JP3392722B2 - Control method for anti-interference system in cellular mobile communication - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interfering system control method in cellular mobile communication capable of avoiding the influence of interference from other communication systems in cellular mobile communication systems such as mobile phones, car phones and simplified mobile phones. More specifically, with respect to interference in cellular mobile communication in which wireless line connection is performed while avoiding the influence of interference on connection quality and communication quality in a cellular mobile communication system that forms a wireless zone using a plurality of different frequency bands. Regarding system control method.

[0002]

2. Description of the Related Art In a cellular mobile communication system that forms a radio zone by using a plurality of different frequency bands, interference from other communication systems is simultaneously received by a base station or a mobile station receiver on a wide range of channels within the used band. When there is one or more frequency bands to be received, the mobile station receiving side receives interference from the mobile station transmitting side of the other system at the mobile station receiving side, as shown in FIG. The reception band of the station is A1 to An band (hereinafter, referred to as A band) and B1 to Bn band (hereinafter, referred to as B band), and the transmission band of the mobile station of another communication system in which the used band is present near If the band is the C band, the spectrum of the mobile station transmission signal in the C band is B as shown in FIG.
When leaking into the mobile station reception in the band, deterioration of the signal-to-noise ratio occurs in the B-band mobile station reception channel.

In such a situation, the signal-to-noise ratio deteriorates regardless of which communication channel in the B band is used.
The connection quality and communication quality will deteriorate. However,
Even in the situation where the entire B band is interfered with, the mobile station reception level is high in the central part of the wireless zone and the like, so that the deterioration of the signal-to-noise ratio has less influence on the connection quality and the communication quality. However, since the mobile station reception level is low in the periphery of the wireless zone, the deterioration of the signal-to-noise ratio has a large effect on the connection quality and communication quality, and the connection quality deteriorates during outgoing / incoming call connections. In the inside, the deterioration of the communication quality becomes remarkable.

The above is the same in the case of the frequency band distribution examples shown in FIGS. FIG. 9 is a distribution example of a frequency band used in which the base station receiving side of the own system receives interference from the mobile station transmitting side of the other system, and the transmission of the mobile station of the other system is transmitted from the mobile station of the own system to the base station. This is the case when it interferes with the uplink. Further, FIG. 10 is an example of a distribution of a used frequency band in which the base station receiving side of the own system receives interference from the base station transmitting side of the other system, and the transmission of the base station of the other system is transmitted from the mobile station of the own system to the base station. This is the case when it interferes with the uplink to. Further, FIG. 11 is a distribution example of a frequency band used in which the mobile station receiving side of the own system receives interference from the base station transmitting side of the other system, and the transmission of the base station of the other system is transmitted from the base station of the own system to the mobile station. This is the case when it interferes with the downlink to.

In the conventional system control method, the A band and the B band can be used regardless of the degree of the influence of the interference. Depending on the degree of the influence of the interference, the used frequency band (A band, B band) can be used. ) Or which communication channel is used.

[0006]

In the conventional system control method, one or a plurality of frequencies at which interference from another communication system is simultaneously received by a base station or a mobile station receiving side over a wide range of channels within a used band. Bandwidth exists,
In the situation where interference is received over the entire frequency band, the connection quality and the communication quality may be deteriorated due to the influence of interference when the frequency band is used and used as a communication channel. . In particular, in the peripheral part of the wireless zone, the degree of deterioration of the signal-to-noise ratio is larger than that in the central part of the wireless zone, so that the connection quality and the communication quality are significantly deteriorated.

The present invention has been made in view of the above,
The purpose thereof is that in a cellular mobile communication system, there is one or more frequency bands in which interference from other communication systems is simultaneously received by a base station or a mobile station receiving side over a wide range of channels within a used band. Another object of the present invention is to provide an interfering system control method in cellular mobile communication that avoids the influence on connection quality and communication quality.

[0008]

In order to achieve the above object, the present invention according to claim 1 provides an interference from another communication system in a cellular mobile communication using a plurality of different frequency bands to form a wireless zone. When there is one or more frequency bands in which the base station or the mobile station receiver side simultaneously receives in a wide range of channels within the used band, the central part of the wireless zone is closer to the influence of interference from other communication systems. Communicate using a communication channel with a large frequency band, and use a communication channel with a frequency band with little influence of interference from other communication systems or a frequency band with no influence of interference from the other communication system in the vicinity of the wireless zone. The point is to communicate.

According to the present invention of claim 1, the communication team
Use different channels depending on the reception level of the mobile station
By performing control, communication is performed using a communication channel in a frequency band in which the central part of the wireless zone has a large influence of interference from other communication systems, and the peripheral part of the wireless zone causes interference from other communication systems. Communication is performed using a communication channel in a frequency band in which the influence of the above is small or a frequency band in which there is no influence of interference .

The present invention according to claim 2 is a wireless zone.
The closer to the center, the better the influence of interference from other communication systems.
Communication is performed using a communication channel with a wide frequency band.
The closer to the wireless zone is from other communication systems
Frequency bands with less interference or no interference
Communicate using a communication channel in a non-frequency band,
The frequency band in which the interference from the other communication system is simultaneously received by the base station or the mobile station receiving side on a wide range of channels within the used band is divided into a plurality of communication channel groups, and the influence of the interference from the other communication system The point is that the larger the communication channel, the more the communication channel is used in the center of the wireless zone.

According to the second aspect of the present invention, a frequency band that receives interference from another communication system is divided into a plurality of communication channel groups, and a communication channel having a greater influence of interference from another communication system , Used in the center of the wireless zone.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an example of the degree of influence of interference from another communication system in the frequency band distribution example shown in FIG. As shown in the figure, B1 band, B
2 band, the degree of order in the interference effects of · · · Bn band (another by Una frequency band Ru received simultaneously in a wide range of channel interference of the used band at the mobile station receiver of a communication system) is decreased There is.

FIG. 2 shows conditions for selectively using the communication channels of the A band (frequency band not affected by interference from other communication systems) and the above-mentioned B1 band, B2 band, ... Bn band. is there. That is, the system control is performed so that the communication channel is selectively used according to the reception level of the mobile station. In FIG. 2, when the reception level L at the mobile station is large, that is, when the reception level L is larger than LB1, B1 is set as the communication channel.
A band is used, a B2 band is used when the reception level L is between LB1 and LB2, and similarly, when the reception level L is smaller than LBn, control is performed to use the A band. is there.

By controlling the communication channels to be used properly according to the reception level in this way, the communication channel with the greater influence of interference is used in the central portion of the wireless zone, and the influence of the interference is increased in the peripheral portion of the wireless zone. Communication channels can be used.

A specific system control example will be described with reference to FIGS. FIG. 3 shows an example of a call origination connection, in which a network (NW) is generated by a call origination request signal from a mobile station.
Which frequency band is allocated in the wireless zone according to its own zone level L, that is, A band, B
It is determined which one band, B2 band, ... Bn band is to be used. When L ≧ LB1, a communication channel within the B1 band is allocated, and when LB1> L ≧ LB2,
Allocates a communication channel in the B2 band, LB (n-1)
When> L ≧ LBn, a communication channel in the Bn band is assigned, and when L <LBn, a communication channel in the A band is assigned.

FIG. 4 shows an example of connection when an incoming call is made. The mobile station receives an incoming call signal from the network (NW), and the mobile station responds to the network (NW) with an incoming call response signal. Which frequency band allocated in the wireless zone is to be used is determined according to its own zone level L. L ≧ LB1
In the case of, the communication channel in the B1 band is allocated, and L
When B1> L ≧ LB2, a communication channel in the B2 band is assigned, and when LB (n−1)> L ≧ LBn, a communication channel in the Bn band is assigned, L <LBn
In the case of, the communication channel in the A band is allocated.

Further, FIG. 5 shows an example of channel switching within one radio zone during communication between the mobile station and the network (NW). The mobile station reports to the network (NW) at regular time intervals. It constantly monitors the periodic wireless status report signal,
When L ≧ LB1 is detected during communication as the level L of the signal, the channel is switched to the communication channel within the B1 band, and when LB1> L ≧ LB2 is detected, B is detected.
Switch the channel to the communication channel within 2 bands, and LB
When (n-1)> L ≧ LBn is detected, the channel is switched to the communication channel in the Bn band, and L <LBn
When is detected, the channel is switched to the communication channel in the A band.

Further, even within each of the B1, B2, ..., Bn bands, the influence of interference by the C band (the transmission band of the mobile station or the base station of another communication channel whose used band is in the vicinity) is The degree is different. FIG. 6 shows an example of channel group division within the B1 band. Even within the B1 band, the B11 channel group near the C band has a large influence of the C band interference, and the B12 channel group has a large influence of the C band interference. However, the degree is smaller than that of the B11 channel group. Therefore, by further dividing the communication channel in the B1 band into channel groups for use, the frequency in the B1 band can be effectively used.

FIG. 7 shows the usage conditions of each channel group when the B1 band is divided into channel groups. When the mobile station reception level L is L ≧ LB11, the B11 channel group is used and L
When B11> L ≧ LB12, the B12 channel group is used, when LB1 (n−1)> L ≧ LB1n, the B1n channel group is used, and when L <LB1n, the A band channel is used. The same applies to the B2, B3, ..., Bn bands. Further, specific system control examples are shown in FIGS.
Is the same as.

[0021]

As described above, according to the present invention,
When there is one or a plurality of frequency bands in which interference from other communication systems is simultaneously received by a base station or a mobile station reception side over a wide range of channels within the used band, the communication becomes closer to the center of the wireless zone. Communicate using a communication channel in a frequency band that is greatly affected by interference from the system,
Since the communication is performed using a communication channel in a frequency band in which the influence of interference from other communication systems is small or a frequency band in which the influence of interference from other communication systems is completely absent, the influence of interference on connection quality and communication quality Can be avoided.

Further, according to the present invention, the frequency band that receives interference from another communication system is divided into a plurality of communication channel groups, and a communication channel having a greater influence of interference from another communication system has a higher wireless zone. Since it is used in the center, the influence of interference can be avoided.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an influence degree of interference from another communication system in a frequency band distribution example.

FIG. 2 shows conditions for selectively using communication channels.

FIG. 3 is an explanatory diagram showing an example of system control at the time of outgoing connection.

FIG. 4 is an explanatory diagram showing an example of system control when an incoming call is connected.

FIG. 5 is an explanatory diagram showing an example of system control for channel switching within a wireless zone.

FIG. 6 is a diagram showing an example of the degree of influence of channel group division and interference in the same band.

FIG. 7 is a diagram showing usage conditions of each channel group when dividing the channel group in the B1 band.

FIG. 8 is a diagram showing an example of distribution of used frequency bands in which interference from a mobile station transmission side of another system is received at a mobile station reception side of the own system.

FIG. 9 is a diagram showing an example of distribution of used frequency bands in which interference from a mobile station transmission side of another system is received at a base station reception side of the own system.

FIG. 10 is a diagram showing an example of distribution of used frequency bands in which interference from the base station transmission side of another system is received at the base station reception side of the own system.

FIG. 11 is a diagram showing an example of distribution of used frequency bands in which interference from the base station transmission side of another system is received at the mobile station reception side of the own system.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-182042 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 7/24-7/26 102 H04Q 7 / 00-7/38

Claims (2)

(57) [Claims] 1. In cellular mobile communication in which a radio zone is formed using a plurality of different frequency bands, interference from other communication systems is simultaneously received by a base station or a mobile station receiving side over a wide range of communication channels within the used band. If one or more frequency bands, such as present, the communication channel
The mobile station according to the reception level of the mobile station.
By performing control, communication is performed using a communication channel in a frequency band in which the central part of the wireless zone has a large influence of interference from other communication systems, and the peripheral part of the wireless zone causes interference from other communication systems. An interfering system control method in cellular mobile communication, characterized in that communication is performed using a communication channel in a frequency band having a small influence of the frequency band or a frequency band having no influence of the interference. 2. Radio using a plurality of different frequency bands
Other communication systems in cellular mobile communication forming a zone
Band used by the base station or mobile station receiver on the receiver side
One that is simultaneously received on a wide range of communication channels within
Or in the wireless zone when multiple frequency bands exist
The closer to the heart, the greater the influence of interference from other communication systems
Communicates using communication channels in the frequency band and
The closer to the zone, the shadow of interference from other communication systems.
Frequency bands with low resonance or no interference
Communication is performed using communication channels of several bands, and a plurality of communication channels having frequency bands in which interference from the other communication system is simultaneously received by a wide range of communication channels within the used band at the receiving side of the base station or mobile station divided into groups, the larger the communication channel of the impact of interference from other communication systems, to interference system control method in the feature and be Rousset Lula mobile communications to be used in the center of the radio zone.