JP2000358268A - Zone roaming control method - Google Patents
Zone roaming control methodInfo
- Publication number
- JP2000358268A JP2000358268A JP11168976A JP16897699A JP2000358268A JP 2000358268 A JP2000358268 A JP 2000358268A JP 11168976 A JP11168976 A JP 11168976A JP 16897699 A JP16897699 A JP 16897699A JP 2000358268 A JP2000358268 A JP 2000358268A
- Authority
- JP
- Japan
- Prior art keywords
- reception
- zone
- mobile station
- signal
- control method
- 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.)
- Granted
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
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はゾーン移行制御方法
に係り、特に携帯電話などの移動通信方式において待ち
受け中の移動局が複数の基地局からの制御チャネルデー
タを間欠受信し、受信結果に基づいて待ち受け先ゾーン
に移行するゾーン移行制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zone transfer control method, and more particularly to a mobile station waiting in a mobile communication system such as a portable telephone, intermittently receiving control channel data from a plurality of base stations, and based on the reception result. And a zone transfer control method for transferring to a standby zone.
【０００２】[0002]
【従来の技術】移動局は現に在圏しているゾーンの制御
チャネルを常時受信し、基地局からの着呼信号を待ち受
けていると同時に、その在圏ゾーンの周辺ゾーンの制御
チャネルの各受信レベルと待ち受け中の制御チャネルの
受信レベルとを繰り返し測定し比較を行っている。2. Description of the Related Art A mobile station constantly receives a control channel of a zone in which the mobile station is currently located, waits for an incoming call signal from a base station, and simultaneously receives control channels in zones surrounding the zone in which the mobile station is located. The level and the reception level of the waiting control channel are repeatedly measured and compared.
【０００３】図２は従来の着信待ち状態の移動端末と基
地局の制御チャネル信号との関係を示す図である。基地
局の制御用スロットは連続する４スロット（＃１〜＃４
スロット、１スロット幅＝６．２５μｓｅｃ）を送信用
スロット及び受信用スロットとして交互に使用してい
る。基地局ではこの送信スロットを使用して移動局へ制
御信号を常時間欠的に送信している。FIG. 2 is a diagram showing the relationship between a conventional mobile terminal in a call waiting state and a control channel signal of a base station. The control slot of the base station has four consecutive slots (# 1 to # 4).
Slot, 1 slot width = 6.25 μsec) are alternately used as a transmission slot and a reception slot. The base station uses this transmission slot to transmit a control signal to the mobile station intermittently.
【０００４】図２（ａ）に示すように論理制御チャネル
は群分け数＝８の場合、システム情報報知用チャネル
（ＢＣＣＨ）、８個の着信情報チャネル（Ｐ１〜Ｐ８Ｃ
Ｈ）、３個のチャネル割り当て制御用チャネル（ＳＣＣ
Ｈ）の合計１２個のチャネルを１．２秒周期で繰り返し
間欠的に受信している（これをＬＣＣＨスーパーフレー
ムという）。各移動局はスーパーフレームの構成及び自
分の端末番号より自局が属する着信ゾーンを算出し、対
応する着信情報チャネルＰ１〜Ｐ８のいずれかを間欠受
信している。移動局は電源を入れると、まず無線通信状
態が一番良好な基地局の送出するスロットを探し、その
中の報知チャネル（ＢＣＣＨ）の送出されるタイミング
で情報を受信する。As shown in FIG. 2 (a), when the number of logical control channels is 8, the system information broadcast channel (BCCH) and the eight incoming information channels (P1 to P8C) are used.
H) three channel allocation control channels (SCC
H), a total of 12 channels are repeatedly and intermittently received in a 1.2 second cycle (this is called an LCCH superframe). Each mobile station calculates an incoming zone to which the mobile station belongs based on the configuration of the superframe and its own terminal number, and intermittently receives one of the corresponding incoming information channels P1 to P8. When the mobile station is powered on, it first searches for a slot to be transmitted by the base station with the best wireless communication condition, and receives information at the timing at which the broadcast channel (BCCH) is transmitted.
