WO2012041095A1 - Method and base station for transmitting physical downlink control channel in cross-carrier scheduling - Google Patents

Abstract

A method and a Base Station (BS) for transmitting a Physical Downlink Control Channel (PDCCH) in cross-carrier scheduling are provided in the present invention, wherein the transmission method includes that in a Frequency Division Duplex (FDD) system, the BS configures a downlink Component Carrier (CC) already configured to a User Equipment (UE) as a CC for implementing the cross-carrier scheduling for the UE, wherein the uplink CC corresponding to the downlink CC is already configured to the UE; the BS transmits a PDCCH to the UE on the downlink CC, and when the PDCCH triggers an aperiodic Channel State Information (CSI) report, the UE is instructed to transmit a Physical Uplink Shared Channel (PUSCH) scheduled by the PDCCH to the BS on the uplink CC; or, the BS transmits a PDCCH to the UE on the downlink CC, and when the PDCCH triggers an aperiodic Sounding Reference Signal (SRS), the UE is instructed to transmit the aperiodic SRS triggered by the PDCCH to the BS on the uplink CC.

Description

 Physical control for cross-carrier scheduling

 Letter tj ^ send method and account

The present invention relates to the field of communications, and in particular to a physical downlink control channel (PDCCH) transmission method and base station for cross-carrier scheduling. In the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE), a user equipment (User Equipment, UE for short) obtains a downlink channel according to a downlink reference signal (reference signal). The channel state information (CSI) is referred to, and then the obtained CSI is fed back to the base station (eNodeB, referred to as eNB for short). The base station determines, according to the CSI fed back by the UE, a modulation and coding mode, a physical resource location, and a transmission mode of data transmitted to the UE. In the LTE system, the CSI includes three types: Channel Quality Indication (CQI), Pre-coding Matrix Indicator (PMI), and Rank Indicator (RI).

In the LTE system, the CSI feedback of the downlink channel of the UE has two methods: periodic feedback and aperiodic feedback, which are respectively called periodic CSI reporting and aperiodic CSI reporting. The so-called periodic CSI report means that the UE periodically feeds back CSI according to the configuration of the base station; the so-called aperiodic 81~3⁄4 means that the base station triggers the UE to feed back the CSI once by triggering signaling. For a periodic CSI report, in general, if the UE does not send a Physical Uplink Shared Channel (PUSCH) on a certain subframe (frame), the CSI is in the physical uplink control channel (Physical Uplink Control, referred to as PUCCH). On the transmission; if the UE transmits the PUSCH, the CSI bearer is transmitted on the PUSCH. For aperiodic CSI reporting, it is only transmitted on the PUSCH. In the LTE system, the base station schedules a certain UE to send a PUSCH by using an uplink grant authorization (UPlink grant, referred to as UL grant) signaling. The uplink scheduling grant signaling may be sent to the scheduled UE by a PDCCH having Downlink Control Information (DCI) format 0 (format 0). One bit in DCI format 0 is used to trigger the UE to perform aperiodic CSI reporting, called channel quality indication request (CQI request). If the CQI request is set to 1, the UE is triggered to reverse Feed non-periodic channel status information report. That is, if the UE detects a PDCCH having its DCI format 0 format, it transmits a PUSCH according to the UL grant included therein. If the UE detects that the 1-bit CQI request in DCI format 0 is set to '1, then the aperiodic CSI is transmitted in the PUSCH scheduled by the DCI format 0. LTE-Advanced (LTE-Advanced, LTE-Advanced for short) A) The system is a next-generation evolution system of the LTE system, which uses Carrier Aggregation (CA) technology to extend the transmission bandwidth to support a larger peak transmission rate. Figure 1 is an LTE-A system according to the related art. Schematic diagram of carrier aggregation. As shown in Figure 1, each aggregated carrier is called a "Component Carrier" (referred to as CC), also known as a cell (Cell). Multiple component carriers can be located in the same frequency band. (frequency band ), which can also be located in different frequency bands. Cross-carrier scheduling is supported in the LTE-A system, that is, scheduling information of other component carriers is transmitted on a specified component carrier. Division Duplex (TDD) system, which transmits uplink and downlink scheduling information of other component carriers on a specified component carrier; Frequency Division Du a plex, abbreviated as FDD system, for transmitting scheduling information of other downlink component carriers and uplink component carriers corresponding to other downlink component carriers on a designated downlink component carrier. The specified component carrier is referred to as a component carrier for performing cross-carrier scheduling, and The PDCCH component carrier (PDCCH component carrier, hereinafter referred to as PDCCH CC). The scheduling information is sent to the scheduled UE in a PDCCH with a specific downlink control information format (DCI Format), and is scheduled for the identifier. For the component carrier, the carrier indicator field (CIF) is introduced in the DCI Format. Currently, the LTE-A system aggregates up to 5 component carriers, so the CIF is 3 bits. For a UE, is it correct? The cross-carrier scheduling, the cross-carrier scheduling on which component carrier is performed, and the component carriers that can be scheduled by the PDCCH CC for performing cross-carrier scheduling are all configured by higher layer signaling. About the signaling value in the CIF, the prior art Two schemes are mainly proposed, one is CIF value (CIF value) and the other is component carrier index (Com Ponent Carrier inde (referred to as CC index) or cell index (Cell index). In both modes, the signaling values in the CIF can be configured by higher layers. The prior art proposes that, in the LTE-A system, when configured for cross-carrier scheduling, the base station sends an aperiodic CSI report trigger command to the target UE by using a PDCCH for scheduling the PUSCH. The PDCCH for scheduling the PUSCH has a specific downlink control information format, including DCI format 0 and a PDCCH DCI format for scheduling PUSCH added in LTE-A, for example, DCI format 0', DCI Format 4 and so on. When the CQI request = 1 in the PDCCH, the UE is triggered to feed back the aperiodic CSI report. When cross-carrier scheduling, the PDCCH contains CIF information. The base station indicates, by the CIF information carried by the PDCCH, which one or a group of component carriers to trigger an aperiodic CSI report. That is, in cross-carrier scheduling, in the PDCCH for scheduling the PUSCH, if CQI request=0, the CIF information is used to indicate on which component carrier the UE is scheduled to transmit the PUSCH; and according to the prior art, when the CQI request When =1, the CIF information is used to indicate the aperiodic CSI ~3⁄4 of which component carrier or groups of component carriers are fed back. The problem is that when the CQI request=l, the UE cannot know which PDCCH the UE is scheduled to transmit on the PUSCH. In order to solve the problem, the prior art proposes: on which component carrier the PDCCH is transmitted to the UE in the TDD system, on which component carrier the UE is scheduled to transmit the PUSCH; for the FDD system, which downlink component carrier the PDCCH is on (The Downlink Component Carrier, abbreviated as DL CO, is sent to the UE, and the UE is scheduled to transmit the PUSCH on the Uplink Component Carrier (UL CC) corresponding to the downlink component carrier. In the LTE-A FDD system, each A downlink component carrier has an uplink component carrier corresponding thereto. The correspondence between the uplink and downlink component carriers is preset, and is notified to the UE by the base station by using a second type of system information block (SystemInformationBlockType2, abbreviated as SIB-2). Therefore, the correspondence between the uplink and downlink component carriers in the LTE-A FDD system is also called SIB-2 association or SIB-2 linkage, and the pair of uplink and downlink component carriers are associated with each other by SIB-2 (corresponding to The component carrier (SIB-2 linked CC). In the FDD system, the base station can configure (configure) or activate (activate) different numbers of uplink and downlink component carriers for the UE, such as As shown in Figure 2, at least one pair of UE-specific primary component carriers (PCCs), including the downlink PCC and the corresponding uplink PCC, also referred to as the primary cell (Primary) Cell, abbreviated as Pcell. The primary component carriers of different UEs may be different. In addition, in addition to a pair of primary component carriers, the base station may also configure or activate one or more secondary component carriers for the UE. And one or more uplink slave component carriers, also referred to as a secondary cell (Scell). As shown in FIG. 2, the base station may configure or activate a downlink component carrier for a certain UE (such as UE0). (For the downlink slave component carrier #2), but the UE is not configured with the uplink component carrier corresponding to the SIB-2 of the DL CC (eg, downlink slave component carrier #2) (eg, uplink slave component carrier #2). In the cross-carrier scheduling, if the downlink component carrier is configured as the PDCCH CC of the UE, when the CQI request=1 in the PDCCH transmitted on the downlink component carrier, the CIF information is only used to indicate which trigger is triggered. A non-periodic CSI report of which group of component carriers, and on which uplink component carrier the PUSCH scheduled by the PDCCH is transmitted, the UE still cannot know. In addition, the Sounding Reference Signal (SRS) is an uplink signal used by the terminal device and the base station to measure the uplink channel CSI. In the LTE system, the UE periodically transmits the SRS on the last data symbol of the transmission subframe according to the bandwidth indicated by the eNB, the frequency domain location, the sequence cyclic shift, the period, and the subframe offset. The eNB determines the CSI of the UE uplink according to the received SRS, and performs operations such as frequency domain selection scheduling and closed loop power control according to the obtained CSI. Currently, in the LTE-A system, in addition to the SRS (called periodic measurement reference signal, periodic SRS), which is reserved for the original period of the LTE, in order to improve the utilization of the SRS resource and improve the flexibility of resource scheduling, the PDCCH may also be triggered by the PDCCH. The UE transmits the SRS aperiodically (referred to as aperiodic SRS). In this way, under cross-carrier scheduling, the base station cannot indicate on which component carrier the UE transmits the triggered aperiodic SRS. Similarly, the UE cannot know which component carrier to transmit the triggered aperiodic SRS.

SUMMARY OF THE INVENTION A main object of the present invention is to provide a PDCCH transmission method and a base station for cross-carrier scheduling, to at least solve the above-mentioned LTE-A system, in a PDCCH for scheduling a PUSCH including a CIF, CQI request=l, When the CIF is used to indicate that the UE feeds back the aperiodic CSI report of the specified component carrier, the PDCCH cannot indicate the problem on which component carrier the PUSCH is scheduled to transmit, and when the PDCCH including the CIF triggers the aperiodic SRS, the PDCCH cannot be One of the problems indicating on which component carrier the aperiodic SRS it triggers is transmitted. According to an aspect of the present invention, a PDCCH transmission method for cross-carrier scheduling is provided, including: in an FDD system, a base station configures a downlink component carrier that has been configured for a UE to implement a cross-carrier scheduling component of the UE. a carrier, where the uplink component carrier corresponding to the downlink component carrier is configured to the UE; the base station sends a PDCCH to the UE on the downlink component carrier, and when the PDCCH triggers an aperiodic CSI report, indicating that the UE is in the uplink component carrier Transmitting the PUSCH scheduled by the PDCCH to the base station; or, the base station transmitting the PDCCH to the UE on the downlink component carrier, and when the PDCCH triggers the aperiodic SRS, instructing the UE to trigger the PDCCH on the uplink component carrier The aperiodic SRS is given to the base station. In the above method, the uplink component carrier is a second type of system information block of the downlink component carrier. The uplink component carrier corresponding to SIB-2. In the above method, the method further includes: in a time division duplex TDD system, the base station sends a PDCCH to the UE, and when the PDCCH triggers an aperiodic SRS, instructing the UE to send the PDCCH on a component carrier used by the PDCCH. The triggered aperiodic SRS is given to the base station. In the above method, the PDCCH that triggers the aperiodic SRS is further used to schedule the physical downlink shared channel PDSCH. In the above method, the PDCCH carries a carrier indication i or a CIF. In the case that the PDCCH is used to schedule the PUSCH and simultaneously triggers an aperiodic CSI report and an aperiodic SRS, the CIF is used to indicate that the UE feeds back the CIF. The aperiodic CSI of the indicated component carrier is reported to the base station; or the CIF is used to indicate that the UE sends the aperiodic SRS to the base station on the component carrier indicated by the CIF. According to another aspect of the present invention, a PDCCH transmission method for cross-carrier scheduling is provided, including: a base station configuring a component carrier that has been configured for a UE to implement a cross-carrier scheduling component carrier of the UE; The PDCCH is sent to the UE, and when the PDCCH triggers the aperiodic CSI report, the UE is instructed to send the PUSCH scheduled by the PDCCH to the base station on the component carrier that can be scheduled by the PDCCH; or, the base station sends the PDCCH on the component carrier. When the PDCCH triggers the aperiodic SRS, the UE is instructed to send the aperiodic SRS triggered by the PDCCH to the base station on the component carrier that the PDCCH can schedule. In the above method, in the frequency division duplex FDD system, the component carrier configured by the base station to implement the cross-carrier scheduling component carrier is a downlink component carrier that is configured for the UE, and the component carrier that can be scheduled by the PDCCH is The uplink component carrier that has been configured for the UE. In the foregoing method, before the UE sends the PUSCH scheduled by the PDCCH or the aperiodic measurement reference signal SRS triggered by the PDCCH to the base station, the UE further includes: determining, by the UE, the downlink The uplink component carrier corresponding to the component carrier is not configured for itself. In the above method, the method further includes: if the UE determines that the uplink component carrier corresponding to the downlink component carrier is configured for itself, the UE sends the PUSCH or the aperiodic SRS to the uplink component carrier corresponding to the downlink component carrier. Base station. In the above method, the uplink component carrier corresponding to the downlink component carrier is the downlink component carrier. The uplink component carrier corresponding to the second type of system information block SIB-2. In the above method, when the PDCCH triggers the aperiodic SRS, the PDCCH is used to schedule the physical downlink shared channel PDSCH. In the foregoing method, the component carrier used by the UE to send the PUSCH or the aperiodic SRS is a component carrier with the largest or smallest CIF value in the component carrier that can be scheduled by the PDCCH; or, the UE sends the PUSCH or the aperiodic The component carrier used by the SRS is a component carrier in which the component carrier index or the cell index of the component carrier that can be scheduled by the PDCCH is the largest or smallest. In the above method, the PDCCH carries a carrier indication i or a CIF; where the PDCCH is used to schedule the PUSCH, and the aperiodic channel state information CSI report and the aperiodic SRS are simultaneously triggered, the CIF is used to indicate the UE. The aperiodic CSI report of the component carrier indicated by the CIF is fed back to the base station; or the CIF is used to indicate that the UE sends the aperiodic SRS to the base station on the component carrier indicated by the CIF. According to still another aspect of the present invention, a PDCCH transmission method for cross-carrier scheduling is provided, including: a base station transmitting a PDCCH to a UE, where the PDCCH carries a CIF, and when the PDCCH triggers an aperiodic SRS, The CIF is used to instruct the UE to send the aperiodic SRS triggered by the PDCCH to the component carrier used by the base station. In the above method, the CIF is a CIF value or a component carrier index of a component carrier used by the UE to transmit the aperiodic SRS. In the above method, when the PDCCH triggers the UE to send the aperiodic SRS on a group of component carriers, the CIF is a CIF value or a component carrier index of one component carrier of the group of component carriers; or, the CIF is The group index number corresponding to the set of component carriers. In the above method, the PDCCH is further used to schedule a physical downlink shared channel (PDSCH). The method further includes: the UE transmitting the PDSCH on a component carrier that can be scheduled by the PDCCH; where the UE sends the component carrier used by the PDSCH The component carrier used for transmitting the PDCCH is the component carrier used by the UE to transmit the PDSCH is the component carrier with the largest or smallest CIF value in the component carrier that can be scheduled by the PDCCH; or the component used by the UE to transmit the PDSCH The carrier is a component carrier in which the component carrier index or the cell index of the component carrier that can be scheduled by the PDCCH is the largest or smallest. According to still another aspect of the present