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WO2012094990A1 - Procédé et dispositif de transmission de csi - Google Patents

Procédé et dispositif de transmission de csi Download PDF

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Publication number
WO2012094990A1
WO2012094990A1 PCT/CN2012/070194 CN2012070194W WO2012094990A1 WO 2012094990 A1 WO2012094990 A1 WO 2012094990A1 CN 2012070194 W CN2012070194 W CN 2012070194W WO 2012094990 A1 WO2012094990 A1 WO 2012094990A1
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WO
WIPO (PCT)
Prior art keywords
csi
information
reporting
grant
user equipment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/070194
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English (en)
Chinese (zh)
Inventor
李超君
吕永霞
范霄安
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
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Publication of WO2012094990A1 publication Critical patent/WO2012094990A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a CSI transmission method and apparatus.
  • the UE in order to support the downlink adaptive scheduling, the UE needs to report the channel state information of the downlink carrier to the base station (CSI).
  • CSI base station
  • the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), and a Rank Indicator (RI).
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • the CSI report includes periodic CSI reporting (RT Reporting) and aperiodic CSI reporting.
  • Period Reporting in which, when there is no uplink data transmission, the periodic CSI is transmitted through the physical layer uplink control channel PUCCH (Physical Uplink Control Channel), and when the uplink data is transmitted, the physical uplink shared channel PUSCH (Physical Uplink Shared Channel) ) Transmit; Aperiodic CSI is sent over the PUSCH.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • LTE-A Long Term Evolution Advanced
  • CA Carrier Aggregation
  • the periodic CSI needs to be configured on the PUSCH for transmission to ensure transmission accuracy.
  • how to schedule the transmission of periodic CSI on the PUSCH is a problem that needs to be solved.
  • the method for configuring by high-level signaling proposed in the prior art is a semi-static configuration, and the scheduling information of the flexible configuration period CSI cannot be implemented.
  • a main object of the embodiments of the present invention is to provide a CSI transmission method and apparatus, which can flexibly configure CSI scheduling information.
  • an embodiment of the present invention provides a method for transmitting a CSI, including:
  • the base station sends the transmission configuration information of the channel state information CSI to the user equipment, where the transmission configuration information includes the transmission mode information and the reporting time information, where the transmission mode information is used to indicate that the user equipment reports the CSI through the physical layer uplink shared channel PUSCH.
  • the reporting time information is used to indicate a time when the user equipment reports the CSI;
  • the base station sends scheduling information of the CSI to the user equipment by using an uplink grant information UL Grant (Uplink Grant);
  • the base station receives the CSI reported by the user equipment according to the transmission configuration information and the scheduling information.
  • an embodiment of the present invention provides a CSI transmission method, including: receiving, by a user equipment, transmission configuration information of a CSI sent by a base station, where the transmission configuration information includes transmission mode information and reporting time information, The transmission mode information is used to indicate that the user equipment reports the CSI through the physical layer uplink shared channel PUSCH, where the reporting time information is used to indicate the time when the user equipment reports the CSI;
  • the base station reports the CSI.
  • an embodiment of the present invention provides a base station, including:
  • a sending unit configured to send the transmission configuration information of the channel state information CSI to the user equipment, where the transmission configuration information includes the transmission mode information and the reporting time information, where the transmission mode information is used to indicate that the user equipment uses the physical layer to uplink the shared channel.
  • the PUSCH reports the CSI, where the reporting time information is used to indicate the time of the CSI on the user equipment, and the CSI scheduling information is sent to the user equipment by using the uplink grant information UL Grant;
  • the first receiving unit is configured to receive the CSI that is reported by the user equipment according to the transmission configuration information sent by the sending unit and the scheduling information.
  • an embodiment of the present invention provides a user equipment, including:
  • a second receiving unit configured to receive transmission configuration information of the CSI sent by the base station, where the transmission configuration information includes transmission mode information and reporting time information, where the transmission mode information is used to indicate that the user equipment uses the physical layer uplink shared channel PUSCH The CSI is reported, where the reporting time information is used to indicate the time when the user equipment reports the CSI; and the scheduling information of the CSI sent by the base station to the user equipment by using the UL Grant is received;
  • the reporting unit is configured to report the CSI to the base station by using the PUSCH according to the transmission configuration information and the scheduling information received by the second receiving unit.
  • the base station After the foregoing technical solution, the method for transmitting CSI, the base station, and the user equipment provided by the embodiment of the present invention, the base station notifies the user equipment to report the CSI by using the PUSCH, and then sends the scheduling information of the CSI through the UL Grant, so that the user equipment is designated according to the UL Grant.
  • the scheduling information is reported by the CSI. Therefore, the base station can perform flexible configuration of CSI scheduling information by using the UL Grant.
  • FIG. 1 is a flowchart of a method for transmitting CSI according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for transmitting CSI according to an embodiment of the present invention
  • FIG. 3 is another flowchart of a method for transmitting CSI according to an embodiment of the present invention.
  • Fig. 4 is a view showing an example of the upper ⁇ time determined in the method shown in Fig. 3.
  • Fig. 5 is another exemplary diagram of the reporting time determined in the method shown in Fig. 3.
  • FIG. 6 is a flowchart of a method for transmitting CSI according to an embodiment of the present invention.
  • FIG. 7 is a structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 8 is another structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 9 is another structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a user equipment according to an embodiment of the present invention.
  • the CSI may feed back at least one of the following information: RI, wideband, wideband CQI, and subband CQI.
