JP2003318804A - Mobile communication system and radio communication control method - Google Patents
Mobile communication system and radio communication control methodInfo
- Publication number
- JP2003318804A JP2003318804A JP2002119528A JP2002119528A JP2003318804A JP 2003318804 A JP2003318804 A JP 2003318804A JP 2002119528 A JP2002119528 A JP 2002119528A JP 2002119528 A JP2002119528 A JP 2002119528A JP 2003318804 A JP2003318804 A JP 2003318804A
- Authority
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- Japan
- Prior art keywords
- radio
- retransmission
- base station
- wireless
- mobile
- 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
- 238000004891 communication Methods 0.000 title claims abstract description 109
- 238000010295 mobile communication Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 230000006866 deterioration Effects 0.000 claims description 16
- 230000005684 electric field Effects 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、移動体通信システ
ム及び無線通信制御方法に関する。TECHNICAL FIELD The present invention relates to a mobile communication system and a radio communication control method.
【０００２】[0002]
【従来の技術】従来の移動体通信システムでは、無線移
動局が無線基地局との通信中に弱電界エリアや受信電界
が急激に変化するエリアに入って、無線基地局からの下
り通信品質が劣化し、無線基地局との間で無線制御デー
タの交信ができなくなると、無線制御データのレイヤ２
又はレイヤ３のプロトコルデータを再送するようにし
て、無線制御データ不通による呼切断が発生しないよう
に制御するようにしている。2. Description of the Related Art In a conventional mobile communication system, a wireless mobile station enters a weak electric field area or an area in which a received electric field suddenly changes during communication with the wireless base station, and the downlink communication quality from the wireless base station is reduced. When the wireless control data is deteriorated and the wireless control data cannot be communicated with the wireless base station, the layer 2 of the wireless control data is
Alternatively, the layer 3 protocol data is retransmitted so that the call disconnection due to the non-communication of the radio control data does not occur.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
移動体通信システムにおいては、無線制御データのレイ
ヤ２又はレイヤ３のプロトコルデータ再送回数が無線基
地局からの報知情報によってのみ決定されるので、弱電
界エリアや受信電界が急激に変化するエリアでは、決定
された再送回数では呼切断に至る事態を防止できないこ
とがあるという問題がある。例えば、再送回数が「４」
と決定されていた場合、無線制御データを４回再送して
も交信を回復できないことがある。なお、報知情報は、
通信開始時やランダムアクセスチャネル（ＲＡＣＨ）と
フォーワードアクセスチャネル（ＦＡＣＨ）での制御時
のみ無線移動局に対して通知される。However, in the conventional mobile communication system, since the number of times of retransmission of protocol data of layer 2 or layer 3 of radio control data is determined only by the broadcast information from the radio base station, it is weak. In the electric field area or the area in which the received electric field changes abruptly, there is a problem that it may not be possible to prevent a situation in which the call is disconnected by the determined number of times of retransmission. For example, the number of retransmissions is "4"
If it is determined that the communication is not recovered even if the wireless control data is retransmitted four times. The notification information is
The wireless mobile station is notified only when communication is started or when control is performed on the random access channel (RACH) and the forward access channel (FACH).
【０００４】本発明は係る点に鑑みてなされたものであ
り、無線移動局が弱電界エリアや受信電界が急激に変化
するエリアに入っても呼切断に至る事態になることを防
止することができる移動体通信システム及び移動通信制
御方法を提供することを目的とする。The present invention has been made in view of the above problems, and can prevent a situation in which a call is disconnected even when a wireless mobile station enters a weak electric field area or an area where the received electric field changes abruptly. An object of the present invention is to provide a mobile communication system and a mobile communication control method that can be performed.
【０００５】[0005]
【課題を解決するための手段】請求項１に係る発明の移
動体通信システムは、無線基地局と、この無線基地局と
無線通信回線を介して通信を行う無線移動局とを具備す
る移動体通信システムであって、前記無線移動局は、前
記無線基地局からの下り通信品質の劣化の程度に応じて
無線通信プロトコルのレイヤ２又はレイヤ３の無線制御
データを再送する再送制御手段を具備する構成を採る。A mobile communication system according to a first aspect of the present invention includes a wireless base station and a wireless mobile station that communicates with the wireless base station via a wireless communication line. In the communication system, the wireless mobile station includes a retransmission control unit that retransmits layer 2 or layer 3 wireless control data of a wireless communication protocol according to the degree of deterioration of downlink communication quality from the wireless base station. Take the composition.
【０００６】この構成によれば、無線移動局が弱電界エ
リアや受信電界が急激に変化するエリアに入って、無線
基地局からの下り通信品質が劣化すると、無線移動局で
レイヤ２又はレイヤ３のプロトコルデータの再送を行う
ので、無線制御データ不通による呼切断に至る事態にな
ることを防止することができる。According to this configuration, when the wireless mobile station enters the weak electric field area or the area where the received electric field changes rapidly and the downlink communication quality from the wireless base station deteriorates, the wireless mobile station receives Layer 2 or Layer 3 Since the protocol data is retransmitted, it is possible to prevent the situation in which the call is disconnected due to the interruption of the wireless control data.
