WO2015042889A1 - Procédé et dispositif de réservation de temps de commutation en communication de dispositif à dispositif - Google Patents

Procédé et dispositif de réservation de temps de commutation en communication de dispositif à dispositif Download PDF

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Publication number
WO2015042889A1
WO2015042889A1 PCT/CN2013/084506 CN2013084506W WO2015042889A1 WO 2015042889 A1 WO2015042889 A1 WO 2015042889A1 CN 2013084506 W CN2013084506 W CN 2013084506W WO 2015042889 A1 WO2015042889 A1 WO 2015042889A1
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Prior art keywords
symbol
data frame
switching
vector
communication
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PCT/CN2013/084506
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English (en)
Chinese (zh)
Inventor
李栋
徐艳丽
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上海贝尔股份有限公司
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Priority to PCT/CN2013/084506 priority Critical patent/WO2015042889A1/fr
Priority to CN201380079434.9A priority patent/CN105519226B/zh
Publication of WO2015042889A1 publication Critical patent/WO2015042889A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections

Definitions

  • Exemplary and non-limiting embodiments of the present invention relate generally to wireless communications, and more particularly to methods and apparatus for reserving handover time in device-to-device (D2D) communications.
  • D2D device-to-device
  • D2D device-to-device
  • 3GPP 3rd Generation Partnership Project
  • Inter-device communication techniques may use the radio resources of the primary cellular system, but allow two computing devices, such as mobile terminals (also referred to as user equipment UEs), to communicate directly with one another without having to communicate their communications via components of the cellular network.
  • mobile terminals also referred to as user equipment UEs
  • a direct communication link between mobile terminals performing D2D communication can reduce end-to-end delay time of data exchange between terminals as compared with indirect communication via a cellular system component.
  • the network load is reduced.
  • Other benefits of D2D communication include improved coverage of the area, improved service network resources, and reduced transmission power of user equipment and network access points.
  • D2D communication can support a variety of end-user services, such as end-to-end applications, human-to-human game applications, collaborative applications, and similar applications that can be used by mobile end users that are close to each other.
  • interference may come from the following aspects: D2D communication uses the same resources as cellular communication, thereby causing interference between the D2D device and the cellular communication device, and different D2D devices are used. The same resources thus cause interference between D2D devices, and interference within the D2D device due to collisions between transmission and reception times due to possible timing problems in D2D communication. It should be noted that the third interference factor also causes the first two types of interference. For example, the base station can control the allocation of orthogonal time-frequency resources for D2D and cellular users, but it may still result from different timings of D2D devices and cellular users. Resource conflicts cause interference problems.
  • a disadvantage of this approach is that a stiff puncturing operation will result in interference to the useful data carrier, including self-interference between the same user data carrier and mutual interference between different sub-bands used by different users. This is because the puncturing operation destroys the orthogonality of the multi-carrier signal.
  • one of the objects of embodiments of the present invention is to propose a handover time construction method that achieves reservation of handover time at a very low frequency efficiency and implementation complexity.
  • a method for reserving handover time in device-to-device (D2D) communication including:
  • DFT discrete Fourier transform
  • IDFT inverse discrete Fourier transform
  • the length of the precoded symbol vector is half of the number of allocated subcarriers; and wherein the precoded symbol vector is mapped only to even subcarriers.
  • a length-expanded cyclic prefix (CP) is employed in the partial symbol structure, and the length extension is obtained using at least partially redundant repetitive symbol sampling.
  • a method for performing a transmission/reception state switching in device-to-device (D2D) communication including:
  • determining whether to switch transmission/reception in a data frame The state includes: when the data frame is different from the transmission/reception state of the previous data frame or the subsequent data frame, it is determined that the handover is required.
  • determining the switching symbol position includes determining the symbol position as the data when the data frame is different from a previous data frame transmission/reception state and not switching at a previous data frame end The start symbol of the frame.
  • determining the switching symbol position includes determining the symbol position as the data when the data frame is different from a subsequent data frame transmission/reception state and not switching at a beginning of a subsequent data frame The symbol at the end of the frame.
  • determining the switching symbol position may further include determining that the symbol position is the data frame when the data frame is different from the before/after data frame transmission/reception state and the data frame is not switched before and after. The end of the symbol and the start symbol.
