Method of transmitting scheduling reference signal
A method of transmitting a scheduling reference signal (SRS) for uplink scheduling is provided. The method includes transmitting a SRS on a first partial SRS transmission band in a first transmitting time, and transmitting the SRS on a second partial SRS transmission band in a second transmitting time, wherein the first and the second partial SRS transmission bands are parts of a full SRS transmission band and have exclusive positions with each other in the full SRS transmission band, the full SRS transmission band selected for uplink scheduling, the full SRS transmission band comprising a plurality of partial SRS transmission bands.
1. A method of transmitting a scheduling reference signal (SRS) for uplink scheduling, the method comprising:
receiving band information and subcarrier information that are used for a partial SRS, the band information indicating a bandwidth and the subcarrier information indicating subcarriers;
dividing a scheduled full SRS transmission band into N sub-bands;
generating N partial SRSs, each of the N partial SRSs corresponding to one of the N sub-bands; and
transmitting the N partial SRSs one-by-one via N sub-frames by using the subcarriers,
wherein each of the N sub-bands has the indicated bandwidth and none of the N sub-bands is overlapped with any other sub-band,
wherein N is a natural number greater than 1 and is determined by dividing the full SRS transmission band by the bandwidth,
wherein each of the N sub-frames comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols,
wherein each of the N partial SRSs is transmitted via one of the OFDM symbols,
wherein the first partial SRSs are generated by cyclically shifting a base sequence by a first cyclic shift (CS) amount,
wherein the second partial SRSs are generated by cyclically shifting the base sequence by a second CS amount, and
the first CS amount is different from the second CS amount.
2. The method of claim 1 , wherein:
the full SRS transmission band is 20 MHz; and
the bandwidth is 5 MHz or 10 MHz.
3. The method of claim 1 , wherein the subcarrier information further indicates subcarriers having an even-numbered index or subcarriers having an odd-numbered index.
4. A method of receiving a scheduling reference signal (SRS) for uplink scheduling, the method comprising:
scheduling a full SRS transmission band for a first user equipment (UE) and a second UE;
transmitting first band information and first subcarrier information that are used for first partial SRSs, the first band information indicating a first bandwidth and the first subcarrier information indicating first subcarriers;
transmitting second band information and second subcarrier information that are used for second partial SRSs, the second band information indicating a second bandwidth and the second subcarrier information indicating second subcarriers;
receiving the first partial SRSs one-by-one via N sub-bands by using the first subcarriers, each of the first partial SRSs corresponding to one of the N sub-bands; and
receiving the second partial SRSs one-by-one via M sub-bands by using the second subcarriers, each of the second partial SRSs corresponding to one of the M sub-bands,
wherein each of the N sub-bands has the first bandwidth and none of the N sub-bands is overlapped with any other sub-band,
wherein each of the M sub-bands has the second bandwidth and none of the M sub-bands is overlapped with any other sub-band,
wherein N is a natural number greater than 1 and is determined by dividing the full SRS transmission band by the first bandwidth,
wherein M is a natural number greater than 1 and is determined by dividing the full SRS transmission band by the second bandwidth,
wherein each of the N sub-frames and M sub-frames comprise a plurality of orthogonal frequency division multiplexing (OFDM) symbols,
wherein the first partial SRSs and the second partial SRSs are received via an identical OFDM symbol in overlapping sub-frames among the N sub-frames and M sub-frames,
wherein the first partial SRSs are generated by cyclically shifting a base sequence by a first cyclic shift (CS) amount,
wherein the second partial SRSs are generated by cyclically shifting the base sequence by a second CS amount, and
the first CS amount is different from the second CS amount.
5. The method of claim 4 , wherein:
the full SRS transmission band is 20 MHz;
the first bandwidth is 5 MHz or 10 MHz; and
the second bandwidth is 5 MHz or 10 MHz.
6. The method of claim 4 , wherein:
the first subcarrier information indicates subcarriers having an even-numbered index; and
the second subcarrier information indicates subcarriers having an odd-numbered index.