【０００７】請求項２に係る発明の移動体通信システム
は、請求項１に係る発明の移動体通信システムにおい
て、前記再送制御手段は、前記無線基地局からの再送要
求信号を受信した場合にも前記無線制御データの再送を
行う構成を採る。A mobile communication system according to a second aspect of the present invention is the mobile communication system according to the first aspect of the present invention, wherein the retransmission control means also receives a retransmission request signal from the radio base station. The wireless control data is retransmitted.
【０００８】この構成によれば、無線移動局は、無線基
地局から再送要求を受けた場合にも無線制御データの再
送を行う。According to this structure, the radio mobile station retransmits the radio control data even when receiving a retransmission request from the radio base station.
【０００９】請求項３に係る発明の移動体通信システム
は、請求項１又は請求項２に係る発明の移動体通信シス
テムにおいて、前記再送制御手段は、前記無線基地局か
らの下り通信品質の劣化の程度に応じた再送回数の設定
を行う構成を採る。A mobile communication system according to a third aspect of the present invention is the mobile communication system according to the first or second aspect of the present invention, wherein the retransmission control means deteriorates downlink communication quality from the radio base station. The number of retransmissions is set according to the degree of.
【００１０】この構成によれば、無線基地局からの下り
通信品質がある程度（例えば無線通信データの交信が不
通になる程度）まで劣化すると、そのときの下り通信品
質の劣化の程度に応じた再送回数の設定を行うので、再
送回数が固定の従来技術と比べて、交信回復の確率が高
まる。According to this configuration, when the downlink communication quality from the radio base station deteriorates to a certain degree (for example, communication of radio communication data is interrupted), retransmission is performed according to the degree of deterioration of the downlink communication quality at that time. Since the number of times is set, the probability of communication recovery increases as compared with the conventional technique in which the number of retransmissions is fixed.
【００１１】請求項４に係る発明の移動体通信システム
は、請求項３に係る発明の移動体通信システムにおい
て、前記再送制御手段は、前記無線基地局からの下り通
信品質の劣化の程度に応じた再送時間間隔の設定を行う
構成を採る。A mobile communication system according to a fourth aspect of the present invention is the mobile communication system according to the third aspect of the present invention, wherein the retransmission control means depends on a degree of deterioration of downlink communication quality from the radio base station. The configuration is used to set the retransmission time interval.
【００１２】この構成によれば、無線基地局からの下り
通信品質がある程度（例えば無線通信データの交信が不
通になる程度）まで劣化すると、そのときの下り通信品
質の劣化の程度に応じた再送回数及び再送時間間隔の設
定を行うので、再送回数のみ制御する場合と比べて更に
交信回復の確率が高まる。According to this structure, when the downlink communication quality from the radio base station deteriorates to a certain degree (for example, the extent to which communication of radio communication data is interrupted), retransmission is performed according to the degree of deterioration of the downlink communication quality at that time. Since the number of times and the retransmission time interval are set, the probability of communication recovery is further increased as compared with the case where only the number of retransmissions is controlled.
【００１３】請求項５に係る発明の移動体通信システム
は、請求項１から請求項４のいずれかに係る発明の移動
体通信システムにおいて、前記再送制御手段は、前記無
線基地局からの下り通信品質の劣化の程度に応じた再送
送信電力の設定を行う構成を採る。A mobile communication system according to a fifth aspect of the present invention is the mobile communication system according to any one of the first to fourth aspects, wherein the retransmission control means is a downlink communication from the radio base station. A configuration is adopted in which the retransmission transmission power is set according to the degree of quality deterioration.
【００１４】この構成によれば、無線基地局からの下り
通信品質がある程度（例えば無線通信データの交信が不
通になる程度）まで劣化すると、そのときの下り通信品
質の劣化の程度に応じた再送回数、再送時間間隔及び再
送送信電力の設定を行うので、再送回数と再送時間間隔
を制御する場合と比べて更に交信回復の確率が高まる。According to this structure, when the downlink communication quality from the radio base station deteriorates to a certain degree (for example, the extent to which communication of radio communication data is interrupted), retransmission is performed according to the degree of deterioration of the downlink communication quality at that time. Since the number of times, the retransmission time interval and the retransmission transmission power are set, the probability of communication recovery is further increased as compared with the case where the number of retransmissions and the retransmission time interval are controlled.
【００１５】請求項６に係る発明の移動体通信システム
は、請求項５に係る発明の移動体通信システムにおい
て、前記再送制御手段は、前記無線基地局からの下り通
信品質の劣化に従って前記再送回数を増加させると共に
前記再送時間間隔を短くし、更に前記再送送信電力を増
加させる構成を採る。A mobile communication system according to a sixth aspect of the present invention is the mobile communication system according to the fifth aspect of the present invention, wherein the retransmission control means sets the number of retransmissions according to deterioration of downlink communication quality from the radio base station. Is increased, the retransmission time interval is shortened, and the retransmission transmission power is further increased.
【００１６】この構成によれば、無線基地局からの下り
通信品質がある程度（例えば無線通信データの交信が不
通になる程度）まで劣化すると、再送回数を増加させる
と共に再送時間間隔を短くし、更に再送送信電力を増加
させるので、再送回数が固定の従来技術と比べて交信回
復の確率が高まる。According to this configuration, when the downlink communication quality from the radio base station deteriorates to a certain degree (for example, communication of radio communication data is interrupted), the number of retransmissions is increased and the retransmission time interval is shortened. Since the retransmission transmission power is increased, the probability of communication recovery is increased as compared with the related art in which the number of retransmissions is fixed.
