JPH0865201A - Mobile communication equipment - Google Patents
Mobile communication equipmentInfo
- Publication number
- JPH0865201A JPH0865201A JP6193458A JP19345894A JPH0865201A JP H0865201 A JPH0865201 A JP H0865201A JP 6193458 A JP6193458 A JP 6193458A JP 19345894 A JP19345894 A JP 19345894A JP H0865201 A JPH0865201 A JP H0865201A
- Authority
- JP
- Japan
- Prior art keywords
- sho
- circuit
- base station
- reception
- reception quality
- 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
- 238000010295 mobile communication Methods 0.000 title claims description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 230000003111 delayed effect Effects 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 10
- 230000002194 synthesizing effect Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 22
- 238000004891 communication Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＣＤＭＡ（Code Divis
ion Multiple Access ）方式の移動通信装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a CDMA (Code Divis)
ion multiple access) mobile communication device.
【０００２】[0002]
【従来の技術】図５は従来のＣＤＭＡ方式移動通信装置
における移動局の概略構成を示す。図５において、５１
は送信データ変換回路、５２は１次変調回路、５３は拡
散回路、５４は２次変調回路、５５は送信アンテナ、５
６ａ，５６ｂは受信アンテナ、５７ａ，５７ｂは１次復
調回路、５８ａ，５８ｂは逆拡散回路、５９ａ，５９ｂ
は２次復調回路、６０ａ，６０ｂは受信データ変換回
路、６１は選択回路、６２はタイミング制御回路であ
る。2. Description of the Related Art FIG. 5 shows a schematic configuration of a mobile station in a conventional CDMA mobile communication device. In FIG. 5, 51
Is a transmission data conversion circuit, 52 is a primary modulation circuit, 53 is a spreading circuit, 54 is a secondary modulation circuit, 55 is a transmission antenna, 5
6a and 56b are receiving antennas, 57a and 57b are primary demodulation circuits, 58a and 58b are despreading circuits, and 59a and 59b.
Is a secondary demodulation circuit, 60a and 60b are received data conversion circuits, 61 is a selection circuit, and 62 is a timing control circuit.
【０００３】次に上記従来例の動作について説明する。
送信側では、音声またはデータ端末からの伝送されるべ
き情報が送信データ変換回路５１に入力され、制御信号
等を付加してフレームが構成され、１次変調回路５２に
おいて各種変調方式により変調され、拡散回路５３で符
号拡散した後、２次変調回路５４において所望のキャリ
ア周波数に変換され、送信アンテナ５５から送信され
る。また受信側では、アンテナ５６ａ，５６ｂのうち、
受信側では、通常時は１系統のみを用い、受信アンテナ
５６ａで受信された信号は、１次復調回路５７ａでベー
スバンド信号に変換され、逆拡散回路５８ａで相関検出
を行ない、さらに２次復調回路５９ａでベースバンドデ
ータが復調され、受信データ変換回路６０ａで制御信号
と音声またはデータに分離され、選択回路６１は、この
場合１系統なので、受信データ変換回路６０ａの出力を
そのまま出力し、音声またはデータ端末において所望の
情報を得る。タイミング制御回路６２は、移動局の全タ
イミングおよびシーケンスの制御を行なう。また、遅延
波を分離できず受信品質が劣化した場合は、アンテナ５
６ａ，５６ｂの２系統使用し、受信レベル、誤り検出情
報を用いて、品質の良い受信データを選択するスペース
ダイバーシチを行ない、受信品質を向上させることがで
きる。さらに、現接続基地局との受信品質が劣化した場
合のソフトハンドオーバ（ＳＨＯ）時には、２つの基地
局に対し、２系統の受信機を用いてデータ再生を行な
い、選択回路６１で受信レベルおよび誤り検出情報を用
いてデータを選択する。Next, the operation of the above conventional example will be described.
On the transmission side, information to be transmitted from a voice or data terminal is input to a transmission data conversion circuit 51, a control signal or the like is added to form a frame, and a primary modulation circuit 52 modulates the frame by various modulation methods. After the code is spread by the spreading circuit 53, it is converted to a desired carrier frequency by the secondary modulation circuit 54 and transmitted from the transmitting antenna 55. On the receiving side, of the antennas 56a and 56b,
On the receiving side, normally only one system is used, and the signal received by the receiving antenna 56a is converted into a baseband signal by the primary demodulation circuit 57a, the correlation detection is performed by the despreading circuit 58a, and the secondary demodulation is further performed. The circuit 59a demodulates the baseband data, and the reception data conversion circuit 60a separates it into a control signal and voice or data. Since the selection circuit 61 has one system in this case, the output of the reception data conversion circuit 60a is output as it is, Alternatively, the desired information is obtained at the data terminal. The timing control circuit 62 controls all timings and sequences of the mobile station. If the delayed wave cannot be separated and the reception quality deteriorates, the antenna 5
It is possible to improve the reception quality by using two systems of 6a and 56b, performing space diversity for selecting reception data of good quality by using the reception level and error detection information. Further, at the time of soft handover (SHO) when the reception quality with the currently connected base station is deteriorated, data reproduction is performed for the two base stations by using the receivers of two systems, and the selection circuit 61 receives the reception level and error. Select data using detection information.
【０００４】[0004]
【発明が解決しようとする課題】ＣＤＭＡ方式の特徴と
して、拡散チップ幅より遅延分散が大きいと、逆拡散を
行なうことで複数の遅延波に分離でき、これらを合成す
ることにより、パスダイバーシチ効果を得られる。しか
しながら、上記従来の移動通信装置では、マイクロセル
や伝送レートが低い場合等には遅延波を分離することが
できず、パスダイバーシチ効果が得られず、受信品質が
劣化することになる。このような場合、スペースダイバ
ーシチを行なうことも可能であるが、アンテナおよび１
次復調回路を追加する必要があり、ハードウェアの規模
が大きくなるという問題があった。A feature of the CDMA system is that if the delay dispersion is larger than the spreading chip width, it can be separated into a plurality of delayed waves by performing despreading, and by combining these, the path diversity effect can be obtained. can get. However, in the above conventional mobile communication device, when the microcell or the transmission rate is low, the delayed waves cannot be separated, the path diversity effect cannot be obtained, and the reception quality deteriorates. In such a case, it is possible to perform space diversity, but the antenna and 1
It is necessary to add a secondary demodulation circuit, which causes a problem of increasing the scale of hardware.
【０００５】本発明は、このような従来の問題を解決す
るものであり、パスダイバーシチ効果が得られない条件
下においても、ハードウェアの増加を伴うことなく受信
品質を保つことのできる優れた移動通信装置を提供する
ことを目的とするものである。The present invention solves such a conventional problem, and even under the condition that the path diversity effect is not obtained, it is possible to maintain excellent reception quality without increasing the hardware. It is intended to provide a communication device.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記目的を達
成するために、基地局において、パスダイバーシチ効果
が得られない条件下では同一情報を同一キャリアおよび
異なる拡散コードで送信パワを１／２にして２系統の送
信を行ない、移動局では１系統のアンテナで受信し、受
信した受信信号を１次復調回路でベースバンド信号に変
換し、２系統の逆拡散回路で相関検出を行ない、２系統
の受信信号に対してそれぞれデータ再生を行なって選択
回路において受信レベルおよび誤り検出情報を用いて選
択することにより、受信品質を向上させるようにしたも
のである。また、ＳＨＯ時には、ＳＨＯ元基地局とＳＨ
Ｏ先基地局とでそれぞれ１系統にし、サイトダイバーシ
チで受信品質を保ち、ＳＨＯ終了後、ＳＨＯ先基地局と
再び２系統で通信を行ない、受信品質を保つようにした
ものである。In order to achieve the above object, the present invention reduces the transmission power of the same information by the same carrier and different spreading codes in a base station under the condition that the path diversity effect is not obtained. Then, the mobile station receives the signal with the 1-system antenna, converts the received signal into a baseband signal with the primary demodulation circuit, and performs the correlation detection with the 2-system despreading circuit. This is to improve the reception quality by performing data reproduction on the reception signals of the two systems and selecting them using the reception level and the error detection information in the selection circuit. At the time of SHO, the SHO source base station and SH
One system is used for each of the O-destination base station, the reception quality is maintained by site diversity, and after the SHO ends, the two systems are communicated with the SHO-destination base station again to maintain the reception quality.
【０００７】[0007]
【作用】したがって本発明によれば、パスダイバーシチ
効果が得られない条件下では基地局送信を２系統とし、
移動通信装置において、拡散コードに応じて独立に相関
検出、データ再生を行ない、受信レベル、誤り検出情報
を用いて受信品質の良い方を選択するか、両方を重み付
け合成することで受信品質を向上させることができる。
また、ＳＨＯ時には、ＳＨＯ元基地局とＳＨＯ先基地局
とで送信をそれぞれ１系統とし、サイトダイバーシチで
受信品質を保ち、ＳＨＯ終了後、ＳＨＯ先基地局と再び
２系統で通信を行ない、受信品質を保つことにより、ハ
ードウェアの増加を伴うことなく受信品質を保つことが
できる。Therefore, according to the present invention, under the condition that the path diversity effect is not obtained, the base station transmission is set to two systems,
In mobile communication devices, correlation detection and data reproduction are performed independently according to the spreading code, and the better reception quality is selected using the reception level and error detection information, or both are weighted and combined to improve reception quality. Can be made.
Also, during SHO, the SHO source base station and the SHO destination base station use one system for transmission respectively, maintain the reception quality with site diversity, and after the SHO, recommunicate with the SHO destination base station by two systems and receive quality again. By maintaining, the reception quality can be maintained without increasing the hardware.
