JPH10247887A - Channel quality managing method/device - Google Patents

Channel quality managing method/device

Info

Publication number
JPH10247887A
JPH10247887A JP6555897A JP6555897A JPH10247887A JP H10247887 A JPH10247887 A JP H10247887A JP 6555897 A JP6555897 A JP 6555897A JP 6555897 A JP6555897 A JP 6555897A JP H10247887 A JPH10247887 A JP H10247887A
Authority
JP
Japan
Prior art keywords
switching
time slot
quality
communication
terminal
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
Application number
JP6555897A
Other languages
Japanese (ja)
Other versions
JP3460133B2 (en
Inventor
Yoshiharu Satou
嬉珍 佐藤
Ryotaro Nakanishi
亮太郎 中西
Takehiro Nishikawa
武裕 西川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP06555897A priority Critical patent/JP3460133B2/en
Publication of JPH10247887A publication Critical patent/JPH10247887A/en
Application granted granted Critical
Publication of JP3460133B2 publication Critical patent/JP3460133B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To improve communication quality by switching time slots by the number of idle time slots of a switch destination among the time slots, where quality deterioration occurs. SOLUTION: In a control station, a trnasmission/reception part 10 transmits/ receives a signal and a reception signal quality measuring part 12 monitors communication quality. A switch priority deciding part 14 decides switch priority, based on a result measured by the reception signal quality measuring part 12. A signal-processing part 18 processes switch priority or the message of the instruction of the time slot of the switch destination. A time slot control part 16 manages the use situation of the time slot, dynamically allocates the necessary time slot by the request of a user such as the start of new communication or the switch of the time slot and instructs the time slot which can be used for a terminal. In a bi-directional communication, communication quality can be monitored on a terminal-side and a control station-side.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はTDMA(Time
Division Multipule Acces
s)通信におけるチャネル品質管理方法および装置に関
する。本発明は通信中に通信品質が劣化した場合に通信
品質を改善する技術に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to TDMA (Time
Division Multiple Accesses
s) A method and apparatus for managing channel quality in communication. The present invention relates to a technique for improving communication quality when communication quality deteriorates during communication.

【0002】[0002]

【従来の技術】近年、アクセス系無線通信において、マ
ルチメディアサービスが注目されている。マルチメディ
ア無線通信では、サービスに応じて伝送速度を可変にし
たサービスを提供することにより周波数利用効率を向上
させる。TDMA方式では、伝送速度を可変にするため
に、1ユーザに割り当てるチャネルの数をユーザ情報速
度に応じて変え、マルチメディア通信を実現できる。一
方、TDMA方式では、通信中に品質劣化が生じた場
合、使用中のタイムスロットを他のタイムスロットに切
り替えることによりユーザに対する通信品質を維持でき
る。
2. Description of the Related Art In recent years, multimedia services have gained attention in access wireless communication. In multimedia wireless communication, frequency utilization efficiency is improved by providing a service with a variable transmission rate according to the service. In the TDMA system, multimedia transmission can be realized by changing the number of channels assigned to one user in accordance with the user information speed in order to make the transmission speed variable. On the other hand, in the TDMA system, when quality degradation occurs during communication, communication quality for a user can be maintained by switching a used time slot to another time slot.

【0003】[0003]

【発明が解決しようとする課題】1ユーザが複数のチャ
ネルを使用する場合、従来は通信品質の劣化により切替
が必要なタイムスロット全部を他のタイムスロットに切
り替えていた。このため、切替元タイムスロットの数よ
り切替先となりうる空きタイムスロット数が少ない場合
は、品質劣化が生じた全タイムスロットが切り替わるこ
となく、通信を継続することになり、通信品質の維持が
困難になる。
In the case where one user uses a plurality of channels, all the time slots that need to be switched due to deterioration of communication quality have been switched to other time slots. Therefore, if the number of available time slots that can be a switching destination is smaller than the number of switching source time slots, communication is continued without switching all the time slots in which quality has deteriorated, and it is difficult to maintain communication quality. become.

【0004】本発明は、このような背景において、切替
先となる空きのタイムスロット数に応じて、品質劣化が
発生した切替元タイムスロットを決定することにより、
通信品質の改善を図ることができるチャネル品質管理装
置を提供することを目的とする。
[0004] In such a background, the present invention determines a switching source time slot in which quality degradation has occurred, according to the number of empty time slots to be switched to, and
An object of the present invention is to provide a channel quality management device capable of improving communication quality.

