JPH11298398A - Signal quality detection method in mobile communication and control method for mobile station - Google Patents

Signal quality detection method in mobile communication and control method for mobile station

Info

Publication number
JPH11298398A
JPH11298398A JP9735798A JP9735798A JPH11298398A JP H11298398 A JPH11298398 A JP H11298398A JP 9735798 A JP9735798 A JP 9735798A JP 9735798 A JP9735798 A JP 9735798A JP H11298398 A JPH11298398 A JP H11298398A
Authority
JP
Japan
Prior art keywords
mobile station
communication
mobile
wireless channel
signal 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.)
Granted
Application number
JP9735798A
Other languages
Japanese (ja)
Other versions
JP3830068B2 (en
Inventor
Hisashi Nakagome
寿 中込
Tadao Takami
忠雄 鷹見
Kiyoto Nagata
清人 永田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
NTT Mobile Communications Networks Inc
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.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp, NTT Mobile Communications Networks Inc filed Critical Nippon Telegraph and Telephone Corp
Priority to JP09735798A priority Critical patent/JP3830068B2/en
Publication of JPH11298398A publication Critical patent/JPH11298398A/en
Application granted granted Critical
Publication of JP3830068B2 publication Critical patent/JP3830068B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • Y02B60/50

Landscapes

  • Monitoring And Testing Of Transmission In General (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PROBLEM TO BE SOLVED: To detect the quality of a peripheral radio channel without providing a dedicated receiver on a mobile station side in mobile communication for performing multiple access by a CDMA system. SOLUTION: In the case of performing the multiple access of a base station 2c and a mobile station by the CDMA system, the base station 2c divides communication information and control information into plural slots and transmits them so as to transmit the control information for controlling the mobile station to the mobile station and the mobile station detects the one without the presence of the communication information among the respective slots, receives radio channels from the base stations 2a, 2b and 2d adjacent to the base station 2c or the like in the period and detects the signal quality.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明は、移動局と固定局と
の多元接続をCDMA方式によって行う移動通信におけ
る信号品質検出方法、および、移動局の制御方法に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting signal quality in mobile communication in which multiple access between a mobile station and a fixed station is performed by CDMA, and a control method for the mobile station.

【0002】[0002]

【従来の技術】移動通信は、広く普及しており、その多
元接続(マルチプルアクセス)方式として、TDMA
(時分割多元接続)方式などが採用されているが、近
年、周波数利用効率が良い、伝送速度を変更し易い、盗
聴されにくい等の利点を有するCDMA(符号分割多元
接続)方式が採用されつつある。
2. Description of the Related Art Mobile communication has become widespread, and TDMA is used as a multiple access method.
Although a (time division multiple access) system or the like is adopted, in recent years, a CDMA (code division multiple access) system having advantages such as good frequency use efficiency, easy change of transmission speed, and low eavesdropping has been adopted. is there.

【0003】ところで、携帯電話のような移動局が、あ
る基地局により設定された無線チャネルで待受中あるい
は通信中である場合において、その移動局が移動する
と、その無線チャネルの信号品質が変動することにな
る。そこで、移動局は、より良い品質の無線チャネルを
確保すべく、第1に、待受あるいは通信で使用している
無線チャネルとは異なる無線チャネル(現時点において
無線通信を行っている無線チャネルとは異なる無線チャ
ネルと、現時点において無線通信を行っている基地局に
隣接している基地局の無線チャネルとの双方を含む)を
受信してその信号品質を検出し、第2に、待受あるいは
通信で使用している無線チャネルの品質と比較し、第3
に、比較の結果、品質の高い無線チャネルに切り換える
制御を行う構成となっている。
When a mobile station such as a mobile phone is waiting or communicating on a radio channel set by a certain base station, when the mobile station moves, the signal quality of the radio channel fluctuates. Will do. Therefore, in order to secure a radio channel of better quality, the mobile station firstly sets a radio channel different from the radio channel used for standby or communication (the radio channel currently used for radio communication is (Including both different radio channels and a radio channel of a base station adjacent to the base station currently performing radio communication) to detect the signal quality thereof. Compared to the quality of the wireless channel used in
In addition, as a result of the comparison, control is performed to switch to a high-quality wireless channel.

【0004】ここで、TDMA方式の多元接続は、同一
無線周波数の使用時間を各ユーザ毎に分割することで行
われる。すなわち、無線チャネルが、1フレームにおけ
る1つの無線周波数の使用時間を複数に分割したタイム
スロットで規定され、異なるタイムスロットが各ユーザ
によって使用される。このようなTDMA方式の移動通
信システムにおいては、ユーザが使用しないタイムスロ
ットを特別に設けて、このスロット期間中に、待受ある
いは通信で使用している無線チャネルとは異なる無線チ
ャネルの信号品質を検出し、待受あるいは通信で使用し
ている無線チャネルの品質と比較して、品質の高い無線
チャネルに切り換える制御が実行される。
Here, the multiple access in the TDMA system is performed by dividing the use time of the same radio frequency for each user. That is, a radio channel is defined by time slots obtained by dividing the use time of one radio frequency in one frame into a plurality of times, and different time slots are used by each user. In such a TDMA mobile communication system, a time slot not used by a user is specially provided, and during this slot, the signal quality of a radio channel different from the radio channel used for standby or communication is set. Control is performed to detect and switch to a higher quality wireless channel compared to the quality of the wireless channel used for standby or communication.

【0005】これに対し、CDMA方式の多元接続は、
同一の無線周波数においてユーザ毎に異なる符号を用い
ることで実現される。このため、CDMA方式では、多
元接続のためだけに、同一無線周波数の使用時間が分割
されることはないので、無線チャネルの品質を測定する
ためのスロットあるいはフレームも特別には用意されな
い。したがって、CDMA方式の移動通信システムにお
いて、通信で使用している無線チャネルとは異なる無線
チャネルを受信して、その品質を検出するには、例え
ば、図6に示されるように、通信で使用するための受信
機と、それとは異なる無線チャネルを受信して、その品
質を検出するための受信機との2系統の受信機が必要と
なる。
On the other hand, the multiple access of the CDMA system is
This is realized by using different codes for each user in the same radio frequency. For this reason, in the CDMA system, the use time of the same radio frequency is not divided only for multiple access, so that no special slot or frame for measuring the quality of the radio channel is prepared. Therefore, in a CDMA mobile communication system, in order to receive a radio channel different from the radio channel used for communication and to detect the quality thereof, for example, as shown in FIG. , And a receiver for receiving a different wireless channel and detecting the quality thereof are required.

【0006】なお、図6に示される受信機の1系統は、
おもに、第1に、アンテナで受信した信号を、シンセサ
イザによる信号との混合(乗算)によって処理周波数帯
に変換する周波数変換器と、第2に、周波数変換された
信号をQPSK(4相位相変調)検波するための2組の
PSK検波器とから構成される。すなわち、シンセサイ
ザから各PSK検波器に供給される搬送波の位相は互い
にπ/2だけずれている。そして、ベースバンド部が、
通信用の受信機により検波された同相信号および直交信
号から、基地局から受信した信号に対して所定の処理を
実行して通信を行うとともに、通信で使用している無線
チャネルの品質を検出する一方、他方の受信機により検
波された同相信号および直交信号から、現時点において
通信で使用している無線チャネルとは異なる無線チャネ
ルの品質を検出して、各無線チャネルの品質を互いに比
較する構成となっている。
[0006] One system of the receiver shown in FIG.
Mainly, first, a frequency converter that converts a signal received by an antenna into a processing frequency band by mixing (multiplication) with a signal from a synthesizer, and second, a QPSK (four-phase modulation) ) Two sets of PSK detectors for detection. That is, the phases of the carrier waves supplied from the synthesizer to each PSK detector are shifted from each other by π / 2. And the baseband part,
From the in-phase signal and quadrature signal detected by the communication receiver, perform predetermined processing on the signal received from the base station to perform communication, and detect the quality of the wireless channel used for communication. On the other hand, from the in-phase signal and the quadrature signal detected by the other receiver, the quality of a wireless channel different from the wireless channel currently used for communication is detected, and the quality of each wireless channel is compared with each other. It has a configuration.

【0007】[0007]

【発明が解決しようとする課題】ところで、移動局とし
ての携帯電話には、最近、小型・軽量化の要求が著しい
が、通信中に、隣接基地局による無線チャネルの品質を
検出するために、通信に用いる受信機とは別に専用の品
質検出用の受信機を別途設ける構成は、この要求に反し
ているといえる。また、携帯電話は、基本的に二次電池
を電源とするため、消費電力を低く抑える点も重要であ
るが、2系統の受信機を移動局に設ける構成は、低消費
電力化にも逆行するといえる。
In recent years, there has been a remarkable demand for smaller and lighter portable telephones as mobile stations. However, in order to detect the quality of radio channels by adjacent base stations during communication, A configuration in which a dedicated quality detection receiver is provided separately from a receiver used for communication can be said to be contrary to this requirement. In addition, since mobile phones basically use a secondary battery as a power source, it is also important to keep power consumption low. However, a configuration in which two types of receivers are provided in a mobile station goes against low power consumption. I can say that.