【００１７】ここで、無線基地局側が、無線移動局から
の無線制御データが不通になった場合にレイヤ２／３の
受信獲得タイマに設定された任意時間で無線移動局との
通信を切断する機能を備えている場合、再送回数を増加
させたときでも再送時間間隔を短くすることによって前
記タイマの設定時間内で多くの無線制御データを送信す
ることが可能となる。また、再送回数を増やしても無線
制御データが通信できない場合は、再送回数の増加に伴
って送信電力を段階的に増加させていくことで、無線制
御データの通信が可能となる。Here, when the radio control data from the radio mobile station is cut off, the radio base station disconnects communication with the radio mobile station at an arbitrary time set in the reception acquisition timer of layer 2/3. When the function is provided, it is possible to transmit a large amount of wireless control data within the set time of the timer by shortening the retransmission time interval even when the number of retransmissions is increased. If the wireless control data cannot be communicated even if the number of retransmissions is increased, the wireless control data can be communicated by gradually increasing the transmission power as the number of retransmissions is increased.
【００１８】請求項７に係る発明の移動体通信システム
は、請求項１から請求項６のいずれかに係る発明の移動
体通信システムにおいて、前記無線移動局は、前記無線
基地局からの下り通信品質の劣化の程度を判定するため
の閾値を記憶する閾値記憶手段を具備し、前記無線移動
局の再送制御手段は、前記無線基地局からの下り通信品
質が前記閾値記憶手段に記憶されている閾値以下になる
と再送制御を開始する構成を採る。A mobile communication system according to a seventh aspect of the present invention is the mobile communication system according to any one of the first to sixth aspects, wherein the radio mobile station is a downlink communication from the radio base station. The retransmission control means of the radio mobile station is provided with a threshold storage means for storing a threshold for determining the degree of deterioration of quality, and the downlink communication quality from the radio base station is stored in the threshold storage means. A configuration is adopted in which retransmission control is started when the threshold value is not more than the threshold value.
【００１９】この構成によれば、再送制御又は下り通信
品質判定を行うために用いる閾値を保存又は書き換えが
可能となるので、様々な通信環境に対して最適な再送制
御が可能となる。According to this configuration, the threshold value used for the retransmission control or the downlink communication quality judgment can be stored or rewritten, so that the optimal retransmission control can be performed for various communication environments.
【００２０】請求項８に係る発明の無線通信制御方法
は、無線移動局から無線基地局へ無線通信プロトコルの
レイヤ２又はレイヤ３の無線制御データを送信する無線
通信制御方法であって、前記無線基地局からの下り通信
品質の劣化の程度に応じて前記無線移動局にて無線制御
データの再送が必要な場合、前記下り通信品質が劣化す
るに従って前記無線制御データを再送する回数を増加さ
せると共に再送時間間隔を短く、更に前記無線制御デー
タの再送回数を増加させても通信ができない場合には前
記無線制御データの再送回数に応じて送信電力を段階的
に増加させる。A radio communication control method according to an eighth aspect of the present invention is a radio communication control method for transmitting radio control data of layer 2 or layer 3 of a radio communication protocol from a radio mobile station to a radio base station. When it is necessary to retransmit radio control data in the radio mobile station according to the degree of deterioration of the downlink communication quality from the base station, while increasing the number of times the radio control data is retransmitted as the downlink communication quality deteriorates. When communication is not possible even if the retransmission time interval is shortened and the number of times the wireless control data is retransmitted is increased, the transmission power is increased stepwise according to the number of times the wireless control data is retransmitted.
【００２１】この方法によれば、無線基地局からの下り
通信品質がある程度（例えば無線通信データの交信が不
通になる程度）まで劣化すると、再送回数を増加させる
と共に再送時間間隔を短くし、更に再送送信電力を増加
させるので、再送回数が固定の従来技術と比べて交信回
復の確率が高まる。According to this method, when the downlink communication quality from the radio base station is deteriorated to a certain degree (for example, communication of radio communication data is interrupted), the number of retransmissions is increased and the retransmission time interval is shortened. Since the retransmission transmission power is increased, the probability of communication recovery is increased as compared with the related art in which the number of retransmissions is fixed.
【００２２】[0022]
【発明の実施の形態】本発明の骨子は、無線移動局が無
線基地局からの下り通信品質を監視して、下り通信品質
の劣化に応じて無線制御データの再送を制御することで
ある。BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is that a radio mobile station monitors the downlink communication quality from a radio base station and controls the retransmission of radio control data according to the deterioration of the downlink communication quality.
【００２３】以下、本発明の実施の形態について、図面
を参照して詳細に説明する。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
【００２４】（実施の形態１）図１は、本発明の実施の
形態１に係る移動体通信システムの構成を示すブロック
図である。(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a mobile communication system according to Embodiment 1 of the present invention.
