JP2003283510A - Packet communication device and system in communication for moving object - Google Patents
Packet communication device and system in communication for moving objectInfo
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- JP2003283510A JP2003283510A JP2002084204A JP2002084204A JP2003283510A JP 2003283510 A JP2003283510 A JP 2003283510A JP 2002084204 A JP2002084204 A JP 2002084204A JP 2002084204 A JP2002084204 A JP 2002084204A JP 2003283510 A JP2003283510 A JP 2003283510A
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- Prior art keywords
- base station
- mobile
- packet
- packets
- mobile unit
- Prior art date
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- Mobile Radio Communication Systems (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、移動体通信におけ
るパケット通信装置および同方式に関し、特に、移動体
通信におけるハンドオーバ・バッファの重複送信防止と
共にパケットロスの防止を図った、移動体通信における
パケット通信装置および同方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet communication device and method in mobile communication, and more particularly to a packet communication in mobile communication for preventing duplicate transmission of a handover buffer in mobile communication and packet loss. The present invention relates to a communication device and the same system.
【0002】[0002]
【従来の技術】従来、移動体通信におけるパケット通信
装置および同方式は、移動体の基地局との切換時の通信
における信頼性・効率性を高めるに適用される。例え
ば、バッファが収容するパケットの数が、移動体が切り
替え時にロスしたパケットの数よりも多い時に、移動体
が同じパケットを2回受信することを防止する方法に適
用される。2. Description of the Related Art Conventionally, a packet communication device and the same system in mobile communication have been applied to improve reliability and efficiency in communication when switching between a mobile and a base station. For example, it is applied to a method for preventing a mobile from receiving the same packet twice when the number of packets accommodated in the buffer is larger than the number of packets lost by the mobile at the time of switching.
【0003】例えば、移動体が基地局を切替える際に、
パケットを受信できなくパケットロスが発生することが
ある。このようなパケットロスを抑えるために、パケッ
トを複製して次に接続する基地局にも転送するバイカス
ト(bi-cast) 方式が、従来効果的であるとされている。
このバイカスト方式では、パケットロスを最大限に防止
するため、移動先の基地局でバイカスト転送されてきた
パケットを一旦バッファに保存し、移動体がカバーエリ
ア内に到着した後、バッファからパケットを取りだして
移動体に送信する。For example, when a mobile unit switches base stations,
Packets may not be received and packet loss may occur. In order to suppress such packet loss, a bi-cast method in which a packet is duplicated and transferred to a base station to which the packet is next connected is considered to be effective.
In this bi-cast method, in order to prevent packet loss to the maximum extent, packets that have been transferred by bi-cast at the movement-destination base station are temporarily stored in a buffer, and after the mobile arrives in the coverage area, the packets are taken out from the buffer. And send it to the mobile.
【0004】しかし、バッファが収容するパケットの数
が、移動体のカバーエリア切り替え時にロスしたパケッ
トの数よりも多い時には、移動体が同じパケットを2回
受信することがあり、この結果として無線通信の効率が
下がる(図3)。また、逆の場合では、パケットロスを
回避できない場合も生じる。このような現象において、
バッファの最適サイズが、移動体の移動速度や、無線リ
ンクの帯域幅によって変化する。このため、従来、状況
に応じて動的・効率的に制御することが困難である。However, when the number of packets accommodated in the buffer is larger than the number of packets lost when the mobile unit switches the coverage area, the mobile unit may receive the same packet twice, resulting in wireless communication. Efficiency is reduced (Fig. 3). Also, in the opposite case, packet loss may not be avoided. In such a phenomenon,
The optimum size of the buffer changes depending on the moving speed of the mobile body and the bandwidth of the wireless link. Therefore, conventionally, it is difficult to control dynamically and efficiently according to the situation.
