WO2017148205A1 - Procédé et appareil de transmission de données - Google Patents

Procédé et appareil de transmission de données Download PDF

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Publication number
WO2017148205A1
WO2017148205A1 PCT/CN2016/111494 CN2016111494W WO2017148205A1 WO 2017148205 A1 WO2017148205 A1 WO 2017148205A1 CN 2016111494 W CN2016111494 W CN 2016111494W WO 2017148205 A1 WO2017148205 A1 WO 2017148205A1
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Prior art keywords
time slot
data transmission
shared
dedicated
data
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PCT/CN2016/111494
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English (en)
Chinese (zh)
Inventor
许文俊
赵捷
苟伟
付卓然
吴翠云
段皓
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中兴通讯股份有限公司
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Publication of WO2017148205A1 publication Critical patent/WO2017148205A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to the field of communications, and in particular to a data transmission method and apparatus.
  • Device-to-device (D2D) communication is a direct-to-end communication method for close-range users. Direct communication between devices does not pass through the base station, which reduces the cost and delay of network transmission. Improve the efficiency of data transmission. With the development of multimedia technology and interactive technology, more and more services require low-latency, high-speed data interaction between devices, such as multimedia big data transmission between users, and instant interactive interactive games. In this environment, the D2D communication method has the unique advantage that the data is directly exchanged between users without passing through the base station, and the base station only needs macro control device communication.
  • a device and method capable of implementing device-to-device (D2D) communication in a cellular network a transmission method and a communication device; a method and device for D2D communication; a method for directly connecting a terminal, a terminal through terminal, and a base station, etc. It is the transmission of D2D communication on the licensed frequency band.
  • D2D device-to-device
  • FIG. 1 is a schematic diagram of an application scenario in the related art.
  • the embodiment includes the following steps:
  • Step 1 The eNB allocates frame resources.
  • the eNB determines a frame resource that can be used for D2D communication, and configures a D2D area, and the eNB further allocates a D2D discovery area in the D2D area;
  • Step 2 The eNB notifies the UE of the D2D area configuration.
  • the D2D service can be transmitted in the resource block reserved by the D2D service or on the same resource block as the traditional LTE resource.
  • the corresponding frame structure is shown in FIG. 2, and FIG. 2 is a schematic diagram of a frame structure in the related art.
  • D2D communication is still likely to compete with a large number of other LTE services, resulting in a decline in resource utilization.
  • the method avoids interference to existing network terminals by multiplexing the D2D communication to the uplink spectrum resource of the Long-Term Evolution Advance (LTE-A) (ie, the UE-to-eNB link).
  • LTE-A Long-Term Evolution Advance
  • the communication method for D2D is to carry control information and data information to be transmitted in a physical resource block, and to transmit the physical resource block to the target user by D2D communication between devices.
  • the embodiment includes the following steps:
  • Step1 Carry the control information and data information that need to be sent in the physical resource block.
  • the physical resource block includes M orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and the frequency domain includes N subcarriers, one OFDM symbol and one subcarrier defined time.
  • the frequency resource is a Resource Element (RE), where M and N are integers;
  • the control information includes a Modulation and Coding Scheme (MCS), a Redundancy Version (RV), and At least one of New Data Indication (NDI) is mapped to a high frequency portion of the physical resource block; the data information is mapped to a blank RE other than the RE of the control information mapping;
  • FIG. 3 is a schematic diagram of physical resource configuration in the second technique.
  • the physical resource block includes M orthogonal frequency division multiplexing OFDM symbols in a time domain, and includes N subcarriers in a frequency domain, and a time frequency resource defined by one OFDM symbol and one subcarrier is represented as a resource unit RE.
  • M and N are integers
  • the control information includes at least one of a channel quality indicator CQI and a precoding matrix indicator PMI, the control information is mapped on the RE of the high frequency part of the physical resource block, and the data information is mapped in the physical resource block.
  • the specific mapping may refer to FIG. 4, which is a schematic diagram 2 of the physical resource configuration in the related art 2.
  • Step 2 Send a physical resource block to the target user equipment in the inter-device D2D communication link.
  • the resource configuration method in the embodiment of the related art 2 can also be used only for the licensed frequency band, and cannot be used for the unlicensed frequency band.
  • the present invention provides a data transmission method and apparatus to solve at least the problem of D2D communication that cannot be utilized in an unlicensed frequency band in the related art.
  • a data transmission method including: determining a base station a dedicated time slot on the assigned unlicensed carrier and a shared time slot on the unlicensed carrier, wherein the dedicated time slot is used by the user equipment UE for device to device D2D data transmission, the shared time slot being used for The D2D data transmission is performed by two or more UEs, including the UE, and the D2D data transmission is performed by using the dedicated time slot and the shared time slot.
  • determining the dedicated time slot on the unlicensed carrier allocated by the base station and the shared time slot on the unlicensed carrier include: sending a request message requesting uplink scheduling to the base station; Determining an uplink resource allocated by the base station according to the request message; transmitting, by using the uplink resource, control information for controlling the D2D data transmission to the base station; and determining, by the base station, according to the control information Dedicated time slot and the shared time slot.
  • the D2D TR is a D2D data transmission report instruction determined according to an expandable field reserved by a logical channel identifier LCID in an uplink shared channel UL-SCH, where the report instruction includes a data type, a priority, and a sender number. , Receiver number, data, and loop check digit.
  • performing the D2D data transmission by using the dedicated time slot and the shared time slot comprises: transmitting the D2D data by using the dedicated time slot; and not transmitting the D2D data when using the dedicated time slot And transmitting the remaining untransmitted D2D data by using the shared time slot.
  • transmitting the D2D data by using the dedicated time slot comprises: performing idle channel estimation CCA detection on the dedicated time slot; and using the dedicated time slot when the detection result is that the dedicated time slot is idle Transmitting the D2D data.
  • transmitting the remaining untransmitted D2D data by using the shared time slot comprises: performing idle channel estimation CCA detection on the shared time slot; and when the detection result is that the shared time slot is idle, Transmitting the remaining untransmitted D2D data by using the shared time slot; when the detection result is that the shared time slot is busy, waiting for a predetermined time, performing CCA detection again, and detecting that the shared time slot is When idle, use the shared time slot to transmit the remaining The D2D data that has not been transmitted.
  • the smallest unit of the communication frame in which the dedicated time slot and/or the shared time slot is located is a small resource block MRB, where one MRB includes 14 orthogonal frequency division multiplexing OFDM symbols in the time domain,
  • the time domain size is two time slots; there are 12 consecutive subcarriers in the frequency domain, and the frequency domain size is 180 kHz.
  • a data transmission method comprising: allocating a dedicated time slot on an unlicensed carrier and a shared time slot on the unlicensed carrier, wherein the dedicated time slot is for a user equipment Performing, by the UE, device-to-device D2D data transmission, where the shared time slot is used for performing two D2D data transmissions by two or more UEs including the UE; and notifying the dedicated time slot and the shared time slot to the UE.
  • allocating the dedicated time slot on the unlicensed carrier and the shared time slot on the unlicensed carrier include: receiving a request message sent by the UE for uplink scheduling; according to the request Transmitting an uplink resource to the UE and notifying the allocated uplink resource to the UE; receiving, by the UE, control information, used by the uplink resource, to control the D2D data transmission; and allocating the dedicated according to the control information A time slot and the shared time slot.
  • receiving, by the UE, the control information that is used by the UE to control the D2D data transmission by using the uplink resource includes: receiving, by using the uplink resource, the device to transmit a report by using a device to device transmission report D2D TR.
  • the control information wherein the D2D TR is a D2D data transmission report instruction determined according to an expandable field reserved by a logical channel identifier LCID in an uplink shared channel UL-SCH, where the report instruction includes a data type, a priority, and a sender number. , Receiver number, data, and loop check digit.
  • allocating the dedicated time slot and the shared time slot according to the control information includes: performing idle channel estimation CCA detection on the unlicensed carrier; after detecting that the unlicensed carrier is idle, according to the The control information allocates the dedicated time slot and the shared time slot.
  • the method further includes: on the shared time slot Performing a clear channel assessment CCA detection; retrieving the allocated dedicated time slot and the shared time slot when detecting that the shared time slot is idle for a continuous time length greater than a duration for the UE to perform the D2D data transmission .
  • the smallest unit of the communication frame in which the dedicated time slot and/or the shared time slot is located is a small resource block MRB, where one MRB includes 14 orthogonal frequency division multiplexing OFDM symbols in the time domain,
  • the time domain size is two time slots; there are 12 consecutive subcarriers in the frequency domain, and the frequency domain size is 180 kHz.
