JP3052241B2 - Call channel assignment method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a signal control system in a cordless telephone system, for example, for reducing the number of IDs assigned to a communication channel or a radio base station.

[Conventional technology]

FIG. 8 is an example of a configuration diagram of a general cordless telephone system including a wireless base station 82 and a mobile device 83 connected to a line controller 81 and a wired line. FIG. 9 is an example of a frame configuration of a signal transmitted and received between a general wireless base station 82 and a mobile device 83. This signal includes a preamble 91, a frame synchronization pattern 92, a call connection control signal or an identification signal 93 indicating a call signal, a channel ID 94, an information section.
95, and 96 error correction.

Generally, different IDs are fixedly assigned to the line controller 81, the radio base station 82, and the mobile device 83, respectively, and
By confirming the ID, it is possible to identify whether the calling mobile device 83 is a mobile device 83 that can talk, check the communication channel between the mobile device 83 and the wireless base station 82, and receive a signal erroneously due to interference from another channel. It is used for prevention and the like.

FIG. 10 is an example of a calling sequence of a cordless telephone system including a wireless base station 82 and a mobile device 83.

When the mobile device 83 originates a call, the mobile device 83 transmits a call signal 101 to the radio base station 82 on the control channel, and the received call signal 101 is transmitted to the line control device 81, and the line control device 81
Determines the communication channel, notifies the mobile station 83 of the communication channel number via the radio base station 82 by using the call response signal 102. The mobile device 83 switches to the communication channel and the radio base station 82
The channel switching completion signal 103 is transmitted to the line controller 81 via the
The transmission is made from 3 to the line control device 81, and the call is started.

In the radio section between the radio base station 82 and the mobile device 83, the mobile station ID and the mobile device ID in the signal of the control channel or the communication channel are exchanged to communicate with each other while confirming with each other's communication partner. When a different ID is received due to interference from the channel, the signal is discarded, and communication is always performed only with the communication partner. Thus, ID identification is a useful means against interference from other channels.

Next, a method for preventing interference of a communication channel in a repetition zone of a car phone will be described. FIG. 11 is a conceptual diagram of a wireless zone configuration in a mobile wireless system. 111 is a service area, which can be nationwide in public mobile radio. 112A to 112C are repetition zones of the same frequency for effective use of the radio frequency. Each iteration zone 112A~112C is composed of a plurality of radio zones of the mobile station is sufficiently communicable radius _{A 1, B 1, C 1} ~A 3, B 3, C 3. Each of the radio zones _{A 1, B 1, C 1} ~A 3, B 3, the C ₃ one or more traffic channel is set. Reference numeral 113 denotes a wireless base station installed in each wireless zone. The arrangement of the communication channels in each of the wireless zones A ₁ , B ₁ , C _{1 to} A ₃ , B ₃ , C ₃ uses the same frequency repeatedly because the radio frequency is effectively used. The channels used in a plurality of wireless zones in 112A are all different, but the channels used in A ₁ , B ₁ , and C ₁ are the same. Similarly, (A ₂ , B ₂ , C ₂ ), (A ₃ , B ₃ ,
C ₃₎ also use the same channel. At that time, if the mobile station is performing a call using the same radio channel in a repeating zone exists, there is a possibility that a call signal of the radio zones A ₁ gives interference to radio zone B _1, C _1. In particular, call connection control signals, such as call termination signals, must not be received in other repetition zones. Therefore, a binary identification control code (J-CODE) is added to the control signal in the communication channel for each zone that repeatedly uses the same radio frequency, and a plurality of telephones using the same frequency in different radio zones to communicate with each other. For this mobile device, erroneous operation due to control interference in the communication channel is prevented.

Similarly, in the incoming call control channel, a binary identification control code (K-CODE) is added for each control zone to prevent malfunction at the time of jump propagation by repeatedly using the frequency.

As described above, in the mobile telephone system, the regularly arranged wireless zones form a repetitive zone for each of the plurality of wireless zones, and a different identification code is fixedly added to each of the zones.

[Problems to be solved by the invention]

As described above, in a system in which a regular zone design is easy such as a car phone, J-CODE, K-CODE
Can be fixedly assigned, and a malfunction at the time of jump propagation of a radio wave can be prevented. However, in a cordless telephone system, it is difficult to perform communication by adding an identification control code for channel identification to a radio base station since a regular zone configuration cannot be taken. In the signal control system of the conventional cordless telephone system, individual IDs are fixedly assigned to the installed radio base stations, and the IDs are exchanged with each other to identify the other channel and perform call connection and communication. Therefore, different IDs for the maximum allowable radio base stations of the system are required. For example, if there are 1000 wireless base stations in one cordless telephone system, ID
However, since 10 bits are needed to obtain 1000 different code patterns, the amount of information signals transmitted between the wireless base station and the mobile device when making a call connection or a call increases. was there.

The present invention has been made in view of the above circumstances, to reduce the number of encoded bits by reducing the number of IDs,
It is an object of the present invention to provide a signal control method of a cordless telephone system capable of improving transmission efficiency.

[Means for solving the problem]

The present invention solves the above problems by using a method of assigning an ID for identifying a communication path between a radio base station and a mobile device for each channel in a temporal and spatial manner. The main feature is that the ID is repeatedly used in the channel.

[Action]

By the means described above, the number of ID patterns can be reduced and the number of ID bits can be reduced by repeatedly and temporally and spatially using IDs assigned to a radio base station or a communication channel. Thus, it is possible to reduce the amount of ID signals to be inserted into the base station and efficiently transmit information to be transmitted from the wireless base station to the mobile device with a small amount of signals.

〔Example〕

(Embodiment 1) FIG. 1 is a diagram for explaining an embodiment of the present invention. For example, 11 is a wired line (telephone subscriber line), 12 is a wireless line control device, 13 is a wired line, and 14a to 14a. 14c is a wireless base station, 15 is a mobile station, 16 is a wireless line, and the present invention is a wireless line controller 12 connected by a wired line (telephone subscriber line) 11, a wired line
The wireless base station 14 is connected to the wireless base station 14a to 14c by the communication channel 13 and the mobile station 15 connected to the wireless base station 14a to 14c by the communication channel of the wireless line 16. A to C are service zones. In the service zone A, the radio base station 14a is arranged.
Also, the radio base stations 14b to 14c are arranged for the respective service zones A to C, and the respective service zones A to C overlap with the adjacent zones. Each service zone AC has one or more channels.

FIG. 2 shows an example of a block diagram of the radio circuit controller 12, wherein 21 is an interface circuit between a telephone network and a switch circuit, 22 is a switch circuit for connecting a line between a general telephone network and a cordless telephone system, and 23 Is an interface circuit between the switch circuit and the radio base station, 24 is a control device of the radio channel controller, and 25 is a memory of the radio channel controller.

FIG. 3 shows an example of a block diagram of the radio base stations 14a to 14c, which comprises a radio transceiver 32,
Interface circuit 31 with line controller 12, memory 35
Is connected.

FIG. 4 shows an example of a block diagram of the mobile device 16,
It includes a wireless transceiver 42, a transmitting / receiving antenna 41, a control device 43
Is connected to the control device 43, the display device 44, the memory
45, an audio circuit 46 is connected.

FIG. 5 shows an example of the ID table in the memory 35 of the wireless base stations 14a to 14c. Here, all IDs used in the system
A number 51 and a code ID pattern 52 are stored. Since no interference occurs between channels of the same radio base station, the same ID
Can also be used. When there are multiple wireless base stations, the same ID is used in service zones that are far enough from the interference distance.
Can be used. In the case of different time, the same ID can be used.

 FIG. 6 is an example of a calling sequence of the present embodiment.

An example of the operation of the cordless telephone system according to the present embodiment will be described below.

The ID of the wireless base station 14a in the service zone A is the same as the ID of the wireless base station 14c in the service zone C that is more than the interference distance.
Use D repeatedly in time and space.

As a method of assigning a wireless base station ID, for example, first, the wireless base station 14a assigns one arbitrary ID from the ID table stored in the memory 35 to its own wireless base station. Next, the radio base station 14b receives the control signals of the peripheral radio base stations 14a and 14c, detects the ID assigned in the peripheral zone, searches the other IDs from the memory of the radio base station 14b, and automatically detects the ID. Assign to a radio base station. Similarly, the wireless base station 14c detects the ID use status of the surrounding zone and assigns an unused ID. Furthermore, even when there are more radio base stations, the same assignment is made. In this way, the wireless base station ID autonomously repeatedly uses the assigned ID autonomously in sequence when the system is started, when the wireless base station is added, and when the reallocation is performed.

When the mobile station 15 originates a call, the mobile station 15 sends a call to the radio base station 14a using the ID of the radio base station 14a and the mobile station 15 on the control channel.
Is transmitted to the line controller 12 through the radio base station 14a. Wireless base station 1
4a determines an unused communication channel number and communication channel ID, and notifies the mobile device 15 after receiving the call response signal 62.

The method of allocating a communication channel is, for example, a radio base station
14a selects an unused communication channel, and the radio base station 14a receives radio waves of the peripheral radio base stations 14b and 14c on this communication channel, and searches the ID use status. An arbitrary ID unused in another zone is selected from the ID table stored in the memory 35. When a call is made in another zone, the mobile station assigns a communication channel ID in the same manner at the radio base station with which a call is to be made.

The mobile device 15 switches the communication channel determined by the line control device 12, transmits a channel switching completion signal 63 to the line control device 12 via the radio base station 14a, and sets a communication path from the line control device 12 to the mobile device 15. When the dial signal 64 is
The communication is transmitted from 15 to the line control device 12, and the call 65 is started.

There is also a method for assigning the ID of a communication channel, such as that found in J-CODE and K-KODE of a car telephone system. However, in a cordless telephone system, it is extremely difficult to arrange wireless zones in a regular manner. Dynamically assign IDs to call channels.

In the wireless section between the wireless base station 14a and the mobile device 15, the control channel performs communication while exchanging the wireless base station ID and the mobile device ID while confirming each other's communication partner. By exchanging the communication channel ID determined by the line controller 12, communication is performed while confirming each other's communication partner. If a different ID is received due to interference from another channel, the signal is discarded,
Communication is always performed only with the communication partner. Thus, the ID
Identification is a useful measure against interference from other channels.

As described above, the ID in the control channel reduces the number of patterns of the radio base station ID and the number of bits of the ID by repeatedly using the same ID for the radio base station in the service zone separated by the interference distance or more. In addition, it is possible to reduce a signal transmission amount transmitted and received between the wireless base station and the mobile device.
For example, if there are 1000 wireless base stations in one cordless telephone system, for example, the base station ID in the call signal
Previously required 10 bits. However, when the ID is used spatially repeatedly in 21 zones as described in the present invention, the ID can be reduced to 5 bits. Also, in the communication channel, for example, the use ID of the surroundings in the radio base station
Is detected, an unused ID is autonomously allocated, and the ID is dynamically allocated to each communication channel. Therefore, the number of ID bits can be reduced as compared with the conventional method, and the transmission efficiency can be increased.

Embodiment 2 The configuration of the system is the same as that of FIG. 1 described above, and the case where the method of assigning ID is different will be described.

FIG. 7 shows an example of an ID management table in the memory 25, in which IDs currently assigned to each channel in each service zone are stored. 71 is a zone name, 72 is a channel number, and 73 is a use ID number.

An example of the operation of the cordless telephone system according to the second embodiment will be described below.

The ID of the wireless base station 14a in the service zone A is the same as the ID of the wireless base station 14c in the service zone C that is more than the interference distance.
Use D repeatedly in time and space. This can be achieved, for example, by setting an ID that is fixedly assigned to each wireless base station when the wireless base station is installed so that the ID is repeatedly used by wireless base stations that are sufficiently away from each other by an interference distance.

When the mobile station 15 originates a call, the mobile station 15 transmits a call signal 61 including the ID of the radio base station 14a and the ID of the mobile station 15 assigned to the radio base station 14a at the time of system startup to the radio base station 14a on the control channel. Is transmitted to the line controller 12 via the radio base station 14a. When the line controller 12 determines the communication channel, the communication channel number and the communication channel ID are transmitted.
Is transmitted to the mobile station 15 via the radio base station 14a.
To inform.

The mobile station 15 switches to the communication channel determined by the line controller 12, and sends a channel switch completion signal 63 to the radio base station 14a.
Then, when the communication path between the line control device 12 and the mobile device 15 is set, the dial signal 64 is transmitted from the mobile device 15 to the line control device 12 to start the communication 65.
When assigning an ID to exchange in a call channel,
The line controller 12 searches the ID assignment management table of each zone in the memory 25, grasps the ID use status of the peripheral service zone, and finds an unused ID or an ID used in a zone sufficiently separated by an interference distance or more. Select and dynamically assign to a call channel.

In the radio section between the radio base station 14a and the mobile device 15, the control channel performs communication while exchanging the radio base station ID and the mobile device ID while confirming each other's communication partner,
In the communication channel, the communication is performed while exchanging the communication channel ID determined by the line control device 12 while confirming each other's communication partner. When a different ID is received due to interference from another channel, the signal is discarded and communication is always performed only with the communication partner. Thus, ID identification is a useful means against interference from other channels.

As described above, for example, the same effect as in the first embodiment can be obtained by centrally controlling and controlling the IDs to be allocated to the control channel and the communication channel by the radio channel controller 12 and dynamically allocating the channels repeatedly in time and space. Obtainable.

[Effects of the Invention] As described above, according to the present invention, different IDs which have been fixedly assigned to each radio base station or each channel are temporally and spatially repeatedly assigned, so that this ID pattern Can be reduced, and the number of bits of the ID can be reduced, so that the speech signal can be transmitted more efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a cordless telephone system according to an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a configuration of a radio circuit controller of FIG. 1, and FIG. FIG. 4 is a block diagram showing an example of the configuration of the mobile station shown in FIG. 1, and FIG. 5 is a block diagram showing an example of an ID table of the wireless base station shown in FIG. FIG. 6 is an explanatory diagram showing an example of the calling sequence of FIG. 1, FIG. 7 is an explanatory diagram showing an example of an ID management table of the line controller of FIG. 1, and FIG. 8 is a conventional cordless telephone. FIG. 9 is an explanatory diagram showing an example of a signal format transmitted / received in a conventional radio section, FIG. 10 is an explanatory diagram showing an example of a calling sequence in FIG. 8, and FIG. FIG. 1 is an explanatory diagram showing a wireless zone configuration in a conventional car telephone system. 11 ... wired line (telephone subscriber line), 12 ... wireless line controller, 13 ... wired line, 14a-14c ... wireless base station, 15 ...
… Mobile device, 16… wireless line, A to C… service zone, 21… interface circuit, 22… switch circuit, 23… interface circuit with wireless base station, 24…
... Control device, 25 ... Memory, 31 ... Interface circuit with line control device, 32 ... Wireless transceiver, 33 ... Antenna, 34 ... Control device, 35 ... Memory, 41 ... Antenna, 42 ... ... Wireless transceiver, 43 ... Control device, 44 ... Display device, 45 ... Memory, 46 ... Sound circuit, 51 ... ID number,
52 ... ID pattern, 61 ... Call signal, 62 ... Call response signal, 63 ... Channel switching completion signal, 64 ... Dial signal, 65 ... Call, 71 ... Zone name, 72 ... Channel No. 73 ... ID number to be used, 81 ... Circuit controller, 82 ... Radio base station, 83 ... Mobile device, 91 ... Preamble, 92 ...
Frame synchronization pattern, 93: signal identification signal, 94: I
D, 95: Information section, 96: Error correction, 101: Call signal,
102 …… Call response signal 103 …… Channel switching completion signal
104 ... Dial signal, 111 ... Service area, 112A ~
112C …… Repeated zone, 113 …… Wireless base station, A ₁ , B ₁ ,
C ₁ , to A ₃ , B ₃ , C ₃ ... wireless zone.

Continuation of the front page (72) Inventor Izumi Horikawa 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References US Patent 5042082 (US, A) (58) Fields investigated (Int. H04B ^7/ 24-7/26 H04Q 7/06-7/38

Claims (1)

(57) [Claims] 1. A communication channel allocation method in a mobile communication system including a plurality of mobile stations and a plurality of radio base stations, wherein the communication channel is identified as a communication channel allocated between the radio base station and the mobile station. A communication channel assignment method characterized by dynamically assigning IDs dynamically, temporally or spatially.