【０００８】[0008]
（実施例１）図１は本発明の第１の実施例の概略構成を
示すものである。図１において、１は送信データ変換回
路、２は１次変調回路、３は拡散回路、４は２次変調回
路、５は送信アンテナ、６は受信アンテナ、７は１次復
調回路、８ａ，８ｂは逆拡散回路、９ａ，９ｂは２次復
調回路、１０ａ，１０ｂは受信データ変換回路、１１は
選択回路、１２は受信品質判定回路、１３はタイミング
制御回路である。(Embodiment 1) FIG. 1 shows a schematic configuration of a first embodiment of the present invention. In FIG. 1, 1 is a transmission data conversion circuit, 2 is a primary modulation circuit, 3 is a diffusion circuit, 4 is a secondary modulation circuit, 5 is a transmission antenna, 6 is a reception antenna, 7 is a primary demodulation circuit, and 8a and 8b. Is a despreading circuit, 9a and 9b are secondary demodulation circuits, 10a and 10b are received data conversion circuits, 11 is a selection circuit, 12 is a reception quality judgment circuit, and 13 is a timing control circuit.
【０００９】次に本実施例の動作について説明する。送
信側では、音声またはデータ端末からの伝送されるべき
情報が送信データ変換回路１に入力され、制御信号等を
付加してフレームを構成し、１次変調回路２において各
種変調方式により変調され、拡散回路３で符号拡散した
後、２次変調回路４において所望のキャリア周波数に変
換され、送信アンテナ５から送信される。また受信側で
は、受信アンテナ６で受信された信号は、１次復調回路
７でベースバンド信号に変換され、２系統のうち一方の
逆拡散回路８ａで拡散コードに応じて相関検出を行な
い、さらに２次復調回路９ａでベースバンドデータが復
調され、受信データ変換回路１０ａで制御信号と音声ま
たはデータに分離される。選択回路１１では、復調デー
タは１系統であるため、受信データ変換回路１０ａから
の復調データをそのまま出力し、音声またはデータ端末
において所望の情報を得る。Next, the operation of this embodiment will be described. On the transmission side, information to be transmitted from a voice or data terminal is input to the transmission data conversion circuit 1, a control signal or the like is added to form a frame, and the frame is modulated by the primary modulation circuit 2 by various modulation methods. After the code is spread by the spreading circuit 3, it is converted to a desired carrier frequency by the secondary modulation circuit 4 and transmitted from the transmitting antenna 5. On the receiving side, the signal received by the receiving antenna 6 is converted into a baseband signal by the primary demodulation circuit 7 and the despreading circuit 8a of one of the two systems performs correlation detection according to the spreading code. The secondary demodulation circuit 9a demodulates the baseband data, and the reception data conversion circuit 10a separates it into a control signal and voice or data. In the selection circuit 11, since the demodulated data is one system, the demodulated data from the reception data conversion circuit 10a is output as it is, and desired information is obtained in a voice or data terminal.
【００１０】２次復調回路９ａでは、設定されたしきい
値を超えた遅延波の数をカウントし、受信データ変換回
路１０ａでは誤り検出を行なう。この遅延波の数および
誤り検出情報から受信品質判定回路１２において受信品
質を比較を行ない、受信品質が劣化したと判断した場合
は、基地局に対して送信を２系統にすることを制御信号
を通じて報告する。方向を受けた基地局は、同一情報を
同一キャリアおよび異なる拡散コードで送信パワを１／
２にして２系統の送信を行ない、移動局では、受信アン
テナ６で受信された信号が１次復調回路７でベースバン
ド信号に変換され、２系統の逆拡散回路８ａ，８ｂでそ
れぞれの拡散コードに応じて相関検出を行ない、さらに
２系統の２次復調回路９ａ，９ｂでベースバンドデータ
がそれぞれ復調され、受信データ変換回路１０ａ，１０
ｂで制御信号と音声またはデータに分離される。受信デ
ータ変換回路１０ａ，１０ｂからの２系統の復調データ
は、選択回路１１において、受信レベルおよび誤り検出
情報を用いて受信品質の良い受信データを選択し、音声
またはデータ端末において所望の情報を得る。タイミン
グ制御回路１３は、移動局の全タイミングおよびシーケ
ンスの制御を行なう。受信レベルおよび誤り検出情報の
検出機能は、この種の移動局に通常備わっているもので
あり、ハードウェアの増加はない。The secondary demodulation circuit 9a counts the number of delayed waves exceeding the set threshold value, and the reception data conversion circuit 10a performs error detection. The reception quality judgment circuit 12 compares the reception qualities from the number of delayed waves and the error detection information, and when the reception qualities are judged to be deteriorated, the control signal tells the base station to set the transmission to two systems. To report. Upon receiving the direction, the base station transmits the same information with the same carrier and different spreading codes at 1 / power.
