JPH0795866B2 - Channel allocation method - Google Patents
Channel allocation methodInfo
- Publication number
- JPH0795866B2 JPH0795866B2 JP3291843A JP29184391A JPH0795866B2 JP H0795866 B2 JPH0795866 B2 JP H0795866B2 JP 3291843 A JP3291843 A JP 3291843A JP 29184391 A JP29184391 A JP 29184391A JP H0795866 B2 JPH0795866 B2 JP H0795866B2
- Authority
- JP
- Japan
- Prior art keywords
- channel
- transmission power
- base station
- communication
- frequency
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 57
- 238000004891 communication Methods 0.000 claims description 34
- 238000010295 mobile communication Methods 0.000 claims description 8
- 230000001413 cellular effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明はＴＤＭＡまたはＴＤＭ
またはＴＤＤ方式のセルラー移動通信システムにおける
周波数利用効率の向上に関するものである。BACKGROUND OF THE INVENTION The present invention relates to TDMA or TDM.
Alternatively, the present invention relates to improvement of frequency utilization efficiency in a TDD cellular mobile communication system.
【０００２】[0002]
【従来の技術】最近、陸上移動通信の分野においては、
セル方式の移動通信システムの開発が進められている。
ところで、このような陸上移動通信の利用に適した電波
の周波数には限りがあるため、周波数利用効率の高い陸
上移動通信システムの出現が期待されている。このよう
なセルラー移動通信システムにおける周波数利用効率向
上の１方法として、基地局及び移動局で行う送信電力制
御がある。2. Description of the Related Art Recently, in the field of land mobile communication,
Cell-based mobile communication systems are under development.
By the way, since the frequency of the radio wave suitable for the use of such land mobile communication is limited, the emergence of a land mobile communication system with high frequency utilization efficiency is expected. One method for improving the frequency utilization efficiency in such a cellular mobile communication system is transmission power control performed by a base station and a mobile station.
【０００３】移動局はセル内の任意の位置に存在するた
め、移動局と基地局の間の伝搬損が各移動局で異なる。
このため基地局での受信器入力電圧が一定となるように
移動局では送信電力を制御する。また逆に基地局では移
動局の受信器入力電圧が一定となるように基地局の送信
電力を制御する。これにより同一チャネル干渉の低減と
消費電力の低減を図ることができる。Since the mobile station is located at an arbitrary position in the cell, the propagation loss between the mobile station and the base station is different for each mobile station.
Therefore, the mobile station controls the transmission power so that the receiver input voltage at the base station becomes constant. Conversely, the base station controls the transmission power of the base station so that the receiver input voltage of the mobile station becomes constant. This makes it possible to reduce co-channel interference and power consumption.
【０００４】しかしＴＤＭ方式等で、送信電力制御を行
う場合、タイムスロット毎に送信電力が異なるため自局
宛のタイムスロットでしかクロックの再生ができない。
また送信電力が隣接タイムスロット及び隣接周波数スロ
ットで異なるため、干渉保護のためのガードタイムまた
はガード周波数が必要となる。図１を用いてこれを説明
する。図１はＴＤＭ方式で基地局から移動局へ信号を伝
送する場合の周波数と時間の関係である。通信チャネル
Ａ１０の隣接タイムスロット１１及び１２または隣接周
波数スロット１３及び１４の送信電力がきわめて大きく
（当該タイムスロット及び周波数スロットを受信する移
動局がセルの周辺部に存在する場合）、かつ、通信チャ
ネルＡ１０の送信電力が小さい場合（通信チャネルＡ１
０を受信する移動局が基地局の近傍に存在する場合）、
通信チャネルＡ１０は隣接タイムスロットまたは隣接周
波数スロットから信号の漏れ込みにより干渉妨害を受け
る。これを防ぐには干渉保護のためのガードタイムまた
はガード周波数が必要となる。またセル周辺部に存在す
る移動局には通信チャネルＡ１０の信号が到達しないた
めＡ１０の信号を用いてクロック再生を行うことができ
ない。However, when the transmission power is controlled by the TDM system or the like, the transmission power is different for each time slot, so that the clock can be reproduced only in the time slot addressed to the own station.
