JP2921739B2 - Call admission control method and apparatus - Google Patents
Call admission control method and apparatusInfo
- Publication number
- JP2921739B2 JP2921739B2 JP7000759A JP75995A JP2921739B2 JP 2921739 B2 JP2921739 B2 JP 2921739B2 JP 7000759 A JP7000759 A JP 7000759A JP 75995 A JP75995 A JP 75995A JP 2921739 B2 JP2921739 B2 JP 2921739B2
- Authority
- JP
- Japan
- Prior art keywords
- call
- transmission power
- mobile station
- interference
- base station
- 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.)
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- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、無線基地局と移動局の
間で通信を行う移動通信システムにおける呼受付制御方
法および装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call admission control method and apparatus in a mobile communication system for performing communication between a radio base station and a mobile station.
【０００２】[0002]
【従来の技術】現在普及している、携帯電話や自動車電
話のような移動通信システムでは、サービスエリア全体
を、セルと呼ばれる比較的小さな無線ゾーンに分割して
サービスを行っている。このような方式はセルラ方式と
呼ばれ、例えば、ひとつのセルの半径は１〜２ｋｍ程度
に設定される。同一の無線チャネルを地理的に繰り返し
て再利用することでシステムの加入者容量を増大するこ
とができ、また、移動局から近距離に無線基地局が存在
する確率が高くなるので、携帯電話端末のように送信電
力が比較的小さな移動局でも良好な通信品質で通信を行
うことができるなどの利点がある。2. Description of the Related Art Mobile communication systems, such as mobile phones and car phones, which are now widely used, divide an entire service area into relatively small radio zones called cells to provide services. Such a system is called a cellular system. For example, the radius of one cell is set to about 1 to 2 km. By repeatedly reusing the same wireless channel geographically, the subscriber capacity of the system can be increased, and the probability that a wireless base station exists in a short distance from a mobile station increases. As described above, there is an advantage that even a mobile station having relatively small transmission power can perform communication with good communication quality.
【０００３】一般に、移動通信システムでは使用できる
無線資源が限られているために、システムに収容できる
加入者の容量には限界がある。したがって、この容量を
超えて通信要求が発生した場合には、サービスの提供を
拒否される、いわゆる呼損が発生する。[0003] Generally, in a mobile communication system, available radio resources are limited, so that the capacity of a subscriber that can be accommodated in the system is limited. Therefore, when a communication request is generated exceeding this capacity, service provision is rejected, that is, a so-called call loss occurs.
【０００４】従来の、無線チャネルを固定的に配置する
ＦＤＭＡ（Frequency Division Multiple Access）やＴ
ＤＭＡ(Time Division Multiple Access）のシステムで
は、同一チャネルからの干渉妨害や、無線チャネルの側
波帯のパワーの重なりを許容して無線チャネルを構成す
るインタリーブ方式における隣接無線チャネルからの干
渉妨害が発生する確率が十分低くなるように、各無線基
地局に配置する無線チャネルを決定する。その無線基地
局で同時に通信できる移動局数は、その無線基地局に配
置された無線チャネル数により制限され、無線チャネル
数を超えて通信の要求が発生した場合には、呼損とな
る。このようなシステムでは、チャネル数は各基地局に
固定的に割り当てられているため、トラヒックの偏在や
時間的変動に対して柔軟に対応することが困難であると
いう欠点がある。Conventional FDMA (Frequency Division Multiple Access) and T
In a DMA (Time Division Multiple Access) system, interference from the same channel and interference from an adjacent wireless channel in an interleaving scheme in which a wireless channel is configured by allowing overlapping of sideband powers of the wireless channel occur. The radio channel to be allocated to each radio base station is determined so that the probability of performing this operation is sufficiently low. The number of mobile stations that can communicate simultaneously with the radio base station is limited by the number of radio channels arranged in the radio base station. If a communication request exceeds the number of radio channels, a call loss occurs. In such a system, since the number of channels is fixedly assigned to each base station, there is a disadvantage that it is difficult to flexibly cope with uneven distribution of traffic and temporal fluctuation.
【０００５】また、無線チャネルを動的に割り当てる、
いわゆるダイナミックチャネル割当を用いるシステムで
は、無線チャネルの割当時に、所要の通信品質を満足す
る無線チャネルを選択して割り当てる方法が採られてい
た。例えば、干渉量が規定値以下の場合に割合可とする
方法や、ＣＩＲ(Carrier to Interference power Rati
o）が規定値以上の場合に割合可とする方法がある。こ
の場合には、各基地局に配置された送受信機がすべて使
用中のとき、あるいは、送受信機には空きがあるが所要
の通信品質を満たす無線チャネルが無い場合に呼損とな
る。[0005] Also, dynamically assigning radio channels,
In a system using so-called dynamic channel assignment, a method of selecting and assigning a wireless channel satisfying a required communication quality has been adopted when assigning a wireless channel. For example, when the amount of interference is equal to or less than a specified value, a ratio is allowed, or a carrier to interference power ratio
o) There is a method that allows ratio if the value is more than the specified value. In this case, a call loss occurs when all the transceivers arranged in each base station are in use, or when there is a free transceiver but no wireless channel that satisfies the required communication quality.
【０００６】一方、ＣＤＭＡ(Code Division Multiple
Access）は、異なる拡散コードを用いることにより、複
数のユーザが同一の無線周波数帯域を共有する方法であ
る。この方式では、無線チャネルは拡散コードにより構
成される。他の拡散コードを用いるユーザの通信波は干
渉となる。ＣＤＭＡシステムの容量は干渉量により制限
され、容量を超えて呼を接続した場合には、サービスエ
リア全体にわたって、同一の無線周波数帯域を使用して
いるユーザの通信品質が劣化する可能性がある。ひとつ
の拡散コードを用いる通信が他の拡散コードを用いる通
信に与える干渉量は、その拡散コード間の相互相関によ
り決まり、一般に、この相互相関値は十分小さな値とな
るように拡散コードの設計が行われる。On the other hand, CDMA (Code Division Multiple)
Access) is a method in which a plurality of users share the same radio frequency band by using different spreading codes. In this scheme, the radio channel is composed of a spreading code. A user's communication wave using another spreading code causes interference. The capacity of the CDMA system is limited by the amount of interference, and if a call is connected beyond the capacity, the communication quality of a user using the same radio frequency band may be deteriorated over the entire service area. The amount of interference that a communication using one spreading code gives to a communication using another spreading code is determined by the cross-correlation between the spreading codes. In general, the spreading code is designed so that the cross-correlation value is sufficiently small. Done.
【０００７】したがって、無線チャネルの割当てに際し
て、どの拡散コードを割り当てても、受ける干渉量は変
わらない。[0007] Therefore, when assigning a radio channel, the amount of interference received does not change regardless of which spreading code is assigned.