In the mobile station, the signal received by the receiving antenna 6 is converted into a baseband signal by the primary demodulation circuit 7, and the spreading codes of the two systems are despreading circuits 8a and 8b. Correlation detection is performed in accordance with the received data conversion circuits 10a and 10b.
In b, it is separated into a control signal and voice or data. In the demodulation data of two systems from the reception data conversion circuits 10a and 10b, the selection circuit 11 selects reception data with good reception quality using the reception level and error detection information, and obtains desired information in a voice or data terminal. . The timing control circuit 13 controls all timings and sequences of the mobile station. The function of detecting the reception level and the error detection information is usually provided in this type of mobile station, and there is no increase in hardware.
【００１１】（実施例２）図２は本発明の第２の実施例
の概略構成を示すものであり、上記第１の実施例と異な
るのは、ＳＨＯを行なうために４系統の受信回路とそれ
を選択するための回路を備えていることである。すなわ
ち、それぞれ同一構成の２系統の２つの受信回路２１、
２２と、各受信回路２１、２２における２系統のうちの
１系統をそれぞれ選択するための２つの選択回路２３、
２４と、各選択回路２３、２４のいずれか一方を選択す
るための基地局選択回路２５とを備え、他の構成は、受
信品質判定回路２６およびタイミング制御回路２７を含
めて、第１の実施例と同じである。(Embodiment 2) FIG. 2 shows a schematic configuration of a second embodiment of the present invention. The difference from the first embodiment is that it has four receiving circuits for performing SHO. It is equipped with a circuit for selecting it. That is, two receiving circuits 21 of two systems each having the same configuration,
22 and two selection circuits 23 for selecting one of the two systems in each of the receiving circuits 21 and 22,
24, and a base station selection circuit 25 for selecting one of the selection circuits 23, 24. Other configurations include the reception quality determination circuit 26 and the timing control circuit 27. Same as the example.
【００１２】次に本実施例の動作について説明する。通
常時および受信品質が良好の場合は実施例１の動作と同
一である。移動局が受信回路２１で２系統の受信を行な
っているときも、２次復調回路９ａ，９ｂでは、設定さ
れたしきい値を超えた遅延波の数をカウントし、受信デ
ータ変換回路１０ａ，１０ｂでは誤り検出を行なう。こ
の２系統の遅延波の数および誤り検出情報から受信品質
判定回路２６においてそれぞれの受信品質が劣化したと
判断した場合は、ソフトハンドオーバを行なうために、
さらにＳＨＯ先基地局の送信信号に対して受信回路２２
の２系統の逆拡散回路８ｃ，８ｄでそれぞれの拡散コー
ドに応じて相関検出を行ない、さらに２次復調回路９
ｃ，９ｄでベースバンドデータがそれぞれ復調され、受
信データ変換回路１０ｃ，１０ｄで制御信号と音声また
はデータに分離される。受信データ変換回路１０ｃ，１
０ｄからの２系統の復調データは、選択回路２４におい
て、受信レベルおよび誤り検出情報を用いて受信品質の
良い方を選択する。さらに、基地局選択回路２５では、
ＳＨＯ元基地局とＳＨＯ先基地局の選択された信号をそ
れぞれの受信レベルおよび誤り検出情報を比較していず
れか一方を選択することにより、サイトダイバーシチの
効果が得られ、音声またはデータ端末において所望の情
報を得る。タイミング制御回路２７は、移動局の全タイ
ミングおよびシーケンスの制御を行なう。受信レベルお
よび誤り検出情報の検出機能は、この種の移動局に通常
備わっているものであり、ハードウェアの増加はない。Next, the operation of this embodiment will be described. The operation is the same as that of the first embodiment in the normal state and when the reception quality is good. Even when the mobile station is performing two-system reception by the reception circuit 21, the secondary demodulation circuits 9a and 9b count the number of delayed waves that exceed the set threshold value, and the reception data conversion circuit 10a and In 10b, error detection is performed. When the reception quality judgment circuit 26 judges that the respective reception qualities have deteriorated from the number of delayed waves of the two systems and the error detection information, in order to perform the soft handover,
Further, the reception circuit 22 receives the transmission signal from the SHO destination base station.
The two despreading circuits 8c and 8d perform correlation detection according to the respective spreading codes, and the secondary demodulation circuit 9
Baseband data are demodulated by c and 9d, respectively, and separated by the reception data conversion circuits 10c and 10d into a control signal and voice or data. Received data conversion circuit 10c, 1
The demodulation data of two systems from 0d is selected by the selection circuit 24 using the reception level and the error detection information, whichever has the better reception quality. Furthermore, in the base station selection circuit 25,
By comparing one of the signals selected by the SHO-source base station and the SHO-destination base station with their respective reception levels and error detection information, and selecting either one, the site diversity effect can be obtained, which is desirable in a voice or data terminal. Get information on. The timing control circuit 27 controls all timings and sequences of the mobile station. The function of detecting the reception level and the error detection information is usually provided in this type of mobile station, and there is no increase in hardware.