【0005】図3において、従来の動作手順例を以下に
説明する。今、移動体が、基地局BS1、 BS2、 B
S3の順に、各基地局を切替ながら移動すると仮定す
る。この仮定において、移動体と基地局とは下記の手順
を踏む。
(1) 基地局BS1が、移動体宛のIP(Internet Prot
ocol) パケットを、移動体と基地局BS2の両方に配送
する。
(2)基地局BS2は、基地局BS1から配送されてき
たIPパケットを、バッファに保存する。
(3)移動体は、基地局BS1から基地局BS2に接続
を切替た後に、基地局BS2に経路更新通知を送信す
る。In FIG. 3, an example of a conventional operation procedure will be described below. Now, the mobile is the base station BS1, BS2, B
It is assumed that each base station is moved while switching in the order of S3. Under this assumption, the mobile and the base station perform the following procedure. (1) The base station BS1 sends an IP (Internet Prot
ocol) packet to both the mobile and the base station BS2. (2) The base station BS2 stores the IP packet delivered from the base station BS1 in a buffer. (3) The mobile unit transmits a route update notification to the base station BS2 after switching the connection from the base station BS1 to the base station BS2.
【0006】(4)新たな接続基地局BS2が、経路更
新通知を受け取った後に、新たな接続基地局BS2は、
バッファ内に保存している移動体宛のパケットを、移動
体へ送信する。しかし、パッファ内のパケット数が切り
替え時にロスしたパケット数よりも多いときには、移動
体が同じパケット(図3のp1とp2)を重複受信する
ことになる。(4) After the new connection base station BS2 receives the route update notification, the new connection base station BS2
The packet addressed to the mobile station stored in the buffer is transmitted to the mobile station. However, when the number of packets in the puffer is larger than the number of packets lost at the time of switching, the mobile unit receives the same packet (p1 and p2 in FIG. 3) in duplicate.
【0007】本発明と技術分野の類似する先願発明例1
として、特開平09−275384号公報がある。本先
願発明例1では、送信装置は、各メディアデータから生
成したメディア毎のパケットを当該パケット数を付して
パケットバッファに保持し、パケットバッファに保持さ
れたパケット数の比較結果を主制御部がRAM内のテー
ブルに記述して管理している。このパケット列によっ
て、効率のよいマルティメディア伝送が実現される、と
している。Prior invention example 1 similar in technical field to the present invention
Japanese Patent Laid-Open No. 09-275384. In the first invention example of the prior application, the transmission device holds a packet for each medium generated from each piece of media data in the packet buffer with the number of packets, and performs main control on the comparison result of the number of packets held in the packet buffer. The department describes and manages the table in the RAM. According to this packet sequence, efficient multimedia transmission can be realized.
【0008】先願発明例2としての特開平10−243
458号公報では、フレームをスロット単位に分割し、
このスロットに同一伝送対象のデータを分割した後続フ
レームがあることを示す後続識別情報を付加している。
これにより、移動機からの伝送スロットの中断がなくて
バッファ所要量が少なく、伝送効率のよい無線パケット
伝送システムが得られるとしている。Japanese Patent Application Laid-Open No. 10-243 as Example 2 of the prior application
In Japanese Patent No. 458, the frame is divided into slots,
Subsequent identification information indicating that there is a subsequent frame obtained by dividing the same transmission target data is added to this slot.
As a result, there is no interruption of the transmission slot from the mobile device, the required buffer amount is small, and a wireless packet transmission system with high transmission efficiency can be obtained.
【0009】[0009]
【発明が解決しようとする課題】しかしながら、上記従
来技術では、ハンドオーバ時のパケットロスを最大限に
抑えるために、ハンドオーバ用のバッファサイズを出来
るだけ大きくした方がよいが、バッファ内に保存したパ
ケットのうち、移動体が既に受信したものが含まれる可
能性が高い。このようなパケットを移動体へ送信する
と、移動体が同じパケットを2回受信することになり、
通信特性および機能部の活用性を低下させるという問題
点を伴う。However, in the above-mentioned prior art, in order to minimize the packet loss at the time of handover, it is better to make the buffer size for handover as large as possible. Of these, the ones that the mobile has already received are likely to be included. If you send such a packet to the mobile, the mobile will receive the same packet twice,
There is a problem in that the communication characteristics and the utilization of the functional unit are reduced.
【0010】本発明は、重複送信を回避し通信特性およ
び機能部の活用性を向上化させた、移動体通信における
パケット通信装置および同方式を提供することを目的と
する。It is an object of the present invention to provide a packet communication device and a system therefor in mobile communication, which avoids redundant transmission and improves communication characteristics and utilization of functional units.
【0011】より詳細には、ハンドオーバ用バッファを
管理する基地局(もしくはルータ)は、移動体が切替え
時に受信できなかったパケットの数を把握できれば、受
信できなかったパケットのみをバッファから取出して移
動体へ送信し、重複送信を回避できる。本発明は、この
重複送信を回避させた移動体通信におけるパケット通信
装置および同方式を提供することを目的とする。More specifically, if the base station (or router) managing the handover buffer can grasp the number of packets that the mobile unit could not receive at the time of switching, only the packets that could not be received are moved from the buffer. It can be sent to the body to avoid duplicate transmissions. It is an object of the present invention to provide a packet communication device and the same system in mobile communication in which this duplicate transmission is avoided.
【0012】[0012]
【課題を解決するための手段】かかる目的を達成するた
め、本発明の移動体通信におけるパケット通信装置は、
移動体と基地局とで構成される移動体通信におけるパケ
ット通信システムであり、移動体が基地局(BS1)と
のリンク確立をした後に受信したパケット数(n1)を
記録し、基地局(BS1)が移動体へ送信済みのパケッ
ト数を含むバイカスト通知を基地局(BS1)が他の基
地局(BS2)に送信し、基地局(BS1)が移動体宛
のパケットを該移動体と他の基地局(BS2)の両方へ
配送し、基地局(BS1)から配送されて来た移動体宛
のパケット数(n2)を他の基地局(BS2)がバッフ
ァに記録し、基地局(BS1)から他の基地局(BS
2)に切替えた後に移動体が該他の基地局(BS2)に
経路更新通知を送信し、他の基地局(BS2)はハンド
オーバ用バッファから最後のnパケットを取出し移動体
へ送信し、パケットロスの防止を図ったことを特徴とし
ている。In order to achieve the above object, a packet communication device in mobile communication according to the present invention comprises:
A packet communication system in mobile communication composed of a mobile unit and a base station, wherein the number of packets (n1) received by the mobile unit after establishing a link with the base station (BS1) is recorded and the base station (BS1) is recorded. ) Sends a bicast notification containing the number of packets already transmitted to the mobile unit to the base station (BS1) to another base station (BS2), and the base station (BS1) sends a packet addressed to the mobile unit to the mobile unit and another unit. The number of packets (n2) delivered to both the base station (BS2) and addressed to the mobile station delivered from the base station (BS1) is recorded in the buffer by the other base station (BS2), and the base station (BS1) To other base stations (BS
After switching to 2), the mobile sends a route update notification to the other base station (BS2), and the other base station (BS2) takes the last n packets from the handover buffer and sends them to the mobile. The feature is that the loss is prevented.
【0013】また、上記の移動体が他の基地局(BS
2)に送信する経路更新通知には移動体が基地局(BS
1)で受信したパケット数(n1)を含み、他の基地局
(BS2)がパケット数(n1)とパケット数(n2)
の差“n=n2−n1”を計算し、他の基地局(BS
2)がハンドオーバ用バッファから最後のnパケットを
取出し、移動体へ送信後にn個のパケットの送信完了後
に、他の基地局(BS2)はその他の基地局(BS3)
へバイカスト通知を送信し、他の基地局(BS2)がそ
の他の基地局(BS3)に送信するバイカスト通知に
は、移動体へ送信済みのパケット数nを含み、パケット
ロスの防止と共に移動体通信におけるハンドオーバ・バ
ッファの重複送信防止を図るとよい。[0013] Further, the above-mentioned mobile unit is used by another base station (BS
2) the route update notification is sent to the base station (BS
The number of packets (n1) received in 1) is included, and the number of packets (n1) and the number of packets (n2) are received by another base station (BS2).
Difference “n = n2-n1” of the other base stations (BS
2) takes out the last n packets from the handover buffer, and after the transmission of n packets to the mobile body is completed, the other base station (BS2) is changed to the other base station (BS3).
To the other base station (BS3) is transmitted to the other base station (BS3), the number of packets already transmitted to the mobile body is included in the bicast notification, and packet loss is prevented and mobile communication is performed. It is advisable to prevent duplicate transmission of the handover buffer in.
