TRANSMISSION AND RECEPTION OF CONTROL INFORMATION

• US 20140078987A1
• Filed: 09/16/2013
• Published: 03/20/2014
• Est. Priority Date: 09/18/2012
• Status: Active Grant

• Current Assignee: Google Inc. (Alphabet Inc.)
• Original Assignee: KT Corporation
• Inventors: PARK, Kyu Jin, CHOI, Woo-Jin
• Granted Patent: US 9,398,577 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The disclosure is related to transmitting control information in a transmission/reception point and to receiving the control information in user equipment. Particularly, the present disclosure relates to transmitting the control information for user equipment which receives downlink control information through a downlink control channel newly defined in a data region. Furthermore, the present disclosure relates to performing a resource mapping for enhanced control channel elements (ECCEs) of an enhanced physical downlink control channel (EPDCCH).

Claims

1. A method of transmitting control information to user equipment through data regions of two or more physical resource-block (PRB) pairs in a subframe, in a transmission/reception point, the method comprising:

forming enhanced control channel elements (ECCEs), wherein (i) resource elements (REs) in each of the two or more PRB pairs are indexed by repetitively using 16 numbers according to a frequency-first scheme, (ii) resource elements (REs) having an identical index are included in an identical enhanced resource-element group (EREG), (iii) each of the ECCEs includes 4 or 8 EREGs corresponding to different EREG indices having an identical remainder when the different EREG indices are divided by one of 4 and 2, and (iv) the EREGs included in each of the ECCEs are located in the two or more PRB pairs; and

transmitting the control information to the user equipment through at least one of the ECCEs.

2. The method of claim 1, wherein the forming the ECCEs includes:

forming the ECCEs by distributing the EREGs to the two or more PRB pairs such that a frequency diversity gain is within a relative maximum level.

3. The method of claim 1, wherein the two or more PRB pairs are included in one enhanced physical downlink control channel (EPDCCH) set formed according to a distributed type scheme.

4. The method of claim 1, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 4, 8, 12}, {1, 5, 9, 13}, {2, 6, 10, 14}, and {3, 7, 11, 15}.

5. The method of claim 1, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 2, 4, 6, 8, 10, 12, 14} and {1, 3, 5, 7, 9, 11, 13, 15}.

6. A method of receiving control information from a transmission/reception point through data regions of two or more physical resource-block (PRB) pairs in a subframe, in user equipment, the method comprising:

receiving a wireless signal through at least one enhanced control channel element (ECCE), wherein (i) resource elements (REs) in each of the two or more PRB pairs are indexed by repetitively using 16 numbers according to a frequency-first scheme, (ii) resource elements (REs) having an identical index are included in an identical enhanced resource-element group (EREG), (iii) each of ECCEs includes 4 or 8 EREGs corresponding to different EREG indices having an identical remainder when the different EREG indices are divided by one of 4 and 2, and (iv) the EREGs included in each of the ECCEs are located in the two or more PRB pairs; and

obtaining the control information from the received wireless signal.

7. The method of claim 6, wherein the ECCEs are formed by distributing the EREGs to the two or more PRB pairs such that a frequency diversity gain is within a relative maximum level.

8. The method of claim 6, wherein the two or more PRB pairs are included in one enhanced physical downlink control channel (EPDCCH) set formed according to a distributed type scheme.

9. The method of claim 6, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 4, 8, 12}, {1, 5, 9, 13}, {2, 6, 10, 14}, and {3, 7, 11, 15}.

10. The method of claim 6, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 2, 4, 6, 8, 10, 12, 14} and {1, 3, 5, 7, 9, 11, 13, 15}.

11. A transmission/reception point for transmitting control information to user equipment through data regions of two or more physical resource-block (PRB) pairs in a subframe, the transmission/reception point comprising:

a control processor configured to form enhanced control channel elements (ECCEs), wherein (i) resource elements (REs) in each of the two or more PRB pairs are indexed by repetitively using 16 numbers according to a frequency-first scheme, (ii) resource elements (REs) having an identical index are included in an identical enhanced resource-element group (EREG), (iii) each of the ECCEs includes 4 or 8 EREGs corresponding to different EREG indices having an identical remainder when the different EREG indices are divided by one of 4 and 2, and (iv) the EREGs included in each of the ECCEs are located in the two or more PRB pairs; and

a transmitter configured to transmit the control information to the user equipment through at least one of the ECCEs.

12. The transmission/reception point of claim 11, wherein the control processor is configured to form the ECCEs by distributing the EREGs to the two or more PRB pairs such that a frequency diversity gain is within a relative maximum level.

13. The transmission/reception point of claim 11, wherein the two or more PRB pairs are included in one enhanced physical downlink control channel (EPDCCH) set formed according to a distributed type scheme.

14. The transmission/reception point of claim 11, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 4, 8, 12}, {1, 5, 9, 13}, {2, 6, 10, 14}, and {3, 7, 11, 15}.

15. The transmission/reception point of claim 11, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 2, 4, 6, 8, 10, 12, 14} and {1, 3, 5, 7, 9, 11, 13, 15}.

16. A user equipment receiving control information from a transmission/reception point through data regions of two or more physical resource-block (PRB) pairs in a subframe, the user equipment comprising:

a receiver configured to receive a wireless signal through at least one enhanced control channel element (ECCE), wherein (i) resource elements (REs) in each of the two or more PRB pair are indexed by repetitively using 16 numbers according to a frequency-first scheme, (ii) resource elements (REs) having an identical index are included in an identical enhanced resource-element group (EREG), (iii) each of ECCEs includes 4 or 8 EREGs corresponding to different EREG indices having an identical remainder when the different EREG indices are divided by one of 4 and 2, and (iv) the EREGs included in each of the ECCEs are located in the two or more PRB pairs; and

a control processor configured to obtain the control information from the received wireless signal.

17. The user equipment of claim 16, wherein the ECCEs are formed by distributing the EREGs to the two or more PRB pairs such that a frequency diversity gain is within a relative maximum level.

18. The user equipment of claim 16, wherein the two or more PRB pairs are included in one enhanced physical downlink control channel (EPDCCH) set formed according to a distributed type scheme.

19. The user equipment of claim 16, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 4, 8, 12}, {1, 5, 9, 13}, {2, 6, 10, 14}, and {3, 7, 11, 15}.

20. The user equipment of claim 16, wherein an EREG index group corresponding to each of the ECCEs is selected as one of {0, 2, 4, 6, 8, 10, 12, 14} and {1, 3, 5, 7, 9, 11, 13, 15}.