JPH0690202A - Inter-base station frame synchronizing system - Google Patents

Inter-base station frame synchronizing system

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Publication number
JPH0690202A
JPH0690202A JP23915392A JP23915392A JPH0690202A JP H0690202 A JPH0690202 A JP H0690202A JP 23915392 A JP23915392 A JP 23915392A JP 23915392 A JP23915392 A JP 23915392A JP H0690202 A JPH0690202 A JP H0690202A
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JP
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Patent type
Prior art keywords
base station
frame
t2
time difference
t1
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23915392A
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Japanese (ja)
Inventor
Shuzo Kato
Masahiro Morikura
修三 加藤
正博 守倉
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Abstract

PURPOSE:To prevent the frame phases of all the base stations from drifting hourly by measuring the time difference of the frame phases at both base stations, and correcting a transmission timing so that the time difference can coincide with each other. CONSTITUTION:The time difference t1(n) of the frame phase measured at the base station BS1 and the time difference t2(n) measured at the base station BS2 simultaneously are transmitted on (n+1)th frames to an opposite base station, respectively. Each base station compares t1(n) with t2(n). For example, when relation t1(n)>t2(n) can be satisfied, it shows that the frame phase of the base station BS2 lags behind the base station BS1, and the base station BS1 applies no correction of the frame phase on an (n+2)th frame. Meanwhile, the base station BS2 also compares t1(n) with t2(n) simultaneously. Delay is corrected on the (n+2)th frame from relation t1(n)>t2(n), and an operation is performed so as to synchronize the frame phase of the base station BS2 with that of the base station BS1.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、TDMA(時分割多元接続)方式を用いた移動通信システムの、基地局間のT The present invention relates, TDMA (Time Division Multiple Access) scheme mobile communication system using, T between base station
DMAフレーム同期を、無線回線を用いて実現する方式に関し、特に、基地局間のフレーム位相の時間的なドリフトを防止し得る構成に係る。 The DMA frame synchronization relates scheme implemented by using radio channels, in particular, according to the configuration capable of preventing the temporal drift of the frame phase between base stations.

【0002】 [0002]

【従来の技術】TDMA方式を用いた移動通信システムの例を図3に示す。 An example of a mobile communication system using the Related Art TDMA scheme shown in FIG. 同図では複数の基地局が各々のゾーン内の携帯無線機とTDMA方式により、通信を行っている様子を示している。 In the same figure by the portable radio and the TDMA system in the plurality of base stations each zone shows how performing communications. 同図において1は無線ゾーンi、2は基地局i、3は無線ゾーンj、4は基地局j、 1 radio zone i, 2 is a base station i, 3 ​​is a radio zone j, 4 the base station j in this figure,
5,6は携帯無線機を表わしている。 5 and 6 represent the mobile radio.

【0003】ここで、i番目の基地局に注目して、従来技術によるフレーム同期確立過程について説明する。 [0003] Here, focusing on the i th base station, will be described prior art for the frame synchronization establishment process by. 自局のフレーム位相をt iとし、またj番目の基地局から受信されるフレーム位相をt j 、その受信信号レベルをP jとする。 The frame phase of the own station and t i, also the frame phase t j received from the j th base station and the received signal level P j. これらの量を基に従来方式では補正すべき位相量ΔT iを“数1”のように算出する。 These amounts in a conventional manner on the basis of the calculated as "number 1" the phase of [Delta] T i to be corrected.

【0004】 [0004]

【数1】 [Number 1]

【0005】ここで、Mは他局の数であり、ΔT ij =t [0005] Here, M is the number of other stations, ΔT ij = t
j −t i +2t Oである。 It is a j -t i + 2t O. このΔT iを用いて、i番目の基地局は自局の送信フレーム位相を補正する。 Using this [Delta] T i, i-th base station corrects the transmission frame phase of the local station. この場合、定数t Oを基地局間の伝搬距離に応じて正確に伝搬時間を推定する必要があり、もし、この値が正確でない場合には、基地局のフレーム位相が全体的にドリフトしてしまう。 In this case, it is necessary to estimate accurately the propagation time according constant t O the propagation distance between the base stations, if, when this value is not accurate, the frame phase of the base station is totally drift put away.

