JPH0336343B2 - - Google Patents
Info
- Publication number
- JPH0336343B2 JPH0336343B2 JP58152443A JP15244383A JPH0336343B2 JP H0336343 B2 JPH0336343 B2 JP H0336343B2 JP 58152443 A JP58152443 A JP 58152443A JP 15244383 A JP15244383 A JP 15244383A JP H0336343 B2 JPH0336343 B2 JP H0336343B2
- Authority
- JP
- Japan
- Prior art keywords
- channel
- zone
- communication
- base station
- wireless
- 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
- 238000004891 communication Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 13
- 238000010295 mobile communication Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
Description
【発明の詳細な説明】
本発明は、複数の通信チヤネルを有し、基地局
と移動局とで通信を行う移動通信方式におけるチ
ヤネル制御の方法に関し、通信中のチヤネルでの
干渉妨害を回避する方法に係るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a channel control method in a mobile communication system that has a plurality of communication channels and communicates between a base station and a mobile station, which avoids interference in channels during communication. It is related to the method.
一つの基地局を中心とするゾーンが複数個配置
され、そのゾーンの中の移動局が該基地局と通信
を行うように構成された移動通信方式において
は、同時に通信している他の移動局の影響によ
り、同一チヤネル干渉妨害、隣接チヤネル干渉妨
害等を生じて通信不能となる場合がある。以下、
その一例として、同一チヤネル干渉妨害の場合に
ついて説明する。 In a mobile communication system in which a plurality of zones are arranged around one base station, and mobile stations in each zone are configured to communicate with the base station, other mobile stations that are communicating at the same time This may cause same channel interference, adjacent channel interference, etc., making communication impossible. below,
As an example, a case of same channel interference will be explained.
移動通信方式においては、周波数の有効利用を
図るため、複数個のゾーンを配置し通信を行うと
共に、同一周波数をある距離だけ離し繰返し使用
している。 In mobile communication systems, in order to utilize frequencies effectively, a plurality of zones are arranged for communication, and the same frequency is repeatedly used at a certain distance.
第１図はゾーンの概念図である。第１図におい
てZ1，Z2はゾーン、F1〜F7は各ゾーン内で使用
する周波数、Ｒは同一周波数繰返し距離である。
この繰返し距離Ｒは、陸上移動通信における伝ぱ
ん距離特性により決定される。 FIG. 1 is a conceptual diagram of zones. In FIG. 1, Z 1 and Z 2 are zones, F 1 to F 7 are frequencies used within each zone, and R is the same frequency repetition distance.
This repetition distance R is determined by propagation distance characteristics in land mobile communication.
第２図は陸上移動通信における伝ぱん距離特性
の例を示す図であつて、周波数900MHz、移動局
アンテナ高1.5m、基地局アンテナ高100mの場合
を示しており、下側の曲線が市街地における特性
を示している。 Figure 2 is a diagram showing an example of propagation distance characteristics in land mobile communications, and shows the case where the frequency is 900 MHz, the mobile station antenna height is 1.5 m, and the base station antenna height is 100 m. It shows the characteristics.
例えば移動局が市街地におり、通信接続できる
受信レベルの限界値を56dBμV／ｍ、許容できる
希望波と干渉波の受信レベル比（以下、Ｄ／Ｕと
いう）を20dBとすると第２図よ線ゾーン半径は
５Km、繰返し距離Ｒは25Kmとなる。これは無線基
地局からの距離が５Km以内の移動局とは通信可能
であるが、それ以遠の移動局とは通信不可能とな
ることを示している。 For example, if a mobile station is located in an urban area, and the limit value of the reception level for communication connection is 56 dBμV/m, and the permissible reception level ratio of desired waves to interference waves (hereinafter referred to as D/U) is 20 dB, Figure 2 shows the line zone. The radius is 5 km and the repetition distance R is 25 km. This indicates that it is possible to communicate with mobile stations within 5 km from the wireless base station, but it is impossible to communicate with mobile stations further away.
