JPH07212827A - Location registration device and location registration method in mobile communication system - Google Patents

Abstract

(57) [Summary] [Object] In a mobile communication system using a TDMA system, in a mobile communication system capable of reducing useless battery consumption of a wireless slave device when base stations are sparsely present An object of the present invention is to provide a position registration device and a position registration method. In a wireless slave device in a TDMA mobile communication system that intermittently transmits a control channel, a level measuring unit 9 for measuring a received signal level, a density information analyzing unit 7 for analyzing density information, and storing density information. For this purpose, a storage unit 8 and a timer 11 controlled by a signal from the density information analysis unit 7 are provided, the density information is transmitted from the base station, and the wireless slave device sets a timer according to the density information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a location registration device and location registration method in a mobile communication system using the TDMA system.

[0002]

2. Description of the Related Art The development of mobile communication systems in recent years has been remarkable, and TDMA (Time Division Multipl
A mobile communication system using the e Access) method is about to be realized. The mobile communication system includes a wireless slave device, a base station that wirelessly communicates with the wireless slave device, and a center that is connected to the base station by wire and controls and controls the base station.
Hereinafter, a conventional wireless slave device will be described with reference to the drawings.

FIG. 4 is a block diagram showing the configuration of a conventional wireless slave device. Reference numeral 1 is a wireless unit that converts a control signal and a call signal into a TDMA wireless signal, 2 is a level measuring unit that measures a reception level of a wireless signal from a base station, and 3 is a control unit that controls the entire wireless slave device. Reference numeral 4 is a voice processing unit that processes a voice signal during transmission and reception, and 5 is a display unit for displaying an out-of-area display or the like under the control of the control unit 3.

The position registration operation of the conventional wireless cordless handset having the above configuration will be described below. First, in explaining the operation, the structure of the radio signal will be described. Figure 3
FIG. 6 is a configuration diagram of a wireless signal of a conventional wireless slave device. Here, the communication system is the TDMA system, which is composed of frames. A frame is divided into a number of slots, and communication is performed independently for each slot. The slot has a control slot and a communication slot. Here, the frame is composed of one control slot and several communication slots. A broadcast channel (BCCH), a paging channel (PCH), an individual control channel (SCCH), etc. are assigned to the control slot. These channels are collectively called control channels. Here, the base station uses BCCH, PCH,
The SCCH or the like is transmitted intermittently. BCCH, PCH, and SCCH are repeatedly transmitted in a fixed order when performing intermittent transmission in the control slot. This one cycle is called a super frame. Of these, the BCCH includes superframe structure information and transmission interval information, and the wireless slave device must first receive this signal for communication.

FIG. 5 is a flowchart of the operation of the conventional wireless slave device. First, when the power of the wireless slave device is turned on (# 1), the control unit 3 sets a frequency for the wireless unit 1 and acquires superframe synchronization (# 2). When the superframe is synchronized, the control unit 3 registers the location with the base station (# 3). After the location registration, the wireless handset receives the control channel intermittently. At this time, the control unit 3 is monitoring the control channel by the level measuring unit 2. If the super frame synchronization cannot be achieved, the display area 5 is displayed outside the area (# 5) and the super frame synchronization is again obtained.

When the wireless slave device moves and the reception level of the control channel falls below the threshold value, the level measuring unit 2 sends a signal to the control unit 3 that the reception level has deteriorated. As a result, the control unit 3 searches for a new location registration base station until it is found (# 4).

[0007]

However, in the above-mentioned conventional system, when base stations are sparsely present and superframe reception is not possible, location registration is possible despite the low probability of superframe reception. As described above, there is a problem that power is wasted in order to obtain superframe synchronization many times.

Therefore, the present invention solves the above problems and provides a location registration device and a location registration method in a mobile communication system which can reduce wasteful battery consumption when base stations are sparsely present. To aim.

[0009]

To this end, the present invention provides a density information analysis unit for analyzing density information from a base station, a storage unit for storing this density information, and a density information analysis unit. And a timer controlled by the control unit in response to the signal No. 1, the density information is transmitted from the base station, and the wireless slave device sets the timer according to the density information.

[0010]

With the above configuration, when the density information is sent from the base station, the density information analysis unit analyzes the information and obtains the density information. At the same time that this density information is stored in the storage unit,
The control unit sets the timer value according to the density information and operates the timer for repositioning.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a wireless slave device according to an embodiment of the present invention. Reference numeral 6 is a radio unit for converting a control signal and a call signal into a TDMA radio signal, and 7 is a density information analysis unit for reading and analyzing the base station density information in the received control channel to obtain the base station density information. , 8 is a storage unit for storing the density information obtained by the density information analysis unit 7, 9 is a reception level of the control channel and the communication channel received by the wireless unit 6, and sends the result to the control unit 10 described later. Level measuring unit for 10
Receives the information from the density information analysis unit 7 and the level measurement unit 9 and controls the timer 11, and also the wireless unit 6 and the voice processing unit 1
A control unit for controlling the operation of the entire wireless slave device such as 2.
Reference numeral 1 is a timer controlled by the control unit 10, 12 is a voice processing unit that performs voice-related processing, and 13 is a display unit for displaying an out-of-area display or the like under the control of the control unit 10.

The operation of the wireless slave device configured as described above will be described in detail below with reference to FIGS. 1 and 2. Here, the density information is transmitted by the broadcast channel intermittently transmitted from the base station. This density information is information about how densely the base stations are. For example, the fact that the density information is sparse means that a certain base station is isolated without other base stations. Means FIG. 2 is a flowchart of the operation of the wireless slave device according to the embodiment of the present invention, which will be described below.

First, the power of the wireless slave device is turned on (# 1), and then the control unit 10 in the wireless slave device acquires superframe synchronization from the wireless unit 6 (# 2). Here, when the superframe synchronization with the highest reception level is established, the radio section 6 receives the broadcast channel containing the base station density information, sends the information to the density information analysis section 7, and the density information analysis section 7 The density information according to the local density is obtained (# 3). The control unit 10 receives the density information and determines that the conditions for location registration are satisfied, and performs location registration with the base station (# 4).
Then, the control unit 10 monitors the reception level (# 5). After that, the control unit 10 judges the current density information and performs the following operation.

When the super frame is received (# 2), the same operation as the conventional example is performed. However, if the wireless unit 6 fails to receive the super frame during the superframe reception (# 2), the wireless unit 6 reports to the control unit 10 that the reception is impossible, and the control unit 10 notifies the storage unit 8 of the previous density. Read information. The control unit 10 issues a different command depending on the previous density information (# 6). When the previous density information is dense in # 6, the control unit 10 sets the timer 11 (t = x) (t = x) (# 7) and simultaneously operates the timer 11. When timer 11 ends (#
8) The control unit 10 goes to superframe synchronization,
When the synchronization is not succeeded N times in succession, the previous density information in the storage unit 8 is reduced (# 9, # 10), and the density information in the storage unit 8 is rewritten. Then go to superframe synchronization.

If the previous density information is medium in # 6,
The same operation as when the previous density information is dense is performed (# 11
~ # 14), the set time of the timer 11 becomes long (t =
y, y> x).

When the previous density information is sparse in # 6,
The control unit 10 sets a timer set (t
= Z, z> y) is performed (# 15), and the timer 11 starts operating. When the timer 11 ends (# 16), the control unit 1
0 goes to the superframe synchronization, and when the synchronization is not succeeded N times, the control unit 10 displays the outside area display on the display unit 13 (# 17, # 18).

According to the above method, useless location registration can be eliminated and battery consumption can be saved by reducing location registration retries when the density of base stations is low. Figure 2
In order to make the operation of the wireless slave device easy to understand, the flow chart of (3) is divided into three stages of dense, medium, and sparse, but in actual operation, the density information may be divided into any number of stages.

[0018]

As described above, according to the present invention, a density information analysis unit for analyzing density information coming from a base station, a storage unit for storing this density information, and a signal from the density information analysis unit. By providing a timer controlled by the control unit, the number of location registrations of wireless handsets for a certain period of time is changed according to the density of base stations to reduce the number of location registrations within a certain period of time when the base stations are sparse. This eliminates wasteful location registration and reduces wasteful battery consumption.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a wireless slave device according to an embodiment of the present invention.

FIG. 2 is a flowchart of the operation of the wireless slave device according to the embodiment of the present invention.

FIG. 3 is a configuration diagram of a wireless signal of a conventional wireless slave device.

FIG. 4 is a block diagram showing a configuration of a conventional wireless slave device.

FIG. 5 is a flowchart of the operation of a conventional wireless slave device.

[Explanation of symbols]

 6 wireless unit 7 density information analysis unit 8 storage unit 9 level measuring unit 10 control unit 11 timer 12 voice processing unit 13 display unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location H04Q 7/38 7605-5K H04B 7/26 X 7605-5K 107 7605-5K 109 N

Claims (2)

[Claims] 1. A wireless slave unit in a TDMA mobile communication system for intermittently transmitting a control channel, a level measuring unit for measuring a received signal level, a density information analyzing unit for analyzing density information, and a density information. A storage unit for storing a timer, a timer controlled by a signal from the density information analysis unit, and a control for receiving the information from the level measurement unit and the density information analysis unit to control the timer and the entire wireless slave device. A location registration device in a mobile communication system, characterized in that a unit is provided. 2. A level measuring section for measuring a received signal level, a density information analyzing section for analyzing density information, and a density information in a wireless slave unit in a TDMA type mobile communication system for intermittently transmitting a control channel. A storage unit for storing the, and a timer controlled by a signal from the density information analysis unit is provided, the density information is transmitted from a base station, and the wireless slave device sets a timer according to the density information. A location registration method in a characteristic mobile communication system.