JP2000023229A - Handover system led by mobile terminal in cellular communication system including hierarchical cell - Google Patents
Handover system led by mobile terminal in cellular communication system including hierarchical cellInfo
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- JP2000023229A JP2000023229A JP19064198A JP19064198A JP2000023229A JP 2000023229 A JP2000023229 A JP 2000023229A JP 19064198 A JP19064198 A JP 19064198A JP 19064198 A JP19064198 A JP 19064198A JP 2000023229 A JP2000023229 A JP 2000023229A
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- Prior art keywords
- mobile terminal
- base station
- cell
- handover
- communication system
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、階層化セルを含む
セルラ通信システムにおけるハンドオーバー方式に関
し、特に、階層化セルを含むセルラ通信システムにおけ
るハンドオーバー方式に関する。The present invention relates to a handover method in a cellular communication system including hierarchical cells, and more particularly, to a handover method in a cellular communication system including hierarchical cells.
【０００２】[0002]
【従来の技術】セルラ通信システムでは他のエリアに比
べてトラヒック量が著しく多いエリアをカバーするため
に新しく追加されるトラヒック補完セル、あるいは障害
物の存在により局所的に電波の届かない不感地エリアを
カバーするため追加される不感地対策補完セルといった
階層化セル（マルチレイヤードセル）が使用されてい
る。不感知対策補完セルでは、ハンドオーバーをしにく
くするため、ハンドオーバーのしきい値を高く設定する
ことにより、通常であればハンドオーバーする電界強度
であったとしてもハンドオーバーを実行しない。またト
ラヒック補完対策セルでは、ハンドオーバーを促すため
ハンドオーバーのしきい値を通常低く設定している。こ
のような判定処理を従来では基地局制御装置でおこなっ
ていた。すなわち、従来のハンドオーバ方式では、移動
端末では通常のセル、トラヒック補完用セル、不感地対
策セルかを一切意識せず基地局制御装置に対してダイバ
ーシチ・ハンドオーバー追加要求を送信し、基地局制御
装置内でハンドオーバーを行うかの判定処理を行ってい
た。2. Description of the Related Art In a cellular communication system, a traffic supplement cell is newly added to cover an area having a much larger traffic volume than other areas, or a blind spot area where radio waves do not reach locally due to the presence of obstacles. Hierarchical cells (multi-layered cells) such as supplementary cells for blind spot countermeasures are added to cover the problem. In the non-sensing countermeasure complementing cell, in order to make handover difficult, the threshold value of handover is set high, so that the handover is not executed even if the electric field strength for handover is normal. In the traffic supplement countermeasure cell, the handover threshold is normally set low to encourage handover. Conventionally, such determination processing has been performed by the base station controller. That is, in the conventional handover method, the mobile terminal transmits a diversity handover addition request to the base station control device without being conscious of any of a normal cell, a traffic supplement cell, and a dead zone countermeasure cell, and controls the base station. The processing of determining whether to perform a handover in the apparatus has been performed.
【０００３】なお、関連する従来技術として、特開平２
−６９０２７号公報に記載の「移動通信通話チャネル制
御方式」、特開平５−７５５２９号公報に記載の「セル
ラ移動無線システム用の負荷共有制御方式」、特開平５
−３２７５９８号公報に記載の「自動車電話方式」、特
開平９−２００８５８号公報に記載の「通話回線設定方
法」、特許掲載公報第２７３９８５０号に記載の「移動
体通話システム」がある。As a related prior art, Japanese Patent Laid-Open No.
-69027, "Mobile communication communication channel control method", JP-A-5-75529, "Load sharing control method for cellular mobile radio system", JP-A-5-75929.
No. 3,327,598 discloses an "automobile telephone system", Japanese Unexamined Patent Publication No. 9-200858, a "communication line setting method", and Japanese Patent Publication No. 27399850, a "mobile communication system".
