CN102595596A

CN102595596A - CSI transmission method and apparatuses

Info

Publication number: CN102595596A
Application number: CN2011100037888A
Authority: CN
Inventors: 李超君; 吕永霞; 范霄安
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2011-01-10
Filing date: 2011-01-10
Publication date: 2012-07-18
Anticipated expiration: 2031-01-10
Also published as: CN102595596B; WO2012094990A1

Abstract

The embodiment of the invention, which relates to the communication technology field, provides a channel state information (CSI) transmission method and apparatuses, so that resources in a frequency domain can be effectively utilized. The CSI transmission method comprises: a base station sends transmission configuration information of CSI to user equipment, wherein the transmission configuration information includes transmission mode information that is used for indicating user equipment to report the CSI through a physical uplink shared channel (PUSCH) and report time information that is used for indicating the time for reporting the CSI by the user equipment; the base station sends CSI scheduling information to the user equipment by uplink grant (UL Grant) information; and the base station receives the CSI that is reported by the user equipment based on the transmission configuration information and the scheduling information. According to the invention, the CSI transmission method and the apparatuses can be applied to a wireless communication system.

Description

CSI transmission method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a CSI transmission method and apparatus.

Background

In an lte (long Term evolution) system, in order to support downlink adaptive scheduling, a UE needs to report channel state information csi (channelistate information) of a downlink carrier to a base station. The CSI includes a channel quality Indicator cqi (channel quality Indicator), a precoding Matrix Indicator pmi (precoding Matrix Indicator), a Rank Indicator (RI, Rank Indicator), and the like. The Reporting of the CSI comprises periodic CSI Reporting (periodic CSI Reporting) and Aperiodic CSI Reporting (Aperiodic Reporting), wherein when no Uplink data are sent, the periodic CSI is sent through a Physical Uplink Control Channel (PUCCH), and when the Uplink data are sent, the periodic CSI is sent through a Physical Uplink Shared Channel (PUSCH); the aperiodic CSI is transmitted over the PUSCH.

In order to increase the peak rate and meet the requirement of future communication systems for data rate, the enhanced long Term Evolution LTE-a (long Term Evolution advanced) system introduces a carrier aggregation ca (carrier aggregation) technology, i.e. a plurality of cell carriers cc (component carrier) can be received or transmitted simultaneously. For example, LTE-a Release10 (Rel-10, Release10) already supports a maximum of 5 downlink carrier aggregations, possibly expanding further in the future. In order to support adaptive scheduling of each downlink component carrier, CSI of each downlink component carrier needs to be fed back. In addition, most scenarios of a time Division multiplexing TDD (time Division dual) system are that downlink subframes are more than uplink subframes, so that in a carrier aggregation scenario, especially in the carrier aggregation scenario of TDD, the number of CSI information bits that need to be fed back each time is greatly increased compared to LTE, and one PUCCH in the LTE system can only carry 11-bit periodic CSI at most, which is difficult to meet the requirement, so that the periodic CSI needs to be configured on PUSCH for transmission, thereby ensuring transmission accuracy. Thus, how to schedule the transmission of periodic CSI on PUSCH is a problem to be solved. However, the method for configuring through high-level signaling proposed in the prior art belongs to semi-static configuration, and cannot flexibly configure scheduling information of periodic CSI.

Disclosure of Invention

The main purpose of the embodiments of the present invention is to provide a CSI transmission method and apparatus, which can flexibly configure scheduling information of CSI.

In one aspect, an embodiment of the present invention provides a CSI transmission method, including:

the method comprises the steps that a base station sends transmission configuration information of Channel State Information (CSI) to user equipment, wherein the transmission configuration information comprises transmission mode information and reporting time information, the transmission mode information is used for indicating the user equipment to report the CSI through a physical layer uplink shared channel (PUSCH), and the reporting time information is used for indicating the time when the user equipment reports the CSI;

the base station sends CSI scheduling information to the user equipment through Uplink Grant (UL Grant);

and the base station receives CSI reported by the user equipment according to the transmission configuration information and the scheduling information.

In another aspect, an embodiment of the present invention provides a CSI transmission method, including:

the method comprises the steps that user equipment receives transmission configuration information of CSI sent by a base station, wherein the transmission configuration information comprises transmission mode information and reporting time information, the transmission mode information is used for indicating the user equipment to report the CSI through a physical layer uplink shared channel (PUSCH), and the reporting time information is used for indicating the time when the user equipment reports the CSI;

the user equipment receives scheduling information of CSI sent to the user equipment by the base station through the UL Grant;

and the user equipment reports CSI to the base station through a PUSCH according to the transmission configuration information and the scheduling information.

In another aspect, an embodiment of the present invention provides a base station, including:

the sending unit is used for sending transmission configuration information of Channel State Information (CSI) to user equipment, wherein the transmission configuration information comprises transmission mode information and reporting time information, the transmission mode information is used for indicating the user equipment to report the CSI through a physical layer uplink shared channel (PUSCH), and the reporting time information is used for indicating the time when the user equipment reports the CSI; sending CSI scheduling information to the user equipment through an uplink Grant (UL Grant);

and a first receiving unit, configured to receive CSI reported by the user equipment according to the transmission configuration information and the scheduling information sent by the sending unit.

In another aspect, an embodiment of the present invention provides a user equipment, including:

a second receiving unit, configured to receive transmission configuration information of 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 instruct a user equipment to report the CSI through a physical layer uplink shared channel PUSCH, and the reporting time information is used to instruct the user equipment to report the CSI at a time; receiving scheduling information of CSI (channel state information) sent to the user equipment by the base station through the UL Grant;

and a reporting unit, configured to report CSI to the base station through a PUSCH according to the transmission configuration information and the scheduling information received by the second receiving unit.

After the technical scheme is adopted, according to the CSI transmission method, the base station and the user equipment provided by the embodiment of the invention, the base station informs the user equipment of reporting the CSI by using the PUSCH in advance, and then sends the scheduling information of the CSI through the UL Grant, so that the user equipment reports the CSI according to the scheduling information specified by the UL Grant, and therefore, the base station can flexibly configure the CSI scheduling information through the UL Grant.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flowchart of a CSI transmission method according to an embodiment of the present invention;

fig. 2 is a flowchart of a CSI transmission method according to an embodiment of the present invention;

fig. 3 is another flowchart of a CSI transmission method according to an embodiment of the present invention;

fig. 4 is an exemplary diagram of the reporting 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 CSI transmission method according to an embodiment of the present invention;

fig. 7 is a block diagram of a base station according to an embodiment of the present invention;

fig. 8 is a block diagram of another structure of a base station according to an embodiment of the present invention;

fig. 9 is a block diagram of another structure of a base station according to an embodiment of the present invention;

fig. 10 is a block diagram of a user equipment according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, in the embodiment of the present invention, the CSI may feed back at least one of the following information: RI, wideband PMI, wideband CQI and subband CQI. In addition, the Cell carrier in the present invention may also be replaced by the concept of a Cell (Cell), such that the Primary Cell carrier is also referred to as a Primary Cell (PCell) and the Secondary Cell carrier is also referred to as a Secondary Cell (SCell).