【0008】なお、無線チャネルの品質検出および無線
チャネルの切換制御を、移動局側ではなく、固定基地局
側において実行する構成も一応考えられる。しかしなが
ら、このような構成では、各基地局に、品質検出用の受
信機を各移動局に対応して別途設ける必要があるととも
に、基地局を含む網側での処理の負担が増加するため、
多数の移動局の同時使用が想定される今日にあっては、
非現実的な解決策といえる。
[0008] A configuration in which the quality detection of the radio channel and the switching control of the radio channel are executed not on the mobile station side but on the fixed base station side is conceivable. However, in such a configuration, it is necessary to separately provide a receiver for quality detection in each base station corresponding to each mobile station, and the processing load on the network side including the base station increases,
Today, when many mobile stations are expected to be used simultaneously,
This is an unrealistic solution.

【0009】本発明は、このような事情に鑑みてなされ
たものであり、その目的とするところは、CDMA方式
によって多元接続を行う移動通信において、周辺無線チ
ャネルの品質を、移動局側において専用の受信機を設け
ることなく検出して、移動局の小型・軽量・低消費電力
化とともに、基地局側の負荷を大幅に軽減することが可
能な移動通信における信号品質検出方法、および、移動
局の制御方法を提供することにある。
[0009] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a mobile communication system that performs multiple access by the CDMA system, and that the quality of a peripheral radio channel is exclusively used by the mobile station. Signal quality detection method in mobile communication capable of detecting without providing a receiver, reducing the size, weight and power consumption of the mobile station and greatly reducing the load on the base station side, and a mobile station Is to provide a control method.

【0010】[0010]

【課題を解決するための手段】上記目的を達成するた
め、請求項1記載の発明にあっては、CDMA方式によ
って基地局と移動局との多元接続を行うとともに、前記
基地局が前記移動局を制御するための制御情報と前記移
動局への通信情報とを複数のスロットに分割した無線チ
ャネルで送信する移動通信であって、各スロットのう
ち、通信情報の存在しないものを前記移動局で検出する
過程と、通信情報の存在しないスロットの期間に、前記
無線チャネルとは異なる無線チャネルを受信して、その
信号品質を検出する過程とを備えることを特徴としてい
る。
To achieve the above object, according to the first aspect of the present invention, a multiple access between a base station and a mobile station is performed by a CDMA system, and the base station is connected to the mobile station. Mobile communication that transmits control information for controlling the communication information and communication information to the mobile station on a wireless channel divided into a plurality of slots, and among the slots, a mobile communication station that does not have communication information is transmitted by the mobile station. It is characterized by comprising a step of detecting, and a step of receiving a radio channel different from the radio channel during a slot in which no communication information exists and detecting the signal quality thereof.

【0011】この方法によれば、通信情報の存在しない
スロットを検出して、その期間において、現時点におい
て使用している無線チャネルとは異なる無線チャネルを
受信し、その信号品質を検出するので、移動局におい
て、品質検出用の受信機を、通信用受信機と別途に設け
る必要がなくなる。このため、移動局の小型・軽量・低
消費電力化を図ることが可能となる。ここで、現時点に
おいて使用している無線チャネルと異なる無線チャネル
とは、現時点において無線通信を行っている無線チャネ
ルとは異なる無線チャネルと、現時点において無線通信
を行っている基地局に隣接している基地局の無線チャネ
ルとの双方を含む。
According to this method, a slot in which communication information does not exist is detected, a radio channel different from the radio channel currently used is received during that period, and its signal quality is detected. In the station, there is no need to provide a receiver for quality detection separately from a receiver for communication. Therefore, it is possible to reduce the size, weight, and power consumption of the mobile station. Here, the wireless channel different from the wireless channel currently used is a wireless channel different from the wireless channel currently performing wireless communication and is adjacent to the base station currently performing wireless communication. Includes both base station radio channels.

【0012】また、上記目的を達成するため、請求項3
記載の発明にあっては、CDMA方式によって基地局と
移動局との多元接続を行うとともに、前記基地局が前記
移動局を制御するための制御情報と前記移動局への通信
情報とを複数のスロットに分割した無線チャネルで送信
する移動通信であって、前記制御情報と前記通信情報と
を送信しないように予め割り当てられた特定のスロット
の期間に、前記無線チャネルとは異なる無線チャネルを
受信して、その信号品質を検出する過程とを備えること
を特徴としている。
[0012] In order to achieve the above object, the present invention provides a third aspect.
In the invention described above, a multiple access between a base station and a mobile station is performed by a CDMA system, and control information for the base station to control the mobile station and communication information to the mobile station are transmitted by a plurality of mobile stations. A mobile communication transmitting on a radio channel divided into slots, and receiving a radio channel different from the radio channel during a period of a specific slot previously allocated so as not to transmit the control information and the communication information. And a step of detecting the signal quality.

