WO2019071393A1 - Mappage de symboles par ordre naturel/inverse pour versions redondantes - Google Patents

Mappage de symboles par ordre naturel/inverse pour versions redondantes Download PDF

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Publication number
WO2019071393A1
WO2019071393A1 PCT/CN2017/105396 CN2017105396W WO2019071393A1 WO 2019071393 A1 WO2019071393 A1 WO 2019071393A1 CN 2017105396 W CN2017105396 W CN 2017105396W WO 2019071393 A1 WO2019071393 A1 WO 2019071393A1
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WIPO (PCT)
Prior art keywords
order
mapping
mapping order
natural
modulation
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PCT/CN2017/105396
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English (en)
Inventor
Keeth Saliya JAYASINGHE
Yi Zhang
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Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
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Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2017/105396 priority Critical patent/WO2019071393A1/fr
Priority to CN201780095732.5A priority patent/CN111201820B/zh
Publication of WO2019071393A1 publication Critical patent/WO2019071393A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers
    • H04L27/2042—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers with more than two phase states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes

Definitions

  • the exemplary and non-limiting embodiments relate to Low Density Parity Checking (LDPC) coding chains, more specifically, to modulation mapping order for retransmissions.
  • LDPC Low Density Parity Checking
  • the reliability of each bit is different according to its position in the bit labeling.
  • Gray labeling is used for M-ary QAM, there is log 2 M/2 levels of reliability for mapping bits. That means 256/64/16-QAM have 4/3/2 levels of reliability for each I and Q component.
  • For HARQ one simple scheme is using natural mapping order for initial transmission and retransmission, where bits are mapped from MSB to LSB naturally for each I/Q component, respectively. If different mapping order is used for initial transmission and retransmission, diversity gain can be achieved for multiple transmission. For example, the reverse order is used for retransmission, where the MSBs/LSBs in initial transmission are mapped to LSBs/MSBs in retransmission for each I/Q component, respectively.
  • gNB 5G Enhanced Node B Base station
  • a method in an example of an embodiment, includes identifying, by a network device, a principle for obtaining a mapping order by at least one of redundancy version (RV) and modulation and coding scheme (MCS) .
  • the method includes linking a new data indicator (NDI) with mapping order, and determining an MCS table with additional states for retransmission to indicate mapping order for high order modulation.
  • the method also includes determining to switch based on code rate between a first natural mapping order and multiple mapping orders, and transmitting data based on determined the principle for obtaining the mapping order, the MCS table with the additional states and the switch based on a code rate.
  • An example of an apparatus includes at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to identify a principle for obtaining a mapping order by at least one of redundancy version (RV) and modulation and coding scheme (MCS) , link a new data indicator (NDI) with mapping order, determine an MCS table with additional states for retransmission to indicate mapping order for high order modulation, determine to switch based on code rate between a first natural mapping order and multiple mapping orders, and transmit data based on determined the principle for obtaining the mapping order, the MCS table with the additional states and the switch based on a code rate.
  • RV redundancy version
  • MCS modulation and coding scheme
  • NDI new data indicator
  • An example of an apparatus includes at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to cause performance of a method according to the above example embodiment of a method.
  • Fig. 1 is a block diagram of one possible and non-limiting example system in which the example embodiments may be practiced;
  • Fig. 2 shows an example illustration of a coding gain table
  • Fig. 3 shows an example illustration of a mapping order table
  • Fig. 4a shows an example illustration of a modulation and TBS index table for PDSCH
  • Fig. 4b shows an example illustration of a modulation and TBS index table for PDSCH
  • Fig. 5 shows a method in accordance with example embodiments which may be performed by an apparatus.
  • a method and apparatus may provide different solutions to solve ambiguity issues when determining a mapping order and may optimize the design for mapping order in case of HARQ combination.
  • a user equipment (UE) 110 is in wireless communication with a wireless network 100.
  • a UE is a wireless, typically mobile device that can access a wireless network.
  • the UE 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130 interconnected through one or more buses 127.
  • Each of the one or more transceivers 130 includes a receiver, Rx, 132 and a transmitter, Tx, 133.
  • the one or more buses 127 maybe address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like.
  • the one or more transceivers 130 are connected to one or more antennas 128.
  • the one or more memories 125 include computer program code 123.
  • the UE 110 includes a signaling module 140, comprising one of or both parts 140-1 and/or 140-2, which may be implemented in a number of ways.
  • the signaling module 140 may be implemented in hardware as signaling module 140-1, such as being implemented as part of the one or more processors 120.
  • the signaling module 140-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the signaling module 140 may be implemented as signaling module 140-2, which is implemented as computer program code 123 and is executed by the one or more processors 120.
  • the one or more memories 125 and the computer program code 123 may be configured to, with the one or more processors 120, cause the user equipment 110 to perform one or more of the operations as described herein.
  • the UE 110 comrnunicates with eNB 170 via a wireless link 111.
  • the gNB (NR/5G Node B but possibly an evolved NodeB) 170 is a base station (e.g., for LTE, long term evolution) that provides access by wireless devices such as the UE 110 to the wireless network 100.
  • the gNB 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N/W I/F (s)) 161, and one or more transceivers 160 interconnected through one or more buses 157.
  • Each of the one or more transceivers 160 includes a receiver, Rx, 162 and a transmitter, Tx,163.
  • the one or more transceivers 160 are connected to one or more antennas 158.
  • the one or more memories 155 include computer program code 153.
  • the gNB 170 includes a report module 150, comprising one of or both parts 150-1 and/or 150-2, which may be implemented in a number of ways.
  • the report module 150 may be implemented in hardware as report module 150-1, such as being implemented as part of the one or more processors 152.
  • the report module 150-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the report module 150 may be implemented as report module 150-2, which is implemented as computer program code 153 and is executed by the one or more processors 152.
  • the one or more memories 155 and the computer program code 153 are configured to, with the one or more processors 152, cause the gNB 170 to perform one or more of the operations as described herein.
  • the one or more network interfaces 161 communicate over a network such as via the links 176 and 131.
  • Two or more gNBs 170 communicate using, e.g., link 176.
  • the link 176 may be wired or wireless or both and may implement, e.g., an X2 interface.
  • the one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like.
  • the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195, with the other elements of the gNB 170 being physically in a different location from the RRH, and the one or more buses 157 could be implemented in part as fiber optic cable to connect the other elements of the gNB 170 to the RRH 195.
  • RRH remote radio head
  • the wireless network 100 may include a network control element (NCE) 190 that may include MME (Mobility Management Entity) /SGW (Serving Gateway) functionality, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the Internet) .
  • the gNB 170 is coupled via a link 131 to the NCE 190.
  • the link 131 maybe implemented as, e.g., an S1 interface.
  • the NCE 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N/W I/F (s) ) 180, interconnected through one or more buses 185.
  • the one or more memories 171 include computer program code 173.
  • the one or more memories 171 and the computer program code 173 are configured to, with the one or more processors 175, cause the NCE 190 to perform one or more operations.
  • the wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network.
  • Network virtualization involves platform virtualization, often combined with resource virtualization.
  • Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors 152 or 175 and memories 155 and 171, and also such virtualized entities create technical effects.
  • the computer readable memories 125, 155, and 171 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the computer readable memories 125, 155, and 171 may be means for performing storage functions.
  • the processors 120, 152, and 175 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • the processors 120, 152, and 175 may be means for performing functions, such as controlling the UE 110, gNB 170, and other functions as described herein.
  • the various embodiments of the user equipment 110 can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Intemet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Intemet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • Embodiments herein may be implemented in software (executed by one or more processors) , hardware (e.g., an application specific integrated circuit) , or a combination of software and hardware.
  • the software e.g., application logic, an instruction set
  • a “computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in Fig. 1.
  • a computer-readable medium may comprise a computer-readable storage medium or other device that may be any media or means that can contain or store the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • LTE networks The current architecture in LTE networks is fully distributed in the radio and fully centralized in the core network.
  • the low latency requires bringing the content close to the radio which leads to local break out and multi-access edge computing (MEC) .
  • 5G may use edge cloud and local cloud architecture.
  • Edge computing covers a wide range of technologies such as wireless sensor networks, mobile data acquisition, mobile signature analysis, cooperative distributed peer-to-peer ad hoc networking and processing also classifiable as local cloud/fog computing and grid/mesh computing, dew computing, mobile edge computing, cloudlet, distributed data storage and retrieval, autonomic self-healing networks, remote cloud services and augmented reality.
  • edge cloud may mean node operations to be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head or base station comprising radio parts. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labor between core network operations and base station operations may differ from that of the LTE or even be non-existent. Some other technology advancements probably to be used are Software-Defined Networking (SDN) , Big Data, and all-IP, which may change the way networks are being constructed and managed.
  • SDN Software-Defined Networking
  • Big Data Big Data
  • all-IP all-IP
  • Fig. 2 is an example illustration of a coding gain table 200.
  • TDL-C refers to tapped delay line type C. There are many other types and TDL-C is shown by way of an example illustration.
  • the 3GPP RAN1 NR AH#3 meeting concluded with pending decisions on whether mapping order of bits to modulation symbols is reversed in retransmissions, subject to defining how to avoid ambiguity, for example, by using the natural order for the first transmission of RV0, and the reverse order for retransmissions of RV0 (as indicated by NDI. Suggested scenarios when this (reversing mapping order of bits in retransmission) may be beneficial were considered, such as 1) when chase combining with RV0 is used, 2) with high order modulation (HOM) and repetition, 3) with HOM and low code rate, or 4) In fading channels. RV0 refers to redundancy version 0.
  • a circular buffer may contain different starting points in addition to a first transmission position. These extra positions are known as RV positions and used to provide extra information (parity or systematic bits) such that receiver can soft combine (or start fresh) and decode the transmitted packet.
  • the interleaver with systematic bit priority ordering was adopted for RV0.
  • Systematic bit priority ordering requires that systematic bits are mapped first into the row-column interleaver, where the number of rows equal to the modulation order. Then, row-wise left-to-right writing and column wise top-down reading is performed before the modulation mapper. This process may also be done such that the number of columns in the rectangular interleaver is equal to the modulation order. After the bit-level interleaver, the bits may be mapped to the modulation symbols and used in the transmission.
  • each modulation (mod) 210 shown in the first column as, for example, 16 QAM, 64 QAM, and 256 QAM
  • a particular code rate (CR) 220 value shown in the header row as, for example, 0.33, 0.40, 0.50, 0.67, etc.
  • coding gains for example mod 210 of 16 QAM for a CR 220 of 0.33 may have a coding gain of 0.79.
  • different modulation mapping order may be used for initial transmission and retransmission to achieve better soft combining gain.
  • a case with chase combination is provided in Table. 200.
  • the gain is determined considering the reverse order for each retransmission (for example, First transmission (or initial transmission) and third transmission (or second retransmission) in the natural order and others are in the reverse order) compared to all transmissions in the natural order.
  • RV redundancy versions
  • mapping order may occur. Even though there are performance benefits by using the retransmissions with the reverse order, there may be ambiguity when determining the mapping order in the case of previous control messages that have been missed at the receiver side. For example, in scenarios in which natural order and reverse order is used for subsequent transmissions, UE 110 may have problematic scenarios when UE 110 missed the previous PDCCH messages. Additional dynamic signaling, for example, 1 additional bit for each code word, for indicating mapping order may increase the control overhead.
  • the example embodiments described herein provide an optimized solution that addresses the issues of ambiguity in a manner that does not incur an increase in control overhead.
  • Example embodiments may provide mapping order design for HARQ combination.
  • IR HARQ may have better performance than CC HARQ, and reverse mapping in IR HARQ may require particular attention as reverse mapping in IR HARQ carries a different number of parity bits in the retransmission.
  • RV0 and RV3 may be designed with consideration of self-decoding and almost all systematic bits may be transmitted independently in these two RVs. Therefore, different mapping order may be preferred (for example, selected by the device based on provided instructions) without requiring particular focus on RV order for the retransmissions.
  • mapping order there may be no performance gain for QPSK with HARQ combination with different mapping order.
  • the example embodiments described herein provide different solutions to solve issues of ambiguity when determining mapping order and to optimize the design of mapping order in case of HARQ combination.
  • mapping order table 300 an example illustration of a mapping order table 300 is shown.
  • table 300 is a table for mapping order with RV/MCS.
  • MCS 310 shown in the first column as, for example, Xl, X2, X3, X4, etc., there may be corresponding RVs (shown as columns RV0 315, RV1 320, RV3 325, and RV3 330.
  • the mapping order are shown as either natural or reverse in rows corresponding to the MCS for each RV.
  • the example embodiments provide new schemes to determine the mapping order for multiple transmission in both CC and IR HARQ and to solve ambiguity issues, which includes features such as: 1) an implicit principle for obtaining mapping order, 2) linking new data indicator (NDI) with mapping order, 3) adding states in MCS table for retransmission, and 4) determining when to switch between mapping orders.
  • NDI new data indicator
  • NDI link new data indicator
  • mapping order for example, when NDI is toggled, the natural mapping order may be used; Otherwise, reverse order may be used. This may achieve gain for RV0 315 with natural order and RV0 315 or RV3 330 with reverse order.
  • new transport block size TBS
  • NDI is not toggled for retransmissions.
  • mapping order for high order modulation (16 QAM, 64QAM, 256QAM)
  • two additional two HARQ states may be used for 16 QAM, 64QAM with reverse mapping order and two existed HARQ state may be reused for 16 QAM, 64QAM with natural order.
  • mapping order (According to code rate and modulation order, for example, MCS) switching between one natural mapping order and multiple mapping order that at least includes a natural order and reverse order.
  • a code rate is larger than one threshold or modulation mode is QPSK, just (for example, without other mapping orders) natural mapping order may be used.
  • a code rate is smaller than one threshold and modulation mode is 16/64/256QAM, multiple mapping orders may be used at least including natural order and reverse order.
  • the threshold may be a predetermined threshold, which may be provided by an operator or governing body (for example, the fixed rate may be 1/2 and may be provided in a specification) .
  • Different schemes such as schemes with feature 1, 2, 3 described above (for example, implicit principle for obtaining mapping order, linking new data indicator (NDI) with mapping order, adding states in MCS table for retransmission) may be used to determine the mapping order.
  • an implementation of an implicit principle for example a first scheme for determining the mapping order and resolving ambiguity for obtaining the mapping order by RV and/or MCS is illustrated.
  • UE 110 or receiver
  • the system may specify one table with the linkage between mapping order and RV/MCS. Both gNB 170 and UE 110 may follow this table to determine the mapping order to generate modulation symbols.
  • MCS is a combination of modulation order and coding rate.
  • the performance with different mapping order for each RV may be different for each specific MCS. Therefore, the mapping order for each RV with optimum performance may be stored in this designed table.
  • adaptive transmission is used for retransmissions where the RV is selected by the transmitter.
  • the system (for example, UE 110 and 170 in DL and UL directions) may analyse different combinations and may determine a (for example, good) estimate for mapping order for each RV and MCS. This process may eliminate ambiguity and also allow the transmitter to select the RV and mapping order from a (for example, simple) look-up table.
  • Table 300 illustrates a table suitable for IR and CC HARQ. For CC HARQ, the last few entries in MCS may denote only the modulation order which may be assigned with reverse order. The embodiments add information about reverse and natural order to an MCS table.
  • the enhanced table 300 may thereby include extra information such that gNB 170 and UE 110 may be able to determine what MCS is being used with different RVs.
  • the example embodiments may link NDI with mapping order (for example, a second scheme for determining the mapping order and resolving ambiguity) .
  • NDI and RV may be combined to avoid the receiver ambiguity on the exact mapping order.
  • NDI When new data is transmitted, NDI may be toggled.
  • RV0 When new data is transmitted, RV0 may be used for the first transmission.
  • an example embodiment may use natural order when NDI is toggled and otherwise use the reverse order. Based on this principle, the natural order may be used for initial transmission of RV0 and reverse order may be used for all the retransmission.
  • the system may thereby achieve gain from the combination ofRV0 315 with the natural order and RV0 315 with the reverse order or from the combination of RV0 315 with the natural order and RV3 330 with the reverse order.
  • the example embodiments may include two/three retransmission to provide optimization.
  • An optimal condition for the system is that reverse ordering or natural ordering is used for each and every retransmissions and UE 110 always knows that what is has to do (when earlier transmission are missed or received or any other cases) .
  • the scheme may in some instances be suboptimal, the system may achieve performance gain (including by using reverse order mapping in some instances) without any additional signalling overhead.
  • RV0 may be transmitted with natural order. NDI is not toggled for next transmissions. But all next transmissions will be reverse order. UE 110 may not have any ambiguity even they lose first transmission as they always know that all other transmissions are reversed.
  • RV0 is transmitted with natural order. NDI is not toggled for next transmissions. RV0 with reverse mapping or RV3 with reverse mapping is used always for next transmissions. The UE 110 may know that if they decode incorrectly or missed the previous one and NDI is not changed, the UE 110 is to assume that the transmission was made with reverse order.
  • Figs. 4A and 4B show example illustrations of modulation and TBS index tables 400 and 450 for PDSCH.
  • tables 400 and 450 each include an MCS index 405 (I MCS ) , a modulation order 410 (Q M ) , and a TBS index 415 (I TBS ) .
  • Figs. 4A and 4B illustrate additional states in MCS table for indicating mapping order (for example, a third scheme for the mapping order and resolving ambiguity) .
  • multiple states for example, three/four states
  • Performance gain by a combination of retransmission with different mapping order may be achieved only in cases of high order modulation (for example, 16 QAM, 64 QAM, etc. ) . Therefore, the system may use natural mapping order (for example, just natural mapping order is needed) for modulation orders above 2.
  • the existing MCS state for example, 30/31 (as shown, for example, in Fig. 4A) may be reused to indicate modulation order 4/6 with the natural order.
  • the MCS state is defined as an index such that it can be translated to bit map (for example, 10101. Five bit) . Transmitter may only send these bits then receiver derives all implicit details based on that. The implicit details may include the modulation order.
  • Table 4B Two additional states may be introduced to indicate modulation order 4/6 with reverse mapping order.
  • Table 4B illustrates an example for 16 QAM/64 QAM, the same principle may be extended to 256 QAM or even higher order modulation.
  • table 4B illustrates an example for two mapping order, for example, natural order and reverse order
  • the table 4A may be extended to the case with more mapping orders, for example, bit shifting for natural order and reverse of this shifted natural order. In instances in which the same 5 bit field is required, some MCS indexes may be removed/replaced.
  • Example embodiments may switch between one or multiple natural mapping orders according to code rate or modulation order or MCS.
  • code rate or modulation order or MCS At low code rate, the performance difference between IR and CC may become smaller since the space for achieving more parity bits is limited.
  • the system may switch mapping order according to the actual coding rate and modulation mode, fbr example, MCS.
  • mapping orders at least including natural order and reverse order may be used to achieve better performance gain.
  • schemes for example, implicit principle for obtaining the mapping order, linking NDI with mapping order, and additional states
  • the system may use just the natural mapping order (for example, in this instance the natural mapping order may be enough/sufficient) .
  • UE 110/gNB 170 behaviour may determine the mapping order for the modulation bits. Implicit principle or signalling may be used to notify the used mapping order. For example, in instances ofDL, if the natural mapping is used, the bit level interleaver used at the gNB 170 and UE 110 will use the following: 1) It is a rectangular interleaver and number of rows is equal to modulation order. 2) Writing is done row wise. 3) Reading is done column wise. 4) Columns may be directly mapped to the modulation symbols in natural order. bl b2 b3 b4 (assuming modulation order is 4) mapped to the modulation symbol. Step 4 will be changed to b4 b3 b2 bl in the mapping. Please note that bl b2 b3 b4 represents the bits when reading a particular column.
  • log likelihood ratios (LLRs) received for particular transmissions may be combined with the previous transmission without any errors.
  • Fig. 5 is an example flow diagram 500 illustrating a process of implementing natural/reverse order symbol mapping for redundancy versions.
  • UE 110/gNB 170 may obtain mapping order by RV and/or MCS based on a predetermined principle provided by the system (for example, instructions provided by a network device (s) in network 100) .
  • the UE 110/gNB 170 may follow the same specification (for example, receive instructions based on a same specification) and interleaver and mapping may be the same.
  • UE 110/gNB 170 may receive instructions for obtaining mapping order by RV and/or MCS.
  • the instructions for obtaining mapping order may include specified table between mapping order and RV and/or MCS.
  • the instructions for obtaining mapping order may include a fixed mapping relation between mapping order and RV version.
  • UE 110/gNB 170 may (for example, receive instructions to) link NDI with mapping order. For example, when NDI is toggled, the natural mapping order may be used (for multiple transmission in both CC and IR HARQ and to solve the ambiguity issues) . Otherwise, reverse order may be used.
  • UE l l0/gNB 170 may add states in MCS table for retransmission to indicate mapping order for high order modulation. For example, two additional two HARQ states may be used for 16 QAM, 64QAM with reverse mapping order and two existed HARQ state may be reused for 16 QAM, 64QAM with natural order.
  • UE 110/gNB 170 may switch between one natural mapping order and multiple mapping orders at least including natural order and reverse order based on a code rate and modulation order. Natural order is always from the top to bottom (in terms of the rectangular interleaver) or b 1 b2 b3 b4 b5 b6 (in terms of a bit sequence) .
  • UE 110/gNB 170 may transmit and retransmit (in both CC and IR HARQ based on the selected scheme.
  • mapping order designs and determination schemes achieve performance gain for multiple transmission with different mapping order for modulation bits in both IR and CC HARQ.
  • the schemes resolve ambiguity issues when determining the mapping order and to optimize the design for mapping order in case of HARQ combination.
  • the schemes may provide a predetermined trade-off between performance gain and signalling overhead. In case of extra bits introduced to indicate the reverse or natural order, this may cause performance loss for the control channels due to the increase of payload size. hnplicit ways described by the embodiment do not have that increase of payload size and corresponding performance loss. However, there are slight chances that third or fourth transmissions do not get the same soft combining gains. This may happen less than 1 % of overall cases compared to control overhead that happens 100 % of the time.
  • An example embodiment may provide a method comprising identifying, by a network device, a principle for obtaining a mapping order by at least one of redundancy version (RV) and modulation and coding scheme (MCS) .
  • the method includes linking a new data indicator (NDI) with mapping order, and determining an MCS table with additional states for retransmission to indicate mapping order for high order modulation.
  • the method also includes determining to switch based on code rate between a first natural mapping order and multiple mapping orders, and transmitting data based on determined the principle for obtaining the mapping order, the MCS table with the additional states and the switch based on a code rate.
  • the method may comprise identifying a specified table between mapping order and RV and/or MCS.
  • the method may comprise identifying a fixed mapping relation between mapping order and RV version.
  • the method may comprise natural order is used for RV0, and RV2; and reverse order is used for RV3, and RV1.
  • the method may comprise using a natural mapping order when the NDI is toggled; and using a reverse order when NDI is not toggled.
  • the method may comprise for incremental redundancy (IR) Hybrid Automatic Repeat Request (HARQ) , identifying new transport block size (TBS) when transmission is with RV0 and NDI is toggled.
  • IR incremental redundancy
  • HARQ Hybrid Automatic Repeat Request
  • TBS transport block size
  • the method may comprise wherein for Chase Combination (CC) Hybrid Automatic Repeat Request (HARQ) , NDI is not toggled for retransmissions.
  • CC Chase Combination
  • HARQ Hybrid Automatic Repeat Request
  • the method may comprise using two additional HARQ states for 16 QAM, 64QAM with reverse mapping order and reusing two existing HARQ states for 16 QAM, 64QAM with natural order.
  • the method may comprise using only the at least one natural mapping order when the code rate is larger than at least one predetermined threshold or modulation mode is Quadrature Phase Shift Keying (QPSK) .
  • QPSK Quadrature Phase Shift Keying
  • the method may comprise using the multiple mapping orders at least including a natural order and a reverse order when the code rate is smaller than at least one predetermined threshold and modulation mode is one of 16 QAM, 64QAM and 256QAM.
  • An example embodiment may be provided in an apparatus comprising at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to: identify a principle for obtaining a mapping order by at least one of redundancy version (RV) and modulation and coding scheme (MCS) ; link a new data indicator (NDI) with mapping order; determine an MCS table with additional states for retransmission to indicate mapping order for high order modulation; determine to switch based on code rate between a first natural mapping order and multiple mapping orders; and transmit data based on determined the principle for obtaining the mapping order, the MCS table with the additional states and the switch based on a code rate.
  • RV redundancy version
  • MCS modulation and coding scheme
  • NDI new data indicator
  • the apparatus may identify a specified table between mapping order and RV and/or MCS.
  • the apparatus may identify a fixed mapping relation between mapping order and RV version.
  • the apparatus may use natural order for RV0, and RV2; and reverse order is used for RV3, and RV1.
  • the apparatus may use a natural mapping order when the NDI is toggled; and use a reverse order when NDI is not toggled.
  • the apparatus may for incremental redundancy (IR) Hybrid Automatic Repeat Request (HARQ) , identify new transport block size (TBS) when transmission is with RV0 and NDI is toggled.
  • IR incremental redundancy
  • HARQ Hybrid Automatic Repeat Request
  • TBS transport block size
  • the apparatus may for Chase Combination (CC) Hybrid Automatic Repeat Request (HARQ) , NDI is not toggled for retransmissions.
  • CC Chase Combination
  • HARQ Hybrid Automatic Repeat Request
  • the apparatus may use two additional HARQ states for 16 QAM, 64QAM with reverse mapping order and reusing two existing HARQ states for 16 QAM, 64QAM with natural order.
  • the apparatus may use only the at least one natural mapping order when the code rate is larger than at least one predetermined threshold or modulation mode is Quadrature Phase Shift Keying (QPSK) .
  • QPSK Quadrature Phase Shift Keying
  • An example embodiment may provide a non-transitory computer readable medium encoded with instructions that, when executed by a computer, cause performance of a method according to any of the preceding methods.
  • Embodiments herein may be implemented in software (executed by one or more processors) , hardware (e.g., an application specific integrated circuit) , or a combination of software and hardware.
  • the software e.g., application logic, an instruction set
  • a “computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in Fig. 1.
  • a computer-readable medium may comprise a computer-readable storage medium (e.g., memories 125, 155, 171 or other device) that may be any media or means that can contain, store, and/or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • a computer-readable storage medium does not comprise propagating signals.
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • Embodiments may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process.
  • Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and fonned on a semiconductor substrate.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are “connected” or “coupled” together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non-exhaustive examples.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des procédés pour déterminer l'ordre de mappage pour une transmission multiple dans une demande de répétition automatique hybride (HARQ) comprenant l'identification, par un dispositif de réseau, d'un principe pour obtenir un ordre de mappage par au moins une version de redondance (RV) et un schéma de modulation et de codage (MCS) et transmettre des données sur la base du principe identifié. Les procédés comprennent également la liaison d'un nouvel indicateur de données (NDI) avec un ordre de mappage, et la détermination d'une table de MCS avec des états supplémentaires pour la retransmission pour indiquer un ordre de mappage pour une modulation d'ordre élevé. Les procédés comprennent également la détermination d'une commutation sur la base d'un débit de code entre un premier ordre de mappage naturel et de multiples ordres de mappage, et la transmission de données sur la base du principe déterminé pour obtenir l'ordre de mappage, de la table de MCS avec les états supplémentaires et de la commutation sur la base d'un débit de code.
PCT/CN2017/105396 2017-10-09 2017-10-09 Mappage de symboles par ordre naturel/inverse pour versions redondantes WO2019071393A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112398574A (zh) * 2019-08-16 2021-02-23 大唐移动通信设备有限公司 一种传输调度的方法和设备
CN113767581A (zh) * 2019-05-02 2021-12-07 上海诺基亚贝尔股份有限公司 控制无线通信中的数据发送

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090276675A1 (en) * 2008-05-05 2009-11-05 Jussi Ojala Signaling of redundancy version and new data indication
US20140126661A1 (en) * 2008-04-03 2014-05-08 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for conveying precoding information in a mimo system
US20170141903A1 (en) * 2014-04-30 2017-05-18 Zte Corporation Feedback Information Processing Method, Device and System

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090043414A (ko) * 2007-10-29 2009-05-06 엘지전자 주식회사 Ｈａｒｑ를 이용한 데이터 전송방법
WO2011102697A2 (fr) * 2010-02-22 2011-08-25 엘지전자 주식회사 Procédé et appareil pour réaliser un processus de demande automatique de retransmission hybride pour une émission à mots de code multiples en voie montante dans un système de communication sans fil prenant en charge une émission par antennes multiples
WO2014010995A1 (fr) * 2012-07-12 2014-01-16 엘지전자 주식회사 Procédé pour émettre un signal de commande pour une communication de dispositif à dispositif et dispositif associé
ES2947614T3 (es) * 2013-01-11 2023-08-14 Interdigital Patent Holdings Inc Sistema y método de modulación adaptativa

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140126661A1 (en) * 2008-04-03 2014-05-08 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for conveying precoding information in a mimo system
US20090276675A1 (en) * 2008-05-05 2009-11-05 Jussi Ojala Signaling of redundancy version and new data indication
US20170141903A1 (en) * 2014-04-30 2017-05-18 Zte Corporation Feedback Information Processing Method, Device and System

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113767581A (zh) * 2019-05-02 2021-12-07 上海诺基亚贝尔股份有限公司 控制无线通信中的数据发送
CN113767581B (zh) * 2019-05-02 2023-09-26 上海诺基亚贝尔股份有限公司 控制无线通信中的数据发送
CN112398574A (zh) * 2019-08-16 2021-02-23 大唐移动通信设备有限公司 一种传输调度的方法和设备
CN112398574B (zh) * 2019-08-16 2022-04-29 大唐移动通信设备有限公司 一种传输调度的方法和设备

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