【００１３】（実施例３）図３は本発明の第３の実施例
の概略構成を示すものであり、第１の実施例と異なるの
は、選択回路１１に代えて合成回路３１を設けた点だけ
であり、他の構成は第１の実施例と同じである。本実施
例の動作は、通常時および受信品質が良好の場合と２系
統の受信を行なう場合の受信データ変換回路１０ａ，１
０ｂまでは実施例１の動作と同一である。受信データ変
換回路１０ａ，１０ｂの出力は、合成回路３１に入力さ
れ、受信レベル等により重み付けされた合成を行ない、
音声またはデータ端末において所望の情報を得る。(Embodiment 3) FIG. 3 shows a schematic configuration of a third embodiment of the present invention. The difference from the first embodiment is that a synthesis circuit 31 is provided instead of the selection circuit 11. Only the points are different, and the other configuration is the same as that of the first embodiment. The operation of the present embodiment is performed in the reception data conversion circuits 10a and 10a in the normal state, the case where the reception quality is good, and the case where the reception of two systems is performed.
The operation up to 0b is the same as that of the first embodiment. The outputs of the reception data conversion circuits 10a and 10b are input to the synthesizing circuit 31 to perform synthesizing weighted by the reception level and the like,
Get the desired information at the voice or data terminal.
【００１４】このように、本実施例によれば、２系統の
受信データを重み付け合成することで、受信品質を向上
させることができる。なお、合成回路３１は図２の選択
回路２３、２４に代えて設けることができる。As described above, according to this embodiment, the reception quality can be improved by weighting and combining the reception data of the two systems. The synthesis circuit 31 can be provided in place of the selection circuits 23 and 24 shown in FIG.
【００１５】（実施例４）図４は本発明の第４の実施例
におけるＳＨＯ通信を行なうための方法を示しており、
移動局の構成は、図１または図３と同一であり、また通
常時および受信品質が良好の場合の動作は、実施例１お
よび３と同一である。(Embodiment 4) FIG. 4 shows a method for performing SHO communication in a fourth embodiment of the present invention.
The configuration of the mobile station is the same as that of FIG. 1 or FIG. 3, and the operation in normal time and when the reception quality is good is the same as that of the first and third embodiments.
【００１６】図４（ａ）において、通常、移動局ＰＳ
は、まず１系統の受信回路で基地局ＢＳ１と通信を行な
う。遅延波の数および誤り検出情報から受信品質判定回
路１２において受信品質を比較し、受信品質が劣化した
と判断した場合は、基地局ＢＳ１に対して送信を２系統
にすることを制御信号を通じて報告する。報告を受けた
基地局ＢＳ１は、同一情報を同一キャリアおよび異なる
拡散コードで送信パワを１／２にして２系統の送信を行
ない、移動局ＰＳでは、図４（ｂ）のように２系統の受
信を行なう。２系統の受信を行なっているときも、２系
統の２次復調回路９ａ，９ｂでは、設定されたしきい値
を超えた遅延波の数をカウントし、２系統の受信データ
変換回路１０ａ，１０ｂでは誤り検出を行なう。この２
系統の遅延波の数および誤り検出情報から受信品質判定
回路１２においてそれぞれの受信品質が劣化したと判断
した場合は、ソフトハンドオーバを行なう。ソフトハン
ドオーバの状態に移行する際、移動局ＰＳは、周辺基地
局からの送信信号の移動局ＰＳでの受信レベルを測定
し、受信レベルのもっとも高い基地局（例えば図４
（ｂ）のＢＳ２とする）に対してソフトハンドオーバの
要求を制御信号でＳＨＯ先基地局ＢＳ２に報告する。基
地局ＢＳ２で要求が受理されると、図４（ｃ）のように
タイミング制御回路１３は、現在通信中のＳＨＯ元基地
局ＢＳ１の受信を１系統とし、ＢＳ２とはもう一方の受
信回路で受信する。移動局ＰＳは、ＢＳ１の受信レベル
および誤り検出情報から受信品質判定回路１２において
ＢＳ１からの受信品質が劣化したと判断した場合、ＢＳ
１に対しては通信停止を報告し、ＢＳ２に対しては送信
を２系統にすることを制御信号を通じて報告する。報告
を受けたＢＳ２は、同一情報を同一キャリアおよび異な
る拡散コードで送信パワを１／２にして２系統の送信を
行ない、図４（ｄ）にようにＢＳ２において２系統の受
信を行なう。In FIG. 4A, the mobile station PS is normally used.