  • a data transmission apparatus comprising: a determining module configured to determine a dedicated time slot on an unlicensed carrier allocated by a base station and a shared time slot on the unlicensed carrier, wherein The dedicated time slot is used by the user equipment UE to perform device-to-device D2D data transmission, and the shared time slot is used for two or more UEs including the UE to perform the D2D data transmission; and the transmission module is configured to use the The D2D data transmission is performed by a dedicated time slot and the shared time slot.
  • a data transmission apparatus comprising: an allocation module configured to allocate a dedicated time slot on an unlicensed carrier and a shared time slot on the unlicensed carrier, wherein the dedicated time slot The slot is used for user equipment UE to perform device-to-device D2D data transmission, the shared time slot is used for two D2D data transmissions by the two or more UEs including the UE, and the notification module is configured to set the dedicated time slot Notifying the UE with the shared time slot.
  • Another embodiment of the present invention provides a computer storage medium, where the computer storage medium stores execution instructions for performing one or a combination of the steps in the foregoing method embodiments.
  • a dedicated time slot on an unlicensed carrier allocated by a base station and a shared time slot on the unlicensed carrier are used, wherein the dedicated time slot is used for user equipment UE to perform device-to-device D2D data transmission.
  • the shared time slot is used for two D2D data transmissions by two or more UEs including the UE; and the D2D data transmission is performed by using the dedicated time slot and the shared time slot.
  • FIG. 1 is a schematic diagram of an application scenario in the related art 1;
  • FIG. 2 is a schematic diagram of a frame structure in the related art 1;
  • 3 is a schematic diagram 1 of physical resource configuration in related art 2;
  • FIG. 5 is a flowchart of a first data transmission method according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of a second data transmission method according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an LAA scenario according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a D2D data transmission report instruction according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of channel resource configuration according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a corresponding frame structure in the case of an LBE according to the first solution in the embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a corresponding frame in the case of FBE according to the first embodiment of the present invention.
  • FIG. 13 is a schematic diagram of a corresponding frame structure in the case of an LBE of the second solution according to the embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of a corresponding frame in the case of FBE according to the second embodiment of the present invention.
  • 16 is a comparison diagram of throughput in different channel access modes according to an embodiment of the present invention.
  • 17 is a schematic diagram of comparison of two communication frames in the case of LBE according to an embodiment of the present invention.
  • FIG. 18 is a schematic diagram of a dedicated time slot and a shared time slot according to an embodiment of the present invention.
  • FIG. 19 is a block diagram showing the structure of a first data transmission apparatus according to an embodiment of the present invention.
  • 20 is a block diagram showing the structure of a second type of data transmission apparatus according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a first data transmission method according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps:
  • Step S502 determining a dedicated time slot on the unlicensed carrier allocated by the base station and a shared time slot on the unlicensed carrier, where the dedicated time slot is used by the user equipment UE to perform device-to-device D2D data transmission, where the shared time slot is used.
  • Step S504 performing D2D data transmission by using the dedicated time slot and the shared time slot.
  • the above operation may be performed by the UE.
  • the UE may determine a dedicated time slot and a shared time slot on the unlicensed carrier allocated by the base station, where the dedicated time slot is a time slot exclusively used by the UE, and the shared time slot may be competed by multiple UEs.
  • the used time slot is used, and the determined dedicated time slot and the shared time slot can be utilized (if the dedicated time slot can transmit the D2D data of the UE, the dedicated time slot can be used for D2D data transmission) for D2D data transmission. Therefore, the purpose of performing D2D communication by using an unlicensed carrier is achieved, and the problem that the D2D communication cannot be performed by using the unlicensed frequency band in the related art is solved, thereby achieving D2D communication by using the unlicensed frequency band. Letter, improve the effect of resource utilization.
  • determining the dedicated time slot on the unlicensed carrier allocated by the base station and the shared time slot on the unlicensed carrier includes: sending a request message requesting uplink scheduling to the base station; determining, according to the request message, the base station according to the request message And the allocated uplink resource; the control information used for controlling the D2D data transmission is sent to the base station by using the uplink resource; and the dedicated time slot and the shared time slot allocated by the base station according to the control information are determined.
  • the foregoing control information may include at least one of the following: a data source device identifier (ID), a data destination device ID, a service type, a data volume, and a priority.
  • the foregoing request message may be reported by using a scheduling request (Scheduling Request, abbreviated as SR) resource, where the SR resource may be a resource allocated by the base station and dedicated to the UE.