【0013】この方法によれば、通信情報の存在しない
特定のスロットにおいて、現時点において使用している
無線チャネルとは異なる無線チャネルを受信し、その信
号品質を検出するので、移動局において、品質検出用の
受信機を、通信用受信機と別途に設ける必要がなくな
る。このため、請求項1記載の発明と同様に、移動局の
小型・軽量・低消費電力化を図ることが可能となる。
According to this method, in a specific slot in which no communication information exists, a radio channel different from the radio channel currently used is received and its signal quality is detected. It is not necessary to provide a receiver for communication separately from a receiver for communication. Therefore, similarly to the first aspect, it is possible to reduce the size, weight, and power consumption of the mobile station.

【0014】くわえて、請求項2または4記載の発明に
あっては、請求項1または3記載の発明において、さら
に、待受あるいは通信で使用している無線チャネルの信
号品質と、前記無線チャネルとは異なる無線チャネルの
信号品質とを比較する過程と、比較の結果、品質の良好
な無線チャネルに接続を切り換える過程とを備えること
を特徴としている。この方法によれば、移動局主導でゾ
ーン移行およびハンドオーバに伴う無線チャネルの切換
制御が実行されるので、基地局側の負荷を大幅に低減す
ることも可能となる。
[0014] In addition, according to the invention of claim 2 or 4, in the invention of claim 1 or 3, further, the signal quality of a radio channel used for standby or communication and the radio channel And a step of switching the connection to a wireless channel having good quality as a result of the comparison. According to this method, since the switching control of the radio channel accompanying the zone shift and the handover is executed under the initiative of the mobile station, the load on the base station side can be greatly reduced.

【0015】[0015]

【発明の実施の形態】以下、本発明の実施形態について
図面を参照して説明する。図1は、本発明の実施形態に
かかる移動通信システムの構成を示すブロック図であ
る。この図において、移動局1は、基地局2a〜のいず
れともCDMA方式による無線通信を確立する機能を有
する。各基地局2a〜は、それぞれに割り当てられた無
線ゾーン領域3a〜での通信を担当し、それぞれが基地
局制御局4によって制御される。一方、サービス制御局
5は、公衆回線網6に接続されて、複数の(図示の例で
は1つであるが)交換局7を統括している。このような
構成において、移動局1が無線ゾーン領域3bに在圏し
ている場合に、その移動局1への着信呼が発生すると、
周知の方法によって、サービス制御局5から移動局1が
在圏する無線ゾーン領域3bの基地局2bまでの接続経
路が設定されて、その移動局1が呼び出される構成とな
っている。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a mobile communication system according to an embodiment of the present invention. In this figure, a mobile station 1 has a function of establishing wireless communication with any of the base stations 2a to 2 by the CDMA method. Each base station 2a ~ is responsible for communication in the wireless zone area 3a ~ assigned to it, and each is controlled by the base station control station 4. On the other hand, the service control station 5 is connected to a public line network 6 and controls a plurality of switching stations 7 (one in the illustrated example). In such a configuration, when the mobile station 1 is located in the wireless zone area 3b and an incoming call to the mobile station 1 occurs,
The connection route from the service control station 5 to the base station 2b in the wireless zone area 3b where the mobile station 1 is located is set by a known method, and the mobile station 1 is called.

【0016】ここで、本実施形態にかかる移動通信シス
テムにおいて、基地局から移動局への信号を送出する際
に用いられる無線チャネルのフォーマットの一例につい
て、図2を参照して説明する。この図に示されるよう
に、この無線チャネルは、1フレームが例えば16個に
分割されたスロットの繰返しパターンとなっている。こ
こで、各スロットには、同図に示されるように、音声情
報の先頭部分に同期情報が付加された形で配置してい
る。この同期情報は、移動局1が音声情報を、各スロッ
トにおいて同期して受信するために用いられる。なお、
本実施形態における多元接続は、同一の無線周波数にお
いてユーザ毎に異なる符号を用いるCDMA方式で実現
される。このため、本実施形態において、無線チャネル
を複数のスロットに分割しているのは、多元接続のため
ではなく、同期情報のような制御情報を、同一の無線チ
ャネルを用いて、音声情報とともに移動局1へ送出する
ためである。
Here, an example of a format of a radio channel used when transmitting a signal from a base station to a mobile station in the mobile communication system according to the present embodiment will be described with reference to FIG. As shown in this figure, this wireless channel has a repeating pattern of slots in which one frame is divided into, for example, 16 slots. Here, as shown in the figure, the slots are arranged such that synchronization information is added to the head of the audio information. This synchronization information is used for the mobile station 1 to receive voice information synchronously in each slot. In addition,
Multiple access in the present embodiment is realized by a CDMA system using different codes for each user at the same radio frequency. For this reason, in the present embodiment, the radio channel is divided into a plurality of slots not for multiple access, but for moving control information such as synchronization information together with voice information using the same radio channel. This is for transmitting to the station 1.

