Method for determining pilot symbol position, user equipment and base station

1. A method for determining pilot symbol position, comprising:

determining a pattern of candidate pilot symbol positions for an uplink sTTI (shortened Transmission Time Interval) transmission in an uplink sub-frame;

receiving an uplink grant from a base station, where the uplink grant is used to schedule the uplink sTTI transmission; and

determining at least one pilot symbol position for an uplink sTTI based on the pattern of candidate pilot symbol positions and position indication information in the uplink grant,

wherein the position indication information in the uplink grant comprises a pilot symbol position identifier in the uplink grant, and determining at least one pilot symbol position for an uplink sTTI based on the pattern of candidate pilot symbol positions and position indication information in the uplink grant comprises:

reading the pilot symbol position identifier, where the pilot symbol position identifier has a length of one bit; and

based on the pilot symbol position identifier, in the pattern of candidate pilot positions, selecting an available pilot symbol position R, from SC-FDMA (Single-Carrier Frequency Division Multiple Access) symbol positions occupied by the uplink sTTI and positions before the SC-FDMA symbol positions occupied by the uplink sTTI, which is closest to the SC-FDMA symbol positions occupied by the uplink sTTI, to serve as the at least one pilot symbol position for the uplink sTTI,

or, in the pattern of candidate pilot positions, selecting a pilot symbol position R′, from the SC-FDMA symbol positions occupied by the uplink sTTI and the positions before the SC-FDMA symbol positions occupied by the uplink sTTI, which is closest to the available pilot symbol position R and different from the available pilot symbol position R, to serve as the at least one pilot symbol position for the uplink sTTI.

2. The method for determining pilot symbol position according to claim 1 , wherein determining a pattern of candidate pilot symbol positions for an uplink sTTI transmission in an uplink sub-frame comprises:

reading a pattern of pilot symbol positions pre-determined and agreed on with the base station, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.

3. The method for determining pilot symbol position according to claim 1 , wherein determining a pattern of candidate pilot symbol positions for an uplink sTTI transmission in an uplink sub-frame comprises:

receiving a signaling from the base station, where the signaling comprises a pattern of pilot symbol positions configured by the base station; and

obtaining the pattern of pilot symbol positions configured by the base station from the signaling received, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.

4. A method for determining pilot symbol position, comprising:

determining a pattern of candidate pilot symbol positions for an uplink sTTI (shortened Transmission Time Interval) transmission in an uplink sub-frame;

receiving an uplink grant from a base station, where the uplink grant is used to schedule the uplink sTTI transmission; and

determining at least one pilot symbol position for an uplink sTTI based on the pattern of candidate pilot symbol positions and position indication information in the uplink grant,

wherein the position indication information in the uplink grant comprises a transmission format of the uplink grant, the transmission format of the uplink grant comprises a DCI (Downlink Control Information) format of a single-user MIMO (Multiple-Input Multiple-Output) transmission or a DCI format of a multi-user MIMO transmission, and determining at least one pilot symbol position for an uplink sTTI based on the pattern of candidate pilot symbol positions and position indication information in the uplink grant comprises:

in the pattern of candidate pilot positions, selecting two available pilot symbol positions, from the SC-FDMA symbol positions occupied by the uplink sTTI and positions before the SC-FDMA symbol positions occupied by the uplink sTTI, which are closest to the SC-FDMA symbol positions occupied by the uplink sTTI, to serve as the at least one pilot symbol position for the uplink sTTI.

5. The method for determining pilot symbol position according to claim 4 , wherein determining a pattern of candidate pilot symbol positions for an uplink sTTI transmission in an uplink sub-frame comprises:

reading a pattern of pilot symbol positions pre-determined and agreed on with the base station, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.

6. The method for determining pilot symbol position according to claim 4 , wherein determining a pattern of candidate pilot symbol positions for an uplink sTTI transmission in an uplink sub-frame comprises:

receiving a signaling from the base station, where the signaling comprises a pattern of pilot symbol positions configured by the base station; and

obtaining the pattern of pilot symbol positions configured by the base station from the signaling received, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.

