JPH0690202A - Inter-base station frame synchronizing system - Google Patents
Inter-base station frame synchronizing systemInfo
- Publication number
- JPH0690202A JPH0690202A JP4239153A JP23915392A JPH0690202A JP H0690202 A JPH0690202 A JP H0690202A JP 4239153 A JP4239153 A JP 4239153A JP 23915392 A JP23915392 A JP 23915392A JP H0690202 A JPH0690202 A JP H0690202A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- frame
- frame phase
- phase
- time difference
- 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
Links
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【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
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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TDMA between base stations in a mobile communication system using a TDMA (time division multiple access) system.
The present invention relates to a method for realizing DMA frame synchronization by using a wireless line, and particularly to a configuration capable of preventing temporal drift of a 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。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。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、
５，６は携帯無線機を表わしている。2. Description of the Related Art An example of a mobile communication system using the TDMA system is shown in FIG. In the figure, a plurality of base stations are shown communicating with a portable radio device in each zone by the TDMA method. In the figure, 1 is a radio zone i, 2 is a base station i, 3 is a radio zone j, 4 is a base station j,
Reference numerals 5 and 6 represent portable wireless devices.
【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。自
局のフレーム位相をｔi 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ｔj 、その受信信号レベルを
Ｐj とする。これらの量を基に従来方式では補正すべき
位相量ΔＴi を“数１”のように算出する。Now, focusing on the i-th base station, a conventional frame synchronization establishment process will be described. The frame phase of the local station is t i , the frame phase received from the j-th base station is t j , and the received signal level is P j . Based on these amounts, the phase amount ΔT i to be corrected in the conventional method is calculated as in “Equation 1”.
【０００４】[0004]
【数１】 [Equation 1]
【０００５】ここで、Ｍは他局の数であり、ΔＴij＝ｔ
j −ｔi ＋２ｔO である。このΔＴi 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。この場
合、定数ｔO 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。Here, M is the number of other stations, and ΔT ij = t
is a j -t i + 2t O. Using this ΔT i , the i-th base station corrects its own transmission frame phase. In this case, it is necessary to accurately estimate the propagation time of the constant t O according to the propagation distance between the base stations, and if this value is not accurate, the frame phase of the base station will drift as a whole. I will end up.
【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 conventional inter-base station frame synchronization system, when the base stations establish frame synchronization in an autonomous distributed manner, when the distance between the base stations cannot be accurately estimated, As described above, there is a problem that the frame phases of all base stations drift with time.
【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。The present invention has been made in order to solve the above problems, and even if accurate distance estimation between base stations is not possible, the frame phase of all base stations does not drift with time. It is intended 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。According to the invention, the above object is achieved by means of the patent 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
≦ｉ≦Ｎ）の基地局で、ｊ番目（１≦ｊ≦Ｎ，ｊ≠ｉ）
の基地局からの受信フレーム位相時間差Δｔij＝ｔj＋
Ｔij−ｔi （但し、ｔi はｉ番目の基地局のフレーム位
相、ｔj はｊ番目の基地局からのフレーム位相、Ｔij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Δｔij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
Ｔi ＝ｍａｘ（ｒi1，‥，ｒii-1，ｒii +1，‥，ｒiN）
／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、ｒij＝Δｔ
ji−Δｔij，（ｉ≠ｊ））を計算し、ｉ番目の基地局は
補正値ΔＴi 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。That is, the present invention is a system for realizing TDMA frame synchronization between base stations of a mobile communication system using a TDMA (time division multiple access) system composed of N-zone base stations by using a wireless line. In the i-th (1
≦ i ≦ N) base station, j-th (1 ≦ j ≦ N, j ≠ i)
Frame phase time difference Δt ij = t j + from the base station of
T ij −t i (where, t i is the frame phase of the i-th base station, t j is the frame phase from the j-th base station, and T ij is the propagation between the i-th base station and the j-th base station. Delay time), the i-th base station then transmits Δt ij to the partner j-th base station, and each base station corrects the frame phase correction value Δ.
T i = max (r i1 , ..., r ii-1 , r ii +1 , ..., r iN )
/ 2 (however, max (a, b, ..., Z) is a, b,
.., an operation for selecting the largest one among z, and r ij = Δt
ji- Δt ij , (i ≠ j)) is calculated, and the i-th base station is a frame synchronization method between base stations configured to correct the frame transmission timing using the correction value ΔT 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。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。In the present invention, the time difference between the frame phase of the own station and the frame phase of the received frame from the partner base station is measured at each base station, and the frame transmission timing is corrected so that the time difference becomes the same. Then, when the time differences become the same, the frame phases of both base stations are synchronized.
