WO2017049527A1 - 数据传输装置、方法以及通信系统 - Google Patents

数据传输装置、方法以及通信系统 Download PDF

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Publication number
WO2017049527A1
WO2017049527A1 PCT/CN2015/090521 CN2015090521W WO2017049527A1 WO 2017049527 A1 WO2017049527 A1 WO 2017049527A1 CN 2015090521 W CN2015090521 W CN 2015090521W WO 2017049527 A1 WO2017049527 A1 WO 2017049527A1
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Prior art keywords
data transmission
cyclic shift
cyclic
determining
transmission device
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PCT/CN2015/090521
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English (en)
French (fr)
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郤伟
周华
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富士通株式会社
郤伟
周华
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Priority to PCT/CN2015/090521 priority Critical patent/WO2017049527A1/zh
Publication of WO2017049527A1 publication Critical patent/WO2017049527A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data transmission apparatus, method, and communication system.
  • V2X Vehicle-to-Evation
  • FIG. 1 is a schematic diagram of a typical application scenario of vehicle networking communication.
  • the vehicle networking communication may include three typical application scenarios: vehicle-to-vehicle communication (V2V, Vehicle-to-Vehicle), which is applied to fast moving. Communication between vehicles (such as vehicle 1 and vehicle 2 shown in Figure 1); Vehicle-to-Pedestrian (V2P, Vehicle-to-Pedestrian), applied to fast moving vehicles and pedestrians of handheld user equipment (as shown in Figure 1) Communication between the vehicle 1 and the pedestrian); and V2I (Vehicle-to-Infrastructure), that is, communication between the vehicle and the infrastructure (such as the vehicle 1 and the base station shown in FIG. 1).
  • V2V Vehicle-to-vehicle communication
  • V2P Vehicle-to-Pedestrian
  • FIG. 1 is a schematic diagram of a typical application scenario of vehicle networking communication.
  • the vehicle networking communication may include three typical application scenarios: vehicle-to-vehicle communication (V2V, Vehicle-to-Vehi
  • LTE/LTE-A currently supports device-to-device (D2D), it is also called Sidelink communication in the LTE/LTE-A standard. So the most straightforward solution is to implement V2V communication, for example, based on the D5D PC5 interface.
  • D2D device-to-device
  • Retransmission is essentially a time diversity technique.
  • the network topology is constantly changing, it is difficult to ensure that the network topology during retransmission remains unchanged, so the retransmission technique is not suitable.
  • Embodiments of the present invention provide a data transmission apparatus, method, and communication system.
  • the transmission end can be transparent to the receiving end without additional signaling, and the reliability of the communication link can be improved.
  • a data transmission apparatus includes:
  • a number determining unit determining the number of cyclic shifts M
  • a value determining unit determining M cyclic shift values according to the number of cyclic shifts
  • a precoding unit that performs precoding based on cyclic delay diversity according to the data to be transmitted and the reference signal according to the M cyclic shift values
  • the sending unit sends the pre-coded data and the reference signal to the receiving end.
  • a data transmission method includes:
  • the transmitting end determines the number of cyclic shifts M
  • the precoded data and the reference signal are sent to the receiving end.
  • a communication system comprising:
  • the transmitting end determines the number of cyclic shifts M and determines M cyclic shift values according to the number of cyclic shifts; Performing precoding based on cyclic delay diversity based on the M cyclic shift values and the reference signal; and transmitting the precoded data and the reference signal to the receiving end;
  • the receiving end receives the data and the reference signal, estimates an equivalent channel according to the reference signal, and demodulates the data.
  • a computer readable program wherein when the program is executed in a user device, the program causes a computer to execute a data transmission method as described above in the user device.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute a data transmission method as described above in a user equipment.
  • a computer readable program wherein when the program is executed in a base station, the program causes a computer to execute a data transmission method as described above in the base station.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a data transmission method as described above in a base station.
  • the beneficial effects of the embodiments of the present invention are: determining a plurality of CS values according to the number of cyclic shifts (CS, Cycle Shift); performing cyclic-based delay diversity (CDD, Cycle Delay) on data to be transmitted and reference signals according to multiple CS values Diversity) precoding; and transmitting the precoded data and the reference signal to the receiving end.
  • CS cyclic shifts
  • CDD cyclic-based delay diversity
  • FIG. 1 is a schematic diagram of a typical application scenario of car network communication
  • FIG. 2 is a schematic diagram of a data transmission method according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of a data transmission device according to Embodiment 2 of the present invention.
  • FIG. 4 is another schematic diagram of a data transmission device according to Embodiment 2 of the present invention.
  • Figure 5 is another schematic diagram of a data transmission device according to Embodiment 2 of the present invention.
  • FIG. 6 is another schematic diagram of a data transmission device according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of a value determining unit according to Embodiment 2 of the present invention.
  • FIG. 8 is another schematic diagram of a value determining unit according to Embodiment 2 of the present invention.
  • FIG. 9 is another schematic diagram of a value determining unit according to Embodiment 2 of the present invention.
  • FIG. 10 is a schematic structural diagram of a transmitting end according to Embodiment 2 of the present invention.
  • Figure 11 is a schematic diagram of a communication system in accordance with Embodiment 3 of the present invention.
  • the embodiment of the invention provides a data transmission method, which is described from the transmitting end side.
  • FIG. 2 is a schematic diagram of a data transmission method according to an embodiment of the present invention. As shown in FIG. 2, the data transmission method includes:
  • Step 201 the transmitting end determines the number of cyclic shifts M
  • Step 202 The transmitting end determines M cyclic shift values according to the number of cyclic shifts
  • Step 203 The transmitting end performs base according to the data to be transmitted and the reference signal according to the M cyclic shift values. Precoding for cyclic delay diversity;
  • Step 204 The transmitting end sends the pre-coded data and the reference signal to the receiving end.
  • FIG. 2 only schematically shows the steps related to the present invention.
  • the data transmission method can be applied to a car network communication system.
  • the transmitting end may be the vehicle 1 shown in FIG. 1
  • the receiving end is the vehicle 2, the pedestrian or the base station shown in FIG. 1; or the transmitting end is the vehicle 2, the pedestrian or the base station shown in FIG. 1 , and the receiving end is FIG. 1 .
  • the invention is not limited thereto, and for example, the method of the invention can also be applied to other communication systems, such as cellular internet of things.
