CN101505498A - Downlink control information sending method, related system and apparatus - Google Patents
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Abstract
The invention discloses a downlink control information sending method and a related system thereof and a related device thereof. In the technical proposal, a terminal is arranged on at least one component carrier wave of a subframe to receive and transmit data, and a network side uses the set corresponding DCI Format to send the uplink and downlink dispatching information for the terminal on the downlink component carrier wave according to an index of the component carrier wave; a terminal side detects the corresponding DCI Format on the downlink component carrier wave according to the index of the carrier wave, thereby realizing the flexible arrangement of DCI format of the uplink and downlink dispatching information which is sent on the downlink carrier wave component and used for the terminal, achieving better backward compatibility, as well as saving signaling cost and improving the performance of the LTE system within a limitation of a reasonable number of blind tests.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method for sending Downlink Control Information (DCI), and a related system and device.
Background
Fig. 1A and 1B illustrate frame structures of a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode in a Long Term Evolution (LTE) system, respectively. In the frame structure of the FDD mode, as shown in fig. 1A, one radio frame (radio frame) of 10ms is composed of twenty slots (slots) with the length of 0.5ms and the number of 0 to 19, and the slots 2i and 2i +1 constitute a subframe (subframe) i with the length of 1 ms. In the frame structure of TDD mode, as shown in fig. 1B, a 10ms radio frame is composed of two half-frames (half frames) with length of 5ms, and one half-frame includes 5 subframes with length of 1 ms; subframe i is defined as 2 slots 2i and 2i +1 of length 0.5 ms. In both frame structures, for a standard cyclic prefix (Normal CP), a slot contains 7 symbols with a length of 66.7us, wherein the CP length of the first symbol is 5.21us, and the CP length of the remaining 6 symbols is 4.69 us; for extended CP (extended CP), a slot contains 6 symbols, and the CP length of all symbols is 16.67 us.
The following three downlink physical control channels are defined in the LTE system: a Physical Control Format Indicator Channel (PCFICH), a Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channel (PHICH), and a Physical Downlink Control Channel (PDCCH).
The PCFICH is used for indicating a control channel format, specifically indicating the number information of (OFDM,) symbols used for PDCCH transmission in one subframe, and is transmitted on the first OFDM symbol of the subframe, where the frequency position is determined by the downlink bandwidth and cell Identity (ID) of the LTE system.
The PHICH is used for ACK/NACK feedback information of an uplink transmission Hybrid Automatic repeat request (H-ARQ). The number of PHICH resources, time-frequency location, may be jointly decided by system messages and cell ID in a Physical Broadcast Channel (PBCH).
The PDCCH is used for transmitting control information such as uplink and downlink scheduling information and common control information. The formats of DCI are classified into the following: the DCI format 0 is used for scheduling a Physical Uplink Shared Channel (PUSCH); the DCI format1, the DCI format 1A, the DCI format 1B, the DCI format1C, and the DCI format 1D are used for different modes of Physical Downlink Shared Channel (PDSCH) codeword scheduling; the DCI format 2 and the DCI format 2A are used for different modes of space division multiplexing; the DCI format 3 and the DCI format 33A are used for different modes of a power Control command for a Physical Uplink Control Channel (PUCCH) and a Physical downlink Control Channel (PUSCH).
The physical Resource for PDCCH transmission is in Control Channel Element (CCE) units, the size of a CCE is 9 Resource Element Groups (REGs), that is, 36 Resource Elements (REs), and the number of CCEs possibly occupied by the PDCCH may be 1, 2, 4, and 8.
For the sizes of the four PDCCH physical resources of 1, 2, 4, 8 CCEs, tree Aggregation (Aggregation) is adopted, that is: the PDCCH of one CCE may start from an arbitrary CCE location; PDCCHs of two CCEs start from even CCE locations; PDCCHs of four CCEs start from CCE positions that are integer multiples of four; the eight-CCE PDCCH starts at an integer multiple of eight CCE locations. Each CCE Aggregation Level (Aggregation Level) defines a Search Space (Search Space) including a common Search Space (common) and a User Equipment (UE) Specific Search Space (UE-Specific). The number of CCEs in the entire search space, i.e., the length of the search space, is determined by the number of OFDM symbols and the number of PHICH groups occupied by the PDCCH indicated by the PCFICH in each downlink subframe. And the UE carries out blind detection on all possible PDCCH code rates in the search space according to the DCI format of the transmission mode.
The UE is set to receive data of PDSCH Transmission according to PDCCH indication of UE-specific search space based on one of the following Transmission modes (Transmission Mode) through semi-static (semi-static) of higher layer signaling: single-antenna port, port 0(Single-antenna port; port 0); transmit diversity (Transmit diversity); open-loop spatial multiplexing (Open-loop spatial multiplexing); closed-loop spatial multiplexing (Closed-loop spatial multiplexing); multi-user Multiple Input Multiple Output (MIMO), Multiple-Input Multiple-output (Multiple-user MIMO); closed-loop Rank 1 precoding (Closed-loop Rank 1 precoding) Single antenna port, port 5(Single-antenna port; port 5).
If the UE is set by the higher layer to perform PDCCH decoding using Cyclic Redundancy Check (CRC) scrambled by a Cell radio network Temporary Identifier (C-RNTI), the UE decodes the PDCCH and all related PDSCHs according to the corresponding combinations defined in table 1.
TABLE 1 PDCCH and PDSCH set by C-RNTI
If the UE is configured by the higher layer to perform PDCCH decoding using a CRC scrambled by a Semi-persistent Scheduled Radio Network Temporary Identifier (SPS-RNTI), the UE decodes the PDCCH and all related PDSCHs according to the corresponding combinations defined in Table 2.
TABLE 2 PDCCH and PDSCH set by SPS-C-RNTI
The UE should detect a set of candidate PDCCHs at every non-Discontinuous Reception (non-DRX) subframe to acquire control information. The detection means that the PDCCH in the group is decoded according to all DCIformat to be detected. The UE should detect one common search space with aggregation levels of 4 and 8, respectively, and one UE-specific search space with aggregation levels of 1, 2, 4, 8, respectively. The common search space and the UE-specific search space may overlap. The search space defined by the aggregation level is shown in table 3. The DCI format that the UE should detect depends on the set transmission mode as described above.
TABLE 3 candidate PDCCH to be examined by UE
LTE Release-8 defines 6 bandwidths: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20 MHz.
LTE-Advanced-Further Advances for E-UTRA is an evolved version of LTERElease-8. Unless 3GPP TR 25.913 is met or exceeded: all relevant Requirements of "Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN)" are met or exceeded by IMT-Advanced Requirements set forth by ITU-R. Wherein, the requirement of backward compatibility with LTE Release-8 refers to that: the UE of LTE Release-8 can work in an LTE-Advanced system; the terminal of LTE-Advanced can work in LTE Release-8 system. In addition, LTE-Advanced should be able to operate with different size spectrum configurations, including wider spectrum configurations than LTE Release-8, such as 100MHz of contiguous spectrum resources, to achieve higher performance and target peak rates. In consideration of compatibility with lte erelease-8, for a bandwidth greater than 20MHz, a carrier aggregation (carrieragregation) approach is adopted, that is: two or more component carriers (component carriers) are aggregated to support a downlink transmission bandwidth greater than 20MHz, and a UE is capable of receiving one or more component carriers simultaneously in its capability; the LTE-Advanced UE with the receiving capability of more than 20MHz can simultaneously receive the transmission on a plurality of component carriers, the LTE Release-8 UE can only receive the transmission on one component carrier, and the structure of the component carrier conforms to the LTE Release-8 specification.
Currently, the specific implementation of PDCCH in LTE-Advanced is composed of different combinations of coding and transmission schemes, which are described below separately.
The separate coding and separate transmission means that the PDCCH is transmitted on a single component carrier, and uplink and downlink scheduling information of each component carrier is separately coded and is on the same carrier as the scheduled PDSCH. The uplink and downlink scheduling information of each component carrier is independently coded, so that the signaling overhead is large; moreover, since only a single component carrier is used for transmission, the UE needs to perform blind detection on all the component carriers configured for the UE, so that the number of times of blind detection performed by the UE is very large.
Joint coding and individual transmission refer to that the PDCCH is transmitted on a specific component carrier, and uplink and downlink scheduling information of a plurality of component carriers are jointly coded. Because the uplink and downlink scheduling information of the joint coding is transmitted, the length of the information is larger, and when a plurality of UEs exist, the uplink and downlink scheduling information of each UE is probably transmitted near the same CCE position, which causes the blocking probability of the PDCCH to be higher; moreover, since dynamic scheduling of component carriers cannot be realized, when the number of actually scheduled component carriers is less than the number of semi-statically configured component carriers, resource waste is caused, and even the overhead is greater than that of single coding.
Joint coding and joint transmission refer to that the PDCCH is transmitted on a plurality of component carriers, and uplink and downlink scheduling information of the plurality of component carriers are jointly coded. Since the performance of the selected CCEs cannot be made to be similar, the backward compatibility is poor; moreover, since dynamic scheduling of component carriers cannot be realized, when the number of actually scheduled component carriers is less than the number of semi-statically configured component carriers, resource waste is caused, and even the overhead is greater than that of single coding.
The primary PDCCH and the secondary PDCCH refer to that the DCI format of the secondary PDCCH is dynamically or semi-statically notified through information carried in the primary PDCCH with a fixed format, so that the problem of resource waste caused by joint coding of the fixed DCI format is solved, but the scheme has a decoding chain problem, that is, the performance of the primary PDCCH severely restricts the performance of the overall PDCCH.
Disclosure of Invention
In view of this, the present invention mainly aims to provide a method for sending downlink control information, and a related system and device, which save signaling overhead and improve the performance of the LTE system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a Downlink Control Information (DCI) sending method is disclosed, a terminal is configured to send and receive data on at least one component carrier of the same subframe, the method comprises the following steps: the network side transmits uplink and downlink scheduling information for the terminal on the downlink component carrier by using the set corresponding DCIFormat according to the component carrier index; and the terminal side detects the corresponding DCI Format on the downlink component carrier according to the component carrier index.
The DCI format for the uplink and downlink scheduling information of the terminal includes: a subset of a DCI format set for uplink and downlink scheduling information of a terminal, the DCI format set comprising: DCI format carrying uplink and downlink scheduling information of k component carriers, where k is 1, 2, 3.. n, n is the number of component carriers in the same subframe configured to a terminal.
The DCI format corresponding to the mth component carrier carries kmUplink scheduling information and/or downlink scheduling information of each component carrier, wherein m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1mN or less, kmDetermined by the component carrier index.
K ismDetermined by the component carrier index, further, kmM; or, said kmOver time, further, km(i + m) modn +1, i is the subframe number; or, said km＝1。
The component carrier indices m and kmThe corresponding relation of (a) is specified by network side signaling.
The DCI format for the uplink and downlink scheduling information of the terminal comprises the following steps: a scheduling indication indicating a corresponding component carrier scheduled by the DCIformat; and/or, the scheduling information is used for indicating the scheduling condition of the uplink and downlink scheduling information of the terminal on the other downlink component carriers in the same subframe.
The scheduling indication information of the corresponding component carrier scheduled by the DCI format is p bits, wherein each bit corresponds to one component carrier, and the component carriers corresponding to the bits are different from each other;
the scheduling indication condition of the other downlink component carriers is represented by 1bit and is used for indicating whether the other downlink component carriers in the same subframe bear the DCIFormat for the uplink and downlink scheduling information of the terminal, or the scheduling condition of the other downlink component carriers is represented by n-1 bits, wherein each bit corresponds to one component carrier in the other downlink component carriers, the component carriers corresponding to each bit are different from each other and are used for indicating whether the corresponding downlink component carriers bear the DCI Format for the uplink and downlink scheduling information of the terminal, or the scheduling condition of the other downlink component carriers is represented by q bits and is used for indicating that the component carriers bear the serial number of the DCI Format for the uplink and downlink scheduling information of the terminal in the same subframe, or the scheduling condition of the other downlink component carriers is represented by q bits and is used for indicating that the downlink component carriers bear the DCI Format for the uplink and downlink scheduling information of the terminal in the same subframe Total number of carriers.
The method further comprises the following steps: informing a terminal of a transmission mode on the component carrier.
And the downlink component carrier wave for transmitting the DCI format of the uplink and downlink scheduling information of the terminal also transmits the DCI format of the common control information.
A system for implementing DCI transmission, a terminal configured to transmit and receive data on at least one component carrier of a same subframe, the system comprising: the network side is used for transmitting uplink and downlink scheduling information for the terminal on the downlink component carrier by using the set corresponding DCI Format according to the component carrier index; and the terminal is used for detecting the corresponding DCI Format on the downlink component carrier according to the component carrier index.
A DCI transmission apparatus in which a terminal is configured to transmit and receive data on at least one component carrier of the same subframe, the apparatus comprising: the device comprises a coding unit and a sending unit, wherein the coding unit is used for transmitting uplink and downlink scheduling information for a terminal on a downlink component carrier by using a set corresponding DCI Format according to a component carrier index; the sending unit is configured to transmit DCI format for uplink and downlink scheduling information of a terminal on a downlink component carrier.
According to the description, the invention realizes the flexible dynamic configuration of the coding mode of the DCI format which is transmitted on the downlink carrier component and used for the uplink and downlink scheduling information of the terminal, and has better backward compatibility; within the limit of reasonable blind detection times, the advantages of joint coding can be fully utilized, signaling overhead is saved, and the performance of an LTE system is improved. The flexible transmission configuration mode provided by the scheme of the invention well relieves the problem of high blocking probability of the existing joint coding PDCCH, can well solve the problem of sending downlink control information in carrier aggregation, is favorable for the compatibility of LTE-Advanced and LTE Release-8, and is favorable for the realization of an LTE-Advanced system.
Drawings
FIG. 1A is a diagram illustrating a frame structure in FDD mode;
FIG. 1B is a diagram of a TDD mode frame structure;
FIG. 2 is a flow chart of DCI format transmission from the network side according to the present invention;
fig. 3 is a schematic diagram of a system structure for implementing downlink control information transmission in the present invention;
fig. 4 is a schematic structural diagram of an apparatus for implementing downlink control information transmission in the present invention.
Detailed Description
In the invention, a terminal is configured on at least one component carrier wave of the same subframe for receiving and transmitting data, and a network side transmits uplink and downlink scheduling information for the terminal on the downlink component carrier wave by using a set corresponding DCI Format according to a component carrier wave index; and the terminal side detects the corresponding DCI Format on the downlink component carrier according to the component carrier index. The DCI Format used for the uplink and downlink scheduling information of the terminal and the component carrier index have a certain corresponding relation, and the corresponding relation can be preset at a network side and a terminal side; or determined by the network side and notified to the terminal.
The DCI format for the uplink and downlink scheduling information of the terminal includes: a subset of a DCI format set for uplink and downlink scheduling information of a terminal, the DCI format set comprising: DCI format carrying uplink and downlink scheduling information of k component carriers, where k is 1, 2, 3.. n, n is the number of component carriers in the same subframe configured to a terminal.
The DCI format corresponding to the mth component carrier carries kmUplink scheduling information and/or downlink scheduling information of each component carrier, wherein m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1mN or less, kmDetermined by a component carrier index, said kmM; or, kmVarying with time, e.g. km(i + m) modn +1, i is the subframe number; k ism1. The component carrier indices m and kmThe corresponding relation of (a) may be preset, or may be dynamically specified by the network side through signaling.
Fig. 2 is a flowchart of network side sending DCI format in the present invention, and as shown in fig. 2, a specific processing procedure of network side sending DCI format includes the following steps:
step 201: the terminal is configured to transmit and receive data on n component carriers of the same subframe, and the network side determines the transmission mode of the DCI format of the uplink and downlink scheduling information of each component carrier on each downlink component carrier configured to the terminal. According to the LTE system in practical application, n is more than or equal to 1 and less than or equal to 5.
Step 202: the network side informs the terminal of the sending mode, which can be realized by high-level signaling. The specific implementation of the network side notifying the terminal of the sending mode may be: the network side directly notifies the DCI format of the uplink and downlink scheduling information of each component carrier of the terminal and the coding mode adopted when each downlink component carrier transmits the DCI format for the uplink and downlink scheduling information of the terminal, and in this implementation, the network side also needs to determine the DCI format of the uplink and downlink scheduling information of each component carrier in step 201; the following steps can be also included: the network side notifies the terminal of the transmission mode of each component carrier and the coding mode adopted when each downlink component carrier transmits the DCI format used for the uplink and downlink scheduling information of the terminal.
Step 203: the network side determines DCIformat of uplink and downlink scheduling information of a component carrier needing to be transmitted, determines downlink component carrier needing to transmit DCI format used for the uplink and downlink scheduling information of the terminal according to the DCI format needing to be transmitted, codes the DCI format of the uplink and downlink scheduling information of the component carrier needing to be transmitted according to the coding mode of the DCI format on the downlink component carrier to obtain the DCI format used for the uplink and downlink scheduling information of the terminal, and transmits the DCI format used for the uplink and downlink scheduling information of the terminal on the downlink component carrier. The DCI format for the uplink and downlink scheduling information of the terminal transmitted on the downlink component carrier includes a subset of a DCI format set for the uplink and downlink scheduling information of the terminal, where the DCI format set includes: DCI format of uplink and downlink scheduling information of a single component carrier, and DCI format jointly encoded by uplink and downlink scheduling information of k component carriers, where k is 2, 3. The DCI format transmitted on the downlink component carrier may further include a DCI format for common control information.
The coding scheme in the sending scheme determined by the network side in step 201 may be that DCI format for uplink and downlink scheduling information of the terminal transmitted on the mth component carrier is pair kmObtaining DCI format after DCI format joint coding of uplink and downlink scheduling information of each component carrier, wherein m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1 and less than or equal to kmN is less than or equal to n. K ismMay be determined by a component carrier index, e.g., kmM; or, kmVarying with time, e.g. km(i + m) modn +1, i is the subframe number; or, said k m1. Step by stepIn step 202, for the mth component carrier, the network side may notify the terminal of the coding scheme k used when the mth component carrier transmits the DCI format for the uplink and downlink scheduling information of the terminalm。kmAnd a DCI format number indicating the number of uplink and downlink scheduling information for the joint-coded component carriers included in the DCI format for the terminal uplink and downlink scheduling information.
And the terminal carries out DCI format detection on the configured downlink component carrier wave according to the sending mode. The DCI format for the uplink and downlink scheduling information of the terminal detected by the terminal includes a subset of a DCI format set for the uplink and downlink scheduling information of the terminal, where the DCI format set includes: DCI format of uplink and downlink scheduling information of a single component carrier, and DCI format jointly encoded by uplink and downlink scheduling information of k component carriers, where k is 2, 3. The terminal also detects the common control information DCI format on the configured downlink component carrier.
When the network side directly notifies the DCI format of the uplink and downlink scheduling information of each component carrier of the terminal and the coding mode adopted when each downlink component carrier transmits the DCI format for the uplink and downlink scheduling information of the terminal, the specific implementation of the terminal performing DCI format detection on the configured downlink component carrier according to the transmission mode is as follows: and on the configured downlink component carrier, performing corresponding DCI format detection according to the corresponding coding mode and the DCI format of the uplink and downlink scheduling information of each component carrier, which is notified by the network side. When the network side notifies the terminal of the transmission mode of each component carrier and the coding mode adopted when each downlink component carrier transmits the DCI format used for the uplink and downlink scheduling information of the terminal, the specific implementation that the terminal performs the DCI format detection on the configured downlink component carrier according to the transmission mode is as follows: and the terminal determines the DCI format of the uplink and downlink scheduling information of each component carrier according to the transmission mode of each component carrier, and performs corresponding DCI format detection on the configured downlink component carrier according to the corresponding coding mode and the DCI format of the uplink and downlink scheduling information of each component carrier determined according to the transmission mode.
In addition, the network side and the terminal may set in advance the coding scheme of DCI format of uplink and downlink scheduling information of each component carrier on each component carrier allocated to the terminal, and the setting in advance in the terminal may be realized by signaling allocation. In this way, the network side may directly execute step 203, and the terminal determines the DCI format of the uplink and downlink scheduling information of each component carrier according to the transmission mode of each component carrier, and performs corresponding DCI format detection on the configured downlink component carrier according to the corresponding coding method and the DCI format of the uplink and downlink scheduling information of each component carrier determined according to the transmission mode. The transmission mode of each component carrier may be notified to the terminal through higher layer signaling on the network side.
For example, the terminal determines that the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the mth component carrier is for k according to the preset coding mode of the DCI format for the uplink and downlink scheduling information of each component carrier on each component carrier configured to the terminalmDCI format obtained after DCIformat joint coding of uplink and downlink scheduling information of each component carrier, wherein m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1 and less than or equal to kmN is less than or equal to n. K ismMay be determined by a component carrier index, e.g., kmM; or, kmVarying with time, e.g. km(i + m) modn +1, i is the subframe number; or, said km＝1。
In step 203, the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the downlink component carrier may include a scheduling indication for indicating a component carrier scheduled by the DCI format, so that after the terminal detects the DCI format, the terminal can obtain the component carrier to which the uplink and downlink scheduling information in the DCI format is directed according to the scheduling indication included in the detected DCI format. For example, if the terminal is configured to transmit and receive data on 3 component carriers of the same subframe, the form of the scheduling indication may be 101, which is used to indicate that uplink and downlink scheduling information in the DCI format including the scheduling indication is directed to component carrier 1 and component carrier 3, and therefore, the terminal determines that the uplink and downlink scheduling information included in the DCI format for the uplink and downlink scheduling information of the terminal is directed to component carrier 1 and component carrier 3.
In step 203, the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the downlink component carrier may further include a scheduling condition, that is, a blind detection indication, for indicating whether the DCI format for the uplink and downlink scheduling information of the terminal is carried on the other downlink component carriers in the same subframe, so that after the terminal detects the dcifomat, the terminal can know whether DCI format detection needs to be performed on the other downlink component carriers in the same subframe according to the blind detection indication included in the detected DCI format, so as to save the number of blind detections. The blind detection indication can be realized by one bit (bit), namely, whether DCI format used for uplink and downlink scheduling information of the terminal is carried on the rest downlink component carriers is indicated by two states of 1 bit; the method can also be realized by a bitmap, namely, one bit of the bitmap is set to correspond to one other downlink component carrier, the bitmap comprises n-1 bits, and the value of each bit of the bitmap indicates whether the corresponding downlink component carrier bears DCI format for the uplink and downlink scheduling information of the terminal; the total number information of the downlink component carriers may be the remaining total number or the total number. If the total number information is the remaining total number, indicating that the rest downlink component carriers also bear DCI format for the uplink and downlink scheduling information of the terminal when the remaining total number is not 0; otherwise, it indicates that the rest downlink component carriers do not carry the DCI format for the uplink and downlink scheduling information of the terminal. If the total information is all total, the terminal compares the number of the downlink component carriers with which the DCI format is detected with all the total, and if the number of the downlink component carriers with which the DCI format is detected is less than all the total, the terminal indicates that the DCI format used for the uplink and downlink scheduling information of the terminal is also carried on the rest downlink component carriers; otherwise, it indicates that the rest downlink component carriers do not carry the DCI format for the uplink and downlink scheduling information of the terminal. The blind detection indication can also be realized by the serial number of the DCI Format, the network side numbers the DCI Format transmitted on each downlink component carrier continuously, and the terminal determines whether the DCI Format used for the terminal uplink and downlink scheduling information is carried on the remaining downlink component carriers according to the detected serial number of the DCI Format, for example, the terminal only detects the DCI Format with the serial number of 3, so the terminal determines that two DCI formats before the DCI Format need to be detected according to the serial number of 3.
In addition, the network side may also notify the terminal of the CCE aggregation level and/or the search space length, so that the terminal may detect the DCI format more efficiently, and may specifically implement the detection by using higher layer signaling.
The following describes the processing on the network side and the terminal side according to the present invention in more detail, taking as an example that the terminal is configured to transmit and receive data on three component carriers of the same subframe. The three component carriers are a first component carrier, a second component carrier and a third component carrier, respectively.
Detailed description of the preferred embodiment
In this embodiment, in a specific implementation, the network side directly notifies the DCI format of the uplink and downlink scheduling information of each component carrier of the terminal, and a coding mode used when each downlink component carrier transmits the dciformt for the uplink and downlink scheduling information of the terminal. The specific treatment process comprises the following steps:
step 301: and the network side determines the DCI format of the uplink and downlink scheduling information of each component carrier. Specifically, the network side determines that the DCI format of the uplink scheduling information of the first component carrier is DCI format1, the DCI format of the downlink scheduling information is DCI format 1A, determines that the DCI format of the uplink scheduling information of the second component carrier is DCI format 1A, the DCI format of the downlink scheduling information is DCI format1, and determines that the DCI format of the uplink scheduling information of the third component carrier is DCI format1, and the DCI format of the downlink scheduling information is DCI format 2.
The network side also determines the coding mode of the DCI format of the uplink and downlink scheduling information of each component carrier on each component carrier configured to the terminal. Specifically, the network side determines DCI format of uplink and downlink scheduling information for transmitting a single component carrier on a first downlink component carrier, DCI format of uplink and downlink scheduling information joint coding for transmitting two component carriers on a second downlink component carrier, and DCI format of uplink and downlink scheduling information joint coding for transmitting three component carriers on a third downlink component carrier.
Step 302: the network side notifies the DCI format of the uplink and downlink scheduling information of each component carrier determined in step 301, that is, the DCI format of the uplink scheduling information of the first component carrier is DCI format1, the DCI format of the downlink scheduling information is DCI format 1A, the DCI format of the uplink scheduling information of the second component carrier is DCI format 1A, the DCI format of the downlink scheduling information is dciformt 1, the DCI format of the uplink scheduling information of the third component carrier is DCI format1, and the DCI format of the downlink scheduling information is DCI format 2.
And, the network side notifies the terminal of the coding mode of the DCI format of the uplink and downlink scheduling information of each component carrier determined in step 301 on each component carrier configured to the terminal, that is, the DCI format of the uplink and downlink scheduling information of a single component carrier transmitted on the first downlink component carrier, the DCI format of the uplink and downlink scheduling information joint coding of two component carriers transmitted on the second downlink component carrier, and the DCI format of the uplink and downlink scheduling information joint coding of three component carriers transmitted on the third downlink component carrier.
Step 303: the network side determines DCIformat of uplink and downlink scheduling information of a component carrier needing to be transmitted, determines downlink component carrier needing to transmit DCI format used for the uplink and downlink scheduling information of the terminal according to the DCI format needing to be transmitted, codes the DCI format of the uplink and downlink scheduling information of the component carrier needing to be transmitted according to the coding mode of the DCI format on the downlink component carrier to obtain the DCI format used for the uplink and downlink scheduling information of the terminal, and transmits the DCI format used for the uplink and downlink scheduling information of the terminal on the downlink component carrier. Specifically, the network side determines that the DCI format1 of the uplink scheduling information and the DCI format 1A of the downlink scheduling information of the first component carrier, the DCI format 1A of the uplink scheduling information and the DCI format1 of the downlink scheduling information of the second component carrier need to be transmitted; since DCI format of uplink and downlink scheduling information of two component carriers needs to be transmitted, therefore, the DCI format used for the uplink and downlink scheduling information of the terminal is determined to need to be transmitted on the second downlink component carrier, in this way, the network side transmits DCI format for the uplink and downlink scheduling information of the terminal on the second downlink component carrier, and, the DCI format for the uplink and downlink scheduling information of the terminal is a DCI format jointly encoded by the uplink scheduling information of the first component carrier and the uplink scheduling information of the second component carrier, and a DCI format jointly encoded by the downlink scheduling information of the first component carrier and the downlink scheduling information of the second component carrier, namely, the DCI format for the uplink and downlink scheduling information of the terminal is the DCI format obtained by joint coding of DCI format1 and DCI format 1A, and the DCI format obtained by joint coding of DCI format 1A and DCI format 1.
Step 304: and the terminal performs corresponding DCIformat detection on the configured downlink component carriers according to the corresponding coding mode and DCI format of the uplink and downlink scheduling information of each component carrier notified by the network side. Specifically, since the DCI format of the uplink and downlink scheduling information of a single component carrier is transmitted on the first downlink component carrier, the terminal detects, on the first downlink component carrier, DCI format1 of the uplink scheduling information and DCI format 1A of the downlink scheduling information of the first component carrier, or DCI format 1A of the uplink scheduling information and DCI format1 of the downlink scheduling information of the second component carrier; since the DCIformat jointly encoded with the uplink and downlink scheduling information of the two component carriers is transmitted on the second downlink component carrier, therefore, the terminal detects the DCI format of the uplink scheduling information of the first component carrier and the uplink scheduling information of the second component carrier which are jointly coded and the DCI format of the downlink scheduling information of the first component carrier and the downlink scheduling information of the second component carrier which are jointly coded on the second downlink component carrier, or DCIformat obtained by jointly coding the uplink scheduling information of the first component carrier and the uplink scheduling information of the third component carrier, and DCIformat obtained by jointly coding the downlink scheduling information of the first component carrier and the downlink scheduling information of the third component carrier, or the DCI format jointly coded by the uplink scheduling information of the second component carrier and the uplink scheduling information of the third component carrier, and the DCI format jointly coded by the downlink scheduling information of the second component carrier and the downlink scheduling information of the third component carrier; since the DCI format jointly encoded by the uplink and downlink scheduling information of the three component carriers is transmitted on the third downlink component carrier, the terminal detects, on the third downlink component carrier, the uplink scheduling information of the first component carrier, the DCI format jointly encoded by the uplink scheduling information of the second component carrier and the uplink scheduling information of the third component carrier, and the DCI format jointly encoded by the downlink scheduling information of the first component carrier, the downlink scheduling information of the second component carrier and the downlink scheduling information of the third component carrier. The terminal also detects the common control information DCI format on the configured downlink component carrier.
If the uplink and downlink scheduling information of each component carrier is the same, the DCI format of the joint coding detected by the terminal on the second component carrier only contains one form.
The DCI format for the uplink and downlink scheduling information of the terminal transmitted on the second downlink component carrier may include a scheduling indication 011 indicating a corresponding component carrier scheduled by the DCI format, so that the terminal determines that the uplink and downlink scheduling information included in the DCI format for the uplink and downlink scheduling information of the terminal is directed to component carrier 1 and component carrier 2.
The DCI format for the uplink and downlink scheduling information of the terminal transmitted on the second downlink component carrier may further include a blind detection indicator 010 for indicating whether the DCI format for the uplink and downlink scheduling information of the terminal exists on the other downlink component carriers in the same subframe, and after the terminal detects the DCI format, it is determined that DCIformat for the uplink and downlink scheduling information of the terminal is not carried on the first downlink component carrier and the third downlink component carrier, so that the terminal stops performing DCIformat detection on the first downlink component carrier and the third downlink component carrier.
The network side can also inform the terminal of the CCE aggregation level and/or the search space length through high-layer signaling, so that the terminal can more efficiently detect the DCI format.
Detailed description of the invention
In this embodiment, in a specific implementation, the network side notifies the terminal of the transmission mode of each component carrier and the coding mode used when each downlink component carrier transmits the DCI format for the uplink and downlink scheduling information of the terminal. The specific treatment process comprises the following steps:
step 401: the network side also determines the coding mode of the DCI format of the uplink and downlink scheduling information of each component carrier on each component carrier configured to the terminal. Specifically, the network side determines DCI format of uplink and downlink scheduling information for transmitting a single component carrier on a first downlink component carrier, DCI format of uplink and downlink scheduling information joint coding for transmitting two component carriers on a second downlink component carrier, and DCI format of uplink and downlink scheduling information joint coding for transmitting three component carriers on a third downlink component carrier.
Step 402: the network side notifies the terminal of the transmission mode of each component carrier and the coding mode adopted when each downlink component carrier transmits the DCI format used for the uplink and downlink scheduling information of the terminal. Specifically, the network side notifies the terminal of the transmission mode of each component carrier, and also notifies the terminal of the coding mode of the DCI format of the uplink and downlink scheduling information of each component carrier determined in step 401 on each component carrier configured to the terminal, that is, the DCI format of the uplink and downlink scheduling information of a single component carrier transmitted on the first downlink component carrier, the DCI format of the uplink and downlink scheduling information joint coding of two component carriers transmitted on the second downlink component carrier, and the DCI format of the uplink and downlink scheduling information joint coding of three component carriers transmitted on the third downlink component carrier.
Step 403: the network side determines DCIformat of uplink and downlink scheduling information of a component carrier needing to be transmitted, determines downlink component carrier needing to transmit DCI format used for the uplink and downlink scheduling information of the terminal according to the DCI format needing to be transmitted, codes the DCI format of the uplink and downlink scheduling information of the component carrier needing to be transmitted according to the coding mode of the DCI format on the downlink component carrier to obtain the DCI format used for the uplink and downlink scheduling information of the terminal, and transmits the DCI format used for the uplink and downlink scheduling information of the terminal on the downlink component carrier. Specifically, the network side determines that what needs to be transmitted is DCI format1 of uplink scheduling information and DCI format 1A of downlink scheduling information of a first component carrier, DCI format 1A of uplink scheduling information and DCI format 1B of downlink scheduling information of a second component carrier, DCI format 1A of uplink scheduling information and DCI format 1D of downlink scheduling information of a third component carrier; since the DCI format of the uplink and downlink scheduling information of three component carriers needs to be transmitted, it may be determined that the dciformt for the uplink and downlink scheduling information of the terminal needs to be transmitted on the first component carrier and the second downlink component carrier, in this way, the network side transmits the DCI format for the uplink and downlink scheduling information of the terminal on the first component carrier and the second downlink component carrier, and the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the first component carrier is the uplink and downlink scheduling information of the second component carrier, and the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the second component carrier is the uplink scheduling information of the first component carrier and the uplink scheduling information of the third component carrier jointly encoded, that is, the DCI format1 for the uplink and downlink scheduling information of the terminal transmitted on the second component carrier and the DCI format for the downlink scheduling information of the terminal and the DCI format for the DCI format of the DCI transmitted on the third component carrier are DCI format1 and the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the second component carrier are jointly encoded The DCI format obtained after the format 1A is jointly coded and the DCI format obtained after the DCI format 1A and the DCI format 1D are jointly coded.
Step 404: and the terminal determines the uplink and downlink scheduling information of the first component carrier, the uplink and downlink scheduling information of the second component carrier and the uplink and downlink scheduling information of the third component carrier according to the transmission mode notified by the network side, and then performs corresponding DCI format detection on the configured downlink component carriers according to the corresponding coding mode and the DCI format of the uplink and downlink scheduling information of each component carrier determined according to the transmission mode. Specifically, since the DCI format of the uplink and downlink scheduling information of a single component carrier is transmitted on the first downlink component carrier, the terminal detects, on the first downlink component carrier, DCI format1 of the uplink scheduling information and DCI format 1A of the downlink scheduling information of the first component carrier, or DCI format 1A of the uplink scheduling information and DCI format 1A of the downlink scheduling information of the second component carrier, or DCI format 1A of the uplink scheduling information and DCI format 1D of the downlink scheduling information of the third component carrier; since the DCIformat jointly encoded with the uplink and downlink scheduling information of the two component carriers is transmitted on the second downlink component carrier, therefore, the terminal detects the DCI format of the uplink scheduling information of the first component carrier and the uplink scheduling information of the second component carrier which are jointly coded and the DCI format of the downlink scheduling information of the first component carrier and the downlink scheduling information of the second component carrier which are jointly coded on the second downlink component carrier, or DCIformat obtained by jointly coding the uplink scheduling information of the first component carrier and the uplink scheduling information of the third component carrier, and DCIformat obtained by jointly coding the downlink scheduling information of the first component carrier and the downlink scheduling information of the third component carrier, or the DCI format jointly coded by the uplink scheduling information of the second component carrier and the uplink scheduling information of the third component carrier, and the DCI format jointly coded by the downlink scheduling information of the second component carrier and the downlink scheduling information of the third component carrier; since the DCI format jointly encoded by the uplink and downlink scheduling information of the three component carriers is transmitted on the third downlink component carrier, the terminal detects, on the third downlink component carrier, the uplink scheduling information of the first component carrier, the DCI format jointly encoded by the uplink scheduling information of the second component carrier and the uplink scheduling information of the third component carrier, and the DCI format jointly encoded by the downlink scheduling information of the first component carrier, the downlink scheduling information of the second component carrier and the downlink scheduling information of the third component carrier. The terminal also detects the common control information DCI format on the configured downlink component carrier.
If the uplink and downlink scheduling information of each component carrier is the same, the DCI format of the joint coding detected by the terminal on the second component carrier only contains one form.
The DCI format for the uplink and downlink scheduling information of the terminal transmitted on the first downlink component carrier may include a scheduling indication 010 for indicating a corresponding component carrier scheduled by the DCI format, and the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the second downlink component carrier may include a scheduling indication 101 for indicating a corresponding component carrier scheduled by the DCI format, so that the terminal determines that the uplink and downlink scheduling information included in the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the first downlink component carrier is directed to the component carrier 2, and determines that the uplink and downlink scheduling information included in the DCI format for the uplink and downlink scheduling information of the terminal transmitted on the second downlink component carrier is directed to the component carrier 1 and the component carrier 3.
The DCI format for the uplink and downlink scheduling information of the terminal transmitted on the first downlink component carrier or the second downlink component carrier may further include a blind detection indication for indicating whether the DCI format for the uplink and downlink scheduling information of the terminal exists on the other downlink component carriers in the same subframe, where the blind detection indication may be a total number, and after the terminal detects the DCI format, the terminal compares the number of the detected DCI formats with the total number, and if the number of the detected DCI formats is less than the total number, it indicates that the DCI formats for the uplink and downlink scheduling information of the terminal are also carried on the other downlink component carriers; otherwise, it indicates that the rest downlink component carriers do not carry the DCI format for the uplink and downlink scheduling information of the terminal.
The network side can also inform the terminal of the CCE aggregation level and/or the search space length through high-layer signaling, so that the terminal can more efficiently detect the DCI format.
Based on the implementation in the second specific embodiment, DCI format for uplink and downlink scheduling information of a terminal may also be further transmitted on a third component carrier, where the DCI format for the uplink and downlink scheduling information of the terminal is DCI format jointly encoded by the uplink and downlink scheduling information of three component carriers. Of course, the DCI forrmat for the uplink and downlink scheduling information of the terminal may also be transmitted on the third component carrier alone.
Fig. 3 is a schematic structural diagram of a system for implementing downlink control information transmission in the present invention, and as shown in fig. 3, the system includes a network side and a terminal, the terminal is configured to transmit and receive data on n component carriers of a same subframe, wherein the network side is configured to transmit uplink and downlink scheduling information for the terminal on the downlink component carrier using a set corresponding DCI Format according to a component carrier index; the terminal is used for detecting the corresponding DCI Format on the downlink component carrier according to the component carrier index. The DCIformat for the uplink and downlink scheduling information of the terminal includes a subset of a DCI format set for the uplink and downlink scheduling information of the terminal, where the DCI format set includes: DCI format carrying uplink and downlink scheduling information for k component carriers, where k is 1, 2, 3.
The network side is further configured to determine a sending manner of the DCI format of the uplink and downlink scheduling information of each component carrier on each downlink component carrier configured to the terminal, and notify the terminal of the sending manner.
The specific implementation of the network side notifying the terminal of the sending mode may be: the method comprises the steps that a network side directly informs DCI (Downlink control information) formats of uplink and downlink scheduling information of each component carrier of a terminal and coding modes adopted when the DCI formats used for the uplink and downlink scheduling information of the terminal are transmitted by each downlink component carrier, and the network side is further used for determining the DCI formats of the uplink and downlink scheduling information of each component carrier; the terminal is configured to perform corresponding DCI format detection on the configured downlink component carriers according to the corresponding coding scheme and the DCI format of the uplink and downlink scheduling information of each component carrier notified by the network side.
The specific implementation of the network side notifying the terminal of the sending mode may also be: the network side informs the terminal of the transmission mode of each component carrier and the coding mode adopted when each downlink component carrier transmits DCIformat for the uplink and downlink scheduling information of the terminal; the terminal is used for determining the DCI format of the uplink and downlink scheduling information of each component carrier according to the transmission mode of each component carrier, and performing corresponding DCI format detection on the configured downlink component carrier according to the corresponding coding mode and the DCIformat of the uplink and downlink scheduling information of each component carrier determined according to the transmission mode.
The network side may be a base station.
Fig. 4 is a schematic structural diagram of an apparatus for implementing downlink control information transmission in the present invention, and as shown in fig. 4, the apparatus includes: the terminal is configured to transmit and receive data on n component carriers of the same subframe, wherein the coding unit is used for transmitting uplink and downlink scheduling information for the terminal on the downlink component carrier by using the set corresponding DCI Format according to the component carrier index; the sending unit is configured to transmit DCI format for uplink and downlink scheduling information of a terminal on a downlink component carrier. The DCI format for the uplink and downlink scheduling information of the terminal includes: a subset of a DCI format set for uplink and downlink scheduling information of a terminal, the DCI format set comprising: and a DCIformat carrying uplink and downlink scheduling information of k component carriers, where k is 1, 2, 3,. n, and n is the number of component carriers in the same subframe configured to the terminal.
The apparatus further comprises: the device comprises a determining unit and a notifying unit, wherein the determining unit is used for determining the sending mode of the DCI format of the uplink and downlink scheduling information of each component carrier on each downlink component carrier configured to the terminal; the notification unit is used for notifying the terminal of the sending mode.
The determining unit is further configured to determine the DCI format of the uplink and downlink scheduling information of each component carrier, where the sending scheme notified to the terminal by the notifying unit includes the DCI format of the uplink and downlink scheduling information of each component carrier, and the sending scheme further includes a coding scheme used when the DCI format of the uplink and downlink scheduling information of the terminal is transmitted by each downlink component carrier.
The determining unit is further configured to determine a transmission mode of each component carrier, where the sending scheme notified to the terminal by the notifying unit includes the transmission mode of each component carrier, and the sending scheme further includes a coding scheme used when each downlink component carrier transmits DCI format for uplink and downlink scheduling information of the terminal.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (11)
1. A method for transmitting Downlink Control Information (DCI), wherein a terminal is configured to transmit and receive data on at least one component carrier of the same subframe, the method comprising:
the network side transmits uplink and downlink scheduling information for the terminal on the downlink component carrier by using the set corresponding DCI Format according to the component carrier index;
and the terminal side detects the corresponding DCI Format on the downlink component carrier according to the component carrier index.
2. The method of claim 1, wherein the DCI format for uplink and downlink scheduling information of a terminal comprises: a subset of a DCI format set for uplink and downlink scheduling information of a terminal, the DCI format set comprising: DCI format carrying uplink and downlink scheduling information of k component carriers, where k is 1, 2, 3.. n, n is the number of component carriers in the same subframe configured to a terminal.
3. The method according to claim 1 or 2, wherein the DCI format corresponding to the mth component carrier carries kmUplink scheduling information and/or downlink scheduling information of each component carrier, wherein m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1mN or less, kmDetermined by the component carrier index.
4. The method of claim 3,
k ismDetermined by the component carrier index, further, kmM; or,
k ismOver time, further, km(i + m) mod n +1, i is the subframe number; or,
k ism＝1。
5. The method of claim 3, wherein the component carrier indices m and k aremThe corresponding relation of (a) is specified by network side signaling.
6. The method according to any one of claims 1 to 5, wherein the DCI format for the terminal uplink and downlink scheduling information comprises:
a scheduling indication indicating a corresponding component carrier scheduled by the DCI format; and/or the presence of a gas in the gas,
and the scheduling information is used for indicating the scheduling condition of the uplink and downlink scheduling information of the terminal on the other downlink component carriers in the same subframe.
7. The method of claim 6,
the scheduling indication information of the corresponding component carrier scheduled by the DCI format is p bits, wherein each bit corresponds to one component carrier, and the component carriers corresponding to the bits are different from each other;
the scheduling indication condition of the other downlink component carriers is represented by 1bit, and is used to represent whether the other downlink component carriers in the same subframe carry the DCIFormat for the uplink and downlink scheduling information of the terminal, or,
the scheduling conditions of the other downlink component carriers are represented by n-1 bits, wherein each bit corresponds to one component carrier in the other downlink component carriers, the component carriers corresponding to the bits are different from each other and are used for representing whether the corresponding downlink component carriers carry the DCIFormat for the uplink and downlink scheduling information of the terminal, or,
the scheduling condition of the other downlink component carriers is represented by q bits, and is used for representing that the component carrier bears the serial number of the DCI Format for the uplink and downlink scheduling information of the terminal in the same subframe, or,
and the scheduling conditions of the other downlink component carriers are represented by q bits and are used for representing the total number of the downlink component carriers of the DCI Format for bearing the uplink and downlink scheduling information of the terminal in the same subframe.
8. The method of any one of claims 1 to 5, further comprising: informing a terminal of a transmission mode on the component carrier.
9. The method according to any of claims 1 to 5, wherein a DCIformat of common control information is also transmitted on the downlink component carrier for transmitting the DCI format of the terminal uplink and downlink scheduling information.
10. A system for implementing DCI transmission, wherein a terminal is configured to transmit and receive data on at least one component carrier of a same subframe, the system comprising: a network side and a terminal, wherein,
the network side is used for transmitting uplink and downlink scheduling information for the terminal on the downlink component carrier by using the set corresponding DCI Format according to the component carrier index;
the terminal is configured to detect a corresponding DCIFormat on the downlink component carrier according to the component carrier index.
11. A DCI transmission apparatus in which a terminal is configured to transmit and receive data on at least one component carrier of the same subframe, the apparatus comprising: an encoding unit and a transmitting unit, wherein,
the coding unit is used for transmitting uplink and downlink scheduling information for the terminal on the downlink component carrier by using the set corresponding DCI Format according to the component carrier index;
the sending unit is configured to transmit DCIformat for uplink and downlink scheduling information of the terminal on a downlink component carrier.
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