  • SR scheduling request
  • the above SR resources and uplink resources may both be resources on the licensed carrier.
  • transmitting the control information for controlling D2D data transmission to the base station by using the uplink resource includes: using the uplink resource to perform the foregoing control by using a D2D Transmission Report (D2D TR)
  • D2D TR is a D2D data transmission determined according to an expandable field reserved by a logical channel identifier (LCID) in an Uplink-Shared Channel (UL-SCH).
  • Reports instructions that include data type, priority, sender number, receiver number, data, and loop check bits.
  • the D2D TR can be reported by the MAC Control Element of the Medium Access Control (MAC) layer.
  • MAC Medium Access Control
  • performing D2D data transmission by using the dedicated time slot and the shared time slot includes: transmitting D2D data by using the dedicated time slot; and utilizing the shared time slot when the D2D data is not transmitted by using the dedicated time slot. Transfer the remaining untransferred D2D data.
  • the D2D data transmission can be completed by using the dedicated time slot and the shared time slot, but it should be noted that if the transmission of the D2D data can be completed only by using the dedicated time slot, only the dedicated time slot can be utilized. The transmission of D2D data is performed without using the shared time slot for the transmission of D2D data.
  • transmitting the D2D data by using the dedicated time slot includes: performing Clear Channel Assessment (CCA) detection on the dedicated time slot; and detecting that the dedicated time slot is idle.
  • CCA Clear Channel Assessment
  • D2D data is transmitted using a dedicated time slot.
  • the purpose of the CCA detection by the UE is to re-confirm that the dedicated time slot is not occupied, so as to ensure that the D2D data is successfully transmitted.
  • the UE may not perform CCA detection on the dedicated time slot. It is determined according to the actual situation whether the UE performs CCA detection.
  • transmitting the remaining untransmitted D2D data by using the shared time slot includes: performing idle channel estimation CCA detection on the shared time slot; and when the detection result is that the shared time slot is idle And transmitting the remaining untransmitted D2D data by using the shared time slot; when the detection result is that the shared time slot is busy, waiting for a predetermined time, performing CCA detection again, and detecting that the shared time slot is idle, utilizing The shared time slot transmits the remaining untransmitted D2D data.
  • the foregoing predetermined time may be determined according to a backoff algorithm. The backoff algorithm is described below: when starting the backoff process, the corresponding UE sets a backoff timer to a random backoff time, and a backoff time.
  • Random() is a random function, the generated random numbers are evenly distributed in [0, 1]; Slot Time is the basic delay unit determined by the system; CW is the contention window size, determined by the number of shared time slots.
  • the backoff timer stops counting, and the current value (ie, the remaining time in the backoff timer) is taken as the delay time of the next backoff; if the channel is detected to be idle, the backoff timer Start the decrement calculation.
  • the communication node will send the frame.
  • the backoff value (corresponding to the current value described above) of the smallest UE will gain access to the channel.
  • the minimum unit of the communication frame in which the dedicated time slot and/or the shared time slot is located is a Mini Resource Block (MRB), wherein one MRB may be included in the time domain. 14 orthogonal frequency division multiplexing OFDM symbols, the time domain size is two time slots (ie, 1 ms); 12 consecutive subcarriers are included in the frequency domain, and the frequency domain size is 180 kHz.
  • MRB Mini Resource Block
  • the minimum unit of the communication length in the communication frame is divided into MRB, which can implement double multiplexing in the time domain and the frequency domain; and, the communication time in the communication frame is divided into the shared time slot and the dedicated time.
  • the base station can perform different ratios for the shared time slot and the dedicated time slot according to the reporting requirement, and schedule the dedicated time slot; the data interaction that the UE does not complete in the dedicated time slot will be transferred to the shared time slot, thereby greatly improving resources. Utilization rate.
  • FIG. 6 is a flowchart of a second data transmission method according to an embodiment of the present invention. As shown in FIG. 6, the process includes the following steps:
  • Step S602 allocating a dedicated time slot on the unlicensed carrier and a shared time slot on the unlicensed carrier, where the dedicated time slot is used for user equipment UE to perform device to device D2D data transmission, and the shared time slot is used to include the foregoing D2D data transmission by two or more UEs including UE;
  • Step S604 notifying the UE of the dedicated time slot and the shared time slot.
  • the foregoing operation may be performed by the base station.
  • the UE may perform D2D data transmission by using the dedicated time slot and the shared time slot.
  • the base station allocates dedicated time slots and shared time slots for data transmission by the UE on the unlicensed carrier, wherein the dedicated time slot is a time slot exclusively used by the UE, and the shared time slot can be multi-
  • the D2D data transmission is carried out, thereby realizing the purpose of performing D2D communication by using an unlicensed carrier, and solving the problem that the D2D communication cannot be performed by using the unlicensed frequency band in the related art, thereby achieving D2D communication by using the unlicensed frequency band, thereby improving resources.
  • the effect of utilization is carried out, thereby realizing the purpose of performing D2D communication by using an unlicensed carrier, and solving the problem that the D2D communication cannot be performed by using the unlicensed frequency band in the related art, thereby achieving D2D communication by using the unlicensed frequency band, thereby improving resources.
  • allocating the dedicated time slot on the unlicensed carrier and the shared time slot on the unlicensed carrier includes: receiving a request message sent by the UE for uplink scheduling; and allocating the uplink resource according to the request message;
  • the allocated uplink resource is notified to the UE; the control information that is sent by the UE by using the foregoing uplink resource for controlling D2D data transmission is received; and the dedicated time slot and the shared time slot are allocated according to the foregoing control information.
  • the foregoing control information may include at least one of the following: a data source device ID, a data destination device ID, a service type, a data amount, and a priority.
  • the foregoing request message may be reported by using an SR resource, where the SR resource may be a base. Station-allocated and UE-specific resources.
  • the above SR resources and uplink resources may both be resources on the licensed carrier.
  • the receiving, by the UE, the control information for controlling the D2D data transmission by using the uplink resource includes: receiving, by using the foregoing uplink resource, control information sent by the device-to-device transmission report D2D TR, where
  • the D2D TR is a D2D data transmission report instruction determined according to an extensible field reserved by a logical channel identifier LCID in the uplink shared channel UL-SCH, where the report instruction includes a data type, a priority, a sender number, a receiver number, a data, and a cyclic school. Check position.
  • the D2D TR can be reported through the MAC Control Element of the MAC layer.
  • allocating the dedicated time slot and the shared time slot according to the foregoing control information includes: performing idle channel estimation CCA detection on the unlicensed carrier; and after detecting that the unlicensed carrier is idle, according to the foregoing control information A dedicated time slot and a shared time slot are allocated.
  • the base station can perform multiple CCA (ie, ECCA) detections.
  • the method further includes: performing idle channel estimation CCA detection on the shared time slot; and detecting that the shared time slot idle time length is greater than a duration for the UE to perform D2D data transmission, reclaiming the allocated The above dedicated time slot and shared time slot.
  • the base station may select to reclaim the channel, thereby performing the next round of data transmission.
  • the minimum unit of the communication frame in which the dedicated time slot and/or the shared time slot is located is a small resource block MRB, wherein one MRB includes 14 orthogonal frequency division multiplexing OFDM in the time domain.
  • the time domain size is two time slots; contains 12 consecutive subcarriers in the frequency domain, and the frequency domain size is 180 kHz.
  • the present invention proposes to face D2D.
  • the frame structure of the communication improves the shortage of the existing solution, alleviates the problem of high load of the LTE base station, further reduces the delay of data transmission, and improves the user experience. Therefore, the embodiments of the present invention focus on the frame structure design of the D2D communication in the unlicensed frequency band, and consider resources of the same system (such as LTE-U (LTE-Unlicensed)) and between different systems (Wi-Fi and LTE-U). Competing problems and solving related technical problems:
  • the D2D UE When the D2D UE has a transmission request, the transmission request is reported to the base station, and when the base station detects the idle channel, the UE can control the D2D data transmission, which saves the time for the UE to parse the downlink notification signal.
  • Different D2D UEs use the unlicensed frequency band for related transmission according to the arbitration result of the base station.
  • the minimum unit of communication length of the D2D communication frame is MRB, and the base station performs scheduling in units of MRB according to the service and data amount reported by the D2D user.
  • the communication length of the D2D communication frame is divided into a dedicated slot (shared slot) and a shared slot (shared slot).
  • the communication resources corresponding to the dedicated slot are scheduled by the base station, and the communication resources of the shared slot are randomly competitively repelled. Mode access, reducing the possibility of collisions between different D2D UEs.
  • a frame structure and a resource configuration method for high resource utilization for D2D data interaction are proposed.