【0006】 [0006]

【発明が解決しようとする課題】従来の基地局間フレーム同期方式では、各基地局が自律分散的にフレーム同期を確立する場合に、各基地局間の距離が正確に推定できない場合には、上述のように、全基地局のフレーム位相が時間的にドリフトしてしまうという問題があった。 In THE INVENTION to be solved INVENTION Conventional inter-base-station frame synchronous system, when each base station establishes a distributed autonomous frame synchronization, if the distance between the base station can not accurately estimate the as described above, the frame phase of all the base stations there is a problem that time drift.

【0007】本発明は、上記問題点を解決するために成されたもので、各基地局間の正確な距離推定ができない場合でも、全基地局のフレーム位相が時間的にドリフトすることのない基地局間フレーム同期方式を提供することを目的としている。 [0007] The present invention has been made in order to solve the above problems, even if you can not accurate distance estimates between each base station, the frame phase of all the base stations not to temporally drift and its object is to provide a frame synchronization method between base stations.

【0008】 [0008]

【課題を解決するための手段】本発明によれば上記目的は、前記特許請求の範囲に記載された手段により達成される。 Means for Solving the Problems] This above object, according to the invention is achieved by means described in the scope of the appended claims.

【0009】すなわち、本発明は、Nゾーンの基地局から構成されるTDMA(時分割多元接続)方式を用いた移動通信システムの、基地局間のTDMAフレーム同期を無線回線を用いて実現する方式において、i番目(1 Accordingly, the present invention, a method implemented by using the mobile communication system using a TDMA (Time Division Multiple Access) system consists of a base station of N zones, a TDMA frame synchronization between the base station radio channels in, i-th (1
≦i≦N)の基地局で、j番目(1≦j≦N,j≠i) In ≦ i ≦ N) base stations, j-th (1 ≦ j ≦ N, j ≠ i)
の基地局からの受信フレーム位相時間差Δt ij =t j Reception frame phase time difference Delta] t ij from the base station of = t j +
ij −t i (但し、t iはi番目の基地局のフレーム位相、t jはj番目の基地局からのフレーム位相、T ijはi番目の基地局とj番目の基地局との伝搬遅延時間)を測定し、次にi番目の基地局はΔt ijを相手のj番目の基地局に送信し、各基地局ではフレーム位相の補正値Δ T ij -t i (where, t i is the i-th base station in frame phase, t j is the propagation of the j-th frame phase from the base station, T ij is the i-th base station and the j-th base station measuring the delay time), then the i-th base station transmits a Delta] t ij in the j-th base station of the other party, the correction value of the frame phase Δ in each base station
i =max(r i1 ,‥,r ii-1 ,r ii +1 ,‥,r iN T i = max (r i1, ‥, r ii-1, r ii +1, ‥, r iN)
/2(但し、max(a,b,‥,z)は、a,b, / 2 (where, max (a, b, ‥, z) is, a, b,
‥,zの中で最大のものを選ぶ演算、また、r ij =Δt ‥, operation selecting the largest of z, also, r ij = Δt
ji −Δt ij ,(i≠j))を計算し、i番目の基地局は補正値ΔT iを用いてフレーム送信タイミングを補正するように構成した基地局間フレーム同期方式である。 ji -.DELTA.t ij, is (i ≠ j)) was calculated, i-th base station configuration the inter-base-station frame synchronous system so as to correct the frame transmission timing by using the correction value [Delta] T i.

【0010】 [0010]

【作用】本発明においては互いの基地局で自局のフレーム位相と相手基地局からの受信フレーム位相の時間差を測定し、その時間差が両者で同一になるようにフレームの送信タイミングを補正する。 [Action] In the present invention measures the time difference of the received frame phase from frame phase and another base station of the own station at each other base station, the time difference is corrected transmission timing of the frame to be identical in both. そして、その時間差が同一になった場合に両基地局のフレーム位相が同期する。 The frame phases of the base station are synchronized if the time difference has become equal.

【0011】従って、本発明の基地局間フレーム同期方式では、各基地局間の距離を正確に推定する必要はなく、全基地局のフレーム位相は互いに同期し、かつ全体のフレーム位相のドリフトは生じない。 Accordingly, in the inter-base-station frame synchronous system of the present invention, it is not necessary to accurately estimate the distance between base stations, the frame phase of all base stations in synchronization with each other, and the drift of the entire frame phase It does not occur.

【0012】 [0012]

【実施例】以下、図面にもとづいて本発明の実施例について詳細に説明する。 EXAMPLES Hereinafter, described in detail for the embodiment of the present invention with reference to the drawings. 図1は、本発明の一実施例を示す2ゾーンにおける基地局間フレーム同期タイムシーケンスである。 Figure 1 is a between base stations in the second zone the frame synchronization time sequence showing an embodiment of the present invention. n番目のフレームにおいて、基地局(BS In n-th frame, the base station (BS
1)で測定したフレーム位相の時間差t 1 (n)と、同時に基地局2で測定したt 2 (n)を、(n+1)番目のフレームで各々相手基地局に送信する。 A time difference t 1 (n) of the measured frame phase 1), at the same time t 2 as measured by the base station 2 (n), and transmits each to the other base station in the (n + 1) th frame.

【0013】各基地局では、t 1 (n)とt 2 (n)の比較を行う。 [0013] Each base station performs comparison of the t 1 (n) and t 2 (n). 例えば、本例では、t For example, in the present example, t 1 (n)>t 1 (n)> t
2 (n)の関係が成り立つので、基地局(BS2)のフレーム位相が基地局(BS1)より遅れていることを示しているため、基地局(BS1)は(n+2)番目のフレームでフレーム位相の修正をしない。 The relationship of 2 (n) holds, since the frame phase of the base station (BS2) indicating that lags the base station (BS1), the base station (BS1) is frame phase by (n + 2) th frame not a fix.

【0014】一方、基地局(BS2)でも同時にt [0014] On the other hand, the base station even (BS2) at the same time t
1 (n)とt 2 (n)の比較を行い、t 1 and performs a comparison of the t 2 (n) (n) , t 1 (n)>t 2 1 (n)> t 2
(n)の関係から(n+2)番目のフレームで遅延を補正し、基地局(BS2)のフレーム位相が基地局1のフレーム位相に同期するよう動作する。 The relationship (n) (n + 2) th corrected frame delay, frame phase of the base station (BS2) operates to synchronize the frame phase of the base station 1.

【0015】図2にフレーム位相の補正係数=0.2 [0015] Figure 2 of the frame phase correction factor = 0.2
(但し、補正係数とは送信フレームの補正を行う場合の重み付けを意味する)、基地局(BS1)と基地局(B (However, the correction coefficient is meant the weight of the case of correcting the transmission frame), the base station (BS1) and the base station (B
S2)の伝搬遅延時間差=1シンボルとした場合のフレーム位相の収束状態を示す。 Showing a convergence state of the frame phase of the case of the propagation delay time difference = 1 symbol S2). 本図より明かなように、各基地局はフレーム同期を確立し、かつ定常状態においても両局のフレーム位相は時間的にドリフトすることはない。 As apparent from this figure, each base station establishes frame synchronization, and frame phase of the two stations is not possible to temporally drift in the steady state.

【0016】 [0016]

【発明の効果】以上説明したように、本発明では各基地局間の距離が正確に推定できない場合でも、互いにフレーム同期を確立することが可能であり、かつ全体のフレーム位相が時間的にドリフトすることはない。 As described in the foregoing, in the present invention even when the distance between the base station can not accurately estimate, it is possible to establish frame synchronization with each other, and the entire frame phase temporally drift do not be.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の一実施例を示す図である。 1 is a diagram showing an embodiment of the present invention.

【図2】2ゾーン構成におけるフレーム位相の収束について示す図である。 2 is a diagram showing the convergence of frame phase in the two zones configuration.

