JP2885679B2 - Communication Channel Assignment Method for Simplified Mobile Phone System - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication channel allocating method in a simplified portable telephone system (PHS), and more particularly to a home-use communication system in which a master unit and a slave unit each constituted by a one-slot radio are used. In PHS, the present invention relates to a communication channel allocation method in PHS in which a base unit allocates a communication channel based on a result of a process of searching for a free channel of a slave unit.

[0002]

2. Description of the Related Art An empty channel search process of a base unit can be easily realized by a base unit composed of four-slot radios, but it can be easily realized by a home-use base unit composed of a one-slot radio. In the PHS, when communication is performed between a master and a slave, when a link channel establishment request is transmitted from the slave to the master, the master transmits a link channel assignment signal to the slave, and thereafter the master Searched for a free channel and assigned a communication channel.

FIG. 4 is a format diagram of a link channel establishment request signal in a PHS in which a master unit is constituted by a conventional one-slot wireless device.

Referring to FIG. 4, the first octet of the first
Bits to the seventh bit indicate the message type, the second octet indicates the extended link channel (extended LCH) protocol type from the first bit to the third bit, and the fourth and fifth bits indicate the link channel (LCH) protocol. The type is the LCH type from the sixth bit to the eighth bit, and the third octet is the radio management (RT: Radio frequency) from the first bit to the third bit.
(Transmission management)
・ Mobility management (MM: Mobility Management)
ent) protocol version, the seventh bit and the eighth bit indicate a call control (CC) protocol type, and the eighth bit of the first octet and the fourth to sixth bits of the third octet are reserved, respectively. Is shown.

The fourth octet indicates the area information notification status number from the first bit to the third bit, the reservation information from the fourth bit to the eighth bit, and the fifth octet indicates the first bit and the second bit. Bits are optional.

[0006]

In this conventional PHS, there is no means for notifying the parent device of the information of the empty channel obtained by performing the empty channel search in the child device.
There is a problem that only the parent device can set a communication channel, although the search for an empty channel is performed by both the parent device and the child device.

An object of the present invention is to provide a communication channel allocation system in a PHS for notifying a base unit of information on a free channel obtained by performing a search for a free channel in a slave unit when the base unit is constituted by a one-slot wireless device. Is to provide.

[0008]

According to the present invention, in a home PHS constituted by a one-slot wireless device, when the master device communicates with the slave device, the slave device searches for an empty channel. Perform a link channel establishment request to notify the free channel and slot information to the base unit, and the base unit allocates a communication channel based on the free channel information notified from the slave unit. P
A communication channel assignment scheme in the HS is obtained.

[0009] The master unit may be a first wireless unit that performs wireless communication with the slave unit, and a first slot switching unit that switches a slot to search for an empty channel in the first wireless unit. Unit, a reception level measuring unit for measuring a reception level at the first wireless unit, and a first microprocessor for performing selection control of the idle channel, wherein the slave unit is connected to the master unit. A second wireless unit for performing wireless communication, a second slot switching unit for switching a slot for searching for an empty channel in the second wireless unit, and a second microprocessor for performing selection control of the empty channel And a communication channel allocation method in the PHS is provided.

[0010]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a system block diagram showing the configuration of a PHS according to an embodiment of the present invention. FIG. 2 is a format diagram of a link channel establishment request signal in FIG. 1. FIG. 6 is a sequence chart showing an operation sequence of FIG.

First, referring to FIG. 1, P
The HS is composed of a base unit 1 configured by a one-slot wireless device and a slave unit 2 that communicates with the master device 1. The base unit 1 includes a wireless unit 11 and an idle channel for the wireless unit 11. Slot switching unit 12 that switches slots to perform search of the reception, and reception level measurement unit 1 that measures the reception level in the radio unit 11
3 and a microprocessor 14 for controlling the selection of an empty channel. The slave unit 2 includes a radio unit 21, a slot switching unit 22 for switching a slot for the radio unit 21 to search for an empty channel, And a microprocessor 24 for performing selection control.

Next, referring to FIG. 2, in the slave unit 2 of the present embodiment, the slot designation number is added to the sixth and seventh bits of the fourth octet of the link channel establishment request signal.
Also, a channel number is added to the first to eighth bits of the fifth octet and transmitted to base unit 1.

The fourth bit of the fourth octet and the fifth bit
The bit indicates an option, and the signal format of the other octets is the same as the conventional signal format shown in FIG.

Next, the operation of this embodiment will be described with reference to FIG.

When a connection request such as an outgoing call or an incoming call is issued to the slave unit 2, the microprocessor 24 searches for a free channel, adds a channel number and a slot designation number to a link channel establishment request signal, and 21 to the base unit 1.

In the base unit 1, the reception level measuring circuit 13 measures the reception level based on the information of the link channel establishment request signal received from the slave unit 2, and further selects a communication channel specified by the channel number. Slot switching unit 1
2, the communication channel is switched, and a link channel assignment signal is transmitted to the slave unit 2.

The slave unit 2 receives the link channel assignment signal from the master unit 1, and the microprocessor 24 instructs the slot switching unit 22 to switch the communication channel. As a result, communication between master device 1 and slave device 2 is started.

[0019]

As described above, according to the present invention, in a home PHS constituted by a one-slot wireless device, when the master device communicates with the slave device, the slave device searches for an available channel. The base station notifies the base unit of the information of the empty channel and the slot by the link channel establishment request, and the base unit allocates a communication channel based on the information of the free channel notified from the slave unit. A first wireless unit that performs wireless communication between the first wireless unit, a first slot switching unit that switches a slot in order to search for an empty channel in the first wireless unit, and a reception level of the first wireless unit. The slave unit includes a reception level measurement unit for measuring, and a first microprocessor for performing selection control of an idle channel, wherein the slave unit performs a wireless communication with the master unit, and the second wireless unit. Empty channels in the department A second slot switching unit for switching a slot in order to perform the search, by providing a second microprocessor for selecting the control idle channel, the search processing of the available channel at the base-side is reduced, 1
This has the effect of simplifying the device configuration of the master unit in the slot radio and reducing costs.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing a configuration of a PHS according to an embodiment of the present invention.

FIG. 2 is a format diagram of a link channel establishment request signal in FIG.

FIG. 3 is a sequence chart showing an operation sequence from a search for a free channel to the start of communication in FIG. 1;

FIG. 4 is a diagram illustrating a conventional P-based wireless device having a one-slot wireless device.
It is a format diagram of a link channel establishment request signal in HS.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 master unit 2 slave unit 11, 21 wireless unit 12, 22 slot switching unit 13 reception level measurement circuit 14, 24 microprocessor

Claims (2)

(57) [Claims] 1. A home-use portable cellular phone system comprising a one-slot wireless device, wherein when the master device communicates with the slave device, the slave device searches for an empty channel and requests a link channel establishment. And informs the master unit of the information of the empty channel and slot, and the master unit allocates a communication channel based on the information of the empty channel notified from the slave unit. Communication channel assignment method. 2. A first wireless unit for performing wireless communication with the slave unit, and a first slot switching unit for switching a slot for the first wireless unit to search for an empty channel. Unit, a reception level measuring unit for measuring a reception level at the first wireless unit, and a first microprocessor for performing selection control of the idle channel, wherein the slave unit is connected to the master unit. A second wireless unit for performing wireless communication, a second slot switching unit for switching a slot for searching for an empty channel in the second wireless unit, and a second microprocessor for performing selection control of the empty channel The communication channel allocation method in the simplified portable telephone system according to claim 1, comprising: