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    • 专利摘要:
    METHOD FOR TRANSMITTING DOWNLINK CONTROL INFORMATION AND SYSTEM FOR TRANSMITTING DOWNLINK CONTROL INFORMATION The present invention discloses a method and a system for transmitting downlink control information, wherein when a base station is not configured with an indicator field of carrier, the base station transmits a physical downlink control channel that carries the corresponding downlink control information on each downlink component carrier in an equipment physical downlink shared channel (PDSCH) carrier set. user equipment, and the user equipment detects the corresponding downlink control information on each downlink component carrier in the configured PDSCH carrier set. When a base station is configured with a carrier indicator field, the base station transmits the physical downlink control channel that carries the corresponding downlink control information on each downlink component carrier in the channel channel carrier set. physical downlink control (PDCCH) is configured, and the user equipment detects the corresponding downlink control information on each carrier (...).
    公开号:BR112012010013B1
    申请号:R112012010013-0
    申请日:2010-06-30
    公开日:2021-05-11
    发明作者:Bo Dai；Weijun Li；Guanghui Yu；Zhisong Zuo
    申请人:Zte Corporation；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    The present invention relates to the field of wireless mobile communications and more especially to a method and system for transmitting downlink control information in a wireless communication system. BACKGROUND OF RELATED TECHNIQUE
    Radio Frames in the Long Term Evolution (LTE) system include Frequency Division Duplex (FDD) mode and Time Division Duplex (TDD) mode frame structures.
    The frame structure of FDD mode is shown in Figure 1, a 10ms radio frame is composed of 20 0.5ms intervals which are numbered as 0~19, and the 2i and 2i+1 intervals comprise subframe i of 1 ms.
    The TDD mode frame structure is shown in Figure 2, a 10 ms radio frame is composed of 25 ms half frames, a half frame comprises 5 1 ms subframes, and the i subframe is defined as two 0 slots .5 ms 2i and 2i + 1.
    In the above two frame structures, for the standard Normal Cyclic Prefix (Normal CP), a range contains 7 symbols of 66.7 us, where the CP length of the first symbol is 5.21 us, and the length of the 6 symbols remaining is 4.69 µs; for the Extended Cyclic Prefix (Extended CP), a range contains 6 symbols, and the CP length of all symbols is 16.67 us.
    The LTE system also defines the following three types of downlink physical control channels: the Physical Control Format Indicator Channel (PCFICH); the Physical Hybrid Automatic Retransmission Request Indicator Channel (PHICH); the Physical Downlink Control Channel (PDCCH), wherein: (1) the information originating in the PCFICH is used to indicate the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols to transmit the PDCCH in a subframe, the they are transmitted in the first OFDM symbol of the subframe, and all frequency locations are determined according to cell identity and downlink bandwidth (ID). (2) PHICH is used to carry the Acknowledgment/Negative Acknowledgment (ACK/NACK) feedback information of the uplink transmission data. The number of PHICHs and the time frequency locations are determined by system messages and cell ID on the Physical Broadcast Channel (PBCH) of the downlink carrier on which the PHICH is located. (3) PDCCH is used to carry Downlink Control Information (DCI), which includes: uplink and downlink planning information, as well as uplink power control information. The PDCCH DCI format (format) is divided into: DCI format 0, DCI format 1, DCI IA format, DCI 1B format, DCI 1C format, DCI 1D format, DCI 2 format, DCI 2A format, DCI 3 format, and format DCI 3A, and so on; on what:
    DCI format 0 is used to indicate the Physical Uplink Shared Channel (PUSCH) schedule;
    DCI 1 format, DCI IA format, DCI 1B format, DCI 1C format and DCI 1D format are used to indicate different modes of a PDSCH codeword schedule;
    DCI 2 format and DCI 2A format are used to indicate different modes of space division multiplexing;
    DCI 3 format and DCI 3A format are used to indicate different modes of Physical Uplink Control Channel 5 (PUCCH) and PUSCH power control instructions.
    The PDCCH search space is divided into a common search space and a UE-specific search space, and the common search space is the space in which all UEs need to search, and the UE-specific search space 10 is specific search space for a UE. Both the common search space and the UE-specific search space correspond to respective DCI formats. The UE respectively detects the corresponding downlink control information in the common search space 15 and the UE-specific search space according to the corresponding DCI formats.
    The PDCCH corresponds to four levels which are also known as four PDCCH formats, corresponding respectively to 1 Control Channel Element (CCE), 2 20 CCEs, 4 CCEs and 8 CCEs.
