Cell selecting system and method thereof in radio communication network

• US 20040203452A1
• Filed: 04/18/2003
• Published: 10/14/2004
• Est. Priority Date: 05/17/2002
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jin-Hoon
• Granted Patent: US 7,171,201 B2
• Time in Patent Office: Days
• US Class Current: 455/67.11
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/20 Selecting an access point

Abstract

In a cell selecting system and a method thereof in a radio communication network, a forward BCCH is constructed to contain, in each time slot of a frame, both a FCCH bit pattern and a SCH bit pattern. The method includes measuring the reception power of a forward BCCH transmitted from each cell, while detecting a FCCH bit pattern and a SCH bit pattern from a time slot of the forward BCCH and demodulating the detected bit patterns. The cell synchronization can be performed by using the demodulated information of the selected cell. Accordingly, the cell selection time and the processing load of the mobile terminal can be reduced.

Claims

1. A cell selecting system in a radio communication network, the system comprising:

at least one device which broadcasts a forward broadcast control channel (BCCH); and

a mobile terminal which measures a reception power level of the forward BCCH and demodulates certain data bit patterns contained in the forward BCCH, simultaneously, so as to select an appropriate cell.

2. The system of claim 1, wherein the mobile terminal accesses any one of time slots of a pertinent frame of the forward BCCH to demodulate the certain data bit patterns, each time slot of the pertinent frame of the forward BCCH including both a frequency correction channel (FCCH) bit pattern and a synchronization channel (SCH) bit pattern therein.

3. The system of claim 1, wherein the device is a base station in the radio communication network.

4. A mobile terminal which receives a forward broadcast control channel (BCCH) from at least one cell, and measures a reception power level of the forward BCCH while demodulating certain data bit patterns contained in the forward BCCH, so as to select an appropriate cell.

5. The mobile terminal of claim 4, wherein the mobile terminal accesses any one of time slots of a pertinent frame of the forward BCCH to demodulate the certain data bit patterns, each time slot of the pertinent frame of the forward BCCH including both a frequency correction channel (FCCH) bit pattern and a synchronization channel (SCH) bit pattern therein.

6. A forward channel demodulation method of a cell selecting system in a radio communication network, the method comprising:

monitoring a forward channel; and

measuring a reception power level of the forward channel and demodulating certain bit patterns contained in the forward channel, simultaneously.

7. The method of claim 6, wherein, in the monitoring step, each time slot of a frame of the forward channel includes the certain bit patterns.

8. The method of claim 6, wherein, in the monitoring step, the forward channel is a forward broadcast control channel (BCCH), and the certain bit patterns include a frequency correction channel (FCCH) bit pattern and a synchronization channel (SCH) bit pattern.

9. A cell selecting method usable in a radio communication network, the method comprising:

receiving a forward channel from each cell;

measuring a reception power of the received forward channel while accessing and demodulating data bits from the forward channel of a pertinent cell; and

selecting a cell having the greatest power reception based on the measured reception power and performing a cell synchronization with the selected cell on the basis of the demodulated data bits.

10. The method of claim 9, wherein the forward channel includes a forward broadcast control channel (BCCH), and the data bits include a frequency correction channel (FCCH) bit pattern and a synchronization channel (SCH) bit pattern.

11. The method of claim 10, wherein each time slot of a frame of the forward BCCH contains therein the FCCH bit pattern and the SCH bit pattern.

12. The method of claim 9, wherein the accessing and demodulating step comprises:

detecting a frequency correction channel (FCCH) bit pattern and a synchronization channel (SCH) bit pattern from the forward channel and storing the detected bit patterns; and

demodulating the stored SCCH bit pattern and SCH bit pattern separately.

13. The method of claim 12, wherein the detecting step includes accessing any one time slot of a certain frame of the forward channel to detect the FCCH bit pattern and the SCH bit pattern.

14. A method of obtaining at least one of a frequency correction channel (FCCH) bit pattern and a synchronization channel (SCH) bit pattern from a control channel, the method comprising:

accessing any one of time slots of a certain frame of the control channel and thereby obtaining said at least one of the FCCH and SCH bit patterns.

15. The method of claim 14, wherein both the FCCH and SCH bit patterns are obtained by accessing any one of the time slots.

16. A forward channel usable in a radio communication network, comprising at least one frame having a plurality of time slots per frame, each of the time slots having therein both a frequency correction channel (FCCH) bit pattern and a synchronization channel (SCH) bit pattern.

17. The forward channel of claim 16, wherein the forward channel is a forward broadcast control channel (BCCH).

18. The forward channel of claim 16, wherein each frame includes 8 time slots.