【０００８】また、移動通信システムでは、通信中に送
信電力を所要品質に見合う値に制御する、送信電力制御
が適用されることが多い。特にＣＤＭＡシステムにおい
ては、いわゆる遠近問題の回避のため、さらにシステム
容量の増大のための重要な技術である。この送信電力制
御の方法として、受信レベルを制御目標値に等しくす
る、受信レベル基準の送信電力制御と、ＣＩＮＲ(Carri
er to Interfere-plus-Noise power Ratio）を制御目標
値に等しくする、ＣＩＮＲ基準の送信電力制御とがあ
る。特にシステム容量の観点からは、ＣＩＮＲ基準の送
信電力制御が有効であることが示されている。[0008] In mobile communication systems, transmission power control for controlling transmission power to a value suitable for required quality during communication is often applied. Particularly in a CDMA system, this is an important technique for avoiding the so-called near-far problem and for further increasing the system capacity. As a method of this transmission power control, transmission power control based on a reception level for making the reception level equal to a control target value, and CINR (Carri
er to Interfere-plus-Noise power Ratio) is equal to the control target value. Particularly, from the viewpoint of the system capacity, it is shown that the transmission power control based on the CINR is effective.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、従来の
ダイナミックチャネル割当てのように、所要品質を満足
する無線チャネルを選択する方法を、ＣＤＭＡシステム
に適用した場合には、無線チャネルの選択自体が行えな
くなるという欠点がある。所要の品質を満たす拡散コー
ドが無い場合には、呼損となるので、ある程度、現在通
信中の呼の通信品質を維持することはできるが、ＣＩＮ
Ｒ基準の送信電力制御を行う場合、新たな呼の接続によ
り、周辺の無線基地局における干渉が増加し、周辺の無
線基地局においても送信電力を増加させるため、呼受付
後の干渉量は呼受付前の観測値よりも大きくなってしま
う。そのため、干渉確率が高くなり、強制切断率が高く
なってしまうという欠点がある。However, when a method for selecting a radio channel satisfying a required quality like a conventional dynamic channel assignment is applied to a CDMA system, the radio channel cannot be selected. There is a disadvantage that. If there is no spreading code that satisfies the required quality, a call loss occurs. Therefore, the communication quality of the currently communicating call can be maintained to some extent.
In the case of performing R-based transmission power control, a new call connection increases interference in nearby radio base stations and also increases transmission power in nearby radio base stations. It becomes larger than the observation value before reception. Therefore, there is a disadvantage that the interference probability increases and the forced disconnection rate increases.
【００１０】同様にＣＩＮＲ基準の送信電力制御を行
う、ＦＤＭＡあるいはＴＤＭＡシステムに、従来のダイ
ナミックチャネル割合のような、所要品質を満足する無
線チャネルを選択する方法を適用した場合にも、干渉確
率が高くなり、強制切断率が高くなってしまうという欠
点がある。Similarly, even when a method of selecting a radio channel satisfying required quality, such as a conventional dynamic channel ratio, is applied to an FDMA or TDMA system that performs transmission power control based on the CINR standard, the interference probability is low. However, there is a disadvantage that the forced cutting rate increases.
【００１１】また、ＣＤＭＡにおいてシステム容量を考
慮した呼受付制御方法として、無線基地局における受信
電力を基準として送信電力制御を行った場合の方法が提
案されている（Z.Liu and M.E.Zarki,"SIR-Based Call
Admission Control for DS-CDMA Cellular Systems,"IE
EE Journal on Selected Areas in Communications,Vo
l.12,No.4,pp.638-644,May 1994）。この方法は、無線
基地局における受信電力を基準として送信電力制御を行
った場合にはユーザ数が増えるに従って、通信中のＣＩ
ＮＲが低下することに着目して、新たな呼を受け付ける
ことによってＣＩＮＲが所要値を下回ると判断された場
合に呼の受付を拒否するものである。As a call admission control method in CDMA in consideration of system capacity, a method in which transmission power control is performed based on reception power at a radio base station has been proposed (Z. Liu and MEZarki, "SIR"). -Based Call
Admission Control for DS-CDMA Cellular Systems, "IE
EE Journal on Selected Areas in Communications, Vo
l. 12, No. 4, pp. 638-644, May 1994). In this method, when the transmission power control is performed based on the reception power at the radio base station, as the number of users increases, the CI during communication increases.
Paying attention to the decrease in NR, rejecting the call when it is determined that the CINR falls below a required value by accepting a new call.
【００１２】しかし、ＣＩＮＲを基準とした送信電力制
御を適用した場合において、簡単のため、送信電力制御
の誤差がない理想的な状況を考えると、通信中のユーザ
はすべて等しいＣＩＮＲで通信を行うよう制御されてい
る。したがって、通信中のユーザ数に関わらずＣＩＮＲ
が一定であるため、新たな呼を受け付けることにより、
ＣＩＮＲが劣化するかどうか判断できないため、強制切
断率の急激な増加あるいはシステム容量の低下を招くと
いう好ましくない欠点があった。However, in the case where transmission power control based on CINR is applied, considering the ideal situation in which there is no error in transmission power control for simplicity, all communicating users perform communication with the same CINR. It is controlled as follows. Therefore, regardless of the number of users in communication, CINR
Is constant, so by accepting a new call,
Since it cannot be determined whether or not the CINR deteriorates, there is an undesired disadvantage that a sudden increase in the forced disconnection rate or a decrease in the system capacity is caused.
【００１３】本発明は、上記課題に鑑みてなされたもの
で、強制切断等による通信品質の劣化を招来することな
く、さらに、トラヒックの偏在や時間的変動に対しても
柔軟に対応できかつシステム容量の大きな移動通信シス
テムを提供することのできる呼受付制御方法および装置
を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not cause deterioration of communication quality due to forced disconnection and the like, and can flexibly cope with uneven distribution of traffic and temporal fluctuation. An object of the present invention is to provide a call admission control method and apparatus capable of providing a mobile communication system having a large capacity.
【００１４】[0014]
【課題を解決するための手段】上記目的を達成するため
本願第１の発明は、複数の無線基地局と複数の移動局と
の間で無線チャネルを介して通信を行う移動通信システ
ムにおける呼受付制御方法であって、過去のデータに基
づいて予測される新たに呼を受け付けたときの干渉量を
参照して、新たに呼を受け付けたときの当該呼に対応す
る移動局および当該無線基地局に既に接続されている移
動局の通信品質を予測したときに、所定の通信品質を満
たせない移動局が存在することが予測された際には、こ
の新たな呼の受け付けを拒否することを要旨とする。According to a first aspect of the present invention, there is provided a mobile communication system in which a plurality of wireless base stations and a plurality of mobile stations communicate via a wireless channel. A control method, comprising: referring to an interference amount predicted based on past data when a new call is received; a mobile station and a radio base station corresponding to the call when a new call is received; When predicting the communication quality of a mobile station already connected to the network, when it is predicted that there is a mobile station that cannot satisfy the predetermined communication quality, it is necessary to reject the acceptance of this new call. And
【００１５】また、本願第２の発明は、複数の無線基地
局と複数の移動局との間で無線チャネルを介して通信を
行う移動通信システムにおける呼受付制御装置であっ
て、新たに呼を受け付けたときの干渉量を過去のデータ
に基づいて予測する第１の予測手段と、この第１の予測
手段で予測された干渉量を参照して、新たに呼を受け付
けたときの当該呼に対応する移動局および当該無線基地
局に既に接続されている移動局の通信品質を予測する第
２の予測手段と、この第２の予測手段で新たに呼を受け
付けたときに所定の通信品質を満たせない移動局が存在
することが予測されたときには、当該新たな呼の受け付
けを拒否する拒否手段とを有することを要旨とする。[0015] The second invention of the present application is a call admission control device in a mobile communication system in which communication is performed between a plurality of radio base stations and a plurality of mobile stations via a radio channel. A first predicting unit for predicting the interference amount at the time of reception based on past data, and referring to the interference amount predicted by the first predicting unit, the call at the time of newly receiving a call is Second predicting means for predicting the communication quality of a corresponding mobile station and a mobile station already connected to the radio base station; and a second communication means for determining a predetermined communication quality when a new call is accepted by the second predicting means. The gist is to have rejection means for rejecting the acceptance of the new call when it is predicted that there is a mobile station that cannot be satisfied.
【００１６】また、本願第３の発明は、複数の無線基地
局と複数の移動局との間で無線チャネルを介して通信を
行う移動通信システムにおける呼受付制御装置であっ
て、過去の干渉量に係るデータに基づき、自無線基地局
内からの干渉量と自無線基地局周辺の他の無線基地局か
らの干渉量との比を算出する第１の算出手段と、無線基
地局が同時に複数の移動局と接続するときの新たな呼受
付後の同時接続する移動局の数から、当該無線基地局内
からの干渉量を算出する第２の算出手段と、この第２の
算出手段の算出結果と前記第１の算出手段の算出結果に
基づいて、新たな呼受付後の周辺の他の無線基地局から
の干渉量を算出する第３の算出手段と、この第３の算出
手段で算出された干渉量により、当該新たな呼の受け付
けを拒否する拒否手段とを有することを要旨とする。The third invention of the present application is a call admission control device in a mobile communication system for performing communication via a radio channel between a plurality of radio base stations and a plurality of mobile stations, wherein First calculating means for calculating the ratio of the amount of interference from within the own wireless base station to the amount of interference from other wireless base stations around the own wireless base station, A second calculating means for calculating the amount of interference from within the radio base station from the number of simultaneously connected mobile stations after accepting a new call when connecting to the mobile station; and a calculation result of the second calculating means. A third calculating means for calculating an interference amount from another wireless base station after receiving a new call based on a calculation result of the first calculating means; and a third calculating means for calculating the interference amount. A rejection refusing to accept the new call due to the amount of interference And summarized in that a and.
【００１７】また、本願第４の発明は、前記拒否手段
は、前記基地局と接続される複数の移動局について、呼
受付後の各移動局の所要送信電力を算出し、この算出さ
れた所要送信電力が、受け付けようとする呼に対応する
移動局あるいは既に接続されている移動局の最大送信電
力を上回るときには所定の通信品質が満たされないと判
断して呼の受付を拒否することを要旨とする。In a fourth aspect of the present invention, the rejection means calculates, for a plurality of mobile stations connected to the base station, required transmission power of each mobile station after accepting a call, and calculates the calculated required transmission power. When the transmission power exceeds the maximum transmission power of the mobile station corresponding to the call to be accepted or the already connected mobile station, it is determined that the predetermined communication quality is not satisfied and the call is rejected. I do.
【００１８】さらに、本願第５の発明は、前記拒否手段
は、前記基地局と接続される複数の移動局に対する呼受
付後の所要送信電力を算出し、この算出された所要送信
電力が、受け付けようとする呼に対応する移動局あるい
は既に接続されている移動局に対して予め定められた最
大送信電力を上回るときには所定の通信品質が満たされ
ないと判断して呼の受付を拒否することを要旨とする。Further, in the fifth invention of the present application, the rejection means calculates required transmission power after a call is accepted for a plurality of mobile stations connected to the base station, and the calculated required transmission power is determined as an acceptable value. When the transmission power exceeds a predetermined maximum transmission power for a mobile station corresponding to a call to be made or a mobile station already connected, it is determined that predetermined communication quality is not satisfied and call acceptance is rejected. And
【００１９】[0019]
【作用】本願第１および第２の発明は、上記の目的を達
成するために、呼の受付後の干渉量を、過去の測定結果
に基づいて予測する手段と、受け付けようとする移動局
および既に当該無線基地局に接続されている移動局の通
信品質が、呼の受付後に所要値を満たすかどうかを判定
する手段とを備え、呼の受付後に所要の通信品質を満た
せない移動局が存在する場合に、呼の受付を拒否する。According to the first and second aspects of the present invention, in order to achieve the above object, a means for predicting an interference amount after a call is accepted based on past measurement results, a mobile station to be accepted, and Means for determining whether the communication quality of the mobile station already connected to the radio base station satisfies a required value after accepting the call, and there is a mobile station that cannot satisfy the required communication quality after accepting the call. If so, the call is rejected.
【００２０】本願第３の発明の呼受付制御装置は、過去
の干渉量の観測結果に基づき、自無線基地局内からの干
渉量と他の周辺の無線基地局からの干渉量の比を算出
し、また新たな呼受付後の自無線基地局内における同時
接続移動局数から、自無線基地局内からの干渉量を算出
し、さらにこれら干渉量の比と干渉量に基づいて算出さ
れる、呼受付後の周辺の他の無線基地局からの干渉量に
より、当該新たな呼の受け付けあるいは呼の受付拒否を
決定する。The call admission control device according to the third aspect of the present invention calculates the ratio of the amount of interference from within its own radio base station to the amount of interference from other neighboring radio base stations based on the past results of observation of the amount of interference. Further, the call reception is calculated based on the number of simultaneously connected mobile stations in the own radio base station after the new call reception, the interference amount from the own radio base station, and further calculated based on the ratio of these interference amounts and the interference amount. The reception of the new call or the rejection of the call is determined based on the amount of interference from other nearby wireless base stations.
【００２１】本願第４の発明の呼受付制御装置は、自無
線基地局内で通信中の移動局について、好ましくは各移
動局の最大送信電力と現在の送信電力および通信品質を
記録する手段を備え、呼の受付に際して、呼受付後の各
移動局の所要送信電力を算出し、受け付けようとする呼
あるいは、既に接続されている移動局のうち、上記算出
された所要送信電力が、該移動局の最大送信電力を上回
る場合に、所要品質が満たされないと判断して呼の受付
を拒否する。The call admission control device according to the fourth aspect of the present invention preferably includes means for recording the maximum transmission power of each mobile station, the current transmission power, and the communication quality of the mobile stations communicating within the own radio base station. When a call is accepted, the required transmission power of each mobile station after the call is accepted is calculated, and the required transmission power calculated among the calls to be accepted or the already connected mobile stations is calculated by the mobile station. If the maximum transmission power exceeds the maximum transmission power, it is determined that the required quality is not satisfied, and call acceptance is rejected.
【００２２】本願第５の発明の呼受付制御方法および装
置は、無線基地局が、自無線基地局と通信中の移動局に
対して送信する最大の電力を定め、呼の受付に際して、
呼受付後の各移動局に対する所要送信電力を算出し、受
け付けようとする呼あるいは、既に接続されている移動
局のうち、上記算出された所要送信電力が、予め定めら
れた最大送信電力を上回る場合に、所要品質が満たされ
ないと判断して呼の受付を拒否する。According to a fifth aspect of the present invention, there is provided a call admission control method and apparatus, wherein a radio base station determines the maximum power to be transmitted to a mobile station communicating with its own radio base station.
Calculate the required transmission power for each mobile station after accepting the call, and for the call to be accepted or among the already connected mobile stations, the calculated required transmission power exceeds a predetermined maximum transmission power. In this case, it is determined that the required quality is not satisfied, and the call is rejected.
【００２３】[0023]
【実施例】以下、本発明の呼受付制御方法が適用される
移動通信システムの一実施例を図面を参照して説明す
る。本発明は、ＣＩＮＲ基準の送信電力制御を行う、Ｃ
ＤＭＡ、ＦＤＭＡおよびＴＤＭＡシステムのいずれにお
いても同様に構成することができるので、本実施例では
ＣＤＭＡシステムを例にとって説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mobile communication system to which the call admission control method of the present invention is applied will be described below with reference to the drawings. The present invention provides CNR-based transmission power control.
Since the same configuration can be applied to any of the DMA, FDMA, and TDMA systems, the present embodiment will be described using a CDMA system as an example.
【００２４】図１は本発明に係る呼受付制御方法が適用
される移動通信システムの構成を示すブロック図であ
る。まず、第１の実施例として上りリンクの呼受付制御
方法について説明する。図１を参照するに、多数の無線
基地局１ａ、１ｂ、…、１ｎが適宜の間隔を有して配置
される。これら第１の基地局１ａ、第２の基地局１ｂ、
…、第ｎの基地局１ｎと、多数の無線基地局３ａ、３
ｂ、…、３ｋが適宜、無線チャネルを介して接続される
（但し、ｎ，ｋは任意の値とする、以下同様）。FIG. 1 is a block diagram showing the configuration of a mobile communication system to which the call admission control method according to the present invention is applied. First, an uplink call admission control method will be described as a first embodiment. Referring to FIG. 1, a large number of wireless base stations 1a, 1b,..., 1n are arranged at appropriate intervals. These first base station 1a, second base station 1b,
.., The n-th base station 1n and a large number of wireless base stations 3a, 3
b,..., 3k are appropriately connected via a wireless channel (however, n and k are arbitrary values, and so on).
【００２５】図２は、図１に示す移動通信システムに使
用される無線基地局１の構成、特に呼受付制御に関係す
る部分の構成を機能的に示すブロック図である。同図に
示す無線基地局１においては、Ｋi 個の送受信機１１
ａ，１１ｂ，…，１１Ｋi （但し、Ｋi は任意の値とす
る、以下同様）が送受信機制御装置１３に接続され、送
受信機制御装置１３は呼受付制御装置１５に接続されて
いる。また、呼受付制御装置１５は呼処理制御装置１７
およびメモリ１９に接続されている。FIG. 2 is a block diagram functionally showing a configuration of the radio base station 1 used in the mobile communication system shown in FIG. 1, particularly a configuration of a portion related to call admission control. In the radio base station 1 shown in the drawing, K i pieces of transceiver 11
a, 11b, ..., 11K i ( where, K i is an arbitrary value, the same applies hereinafter) is connected to the transceiver controller 13, the transceiver control unit 13 is connected to the call admission control device 15. Further, the call admission control device 15 is
And a memory 19.
【００２６】前記呼受付制御装置１５は、呼処理制御装
置１７からの要求に応じてメモリ１９上に格納されたデ
ータの読み出し、更新、書き込みを行い、かつその無線
基地局１で現在通信中の移動局３を管理する。送受信機
制御装置１３は送受信機１１ａ，１１ｂ，…，１１Ｋi
の管理を行い、また、呼受付制御装置１５の要求に応じ
て、各送受信機１１における通信品質の測定を行う。The call admission control device 15 reads, updates, and writes data stored in the memory 19 in response to a request from the call processing control device 17, and performs communication with the radio base station 1 The mobile station 3 is managed. The transceiver controller 13 transceiver 11a, 11b, ..., 11K i
The communication quality of each transceiver 11 is measured in response to a request from the call admission control device 15.
【００２７】図３にメモリ１９上に格納するデータの例
を概念的に示す。この図３に示す例では、メモリ１９上
には、現在、その無線基地局１と接続して通信を行って
いる移動局３に対応して、その移動局３の最大送信電
力、その移動局３の現在の送信電力、その移動局３に対
して割り当てられた無線基地局１の最大送信電力、その
移動局３に対する現在の無線基地局１の送信電力、上り
リンクの現在の受信電力、下りリンクの現在の受信電
力、上りリンクの干渉量、下りリンクの干渉量が記録さ
れている。FIG. 3 conceptually shows an example of data stored in the memory 19. In the example shown in FIG. 3, the maximum transmission power of the mobile station 3 and the mobile station 3 corresponding to the mobile station 3 currently connected to the radio base station 1 and performing communication are stored in the memory 19. 3, the current transmission power of the radio base station 1 assigned to the mobile station 3, the current transmission power of the radio base station 1 to the mobile station 3, the current reception power of the uplink, The current received power of the link, the amount of uplink interference, and the amount of downlink interference are recorded.
【００２８】図４は本実施例における呼受付制御の制御
手順を示すフローチャートである。新たな呼の生起、あ
るいはハンドオーバの要求等により、当該無線基地局に
呼接続要求があると、呼処理制御装置１７は呼受付制御
装置１５にその旨を通知する。呼受付制御装置１５は過
去の観測結果に基づいて、ステップＳ１１で呼を受け付
けた後のセル外干渉を予測する（第１の予測手段）。FIG. 4 is a flowchart showing a control procedure of the call admission control in this embodiment. When a call connection request is issued to the radio base station due to the occurrence of a new call or a request for handover, the call processing control device 17 notifies the call admission control device 15 of the request. The call admission control device 15 predicts out-of-cell interference after accepting the call in step S11 based on the past observation result (first prediction means).
【００２９】続いて、その予測値を用いて新たな呼およ
び既接続呼の呼受付後の所要送信電力を算出する（ステ
ップＳ１３）。新たな呼および既接続呼のすべてについ
て、算出された所要送信電力と最大送信電力を比較し
て、算出された所要送信電力が最大送信電力を超えてい
る移動局が存在する場合には、ステップＳ１９で新たな
呼の受付を拒否し（拒否手段）、超えている移動局が存
在しない場合には、新たな呼の受け付け処理を実行する
（ステップＳ２３）。呼受付後のセル外干渉の予測と所
要送信電力の算出手順については以下で詳細に説明す
る。Subsequently, the required transmission power after accepting the new call and the already connected call is calculated using the predicted value (step S13). Comparing the calculated required transmission power and the maximum transmission power for all of the new call and the already connected call, and if there is a mobile station whose calculated required transmission power exceeds the maximum transmission power, step In S19, acceptance of a new call is rejected (rejection means), and if there is no mobile station exceeding the rejection, a new call acceptance process is executed (step S23). The procedure for predicting out-of-cell interference after call acceptance and calculating required transmission power will be described in detail below.
【００３０】図５は、呼受付制御装置１５内の機能を示
すブロック図で、呼受付制御装置１５は、通信品質測定
制御部１５ａ、干渉量算出部１５ｂ、所要送信電力算出
部１５ｃ、メモリアクセス部１５ｄから構成される。FIG. 5 is a block diagram showing functions in the call admission control unit 15. The call admission control unit 15 includes a communication quality measurement control unit 15a, an interference amount calculation unit 15b, a required transmission power calculation unit 15c, and a memory access. It is composed of a part 15d.
【００３１】通信品質測定制御部１５ａは、接続中の各
移動局３の上りおよび下りリンクの通信品質測定を送受
信機制御装置１３に指令し、結果をメモリアクセス部１
５ｄを通じてメモリ１９に格納する。The communication quality measurement control unit 15a instructs the transceiver control unit 13 to measure the uplink and downlink communication quality of each connected mobile station 3, and sends the result to the memory access unit 1.
The data is stored in the memory 19 through 5d.
