Abstract
In the present disclosure even if different UL-DL configurations are set for a plurality of unit bands notification timing of error detection results for SCell is not dispersed complicatedly and the processing relating to the error detection results can be simplified. At the reference notification timing of a response signal with respect to downlink data of a second unit band if a sub-frame of the second unit band is an uplink communication sub-frame and a sub-frame of a first unit band is a downlink communication sub-frame a control unit ( 208) transmits the response signal with respect to the downlink data in a specific uplink communication sub-frame (for example #2 or #7) set in the first unit band.
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Specification Information
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Technologies
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Technologies
Signal Processing Frame structure
Product
Use Cases
Wireless communication
Services
Claim
1. A communication apparatus comprising:
a transmitter which, in operation, transmits downlink data on a first component carrier and a second component carrier, wherein the first component carrier and the second component carrier have different frame configuration patterns among a plurality of frame configuration patterns, each frame configuration pattern defining transmission timings of one or more uplink subframes and one or more downlink subframes within a frame;
a receiver which, in operation, receives a response signal indicating error detection results of the downlink data for the first component carrier and the second component carrier, the response signal received in specified uplink subframe(s) within the frame only on the first component carrier, wherein subframe(s) other than the specified uplink subframe(s) within the frame are not used for receiving the response signal, the specified uplink subframe(s) having a transmission timing that is defined according to the same periodicity as a periodicity of a switching point from downlink transmission to uplink transmission (DL/UL switching point), the plurality of frame configuration patterns including at least two frame configuration patterns whose periodicity of the DL/UL switching point is different from each other; and
a controller which, in operation, determines whether or not to retransmit the downlink data based on the received response signal.
2. The communication apparatus according to claim 1, wherein
the plurality of frame configuration patterns include one frame configuration pattern whose periodicity of the DL/UL switching point is 5 milliseconds (ms) and another frame configuration pattern whose periodicity of the DL/UL switching point is 10 ms;
if the periodicity of the DL/UL switching point in a first frame configuration pattern for the first component carrier is 5 ms, a number of the specified uplink subframe(s) included in one frame is two; and
if the periodicity of the DL/UL switching point in the first frame configuration pattern for the first component carrier is 10 ms, the number of the specified uplink subframe(s) included in one frame is one.
3. The communication apparatus according to claim 2, wherein
the one frame is comprised of ten subframes with indexes #0, #1, #2, #3, #4, #5, #6, #7, #8, #9; and
if the periodicity of the DL/UL switching point in the first frame configuration pattern is 5 ms, the specified uplink subframe(s) are subframe #2 and subframe #7; and
if the periodicity of the DL/UL switching point in the first frame configuration pattern is 10 ms, the specified uplink subframe is subframe #2.
4. The communication apparatus according to claim 1, wherein
each of the plurality of configuration patterns includes a special subframe including a guard period for switching from a downlink subframe to a uplink subframe; and
the periodicity of the DL/UL switching point is a periodicity of the special subframe.
5. The communication apparatus according to claim 4, wherein the specified uplink subframe(s) is a subframe located next to the special subframe in a time domain.
6. The communication apparatus according to claim 1, wherein a ratio of the uplink subframe(s) and the downlink subframe(s) included in a single frame according to a first frame configuration pattern for the first component carrier is different from a ratio of the uplink subframe(s) and the downlink subframe(s) included in the single frame according to a second frame configuration pattern for the second component carrier.
7. The communication apparatus according to claim 1, wherein the specified uplink subframe(s) is an uplink subframe located at an earliest transmission timing which is more than four subframes after the one or more downlink subframes.
8. A communication method comprising:
transmitting downlink data on a first component carrier and a second component carrier, wherein the first component carrier and the second component carrier have different frame configuration patterns among a plurality of frame configuration patterns, each frame configuration pattern defining transmission timings of one or more uplink subframes and one or more downlink subframes within a frame;
receiving a response signal indicating error detection results of the downlink data for the first component carrier and the second component carrier, the response signal received in specified uplink subframe(s) within the frame only on the first component carrier, wherein subframe(s) other than the specified uplink subframe(s) within the frame are not used for receiving the response signal, the specified uplink subframe(s) having a transmission timing that is defined according to the same periodicity as a periodicity of a switching point from downlink transmission to uplink transmission (DL/UL switching point), the plurality of frame configuration patterns including at least two frame configuration patterns whose periodicity of the DL/UL switching point is different from each other; and
determining whether or not to retransmit the downlink data based on the received response signal.
9. The communication method according to claim 8, wherein
the plurality of frame configuration patterns include one frame configuration pattern whose periodicity of the DL/UL switching point is 5 milliseconds (ms) and another frame configuration pattern whose periodicity of the DL/UL switching point is 10 ms;
if the periodicity of the DL/UL switching point in a first frame configuration pattern for the first component carrier is 5 ms, a number of the specified uplink subframe(s) included in one frame is two; and
if the periodicity of the DL/UL switching point in the first frame configuration pattern for the first component carrier is 10 ms, the number of the specified uplink subframe(s) included in one frame is one.
10. The communication method according to claim 9, wherein
the one frame is comprised of ten subframes with indexes #0, #1, #2, #3, #4, #5, #6, #7, #8, #9; and
if the periodicity of the DL/UL switching point in the first frame configuration pattern is 5 ms, the specified uplink subframe(s) are subframe #2 and subframe #7; and
if the periodicity of the DL/UL switching point in the first frame configuration pattern is 10 ms, the specified uplink subframe is subframe #2.
11. The communication method according to claim 8, wherein
each of the plurality of configuration patterns includes a special subframe including a guard period for switching from a downlink subframe to a uplink subframe; and
the periodicity of the DL/UL switching point is a periodicity of the special subframe.
12. The communication method according to claim 8, wherein the specified uplink subframe(s) is a subframe located next to the special subframe in a time domain.
13. The communication method according to claim 8, wherein a ratio of the uplink subframe(s) and the downlink subframe(s) included in a single frame according to a first frame configuration pattern for the first component carrier is different from a ratio of the uplink subframe(s) and the downlink subframe(s) included in the single frame according to a second frame configuration pattern for the second component carrier.
14. The communication method according to claim 8, wherein the specified uplink subframe(s) is an uplink subframe located at an earliest transmission timing which is more than four subframes after the one or more downlink subframes.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.