【０００５】そして報知メッセージの内容を確認し、チ
ャネル割り当て制御用チャネル（ＳＣＣＨ）でリンクチ
ャネル確率要求メッセージを送信し、基地局からリンク
チャネル割り当てメッセージを受信したら情報チャネル
から位置登録用要求メッセージを送信し、位置登録を行
う。これによりこの移動局の位置する位置登録エリアが
認識される。そして発信する時にはチャネル割り当て制
御用チャネル（ＳＣＣＨ）でリンク確率要求メッセージ
を送信し、基地局からリンクチャネル割り当てメッセー
ジを受信したら通信用チャネル中で呼設定メッセージを
送信し発信を行う。Then, the contents of the broadcast message are confirmed, a link channel probability request message is transmitted on the channel allocation control channel (SCCH), and when a link channel allocation message is received from the base station, a location registration request message is transmitted from the information channel. And perform location registration. Thereby, the location registration area where this mobile station is located is recognized. When transmitting, a link probability request message is transmitted on a channel allocation control channel (SCCH), and upon receiving a link channel allocation message from a base station, a call setup message is transmitted in a communication channel and transmission is performed.
【０００６】発信を行わない場合は、前述した登録され
た位置登録エリア内ですべての基地局によって一斉に行
われる一斉呼出しにつき、着信情報チャネル（ＰＣＨ）
が送出されるタイミングで着呼メッセージや報知受信指
示などを受信する。そして初めのリンク確率要求メッセ
ージが送信された際に、もし基地局の通信用チャネルス
ロット使用状態がすべて使用中の時は、基地局はリンク
チャネル割り当て拒否メッセージを送信する。[0006] When no call is made, the incoming call information channel (PCH) is issued for a simultaneous call made by all base stations in the registered location registration area.
Is received at the timing when is transmitted. Then, when the first link probability request message is transmitted, if all of the base station communication channel slot usage states are in use, the base station transmits a link channel assignment rejection message.
【０００７】移動局はこのメッセージを受信し、無線通
信状態が２番目に良好な基地局の送出するスロットを探
す。そして、初めの基地局に対するのと同じ手続きをこ
の基地局についてもとる。The mobile station receives this message and searches for a slot transmitted by the base station having the second best radio communication condition. The same procedure is followed for this base station as for the first base station.
【０００８】以下同様のシーケンスを繰り返し続ける。Hereinafter, the same sequence is repeated.
【０００９】ＰＨＳ移動局の場合には移動局は待ち受け
中はバッテリセービングのために自局の属する着信群の
着信情報チャネル（ＰＣＨ）を間欠受信している。[0009] In the case of a PHS mobile station, the mobile station intermittently receives a paging information channel (PCH) of a paging group to which the mobile station belongs to save battery during standby.
【００１０】図２に示す例では移動局はＰ１の着信情報
チャネルを受信している。この状態から移動局が待ち受
け先の基地局を変える、もしくは周辺ゾーンのすべての
基地局からの電波をサーチし、最適な待ち受け先となる
基地局を判断する動作へ移行する条件は、連続してｎ秒
間間欠受信した着信情報チャネル（Ｐ１ＣＨ）が受信エ
ラーとなった場合、もしくは連続してｎ秒間受信したＰ
１ＣＨの受信レベルがシステム上指定された閾値（待ち
受けゾーン保持レベル）を下回った場合である。In the example shown in FIG. 2, the mobile station receives the incoming information channel of P1. The conditions under which the mobile station changes the standby base station from this state, or shifts to an operation of searching for radio waves from all base stations in the surrounding zone and determining an optimal standby base station, continuously. If the reception information channel (P1CH) that has been intermittently received for n seconds has a reception error,
This is a case where the reception level of 1CH falls below a threshold (standby zone holding level) specified on the system.
