WO2011099421A1 - Multiband wireless communication system and terminal apparatus - Google Patents

Multiband wireless communication system and terminal apparatus Download PDF

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Publication number
WO2011099421A1
WO2011099421A1 PCT/JP2011/052281 JP2011052281W WO2011099421A1 WO 2011099421 A1 WO2011099421 A1 WO 2011099421A1 JP 2011052281 W JP2011052281 W JP 2011052281W WO 2011099421 A1 WO2011099421 A1 WO 2011099421A1
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frequency band
base station
time frame
timing difference
frame synchronization
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PCT/JP2011/052281
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French (fr)
Japanese (ja)
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嘉孝 原
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三菱電機株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2685—Speed of convergence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Definitions

  • the present invention relates to a multiband wireless communication system that performs communication using a plurality of discontinuous frequency bands.
  • a wireless communication system In recent years, construction of a high-speed wireless communication system has been demanded due to high demand for high-speed communication. Further, with an increase in communication speed, a wireless communication system needs to use a wider frequency band, but there is a limit to a usable frequency band. Therefore, there is a demand for a technique for constructing one wireless communication system using a plurality of discontinuous frequency bands. Such a technique is called multi-aggregation in 3GPP (3rd Generation Partnership), and is disclosed in Non-Patent Document 1 below.
  • a wireless communication method using a plurality of discontinuous frequency bands is referred to as a multiband method.
  • the following cited document 1 discloses a method in which a base station apparatus assigns a frequency band to a terminal apparatus based on propagation characteristics and QoS (Quality of Service) in each frequency band as a conventional multiband system.
  • QoS Quality of Service
  • frequency bands suitable for the control channel and the communication channel are selected in consideration of the characteristics of propagation characteristics in the discrete frequency band.
  • Non-Patent Document 2 discloses a method in which a base station apparatus allocates as high a frequency band as possible to a terminal apparatus based on channel quality information of a plurality of frequency bands notified from the terminal apparatus. .
  • the terminal apparatus transmits data to the base station prior to data reception. It is necessary to establish time frame synchronization with the device. Therefore, in the terminal device, when trying to establish time frame synchronization individually for each frequency band, there is a problem that time synchronization control is required for each frequency band, and the amount of calculation processing increases. Further, the terminal device has a problem that a predetermined time is required until the time frame synchronization is established.
  • the present invention has been made in view of the above, and provides a multiband wireless communication system capable of reducing the amount of computation required for time frame synchronization processing and further reducing the time required for time frame synchronization. With the goal.
  • the present invention is a multiband wireless communication system including a base station apparatus and a terminal apparatus that perform communication using a plurality of discontinuous frequency bands
  • the base station apparatus generates timing difference information between a time frame of a predetermined frequency band and a time frame of another frequency band, and transmits the timing difference information to the terminal apparatus using the predetermined frequency band.
  • the terminal device establishes time frame synchronization with the base station device in the predetermined frequency band, and further, based on timing difference information received from the base station device, the terminal device in the other frequency band. Establishing time frame synchronization with the base station apparatus.
  • FIG. 1 is a diagram illustrating a configuration example of a multiband wireless communication system.
  • FIG. 2 is a diagram illustrating an example of an available frequency band.
  • FIG. 3 is a diagram illustrating a configuration example of a time frame.
  • FIG. 4 is a diagram illustrating a configuration example of a time frame.
  • FIG. 5 is a diagram for notifying timing difference information from the base station apparatus to the terminal apparatus.
  • FIG. 6 is a diagram illustrating a configuration example of a time frame.
  • FIG. 7 is a diagram illustrating a configuration example of a time frame.
  • FIG. 8 is a diagram illustrating a configuration example of a time frame.
  • FIG. 9 is a diagram showing an introduction scenario of the multiband method.
  • FIG. 10 is a diagram illustrating a state where two base station apparatuses individually transmit signals.
  • FIG. 11 is a diagram illustrating a configuration example of a time frame.
  • FIG. 1 is a diagram illustrating a configuration example of a multiband wireless communication system according to the present embodiment. Specifically, a transmission control unit 10 in a base station device and a terminal device included in the multiband wireless communication system It is a figure which shows each structural example of the reception control part 20 of. Moreover, FIG. 2 is a figure which shows an example of the frequency band which can be utilized in the multiband radio
  • the transmission control unit 10 of the base station apparatus includes a time frame difference management unit 11, a frequency band management unit 12, a signal generation unit 13, a frequency band f1 transmission unit 14, and a frequency band f2 transmission unit 15. And a frequency band f3 transmitter 16.
  • the time frame difference management unit 11 manages the timing difference occurring in the time frame of each frequency band.
  • the frequency band management unit 12 manages a plurality of frequency bands (f1, f2, f3) in a unified manner, and further grasps the current traffic state, the used frequency band of the terminal device, the channel quality, and the like. Further, when a communication request is received from a specific terminal device, frequency band allocation control (frequency allocation control) is performed based on the channel quality obtained from the terminal device. In addition, when the channel quality with the terminal device in communication deteriorates, the terminal device is notified of an appropriate change in the usage frequency after checking the overall usage state.
  • the signal generation unit 13 generates a control signal and a data signal, and transfers the generated signal to a predetermined transmission unit based on frequency allocation control by the frequency band management unit 12.
  • the frequency band f1 transmission part 14 transmits a control signal or a data signal to a terminal device using the frequency band f1.
  • the frequency band f2 transmission part 15 transmits a control signal or a data signal to a terminal device using the frequency band f2.
  • the frequency band f3 transmission unit 16 transmits a control signal or a data signal to the terminal device using the frequency band f3.
  • the reception control unit 20 of the terminal device includes a frequency band f1 reception unit 21, a frequency band f2 reception unit 22, a frequency band f3 reception unit 23, a signal detection extraction unit 24, and time frame synchronization establishment.
  • the signal detection and extraction unit 24 includes a signal detection unit 241 and a time frame difference extraction unit 242.
  • the frequency band f1 receiving unit 21 receives a control signal or a data signal of the frequency band f1.
  • the frequency band f2 receiving unit 22 receives a control signal or a data signal of the frequency band f2.
  • the frequency band f3 receiving unit 23 receives a control signal or a data signal of the frequency band f3.
  • the signal detector 241 detects control information or data from the received signal.
  • the time frame difference extraction unit 242 extracts timing frame information included in the control signals received by the reception units (21, 22, 23).
  • the time frame synchronization establishing unit 25 establishes time frame synchronization of each frequency band based on the information of the time frame timing difference.
  • the frequency band management unit 26 selects a reception unit that receives a signal based on the frequency band allocated by the frequency allocation control by the base station apparatus.
  • FIG. 3 is a diagram illustrating a configuration example of a basic time frame in the multiband method. It is a graph with the horizontal axis representing time and the vertical axis representing frequency.
  • the plurality of frequency bands (f1, f2) are time frame synchronized at the same timing.
  • the terminal apparatus if the terminal apparatus establishes time frame synchronization for one frequency band, the terminal apparatus automatically performs time even for signals existing in other frequency bands. Frame synchronization can be established. Accordingly, since it is not necessary for the terminal device to establish time frame synchronization for each frequency band individually, time frame synchronization processing can be reduced.
  • FIG. 4 is a diagram illustrating a configuration example of a basic time frame in the multiband method. As shown in FIG. 4, the time frame may be transmitted at different time timings depending on the frequency band. In such a case, even if the terminal device establishes time frame synchronization for one frequency band, the terminal device cannot automatically establish time frame synchronization for time frames of other frequency bands.