【0005】[0005]

【課題を解決するための手段】本発明は、品質劣化が発
生したタイムスロットの中から、切替先の空きのタイム
スロットの数だけのタイムスロットを切り替える。好ま
しくは、切替を実施するタイムスロットを決定するため
に切替優先順位を決定する。切替優先順位が決定すれ
ば、その順位に従い、切替先タイムスロット数に相当す
る品質劣化したタイムスロットを切り替える。
According to the present invention, the number of empty time slots to be switched is switched from the time slots in which quality degradation has occurred. Preferably, the switching priority is determined in order to determine a time slot for performing the switching. When the switching priority is determined, the time slots with the deteriorated quality corresponding to the number of the switching destination time slots are switched according to the priority.

【0006】[0006]

【発明の実施の形態】本発明の実施例の構成を図1に示
す。
FIG. 1 shows the configuration of an embodiment of the present invention.

【0007】本発明は、サービスに応じてタイムスロッ
トの数をダイナミックに可変に割り当てるTDMA通信
システムであり、使用チャネルをダイナミックに割り当
てる制御局と割り当てられたタイムスロットを用いて通
信を行う端末で構成される。
The present invention is a TDMA communication system for dynamically variably assigning the number of time slots in accordance with a service, comprising a control station for dynamically allocating channels to be used and a terminal for performing communication using the allocated time slots. Is done.

【0008】制御局は、信号の送信受信を行う送受信部
10、通信品質を監視する受信信号品質測定部12、受
信信号品質測定部により測定された結果に基づいて切替
優先順位を決定する切替優先順位決定部14、切替優先
順位または切替先のタイムスロットの指示などのメッセ
ージを処理する信号処理部18、タイムスロットの使用
状況を管理し新規通信の開始またはタイムスロットの切
替などのユーザの要求により必要なタイムスロットをダ
イナミックに割り当て端末に使用可能なタイムスロット
を指示するタイムスロット制御部16とで構成される。
The control station includes a transmission / reception unit 10 for transmitting and receiving signals, a reception signal quality measurement unit 12 for monitoring communication quality, and a switching priority for determining a switching priority based on a result measured by the reception signal quality measurement unit. The order determination unit 14, a signal processing unit 18 that processes a message such as an instruction of a switching priority order or a time slot of a switching destination, manages the usage status of a time slot, and receives a user request to start a new communication or switch a time slot. A required time slot is dynamically allocated, and the time slot control unit 16 instructs a time slot usable for a terminal.

【0009】端末側は、制御局のタイムスロット制御部
を除いた、送受信部20、受信信号品質測定部22、切
替優先順位決定部24、信号処理部26で構成される。
The terminal comprises a transmitting / receiving unit 20, a received signal quality measuring unit 22, a switching priority determining unit 24, and a signal processing unit 26, excluding the time slot control unit of the control station.

【0010】双方向の通信においては端末側と制御局側
でそれぞれ通信品質を監視することができる。ここで
は、制御局で通信品質の劣化を検出し、制御局で切替元
タイムスロットの優先順位決定および切替先タイムスロ
ットを選定し、端末へ切替指示を送信する場合を制御局
主導型切替とする。逆に端末側で通信品質の劣化を検出
し、制御局へ切替要求を送信する場合を端末主導型切替
とする。
In two-way communication, the communication quality can be monitored on the terminal side and the control station side. Here, when the control station detects the deterioration of the communication quality, the control station determines the priority of the switching source time slot and selects the switching destination time slot, and the case where the switching instruction is transmitted to the terminal is defined as control station-initiated switching. . Conversely, when the terminal detects the deterioration of the communication quality and transmits a switching request to the control station, it is referred to as terminal-initiated switching.

【0011】制御局主導型切替処理手順を図2A、図2
Bに、端末主導型切替処理手順を図3A、図3Bに示
す。
FIG. 2A and FIG.
FIG. 3B shows a terminal-initiated switching procedure in FIGS. 3A and 3B.

【0012】図2Aに示すように、制御局主導型切替処
理において、制御局では、通信中に通信品質の劣化を検
出した場合(31)、受信信号品質測定部にて測定した
結果に基づいて切替優先順位決定部で切替優先順位を決
定する(32)。
As shown in FIG. 2A, in the control station-initiated switching process, when the control station detects the deterioration of the communication quality during communication (31), it based on the result measured by the received signal quality measuring section. The switching priority is determined by the switching priority determiner (32).