  • LBE Load Based Equipment
  • the allocation strategy of dividing resources in the time domain and frequency domain two-dimensional space by macro control of the base station is completed in the unlicensed frequency band.
  • the specific resource allocation method is determined by the data volume and service type of the D2D UE.
  • Embodiments of the present invention can be divided into two parts: a D2D UE and base station data interaction embodiment and a frame structure based transmission embodiment.
  • the embodiment of the present invention is mainly directed to the communication between the D2D UEs on the unlicensed frequency band in the LAA scenario as shown in FIG. 7, wherein FIG. 7 is a schematic diagram of the LAA scenario according to the embodiment of the present invention. Figure.
  • the base station is still required to perform overall scheduling and arbitration, and the scheduling and control process can be performed in the licensed frequency band.
  • the D2D UE When the D2D UE generates a data transmission request, the D2D UE first needs to send its own resource scheduling request required for data transmission to the base station, and then the base station arbitrates according to the obtained information to allocate resources for the UE. Specifically, the following steps are included:
  • Step 1 the base station reports the data transmission request: the D2D UE informs the base station that the uplink scheduling request is to be transmitted by the SR on the uplink control channel (PUCCH), and requests the eNodeB (referred to as eNB, corresponding to the above base station).
  • the uplink resource is allocated to the UE.
  • the SR resource is UE-specific and allocated by the eNB. For the specific sending process of the SR, refer to the protocol 3GPP TR 36.213.
  • the corresponding UE reports the data transmission control information, such as the data source device ID, the data destination device ID, the service type, the data volume, and the priority, to the base station through the D2D TR on the uplink resource allocated by the base station.
  • the D2D TR is a D2D data transmission report instruction designed according to the scalable field reserved by the LCID in the current UL-SCH, and the D2D TR is reported by the MAC Control Element of the MAC layer.
  • FIG. 8 is a schematic diagram of the D2D data transmission report instruction according to an embodiment of the present invention.
  • Step 2 The base station arbitrates the allocated resources: when the base station detects that the unlicensed frequency band is idle, the base station performs arbitration according to the report result of the D2D UE (that is, the control information reported by the D2D UE), and sends the arbitration result to each D2D UE.
  • the time slot on the unlicensed frequency band is divided into two types: a dedicated time slot and a shared time slot.
  • the base station determines the ratio of the dedicated time slot and the shared time slot according to the information reported by the UE, and the base station only announces the arbitration result of the dedicated time slot.
  • each D2D device competes for access by means of backoff.
  • the purpose of the CCA to detect the idle channel is to facilitate the control and facilitate the traffic monitoring and charging of the operator.
  • the carrier sense mode is generally adopted, and the corresponding frame structure is embodied in the actual data transmission.
  • the corresponding frame structure is embodied in the actual data transmission.
  • CCA free channel evaluation
  • the embodiments of the present invention aim to design a suitable channel access mode and improve resource utilization.
  • two channel access schemes are proposed:
  • Option 1 includes the following steps:
  • Step 1 According to the arbitration result of the base station, the D2D UE first performs data interaction on the dedicated time slot. If the data interaction is not completed within the resources allocated by the base station, the shared time slot is entered again to compete for the channel to complete the remaining data interaction. In order to ensure the holding of the channel, CCA energy detection is performed before each data interaction.
  • FIG. 9 is a schematic diagram of channel resource configuration according to an embodiment of the present invention.
  • Step 2 In the shared time slot, the time length of the energy detected after n consecutive CCAs is less than the threshold exceeds the detection time of the communication, and the base station considers that the channel is occupied, the data has been completed, and the base station may choose to reclaim the channel. A round of data transmission.
  • the frame length is not fixed.
  • the LAA base station uses multiple CCAs, that is, ECCA, to detect. When the length of time when the energy is less than the threshold is detected, the base station considers that the channel is available. Frame-initiated data transmission is different from the FBE structure in that the frame structure cannot be aligned with the frame structure of LTE due to multiple CCA detections, and the LAA base station needs to transmit a Preamble signal.
  • FIG. 10 is a schematic diagram of a corresponding frame structure in the case of an LBE according to the first embodiment of the present invention
  • FIG. 11 is a schematic diagram of a corresponding frame structure in the case of the FBE according to the first embodiment of the present invention.
  • FIG. 12 is a flowchart 1 of data transmission according to an embodiment of the present invention, and the process includes the following steps:
  • Step S1202 The D2D UE reports a data transmission request to the base station by using the SR.
