Method for deciding radio bearer of mobile IPTV system

1. A method for a multicast coordination entity (MCE) to determine a radio bearer in a mobile IPTV system for transmitting same contents to a plurality of terminals, comprising:

receiving identifiers of contents selected by the terminals and radio channel information from the terminals; and

determining the radio bearer by considering at least one of a share of a usage anticipation subcarrier for each identifier of the contents, a share of the subcarrier influenced by a neighboring cell, and a number of terminals desiring the contents.

2. The method of claim 1 , wherein the determining includes,

determining one of a unicast transmission method of a point-to-point radio bearer and a multicast transmission method of a point-to-multipoint radio bearer according to a share of the usage anticipation subcarrier.

3. The method of claim 2 , further comprising:

when it is determined to be the multicast transmission method of the point-to-multipoint radio bearer, allocating a physical resource of a transport channel used for the multicast transmission method of the point-to-multipoint radio bearer by using the radio channel information.

4. The method of claim 2 , further comprising:

when it is determined to be the unicast transmission method of the point-to-point radio bearer, transmitting the radio channel information to a base station wirelessly communicating with the terminals, wherein a physical resource of a transport channel used for the unicast transmission method of the point-to-point radio bearer is allocated based on the radio channel information of the base station.

5. The method of claim 3 , wherein

the radio channel information includes N pieces of sub-band information in the worst channel state and signal to interference and noise ratio (SINR) information on subcarriers other than the N pieces of sub-band information, and

N is a positive integer.

6. The method of claim 5 , wherein

the radio resource is allocated by considering the SINR of the subcarriers other than the N pieces of sub-band information from among available subcarriers.

7. The method of claim 1 , wherein

the determining includes determining the radio bearer in the order of identifiers of the contents with a lesser number of terminals.

8. The method of claim 1 , wherein

the determining includes:

finding the share of usage anticipation subcarriers for respective identifiers of the contents;

when the share of the usage anticipation subcarrier is less than a reference value, determining a unicast transmission method of a point-to-point radio bearer; and

when the share of the usage anticipation subcarrier is greater than the reference value, determining a multicast transmission method of a point-to-multipoint radio bearer,

wherein the reference value is set by a usage share of the current subcarrier and a share of the subcarrier influenced by neighboring cells.

9. The method of claim 8 , wherein

the finding of the share includes

finding the share of the usage anticipation subcarrier by dividing the product of the subcarrier occupied by the contents and a number of terminals desiring the contents by the entire subcarriers.

10. A method for a multicast coordination entity (MCE) to determine a radio bearer in a mobile IPTV system for transmitting the same contents to a plurality of terminals, comprising:

receiving identifiers of contents selected by the terminals from the terminals;

finding a share of usage anticipation subcarriers for respective identifiers of the contents;

determining it to be a point-to-point radio bearer when the share of the usage anticipation subcarrier is less than a reference value; and

determining it to be a point-to-multipoint radio bearer when the share of the usage anticipation subcarrier is greater than the reference value,

wherein the reference value is determined by a usage share of the current subcarrier and a share of the subcarrier influenced by a neighboring cells, and

the share of the usage anticipation subcarrier is determined by a number of subcarriers occupied by the contents and a number of terminals having selected the contents.

11. The method of claim 10 , further comprising:

receiving radio channel information from the terminals; and

allocating a radio resource of the point-to-multipoint radio bearer by using the radio channel information when it is determined to be the point-to-multipoint radio bearer.

12. The method of claim 10 , further comprising:

receiving radio channel information from the terminals; and

transmitting the radio channel information to a base station wirelessly communicating with the terminals when it is determined to be the point-to-point radio bearer,

wherein the base station allocates the radio resource of the point-to-point radio bearer by using the radio channel information.

13. The method of claim 11 , wherein

the radio channel information includes at least one piece of sub-band information in the worst channel state and signal to interference and noise ratio (SINR) information on subcarriers other than the at least one piece of sub-band information.

14. The method of claim 10 , wherein

the point-to-point radio bearer or the point-to-multipoint radio bearer is selected starting from the identifier of the contents with a lesser number of terminals.

15. A method for a multicast coordination entity (MCE) to determine a radio bearer in a mobile IPTV system for transmitting same contents to a plurality of terminals, comprising:

receiving identifiers of contents selected by the terminals from the terminals;

calculating a number of terminals for respective identifiers of the contents; and

determining a radio bearer by considering at least one of a share of usage anticipation subcarriers of the contents, a share of the subcarrier influenced by a neighboring cell, and a number of terminal desiring the contents starting from an identifier of contents with a lesser number of terminals.

16. The method of claim 15 , wherein

the share of the usage anticipation subcarrier is determined by a number of subcarriers occupied by the contents and a number of terminals having selected the contents.

17. The method of claim 16 , wherein

the determining includes:

when the share of the usage anticipation subcarrier is less than a reference value, selecting a unicast transmission method of a point-to-point radio bearer; and

when the share of the usage anticipation subcarrier is greater than the reference value, selecting a multicast transmission method of a point-to-multipoint radio bearer,

wherein the reference value is set by a usage share of the current subcarrier and a share of the subcarrier influenced by neighboring cells.

18. The method of claim 16 , further comprising:

receiving radio channel information from the terminals,

wherein a physical resource of the radio bearer selected by using the radio channel information is allocated.