invention, a base station for cross-carrier scheduling is provided, including: The module is configured to configure, when the system where the base station is the FDD system, the downlink component carrier that is configured for the UE to implement the cross-carrier scheduling component carrier of the UE, where the uplink component carrier corresponding to the downlink component carrier is configured for the a sending module, configured to send a PDCCH to the UE on the downlink component carrier, when the PDCCH triggers an aperiodic CSI report, instructing the UE to send the PUSCH scheduled by the PDCCH to the base station on the uplink component carrier, or when When the PDCCH triggers the aperiodic SRS, the UE is instructed to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier. With the present invention, in the LTE-A FDD system, the base station configures only the downlink component carrier in a certain pair of uplink and downlink component carriers that have been configured to a certain UE as the PDCCH CC of the UE. When the PDCCH is sent on the downlink component carrier, and the PDCCH triggers the UE to feed back the aperiodic CSI report, the UE is instructed to send the PUSCH scheduled by the PDCCH on the uplink component carrier corresponding to the downlink component carrier; When the PDCCH is sent on the carrier, and the PDCCH triggers the UE to send the aperiodic SRS, the UE is instructed to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier corresponding to the downlink component carrier, so whether it is for the PUSCH or The aperiodic SRS, the PDCCH can all indicate that the UE transmits on the uplink component carrier that sends the downlink component carrier, and the uplink component carrier is also configured to the UE, thereby solving the foregoing LTE-A system, when the CIF is included CQI request=l in the PDCCH for scheduling the PUSCH, the CIF is used to indicate that the UE feeds back the aperiodic CSI of the specified component carrier, and the PDCCH cannot indicate the problem of which component carrier of the scheduled PUSCH is transmitted on the PDCCH and when When the PDCCH including the CIF triggers the aperiodic SRS, the PDCCH cannot indicate one of the problems of which component carrier on which the aperiodic SRS triggered is transmitted. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of carrier aggregation of an LTE-A system according to the related art; FIG. 2 is a schematic diagram of carrier aggregation of one UE of an LTE-A FDD system according to the related art; FIG. 3 is an implementation according to the present invention. FIG. 4 is a flowchart of a method for transmitting a physical downlink control channel PDCCH for cross-carrier scheduling. FIG. 4 is a physical downlink control channel for cross-carrier scheduling according to another embodiment of the present invention. FIG. 5 is a flowchart of a physical downlink control channel PDCCH transmission method for cross-carrier scheduling according to another embodiment of the present invention; FIG. 6 is a cross-carrier scheduling according to an embodiment of the present invention. Schematic diagram of the base station. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In order to solve at least one of the above two problems in the LTE-A system of the prior art, the following embodiments of the present invention provide a new physical downlink control channel (PDCCH) transmission method for cross-carrier scheduling, which mainly includes The following implementation methods. FIG. 3 is a flowchart of a method for transmitting a PDCCH for cross-carrier scheduling according to an embodiment of the present invention, including the following steps: Step S302: In an FDD system, a base station configures a certain PDCCH to a certain UE. A downlink component carrier is configured to implement a cross-carrier scheduling component carrier (ie, FDCCH CC) of the UE, where the downlink component carrier corresponds to an uplink component carrier (specifically, the SIB-2 corresponding to the downlink component carrier (or associated) The uplink component carrier is configured for the UE; that is, in the LTE-A FDD system, for a certain downlink component carrier of a certain UE, if the uplink component carrier corresponding to the SIB-2 is not configured for the UE, The downlink component carrier cannot be configured as the PDCCH CC of the UE, that is, the PDCCH that the base station sends to the UE on the downlink component carrier cannot schedule the UE to receive the PDSCH on other downlink component carriers or on other uplink component carriers. The PUSCH is transmitted, or the base station does not send the PDCCH to the UE on the downlink component carrier. That is, in the LTE-A FDD system, a certain downlink component carrier is to be configured as a PDCCH CC of a certain UE, and an uplink component carrier corresponding to the SIB-2 must be configured to the UE. Step S304, the base station sends a PDCCH to the UE on the downlink component carrier, and the PDCCH triggers the UE to feed back the aperiodic CSI report, and then instructs the UE to send the PUSCH scheduled by the PDCCH to the base station on the uplink component carrier. Obviously the PDCCH is used to schedule the PUSCH and the The PDCCH carries a carrier indication field CIF, and the CIF is used to indicate that the UE feeds back an aperiodic CSI of the component carrier indicated by the CIF. Alternatively, in step S304, the base station sends a PDCCH on the downlink component carrier. Sending to the UE, the PDCCH triggering the UE to send the aperiodic SRS, and instructing the UE to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier. If the PDCCH is used to schedule the PUSCH, the CIF is used to indicate on which uplink component carrier the UE transmits the PUSCH; if the PDCCH is used to schedule the PDSCH, the CIF is used to indicate which downlink component carrier the UE is on. Receive the PDSCH). In this embodiment, in the LTE-A FDD system, the base station configures only the downlink component carrier in a certain pair of uplink and downlink component carriers that have been configured to a certain UE as the PDCCH CC of the UE. When the PDCCH is sent on the downlink component carrier, and the PDCCH triggers the UE to feed back the aperiodic CSI report, the UE is instructed to send the PUSCH scheduled by the PDCCH on the uplink component carrier corresponding to the downlink component carrier; When the PDCCH is sent on the carrier, and the PDCCH triggers the UE to send the aperiodic SRS, the UE is instructed to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier corresponding to the downlink component carrier, so whether it is for the PUSCH or The aperiodic SRS, the PDCCH can all indicate that the UE transmits on the uplink component carrier that sends the downlink component carrier, and the uplink component carrier is also configured to the UE, thereby solving the foregoing LTE-A system, when the CIF is included CQI request=l in the PDCCH for scheduling the PUSCH, the CIF is used to indicate that the UE feeds back the aperiodic CSI of the specified component carrier, and the PDCCH cannot indicate the problem of which component carrier of the scheduled PUSCH is transmitted on the PDCCH and when When the PDCCH including the CIF triggers the aperiodic SRS, the PDCCH cannot indicate one of the problems of which component carrier on which the aperiodic SRS triggered is transmitted.