First communicates with the base station BS1 using a single-system receiving circuit. The reception quality judgment circuit 12 compares the reception qualities from the number of delay waves and the error detection information, and when it judges that the reception qualities have deteriorated, it reports to the base station BS1 through the control signal that the transmission is to be in two systems. To do. Receiving the report, the base station BS1 transmits the same information by using the same carrier and different spreading codes with the transmission power reduced to ½, and the mobile station PS transmits the two systems as shown in FIG. 4 (b). Receive. Even when receiving two systems, the two-system secondary demodulation circuits 9a and 9b count the number of delayed waves exceeding the set threshold value, and the two-system reception data conversion circuits 10a and 10b. Then, error detection is performed. This 2
When the reception quality determination circuit 12 determines that the reception quality has deteriorated from the number of delay waves of the system and the error detection information, soft handover is performed. When shifting to the soft handover state, the mobile station PS measures the reception level of the transmission signal from the peripheral base station at the mobile station PS, and the base station with the highest reception level (for example, FIG. 4).
A request for soft handover is sent to (SHO) base station BS2 by a control signal. When the request is accepted by the base station BS2, the timing control circuit 13 sets the reception of the SHO source base station BS1 currently in communication as one system and the other receiving circuit is different from BS2 as shown in FIG. 4 (c). To receive. When the mobile station PS determines that the reception quality from the BS1 has deteriorated in the reception quality judgment circuit 12 based on the reception level of BS1 and the error detection information, the BS receives BS.
The communication stop is reported to 1 and the transmission to the BS 2 is reported to the BS 2 through the control signal. Receiving the report, BS2 transmits the same information by using the same carrier and different spreading codes with the transmission power reduced to ½, and the two systems perform the two-system reception as shown in FIG. 4 (d).
【００１７】このように、本実施例によれば、２系統の
受信回路でもＳＨＯを行なうことができる。As described above, according to this embodiment, SHO can be performed even in the two-system receiving circuit.
【００１８】[0018]
【発明の効果】本発明は、上記実施例から明らかなよう
に、パスダイバーシチが得られない条件下においても、
基地局送信を２系統とすることで、移動通信装置の受信
品質を向上させる効果を有する。また、ハードウェア規
模を増加させることなく受信品質を向上させる効果を有
する。As is apparent from the above-mentioned embodiment, the present invention is effective even under the condition that the path diversity is not obtained.
The use of two base station transmissions has the effect of improving the reception quality of the mobile communication device. Further, it has an effect of improving the reception quality without increasing the hardware scale.
【図１】本発明の第１の実施例における移動局の概略構
成を示すブロック図FIG. 1 is a block diagram showing a schematic configuration of a mobile station according to a first embodiment of the present invention.
【図２】本発明の第２の実施例における移動局の概略構
成を示すブロック図FIG. 2 is a block diagram showing a schematic configuration of a mobile station according to a second embodiment of the present invention.
【図３】本発明の第３の実施例における移動局の概略構
成を示すブロック図FIG. 3 is a block diagram showing a schematic configuration of a mobile station according to a third embodiment of the present invention.
【図４】本発明の第４の実施例におけるＳＨＯ通信を行
なうための方法を示す模式図FIG. 4 is a schematic diagram showing a method for performing SHO communication in a fourth embodiment of the present invention.
【図５】従来例における移動局の概略構成を示すブロッ
ク図FIG. 5 is a block diagram showing a schematic configuration of a mobile station in a conventional example.
１ 送信データ変換回路 ２ １次変調回路 ３ 拡散回路 ４ ２次変調回路 ５ 送信アンテナ ６ 受信アンテナ ７ １次復調回路 ８ａ，８ｂ 逆拡散回路 ９ａ，９ｂ ２次復調回路 １０ａ，１０ｂ 受信データ変換回路 １１ 選択回路 １２ 受信品質選択回路 ２１，２２ 受信回路 ２３，２４ 選択回路 ２５ 基地局選択回路 ２６ 受信品質判定回路 ２７ タイミング制御回路 ３１ 合成回路 ＢＳ１，ＢＳ２ 基地局 ＰＳ 移動局 1 transmission data conversion circuit 2 primary modulation circuit 3 spreading circuit 4 secondary modulation circuit 5 transmission antenna 6 reception antenna 7 primary demodulation circuit 8a, 8b despreading circuit 9a, 9b secondary demodulation circuit 10a, 10b reception data conversion circuit 11 Selection circuit 12 Reception quality selection circuit 21,22 Reception circuit 23,24 Selection circuit 25 Base station selection circuit 26 Reception quality judgment circuit 27 Timing control circuit 31 Combining circuit BS1, BS2 Base station PS Mobile station
Claims (4)
ess ）方式移動通信装置において、遅延波を分解できず
パスダイバーシチ効果が得られない条件下において、基
地局は移動局に対して同一情報を同一キャリアおよび異
なる拡散コードで送信パワを１／２にして送信を行な
い、移動局は、前記送信信号を１系統のアンテナで受信
し、前記アンテナで受信した受信信号を１次復調回路で
ベースバンド信号に変換し、２系統の逆拡散回路で相関
検出を行ない、前記相関検出を行なった２系統の受信信
号に対してそれぞれデータ再生を行なう２次復調回路を
２系統持ち、前記２系統の再生データのいずれか一方を
選択回路において受信レベルおよび誤り検出情報を用い
て選択することを特徴とする移動通信装置。1. A CDMA (Code Division Multiple Acc)
In the ess) type mobile communication device, under the condition that the delayed wave cannot be decomposed and the path diversity effect cannot be obtained, the base station halves the transmission power of the same information to the mobile station using the same carrier and different spreading codes. The mobile station receives the transmission signal with a single-system antenna, converts the received signal received by the antenna into a baseband signal with a primary demodulation circuit, and detects correlation with a double-system despreading circuit. And has two secondary demodulation circuits for respectively performing data reproduction on the received signals of the two systems for which the correlation detection is performed, and one of the reproduced data of the two systems is received in the selection circuit and error detection is performed. A mobile communication device characterized by making a selection using information.
ために、移動局の受信回路を４系統備え、ＳＨＯ元基地
局とＳＨＯ先基地局の送信信号を２系統受信可能な請求
項１記載の移動通信装置。2. The mobile communication according to claim 1, further comprising four receiving circuits of a mobile station for soft handover (SHO) and capable of receiving two transmission signals of the SHO source base station and the SHO destination base station. apparatus.
を受信レベルにより重み付け合成を行なう合成回路を備
えた請求項１または２記載の移動通信装置。3. The mobile communication device according to claim 1, further comprising a synthesizing circuit for weighting and synthesizing the reception data, which has been subjected to correlation detection of two systems, according to a reception level.
はＳＨＯ元基地局の送信信号を受信する移動局の受信回
路を１系統とし、もう一方の受信回路でＳＨＯ先基地局
の送信信号を受信することによりＳＨＯを行ない、ＳＨ
Ｏ終了時には、ＳＨＯ先基地局の送信信号を２系統受信
することを特徴とする請求項１または３記載の移動通信
装置。4. When the receiving circuit performs SHO with two systems, the receiving circuit of the mobile station that receives the transmission signal of the SHO source base station is one system, and the receiving circuit of the other receiving circuit is the transmission signal of the SHO destination base station. SHO is performed by receiving the
The mobile communication device according to claim 1 or 3, characterized in that, when O is completed, two transmission signals of the SHO destination base station are received.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6193458A JPH0865201A (en) | 1994-08-18 | 1994-08-18 | Mobile communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6193458A JPH0865201A (en) | 1994-08-18 | 1994-08-18 | Mobile communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0865201A true JPH0865201A (en) | 1996-03-08 |
Family
ID=16308344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6193458A Pending JPH0865201A (en) | 1994-08-18 | 1994-08-18 | Mobile communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0865201A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998013956A1 (en) * | 1996-09-25 | 1998-04-02 | Matsushita Electric Industrial Co., Ltd. | Base station equipment for mobile communication |
| US5859875A (en) * | 1996-10-01 | 1999-01-12 | Uniden Corporation | Transmitter, receiver, communication system, and communication method employing spread spectrum communication technique |
| US6470188B1 (en) | 1996-12-26 | 2002-10-22 | Ntt Mobile Communications Network, Inc. | Method for handover |
| US6535494B1 (en) | 1998-03-06 | 2003-03-18 | Nec Corporation | CDMA mobile telecommunication method and system |
| WO2004042961A1 (en) * | 2002-11-07 | 2004-05-21 | Sony Ericsson Mobile Communications Japan, Inc. | Radio transmitting/receiving apparatus |
| US7120457B2 (en) | 1996-11-27 | 2006-10-10 | Hitachi, Ltd. | Transmission control method and apparatus for mobile communication system |
| JP2007043755A (en) * | 2006-11-06 | 2007-02-15 | Toshiba Corp | Radio communication system and radio communication method |
| US7260398B2 (en) | 2000-09-20 | 2007-08-21 | Fujitsu Limited | Mobile communication system for performing hand-off based on communication resources in base stations |
| JP2007274117A (en) * | 2006-03-30 | 2007-10-18 | Nec Corp | Receiver and mobile communication terminal |
| JP2010288104A (en) * | 2009-06-12 | 2010-12-24 | Hitachi Ltd | Base station device and interference reducing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04157821A (en) * | 1990-10-20 | 1992-05-29 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication device |
| JPH06141018A (en) * | 1992-10-23 | 1994-05-20 | Yamatake Honeywell Co Ltd | Transmitter and receiver for spread spectrum communication |
| JPH0766760A (en) * | 1993-08-26 | 1995-03-10 | Mitsubishi Electric Corp | Spread spectrum time diversity communication equipment |
-
1994
- 1994-08-18 JP JP6193458A patent/JPH0865201A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04157821A (en) * | 1990-10-20 | 1992-05-29 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication device |
| JPH06141018A (en) * | 1992-10-23 | 1994-05-20 | Yamatake Honeywell Co Ltd | Transmitter and receiver for spread spectrum communication |
| JPH0766760A (en) * | 1993-08-26 | 1995-03-10 | Mitsubishi Electric Corp | Spread spectrum time diversity communication equipment |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6119004A (en) * | 1996-09-25 | 2000-09-12 | Matsushita Electric Industrial Co., Ltd. | Base station equipment for mobile communication |
