Method and device for transmitting control information

• US 9,893,860 B2
• Filed: 07/03/2012
• Issued: 02/13/2018
• Est. Priority Date: 11/07/2011
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Pan, Xueming, Shen, Zukang, Zhao, Rui
• Primary Examiner(s): PHAN, MAN U
• Application Number:
  US14/356,592
• Publication Number:
  US 20150295688A1
• Time in Patent Office: 2,051 Days
• Field of Search: 370241-280, 370311-341, 455410-522
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0667 of delayed versions of same signal using space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04B 7/12 Frequency diversity
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0041 Frequency-non-contiguous
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

Disclosed are a method and device for transmitting control information, to provide a control information sending manner based on a diversity transmission mode. The method for transmitting control information includes: determining the transmission of a plurality of enhanced control channel units (E-CCE) of an enhanced physical downlink control channel (E-PDCCH), each E-CCE containing the same number of enhanced resource unit groups (E-REGs), and a plurality of E-REGs contained in each E-CCE respectively belonging to a different frequency resource block (RB); and bearing each piece of downlink control information (DCI) to be transmitted over the E-PDCCH into at least one E-CCE for transmission. It is realized that each portion of one piece of DCI is respectively borne onto a plurality of frequency bands corresponding to the E-PDCCH for transmission, improving the stability and reliability of DCI transmission.

Claims

1. A method for transmitting control information, comprising:

determining a plurality of enhanced control channel elements, E-CCEs, for transmitting an enhanced physical downlink control channel, E-PDCCH, wherein each E-CCE comprises a same number of enhanced resource element groups, E-REGs, and each of a plurality of E-REGs comprised in one E-CCE belongs to one of a plurality of frequency resource blocks, RBs, respectively, and the plurality of frequency RBs to which the plurality of E-REGs belong are different from each other; and

bearing each downlink control information, DCI, to be transmitted over the E-PDCCH into at least one E-CCE for transmission;

wherein determining the plurality of E-CCEs for transmitting the E-PDCCH comprises;

determining the plurality of frequency RBs for transmitting the E-PDCCH,

determining one or more E-REGs corresponding to each RB, and

aggregating all the determined E-REGs into the plurality of E-CCEs.

2. The method of claim 1, wherein the frequency RBs are allocated to a UE by a base station and discretely distributed in a system bandwidth.

3. The method of claim 2, wherein determining the E-REGs corresponding to the RB comprises:

determining all available resource elements, REs, in one physical resource area block of the RB as an E-REG, wherein the available REs are all REs except REs for transmitting a legacy PDCCH and reference signals in the physical resource area block;

and wherein the physical resource area block occupies all Orthogonal Frequency Division Multiplexing, OFDM, symbols except OFDM symbols occupied by the legacy PDCCH in one physical resource block pair, PRB pair, in a time domain, and occupies all subcarriers of the RB in a frequency domain;

or

the physical resource area block occupies all OFDM symbols except OFDM symbols occupied by the legacy PDCCH in one PRB in the time domain, and occupies all subcarriers of the RB in the frequency domain;

or

the physical resource area block occupies all OFDM symbols except the OFDM symbols occupied by the legacy PDCCH in one PRB pair in the time domain, and occupies one subcarrier or a plurality of continuous subcarriers of the RB in the frequency domain;

or

the physical resource area block occupies all OFDM symbols except the OFDM symbols occupied by the legacy PDCCH in one PRB in the time domain, and occupies one subcarrier or a plurality of continuous subcarriers of the RB in the frequency domain.

4. The method of claim 1, wherein bearing each DCI to be transmitted over the E-PDCCH into at least one E-CCE comprises:

for the DCI, determining a number of the E-CCEs for bearing the DCI according to an encoding rate required by the DCI; and

selecting the corresponding number of E-CCEs from the plurality of E-CCEs, and bearing the DCI into the selected E-CCEs.

5. The method of claim 1, wherein bearing each DCI to be transmitted over the E-PDCCH into at least one E-CCE comprises:

cascading modulation symbols of all DCI to be transmitted, and dividing the cascaded modulation symbol sequence into a plurality of sub-blocks, SBs, wherein each SB comprises a same number of modulation symbols;

sequencing all E-REGs corresponding to the plurality of E-CCEs from low frequency to high frequency, and interleaving all the sequenced E-REGs to form an interleaved E-REG sequence; and

sequentially mapping all the cascaded SBs into the interleaved E-REG sequence, wherein each of a plurality of E-REGs corresponding to a plurality of SBs of the same DCI belongs to a different RB, respectively.

6. The method of claim 1, wherein bearing each DCI to be transmitted over the E-PDCCH into one or more E-CCEs comprises:

sequencing all E-REGs corresponding to the plurality of E-CCEs from low frequency to high frequency to obtain an E-REG sequence; and

cascading modulation symbols of all DCI to be transmitted, and dividing the cascaded modulation symbol sequence into a plurality of SBs, wherein each SB comprises a same number of modulation symbols; and

interleaving the plurality of SBs to obtain an SB sequence, and successively mapping the SB sequence into the sequenced E-REG sequence, wherein each of a plurality of E-REGs corresponding to a plurality of SBs of the same DCI belongs to a different RB, respectively.

