RU2748852C1 - Method and device - Google Patents

Abstract

FIELD: communications.SUBSTANCE: invention relates to the field of communications.EFFECT: enabling efficient data transmission by determining a fixed position of redundancy versions RV and achieved by using information about the selected redundancy version in the user device when communicating with the base station, while the position of the redundancy version can meet one or more criteria.17 cl, 11 dwg

Description

The technical field to which the invention relates

This invention relates to a method and apparatus, and in particular, but not exclusively, to a method and apparatus that uses block coding, such as low density parity coding.

Background of the invention

A communication system can be viewed as a means that allows communication between two or more devices, such as user terminals, machine-type communication terminals, base stations, and / or other nodes, by providing communication channels for transferring information between communicating devices. The communication system can be provided, for example, by a communication network and one or more compatible communication devices. Communication may include, for example, the transmission of data for carrying messages such as voice, electronic mail (email), text messages, multimedia information and / or content data, and the like. Non-limiting examples of services provided include two-way or multi-way conversations, data or multimedia services, and access to a data network system such as the Internet.

In a wireless communication system, at least a portion of the communication occurs via wireless interfaces. Examples of wireless systems include Public Land Mobile Network (PLMN), satellite communication systems, and various wireless local area networks such as Wireless Local Area Network (WLAN). Wireless LAN technology that allows devices to connect to a data network is known as Wi-Fi. The term Wi-Fi is often used synonymously with WLAN.

Wireless systems can be divided into cells and are therefore often referred to as cellular systems. The user can access the communication system using a suitable communication device or terminal. A user communication device is often referred to as a User Equipment (UE). The communication device is provided with a corresponding signal receiving and transmitting device for providing communication, for example, providing access to a communication network or directly for communication with other users. The communications apparatus can access a carrier provided by a station, eg, a cell base station, and transmit and / or receive messages on the carrier.

The communication system and associated devices usually operate in accordance with a predetermined standard or specification that specifies what the various entities associated with the system are allowed to do and how this should be achieved. The communication protocols and / or parameters to be used for the connection are also usually defined. Examples of standardized radio access technologies include Global System for Mobile (GSM), GSM radio access network / higher data rates for the evolution of GSM (Enhanced Data for GSM Evolution, EDGE) (GSM / EDGE Radio Access Network. GERAN), Universal Terrestrial Radio Access Networks UTRAN, and evolved UTRAN (E-UTRAN). An example of a standardized communication system architecture is the Long-Term Evolution (LTE) project of the Universal Mobile Telecommunications System (UMTS) radio access technology. LTE is standardized by the Third Generation Partnership Project (3GPP). The LTE system uses an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). Further development of the LTE system is sometimes referred to as an advanced LTE system (LTE-Advanced, LTE-A).

The essence of the invention

According to one aspect of the present invention, there is provided a method comprising: using one or more of a set of redundancy versions, wherein the positions of said redundancy versions in a buffer used in block coding satisfy one or more of the following criteria: distance between a starting position of a third redundancy version RV2 and the start position of the fourth redundancy version RV3 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2; the distance between the start position of the second redundancy version RV1, the start position of the third redundancy version RV2 or the start position of the fourth redundancy version RV3 and the start position of the corresponding previous sequential redundancy version is increased; the starting position of the second redundancy version RV1, the third redundancy version RV2 and / or the fourth redundancy version RV3 is outside the systematic bit area of said buffer; and the distance between the start position of the first redundancy version RV0 and the start position of the second redundancy version RV1 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2, and than the distance between the start position of the third redundancy version RV2 and the start position of the fourth version redundancy RV3.

The method may comprise determining the starting position of the coded bits from the buffer according to the corresponding one of said redundancy versions.

The method may comprise one of receiving and initiating transmission of coded bits according to a corresponding one of said redundancy versions.

The corresponding starting position of redundancy versions in a set of redundancy versions can be fixed.

A redundancy version set can contain four redundancy versions.

The buffer can be a circular buffer.

The method may comprise receiving information about the index of the redundancy version, and depending on the information about the index of the version of the redundancy, using the corresponding version of the redundancy.

The method can include receiving configuration information to determine criteria that the corresponding redundancy versions meet.

The buffer may contain a first area containing systematic bits to be transmitted and a second area containing parity bits to be transmitted.

The first, second and third versions of redundancy can be located in the aforementioned first area.

The fourth version of redundancy can be located in the second area.

The second, third and fourth versions of redundancy can be located in the mentioned second area.

The first version of redundancy can be located in the first area.

The fixed redundancy positions can be selected based on the starting position of at least the second gear.

This can be subject to serial transmission.

The method can be implemented on a user device.

The method can be implemented in a base station device.

According to another aspect of the present invention, there is provided a method comprising: using one or more of a set of redundancy versions, wherein the positions of said redundancy versions in a buffer used in block coding satisfy the following criteria: distance between the start position of the third redundancy version RV2 and the start position of the fourth version the redundancy version RV3 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2.

According to another aspect, a method is proposed, including: using one or more of a set of redundancy versions, wherein the positions of said redundancy versions in a buffer used in block coding satisfy the following criteria: distance between a second RV1 start position, a third RV2 start position, or a start position the fourth version of the redundancy RV3 and the starting position of the corresponding previous sequential version of the redundancy is increased.

According to another aspect, a method is proposed, including: using one or more of a set of redundancy versions, wherein the positions of said redundancy versions in the buffer used in block coding satisfy the following criteria: the starting position of the second redundancy version RV1, the third redundancy version RV2 and / or the fourth version of the redundancy RV3 are outside the systematic bit area of the said buffer.

According to another aspect, a method is proposed, including: using one or more of a set of redundancy versions, wherein the positions of said redundancy versions in the buffer used in said block coding satisfy the following criteria: distance between the starting position of the first redundancy version RV0 and the starting position of the second version the redundancy version RV1 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2, and the distance between the start position of the third redundancy version RV2 and the start position of the fourth redundancy version RV3.

According to another aspect, a method is proposed using one or more of a set of redundancy versions, wherein the positions of said redundancy versions in a buffer used in said block coding are such that most of said redundancy version positions are in one of the buffer regions having systematic bits to be transferred.

According to another aspect, a method is provided using one or more of a set of redundancy versions, wherein the positions of said redundancy versions in a buffer used in said block coding are such that most of said redundancy version positions are in one of the buffer regions having parity bits, to be transferred.

In another aspect, a method is provided, comprising: selecting, at a base station, a redundancy version based on a last transmission end position for an information block; and provide information about said selected version of redundancy to the user device.

The information may contain an index.

According to another aspect, a method is provided, including: receiving information about a selected redundancy version in a user device, said redundancy version being associated with block coding; and using said information when communicating with a base station.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: use one or more of a set of redundancy versions, wherein the positions of said redundancy versions in the buffer used in block coding satisfy one or more of the following criteria: the distance between the start position of the third redundancy version RV2 and the start position of the fourth redundancy version RV3 is greater, than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2; the distance between the start position of the second RV1, the start position of the third RV2 or the start position of the fourth redundancy version RV3 and the start position of the corresponding previous sequential redundancy version is increased; the starting position of the second redundancy version RV1, the third redundancy version RV2 and / or the fourth redundancy version RV3 is outside the systematic bit area of said buffer; and the distance between the start position of the first redundancy version RV0 and the start position of the second redundancy version RV1 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2, and than the distance between the start position of the third redundancy version RV2 and the start position of the fourth version redundancy RV3.

The at least one memory and computer code can be configured to, together with at least one processor, determine the starting position of the coded bits from the buffer according to one of the redundancy versions mentioned.

At least one memory device and computer code may be configured to perform, in conjunction with at least one processor, receiving or initiating transmission of coded bits according to a corresponding one of said redundancy versions.

The device can be located in the base station.

The device can be located on a user device.

The corresponding starting position of redundancy versions in a set of redundancy versions can be fixed.

A redundancy version set can contain four redundancy versions.

The buffer can be a circular buffer.

The at least one memory and computer code may be configured to perform, in conjunction with the at least one processor, receiving the redundancy version index information and, depending on said redundancy version index information, use the corresponding redundancy version.

The at least one memory and computer code may be configured to, in conjunction with the at least one processor, receive configuration information to determine criteria that the respective redundancy versions meet.

The buffer may contain a first area containing systematic bits to be transmitted and a second area containing parity bits to be transmitted.

The first, second and third versions of redundancy can be located in the aforementioned first area.

The fourth version of redundancy can be located in the second area.

The second, third and fourth versions of redundancy can be located in the mentioned second area.

The first version of redundancy can be located in the first area.

The fixed redundancy positions can be selected based on the starting position of at least the second gear.

This can be subject to serial transmission.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: use one or more of a set of redundancy versions, while the positions of said redundancy versions in the buffer used in block coding satisfy the following criteria: the distance between the start position of the third redundancy version RV2 and the start position of the fourth redundancy version RV3 is greater than the distance between the initial the position of the second version of the redundancy RV1 and the starting position of the third version of the redundancy RV2.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: use one or more of a set of redundancy versions, where the positions of said redundancy versions in the buffer used in block coding satisfy the following criteria: the distance between the start position of the second RV1, the start position of the third RV2 or the start position of the fourth version of the redundancy RV3 and the start position of the corresponding the previous sequential version increases redundancy.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: use one or more of a set of redundancy versions, wherein the positions of said redundancy versions in the buffer used in block coding meet the following criteria: the starting position of the second redundancy version RV1, the third redundancy version RV2 and / or the fourth redundancy version RV3 is outside the range the area of systematic bits of said buffer.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: use one or more of a set of redundancy versions, where the positions of said redundancy versions in the buffer used in said block coding satisfy the following criteria: the distance between the start position of the first redundancy version RV0 and the start position of the second redundancy version RV1 is greater than the distance between the initial the position of the second redundancy version RV1 and the starting position of the third redundancy version RV2 and than the distance between the starting position of the third redundancy version RV2 and the starting position of the fourth redundancy version RV3.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: use one or more of a set of redundancy versions, wherein the positions of said redundancy versions in the buffer used in said block coding are such that most of the said redundancy version positions are in one of the buffer regions having systematic bits to be transmitted.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: use one or more of a set of redundancy versions, wherein the positions of said redundancy versions in the buffer used in said block coding are such that most of the said redundancy version positions are in one of the buffer regions having parity bits to be transmitted.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: select a redundancy version at the base station based on the last transmission end position for the information block; and provide information about said selected redundancy version to the user device.

The information may contain an index.

According to another aspect, an apparatus is provided, comprising: at least one processor and at least one memory containing a computer program code, wherein the at least one memory and computer program code are configured to, together with at least one processor, cause device: receive information about the selected version of the redundancy in the user device, and said version of the redundancy associated with block coding; and use said information when communicating with the base station.

A communication device and / or system may also be provided comprising a device configured to provide at least one embodiment of the invention. The device may comprise a communication device such as user equipment or other wirelessly capable node or network node.

A computer program may also be provided containing program code means for performing the methods described herein. In accordance with additional embodiments of the invention, an apparatus and / or computer program product is provided that may be embodied on a computer-readable medium to provide at least one of the aforementioned methods.

Various other aspects and additional embodiments of the invention are also described in the following detailed description of examples embodying the invention and in the appended claims.

Brief Description of Drawings

Certain embodiments of the invention will now be described in more detail, by way of example only, with reference to the following examples and the accompanying drawings, in which:

FIG. 1 is a schematic diagram of an example of a system in which the invention may be implemented.

FIG. 2 shows an example of a communication device.

FIG. 3 shows an example of a circular buffer in the LTE system.

FIG. 4 shows an example of a first embodiment of a circular buffer in an LTE system.

FIG. 5 shows an example of a second embodiment of a circular buffer in an LTE system.

FIG. 6 shows a method for determining the position of redundancy versions.

FIG. 7 shows an example of a device.

FIG. 8 shows a method for transmitting Redundancy Version (RV) information from a base station to a UE.

FIG. 9 shows the Cumulative Distribution Function (CDF) for the start position of the second RV retransmission (s).

FIG. 10 shows a cumulative distribution function (CDF) for the start position of the second and third RV retransmission (s).

FIG. 11 shows a cumulative distribution function (CDF) for the starting position of the second, third and fourth RV retransmission (s).

Detailed description of the forms of implementation of the invention

Before explaining examples in detail, some general principles of a wireless communication system and mobile communication devices are briefly explained with reference to FIG. 1-2 to help you understand the technology behind the described examples.

In a wireless communication system 100, such as that shown in FIG. 1, wireless communication devices or UEs 102, 104, 105 are provided wireless access via at least one base station or similar wireless transmitting and / or receiving node or point. The base stations are typically controlled by at least one suitable controller to operate and control mobile communication devices when communicating with the base stations. The controller can be located in a radio access network (eg, wireless communication system 100) or in a Core Network (CN) (not shown) and can be implemented as a single central device, or its functionality can be distributed across multiple devices. The controller can be part of the base station and / or be a separate entity such as a Radio Network Controller (RNC). FIG. 1 shows control devices 108 and 109 for controlling respective macro base stations 106 and 107. The base station control unit can be associated with other control objects. The control device is usually provided with a memory and at least one data processor. The control unit and functions can be distributed among multiple control units. In some systems, the control unit may additionally or alternatively be located in the radio network controller.

Below, a possible wireless communication device will be described in more detail with reference to FIG. 2, a schematic partial sectional view of a communications device 200 is shown. Such a communication device is often referred to as a user equipment (UE) or terminal. A suitable mobile communication device can be any device capable of sending and receiving radio signals. Non-limiting examples include a Mobile Station (MS) or mobile device such as a mobile phone or a so-called "smartphone", a computer equipped with a wireless interface card or other wireless interface (such as a Universal Serial Bus , USB) (USB dongle)), Personal Data Assistant (PDA) or wireless tablet, or any combination thereof, and the like. The mobile communication device can provide, for example, data transmission for carrying messages such as voice message, electronic mail (email), text message, multimedia information, and the like. Thus, multiple services can be offered and provided to users through their communication devices, and one or more applications can be run on the MS requiring data transfer between the MS and the network. Non-limiting examples of these services include two-way or multi-way conversations, data transmission or multimedia services, or simply access to a network data transmission system such as the Internet. Users can also be provided with broadcast or multicast data transmission. Non-limiting examples of content include downloads, TV and radio programs, videos, advertisements, games, various alerts, and other information.

Mobile device 200 can receive signals over the air or radio interface 207 through a suitable receiving device, and can transmit signals through a suitable radio transmission device. FIG. 2, the transceiver is schematically indicated by a block 206. The transceiver 206 may comprise, for example, a radio communication unit and a corresponding antenna system. The antenna system can be located inside or outside the mobile device.

The mobile device is usually provided with at least one data processing object 201, at least one memory 202 and other possible components 203 for use in software and hardware to perform the tasks for which it is intended, including access control and communication with access systems and others. communication devices. The device for processing, storing data and other appropriate data management can be implemented on a suitable board and / or in sets of integrated circuits. This component is designated by the reference number 204. The user can control the operation of the mobile device through a suitable user interface such as a keyboard 205, voice commands, a touch screen or tablet, combinations thereof, and the like. A display 208, loudspeaker and microphone may also be provided. In addition, the wireless device may contain appropriate connectors (wired or wireless) with other devices and / or for connecting external accessories such as hands-free equipment.

Communication devices 102, 104, 105 can access the communication system based on various access technologies such as Code Division Multiple Access (CDMA) or Wideband CDMA (WCDMA). Other non-limiting examples include Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), and various schemes such as Interleaved Frequency Division Multiple Access, IFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA) and Orthogonal Frequency Division Multiple Access (OFDMA), Space Division Multiple Access ( Space Division Multiple Access, SDMA) and the like. Additional non-limiting examples include examples based on the specifications of the organization, the Third Generation Partnership Project (3GPP). Some embodiments of the invention can be applied in the advanced technology LTE Advanced - 3GPP LTE-Advanced Pro, which will be part of the 15th version (Release-15, Rel-15) of the 3GPP LTE standard. Of course, other forms of implementation of the invention can be applied in the context of other standards. The base station is referred to as enhanced NodeB (eNodeB, eNB) in the context of the LTE system and the Next Generation NodeB (gNB) in the context of the 5th Generation (5G) system.

FIG. 7 shows an example of an apparatus 700 installed in or associated with a base station as shown in FIG. 1. The device comprises at least one memory 701, at least one data processing unit, or at least one data processor 702, 703 and an input / output interface 704. Through the interface, the device can be connected to the receiver and transmitter of the base station.

Hybrid Automatic Repeat Request (HARQ) technology can be used to meet reliability requirements in wireless communication systems.

Existing wireless communication standards (eg, LTE system, etc.) use HARQ technology, transmitting a feedback signal for each Transmit Block (TV) received at the receiver. In the context of the LTE system, an Acknowledged / Non-Acknowledged (ACK / NACK) feedback signal is transmitted for each Transport Block (TB) and 1 to 2 bits are used to indicate whether the received TB block (s) is erroneous or not. Feedback bits of ACK / NACK information are transmitted with Uplink Control Information (UCI) for format 1a / 1b. In case of carrier aggregation, more feedback bits are used in the ACK / NACK information for multiple carriers and transmitted on the Primary Component Carrier (PCC). In particular, the ACK / NACK information may use UCI information format 3 or channel selection format 1b.

In LTE, the definition of redundancy versions (RVs) provides the freedom to choose the bits for retransmission and may not increase the complexity of decoding. In the LTE system, 4 RV redundancy versions can be defined, where 4 RV redundancy versions (0, 1, 2, 3) can be evenly spaced with a turbo base rate 1/3, where RV ₀ starts with the first systematic bit that is not punctured.

High data rates are expected in the 5G system. Large bandwidth and efficient transmission schemes can be used in 5G systems, resulting in significant increases in data rates, especially for the enhanced Mobile Broadband (eMBB) scenario. The requirement for a high 5G data rate can increase the TV block size. Thus, the transmission block size will become larger for transmissions of longer packets. Low Density Parity Check (LDPC) codes can be used for channel coding because of their good efficiency and low implementation complexity. For example, the LDPC code can be used to support the eMBB access scenario in 5G systems. LDPC code has implicit error detection capability, and Code Block (CB) errors in LDPC can be implicitly detected without a Cycling Redundancy Check (CRC). Thus, the LDPC coding scheme can support finer ACK / NACK feedback.

For the Low Density Parity Check (LDPC) code in the New Radio (NR) standard, the definition of the redundant RV version may differ from that in the LTE turbo code standard. The turbo code is a convolutional code and decoding is always done at rate 1/3, where another parity bit also affects the efficiency and complexity of the decoding.

For an LDPC code, the Parity-Check Matrice (PCM) are different for different rates. For example, the PCM for lower speeds can typically be an enhanced version of the higher speed PCM. The complexity and delay of decoding for a PCM with a higher code rate will be lower than the complexity and delay for a PCM with a lower code rate.

Accordingly, when the parity bits corresponding to the lower or higher code rate portion of the PCM are used, the lower or higher code rate PCM should be used respectively for decoding it since they have different decoding difficulties. In addition, the parity bits corresponding to the higher code rate PCM generally provide more support and better error correction gain than the parity bits corresponding to the lower code rate PCM.

In the context of rate negotiation for eMBB access, embedded systematic bit puncturing for LDPC coding has been proposed. For example, for an initial transmission, at least the coded bits may be taken after skipping the first systematic bits (N _{sys, punct} ), where N _{sys, punct} is selected from: 0, Z and 2 * Z. Z is the lifting value of the matrix for quasi-cyclic LDPC codes.

The rate negotiation for the LDPC code is based on a circular buffer. This may be similar to the concept used in the LTE system. The circular buffer can be filled with an ordered sequence of systematic and parity bits.

For Incremental Redundancy HARQ (IR-HARQ), each RV redundancy version (RV _i ) may be assigned an initial location of the S _i bit in the circular buffer.

To retransmit RV _i with Incremental Redundancy (IR), the coded bits are read sequentially from the circular buffer, starting at the bit location.The transmitter can transmit different versions of the packet / PDU redundancy (RV), which can include the same data bits. but different parity bits (or different number of parity bits). With incremental redundancy, each version of the redundancy contains different information: a different set of coded bits formed from the bits of the original data. Each individual set is called a redundancy version (RV) such as RV0, RV1, RV2, RV3.

Each transmission may start from the starting position of one RV redundancy version selected from a set of RV redundancy versions. The different redundancy versions of the PDU may be referred to as redundancy version 0 (RVO), RV1, RV2, RV3, etc. For example, the initial transmission of a PDU or TB unit can be transmitted from the start position of redundancy version 0 (RV0), while a subsequent retransmission of a PDU or TB unit can be transmitted from the start position of another RV, for example, RV1 , RV2, RV3, according to an example implementation, where each redundancy version contains a different set of coded bits. A transport block (TB) may contain a coded PDU including both information bits and parity bits. For example, a Media Access Control Protocol Data Unit (MAC PDU) may be encoded (including both data bits and parity bits) as a transport unit (TB) and may be sent as RV0 of the PDU. Another version of the redundancy (eg RV1, RV2, RV3) of the PDU can be sent as retransmission.

Limited Buffer Rate Matching (LBRM) can be supported.

It has been proposed that the number of RV redundancy versions is always 4. In other embodiments of the invention, a different number of RV redundancy versions may be applied.

It has been proposed that the RV redundancy versions are in fixed locations in the circular buffer. In other embodiments, the locations may vary depending on one or more factors. For example, the locations may depend on the state of the channel.

In some embodiments of the invention, the fixed locations are the same for all code rates. However, in other embodiments of the invention, the fixed locations may depend on the code rate. In other embodiments of the invention, the fixed locations may depend on a set of code rates.

It has been suggested that RV # 0 be self-decoding.

It has been proposed that the first 2Z systematic bits to be punctured should not be inserted into the circular buffer. In other embodiments of the invention, some or all of the 2Z punctured bits may be inserted into a circular buffer.

Support for sequential transmission (sequential transmission means that each retransmission starts from the end of the last transmission) in determining the RV redundancy version can be useful, for example, for better efficiency. Serial transmission can provide better performance than LTE-like equally spaced and fixed versions of RV redundancy. Serial transmission can be supported in determining RV redundancy versions, taking into account the different contributions of coded parity bits to the LDPC code for complexity and efficiency. However, this can create problems as it can create incompatibility between the UE and the eNB in understanding the retransmission starting positions for serial transmission.

It has been proposed that the 5G LDPC code uses four fixed RV positions.

When 4 fixed RV positions are used, in the LTE system, the RV positions can be predetermined and the RV positions can be evenly spaced in the coded block for the lowest supported code rate.

For example, in FIG. 3 shows one cycle of circular buffer 305 that is filled with systematic bits 301 to be transmitted, followed by parity bits 303. The bits in the circular buffer are defined by different versions of redundancy (RV), that is, RV0 311, RV1 313, RV2 315 and RV3 317, which are equally spaced from the starting points RV0 311 and RV1 313 in the systematic bits 301 and the starting points RV2 315 and RV3 317 located in the parity bits 303.

When 4 fixed RV positions are used in LDPC coding, for large code block sizes, the supported minimum code rate may be 1/3. As for the PCM matrix, the initial position of the RV redundancy versions for large block size cases can be 2 * z, 18.5 * z, 35 * z, 51.5 * z, where z is the lifting value of the matrix, and the PCM matrix for the code rate 1/3 - a matrix with the size 46 * 68. The first 2z systematic bits to be punctured may not be inserted into the circular buffer.

To ensure good performance, it is necessary to define a fixed position of the RV redundancy versions. For example, you need to define the starting positions RV1, RV2 and RV3.

Some embodiments of the invention provide a method and apparatus for determining the position of RV redundancy versions in fixed positions using one or more of the following properties:

- The distance between the starting point of RV2 and RV3 is greater than the distance between the starting point of RV1 and RV2.

- The distance from the starting point of RV1, RV2 and RV3 to the corresponding starting point of the previous RV gradually increases (ie the distance RV3RV2> RV2RV1> RV1RV0).

- The start position for the start point RV1, RV2 and / or RV3 is outside the systematic bit area 301.

- The distance between the starting point RV0 and RV1 is greater than the distance 1) between the starting point RV1 and RV2 and 2) between the starting point RV2 and RV3.

Typically, retransmissions can use the same resource size and modulation order as the first transmission. Although the actual size of the retransmission resource may be greater or less than the first transmission, the average size of the retransmission resource may be the same as for the first transmission, since it is likely that the channel state will not change much in a short time. time between first transmission and retransmission.

In some embodiments, the PCM matrix for the lowest code rate may be a 46 * 68 matrix, where the first 2Z systematic bits to be punctured may not be inserted into the circular buffer. Of course, other embodiments of the invention may use a different matrix size and / or the first 2Z of the systematic bits to be punctured may be inserted into a circular buffer. In some embodiments, the systematic bits may not be punctured.

For LDPC codes, the parity bits generated by the higher weight rows in the PCM matrix and the parity bits generated by the lower weight rows in the PCM matrix may have different priorities. The higher the line weight to which the parity bits correspond, the higher the priority the parity bits can have, since the efficiency gains provided by these parity bits can be greater.

In order to provide a higher probability of selecting high priority parity bits in retransmission, the RV distance between 4 fixed RV starting positions can be progressively reduced.

In a first embodiment, for a block code (e.g., LDPC) with fixed RV start positions, the RV redundancy version with a start position closer to the start position of the circular buffer may have a shorter distance with respect to the start position of the next RV, for example, the distance between the starting positions RV0 and RV1 can determine the subsequent distance between the starting positions RV1 and RV2. Therefore, a smaller distance between the starting positions of RV0 and RV1 creates a smaller distance between the starting positions of RV1 and RV2. For example, in FIG. 4, the start position of RV0 311 is on the boundary of the systematic bit area to be transmitted, the start position of RV1 413 is within the systematic bit area to be transmitted, and the start position of RV2 415 may be on the boundary of the systematic bit area 301 to be transmitted and the area 303 parity bits. These densely packed versions of RV redundancy can provide a higher retransmission probability from a bit that can have a higher priority. This definition can provide a dense RV-like effect for the high priority bit range. The starting position of the RV3 417 is in the parity bit area 303.

As shown in FIG. 4, the distance between the starting positions of the RV redundancy versions can be gradually increased, so that the distance between the starting positions of RV3 417 and RV2 415 may be greater than the distance between the starting positions of RV2 415 and RV1 413, which may in turn be greater than the distance between the starting positions RV1 413 and RV0 311 (i.e. RV3RV2> RV2RV1> RV1RV0). Such determination of RV redundancy versions can provide a dense RV-like effect for a range of high priority bits in all coded codes.

Referring now to FIG. 5, which shows a second embodiment of a circular buffer (305) of a block code (eg, LDPC). In the second embodiment, the starting position of all redundancy versions RV 513, 515, 517, with the exception of RV0 311, may be in the parity-bit region 303 of the circular buffer 305. The distance between the starting position of RV1 513, RV2 515 and RV3 517 may gradually increase (i.e. i.e. RV3RV2> RV2RV1). However, the start position RV0 may have the greatest distance from the start position RV1 since it is at the beginning of the systematic bit area 301 to be transmitted. Thus, the increasing distance distance of the RV redundancy versions can only be within the set {RV1, RV2, RV3}. This definition of RV redundancy versions can provide a dense RV-like effect for a range of high priority bits in the 303 parity area.

In addition, it can be seen that in this example, the distance between the start position of the first redundancy version RV0 and the start position of the second redundancy version RV1 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2 and the distance between the start position of the third version. redundancy RV2 and the starting position of the fourth version of redundancy RV3.

In addition, it can be seen that in this example, the starting positions of the second redundancy version RV1, the third redundancy version RV2 and / or the fourth redundancy version RV3 are outside the systematic bit area.

In a system using HARQ technology, the scheduler can ensure that the first transmission (initial transmission) success rate can be approximately 90% (slightly lower in some cases). The second transmission (first retransmission) success rate may subsequently reach a success rate of about 99%. Success rates for subsequent third and / or fourth transmissions may then reach success rates that are around 100%. Therefore, the first transmission is of the highest importance, the second transmission will be of the second highest importance, and the subsequent third and fourth transmissions will be of even lower importance. The starting position of the first transmission can always be from RV0 311, that is, from the first bit to be transmitted. It is advisable to design the starting position of RV1, RV2 and RV3 according to the relative importance of retransmissions.

In some embodiments, the fixed RV positions are selected based on the second transmission start position (RV1 start position) for all possible different code rates when the same resource size is used for each information block transmission.

Referring now to FIG. 6, which shows a method for determining fixed starting positions of RV redundancy versions. In particular, the starting position of the RV may be fixed if the criteria are met in one or more of the steps shown in FIG. 6.

It should be understood that this method can be performed by a network element such as an access point while the network is in operation. Alternatively or additionally, the method can be used during network configuration or during network reconfiguration.

In step 601, it is determined whether the distance between the starting positions RV2 and RV3 is greater than the distance between the starting positions RV1 and RV2.

In step 603, it is determined whether the distance between the starting position of RV1, RV2, and RV3 is gradually increased relative to the corresponding previous RV (i.e., the distance RV3RV2> RV2RV1> RV1RV0).

In step 605, it is determined whether the start position for RV1, RV2 and / or RV3 is outside the systematic bit area 301.

In step 607, it is determined whether the distance between the starting position RV0 and RV1 is greater than the distance 1) between the starting position RV1 and RV2 and 2) between the starting position RV2 and RV3.

The eNB may select the RV based on the embodiments presented herein, in accordance with the final position of the last transmission for the information block. The eNB can then configure the RV index for the UE. The UE may then transmit or receive transmissions based on the RV definition and the eNB's configuration.

Embodiments herein provide that the selected start positions for RV1, RV2, and RV3 can create a circular buffer that can be similar to sequential transmission when considering the RV positions of all code rates in a serial transmission, providing suitable retransmitted coded bits on retransmission ( -Oh).

Such determination of the starting position of the RV redundancy versions can also provide a dense RV-like effect for the high priority bit range.

For example, for fixed RV start positions, by accumulating the second gear start position (RV1 start position) for all possible code rates (for example, 0.33 to 0.94 in 0.01 increments) assuming a serial transmission (this serial transmission means that each retransmission starts at the end of the last transmission), a cumulative distribution function (CDF) can be derived.

CDF can be network wide. In some embodiments, the CDF may be predefined and included in the standard.

FIG. 9 shows a cumulative distribution function (CDF) for the start position of the second retransmission (s) for all possible code rates with respect to the column index of the start position of the RV redundancy versions in the sequential transmission hypothesized buffer ring. Selecting points on the CDF at 25%, 50% and 75% for the starting positions RV1, RV2 and RV3 can result in column index values of 29.5 * z, 35.85 * z, 46 * z for the starting positions RV1, RV2, and RV3 , respectively. These values are provided as an example only and are based on one example.

These values represent the column index of the starting position of the RV redundancy versions in the circular buffer. For example, the size of the ring buffer can be 68 * z, where z is the matrix lift size for quasi-cyclic LDPC. A different size of the circular buffer can be used in other embodiments of the invention. The column index of the starting position is defined as the number multiplied by z.

Thus, for one transmission at one particular code rate (i.e., RV0), the closest position (e.g. RV1) and / or the closest but later position for retransmission will be selected from {RV1, RV2, RV3} to provide effect similar to serial transmission. Sequential transmission means that each retransmission starts from the end of the last transmission. In some embodiments, there will only be 4 fixed starting positions pre-defined for the RV redundancy versions. Based on this method, for each code rate, the retransmission start position can be selected from a predetermined fixed start position of the RV redundancy versions. Although not the same as sequential transmission, considering all possible code rates, the distance to the position for sequential transmission will be less than for equally spaced versions of RV redundancy.

You can see that in this example and the following two examples, the starting position of the RV redundancy versions meets the following criteria:

the distance between the start position of the third redundancy version RV2 and the start position of the fourth redundancy version RV3 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2;

the starting position of the second redundancy version RV1, the third redundancy version RV2 and / or the fourth redundancy version RV3 is outside the systematic bit area; and

the distance between the start position of the first redundancy version RV0 and the start position of the second redundancy version RV1 is greater than the distance between the start position of the second redundancy version RV1 and the start position of the third redundancy version RV2, and than the distance between the start position of the third redundancy version RV2 and the start position of the fourth redundancy version RV3.

In another similar example, for fixed RV positions, a cumulative distribution function (CDF) can be derived by accumulating the starting position of the second and third gears for all possible code rates, assuming a sequential transmission and assuming the same resource size for each transmission of an information block. Again, selecting points on the CDF of 25%, 50%, and 75% for the starting position of RV1, RV2, and RV3 can result in column index values for starting position RV1, RV2, and RV3 of 28.19 * z, 39.93 * z, 53.76 * z, respectively. FIG. 10 shows a cumulative distribution function (CDF) for the start position of the second and third retransmission (s) for all possible code rates with respect to the column index of the start position of the RV redundancy versions in the sequential-assumed circular buffer.

In the last similar example, for fixed RV positions, based on the starting position of the second, third and fourth transmissions of all possible code rates, assuming sequential transmission and assuming the same resource size for each transmission of an information block, a cumulative distribution function (CDF) can be derived. Again, selecting points on the CDF at 25%, 50%, and 75% for the starting position of RV1, RV2, and RV3 can result in column index values for the starting positions RV1, RV2, and RV3 24 * z, 35.85 * z 51.79 * z, respectively.

In some embodiments, the starting position definitions for RV redundancy versions may be for each base graph and / or for the base graph type. Here, multiple base graphs or multiple types of base graphs can support different minimum code rates. Thus, the starting positions for the RV redundancy versions for each base graph or for each type of base graph can be determined based on the supported minimum code rate of the base graph. For example, 5G can use 2 base graphs for LDPC, for example, the first base graph can be used for initial transmission and subsequent retransmissions of the same TV block when the code block size (CBS)> X or the code rate of the initial transmission> Y, and the second base graph may be used for initial transmission and subsequent retransmissions of the same TB block when the code block size (CBS) ≤ X and the initial transmission code rate ≤ Y, for example, where X = 2560 and Y = 0.67.

FIG. 11 shows a cumulative distribution function (CDF) for the start position of the second, third and fourth retransmission (s) for all possible code rates with respect to the index of the start position column of the RV redundancy versions in the sequential-assumed circular buffer.

In some embodiments of the invention, the starting position of the RV redundancy versions is fixed. In some embodiments of the invention, the base station will configure the RV index in the control information that is provided to the UE. Then, the UE will know the starting position for retransmission according to the fixed starting position of the configured RV index. The UE can transmit or receive based on the RV definition and the base station configuration.

Some embodiments of the invention may use a procedure similar to that proposed for the LTE system.

The UE and the base station may use the same fixed starting positions for the RV redundancy versions. In other embodiments of the invention, the UE and the base station may use different fixed starting positions for the RV redundancy versions.

In some embodiments, the UE identifies the start position of the coded bits from the circular buffer according to the RV and then transmits or receives coded bits from the eNB according to the RV.

The base station can configure the UE as to which criteria the RV meets. The base station can configure criteria parameters or parameters to generate criteria.

The criteria parameters can be, for example, one or more code rates that are used to generate the starting position of the RV redundancy versions, assuming sequential transmission, the number of retransmissions, which is used to generate the starting position of the RV redundancy versions, assuming sequential transmission.

These parameters can be found in the example CDFs described above with a different set of coding rates and / or the number of retransmissions used to generate the start position of RV redundancy versions that can generate different start positions.

FIG. 8 shows a method for transmitting RV information from a base station to a UE. In step 801, the base station transmits the RV information to the UE. Then, in step 803, the UE uses the RV information it received in step 801 to control transmissions. This RV information can be an RV index.

In some embodiments, a different number of RV redundancy versions may be applied than the four presented in the previous examples.

It has been suggested that RV redundancy versions always be at the same fixed locations in the circular buffer. In other embodiments, the locations may vary depending on one or more factors. For example, the locations may depend on the state of the channel.

In some embodiments of the invention, the fixed locations are the same for all code rates. However, in other embodiments of the invention, the fixed locations may depend on the code rate.

In some embodiments, the fixed locations may be the same for the UE and the base station. In other embodiments of the invention, the fixed locations may be different for the UE and the base station.

In some embodiments, the number of fixed sites may be the same for the UE and the base station. In other embodiments of the invention, the number of fixed sites may be different for the UE and the base station.

In some embodiments, the same set of RV positions may be defined for all code rates. In other embodiments, many different sets of RV positions may be defined. In some embodiments, at least one or more sets of RV positions may satisfy one or more of the previously described criteria. In some embodiments of the invention, all sets of RV positions may meet one or more of the previously defined criteria.

Embodiments of the invention have been described in the context of LPDC coding. It should be understood that other embodiments of the invention may be used with any other suitable block code.

It should be noted that the problems discussed above are not limited to any particular communication medium, but can occur in any suitable communication system.

The required device and data processing functions may be implemented by one or more data processors. The features described can be provided by separate processors or by an embedded processor. Data processors can be of any type suitable for the local technical environment and can include one or more general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs), Specific Integrated Circuits (ASICs). ), gates and processor-level circuits based on multi-core processor architectures, as non-limiting examples. Data processing can be distributed over several data processing modules. The data processor can be provided, for example, by means of at least one integrated circuit. An adequate amount of memory can be provided in the appropriate devices. The memory or memory units can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology such as semiconductor based memories, magnetic memory devices and systems, optical memory devices and systems, fixed storage devices and removable storage devices. One or more of the steps discussed in connection with FIG. 8 may be executed by one or more processors in combination with one or more memory devices.

Appropriately adapted computer program code product or products may be used to implement embodiments of the invention when downloaded or otherwise provided in a suitable data processing device. The product of the software code to support the operation may be stored, provided, and implemented through an appropriate storage medium. The corresponding computer program can be implemented on a computer-readable recording medium. It is possible to download the program code of the product via the data network. In general, various forms of implementation of the invention may be implemented in hardware or special circuits, software, logic, or any combination thereof. Thus, embodiments of the invention can be applied to various components such as integrated circuit modules. Integrated circuit design is generally a highly automated process. Sophisticated and powerful software tools are available to transform a logic-level design into a semiconductor circuit design, ready for etching and shaping on a semiconductor substrate.

It should be noted that although embodiments of the invention have been described with respect to certain architectures, similar principles may apply to other systems. Therefore, while certain embodiments of the invention have been described above by way of example with reference to some illustrative architectures for wireless networks, technologies and standards, the embodiments of the invention may be applied to any suitable form of communication systems other than those illustrated and described herein. ... Various combinations of different forms of implementation are also possible. It is also noted here that while the foregoing describes exemplary embodiments of the invention, there are several variations and modifications that can be made to the disclosed solution without departing from the spirit and scope of the present invention.

Claims (32)

1. A method for obtaining information about the redundancy version, including: receiving, from the base station, redundancy version information for the data block; and using, based on the received information about the redundancy version, at least one redundancy version from the set of redundancy versions for transmitting said data block to the base station, wherein said set of redundancy versions contains redundancy versions RV0, RV1, RV2 and RV3, with the initial positions of said versions of redundancy in the buffer used in the block coding of said data block satisfy one or more of the following criteria: the distance between the start position of the redundancy version RV2 and the start position of the redundancy version RV3 is greater than the distance between the start position of the redundancy version RV1 and the start position of the redundancy version RV2; the distance between the start position of the redundancy version RV1, the start position of the redundancy version RV2 or the start position of the redundancy version RV3 and the start position of the corresponding previous sequential redundancy version is increased; the starting position of the redundancy version RV1, the redundancy version RV2 and / or the redundancy version RV3 is outside the systematic bit area of said buffer; and the distance between the start position of the redundancy version RV0 and the start position of the redundancy version RV1 is greater than the distance between the start position of the redundancy version RV1 and the start position of the redundancy version RV2 and than the distance between the start position of the redundancy version RV2 and the start position of the redundancy version RV3. 2. The method according to claim 1, comprising determining the starting position of the coded bits from the buffer according to the corresponding one of said redundancy versions. 3. A method according to claim 2, comprising receiving or initiating transmission of the coded bits in accordance with one of said redundancy versions. 4. A method as claimed in any one of the preceding claims, wherein the respective starting positions of the redundancy versions in the set of redundancy versions are fixed. 5. The method of claim 4, wherein the set of redundancy versions comprises four redundancy versions. 6. A method according to any of the preceding claims, wherein said buffer is a circular buffer. 7. A method according to any of the preceding claims, comprising receiving information about the index of the redundancy version and, depending on the information about the index of the version of the redundancy, using the corresponding version of the redundancy. 8. A method according to any of the preceding claims, comprising receiving configuration information to determine criteria that the corresponding redundancy versions satisfy. 9. A method according to any of the preceding claims, wherein the configuration information comprises at least one of code rates for generating initial positions of redundancy versions; and the number of retransmissions to generate the starting positions of the redundancy versions. 10. A method as claimed in any one of the preceding claims, wherein said buffer comprises a first area containing systematic bits to be transmitted and a second area containing parity bits to be transmitted. 11. The method of claim 10, wherein said first, second, and third redundancy versions are located in said first region. 12. The method of claim 10 or 11, wherein said fourth redundancy version is located in a second region. 13. The method of claim 10, wherein said second, third, and fourth redundancy versions are located in said second region. 14. The method of claim 10, wherein said first redundancy version is located in the first region. 15. A method as claimed in any one of the preceding claims, wherein said fixed redundancy positions are selected based on a starting position of at least a second sequential transmission. 16. A method as claimed in any one of the preceding claims, wherein said block coding is a low density parity coding. 17. A device for obtaining information about the redundancy version, containing at least one processor and at least one memory containing a computer program code, and at least one memory and computer program code are configured so that with the help of at least one processor: receive, from the base station, information about the version of the redundancy for the data block; and use, based on the received information about the redundancy version, at least one version of the redundancy from the set of redundancy versions to transmit said data block to the base station, wherein said set of redundancy versions contains redundancy versions RV0, RV1, RV2 and RV3, and the initial positions of said redundancy versions in a buffer used in block coding of said data block satisfy one or more of the following criteria: the distance between the start position of the redundancy version RV2 and the start position of the redundancy version RV3 is greater than the distance between the start position of the redundancy version RV1 and the start position of the redundancy version RV2; the distance between the start position of the redundancy version RV1, the start position of the redundancy version RV2 or the start position of the redundancy version RV3 and the start position of the corresponding previous sequential redundancy version is increased; the starting position of the redundancy version RV1, the redundancy version RV2 and / or the redundancy version RV3 is outside the systematic bit area of said buffer; and the distance between the start position of the redundancy version RV0 and the start position of the redundancy version RV1 is greater than the distance between the start position of the redundancy version RV1 and the start position of the redundancy version RV2 and than the distance between the start position of the redundancy version RV2 and the start position of the redundancy version RV3.

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