As shown in fig. 1, a method for transmitting CSI provided in an embodiment of the present invention is based on a base station, and includes:

step 101, a base station sends CSI transmission configuration information to user equipment.

The transmission configuration information comprises transmission mode information and reporting time information, the transmission mode information is used for indicating user equipment to report CSI through a physical layer uplink shared channel (PUSCH), and the reporting time information is used for indicating the time when the user equipment reports the CSI.

And 102, the base station sends the scheduling information of the CSI to the user equipment through the uplink Grant information (UL Grant).

The CSI scheduling information is used to indicate the frequency domain resource for reporting the CSI by the ue, and some relevant scheduling parameters that need to be followed when reporting the CSI, such as modulation and Coding scheme (mcs).

And 103, the base station receives the CSI reported by the user equipment according to the transmission configuration information and the scheduling information.

In the CSI transmission method provided in the embodiment of the present invention, the base station notifies the user equipment to report the CSI using the PUSCH in advance, and then sends the scheduling information of the CSI through the UL Grant, so that the user equipment reports the CSI according to the scheduling information specified by the UL Grant. Moreover, the base station can select proper frequency domain resources and MCS for the user equipment according to the channel quality change condition, and the frequency domain resources can be more effectively utilized.

Corresponding to the method shown in fig. 1, as shown in fig. 2, a CSI transmission method provided in an embodiment of the present invention is based on the user equipment served by the base station, and includes:

step 201, the ue receives the transmission configuration information of the CSI sent by the base station.

The transmission configuration information comprises transmission mode information and reporting time information, wherein the transmission mode information is used for indicating user equipment to report CSI through a physical layer uplink shared channel (PUSCH), and the reporting time information is used for indicating the time when the user equipment reports the CSI;

step 202, the ue receives scheduling information of CSI sent by the base station to the ue through the UL Grant.

And step 203, the user equipment reports the CSI to the base station through the PUSCH according to the transmission configuration information and the scheduling information.

Specifically, the ue reports the CSI to the base station through the PUSCH at the reporting time indicated by the transmission configuration information and on the frequency domain resource indicated by the scheduling information.

According to the CSI transmission method provided by the embodiment of the invention, the user equipment can use the PUSCH under the configuration and scheduling of the base station and report the CSI according to the frequency domain resource specified by the UL Grant, so that the base station can flexibly configure the CSI scheduling information through the UL Grant. The user equipment can send the CSI on the preferred channel configured for it by the base station, which can make the frequency domain resource utilization more efficient.

The following describes the CSI transmission method according to the present invention by using a specific embodiment, where the following specific embodiment takes periodic CSI as an example, it is to be understood that the present invention is not limited thereto.

Fig. 3 shows a specific embodiment of the CSI transmission method according to the present invention. The present embodiment is applied to a scenario in which multiple downlink element carriers are aggregated, and may also be applied to other scenarios, where the CSI is specifically CSI of a downlink element carrier. In order to more effectively utilize the frequency domain resources, in this embodiment, the downlink unit carriers in one CA system are grouped, and the downlink unit carriers are grouped into at least one group, and a specific grouping manner may be that the base station configures through a high layer signaling, or may be predefined. For example, the downlink unit carriers may be grouped according to frequency bands (bands), such as: when the downlink unit carriers of band 3 and band 7 are subjected to carrier aggregation, all the downlink unit carriers of band 3 are in one group, and all the downlink unit carriers of band 7 are in one group; grouping can also be performed according to the carrier type of the downlink unit carrier, for example: the Primary cell Carrier PCC (Primary Component Carrier) and the secondary cell Carrier scc (secondary Component Carrier) are divided into different groups. It should be noted that, preferably, the fewer the packets, the simpler and more effective the scheduling of the base station, i.e. the simpler and more effective the scheduling of the reporting time and the resource allocation.

As shown in fig. 3, the present embodiment includes:

step 301, the base station determines the reporting time information of the periodic CSI of the downlink cell carrier.

Specifically, the reporting time information includes a reporting period N of CSI of the downlink cell carrier_PAnd one of said N_PInitial offset N of_OFFSETThe user equipment will be based on the received N_PAnd N_OFFSETCalculating to obtain the periodic CSI reporting time according to the formula (1), wherein the time meeting the formula (1) is the periodic CSIAnd reporting the time.

Wherein n is_fIs the System frame number, n_sIs the Slot number (Slot number) within a radio frame.

Preferably, the determined reporting time information enables the reporting times of the periodic CSI of the carriers of the downlink units to be collided maximally, that is, reported simultaneously as much as possible, so as to utilize the frequency domain resources more effectively.

Specifically, in the reporting time information of the CSI of the downlink unit carriers of the same group determined by the base station, N is_PValue and N_OFFSETThe values are the same, and N is the reporting time information of the CSI of the downlink unit carriers of different groups determined by the base station_PDifferent value, N_OFFSETThe same value, and small N_PValue of large N_PFactor of value, i.e. small N_PN whose value must be able to be large_PThe value is divided evenly.

For example, as shown in fig. 4, there are two sets of downlink cell carriers, group 1 and group 2, each cell representing 1 millisecond (ms), and N for group 1 and group 2_OFFSETSame, N of periodic CSI of group 1_PN of periodic CSI for group 2 of 5ms_PN of periodic CSI for group 1 of 10ms_PIs N for periodic CSI for group 2_PSo that the reporting times for group 1 and group 2 will be maximized in collisions as shown in fig. 4.

It should be noted that the standard may define only N_PRelation of values, N_OFFSETThe value is realized by the base station through an algorithm, and the principle of the algorithm is to make the reporting time of the periodic CSI of each downlink unit carrier collide with each other maximally, namely reporting at the same time as much as possible.

In the effective reporting period of the periodic CSI, when there is a Semi-Persistent Scheduling (SPS) data service, in this step, the base station determines that the reporting time information of the periodic CSI of the downlink cell carrier specifically is:

determining reporting time information of the CSI of the downlink unit carrier according to the transmission period of the SPS data service and the reporting period of the CSI of each group of downlink unit carriers, wherein the reporting time information comprises N of the CSI of the downlink unit carriers_PAnd one of said N_PInner N_OFFSET。

Preferably, the determined reporting time information enables the reporting time of the periodic CSI of each downlink cell carrier and the reporting time of the service data of the SPS data service to be collided maximally, that is, reported simultaneously as much as possible, so as to utilize the frequency domain resources more effectively.

Specifically, the transmission period of the SPS data service and N of CSI of at least one group of downlink element carriers_PWhen the same, in the reporting time information of the CSI of the at least one group of downlink unit carriers determined by the base station, N is_PValue is same as transmission period value of the SPS data service, N_OFFSETThe value is the same as the starting offset value of the SPS data service in one transmission period;

the transmission period of the SPS data service is greater than N of CSI of at least one group of downlink unit carriers_PIn the reporting time information of the CSI of the at least one group of downlink unit carriers determined by the base station, N_OFFSETThe value is the same as the starting offset value of the SPS data service in one transmission period, N_PA factor having a value of a transmission period value of the SPS data traffic;

the transmission period of the SPS data service is less than N of CSI of at least one group of downlink unit carriers_PIn the reporting time information of the CSI of the at least one group of downlink unit carriers determined by the base station, N_OFFSETThe value is the same as the starting offset value of the SPS data service in one transmission period, N_PA value is a multiple of a transmission period value of the SPS data traffic.

