JP2001078251A - Speech system for cordless phone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a link through a channel having no disturbance even when the link is started at the moment a CH group is switched in a cordless phone selecting and using a speech channel from a plurality of channels. SOLUTION: Radio frequencies are assigned to, e.g. five CH groups (one CH group consists of 5 channel), and in idle CH decision, electric field information of any channel in the same CH group covers all of the channels. Even when linking is started at the moment when another CH group is switched, the link is formed by a channel having no disturbance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call system of a cordless telephone device for selecting and using a call channel from a plurality of channels.

[0002]

2. Description of the Related Art In recent years, a cordless telephone apparatus has divided channels into a small number of groups and restricted CHs in order to shorten the link time between a base unit and a slave unit or extend the standby (standby) time of the slave unit. Scanning is being performed.

In link formation, a communication channel is determined based on available channel information stored at the time of reception scanning.

[0004] Hereinafter, a method of storing and determining unused channel information in a conventional cordless telephone device will be described with reference to the drawings.

FIG. 3 is a flow chart at the time of reception scanning and link formation in a conventional cordless telephone device, and FIG. 4 is a schematic diagram of an example of basic CH allocation in a conventional cordless telephone device.

First, radio frequencies are allocated as shown in FIG. That is, the CH interval is basically set to be constant (in the example, 360 KHz) and assigned.

As shown in FIG. 3, a channel to be scanned in the reception scan is selected, the channel is set for the PLL-IC (step 31), and a channel stabilization time is waited (step 32).

After waiting for the stabilization time, the electric field information is stored in the storage medium (step 33).

If there is no electric field, the process goes to step 35, and if there is an electric field, data from the mobile unit (cordless handset) is checked (step 34).

If there is no data, it is determined in step 35 whether all channels have been scanned, and if all channels have been scanned, the reception scan is terminated (step 38).

If not all channels have been scanned,
Step 31 to perform the next channel scan
If there is data, it is determined whether the channel is empty based on the electric field information from the previous scan (step 36).

If there is a vacancy, a link is formed with the channel as it is (step 37).

If the channel is not empty, a search is performed based on the electric field information obtained when the empty channel was previously scanned, and a link is formed (step 37).

[0014]

However, in the above-described method for storing and determining the available channel information in the conventional cordless telephone device, when the link is started at the moment when the CH group is switched, the available information of the switched CH group is saved. Since there is no link, there is a possibility of linking with a disturbed CH, and there has been a problem that the master unit must scan all the CHs in order to reliably obtain free information.

The present invention has been made in consideration of the above-described conventional problems, and has as its object to provide a communication system of a cordless telephone apparatus that forms a link on a channel without interference even when a link is started at the moment when a CH group is switched. And

[0016]

SUMMARY OF THE INVENTION The present invention provides an ID (authentication) code or a PN code to solve the above-mentioned conventional problems.
(Spreading code) means for grouping channels to be used according to the sequence, means for switching the ID code or PN sequence, means for storing channel availability information at the time of reception scan, and switching of the channel group to start scanning And a means for determining a channel to be talked to based on the available information of the channel before the channel group is switched when the link formation is started before the link formation.

According to the present invention, even when a link is started at the moment when a CH group is switched, a link can be formed on a channel without interference.

[0018]

The invention according to claim 1 of the present invention comprises means for grouping channels used by an ID (authentication) code or a PN (spreading code) sequence,
Means for switching the ID code or PN sequence;
Means for storing the channel vacancy information at the time of reception scanning, and if a link is started before the channel group is switched and scanning starts, a call is made based on the channel vacancy information before the channel group is switched. This is a communication method of a cordless telephone device provided with means for determining a channel. Even if a link is started at the moment when a CH group is switched, a link can be formed on a channel without interference.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a flowchart showing a call system of a cordless telephone apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a schematic diagram of frequency allocation.

In the following, the operation of storing and determining the available channel information in the call system of the cordless telephone device according to the first embodiment of the present invention will be described.

First, radio frequency allocation is performed as shown in FIG. That is, allocation is made to five CH groups (one CH group is composed of five channels).

As a result, since the channel interval in the same group is a very narrow interval of 120 KHz, an empty C
The H determination can be entirely covered by any one electric field information in the same group. In other words, it is possible to determine an empty channel based on the empty channel information for each group instead of the empty channel information for each channel.

The CH grouping determines which CH in the CH group to use based on an ID (authentication) code or a PN (spreading code) sequence. In the example, the PN (spreading code) sequence has five patterns and is divided into five groups.

As shown in FIG. 1, first, a group of channels to be scanned in the reception scan is selected, and the PLL-
Set the channel for the IC (Step 1)
1) Wait for a channel stabilization time (step 12).

After waiting for the stabilization time, the electric field information of the CH group is stored in the storage medium (step 13).

If there is no electric field, go to step 15; if there is an electric field, check the data from the mobile unit (cordless handset) (step 14).

If there is no data, it is determined in step 15 whether or not scanning has been performed for all CH groups. If scanning has been performed for all CH groups, the reception scan is terminated (step 18).

If all the CH groups have not been scanned, the process proceeds to step 11 to scan the next CH group. If there is data, whether or not the CH groups are empty based on the electric field information obtained in the previous scan. Is determined (step 16).

If there is a vacancy, the link is formed with the channel as it is (step 17).

If the channel is not vacant, a search is performed based on the electric field information obtained when the vacant CH group was previously scanned, and a link is formed (step 17).

As described above, according to the intercom system of the cordless telephone device of the first embodiment, even if the link is started at the moment when the CH group is switched, it is possible to form the link on the channel without interference. it can.

[0033]

As is apparent from the above description, the communication system of the cordless telephone apparatus according to the present invention comprises a means for grouping channels used by an ID (authentication) code or a PN (spreading code) sequence; Means for switching codes or PN sequences; means for storing channel free information at the time of reception scanning; and channels before the channel group is switched when link formation is started before the channel group is switched and scanning is started. Means for deciding the channel to be used for communication based on the available information, so that even if the link is started at the moment when the CH group is switched, it is possible to form a link on a channel without interference. The effect is great.

[Brief description of the drawings]

FIG. 1 is a flowchart of a call system of a cordless telephone device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of radio frequency allocation in the cordless telephone device.

FIG. 3 is a flowchart for reception scan and link formation in a conventional cordless telephone device.

FIG. 4 is a schematic diagram of an example of basic CH allocation in the cordless telephone device.

Claims (1)

[Claims] 1. A means for grouping channels to be used by an ID (authentication) code or a PN (spreading code) sequence, a means for switching the ID code or a PN sequence, and storing information on channel availability at the time of reception scanning. Means for determining a channel to be talked to based on free information of the channel before the channel group is switched when link formation is started before the scan is started after the channel group is switched. A feature of the cordless telephone system.