    The LTE protocol whose version corresponds to Release (R) 8 defines its bandwidth types as follows: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. (Additional Advances for E-UTRA) is the - 25 evolved version of LTE Release-8. ITE-Advanced must also meet or exceed the IMT-Advanced requirements proposed by the International Telecommunications Union (ITU-R) in addition to meeting or exceeding 3rd Generation Partnership Project (3GPP) TR 25.913: "Requirements for Radio Access of 30 Evolved Universal Telecommunication (Evolved UTRA) and Evolved Universal Telecommunication Radio Access Network (Evolved UTRAN)".
    The requirements of backwards compatibility with the
    LTE Launch-8 refer to: LTE Launch-8 terminal can work on LTE-Advanced network; LTE-Advanced terminal can work on LTE Launch-8 network.
    In addition, LTE-Advanced must work in different size spectrum configurations, including working in spectrum configuration (such as the 10 0 MHz continuous spectrum features) wider than LTE Release-8 in order to achieve higher performances and target peak rates. Taking into account the compatibility with LTE Release-8, for a bandwidth greater than 20 MHz, the way of carrier aggregation is used, namely: • two or more component carriers are aggregated to support the bandwidth of downlink transmission greater than 20 MHz; and • the terminal can receive one or more component carriers at the same time according to its capacity.
    The LTE-A terminal with a receive capability with bandwidth greater than 20 MHz is capable of simultaneously receiving transmission on a plurality of carrier components. The LTE Release 8 terminal can only receive transmission on a component carrier, and the structure of the component carrier follows the Release 8 specification.
    At present, the transmission of downlink control signaling, which is the form of the physical downlink control channel (PDCCH), in the LTE-Advanced standard has the following conclusions:
    Define a specified Downlink Component Carrier Set of User Equipment (UE) used to transmit the planned Physical Downlink Shared Channel (PDSCH) to the target UE, and the carrier set is notified with a special signal.
    The backward compatible carrier can allow UEs access to all existing LTE versions and can operate in single (stand-alone) carrier form or act as a part of spectrum aggregation. For FDD, backwards compatibility carriers always appear in pairs, that is, downlink (DL) and uplink (UL).
    The non-backward compatible carrier can be defined to allow access of the UE of the LTE version of such type of carriers if defined, but it cannot allow the access of the UE of the LTE version R8. If the mismatch is derived from the frequency multiplexing distance, the non-retroactively compatible carrier operates in the form of a single (stand-alone) carrier, or acts as a part of spectrum aggregation. • S Extended Carrier: cannot operate in single carrier form if defined, but must be a composite part of a carrier group, and at least one carrier in the carrier group is capable of operating in single carrier (stand-alone) form .
    The PDCCHs on a component carrier indicate the PDSCH resources of the same component carrier and the PUSCH resources of only one connected uplink component carrier. • There is no carrier indicator field in DCI format • that is, PDCCH structure (same encoding and CCE-based resource mapping) and DCI formats in Release 8.
    PDCCHs on a component carrier use the carrier indicator field to indicate the PDSCH or PUSCH resources of a component carrier on multiple component carriers. • Extended 1 to 3 bit Carrier Indicator (CI) field in DCI formats in Release 8 • reuses Release 8 PDCCH structure (same encoding and CCE-based resource mapping). • It is necessary to study the solution of the PCFICH detection error of the component carrier that carries the PDSCH • The existence of the carrier indicator field (Cl) is configured semi-statically.
    When extended carrier scheduling is enabled, since each carrier can correspond to different DCI format types, the UE needs to perform large amount of blind detection on the downlink component carrier to be detected to determine the transmission condition of downlink control information configured by the base station, which increases deployment complexity and results in system performance degradation. Furthermore, due to the introduction of cross-carrier scheduling, this means that downlink control information configured by the base station can be centered on one or more downlink component carriers in the set of downlink component carriers specific to UE to be transmitted.
    Due to the introduction of cross-carrier planning and carrier aggregation, there are problems where the number of blinds will increase and how to transmit and detect the multi-carrier downlink control information, and others. SUMMARY OF THE INVENTION
    The technical problem to be solved in the present invention is to provide a method and a system for transmitting downlink control information for the purpose of deploying to transmit and detect the downlink control information on multiple carriers, and to overcome the defect that the number of blind detections increases.
