Method and apparatus for transmitting and receiving data in a wireless communication system

Patent metadata

Field	Value
Publication number	US-9591632-B2
Application number	US-201314440623-A
Country	US
Kind code	B2
Filing date	Nov 6, 2013
Priority date	Nov 6, 2012
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A method for and apparatus for transmitting and receiving data in a wireless communication system supporting multiple carriers is provided. A wireless device determines a starting OFDM symbol of a physical downlink shared chancel (PDSCH) which is variably located by presence of reference signal (RS), a number of physical resource block (PRB)s used for an enhanced physical downlink control channel (ePDCCH), and receives the ePDCCH. The ePDCCH is set by one or more sets of PRBs within the PDSCH configured for a UE to monitor the ePDCCH. Thus, more efficient and accurate scheduling with lower complexity and reduction of control overhead of a master cell (as PCell), for multi-UEs and variable control information transmissions are supported in this invention.

First claim

The invention claimed is:

1. A method for transmitting and receiving data in a wireless communication system supporting multiple carriers, performed by a wireless device, the method comprising:
determining a starting OFDM symbol of a physical downlink shared channel (PDSCH) which is variably located by the presence of a reference signal (RS);
determining a number of physical resource blocks (PRBs) used for an enhanced physical downlink control channel (ePDCCH); and
determining the ePDCCH;
wherein the ePDCCH is set by one or more sets of PRBs within the PDSCH configured for a User Equipment (UE) to monitor the ePDCCH.

2. The method of claim 1 , wherein determining the number of PRBs further comprises determining:
a number of PRBs used for the ePDCCH which is allocated with PDSCH PRBs of a resource allocation by Downlink Control Information (DCI),
a number of PRBs overlapped between the PDSCH PRBs and the ePDCCH PRBs by the DCI, or
a number of PRBs between the PDSCH PRBs and the ePDCCH PRBs are localized or distributed.

3. The method of claim 2 , further comprising:
determining one or more sets of ePDCCHs by indicating validation/activation of the DCI via a physical downlink control channel (PDCCH) or the ePDCCH, or determining the one or more sets of ePDCCHs by signaling from a higher-layer signal.

4. The method of claim 2 , wherein determining the number of PRBs further comprises:
determining whether at least one of a scheduling DCI or PDSCH is transmitted from different transmission points,
determining whether a PDSCH is rate matched or not rate matched according to the scheduling DCI, and
determining an ePDCCH sets using a PQI (PDSCH RE mapping and Qausi-co-located Indicator) index associated with the ePDCCH sets, or a linked CRS or discovery signal in each of the PQI.

5. The method of claim 1 , wherein determining the ePDCCH further comprises:
determining one or more sets of ePDCCHs by a PQI (PDSCH RE mapping and Qausi-collocated Indicator) index.

6. The method of claim 5 , wherein the PQI is indicated by a PQI field in a DCI format 2D or the PQI is indicated by a RRC signal configured for DCI format 1A.

7. The method of claim 5 , wherein determining the ePDCCH further comprises:
determining the one or more sets of ePDCCHs by a Cell specific RS (CRS), wherein the CRS includes a channel state information (CSI) RS assigned with a linked cell identification (ID) of transmission point.

8. The method of claim 1 , wherein the starting OFDM symbol of the PDSCH is variably set at the 0th OFDM symbol or the 3rd OFDM symbol by the presence of a Cell specific RS (CRS).

9. The method of claim 1 , wherein determining the ePDCCH further comprises:
determining one or more sets of ePDCCHs which are indicated with different DCI formats according to a transmission mode of the UE.

10. The method of claim 1 , determining the ePDCCH further comprises:
determining the one or more sets of ePDCCHs by assuming that a tracking RS, a Demodulation reference signal (DM-RS), and a CSI-RS are Quasi-collocated (QCL).

11. A wireless device for transmitting and receiving data in a wireless communication system supporting multiple carriers, comprising:
a radio frequency unit that receives a radio signal; and
a processor, operatively coupled with the radio frequency unit, that:
determines a starting OFDM symbol of a physical downlink shared channel (PDSCH) which is variably located by the presence of a reference signal (RS),
determines a number of physical resource blocks (PRBs) used for an enhanced physical downlink control channel (ePDCCH), and
determines the ePDCCH,
wherein the ePDCCH is set by one or more set of PRBs within the PDSCH configured for a User Equipment (UE) to monitor the ePDCCH.

12. The wireless device of claim 11 , wherein the processor further determines:
a number of PRBs used for the ePDCCH which is allocated with PDSCH PRBs of a resource allocation by a Downlink Control Information (DCI),
a number of PRBs overlapped between the PDSCH PRBs and the ePDCCH PRBs by the DCI, or
a number of PRBs between the PDSCH PRBs and the ePDCCH PRBs are localized or distributed.

13. The wireless device of claim 11 , wherein the processor further: determines one or more sets of ePDCCHs by indicating validation/activation of the DCI via a physical downlink control channel (PDCCH) or the ePDCCH, or by signaling from a higher-layer signal as a Semi-persistent Scheduling (SPS).

14. The wireless device of claim 11 , wherein the processor is configured to: determine one or more sets of ePDCCHs by a PQI (PDSCH RE mapping and Qausi-collocated Indicator) index, wherein the PQI is indicated by a PQI field in a DCI format 2D or the PQI is indicated by a RRC signal configured for DCI format 1A.

15. The wireless device of claim 11 , wherein the processor further: determines one or more sets of ePDCCHs by a Cell specific RS (CRS), wherein the CRS includes a channel state information (CSI) RS assigned with a linked cell identification (ID) of transmission point, and the starting OFDM symbol of the PDSCH is variably set at the 0th OFDM symbol or the 3rd OFDM symbol by the presence of the CRS.

16. The wireless device of claim 11 , wherein the processor further: determines one or more sets of ePDCCHs which is indicated with different DCI formats according to a transmission mode of the UE.

17. A method for transmitting and receiving data in a wireless communication system supporting multiple carriers, performed by a wireless device, the method comprising:
receiving a signal including a common search space (CSS) and UE specific search space (USS) for an enhanced physical downlink control channel (ePDCCH),
determining cyclic prefix(CP) lengths for the CSS and the USS for the ePDCCH respectively, and
determining the ePDCCH using the determined CP lengths,
wherein a UE is configured with the same CP length for a commonly used CSS and USS for the ePDCCH or the UE is configured with separate CP lengths for a separately used CSS and USS for the ePDCCH.

Assignees

• Lg Electronics Inc

Inventors

• Yi Yunjung
• Seo Hanbyul

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/001 Primary

  the frequencies being arranged in component carriers · CPC title

• H04L1/0072

  Error control for data other than payload data, e.g. control data · CPC title

• H04L1/0046

  Code rate detection or code type detection (H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091) · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title