【0013】切替優先順位は以下の4つのパラメータか
ら決定する。 (1)データブロック単位の誤り回数 (2)誤り訂正不能の発生回数 (3)誤りビット数 (4)受信信号レベル
The switching priority is determined from the following four parameters. (1) Number of errors per data block (2) Number of times error correction is not possible (3) Number of error bits (4) Received signal level

【0014】(1)は一定ビット数を1単位として1ブ
ロック内に誤りがあるか否かを判定し、測定時間中に何
回誤りとして判定するかをカウントした結果を示す。
(2)は、誤り訂正符号を使用している場合、訂正能力
を越えて誤りが発生し、測定時間中に誤り訂正が不可能
となる回数を示す。(3)は、誤り訂正符号を使用して
いる場合、測定時間中に誤り訂正を行ったビット数を示
す。(4)は、タイムスロットの平均受信レベルを示
す。
(1) shows the result of judging whether or not there is an error in one block by using a certain number of bits as one unit, and counting how many times an error is judged during the measurement time.
(2) shows the number of times that an error occurs beyond the correction capability when the error correction code is used and error correction becomes impossible during the measurement time. (3) indicates the number of bits for which error correction was performed during the measurement time when an error correction code was used. (4) indicates the average reception level of the time slot.

【0015】切替を実施する切替元タイムスロットを選
定するための切替優先順位は、上記の(1)〜(3)の
番号順とし、(1)が最も切替優先順位が高く(3)が
最も低い。また、同じ条件で切替が発生した場合は誤り
回数等品質測定結果の値が大きい程優先順位が高い。
The switching priority for selecting the switching source time slot for performing the switching is in the numerical order of the above (1) to (3), with (1) having the highest switching priority and (3) having the highest switching priority. Low. Further, when the switching occurs under the same condition, the priority is higher as the value of the quality measurement result such as the number of errors is larger.

【0016】さらに、品質測定結果が同じであれば受信
信号レベルの低いタイムスロットを優先順位を高くす
る。
Further, if the quality measurement results are the same, a priority is given to a time slot with a low received signal level.

【0017】受信信号レベルがある一定レベルより小さ
い場合は干渉による品質劣化と考えにくくなるため、タ
イムスロット切替による品質改善は期待できない。従っ
て、この場合は切替を実施しない。
If the received signal level is lower than a certain level, it is unlikely that the quality will be degraded due to interference. Therefore, no switching is performed in this case.

【0018】なお、(1)〜(4)のすべての項目を測
定できなくても1つ以上の項目を測定することによっ
て、優先順位を決めることができる。
Even if all the items (1) to (4) cannot be measured, the priority can be determined by measuring one or more items.

【0019】また空きのタイムスロットに対し干渉の有
無を監視し、使用可能な場合は切替先タイムスロットと
して選定する(34)。切替元タイムスロット、切替優
先順位、切替先タイムスロットを端末へ通知する切替指
示信号を信号処理部および送受信部を介して端末へ送信
する。
The presence or absence of interference is monitored for an empty time slot, and if it is available, it is selected as a switching time slot (34). A switching instruction signal for notifying the terminal of the switching source time slot, the switching priority order, and the switching destination time slot is transmitted to the terminal via the signal processing unit and the transmission / reception unit.

【0020】この後、切替先タイムスロットを用いた通
信を開始するため、新しいタイムスロットの同期確立お
よび切替元タイムスロットの同期切断などの切替処理を
行い(35)、これらの処理が正常に終了した後、切替
完了を通知する切替完了信号を端末から受信(38)す
ることにより切替先タイムスロットを用いた通信を開始
する。切替処理が失敗した場合は端末へ切替失敗を通知
する信号を送信し(37)切替元タイムスロットを用い
て通信を継続する。
Thereafter, in order to start communication using the switching destination time slot, switching processing such as establishing synchronization of a new time slot and disconnecting synchronization of the switching source time slot is performed (35), and these processings are completed normally. After that, the communication using the switching destination time slot is started by receiving (38) the switching completion signal notifying the switching completion from the terminal. When the switching process has failed, the terminal transmits a signal notifying the failure of the switching to the terminal (37) and continues the communication using the switching source time slot.

【0021】端末では、図2Bに示すように、制御局か
ら切替元タイムスロット、切替優先順位、切替先タイム
スロットを通知する切替指示信号の受信(41)によ
り、切替先タイムスロットを用いた通信を開始するた
め、新しいタイムスロットの同期確立、干渉検出および
切替元タイムスロットの同期切断などの切替処理(4
2)を行い、これらの処理が正常に終了した後、切替完
了を通知する切替完了信号を制御局へ送信することによ
り切替先タイムスロットを用いた通信を開始する。切替
処理が失敗した場合は制御局へ切替失敗を通知する信号
を送信し(44)切替元タイムスロットを用いて通信を
継続する。
As shown in FIG. 2B, the terminal receives a switching instruction signal for notifying the switching source time slot, the switching priority order, and the switching destination time slot from the control station (41), and performs communication using the switching destination time slot. Switching process such as establishing synchronization of a new time slot, detecting interference, and disconnecting synchronization of a switching source time slot.
2) is performed, and after these processes are normally completed, a communication using the switching destination time slot is started by transmitting a switching completion signal for notifying the switching completion to the control station. If the switching process has failed, a signal is sent to the control station to notify the switching failure (44), and communication is continued using the switching source time slot.