  • V2V communication in the car network communication system will be described as an example.
  • the transmitting end may first determine the CS number M.
  • the CS number determines the diversity gain of the CDD precoding. Therefore, for example, the CS number can be determined according to the following criteria: try to make the CS value not collide or reduce the probability that the CS value generates a collision, and the reliability requirement is higher. The more CS, the more.
  • the number of CSs may be determined based on the density or number of user equipment. That is, the density or quantity of surrounding user equipments can be obtained, and the number of CSs is determined according to the density or quantity of the surrounding user equipments.
  • the transmitting end may detect a synchronization signal (for example, a D2D discovery signal), thereby obtaining a density (or quantity) of the synchronization source around the transmitting end, and using the density (or quantity) as the density (or quantity) of the surrounding user equipment. ) instructions.
  • a synchronization signal for example, a D2D discovery signal
  • the density (or quantity) of user equipment around the transmitting end is assumed that the density (or quantity) of user equipment around the transmitting end is
  • the transmitting end may determine the number of CSs as N1 if the density or quantity of the surrounding user equipment is less than a first preset threshold; and the density or quantity of the surrounding user equipment is greater than or equal to In the case of the first preset threshold, the number of CSs is determined to be smaller than N2 of the N1.
  • the process can be expressed as a monotonous non-increasing function E.g,
  • the number of CSs (or the number of surrounding user equipments at the transmitting end does not exceed and exceed the number of CSs of the threshold N threshold , N 1 > N 2 ; the threshold N threshold may be defined in advance, or may be configured in advance by the serving base station.
  • the CS number M can be determined as f(N).
  • the more the number of user equipments ie, the denser the distribution
  • the above formula (1) is only a specific embodiment of the present invention.
  • the present invention is not limited thereto, and for example, other criteria than the formula (1) may be employed, and the CS number is determined according to the density or the number of user equipments.
  • the number of CSs may be determined based on the speed of the user equipment. That is, obtaining a speed associated with the transmitting end and/or the receiving end; and determining the CS number according to the speed.
  • the speed may include one or any combination of the following: a moving speed of the transmitting end, a moving speed of the receiving end, and a relative speed between the transmitting end and the receiving end.
  • the transmitting end can obtain the moving speed of the transmitting end directly through its own meter (for example, a speed sensor).
  • the speed of the corresponding receiving end may be indicated by the serving base station of the transmitting end (for example, the transmitting end and the receiving end are in the same cell) or forwarded (for example, the transmitting end and the receiving end are in different cells).
  • the transmitting end is equipped with a radar device, the speed of the corresponding receiving end can be calculated by the radar device.
  • the transmitting end can also calculate the relative speed between the corresponding receiving end.
  • the transmitting end may determine the number of CSs as N3 if the speed is less than the second preset threshold; and if the speed is greater than or equal to the second preset threshold, The number of CSs is determined to be greater than N4 of the N3.
  • the velocity vector v [v tx , v rx , v relative ], where v tx is the moving speed of the transmitting end, v rx is the moving speed of the receiving end, and v relative is the relative speed.
  • the sender can determine the number of CSs used, that is, the order of the diversity gain.
  • the process can be expressed as a monotonically increasing function of the velocity vector E.g,
  • the CS number M can be determined as g(v).
  • the present invention is not limited thereto, for example, it is possible to divide more speed levels, and it is also possible to consider the case where v rx and/or v relative are compared with a threshold.
  • the higher the number of CSs can be determined in the case where the speed (the moving speed of the transmitting end, or the moving speed of the receiving end, or the relative speed) is higher, thereby improving the reliability of the communication link.
  • the above formula (2) is only a specific example of the present invention, but the present invention is not limited thereto.
  • other criteria different from the formula (2) may be used, and the number of CSs is determined according to the speed of the user equipment. .
  • the number of CSs may also be determined according to configuration information of the base station. That is, the preset number of base station configurations is obtained; and the number of cyclic shifts is determined according to the preset number.
  • the base station may configure a preset number for one or more group user equipments, and the user equipments in the same group are allocated the same preset number, and the user equipments in different groups are configured differently. Set the number.
  • the transmitting end may directly use the preset number configured by the serving base station, and determine the preset number as the CS number; or may further determine the CS number after performing the appropriate conversion on the preset number.
  • the preset number may be configured by the serving base station by using high layer signaling, such as RRC (Radio Resource Control) signaling.
  • the above is a schematic illustration of how to determine the number of CSs. It should be noted that the above three embodiments may be used alone or in any combination. Further, the present invention is not limited to the above embodiment, and the number of CSs may be determined according to actual conditions.
  • the transmitting end may generate M CS values according to the CS number.
  • the sender has been pre-configured with a CS resource pool that includes multiple (eg, N, N is greater than M) CS values; the CS resource pool may be defined in advance or may be pre-configured by the base station.
  • mapping selection may be employed to calculate selection index information for selecting CS values using the link identification such that each selected CS value is associated with a link identity.
  • the transmitting end may generate M selection indexes according to the edge link synchronization identifier and/or the edge link group destination identifier; and select the M CS values from the CS resource pool according to the M selection indexes. .
  • each CS value is an edge link synchronization identifier.
  • And/or side link group destination identifier Function, ie C is the CS resource pool, and h m () is the function.
  • the M CS values may be randomly selected from the CS resource pool by using a random selection method.
  • the sender randomly selects M CS values from the CS resource pool with a moderate probability.
  • C is the CS resource pool.
  • a perceptual random selection method may also be used to select M CS values from a portion of resources to avoid or reduce collisions of CS values.
  • the sending end may obtain the CS value of the surrounding user equipment according to the detection of the reference signal of the surrounding user equipment, and determine the remaining resources after removing the CS value of the surrounding user equipment in the CS resource pool;
  • the M CS values are randomly selected from the remaining resources.
  • the transmitting end may first detect the Demodulation Reference Signal (DMRS) of the surrounding user equipment, so as to obtain the CS value that the surrounding user equipment is using, which is recorded as the set C using .
  • DMRS Demodulation Reference Signal
  • the sender can get the difference between the two sets. Moderately randomly selecting M CS values, ie
  • the above is a schematic illustration of how to determine the CS value. It should be noted that the present invention is not limited to the above embodiment, and the CS value may be determined according to actual conditions.
  • the transmitting end may perform CDD-based precoding on the data to be transmitted and the reference signal (for example, DMRS) according to the M CS values. Therefore, multiple signals can be generated for a single data stream in the cyclic delay domain, which can improve the reliability of the transmission link and is applicable to a scenario in which the network topology changes.
  • the reference signal for example, DMRS
  • CDD-based precoding can be implemented, for example, using the following formula:
  • k is a subcarrier number
  • C is a cyclic shift resource pool
  • is the size of the cyclic shift resource pool
  • M is the number of cyclic shifts
  • y (0) (k) is the data to be transmitted
  • z (0) (k), ..., z (M-1) (k) is precoded signal.
  • CDD precoding of CDD
  • related art for example, 3GPP Release 8
  • CDD applies CDD to a single data stream such that single data The reliability probability of the flow becomes larger.
  • the sender of the present invention performs precoding of the CDD on both data and pilot/reference symbols (eg, DMRS).
  • DMRS data and pilot/reference symbols
  • the receiving end can directly estimate the equivalent channel and demodulate the data, thereby achieving complete transparency to the receiving end.
  • the receiving end does not need to know the CS value used by the transmitting end, but if the receiving end knows the CS value, it can obtain better performance at the time of demodulation.
  • multiple CS values are determined according to the number of CSs; the number to be transmitted according to multiple CS values And performing CDD-based precoding according to the reference signal; and transmitting the precoded data and the reference signal to the receiving end.
  • the embodiment of the invention provides a data transmission device, which is configured at a transmitting end.
  • the same content of the embodiment as that of the embodiment 1 will not be described again.
  • FIG. 3 is a schematic diagram of a data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 3, the data transmission apparatus 300 includes:
  • the number determining unit 301 determines the number of cyclic shifts M
  • the value determining unit 302 determines M cyclic shift values according to the number of cyclic shifts
  • a precoding unit 303 performing precoding based on cyclic delay diversity according to the data to be transmitted and the reference signal according to the M cyclic shift values;
  • the sending unit 304 sends the pre-coded data and the reference signal to the receiving end.
  • FIG. 3 only schematically shows the components related to the present invention.
  • the data transmission apparatus 400 includes: a number determining unit 301, a value determining unit 302, a precoding unit 303, and a transmitting unit 304, as described above. Said.
  • the data transmission device 400 may further include:
  • the first information acquiring unit 401 acquires the density or quantity of the surrounding user equipments
  • the number determining unit 301 may be specifically configured to: determine the number of cyclic shifts according to a density or a quantity of the surrounding user equipment. For example, the number determining unit 301 determines the number of cyclic shifts as N1 if the density or the number of surrounding user equipments is less than a first preset threshold; the density of the surrounding user equipment or When the number is greater than or equal to the first preset threshold, the number of cyclic shifts is determined to be less than N2 of the N1.
  • FIG. 5 is another schematic diagram of a data transmission apparatus according to an embodiment of the present invention.
  • the data transmission apparatus 500 includes: a number determining unit 301, a value determining unit 302, a precoding unit 303, and a transmitting unit 304, as described above. Said.
  • the data transmission device 500 may further include:
  • the second information acquiring unit 501 is configured to acquire a speed associated with the sending end and/or the receiving end, where the speed may include one or any combination of the following information: a moving speed of the sending end, the The moving speed of the receiving end and the relative speed between the transmitting end and the receiving end.
  • the number determining unit 301 is specifically configured to: determine the number of cyclic shifts according to the speed. For example, the number determining unit 301 determines the number of cyclic shifts as N3 if the speed is less than a second preset threshold; and the speed is greater than or equal to the second preset threshold. In the case, the number of cyclic shifts is determined to be greater than N4 of the N3.
  • FIG. 6 is another schematic diagram of a data transmission apparatus according to an embodiment of the present invention.
  • the data transmission apparatus 600 includes: a number determining unit 301, a value determining unit 302, a precoding unit 303, and a transmitting unit 304, as described above. Said.
  • the data transmission device 600 may further include:
  • the number receiving unit 601 acquires a preset number of configurations of the base station
  • the number determining unit 301 is specifically configured to: determine the number of cyclic shifts according to the preset number.
  • the base station may configure the preset number for one or more group user equipments, and the user equipments in the same group are assigned the same preset number, and the user equipments in different groups are configured with different preset numbers. .
  • FIG. 7 is a schematic diagram of a value determining unit 302 according to an embodiment of the present invention. As shown in FIG. 7, the value determining unit 302 may include:
  • the index generating unit 701 generates M selection indexes according to the edge link synchronization identifier and/or the edge link group destination identifier;
  • the first selecting unit 702 selects the M cyclic shift values from the cyclic shift resource pool according to the M selection indexes.
  • FIG. 8 is another schematic diagram of the value determining unit 302 of the embodiment of the present invention. As shown in FIG. 8, the value determining unit 302 may include:
  • the second selecting unit 801 randomly selects the M cyclic shift values from the cyclic shift resource pool.
  • FIG. 9 is another schematic diagram of the value determining unit 302 of the embodiment of the present invention. As shown in FIG. 9, the value determining unit 302 may include:
  • the signal detecting unit 901 obtains the surrounding user according to the detection of the reference signal of the surrounding user equipment. Prepared cyclic shift value;
  • the resource determining unit 902 determining remaining resources after removing the cyclic shift value of the surrounding user equipment in the cyclic shift resource pool;
  • the third selecting unit 903 randomly selects the M cyclic shift values from the remaining resources.
  • the precoding unit 303 can use the following formula:
  • k is a subcarrier number
  • C is a cyclic shift resource pool
  • is the size of the cyclic shift resource pool
  • M is the number of cyclic shifts
  • y (0) (k) is the data to be transmitted
  • z (0) (k), ..., z (M-1) (k) is precoded signal.
  • the embodiment of the invention further provides a transmitting end, which is configured with the data transmission device 300 as described above.
  • the sending end may be a user equipment carried by the vehicle, a user equipment carried by the pedestrian, or a base station in the infrastructure.
  • FIG. 10 is a schematic diagram of a configuration of a transmitting end according to an embodiment of the present invention.
  • the transmitting end 1000 can include a central processing unit (CPU) 200 and a memory 210; the memory 210 is coupled to the central processing unit 200.
  • the memory 210 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 200.
