WO2019154522A1 - Dispositifs et procédés de transmission d'un paquet de données dans un réseau de communication - Google Patents

Dispositifs et procédés de transmission d'un paquet de données dans un réseau de communication Download PDF

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Publication number
WO2019154522A1
WO2019154522A1 PCT/EP2018/053445 EP2018053445W WO2019154522A1 WO 2019154522 A1 WO2019154522 A1 WO 2019154522A1 EP 2018053445 W EP2018053445 W EP 2018053445W WO 2019154522 A1 WO2019154522 A1 WO 2019154522A1
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WIPO (PCT)
Prior art keywords
transmission
data packet
scheme
multiplexing scheme
transmitter
Prior art date
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PCT/EP2018/053445
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English (en)
Inventor
Karthikeyan Ganesan
Ali Ramadan ALI
Sandip GANGAKHEDKAR
Amine Maaref
Josef Eichinger
Yongxia Lyu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN201880089026.4A priority Critical patent/CN111713055A/zh
Priority to PCT/EP2018/053445 priority patent/WO2019154522A1/fr
Publication of WO2019154522A1 publication Critical patent/WO2019154522A1/fr

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Classifications

    • 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
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • 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
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/189—Transmission or retransmission of more than one copy of a message

Definitions

  • the present invention relates to mobile communication. More specifically, the present invention relates to a transmitter and a receiver as well as corresponding methods for transmitting a data packet in a mobile communication network.
  • Ultra-reliable low latency communication is one of the crucial requirements of 5G new radio (NR) technology for vehicular communication, industrial automation and etc., in which small data transmission requires low latency of 1 s and a very high reliability of 99.999%, as shown in the table of figure 1 .
  • Spectral-inefficient lower modulation and coding rate are essential to meet the challenging uRLLC-reliability requirement, which ultimately requires more bandwidth and thus limits uRLLC connection of user equipments (UE) per cell.
  • Meeting uRLLC requirements in a high cell load is a challenging task due to an increased queuing delay, wherein the total latency comprises the queuing latency, transmission time, processing time at the receiver and an N-1 amount of round-trip times of the HARQ (Hybrid Automatic Repeat Request), wherein N is the total number of transmissions.
  • HARQ Hybrid Automatic Repeat Request
  • the design for the 5G NR should support multiple services at the same time and consider scalable key performance indicators (KPIs) for various vertical industries, as shown in the figure 2.
  • KPIs key performance indicators
  • the preemption-based approach is considered in the situation as shown in figure 3, in which a uRLLC transmission 303 based on mini-slots may occur when resources are already scheduled for an ongoing eMBB data transmission 301 for downlink.
  • a uRLLC transmission 303 based on mini-slots may occur when resources are already scheduled for an ongoing eMBB data transmission 301 for downlink.
  • the preemption method once an uRLLC data packet arrives, part of the resource allocated to eMBB data will be punctured and reassigned to the UE for the uRLLC transmission.
  • a post-indication message about the impacted resource is sent to the eMBB UE(s) to avoid soft-buffer pollution for HARQ and the subsequent transmission from gNB (i.e., next generation node B) schedules the impacted resource immediately without waiting for the feedback.
  • gNB i.e., next generation node B
  • the main focus of the current standardization is how the pre-emption indication could be read by eMBB UEs to avoid soft buffer pollution for HARQ transmission.
  • the main drawback of the preemption scheme is that the reliability of eMBB is affected and the retransmission opportunity which is required to recover the effect of pre-emption affects the overall spectral efficiency. After uRLLC transmission is finished, eMBB transmission can be resumed. In this case the latency of eMBB transmission will increase.
  • a second method is associated with L (L>1 ) repetition-based uRLLC transmission without feedbacks of acknowledgement (ACK) or non-acknowledgements (NACK) to achieve a required target of a block error rate (BLER), wherein the subsequent repetition for the same transport block (TB) can be dynamically changed e.g., transmit power or resource allocation.
  • L L>1
  • ACK acknowledgement
  • NACK non-acknowledgements
  • a third method based on the adaptive HARQ-based transmission with multiple CQI (channel quality indicator) report is configured based on a flexible BLER target.
