Method of transmitting system information related to point-to multipoint service

1. A method of receiving system information performed by a user equipment (UE), the method comprising:

receiving, from a network, an indicator indicating a change of system information related to a point-to-multipoint service on a physical control channel; and

receiving changed system information related to the point-to-multipoint service in response to the indicator,

wherein the point-to-multipoint service is a multimedia broadcast multicast service (MBMS),

wherein the indicator is included within a system change identifier field of a downlink control information (DCI),

wherein the system change identifier field has one bit,

wherein a format of the DCI further includes at least one of: a resource allocation header field, a resource block assignment field, a modulation and coding scheme field, a new data indicator field, a hybrid automatic repeat request (HARQ) process number field, a redundancy version field, and a downlink assignment index field,

wherein the format of the DCI further includes a bit map to indicate one or more Multimedia Broadcast multicast service Single Frequency Network (MBSFN) areas in which the system information is changed, and

wherein the changed system information related to the point-to-multipoint service is received through a system information block (SIB) type thirteen.

2. The method of claim 1 , wherein the physical control channel is a physical downlink control channel (PDCCH).

3. The method of claim 2 , wherein the point-to-multipoint service is a multimedia broadcast multicast service (MBMS) and an MBMS Radio Network Temporary Identifier (M-RNTI) is received on the PDCCH.

4. The method of claim 3 , wherein a Multimedia Broadcast multicast service Single Frequency Network (MBSFN) area identifier is received on the PDCCH.

5. The method of claim 1 , further comprising receiving MBMS control information through a Multicast Control Channel (MCCH) based on the changed system information related to the point-to-multipoint service.

6. The method of claim 5 , wherein the indicator is received during a first modification period and the MBMS control information is received during a second modification period, and wherein the second modification period is a next modification period of the first modification period.

7. A method of transmitting system information performed by a network, the method comprising:

transmitting, to a user equipment (UE), an indicator indicating a change of system information related to a point-to-multipoint service on a physical control channel; and

transmitting, to the UE, changed system information related to the point-to-multipoint service after transmitting the indicator,

wherein the point-to-multipoint service is a multimedia broadcast multicast service (MBMS),

wherein the indicator is included within a system change identifier field of a downlink control information (DCI),

wherein the system change identifier field has one bit,

wherein a format of the DCI further includes at least one of a resource allocation header field, a resource block assignment field, a modulation and coding scheme field, a new data indicator field, a hybrid automatic repeat request (HARQ) process number field, a redundancy version field, and a downlink assignment index field,

wherein the format of the DCI further includes a bit map to indicate one or more Multimedia Broadcast multicast service Single Frequency Network (MBSFN) areas in which the system information is changed, and

wherein the changed system information related to the point-to-multipoint service is transmitted through a system information block (SIB) type thirteen.

8. The method of claim 7 , wherein the physical control channel is a physical downlink control channel (PDCCH).

9. The method of claim 8 , wherein the point-to-multipoint service is a multimedia broadcast multicast service (MBMS) and an MBMS Radio Network Temporary Identifier (M-RNTI) is transmitted on the PDCCH.

10. The method of claim 9 , wherein a Multimedia Broadcast multicast service Single Frequency Network (MBSFN) area identifier is transmitted on the PDCCH.

11. The method of claim 7 , further comprising transmitting, to the UE, MBMS control information through a Multicast Control Channel (MCCH) after transmitting the changed system information related to the point-to-multipoint service.

12. The method of claim 11 , wherein the indicator is transmitted during a first modification period and the MBMS control information is transmitted during a second modification period, and wherein the second modification period is a next modification period of the first modification period.