【0014】請求項3記載の発明の移動体通信における
パケット通信方式は、移動体が基地局(BS1)とのリ
ンク確立をした後に受信したパケット数(n1)を記録
し、基地局(BS1)が移動体へ送信済みのパケット数
を含むバイカスト通知を基地局(BS1)が他の基地局
(BS2)に送信し、基地局(BS1)が移動体宛のパ
ケットを該移動体と他の基地局(BS2)の両方へ配送
し、基地局(BS1)から配送されて来た移動体宛のパ
ケット数(n2)を他の基地局(BS2)がバッファに
記録し、基地局(BS1)から他の基地局(BS2)に
切替えた後に移動体が該他の基地局(BS2)に経路更
新通知を送信し、他の基地局(BS2)はハンドオーバ
用バッファから最後のnパケットを取出し移動体へ送信
し、パケットロスの防止を図ったことを特徴としてい
る。In the packet communication system for mobile communication according to the third aspect of the present invention, the number of packets (n1) received by the mobile unit after establishing the link with the base station (BS1) is recorded, and the base station (BS1) is recorded. The base station (BS1) transmits to the other base station (BS2) a bicast notification including the number of packets already transmitted to the mobile body, and the base station (BS1) transmits the packet addressed to the mobile body to the mobile body and the other base. The number of packets (n2) delivered to both the station (BS2) and addressed to the mobile station delivered from the base station (BS1) is recorded in a buffer by another base station (BS2), and the packet is transmitted from the base station (BS1). After switching to another base station (BS2), the mobile sends a route update notification to the other base station (BS2), and the other base station (BS2) extracts the last n packets from the handover buffer and Send to, packet loss It is characterized in that tried to prevent.
【0015】また、上記の移動体が他の基地局(BS
2)に送信する経路更新通知には移動体が基地局(BS
1)で受信したパケット数(n1)を含み、他の基地局
(BS2)がパケット数(n1)とパケット数(n2)
の差“n=n2−n1”を計算し、パケットロスの防止
と共に移動体通信におけるハンドオーバ・バッファの重
複送信防止を図り、他の基地局(BS2)がハンドオー
バ用バッファから最後のnパケットを取出し、移動体へ
送信後にn個のパケットの送信完了後に、他の基地局
(BS2)はその他の基地局(BS3)へバイカスト通
知を送信するとよい。In addition, the above-mentioned mobile unit is used by another base station (BS
2) the route update notification is sent to the base station (BS
The number of packets (n1) received in 1) is included, and the number of packets (n1) and the number of packets (n2) are received by another base station (BS2).
The difference "n = n2-n1" is calculated to prevent packet loss and duplicate transmission of the handover buffer in mobile communication, and another base station (BS2) extracts the last n packets from the handover buffer. , The other base station (BS2) may transmit the bicast notification to the other base station (BS3) after the transmission of n packets is completed after the transmission to the mobile body.
【0016】さらに、上記の他の基地局(BS2)がそ
の他の基地局(BS3)に送信するバイカスト通知に
は、移動体へ送信済みのパケット数nを含み、パケット
は、IPパケットであるとするとよい。Further, the above-mentioned other base station (BS2) transmits to the other base station (BS3) the bicast notification includes the number n of packets already transmitted to the mobile body, and the packet is an IP packet. Good to do.
【0017】[0017]
【発明の実施の形態】次に、添付図面を参照して本発明
による移動体通信におけるパケット通信装置および同方
式の実施の形態を詳細に説明する。図1および図2を参
照すると、本発明の移動体通信における移動体通信にお
けるパケット通信装置および同方式の一実施形態が示さ
れている。BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of a packet communication device and a system in mobile communication according to the present invention will be described in detail with reference to the accompanying drawings. Referring to FIG. 1 and FIG. 2, an embodiment of a packet communication device in mobile communication and a system thereof in mobile communication of the present invention is shown.
【0018】図1は、本発明の移動体通信におけるパケ
ット通信装置および同方式が適用される、システム構成
図を示している。移動体10は、現在位置に応じて適
宜、基地局BS1、BS2、BS3、BS4と接続され
る。この基地局BS1およびBS2は、一方のルータ2
1と接続される。また、基地局BS3およびBS4は、
他方のルータ22と接続される。これらの接続関係にお
て、移動体ネットワークが構成される。上記構成のネッ
トワークにおいて、本実施形態の移動体通信におけるパ
ケット通信装置および同方式は、移動体10移動に際し
上記基地局BS1、BS2、BS3、BS4と順次接続
先を切り換えるが、この切換にかえに際し、通信動作の
確実性を高めるものである。FIG. 1 shows a system configuration diagram to which the packet communication device and the same system in the mobile communication of the present invention are applied. The mobile unit 10 is appropriately connected to the base stations BS1, BS2, BS3, BS4 according to the current position. The base stations BS1 and BS2 are the routers 2 on one side.
Connected with 1. Also, the base stations BS3 and BS4 are
It is connected to the other router 22. A mobile network is configured with these connection relationships. In the network having the above configuration, the packet communication device and the method for mobile communication according to the present embodiment sequentially switch the connection destinations with the base stations BS1, BS2, BS3, BS4 when the mobile unit 10 moves, but in the case of this switching , It increases the certainty of communication operation.
【0019】(実施例の動作例)図2を参照すると、移
動体10が基地局BS1、BS2、BS3の順に接続基
地局を切替ながら移動するに際し、順次接続先を切りか
える下記の切換手順例(1)〜(8)を示している。
(1) 移動体10は、基地局BS1とのリンク確立が出
来た後に、受信したIPパケットの数n1を記録する。
(2)基地局BS1は、基地局BS2にバイカスト通知
を送信する。バイカスト通知には、基地局BS1が移動
体10へ送信済みのパケット数を含む。(Example of operation of the embodiment) Referring to FIG. 2, when the mobile unit 10 moves while switching the connected base stations in the order of the base stations BS1, BS2, BS3, the following switching procedure example for sequentially switching the connection destination ( 1) to (8) are shown. (1) The mobile unit 10 records the number n1 of IP packets received after establishing the link with the base station BS1. (2) The base station BS1 transmits a bicast notification to the base station BS2. The bicast notification includes the number of packets that the base station BS1 has already transmitted to the mobile unit 10.
【0020】(3)基地局BS1は、移動体10宛のI
Pパケットを移動体10と基地局BS2の両方へ配送す
る。
(4)基地局BS2は、基地局BS1から配送されて来
た移動体10宛のIPパケットをバッファに保存し、そ
の数n2を記録する。
(5)移動体10が基地局BS1から基地局BS2に切
替わった後、基地局BS2に経路更新通知を送信する。
この経路更新通知には、移動体10が基地局BS1で受
信したIPパケットの数n1を含む。(3) The base station BS1 sends I to the mobile unit 10.
The P packet is delivered to both the mobile 10 and the base station BS2. (4) The base station BS2 saves the IP packet addressed to the mobile unit 10 delivered from the base station BS1 in the buffer and records the number n2 thereof. (5) After the mobile unit 10 switches from the base station BS1 to the base station BS2, it transmits a route update notification to the base station BS2.
This route update notification includes the number n1 of IP packets received by the mobile unit 10 at the base station BS1.
【0021】(6)基地局BS2は、n1とn2の差n
=n2−n1を計算する。
(7)基地局BS2は、ハンドオーバ用バッファから最
後のnパケットを取出し移動体10へ送信する。
(8)n個のIPパケットの送信が完了したら、基地局
BS2は基地局BS3にバイカスト通知を送信する。バ
イカスト通知には、移動体10へ送信済みのIPパケッ
ト数nを含む。(6) The base station BS2 determines the difference n between n1 and n2.
= N2-n1 is calculated. (7) The base station BS2 extracts the last n packets from the handover buffer and transmits them to the mobile unit 10. (8) When the transmission of n IP packets is completed, the base station BS2 transmits a bicast notification to the base station BS3. The bicast notification includes the number n of IP packets transmitted to the mobile unit 10.
【0022】(効果)ハンドオーバ用バッファから、移
動体10が切替時にロスしたパケットだけを送信するた
め、無線リンクの利用効率が上がる、ハンドオーバ用の
バッファサイズを大きく設定し、パケットロスを最大限
に抑えることが可能である。移動体10がハンドオーバ
以外のときにも、パケットロスが発生する場合、本発明
の提案方法によっても重複送信を完全に回避することは
できないが、改善することができる。(Effect) Since the mobile unit 10 transmits only the packet lost at the time of switching from the handover buffer, the utilization efficiency of the wireless link is improved, and the buffer size for handover is set large to maximize the packet loss. It is possible to suppress. When packet loss occurs even when the mobile unit 10 is not in handover, duplicate transmission cannot be completely avoided by the proposed method of the present invention, but it can be improved.
