GB2302632A - A Method of Entering a Service State in a Weak Field - Google Patents
A Method of Entering a Service State in a Weak Field Download PDFInfo
- Publication number
- GB2302632A GB2302632A GB9612641A GB9612641A GB2302632A GB 2302632 A GB2302632 A GB 2302632A GB 9612641 A GB9612641 A GB 9612641A GB 9612641 A GB9612641 A GB 9612641A GB 2302632 A GB2302632 A GB 2302632A
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- United Kingdom
- Prior art keywords
- channel
- received
- detecting whether
- currently tuned
- data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Abstract
A method is described for entering a service state by optimum channel scanning in a weak electro field where radio wave interference is strong. It is of particular application to cellular mobile communication terminal equipment. At least two strongest paging channel signals are sequentially selected in the ETACS-type cellular phone system. The method detects whether a particular kind of data is received on the currently tuned channel and, if so, whether an overhead message train is received on the currently tuned channel and, if so, enters an idle state. Otherwise, tuning the next selected paging channel and returning to step c., until the selected paging channels are exhausted. In this way, the overhead message train is completely received within a set time, thus allowing transmission and reception in a weak electro field of a received channel. Therefore, the successful paging rate is increased and errors of tranceived data are recuded.
Description
A METHOD OF ENTERING A SERVICE STATE IN A WEAK ELECTRO
FIELD WITH STRONG RADIO WAVE INTERFERENCE
The present invention relates to a channel scanning method for cellular mobile communication terminal equipment, and more particularly, to a method for entering a service state suitable for use in a weak electro field where radio interference is strong.
In general, the channels of a cellular system are divided into control channels and voice channels. Extended total access communication system (ETACS) has designated an optimum channel searching method as a cellular mobile communication standard. That is to say, channels 23 through 43 belong to a band A and channels 323 through 343 belong to a band B, each having 21 control channels. In the abovementioned standard, the total number of channels is 1320 and communication channels are assigned according to the respective locations except control channels. Therefore, when using band A, 21 channels are scanned to search for two optimum channels and to receive data from a base station.
In order for a mobile station to communicate, first, the mobile station transmits and receives necessary data via a control channel. For this purpose, the mobile station measures receive levels of 21 control channels for bands A and B given by the cellular system and then selects the two optimum channels by their receive levels. Of these two channels, if data is not received from the stronger channel, the next strongest channel is tuned to detect the data. Then, when protocol data is transceived between base station and mobile station, it is best that the data is transceived via the optimum control signal in receive signal strength.
FIG. 1 is a general block diagram of a general cellular terminal equipment in a cellular mobile communication system, which includes a microprocessor 10, an antenna 12, a duplexer 14, an RF/IF unit 16, a frequency synthesizer 18, an RAM 20 and an EPROM 22.
In FIG. 1, the duplexer 14 protects a receiver from a transmitted output during transmission and supplies the receiver with an echo signal during reception. The RF/IF unit 16, including a transmitter, a receiver and an interface outputs the received data to a microprocessor 10 and the data transmitted from the microprocessor 10 to the duplexer 14. The microprocessor 10 controls the overall system and processes data to output transmitted data to a transmission port Tx and receive received data through a reception port Rx, and receives the receive signal strength for a predetermined channel through a receive signal strength indicating port (RSSI). Also, channel control signals CHCONT are exchanged for scanning a predetermined channel, e.g., channel data, a data strobe signal or a clock signal, to a frequency synthesizer 18.The frequency synthesizer 18 controls the RF side of RF/IF unit 16 to lock a predetermined channel for transmission and reception in response to the channel control signals.
FIG. 2 is a controlling flow chart showing a conventional channel scanning method.
Referring to FIGS. l and 2, the conventional channel scanning method will now be described. In step 101, the microprocessor 10 detects whether a serving system state is enabled or not. If enabled, the process proceeds to step 102 to select the two strongest channels in system A.
However, if the serving system state is disabled, the microprocessor 10 selects the two strongest channels in a system B in a step 103.
Then, in step 104, the microprocessor 10 tunes the first strongest channel and then proceeds to step 105. In step 105, the microprocessor 10 drives a 3.75 second timer and then proceeds to step 106. In step 106, the microprocessor 10 detects whether an overhead message train is received or not. If not received, the process proceeds to step 107. In the 107, the microprocessor 10 detects whether the time set by the 3.75 second timer has elapsed or not. If not elapsed, the process returns to step 107. If elapsed, the process proceeds to step 108.
In step 108, the microprocessor 10 detects whether the second strongest channel is tuned or not. If not tuned, the process proceeds to step 109 to tune the second strongest channel and then proceeds to step 110. In step 110, the microprocessor 10 detects whether an inter-system roaming inhibit option is enabled or not. If not enabled, the process proceeds to step 111. In step 111, the microprocessor 10 detects whether the serving system state is responsive to a non-selected system or not. If yes, the service is executed by the system selected in step 113 and then the process returns to the initial step. However, if not, the process proceeds to step 112 to perform the service by the non-selected system.
If the overhead message train is received in step 106, the process proceeds to step 113, and then the microprocessor 10 detects whether a serving system state is enabled or not. If enabled, the process proceeds to step 115 to select the two strongest channels in system A. However, if the serving system state is disabled, the microprocessor 10 selects the two strongest channels in system B in step 114.
Then, in step 116, the microprocessor 10 tunes the first strongest channel and then proceeds to step 117.
In step 117, the microprocessor 10 drives a 3.75 second timer and then proceeds to step 118. In step 118, the microprocessor 10 detects whether an overhead message train is received or not. If received, the process proceeds to an idle state. However, if not, in step 119, the microprocessor 10 detects whether the time set by the 3.75 second timer has elapsed or not. If not elapsed, the process returns to step 118. If elapsed, the process proceeds to step 120.
In step 120, the microprocessor 10 detects whether the second strongest channel is tuned or not. If not tuned, the process proceeds to step 121 to tune the second strongest channel and then returns to step 117. If tuned, the process proceeds to step 122. In step 122, the microprocessor 10 detects whether an inter-system roaming inhibit option is enabled or not. If not enabled, the process proceeds to step 123. In step 123, the microprocessor 10 detects whether the serving system state is responsive to a nonselected system or not. If yes, the service is executed by the system selected in step 125 and then the process returns to the initial step. However, if not, the process proceeds to step 124 to perform the service by the nonselected system.
However, as described above, in the ETACS mobile phone service, supposing that the optimum channel searching method is implemented with the ETACS mobile station specification 2.6.1.1.1 scan dedicated control channels and 2.6.1.2.1 scan paging channels in the cellular mobile communication standard, if there is any RF signal stronger than the 2.6.1.1.1 scan dedicated control channels or 2.6.1.2.1 scan paging channels of a base station in at least two channels, the ETACS mobile station cannot enter the service state.
Therefore, it is an object of the present invention to provide a method of entering a service state by scanning for an optimum channel in a weak electro field where radio wave interference is strong.
The service executing method of the present invention comprises:
a. selecting N paging channel signals in order of signal strength from a system of the said cellular terminal equipment;
b. tuning a first selected paging channel;
c. detecting whether a particular kind of data is received on the currently tuned channel and, if so, detecting whether an overhead message train is received on the currently tuned channel and, if so, entering an idle state;
d. otherwise, tuning the next selected paging channel and returning to step c., until the selected paging channels are exhausted.
Preferably, the method comprises:
e. selecting N paging channel signals in order of signal strength from a system of the said cellular terminal equipment;
f. tuning a first selected paging channel;
g. detecting whether a particular kind of data is received on the currently tuned channel and, if so, detecting whether an overhead message train is received on the currently tuned channel and, if so, proceeding to step a.;
h. otherwise, tuning the next selected paging channel and returning to step g., until the selected paging channels are exhausted.
Step d. and/or step h. may include:
i. detecting whether an inter-system roaming inhibit option is enabled and, if so, returning to step e.
Step d. and/or step h. may further include:
j. detecting whether the serving system state is responsive to a non-selected system and:
k. if so, executing service by a selected system if the said serving system state is responsive to a nonselected system;
1. otherwise, executing service by a non-selected system.
Detecting whether a particular kind of data is received on the currently tuned channel may be done by:
m. driving a timer of a first duration and detecting whether the particular kind of data is received from the currently tuned channel before the timer expires.
Detecting whether an overhead message train is received on the currently tuned channel may be done by:
n. driving a timer of a second duration and detecting whether the overhead message train is received from the currently tuned channel before the timer expires.
Preferably, the second duration is longer than the first duration by a factor of 3.75. The first duration may be 400 msec. (and the second 1500 msec.)
The number of channels selected, N, may be 5.
The above objects and advantages of the present invention will become more apparent from the following detailed description of a preferred embodiment with reference to the attached drawings in which:
FIG. 1 is a block diagram of a general cellular terminal equipment in a cellular mobile communication system;
FIG. 2 is a controlling flow chart showing a conventional optimum channel scanning method; and
FIG. 3 is a controlling flow chart for receiving the service of a base station in a weak electro field where interference radio wave is strong, according to the present invention.
The hardware block diagram according to the present invention is the same as shown in FIG. 1, and the same reference numerals are used.
Referring to FIG. 3, since transmission and reception are allowed when a given control channel is scanned by a mobile station and data is tuned with a strong channel in transmitting and receiving the data, it is important for the mobile station to select a channel depending on its movement. The flow chart for a paging process for the mobile station receiving the service of the base station in a weak electro field where radio wave interference is strong is shown in FIG. 3, for which the operation will now be described.
In step 201, the microprocessor 10 detects whether a serving system state is enabled or not. If enabled, the process proceeds to step 202 to sequentially select the N strongest channels in system A. However, if the serving system state is disabled, the microprocessor 10 sequentially selects the N strongest channels in system B in step 203. Then, in step 204, the microprocessor 10 tunes the first strongest channel among N channels and then proceeds to step 205.
In step 205, the microprocessor 10 drives an X second timer and then proceeds to step 206. Here, the X second timer is set to 400 msec. In the step 206, the microprocessor 10 detects whether a kind of data is received from the currently tuned channel or not. If yes, the process proceeds to step 207. In step 207, the microprocessor 10 drives a 3.75-X second timer and then proceeds to step 208.
In step 208, the microprocessor 10 detects whether an overhead message train is received or not. If not received, the process proceeds to step 209. In step 209, the microprocessor 10 detects whether the time set by the 3.75-X second timer has elapsed or not. If not elapsed, the process returns to step 208. If elapsed, the process proceeds to step 211.
However, if the one kind of data is not received from the currently tuned channel in step 206, the process proceeds to step 210 to detect whether the time set by the X second timer has elapsed or not. If not, the process returns to step 206. If yes, the process proceeds to step 211. In step 211, the microprocessor detects whether the tuning of N channels is completed or not. If not, the process proceeds to step 212 to tune the next channel and then returns to step 205. However, if the tuning is completed in step 211, the process proceeds to step 213 and the microprocessor 10 detects whether an inter-system roaming inhibit option is enabled or not. If not enabled, the process proceeds to step 214. In step 214, the microprocessor 10 detects whether the serving system state is responsive to a nonselected system or not.If yes, the service is executed by the system selected in step 216 and then the process returns to the initial step. However, if not, the process proceeds to step 112 to perform the service by the nonselected system.
If the overhead message train is received in step 208, in step 217, the microprocessor 10 detects whether a serving system state is enabled or not. If enabled, the process proceeds to step 218 to sequentially select the N strongest channels in system A. However, if the serving system state is disabled, the microprocessor 10 sequentially selects the
N strongest channels in system A in step 217. Then, in step 220, the microprocessor 10 tunes the first strongest channel among N channels and then proceeds to step 221.
In step 221, the microprocessor 10 drives an X second timer and then proceeds to step 222. In step 222, the microprocessor 10 detects whether a kind of data is received from the currently tuned channel or not. If yes, the process proceeds to step 223. In step 223, the microprocessor 10 drives a 3.75-X second timer and then proceeds to step 224. In step 224, the microprocessor 10 detects whether an overhead message train is received or not. If yes, the process proceeds to an idle state. If not received, the process proceeds to step 225. In step 225, the microprocessor 10 detects whether the time set by the 3.75-X second timer has elapsed or not. If not elapsed, the process returns to step 224. If elapsed, the process proceeds to step 217.
However, if the one kind of data is not received from the currently tuned channel in the step 222, the process proceeds to step 226 to detect whether the time set by the
X second timer has elapsed or not. If not, the process returns to step 222. If yes, the process proceeds to step 227. In step 227, the microprocessor detects whether the tuning of N channels is completed or not. If not, the process proceeds to step 228 to tune the next channel and then returns to step 221. However, if the tuning is completed in step 211, the process proceeds to step 229 and the microprocessor 10 detects whether an inter-system roaming inhibit option is enabled or not. If not enabled, the process proceeds to step 230. In step 230, the microprocessor 10 detects whether the serving system state is responsive to a non-selected system or not. If yes, the service is executed by the system selected in step 232 and then the process returns to the initial step. However, if not, the process proceeds to step 231 to perform the service by the non-selected system.
As described above, according to the present invention, at least two strongest paging channel signals are sequentially selected in the ETACS-type cellular phone system to then be tuned sequentially so that an overhead message train is completely received within a set time, thereby allowing transmission and reception at a weak electro field of a received channel by interference radio wave. Therefore, the successful paging rate is increased and errors of tranceived data are prevented by a fading phenomenon.
Claims (10)
1. A service executing method for cellular terminal equipment, comprising:
a. selecting N paging channel signals in order of signal strength from a system of the said cellular terminal equipment;
b. tuning a first selected paging channel;
c. detecting whether a particular kind of data is received on the currently tuned channel and, if so, detecting whether an overhead message train is received on the currently tuned channel and, if so, entering an idle state;
d. otherwise, tuning the next selected paging channel and returning to step c., until the selected paging channels are exhausted.
2. A service executing method according to claim 1, comprising:
e. selecting N paging channel signals in order of signal strength from a system of the said cellular terminal equipment;
f. tuning a first selected paging channel;
g. detecting whether a particular kind of data is received on the currently tuned channel and, if so, detecting whether an overhead message train is received on the currently tuned channel and, if so, proceeding to step a.;
h. otherwise, tuning the next selected paging channel and returning to step g., until the selected paging channels are exhausted.
3. A service executing method according to claim 2 in which step d. and/or step h. includes:
i. detecting whether an inter-system roaming inhibit option is enabled and, if so, returning to step e.
4. A service executing method according to claim 2 or claim 3 in which step d. and/or step h. includes:
j. detecting whether the serving system state is responsive to a non-selected system and:
k. if so, executing service by a selected system if the said serving system state is responsive to a nonselected system;
1. otherwise, executing service by a non-selected system.
5. A service executing method according to any preceding claim in which detecting whether a particular kind of data is received on the currently tuned channel includes:
m. driving a timer of a first duration and detecting whether the particular kind of data is received from the currently tuned channel before the timer expires.
6. A service executing method according to claim 5 in which detecting whether an overhead message train is received on the currently tuned channel includes:
n. driving a timer of a second duration and detecting whether the overhead message train is received from the currently tuned channel before the timer expires.
7. A service executing method according to claim 6 in which the second duration is longer than the first duration by a factor of 3.75.
8. A service executing method according to any one of claims 5-7 in which the first duration is 400 msec.
9. A service executing method according to any preceding claim in which N is 5.
10. A service executing method for cellular terminal equipment substantially as described herein with reference to FIG. 3 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950017356A KR0143316B1 (en) | 1995-06-24 | 1995-06-24 | Service processing method for strong interference microwave in cellular phone |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9612641D0 GB9612641D0 (en) | 1996-08-21 |
| GB2302632A true GB2302632A (en) | 1997-01-22 |
| GB2302632B GB2302632B (en) | 1998-06-10 |
Family
ID=19418223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9612641A Expired - Fee Related GB2302632B (en) | 1995-06-24 | 1996-06-17 | A method of entering a service state in a weak electro field with strong radio wave interference |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR0143316B1 (en) |
| GB (1) | GB2302632B (en) |
| IT (1) | IT1285206B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000065358A (en) * | 1999-04-02 | 2000-11-15 | 김영환 | Overhead message transmission method of paging channel using the Random function in the mobile communication system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5524278A (en) * | 1992-02-06 | 1996-06-04 | Motorola, Inc. | Method and apparatus for determining a serving communication system where communication systems operate conjunctively |
| US5517673A (en) * | 1994-09-20 | 1996-05-14 | Ericsson Inc. | Systems and methods for cellular radiotelephone system access without system identification comparison |
-
1995
- 1995-06-24 KR KR1019950017356A patent/KR0143316B1/en not_active IP Right Cessation
-
1996
- 1996-06-13 IT IT96MI001210A patent/IT1285206B1/en active IP Right Grant
- 1996-06-17 GB GB9612641A patent/GB2302632B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI961210A0 (en) | 1996-06-13 |
| ITMI961210A1 (en) | 1997-12-13 |
| KR0143316B1 (en) | 1998-08-17 |
| KR970004934A (en) | 1997-01-29 |
| IT1285206B1 (en) | 1998-06-03 |
| GB2302632B (en) | 1998-06-10 |
| GB9612641D0 (en) | 1996-08-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20080617 |