JPH0955764A - Radio packet communication method - Google Patents
Radio packet communication methodInfo
- Publication number
- JPH0955764A JPH0955764A JP7207025A JP20702595A JPH0955764A JP H0955764 A JPH0955764 A JP H0955764A JP 7207025 A JP7207025 A JP 7207025A JP 20702595 A JP20702595 A JP 20702595A JP H0955764 A JPH0955764 A JP H0955764A
- Authority
- JP
- Japan
- Prior art keywords
- wireless
- station
- link
- packet
- packet communication
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、無線局間で、設定
されている無線リンクを通信状態に応じて開放する無線
パケット通信方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless packet communication method for releasing a set wireless link between wireless stations according to a communication state.
【０００２】[0002]
【従来の技術】図１０は、無線パケット通信システムの
構成例を示す。図において、基地局１１−１〜１１−４
は、それぞれ無線ゾーンを形成している。基地局１１−
１の無線ゾーンにいる移動局１２は、基地局１１−１を
介してネットワーク１３に接続されたパケット端末１４
と通信を行っている。本システムにおけるパケット通信
では、通信に先立ってあらかじめ移動局１２と基地局１
１−１との間でレイヤ２のＨＤＬＣ手順に基づく無線リ
ンク１５を設定し、さらに移動局１２とパケット端末１
４との間で上位レイヤのコネクション（たとえばＸ.25
レイヤ３における論理チャネル番号）１６を設定する。2. Description of the Related Art FIG. 10 shows a configuration example of a wireless packet communication system. In the figure, base stations 11-1 to 11-4
Each form a wireless zone. Base station 11-
The mobile station 12 in the wireless zone 1 is a packet terminal 14 connected to the network 13 via the base station 11-1.
Is communicating with. In the packet communication in this system, the mobile station 12 and the base station 1 are preliminarily preceded by the communication.
The radio link 15 based on the HDLC procedure of layer 2 is set between the mobile station 12 and the packet terminal 1.
4 to upper layer connection (eg X.25)
The logical channel number in layer 3) 16 is set.
【０００３】以下、パケットリンク設定方法の従来例を
示す。 ＬＡＰＤ パケットリンク設定方法の代表的なものとして、ＩＳＤ
Ｎで使用されているＬＡＰＤ（Link Access Procedure
on the D-channel）がある。この方式ではパケット通信
開始時にＳＡＢＭＥ（Set Asynchronous Balanced Mode
Extended)信号で通信を行う端末とパケット交換機等の
間にリンクを設定し、通信が終了するとＤＩＳＣ(Disco
nnect)信号でリンクを切断する。また、リンクが設定さ
れている間はリンク監視タイマが起動される。このタイ
マはパケットが送受信された時にリセットされ、タイム
オーバとなった時にリンク監視信号が送受信される。リ
ンク監視信号として、通常はＲＲ(Receive Ready) 信号
またはＲＮＲ(Receive NotReady) 信号が使用され、こ
の送受信に伴ってリンク監視タイマはリセットされる。
この結果、ＬＡＰＤではリンクが設定されている限り、
送信パケットがない場合でも一定周期でリンク監視のた
めのＲＲ信号またはＲＮＲ信号の送受信が行われる。A conventional example of a packet link setting method will be described below. As a typical LAPD packet link setting method, ISD
LAPD (Link Access Procedure) used in N
on the D-channel). In this method, SABME (Set Asynchronous Balanced Mode) is used at the start of packet communication.
A link is set up between the terminal that communicates with the Extended) signal and the packet switch, etc., and when the communication ends, DISC (Disco
nnect) signal to disconnect the link. Also, the link monitoring timer is started while the link is set. This timer is reset when a packet is transmitted / received, and a link supervisory signal is transmitted / received when the time is over. Normally, an RR (Receive Ready) signal or an RNR (Receive Not Ready) signal is used as the link monitoring signal, and the link monitoring timer is reset in accordance with this transmission / reception.
As a result, as long as the link is set in LAPD,
Even if there is no transmission packet, the RR signal or RNR signal for link monitoring is transmitted and received at a constant cycle.
【０００４】図１１は、従来のＬＡＰＤを無線リンクプ
ロトコルとして用いた場合の基地局１１と移動局１２と
の間の無線リンク制御シーケンスの例を示す。ここで
は、最初にＳＡＢＭＥ信号とＵＡ(Unnumbered Acknowle
dgement)信号のやりとりが行われ、移動局と基地局との
間に無線リンクが設定される。次に、データａとデータ
ｂのパケットがやりとりされる。ここで、データａ，デ
ータｂは上位レイヤの信号であり、ユーザパケットの場
合とコネクション制御信号の場合がある。上位レイヤコ
ネクションは、後者のコネクション制御信号を使用して
設定される。図１１では、データｂの後にデータｂの受
信確認であるＲＲ信号が送出されてから基地局がデータ
ｃを送出するまでの間、パケットの送受信が行われてい
ない。しかし、無線リンクが設定されている間は一定周
期ごとにリンク監視信号であるＲＲ信号がやりとりされ
る。FIG. 11 shows an example of a radio link control sequence between the base station 11 and the mobile station 12 when the conventional LAPD is used as a radio link protocol. Here, the SABME signal and UA (Unnumbered Acknowle
dgement) signals are exchanged to establish a wireless link between the mobile station and the base station. Next, packets of data a and data b are exchanged. Here, the data a and the data b are upper layer signals, and may be user packets or connection control signals. The upper layer connection is set up using the latter connection control signal. In FIG. 11, packets are not transmitted and received between the time when the RR signal, which is the confirmation of the reception of the data b, is transmitted after the data b and the base station transmits the data c. However, while the wireless link is set, the RR signal, which is a link monitoring signal, is exchanged at regular intervals.