【0023】(他の実施例)尚、上記の実施例では、ス
テップ(4)において、基地局BS1から配送されて来
た移動体10宛のIPパケットを、基地局BS2がバッ
ファに保存し、その数n2を記録する手順としている。
この変化例として、バッファをルータ21側に実装して
も良い。本変化例に基づけば、上記のステップ(4)
は、ルータ21が、基地局BS1から配送されて来た移
動体10宛のIPパケットをバッファに保存し、その数
n2を記録することとなる。(Other Embodiments) In the above embodiment, the base station BS2 stores the IP packet addressed to the mobile unit 10 delivered from the base station BS1 in the buffer in step (4), The procedure is to record the number n2.
As a modification of this, a buffer may be mounted on the router 21 side. Based on this variation, the above step (4)
The router 21 saves the IP packet addressed to the mobile unit 10 delivered from the base station BS1 in the buffer and records the number n2 thereof.
【0024】上記の各実施例によれば、移動体10と、
移動体10のハンドオーバ用バッファを管理している基
地局またはルータとの両方が、移動体10宛のパケット
数を記録する。よって、移動体10が新しい基地局
(b)に切替えた後、前の基地局(a)で受信したIP
パケットの数を、新しい基地局(b)に通知する。これ
により、新しい基地局(b)は、移動体10が切替時に
ロスしたパケットの数を把握することができ、ロスした
パケットだけをバッファから取出し、移動体10に送信
することができる。According to each of the above embodiments, the moving body 10 and
Both the base station or the router that manages the handover buffer of the mobile unit 10 records the number of packets addressed to the mobile unit 10. Therefore, after the mobile unit 10 switches to the new base station (b), the IP received by the previous base station (a)
Notify the new base station (b) of the number of packets. As a result, the new base station (b) can grasp the number of packets lost by the mobile unit 10 at the time of switching, and can take out only the lost packet from the buffer and transmit it to the mobile unit 10.
【0025】なお、上述の実施形態は本発明の好適な実
施の一例である。ただし、これに限定されるものではな
く、本発明の要旨を逸脱しない範囲内において種々変形
実施が可能である。The above-mentioned embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.
【0026】[0026]
【発明の効果】以上の説明より明らかなように、本発明
の移動体通信におけるパケット通信装置および同方式
は、移動体が基地局(BS1)とのリンク確立をした後
に受信したパケット数(n1)を記録し、基地局(BS
1)が移動体へ送信済みのパケット数を含むバイカスト
通知を他の基地局(BS2)に送信し、さらに移動体宛
のパケットを該移動体と他の基地局(BS2)の両方へ
配送し、この基地局(BS1)から配送されて来た移動
体宛のパケット数(n2)を他の基地局(BS2)がバ
ッファに記録する。本状態で、基地局(BS1)から他
の基地局(BS2)に切替えた後に移動体が他の基地局
(BS2)に経路更新通知を送信し、他の基地局(BS
2)はハンドオーバ用バッファから最後のnパケットを
取出し移動体へ送信している。これにより、パケットロ
スの防止と重複送信を回避し通信特性および機能部の活
用性を向上化させることが可能となる。As is apparent from the above description, in the packet communication device and the method for mobile communication of the present invention, the number of packets (n1) received after the mobile establishes a link with the base station (BS1). ) Is recorded and the base station (BS
1) sends a bicast notification including the number of packets already transmitted to the mobile unit to another base station (BS2), and further delivers a packet addressed to the mobile unit to both the mobile unit and another base station (BS2). Another base station (BS2) records the number of packets (n2) addressed to the mobile body delivered from this base station (BS1) in a buffer. In this state, after switching from the base station (BS1) to another base station (BS2), the mobile sends a route update notification to the other base station (BS2), and the other base station (BS2)
2) fetches the last n packets from the handover buffer and sends them to the mobile unit. This makes it possible to prevent packet loss, avoid duplicate transmission, and improve communication characteristics and the utilization of functional units.
【図1】本発明の移動体通信におけるパケット通信装置
および同方式の実施形態が適用されるシステム構成図で
ある。FIG. 1 is a system configuration diagram to which an embodiment of a packet communication device and the same system in mobile communication of the present invention is applied.
【図2】移動体が基地局BS1、BS2、BS3の順に
基地局を切替ながら移動するに際し、順次接続先を切り
かえる切換手順を示した図である。FIG. 2 is a diagram showing a switching procedure for sequentially switching connection destinations when a mobile body moves while switching base stations in the order of base stations BS1, BS2, BS3.
