GB2321828A - Changing a control channel in a cellular system - Google Patents
Changing a control channel in a cellular system Download PDFInfo
- Publication number
- GB2321828A GB2321828A GB9725989A GB9725989A GB2321828A GB 2321828 A GB2321828 A GB 2321828A GB 9725989 A GB9725989 A GB 9725989A GB 9725989 A GB9725989 A GB 9725989A GB 2321828 A GB2321828 A GB 2321828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- channel
- information
- analog
- cellular system
- control channel
- 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.)
- Granted
Links
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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
An analog and CDMA cellular communication device includes an operating panel for receiving information input by a user, and a control means which can change the control channel in the analog mode of operation. The user inputs a password, which is verified, and predetermined channel usage data. The control means then selects an available channel for use as the control channel. The channel usage data may contain A and B band channel information.
Description
CHANGING CONTROL CHANNEL IN CELLULAR SYSTEM
BACKGROUND OF THE INVENTION
The present invention relates to a method of changing a control channel of a cellular system.
In general, cellular systems include control channels and voice channels, which perform a call service function of a cellular subscriber. FIG. 1 illustrates the frequency region of a cellular system. On the basis of an AMPS (advanced mobile phone service) mode EIA/TIA-553 and TR-45 analog cellular system, an A band control channel is 313 channel-333 channel, a B band control channel is 334 channel-354 channel and the remaining channels are used as voice channels. The AMPS frequency region having the construction shown in FIG. 1 uses an 800MHz band.
FIG. 2 shows an analog cellular system and CDMA (code division multiple access system) frequency region. In some countries (e.g. in Korea), the A band in the AMPS frequency region as shown in FIG. 1 is used as a common service region of the analog cellular system and the B band is used as a common service region of the CDMA, as shown in FIG. 2.
As described above, when the A band frequency is used in the analog cellular system and the B band frequency is used in the CDMA, there is no problem in the cellular service.
However, in other countries, the common frequency region as shown in FIGs. 1 and 2 may be used for other purposes (as a predetermined frequency), as shown in FIG. 3. Such a predetermined frequency may be the frequency used for military purposes or specific purposes in other radio devices. Thus, if the frequency region as shown in FIG. 3 is used as such a predetermined frequency, the AMPS cellular system or the CDMA cellular system cannot perform dual mobile service.
As indicated above, whereas the CDMA channel can be used as any region of the 800MHz band or the service frequency region, the AMPS channel can be used as the predefined control channel and voice channel. Accordingly, upon performing the dual mobile service with the analog cellular system and the CDMA system, if the predetermined frequency region overlaps with the control channel, this results in the cellular service being unable to perform. That is, it is impossible to perform the analog service when the 800MHz analog fixed frequency channel is used for other purposes.
SUMMARY OF THE INVENTION
It is an objective of the present invention to address the above problems.
Accordingly, the present invention provides an analog and
CDMA cellular system, comprising:
an operating panel for receiving key information input by a user; and
control means adapted to receive key password information, scan range information and start channel information from the operating panel, to determine whether the key password information is consistent with a predetermined key password and, if so, to analyze the start channel information and scan range information and to change the control channel of the cellular system to a channel designated by the scan range and start channel information.
Preferably, the start channel information includes A-band and B-band channel information.
The present invention also provides a method of changing a control channel in an analog and CDMA cellular system, comprising:
receiving key password information, scan range information and start channel information which are input by a user;
determining whether the key password information is consistent with a predetermined key password;
if so, analysing start channel information and the scan range information; and
changing the control channel to a channel designated by the scan range and start channel information.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 shows a frequency region of a cellular system;
FIG. 2 shows an analog cellular system and CDMA frequency region;
FIG. 3 shows a region where a predetermined frequency is used within a specific frequency band;
FIG. 4 is a chart illustrating the change of control channel according to the present invention; and
FIG. 5 shows the changed control channel.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In the present invention, the frequency region defined by
EIA/TIA-553 and TR-45 of the analog cellular system and the
CDMA system is arbitrarily changed to enhance the frequency usage efficiency. As stated above, while the CDMA can use any region of 800MHz band in the analog cellular system and the CDMA system, the AMPS has predetermined control and voice channels. As a result, after the analog control channel is changed to a frequency region other than the predetermined frequency, the analog service can be performed. Since a user can manually define the analog control channel in the cellular system, when the predetermined frequency overlaps the frequency region of the control channel, the frequency region of the control channel can be changed to perform the service.
FIG. 4 is a chart showing a change of control channel in a frequency region of a cellular system according to an embodiment of the present invention. Currently, the frequency band which the cellular system uses is 800MHz, in which the frequency of 825MHz-845MHz is used as the transmission (reception) band and the frequency of 865MHz885MHz is used as the reception (transmission) band. Also, the transmission band and the reception band are respectively divided into an A band and a B band, in which the A band corresponds to the frequency usage region of the analog cellular system and B band corresponds to the frequency usage region of the CDMA system. When the frequency region of 313 channel-360 channel in FIG. 4 is used as a predetermined frequency region, the control channel frequency region should be changed. In FIG. 4, the 0 channel-l0 channel and 360 channel-370 channel are changed into the analog control channel band.
With reference to FIG. 4, a method for changing the analog system control channel is performed by defining the relevant system parameter to as not to be the predetermined frequency but a new channel. That is, the method is executed by changing the control channel related to the software of the analog cellular system of the dual mode mobile service system. In this case, the CDMA channel and analog control channel are changed and input by inputting a defined key password via a keypad or other operating panel.
For example, the control channel of the analog system may be defined as "10", as shown in FIG. 4, and the scan range defined as "10". In changing the control channel in the analog mode of the cellular system, firstly the mobile password is input, secondly the scan range is input, thirdly the start channel information of the A band is input and finally the start channel information of the B band is input. If for example the scan range is defined as "11", the start channel information of the A band is defined as "10" and the start channel information of the B band is defined as "360", the control channel can be set by being changed to an arbitrary usage frequency region, not the predetermined frequency region as shown in FIG. 4.
Thus, 1-10 channels of the A band can be used as the control channel.
Therefore, when changing the control channel according to the present invention, the control channel can be changed as illustrated in FIG. 5. FIG. 5 shows the control channel changed in accordance with the present invention. In FIG.
5, "11" and "12" indicate the analog band and "21" and "22" indicate the analog control channel region and voice channel region defined by the user. The channel region is changed by the key password defined in the analog mode of the analog/CDMA cellular system and by changing the analog system parameter. Thus, the analog control channel region can be used as shown at "31", and one portion of "21" and "22" can be used as the analog control channel.
As is apparent from the foregoing, the present invention can solve the problem caused by the predetermined frequency and the CDMA cellular system by arbitrarily changing the control channel range which has hitherto been limited in the analog cellular system. Further, since the user can manually define the control channel of the analog mode of the analog cellular system and the CDMA cellular system, the present invention is advantageous in that a simplified process line can be made without changing the production process.
Claims (6)
1. An analog and CDMA cellular system, comprising:
an operating panel for receiving key information input by a user; and
control means adapted to receive key password information, scan range information and start channel information from the operating panel, to determine whether the key password information is consistent with a predetermined key password and, if so, to analyze the start channel information and scan range information and to change the control channel of the cellular system to a channel designated by the scan range and start channel information.
2. An analog and CDMA cellular system according to claim 1 in which the start channel information includes A-band and B-band channel information.
3. A method of changing a control channel in an analog and CDMA cellular system, comprising:
receiving key password information, scan range information and start channel information which are input by a user;
determining whether the key password information is consistent with a predetermined key password;
if so, analysing start channel information and the scan range information; and
changing the control channel to a channel designated by the scan range and start channel information.
4. A method according to claim 3 in which the start channel information includes A-band and B-band channel information.
5. An analog and CDMA cellular system substantially as described herein with reference to FIGs. 4 and 5 of the accompanying drawings.
6. A method of changing a control channel in analog and
CDMA cellular systems substantially as described herein with reference to FIGs. 4 and 5 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970003507A KR19980067465A (en) | 1997-01-31 | 1997-01-31 | How to Change Control Channel in Mobile Communication System |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9725989D0 GB9725989D0 (en) | 1998-02-04 |
| GB2321828A true GB2321828A (en) | 1998-08-05 |
| GB2321828B GB2321828B (en) | 1999-04-07 |
Family
ID=19496440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9725989A Expired - Lifetime GB2321828B (en) | 1997-01-31 | 1997-12-09 | Changing control channel in cellular system |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JP3031885B2 (en) |
| KR (1) | KR19980067465A (en) |
| CN (1) | CN1196648A (en) |
| DE (1) | DE19802836C2 (en) |
| FR (1) | FR2759221B1 (en) |
| GB (1) | GB2321828B (en) |
| RU (1) | RU2143786C1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5119397A (en) * | 1990-04-26 | 1992-06-02 | Telefonaktiebolaget L M Ericsson | Combined analog and digital cellular telephone system having a secondary set of control channels |
| US5142691A (en) * | 1991-04-05 | 1992-08-25 | Motorola, Inc. | Frequency management system |
| JPH099329A (en) * | 1995-06-16 | 1997-01-10 | Fujitsu Ltd | Channel changeover control system |
| JP2786156B2 (en) * | 1996-05-28 | 1998-08-13 | 日本電気移動通信株式会社 | PHS base station free channel search method and control device therefor |
-
1997
- 1997-01-31 KR KR1019970003507A patent/KR19980067465A/en not_active Application Discontinuation
- 1997-12-09 GB GB9725989A patent/GB2321828B/en not_active Expired - Lifetime
-
1998
- 1998-01-26 JP JP10011883A patent/JP3031885B2/en not_active Expired - Fee Related
- 1998-01-26 DE DE19802836A patent/DE19802836C2/en not_active Expired - Fee Related
- 1998-01-29 FR FR9800974A patent/FR2759221B1/en not_active Expired - Fee Related
- 1998-01-30 RU RU98102264A patent/RU2143786C1/en not_active IP Right Cessation
- 1998-01-31 CN CN98104350A patent/CN1196648A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP3031885B2 (en) | 2000-04-10 |
| FR2759221B1 (en) | 2001-06-08 |
| DE19802836C2 (en) | 2001-09-06 |
| DE19802836A1 (en) | 1998-10-01 |
| GB9725989D0 (en) | 1998-02-04 |
| CN1196648A (en) | 1998-10-21 |
| RU2143786C1 (en) | 1999-12-27 |
| GB2321828B (en) | 1999-04-07 |
| JPH1141647A (en) | 1999-02-12 |
| KR19980067465A (en) | 1998-10-15 |
| FR2759221A1 (en) | 1998-08-07 |
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