【００３２】ＤＳ／ＣＤＭＡ(Direct Sequence Code Di
vision Multiple Access）のシステムで、ＣＩＮＲを基
準とした送信電力制御が誤差や遅延無く行われている場
合、ひとつの無線基地局内のある時点における同時接続
数をＮ，ＣＩＮＲの制御目標値をＴCINR、処理利得をＰ
ｇ、熱雑音レベルをＮo 、無線基地局における受信レベ
ルをＲ、セル外からの干渉をＩとすると、DS / CDMA (Direct Sequence Code Di)
In a system of vision multiple access), when transmission power control based on CINR is performed without error or delay, the number of simultaneous connections in one radio base station at a certain point in time is N, and the control target value of CINR is T CINR And the processing gain is P
g, the thermal noise level N o, the reception level in the radio base station R, the interference from outside the cell and I,
【数１】 なる関係がある。上りリンクの場合、セル外からの干渉
は、全ユーザに共通であるから、ＣＩＮＲが等しくなる
ように移動局の送信電力を制御すると、無線基地局にお
ける受信レベルは等しくなる。一方、通信中の通信品質
測定では呼受付制御装置１５の通信品質測定制御部１５
ａは送受信機制御装置１３に品質監視を指令し、希望波
レベルと希望波以外の雑音（干渉と熱雑音の和、式
（１）の分母に等しい）を測定させる。通信品質測定制
御部１５ａは、希望波レベルＲと希望波以外の雑音レベ
ルＳの測定値を、干渉量算出部１５ｂに通知する。干渉
量算出部１５ｂは、第１の算出手段、第２の算出手段及
び第３の算出手段を有し、該測定結果を用いて、セル内
干渉Ｉinとセル外干渉Ｉを次のように算出する。(Equation 1) There is a relationship. In the case of the uplink, since interference from outside the cell is common to all users, if the transmission power of the mobile station is controlled so that the CINRs become equal, the reception levels at the radio base station become equal. On the other hand, in the communication quality measurement during communication, the communication quality measurement control unit 15 of the call admission control device 15
“a” instructs the transceiver controller 13 to monitor the quality, and causes the desired wave level and noise other than the desired wave (the sum of interference and thermal noise, which is equal to the denominator of equation (1)) to be measured. The communication quality measurement control unit 15a notifies the interference amount calculation unit 15b of the measured values of the desired wave level R and the noise level S other than the desired wave. The interference amount calculation unit 15b has a first calculation unit, a second calculation unit, and a third calculation unit, and uses the measurement results to calculate the intra-cell interference I in and the out-of-cell interference I as follows. calculate.
【００３３】Ｉin＝Ｒ（Ｎ−１）／Ｐｇ Ｉ＝Ｓ−Ｉin−Ｎo さらに、α＝Ｉ／Ｉinを算出し、メモリアクセス部１５
ｄを通じてメモリ１９に記録する。この動作は、呼受付
判断に際して行う方法や、一定時間間隔毎に実施する方
法等様々な方法が考えられるが、どのように構成しても
同様の効果が得られる。[0033] I in = R (N-1 ) / Pg I = S-I in -N o further calculates α = I / I in, the memory access unit 15
d is recorded in the memory 19. There are various methods for this operation, such as a method for making a call admission determination and a method for performing the operation at fixed time intervals. However, the same effect can be obtained regardless of the configuration.
【００３４】呼の接続要求に際して干渉量算出部１５ｂ
は、新たな呼を接続してもセル内干渉とセル外干渉の比
αは変わらないとして、呼受付後の干渉量を推定する。
すなわち、式（１）において、ユーザ数ＮをＮ′＝Ｎ＋
１で置き換えて、呼受付後も送信電力制御が可能である
と仮定すると、When a call connection request is made, an interference amount calculator 15b
Estimates the amount of interference after call acceptance, assuming that the ratio α of intra-cell interference and out-of-cell interference does not change even when a new call is connected.
That is, in equation (1), the number of users N is represented by N '= N +
Assuming that transmission power control is possible even after receiving a call by replacing with 1,
【数２】 なる関係がある。したがって、呼受付後の所要受信電力
Ｒ′は、式（２）をＲ′について解くことにより、(Equation 2) There is a relationship. Therefore, the required received power R 'after the call is accepted is obtained by solving the equation (2) for R'.
【数３】 と求められる。干渉量算出部１５ｂは得られた所要受信
電力Ｒ′を所要送信電力算出部１５ｃに通知する。(Equation 3) Is required. The interference amount calculation unit 15b notifies the required transmission power calculation unit 15c of the obtained required reception power R '.
【００３５】所要送信電力算出部１５ｃでは、メモリア
クセス部１５ｄを通じて、メモリ１９上に格納された各
移動局３の現在の送信電力と現在の受信電力を読み出
し、β＝Ｒ′／Ｒを算出し、さらに現在の送信電力をβ
倍する。その結果が、当該移動局３の最大送信電力を超
えていた場合に、呼受付拒否を呼受付制御装置１５に通
知して処理を終了する。新たな呼およびすべての既接続
呼について算出された所要送信電力が最大送信電力以下
であれば受付可と判断しその旨を呼処理制御装置１７に
通知し、同時に同時接続数を更新しメモリアクセス部１
５ｄを通じてメモリ１９上に新たな移動局３を登録す
る。The required transmission power calculation unit 15c reads out the current transmission power and the current reception power of each mobile station 3 stored in the memory 19 through the memory access unit 15d, and calculates β = R '/ R. , And the current transmit power is β
Multiply. If the result exceeds the maximum transmission power of the mobile station 3, the call acceptance rejection is notified to the call admission control device 15, and the process ends. If the required transmission power calculated for the new call and all the connected calls is equal to or less than the maximum transmission power, it is determined that the call can be accepted, and the fact is notified to the call processing control device 17, the number of simultaneous connections is updated, and memory access is performed Part 1
A new mobile station 3 is registered on the memory 19 through 5d.
【００３６】上記手順の中で、新たな呼の所要送信電力
を算出する際に、無線基地局１とその移動局３との間の
伝搬損失を知らなければならない。そのための方法とし
て、例えば、移動局３が待機中に送信電力一定で無線基
地局１から送信される制御用のチャネルの受信レベルを
測定し、接続要求が発生した時点で無線基地局１に通知
する方法や、呼接続要求が発生した時点で、無線基地局
１が送信電力を指定して移動局３に仮送信を行わせ、無
線基地局１において受信レベルを測定する方法等様々な
方法が考えられるが、どのように構成しても同様の効果
が得られる。In calculating the required transmission power for a new call in the above procedure, the propagation loss between the radio base station 1 and its mobile station 3 must be known. As a method for this, for example, the mobile station 3 measures the reception level of the control channel transmitted from the wireless base station 1 at a constant transmission power while waiting, and notifies the wireless base station 1 when a connection request occurs. And a method in which the radio base station 1 designates transmission power and causes the mobile station 3 to perform temporary transmission when a call connection request is generated, and the radio base station 1 measures a reception level. Although it is conceivable, a similar effect can be obtained regardless of the configuration.
【００３７】次に、第２の実施例として下りリンクの呼
受付制御方法について説明する。尚、この第２の実施例
として説明する下りリンクの呼受付制御方法は、実際に
は第１の実施例で述べた上りリンクの呼受付制御方法と
併せて行うように構成してもよい。Next, a downlink call admission control method will be described as a second embodiment. The downlink call admission control method described as the second embodiment may be configured to be actually performed in conjunction with the uplink call admission control method described in the first embodiment.
【００３８】まず、図１を参照するに、本発明の呼受付
制御方法が適用される移動通信システムでは、第１の実
施例と同様に、複数の無線基地局１ａ，１ｂ，…，１
ｎ、および無線チャネルを用いて無線基地局１と接続し
通信を行う複数の移動局３ａ，…，３ｋから構成され
る。First, referring to FIG. 1, in the mobile communication system to which the call admission control method of the present invention is applied, a plurality of radio base stations 1a, 1b,.
n, and a plurality of mobile stations 3a,..., 3k that communicate with the radio base station 1 by using a radio channel.