  • the functions of the data transmission device 300 can be integrated into the central processing unit 200.
  • the central processing unit 200 can be configured to implement the data transmission method as described in embodiment 1.
  • the transmitting end 1000 may further include: a transceiver 220, an antenna 230, and the like; wherein the functions of the foregoing components are similar to those of the prior art, and details are not described herein again. It should be noted that the transmitting end 1200 does not have to include all the components shown in FIG. 10; in addition, the transmitting end 1000 may further include components not shown in FIG. 10, and reference may be made to the prior art.
  • a plurality of CS values are determined according to the number of CSs; CDD-based precoding is performed on the data to be transmitted and the reference signals according to the plurality of CS values; and the pre-coded data and the reference signals are transmitted to the receiving end.
  • the embodiment of the present invention further provides a communication system, and the same content as Embodiment 1 or 2 is not described herein.
  • FIG. 11 is a schematic diagram of a communication system according to an embodiment of the present invention. As shown in FIG. 11, the communication system 1100 includes a transmitting end 1101 and a receiving end 1102.
  • the transmitting end 1101 determines a cyclic shift number M and determines M cyclic shift values according to the cyclic shift number; performs data based on the M cyclic shift values on the data to be transmitted and the reference signal based on the cyclic delay diversity Precoding; and transmitting the precoded data and the reference signal to the receiving end 1102;
  • the receiving end 1102 receives the data and the reference signal, estimates an equivalent channel based on the reference signal, and demodulates the data.
  • the communication system may be a car network communication system; however, the present invention is not limited thereto, and may be other communication systems, for example.
  • An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a user equipment, the program causes a computer to execute the data transmission method as described in Embodiment 1 in the user equipment.
  • An embodiment of the present invention provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the data transmission method as described in Embodiment 1 in a user equipment.
  • An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to execute the data transmission method as described in Embodiment 1 in the base station.
  • An embodiment of the present invention provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the data transmission method as described in Embodiment 1 in a base station.
  • the above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.
  • One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described in the figures and/or one or more combinations of the functional blocks may also be implemented as a combination of computing devices. For example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

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Abstract

一种数据传输装置、方法以及通信系统。所述数据传输方法包括：发送端确定循环移位个数M；根据所述循环移位个数确定M个循环移位值；根据所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及将预编码后的所述数据以及所述参考信号发送给接收端。由此，不但可以在传输中不需要额外信令通知接收端而实现对接收端透明，而且可以提高通信链路的可靠性。

Description

数据传输装置、方法以及通信系统 技术领域
本发明涉及通信技术领域，特别涉及一种数据传输装置、方法以及通信系统。
背景技术
随着长期演进(LTE，Long Term Evolution)/LTE-A(LTE-Advanced)通信技术大范围和全球化的普及，该技术得到越来越广泛的应用。在3GPP SA1近期的研究工作中，车联网(V2X，Vehicle-to-everything)通信作为一项重要研究被立项。到目前为止，已经涌现了大量的V2X通信系统和项目，典型的有IEEE 802.11p专用短距离通信系统(DSRC，dedicated short range communications)、智能交通系统(ITS，intelligent transportation system)等等。
图1是车联网通信的典型应用场景的一示意图，如图1所示，车联网通信可以包括三种典型的应用场景：车车通信(V2V，Vehicle-to-Vehicle)，应用于快速移动的车辆(如图1所示的车辆1和车辆2)之间的通信；车人通信(V2P，Vehicle-to-Pedestrian)，应用于快速移动的车辆与手持用户设备的行人(如图1所示的车辆1和行人)之间的通信；以及V2I(Vehicle-to-Infrastructure)，即车辆与基础设施(如图1所示的车辆1和基站)之间的通信。
另一方面，由于目前LTE/LTE-A已经支持设备间通信(D2D，device-to-device)，在LTE/LTE-A标准中也被称为边链路(Sidelink)通信。所以最直接的方案是基于D2D的PC5接口实现例如V2V通信。
但是，由于PC5接口的边链路最初是为D2D通信设计的，而且V2V通信与D2D通信相比截然不同，也有其自身的特点。由于车的高速移动性，速度可高达280km/h，V2V通信链路更加不稳定，而且通信网络拓扑也是在不断变化的。所以在这种场景下，最大的挑战之一就是如何可靠地将信息在车与车、车与行人、车与网络之间成功传输。
为了提高例如V2V通信链路的可靠性，一般可以采用如下方法：
(1)降低编码速率。但是在给定消息大小的情况下，该方法会占用更多的资源，从而降低资源的使用效率。
(2)重传，重传本质上是一种时间分集技术。但是对于网络拓扑不断变化的例如V2V通信场景来说，很难保证重传期间的网络拓扑保持不变，因此重传技术并不适合。
(3)空时分组码(STBC，Space time block code)/空频分组码(SFBC，Space frequency block code)。但是该方法需要额外的信令通知接收端，否则接收端无法正确地检测出数据。
应该注意，上面对技术背景的介绍只是为了方便对本发明的技术方案进行清楚、完整的说明，并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本发明的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。
发明内容
本发明实施例提供一种数据传输装置、方法以及通信系统。既可以在传输中不需要额外信令通知接收端而实现对接收端透明，又可以提高通信链路的可靠性。
根据本发明实施例的第一个方面，提供一种数据传输装置，配置于发送端，所述数据传输装置包括：
个数确定单元，确定循环移位个数M；
值确定单元，根据所述循环移位个数确定M个循环移位值；
预编码单元，根据所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及
发送单元，将预编码后的所述数据以及所述参考信号发送给接收端。
根据本发明实施例的第二个方面，提供一种数据传输方法，所述数据传输方法包括：
发送端确定循环移位个数M；
根据所述循环移位个数确定M个循环移位值；
根据所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及
将预编码后的所述数据以及所述参考信号发送给接收端。
根据本发明实施例的第三个方面，提供一种通信系统，所述通信系统包括：
发送端，确定循环移位个数M并根据所述循环移位个数确定M个循环移位值； 基于所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及将预编码后的所述数据以及所述参考信号发送给接收端；
接收端，接收所述数据以及所述参考信号，根据所述参考信号估计出等效信道并对所述数据进行解调。
根据本发明实施例的又一个方面，提供一种计算机可读程序，其中当在用户设备中执行所述程序时，所述程序使得计算机在所述用户设备中执行如上所述的数据传输方法。
根据本发明实施例的又一个方面，提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在用户设备中执行如上所述的数据传输方法。
根据本发明实施例的又一个方面，提供一种计算机可读程序，其中当在基站中执行所述程序时，所述程序使得计算机在所述基站中执行如上所述的数据传输方法。
根据本发明实施例的又一个方面，提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在基站中执行如上所述的数据传输方法。
本发明实施例的有益效果在于，根据循环移位(CS，Cycle Shift)个数确定多个CS值；根据多个CS值对待传输的数据以及参考信号进行基于循环时延分集(CDD，Cycle Delay Diversity)的预编码；以及将预编码后的数据以及参考信号发送给接收端。由此，不但可以在传输中不需要额外信令通知接收端而实现对接收端透明，而且可以提高通信链路的可靠性。
参照后文的说明和附图，详细公开了本发明的特定实施方式，指明了本发明的原理可以被采用的方式。应该理解，本发明的实施方式在范围上并不因而受到限制。在所附权利要求的精神和条款的范围内，本发明的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和/或示出的特征可以以相同或类似的方式在一个或更多个其它实施方式中使用，与其它实施方式中的特征相组合，或替代其它实施方式中的特征。
应该强调，术语“包括/包含”在本文使用时指特征、整件、步骤或组件的存在，但并不排除一个或更多个其它特征、整件、步骤或组件的存在或附加。
附图说明
参照以下的附图可以更好地理解本发明的很多方面。附图中的部件不是成比例 绘制的，而只是为了示出本发明的原理。为了便于示出和描述本发明的一些部分，附图中对应部分可能被放大或缩小。
在本发明的一个附图或一种实施方式中描述的元素和特征可以与一个或更多个其它附图或实施方式中示出的元素和特征相结合。此外，在附图中，类似的标号表示几个附图中对应的部件，并可用于指示多于一种实施方式中使用的对应部件。
图1是车联网通信的典型应用场景的一示意图；
图2是本发明实施例1的数据传输方法的一示意图；
图3是本发明实施例2的数据传输装置的一示意图；
图4是本发明实施例2的数据传输装置的另一示意图；
图5是本发明实施例2的数据传输装置的另一示意图；
图6是本发明实施例2的数据传输装置的另一示意图；
图7是本发明实施例2的值确定单元的一示意图；
图8是本发明实施例2的值确定单元的另一示意图；
图9是本发明实施例2的值确定单元的另一示意图；
图10是本发明实施例2的发送端的一构成示意图；
图11是本发明实施例3的通信系统的一示意图。
具体实施方式
参照附图，通过下面的说明书，本发明的前述以及其它特征将变得明显。在说明书和附图中，具体公开了本发明的特定实施方式，其表明了其中可以采用本发明的原则的部分实施方式，应了解的是，本发明不限于所描述的实施方式，相反，本发明包括落入所附权利要求的范围内的全部修改、变型以及等同物。
实施例1
