AU712162B2 - Radio control signal transmission method for a personal digital radio communication system - Google Patents
Radio control signal transmission method for a personal digital radio communication system Download PDFInfo
- Publication number
- AU712162B2 AU712162B2 AU48105/96A AU4810596A AU712162B2 AU 712162 B2 AU712162 B2 AU 712162B2 AU 48105/96 A AU48105/96 A AU 48105/96A AU 4810596 A AU4810596 A AU 4810596A AU 712162 B2 AU712162 B2 AU 712162B2
- Authority
- AU
- Australia
- Prior art keywords
- channel
- control
- base station
- control signal
- channel status
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/725—Cordless telephones
- H04M1/72502—Cordless telephones with one base station connected to a single line
- H04M1/72505—Radio link set-up procedures
- H04M1/72508—Radio link set-up procedures using a control channel
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Description
S F Ref: 332090
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
000.
*fee a 00 *at 0 0 *5 0* 0 00. Name and Address of Applicant: NEC Corporation 7-1, Shiba Minato-ku Tokyo
JAPAN
Hitachi, Ltd.
6, Kanda Surugadai 4-chome Chiyoda-ku Tokyo
JAPAN
Nippon Telegraph and 19-2, Nishi-Shinjuku Shinjuku-ku Tokyo
JAPAN
Telephone Corporation 3-chome Oki Electric Industry Co., Ltd.
7-12, Toranomon 1-chome Minato-ku Yokyo
JAPAN
Actual Inventor(s): Address for Service: Invention Title: Noriaki Nagashima, Yoshinori Kuroki, Kazuyuki Tate and Akihiro Sawada.
Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Radio Control Signal Transmission Method for a Personal The following statement is a full description of this invention, including the best method of performing it known to me/us:-
FI
1A RADIO CONTROL SIGNAL TRANSMISSION METHOD FOR A PERSONAL DIGITAL RADIO COMMUNICATION
SYSTEM
BACKGROUND OF THE INVENTION i. Field of the Invention: The present invention relates to a radio control signal transmission method of personal digital radio communication system composed of a mobile station and base station wire-connected to electronic communication circuit equipment.
ir 2. Description of the Related Art: see In the case of second-generation cordless telephone systems (Personal Handy phone Systems), which constitute one example of the practical application of digital radio technology in Japan, the first edition of PHS specifications RCRSTD-28 (December 20, 1993) does not stipulate a carrier sense capability for recognizing an available channel (frequency and time slot).
eeoee Based on the rules and regulations of the FCC (Federal Communications Commission), it is standard practice in the United States for US PCS (Personal Communications Services) to employ carrier sense for recognizing an available channel (frequency or time slot) even at the start of transmission on a control channel, to monitor in advance the channel status, the control frequency or time slot, intended for p.
2 use, confirm that the frequency is not being used, and then transmit on the control channel.
In control channel transmission for personal use, such as in the Personal Handy phone System (PHS) for home- or office-use in Japan, carrier sense as practiced by the US PCS is not employed. Rather, a control channel of a base station is individually set for each base station at the time of installation, and as a result, adjacent base stations are asynchronous, con- (0 trol frequencies coincide, oyerlapping of slot timing occurs between base stations, and radio interference is produced. Consequently, at the time of installation, the setting of control frequency is presently carried out while checking for the presence of radio interference. Although the installation time for a personal-use base station can be shortened by employing carrier sensing before transmitting on a control channel, as is required in the US, control channels rarely become unusable as long as the arrangement of base stations in the vicinity does not change, and carrier sensing therefore need not be employed before every transmission on a control channel.
SUMMARY OF THE INVENTION The object of the present invention is to provide a radio control signal transmission method other than 3 carrier sensing for preventing the occurrence of interference in control channels in a personal digital radio communication system, and a personal digital radio communication system using such a method.
Another object of the present invention is to provide a radio control signal transmission method for a digital radio communication system that limits monitoring of control channels to a minimal level, and a personal digital radio communication system using such a method.
The personal digital radio communication system according to the present invention includes steps for monitoring in advance the status of all channels, available frequencies and time slots for control 15 use, and selecting from among the monitored channels an 0, 0., unused channel when transmitting on a control channel between a base station and a mobile station; and a step for using the selected unused channel and transmitting on the control channel.
With the present invention, control-use frequencies of adjacent personal base stations need not be identified when installing a personal base station to avoid radio interference, and a personal base station can be freely established without the necessity of selecting frequencies differing from those of adjacent personal base stations. Moreover, the invention allows a reduction of the time and expense required for installing a base station.