【００３９】図２は、図１に示す移動通信システムに使
用されている無線基地局１の構成、特に呼受付制御に関
係する部分の構成を機能的に示すブロック図である。同
図に示す無線基地局１においては、Ｋi 個の送受信機１
１ａ，１１ｂ，…，１１Ｋiが送受信機制御装置１３に
接続され、該送受信機制御装置１３は呼受付制御装置１
５に接続されている。また、呼受付制御装置１５は呼処
理制御装置１７およびメモリ１９に接続されている。FIG. 2 is a block diagram functionally showing a configuration of the radio base station 1 used in the mobile communication system shown in FIG. 1, particularly a configuration of a portion related to call admission control. In the radio base station 1 shown in the drawing, K i pieces of transceivers 1
, 11K i are connected to the transceiver control device 13, and the transceiver control device 13
5 is connected. The call admission control device 15 is connected to the call processing control device 17 and the memory 19.
【００４０】前記呼受付制御装置１５は、呼処理制御装
置１７からの要求に応じてメモリ１９上に格納されたデ
ータの読み出し、更新、書き込みを行い、かつその無線
基地局１で現在通信中の移動局３を管理する。送受信機
制御装置１３は送受信機１１ａ，１１ｂ，…，１１Ｋi
の管理を行い、また、呼受付制御装置１５の要求に応じ
て、各送受信機１１における通信品質の測定を行う。The call admission control device 15 reads, updates, and writes data stored in the memory 19 in response to a request from the call processing control device 17, and is currently communicating with the radio base station 1. The mobile station 3 is managed. The transceiver controller 13 transceiver 11a, 11b, ..., 11K i
The communication quality of each transceiver 11 is measured in response to a request from the call admission control device 15.
【００４１】図３にメモリ１９上に格納するデータの例
を概念的に示す。この例では、メモリ１９上には、現在
その無線基地局１と接続して通信を行っている移動局３
に対応して、その移動局３の最大送信電力、その移動局
３の現在の送信電力、その移動局３に対して割り当てら
れた無線基地局１の最大送信電力、その移動局３に対す
る現在の無線基地局１の送信電力、上りリンクの現在の
受信電力、下りリンクの現在の受信電力、上りリンクの
干渉量、下りリンクの干渉量が記録されている。FIG. 3 conceptually shows an example of data stored in the memory 19. In this example, the mobile station 3 which is currently connected to and communicates with the radio base station 1 is stored in the memory 19.
Corresponding to the maximum transmission power of the mobile station 3, the current transmission power of the mobile station 3, the maximum transmission power of the radio base station 1 assigned to the mobile station 3, the current transmission power of the mobile station 3, The transmission power of the radio base station 1, the current reception power of the uplink, the current reception power of the downlink, the amount of uplink interference, and the amount of downlink interference are recorded.
【００４２】図４は第２の実施例の呼受付制御の制御手
順を示すフローチャートである。新たな呼の生起、ある
いはハンドオーバの要求等により、当該無線基地局に呼
接続要求があると、呼処理制御装置１７は呼受付制御装
置１５にその旨を通知する。呼受付制御装置１５は過去
の観測結果に基づいて、呼を受け付けた後のセル外干渉
を予測する（ステップＳ１１）。続いて、その予測値を
用いて新たな呼および既接続呼の呼受付後の所要送信電
力を算出する（ステップＳ１３）。新たな呼および既接
続呼のすべてについて、算出された所要送信電力と最大
送信電力を比較して、算出された所要送信電力が最大送
信電力を超える移動局が存在する場合には、新たな呼の
受付を拒否し（ステップＳ１９）、最大送信電力を超え
る移動局が存在しない場合には、新たな呼の受け付け処
理を実行する（ステップＳ２３）。FIG. 4 is a flowchart showing a control procedure of the call admission control according to the second embodiment. When a call connection request is issued to the radio base station due to the occurrence of a new call or a request for handover, the call processing control device 17 notifies the call admission control device 15 of the request. The call admission control device 15 predicts out-of-cell interference after accepting the call based on the past observation result (step S11). Subsequently, the required transmission power after accepting the calls of the new call and the already-connected call is calculated using the predicted value (step S13). The calculated required transmission power is compared with the maximum transmission power for all of the new call and the already connected call. If there is a mobile station whose calculated required transmission power exceeds the maximum transmission power, the new call is determined. Is rejected (step S19), and if there is no mobile station exceeding the maximum transmission power, a new call acceptance process is executed (step S23).
【００４３】次に、呼受付後のセル外干渉の予測と所要
送信電力の算出手順について説明する。図５は、呼受付
制御装置１５内の機能を示すブロック図で、呼受付制御
装置１５は、通信品質測定制御部１５ａ、干渉量算出部
１５ｂ、所要送信電力算出部１５ｃ、メモリアクセス部
１５ｄから構成される。通信品質測定制御部１５ａは、
接続中の各移動局３の上りおよび下りリンクの通信品質
測定を送受信機制御装置１３に指令し、結果をメモリア
クセス部１５ｄを通じてメモリ１９に格納する。Next, a description will be given of a procedure for predicting out-of-cell interference after call acceptance and calculating required transmission power. FIG. 5 is a block diagram showing functions in the call admission control device 15. The call admission control device 15 includes a communication quality measurement control unit 15a, an interference amount calculation unit 15b, a required transmission power calculation unit 15c, and a memory access unit 15d. Be composed. The communication quality measurement control unit 15a
It instructs the transceiver controller 13 to measure the uplink and downlink communication quality of each connected mobile station 3 and stores the result in the memory 19 through the memory access unit 15d.
【００４４】ＤＳ／ＣＤＭＡ(Direct Sequence Code Di
vision Multiple Access）のシステムで、ＣＩＮＲを基
準とした送信電力制御が誤差や遅延無く行われている場
合、ひとつの無線基地局１内のある時点における同時接
続数をＮ、ＣＩＮＲの制御目標値をＴCINR、処理利得を
Ｐｇ、熱雑音レベルをＮo 、ｉ番目の移動局における受
信レベルおよびセル外からの干渉を、それぞれ、Ｒi ，
Ｉi すると、DS / CDMA (Direct Sequence Code Di)
In a system of vision multiple access), when transmission power control based on CINR is performed without error or delay, the number of simultaneous connections in one radio base station 1 at a certain point in time is N, and the control target value of CINR is N T CINR , processing gain Pg, thermal noise level N o , reception level at the i-th mobile station and interference from outside the cell are R i ,
I i
【数４】 なる関係がある。下りリンクでは、セル外干渉の状況が
移動局毎に異なっている点、およびＣＩＮＲが等しくな
るように送信電力制御を行った場合に希望波送信電力が
移動局３毎に異なっている点で上りリンクとは異なって
いる。(Equation 4) There is a relationship. In the downlink, the out-of-cell interference situation differs for each mobile station, and the desired signal transmission power differs for each mobile station 3 when the transmission power control is performed so that the CINR becomes equal. It is different from a link.
【００４５】一方、通信中の通信品質測定では呼受付制
御装置１５の通信品質測定制御部１５ａは送受信機制御
装置１３を通じて移動局３に品質監視測定を指令し、希
望波レベルＲi と希望波以外の雑音Ｓi （干渉と熱雑音
の和、式（４）の分母に等しい）を測定させる。移動局
３は、測定結果を無線基地局１に返送する。通信品質測
定制御部１５ａは返送結果を受け取り、干渉量算出部１
５ｂに通知する。干渉量算出部１５ｂでは、各移動局３
について該測定結果を用いて、セル内干渉Ｉinとセル外
干渉Ｉを次のように算出する。On the other hand, in the communication quality measurement during communication, the communication quality measurement control unit 15a of the call admission control device 15 instructs the mobile station 3 to perform quality monitoring measurement through the transceiver control device 13, and outputs the desired wave level R i and the desired wave. noise S i other than (the sum of the interference and thermal noise, is equal to the denominator of equation (4)) is measured. The mobile station 3 returns the measurement result to the wireless base station 1. The communication quality measurement control unit 15a receives the return result, and
Notify 5b. In the interference amount calculation unit 15b, each mobile station 3
Using the measurement results, the intra-cell interference I in and the out-of-cell interference I are calculated as follows.