【０００４】[0004]
【発明が解決しようとする課題】ところで、Ｗ−ＣＤＭ
Ａ方式を採用する次世代移動通信システムでは移動端末
が主導でハンドオーバーを行う。SUMMARY OF THE INVENTION Incidentally, W-CDM
In the next-generation mobile communication system adopting the A method, a mobile terminal takes the initiative in performing handover.
【０００５】本発明は、階層化セルを含むセルラ通信シ
ステムにおいてハンドオーバー決定論理を移動端末で行
う移動端末主導のハンドオーバー方式を提供することを
目的とする。[0005] It is an object of the present invention to provide a mobile terminal initiated handover scheme in which a mobile terminal performs handover decision logic in a cellular communication system including hierarchical cells.
【０００６】[0006]
【課題を解決するための手段】本発明によるセルラ通信
システムにおける移動端末主導のハンドオーバー方式
は、自らが張るセルのハンドオーバ閾値の増減情報を報
知情報として移動端末に通知する手段を備える基地局
と、ハンドオーバーするための閾値と比較する各基地局
からの受信信号レベルを各基地局からの前記報知情報を
基にして増減する増減手段を備える移動端末と、を備え
ることを特徴とする。A mobile terminal-initiated handover system in a cellular communication system according to the present invention comprises: a base station having means for notifying to a mobile terminal, as broadcast information, information on increase / decrease of a handover threshold of a cell to which the mobile terminal is applied; And a mobile terminal having increase / decrease means for increasing / decreasing a reception signal level from each base station to be compared with a threshold value for handover based on the broadcast information from each base station.
【０００７】本発明による階層化セルを含むセルラ通信
システムにおける移動端末主導のハンドオーバー方式
は、自らが張るセルが通常のセルであるか階層化セルで
あるかを報知情報として移動端末に通知する手段を備え
る基地局と、ハンドオーバーするための閾値と比較する
各基地局からの受信信号レベルを各基地局からの前記報
知情報を基にして増減する増減手段を備える移動端末
と、を備えることを特徴とする。[0007] A mobile terminal-led handover method in a cellular communication system including a hierarchical cell according to the present invention notifies a mobile terminal as broadcast information as to whether a cell to be established is a normal cell or a hierarchical cell. And a mobile terminal having increase / decrease means for increasing / decreasing a reception signal level from each base station to be compared with a threshold for handover based on the broadcast information from each base station. It is characterized by.
【０００８】また、本発明による階層化セルを含むセル
ラ通信システムにおける移動端末主導のハンドオーバー
方式は、上記の階層化セルを含むセルラ通信システムに
おける移動端末主導のハンドオーバー方式において、前
記階層化セルはトラヒック補完対策セルを含むことを特
徴とする。The mobile terminal-initiated handover method in a cellular communication system including a hierarchical cell according to the present invention is the mobile terminal-initiated handover method in a cellular communication system including a hierarchical cell, wherein Is characterized by including a traffic supplement countermeasure cell.
【０００９】更に、本発明による階層化セルを含むセル
ラ通信システムにおける移動端末主導のハンドオーバー
方式は、上記の階層化セルを含むセルラ通信システムに
おける移動端末主導のハンドオーバー方式において、前
記階層化セルは不感地対策セルを含むことを特徴とす
る。Further, according to the present invention, there is provided a mobile terminal-initiated handover method in a cellular communication system including a hierarchical cell, the mobile terminal-initiated handover method in a cellular communication system including a hierarchical cell, comprising: Is characterized by including a dead zone countermeasure cell.
【００１０】更に、本発明による階層化セルを含むセル
ラ通信システムにおける移動端末主導のハンドオーバー
方式は、上記の階層化セルを含むセルラ通信システムに
おける移動端末主導のハンドオーバー方式において、前
記増減手段は前記トラヒック補完対策セルの基地局から
受信した信号のハンドオーバーするための閾値と比較す
るレベルを増加させることを特徴とする。Further, according to the present invention, there is provided a mobile terminal-initiated handover method in a cellular communication system including a hierarchical cell, in the above-mentioned mobile terminal-initiated handover method in a cellular communication system including a hierarchical cell. The level to be compared with a threshold value for handover of a signal received from the base station of the traffic supplement countermeasure cell is increased.
【００１１】更に、本発明による階層化セルを含むセル
ラ通信システムにおける移動端末主導のハンドオーバー
方式は、上記の階層化セルを含むセルラ通信システムに
おける移動端末主導のハンドオーバー方式において、前
記増減手段は前記不感地対策セルの基地局から受信した
信号のハンドオーバーするための閾値と比較するレベル
を減少させることを特徴とする。Further, according to the present invention, there is provided a mobile terminal-initiated handover method in a cellular communication system including a hierarchical cell, wherein the mobile terminal-initiated handover method in the cellular communication system including a hierarchical cell includes the increase / decrease means. The level compared with a threshold for handover of a signal received from a base station of the blind spot measure cell is reduced.
【００１２】[0012]
【発明の実施の形態】図１は本発明のトラヒック補完セ
ルの構成図を示す。１０は移動端末、１１、１２、１３
は基地局装置、１４は基地局装置を制御する基地局制御
装置、１５はダイバーシチ・ハンドオーバー・トランク
（ＤＨＴ）、１６、１７は通常のセル、１８はトラヒッ
ク補完用の階層化セルであり、それぞれ基地局装置１
１、１２、１３により電波の送受を行われていることを
表す。移動基地局装置１１、１２、１３では報知情報と
してセル１６、１７が通常のセル、セル１８が階層化セ
ルであることを移動端末に定期的に通知している。ダイ
バーシチハンドオーバー追加により基地局制御装置１４
内に位置するダイバーシチ・ハンドオーバー・トランク
１５は基地局装置（セクタ単位）間の接続を行い、移動
端末からの上り情報の選択合成の候補を１つ追加する。FIG. 1 shows a configuration diagram of a traffic supplement cell according to the present invention. 10 is a mobile terminal, 11, 12, and 13
Is a base station device, 14 is a base station control device for controlling the base station device, 15 is a diversity handover trunk (DHT), 16 and 17 are normal cells, 18 is a hierarchical cell for traffic supplementation, Each base station device 1
1, 12, and 13 indicate that radio waves are being transmitted and received. The mobile base station apparatuses 11, 12, and 13 regularly notify the mobile terminals as broadcast information that the cells 16 and 17 are normal cells and the cell 18 is a hierarchical cell. Base station controller 14 by adding diversity handover
The diversity handover trunk 15 located within the base station connects the base station apparatuses (in units of sectors) and adds one candidate for selective combination of uplink information from the mobile terminal.
【００１３】図２は本発明の不感地対策セルの構成図を
示す。２０は移動端末、２１、２２、２３は基地局装
置、２４は基地局制御装置、２５はダイバーシチ・ハン
ドオーバー・トランク（ＤＨＴ）、２６、２７は通常の
セル、２８は不感地対策用の階層化セルを表す。FIG. 2 shows a block diagram of a dead zone countermeasure cell according to the present invention. 20 is a mobile terminal, 21, 22, and 23 are base station devices, 24 is a base station control device, 25 is a diversity handover trunk (DHT), 26 and 27 are ordinary cells, and 28 is a layer for blind spot measures. Represents a chemical cell.
【００１４】まず、図１に示す本発明のトラヒック補完
対策セルの構成図に基づく動作を説明し、続いて、図３
では本発明の実施例の動作を示す。また、図２では不感
地対策セルの構成図に基づく動作を説明し、続いて図４
では本説明の実施例の動作を示す。First, the operation based on the configuration diagram of the traffic supplement countermeasure cell of the present invention shown in FIG. 1 will be described.
Now, the operation of the embodiment of the present invention will be described. FIG. 2 illustrates the operation based on the block diagram of the dead area countermeasure cell, and then, FIG.
Now, the operation of the embodiment of the present description will be described.