  • MCS relaxed modulation coding scheme
  • More details about the third method can be found in "MCS/CQI design for URLLC transmission", Huawei, RAN1 -AH-1801 meeting.
  • the reliability required by the uRLLC traffic could be up to 99.999% within certain latency bound that depends on the application.
  • the resources required to deliver uRLLC packets are generally higher than those for eMBB due to usage of a lower code rate.
  • Non-orthogonal transmission schemes could be applied for both intra-UE multiplexing and inter-UE multiplexing of eMBB and uRLLC.
  • Several non-orthogonal schemes are proposed and they mainly incorporate code-based multiplexing, power-based multiplexing on top of orthogonal scheduling methods.
  • Such transmission schemes include, for instance, superposition transmission based on MUST (multi-user superposition technique), sparse code multiple access (SCMA), resource spread multiple access (RSMA), and etc.
  • the user could reuse its eMBB resource for the urgent uRLLC transmission. If the eMBB resource is reused for the uRLLC transmission, some of resources of eMBB and uRLLC would be overlapped in both time domain and frequency domain via the NOMA technique (Non-Orthogonal Multiple Access, a superposition technique), providing required spectral efficiency.
  • NOMA Non-Orthogonal Multiple Access, a superposition technique
  • the reliability of the NOMA depends on the high SNR (signal-to-noise-ratio) channel condition, receiver algorithm complexity and etc.
  • spatial multiplexing could be an option to address the problem of eMBB and uRLLC coexistence by mapping both services in different MIMO layers in case of a rich multipath environment.
  • the eMBB service can be transmitted with the default transmitter scheme, for example, SISO or 2x2MIMO, configured by the base station.
  • SISO or 2x2MIMO configured by the base station.
  • an extra MIMO layer is added to spatially multiplex the uRLLC data with the eMBB data, as shown in the figure 4.
  • Spatial multiplexing is especially suitable for use cases such as indoor industrial automation or vehicle-to vehicle (V2V) communication, where the benefit of spatial multiplexing from rich multipath environment could be achieved.
  • V2V vehicle-to vehicle
  • Widely-separated antennas placed in vehicles enable very low correlation among them, which is the key to minimizing interference at the receiver.
  • the applicable scenarios can be downlink and sidelink communications.
  • Spatial diversity techniques could also be applied together with spatial multiplexing to enhance the overall signal-noise-ratio while reliability performance of uRLLC services could be further enhanced with closed loop MIMO precoding techniques with weighted eigen-vectors for the uRLLC transmission.
  • the non-orthogonal multiplexing and spatial multiplexing transmission schemes provide high spectral efficiency required for the uRLLC and eMBB coexistence, meeting reliability requirements of uRLLC within certain latency bound is still a question.
  • the channel condition for uRLLC/eMBB remains the same and also the limitation of channel capacity for the same UE applies which remains the same for any other NOMA schemes in preliminary.
  • the invention relates to a transmitter and a receiver as well as corresponding methods for transmitting a data packet in a mobile communication network. More specifically, the transmitter and the receiver according to embodiments can use resource- efficient transmission techniques to improve the overall spectral efficiency and to increase the average cell throughput for the coexistence of eMBB and uRLLC data in 5G mobile networks.
  • embodiments of the present disclosure apply both HARQ-less which is blind repetition-based dynamic transmission multiplexing scheme and/or adaptive HARQ-based transmission, according to which effects of uRLLC and eMBB coexistence with different multiplexing schemes and different reliability target are explored.
  • embodiments of the invention can achieve high uRLLC reliability within the HARQ latency bound in a resource-efficient way by avoiding overprovisioning of resources and increasing the system capacity of uRLLC users.
  • the invention relates to a transmitter for transmitting a data packet to a receiver, in particular according to a hybrid automatic repeat request (HARQ) scheme or blind repetition scheme, wherein the transmitter comprises a communication interface for transmitting the data packet as well as a processor that is configured to determine a first transmission multiplexing scheme for transmitting the data packet in a first transmission and determine a second transmission multiplexing scheme for transmitting the data packet in a second transmission, wherein a multiplexing scheme comprises a multiplexing of at least two different services and the first transmission multiplexing scheme is associated with a higher block error rate than the second transmission multiplexing scheme, and wherein the first transmission is timely separated from the second transmission.
  • the at least two different services comprise eMBB and uRLLC transport blocks with different reliability targets.
  • a multiplexing scheme can be a scheme that multiplexes at least two signals orthogonal or non-orthogonal, wherein the non-orthogonal multiplexing comprises spatial multiplexing or NOMA multiplexing (non-orthogonal multiple access multiplexing).
  • Further multiplexing schemes comprise for instance preemption of eMBB based approach or dynamic scheduling.
  • an improved transmitter is provided, allowing transmitting a data packet to a receiver in an efficient and reliable manner.
  • the communication interface is configured to receive a retransmission request after transmitting the data packet in the first transmission, wherein the request for the retransmission of the data packet; the processor is configured to determine the second multiplexing scheme based on the reliability target upon reception of the retransmission request.
  • the second transmission is the retransmission requested by the
  • the processor is configured to determine the second multiplexing scheme after expiry of a predetermined time interval after determining the first transmission multiplexing scheme, and/or the communication interface is configured to retransmit the data packet in the second transmission after expiry of a predetermined time interval after the first transmission.
  • the predetermined time intervals can be parameters from an autonomous HARQ transmission scheme.
  • the data packet comprises a first data packet portion and a second data packet portion, wherein the first data packet portion requires higher reliability and/or lower latency than the second portion of the data packet.
  • the first data packet portion is associated with a data transmission service, in particular a uRLLC service, wherein the data transmission service can also comprise an requested transport block from MAC layer, and the processor is configured to determine the respective transmission multiplexing scheme that meets a block error rate requirement associated with the data transmission service.
  • a suitable transmission method can be selected on the basis of the reliability requirement of the data transmission service, in particular an uRLLC service, meeting the requirement of the uRLLC data transmission.
  • the second data packet portion is associated with a further data transmission service, in particular an eMBB service for data transmission.
  • the first transmission multiplexing scheme is associated with transmission according to a first transmission scheme and the second transmission multiplexing scheme is associated with transmission according to a second transmission scheme.
  • the first transmission scheme and the second transmission scheme comprise at least one of the following schemes: overlapping the first data packet portion with the second data packet portion, in particular a superposition-based transmission method such as a non-orthogonal multiple access (NOMA) and/or a spatial multiplexing, a coding scheme, a modulation, a puncturing, a scheduling, or preemption of resources, wherein the second transmission scheme is different from the first transmission scheme.
  • a superposition-based transmission method such as a non-orthogonal multiple access (NOMA) and/or a spatial multiplexing
  • NOMA non-orthogonal multiple access
  • a spatial multiplexing such as a coding scheme, a modulation, a puncturing, a scheduling, or preemption of resources
  • the first transmission multiplexing scheme provides higher spectral efficiency than the second transmission multiplexing scheme.
  • the processor of the transmitter can first exploit overlapping of uRLLC & eMBB for the initial transmission (e.g. by using NOMA or spatial multiplexing) to save the resources and then can apply a robust transmission method, such as orthogonal frequency-division multiplexing scheme (OFDM), to ensure better reliability during retransmissions.
  • OFDM orthogonal frequency-division multiplexing scheme
  • the processor is further configured to determine the respective transmission multiplexing scheme for
  • the communication interface is further configured to signal the respective transmission multiplexing scheme, in particular in control information, to the receiver, wherein the respective transmission multiplexing scheme comprises information indicating the respective transmission scheme.
  • the communication interface is further configured to transmit the data packet to the receiver using a predetermined transmission multiplexing scheme.
  • the communication interface is further configured to transmit a reconfiguration message to the receiver, wherein the reconfiguration message indicates one or more predetermined set of transmission multiplexing schemes associated with redundancy version and/or a transmission number; and to signal these one or more predetermined set to the receiver in the reconfiguration message, wherein the dynamic activation of a set from the one or more predetermined set is done by the control information.