For example, as shown in fig. 5, there are two sets of downlink component carriers, set 1 and set 2, and N of the periodic CSI of set 1_PN of periodic CSI for group 2 of 5ms_P10ms, the transmission period of the SPS data service is 20ms, N of the periodic CSI of group 1_PIs N for periodic CSI for group 2_PFactor of (1), N of the periodic CSI of group 1 and group 2_PIs a factor of the transmission period of the SPS data service, and therefore, the transmission time of the SPS data service, and the reporting times of the periodic CSI of the group 1 and the group 2 will be collided maximally.

In addition, it should be noted that when the transmission period of the service data of the SPS data service is fine-tuned, for example, for some uplink and downlink Subframe configurations of the TDD system, Subframe Offset (Subframe Offset) may be configured to be "0" or some specific value, and when configured to be other values, the period may be fine-tuned, for example, the transmission time is: 0, 9, 20, 29, 30., the reporting time of the periodic CSI of each set of downlink cell carriers determined by the base station needs to be finely adjusted according to the service data transmission period of the SPS data service.

It should be noted that the standard may define only N_PRelation of values, N_OFFSETThe value is realized by a base station through an algorithm, and the principle of the algorithm is that the reporting time of the periodic CSI of each downlink unit carrier and the transmission time of the service data of the SPS data service are collided to the maximum extent.

The method for determining the reporting time information of the periodic CSI of the downlink unit carrier by the base station can enable resource allocation to be more effective and enable the frequency spectrum utilization rate to be higher. For example, as shown in fig. 5, it is assumed that each of the resource blocks RB (resource block) needs 0.5 when the periodic CSI of group 1 and group 2 is independently reported, and since the frequency domain resources are allocated in units of RBs, an integral number of RBs will be allocated when the integral number of RBs is not needed for information transmission, that is, if each of the periodic CSI of group 1 and group 2 needs 1RB when the periodic CSI of group 1 is independently reported, 2 RBs are needed when the SPS data traffic data is reported, that is, 4 RBs are needed in total; in the embodiment of the invention, because the reporting/transmission time corresponding to the group 1, the group 2 and the SPS data service has the maximum collision corresponding relation, the periodic CSI of the group 1 and the group 2 and the SPS data service can have the reporting/transmission time together, and at this time, only 3RB is needed, so that the spectrum utilization rate is improved. Moreover, the method for determining the reporting time information of the periodic CSI of the downlink unit carrier by the base station can also reduce the reporting/transmission time, thereby being beneficial to saving the electricity of the user equipment. In addition, when various semi-persistent scheduling packets corresponding to service data of periodic CSI and/or SPS data services and the like need to be reported/transmitted, if the reporting/transmission time is not planned, sometimes the packets are transmitted together in a collision manner, sometimes the packets are separately transmitted, scheduling becomes very complicated, and particularly resource allocation can be effectively simplified by the above manner.

It should be noted that, when there are various semi-persistent schedules in other scenarios, the above-mentioned method for determining the reporting time information of the periodic CSI of the downlink cell carrier by the base station may also be adopted. For example, in a heterogeneous network (heterogeneous network) scenario.

Step 302, the base station sends transmission configuration information of periodic CSI to the user equipment through a high-level signaling.

The transmission configuration information includes transmission mode information and reporting time information, where the transmission mode information is used to instruct the user equipment to report the periodic CSI by using the physical layer uplink shared channel PUSCH, and the reporting time information is the reporting time information determined in step 301 and is used to instruct the time at which the user equipment reports the periodic CSI, that is, to instruct the user equipment which time the periodic CSI needs to be reported.

Preferably, in this step, the base station sends the transmission configuration information of the periodic CSI to the user equipment through a high-level radio resource control rrc (radio resource control) signaling, and of course, the base station may also send the transmission configuration information of the periodic CSI through other high-level signaling, which is not limited in this invention.

When a base station sends transmission mode information through a high-level signaling, a bit field can be added in the high-level signaling, and the bit field is utilized to indicate user equipment to report periodic CSI through a PUSCH; or, a specific transmission mode identifier may be carried in the higher layer signaling, where the specific transmission mode identifier is used to indicate that the ue reports periodic CSI via PUSCH.

Specifically, in this step, the reporting time information includes a reporting period N_PAnd a starting offset N in a reporting period_OFFSETAnd the user equipment can determine the reporting time of the periodic CSI according to the parameters.

It should be noted that, in the CA system, a plurality of downlink cell carriers are included, in this embodiment, optionally, transmission configuration information of periodic CSI of different downlink cell carriers is configured independently, that is, transmission mode information and reporting time information of periodic CSI of each downlink cell carrier need to be configured independently. In addition, the transmission configuration information of the periodic CSI for a set of downlink component carriers may be configured together.

Step 303, the base station configures the ULGrant for transmitting the scheduling information of the CSI to the user equipment.

With the UL Grant, scheduling information can be flexibly configured, for example: and the most suitable frequency domain resource can be selected to report the CSI at the right moment according to the change of the wireless channel.

In uplink, the user equipment may transmit data, may also transmit CSI, or may transmit data and CSI together on the PUSCH. In this step, 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, the UL Grant needs to be further designed, which is specifically as follows. Note that the data described in the present invention refers to a Transport packet (Transport Block) carried on an Uplink Shared Channel (UL-SCH), and may be dynamically scheduled (referred to as dynamic data in the present invention) or semi-persistently scheduled (referred to as semi-persistently scheduled data in the present invention). Among them, the UL-SCH belongs to one of transport channels (transport channels), i.e., an information transfer service provided from a physical layer to a MAC (multimedia access control).

In this embodiment, a semi-persistent scheduling mechanism is adopted, and the scheduling information of the periodic CSI configured by the base station to the user equipment is semi-persistent scheduling information, which means scheduling information (e.g., frequency domain resource allocation, MCS, and the like) indicated by one UL Grant effectively lasts for a period of time at the periodic CSI reporting time until a new UL Grant appears, and then the scheduling information periodically effectively lasts for a period of time until the new UL Grant appears again. In this step, the base station can configure appropriate frequency domain resources and MCS for the user equipment according to the channel quality change condition, and thus, the frequency domain resources can be more effectively utilized.

Wherein 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 both periodic CSI and semi-persistent scheduling SPS data. The semi-persistent scheduling information of the periodic CSI is used to indicate frequency domain resources of the periodic CSI reported by the ue, and some scheduling parameters that need to be followed by the MCS and the like when reporting the periodic CSI.

For example, as is well known, the base station performs resource allocation and other scheduling on the SPS data service through the UL Grant, and in the embodiment of the present invention, the scheduling information of the CSI is sent through the UL Grant, so that the UL Grant may indicate the scheduling information of the CSI and the scheduling information of the SPS data at the same time, and of course, may also indicate only the scheduling information of the CSI.

