BASE STATION APPARATUS, COMMUNICATION METHOD, TERMINAL APPARATUS AND INTEGRATED CIRCUIT

• US 20180263023A1
• Filed: 05/09/2018
• Published: 09/13/2018
• Est. Priority Date: 10/31/2008
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Nakao, Seigo, Nishio, Akihiko, Imamura, Daichi, Aoyama, Takahisa
• Granted Patent: US 10,631,282 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• 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

Provided are a radio terminal device, a radio base station device, and a channel signal forming method which can prevent quality degradation of the downlink resource allocation information by reducing the frequency of the zero information addition process to the downlink resource allocation information when executing communication using an uplink unit band and multiple downlink unit bands correlated to the uplink unit band. A base station includes: a PDCCH generation unit which includes the uplink allocation information relating to the uplink unit band only in some of the channel signals formed for each of the downlink unit bands; and a padding unit which adds zero information to the downlink allocation information only in the selected some channel signals having the bandwidth of the corresponding downlink unit band smaller than that of the uplink unit band until the downlink allocation information size becomes equal to the uplink allocation information size.

Claims

1. An integrated circuit comprising:

at least one input, which, in operation, receives an input; and

circuitry coupled to the at least one input, the circuitry, in operation, controls;

receiving from a communication partner apparatus a first downlink control signal over a basic downlink component carrier and a second downlink control signal over another downlink component carrier, wherein the first downlink control signal includes uplink resource allocation information related to a resource allocation of an uplink component carrier and first downlink resource allocation information related to a resource allocation of the basic downlink component carrier, and the second downlink control signal includes second downlink resource allocation information related to a resource allocation of the another downlink component carrier, wherein for the first downlink control signal when a number of uplink information bits necessary to transmit the uplink resource allocation information is different from a number of downlink information bits necessary to transmit the first downlink resource allocation information, zeros are appended by the communication partner apparatus to a smaller one of the uplink resource allocation information and the first downlink resource allocation information until a payload size of the smaller one equals a payload size of a larger one, and Cyclic Redundancy Check (CRC) bits are further added by the communication partner apparatus to the uplink resource allocation information and the first downlink resource allocation information; and

using the payload size of the larger one of the uplink resource allocation information and the first downlink resource allocation information in decoding processing of the first downlink control signal.

2. The integrated circuit according to claim 1, wherein

the circuitry, in operation, controls determining the added CRC bits based on the payload size of the larger one of the uplink resource allocation information and the first downlink resource allocation information.

3. The integrated circuit according to claim 2, wherein

the circuitry, in operation, controls verifying based on the added CRC bits whether the first downlink control signal including the uplink resource allocation information and the basic downlink resource allocation information is directed to the communication apparatus.

4. The integrated circuit according to claim 1, wherein

a bandwidth of the basic downlink component carrier, a bandwidth of the another downlink component carrier, and a bandwidth of the uplink component carrier are set independently of each other.

5. The integrated circuit according to claim 1, wherein

the number of downlink information bits necessary to transmit the first downlink resource allocation information is determined based on a bandwidth of the basic downlink component carrier, and the number of uplink information bits necessary to transmit the uplink resource allocation information is determined based on a bandwidth of the uplink component carrier.

6. The integrated circuit according to claim 1, wherein

the payload size of the larger one of the uplink resource allocation information and the first downlink resource allocation information equals a greater one of the number of downlink information bits necessary to transmit the first downlink resource allocation information and the number of uplink information bits necessary to transmit the uplink resource allocation information.

7. The integrated circuit according to claim 1, wherein

the another downlink component carrier is a newly added component carrier.

8. The integrated circuit according to claim 1, wherein

the basic downlink component carrier is a downlink component carrier having a smallest bandwidth among a plurality of downlink component carriers having larger bandwidths than a bandwidth of the uplink component carrier.

9. An integrated circuit comprising:

reception circuitry, which, in operation, receives from a communication partner apparatus a first downlink control signal over a basic downlink component carrier and a second downlink control signal over another downlink component carrier, wherein the first downlink control signal includes uplink resource allocation information related to a resource allocation of an uplink component carrier and first downlink resource allocation information related to a resource allocation of the basic downlink component carrier, and the second downlink control signal includes second downlink resource allocation information related to a resource allocation of the another downlink component carrier, wherein for the first downlink control signal when a number of uplink information bits necessary to transmit the uplink resource allocation information is different from a number of downlink information bits necessary to transmit the first downlink resource allocation information, zeros are appended by the communication partner apparatus to a smaller one of the uplink resource allocation information and the first downlink resource allocation information until a payload size of the smaller one equals a payload size of a larger one, and Cyclic Redundancy Check (CRC) bits are further added by the communication partner apparatus to the uplink resource allocation information and the first downlink resource allocation information; and

processing circuitry, which is coupled to the reception circuitry and which, in operation, uses the payload size of the larger one of the uplink resource allocation information and the first downlink resource allocation information in decoding processing of the first downlink control signal.

10. The integrated circuit according to claim 9, wherein

the processing circuitry, in operation, determines the added CRC bits based on the payload size of the larger one of the uplink resource allocation information and the first downlink resource allocation information.

11. The integrated circuit according to claim 10, wherein

the processing circuitry, in operation, verifies based on the added CRC bits whether the first downlink control signal including the uplink resource allocation information and the basic downlink resource allocation information is directed to the communication apparatus.

12. The integrated circuit according to claim 9, wherein

a bandwidth of the basic downlink component carrier, a bandwidth of the another downlink component carrier, and a bandwidth of the uplink component carrier are set independently of each other.

13. The integrated circuit according to claim 9, wherein

the number of downlink information bits necessary to transmit the first downlink resource allocation information is determined based on a bandwidth of the basic downlink component carrier, and the number of uplink information bits necessary to transmit the uplink resource allocation information is determined based on a bandwidth of the uplink component carrier.

14. The integrated circuit according to claim 9, wherein

the payload size of the larger one of the uplink resource allocation information and the first downlink resource allocation information equals a greater one of the number of downlink information bits necessary to transmit the first downlink resource allocation information and the number of uplink information bits necessary to transmit the uplink resource allocation information.

15. The integrated circuit according to claim 9, wherein

the another downlink component carrier is a newly added component carrier.

16. The integrated circuit according to claim 9, wherein

the basic downlink component carrier is a downlink component carrier having a smallest bandwidth among a plurality of downlink component carriers having larger bandwidths than a bandwidth of the uplink component carrier.