WIRELESS COMMUNICATION BASE STATION EQUIPMENT, WIRELESS COMMUNICATION TERMINAL DEVICE AND SEARCH SPACE SETTING METHOD

• US 20110194525A1
• Filed: 10/30/2009
• Published: 08/11/2011
• Est. Priority Date: 10/31/2008
• Status: Active Grant

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nishio, Akihiko, Nakao, Seigo, Imamura, Daichi, Hoshino, Masayuki
• Granted Patent: US 8,787,275 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0042 intra-user or intra-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/29 between an access point and the access point controlling device
• CPC Class Codes: H04W 74/085 : collision avoidance
• CPC Class Codes: H05K 999/00 : dummy group
• CPC Class Codes: H05K 999/99 : dummy group

Abstract

Disclosed is wireless communication base station equipment in which CCE allocation can be flexibly performed without collision of ACK/NACK signals between a plurality of unit bands, even when wideband transmission is performed exclusively on a downlink circuit. In this equipment, an allocation unit (105) sets up mutually different search spaces for each of a plurality of downlink unit bands, with respect to wireless communication terminal devices that communicate using a plurality of downlink unit bands, and allocates resource allocation information of downlink circuit data destined for the wireless communication terminal devices to CCEs in mutually different search spaces for each of the plurality of downlink unit bands, and an ACK/NACK reception unit (119); extracts a response signal in respect of the downlink circuit data from the uplink control channel associated with the CCE to which the resource allocation information of this downlink circuit data was allocated.

Claims

1. A radio communication base station apparatus comprising:

an allocation section that sets different search spaces for a plurality of downlink component bands in a radio communication terminal apparatus that communicates using the plurality of downlink component bands, and allocates resource allocation information of downlink data directed to the radio communication terminal apparatus to control channel elements (CCEs) in the search space; and

a receiving section that extracts a response signal to the downlink data from an uplink control channel associated with the CCEs to which the resource allocation information is allocated.

2. The radio communication base station apparatus according to claim 1, wherein the allocation section sets the search spaces of the plurality of downlink component bands so as to neighbor each other.

3. The radio communication base station apparatus according to claim 1, wherein the allocation section sets start position S_n+1 of the search space of an (n+1)-th downlink component band of the plurality of downlink component bands to (S_n+L) mod N_CCE (where S_n is the start position of the search space of the n-th downlink component band, L is the number of CCEs making up the search space and N_CCE is the total number of CCEs for every plurality of downlink component bands).

4. The radio communication base station apparatus according to claim 1, wherein the allocation section causes CCE spacing between the start positions of the search spaces for every plurality of downlink component bands to differ between the plurality of radio communication terminals.

5. The radio communication base station apparatus according to claim 4, wherein, in the plurality of downlink component bands, the allocation section sets start position S_n+1 of the search space of an (n+1)-th downlink component band, to (S_n+M+L) mod N_CCE (where S_n is the start position of the search space of the n-th downlink component band, L is the number of CCEs making up the search space, M is a random value that differs between the plurality of radio communication terminals, (M+L) is the CCE spacing, and N_CCE is the total number of CCEs for every plurality of downlink component bands).

6. The radio communication base station apparatus according to claim 1, wherein the allocation section sets the search spaces for every plurality of downlink component bands independently of each other between the plurality of downlink component bands.

7. The radio communication base station apparatus according to claim 1, wherein the allocation section sets the search spaces based on different terminal IDs set in the plurality of downlink component bands respectively.

8. The radio communication base station apparatus according to claim 1, wherein, in the plurality of downlink component bands, the allocation section sets the search spaces of specific downlink component bands based on output of a hash function used to set start positions of search spaces of downlink component bands other than the specific downlink component bands.

9. A radio communication terminal apparatus that communicates using a plurality of downlink component bands, the radio communication terminal apparatus comprising:

a receiving section that blind-decodes control channel elements (CCEs) in different search spaces for the plurality of downlink component bands and obtains resource allocation information of downlink data directed to the radio communication terminal apparatus; and

a mapping section that maps a response signal to the downlink data to an uplink control channel associated with the CCEs to which the resource allocation information is allocated.

10. A search space setting method that sets different search spaces for a plurality of downlink component bands for a radio communication terminal apparatus that communicates using the plurality of downlink component bands.