WO2020237671A1 - Configuration de signal de référence de démodulation pour transmission de liaison latérale - Google Patents

Configuration de signal de référence de démodulation pour transmission de liaison latérale Download PDF

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Publication number
WO2020237671A1
WO2020237671A1 PCT/CN2019/089661 CN2019089661W WO2020237671A1 WO 2020237671 A1 WO2020237671 A1 WO 2020237671A1 CN 2019089661 W CN2019089661 W CN 2019089661W WO 2020237671 A1 WO2020237671 A1 WO 2020237671A1
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Prior art keywords
scrambling
communication device
identities
identity
scrambling identity
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PCT/CN2019/089661
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English (en)
Inventor
Dong Li
Yong Liu
Original Assignee
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 CN201980096958.6A priority Critical patent/CN113892246A/zh
Priority to PCT/CN2019/089661 priority patent/WO2020237671A1/fr
Publication of WO2020237671A1 publication Critical patent/WO2020237671A1/fr

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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
    • H04L5/0053—Allocation of signaling, 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels

Definitions

  • Example embodiments of the present disclosure generally relate to the field of communications, and in particular, to devices, methods, apparatuses and computer readable storage media of demodulation reference signal (DMRS) configuration for sidelink (SL) transmission.
  • DMRS demodulation reference signal
  • V2X sidelink Long Term Evolution (LTE) Vehicle-to-everything (V2X) sidelink is specified in LTE Release 14 (R14) to allow a direct communication between a vehicle and a vehicle, pedestrian or infrastructure in basic road safety services.
  • LTE Release 15 V2X sidelink is further enhanced with the features related to carrier aggregation, higher order modulation and latency reduction to provide more diversified services and meet more stringent service requirements.
  • NR V2X New Radio
  • 3GPP Third Generation Partnership Project
  • a NR NodeB In SL mode-1, a NR NodeB (or gNB) dynamically schedules a SL transmission resource for each SL transport block (TB) , for example, via downlink control information (DCI) .
  • DCI downlink control information
  • the gNB schedules a SL transmission resource, for example, via a type-1 or type-2 configured grant in a semi-persistent manner.
  • RRC Radio Resource Control
  • RRC Radio Resource Control
  • RRC Radio Resource Control
  • the type-2 configured grant RRC signaling is used for the SL scheduling, and the SL (de) activation is triggered by dynamic signaling such as DCI.
  • SL mode-2 a SL transmission resource is selected by user equipment (UE) autonomously based on sensing and measurements of a sidelink channel.
  • UE user equipment
  • Such UE-autonomous resource selection in SL mode-2 may lead to some collisions in the resource selection, which may induce significant interferences.
  • example embodiments of the present disclosure provide devices, methods, apparatuses and computer readable storage media of demodulation reference signal (DMRS) configuration for sidelink (SL) transmission.
  • DMRS demodulation reference signal
  • a first communication device comprises at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the first communication device to generate sidelink control information associated with sidelink transmission to a second communication device.
  • the first communication device is then caused to select a scrambling identity from a predefined set of scrambling identities based on the sidelink control information adjusted by randomly setting one or more values for one or more of a plurality of bits included in the sidelink control information.
  • the first communication device is further caused to generate, based on the scrambling identity, a demodulation reference signal sequence for the sidelink transmission, and perform the sidelink transmission to the second communication device based on the demodulation reference signal sequence.
  • a third communication device comprises at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the third communication device to select from a predefined set of scrambling identities, one or more scrambling identities for generating a demodulation reference signal sequence for sidelink transmission in a communication area.
  • the third communication device is further caused to broadcast the one or more scrambling identities via a first message in the communication area.
  • a method in the method, a first communication device generates sidelink control information associated with sidelink transmission to a second communication device.
  • the first communication device selects a scrambling identity from a predefined set of scrambling identities based on the sidelink control information adjusted by randomly setting one or more values for one or more of a plurality of bits included in the sidelink control information.
  • the first communication device further generates, based on the scrambling identity, a demodulation reference signal sequence for the sidelink transmission, and performs the sidelink transmission to the second communication device based on the demodulation reference signal sequence.
  • a method is provided.
  • a third communication device selects, from a predefined set of scrambling identities, one or more scrambling identities for generating a demodulation reference signal sequence for sidelink transmission in a communication area.
  • the third communication device broadcasts the one or more scrambling identities via a first message in the communication area.
  • an apparatus comprising means for performing the steps of the method according to the third or fourth aspect.
  • a computer readable storage medium comprising program instructions stored thereon. The instructions, when executed by a processor of a device, cause the device to perform the method according to the third or fourth aspect.
  • FIG. 1 illustrates an example scenario in which some example embodiments of the present disclosure can be implemented
  • FIG. 2 illustrates a flowchart of an example method for sidelink transmission according to some example embodiments of the present disclosure
  • FIG. 3 illustrates an example process of generating a DMRS sequence in SL mode-2 according to some example embodiments of the present disclosure
  • FIG. 4 illustrates a flowchart of an example method of scheduling a scrambling identity according to some example embodiments of the present disclosure
  • FIG. 5 illustrates an example messaging flow of scheduling a DMRS sequence according to some example embodiments of the present disclosure
  • FIG. 6 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • the term “communication device” refers to any suitable device that is capable of communications in a communication network.
  • the communication device may comprise a terminal device and a network device.
  • terminal device or “user equipment” (UE) refers to any terminal device capable of wireless communications with each other or with the base station.
  • the communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air.
  • the UE may be configured to transmit and/or receive information without direct human interaction. For example, the UE may transmit information to the network device on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.
  • Examples of the UE include, but are not limited to, user equipment (UE) such as smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , wireless customer-premises equipment (CPE) , sensors, metering devices, personal wearables such as watches etc., and/or vehicles that are capable of communication.
  • UE user equipment
  • LME laptop-embedded equipment
  • LME laptop-mounted equipment
  • CPE wireless customer-premises equipment
  • sensors metering devices
  • personal wearables personal wearables
  • vehicles that are capable of communication.
  • the terminal device may also include vehicles in V2x communications via D2D sidelink.
  • the term “network device” refers to a device via which services can be provided to a terminal device in a communication network.
  • the network device may include a relay, an access point (AP) , a transmission point (TRP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a New Radio (NR) NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like.
  • AP access point
  • TRP transmission point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • gNB New Radio
  • RRU Remote Radio Module
  • RH radio header
  • RRH remote radio head
  • a low power node such as a femto, a pico, and
  • the term “communication area” refers to any useful area in the communication network.
  • the communication area may comprise one or more cells served or covered by a network device.
  • the terminal device can perform sidelink transmission in the communication area.
  • circuitry may refer to one or more or all of the following:
  • combinations of hardware circuits and software such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular network device, or other computing or network device.
  • first As used herein, the terms “first” , “second” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be referred to as a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.
  • SL mode-2 the resource for SL transmission is selected by UE autonomously based on the sensing and measurements of a SL channel. Even with the SL channel sensing, such UE-autonomous resource selection in SL mode-2 may still lead to some collisions in the resource selection, and interferences due to the collisions impose challenges on a SL design.
  • the semi-persistent scheduling may be used to reduce the signaling overhead.
  • packet sizes for different TB transmissions may be varied in a large dynamic range.
  • the periodic packet sizes can vary from 30000 bytes to 60000 bytes randomly. This brings some challenges for the semi-persistent resource allocation. For example, if the resource is allocated for the possibly maximum packet size, it will lead to some resource wastes in the case that only small packets are transmitted. In order to avoid such resource wastes and accommodate the possibly largest packet at the same time, it is considered to schedule a plurality of UEs to share statistically the same semi-persistent resources. In such resource sharing, collisions of the resource selection may also occur. Therefore, there is a need to mitigate the collisions and interferences in both SL mode-1 and SL mode-2.
  • a Zadoff-Chu sequene is used as a Demodulation Reference Signal (DMRS) sequence.
  • DMRS Demodulation Reference Signal
  • the use of the Zadoff-Chu sequence may match well with low Peak-to-Average Power Ratio (PAPR) of a sidelink waveform of Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiple Access (DFT-s-OFDMA) . Due to the relatively small number of the available Zadoff-Chu sequences, there is typically only a set of 30 DMRS sequences for selection.
  • PAPR Peak-to-Average Power Ratio
  • DFT-s-OFDMA Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiple Access
  • One of the 30 DMRS sequences may be selected for a PSSCH based on Cyclic Redundancy Check (CRC) bits transmitted on a sidelink control channel (PSCCH) associated with the PSSCH.
  • CRC Cyclic Redundancy Check
  • PSCCH sidelink control channel
  • This DMRS sequence configuration or selection may be used in both eNB-scheduled resource allocation (referred to as mode-3 in LTE V2X) and UE-autonomous resource allocation (referred to as mode-4 in LTE V2X) . Due to the limited number of the available DMRS sequences, there is a relatively large probability that the same DMRS is selected or allocated for two or more UEs.
  • a two-stage Sidelink Control Information (SCI) structure is under discussion to adapt to various traffic types and application scenarios.
  • minimum control information for SL transmission such as a priority, a resource indication and the like, may be conveyed by the first-stage SCI, which is decodable by all sidelink UEs for purpose of sensing the sidelink channel, for example.
  • the other control information for SL transmission would be conveyed by the second-stage SCI to a specific UE or a target receiver, which may include a Modulation Coding Scheme (MCS) , parameters related to Multiple-Input Multiple-Output (MIMO) or hybrid automatic repeat quest (HARQ) and the like.
  • MCS Modulation Coding Scheme
  • MIMO Multiple-Input Multiple-Output
  • HARQ hybrid automatic repeat quest
  • the same DMRS sequence may be selected by two or more UEs for the corresponding PSSCHs. If these UEs select the same resources for SL transmission, there is little opportunity for the receivers to detect the SL transmission from the different UEs, which would seriously degrade the performance and efficiency of the sidelink transmission.
  • Embodiments of the present disclosure propose a configuration scheme of a demodulation reference signal (DMRS) sequence for SL transmission, for example, on a PSSCH in SL mode-1 (or a gNB-scheduling resource allocation mode) or SL mode-2 (or UE-autonomous resource allocation mode) or mixed modes.
  • a scrambling identity (ID) for generating a DMRS sequence used in SL transmission is selected by a communication device autonomously from a predefined set of scrambling identities. The autonomous selection is based on SCI adjusted by randomly changing one or more of a plurality of bits included in SCI.
  • different scrambling identities may be selected by different transmitter UEs even if they generate the same control information in SCI except the reserved bits, and therefore the resulting DMRS sequences may be different. In this way, the collisions of the DMRS sequences generated by different communication devices may be reduced significantly.
  • less control information such as only time and frequency resources, a priority and the like may be included in the first stage SCI, and thus two UEs that occasionally select the same resources may probably select the same DMRS sequence.
  • the above selection scheme of the scrambling identity may reduce the collisions between the DMRS sequences significantly.
  • the scrambling identity is scheduled instead of selected autonomously.
  • a further communication device such as a network device selects one or more scrambling identities from a predefined set of scrambling identities and broadcast the one or more scrambling identities in a communication area such as a cell. As such, all the communication devices in the communication area can obtain the scrambling identities.
  • the network device can make full control of the scheduling of DMRS sequences for relevant communication devices such that the potential collision interference of the resulting DMRS sequences may be minimized.
  • these UEs can be scheduled to share the same periodic resources with configured grant.
  • the same DMRS sequence can be allocated to these UEs with orthogonal antenna ports by the network device. In this way, the system spectral efficiency is improved and at the same time the potential collision interference is avoided/mitigated well.
  • FIG. 1 shows an example environment 100 in which example embodiments of the present disclosure can be implemented.
  • the environment 100 which may be a part of a communication network, comprises three communication devices 110, 120 and 130, referred to as a first communication device 110, a second communication device 120 and a third communication device 130, respectively.
  • the first and second communication devices 110 and 120 may be implemented by a terminal device.
  • the first and second communication devices 110 and 120 may implemented by vehicles.
  • the third communication device 130 may be implemented by a network device such as a gNB as shown. It is possible that the third communication device 130 is also implemented by a terminal device.
  • the first and second communication devices 110 and 120 are located in a communication area 140.
  • the communication area 140 is covered by the third communication device 130 such that the third communication device 130 can broadcast in the communication area 140.
  • the communication area 140 may be any suitable area in the environment 100.
  • the communication area 140 may comprise one or more cells served by the third communication device 130 acting as a network device.
  • three communication devices are shown to be included in the environment 100 only for the purpose of illustration, without suggesting any limitation to the scope of the present disclosure. Any suitable number of devices may be included in the environment 100. For example, there may be more than two communication devices in the communication area 140. It is also possible that the second communication device 120 is not in the communication area 140.
  • the first and second communication devices 110 and 120 can communicate with the third communication device 130.
  • the first and second communication devices 110 and 120 can also communication with each other or with communication devices (not shown) directly or via the third communication device 130.
  • the communications may follow any suitable communication standards or protocols such as Universal Mobile Telecommunications System (UMTS) , long term evolution (LTE) , LTE-Advanced (LTE-A) , the fifth generation (5G) NR, Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards.
  • UMTS Universal Mobile Telecommunications System
  • LTE long term evolution
  • LTE-A LTE-Advanced
  • 5G Fifth Generation
  • Wi-Fi Wireless Fidelity
  • WiMAX Worldwide Interoperability for Microwave Access
  • the communications may employ any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiplexing (OFDM) , time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, machine type communication (MTC) , enhanced mobile broadband (eMBB) , massive machine type communication (mMTC) , ultra-reliable low latency communication (URLLC) , Carrier Aggregation (CA) , Dual Connectivity (DC) , and sidelink (SL) technologies.
  • MIMO Multiple-Input Multiple-Output
  • OFDM Orthogonal Frequency Division Multiplexing
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • Bluetooth ZigBee
  • MTC machine type communication
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC ultra-reliable low latency communication
  • the first communication device 110 can perform sidelink (SL) transmission to the second communication device 120.
  • the first communication device 110 For the SL transmission, the first communication device 110 generates a DMRS sequence based on a scrambling identity.
  • the scrambling identity is selected by the first communication device 110 from a predefined set of scrambling identifies. The selection of the scrambling identity based on the SCI which is generated by the first device 110 and then adjusted by randomly changing one or more of a plurality of bits included in the SCI.
  • the scrambling identity is obtained by the first communication device 110 from the third communication device 130 which selects the scrambling identity from the predefined set of scrambling identifies.
  • FIG. 2 shows a flowchart of an example method 200 for sidelink transmission according to some example embodiments of the present disclosure.
  • the method 200 can be implemented by the first communication device 110 or the second communication device 120 as shown in FIG. 1. For the purpose of discussion, the method 200 will be described with reference to FIG. 1.
  • the first communication device 110 generates sidelink control information (SCI) associated with SL transmission to the second communication device 120.
  • SCI may include any control information associated with the SL transmission, such as a resource, a MCS, a transmission interval and the like.
  • the SCI may include a plurality of bits including information bits and reserved bits.
  • the first communication device 110 selects a scrambling identity from a predefined set of scrambling identities based on the SCI adjusted by randomly setting one or more values for one or more of the plurality of bits included in the SCI.
  • the predefined set of scrambling identities may be predefined or (pre) configured on a network side.
  • one or more of a plurality of reserved bits included in the SCI are randomly changed.
  • the first communication device 110 may randomly set one or more of the plurality of reserved bits as zero and others of the plurality of reserved bits as one.
  • the first communication device 110 may determine, with a predetermined probability, whether the reserved bit is to be set as zero or one and then implement the corresponding settings.
  • the predetermined probability may be set as 0.5 to maximize the randomization of the values of the respective reserved bits. Other probabilities may be also possible depending on the specific implementations.
  • the terminal device 110 selects the scrambling identity from the predefined set of scrambling identities based on the adjusted SCI. For example, the first communication device 110 may generate a plurality of CRC bits based on the adjusted SCI. A specific CRC generation polynomial may be used for the generation of the CRC bits. At least a part of the generated CRC bits is then mapped to an index of a scrambling identity. The scrambling identity with the mapped index is selected from the predefined set of scrambling identities.
  • the randomization of the bits or reserved bits in the SCI can reduce the probability that the two UEs generate the same CRC bits and then select the same scrambling identity which may finally result in the collisions of the generated DMRS sequences.
  • the first communication device 110 Based on the scrambling identity, at block 215, the first communication device 110 generates a DMRS sequence for the SL transmission to the second communication device 120.
  • a sequence generator for generating the DMRS sequence is initialized based on the scrambling identity. For example, the scrambling identity may be used, potentially together with the index of CP-OFDM symbol for DMRS, to determine a DMRS initialization seed for the sequence generator. Then, the initialized sequence generator is used to generate a pseudo-random binary sequence which is further used to generate the DMRS sequence.
  • An example algorithm of generating a DMRS sequence will be discussed below.
  • the DMRS sequence is generated by a sequence generator with a sequence initialization seed.
  • the DMRS sequence may be implemented by a Gold sequence.
  • the sequence initialization seed may be a function of a scrambling identity as well as an index of CP-OFDM symbol for the DMRS sequence.
  • a DMRS sequence for the PSSCH employs a Quadrature Phase Shift Keying (QPSK) symbol sequence which is based on a Gold sequence as defined in NR Rel-15 specifications (for example, in section 6.4.1 of 3GPP TS38.211 V15.5.0) .
  • QPSK Quadrature Phase Shift Keying
  • a pseudo-random sequence c (i) represents a binary sequence which is implemented by a Gold sequence as defined in clause 5.2.1 of 3GPP TS38.211 V15.5.0, for example.
  • the sequence generator for generating the pseudo-random sequence is initialized with:
  • N SCID is assumed that N SCID is equal to an integer power of 2
  • the scrambling identity is not larger than 65535 which thus can be expressed by 16 bits.
  • the scrambling identity is selected from a predefined set of scrambling identities in a pseudo-random manner based on the CRC bits of a PSCCH as a control channel associated with the PSSCH.
  • This set of scrambling identities may be predefined for SL mode-2, which will be referred to as a scrambling ID set 2, S 2 .
  • the scrambling ID set2, S 2 may be a subset of a set ⁇ 0, 1, ..., 65535 ⁇ , and it is assumed that a cardinality of the scrambling ID set 2, S 2 , is an integer power of 2.
  • the scrambling ID set 2, S 2 can be set to ⁇ 0, 1, 2, ..., 32767 ⁇ .
  • the scrambling identity may be selected from a predefined set of scrambling identities defined for this mode, which will be referred to as a scrambling ID set 1, S 1 .
  • the scrambling ID set 1, S 1 may or may not be the same as the scrambling identity set 2, S 2 .
  • the scrambling identity set 1, S 1 may be different from the scrambling ID set 2, S 2 , over the total set.
  • the scrambling identity set 1, S 1 may be set as a subset ⁇ 32768, 32769, ..., 65535 ⁇ different from the scrambling ID set 2, S 2 , ⁇ 0, 1, 2, ..., 32767 ⁇ under the assumption that the total scrambling ID set is ⁇ 0, 1, 2, ..., 65535 ⁇ .
  • the SCI (or a part of the SCI in case of the 2-stage SCI structure) is conveyed on the PSCCH.
  • the bits included in the SCI are represented as ⁇ a 0 , a 1 , a 2 , ..., a A-1 ⁇ where A represents the total number of bits in the SCI.
  • a bits only the first B bits (referred to as information bits) convey real information fields, and the remaining A-B bits are reserved bits which are usually set to zero.
  • Each of the A-B number of reserved bits ⁇ a B , a B+1 , ..., a A-1 ⁇ is randomly set to zero or one with a probability of 50%.
  • the CRC bits may be calculated from the A bits included in the SCI based on a specific form of a cyclic generator polynomial.
  • the scrambling identity may be determined as:
  • S 2 (k+1) represents the (k+1) th element of the scrambling ID set 2, S 2 .
  • FIG. 3 shows an example process 300 of generating a DMRS sequence in SL mode-2 according to some example embodiments of the present disclosure.
  • the first communication device 110 generates SCI 305 with a SCI size 310.
  • the SCI 305 includes fields of SCI 315 (including information bits) and reserved bits 320.
  • each of the reserved bits 320 are randomized (325) to one or zero.
  • the CRC encoding is performed (330) to generate a plurality of CRC bits 340.
  • An index of a scrambling ID is generated (345) based on at least partial CRC bits.
  • the scrambling ID with the index is selected (350) from the scrambling ID set 2, S 2 .
  • the initialization of the sequence generator is performed (355) based on the scrambling ID as well as a symbol index.
  • the DMRS sequence is generated (360) .
  • the first communication device 110 may first determine whether the selection is to be triggered. The determination may be implemented based on a mode of the SL transmission. For example, if the mode of the SL transmission is a predetermined mode, the first communication device 110 may determine that the selection is to be performed. In some example embodiments, in SL mode-2, the first communication device 110 may determine that the scrambling identity is to be selected from the predefined set of scrambling identities. In SL mode-1, the first communication device 110 may also determine that the selection is to be performed.
  • the scrambling identity may be scheduled.
  • the terminal device 110 may determine whether to perform the selection of the scrambling identity depending on whether to receive a scrambling identity from the third communication device 130.
  • the first communication device 110 may receive one or more scrambling identities from the third communication device 130.
  • the one or more scrambling identities may be received by first communication device 110 via a message (referred to as a first message) .
  • the first message may be broadcast by the third communication device 130 in the communication area 140 so that all the communication devices in the communication area 140 can obtain the scrambling identities.
  • the first message may comprise common signaling in at least a communication area (for example, the communication area 140) covered by the third communication device 130 if the third communication device 130 acts as a network device. Accordingly, in response to the reception of the one or more scrambling identities, the first communication device 110 will determine that the selection is not performed. If no scrambling identities are received, the first communication device 110 will determine that the selection is to be performed.
  • the first communication device 110 may receive an indication of a scrambling identity of the plurality of scrambling identities from the third communication device 130.
  • the indication may be received by the first communication device 110 in a further message (referred to as a second message) .
  • the second message may comprise signaling specific to the first communication device 110.
  • the second message may comprise UE-specific signaling such as Radio Resource Control (RRC) signaling or dynamic Downlink Control Information (DCI) signaling.
  • RRC Radio Resource Control
  • DCI dynamic Downlink Control Information
  • the first communication device 110 may receive an indication of one or more antenna ports from the third communication device 130.
  • the first communication device 110 may be scheduled by the third communication device 130 to use the same time and frequency resource with a further communication device (referred to as a fourth communication device) in the case that the third communication device 130 acts as a network device and the first and fourth communication devices act as terminal devices.
  • the third communication device 130 may also allocate the same scrambling ID to the first and fourth communication devices.
  • the third communication device 130 may allocate orthogonal antenna ports to the first and fourth communication devices. Accordingly, the first communication device 110 may receive an indication of the one or more antenna ports from the third communication device 130 in the second message, for example.
  • the indication of the scrambling identity is received by the first communication device 110 before the first communication device 110 generates the SCI at block 205.
  • the first communication device 110 may include the indication of the scrambling identity received from the third communication device 130 into the SCI.
  • the first communication device 110 sends the SCI to the second communication device 120, for example, on a PSCCH associated with a PSSCH for SL transmission.
  • the second communication device 120 can be aware of the scrambling identity used by the first communication device 110 and detect the SL transmission from the first communication device 110 using the scrambling identity. As such, the SL transmission efficiency may be further improved.
  • the first communication device 110 performs the SL transmission to the second communication device 120 based on the DMRS sequence.
  • the configuration scheme of the DMRS sequence as discussed above may reduce the collisions and interferences in the SL transmission and thereby improve the transmission efficiency and system performance.
  • the resulting DMRS sequence used by the first communication device 110 may be different from those used by other communication devices.
  • the first communication device 110 may also use a different scrambling identity for the DMRS sequence generation compared with other communication devices such as the second communication device 120. Example embodiments in this regard will be further discussed below with reference FIGS. 4 and 5.
  • FIG. 4 shows a flowchart of an example method 400 of scheduling a scrambling identity according to some example embodiments of the present disclosure.
  • the method 400 can be implemented by the third communication device 130 as shown in FIG. 1.
  • the method 400 will be described with reference to FIG. 1.
  • the third communication device 130 selects one or more scrambling identities from a predefined set of scrambling identities.
  • the set of scrambling identities may be predefined or (pre) configured per mode.
  • a set scrambling identities for SL mode-1 may be different from a set of scrambling identities for SL mode-2.
  • the third communication device 130 broadcasts the one or more scrambling identities via the first message in the communication area 140.
  • the first message may be any suitable broadcast message.
  • the third communication device 130 acts as a network device and the first communication device 110 acts as a terminal device
  • the first message may comprise common signaling in at least a communication area such as the communication area 140 covered by the third communication device 130.
  • the first communication device 110 uses this scrambling identity to generate the DMRS sequence.
  • the third communication device 130 may allocate a plurality of scrambling identities for use in the communication area 140. In these embodiments, the third communication device 130 may allocate one of the scrambling identities to the first communication device 110 and send an indication of the scrambling identity to the first communication device 110 in the second message.
  • the second message may comprise signaling specific to the first communication device 110.
  • the signaling specific to the first communication device 110 may comprise UE-specific signaling such as RRC signaling or DCI signaling when the first communication device 110 acts as a terminal device and the third communication device 130 acts as a network device.
  • the third communication device 130 may schedule the first communication device 110 to share the same time and frequency resources and the same DMRS sequence with other communication devices (for example, the fourth communication device) , for example, in SL mode-1. In some example embodiments, the third communication device 130 may allocate the same scrambling ID to the first and fourth communication devices. In this case, the third communication device 130 may allocate one or more antenna ports (referred to as a first set of antenna ports) to the first communication device 110 and allocate one or more antenna ports (referred to as a second set of antenna ports) to the fourth communication device. The first set of antenna ports are orthogonal to the second set of antenna ports.
  • the third communication device 130 may generate a plurality of orthogonal antenna ports based on the same DMRS sequence. These antenna ports may be orthogonal in a frequency, code or time domain.
  • the third communication device 130 may allocate the first set of the orthogonal antenna ports to the first communication device 110 and the second set of the orthogonal antenna ports to the fourth communication device.
  • the third communication device 130 may send an indication of the first set of antenna ports to the first communication device 110 in the second message.
  • the orthogonalization of the antenna ports will be used by different communication devices, which may reduce the collisions and interferences of the SL transmissions from these devices.
  • DMRS sequences may be configured for these communication devices. Based on each DMRS sequence, a plurality of orthogonal antenna ports may be generated and allocated to a plurality of communication devices.
  • the first communication device 110 may select the scrambling identity from a predefined set of scrambling identities as described above with reference to FIGS. 2 and 3. The details will not be repeated for the purpose of simplification.
  • FIG. 5 shows an example messaging flow 500 of scheduling a DMRS sequence according to some example embodiments of the present disclosure.
  • the third communication device 130 is implemented by a gNB, and the first communication device 110 is implemented by a UE.
  • the third communication device 130 also schedules the fourth communication device 505 which is implemented by a further UE within the communication area 140 such as a cell covered by the third communication device 130.
  • Both the first and fourth communication devices 110 and 505 operate in in SL mode-1.
  • the two communication devices 110 and 505 perform the SL transmission with the type-1 configured grant resources.
  • the third communication device 130 (for example, a gNB) selects (510) one or more scrambling identities from the scrambling ID set 1, S 1 .
  • the third communication device 130 broadcasts (515) the one or more scrambling identities in the communication area 140 (for example, in the entire cell as a part of the system information) .
  • all the communication devices in the coverage of the third communication device 130 can receive and get aware of the information of configured scrambling identities, irrespective of a RRC connection state.
  • the third communication device 130 receives (520) a scheduling request (SR) or buffer status request (BSR) for SL periodic traffic from the first communication device 110.
  • the third communication device 130 may allocates the resource through high layer signaling for the semi-persistent scheduling.
  • the first and fourth communication devices 110 and 505 have similar traffic profile.
  • the two communication devices 110 and 505 may have a specific periodicity but variant packet sizes (for example, in the range of 30000 bytes to 60000 bytes) .
  • the third communication device 130 schedules the two communication devices 110 and 505 to share the same configured resources to improve the resource efficiency.
  • the third communication device 130 may have to allocate the periodic resources with a sufficient resource size to accommodate the potentially maximum packet size. Such resource allocation may lead to some resource wastes considering that the packet size for transmission may be much smaller than the maximum potential size.
  • the third communication device 130 may configure the same scrambling identity, together with the orthogonal antenna ports, for the two communication devices 110 and 505.
  • the antenna ports may be orthogonal in a frequency, code or time domain, for example.
  • the mapping of the DMRS sequence to the resource may be resource specific. That is, the DMRS sequence is virtually mapped to an entire carrier or a resource pool, but only a section of the DMRS sequence corresponding to the frequency resource for the PSSCH is actually transmitted. Accordingly, the orthogonalization of the antenna ports could be achieved whether the first and fourth communication devices 110 and 505 are fully collided or partially collided in frequency. The collisions and interferences may be mitigated by the accurate channel estimation with the orthogonal antenna ports.
  • the third communication device 130 After receiving (520) the SR or BSR, the third communication device 130 sends (525) to the first communication device 110 a type-1 configured grant including an index of the scrambling ID, indication of the orthogonal antenna ports, and the like.
  • the third communication device 130 in response to receiving (530) a SR or BSR for SL periodic traffic from the fourth communication device 505, the third communication device 130 sends (535) to the fourth communication device 505 a type-1 configured grant including an index of the scrambling ID, indication of the orthogonal antenna ports, and the like.
  • the first communication device 110 performs (540) the SL transmissions to the corresponding target receiver, and the fourth communication device 505 performs (545) the SL transmissions to the corresponding target receiver.
  • FIG. 6 is a simplified block diagram of a device 600 that is suitable for implementing example embodiments of the present disclosure.
  • the device 600 can be implemented at the first communication device 110 or the third communication device 130 as shown in FIG. 1.
  • the device 600 includes a processor 610, a memory 620 coupled to the processor 610, a communication module 630 coupled to the processor 610, and a communication interface (not shown) coupled to the communication module 630.
  • the memory 620 stores at least a program 640.
  • the communication module 630 is for bidirectional communications, for example, via multiple antennas.
  • the communication interface may represent any interface that is necessary for communication.
  • the program 640 is assumed to include program instructions that, when executed by the associated processor 610, enable the device 600 to operate in accordance with the example embodiments of the present disclosure, as discussed herein with reference to FIGS. 1-5.
  • the example embodiments herein may be implemented by computer software executable by the processor 610 of the device 600, or by hardware, or by a combination of software and hardware.
  • the processor 610 may be configured to implement various example embodiments of the present disclosure.
  • the memory 620 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 620 is shown in the device 600, there may be several physically distinct memory modules in the device 600.
  • the processor 610 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 600 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the processor 610 and the communication module 630 may cooperate to implement the methods 200 and 400 as described above with reference to FIGS. 2-5.
  • various example embodiments of the present disclosure 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. While various aspects of example embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method 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.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the methods 200 and 400 as described above with reference to FIGS. 2-5.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various example embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage medium.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, a computer readable medium and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , Digital Versatile Disc (DVD) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • DVD Digital Versatile Disc
  • an optical storage device a magnetic storage device, or any suitable combination of the foregoing.
  • a first communication device comprises: at least one processor; and at least one 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 device to: generate sidelink control information associated with sidelink transmission to a second communication device; select a scrambling identity from a predefined set of scrambling identities based on the sidelink control information adjusted by randomly setting one or more values for one or more of a plurality of bits included in the sidelink control information; generate, based on the scrambling identity, a demodulation reference signal sequence for the sidelink transmission; and perform the sidelink transmission to the second communication device based on the demodulation reference signal sequence.
  • the plurality of bits comprise a plurality of reserved bits
  • the first communication device is caused to select the scrambling identity from the predefined set of scrambling identities by: randomly setting one or more of the plurality of reserved bits as zero and others of the plurality of reserved bits as one, to adjust the sidelink control information; and selecting the scrambling identity from the predefined set of scrambling identities based on the adjusted sidelink control information.
  • the first communication device is caused to randomly set the one or more of the plurality of reserved bits as zero and the others of the plurality of reserved bits as one by: for each of the plurality of reserved bits, determining, with a predetermined probability, whether the reserved bit is to be set as zero or one; and setting the reserved bit as zero or one based on the determining.
  • the first communication device is caused to select the scrambling identity from the predefined set of scrambling identities by: generating a plurality of cyclic redundancy check bits based on the adjusted sidelink control information; mapping at least a part of the plurality of cyclic redundancy check bits into an index of a scrambling identity; and selecting, from the predefined set of scrambling identities, a scrambling identity associated with the mapped index as the scrambling identity.
  • the first communication device is caused to generate the demodulation reference signal sequence based on the scrambling identity by: initializing, based on the scrambling identity, a sequence generator for generating the demodulation reference signal sequence; generating a pseudo-random binary sequence using the initialized sequence generator; and generating the demodulation reference signal sequence using the generated pseudo-random binary sequence.
  • the first communication device is caused to select the scrambling identity from the predefined set of scrambling identities by: determining whether the scrambling identity is to be selected from the predefined set of scrambling identities; and in response to determining that the scrambling identity is to be selected, selecting the scrambling identity from the predefined set of scrambling identities.
  • the first communication device is caused to determine whether the scrambling identity is to be selected by: determining whether a mode of the sidelink transmission is a predetermined mode; and in response to determining that the mode of the sidelink transmission is the predetermined mode, determining that the scrambling identity is to be selected from the predefined set of scrambling identities.
  • the first communication device is further caused to determine whether the scrambling identity is to be selected by: in response to determining that the mode of the sidelink transmission is different from the predetermined mode, determining whether one or more scrambling identities are received in a first message from a third communication device; and in response to non-reception of the one or more scrambling identities, determining that the scrambling identity is to be selected from the predefined set of scrambling identities.
  • the first communication device is further caused to: in response to reception of the one or more scrambling identities in the first message from the third communication device, determine the scrambling identity from the one or more scrambling identities.
  • the one or more scrambling identities comprise a plurality of scrambling identities
  • the first communication device is caused to determine the scrambling identity by: receiving an indication of the scrambling identity in a second message from the third communication device; and determining the scrambling identity from the plurality of scrambling identities based on the received indication.
  • the first communication device is located in a communication area covered by the third communication device, the first message comprises common signaling in at least the communication area, and the second message comprises signaling specific to the first communication device.
  • the indication of the scrambling identity is received before generating the sidelink control information, and the first communication device is caused to generate the sidelink control information by generating the sidelink control information including the indication of the scrambling identity, and the first communication device is further caused to send the sidelink control information to the second communication device.
  • a third communication device comprises: at least one processor; and at least one 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 third communication device to: select from a predefined set of scrambling identities, one or more scrambling identities for generating a demodulation reference signal sequence for sidelink transmission in a communication area; and broadcast the one or more scrambling identities via a first message in the communication area.
  • the one or more scrambling identities comprise a plurality of scrambling identities
  • the third communication device is further caused to: allocate a scrambling identity of the plurality of scrambling identities to a first communication device in the communication area; and send an indication of the scrambling identity to the first communication device in a second message.
  • the third communication device is further caused to: schedule a fourth communication device to share a time and frequency resource with the first communication device; allocate the scrambling identity to the fourth communication device; allocate a first set of antenna ports to the first communication device and a second set of antenna ports to the fourth communication device, the first set of antenna ports being orthogonal to the second set of antenna ports; send an indication of and the first set of antenna ports to the first communication device in the second message.
  • the first communication device is located in a communication area covered by the third communication device, the first message comprises common signaling in at least the communication area, and the second message comprises signaling specific to the first communication device.
  • a method comprises: generating, by a first communication device, sidelink control information associated with sidelink transmission to a second communication device; selecting a scrambling identity from a predefined set of scrambling identities based on the sidelink control information adjusted by randomly setting one or more values for one or more of a plurality of bits included in the sidelink control information; generating, based on the scrambling identity, a demodulation reference signal sequence for the sidelink transmission; and performing the sidelink transmission to the second communication device based on the demodulation reference signal sequence.
  • the plurality of bits comprise a plurality of reserved bits
  • selecting the scrambling identity from the predefined set of scrambling identities comprises: randomly setting one or more of the plurality of reserved bits as zero and others of the plurality of reserved bits as one, to adjust the sidelink control information; and selecting the scrambling identity from the predefined set of scrambling identities based on the adjusted sidelink control information.
  • randomly setting the one or more of the plurality of reserved bits as zero and the others of the plurality of reserved bits as one comprises: for each of the plurality of reserved bits, determining, with a predetermined probability, whether the reserved bit is to be set as zero or one; and setting the reserved bit as zero or one based on the determining.
  • selecting the scrambling identity from the predefined set of scrambling identities comprises: generating a plurality of cyclic redundancy check bits based on the adjusted sidelink control information; mapping at least a part of the plurality of cyclic redundancy check bits into an index of a scrambling identity; and selecting, from the predefined set of scrambling identities, a scrambling identity associated with the mapped index as the scrambling identity.
  • generating the demodulation reference signal sequence based on the scrambling identity comprises: initializing, based on the scrambling identity, a sequence generator for generating the demodulation reference signal sequence; generating a pseudo-random binary sequence using the initialized sequence generator; and generating the demodulation reference signal sequence using the generated pseudo-random binary sequence.
  • selecting the scrambling identity from the predefined set of scrambling identities comprises: determining whether the scrambling identity is to be selected from the predefined set of scrambling identities; and in response to determining that the scrambling identity is to be selected, selecting the scrambling identity from the predefined set of scrambling identities.
  • determining whether the scrambling identity is to be selected comprises: determining whether a mode of the sidelink transmission is a predetermined mode; and in response to determining that the mode of the sidelink transmission is the predetermined mode, determining that the scrambling identity is to be selected from the predefined set of scrambling identities.
  • determining whether the scrambling identity is to be selected further comprises: in response to determining that the mode of the sidelink transmission is different from the predetermined mode, determining whether one or more scrambling identities are received in a first message from a third communication device; and in response to non-reception of the one or more scrambling identities, determining that the scrambling identity is to be selected from the predefined set of scrambling identities.
  • the method further comprises: in response to reception of the one or more scrambling identities in the first message from the third communication device, determining the scrambling identity from the one or more scrambling identities.
  • the one or more scrambling identities comprise a plurality of scrambling identities
  • determining the scrambling identity comprises: receiving an indication of the scrambling identity in a second message from the third communication device; and determining the scrambling identity from the plurality of scrambling identities based on the received indication.
  • the first communication device is located in a communication area covered by the third communication device, the first message comprises common signaling in at least the communication area, and the second message comprises signaling specific to the first communication device.
  • the indication of the scrambling identity is received before generating the sidelink control information
  • generating the sidelink control information comprises: generating the sidelink control information including the indication of the scrambling identity, and the method further comprises sending the sidelink control information to the second communication device.
  • a method comprises: selecting, by a third communication device, from a predefined set of scrambling identities, one or more scrambling identities for generating a demodulation reference signal sequence for sidelink transmission in a communication area; and broadcasting the one or more scrambling identities via a first message in the communication area.
  • the one or more scrambling identities comprise a plurality of scrambling identities
  • the method further comprises: allocating a scrambling identity of the plurality of scrambling identities to a first communication device in the communication area; and sending an indication of the scrambling identity to the first communication device in a second message.
  • the method further comprises: scheduling a fourth communication device to share a time and frequency resource with the first communication device; allocating the scrambling identity to the fourth communication device; allocating a first set of antenna ports to the first communication device and a second set of antenna ports to the fourth communication device, the first set of antenna ports being orthogonal to the second set of antenna ports; and sending an indication of and the first set of antenna ports to the first communication device in the second message.
  • the first communication device is located in a communication area covered by the third communication device, the first message comprises common signaling in at least the communication area, and the second message comprises signaling specific to the first communication device.
  • an apparatus comprises: means for generating, by a first communication device, sidelink control information associated with sidelink transmission to a second communication device; means for selecting a scrambling identity from a predefined set of scrambling identities based on the sidelink control information adjusted by randomly setting one or more values for one or more of a plurality of bits included in the sidelink control information; means for generating, based on the scrambling identity, a demodulation reference signal sequence for the sidelink transmission; and means for performing the sidelink transmission to the second communication device based on the demodulation reference signal sequence.
  • the plurality of bits comprise a plurality of reserved bits
  • the means for selecting the scrambling identity from the predefined set of scrambling identities comprises: means for randomly setting one or more of the plurality of reserved bits as zero and others of the plurality of reserved bits as one, to adjust the sidelink control information; and means for selecting the scrambling identity from the predefined set of scrambling identities based on the adjusted sidelink control information.
  • the means for randomly setting the one or more of the plurality of reserved bits as zero and the others of the plurality of reserved bits as one comprises: means for each of the plurality of reserved bits, determining, with a predetermined probability, whether the reserved bit is to be set as zero or one; and means for setting the reserved bit as zero or one based on the determining.
  • the means for selecting the scrambling identity from the predefined set of scrambling identities comprises: means for generating a plurality of cyclic redundancy check bits based on the adjusted sidelink control information; means for mapping at least a part of the plurality of cyclic redundancy check bits into an index of a scrambling identity; and means for selecting, from the predefined set of scrambling identities, a scrambling identity associated with the mapped index as the scrambling identity.
  • the means for generating the demodulation reference signal sequence based on the scrambling identity comprises: means for initializing, based on the scrambling identity, a sequence generator for generating the demodulation reference signal sequence; means for generating a pseudo-random binary sequence using the initialized sequence generator; and means for generating the demodulation reference signal sequence using the generated pseudo-random binary sequence.
  • the means for selecting the scrambling identity from the predefined set of scrambling identities comprises: means for determining whether the scrambling identity is to be selected from the predefined set of scrambling identities; and means for in response to determining that the scrambling identity is to be selected, selecting the scrambling identity from the predefined set of scrambling identities.
  • the means for determining whether the scrambling identity is to be selected comprises: means for determining whether a mode of the sidelink transmission is a predetermined mode; and means for in response to determining that the mode of the sidelink transmission is the predetermined mode, determining that the scrambling identity is to be selected from the predefined set of scrambling identities.
  • the means for determining whether the scrambling identity is to be selected further comprises: means for in response to determining that the mode of the sidelink transmission is different from the predetermined mode, determining whether one or more scrambling identities are received in a first message from a third communication device; and means for in response to non-reception of the one or more scrambling identities, determining that the scrambling identity is to be selected from the predefined set of scrambling identities.
  • the apparatus further comprises: means for in response to reception of the one or more scrambling identities in the first message from the third communication device, determining the scrambling identity from the one or more scrambling identities.
  • the one or more scrambling identities comprise a plurality of scrambling identities
  • the means for determining the scrambling identity comprises: means for receiving an indication of the scrambling identity in a second message from the third communication device; and means for determining the scrambling identity from the plurality of scrambling identities based on the received indication.
  • the first communication device is located in a communication area covered by the third communication device, the first message comprises common signaling in at least the communication area, and the second message comprises signaling specific to the first communication device.
  • the indication of the scrambling identity is received before generating the sidelink control information
  • the means for generating the sidelink control information comprises: means for generating the sidelink control information including the indication of the scrambling identity
  • the apparatus further comprises means for sending the sidelink control information to the second communication device.
  • an apparatus comprises: means for selecting, by a third communication device, from a predefined set of scrambling identities, one or more scrambling identities for generating a demodulation reference signal sequence for sidelink transmission in a communication area; and means for broadcasting the one or more scrambling identities via a first message in the communication area.
  • the one or more scrambling identities comprise a plurality of scrambling identities
  • the apparatus further comprises: means for allocating a scrambling identity of the plurality of scrambling identities to a first communication device in the communication area; and means for sending an indication of the scrambling identity to the first communication device in a second message.
  • the apparatus further comprises: means for scheduling a fourth communication device to share a time and frequency resource with the first communication device; means for allocating the scrambling identity to the fourth communication device; means for allocating a first set of antenna ports to the first communication device and a second set of antenna ports to the fourth communication device, the first set of antenna ports being orthogonal to the second set of antenna ports; and means for sending an indication of and the first set of antenna ports to the first communication device in the second message.
  • the first communication device is located in a communication area covered by the third communication device, the first message comprises common signaling in at least the communication area, and the second message comprises signaling specific to the first communication device.
  • a computer readable storage medium comprises program instructions stored thereon, the instructions, when executed by a processor of a device, causing the device to perform the method according to some example embodiments of the present disclosure.

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Abstract

La présente invention concerne, selon des modes de réalisation donnés à titre d'exemple, des dispositifs, des procédés, des appareils et des supports d'informations lisibles par ordinateur de configuration de signal de référence de démodulation (DMRS) destinés à une transmission de liaison latérale (SL). Dans des modes de réalisation donnés à titre d'exemple, un premier dispositif de communication génère des informations de commande de liaison latérale (SCI) associées à une transmission de liaison latérale sur un second dispositif de communication. Le premier dispositif de communication sélectionne une identité de brouillage à partir d'un ensemble prédéfini d'identités de brouillage sur la base des SCI ajustées en définissant de manière aléatoire une ou plusieurs valeurs pour un ou plusieurs bits d'une pluralité de bits compris dans les SCI. Le premier dispositif de communication génère en outre, sur la base de l'identité de brouillage, une séquence DMRS destinée à la transmission SL, et effectue la transmission SL vers le second dispositif de communication sur la base de la séquence DMRS.
PCT/CN2019/089661 2019-05-31 2019-05-31 Configuration de signal de référence de démodulation pour transmission de liaison latérale WO2020237671A1 (fr)

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