Base station apparatus, mobile terminal apparatus and communication control method

• US 8,705,473 B2
• Filed: 04/05/2011
• Issued: 04/22/2014
• Est. Priority Date: 04/05/2010
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Abe, Tetsushi, Miki, Nobuhiko, Nagata, Satoshi, Jaturong, Sangiamwong
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): Andrews, III, Hoyet H
• Application Number:
  US13/261,462
• Publication Number:
  US 20130077576A1
• Time in Patent Office: 1,113 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/16 for PBS [Private Base Station] arrangements
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

To partially suppress interference to control channels of a pico-cell from a base station apparatus of a macro-cell and enable assignment of user data to a subframe besides the same subframe using a part of control channels with interference suppressed thereto, a base station apparatus disposed in a second system having a system band comprised of a plurality of component carriers for sharing at least a part of a frequency band with a first system having a macro-cell (C2) and covering a pico-cell (C1) is configured to generate a carrier indicator for indicating another component carrier to which user data is assigned besides the same component carrier on a control channel of the component carrier, while indicating another subframe to which user data is assigned besides the same subframe on the downlink control channel.

Claims

1. A base station apparatus in a small-scale cell of a second system having a system band comprised of a single or a plurality of base frequency blocks, for sharing at least a part of a frequency band with a first system having a large-scale cell and covering the small-scale cell, wherein the base station apparatus comprising:

an indication information generating section configured to generate indication information for a number of subframes, each subframe assigned individually to each of the plurality of the base frequency blocks constituting the system band of the second system, indicating another subframe to which user data is assigned besides a same subframe on a downlink control channel; and

a transmission frame generating section configured to generate a transmission frame including the indication information.

2. The base station apparatus according to claim 1, wherein the indication information indicates another subframe that does not overlap a blank period of a transmission frame of the first system on a control channel of a subframe that overlaps the blank period provided in the transmission frame of the first system.

3. The base station apparatus according to claim 1, wherein the indication information is associated with the number of subframes between the subframe of the downlink control channel and another subframe to which user data is assigned on the downlink control channel.

4. The base station apparatus according to claim 1, wherein the indication information includes a determination bit to determine whether the information is for base frequency block indication to indicate a base frequency block or for subframe indication to indicate a subframe.

5. The base station apparatus according to claim 4, wherein the indication information includes an index bit that indicates a base frequency block index associated with each base frequency block when the information is to identify the base frequency block, while indicating a subframe index associated with each subframe when the information is to identify the subframe.

18. The base station apparatus according to claim 2, wherein the indication information is associated with the number of subframes between the subframe of the downlink control channel and another subframe to which user data is assigned on the downlink control channel.

19. The base station apparatus according to claim 2, wherein the indication information includes a determination bit to determine whether the information is for base frequency block indication to indicate a base frequency block or for subframe indication to indicate a subframe.

6. A mobile terminal apparatus that communicates via a second system having a system band comprised of a single or a plurality of base frequency blocks, for sharing at least a part of a frequency band with a first system having a large-scale cell and covering a small-scale cell, wherein the mobile terminal apparatus comprising:

an indication information acquiring section configured to acquire, from a base station apparatus, indication information for a number of subframes, each subframe assigned individually to each of the plurality of the base frequency blocks constituting the system band of the second system, indicating another subframe to which user data is assigned besides a same subframe on a downlink control channel; and

a data demodulation section configured to demodulate the user data based on the indication information.

7. The mobile terminal apparatus according to claim 6, wherein the indication information indicates another subframe that does not overlap a blank period of a transmission frame of the first system on a control channel of a subframe that overlaps the blank period provided in the transmission frame of the first system.

8. The mobile terminal apparatus according to claim 6, wherein the indication information includes information indicative of the number of subframes between the subframe of the downlink control channel and another subframe to which user data is assigned on the downlink control channel.

9. The mobile terminal apparatus according to claim 6, wherein the indication information includes a determination bit to determine whether the information is for base frequency block indication to indicate a base frequency block or for subframe indication to indicate a subframe.

10. The mobile terminal apparatus according to claim 9, wherein the indication information includes an index bit that indicates a base frequency block index associated with each base frequency block when the information is to identify the base frequency block, while indicating a subframe index associated with each subframe when the information is to identify the subframe.

20. The mobile terminal apparatus according to claim 7, wherein the indication information includes information indicative of the number of subframes between the subframe of the downlink control channel and another subframe to which user data is assigned on the downlink control channel.

21. The mobile terminal apparatus according to claim 7, wherein the indication information includes a determination bit to determine whether the information is for base frequency block indication to indicate a base frequency block or for subframe indication to indicate a subframe.

11. A communication control method in a base station apparatus in a small-scale cell of a second system having a system band comprised of a single or a plurality of base frequency blocks, for sharing at least a part of a frequency band with a first system having a large-scale cell and covering a small-scale cell, wherein the communication control method comprising:

generating indication information for a number of subframes, each subframe assigned individually to each of the plurality of the base frequency blocks constituting the system band of the second system, indicating another subframe to which user data is assigned besides a same subframe on a downlink control channel; and

generating a transmission frame including the indication information.

12. A base station apparatus in a second system having a system band comprised of a single or a plurality of base frequency blocks, for sharing at least a part of a frequency band with a first system having a small-scale cell and covering a large-scale cell, wherein the base station apparatus comprising:

an indication information generating section configured to generate indication information for a number of subframes, each subframe assigned individually to each of the plurality of the base frequency blocks constituting the system band of the second system, indicating assignment of user data to another subframe in which a downlink control channel is not used besides a same subframe on a downlink control channel; and

a transmission frame generating section configured to generate a transmission frame including the indication information.

13. The base station apparatus according to claim 12, wherein before transmitting the transmission frame including the indication information to a mobile terminal apparatus, the base station apparatus notifies the mobile terminal apparatus of advance information to identify the subframe indicated by the indication information.

14. The base station apparatus according to claim 12, wherein the indication information is associated with the number of subframes between the subframe of the downlink control channel and another subframe to which user data is assigned on the downlink control channel.

15. The base station apparatus according to claim 14, wherein in addition to the number of subframes, the indication information is associated with a base frequency block used in indication of the another subframe.

22. The base station apparatus according to claim 13, wherein the indication information is associated with the number of subframes between the subframe of the downlink control channel and another subframe to which user data is assigned on the downlink control channel.

16. A mobile terminal apparatus that communicates via a second system having a system band comprised of a single or a plurality of base frequency blocks, for sharing at least a part of a frequency band with a first system having a small-scale cell and covering a large-scale cell, wherein the mobile terminal apparatus comprising:

an indication information acquiring section configured to acquire, from a base station apparatus, indication information for a number of subframes, each subframe assigned individually to each of the plurality of the base frequency blocks constituting the system band of the second system, indicating assignment of user data to another subframe in which a downlink control channel is not used besides a same subframe on a downlink control channel; and

a data demodulation section configured to demodulate the user data based on the indication information.

17. A communication control method in a base station apparatus in a second system having a system band comprised of a single or a plurality of base frequency blocks, for sharing at least a part of a frequency band with a first system having a small-scale cell and covering a large-scale cell, wherein the communication control method comprising:

generating indication information for a number of subframes, each subframe assigned individually to each of the plurality of the base frequency blocks constituting the system band of the second system, indicating assignment of user data to another subframe in which a downlink control channel is not used besides a same subframe on a downlink control channel; and

generating a transmission frame including the indication information.