CN101958772A - Physical downlink control channel sending method and base station for cross-carrier scheduling - Google Patents

Physical downlink control channel sending method and base station for cross-carrier scheduling Download PDF

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CN101958772A
CN101958772A CN2010105025331A CN201010502533A CN101958772A CN 101958772 A CN101958772 A CN 101958772A CN 2010105025331 A CN2010105025331 A CN 2010105025331A CN 201010502533 A CN201010502533 A CN 201010502533A CN 101958772 A CN101958772 A CN 101958772A
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pdcch
component carrier
base station
cif
carrier
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CN101958772B (en
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朱鹏
左志松
喻斌
戴博
吴欣
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2011/076596 priority patent/WO2012041095A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path

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  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a PDCCH (Physical Downlink Control Channel) sending method and a base station for cross-carrier scheduling. The method comprises the following steps that: in FDD (Frequency Division Duplex) system, the base station configures a downlink component carrier configured to UE (User Equipment) as a component carrier of the UE for implementing cross-carrier scheduling, wherein the uplink component carrier corresponding to the downlink component carrier is configured to the UE; the base station sends PDCCH to the UE on the downlink component carrier; the UE sends PUSCH (Physical Uplink Shared Channel) scheduled by the PDCCH to the base station on the uplink component carrier when the PDCCH triggers an aperiodic CSI (Channel State Information) report; or, the base station sends PDCCH to the UE on the downlink component carrier; and the UE sends SRS (Sounding Reference Signal) triggered by the PDCCH to the base station on the uplink component carrier when the PDCCH triggers an aperiodic SRS report.

Description

Physical downlink control channel sending method and base station for cross-carrier scheduling
Technical Field
The present invention relates to the field of communications, and in particular, to a Physical Downlink Control Channel (PDCCH) sending method and a base station for cross-carrier scheduling.
Background
In The third generation partnership Project Long Term Evolution system (3 GPP LTE), a User Equipment (UE) obtains Channel State Information (CSI) of a downlink Channel according to a downlink reference signal (reference signal), and then feeds back The obtained CSI to a base station (eNodeB, eNB). And the base station determines the modulation and coding mode, the physical resource position and the transmission mode of the data sent to the UE according to the CSI fed back by the UE. In LTE systems, CSI includes three forms: a Channel Quality Indication (CQI), a Precoding Matrix Indication (PMI), and a Rank Indication (RI).
In the LTE system, there are two modes of periodic feedback and aperiodic feedback for CSI feedback of a downlink channel by a UE, which are respectively referred to as periodic CSI reporting (periodic CSI reporting) and aperiodic CSI reporting (aperiodic CSI reporting). The periodic CSI report means that the UE feeds back CSI periodically according to the configuration of the base station; the aperiodic CSI report refers to that the base station triggers the UE to feed back the CSI once through trigger signaling. For periodic CSI reporting, generally, if the UE does not send a Physical Uplink Shared Channel (PUSCH) on a subframe (subframe), CSI is transmitted on a Physical Uplink Control Channel (PUCCH); if the UE sends PUSCH, the CSI bearer is transmitted on the PUSCH. For aperiodic CSI reports, transmission is only on PUSCH.
In the LTE system, a base station schedules a certain UE to transmit a PUSCH through Uplink grant (UL grant) signaling. The uplink scheduling grant signaling may be transmitted to the scheduled UE by a PDCCH having Downlink Control Information (DCI) format 0(format 0). 1 bit in the DCI format 0 is used to trigger the UE to perform aperiodic CSI reporting, which is called channel quality indication request (CQI request). And if the CQI request is set to be 1, triggering the UE to feed back the aperiodic channel state information report. That is, if the UE detects a PDCCH with DCI format 0 format belonging thereto, the PUSCH is transmitted according to the UL grant contained therein. And if the UE detects that the 1-bit CQI request in the DCI format 0 is set to be '1', sending an aperiodic CSI report in the PUSCH scheduled by the DCI format 0.
An Advanced long term evolution (LTE-Advanced, LTE-a) system is a next generation evolution system of the LTE system, which employs a Carrier Aggregation (CA) technique to extend a transmission bandwidth to support a larger peak transmission rate. Fig. 1 is a schematic diagram of carrier aggregation of an LTE-a system according to the related art. As shown in fig. 1, each aggregated Carrier is referred to as a "Component Carrier" (CC), also called a Cell (Cell). The multiple component carriers may be located in the same frequency band (frequency band) or may be located in different frequency bands.
Cross-carrier scheduling (cross-carrier scheduling), i.e., transmitting scheduling information of other component carriers on one designated component carrier, is supported in the LTE-a system. For a Time Division Duplex (TDD) system, transmitting uplink and downlink scheduling information of other component carriers on a specified component carrier; for a Frequency Division Duplex (FDD) system, scheduling information of other downlink component carriers and uplink component carriers corresponding to the other downlink component carriers is sent on a specified downlink component carrier. The designated Component Carrier is referred to as a Component Carrier implementing cross-Carrier scheduling, also known as a physical downlink control channel Component Carrier (PDCCH Component Carrier, PDCCHCC).
The scheduling information is carried in a PDCCH having a specific downlink control information Format (DCI Format) and transmitted to the scheduled UE, and a Carrier Indicator Field (CIF) is introduced in the DCI Format to identify the scheduled component Carrier. Currently, the LTE-a system aggregates 5 component carriers at most, so the CIF is 3 bits. For a certain UE, whether to perform cross-carrier scheduling on the certain UE, on which component carrier to perform cross-carrier scheduling, and the component carriers that can be scheduled by the PDCCH CC performing cross-carrier scheduling are all configured by high-level signaling.
Regarding signaling values in CIF, two schemes are mainly proposed in the prior art, one is CIF value (CIF value), and the other is Component carrier index (CC index), or Cell index (Cell index). The signaling values in the CIF in both of these ways can be configured by higher layers.
The prior art proposes that, in an LTE-a system, when configured as cross-carrier scheduling, a base station transmits an aperiodic CSI report trigger command to a target UE using a PDCCH for scheduling a PUSCH. The PDCCH for scheduling the PUSCH has a specific downlink control information format, and includes DCI format 0 and PDCCH DCI format added in LTE-a for scheduling the PUSCH, such as DCI format 0', DCI format 4, and the like. And when the CQI request in the PDCCH is 1, triggering the UE to feed back the aperiodic CSI report. When cross-carrier scheduling is performed, the PDCCH includes CIF information. The base station indicates which or which group of component carriers to trigger aperiodic CSI report through CIF information carried by the PDCCH.
That is, in cross-carrier scheduling, if the CQI request is 0 in the PDCCH for scheduling the PUSCH, the CIF information is used to instruct the UE to schedule on which component carrier the PUSCH is to be transmitted; according to the prior art, when the CQI request is 1, CIF information is used to indicate an aperiodic CSI report that triggers the UE to feed back which one or which set of component carriers. The problems that arise from this are: when the CQI request is 1, the UE cannot know which component carrier the PDCCH schedules the UE to transmit PUSCH on.
To solve this problem, the prior art proposes: for a TDD system, the PDCCH is sent to the UE on which component carrier, and the UE is scheduled to send the PUSCH on which component carrier; for FDD systems, on which downlink Component Carrier (DL CC) the PDCCH is transmitted to the UE, the UE is scheduled to transmit the PUSCH on the Uplink Component Carrier (UL CC) corresponding to the downlink Component Carrier.
In an LTE-a FDD system, each downlink component carrier has an uplink component carrier corresponding to it. The correspondence between the uplink and downlink component carriers is preset, and is notified to the UE by the base station through a second type system information block (SIB-2, SystemInformationBlockType 2). Therefore, the corresponding relationship between the uplink and downlink component carriers in the LTE-a FDD system is also referred to as SIB-2 association or SIB-2 association (SIB-2 linking), and a pair of uplink and downlink component carriers are (corresponding to) a component carrier (SIB-2linked CC) associated with the SIB-2.
In FDD systems, the base station may configure (configure) or activate (activate) different numbers of uplink and downlink component carriers for the UE, as shown in fig. 2. The UE-specific Primary Component Carrier (PCC) includes a downlink PCC and an uplink PCC corresponding to the downlink PCC, which are also called Primary Cell (Pcell). The primary component carrier may be different for different UEs. In addition, in addition to a pair of primary Component carriers, the base station may configure or activate one or more downlink slave Component carriers (Secondary Component carriers) and one or more uplink slave Component carriers, also referred to as slave cells (scells), for the UE.
As shown in fig. 2, the base station may configure or activate a downlink component carrier (e.g., downlink slave component carrier #2) for a certain UE (e.g., UE0), but not configure the uplink component carrier (e.g., uplink slave component carrier #2) corresponding to SIB-2 of the DL CC (e.g., downlink slave component carrier #2) for the UE. When cross-carrier scheduling is performed, if such a downlink component carrier is configured as a PDCCH CC of the UE, in this way, when a CQI request in the PDCCH transmitted on the downlink component carrier is 1, CIF information is only used to indicate which one or which group of component carriers to trigger an aperiodic CSI report, and on which uplink component carrier the PUSCH scheduled by the PDCCH is transmitted, at this time, the UE still cannot know.
In addition, a Sounding Reference Signal (SRS) is an uplink Signal used between the terminal device and the base station to measure the uplink channel CSI. In the LTE system, the UE transmits the SRS on the last data symbol of a transmission subframe (subframe) in a timing manner according to parameters such as a bandwidth, a frequency domain position, a sequence cyclic shift, a period, and a subframe offset indicated by the eNB. And the eNB judges the CSI of the UE uplink according to the received SRS, and performs operations such as frequency domain selection scheduling, closed-loop power control and the like according to the obtained CSI.
In the LTE-a system, in order to improve utilization of SRS resources and improve flexibility of resource scheduling, in addition to reserving an SRS (called periodic sounding reference signal) originally transmitted periodically in LTE, a PDCCH may be used to trigger a UE to transmit an SRS aperiodically (called aperiodic sounding reference signal). In this way, under cross-carrier scheduling, the base station cannot instruct the UE on which component carrier to transmit the triggered aperiodic SRS, and likewise, the UE cannot know on which component carrier to transmit the triggered aperiodic SRS.
Disclosure of Invention
The main object of the present invention is to provide a PDCCH transmitting method and a base station for cross-carrier scheduling, so as to solve at least one of the problems that, in the LTE-a system, when a CQI request in a PDCCH including a CIF for scheduling a PUSCH is 1, and the CIF is used to instruct a UE to feed back an aperiodic CSI report of a specified component carrier, the PDCCH cannot instruct on which component carrier a scheduled PUSCH is transmitted, and when the PDCCH including the CIF triggers an aperiodic SRS, the PDCCH cannot instruct on which component carrier the triggered aperiodic SRS is transmitted.
According to an aspect of the present invention, there is provided a PDCCH transmitting method for cross-carrier scheduling, including: in an FDD system, a base station configures a downlink component carrier configured to UE as a component carrier for implementing cross-carrier scheduling of the UE, wherein 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 an aperiodic CSI report, the UE is instructed to send a PUSCH scheduled by the PDCCH to the base station on the uplink component carrier; or, the base station sends the PDCCH to the UE on the downlink ccs, and when the PDCCH triggers the aperiodic SRS, the base station instructs the UE to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink ccs.
According to another aspect of the present invention, there is provided a PDCCH transmitting method for cross-carrier scheduling, including: the base station configures the component carrier configured to the UE as a component carrier for implementing cross-carrier scheduling of the UE; the base station sends a PDCCH to the UE on the component carrier, and when the PDCCH triggers an aperiodic CSI report, the UE is instructed to send a PUSCH scheduled by the PDCCH to the base station on the component carrier which can be scheduled by the PDCCH; or, the base station sends the PDCCH to the UE on the component carrier, and when the PDCCH triggers the aperiodic SRS, the base station instructs the UE to send the aperiodic SRS triggered by the PDCCH to the base station on the component carrier that can be scheduled by the PDCCH.
According to still another aspect of the present invention, there is provided a PDCCH transmitting method for cross-carrier scheduling, including: the base station sends a PDCCH to the UE, wherein the PDCCH carries a CIF, and when the PDCCH triggers the aperiodic SRS, the CIF is used for indicating the UE to send the aperiodic SRS triggered by the PDCCH to a component carrier used by the base station.
According to still another aspect of the present invention, there is provided a base station for cross-carrier scheduling, including: a configuration module, configured to configure a downlink component carrier configured to the UE as a cross-carrier scheduling component carrier of the UE when a system in which the base station is located is an FDD system, where an uplink component carrier corresponding to the downlink component carrier is configured to the UE; a sending module, configured to send the PDCCH to the UE on the downlink component carrier, and instruct the UE to send the PUSCH scheduled by the PDCCH to the base station on the uplink component carrier when the PDCCH triggers an aperiodic CSI report, or instruct the UE to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier when the PDCCH triggers an aperiodic SRS.
By the invention, in an LTE-A FDD system, a base station only configures the downlink component carrier in a certain pair of uplink and downlink component carriers 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 an aperiodic CSI report, the UE is indicated to send the PUSCH scheduled by the PDCCH on an uplink component carrier corresponding to the downlink component carrier; when a PDCCH is transmitted on the downlink component carrier, and the PDCCH triggers the UE to transmit an aperiodic SRS, instructing the UE 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 that, for both PUSCH and aperiodic SRS, the PDCCH can indicate the UE to transmit on the uplink component carrier that transmitted the downlink component carrier, since the uplink component carrier is necessarily configured to the UE, the problem of the LTE-a system can be solved, when the CQI request is 1 in a PDCCH for scheduling PUSCH including a CIF for instructing a UE to feed back an aperiodic CSI report of a designated component carrier, the PDCCH cannot indicate the problem on which component carrier its scheduled PUSCH is transmitted and when the PDCCH containing the CIF triggers an aperiodic SRS, the PDCCH cannot indicate one of the problems on which component carrier its triggered aperiodic SRS is transmitted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. 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 diagram of carrier aggregation of one UE of an LTE-a FDD system according to the related art;
fig. 3 is a flowchart of a physical downlink control channel PDCCH transmitting method for cross-carrier scheduling according to an embodiment of the present invention;
fig. 4 is a flowchart of a physical downlink control channel PDCCH transmitting method for cross-carrier scheduling according to another embodiment of the present invention;
fig. 5 is a flowchart of a physical downlink control channel PDCCH transmitting method for cross-carrier scheduling according to yet another embodiment of the present invention;
fig. 6 is a schematic diagram of a base station for cross-carrier scheduling according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application 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 in 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 include the following implementation methods.
Method 1
Fig. 3 is a flowchart of a PDCCH transmitting method 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 downlink component carrier configured to a certain UE as a component carrier (i.e. FDCCH CC) implementing cross-carrier scheduling of the UE, where an uplink component carrier corresponding to the downlink component carrier (specifically, an uplink component carrier corresponding to (or associated with) SIB-2 of the downlink component carrier) is configured to 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 SIB-2 is not configured to the UE, the downlink component carrier cannot be configured as the PDCCH CC of the UE, that is, the PDCCH transmitted by the base station to the UE on the downlink component carrier cannot cross-carrier schedule the UE to receive the PDSCH on other downlink component carriers or transmit the PUSCH on other uplink component carriers, or the base station does not transmit 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 SIB-2 of the certain downlink component carrier must be configured for the UE.
Step S304, the base station sends a PDCCH to the UE on the downlink cc, and the PDCCH triggers the UE to feed back an aperiodic CSI report, and then instructs the UE to send a PUSCH scheduled by the PDCCH to the base station on the uplink cc (it is obvious that the PDCCH is used to schedule a PUSCH and the PDCCH carries a carrier indication field CIF, and the CIF is used to instruct the UE to feed back an aperiodic CSI report of the cc indicated by the CIF);
or, in step S304, the base station sends a PDCCH to the UE on the downlink component carrier, and the PDCCH triggers the UE to send an aperiodic SRS, and then instructs the UE to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier (at this time, it is obvious that the PDCCH carries a carrier indication field CIF, where if the PDCCH is used to schedule a PUSCH, the CIF is used to instruct the UE to send the PUSCH on which uplink component carrier, and if the PDCCH is used to schedule a PDSCH, the CIF is used to instruct the UE to receive the PDSCH on which downlink component carrier).
In this embodiment, in an LTE-a FDD system, a base station only configures a downlink component carrier in a certain pair of uplink and downlink component carriers that have been configured for a certain UE as a PDCCH CC of the UE. When the PDCCH is sent on the downlink component carrier and the PDCCH triggers the UE to feed back an aperiodic CSI report, the UE is indicated to send the PUSCH scheduled by the PDCCH on an uplink component carrier corresponding to the downlink component carrier; when a PDCCH is transmitted on the downlink component carrier, and the PDCCH triggers the UE to transmit an aperiodic SRS, instructing the UE 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 that, for both PUSCH and aperiodic SRS, the PDCCH can indicate the UE to transmit on the uplink component carrier that transmitted the downlink component carrier, since the uplink component carrier is necessarily configured to the UE, the problem of the LTE-a system can be solved, when the CQI request is 1 in a PDCCH for scheduling PUSCH including a CIF for instructing a UE to feed back an aperiodic CSI report of a designated component carrier, the PDCCH cannot indicate the problem on which component carrier its scheduled PUSCH is transmitted and when the PDCCH containing the CIF triggers an aperiodic SRS, the PDCCH cannot indicate one of the problems on which component carrier its triggered aperiodic SRS is transmitted.
(1) For PUSCH:
in the LTE-a FDD system, when a CQI request in a PDCCH for scheduling a PUSCH including a CIF is 1 (indicating that the PDCCH triggers an aperiodic CSI report), the PUSCH scheduled by the PDCCH is transmitted on an uplink component carrier corresponding to a downlink component carrier on which the PDCCH is transmitted. Wherein, the uplink component carrier corresponding to the downlink component carrier is the uplink component carrier associated with the downlink component carrier SIB-2.
In the LTE-a TDD system, when a CQI request of a PDCCH for scheduling a PUSCH including a CIF is 1, the PUSCH scheduled by the PDCCH is transmitted on a component carrier on which the PDCCH is transmitted. Wherein the PDCCH containing CIF for scheduling PUSCH is transmitted on a component carrier PDCCHCC implementing cross-carrier scheduling for the UE scheduled by the PDCCH.
(2) For aperiodic SRS:
in an LTE-a FDD system, when a PDCCH including a CIF triggers an aperiodic SRS, the aperiodic SRS triggered by the PDCCH is transmitted on an uplink component carrier corresponding to a downlink component carrier that transmits the PDCCH. Wherein, the uplink component carrier corresponding to the downlink component carrier is the uplink component carrier associated with the downlink component carrier SIB-2.
That is, in the LTE-a FDD system, when a PDCCH including a CIF for scheduling a PDSCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate a downlink component carrier where the PDSCH scheduled by the PDCCH is located. And the aperiodic SRS triggered by the PDCCH is transmitted on an uplink component carrier corresponding to a downlink component carrier for transmitting the PDCCH.
In the LTE-a TDD system, when a PDCCH including a CIF triggers an aperiodic SRS, the aperiodic SRS triggered by the PDCCH is transmitted on a component carrier on which the PDCCH is transmitted. Preferably, the PDCCH triggering the aperiodic SRS is used for scheduling PDSCH.
That is, in the LTE-a TDD system, when a PDCCH for scheduling a PDSCH including a CIF triggers an aperiodic SRS, the CIF included in the PDCCH indicates a component carrier in which the PDSCH scheduled by the PDCCH is located. And the aperiodic SRS triggered by the PDCCH is transmitted on the component carrier on which the PDCCH is transmitted.
Example one
In the LTE-a FDD system, a base station configures 1 pair of primary component carriers DL CC0 and UL CC0 for a certain UE, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 (uplink secondary component carriers UL CC2 and UL CC3 associated with SIB-2 are not configured for the UE).
Under cross-carrier scheduling, only DL CC0 or DL CC1 can be configured as PDCCHCC of the UE, and DL CC2 or DL CC3 cannot be configured as PDCCH CC of the UE.
For this UE, DL CC0 is configured as a PDCCH CC, and the PDCCH transmitted on DL CC0 can schedule DL CC0 and UL CC0, DL CC1 and UL CC1, and DL CC2 and DL CC 3.
When the UE detects a PDCCH for scheduling a PUSCH belonging to the UE on DL CC0, and the CQI request is 1, the CIF included in the PDCCH is used to indicate that the UE feeds back an aperiodic CSI report of a specified component carrier. And the PDCCH schedules the UE to transmit PUSCH on UL CC 0.
For this UE, DL CC0 is configured as a PDCCH CC, and the PDCCH transmitted on DL CC0 can schedule DL CC0 and UL CC0, DL CC1 and UL CC1, and DL CC2 and DL CC 3.
When the UE detects a PDCCH for scheduling a PDSCH on the DL CC0, and the PDCCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier of the PDSCH scheduled by the PDCCH. And the PDCCH triggers the UE to send an aperiodic SRS on the UL CC 0.
Fig. 4 is a flowchart of a physical downlink control channel PDCCH transmitting method for cross-carrier scheduling according to another embodiment of the present invention, which includes the following steps:
step S402, a base station configures a certain component carrier configured to a certain UE as a component carrier for implementing cross-carrier scheduling of the UE;
step S404, the base station sends the PDCCH to the UE on the cc, and when the PDCCH triggers the UE to feed back the aperiodic CSI report, the base station instructs the UE to send the PUSCH scheduled by the PDCCH on a cc that can be scheduled by the PDCCH, or when the PDCCH triggers the UE to send the aperiodic SRS, instructs the UE to send the aperiodic SRS triggered by the PDCCH on a cc that can be scheduled by the PDCCH to the base station.
Obviously, in the FDD system, a certain cc in step S402 should be a downlink cc, and a cc that can be scheduled by the PDCCH in step S404 should be an uplink cc configured for the UE.
In this embodiment, since the PDCCH sent to the UE instructs the UE to send the PUSCH scheduled by the PDCCH or the aperiodic SRS triggered by the PDCCH to the base station on one component carrier that can be scheduled by the PDCCH, the UE can correctly send the PUSCH or the aperiodic SRS using one component carrier that can be scheduled by the received PDCCH both in an FDD system and in a TDD system, and thus one of the two problems in the prior art can be solved well.
The embodiment shown in fig. 4 may include the following methods two to four.
Method two (not distinguishing TDD/FDD system)
(1) For PUSCH:
in the LTE-a system, when one component carrier is configured as PDCCHCC of a certain UE, and if CQIrequest in a PDCCH for scheduling a PUSCH transmitted on the component carrier is 1, 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 sent on the PDCCH CC of the UE.
Preferably, the component carrier for transmitting PUSCH is one component carrier with a largest or smallest CIF value (CIF value) among component carriers that can be scheduled by the PDCCH CC; or, the component carrier transmitting the PUSCH is one component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) among component carriers that can be scheduled by the PDCCH CC. In this way, the UE can transmit PUSCH on the component carrier.
That is, in the LTE-a system, if the CQI request in the PDCCH for scheduling the PUSCH including the CIF is 1, the PUSCH scheduled by the PDCCH is transmitted on one component carrier that can be scheduled by the component carrier transmitting the PDCCH. The component carrier for sending the PUSCH is one component carrier with the largest or smallest CIF value (CIF value) in the component carriers which can be scheduled by the component carrier for sending the PDCCH; or, the component carrier for transmitting the PUSCH is one component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) among component carriers that can be scheduled by the component carrier for transmitting the PDCCH.
(2) Aperiodic SRS:
in an LTE-a system, when a downlink component carrier is configured as a PDCCH CC of a certain UE, if a PDCCH transmitted on the component carrier triggers an aperiodic SRS, the aperiodic SRS triggered by the PDCCH is transmitted on a component carrier that can be scheduled by the PDCCH CC.
Preferably, the component carrier for transmitting the aperiodic SRS is one of component carriers with a largest or smallest CIF value (CIF value) among component carriers that can be scheduled by the PDCCH CC; or, the component carrier transmitting the aperiodic SRS is a component carrier with a largest or smallest component carrier index (CC index) or cell index (Cellindex) among component carriers that can be scheduled by the PDCCH CC. In this way, the UE may transmit the aperiodic SRS on the component carrier.