  • the communication interface of the transmitter is further configured to transmit a reconfiguration message to the receiver, wherein the reconfiguration message indicates a change of transmission of the data packet from using the predetermined transmission multiplexing scheme into using the respective transmission multiplexing scheme; and signal the respective transmission multiplexing scheme, in particular in control information, to the receiver, wherein the respective transmission multiplexing scheme comprises information indicating the respective transmission scheme.
  • the invention relates to a method for transmitting a data packet, in particular according to a hybrid automatic repeat request (HARQ) scheme or blind repetition scheme, to a receiver.
  • the method comprises the following steps:
  • determining a first transmission multiplexing scheme for transmitting the data packet in a first transmission transmitting the data packet using the first transmission multiplexing scheme in the first transmission; determining a second transmission multiplexing scheme for transmitting the data packet in a second transmission, wherein the first transmission multiplexing scheme is associated with a higher block error rate than the second transmission multiplexing scheme; and transmitting the data packet using the second transmission multiplexing scheme in the second transmission, wherein the first transmission and the second transmission are timely separated.
  • the method can be implemented using the transmitter according to the first aspect.
  • an improved method is provided, allowing transmitting a data packet to a receiver in an efficient and reliable manner.
  • the invention relates to a receiver for receiving a data packet from a transmitter, in particular according to a hybrid automatic repeat request (HARQ) scheme or blind repetition scheme.
  • the receiver comprises a communication interface that is configured to receive the data packet in a first transmission according to a first transmission multiplexing scheme and to receive the data packet in a second transmission according to a second transmission multiplexing scheme, wherein the first transmission is timely separated from the second transmission; and a processor that is configured to decode the received data packet according the first transmission multiplexing scheme and to decode the received data packet according the second transmission multiplexing scheme, wherein the first transmission multiplexing scheme is associated with a higher block error rate than the second transmission multiplexing scheme.
  • HARQ hybrid automatic repeat request
  • an improved receiver is provided, allowing receiving a data packet from a transmitter such as a base station in an efficient and reliable manner.
  • the invention relates to a method for receiving a data packet from a transmitter, in particular according to a hybrid automatic repeat request (HARQ) scheme or blind repetition scheme.
  • the method comprises: receiving the data packet in a first transmission according to a first transmission multiplexing scheme; decoding the received data packet according the first transmission multiplexing scheme; receiving the data packet in a second transmission according to a second transmission multiplexing scheme, wherein the first transmission is timely separated from the second transmission; and decoding the received data packet according the second transmission multiplexing scheme, wherein the first transmission multiplexing scheme is associated with a higher block error rate than the second transmission multiplexing scheme.
  • HARQ hybrid automatic repeat request
  • the method can be implemented using the receiver such as a user entity or a terminal according to the third aspect.
  • the receiver such as a user entity or a terminal according to the third aspect.
  • an improved method is provided, allowing receiving a data packet from a transmitter such as a base station in an efficient and reliable manner.
  • the invention relates to a computer program product with a program code for performing the method of the second or fourth aspect, when the program code is executed on a computer.
  • the invention can be implemented in hardware and/or software.
  • Figure 1 shows a table summarizing requirements of latency and reliability for various uRLLC scenarios as defined in the 3GPP TR22.862 specification;
  • Figure 2 shows a schematic diagram illustrating a mixed service support for vertical industries in 5G network
  • Figure 3 shows a schematic diagram of a 5G NR frame structure
  • Figure 4 shows a schematic diagram illustrating spatial multiplexing of uRLLC data and eMBB data
  • Figure 5 shows a schematic diagram illustrating content of control information according to an adaptive HARQ scheme
  • Figure 6 shows a schematic diagram illustrating a cellular communication network according to an embodiment
  • Figure 7 shows a schematic diagram illustrating adaptive transmissions on the basis of flexible reliability requirements according to an embodiment
  • Figure 8 shows a schematic diagram illustrating adaptive transmissions on the basis of flexible reliability requirements according to an embodiment
  • Figure 9 shows a schematic diagram illustrating adaptive transmission methods on the basis of flexible reliability requirements according to an embodiment
  • Figure 10 shows a schematic diagram illustrating adaptive transmissions for the uRLLC and eMBB coexistence according to an embodiment
  • Figure 1 1 shows a schematic diagram of an exemplary frame structure for multiplexing of uRLLC and eMBB transmissions according to an embodiment
  • Figure 12 shows a schematic diagram illustrating adaptive transmissions for the uRLLC and eMBB coexistence according to an embodiment
  • Figure 13 shows a schematic diagram illustrating content of control information according to a flexible adaptive HARQ scheme
  • Figure 14 shows a schematic diagram illustrating an exemplary signaling procedure according to an embodiment
  • Figure 15 shows a schematic diagram of an exemplary frame structure for pre-indication according to an embodiment
  • Figure 16 shows a schematic diagram illustrating a transmitting method according to an embodiment
  • Figure 17 shows a schematic diagram illustrating a receiving method according to an embodiment.
  • corresponding device may include a unit to perform the described method step, even if such unit is not explicitly described or illustrated in the figures.
  • the transmitter such as a base station in the embodiments of the present invention can use an enhanced flexible transmission scheme for intra-UE multiplexing of uRLLC and eMBB data, and can vary the transmission multiplexing of uRLLC in the coexistence region on the basis of individual reliability targets of the uRLLC transmission at each transmission attempt and/or dynamic channel conditions between the transmitter and the receiver such as a user entity or a terminal. More details about the enhanced transmission scheme will be further discussed under reference to figures 7-9 in the following embodiments.
  • Figure 6 shows a schematic diagram illustrating a cellular communication network 600 comprising a transmitter 601 according to an embodiment and a receiver 631 according to an embodiment, wherein the transmitter 601 is used for transmitting a data packet in the cellular communication network 600, in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme, and the receiver 631 for receiving the data packet.
  • the transmitter 601 can be implemented in a base station, in particular a next generation Node B in 5G networks
  • the receiver 631 can be, for instance, a user entity or a mobile phone or a terminal or a vehicle.
  • the data packet can comprise a first portion and a second portion, wherein the first portion of the data packet requires higher reliability and/or lower latency than the second portion of the data packet.
  • the first data packet portion is related to a uRLLC data transmission service and the second data packet portion is related to an eMBB data transmission service.
  • a data transmission service can comprise, for instance, a transport block.
  • the transmitter 601 comprises a communication interface 603 configured to transmit the data packet and a processor 605 configured to determine a transmission multiplexing scheme for transmitting the data packet.
  • the receiver 631 Similar to the transmitter 601 , the receiver 631 also comprises a communication interface 633 configured to receive the data packet and a processor 635 configured to decode the received data packet. Further embodiments of the transmitter 601 and the receiver 631 will be described with reference to figure 7 in the following, wherein several adaptive transmissions on the basis of different reliability targets are shown.
  • the processor 605 is configured to determine a first transmission multiplexing scheme for transmitting the data packet in a first transmission 701
  • the communication interface 603 is configured to receive a retransmission request after transmitting the data packet in the first transmission 701 .
  • the processor 605 Upon reception of the retransmission request, the processor 605 is configured to determine a second multiplexing scheme for transmitting the data packet in a second transmission 702, wherein the first transmission multiplexing scheme is associated with a higher block error rate, i.e. a lower reliability requirement, than the second transmission multiplexing scheme.
  • the processor 605 can also be configured to determine the second multiplexing scheme after expiry of a predetermined time interval after determining the first transmission multiplexing scheme, and/or the communication interface 603 is configured to retransmit the data packet in the second transmission with higher reliability target after expiry of a predetermined time interval after the first transmission 701 .
  • the predetermined time intervals can be parameters from an autonomous HARQ transmission scheme.
  • the processor 605 is configured to determine the respective transmission multiplexing scheme that meets a block error rate requirement associated with the data transmission service. In a further embodiment, the processor 605 can also determine the respective transmission multiplexing scheme for retransmitting the data packet on the basis of a channel condition between the transmitter 601 and the receiver 631.
  • the communication interface 633 of the receiver 631 is configured to receive the data packet and the processor 635 of the receiver 631 is configured to decode the received data packet according to the respective transmission multiplexing scheme.