しかし、移動局が高所等に位置し、無線基地局
と移動局とが見通しとなるような場合の伝ぱん特
性は第２図の自由空間理論値の曲線に近いものと
なる。このような場合には、無線基地局あるいは
移動局から100Km以上離れた場所においても受信
レベルの限界値以上のレベルで受信できるから、
他のゾーンにおいて同一周波数を用いている移動
局あるいは基地局に対して同一チヤネル干渉妨害
を与えることになる。 However, when the mobile station is located at a high place and there is a line of sight between the radio base station and the mobile station, the propagation characteristics are close to the free space theoretical value curve in FIG. In such a case, even at a location more than 100 km away from the wireless base station or mobile station, the signal can be received at a level that is higher than the reception level limit.
This will cause same channel interference to mobile stations or base stations using the same frequency in other zones.
従来はこのため、あるチヤネルを使用する場合
に、妨害波の有無をチエツクして干渉波が一定値
以上ある場合にはこのチヤネルを使用しない方法
がとられていたが、この場合には、使用前には妨
害波レベルが低かつたが、その後高くなつたよう
な場合には対処し得ないという欠点があつた。 For this reason, in the past, when using a certain channel, the presence or absence of interference waves was checked, and if the interference waves exceeded a certain value, the channel was not used. Previously, the level of interference was low, but it had the disadvantage of not being able to deal with situations where it subsequently increased.
本発明は、これらの欠点を除去するため通信チ
ヤネルとは別に待避チヤネルを設け、チヤネル干
渉妨害が発生したときに待避用チヤネルに通信チ
ヤネルを切替えることにより同一チヤネル干渉妨
害の軽減を図るようにしたもので、以下図面につ
いて詳細に説明する。 In order to eliminate these drawbacks, the present invention provides a protection channel separate from the communication channel, and when channel interference occurs, the communication channel is switched to the protection channel, thereby reducing interference caused by the same channel. The drawings will be described in detail below.
第３図は同一チヤネル干渉妨害を説明する図で
あつて、１，１′はゾーン、２，２′は無線基地
局、３，３′は移動局を表わしている。第３図に
おいて、無線基地局２とそのゾーン内にいる移動
局３が通信チヤネルf1で通信中に、他の無線基地
局２′とそのゾーン内にいる移動局３′が上と同じ
チヤネルf1で通信を開始したとする。移動局３お
よび３′が市街地等にいる間は両者間で同一チヤ
ネル干渉妨害は発生しないが、移動局３あるいは
３′が高台等の伝ぱん状態の良い場所に移動した
場合には同一チヤネル干渉妨害が発生し、通信不
能となる。 FIG. 3 is a diagram illustrating co-channel interference, in which 1 and 1' represent zones, 2 and 2' represent radio base stations, and 3 and 3' represent mobile stations. In FIG. 3, while a radio base station 2 and a mobile station 3 in its zone are communicating on communication channel f 1 , another radio base station 2' and a mobile station 3' in its zone are communicating on the same channel f1. Suppose communication is started with f 1 . While mobile stations 3 and 3' are in an urban area, same channel interference does not occur between them, but when mobile station 3 or 3' moves to a place with good propagation, such as on a hill, same channel interference occurs. Interference occurs and communication becomes impossible.
この場合にＤ／Ｕ比の監視等により、同一チヤ
ネル干渉妨害が発生したことを検知し、無線基地
局２と移動局３の通信用チヤネルf1をあらかじめ
定められた待避用チヤネルf0に切り替え、無線基
地局２と移動局３の通信を続行すると共に、無線
基地局２′と移動局３′はf1で通信を続行するか、
無線基地局２′のゾーン内におけるf0と異なる周
波数の待避用チヤネルに切り替えることにより同
一チヤネル干渉妨害を回避することができる。 In this case, by monitoring the D/U ratio, etc., it is detected that same channel interference has occurred, and the communication channel f 1 between the wireless base station 2 and the mobile station 3 is switched to a predetermined evacuation channel f 0. , continue the communication between the radio base station 2 and the mobile station 3, and the radio base station 2' and the mobile station 3' continue the communication at f1 , or
By switching to an escape channel with a frequency different from f 0 within the zone of the radio base station 2', it is possible to avoid same channel interference.
以上、待避用チヤネルを通信用チヤネルとして
使用する場合について述べたが、待避用チヤネル
を恰も制御チヤネルの如く使用して制御する方法
もある。すなわち、同一チヤネル干渉妨害が発生
したときに通信チヤネルから待避用チヤネルに切
り替え、該待避用チヤネルで次に切り替わるべき
通信チヤネルを基地局から移動局に通知して、同
一チヤネル干渉妨害のない通信チヤネルに切り替
える方式である。 The case where the evacuation channel is used as a communication channel has been described above, but there is also a method of controlling the evacuation channel by using it just like a control channel. In other words, when same-channel interference occurs, the communication channel is switched to a standby channel, and the base station notifies the mobile station of the next communication channel to be switched to in the standby channel, thereby creating a communication channel free of co-channel interference. This is a method of switching to
第４図は基地局及び移動局における制御手順の
要部フローチヤートである。通信中の一つのチヤ
ネルのＤ／Ｕ比を測定し、もしＤ／Ｕ比が規定値
以上あればＤ／Ｕ比測定を繰り返す、もしＤ／Ｕ
比が規定値以下であれば待避用チヤネルに切り替
える旨通信の相手方に報知した後待避用チヤネル
に切り替える。 FIG. 4 is a flowchart of the main part of the control procedure in the base station and mobile station. Measure the D/U ratio of one channel during communication, and if the D/U ratio is above the specified value, repeat the D/U ratio measurement.
If the ratio is less than the specified value, the communication partner is notified that the communication channel will be switched to the evacuation channel, and then the channel is switched to the evacuation channel.
以上は一つのチヤネルについての制御手順を述
べたが、本発明はこれに限定されることなく複数
のチヤネルについても同様に適用できる。 Although the control procedure for one channel has been described above, the present invention is not limited to this and can be similarly applied to a plurality of channels.
第５図は本発明の１実施例のブロツク図であつ
て、４は空中線、５は送受共用器、６は受信機、
７は復調回路、８は出力端子、９はＤ／Ｕ比測定
回路、１０はチヤネル制御回路、１１はコード発
生器、１２は音声又はデータ入力端子、１３は変
調回路、１４は混合回路、１５は増幅器、１６は
発振回路である。 FIG. 5 is a block diagram of one embodiment of the present invention, in which 4 is an antenna, 5 is a duplexer, 6 is a receiver,
7 is a demodulation circuit, 8 is an output terminal, 9 is a D/U ratio measuring circuit, 10 is a channel control circuit, 11 is a code generator, 12 is an audio or data input terminal, 13 is a modulation circuit, 14 is a mixing circuit, 15 is an amplifier, and 16 is an oscillation circuit.
空中線４及び送受共用器５を経て受信機６に入
力された電波は、希望波と妨害波が重畳されたも
のである。受信機６で検討された後、音声又はデ
ータ信号は復調回路７で復調後、出力端子８に出
力される。同時に、受信機６の出力はＤ／Ｕ比測
定回路９に入力されＤ／Ｕ比を測定される。Ｄ／
Ｕ比が規定値以下となつたときのみチヤネル制御
回路１０に信号を出すようにＤ／Ｕ比測定回路９
は構成される。チヤネル制御回路１０は、Ｄ／Ｕ
比が劣化したことをＤ／Ｕ比測定回路９の出力に
より知ると、待避用チヤネルに切り替える旨の信
号をコード発生器１１で発生し、通信中のチヤネ
ルを用いて、変調回路１３、混合回路１４、増幅
器１５、送受共用器５及び空中線４を介して通信
の相手方に知らせる。その後、チヤネル制御回路
１０は、送信周波数を待避用チヤネルに切り替え
るよう発振回路１６を制御し、チヤネルを切り替
える。 The radio waves input to the receiver 6 via the antenna 4 and the duplexer 5 are a combination of desired waves and interference waves. After being examined by the receiver 6, the voice or data signal is demodulated by the demodulation circuit 7 and then output to the output terminal 8. At the same time, the output of the receiver 6 is input to the D/U ratio measuring circuit 9 and the D/U ratio is measured. D/
The D/U ratio measurement circuit 9 outputs a signal to the channel control circuit 10 only when the U ratio is below a specified value.
is composed of The channel control circuit 10 is a D/U
When it is learned from the output of the D/U ratio measurement circuit 9 that the ratio has deteriorated, the code generator 11 generates a signal to switch to the standby channel, and the modulation circuit 13 and the mixing circuit use the channel in communication. 14, inform the other party of the communication via the amplifier 15, duplexer 5, and antenna 4. Thereafter, the channel control circuit 10 controls the oscillation circuit 16 to switch the transmission frequency to the protection channel, thereby switching the channel.
通信中に待避のための情報を基地局から移動局
へ通知する方法は、特許出願昭57−217024無線回
線監視制御方式に記されているような通信帯域を
分割する方法や時分割多重する方法等がある。 Methods for notifying information for evacuation from a base station to a mobile station during communication include a method of dividing the communication band and a method of time division multiplexing as described in the patent application 1983-217024 Wireless line monitoring control system. etc.
以上の説明は待避用チヤネルが一つの場合につ
いて述べたが、本発明はこれに限定されることな
く、待避用チヤネルを複数個有する場合にも適用
できる。 Although the above description has been made regarding the case where there is one evacuation channel, the present invention is not limited to this, and can also be applied to a case where there is a plurality of evacuation channels.
以上説明したように、本発明の方式によれば通
信用チヤネルとは別に待避用チヤネルを設けるこ
とにより、通信チヤネルにおいてチヤネル干渉妨
害が発生したときに待避用チヤネルに切り替えて
通信を継続するか、または待避用チヤネルを使用
して通知された他の通信用チヤネルによつて通信
を継続するのでチヤネル干渉妨害を回避できると
いう利点がある。 As explained above, according to the method of the present invention, by providing an evacuation channel separately from a communication channel, when channel interference occurs in a communication channel, whether to switch to the evacuation channel and continue communication, or Alternatively, since communication is continued through another communication channel notified using the protection channel, there is an advantage that channel interference can be avoided.
第１図はゾーンの概念図、第２図は陸上移動通
信おける伝ぱん距離特性の例を示す図、第３図は
同一チヤネル干渉妨害を説明する図、第４図は基
地局及び移動局における制御手順の要部フローチ
ヤート、第５図は本発明の１実施例のブロツク図
である。
１，１′……ゾーン、２，２′……無線基地局、
３，３′……移動局、４……空中線、５……送受
共用器、６……受信機、７……復調回路、８……
出力端子、９……Ｄ／Ｕ比測定回路、１０……チ
ヤネル制御回路、１１……コード発生器、１２…
…音声又はデータ入力端子、１３……変調回路、
１４……混合回路、１５……増幅器、１６……発
振回路。
Figure 1 is a conceptual diagram of a zone, Figure 2 is a diagram showing an example of propagation distance characteristics in land mobile communication, Figure 3 is a diagram explaining co-channel interference, and Figure 4 is a diagram of a base station and a mobile station. FIG. 5, which is a flowchart of the main part of the control procedure, is a block diagram of one embodiment of the present invention. 1, 1'...zone, 2, 2'...wireless base station,
3, 3'... Mobile station, 4... Antenna, 5... Dual transmitter/receiver, 6... Receiver, 7... Demodulation circuit, 8...
Output terminal, 9...D/U ratio measurement circuit, 10...Channel control circuit, 11...Code generator, 12...
...Audio or data input terminal, 13...Modulation circuit,
14...mixing circuit, 15...amplifier, 16...oscillator circuit.
Claims (1)
移動局が該ゾーンの基地局と通信を行い、第一の
無線ゾーンで使用している無線周波数と同じ無線
周波数を、第一の無線ゾーンからある距離だけ離
れた第二の無線ゾーンで繰り返して使用するよう
に構成された移動通信方式において、通信開始時
あるいは無線ゾーン移行時に割当てられる通信用
チヤネルとは別に待避用チヤネルをあらかじめ設
け、基地局あるいは移動局で通信中のチヤネルの
希望波対干渉波レベル比（Ｄ／Ｕ比）を測定し、
測定したＤ／Ｕ比が所定値以下となつた場合に、
該通信中のチヤネルの呼を待避用チヤネルに切り
替えることを特徴とする移動通信チヤネル切替制
御方式。 ２ 無線ゾーンが複数個配置され、各ゾーン中の
移動局が該ゾーンの基地局と通信を行い、第一の
無線ゾーンで使用している無線周波数と同じ無線
周波数を、第一の無線ゾーンからある距離だけ離
れた第二の無線ゾーンで繰り返して使用するよう
に構成された移動通信方式において、通信開始時
あるいは無線ゾーン移行時に割当てられる通信用
チヤネルとは別に待避用チヤネルをあらかじめ設
け、基地局あるいは移動局で通信中のチヤネルの
希望波対干渉波レベル比（Ｄ／Ｕ比）を測定し、
測定したＤ／Ｕ比が所定値以下となつた場合に、
前記待避用チヤネルを用いて基地局から移動局に
対し次に切り替わるべき新通信用チヤネルを通知
し、それ迄通信中であつたチヤネルの呼を新通信
チヤネルに切り替えることを特徴とする移動通信
チヤネル切替制御方式。[Claims] 1. A plurality of wireless zones are arranged, and a mobile station in each zone communicates with a base station in the zone, using the same wireless frequency as that used in the first wireless zone. In a mobile communication system configured to be repeatedly used in a second wireless zone that is a certain distance away from the first wireless zone, a standby channel is set aside from the communication channel assigned at the start of communication or when transitioning to a wireless zone. is set in advance, and the desired wave to interference wave level ratio (D/U ratio) of the channel being communicated at the base station or mobile station is measured,
When the measured D/U ratio falls below a predetermined value,
A mobile communication channel switching control method characterized in that a call in the channel in progress is switched to a standby channel. 2 A plurality of wireless zones are arranged, and the mobile stations in each zone communicate with the base station of the zone, and the mobile station in each zone communicates with the base station of the zone, and transmits from the first wireless zone the same wireless frequency as that used in the first wireless zone. In a mobile communication system configured to be repeatedly used in a second wireless zone separated by a certain distance, a standby channel is provided in advance, separate from the communication channel assigned at the start of communication or when changing to a wireless zone, and the base station Alternatively, the mobile station measures the desired wave to interference wave level ratio (D/U ratio) of the channel being communicated,
When the measured D/U ratio falls below a predetermined value,
A mobile communication channel characterized in that a base station notifies a mobile station of a new communication channel to be switched to next using the standby channel, and a call on the channel that was in communication until then is switched to the new communication channel. Switching control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58152443A JPS6046144A (en) | 1983-08-23 | 1983-08-23 | Control system of mobile communication channel changeover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58152443A JPS6046144A (en) | 1983-08-23 | 1983-08-23 | Control system of mobile communication channel changeover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6046144A JPS6046144A (en) | 1985-03-12 |
| JPH0336343B2 true JPH0336343B2 (en) | 1991-05-31 |
Family
ID=15540634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58152443A Granted JPS6046144A (en) | 1983-08-23 | 1983-08-23 | Control system of mobile communication channel changeover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6046144A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2694138B2 (en) * | 1988-07-22 | 1997-12-24 | 日本電信電話株式会社 | Mobile communication channel switching method |
| JPH066856A (en) * | 1992-06-19 | 1994-01-14 | Mitsubishi Electric Corp | Moving body communication system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58221531A (en) * | 1982-06-17 | 1983-12-23 | Nec Corp | Tunnel zone channel switching system |
-
1983
- 1983-08-23 JP JP58152443A patent/JPS6046144A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58221531A (en) * | 1982-06-17 | 1983-12-23 | Nec Corp | Tunnel zone channel switching system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6046144A (en) | 1985-03-12 |
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