Systems and methods for UE-specific search space and ePDCCH scrambling

Patent metadata

Field	Value
Publication number	US-9055578-B2
Application number	US-201313802132-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	Mar 15, 2012
Publication date	Jun 9, 2015
Grant date	Jun 9, 2015

Abstract

Encoded control information can be mapped to an enhanced physical downlink control channel (ePDCCH) search space of a user equipment (UE) in accordance with an offset and aggregation level. The ePDCCH search space may include a physical resource block (PRB) set located in a data region of a downlink subframe. The encoded control information may be mapped into one or more enhanced control channel elements (eCCEs) of the ePDCCH search space beginning from a starting location. The starting location is an eCCE location within the PRB set. The PRB set, as well as the starting/eCCE location within the PRB set, are identified in accordance with an offset associated with the UE. A number of eCCEs carrying encoded information corresponds to an aggregation level.

First claim

What is claimed is:

1. A method of communicating an enhanced physical downlink control channel (ePDCCH), the method comprising:
determining an offset associated with a user equipment (UE);
determining, in accordance with the offset, an enhanced control channel element (eCCE) location in a physical resource block (PRB) set, the PRB set being included in an ePDCCH search space of the UE;
mapping encoded control information to one or more eCCEs of the ePDCCH search space, the one or more eCCEs starting from the eCCE location in the PRB set, wherein the encoded control information indicates uplink or downlink resources allocated to the UE; and
transmitting, by a communications controller, a subframe carrying the ePDCCH to the UE.

2. The method of claim 1 , wherein the PRB set is located in a data region of the subframe.

3. The method of claim 2 , wherein the PRB set comprises two or more eCCE locations.

4. The method of claim 1 , wherein the ePDCCH search space comprises two or more PRB sets located in a data region of the subframe.

5. The method of claim 1 , wherein determining the offset associated with the UE comprises:
determining the offset in accordance with an identifier (ID) of the UE.

6. The method of claim 1 , further comprising:
communicating parameters for determining the offset to the UE via radio resource control (RRC) signaling.

7. A communications controller comprising:
a processor; and
a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
determine an offset associated with a user equipment (UE);
determine, in accordance with the offset, an enhanced control channel element (eCCE) location in a physical resource block (PRB) set, the PRB set being included in an enhanced physical downlink control channel (ePDCCH) search space of the UE;
map encoded control information to one or more eCCEs of the ePDCCH search space, the one or more eCCEs starting from the eCCE location in the PRB set, wherein the encoded control information indicates uplink or downlink resources allocated to the UE; and
transmit a subframe carrying the ePDCCH to the UE.

8. A method for searching an enhanced physical downlink control channel (ePDCCH) channel, the method comprising:
identifying an offset (Y p,k );
identifying, in accordance with the Y p,k , an enhanced control channel element (eCCE) location in an ePDCCH physical resource block (PRB) set (ePDCCH-PRB-set), the ePDCCH-PRB-set corresponding to an ePDCCH search space of a user equipment (UE); and
locating, by the UE, one or more eCCEs in the ePDCCH-PRB-set, the one or more eCCEs beginning from the eCCE location in the ePDCCH-PRB-set.

9. The method of claim 8 , further comprising:
receiving control signaling over the one or more eCCEs within the ePDCCH search space.

10. A method for receiving control information, the method comprising:
receiving a subframe comprising an enhanced Physical Downlink Control Channel (ePDCCH);
identifying, by a user equipment (UE), an offset;
determining, in accordance with the offset, an enhanced control channel element (eCCE) location in a physical resource block (PRB) set, wherein the PRB set is positioned in an ePDCCH search space of the UE; and
locating, by the UE, one or more eCCEs within the ePDCCH search space, the one or more eCCEs starting from the eCCE location in the PRB set, wherein the one or more eCCEs carry control information for the UE.

11. The method of claim 10 , wherein the determining the eCCE location in the PRB set comprises:
determining an aggregation level, wherein the aggregation level corresponds to a number of eCCEs in the one or more eCCEs.

12. The method of claim 10 , wherein the PRB set is located in a data region of the subframe.

13. The method of claim 12 , wherein the PRB set comprises two or more eCCE locations.

14. The method of claim 10 , wherein the ePDCCH search space comprises two or more PRB sets located in a data region of the subframe.

15. The method of claim 10 , wherein the one or more eCCEs indicate uplink or downlink resources assigned to the UE.

16. The method of claim 10 , wherein identifying the offset comprises:
receiving, by the UE, parameters for determining the offset from a base station via radio resource control signaling (RRC); and
determining the offset in accordance with the parameters.

17. The method of claim 10 , wherein identifying the offset comprises:
determining, by the UE, an offset indicator in accordance with an identifier (ID) associated with the UE.

18. A user equipment (UE) for receiving control information, the UE comprising:
a processor; and
a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
receive a subframe comprising an enhanced Physical Downlink Control Channel (ePDCCH);
identify an offset;
determine, in accordance with the offset, an enhanced control channel element (eCCE) location in a physical resource block (PRB) set, wherein the PRB set is positioned in an ePDCCH search space of the UE; and
locate one or more eCCEs within the ePDCCH search space, the one or more eCCEs starting from the eCCE location in the PRB set.

Assignees

• Futurewei Technologies Inc

Inventors

• Sartori Philippe
• Desai Vipul
• Classon Brian

Classifications

• H04W72/23 Primary

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

• H04L5/0053 Primary

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

• H04W72/042 Primary

  Electricity · mapped topic

• H04W72/044

  based on the type of the allocated resource · CPC title