Method and apparatus for tranceiving common control message in wireless access system supporting narrow band internet of things
Provided are methods for repeatedly transceiving a common control message for a machine-type communication (MTC) terminal in a wireless access system supporting MTC, and apparatuses supporting the methods. A method for receiving a common control message for an MTC terminal in a wireless access system supporting MTC according to one embodiment of the present invention may comprise the steps of: receiving a channel status information reference signal (CSI-RS); and receiving a common control message from a subframe in which the CSI-RS is received. Here, the common control message can be configured so as to be repeatedly transmitted from a previously configured number of subframes comprising the subframe.
1. A method for transmitting a common control message in a wireless access system supporting Narrow Band Internet of Things (NB-IoT), the method comprising:
allocating a bandwidth for the NB-IoT; and
transmitting the common control message in the allocated bandwidth,
wherein the bandwidth for the NB-IoT is allocated to be aligned with a boundary of a Physical Resource Block (PRB) used in a legacy system,
wherein a PRB which minimizes an offset between a center frequency of the bandwidth for the NB-IoT and a center frequency of the PRB used in the legacy system is allocated as the bandwidth for the NB-IoT, in consideration of a bandwidth of the legacy system,
wherein the offset has a non-zero value, and the center frequency of the bandwidth for the NB-IoT is not equal to the center frequency of the PRB used in the legacy system, and
wherein the PRB allocated as the bandwidth for the NB-IoT is not used as a Distributed Virtual Resource Block (DVRB) in the legacy system.
2. The method according to claim 1 , wherein Virtual Resource Blocks (VRBs) which are mapped to the PRB allocated as the bandwidth for the NB-IoT are used for the transmission of the common control message.
3. The method according to claim 1 , wherein the bandwidth for the NB-IoT is allocated other than a VRB affecting center 6 RBs of the legacy system.
4. The method according to claim 1 , wherein the common control message is transmitted repeatedly a predetermined number of times.
5. An apparatus for transmitting a common control message in a wireless access system supporting Narrow Band Internet of Things (NB-IoT), the method comprising:
a transmitter; and
a processor for supporting transmission of the common control message,
wherein the processor allocates a bandwidth for the NB-IoT, and transmits the common control message in the allocated bandwidth by controlling the transmitter,
wherein the bandwidth for the NB-IoT is allocated to be aligned with a boundary of a Physical Resource Block (PRB) used in a legacy system,
wherein a PRB which minimizes an offset between a center frequency of the bandwidth for the NB-IoT and a center frequency of the PRB used in the legacy system is allocated as the bandwidth for the NB-IoT, in consideration of a bandwidth of the legacy system,
wherein the offset has a non-zero value, and the center frequency of the bandwidth for the NB-IoT is not equal to the center frequency of the PRB used in the legacy system, and
wherein the PRB allocated as the bandwidth for the NB-IoT is not used as a Distributed Virtual Resource Block (DVRB) in the legacy system.
6. The apparatus according to claim 5 , wherein Virtual Resource Blocks (VRBs) which are mapped to the PRB allocated as the bandwidth for the NB-IoT are used for the transmission of the common control message.
7. The apparatus according to claim 5 , wherein the bandwidth for the NB-IoT is allocated other than a VRB affecting center 6 RBs of the legacy system.
8. The apparatus according to claim 5 , wherein the common control message is transmitted repeatedly a predetermined number of times.