CN101917259A - Trigger method for aperiodic channel status information reports and base station - Google Patents
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Abstract
The invention discloses a trigger method for aperiodic channel status information reports and a base station. The method comprises the following steps of: sending a Physical Downlink Control Channel (PDCCH) with aperiodic CSI report trigger command to the user equipment by the base station; when the trigger command triggers the aperiodic CSI report, indicating the aperiodic CSI report about the component carrier back-fed and designated by the user equipment through the PDCCH. The invention enhances the flexibility of the aperiodic channel status information CSI reports, reduces the trigger delay of the aperiodic channel status information CSI reports, and saves the trigger signaling cost and the transmission cost.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a base station for triggering an aperiodic channel status information report.
Background
In a third Generation Partnership Project Long Term Evolution system (3 GPP LTF), 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: channel Quality Indication (CQI), Precoding Matrix Indication (PMI), and Rank Indication (RI).
In the LTE system, there are two ways of periodic feedback and aperiodic feedback for CSI feedback of a downlink channel by a UE, which are respectively referred to as periodic channel state information report (periodic CSI reporting) and aperiodic channel state information report (aperiodic CSI reporting). The periodic CSI report refers to periodic CSI feedback of the UE 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 primary CSI 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 sent to the scheduled UE by a Physical Downlink Control Channel (PDCCH) having a Downlink Control Information (DCI) format 0(format 0). 1bit in the DCI format0 is used to trigger the UE to perform aperiodic CSI reporting, which is called channel quality indication request (CQI request).
If the UE detects a PDCCH with a DCI format0 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 format0 is set to be '1', sending an aperiodic CSI report in the PUSCH scheduled by the DCI format 0.
An LTE-Advanced (LTE-a) system is a next generation evolution system of the LTE system, and a Carrier Aggregation (CA) technology is used to extend a transmission bandwidth and support a larger peak transmission rate. Fig. 1 is a schematic view 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). The multiple component carriers may be located in the same frequency band (frequency band) or may be located in different frequency bands.
When the base station configures (configures) or activates (activates) one or more component carriers for the ue to send downlink signals, the ue needs to feed back CSI to each configured (configured) or activated (activated) component carrier. According to a triggering mode of an aperiodic CSI report in an LTE system, for a Time Division Duplex (TDD) system, when a base station triggers a user equipment to feed back the aperiodic CSI report of a certain component carrier, the user equipment must be scheduled to send a PUSCH on the component carrier; for a Frequency Division Duplex (FDD) system, in order for a base station to trigger a user equipment to feed back an aperiodic CSI report of a Downlink Component Carrier (DL CC), the user equipment must be scheduled to transmit a PUSCH on an Uplink Component Carrier (UL CC) corresponding to the Downlink Component Carrier. And further, in a PDCCH with a specific downlink control information format (DCI format) for scheduling the PUSCH, transmitting a 1-bit trigger command, that is, a CQI request of 1, to trigger an aperiodic CSI report for the component carrier.
In addition, in the 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 user equipment by the base station.
The base station may configure or activate different numbers of uplink and downlink component carriers for the ue, as shown in fig. 2. The UE-specific Component Carrier (PCC) includes at least one pair of PCC, including a downlink PCC and an uplink PCC corresponding to the downlink PCC. The primary component carrier of different user equipment may be different. 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 for the user equipment.
When the aperiodic CSI is triggered to be reported by the UE, for example, the base station may need to trigger the aperiodic CSI report of each component carrier more frequently because the uplink and downlink services are asymmetric, and thus the base station needs to schedule the UE to send the PUSCH on the corresponding component carrier more frequently. It is also possible that the base station configures or activates a downlink component carrier DL CC for the UE, but does not configure or activate an uplink component carrier UL CC corresponding to the DL CC for the UE, and according to the triggering manner of the aperiodic CSI report in the LTE system, the base station cannot trigger the UE to feed back the aperiodic CSI report of the DL CC.
In summary, in the LTE-a system, the existing triggering method for aperiodic CSI reporting is not flexible enough, which may cause system resource waste or aperiodic CSI reporting of DL CCs that the UE cannot feed back.
Disclosure of Invention
The present invention is directed to a method and a base station for triggering aperiodic CSI reports, so as to solve at least the problem that the triggering method of the conventional aperiodic CSI report is not flexible.
According to an aspect of the present invention, there is provided a method for triggering aperiodic CSI report, including: the base station sends a Physical Downlink Control Channel (PDCCH) with an aperiodic CSI report triggering command to the user equipment, and when the triggering command triggers the aperiodic CSI report, the PDCCH instructs the user equipment to feed back the aperiodic CSI report of the appointed component carrier.
According to another aspect of the present invention, there is provided a base station including: and the instruction module is used for sending a Physical Downlink Control Channel (PDCCH) with an aperiodic CSI report triggering command to the user equipment, and when the triggering command triggers the aperiodic CSI report, the PDCCH instructs the user equipment to feed back the aperiodic CSI report of the specified component carrier.
According to the invention, the base station is adopted to indicate the UE to feed back the aperiodic CSI of the appointed one or more component carriers in the aperiodic CSI report instruction, so that the problem that the triggering mode of the aperiodic CSI report in the related technology is not flexible enough is solved, the flexibility of triggering the aperiodic CSI report is improved, the triggering time delay of the aperiodic CSI report is reduced, and the effects of triggering signaling cost and transmission cost are saved.
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 a user equipment of an LTE-a FDD system according to the related art;
fig. 3 is a flowchart illustrating the steps of a method for triggering aperiodic csi reports according to an embodiment of the present invention;
fig. 4 is a block diagram of a base station 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 the following embodiments of the present invention, a base station uses a PDCCH with a specific downlink control information format to send an aperiodic CSI report trigger command to a UE, and when a CQI request in the PDCCH with the specific downlink control information is 1, the PDCCH triggers the UE to feed back an aperiodic CSI report of one or a group of component carriers. Wherein, the specific downlink control information format is a downlink control information format for scheduling PUSCH, which includes but is not limited to DCIformat 0.
Referring to fig. 3, a flowchart illustrating steps of a method for triggering aperiodic csi report according to an embodiment of the present invention is shown, including the following steps:
step S302: the method comprises the steps that a base station sends a Physical Downlink Control Channel (PDCCH) with an aperiodic CSI report triggering command to user equipment, and when the triggering command triggers an aperiodic CSI report, the PDCCH indicates the user equipment to feed back an aperiodic CSI report of a specified component carrier.
In this step, the base station uses one component carrier to send the PDCCH, where the PDCCH includes an aperiodic CSI report trigger command, and the base station sends the PDCCH to the UE. One component carrier used by the base station may be a component carrier in a TDD system, and may also be a downlink component carrier in an FDD system. When the trigger command triggers an aperiodic CSI report, the base station indicates the UE to report the aperiodic CSI report of the appointed component carrier through the PDCCH. And after receiving the PDCCH, the UE feeds back an aperiodic CSI report of the designated component carrier. The designated component carrier may be designated as a component carrier corresponding to a component carrier transmitting the PUSCH scheduled by the PDCCH, such as a downlink component carrier corresponding to an uplink component carrier transmitting the PUSCH in an FDD system or a group of downlink component carriers to which the downlink component carrier belongs, or a component carrier transmitting the PUSCH in a TDD system or a group of component carriers to which the component carrier belongs. Of course, any one or a set of component carriers may be configured or activated for the UE.
In the related art, the triggering manner of the aperiodic CSI report is not flexible enough, which may cause waste of system resources or cause aperiodic CSI report of DL CCs that the UE cannot feed back. Through the embodiment, the base station indicates the UE to feed back the aperiodic CSI report of which one or more component carriers, so that the flexibility of the aperiodic CSI report is effectively improved, only the aperiodic CSI report of the specified component carrier is triggered, and the triggering signaling overhead and the transmission overhead of the aperiodic CSI report are reduced; and the aperiodic CSI reports of a plurality of component carriers are triggered at one time, so that the triggering signaling cost and the triggering time delay of the aperiodic CSI reports are effectively reduced.
Method 1
In an LTE-A system, a base station uses a PDCCH with a specific downlink control information format to send an aperiodic CSI report triggering command to a UE, and when a CQI request in the PDCCH with the specific downlink control information format is 1, the UE is triggered to feed back an aperiodic CSI report. The PDCCH with a specific downlink control information format schedules the UE to transmit PUSCH on one component carrier. When the CQI request in the PDCCH is 1, the PUSCH scheduled by the PDCCH is transmitted on which component carrier, indicating which component carrier or component carriers the trigger command triggers for aperiodic CSI reporting. In an FDD system, when the CQI request in the PDCCH is 1, the PDCCH schedules the PUSCH to be transmitted on the UL CC1, and then the aperiodic CSI report of the DL CC1 corresponding to the UL CC1 is triggered.
The corresponding relation between the component carrier wave for sending the PUSCH and the triggered component carrier wave for the aperiodic CSI report to be fed back is preset or configured by a high layer.
After the UE receives the PDCCH, if the CQI request in the PDCCH is 1, for a TDD system, if the PDCCH schedules user equipment to send a PUSCH on a certain component carrier, triggering the user equipment to feed back an aperiodic CSI report of the component carrier or a group of component carriers to which the component carrier belongs; for an FDD system, if a PDCCH schedules a user equipment to send a PUSCH on an uplink component carrier, the user equipment is triggered to feed back an aperiodic CSI report of a downlink component carrier corresponding to the uplink component carrier or a group of downlink component carriers to which the downlink component carrier corresponding to the uplink component carrier belongs. In the FDD system, the correspondence between the uplink and downlink component carriers is preset and notified to the user equipment by the base station.
Preferably, after receiving the PDCCH, the UE needs to determine whether the trigger command triggers an aperiodic CSI report of one or a group of component carriers if the CQI request in the PDCCH is 1. For example, the UE determines whether to feed back an aperiodic CSI report of one component carrier at a time or a set of component carriers at a time according to a UE aperiodic CSI reporting mode configured by the base station through high-level signaling.
When a trigger command triggers user equipment to feed back an aperiodic CSI report of a component carrier, for a TDD system, if the PDCCH schedules the user equipment to send a PUSCH on a certain component carrier, the user equipment is triggered to feed back the aperiodic CSI report of the component carrier; for an FDD system, if a PDCCH schedules user equipment to send a PUSCH on a certain uplink component carrier, the user equipment is triggered to feed back an aperiodic CSI report of a downlink component carrier corresponding to the uplink component carrier. In the FDD system, the correspondence between the uplink and downlink component carriers is preset and notified to the user equipment by the base station.
When a trigger command triggers the user equipment to feed back the aperiodic CSI reports of a group of component carriers, for a TDD system, if the PDCCH schedules the user equipment to send a PUSCH on a certain component carrier, the user equipment is triggered to feed back the aperiodic CSI reports of the group of component carriers to which the component carrier belongs, namely, part or all of the component carriers in the aggregation carrier to which the component carrier belongs; for an FDD system, if a PDCCH schedules a user equipment to send a PUSCH on a certain uplink component carrier, the user equipment is triggered to feed back an aperiodic CSI report of a group of downlink component carriers to which a downlink component carrier corresponding to the uplink component carrier belongs.
Preferably, a group of component carriers may contain one or more component carriers.
Preferably, a group of component carriers refers to a part or all of component carriers configured or activated by the ue (TDD system), or a part or all of downlink component carriers (FDD system), so as to improve flexibility of aperiodic CSI reporting.
Preferably, a set of component carriers is predetermined or configured by a higher layer.
Preferably, a group of component carriers refers to component carriers satisfying a certain preset condition among component carriers configured or activated by the ue.
For example, a group of Component carriers are Component carriers with Component Carrier index (CC index) modulo 2 congruence (i.e., the remainder is the same after modulo 2) in Component carriers configured or activated by the ue.
Or, in the FDD system, a group of component carriers is a downlink component carrier corresponding to the same uplink component carrier in the downlink component carriers configured or activated by the user equipment.
Or, in the FDD system, for a user equipment, if there is such a downlink secondary component carrier DL SCC, and its corresponding uplink component carrier is not configured or activated for the user equipment, all such downlink secondary component carriers and downlink primary component carriers of the user equipment are bound as a group of component carriers.
Or, a group of component carriers refers to component carriers configured with the same downlink transmission mode in component carriers configured or activated by the ue. In particular, if only one component carrier is configured or activated for a certain downlink transmission mode, the group of component carriers only includes one component carrier.
Or, a group of component carriers refers to component carriers configured with the same aperiodic CSI reporting mode among component carriers configured or activated by the ue.
Or, a group of component carriers refers to component carriers configured with the same downlink transmission mode and the same aperiodic CSI reporting mode in component carriers configured or activated by the ue.
Or, a group of component carriers refers to component carriers located in the same frequency band among component carriers configured or activated by the ue. In particular, if the ue only configures or activates one component carrier in a certain frequency band, the group of component carriers only includes one component carrier.
The specific requirements of the user equipment are met through the preset conditions.
Example one
In an FDD system, in a PDCCH with a specific downlink control information format, when a CQI request is 1 and the PDCCH schedules a user equipment to transmit a PUSCH on an uplink primary component carrier PCC, the user equipment is triggered to feed back an aperiodic CSI report of a set of downlink component carriers. The group of downlink component carriers of this embodiment includes: the downlink primary component carrier of the user equipment and the corresponding uplink component carrier of the downlink secondary component carrier configured or activated by the current user equipment are not configured or not activated for the user equipment (if the downlink secondary component carrier exists).
Otherwise, when the CQI request is 1 and the PDCCH schedules the ue to send the PUSCH on the uplink secondary component carrier SCC, triggering the ue to feed back the aperiodic CSI report of the downlink component carrier corresponding to the uplink secondary component carrier.
For example, in the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0 for the user equipment, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated). DL CC0, DL CC2 and DL CC3 are preset as a set of component carriers.
If the ue detects 1 PDCCH with specific downlink control information format belonging to the ue in one subframe, the PDCCH schedules the ue to send PUSCH on UL CC0, and the CQI request is 1, the ue is triggered to feedback aperiodic CSI reports of DL CC0, DL CC2 and DL CC 3.
If on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on UL CC1, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI report of DL CC 1.
Example two
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 for the user equipment (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated). Wherein, the high layer configuration DL CC0 and DL CC2 are a group of component carriers; DL CC1 and DL CC3 are a set of component carriers.
If on a subframe, when the ue detects 1 PDCCH with a specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on UL CC0, and where CQI request is 1, the ue is triggered to feed back aperiodic CSI reports of DL CC0 and DL CC 2.
If on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on UL CC1, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI reports of DL CC1 and DL CC 3.
EXAMPLE III
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 for the user equipment (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated). Wherein, the high layer configuration DL CC0 and DL CC2 are a group of component carriers; DL CC1 and DL CC3 are a set of component carriers.
When the base station configures a trigger command to trigger the UE to feed back an aperiodic CSI report of a component carrier:
if on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on UL CC0, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI report of DL CC 0.
If on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on UL CC1, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI report of DL CC 1.
When the base station configures a trigger command to trigger the UE to feed back aperiodic CSI reports of a group of component carriers:
if on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on UL CC0, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI reports of DL CC0 and DL CC 2.
If on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on UL CC1, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI reports of DL CC1 and DL CC 3.
Example four
In the TDD system, the base station configures or activates 1 primary component carrier CC0 and 1 secondary component carrier CC1 for the user equipment.
If a ue detects 1 PDCCH with specific downlink control information format belonging to the ue in one subframe, the PDCCH schedules the ue to send PUSCH on CC0, and where CQI request is 1, the ue is triggered to feed back aperiodic CSI reports of all currently configured or activated component carriers, i.e. CC0 and CC 1.
If on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on CC1, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI report of CC 1.
EXAMPLE five
In the TDD system, the base station configures or activates 1 primary component carrier CC0 and 1 secondary component carrier CC1 for the user equipment.
When the base station configures a trigger command to trigger the UE to feed back aperiodic CSI reports of a group of component carriers:
if a ue detects 1 PDCCH with specific downlink control information format belonging to the ue in one subframe, the PDCCH schedules the ue to send PUSCH on CC0, and where CQI request is 1, the ue is triggered to feed back aperiodic CSI reports of all currently configured or activated component carriers, i.e. CC0 and CC 1.
If on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on CC1, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI report of CC 1.
When the base station configures a trigger command to trigger the UE to feed back an aperiodic CSI report of a component carrier:
if on a subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on CC0, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI report of CC 0.
If on one subframe, when the ue detects 1 PDCCH with specific downlink control information format belonging to it, the PDCCH schedules the ue to send PUSCH on CC1, and where CQI request is 1, the ue is triggered to feedback aperiodic CSI report of CC 1.
Method two
In an LTE-A system, cross-carrier scheduling (cross-carrier scheduling) is supported, and uplink and downlink scheduling information of other component carriers is sent on one component carrier for a TDD system; for an FDD system, scheduling information of other downlink component carriers and uplink component carriers corresponding to the other downlink component carriers is sent on one downlink component carrier. Scheduling information is carried in a PDCCH with a specific downlink control information format (DCI format) and transmitted to the scheduled user equipment, and a Carrier Indicator Field (CIF) is introduced in the PDCCH to identify the scheduled component carriers. Whether cross-carrier scheduling is performed or not is configured by high-layer signaling.
In an LTE-A system, a base station uses a PDCCH with a specific downlink control information format to send an aperiodic CSI report triggering command to a UE, and when a CQI request in the PDCCH with the specific downlink control information format is 1, the UE is triggered to feed back an aperiodic CSI report. The PDCCH with a specific downlink control information format schedules the UE to transmit PUSCH on one component carrier. When the cross-carrier scheduling is carried out, the PDCCH contains CIF information, and the CIF information carried by the PDCCH indicates which one or which group of component carriers to trigger the aperiodic CSI report.
Preferably, the CIF indicates an index number of a triggered component carrier to which the aperiodic CSI is to be fed back.
Preferably, when the aperiodic CSI report triggering command triggers the user equipment to send an aperiodic CSI report of a plurality of component carriers, the CIF indicates an index number of one component carrier of the plurality of component carriers to which the aperiodic CSI is to be fed back.
Preferably, the CIF indicates a group index number corresponding to a plurality of triggered component carriers to which the aperiodic CSI is to be fed back.
The CIF information carried by the PDCCH also instructs the user equipment to transmit the PUSCH on a designated component carrier.
Or, when scheduling across carriers, the PDCCH with the aperiodic CSI report trigger command schedules the ue to transmit PUSCH on a default component carrier. Preferably, the default component carrier is a primary component carrier PCC of the user equipment.
EXAMPLE six
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 for the user equipment (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated). DL CC0, DL CC2 and DL CC3 are preset as a set of component carriers.
In cross-carrier scheduling, when a user equipment detects a PDCCH with a specific downlink control information format belonging thereto, and where CQI request is 1 and CIF is 0 (or 1), the user equipment is triggered to feed back an aperiodic CSI report of DL CC0 (or DL CC 1). The PDCCH schedules the user equipment to transmit PUSCH on UL CC0 (or UL CC 1).
When the user equipment detects a PDCCH with a specific downlink control information format, wherein the CQI request is 1, and the CIF is any integer value of 2-7, the user equipment is triggered to feed back aperiodic CSI reports of a DL CC0, a DL CC2 and a DL CC3, and the PDCCH schedules the user equipment to send the PUSCH on a UL CC 0.
Or,
when the user equipment detects a PDCCH with a specific downlink control information format and the CQI request is 1 and the CIF is 2 (or 3), the user equipment is triggered to feed back an aperiodic CSI report of a DL CC2 (or a DL CC3), and the PDCCH schedules the user equipment to transmit a PUSCH on a UL CC 0.
When the user equipment detects a PDCCH with a specific downlink control information format, wherein the CQI request is 1, and the CIF is any integer value of 4-7, the user equipment is triggered to feed back aperiodic CSI reports of a DL CC0, a DL CC2 and a DL CC3, and the PDCCH schedules the user equipment to send the PUSCH on a UL CC 0.
EXAMPLE seven
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 for the user equipment (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated). Wherein, the high layer configuration DL CC0 and DL CC2 are a group of component carriers; DL CC1 and DL CC3 are a set of component carriers.
In cross-carrier scheduling, when a user equipment detects a PDCCH with a specific downlink control information format belonging to the user equipment, and wherein CQI request is 1 and CIF is 0 (or 1), the user equipment is triggered to feed back an aperiodic CSI report of DL CC0 (or DL CC1), and the PDCCH schedules the user equipment to transmit a PUSCH on UL CC0 (or UL CC 1).
When the user equipment detects a PDCCH with a specific downlink control information format and wherein the CQI request is 1 and the CIF is 2, the user equipment is triggered to feed back aperiodic CSI reports of DL CC0 and DL CC2, and the PDCCH schedules the user equipment to transmit PUSCH on UL CC 0.
When the user equipment detects a PDCCH with a specific downlink control information format and wherein the CQI request is 1 and the CIF is 3, the user equipment is triggered to feed back aperiodic CSI reports of DL CC1 and DL CC3, and the PDCCH schedules the user equipment to transmit PUSCH on UL CC 1.
Example eight
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 for the user equipment (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated). Wherein, the high layer configuration DL CC0 and DL CC2 are a group of component carriers; DL CC1 and DL CC3 are a set of component carriers.
In cross-carrier scheduling, when a user equipment detects a PDCCH with a specific downlink control information format belonging to the user equipment, and wherein CQI request is 1 and CIF is 0 (or 1), the user equipment is triggered to feed back an aperiodic CSI report of DL CC0 (or DL CC1), and the PDCCH schedules the user equipment to transmit a PUSCH on UL CC0 (or UL CC 1).
When the base station configures a trigger command to trigger the UE to feed back an aperiodic CSI report of a component carrier:
when the user equipment detects a PDCCH with a specific downlink control information format and wherein the CQI request is 1 and the CIF is 2, the user equipment is triggered to feed back an aperiodic CSI report of the DL CC2, and the PDCCH schedules the user equipment to transmit a PUSCH on the UL CC 0.
When the user equipment detects a PDCCH with a specific downlink control information format and wherein the CQI request is 1 and the CIF is 3, the user equipment is triggered to feed back an aperiodic CSI report of the DL CC3, and the PDCCH schedules the user equipment to transmit a PUSCH on the UL CC 1.
When the base station configures a trigger command to trigger the UE to feed back aperiodic CSI reports of a group of component carriers:
when the user equipment detects a PDCCH with a specific downlink control information format and wherein the CQI request is 1 and the CIF is 2, the user equipment is triggered to feed back aperiodic CSI reports of DL CC0 and DL CC2, and the PDCCH schedules the user equipment to transmit PUSCH on UL CC 0.
When the user equipment detects a PDCCH with a specific downlink control information format and wherein the CQI request is 1 and the CIF is 3, the user equipment is triggered to feed back aperiodic CSI reports of DL CC1 and DL CC3, and the PDCCH schedules the user equipment to transmit PUSCH on UL CC 1.
Example nine
According to the prior art, a base station configures or activates 5 component carriers at most for one user equipment. When the user equipment detects a PDCCH (physical downlink control channel) with a specific downlink control information format, wherein the PDCCH belongs to the user equipment in cross-carrier scheduling, and a CQI request is 1, a CIF (common information function) is any integer value from 0 to 4, the user equipment is triggered to feed back an aperiodic CSI (channel state information) report of a corresponding component carrier. The corresponding component carrier is indicated by the CIF, e.g., indicating its carrier index number. By default, the PDCCH schedules the user equipment to send PUSCH on its primary component carrier.
When the UE detects a PDCCH with a specific downlink control information format, wherein the CQI request is 1, and the CIF is any one integer value of 5-7 or a preset integer value, the UE is triggered to feed back aperiodic CSI reports of all currently configured or activated component carriers/downlink component carriers. By default, the PDCCH schedules the user equipment to send PUSCH on its primary component carrier.
Example ten
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 for the user equipment (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated).
In cross-carrier scheduling, when a user equipment detects a PDCCH with a specific downlink control information format belonging to the user equipment, and wherein CQI request is 1, CIF jointly indicates which component carrier's aperiodic CSI report is triggered and on which component carrier the PDCCH schedules the user equipment to transmit PUSCH, as shown in table 1.
TABLE 1
The table is set in both the base station and the user equipment, the base station sends CIF information according to the table, and the user equipment determines triggered component carriers to be fed back with the aperiodic CSI report and component carriers to send PUSCH according to the table. By the above table, the speed and efficiency of feeding back the aperiodic CSI are improved.
It should be noted that the table is only an exemplary illustration, and those skilled in the art can flexibly set the contents in the table according to the actual situation, and the present invention is not limited to this.
EXAMPLE eleven
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0 for the user equipment, 1 pair of secondary component carriers DL CC1 and UL CC1, and 1 downlink secondary component carrier DL CC2 (the uplink secondary component carrier UL CC2 corresponding thereto is not configured or activated).
In cross-carrier scheduling, when a user equipment detects a PDCCH with a specific downlink control information format belonging to the user equipment, and where CQI request is 1, CIF jointly indicates which one or which component carrier's aperiodic CSI report is triggered and on which component carrier the PDCCH schedules the user equipment to transmit PUSCH, as shown in table 2.
TABLE 2
The table is set in both the base station and the user equipment, and in table 2, when the CIF values are 6 and 7, the aperiodic CSI of a group of component carriers is triggered and fed back, and such an index number corresponding to the group of component carriers is referred to as a group index number in the embodiment of the present invention. It should be noted that the table is only an exemplary illustration, and those skilled in the art can flexibly set the contents in the table according to the actual situation, and the present invention is not limited to this.
Example twelve
In the TDD system, a base station configures or activates 1 primary component carrier CC0 and 1 secondary component carrier CC1 for a user equipment.
In cross-carrier scheduling, when a user equipment detects a PDCCH with a specific downlink control information format belonging to the user equipment, and where CQI request is 1, CIF jointly indicates which one or which component carrier's aperiodic CSI report is triggered and on which component carrier the PDCCH schedules the user equipment to transmit PUSCH, as shown in table 3.
TABLE 3
The table is set in both the base station and the user equipment, and in table 3, when the CIF values are 4 and 5, the aperiodic CSI of a group of component carriers is triggered and fed back, and such an index number corresponding to the group of component carriers is referred to as a group index number in the embodiment of the present invention. It should be noted that the table is only an exemplary illustration, and those skilled in the art can flexibly set the contents in the table according to the actual situation, and the present invention is not limited to this.
Method III
In a PDCCH having a specific downlink control information format, when a CQI request is 1, an aperiodic CSI report indicating which one or which set of component carriers is triggered is indicated in the PDCCH. Preferably, the aperiodic CSI report triggering the user equipment to feed back which or which set of component carriers is indicated by N bits in the PDCCH.
This N bits may be referred to as an aperiodic CSI report component carrier indication field.
Preferably, the N bits indicates an index number of a triggered component carrier to which the aperiodic CSI is to be fed back.
Preferably, when the aperiodic CSI report triggering command triggers the user equipment to send the aperiodic CSI report of the multiple component carriers, the N bits indicates the index number of one component carrier of the multiple component carriers to which the aperiodic CSI is to be fed back.
Preferably, the N bits indicate a group index number corresponding to a plurality of component carriers to be fed back with aperiodic CSI.
Preferably, N.ltoreq.3. The triggered component carrier is convenient to rapidly determine through the index number, N is less than or equal to 3, the system requirement can be met, and the signaling overhead is saved.
Besides the CQI request, the uplink scheduling information in the DCI format0 includes: a 1-bit frequency hopping flag bit (hopping flag) for indicating frequency hopping enable; resource block allocation and frequency hopping resource allocation; 5 bits modulation coding scheme Index (MCS Index, IMCS); a 1-bit New Data Indicator (NDI); 2bits is used for a transmission power control command (TPC command for scheduled PUSCH) of the scheduled PUSCH; cyclic shift for DM RS (3 bits demodulation reference signal) and the like.
When the CQI request is 0 (i.e. when an aperiodic CSI report is not triggered), the N bits is used to indicate uplink scheduling information of the scheduled PUSCH, such as whether frequency hopping is enabled and/or modulation and coding scheme index and/or cyclic shift of transmission power control command and/or demodulation reference signal and OCC and/or new data indication NDI.
EXAMPLE thirteen
In a PDCCH with a specific downlink control information format, when the CQI request is 1, 3bits are used in the PDCCH to indicate which or which group of component carriers to trigger the ue to feed back the aperiodic CSI report, as shown in table 4.
TABLE 4
In the PDCCH having the specific downlink control information format, when the CQI request is 0, 3bits in the PDCCH are a hopping flag bit, the highest bit (or the lowest bit) of a modulation and coding scheme index, and the highest bit (or the lowest bit) of a cyclic shift of a demodulation reference signal, respectively.
When the user equipment detects a PDCCH with a specific downlink control information format belonging to the user equipment, and the CQI request is 1, the aperiodic CSI report of one or a group of corresponding component carriers is triggered to be fed back according to 3 bits. And the scheduled PUSCH default frequency hopping is not enabled (or enabled), the value range of the modulation and coding scheme index is 0 to 15 (or 16 preset integer values in 0 to 31), and the value range of the cyclic shift of the scheduled PUSCH demodulation reference signal is 4 preset values in {0, 2, 3, 4, 6, 8, 9, 10 }.
When the user equipment detects a PDCCH which belongs to the user equipment and has a specific downlink control information format, and a CQI request is 0, 1bit in the 3bits is a frequency hopping flag bit, and if the CQI request is '1', the scheduled PUSCH is enabled in frequency hopping; if the 1bit is '0', the scheduled PUSCH frequency hopping is not enabled; 1bit of the 3bits is the highest bit (or the lowest bit) of a modulation and coding mode index, and the value range of the modulation and coding mode index of the scheduled PUSCH is 0-31; and 1bit of the 3bits is the highest bit (or the lowest bit) of the cyclic shift of the demodulation reference signal, and the value range of the modulation and coding scheme index of the scheduled PUSCH is {0, 2, 3, 4, 6, 8, 9, 10 }.
Example fourteen
In the FDD system, the base station configures or activates 1 pair of primary component carriers DL CC0 and UL CC0, 1 pair of secondary component carriers DL CC1 and UL CC1, and 2 downlink secondary component carriers DL CC2 and DL CC3 for the user equipment (the corresponding uplink secondary component carriers UL CC2 and UL CC3 are not configured or activated). Wherein, the high layer configuration DL CC0 and DL CC2 are a group of component carriers; DL CC1 and DL CC3 are a set of component carriers.
When the base station configures a trigger command to trigger the UE to feed back an aperiodic CSI report of a component carrier:
in a PDCCH with a specific downlink control information format, when a CQI request is 1, a 1-bit indication is used in the PDCCH to trigger the ue to feed back an aperiodic CSI report of which component carrier, as shown in table 5.
TABLE 5
When the base station configures a trigger command to trigger the UE to feed back aperiodic CSI reports of a group of component carriers:
in a PDCCH with a specific downlink control information format, when a CQI request is 1, a 1-bit indication is used in the PDCCH to trigger the ue to feed back an aperiodic CSI report of which component carrier, as shown in table 6.
TABLE 6
In a PDCCH with a specific downlink control information format, when a CQI request is 0, the 1bit in the PDCCH is a frequency hopping flag bit.
When the user equipment detects a PDCCH with a specific downlink control information format belonging to the user equipment, and the CQI request is 1, the aperiodic CSI report of one or a group of corresponding component carriers is triggered and fed back according to the 1 bit. And the scheduled PUSCH default hopping is not enabled (or enabled).
When the user equipment detects a PDCCH which belongs to the user equipment and has a specific downlink control information format, and a CQI request is 0, the 1bit is a frequency hopping flag bit, and if the CQI request is '1', the scheduled PUSCH is enabled in frequency hopping; if the 1bit is '0', the scheduled PUSCH frequency hopping is not enabled.
Referring to fig. 4, a block diagram of a base station according to an embodiment of the present invention is shown.
The base station 40 of the present embodiment includes: an instruction module 402, configured to send a physical downlink control channel PDCCH with an aperiodic CSI report trigger command to a user equipment, and when the trigger command triggers an aperiodic CSI report, instruct the user equipment to feed back an aperiodic CSI report of a specified component carrier through the PDCCH.
Preferably, the instruction module 402 includes: a first instruction module 4022, configured to send a physical downlink control channel PDCCH with an aperiodic CSI report trigger command to a user equipment, schedule the user equipment to send a physical uplink shared channel PUSCH on one component carrier through the PDCCH, and instruct the user equipment to feed back an aperiodic CSI report of an assigned component carrier by using the component carrier when the trigger command triggers the aperiodic CSI report;
preferably, the designated component carrier is one or a group of component carriers corresponding to a component carrier for transmitting PUSCH, and the correspondence relationship is preset by the system or configured by a system higher layer.
Preferably, the instruction module 402 includes: a second instruction module 4024, configured to, when cross-carrier scheduling is performed, send a physical downlink control channel PDCCH with an aperiodic CSI report trigger command to a user equipment when the PDCCH further carries a carrier indication field CIF, where the CIF is used to indicate information of the specified component carrier, and when the trigger command triggers an aperiodic CSI report, instruct the user equipment to feed back an aperiodic CSI report of the specified component carrier through the CIF carried by the PDCCH.
Preferably, the instruction module 402 includes: and a third instruction module, configured to send a physical downlink control channel PDCCH with an aperiodic CSI report trigger command to the ue when the PDCCH also carries information of the specified component carrier, and instruct the ue to feed back an aperiodic CSI report of the specified component carrier through the information of the specified component carrier carried by the PDCCH when the trigger command triggers an aperiodic CSI report.
Preferably, the information of the designated component carrier is an index number of the designated component carrier.
Preferably, the length of the designated component carrier information is less than or equal to 3 bits.
The base station may only be provided with any one of the first instruction module 4022, the second instruction module 4024, and the third instruction module, or the base station may be provided with both the first instruction module 4022 and the second instruction module 4024.
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 (23)
1. A method for triggering aperiodic CSI report, comprising:
the method comprises the steps that a base station sends a Physical Downlink Control Channel (PDCCH) with an aperiodic CSI report triggering command to user equipment, and when the triggering command triggers an aperiodic CSI report, the PDCCH indicates the user equipment to feed back an aperiodic CSI report of a specified component carrier.
2. The method of claim 1, wherein the designated component carrier is one or more component carriers.
3. The method of claim 1, wherein the step of the base station instructing the UE to feed back aperiodic CSI reports for the designated component carriers through PDCCH comprises:
and the PDCCH schedules the user equipment to send a Physical Uplink Shared Channel (PUSCH) on one component carrier, and the base station uses the component carrier for sending the PUSCH to indicate the user equipment to feed back an aperiodic CSI report of the specified component carrier.
4. The method according to claim 3, wherein the designated component carrier is one or more component carriers corresponding to the component carrier for transmitting PUSCH, and the correspondence relationship is preset by a system or configured by the system higher layer.
5. The method of claim 3, wherein the PDCCH schedules the UE to transmit a PUSCH (physical uplink shared channel) on one component carrier, and the step of the base station using the PUSCH-transmitted component carrier to instruct the UE to feed back aperiodic CSI reports of the specified component carrier comprises:
and the PDCCH schedules the user equipment to send a Physical Uplink Shared Channel (PUSCH) on a preset component carrier, and the base station uses the component carrier for sending the PUSCH to indicate the user equipment to feed back aperiodic CSI reports of all currently configured or activated component carriers.
6. The method of claim 5, wherein the predetermined component carrier is a primary component carrier of the UE
7. The method of claim 3, wherein in a Frequency Division Duplex (FDD) system, the PDCCH schedules the user equipment to transmit a Physical Uplink Shared Channel (PUSCH) on one component carrier, and the step of the base station using the PUSCH-transmitted component carrier to instruct the user equipment to feed back aperiodic CSI reports of the specified component carrier comprises:
the PDCCH schedules the user equipment to send PUSCH on a preset uplink component carrier, the base station uses the component carrier for sending the PUSCH to indicate the user equipment to feed back an aperiodic CSI report of a component carrier of a designated downlink component carrier, and the designated downlink component carrier comprises: the downlink component carrier corresponding to the preset uplink component carrier, and the downlink component carrier which is not configured or activated for the user equipment by the uplink component carrier corresponding to the downlink component carrier currently configured or activated for the user equipment.
8. The method of claim 7, wherein the predetermined uplink CC is an uplink primary CC of the UE.
9. The method of claim 1, wherein the PDCCH carries information of the designated component carrier.
10. The method of claim 1, wherein in cross-carrier scheduling, the PDCCH uses a Carrier Indication Field (CIF) to carry information of the designated component carrier.
11. The method of claim 10, further comprising:
and the PDCCH schedules the user equipment to send a Physical Uplink Shared Channel (PUSCH) on a component carrier wave which is defaulted by a system.
12. The method of claim 11, wherein the system default component carrier is a primary component carrier of the UE.
13. The method of claim 10, wherein the CIF further carries information indicating a component carrier for transmitting the PUSCH scheduled by the PDCCH, and wherein the PDCCH schedules the user equipment to transmit the PUSCH on the component carrier for transmitting PUSCH indicated by the CIF.
14. The method of any of claims 11 to 13, further comprising:
the user equipment feeds back an aperiodic CSI report of the designated component carrier by using the PUSCH.
15. The method according to claim 9 or 10, wherein the information of the designated component carrier is an index number of the designated component carrier.
16. The method of claim 15, wherein the designated component carrier comprises a plurality of component carriers, and wherein the index number of the designated component carrier is an index number of one of the plurality of component carriers or a group index number corresponding to the plurality of component carriers.
17. The method according to claim 9 or 10, wherein the length of the information of the designated component carrier is less than or equal to 3 bits.
18. The method according to claim 9, wherein an aperiodic CSI report component carrier indication field is set in the PDCCH for indicating information of the specified component carrier; when the trigger command does not trigger aperiodic CSI report, the aperiodic CSI report component carrier indication field in the PDCCH is used for indicating uplink scheduling information of the PUSCH scheduled by the PDCCH.
19. A base station, comprising:
and the instruction module is used for sending a Physical Downlink Control Channel (PDCCH) with an aperiodic CSI report triggering command to the user equipment, and when the triggering command triggers an aperiodic CSI report, the PDCCH indicates the user equipment to feed back the aperiodic CSI report of the specified component carrier.
20. The base station of claim 19, wherein the instruction module comprises:
the system comprises a first instruction module and a second instruction module, wherein the first instruction module is used for sending a Physical Downlink Control Channel (PDCCH) with an aperiodic CSI report triggering command to user equipment, the PDCCH is used for scheduling the user equipment to send a Physical Uplink Shared Channel (PUSCH) on a component carrier, and when the triggering command triggers an aperiodic CSI report, the component carrier sending the PUSCH is used for indicating the user equipment to feed back the aperiodic CSI report of a specified component carrier.
21. The base station of claim 19, wherein in cross-carrier scheduling, the PDCCH further carries a carrier indication field CIF, and the CIF is used for indicating information of the designated component carrier; the instruction module comprises:
and the second instruction module is used for sending a Physical Downlink Control Channel (PDCCH) with an aperiodic CSI report triggering command to the user equipment, and when the triggering command triggers an aperiodic CSI report, indicating the user equipment to feed back the aperiodic CSI report of the specified component carrier through a common information Channel (CIF) carried by the PDCCH.
22. The base station of claim 19, wherein the PDCCH further carries information of the designated component carrier; the instruction module comprises:
and a third instruction module, configured to send a physical downlink control channel PDCCH with an aperiodic CSI report trigger command to a user equipment, and when the trigger command triggers an aperiodic CSI report, instruct the user equipment to feed back the aperiodic CSI report of the designated component carrier through information of the designated component carrier carried by the PDCCH.
23. The base station according to claim 21 or 22, wherein the information of the designated component carrier is an index number of the designated component carrier.
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| PCT/CN2010/080427 WO2012022103A1 (en) | 2010-08-16 | 2010-12-29 | Method and base station for triggering aperiodic channel state information report |
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| US11082875B2 (en) | 2018-09-27 | 2021-08-03 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for determining trigger state, terminal device, and network device |
| CN111865528A (en) * | 2019-04-29 | 2020-10-30 | 中国移动通信有限公司研究院 | Method and device for triggering reporting of channel state information |
| WO2021163959A1 (en) * | 2020-02-20 | 2021-08-26 | Qualcomm Incorporated | Transmission order determination for aperiodic channel state information |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012022103A1 (en) | 2012-02-23 |
| CN101917259B (en) | 2016-06-15 |
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