(1) For PUSCH:

In the LTE-A FDD system, when CQI request=1 (indicating that the PDCCH triggers the aperiodic CSI report:) in the PDCCH for scheduling the PUSCH including the CIF, the PUSCH scheduled by the PDCCH corresponds to the downlink component carrier that transmits the PDCCH. The uplink component is transmitted on the carrier. The uplink component carrier corresponding to the downlink component carrier is an uplink component carrier associated with the downlink component carrier SIB-2.

In the LTE-A TDD system, when CQI request=1 in the PDCCH for scheduling the PUSCH including the CIF, the PUSCH scheduled by the PDCCH is transmitted on the component carrier that transmits the PDCCH. The implementation of the PDCCH for scheduling a PUSCH by using the CIF in its scheduled UE The cross-carrier scheduled component carrier is transmitted on the PDCCH CC.

(2) For aperiodic SRS:

In the LTE-A FDD system, when the PDCCH including the CIF triggers the aperiodic SRS, the aperiodic SRS triggered by the PDCCH is transmitted on the uplink component carrier corresponding to the downlink component carrier that transmits the PDCCH. The uplink component carrier corresponding to the downlink component carrier is an uplink component carrier associated with the downlink component carrier SIB-2. That is, in the LTE-A FDD system, when the PDCCH for scheduling the PDSCH including the CIF triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the downlink component carrier where the PDSCH scheduled by the PDCCH is located. The aperiodic SRS triggered by the PDCCH is sent on the uplink component carrier corresponding to the downlink component carrier that sends the PDCCH.

In the LTE-A TDD system, when the PDCCH including the CIF triggers the aperiodic SRS, the aperiodic SRS triggered by the PDCCH is transmitted on the component carrier that transmits the PDCCH. Preferably, the PDCCH triggering the aperiodic SRS is used to schedule the PDSCH. That is, in the LTE-A TDD system, when the PDCCH for scheduling the PDSCH including the CIF triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier in which the PDSCH scheduled by the PDCCH is located. The aperiodic SRS triggered by the PDCCH is sent on the component carrier that sends the PDCCH. Embodiment 1

In the LTE-A FDD system, the base station configures a pair of primary component carriers DL CC0 and UL CCO for a certain UE, 1 pair of slave component carriers DL CC1 and UL CC1, and 2 downlink slave component carriers DL CC2 and DL CC3 (its The SIB-2 associated uplink slave component carriers UL CC2 and UL CC3 are not configured for the UE). Under the cross-carrier scheduling, only DL CC0 or DL CC1 can be configured as the PDCCH CC of the UE, and DL CC2 or DL CC3 cannot be configured as the PDCCH CC of the UE. If the DL CCO is configured as a PDCCH CC for the UE, and the PDCCH transmitted on the DL CCO can schedule DL CCO and UL CCO, DL CCl and UL CCl , and DL CC2 and DL CC3. When the UE detects the PDCCH for scheduling the PUSCH on the DL CCO, and the CQI request = 1 , the CIF included in the PDCCH is used to indicate that the UE feeds back the specified component. Aperiodic CSI reporting of the carrier. The PDCCH scheduling UE transmits a PUSCH on UL CC0. If the DL CC0 is configured as a PDCCH CC for the UE, and the PDCCH transmitted on the DL CC0 can schedule DL CC0 and UL CC0 , DL CC1 and UL CC1 , and DL CC2 and DL CC3. When the UE detects the PDCCH for scheduling the PDSCH on the DL CC0, and the PDCCH triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier where the PDSCH scheduled by the PDCCH is located. The PDCCH triggers the UE to send an aperiodic SRS on UL CC0. FIG. 4 is a flowchart of a method for transmitting a physical downlink control channel PDCCH for cross-carrier scheduling according to another embodiment of the present invention, including the following steps: Step S402: A base station configures a component carrier that has been configured for a certain UE Performing cross-carrier scheduling of the component carrier for the UE; Step S404, the base station sends a PDCCH to the UE on the component carrier, and when the PDCCH triggers the UE to feed back the aperiodic CSI report, indicating that the UE can be scheduled in the PDCCH Transmitting the PUSCH scheduled by the PDCCH on the component carrier, or when the PDCCH triggers the UE to send the aperiodic SRS, instructing the UE to send the aperiodic SRS triggered by the PDCCH to the base station on one component carrier that the PDCCH can schedule. Obviously, in the FDD system, one of the component carriers in the step S402 should be a downlink component carrier, and one component carrier that can be scheduled by the PDCCH in step S404 should be an uplink component carrier that has been configured for the UE. In this embodiment, the PDCCH sent to the UE indicates that the UE transmits the PUSCH scheduled by the PDCCH or the aperiodic SRS triggered by the PDCCH to the base station on one component carrier that the PDCCH can schedule, thereby being in the FDD system. In the TDD system, the UE can correctly transmit the PUSCH or the aperiodic SRS by using one component carrier that can be scheduled by the received PDCCH, so that one of the above two problems existing in the prior art can be well solved. The embodiment shown in FIG. 4 may include the following method two to method four. Method 2 (does not distinguish between TDD/FDD systems)

(1) For PUSCH:

In the LTE-A system, when one component carrier is configured as a PDCCH CC of a certain UE, if If the CQI request=1 in the PDCCH for scheduling the PUSCH transmitted on the component carrier is sent, the PUSCH scheduled by the PDCCH is transmitted on one component carrier that can be scheduled by the PDCCH CC. The component carrier that can be scheduled by the PDCCH CC refers to a component carrier that can be scheduled by the PDCCH that is sent by the UE on its PDCCH CC. Preferably, the component carrier transmitting the PUSCH is one component carrier having the largest or smallest CIF value (CIF value) in the component carrier that can be scheduled by the PDCCH CC; or the component carrier transmitting the PUSCH is the PDCCH CC The component carrier that can be scheduled, the component carrier index (CC index ) or the cell index (Cell index), the largest or smallest component carrier. In this way, the UE can transmit the PUSCH on the above component carrier. That is, in the LTE-A system, if CQI request=1 in the PDCCH for scheduling the PUSCH including the CIF, the PUSCH scheduled by the PDCCH is transmitted on one component carrier that can be scheduled by the component carrier that transmits the PDCCH. The component carrier that transmits the PUSCH is one component carrier with the largest or smallest CIF value (CIF value) in the component carrier that can be scheduled by the component carrier that sends the PDCCH; or, the component carrier that sends the PUSCH is the sending station. The component carrier that can be scheduled by the component carrier of the PDCCH is the component carrier index (CC index ) or the cell index (Cell index), which is the largest or smallest component carrier.

(2) Aperiodic SRS:

In the LTE-A system, when one downlink component carrier is configured as a PDCCH CC of a certain UE, if the PDCCH transmitted on the component carrier triggers an aperiodic SRS, the aperiodic SRS triggered by the PDCCH can be performed by the PDCCH CC. Sent on one component carrier of the schedule. Preferably, the component carrier that transmits the aperiodic SRS is one component carrier with the largest or smallest CIF value (CIF value) in the component carrier that can be scheduled by the PDCCH CC; or, the component carrier that sends the aperiodic SRS is The component carrier that can be scheduled by the PDCCH CC, the component carrier index (CC index ) or the cell index (Cell index), the largest or smallest component carrier. In this way, the UE can transmit the aperiodic SRS on the above component carrier. Preferably, the PDCCH triggering the aperiodic SRS is used to schedule the PDSCH. That is, in the LTE-A system, when the PDCCH for scheduling the PDSCH including the CIF triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier in which the PDSCH scheduled by the PDCCH is located. The aperiodic SRS triggered by the PDCCH is sent on one component carrier that can be scheduled by the component carrier that sends the PDCCH. The component carrier that sends the aperiodic SRS is And transmitting, by the component carrier that can be scheduled by the component carrier of the PDCCH, a component carrier with a CIF value (CIF value) that is the largest or smallest; or, the component carrier that sends the aperiodic SRS is capable of scheduling the component carrier that sends the PDCCH. The component carrier (CC index ) or the cell index (Cell index) of the component carrier is the largest or smallest component carrier. Embodiment 2

In the LTE-A FDD system, the base station configures a pair of primary component carriers DL CC0 and UL CCO for a certain UE, 1 pair of slave component carriers DL CC1 and UL CC1, and 2 downlink slave component carriers DL CC2 and DL CC3 (its The SIB-2 associated uplink slave component carriers UL CC2 and UL CC3 are not configured for the UE). (1) If the UE is configured, DL CC0 is configured as a PDCCH CC, and is sent on the DL CCO.

The PDCCH is to schedule DL CC0 and UL CCO, DL CC1 and UL CC1 , and DL CC2 and DL CC3. When the UE detects the PDCCH for scheduling the PUSCH on the DL CCO, and the CQI request = 1 , the CIF included in the PDCCH is used to indicate that the UE feeds back the aperiodic CSI report of the specified component carrier. The PDCCH scheduling UE transmits the PUSCH on the UL CC0 with the smallest component carrier index in the uplink component carrier that can be scheduled by the DL CC0. When the UE detects the PDCCH for scheduling the PDSCH on the DL CCO, and the PDCCH triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier where the PDSCH scheduled by the PDCCH is located. The PDCCH triggers the UE to send the aperiodic SRS on the UL CC0 with the smallest component carrier index in the uplink component carrier that can be scheduled by the DL CC0.

(2) If the DL CC1 is configured as a PDCCH CC for the UE, and the PDCCH transmitted on the DL CCl is scheduled to DL CC0 and UL CCO, DL CC1 and UL CC1, and DL CC2 and DL CC3. When the UE detects the PDCCH for scheduling the PUSCH on the DL CCl, and the CQI request = 1 , the CIF included in the PDCCH is used to indicate that the UE feeds back the aperiodic CSI report of the specified component carrier. The PDCCH scheduling UE transmits the PUSCH on the UL CC0 with the smallest component carrier index in the uplink component carrier that can be scheduled by the DL CC1. When the UE detects the PDCCH for scheduling the PDSCH on the DL CCl, and the PDCCH triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the PDCCH. The component carrier where the scheduled PDSCH is located. The PDCCH triggers the UE to send the aperiodic SRS on the UL CC0 with the smallest component carrier index in the uplink component carrier that can be scheduled by the DL CC1.

(3) If the DL CC1 is configured as a PDCCH CC for the UE, and the PDCCH transmitted on the DL CC1 can only schedule DL CC1 and UL CC1, DL CC2 and DL CC3. When the UE detects a PDCCH for scheduling PUSCH belonging to it on DL CC1, and wherein

CQI request = 1 , then the CIF is used to indicate that the UE feeds back the aperiodic CSI report of the specified component carrier. The PDCCH scheduling UE transmits the PUSCH on the UL CC1 with the smallest component carrier index in the uplink component carrier that can be scheduled by the DL CC1. When the UE detects the PDCCH for scheduling the PDSCH on the DL CC1, and the PDCCH triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier where the PDSCH scheduled by the PDCCH is located. The PDCCH scheduling UE transmits the aperiodic SRS on the UL CC1 with the smallest component carrier index in the uplink component carrier that can be scheduled by the DL CC1. Embodiment 3

In the LTE-A TDD system, the base station configures one primary component carrier CC0 and three slave component carriers CC1, CC2 and CC3 for the UE.

(1) If the UE is configured with CC2 as the PDCCH CC, and the PDCCH transmitted on CC2 can schedule CC0 (its CIF value is 2), CC1 (its CIF value is 3), CC2 (its CIF value is 0 CC3 ( Its CIF value is 1). When the UE detects its PDCCH for scheduling PUSCH on CC2, and where CQI request = 1, the CIF is used to indicate that the UE feeds back the aperiodic CSI report of the specified component carrier. The PDCCH scheduling UE transmits the PUSCH on the CC1 with the largest CIF value in the component carrier that can be scheduled by the CC2. When the UE detects the PDCCH for scheduling the PDSCH that belongs to it on the CC2, and the PDCCH triggers the aperiodic SRS, the PDCCH The CIF included in the CIF is used to indicate the component carrier where the PDSCH scheduled by the PDCCH is located, and the PDCCH scheduling UE sends the aperiodic SRS on the CC1 with the largest CIF value among the component carriers that can be scheduled by the CC2.

