JPH06268575A - Channel access system for mobile communications system - Google Patents
Channel access system for mobile communications systemInfo
- Publication number
- JPH06268575A JPH06268575A JP5051977A JP5197793A JPH06268575A JP H06268575 A JPH06268575 A JP H06268575A JP 5051977 A JP5051977 A JP 5051977A JP 5197793 A JP5197793 A JP 5197793A JP H06268575 A JPH06268575 A JP H06268575A
- Authority
- JP
- Japan
- Prior art keywords
- mobile terminal
- level
- incoming
- slot
- time slot
- 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.)
- Withdrawn
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]
【産業上の利用分野】本発明は，直接周波数拡散ＣＤＭ
Ａ方式による移動通信システムにおけるチャネルアクセ
ス方式に関するものである。The present invention relates to a direct frequency spread CDM.
The present invention relates to a channel access method in a mobile communication system based on the A method.
【０００２】近年の自動車電話，携帯電話を中心とした
移動通信の普及は著しいものがあり，加入者は急激に増
加している。これらに対し通信に使用できる無線周波数
は有限であるため，周波数の利用効率を上げてシステム
容量を増やすことが急務となっている。その有効な１つ
の手段として直接周波数（スペクトラム）拡散変調を用
いたＣＤＭＡ（Code Division Multiple Access)方式が
検討されている。本発明は，この直接周波数拡散ＣＤＭ
Ａ方式による移動通信システムにおいて，各移動端末か
らの受信信号レベルの差がシステム容量を増加させるう
えでの阻害要因となっている問題の解決を図ったもので
ある。[0002] In recent years, mobile communication centering on car phones and mobile phones has been remarkably widespread, and the number of subscribers is rapidly increasing. On the other hand, since the radio frequency that can be used for communication is limited, it is urgent to increase the frequency utilization efficiency and increase the system capacity. A CDMA (Code Division Multiple Access) method using direct frequency (spread spectrum) modulation is being studied as one effective means. The present invention is based on this direct frequency spread CDM.
In the mobile communication system of the A system, the present invention is intended to solve the problem that the difference in the signal level received from each mobile terminal is an obstacle to increasing the system capacity.
【０００３】[0003]
【従来の技術】図７に従来のＣＤＭＡ方式の移動端末の
構成を示す。図中（ａ）が送信側，（ｂ）が受信側を示
す。送信側（ａ）において，ベースバンド入力信号は変
調器６でＢＰＳＫなどの位相変調を受け，さらにｏ／π
変調器７で拡散符号８を用いてｏ／π変調されることに
よってスペクトルが直接拡散され，電力増幅器９で電力
増幅されてアンテナ１０から送信される。このとき電力
増幅器９において送信電力レベルの制御が行われる。2. Description of the Related Art FIG. 7 shows the configuration of a conventional CDMA mobile terminal. In the figure, (a) shows the transmitting side, and (b) shows the receiving side. On the transmission side (a), the baseband input signal is subjected to phase modulation such as BPSK by the modulator 6, and further o / π
The spectrum is directly spread by being o / π-modulated by the modulator 7 using the spread code 8, and the power is amplified by the power amplifier 9 and transmitted from the antenna 10. At this time, the power amplifier 9 controls the transmission power level.
【０００４】受信側（ｂ）においては，アンテナ１０に
より電波を受信し，受信増幅器１１で増幅した後，ｏ／
π復調器１２において拡散符号８を用いてスペクトルを
逆拡散し，さらに復調器１３で位相復調を行って，ベー
スバンド信号を出力する。On the receiving side (b), the radio wave is received by the antenna 10 and amplified by the reception amplifier 11 before
The π demodulator 12 despreads the spectrum using the spread code 8, and the demodulator 13 performs phase demodulation to output a baseband signal.
【０００５】ここで，各移動端末の拡散符号を異なるも
のにするか，周期をずらしたものにすることにより多重
化が行われる。つまり自局と他局の拡散符号同士が直交
しているならば，自局以外の変調波は雑音とみなされる
ため，同一周波数を同一時間に用いて複数の局が通信す
ることが可能となる。これにより，従来の周波数多重や
時分割多重に加えて符号による多重という軸が１つ増え
るため，システム容量の増大に資することができる。Here, multiplexing is performed by making the spreading code of each mobile terminal different or shifting the cycle. In other words, if the spreading codes of the own station and other stations are orthogonal to each other, modulated waves other than that of the own station are regarded as noise, so multiple stations can communicate using the same frequency at the same time. . As a result, in addition to conventional frequency multiplexing and time division multiplexing, one axis of code multiplexing increases, which can contribute to an increase in system capacity.
【０００６】ところで直接拡散を用いたＣＤＭＡ方式が
有効に機能するためには，受信しようとする周波数帯に
おいて，符号により多重された各局からの変調波が均一
なレベルで到来することが前提となる。もしある局から
の電波だけが強いレベルで来た場合，それを受信しない
者にとっては雑音が増えたことになって，そこの回線品
質が劣化してしまう。これを防ぐため，移動端末から基
地局への送信時には，綿密な送信電力制御を行う必要が
生じる。つまり基地局の近傍に位置する移動端末からの
受信電波のレベルは大きいのでその送信電力を小さくさ
せ，逆に遠方の端末に対しては送信電力を大きくさせ
て，基地局での受信レベルを一定にしなければならな
い。By the way, in order for the CDMA system using direct spreading to function effectively, it is premised that the modulated waves from the respective stations multiplexed by the code arrive at a uniform level in the frequency band to be received. . If only the radio wave from a certain station comes in at a strong level, noise will increase for those who do not receive it, and the line quality there will deteriorate. To prevent this, it is necessary to perform precise transmission power control during transmission from the mobile terminal to the base station. In other words, the level of the radio waves received from mobile terminals located near the base station is high, so the transmission power is reduced, and conversely, the transmission power is increased for distant terminals to keep the reception level at the base station constant. I have to
【０００７】このように端末の送信電力を制御してＣＤ
ＭＡによるシステム容量の増大を図ろうとすると，端末
の送信電力の制御量は８０ｄｂ程度必要になると報告さ
れている。しかし実際の送信機のハード性能を考慮した
場合，８０ｄｂの制御量というのはきわめて非現実的な
値である。たとえば一般的な小型端末のハードでは，量
産等を前提とした場合，２０〜３０ｄｂ程度が実現可能
で適正な電力制御量と考えられるから，ＣＤＭＡ方式に
おいて８０ｄｂの電力制御が必要であることは従来大き
な問題点となっていた。In this way, the CD is controlled by controlling the transmission power of the terminal.
It has been reported that a control amount of the transmission power of the terminal needs to be about 80 db in order to increase the system capacity by the MA. However, considering the actual hardware performance of the transmitter, the control amount of 80 db is a very unrealistic value. For example, in the case of general small terminal hardware, assuming that mass production or the like is possible, it is possible to realize about 20 to 30 db, which is considered to be an appropriate amount of power control. It was a big problem.
【０００８】[0008]
【発明が解決しようとする課題】本発明は，直接周波数
拡散ＣＤＭＡ方式の移動通信システムにおいて，各移動
端末における送信電力の制御量の幅を容易に実現できる
小さい値に抑制してシステムの容量の増大を可能にする
ことを目的としている。DISCLOSURE OF THE INVENTION In the mobile communication system of the direct frequency spread CDMA system, the present invention suppresses the range of the control amount of the transmission power in each mobile terminal to a small value that can be easily realized and reduces the system capacity. The goal is to enable growth.
【０００９】[0009]
【課題を解決するための手段】本発明は，基地局におい
て，同時に送信を行っている各移動端末からの着信レベ
ル間に大きな差がないことが，局間の干渉雑音を低減す
るうえで重要であり，異なる時間帯で送信を行う移動端
末同士からの着信レベル間には大きな差があっても実際
上支障がないことに着目して，各移動端末からのアップ
リンクに対して時分割多重化を行い，各移動端末からの
アップリンクをその着信レベルに応じて近いもの同士を
グループ化し，グループごとに別のタイムスロットに割
り付けられるようにするものである。これにより同じタ
イムスロットのグループに属する各移動端末について
は，基地局への着信レベル差が小さくなるように制御す
る際に必要となる最大制御量は，グループ分割数に応じ
て著しく縮小される。According to the present invention, it is important for reducing interference noise between stations that there is no large difference between incoming levels from mobile terminals transmitting at the same time in a base station. Therefore, focusing on the fact that even if there is a large difference between the incoming levels from mobile terminals transmitting in different time zones, there is no practical problem, and time division multiplexing is performed on the uplink from each mobile terminal. The uplinks from each mobile terminal are grouped into groups that are close to each other according to the incoming level, and each group can be assigned to a different time slot. As a result, the maximum control amount required for controlling each mobile terminal belonging to the same time slot group so that the difference in the incoming level to the base station becomes small is significantly reduced according to the number of group divisions.
【００１０】図１は本発明の原理説明図である。図にお
いて，１は，直接周波数拡散ＣＤＭＡ方式移動通信シス
テムの基地局である。FIG. 1 illustrates the principle of the present invention. In the figure, 1 is a base station of a direct frequency spread CDMA mobile communication system.
【００１１】２−１〜２−ｎは，直接周波数拡散ＣＤＭ
Ａ方式移動通信システムの移動端末である。３は，基地
局１における時分割多重制御部であり，移動端末からの
到来電波（アップリンク）の着信レベルを測定する機能
（ａ）と，移動端末について測定された着信レベルに応
じて近接する着信レベルをもつ移動端末のグループのタ
イムスロットをその移動端末に割り付ける機能（ｂ）
と，割り付けたタイムスロットおよび送信電力の制御量
などの制御情報を移動端末へ通知する機能（ｃ）とを含
む。2-1 to 2-n are direct frequency spread CDMs.
It is a mobile terminal of an A-system mobile communication system. Reference numeral 3 denotes a time division multiplex control unit in the base station 1, which is close to a function (a) for measuring the incoming level of an incoming radio wave (uplink) from the mobile terminal and the incoming level measured for the mobile terminal. A function for allocating a time slot of a group of mobile terminals having an incoming call level to the mobile terminal (b)
And a function (c) of notifying the mobile terminal of control information such as the allocated time slot and control amount of transmission power.
【００１２】４は，各移動端末のアップリンクのグルー
プとタイムスロットを管理するスロット管理テーブルで
ある。各タイムスロットには，たとえば各移動端末から
の着信レベルのダイナミックレンジを分割したそれぞれ
のレベルが基準として割り付けられている。A slot management table 4 manages uplink groups and time slots of each mobile terminal. To each time slot, for example, each level obtained by dividing the dynamic range of the incoming level from each mobile terminal is assigned as a reference.
【００１３】基地局１は，各移動端末２−１〜２−ｎか
らの送信電波を受信すると，時分割多重制御部３により
移動端末ごとに着信レベルを測定し，スロット管理テー
ブル４を参照して，上記の例の場合その移動端末の着信
レベルとの差が最も小さい基準レベルをもつタイムスロ
ットに割り付け，スロット管理テーブル４に登録する。
次にその割り付けたタイムスロットの番号と調整が必要
な送信電力の制御量とを求めて，移動端末へ通知する制
御を行う。この場合，１つのタイムスロットに割り付け
られるアップリンクの数は一定ではなく，動的に変化す
ることになる。When the base station 1 receives the radio waves transmitted from the mobile terminals 2-1 to 2-n, the time division multiplexing control unit 3 measures the incoming level for each mobile terminal and refers to the slot management table 4. In the case of the above example, the time slot having the reference level having the smallest difference from the incoming level of the mobile terminal is allocated and registered in the slot management table 4.
Next, the number of the allocated time slot and the control amount of the transmission power that needs to be adjusted are calculated, and control is performed to notify the mobile terminal. In this case, the number of uplinks assigned to one time slot is not constant but changes dynamically.
【００１４】なお，上記の例の着信レベルのダイナミッ
クレンジを複数分割し，個々のアップリンクをその着信
レベルに対応する分割レベルに割り付けてグループ化す
る方式の代りに，各移動端末からのアップリンクをその
着信レベルの大きさ順に並べて複数分割し，各分割され
たアップリンクのグループを１つのタイムスロットに割
り当てるようにすることもできる。It is to be noted that, instead of the method of dividing the dynamic range of the incoming call level in the above example and allocating each uplink to a division level corresponding to the incoming call level to group the uplinks from the mobile terminals. Can be arranged in the order of the size of the incoming level and divided into a plurality of groups, and each divided group of uplinks can be assigned to one time slot.
【００１５】いずれのグループ分割にしても，１つのタ
イムスロットに割り当てられるアップリンクのグループ
内では，任意のアップリンク間の着信レベル差が移動端
末の送信電力を容易に制御できる値の範囲内となるよう
に分割数が決定される。In any group division, within the group of uplinks assigned to one time slot, the difference in the incoming level between arbitrary uplinks is within the range of the value that can easily control the transmission power of the mobile terminal. The number of divisions is determined so that
【００１６】[0016]
【作用】次に，図２の具体例を用いて本発明の作用を説
明する。ここでは，個々のタイムスロットに割り付けら
れる着信レベルの範囲が固定される場合について示す。Next, the operation of the present invention will be described with reference to the specific example of FIG. Here, the case where the range of the incoming level assigned to each time slot is fixed is shown.
【００１７】各移動端末内の電力増幅器については２０
ｄｂの利得制御が可能であり，基地局における任意の移
動端末からの着信レベルの最大差は８０ｄｂ以内である
ものとする。このため，ここでは４つのタイムスロット
を用いてアップリンクを時間軸で４グループに分割する
時分割多重が行われる。20 for the power amplifier in each mobile terminal
It is assumed that the gain control of db is possible, and the maximum difference of the incoming level from any mobile terminal in the base station is within 80 db. Therefore, here, time division multiplexing is performed in which the uplink is divided into four groups on the time axis using four time slots.
【００１８】図２の（ａ）は，基地局の受信スロットで
あり，４つのスロットのスロット番号は＃１，＃２，＃
３，＃４で示されている。図２の（ｂ），（ｃ），
（ｄ），（ｅ）は，基地局における着信レベル相対値が
０〜２０ｄｂ，２０〜４０ｄｂ，４０〜６０ｄｂ，６０
〜８０ｄｂの端末にそれぞれ割り当てられる送信スロッ
トのタイミングを示している。FIG. 2A shows the receiving slots of the base station, and the slot numbers of the four slots are # 1, # 2, #.
3 and # 4. 2 (b), (c),
In (d) and (e), the incoming level relative value at the base station is 0 to 20 db, 20 to 40 db, 40 to 60 db, 60.
The timings of the transmission slots respectively assigned to the terminals of ˜80 db are shown.
【００１９】任意の受信スロットにおいて，受信された
端末からの電波の着信レベルが測定され，測定された着
信レベルが図２の（ｂ），（ｃ），（ｄ），（ｅ）のい
ずれの着信レベル範囲に入るかが調べられる。その結果
により受信スロットの変更が必要な場合，対応する新し
い送信スロットが端末に対して指定される。The incoming level of the received radio wave from the terminal is measured in any receiving slot, and the measured incoming level is any of (b), (c), (d) and (e) of FIG. It is checked whether it is within the incoming level range. If the result requires a change in the receive slot, a corresponding new transmit slot is designated for the terminal.
【００２０】各アップリンクの着信レベルを大きさ順に
並べてグループ分割する方式の場合は，図２の＃０，＃
１，＃２，＃３の各受信スロットに割り付けられる端末
の数は等しくされる代りに，各受信スロットが受けもつ
着信レベルの範囲は動的に変化することになる。たとえ
ば，各端末が基地局からの比較的狭い距離範囲に集中し
て存在している場合には，基地局における着信レベルの
ばらつきは少なくなる。そのため各端末からのアップリ
ンクは，８０ｄｂよりも狭い最大着信レベル差の範囲内
で４グループに等分割され，各グループが受信スロット
に対応づけられることになる。In the case of the method of arranging the incoming call levels of the respective uplinks in order of size and dividing them into groups, # 0, # in FIG.
Instead of equalizing the number of terminals allocated to each receiving slot of 1, # 2, # 3, the range of the incoming level received by each receiving slot dynamically changes. For example, when the terminals are concentrated in a relatively narrow distance range from the base station, the variation of the incoming call level at the base station is small. Therefore, the uplink from each terminal is equally divided into four groups within the range of the maximum incoming level difference narrower than 80db, and each group is associated with the receiving slot.
【００２１】このようにして，各端末内の送信電力を２
０ｄｂ以内の範囲で制御することにより，８０ｄｂまで
の着信レベル差を容易に補正することができる。In this way, the transmission power in each terminal is reduced to 2
By controlling within the range of 0 db, it is possible to easily correct the incoming call level difference up to 80 db.
【００２２】[0022]
【実施例】図３は，本発明の１実施例による移動端末の
構成図である。図３において，６はＢＰＳＫなどの位相
変調を行う変調器，７は平衡変調器などのｏ／π変調
器，９は電力増幅器，１０はアンテナ，１１は受信増幅
器，１２はｏ／π復調器，１３は復調器，１４は時分割
回路，１５はバースト送信制御用のバーストゲート，１
６は基地局から通知された制御情報を抽出する制御情報
抽出器，１７は制御情報に基づいて時分割回路１４およ
びバーストゲート１５に対してスロット指定を行うスロ
ット指定器，１８は制御情報に基づいて電力増幅器９に
対する送信電力制御を行う送信電力制御器である。FIG. 3 is a block diagram of a mobile terminal according to an embodiment of the present invention. In FIG. 3, 6 is a modulator for performing phase modulation such as BPSK, 7 is an o / π modulator such as a balanced modulator, 9 is a power amplifier, 10 is an antenna, 11 is a receiving amplifier, and 12 is an o / π demodulator. , 13 is a demodulator, 14 is a time division circuit, 15 is a burst gate for controlling burst transmission, 1
6 is a control information extractor for extracting the control information notified from the base station, 17 is a slot designator for designating a slot for the time division circuit 14 and burst gate 15 based on the control information, and 18 is based on the control information. The transmission power controller controls the transmission power for the power amplifier 9.
【００２３】入力データ（ベースバンド信号）は，時分
割回路１４においてスロット指定器１７によって指定さ
れた送信スロットのタイミングで抽出され，変調器６で
位相変調されて，ｏ／π変調器７に送られ，ここで拡散
コード８を用いてスペクトル拡散され，バーストゲート
１５において送信スロットのタイミングでバースト切出
しが行われて，電力増幅器９に入力される。The input data (baseband signal) is extracted at the timing of the transmission slot designated by the slot designating unit 17 in the time division circuit 14, phase-modulated by the modulator 6, and sent to the o / π modulator 7. Then, the spectrum is spread by using the spreading code 8, the burst is cut out at the timing of the transmission slot in the burst gate 15, and the burst signal is input to the power amplifier 9.
【００２４】電力増幅器９は，送信電力制御器１８によ
り制御された利得で電力増幅し，アンテナ１０から電波
送信させる。一方，アンテナ１０から入力された到来電
波の信号は，受信増幅器１１で増幅され，ｏ／π復調器
１２でスペクトル逆拡散されて，復調器１３で復調され
る。制御情報抽出器１６は，復調された信号から制御情
報を取り出し，残りを再生データとして出力する。The power amplifier 9 amplifies the power with the gain controlled by the transmission power controller 18, and transmits the radio wave from the antenna 10. On the other hand, the signal of the incoming radio wave input from the antenna 10 is amplified by the reception amplifier 11, spectrum-spreaded by the o / π demodulator 12, and demodulated by the demodulator 13. The control information extractor 16 extracts control information from the demodulated signal and outputs the rest as reproduction data.