Preferably, the PDCCH triggering the aperiodic SRS is used for scheduling PDSCH.
That is, in the LTE-a system, when a PDCCH for scheduling a PDSCH including a CIF triggers an aperiodic SRS, the CIF included in the PDCCH indicates a component carrier in which the PDSCH scheduled by the PDCCH is located. And the aperiodic SRS triggered by the PDCCH is transmitted on one component carrier that can be scheduled by the component carrier transmitting the PDCCH. The component carrier for transmitting the aperiodic SRS is a component carrier with the largest or smallest CIF value (CIF value) in the component carriers which can be scheduled by the component carrier for transmitting the PDCCH; or, the component carrier transmitting the aperiodic SRS is one of component carriers with a largest or smallest component carrier index (CCindex) or Cell index (Cell index) among component carriers that can be scheduled to transmit the PDCCH.
Example two
In the LTE-a FDD system, a base station configures 1 pair of primary component carriers DL CC0 and UL CC0 for a certain UE, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 (uplink secondary component carriers UL CC2 and UL CC3 associated with SIB-2 are not configured for the UE).
If the UE is configured with DL CC0 as PDCCH CC, the PDCCH transmitted on DL CC0 can schedule DL CC0 and UL CC0, DL CC1 and UL CC1, and DL CC2 and DL CC 3.
When the UE detects a PDCCH for scheduling a PUSCH belonging to the UE on DL CC0, and the CQI request is 1, the CIF included in the PDCCH is used to indicate that the UE feeds back an aperiodic CSI report of a specified component carrier. And the PDCCH schedules the UE to transmit PUSCH on UL CC0 with the smallest component carrier index among the uplink component carriers that DL CC0 can schedule.
When the UE detects a PDCCH for scheduling a PDSCH on the DL CC0, and the PDCCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier of the PDSCH scheduled by the PDCCH. And the PDCCH triggers the UE to transmit an aperiodic SRS on the UL CC0 with the smallest component carrier index among the uplink component carriers that can be scheduled by the DL CC 0.
(II) if the UE is configured with DL CC1 as PDCCH CC, and the PDCCH transmitted on DL CC1 can schedule DL CC0 and UL CC0, DL CC1 and UL CC1, and DL CC2 and DLCC 3.
When the UE detects a PDCCH for scheduling a PUSCH belonging to the UE on DL CC1, and the CQI request is 1, the CIF included in the PDCCH is used to indicate that the UE feeds back an aperiodic CSI report of a specified component carrier. And the PDCCH schedules the UE to transmit PUSCH on UL CC0 with the smallest component carrier index among the uplink component carriers that DL CC1 can schedule.
When the UE detects a PDCCH for scheduling a PDSCH on the DL CC1, and the PDCCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier of the PDSCH scheduled by the PDCCH. And the PDCCH triggers the UE to transmit an aperiodic SRS on the UL CC0 with the smallest component carrier index among the uplink component carriers that can be scheduled by the DL CC 1.
(iii) if DL CC1 is configured as a PDCCH CC for the UE, and the PDCCH transmitted on DL CC1 can schedule only DL CC1 and UL CC1, DL CC2 and DL CC 3.
When the UE detects a PDCCH for scheduling PUSCH belonging to the UE on DL CC1, and where CQI request is 1, the CIF is used to instruct the UE to feed back an aperiodic CSI report of a specified component carrier. And the PDCCH schedules the UE to transmit PUSCH on UL CC1 with the smallest component carrier index among the uplink component carriers that DL CC1 can schedule.
When the UE detects a PDCCH for scheduling a PDSCH on the DL CC1, and the PDCCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier of the PDSCH scheduled by the PDCCH. And the PDCCH schedules the UE to transmit an aperiodic SRS on a UL CC1 with the smallest component carrier index among uplink component carriers that can be scheduled by the DL CC 1.
EXAMPLE III
In the LTE-a TDD system, a base station configures 1 primary component carrier CC0, 3 secondary component carriers CC1, CC2, and CC3 for a UE.
If the UE is configured with CC2 as PDCCH CC, and the PDCCH transmitted on CC2 can schedule CC0 (with CIF value of 2), CC1 (with CIF value of 3), CC2 (with CIF value of 0), and CC3 (with CIF value of 1).
When the UE detects a PDCCH belonging to it for scheduling PUSCH on CC2, and where CQI request is 1, CIF is used to instruct the UE to feed back aperiodic CSI report of the specified component carrier. And the PDCCH schedules the UE to transmit PUSCH on CC1 with the largest CIF value among component carriers that CC2 can schedule.
When the UE detects a PDCCH for scheduling a PDSCH on the CC2, and the PDCCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate the component carrier of the PDSCH scheduled by the PDCCH. And the PDCCH schedules the UE to transmit an aperiodic SRS on CC1 with the largest CIF value among component carriers that CC2 can schedule.
Second, if the UE is configured with CC2 as PDCCH CC, and the PDCCH transmitted on CC2 can schedule CC1 (with CIF value of 1), CC2 (with CIF value of 0), and CC3 (with CIF value of 2).
When the UE detects a PDCCH belonging to it for scheduling PUSCH on CC2, and where CQI request is 1, CIF is used to instruct the UE to feed back aperiodic CSI report of the specified component carrier. And the PDCCH schedules the UE to transmit PUSCH on CC3 with the largest CIF value among component carriers that CC2 can schedule.
When the UE detects a PDCCH for scheduling a PUSCH on CC2, and the PDCCH triggers an aperiodic SRS, a CIF included in the PDCCH is used to indicate a component carrier where a PDSCH scheduled by the PDCCH is located. And the PDCCH schedules the UE to transmit an aperiodic SRS on CC3 with the largest CIF value among component carriers that CC2 can schedule.
Method three (distinguishing TDD/FDD system)
(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 for a certain UE, and if a CQI request in a PDCCH for scheduling a PUSCH transmitted on the downlink component carrier is 1, the PUSCH scheduled by the PDCCH is transmitted on one uplink component carrier that can be scheduled by the PDCCH CC.