7. The method of claim 5, wherein a manner of interleaving the sequenced E-REG sequence or the SB sequence is determined according to a number of a current subframe or an ID of a current cell.

16. The method of claim 6, wherein a manner of interleaving the sequenced E-REG sequence or the SB sequence is determined according to a number of a current subframe or an ID of a current cell.

8. A method for receiving control information, comprising:

receiving at least one DCI to be transmitted over an enhanced physical downlink control channel, E-PDCCH, in a plurality of enhanced control channel elements, E-CCEs, for transmitting the E-PDCCH, wherein each DCI is borne in at least one E-CCE, each E-CCE comprises a same number of enhanced resource element groups, E-REGs, and each of a plurality of E-REGs comprised in one E-CCE belongs to a plurality of frequency resource blocks, RBs, respectively, and the plurality of frequency RBs to which the plurality of E-REGs belong are different from each other;

wherein the plurality of E-CCEs for transmitting the E-PDCCH are formed as follows;

determining the plurality of frequency RBs for transmitting the E-PDCCH,

determining one or more E-REGs corresponding to each RB, and

aggregating all the determined E-REGs into the plurality of E-CCEs.

9. The method of claim 8, wherein the RBs are allocated to a UE by a base station and discretely distributed in a system bandwidth.

10. The method of claim 8, wherein E-REGs corresponding to each RB are the ones determined by all available REs in one physical resource area block of the RB, and the available REs are all REs except REs for transmitting a legacy PDCCH and reference signals in the physical resource area block;

and wherein the physical resource area block occupies all OFDM symbols except OFDM symbols occupied by the legacy PDCCH in one physical resource block pair, PRB pair, in a time domain, and occupies all subcarriers of the RB in a frequency domain;

or

the physical resource area block occupies all OFDM symbols except OFDM symbols occupied by the legacy PDCCH in one PRB in the time domain, and occupies all subcarriers of the RB in the frequency domain;

or

the physical resource area block occupies all OFDM symbols except the OFDM symbols occupied by the legacy PDCCH in one PRB pair in the time domain, and occupies one subcarrier or a plurality of continuous subcarriers of the RB in the frequency domain;

or

the physical resource area block occupies all OFDM symbols except the OFDM symbols occupied by the legacy PDCCH in one PRB in the time domain, and occupies one subcarrier or a plurality of continuous subcarriers of the RB in the frequency domain.

11. The method of claim 8, wherein receiving the at least one DCI to be transmitted over the E-PDCCH in the plurality of E-CCEs for transmitting the E-PDCCH comprises:

de-interleaving an E-REG sequence corresponding to the plurality of E-CCEs to obtain a plurality of E-REGs sequenced from low frequency to high frequency, successively obtaining a plurality of sub-blocks, SBs, borne in the plurality of E-REGs respectively, and obtaining modulation symbols corresponding to the at least one DCI from the plurality of SBs, to obtain the at least one DCI.

12. The method of claim 8, wherein receiving the at least one DCI to be transmitted over the E-PDCCH in the plurality of E-CCEs for transmitting the E-PDCCH comprises:

obtaining a plurality of SBs borne in a plurality of E-REGs corresponding to the plurality of E-CCEs and sequenced from low frequency to high frequency respectively, de-interleaving the plurality of SBs to obtain an SB sequence, and obtaining modulation symbols corresponding to the at least one DCI from the SB sequence, to obtain the at least one DCI.

13. A device for receiving control information, comprising:

a receiving component, configured to receive a plurality of enhanced control channel elements, E-CCEs, for transmitting an enhanced physical downlink control channel, E-PDCCH, wherein each E-CCE comprises a same number of enhanced resource element groups, E-REGs, and each of a plurality of E-REGs comprised in one E-CCE belongs to a plurality of frequency resource blocks, RBs, respectively, and the plurality of frequency RBs to which the plurality of E-REGs belong are different from each other; and

a control information obtaining component, configured to obtain at least one downlink control information, DCI, to be transmitted over the E-PDCCH from the plurality of E-CCEs;

wherein the plurality of E-CCEs for transmitting the E-PDCCH are formed as follows;

determining the plurality of frequency RBs for transmitting the E-PDCCH,

determining one or more E-REGs corresponding to each RB, and

aggregating all the determined E-REGs into the plurality of E-CCEs.

14. The device of claim 13, wherein the control information obtaining component is further configured to:

de-interleave an E-REG sequence corresponding to the plurality of E-CCEs to obtain a plurality of E-REGs sequenced from low frequency to high frequency, successively obtain a plurality of sub-blocks, SBs, borne in the plurality of E-REGs respectively, and obtain modulation symbols corresponding to the at least one DCI from the plurality of SBs, thus obtaining the at least one DCI.

15. The device of claim 13, wherein the control information obtaining component is further configured to:

obtain a plurality of SBs borne in a plurality of E-REGs corresponding to the plurality of E-CCEs and sequenced from low frequency to high frequency respectively, de-interleave the plurality of SBs to obtain an SB sequence, and obtain modulation symbols corresponding to the at least one DCI from the SB sequence, thus obtaining the at least one DCI.