Specifically, the step may configure three ways of UL Grant as follows:

the first method is as follows: the semi-persistent scheduling information of the periodic CSI is configured by downlink control information dci (downlink control information) scrambled by SPS C-RNTI (SPS Cell Radio Network temporary identifiers).

When the semi-persistent scheduling information of the periodic CSI is configured by using the DCI scrambled by the SPS C-RNTI, the base station needs to configure the DCI scrambled by the SPS C-RNTI for the periodic CSI even if no SPS data service is configured. In addition, since the scheduling of the SPS data service is also configured through the DCI scrambled by the SPSC-RNTI, it is necessary to distinguish the case without SPS data scheduling after the RRC signaling turns on the SPS data service. If 1 bit is directly added to the DCI to indicate whether data exists, 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 with the following format is used for indication:

one configuration format is that the new data of the SPS C-RNTI scrambled DCI indicates that the NDI field has a bit value of "0" and the MCS and Redundancy Version (RV) fields have a bit value of "11101" (i.e., I_MCS29) or "11110" (i.e. I)_MCS30) or "11111" (i.e., I)_MCS31). NDI field of DCI scrambled by SPS C-RNTI is set to '0' to indicate new/initial transmission, I_MCS29/30/31 indicates different RV versions for retransmissions, and NDI takes the value "0" indicates that the initial transmission is contradictory, so these states are redundant in existing systems. The redundant state is used for indication, and no extra bit information overhead is required to be added. In order to reduce the false alarm probability of Cyclic Redundancy Check (CRC), the MCS and RV fields with 5 bits can be set as unique fixed values, for example, only taking the value of "11101" (i.e. I)_MCS＝29)。

To further reduce the CRC false alarm probability, a virtual Cyclic Redundancy Check (CRC) bit may be set, with the bit value of each virtual CRC bit being set to "1". Here, preferably, the virtual CRC of bits may include at least one of a Transmit Power Control (TPC) command field of 2 bits and a Demodulation Reference Signal (DMRS) Cyclic Shift (CS) field of 3 bits. Only a few bits in each field may be selected as desired.

Considering that the MCS and RV fields have been fixedly set, and lose the role of indicating the current MCS, a modulation order may be predefined, for example: the modulation order is pre-defined as QPSK modulation (modulation order is 2); the current MCS may also be configured by higher layer signaling; a new field may also be selected to indicate MCS, i.e. reinterpretation of the original field, for example: the TPC command field, DMRS cyclic shift field, etc. may be selected to indicate the MCS. It should be noted that, when selected as the indicated MCS field, it cannot be used as the virtual CRC check bit. For example, when 2 bits in the TPC field and DMRS cyclic shift field of 2 bits are selected as the MCS indication field, only 1 bit remains in the original 5-bit virtual CRC check bit.

Another configuration format is that the bit value of the NDI field of the SPS C-RNTI scrambled DCI is "0", and the bit value of each virtual CRC bit is "1". Preferably, the virtual CRC may include a TPC command field, a DMRS cyclic shift field, and at least one of an MCS and an RV field. Only a few bits in each domain may be selected as needed, for example, only the Most Significant Bit (MSB) in the MCS and RV domains is selected as the virtual CRC Bit. When only the most significant bit of the MCS and RV domain with 1 bit is selected as the virtual CRC bit in the MCS and RV domain, the user equipment decodes I through the MCS and RV domain_MCSWhen the current MCS and RV field is "11001", 1 MSB Bit is "1", and 4 LSB bits are "1001", for example, only 4 Least Significant Bits (LSB) of the MCS and RV field are referred to, so the ue interprets the current I_MCS9. When the most significant bit of N (N is an integer greater than or equal to 1) bits is selected as the virtual CRC bit in the MCS and RV domains, the remaining bits can be explained again, standard predefinition is required, for example, 1 bit remains, "0" represents QPSK, "1" represents 16QAM, and the user equipment decodes I through the MCS and RV domains_MCSAnd judging the current MCS only according to the residual bit. The method does not need to increase the additional DCI bit overhead.

Specifically, the DCI scrambled by the SPS C-RNTI may be downlink control information format 0(DCIformat 0), may also be DCI format 4, or other formats. When the UL Grant scrambled by the SPS C-RNTI is DCI format 4 and there are two Transport Blocks (TBs), the NDI field configuration and MCS and RV field configuration corresponding to the two TB blocks both adopt the above principle, for example, the bit value of the NDI field of the transport block TB1 and TB2 of the SPS format 4 is "0". In DCI format 4, a 3-bit DMRS cyclic shift field is referred to as a DMRS cyclic shift and OCC indication field.

The second method comprises the following steps: and configuring semi-persistent scheduling information of the periodic CSI by using the UL Grant scrambled by the C-RNTI.

Since the scheduling of the data traffic is also configured by the C-RNTI scrambled UL Grant, which indicates only the semi-persistent scheduling information of the periodic CSI, it is necessary to distinguish a case where no data is transmitted, i.e., the C-RNTI scrambled UL Grant is used only to configure the semi-persistent scheduling information of the periodic CSI.

In this way, optionally, the UL Grant with the following format may be used for distinguishing:

1. and the UL Grant scrambled by the C-RNTI is DCI format 0.

One configuration format is that the bit values of the MCS and RV fields are "00000" (i.e., I)_MCS0), and the number of Physical Resource Blocks (PRB) is an integer greater than 1;

another configuration format is that the bit value of the 5-bit MCS and RV fields is "11100" (i.e., I)_MCS28), the number of PRBs is set to 1;

yet another configuration format is that the bit value of the 5-bit MCS and RV fields is "11110" (i.e., I_MCS30) or "11111" (i.e., I)_MCS31), the CQI request field is set to 1. The bit value of the MCS and RV domain is preferably "11110" (i.e., I) here_MCS30) because RV version is 2 (I)_MCS30) with a usage rate of 3 (I) than RV version_MCS31) low.

2. And the UL Grant scrambled by the C-RNTI is DCI format 4.

One configuration format is that the 5-bit MCS and RV fields of TB1 and TB2 have a bit value of "00000" (i.e., I)_MCS0), the number of PRBs is set to an integer greater than 1;

the other configuration format is that the bit values of 5-bit MCS and RV fields of TB1 and TB2 are"11100" (i.e. I)_MCS28), the number of PRBs is set to 1;

yet another configuration format is that the bit values of the 5-bit MCS and RV fields of TB1 and TB2 are "11110" (i.e., I)_MCS30) or "11111" (i.e., I)_MCS31), the CQI request field is set to 1. The bit value of the MCS and RV domain is preferably "11110" (i.e., I) here_MCS＝30)。

It should be noted that, in addition to the existing formats 0 and 4, when a new Format is introduced later, this principle may also be adopted to indicate that the UL Grant is only used for indicating the scheduling information of the CSI.

Considering that the MCS and RV fields have been fixedly set, and lose the role of indicating the current MCS, a modulation order may be predefined, for example: the modulation order is pre-defined as QPSK modulation (modulation order is 2); the current MCS may also be configured by higher layer signaling; a new field may also be selected to indicate the MCS, i.e. to reinterpret the original field.

The third method comprises the following steps: and configuring periodic CSI semi-persistent scheduling information by using the UL Grant scrambled by the new C-RNTI.

The higher layer addition Information Element (IE) configures a new C-RNTI for periodic CSI use.

When a semi-persistent scheduling mechanism is adopted, a deactivated UL Grant may also be introduced, that is, when the deactivated UL Grant is received, the ue may stop reporting the periodic CSI. For the deactivated UL Grant, bits of the MCS and RV fields may be all set to "1" or "0", and/or bits of a Resource Block assignment and Hopping Resource Allocation indication field (Resource Block assignment and Hopping Resource Allocation) may be all set to "1" or "0", and/or bits of the TPC field and the DMRS cyclic shift field may be all set to "1" or "0".

Optionally, in this embodiment, the base station sends, to the user equipment, semi-persistent scheduling information of periodic CSI corresponding to reporting times for scheduling different reporting periods through different UL grants. As shown in fig. 4, there are 2 periods, and the reporting time in different periods corresponds to different UL grants.

In addition, it should be noted that, in this step, the base station may also adopt a dynamic scheduling mechanism, that is, the base station configures the UL Grant for transmitting the dynamic scheduling information of the CSI to the user equipment. Specifically, there are 3 configuration methods:

the method comprises the following steps: and scheduling or triggering the reporting of the periodic CSI by using the UL Grant scrambled by the C-RNTI for dynamic scheduling, wherein the periodic CSI is not reported if the user equipment does not receive the corresponding UL Grant at a certain reporting time. It is noted that the C-RNTI scrambled UL Grant for dynamic scheduling is to be distinguished from the C-RNTI scrambled UL Grant for scheduling of data traffic. The specific distinguishing method may adopt a method of the mode two (UL Grant scrambled by C-RNTI configures semi-persistent scheduling information of periodic CSI) in this step.

The second method comprises the following steps: and using the UL Grant scrambled by the SPS C-RNTI (not for semi-persistent scheduling, only multiplexing the SPS C-RNTI, and changing the attribute into dynamic scheduling), scheduling or triggering the reporting of the periodic CSI each time through one UL Grant, and not reporting the periodic CSI if the user equipment does not receive the corresponding UL Grant at a certain reporting time. It should be noted that, after the SPS data service is turned on, it is necessary to distinguish the case where the SPS data service is not transmitted, that is, the UL Grant scrambled by the SPSC-RNTI is only used to configure the dynamic scheduling information of the periodic CSI. The specific distinguishing method may adopt the method of the first mode (the semi-persistent scheduling information of the UL Grant configuration period CSI scrambled by the SPS C-RNTI) in this step 303.

The third method comprises the following steps: and configuring dynamic scheduling information of the periodic CSI by the UL Grant scrambled by the new C-RNTI.

And step 304, the base station sends the semi-persistent scheduling information of the periodic CSI to the user equipment through the configured UL Grant.

Before the user equipment sends the PUSCH to report the periodic CSI, it needs to know the scheduling information configured by the base station to the user equipment.

When the base station configures different UL grants for CSI with different reporting periods, in this step, the base station sends scheduling information of the CSI with different reporting periods to the user equipment through the configured different UL grants, respectively. At any reporting time, if the ue needs to report at least two CSI with different reporting periods, the base station only configures scheduling information of one UL Grant to be valid, where the UL Grant is a UL Grant corresponding to a maximum reporting period in the multiple different reporting periods.

Step 305, the base station receives CSI reported by the ue according to the transmission configuration information and the scheduling information.

In the transmission method of periodic CSI provided in this embodiment, the base station notifies the user equipment in advance to report the periodic CSI using the PUSCH, and then configures the frequency domain resources and MCS, etc. of the periodic CSI reported by the user equipment through the UL Grant, and the user equipment reports the periodic CSI through the PUSCH according to the frequency domain resources and MCS specified by the UL Grant. In addition, the base station optimizes the reporting time of the periodic CSI, so that the resource allocation is further simplified, and the frequency spectrum utilization rate is improved.

Corresponding to the method shown in fig. 3, as shown in fig. 6, the CSI transmission method according to an embodiment of the present invention is described by taking periodic CSI as an example, and it is to be understood that the present invention is not limited thereto. The method comprises the following steps:

step 401, the ue receives transmission configuration information of periodic CSI sent by the base station through a high-level signaling.

The user equipment can determine the reporting of the periodic CSI through the PUSCH and the reporting time of the periodic CSI according to the transmission configuration information. Wherein,the higher layer signaling is preferably RRC signaling. Specifically, the reporting time information includes a reporting period N of CSI of the downlink cell carrier_PAnd one of said N_PInitial offset N of_OFFSETThe user equipment will be based on the received N_PAnd N_OFFSETAnd calculating to obtain the periodic CSI reporting time according to the formula (1).

Step 402, the ue receives semi-persistent scheduling information of periodic CSI sent by the base station to the ue through the UL Grant.

Wherein 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 both periodic CSI and semi-persistent scheduling SPS data.

The user equipment can determine the frequency domain resource, MCS and the like of the CSI of the reporting period according to the semi-persistent scheduling information.

Specifically, in this step, the configuration manner of the UL Grant received by the ue is detailed in the previous embodiment, and is not described herein again.

In addition, it should be noted that, in this step, 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 sends the periodic CSI according to the dynamic scheduling information, specifically there are 3 methods:

the method comprises the following steps: and scheduling or triggering the reporting of the periodic CSI by using the UL Grant scrambled by the C-RNTI for dynamic scheduling, wherein the periodic CSI is not reported if the user equipment does not receive the corresponding UL Grant at a certain reporting time. It is noted that the C-RNTI scrambled UL Grant for dynamic scheduling is to be distinguished from the C-RNTI scrambled UL Grant for scheduling of data traffic. The specific distinguishing method may adopt a method of mode two (using C-RNTI to scramble the semi-persistent scheduling information of the UL Grant configuration period CSI) in this step 402.

The second method comprises the following steps: and using the UL Grant scrambled by the SPS C-RNTI (not for semi-persistent scheduling, only multiplexing the SPS C-RNTI, and changing the attribute into dynamic scheduling), scheduling or triggering the reporting of the periodic CSI each time through one UL Grant, and not reporting the periodic CSI if the user equipment does not receive the corresponding UL Grant at a certain reporting time. It should be noted that, after the SPS data service is turned on, it is necessary to distinguish the case where the SPS data service is not transmitted, that is, the UL Grant scrambled by the SPSC-RNTI is only used to configure the dynamic scheduling information of the periodic CSI. The specific distinguishing method may adopt the method of the first mode (the semi-persistent scheduling information of the UL Grant configuration period CSI scrambled by the SPS C-RNTI) in step 402.

In step 403, the ue reports the periodic CSI on the frequency domain resource indicated by the semi-persistent scheduling information through the PUSCH at the reporting time indicated by the transmission configuration information.

In this embodiment, the scheduling information in the UL Grant includes frequency domain resource allocation, that is, allocation of RBs. When various semi-persistent schedules need to be transmitted and the transmission time is different, the resource allocation becomes complicated. In order to simplify the resource allocation, the base station side performs optimization of the reporting time (step 301). For example, as shown in fig. 5, in this step, 3 different frequency domain resource sizes need to be allocated to meet 3 requirements when the periodic CSI of group 1 is transmitted alone, the periodic CSI of group 1 and group 2 is transmitted together, and the periodic CSI of group 1 and group 2 and the SPS are transmitted together. And configuring different UL grants for resource configuration for different periodic CSI. In this case, in this step, the user equipment may process in the following two ways:

the first method is as follows: at any reporting time, if at least two CSI with different reporting periods need to be reported, reporting the CSI only according to scheduling information of one UL Grant, wherein the UL Grant is the UL Grant corresponding to the largest reporting period in the at least two different reporting periods; that is, at the reporting time of the periodic CSI with a larger period, resource allocation is performed only according to the UL Grant corresponding to the larger period, and the frequency domain resource at a certain periodic reporting time indicated by the UL Grant corresponds to all periodic CSI information data to be transmitted at the reporting time. Specifically, as shown in fig. 4, there are 2 periods, and the reporting time in different periods corresponds to different ULGrant. When the periodic CSI of group 1 and group 2 occurs simultaneously, the periodic CSI of group 1 and group 2 is transmitted on the frequency domain resource indicated by the UL Grant corresponding to group 2 (large period) with a high priority.

When the SPS data service exists, if at least one CSI with different reporting periods needs to be reported and the SPS data service is transmitted at any reporting time, the CSI is reported and the SPS data service is transmitted only according to scheduling information of one ULGrant, wherein the ULGrant is the UL Grant corresponding to the largest period in the reporting periods of the CSI and the transmission periods of the SPS data service. Specifically, as shown in fig. 5, there are 3 periods, and the reporting time in different periods corresponds to different UL grants. When the periodic CSI of the group 1 and the periodic CSI of the group 2 simultaneously appear, the periodic CSI of the group 1 and the periodic CSI of the group 2 are sent on frequency domain resources indicated by UL Grant corresponding to the group 2 (large period) with high priority; when the periodic CSI of the group 1 and the periodic CSI of the group 2 and the SPS data service are simultaneously present, the periodic CSI of the group 1 and the periodic CSI of the group 2 and the SPS data service are transmitted on the frequency domain resource indicated by the ULGrant corresponding to the SPS data service (large period) with a high priority.

The frequency domain resources at the SPS reporting time include 4 RBs for transmitting the periodic CSI of group 1 and group 2 and the SPS data service, assuming that 3 RBs, 1RB and 1RB are respectively needed when the SPS data service, the periodic CSI of group 1 and the periodic CSI of group 2 independently configure resources; the frequency domain resource at the reporting time of the periodic CSI of the group 2 includes 2 RBs for transmitting the periodic CSI of the group 1 and the group 2; the frequency domain resource at the reporting time of the periodic CSI of group 1 includes 1RB for transmitting the periodic CSI of group 1. That is, only 4 RBs are needed when SPS data traffic is transmitted along with the periodic CSI for group 1 and group 2, saving 1 RB.

The second method comprises the following steps: at any reporting time, if at least two pieces of CSI with different reporting periods need to be reported, carrying out periodic CSI reporting according to a predetermined frequency domain expansion rule or a frequency domain resource determined by a frequency domain expansion signaling notified by the base station;

when the SPS data service exists, at any reporting time, if at least one CSI with different reporting periods needs to be reported and the SPS data service is transmitted, the periodic CSI reporting and the SPS data service transmission are carried out according to a predetermined frequency domain expansion rule or a frequency domain resource determined by a frequency domain expansion signaling notified by the base station.

And respectively indicating the frequency domain resources required by the periodic CSI information of different groups by using different UL Grants, and carrying out frequency domain resource reconfiguration according to a preset rule or a rule notified by a high-level signaling when different information is met. In addition, the MCS change rule when different information hits may also be predefined or signaled through higher layer signaling.

Specifically, the predetermined rule may be: when different information is met, the frequency spectrum resource is the superposition of the frequency domain resource indicated by the UL Grant corresponding to the different information; when different information is met, the spectrum resource is a frequency domain resource indicated by a UL Grant corresponding to a certain information, and M RBs (M is an integer greater than 1) are added upwards or downwards.

The higher layer signaling may inform which predefined rule is specifically adopted, or may inform the value of M in the above rule.

For example, also taking fig. 5 as an example, 3 RBs, 1RB and 1RB are independently configured for SPS, the periodic CSI of group 1 and the periodic CSI of group 2, respectively, and when 3 kinds of information are transmitted together, 2 RBs are automatically extended downward according to the resources configured by SPS; when the periodic CSI of group 1 and the periodic CSI of group 2 meet, the resources configured according to group 2 are automatically extended downward by 1 RB.

It should be noted that, at the reporting time of any period CSI, when the ue monitors the UL Grant scrambled by the C-RNTI for dynamic scheduling, the step preferably performs configuration according to the scheduling information of the UL Grant at this time.

In addition, when the base station adopts a dynamic scheduling mechanism to schedule the periodic CSI, the user equipment sends the periodic CSI according to the dynamic scheduling information. And scheduling or triggering the reporting of the periodic CSI each time through one UL Grant, wherein if the user equipment does not receive the corresponding UL Grant at a certain reporting moment, the periodic CSI is not reported.

In the transmission method of periodic CSI provided in this embodiment, the user equipment can use the PUSCH and report the periodic CSI according to the frequency domain resource specified by the UL Grant under the configuration and scheduling of the base station, so that the base station can flexibly configure CSI scheduling information through the UL Grant, and the user equipment can send the periodic CSI on an optimal channel, which can make the frequency domain resource utilization more effective.

Corresponding to the foregoing method, an embodiment of the present invention further provides a base station, as shown in fig. 7, including:

a sending unit 10, configured to send transmission configuration information of channel state information CSI to a user equipment, where the transmission configuration information includes transmission mode information and reporting time information, the transmission mode information is used to instruct the user equipment to report the CSI through a physical layer uplink shared channel PUSCH, and the reporting time information is used to instruct the user equipment to report the CSI at a time; sending CSI scheduling information to the user equipment through an uplink Grant (UL Grant);

a first receiving unit 11, configured to receive 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 invention can inform the user equipment to report the CSI by using the PUSCH in advance, and then inform the user equipment of the frequency domain resource, MCS and the like of reporting the CSI through the UL Grant, so that the user equipment can report the CSI according to the frequency domain resource and MCS specified by the UL Grant, and therefore, the flexible configuration of the CSI scheduling information can be carried out through the UL Grant. Moreover, the appropriate frequency domain resource and MCS can be selected for the user equipment according to the change condition of the channel quality, and the frequency domain resource can be more effectively utilized.

The sending unit 10 is specifically configured to send CSI transmission configuration information to the ue through a higher layer signaling, where the higher layer signaling is preferably a radio resource control RRC signaling.

In an embodiment of the present invention, as shown in fig. 8, the base station further includes a configuration unit 12, configured to configure the UL Grant for the transmitting unit 10, where the configured UL Grant is DCI scrambled by SPS C-RNTI, and the DCI scrambled by SPS C-RNTI after configuration does not include scheduling information of data, and satisfies one of the following two configurations:

the first configuration includes: the new data of the SPS C-RNTI scrambled DCI indicates that the bit value of the NDI domain is '0', and the bit values of the MCS and RV domains are '11101' or '11110' or '11111';

the second configuration includes: 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';

in another embodiment of the present invention, the UL Grant configured by the configuration unit 12 is DCI scrambled by C-RNTI, and the configured DCI scrambled by SPS C-RNTI does not include scheduling information of data, and satisfies one of the following three configurations:

the third configuration includes: the bit values of the MCS and RV domains of the DCI scrambled by the C-RNTI are 00000, and the number of PRBs (physical resource blocks) is an integer larger than 1;

the fourth configuration includes: the bit values of the MCS and RV domains of the DCI scrambled by the C-RNTI are '11100', and the number of PRBs is 1;

the fifth configuration includes: the bit value of the MCS and RV domain is '11110' or '11111', and the bit value of the CQI request domain is '1';

at this time, the sending unit 10 is specifically configured to send scheduling information of CSI to the user equipment through the ul grant configured by the configuration unit 12.

Optionally, the configuration unit 12 may be further configured to configure different UL grants for CSI with different reporting periods; then, the sending unit 10 is specifically configured to send the scheduling information of the CSI with different reporting periods to the user equipment through different UL grants configured by the configuration unit 12.

The base station provided by the embodiment of the invention can be applied to a scene of carrier aggregation of a plurality of downlink units. In order to more effectively utilize spectrum resources, the downlink unit carriers in one CA system may be grouped, and the downlink unit carriers may be grouped into at least one group. At this time, the CSI is specifically CSI of a downlink component carrier, and then, as shown in fig. 9, the base station of the embodiment of the present invention further includes a determining unit 13, configured to determine reporting time information of the CSI of the downlink component carrier, where the reporting time information includes a reporting period of the CSI of the downlink component carrier and an initial offset in one reporting period, so that:

in the reporting time information of the CSI of the downlink element carriers of the same group, the reporting period value and the starting offset value are the same, and in the reporting time information of the CSI of the downlink element carriers of different groups, the reporting period values are different, the starting offset values are the same, and a small reporting period value is a factor of a large reporting period value.

When there is an SPS data service, the determining unit 13 is further configured to determine reporting time information of the CSI of the downlink cell carrier according to a transmission period of the SPS data service and a reporting period of the CSI of each group of downlink cell carriers, where the reporting time information includes the reporting period of the CSI of the downlink cell carrier and an initial offset in one reporting period, so that:

the transmission period of the SPS data service is the same as the reporting period of the CSI of at least one group of downlink unit carriers, the reporting period is the same as the transmission period of the SPS data service in the reporting time information of the CSI of the at least one group of downlink unit carriers, and the initial offset is the same as the initial offset of the SPS data service in one transmission period;

when the transmission period of the SPS data service is greater than the reporting period of the CSI of at least one group of downlink unit carriers, in the reporting time information of the CSI of the at least one group of downlink unit carriers, the starting offset value is the same as the starting offset value of the SPS data service in one transmission period, and the reporting period value is a factor of the transmission period value of the SPS data service;

when the transmission period of the SPS data service is less than the reporting period of the CSI of at least one group of downlink component carriers, in the reporting time information of the CSI of the at least one group of downlink component carriers, the starting offset value is the same as the starting offset value of the SPS data service in one transmission period, and the reporting period value is a multiple of the transmission period value of the SPS data service.

At this time, the sending unit 10 is specifically configured to send transmission configuration information of CSI to the user equipment, where the transmission configuration information includes transmission mode information and reporting time information determined by the determining unit 13.

Corresponding to the foregoing method, an embodiment of the present invention further provides a user equipment, as shown in fig. 10, including:

a second receiving unit 20, configured to receive transmission configuration information of 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 instruct a user equipment to report the CSI through a physical layer uplink shared channel PUSCH, and the reporting time information is used to instruct the user equipment to report the CSI at a time; receiving scheduling information of CSI (channel state information) sent to the user equipment by the base station through the UL Grant;

and a reporting unit 21, configured to report the CSI to the base station through 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 invention can use the PUSCH under the configuration and scheduling of the base station and report the CSI according to the frequency domain resource specified by the UL Grant, so that the base station can flexibly configure the CSI scheduling information through the UL Grant. The user equipment can send the CSI on the preferred channel configured for it by the base station, which can make the frequency domain resource utilization more efficient.

The CSI can be transmitted on the preferred channel, enabling more efficient frequency domain resource utilization.

The UL Grant received by the second receiving unit 20 may specifically be SPS C-RNTI scrambled DCI, where the SPS C-RNTI scrambled DCI does not include scheduling information of data and satisfies one of the following two configurations:

the second configuration includes: and 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 UL Grant received by the second receiving unit 20 may also specifically be DCI scrambled by C-RNTI, where the DCI scrambled by C-RNTI does not include scheduling information of data and satisfies one of the following three configurations:

the fifth configuration includes: the bit values of the MCS and RV fields are "11110" or "11111", and the bit value of the CQI request field is "1".

The reporting unit 21 is specifically configured to:

at any reporting time, if at least two pieces of CSI with different reporting periods need to be reported, reporting the CSI only according to scheduling information of one UL Grant received by the second receiving unit 20, where the UL Grant is a UL Grant corresponding to a maximum reporting period of the at least two different reporting periods;

at any reporting time, if at least one CSI with different reporting periods needs to be reported and SPS data services are transmitted, the reporting of the CSI and the transmission of the SPS data services are performed only according to scheduling information of one UL Grant received by the second receiving unit 20, where the UL Grant is a UL Grant corresponding to a maximum period of a reporting period of the CSI and a transmission period of the SPS data services.

In addition, at the reporting time of any CSI, the reporting unit 21 is further specifically configured to report the CSI according to the scheduling information of the UL Grant for dynamic scheduling when the UL Grant scrambled by the C-RNTI for dynamic scheduling is monitored.

Those of ordinary skill in the art will understand that: all or part of the process for implementing the method embodiments may be implemented by hardware related to computer program instructions, where the program may be stored in a computer readable storage medium, and when executed, performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method for transmitting CSI, comprising:

the base station sends CSI scheduling information to the user equipment through uplink Grant information (UL Grant);

2. The transmission method according to claim 1,

the UL Grant is specifically as follows: downlink control information DCI scrambled by semi-persistent scheduling SPS radio network temporary identifier C-RNTI;

before the base station sends the scheduling information of the CSI to the user equipment through the uplink Grant information UL Grant, the method further includes:

the base station configures the DCI scrambled by the SPS C-RNTI, so that the configured DCI scrambled by the SPS C-RNTI does not contain scheduling information of data and one of the following two configurations is met:

the first configuration includes: the new data of the DCI scrambled by the SPS C-RNTI indicates that the bit value of the NDI domain is '0', and the bit values of the modulation coding scheme MCS and the redundancy version RV domain are '11101' or '11110' or '11111';

the second configuration includes: and 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 Cyclic Redundancy Check (CRC) bit is '1'.

3. The transmission method according to claim 1,

the UL Grant is specifically as follows: DCI scrambled by C-RNTI;

configuring the DCI scrambled by the C-RNTI, so that the configured DCI scrambled by the C-RNTI does not contain scheduling information of data and one of the following three configurations is satisfied:

4. The transmission method according to claim 1, wherein the method is applied to a scenario of aggregation of multiple downlink element carriers, where the CSI is specifically CSI of downlink element carriers, and the multiple downlink element carriers are divided into at least one group;

before the base station sends the transmission configuration information of the channel state information CSI to the user equipment, the method further includes:

the base station determines reporting time information of the CSI of the downlink unit carrier, wherein the reporting time information includes a reporting period of the CSI of the downlink unit carrier and an initial offset in the reporting period, so that:

the reporting period value and the starting offset value are the same in the reporting time information of the CSI of the downlink unit carriers of the same group, the reporting period values are different and the starting offset values are the same in the reporting time information of the CSI of the downlink unit carriers of different groups, and the small reporting period value is a factor of the large reporting period value.

5. The transmission method according to claim 4, wherein the determining, by the base station, reporting time information of the CSI of the downlink cell carrier includes:

when an SPS data service exists, determining reporting time information of CSI of downlink unit carriers according to a transmission period of the SPS data service and a reporting period of the CSI of each group of downlink unit carriers, wherein the reporting time information comprises the reporting period of the CSI of the downlink unit carriers and an initial offset in one reporting period, so that:

6. The transmission method according to claim 1, wherein before the base station sends the scheduling information of the CSI to the user equipment through the uplink Grant information UL Grant, the method further comprises:

the base station configures different UL Grants for CSI with different reporting periods;

the base station sends the scheduling information of the CSI to the user equipment through the uplink Grant information (UL Grant) and comprises the following steps:

and the base station respectively sends the scheduling information of the CSI with different reporting periods to the user equipment through the configured different UL Grants.

7. A method for transmitting CSI, comprising:

8. The transmission method according to claim 7,

the UL Grant is specifically downlink control information DCI scrambled by SPS C-RNTI, the DCI scrambled by SPS C-RNTI does not contain scheduling information of data, and one of the following two configurations is satisfied:

9. The transmission method according to claim 7,

the UL Grant is specifically as follows: the DCI scrambled by the C-RNTI does not contain scheduling information of data and meets one of the following three configurations:

10. The transmission method according to claim 7,

the reporting of the CSI according to the transmission configuration information and the scheduling information includes:

at any reporting time, if at least two pieces of CSI with different reporting periods need to be reported, reporting the CSI only according to scheduling information of one UL Grant, wherein the UL Grant is the UL Grant corresponding to the largest reporting period of the at least two different reporting periods;

or

At any reporting time, if at least one CSI with different reporting periods needs to be reported and SPS data services are transmitted, the reporting of the CSI and the transmission of the SPS data services are carried out only according to scheduling information of one UL Grant, wherein the UL Grant is the UL Grant corresponding to the largest period in the reporting period of the CSI and the transmission period of the SPS data services.

11. A base station, comprising:

12. The base station of claim 11, further comprising a configuration unit, configured to configure the UL Grant for the transmitting unit, where the configured UL Grant is a DCI scrambled by an SPS C-RNTI, and the configured DCI scrambled by the SPS C-RNTI does not include scheduling information of data, and satisfies one of the following two configurations:

then, the sending unit is specifically configured to send, to the user equipment, scheduling information of CSI through the ULGrant configured by the configuration unit.

13. The base station of claim 11, further comprising a configuration unit, configured to configure the UL Grant for the transmitting unit, where the configured UL Grant is DCI scrambled by C-RNTI, and the configured DCI scrambled by SPS C-RNTI does not contain scheduling information of data, and satisfies one of the following three configurations:

14. The base station of claim 11,

the base station is applied to a scene of aggregation of a plurality of downlink unit carriers, wherein the CSI is specifically CSI of the downlink unit carriers, and the downlink unit carriers are divided into at least one group;

the base station further includes a determining unit, configured to determine reporting time information of the CSI of the downlink component carrier, where the reporting time information includes a reporting period of the CSI of the downlink component carrier and a starting offset in the reporting period, so that:

in the reporting time information of the CSI of the downlink unit carriers of the same group, the reporting period value and the initial offset value are the same, and in the reporting time information of the CSI of the downlink unit carriers of different groups, the reporting period values are different, the initial offset values are the same, and a small reporting period value is a factor of a large reporting period value;

the sending unit is specifically configured to send transmission configuration information of the channel state information CSI to the user equipment, where the transmission configuration information includes transmission mode information and reporting time information determined by the determining unit.

15. The base station of claim 14, wherein when there is an SPS data service, the determining unit is further configured to determine reporting time information of the CSI of the downlink component carrier according to the transmission period of the SPS data service and the reporting period of the CSI of each set of downlink component carriers, so that:

when the transmission period of the SPS data service is greater than the reporting period of the CSI of at least one group of downlink unit carriers, in the reporting time information of the CSI of the at least one group of downlink unit carriers, the starting offset value is the same as the starting offset value of the SPS data service in one transmission period, and the reporting period value is a factor of the transmission period value of the SPS data service; when the transmission period of the SPS data service is less than the reporting period of the CSI of at least one group of downlink component carriers, in the reporting time information of the CSI of the at least one group of downlink component carriers, the starting offset value is the same as the starting offset value of the SPS data service in one transmission period, and the reporting period value is a multiple of the transmission period value of the SPS data service.

16. The base station of claim 11, further comprising a configuration unit, configured to configure different UL grants for CSI with different reporting periods;

the sending unit is specifically configured to send the scheduling information of the CSI with different reporting periods to the user equipment through different ulgrants configured by the configuration unit, respectively.

17. A user device, comprising:

18. The user equipment of claim 17,

the UL Grant received by the second receiving unit is specifically SPS C-RNTI scrambled downlink control information DCI, where the SPS C-RNTI scrambled DCI does not include scheduling information of data and satisfies at least one of the following two configurations:

the second configuration includes: and the bit value of each virtual CRC check bit of the DCI scrambled by the SPS C-RNTI is 1.

19. The user equipment of claim 17,

the UL Grant received by the second receiving unit is specifically DCI scrambled by C-RNTI, and the DCI scrambled by C-RNTI does not include scheduling information of data and satisfies one of the following three configurations:

20. The ue of claim 17, wherein the reporting unit is specifically configured to:

at any reporting time, if at least two pieces of CSI with different reporting periods need to be reported, reporting the CSI only according to scheduling information of one type of UL Grant received by the second receiving unit, wherein the UL Grant is the UL Grant corresponding to the largest reporting period in the at least two different reporting periods;

or

At any reporting time, if at least one CSI with different reporting periods needs to be reported and SPS data services are transmitted, reporting the CSI and transmitting the SPS data services only according to scheduling information of one UL Grant received by the second receiving unit, where the UL Grant is a UL Grant corresponding to a maximum period of a reporting period of the CSI and a transmission period of the SPS data services.