  • the cell carrier in the present invention may also be replaced by the concept of a cell, such that the primary cell carrier is also referred to as a primary cell (PCell, Primary Cell), and the secondary component carrier is also referred to as a secondary cell (SCell).
  • a CSI transmission method based on a base station, includes:
  • Step 101 The base station sends the CSI transmission configuration information to the user equipment.
  • the transmission configuration information includes transmission mode information and reporting time information, where The transmission mode information is used to indicate that the user equipment reports the CSI through the physical layer uplink shared channel PUSCH, where the reporting time information is used to indicate the time when the user equipment reports the CSI.
  • Step 102 The base station sends the scheduling information of the CSI to the user equipment by using the uplink grant information UL Grant.
  • the scheduling information of the CSI is used to indicate the frequency domain resource for reporting the CSI by the user equipment, and the related scheduling parameters that need to be followed when reporting the CSI, such as the Modulation and Coding Scheme (MCS).
  • MCS Modulation and Coding Scheme
  • Step 103 The base station receives the CSI reported by the user equipment according to the transmission configuration information and the scheduling information.
  • the method for transmitting CSI provided by the embodiment of the present invention, the base station notifies the user equipment in advance
  • the CSCH reports the CSI, and then sends the scheduling information of the CSI through the UL Grant, so that the user equipment performs the CSI reporting according to the scheduling information specified by the UL Grant. Therefore, the base station can flexibly configure the CSI scheduling information through the UL Grant. Moreover, the base station can select an appropriate frequency domain resource and MCS for the user equipment according to the channel quality change, and can more effectively utilize the frequency domain resource.
  • a CSI transmission method based on the user equipment served by the base station, includes:
  • Step 201 The user equipment receives transmission configuration information of the CSI sent by the base station.
  • the transmission configuration information includes the transmission mode information and the reporting time information, where the transmission mode information is used to indicate that the user equipment reports the CSI through the physical layer uplink shared channel (PUSCH), and the reporting time information is used to indicate that the user equipment reports the CSI.
  • the transmission mode information is used to indicate that the user equipment reports the CSI through the physical layer uplink shared channel (PUSCH)
  • the reporting time information is used to indicate that the user equipment reports the CSI.
  • Step 202 The user equipment receives scheduling information of the CSI sent by the base station to the user equipment by using a UL Grant.
  • Step 203 The user equipment reports the CSI to the base station by using the PUSCH according to the transmission configuration information and the scheduling information. Specifically, the user equipment reports the CSI to the base station by using the PUSCH on the frequency domain resource indicated by the scheduling information at the reporting time indicated by the transmission configuration information.
  • the user equipment can use the PUSCH in the configuration and scheduling of the base station, and perform CSI reporting according to the frequency domain resource specified by the UL Grant. Therefore, the base station can perform CSI scheduling information by using the UL Grant. Flexible configuration.
  • the user equipment can transmit CSI on the preferred channel configured by the base station, which enables the frequency domain resource utilization to be more effective.
  • the following describes the transmission method of the CSI of the present invention by using a specific embodiment. The following specific embodiment is described by taking the periodic CSI as an example. It can be understood that the present invention is not limited thereto.
  • the CSI is specifically the CSI of the downlink component carrier.
  • the downlink component carriers in a CA system are grouped, and the downlink component carriers are divided into at least one group.
  • the specific packet mode may be configured by the base station by using high-layer signaling. It can also be pre-defined. For example, the frequency band (band) of the downlink component carrier may be grouped.
  • the downlink component carrier of the band 3 and the band 7 when used for carrier aggregation, all the downlink component carriers of the band 3 are a group, and all the downlinks of the band 7 are downlink.
  • the group of carriers is a group; the grouping of the carrier of the downlink unit carrier is also performed.
  • the primary component carrier (PCC) and the secondary component carrier (SCC) are divided into different groups. It should be noted that, preferably, the fewer the packets, the simpler the scheduling of the base station, that is, the simpler and more effective for reporting time planning and resource allocation.
  • this embodiment includes:
  • Step 301 The base station determines the reporting time information of the periodic CSI of the downlink component carrier.
  • the reporting time information includes a reporting period N P of the CSI of the downlink component carrier and a starting offset N OTFSET in the N P , and the user equipment is based on the received N P and N OFFSET , the periodic CSI reporting time is calculated according to the formula (1), that is, the time when the formula (1) is satisfied is the reporting time of the period CSI.
  • n f the system frame number
  • n s the slot number within a radio frame ( Slot number ).
  • the determined reporting time information causes a collision of the reporting time of the CSI of each downlink component carrier to be maximized, that is, reporting as much as possible, so as to more effectively utilize the frequency domain resources.
  • the N P value and the N OFFSET value are the same, and the CSI reporting time information of the downlink component of the different group determined by the base station is determined.
  • the N P values are different, the N OFFSET values are the same, and the small N P value is a factor of the large N P value, that is, the small N P value must be divisible by the large N P value.
  • each 'square' represents 1 millisecond (ms)
  • the N OFFSETs of group 1 and group 2 are the same
  • the periodic CSI of group 1 is N.
  • P is 5ms
  • the Np of the periodic CSI of the group 2 is 10ms
  • the N P of the periodic CSI of the group 1 is the factor of the N P of the periodic CSI of the group 2, so that as shown in FIG. 4, the group 1 and the group 2 will be The collision that maximizes the time of the report.
  • the standard can only define the relationship of the NP value, and the NOFFSET value is implemented by the base station by implementing an algorithm.
  • the principle of the algorithm is to maximize the collision of the periodic CSI reporting time of each downlink component carrier, that is, report as much as possible at the same time. .
  • the base station determines the periodic CSI reporting time information of the downlink unit carrier as follows:
  • the reporting period determines the CSI reporting time information of the downlink unit carrier, where the reporting time information includes N P of the CSI of the downlink unit carrier and N OFFSET in the N P.
  • the determined reporting time information causes a collision of the reporting time of the periodic CSI of each downlink component carrier and the reporting time of the service data of the SPS data service to be maximized, that is, reporting as much as possible at the same time to perform more on the frequency domain resource. Effective use.
  • the N P value of the CSI information of the CSI of the at least one downlink component carrier determined by the base station is the same as the initial offset value of the SPS data service in one transmission period;
  • the transmission period of the SPS data service is greater than the CSI of at least one group of downlink unit carriers
  • N P the time information of the CSI of the at least one set of downlink component carriers determined in the base station, N OTFSET value with the SPS data service within the same initial offset value in a transmission cycle, N p value a factor of a transmission period value of the SPS data service;
  • the N OTFSET value and the SPS data service in the CSI reporting time information of the at least one group of downlink unit carriers determined by the base station The starting offset values are the same in one transmission period, and the Np value is a multiple of the transmission period value of the SPS data service.
  • the CSI period group 1 N P is 5ms
  • the CSI period group 2 N P is 10ms
  • the transmission cycle of SPS data traffic is 20ms
  • period group 1 of the CSI N P is the group N P cycle 2 CSI factor
  • groups 1 and period 2 the CSI N P is the transmission cycle of SPS data traffic factors, and therefore, transmission of SPS data traffic
  • the reporting time of the periodic CSI of Group 1 and Group 2 will maximize the collision.
  • Subframe Offset (sub-subset)
  • the frame offset can be configured as "0" or a specific value.
  • the period can be fine-tuned.
  • the transmission time is: 0, 9, 20, 29, 30, the downlink of each group determined by the base station.
  • the reporting time of the periodic CSI of the component carrier needs to be fine-tuned according to the service data transmission period of the SPS data service.
  • the standard can only define the relationship of the N P value, and the N OTFSET value is implemented by the base station by implementing an algorithm.
  • the principle of the algorithm is to enable the reporting time of the periodic CSI of each downlink component carrier and the transmission of the service data of the SP S data service. The moment of maximum collision.
  • the manner in which the base station determines the reporting time information of the periodic CSI of the downlink component carrier can make the resource allocation more efficient and the spectrum utilization rate higher.
  • ⁇ sets the periodic CSI of group 1 and group 2 to be independent of >3 ⁇ 4, each requires 0.5 resource blocks RB (Resource Block), and since the frequency domain resources are in RB units.
  • the allocation is performed. Therefore, an integer number of RBs will be allocated when an integer number of RBs are not required for information transmission. That is to say, if the periodic CSI of group 1 and group 2 are separately reported, 1 RB is required, and when the SPS data service data is reported, 2 RB is required. That is, a total of 4 RBs are required.
  • the periodic CSI and SPS of the group 1 and group 2 are The data service will appear at the time of reporting/transmission together. In this case, only 3 RBs are needed, thus improving spectrum utilization.
  • the manner in which the base station determines the reporting time information of the periodic CSI of the downlink unit carrier can also reduce the reporting/transmission time, which is beneficial to the user equipment to save power.
  • Step 302 The base station sends the transmission configuration information of the periodic CSI to the user equipment by using the high layer signaling.
  • the transmission configuration information includes the transmission mode information and the reporting time information, where the transmission mode information is used to indicate that the user equipment uses the physical layer uplink shared channel PUSCH reporting period CSI, and the reporting time information is the reporting time determined in step 301.
  • the information is used to indicate the time when the user equipment reports the periodic CSI, that is, the time at which the user equipment needs to report the periodic CSI.
  • the base station sends the periodic CSI transmission configuration information to the user equipment by using the RRC (Radio Resource Control) signaling, and the base station may also send the periodic CSI transmission configuration information through other high layer signaling.
  • RRC Radio Resource Control
  • the invention is not limited thereto.
  • the bit field may be added to the high layer signaling, and the bit field is used to indicate that the user equipment reports the periodic CSI through the PUSCH; or, the specific high layer signaling may carry the specific A transmission mode identifier, the specific transmission mode identifier is used to indicate that the user equipment passes the >3 ⁇ 4 cycle CSI on the PUSCH.
  • the reporting time information includes a reporting period N P and a starting offset N OFFSET parameter in a reporting period, and the user equipment can determine the upper time of the periodic CSI according to the foregoing parameter.
  • the transmission configuration information of the periodic CSI of different downlink component carriers is independently configured, that is, the periodic CSI of each downlink component carrier. Both the transmission mode information and the reporting time information need to be configured independently. Alternatively, it may be configured together with the transmission configuration information of the periodic CSI of a group of downlink component carriers.
  • Step 303 The base station configures a UL Grant for sending CSI scheduling information to the user equipment.
  • UL Grant you can flexibly configure scheduling information. For example, you can select the most suitable frequency domain resource to report CSI according to the change of the wireless channel.
  • the user equipment may send data on the PUSCH, may also send CSI, or may send data and CSI together.
  • the scheduling information of the PUSCH is indicated by the UL Grant, and how to distinguish the case where there is no data, that is, the UL Grant does not include the scheduling information of the data, and the UL Grant needs to be further designed, as follows.
  • the data in the present invention refers to a transport block (Transport Block) carried on an uplink shared channel (UL-SCH), which may be dynamically scheduled (referred to as Dynamic data) can also be semi-persistently scheduled (referred to as semi-persistent scheduling data in the present invention).
  • the UL-SCH is a type of transport channel (Transport Channel), that is, an information transmission service from the physical layer to the MAC (Medium Access Control).
  • the semi-persistent scheduling mechanism is used, and the scheduling information of the periodic CSI configured by the base station to the user equipment is semi-persistent scheduling information, which means that the scheduling information of the UL Grant indication (such as: frequency domain resource allocation, MCS, etc.)
  • the periodic CSI reporting time effectively lasts for a period of time until the new UL Grant occurs, and the scheduling information is changed, and then the scheduling information is periodically and effectively continued for a period of time until the new UL Grant reappears.
  • the base station can configure the appropriate frequency domain resources and the MCS for the user equipment according to the channel quality change, so that the frequency domain resources can be more effectively utilized.
  • the UL Grant may include semi-persistent scheduling information of periodic CSI, or semi-persistent scheduling information of semi-persistent scheduling SPS data, or semi-persistent scheduling information of periodic CSI and semi-persistent scheduling information of semi-persistent scheduling SPS data.
  • the semi-persistent scheduling information of the periodic CSI is used to indicate that the user equipment reports the frequency domain resources of the periodic CSI, and the scheduling parameters that need to be followed according to some CSIs, such as the MCS.
  • a base station is a semi-persistently scheduled SPS number through a UL Grant.
  • the resource allocation and the like are scheduled, and in the embodiment of the present invention, the CSI scheduling information is sent by using the UL Grant. Therefore, the UL Grant may simultaneously indicate the scheduling information of the CSI and the scheduling information of the SPS data. Indicates scheduling information for the CSI.
  • this step can be configured with three types of UL Grants, as follows:
  • DCI Downlink Control Information
  • the base station needs to configure the SPS C-RNTI scrambled DCI for the periodic CSI.
  • the scheduling of the SPS data service is also configured by the DCI that is scrambled by the SPS C-RNTI, when the RRC signaling is enabled to enable the SPS data service, it is necessary to distinguish between the case where there is no SPS data scheduling. If 1 bit is added directly to the DCI to indicate the presence or absence of data, the overhead of the DCI is increased, and the number of blind detections of the DCI is increased. Therefore, optionally, in this embodiment, the DCI in the following format is used for indication:
  • SPS C-RNTI plus 4 especially DCI's NDI field is set to "0" for new
  • CRC Cyclic Redundancy Check
  • the virtual CRC of the bit may include a 2-bit Transmit Power Control (TPC) command field and a 3-bit Demodulation Reference Signal (DMRS, Demodulation Reference Signal) cyclic shift (CS, Cyclic Shift) ) At least one domain in the domain. You can also select only a few bits in each domain as needed.
  • TPC Transmit Power Control
  • DMRS Demodulation Reference Signal
  • CS Cyclic Shift
  • the modulation order can be predefined, for example: pre-defined as QPSK modulation (modulation order is 2); the current state can also be configured through higher layer signaling.
  • MCS can also select a new domain to indicate MCS, that is, to re-interpret the original domain, for example: You can select the TPC command field, DMRS cyclic shift domain, etc. to indicate MCS. It should be noted that when selected as the MCS field, it cannot be used as a virtual CRC check digit. For example, when the 2-bit TPC field and the 2 bits in the DMRS cyclic shift domain are selected as the indication field of the MCS, only the original 5-bit virtual CRC check bit is left.
  • the bit value of the NDI field of the DCI scrambled by the SPS C-RNTI is "0", and the bit value of each virtual CRC bit is "1".
  • the virtual CRC may include a TPC command field, a DMRS cyclic shift domain, and at least one domain in the MCS and RV domains. As needed, only a few bits in each domain can be selected. For example, only the most significant bits (MSB, Most Significant Bit) are selected as virtual CRC bits in the MCS and RV domains.
  • the user equipment When only the one-bit MCS and the most significant bit of the RV field are selected as the virtual CRC bits in the MCS and RV domains, the user equipment only refers to the four minimums of the MCS and RV domains when interpreting ⁇ cs through the MCS and RV domains.
  • LSB east Significant Bit
  • the current MCS and RV fields are "1 1001”
  • 1 MSB bit is "1”
  • 4 LSBs are "1001”
  • N is an integer greater than or equal to 1 bits
  • the remaining bits can be interpreted first, requiring standard pre-definition, for example, the remaining 1 bit , "0" means QPSK, " ⁇ , means 16QAM, when the user equipment is interpreting through the MCS and RV domains, The current MCS is determined based only on the remaining bits. This method does not require additional DCI bit overhead.
  • the DCI scrambled by the SPS C-RNTI may be a downlink control information format 0 (DCI format 0), or may be a DCI format 4 or other format.
  • DCI format 0 downlink control information format 0
  • DCI format 4 a downlink control information format 4 or other format.
  • the UL Grant of the SPS C-RNTI is as DCI format 4
  • transport Block there are two transport blocks (TB, Transport Block).
  • the NDI domain configuration and the MCS and RV domain configurations corresponding to the two blocks use the above principles.
  • the bit values of the NDI fields of the transport blocks TBI and TB2 of the DCI format 4 are "0".
  • the 3-bit DMRS cyclic shift domain is called DMRS cyclic shift and OCC indication domain.
  • Manner 2 UL Grant configuration period with C-RNTI scrambling CSI semi-persistent scheduling information.
  • the scheduling of the data service is also configured by the C-RNTI scrambled UL Grant, it is necessary to distinguish the case where there is no data transmission, that is, the C-RNTI scrambled UL Grant is only used to configure the semi-persistent scheduling information of the periodic CSI.
  • the UL Grant only indicates semi-persistent scheduling information of the periodic CSI.
  • the UL Grant can be used to distinguish:
  • the UL Grant for C-RNTI scrambling is DCI format 0.
  • the number of PRB is set to 1 ;
  • the UL Grant for C-RNTI scrambling is DCI format 4.
  • One configuration format is that the bit values of the 5-bit MCS and RV fields of TBI and TB2 are
  • this principle can also be used to indicate that the UL Grant is only used to indicate scheduling information of the CSI.
  • the modulation order can be predefined, for example: pre-defined as QPSK modulation (modulation order is 2); the current state can also be configured through higher layer signaling.
  • QPSK modulation modulation order is 2
  • the current state can also be configured through higher layer signaling.
  • MCS You can also choose a new domain to indicate MCS, that is, to re-interpret the original domain.
  • Manner 3 UL Grant configuration period with C-RNTI scrambling CSI semi-persistent scheduling information.
  • the IE, Information element configures a new C-RNTI for use by the periodic CSI.
  • a deactivated UL Grant may also be introduced, that is, when a deactivated UL Grant is received, the user equipment may stop the upper period of the periodic CSI.
  • the bits of the MCS and RV fields may all be set to "1" or "0", and/or the bits of the RB allocation and the Resource Block Assignment And Hopping Resource Allocation.
  • the bits can all be set to "1” or "0”, and/or the bits of the TPC field and the DMRS cyclic shift domain can all be set to " or "0".
  • the base station sends the user equipment to the user equipment by using different UL Grants, as shown in FIG. 4, and there are two types of cycles, and different periods of uplink and downlink times correspond to different UL Grants.
  • the base station may also adopt a dynamic scheduling mechanism, that is, the base station configures a UL Grant for transmitting CSI dynamic scheduling information to the user equipment.
  • a dynamic scheduling mechanism that is, the base station configures a UL Grant for transmitting CSI dynamic scheduling information to the user equipment.
  • Method 1 Using the UL Grant for C-RNTI scrambling for dynamic scheduling, the CSI reporting of each period is scheduled or triggered by a UL Grant. In this case, if the user equipment does not receive the corresponding one at a certain reporting time. UL Grant does not report periodic CSI. It should be noted that the UL Grant for C-RNTI scrambling for dynamic scheduling is to be distinguished from the UL Grant for C-RNTI scrambling for scheduling of data services. The specific distinguishing method may be the method of the second mode (the semi-persistent scheduling information of the CTI scrambled by the C-RNTI).
  • Method 2 Use the UL Grant scrambled by the SPS C-RNTI (not for semi-persistent scheduling, but multiplex the SPS C-RNTI, the attribute is changed to dynamic scheduling), and the CSI reporting of each period is scheduled by a UL Grant. Or triggering. In this case, if the user equipment does not receive the corresponding UL Grant at a certain reporting time, the periodic period CSI is not reported. It should be noted that when the SPS data service is enabled, it is necessary to distinguish between the case where the SPS data service is not sent, that is, the UL Grant of the SPS C-RNTI scrambling is only used to configure the dynamic scheduling information of the periodic CSI.
  • the specific distinguishing method may adopt the method of the first method (the semi-persistent scheduling information of the UL Grant configuration period CSI scrambled by the SPS C-RNTI) in the step 303.
  • Method 3 The UL Grant configuration period scrambled with the new C-RNTI C SI dynamic scheduling information.
  • Step 304 The base station sends semi-persistent scheduling information of the periodic CSI to the user equipment by using the configured UL Grant. Before the user equipment sends the PUSCH to report the periodic CSI, it needs to know the scheduling information that the base station configures for the user equipment. In this embodiment, the base station sends the scheduling information of the periodic CSI to the user equipment by using the UL Grant information.
  • the base station When the base station configures different UL grants for the CSIs with different reporting periods, the base station sends the scheduling information of the CSIs with different reporting periods to the user equipment by using the configured different UL Grants. .
  • the base station At any reporting time, if the user equipment needs to report at least two CSIs with different reporting periods, the base station only needs to configure one UL Grant scheduling information, and the UL Grant is the largest of the multiple different reporting periods. UL Grant corresponding to the reporting period
  • Step 305 The base station receives the CSI reported by the user equipment according to the transmission configuration information and the scheduling information.
  • the base station In the method for transmitting the periodic CSI provided by the embodiment, the base station notifies the user equipment to use the PUSCH to report the periodic CSI, and then configures the frequency domain resource and the MCS of the periodic CSI by the user equipment through the UL Grant, and the frequency domain resource specified by the user equipment according to the UL Grant. And the MCS performs the periodic CSI reporting on the PUSCH. Therefore, the base station can perform flexible configuration of the CSI scheduling information by using the UL Grant, and can select an appropriate frequency domain resource and the MCS for the user equipment according to the channel quality change, thereby performing the frequency domain resource. More efficient use. In addition, the base station optimizes the reporting time of the periodic CSI, further simplifying resource allocation and improving spectrum utilization. Corresponding to the method shown in FIG. 3, as shown in FIG. 6, is a specific embodiment of the CSI transmission method of the present invention. The specific embodiment is described by taking the periodic CSI as an example. It can be understood that The invention is not limited to this. Includes:
  • Step 401 The user equipment receives transmission configuration information of a period C SI that is sent by the base station by using the high layer signaling.
  • the user equipment may determine, according to the transmission configuration information, the reporting of the periodic CSI by using the PUSCH, and the reporting time of the reporting period CSI.
  • the high layer signaling is preferably RRC signaling.
  • the time information includes reporting the downlink component carrier CSI reporting period and N P starting offset within one of said N P N OFFSET, the user equipment according to the received N P and N OFFSET,
  • the periodic CSI reporting time is calculated according to the above formula (1).
  • Step 402 The user equipment receives semi-persistent scheduling information of a periodic CSI sent by the base station to the user equipment by using a UL Grant.
  • the UL Grant may include semi-persistent scheduling information of periodic CSI, or semi-persistent scheduling information of semi-persistent scheduling SPS data, or semi-persistent scheduling information of periodic CSI and semi-persistent scheduling information of semi-persistent scheduling SPS data.
  • the user equipment may determine the frequency domain resource and the MCS of the reporting period CSI according to the semi-persistent scheduling information.
  • the configuration manner of the UL Grant received by the user equipment is as described in the previous embodiment, and details are not described herein again.
  • the base station may also adopt a dynamic scheduling mechanism, that is, the user equipment receives the UL Grant sent by the base station, and according to the dynamic scheduling information sending period CSI, there are three methods:
  • Method 1 Using the UL Grant for C-RNTI scrambling for dynamic scheduling, the CSI reporting of each period is scheduled or triggered by a UL Grant. In this case, if the user equipment does not receive the corresponding one at a certain reporting time. UL Grant does not report periodic CSI. It should be noted that the UL Grant for C-RNTI scrambling for dynamic scheduling is to be distinguished from the UL Grant for C-RNTI scrambling for scheduling of data services.
  • the specific distinguishing method may be the method of the second mode (the semi-persistent scheduling information of the CTI of the UL Grant configuration period scrambled by the C-RNTI) in the step 402.
  • Method 2 UL Grant with SPS C-RNTI scrambling (not for semi-persistent scheduling, only If the SPS C-RNTI is multiplexed, the attribute is changed to dynamic scheduling.
  • the CSI report is sent or triggered by a UL Grant.
  • the user equipment does not receive the corresponding UL Grant at a certain reporting time. , the periodic cycle CSI is not reported.
  • the specific distinguishing method may adopt the method of the first method (the semi-persistent scheduling information of the UL Grant configuration period CSI scrambled by the SPS C-RNTI) in the step 402.
  • Method 3 The UL Grant configuration period scrambled with the new C-RNTI C SI dynamic scheduling information.
  • Step 403 The user equipment reports the period CSI through the PUSCH on the frequency domain resource indicated by the semi-persistent scheduling information at the reporting time indicated by the transmission configuration information.
  • the scheduling information in the UL Grant includes frequency domain resource allocation, that is, allocation of RBs.
  • frequency domain resource allocation that is, allocation of RBs.
  • the base station side performs optimization of the reporting time (described in step 301). For example, as shown in FIG. 5, in this step, three different frequency domain resource sizes need to be allocated, and when the periodic CSI of the group 1 is separately transmitted, the periodic CSI of the group 1 and the group 2 is sent, the group is The cycle CSI of 1 and group 2 and the SPS are the three requirements at the time of transmission.
  • the user equipment can be processed in the following two ways:
  • Manner 1 At any reporting time, if at least two CSIs with different reporting periods need to be reported, the CSI is reported according to the scheduling information of the one UL Grant, where the UL Grant is in the at least two different reporting periods.
  • the domain resource corresponds to all the periodic CSI information data to be transmitted at the time of reporting. Specifically, as shown in Figure 4. As shown, there are two kinds of cycles, and the top and bottom times of different cycles correspond to different UL Grants.
  • the periodic CSIs of the group 1 and the group 2 occur simultaneously, the periodic CSIs of the group 1 and the group 2 are transmitted on the frequency domain resources indicated by the UL Grant corresponding to the group 2 (large period) having the highest priority.
  • the UL Grant is the UL Grant 0 corresponding to the reporting period of the CSI and the largest period in the transmission period of the SPS data service. Specifically, as shown in FIG.
  • the periodic CSIs of Group 1 and Group 2 are sent on the frequency domain resources indicated by the UL Grant corresponding to the high priority group 2 (large period);
  • the periodic CSI and SPS data services of group 1 and group 2 occur simultaneously, the periodic CSI and SPS data of group 1 and group 2 are transmitted on the frequency domain resource indicated by the UL Grant corresponding to the SPS data service (large period) with high priority. business.
  • the frequency domain resource at the time of SPS reporting includes 4 RBs for transmitting periodic CSI and SPS data services of group 1 and group 2; the frequency domain resource at time CSI of group 2 includes 2 RBs.
  • the periodic CSI for transmitting the group 1 and the group 2; the frequency domain resource at the time of reporting the periodic CSI of the group 1 includes 1 RB for transmitting the periodic CSI of the group 1. That is, the SPS data service, the group C1 and the group 2 cycle CSI - only 4 RBs are needed for transmission, saving 1 RB.
  • Manner 2 At any reporting time, if at least two CSIs with different reporting periods need to be reported, the periodic CSI reporting is performed according to the predetermined frequency domain extension rule or the frequency domain resource determined by the frequency domain extension signaling notified by the base station;
  • the CSIs with different reporting periods and the SPS data services are transmitted, and the periodic CSI reporting and the SPS data service transmission are performed according to the frequency domain resources determined by the predetermined frequency domain extension rule or the frequency domain extension signaling notified by the base station.
  • Different groups of periodic C SI information respectively indicate the frequency domain resources required by different UL Grants.
  • frequency domain resource reconfiguration is performed according to a predetermined rule or a high-level signaling notification rule.
  • the MCS change rules when different information is encountered may also be defined in advance or notified by higher layer signaling.
  • the predetermined rule may be: when different information encounters, the spectrum resource is a superposition of frequency domain resources indicated by the UL Grant corresponding to different information; when different information encounters, the spectrum resource is a UL corresponding to the certain information.
  • the frequency domain resource indicated by Grant increases M RBs up or down (M is an integer greater than 1).
  • the high-level signaling can inform which specific pre-defined rules are used, and can also notify the M values in the above rules.
  • the SPS, the periodic CSI of the group 1 and the periodic CSI of the group 2 are respectively configured with three RBs, 1 RB and 1 RB.
  • the SPS is configured according to the SPS.
  • the resource automatically expands down to 2 RBs; when the periodic CSI of group 1 and the periodic CSI of group 2 come into contact, the resources configured according to group 2 are automatically extended downward by 1 RB.
  • the step is preferably configured according to the scheduling information of the UL Grant at this time.
  • the user equipment when the base station uses the dynamic scheduling mechanism to schedule the periodic CSI, the user equipment sends the periodic CSI according to the dynamic scheduling information.
  • the reporting of the periodic CSI is scheduled or triggered by a UL Grant. In this case, if the user equipment does not receive the corresponding UL Grant at a certain reporting time, the periodic CSI is not reported.
  • the user equipment can use the PUSCH in the configuration and scheduling of the base station, and perform periodic CSI reporting according to the frequency domain resource specified by the UL Grant. Therefore, the base station can perform CSI scheduling by using the UL Grant.
  • the embodiment of the present invention further provides a base station, as shown in FIG. 7, including:
  • the sending unit 10 is configured to send the transmission configuration information of the channel state information CSI to the user equipment, where the transmission configuration information includes the transmission mode information and the reporting time information, where the transmission mode information is used to indicate that the user equipment is uplink shared by the physical layer.
  • the channel PUSCH reports the CSI, and the reporting time information is used to indicate the time when the user equipment reports the CSI; and the CSI scheduling information is sent to the user equipment by using the uplink grant information UL Grant;
  • the first receiving unit 11 is configured to receive the CSI reported by the user equipment according to the transmission configuration information and the scheduling information sent by the sending unit 10.
  • the base station provided by the embodiment of the present invention can notify the user equipment to use the PUSCH to report the CSI in advance, and then notify the user equipment to report the frequency domain resource and the MCS of the CSI through the UL Grant, so that the user equipment performs the frequency domain resource and the MCS specified by the UL Grant.
  • the CSI is reported, and therefore, the flexible allocation of CSI scheduling information can be performed by using the UL Grant.
  • the sending unit 10 is specifically configured to send the CSI transmission configuration information to the user equipment by using the high layer signaling, where the high layer signaling is preferably the radio resource control RRC signaling.
  • the base station further includes a configuration unit 12, configured to configure the UL Grant for the sending unit 10, where the configured UL Grant is SPS.
  • the C-RNTI scrambled DCI, the configured SPS C-RNTI scrambled DCI does not contain scheduling information of the data, and satisfies one of the following two configurations:
  • the first configuration includes: the SPS C-RNTI scrambled DCI new data indicates that the bit value of the NDI field is “0”, and the bit values of the MCS and RV domains are “1 1101” or “11 110” or “111 11”;
  • the second configuration includes: the bit value of the NDI field of the DCI scrambled by the SP S C-RNTI
  • the UL Grant configured by the configuration unit 12 is a C-RNTI scrambled DCI, and the configured SPS C-RNTI scrambled DCI does not include scheduling information of the data, and satisfies the following One of three configurations:
  • the third configuration includes: the bit value of the MCS and RV domains of the DCI scrambled by the C-RNTI is "00000", and the number of physical resource blocks PRB is an integer greater than one;
  • the fourth configuration includes: the bit value of the MCS and RV domains of the DCI scrambled by the C-RNTI is "11100", and the number of PRBs is 1;
  • the fifth configuration includes: the bit values of the MCS and RV domains are "1 1110” or “11 111", and the bit value of the CQI request field is "1";
  • the sending unit 10 sends the scheduling information of the CSI to the user equipment, which is specifically used by the UL Grant configured by the configuration unit 12.
  • the configuration unit 12 is further configured to configure different UL Grants for CSIs with different reporting periods. Then, the sending unit 10 sends the different UL Grants configured by the configuration unit 12 to the user equipment respectively. Scheduling information of CSI for different reporting periods.
  • the base station provided in this embodiment of the present invention can be applied to multiple downlink cell carrier aggregation scenarios.
  • a CA system there are multiple downlink component carriers.
  • downlink component carriers in one CA system may be grouped, and downlink component carriers may be divided into at least one group.
  • the CSI is specifically a CSI of a downlink component carrier, and, further, As shown in FIG.
  • the base station of the embodiment of the present invention further includes a determining unit 13 configured to determine a CSI reporting time information of the downlink component carrier, where the reporting time information includes a CSI reporting period of the downlink component carrier, and a starting offset in the reporting period, such that: in the reporting time information of the CSI of the downlink UE of the same group, the reporting period value and the starting offset value are the same, and different groups of downlink component carriers In the reporting time information of the CSI, the reporting period value is different, the starting offset value is the same, and the small reporting period value is a factor of a large reporting period value.
  • the determining unit 13 is further configured to determine, according to the transmission period of the SPS data service, and the reporting period of the CSI of each group of downlink component carriers, the CSI reporting time information of the downlink component carrier, where
  • the reporting time information includes a reporting period of the CSI of the downlink unit carrier and a starting offset of the reporting period to enable payment:
  • the transmission period of the SPS data service is the same as the reporting period of the CSI of the at least one downlink component carrier, the reporting time of the CSI of the at least one downlink component carrier, the reporting period, and the SPS data service
  • the transmission period is the same, and the initial offset is the same as the initial offset of the SPS data service in one transmission period;
  • the initial offset value and the SPS in the CSI reporting time information of the at least one downlink component carrier when the transmission period of the SPS data service is greater than the reporting period of the CSI of the at least one downlink component carrier The data service has the same starting offset value in one transmission period, and the reporting period value is a factor of the transmission period value of the SPS data service;
  • the initial offset value and the SPS in the CSI reporting time information of the at least one downlink component carrier when the transmission period of the SPS data service is smaller than the reporting period of the CSI of the at least one downlink component carrier The data service has the same starting offset value in one transmission period, and the reporting period value is a multiple of the transmission period value of the SPS data service.
  • the sending unit 10 specifically transmits the transmission configuration information of the CSI to the user equipment,
  • the transmission configuration information includes transmission mode information and reporting time information determined by the determining unit 13.
  • the embodiment of the present invention further provides a user equipment, as shown in FIG. 10, including:
  • the second receiving unit 20 is configured to receive the transmission configuration information of the CSI sent by the base station, where the transmission configuration information includes the transmission mode information and the reporting time information, where the transmission mode information is used to indicate that the user equipment uses the physical layer to uplink the shared channel.
  • the PUSCH reports the CSI, where the reporting time information is used to indicate the time when the user equipment reports the CSI, and receives the scheduling information of the CSI sent by the base station to the user equipment by using the UL Grant;
  • the reporting unit 21 is configured to report the CSI to the base station by using the PUSCH according to the transmission configuration information and the scheduling information received by the second receiving unit 20.
  • the user equipment provided by the embodiment of the present invention can use the PUSCH in the configuration and scheduling of the base station, and perform CSI reporting according to the frequency domain resource specified by the UL Grant. Therefore, the base station can flexibly configure the CSI scheduling information by using the UL Grant. The user equipment is able to transmit CSI on the preferred channel for which the base station is configured, which enables frequency domain resource utilization to be more efficient.
  • the ability to transmit CSI on a preferred channel can make frequency domain resource utilization more efficient.
  • the UL Grant received by the second receiving unit 20 may be specifically a DCI scrambled by the SPS C-RNTI, and the DCI scrambled by the SPS C-RNTI does not include scheduling information of the data, and satisfies one of the following two configurations. :
  • the first configuration includes: the new data of the DCI scrambled by the SPS C-RNTI indicates that the bit value of the NDI field is "0", and the bit values of the MCS and RV domains are "11 101" or "111 10" or "1111 1
  • the second configuration includes: the bit value of the NDI field of the DCI scrambled by the SP S C-RNTI is "0", and the bit value of each virtual CRC bit is "1".
  • the UL Grant received by the second receiving unit 20 may also be specifically C-RNTI scrambled
  • the DCI scrambled by the C-RNTI does not include scheduling information of the data, and satisfies the following three types.
  • the third configuration includes: the bit value of the MCS and RV domains of the DCI scrambled by the C-RNTI is "00000", and the number of physical resource blocks PRB is an integer greater than one;
  • the fourth configuration includes: the bit value of the MCS and RV domains of the DCI scrambled by the C-RNTI is "11100", and the number of PRBs is 1;
  • the fifth configuration includes: the bit values of the MCS and RV fields are “1 1110” or “11 111”, and the bit value of the CQI request field is "1".
  • the reporting unit 21 is specifically configured to:
  • the CSI is reported only according to the scheduling information of the one type of the UL Grant received by the second receiving unit 20, where the UL Grant is the at least two UL Grant corresponding to the largest reporting period in different reporting periods;
  • the CSI reporting and the SPS data service are transmitted according to only one UL Grant scheduling information received by the second receiving unit 20,
  • the UL Grant is a UL Grant corresponding to a reporting period of the CSI and a maximum period of a transmission period of the SPS data service.
  • reporting unit 21 is further configured to report the CSI according to the scheduling information of the UL Grant for dynamic scheduling when the UL Grant for C-RNTI scrambling for dynamic scheduling is monitored. .

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Abstract

Des modes de réalisation de la présente invention portent sur un procédé et un dispositif de transmission de CSI, se rapportant au domaine des technologies de la communication, de façon à utiliser efficacement des ressources du domaine fréquentiel. Le procédé de transmission de CSI comprend les opérations suivantes : un nœud B évolué envoie à un équipement utilisateur des informations de configuration de transmission d'informations d'état de canal (CSI), les informations de configuration de transmission comprenant des informations de mode de transmission et des informations de moment de rapport, les informations de mode de transmission étant utilisées pour indiquer à l'équipement utilisateur de rapporter les CSI par un canal partagé de liaison montante physique (PUSCH), et les informations de moment de rapport étant utilisées pour indiquer à l'équipement utilisateur un moment pour rapporter les CSI ; le nœud B évolué envoie à l'équipement utilisateur des informations de planification des CSI par l'intermédiaire d'informations d'autorisation de liaison montante (UL Grant) ; et le nœud B évolué reçoit les CSI rapportées, conformément aux informations de configuration de transmission et aux informations de planification, par l'équipement utilisateur. La présente invention est applicable à des systèmes de radiocommunication.
PCT/CN2012/070194 2011-01-10 2012-01-10 Procédé et dispositif de transmission de csi Ceased WO2012094990A1 (fr)

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