  • an apparatus for reserving a handover time in device-to-device (D2D) communication includes:
  • a precoding unit configured to perform discrete Fourier transform (DFT) precoding on constellation symbols of user data to obtain a precoded symbol vector
  • mapping unit configured to map the precoded symbol vector to a portion of the equally spaced subcarriers, leaving the other allocated subcarriers unused;
  • a transform unit configured to transform the mapped symbol vector into a time domain by an inverse discrete Fourier transform (IDFT) such that the generated time domain symbol vector exhibits a repeated structure;
  • IDFT inverse discrete Fourier transform
  • a removing unit configured to remove at least a portion of the redundantly repeated symbol samples from the time domain symbol vector having a repeating structure to obtain a partial symbol structure, wherein the idle time obtained by at least partially removing the symbol samples is obtained Reserved for switching time.
  • the length of the precoded symbol vector in the precoding unit is half of the number of allocated subcarriers; and wherein the precoded symbol vector is mapped only to even subcarriers.
  • an apparatus for performing a transmission/reception state switching in device-to-device (D2D) communication includes:
  • a first determining unit configured to determine whether to switch a transmit/receive state in the data frame
  • a second determining unit configured to determine a switching symbol position in the data frame determined to be switched
  • a processing unit configured to transmit/receive a partial symbol structure within the determined switching symbol and to perform switching of a transmission/reception state by using a switching time reserved in the partial symbol structure, wherein the partial symbol structure is according to the present invention
  • the first determining unit is further configured to determine that a handover is required when the data frame is different from a transmission/reception state of a previous data frame or a subsequent data frame.
  • the second determining unit is further configured to determine the symbol when the data frame is different from the previous data frame transmission/reception state and is not switched at the end of the previous data frame.
  • the location is the start symbol of the data frame.
  • the second determining unit is further configured to determine the symbol when the data frame is different from the next data frame transmission/reception state and is not switched at the beginning of the next data frame.
  • the position is the symbol at the end of the data frame.
  • the second determining unit may be further configured to determine that the data frame is different from the previous and succeeding data frame transmission/reception states and that the symbol position is determined when the front and rear data frames are not switched. The end symbol and start symbol of the data frame.
  • FIG. 1 shows an example of a communication system for implementing device-to-device communication in accordance with some example embodiments
  • D2D device-to-device
  • Figure 3 is a schematic diagram of common symbols
  • Figure 3 (b) is a schematic diagram of a time domain symbol vector having a repeating structure obtained in the process of generating a partial symbol structure in accordance with an embodiment of the present invention
  • FIG. 3 shows a schematic diagram of a partial symbol structure in accordance with an embodiment of the present invention
  • Figure 4 is a diagram of a method for performing transmission/reception state switching in device-to-device (D2D) communication, in accordance with an embodiment of the present invention. Schematic flow chart;
  • Figure 5 is a diagram showing the location of a switching symbol in a data frame, in accordance with some embodiments of the present invention.
  • Figure 6 shows a device-to-device according to some exemplary embodiments of the present invention.
  • D2D A schematic block diagram of a device that reserves switching time in communication
  • FIG. 7 is a schematic block diagram of an apparatus for performing a transmit/receive state switch in device-to-device (D2D) communication, according to some exemplary embodiments of the present invention.
  • D2D device-to-device
  • Figure 8 is a block diagram of a user equipment
  • FIG. 9 is a schematic diagram showing system performance obtained in accordance with an embodiment of the present invention. detailed description
  • FIG. 1 illustrates a block diagram of an exemplary communication system 100 for implementing device-to-device communication in accordance with some example embodiments. It is to be understood that the illustrations of the system 100 and the other figures are provided as an example of an embodiment, and should not be construed as limiting the scope and spirit of the disclosure in any way. In this regard, while Figure 1 illustrates an example of a communication system configuration for implementing device-to-device communication, many other configurations may be utilized to implement embodiments of the present invention.
  • system 100 can include an access point 102 that can provide wireless access to network 106.
  • access point 102 can include a base station, a base transceiver station, a Node B, an evolved Node B (eNB), and/or the like.
  • Network 106 may include one or more wireless networks, one or more wired networks, or some combination thereof, and in some embodiments, may include the Internet to A small part.
  • network 106 may use one or more mobile access mechanisms, such as Long Term Evolution (LTE), LTE-Advanced (LTE-A), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), broadband Code Division Multiple Access (W-CDMA), CDMA2000, Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), and/or similar systems.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • W-CDMA broadband Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000
  • GSM Global System for Mobile Communications
  • GSM Global System for Mobile Communications
  • GPRS General Packet Radio Service
  • the wireless access point 102 can be configured to provide user equipment (UE) 104 with wireless access via the link 108 to the network 106.
  • the UE 104 may comprise any mobile communication device such as a mobile telephone, a portable digital assistant (PDA), a smart phone, a pager, a notebook computer, a portable gaming device, or any other numerous handheld or portable communication devices, computing devices, content generating devices , content consumer devices, or a combination thereof.
  • the wireless access point 102 can be further configured to support the establishment of D2D communication between two or more UEs 104. In this regard, the wireless access point 102 can be configured to allocate resources for D2D communication and D2D discovery, coordinate D2D link establishment, and/or perform other similar functions.
  • two UEs 104 that can participate in D2D communication with each other through the D2D link 110 are shown.
  • the two UEs 104 are shown by way of example and not limitation. In this regard, it will be appreciated that more than two UEs 104 may participate in D2D communication over one or more D2D links 110.
  • the access point Since the propagation delay of D2D communication is different from the propagation delay of the device to the access point, in some cases, the access point cannot accurately control the transmission/reception timing of the D2D device, which may cause a collision between transmission and reception, and Causes interference.
  • a method for providing a reserved switching time for status switching of transmission/reception is proposed according to an embodiment of the present invention.
  • D2D device-to-device
  • a discrete Fourier transform (DFT) precoding is performed on the constellation symbols of the user data in step 201 to obtain a precoded symbol vector, wherein the length of the precoding is less than the number of allocated subcarriers.
  • the precoded symbol vector is only mapped to a portion of the equally spaced subcarriers, and the other allocated subcarriers are left unused, that is, zero is transmitted. Thereby, the mapped symbol vector is obtained, the length of which is equal to the number of allocated subcarriers, wherein the symbol samples corresponding to the unused subcarriers are padded with zeros.
  • the mapped symbol vectors are transformed into the time domain by inverse discrete Fourier transform (IDFT) such that the generated time domain symbol vectors exhibit a repeating structure.
  • IDFT inverse discrete Fourier transform
  • step 204 at least a portion of the redundantly repeated symbol samples are removed from the time domain symbol vector having a repeating structure to obtain a partial symbol structure, wherein the idle time obtained by at least partially removing the symbol samples is reserved. Switch time.
  • the DFT length employed in step 201 may be half the length of the allocated subcarriers, and in this case, in step 202, the precoded symbol vector is mapped only to even subcarriers.
  • step 204 of the method may further comprise generating a length-expanded cyclic prefix (CP) for the partial symbol structure, and the length extension is sampling with one or more redundant repetition symbols acquired.
  • CP cyclic prefix
  • Figure 3 shows a schematic diagram of a partial symbol structure in accordance with some exemplary embodiments.
  • 3(a) is a schematic diagram of a general symbol structure used as a reference, which includes a CP portion and a data portion, which is hereinafter referred to as symbol eight.
  • Figure 3 (b) is a diagram showing a time domain symbol vector having a repeating structure obtained in the process of generating a partial symbol structure in accordance with an embodiment of the present invention.
  • Figure 3 (c-d) shows a schematic diagram of a partial symbol structure in accordance with an embodiment of the present invention.
  • Fig. 3(c-d) is obtained by further processing the symbol vector having a repeating structure in Fig. 3(b).
  • the symbol vector having the repeated structure shown in FIG. 3(b) may be shifted such that a switching time is left between the end of the symbol and the start position of the next symbol, that is, as shown in FIG.
  • the partial symbol structure shown in 3 (C) is hereinafter referred to as symbol C.
  • symbol C the switching time is at the end of the symbol, the shaded portion at the left end of Figure 3(c) indicates the repeated symbol sampling that was removed, and the unrepeated repeated symbol sample can be used as the CP for length extension.
  • the repeating junction shown in FIG. 3(b) can be The end of the constructed symbol vector is aligned with the start position of the next symbol, and the switching time is reserved at its starting position, which results in a partial symbol structure as shown in Fig. 3 (d), which is referred to as a symbol in the following. D.
  • the switching time is at the beginning of the symbol, where the shaded portion represents the repeated symbol samples removed to meet the length requirement of the switching time.
  • the unremoved repeated symbol samples can also be used as the length extended CP in the example of FIG. 3(d).
  • the length extended CP is employed in the example of Fig. 3, in other embodiments, the normal length CP may also be used in the partial symbol structure.