【図3】従来の移動体通信におけるハンドオーバ・バッ
ファの重複送信手順例を示している。FIG. 3 shows an example of a duplicate transmission procedure of a handover buffer in conventional mobile communication.
10 移動体 21、22 ルータ 10 moving bodies 21, 22 router
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鄒 暁霞 神奈川県川崎市高津区坂戸3丁目2番1号 株式会社エヌイーシー情報システムズ内 Fターム(参考) 5K033 AA01 AA07 CC01 DA01 DA19 5K067 AA13 CC08 EE02 EE10 HH23 JJ39 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Zheng Xiao Xia 3-2-1 Sakado, Takatsu-ku, Kawasaki City, Kanagawa Prefecture NCI Information Systems Co., Ltd. F term (reference) 5K033 AA01 AA07 CC01 DA01 DA19 5K067 AA13 CC08 EE02 EE10 HH23 JJ39
Claims (7)
信におけるパケット通信システムにおいて、 前記移動体が基地局(BS1)とのリンク確立をした後
に受信したパケット数(n1)を記録し、 前記基地局(BS1)が前記移動体へ送信済みのパケッ
ト数を含むバイカスト通知を前記基地局(BS1)が他
の基地局(BS2)に送信し、 前記基地局(BS1)が前記移動体宛のパケットを該移
動体と前記他の基地局(BS2)の両方へ配送し、 前記基地局(BS1)から配送されて来た前記移動体宛
のパケット数(n2)を前記他の基地局(BS2)がバ
ッファに記録し、 前記基地局(BS1)から前記他の基地局(BS2)に
切替えた後に前記移動体が該他の基地局(BS2)に経
路更新通知を送信し、 前記他の基地局(BS2)はハンドオーバ用バッファか
ら最後のnパケットを取出し前記移動体へ送信し、 前記パケットロスの防止を図ったことを特徴とする移動
体通信におけるパケット通信システム。1. A packet communication system in mobile communication composed of a mobile unit and a base station, wherein the number of packets (n1) received by the mobile unit after establishing a link with a base station (BS1) is recorded. , The base station (BS1) transmits a bicast notification including the number of packets already transmitted to the mobile body to the other base station (BS2), and the base station (BS1) transmits the mobile body to the mobile body. A packet addressed to the mobile unit and the other base station (BS2), and the number of packets (n2) addressed to the mobile unit delivered from the base station (BS1) is transferred to the other base station. (BS2) records in a buffer, and after switching from the base station (BS1) to the other base station (BS2), the mobile sends a route update notification to the other base station (BS2), Base station (BS2) A packet communication system in mobile communication, wherein the last n packets are taken out from a handover buffer and transmitted to the mobile unit to prevent the packet loss.
に送信する経路更新通知には前記移動体が前記基地局
(BS1)で受信した前記パケット数(n1)を含み、 前記他の基地局(BS2)が前記パケット数(n1)と
パケット数(n2)の差“n=n2−n1”を計算し、 前記他の基地局(BS2)が前記ハンドオーバ用バッフ
ァから前記最後のnパケットを取出し、前記移動体へ送
信後に前記n個のパケットの送信完了後に、前記他の基
地局(BS2)は前記その他の基地局(BS3)へ前記
バイカスト通知を送信し、 前記他の基地局(BS2)が前記その他の基地局(BS
3)に送信する前記バイカスト通知には、前記移動体へ
送信済みのパケット数nを含み、 前記パケットロスの防止と共に移動体通信におけるハン
ドオーバ・バッファの重複送信防止を図ったことを特徴
とする請求項1記載の移動体通信におけるパケット通信
システム。2. The mobile unit is the other base station (BS2).
The route update notification transmitted to the mobile station includes the packet number (n1) received by the mobile station at the base station (BS1), and the other base station (BS2) receives the packet number (n1) and the packet number (n2). ) Difference “n = n2-n1” is calculated, and the other base station (BS2) takes out the last n packets from the handover buffer and completes transmission of the n packets after transmission to the mobile unit. Later, the other base station (BS2) transmits the bicast notification to the other base station (BS3), and the other base station (BS2) transmits the other base station (BS2).