【００１５】図１において、移動基地局装置１１、１
２、１３は、報知情報としてセル１６、１７が通常のセ
ル、セル１８が階層化セルであることを移動端末１０に
定期的に通知している。移動端末１０は、通常セル１６
内で基地局装置１１により通話中であり、移動端末１０
の移動に伴い、通常セル１７，階層化セル１８に接近し
たことを示す。この時、移動端末１０が基地局装置１
１、１２、１３からの下り電波の受信レベルを示すの
が、図３である（図３、上図）。In FIG. 1, mobile base station apparatuses 11, 1
Reference numerals 2 and 13 regularly notify the mobile terminal 10 that the cells 16 and 17 are normal cells and the cell 18 is a hierarchical cell as broadcast information. The mobile terminal 10 has a normal cell 16
The mobile station 10
Indicates that the cell approaches the normal cell 17 and the hierarchical cell 18 with the movement of. At this time, the mobile terminal 10
FIG. 3 shows the reception levels of downlink radio waves from 1, 12, and 13 (FIG. 3, upper diagram).
【００１６】通話中の基地局装置１１からの受信レベル
は６２ｄＢ、基地局装置１２、１３からの受信レベルは
５３、５５ｄＢでありこの時点ではハンドオーバーを行
うためのしきい値６０ｄＢには達していない。しかし、
通話可能な最低レベルある５０ｄＢは超えているので通
話可能である。また基地局装置１３のセル１８はトラヒ
ック補完用のセルであるため、移動端末１０は、基地局
装置１３からの受信レベル５５ｄＢにマージン１０ｄＢ
を追加することでハンドオーバー追加するためのしきい
値６０ｄＢに達する（図３、下図）。この結果、移動端
末１０は、基地局制御装置１５に対してダイバーシチ・
ハンドオーバー追加要求を行い、基地局制御装置１５は
基地局装置１３間のリンク確立して基地局装置１１、１
３双方から電波の送受信を行う。The reception level from the base station apparatus 11 during a call is 62 dB and the reception levels from the base station apparatuses 12 and 13 are 53 and 55 dB. At this point, the threshold level for performing handover has reached 60 dB. Absent. But,
Since the lower limit of 50 dB, which is the minimum level at which communication is possible, is exceeded, communication is possible. Further, since the cell 18 of the base station device 13 is a cell for complementing traffic, the mobile terminal 10 sets the reception level 55 dB from the base station device 13 to a margin of 10 dB.
To reach the threshold of 60 dB for handover addition (FIG. 3, lower figure). As a result, the mobile terminal 10 provides the diversity control to the base station controller 15.
The base station controller 15 makes a handover addition request, and the base station controller 15 establishes a link between the base station apparatuses 13 to establish a link.
3 Transmit and receive radio waves from both sides.
【００１７】図２において、移動基地局装置２１、２
２、２３は、報知情報としてセル２６、２７が通常のセ
ル、セル２８が階層化セルであることを移動端末に定期
的に通知している。移動端末２０は、通常セル２６内で
基地局装置２１により通話中であり、移動端末２０の移
動に伴い、通常セル２７，階層化セル２８に接近したこ
とを示す。この時移動端末２０が基地局装置２１、２
２、２３からの下り電波の受信レベルを示すのが、図４
である（図４、上図）。通話中の基地局装置２１からの
受信レベルは６２ｄＢ、基地局装置６２、６３からの受
信レベルは５８、６３ｄＢであり、セル２７はハンドオ
ーバーを行うためのしきい値６０ｄＢには達していない
が、セル２８は達している。しかし、セル２８は不感地
対策セルであるため移動端末２０は、基地局装置２３か
らの受信レベル６３ｄＢからマージン１０ｄＢを引くこ
とでハンドオーバー追加するためのしきい値６０ｄＢに
達しない（図４、下図）。通話中のセル２６は通話可能
なレベル５０ｄＢを十分可能であるため、この結果移動
端末２０は基地局制御装置と一切ハンドオーバーを行わ
ずそのまま通話を行う。In FIG. 2, mobile base station apparatuses 21 and 2
2 and 23 regularly notify the mobile terminal that the cells 26 and 27 are normal cells and the cell 28 is a hierarchical cell as broadcast information. The mobile terminal 20 indicates that the base station device 21 is in a call within the normal cell 26 and that the mobile terminal 20 approaches the normal cell 27 and the hierarchical cell 28 as the mobile terminal 20 moves. At this time, the mobile terminal 20 is
FIG. 4 shows the reception level of the downstream radio waves from the transmission lines 2 and 23.