(2) If the UE is configured to configure CC2 as a PDCCH CC, and the PDCCH transmitted on CC2 can schedule CC1 (its CIF value is 1;), CC2 (its CIF value is 0;), CC3 (its CIF value is 2) )„ When the UE detects the PDCCH for scheduling the PUSCH that belongs to it on CC2, and where CQI request = 1, the CIF is used to indicate that the UE feeds back the aperiodic CSI report of the specified component carrier. The PDCCH scheduling UE transmits the PUSCH on the CC3 with the largest CIF value among the component carriers that can be scheduled by the CC2. When the UE detects the PDCCH for scheduling the PUSCH on the CC2, and the PDCCH triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier where the PDSCH scheduled by the PDCCH is located. The PDCCH scheduling UE sends an aperiodic SRS on CC3 with the largest CIF value among the component carriers that can be scheduled by CC2. Method 3 (distinguish between TDD/FDD systems) (1) For PUSCH:

In the LTE-A FDD system, when one downlink component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling of a certain UE, if CQI request=l in the PDCCH for scheduling the PUSCH transmitted on the downlink component carrier, Then, the PUSCH scheduled by the PDCCH is transmitted on one uplink component carrier that the PDCCH CC can schedule. Preferably, the uplink component carrier is one uplink component carrier with the largest or smallest CIF value in the uplink component carrier that can be scheduled by the PDCCH CC; or the uplink component carrier is capable of the PDCCH CC The uplink component carrier has a component carrier index (CC index ) or a cell index (Cell index) of the largest or smallest uplink component carrier. In this way, the UE can transmit the PUSCH on the uplink component carrier. In the LTE-A TDD system, when one component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling of a certain UE, if CQI request=l in the PDCCH for scheduling the PUSCH transmitted on the component carrier, The PUSCH scheduled by the PDCCH is transmitted on a component carrier that transmits the PDCCH. That is, in the LTE-A FDD system, if CQI request=1 in the PDCCH for scheduling the PUSCH including the CIF, the PUSCH scheduled by the PDCCH is an uplink component carrier that can be scheduled by the downlink component carrier that transmits the PDCCH. Send on. The uplink component carrier that sends the PUSCH is an uplink component carrier with the largest or smallest CIF value (CIF value) in the uplink component carrier that can be scheduled by the downlink component carrier of the PDCCH; or the uplink of the PUSCH is sent. The component carrier is a maximum or minimum uplink component of a component carrier index (CC index ) or a cell index (Cell index) of an uplink component carrier that can be scheduled by the downlink component carrier that transmits the PDCCH. Quantity carrier.

In the LTE-A TDD system, when CQI request=1 in the PDCCH for scheduling PUSCH including CIF, the PUSCH scheduled by the PDCCH is transmitted on the component carrier that transmits the PDCCH.

(2) Aperiodic SRS: In the LTE-A FDD system, when one downlink component carrier is configured as a component carrier PDCCH CC that performs cross-carrier scheduling for a certain UE, if the PDCCH transmitted on the downlink component carrier triggers an aperiodic SRS The aperiodic SRS triggered by the PDCCH is sent on an uplink component carrier that the PDCCH CC can schedule. Preferably, the uplink component carrier is one uplink component carrier with the largest or smallest CIF value in the uplink component carrier that can be scheduled by the PDCCH CC; or the uplink component carrier is capable of the PDCCH CC The uplink component carrier has a component carrier index (CC index ) or a cell index (Cell index) of the largest or smallest uplink component carrier.

In the LTE-A TDD system, when one component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling of a certain UE, if the PDCCH transmitted on the component carrier triggers an aperiodic SRS, the aperiodic SRS triggered by the PDCCH Transmitted on the PDCCH CC. Preferably, the PDCCH triggering the aperiodic SRS is used to schedule the PDSCH. That is, in the LTE-A FDD system, when the PDCCH for scheduling the PDSCH including the CIF triggers the aperiodic SRS, the CIF included in the PDCCH is used to indicate the downlink component carrier where the PDSCH scheduled by the PDCCH is located. The aperiodic SRS triggered by the PDCCH is sent on the uplink component carrier corresponding to the downlink component carrier that sends the PDCCH.

In the LTE-A TDD system, when the PDCCH for scheduling the PDSCH including the CIF triggers the non-periodic SRS, the CIF included in the PDCCH is used to indicate the component carrier in which the PDSCH scheduled by the PDCCH is located. The aperiodic SRS triggered by the PDCCH is transmitted on the component carrier that transmits the PDCCH. Method four

(1) For PUSCH:

In the LTE-A FDD system, when one downlink component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling of a certain UE, if the downlink component carrier is used for scheduling the PUSCH The CQI request=1 in the PDCCH is performed according to the following two cases: Case 1: If the PDCCH CC corresponds to the uplink component carrier (specifically, the downlink component carrier SIB-2 associated (or corresponding) uplink may be The component carrier is configured to transmit to the UE, the PUSCH scheduled by the PDCCH is sent on the uplink component carrier; Case 2: if the uplink component carrier corresponding to the PDCCH CC is not configured to the UE, then the PDCCH CC The PUSCH scheduled by the PDCCH is transmitted on one uplink component carrier that can be scheduled. Preferably, the uplink component carrier is one uplink component carrier with the largest or smallest CIF value in the uplink component carrier that can be scheduled by the PDCCH CC; or the uplink component carrier is capable of the PDCCH CC The uplink component carrier has a component carrier index (CC index ) or a cell index (Cell index) of the largest or smallest uplink component carrier.

In the LTE-A TDD system, when one component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling of a certain UE, if CQI request=l in the PDCCH for scheduling the PUSCH transmitted on the component carrier, The PUSCH scheduled by the PDCCH is transmitted on a component carrier that transmits the PDCCH.