【0022】図3Aに示すように、端末主導型切替処理
において、制御局では、切替要求信号の受信(51)に
より、空きのタイムスロットに対し干渉の有無を監視
し、使用可能な場合は切替先タイムスロットとして選定
する(52)。端末により指定された切替元タイムスロ
ットおよび切替優先順位、制御局で選定した切替先タイ
ムスロットを端末へ通知する切替指示信号を信号処理部
および送受信部を介して端末へ送信する。切替優先順位
は上記に示すように制御局と同様な考え方に基づき切替
元タイムスロットの切替優先順位を付与することができ
る。
As shown in FIG. 3A, in the terminal-initiated switching process, the control station monitors the presence or absence of interference with an empty time slot by receiving a switching request signal (51). It is selected as the first time slot (52). A switching instruction signal for notifying the terminal of the switching source time slot and the switching priority specified by the terminal and the switching destination time slot selected by the control station is transmitted to the terminal via the signal processing unit and the transmission / reception unit. As described above, the switching priority of the switching source time slot can be assigned to the switching priority based on the same concept as that of the control station.

【0023】この後、切替先タイムスロットを用いた通
信を開始するため、新しいタイムスロットの同期確立お
よび切替元タイムスロットの同期切断などの切替処理
(54)を行い、これらの処理が正常に終了した後、切
替完了を通知する切替完了信号を端末から受信すること
により切替先タイムスロットを用いた通信を開始する。
切替処理が失敗した場合は端末へ切替失敗を通知する信
号を送信し(56)切替元タイムスロットを用いて通信
を継続する。
Thereafter, in order to start communication using the switching destination time slot, switching processing (54) such as establishment of synchronization of a new time slot and disconnection of synchronization of the switching source time slot is performed, and these processings are completed normally. After that, the communication using the switching destination time slot is started by receiving a switching completion signal notifying the switching completion from the terminal.
If the switching process has failed, a signal for notifying the terminal of the failure of the switching is transmitted (56), and communication is continued using the switching source time slot.

【0024】端末では、図3Bに示すように、通信中に
通信品質の劣化を検出した場合(61)受信信号品質測
定部にて測定した結果に基づいて切替優先順位決定部で
切替優先順位を決定する(62)。切替元タイムスロッ
ト、切替優先順位を通知する切替要求信号を制御局へ送
信する(63)。また、制御局から切替元タイムスロッ
ト、切替優先順位、切替先タイムスロットを通知する切
替指示信号の受信(64)により、切替先タイムスロッ
トを用いた通信を開始するため、新しいタイムスロット
の同期確立、干渉検出および切替元タイムスロットの同
期切断などの切替処理(65)を行い、これらの処理が
正常に終了した後、切替完了を通知する切替完了信号を
制御局へ送信(67)することにより切替先タイムスロ
ットを用いた通信を開始する。切替処理が失敗した場合
は制御局へ切替失敗を通知する信号を送信し(68)切
替元タイムスロットを用いて通信を継続する。
In the terminal, as shown in FIG. 3B, when deterioration of communication quality is detected during communication (61), the switching priority is determined by the switching priority determining unit based on the result measured by the received signal quality measuring unit. Determine (62). A switching request signal for notifying the switching source time slot and the switching priority is transmitted to the control station (63). Further, in response to receiving (64) a switching instruction signal for notifying the switching source time slot, the switching priority, and the switching destination time slot from the control station, communication using the switching destination time slot is started, so that synchronization of a new time slot is established. The switching process (65) such as interference detection and synchronization disconnection of the switching source time slot is performed, and after these processes are normally completed, a switching completion signal notifying the completion of switching is transmitted to the control station (67). The communication using the switching destination time slot is started. If the switching process has failed, a signal is sent to the control station to notify the switching failure (68), and communication is continued using the switching source time slot.

