JPH05244075A - Radio zone selection system for mobile communication system - Google Patents
Radio zone selection system for mobile communication systemInfo
- Publication number
- JPH05244075A JPH05244075A JP4041237A JP4123792A JPH05244075A JP H05244075 A JPH05244075 A JP H05244075A JP 4041237 A JP4041237 A JP 4041237A JP 4123792 A JP4123792 A JP 4123792A JP H05244075 A JPH05244075 A JP H05244075A
- Authority
- JP
- Japan
- Prior art keywords
- radio base
- base station
- stations
- mobile
- wireless
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、移動通信システムにお
ける無線ゾーン選択方式に関する。自動車電話システム
等に見られるような無線通信システムの分野において
は、複数の無線ゾーンで構成されるサービスエリアを有
するが、この場合、これらの無線ゾーンの中からアクセ
スする無線ゾーンを選択する必要性がある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless zone selection system in a mobile communication system. In the field of wireless communication systems such as those found in car telephone systems, there is a service area consisting of multiple wireless zones. In this case, it is necessary to select the wireless zone to be accessed from these wireless zones. There is.
【０００２】[0002]
【従来の技術】従来の移動通信システムにおける無線ゾ
ーン選択方式においては、発呼あるいはハンドオーバー
の際における各移動局に対する基地局の割当ては、交換
機や回路制御局等のシステム側で行なうようになってい
る。この場合、基地局の増設や無線ゾーンのセクター化
等による変更等の際に、改めて最適な基地局割当て制御
を考慮する必要がある。このため、各移動局は、基地局
選択に関与するようになっており、各移動局に対する基
地局の割当て等のシステムの変更が柔軟に対処できるよ
うになっている。2. Description of the Related Art In a conventional radio zone selection method in a mobile communication system, a base station is assigned to each mobile station when a call is made or a handover is performed by a system such as an exchange or a circuit control station. ing. In this case, it is necessary to consider again the optimum base station allocation control when changing base stations or changing wireless zones to sectors. Therefore, each mobile station is involved in the selection of the base station, and it is possible to flexibly deal with the system change such as the allocation of the base station to each mobile station.
【０００３】そして、発呼あるいはハンドオーバーに際
して、このような移動局から基地局へアクセスするに
は、以下の２つの方式がある。まずは、交換機の指示に
基づき、移動局が、周辺の基地局の信号レベルを測定し
て、最大の受信レベルの基地局を交換機に報告し、その
基地局にアクセスする方式である（この方式を第１の従
来方式という）。There are the following two methods for accessing the base station from such a mobile station when making a call or performing a handover. First, based on instructions from the exchange, the mobile station measures the signal levels of neighboring base stations, reports the base station with the highest reception level to the exchange, and accesses that base station. The first conventional method).
【０００４】つぎは、基地局が、特定のチャネルを介し
て自局における通信用無線チャネルの使用可能／不可の
状態を移動局へ報知し、そして、これを受信した移動局
は、受信レベルが基準値以上得られ、且つ、通信用無線
チャネルが使用可能な無線ゾーンの基地局を選択する方
式である（この方式を第２の従来方式という）。Next, the base station notifies the mobile station of the enabled / disabled state of the communication radio channel in the local station through a specific channel, and the mobile station which receives this informs the reception level. This is a method of selecting a base station in a wireless zone which is obtained at or above a reference value and in which a wireless communication channel can be used (this method is called a second conventional method).
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の移動通信システムにおける無線ゾーン選択方
式では、移動局が無線基地局へアクセスする場合、上記
の第１の従来方式によると、信号品質が通信品質を保証
できるような基準値以上であるかの考慮はなされる。し
かし、アクセスする無線基地局が使用可能な通信用の無
線チャネルを有しているかどうかの点は考えられていな
い。However, in the radio zone selection method in such a conventional mobile communication system, when the mobile station accesses the radio base station, according to the first conventional method, the signal quality is improved. Consideration is made as to whether the value is equal to or higher than the reference value that can guarantee the communication quality. However, it is not considered whether or not the wireless base station to be accessed has an available wireless channel for communication.
【０００６】また、上記の第２の従来方式を用いて、移
動局が無線基地局へアクセスする場合は、無線基地局の
信号レベルが基準値以上かどうか、そして、アクセスす
る無線基地局が使用可能な通信用の無線チャネルを有し
ているかどうかの考慮がなされる。しかし、各無線無線
基地局が使用可能な通信用無線チャネル数に関する情報
は報知しておらず、単に使用可能の有無のみを報知して
いるだけである。Further, when the mobile station accesses the radio base station by using the above-mentioned second conventional method, whether the signal level of the radio base station is equal to or higher than a reference value, and the radio base station to be used Consideration is given as to whether it has a radio channel for possible communication. However, information regarding the number of communication wireless channels that can be used by each wireless wireless base station is not reported, and only the presence or absence of availability is reported.
【０００７】従って、例えば、複数の移動局が使用可能
な通信用無線チャネルを１チャネルしか持たない無線基
地局を選択することも考えられ、この場合は、１局の移
動局を省いてはチャネルが割当てられないことが起こり
うるという課題がある。そこで、基地局で使用可能な無
線チャネル数をＣi として、例えば ｍａｘ（Ｃi ），ｉ＝１〜Ｎ ・・・（１） を満たす無線基地局１−１〜１−Ｎを選択するというア
ルゴリズムを採用することも考えられるが、この場合
は、多数の移動局が同じ基地局を選択をするおそれかあ
るため、このようになると、その選択された特定の無線
基地局の負荷が大きくなり、さらに、移動局同士の制御
チャネルにおける衝突や、移動局の数が無線基地局の無
線チャネル数を越えると、呼損や強制終了が行なれるこ
とがあるという課題がある。Therefore, for example, it is conceivable to select a radio base station having only one communication radio channel that can be used by a plurality of mobile stations. In this case, one mobile station is omitted and the channel is omitted. However, there is a problem that it may happen that no allocation is made. Therefore, it is said that the radio base stations 1-1 to 1-N satisfying, for example, max (C i ), i = 1 to N (1) are selected, where C i is the number of radio channels available in the base station. It is possible to adopt an algorithm, but in this case, because there is a possibility that many mobile stations will select the same base station, this will increase the load on the specific radio base station selected. Further, there is a problem that a call loss or forced termination may occur when the control channels of mobile stations collide with each other or the number of mobile stations exceeds the number of radio channels of the radio base station.
【０００８】本発明は、このような課題に鑑み創案され
たもので、基準値以上の受信レベルが得られるかどうか
と、そして、アクセスする無線基地局での使用可能な通
信用無線チャネル数がどのくらいあるかという両点を考
慮して、１つの無線基地局への集中や他の移動局との衝
突を回避できるようにした、移動通信システムにおける
無線ゾーン選択方式を提供することを目的とする。The present invention has been made in view of the above problems, and determines whether a reception level higher than a reference value can be obtained, and the number of communication wireless channels available in a wireless base station to access. It is an object of the present invention to provide a radio zone selection method in a mobile communication system, which can avoid concentration in one radio base station and collision with other mobile stations in consideration of both of how many of them exist. ..
【０００９】[0009]
【課題を解決するための手段】図１は本発明の原理ブロ
ック図で、この図１において、１−１〜１−Ｎは無線基
地局、２−１〜２−Ｍ（２′−１〜２′−Ｍ）は移動局
で、これらの無線基地局１−１〜１−Ｎ，移動局２−１
〜２−Ｍ（２′−１〜２′−Ｍ）で移動通信システムを
構成している。FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, 1-1 to 1-N are radio base stations and 2-1 to 2-M (2'-1 to 1). 2'-M) is a mobile station, and these radio base stations 1-1 to 1-N, mobile station 2-1.
.About.2-M (2'-1 to 2'-M) constitute a mobile communication system.
【００１０】ここで、各無線基地局１−１〜１−Ｎは、
自局の使用可能な無線チャネル数情報Ｃi （ｉ＝１〜
Ｎ：１〜Ｎは、それぞれ無線基地局１−１〜１−Ｎに対
応したものである。尚、Ｎは自然数である。）を放送す
るものであり、各移動局２−１〜２−Ｍ（２′−１〜
２′−Ｍ）は、無線基地局１−１〜１−Ｎからの信号を
受信するもので、信号レベル検出器３（３）と無線基地
局選択部４（４′）とをそなえている。Here, each of the radio base stations 1-1 to 1-N is
Information on the number of usable wireless channels of the local station C i (i = 1 to 1
N: 1 to N correspond to the radio base stations 1-1 to 1-N, respectively. Note that N is a natural number. ) Is broadcasted by each mobile station 2-1 to 2-M (2'-1 to
2'-M) receives signals from the radio base stations 1-1 to 1-N, and includes a signal level detector 3 (3) and a radio base station selector 4 (4 '). ..
【００１１】ここで、信号レベル検出器３は、移動局２
−１〜２−Ｍの発呼時または通話時にハンドオーバーの
必要性を判断したときに、信号レベルを測定し、受信レ
ベルＬi が基準値以上であるかを検出するものである。
また、無線基地局選択部４は、信号レベル検出器３によ
って検出された、受信レベルＬi が基準値以上のアクセ
ス可能な無線基地局１−１〜１−Ｎの中から、使用可能
な無線チャネル数Ｃi に基づいて、１つの無線基地局１
−１〜１−Ｎへの集中や他の移動局２−１〜２−Ｍとの
衝突を回避すべく、所要の無線基地局１−１〜１−Ｎを
選択し、この無線基地局１−１〜１−Ｎに対してアクセ
スするものである。Here, the signal level detector 3 is the mobile station 2
When the necessity of handover is determined at the time of calling or calling of -1 to 2-M, the signal level is measured to detect whether the reception level L i is equal to or higher than the reference value.
In addition, the wireless base station selection unit 4 selects a usable wireless base station from among the accessible wireless base stations 1-1 to 1-N whose reception level L i detected by the signal level detector 3 is equal to or higher than a reference value. One radio base station 1 based on the number of channels C i
In order to avoid concentration to -1 to 1-N and collision with other mobile stations 2-1 to 2-M, the required wireless base stations 1-1 to 1-N are selected and this wireless base station 1 -1 to 1-N are accessed.
【００１２】さらに、無線基地局選択部４′は、信号レ
ベル検出器３によって検出された、受信レベルＬi が基
準値以上のアクセス可能な無線基地局１−１〜１−Ｎの
中から、受信レベルＬi による重み付けを施された使用
可能な無線チャネル数Ｃi に基づいて、１つの無線基地
局１−１〜１−Ｎへの集中や他の移動局２−１〜２−Ｍ
との衝突を回避すべく、所要の無線基地局１−１〜１−
Ｎを選択し、この無線基地局１−１〜１−Ｎに対してア
クセスするものである。Further, the radio base station selection unit 4'selects from the accessible radio base stations 1-1 to 1-N whose reception level L i detected by the signal level detector 3 is equal to or higher than a reference value, Based on the number C i of available wireless channels weighted by the reception level L i , concentration in one wireless base station 1-1 to 1-N and other mobile stations 2-1 to 2-M
Required radio base stations 1-1 to 1-
N is selected to access the radio base stations 1-1 to 1-N.
【００１３】[0013]
【作用】上述の本発明の移動通信システムにおける無線
ゾーン選択方式では、図１に示すように、各無線基地局
１−１〜１−Ｎは、自局の使用可能な無線チャネル数情
報Ｃi を放送する。そして、移動局２−１〜２−Ｍは、
発呼時または通話時にハンドオーバーの必要性を判断し
たときに、無線基地局１−１〜１−Ｎからの信号を受信
して、その信号レベルを測定する。そののち、移動局２
−１〜２−Ｍは、受信レベルＬi が基準値以上のアクセ
ス可能な無線基地局１−１〜１−Ｎの中から、使用可能
な無線チャネル数Ｃi に基づいて、１つの無線基地局１
−１〜１−Ｎへの集中や他の移動局２−１〜２−Ｍとの
衝突を回避すべく、所要の無線基地局１−１〜１−Ｎを
選択し、この無線基地局１−１〜１−Ｎに対してアクセ
スする（請求項１，３，４）。In the radio zone selection method in the mobile communication system of the present invention described above, as shown in FIG. 1, each radio base station 1-1 to 1-N has information C i on the number of radio channels available to itself. To broadcast. Then, the mobile stations 2-1 to 2-M
When the necessity of handover is determined at the time of calling or during a call, the signals from the radio base stations 1-1 to 1-N are received and the signal level thereof is measured. After that, mobile station 2
-1 to 2-M are one wireless base station based on the number of usable wireless channels C i from the accessible wireless base stations 1-1 to 1-N whose reception level L i is equal to or higher than a reference value. Station 1
In order to avoid concentration to -1 to 1-N and collision with other mobile stations 2-1 to 2-M, the required wireless base stations 1-1 to 1-N are selected and this wireless base station 1 Access to -1 to 1-N (claims 1, 3, 4).
【００１４】また、移動局２−１〜２−Ｍの代わりに、
移動局２′−１〜２′−Ｍが使用される場合は、この移
動局２′−１〜２′−Ｍは、発呼時または通話時にハン
ドオーバーの必要性を判断したときに、無線基地局１−
１〜１−Ｎからの信号を受信して、その信号レベルＬi
を測定したのちに以下の動作を行なう。すなわち、移動
局２′−１〜２′−Ｍは、受信レベルＬi が基準値以上
のアクセス可能な無線基地局１−１〜１−Ｎの中から、
受信レベルＬi による重み付けを施された使用可能な無
線チャネル数Ｃi に基づいて、１つの無線基地局１−１
〜１−Ｎへの集中や他の移動局２′−１〜２′−Ｍとの
衝突を回避すべく、所要の無線基地局１−１〜１−Ｎを
選択し、この無線基地局１−１〜１−Ｎに対してアクセ
スするのである（請求項２，３，４）。Further, instead of the mobile stations 2-1 to 2-M,
When the mobile stations 2'-1 to 2'-M are used, the mobile stations 2'-1 to 2'-M are wireless when the necessity of handover is determined at the time of calling or during a call. Base station 1-
The signals from 1 to 1-N are received and their signal levels L i
After measuring, perform the following operations. That is, the mobile station 2'-1~2'-M, from the reception level L i access is equal to or larger than the reference value can be a radio base station 1-1 to 1-N,
One radio base station 1-1 based on the number C i of available radio channels weighted by the reception level L i
.. 1-N and the collision with other mobile stations 2'-1 to 2'-M are selected, the required radio base stations 1-1 to 1-N are selected and the radio base station 1 -1 to 1-N are accessed (claims 2, 3 and 4).
【００１５】[0015]
【実施例】以下、図面を参照して本発明の実施例を説明
する。 （ａ）第１実施例の説明 図２は本発明の第１実施例を示すブロック図で、この図
２において、１−１〜１−Ｎは無線基地局、２−１〜２
−Ｍは移動局で、これらの無線基地局１−１〜１−Ｎ，
移動局２−１〜２−Ｍで移動通信システムを構成してい
る。Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment FIG. 2 is a block diagram showing a first embodiment of the present invention. In FIG. 2, 1-1 to 1-N are radio base stations, and 2-1 to 2-1.
-M is a mobile station, and these radio base stations 1-1 to 1-N,
The mobile stations 2-1 to 2-M make up a mobile communication system.
【００１６】ここで、各無線基地局１−１〜１−Ｎは、
自局の使用可能な無線チャネル数情報Ｃi を放送するも
のであり、各移動局２−１〜２−Ｍは、無線基地局１−
１〜１−Ｎからの信号を受信するもので、図２，図３に
示すように、信号レベル検出器３，無線基地局選択部
４，受信機５，アンテナ１０をそなえている。ここで、
信号レベル検出器３は、発呼時または通話時にハンドオ
ーバーの必要性を判断したときに、アンテナ１０より受
信した信号から、その信号レベルを測定し、受信レベル
Ｌi が基準値以上のもののそのレベル情報を無線基地局
選択部４のメモリ６へと出力するものである。Here, each of the radio base stations 1-1 to 1-N is
It broadcasts information C i on the number of available wireless channels of its own station, and each of the mobile stations 2-1 to 2-M has a wireless base station 1-.
It receives signals from 1 to 1-N and includes a signal level detector 3, a radio base station selector 4, a receiver 5 and an antenna 10, as shown in FIGS. here,
The signal level detector 3 measures the signal level of the signal received from the antenna 10 when the necessity of handover is determined at the time of calling or during a call, and if the reception level L i is equal to or higher than the reference value, The level information is output to the memory 6 of the radio base station selection unit 4.
【００１７】無線基地局選択部４は、信号レベル検出器
３によって検出された、受信レベルＬi が基準値以上の
アクセス可能な無線基地局１−１〜１−Ｎの中から、使
用可能な無線チャネル数Ｃi に基づいて、１つの無線基
地局１−１〜１−Ｎへの集中や他の移動局との衝突を回
避すべく、所要の無線基地局１−１〜１−Ｎを選択し、
この無線基地局１−１〜１−Ｎに対してアクセスするも
ので、このためにこの無線基地局選択部４は、メモリ
６，確率計算器７，無線基地局選択器８，乱数発生器９
をそなえて構成されている。The radio base station selector 4 can be used from the accessible radio base stations 1-1 to 1-N whose reception level L i detected by the signal level detector 3 is a reference value or more. Based on the number of radio channels C i , in order to avoid concentration in one radio base station 1-1 to 1-N and collision with another mobile station, the required radio base stations 1-1 to 1-N are selected. Selected,
The radio base station selection unit 4 accesses the radio base stations 1-1 to 1-N. For this purpose, the radio base station selection unit 4 includes a memory 6, a probability calculator 7, a radio base station selector 8, and a random number generator 9.
It is configured with.
【００１８】ここで、これら無線基地局選択部４にそな
えられた各部材の構成とともに、移動局２−１〜２−Ｍ
が複数のアクセス可能な無線基地局１−１〜１−Ｎの中
から、使用可能な無線チャネル数Ｃi と受信レベルＬi
に基づいて、アクセスする無線基地局１−１〜１−Ｎを
選択するためのアルゴリズムについての説明を行なう。Here, together with the configuration of each member provided in the radio base station selection unit 4, the mobile stations 2-1 to 2-M.
From the plurality of accessible wireless base stations 1-1 to 1-N, the number of available wireless channels C i and the reception level L i
The algorithm for selecting the radio base stations 1-1 to 1-N to be accessed will be described based on FIG.
【００１９】即ち、まず、メモリ６は、信号レベル検出
器３からの各移動局２−１〜２−Ｍの内の基準値以上を
保っている受信レベルＬi の無線基地局１−ｉの無線チ
ャネル数Ｃi を記録するものである。確率計算器７は、
メモリ６からの基準値以上の受信レベルＬi を持つ各無
線基地局１−１〜１−Ｎのそれぞれの無線チャネル数Ｃ
i を基にして、各無線基地局１−１〜１−Ｎを選択する
ためのそれぞれの確率ｐi を次式 ｐi ＝Ｃi ／〔Σ（ｊ＝１〜Ｎ）Ｃj 〕 ・・・ （２） によって、求めるものである。ここで、〔Σ（ｊ＝１〜
Ｎ）Ｃj 〕はＣ1 ＋Ｃ2＋・・・＋ＣN であることを意
味している。That is, first, the memory 6 stores the data of the radio base station 1-i having the reception level L i which is equal to or higher than the reference value among the mobile stations 2-1 to 2-M from the signal level detector 3. The number of wireless channels C i is recorded. The probability calculator 7
The number C of radio channels of each of the radio base stations 1-1 to 1-N having the reception level L i equal to or higher than the reference value from the memory 6
Based on i , the respective probabilities p i for selecting the respective radio base stations 1-1 to 1-N are given by the following formula p i = C i / [Σ (j = 1 to N) C j ]. -It is what is sought by (2). Here, [Σ (j = 1 to 1
N) C j ] means that C 1 + C 2 + ... + C N.
【００２０】乱数発生器９は、乱数の発生に自局の移動
局２−１〜２−ＭのＩＤ（識別番号）を用いることによ
り、移動局２−１〜２−Ｍ毎に異なる仕方で、（０，
１〕の一様乱数ｒを発生するものである。ここで、
（０，１〕は０よりも大きく１以下という意味である。
無線基地局選択器８は、確率計算器７で得られた確率ｐ
i から次式（３），（４）によって、得られるＰi を求
め、 Ｐi ＝Σ（ｊ＝１〜ｉ−１）ｐj ；ｉ＝２〜Ｎ ・・・ （３） Ｐi ＝０，ｉ＝１ ・・・ （４） このＰi を乱数発生器９で得られた一様乱数ｒと次式
（３）の関係を満たすようなものを選択することによ
り、 Ｐi ＜ｒ≦Ｐi ＋ｐi ・・・ （５） 使用可能なチャネルを多く持つ無線基地局１−１〜１−
Ｎから順に、高い確率で選択していき、その選択信号を
出力するものである。The random number generator 9 uses the IDs (identification numbers) of the mobile stations 2-1 to 2-M of its own station for the generation of random numbers, so that the mobile stations 2-1 to 2-M have different methods. , (0,
1] to generate a uniform random number r. here,
(0,1) means greater than 0 and less than or equal to 1.
The radio base station selector 8 uses the probability p obtained by the probability calculator 7.
i from the following equation (3), by (4), determine the resulting P i, P i = Σ ( j = 1~i-1) p j; i = 2~N ··· (3) P i = 0, i = 1 (4) This P i is selected so as to satisfy the relationship of the uniform random number r obtained by the random number generator 9 and the following expression (3), and P i <r ≦ P i + p i (5) Radio base stations 1-1 to 1-having many usable channels
The selection signal is output in order from N, with a high probability, and the selection signal is output.
【００２１】即ち、このようなアルゴリズムによって、
無線基地局選択部４内の各部材は、移動局２−１〜２−
Ｍが複数のアクセス可能な無線基地局１−１〜１−Ｎの
中から、使用可能な無線チャネル数Ｃi と受信レベルＬ
i に基づいて、アクセスする無線基地局１−１〜１−Ｎ
を選択するようになっているのである。尚、上記のアル
ゴリズムは、発呼時およびハンドオーバー時の両方に適
用することが可能なものである。That is, according to such an algorithm,
Each member in the radio base station selection unit 4 is a mobile station 2-1 to 2-
From the plurality of accessible wireless base stations 1-1 to 1-N, the number C i of available wireless channels and the reception level L
Based on i , the wireless base stations 1-1 to 1-N to be accessed
Is to be selected. The above algorithm can be applied both at the time of calling and at the time of handover.
【００２２】上述の構成により、図２に示すように、各
無線基地局１−１〜１−Ｎは、自局で使用可能な通信用
無線チャネルを数Ｃi を放送し、移動局２−１〜２−Ｍ
は、移動局２−１〜２−Ｍが発呼時または通話時にハン
ドオーバーの必要性を判断したときに、各無線基地局１
−１〜１−Ｎの放送信号を受信する。そして、図３に示
すように、移動局２−１〜２−Ｍによってキャッチされ
た、これらの無線基地局１−１〜１−Ｎよりの放送信号
は、この移動局２−１〜２−Ｍ内の各装置によって、以
下の処理を受ける。With the above configuration, as shown in FIG. 2, each of the radio base stations 1-1 to 1-N broadcasts a number C i of communication radio channels that can be used by itself, and the mobile station 2- 1-2-M
When the mobile stations 2-1 to 2-M judge the necessity of handover at the time of calling or during a call, each wireless base station 1
The broadcast signals of -1 to 1-N are received. Then, as shown in FIG. 3, the broadcast signals from the radio base stations 1-1 to 1-N, which are caught by the mobile stations 2-1 to 2-M, are transmitted to the mobile stations 2-1 to 2-. The following processing is performed by each device in M.
【００２３】即ち、受信機５を介して無線チャネル数Ｃ
i が無線基地局選択部４内のメモリ６へと送られるが、
これらの無線チャネル数Ｃi のうち受信レベルＬi が基
準値以上の基地局からの無線チャネル数情報がメモリ６
で記憶される。そして、確率計算器７によって、このメ
モリ６から、使用可能な受信レベルＬ i の各無線基地局
１−１〜１−Ｎの無線チャネル数Ｃi が読み出され、こ
れからアクセス可能な各無線基地局１−１〜１−Ｎを選
択するためのそれぞれの確率ｐ 1 〜ｐN が、上述の式
（２）により求められる。That is, the number of radio channels C is received via the receiver 5.
iIs sent to the memory 6 in the radio base station selection unit 4,
Number of these wireless channels CiOf the reception level LiBased on
Information on the number of wireless channels from the base station that is equal to or higher than the reference value is stored in the memory 6
Remembered in. Then, the probability calculator 7
Available reception level L from memory 6 iEach radio base station
Number of wireless channels 1-1 to 1-N CiIs read and
Select each wireless base station 1-1 to 1-N that can be accessed
Each probability p to choose 1~ PNIs the above formula
It is obtained by (2).
【００２４】また、乱数発生器９は、自局の移動局２−
１〜２−ＭのＩＤを用いて（０，１〕の一様乱数ｒを発
生させ、これらを無線基地局選択器８へと出力する。そ
して、確率計算器７からの確率ｐi と乱数発生器９から
の一様乱数ｒにより、無線基地局選択器８は、先の式
（３），（４）を用いてＰi を求め、さらに、一様乱数
ｒを先の式（５）に当てはめて、この式の関係が成立す
ることのできる特定の基地局を求める。この結果、使用
可能なチャネルを多く持つ無線基地局１−１〜１−Ｎか
ら順に高い確率で選択され、その局の選択信号が出力さ
れる。Further, the random number generator 9 is the mobile station 2-of its own station.
A uniform random number r of (0, 1) is generated using IDs 1 to 2-M, and these are output to the radio base station selector 8. Then, the probability p i from the probability calculator 7 and the random number are output. Using the uniform random number r from the generator 9, the radio base station selector 8 obtains P i using the above equations (3) and (4), and further calculates the uniform random number r from the above equation (5). Then, a specific base station for which the relation of this expression can be established is obtained, and as a result, the radio base stations 1-1 to 1-N having a large number of usable channels are selected with a high probability in order. The station selection signal is output.
【００２５】つまり、上述の要領で、独立に各無線基地
局１−１〜１−Ｎの使用可能な無線チャネル数Ｃi に基
づいて、１つの無線基地局への集中や他の移動局との衝
突を回避すべく、所要の無線基地局を選択し、この無線
基地局に対してアクセスするのである。このように、複
数の無線基地局１−１〜１−Ｎと複数の移動局２−１〜
２−Ｍとで構成される移動通信システムにおいて、各無
線基地局１−１〜１−Ｎが自局の使用可能な無線チャネ
ル数情報Ｃi を放送するとともに、移動局２−１〜２−
Ｍは、発呼時または通話時にハンドオーバーの必要性を
判断したときに、その信号レベルを測定し、受信レベル
Ｌi が基準値以上の無線基地局１−１〜１−Ｎの中か
ら、使用可能な無線チャネル数Ｃi に基づいて、所要の
無線基地局１−１〜１−Ｎを選択し、この無線基地局１
−１〜１−Ｎに対してアクセスすることにより、使用可
能な通信用無線チャネル数Ｃi の最大の基地局を常時選
択するのでは無く、使用可能なチャネルを多く持つ基地
局から高い確率で選択していくことができる。このた
め、各無線基地局１−１〜１−Ｎの持つ使用可能な無線
チャネル数Ｃi に応じて呼処理の負荷を分散することが
でき、特定のもの（例えば、使用可能な無線チャネル数
Ｃi が最大の局）への集中を防ぐことができる。That is, in the above-described manner, the concentration of one radio base station and the other mobile stations are independently performed based on the number C i of available radio channels of each radio base station 1-1 to 1-N independently. In order to avoid the collision of 1), the required radio base station is selected and the radio base station is accessed. Thus, the plurality of radio base stations 1-1 to 1-N and the plurality of mobile stations 2-1 to 2-1.
In the mobile communication system configured with 2-M, each of the radio base stations 1-1 to 1-N broadcasts information C i on the number of radio channels available for itself and the mobile stations 2-1 to 2-
When M determines the necessity of handover at the time of calling or during a call, the M measures its signal level, and from the radio base stations 1-1 to 1-N whose reception level L i is a reference value or more, The required radio base stations 1-1 to 1-N are selected based on the number of available radio channels C i , and the radio base station 1
By accessing -1 to 1-N, the base station having the largest number of usable communication wireless channels C i is not always selected, but the base station having many usable channels has a high probability. You can choose. Therefore, the load of call processing can be distributed according to the number C i of available wireless channels of each of the wireless base stations 1-1 to 1-N, and a specific one (for example, the number of available wireless channels can be used). It is possible to prevent concentration on the station having the largest C i ).
【００２６】また、移動局２−１〜２−Ｍが自立的に無
線基地局１−１〜１−Ｎを選択するアルゴリズムを持つ
ため、基地局の増設や無線ゾーンの変更に対して柔軟に
対処することができる。 （ｂ）第２実施例の説明 図４は本発明の第２実施例を示すブロック図で、この図
４において、１−１〜１−Ｎは無線基地局、２′−１〜
２′−Ｍは移動局で、これらの無線基地局１−１〜１−
Ｎ，移動局２′−１〜２′−Ｍで移動通信システムを構
成している。Since the mobile stations 2-1 to 2-M have an algorithm for autonomously selecting the radio base stations 1-1 to 1-N, the mobile stations 2-1 to 2-M can flexibly respond to the addition of base stations or the change of radio zones. Can be dealt with. (B) Description of Second Embodiment FIG. 4 is a block diagram showing a second embodiment of the present invention. In FIG. 4, 1-1 to 1-N are radio base stations and 2'-1 to
2'-M is a mobile station, and these radio base stations 1-1 to 1-
A mobile communication system is composed of N and mobile stations 2'-1 to 2'-M.
【００２７】ここで、各無線基地局１−１〜１−Ｎは、
自局の使用可能な無線チャネル数情報Ｃi を放送するも
ので、前述の第１実施例のものと同じものである。ま
た、各移動局２′−１〜２′−Ｍは、受信レベルＬi の
重み付けが必要な場合に、前述の第１実施例の移動局２
−１〜２−Ｍの代わりに使用されるもので、図４，図５
に示すように、信号レベル検出器３，無線基地局選択部
４′，受信機５，アンテナ１０をそなえている。Here, each of the radio base stations 1-1 to 1-N is
It broadcasts the information C i on the number of usable wireless channels of its own station, which is the same as that of the first embodiment. Further, each mobile station 2'-1 to 2'-M has a mobile station 2 of the above-described first embodiment when the reception level L i needs to be weighted.
Used in place of -1 to 2-M.
As shown in FIG. 3, it has a signal level detector 3, a radio base station selection unit 4 ', a receiver 5 and an antenna 10.
【００２８】ここで、信号レベル検出器３，受信機５，
アンテナ１０については、前述の第１実施例のものと同
じであるので、その説明は省略する。無線基地局選択部
４′は、信号レベル検出器３によって検出された、受信
レベルＣi が基準値以上のアクセス可能な無線基地局１
−１〜１−Ｎの中から、受信レベルＣi による重み付け
を施された使用可能な無線チャネル数に基づいて、１つ
の無線基地局への集中や他の移動局との衝突を回避すべ
く、所要の無線基地局を選択し、この無線基地局に対し
てアクセスするものであり、このために、この無線基地
局選択部４′は、メモリ６′，確率計算器７′，無線基
地局選択器８′，乱数発生器９′によって構成されてい
る。Here, the signal level detector 3, the receiver 5,
Since the antenna 10 is the same as that of the first embodiment described above, its description is omitted. The radio base station selection unit 4 ′ is accessible by the radio base station 1 whose reception level C i detected by the signal level detector 3 is equal to or higher than a reference value.
To avoid concentration in one radio base station or collision with other mobile stations based on the number of available radio channels weighted by the reception level C i from among −1 to 1-N , A required radio base station is selected and the radio base station is accessed. For this reason, the radio base station selection unit 4'includes a memory 6 ', a probability calculator 7', and a radio base station. It is composed of a selector 8'and a random number generator 9 '.
【００２９】ここで、メモリ６′は、メモリ６ａとメモ
リ６ｂによって構成されており、まずメモリ６ａは、受
信機５よりの無線チャネル数Ｃi を記憶するものであ
り、メモリ６ｂは、信号レベル検出器３よりの各無線基
地局１−１〜１−Ｎのうち基準値以上ある受信レベルを
記憶するものである。確率計算器７′は、メモリ６ａか
らの基準値以上の受信レベルＬi を持つ各無線基地局１
−１〜１−Ｎのそれぞれの無線チャネル数Ｃi と、メモ
リ６ｂからの各無線基地局１−１〜１−Ｎの基準値以上
の受信レベルＬi とを基にして、各無線基地局１−１〜
１−Ｎを選択するためのそれぞれの確率ｐi を次式 ｐ′i ＝Ｌi ・Ｃi ／〔Σ（ｊ＝１〜Ｎ）Ｌj ・Ｃj 〕 ・・・ （６） によって、求めるものである。Here, the memory 6'is composed of the memory 6a and the memory 6b. First, the memory 6a stores the number of radio channels C i from the receiver 5, and the memory 6b stores the signal level. The reception level of each of the radio base stations 1-1 to 1-N from the detector 3 which is equal to or higher than a reference value is stored. The probability calculator 7 ′ uses each radio base station 1 having a reception level L i from the memory 6 a which is equal to or higher than the reference value.
Based on the number of radio channels C i of −1 to 1-N and the reception level L i of the radio base stations 1-1 to 1-N that is equal to or higher than the reference value from the memory 6b, each radio base station 1-1 ~
The respective probabilities p i for selecting 1-N are calculated by the following equation p ′ i = L i · C i / [Σ (j = 1 to N) L j · C j ] ... (6) It is a thing.