(FIG. 4, upper diagram). The reception level from the base station device 21 during a call is 62 dB, the reception level from the base station devices 62 and 63 is 58 and 63 dB, and the cell 27 has not reached the threshold value 60 dB for performing handover. , Cell 28 has been reached. However, since the cell 28 is a blind spot countermeasure cell, the mobile terminal 20 does not reach the threshold 60 dB for adding a handover by subtracting the margin 10 dB from the reception level 63 dB from the base station device 23 (FIG. 4, Below). Since the cell 26 during a call can sufficiently have a talkable level of 50 dB, as a result, the mobile terminal 20 performs the call without any handover with the base station controller.
【００１８】[0018]
【発明の効果】以上説明したように、本発明によれば、
階層化セルへのハンドオーバー地点を階層化セルの属性
に応じて、制御することができる。As described above, according to the present invention,
The handover point to the hierarchical cell can be controlled according to the attribute of the hierarchical cell.
【００１９】また本発明は、移動端末内であらかじめハ
ンドオーバーを行うかどうかの判定を行うため移動端
末、基地局制御装置間の無線信号送受の必要がなくトラ
ヒック量の軽減という意味でも有効である。Further, the present invention is effective in terms of reducing the amount of traffic since there is no need to transmit / receive a radio signal between the mobile terminal and the base station controller because the mobile terminal determines in advance whether or not to perform handover. .
【図１】本発明を適用するトラヒック補完対策セルを含
むセルラ通信システムの構成図である。FIG. 1 is a configuration diagram of a cellular communication system including a traffic supplement countermeasure cell to which the present invention is applied.
【図２】本発明を適用する不感地対策セルを含むセルラ
通信システムの構成図である。FIG. 2 is a configuration diagram of a cellular communication system including a blind spot countermeasure cell to which the present invention is applied.
【図３】本発明の実施形態によるトラヒック補完セルへ
のハンドオーバーを説明するための図である。FIG. 3 is a diagram illustrating a handover to a traffic supplement cell according to an embodiment of the present invention.
【図４】本発明の実施形態による不感地対策用セルへの
ハンドオーバーを説明するための図である。FIG. 4 is a diagram for explaining a handover to a dead area countermeasure cell according to the embodiment of the present invention;
１０，２０ 移動端末 １１，１２，１３，２１，２２，２３ 基地局装置 １４，２４ 基地局制御装置 １５，２５ ダイバーシチ・ハンドオーバー・トランク
（ＤＨＴ） １６，１７，２６，２７ 通常のセル １８ トラヒック補完用の階層化セル ２８ 不感地対策用の階層化セル10,20 mobile terminal 11,12,13,21,22,23 base station apparatus 14,24 base station controller 15,25 diversity handover trunk (DHT) 16,17,26,27 normal cell 18 traffic Hierarchical cell for complementation 28 Hierarchical cell for blind spot countermeasures
Claims (6)
減情報を報知情報として移動端末に通知する手段を備え
る基地局と、 ハンドオーバーするための閾値と比較する各基地局から
の受信信号レベルを各基地局からの前記報知情報を基に
して増減する増減手段を備える移動端末と、 を備えることを特徴とするセルラ通信システムにおける
移動端末主導のハンドオーバー方式。1. A base station having means for notifying mobile terminals of increase / decrease information of a handover threshold value of a cell set by the base station as broadcast information, and a reception signal level from each base station to be compared with a handover threshold value. A mobile terminal having an increasing / decreasing means for increasing / decreasing based on the broadcast information from a base station; and a mobile terminal-driven handover method in a cellular communication system.