【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。Therefore, in the inter-base station frame synchronization method of the present invention, it is not necessary to accurately estimate the distance between the base stations, the frame phases of all base stations are synchronized with each other, and the drift of the overall frame phase is Does not happen.
【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。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。ｎ番目のフレームにおいて、基地局（ＢＳ
１）で測定したフレーム位相の時間差ｔ1 （ｎ）と、同
時に基地局２で測定したｔ2 （ｎ）を、（ｎ＋１）番目
のフレームで各々相手基地局に送信する。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a frame synchronization time sequence between base stations in two zones showing an embodiment of the present invention. In the nth frame, the base station (BS
The frame phase time difference t 1 (n) measured in 1) and t 2 (n) measured by the base station 2 at the same time are transmitted to the partner base station in the (n + 1) th frame.
【００１３】各基地局では、ｔ1 （ｎ）とｔ2 （ｎ）の
比較を行う。例えば、本例では、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。At each base station, t1(N) and t2(N)
Make a comparison. For example, in this example, t 1(N)> t
2Since the relationship of (n) is established, the base station (BS2)
Indicates that the Lame phase is behind the base station (BS1)
Therefore, the base station (BS1) has the (n + 2) th frame.
Do not correct the frame phase in the frame.
【００１４】一方、基地局（ＢＳ２）でも同時にｔ
1 （ｎ）とｔ2 （ｎ）の比較を行い、ｔ 1 （ｎ）＞ｔ2
（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。On the other hand, at the base station (BS2), t
1(N) and t2(N) is compared and t 1(N)> t2
From the relationship of (n), the delay is compensated at the (n + 2) th frame.
The frame phase of the base station (BS2) is correct.
It operates to synchronize with the Laem phase.
【００１５】図２にフレーム位相の補正係数＝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
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。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。FIG. 2 shows the correction coefficient of the frame phase = 0.2.
(However, the correction coefficient means weighting when correcting the transmission frame), the base station (BS1) and the base station (B
The convergence state of the frame phase when the propagation delay time difference of S2) = 1 symbol is shown. As is clear from this figure, each base station establishes frame synchronization, and even in the steady state, the frame phases of both stations do not drift with time.
【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 above, according to the present invention, it is possible to establish frame synchronization with each other even when the distance between base stations cannot be accurately estimated, and the entire frame phase drifts with time. There is nothing to do.
【図１】本発明の一実施例を示す図である。FIG. 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。FIG. 2 is a diagram showing convergence of frame phases in a two-zone 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。FIG. 3 is a diagram showing an example of a mobile communication system using the TDMA method.
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 wireless zone i 2 base station i 3 wireless zone j 4 base station j 5,6 portable wireless device
Claims (1)
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≦
Ｎ，ｊ≠ｉ）の基地局からの受信フレーム位相時間差Δ
ｔij＝ｔj ＋Ｔij−ｔi （但し、ｔi はｉ番目の基地局
のフレーム位相、ｔj はｊ番目の基地局からのフレーム
位相、Ｔij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Δｔij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ΔＴi ＝ｍ
ａｘ（ｒi1，‥，ｒii-1，ｒii+1，‥，ｒiN）／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、ｒij＝Δｔji−Δ
ｔij，（ｉ≠ｊ））を計算し、 ｉ番目の基地局は補正値ΔＴi 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。1. A TDM comprising base stations in N zones.
In a method of realizing TDMA frame synchronization between base stations using a wireless line in a mobile communication system using A (time division multiple access) method, an i-th (1 ≦ i ≦ N) base station and a j-th base station (1 ≦ j ≦
N, j ≠ i) received frame phase time difference Δ from the base station
t ij = t j + T ij −t i (where t i is the frame phase of the i-th base station, t j is the frame phase from the j-th base station, and T ij is the i-th base station and the j-th base station). Propagation delay time with the base station), the i-th base station transmits Δt ij to the other j-th base station, and each base station corrects the frame phase correction value ΔT i = m
ax (r i1 , ..., r ii-1 , r ii + 1 , ..., r iN ) / 2 (however, max (a, b, ..., z) is the maximum among a, b ,. , R ij = Δt ji −Δ
t ij , (i ≠ j)) is calculated, and the i-th base station corrects the frame transmission timing using the correction value ΔT i .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4239153A 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 |
|---|---|---|---|
| JP4239153A JPH0690202A (en) | 1992-09-08 | 1992-09-08 | Inter-base station frame synchronizing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0690202A true JPH0690202A (en) | 1994-03-29 |
Family
ID=17040543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4239153A Pending JPH0690202A (en) | 1992-09-08 | 1992-09-08 | Inter-base station frame synchronizing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0690202A (en) |
Cited By (3)
| 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 |
-
1992
- 1992-09-08 JP JP4239153A patent/JPH0690202A/en active Pending
Cited By (3)
| 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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