【００３０】すなわち、確率計算器７′は、上述のアル
ゴリズムによって、各無線基地局１−１〜１−Ｎの無線
チャネル数Ｃi の他にその受信レベルＬi をも各無線基
地局１−１〜１−Ｎが選択される確率ｐ′1 〜ｐ′N に
反映させて、無線基地局１−１〜１−Ｎの選択に対して
の信頼性を高めるものである。乱数発生器９′は、先述
の乱数発生器９と同様に、乱数の発生に自局の移動局
２′−１〜２′−ＭのＩＤを用いることにより、移動局
２−１〜２−Ｍ毎に異なる仕方で（０，１〕の一様乱数
ｒ′を発生するものである。In other words, the probability calculator 7'uses the above-mentioned algorithm to determine not only the number of wireless channels C i of each wireless base station 1-1 to 1-N but also its reception level L i. 1 to 1-N is to reflect the probability p '1 ~p' N chosen are those which increase the reliability of the selected radio base station 1-1 to 1-N. Similar to the random number generator 9 described above, the random number generator 9'uses the IDs of the mobile stations 2'-1 to 2'-M of its own station to generate random numbers, so that the mobile stations 2-1 to 2- The uniform random number r ′ of (0, 1) is generated in a different manner for each M.
【００３１】無線基地局選択器８′は、確率計算器７′
で得られた確率ｐ′i から先述の無線基地局選択器８と
同様の要領で以下のＰ′i を求め〔次式（７），（８）
参照〕、 Ｐ′i ＝Σ（ｊ＝１〜ｉ−１）ｐ′j ；ｉ＝２〜Ｎ ・・・ （７） Ｐ′i ＝０，ｉ＝１ ・・・ （８） また、先述の無線基地局選択器８と同様の要領で、この
Ｐ′i を乱数発生器９′で得られた一様乱数ｒ′と次式
（９）の関係を満たすようなものを選択することによ
り、 Ｐ′i ＜ｒ≦Ｐ′i ＋ｐ′i ・・・ （９） 使用可能なチャネルを多く持つ無線基地局１−１〜１−
Ｎから順に、高い確率で選択していき、その選択信号を
出力するものである。The radio base station selector 8'includes a probability calculator 7 '.
The following P ′ i is obtained from the probability p ′ i obtained in the above in the same manner as the radio base station selector 8 described above [the following equations (7), (8)
, P ′ i = Σ (j = 1 to i−1) p ′ j ; i = 2 to N (7) P ′ i = 0, i = 1 (8) Further, In the same manner as the radio base station selector 8 of, the P ′ i is selected so as to satisfy the relationship of the uniform random number r ′ obtained by the random number generator 9 ′ and the following equation (9). , P ′ i <r ≦ P ′ i + p ′ i ... (9) Radio base stations 1-1 to 1-having many usable channels
The selection signal is output in order from N, with a high probability, and the selection signal is output.
【００３２】尚、この移動局２′−１〜２′−Ｍにおけ
るアルゴリズムも移動局２−１〜２−Ｍの場合と同様
に、発呼時およびハンドオーバー時の両方に適用するこ
とが可能なものである。このような構成により、図４に
示すように、各無線基地局１−１〜１−Ｎが自局の使用
可能な無線チャネル数情報を放送し、移動局２−１〜２
−Ｍでは、発呼時または通話時にハンドオーバーの必要
性を判断したときに、その放送信号を受信して、自身の
信号レベル検出器３によって信号レベルを測定する。The algorithm in the mobile stations 2'-1 to 2'-M can be applied both at the time of calling and at the time of handover as in the case of the mobile stations 2-1 to 2-M. It is something. With such a configuration, as shown in FIG. 4, each of the wireless base stations 1-1 to 1-N broadcasts information on the number of wireless channels available to the wireless base station 1-1 to the mobile stations 2-1 to 2-2.
In -M, when the necessity of handover is determined at the time of calling or during a call, the broadcast signal is received and the signal level detector 3 of its own measures the signal level.
【００３３】そののち、移動局２′−１〜２′−Ｍで
は、図５に示すように、受信機５を介して無線チャネル
数Ｃi が無線基地局選択部４′内のメモリ６ａに書き込
まれる。また、これとともに、信号レベル検出器３で基
準値以上で使用可能であると判断された受信レベルＬi
値がメモリ６ｂに書き込まれる。そして、確率計算器
７′によって、このメモリ６ａの使用可能な受信レベル
Ｌ i の各無線基地局１−１〜１−Ｎの無線チャネル数Ｃ
i が読み込まれ、また、それらの各無線基地局１−１〜
１−Ｎの受信レベルＬi もメモリ６ｂから読み込まれ
る。After that, the mobile stations 2'-1 to 2'-M
The radio channel through the receiver 5 as shown in FIG.
Number CiWrite to the memory 6a in the radio base station selection unit 4 '.
Get caught Along with this, the signal level detector 3
Reception level L judged to be usable above the quasi valuei
The value is written in the memory 6b. And the probability calculator
7'allowable reception level of this memory 6a
L iNumber of wireless channels C of each wireless base station 1-1 to 1-N
iAre also read, and their respective radio base stations 1-1 to 1-1
1-N reception level LiIs also read from memory 6b
It
【００３４】このように、複数の無線基地局１−１〜１
−Ｎと複数の移動局２′−１〜２′−Ｍとで構成される
移動通信システムにおいて、各無線基地局１−１〜１−
Ｎが自局の使用可能な無線チャネル数情報を放送すると
ともに、移動局２′−１〜２′−Ｍは、発呼時または通
話時にハンドオーバーの必要性を判断したときに、その
信号レベルを測定し、受信レベルが基準値以上の無線基
地局１−１〜１−Ｎの中から、受信レベルによる重み付
けを施された使用可能な無線チャネル数に基づいて、所
要の無線基地局１−１〜１−Ｎを選択し、この無線基地
局１−１〜１−Ｎに対してアクセスすることにより、使
用可能な通信用無線チャネル数Ｃi の最大の無線基地局
１−１〜１−Ｎを常に選択することなく、使用可能なチ
ャネルを多く持ちつつ、且つ、信号レベルの高いところ
から高い確率で選択することができる。この結果、各無
線基地局１−１〜１−Ｎの呼処理の負荷をそれぞれが持
つ、使用可能な無線チャネル数Ｃi に応じて分散できる
ので、特定の局等への負荷の集中を防ぐことができる。As described above, the plurality of radio base stations 1-1 to 1
-N and a plurality of mobile stations 2'-1 to 2'-M in a mobile communication system, each radio base station 1-1 to 1-
N broadcasts information about the number of wireless channels available for its own station, and the mobile stations 2'-1 to 2'-M determine the signal level when it determines the necessity of handover at the time of calling or during a call. Of the required radio base stations 1-N based on the number of usable radio channels weighted by the reception level from among the radio base stations 1-1 to 1-N whose reception level is equal to or higher than the reference value. By selecting 1 to 1-N and accessing these wireless base stations 1-1 to 1-N, the maximum wireless base stations 1-1 to 1- of the number of usable communication wireless channels C i are obtained. Without always selecting N, it is possible to select from a high signal level with a high probability while having many usable channels. As a result, the load of call processing of each of the radio base stations 1-1 to 1-N can be distributed according to the number of available radio channels C i , so that concentration of the load on a specific station or the like can be prevented. be able to.
