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    • 专利摘要:
    METHOD, DEVICE, AND SYSTEM FOR THE CONFIGURATION OF CODE BOOKS. The present invention relates to a method, device and system for the configuration of free codes. The method comprises a transmit terminal which selects a restricted subset of codewords and informs a receiving terminal about the restricted subset of codewords, the restricted subset of codewords containing part or all of the words of code in a first codebook and/or a second codebook; and the receiving terminal selects an ideal precoded codeword from the restricted subset of codewords and informs the transmitting terminal about an index of the ideal precoded codeword. By the present invention, the restriction of codewords in the case of dual codebooks in the LTE-A system is implemented, such that the complexity in the calculation is reduced when the receiving terminal selects the codeword, the instances in which the receiving terminal selects the codeword wrongly are reduced, and the signaling structure in LTE system can be fine (...).
    公开号:BR112012022728B1
    申请号:R112012022728-9
    申请日:2010-12-27
    公开日:2021-05-11
    发明作者:Hui Yu；Yijian Chen；Yu Ngok Li；Jun Xu
    申请人:Zte Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    The present invention relates to the field of wireless communications and particularly to a method, device and system for configuring codebooks. TECHNICAL BACKGROUND
    In a wireless communication system, several antennas are used at both the transmit and receive terminals, in order to obtain a higher rate, through spatial multiplexing. Since the receiving terminal can obtain a matrix of channels through which the transmitted signals pass, by means of channel estimation, even if each antenna transmits different data, the receiving terminal can still analyze the data transmitted on each antenna , which has passed through the Multiple Input and Multiple Output (MIMO) channel matrix.
    Compared to a method of directly analyzing the data transmitted on each antenna using the channel matrix, a simple and efficient method is the use of precoding technology. When the transmit terminal knows the channel state, the precoding technology can equivalently change the channel transfer matrix according to the requirements. The transmitting terminal pre-encodes the data into layers, maps it to antennas and then sends it to the receiving terminal over a wireless channel. If accurate channel state information (CSI) can be known at the transmitting endpoint, singular value decomposition can be implemented for specific channel matrices. After that, a correct singular matrix decomposed from the channel matrix is used as a pre-encoding matrix, and the layer data is pre-encoded. However, the CSI can generally only be acquired accurately and directly at the receiving terminal, and the transmitting terminal can only obtain the CSI by responding to the CSI from the receiving terminal to the transmitting terminal. In a practical system, the cost will be enormous if the CSI is answered back directly, and however it will be limited by the practical system's response overhead. Therefore, a commonly used method is codebook-based response. That is, the receiving terminal selects a suitable codeword from a codebook according to the current state of the channel and responds with an index value of the codeword in the set of codebooks for the receiving terminal. transmission, thus significantly reducing the amount of responses.
    Precoding based on a codebook is a form of channel qualification. Assuming the limited response channel capacity is #bps/Hz, then the number of codewords available is 7V . The vector space characteristic of the channel matrix is qualified to constitute a codebook space 9Í = {Ft,F2 ^FN}. The transmitting terminal and the receiving terminal collectively store or generate, in real time, this codebook IR (which is the same for both the transmitting and receiving terminals). Taking as an example the precoding technology used by the Long Term Evolution (LTE) system, the receiving terminal selects an ideal codeword F from the codebook space according to certain rules, and recommends an index z of the code word F for the transmit terminal. Here, the codeword index is referred to as the Precoding Matrix Indicator (PMI) in the codebook. The transmitting terminal can directly find the corresponding precoded F codeword for transmission according to this index 1, or it can directly select the codeword by itself for transmission instead of accepting the recommended codeword by the receiving terminal. The receiving terminal will be informed of the index of the codeword actually used during the transmission process.
    The Advanced Long Term Evolution (LTE-A) system, which is the standard for the evolution of LTE, supports higher system bandwidth (up to 100MHz), and is reciprocally compatible with the existing LTE standard. In order to increase cell edge coverage and throughput, LTE-A supports transmission of up to 8 antennas and 8 layers in the downlink based on LTE system, and proposes some technologies for response enhancement, which mainly improves codebook response accuracy and can improve the frequency spectrum utilization rate of the International Mobile Telecommunications-Advance (IMT-Advance) system and alleviate the scarcity of frequency spectrum resources. Currently a consensus reached at the 3GPP RAN1 group conference for augmented response technology will be described below. 1) A subband precoding/response structure is composed of two matrices. 2) Each of the two matrices belongs to a separate codebook. The codebook is made known in advance to both a base station and a user equipment (UE). The codebook can vary at different times and different subbands. 3) One matrix represents the attribute of bandwidth or long duration channel, while the other matrix represents the attribute of determined frequency band or short duration channel. 4) The codebook used is represented in the form of limited sets of countable matrices, and each matrix is recognizable to the UE and the base station. Here, it can be seen that a structure based on dual codebooks is proposed for the channel information response. Specifically, for a subband or several joined subbands that require channel information response, the UE feeds back at least two pieces of information PMI, PMI1 and PMI2 respectively, to the base station, wherein PMI1 corresponds to a codeword W1 in codebook C1, while PMI2 corresponds to a codeword W2 in another codebook C2. The base station has the same information of Cl and C2, and finds the corresponding codewords W1 and W2 from the corresponding codebooks Cl and C2, after receiving the PMI1 and PMI2, and obtains the channel information accordingly with the F-function rule named (W1 , W2).
    Codebook size generally determines signaling overhead, and generally the larger the codebook size, the better performance can be achieved. Therefore, the trade-off between performance and overhead is often taken into account when designing the codebook. In practical codebook design, many factors are generally considered, for example the design is adapted to as many channel environments and antenna configuration modes as possible. Therefore, in a given particular transmission condition, all codewords in the codebook are not necessarily adapted to the particular current transmission condition, but the receiving terminal has to run through all codewords in the codebook when select a code word. This will not only bring increased computational complexity to the receiving terminal, but also increase the occurrence of cases where the receiving terminal wrongly selects the codeword due to some non-ideal processes, especially in case of a more range of codebooks. SUMMARY OF THE INVENTION
    A technical problem to be solved by the present invention is to provide a method, device and system for configuring codebooks so as to reduce the complexity of computing a receiving terminal when selecting a codeword, and to reduce instances where the receiving terminal incorrectly selects the codeword.
    In order to solve the above technical problem, the present invention provides a method for configuring codebooks, which is applied in an Advanced Long Term Evolution (LTE-A) system and which comprises: a transmit terminal that selects a restricted subset of codewords and informs a receiving terminal about the restricted subset of codewords, the restricted subset of codewords containing part or all of the codewords in a first codebook and/ or a second codebook; and the receiving terminal selects an ideal precoded codeword from the restricted subset of codewords and informs the transmitting terminal about an index of the ideal precoded codeword.
    Preferably, the method can also have the following features: in the step where the transmitting terminal selects the restricted subset of codewords and informs the receiving terminal about the restricted subset of codewords, the transmitting terminal transmission informs the receiving terminal of the selected restricted subset of codewords through higher level signaling.
    Preferably, the method can also have the following features: in the step where the transmitting terminal selects the restricted subset of codewords and informs the receiving terminal about the restricted subset of codewords, the transmitting terminal transmitting informs the receiving terminal about the selected restricted subset of codewords by sending a signal that supports a restricted subset bitmap to the receiving terminal; wherein each bit of information in the restricted subset bitmap is associated with a codeword to indicate whether the associated codeword belongs to the restricted subset of codewords.
    Preferably, the method can also have the following features: in the step where the transmitting terminal selects the restricted subset of codewords and informs the receiving terminal about the restricted subset of codewords, the transmitting terminal transmission sets the restricted subset bitmap in one of the following ways: (1) executing subset restriction on codewords in the first codebook and second codebook together, where a codeword in the first codebook and a codeword in the second codebook are taken as a combination of codewords, each combination of codewords is associated with an information bit in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook; (2) execution of subset restriction only on codewords in the first codebook, wherein each codeword in the first codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the first codebook and all codewords from the second codebook; (3) execution of subset restriction only on codewords in the second codebook, wherein each codeword in the second codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the second codebook and all codewords from the first codebook; and (4) subset restriction execution on the codewords in the first codebook and second codebook, separately, wherein each codeword in the first codebook and second codebook is associated with a bit of information in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook.
    Preferably, the method can also have the following characteristics: the constrained subset bitmap contains information bits L; when subset restriction is performed on codewords in the first codebook and second codebook together, L = 2M+N ; when the subset restriction is performed only on codewords in the first codebook, L = 2M ; when the subset constraint is only performed on codewords in the second codebook, L = 2N ; and when subset restriction is performed on codewords in the first codebook and second codebook separately, L = 2M+2N ; wherein the first codebook contains M codewords, and the second codebook contains N codewords.
    Preferably, the method also has the following characteristics: the restricted subset of codewords still contains all the codewords in a simple codebook in the case where the simple codebook is used; and in the step where the receiving terminal selects the ideal precoded codeword from the restricted subset of codewords, and informs the transmitting terminal about the ideal precoded codeword index, the receiving terminal selects the ideal precoded codeword from the codewords of the first codebook and second codebook contained in the restricted subset of codewords, or selects the ideal precoded codeword to from the simple codebook codewords contained in the restricted subset of codewords, according to transmission ordering values.
    Preferably, the method also has the following features: the receiving terminal informs the transmitting terminal about the index of the ideal precoded codeword in a periodic response and/or non-periodic response mode; and in the step where the transmitting terminal selects the restricted subset of codewords and informs the receiving terminal about the restricted subset of codewords, the transmitting terminal selects the same restricted subset of codewords. code, or select different restricted subsets of separate code words, according to the form of periodic response and non-periodic response used by the receiving terminal.
    In order to solve the above technical problem, the present invention provides a device for configuring codebooks comprising a first selection module and a first transmit and receive module, wherein the first selection module is configured to select a sub. -restricted set of codewords and inform the first transmit and receive module about the restricted subset of codewords, the restricted subset of codewords containing part or all of the codewords in a first book of codes and/or a second codebook; and the first transmit and receive module is configured to inform a receiving terminal of the selected restricted subset of codewords.
    Preferably, the device can also have the following characteristics: the first selection module is configured to inform the first transmit and receive module about the selected restricted subset of codewords by sending a subset bitmap restricted to first transmit and receive module; and the first transmit and receive module is configured to inform the receiving terminal of the selected restricted subset of codewords by sending a signal that supports the restricted subset bitmap to the receiving terminal; wherein each bit of information in the restricted subset bitmap is associated with a codeword to indicate whether the associated codeword belongs to the restricted subset of codewords.
    Preferably, the device also has the following characteristics: the first selection module is configured to configure the restricted subset bitmap in one of the following ways: (1) execution of subset restriction on codewords in the first book of code and second codebook together, wherein a codeword in the first codebook and a codeword in the second codebook are taken as a combination of codewords, each combination of codewords is associated with one bit of information in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook; (2) execution of subset restriction only on codewords in the first codebook, wherein each codeword in the first codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the first codebook and all codewords from the second codebook; (3) execution of subset restriction only on codewords in the second codebook, wherein each codeword in the second codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the second codebook and all codewords from the first codebook; and (4) subset restriction execution on the codewords in the first codebook and second codebook, separately, wherein each codeword in the first codebook and second codebook is associated with a bit of information in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook.
    Preferably, the device may also have the following characteristics: the first module is further configured to: the bitmap of the restricted subset comprises L information bits; when subset restriction is performed on codewords in the first codebook and second codebook together, L = 2M+N ; when the subset restriction is performed only on codewords in the first codebook, L = 2M ; when the subset constraint is only performed on codewords in the second codebook, L = 2N ; and when subset restriction is performed on codewords in the first codebook and second codebook separately, L = 2M+2N; wherein the first codebook contains M codewords, and the second codebook contains N codewords.
    Preferably, the device can also have the following characteristics: the first selection module is further configured so that the transmit terminal selects the same restricted subset of codewords, or selects different restricted subsets of codewords separately, according to a form of periodic response and non-periodic response used by the receiving terminal. In order to solve the above technical problem, the present invention provides a system for configuring codebooks comprising a transmit terminal comprising the device described above and a receiving terminal comprising a second selection module and a second transmit module and receiving, wherein the second transmit and receive module is configured to obtain a restricted subset of codewords selected by the transmitting terminal and to inform the second selection module about the restricted subset of codewords selected, and to inform the transmitting terminal about an index of an ideal precoded codeword selected by the second selection module; and the second selection module is configured to select the ideal precoded codeword from the restricted subset of codewords and inform the second transmit and receive module about the ideal precoded codeword index . By the present invention, codeword restriction is implemented in the case of dual codebooks in the LTE-A system, such that the complexity of the calculation is reduced when the receiving terminal selects the codeword, the instances in which the receiving terminal wrongly selects the codeword are reduced, and the signaling structure in the LTE system can be very well inherited. BRIEF DESCRIPTION OF THE DRAWINGS
    FIG. 1 is a flowchart of a method of configuring codebooks in accordance with an embodiment of the present invention; and
    FIG. 2 is a block diagram of a codebook configuration system in accordance with an embodiment of the present invention. PREFERRED MODALITIES OF THE PRESENT INVENTION
    In the present invention, subset restriction is performed for dual codebook codewords so as to reduce computation complexity when a receiving terminal selects a codeword. The present invention allows the system to self-define a codebook, in practical applications, and the self-defined codebook (referred to as a restricted subset of codewords) is a codebook in current use for channel information qualification , and which contains all or part of the codewords of a codebook defined in the standard, or contains all or part of the codewords and one or more transmission orderings defined in the standard, or which contains a combination of transmission code and ordinances. The function of such self-defined codebook is called as codebook restriction function, and the receiving terminal can be informed about the restricted subset of codewords by means of a higher level signalling. After being informed of the specific setting of the subset restriction, the receiving terminal will select the ideal precoded codeword from the codewords of the restricted subset of codewords.
    Specifically, as shown in FIG. 1, a method for configuring codebooks in accordance with an embodiment of the present invention, which can be applied in an LTE-A system, comprises the following steps:
    In step 101, a transmitting terminal selects a restricted subset of codewords and informs a receiving terminal about the restricted subset of codewords; the restricted subset of codewords contains part or all of the codewords in a first codebook and/or a second codebook;
    In step 102, the receiving terminal selects an ideal precoded codeword from the restricted subset of codewords and informs the transmitting terminal about an index of the ideal precoded codeword.
    The transmitting terminal and the receiving terminal know all the codewords of the first codebook and second codebook in advance, and the transmitting terminal knows several subsets in which the codewords of the first and second codebook codebook are limited, that is, restricted subsets of codewords.
    The transmitting terminal can inform the receiving terminal about the selected restricted subset of codewords through higher level signaling (e.g., Radio Resource Control (RRC) signaling).
    Specifically, the transmitting terminal can inform the receiving terminal about the selected restricted subset of codewords by sending a signal that supports a bitmap of the restricted subset to the receiving terminal.
    The restricted subset bitmap can specify all the restricted subsets of codewords that can be used by the receiving terminal, and each bit of information in the restricted subset bitmap is associated with a codeword to indicate whether the associated codeword belongs to the restricted subset of codewords. For example, when the value of the information bit is 1, it indicates that the associated codeword is selected from the restricted subset of codewords, whereas when the value of the information bit is 0, it is indicated that the associated codeword is not selected from the restricted subset of codewords.
    In addition, the transmitting terminal can configure the restricted subset bitmap in one of the following ways to implement the subset restriction: (1) execution of the subset restriction on the codewords in the first codebook and second codebook together, wherein a codeword in the first codebook and a codeword in the second codebook are taken as a codeword combination, each codeword combination is associated with a bit of information in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook; (2) execution of subset restriction only on codewords in the first codebook, wherein each codeword in the first codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the first codebook and all codewords from the second codebook; (3) execution of subset restriction only on codewords in the second codebook, wherein each codeword in the second codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the second codebook and all codewords from the first codebook; and (4) subset restriction execution on the codewords in the first codebook and second codebook, separately, wherein each codeword in the first codebook and second codebook is associated with a bit of information in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook. The constrained subset bitmap comprises L information bits (ie L bits), the first codebook contains M codewords, and the second codebook contains N codewords (ie the dimension of the first codebook is M bits, and the dimension of the second codebook is N bits).
    When subset restriction is performed on codewords in the first codebook and second codebook together, L=2M+N.
    When subset restriction is performed only on codewords in the first codebook, L=2M.
    When subset restriction is performed only on codewords in the second codebook, L=2M.
    When subset restriction is performed on codewords in the first codebook and second codebook separately, L=2M+2N.
    The restricted subset of codewords above can still contain all codewords in a simple codebook in the case where the simple codebook is used.
    The receiving terminal can select the ideal precoded codeword from the codewords of the first codebook and second codebook contained in the restricted subset of codewords, or select the precoded codeword ideal from the simple codebook codewords contained in the restricted subset of codewords, according to transmission ordering values.
    The receiving terminal informs the transmitting terminal about an index of the ideal precoded codeword in a periodic response and/or non-periodic response mode.
    The transmitting terminal can select the same restricted subset of codewords, or select different restricted subsets of codewords separately, according to a form of periodic response and non-periodic response used by the receiving terminal.
    Depending on the periodic response mode and the non-periodic response mode used by the receiving terminal, if the transmitting terminal selects the same restricted subset of codewords and the receiving terminal responds with the precodeword index - ideal encoded periodically, using a codebook sampling method, the receiving terminal selects the ideal precoded codeword from an intersection of the subset of the sampled codebook and the restricted subset of words code, according to a sampling rule.
    As shown in FIG. 2, a system for configuring codebooks according to an embodiment of the present invention, applied in an LTE-A system, comprises a transmission terminal comprising a first selection module, and a first transmission and reception module, and a receiving terminal comprising a second selection module and a second transmit and receive module.
    The first selection module is configured to select a restricted subset of codewords and inform the first transmit and receive module about the restricted subset of codewords, the restricted subset of codewords containing part or all codewords in a first codebook and/or a second codebook.
    The first transmit and receive module is configured to inform a receiving terminal of the selected restricted subset of codewords.
    The second transmit and receive module is configured to obtain a restricted subset of codewords selected by the transmitting terminal and to inform the second selection module about the restricted subset of codewords selected, and to inform the transmit terminal over an index of an ideal precoded codeword selected by the second selection module.
    The second selection module is configured to select the ideal precoded codeword from the restricted subset of codewords and inform the second transmit and receive module about the index of the ideal precoded codeword.
    Preferably, the first selection module is further configured to inform the first transmit and receive module about the selected restricted subset of codewords by sending a restricted subset bitmap to the first transmit module and of reception.
    The first transmit and receive module is further configured to inform the receiving terminal of the selected restricted subset of codewords by sending a signal that supports the restricted subset bitmap to the receiving terminal.
    Each bit of information in the restricted subset bitmap is associated with a codeword to indicate whether the associated codeword belongs to the restricted subset of codewords.
    Preferably, the first selection module is further configured to configure the restricted subset bitmap in one of the following ways: (1) execution of subset restriction on codewords in the first codebook and second codebook , together, in which a codeword in the first codebook and a codeword in the second codebook are taken as a combination of codewords, each combination of codewords is associated with an information bit in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook; (2) execution of subset restriction only on codewords in the first codebook, wherein each codeword in the first codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the first codebook and all codewords from the second codebook; (3) execution of subset restriction only on codewords in the second codebook, wherein each codeword in the second codebook is associated with an information bit in the bitmap of the restricted subset, and the subset - restricted set of codewords contains codewords extracted from the second codebook and all codewords from the first codebook; and (4) subset restriction execution on the codewords in the first codebook and second codebook, separately, wherein each codeword in the first codebook and second codebook is associated with a bit of information in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook.
    Preferably, the constrained subset bitmap contains L information bits.
    When subset restriction is performed on codewords in the first codebook and second codebook together, L=2M+N.
    When subset restriction is performed only on codewords in the first codebook, L=2M.
    When subset restriction is performed only on codewords in the second codebook, L=2N.
    When subset restriction is performed on codewords in the first codebook and second codebook separately, L=2M+2N.
    The first codebook contains M codewords, and the second codebook contains N codewords.
    Preferably, the first selection module is further configured so that the transmit terminal selects the same restricted subset of codewords, or selects different restricted subsets of codewords separately, according to a response form periodic and non-periodic response used by the receiving terminal.
    Preferably, the second selection module is further configured such that, depending on the periodic response mode and the non-periodic response mode used by the receiving terminal, if the transmitting terminal selects the same restricted subset of words and the receiving terminal responds with the index of the ideal precoded codeword periodically, using a codebook sampling method, the receiving terminal selects the ideal precoded codeword from an intersection of the subset of the sampled codebook and the restricted subset of codewords, according to a sampling rule.
    The restricted subset of coded words still contains all the coded words in a simple codebook in case the simple codebook is used; the second selection module is further configured to select the ideal precoded codeword from the codewords of the first codebook contained in the restricted subset of codewords, or to select the precoded codeword ideal from the simple codebook codewords contained in the restricted subset of codewords, according to transmission ordering values.
    A device for configuring codebooks according to an embodiment of the present invention, applied in an LTE-A system, comprises a first selection module, and a first transmit and receive module.
    The present invention will be described in more detail below, with reference to specific application examples. The following application examples are described based on taking as an example the restriction of subsets to codewords of a codebook in a closed-loop spatial multiplexing transmission mode, but the present invention is not limited to that. APPLICATION EXAMPLE ONE
    In the LTE-A system, several antennas are configured at a base station of a transmitting terminal and user equipment (UE), of a receiving terminal, and the base station sends the information to the UE via a multiplexing mode. loop space based on precoding. The base station and the UE know the pre-encoded codebooks in advance. Here, the precoded codebooks are of an augmented dual codebook configuration. The base station knows several subsets of codebooks, in which the subset restriction is performed on the first codebook and the second codebook together (ie, the restricted subsets of codewords), and each subset of codebooks contains part or all of the codewords from the first and second codebooks. The base station selects one of the codebook subsets according to a certain mechanism and notifies the UE, by means of a higher level signaling, for example by a radio resource control (RRC) signaling, to Restrict the codebook in the subset for search and selection purposes, when selecting the ideal precoded codeword, and then responds to the transmit terminal with the index of the selected ideal precoded codeword.
    It is assumed that the first codebook and the second codebook known in advance by the base station and UE have the form of codebook constitution shown in Table 1. The dimension of the first codebook is 3 bits, and the dimension of the second codebook is 2 bits. Table 1 The first and second codebook


    Using the subset restriction execution method on the codewords in the first and second codebooks, together, a codeword in the first codebook and a codeword in the second codebook are taken as a combination of words of code, and each combination of code words is associated with an information bit in the constrained subset bitmap. The bitmap is arranged in a bitstream mode of aL_x,...,a3,a2,ai,a0 . When the value of the information bit in the bitmap is 1, it indicates that the associated codeword is selected from the restricted subset, whereas when the value of the information bit is 0, it indicates that the associated codeword is not selected in the restricted subset. At this point, the association relationship between the bitmap and the codeword index is as shown in Table 2.
    Using the subset restriction execution method on the codewords in the first and second codebooks, together, the number of bits of information, or the number of bits of the bitmap of the restricted subset of the restricted subset of words of selected code needed to be informed to the UE is L = 23+2 =32. Table 2 Association relationship between bitmap and codeword index under subset constraint in first codebook and second codebook together

    APPLICATION EXAMPLE TWO
    In the LTE-A system, several antennas are configured at a base station of a transmitting terminal and user equipment (UE), of a receiving terminal, and the base station sends the information to the UE through a mode of closed-loop spatial multiplexing based on precoding. The base station and the UE know the pre-encoded codebooks in advance. Here, the precoded codebooks are of an augmented dual codebook configuration. The base station knows several subsets of codebooks, in which the subset restriction is performed only on the first codebook (ie, the restricted subsets of codewords), and each subset of codebooks contain codewords taken from the first codebook, and all codewords from the second codebook. The base station selects one of the codebook subsets according to a certain mechanism and notifies the UE, by means of a higher level signaling, for example by a radio resource control (RRC) signaling, to restrict the codebook in the subset for search and selection purposes, when selecting the ideal precoded codeword, and then responds to the transmit terminal with the index of the selected ideal precoded codeword.
    It is assumed that the first codebook and the second codebook known in advance by the base station and UE still have the form of codebook constitution shown in Table 1. The dimension of the first codebook is 3 bits, and the dimension of the second codebook is 2 bits.
    Using the subset constraint execution method only on the codewords of the first codebook, each codeword in the first codebook is associated with an information bit in the restricted subset bitmap. The bitmap is arranged in a bitstream mode of aL_1,...,íz3,a2,íz],íz0 . When the value of the information bit in the bitmap is 1, it indicates that the associated codeword is selected from the restricted subset, whereas when the value of the information bit is 0, it indicates that the associated codeword is not selected in the restricted subset. At this point, the association relationship between bitmap and codeword index is as shown in Table 3. Table 3 Association relationship between bitmap and codeword index under subset restriction only in the first book of codes index Cl Bitmap index Cl Bitmap

    Using the subset restriction execution method only in the first codebook, the number of bits of information, or the number of bits of the bitmap of the restricted subset of the selected restricted subset of codewords required to be informed for the UE it is L = 23 = 8 . EXAMPLE OF APPLICATION THREE
    In the LTE-A system, several antennas are configured at a base station of a transmitting terminal and user equipment (UE), of a receiving terminal, and the base station sends the information to the UE via a multiplexing mode. loop space based on precoding. The base station and the UE know the pre-encoded codebooks in advance. Here, the precoded codebooks are of an augmented dual codebook configuration. The base station knows several subsets of codebooks, in which the subset restriction is performed only on the second codebook (ie, the restricted subsets of codewords), and each subset of codebooks contain codewords taken from the second codebook, and all codewords from the first codebook. The base station selects one of the codebook subsets according to a certain mechanism and notifies the UE, by means of a higher level signaling, for example by a radio resource control (RRC) signaling, to restrict the codebook in the subset for search and selection purposes, when selecting the ideal precoded codeword, and then responds to the transmit terminal with the index of the selected ideal precoded codeword.
    It is assumed that the first codebook and the second codebook known in advance by the base station and UE still have the form of codebook constitution shown in Table 1. The dimension of the first codebook is 3 bits, and the dimension of the second codebook is 2 bits.
    Using the subset restriction execution method only on the codewords of the second codebook, each codeword in the second codebook is associated with an information bit in the restricted subset bitmap. The bitmap is arranged in a bitstream mode of . When the value of the information bit in the bitmap is 1, it indicates that the associated codeword is selected from the restricted subset, whereas when the value of the information bit is 0, it indicates that the associated codeword is not selected in the restricted subset. At this point, the association relationship between the bitmap and the codeword index is as shown in Table 4.
    Using the subset restriction execution method only in the second codebook, the number of bits of information, or the number of bits of the bitmap of the restricted subset of the selected restricted subset of codewords required to be reported for the UE is L = 22 = 4 . Table 4 Association relationship between bitmap and codeword index under subset restriction only in second codebook
    APPLICATION EXAMPLE FOUR
    In the LTE-A system, several antennas are configured at a base station of a transmitting terminal and user equipment (UE), of a receiving terminal, and the base station sends the information to the UE via a multiplexing mode. loop space based on precoding. The base station and the UE know the pre-encoded codebooks in advance. Here, the precoded codebooks are of an augmented dual codebook configuration. The base station knows several subsets of codebooks, in which the subset restriction is performed on the first codebook and second codebook, separately (ie, the restricted subsets of codewords) , and each codebook subset contains codewords extracted from the first codebook, and codewords extracted from the second codebook. The base station selects one of the codebook subsets according to a certain mechanism and notifies the UE, by means of a higher level signaling, for example by a radio resource control (RRC) signaling, to Restrict the codebook in the subset for search and selection purposes, when selecting the ideal precoded codeword, and then responds to the transmit terminal with the index of the selected ideal precoded codeword.
    It is assumed that the first codebook and the second codebook known in advance by the base station and UE still have the form of codebook constitution shown in Table 1. The dimension of the first codebook is 3 bits, and the dimension of the second codebook is 2 bits.
    Using the subset restriction execution method on the codewords of the first codebook and the second codebook, separately, each codeword in the first codebook and second codebook is associated with a bit of information in the restricted subset bitmap. The bitmap is arranged in a bitstream mode of aL_y,...,a3,a2,ax,aü . When the value of the information bit in the bitmap is 1, it indicates that the associated codeword is selected from the restricted subset, whereas when the value of the information bit is 0, it indicates that the associated codeword is not selected in the restricted subset. At this point, the association relationship between the bitmap and the codeword indices is as shown in Table 5 .
    Using the subset restriction execution method on the codewords in the first codebook and second codebook, separately, the number of bits of information, or the number of bits of the bitmap of the restricted subset of the sub -restricted set of selected codewords needed to be given to the UE is L = 23 +22 =12 . Table 5 Relation of association between bitmap and codeword index under subset restriction in the first codebook and separate second codebook index Cl Bitmap index C2 Bitmap
    APPLICATION EXAMPLE FIVE
    In the LTE-A system, several antennas are configured at a base station of a transmitting terminal and user equipment (UE), of a receiving terminal, and the base station sends the information to the UE via a multiplexing mode. loop space based on precoding. The base station and the UE know the pre-encoded codebooks in advance. Here, the precoded codebooks are of an augmented dual codebook configuration. The base station knows several subsets of codebooks, in which the subset restriction is performed on the first codebook and second codebook, separately (ie, the restricted subsets of codewords) , and each codebook subset contains codewords extracted from the first codebook, and codewords extracted from the second codebook. The base station selects one of the codebook subsets according to a certain mechanism and notifies the UE, by means of a higher level signaling, for example by a radio resource control (RRC) signaling, to Restrict the codebook in the subset for search and selection purposes, when selecting the ideal precoded codeword, and then responds to the transmit terminal with the index of the selected ideal precoded codeword.
    It is assumed that the dual codebooks known in advance by the base station and UE are constituted using the following method.
    When the transmission ordering (RI) is very low, for example when RI = 1 or RI = 2, but the present invention is not limited thereto, the UE sends a response with pre-encoded information in a book-book mode. dual codes; when the transmission ordering is high, for example when RI> 2, but the present invention is not limited thereto, the UE responds with pre-encoded information in a simple codebook mode. In the dual codebook portion, the size of the first codebook is 3 bits, and the size of the second codebook is 2 bits. The codebook dimension in the simple codebook portion is 3 bits,
    The codebook constitution form shown in Table 6 is used in this example. Table 6 Codebook under a given antenna configuration

    Using the subset restriction execution method on the codewords of the first codebook and the second codebook, separately, each codeword in the first codebook and second codebook is associated with a bit of information in the restricted subset bitmap. The bitmap is arranged in a bitstream mode of . When the value of the information bit in the bitmap is 1, it indicates that the associated codeword is selected from the restricted subset, whereas when the value of the information bit is 0, it indicates that the associated codeword is not selected in restricted subset 15. It should be noted here that since a single codebook is used in the case of high transmission ordering, the subset restriction is performed only in the codebook part of the dual codebooks, during the subset restriction. -set, and the single portion of the codebook is no longer restricted. Therefore, the restricted subset of the codebook formed at that time contains the codewords extracted from the first codebook and the codewords extracted from the second codebook, as well as all the codewords in the simple codebook.
    The association relationship between the bitmap and the codeword index is as shown in Table 7.
    Using the subset restriction execution method on the codewords in the first codebook and second codebook, separately, the number of bits of information, or the number of bits of the bitmap of the restricted subset of the sub -restricted set of selected codewords needed to be given to the UE is L = 23 +22 =12 . Table 7 Relation of association between bitmap and codeword index under subset restriction in the first codebook and second codebook of the dual codebook portion, separately
    APPLICATION EXAMPLE SIX
    In the LTE-A system, several antennas are configured at a base station of a transmit terminal and user equipment (UE), of a receiving terminal, and the base station sends the information to the UE via a spatial multiplexing mode. closed loop based on precoding. The base station and the UE know the pre-encoded codebooks in advance. Here, the precoded codebooks are of an augmented dual codebook configuration. The base station knows several subsets of codebooks, in which the subset restriction is performed on the first codebook and second codebook, separately (ie, the restricted subsets of codewords) , and each codebook subset contains codewords extracted from the first codebook, and codewords extracted from the second codebook. The base station selects one of the codebook subsets according to a certain mechanism and notifies the UE, by means of a higher level signaling, for example by a radio resource control (RRC) signaling, to Restrict the codebook in the subset for search and selection purposes, when selecting the ideal precoded codeword, and then responds to the transmit terminal with the index of the selected ideal precoded codeword. The UE may respond to the base station with the pre-encoded information using two response modes, periodic response and non-periodic response.
    For periodic response and non-periodic response, the base station can perform codeword restriction for periodic response and non-periodic response by selecting a subset of codebooks A, through a certain mechanism. , that is, the same bitmap is used for periodic response and non-periodic response; or for periodic and non-periodic response, the base station can perform codeword restriction for periodic response and non-periodic response, respectively, by selecting different subsets of codebooks A and B, through of a given engine, ie different bitmaps are used for periodic response and non-periodic response.
    When the base station performs codeword restriction for periodic response and non-periodic response, by selecting the codebook subset A, since the uplink physical control channel (PUCCH), which supports periodic response, is limited by signaling overhead, a method of sampling codewords in codebook will generally be used to control signaling response overhead, and subset of codebooks sampled according to a sampling rule is C. Therefore, the subsets of codebooks A and C, in which the UE looks for codebooks for the periodic response, are determined at the same time, i.e., AIC.
    It is assumed that the first codebook and the second codebook known in advance by the base station and UE have the form of codebook constitution shown in Table 1. Using the subset restriction execution method on the words of code from the first codebook and the second codebook, separately, the association relationship between the bitmap and the codeword index is as shown in Table 5.
    When the same restricted subset of codebooks A is used for the same periodic response and non-periodic response, the base station can notify, through the information of the bitmap A={an,...,a3,a2, al,a0] = |0,0,1,1,0,0,0,0,1,1,1,1} , the UE to search for the codewords in subset A, with periodic response or response not periodic.
    When different restricted subsets of codebooks are used for periodic response and non-periodic response, assuming that codebook A is used for periodic responses and codebook B is used for non-periodic responses, the station can notify, through the bitmap information A={α11,...,α3,o2,α1,α0} = {0,0,0,1,0,0,0,0,1,0, 1.0} and B={α11,...,α3,α2,α1,i 0} = {0,0,1,1,0,0,0,0,1,0,1,0} , the UE to search for the codewords in subset A, with periodic response, and to search for the codewords in subset B, with non-periodic response.
    When the same bitmap A={α11,...,α3,α2,iz1,α0} = {0,0,1,1,0,0,0,0,1,1,1,1} is used for the periodic response and non-periodic response, and the codeword sampling method in the codebook is used for the periodic response, it is assumed that the sampled codebook used by the periodic response is as shown in Table 8. At this point , the subset of codebooks for the UE to search for the codewords, which is determined by both the bitmap information and the sampling rule is
    Table 8 The first codebook and second codebook after the codebooks in Table 1 are sampled

    It can be understood by those skilled in the art that all or some of the steps of the described method can be implemented by related hardware instructed by programs, which can be stored on computer readable storage media, such as a read-only memory, disk or CD- ROM, etc. Alternatively, all or some of the steps in the above-described embodiments can be implemented using one or more integrated circuits. Consequently, each module/unit in the modalities described above can be implemented in a form of functional module in hardware or software. The present invention is not limited to combinations of hardware and software in any particular form.
    Of course, other embodiments of the present invention may also be possible. Various modifications and variations of the present invention can be made by those skilled in the art without departing from the spirit and essence of the present invention. However, such modifications and corresponding variations are to be embraced within the scope of protection of the appended claims of the present invention. INDUSTRIAL APPLICABILITY
    By the present invention, codeword restriction is implemented in the case of dual codebooks in the LTE-A system, such that the complexity of the calculation is reduced when the receiving terminal selects the codeword, the instances in which the receiving terminal wrongly selects the codeword are reduced, and the signaling structure in the LTE system can be very well inherited.
    权利要求:
    Claims (7)
    [0001]
    1. METHOD FOR THE CONFIGURATION OF CODE BOOKS, which is applied in an Advanced Long Term Evolution (LTE-A) system and comprising: a transmission terminal that selects a restricted subset of code words and informs a receiving terminal on the restricted subset of codewords, the restricted subset of codewords containing part or all of the codewords in a first codebook and/or a second codebook (S101); and the receiving terminal selects an ideal precoded codeword from the restricted subset of codewords and informs the transmitting terminal about an index of the ideal precoded codeword (S102) where, in step wherein the transmitting terminal selects the restricted subset of codewords and informs the receiving terminal about the restricted subset of codewords, the transmitting terminal informs the receiving terminal about the restricted subset of codewords of selected code, by sending a signal that supports a restricted subset bitmap to the receiving terminal; and wherein each bit of information in the restricted subset bitmap is associated with a codeword for indicating whether the associated codeword belongs to the restricted subset of codewords characterized by the transmitting terminal configuring the subset bitmap. restricted set as follows: executing subset restriction on codewords in the first codebook and second codebook, separately, wherein each codeword in the first codebook and second codebook is associated with a bit of information in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook where the restricted subset of codewords it still contains all the codewords in a single codebook in the case where the single codebook is used; and in the step where the receiving terminal selects the ideal precoded codeword from the restricted subset of codewords, and informs the transmitting terminal about the ideal precoded codeword index, the terminal selects the ideal precoded codeword from the codewords of the first codebook and second codebook contained in the restricted subset of codewords, or selects the ideal precoded codeword from the codewords from the single codebook contained in the restricted subset of codewords, according to transmission ordering values.
    [0002]
    2. METHOD according to claim 1, characterized in that in the step in which the transmitting terminal selects the restricted subset of codewords and informs the receiving terminal about the restricted subset of codewords, the terminal The transmitting terminal informs the receiving terminal of the selected restricted subset of codewords by means of a higher level signaling.
    [0003]
    3. METHOD, according to claim 2, characterized in that the restricted subset bitmap contains information bits L; when the subset restriction is performed on the codewords in the first codebook and the second codebook separately, L=2M +2N ; where M is the number of codewords in the first codebook and N is the number of codewords in the second codebook.
    [0004]
    4. METHOD according to any one of claims 1 to 3 characterized by the receiving terminal informs the transmitting terminal about the index of the ideal precoded codeword in a periodic response and/or non-periodic response mode; and in the step where the transmitting terminal selects the restricted subset of codewords and informs the receiving terminal about the restricted subset of codewords, the transmitting terminal selects the same restricted subset of codewords. code for periodic response and/or non-periodic response, or select different restricted subsets of separate codewords, according to the form of periodic response and non-periodic response used by the receiving terminal.
    [0005]
    5. DEVICE FOR THE CONFIGURATION OF CODE BOOKS, comprising a first selection module and a first transmit and receive module, wherein the first selection module is configured to select a restricted subset of code words and inform the first transmit and receive module on the restricted subset of codewords, the restricted subset of codewords containing part or all of the codewords in a first codebook and/or a second codebook; and the first transmit and receive module is configured to inform a receiving terminal of the selected restricted subset of codewords; the first selection module is configured to inform the first transmit and receive module about the selected restricted subset of codewords by sending a restricted subset bitmap to the first transmit and receive module; and the first transmit and receive module is configured to inform the receiving terminal of the selected restricted subset of codewords by sending a signal that supports the restricted subset bitmap to the receiving terminal; characterized in that each bit of information in the bitmap of the restricted subset is associated with a codeword to indicate whether the associated codeword belongs to the restricted subset of codewords; the first selection module is configured to configure the constrained subset bitmap as follows: subset constrain execution on codewords in the first codebook and second codebook separately, where each codeword in the first codebook and second codebook is associated with an information bit in the bitmap of the restricted subset, and the restricted subset of codewords contains codewords extracted from the first codebook and codewords extracted from the second codebook, in which the first selection module is further configured so that the transmit terminal selects the same restricted subset of codewords, or selects different subsets for the periodic response and non-periodic restricted response of words of code separately, according to a form of periodic response and non-periodic response used by the receiving terminal.
    [0006]
    6. DEVICE according to claim 5, characterized in that the first selection module is further configured so that: the restricted subset bitmap comprises L bits of information, when the subset restriction is performed on the code words in the first book of codes and in the second codebook separately, L =2M +2N ; where M is a number of codewords in the first codebook and N is a number of codewords in the second codebook.
    [0007]
    7. SYSTEM FOR THE CONFIGURATION OF CODE BOOKS, characterized in that it comprises the device as defined in claim 5 or 6, and a transmission terminal, a receiving terminal comprising a second selection module and a second transmission and reception module, wherein the second transmit and receive module is configured to obtain a restricted subset of codewords selected by the device and to inform the second selection module about the restricted subset of codewords selected, and to inform the device over an index of an ideal precoded codeword selected by the second selection module; and the second selection module is configured to select the ideal precoded codeword from the restricted subset of codewords and inform the second transmit and receive module about the ideal precoded codeword index .
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    同族专利:
    公开号 | 公开日
    JP2013522982A|2013-06-13|
    CN101917365B|2015-06-03|
    CN101917365A|2010-12-15|
    US20130136203A1|2013-05-30|
    RU2549508C2|2015-04-27|
    RU2012136922A|2014-09-27|
    BR112012022728A2|2018-06-05|
    WO2012022100A1|2012-02-23|
    KR101489879B1|2015-02-04|
    EP2536083A4|2017-08-23|
    US8976839B2|2015-03-10|
    EP2536083A1|2012-12-19|
    MX2012010581A|2012-10-09|
    KR20120128673A|2012-11-27|
    EP2536083B1|2019-03-27|
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-02-27| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-03-10| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04L 25/03 Ipc: H04B 1/62 (2006.01), H04B 7/0456 (2017.01), H04B 7 |
    2021-03-02| 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
    CN2010102575147|2010-08-16|
    CN201010257514.7A|CN101917365B|2010-08-16|2010-08-16|Method, device and system for configuring codebook|
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