【００２５】図１において、本実施の形態の移動体通信
システムは、無線基地局１００と、この無線基地局１０
０と交信を行う無線移動局１１０とを備えている。無線
移動局１１０は、無線信号の送受信を行う送受信部１１
１と、音声信号や無線制御データを含むベースバンド信
号を生成するとともに、受信した無線信号からベースバ
ンド信号を復調するベースバンド信号処理部１１２と、
受信した無線基地局１００からの無線信号の品質を測定
する下り通信品質測定部１１３と、無線制御データの再
送制御を行う無線制御データ送信制御部１１４と、再送
制御用の各種パラメータを記憶する再送制御用パラメー
タ記憶部１１５とを備えて構成される。なお、無線基地
局１００から無線移動局１１０へ送られるデータが下り
通信データであり、無線移動局１１０から無線基地局１
００へ送られるデータが上り通信データである。In FIG. 1, the mobile communication system according to the present embodiment has a radio base station 100 and a radio base station 10.
0 and a wireless mobile station 110 that communicates with 0. The wireless mobile station 110 includes a transmitting / receiving unit 11 that transmits and receives wireless signals.
1, and a baseband signal processing unit 112 that generates a baseband signal including a voice signal and radio control data and demodulates the baseband signal from the received radio signal,
Downlink communication quality measurement unit 113 that measures the quality of the received wireless signal from wireless base station 100, wireless control data transmission control unit 114 that controls the retransmission of wireless control data, and retransmission that stores various parameters for retransmission control. And a control parameter storage unit 115. The data transmitted from the radio base station 100 to the radio mobile station 110 is downlink communication data, and the data transmitted from the radio mobile station 110 to the radio base station 1
The data sent to 00 is upstream communication data.
【００２６】下り通信品質測定部１１３は、送受信部１
１１で受信された下り通信データと、ベースバンド信号
処理部１１２で処理された下り通信データとから下り通
信品質パラメータ値を決定する。ここで、下り通信品質
パラメータには、ＳＩＲ(Signal Interference Rati
o)、Ｅｃ／Ｎｏ(Received energy per chip divided by
the power density in the band)、ＲＳＣＰ(Received
Signal Code power)、Ｐａｔｈｌｏｓｓ(下り通信伝搬
損失)、ＢＬＥＲ(Block Error Rate)、ＣＲＣ(Cyclic R
edundancy Check)等がある。The downlink communication quality measuring unit 113 includes a transmitting / receiving unit 1
A downlink communication quality parameter value is determined from the downlink communication data received at 11 and the downlink communication data processed at the baseband signal processing unit 112. Here, the downlink communication quality parameter includes SIR (Signal Interference Rati
o), Ec / No (Received energy per chip divided by
the power density in the band), RSCP (Received
Signal Code power), Pathloss (downlink communication propagation loss), BLER (Block Error Rate), CRC (Cyclic R)
edundancy Check) etc.
【００２７】再送制御用パラメータ記憶部１１５には、
下り品質パラメータ閾値の他に、再送回数、再送時間間
隔、再送送信電力が記憶されている。無線制御データ送
信制御部１１４は、下り通信品質測定部１１３からの下
り通信品質パラメータ値と再送制御用パラメータ記憶部
１１５に記憶されている下りパラメータ閾値とを比較し
て、下り通信品質パラメータ値が下り品質パラメータ閾
値以下であれば、再送制御用パラメータ記憶部１１５に
記憶されている再送回数、再送時間間隔、再送送信電力
値を再送発生時の再送制御パラメータとして決定する。
そして、無線制御データを再送する必要が生じた場合に
この再送制御パラメータを使用して無線制御データを送
信する。The retransmission control parameter storage unit 115 stores
In addition to the downlink quality parameter threshold, the number of retransmissions, retransmission time interval, and retransmission transmission power are stored. The radio control data transmission control unit 114 compares the downlink communication quality parameter value from the downlink communication quality measuring unit 113 with the downlink parameter threshold value stored in the retransmission control parameter storage unit 115, and determines that the downlink communication quality parameter value is If it is equal to or lower than the downlink quality parameter threshold value, the number of retransmissions, the retransmission time interval, and the retransmission transmission power value stored in the retransmission control parameter storage unit 115 are determined as retransmission control parameters when retransmission occurs.
Then, when it becomes necessary to retransmit the wireless control data, the wireless control data is transmitted using this retransmission control parameter.
【００２８】図２は、本実施の形態の移動体通信システ
ムにおける再送手順を示すシーケンス図である。この図
に示すように、無線移動局１１０が無線基地局１００と
通信している間に定期的に下り通信品質の測定を行う。
そして、下り通信品質を判定する下り通信品質パラメー
タ値（ＳＩＲ、Ｅｃ／Ｎｏ、ＲＳＣＰ、Ｐａｔｈｌｏｓ
ｓ、ＢＬＥＲ、ＣＲＣ等）が、再送制御用パラメータ記
憶部１１５に記憶されている下り品質パラメータ閾値以
下になった場合、再送制御パラメータの設定を変更す
る。そして、下り通信品質が劣化して交信が不通になっ
た場合、再送制御を行って交信の回復を図る。この図の
例では無線制御データを４回送っており、４回目で無線
制御データが無線基地局１００に届いて交信が回復して
いる。FIG. 2 is a sequence diagram showing a retransmission procedure in the mobile communication system of this embodiment. As shown in this figure, while the mobile radio station 110 is communicating with the radio base station 100, downlink communication quality is regularly measured.
Then, downlink communication quality parameter values (SIR, Ec / No, RSCP, Pathloss) for determining downlink communication quality
s, BLER, CRC, etc.) is equal to or lower than the downlink quality parameter threshold value stored in the retransmission control parameter storage unit 115, the setting of the retransmission control parameter is changed. Then, when the downlink communication quality is deteriorated and communication is cut off, retransmission control is performed to restore communication. In the example of this figure, the wireless control data is sent four times, and at the fourth time, the wireless control data reaches the wireless base station 100 and communication is restored.
【００２９】図３は、無線移動局１１０における再送制
御動作を示すフローチャートである。なお、再送制御用
パラメータ記憶部１１５には予め所定の値の下り通信品
質パラメータ値（再送回数値、再送時間間隔値、再送送
信電力値、ＳＩＲ閾値、Ｅｃ/Ｎｏ閾値、ＲＳＣＰ閾
値、Ｐａｔｈｌｏｓｓ閾値、ＢＬＥＲ閾値、ＣＲＣ閾
値）が設定されているものとする。FIG. 3 is a flowchart showing a retransmission control operation in the radio mobile station 110. It should be noted that the retransmission control parameter storage unit 115 has a predetermined downlink communication quality parameter value (retransmission count value, retransmission time interval value, retransmission transmission power value, SIR threshold value, Ec / No threshold value, RSCP threshold value, Pathloss threshold value, BLER threshold and CRC threshold) are set.
【００３０】無線移動局１１０が無線基地局１００と通
信を開始すると、まず無線基地局１００からの下り通信
データより下り通信品質を測定する（ステップ３０
０）。そして、測定した下り通信品質と再送制御用パラ
メータ記憶部１１５に格納された下り品質パラメータ閾
値とを比較し（ステップ３０１）、測定した下り品質パ
ラメータ値が下り品質パラメータ閾値未満であればステ
ップ３００に戻り、下り品質パラメータ閾値以上であれ
ばステップ３０２に進む。When the radio mobile station 110 starts communication with the radio base station 100, first, the downlink communication quality is measured from the downlink communication data from the radio base station 100 (step 30).
0). Then, the measured downlink communication quality is compared with the downlink quality parameter threshold value stored in the retransmission control parameter storage unit 115 (step 301). If the measured downlink quality parameter value is less than the downlink quality parameter threshold value, step 300 is performed. Returning to step 302, if the downlink quality parameter threshold value is exceeded, the process proceeds to step 302.
【００３１】ステップ３０２に進むと、再送制御用パラ
メータ記憶部１１５に記憶されている再送回数値を再送
回数（例えば４回）として設定し、またステップ３０３
で再送制御用パラメータ記憶部１１５に記憶されている
再送時間間隔値を再送時間間隔として設定し、更にステ
ップ３０４で再送制御用パラメータ記憶部１１５に記憶
されている再送送信電力値を再送送信電力として設定す
る。At step 302, the number of times of retransmission stored in the retransmission control parameter storage unit 115 is set as the number of times of retransmission (for example, 4 times), and at step 303.
In step 304, the retransmission time interval value stored in the retransmission control parameter storage unit 115 is set as the retransmission time interval, and in step 304, the retransmission transmission power value stored in the retransmission control parameter storage unit 115 is set as the retransmission transmission power. Set.
【００３２】これらの値の設定後、無線基地局１００と
の間の交信が不通になった否かを判定し（ステップ３０
５）、無線基地局１００との間の交信が不通でない場合
はこの判定を繰り返し、不通である場合はステップ３０
６に進む。ステップ３０６に進むと、レイヤ２/レイヤ
３上り無線制御データの１回目の再送を行う。この無線
制御データの１回目の再送を行った後、設定された再送
時間間隔で連続して４回まで同データの再送を行う（ス
テップ３０７、３０８、３０９）。After setting these values, it is judged whether or not communication with the radio base station 100 has been cut off (step 30).
5) If the communication with the wireless base station 100 is not interrupted, this determination is repeated, and if not, step 30.
Go to 6. In step 306, the layer 2 / layer 3 uplink radio control data is retransmitted for the first time. After the first retransmission of the radio control data, the same data is retransmitted up to four times continuously at the set retransmission time interval (steps 307, 308, 309).
【００３３】無線制御データの再送を行った後、無線基
地局１００からのレイヤ２/レイヤ３下り無線制御デー
タを受信できたか否かを判定し（ステップ３１０）、レ
イヤ２/レイヤ３下り無線制御データを受信できた場合
は交信が回復したとして、ステップ３００に戻り、再び
下り通信品質の測定を開始する。これに対して、レイヤ
２/レイヤ３下り無線制御データを受信できなかった場
合は、レイヤ２/レイヤ３上り無線制御データが無線基
地局１００に通知されなかったとして、再送回数値及び
再送送信電力値を所定の値だけ増加させるとともに、再
送時間間隔値を所定時間だけ短くして、再度、ステップ
３０２〜ステップ３１０の処理を行う。After retransmitting the radio control data, it is judged whether or not the layer 2 / layer 3 downlink radio control data from the radio base station 100 has been received (step 310), and the layer 2 / layer 3 downlink radio control is performed. If the data can be received, it is considered that the communication has been recovered, and the process returns to step 300, and the downlink communication quality measurement is started again. On the other hand, when the layer 2 / layer 3 downlink radio control data cannot be received, it is determined that the layer 2 / layer 3 uplink radio control data has not been notified to the radio base station 100, and the retransmission count value and the retransmission transmission power are set. The value is increased by a predetermined value, the retransmission time interval value is shortened by a predetermined time, and the processes of steps 302 to 310 are performed again.