本发明实施例提供一种数据传输方法，从发送端一侧进行说明。
图2是本发明实施例的数据传输方法的一示意图，如图2所示，所述数据传输方法包括：
步骤201，发送端确定循环移位个数M；
步骤202，发送端根据所述循环移位个数确定M个循环移位值；
步骤203，发送端根据所述M个循环移位值对待传输的数据以及参考信号进行基 于循环时延分集的预编码；以及
步骤204，发送端将预编码后的所述数据以及所述参考信号发送给接收端。
值得注意的是，图2仅示意性示出了与本发明相关的各步骤，关于数据传输时的其他步骤可以参考相关技术，此处不再赘述。
在本实施例中，所述数据传输方法可以被应用于车联网通信系统中。其中发送端可以为图1所示的车辆1，接收端为图1所示的车辆2、行人或基站；或者，发送端为图1所示的车辆2、行人或基站，接收端为图1所述的车辆1。但本发明不限于此，例如本发明的方法也可以应用于其他通信系统，例如蜂窝物联网中。
以下仅以车联网通信系统中的V2V通信为例进行说明。
在本实施例中，发送端可以首先确定CS个数M。其中，CS个数决定CDD预编码的分集增益大小，因此例如可以根据如下准则确定CS个数：尽量使CS值不产生碰撞或者降低CS值产生碰撞的概率，在可靠性要求越高的情况下CS个数越多。
在一个实施方式中，可以根据用户设备的密度或数量确定CS个数。即可以获取周围用户设备的密度或数量，并根据所述周围用户设备的密度或数量确定CS个数。
例如，发送端可以对同步信号(例如类似D2D发现信号)进行检测，从而得到该发送端周围的同步源的密度(或数量)，并将该密度(或数量)作为周围用户设备密度(或数量)的指示信息。为了便于描述，假设发送端的周围用户设备密度(或数量)为
Figure PCTCN2015090521-appb-000001
在本实施方式中，发送端可以在所述周围用户设备的密度或数量小于第一预设阈值的情况下，将CS个数确定为N1；在所述周围用户设备的密度或数量大于或等于所述第一预设阈值的情况下，将CS个数确定为小于所述N1的N2。
该过程可以表示为单调不增函数
Figure PCTCN2015090521-appb-000002
例如，
Figure PCTCN2015090521-appb-000003
其中，
Figure PCTCN2015090521-appb-000004
分别为发送端的周围用户设备密度(或数量)不超过和超过阈值Nthreshold的CS个数，N1＞N2；阈值Nthreshold可以预先被定义，或者也可以预先由服务基站配置。CS个数M可以被确定为f(N)。
由此，在用户设备越多(即分布越密集)的情况下可以将CS个数确定的越小，可以降低CS值发生碰撞的概率。值得注意的是，上式(1)仅是本发明的一个具体 例子，但本发明并不限于此，例如还可以采用不同于式(1)的其他准则，根据用户设备的密度或数量确定CS个数。
在另一个实施方式中，可以基于用户设备的速度确定CS个数。即获取与所述发送端和/或所述接收端相关的速度；以及根据所述速度确定所述CS个数。其中，所述速度可以包括如下信息的其中之一或任意组合：所述发送端的移动速度，所述接收端的移动速度，以及所述发送端和所述接收端之间的相对速度。
例如，发送端可以直接通过自身的仪表(例如速度传感器)获得该发送端的移动速度。对应的接收端的速度可以由发送端的服务基站指示(例如发送端和接收端处于同一小区)或者转发(例如发送端和接收端处于不同小区)。如果发送端装有雷达装置，那么可以通过雷达装置计算出对应的接收端的速度。此外，发送端还可以计算与对应的接收端之间的相对速度。
在本实施方式中，发送端可以在所述速度小于第二预设阈值的情况下，将CS个数确定为N3；在所述速度大于或等于所述第二预设阈值的情况下，将CS个数确定为大于所述N3的N4。
例如，速度向量v＝[vtx，vrx，vrelative]，其中vtx为所述发送端的移动速度，vrx为所述接收端的移动速度，vrelative为所述相对速度。发送端可以决定所使用的CS个数，也即分集增益的阶数。
该过程可以表示为所述速度向量的单调增函数
Figure PCTCN2015090521-appb-000005
例如，
Figure PCTCN2015090521-appb-000006
其中，
Figure PCTCN2015090521-appb-000007
分别为发送端以低速和高速行驶时的CS个数，N3＜N4；阈值vthreshold用于简单地划分低速行驶和高速行驶。CS个数M可以被确定为g(v)。但本发明不限于此，例如可以划分更多的速度等级，还可以考虑vrx和/或vrelative与阈值比较的情况。
由此，在速度(所述发送端的移动速度，或者所述接收端的移动速度，或者相对速度)越高的情况下可以将CS个数确定的越大，由此可以提高通信链路的可靠性。值得注意的是，上式(2)仅是本发明的一个具体例子，但本发明并不限于此，例如还可以采用不同于式(2)的其他准则，根据用户设备的速度确定CS个数。
在另一个实施方式中，还可以根据基站的配置信息确定CS个数。即获取基站配置的预设数目；根据所述预设数目确定所述循环移位个数。
在本实施方式中，所述基站可以为一个或多个组用户设备配置预设数目，并且处于相同组的用户设备被分配相同的预设数目，以及处于不同组的用户设备被配置不同的预设数目。
此外，发送端可以直接使用由服务基站配置的预设数目，将该预设数目确定为CS个数；或者还可以对该预设数目进行适当变换之后确定为CS个数。该预设数目可由服务基站通过高层信令配置，例如无线资源控制(RRC，Radio Resource Control)信令。
以上对如何确定CS个数进行了示意性说明。值得注意的是，上述3种实施方式可以分别单独使用，也可以任意组合起来使用。此外，本发明并不限于上述实施方式，还可以根据实际情况确定CS个数。
在确定CS个数M之后，发送端可以根据CS个数产生M个CS值。其中发送端已经被预先配置有包括多个(例如N个，N大于M)CS值的CS资源池；该CS资源池可以预先被定义，也可以由基站预先配置。
在一个实施方式中，可以采用映射选择法，利用链路标识计算用于选择CS值的选择索引信息，使得每个被选择出的CS值与链路标识相关。
在本实施方式中，发送端可以根据边链路同步标识和/或边链路组目的标识生成M个选择索引；根据所述M个选择索引从CS资源池中选择出所述M个CS值。
例如，每个CS值都是边链路同步标识
Figure PCTCN2015090521-appb-000008
和/或边链路组目的标识
Figure PCTCN2015090521-appb-000009
的函数，也即
Figure PCTCN2015090521-appb-000010
C为所述CS资源池，hm()为所述函数。
在另一个实施方式中，可以采用随机选择法，从CS资源池中随机选择出所述M个CS值。
例如，发送端从CS资源池中等概率地随机选择出M个CS值，
也即
Figure PCTCN2015090521-appb-000011
C为所述CS资源池。
在另一个实施方式中，还可以采用感知的随机选择法，从部分资源中选择M个CS值以避免或减少CS值的碰撞。
在本实施方式中，发送端可以根据对周围用户设备的参考信号的检测获得所述周围用户设备的CS值；确定在CS资源池中去除所述周围用户设备的CS值后的剩余资源；以及从所述剩余资源中随机选择出所述M个CS值。
例如，发送端可以首先对周围用户设备的解调参考信号(DMRS，Demodulation Reference Signal)进行检测，从而获得周围用户设备正在使用的CS值，记为集合Cusing。为了避免或者减少与Cusing中CS值的碰撞，发送端可从两集合之差
Figure PCTCN2015090521-appb-000012
中等概率地随机选择出M个CS值，即
Figure PCTCN2015090521-appb-000013