【0017】次に、本実施形態にかかる移動通信システ
ムにおける移動局の受信動作について説明する。ここで
は、説明の便宜上、移動局1が、無線ゾーン3bに在圏
して、すでに基地局2bとの通信経路が確立した状態を
想定する。基地局2bから移動局1への無線チャネルが
図3(a)に示されるように規定されている場合、移動
局1は、音声データが存在しないスロットを検出し、そ
のスロットの期間において、通信経路が確立された基地
局2bに隣接する基地局2a、2c、2dからの無線チ
ャネルと、すでに通信経路が確立された基地局2bによ
る無線チャネルであって、現時点において使用している
無線チャネルとは異なる無線チャネルとを受信する。そ
して、移動局1は、受信結果から信号品質を検出して、
各無線チャネルの信号品質を相互に比較する。
Next, the reception operation of the mobile station in the mobile communication system according to the present embodiment will be described. Here, for convenience of explanation, it is assumed that mobile station 1 is located in wireless zone 3b and a communication path with base station 2b has already been established. When a wireless channel from the base station 2b to the mobile station 1 is defined as shown in FIG. 3A, the mobile station 1 detects a slot in which no voice data exists, and performs communication during the slot. The radio channels from the base stations 2a, 2c, and 2d adjacent to the base station 2b for which the route has been established, and the radio channels used by the base station 2b for which the communication route has already been established and which are currently used. Receive different radio channels. Then, the mobile station 1 detects the signal quality from the reception result,
The signal quality of each wireless channel is compared with each other.

【0018】この比較の結果、現時点において使用して
いる無線チャネルの信号品質が最良である場合には、そ
の通信経路をそのまま維持する一方、現時点において使
用している無線チャネルとは異なる無線チャネルの信号
品質が最良である場合には、その最良な無線チャネルへ
と切り換える制御を実行する。ここで、後者の場合に
は、現時点において無線通信を行っている基地局2bに
隣接する基地局2a、2cあるいは2dのいずれかによ
る無線チャネルへと切り換える場合と、現時点において
無線通信を行っている基地局2bによる無線チャネルで
あって、現時点において使用している無線チャネルとは
異なる無線チャネルへと切り換える場合との2通りの場
合がある。
As a result of this comparison, if the signal quality of the radio channel currently used is the best, the communication path is maintained as it is, while the radio channel different from the radio channel currently used is maintained. If the signal quality is the best, control is performed to switch to the best wireless channel. Here, in the latter case, switching to a wireless channel by any of the base stations 2a, 2c, and 2d adjacent to the base station 2b that is currently performing wireless communication, and performing wireless communication at the present time. There are two cases, a case where the wireless channel is switched to a wireless channel different from the wireless channel currently used by the base station 2b.

【0019】なお、音声データを各スロットに分ける
と、その処理に多少の時間を要する。このため、例え
ば、図3(b)に示されるように、音声データがスロッ
トS1、S5の期間においてそれぞれ存在しない場合、
実際には、移動局1は、図3(c)に示されるように、
スロットS1、S5に対して1スロット遅延したスロッ
トS2、S6の各期間において、基地局2bによる無線
チャネルの受信を中断する一方、図3(d)に示される
ように、それとは異なる無線チャネルを受信する。ま
た、移動局1は、各スロットの先頭部分に位置する同期
情報については受信するので、厳密に言えば、各スロッ
トにおいて、音声データが存在しない音声情報の期間に
おいて、異なる無線チャネルを受信する。図3(c)に
おいて、移動局1がスロットS2、S5の先頭部分で基
地局2cの受信動作を実行しているのは、このことを意
味する。さらに、通信中に限られず、待ち受け中に無線
チャネルの切り換え制御を実行しても良いのはもちろん
である。
If audio data is divided into slots, it takes some time to process the data. For this reason, for example, as shown in FIG. 3B, when audio data does not exist in the periods of the slots S1 and S5,
Actually, the mobile station 1, as shown in FIG.
In each of the slots S2 and S6 delayed by one slot with respect to the slots S1 and S5, the reception of the radio channel by the base station 2b is interrupted, and as shown in FIG. Receive. Also, since the mobile station 1 receives the synchronization information located at the head of each slot, strictly speaking, it receives a different wireless channel in each slot during the period of audio information in which no audio data exists. In FIG. 3C, this means that the mobile station 1 is executing the receiving operation of the base station 2c at the beginning of the slots S2 and S5. Further, it is needless to say that the switching control of the wireless channel is not limited to during the communication and may be performed during the standby.