  • Step S1204 The base station performs CCA detection to determine whether the channel is idle. If the determination result is yes, the process goes to step S1206. Otherwise, the CCA detection is continued.
  • Step S1206 The arbitration result of the dedicated time slot is delivered according to the report result of the D2D UE;
  • Step S1208 The D2D UE performs transmission in a dedicated time slot according to the arbitration result.
  • step S1210 it is determined whether there is redundant data that has not been completed. If the determination result is yes, the process goes to step S1212, otherwise, the process ends.
  • step S1212 the data interaction is completed by using the shared time slot.
  • Step 1 The D2D UEs all access the channel in a competitive manner. Since all accesses in a competitive manner, the base station is not required to arbitrate according to the reported result. Before transmitting the data, the D2D UE first detects whether the channel is occupied. If the channel is detected to be idle, the channel is occupied for transmission; if the channel is detected to be busy, a random backoff algorithm is adopted, and after waiting for a period of time, it is detected again whether the channel is idle.
  • Step 2 When starting the backoff process, the corresponding node sets a backoff timer to the backoff timer, and the backoff time.
  • Random() random function the generated random number is evenly distributed in [0,1];
  • SlotTime is the basic delay unit determined by the system;
  • CW is the contention window size, shared time slot (can be considered as all on the unlicensed carrier) The number of time slots are all shared time slots).
  • the backoff timer stops counting, and the current value (ie, the remaining time of the backoff timer) is taken as the delay time of the next backoff; if the channel is detected to be idle, the backoff timer is started. Decrement calculation.
  • the communication node will send the frame.
  • the backoff value (corresponding to the current value described above) is the smallest and access to the channel will be obtained.
  • FIG. 13 is a schematic diagram of a corresponding frame structure in the case of an LBE according to the second embodiment of the present invention
  • FIG. 14 is a schematic diagram of a corresponding frame structure in the case of the FBE according to the second embodiment of the present invention.
  • FIG. 15 is a second flowchart of data transmission according to an embodiment of the present invention, and the process includes the following steps:
  • Step S1502 the D2D UE has a data transmission requirement
  • Step S1504 The D2D UE performs CCA detection on the channel.
  • Step S1506 determining whether the channel is idle, if idle, go to step S1518, otherwise, go to step S1508;
  • Step S1508 entering a random backoff mechanism (using a backoff algorithm).
  • Step S1510 generating a backoff time T
  • Step S1512 determining whether the channel is idle, if idle, go to step S1214, otherwise, go to step S1216;
  • step S1514 the backoff time is decremented
  • Step S1516 it is determined whether the backoff time is decremented to 0, if decremented to 0, then go to step S1218, otherwise, go to step S1212;
  • step S1518 the D2D UE completes the data interaction.
  • FIG. 16 is a comparison diagram of throughputs in different channel access modes according to an embodiment of the present invention. As can be seen from FIG. 16, as the traffic volume increases, the proportion of dedicated time slots can be reasonably configured. The corresponding throughput is greater than the throughput corresponding to the second scheme.
  • the notification signal is broadcasted to the D2D UE that needs to communicate, and then the D2D device reports information such as the ID, the amount of service data, and the priority to the base station, and the base station re- Arbitration, which requires the length of the communication frame.
  • the D2D UE may periodically transmit the data transmission requirement to the base station, and the base station performs arbitration according to the reporting situation, and performs signal analysis in the licensed frequency band.
  • the base station detects that the channel is idle, the user may be in the unlicensed frequency band. Perform D2D data interaction. And in order to confirm the band holding, the D2D UE has to perform another CCA test before the data transmission.
  • 17 is a diagram showing a comparison of two communication frames in the case of an LBE according to an embodiment of the present invention.
  • the invention divides the communication duration into dedicated time slots and shared time slots, thereby improving resource utilization.
  • the base station can flexibly match the dedicated time slot and the shared time slot according to the transmission requirement, and only announce the arbitration result for the dedicated time slot, and if there is redundant data interaction, it will be transferred to the shared time slot. Avoid the way to access.
  • the base station In the shared time slot, if idle is detected after performing several CCAs, the base station has the right to reclaim the channel for data transmission of other D2D UEs. If there is no new transmission requirement at this time, the channel can be used for other technologies (such as Wi-Fi), which can avoid unnecessary waste of resources.
