FR2759221A1 - METHOD FOR CHANGING THE CONTROL CHANNEL IN A CELLULAR SYSTEM - Google Patents

Abstract

A method of changing channels in an analog cellular system and in a CDMA cellular system is created. According to an embodiment of the present invention, the method comprises the steps of entering a key password, a scan range and a boot channel information, as well as analyzing the key password, the scan range and boot channel information when the input key password is consistent with a predetermined key password. Channels are changed according to the scan range and according to the start channel information.

Description

BACKGROUND OF THE INVENTION

  1. Field of the Invention The present invention relates to a method of

  changing channels in analog cellular systems

  code distribution multiple access (CDMA), characterized in that it includes the steps of: - entering a key password, a scanning range and start-up channel information;

  - analyze the key password, the scanning range and the

  boot channel training when the password key

  introduced is compatible with a predeter key password-

  mine; and - change the channels according to the scanning range and according to

  boot channel information.

  Thus, the present invention relates to a method

  to change the channel of a cellular system and, more particularly

  in particular, a method for changing its control channel.

  2. Description of the technique concerned

  Generally speaking, a cellular system

  takes control channels and voice channels, which e-

  perform service call functions of a cellular subscriber. Figure 1 shows the frequency spectrum

  assigned to an analog cellular system in Korea, this sys-

  teme being based on the Advanced Mobile Phone Service (STMA), EIA / ITA 533 and TR-45 mode. This system comprises two bands, namely Band A and Band B. Each band consists of 21 dedicated control channels, while the other channels are used as voice channels. Canals

  Band A and Band B control commands

  pectively on channels 313 to 333 and on channels 334 to 354.

  As illustrated in Figure 1, the STMA system uses the

800 MHz band.

  Figure 2 illustrates the frequency spectra assigned to an analog cellular system in Korea, based on the STMA, and to a digital cellular system in Korea, based on the code division multiple access system (CDMA). Referring to Figure 1, Band A corresponds to the common service area of the STMA system. To refer at

  Figure 2, Band B corresponds to the service area

with CDMA system.

  As described above with reference to Korea, the use of the frequency spectrum allocated to Band A in the analog cellular system, and the frequency spectrum

  that when assigned to Band B in the digital cellular system

  risk (CDMA), enables cellular communications

  normal. However, in another country, the areas of

  common sequences shown in Figures 1 and 2 can be

  allocated for other uses. The phrase "spectrum of

  predetermined quences "should be used below to refer to

  refer to the frequency spectrum, used in another country, which occupies the same frequency spectrum as the common frequency zones shown in Figures 1 and 2. In this case, the STMA cellular system and the CDMA cellular system cannot provide a service mobile double. The spectrum of

  preset frequencies can be used for applica-

  military and other radio devices

  frequencies with non-military application. Figure 3 is a diagram illustrating the common frequency zones of the analog cellular system and the cellular system

  CDMA, which are occupied by the predefined frequency spectrum

completed.

  While the CDMA frequency spectrum can oc-

  cut any area of the 800 MHz band, the spec-

  The STMA frequency tre is constrained by a predefined area for its control channels. As a result, a mobile service

  double cannot be provided if the predefined frequency spectrum

  finished covers the control channels of the analog system

than.

SUMMARY OF THE INVENTION

  The present invention aims to create a pro-

  assigned to change the frequency spectrum of the control channels if this spectrum is designed for other uses,

  so as to maintain cellular service.

  To this end, the present invention relates to a method for changing channels in an analog cellular system and in a CDMA cellular system, according to an embodiment of the present invention. The process

  includes the steps of entering a password

  key, scan range and channel information

  as well as analyzing the key password, scan range, and start-up channel information when the input key password is compatible with a predetermined key password. Channels are changed depending on the

  scanning range and according to the start channel information

  rage. The invention also relates to a method for changing a control channel in an analog cellular system and in a CDMA cellular system comprising two

  strips, characterized in that it comprises the stages consisting

  both to: - enter a key password, a scanning range, and

  channel information of a first band and of a

tape;

  - analyze the key password, the scanning range and the

  formation of changeable channels; - analyze the start channel information and the range of

  scan when the input key password is compatible

  ble with a predetermined key password; and - change the control channels according to the scanning range

  and according to the start channel information of the first

  first strip and the second strip.

  According to other characteristics of the invention

  tion: - key password, scanning range, first band start channel information and

  second band start channel are introduced se-

  essentially from an analog mode of a system

  analog cell phone and CDMA cell phone system.

  - the analysis step is carried out in response to the fact that a frequency spectrum of the channels is used for another

goal.

  - the analysis step is carried out in response to the fact that a frequency spectrum of the control channels is used

for another purpose.

BRIEF DESCRIPTION OF THE DRAWINGS

  The present invention will be described below in more detail with the aid of embodiments.

  shown in the accompanying drawings in which: 5 - Figure 1 is a diagram illustrating the spectrum of fre-

  quences assigned to a cellular analog system; FIG. 2 is a diagram illustrating the frequency spectra assigned to an analog cellular system and to a digital cellular system;

  FIG. 3 is a diagram illustrating the areas of fre

  common frequencies of the analog cellular system and the CDMA cellular system, which are occupied by the predetermined frequency spectrum;

  - Figure 4 is a diagram illustrating a cellular system

  laire having changed frequency spectra, in accordance with an embodiment of the present invention; and

  - Figure 5 is a diagram illustrating the com-

  changed request, according to an embodiment of the pre-

invention.

  DETAILED DESCRIPTION OF THE PREFERENTIAL EMBODIMENTS

  A preferred embodiment will be described below.

  of the present invention with reference to the accompanying drawings in which it will essentially be noted that the

  same reference numbers or letters are used

  to designate analogous or equivalent elements having the same function. In addition, we will not resume in the

  present invention the detailed description of functions and

  of known constructions unnecessarily complicating the subject of the invention.

  In one embodiment of the present invention

  tion, the frequency spectra of the analo- cellular system

  and the CDMA cell system are changed when these

  spectra are occupied by the predeter frequency spectrum-

  mine. So if the frequency spectra of the com-

  are intended for any other use, these

  spectra are moved to maintain communication

  proper cellular tion. As the cellular system num-

  While CDMA can operate in any area of the 800 MHz band, while the frequency spectrum of the analog cellular system (i.e., STMA control channels) is generally fixed, the present invention allows the user to manually define (i.e. move) the spectrum of the control channels when this

  spectrum covers the predetermined frequency spectrum.

  Figure 4 is a diagram illustrating a system

  cell teme with changed frequency spectra, se-

  lon an embodiment of the invention. In Korea, the

  cellular system commonly uses the 800 MHz band.

  The frequency spectra of 825 MHz to 845 MHz and 865 MHz to 885 MHz are used respectively for the channels

  transmission (or reception) and reception (or transmission).

  So a frequency spectrum is used for the channels

  reverse (from the mobile terminal to the fixed station), and the

  The frequency spectrum is used for the direct channels (from the fixed station to the mobile terminal). The emission and reception spectra are divided into two bands, the

  Band A and Band B, which correspond to the frequency zones

  frequency of use of the cellular system respectively

  analog (STMA) and CDMA cellular system. As repre-

  felt in Figure 4, when the predefined frequency spectrum

  finished occupies the frequency zone corresponding to the control channels 313 to 360, the spectrum of the control channels is

  changed to occupy channels 0 to 10 and 360 to 370.

  According to an embodiment of the present in-

  Note, a method of changing the control channels of the analog system is implemented by defining a system parameter, that is to say the spectrum of the control channels, to

  a spectrum other than the predetermined frequency spectrum.

  Thus, the above method is implemented by changing, by software, the channels associated with the cellular system

  analog and to the CDMA cellular system of the service system

  these dual mode mobiles. In this case, the CDMA channels and the analog control channels are changed and entered

  by entering a defined key password.

  The control channel of the analog system is defined.

  as the channel "11" as shown in Figure 4, and the scanning range as the range "11". To change the

  strip of control channels in analog system mode

  cell phone, we first introduce a mobile password. Next, the scanning range and then the start channel information of Band A are introduced. Finally, the start channel information of Band B is introduced. The scanning range corresponds to the number of channels of the two bands. The start channel information corresponds to the zones of the band which are unoccupied and which can therefore serve as changed zones. For example, the start-up channel formation of Band A designates the channel to start as soon as the frequency spectrum corresponding to Band A is

  exchange. The scanning range is defined by "11", the information

  Band A start channel information is defined by "10", and Band B start channel information is defined by "360". Thus, the control channel can be set to an arbitrary frequency area of use and not to the predetermined frequency area as shown in Figure 4. As a result, channels 1-10 of Band A can

  be used as a control channel.

  Figure 5 illustrates the changed frequency spectra of the cellular system according to an embodiment of the present invention. Referring to FIG. 5, the reference numerals 11 and 12 indicate the initial analog band (before change by the user), while the reference numerals 21 and 22 indicate the zone of analog control channels and the zone of control channels. user-defined voices. The channel area is changed by the word

  key pass defined by the analog mode of the cellular system

  analog / CDMA area, and by changing the parameters of the analog system. So, compared to the changed analog band 31, part of 21 and 22 can be used to

analog control channels.

  As appears from the above, the present invention solves the problems posed by

  the predetermined frequency spectrum, by arbitrarily changing

  the range of control channels that was limited in

  the analog cellular system. In addition, as the use

  tor can manually define the analog mode control channel of the analog cellular system and of the CDMA cellular system, it will be noted that the present invention

  maintains cellular communication without changing the pro-

  cessation of production of the cellular system.

Claims (4)

R E V E N D I C A T IONS   1) Method for changing channels in a cellular system   analog area and in a CDMA cellular system, characterized in that it comprises the steps consisting in: - entering a key password, a scanning range and start-up channel information;   - analyze the key password, the scanning range and the   boot channel training when the password key   introduced is compatible with a predeter key password-   mine; and - change the channels according to the scanning range and according to   boot channel information.   2) Method for changing a control channel in an analog cellular system and in a CDMA cellular system comprising two bands, characterized in that it comprises the steps consisting in: entering a key password, a scanning range , and   channel information of a first band and of a tape;   - analyze the key password, the scanning range and the   formation of changeable channels; - analyze the start channel information and the range of   scan when the input key password is compatible   ble with a predetermined key password; and - change the control channels according to the scanning range   and according to the start channel information of the first   first strip and the second strip.   3) Method according to claim 2, characterized in that the key password, the scanning range, the start channel information of the first band and the information of   second band start channel are introduced se-   essentially from an analog mode of a system   analog cell phone and CDMA cell phone system.   4) Method according to claim A, characterized in that   the analysis step is performed in response to the fact that a frequency spectrum of the channels is used for another purpose.    ) Method according to claim 2, characterized in that the analysis step is carried out in response to the fact that a   frequency spectrum of the control channels is used for another purpose.