The bicast notification to be transmitted to 3) includes the number n of packets that have been transmitted to the mobile unit, and is intended to prevent the packet loss and prevent duplicate transmission of a handover buffer in mobile communication. Item 1. A packet communication system in mobile communication according to item 1.
立をした後に受信したパケット数(n1)を記録し、 前記基地局(BS1)が前記移動体へ送信済みのパケッ
ト数を含むバイカスト通知を前記基地局(BS1)が他
の基地局(BS2)に送信し、 前記基地局(BS1)が前記移動体宛のパケットを該移
動体と前記他の基地局(BS2)の両方へ配送し、 前記基地局(BS1)から配送されて来た前記移動体宛
のパケット数(n2)を前記他の基地局(BS2)がバ
ッファに記録し、 前記基地局(BS1)から前記他の基地局(BS2)に
切替えた後に前記移動体が該他の基地局(BS2)に経
路更新通知を送信し、 前記他の基地局(BS2)はハンドオーバ用バッファか
ら最後のnパケットを取出し前記移動体へ送信し、 前記パケットロスの防止を図ったことを特徴とする移動
体通信におけるパケット通信方式。3. A bicast including the number of packets (n1) received by the mobile unit after establishing a link with the base station (BS1), and including the number of packets already transmitted to the mobile unit by the base station (BS1). The base station (BS1) sends a notification to another base station (BS2), and the base station (BS1) delivers the packet addressed to the mobile unit to both the mobile unit and the other base station (BS2). Then, the other base station (BS2) records the number of packets (n2) addressed to the mobile body delivered from the base station (BS1) in a buffer, and the base station (BS1) transfers the other base to the other base. After switching to the station (BS2), the mobile sends a route update notification to the other base station (BS2), and the other base station (BS2) extracts the last n packets from the handover buffer And send it to the A packet communication method in mobile communication, which is characterized by preventing a loss.
に送信する経路更新通知には前記移動体が前記基地局
(BS1)で受信した前記パケット数(n1)を含み、 前記他の基地局(BS2)が前記パケット数(n1)と
パケット数(n2)の差“n=n2−n1”を計算し、 前記パケットロスの防止と共に移動体通信におけるハン
ドオーバ・バッファの重複送信防止を図ったことを特徴
とする請求項3記載の移動体通信におけるパケット通信
方式。4. The mobile unit is the other base station (BS2).
The route update notification transmitted to the mobile station includes the packet number (n1) received by the mobile station at the base station (BS1), and the other base station (BS2) receives the packet number (n1) and the packet number (n2). 4. The packet communication in mobile communication according to claim 3, wherein the difference "n = n2-n1" is calculated to prevent the packet loss and the redundant transmission of the handover buffer in the mobile communication. method.
オーバ用バッファから前記最後のnパケットを取出し、
前記移動体へ送信後に前記n個のパケットの送信完了後
に、前記他の基地局(BS2)は前記その他の基地局
(BS3)へ前記バイカスト通知を送信することを特徴
とする請求項3または4記載の移動体通信におけるパケ
ット通信方式。5. The other base station (BS2) retrieves the last n packets from the handover buffer,
5. The other base station (BS2) transmits the bicast notification to the other base station (BS3) after completion of transmission of the n packets after transmission to the mobile unit. A packet communication method in the mobile communication described.
の基地局(BS3)に送信する前記バイカスト通知に
は、前記移動体へ送信済みのパケット数nを含むことを
特徴とする請求項5記載の移動体通信におけるパケット
通信方式。6. The bicast notification transmitted from the other base station (BS2) to the other base station (BS3) includes the number n of packets already transmitted to the mobile body. 5. A packet communication method in mobile communication according to item 5.
とを特徴とする請求項3から6の何れかに記載の移動体
通信におけるパケット通信方式。7. The packet communication system in mobile communication according to claim 3, wherein the packet is an IP packet.
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JP2007013463A (en) * | 2005-06-29 | 2007-01-18 | Mitsubishi Electric Corp | Handover method and mobile terminal in radio communication system |
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2002
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JP2007013463A (en) * | 2005-06-29 | 2007-01-18 | Mitsubishi Electric Corp | Handover method and mobile terminal in radio communication system |
JP4628889B2 (en) * | 2005-06-29 | 2011-02-09 | 三菱電機株式会社 | Handover method and mobile terminal of radio communication system |
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