Method for transmitting a sounding reference signal in a LTE TDD system
A method for transmitting an uplink Sounding Reference Signal (SRS) by a Long Term Evolution (LTE) User Equipment (UE). The UE receives information indicating an SRS transmission, generates an SRS, and transmits the SRS in two OFDM symbol in a half-frame or frame, if the information indicates that a period of SRS transmission is 2 ms.
1. A method for transmitting an uplink Sounding Reference Signal (SRS) by a User Equipment (UE) in a communication system, comprising:
receiving information related to an SRS period and an offset for an SRS transmission;
generating an SRS; and
transmitting, if the information indicates the SRS period is 2 ms, the SRS in two Single Carrier Frequency Division Multiple Access (SCFDMA) symbols in a half frame according to the offset for the SRS transmission,
wherein if the information indicates the SRS period is 2 ms, and the length of an Uplink Pilot Time Slot (UpPTS) in the half frame is two symbols, a first symbol in the UpPTS is indicated by offset 0 and a second symbol in the UpPTS is indicated by offset 1 , and
wherein if the information indicates the SRS period is 2 ms and the length of the UpPTS is one symbol, the symbol in the UpPTS is indicated by offset 1 .
2. The method of claim 1 , further comprising:
transmitting, if the information indicates the SRS period is not 2 ms, the SRS with the SRS period and the offset indicated by the information.
3. The method of claim 1 , wherein offsets 2 , 3 and 4 indicate a symbol in 2 nd, 3 rd and 4 th subframes, respectively.
4. The method of claim 3 , wherein the information related to the SRS period and the offset for SRS transmission is defined by Table 8.
5. A User Equipment (UE) for transmitting an uplink Sounding Reference Signal (SRS) in a communication system, comprising:
a receiver module for receiving information related to an SRS period and an offset for SRS transmission;
an SRS sequence generator for generating an SRS; and
a sequence transmission controller for transmitting, if the information indicates the SRS period is 2 ms, the SRS in two Single Carrier Frequency Division Multiple Access (SCFDMA) symbols in a half frame according to the offset for SRS transmission,
wherein if the information indicates the SRS period is 2 ms and the length of an Uplink Pilot Time Slot (UpPTS) in the half frame is two symbols, a first symbol in the UpPTS is indicated by offset 0 and a second symbol in the UpPTS is indicated by offset 1 , and
wherein if the information indicates the SRS period is 2 ms and the length of the UpPTS is one symbol, the symbol in the UpPTS is indicated by offset 1 .
6. The UE of claim 5 , wherein offsets 2 , 3 and 4 indicate a symbol in 2 nd, 3 rd and 4 th subframes, respectively.
7. The UE of claim 6 , wherein the information related to the SRS period and the offset for SRS transmission is defined by Table 8.
8. The UE of claim 7 , wherein the sequence transmission controller transmits, if the information indicates the SRS period is not 2 ms, the SRS with the SRS period and the offset indicated by the information.
9. A method for receiving an uplink Sounding Reference Signal (SRS) by a Base Station (BS) in a communication system, comprising:
transmitting information related to an SRS period and an offset for an SRS transmission to a User Equipment (UE); and
if the information indicates the SRS period is 2 ms, receiving the SRS in two Single Carrier Frequency Division Multiple Access (SCFDMA) symbols in a half frame according to the offset for SRS transmission from the UE,
wherein if the information indicates the SRS period is 2 ms and the length of an Uplink Pilot Time Slot (UpPTS) in the half frame is two symbols, a first symbol in the UpPTS is indicated by offset 0 and a second symbol in the UpPTS is indicated by offset 1 , and
wherein if the information indicates the SRS period is 2 ms and the length of the UpPTS is one symbol, the symbol in the UpPTS is indicated by offset 1 .
10. The method of claim 9 , wherein offsets 2 , 3 and 4 indicate a symbol in 2 nd, 3 rd and 4 th subframes, respectively.
11. The method of claim 10 , wherein the information related to the SRS period and the offset for SRS transmission is defined by Table 8.
12. The method of claim 11 , further comprising receiving, if the information indicates the SRS period is not 2 ms, the SRS with the SRS period and the offset indicated by the information from the UE.
13. A Base Station (BS) for receiving an uplink Sounding Reference Signal (SRS) in a communication system, comprising:
a transmitter module for transmitting information related to an SRS period and an offset for SRS transmission to a User Equipment (UE) ; and
a receiver module for receiving, if the information indicates the SRS period is 2 ms, the SRS in two Single Carrier Frequency Division Multiple Access (SCFDMA) symbols in a half frame according to the offset for SRS transmission,
wherein if the information indicates the SRS period is 2 ms and the length of an Uplink Pilot Time Slot (UpPTS) in the half frame is two symbols, a first symbol in the UpPTS is indicated by offset 0 and a second symbol in the UpPTS is indicated by offset 1 , and
wherein if the information indicates the SRS period is 2 ms and the length of the UpPTS is one symbol, the symbol in the UpPTS is indicated by offset 1 .
14. The BS of claim 13 , wherein offsets 2 , 3 and 4 indicate a symbol in 2 nd, 3 rd and 4 th subframes, respectively.
15. The BS of claim 14 , wherein the information related to the SRS period and the offset for SRS transmission is defined by Table 8.
16. The BS of claim 15 , wherein the receiver module receives, if the information indicates the SRS period is not 2 ms, the SRS with the SRS period and the offset indicated by the information.