  • the base station apparatus notifies the terminal apparatus of information on the timing difference ⁇ t of time frames transmitted in a plurality of frequency bands.
  • FIG. 5 is a diagram for notifying information of the timing difference ⁇ t from the base station apparatus to the terminal apparatus by a control signal.
  • the base station apparatus notifies the information of the timing difference ⁇ t by the control signal separately from the data signal.
  • FIG. 6 is a diagram illustrating a configuration example of a basic time frame in the multiband method. This shows a state where the timing at the frequency f2 is delayed by ⁇ t.
  • the transmission control unit 10 of the base station apparatus notifies the signal generation unit 13 of information on the timing difference ⁇ t from the time frame difference management unit 11. Then, the signal generation unit 13 generates a control signal including information on the timing difference ⁇ t. And based on the instruction
  • FIG. 5 shows two cases as a plurality of frequency bands. For example, when there are five frequency bands (f1 to f5), the base station apparatus uses the frequency band f1 in the frequency band f1. Four pieces of information are notified to the terminal device as timing differences with the remaining four frequency bands (f2 to f5).
  • the signal detection unit 241 detects a control signal among the signals received by the predetermined reception unit, and the time frame difference extraction unit 242 extracts information on the timing difference ⁇ t from the control signal. . Then, the time frame synchronization establishing unit 25 establishes time frame synchronization based on the information of the timing difference ⁇ t.
  • the terminal device can automatically establish time frame synchronization for other frequency bands by using information on the timing difference ⁇ t. Specifically, the terminal device sets the timing shifted by the timing difference ⁇ t with respect to the established time frame synchronization timing as the time synchronization timing of another frequency band.
  • the terminal device When establishing time frame synchronization individually as in the prior art, the terminal device needs to detect a suitable timing from many possible time timings, and thus requires a large amount of computation and search time. In the present embodiment, since the terminal device does not establish time frame synchronization individually for each frequency band, the processing amount required for time frame synchronization can be reduced. Further, the time required for the time frame synchronization process can be reduced.
  • the information on the timing difference ⁇ t notified from the base station apparatus to the terminal apparatus may be notified by using any frequency band as long as the terminal apparatus can recognize the information. For example, when it is determined in advance that the terminal device first establishes time synchronization of the frequency band f1, the base station device notifies the information of the timing difference ⁇ t using the frequency band f1.
  • FIG. 7 is a diagram illustrating a configuration example of a basic time frame in the multiband method. This shows a state in which the information of the timing difference ⁇ t is included in the control signal of the frequency band f1.
  • the terminal apparatus After establishing the time frame synchronization of the frequency band f1, the terminal apparatus detects information on the timing difference ⁇ t notified from the base station apparatus in the frequency band f1. The terminal device can recognize the reception timing of the time frame in the frequency band f2 based on the information of the timing difference ⁇ t and the time timing in the frequency band f1. Therefore, the terminal device does not need to establish time frame synchronization independently in the frequency band f2.
  • FIG. 8 is a diagram illustrating a configuration example of a basic time frame in the multiband method. It shows a state in which information on timing differences from other frequency bands is included in control signals of a plurality of frequency bands.
  • the terminal device establishes time frame synchronization for a certain frequency band and receives a control signal notified in that frequency band even if the frequency band for establishing time synchronization is not determined first. By doing so, it is possible to know the timing difference of time frames transmitted in other frequency bands. Therefore, the terminal device can establish time frame synchronization without performing independent time frame synchronization processing for other frequency bands.
  • the base station apparatus notifies the timing difference ⁇ t of the time frame of the frequency band f2 with reference to the frequency band f1 in the frequency band f1.
  • the base station apparatus notifies the timing difference “ ⁇ t” of the time frame of the frequency band f1 with reference to the frequency band f2.
  • the base station apparatus notifies timing difference information in a format representing a relative time difference from other frequency bands with reference to the frequency band.
  • the base station apparatus includes a control signal in a certain frequency band including information on a timing difference between a time frame in the frequency band and a time frame in another frequency band. Notify the device.
  • the time frame synchronization can be established for other frequency bands based on the timing difference information included in the control signal.
  • FIG. 9 is a diagram showing an introduction scenario of the multiband method.
  • the existing systems A and B that were respectively operated in the frequency bands f1 and f2 are newly replaced with a new system (for example, LTE (Long Term Evolution) -Advanced standardized in 3GPP). Shows the case.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • the time used for the uplink and the time used for the downlink coincide with other systems of adjacent frequencies in order to reduce interference.
  • the new method When replacing an existing method with a new method in such an environment, it is desired that the new method also maintains the same time frame timing as the existing method.
  • the time frame timing cannot be made the same by the frequency bands f1 and f2. For this reason, in the multiband method, there are cases where it is necessary to transmit time frames at different time timings for each frequency band.
  • the present invention is not limited to this, and any radio station may be used.
  • the plurality of frequency bands may be continuous bands or discontinuous bands.
  • the “time frame” shown in the present embodiment can be applied to any radio resource that requires time synchronization, such as “time slot”, “subframe”, “time symbol”, and “time sample”. .
  • Embodiment 2 FIG. In Embodiment 1, the case where one base station apparatus transmits signals from a plurality of frequency bands has been described. In this embodiment, a case will be described in which two base station apparatuses individually transmit signals in different frequency bands. A different part from Embodiment 1 is demonstrated.
  • FIG. 10 is a diagram illustrating a state in which the two base station apparatuses A and B individually transmit signals in the frequency bands f1 and f2, respectively. At this time, the base station apparatus A notifies the terminal apparatus of information on the timing difference ⁇ t by a control signal.
  • FIG. 11 is a diagram illustrating a configuration example of a basic time frame in the multiband method. This shows a state in which the timing of the time frame in the frequency band f2 used by the base station apparatus B is delayed by ⁇ t from the time frame of the frequency band f1 used by the base station apparatus A.
  • the terminal apparatus establishes time frame synchronization for the frequency band f1 used for communication with the base station apparatus A, and further receives the frequency band f2 received from the base station apparatus A. And time timing synchronization is also established for the frequency band f2.
  • the delay time is related to the time frame of the frequency band f2 transmitted from the base station apparatus B even if the time timing synchronization is established for the frequency band f1.
  • a differential timing error occurs.
  • the terminal device needs to perform time frame synchronization processing in the frequency band f2, but it is possible to search by limiting the timing of the time frame to the error range of the delay time difference.
  • the terminal device needs to search all the time timings.
  • the terminal device receives notification of timing difference information, when performing time frame synchronization processing, the range for performing timing search can be narrowed, and the amount of time synchronization processing can be reduced.
  • the terminal apparatus receives the timing difference information received from one of the base station apparatuses. Can be used.
  • the terminal device when the terminal device communicates with a plurality of base station devices using different frequency bands, the terminal device is used with one base station device.
  • Time frame synchronization is established in a certain frequency band, and further, a search is performed within the timing difference range using information on the timing difference received from a base station apparatus communicating in the frequency band.
  • time frame synchronization in other frequency bands is established. Thereby, in the terminal device, the amount of time synchronization processing can be reduced.
  • the multiband wireless communication system according to the present invention is useful for a wireless communication system including a base station device and a terminal device, and is particularly suitable when the terminal device establishes time frame synchronization. Yes.

Abstract

Provided is a multiband wireless communication system that exhibits a reduced amount of calculation required for a time frame synchronization process and hence exhibits a reduced time required for the time frame synchronization. The multiband wireless communication system is constituted by a base station apparatus and a terminal apparatus that use a plurality of discontinuous frequency bands to communicate with each other. The base station apparatus generates information of a timing difference between the time frame of a given frequency band and the time frame of another frequency band, and uses the given frequency band to transmit the information of the timing difference to the terminal apparatus. The terminal apparatus establishes a synchronization of time frame with the base station apparatus in the given frequency band, and further establishes, based on the information of the timing difference received from the base station apparatus, a synchronization of time frame with the base station apparatus in the other frequency band.