【0020】このような移動通信システムによれば、移
動局1が、音声データの存在しないスロットを検出し
て、その期間において、現時点において使用している無
線チャネルとは異なる無線チャネルを受信して、その信
号品質を検出するので、移動局において、品質検出用の
受信機を、通信用受信機と別途に設ける必要がなくなっ
て兼用可能となるため、受信機が図5に示されるように
1系統で済む。このため、移動局の小型・軽量・低消費
電力化を図ることが可能となる。また、移動局主導で無
線チャネルを切換制御が実行されるので、基地局側の負
荷を大幅に低減することが可能となる。
According to such a mobile communication system, the mobile station 1 detects a slot in which no voice data exists, and receives a radio channel different from the radio channel currently used during that period. Since the signal quality is detected, the mobile station does not have to provide a quality detection receiver separately from the communication receiver, and the mobile station can also use the same. Therefore, as shown in FIG. Only the system is needed. Therefore, it is possible to reduce the size, weight, and power consumption of the mobile station. In addition, since the switching control of the wireless channel is executed under the initiative of the mobile station, the load on the base station can be significantly reduced.

【0021】次に、上記実施形態とは別の方法によっ
て、移動局の小型・軽量・低消費電力化を図るととも
に、移動局主導で無線チャネルを切換制御が実行する実
施形態について説明する。なお、本実施形態にかかる移
動通信システムにおいても、説明の便宜上、移動局1
が、無線ゾーン3bに在圏して、すでに基地局2bとの
通信経路が確立した状態を想定する。
Next, an embodiment will be described in which the mobile station is reduced in size, weight, and power consumption by a method different from the above embodiment, and the switching control of the radio channel is executed under the initiative of the mobile station. In the mobile communication system according to the present embodiment, for convenience of explanation, the mobile station 1
Is assumed to be in the wireless zone 3b and a communication path with the base station 2b has already been established.

【0022】本実施形態にかかる移動通信システムにあ
っては、基地局2bから移動局1への情報を送出する場
合、1フレームのうち予め1以上割り当てておく。そし
て、移動局1は、このスロットの期間において、第1
に、通信経路が確立された基地局2bに隣接する基地局
2a、2c、2dからの無線チャネルと、すでに通信経
路が確立された基地局2bによる無線チャネルであっ
て、現時点において使用している無線チャネルとは異な
る無線チャネルとを受信し、第2に、受信結果から信号
品質を検出して、各無線チャネルの信号品質を相互に比
較して、第3に、比較の結果、最良である信号品質の無
線チャネルへと切り換える制御を実行する。
In the mobile communication system according to the present embodiment, when transmitting information from the base station 2b to the mobile station 1, one or more frames are allocated in advance in one frame. Then, during the slot period, the mobile station 1
The wireless channels from the base stations 2a, 2c, and 2d adjacent to the base station 2b with the established communication path and the wireless channels from the base station 2b with the established communication path are currently used. A radio channel different from the radio channel is received. Second, the signal quality is detected from the reception result, and the signal quality of each radio channel is compared with each other. Third, the result of the comparison is the best. Control to switch to a wireless channel of signal quality is executed.

【0023】例えば、基地局2bから移動局1への無線
チャネルが図4(a)に示されるように規定されている
場合、同図(b)に示されるように、空きスロットとし
てS1〜S3を割り当てておく一方、移動局1が、これ
らのスロットS1〜S3の期間において、同図(c)に
示されるように、現時点において使用している無線チャ
ネルとは異なる無線チャネルを受信して、その信号品質
を検出する。
For example, when a radio channel from the base station 2b to the mobile station 1 is defined as shown in FIG. 4A, as shown in FIG. On the other hand, the mobile station 1 receives a wireless channel different from the wireless channel currently used, as shown in FIG. Detect the signal quality.

【0024】このような移動通信システムによれば、移
動局が、予め空きとして割り当てら得たスロットの期間
において、現時点において使用している無線チャネルと
は異なる無線チャネルを受信して、その信号品質を検出
するので、先に述べた実施形態と同様に、移動局におい
て、品質検出用の受信機を、通信用受信機と別途に設け
る必要がなくなって兼用可能となるため、受信機が図5
に示されるように1系統で済むので、移動局の小型・軽
量・低消費電力化を図ることが可能となり、また、移動
局主導で無線チャネルを切換制御が実行されるので、基
地局側の負荷を大幅に低減することも可能となる。な
お、通信中に限られず、待ち受け中に無線チャネルの切
り換え制御を実行しても良いのはもちろんである。
[0024] According to such a mobile communication system, the mobile station receives a radio channel different from the radio channel currently used during the period of the slot previously allocated as empty, and receives the signal quality. Since the mobile station does not need to provide a quality detection receiver separately from the communication receiver in the same manner as in the above-described embodiment, the mobile station can use the quality detection receiver as shown in FIG.
Since only one system is required as shown in (1), it is possible to reduce the size, weight and power consumption of the mobile station, and since the switching control of the radio channel is executed under the initiative of the mobile station, the base station side The load can be significantly reduced. It is needless to say that the control of switching the wireless channel is not limited to during communication and may be performed during standby.