【０００５】 ＣＤＰＤの無線リンク設定方法 米国で実用化されている無線パケットシステムＣＤＰＤ
（Cellular DigitalPacket Data)では、無線区間のリン
ク制御としてＬＡＰＤと同様の手順が採用されている。
したがって、端末が通信を行っている間は、送信パケッ
トがない場合でも一定周期でリンク確認のためのＲＲ信
号またはＲＮＲ信号の送受信が行われる。これにより、
端末が無線ゾーンを移行した場合でも、ルータは端末か
ら周期的に送信されるＲＲ／ＲＮＲ信号により端末の存
在する無線ゾーンを把握することができ、自動的にハン
ドオーバと同等の処理がなされることになる。Radio link setting method of CDPD Radio packet system CDPD put to practical use in the United States
In (Cellular Digital Packet Data), a procedure similar to that of LAPD is adopted for link control in the wireless section.
Therefore, while the terminal is communicating, the RR signal or the RNR signal for link confirmation is transmitted / received at a constant cycle even if there is no transmission packet. This allows
Even when the terminal moves to the wireless zone, the router can grasp the wireless zone in which the terminal exists by the RR / RNR signal periodically transmitted from the terminal, and the processing equivalent to the handover is automatically performed. become.
【０００６】 テレターミナルの無線パケット通信切
断方法 テレターミナルシステムでは、Ｘ.25 によるコネクショ
ン型パケット通信が行われている。このシステムでは、
パケットが送受信されなくなってから約５分経過した場
合には、強制的にそのコネクションの切断が行われる。Radio Packet Communication Disconnection Method of Teleterminal In the teleterminal system, connection type packet communication by X.25 is performed. In this system,
When about 5 minutes have passed since the packet was not transmitted / received, the connection is forcibly disconnected.
【０００７】[0007]
【発明が解決しようとする課題】移動端末では電源とし
てバッテリーが使用されており、バッテリーセービング
は重要な課題になっている。ところで、上述した，
の従来方法では送信データの有無に関わらず、無線リン
クの監視のために一定時間（無線リンク監視周期）ごと
に送信と受信を行わなければならない。したがって、送
信データがない場合には無駄な電力を消費し続けること
になる。また、送信データがないにも関わらず電波を使
用することになり、無線リソース（電波）の有効利用の
面で不利であった。A battery is used as a power source in a mobile terminal, and battery saving has become an important issue. By the way, as mentioned above,
In the conventional method, regardless of the presence or absence of transmission data, it is necessary to perform transmission and reception at fixed time intervals (radio link monitoring cycle) for monitoring the radio link. Therefore, when there is no transmission data, useless power is continuously consumed. In addition, even though there is no transmission data, radio waves are used, which is disadvantageous in terms of effective use of radio resources (radio waves).
【０００８】一方、上述したの従来方法では、無通信
状態が一定時間続いたときにコネクションを開放して通
信を強制的に切断することによりこの問題を解決しよう
としている。しかし、一旦コネクションを開放すると再
発呼処理が必要となり、使い勝手およびパケット遅延の
面で不利であった。本発明は、無通信時の無駄なリンク
監視信号の送受信を停止して消費電力の低減を図るとと
もに、無線リソースの無効使用を削減する無線パケット
通信方法を提供することを目的とする。On the other hand, the above-mentioned conventional method attempts to solve this problem by opening the connection and forcibly disconnecting the communication when the non-communication state continues for a certain time. However, once the connection is released, call recall processing is required, which is disadvantageous in terms of usability and packet delay. It is an object of the present invention to provide a wireless packet communication method that stops unnecessary transmission and reception of link supervisory signals during non-communication to reduce power consumption and reduces invalid use of wireless resources.
【０００９】[0009]
【課題を解決するための手段】本発明の無線パケット通
信方法では、パケットの送受信を頻繁に行っている通信
状態と、パケットの送受信を所定の期間行っていない無
通信状態とに分ける。通信状態では、無線局Ａと無線局
Ｂとの間で従来と同様に、無線リンク監視周期ごとにリ
ンク監視信号をやりとりする。無通信状態では、無線局
Ａと無線局Ｂとの間で無線リンクを一時的に開放してリ
ンク監視信号のやりとりを停止し（請求項１）、または
無線リンク監視周期を長くしてリンク監視信号のやりと
りを減らす（請求項２）。According to the wireless packet communication method of the present invention, a communication state in which packets are frequently transmitted and received and a non-communication state in which packets are not transmitted and received for a predetermined period are divided. In the communication state, the link monitoring signal is exchanged between the wireless station A and the wireless station B in each wireless link monitoring cycle as in the conventional case. In the non-communication state, the wireless link is temporarily opened between the wireless station A and the wireless station B to stop the exchange of the link monitoring signal (Claim 1), or the wireless link monitoring cycle is lengthened to perform the link monitoring. Signal exchange is reduced (claim 2).
