Method for transmitting/receiving a machine type communication physical downlink control channel
A method for transmitting an MTC physical downlink control channel (MPDCCH) by a base station in a wireless communication system supporting machine type communication (MTC). A base station transmits, to a terminal. configuration information related to the transmission of an MPDCCH and maps the MPDCCH onto multiple resource elements (REs) of at least one first symbol constituting a first slot of a special subframe. The special subframe is a subframe in which, among symbols constituting the subframe, the number of symbols for data transmission is smaller than or equal to a predetermined number. The base station transmits the MPDCCH to the terminal over the multiple resource elements, wherein the mapping step is performed by copying at least one second symbol of a second slot adjacent to the first slot onto the at least one first symbol.
1. A method of receiving a Machine Type Communication (MTC) Physical Downlink Control Channel (MPDCCH), by a terminal, in a wireless communication system supporting MTC, the method comprising:
receiving, from a base station, configuration information related to transmission of the MPDCCH; and
receiving, from the base station, the MPDCCH,
wherein a control region includes first L symbols (1≤L≤4, L is a natural number) in a subframe based on the configuration information, and
wherein based on symbol indexes in the subframe being 0, 1, . . . , 13 in a time domain, and
based on L=1, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0,
based on L=2, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1,
based on L=3, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1, the MPDCCH mapped to a symbol with symbol index 9 is additionally mapped to a symbol with symbol index 2, and
based on L=4, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1, the MPDCCH mapped to a symbol with symbol index 9 is additionally mapped to a symbol with symbol index 2, the MPDCCH mapped to a symbol with symbol index 10 is additionally mapped to a symbol with symbol index 3.
2. The method of claim 1 , wherein the MPDCCH is mapped based on an identical mapping pattern in the at least one first symbol to which the MPDCCH is additionally mapped and the at least one second symbol to which the MPDCH is initially mapped.
3. The method of claim 1 , wherein a cell-specific reference signal is mapped to an identical RE in the at least one first symbol to which the MPDCCH is additionally mapped and the at least one second symbol to which the MPDCH is initially mapped.
4. The method of claim 1 , wherein a first slot in the subframe includes the control region and a data region in which the MPDCCH or a Physical Downlink Shared Channel (PDSCH) is transmitted.
5. The method of claim 4 , wherein rate matching is performed in the data region in preference to the control region.
6. The method of claim 1 , wherein a channel estimation of the MPDCCH is performed using a channel estimation result of at least one other subframe contiguous to the subframe.
7. A terminal for receiving a Machine Type Communication (MTC) Physical Downlink Control Channel (MPDCCH) in a wireless communication system supporting MTC, the terminal comprising:
a transmitter for transmitting a radio signal;
a receiver for receiving a radio signal;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations,
the operation comprising:
receiving, from a base station, configuration information related to transmission of the MPDCCH; and
receiving, from the base station, the MPDCCH,
wherein a control region includes first L symbols (1≤L≤4, L is a natural number) in a subframe based on the configuration information, and
wherein based on symbol indexes in the subframe being 0, 1, . . . , 13 in a time domain,
based on L=1, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0,
based on L=2, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1,
based on L=3, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1, the MPDCCH mapped to a symbol with symbol index 9 is additionally mapped to a symbol with symbol index 2, and
based on L=4, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1, the MPDCCH mapped to a symbol with symbol index 9 is additionally mapped to a symbol with symbol index 2, the MPDCCH mapped to a symbol with symbol index 10 is additionally mapped to a symbol with symbol index 3.
8. The terminal of claim 7 , wherein the MPDCCH is mapped based on an identical mapping pattern in the at least one first symbol to which the MPDCCH is additionally mapped and the at least one second symbol to which the MPDCH is initially mapped.
9. The terminal of claim 7 , wherein a cell-specific reference signal is mapped to an identical RE in the at least one first symbol to which the MPDCCH is additionally mapped and the at least one second symbol to which the MPDCH is initially mapped.
10. The terminal of claim 7 , wherein a first slot in the subframe includes the control region and a data region in which the MPDCCH or a Physical Downlink Shared Channel (PDSCH) is transmitted.
11. The terminal of claim 10 , wherein rate matching is performed in the data region in preference to the control region.
12. The terminal of claim 10 , wherein a channel estimation of the MPDCCH is performed using a channel estimation result of at least one other subframe contiguous to the subframe.
13. A method of transmitting a Machine Type Communication (MTC) Physical Downlink Control Channel (MPDCCH), by a base station, in a wireless communication system supporting MTC, the method comprising:
transmitting, to a terminal, configuration information related to transmission of the MPDCCH; and
transmitting, to the terminal, the MPDCCH,
wherein a control region includes first L symbols (1≤L≤4, L is a natural number) in a subframe based on the configuration information, and
wherein based on symbol indexes in the subframe being 0, 1, . . . , 13 in a time domain,
based on L=1, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0,
based on L=2, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1,
based on L=3, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1, the MPDCCH mapped to a symbol with symbol index 9 is additionally mapped to a symbol with symbol index 2, and
based on L=4, the MPDCCH mapped to a symbol with symbol index 7 is additionally mapped to a symbol with symbol index 0, the MPDCCH mapped to a symbol with symbol index 8 is additionally mapped to a symbol with symbol index 1, the MPDCCH mapped to a symbol with symbol index 9 is additionally mapped to a symbol with symbol index 2, the MPDCCH mapped to a symbol with symbol index 10 is additionally mapped to a symbol with symbol index 3.
14. The method of claim 1 , wherein the subframe is a special subframe in which a number of symbols for data transmission among symbols in a subframe is less than a certain number.