【0025】<変形例>本発明は上述した実施形態に限
られることなく、次のような変形が可能である。すなわ
ち、実施形態にあっては、通信情報の例として音声情報
に挙げて説明したが、本発明は、これに限られず、例え
ば、パケットデータのようなものであっても良い。ま
た、上述した実施形態にあっては、移動局を制御する制
御情報の例として、通信情報を同期受信するための同期
情報を挙げて説明したが、本発明は、これに限られず、
例えば、移動局に対して送信電力の増減を適応的に指示
する情報やデータ、各種のパイロット信号であっても良
い。この際、各スロットに複数の異なる制御情報を含ま
せて送信しても良いのはもちろんである。
<Modifications> The present invention is not limited to the above-described embodiment, and the following modifications are possible. That is, in the embodiment, the audio information has been described as an example of the communication information. However, the present invention is not limited to this, and may be, for example, packet data. Further, in the above-described embodiment, as an example of the control information for controlling the mobile station, the synchronization information for synchronously receiving the communication information has been described. However, the present invention is not limited thereto.
For example, information and data that adaptively instruct the mobile station to increase or decrease the transmission power and various pilot signals may be used. At this time, it goes without saying that a plurality of different control information may be transmitted in each slot.

【0026】[0026]

【発明の効果】以上説明したように本発明によれば、C
DMA方式によって多元接続を行う移動通信において、
周辺無線チャネルの品質を、移動局側において専用の受
信機を設けることなく検出して、移動局の小型・軽量・
低消費電力化を図ることが可能となる。さらに、移動局
において通信品質が検出されて、移動局主導でゾーン移
行およびハンドオーバに伴う無線チャネルの切換制御が
実行されるので、基地局側の負荷を大幅に低減して、基
地局側の負荷を大幅に軽減することも可能となる。
As described above, according to the present invention, C
In mobile communication that performs multiple access by the DMA method,
The quality of the peripheral radio channel is detected without providing a dedicated receiver on the mobile station side.
Low power consumption can be achieved. Furthermore, since the mobile station detects the communication quality and performs the switching control of the radio channel accompanying the zone shift and the handover under the initiative of the mobile station, the load on the base station side is greatly reduced, and the load on the base station side is reduced. Can be greatly reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明の実施形態にかかる移動通信システム
の構成を示すブロック図である。
FIG. 1 is a block diagram illustrating a configuration of a mobile communication system according to an embodiment of the present invention.

【図2】 同移動通信システムの無線チャネルについて
のフォーマットの一例を示す図である。
FIG. 2 is a diagram showing an example of a format for a radio channel of the mobile communication system.

【図3】 (a)〜(d)は、それぞれ同移動通信シス
テムの信号品質の動作を説明するための図である。
FIGS. 3A to 3D are diagrams for explaining signal quality operations of the mobile communication system.

【図4】 (a)〜(c)は、それぞれ本発明の他の実
施形態にかかる移動通信システムの信号品質の動作を説
明するための図である。
FIGS. 4A to 4C are diagrams for explaining signal quality operations of a mobile communication system according to another embodiment of the present invention.

【図5】 本発明の実施形態による受信機の要部構成を
示すブロック図である。
FIG. 5 is a block diagram illustrating a main configuration of a receiver according to the embodiment of the present invention.

【図6】 従来の受信機の要部構成を示すブロック図で
ある。
FIG. 6 is a block diagram showing a main configuration of a conventional receiver.

【符号の説明】[Explanation of symbols]

1……移動局、 2a〜……基地局、 3a〜……無線ゾーン、 4……基地局制御局、 5……サービス制御局、 6……公衆回線網、 7……交換局 1 ... mobile station, 2a-... base station, 3a-... radio zone, 4 ... base station control station, 5 ... service control station, 6 ... public line network, 7 ... switching station