【００３４】このように、本実施の形態の移動体通信シ
ステムによれば、無線移動局１１０の下り通信品質パラ
メータ値を定期的に監視し、下り通信品質が劣化した場
合に、再送回数、再送時間間隔及び再送送信電力の設定
を行って無線制御データの再送を行う。したがって、無
線移動局１１０が弱電界エリアや受信電界が急激に変化
するエリアに入っても呼切断に至る事態になることを防
止することが可能となる。As described above, according to the mobile communication system of the present embodiment, the downlink communication quality parameter value of the radio mobile station 110 is regularly monitored, and when the downlink communication quality is deteriorated, the number of retransmissions and the number of retransmissions are performed. The wireless control data is retransmitted by setting the time interval and retransmission transmission power. Therefore, even when the wireless mobile station 110 enters the weak electric field area or the area in which the received electric field changes rapidly, it is possible to prevent the situation in which the call is disconnected.
【００３５】（実施の形態２）図４は、本発明の実施の
形態２に係る移動体通信システムにおける再送手順を示
すシーケンス図である。なお、無線基地局と無線移動局
の基本機能は実施の形態１と同様であるので、図１を援
用することとする。(Embodiment 2) FIG. 4 is a sequence diagram showing a retransmission procedure in the mobile communication system according to Embodiment 2 of the present invention. Since the basic functions of the wireless base station and the wireless mobile station are the same as those in the first embodiment, FIG. 1 will be referred to.
【００３６】図４に示すように、本実施の形態の移動体
通信システムは、無線基地局１００が受信したレイヤ２
/レイヤ３上り無線制御データにデータ誤りを検出する
と、無線移動局１１０に対して上りデータの再送要求を
送信し、無線移動局１１０がこの上りデータ再送要求を
受信することで、再送制御用パラメータ記憶部１１５に
記憶されている再送制御設定内容を変更して再送制御を
行い、交信の回復を図るものである。As shown in FIG. 4, the mobile communication system according to the present embodiment has the layer 2 received by the radio base station 100.
/ When a data error is detected in the layer 3 uplink radio control data, a retransmission request for uplink data is transmitted to the radio mobile station 110, and the radio mobile station 110 receives this uplink data retransmission request, thereby making a retransmission control parameter. The contents of the retransmission control setting stored in the storage unit 115 are changed to perform the retransmission control to restore the communication.
【００３７】すなわち、無線移動局１１０に、下り通信
品質を監視して再送制御を行う機能と、無線基地局１０
０からの再送要求を受信することで再送制御を行う、と
いう２つの機能を設けたものである。これにより、無線
移動局１１０でレイヤ２／レイヤ３無線制御データの再
送制御を実施の形態１よりも更に自由に行えるようにな
り、交信不通になる事態を更に減少させることが可能と
なる。That is, the radio base station 10 has a function of monitoring downlink communication quality and performing retransmission control in the radio mobile station 110.
It is provided with two functions of performing retransmission control by receiving a retransmission request from 0. As a result, the wireless mobile station 110 can perform retransmission control of layer 2 / layer 3 wireless control data more freely than in the first embodiment, and it is possible to further reduce the situation in which communication is lost.
【００３８】図５は、無線移動局１１０における再送制
御動作を示すフローチャートである。なお、再送制御用
パラメータ記憶部１１５には予め所定の値の下り通信品
質パラメータ値（再送回数値、再送時間間隔値、再送送
信電力値、ＳＩＲ閾値、Ｅｃ/Ｎｏ閾値、ＲＳＣＰ閾
値、Ｐａｔｈｌｏｓｓ閾値、ＢＬＥＲ閾値、ＣＲＣ閾
値）が設定されているものとする。FIG. 5 is a flowchart showing the retransmission control operation in the radio mobile station 110. It should be noted that the retransmission control parameter storage unit 115 has a predetermined downlink communication quality parameter value (retransmission count value, retransmission time interval value, retransmission transmission power value, SIR threshold value, Ec / No threshold value, RSCP threshold value, Pathloss threshold value, BLER threshold and CRC threshold) are set.
【００３９】無線移動局１１０の電源を投入した直後、
無線基地局１００からの上りデータ再送要求を受信した
か否かを判定する（ステップ５００）。この判定におい
て、上りデータ再送要求を受信しない場合はこの判定を
繰り返し、上りデータ再送要求を受信した場合はステッ
プ５０１に進む。Immediately after turning on the power of the wireless mobile station 110,
It is determined whether an uplink data retransmission request from the radio base station 100 has been received (step 500). In this determination, if the uplink data retransmission request is not received, this determination is repeated, and if the uplink data retransmission request is received, the process proceeds to step 501.
【００４０】ステップ５０１に進むと、再送制御用パラ
メータ記憶部１１５に記憶されている再送回数値を再送
回数（例えば４回）として設定し、次いでステップ５０
２で再送制御用パラメータ記憶部１１５に記憶されてい
る再送時間間隔値を再送時間間隔として設定する。更に
ステップ５０３で再送制御用パラメータ記憶部１１５に
記憶されている再送送信電力値を再送送信電力として設
定する。これらの値の設定後、ステップ５０４に進み、
レイヤ２/レイヤ３上り無線制御データの１回目の再送
を行う。この無線制御データの１回目の再送を行った
後、設定された再送時間間隔で連続して４回まで同デー
タの再送を行う（ステップ５０５、５０６、５０７）。In step 501, the number of retransmissions stored in the retransmission control parameter storage unit 115 is set as the number of retransmissions (for example, 4 times), and then in step 50.