7. A UE (User Equipment), comprising:

a first pattern determining circuitry configured to: determine a pattern of candidate pilot symbol positions for an uplink sTTI (shortened Transmission Time Interval) transmission in an uplink sub-frame;

a receiving circuitry configured to: receive an uplink grant from a base station, wherein the uplink grant is used to schedule the uplink sTTI transmission; and

a pilot symbol position determining circuitry configured to: determine at least one pilot symbol position for an uplink sTTI based on the pattern of candidate pilot symbol positions and position indication information in the uplink grant,

wherein the position indication information in the uplink grant comprises a pilot symbol position identifier in the uplink grant, and the pilot symbol position determining circuitry is configured to read the pilot symbol position identifier, wherein the pilot symbol position identifier has a length of one bit; and

based on the pilot symbol position identifier, in the pattern of candidate pilot positions, select an available pilot symbol position R, from SC-FDMA (Single-Carrier Frequency Division Multiple Access) symbol positions occupied by the uplink sTTI and positions before the SC-FDMA symbol positions occupied by the uplink sTTI, which is closest to the SC-FDMA symbol positions occupied by the uplink sTTI, to serve as the at least one pilot symbol position for the uplink sTTI,

or, in the pattern of candidate pilot positions, select a pilot symbol position R′, from the SC-FDMA symbol positions occupied by the uplink sTTI and the positions before the SC-FDMA symbol positions occupied by the uplink sTTI, which is closest to the available pilot symbol position R and different from the available pilot symbol position R, to serve as the at least one pilot symbol position for the uplink sTTI.

8. The UE according to claim 7 , wherein the first pattern determining circuitry is configured to: read a pattern of pilot symbol positions pre-determined and agreed on with the base station, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.

9. The UE according to claim 7 , wherein the first pattern determining circuitry is configured to: receive a signaling from the base station, wherein the signaling comprises a pattern of pilot symbol positions configured by the base station; and obtain the pattern of pilot symbol positions configured by the base station from the signaling received, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.

10. A UE (User Equipment), comprising:

a first pattern determining circuitry configured to: determine a pattern of candidate pilot symbol positions for an uplink sTTI (shortened Transmission Time Interval) transmission in an uplink sub-frame;

a receiving circuitry configured to: receive an uplink grant from a base station, wherein the uplink grant is used to schedule the uplink sTTI transmission; and

a pilot symbol position determining circuitry configured to: determine at least one pilot symbol position for an uplink sTTI based on the pattern of candidate pilot symbol positions and position indication information in the uplink grant,

wherein the position indication information in the uplink grant comprises a transmission format of the uplink grant, the transmission format of the uplink grant comprises a DCI (Downlink Control Information) format of a single-user MIMO (Multiple-Input Multiple-Output) transmission or a DCI format of a multi-user MIMO transmission, and the pilot symbol position determining circuitry is configured to: in the pattern of candidate pilot positions, select two available pilot symbol positions, from the SC-FDMA symbol positions occupied by the uplink sTTI and positions before the SC-FDMA symbol positions occupied by the uplink sTTI, which are closest to the SC-FDMA symbol positions occupied by the uplink sTTI, to serve as the at least one pilot symbol position for the uplink sTTI.

11. The UE according to claim 10 , wherein the first pattern determining circuitry is configured to: read a pattern of pilot symbol positions pre-determined and agreed on with the base station, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.

12. The UE according to claim 10 , wherein the first pattern determining circuitry is configured to: receive a signaling from the base station, wherein the signaling comprises a pattern of pilot symbol positions configured by the base station; and obtain the pattern of pilot symbol positions configured by the base station from the signaling received, to serve as the pattern of candidate pilot symbol positions for the uplink sTTI transmission in the uplink sub-frame.