【００４６】[0046]
【数５】 ただし、ここで、γi は、無線基地局１における全送信
電力の内当該移動局３への送信電力の占める割合であ
り、同一無線周波数帯域に通信用のチャネルのみが存在
するとした場合には、(Equation 5) Here, γ i is the ratio of the transmission power to the mobile station 3 to the total transmission power in the radio base station 1, and if only the communication channel exists in the same radio frequency band, ,
【数６】 である。さらに、αi ＝Ｉ／Ｉinを算出し、メモリアク
セス部１５ｄを通じてメモリ１９に記録する。この動作
は、呼受付判断に際して行う方法や、一定時間間隔毎に
実施する方法等様々な方法が考えられるがどのように構
成しても同様の効果が得られる。(Equation 6) It is. Further, α i = I / I in is calculated and recorded in the memory 19 through the memory access unit 15d. There are various methods for this operation, such as a method for determining whether to accept a call and a method for performing the operation at regular time intervals. However, the same effect can be obtained regardless of the configuration.
【００４７】呼の接続要求に際して干渉量算出部１５ｂ
は、新たな呼を接続してもセル内干渉とセル外干渉の比
αは変わらないとして、呼受付後の干渉量を推定する。
すなわち式（４）において、ｉ番目の移動局３と無線基
地局１との間の伝搬損失をＬi 、無線基地局１における
下り総送信電力をＰとすると、When a call connection request is made, an interference amount calculator 15b
Estimates the amount of interference after call acceptance, assuming that the ratio α of intra-cell interference and out-of-cell interference does not change even when a new call is connected.
That is, in equation (4), assuming that the propagation loss between the i-th mobile station 3 and the radio base station 1 is L i , and the total downlink transmission power in the radio base station 1 is P,
【数７】 なる関係がある。したがって、呼受付後に当該移動局３
にどの程度の送信電力を割り当てれば良いかをあらわす
γは、(Equation 7) There is a relationship. Therefore, after the call is accepted, the mobile station 3
Γ, which indicates how much transmission power should be allocated to
【数８】 と求められる。全移動局３についてのγi の和が１であ
る条件から無線基地局１の下り総送信電力Ｐが求めら
れ、当該移動局３への下り送信電力はγi Ｐで求められ
る。新たな呼およびすべての既接続呼について、得られ
た所要送信電力を最大送信電力と比較して、算出された
所要送信電力が最大送信電力を超えていた場合に、呼受
付拒否を呼受付制御装置１５に通知して処理を終了す
る。新たな呼およびすべての既接続呼について、算出さ
れた所要送信電力が最大送信電力以下であれば受付可と
判断しその旨を呼処理制御装置１７に通知し、同時に同
時接続数を更新しメモリアクセス部１５ｄを通じてメモ
リ１９上に新たな移動局３を登録する。(Equation 8) Is required. From the condition that the sum of γ i for all the mobile stations 3 is 1, the total downlink transmission power P of the radio base station 1 is determined, and the downlink transmission power to the mobile stations 3 is determined by γ i P. For new calls and all connected calls, the required transmission power obtained is compared with the maximum transmission power, and if the calculated required transmission power exceeds the maximum transmission power, call admission control is performed to reject call acceptance. The device 15 is notified and the process is terminated. If the calculated required transmission power is equal to or less than the maximum transmission power for a new call and all connected calls, it is determined that the call can be accepted, and the fact is notified to the call processing control device 17, and the number of simultaneous connections is updated at the same time. A new mobile station 3 is registered on the memory 19 through the access unit 15d.
【００４８】上記手順の中で、新たな呼の所要送信電力
を算出する際に、無線基地局１とその移動局３との間の
伝搬損失を知らなければならない。そのための方法とし
て、例えば、移動局３が待機中に送信電力一定で無線基
地局１から送信される制御用のチャネルの受信レベルを
測定し、接続要求が発生した時点で無線基地局１に通知
する方法等様々な方法が考えられるが、どのように構成
しても同様の効果が得られる。In the above procedure, when calculating the required transmission power of a new call, the propagation loss between the radio base station 1 and the mobile station 3 must be known. As a method for this, for example, the mobile station 3 measures the reception level of the control channel transmitted from the wireless base station 1 at a constant transmission power while waiting, and notifies the wireless base station 1 when a connection request occurs. Although various methods such as a method of performing the same are conceivable, a similar effect can be obtained regardless of the configuration.
【００４９】[0049]
【発明の効果】以上詳細に説明したように、本発明によ
れば、呼の受付後の干渉量を過去の測定結果に基づいて
測定し、受け付けようとする移動局およびすでにその無
線基地局に接続されている移動局の通信品質が、呼の受
付後に所要の通信品質を満たすかどうかを判断し、呼の
受付後に所要の通信品質を満たせない移動局が存在する
場合に、呼の受付を拒否することにより、強制切断など
により通信品質の劣化を招来することなく、さらには、
トラヒックの偏在や時間的変動に対しても柔軟に対応で
き、かつシステム容量の大きな移動通信システムとする
ことを可能とする。As described above in detail, according to the present invention, the amount of interference after the reception of a call is measured based on the past measurement results, and the mobile station that is to receive the call and the radio base station that has already received the call are measured. It is determined whether the communication quality of the connected mobile station satisfies the required communication quality after accepting the call.If there is a mobile station that cannot satisfy the required communication quality after accepting the call, the call acceptance is stopped. By refusing, without degrading the communication quality due to forced disconnection etc., furthermore,
It is possible to flexibly cope with uneven distribution of traffic and temporal fluctuation and to realize a mobile communication system having a large system capacity.
【図１】本発明に係る呼受付制御方法が適用される移動
通信システムの概略の構成を示すブロック図である。FIG. 1 is a block diagram showing a schematic configuration of a mobile communication system to which a call admission control method according to the present invention is applied.
【図２】無線基地局の構成を示すブロック図である。FIG. 2 is a block diagram illustrating a configuration of a wireless base station.
【図３】メモリ上に格納するデータの概念図である。FIG. 3 is a conceptual diagram of data stored on a memory.
【図４】本発明の呼受付制御方法を説明する制御フロー
チャートである。FIG. 4 is a control flowchart illustrating a call admission control method of the present invention.
【図５】呼受付制御装置の構成を機能的に説明するブロ
ック図である。FIG. 5 is a block diagram functionally illustrating the configuration of a call admission control device.
１ 無線基地局 ３ 移動局 １１ 送受信機 １３ 送受信機制御装置 １５ 呼受付制御装置 １５ａ 通信品質測定制御部 １５ｂ 干渉量算出部 １５ｃ 所要送信電力算出部 １５ｄ メモリアクセス部 １７ 呼処理制御装置 １９ メモリ Reference Signs List 1 radio base station 3 mobile station 11 transceiver 13 transceiver control device 15 call admission control device 15a communication quality measurement control unit 15b interference amount calculation unit 15c required transmission power calculation unit 15d memory access unit 17 call processing control device 19 memory
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H04B 1/69 - 1/713 H04B 7/24 - 7/26 H04Q 7/00 - 7/38 H04J 13/00 - 13/06 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H04B 1/69-1/713 H04B 7/24-7/26 H04Q 7/00-7/38 H04J 13 / 00-13/06
Claims (5)
で無線チャネルを介して通信を行う移動通信システムに
おける呼受付制御方法であって、 過去のデータに基づいて予測される新たに呼を受け付け
たときの干渉量を参照して、新たに呼を受け付けたとき
の当該呼に対応する移動局および当該無線基地局に既に
接続されている移動局の通信品質を予測したときに、所
定の通信品質を満たせない移動局が存在することが予測
された際には、この新たな呼の受け付けを拒否すること
を特徴とする呼受付制御方法。1. A call admission control method in a mobile communication system in which communication is performed between a plurality of radio base stations and a plurality of mobile stations via a radio channel, wherein a new method is provided based on past data. With reference to the interference amount at the time of accepting the call, when predicting the communication quality of the mobile station corresponding to the call at the time of newly accepting the call and the mobile station already connected to the radio base station, A call admission control method characterized by rejecting the reception of a new call when it is predicted that there is a mobile station that cannot satisfy a predetermined communication quality.
で無線チャネルを介して通信を行う移動通信システムに
おける呼受付制御装置であって、 新たに呼を受け付けたときの干渉量を過去のデータに基
づいて予測する第１の予測手段と、 この第１の予測手段で予測された干渉量を参照して、新
たに呼を受け付けたときの当該呼に対応する移動局およ
び当該無線基地局に既に接続されている移動局の通信品
質を予測する第２の予測手段と、 この第２の予測手段で新たに呼を受け付けたときに所定
の通信品質を満たせない移動局が存在することが予測さ
れたときには、当該新たな呼の受け付けを拒否する拒否
手段とを有することを特徴とする呼受付制御装置。2. A call admission control device in a mobile communication system for communicating via a radio channel between a plurality of radio base stations and a plurality of mobile stations, wherein the amount of interference when a new call is accepted is determined. First predicting means for predicting based on past data; and a mobile station corresponding to the call when a new call is received and the radio station when the call is newly accepted with reference to the interference amount predicted by the first predicting means. There are second prediction means for predicting the communication quality of a mobile station already connected to the base station, and a mobile station which cannot satisfy a predetermined communication quality when a new call is accepted by the second prediction means. Rejection means for rejecting the acceptance of the new call when it is predicted.
で無線チャネルを介して通信を行う移動通信システムに
おける呼受付制御装置であって、 過去の干渉量に係るデータに基づき、自無線基地局内か
らの干渉量と自無線基地局周辺の他の無線基地局からの
干渉量との比を算出する第１の算出手段と、 無線基地局が同時に複数の移動局と接続するときの新た
な呼受付後の同時接続する移動局の数から、当該無線基
地局内からの干渉量を算出する第２の算出手段と、 この第２の算出手段の算出結果と前記第１の算出手段の
算出結果に基づいて、新たな呼受付後の周辺の他の無線
基地局からの干渉量を算出する第３の算出手段と、 この第３の算出手段で算出された干渉量により、当該新
たな呼の受け付けを拒否する拒否手段とを有することを
特徴とする呼受付制御装置。3. A call admission control device in a mobile communication system in which communication is performed between a plurality of radio base stations and a plurality of mobile stations via a radio channel, wherein the call admission control device performs self-communication based on past data related to the amount of interference. First calculating means for calculating the ratio of the amount of interference from inside the wireless base station to the amount of interference from other wireless base stations around the own wireless base station; Second calculating means for calculating the amount of interference from within the radio base station from the number of simultaneously connected mobile stations after accepting a new call; and calculating results of the second calculating means and the first calculating means. A third calculating unit that calculates an interference amount from another wireless base station in the vicinity after receiving a new call based on the calculation result; and the new interference amount calculated by the third calculating unit. It has a rejection means for rejecting call acceptance. Call admission control device to.
る複数の移動局について、呼受付後の各移動局の所要送
信電力を算出し、この算出された所要送信電力が、受け
付けようとする呼に対応する移動局あるいは既に接続さ
れている移動局の最大送信電力を上回るときには所定の
通信品質が満たされないと判断して呼の受付を拒否する
ことを特徴とする請求項２又は３記載の呼受付制御装
置。4. The rejection means calculates, for a plurality of mobile stations connected to the base station, required transmission power of each mobile station after accepting a call, and the calculated required transmission power is to be accepted. 4. The system according to claim 2, wherein when the maximum transmission power of the mobile station corresponding to the call to be transmitted or the mobile station already connected is exceeded, it is determined that the predetermined communication quality is not satisfied, and the call is rejected. Call admission control device.
る複数の移動局に対する呼受付後の所要送信電力を算出
し、この算出された所要送信電力が、受け付けようとす
る呼に対応する移動局あるいは既に接続されている移動
局に対して予め定められた最大送信電力を上回るときに
は所定の通信品質が満たされないと判断して呼の受付を
拒否することを特徴とする請求項２又は３記載の呼受付
制御装置。5. The rejection means calculates required transmission power after a call is accepted for a plurality of mobile stations connected to the base station, and the calculated required transmission power corresponds to a call to be accepted. 4. When a predetermined maximum transmission power is exceeded for a mobile station or an already connected mobile station, a predetermined communication quality is not satisfied and call acceptance is rejected. The call admission control device according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7000759A JP2921739B2 (en) | 1995-01-06 | 1995-01-06 | Call admission control method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7000759A JP2921739B2 (en) | 1995-01-06 | 1995-01-06 | Call admission control method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08191481A JPH08191481A (en) | 1996-07-23 |
| JP2921739B2 true JP2921739B2 (en) | 1999-07-19 |
Family
ID=11482629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7000759A Expired - Fee Related JP2921739B2 (en) | 1995-01-06 | 1995-01-06 | Call admission control method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2921739B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3173565B2 (en) * | 1996-06-20 | 2001-06-04 | 日本電気株式会社 | Access control device in CDMA system |
| US7024186B1 (en) | 2000-08-15 | 2006-04-04 | Ntt Docomo, Inc. | Communication performance calculation method and communication performance calculation apparatus in mobile communication system, and blocking probability calculation method and blocking probability calculation apparatus in communication system, and recording medium |
| JP4276399B2 (en) * | 1999-11-24 | 2009-06-10 | 富士通株式会社 | Base station control station apparatus, radio terminal apparatus, and radio communication system |
| JP3844968B2 (en) | 2001-02-01 | 2006-11-15 | 株式会社エヌ・ティ・ティ・ドコモ | Call admission control apparatus and method |
| JP3682768B2 (en) | 2001-02-09 | 2005-08-10 | 株式会社エヌ・ティ・ティ・ドコモ | Call admission control device and base station |
| JP4154174B2 (en) | 2002-05-20 | 2008-09-24 | 株式会社エヌ・ティ・ティ・ドコモ | Traffic volume measuring device, traffic volume measuring method, and traffic volume measuring program |
| JP2004015342A (en) | 2002-06-05 | 2004-01-15 | Ntt Docomo Inc | Call acceptance control method, and communication system applied thereof |
| JPWO2005011319A1 (en) * | 2003-07-25 | 2007-09-27 | 日本電気株式会社 | Call admission control method and call admission control system |
| CN100574501C (en) | 2004-07-27 | 2009-12-23 | 日本电气株式会社 | Controlling uplink radio resource, base station equipment and radio network controller |
| CN1998155A (en) * | 2004-08-24 | 2007-07-11 | 三菱电机株式会社 | Data communication device, data communication method and data communication system |
| JP4433216B2 (en) | 2005-03-24 | 2010-03-17 | 日本電気株式会社 | CDMA mobile terminal, CDMA mobile communication method, and communication quality estimation method |
-
1995
- 1995-01-06 JP JP7000759A patent/JP2921739B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08191481A (en) | 1996-07-23 |
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