Method for transmitting control information of transceiving point and said transceiving point, method for receiving control information for terminal and said terminal
Provided are a control information transmission method of a transmission/reception point for a User Equipment that receives downlink control information through a downlink control channel introduced to a data area, a control information reception method of a User Equipment, and apparatuses thereto. Also, a resource mapping method and apparatus for an enhanced Control Channel Element (ECCE) of an EPDCCH is provided.
1. A method for a transmission/reception point to transmit control information to a User Equipment (UE) through a data area of resource block pairs of a subframe where the resource block pairs including physical resource block pairs, the method comprising:
configuring at least one localized downlink control channel set with respect to a few of the resource block pairs where the at least one localized downlink control channel includes an enhanced physical downlink control channel, and configuring at least one distributed downlink control channel set with respect to another few of the resource block pairs;
allocating control channel elements to 4 resource element groups having different indices and having an identical remainder obtained after dividing a corresponding resource element group index by 4 or allocating the control channel elements to 8 resource element groups having different indices and having an identical remainder obtained after dividing a corresponding resource element group index by 2, among resource element groups formed of resource elements having an identical index among resource elements to which 16 numbers are repeatedly assigned as indices on a frequency first basis, in each resource block pair wherein the resource element groups include enhanced resource element groups, resource element groups forming a control channel element in the localized downlink control channel set are located in a single resource block pair, and resource element groups forming a control channel element in the distributed downlink control channel set are located in two or more resource block pairs; and
transmitting, to the User Equipment, control information through at least one of the control channel elements.
2. The method as claimed in claim 1 , wherein the allocating control channel elements comprises:
distributing the resource element groups in the resource block pairs so as to maximize a frequency diversity gain; and
allocating the control channel elements.
3. The method as claimed in claim 1 , wherein the indices of the resource element groups that are allocated to the control channel elements are { 0 , 4 , 8 , 12 }, { 1 , 5 , 9 , 13 }, { 2 , 6 , 10 , 14 }, and { 3 , 7 , 11 , 15 }, respectively.
4. The method as claimed in claim 1 , wherein the indices of the resource element groups that are allocated to the control channel elements are { 0 , 2 , 4 , 6 , 8 , 10 , 12 , 14 } and { 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 }, respectively.
5. A method for a User Equipment (UE) to receive control information from a transmission/reception point through a data area of resource block pairs of a subframe where the resource block pairs include physical resource block pairs, the method comprising:
receiving a wireless signal through at least one of control channel elements that are allocated to 4 resource element groups having different indices and having an identical remainder obtained after dividing a corresponding resource element group index by 4 or that are allocated to 8 resource element groups having different indices and having an identical remainder obtained after dividing a corresponding resource element group index by 2, among resource element groups formed of resource elements having an identical index among resource elements to which 16 numbers are repeatedly assigned as indices on a frequency first basis, in each resource block pair wherein the resource element groups includes enhanced resource element groups, a localized downlink control channel includes enhanced Physical Downlink Control Channel, at least one localized downlink control channel set is configured with respect to a few of the resource block pairs, at least one distributed downlink control channel set is configured with respect to another few of the resource block pairs, resource element groups forming a control channel element in the localized downlink control channel set are located in a single resource block pair, and resource element groups forming a control channel element in the distributed downlink control channel set are located in two or more resource block pairs; and
obtaining the control information from the wireless signal.
6. The method as claimed in claim 5 , wherein the control channel elements are allocated to the distributed downlink control channel set by distributing the resource element groups in the resource block pairs, so as to maximize a frequency diversity gain.
7. The method as claimed in claim 5 , wherein the indices of the resource element groups that are allocated to the control channel elements are { 0 , 4 , 8 , 12 }, { 1 , 5 , 9 , 13 }, { 2 , 6 , 10 , 14 }, and { 3 , 7 , 11 , 15 }, respectively.
8. The method as claimed in claim 5 , wherein the indices of the resource element groups that are allocated to the control channel elements are { 0 , 2 , 4 , 6 , 8 , 10 , 12 , 14 } and { 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 }, respectively.
9. A User Equipment (UE) that receives control information from a transmission/reception point through a data area of resource block pairs of a subframe where the resource block pairs include physical resource block pairs, the User Equipment comprising:
a receiver configured to receive a wireless signal through at least one of control channel elements that are allocated to 4 resource element groups having different indices and having an identical remainder obtained after dividing a corresponding resource element group index by 4 or allocated to 8 resource element groups having different indices and having an identical remainder obtained after dividing a corresponding resource element group index by 2, among resource element groups formed of resource elements having an identical index among resource elements to which 16 numbers are repeatedly assigned as indices on a frequency first basis, in each resource block pair wherein the resource element groups include enhanced resource element groups, a localized downlink control channel includes an enhanced physical downlink control channel, at least one localized downlink control channel set is configured with respect to a few of the resource block pairs, at least one distributed downlink control channel set is configured for another few of the resource block pairs, resource element groups forming a control channel element in the localized downlink control channel set are located in a single resource block pair, and resource element groups forming a control channel element in the distributed downlink control channel set are located in two or more resource block pairs; and
a controller configured to obtain the control information from the wireless signal.
10. The User Equipment as claimed in claim 9 , wherein the control channel elements are allocated to the distributed downlink control channel set after distributing the resource element groups in the resource block pairs, so as to maximize a frequency diversity gain.
11. The method as claimed in claim 9 , wherein the indices of the resource element groups that are allocated to the control channel elements are { 0 , 4 , 8 , 12 }, { 1 , 5 , 9 , 13 }, { 2 , 6 , 10 , 14 }, and { 3 , 7 , 11 , 15 }, respectively.
12. The method as claimed in claim 9 , wherein the indices of the resource element groups that are allocated to the control channel elements are { 0 , 2 , 4 , 6 , 8 , 10 , 12 , 14 } and { 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 }, respectively.