Description

マルチバンド無線通信システムおよび端末装置Multiband wireless communication system and terminal device
　本発明は、不連続な複数の周波数帯を用いて通信を行うマルチバンド無線通信システムに関する。 The present invention relates to a multiband wireless communication system that performs communication using a plurality of discontinuous frequency bands.
　近年、高速通信への高い需要により高速無線通信システムの構築が求められている。また、通信の高速化に伴い、無線通信システムは、より広い周波数帯域の利用が必要であるが、利用できる周波数帯域には限界がある。そのため、不連続な複数の周波数帯を用いて一つの無線通信システムを構築する技術が求められている。このような技術は、３ＧＰＰ（3rd　Generation　Partnership）ではマルチアグリゲーションと呼ばれており、下記非特許文献１において開示されている。なお、以降、不連続な複数の周波数帯を用いる無線通信方式をマルチバンド方式とよぶ。 In recent years, construction of a high-speed wireless communication system has been demanded due to high demand for high-speed communication. Further, with an increase in communication speed, a wireless communication system needs to use a wider frequency band, but there is a limit to a usable frequency band. Therefore, there is a demand for a technique for constructing one wireless communication system using a plurality of discontinuous frequency bands. Such a technique is called multi-aggregation in 3GPP (3rd Generation Partnership), and is disclosed in Non-Patent Document 1 below. Hereinafter, a wireless communication method using a plurality of discontinuous frequency bands is referred to as a multiband method.
　たとえば、下記引用文献１には、従来のマルチバンド方式として、基地局装置が、各周波数帯における伝搬特性およびＱｏＳ（Quality　of　Service）に基づいて、端末装置に対して周波数帯域を割り当てる方法が開示されている。ここでは、離散周波数帯における伝播特性の特徴を考慮して制御チャネルおよび通信チャネルに適した周波数帯を選定している。 For example, the following cited document 1 discloses a method in which a base station apparatus assigns a frequency band to a terminal apparatus based on propagation characteristics and QoS (Quality of Service) in each frequency band as a conventional multiband system. Has been. Here, frequency bands suitable for the control channel and the communication channel are selected in consideration of the characteristics of propagation characteristics in the discrete frequency band.
　また、下記非特許文献２には、基地局装置が、端末装置から通知される複数の周波数帯のチャネル品質情報に基づいて、端末装置に対してできるだけ高い周波数帯域を割り当てる方法が開示されている。 Non-Patent Document 2 below discloses a method in which a base station apparatus allocates as high a frequency band as possible to a terminal apparatus based on channel quality information of a plurality of frequency bands notified from the terminal apparatus. .
特開２００６－０９４００１号公報JP 2006-094001 A
　しかしながら、上記従来の技術によれば、マルチバンド方式では、基地局装置が端末装置に対してさまざまな周波数帯でデータを送信する可能性があるため、端末装置は、データ受信に先立って基地局装置との時間フレーム同期を確立する必要がある。そのため、端末装置では、周波数帯ごとに個別に時間フレーム同期を確立しようとすると、周波数帯域ごとに時間同期制御が必要となり、演算処理量が増加する、という問題があった。また、端末装置において、時間フレーム同期を確立するまでに所定の時間が必要となる、という問題があった。 However, according to the above-described conventional technique, in the multiband method, since the base station apparatus may transmit data in various frequency bands to the terminal apparatus, the terminal apparatus transmits data to the base station prior to data reception. It is necessary to establish time frame synchronization with the device. Therefore, in the terminal device, when trying to establish time frame synchronization individually for each frequency band, there is a problem that time synchronization control is required for each frequency band, and the amount of calculation processing increases. Further, the terminal device has a problem that a predetermined time is required until the time frame synchronization is established.
　本発明は、上記に鑑みてなされたものであって、時間フレーム同期処理に要する演算量を削減し、さらに、時間フレーム同期に要する時間を低減することが可能なマルチバンド無線通信システムを得ることを目的とする。 The present invention has been made in view of the above, and provides a multiband wireless communication system capable of reducing the amount of computation required for time frame synchronization processing and further reducing the time required for time frame synchronization. With the goal.
　上述した課題を解決し、目的を達成するために、本発明は、不連続な複数の周波数帯を用いて通信を行う基地局装置および端末装置から構成されるマルチバンド無線通信システムであって、前記基地局装置は、所定の周波数帯の時間フレームと他の周波数帯の時間フレームとのタイミング差の情報を生成し、当該タイミング差の情報を当該所定の周波数帯を用いて前記端末装置に送信し、前記端末装置は、前記所定の周波数帯において前記基地局装置と時間フレームの同期を確立し、さらに、前記基地局装置から受信したタイミング差の情報に基づいて、前記他の周波数帯において前記基地局装置と時間フレームの同期を確立する、ことを特徴とする。 In order to solve the above-described problems and achieve the object, the present invention is a multiband wireless communication system including a base station apparatus and a terminal apparatus that perform communication using a plurality of discontinuous frequency bands, The base station apparatus generates timing difference information between a time frame of a predetermined frequency band and a time frame of another frequency band, and transmits the timing difference information to the terminal apparatus using the predetermined frequency band. The terminal device establishes time frame synchronization with the base station device in the predetermined frequency band, and further, based on timing difference information received from the base station device, the terminal device in the other frequency band. Establishing time frame synchronization with the base station apparatus.
　本発明によれば、時間フレーム同期処理に要する演算量を削減し、時間フレーム同期に要する時間を低減することができる、という効果を奏する。 According to the present invention, it is possible to reduce the amount of calculation required for time frame synchronization processing and reduce the time required for time frame synchronization.
図１は、マルチバンド無線通信システムの構成例を示す図である。FIG. 1 is a diagram illustrating a configuration example of a multiband wireless communication system. 図２は、利用可能な周波数帯の一例を示す図である。FIG. 2 is a diagram illustrating an example of an available frequency band. 図３は、時間フレームの構成例を示す図である。FIG. 3 is a diagram illustrating a configuration example of a time frame. 図４は、時間フレームの構成例を示す図である。FIG. 4 is a diagram illustrating a configuration example of a time frame. 図５は、基地局装置から端末装置へタイミング差の情報を通知する図である。FIG. 5 is a diagram for notifying timing difference information from the base station apparatus to the terminal apparatus. 図６は、時間フレームの構成例を示す図である。FIG. 6 is a diagram illustrating a configuration example of a time frame. 図７は、時間フレームの構成例を示す図である。FIG. 7 is a diagram illustrating a configuration example of a time frame. 図８は、時間フレームの構成例を示す図である。FIG. 8 is a diagram illustrating a configuration example of a time frame. 図９は、マルチバンド方式の導入シナリオを示す図である。FIG. 9 is a diagram showing an introduction scenario of the multiband method. 図１０は、２つの基地局装置が個別に信号を送信する様子を示す図である。FIG. 10 is a diagram illustrating a state where two base station apparatuses individually transmit signals. 図１１は、時間フレームの構成例を示す図である。FIG. 11 is a diagram illustrating a configuration example of a time frame.
　以下に、本発明にかかるマルチバンド無線通信システムの実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, an embodiment of a multiband wireless communication system according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
実施の形態１．
　図１は、本実施の形態のマルチバンド無線通信システムの構成例を示す図であり、詳細には、マルチバンド無線通信システムに含まれる、基地局装置内の送信制御部１０と、端末装置内の受信制御部２０の、それぞれの構成例を示す図である。また、図２は、本実施の形態のマルチバンド無線通信システムにおいて利用可能な周波数帯の一例を示す図である。本実施の形態では、一例として、ｆ１とｆ２とｆ３の不連続な３つの周波数帯を利用する。各周波数帯ｆ１，ｆ２，ｆ３の大きさは、ｆ１＜ｆ２＜ｆ３の関係を有することとする。なお、図２では離散的な周波数帯を表しているが、周波数帯は互いに隣接していてもよい。また、周波数帯の数は２つ以上のいかなる値であっても構わない。 Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration example of a multiband wireless communication system according to the present embodiment. Specifically, a transmission control unit 10 in a base station device and a terminal device included in the multiband wireless communication system It is a figure which shows each structural example of the reception control part 20 of. Moreover, FIG. 2 is a figure which shows an example of the frequency band which can be utilized in the multiband radio | wireless communications system of this Embodiment. In this embodiment, as an example, three discontinuous frequency bands of f1, f2, and f3 are used. The magnitudes of the frequency bands f1, f2, and f3 have a relationship of f1 <f2 <f3. Although FIG. 2 shows discrete frequency bands, the frequency bands may be adjacent to each other. Further, the number of frequency bands may be any value of two or more.
　図１において、基地局装置の送信制御部１０は、時間フレーム差管理部１１と、周波数帯管理部１２と、信号生成部１３と、周波数帯ｆ１送信部１４と、周波数帯ｆ２送信部１５と、周波数帯ｆ３送信部１６と、を備える。 In FIG. 1, the transmission control unit 10 of the base station apparatus includes a time frame difference management unit 11, a frequency band management unit 12, a signal generation unit 13, a frequency band f1 transmission unit 14, and a frequency band f2 transmission unit 15. And a frequency band f3 transmitter 16.
　時間フレーム差管理部１１は、各周波数帯の時間フレームに生じているタイミング差を管理する。周波数帯管理部１２では、複数の周波数帯（ｆ１，ｆ２，ｆ３）を一元管理することとし、さらに、現在のトラヒック状態、端末装置の利用周波数帯、およびチャネル品質等を把握している。また、特定の端末装置から通信要求を受信した場合に、その端末装置から得られるチャネル品質に基づいて周波数帯の割り当て制御（周波数割り当て制御）を行う。また、通信中の端末装置とのチャネル品質が悪化した場合は、全体の利用状態を見たうえで、端末装置に対して適切な利用周波数の変更を通知する。信号生成部１３は、制御信号およびデータ信号を生成し、生成した信号を、周波数帯管理部１２による周波数割り当て制御に基づき所定の送信部へ転送する。周波数帯ｆ１送信部１４は、周波数帯ｆ１を使用して制御信号またはデータ信号を端末装置へ送信する。周波数帯ｆ２送信部１５は、周波数帯ｆ２を使用して制御信号またはデータ信号を端末装置へ送信する。周波数帯ｆ３送信部１６は、周波数帯ｆ３を使用して制御信号またはデータ信号を端末装置へ送信する。 The time frame difference management unit 11 manages the timing difference occurring in the time frame of each frequency band. The frequency band management unit 12 manages a plurality of frequency bands (f1, f2, f3) in a unified manner, and further grasps the current traffic state, the used frequency band of the terminal device, the channel quality, and the like. Further, when a communication request is received from a specific terminal device, frequency band allocation control (frequency allocation control) is performed based on the channel quality obtained from the terminal device. In addition, when the channel quality with the terminal device in communication deteriorates, the terminal device is notified of an appropriate change in the usage frequency after checking the overall usage state. The signal generation unit 13 generates a control signal and a data signal, and transfers the generated signal to a predetermined transmission unit based on frequency allocation control by the frequency band management unit 12. The frequency band f1 transmission part 14 transmits a control signal or a data signal to a terminal device using the frequency band f1. The frequency band f2 transmission part 15 transmits a control signal or a data signal to a terminal device using the frequency band f2. The frequency band f3 transmission unit 16 transmits a control signal or a data signal to the terminal device using the frequency band f3.
　また、図１において、端末装置の受信制御部２０は、周波数帯ｆ１受信部２１と、周波数帯ｆ２受信部２２と、周波数帯ｆ３受信部２３と、信号検出抽出部２４と、時間フレーム同期確立部２５と、周波数帯管理部２６と、を備える。また、上記信号検出抽出部２４は、信号検出部２４１と、時間フレーム差抽出部２４２と、を備える。 In FIG. 1, the reception control unit 20 of the terminal device includes a frequency band f1 reception unit 21, a frequency band f2 reception unit 22, a frequency band f3 reception unit 23, a signal detection extraction unit 24, and time frame synchronization establishment. Unit 25 and frequency band management unit 26. The signal detection and extraction unit 24 includes a signal detection unit 241 and a time frame difference extraction unit 242.
　周波数帯ｆ１受信部２１は、周波数帯ｆ１の制御信号またはデータ信号を受信する。周波数帯ｆ２受信部２２は、周波数帯ｆ２の制御信号またはデータ信号を受信する。周波数帯ｆ３受信部２３は、周波数帯ｆ３の制御信号またはデータ信号を受信する。信号検出部２４１は、受信信号から制御情報またはデータを検出する。時間フレーム差抽出部２４２は、それぞれの受信部（２１，２２，２３）で受信した制御信号に含まれている時間フレームのタイミング差の情報を抽出する。時間フレーム同期確立部２５は、時間フレームのタイミング差の情報に基づいて、各周波数帯の時間フレームの同期を確立する。周波数帯管理部２６は、基地局装置による周波数割り当て制御によって割り当てられた周波数帯に基づいて、信号を受信する受信部を選択する。 The frequency band f1 receiving unit 21 receives a control signal or a data signal of the frequency band f1. The frequency band f2 receiving unit 22 receives a control signal or a data signal of the frequency band f2. The frequency band f3 receiving unit 23 receives a control signal or a data signal of the frequency band f3. The signal detector 241 detects control information or data from the received signal. The time frame difference extraction unit 242 extracts timing frame information included in the control signals received by the reception units (21, 22, 23). The time frame synchronization establishing unit 25 establishes time frame synchronization of each frequency band based on the information of the time frame timing difference. The frequency band management unit 26 selects a reception unit that receives a signal based on the frequency band allocated by the frequency allocation control by the base station apparatus.
　つづいて、マルチバンド無線通信システムにおける時間フレーム同期を確立する処理について説明する。本実施の形態では、複数の周波数帯において同じフレーム時間を有する方式を用いる場合に、時間フレーム同期を効率的に確立する方法について説明する。 Next, processing for establishing time frame synchronization in a multiband wireless communication system will be described. In this embodiment, a method for efficiently establishing time frame synchronization when using a method having the same frame time in a plurality of frequency bands will be described.
　図３は、マルチバンド方式における基本的な時間フレームの構成例を示す図である。横軸を時間、縦軸を周波数としたグラフで表したものである。複数の周波数帯（ｆ１，ｆ２）は、同じタイミングに時間フレーム同期されている。図３に示す時間フレーム構成を持つマルチバンド方式の場合、端末装置は、１つの周波数帯に対して時間フレーム同期を確立すれば、他の周波数帯に存在する信号に対しても自動的に時間フレーム同期を確立できる。従って、端末装置では、周波数帯ごとに個別に時間フレーム同期を確立する必要が無いため、時間フレーム同期処理を削減することができる。 FIG. 3 is a diagram illustrating a configuration example of a basic time frame in the multiband method. It is a graph with the horizontal axis representing time and the vertical axis representing frequency. The plurality of frequency bands (f1, f2) are time frame synchronized at the same timing. In the case of the multiband system having the time frame configuration shown in FIG. 3, if the terminal apparatus establishes time frame synchronization for one frequency band, the terminal apparatus automatically performs time even for signals existing in other frequency bands. Frame synchronization can be established. Accordingly, since it is not necessary for the terminal device to establish time frame synchronization for each frequency band individually, time frame synchronization processing can be reduced.
　しかしながら、複数の周波数帯の時間フレームは、必ずしも同じタイミングを持つとは限らない。図４は、マルチバンド方式における基本的な時間フレームの構成例を示す図である。図４に示すように、時間フレームは周波数帯によって異なる時間タイミングで送信される場合がある。このような場合、端末装置は、１つの周波数帯に対して時間フレーム同期を確立しても、他の周波数帯の時間フレームに対して自動的に時間フレーム同期を確立することができない。 However, time frames of a plurality of frequency bands do not necessarily have the same timing. FIG. 4 is a diagram illustrating a configuration example of a basic time frame in the multiband method. As shown in FIG. 4, the time frame may be transmitted at different time timings depending on the frequency band. In such a case, even if the terminal device establishes time frame synchronization for one frequency band, the terminal device cannot automatically establish time frame synchronization for time frames of other frequency bands.
　そこで、本実施の形態では、基地局装置が、複数の周波数帯で送信される時間フレームのタイミング差Δｔの情報を端末装置へ通知する。図５は、基地局装置から端末装置へ制御信号によってタイミング差Δｔの情報を通知する図である。このように、基地局装置は、データ信号とは別に、制御信号によってタイミング差Δｔの情報を通知する。図６は、マルチバンド方式における基本的な時間フレームの構成例を示す図である。周波数ｆ２におけるタイミングがΔｔだけ遅れている状態を示すものである。このとき、基地局装置の送信制御部１０では、時間フレーム差管理部１１から、タイミング差Δｔの情報を信号生成部１３へ通知する。そして、信号生成部１３は、タイミング差Δｔの情報を含んだ制御信号を生成する。そして、周波数帯管理部１２の指示に基づいて、所定の送信部から制御信号を送信する。 Therefore, in the present embodiment, the base station apparatus notifies the terminal apparatus of information on the timing difference Δt of time frames transmitted in a plurality of frequency bands. FIG. 5 is a diagram for notifying information of the timing difference Δt from the base station apparatus to the terminal apparatus by a control signal. Thus, the base station apparatus notifies the information of the timing difference Δt by the control signal separately from the data signal. FIG. 6 is a diagram illustrating a configuration example of a basic time frame in the multiband method. This shows a state where the timing at the frequency f2 is delayed by Δt. At this time, the transmission control unit 10 of the base station apparatus notifies the signal generation unit 13 of information on the timing difference Δt from the time frame difference management unit 11. Then, the signal generation unit 13 generates a control signal including information on the timing difference Δt. And based on the instruction | indication of the frequency band management part 12, a control signal is transmitted from a predetermined transmission part.
　なお、図５では複数の周波数帯として２つの場合を示しているが、例えば、周波数帯が５つ（ｆ１～ｆ５）であった場合、基地局装置は、周波数帯ｆ１において、周波数帯ｆ１と残りの４つの周波数帯（ｆ２～ｆ５）とのそれぞれのタイミング差として４つの情報を端末装置へ通知する。 FIG. 5 shows two cases as a plurality of frequency bands. For example, when there are five frequency bands (f1 to f5), the base station apparatus uses the frequency band f1 in the frequency band f1. Four pieces of information are notified to the terminal device as timing differences with the remaining four frequency bands (f2 to f5).
　端末装置の受信制御部２０では、所定の受信部において受信した信号のうち、信号検出部２４１において制御信号を検出し、時間フレーム差抽出部２４２が、制御信号からタイミング差Δｔの情報を抽出する。そして、時間フレーム同期確立部２５が、タイミング差Δｔの情報に基づいて、時間フレーム同期の確立を行う。これにより、端末装置では、１つの周波数帯で時間フレーム同期を確立する場合に、タイミング差Δｔの情報を用いることによって、他の周波数帯についても自動的に時間フレーム同期を確立できる。具体的に、端末装置は、確立された時間フレーム同期タイミングに対して、タイミング差Δｔだけずらしたタイミングを他の周波数帯の時間同期タイミングとする。 In the reception control unit 20 of the terminal device, the signal detection unit 241 detects a control signal among the signals received by the predetermined reception unit, and the time frame difference extraction unit 242 extracts information on the timing difference Δt from the control signal. . Then, the time frame synchronization establishing unit 25 establishes time frame synchronization based on the information of the timing difference Δt. As a result, when establishing time frame synchronization in one frequency band, the terminal device can automatically establish time frame synchronization for other frequency bands by using information on the timing difference Δt. Specifically, the terminal device sets the timing shifted by the timing difference Δt with respect to the established time frame synchronization timing as the time synchronization timing of another frequency band.
　従来のように個別に時間フレーム同期を確立する場合、端末装置では、多くの可能性の時間タイミングから適したタイミングを検出する必要があるため、多くの演算規模とサーチ時間が必要であった。本実施の形態では、端末装置は、周波数帯ごとに個別に時間フレーム同期を確立することがないため、時間フレーム同期に要する処理量を低減できる。また、時間フレーム同期処理に要する時間を削減できる。 When establishing time frame synchronization individually as in the prior art, the terminal device needs to detect a suitable timing from many possible time timings, and thus requires a large amount of computation and search time. In the present embodiment, since the terminal device does not establish time frame synchronization individually for each frequency band, the processing amount required for time frame synchronization can be reduced. Further, the time required for the time frame synchronization process can be reduced.
　なお、基地局装置から端末装置へ通知されるタイミング差Δｔの情報は、端末装置がその情報を認識できる限り、基地局装置は、どの周波数帯を用いて通知してもよい。例えば、端末装置において周波数帯ｆ１の時間同期を最初に確立することがあらかじめ決められている場合、基地局装置は、タイミング差Δｔの情報を、周波数帯ｆ１を用いて通知する。図７は、マルチバンド方式における基本的な時間フレームの構成例を示す図である。周波数帯ｆ１の制御信号にタイミング差Δｔの情報を含ませた状態を示すものである。 Note that the information on the timing difference Δt notified from the base station apparatus to the terminal apparatus may be notified by using any frequency band as long as the terminal apparatus can recognize the information. For example, when it is determined in advance that the terminal device first establishes time synchronization of the frequency band f1, the base station device notifies the information of the timing difference Δt using the frequency band f1. FIG. 7 is a diagram illustrating a configuration example of a basic time frame in the multiband method. This shows a state in which the information of the timing difference Δt is included in the control signal of the frequency band f1.
　この場合、端末装置は、周波数帯ｆ１の時間フレーム同期を確立した後、基地局装置から通知されたタイミング差Δｔの情報を、周波数帯ｆ１において検出する。端末装置は、このタイミング差Δｔの情報と周波数帯ｆ１における時間タイミングとに基づいて、周波数帯ｆ２における時間フレームの受信タイミングを認識することができる。そのため、端末装置では、周波数帯ｆ２において、独立して時間フレーム同期を確立する必要は無い。 In this case, after establishing the time frame synchronization of the frequency band f1, the terminal apparatus detects information on the timing difference Δt notified from the base station apparatus in the frequency band f1. The terminal device can recognize the reception timing of the time frame in the frequency band f2 based on the information of the timing difference Δt and the time timing in the frequency band f1. Therefore, the terminal device does not need to establish time frame synchronization independently in the frequency band f2.
　また、基地局装置では、１つの周波数帯の制御信号にタイミング差Δｔの情報を含ませるだけでなく、複数の周波数帯の制御信号に、他の周波数帯とのタイミング差Δｔの情報を含ませて通知することとしてもよい。図８は、マルチバンド方式における基本的な時間フレームの構成例を示す図である。複数の周波数帯の制御信号に、それぞれ他の周波数帯とのタイミング差の情報を含ませている状態を示すものである。 Further, in the base station apparatus, not only information on the timing difference Δt is included in the control signal of one frequency band, but also information on the timing difference Δt with respect to other frequency bands is included in the control signals of a plurality of frequency bands. May be notified. FIG. 8 is a diagram illustrating a configuration example of a basic time frame in the multiband method. It shows a state in which information on timing differences from other frequency bands is included in control signals of a plurality of frequency bands.
　この場合、端末装置では、最初に時間同期を確立する周波数帯が決められていなくても、ある１つの周波数帯に対して時間フレーム同期を確立し、その周波数帯で通知された制御信号を受信することにより、他の周波数帯で送信される時間フレームのタイミング差を知ることができる。そのため、端末装置は、他の周波数帯に対して独立な時間フレーム同期処理を行わなくても、時間フレーム同期を確立することができる。 In this case, the terminal device establishes time frame synchronization for a certain frequency band and receives a control signal notified in that frequency band even if the frequency band for establishing time synchronization is not determined first. By doing so, it is possible to know the timing difference of time frames transmitted in other frequency bands. Therefore, the terminal device can establish time frame synchronization without performing independent time frame synchronization processing for other frequency bands.
　また、図８の場合では、基地局装置は、周波数帯ｆ１では周波数帯ｆ１を基準とした周波数帯ｆ２の時間フレームのタイミング差Δｔを通知する。一方、基地局装置は、周波数帯ｆ２では周波数帯ｆ２を基準とした周波数帯ｆ１の時間フレームのタイミング差「－Δｔ」を通知する。このように、周波数帯ｆ１、ｆ２では、それぞれ正負が逆転したタイミング差の値が制御信号として通知される。すなわち、基地局装置は、タイミング差の情報を、その周波数帯を基準とし、他の周波数帯との相対的な時間差を表す形式で通知する。 In the case of FIG. 8, the base station apparatus notifies the timing difference Δt of the time frame of the frequency band f2 with reference to the frequency band f1 in the frequency band f1. On the other hand, in the frequency band f2, the base station apparatus notifies the timing difference “−Δt” of the time frame of the frequency band f1 with reference to the frequency band f2. As described above, in the frequency bands f1 and f2, the value of the timing difference in which the sign is reversed is notified as the control signal. That is, the base station apparatus notifies timing difference information in a format representing a relative time difference from other frequency bands with reference to the frequency band.
　以上説明したように、本実施の形態では、基地局装置が、ある周波数帯の制御信号に、当該周波数帯の時間フレームと他の周波数帯の時間フレームとのタイミング差の情報を含ませて端末装置へ通知する。そして、端末装置では、ある周波数帯の時間フレーム同期を確立する際に、制御信号に含まれるタイミング差の情報に基づいて、他の周波数帯についても時間フレーム同期の確立をすることができる。これにより、端末装置では、周波数帯ごとに独立に時間フレーム同期を確立する必要はないため、時間フレーム同期処理に要する演算量を削減し、時間フレーム同期に要する時間を低減することができる。さらに、演算量の削減により、必要な消費電力を抑えることが可能となる。 As described above, in the present embodiment, the base station apparatus includes a control signal in a certain frequency band including information on a timing difference between a time frame in the frequency band and a time frame in another frequency band. Notify the device. In the terminal device, when establishing the time frame synchronization of a certain frequency band, the time frame synchronization can be established for other frequency bands based on the timing difference information included in the control signal. Thereby, since it is not necessary for the terminal device to establish time frame synchronization independently for each frequency band, the amount of computation required for the time frame synchronization processing can be reduced, and the time required for time frame synchronization can be reduced. Furthermore, the required power consumption can be suppressed by reducing the amount of calculation.
　ここで、マルチバンド方式において、基地局装置が周波数帯ごとに異なる時間タイミングで時間フレームを送信することが必要となる場合について説明する。 Here, a case will be described in which it is necessary for the base station apparatus to transmit a time frame at a different time timing for each frequency band in the multiband method.
　図９は、マルチバンド方式の導入シナリオを示す図である。図９に示す導入シナリオでは、周波数帯ｆ１，ｆ２でそれぞれ運用していた既存方式Ａ，Ｂを新たに新方式（例えば３ＧＰＰにおいて標準化の行われているＬＴＥ（Long　Term　Evolution）－Ａｄｖａｎｃｅｄ）に置き換える場合を示している。この場合、既存方式Ａ，Ｂは、これまで独立に運用されていたため、同じフレーム時間タイミングを持たない場合がある。また、既存方式を新方式に置き換える場合、既存方式と新方式で同じフレーム時間タイミングを維持する必要性が生じる場合がある。例えば、ＴＤＤ（Time　division　Duplex）方式では、上りリンクに用いる時間と下りリンクに用いる時間は干渉を低減するために隣接周波数の他のシステムとも一致させることが好ましい。このような環境で既存方式を新方式に置き換える場合、新方式も既存方式と同じ時間フレームタイミングを保持することが望まれる。 FIG. 9 is a diagram showing an introduction scenario of the multiband method. In the introduction scenario shown in FIG. 9, the existing systems A and B that were respectively operated in the frequency bands f1 and f2 are newly replaced with a new system (for example, LTE (Long Term Evolution) -Advanced standardized in 3GPP). Shows the case. In this case, since the existing systems A and B have been operated independently so far, they may not have the same frame time timing. In addition, when replacing an existing method with a new method, it may be necessary to maintain the same frame time timing in the existing method and the new method. For example, in the TDD (Time division Duplex) method, it is preferable that the time used for the uplink and the time used for the downlink coincide with other systems of adjacent frequencies in order to reduce interference. When replacing an existing method with a new method in such an environment, it is desired that the new method also maintains the same time frame timing as the existing method.
　既存方式Ａ，Ｂを新方式に置き換える導入シナリオでは、周波数帯ｆ１，ｆ２によって時間フレームタイミングを同じにすることができない。そのため、マルチバンド方式では、周波数帯ごとに異なる時間タイミングで時間フレームを送信することが必要となる場合が発生する。 In the introduction scenario in which the existing methods A and B are replaced with the new method, the time frame timing cannot be made the same by the frequency bands f1 and f2. For this reason, in the multiband method, there are cases where it is necessary to transmit time frames at different time timings for each frequency band.
　なお、本実施の形態では「基地局装置」および「端末装置」として表現したが、これに限定するものではなく、いかなる無線局であっても構わない。また、複数の周波数帯は連続帯域であっても不連続帯域であっても構わない。また、本実施の形態で示した「時間フレーム」は、「時間スロット」、「サブフレーム」、「時間シンボル」、「時間サンプル」など時間同期を必要とするいかなる無線リソースについても適用可能である。 In addition, although expressed as “base station apparatus” and “terminal apparatus” in the present embodiment, the present invention is not limited to this, and any radio station may be used. Further, the plurality of frequency bands may be continuous bands or discontinuous bands. Further, the “time frame” shown in the present embodiment can be applied to any radio resource that requires time synchronization, such as “time slot”, “subframe”, “time symbol”, and “time sample”. .
実施の形態２．
　実施の形態１では、１つの基地局装置が複数の周波数帯から信号を送信する場合について説明した。本実施の形態では、２つの基地局装置がそれぞれ異なる周波数帯で個別に信号を送信する場合について説明する。実施の形態１と異なる部分について説明する。 Embodiment 2. FIG.
In Embodiment 1, the case where one base station apparatus transmits signals from a plurality of frequency bands has been described. In this embodiment, a case will be described in which two base station apparatuses individually transmit signals in different frequency bands. A different part from Embodiment 1 is demonstrated.
　図１０は、２つの基地局装置Ａ，Ｂがそれぞれ周波数帯ｆ１，ｆ２で個別に信号を送信する様子を示す図である。このとき、基地局装置Ａから端末装置へ制御信号によってタイミング差Δｔの情報を通知する。図１１は、マルチバンド方式における基本的な時間フレームの構成例を示す図である。基地局装置Ｂが使用する周波数帯ｆ２における時間フレームのタイミングが、基地局装置Ａが使用する周波数帯ｆ１の時間フレームよりもΔｔだけ遅れている状態を示すものである。このような場合であっても、端末装置は、基地局装置Ａとの通信に使用している周波数帯ｆ１について時間フレーム同期を確立し、さらに、基地局装置Ａから通知を受けた周波数帯ｆ２とのタイミング差の情報を利用して、周波数帯ｆ２についても時間タイミング同期を確立する。 FIG. 10 is a diagram illustrating a state in which the two base station apparatuses A and B individually transmit signals in the frequency bands f1 and f2, respectively. At this time, the base station apparatus A notifies the terminal apparatus of information on the timing difference Δt by a control signal. FIG. 11 is a diagram illustrating a configuration example of a basic time frame in the multiband method. This shows a state in which the timing of the time frame in the frequency band f2 used by the base station apparatus B is delayed by Δt from the time frame of the frequency band f1 used by the base station apparatus A. Even in such a case, the terminal apparatus establishes time frame synchronization for the frequency band f1 used for communication with the base station apparatus A, and further receives the frequency band f2 received from the base station apparatus A. And time timing synchronization is also established for the frequency band f2.
　基地局装置Ａ，Ｂからの信号が遅延時間差を有する場合には、周波数帯ｆ１に対して時間タイミング同期を確立しても、基地局装置Ｂから送信された周波数帯ｆ２の時間フレームに関して遅延時間差分のタイミング誤差が発生する。この場合、端末装置が、周波数帯ｆ２における時間フレーム同期処理を行う必要が生じるが、時間フレームのタイミングを遅延時間差の誤差の範囲に絞ってサーチすることができる。これに対して、時間フレームのタイミング差の情報が制御信号で通知されない場合には、端末装置は、全ての時間タイミングをサーチする必要がある。そのため、端末装置は、タイミング差の情報の通知を受けていれば、時間フレーム同期処理を行うに際して、タイミングサーチを行う範囲を狭くでき、時間同期処理量を低減できる。このように、２つの基地局装置Ａ，Ｂがそれぞれ周波数帯ｆ１，ｆ２で個別に信号を送信する場合であっても、端末装置では、一方の基地局装置から通知を受けたタイミング差の情報を利用することができる。 When the signals from the base station apparatuses A and B have a delay time difference, the delay time is related to the time frame of the frequency band f2 transmitted from the base station apparatus B even if the time timing synchronization is established for the frequency band f1. A differential timing error occurs. In this case, the terminal device needs to perform time frame synchronization processing in the frequency band f2, but it is possible to search by limiting the timing of the time frame to the error range of the delay time difference. On the other hand, when the information on the timing difference of the time frame is not notified by the control signal, the terminal device needs to search all the time timings. Therefore, if the terminal device receives notification of timing difference information, when performing time frame synchronization processing, the range for performing timing search can be narrowed, and the amount of time synchronization processing can be reduced. As described above, even when the two base station apparatuses A and B transmit signals individually in the frequency bands f1 and f2, respectively, the terminal apparatus receives the timing difference information received from one of the base station apparatuses. Can be used.
　以上説明したように、本実施の形態では、端末装置が異なる周波数帯を用いて複数の基地局装置と通信を行っている場合に、端末装置は、１つの基地局装置との間で使用している周波数帯において時間フレーム同期を確立し、さらに、当該周波数帯で通信を行っている基地局装置から通知を受けたタイミング差の情報を利用し、当該タイミング差の範囲内でサーチを行うことによって、他の周波数帯の時間フレーム同期を確立することとした。これにより、端末装置では、時間同期の処理量を低減することができる。 As described above, in the present embodiment, when the terminal device communicates with a plurality of base station devices using different frequency bands, the terminal device is used with one base station device. Time frame synchronization is established in a certain frequency band, and further, a search is performed within the timing difference range using information on the timing difference received from a base station apparatus communicating in the frequency band. Thus, time frame synchronization in other frequency bands is established. Thereby, in the terminal device, the amount of time synchronization processing can be reduced.
　以上のように、本発明にかかるマルチバンド無線通信システムは、基地局装置と端末装置から構成される無線通信システムに有用であり、特に、端末装置が時間フレームの同期を確立する場合に適している。 As described above, the multiband wireless communication system according to the present invention is useful for a wireless communication system including a base station device and a terminal device, and is particularly suitable when the terminal device establishes time frame synchronization. Yes.
　１０　送信制御部
　１１　時間フレーム差管理部
　１２　周波数帯管理部
　１３　信号生成部
　１４　周波数帯ｆ１送信部
　１５　周波数帯ｆ２送信部
　１６　周波数帯ｆ３送信部
　２０　受信制御部
　２１　周波数帯ｆ１受信部
　２２　周波数帯ｆ２受信部
　２３　周波数帯ｆ３受信部
　２４　信号検出抽出部
　２４１　信号検出部
　２４２　時間フレーム差抽出部
　２５　時間フレーム同期確立部
　２６　周波数帯管理部 DESCRIPTION OF SYMBOLS 10 Transmission control part 11 Time frame difference management part 12 Frequency band management part 13 Signal generation part 14 Frequency band f1 transmission part 15 Frequency band f2 transmission part 16 Frequency band f3 transmission part 20 Reception control part 21 Frequency band f1 reception part 22 Frequency band f2 receiving unit 23 frequency band f3 receiving unit 24 signal detection extracting unit 241 signal detecting unit 242 time frame difference extracting unit 25 time frame synchronization establishing unit 26 frequency band managing unit

Claims (8)

  1. 　不連続な複数の周波数帯を用いて通信を行う基地局装置および端末装置から構成されるマルチバンド無線通信システムであって、
    　前記基地局装置は、所定の周波数帯の時間フレームと他の周波数帯の時間フレームとのタイミング差の情報を生成し、当該タイミング差の情報を当該所定の周波数帯を用いて前記端末装置に送信し、
    　前記端末装置は、前記所定の周波数帯において前記基地局装置と時間フレームの同期を確立し、さらに、前記基地局装置から受信したタイミング差の情報に基づいて、前記他の周波数帯において前記基地局装置と時間フレームの同期を確立する、
    　ことを特徴とするマルチバンド無線通信システム。     A multiband wireless communication system composed of a base station device and a terminal device that perform communication using a plurality of discontinuous frequency bands,
    The base station apparatus generates timing difference information between a time frame of a predetermined frequency band and a time frame of another frequency band, and transmits the timing difference information to the terminal apparatus using the predetermined frequency band. And
    The terminal apparatus establishes time frame synchronization with the base station apparatus in the predetermined frequency band, and further, based on timing difference information received from the base station apparatus, the base station in the other frequency band Establish time frame synchronization with the device,
    A multiband wireless communication system characterized by the above.
  2. 　前記端末装置において、最初に時間フレームの同期を確立する周波数帯が決まっている場合、
    　前記基地局装置は、前記所定の周波数帯を、前記端末装置が最初に時間フレームの同期を確立する周波数帯とする、
    　ことを特徴とする請求項１に記載のマルチバンド無線通信システム。     In the terminal device, when the frequency band for establishing the synchronization of the time frame is determined first,
    The base station apparatus sets the predetermined frequency band as a frequency band in which the terminal apparatus first establishes time frame synchronization.
    The multiband wireless communication system according to claim 1.
  3. 　前記基地局装置は、前記タイミング差の情報を複数の周波数帯を用いて前記端末装置に送信し、
    　前記端末装置は、前記複数の周波数帯のいずれかの周波数帯において前記基地局装置と時間フレームの同期を確立し、当該同期を確立した周波数帯で受信したタイミング差の情報に基づいて、前記他の周波数帯において前記基地局装置と時間フレームの同期を確立する、
    　ことを特徴とする請求項１に記載のマルチバンド無線通信システム。     The base station device transmits the timing difference information to the terminal device using a plurality of frequency bands,
    The terminal device establishes time frame synchronization with the base station device in any one of the plurality of frequency bands, and based on timing difference information received in the frequency band in which the synchronization is established, Establishing time frame synchronization with the base station apparatus in the frequency band of
    The multiband wireless communication system according to claim 1.
  4. 　不連続な複数の周波数帯を用いて通信を行う複数の基地局装置および１つの端末装置から構成されるマルチバンド無線通信システムであって、
    　前記端末装置が、１つの周波数帯を用いて１つの基地局装置と通信を行うことによって、複数の周波数帯を用いて複数の基地局装置と通信を行っている場合に、
    　各基地局装置は、前記端末装置との通信に用いている周波数帯の時間フレームと他の周波数帯の時間フレームとのタイミング差の情報を生成し、当該タイミング差の情報を当該端末装置との通信に用いている周波数帯を用いて前記端末装置に送信し、
    　前記端末装置は、いずれかの基地局装置と時間フレームの同期を確立し、さらに、当該同期を確立した基地局装置との通信に用いている周波数帯以外の他の周波数帯において、当該同期を確立した基地局装置から受信したタイミング差の情報に基づいて、当該タイミング差の範囲内で他の周波数帯のサーチを行って時間フレームの同期を確立する、
    　ことを特徴とするマルチバンド無線通信システム。     A multiband wireless communication system comprising a plurality of base station devices and one terminal device that communicate using a plurality of discontinuous frequency bands,
    When the terminal device communicates with a plurality of base station devices using a plurality of frequency bands by communicating with one base station device using a single frequency band,
    Each base station apparatus generates information on a timing difference between a time frame in a frequency band used for communication with the terminal apparatus and a time frame in another frequency band, and transmits the information on the timing difference with the terminal apparatus. Transmit to the terminal device using the frequency band used for communication,
    The terminal apparatus establishes time frame synchronization with any of the base station apparatuses, and further performs the synchronization in a frequency band other than the frequency band used for communication with the base station apparatus that has established the synchronization. Based on the timing difference information received from the established base station device, establish a time frame synchronization by searching for other frequency bands within the timing difference range,
    A multiband wireless communication system characterized by the above.
  5. 　前記基地局装置は、制御信号により前記タイミング差の情報を送信する、
    　ことを特徴とする請求項１～４のいずれか１つに記載のマルチバンド無線通信システム。     The base station device transmits information on the timing difference by a control signal.
    The multiband radio communication system according to any one of claims 1 to 4, wherein
  6. 　不連続な複数の周波数帯を用いて基地局装置と通信を行う端末装置であって、
    　周波数帯ごとに時間フレーム同期を確立する時間フレーム同期確立手段、
    　を備え、
    　前記基地局装置から、所定の周波数帯の時間フレームと他の周波数帯の時間フレームとのタイミング差の情報を、当該所定の周波数帯を用いて受信した場合に、
    　前記時間フレーム同期確立手段は、前記所定の周波数帯において前記基地局装置と時間フレームの同期を確立し、さらに、前記基地局装置から受信したタイミング差の情報に基づいて、前記他の周波数帯において前記基地局装置と時間フレームの同期を確立する、
    　ことを特徴とする端末装置。     A terminal device that communicates with a base station device using a plurality of discontinuous frequency bands,
    Time frame synchronization establishing means for establishing time frame synchronization for each frequency band;
    With
    When receiving information on the timing difference between a time frame of a predetermined frequency band and a time frame of another frequency band from the base station apparatus using the predetermined frequency band,
    The time frame synchronization establishing means establishes time frame synchronization with the base station apparatus in the predetermined frequency band, and further, based on timing difference information received from the base station apparatus, in the other frequency band Establishing time frame synchronization with the base station device;
    A terminal device characterized by that.
  7. 　前記基地局装置から、前記タイミング差の情報を複数の周波数帯を用いて受信した場合に、
    　前記時間フレーム同期確立手段は、前記複数の周波数帯のいずれかの周波数帯において前記基地局装置と時間フレームの同期を確立し、当該同期を確立した周波数帯で受信したタイミング差の情報に基づいて、前記他の周波数帯において前記基地局装置と時間フレームの同期を確立する、
    　ことを特徴とする請求項６に記載の端末装置。     When receiving the timing difference information from the base station device using a plurality of frequency bands,
    The time frame synchronization establishment means establishes time frame synchronization with the base station apparatus in any one of the plurality of frequency bands, and based on timing difference information received in the frequency band where the synchronization is established. Establishing time frame synchronization with the base station apparatus in the other frequency band,
    The terminal device according to claim 6.
  8. 　不連続な複数の周波数帯を用いて複数の基地局装置と通信を行う端末装置であって、
    　周波数帯ごとに時間フレーム同期を確立する時間フレーム同期確立手段、
    　を備え、
    　１つの周波数帯を用いて１つの基地局装置と通信を行うことによって、複数の周波数帯を用いて複数の基地局装置と通信を行い、各基地局装置から、自装置との通信に用いている周波数帯の時間フレームと他の周波数帯の時間フレームとのタイミング差の情報を、自装置との通信に用いている周波数帯を用いて受信した場合に、
    　前記時間フレーム同期確立手段は、いずれかの基地局装置と時間フレームの同期を確立し、さらに、当該同期を確立した基地局装置との通信に用いている周波数帯以外の他の周波数帯において、当該同期を確立した基地局装置から受信したタイミング差の情報に基づいて、当該タイミング差の範囲内で他の周波数帯のサーチを行って時間フレームの同期を確立する、
    　ことを特徴とする端末装置。     A terminal device that communicates with a plurality of base station devices using a plurality of discontinuous frequency bands,
    Time frame synchronization establishing means for establishing time frame synchronization for each frequency band;
    With
    By communicating with one base station apparatus using one frequency band, it communicates with a plurality of base station apparatuses using a plurality of frequency bands, and each base station apparatus uses it for communication with its own apparatus. When the information of the timing difference between the time frame of a certain frequency band and the time frame of another frequency band is received using the frequency band used for communication with the own device,
    The time frame synchronization establishing means establishes time frame synchronization with any of the base station devices, and further, in a frequency band other than the frequency band used for communication with the base station device that established the synchronization, Based on the timing difference information received from the base station apparatus that established the synchronization, search for other frequency bands within the timing difference range to establish time frame synchronization,
    A terminal device characterized by that.
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