【００２５】図４は，本発明実施例による基地局内の時
分割多重制御部のハード構成図である。図４において，
１９はＭＰＵ，２０はバス，２１はＲＯＭ，２２はチャ
ネルアクセス制御プログラム，２３はＲＡＭ，２４はス
ロット管理テーブル，２５は着信レベル検出器，２６は
Ａ／Ｄ変換器，２７はバッファである。FIG. 4 is a hardware configuration diagram of the time division multiplexing control unit in the base station according to the embodiment of the present invention. In FIG.
Reference numeral 19 is an MPU, 20 is a bus, 21 is a ROM, 22 is a channel access control program, 23 is a RAM, 24 is a slot management table, 25 is an incoming level detector, 26 is an A / D converter, and 27 is a buffer.
【００２６】基地局のＭＰＵ１９は，チャネルアクセス
制御プログラム２２を実行することによって移動端末か
らのアップリンクを時分割多重のタイムスロットに割り
当てる制御を行う。アップリンクの着信レベルは，着信
レベル検出器２５，Ａ／Ｄ変換器２６，バッファ２７を
介して取り込まれ，スロット管理テーブル２４を用いて
のアップリンクのグループ分割あるいは割り当てスロッ
トの変更などの処理が行われる。The MPU 19 of the base station executes the channel access control program 22 to control the uplink from the mobile terminal to the time slot of time division multiplexing. The uplink incoming level is fetched via the incoming level detector 25, the A / D converter 26, and the buffer 27, and processing such as uplink group division using the slot management table 24 or changing the assigned slot is performed. Done.
【００２７】図５は，各スロットに対して基準となる着
信レベル範囲が固定されている本発明の１実施例による
スロット割り当て制御のフロー図である。ここで移動端
末をＵk で表わすものとする（ｋはｎを通信中の移動端
末の台数として，１≦ｋ≦ｎの値をとる）。FIG. 5 is a flow chart of slot allocation control according to an embodiment of the present invention in which a reference incoming level range is fixed for each slot. Here, the mobile terminal is represented by U k (k takes a value of 1 ≦ k ≦ n, where n is the number of mobile terminals in communication).
【００２８】まずスロット割り当て開始とともにｋ＝１
に初期設定し，移動端末Ｕk のアップリンクについて着
信レベルを測定する。次に，現在Ｕk に割り当てられて
いるスロットの着信レベル範囲と比較し，現在のスロッ
トが適合していれば（ＹＥＳ），ｋ＝ｋ＋１に進めて次
の移動端末Ｕ k の着信レベル測定を行う動作に戻り，現
在のスロットが不適合であれば（ＮＯ），スロット管理
テーブルを変更して適切なスロットを割り当てるととも
に，Ｕ k に対して新スロットを通知してからｋ＝ｋ＋１
に進める。以上の動作をｋ≦ｎになるまで繰り返して終
了する。First, when slot allocation starts, k = 1
Mobile terminal UkAbout the uplink
Measure the confidence level. Next, U nowkAssigned to
Current slot range compared to the incoming level range of the current slot.
If yes (YES), proceed to k = k + 1 and go to
Mobile terminal U kReturn to the operation to measure the incoming call level of the
If the current slot is not compatible (NO), slot management
Modifying the table and assigning the appropriate slots
To U kTo the new slot, then k = k + 1
Proceed to. Repeat the above operation until k ≦ n
Finish.
【００２９】図６は，アップリンクを着信レベル順に並
べてグループ分割する本発明の他の１実施例によるスロ
ット割り当て制御のフロー図である。まずｋ＝１に初期
設定してから，移動端末Ｕk の着信レベルを測定する動
作を，ｋ＝ｋ＋１に進めながらｋ≦ｎになるまで繰り返
し，次に各Ｕk を着信レベル値にしたがってソートし，
テーブルを作成する。このテーブルをスロット数Ｎで分
割し，各スロットにｎ／Ｎ局の移動端末のグループを割
り当てる。この割り当て結果を，各移動端末に通知して
終了する。FIG. 6 is a flow chart of slot allocation control according to another embodiment of the present invention, in which uplinks are arranged in order of incoming level and divided into groups. First, the operation for measuring the incoming call level of the mobile terminal U k after initializing k = 1 is repeated until k ≦ n while advancing to k = k + 1, and then each U k is sorted according to the incoming call level value. Then
Create a table. This table is divided by the number of slots N, and a group of mobile terminals of n / N stations is assigned to each slot. This allocation result is notified to each mobile terminal and the processing ends.
【００３０】[0030]
【発明の効果】本発明によれば，ＣＤＭＡによるシステ
ム容量の増大に不可欠な送信電力制御技術において，各
移動端末に要求される電力制御量を大幅に緩和できるた
め，端末機のコストアップを招くことなくＣＤＭＡの利
点を生かすことができる。According to the present invention, in the transmission power control technique that is indispensable for increasing the system capacity by CDMA, the amount of power control required for each mobile terminal can be greatly relaxed, which leads to an increase in the cost of the terminal. Without taking advantage of CDMA.
【図１】本発明の原理説明図である。FIG. 1 is a diagram illustrating the principle of the present invention.
【図２】本発明の作用を説明するスロットのタイミング
図である。FIG. 2 is a slot timing diagram illustrating the operation of the present invention.
【図３】本発明の１実施例による移動端末の構成図であ
る。FIG. 3 is a configuration diagram of a mobile terminal according to an embodiment of the present invention.
【図４】本発明実施例による時分割多重制御部のハード
構成図である。FIG. 4 is a hardware configuration diagram of a time division multiplexing control unit according to the embodiment of the present invention.
【図５】本発明の１実施例によるスロット割り当て制御
のフロー図である。FIG. 5 is a flow chart of slot allocation control according to an embodiment of the present invention.
【図６】本発明の他の１実施例によるスロット割り当て
制御のフロー図である。FIG. 6 is a flow chart of slot allocation control according to another embodiment of the present invention.
【図７】従来のＣＤＭＡ方式の移動端末の構成図であ
る。FIG. 7 is a block diagram of a conventional CDMA mobile terminal.
１ 基地局 ２−１〜２−ｎ 移動端末 ３ 時分割多重制御部 ４ スロット管理テーブル 1 Base Station 2-1 to 2-n Mobile Terminal 3 Time Division Multiplexing Control Unit 4 Slot Management Table
Claims (2)
拡散ＣＤＭＡ方式で通信を行う移動通信システムにおい
て， 各移動端末からのアップリンクを，移動端末における送
信電力が容易に制御できる所定値を単位として着信レベ
ルを複数段階のグループに分割するとともにそれぞれの
グループに１つのタイムスロットを割り当てて時分割多
重し， 基地局では，個々の移動端末からのアップリンクごとに
その着信レベルを測定し，グループ内での着信レベル差
が上記所定値内に入る着信レベルのグループを選択して
対応するタイムスロットに割り付けることを特徴とする
移動通信システムのチャネルアクセス方式。1. In a mobile communication system in which a plurality of mobile terminals and a base station communicate directly with each other in a spread spectrum CDMA system, an uplink from each mobile terminal has a predetermined value with which transmission power at the mobile terminal can be easily controlled. As a unit, the incoming call level is divided into groups of multiple stages, one time slot is assigned to each group, and time division multiplexing is performed. The base station measures the incoming call level for each uplink from each mobile terminal, A channel access method for a mobile communication system, characterized in that a group of incoming levels in which the incoming level difference within the group falls within the predetermined value is selected and assigned to a corresponding time slot.
拡散ＣＤＭＡ方式で通信を行う移動通信システムにおい
て， 基地局では，各移動端末からのアップリンクの着信レベ
ルを測定し，各アップリンクを着信レベル順に並べ，順
番に複数のグループに等分割してそれぞれのグループに
１つのタイムスロットを割り当てて時分割多重し， 上記複数のグループの分割数は，各グループのそれぞれ
においてそこに含まれる移動端末からのアップリンク同
士の着信レベル差が，各移動端末における送信電力が容
易に制御できる所定値の範囲を超えないように決定され
ることを特徴とする移動通信システムのチャネルアクセ
ス方式。2. In a mobile communication system in which a plurality of mobile terminals and a base station communicate with each other in a direct frequency spread CDMA system, the base station measures an uplink incoming level from each mobile terminal and determines each uplink. Arrange in order of incoming level, divide into equal number of groups in order, assign one time slot to each group, and time-division multiplex. The number of divisions of the above groups is the movement included in each group. A channel access method for a mobile communication system, characterized in that a difference in incoming level between uplinks from terminals is determined so as not to exceed a predetermined value range in which transmission power at each mobile terminal can be easily controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5051977A JPH06268575A (en) | 1993-03-12 | 1993-03-12 | Channel access system for mobile communications system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5051977A JPH06268575A (en) | 1993-03-12 | 1993-03-12 | Channel access system for mobile communications system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06268575A true JPH06268575A (en) | 1994-09-22 |
Family
ID=12901933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5051977A Withdrawn JPH06268575A (en) | 1993-03-12 | 1993-03-12 | Channel access system for mobile communications system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06268575A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995027380A1 (en) * | 1994-04-05 | 1995-10-12 | Kabushiki Kaisha Toshiba | Mobile radio communication system |
| WO1998017077A3 (en) * | 1996-10-15 | 1998-06-18 | Nokia Telecommunications Oy | Channel allocation method and radio system using a combination of tdma and cdma |
| WO2000062456A1 (en) * | 1999-04-12 | 2000-10-19 | Samsung Electronics Co., Ltd. | Apparatus and method for gated transmission in a cdma communication system |
| KR100324426B1 (en) * | 2000-01-14 | 2002-02-27 | 박종섭 | Method for changing automatically transmission power of three sector basestation transceiver subsystem in mobile communication system |
| KR100325045B1 (en) * | 1998-05-20 | 2002-03-04 | 가네꼬 히사시 | Radio transmission system and transmission method |
| WO2007077777A1 (en) * | 2005-12-28 | 2007-07-12 | Ntt Docomo, Inc. | Communication system, communication device, communication method, and program |
| WO2007080769A1 (en) * | 2006-01-10 | 2007-07-19 | Mitsubishi Electric Corporation | Scheduling method and base station device |
| WO2009012448A2 (en) * | 2007-07-18 | 2009-01-22 | Marvell World Trade Ltd. | Wireless network with simultaneous uplink transmission of independent data from multiple client stations |
| WO2009119867A1 (en) * | 2008-03-28 | 2009-10-01 | 日本電気株式会社 | Base station, mobile communication system, base station control method, and storage medium |
| US8982889B2 (en) | 2008-07-18 | 2015-03-17 | Marvell World Trade Ltd. | Preamble designs for sub-1GHz frequency bands |
| US9077594B2 (en) | 2009-07-23 | 2015-07-07 | Marvell International Ltd. | Coexistence of a normal-rate physical layer and a low-rate physical layer in a wireless network |
| US9124402B2 (en) | 2007-07-18 | 2015-09-01 | Marvell World Trade Ltd. | Method and apparatus for transmitting first data streams via respective transmitters to multiple clients stations during a same period and successively transmitting second data streams |
| US9584383B2 (en) | 2009-07-23 | 2017-02-28 | Marvell World Trade Ltd. | Coexistence of a normal-rate physical layer and a low-rate physical layer in a wireless network |
-
1993
- 1993-03-12 JP JP5051977A patent/JPH06268575A/en not_active Withdrawn
Cited By (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995027380A1 (en) * | 1994-04-05 | 1995-10-12 | Kabushiki Kaisha Toshiba | Mobile radio communication system |
| GB2293947A (en) * | 1994-04-05 | 1996-04-10 | Toshiba Kk | Mobile radio communication system |
| GB2293947B (en) * | 1994-04-05 | 1998-10-21 | Toshiba Kk | Mobile radio communication system |
| US5914947A (en) * | 1994-04-05 | 1999-06-22 | Kabushiki Kaisha Toshiba | Mobile radio communication system which allocates spread codes mobiles which are able to determine the distance between a mobile and a base station |
| WO1998017077A3 (en) * | 1996-10-15 | 1998-06-18 | Nokia Telecommunications Oy | Channel allocation method and radio system using a combination of tdma and cdma |
| AU727931B2 (en) * | 1996-10-15 | 2001-01-04 | Nokia Telecommunications Oy | Channel allocation method and radio system using a combination of TDMA and CDMA |
| CN1101639C (en) * | 1996-10-15 | 2003-02-12 | 诺基亚电信公司 | Channel allocation method and radio system using a combination of TDMA and CDMA |
| US6535503B1 (en) | 1996-10-15 | 2003-03-18 | Nokia Telecommunications | Channel allocation method and radio system using a combination of TDMA and CDMA |
| KR100325045B1 (en) * | 1998-05-20 | 2002-03-04 | 가네꼬 히사시 | Radio transmission system and transmission method |
| WO2000062456A1 (en) * | 1999-04-12 | 2000-10-19 | Samsung Electronics Co., Ltd. | Apparatus and method for gated transmission in a cdma communication system |
| US6747963B1 (en) | 1999-04-12 | 2004-06-08 | Samsung Electronics Co., Ltd. | Apparatus and method for gated transmission in a CDMA communication system |
| KR100324426B1 (en) * | 2000-01-14 | 2002-02-27 | 박종섭 | Method for changing automatically transmission power of three sector basestation transceiver subsystem in mobile communication system |
| WO2007077777A1 (en) * | 2005-12-28 | 2007-07-12 | Ntt Docomo, Inc. | Communication system, communication device, communication method, and program |
| US8155064B2 (en) | 2005-12-28 | 2012-04-10 | Ntt Docomo, Inc. | Communication system, communication device, communication method, and program |
| WO2007080769A1 (en) * | 2006-01-10 | 2007-07-19 | Mitsubishi Electric Corporation | Scheduling method and base station device |
| WO2009012448A2 (en) * | 2007-07-18 | 2009-01-22 | Marvell World Trade Ltd. | Wireless network with simultaneous uplink transmission of independent data from multiple client stations |
| WO2009012448A3 (en) * | 2007-07-18 | 2009-05-14 | Marvell World Trade Ltd | Wireless network with simultaneous uplink transmission of independent data from multiple client stations |
| US9124402B2 (en) | 2007-07-18 | 2015-09-01 | Marvell World Trade Ltd. | Method and apparatus for transmitting first data streams via respective transmitters to multiple clients stations during a same period and successively transmitting second data streams |
| CN101755498A (en) * | 2007-07-18 | 2010-06-23 | 马维尔国际贸易有限公司 | Wireless network with simultaneous uplink transmission of independent data from multiple client stations |
| US8149811B2 (en) | 2007-07-18 | 2012-04-03 | Marvell World Trade Ltd. | Wireless network with simultaneous uplink transmission of independent data from multiple client stations |
| JP2012249315A (en) * | 2007-07-18 | 2012-12-13 | Marvell World Trade Ltd | Wireless network with simultaneous uplink transmission of independent data from multiple client stations |
| US8958436B2 (en) | 2007-07-18 | 2015-02-17 | Marvell World Trade Ltd. | Wireless network with simultaneous uplink transmission of independent data from multiple client stations |
| US9628246B2 (en) | 2007-07-18 | 2017-04-18 | Marvell World Trade Ltd. | Aggregating acknowledgments transmitted by an access point to a plurality of client stations in a wireless network |
| US9480064B2 (en) | 2007-07-18 | 2016-10-25 | Marvell World Trade Ltd. | Method and apparatus for transmitting first data streams via respective transmitters to multiple client stations during a same period and successively transmitting second data streams |
| US9294249B2 (en) | 2007-07-18 | 2016-03-22 | Marvell World Trade Ltd. | Method and apparatus for aggregating acknowledgments transmitted by an access point to a plurality of client stations in a wireless network |
| WO2009119867A1 (en) * | 2008-03-28 | 2009-10-01 | 日本電気株式会社 | Base station, mobile communication system, base station control method, and storage medium |
| US8982889B2 (en) | 2008-07-18 | 2015-03-17 | Marvell World Trade Ltd. | Preamble designs for sub-1GHz frequency bands |
| US9088466B2 (en) | 2009-07-23 | 2015-07-21 | Marvell World Trade Ltd. | Coexistence of a normal-rate physical layer and a low-rate physical layer in a wireless network |
| US9077594B2 (en) | 2009-07-23 | 2015-07-07 | Marvell International Ltd. | Coexistence of a normal-rate physical layer and a low-rate physical layer in a wireless network |
| US9584383B2 (en) | 2009-07-23 | 2017-02-28 | Marvell World Trade Ltd. | Coexistence of a normal-rate physical layer and a low-rate physical layer in a wireless network |
| US9713065B2 (en) | 2009-07-23 | 2017-07-18 | Marvell World Trade Ltd. | Coexistence of devices operating at different data rates in wireless networks |
| US9860823B2 (en) | 2009-07-23 | 2018-01-02 | Marvell International Ltd. | Method and apparatus for reducing interference between wireless devices operating at different data rates in a wireless network |
| US9706546B2 (en) | 2011-05-16 | 2017-07-11 | Marvell World Trade Ltd. | Preambles for sub-1GHz frequency bands |
| US10178665B2 (en) | 2011-05-16 | 2019-01-08 | Marvell World Trade Ltd | Systems and methods for transmitting packets in sub-1GHz frequency bands |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5210771A (en) | Multiple user spread-spectrum communication system | |
| US6542484B1 (en) | Code allocation for radiocommunication systems | |
| KR100389663B1 (en) | Data transmission within a spread-spectrum communication system | |
| US7421279B2 (en) | Method, system and apparatus for improving reception in multiple access communication systems | |
| US6483816B2 (en) | CDMA communication system and its transmission power control method | |
| US5758090A (en) | Frequency reuse planning for CDMA cellular communication system by grouping of available carrier frequencies and power control based on the distance from base station | |
| US6804214B1 (en) | System and method for implementing multiple carriers in cellular networks | |
| EP1166481B1 (en) | Code reservation for interference measurement in a cdma radiocommunication system | |
| EP0935901B1 (en) | Channel allocation method and radio system using a combination of tdma and cdma | |
| CN100473214C (en) | Movable communication system, base station equipment and movable communication system controlling method | |
| US10334593B2 (en) | Hybrid apparatus using physical channels | |
| US6301289B1 (en) | To a telecommunication system using code division multiple access (CDMA) | |
| CA2756677C (en) | Physical channel configuration signaling procedures | |
| JPH07177569A (en) | Mobile communication equipment | |
| AU2002309736A1 (en) | Physical channel configuration signaling procedures | |
| JPH06268575A (en) | Channel access system for mobile communications system | |
| JPH06276176A (en) | Cdma communication system | |
| US20040047309A1 (en) | Method and base station for power control in TDMA radio system | |
| US20030076874A1 (en) | Reverse synchronization method in a wireless system | |
| US20050025098A1 (en) | Communication system, transmitter of the system, receiver of the system, and physical layer control method | |
| JPH0955974A (en) | Mobile communication equipment | |
| JP2004538713A (en) | Method for supporting variable data rates in a CDMA system | |
| JP2001024581A (en) | Method and device for constituting frame, transmission medium, control of transmission power, and radio station | |
| EP0945997A1 (en) | A communications system and a method of power control therefor | |
| JP2002359608A (en) | Base station and remote station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000530 |