Further, since the transmission power is different between the adjacent time slot and the adjacent frequency slot, a guard time or a guard frequency for interference protection is required. This will be described with reference to FIG. FIG. 1 shows the relationship between frequency and time when a signal is transmitted from a base station to a mobile station by the TDM method. The transmission power of the adjacent time slots 11 and 12 or the adjacent frequency slots 13 and 14 of the communication channel A10 is extremely large (when the mobile station that receives the time slot and the frequency slot exists in the periphery of the cell), and the communication channel When the transmission power of A10 is low (communication channel A1
If the mobile station receiving 0 is in the vicinity of the base station),
The communication channel A10 is interfered with by a signal leak from an adjacent time slot or an adjacent frequency slot. To prevent this, a guard time or a guard frequency for interference protection is required. Further, since the signal of the communication channel A10 does not reach the mobile station existing in the peripheral portion of the cell, clock reproduction cannot be performed using the signal of A10.
【０００５】[0005]
【発明が解決しようとする課題】以上述べたように、移
動通信の分野にあっては、通信システムで送信電力制御
を行った場合で、隣接タイムスロット及び周波数スロッ
トからの干渉がある。これを低減する、周波数利用効率
の高いチャネル割当法の開発が要請される。As described above, in the field of mobile communication, there is interference from adjacent time slots and frequency slots when transmission power control is performed in the communication system. It is required to develop a channel allocation method that reduces this and has high frequency utilization efficiency.
【０００６】この発明は上記の事情に鑑みてなされたも
ので、送信電力制御を行った場合であっても隣接タイム
スロット及び隣接周波数スロットからの干渉の発生を回
避できる通信システムを容易に提供することを目的とす
る。The present invention has been made in view of the above circumstances, and easily provides a communication system capable of avoiding occurrence of interference from adjacent time slots and adjacent frequency slots even when transmission power control is performed. The purpose is to
【０００７】[0007]
【課題を解決するための手段】本発明は、送信電力制御
を行うＴＤＭＡまたはＴＤＭまたはＴＤＤ方式の、基地
局から移動局への通信チャネルの割当において、基地局
送信電力の順に、通信チャネルを連続的または間欠的に
割り当てることを特徴とする。隣接タイムスロット及び
隣接周波数スロットからの干渉の発生の回避法を、通信
チャネルの割当て法の工夫により実現した。According to the present invention, in assigning a communication channel from a base station to a mobile station in a TDMA, TDM or TDD system for controlling transmission power, the communication channels are continuously arranged in the order of base station transmission power. It is characterized in that it is allocated either intermittently or intermittently. A method of avoiding interference from adjacent time slots and adjacent frequency slots has been realized by devising a communication channel allocation method.
【０００８】[0008]
【作用】上記割当法によれば、基地局の送信電力は周波
数の高い順または低い順に並べられる。また同一周波数
スロットの場合には、タイムスロットの時間の早い順ま
たは遅い順に並べられる。また、新たに移動局と通信を
行う場合には「請求項２」により、上記送信電力と通信
チャネルの関係は維持される。基地局の送信電力を変更
する場合には「請求項３」により、上記送信電力と通信
チャネルの関係は維持される。According to the above allocation method, the transmission powers of the base stations are arranged in order of increasing frequency or decreasing frequency. In the case of the same frequency slot, the time slots are arranged in ascending or descending order of time. Further, when newly communicating with the mobile station, the relationship between the transmission power and the communication channel is maintained according to "claim 2". When changing the transmission power of the base station, the relation between the transmission power and the communication channel is maintained according to "claim 3".
【０００９】[0009]
【実施例】以下、この発明の実施例について図面を参照
して詳細に説明する。なお以下の説明では主にＴＤＭＡ
またはＴＤＭのタイムスロットへのチャネル割当につい
て説明しているが、周波数スロットへのチャネル割当に
ついても同様に本発明を適用することができる。すなわ
ち以下の説明で、タイムスロットを周波数スロットに、
時間を周波数に読みかえることにより周波数スロットへ
のチャネル割当を行うことができる。Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, mainly TDMA
Alternatively, although channel allocation to time slots of TDM has been described, the present invention can be similarly applied to channel allocation to frequency slots. That is, in the following description, time slots are frequency slots,
Channels can be assigned to frequency slots by replacing time with frequency.
【００１０】図２は本発明のチャネル割当方式の１実施
例による周波数と送信電力の関係を示すグラフである。
図２中の縦棒は各通信チャネルの送信電力でを示す。基
地局から移動局へ送信される送信電力の順に、通信チャ
ネルを、時間的に連続的または間欠的に割り当てること
により、割り当てられたチャネルの送信電力と、割り当
てたチャネルに隣接するタイムスロットとの送信電力と
の差が小さくなる。このためチャネル間の干渉が減少す
る。またチャネルＥ２４を用いる受信局ではチャネルＡ
２０からチャネルＥ２４までの全ての信号を用いてクロ
ック再生を行える。FIG. 2 is a graph showing the relationship between frequency and transmission power according to an embodiment of the channel allocation system of the present invention.
The vertical bar in FIG. 2 indicates the transmission power of each communication channel. By sequentially or intermittently allocating communication channels in order of transmission power transmitted from the base station to the mobile station, the transmission power of the allocated channel and the time slot adjacent to the allocated channel The difference from the transmission power becomes smaller. This reduces interference between channels. In the receiving station using the channel E24, the channel A
Clock recovery can be performed using all signals from 20 to channel E24.
【００１０】なお、チャネルＢ２１とチャネルＤ２３の
間に使用されていない空きチャネルＣ２２が存在する。
これは、新たにチャネルを移動局にチャネルを割り当て
る場合、割り当てる移動局のための基地局の送信電力
に、最も近い基地局送信電力を有するタイムスロット
の、使用していないチャネルを、移動局のために割り当
てられるようにするための空タイムスロットである。There is an unused channel C22 between the channel B21 and the channel D23.
This means that when a channel is newly assigned to a mobile station, the unused channel of the time slot having the base station transmission power closest to the transmission power of the base station for the mobile station to be assigned is set to the unused channel of the mobile station. It is an empty time slot so that it can be allocated for.
【００１１】新たに移動局にチャネルを割り当てる場合
の説明を図３を用いて行う。図３は本発明のチャネル割
当方式で新たにチャネルを割り当てる場合の１実施例に
よる周波数と送信電力の関係を示すグラフである。新た
に移動局にチャネルを割り当てる場合に、当該移動局の
ための基地局の送信電力レベル３０には、最も近い基地
局送信電力を有する通信チャネル３１に、最も近いタイ
ムスロットを有する、使用していないチャネル３２を、
移動局のために割り当てる。A case of newly allocating a channel to a mobile station will be described with reference to FIG. FIG. 3 is a graph showing a relationship between frequency and transmission power according to an embodiment when a channel is newly allocated by the channel allocation method of the present invention. When a channel is newly assigned to a mobile station, the base station transmission power level 30 for the mobile station is used, which has the closest time slot to the communication channel 31 having the closest base station transmission power. Not the channel 32,
Allocate for mobile stations.
【００１２】既に通信中のチャネルの基地局送信電力を
変更する場合の、手順について図４を用いて説明する。
図４は本発明のチャネル割当方式で基地局送信電力を変
更する場合の１実施例による周波数と送信電力の関係を
示すグラフである。図４（ａ）は送信電力変更前のグラ
フであり、図４（ｂ）は送信電力変更後のグラフであ
る。A procedure for changing the base station transmission power of a channel already in communication will be described with reference to FIG.
FIG. 4 is a graph showing the relationship between frequency and transmission power according to an embodiment when the base station transmission power is changed by the channel allocation method of the present invention. FIG. 4A is a graph before changing the transmission power, and FIG. 4B is a graph after changing the transmission power.
【００１３】図４（ａ）において通信中のチャネル４１
の基地局送信電力を変更する場合、基地局送信電力を変
更するとともに、基地局の電力値変更後の送信電力４０
に、最も近い基地局送信電力を有する通信チャネル４２
に、最も近いタイムスロットを有する、使用していない
チャネル４３に、通信チャネルを変更する。Channel 41 in communication in FIG.
When changing the transmission power of the base station, the transmission power of the base station is changed and the transmission power of the base station after the power value is changed
The communication channel 42 with the closest base station transmit power to
Then, the communication channel is changed to the unused channel 43 having the closest time slot.
【００１４】図４（ｂ）は送信電力と通信チャネル変更
後のチャネル状態図である。チャネル４１は空きチャネ
ルとなり、代わって図４（ａ）で空きチャネルであった
４３が適正な送信電力で当該移動局のために使用され
る。これにより、例えば移動局が通信開始時と大幅に異
なる地点に移動することにより、基地局送信電力を変更
しなければならない場合であっても、隣接タイムスロッ
トからの干渉を回避することができる。FIG. 4B is a channel state diagram after changing the transmission power and the communication channel. The channel 41 becomes an idle channel, and instead, the idle channel 43 in FIG. 4A is used for the mobile station with appropriate transmission power. This makes it possible to avoid interference from adjacent time slots even when the base station transmission power has to be changed by, for example, moving the mobile station to a point that is significantly different from the start of communication.
【００１５】[0015]
【発明の効果】以上詳述したように、この発明によれ
ば、基地局で送信電力制御を行った場合においても、隣
接タイムスロット及び周波数スロットからの干渉を回避
しつつ、容易に通信チャネルの割当と変更を行うことが
できる。As described above in detail, according to the present invention, even when the transmission power control is performed by the base station, the interference from the adjacent time slot and the frequency slot can be avoided and the communication channel can be easily controlled. Can be assigned and changed.
【図１】ＴＤＭ方式で基地局から移動局へ信号を伝送す
る際の周波数と時間の関係図FIG. 1 is a relationship diagram of frequency and time when a signal is transmitted from a base station to a mobile station by the TDM method.
【図２】本発明のチャネル割当方式の１実施例による周
波数と送信電力の関係を示すグラフであるFIG. 2 is a graph showing the relationship between frequency and transmission power according to an embodiment of the channel allocation system of the present invention.
【図３】本発明のチャネル割当方式で新たにチャネルを
割り当てる場合の１実施例による周波数と送信電力の関
係を示すグラフであるFIG. 3 is a graph showing a relationship between frequency and transmission power according to an embodiment when a channel is newly allocated by the channel allocation method of the present invention.
【図４】本発明のチャネル割当方式で基地局送信電力を
変更する場合の１実施例による周波数と送信電力の関係
を示すグラフであるFIG. 4 is a graph showing a relationship between frequency and transmission power according to an embodiment when base station transmission power is changed by the channel allocation method of the present invention.
１０…チャネルＡ、１１…隣接タイムスロット、１２…
隣接タイムスロット、１３…隣接周波数スロット、１４
…隣接周波数スロット、２０…チャネルＡ、２１…チャ
ネルＢ、２２…チャネルＣ、２３…チャネルＤ、２４…
チャネルＥ、２５…チャネルＦ、２６…チャネルＧ、３
０…新たな移動局のための基地局の送信電力レベル、３
１…新たな移動局のための基地局の送信電力レベルに最
も近い送信電力を有するチャネル、３２…使用していな
いチャネル（新たに使用される）、４０…電力値変更後
の送信電力、４１…送信電力を変更する通信チャネル、
４２…電力値変更後の送信電力に最も近い送信電力を有
する通信チャネル、４３…使用していないチャネル（新
たに使用される）10 ... Channel A, 11 ... Adjacent time slots, 12 ...
Adjacent time slots, 13 ... Adjacent frequency slots, 14
... Adjacent frequency slots, 20 ... Channel A, 21 ... Channel B, 22 ... Channel C, 23 ... Channel D, 24 ...
Channel E, 25 ... Channel F, 26 ... Channel G, 3
0 ... Base station transmit power level for new mobile station, 3
1 ... Channel having transmission power closest to base station transmission power level for new mobile station, 32 ... Unused channel (newly used), 40 ... Transmission power after power value change, 41 ... a communication channel that changes the transmission power,
42 ... Communication channel having transmission power closest to transmission power after power value change, 43 ... Channel not used (newly used)
Claims (3)
用い、複数のタイムスロットと複数の周波数スロットか
ら構成される、複数の通信チャネルを有する、送信電力
制御を行う基地局と、複数の移動局とからなる、移動通
信システムの、基地局から移動局への通信の通信チャネ
ル割当において、 前記基地局から移動局へ送信される送信電力の順に、通
信チャネルを、 周波数的にまたは時間的に連続的または間欠的に割り当
てることにより、 割り当てたチャネルの送信電力と、割り当てたチャネル
に隣接するタイムスロットおよび隣接周波数スロットと
の送信電力との差が小さいことを特徴とするチャネル割
当方式。1. A base station for controlling transmission power, which has a plurality of communication channels and is composed of a plurality of time slots and a plurality of frequency slots, and which uses a TDMA, TDM or TDD system, and a plurality of mobile stations. In the mobile communication system, in the communication channel allocation of the communication from the base station to the mobile station, in the order of the transmission power transmitted from the base station to the mobile station, the communication channels are continuous in frequency or time or A channel allocation method characterized by a small difference between the transmission power of the allocated channel and the transmission power of the time slot and the adjacent frequency slot adjacent to the allocated channel by performing the intermittent allocation.
たに移動局にチャネルを割り当てる場合、 基地局から前項の移動局への基地局送信電力に、最も近
い基地局送信電力を有する通信チャネルに、 最も近い周波数またはタイムスロットを有する、使用し
ていないチャネルを、移動局のために割り当てるチャネ
ル割当方式。2. The channel allocation method according to claim 1, wherein when a channel is newly allocated to a mobile station, a communication channel having a base station transmission power closest to the base station transmission power from the base station to the mobile station according to the preceding paragraph is selected. , A channel allocation scheme that allocates an unused channel with the closest frequency or time slot for a mobile station.