| WO1998013956A1 (en) * | 1996-09-25 | 1998-04-02 | Matsushita Electric Industrial Co., Ltd. | Base station equipment for mobile communication |
| US5859875A (en) * | 1996-10-01 | 1999-01-12 | Uniden Corporation | Transmitter, receiver, communication system, and communication method employing spread spectrum communication technique |
| US7120457B2 (en) | 1996-11-27 | 2006-10-10 | Hitachi, Ltd. | Transmission control method and apparatus for mobile communication system |
| US7421283B2 (en) | 1996-11-27 | 2008-09-02 | Hitachi Communication Technologies, Ltd. | Transmission power control method and apparatus for mobile communication system |
| US6470188B1 (en) | 1996-12-26 | 2002-10-22 | Ntt Mobile Communications Network, Inc. | Method for handover |
| US6591104B2 (en) | 1996-12-26 | 2003-07-08 | Ntt Mobile Communications Network, Inc. | Method for handover |
| US6535494B1 (en) | 1998-03-06 | 2003-03-18 | Nec Corporation | CDMA mobile telecommunication method and system |
| US7260398B2 (en) | 2000-09-20 | 2007-08-21 | Fujitsu Limited | Mobile communication system for performing hand-off based on communication resources in base stations |
| US7599695B2 (en) | 2000-09-20 | 2009-10-06 | Fujitsu Limited | Mobile communication system in which communication resources are allocated based on traffic congestion |
| WO2004042961A1 (en) * | 2002-11-07 | 2004-05-21 | Sony Ericsson Mobile Communications Japan, Inc. | Radio transmitting/receiving apparatus |
| US7200422B2 (en) | 2002-11-07 | 2007-04-03 | Sony Ericsson Mobile Communications Japan, Inc. | Radio transmitting/receiving apparatus |
| JP2007274117A (en) * | 2006-03-30 | 2007-10-18 | Nec Corp | Receiver and mobile communication terminal |
| JP2007043755A (en) * | 2006-11-06 | 2007-02-15 | Toshiba Corp | Radio communication system and radio communication method |
| JP2010288104A (en) * | 2009-06-12 | 2010-12-24 | Hitachi Ltd | Base station device and interference reducing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6937582B1 (en) | Method and an arrangement relating to mobile radio systems with the possibility of switching channel coding schemes | |
| US6195567B1 (en) | Antenna system for a cellular telephone network | |
| KR100362074B1 (en) | A cellular system, a mobile station and a base station used in a cellular system | |
| AU2003202868C1 (en) | Method and apparatus for controlling communications of data from multiple base stations to a mobile station in a communication system | |
| JP2751869B2 (en) | Transmit diversity method | |
| EP1370106B1 (en) | Method and apparatus for reducing the average downlink transmitted power from base stations during soft handoff | |
| EP0869629B1 (en) | Soft handover method in a sectored base station and base station therefor | |
| KR100276698B1 (en) | Forward link power control apparatus and method with interference reduction during soft handoff in CDMA communication systems | |
| KR100292638B1 (en) | Radio communication method and radio communication apparatus | |
| EP1108338B1 (en) | Mobile terminal initiated and assisted antenna selection | |
| US6252864B1 (en) | CDMA communication apparatus and CDMA communication method | |
| US20030129982A1 (en) | Soft handoff in a wireless communication system | |
| US20060025128A1 (en) | Soft roaming method used in wireless LAN and station system using the same | |
| IL111433A (en) | Method and apparatus for performing handoff between sectors of a common base station | |
| JP2000125333A (en) | Mobile communication system adopting cdma method | |
| US6907014B1 (en) | Apparatus and method for TDMA-TDD based transmission/reception | |
| JP3240262B2 (en) | Adaptive modulation transmission method and system | |
| JPH0865201A (en) | Mobile communication equipment | |
| JPH10163936A (en) | Radio communication equipment | |
| JPH05259950A (en) | Diversity system for mobile communication-frequency mutual communication system | |
| US6404778B1 (en) | Radio communication apparatus | |
| US20050048922A1 (en) | Reverse link combination device and method in a mobile communication system supporting a softer handoff | |
| JP3380515B2 (en) | Communication terminal device and signal determination method in communication terminal device | |
| KR20010051893A (en) | Mobile radio terminal | |
| US20050186964A1 (en) | Mobile station |