Method and apparatus for communications with carrier aggregation
First Claim
1. A method at a base station comprising:
- performing data transmission to a user equipment in a communications system supporting carrier aggregation of at least one first carrier on which a short Transmission Time Interval, TTI is applied and at least one second carrier on which a long TTI is applied;
transmitting at least one downlink scheduling grant corresponding to data transmission to the user equipment in a downlink control region of at least one of a short TTI on a first carrier and a long TTI on a second carrier; and
performing downlink data transmission towards the user equipment in a data transmission region of a short TTI on the first carrier and in the data transmission region of a long TTI on the second carrier as indicated by the at least one downlink scheduling grant;
wherein said transmitting at least one downlink scheduling grant corresponding to data transmission to the user equipment comprises transmitting, in the downlink control region of a short TTI on the first carrier, a downlink scheduling grant corresponding to data transmission on the second carrier and transmitting, in the downlink control region of a short TTI on the first carrier, a downlink scheduling grant corresponding to data transmission on the first carrier;
the downlink data transmission on the first carrier is performed in the short TTI where the corresponding downlink scheduling grant is transmitted or in a short TTI immediately following the short TTI where the corresponding downlink scheduling grant is transmitted; and
the downlink data transmission on the second carrier is performed in a long TTI whose index nlong and the index nshort of the short TTI where the corresponding downlink scheduling grant is transmitted have a relationship of nlong=nshort/2, wherein nshort is an even integer.
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Accused Products
Abstract
Embodiments of the present disclosure provide a method at a base station for performing data transmission to a user equipment in a communications system supporting carrier aggregation of at least one first carrier on which a short TTI is applied and at least one second carrier on which a long TTI is applied. The method comprises transmitting at least one DL scheduling grant corresponding to data transmission to the user equipment in a DL control region of at least one of a short TTI on a first carrier and a long TTI on a second carrier and performing DL data transmission towards the user equipment in a data transmission region of a short TTI on the first carrier and in the data transmission region of a long TTI on the second carrier as indicated by the at least one DL scheduling grant. There are also provided a method for performing data transmission at a user equipment and a method for transmitting HARQ feedback at a base station or a user equipment.
9 Citations
13 Claims
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1. A method at a base station comprising:
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performing data transmission to a user equipment in a communications system supporting carrier aggregation of at least one first carrier on which a short Transmission Time Interval, TTI is applied and at least one second carrier on which a long TTI is applied; transmitting at least one downlink scheduling grant corresponding to data transmission to the user equipment in a downlink control region of at least one of a short TTI on a first carrier and a long TTI on a second carrier; and performing downlink data transmission towards the user equipment in a data transmission region of a short TTI on the first carrier and in the data transmission region of a long TTI on the second carrier as indicated by the at least one downlink scheduling grant; wherein said transmitting at least one downlink scheduling grant corresponding to data transmission to the user equipment comprises transmitting, in the downlink control region of a short TTI on the first carrier, a downlink scheduling grant corresponding to data transmission on the second carrier and transmitting, in the downlink control region of a short TTI on the first carrier, a downlink scheduling grant corresponding to data transmission on the first carrier; the downlink data transmission on the first carrier is performed in the short TTI where the corresponding downlink scheduling grant is transmitted or in a short TTI immediately following the short TTI where the corresponding downlink scheduling grant is transmitted; and the downlink data transmission on the second carrier is performed in a long TTI whose index nlong and the index nshort of the short TTI where the corresponding downlink scheduling grant is transmitted have a relationship of nlong=nshort/2, wherein nshort is an even integer. - View Dependent Claims (2, 3)
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4. A method at a user equipment comprising:
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transmitting Hybrid Automatic Repeat reQuest, HARQ feedback to a base station in a communications system supporting carrier aggregation of at least one first carrier on which a short Transmission Time Interval, TTI, is applied and at least one second carrier on which a long TTI is applied; receiving downlink data transmission from the base station in a data transmission region of a short TTI on a first carrier and in the data transmission region of a long TTI on a second carrier; and transmitting HARQ feedback for the received downlink data transmission towards the base station in an uplink control region of at least one of a short TTI on the first carrier and a long TTI on the second carrier; wherein the HARQ feedback for the downlink data transmission received on the second carrier is transmitted on the second carrier in a long TTI immediately following or two long TTIs later than the long TTI where the downlink data transmission is received; and the HARQ feedback for the downlink data transmission received on the first carrier is transmitted on the second carrier in a long TTI whose index nlong and the index nshort of the short TTI where the downlink data transmission is received have a relationship of nlong=floor(nshort/2)+1, wherein nshort is an integer. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method at a user equipment comprising:
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performing data transmission to a base station in a communications system supporting carrier aggregation of at least one first carrier on which a short Transmission Time Interval, TTI is applied and at least one second carrier on which a long TTI is applied; receiving at least one uplink scheduling grant for data transmission to the base station in a downlink control region of at least one of a short TTI on a first carrier and a long TTI on a second carrier; and performing uplink data transmission towards the base station in a data transmission region of a short TTI on the first carrier and in the data transmission region of a long TTI on the second carrier as indicated by the at least one uplink scheduling grant; said receiving at least one uplink scheduling grant for data transmission to the base station comprises receiving, in the downlink control region of a short TTI on the first carrier, an uplink scheduling grant for data transmission on the first carrier and receiving, in the downlink control region of a short TTI on the first carrier, an uplink scheduling grant for data transmission on the second carrier; the uplink data transmission on the first carrier is performed in a short TTI immediately following the short TTI where the corresponding uplink scheduling grant is received; and the uplink data transmission on the second carrier is performed in a long TTI whose index nlong and the index nshort of the short TTI where the corresponding uplink scheduling grant is received have a relationship of nlong=nshort/2, wherein nshort is an even integer or in a long TTI whose index nlong and the index nshort of the short TTI where the corresponding uplink scheduling grant is received have a relationship of nlong=1+nshort/2 wherein nshort is an even integer. - View Dependent Claims (12, 13)
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Specification