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WO2019029592A1 - Agrégation de créneaux - Google Patents

Agrégation de créneaux Download PDF

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Publication number
WO2019029592A1
WO2019029592A1 PCT/CN2018/099515 CN2018099515W WO2019029592A1 WO 2019029592 A1 WO2019029592 A1 WO 2019029592A1 CN 2018099515 W CN2018099515 W CN 2018099515W WO 2019029592 A1 WO2019029592 A1 WO 2019029592A1
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WO
WIPO (PCT)
Prior art keywords
mini
slots
aggregation
data transmission
aggregated
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2018/099515
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English (en)
Inventor
Sebastian Wagner
Umer Salim
Bruno Jechoux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JRD Communication Shenzhen Ltd
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JRD Communication Shenzhen 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.)
Filing date
Publication date
Application filed by JRD Communication Shenzhen Ltd filed Critical JRD Communication Shenzhen Ltd
Priority to CN201880050723.9A priority Critical patent/CN111213421A/zh
Publication of WO2019029592A1 publication Critical patent/WO2019029592A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows

Definitions

  • the current disclosure relates to aggregationof mini-slots in a wireless communication system.
  • Wirelesscommunication systems such as the third-generation (3G) of mobile telephone standards and technology are well known.
  • 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • the 3 rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications.
  • Communicationsystems and networks have developed towards a broadband and mobile system.
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • 5G or NR new radio
  • NR proposes an OFDM transmission format for the wireless link of the system.
  • OFDM systems utilise a number of sub-carriers spaced in frequency, each of which is modulated independently. Demodulation of the set of the sub-carriers allows recovery of the signals.
  • Time slots are defined for the scheduling of transmissions, which each slot comprising a number of OFDM symbols.
  • NR has proposed 7 or 14 OFDM symbols per slot.
  • the sub-carriers, or frequency resources, within each slot may be utilised to carry one or more channel over the link.
  • each slot may contain all uplink, all downlink, or a mixture of directions.
  • NR also proposes mini-slots (TR 38.912) which may comprise from 1 to (slot-length-1) OFDM symbols to improve scheduling flexibility.
  • Each mini-slot may start at any OFDM symbol within a slot (provided the resources are not pre-allocated to channels, for example PDCCH) .
  • Some configurations may be limited to systems over 6GHz, or to a minimum mini-slot length of 2 OFDM symbols.
  • 5G proposes a range of services to be provided, including Enhanced Mobile Broadband (eMBB) for high data rate transmission, Ultra-Reliable Low Latency Communication (URLLC) for devices requiring low latency and high link reliability, and Massive Machine-Type Communication (mMTC) to support a large number of low-power devices for a longlife-time requiring highly energy efficient communication.
  • eMBB Enhanced Mobile Broadband
  • URLLC Ultra-Reliable Low Latency Communication
  • mMTC Massive Machine-Type Communication
  • TR 38.913 defines latency as “The time it takes to successfully deliver an application layer packet/message from the radio protocol layer 2/3 SDU ingress point to the radio protocol layer 2/3 SDU egress point via the radio interface in both uplink and downlink. ”
  • the target for user plane latency is0.5ms for uplink (UL)
  • 0.5ms for downlink (DL) 0.5ms for downlink (DL) .
  • TR 38.913 defines Reliability as “Reliability can be evaluated by the success probability of transmitting X bytes within a certain delay, which is the time it takes to deliver a small data packet from the radio protocol layer 2/3 SDU ingress point to the radio protocol layer 2/3 SDU egress point of the radio interface, at a certain channel quality (e.g., coverage-edge) . ”
  • a reliability requirement for one transmission of a packet isdefined as 1x10 -5 for 32 bytes with a user plane latency of 1ms.
  • the following disclosure addresses the efficient use of mini-slots for the provision of eMBB and URLLC services.
  • the present invention is seeking to solveat least some of the outstanding problems in this domain.
  • a method of downlink data transmission from a base station to a UE in a cellular communication system utilising an OFDM modulation format comprising the steps of defining a plurality of mini-slots, each mini-slot comprising one or more OFDM symbols; aggregating a plurality of the defined mini-slots into an aggregation of mini-slots; transmitting an indication of scheduling of the aggregation of mini-slots from the base station to the UE; mapping data for transmission into the aggregation of mini-slots; and transmitting the mapped data in the mini-slots according to the scheduling.
  • the plurality of mini-slots that are aggregated may be contiguous or non-contiguous in time and/or frequency.
  • Each mini-slot may comprise a DMRS in the first OFDM symbol.
  • the aggregation may be defined according to a desired repetition rate for the DMRS.
  • the indication of scheduling may be transmitted in DCI in a PDCCH of the slot in which the first of the aggregated mini-slots occurs.
  • the DCI may include an indication of the number of mini-slots to aggregate.
  • the DCI may include an indication of aggregation pattern in time and/or frequency.
  • the mini-slots may be aggregated according to a pre-defined aggregation pattern.
  • the pre-defined aggregation pattern may be transmitted to a UE using higher layer signalling, particularly RRC signalling.
  • the pre-defined aggregation pattern may be one of a plurality of pre-defined aggregation patterns transmitted to the UE.
  • the mini-slots may be aggregated and scheduled to pre-empt previously-scheduled transmissions, wherein the indication of scheduling is transmitted on a PDCCH in the first OFDM symbol of the aggregated mini-slots.
  • the aggregated mini-slots may carry a URLLC service.
  • Each of the aggregated mini-slots may be located in the same slot.
  • the aggregated mini-slots may be located in more than one slot.
  • Aggregated mini-slots may be further aggregated to a set of aggregated mini-slots.
  • Mapping data may comprise mapping a transport block to aggregation of mini-slots.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • Figure 1 shows examples of mini-slots
  • Figure 2 shows an example of URLLC scheduling
  • Figure 3 shows examples of contiguous intra-slot aggregation
  • Figure 4 shows examples of non-contiguous intra-slot aggregation
  • Figure 5 shows an example of non-contiguous and contiguous intra-slot aggregation
  • Figure 6 shows an example of URLLC frequency aggregation
  • Figure 7 shows an example of inter-slot aggregation
  • Figure 8 shows an example of combined intra-and inter-slot aggregation.
  • Mini-slots may be aggregated to carry services while providing flexibility in the carriage of control channels.
  • a cellular communication system comprising land-based network components and remote User Equipment (UE) .
  • UE User Equipment
  • a wireless channel between a base station of the land-based network and the UE Transmissions from the base station to the UE are in the downlink direction, and transmissions from the UE to the base station are in the uplink direction.
  • the base station may comprise, or be connected to, a gNB which performs networkmanagement and control functions.
  • Figure 1 shows diagram of a slot comprising 14 OFDM symbols.
  • the PDCCH is carried by the first OFDM symbol, which channel includes control and scheduling information (in the DCI) for the slot.
  • control and scheduling information in the DCI
  • Scheduled transmissions may be later pre-empted by further PDCCH transmissions within the slot (for example as described with reference to Figure 2 below) .
  • each mini-slot utilises different time and frequency resources as required for the data to be carried.
  • the first OFDM symbol of each mini-slot contains the Demodulation Reference Signals (DMRS) .
  • DMRS Demodulation Reference Signals
  • Figure 2 shows an example of the transmission of a URLLC service which aims to provide ultra low latency.
  • scheduling information is transmitted in the PDCCH for the slot, and a first mini-slot 200 is defined and transmitted.
  • a second mini-slot 201 is defined by transmission of a further PDCCH to define a mini-slot which pre-empts the traffic originally scheduled for the resources where the second mini-slot is located.
  • the PDCCH and DMRS are transmitted, following by the PDSCH of the mini-slot in the second OFDM symbol.
  • the traffic originally scheduled for the pre-empted location must be re-scheduled in a later slot.
  • mini-slots may be aggregated to provide more efficient carriage of data. Aggregating mini-slots may reduce control overheads as one DCI can schedule multiple mini-slots, and may allow time and frequency diversity to improve channel quality. Aggregation of mini-slots may also allow greater control of DMRS placement by allowing the gNB to adapt DMRS positions and/or density according to requirements.
  • Aggregation refers to the grouping of multiple mini-slots and allocation of data to be transmitted (for example one or more transport block (TB) ) across the group of mini-slots, rather than allocating to a single mini-slot.
  • TB transport block
  • one TB is mappedacross all mini-slots in the aggregation.
  • multiple TBs can be mapped to an aggregation of mini-slots.
  • mini-slots within a single slot may be aggregated (intra-slot aggregation)
  • mini slots from multiple slots may be aggregated (inter-slot aggregation) .
  • FIG. 3 shows a slot used to transmit three groups of contiguously aggregated mini-slots.
  • Contiguous aggregation describes a configuration in which mini-slots are transmitted on an continuous series of OFDM symbols using the same frequency range.
  • Aggregation 300 comprises three mini-slots, each of which is two OFDM symbols in length, aggregation 301 comprises two mini-slots of three OFDM symbols, and aggregation 302 comprises four mini-slots of three OFDM symbols.
  • Each of the DMRSs is transmitted in the first OFDM symbol of each mini-slot, such that each aggregation carries a plurality of DMRS signals.
  • the DMRS can be located anywhere, but the current NR proposal is for transmission in the first OFDM symbol.
  • each carrying a DMRS allows the system to define the spacing (in time) of DMRS according to system requirements.
  • Longer mini-slots leads to larger spacing between DMRS signals, whereas smaller mini-slots leads to smaller spacings. For example, if it is identified that the channel is changing only slowly over time longer mini-slots can be utilised to increase the DMRS spacing. Similarly, for a given channel coherence time increasing the sub-carrier spacing shortens the OFDM symbols.
  • DMRS can thus be spaced a greater number of mini-slots apart, which corresponds to the same spacing in time.
  • each mini-slot is indicated in the DCI carried on PDCCH at the start of each slot, although some services may use mini-slots which are defined after transmissions of the PDCCH for a slot. This may be achieved by indicatingthe start position and length of each mini-slot, or the start position and end position. To enable aggregation, the level of aggregation is also to be specified.
  • each aggregation may be indicated, together with the length of the mini-slots in each aggregation, and the number of mini-slots aggregated.
  • Figure 3 would berepresented as: -
  • each aggregation may be indicated, together with the end position of the first mini-slot of each aggregation, and the number of mini-slots aggregated.
  • Figure 3 would be represented as: -
  • each aggregation may be indicated, together with the end position of the aggregation, and the number of mini-slots aggregated.
  • Figure 3 would be represented as: -
  • Each of these examples provide sufficient information for the UE to reconstruct the required mini-slot structure such that the signals can be received and decoded.
  • Other methods of configuration may also be utilised, for example the gNB may configure the UE using higher layer signalling which may indicate that a UE should use a predefined aggregation level in a semi-static manner.
  • Contiguous aggregation in frequency can be performed, but this does not provide flexibility of DMRS placement.
  • Figure 4 shows a set of examples of non-contiguous mini-slot aggregation. With non-contiguous aggregation at least one OFDM symbol exists between each consecutive mini-slot assigned to an aggregation. Each example of figure 4 shows the transmission of mini-slots for three UEs, but each mini-slot could also be utilised for different data channels from a single UE.
  • each aggregation of mini-slots is non-contiguous in time. This provides the advantages described hereinbefore to allow definition of preferable DMRS transmission spacing, and may also benefit from time diversity over the wireless channel as the mini-slots are more widely spaced in time (although a slowly-changing channel, allowing greater DMRS spacing, implies less gain from time-diversity) .
  • each aggregation of mini-slot is non-contiguousin frequency, providing frequency-diversity over the wireless channel.
  • each aggregation is non-contiguous in time and frequency.
  • the arrangement of each mini-slot can be selected to attempt to optimise the channel. For example, if a channel is quickly varying in time time-diversity may be preferred, but if a channel has strong frequency fading, frequency diversity may be preferred.
  • the location of the mini-slots and aggregation may be transmitted in a DCI on the PDCCH using similar techniques to the examples above, or another mechanism.
  • the gNB may use RRC or other higher-layer signalling to semi-statically configure mini-slots and aggregation.
  • Figure 5 shows an aggregation of four mini-slots. Two sets 500, 501 of two mini-slots are continuously aggregated in time, and those two sets 500, 501 are non-contiguously aggregated in time and frequency. Such an arrangement may be indicated using additional fields in the DCI, for example indicating the number of contiguous aggregations to use, and the pattern of non-contiguous aggregations.
  • the aggregation techniques described hereinbefore may be applied to mini-slots which are scheduled after the DCI for a slot and which pre-empt already-scheduled transmissions.
  • URLLC transmissions may pre-empt other transmissions due to the low latency requirements of the URLLC service.
  • Non-contiguous frequency aggregation may therefore be preferable, as shown in the example of Figure 6.
  • PDCCH For pre-empted mini-slots the PDCCH must be sent within the mini-slot itself. In the example of Figure 6 PDCCH is transmitted in one of the aggregated mini-slots since this provides sufficient capacity to indicate the aggregation configuration.
  • the other mini-slots comprise a DMRS in the first OFDM system, but no PDCCH.
  • Aggregation for pre-empted mini-slots may be less advantageous due to the increased disruption of other traffic, but also non-contiguous aggregation may be used to fit transmissions around other on-going transmissions and thus minimise pre-emption.
  • mini-slots from multiple slots can be aggregated.
  • the resource allocation can be the same or different in each slot.
  • a frequency-hopping pattern can be defined for each UE such that the frequency resources of each mini-slot varies according to the pattern.
  • Figure 7 illustrates an example of aggregating mini-slots from multiple slots.
  • three mini-slots using varying frequency resources are aggregated for UE1, and three mini-slots using the same frequency resources are aggregated for UE2.
  • the frequency resource pattern for UE1 in Figure 7 is shown for example only and any appropriate pattern may be utilised.
  • the mini-slots do not need to use the same time resources in each slot, but those resources may vary. For example, time andfrequency resources may be selected dependent on channel performance, or to make the best use of resources.
  • the resources may be defined dynamically, or time-frequency hopping patterns may be defined per UE by the gNB via higher layer signalling (or other communication means) .
  • the mini-slots do not need to be from a contiguous series of slots, but may use a non-contiguous series.
  • An intra-slot aggregation of mini-slots can also be itself aggregated through inter-slot aggregation.
  • the intra-slot aggregation example of Figure 5 can be aggregated over N slots. That is, the intra-slot aggregation repeats every kth slot for a total of N aggregated slots.
  • the inter-slot aggregation of mini-slots can be configured in the DCI by indicatingthe number of aggregations.
  • the time-frequency hopping pattern for inter slot aggregation can be signalled via higher layers signalling to the UEs, or configured dynamically also in the DCI.
  • each mini-slot in an aggregation is of the same length.
  • the scheduling information may include anadditional indication that one or more mini-slots in an aggregated set are of a different length. For example, a flag may indicate the final mini-slot has one extra OFDM symbol.
  • signalling overhead would increase, it is also possible for each mini-slot in an aggregation to be defined with a specific length, thus allowing complete flexibility in the structure of the aggregation.
  • any of the devices or apparatus that form part of the network may include at least a processor, a storage unit and a communications interface, wherein the processor unit, storage unit, and communications interface are configured to perform the method of any aspect of the present invention. Further options and choices are described below.
  • the signal processing functionality of the embodiments of the invention especially the gNB andthe UE may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptopor notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can beused.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor.
  • main memory such as random access memory (RAM) or other dynamic memory
  • main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system maylikewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetictape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and aninterface , such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • computer program product may be used generally to refer to tangible media such as, for example, a memory, storage device, or storage unit.
  • These and other forms of computer-readable media may store one or more instructions for use by the processor comprising the computer system to cause the processor to perform specified operations.
  • Such instructions generally referred to as ‘computer program code’ (which may be grouped in the form of computer programs or other groupings) , when executed, enable the computing systemto perform functions of embodiments of the present invention.
  • the code may directly cause a processor to perform specified operations, be compiled to do so, and/or be combined with other software, hardware, and/or firmware elements (e.g., libraries for performing standard functions) to do so.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory
  • the software may be stored in a computer-readable medium and loaded into computing systemusing, for example, removable storage drive.
  • a control module in this example, software instructions or executable computer program code
  • the processor in the computer system when executed by the processor in the computer system, causes a processorto perform the functions of the invention as described herein.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or anyother sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • aspects of the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the invention may optionally be implemented, atleast partly, as computer software running on one or more data processors and/or digital signal processors or configurable module components such as FPGA devices.
  • the elements and components of an embodiment of the invention may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des procédés et des systèmes d'agrégation de mini-créneaux dans un système de transmission OFDM. Des mini-créneaux sont agrégés en temps et/ou en fréquence et utilisés pour transporter des données. L'agrégation peut permettre à une configuration d'une transmission DMRS de s'adapter à des conditions de surdébit et de canal.
PCT/CN2018/099515 2017-08-11 2018-08-09 Agrégation de créneaux Ceased WO2019029592A1 (fr)

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GB1712895.0A GB2565344B (en) 2017-08-11 2017-08-11 Slot aggregation

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CN112262607B (zh) * 2018-12-26 2024-03-05 Oppo广东移动通信有限公司 一种dmrs配置方法、终端设备及网络设备
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