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 CDMA方式によって基地局と移動局と
の多元接続を行うとともに、前記基地局が前記移動局を
制御するための制御情報と前記移動局への通信情報とを
複数のスロットに分割した無線チャネルで送信する移動
通信であって、 各スロットのうち、通信情報の存在しないものを前記移
動局で検出する過程と、 通信情報の存在しないスロットの期間に、前記無線チャ
ネルとは異なる無線チャネルを受信して、その信号品質
を検出する過程とを備えることを特徴とする移動通信に
おける信号品質検出方法。
1. A multiple access between a base station and a mobile station is performed by a CDMA system, and control information for the base station to control the mobile station and communication information to the mobile station are divided into a plurality of slots. A mobile communication to be transmitted on a wireless channel, wherein the mobile station detects a slot having no communication information among the slots, and a radio which is different from the wireless channel during a slot in which no communication information exists. Receiving a channel and detecting the signal quality of the channel.
【請求項2】 請求項1記載の移動通信における信号品
質検出方法において、さらに、 待受あるいは通信で使用している無線チャネルの信号品
質と、前記無線チャネルとは異なる無線チャネルの信号
品質とを比較する過程と、 比較の結果、品質の良好な無線チャネルに接続を切り換
える過程とを備えることを特徴とする移動通信における
移動局の制御方法。
2. The method for detecting signal quality in mobile communication according to claim 1, further comprising: determining a signal quality of a wireless channel used in standby or communication and a signal quality of a wireless channel different from said wireless channel. A method for controlling a mobile station in mobile communication, comprising: a step of comparing; and a step of switching a connection to a wireless channel having good quality as a result of the comparison.
【請求項3】 CDMA方式によって基地局と移動局と
の多元接続を行うとともに、前記基地局が前記移動局を
制御するための制御情報と前記移動局への通信情報とを
複数のスロットに分割した無線チャネルで送信する移動
通信であって、 前記制御情報と前記通信情報とを送信しないように予め
割り当てられた特定のスロットの期間に、前記無線チャ
ネルとは異なる無線チャネルを受信して、その信号品質
を検出する過程とを備えることを特徴とする移動通信に
おける信号品質検出方法。
3. A multiple access between a base station and a mobile station is performed by a CDMA system, and control information for the base station to control the mobile station and communication information to the mobile station are divided into a plurality of slots. Mobile communication to be transmitted on a wireless channel, wherein the control information and the communication information are not transmitted during a specific slot that is allocated in advance, receiving a wireless channel different from the wireless channel, A step of detecting signal quality.
【請求項4】 請求項3記載の移動通信における信号品
質検出方法において、さらに、 待受あるいは通信で使用している無線チャネルの信号品
質と、前記無線チャネルとは異なる無線チャネルの信号
品質とを比較する過程と、 比較の結果、品質の良好な無線チャネルに接続を切り換
える過程とを備えることを特徴とする移動通信における
移動局の制御方法。
4. The method for detecting signal quality in mobile communication according to claim 3, further comprising: determining a signal quality of a wireless channel used for standby or communication and a signal quality of a wireless channel different from the wireless channel. A method for controlling a mobile station in mobile communication, comprising: a step of comparing; and a step of switching a connection to a wireless channel having good quality as a result of the comparison.
JP09735798A 1998-04-09 1998-04-09 Method for detecting signal quality in mobile communication and method for controlling mobile station Expired - Lifetime JP3830068B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP09735798A JP3830068B2 (en) 1998-04-09 1998-04-09 Method for detecting signal quality in mobile communication and method for controlling mobile station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP09735798A JP3830068B2 (en) 1998-04-09 1998-04-09 Method for detecting signal quality in mobile communication and method for controlling mobile station

Publications (2)

Publication Number Publication Date
JPH11298398A true JPH11298398A (en) 1999-10-29
JP3830068B2 JP3830068B2 (en) 2006-10-04

Family

ID=14190255

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Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG114476A1 (en) * 1999-11-04 2005-09-28 Ntt Docomo Inc Method, base station and mobile station for timeslot selection and timeslot assignment
JP2007533254A (en) * 2004-04-15 2007-11-15 クゥアルコム・フラリオン・テクノロジーズ、インコーポレイテッド Method and apparatus for selecting between multiple carriers using a receiver with multiple receiver chains
US9118358B2 (en) 2004-04-15 2015-08-25 Qualcomm Incorporated Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG114476A1 (en) * 1999-11-04 2005-09-28 Ntt Docomo Inc Method, base station and mobile station for timeslot selection and timeslot assignment
US7620021B1 (en) 1999-11-04 2009-11-17 Ntt Docomo, Inc. Method, base station and mobile station for timeslot selection and timeslot assignment
JP2007533254A (en) * 2004-04-15 2007-11-15 クゥアルコム・フラリオン・テクノロジーズ、インコーポレイテッド Method and apparatus for selecting between multiple carriers using a receiver with multiple receiver chains
US9118358B2 (en) 2004-04-15 2015-08-25 Qualcomm Incorporated Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier

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