Method, system and apparatus for information transmission
View Patent ↗Embodiments of this application relate to the field of wireless communications and particularly to a method of and system and apparatus for transmitting information so as to transmit DCI over E-PDCCHs. A method according to an embodiment of the invention includes: the network side selecting candidate E-PDCCHs for carrying DCI from a set of candidate E-PDCCHs, wherein the set of candidate E-PDCCHs includes E-PDCCHs occupying a plurality of time-frequency resources consecutive in frequency domain and E-PDCCHs occupying a plurality of time-frequency resources inconsecutive in frequency domain; and the network side transmitting the DCI over the selected candidate E-PDCCHs. With the method according to the embodiment of the invention, DCI can be transmitted over E-PDCCHs to thereby enable effectively the E-PDCCHs to occupy both the resources consecutive in frequency domain and the resources inconsecutive in frequency domain and improve the transmission efficiency and the system performance.
1. A method of transmitting information, the method comprising:
selecting, by a network side, candidate Enhanced-Physical Downlink Control Channels (E-PDCCHs) for carrying Downlink Control Information (DCI) from a set of candidate E-PDCCHs, wherein the set of candidate E-PDCCHs includes E-PDCCHs occupying a plurality of time-frequency resources consecutive in frequency domain and E-PDCCHs occupying a plurality of time-frequency resources inconsecutive in frequency domain;
wherein selecting, by the network side, the candidate E-PDCCHs for carrying the DCI comprises:
selecting, by the network side, the candidate E-PDCCHs for carrying the DCI from the set of candidate E-PDCCHs according to at least one aggregation level at which the DCI is to be transmitted, wherein each aggregation level corresponds to a respective number of time-frequency resources occupied by a respective candidate E-PDCCH, and wherein each time-frequency resource is an Enhanced-Control Channel Element (E-CCE) comprising Resource Elements (REs);
wherein the size of time-frequency resources occupied at each aggregation level are configured flexibly;
wherein before the network side transmits the DCI, the method further comprises:
determining, by the network side, the size of time-frequency resources occupied at each aggregation level according to a resource configuration or a carrier configuration or higher-layer instruction information;
transmitting, by the network side, the DCI over the selected candidate E-PDCCHs.
2. The method according to claim 1 , wherein the plurality of time-frequency resources consecutive in frequency domain occupy at least one E-PDCCH cluster; and
the plurality of time-frequency resources inconsecutive in frequency domain occupy a plurality of E-PDCCH clusters.
3. The method according to claim 1 , wherein selecting, by the network side, the candidate E-PDCCHs for carrying the DCI comprises:
selecting, by the network side, the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain from the set of candidate E-PDCCHs as the candidate E-PDCCHs for carrying the DCI if the aggregation level of the DCI to be transmitted is 1 or 2; and
selecting, by the network side, the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain from the set of candidate E-PDCCHs as the candidate E-PDCCHs for carrying the DCI if the aggregation level of the DCI to be transmitted is 4 or 8.
4. The method according to claim 1 , wherein selecting, by the network side, the candidate E-PDCCHs for carrying the DCI comprises:
selecting, by the network side, the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain from the set of candidate E-PDCCHs as the candidate E-PDCCHs for carrying the DCI if the aggregation level of the DCI to be transmitted is 1;
selecting, by the network side, the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain from the set of candidate E-PDCCHs as the candidate E-PDCCHs for carrying the DCI if the aggregation level of the DCI to be transmitted is 4 or 8; and
selecting, by the network side, the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain and/or the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain from the set of candidate E-PDCCHs as the candidate E-PDCCHs for carrying the DCI if the aggregation level of the DCI to be transmitted is 2.
5. A method of transmitting information, the method comprising:
determining, by a user equipment, a set of candidate Enhanced-Physical Downlink Control Channels (E-PDCCHs) for carrying Downlink Control Information (DCI), wherein the set of candidate E-PDCCHs includes E-PDCCHs occupying a plurality of time-frequency resources consecutive in frequency domain and E-PDCCHs occupying a plurality of time-frequency resources inconsecutive in frequency domain;
wherein the size of time-frequency resources occupied at each of different aggregation levels are configured flexibly, wherein each aggregation level corresponds to a respective number of time-frequency resources occupied by a respective candidate E-PDCCH, and wherein each time-frequency resource is an Enhanced-Control Channel Element (E-CCE) comprising Resource Elements (REs);
wherein before the user equipment performs blind detection, the method further comprises:
determining, by the user equipment, the size of time-frequency resources occupied at each aggregation level according to a resource configuration or a carrier configuration or higher-layer instruction information; and
performing, by the user equipment, blind detection on all the candidate E-PDCCHs in the set of candidate E-PDCCHs for each of the different aggregation levels;
wherein performing, by the user equipment, blind detection comprises:
performing, by the user equipment, blind detection on all the candidate E-PDCCHs in the set of candidate E-PDCCHs to receive DCI.
6. The method according to claim 5 , wherein the plurality of time-frequency resources consecutive in frequency domain occupy at least one E-PDCCH cluster; and
the plurality of time-frequency resources inconsecutive in frequency domain occupy a plurality of E-PDCCH clusters.
7. The method according to claim 5 , wherein performing, by the user equipment, blind detection comprises:
performing, by the user equipment, blind detection on the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain at the aggregation level 1 or 2; and
performing, by the user equipment, blind detection on the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain at the aggregation level 4 or 8.
8. The method according to claim 5 , wherein performing, by the user equipment, blind detection comprises:
performing, by the user equipment, blind detection on the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain at the aggregation level 1;
performing, by the user equipment, blind detection on the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain at the aggregation level 4 or 8; and
performing, by the user equipment, blind detection on the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain and/or the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain at the aggregation level 2.
9. A user equipment for transmitting information, the user equipment comprising:
a determination module configured to determine a set of candidate Enhanced-Physical Downlink Control Channels (E-PDCCHs) for carrying Downlink Control Information (DCI), wherein the set of candidate E-PDCCHs includes E-PDCCHs occupying a plurality of time-frequency resources consecutive in frequency domain and E-PDCCHs occupying a plurality of time-frequency resources inconsecutive in frequency domain;
wherein the size of time-frequency resources occupied at each of different aggregation levels are configured flexibly, wherein each aggregation level corresponds to a respective number of time-frequency resources occupied by a respective candidate E-PDCCH, and wherein each time-frequency resource is an Enhanced-Control Channel Element (E-CCE) comprising Resource Elements (REs);
a blind detection module configured:
to determine the size of time-frequency resources occupied at each aggregation level according to a resource configuration or a carrier configuration or higher-layer instruction information;
the blind detection module is further configured:
to perform blind detection on all the candidate E-PDCCHs in the set of candidate E-PDCCHs for each of the different aggregation levels; and
to perform blind detection on all the candidate E-PDCCHs in the set of candidate E-PDCCHs to receive DCI.
10. The user equipment according to claim 9 , wherein the blind detection module is further configured:
to perform blind detection on the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain at the aggregation level 1 or 2; and
to perform blind detection on the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain at the aggregation level 4 or 8.
11. The user equipment according to claim 9 , wherein the blind detection module is further configured:
to perform blind detection on the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain at the aggregation level 1;
to perform blind detection on the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain at the aggregation level 4 or 8; and
to perform blind detection on the E-PDCCHs occupying the plurality of time-frequency resources consecutive in frequency domain and/or the E-PDCCHs occupying the plurality of time-frequency resources inconsecutive in frequency domain at the aggregation level 2.