  • the first transmission multiplexing scheme is associated with transmission according to a first transmission scheme and the second transmission multiplexing scheme is associated with transmission according to a second transmission scheme.
  • the first transmission scheme can provide higher spectral efficiency than the second transmission scheme.
  • the transmitter 601 can thus determine a transmission scheme that can provide high spectral efficiency for the first transmission 701.
  • the transmitter 601 can first exploit overlapping of uRLLC & eMBB for the initial transmission 701 (e.g. NOMA, spatial multiplexing) to save the resources and then use a robust transmission method, such as orthogonal frequency-division multiplexing scheme
  • the first transmission scheme can comprise at least one of the following schemes: overlapping the first data packet portion with the second data packet portion, in particular a superposition-based transmission method such as a non-orthogonal multiple access (NOMA) and/or a spatial multiplexing, and the second transmission scheme is different from the first transmission scheme and can comprise for instance orthogonal scheduling (OFDM) of a service and/or preemption of eMBB resource for uRLLC.
  • NOMA non-orthogonal multiple access
  • OFDM orthogonal scheduling
  • the base station scheduler chooses the right transmission parameter based on feedbacks of the channel state information, including full or partial covariance matrix, eigenvalues, rank indicator, channel quality information and etc.
  • Spatial multiplexing which relies on multiple antennas or multiple-input multiple-output (MIMO) techniques is widely used when there is a rich multipath effect due to reflection.
  • MIMO multiple-input multiple-output
  • non-orthogonal transmission schemes provide poorer performance due to multipath and require a high operating signal-noise-ratio (SNR).
  • the embodiments of the present invention can apply the enhanced adaptive transmission scheme which considers the uRLLC and eMBB coexistence with a flexible reliability target and can choose the best multiplexing technique based on the reliability target for each transmission attempt.
  • the embodiments of the present invention can avoid over-provisioning of resources by using relaxed transmission multiplexing at an initial transmission that could coexist both uRLLC and eMBB service at the same and stricter or stringent transmission multiplexing that provides required reliability for retransmissions of uRLLC to decode within the HARQ latency bound.
  • the enhanced adaptive transmission scheme is also applied for HARQ-less which is a dynamic transmission multiplexing method based on blind repetition, in which flexible reliability target could be introduced.
  • the embodiments of the present invention offer in particular the following advantages: first of all, the best transmission method is selected on the basis of the reliability target, meeting the requirement of the uRLLC data transmission.
  • the soft buffer LLR quality can be increased and the IR gain can be preserved in comparison with varying MCS within the HARQ latency bounds.
  • MCS Modulation and Coding Scheme
  • overlapping eMBB symbols performance is softly degraded; conservative MCS schemes for uRLLC could be adopted; and the MCS for uRLLC is not necessarily needed to be adapted within re-transmission for incremental redundancy (IR) gain.
  • IR incremental redundancy
  • Last but not least, resource efficiency for uRLLC is obtained by adapting the transmission methods.
  • the transmission parameters of a multiplexing scheme (such as spatial multiplexing or NOMA) in the subsequent repetition for the same transmission block can be dynamically adjusted.
  • the transmission parameters of the adaptive HARQ scheme for the same transmission block can be dynamically adjusted to provide sufficient spectral efficiency and required reliability.
  • Figure 8 shows a schematic diagram illustrating adaptive transmissions on the basis of flexible reliability targets according to an embodiment, wherein the processor 605 of the transmitter 601 can determine the respective transmission multiplexing scheme that meets a reliability requirement of each data transmission.
  • the transmitter 601 can take into account the channel condition as well as the reliability requirement and then dynamically select the transmission method as shown in the figure 8.
  • varying superposition technique e.g., NOMA
  • orthogonal scheduling techniques can be used for an initial transmission and retransmissions respectively within the HARQ latency for uRLLC data.
  • varying spatial multiplexing and puncturing technique within the HARQ latency bound for uRLLC data can be used.
  • a combination of methods 1 and 2 can be applied in method 3.
