaling signal for notifying its own capability in the communication method.
  2. Generating means for generating an existing signaling signal notifying its own capability and an extended signaling signal obtained by extending the existing signaling signal;
    Transmitting means for transmitting the existing signaling signal generated by the generating means and the extended signaling signal;
    Handover executing means for performing the handover when receiving an instruction for handover from the first cell using the first communication method to the second cell using the second communication method;
    Receiving means for receiving notification of permission to transmit the extended signaling signal;
    Comprising
    The generating means includes
    When the transmission permission notification is received by the receiving means, the existing signaling signal for notifying one's ability in either one of the first communication method and the second communication method, and the first communication A communication terminal device that generates the extended signaling signal for notifying one's ability in either one of the system and the second communication system.
  3. The generating means includes
    3. The existing signaling signal for notifying the handover and notifying its own capability in the first communication method is generated when the receiving means does not receive the transmission permission notification. Communication terminal device.
  4. The generating means includes
    Notifying or not responding to the handover from the first cell to the second cell, and not supporting the handover from the second cell to the first cell The communication terminal device according to any one of claims 1 to 3, wherein the extended signaling signal that notifies that the communication is performed or corresponding is generated.
  5. A generation step of generating an existing signaling signal notifying its own capability and an extended signaling signal obtained by extending the existing signaling signal;
    A transmission step of transmitting the existing signaling signal and the extended signaling signal generated by the generation step;
    Comprising
    The generating step includes
    The second communication method includes not only the handover but also the existing signaling signal for notifying its own capability in the first communication method and the non-handling or corresponding to the handover. A signaling method for generating the extended signaling signal for notifying the user's own capability.
  6. A generation step of generating an existing signaling signal notifying its own capability and an extended signaling signal obtained by extending the existing signaling signal;
    Transmitting the existing signaling signal generated by the generating step and the extended signaling signal; and
    A reception step of receiving a transmission permission notification of the extended signaling signal;
    Comprising
    The generating step includes
    When the transmission permission notification is received in the receiving step, the existing signaling signal for notifying one's ability in either one of the first communication method and the second communication method, and the first communication method; A signaling method for generating the extended signaling signal for notifying one's ability in either one of the second communication methods.
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