WIRELESS COMMUNICATION BASE STATION DEVICE, WIRELESS COMMUNICATION TERMINAL DEVICE, CCE ALLOCATION METHOD AND CCE BLIND DECODING METHOD

• US 20120127946A1
• Filed: 08/16/2010
• Published: 05/24/2012
• Est. Priority Date: 08/17/2009
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nishio, Akihiko, Nakao, Seigo
• Granted Patent: US 9,350,486 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 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• 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: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Disclosed is a wireless communication base station device which makes it possible to provide a base station, terminal and CCE allocation method capable of reducing the number of times blind decoding of a terminal is performed, without increasing the CCE block rate, even when a plurality of unit bands are set in a terminal. In this device, a search space setting section (103) sets in each of a plurality of unit bands a common search space in respect of a terminal which is communicating using the plurality of unit bands and other terminals, and sets in each of the plurality of unit bands an individual search space in respect of the terminal. An allocation section (106) allocates control information solely to CCEs within the common search spaces set in specified unit bands among the plurality of unit bands, or solely to CCEs within individual search spaces set in specified unit bands. Alternatively, the allocation section (106) allocates control information solely to CCEs within a common search space from among the common search spaces and the individual search spaces set in each of the plurality of unit bands.

Claims

1. A radio communication base station apparatus comprising:

a setting section that sets a common search space for a radio communication terminal apparatus communicating using a plurality of component bands and another radio communication terminal apparatus in each of the plurality of component bands and sets a specific search space for the radio communication terminal apparatus in each of the plurality of component bands; and

an assignment section that assigns control information addressed to the radio communication terminal apparatus to a control channel element (CCE) within the common search space or a CCE within the specific search space, wherein

the assignment section assigns the control information only to a CCE within the common search space set in a specific component band or a CCE within the specific search space set in the specific component band among the plurality of component bands, or assigns the control information only to a CCE within the common search space among the common search space and the specific search space set in the plurality of component bands respectively.

2. The radio communication base station apparatus according to claim 1, wherein when the control information is assigned only to the CCE within the common search space set in the specific component band or the CCE within the specific search space set in the specific component band among the plurality of component bands, the assignment section assigns the control information to which indication information is added, to the CCE within the specific search space set in the specific component band, the indication information indicating a component band subject to assignment of resource assignment information indicated by the control information among the plurality of component bands.

3. The radio communication base station apparatus according to claim 2, wherein the setting section sets all the specific search spaces for each of the plurality of component bands in the specific component band, and

the assignment section assigns the control information to which the indication information is added only to a CCE within the specific search space corresponding to the specific component band among the specific search spaces corresponding to the plurality of component bands set for the specific component band respectively.

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

a reception section that receives control information assigned to a common search space set for the radio communication terminal apparatus and another radio communication terminal apparatus for each of the plurality of component bands and a specific search space set for the radio communication terminal apparatus for each of the plurality of component bands;

a calculation section that calculates the specific search space set for the radio communication terminal apparatus; and

a decoding section that performs a blind decoding on a control channel element (CCE) within the common search space or a CCE within the specific search space, to obtain the control information addressed to the radio communication terminal apparatus, wherein

the decoding section performs the blind decoding only on a CCE within the common search space set in a specific component band and a CCE within the specific search space set in the specific component band among the plurality of component bands, or performs the blind decoding only on a CCE within the common search space among the common search space and the specific search space set in the plurality of component bands respectively.

5. A control channel element (CCE) assignment method comprising:

setting a common search space for a radio communication terminal apparatus communicating using plurality of component bands and another radio communication terminal apparatus in each of the plurality of component bands and setting a specific search space for the radio communication terminal apparatus in each of the plurality of component bands; and

assigning control information addressed to the radio communication terminal apparatus only to a CCE within the common search space set in a specific component band or a CCE within the specific search space set in the specific component band among the plurality of component bands, or assigning the control information only to a CCE within the common search space among the common search space and the specific search space set in the plurality of component bands respectively.

6. A control channel element (CCE) blind decoding method for a radio communication terminal apparatus communicating using a plurality of component bands, comprising:

receiving control information assigned to a common search space set for the radio communication terminal apparatus and another radio communication terminal apparatus in each of the plurality of component bands and a specific search space set for the radio communication terminal apparatus in each of the plurality of component bands;

calculating the specific search space set for the radio communication terminal apparatus; and

performing a blind decoding only a CCE within the common search space set in a specific component band and a CCE within the specific search space set in the specific component band among the plurality of component bands or performing the blind decoding only a CCE within the common search space among the common search space and the specific search space set in the plurality of component bands respectively, to obtain the control information addressed to the radio communication terminal apparatus.