MULTI-CARRIER TRANSMITTING APPARATUS AND METHOD FOR MULTICAST SERVICE

• US 20130286923A1
• Filed: 09/06/2012
• Published: 10/31/2013
• Est. Priority Date: 04/25/2012
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: CHUN, Sun-Sim, KIM, Young-Il, PARK, Dae-Geun, RYU, Won, KIM, Han-Nah
• Granted Patent: US 8,953,512 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals

Abstract

Provided are an apparatus and method for transmitting multi-carriers to provide a high-quality service to multicast-based service subscriber terminals. The method includes: mapping first data for providing the multicast service, and second data different from the first data, to s different antennas; converting the first mapped data into a first Intermediate Frequency (IF) signal and the second mapped data into a second IF signal; converting the first IF signal into a first RF signal having a carrier frequency, and deciding a power intensity of the first RF signal so that the first RF signal is transmitted over the entire coverage region of the base station; and converting the second IF signal into a second RF signal having the other carrier frequency, and to deciding a power intensity of the second RF signal so that the second RF signal is transmitted over a predetermined region around the base station.

Claims

1. A multi-carrier transmitting apparatus for providing a multicast service in a base station using a multi-input and multi-output (MIMO) scheme, comprising:

a mapping unit configured to map first data for providing the multicast service, and second data different from the first data, to first and second antennas, respectively;

a Radio Frequency (RF) processor configured to convert the first data mapped to the first antenna into a first transmission-band RF signal of a carrier corresponding to the first data, and the second data mapped to the second antennas into a second transmission-band RF signal of a carrier corresponding to the second data, respectively; and

an antenna mapping unit configured to transmit the first transmission-band RF signal through the first antenna, and the second transmission-band RF signal through the second antenna, respectively.

2. The multi-carrier transmitting apparatus of claim 1, wherein the RF processor comprises:

first and second Intermediate Frequency (IF) converters configured to convert the first data and the second data into a first IF signal and a second IF signal, respectively;

a first RF converter configured to convert the first IF signal into a first RF signal having a carrier frequency among two carrier frequencies adjacent to each other, and to decide a power intensity of the first RF signal so that the first RF signal is transmitted over the entire coverage region of the base station; and

a second RF converter configured to convert the second IF signal into a second RF signal having the other carrier frequency among the carrier frequencies adjacent to each other, and to decide a power intensity of the second RF signal so that the second RF signal is transmitted over a predetermined region around the base station, wherein the power intensity of the second RF signal is set to be lower than a predetermined threshold intensity.

3. The multi-carrier transmitting apparatus of claim 1, wherein the RF processor comprises:

first and second Intermediate Frequency (IF) converter configured to convert the first data and the second data into a first IF signal and a second IF signal, respectively;

a first RF converter configured to convert the first IF signal into a first RF signal having a lower carrier frequency among two carrier frequencies not adjacent to each other; and

a second RF converter configured to convert the second IF signal into a second RF signal having a higher carrier frequency among the carrier frequencies not adjacent to each other.

4. The multi-carrier transmitting apparatus of claim 1, wherein the second data is additional data of the first data.

5. The multi-carrier transmitting apparatus of claim 1, wherein the second data is a unicast signal.

6. A multi-carrier transmitting apparatus for providing a multicast service in a base station using a multi-input and multi-output (MIMO) scheme, comprising:

a MIMO encoding unit configured to multiply first data for providing the multicast service, and second data different from the first data by first and second weights according to a MIMO scheme, respectively, thereby encoding the first data and the second data to first encoded data and second encoded data, respectively;

a mapping unit configured to logically map the first encoded data and the second encoded data to first and second antennas that are to transmit the first encoded data and the second encoded data, respectively, thereby generating a first mapped signal and a second mapped signal;

an Radio Frequency (RF) processing unit configured to convert the first mapped signal into a first transmission-band RF signal of a carrier corresponding to the first mapped signal, and the second mapped signal into a second transmission-band RF signal of a carrier corresponding to the second mapped signal, respectively; and

an antenna unit configured to transmit the first transmission-band RF signal through the first antenna and the second transmission-band RF signal through the second antenna.

7. The multi-carrier transmitting apparatus of claim 6, wherein the RF processor comprises:

first and second Intermediate Frequency (IF) converters configured to convert the first data and the second data into a first IF signal and a second IF signal, respectively;

a first RF converter configured to convert the first IF signal into a first RF signal having a carrier frequency among two carrier frequencies adjacent to each other, and to decide a power intensity of the first RF signal so that the first RF signal is transmitted over the entire coverage region of the base station; and

a second RF converter configured to convert the second IF signal into a second RF signal having the other carrier frequency among the carrier frequencies adjacent to each other, and to decide a power intensity of the second RF signal so that the second RF signal is transmitted over a predetermined region around the base station, wherein the power intensity of the second RF signal is set to be lower than a predetermined threshold intensity.

8. The multi-carrier transmitting apparatus of claim 6, wherein the RF processing unit comprises:

first and second Intermediate Frequency (1F) converter configured to convert the first data and the second data into a first IF signal and a second IF signal, respectively;

a first RF converter configured to convert the first IF signal into a first RF signal having a lower carrier frequency among two carrier frequencies not adjacent to each other; and

a second RF converter configured to convert the second IF signal into a second RF signal having a higher carrier frequency among the carrier frequencies not adjacent to each other.

9. The multi-carrier transmitting apparatus of claim 6, wherein the second data is additional data of the first data.

10. The multi-carrier transmitting apparatus of claim 6, wherein the second data is a unicast signal.

11. A method for transmitting multi-carriers to provide a multicast service in a base station using a multi-input and multi-output (MIMO) scheme, comprising

mapping first data for providing the multicast service, and second data different from the first data, to different antennas, respectively, thereby generating first mapped data and second mapped data;

converting the first mapped data into a first Intermediate Frequency (IF) signal and the second mapped data into a second IF signal, respectively;

converting the first IF signal into a first RF signal having a carrier frequency among two carrier frequencies adjacent to each other, and deciding a power intensity of the first RF signal so that the first RF signal is transmitted over the entire coverage region of the base station; and

converting the second IF signal into a second RF signal having the other carrier frequency among the carrier frequencies adjacent to each other, and deciding a power intensity of the second RF signal so that the second RF signal is transmitted over a predetermined region around the base station, wherein the power intensity of the second RF signal is set to be lower than a predetermined threshold intensity.

12. The method of claim 11, wherein the second data is a unicast signal or additional data of the first data.

13. A method for transmitting multi-carriers to provide a multicast service in a base station using a multi-input and multi-output (MIMO) scheme, comprising:

mapping first data for providing the multicast service, and second data different from the first data, to first and second antennas, respectively;

converting the first data and the second data into a first Intermediate Frequency (IF) signal and a second IF signal, respectively;

converting the first IF signal into a first RF signal having a lower carrier frequency among two carrier frequencies not adjacent to each other; and

converting the second IF signal into a second RF signal having a higher carrier frequency among the carrier frequencies not adjacent to each other.

14. The method of claim 13, wherein the second data is a unicast signal or additional data of the first data.

15. A method for transmitting multi-carriers to provide a multicast service in a base station using a multi-input and multi-output (MIMO) scheme, comprising:

multiplying first data for providing the multicast service, and second data different from the first data by first and second weights according to the MIMO scheme, respectively, thereby encoding the first data and the second data to first encoded data and second encoded data, respectively;

logically mapping the first encoded data and the second encoded data to first and second antennas that are to transmit the first encoded data and the second encoded data, respectively, thereby generating a first mapped signal and a second mapped signal;

converting the first mapped signal into a first transmission-band RF signal of a carrier corresponding to the first mapped signal, and the second mapped signal into a second transmission-band RF signal of a carrier corresponding to the second mapped signal, respectively; and

transmitting the first transmission-band RF signal through the first antenna and the second transmission-band RF signal through the second antenna.