Method and device for determining ePDCCH resources

• US 9,426,799 B2
• Filed: 03/07/2013
• Issued: 08/23/2016
• Est. Priority Date: 03/19/2012
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Tamrakar, Rakesh, Pan, Xueming, Zhao, Rui, Zhang, Ranran
• Primary Examiner(s): CATTUNGAL, AJAY P
• Application Number:
  US14/383,319
• Publication Number:
  US 20150016386A1
• Time in Patent Office: 1,265 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present disclosure provides a method and an apparatus for determining number of ePDCCH resource units. The method includes: determining number of symbols occupied by PDCCH, number of CRS ports, number of DMRS ports and CSI-RS configuration in a subframe; and determining resources available for transmitting an ePDCCH in PDSCH area of the subframe according to the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration.

Claims

1. A method for determining enhanced physical downlink control channel (ePDCCH) resources, comprising:

determining number of symbols occupied by a physical downlink control channel (PDCCH), number of common reference signal (CRS) ports, number of demodulation reference signal (DMRS) ports and channel state information-reference signal (CSI-RS) configuration in a subframe; and

determining resources available for transmitting an ePDCCH in a physical downlink shared channel (PDSCH) area of the subframe according to the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration.

2. The method of claim 1, wherein the determining resources available for transmitting the ePDCCH in a PDSCH area of the subframe according to the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration comprises:

determining number of resource elements (REs) available for transmitting the ePDCCH in the PDSCH area of the subframe according to the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration; and

determining number of resource units occupied by the ePDCCH in the subframe according to the number of REs.

3. The method of claim 2, wherein for the number of REs available for transmitting the ePDCCH in the subframe under each configuration, the number of resource units occupied by the ePDCCH in the subframe is defined in system information;

determining the number of resource units occupied by the ePDCCH in the subframe according to the number of REs comprises;

determining the number of resource units occupied by the ePDCCH in the subframe corresponding to the number of REs according to the system information and the number of REs.

4. The method of claim 3, wherein an enhanced control channel element (eCCE) is the resource unit of the ePDCCH, the system information further comprises number of REs in the eCCE defined according to a resource mapping manner;

for the number of REs available for transmitting the ePDCCH in the subframe under each configuration, defining the number of resource units occupied by the ePDCCH in the subframe comprises;

according to the number of REs available for transmitting the ePDCCH in the subframe under each configuration, defining corresponding number of eCCEs;

for subframes with different configurations, the eCCE comprises the same or different number of REs, wherein the configuration comprises the number of symbols occupied by the ePDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration;

wherein in the subframe, the eCCE comprises the same or different number of REs according to the resource mapping manner.

5. The method of claim 3, wherein an enhanced resource element group (eREG) is the resource unit of the ePDCCH;

for the number of REs available for transmitting the ePDCCH in the subframe under each configuration, determining the number of resource units occupied by the ePDCCH in the subframe comprises;

for subframes under different configurations, the eREG comprises the same number of REs, wherein the configuration comprises the number of symbols occupied by the ePDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration.

6. The method of claim 5, wherein for the number of REs available for transmitting the ePDCCH in the subframe under each configuration in the system information, the number of eREGs is determined according to the resource mapping manner;

for the same number of REs, the same or different number of eREGs is obtained according to different resource mapping manners.

7. The method of claim 3, wherein a resource block obtained via average division is the resource unit of the ePDCCH, the system information further comprises a requirement on the number of REs comprised in the resource block;

determining the number of resource units occupied by the ePDCCH in the subframe corresponding to the number of REs according to the system information and the number of REs comprises;

determining a resource division manner of physical resource blocks (PRBs) in the subframe corresponding to the number of REs according to the system information and the number of REs, wherein the number of REs comprised in each resource block obtained according to the determined resource division manner meets the requirement on the number of REs comprised in the resource block defined in the system information.

8. An apparatus for determining enhanced physical downlink control channel (ePDCCH) resources, comprising:

a first determining unit, to determine number of symbols occupied by a physical downlink control channel (PDCCH), number of common reference signal (CRS) ports, number of demodulation reference signal (DMRS) ports and a channel state information-reference signal (CSI-RS) configuration in a subframe; and

a second determining unit, to determine resources available for transmitting an ePDCCH in a physical downlink shared channel (PDSCH) area of the subframe according to the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration.

9. The apparatus of claim 8, further comprising wherein

the second determining unit is further to determine number of resource elements (REs) available for transmitting the ePDCCH in the PDSCH area of the subframe according to the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration;

and

determine the number of resource units occupied by the ePDCCH in the subframe according to the number of REs.

10. The apparatus of claim 9, wherein for the number of REs available for transmitting the ePDCCH in the subframe under each configuration, the number of resource units occupied by the ePDCCH in the subframe is defined in system information;

the second determining unit is further to determine the number of resource units occupied by the ePDCCH in the subframe corresponding to the number of the REs according to the system information.

11. The apparatus of claim 10, wherein an enhanced control channel element (eCCE) is the resource unit of the ePDCCH, the system information further comprises the number of REs comprised in the eCCE with respect to each resource mapping manner;

for the number of REs available for transmitting the ePDCCH in the subframe under each configuration, the number of eCCEs is defined;

for subframes under different configurations, the eCCE comprises the same or different number of REs;

wherein the configuration comprises the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration;

with respect to different resource mapping manners, the eCCE comprises the same or different number of REs in one subframe.

12. The apparatus of claim 10, wherein an enhanced resource element group (eREG) is the resource unit of the ePDCCH;

for subframes under different configurations, the eREG comprises the same number of REs, wherein the configuration comprises the number of symbols occupied by the ePDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration.

13. The apparatus of claim 12, wherein for the number of REs available for transmitting the ePDCCH in the subframe under each configuration comprised in the system information, the number of eREGs is determined according to a resource mapping manner;

for the same number of REs, the same or different number of eREGs is obtained according to different resource mapping manners.

14. The apparatus of claim 10, wherein a resource block obtained via average division is the resource unit of the ePDCCH, the system information further comprises a requirement on the number of REs comprised in the resource block;

the second determining unit is further to determine a resource division manner of physical resource blocks (PRBs) in the subframe corresponding to the number of REs according to the system information and the number of REs, wherein the number of REs comprised in each resource block obtained according to the determined resource mapping manner meets the requirement on the number of REs comprised in the resource block defined in the system information.