以上对如何确定CS值进行了示意性说明。值得注意的是，本发明并不限于上述实施方式，还可以根据实际情况确定CS值。
在本实施例中，发送端可以根据M个CS值对待传输的数据以及参考信号(例如DMRS)进行基于CDD的预编码。由此，可以在循环时延域中为单数据流生成多份信号，可以提高传输链路的可靠性，并且适用于网络拓扑发生变化的场景。
基于CDD的预编码例如可以使用如下公式实现：
Figure PCTCN2015090521-appb-000014
其中，k为子载波编号；C为循环移位资源池，|C|为所述循环移位资源池的大小；M为所述循环移位个数；
Figure PCTCN2015090521-appb-000015
为M个所述循环移位值；y(0)(k)为所述待传输的数据；z(0)(k),……,z(M-1)(k)为预编码后的信号。
关于CDD的预编码还可以参考相关技术(例如3GPP Release 8)，但是与现有技术中将CDD应用于多数据流的复用不同的是，本发明将CDD应用于单数据流，使得单数据流的可靠性概率变得更大。
值得注意的是，本发明的发送端对数据和导频/参考符号(例如DMRS)都进行所述CDD的预编码。这样，接收端能够直接估计出等效信道并对数据进行解调，从而实现对接收端的完全透明。接收端不需要知道发送端所使用的CS值，不过如果接收端知道所述CS值，能够在解调时获得更好的性能。
由上述实施例可知，根据CS个数确定多个CS值；根据多个CS值对待传输的数 据以及参考信号进行基于CDD的预编码；以及将预编码后的数据以及参考信号发送给接收端。由此，不但可以在传输中不需要额外信令通知接收端而实现对接收端透明，而且可以提高通信链路的可靠性。
实施例2
本发明实施例提供一种数据传输装置，配置于发送端。本实施例与实施例1相同的内容不再赘述。
图3是本发明实施例的数据传输装置的一示意图，如图3所示，数据传输装置300包括：
个数确定单元301，确定循环移位个数M；
值确定单元302，根据所述循环移位个数确定M个循环移位值；
预编码单元303，根据所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及
发送单元304，将预编码后的所述数据以及所述参考信号发送给接收端。
值得注意的是，图3仅示意性示出了与本发明相关的各部件，关于数据传输时需要的其他部件可以参考相关技术，此处不再赘述。
图4是本发明实施例的数据传输装置的另一示意图，如图4所示，数据传输装置400包括：个数确定单元301、值确定单元302、预编码单元303以及发送单元304，如上所述。
如图4所示，所述数据传输装置400还可以包括：
第一信息获取单元401，获取周围用户设备的密度或数量；
所述个数确定单元301具体可以用于：根据所述周围用户设备的密度或数量确定所述循环移位个数。例如，所述个数确定单元301在所述周围用户设备的密度或数量小于第一预设阈值的情况下，将所述循环移位个数确定为N1；在所述周围用户设备的密度或数量大于或等于所述第一预设阈值的情况下，将所述循环移位个数确定为小于所述N1的N2。
图5是本发明实施例的数据传输装置的另一示意图，如图5所示，数据传输装置500包括：个数确定单元301、值确定单元302、预编码单元303以及发送单元304，如上所述。
如图5所示，所述数据传输装置500还可以包括：
第二信息获取单元501，获取与所述发送端和/或所述接收端相关的速度；其中，所述速度可以包括如下信息的其中之一或任意组合：所述发送端的移动速度，所述接收端的移动速度，以及所述发送端和所述接收端之间的相对速度。
所述个数确定单元301具体可以用于：根据所述速度确定所述循环移位个数。例如，所述个数确定单元301在所述速度小于第二预设阈值的情况下，将所述循环移位个数确定为N3；在所述速度大于或等于所述第二预设阈值的情况下，将所述循环移位个数确定为大于所述N3的N4。
图6是本发明实施例的数据传输装置的另一示意图，如图6所示，数据传输装置600包括：个数确定单元301、值确定单元302、预编码单元303以及发送单元304，如上所述。
如图6所示，所述数据传输装置600还可以包括：
数目接收单元601，获取基站配置的预设数目；
所述个数确定单元301具体可以用于：根据所述预设数目确定所述循环移位个数。其中，所述基站可以为一个或多个组用户设备配置所述预设数目，并且处于相同组的用户设备被分配相同的预设数目，以及处于不同组的用户设备被配置不同的预设数目。
图7是本发明实施例的值确定单元302的一示意图，如图7所示，所述值确定单元302可以包括：
索引生成单元701，根据边链路同步标识和/或边链路组目的标识生成M个选择索引；
第一选择单元702，根据所述M个选择索引从循环移位资源池中选择出所述M个循环移位值。
图8是本发明实施例的值确定单元302的另一示意图，如图8所示，所述值确定单元302可以包括：
第二选择单元801，从循环移位资源池中随机选择出所述M个循环移位值。
图9是本发明实施例的值确定单元302的另一示意图，如图9所示，所述值确定单元302可以包括：
信号检测单元901，根据对周围用户设备的参考信号的检测获得所述周围用户设 备的循环移位值；
资源确定单元902，确定在循环移位资源池中去除所述周围用户设备的循环移位值后的剩余资源；以及
第三选择单元903，从所述剩余资源中随机选择出所述M个循环移位值。
在本实施例中，所述预编码单元303可以使用如下公式：
Figure PCTCN2015090521-appb-000016
其中，k为子载波编号；C为循环移位资源池，|C|为所述循环移位资源池的大小；M为所述循环移位个数；
Figure PCTCN2015090521-appb-000017
为M个所述循环移位值；y(0)(k)为所述待传输的数据；z(0)(k),……,z(M-1)(k)为预编码后的信号。
本发明实施例还提供一种发送端，配置有如上所述的数据传输装置300。其中该发送端可以是车辆携带的用户设备，也可以行人携带的用户设备，还可以是基础设施中的基站。
图10是本发明实施例的发送端的一构成示意图。如图10所示，发送端1000可以包括：中央处理器(CPU)200和存储器210；存储器210耦合到中央处理器200。其中该存储器210可存储各种数据；此外还存储信息处理的程序，并且在中央处理器200的控制下执行该程序。
其中，数据传输装置300的功能可以被集成到中央处理器200中。中央处理器200可以被配置为实现如实施例1所述的数据传输方法。
此外，如图10所示，发送端1000还可以包括：收发机220和天线230等；其中，上述部件的功能与现有技术类似，此处不再赘述。值得注意的是，发送端1200也并不是必须要包括图10中所示的所有部件；此外，发送端1000还可以包括图10中没有示出的部件，可以参考现有技术。
由上述实施例可知，根据CS个数确定多个CS值；根据多个CS值对待传输的数据以及参考信号进行基于CDD的预编码；以及将预编码后的数据以及参考信号发送给接收端。由此，不但可以在传输中不需要额外信令通知接收端而实现对接收端透明，而且可以提高通信链路的可靠性。
实施例3
本发明实施例还提供一种通信系统，与实施例1或2相同的内容不再赘述。
图11是本发明实施例的通信系统的一示意图，如图11所示，所述通信系统1100包括：发送端1101和接收端1102。
发送端1101确定循环移位个数M并根据所述循环移位个数确定M个循环移位值；基于所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及将预编码后的所述数据以及所述参考信号发送给接收端1102；
接收端1102接收所述数据以及所述参考信号，根据所述参考信号估计出等效信道并对所述数据进行解调。
在本实施例中，所述通信系统可以为车联网通信系统；但本发明不限于此，例如也可以是其他的通信系统。
本发明实施例提供一种计算机可读程序，其中当在用户设备中执行所述程序时，所述程序使得计算机在所述用户设备中执行如实施例1所述的数据传输方法。
本发明实施例提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在用户设备中执行如实施例1所述的数据传输方法。
本发明实施例提供一种计算机可读程序，其中当在基站中执行所述程序时，所述程序使得计算机在所述基站中执行如实施例1所述的数据传输方法。
本发明实施例提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在基站中执行如实施例1所述的数据传输方法。
本发明以上的装置和方法可以由硬件实现，也可以由硬件结合软件实现。本发明涉及这样的计算机可读程序，当该程序被逻辑部件所执行时，能够使该逻辑部件实现上文所述的装置或构成部件，或使该逻辑部件实现上文所述的各种方法或步骤。本发明还涉及用于存储以上程序的存储介质，如硬盘、磁盘、光盘、DVD、flash存储器等。
针对附图中描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，可以实现为用于执行本申请所描述功能的通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件或者其任意适当组合。针对附图描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，还可以实现为计算设备的组合， 例如，DSP和微处理器的组合、多个微处理器、与DSP通信结合的一个或多个微处理器或者任何其它这种配置。
以上结合具体的实施方式对本发明进行了描述，但本领域技术人员应该清楚，这些描述都是示例性的，并不是对本发明保护范围的限制。本领域技术人员可以根据本发明的原理对本发明做出各种变型和修改，这些变型和修改也在本发明的范围内。

Claims (20)

  1. 一种数据传输装置，配置于发送端，所述数据传输装置包括：
    个数确定单元，确定循环移位个数M；
    值确定单元，根据所述循环移位个数确定M个循环移位值；
    预编码单元，根据所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及
    发送单元，将预编码后的所述数据以及所述参考信号发送给接收端。
  2. 根据权利要求1所述的数据传输装置，其中，所述数据传输装置还包括：
    第一信息获取单元，获取周围用户设备的密度或数量；
    所述个数确定单元用于：根据所述周围用户设备的密度或数量确定所述循环移位个数。
  3. 根据权利要求2所述的数据传输装置，其中，所述个数确定单元在所述周围用户设备的密度或数量小于第一预设阈值的情况下，将所述循环移位个数确定为N1；在所述周围用户设备的密度或数量大于或等于所述第一预设阈值的情况下，将所述循环移位个数确定为小于所述N1的N2。
  4. 根据权利要求1所述的数据传输装置，其中，所述数据传输装置还包括：
    第二信息获取单元，获取与所述发送端和/或所述接收端相关的速度；
    所述个数确定单元用于：根据所述速度确定所述循环移位个数。
  5. 根据权利要求4所述的数据传输装置，其中，所述速度包括如下信息的其中之一或任意组合：所述发送端的移动速度，所述接收端的移动速度，以及所述发送端和所述接收端之间的相对速度。
  6. 根据权利要求4所述的数据传输装置，其中，所述个数确定单元在所述速度小于第二预设阈值的情况下，将所述循环移位个数确定为N3；在所述速度大于或等于所述第二预设阈值的情况下，将所述循环移位个数确定为大于所述N3的N4。
  7. 根据权利要求1所述的数据传输装置，其中，所述数据传输装置还包括：
    数目接收单元，获取基站配置的预设数目；
    所述个数确定单元用于：根据所述预设数目确定所述循环移位个数。
  8. 根据权利要求7所述的数据传输装置，其中，所述基站为一个或多个组用户 设备配置所述预设数目，并且处于相同组的用户设备被分配相同的预设数目，以及处于不同组的用户设备被配置不同的预设数目。
  9. 根据权利要求1所述的数据传输装置，其中，所述值确定单元包括：
    索引生成单元，根据边链路同步标识和/或边链路组目的标识生成M个选择索引；
    第一选择单元，根据所述M个选择索引从循环移位资源池中选择出所述M个循环移位值。
  10. 根据权利要求1所述的数据传输装置，其中，所述值确定单元包括：
    第二选择单元，从循环移位资源池中随机选择出所述M个循环移位值。
  11. 根据权利要求1所述的数据传输装置，其中，所述值确定单元包括：
    信号检测单元，根据对周围用户设备的参考信号的检测获得所述周围用户设备的循环移位值；
    资源确定单元，确定在循环移位资源池中去除所述周围用户设备的循环移位值后的剩余资源；以及
    第三选择单元，从所述剩余资源中随机选择出所述M个循环移位值。
  12. 根据权利要求1所述的数据传输装置，其中，所述预编码单元使用如下公式：
    Figure PCTCN2015090521-appb-100001
    其中，k为子载波编号；C为循环移位资源池，|C|为所述循环移位资源池的大小；M为所述循环移位个数；
    Figure PCTCN2015090521-appb-100002
    为M个所述循环移位值；y(0)(k)为所述待传输的数据；z(0)(k),……,z(M-1)(k)为预编码后的信号。
  13. 一种数据传输方法，所述数据传输方法包括：
    发送端确定循环移位个数M；
    根据所述循环移位个数确定M个循环移位值；
    根据所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及
    将预编码后的所述数据以及所述参考信号发送给接收端。
  14. 根据权利要求13所述的数据传输方法，其中，发送端确定循环移位个数包括：
    获取周围用户设备的密度或数量；
    根据所述周围用户设备的密度或数量确定所述循环移位个数。
  15. 根据权利要求13所述的数据传输方法，其中，发送端确定循环移位个数包括：
    获取与所述发送端和/或所述接收端相关的速度；
    根据所述速度确定所述循环移位个数。
  16. 根据权利要求13所述的数据传输方法，其中，发送端确定循环移位个数包括：
    获取基站配置的预设数目；
    根据所述预设数目确定所述循环移位个数。
  17. 根据权利要求13所述的数据传输方法，其中，根据所述循环移位个数确定M个循环移位值包括：
    根据边链路同步标识和/或边链路组目的标识生成M个选择索引；
    根据所述M个选择索引从循环移位资源池中选择出所述M个循环移位值。
  18. 根据权利要求13所述的数据传输方法，其中，根据所述循环移位个数确定M个循环移位值包括：
    从循环移位资源池中随机选择出所述M个循环移位值。
  19. 根据权利要求13所述的数据传输方法，其中，根据所述循环移位个数确定M个循环移位值包括：
    根据对周围用户设备的参考信号的检测获得所述周围用户设备的循环移位值；
    确定在循环移位资源池中去除所述周围用户设备的循环移位值后的剩余资源；
    从所述剩余资源中随机选择出所述M个循环移位值。
  20. 一种通信系统，所述通信系统包括：
    发送端，确定循环移位个数M并根据所述循环移位个数确定M个循环移位值；基于所述M个循环移位值对待传输的数据以及参考信号进行基于循环时延分集的预编码；以及将预编码后的所述数据以及所述参考信号发送给接收端；
    接收端，接收所述数据以及所述参考信号，根据所述参考信号估计出等效信道并对所述数据进行解调。
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