In step 2, the retransmission time interval value stored in the retransmission control parameter storage unit 115 is set as the retransmission time interval. Further, in step 503, the retransmission transmission power value stored in the retransmission control parameter storage unit 115 is set as the retransmission transmission power. After setting these values, proceed to step 504,
The layer 2 / layer 3 uplink radio control data is retransmitted for the first time. After the first retransmission of the radio control data, the same data is retransmitted up to four times continuously at the set retransmission time interval (steps 505, 506, 507).
【００４１】無線制御データの再送を４回行った後、無
線基地局１００からのレイヤ２/レイヤ３下り無線制御
データを受信できたか否かを判定し（ステップ５０
８）、レイヤ２/レイヤ３下り無線制御データを受信で
きた場合は交信が回復したとして、ステップ５００に戻
り、再び下り通信品質の測定を開始する。これに対し
て、レイヤ２/レイヤ３下り無線制御データを受信でき
なかった場合はレイヤ２/レイヤ３上り無線制御データ
が無線基地局１００に通知されなかったとして、再送回
数値及び再送送信電力値を所定の値だけ増加させるとと
もに、再送時間間隔値を所定時間だけ短くして、再度、
ステップ５０１〜ステップ５０８の処理を行う。After retransmitting the radio control data four times, it is judged whether or not the layer 2 / layer 3 downlink radio control data from the radio base station 100 has been received (step 50).
8) If it is possible to receive the layer 2 / layer 3 downlink radio control data, it is determined that the communication is restored, the process returns to step 500, and the downlink communication quality measurement is started again. On the other hand, when the layer 2 / layer 3 downlink radio control data cannot be received, it is assumed that the layer 2 / layer 3 uplink radio control data has not been notified to the radio base station 100, and the retransmission count value and the retransmission transmission power value Is increased by a predetermined value, the retransmission time interval value is shortened by a predetermined time, and
The processing of steps 501 to 508 is performed.
【００４２】このように、本実施の形態の移動体通信シ
ステムによれば、無線基地局１００と無線移動局１１０
との交信中にレイヤ２/レイヤ３上り無線制御データに
誤りが発生した場合、無線基地局１００が上りデータの
再送要求し、無線移動局１１０がこの再送要求を受信す
ることで、再送回数、再送時間間隔及び再送送信電力の
設定を行って無線制御データの再送を行うので、無線移
動局１１０にのみ再送制御機能を設けた場合と比べて交
信不通になる事態を更に減少させることが可能になる。As described above, according to the mobile communication system of this embodiment, the radio base station 100 and the radio mobile station 110 are connected.
When an error occurs in the layer 2 / layer 3 uplink radio control data during the communication with the wireless base station 100, the radio base station 100 requests the retransmission of the uplink data, and the radio mobile station 110 receives the retransmission request. Since the wireless control data is retransmitted by setting the retransmission time interval and the retransmission transmission power, it is possible to further reduce the situation where communication is lost as compared with the case where only the wireless mobile station 110 is provided with the retransmission control function. Become.
【００４３】[0043]
【発明の効果】以上説明したように、本発明によれば、
無線移動局が弱電界エリアや受信電界が急激に変化する
エリアに入っても呼切断に至る事態になることを防止す
ることができ、常に安定した通信を実現することができ
る。As described above, according to the present invention,
Even when the wireless mobile station enters the weak electric field area or the area where the received electric field changes abruptly, it is possible to prevent a situation in which the call is disconnected, and it is possible to always realize stable communication.
【図１】本発明の実施の形態１に係る移動体通信システ
ムの構成を示すブロック図FIG. 1 is a block diagram showing a configuration of a mobile communication system according to a first embodiment of the present invention.
【図２】本発明の実施の形態１に係る移動体通信システ
ムの再送手順を説明するためのシーケンス図FIG. 2 is a sequence diagram for explaining a retransmission procedure of the mobile communication system according to the first embodiment of the present invention.
【図３】本発明の実施の形態１に係る移動体通信システ
ムの再送手順を説明するためのフローチャートFIG. 3 is a flowchart for explaining a retransmission procedure of the mobile communication system according to the first embodiment of the present invention.
【図４】本発明の実施の形態２に係る移動体通信システ
ムの再送手順を説明するためのシーケンス図FIG. 4 is a sequence diagram for explaining a retransmission procedure of the mobile communication system according to the second embodiment of the present invention.
【図５】本発明の実施の形態２に係る移動体通信システ
ムの再送手順を説明するためのフローチャートFIG. 5 is a flowchart for explaining a retransmission procedure of the mobile communication system according to the second embodiment of the present invention.
