Base station apparatus, terminal apparatus, transmission method, and reception method

• US 9,432,989 B2
• Filed: 11/13/2015
• Issued: 08/30/2016
• Est. Priority Date: 07/25/2012
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Horiuchi, Ayako, Takeda, Kazuki
• Primary Examiner(s): Jiang, Charles C
• Assistant Examiner(s): BUTT, WALLI Z
• Application Number:
  US14/941,402
• Publication Number:
  US 20160073384A1
• Time in Patent Office: 291 Days
• Field of Search: 370/311, 370/329
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Disclosed is a base station apparatus in which a configuration section (102) configures, within a data assignable region for a terminal apparatus (200), a first search space and a second search space each being a candidate to which control information is assigned, each of the first search space and the second search space including a plurality of control channel elements, and a signal assignment section (105) assigns control information to each of the first search space and the second search space. In addition, the configuration section (102) allocates numbers to a plurality of first control channel elements included in the first search space in an ascending order, and allocates numbers larger than or identical with the numbers allocated to the first control channel elements to a plurality of second control channel elements included in the second search space.

Claims

1. A communication apparatus comprising:

a receiver which, in operation, receives physical resource block (PRB) pair information related to PRB pairs; and

circuitry which, in operation, specifies, based on the PRB pair information, at least one of (i) a first search space for localized transmission, which is comprised of a plurality of first control channel elements (CCEs), each first CCE consisting of four enhanced resource element groups (EREGs) in one PRB pair, and (ii) a second search space for distributed transmission, which is comprised of a plurality of second CCEs, each second CCE consisting of four EREGs distributed among a plurality of PRB pairs, wherein each of the one or the plurality of PRB pairs is divided into sixteen EREGs,

wherein;

the receiver, in operation, further receives assignment information mapped to at least one of the first search space and the second search space; and

four EREGs that are provided in one PRB pair, which form a portion of EREGs that correspond to a subset of the plurality of second CCEs, are identical to four EREGs that correspond to one first CCE of a subset of the plurality of first CCEs, and four EREGs that are provided in another PRB pair, which form another portion of the EREGs that correspond to said subset of the plurality of second CCEs, are identical to four EREGs that correspond to another first CCE of said subset of the plurality of first CCEs.

2. The communication apparatus according to claim 1, wherein the subset of the plurality of first CCEs is comprised of four first CCEs and the subset of the plurality of second CCEs is comprised of four second CCEs.

3. The communication apparatus according to claim 1, wherein said circuitry, in operation, specifies the plurality of PRB pairs as the first search space or the second search space, and the plurality of first CCEs or the plurality of second CCEs, which constitute the plurality of PRB pairs, are sequentially numbered from zero.

4. The communication apparatus according to claim 1, wherein said circuitry, in operation, specifies first PRB pairs defining the first search space and second PRB pairs defining the second search space, the plurality of first CCEs constituting the first PRB pairs are sequentially numbered from zero, and the plurality of second CCEs constituting the second PRB pairs are sequentially numbered from zero.

5. The communication apparatus according to claim 1, wherein one second CCE corresponds to different EREGs in different PRB pairs.

6. The communication apparatus according to claim 1, wherein at least one of the first search space and the second search space is specified in a physical downlink shared channel (PDSCH) region, each of the plurality of first CCEs and the plurality of second CCEs is an enhanced CCE (ECCE), and the assignment information is received on an enhanced physical downlink control channel (EPDCCH).

7. A communication method performed by circuitry, the communication method comprising:

receiving physical resource block (PRB) pair information related to PRB pairs;

specifying, based on the PRB pair information, at least one of (i) a first search space for localized transmission, which is comprised of a plurality of first control channel elements (CCEs), each first CCE consisting of four enhanced resource element groups (EREGs) in one PRB pair, and (ii) a second search space for distributed transmission, which is comprised of a plurality of second CCEs, each second CCE consisting of four EREGs distributed among a plurality of PRB pairs, wherein each of the one or the plurality of PRB pairs is divided into sixteen EREGs; and

receiving assignment information mapped to at least one of the first search space and the second search space,

wherein four EREGs that are provided in one PRB pair, which form a portion of EREGs that correspond to a subset of the plurality of second CCEs, are identical to four EREGs that correspond to one first CCE of a subset of the plurality of first CCEs, and four EREGs that are provided in another PRB pair, which form another portion of the EREGs that correspond to said subset of the plurality of second CCEs, are identical to four EREGs that correspond to another first CCE of said subset of the plurality of first CCEs.

8. The communication method according to claim 7, wherein the subset of the plurality of first CCEs is comprised of four first CCEs and the subset of the plurality of second CCEs is comprised of four second CCEs.

9. The communication method according to claim 7, wherein the plurality of PRB pairs are specified as the first search space or the second search space, and the plurality of first CCEs or the plurality of second CCEs, which constitute the plurality of PRB pairs, are sequentially numbered from zero.

10. The communication method according to claim 7, wherein first PRB pairs defining the first search space and second PRB pairs defining the second search space are specified, the plurality of first CCEs constituting the first PRB pairs are sequentially numbered from zero, and the plurality of second CCEs constituting the second PRB pairs are sequentially numbered from zero.

11. The communication method according to claim 7, wherein one second CCE corresponds to different EREGs in different PRB pairs.

12. The communication method according to claim 7, wherein at least one of the first search space and the second search space is specified in a physical downlink shared channel (PDSCH) region, each of the plurality of first CCEs and the plurality of second CCEs is an enhanced CCE (ECCE), and the assignment information is received on an enhanced physical downlink control channel (EPDCCH).