【００１１】[0011]
【発明が解決しようとする課題】仮に、待ち受け先変更
のための判断時間を５秒間に設定した場合、図２に示す
ようにバッテリセービングのためのサーチ周期が１．２
秒の場合、５回に１回正常に受信した場合、あるいは受
信レベルが５回に１回規定値を上回った場合には、移動
局は現在の待ち受け先の基地局からの受信を継続するこ
とになる。ここで判定のための時間を１０秒に設定した
場合には、８回に１回正常受信もしくは受信レベルが規
定値を上回れば待ち受け先の変更は行われない。If the determination time for changing the standby destination is set to 5 seconds, the search cycle for battery saving is 1.2 as shown in FIG.
In the case of seconds, the mobile station should continue receiving from the current standby base station if reception is normal once in five times or if the reception level exceeds the specified value once in five times. become. Here, when the time for the determination is set to 10 seconds, if the normal reception or the reception level exceeds the specified value once every eight times, the standby destination is not changed.
【００１２】このような場合、移動局はたまたま正常に
受信できたＰ１ＣＨ以外のタイミングで、基地局からの
着信信号が送信された場合、移動局は自局への着信を取
り逃がすことになる。In such a case, if the mobile station happens to receive an incoming signal from the base station at a timing other than the P1CH that has been normally received, the mobile station will miss the incoming call to its own station.
【００１３】マルチパスフェージング等により受信レベ
ルが変動している場所等においては着信取り逃がしの確
率が高く、着呼率は低く、サービス品質の低いシステム
となってしまう。In places where the reception level fluctuates due to multipath fading or the like, there is a high probability of missed calls, a low incoming call rate, and a low service quality system.
【００１４】本発明は上述した課題を解決し、移動局が
自局への着信信号の取り逃がしの確率を低減させること
のできるゾーン移行制御方法を提供することを目的とす
る。It is an object of the present invention to solve the above-mentioned problems and to provide a zone shift control method in which a mobile station can reduce the probability of missing an incoming signal to its own station.
【００１５】[0015]
【課題を解決するための手段】本発明は、移動局が複数
の基地局からの制御チャネルデータを間欠受信し、受信
結果に基づいて受信信号が劣化したときには最適な待ち
受け先ゾーンに移行するゾーン移行制御方法において、
所定周期の間欠受信モードで特定ゾーンに属する基地局
からの制御チャネル信号を受信し、受信信号レベルが予
め定めた閾値より低いか、受信エラーがあった場合に
は、前記所定周期よりは短い短周期間欠受信モードで複
数回の受信を行い、各受信毎にエラーの有無と受信信号
レベルとを受信記録として記憶し、この受信記録の解析
により、受信信号の劣化が傾向的と判断された時には他
のゾーンに属する基地局に待ち受け先を移行するように
したものである。According to the present invention, there is provided a zone in which a mobile station intermittently receives control channel data from a plurality of base stations and shifts to an optimum standby zone when a received signal is degraded based on a reception result. In the transition control method,
When a control channel signal from a base station belonging to a specific zone is received in an intermittent reception mode for a predetermined period, and the reception signal level is lower than a predetermined threshold or there is a reception error, a short period shorter than the predetermined period is obtained. Performing multiple receptions in the periodic intermittent reception mode, storing the presence or absence of an error and the reception signal level as a reception record for each reception, and analyzing the reception record, when it is determined that the deterioration of the reception signal is a tendency. The standby destination is shifted to a base station belonging to another zone.
【００１６】ここで、前記短周期間欠受信モードでのエ
ラー発生率が所定の値を越えたときには受信信号の劣化
が傾向的と判断する。Here, when the error occurrence rate in the short-period intermittent reception mode exceeds a predetermined value, it is determined that deterioration of the received signal tends to occur.
【００１７】また、前記短周期間欠受信モードでのレベ
ル劣化発生率が所定の値を越えたときには受信信号の劣
化が傾向的と判断する。When the rate of occurrence of level degradation in the short-period intermittent reception mode exceeds a predetermined value, it is determined that the degradation of the received signal is prone.
【００１８】[0018]
【発明の実施の形態】本発明では移動局が所定周期で間
欠受信している制御チャネルからの制御データは受信エ
ラーもしくは受信レベルがある閾値よりも低い場合に移
動局はより受信間隔の短い短周期間欠受信モードで複数
回の受信を行う。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, control data from a control channel that is intermittently received by a mobile station at a predetermined period is shorter when a reception error or a reception level is lower than a certain threshold. Reception is performed multiple times in the periodic intermittent reception mode.
