Uplink transmission method and apparatus using extended uplink subframe
In an uplink transmission method of a first communication node, the first communication node receives a reference signal configuration for an UpPTS (uplink pilot time slot) from a second communication node when the UpPTS of a special subframe and a first uplink (UL) subframe are aggregated as an extended UL subframe. Also, the first communication node allocates a reference signal to the first UL subframe of the UpPTS and the first UL subframe based on the reference signal configuration when a number of time domain symbols belonging to the UpPTS is a predetermined number or less.
1. A transmission method of uplink data by a first communication node, the transmission method comprising:
receiving a demodulation-reference signal (DM-RS) configuration for an uplink pilot time slot (UpPTS) of a special subframe from a second communication node;
transmitting the uplink data in the UpPTS when a number of time domain symbols belonging to the UpPTS is a predetermined number; and
transmitting a DM-RS for the uplink data transmitted in the UpPTS based on the DM-RS configuration,
wherein when the DM-RS for the uplink data is transmitted in the UpPTS based on the DM-RS configuration, the DM-RS is allocated to a fourth time domain symbol from a last time domain symbol among the time domain symbols belonging to the UpPTS.
2. The transmission method of claim 1 , wherein the predetermined number is 6.
3. The transmission method of claim 1 , wherein transmitting a DM-RS for the uplink data transmitted in the UpPTS based on the DM-RS configuration includes transmitting, in the UpPTS, no DM-RS for the uplink data when one time domain symbol is allocated for the uplink data transmitted in the UpPTS.
4. The transmission method of claim 3 , further comprising transmitting, in a uplink subframe following the UpPTS, the DM-RS for the uplink data transmitted in the UpPTS when the one time domain symbol is allocated for the uplink data transmitted in the UpPTS.
5. The transmission method of claim 4 , wherein:
the uplink subframe includes a first slot and a second slot following the first slot, and
an orthogonal cover code (OCC) or a cyclic shift for the DM-RS for the uplink data transmitted in the UpPTS is the same as an OCC or a cyclic shift for a DM-RS allocated to the second slot.
6. The transmission method of claim 1 , wherein the same physical uplink shared channel (PUSCH) transmit power control (TPC) is applied to the UpPTS in the special subframe and the uplink subframe.
7. The transmission method of claim 1 , further comprising receiving one UL grant for scheduling of an extended uplink subframe in which the UpPTS and the uplink subframe are aggregated from the second communication node,
wherein the one UL grant is based on an index of the uplink subframe.
8. The transmission method of claim 1 , further comprising
transmitting a physical uplink shared channel (PUSCH) for a retransmission in an extended uplink subframe of which an index is (n+k) when receiving a physical hybrid automatic repeat and request indicator channel (PHICH) from the second communication node in a downlink subframe of which an index is n,
wherein the UpPTS and the uplink subframe are aggregated in the extended uplink subframe, an index of the uplink subframe is (n+k), and an index of the special subframe is (n+k−1).
9. The transmission method of claim 1 , further comprising:
transmitting a physical uplink shared channel (PUSCH) to the second communication node in an extended UL subframe having an index of (n−k); and
receiving a physical hybrid automatic repeat and request indicator channel (PHICH) for the PUSCH from the second communication node in a downlink subframe having an index of n,
wherein the UpPTS and the uplink subframe are aggregated in the extended uplink subframe, an index of the uplink subframe is (n−k), and an index of the special subframe is (n−k−1).