According to an embodiment of the present invention, there is provided a radio control signal transmission method of a personal digital radio communication system including a mobile station and a base station wired to electronic communication circuit equipment, the method comprising the steps of: monitoring, in advance of transmission of a control signal on a control channel between said base station and said mobile station, channel status of usable channel control frequencies and time slots; selecting an unused channel from among the monitored channels; and transmitting the control signal on the selected unused channel as the control channel.
According to another embodiment of the present invention, there is provided a personal digital radio communication system, comprising: a mobile station and a base station wire-connected to electronic communication 15 circuit equipment, said base station having a radio device that monitors, in advance of transmission of a control signal on a control channel between said base station and said mobile station, channel status of usable channel control frequencies and time slots, confirms availability of monitored control frequencies and time slots, and initiates °transmission of the control signal on an available control channel.
20 According to still another embodiment of the present invention there is provided a C C personal digital radio communication system, comprising: a mobile station and a base station wire-connected to electronic communication circuit equipment, said mobile station having a radio device that monitors, in advance of transmission of a control signal on a control channel between said base station and said 25 mobile station, channel status of usable channel control frequencies and time slots, S" confinnrms availability of monitored control frequencies and time slots, and initiates transmission of the control signal on an available control channel.
The above and other objects, features, and advantages of the present invention will become apparent from the following description with references to the accompanying drawings which illustrate examples of the present invention.
[R:\LIBPP]0 1636.doc:IAD -1 Brief Description of the Drawings Fig. 1 shows the configuration of one embodiment of the personal digital radio communication system of the present invention; Fig. 2 shows the configuration of the base station of Fig. 1; Fig. 3 is a flow chart illustrating a command to The next page is page 7 [R:\LIBPP]01636.doc:IAD EDITORIAL NOTE NUMBER 48105/96 THIS SPECIFICATION DOES NOT CONTAIN A PAGE NUMBERED 6.
I
7 monitor control channels.
*r S DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to Fig. i, the personal digital radio communication system of the present invention is made up of mobile stations PSI-PS3 and base stations BSI-BS3 wire-connected to an independent communication network or public communication network NW. Area i, Area 2, and Area 3 are the radio-wave ranges of base station BS1, base station BS2, and base station BS3, respectively.
Referring to Fig. 2, base stations BSI-BS3 are each constructed of: a radio section i, a power-ON detector 5 that detects powering-up of that base station and sends out a request to generate a monitor command; a call-not-accepted detector 6 that counts the number of times calls cannot be accepted and sends out a request to generate a monitor command when the count value exceeds a set value; a fixed-time timer 7 that sends out a request to generate a monitor command upon each passage of a fixed time interval; a channel status monitor 2 that, when transmitting on a control (for communication) channel to a mobile station, monitors in advance the channel status of all available control (for communication) frequencies and time slots, selects an unused channel from among the monitored channels, and transmits by way of radio section 1; a control I I
C
8 channel status monitor command section 3 that activates channel status monitor 2 in response to a request to generate a monitor command from power-ON detector call-not-accepted detector 6, and fixed time timer 7; and a communication-use channel status monitor command section 4 that activates channel status monitor 2.
A Frame Error Rate (FER) measurement method may be employed as a method of retrieving available control channels in channel status monitor 2. In other words, available control frequencies and time slots are monitored in advance; the number of errors in the monitor data is stored; of the stored data, the best frequency and time slot having the fewest number of errors are calculated and fixed, and that time slot is used in transmitting from radio section i.
Monitoring of frequency and time slot, and transmission on a control channel through selection of an available frequency and slot at a base station are carried out through intermittent action upon power-ON detection, upon call-not-accepted detection, and at fixed times, thereby reducing load upon the CPU.
This intermittent action can be illustrated as follows: First, if based on prior interference conditions, monitoring is essential after turning power ON following installation of the base station. This monitoring, which is activated by powering up the base 9 station following installation, enables avoidance of interference with control channels of adjacent base stations at this time.
If power to an already installed base station should for some reason be interrupted or the installation state of other base stations in the vicinity be subsequently altered, avoidance of control channel interference can again be effected by again activating channel status monitor 2 when a call fails to be ac- 1D cepted. Further, monitoring of control channels can be e: carried out at fixed time intervals such as once every day or once a week without monitoring every call.
Normally, if a base station is capable of avoiding control channel interference as described hereinabove, simply turning power ON after installation obviates frequent monitoring such as at set times or when a call cannot be accepted. However, because a base station lacking the capability to avoid control channel inter- *ference as in the present invention might possibly be established, channel status monitor 2 must be activated after installation based on a set standard of operation time. In this way, the number of times of monit6ring of control channels can be limited, and monitor circuits can be simplified by not monitoring outside these time limits.
The operation of this embodiment will next be I I 10 0:0.
*0 0 0 0 *0 *00* 0* 0 64 15 a
S
explained with reference to Fig. 3.
Power-ON detector 5 detects that the power supply to the device has been turned ON, and sends a request to generate a monitor command to control channel status monitor command section 3.
Call-not-accepted detector 6 turns ON in Step 11 and resets incoming-call number N to in Step 12. In Step 13, detector 6 judges if a call can be accepted, and if not accepted, increments the count number in Step 14. In Step 15, detector 6 judges whether the count value has exceeded the prescribed value N1 or not, again counts the number of accepted calls N if the count value has reached NI, and sends a request to generate a monitor command to control channel status monitor command section 3 when the count value exceeds the prescribed value N1.
Fixed-time timer 7 sends a request to generate a monitor command to control channel status monitor command section 3 upon each passage of a set fixed time.
These requests to generate a monitor command to control channel status monitor command section 3 cause control channel status monitor command section 3 to activate channel status monitor 2, whereby channel status monitor 2 checks the current channel status at the base station site from radio device 1 and selects a
I
11 control channel.
Although power-ON detector 5, call-not-accepted detector 6, and fixed-time timer are all shown in the figures, only the provision of power-ON detector 5 is essential, and the other two components may be omitted.
In the foregoing explanation, a radio device that monitors the channel status, confirms that a channel is available, and initiates transmission on a control channel is provided in a base station, but such a radio 99.9 9 o 18 device may also be provided on the mobile station side.
A case will be next be considered in which base o station BS2 is newly established in the vicinity of base station BSl, which is transmitting on a control S-channel. If the frequency and time slot of the control channel transmitted from base station BS2 at this time 9 coincides with that of base station BSl, collision oe between the control channels will occur where the radio-wave ranges of base stations BSl and BS2 overlap, and as a consequence, mobile stations PS1 or PS2 in the region of overlap will be unable to recognize control information and therefore become inoperable.
Such a situation has conventionally been avoided by investigating control channels in the vicinity and setting control channels which will not coincide when establishing a base station (in this instance, base station BS2). However, if power is not supplied to base 12 station BSI when base station BS2 is being established in the vicinity of base station BS1, potential interference cannot be determined at the time of installing base station BS2, and each user must be aware that interference may occur immediately after power is subsequently supplied to base station BS1.
In contrast, in the present invention, available control channels are checked before base station BS2 transmits on a control channels, and as a result, the p 1~O above-described problem of interference between control channels will not occur even when the radio-wave ranges overlap as shown in Fig. 1.
While a preferred embodiment of the present invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.
Claims (7)
1. A radio control signal transmission method of a personal digital radio communication system including a mobile station and a base station wired to electronic communication circuit equipment, the method comprising the steps of: monitoring, in advance of transmission of a control signal on a control channel between said base station and said mobile station, channel status of usable channel control frequencies and time slots; selecting an unused channel from among the monitored channels; and transmitting the control signal on the selected unused channel as the control channel.
2. A method according to claim 1, wherein monitoring of channel status of said channel control frequencies and time slots is performed in response to, at least, a request S. when a power supply to said base station is turned ON, and optionally, a request when a 15 call cannot be accepted or with each passage of a fixed time interval; and a control channel selected through channel status monitoring in response to said request is used until the next monitoring of channel status.
3. A method according to claim 1, wherein transmission of a control signal on said 20 control channel is initiated upon confirmation that a frequency and time slot are available, and if through monitoring of channel status, a frequency and time slot intended for control use are found to be in use by another station and therefore unavailable, channel status of a go o different control channel is similarly monitored, availability confirmed, and radio transmission initiated.
4. A personal digital radio communication system, comprising: a mobile station and a base station wire-connected to electronic communication circuit equipment, said base station having a radio device that monitors, in advance of transmission of a control signal on a control channel between said base station and said mobile station, channel status of usable channel control frequencies and time slots, confirms availability of monitored control frequencies and time slots, and initiates transmission of the control signal on an available control channel. [R:\LIBPPJ]01636.doc:IAD -14- A personal digital radio communication system, comprising: a mobile station and a base station wire-connected to electronic communication circuit equipment, said mobile station having a radio device that monitors, in advance of transmission of a control signal on a control channel between said base station and said mobile station, channel status of usable channel control frequencies and time slots, confirms availability of monitored control frequencies and time slots, and initiates transmission of the control signal on an available control channel.
6. A personal digital radio communication system according to claim 4 or claim wherein said radio device comprises: a power-ON detector that detects if a power supply is ON in said mobile station or said base station in which said radio device is provided, and sends out a request for generating a monitor command; said radio device optionally includes: a call-not-accepted detector that counts the number of times calls cannot be accepted, and sends out a request to generate a monitor command when the count value exceeds a set value; and go a timer that sends out a request to generate a monitor command upon each passage of a fixed time interval; 20 said radio device further includes: a channel status monitor that monitors, in advance of transmission of a control o• signal on a control channel between said base station and said mobile station channel status of available control-use frequencies and time slots, and selects an available channel from among the monitored channels; and 25 a control channel status monitor command section that activates said channel status monitor in response to a request to generate a monitor command from said power- ON detector, said call-not-accepted detector, and said timer.
7. A radio control signal transmission method substantially as herein described with reference to Figs. 1 to 3. [R:\LIBPP]01636.doc:IAD
8. A personal digital radio communication system substantially as herein described with reference to Figs. 1 to 3. DATED this eighteenth Day of August 1999 NEC Corporation Hitachi, Ltd. Nippon Telegraph and Telephone Corporation Oki Electric Industry Co., Ltd Patent Attorneys for the Applicants SPRUSON FERGUSON S e [R:\LIBPP]01636.doc:IAD
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7058875A JPH08256373A (en) | 1995-03-17 | 1995-03-17 | Radio control signal transmission system, base station, and mobile station |
| JP7-058875 | 1995-03-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU4810596A AU4810596A (en) | 1996-09-26 |
| AU712162B2 true AU712162B2 (en) | 1999-10-28 |
Family
ID=13096944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU48105/96A Ceased AU712162B2 (en) | 1995-03-17 | 1996-03-15 | Radio control signal transmission method for a personal digital radio communication system |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH08256373A (en) |
| CN (1) | CN1083229C (en) |
| AU (1) | AU712162B2 (en) |
| GB (1) | GB2300541B (en) |
| SG (1) | SG47094A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6330441B1 (en) * | 1997-03-03 | 2001-12-11 | Victor Company Of Japan, Ltd. | Communication system |
| US6941143B2 (en) * | 2002-08-29 | 2005-09-06 | Thomson Licensing, S.A. | Automatic channel selection in a radio access network |
| KR100612212B1 (en) * | 2005-06-07 | 2006-08-11 | 블루텍 주식회사 | How to prevent frequency interference of audio equipment |
| JP5211912B2 (en) * | 2008-07-24 | 2013-06-12 | 日本電気株式会社 | RADIO COMMUNICATION SYSTEM, MANAGEMENT DEVICE, MANAGEMENT DEVICE DATA PROCESSING METHOD, AND MONITORING METHOD |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5408604A (en) * | 1991-12-17 | 1995-04-18 | Hitachi, Ltd. | Display control integrated circuit for a display having an input panel |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2580129B2 (en) * | 1986-07-18 | 1997-02-12 | ソニー株式会社 | Transceiver |
| CA1250900A (en) * | 1986-11-18 | 1989-03-07 | Northern Telecom Limited | Private cellular system |
| JP2555904B2 (en) * | 1989-04-27 | 1996-11-20 | 日本電気株式会社 | Car phone system |
| JPH0834627B2 (en) * | 1989-07-24 | 1996-03-29 | 日本電気株式会社 | Channel selection method |
| FI87122C (en) * | 1990-12-04 | 1992-11-25 | Telenokia Oy | Radio |
| US5388149A (en) * | 1991-06-03 | 1995-02-07 | At&T Corp. | Method and apparatus for determining availability of a public base unit for communicating with a cordless telephone in a public cordless telephone system |
| US5373547A (en) * | 1993-06-28 | 1994-12-13 | Motorola, Inc. | Method and apparatus for radio handset spectrum range registration |
-
1995
- 1995-03-17 JP JP7058875A patent/JPH08256373A/en active Pending
-
1996
- 1996-03-15 AU AU48105/96A patent/AU712162B2/en not_active Ceased
- 1996-03-15 GB GB9605511A patent/GB2300541B/en not_active Expired - Fee Related
- 1996-03-15 SG SG1996006611A patent/SG47094A1/en unknown
- 1996-03-16 CN CN96107324.1A patent/CN1083229C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5408604A (en) * | 1991-12-17 | 1995-04-18 | Hitachi, Ltd. | Display control integrated circuit for a display having an input panel |
Also Published As
| Publication number | Publication date |
|---|---|
| AU4810596A (en) | 1996-09-26 |
| CN1137215A (en) | 1996-12-04 |
| CN1083229C (en) | 2002-04-17 |
| JPH08256373A (en) | 1996-10-01 |
| GB9605511D0 (en) | 1996-05-15 |
| GB2300541A8 (en) | 1996-11-18 |
| GB2300541A (en) | 1996-11-06 |
| GB2300541B (en) | 2000-01-12 |
| HK1011479A1 (en) | 1999-07-09 |
| SG47094A1 (en) | 1998-03-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |