APPARATUS AND METHOD FOR TRANSMITTING A CONTROL CHANNEL MESSAGE IN A MOBILE COMMUNICATION SYSTEM

• US 20080080421A1
• Filed: 09/11/2007
• Published: 04/03/2008
• Est. Priority Date: 09/11/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KWON, Hwan-Joon, YU, Jae-Chon, KIM, Dong-Hee, HAN, Jin-Kyu, LIM, Yeon-Ju
• Granted Patent: US 7,839,823 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

Disclosed is an apparatus and a method for transmitting a control channel message, which can reduce resource waste in an OFDM system multiplexing and using a Block Resource Channel (BRCH) and a Distributed Resource Channel (DRCH) in a frequency axis. The apparatus includes a controller for generating a predetermined field and outputting a control channel message including the predetermined field, the predetermined field indicating a precoding index when a common pilot is used for data demodulation in a mobile station and indicating a pilot format of a dedicated pilot when the dedicated pilot is used for data demodulation in the mobile station, the precoding index indicating a weight value for beam-forming of each antenna; and a transmission module for converting the control channel message into a wireless signal and transmitting the wireless signal to the mobile station. The apparatus and method can reduce the resource waste of a control channel by inserting different pieces of information into a predetermined field included in the control channel message according to the channel type and the multiplexing mode of a resource channel in an Orthogonal Frequency Division Multiplexing (OFDM) system, and enables the efficient use of resources by transmitting different types of control information through redundant bits of a control channel message.

Claims

1. An apparatus for transmitting a control channel message in a mobile communication system, the apparatus comprising:

a controller for generating a predetermined field and outputting a control channel message including the predetermined field, the predetermined field indicating a precoding index when a common pilot is used for data demodulation in a mobile station and indicating a pilot format of a dedicated pilot when the dedicated pilot is used for data demodulation in the mobile station, the precoding index indicating a weight value for beam-forming of each antenna; and

a transmission module for converting the control channel message into a wireless signal and transmitting the wireless signal to the mobile station.

2. The apparatus as claimed in claim 1, wherein the controller determines that:

the common pilot is used in entire frequency resources in a case of a first multiplexing mode of a resource channel in which resources to be allocated to a Distributed Resource Channel (DRCH) are appointed from among the entire frequency resources and resources to be allocated to a Block Resource Channel (BRCH) are then appointed from among remaining frequency resources; and

the common pilot is used for the resources to be allocated to the DRCH in a second multiplexing mode of the resource channel in which the entire frequency resources are divided into a DRCH sub-band for the DRCH and a BRCH sub-band for the BRCH.

3. The apparatus as claimed in claim 2, wherein the controller further determines that the dedicated pilot is used for the resources to be allocated to the BRCH in the second multiplexing mode in which the entire frequency resources are divided into the DRCH sub-band for the DRCH and the BRCH sub-band for the BRCH.

4. The apparatus as claimed in claim 3, wherein the controller uses multiplexing mode information included in system information broadcasted by a system in order to determine if it is the first multiplexing mode or the second multiplexing mode.

5. The apparatus as claimed in claim 4, wherein the controller uses channel type information according to resources of a data channel allocated to the mobile station in order to determine if the data channel is the DRCH or the BRCH.

6. The apparatus as claimed in claim 1, wherein the predetermined field comprises two bits indicating a pilot format determined for the mobile station from among a plurality of predetermined pilot formats when the dedicated pilot is used.

7. A method for transmitting a control channel message in a mobile communication system, the method comprising the steps of:

generating a predetermined field that indicates a preceding index when a common pilot is used for data demodulation in a mobile station and indicates a pilot format of a dedicated pilot when the dedicated pilot is used for data demodulation in the mobile station, the preceding index indicating a weight value for beam-forming of each antenna;

outputting a control channel message including the predetermined field; and

converting the control channel message into a wireless signal and transmitting the wireless signal to the mobile station.

8. The method as claimed in claim 7, further comprising:

determining that the common pilot is used in entire frequency resources, in a first multiplexing mode of a resource channel in which resources to be allocated to a Distributed Resource Channel (DRCH) are appointed from among the entire frequency resources and resources to be allocated to a Block Resource Channel (BRCH) are then appointed from among remaining frequency resources; and

determining that the common pilot is used for the resources to be allocated to the DRCH, in a second multiplexing mode of the resource channel in which the entire frequency resources are divided into a DRCH sub-band for the DRCH and a BRCH sub-band for the BRCH.

9. The method as claimed in claim 8, further comprising determining that the dedicated pilot is used for the resources to be allocated to the BRCH in the second multiplexing mode in which the entire frequency resources are divided into the DRCH sub-band for the DRCH and the BRCH sub-band for the BRCH.

10. The method as claimed in claim 9, further comprising acquiring multiplexing mode information included in system information broadcasted by a system in order to determine if it is the first multiplexing mode or the second multiplexing mode.

11. The method as claimed in claim 10, further comprising acquiring channel type information according to resources of a data channel allocated to the mobile station in order to determine if the data channel is the DRCH or the BRCH.

12. The method as claimed in claim 7, wherein the predetermined field comprises two bits indicating a pilot format determined for the mobile station from among a plurality of predetermined pilot formats when the dedicated pilot is used.

13. An apparatus for receiving a control channel message in a mobile communication system, the apparatus comprising:

a reception module for receiving a control channel message through a control channel; and

a controller for extracting a predetermined field from the control channel message and analyzing the predetermined field according to if a common pilot or a dedicated pilot is used for data demodulation in a mobile station, the predetermined field indicating a precoding index when the common pilot is used and indicating a pilot format of the dedicated pilot when the dedicated pilot is used, the precoding index indicating a weight value for beam-forming of each antenna.

14. The apparatus as claimed in claim 13, wherein the controller determines that:

the common pilot is used in entire frequency resources in a case of a first multiplexing mode of a resource channel in which resources to be allocated to a Distributed Resource Channel (DRCH) are appointed from among the entire frequency resources and resources to be allocated to a Block Resource Channel (BRCH) are then appointed from among remaining frequency resources; and

the common pilot is used for the resources to be allocated to the DRCH in a second multiplexing mode of the resource channel in which the entire frequency resources are divided into a DRCH sub-band for the DRCH and a BRCH sub-band for the BRCH.

15. The apparatus as claimed in claim 14, wherein the controller further determines that the dedicated pilot is used for the resources to be allocated to the BRCH in the second multiplexing mode in which the entire frequency resources are divided into the DRCH sub-band for the DRCH and the BRCH sub-band for the BRCH.

16. The apparatus as claimed in claim 15, wherein the controller uses multiplexing mode information included in system information broadcasted by a system in order to determine if it is the first multiplexing mode or the second multiplexing mode.

17. The apparatus as claimed in claim 16, wherein the controller uses channel type information according to resources of a data channel allocated to the mobile station in order to determine if the data channel is the DRCH or the BRCH.

18. The apparatus as claimed in claim 13, wherein the predetermined field comprises two bits indicating a pilot format determined for the mobile station from among a plurality of predetermined pilot formats when the dedicated pilot is used.

19. A method for receiving a control channel message in a mobile communication system, the method comprising the steps of:

receiving a control channel message through a control channel;

extracting a predetermined field from the control channel message, the predetermined field indicating a preceding index when a common pilot is used for data demodulation in a mobile station and indicating a pilot format of a dedicated pilot when the dedicated pilot is used for data demodulation in the mobile station, the precoding index indicating a weight value for beam-forming of each antenna; and

analyzing the predetermined field according to if the common pilot or the dedicated pilot is used for data demodulation in the mobile station.

20. The method as claimed in claim 19, further comprising:

determining that the common pilot is used in entire frequency resources, in a first multiplexing mode of a resource channel in which resources to be allocated to a Distributed Resource Channel (DRCH) are appointed from among the entire frequency resources and resources to be allocated to a Block Resource Channel (BRCH) are then appointed from among remaining frequency resources; and

determining that the common pilot is used for the resources to be allocated to the DRCH, in a second multiplexing mode of the resource channel in which the entire frequency resources are divided into a DRCH sub-band for the DRCH and a BRCH sub-band for the BRCH.

21. The method as claimed in claim 20, further comprising determining that the dedicated pilot is used for the resources to be allocated to the BRCH in the second multiplexing mode in which the entire frequency resources are divided into the DRCH sub-band for the DRCH and the BRCH sub-band for the BRCH.

22. The method as claimed in claim 21, further comprising acquiring multiplexing mode information included in system information broadcasted by a system in order to determine if it is the first multiplexing mode or the second multiplexing mode.

23. The method as claimed in claim 22, further comprising acquiring channel type information according to resources of a data channel allocated to the mobile station in order to determine if the data channel is the DRCH or the BRCH.

24. The method as claimed in claim 19, wherein the predetermined field comprises two bits indicating a pilot format determined for the mobile station from among a plurality of predetermined pilot formats when the dedicated pilot is used.