１００ 無線基地局 １１０ 無線移動局 １１１ 送受信部 １１２ ベースバンド信号処理部 １１３ 下り通信品質測定部 １１４ 無線制御データ送信制御部 １１５ 再送制御用パラメータ記憶部 100 wireless base stations 110 wireless mobile station 111 Transmitter / receiver 112 Baseband signal processing unit 113 Downlink communication quality measurement unit 114 wireless control data transmission control unit 115 Retransmission control parameter storage unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 市川 泰史 神奈川県横浜市港北区綱島東四丁目３番１ 号 松下通信工業株式会社内 Ｆターム(参考） 5K014 AA01 DA02 FA03 FA11 5K033 AA07 CB03 DA17 DB16 EA02 5K034 AA06 EE03 FF02 HH01 HH02 HH11 KK21 KK27 LL06 MM03 SS02 TT02 5K067 AA23 DD45 EE02 EE10 GG04 GG08 GG11 HH22 HH23 HH28 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Yasushi Ichikawa 3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industry Co., Ltd. F-term (reference) 5K014 AA01 DA02 FA03 FA11 5K033 AA07 CB03 DA17 DB16 EA02 5K034 AA06 EE03 FF02 HH01 HH02 HH11 KK21 KK27 LL06 MM03 SS02 TT02 5K067 AA23 DD45 EE02 EE10 GG04 GG08 GG11 HH22 HH23 HH28
Claims (8)
信回線を介して通信を行う無線移動局とを具備する移動
体通信システムであって、前記無線移動局は、前記無線
基地局からの下り通信品質の劣化の程度に応じて無線通
信プロトコルのレイヤ２又はレイヤ３の無線制御データ
を再送する再送制御手段を具備することを特徴とする移
動体通信システム。1. A mobile communication system comprising: a radio base station; and a radio mobile station that communicates with the radio base station via a radio communication line, wherein the radio mobile station is connected to the radio base station. A mobile communication system comprising: a retransmission control unit that retransmits layer 2 or layer 3 wireless control data of a wireless communication protocol according to the degree of deterioration of the downlink communication quality.
らの再送要求信号を受信した場合にも前記無線制御デー
タの再送を行うことを特徴とする請求項１記載の移動体
通信システム。2. The mobile communication system according to claim 1, wherein the retransmission control means retransmits the wireless control data even when receiving a retransmission request signal from the wireless base station.
らの下り通信品質の劣化の程度に応じた再送回数の設定
を行うことを特徴とする請求項１又は請求項２記載の移
動体通信システム。3. The mobile communication according to claim 1, wherein the retransmission control unit sets the number of retransmissions according to the degree of deterioration of downlink communication quality from the radio base station. system.
らの下り通信品質の劣化の程度に応じた再送時間間隔の
設定を行うことを特徴とする請求項３記載の移動体通信
システム。4. The mobile communication system according to claim 3, wherein the retransmission control means sets a retransmission time interval according to a degree of deterioration of downlink communication quality from the radio base station.
らの下り通信品質の劣化の程度に応じた再送送信電力の
設定を行うことを特徴とする請求項１から請求項４のい
ずれかに記載の移動体通信システム。5. The retransmission control means sets the retransmission transmission power according to the degree of deterioration of downlink communication quality from the radio base station. The mobile communication system described.
らの下り通信品質の劣化に従って前記再送回数を増加さ
せると共に前記再送時間間隔を短くし、更に前記再送送
信電力を増加させることを特徴とする請求項５記載の移
動体通信システム。6. The retransmission control means increases the number of retransmissions as the downlink communication quality from the radio base station deteriorates, shortens the retransmission time interval, and further increases the retransmission transmission power. The mobile communication system according to claim 5.
の下り通信品質の劣化の程度を判定するための閾値を記
憶する閾値記憶手段を具備し、前記無線移動局の再送制
御手段は、前記無線基地局からの下り通信品質が前記閾
値記憶手段に記憶されている閾値以下になると再送制御
を開始することを特徴とする請求項１から請求項６のい
ずれかに記載の移動体通信システム。7. The wireless mobile station comprises threshold storage means for storing a threshold for judging the degree of deterioration of downlink communication quality from the wireless base station, and the retransmission control means of the wireless mobile station comprises: 7. The mobile communication system according to claim 1, wherein when the downlink communication quality from the radio base station becomes equal to or lower than a threshold value stored in the threshold value storage means, retransmission control is started. .
ロトコルのレイヤ２又はレイヤ３の無線制御データを送
信する無線通信制御方法であって、前記無線基地局から
の下り通信品質の劣化の程度に応じて前記無線移動局に
て無線制御データの再送が必要な場合、前記下り通信品
質が劣化するに従って前記無線制御データを再送する回
数を増加させると共に再送時間間隔を短く、更に前記無
線制御データの再送回数を増加させても通信ができない
場合には前記無線制御データの再送回数に応じて送信電
力を段階的に増加させることを特徴とする無線通信制御
方法。8. A radio communication control method for transmitting radio control data of layer 2 or layer 3 of a radio communication protocol from a radio mobile station to a radio base station, the degree of deterioration of downlink communication quality from the radio base station. When it is necessary to retransmit the radio control data in the radio mobile station according to, the number of times of retransmitting the radio control data is increased and the retransmission time interval is shortened as the downlink communication quality deteriorates, and the radio control data is further reduced. If the communication is not possible even if the number of retransmissions is increased, the transmission power is increased stepwise according to the number of retransmissions of the wireless control data.
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| JP2002119528A JP4015877B2 (en) | 2002-04-22 | 2002-04-22 | Mobile communication system and radio communication control method |
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