Preferably, the uplink component carrier is an uplink component carrier with a maximum or minimum CIF value (CIF value) among uplink component carriers that can be scheduled by the PDCCH CC; or, the uplink component carrier is an uplink component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) in the uplink component carrier that can be scheduled by the PDCCH CC. In this way, the UE can transmit 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 for a certain UE, and when a CQI request of a PDCCH for scheduling a PUSCH transmitted on the component carrier is 1, the PUSCH scheduled by the PDCCH is transmitted on the component carrier on which the PDCCH is transmitted.
That is, in the LTE-a FDD system, if the CQI request in the PDCCH for scheduling the PUSCH including the CIF is 1, the PUSCH scheduled by the PDCCH is transmitted on one uplink component carrier which can be scheduled by the downlink component carrier transmitting the PDCCH. The uplink component carrier for sending the PUSCH is an uplink component carrier with a maximum or minimum CIF value (CIF value) in uplink component carriers that can be scheduled by a downlink component carrier for sending the PDCCH; or, the uplink component carrier for transmitting the PUSCH is one uplink component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) among uplink component carriers that can be scheduled by the downlink component carrier for transmitting the PDCCH.
In the LTE-a TDD system, when a CQI request of a PDCCH for scheduling a PUSCH including a CIF is 1, the PUSCH scheduled by the PDCCH is transmitted on a component carrier on which the PDCCH is transmitted.
(2) Aperiodic SRS:
in an LTE-a FDD system, when a downlink component carrier is configured as a component carrier PDCCH CC of a certain UE, which implements cross-carrier scheduling, if a PDCCH sent on the downlink component carrier triggers an aperiodic SRS, the aperiodic SRS triggered by the PDCCH is sent on an uplink component carrier that can be scheduled by the PDCCH CC.
Preferably, the uplink component carrier is an uplink component carrier with a maximum or minimum CIF value (CIF value) among uplink component carriers that can be scheduled by the PDCCH CC; or, the uplink component carrier is an uplink component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) in the uplink component carrier that can be scheduled by the PDCCH CC.
In the LTE-a TDD system, when a component carrier is configured as a component carrier PDCCH CC for implementing cross-carrier scheduling of a certain UE, if an aperiodic SRS is triggered by the PDCCH transmitted on the component carrier, the aperiodic SRS triggered by the PDCCH is transmitted on the PDCCH CC.
Preferably, the PDCCH triggering the aperiodic SRS is used for scheduling PDSCH.
That is, in the LTE-a FDD system, when a PDCCH including a CIF for scheduling a PDSCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate a downlink component carrier where the PDSCH scheduled by the PDCCH is located. And the aperiodic SRS triggered by the PDCCH is transmitted on an uplink component carrier corresponding to a downlink component carrier for transmitting the PDCCH.
In the LTE-a TDD system, when a PDCCH including a CIF for scheduling a PDSCH triggers an aperiodic SRS, the CIF included in the PDCCH is used to indicate a component carrier on which the PDSCH scheduled by the PDCCH is located. And the aperiodic SRS triggered by the PDCCH is transmitted on the component carrier on which the PDCCH is transmitted.
Method IV
(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 for a certain UE, and if a CQI request in a PDCCH for scheduling a PUSCH transmitted on the downlink component carrier is 1, the following two cases are performed:
case 1: if an uplink component carrier (specifically, an uplink component carrier associated with (or corresponding to) the downlink component carrier SIB-2) corresponding to the PDCCH CC is configured to the UE, sending a PUSCH scheduled by the PDCCH on the uplink component carrier;
case 2: and if the uplink component carrier corresponding to the PDCCH CC is not configured to the UE, sending the PUSCH scheduled by the PDCCH on one uplink component carrier which can be scheduled by the PDCCH CC.
Preferably, the uplink component carrier is an uplink component carrier with a maximum or minimum CIF value (CIF value) among uplink component carriers that can be scheduled by the PDCCH CC; or, the uplink component carrier is an uplink component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) in the uplink component carrier that can be scheduled by the PDCCH CC.
In the LTE-a TDD system, when one component carrier is configured as a component carrier PDCCH CC for performing cross-carrier scheduling for a certain UE, and when a CQI request of a PDCCH for scheduling a PUSCH transmitted on the component carrier is 1, the PUSCH scheduled by the PDCCH is transmitted on the component carrier on which the PDCCH is transmitted.
(2) Aperiodic SRS:
in an LTE-a FDD system, under cross-carrier scheduling, when a downlink component carrier is configured as a component carrier PDCCH CC of a certain UE, which implements cross-carrier scheduling, if a PDCCH sent on the downlink component carrier triggers an aperiodic SRS, the scheduling is performed according to the following two conditions:
case 1: if an uplink component carrier (specifically, an uplink component carrier associated with the downlink component carrier SIB-2) corresponding to the PDCCH CC is configured to the UE, sending an aperiodic SRS triggered by the PDCCH on the uplink component carrier;
case 2: if the uplink component carrier corresponding to the PDCCH CC is not configured to the UE, sending the aperiodic SRS triggered by the PDCCH on one uplink component carrier which can be scheduled by the PDCCH CC;
preferably, the uplink component carrier is an uplink component carrier with a maximum or minimum CIF value (CIF value) among uplink component carriers that can be scheduled by the PDCCH CC; or, the uplink component carrier is an uplink component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) in the uplink component carrier that can be scheduled by the PDCCH CC.
In the LTE-a TDD system, when a component carrier is configured as a component carrier PDCCH CC for implementing cross-carrier scheduling of a certain UE, if an aperiodic SRS is triggered by the PDCCH transmitted on the component carrier, the aperiodic SRS triggered by the PDCCH is transmitted on the PDCCH CC.
In summary, in the fourth method, before the E transmits the PUSCH scheduled by the PDCCH or the aperiodic SRS triggered by the PDCCH on the component carrier that can be scheduled by the PDCCH to the base station in step S404 shown in fig. 4, the UE needs to first determine whether the uplink component carrier corresponding to the downlink component carrier is already configured to itself, and if it is determined that the uplink component carrier corresponding to the downlink component carrier is already configured to itself, the UE transmits the PUSCH or the aperiodic SRS on the uplink component carrier corresponding to the downlink component carrier to the base station; and if the component carrier is determined not to be configured to the base station, sending PUSCH or aperiodic SRS to the base station on the component carrier which can be scheduled by the PDCCH.