  • Another embodiment of the present invention provides a method of switching a transmission/reception state using the partial symbol structure.
  • 4 is a schematic flow chart showing a method for performing transmission/reception state switching in device-to-device (D2D) communication according to an embodiment of the present invention.
  • D2D device-to-device
  • the D2D device 104 determines in step 401 whether the transmit/receive state will be switched in the data frame; the determination may be based, for example, on a pre-defined, based on an indication by the access point 102, or based on coordination with another device 104. result.
  • the symbol position of the reserved handover time in the data frame i.e., the location of the handover symbol.
  • the location may be, for example, predefined or indicated by access point 102, or determined based on inter-device coordination.
  • step 403 within the determined switching symbol, a specific symbol structure, that is, a partial symbol structure generated by the method according to an embodiment of the present invention, is transmitted or received, and the switching time reserved in the switching symbol is performed. Switching of the send/receive status.
  • determining whether to switch the transmission/reception state in step 401 comprises determining that handover is required when the data frame is different from the transmission/reception state of the previous data frame or the subsequent data frame.
  • the switching symbol determined when the data frame is different from the previous data frame transmission/reception state in step 402 and not switched at the end of the previous data frame may be the data frame. Start symbol.
  • step 402 when the data frame is different from the transmission/reception state of the latter data frame and is not switched at the beginning of the latter data frame,
  • the switching symbol can be the last symbol of the data frame.
  • the switching symbol determined when the data frame is different from the previous and succeeding data frame transmission/reception states in step 402 and is not switched when the preceding and succeeding data frames are not switched may be the end symbol of the data frame and Start symbol.
  • Figure 5 is a diagram showing the location of a switching symbol in a data frame, in accordance with some embodiments of the present invention.
  • the data frame is a transmission/transmission subframe.
  • the partial symbol structure may be located at the end of the sub-frame, in which case the partial symbol structure has the structure of symbol C in FIG.
  • the partial symbol structure may be the start symbol located in the sub-frame, in which case the partial symbol structure has the structure of symbol D in Figure 3.
  • the partial symbol structure may be located at the beginning symbol and the last symbol of the subframe, in which case the start symbol has the structure of the symbol D in FIG. 3, and the end symbol has the structure as shown in FIG. The structure of the symbol C.
  • LTE D2D background is merely an example of wireless communication, and embodiments of the present invention may be applied in other similar systems.
  • N se the number of user data constellation symbols that can be loaded in the data frame
  • the user data constellation symbol is represented as ⁇ , ⁇ , ⁇ , ..., 6 ⁇ .
  • the sequence of symbols is then divided into a number of symbol vectors so that DFT precoding employed in LTE uplink can be applied subsequently to reduce the average ratio (PAPR) to achieve higher amplifier efficiency and potentially lower out-of-band emissions.
  • the constellation symbol is converted into a plurality of symbol vectors, which respectively correspond to one SC-FDMA symbol. It should be noted that in this implementation of the invention it is used for
  • the symbol vectors of the start and end SC-FDMA symbols are obtained with a length of NJ2, and the symbol vectors corresponding to other SC-FDMA symbols include Nse symbol elements.
  • Each symbol vector can represent the following: d A d
  • ⁇ ' ⁇ is obtained by half-length DFT (N sc /2-point DFT) precoding, while other vectors are pre-processed by full-length DFT ( ⁇ point DFT) Coding obtained. Then the vector of length N sc /2 ⁇ , the sign of ⁇ is placed on the even subcarrier, and the other subcarriers are set to zero, thus ⁇ . The length of , expands to Nse , which is the same length as other vectors.
  • These vectors are then mapped onto the assigned subcarriers, for example in this embodiment, Mapped to the subcarriers used to discover the channel.
  • the subcarriers may be obtained automatically by the UE or scheduled by the access point.
  • the vector is converted to the time domain by an IDFT operation.
  • the partial repetition symbol sampling can also be used to extend the CP. Since the reserved switching time does not normally occupy all of the repeated symbols, a part can be used for the CP for some potential purpose, for example for auxiliary time and/or frequency synchronization.
  • FIG. 6 shows a schematic block diagram of a device 600 for reserving handover time in device-to-device (D2D) communication.
  • the apparatus 600 includes a precoding unit 601 configured to perform discrete Fourier transform (DFT) precoding on constellation symbols of user data to obtain a precoded symbol vector; mapping unit 602, configured Mapping the precoded symbol vector to a portion of the equally spaced subcarriers while leaving the other allocated subcarriers unused; the transform unit 603 is configured to map the mapped by inverse discrete Fourier transform (IDFT) The symbol vector is transformed into the time domain such that the generated time domain symbol vector presents a repeating structure; and the removing unit 604 is configured to remove at least a portion of the redundant repeat from the time domain symbol vector having the repeating structure The symbol is sampled to obtain a partial symbol structure in which the idle time obtained by at least partially removing the symbol is reserved as the switching time.
  • DFT discrete Fourier transform
  • the length of the precoded symbol vector obtained in the precoding unit 601 is half of the number of allocated subcarriers; and wherein the precoded symbol vector is mapped only to even subcarriers.
  • the removal unit 604 can be further configured to generate a length-expanded cyclic prefix (CP) in the partial symbol structure, and the length extension is obtained using at least partially redundant repetitive symbol sampling.
  • CP cyclic prefix
  • FIG. 7 shows a schematic block diagram of an apparatus 700 for performing a transmit/receive state switch in device-to-device (D2D) communication.
  • the apparatus 700 includes a first determining unit 701 configured to determine whether to switch a transmission/reception state in a data frame.
  • the second determining unit 702 is configured to determine in a data frame to be switched. Determining a switching symbol position; and processing unit 703 configured to transmit/receive a partial symbol structure within the determined switching symbol and to complete switching of the transmission/reception state by using a switching time reserved in the partial symbol structure.
  • the first determining unit 701 may be further configured to determine that the data frame is different from the sending/receiving state of the previous data frame or the subsequent data frame. Switch.
  • the second determining unit 702 may be further configured to: when the data frame is different from a previous data frame transmission/reception state and not performed at the end of the previous data frame The symbol position is determined to be the start symbol of the data frame upon handover.
  • the second determining unit 702 is further configured to: when the data frame is different from the next data frame transmission/reception state and not to switch at the beginning of the latter data frame The symbol position is determined to be the end symbol of the data frame.
  • the second determining unit 702 may be further configured to determine that the data frame is different from the previous and succeeding data frame transmission/reception states and determine that the symbol position is when the data frames are not switched. The end symbol and start symbol of the data frame.
  • the above device may be a device that is included or applied to the user device 104.
  • FIG. 8 illustrates an exemplary block diagram of an apparatus that may be included or applied to a UE 104 that may be configured to perform the functions/method steps as described in the embodiments herein.
  • the components, devices or components illustrated in Figure 8 or described below with respect to Figure 8 may not be mandatory, and thus some may be omitted in certain embodiments.
  • some embodiments may include more or different components, devices or elements than those illustrated in FIG. 8 and described with respect to FIG. Referring now to FIG.
  • UE 104 may include, or otherwise be in communication with, processing system 810, which may be configured to perform operations in accordance with the exemplary embodiments disclosed herein.
  • Processing system 810 can be configured to perform data processing, execution of applications, and/or other processing and management services in accordance with one or more exemplary embodiments.
  • the UE 104, or portions or components thereof, such as the processing system 810 can be implemented as or include a chip or chipset.
  • UE 104 or processing system 810 can be configured to implement one embodiment of the present invention on a single chip or as a separate "system on a chip.”
  • a chip or chipset may constitute a means for performing one or more operations to provide the functionality described herein.
  • processing circuit 810 can include a processor 812, and in some embodiments, can further include memory 814.
  • Processing system 810 can communicate with one user interface 816 and/or a communication interface 818, or otherwise control them.
  • processing system 810 can be implemented as a circuit chip (e.g., an integrated circuit chip) that is configured (e.g., by hardware, software, or a combination of hardware and software) to perform the operations described herein.
  • User interface 816 (if implemented) can communicate with processing system 810 to receive an indication of user input at user interface 816 and/or provide the user with some form, such as audible, visual, mechanical, or otherwise. Output.
  • Communication interface 818 may contain one or more interface mechanisms that enable communication with other devices and/or networks.
  • the communication interface 818 can be any device, such as one device or circuit included in hardware or a combination of hardware and software configured to receive data from or transmit data to a network, and/or Any other device or module that is in communication with processing system 810.
  • communication interface 818 can support D2D communication with another UE 104, such as through a D2D link 110.
  • memory 814 may include one or more non-transitory memory devices such as, for example, volatile and/or non-volatile memory that may be fixed or removable.
  • the memory 814 can be configured to store information, data, applications, instructions, etc., such that the UE 104 can perform various functions/method steps in accordance with one or more exemplary embodiments.
  • memory 814 can be configured to be cached for use by processor 812 Input data.
  • memory 814 can be configured to store instructions for execution by processor 812.
  • the memory 814 can include one or more databases that can store various files, content, or data sets.
  • Processor 812 can be implemented in many different ways.
  • processor 812 can be implemented as various processing devices, such as one or more microprocessors or other processing elements, a coprocessor, a controller or include, for example, an ASIC (Application Specific Integrated Circuit), an FPGA ( Various other computing or processing devices for integrated circuits such as field programmable gate arrays, or the like.
  • processor 812 can be configured to execute instructions stored on memory 814 or otherwise accessible by processor 812.
  • the processor 812 can be representative of an entity capable of performing operations in accordance with embodiments of the present invention (e.g., physically implemented on a circuit) to a processing system 810. form) .
  • processor 812 when processor 812 is implemented as an ASIC, FPGA or the like, the processor 812 can be hardware that is specifically configured to perform the operations described herein.
  • processor 812 when processor 812 is implemented as an executor of software instructions, the instructions may specifically configure processor 812 to perform one or more of the operations described herein.
  • processor 812 may be implemented to include, or otherwise control, a D2D manager 820.
  • D2D manager 820 can be implemented as a variety of devices, such as circuitry, hardware, a computer including a processing device (eg, processor 812) stored on a computer readable medium (eg, memory 814) A computer program product readable by program instructions, or some combination thereof.
  • the D2D manager 820 may be capable of communicating with one or more memories 814 or communication interfaces 818 to access, receive, and/or transmit data.
  • determining whether to perform a transmit/receive state switch in operation of the apparatus may be based on a predefined value, such as a value/decision criterion stored in 814 in memory, or based on obtaining from access point 102 via communication interface 818.
  • the indication is based on the coordination result obtained from the other device 104 via the communication interface 818.
  • determining the transmit/receive state in the operation of the device will be The operation of changing and determining the symbol location at which the handover time is reserved includes obtaining the location of the handover symbol by, for example, based on a pre-defined stored in memory 814 or based on an indication obtained from access point 102 via communication interface 818, or It is based on coordination between devices via communication interface 818.
  • Figure 9 shows computer simulation results of D2D communication performance obtained in accordance with one embodiment of the present invention.
  • the parameters used in the simulation are shown in Table 1.
  • the simulation result shows that the method for obtaining the reserved switching time based on the partial symbol structure proposed by the present invention has a gain of about 0.3 to 0.4 dB compared with the direct puncturing method in the prior art, and the result depends on each The number of SC-FDMA symbols available in the discovery sub-frame.

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Abstract

La présente invention concerne, dans certains modes de réalisation, un procédé de réservation de temps de commutation dans une communication de dispositif à dispositif (D2D). Le procédé comporte les étapes consistant à: effectuer un précodage à transformée de Fourier discrète (DFT) sur un symbole en constellation de données d'utilisateur et projeter un vecteur de symboles après précodage sur certaines sous-porteuses régulièrement espacées de façon à mettre au repos d'autres sous-porteuses attribuées; transformer le vecteur de symboles après projection vers un domaine temporel via une transformée de Fourier discrète inverse (IDFT) de façon à permettre à un vecteur de symboles en domaine temporel qui est généré de présenter une structure dupliquée; et supprimer au moins une partie des échantillons de symboles redondants et dupliqués du vecteur de symboles en domaine temporel doté de la structure dupliquée de façon à obtenir certaines structures de symboles, au moins une partie du temps de repos obtenu en raison de la suppression des symboles étant réservée en tant que temps de commutation. La présente invention concerne également un appareil configuré pour mener à bien le procédé.
PCT/CN2013/084506 2013-09-27 2013-09-27 Procédé et dispositif de réservation de temps de commutation en communication de dispositif à dispositif WO2015042889A1 (fr)

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PCT/CN2013/084506 WO2015042889A1 (fr) 2013-09-27 2013-09-27 Procédé et dispositif de réservation de temps de commutation en communication de dispositif à dispositif
CN201380079434.9A CN105519226B (zh) 2013-09-27 2013-09-27 在设备到设备（d2d）通信中预留切换时间的方法和设备

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