Method and device for transmitting/receiving data using transport block size defined for machine type communication terminal in wireless access system supporting machine type communication
The present invention relates to a wireless access system supporting machine type communication (MTC), and to various methods for an MTC terminal transmitting/receiving data. A method for an MTC terminal receiving data in a wireless access system supporting MTC, as one embodiment of the present invention, may comprise the steps of: receiving a modulation and coding scheme (MCS) index indicating a MCS, and a physical resource block (PRB) index indicating the size of a PRB allocated to a MTC terminal; checking a transport block size (TBS) index that is mapped with the MCS index and deriving a TBS on the basis of the TBS index and the PRB index; and on the basis of the TBS, decoding a physical downlink shared channel (PDSCH) in order to receive data. Here, the size of the MCS index is configured to be a 4-bit size, and the TBS index may be configured so as to support only from 0 to 9 for the MTC terminal.
1. A method for receiving data by a machine type communication (MTC) user equipment (UE) in a wireless access system supporting an MTC, the method comprising:
receiving a higher layer signal comprising information on a set of repetition numbers for the data, wherein the set of repetition numbers is related to a coverage enhance (CE) level of the MTC UE;
receiving modulation and coding scheme (MCS) information on an MCS index and resource allocation information for the MTC UE;
obtaining a transmission block size (TBS) based on a TBS index and the resource allocation information,
wherein the TBS index is obtained based on the MCS index,
wherein the TBS index is within a predetermined range,
wherein the predetermined range is configured to a part of TBS indexes, from 0 to 9, included in a TBS table, and
wherein the TBS table is configured to support a legacy UE; and
receiving the data repeatedly based on the set of repetition numbers and the TBS.
2. The method of claim 1 , wherein the TBS is obtained based on the TBS index, the resource allocation information and a repetition number of the set of repetition numbers.
3. The method of claim 1 , wherein the MCS information is configured to have a 4-bit size.
4. A machine type communication (MTC) user equipment (UE) for receiving data in a wireless access system supporting an MTC, the MTC UE comprising:
a memory; and,
at least one processor coupled with the memory and configured to:
receive a higher layer signal comprising information on a set of repetition numbers for the data, wherein the set of repetition numbers is related to a coverage enhance (CE) level of the MTC UE;
receive modulation and coding scheme (MCS) information on an MCS index and resource allocation information for the MTC UE; and
obtain a transmission block size (TBS) based on a TBS index and the resource allocation information,
wherein the TBS index is obtained based on the MCS index,
wherein the TBS index is within a predetermined range,
wherein the predetermined range is configured to a part of TBS indexes, from 0 to 9, included in a TBS table, and
wherein the TBS table is configured to support a legacy UE; and
receive the data repeatedly based on the set of repetition numbers and the TBS.
5. The MTC UE of claim 4 , wherein the TBS is obtained based on the TBS index, the resource allocation information and a repetition number of the set of repetition numbers.
6. The MTC UE according of claim 4 , wherein the MCS information is configured to have a 4-bit size.
7. A method for transmitting data by a base station in a wireless access system supporting a machine type communication (MTC), the method comprising:
transmitting, to an MTC user equipment (MTC UE), a higher layer signal comprising information on a set of repetition numbers for the data, wherein the set of repetition numbers is related to a coverage enhance (CE) level of the MTC UE;
transmitting, to the MTC UE, modulation and coding scheme (MCS) information on an MCS index and resource allocation information for the MTC UE; and
transmitting, to the MTC UE, the data repeatedly based on the set of repetition numbers and a transmission block size (TBS),
wherein the TBS is obtained based on a TBS index and the resource allocation information,
wherein the TBS index is obtained based on the MCS index,
wherein the TBS index is within a predetermined range,
wherein the predetermined range is configured to a part of TBS indexes, from 0 to 9, included in a TBS table, and
wherein the TBS table is configured to support a legacy UE.
8. The method of claim 7 , wherein the TBS is obtained based on the TBS index, the resource allocation information and a repetition number of the set of repetition numbers.
9. The method of claim 7 , wherein the MCS information is configured to have a 4-bit size.
10. A base station for transmitting data in a wireless access system supporting a machine type communication (MTC), the base station comprising:
a memory; and,
at least one processor coupled with the memory and configured to:
transmit, to an MTC user equipment (MTC UE), a higher layer signal comprising information on a set of repetition numbers for the data, wherein the set of repetition numbers is related to a coverage enhance (CE) level of the MTC UE;
transmit, to the MTC UE, modulation and coding scheme (MCS) information on an MCS index and resource allocation information for the MTC UE; and
transmit, to the MTC UE, the data repeatedly based on the set of repetition numbers and a transmission block size (TBS),
wherein the TBS is obtained based on a TBS index and the resource allocation information,
wherein the TBS index is obtained based on the MCS index,
wherein the TBS index is within a predetermined range,
wherein the predetermined range is configured to a part of TBS indexes, from 0 to 9, included in a TBS table, and
wherein the TBS table is configured to support a legacy UE.
11. The base station of claim 10 , wherein the TBS is obtained based on the TBS index, the resource allocation information and a repetition number of the set of repetition numbers.
12. The base station of claim 10 , wherein the MCS information is configured to have a 4-bit size.