信中のチャネルの基地局送信電力を変更する場合、 前項の通信中のチャネルの基地局送信電力を変更すると
ともに、 電力値変更後の送信電力に、最も近い基地局送信電力を
有する通信チャネルに、 最も近い周波数またはタイムスロットを有する、使用し
ていないチャネルに、通信チャネルを変更するチャネル
割当方式。3. The channel allocation method according to claim 1, wherein when changing the base station transmission power of the channel in communication, the base station transmission power of the channel in communication of the preceding paragraph is changed and the transmission after the power value change is made. A channel allocation scheme that changes the communication channel to the unused communication channel that has the closest frequency or time slot to the communication channel that has the closest base station transmit power to the power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3291843A JPH0795866B2 (en) | 1991-08-20 | 1991-08-20 | Channel allocation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3291843A JPH0795866B2 (en) | 1991-08-20 | 1991-08-20 | Channel allocation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0548521A JPH0548521A (en) | 1993-02-26 |
| JPH0795866B2 true JPH0795866B2 (en) | 1995-10-11 |
Family
ID=17774141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3291843A Expired - Lifetime JPH0795866B2 (en) | 1991-08-20 | 1991-08-20 | Channel allocation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0795866B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2616244B2 (en) * | 1993-05-18 | 1997-06-04 | 日本電気株式会社 | Channel allocation method for mobile communication system |
| US5579306A (en) * | 1994-09-01 | 1996-11-26 | Ericsson Inc. | Time and frequency slot allocation system and method |
| DE19608183A1 (en) * | 1996-03-04 | 1997-09-18 | Siemens Ag | Method and arrangement for improving the utilization of telecommunication channels in locally concentrated, asynchronous, wireless telecommunication systems |
| JP4829049B2 (en) * | 2006-08-30 | 2011-11-30 | 京セラ株式会社 | Wireless communication method and wireless base station |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2516998B2 (en) * | 1987-08-27 | 1996-07-24 | 松下電器産業株式会社 | Wireless communication equipment |
-
1991
- 1991-08-20 JP JP3291843A patent/JPH0795866B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0548521A (en) | 1993-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4268721B2 (en) | Time slot allocation method and apparatus | |
| EP0517828B1 (en) | Hopped-carrier dynamic frequency reuse | |
| US6584084B1 (en) | Expanded carrier capacity in a mobile communications system | |
| JP3955680B2 (en) | Radio channel access method in mobile communication system of time division communication system, base station and mobile station using the method | |
| US5583870A (en) | Dummy burst structure in a cellular digital radio-communications system using the TDMA principle, and a base station for generating such a structure | |
| US5774790A (en) | Sectorized cellular mobile radio system with sector signalling and control in predetermined time slots | |
| JP3000974B2 (en) | Frequency carrier allocation method for cellular system | |
| JPH08322078A (en) | Time division multiplex communication control method | |
| EP1229671A2 (en) | Time slot allocating apparatus, time slot allocating method thereof, memories and programms, mobile communication system and operating method | |
| JP2002111627A (en) | Cellular communication system and information transmission method | |
| DE69919574D1 (en) | ACCESS PROCEDURE FOR MOBILE COMMUNICATION SYSTEM | |
| WO1997012451A1 (en) | A method of supporting extended range in a tdma system | |
| CA2248515A1 (en) | An asymmetric multiple access protocol for a communications system | |
| US6944146B1 (en) | Communications of signaling in a mobile communications system with reduced interference | |
| GB2376602A (en) | A method for providing a communications channel in Time Division Duplexing (TDD) mode between a TDD mobile and a TDD base station | |
| CA2294915A1 (en) | Method and arrangement for effective radio transmission of data | |
| US5838673A (en) | Radio telephone system for minimizing co-channel interference utilizing geographic separation of signals and transmission power control | |
| EP1122895A1 (en) | Time division duplex cellular communications system with dynamic slot allocation and reduced interference | |
| JP2959288B2 (en) | Mobile communication method and device | |
| JPH0795866B2 (en) | Channel allocation method | |
| WO1995017048A1 (en) | Radio telephone system for minimizing co-channel interference utilizing geographic separation of signals and transmission power control | |
| JP3231903B2 (en) | Channel assignment method | |
| EP1073217A2 (en) | Time slot assignment method | |
| JPH04220821A (en) | Position registration control system in mobile communication | |
| JP3231904B2 (en) | Channel assignment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |