CN116155452B - Method and device for determining maximum layer number of LDPC code rate matching - Google Patents

Method and device for determining maximum layer number of LDPC code rate matching Download PDF

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CN116155452B
CN116155452B CN202310429060.4A CN202310429060A CN116155452B CN 116155452 B CN116155452 B CN 116155452B CN 202310429060 A CN202310429060 A CN 202310429060A CN 116155452 B CN116155452 B CN 116155452B
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network
parameter
ldpc code
layer number
maximum layer
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CN116155452A (en
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颜灵恩
范晓骏
李强
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ASR Microelectronics Co Ltd
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ASR Microelectronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application discloses a method and a device for determining the maximum layer number of LDPC code rate matching. In the process of accessing the 5G NR network by the UE, the network adjusts the modulation order and/or the number of physical resource blocks to enable the length of the coded code block to be smaller than or equal to the length of the reference code block when the specific parameter is the minimum value; the maximum number of layers used by the UE in LDPC code rate matching is any of 1, 2, 3, 4. After the UE accesses the 5G NR network, the network issues an RRC configuration message, wherein whether the network chooses to configure the maxMIMO-Layers parameter and the maxRank parameter is recorded. If yes, the UE receives the RRC configuration message, obtains the value of the network configuration parameter, and changes the maximum layer number used when the LDPC code rate is matched into the smaller value of the network configuration parameter and 4. If not, the UE receives the RRC configuration message. The application ensures the accuracy of the rate matching process.

Description

Method and device for determining maximum layer number of LDPC code rate matching
Technical Field
The present application relates to a mobile communication technology, and more particularly, to a rate matching (rate matching) technology of an LDPC code (LDPC code, low density parity check code, low density parity check code).
Background
5G NR (New Radio) is a New Radio access technology for fifth generation mobile communication networks (5G).
The 5G NR network uses LDPC codes in a downlink shared channel (DL-SCH), a Paging Channel (PCH), and an uplink shared channel (UL-SCH) to increase reliability of communication. In the 5G NR network, since actual transmission resources are limited, data after LDPC encoding and actual transmission resources need to be aligned through a rate matching operation. The network side and the terminal side need to align the data using the same rate matching parameters to ensure that the received data can be correctly rate matched and decoded.
Please refer toWhen reading fig. 1,5g NR network performs bit selection process in LDPC code rate matching, it is first required to obtain a rate matching parameter. The rate matching parameters comprise the maximum layer number v and the maximum modulation order Q used by the transmission channel m Number of physical resource blocks n PRB Number of resource units N RE The highest code rate R. Subsequently calculating a transport block size (transport block size, TBS) TBS at finite-buffer rate matching (limited buffer rate matching, LBRM) LBRM Further obtain the reference code block lengthWherein->Represents the downward rounding, C represents the number of code blocks, and the reference code rate R when the finite buffer rate is matched LBRM Fixed at 2/3. The reference code block length refers to the length of the code block used for reference in rate matching. The cyclic buffer size N of each Code Block (CB) is then calculated cb ，N cb ＝min(N,N ref ). Where min () represents a minimum function and N represents the encoded code block length. Then according to N cb The starting position k0 values corresponding to the different redundancy versions (redundancy version, rv) are obtained. And finally, obtaining output sequences selected by the rate matching bits corresponding to different rv according to the k0 value.
In the flow shown in FIG. 1, there is a step of determining the circular buffer size N of each code block cb 。N cb Is related to the maximum number of layers used by the transport channel. If the LDPC code rate matching is performed in the downlink shared channel, the maximum number of layers used by the transport channel refers to the maximum number of layers of one transport block (transport block) of the downlink shared channel, specifically, the maximum number of MIMO (multiple-input multiple-output) layers used when the network transmits the PDSCH (Physical Downlink Shared Channel) to the UE. If LDPC code rate matching is performed in the uplink shared channel, the maximum layer number used by the transmission channel refers to the maximum layer number of one transmission block of the uplink shared channel, specifically refers to the transmission of UE to the networkMaximum MIMO layer number used when PUSCH (Physical Uplink Shared Channel ) is transmitted. The maximum number of layers used for the transport channel is determined by both the network configuration and the UE (User equipment) capability. The network acquires the maximum layer number supported by the UE through the capability information reported by the UE. The maximum number of layers supported by the UE refers to the maximum number of MIMO layers supported by the UE when the UE receives PDSCH (downlink scenario) or transmits PUSCH (uplink scenario), and may take an integer between 1 and 8 (downlink scenario) or an integer between 1 and 4 (uplink scenario). After the UE reports the capability, the network configures a maxMIMO-Layers parameter and/or a maxRank parameter according to the capability of the UE, where both parameters are used to indicate the maximum MIMO layer number used by the PDSCH (downlink scenario) or PUSCH (uplink scenario) of the UE at the cell level. But before the reporting capability of the UE, the network cannot know the maximum number of layers supported by the UE, and at this stage the network and the UE are calculating N cb The maximum number of layers used may not match. Thus, before the network obtains capability information of the UE, the network and the rate matching parameters of the UE (in particular N cb ) There may be a difference that easily causes errors in the output of the uplink and downlink data, and the retransmission data may not be correctly combined and decoded.
Referring to fig. 2, the basic flow of interaction between the ue and the 5G NR network includes four phases T1, T2, T3, and T4. The T1 stage is a UE access procedure, and after the UE random access (random access) is successful, the network issues an RRC (radio resource control ) configuration message (rrcSetup) to provide configuration information to the UE. The T2 stage is between when the UE receives the RRC configuration message and when it sends a UE capability information message (ueCapabilityInformation), the UE sends its capability information to the network by sending the UE capability information message. The T3 phase is between when the network receives the UE capability information message and when the network sends an RRC reconfiguration message (rrcrreconfiguration), the network configures the maximum number of layers used by the transport channel in combination with the UE capability issuing the RRC reconfiguration message. The T4 phase is after the UE successfully receives the RRC reconfiguration message. The above list of flows and messages related to the present patent application does not relate to all signalling interactions.
Disclosure of Invention
The technical problems to be solved by the application are as follows: before the network knows the maximum layer number supported by the UE, how to determine the maximum layer number used by the network and the UE for transmitting the channel when the LDPC code rate is matched can avoid transmission errors.
In order to solve the technical problems, the application provides a method for determining the maximum layer number of LDPC code rate matching, which comprises the following steps. Step S1: in the process of accessing the UE into the 5G NR network, the network enables one of the maxMIMO-Layers parameter or the maxRank parameter to take a minimum value of 1 and calculates the corresponding reference code block length; the network adjusts the modulation order and/or the number of physical resource blocks to make the length of the coded code block smaller than or equal to the length of the reference code block; the maximum layer number used by the UE in LDPC code rate matching is any of 1, 2, 3, 4. Step S2: after the UE is accessed to the 5G NR network, the network transmits an RRC configuration message, wherein whether the network selects to configure a maxMIMO-Layers parameter or not is recorded; if yes, the value of the configured parameter is recorded. If the network chooses to configure any or all parameters, step S3 is entered; otherwise, step S4 is entered. Step S3: the UE receives the RRC configuration message, acquires the value of the network configuration parameter, and changes the maximum layer number used when the LDPC code rate is matched into the smaller value of the network configuration parameter and 4. Step S4: the UE receives the RRC configuration message, and the network adjusts the modulation order and/or the number of physical resource blocks to enable the length of the coded code block to be smaller than or equal to the length of the reference code block; the maximum layer number used by the UE in LDPC code rate matching is any of 1, 2, 3, 4.
Further, only maxMIMO-Layers parameters are in the downlink scene; the uplink scene has maxMIMO-Layers parameters and/or maxRank parameters; if the maxMIMO-Layers parameter and the maxRank parameter are configured in the uplink scene at the same time, the maxMIMO-Layers parameter and the maxRank parameter are configured to be the same value.
Further, in the step S2, if the network selects to configure the maxmmo-Layers parameter, the value is 1; if the network selects to configure the maxRank parameter, the value is also 1. This is a preferred way of value taking, with the advantage of being adaptable to various types of UEs.
Alternatively, step S1 is replaced by the sum of step S1a and step S1 b; step S4 is replaced with step S4 a. Step S1a: the network and the UE agree in advance on the maximum number of layers used by the network and the UE when the LDPC code rates are matched. Step S1b: in the process of accessing the 5G NR network by the UE, the maximum layer number used by the network and the UE when the LDPC code rates are matched is a preset value. The "enter step S4" in the step S2 is changed to "enter step S4a". Step S4a: the UE receives the RRC configuration message, and the maximum layer number used by the network and the UE when the LDPC code rates are matched is a preset value.
Preferably, in the step S1a, the network and the UE pre-agree that the maximum layer number used by one transport block of the downlink shared channel is Z1 and the maximum layer number used by one transport block of the uplink shared channel is Z2 when the network and the UE are in rate matching of the LDPC code; for all types of UEs, Z1 is the same value, as is Z2.
Preferably, in the step S1a, the contract manner is changed to: z1 of different types of UE respectively take values, and Z2 of different types of UE respectively take values.
Preferably, in the step S1a, the contract manner is changed to: z1 of different types of UE respectively take values, Z2 of different types of UE respectively take values, and the value of Z1 is the minimum number of receiving antenna ports of the UE required by the working frequency band of the cell.
Further, the step S3, the step S4 or the step S4a further includes the following steps. Step S5: the network receives the UE capability information message of the UE, and learns the maximum layer number supported by the UE from the UE capability information message; the network prepares to send RRC reconfiguration information to the UE, wherein whether the network chooses to configure maxMIMO-Layers parameters or not is recorded; if yes, the value of the configured parameter is recorded. If the network chooses to configure any or all parameters, step S6 is entered; otherwise, step S7 is entered. Step S6: the network issues an RRC reconfiguration message; the UE receives the RRC reconfiguration message, acquires the value of the network configuration parameter, and changes the maximum layer number used when the LDPC code rate is matched into the smaller value of the network configuration parameter and the smaller value of 4. Step S7: the network issues an RRC reconfiguration message; the UE receives the RRC reconfiguration message and changes the maximum number of layers used when the LDPC code rates are matched to the smaller of the maximum number of layers supported by the UE and 4.
The application also provides a device for determining the maximum layer number of LDPC code rate matching, which comprises a first access process processing unit, a configuration message issuing unit, a first configuration message processing unit and a second configuration message processing unit. The access process processing unit is used for enabling one of the maxMIMO-Layers parameter or the maxRank parameter to take a minimum value of 1 and calculating the corresponding reference code block length in the process that the UE accesses the 5G NR network; the network adjusts the modulation order and/or the number of physical resource blocks to make the length of the coded code block smaller than or equal to the length of the reference code block; the maximum layer number used by the UE in LDPC code rate matching is any of 1, 2, 3, 4. The configuration message issuing unit is used for issuing RRC configuration messages by the network after the UE is accessed to the 5G NR network, wherein whether the network selects to configure maxMIMO-Layers parameters and maxRank parameters is recorded; if yes, the value of the configured parameter is recorded; if the network chooses to configure any or all parameters, entering a configuration message processing unit I; otherwise, enter the second configuration message processing unit. The configuration message processing unit is used for receiving the RRC configuration message by the UE, obtaining the value of the network configuration parameter, and changing the maximum layer number used when the LDPC code rate is matched into the smaller value of the network configuration parameter and the smaller value of the network configuration parameter are used for the maximum layer number when the LDPC code rate is matched. The second configuration message processing unit is used for receiving RRC configuration messages by the UE, and the network adjusts the modulation order and/or the number of physical resource blocks so that the length of the coded code blocks is smaller than or equal to the length of the reference code blocks; the maximum layer number used by the UE in LDPC code rate matching is any of 1, 2, 3, 4.
Optionally, the sum of the pre-provisioning unit and the second access procedure processing unit is used to replace the first access procedure processing unit, and the third configuration message processing unit is used to replace the second configuration message processing unit. The pre-agreed unit is used for the network and the UE to pre-agree on the maximum layer number used by the network and the UE when the LDPC code rate is matched. And the second access process processing unit is used for setting the maximum layer number used by the network and the UE when the LDPC code rate is matched in the process of accessing the 5G NR network by the UE as a preset value. The configuration message issuing unit is changed into a configuration message processing unit II and a configuration message processing unit III. And the configuration message processing unit III is used for receiving the RRC configuration message by the UE, and the maximum layer number used by the network and the UE when the LDPC code rate is matched is a preset value.
The application has the technical effects that: before the network knows the maximum layer number supported by the UE, the network and the UE are mutually matched, so that the clear rate matching maximum layer number between the UE and the network in each signaling stage is ensured, and the accuracy of the rate matching process is ensured.
Drawings
Fig. 1 is a flow chart of a bit selection process in rate matching for a 5G NR network.
Fig. 2 is a schematic diagram of a signaling interaction flow between a UE and a 5G NR network.
Fig. 3 is a flowchart of an embodiment one of a method for determining a maximum layer number of rate matching of an LDPC code according to the present application.
Fig. 4 is a flowchart of a second embodiment of a method for determining a maximum layer number of rate matching of an LDPC code according to the present application.
Fig. 5 is a schematic diagram of the subsequent process of fig. 3 and 4.
Fig. 6 is a schematic structural diagram of an embodiment one of an apparatus for determining the maximum layer number of rate matching of an LDPC code according to the present application.
Fig. 7 is a schematic structural diagram of a second embodiment of an apparatus for determining a maximum layer number of rate matching of an LDPC code according to the present application.
The reference numerals in the drawings illustrate: 1 is an access process processing unit I, 1a is a preset unit, 1b is an access process processing unit II, 2 is a configuration message issuing unit, 3 is a configuration message processing unit I, 4 is a configuration message processing unit II, and 4a is a configuration message processing unit III.
Detailed Description
Referring to fig. 3, an embodiment of a method for determining the maximum layer number of rate matching of an LDPC code according to the present application includes the following steps.
Step S1: during the process of accessing the 5G NR network by the UE.
For the downlink scenario, the UE has not acquired the maxmmo-Layers parameter from the network at this time. maxMIMThe O-Layers parameter is a higher layer parameter that the network configures to the UE, here to indicate the maximum number of MIMO Layers used by the PDSCH of the UE at the cell level. The network makes the maxMIMO-Layers parameter take the minimum value of 1, and calculates the corresponding reference code block length. The reference code block length +.>Is based on the current value of maxMIMO-Layers parameter and the maximum modulation order Q m Number of physical resource blocks n PRB Number of resource units N RE And the highest code rate R is calculated by combining with a 5G NR protocol. The network adjusts the modulation order (modulation coding scheme, MCS) and/or the number of physical resource blocks n of the downlink scheduling (DL grant) PRB So that the encoded code block length N is less than or equal to +.>. At this time, the UE calculates the cyclic buffer size of each code blockTherefore, no matter the maximum layer number used by one transport block of the downlink shared channel by the UE in the rate matching is any one value of 1, 2, 3 and 4, the UE can be ensured to correctly decode the rate matching. At this time, the maximum number of layers used by one transport block of the downlink shared channel may be any of 1, 2, 3, and 4 when the LDPC code rate is matched.
For the uplink scenario, the UE has not acquired the maxMIMO-Layers parameter or maxRank parameter from the network. The maxMIMO-Layers parameter, maxRank parameter, is two higher layer parameters configured by the network to the UE, here used to indicate the maximum MIMO layer number used by the PUSCH of the UE at the cell level. The maxMIMO-dyes parameter exists in both the downlink scene and the uplink scene. The maxRank parameter exists only in the upstream scenario. The network makes one of the maxMIMO-Layers parameter or maxRank parameter take the minimum value 1, and calculates the corresponding reference code block length. The reference code block length N ref Based on the current value of maxMIMO-Layers parameter or maxRank parameter, the maximum modulation order Q m Number of physical resource blocks n PRB Number of resource units N RE And the highest code rate R is calculated by combining with a 5G NR protocol. The network adjusts the modulation order of uplink scheduling (UL grant) and/or the number n of physical resource blocks PRB So that the encoded code block length N is less than or equal to +.>. At this time, the cyclic buffer size of each code block calculated by the UE +.>Therefore, no matter the maximum layer number used by one transmission block of the uplink shared channel during rate matching of the UE is any one value of 1, 2, 3 and 4, the UE can be ensured to correctly decode the rate matching. At this time, the maximum number of layers used by one transport block of the uplink shared channel may be any of 1, 2, 3, and 4 when the LDPC code rates are matched.
Step S2: after the UE accesses the 5G NR network, the network issues an RRC configuration message.
For the downlink scenario, the RRC configuration message includes configuration information PDSCH-ServingCellConfig of the physical downlink shared channel PDSCH. The configuration information of the PDSCH records whether the network selects to configure the maxMIMO-relays parameter. If the network selects to configure the maxMIMO-Layers parameter in the RRC configuration message, the configuration information of the PDSCH also records that the value of the maxMIMO-Layers parameter configured by the network is X. The value range of X is any integer between 1 and 8 (including 1 and 8). Considering that the capabilities of UEs are not the same, the number of supported layers is different, preferably, the value of X is 1, so that all types of UEs can be suitable.
For the uplink scenario, the RRC configuration message includes configuration information PUSCH-Config of a physical uplink shared channel PUSCH and configuration information PUSCH-ServingCellConfig of a PUSCH serving cell. The configuration information of the PUSCH serving cell records whether the network selects and configures the maxMIMO-relays parameter, and the configuration information of the PUSCH records whether the network selects and configures the maxRank parameter. If the network selects and configures the maxMIMO-relays parameter in the RRC configuration message, the configuration information of the PUSCH service cell also records that the value of the maxMIMO-relays parameter configured by the network is X0. If the network selects to configure the maxRank parameter in the RRC configuration message, the configuration information of the PUSCH also records that the value of the maxRank parameter configured by the network is X1. If the network chooses to configure the maxMIMO-Layers parameter and the maxRank parameter at the same time, the maxRank parameter is configured to have the same value as the maxMIMO-Layers parameter according to the protocol rule, that is, x0=x1 at this time. The values of X0 and X1 are all integers (including 1 and 4) between 1 and 4. Considering that the capabilities of UEs are not the same, the number of supported layers is different, preferably, the value of X0 is 1, and the value of X1 is 1, so that all types of UEs can be adapted.
If the network has configured any or all of the maxMIMO-Layers parameters or maxRank parameters in the RRC configuration message, step S3 is entered.
If the network does not configure the maxMIMO-Layers parameter and the maxRank parameter in the RRC configuration message, the step S4 is performed.
Step S3: the UE receives the RRC configuration message. Any one or all of the maxMIMO-dyes parameters or maxRank parameters are configured in the RRC configuration message at this time.
For the downlink scenario, the UE obtains the value X of the maxmmo-Layers parameter described in the PDSCH configuration information. The maximum layer number used by one transport block of the downlink shared channel by the UE is changed to min (X, 4) when the LDPC code rate is matched.
For the uplink scenario, the UE obtains the value X0 of the maxMIMO-Layers parameter described in the PUSCH serving cell configuration information, or the UE obtains the value X1 of the maxRank parameter described in the PUSCH configuration information. The maximum layer number used by one transport block of the uplink shared channel when the LDPC code rates are matched by the UE is changed to min (X0, 4) or min (X1, 4). If X0, X1 are present at the same time, x0=x1 is specified according to the protocol, so min (X0, 4) =min (X1, 4).
Step S4: the UE receives the RRC configuration message. At this time, the maxMIMO-Layers parameter is not configured in the RRC configuration message, and the maxRank parameter is not configured.
For downlink scene, the network adjusts the modulation order of downlink scheduling and/or the number n of physical resource blocks PRB So that the encoded code block length N is less than or equal to. At this time, the maximum number of layers used by one transport block of the downlink shared channel may be any of 1, 2, 3, and 4 when the LDPC code rate is matched.
For the uplink scene, the network adjusts the modulation order of uplink scheduling and/or the number n of physical resource blocks PRB So that the encoded code block length N is less than or equal to. At this time, the maximum number of layers used by one transport block of the uplink shared channel may be any of 1, 2, 3, and 4 when the LDPC code rates are matched.
Referring to fig. 4, an embodiment of a method for determining the maximum layer number of rate matching of an LDPC code according to the present application includes the following steps. In the second embodiment, step S1 in the first embodiment is replaced by the sum of step S1a and step S1 b. Step S4a is replaced with step S4a in the second embodiment.
Step S1a: the network and the UE pre-define that the maximum layer number used by one transmission block of the downlink shared channel is Z1 and the maximum layer number used by one transmission block of the uplink shared channel is Z2 when LDPC code rate matching is carried out, and the value ranges of Z1 and Z2 are any integer (including 1 and 4) between 1 and 4. The first convention is: for all types of UEs, the network and the UE agree that Z1 is the same value and Z2 is the same value, e.g. the values are all 1. The second convention is: if the network can learn the type of UE, such as an eMBB (enhanced mobile broadband ) terminal, a URLLC (Ultra-reliable low latency communication, ultra-reliable low latency communication) terminal, an emtc (Massive Machine-Type Communications) terminal, a RedCap (reduced capability, reduced performance) terminal, etc., then the network and the UE agree that the Z1 of the UE of different types each take a value, which may be the same value or different values; the values of Z2 of different types of UEs may be the same value or different values. The third convention is: if the network can acquire the type of the UE, the network and the UE agree on the value of each Z1 of the UE of different types, the value of each Z2 of the UE of different types is the minimum number of receiving antenna ports (Rx antenna ports) of the UE required by the working frequency band (operating band) where the cell is located.
Step S1b: in the process of accessing the 5G NR network by the UE, the maxMIMO-relays parameter or maxRank parameter is not acquired from the network at the moment by the UE. For the downlink scene, the maximum layer number used by one transmission block of a downlink shared channel when the network and the UE are in LDPC code rate matching is Z1 which is agreed in advance. For the uplink scene, when the network and the UE match the LDPC code rate, the maximum layer number used by one transmission block of the uplink shared channel is Z2 which is agreed in advance.
Step S2 and step S3 are the same as those of the first embodiment. Except that the "enter step S4" described in step S2 is changed to "enter step S4a".
Step S4a: the UE receives the RRC configuration message. At this time, the maxMIMO-Layers parameter is not configured in the RRC configuration message, and the maxRank parameter is not configured. For the downlink scene, the maximum layer number used by one transmission block of a downlink shared channel when the network and the UE are in LDPC code rate matching is Z1 which is agreed in advance. For the uplink scene, when the network and the UE match the LDPC code rate, the maximum layer number used by one transmission block of the uplink shared channel is Z2 which is agreed in advance.
The above two embodiments correspond to fig. 2 before the UE sends the UE capability information message to the network. The remainder of fig. 2 is the subsequent processing flow of the above two embodiments, which further includes the following steps after the step S3, the step S4, or the step S4a, as shown in fig. 5.
Step S5: the network receives a UE capability information message of the UE, in which capability information reported by the UE is described. The network acquires the maximum layer number M supported by the UE from the capability information reported by the UE. If the network does not successfully receive the UE capability information message, step S5 is repeated until the network successfully receives the UE capability information message. If the network successfully receives the UE capability information message, the network prepares to send an RRC reconfiguration message to the UE.
For the downlink scenario, the RRC reconfiguration message includes configuration information PDSCH-ServingCellConfig of the physical downlink shared channel PDSCH. The configuration information of the PDSCH records whether the network selects to configure the maxMIMO-relays parameter. If the network selects to configure the maxMIMO-Layers parameter in the RRC configuration message, the configuration information of the PDSCH also records that the value of the maxMIMO-Layers parameter configured by the network is M, namely, the value is equal to the maximum layer number supported by the UE. The value range of M in the downlink scene is any integer between 1 and 8 (including 1 and 8).
For the uplink scenario, the RRC reconfiguration message includes configuration information PUSCH-Config of a physical uplink shared channel PUSCH and configuration information PUSCH-ServingCellConfig of a PUSCH serving cell. The configuration information of the PUSCH serving cell records whether the network selects and configures the maxMIMO-relays parameter, and the configuration information of the PUSCH records whether the network selects and configures the maxRank parameter. If the network selects and configures the maxMIMO-relays parameter in the RRC configuration message, the configuration information of the PUSCH service cell also records that the value of the maxMIMO-relays parameter configured by the network is M, namely, the value is equal to the maximum layer number supported by the UE. If the network selects to configure the maxRank parameter in the RRC configuration message, the configuration information of the PUSCH also records that the value of the maxRank parameter configured by the network is M, namely, the value is equal to the maximum layer number supported by the UE. If the network chooses to configure the maxMIMO-Layers parameter and the maxRank parameter at the same time, the maxRank parameter is configured to have the same value M as the maxMIMO-Layers parameter according to the protocol specification, namely, the value M is equal to the maximum layer number supported by the UE. The value range of M in the uplink scene is any integer between 1 and 4 (including 1 and 4).
If the network has configured any or all of the maxMIMO-Layers parameters or maxRank parameters in the RRC reconfiguration message, step S6 is entered.
If the network does not configure the maxMIMO-Layers parameter and the maxRank parameter in the RRC reconfiguration message, the step S7 is performed.
Step S6: the network issues an RRC reconfiguration message. At this time, any one or all of the maxMIMO-dyes parameter or the maxRank parameter is configured in the RRC reconfiguration message. The UE receives the RRC reconfiguration message.
For the downlink scenario, the UE obtains a value M of a maxmmo-Layers parameter described in the PDSCH configuration information. The maximum layer number used by one transport block of the downlink shared channel by the UE is changed to min (M, 4) when the LDPC code rate is matched.
For the uplink scenario, the UE obtains the value M of the maxMIMO-Layers parameter described in the PUSCH serving cell configuration information, or the UE obtains the value M of the maxRank parameter described in the PUSCH configuration information. The maximum layer number used by one transport block of the uplink shared channel when the LDPC code rates are matched by the UE is changed to min (M, 4).
Step S7: the network issues an RRC reconfiguration message. At this time, the maxMIMO-Layers parameter is not configured in the RRC reconfiguration message, and the maxRank parameter is not configured. The UE receives the RRC reconfiguration message. The UE knows that the maximum number of layers supported by itself in this 5G NR cell is denoted as M. For the downlink scene, the UE changes the maximum layer number used by one transport block of the downlink shared channel when the LDPC code rate is matched to min (M, 4). For the uplink scene, the maximum layer number used by one transmission block of the uplink shared channel when the LDPC code rate is matched is changed into min (M, 4) by the UE.
The RRC configuration message and the RRC reconfiguration message are messages in different phases of network scheduling. The network updates the partial configuration message to the UE through the RRC reconfiguration message, which is not a retransmission of the RRC configuration message. For the maxMIMO-Layers parameter, maxRank parameter in the RRC configuration message and RRC reconfiguration message, the network may choose to be either totally unconfigured, or partially configured, or totally configured. The maxMIMO-Layers parameter is typically not configured by the network in the RRC configuration message, since the network has not yet learned the maximum number of Layers supported by the UE. In general, the network configures the maxRank parameter to have a value of 1 in the RRC configuration message. After obtaining the capability message of the UE, the network knows the maximum number of Layers supported by the UE, and configures the maxMIMO-Layers parameter and/or the maxRank parameter in the RRC reconfiguration message. This is the configuration case in most cases of existing 5G NR networks. The UE needs to update the maximum number of layers used by one transport block of the downlink (or uplink) shared channel of LDPC code rate matching according to the configuration of the network after receiving both the RRC configuration message and the RRC reconfiguration message.
Referring to fig. 6, an embodiment of a device for determining the maximum layer number of rate matching of an LDPC code according to the present application includes an access procedure processing unit 1, a configuration message issuing unit 2, a configuration message processing unit 3, and a configuration message processing unit 4. The embodiment of the device shown in fig. 6 corresponds to the embodiment one of the method shown in fig. 3.
The first access process processing unit 1 is configured to, in a process of accessing the UE to the 5G NR network, for a downlink scenario, make a maxMIMO-Layers parameter take a minimum value of 1, and calculate a corresponding reference code block length. The network adjusts the modulation order of downlink scheduling and/or the number n of physical resource blocks PRB So that the encoded code block length N is less than or equal to +.>. At this time, the maximum layer number used by one transport block of the downlink shared channel when the UE rate-matches the LDPC code is any one of 1, 2, 3, and 4. Aiming at an uplink scene, the network enables one of maxMIMO-Layers parameters or maxRank parameters to take a minimum value of 1, and calculates the corresponding reference code block length +.>. The network adjusts the modulation order of uplink scheduling and/or the number n of physical resource blocks PRB So that the encoded code block length N is less than or equal to +.>. At this time, the maximum layer number used by one transport block of the uplink shared channel when the LDPC code rates are matched by the UE is any value of 1, 2, 3 and 4.
The configuration message issuing unit 2 is configured to issue an RRC configuration message by the network after the UE accesses the 5G NR network. For the downlink scenario, the RRC configuration message describes whether the network chooses to configure the maxmmo-Layers parameter. If yes, the RRC configuration message also records that the value of the maxMIMO-dyes parameter is X. For the uplink scenario, the RRC configuration message records whether the network chooses to configure the maxMIMO-Layers parameter and the maxRank parameter. If yes, the RRC configuration message also records that the value of the maxMIMO-Layers parameter is X0 and/or records that the value of the maxRank parameter is X1. If the network has configured any or all of the maxMIMO-relays parameters or maxRank parameters in the RRC configuration message, the network is subsequently handed to the configuration message processing unit I3 for continued processing. If the network does not configure the maxMIMO-relays parameter in the RRC configuration message, and does not configure the maxRank parameter, the network is subsequently delivered to the configuration message processing unit II 4 for continuous processing.
The configuration message processing unit one 3 is configured to receive an RRC configuration message by the UE. For the downlink scenario, the UE obtains the value X of the maxMIMO-dyes parameter. The maximum layer number used by one transport block of the downlink shared channel by the UE is changed to min (X, 4) when the LDPC code rate is matched. For the uplink scenario, the UE obtains the value X0 of the maxmmo-Layers parameter or the value X1 of the maxRank parameter. The maximum layer number used by one transport block of the uplink shared channel when the LDPC code rates are matched by the UE is changed to min (X0, 4) or min (X1, 4).
The second configuration message processing unit 4 is configured to receive an RRC configuration message by the UE. For downlink scene, the network adjusts the modulation order of downlink scheduling and/or the number n of physical resource blocks PRB So that the encoded code block length N is less than or equal to. At this time, the maximum layer number used by one transport block of the downlink shared channel when the UE rate-matches the LDPC code is any one of 1, 2, 3, and 4. For the uplink scene, the network adjusts the modulation order of uplink scheduling and/or the number n of physical resource blocks PRB So that the encoded code block length N is less than or equal to +.>. At this time, the maximum layer number used by one transport block of the uplink shared channel when the LDPC code rates are matched by the UE is any value of 1, 2, 3 and 4.
Referring to fig. 7, an embodiment of the device for determining the maximum layer number of rate matching of an LDPC code according to the present application includes a pre-provisioning unit 1a, an access procedure processing unit two 1b, a configuration message issuing unit 2, a configuration message processing unit one 3, and a configuration message processing unit three 4a. The second embodiment of the device shown in fig. 7 corresponds to the second embodiment of the method shown in fig. 4.
The pre-provisioning unit 1a is used for the network and the UE to pre-provision that the maximum layer number used by one transmission block of the downlink shared channel is Z1 and the maximum layer number used by one transmission block of the uplink shared channel is Z2 when the LDPC code rate is matched. The first convention is: for all types of UEs, the network and the UE agree that Z1 is the same value and Z2 is the same value. The second convention is: if the network can know the type of the UE, Z1 of the different types of the UE respectively take values, and Z2 of the different types of the UE respectively take values. The third convention is: if the network can acquire the type of the UE, the network and the UE agree on the values of Z1 of the UE of different types, the values of Z2 of the UE of different types are respectively acquired, and the value of Z1 is the minimum number of receiving antenna ports required by the UE of the working frequency band of the cell.
The second access process processing unit 1b is configured to, in a process that the UE accesses the 5G NR network, use a predetermined Z1 maximum layer number for a transmission block of the downlink shared channel when the network and the UE are rate-matched with each other by using an LDPC code, for a downlink scenario. For the uplink scene, when the network and the UE match the LDPC code rate, the maximum layer number used by one transmission block of the uplink shared channel is Z2 which is agreed in advance.
The configuration message issuing unit 2 and the configuration message processing unit 3 are the same as those of the first embodiment. The "follow-up hand-over processing continuing" recorded by the configuration message issuing unit 2 is changed to the "follow-up hand-over processing continuing by the configuration message processing unit two 4a", and the follow-up hand-over processing continuing by the configuration message processing unit three 4a is performed.
The configuration message processing unit III 4a is used for receiving the RRC configuration message by the UE. For the downlink scene, the maximum layer number used by one transmission block of a downlink shared channel when the network and the UE are in LDPC code rate matching is Z1 which is agreed in advance. For the uplink scene, when the network and the UE match the LDPC code rate, the maximum layer number used by one transmission block of the uplink shared channel is Z2 which is agreed in advance.
In the 5G NR protocol, before the UE reports the UE capability information message, the maximum layer number of the UE for LDPC code rate matching is blurred. The application improves the method, provides a method for determining the maximum layer number used by a transmission channel when LDPC code rate matching, can effectively solve the rate matching problem encountered when terminal equipment with different capacities performs uplink and downlink transmission in a 5G NR cell, and ensures the normal use of the terminal equipment.
The above are only preferred embodiments of the present application, and are not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (8)

1. A method for determining the maximum layer number of LDPC code rate matching is characterized by comprising the following steps of;
step S1a: the network and the UE pre-define the maximum layer number used when the LDPC code rate is matched;
step S1b: in the process of accessing the UE into the 5G NR network, the maximum layer number used by the network and the UE when the LDPC code rate is matched is a preset value;
step S2: after the UE is accessed to the 5G NR network, the network transmits an RRC configuration message, wherein whether the network selects to configure a maxMIMO-Layers parameter or not is recorded; if yes, the value of the configured parameter is recorded;
if the network chooses to configure any or all parameters, step S3 is entered; otherwise, enter step S4a;
step S3: the UE receives the RRC configuration message, acquires the value of the network configuration parameter, and changes the maximum layer number used when the LDPC code rate is matched into the smaller value of the network configuration parameter and the smaller value of the network configuration parameter are 4;
step S4a: the UE receives the RRC configuration message, and the maximum layer number used by the network and the UE when the LDPC code rates are matched is a preset value.
2. The method for determining the maximum layer number of rate matching of an LDPC code according to claim 1 wherein only the maxMIMO-Layers parameter is present in the downlink scene; the uplink scene has maxMIMO-Layers parameters and/or maxRank parameters; if the maxMIMO-Layers parameter and the maxRank parameter are configured in the uplink scene at the same time, the maxMIMO-Layers parameter and the maxRank parameter are configured to be the same value.
3. The method for determining the maximum layer number of rate matching of an LDPC code according to claim 1, wherein in step S2, a maxmmo-Layers parameter is configured as selected by a network, and the value is 1; if the network selects to configure the maxRank parameter, the value is also 1.
4. The method according to claim 1, wherein in the step S1a, the network and the UE pre-define that the maximum layer number used by one transport block of the downlink shared channel is Z1 and the maximum layer number used by one transport block of the uplink shared channel is Z2 when the LDPC code rate is matched; for all types of UEs, Z1 is the same value, as is Z2.
5. The method for determining the maximum layer number of rate matching of an LDPC code according to claim 4, wherein in the step S1a, the agreed manner is changed to: z1 of different types of UE respectively take values, and Z2 of different types of UE respectively take values.
6. The method for determining the maximum layer number of rate matching of an LDPC code according to claim 4, wherein in the step S1a, the agreed manner is changed to: z1 of different types of UE respectively take values, Z2 of different types of UE respectively take values, and the value of Z1 is the minimum number of receiving antenna ports of the UE required by the working frequency band of the cell.
7. The method for determining the maximum layer number of rate matching of an LDPC code according to claim 1 or 2, wherein the step S4a further comprises the following steps;
step S5: the network receives the UE capability information message of the UE, and learns the maximum layer number supported by the UE from the UE capability information message; the network prepares to send RRC reconfiguration information to the UE, wherein whether the network chooses to configure maxMIMO-Layers parameters or not is recorded; if yes, the value of the configured parameter is recorded;
if the network chooses to configure any or all parameters, step S6 is entered; otherwise, entering step S7;
step S6: the network issues an RRC reconfiguration message; the UE receives the RRC reconfiguration message, acquires the value of the network configuration parameter, and changes the maximum layer number used when the LDPC code rate is matched into the smaller value of the network configuration parameter and the smaller value of the network configuration parameter are 4;
step S7: the network issues an RRC reconfiguration message; the UE receives the RRC reconfiguration message and changes the maximum number of layers used when the LDPC code rates are matched to the smaller of the maximum number of layers supported by the UE and 4.
8. The device for determining the maximum layer number of LDPC code rate matching is characterized by comprising a pre-stipulation unit, an access process processing unit II, a configuration message issuing unit, a configuration message processing unit I and a configuration message processing unit III;
the pre-agreed unit is used for pre-defining a maximum layer number used when the LDPC code rate is matched by the network and the UE;
the second access process processing unit is used for setting the maximum layer number used by the network and the UE when the LDPC code rate is matched to be a preset value in the process of accessing the 5G NR network by the UE;
the configuration message issuing unit is used for issuing RRC configuration messages by the network after the UE is accessed to the 5G NR network, wherein whether the network selects to configure maxMIMO-Layers parameters and maxRank parameters is recorded; if yes, the value of the configured parameter is recorded; if the network chooses to configure any or all parameters, entering a configuration message processing unit I; otherwise, entering a configuration message processing unit III;
the configuration message processing unit is used for receiving the RRC configuration message by the UE, obtaining the value of the network configuration parameter, and changing the maximum layer number used when the LDPC code rate is matched into the smaller value of the network configuration parameter and the smaller value of the network configuration parameter are used for changing the maximum layer number when the LDPC code rate is matched;
and the configuration message processing unit III is used for receiving the RRC configuration message by the UE, and the maximum layer number used by the network and the UE when the LDPC code rate is matched is a preset value.
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