    In order to solve the aforementioned problem, the present invention provides a method for transmitting downlink control information, comprising: when a base station is not configured with a carrier indicator field, the base station transmits a link control channel physical downlink which carries corresponding downlink control information on each downlink component carrier in a set of physical user equipment downlink shared channel carrier (UE), and a UE detects the downlink control information corresponding to each downlink component carrier in the physical downlink shared channel carrier set, wherein the physical downlink shared channel carrier set is configured by the base station.
    The method further comprises: when the base station is configured with a carrier indicator field, the base station transmits a physical downlink control channel that carries the corresponding downlink control information on each downlink component carrier in a a configured physical downlink shared channel carrier set, and the UE detects the corresponding downlink control information on each downlink component carrier in a physical downlink control channel carrier set, wherein the set of physical downlink control channel carrier is configured by the base station.
    The physical downlink control channel carrier set is a subset of backward compatible carriers and non-backward compatible carriers in a set of UE-specific downlink component carriers; or
    the physical downlink control channel carrier set is divided into a UE-specific downlink control information carrier set and a public downlink control information carrier set to respectively indicate the downlink component carriers the UE-specific downlink control information and the public downlink control information that the UE needs to detect.
    When the base station is configured with a carrier indicator field, in the step of the base station transmitting the physical downlink control channel that carries the corresponding downlink control information on each downlink component carrier in the carrier set of configured physical downlink control channel, the base station transmits corresponding downlink control information on each downlink component carrier in the configured physical downlink control channel carrier set; in the step of the user equipment detecting the corresponding downlink control information in each downlink component carrier in the physical downlink control channel carrier set, the UE detects the corresponding downlink control information in a common search space and the UE-specific search space of each downlink component carrier in the configured physical downlink control channel carrier set.
    Preferably, in the step where the UE detects the corresponding downlink control information in each downlink component carrier in the physical downlink shared channel carrier set, the UE detects the corresponding downlink control information in the common search space of backwards compatible carriers and non-backwards compatible carriers in the physical downlink shared channel carrier set.
    In the step where the base station transmits the physical downlink control channel that carries the corresponding downlink control information, if the downlink component carrier is performed by cross-carrier scheduling, the component carrier is configured through adopting a component carrier as a unit in cross-carrier planning.
    For the cross-carrier planned downlink component carrier, the downlink component carrier common search space downlink control information format does not contain a carrier indicator field and only indicates the carrier scheduling information of downlink component, and the format of the downlink control information of the UE-specific search space of the downlink component carrier contains the carrier indicator field; or for the cross-carrier planned downlink component carrier, the downlink component carrier common search space does not carry said format of the UE-specific downlink control information; the downlink control message format of the UE-specific search space of the downlink component carrier contains the carrier indicator field.
    In the step where the UE detects the downlink control information, a search space of each downlink component carrier is determined by a search space method in a Long Term Evolution Release 8 (LTE R8) pattern; alternatively, if the UE is an LTE RIO standard UE, the search space in each downlink component carrier of the LTE RIO standard UE is determined according to an index of the downlink component carrier.
    The format of the corresponding downlink control information in a downlink component carrier to be detected is notified to the UE by the base station using higher layer signaling; or
    The format of the downlink control information is divided into a plurality of different format groups of the downlink control information according to one group, and the step of dividing into the plurality of different format groups of the downlink control information downlink according to group comprises: dividing all formats of the downlink control information into different bandwidths and transmission modes into a plurality of format groups of downlink control information with different overloads according to the overloads , in which each format group of the downlink control information includes different numbers of information bits.
    The downlink control information format group includes the following signaling: a downlink control information format type bit, and a padding bit and a padding bit in the downlink control information format, where the number of padding bits is 0 or a positive integer, where the downlink control information format type bit is used to indicate the format type of the downlink control information; all formats of downlink control information in the format group of downlink control information achieve the same overhead by padding bits.
    In the step of the base station that transmits the physical downlink control channel that carries the downlink control information and the UE detects the downlink control information, the base station transmits the downlink control information in accordance with the downlink control information format group filled with padding bits; the UE detects the received downlink control information according to the downlink control information format group filled with padding bits.
    In the step of all formats of downlink control information in the downlink control information format group that achieves the same overhead by padding bits, when the physical downlink control channel on a link component carrier downlink carries the downlink control information from a plurality of downlink carriers, and the resource in the downlink control information format uses a type 2 resource representation method, in which the overload of a format of the control information downlink with a small bandwidth is constituted to equal the overhead of the format of the downlink control information with a large bandwidth by padding padding bits; or when the physical downlink control channel on a downlink component carrier carries the downlink control information of a plurality of downlink carriers and the resource in the downlink control information format uses a method of resource representation type 0 or type 1, the overhead of a format of the downlink control information with a large bandwidth is constituted to be equal to the format overhead of the downlink control information with a small bandwidth through compressing the bits in the downlink control information with large bandwidth; or the overhead of a downlink control information format with large bandwidth is made to be equal to the format overhead of downlink control information with a small bandwidth filled with padding bits through compression of the bits in the downlink control information with large bandwidth.