Method five
Fig. 5 is a flowchart of a physical downlink control channel PDCCH transmitting method 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, wherein the PDCCH carries a CIF, and when the PDCCH triggers the UE to send an aperiodic SRS, the CIF is used for indicating the UE to send the aperiodic SRS triggered by the PDCCH to a component carrier used by the base station. That is, the UE transmits the aperiodic SRS on the component carrier indicated by the CIF.
Obviously, in the FDD system, in step S502, the base station sends the PDCCH to the UE using a downlink component carrier configured to the UE, and the UE sends the aperiodic SRS triggered by the PDCCH to the base station using an uplink component carrier configured to the UE.
Specifically, when a PDCCH including a CIF triggers a UE to transmit an aperiodic SRS, the CIF instructs the UE to transmit the aperiodic SRS on a designated component carrier.
Preferably, the CIF indicates a CIF value or a component carrier index of a component carrier transmitting the aperiodic SRS.
Preferably, when the PDCCH triggers the UE to transmit an aperiodic SRS on a set of component carriers, the CIF indicates a CIF value or a component carrier index of one component carrier in the set of component carriers.
Preferably, the CIF indicates a group index number corresponding to a group of triggered component carriers for transmitting an aperiodic SRS.
Preferably, the set of component carriers refers to all configured (configured) or activated (activated) component carriers of the UE (for a TDD system), or all configured or activated uplink component carriers of the UE (for an FDD system).
Preferably, the group of component carriers refers to a part of component carriers configured or activated by the UE (for a TDD system) or a part of uplink component carriers configured or activated by the UE (for an FDD system).
Preferably, the set of component carriers is predetermined or configured by a higher layer.
Preferably, the group of component carriers refers to component carriers that satisfy a certain preset relationship among the component carriers configured or activated by the UE.
For example, a group of component carriers are component carriers whose index numbers modulo 2 are congruence (i.e., the remainders after modulo 2 are the same) among the component carriers configured or activated by the UE.
For another example, a group of component carriers are component carriers that can be scheduled by the same component carrier among uplink component carriers configured or activated by the UE.
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 configures or activates only one component carrier on a certain frequency band, the group of component carriers only includes the one component carrier.
For another example, the group of component carriers refers to component carriers that share a same Radio Frequency link (RF Chain) among the component carriers 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 only includes the one component carrier.
In the LTE-a system, when a component carrier is configured as PDCCHCC of a certain UE, if a PDCCH for scheduling a PDSCH transmitted on the component carrier triggers an aperiodic SRS, the component carrier scheduled by the PDCCH is a component carrier that can be scheduled by the PDCCH CC, that is, the PDSCH scheduled by the PDCCH is transmitted on a component carrier that can be scheduled by the PDCCH CC.
Obviously, in an FDD system, a component carrier configured to implement cross-carrier scheduling of component carriers is a downlink component carrier configured to the UE, and a component carrier that can be scheduled by the PDCCH is a downlink component carrier configured to the UE.
Preferably, the component carrier transmitting the PDSCH is the PDCCH CC; or, the component carrier transmitting the PDSCH is one of the component carriers with the largest or smallest CIF value (CIF value) among the component carriers that can be scheduled by the PDCCH CC; or, the component carrier transmitting the PDSCH is a component carrier with a maximum or minimum component carrier index (CC index) or Cell index (Cell index) among component carriers that can be scheduled by the PDCCH CC.
Here, it is worth noting that: in the embodiments (including the methods one to five) shown in fig. 3 to 5, when the transmitted PDCCH including the CIF is used to schedule the PUSCH and trigger the aperiodic CSI report and the aperiodic SRS of a certain UE at the same time, the CIF in the PDCCH is used to instruct the UE to feed back the aperiodic CSI report of the specified component carrier or to instruct the UE to transmit the aperiodic SRS on the specified component carrier.
And when the PDCCH including the CIF and used for scheduling the PUSCH triggers the aperiodic CSI report and the aperiodic SRS at the same time, the PUSCH scheduled by the PDCCH and the triggered aperiodic SRS are transmitted on the same component carrier.
And triggering the aperiodic SRS by the PDCCH for scheduling the PUSCH, wherein 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 modules:
a configuration module 10, configured to configure a downlink component carrier configured to a UE as a component carrier implementing cross-carrier scheduling for the UE when a system where a base station is located is an FDD system, where an uplink component carrier corresponding to the downlink component carrier is configured to the UE;
a sending module 20, configured to send the PDCCH on the downlink component carrier to the UE, and instruct the UE to send the PUSCH scheduled by the PDCCH on the uplink component carrier to the base station when the PDCCH triggers an aperiodic CSI report, or instruct the UE to send the aperiodic SRS triggered by the PDCCH on the uplink component carrier to the base station when the PDCCH triggers an aperiodic SRS.
From the above description, it can be seen that the present invention achieves the following technical effects: in both FDD system or TDD system and PUSCH or aperiodic SRS, the PDCCH transmitted by the base station can instruct the UE to transmit PUSCH scheduled by the PDCCH or aperiodic SRS triggered by the PDCCH on which component carrier, so that in the above LTE-a system, when the PDCCH including CIF for scheduling PUSCH has CQI request of 1 and the CIF is used to instruct the UE to feed back an aperiodic CSI report of a specified component carrier, the PDCCH cannot instruct the PUSCH scheduled by the UE to be transmitted on which component carrier, and when the PDCCH including CIF triggers aperiodic SRS, the PDCCH cannot instruct the aperiodic SRS triggered by the PDCCH to be transmitted on which component carrier.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present 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 may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (18)

1. A method for sending a Physical Downlink Control Channel (PDCCH) for cross-carrier scheduling is characterized by comprising the following steps:
in a Frequency Division Duplex (FDD) system, a base station configures a downlink component carrier configured to User Equipment (UE) as a component carrier for implementing cross-carrier scheduling of the UE, wherein 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 an aperiodic Channel State Information (CSI) report, the base station instructs the UE to send a Physical Uplink Shared Channel (PUSCH) scheduled by the PDCCH to the base station on the uplink component carrier; or, the base station sends the PDCCH to the UE on the downlink component carrier, and when the PDCCH triggers an aperiodic sounding reference signal SRS, the base station instructs the UE to send the aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier.
2. The method of claim 1, wherein the uplink component carrier is an uplink component carrier corresponding to a second type system information block (SIB-2) of the downlink component carrier.
3. The method of 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 aperiodic SRS triggered by the PDCCH to the base station on a component carrier used for sending the PDCCH.
4. The method according to claim 1 or 3, wherein the PDCCH triggering the aperiodic SRS is further used for scheduling a Physical Downlink Shared Channel (PDSCH).
5. The method of claim 1, wherein the PDCCH carries a carrier indicator field, CIF; in case the PDCCH is used to schedule the PUSCH and an aperiodic CSI report and an aperiodic SRS are triggered simultaneously,
the CIF is used for indicating the UE to feed back an aperiodic CSI report of the component carrier indicated by the CIF to the base station; or the CIF is configured to instruct the UE to transmit the aperiodic SRS to the base station on the component carrier indicated by the CIF.
6. A method for sending a Physical Downlink Control Channel (PDCCH) for cross-carrier scheduling is characterized by comprising the following steps:
a base station configures a component carrier configured to User Equipment (UE) as a component carrier for implementing cross-carrier scheduling of the UE;
the base station sends a PDCCH to the UE on the component carrier, and when the PDCCH triggers an aperiodic Channel State Information (CSI) report, the base station instructs the UE to send a Physical Uplink Shared Channel (PUSCH) scheduled by the PDCCH to the base station on the component carrier which can be scheduled by the PDCCH; or, the base station sends the PDCCH to the UE on the component carrier, and when the PDCCH triggers an aperiodic sounding reference signal SRS, the base station instructs the UE to send the aperiodic SRS triggered by the PDCCH to the base station on the component carrier that can be scheduled by the PDCCH.
7. The method of claim 6, wherein the component carrier configured by the base station to implement cross-carrier scheduling is a downlink component carrier configured for the UE, and the component carrier that can be scheduled by the PDCCH is an uplink component carrier configured for the UE in a Frequency Division Duplex (FDD) system.
8. The method of claim 7, wherein before the UE transmits the PDCCH-scheduled PUSCH or the PDCCH-triggered aperiodic Sounding Reference Signal (SRS) to the base station on a component carrier that can be scheduled by the PDCCH, the method further comprises:
and the UE determines that the uplink component carrier corresponding to the downlink component carrier is not configured to the UE.
9. The method of claim 8, further comprising:
and if the UE determines that the uplink component carrier corresponding to the downlink component carrier is configured to the UE, the UE sends the PUSCH or the aperiodic SRS to the base station on the uplink component carrier corresponding to the downlink component carrier.
10. The method of claim 8, wherein the uplink component carrier corresponding to the downlink component carrier is an uplink component carrier corresponding to a second type system information block (SIB-2) of the downlink component carrier.
11. The method of claim 6, wherein the PDCCH is used for scheduling a Physical Downlink Shared Channel (PDSCH) in case that the PDCCH triggers the aperiodic SRS.
12. The method according to any one of claims 6 to 11,
the component carrier used by the UE for sending the PUSCH or the aperiodic SRS is the component carrier with the maximum or minimum CIF value in the component carriers which can be scheduled by the PDCCH; or,
and the component carrier used by the UE for sending the PUSCH or the aperiodic SRS is the component carrier with the maximum or minimum component carrier index or cell index in the component carrier which can be scheduled by the PDCCH.
13. The method of claim 6, wherein the PDCCH carries a Carrier Indicator Field (CIF); in case the PDCCH is used to schedule the PUSCH and an aperiodic channel state information, CSI, report and an aperiodic SRS are triggered simultaneously,
the CIF is used for indicating the UE to feed back an aperiodic CSI report of the component carrier indicated by the CIF to the base station; or the CIF is configured to instruct the UE to transmit the aperiodic SRS to the base station on the component carrier indicated by the CIF.
14. A method for sending a Physical Downlink Control Channel (PDCCH) for cross-carrier scheduling is characterized by comprising the following steps:
the method comprises the steps that a base station sends a PDCCH to User Equipment (UE), wherein the PDCCH carries a Carrier Indication Field (CIF), and when the PDCCH triggers an aperiodic Sounding Reference Signal (SRS), the CIF is used for indicating the UE to send the aperiodic SRS triggered by the PDCCH to a component carrier used by the base station.
15. The method of claim 14, wherein the CIF is a CIF value or a component carrier index of a component carrier used by the UE for transmitting the aperiodic SRS.
16. The method of claim 14, wherein when the PDCCH triggers the UE to transmit the aperiodic SRS over a set of component carriers,
the CIF is a CIF value or a component carrier index of one component carrier in the group of component carriers; or,
the CIF is a group index number corresponding to the group of component carriers.
17. The method of claim 14, wherein the PDCCH is further used for scheduling a Physical Downlink Shared Channel (PDSCH); the method further comprises the following steps:
the UE transmits the PDSCH on a component carrier which can be scheduled by the PDCCH;
wherein, the component carrier used by the UE for sending the PDSCH is the component carrier for sending the PDCCH; or,
the component carrier used by the UE for sending the PDSCH is the component carrier with the maximum or minimum CIF value in the component carriers which can be scheduled by the PDCCH; or,
and the component carrier used by the UE for sending the PDSCH is the component carrier with the maximum or minimum component carrier index or cell index in the component carriers which can be scheduled by the PDCCH.
18. A base station for cross-carrier scheduling, comprising:
a configuration module, configured to configure a downlink component carrier configured to a User Equipment (UE) as a component carrier implementing cross-carrier scheduling of the UE when a system in which the base station is located is a Frequency Division Duplex (FDD) system, where an uplink component carrier corresponding to the downlink 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, instruct the UE to send a physical uplink shared channel PUSCH scheduled by the PDCCH to the base station on the uplink component carrier when the PDCCH triggers an aperiodic channel state information CSI report, or instruct the UE to send an aperiodic SRS triggered by the PDCCH to the base station on the uplink component carrier when the PDCCH triggers an aperiodic measurement reference signal SRS.
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