【００３５】そしてまた、移動局２−１〜２−Ｍの場合
と同様に、移動局２′−１〜２′−Ｍが自立的に基地局
を選択するアルゴリズムを持つので、無線基地局１−１
〜１−Ｎの増設や無線ゾーンの変更に対して柔軟に対処
することができる。As in the case of the mobile stations 2-1 to 2-M, the mobile stations 2'-1 to 2'-M have an algorithm for autonomously selecting a base station. -1
It is possible to flexibly deal with the addition of 1 to N or the change of the wireless zone.
【００３６】[0036]
【発明の効果】以上詳述したように、本発明の移動通信
システムにおける無線ゾーン選択方式によれば、複数の
無線基地局と複数の移動局とで構成される移動通信シス
テムにおいて、各無線基地局が自局の使用可能な無線チ
ャネル数情報を放送するとともに、移動局は、発呼時ま
たは通話時にハンドオーバーの必要性を判断したとき
に、無線基地局からの信号を受信して、その信号レベル
を測定し、受信レベルが基準値以上のアクセス可能な無
線基地局の中から、使用可能な無線チャネル数に基づい
て、１つの無線基地局への集中や他の移動局との衝突を
回避すべく、所要の無線基地局を選択し、この無線基地
局に対してアクセスすることにより、各移動局は、基準
値以上の受信レベルのものの中から、それらの使用可能
な無線チャネル数を考慮することができ、この結果、特
定の無線基地局に負荷が集中することを回避できる利点
がある。また、無線基地局の増設や無線ゾーンの変更に
対する対処に柔軟性が持てる利点がある（請求項１，
３，４）。As described in detail above, according to the wireless zone selection method in the mobile communication system of the present invention, in the mobile communication system including a plurality of radio base stations and a plurality of mobile stations, each radio base While the station broadcasts information on the number of available wireless channels of its own station, the mobile station receives the signal from the wireless base station when it judges the necessity of handover when making a call or during a call, and The signal level is measured, and among the accessible wireless base stations whose reception level is equal to or higher than the reference value, concentration in one wireless base station or collision with another mobile station is determined based on the number of available wireless channels. In order to avoid this, by selecting a required radio base station and accessing this radio base station, each mobile station determines the number of available radio channels among those having a reception level higher than the reference value. It can be taken into, As a result, there is an advantage of avoiding that the load is concentrated on a specific radio base station. Further, there is an advantage that flexibility can be dealt with when the number of wireless base stations is increased or the wireless zone is changed (claim 1,
3, 4).
【００３７】また、本発明の移動通信システムにおける
無線ゾーン選択方式によれば、複数の無線基地局と複数
の移動局とで構成される移動通信システムにおいて、各
無線基地局が自局の使用可能な無線チャネル数情報を放
送するとともに、移動局は、発呼時または通話時にハン
ドオーバーの必要性を判断したときに、無線基地局から
の信号を受信して、その信号レベルを測定し、受信レベ
ルが基準値以上のアクセス可能な無線基地局の中から、
受信レベルによる重み付けを施された使用可能な無線チ
ャネル数に基づいて、１つの無線基地局への集中や他の
移動局との衝突を回避すべく、所要の無線基地局を選択
し、この無線基地局に対してアクセスすることにより、
各移動局は、基準値以上の受信レベルのものの中からそ
れらの各受信レベルの善し悪しを配慮しつつ、使用可能
な無線チャネル数を考慮することができ、この結果、特
定の無線基地局に負荷が集中することを回避できるとと
もに、より良い受信レベルの無線基地局の選択ができる
利点がある。また、無線基地局の増設や無線ゾーンの変
更の際の対処に柔軟性が持てる利点もある（請求項２，
３，４）。Further, according to the radio zone selection method in the mobile communication system of the present invention, each mobile base station can use its own station in the mobile communication system composed of a plurality of mobile base stations and a plurality of mobile stations. In addition to broadcasting information on the number of wireless channels, the mobile station receives the signal from the wireless base station when it determines the necessity of handover at the time of calling or during a call, measures the signal level, and receives the signal. From the accessible wireless base stations whose level is above the reference value,
Based on the number of available radio channels weighted by the reception level, a required radio base station is selected to avoid concentration in one radio base station and collision with other mobile stations, and this radio base station is selected. By accessing the base station,
Each mobile station can consider the number of available radio channels from among those with reception levels above the reference value, while considering the goodness of each reception level, and as a result, load on a particular radio base station. Is advantageously prevented, and a radio base station having a better reception level can be selected. In addition, there is also an advantage that there is flexibility in coping with the addition of a wireless base station or the change of a wireless zone (claim 2,
3, 4).
【図１】本発明の原理ブロック図である。FIG. 1 is a principle block diagram of the present invention.
【図２】本発明の第１実施例を示すブロック図である。FIG. 2 is a block diagram showing a first embodiment of the present invention.
【図３】本発明の第１実施例における移動局を示すブロ
ック図である。FIG. 3 is a block diagram showing a mobile station according to the first embodiment of the present invention.
【図４】本発明の第２実施例を示すブロック図である。FIG. 4 is a block diagram showing a second embodiment of the present invention.
【図５】本発明の第２実施例における移動局を示すブロ
ック図である。FIG. 5 is a block diagram showing a mobile station according to a second embodiment of the present invention.
１−１〜１−Ｎ 無線基地局 ２−１〜２−Ｍ，２′−１〜２′−Ｍ 移動局 ３ 信号レベル検出器 ４，４′ 無線基地局選択部 ５ 受信機 ６，６′，６ａ，６ｂ メモリ ７，７′ 確率計算器 ８，８′ 無線基地局選択器 ９，９′ 乱数発生器 １０ アンテナ 1-1 to 1-N Radio base station 2-1 to 2-M, 2'-1 to 2'-M Mobile station 3 Signal level detector 4, 4'Radio base station selector 5 Receiver 6, 6 ' , 6a, 6b Memory 7, 7'Probability calculator 8, 8'Radio base station selector 9, 9'Random number generator 10 Antenna
Claims (4)
は自然数）と複数の移動局（２−１〜２−Ｍ：Ｍは自然
数）とで構成される移動通信システムにおいて、 各無線基地局（１−１〜１−Ｎ）が自局の使用可能な無
線チャネル数情報を放送するとともに、 該移動局（２−１〜２−Ｍ）は該無線基地局（１−１〜
１−Ｎ）からの信号を受信して、その信号レベルを測定
し、受信レベルが基準値以上のアクセス可能な無線基地
局（１−１〜１−Ｎ）の中から、使用可能な無線チャネ
ル数に基づいて、１つの無線基地局（１−１〜１−Ｎ）
への集中や他の移動局（２−１〜２−Ｍ）との衝突を回
避すべく、所要の無線基地局（１−１〜１−Ｎ）を選択
し、この無線基地局（１−１〜１−Ｎ）に対してアクセ
スすることを特徴とする、移動通信システムにおける無
線ゾーン選択方式。1. A plurality of radio base stations (1-1 to 1-N: N)
Is a natural number) and a plurality of mobile stations (2-1 to 2-M: M is a natural number), each radio base station (1-1 to 1-N) can be used by itself. Information on the number of wireless channels, the mobile stations (2-1 to 2-M) transmit the wireless base stations (1-1 to
1-N), the signal level is measured, and the available radio channel is selected from the accessible radio base stations (1-1 to 1-N) whose reception level is equal to or higher than a reference value. One radio base station (1-1 to 1-N) based on the number
In order to avoid concentration to mobile stations and collision with other mobile stations (2-1 to 2-M), the required radio base stations (1-1 to 1-N) are selected, and the radio base stations (1- 1 to 1-N), a wireless zone selection method in a mobile communication system.
複数の移動局（２′−１〜２′−Ｍ）とで構成される移
動通信システムにおいて、 各無線基地局（１−１〜１−Ｎ）が自局の使用可能な無
線チャネル数情報を放送するとともに、 該移動局（２′−１〜２′−Ｍ）は該無線基地局（１−
１〜１−Ｎ）からの信号を受信して、その信号レベルを
測定し、受信レベルが基準値以上のアクセス可能な無線
基地局（１−１〜１−Ｎ）の中から、該受信レベルによ
る重み付けを施された使用可能な無線チャネル数に基づ
いて、１つの無線基地局（１−１〜１−Ｎ）への集中や
他の移動局（２′−１〜２′−Ｍ）との衝突を回避すべ
く、所要の無線基地局（１−１〜１−Ｎ）を選択し、こ
の無線基地局（１−１〜１−Ｎ）に対してアクセスする
ことを特徴とする、移動通信システムにおける無線ゾー
ン選択方式。2. In a mobile communication system comprising a plurality of radio base stations (1-1 to 1-N) and a plurality of mobile stations (2'-1 to 2'-M), each radio base station ( 1-1 to 1-N) broadcast information on the number of available wireless channels of its own station, and the mobile stations (2′-1 to 2′-M) of the wireless base station (1-
1 to 1-N), the signal level is measured, and the reception level is selected from the accessible radio base stations (1-1 to 1-N) having a reception level equal to or higher than a reference value. Based on the number of usable wireless channels weighted by, the concentration in one wireless base station (1-1 to 1-N) and the other mobile stations (2′-1 to 2′-M) In order to avoid the collision of the wireless base stations (1-1 to 1-N), the wireless base stations (1-1 to 1-N) are accessed to move. Wireless zone selection method in communication system.
（１−１〜１−Ｎ）からの信号レベルを測定して、所要
の無線基地局（１−１〜１−Ｎ）を選択することを特徴
とする、請求項１または請求項２に記載の移動通信シス
テムにおける無線ゾーン選択方式。3. The mobile station measures a signal level from the radio base stations (1-1 to 1-N) at the time of making a call to obtain a required radio base station (1-1 to 1-N). The wireless zone selection method in the mobile communication system according to claim 1 or 2, characterized in that.
必要性を判断したときに、該無線基地局（１−１〜１−
Ｎ）からの信号レベルを測定して、所要の無線基地局
（１−１〜１−Ｎ）を選択することを特徴とする、請求
項１または請求項２に記載の移動通信システムにおける
無線ゾーン選択方式。4. When the mobile station determines the necessity of handover during a call, the radio base station (1-1 to 1-
Radio zone in the mobile communication system according to claim 1 or 2, characterized in that a required radio base station (1-1 to 1-N) is selected by measuring a signal level from N). Selection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4041237A JPH05244075A (en) | 1992-02-27 | 1992-02-27 | Radio zone selection system for mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4041237A JPH05244075A (en) | 1992-02-27 | 1992-02-27 | Radio zone selection system for mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05244075A true JPH05244075A (en) | 1993-09-21 |
Family
ID=12602819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4041237A Withdrawn JPH05244075A (en) | 1992-02-27 | 1992-02-27 | Radio zone selection system for mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05244075A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007184946A (en) * | 1996-06-07 | 2007-07-19 | Qualcomm Inc | Method and apparatus for performing idle handoff in multiple access communication system |
| JP2009503912A (en) * | 2005-02-08 | 2009-01-29 | クゥアルコム・インコーポレイテッド | Method and apparatus for allocating resources in a multicast / broadcast system |
| WO2011148487A1 (en) * | 2010-05-27 | 2011-12-01 | 富士通株式会社 | Wireless communication system, base station, terminal, and wireless communication method |
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-
1992
- 1992-02-27 JP JP4041237A patent/JPH05244075A/en not_active Withdrawn
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|---|---|---|---|---|
| JP4694607B2 (en) * | 1996-06-07 | 2011-06-08 | クゥアルコム・インコーポレイテッド | Method and apparatus for performing idle handoff in a multiple access communication system |
| JP4598111B2 (en) * | 1996-06-07 | 2010-12-15 | クゥアルコム・インコーポレイテッド | Method and apparatus for performing idle handoff in a multiple access communication system |
| US7496073B2 (en) | 1996-06-07 | 2009-02-24 | Qualcomm Incorporated | Method and apparatus for performing idle handoff in a multiple access communication system |
| JP2009060625A (en) * | 1996-06-07 | 2009-03-19 | Qualcomm Inc | Method and apparatus for executing idle handoff in multiple access communication system |
| JP2007184946A (en) * | 1996-06-07 | 2007-07-19 | Qualcomm Inc | Method and apparatus for performing idle handoff in multiple access communication system |
| JP2010259102A (en) * | 1996-06-07 | 2010-11-11 | Qualcomm Inc | Method and apparatus for executing idle handoff in multiple access communication system |
| JP2009060626A (en) * | 1996-06-07 | 2009-03-19 | Qualcomm Inc | Method and apparatus for executing idle handoff in multiple access communication system |
| JP4598006B2 (en) * | 1996-06-07 | 2010-12-15 | クゥアルコム・インコーポレイテッド | Method and apparatus for performing idle handoff in a multiple access communication system |
| JP2009503912A (en) * | 2005-02-08 | 2009-01-29 | クゥアルコム・インコーポレイテッド | Method and apparatus for allocating resources in a multicast / broadcast system |
| US8942713B2 (en) | 2005-02-08 | 2015-01-27 | Qualcomm Incorporated | Method and apparatus for allocating resources in a multicast/broadcast communications system |
| US8340664B2 (en) | 2007-08-03 | 2012-12-25 | Qualcomm Incorporated | Cell reselection in a wireless communication system |
| WO2011148487A1 (en) * | 2010-05-27 | 2011-12-01 | 富士通株式会社 | Wireless communication system, base station, terminal, and wireless communication method |
| US8554227B2 (en) | 2010-05-27 | 2013-10-08 | Fujitsu Limited | Cell selection based on priority factors in overlapping cells using different frequencies |
| JP5423885B2 (en) * | 2010-05-27 | 2014-02-19 | 富士通株式会社 | Wireless communication system, base station, terminal, and wireless communication method |
| US8989742B2 (en) | 2011-06-17 | 2015-03-24 | Qualcomm Incorporated | Methods and apparatus for inter-rat cell reselection |
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