  • Figure 9 shows a schematic diagram illustrating adaptive transmission methods which fulfill various reliability requirements in the case of uRLLC and eMBB coexistence according to an embodiment.
  • an orthogonal scheduling can provide the highest reliability (i.e. lowest block error rate) while a superposition-based
  • the transmission method provides a lowest reliability but highest spectral efficiency.
  • the uRLLC service supports transmissions based on mini-slot (e.g. 2-OFDM symbol) and the eMBB service uses 1 ms sub-frame
  • the overlapping symbols of the eMBB and uRLLC transmissions can be handled with the enhanced adaptive HARO scheme.
  • the scheme can perform both non-slot-based transmission and also slot-based unified scheduling for both uRLLC and eMBB data transmissions.
  • the method for uRLLC transmission based on mini-slot can be adapted within the scheduling period of the eMBB transmissions, as shown in figure 10.
  • the adaptive HARO scheme is applicable for uRLLC symbols and also for the overlapping symbols with the eMBB region.
  • a slot-based unified scheduling scheme combined DCI content for both uRLLC and eMBB data is required for the adaptive HARO transmission.
  • Figure 10 shows a schematic diagram illustrating adaptive transmissions in the case of non-uniform scheduling of eMBB and uRLLC data according to an embodiment, wherein the uRLLC service uses transmission based on 0.125ms-slot while the eMBB
  • transmission is scheduled with 1 ms sub-frame type.
  • the overlapping symbols in the coexistence region can be carefully handled by the transmitter 601 according to the embodiment, wherein the initial transmission with a relaxed reliability requirement for the uRLLC data can be performed according to a superposition-based transmission scheme and the later retransmissions with a high reliability requirement can be handled by a robust transmission method such as orthogonal scheduling.
  • this embodiment can improve scheduling flexibility and spectral efficiency as well as can satisfy the reliability requirement of the uRLLC data and softly degrade the performance of the eMBB transmissions.
  • Figure 1 1 shows a schematic diagram of an exemplary frame structure for multiplexing of uRLLC and eMBB transmissions according to an embodiment, wherein the uRLLC service uses transmission based on 0.1 ms-slot while the eMBB transmission is scheduled with 1 ms sub-frame type.
  • figure 12 shows a schematic diagram illustrating adaptive transmissions in the case of non-uniform scheduling of eMBB and uRLLC data, wherein the uRLLC service uses mini-slot based transmission (e.g. 2, 4 or 7 OFDM symbols) while the eMBB transmission is scheduled with 1 ms sub-frame type.
  • mini-slot based transmission e.g. 2, 4 or 7 OFDM symbols
  • the overlapping symbols in the coexistence region shown in figure 12 can be carefully handled by the transmitter according to different transmission schemes on the basis of different reliability requirements for uRLLC transmissions.
  • the communication interface 603 of the transmitter 601 is further configured to signal the respective transmission multiplexing scheme, in particular in control information, to the receiver 631 , wherein the respective transmission multiplexing scheme comprises information indicating the respective transmission scheme.
  • the processor 635 of the receiver 631 is allowed to decode both eMBB and uRLLC transmission accordingly.
  • information about the changes of the respective transmission scheme for each retransmission can be provided to the receiver 631 in the control information, in which the information element in the L1 uRLLC DCI signaling indicating the transmission method can be used together with the corresponding redundancy version (RV).
  • Information field needs to be added in HARQ L1 DCI signaling explicitly indicating the desired de-multiplexing scheme for the uRLLC and eMBB data that can be applied at the receiving side.
  • the communication interface 603 of the transmitter 601 is further configured to transmit the data packet to the receiver 631 using a predetermined transmission multiplexing scheme. Later on, the communication interface 603 can transmit a radio resource control (RRC) reconfiguration request to the receiver 631 , wherein the RRC reconfiguration request indicates a change of transmission of the data packet from using the predetermined transmission multiplexing scheme into using the respective transmission multiplexing scheme.
  • RRC radio resource control
  • the communication interface 603 of the transmitter 601 (i.e. gNB) is configured to transmit a radio resource control (RRC) reconfiguration request to the receiver 631 , wherein the RRC reconfiguration request indicates a change of transmission of the data packet from using the predetermined transmission multiplexing scheme into using the respective transmission multiplexing scheme (step 1401 ).
  • the communication interface 603 of the transmitter 601 can signal the respective transmission multiplexing scheme, in particular in control information, to the receiver 631 , wherein the respective transmission multiplexing scheme comprises information indicating the respective transmission scheme (step 1403).
  • the receiving side (i.e. the user entity) 631 with the knowledge of the redundancy versions (RVs) can know the transmission scheme used by the transmitter 601 for transmitting data and can correspondingly choose the de-multiplexing method.
  • pre-indication In the case of a flexible adaptive HARQ scheme via pre-indication, information field needs to be added in pre-indication message providing the desired transmission method applicable for uRLLC data that need to be applied at the receiver side.
  • pre-indication could be part of CORESET design with group common-PDCCH where the periodicity is semi-statically configured by the radio resource control (RRC) as shown in figure 15. More details can be found in "Summary of remaining issues on pre emption indication", Huawei Tdoc.
  • a grant-free uRLLC transmission could be configured by overlapping time or frequency resources for the on-going eMBB transmission with the NOMA scheme, and then the grant-based uRLLC is used for retransmission with different multiplexing transmission methods.
  • Figure 16 shows a schematic diagram illustrating a method 1600 for transmitting a data packet, in particular according to a hybrid automatic repeat request (HARQ) scheme or blind repetition scheme, to a receiver 631 according to an embodiment.
  • HARQ hybrid automatic repeat request
  • the transmission method 1600 comprises the following steps: determining 1601 a first transmission multiplexing scheme for transmitting the data packet in a first transmission 701 ; transmitting 1603 the data packet using the first transmission multiplexing scheme in the first transmission 701 ; determining 1605 a second transmission multiplexing scheme for transmitting the data packet in a second transmission 702, wherein the first transmission multiplexing scheme is associated with a higher block error rate than the second transmission multiplexing scheme; and transmitting 1607 the data packet using the second transmission multiplexing scheme in the second transmission 702, wherein the first transmission 701 and the second transmission 702 are timely separated.
  • Figure 17 shows a schematic diagram illustrating a method 1700 for receiving a data packet from a transmitter 601 , in particular according to a hybrid automatic repeat request (HARQ) scheme or blind repetition scheme according to an embodiment.
  • HARQ hybrid automatic repeat request
  • the receiving method 1700 comprises the following steps: receiving 1701 receiving the data packet in a first transmission 701 according to a first transmission multiplexing scheme; decoding 1703 the received data packet according the first transmission multiplexing scheme; receiving 1705 the data packet in a second transmission 702 according to a second transmission multiplexing scheme, wherein the first transmission 701 is timely separated from the second transmission 702; and decoding 1707 the received data packet according the second transmission multiplexing scheme, wherein the first transmission multiplexing scheme is associated with a higher block error rate than the second transmission multiplexing scheme.

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

Abstract

L'invention concerne un émetteur (601) permettant de transmettre un paquet de données, en particulier selon un schéma de demande de répétition automatique hybride (HARQ) ou un schéma de répétition aveugle, à un récepteur (631). L'émetteur (601) comprend une interface de communication (603) permettant de transmettre le paquet de données et un processeur (605) qui est configuré pour déterminer un premier schéma de multiplexage de transmission pour transmettre le paquet de données dans une première transmission, et déterminer un deuxième schéma de multiplexage de transmission pour transmettre le paquet de données dans une deuxième transmission, le premier schéma de multiplexage de transmission étant associé à un taux d'erreur de bloc supérieur à celui du deuxième schéma de multiplexage de transmission et la première transmission étant séparée temporellement de la deuxième transmission.
PCT/EP2018/053445 2018-02-12 2018-02-12 Dispositifs et procédés de transmission d'un paquet de données dans un réseau de communication WO2019154522A1 (fr)

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PCT/EP2018/053445 WO2019154522A1 (fr) 2018-02-12 2018-02-12 Dispositifs et procédés de transmission d'un paquet de données dans un réseau de communication

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