層化セルであるかを報知情報として移動端末に通知する
手段を備える基地局と、 ハンドオーバーするための閾値と比較する各基地局から
の受信信号レベルを各基地局からの前記報知情報を基に
して増減する増減手段を備える移動端末と、 を備えることを特徴とする階層化セルを含むセルラ通信
システムにおける移動端末主導のハンドオーバー方式。2. A base station comprising means for notifying a mobile terminal as broadcast information as to whether a cell established by itself is a normal cell or a hierarchical cell, and each base station comparing with a threshold for handover A mobile terminal having an increasing / decreasing means for increasing / decreasing a signal level received from the base station based on the broadcast information from each base station; and a mobile terminal initiated handover in a cellular communication system including a hierarchical cell. method.
ラ通信システムにおける移動端末主導のハンドオーバー
方式において、前記階層化セルはトラヒック補完対策セ
ルを含むことを特徴とする階層化セルを含むセルラ通信
システムにおける移動端末主導のハンドオーバー方式。3. The mobile terminal initiated handover method in a cellular communication system including a hierarchical cell according to claim 2, wherein the hierarchical cell includes a traffic supplement countermeasure cell. A mobile terminal initiated handover scheme in a cellular communication system.
むセルラ通信システムにおける移動端末主導のハンドオ
ーバー方式において、前記階層化セルは不感地対策セル
を含むことを特徴とする階層化セルを含むセルラ通信シ
ステムにおける移動端末主導のハンドオーバー方式。4. A mobile terminal-initiated handover system in a cellular communication system including a hierarchical cell according to claim 2 or 3, wherein the hierarchical cell includes a blind spot countermeasure cell. A mobile terminal initiated handover scheme in a cellular communication system including:
ラ通信システムにおける移動端末主導のハンドオーバー
方式において、前記増減手段は前記トラヒック補完対策
セルの基地局から受信した信号のハンドオーバーするた
めの閾値と比較するレベルを増加させることを特徴とす
る階層化セルを含むセルラ通信システムにおける移動端
末主導のハンドオーバー方式。5. The mobile terminal initiated handover method in a cellular communication system including a hierarchical cell according to claim 3, wherein the increasing / decreasing means performs a handover of a signal received from a base station of the traffic supplement countermeasure cell. A mobile terminal-driven handover method in a cellular communication system including a hierarchical cell, wherein a level to be compared with a threshold value is increased.
ラ通信システムにおける移動端末主導のハンドオーバー
方式において、前記増減手段は前記不感地対策セルの基
地局から受信した信号のハンドオーバーするための閾値
と比較するレベルを減少させることを特徴とする階層化
セルを含むセルラ通信システムにおける移動端末主導の
ハンドオーバー方式。6. The mobile terminal-driven handover method in a cellular communication system including a hierarchical cell according to claim 4, wherein the increasing / decreasing means performs a handover of a signal received from a base station of the blind spot countermeasure cell. A mobile terminal-driven handover method in a cellular communication system including a hierarchical cell, wherein a level to be compared with a threshold value is reduced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19064198A JP3035906B2 (en) | 1998-07-06 | 1998-07-06 | A mobile terminal initiated handover scheme in a cellular communication system including hierarchical cells |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19064198A JP3035906B2 (en) | 1998-07-06 | 1998-07-06 | A mobile terminal initiated handover scheme in a cellular communication system including hierarchical cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000023229A true JP2000023229A (en) | 2000-01-21 |
| JP3035906B2 JP3035906B2 (en) | 2000-04-24 |
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ID=16261462
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19064198A Expired - Fee Related JP3035906B2 (en) | 1998-07-06 | 1998-07-06 | A mobile terminal initiated handover scheme in a cellular communication system including hierarchical cells |
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| Country | Link |
|---|---|
| JP (1) | JP3035906B2 (en) |
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| JP2006517753A (en) * | 2003-03-08 | 2006-07-27 | サムスン エレクトロニクス カンパニー リミテッド | System and method for performing a handover operation in a broadband wireless access communication system |
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