Carrier aggregation method and apparatus for communication system
The present disclosure discloses a Carrier Aggregation (CA) method and device for a communication system. Herein, the CA method for the communication system includes that: multiple serving cells with subframe deviations are aggregated to obtain K Primary Cells (PCells) and M Secondary Cells (SCells), herein K and M are positive integers; and a transmission node transmits information on the multiple aggregated serving cells according to the subframe deviations.
1. A Carrier Aggregation, CA, method for a communication system, comprising:
aggregating multiple Time Division Duplex (TDD) serving cells with existence of subframe deviations to obtain K Primary Cells, PCells, and M Secondary Cells, SCells, wherein K and M are positive integers, wherein the subframe deviations comprise: corresponding subframe index difference values between the TDD serving cells under a same radio frame index, or difference values of subframes where synchronization channels are located between the multiple TDD serving cells; and
transmitting, by a transmission node, information in the multiple TDD serving cells according to the subframe deviations.
2. The method according to claim 1 , wherein existence of the subframe deviations comprises:
existence of the subframe deviations between TDD serving cells with adjacent cell indexes in the multiple TDD serving cells: or
existence of the subframe deviations between the multiple TDD serving cells and a fixed TDD serving cell, wherein the fixed TDD serving cell is a TDD serving cell in the multiple TDD serving cells.
3. The method according to claim 2 , wherein the fixed TDD serving cell is one of: a TDD serving cell serving as a PCell, a TDD serving cell with a maximum subframe index and a TDD serving cell predefined by the transmission node.
4. The method according to claim 1 , wherein the transmission node comprises a Node B and a terminal; transmitting, by the transmission node, information in multiple preset carriers according to the deviations comprises:
transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations; and/or
performing, by the Node B, information scheduling in the multiple TDD serving cells according to the subframe deviations, and transmitting information according to scheduling.
5. The method according to claim 4 , before transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations, further comprising: acquiring, by the terminal, the subframe deviations according to at least one of:
acquiring, by the terminal, the subframe deviations through signaling;
acquiring, by the terminal, the subframe deviations by detecting locations of synchronization channels corresponding to the multiple TDD serving cells; and
acquiring the subframe deviations by virtue of uplink and downlink configurations corresponding to the multiple TDD serving cells.
6. The method according to claim 5 , wherein, when the subframe deviations are acquired by virtue of the uplink and downlink configurations corresponding to the multiple TDD serving cells, the subframe deviations comprise at least one of that:
when the uplink and downlink configuration of a PCell is #0 and the uplink and downlink configuration of an SCell is #1, the subframe deviation is 3;
when the uplink and downlink configuration of the PCell is #1 and the uplink and downlink configuration of the SCell is #0, the subframe deviation is 2;
when the uplink and downlink configuration of the PCell is #2 and the uplink and downlink configuration of the SCell is #0, the subframe deviation is 2;
when the uplink and downlink configuration of the PCell is #3 and the uplink and downlink configuration of the SCell is #6, the subframe deviation is 3;
when the uplink and downlink configuration of the PCell is #4 and the uplink and downlink configuration of the SCell is 110, the subframe deviation is 2;
when the uplink and downlink configuration of the PCell is #5 and the uplink and downlink configuration of the SCell is #0, the subframe deviation is 2;
when the uplink and downlink configuration of the PCell is #6 and the uplink and downlink configuration of the SCell is #1, the subframe deviation is 3;
when the uplink and downlink configuration of the PCell is #6 and the uplink and downlink configuration of the SCell is #0, the subframe deviation is 2;
when the uplink and downlink configuration of the PCell is one of #0, #3 and #6, the subframe deviation is 3; and
when the uplink and downlink configuration of the PCell is one of #1, #2, #4 and #5, the subframe deviation is 2.
7. The method according to claim 6 , wherein transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations comprises:
under the condition that there are corresponding uplink subframes under each subframe index, if transmission of a Physical Downlink Shared Channel, PDSCH, corresponding to a Physical Downlink Control Channel/Enhanced-Physical Downlink Control Channel, PDCCH/EPDCCH, or a PDCCH/EPDCCH indicating Semi-Persistent Scheduling, SPS, release or no PDSCH corresponding to the PDCCH/EPDCCH is detected in PCell subframe n, or transmission of the PDSCH corresponding to the PDCCH/EPDCCH is detected in SCell subframe n, sending, by the terminal, a corresponding Hybrid Automatic Repeat Request-Acknowledgement, HARQ-ACK, in uplink subframe n+4, wherein
when a PCell and SCell corresponding to subframe n+4 are both uplink subframes, the terminal sends the HARQ-ACK in the PCell;
when the PCell corresponding to subframe n+4 is an uplink subframe and the SCell corresponding to subframe n+4 is a downlink subframe, the terminal sends the HARQ-ACK in the PCell; and
when the SCell corresponding to subframe n+4 is an uplink subframe and the PCell corresponding to subframe n+4 is a downlink subframe, the HARQ-ACK is sent in the SCell.
8. The method according to claim 6 , wherein transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations comprises:
when there are corresponding downlink subframes and uplink subframes under each subframe index, if Downlink Control Information, DCI, corresponding to transmission of a Physical Uplink Shared Channel, PUSCH, is detected in subframe n, transmitting, by the terminal, the PUSCH in subframe n+4, wherein selection of the TDD serving cell where the DCI is located comprises at least one of:
when there is no cross-carrier scheduling configured and a carrier corresponding to the PUSCH transmitted in subframe n+4 has a downlink subframe in subframe n, transmitting the DCI in the same TDD serving cell as that of the PUSCH;
when there is no cross-carrier scheduling configured and the carrier corresponding to the PUSCH transmitted in subframe n+4 does not have the downlink subframe in subframe n, transmitting the DCI in a different TDD serving cell from that of the PUSCH, and determining, by the terminal, the TDD serving cell where the DCI is located according to at least one of a timing deviation, an uplink and downlink proportion of aggregated TDD serving cells and high-layer signaling; and
when cross-carrier scheduling is configured, determining the carrier where the DCI corresponding to the PUSCH is located according to configuration.
9. The method according to claim 6 , wherein transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations comprises:
when there are corresponding downlink subframes and uplink subframes under each subframe index, sending, by the terminal, a PUSCH in subframe n, and detecting a Physical Hybrid ARQ Indicator or Channel, PHICH, corresponding to the PUSCH in subframe n+4, wherein selection of a TDD serving cell where the PHICH is located comprises at least one of:
when there is no cross-carrier scheduling configured and a carrier corresponding to the PUSCH transmitted in subframe n has a downlink subframe in subframe n+4, transmitting the PHICH in the same TDD serving cell as that of the PUSCH;
when there is no cross-carrier scheduling configured and the carrier corresponding to the PUSCH transmitted in subframe n does not have the downlink subframe in subframe n+4, transmitting the PHICH in a different TDD serving cell from that of the PUSCH, and determining, by the terminal, the TDD serving cell where the PHICH is located according to at least one of a timing deviation, an uplink and downlink proportion of aggregated TDD serving cells and high-layer signaling; and
when cross-carrier scheduling is configured, determining the carrier where the PHICH is located according to configuration.
10. The method according to claim 6 , wherein transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations comprises:
when there are corresponding downlink subframes and uplink subframes under each subframe index, detecting, by the terminal, a PHICH in subframe n, and if a PHICH feedback is a Negative Acknowledgement, NACK, sending a retransmitted PUSCH in subframe n+4, wherein
selection of a TDD serving cell where the retransmitted PUSCH is located comprises at least one of:
when there is no cross-carrier scheduling configured and a carrier corresponding to the PHICH transmitted in subframe n has an uplink subframe in subframe n+4, transmitting the retransmitted PUSCH in the same TDD serving cell as that of the PHICH;
when there is no cross-carrier scheduling configured and the carrier corresponding to the PHICH transmitted in subframe n does not have the uplink subframe in subframe n+4, transmitting the retransmitted PUSCH in a different TDD serving cell from that of the PHICH, and determining, by the terminal, the TDD serving cell where the retransmitted PUSCH is located according to at least one of a timing deviation, an uplink and downlink proportion of the aggregated TDD serving cells and high-layer signaling; and
when cross-carrier scheduling is configured, determining the carrier where the retransmitted PUSCH is located according to configuration.
11. The method according to claim 6 , wherein transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations comprises:
when there are corresponding uplink subframes under each subframe index, detecting, by the terminal, an uplink DCI format or random access response indication with a corresponding Channel State Information, CSI, triggering field set as trigger reporting in subframe n of TDD serving cell c, and sending aperiodic CSI reporting in the PUSCH corresponding to subframe n+4.
12. The method according to claim 6 , wherein transmitting, by the terminal, the information in the multiple TDD serving cells according to the subframe deviations comprises: if there are corresponding uplink subframes under each subframe index:
when a PCell and SCell corresponding to subframe n are both uplink subframes, sending periodic CSI in the PCell;
when the PCell corresponding to subframe n is an uplink subframe and the SCell corresponding to subframe n is a downlink subframe, sending the periodic CSI in the PCell; and
when the SCell corresponding to subframe n is an uplink subframe and the PCell corresponding to subframe n is a downlink subframe, sending the periodic CSI in the SCell,
wherein periodic CSIs of various TDD serving cells are configured according to a period and offset corresponding to an FDD system.
13. The method according to claim 4 , wherein performing, by the Node B, information scheduling in the multiple TDD serving cells according to the subframe deviations and transmitting the information according to scheduling comprises:
notifying, by the Node B, the subframe deviations; and
performing, by the Node B, information scheduling in the multiple preset TDD serving cells and performing corresponding information transmission according to scheduling.
14. The method according to claim 13 , wherein notifying, by the Node B, the subframe deviations comprises:
notifying, by the Node B, the terminal of the subframe deviations, and/or, notifying an adjacent Node B of the subframe deviations.
15. A Carrier Aggregation, CA, device for a communication system, comprising at least one computing device configured to execute program codes stored in a non-transitory storage device to performs steps in following modules:
an aggregation module, arranged to aggregate multiple Time Division Duplex (TDD) serving cells with existence of subframe deviations to obtain K Primary Cells, PCells, and M Secondary Cells, SCells, wherein K and M are positive integers, wherein the subframe deviations comprise: corresponding subframe index difference values between the TDD serving cells under a same radio frame index, or difference values of subframes where synchronization channels are located between the multiple TDD serving cells; and
a transmission module, arranged to transmit information in the multiple TDD serving cells according to the subframe deviations.
16. The device according to claim 15 , wherein existence of the subframe deviations comprises:
existence of the subframe deviations between TDD serving cells with adjacent cell indexes in the multiple TDD serving cells; or
existence of the subframe deviations between the multiple TDD serving cells and a fixed TDD serving cell, wherein the fixed TDD serving cell is a TDD serving cell in the multiple TDD serving cells;
wherein the fixed TDD serving cell is one of: a TDD serving cell serving as a PCell, a serving sell with a maximum subframe index and a TDD serving cell predefined by a transmission node.