(2) Aperiodic SRS:

In the LTE-A FDD system, under the cross-carrier scheduling, when one downlink component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling of a certain UE, if the PDCCH transmitted on the downlink component carrier triggers an aperiodic SRS, Performing the following two cases: Case 1: If the uplink component carrier corresponding to the PDCCH CC (specifically, the uplink component carrier associated with the downlink component carrier SIB-2) is configured for the UE, the uplink component is Transmitting the aperiodic SRS triggered by the PDCCH on the carrier; Case 2: if the uplink component carrier corresponding to the PDCCH CC is not configured to the UE, transmitting the PDCCH on an uplink component carrier that can be scheduled by the PDCCH CC The triggered aperiodic SRS is: the uplink component carrier is an uplink component carrier with the largest or smallest CIF value in the uplink component carrier that can be scheduled by the PDCCH CC; or, the uplink component carrier is An uplink component carrier in which the component carrier index (CC index ) or the cell index (Cell index) of the uplink component carrier that can be scheduled by the PDCCH CC is the largest or smallest. In the LTE-A TDD system, when one component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling of a certain UE, if the PDCCH transmitted on the component carrier triggers an aperiodic SRS, the aperiodic SRS triggered by the PDCCH Transmitted on the PDCCH CC. In summary, in the foregoing method 4, the PUSCH scheduled by the PDCCH or the aperiodic triggered by the PDCCH is sent on the component carrier that the UE can schedule on the PDCCH in the step 4 S S404 shown in FIG. Before the SRS is sent to the base station, the UE needs to first determine whether the uplink component carrier corresponding to the downlink component carrier has been configured to itself. If it is determined that the uplink component carrier corresponding to the downlink component carrier is configured to itself, the UE is in the downlink component. The PUSCH or the aperiodic SRS is sent to the base station on the uplink component carrier corresponding to the carrier. If it is determined that it is not configured for itself, the PUSCH or the aperiodic SRS is sent to the base station on the component carrier that can be scheduled by the PDCCH. Method 5 is a flowchart of a method for transmitting a physical downlink control channel PDCCH for cross-carrier scheduling according to another embodiment of the present invention, including the following steps: Step S502: A base station sends a PDCCH to a UE, where the PDCCH carries There is a CIF. When the PDCCH triggers the UE to send an aperiodic SRS, the CIF is used to indicate that the UE sends the aperiodic SRS triggered by the PDCCH to the component carrier used by the base station. That is, the UE transmits an aperiodic SRS on the component carrier indicated by the CIF. Obviously, in the FDD system, in step S502, the base station sends a PDCCH to the UE to use one downlink component carrier that is configured for the UE, and the UE sends the aperiodic SRS triggered by the PDCCH to the base station. An uplink component carrier configured for the UE. Specifically, when the PDCCH including the CIF triggers the UE to send an aperiodic SRS, the CIF instructs the UE to send the aperiodic SRS on the specified component carrier. Preferably, the CIF indicates a CIF value or a component carrier index of a component carrier that transmits an aperiodic SRS. Preferably, when the PDCCH triggers the UE to send an aperiodic SRS on a group of component carriers, the CIF indicates a CIF value or a component carrier index of one of the group of component carriers. Preferably, the CIF indicates a group index number corresponding to a group of component carriers that transmit the aperiodic SRS. Preferably, the set of component carriers refers to all configured component carriers (activated) or activated (for TDD systems), or all uplink component carriers configured or activated by the UE (for FDD) system). Preferably, the set of component carriers refers to a partial component carrier (for a TDD system) configured or activated by the UE, or a partial uplink component carrier (for an FDD system) configured or activated by the UE. Preferably, the set of component carriers is preset or configured by a higher layer. Preferably, the set of component carriers refers to component carriers in the component carriers configured or activated by the UE that satisfy a certain preset relationship. For example, a group of component carriers is a component carrier of a component carrier index number modulo 2 congruence (ie, the same remainder after 2 modulo) in the component carrier configured or activated by the UE. For another example, a set of component carriers is a component carrier of the uplink component carrier configured or activated by the UE that can be scheduled by the same component carrier. For another example, the group of component carriers refers to component carriers located in the same frequency band among the component carriers configured or activated by the UE. In particular, if the UE only configures or activates one component carrier on a certain frequency band, the group of component carriers includes only the one component carrier. For example, the group of component carriers refers to a component carrier that shares the same radio frequency link (RF Chain) in the component carriers that are configured or activated by the UE. In particular, if only one component carrier is configured or activated on a certain radio frequency link of the UE, the group of component carriers includes only the one component carrier.

In the LTE-A system, when one component carrier is configured as a PDCCH CC of a certain UE, if a PDCCH for scheduling a PDSCH transmitted on the component carrier triggers an aperiodic SRS, the component carrier of the PDCCH scheduling is the PDCCH CC One component carrier that can be scheduled, that is, the PDSCH scheduled by the PDCCH is transmitted on one component carrier that the PDCCH CC can schedule. Obviously, in the FDD system, the component carrier configured to implement the cross-carrier scheduling component carrier is a downlink component carrier that has been configured for the UE, and the component carrier that can be scheduled by the PDCCH is a downlink component carrier that has been configured for the UE. Preferably, the component carrier that sends the PDSCH is the PDCCH CC; or the component carrier that sends the PDSCH is one component carrier with the largest or smallest CIF value (CIF value) in the component carrier that the PDCCH CC can schedule. Or, the component carrier that sends the PDSCH is one component carrier whose component carrier index (CC index ) or cell index (Cell index) of the component carrier that can be scheduled by the PDCCH CC is the largest or smallest. It is worth noting here that in the foregoing embodiments shown in FIG. 3 to FIG. 5 (including the foregoing method 1 to method 5), when the PDCCH including the CIF is sent to schedule the PUSCH and simultaneously trigger the aperiodic CSI of a certain UE. When reporting and aperiodic SRS, the CIF in the PDCCH is used to indicate that the UE feeds back the aperiodic CSI of the specified component carrier or to instruct the UE to send the aperiodic SRS on the specified component carrier. And, when the PDCCH for scheduling the PUSCH that includes the CIF triggers both the aperiodic CSI report and the aperiodic SRS, the PUSCH scheduled by the PDCCH and the triggered aperiodic SRS are transmitted on the same component carrier. The PDCCH for scheduling the PUSCH triggers an aperiodic SRS, and the PUSCH scheduled by the PDCCH and the triggered aperiodic SRS are transmitted on the same component carrier. FIG. 6 is a schematic diagram of a base station for cross-carrier scheduling according to an embodiment of the present invention, including the following module: The configuration module 10 is configured to configure, when the system where the base station is located, an FDD system, configure a downlink component carrier that is configured for the UE to The UE performs the cross-carrier scheduling component carrier, where the uplink component carrier corresponding to the downlink component carrier is configured to the UE, and the sending module 20 is configured to send the PDCCH to the UE on the downlink component carrier, when the PDCCH triggers a non- When the period CSI is "^^", the UE is instructed to send the PUSCH scheduled by the PDCCH to the base station on the uplink component carrier, or when the PDCCH triggers the aperiodic SRS, the UE is instructed to send the PDCCH on the uplink component carrier. The triggered aperiodic SRS is sent to the base station. From the above description, it can be seen that the present invention achieves the following technical effects: whether in the FDD system or the TDD system, or for the PUSCH or the aperiodic SRS, the PDCCH transmitted by the base station can indicate on which component carrier the UE transmits. The PUSCH scheduled by the PDCCH or the aperiodic SRS triggered by the PDCCH can be used to solve the above LTE-A system. When the PDCCH for scheduling the PUSCH including the CIF is CQI request=l, the CIF is used to indicate the UE feedback. The aperiodic CSI of the specified component carrier, the PDCCH cannot indicate that its scheduled PUSCH is The problem of which component carrier is transmitted and when the PDCCH including the CIF triggers the aperiodic SRS, the PDCCH cannot indicate the question of which component carrier the aperiodic SRS triggered by is transmitted on.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim A physical downlink control channel PDCCH transmission method for cross-carrier scheduling, comprising: configuring, in a frequency division duplex FDD system, a downlink component carrier that has been configured for a user equipment UE to implement cross-carrier implementation of the UE Scheduling a component carrier, where an uplink component carrier corresponding to the downlink component carrier is configured to the UE;  The base station sends a PDCCH to the UE on the downlink component carrier, and when the PDCCH triggers the aperiodic channel state information CSI, the UE is instructed to send the PDCCH scheduled physicality on the uplink component carrier. And transmitting, by the base station, the PDCCH to the UE on the downlink component carrier, and when the PDCCH triggers the aperiodic measurement reference signal SRS, indicating that the UE is in the uplink component The aperiodic SRS triggered by the PDCCH is sent to the base station on a carrier. The method according to claim 1, wherein the uplink component carrier is an uplink component carrier corresponding to the second type system information block SIB-2 of the downlink component carrier. 3. The method according to claim 1, further comprising:  In a time division duplex TDD system, the base station sends a PDCCH to the UE, and when the PDCCH triggers an aperiodic SRS, the UE is instructed to send the PDCCH by using the component carrier used by the PDCCH. The aperiodic SRS is given to the base station. The method according to claim 1 or 3, wherein the PDCCH that triggers the aperiodic SRS is further used to schedule a physical downlink shared channel PDSCH. The method according to claim 1, wherein the PDCCH carries a carrier indication field CIF; when the PDCCH is used to schedule the PUSCH, and simultaneously triggers an aperiodic CSI and an aperiodic SRS,  The CIF is used to indicate that the UE feeds back an aperiodic CSI report of the component carrier indicated by the CIF to the base station; or the CIF is used to indicate that the UE sends the component carrier indicated by the CIF. The aperiodic SRS is given to the base station. A method for transmitting a physical downlink control channel PDCCH for cross-carrier scheduling, comprising: configuring, by a base station, a component carrier that has been configured for a user equipment UE to implement a cross-carrier scheduling component carrier of the UE; The base station sends a PDCCH to the UE on the component carrier, and when the PDCCH triggers the aperiodic channel state information CSI, the UE is instructed to send the PDCCH on the component carrier that the PDCCH can schedule. The scheduled physical uplink shared channel PUSCH is sent to the base station; or the base station sends a PDCCH to the UE on the component carrier, and when the PDCCH triggers the aperiodic measurement reference signal SRS, indicating that the UE is in the The aperiodic SRS triggered by the PDCCH is sent to the base station on a component carrier that can be scheduled by the PDCCH. The method according to claim 6, wherein in the frequency division duplex FDD system, the component carrier configured by the base station to implement the cross-carrier scheduling component carrier is a downlink component carrier configured to the UE And the component carrier that can be scheduled by the PDCCH is an uplink component carrier that is configured to the UE. The method according to claim 7, wherein, before the UE sends the aperiodic measurement reference signal SRS triggered by the PDCCH to the base station, the method further includes:  The UE determines that the uplink component carrier corresponding to the downlink component carrier is not configured to itself. 9. The method according to claim 8, further comprising:  If the UE determines that the uplink component carrier corresponding to the downlink component carrier has been configured to itself, the UE sends the PUSCH or the aperiodic SRS to the base station on an uplink component carrier corresponding to the downlink component carrier. . 10. The method according to claim 8, wherein the uplink component carrier corresponding to the downlink component carrier is an uplink component carrier corresponding to the second type system information block SIB-2 of the downlink component carrier. The method according to claim 6, wherein, in a case that the PDCCH triggers the aperiodic SRS, the PDCCH is used to schedule a physical downlink shared channel PDSCH. The method according to any one of claims 6 to 11, wherein The component carrier used by the UE to send the PUSCH or the aperiodic SRS is a component carrier with the largest or smallest CIF value among the component carriers that can be scheduled by the PDCCH; or The component carrier used by the UE to send the PUSCH or the aperiodic SRS is a component carrier in which a component carrier index or a cell index of the component carrier that can be scheduled by the PDCCH is the largest or smallest. The method according to claim 6, wherein the PDCCH carries a carrier indication domain CIF; the PDCCH is used to schedule the PUSCH, and simultaneously triggers aperiodic channel state information CSI and aperiodic SRS In case,  The CIF is used to indicate that the UE feeds back an aperiodic CSI report of the component carrier indicated by the CIF to the base station; or the CIF is used to indicate that the UE sends the component carrier indicated by the CIF. The aperiodic SRS is given to the base station. A method for transmitting a physical downlink control channel (PDCCH) for cross-carrier scheduling, comprising: transmitting, by a base station, a PDCCH to a user equipment UE, where the PDCCH carries a carrier indication field CIF, and when the PDCCH triggers an aperiodic measurement reference When the signal is SRS, the CIF is used to indicate that the UE sends the aperiodic SRS triggered by the PDCCH to the component carrier used by the base station. The method according to claim 14, wherein the CIF is a CIF value or a component carrier index of a component carrier used by the UE to send the non-periodic SRS. 16. The method according to claim 14, wherein, when the PDCCH triggers the UE to send the aperiodic SRS on a group of component carriers,  The CIF is a CIF value or a component carrier index of one of the component carriers; or  The CIF is a group index number corresponding to the set of component carriers. The method according to claim 14, wherein the PDCCH is further configured to schedule a physical downlink shared channel PDSCH; the method further includes:  Transmitting, by the UE, the PDSCH on a component carrier that can be scheduled by the PDCCH; where, the component carrier used by the UE to send the PDSCH is a component carrier that sends the PDCCH; or The component carrier used by the UE to send the PDSCH is a component carrier with the largest or smallest CIF value in the component carrier that can be scheduled by the PDCCH; or The component carrier used by the UE to send the PDSCH is a component carrier index or a component carrier with the largest or smallest cell index in the component carrier that can be scheduled by the PDCCH. A base station for cross-carrier scheduling includes:  a configuration module, configured to: when the system in which the base station is located is a frequency division duplex FDD system, configure a downlink component carrier that is configured to the user equipment UE to implement a cross-carrier scheduling component carrier of the UE, where the downlink is The uplink component carrier corresponding to the component carrier is configured to the UE;  a sending module, configured to send a physical downlink control channel PDCCH to the UE on the downlink component carrier, and when the PDCCH triggers a non-periodic channel state information CSI report, instructing the UE to send the uplink component carrier The physical uplink shared channel PUSCH scheduled by the PDCCH is sent to the base station, or when the PDCCH triggers the aperiodic measurement reference signal SRS, indicating that the UE sends the acyclic periodic SRS triggered by the PDCCH on the uplink component carrier. To the base station.