    The present invention further provides a system for transmitting downlink control information, comprising a base station and user equipment, wherein the base station is configured to transmit a physical downlink control channel that carries control information. corresponding downlink on each downlink component carrier in a set of user equipment physical downlink shared channel carriers when not configured with a carrier indicator field; the user equipment is configured to detect the corresponding downlink control information on each downlink component carrier in the physical downlink shared channel carrier set.
    The base station is further configured to transmit the physical downlink control channel that carries the corresponding downlink control information on each downlink component carrier in the configured physical downlink shared channel carrier set when configured with a carrier indicator field; said UE is also configured to detect corresponding downlink control information on each downlink component carrier in a set of physical downlink control channel carriers.
    The base station is configured to divide all formats of the downlink control information in different bandwidths and transmission modes into a plurality of format groups of the downlink control information with different overloads according to overloads, where various format groups of downlink control information contain different numbers of bits of information.
    The base station is configured to transmit corresponding downlink control information on each downlink component carrier in the configured physical downlink control channel carrier set when configured with the carrier indicator field; said UE is configured to detect corresponding downlink control information in a common search space and a UE-specific search space of each downlink component carrier in the configured physical downlink control channel carrier set ; and/or detecting the corresponding downlink control information in the common search space of backward compatible carriers and non-backward compatible carriers in the physical downlink shared channel carrier set.
    The method and system for transmitting downlink control information according to the present invention solves the problems where the number of blind detections increases due to the introduction of cross-carrier planning and carrier aggregation and how to transmit and detect the information of downlink control of multiple carriers and others, and, thus, are occasioned the implementation of LTE-Advanced systems. BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 is a schematic diagram of the frame structure of the FDD mode in the prior art;
    Figure 2 is a schematic diagram of the frame structure of the TDD mode in the prior art;
    Figure 3 is a schematic deployment diagram for transmitting downlink control information in accordance with the present invention. PREFERRED MODALITIES OF THE PRESENT INVENTION
    To make the objectives, technical schemes and benefits of the present invention clearer, the present invention will be further described in detail below with combination of the attached drawings.
    Under the condition that the number of blind detections increases due to the introduction of cross-carrier planning and carrier aggregation in the LTE-Advanced system and there is no technical scheme to transmit and detect the multiple downlink control information carriers, the present invention provides a method and system for transmitting downlink control information to implement the transmission and detection of the downlink control information of multiple carriers.
    As shown in Figure 3, in the method for transmitting downlink control information according to the present invention, the total procedure to achieve transmission and detection of the downlink control information is as follows: when the base station is not configured with a carrier indicator field, the base station transmits a physical downlink control channel that carries the corresponding downlink control information on each carrier in the UE physical downlink shared channel carrier set (the set of UE-specific downlink component carrier), and a user equipment detects the corresponding downlink control information on each downlink component carrier in the downlink component carrier set, wherein the downlink component carrier set physical downlink shared channel is configured by station b ase.
    Preferably, when the base station is configured with a carrier indicator field, the base station transmits the corresponding downlink control information on each downlink component carrier in the configured PDCCH carrier set, and the UE only detects the corresponding downlink control information on each downlink component carrier in the configured PDCCH carrier set.
    Preferably, when the base station is configured with a carrier indicator field, the base station transmits the corresponding downlink control information on each downlink component carrier in the configured PDCCH carrier set, and the UE detects from the information. downlink control keys in the common search space and the UE-specific search space of each downlink component carrier in the configured PDCCH carrier set; and detects the corresponding downlink control information in the common search space from the backwards compatible carriers and the non-backwards compatible carriers in the PDSCH carrier set.
    Preferably, the physical downlink control channel carrier set is a subset of backward compatible carriers and non-backward compatible carriers in the UE-specific downlink component carrier set.
    Preferably, the physical downlink control channel carrier set is divided into UE-specific DCI carrier set and public DCI carrier set to respectively indicate the downlink component carriers of the UE-specific DCI and the Public DCI that the UE needs to detect.
