Method for allocating PHICH and generating reference signal in system using single user MIMO based on multiple codewords when transmitting uplink
The present invention relates to a method for generating an uplink reference signal in a system supporting plural uplink-access transmission modes. The method comprises: a step for transmitting the reference signal configuration information about the configuration of a reference signal from a base station to a user device through an uplink grant PDCCH (Physical Downlink Control Channel), and a step for receiving from the user device a sub-frame including the reference signal that is generated based on the reference signal configuration information. The reference signal configuration information is prepared for plural uplink access transmission modes and includes a cyclic shift value for the sequence of the reference signal. The reference signal is supposed to be transmitted to an uplink, and the user device is set up to be operated in the uplink-access transmission mode that corresponding to the reference signal configuration information.
1. A method of receiving a Physical Hybrid automatic repeat request Indicator Channel (PHICH) by a user equipment (UE) from a base station, the method comprising:
transmitting multiple units of data to the base station through an uplink resource by using multiple antennas of the UE, wherein each of the multiple units of data corresponds to an index ‘i’, wherein ‘i’ is an integer;
determining a PHICH resource to receive the PHICH carrying ACKnowledgement/Negative ACKnowledgement (ACK/NACK) with respect to each of the transmitted multiple units of data, wherein the PHICH resource for each of the multiple units of data (i) is identified by a pair of a PHICH group index (n PHICH group (i)) and an orthogonal sequence index within the PHICH group, wherein the PHICH group index (n PHICH group (i)) for each of the multiple units of data (i) is identified by:
( I PRB _ RA lowest _ index +n RS seq ( i )+ f ( i ))mod N PHICH group +I PHICH N PHICH group
wherein I PRB _ RA lowest _ index indicates the index for PHICH resource determination, n RS seq (i) indicates a cyclic shift value for demodulation reference signal, f(i) is defined to correspond to ‘i’, N PHICH group indicates the number of PHICH group, and I PHICH is 1 or 0 depending on configuration; and
receiving the PHICH from the base station through the determined PHICH resource.
2. The method of claim 1 , wherein each of the multiple units of data corresponds to a codeword.
3. The method of claim 1 , wherein the multiple units of data are simultaneously transmitted based on the uplink grant information received from the base station within one unit of time.
4. The method of claim 1 , wherein the UE operates in a Single-User Multiple Input Multiple Output (SU-MIMO) mode to transmit the multiple units of data.
5. A method of transmitting a Physical Hybrid automatic repeat request Indicator Channel (PHICH) to a user equipment (UE) by a base station, the method comprising:
transmitting an uplink grant signal identifying an uplink resource to be used by the UE;
receiving multiple units of data from multiple antennas of the UE in response to the uplink grant signal, wherein each of the multiple units of data corresponds to an index ‘i’, wherein ‘i’ is an integer; and
transmitting the PHICH carrying ACKnowledgement/Negative ACKnowledgement (ACK/NACK) with respect to each of the transmitted multiple units of data to the UE through the PHICH resource, wherein the PHICH resource for each of the multiple units of data (i) is identified by a pair of a PHICH group index (n PHICH group (i)) and an orthogonal sequence index within the PHICH group, wherein the PHICH group index (n PHICH group (i)) for each of the multiple units of data (i) is identified by:
( I PRB _ RA lowest _ index +n RS seq ( i )+ f ( i ))mod N PHICH group +I PHICH N PHICH group
wherein I PRB _ RA lowest _ index indicates the index for PHICH resource determination, n RS seq (i) indicates a cyclic shift value for demodulation reference signal, f(i) is defined to correspond to ‘i’, N PHICH group indicates the number of PHICH group, and I PHICH is 1 or 0 depending on configuration.
6. The method of claim 5 , wherein each of the multiple units of data corresponds to a codeword.
7. The method of claim 5 , wherein the multiple units of data are received in response to one uplink grant signal.
8. The method of claim 5 , wherein the base station supports the UE operating in a Single-User Multiple Input Multiple Output (SU-MIMO) mode.