Transmission and reception of control information
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).
1. A method of transmitting control information to user equipment through a data region of a physical resource-block (PRB) pair in a subframe, in a transmission/reception point, the method comprising:
forming enhanced control channel elements (ECCEs), wherein (i) resource elements (REs) in the 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), and (iii) each of the ECCEs includes EREGs corresponding to EREG indices having an identical remainder when the EREG indices are divided by N, where the N is one of 4 and 2; and
transmitting the control information to the user equipment through at least one of the ECCEs.
2. The method of claim 1 , wherein the PRB pair along with at least one other PRB pair is used to configure one enhanced physical downlink control channel (EPDCCH) set according to a localized type scheme.
3. The method of claim 2 , wherein the ECCEs are indexed from a first ECCE of a lowest PRB pair of the EPDCCH set to an N-th ECCE of a largest PRB pair of the EPDCCH set.
4. The method of claim 1 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 4)=0}, {n|(n mod 4)=1}, {n|(n mod 4)=2}, and {n|(n mod 4)=3}, where the n is an EREG index.
5. The method of claim 1 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 2)=0} and {n|(n mod 2)=1}, where the n is an EREG index.
6. A method of receiving control information from a transmission/reception point through a data region of a physical resource-block (PRB) pair 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 the 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), and (iii) each of ECCEs includes EREGs corresponding to EREG indices having an identical remainder when the EREG indices are divided by N, where the N is one of 4 and 2; and
obtaining the control information from the received wireless signal.
7. The method of claim 6 , wherein the PRB pair along with at least one other PRB pair is used to configure one enhanced physical downlink control channel (EPDCCH) set according to a localized type scheme.
8. The method of claim 7 , wherein the ECCEs are indexed from a first ECCE of a lowest PRB pair of the EPDCCH set to an N-th ECCE of a largest PRB pair of the EPDCCH set.
9. The method of claim 6 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 4)=0}, {n|(n mod 4)=1}, {n|(n mod 4)=2}, and {n|(n mod 4)=3}, where the n is an EREG index.
10. The method of claim 6 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 2)=0} and {n|(n mod 2)=1}, where the n is an EREG index.
11. A transmission/reception point for transmitting control information to user equipment through a data region of a physical resource-block (PRB) pair 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 the 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), and (iii) each of the ECCEs includes EREGs corresponding to EREG indices having an identical remainder when the EREG indices are divided by N, where the N is one of 4 and 2; 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 PRB pair along with at least one other PRB pair is used to configure one enhanced physical downlink control channel (EPDCCH) set according to a localized type scheme.
13. The transmission/reception point of claim 12 , wherein the ECCEs are indexed from a first ECCE of a lowest PRB pair of the EPDCCH set to an N-th ECCE of a largest PRB pair of the EPDCCH set.
14. The transmission/reception point of claim 11 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 4)=0}, {n|(n mod 4)=1}, {n|(n mod 4)=2}, and {n|(n mod 4)=3}, where the n is an EREG index.
15. The transmission/reception point of claim 11 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 2)=0} and {n|(n mod 2)=1}, where the n is an EREG index.
16. A user equipment receiving control information from a transmission/reception point through a data region of a physical resource-block (PRB) pair 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 the 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), and (iii) each of ECCEs includes EREGs corresponding to EREG indices having an identical remainder when the EREG indices are divided by N, where the N is one of 4 and 2; and
a control processor configured to obtain the control information from the received wireless signal.
17. The user equipment of claim 16 , wherein the PRB pair along with at least one other PRB pair is used to configure one enhanced physical downlink control channel (EPDCCH) set according to a localized type scheme.
18. The user equipment of claim 17 , wherein the ECCEs are indexed from a first ECCE of a lowest PRB pair of the EPDCCH set to an N-th ECCE of a largest PRB pair of the EPDCCH set.
19. The user equipment of claim 16 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 4)=0}, {n|(n mod 4)=1}, {n|(n mod 4)=2}, and {n|(n mod 4)=3}, where the n is an EREG index.
20. The user equipment of claim 16 , wherein an EREG index group corresponding to the each of the ECCEs is selected as one of {n|(n mod 2)=0} and {n|(n mod 2)=1}, where the n is an EREG index.