【図3】TDMA方式を用いた移動通信システムの例を示す図である。 3 is a diagram showing an example of a mobile communication system using the TDMA scheme.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 無線ゾーンi 2 基地局i 3 無線ゾーンj 4 基地局j 5,6 携帯無線機 1 radio zone i 2 base station i 3 radio zone j 4 base station j 5, 6 portable radio

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 Nゾーンの基地局から構成されるTDM TDM composed 1. A N zone of the base station
    A(時分割多元接続)方式を用いた移動通信システムの、基地局間のTDMAフレーム同期を無線回線を用いて実現する方式において、 i番目(1≦i≦N)の基地局で、j番目(1≦j≦ A (Time Division Multiple Access) scheme mobile communication system using, in method realized by using the radio channel for TDMA frame synchronization between base stations, the i-th (1 ≦ i ≦ N) base stations, j th (1 ≦ j ≦
    N,j≠i)の基地局からの受信フレーム位相時間差Δ N, reception frame phase time difference from the base station of j ≠ i) delta
    ij =t j +T ij −t i (但し、t iはi番目の基地局のフレーム位相、t jはj番目の基地局からのフレーム位相、T ijはi番目の基地局とj番目の基地局との伝搬遅延時間)を測定し、 次にi番目の基地局はΔt ijを相手のj番目の基地局に送信し、各基地局ではフレーム位相の補正値ΔT i =m t ij = t j + T ij -t i ( where, t i is the i-th base station in frame phase, t j is the frame phase from the j th base station, T ij is the i-th base station and the j-th the propagation delay time between base station) measures, then the i-th base station transmits a Delta] t ij in the j-th base station of the other party, the correction value [Delta] T i = m in the frame phase in each base station
    ax(r i1 ,‥,r ii-1 ,r ii+1 ,‥,r iN )/2(但し、max(a,b,‥,z)は、a,b,‥,zの中で最大のものを選ぶ演算、また、r ij =Δt ji −Δ ax maximum (r i1, ‥, r ii -1, r ii + 1, ‥, r iN) / 2 ( where, max (a, b, ‥ , z) is, a, b, ‥, in z operation choose the one of the, also, r ij = Δt ji
    ij ,(i≠j))を計算し、 i番目の基地局は補正値ΔT iを用いてフレーム送信タイミングを補正することを特徴とする基地局間フレーム同期方式。 t ij, (i ≠ j) ) was calculated, i-th base station inter-base-station frame synchronous system and corrects the frame transmission timing using the correction value [Delta] T i.
JP23915392A 1992-09-08 1992-09-08 Inter-base station frame synchronizing system Pending JPH0690202A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23915392A JPH0690202A (en) 1992-09-08 1992-09-08 Inter-base station frame synchronizing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23915392A JPH0690202A (en) 1992-09-08 1992-09-08 Inter-base station frame synchronizing system

Publications (1)

Publication Number Publication Date
JPH0690202A true true JPH0690202A (en) 1994-03-29

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JP23915392A Pending JPH0690202A (en) 1992-09-08 1992-09-08 Inter-base station frame synchronizing system

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764648A (en) * 1994-07-20 1998-06-09 Sanyo Electric Co., Ltd. Method and apparatus for generating a transmission timing signal in a wireless telephone
EP0954122A1 (en) * 1998-04-28 1999-11-03 Siemens Aktiengesellschaft Method for the management of a radio communication system and such a system
US7715337B2 (en) 2004-02-06 2010-05-11 Sony Corporation Wireless communication system, wireless communication apparatus and wireless communication method, and computer program

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764648A (en) * 1994-07-20 1998-06-09 Sanyo Electric Co., Ltd. Method and apparatus for generating a transmission timing signal in a wireless telephone
EP0954122A1 (en) * 1998-04-28 1999-11-03 Siemens Aktiengesellschaft Method for the management of a radio communication system and such a system
US7715337B2 (en) 2004-02-06 2010-05-11 Sony Corporation Wireless communication system, wireless communication apparatus and wireless communication method, and computer program

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