WO2018201384A1 - Appareil et procédé de communications de liaison latérale - Google Patents

Appareil et procédé de communications de liaison latérale Download PDF

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Publication number
WO2018201384A1
WO2018201384A1 PCT/CN2017/083021 CN2017083021W WO2018201384A1 WO 2018201384 A1 WO2018201384 A1 WO 2018201384A1 CN 2017083021 W CN2017083021 W CN 2017083021W WO 2018201384 A1 WO2018201384 A1 WO 2018201384A1
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Prior art keywords
transmission time
resource
time interval
communication
communication resource
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PCT/CN2017/083021
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English (en)
Inventor
Jin Yang
Youxiong Lu
Lin Chen
Shuanghong Huang
Jie Chen
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Zte Corporation
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Priority to PCT/CN2017/083021 priority Critical patent/WO2018201384A1/fr
Publication of WO2018201384A1 publication Critical patent/WO2018201384A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • the disclosure relates generally to wireless communications and, more particularly, to systems and methods for transmitting sidelink control information (SCI) and associated data.
  • SCI sidelink control information
  • LTE D2D Device-to-Device
  • UEs user equipments
  • the communications may not require a base station (BS) .
  • BS base station
  • a transmission UE transmits desired/requested data to a receiving UE via a respective air interface directly.
  • a car network communication system is an example of the D2D communication system.
  • a vehicle uses respective devices such as, for example, sensors, vehicle terminals, and/or electronic tags, to transmit/receive respective vehicle information, which can realize various communication technologies, for example, Vehicle-to-Vehicle (V2V) , Vehicle-to-Person (V2P) , and Vehicle-to-Infrastructure (V2I) , generally referred to a “V2X” communications herein.
  • V2V Vehicle-to-Vehicle
  • V2P Vehicle-to-Person
  • V2I Vehicle-to-Infrastructure
  • real-time information exchange in V2X communications can provide various advantages such as, for example, providing advance notice of road conditions, collaboratively perceiving a road hazard situation, providing collision warning information in time to prevent the occurrence of traffic accidents, etc.
  • FIG. 1A illustrates a block diagram of a wireless V2X communication system 100 in which a first UE device 102 (e.g., contained in a first vehicle, or it may be mobile station, etc. ) can communicate with a second UE device 104 (e.g., contained in a second vehicle, or held by a person, or coupled to infrastructure) , in accordance with some embodiments.
  • a direct communication between two UEs is typically referred to as a “sidelink” (SL) communication.
  • SL sidelink
  • each of the UE’s 102 and 104 can further communicate with a base station (BS) 106 (e.g., an eNodeB, gNodeB, etc.
  • BS base station
  • each of the UE’s 102 and 104 and the BS 106 can be referred to as a “communication node. ”
  • a UE carries transmission information using a subframe as a unit.
  • Figure 2 illustrates one radio frame that includes ten subframes, each subframe being dividable into two slots, or 14 symbols (normal cyclic prefix (CP) ) , or 12 symbols (extended CP) , here, the symbol is a OFDM symbol or a SC-FDMA symbol.
  • the time transmission interval (TTI) used by a UE for SL communications is one subframe, such as the subframe shown in Figure 2.
  • a new (e.g. shorter) TTI is desirable for use in SL communications in the V2X system, and other similar systems.
  • exemplary embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings.
  • exemplary systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and not limitation, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of the invention.
  • a method for transmitting sidelink control information and data includes: transmitting a first sidelink control signal using a first communication resource having a first transmission time interval; and transmitting sidelink data using a second communication resource having a second transmission time interval, wherein the first sidelink control signal contains information about the second communication resource and at least one of the first and second transmission time intervals is a short transmission time interval.
  • the method further includes transmitting a second sidelink control signal using a third communication resource having a third transmission time interval, wherein the first transmission time interval is equal to a subframe in a time domain and the third transmission time interval is equal to the short transmission time interval.
  • a method for receiving sidelink control information and data includes: receiving a first sidelink control signal transmitted using a first communication resource having a first transmission time interval; and receiving sidelink data transmitted using a second communication resource having a second transmission time interval, wherein the first sidelink control signal contains information about the second communication resource and at least one of the first and second transmission time intervals is a short transmission time interval.
  • this method further includes receiving a second sidelink control signal using a third communication resource having a third transmission time interval, wherein the first transmission time interval is equal to a subframe in a time domain and the third transmission time interval is equal to the short transmission time interval.
  • a communication node includes: a transmitter configured to: transmit a sidelink control signal using a first communication resource having a first transmission time interval; and transmit sidelink data using a second communication resource having a second transmission time interval, wherein the sidelink control signal contains information about the second communication resource and at least one of the first and second transmission time intervals is a short transmission time interval.
