JPH0465996A - Position registration area construction system - Google Patents

Abstract

PURPOSE:To reduce the change of transfer capacity required for a radio section when the moving speed of a mobile station changes by setting the dimension of the position registration area in advance corresponding to the speed of each mobile station. CONSTITUTION:When moving at the moving speed corresponding to a mobile station 41 and a high-speed mode A, the position registration is performed in positions 52/53/54 where the information contents of a time slot changes accompanied by the movement of the movile station 41. When the station 41 transfers a position registration request signal to a radio base station, the position registration area where the mobile station exists is discriminated in the radio base station while adding the information indicating the performance of the position registration based on the position registration discrimination signal of the mode A. When the mobile station 41 moves at the moving speed 51 of a low-speed mode B, the position registration is performed only in the position 53 where the information contents of the time slot changes accompanied by the movement of the mobile station since the station 41 refers to the only time slot corresponding to the mode B.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a location registration area configuration system, particularly in the field of cellular radio telephones, in particular when the radius of a radio zone constituted by a radio base station is determined by the movement of a mobile station. The present invention relates to a system for configuring a location registration area when a mobile station performs automatic location registration with a network when the distance is relatively small compared to the distance and the time the mobile station stays in one wireless zone is short.

[Conventional technology]

Wireless communication services require that the user's current location can be identified, and that the user's current location must be re-registered promptly if there is a change.

Registering the current location in this manner is referred to as location registration here.

FIG. 7 shows the format of a downlink control signal in a wireless section transmitted by a conventional wireless base station. In the same figure, 71-7
4 is an identification signal, 91 is a downlink control signal frame, and 92 is a time slot for signal transmission.

Further, FIG. 8 shows a conventional wireless zone configuration and points where a mobile station performs a location registration operation. In the figure, 1 to 8 are radio base stations, 1 to 1B are radio zones, 21 to 24 are location registration areas, 41 is a mobile station, and 52 to 54 are points where the information content of the signal has changed.

In FIG. 8, a location registration area 21 includes a wireless zone 11 of a wireless base station 1 and a wireless thin line 12 of a wireless base station 2. A device registration area 22 includes a wireless zone 13 of a wireless base station 3 and a wireless base station 4. The device registration area 23 consists of the wireless zone 14 of the wireless base station 5.
The device registration area 24 is composed of the radio zone 16 of the radio base station 6 and the radio zone 17 of the radio base station 7 and the radio zone 18 of the radio base station 8.

A wireless zone refers to the range of wireless signals transmitted by a wireless base station, and a mobile station located within a certain wireless zone is
Only radio signals transmitted from radio base stations forming the radio zone are received. A location registration area is one or more wireless zones that are logically combined as one unit, and when a mobile station or a location registration area is used as a unit for location registration operations and a call connection is made, the mobile station is It is a unit for calling.

In the conventional method, the configuration of the location registration area corresponding to the moving speed of the mobile station (the moving speed of cars, trains, etc.) is not considered, so as shown in Figure 7, the downlink control signal is dependent on the speed of the mobile station. It is the same regardless.

A time slot 92 for signal transmission in a downlink control signal frame 91 from a radio base station to a mobile station controls any mobile station regardless of the mobile station's moving speed.

Therefore, in time slot 92, radio base station 1 and radio base station 2 transmit an identification signal 71 that identifies the area of location registration area 21 to which each radio base station belongs. Radio base station 3 and radio base station 4 are in time slot 92,
Each radio base station transmits an identification signal 72 that identifies the area of the location registration area 22 to which it belongs. Wireless base station 5
In the time slot 92, the radio base station 6 transmits an identification signal 73 that identifies the area of the location registration area 23 to which each radio base station belongs. Radio base station 7 and radio base station 8 transmit in time slot 92 an identification signal 74 that identifies the location registration area 24 to which each radio base station belongs.

As a result, position registration is performed three times at points 52, 53, and 54 where the information content of the signal has changed in FIG.

[Problem to be solved by the invention]

However, for example, in FIG. 8, if the signal length required for one location registration operation of an arbitrary mobile station is denoted by Ta, and the time required for the movement step 51 of the mobile station 41 is Ta, then the mobile station 41
The average transmission capacity of the wireless section required to transmit the total signals transmitted by the station is 3L/Ta due to three location registrations. On the other hand, since the total signal amount 3L transmitted by the mobile station 41 is constant regardless of the speed of the mobile station, the average transmission capacity required when the mobile station 41 travels the distance 51 at a moving speed of m times is 3Lm. /Ta. That is, in the conventional technology,
There has been a problem in that the transmission capacity required for the radio section increases in proportion to the moving speed of the mobile station.

The present invention has been devised in view of the above points, and an object of the present invention is to reduce changes in the transmission capacity required for a wireless section when the moving speed of a mobile station changes.

[Means to solve the problem]

FIG. 1 shows a diagram explaining the principle of the present invention.

One or more mobile stations 101 that have one or more wireless base stations 100 and make call connections via the wireless base stations 100, or one that is set between the wireless base stations 100 and
In a cellular radio telephone that performs automatic location registration using one or more control signal transmission channels, the radio base station 100 has a location registration area that varies in size depending on the moving speed of the mobile station 101. a transmission means 102 for transmitting information for identifying the mobile station 101 to the mobile station 101 in a location registration area identification signal transmission area provided corresponding to the location registration area and the moving speed;
There is a location registration means 103 for identifying the location registration area in which the mobile station 101 is located based on a signal identifying the location registration area identification signal transmission area transmitted from 01 and performing location registration. The mobile station 101 also includes a moving speed detecting means 104 for detecting its own moving speed, a receiving means 105 for selectively receiving only the information content of the location registration area identification signal transmission region corresponding to the detected moving speed, and a location registration The mobile station 101 also includes a transmitting means 106 for simultaneously transmitting a signal for identifying the location registration area identification signal transmission area received by the mobile station 101.

[Effect]

The present invention changes and sets the size of the location registration area in advance according to the speed of each mobile station. For example, when the speed of the mobile station becomes faster and the time required for the movement becomes shorter, location registration is performed. By setting a large area, the amount of signals transmitted by the mobile station is reduced.

Therefore, the required transmission capacity changes depending on the speed.

〔Example〕

FIG. 2 shows a location registration area configuration according to an embodiment of the present invention. In the figure, the same components as those in FIG. 8 are given the same reference numerals, and the explanation thereof will be omitted. In the figure, a location registration area 21 is composed of a wireless zone 11 of wireless base station 1 and a wireless zone 12 of wireless base station 2. Similarly, the location registration area 22 includes the wireless zone 13 of the wireless base station 3 and the wireless zone 14 of the wireless base station 4. The device registration area 23 includes the wireless zone 15 of the wireless base station 5 and the wireless zone 14 of the wireless base station 6. A device registration area 24 consisting of 16 radio base stations 7
The device registration area 31 is made up of the wireless zone 18 of the wireless base station 8 and the wireless zone 18 of the wireless base station 8. The device registration area 31 is made up of the location registration area 21 and the location registration area 22. Similarly, location registration area 32
is composed of a location registration area 23 and a location registration area 24.

For example, the mobile station 41 moves within these location registration areas by arrow 5.
1. At this time, the moving speed range is set. For example, mode A is a moving speed range when moving at a relatively low speed, and mode B is a moving speed range where the moving speed is relatively high and faster than mode A. As a result, location registration area 21
, 22.23.24 are location registration areas applied to mobile stations moving at relatively low speeds (mode A),
Location registration areas 31 and 32 are location registration areas applied to mobile stations that move faster than mode A (mode B).

FIG. 3 shows the structure of a downlink control signal frame transmitted by a wireless base station according to an embodiment of the present invention. This embodiment shows a method in which location registration area identification signal transmission areas are made to correspond to time slots, and the time slots are transmitted by time division multiplexing.

In the figure, 61 is a signal frame transmitted by the wireless base station;
2 is a control code indicating the beginning of a signal frame, 63 is a time slot for transmitting a location registration area identification signal to a mobile station at a certain mobile station speed, and 64 is a mobile station that moves faster than the mobile station that refers to time slot 63. a time slot for transmitting a location registration area identification signal to the mobile station; 6;
5 transmits a location registration area identification signal to a mobile station that moves faster than the mobile station that refers to time slot 64.
This is the time slot. As shown in the figure, one radio base station provides time slots 63, 64, and 65 for transmitting control signals in the downward direction. The moving speed of the mobile station is detected by information from a car's speedometer, by detecting changes in the geomagnetic field, or by a switch set by the user in accordance with the speed. The time slots to be referenced are distinguished according to the moving speed of the mobile station detected as described above. The moving speed of the mobile station is classified into a plurality of moving speed ranges, and the moving speed ranges are herein referred to as moto A, mode B, mode C1, . . . , mode n.

FIG. 4 shows the information content of a control signal transmitted in the downlink direction by a wireless base station according to an embodiment of the present invention. This figure shows the location registration area configuration of FIG. 2 and the contents of downlink control signals transmitted by each radio base station according to the signal format of FIG. 3.

FIG. 4(A) shows control signals transmitted by the radio base station 1 and the radio base station 2. The radio base stations 1 and 2 transmit a location registration area identification signal 71 for mode A in a time slot 63 provided for a mode A mobile station. Furthermore, the radio base station 1.2 transmits a position registration area identification signal 81 for mode B in a time slot 64 provided for a mode B mobile station.

FIG. 4(B) shows control signals transmitted by the radio base station 3 and the radio base station 4. The radio base station 3.4 is a time slot provided for mode A mobile stations.

Toro 3 transmits a location registration area identification signal 72 for mode A. Furthermore, the radio base station 3.4 transmits a location registration area identification signal 81 for mode B in a time slot 64 provided for a mode B mobile station.

FIG. 4(C) shows control signals transmitted by the radio base station 5 and the radio base station 6. The radio base station 5.6 has a time slot provided for a mode A mobile station;
A location registration area identification signal 73 is transmitted. The radio base station 5.6 has a time slot 64 provided for a mode B mobile station and a location registration area identification signal 82 for mode B.
Send.

FIG. 4(D) shows control signals transmitted by the wireless base station 7 and the wireless base station 8. The radio base station 7.8 transmits a mode A location registration area identification signal 74 in a time slot 63 provided for a mode A mobile station. Furthermore, the radio base station 7.8 transmits a mode B location registration area identification signal 82 in the time slot 64 provided for the mode B mobile station.

FIG. 5 shows location registration points when a mobile station according to an embodiment of the present invention moves at a low speed. In this figure, the same components as in FIG. 2 are denoted by the same reference numerals, and their explanations will be omitted. In the figure, 52, 53, and 54 are points where location registration is performed.

Since the mobile station 41 only refers to the time slot 63 corresponding to mode A in FIG.
Location registration is performed at 2.53.54. When the mobile station 41 transmits a location registration request signal to the radio base station, the mobile station adds information indicating that it has performed location registration based on the location registration identification signal of mode A. Identify the location registration area where the station is located.

FIG. 6 shows location registration points when a mobile station according to an embodiment of the present invention moves at high speed. In this figure, the same components as in FIG. 2 are denoted by the same reference numerals, and their explanations will be omitted. This is a case where the mobile station 41 moves 51 at the moving speed of mode B, and 53 is a location registration point. Since the mobile station 41 refers only to the time slot 64 corresponding to mode B in FIG. 4, location registration is performed only at a point 53 where the information content of the time slot 64 changes as the mobile station moves. When the mobile station 41 transmits a location registration request signal to the radio base station, the mobile station 41 adds information indicating that the location registration has been performed based on the location registration identification signal of mode B. The location registration area where the mobile station 41 is located is identified.

In FIG. 5, the time required for the mobile station 41 to move is long, but the amount of green signals sent out is large; in FIG. 6, the time required for the mobile station 41 to move is short, or the amount of signals sent out is small.

In Figures 5 and 6, one mobile station 4
Let L be the length of the signal sent by 1. The time required for the mobile station 41 to move in FIG. 5 is Ta, and the time required for the mobile station 41 to move in FIG. 6 is Tb.

In the example of FIG. 5, the transmission capacity required for the wireless section to transmit the signal sent out by the mobile station 41 is 3L/Ta. In the example shown in FIG. 6, the transmission capacity required of the wireless base station to transmit the signal sent by the mobile station 41 is L/Tb. Therefore, Ta>Tb. For example, with the area configuration shown above, the movement speed of mode B should be set to be twice the movement speed of mode B, so on average Ta
= 2Tb), and a total of n mobile stations 41 are classified into each moto with a probability of 50%. The capacity required to transmit the location registration signal is % in the conventional method. On the other hand, the above capacity when the present invention is applied is as follows: C((3L/Ta)Xn)/2) 10(((L/Tb)Xn)/2)=C((3
L/Ta)Xn)/2)+ [((L/(Ta/
2))xn)/2]"(2-5L/Ta)xn, which means that the capacity is 80% of the conventional capacity.

However, this value may change depending on the area configuration, mode classification method, etc.

The speed changes within the same zone, and the mobile station 41
If the receiving time slot changes, a location registration operation is required. In this case, if the mobile station does not move at a constant speed but changes its speed frequently, location registration operations will be performed frequently, resulting in an increase in location registration traffic.

In such a case, the operation state of the mobile station 41 is monitored, and the operation modification of the mobile station 41 is estimated from the speed history of the mobile station 41 up to that point or the state of manually set switches, etc. By performing location registration only when the operating state is determined to be appropriate, the increase in location registration traffic can be reduced. Further, by restricting the above-mentioned speed when it changes, it is possible to avoid double location registration in which location registration is performed based on speed and location registration based on a change in the service area.

Furthermore, since location registration signals in multiple modes are transmitted to the mobile station, the amount of information transmitted from the radio base station to the mobile station increases. However, in general, signals transmitted to wireless base stations or mobile stations are designed to have sufficient transmission capacity without collisions due to random access. Therefore, an increase in the amount of information transmitted from the radio base station to the mobile station 41 does not pose a major problem.

In the embodiment, a method of transmitting the location registration area identification signal transmission area in correspondence with time slots in time division multiplexing has been shown, but as a modified example, it may be transmitted by frequency multiplexing.

According to the present invention, the size of the location registration area is changed depending on the means of transportation of the mobile station (railway, bus, car, foot, etc.) (i.e., the location registration area is made larger for a mobile station that has a long distance to travel). )be able to.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the change in the transmission capacity required for the radio section when the moving speed of the mobile station changes, and also because the frequency of location registration of the mobile station is reduced. It has the advantage of reducing the power consumption of the mobile station and allowing it to operate for a longer period of time when using a battery than when conventional technology is applied.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention. FIG. 2 is a diagram showing the location registration area configuration of an embodiment of the present invention. FIG. 3 is a downlink control signal transmitted by a wireless base station of an embodiment of the present invention. FIG. 4 is a diagram showing the information content of a control signal transmitted in the downlink direction by a wireless base station according to an embodiment of the present invention, and FIG. 5 is a diagram showing a frame structure of a mobile station according to an embodiment of the present invention. FIG. 6 is a diagram showing a location registration point when a mobile station according to an embodiment of the present invention moves at a high speed. FIG. 7 is a diagram showing a location registration point when a mobile station according to an embodiment of the present invention moves at a high speed. FIG. 8 is a diagram showing a conventional wireless zone configuration and a point where a mobile station performs a location registration operation. 100... Wireless base station, 101... Mobile station, 102
. . . Transmission means, 103 . . . Location registration means, 104.
...Moving speed detection means, 105...Receiving means, 41.
...Mobile station, 52-54...Location registration point, 61...
・Signal frame, 63-65...Time slot, 8
1-82... Location registration area identification signal. Patent Applicant Nippon Telegraph and Telephone Co., Ltd. Diagram for explaining the principles of the present invention. Figure 1. Diagram showing location registration points when a mobile station according to an embodiment of the present invention moves at low speed. Figure 1: Movement according to an embodiment of the present invention. Diagram showing location registration points when a station moves at high speed. Control signals transmitted by base stations 1 and 2. Control signals transmitted by base stations 5 and 6. Radio transmitted by conventional wireless base stations. Diagram showing the downlink control signal format of the section Diagram showing the conventional radio synchronization system and the point where the mobile station performs location registration operation

Claims (1)

[Claims] One or more mobile stations that have one or more wireless base stations and make call connections via the wireless base stations are set up between one or more mobile stations and the wireless base station. Alternatively, in a cellular radio telephone that performs automatic location registration using a plurality of control signal transmission channels, the radio base station identifies location registration areas that vary in size depending on the moving speed of the mobile station. transmission means for transmitting information for the location registration area to the mobile station in a location registration area identification signal transmission area provided corresponding to the location registration area and the moving speed; and a location registration area identification signal transmitted from the mobile station. and a location registration means for identifying and registering a location registration area in which the mobile station is located based on a signal identifying a signal transmission area, and the mobile station has a moving speed that detects its own moving speed. a detecting means, a receiving means for selectively receiving only the information content of a location registration area identification signal transmission area corresponding to the detected moving speed, and a receiving means for identifying the location registration area identification signal transmission area received by the mobile station at the time of location registration. A location registration area configuration system comprising: transmitting means for transmitting signals together;