【００１９】各受信毎のエラーの有無と受信信号レベル
とは受信記録として記憶され、この受信記録の解析によ
り受信信号の結果が傾向的であると判断された時には他
のゾーンに属する基地局に待ち受け先を移行する。これ
により自局への着信信号の取り逃がしの確率を低減させ
る。The presence / absence of an error for each reception and the received signal level are stored as a received record. When the result of the received signal is determined to be a tendency by analyzing the received record, the base station belonging to another zone is transmitted to the base station belonging to another zone. Transfer the destination. This reduces the probability of missing the incoming signal to the own station.
【００２０】次に図１を参照して本発明の実施の形態を
詳細に説明する。Next, an embodiment of the present invention will be described in detail with reference to FIG.
【００２１】図１は本発明によるゾーン移行制御方法の
フローを示したフローチャートである。通常の待ち受け
状態（ステップ１００）においては、移動局は所定周期
の間欠受信モードで特定ゾーンに属する基地局からの制
御チャネル信号を受信している（ステップ１０１）。な
おこの場合の受信周期は通常１．２秒に設定されてい
る。FIG. 1 is a flowchart showing a flow of a zone shift control method according to the present invention. In a normal standby state (step 100), the mobile station is receiving a control channel signal from a base station belonging to a specific zone in an intermittent reception mode at a predetermined cycle (step 101). The reception cycle in this case is normally set to 1.2 seconds.
【００２２】次いで移動局内のＣＰＵにより受信した制
御チャネルの受信データにエラーは無いか、あるいは受
信レベルが閾値以上か否かの判定が行われる（ステップ
１０２）。エラーがなく且つ受信レベルも閾値以上であ
ればステップ１０１に戻り１．２秒の周期で間欠受信モ
ードを継続する。Next, it is determined by the CPU in the mobile station whether there is no error in the received data on the control channel or whether the reception level is equal to or higher than a threshold (step 102). If there is no error and the reception level is equal to or higher than the threshold, the process returns to step 101 and the intermittent reception mode is continued at a cycle of 1.2 seconds.
【００２３】ステップ１０２において、受信した制御チ
ャネルデータにエラーが発生したり、受信レベルが閾値
以下であった場合には１．２秒よりも短い短周期間欠受
信モードに移行する（ステップ１０３）。なお短周期受
信モードにおける受信周期としては例えば０．１秒を設
定することができる。In step 102, if an error occurs in the received control channel data or the reception level is lower than the threshold value, the mode shifts to a short period intermittent reception mode shorter than 1.2 seconds (step 103). Note that, for example, 0.1 second can be set as the reception cycle in the short cycle reception mode.
【００２４】このように短周期間欠受信モードにおいて
在圏ゾーンの基地局からの制御チャネルデータを間欠受
信し、その受信結果を移動局内のメモリに格納する（ス
テップ１０４）。なお受信回数としては短周期間欠受信
モードを０．１秒に設定した場合には１２回とすること
ができる。このように設定すると、図２に示すＬＣＣＨ
スーパーフレームのすべてのチャネルスロットを受信す
ることになる（ステップ１０５）。As described above, in the short-period discontinuous reception mode, the control channel data from the base station in the visited zone is intermittently received, and the reception result is stored in the memory in the mobile station (step 104). The number of receptions can be set to 12 when the short-period intermittent reception mode is set to 0.1 second. With this setting, the LCCH shown in FIG.
All channel slots of the superframe will be received (step 105).
【００２５】ｎ回の受信が完了すると受信結果の解析が
行われる（ステップ１０６）。受信結果の解析は受信回
数に対してエラー発生回数が何回あったか、あるいはレ
ベルの低い受信回数が何回あったか等が解析される。す
なわちエラー発生率とレベル劣化発生率とが算出され
る。When the reception has been completed n times, the reception result is analyzed (step 106). The analysis of the reception result analyzes how many times the number of errors has occurred with respect to the number of times of reception, or how many times the number of times of reception has a low level. That is, the error occurrence rate and the level deterioration occurrence rate are calculated.
【００２６】次いで、このような受信結果の解析に基づ
き受信信号の劣化が傾向的か否かが判定される（ステッ
プ１０７）。ここで受信信号の劣化が傾向的と判断され
る基準としては、エラー発生率が所定の値を越えた場
合、あるいはレベル劣化発生率が所定の値を越えた時が
基準となる。Next, it is determined whether or not the received signal is degraded based on the analysis of the received result (step 107). Here, as a criterion for determining that the received signal is degraded, a reference is made when the error occurrence rate exceeds a predetermined value or when the level deterioration occurrence rate exceeds a predetermined value.
【００２７】受信信号の劣化が傾向的であると判断され
た場合には、ただちに周辺ゾーンの基地局からの制御チ
ャネル信号をモニタし、最適な基地局に対して待ち受け
動作を行うように待ち受けゾーンの移行処理に進む（ス
テップ１０８）。When it is determined that the received signal is degraded, the control channel signal from the base station in the surrounding zone is immediately monitored, and the standby zone is set so that the standby operation is performed with respect to the optimum base station. (Step 108).
【００２８】ステップ１０７において傾向的ではないと
判断された場合には、短周期間欠受信モードを解除し、
通常の間欠受信モードで信号受信を行うステップ１０１
に戻る。If it is determined in step 107 that there is no tendency, the short-period intermittent reception mode is released,
Step 101 for performing signal reception in the normal intermittent reception mode
Return to
【００２９】なお本発明のゾーン移行制御方法はＰＨＳ
システムに基づいて説明したが、本発明はこれに限定さ
れるものではなく、複数の機能チャネルから構成される
スーパーフレームを用いて制御情報を送出するデジタル
携帯電話システム等においても同様に利用することがで
きる。The zone transfer control method according to the present invention uses the PHS
Although the description has been given based on the system, the present invention is not limited to this, and may be similarly used in a digital mobile phone system that transmits control information using a super frame composed of a plurality of function channels. Can be.
【００３０】[0030]
【発明の効果】以上、実施の形態に基づいて詳細に説明
したように、本発明では間欠受信した制御チャネル信号
が受信エラーもしくは受信レベルがある閾値よりも低い
場合には移動局が通常の間欠受信モードから短周期間欠
受信モードに移行し、複数の制御チャネル信号を受信す
ることにより受信状態の劣化が偶発的なものであったの
かそれとも傾向的なものであったのかを判断し、傾向的
であると判断された場合には最適な基地局に移行するよ
うにゾーン移行制御を行うため、移動局が自局への着信
信号の取り逃がしをする確率は低減し、着呼率を向上さ
せることが可能となる。As described above in detail with reference to the embodiments, according to the present invention, when the control channel signal received intermittently is a reception error or the reception level is lower than a certain threshold, the mobile station can perform normal intermittent reception. Shift from the reception mode to the short-period intermittent reception mode, and determine whether the deterioration of the reception state was accidental or tendency by receiving a plurality of control channel signals. If it is determined that the mobile station is in zone transfer control to shift to the optimal base station, the probability of the mobile station missing the incoming signal to the local station is reduced and the incoming call rate is improved. Becomes possible.
【図１】本発明のゾーン移行制御方法を説明するための
フローチャート。FIG. 1 is a flowchart for explaining a zone shift control method of the present invention.
【図２】移動局と基地局との間における制御チャネル信
号の関係を示す図。FIG. 2 is a diagram showing a relationship between control channel signals between a mobile station and a base station.
ＢＣＣＨ：システム情報報知用チャネル ＰＣＨ：着信情報チャネル ＳＣＣＨ：チャネル割り当て制御用チャネル BCCH: System information broadcast channel PCH: Termination information channel SCCH: Channel assignment control channel
Claims (3)
ルデータを間欠受信し、受信結果に基づいて受信信号が
劣化したときには最適な待ち受け先ゾーンに移行するゾ
ーン移行制御方法において、 所定周期の間欠受信モードで特定ゾーンに属する基地局
からの制御チャネル信号を受信し、 受信信号レベルが予め定めた閾値より低いか、受信エラ
ーがあった場合には、前記所定周期よりは短い短周期間
欠受信モードで複数回の受信を行い、 各受信毎にエラーの有無と受信信号レベルとを受信記録
として記憶し、 この受信記録の解析により、受信信号の劣化が傾向的と
判断された時には他のゾーンに属する基地局に待ち受け
先を移行することを特徴とするゾーン移行制御方法。1. A zone transfer control method for a mobile station to intermittently receive control channel data from a plurality of base stations and to shift to an optimal standby zone when a received signal is degraded based on a reception result. In a discontinuous reception mode, a control channel signal from a base station belonging to a specific zone is received, and if the reception signal level is lower than a predetermined threshold or there is a reception error, short period intermittent reception shorter than the predetermined period A plurality of receptions are performed in the mode, and the presence or absence of an error and the reception signal level are stored as a reception record for each reception. When the reception record is analyzed and the deterioration of the reception signal is determined to be a tendency, another zone is used. Transferring the standby destination to a base station belonging to the zone.
おいて、 前記短周期間欠受信モードでのエラー発生率が所定の値
を越えたときには受信信号の劣化が傾向的と判断するこ
とを特徴とするゾーン移行制御方法。2. The zone shift control method according to claim 1, wherein when the error occurrence rate in the short-period intermittent reception mode exceeds a predetermined value, it is determined that the deterioration of the received signal tends to occur. Zone transfer control method to be performed.
おいて、 前記短周期間欠受信モードでのレベル劣化発生率が所定
の値を越えたときには受信信号の劣化が傾向的と判断す
ることを特徴とするゾーン移行制御方法。3. The zone shift control method according to claim 1, wherein when the rate of occurrence of level degradation in the short-term intermittent reception mode exceeds a predetermined value, it is determined that the degradation of the received signal is prone. Zone transfer control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16897699A JP3758421B2 (en) | 1999-06-15 | 1999-06-15 | Zone transfer control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16897699A JP3758421B2 (en) | 1999-06-15 | 1999-06-15 | Zone transfer control method |
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| Publication Number | Publication Date |
|---|---|
| JP2000358268A true JP2000358268A (en) | 2000-12-26 |
| JP3758421B2 JP3758421B2 (en) | 2006-03-22 |
Family
ID=15878060
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16897699A Expired - Fee Related JP3758421B2 (en) | 1999-06-15 | 1999-06-15 | Zone transfer control method |
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| JP2008526140A (en) * | 2004-12-22 | 2008-07-17 | クゥアルコム・インコーポレイテッド | Method and apparatus for efficient paging in a wireless communication system |
| US7433689B2 (en) | 2002-12-10 | 2008-10-07 | Sharp Laboratories Of America, Inc. | Methods and apparatus for acquiring service from a more desirable communication system |
| JP2010021794A (en) * | 2008-07-10 | 2010-01-28 | Sii Data Service Kk | Wireless communication system and control channel changing method |
| JP2010514343A (en) * | 2006-12-20 | 2010-04-30 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Method and arrangement for event triggered DRX cycle coordination |
| US8290497B2 (en) | 2007-07-09 | 2012-10-16 | Fujitsu Limited | Mobile station apparatus and cell selecting method |
| JP2013153457A (en) * | 2006-06-26 | 2013-08-08 | Panasonic Corp | Wireless communication terminal and wireless communication method |
| WO2021066161A1 (en) * | 2019-10-03 | 2021-04-08 | 京セラ株式会社 | Communication control method and user device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7433689B2 (en) | 2002-12-10 | 2008-10-07 | Sharp Laboratories Of America, Inc. | Methods and apparatus for acquiring service from a more desirable communication system |
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| JP2010021794A (en) * | 2008-07-10 | 2010-01-28 | Sii Data Service Kk | Wireless communication system and control channel changing method |
| WO2021066161A1 (en) * | 2019-10-03 | 2021-04-08 | 京セラ株式会社 | Communication control method and user device |
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