【0025】[0025]

【発明の効果】本発明の効果を図4に示す。図4は切替
先として指定できる空きスロット数に対する正規化した
通信品質の向上率を示す。図4より、切替対象となるス
ロットを全部切り替える方式は、切替対象となるスロッ
ト数以上の空きスロット数が存在する場合のみに通信品
質向上が実現できるが、本方式は切り替えられたスロッ
トの通信品質向上により通信品質が向上できることが分
かる。
FIG. 4 shows the effect of the present invention. FIG. 4 shows a normalized communication quality improvement rate with respect to the number of empty slots that can be designated as a switching destination. According to FIG. 4, the method of switching all the slots to be switched can improve the communication quality only when the number of empty slots equal to or more than the number of slots to be switched exists. It can be seen that the communication quality can be improved by the improvement.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例を説明する図である。FIG. 1 is a diagram illustrating an embodiment of the present invention.

【図2A】本発明における制御局主導型切替処理手順の
制御局の説明図である。
FIG. 2A is an explanatory diagram of a control station in a control station-driven switching processing procedure according to the present invention.

【図2B】本発明における制御局主導型切替処理手順の
端末の説明図である。
FIG. 2B is an explanatory diagram of a terminal in a control station-initiated switching processing procedure according to the present invention.

【図3A】本発明における端末主導型切替処理手順の制
御局の説明図である。
FIG. 3A is an explanatory diagram of a control station in a terminal-driven switching processing procedure according to the present invention.

【図3B】本発明における端末主導型切替処理手順の端
末の説明図である。
FIG. 3B is an explanatory diagram of a terminal in a terminal-driven switching processing procedure according to the present invention.

【図4】本発明の効果を説明する図である。FIG. 4 is a diagram illustrating an effect of the present invention.

【符号の説明】[Explanation of symbols]

10、20 送受信部 12、22 受信信号品質測定部 14、24 切替優先順位決定部 16 タイムスロット制御部 18、26 信号処理部 10, 20 transmitting / receiving unit 12, 22 received signal quality measuring unit 14, 24 switching priority order determining unit 16 time slot control unit 18, 26 signal processing unit

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 通信品質が劣化した場合、切替対象とな
る切替元タイムスロットの数と空きタイムスロットとし
て切替先となりうるタイムスロットの数を比較し、切替
元タイムスロット数の方が大きい場合には切替先タイム
スロット数と同じ数の切替元タイムスロットのみを切替
先タイムスロットに切り替えることを特徴とするチャネ
ル品質管理方法。
When the communication quality is degraded, the number of switching source time slots to be switched is compared with the number of time slots that can be switched to as empty time slots, and when the number of switching source time slots is larger, A channel quality management method characterized in that only the same number of switching source time slots as the number of switching destination time slots are switched to the switching destination time slot.
【請求項2】 切替元タイムスロットの通信品質の順位
を決定し、該通信品質の順位に従い通信品質の低いタイ
ムスロットの切替を優先し切替を行うことを特徴とする
請求項1記載のチャネル品質管理方法。
2. The channel quality according to claim 1, wherein the order of the communication quality of the switching source time slot is determined, and switching is performed with priority given to switching of a time slot having a low communication quality according to the order of the communication quality. Management method.
【請求項3】 制御局が信号処理部、タイムスロット制
御部、受信品質測定部、送受信部を有し、 端末が信号処理部、受信信号品質測定部、および送受信
部から構成されるTDMA装置において、 当該制御局および端末の受信品質測定部の通信品質の測
定結果に基づき、通信品質劣化により切替を実施するタ
イムスロットの優先順位を決定する切替優先順位決定部
を制御局および端末の少なくとも一方に有することを特
徴とするチャネル品質管理装置。
3. A TDMA apparatus in which a control station has a signal processing unit, a time slot control unit, a reception quality measurement unit, and a transmission / reception unit, and a terminal includes a signal processing unit, a reception signal quality measurement unit, and a transmission / reception unit. Based on the measurement result of the communication quality of the reception quality measurement unit of the control station and the terminal, the switching priority determination unit that determines the priority of the time slot to perform switching due to communication quality degradation to at least one of the control station and the terminal A channel quality management device comprising:
JP06555897A 1997-03-05 1997-03-05 Channel quality management system Expired - Fee Related JP3460133B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06555897A JP3460133B2 (en) 1997-03-05 1997-03-05 Channel quality management system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06555897A JP3460133B2 (en) 1997-03-05 1997-03-05 Channel quality management system

Publications (2)

Publication Number Publication Date
JPH10247887A true JPH10247887A (en) 1998-09-14
JP3460133B2 JP3460133B2 (en) 2003-10-27

Family

ID=13290464

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06555897A Expired - Fee Related JP3460133B2 (en) 1997-03-05 1997-03-05 Channel quality management system

Country Status (1)

Country Link
JP (1) JP3460133B2 (en)

Also Published As

Publication number Publication date
JP3460133B2 (en) 2003-10-27

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