  • a communication node includes: a receiver configured to: receive a first sidelink control signal transmitted using a first communication resource having a first transmission time interval; and receive sidelink data transmitted using a second communication resource having a second transmission time interval, wherein the first sidelink control signal contains information about the second communication resource and at least one of the first and second transmission time intervals is a short transmission time interval.
  • FIG. 1 illustrates an exemplary V2X communication environment in which one or more features of the invention can be implemented, in accordance with some embodiments of the invention.
  • FIG. 2 illustrates a radio frame architecture in which transmission information may be transmitted as one or more subframes, in accordance with some embodiments of the invention.
  • Figure 3 illustrates a block diagram of an exemplary UE device, in accordance with some embodiments of the invention.
  • Figure 4 illustrates two exemplary short TTI structures within a subframe, in accordance with some embodiments of the present disclosure.
  • FIGS 5A and 5B illustrate a V2X PSSCH resource pool and a PSCCH resource pool structure implemented with legacy subframes, respectively, in accordance with a first method (Method 1) of providing resource pools.
  • Figures 6A and 6B illustrate two ways of Sidelink data and control information transmission using a legacy subframe structure in accordance with Method 1 of providing resource pools, respectively.
  • Figure 7 illustrates another V2X PSCCH resource pool and a PSSCH resource pool structure with non-contiguous resource blocks, respectively, in accordance with a second method (Method 2) of providing resource pools.
  • Figure 8 illustrates an exemplary indication of short TTI resource allocation with a bitmap, in accordance with an embodiment of the invention.
  • Figure 9 illustrates an exemplary indication of short TTI resource allocation with short TTI index indicator, in accordance with another embodiment of the invention.
  • Figure 10 illustrates an exemplary resource scheme for Sidelink control and data transmission using short TTIs, in accordance with some embodiments of the invention.
  • Figure 11 illustrates another exemplary resource scheme for Sidelink control and data transmission using short TTIs, , in accordance with some embodiments of the invention.
  • Figure 12 illustrates yet another exemplary resource scheme for Sidelink control and data transmission using short TTI, in accordance with some embodiments of the invention.
  • Figure 13 illustrates yet another exemplary resource scheme for Sidelink control and data transmission using short TTIs, in accordance with some embodiments of the invention.
  • Figure 14 illustrates yet another exemplary resource scheme for Sidelink control and data transmission using short TTIs, in accordance with some embodiments of the invention.
  • Figure 15 illustrates yet another exemplary resource scheme for Sidelink control and data transmission using short TTIs, in accordance with some embodiments of the invention.
  • Figure 16 illustrates yet another exemplary resource scheme for Sidelink control and data transmission using short TTIs, in accordance with some embodiments of the invention.
  • Figure 17 illustrates yet another exemplary resource scheme for Sidelink control and data transmission using short TTIs, in accordance with some embodiments of the invention.
  • Figure 18 illustrates yet another exemplary resource scheme for Sidelink control and data transmission using short TTIs, in accordance with some embodiments of the invention.
  • Figure 19 illustrates an exemplary SCI transmission with two Type 2 Tx UEs using a common PSCCH resource, in accordance with some embodiments of the invention.
  • Figure 20 illustrates another exemplary SCI transmission with two Type 2 Tx UEs, in accordance with some embodiments of the invention.
  • FIG 3 illustrates a block diagram of a UE 300, in accordance with some embodiments.
  • the UE 300 may be the same as UE1 102 and/or UE2 104 of Figure 1. It is understood that the UE 300 is an example of a device that can be configured to implement the various methods described herein.
  • the UE 300 includes a housing 302 containing a system clock 304, a processor 306, a memory 308, a transceiver 310 comprising a transmitter 311 and receiver 312 each coupled to an antenna 314, a signal detector 316, and a power module 318.
  • the system clock 304 provides the timing signals to the processor 306 for controlling the timing of all operations of the UE 300.
  • the processor 306 controls the general operation of the UE 300 and can include one or more processing circuits or modules such as a central processing unit (CPU) and/or any combination of general-purpose microprocessors, microcontrollers, digital signal processors (DSPs) , field programmable gate array (FPGAs) , programmable logic devices (PLDs) , controllers, state machines, gated logic, discrete hardware components, dedicated hardware finite state machines, or any other suitable circuits, devices and/or structures that can perform calculations or other manipulations of data.
  • CPU central processing unit
  • DSPs digital signal processors
  • FPGAs field programmable gate array
  • PLDs programmable logic devices
  • the processor 306 also controls and executes a synchronization procedure to enable the UE 300 to become synchronized with one or more BS’s 104 (Fig. 1) and/or other UE’s, in accordance with various embodiments of the invention.
  • the memory 308 which can include both read-only memory (ROM) and random access memory (RAM) , can provide instructions and data to the processor 306. A portion of the memory 308 can also include non-volatile random access memory (NVRAM) .
  • the processor 306 typically performs logical and arithmetic operations based on program instructions stored within the memory 308. The instructions (a.k.a., software) stored in the memory 308 can be executed by the processor 306 to perform the methods described herein.
  • the processor 306 and memory 308 together form a processing system that stores and executes software.
  • “software” means any type of instructions, whether referred to as software, firmware, middleware, microcode, etc. which can configure a machine or device to perform one or more desired functions or processes. Instructions can include code (e.g., in source code format, binary code format, executable code format, or any other suitable format of code) .
  • the instructions when executed by the one or more processors, cause the processing system to perform the various functions described herein.
  • the transceiver 310 which includes the transmitter 311 and receiver 312, allows the UE 300 to transmit and receive data to and from a remote device (e.g, STA 304) .
  • An antenna 314 is typically attached to the housing 302 and electrically coupled to the transceiver 310.
  • the UE 300 include (not shown) multiple transmitters, multiple receivers, multiple transceivers, and/or multiple antennas.
  • the transmitter 311 can be configured to wirelessly transmit packets having different packet types or functions, such packets being generated by the processor 306.
  • the receiver 312 is configured to receive packets having different packet types or functions
  • the processor 306 is configured to process packets of a plurality of different packet types. For example, the processor 306 can be configured to determine the type of packet and to process the packet and/or fields of the packet accordingly.
  • the UE 300 can also include the signal detector 316, which can be used to detect and quantify the level of signals received by the transceiver 310.
  • the signal detector 316 can detect and quantify such parameters as total energy, energy per subcarrier per symbol, power spectral density and other signals.
  • the power module 318 can include a power source such as one or more batteries, and a power regulator, to provide regulated power to each of the above-described modules 304, 306, 308, 310, 316 and 318.
  • the power module 318 can include a transformer and a power regulator.
  • the various modules discussed above are coupled together by a bus system 320.
  • the bus system 320 can include a data bus and, for example, a power bus, a control signal bus, and/or a status signal bus in addition to the data bus. It is understood that the modules of the UE 300 can be operatively coupled to one another using any suitable techniques and mediums.
  • processor 306 can implement not only the functionality described above with respect to the processor 306, but also implement the functionality described above with respect to the signal detector 316.
  • each of the modules illustrated in Figure 3 can be implemented using a plurality of separate components or elements.
  • FIG. 4 illustrates two exemplary short TTI structures within a subframe 402 and 404 that may be utilized by a UE when a short TTI (hereinafter “sTTI” ) is used.
  • the sTTI structure 402 includes six sTTI units (#0 to #5) , wherein each sTTI unit can include either 2 or 3 symbols (e.g., OFDM symbols, SC-FDMA symbols, etc. ) .
  • the subframe includes two sTTI units (#0 and #1) , wherein each sTTI unit can include 7 symbols (e.g., OFDM symbols, SC-FDMA symbols, etc. ) .
  • sTTI structures that are shorter in the time domain enable faster allocation of resources.
  • SL communications have not adopted the above-mentioned sTTI structures.
  • a transmitting (TX) UE sends sidelink control information (SCI) on a Physical Sidelink Control Channel (PSCCH) and respective SL data on a corresponding Physical Sidelink Shared Channel (PSSCH) .
  • SCI is control information that has information about how many sub-channels and which sub-channels can be used by a UE to transmit data.
  • a resource pool including plural resource blocks (RBs) to be used by the PSCCH and PSSCH, respectively, is typically utilized in SL communications of legacy V2X systems.
  • a subframe in the time domain, a subframe is used as a unit.
  • a sub-channel is used as a unit, wherein each sub-channel includes a contiguous and fixed number of RBs.
  • a V2X resource pool can include plural subframes and sub-channels in the time and frequency domains, respectively.
  • a sub-channel and a subframe are respectively used as units in the frequency domain and the time domain, respectively, to constitute either a PSCCH resource or a PSSCH resource, which will be discussed in further detail below.
  • Method 1 There are two methods (referred to herein as “Method 1” and “Method 2” ) to allocate the SL resources, which will be described in further detail below with respect to Figures 5A-20.
  • Method 1 and Method 2 can be distinguished by whether the RBs used by the PSCCH (to transmit SCI) and PSSCH (to transmit data) , respectively, are contiguous or non-contiguous.
  • FIGS 5A and 5B illustrate exemplary V2X PSSCH and PSCCH resource pool structures within a subframe 502 and 508, respectively, when Method 1 is used. For purposes of clarity of illustration, only one subframe 502 (in the time domain) is shown.
  • the RBs of the V2X resource pool can be divided into plural sub-channels 504 (e.g., six sub-channels are shown in Figure 5A) , wherein each sub-channel contains a plurality of RBs (not shown) .
  • each of the sub-channels 504 has a common size (i.e., bandwidth) , which can be 5 RBs, 10 RBs, or 15 RBs, for example, in the frequency domain.
  • each sub-channel 504 spans 5 RBs in the frequency domain, each sub-channel extends over 60 (12 x 5) subcarriers, since each RB includes 12 subcarriers in the frequency domain.
  • the number of RBs (5, 10, or 15) of each sub-channel is pre-determined to define the width of each sub-channel.
  • the RBs having the two lowest RB indexes in each sub-channel 504, indicated by the regions with dashed lines 506, are used to transmit the SCI through the PSCCH, and the rest of RBs in each respective sub-channel (indicated as 508) are used to transmit the SL data through the PSSCH.
  • the RBs used to transmit the SCI via the PSCCH 506 are collectively referred to as the “PSCCH resource pool; ” and the RBs used to transmit the SL data via PSSCH 508 are collectively referred to as the “PSSCH resource pool.
  • the PSCCH resource pool may include plural PSCCH resources, wherein each PSCCH resource 506 includes two contiguous RBs.
  • the PSSCH resource pool may include plural PSSCH resources, wherein each PSSCH resource includes a plurality of RBs extending over a respective sub-channel.
  • Figures 6A and 6B illustrates two exemplary Sidelink data and control information transmission techniques when Method 1 is used for V2X resource pool configuration.
  • the remaining portion 604-2 of the sub-channel 604 and one or more adjacent sub-channels 606 with higher sub-channel index can be used to transmit data.
  • the remaining portion 604-2 of sub-channel 604 is used to transmit SL data.
  • the remaining portion 604-2 and plural adjacent sub-channels 606 are used to transmit SL data.
  • the two lowest contiguous RBs in the sub-channel 604 are used as a PSCCH resource, and remaining RBs in that particular sub-channel 604 are used as a corresponding PSSCH resource.
  • the two lowest contiguous RBs in the sub-channel 604 are used as a PSCCH resource, and the remaining RBs in that particular sub-channel 604 and RBs in one or more adjacent sub-channels 606 are used as a corresponding PSSCH resource.
  • FIG. 7 illustrates an exemplary schematic diagram of a V2X resource pool when Method 2 is used. It is noted that when Method 2 is used, respective RBs in the PSCCH resource pool 702 and the PSSCH resource pool 704 are non-contiguous, as shown in Figure 7. More specifically, the RBs in the PSCCH resource pool are used to transmit plural SCIs, and two contiguous RBs of the PSCCH resource pool 702 constitute a respective PSCCH resource.
  • each PSCCH resource may be used to transmit an SCI.
  • a corresponding PSSCH resource is associated to the PSCCH resource, wherein each PSSCH resource includes RBs extending over one or more respective sub-channels.
  • a plurality of RBs may constitute the respective PSSCH resource pool 704.
  • the RBs used to transmit the SCI and SL data are not contiguous.
  • a UE uses the legacy TTI (i.e., one subframe) as a unit in the time-domain to transmit information (e.g., SCI + data)
  • a UE uses the legacy TTI (i.e., one subframe) as a unit in the time-domain to transmit information (e.g., SCI + data)
  • a UE uses a sTTI as a unit in the time-domain to transmit information (e.g., SCI + data)
  • a UE is referred to as a “Type 2 Tx UE. ”
  • a Type 2 Tx UE can use a whole subframe (i.e., the above-mentioned PSCCH resources) to transmit the SCI while using one or more sTTIs to transmit the corresponding SL data.
  • the Type 2 Tx UE can transmit legacy SCI via the PSCCH.
  • This is particularly useful for a Type 1 Rx UE (areceiving Type 1 UE) since the Type 1 Rx UE uses only legacy TTI (i.e., one subframe) and, therefore, Type 1 Rx UE can decode the legacy SCI indicated by the Type 2 Tx UE, but cannot decode the data transmitted by the Type 2 Tx UE using sTTIs.
  • the Type 2 Tx UE may indicate which sTTIs can be used to transmit data in addition to the legacy SCI, using the legacy PSCCH resource (s) , in which one TTI equals one subframe. And then, the Type 1 Rx UE can decode the legacy SCI, but cannot obtain the additional information of the sTTIs used for data transmission. On the other hand, Type 2 Rx UE can decode the SCI with the additional indication, and obtain the information of which sTTIs are used for data, and thereafter decode corresponding SL data transmitted using sTTIs.
  • reserved bits in the legacy SCI format may be used to provide such indication. More specifically, 1 or “m” bits of the reserved bits are used to indicate which sTTIs can be used. Three approaches can be used by the Type 2 Tx UE for such an indication, which are described in Figure 8, Figure 9, and Table I, respectively.
  • Figure 8 illustrates the exemplary sTTI indication based on the subframe structure 402 of Figure 4, which includes six sTTIs: sTTI #0, sTTI #1, sTTI #2, sTTI #3, sTTI #4, and sTTI #5.
  • the Type 2 Tx UE uses 6 bits of the reserved bits corresponding to the 6 sTTIs in the subframe 402, and uses a corresponding “bitmap” to indicate which of these 6 sTTIs can be used for SL data.
  • sTTI #0 and sTTI #3 are indicated as available for use, so that the bitmap in the SCI may be represented as “100100” to indicate that sTTI #0 and #3 can be used to transmit data.
  • Figure 9 illustrates the exemplary sTTI indication based on the subframe structure 404 of Figure 4, which includes two slot for sTTIs: sTTI #0 and sTTI #1. Similar to Figure 8, the Type 2 Tx UE uses one bit of the reserved bits to correspond to respective indexes of the two slot sTTIs. For example, in Figure 9, when sTTI #1 can be used, the bit in the SCI corresponding to the index of sTTI #1 may be represented as “1” to indicate that sTTI #1 can be used to transmit data. When the sTTI #0 can be used, the value of the bit can be set to “0. ”
  • Table I provides another example of a technique to identify which sTTIs may be used for SL data when the subframe structure include 6 sTTIs, in accordance with some embodiments. More specifically, in this example, the Type 2 Tx UE uses 3 bits of the reserved bits in the SCI to correspond to a sTTI pattern index, wherein each sTTI pattern index corresponds to a particular “sTTI resource allocation” of those 6 sTTIs. That is, 8 pattern indexes are listed below in Table I, and each pattern index corresponds to a particular resource allocation of those 6 sTTIs. For example, for sTTI pattern index 0, the sTTI resource allocation is represented as “100000” , which indicates that only TTI #0 can be used to transmit data.
  • Figure 10 illustrates an exemplary resource scheme 1000 for Sidelink control and data transmission, wherein six sub-channels 1001 are utilized in the V2X band, each sub-channel 1001 having a number n subCHsize of RBs, in accordance one embodiment of the invention.
  • the Type 2 Tx UE can use the legacy PSCCH resource to transmit SCI, which indicates the sub-channel (s) used for data transmission. Furthermore, the Type 2 Tx UE may indicate which sTTIs can be used to transmit corresponding data in addition to SCI, as described above with reference to Figures 8 and 9. It is noted the exemplary schematic diagram of the V2X resource pool shown in Figure 10 is based on a Method 1 V2X resource pool, as discussed above with respect to Figures 5A-6B.
  • a PSSCH resource and a corresponding PSCCH resource be contiguous with each other in the frequency domain.
  • a PSCCH resource includes RBs with the two lowest RB indexes in a particular sub-channel, and corresponding PSSCH resource may include RBs that is substantially adjacent to the 2 lowest RBs in that particular channel.
  • a PSCCH resource 1002 and a short PSSCH (sPSSCH) resource 1004 can be contained in one sub-channel 1001.
  • corresponding data is transmitted using RBs that are contiguous to the 2 lowest RBs in that particular sub-channel (i.e., a respective PSSCH resource)
  • the corresponding data is transmitted using a sTTI (in the time domain) .
  • the information of which sTTIs used for data may be specified in the additional indication in SCI as described above, or may not be contained in legacy SCI.
  • the portion 1004 of the sub-channel containing the sTTI is referred to as the short PSSCH (sPSSCH) resource, and plural such sPSSCH resources may constitute a sPSSCH resource pool.
  • sPSSCH short PSSCH
  • data corresponding to each SCI may be transmitted using a respective sPSSCH resource, as described above.
  • several Type 2 Tx UEs may transmit plural SCIs in respective portions 1002 of sub-channels which constitute respective PSCCH resources, and the plural PSCCH resources constitute a PSCCH resource pool.
  • whether or not the Type 2 Tx UE transmits an SCI can be determined by pre-configuration, or instructed by base station 106 ( Figure 1) through Radio Resource Control (RRC) signals, a broadcast signal, and/or Downlink Control Information (DCI) signals.
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • whether or not to indicate the sTTIs which can be used for data transmission in addition to the SCI, as described above with respect to Figures 8-9 and Table I can also be determined by pre-configuration, or instructed by the base station 106 ( Figure 1) through respective RRC signals, a broadcast signal, and/or respective DCI signals.
  • the Type 2 Tx UE can transmit a new signal, referred to herein as a “short SCI (sSCI) , ” which includes the information of the legacy SCI (SCI format 1) , and further includes indicative information about the sTTI, as described above with respect to Figures 8-9 and Table I.
  • sSCI short SCI
  • Such an sSCI can be transmitted using a newly defined Sidelink control channel resource, referred to herein as a “short PSCCH (sPSCCH) , ” according to some embodiments.
  • sPSCCH Sidelink control channel resource
  • plural such sPSCCH resources may constitute a sPSCCH resource pool.
  • Figure 11 illustrates an exemplary schematic diagram of a resource pool scheme 1100 for Sidelink control and data transmission which uses six sub-channels 1102 in the V2X band, each sub-channel 1102 having a bandwidth of a number n subCHsize of RBs in accordance one embodiment of the invention.
  • the resource pool 1100 provides a V2X resource in accordance with Method 1 discussed above.
  • the Type 2 Tx UE uses a legacy PSCCH resource to transmit an SCI, and uses a respective sPSCCH resource to transmit an sSCI.
  • the Type 2 Tx UE can use one of the slots (e.g., slot #0 which corresponds to sTTI #0) in time domain and one or more sub-channels in the frequency domain to transmit data via a sPSSCH resource 1104.
  • the sPSSH resource 1104 spans one slot in the time domain and a plurality of sub-channels in the frequency domain.
  • the Type 2 Tx UE may use one legacy PSCCH resource 1106 to transmit legacy SCI. In some embodiments, this legacy PSCCH resource 1106 is formed by two contiguous RBs having the 2 lowest RB indexes in a particular sub-channel.
  • an SCI when plural sub-channels are used by a Type 2 Tx UE, an SCI may be transmitted using the PSCCH resource in the sub-channel having the lowest sub-channel index among the plural sub-channels.
  • an sSCI may be transmitted using a “k” number of contiguous RBs that follows the RBs with the two lowest RB indexes (i.e., the RBs being used to provide the PSCCH resource) within that particular sub-channel.
  • Such a k number of contiguous RBs may be referred as a respective sPSCCH resource in the frequency domain, and in the time domain, the sPSCCH resource includes the sTTI used for data transmission, e.g., sTTI #0.
  • the sSCI is transmitted using the RBs of the sPSCCH resource 1108, and the remaining RBs within that particular sub-channel, or the remaining RBs within that particular sub-channel plus the RBs of one or more adjacent sub-channels, which constitute a respective sPSSCH resource, can be used to transmit data, as shown in Figure 11.
  • Figure 12 illustrates an exemplary resource pool scheme 1200 for Sidelink control and data transmission, which is substantially similar to the resource pool 1100 of Figure 11 except that, in Figure 12, the Type 2 Tx UE does not transmit the legacy SCI and therefore does not use a legacy PSCCH resource 1106 (Fig. 11) .
  • the Type 2 Tx UE uses a sub-channel having the lowest sub-channel index among plural sub-channels to transmit the sSCI, and at least part of corresponding data.
  • a “k” number of contiguous RBs that start at the lowest RB index within that particular sub-channel will be used as a respective sPSCCH resource 1208, and in the time domain, such a sPSCCH resource 1208 includes the sTTI used for data trasnsmission (e.g., sTTI #0, which corresponds to slot #0) to transmit the sSCI.
  • the sSCI is transmitted using the RBs of the sPSCCH resource 1208, and the remaining RBs within that particular sub-channel, or the remaining RBs within that particular sub-channel plus the RBs of one or more adjacent sub-channels, which constitute a respective sPSSCH resource 1204, can be used to transmit data.
  • Figure 13 illustrates an exemplary resource pool scheme 1300 for Sidelink control and data transmission that provides a V2X resource pool based on Method 2, as discussed above.
  • legacy SCI is transmitted on a legacy PSCCH resource 1302 contained in PSCCH resource pool 1304.
  • the exemplary resource pool scheme 1300 further provides a sPSSCH resource 1306 for transmitting sSCI. More specifically, a “k” number of contiguous RBs that starts at the lowest RB index within a particular sub-channel can be used as a respective sPSCCH resource to transmit the sSCI. The remaining RBs within that particular sub-channel, which constitute a respective sPSSCH resource, or the remaining RBs within that particular sub-channel plus RBs within one or more adjacent sub-channels, can be used to transmit data. The remaining RBs within that particular sub-channel that transmit data constitute a sPSSCH resource 1308, as shown in Figure 13. As further shown in Figure 13, the sPSCCH 1306 and sPSSCH 1308 span one slot (e.g., slot #1 corresponding to sTTI #1) in the time domain, in accordance with some embodiments.
  • a sPSSCH resource 1306 for transmitting sSCI. More specifically, a “k” number of contiguous RBs that
  • Figure 14 illustrates an exemplary resource pool scheme 1400 which is similar to the resource pool scheme 1300 of Figure 13, except that the Type 2 Tx UE does not transmit SCI and therefore does not use the PSCCH resource 1302 (Fig. 13) to transmit a legacy SCI. Instead, in accordance with some embodiments, the Type 2 Tx UE uses RBs of one sub-channel among a plurality of sub-channels in the frequency domain as respective sPSCCH resource 1402. In some embodiments, this particular sub-channel may have a lowest sub-channel index among a plurality of sub-channels used by Type 2 Tx UE.
  • the sPSCCH resource extends over “t” symbols in the time domain and spans the entire sub-channel in the frequency domain to transmit a respective sSCI. It is noted the time duration of the first t symbols is shorter than one slot sTTI in the time domain, as discussed above with respect to Figure 4. In some embodiments, such “t” may be pre-configured or determined by the base station 106 ( Figure 1) . The remaining symbols in the sTTI of the particular sub-channel with the lowest sub-channel index, or the remaining symbols within that particular sub-channel plus the RBs of one or more adjacent sub-channels, which constitute a respective sPSSCH resource 1404, can be used to transmit data.
  • Figure 15 illustrates an exemplary resource pool scheme 1500 when the Type 2 Tx UE uses a portion of a PSCCH resource 1502 as an sPSCCH resource 1504 to transmit an sSCI. It is noted that the V2X resource pool of Figure 15 is based on Method 1 as discussed above. That is, the RBs having the lowest 2 RB indexes in each sub-channel are used as a respective PSCCH resource 1502. In some embodiments, plural sub-channels may be used by the Type 2 Tx UE as respective sPSSCH resources.
  • the Type 2 Tx UE may use the RBs with the lowest 2 RB indexes in that sub-channel with the lowest sub-channel index as the respective sPSCCH resource in the frequency domain to transmit the sSCI.
  • a sPSCCH resource includes the symbols of a sTTI (e.g., sTTI #0, which is slot #0) .
  • the remaining RBs in the same slot within the particular sub-channel and more adjacent sub-channels provide a sPSSCH resource 1506, as shown in Figure 15.
  • Figure 16 illustrates an exemplary resource pool scheme 1600 similar to the resource pool scheme 1500 of Figure 15, except that the Type 2 Tx UE uses a portion of a PSCCH resource 1602 as an sPSCCH resource 1604 to transmit an sSCI based on resource pool configuration Method 2.
  • plural sub-channels may be used by the Type 2 Tx UE as respective sPSSCH resource (s) 1606 to transmit corresponding data.
  • a sub-channel with a lowest sub-channel index, which corresponds to a respective PSCCH resource may be used by the Type 2 Tx UE to transmit the sSCI.
  • the PSCCH resource 1602 includes two contiguous RBs in the frequency domain, and these two contiguous RBs can be used by the Type 2 Tx UE to transmit the respective sSCI.
  • the sPSCCH resource 1604 includes the symbols of one slot sTTI (e.g., sTTI #0 corresponding to slot #0) .
  • Figure 17 illustrates an exemplary resource pool scheme 1700 similar to the resource scheme 1600 of Figure 16 except that the Type 2 Tx UE uses the RBs of two PSCCH resources 1702 in the frequency domain as a sPSCCH resource 1704 to transmit sSCI based on resource pool configuration Method 2.
  • plural sub-channels may be used by the Type 2 Tx UE as respective sPSSCH resource (s) 1706 to transmit data.
  • the sPSSCH resources 1706 includes symbols of sTTI #1 (i.e., slot #1) .
  • a sub-channel with a lowest sub-channel index among the plural sub-channels, which corresponds to a respective PSCCH resource may be used by the Type 2 Tx UE to transmit the sSCI.
  • the Type 2 Tx UE uses two contiguous RBs from respective PSCCH resource, and two other contiguous RBs of an adjacent PSCCH resource in frequency domain to transmit the sSCI.
  • the sPSCCH resource includes the symbols of sTTI #1 (i.e., slot #1) .
  • Figure 18 illustrates an exemplary resource pool scheme 1800 having a dedicated sPSCCH resource pool 1802.
  • a dedicated sPSCCH resource pool 1802 when the dedicated sPSCCH resource pool 1802 is provided, a one-to-one corresponding relationship of a sPSCCH resource and a sPSSCH resource is provided, and the plural sPSSCH resources constitute a sPSSCH resource pool 1804 . More specifically, in the time domain, both the sPSCCH resource pool 1802 and the sPSSCH resource pool 1804 share a common sTTI.
  • both sPSCCH and sPSSCH resource pools use a common slot sTTI, i.e., each sPSSCH resource has a respective slot at a particular sub-channel, and a corresponding sPSCCH resource also has a respective slot.
  • each of the sPSCCH resources has a “k” number of contiguous RBs, wherein the k may be pre-configured or determined by the base station 106 ( Figure 1) .
  • the Type 2 Tx UE when the Type 2 Tx UE uses a respective sPSCCH resource (e.g., “1” in sPSCCH resource pool of Figure 18) to transmit an sSCI, the Type 2 Tx UE may use a corresponding sPSSCH resource (e.g., “1” in sPSSCH resource pool of Figure 18) to transmit data.
  • a respective sPSCCH resource e.g., “1” in sPSCCH resource pool of Figure 18
  • a corresponding sPSSCH resource e.g., “1” in sPSSCH resource pool of Figure 18
  • FIG. 19 illustrates an exemplary schematic diagram of a SCI transmission conflict condition 1900 when two Type 2 Tx UEs use a common subframe but respective different sTTIs (e.g., slot sTTI) to transmit data.
  • a Type 2 Tx UE1 uses RBs over slot #0 (in time domain) and over a first plurality of sub-channels (in frequency domain) to provide a first sPSSCH resource 1902 for UE1 to transmit data.
  • a second Type 2 Tx UE2 uses RBs over slot #1 (in time domain) and over a second plurality of sub-channels (in frequency domain) to provide a second sPSSCH resource 1904 to transmit data.
  • UE1’s and UE2’s sPSSCH resources start at a common sub-channel
  • UE1’s and UE2’s respective SCIs may be transmitted on a common PSCCH resource 1906.
  • this may cause some conflict such as different SCIs of UE1 and UE2 may be transmitted on the same PSCCH resource, and the overlapping signals cannot be decoded correctly by the receiving UEs.
  • Type 2 Tx UEs may be used by such plural Type 2 Tx UEs to transmit SCI to assure that the transmitted SCI can be accurately decoded by a receiving UE.
  • Which of these two approaches will be used may be in accordance with a pre-configured principle, or determined by the BS 106 ( Figure 1) .
  • a unified SCI is used and transmitted by the plural Type 2 Tx UEs.
  • the content of such a unified SCI may be determined by the BS 106 based on the actual SCIs of the plural Tx UEs or resource allocation of Sidelink or the measurement of Sidelink resource pool, etc., in accordance with some embodiments. More specifically, the content of the unified SCI may include: priority information, resource reservation information, frequency resource location, modulation and coding scheme (MCS) , Time gap between initial transmission and retransmission, retransmission index, etc.
  • MCS modulation and coding scheme
  • the BS 106 may use Radio Resource Control (RRC) or broadcast signals to inform the plural Type 2 Tx UEs the content of the unified SCI.
  • RRC Radio Resource Control
  • the content of the unified SCI may be pre-configured in a protocol.
  • the BS 106 may use RRC or broadcast signals to inform the plural Type 2 Tx UEs to use the pre-configured content of the unified SCI.
  • only one of the plural Type 2 Tx UEs is enabled to transmit the SCI on the particular PSCCH resource, and the other Tx UE should not transmit SCI.
  • Which Tx UE can transmit SCI may be determined by a pre-configured rule or a BS 106. Since only one Tx UE transmits SCI on the particular PSCCH resource, it can avoid the confusion of plural SCIs transmission on the same PSCCH resource.
  • Figure 20 illustrates an exemplary SCI transmission scheme 2000 which is similar to the scheme 1900 of Figure 19 except that the V2X resource pool is based on resource pool configuration Method 2.
  • the RBs in the PSCCH resource 2002 used for transmitting SCI are non-contiguous with the RBs used in the corresponding respective sPSSCH resources 2004 and 2006 for UE1 and UE2, respectively.
  • a scenario may cause some issues.
  • only one or more of the plural Type 2 Tx UEs are enabled to transmit the SCI depending on whether the Type 2 Tx UE’s respective sPSSCH resources extend over a pre-configured number (e.g., 4) of sub-channels.
  • a sPSSCH resource 2004 for UE 1 spans only two sub-channels
  • the sPSSCH resource 2006 for UE2 spans four sub-channels.
  • only UE 2 which spans four sub-channels in the frequency domain may be enabled to transmit SCI on the PSCCH 2002.
  • short refers to a transmission time interval that is less than the length of a subframe in the time domain.
  • any reference to an element herein using a designation such as “first, “ “second, “ and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
  • any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software” or a "software module) , or any combination of these techniques.
  • a processor, device, component, circuit, structure, machine, module, etc. can be configured to perform one or more of the functions described herein.
  • IC integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the logical blocks, modules, and circuits can further include antennas and/or transceivers to communicate with various components within the network or within the device.
  • a general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine.
  • a processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
  • Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another.
  • a storage media can be any available media that can be accessed by a computer.
  • such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • module refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the invention.
  • memory or other storage may be employed in embodiments of the invention.
  • memory or other storage may be employed in embodiments of the invention.
  • any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the invention.
  • functionality illustrated to be performed by separate processing logic elements, or controllers may be performed by the same processing logic element, or controller.
  • references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.

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

Abstract

L'invention concerne des dispositifs et des procédés de communications de liaison latérale. Dans un mode de réalisation, le procédé consiste à : transmettre un signal de commande de liaison latérale grâce à une première ressource de communication ayant un premier intervalle de temps de transmission; et transmettre des données de liaison latérale grâce à une deuxième ressource de communication ayant un deuxième intervalle de temps de transmission, le signal de commande de liaison latérale contenant des informations concernant la deuxième ressource de communication et au moins un des premier et deuxième intervalles de temps de transmission étant un intervalle de temps de transmission court.
PCT/CN2017/083021 2017-05-04 2017-05-04 Appareil et procédé de communications de liaison latérale WO2018201384A1 (fr)

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WO2021056565A1 (fr) * 2019-09-29 2021-04-01 华为技术有限公司 Procédé de transmission d'informations de commande de liaison latérale et appareil de communication
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