【００１０】また、基地局と移動局との間で無線リンク
が開放された状態では、各基地局からの報知信号の受信
によって移動局が他の基地局が形成する無線ゾーンに移
行したことを認識してハンドオーバを行う（請求項
３）。また、パケット送受の要求が生じたときには、ハ
ンドオーバ先の基地局と移動局との間に無線リンクを設
定する。Further, in the state where the radio link is opened between the base station and the mobile station, it is possible to confirm that the mobile station has moved to the radio zone formed by another base station by receiving the notification signal from each base station. Recognize and perform the handover (claim 3). When a packet transmission / reception request is made, a wireless link is set up between the handover destination base station and the mobile station.
【００１１】また、基地局と移動局との間の無線リンク
が開放されているか否か（請求項１）、または無線リン
ク監視周期が長くなっているか否か（請求項２）に応じ
て、移動局間または移動局とパケット端末との間に設定
されるコネクションを切断する強制切断時間を変化させ
る（請求項４）。コネクションの強制切断時間を調整す
ることにより、ユーザ側の要求により無線リンクが開放
されなかったり無線リンク監視周期が長くならなくて
も、強制的に無線リソースの無効使用を解消できる。Further, depending on whether the radio link between the base station and the mobile station is open (claim 1) or whether the radio link monitoring period is long (claim 2). The forced disconnection time for disconnecting the connection set between the mobile stations or between the mobile station and the packet terminal is changed (claim 4). By adjusting the forced disconnection time of the connection, the invalid use of the wireless resource can be forcibly canceled even if the wireless link is not released or the wireless link monitoring cycle does not become long due to the request from the user.
【００１２】[0012]
（請求項１の実施形態）図１は、請求項１の無線パケッ
ト通信方法における無線リンクと上位レイヤのコネクシ
ョンとの関係を示す。請求項１の無線パケット通信方法
では、無通信状態のときに、上位レイヤのコネクション
を確立したまま無線リンクを開放することを特徴とす
る。図１に示すように、上位レイヤのコネクションは常
に設定された状態にあるのに対して、無線リンクはパケ
ットの発生に応じて断続的に設定および開放が繰り返さ
れる。(Embodiment of claim 1) FIG. 1 shows a relationship between a wireless link and a connection of an upper layer in the wireless packet communication method of claim 1. The wireless packet communication method according to claim 1 is characterized in that, in the non-communication state, the wireless link is released while the upper layer connection is established. As shown in FIG. 1, the upper layer connection is always set, whereas the wireless link is intermittently set and released in response to the occurrence of a packet.
【００１３】図２は、請求項１の無線パケット通信方法
の無線リンク制御シーケンスを示す。図において、基地
局と移動局との間で、ＳＡＢＭＥ信号およびＵＡ信号の
やりとりによる無線リンクの設定、データａ，ｂのやり
とり、その後のＲＲ信号による受信確認までは従来例と
同様である。ここでは、所定の期間にパケットの送受信
がないときに無通信状態と判断し、ＤＩＳＣ信号および
ＵＡ信号をやりとりして無線リンクを開放する。これに
より、従来のＬＡＰＤのようなリンク監視信号のやりと
りがなくなる。このとき、上位レイヤのコネクションは
切断しないので、その後パケット送受の要求が生じたと
きには、ＳＡＢＭＥ信号およびＵＡ信号をやりとりして
無線リンクを設定状態に戻すだけで、通信を継続するこ
とができる。図では、その後データｃ，ｄをやりとり
し、ＲＲ信号による受信確認を行っている。FIG. 2 shows a radio link control sequence of the radio packet communication method of claim 1. In the figure, the setting of the wireless link by the exchange of the SABME signal and the UA signal, the exchange of the data a and b, and the subsequent reception confirmation by the RR signal between the base station and the mobile station are the same as in the conventional example. Here, when there is no packet transmission / reception for a predetermined period, it is determined that there is no communication, and the DISC signal and the UA signal are exchanged to open the wireless link. This eliminates the exchange of link supervisory signals as in the conventional LAPD. At this time, the connection of the upper layer is not disconnected, so that when a packet transmission / reception request subsequently occurs, communication can be continued simply by exchanging the SABME signal and the UA signal and returning the wireless link to the set state. In the figure, after that, the data c and d are exchanged to confirm the reception by the RR signal.
【００１４】（請求項２の実施形態）請求項２の無線パ
ケット通信方法では、無通信状態のときに、無線リンク
監視周期を長くすることを特徴とする。図３は、請求項
２の無線パケット通信方法の無線リンク制御シーケンス
を示す。(Embodiment 2) The wireless packet communication method according to claim 2 is characterized in that the wireless link monitoring period is lengthened in the non-communication state. FIG. 3 shows a wireless link control sequence of a wireless packet communication method according to claim 2.
【００１５】図において、基地局と移動局との間で、Ｓ
ＡＢＭＥ信号およびＵＡ信号のやりとりによる無線リン
クの設定、データａ，ｂのやりとり、その後のＲＲ信号
による受信確認までは従来例と同様である。ここでは、
所定の期間にパケットの送受信がないときに無通信状態
と判断し、ＬＣ（リンク制御）信号およびＵＡ信号をや
りとりして無線リンク監視周期を長くする。これによ
り、リンク監視を行うＲＲ信号のやりとりの間隔が広が
り、リンク監視回数を減らすことができる。また、この
とき無線リンク監視周期を無限大に設定すると、リンク
監視は行われないことになる。その後、データｃ，ｄの
やりとりが行われた場合には、無線リンク監視周期をも
とに戻す。In the figure, between the base station and the mobile station, S
The setting of the wireless link by the exchange of the ABME signal and the UA signal, the exchange of the data a and b, and the subsequent reception confirmation by the RR signal are the same as in the conventional example. here,
When there is no packet transmission / reception within a predetermined period, it is determined that there is no communication, and LC (link control) signals and UA signals are exchanged to lengthen the wireless link monitoring cycle. As a result, the interval of RR signal exchange for link monitoring is widened, and the number of times of link monitoring can be reduced. If the wireless link monitoring cycle is set to infinity at this time, link monitoring will not be performed. After that, when the data c and d are exchanged, the wireless link monitoring cycle is restored.
【００１６】（請求項３の実施形態）請求項３の無線パ
ケット通信方法では、基地局と移動局との間で無線リン
クが開放されている期間でも、移動局が他の基地局の無
線ゾーンに移行したときにはハンドオーバを行うことを
特徴とする。図４は、請求項３の無線パケット通信方法
の無線リンク制御シーケンスを示す。(Embodiment 3) In the wireless packet communication method according to claim 3, the mobile station is in the wireless zone of another base station even during the period when the wireless link between the base station and the mobile station is open. It is characterized in that a handover is performed when the process shifts to. FIG. 4 shows a wireless link control sequence of the wireless packet communication method of claim 3.
【００１７】図において、移動局は、基地局♯１および
基地局♯２から報知信号を間欠受信することにより、自
局が基地局♯１の無線ゾーンから基地局♯２の無線ゾー
ンへ移動したことを認識し、ハンドオーバを起動する。
これにより、移動局と基地局♯２との間で、ＳＡＢＭＥ
信号およびＵＡ信号のやりとりにより無線リンクを設定
する。次に、ハンドオーバ要求信号およびハンドオーバ
受付信号をやりとりし、ＤＩＳＣ信号およびＵＡ信号を
やりとりして無線リンクを開放する。このとき、上位レ
イヤのコネクションは影響を受けないので、パケット送
受の要求が生じたときには、ＳＡＢＭＥ信号およびＵＡ
信号をやりとりして無線リンクを設定状態に戻すだけ
で、通信を継続することができる。図では、その後デー
タｃ，ｄをやりとりし、ＲＲ信号による受信確認を行っ
ている。In the figure, the mobile station moves from the radio zone of base station # 1 to the radio zone of base station # 2 by intermittently receiving a broadcast signal from base station # 1 and base station # 2. Recognize this, and activate handover.
This allows SABME between the mobile station and the base station # 2.
A wireless link is established by exchanging signals and UA signals. Next, the handover request signal and the handover acceptance signal are exchanged, and the DISC signal and the UA signal are exchanged to release the wireless link. At this time, since the connection of the upper layer is not affected, when a request for packet transmission / reception occurs, the SABME signal and the UA
Communication can be continued simply by exchanging signals and returning the wireless link to the set state. In the figure, after that, the data c and d are exchanged to confirm the reception by the RR signal.
【００１８】（請求項４の実施形態）図５は、請求項４
の無線パケット通信方法における無線リンクと上位レイ
ヤのコネクションとの関係を示す。請求項４の無線パケ
ット通信方法では、基地局と移動局との間の無線リンク
が開放されているか否か、または無線リンク監視周期が
長くなっているか否かに応じて、強制切断時間を変化さ
せることを特徴とする。図５(a) に示すように、無線リ
ンクの一時開放が行われなかった場合には、無線リソー
スが無効に使用され続けるので、直前のパケットが送受
信された時点０から所定の強制切断時間Ｔ2が経過後
に、無線リンクを開放し上位レイヤのコネクションを切
断する。(Embodiment of Claim 4) FIG.
3 shows the relationship between the wireless link and the upper layer connection in the wireless packet communication method of FIG. In the wireless packet communication method according to claim 4, the forced disconnection time is changed according to whether the wireless link between the base station and the mobile station is open or whether the wireless link monitoring cycle is long. It is characterized by As shown in FIG. 5 (a), if the wireless link is not temporarily released, the wireless resource continues to be used ineffectively, so a predetermined forced disconnection time T2 from the time 0 when the immediately preceding packet is transmitted and received. After that, the wireless link is released and the upper layer connection is disconnected.
【００１９】一方、図５(b) に示すように、請求項１の
無線パケット通信方法により、時間Ｔ1 (＜Ｔ2）で無線
リンクが一時開放された場合には、無線リソースの無効
使用が防止されるので、強制切断時間を延長し、時間Ｔ
3 (＞Ｔ2）までコネクションを維持して網内リソースの
占有を許容する。なお、時刻Ｔ3 までの間にパケットの
送受信を行うときには、無線リンクの再設定するだけで
通信が再開できる。On the other hand, as shown in FIG. 5B, according to the wireless packet communication method of claim 1, when the wireless link is temporarily released at time T1 (<T2), invalid use of the wireless resource is prevented. Therefore, the forced disconnection time is extended to the time T
The connection is maintained up to 3 (> T2) and the occupation of resources in the network is permitted. When packets are transmitted and received by the time T3, communication can be resumed simply by resetting the wireless link.
【００２０】[0020]
（請求項１，４の実施例）図６は、請求項１，４の無線
パケット通信方法における移動局の制御手順を示す。図
において、通信開始(a1)に伴って無線リンクを設定し(a
2)、次に上位レイヤのコネクションを確立し(a3)、リン
ク監視タイマをスタートさせる(a4)。その後、パケット
が送受信され(a5-yes)、それが上位レイヤのコネクショ
ン切断パケットでないときに(a6-no) 、リンク監視タイ
マをリセットする(a7)。一方、基地局から上位レイヤの
コネクション切断パケットが受信された場合(a6-yes)、
またはリンク監視タイマがタイムアウトするまでの間に
通信を終了する場合は (a5-no,a8-no,a9-yes) 、上位レ
イヤのコネクションを切断し(a10) 、無線リンクを開放
して(a11) 通信を終了する(a12) 。(Embodiments of claims 1 and 4) FIG. 6 shows a control procedure of a mobile station in the wireless packet communication method of claims 1 and 4. In the figure, the wireless link is set (a1
2) Then, the connection of the upper layer is established (a3) and the link monitoring timer is started (a4). After that, the packet is transmitted and received (a5-yes), and when it is not the connection disconnection packet of the upper layer (a6-no), the link monitoring timer is reset (a7). On the other hand, when the upper layer connection disconnection packet is received from the base station (a6-yes),
Or, if communication is terminated before the link monitoring timer times out (a5-no, a8-no, a9-yes), disconnect the upper layer connection (a10) and release the wireless link (a11 ) Terminate communication (a12).
【００２１】また、送受信されるパケットがなく、リン
ク監視タイマがタイムアウトすると(a8-yes)、無線リン
クを開放する(a13) 。その後、パケット送受信の要求が
生じた場合には(a14-yes) 、無線リンクを再設定し(a1
5) 、パケットの送受信を行うとともに(a16) 、リンク
監視タイマをリセットする(a6)。図７は、請求項１，４
の無線パケット通信方法における基地局の制御手順を示
す。When there is no packet to be transmitted and received and the link monitoring timer times out (a8-yes), the wireless link is released (a13). After that, if a packet transmission / reception request occurs (a14-yes), the wireless link is reconfigured (a1
5) Sending and receiving packets (a16) and resetting the link monitoring timer (a6). FIG. 7 shows claims 1 and 4.
The control procedure of the base station in the wireless packet communication method is described.
【００２２】図において、通信開始(b1)に伴って無線リ
ンクを設定し(b2)、次に上位レイヤのコネクションを確
立し(b3)、リンク監視タイマをスタートさせる(b4)。そ
の後、通信している移動局とパケットを送受信し(b5-ye
s)、それが通信終了パケットまたはＤＩＳＣ信号でない
ときに(b6-no,b7-no) 、リンク監視タイマをリセットす
る(b8)。ここで、タイマ値がＴ2 （図５参照）を越えた
場合(b5-no,b9-yes)、または通信が終了する場合は(b5-
yes,b6-yes) 、上位レイヤのコネクションを切断し(b1
0) 、無線リンクを開放して(b11) 通信を終了する(b12)
。In the figure, a radio link is set (b2) along with the start of communication (b1), then a connection of an upper layer is established (b3), and a link monitoring timer is started (b4). After that, it sends and receives packets to and from the communicating mobile station (b5-yes
s), when it is not a communication end packet or a DISC signal (b6-no, b7-no), the link monitoring timer is reset (b8). Here, if the timer value exceeds T2 (see Fig. 5) (b5-no, b9-yes), or if the communication ends (b5-no
yes, b6-yes) to disconnect the upper layer connection (b1
0), releases the wireless link (b11) and terminates communication (b12)
.
【００２３】また、通信終了でないにもかかわらず(b6-
no) 移動局からＤＩＳＣ信号（図２参照）が送信された
場合は(b7-yes)、無線リンクを開放する(b13) 。その
後、タイマ値がＴ3 （図５参照）を越えた場合(b14-ye
s) は、一旦無線リンクを設定し(b15) 、上位レイヤの
コネクションを切断した後に(b10) 、無線リンクを開放
して(b11) 通信を終了する(b12) 。Further, although the communication is not completed (b6-
no) When the DISC signal (see FIG. 2) is transmitted from the mobile station (b7-yes), the wireless link is released (b13). After that, if the timer value exceeds T3 (see Fig. 5) (b14-yes
s) once establishes a wireless link (b15), disconnects the upper layer connection (b10), releases the wireless link (b11), and terminates communication (b12).
【００２４】また、タイマ値がＴ3 を越える前に(b14-n
o)、パケットの送受信の要求が発生した場合は(b16-ye
s) 、無線リンクを再設定し(b17) 、パケットの送受信
を行うとともに(b18) 、リンク監視タイマをリセットす
る(b19-no,b8) 。ここで、通信終了の場合には(b19-ye
s) 、上位レイヤのコネクションを切断し(b10) 、無線
リンクを開放して(b11) 通信を終了する(b12) 。Before the timer value exceeds T3 (b14-n
o), if a request to send or receive a packet occurs (b16-ye
s) Reconfigure the wireless link (b17), send and receive packets (b18), and reset the link monitoring timer (b19-no, b8). Here, if the communication ends, (b19-ye
s), disconnect the upper layer connection (b10), open the wireless link (b11) and terminate the communication (b12).
【００２５】（請求項２の実施例）図８は、請求項２の
無線パケット通信方法における移動局の制御手順を示
す。移動局の制御手順は、図６に示す請求項１，４の無
線パケット通信方法におけるものとほぼ同じである。図
６では、リンク監視タイマのタイムアウト時に無線リン
クを開放していたが(a13) 、ここではＬＣ信号（図３参
照）を送信して(c1)無線リンク監視周期を長くする(c
2)。その後、リンク監視信号（ＲＲ信号）以外のパケッ
ト送受信の要求が生じた場合には(c3-yes,c4-no)、無線
リンク監視周期をもとに戻し(c5)、パケットの送受信を
行うとともに(a16) 、リンク監視タイマをリセットする
(a6)。(Embodiment of claim 2) FIG. 8 shows a control procedure of a mobile station in the wireless packet communication method of claim 2. The control procedure of the mobile station is almost the same as that in the wireless packet communication method according to claims 1 and 4 shown in FIG. In FIG. 6, the wireless link is released when the link monitoring timer times out (a13), but here, the LC signal (see FIG. 3) is transmitted (c1) to lengthen the wireless link monitoring period (c
2). After that, when a request for packet transmission / reception other than the link supervisory signal (RR signal) occurs (c3-yes, c4-no), the wireless link supervisory cycle is restored (c5), and packet transmission / reception is performed. (a16), reset the link monitoring timer
(a6).
【００２６】（請求項３の実施例）図９は、請求項３の
無線パケット通信方法における移動局のハンドオーバ制
御手順を示す。図において、移動局ではハンドオーバが
起動されると(d1)、現在の通信状態を判断し(d2)、無線
リンク開放中であればＡ＝１を設定し(d3)、無線リンク
設定中であればＡ＝０を設定する(d4)。次に、移動先の
基地局に対して無線リンクを設定し(d5)、ハンドオーバ
要求信号を送信する(d6)。これに対するハンドオーバ受
付信号を受信した後に(d7)、Ａ＝１、すなわち無線リン
ク開放中のハンドオーバの場合には(d8-yes)、無線リン
クを切断して(d9)終了する(d10) 。また、Ａ＝０、すな
わち無線リンク設定中のハンドオーバの場合には(d8-n
o) 、そのまま終了する(d10) 。このとき、移動先の基
地局は、移動元の基地局から移動局に関するリンク監視
タイマのタイマ値を引き継ぐものとする。(Embodiment of claim 3) FIG. 9 shows a handover control procedure of a mobile station in the radio packet communication method of claim 3. In the figure, when a mobile station initiates a handover (d1), it determines the current communication state (d2). If the radio link is open, A = 1 is set (d3). For example, A = 0 is set (d4). Next, a wireless link is set up with respect to the movement-destination base station (d5), and a handover request signal is transmitted (d6). After receiving the handover acceptance signal for this (d7), if A = 1, that is, in the case of a handover during the release of the wireless link (d8-yes), the wireless link is disconnected (d9) and the processing ends (d10). Further, in the case of A = 0, that is, in the case of a handover during the setting of the wireless link, (d8-n
o), and end as it is (d10). At this time, the movement-destination base station takes over the timer value of the link monitoring timer for the mobile station from the movement-source base station.
【００２７】[0027]
【発明の効果】以上説明したように、本発明の無線パケ
ット通信方法では、通信状態（パケットの送受信を頻繁
に行っている状態）のときは従来と同様のリンク監視が
行われ、無通信状態（パケットの送受信を長時間行って
いない状態）のときは無駄なリンク監視信号の送受信を
停止し、またはその無線リンク監視周期を長くする。こ
れにより、リンク監視信号のやりとりに伴う無線局の消
費電力を低減でき、かつ無線リソースの無効使用を削減
でき、周波数利用効率を高めることができる。また、網
側からみれば、リンクで使用される多重識別子が無通信
時に解放されることから、多重識別子の効率的な再利用
が可能となり、少ないビットで多重識別子を構成するこ
とができる。As described above, in the wireless packet communication method of the present invention, when the communication state (the state where packets are frequently transmitted and received) is performed, the same link monitoring as in the conventional case is performed and the non-communication state is established. When the packet is not transmitted / received for a long time, useless transmission / reception of the link supervisory signal is stopped or the wireless link supervisory period is lengthened. By this means, it is possible to reduce the power consumption of the wireless station due to the exchange of link supervisory signals, reduce the invalid use of wireless resources, and improve the frequency utilization efficiency. Further, from the network side, since the multiplex identifier used in the link is released during no communication, the multiplex identifier can be efficiently reused and the multiplex identifier can be configured with a small number of bits.
【００２８】また、無線リンクが開放されているときで
もハンドオーバを行うことにより、網側は移動局の所属
する基地局を認識し、移動先の基地局を介してパケット
通信を継続することができる。また、無線リンクが開放
されてコネクションが維持される場合でも、コネクショ
ンの強制切断を可能にすることにより、コネクションを
最大限維持してユーザの使い勝手を保証しながら網内リ
ソースの占有を解消できる。By performing a handover even when the wireless link is open, the network side can recognize the base station to which the mobile station belongs and continue the packet communication through the destination base station. . Further, even when the wireless link is released and the connection is maintained, by forcibly disconnecting the connection, it is possible to eliminate the occupation of resources in the network while maintaining the maximum connection and guaranteeing the user's usability.
【図１】請求項１の無線パケット通信方法における無線
リンクと上位レイヤのコネクションとの関係を示す図。FIG. 1 is a diagram showing a relationship between a wireless link and a higher layer connection in the wireless packet communication method according to claim 1.
【図２】請求項１の無線パケット通信方法の無線リンク
制御シーケンスを示す図。FIG. 2 is a diagram showing a wireless link control sequence of the wireless packet communication method according to claim 1;
【図３】請求項２の無線パケット通信方法の無線リンク
制御シーケンスを示す図。FIG. 3 is a diagram showing a wireless link control sequence of the wireless packet communication method of claim 2;
【図４】請求項３の無線パケット通信方法の無線リンク
制御シーケンスを示す図。FIG. 4 is a diagram showing a wireless link control sequence of the wireless packet communication method of claim 3;
【図５】請求項４の無線パケット通信方法における無線
リンクと上位レイヤのコネクションとの関係を示す図。FIG. 5 is a diagram showing a relationship between a wireless link and an upper layer connection in the wireless packet communication method according to claim 4;
【図６】請求項１，４の無線パケット通信方法における
移動局の制御手順を示すフローチャート。FIG. 6 is a flowchart showing a control procedure of a mobile station in the wireless packet communication method according to any one of claims 1 and 4.
【図７】請求項１，４の無線パケット通信方法における
基地局の制御手順を示すフローチャート。FIG. 7 is a flowchart showing a control procedure of a base station in the wireless packet communication method according to any one of claims 1 and 4.
【図８】請求項２の無線パケット通信方法における移動
局の制御手順を示すフローチャート。FIG. 8 is a flowchart showing a control procedure of a mobile station in the wireless packet communication method according to claim 2.
【図９】請求項３の無線パケット通信方法における移動
局のハンドオーバ制御手順を示すフローチャート。FIG. 9 is a flowchart showing a handover control procedure of a mobile station in the wireless packet communication method according to claim 3;
【図１０】無線パケット通信システムの構成例を示す
図。FIG. 10 is a diagram showing a configuration example of a wireless packet communication system.
【図１１】従来のＬＡＰＤを無線リンクプロトコルとし
て用いた場合の基地局１１と移動局１２との間の無線リ
ンク制御シーケンスの例を示す図。FIG. 11 is a diagram showing an example of a radio link control sequence between a base station 11 and a mobile station 12 when a conventional LAPD is used as a radio link protocol.
【符号の説明】 １１ 基地局 １２ 移動局 １３ ネットワーク １４ パケット端末 １５ 無線リンク １６ 上位レイヤのコネクション[Explanation of Codes] 11 base station 12 mobile station 13 network 14 packet terminal 15 wireless link 16 upper layer connection
───────────────────────────────────────────────────── フロントページの続き (72)発明者 清水 力 東京都千代田区内幸町１丁目１番６号 日 本電信電話株式会社内 (72)発明者 塩澤 慶一 東京都千代田区内幸町１丁目１番６号 日 本電信電話株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Riki Shimizu 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Keiichi Shiozawa 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation
Claims (4)
う際は無線局Ａと無線局Ｂとの間で無線リンクを設定し
てからパケット通信を行い、パケット通信を終了する際
は無線局Ａと無線局Ｂとの間で無線リンクを開放し、 前記無線リンクが設定状態にあり、所定の無線リンク監
視周期内に前記無線局Ａと前記無線局Ｂとの間でパケッ
トの送受信がないときに、前記無線局Ａおよび前記無線
局Ｂが互いに無線リンク監視信号をやりとりする無線パ
ケット通信方法において、 前記無線局Ａと前記無線局Ｂとの間で所定の期間にパケ
ットの送受信がないとき、または前記無線局Ａと前記無
線局Ｂの少なくとも一方から前記無線リンク開放の要求
があったときに、前記無線リンクを一時的に開放し、 前記無線リンクの開放後に、前記無線局Ａと前記無線局
Ｂとの間でパケット送受の要求が生じたときには、再び
前記無線リンクを設定状態に戻してパケット通信を継続
することを特徴とする無線パケット通信方法。1. When the wireless stations A and B perform packet communication, a wireless link is set up between the wireless stations A and B before packet communication is performed, and when the packet communication is terminated, wireless communication is performed. A wireless link is released between the station A and the wireless station B, the wireless link is in a setting state, and packets are transmitted and received between the wireless station A and the wireless station B within a predetermined wireless link monitoring period. In the wireless packet communication method in which the wireless station A and the wireless station B exchange wireless link monitoring signals with each other when there is no packet, there is no packet transmission / reception between the wireless station A and the wireless station B in a predetermined period. When, or when there is a request to release the wireless link from at least one of the wireless station A and the wireless station B, the wireless link is temporarily released, and after the wireless link is released, the wireless station A and None A wireless packet communication method characterized in that, when a packet transmission / reception request is made with the line station B, the wireless link is returned to the set state again and packet communication is continued.
う際は無線局Ａと無線局Ｂとの間で無線リンクを設定し
てからパケット通信を行い、パケット通信を終了する際
は無線局Ａと無線局Ｂとの間で無線リンクを開放し、 前記無線リンクが設定状態にあり、所定の無線リンク監
視周期内に前記無線局Ａと前記無線局Ｂとの間でパケッ
トの送受信がないときに、前記無線局Ａおよび前記無線
局Ｂが互いに無線リンク監視信号をやりとりする無線パ
ケット通信方法において、 前記無線局Ａと前記無線局Ｂとの間で所定の期間にパケ
ットの送受信がないとき、または前記無線局Ａと前記無
線局Ｂの少なくとも一方から前記無線リンク監視周期の
延長要求があったときに、前記無線リンク監視周期を長
くし、 前記無線局Ａと前記無線局Ｂとの間でパケットの送受信
が再開されたときには前記無線リンク監視周期を短くす
ることを特徴とする無線パケット通信方法。2. When the wireless station A and the wireless station B perform packet communication, a wireless link is set up between the wireless station A and the wireless station B and then packet communication is performed, and when the packet communication is terminated, the wireless communication is performed. A wireless link is released between the station A and the wireless station B, the wireless link is in a setting state, and packets are transmitted and received between the wireless station A and the wireless station B within a predetermined wireless link monitoring period. In the wireless packet communication method in which the wireless station A and the wireless station B exchange wireless link monitoring signals with each other when there is no packet, there is no packet transmission / reception between the wireless station A and the wireless station B in a predetermined period. When, or when there is a request for extension of the wireless link monitoring cycle from at least one of the wireless station A and the wireless station B, the wireless link monitoring cycle is lengthened, and the wireless station A and the wireless station B are In between A wireless packet communication method, characterized in that the wireless link monitoring cycle is shortened when transmission / reception of packets is restarted.
は基地局と移動局との間で無線リンクを設定してからパ
ケット通信を行い、パケット通信を終了する際は基地局
と移動局との間で無線リンクを開放し、 前記無線リンクが設定状態にあり、所定の無線リンク監
視周期内に前記基地局と前記移動局との間でパケットの
送受信がないときに、前記基地局および前記移動局が互
いに無線リンク監視信号をやりとりし、 パケット通信中の移動局が他の基地局が形成する無線ゾ
ーンに移行したときにハンドオーバを行う無線パケット
通信方法において、 前記基地局と前記移動局との間で所定の期間にパケット
の送受信がないとき、または前記基地局と前記移動局の
少なくとも一方から前記無線リンク開放の要求があった
ときに、前記無線リンクを一時的に開放するとともに、
その状態で各基地局からの報知信号の受信によって前記
移動局が他の基地局が形成する無線ゾーンに移行したこ
とを認識したときにハンドオーバを行い、 ハンドオーバ先の基地局と前記移動局との間でパケット
送受の要求が生じたときには、その間で無線リンクを設
定状態に戻してパケット通信を継続することを特徴とす
る無線パケット通信方法。3. When a base station and a mobile station perform packet communication, a radio link is set up between the base station and the mobile station before packet communication, and when the packet communication ends, the base station and mobile station. A radio link is released between the base station and the mobile station when the radio link is in a setting state, and there is no packet transmission / reception between the base station and the mobile station within a predetermined radio link monitoring period. A radio packet communication method in which the mobile stations exchange radio link supervisory signals with each other and perform handover when a mobile station in packet communication moves to a radio zone formed by another base station, wherein the base station and the mobile station When there is no packet transmission / reception between the mobile station and the mobile station or when there is a request to release the radio link from at least one of the base station and the mobile station, the wireless link is released. With the occasional release,
In that state, when the mobile station recognizes that the mobile station has moved to a wireless zone formed by another base station by receiving a notification signal from each base station, a handover is performed, and the handover destination base station and the mobile station A wireless packet communication method characterized in that, when a packet transmission / reception request is made between them, the wireless link is returned to the set state and packet communication is continued during the request.
基地局およびパケット端末と複数の移動局とにより構成
され、基地局を介して移動局間または移動局とパケット
端末との間でパケット通信を行う際は、あらかじめ基地
局と移動局との間で無線リンクを設定し、かつ移動局間
または移動局とパケット端末との間で論理的なコネクシ
ョンを設定してから通信を行うコネクション型パケット
通信であり、 前記無線リンクが設定状態にあり、所定の無線リンク監
視周期内に前記基地局と前記移動局との間でパケットの
送受信がないときに、前記基地局および前記移動局が互
いに無線リンク監視信号をやりとりし、さらに所定の強
制切断時間内に前記基地局と前記移動局との間でパケッ
トの送受信がないときに前記コネクションを強制切断す
る無線パケット通信方法において、 請求項１または請求項２に記載の無線パケット通信方法
により、前記基地局と前記移動局との間の無線リンクが
開放されているか否か、または前記無線リンク監視周期
が長くなっているか否かに応じて、前記強制切断時間を
変化させることを特徴とする無線パケット通信方法。4. A plurality of base stations and packet terminals connected via a network, and a plurality of mobile stations, and packet communication between mobile stations or between a mobile station and a packet terminal via the base station. Connection-based packet communication in which a wireless link is set up in advance between the base station and the mobile station, and a logical connection is set between the mobile stations or between the mobile station and the packet terminal before communication. The wireless link is in a set state, and when there is no packet transmission / reception between the base station and the mobile station within a predetermined wireless link monitoring period, the base station and the mobile station wirelessly link with each other. Forced disconnection by exchanging a supervisory signal and forcibly disconnecting the connection when there is no packet transmission / reception between the base station and the mobile station within a predetermined forced disconnection time. In the packet communication method, whether or not the wireless link between the base station and the mobile station is opened by the wireless packet communication method according to claim 1 or the wireless link monitoring cycle is long. The wireless packet communication method is characterized in that the forced disconnection time is changed depending on whether or not
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7207025A JPH0955764A (en) | 1995-08-14 | 1995-08-14 | Radio packet communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7207025A JPH0955764A (en) | 1995-08-14 | 1995-08-14 | Radio packet communication method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0955764A true JPH0955764A (en) | 1997-02-25 |
Family
ID=16532965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7207025A Pending JPH0955764A (en) | 1995-08-14 | 1995-08-14 | Radio packet communication method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0955764A (en) |
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