    Preferably, the cross-carrier scheduling is configured by adopting the component carrier as the unit, that is, the cross-carrier planned downlink component carrier and the cross-carrier unplanned downlink component carrier can coexist .
    Preferably, for the downlink component carrier that can be performed by cross-carrier scheduling, the UE-specific DCI format of its common search space does not contain a carrier indicator field and only indicates the scheduling information for that carrier, alternatively, for the downlink component carrier that can be performed by cross-carrier scheduling, the common search space of that downlink component carrier does not carry the UE-specific DCI format.
    Preferably, for the downlink component carrier that can be performed by cross-carrier scheduling, the DCI format of its UE-specific search space includes the carrier indicator field.
    Preferably, the corresponding DCI format on the downlink component carrier to be detected is notified by upper layer signaling, such as with the use of radio resource control RCC signaling notification.
    Preferably, the search space of each downlink component carrier is determined by the search space method in LTE R8; alternatively, the search space in each downlink component carrier of the UE RIO can be determined according to the index of the downlink component carrier.
    Preferably, UE search space RIO may be different from UE search space R8.
    The base station configured with the carrier indicator field is equivalent to the base station that allows the target UE to perform cross-carrier scheduling, and the base station not configured with the carrier indicator field is equivalent to the base station that does not allow the Target UE perform cross-carrier planning.
    Carrier indicator domain configuration (cross carrier scheduling configuration) is a UE-specific configuration, that is, the carrier indicator field configurations of different UEs can be different.
    In order to reduce the number of blind detections and reduce deployment complexity, the present invention provides the following ways of processing for downlink control information formats.
    All formats of downlink control information (DCI format) in different bandwidths and transmission modes are divided into k different DCI format groups according to overhead (the number of bits of information contained in the DCI format), and the numbers of information bits contained in various DCI format groups are different.
    Preferably, all DCI formats in a DCI format group are padded with padding bits to achieve the same overhead according to the fixed overhead, and padding bits are used to make all DCI formats in the group have the same overhead.
    Preferably, the signal contained in the DCI format group is the DCI format type bits, and the pad bits and bits in the DCI format, where the pad bits are 0 or positive integers, and the type bit DCI format represents the DCI format type. Preferably, the base station transmits downlink control information in accordance with the DCI format group filled with padding bits, and the UE performs detection according to the DCI format group filled with padding bits; during transmission, the way to determine the carrier can refer to the description of carrier selection, and the group and carrier determination relationship can be determined with a blind detection way.
    Preferably, when the PDCCH on a downlink carrier can carry the downlink control information of a plurality of downlink carriers and the resource in DCI format indicates that the signaling (bits contained in DCI format) uses the method Of resource type 2 representation, the DCI format with a small bandwidth is padded with padding bits to make the overhead of this consistent with that of the DCI format with a large bandwidth.
    Preferably, when the PDCCH on a downlink carrier can carry the downlink control information of a plurality of downlink carriers and the resource in DCI format indicates that the signaling (bits contained in the DCI format) uses the resource representation method type 0/1, the DCI format bit with a large bandwidth is compressed to make the overhead of this equal to that of the DCI format with a small bandwidth, or, the format bit DCI with a large bandwidth is compressed to make the overhead of this equal to the DCI format with a small bandwidth filled with padding bits.
    Based on the above transmission method shown in Figure 3, the present invention also provides a system for transmitting downlink control information, and the system comprises a base station and user equipment, wherein the base station is configured to transmit the physical downlink control channel carrying the corresponding downlink control information on each carrier in the UE physical downlink shared channel carrier set; the UE is configured to detect the corresponding downlink control information on each downlink component carrier in the physical downlink shared channel carrier set.
    Preferably, the base station is also configured to transmit the physical downlink control channel carrying the corresponding downlink control information on each downlink component carrier in the configured physical downlink control channel carrier set when configuring with a carrier indicator field; correspondingly, said UE is also configured to detect corresponding downlink control information on each downlink component carrier in the physical downlink control channel carrier set.
    The formats of the downlink control information are divided into a plurality of different format groups of the downlink control information according to the group, and the specific division method is as follows.
    All formats of the downlink control information in different bandwidths and transmission modes are divided into a plurality of different format groups of the downlink control information with different overloads according to the overload, and each format group of the downlink control information contains different numbers of bits of information.
    When the base station is configured with the carrier indicator field, it transmits the corresponding downlink control information on each downlink component carrier in the configured physical downlink control channel carrier set; said UE detects corresponding downlink control information in the common search space and UE-specific search space of each downlink component carrier in the configured physical downlink control channel carrier set; the UE also detects the corresponding downlink control information in the common search space from the backwards compatible carriers and the non-backwards compatible carriers in the physical downlink shared channel carrier set. MODE 1
    When the base station is not configured with a carrier indicator field, the base station transmits a physical downlink control channel that carries the corresponding downlink control information on each carrier in a downlink shared channel carrier set physical user equipment (the UE-specific downlink component carrier set), and the UE detects the corresponding downlink control information in each downlink component carrier in the aforementioned downlink component carrier set. ; when the base station is configured with a carrier indicator field, the base station transmits the corresponding downlink control information on each downlink component carrier in the configured PDCCH carrier set, and the UE only detects the control information of corresponding downlink components on each downlink component carrier in the configured PDCCH carrier set; wherein the PDSCH bearer set and the PDCCH bearer set are configured by the base station.
    The PDCCH carrier set is a subset of backward compatible carriers and non-backward compatible carriers in the UE-specific downlink component carrier set; the corresponding DCI format on the downlink component carrier to be detected is notified by higher layer signaling, such as RCC signaling.
    Cross-carrier scheduling is configured by adopting the component carrier as the unit, that is, the cross-carrier planned downlink component carrier and the cross-carrier unplanned downlink component carrier can coexist. MODE 2
    When the base station is not configured with a carrier indicator field, the base station transmits a physical downlink control channel that carries the corresponding downlink control information on each carrier in the physical downlink shared channel carrier set the UE (the UE-specific downlink component carrier set), and the UE detects the corresponding downlink control information in each downlink component carrier in the physical downlink component carrier set; when the base station is configured with a carrier indicator field, the base station transmits corresponding downlink control information on each downlink component carrier in the configured PDCCH carrier set; the UE detects the corresponding downlink control information in the common search space and the UE-specific search space of each downlink component carrier in the configured PDCCH carrier set, and detects the corresponding downlink control information in the common search space of the backwards compatible carriers and the non-backwards compatible carriers in the PDSCH carrier set; in the present context, this indicates that when the base station is configured with the carrier indicator field, the PDCCH carrier set only defines the UE-specific DCI downlink component carrier set that is transmitted in the search space EU specific; the PDSCH carrier set defines the public DCI downlink component carrier set that is transmitted in the common search space.
    The PDSCH bearer set and the PDCCH bearer set are configured by the base station; the PDCCH carrier set is a subset of the backward compatible carriers and the non-backward compatible carriers in the UE-specific downlink component carrier set.
    The corresponding DCI format on the downlink component carrier to be detected is notified to the UE by upper layer signaling by the base station, such as being configured with RCC signaling.
    Cross-carrier scheduling is configured by adopting the component carrier as the unit, that is, the cross-carrier planned downlink component carrier and the cross-carrier unplanned downlink component carrier can coexist. MODE 3
    The PDCCH bearer set is divided into UE-specific DCI bearer set and public DCI bearer set to represent the downlink component carriers of the UE-specific downlink control information and the UE-specific downlink control information respectively. public downlink that the user equipment needs to detect.
    When the base station is not configured with the carrier indicator field, the base station transmits the PDCCH that carries the corresponding DCI on each carrier in the UE PDSCH carrier set (UE-specific downlink component carrier set), and the UE detects the corresponding downlink control information on each downlink component carrier in the set of downlink component carriers.
    When the base station is configured with the carrier indicator field, the base station transmits the corresponding DCI on each downlink component carrier in the configured PDCCH carrier set, and the UE detects the corresponding UE-specific DCI in the search space specific data of each downlink component carrier in the configured UE-specific DCI carrier set, and the UE detects the corresponding public DCI in the common search space of each downlink component carrier in the public DCI carrier set configured.
    The cross-carrier scheduling is configured by adopting the component carrier as the unit, that is, the cross-carrier planned downlink component carrier and the cross-carrier unplanned downlink component carrier can coexist. MODE 4
    The search space on each downlink component carrier is determined with the LTE R8 search space method; or,
    for UE RIO, the search space on each downlink component carrier can be determined according to the index of the downlink component carrier.
    For the cross-carrier planned downlink component carrier, the UE-specific DCI format of its common search space does not contain the carrier indicator field and only indicates the planning information of that carrier, alternatively, the common search space of the downlink component carrier does not carry the UE-specific DCI format.
    For the cross-carrier scheduled downlink component carrier, the DCI format of its UE-specific search space contains the carrier indicator field to indicate the scheduling information of other downlink component carriers to perform carrier scheduling crusade. MODE 5
    UE RIO search space may be different from UE R8 search space.
    In the common search space, LTE R8 detects PDCCH formats with four CCEs 4 times and PDCCH formats with 8 CCEs twice. In the UE-specific search space, PDCCH formats with one CCE are detected 6 times, PDCCH formats with 2 CCEs are detected 6 times, PDCCH formats with four CCEs are detected twice, and PDCCH formats with 8 CCEs are detected twice.
    For UE RIO, the search space on the downlink component carrier to be detected can be further extended. In the common search space, PDCCH formats with 4 CCEs are detected (4+kl) times, PDCCH formats with 8 CCEs are detected (2+k2) times. In the UE-specific search space, PDCCH formats with one CCE are detected (6+k3) times, PDCCH formats with two CCEs are detected (6+k4) times, PDCCH formats with four CCEs are detected ( 2+k5) times, and PDCCH formats with 8 CCEs are detected (2+k6) times, where the values of kl, k2, k3, k4, k5 and k6 are positive integers or 0.
    The values of k1, k2, k3, k4, k5, and k6 of the cross-carrier planned downlink component carrier and the cross-carrier unplanned downlink component carrier may be different. MODALITY 6
    All DCI formats in different bandwidths and transmission modes are divided into k different DCI format groups according to overhead (the number of bits of information contained in the DCI format), and the numbers of bits of information contained in various DCI format groups are different; where DCI formats can be divided into groups first and then the number of padding bits can be determined according to the amount of overhead in the group.
    All DCI formats in a DCI format group are padded with padding bits according to fixed overhead to achieve the same overhead.
    Different DCI formats in the same DCI format group are distinguished through public signaling in the DCI format group.
    The base station transmits the DCI in accordance with the DCI format group filled with the padding bits, and the UE performs detection according to the DCI format group filled with the padding bits.
    The signal contained in the DCI format group is the DCI format type bits, and the padding bits and bits in the DCI format, where the padding bits are 0 or positive integers. MODALITY 7
    When the PDCCH on a downlink carrier can carry the downlink control information of a plurality of downlink carriers, the resource in DCI format indicates that the signaling uses the resource type 2 representation method, and the bits of padding the DCI format with a small bandwidth makes the overhead of the DCI format with a small bandwidth consistent with that of the DCI format with a large bandwidth.
    When the PDCCH on a downlink carrier can carry the downlink control information of a plurality of downlink carriers, and the resource in DCI format indicates that the signaling uses the resource representation method type 0/1, and the DCI format bit with a large bandwidth is compressed to make the overhead of this equal to that of the DCI format with a small bandwidth. Or, when the PDCCH on a downlink carrier can carry the downlink control information of a plurality of downlink carriers, the resource in DCI format indicates that the signaling uses the resource type 0/1 representation method, and the DCI format bit with a large bandwidth is compressed to make the overhead of this equal to that of the DCI format with a small bandwidth.
    The large bandwidth is divided into k blocks according to the size of the small bandwidth and then the flag is used to indicate the selected block index and then the flag is used to indicate the resource allocation within of the block.
    It should be noted that the format of the UE-specific downlink control information of the downlink component carrier common search space mentioned in the aforementioned embodiment is: the downlink component carrier format detected by the UE in the common lookup for the downlink component carrier.
    A common skill element in the art is to understand that all or parts of the steps in the aforementioned method can be implemented with programs that instruct the relevant hardware, and the programs can be stored on computer-readable storage media such as a Read-Only Memory , a magnetic disk or an optical disk and others. Optionally, all or parts of the steps of the aforementioned modality can be implemented with one or more integrated circuits. Correspondingly, each module/unit in the aforementioned modality can be implemented with hardware or software function module. The present invention is not intended to limit the combination of any specific form of hardware and software.
    The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention and for those skilled in the art, the present invention has a variety of modifications and variations. Without departing from the spirit and essence of the present invention, all such types of modifications, equivalences or variations shall fall within the scope of the claims of the present invention. INDUSTRIAL APPLICABILITY
    By transmitting or detecting the downlink control information on the downlink component carrier in the PDSCH or PDCCH carrier sets, the method and system for transmitting downlink control information according to the present invention solves the problems in that the number of blind detections increases due to the introduction of cross-carrier planning and carrier aggregation and how to transmit and detect the downlink control information of multiple carriers and others, and thus lead to the deployment of the LTE system -Advanced.
    权利要求:
    Claims (6)
    [0001]
    1. METHOD FOR TRANSMITTING DCI DOWNLINK CONTROL INFORMATION, characterized by comprising: a base station configuring a physical downlink shared channel carrier PDCCH to user equipment UE; when the base station determines that it is not configured with a carrier indicator field, the base station transmits a physical downlink control channel PDCCH on each downlink component carrier on the PDSCH carrier, the PDCCH of the corresponding DCI ports, and the UE detects corresponding DCIs on each downlink component carrier in the set of PDSCH carriers; said method comprising: a base station configuring a physical downlink control carrier set PDCCH for user equipment UE, wherein the PDCCH set is divided into a specific UE of the DCI set and a set of DCI respectively indicates a downlink component carrier DCI of the specific UE and public DCI that the UE needs to detect; when the base station determines that it is configured with an indicator field, the base station transmits a physical PDCCH downlink control channel that the DCI port on each downlink component carrier in the specific UE divided PDCCH carrier set and DCI set and the public DCI set, and the corresponding UE detects the UE-specific DCI in the UE-specific search space of each downlink component carrier in the UE-specific DCI set, and UE detects the UE-specific corresponding to DCI public in the common search space on each component carrier in the public DCI pool.
    [0002]
    2. The method according to claim 1, characterized in that the PDCCH set is a subset of backward compatible carriers and non-backward compatible carriers in a set of UE-specific downlink component carriers.
    [0003]
    3. METHOD according to claim 1, characterized in that in the step that the base station transmits the PDCCH which corresponding DCI port, if planned downlink component carrier is performed by cross-carrier planning, the component carrier is configured through the adoption of a component carrier as a unit in cross-carrier planning.
    [0004]
    4. The method according to claim 3, characterized in that for a cross-carrier planned downlink component carrier, the downlink DCI format of the planned downlink component carrier common search space does not contain an indicator field. carrier and only indicates the downlink component carrier planning information, and the downlink component carrier UE-specific lookup space Downlink DCI format contains the carrier indicator field; or for a cross-carrier planned downlink component carrier, the planned downlink component carrier common search space does not carry a DCI format; the UE-specific search space DCI format of the planned downlink component carrier contains the carrier indicator field.
    [0005]
    The method according to claim 1, characterized in that in the step the corresponding UE detects the UE-specific DCI in the UE-specific search space of each downlink component carrier in the UE-specific DCI set, and UE detects the UE specific corresponds to public DCI in common search space on each component carrier in the public DCI set, a search space of each downlink component carrier is determined by a search space method in a pattern Long Term Evolution Release 8 (LTE R8); alternatively, if the UE is a UE of LTE R10 standard, the search space in each downlink component carrier of the UE of LTE R10 standard is determined according to an index of the downlink component carrier.
    [0006]
    6. SYSTEM FOR TRANSMITTING DCI DOWNLINK CONTROL INFORMATION, characterized in that it comprises a base station and a user equipment UE, wherein, the base station is configured to configure a physical downlink shared channel carrier set PDSCH for the HUH; when the base station determines that it is not configured with a carrier indicator field, the base station transmits a physical downlink control channel PDCCH on each downlink component carrier in the PDCCH carrier set, the PDCCH carrying corresponding DCI information ; the UE is configured to detect the corresponding DCI on each downlink component carrier in the PDCCH carrier set; said comprises the base station which is configured to: configure a set of physical downlink shared channel carrier PDSCH for the UE, wherein the PDCCH set is divided into a set of UE specific DCI and public DCI that the UE needs to detect: when the base station is configured with a carrier indicator field, it transmits a physical PDCCH downlink control channel that carries the corresponding DCI information on each downlink component carrier in the PDCCH set divided into specific DCI UE set and the set of DCI, and the UE is configured to detect the corresponding UE-specific DCI in a UE-specific search space of each downlink component carrier in the UE-specific DCI set and detect corresponding public DCIs in a common search space of each downlink component bears the set of public DCIs.
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    同族专利:
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    CN101714892B|2014-12-31|
    RU2012119775A|2013-12-10|
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    法律状态:
    2019-12-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-21| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04B 7/26 Ipc: H04L 5/00 (2006.01), H04W 48/08 (2009.01), H04W 88 |
    2020-01-21| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-30| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-11| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 11/05/2021, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    CN200910176098.5A|CN101714892B|2009-11-02|2009-11-02|Method and system for transmitting downlink control information|
    CN200910176098.5|2009-11-02|
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