  • 18 is a schematic diagram of a dedicated time slot and a shared time slot in accordance with an embodiment of the present invention.
  • the communication frame designed in the embodiment of the present invention divides the minimum unit of the communication length into MRB, and one MRB includes 14 OFDM symbols in the time domain, the time domain size is two time slots, that is, 1 ms; and the frequency domain includes 12
  • the continuous subcarrier has a frequency domain size of 180 kHz. If one symbol *1 subcarrier is defined as one resource element (Resource Element, RE), one MRB contains 14 ⁇ 12 REs.
  • the base station performs scheduling allocation on the MRB according to the traffic volume and priority of the D2D, realizes two-dimensional multiplexing in the time domain frequency domain, and improves resource utilization.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • a data transmission device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 19 is a block diagram showing the structure of a first data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 19, the apparatus includes a determination module 192 and a transmission module 194, which will be described below.
  • Determining module 192 configured to determine a dedicated time slot and on the unlicensed carrier allocated by the base station a shared time slot on the unlicensed carrier, where the dedicated time slot is used for user equipment UE to perform device to device D2D data transmission, and the shared time slot is used for D2D data transmission by two or more UEs including the foregoing UE;
  • the transmission module 194 is coupled to the determining module 192 and configured to perform D2D data transmission by using the dedicated time slot and the shared time slot.
  • the determining module 192 may determine the dedicated time slot on the unlicensed carrier allocated by the base station and the shared time slot on the unlicensed carrier by sending a request message requesting uplink scheduling to the base station; Determining an uplink resource allocated by the base station according to the request message; transmitting, by using the uplink resource, control information for controlling D2D data transmission to the base station; determining a dedicated time slot and a shared time slot allocated by the base station according to the control information.
  • the determining module 192 may send, by using an uplink resource, control information for controlling D2D data transmission to the base station by using the uplink resource to send the control information to the device by using the device-to-device transmission report D2D TR.
  • the D2D TR is a D2D data transmission report instruction determined according to an expandable field reserved by a logical channel identifier LCID in an uplink shared channel UL-SCH, where the report instruction includes a data type, a priority, a sender number, and a receiver number. , data and loop check digits.
  • the foregoing transmission module 194 can perform D2D data transmission by using a dedicated time slot and a shared time slot by: transmitting D2D data by using the dedicated time slot; and not transmitting D2D data when using the dedicated time slot. At the time, the remaining untransmitted D2D data is transmitted using the shared time slot described above.
  • the foregoing transmission module 194 may transmit the D2D data by using a dedicated time slot by performing idle channel estimation CCA detection on a dedicated time slot; and when the detection result is that the dedicated time slot is idle, utilizing The dedicated time slot transmits D2D data.
  • the foregoing transmission module 194 may transmit the remaining untransmitted D2D data by using the shared time slot by: performing idle channel estimation CCA detection on the shared time slot; When the shared time slot is idle, the remaining untransmitted D2D data is transmitted by using the shared time slot; when the detection result is that the shared time slot is busy, waiting for a predetermined time, performing CCA detection again, and detecting that the shared time slot is when idle, The remaining untransmitted D2D data is transmitted using the shared time slot.
  • the minimum unit of the communication frame in which the dedicated time slot and/or the shared time slot is located is a small resource block MRB, wherein one MRB includes 14 orthogonal frequency division multiplexing OFDM in the time domain.
  • the time domain size is two time slots; contains 12 consecutive subcarriers in the frequency domain, and the frequency domain size is 180 kHz.
  • the apparatus includes an allocation module 202 and a notification module 204, which will be described below.
  • the allocating module 202 is configured to allocate a dedicated time slot on the unlicensed carrier and a shared time slot on the unlicensed carrier, where the dedicated time slot is used for the user equipment UE to perform device to device D2D data transmission, and the shared time slot is used.
  • the D2D data transmission is performed on two or more UEs including the UE, and the notification module 204 is connected to the foregoing allocation module 202, and is configured to notify the UE of the dedicated time slot and the shared time slot.
  • the foregoing allocation module 202 may allocate a dedicated time slot on the unlicensed carrier and a shared time slot on the unlicensed carrier by: receiving a request message sent by the UE for uplink scheduling; The request message allocates an uplink resource and notifies the allocated uplink resource to the UE; and receives control information for controlling the D2D data transmission sent by the UE by using the uplink resource; and allocating the dedicated time slot and the shared time slot according to the foregoing control information.
  • the foregoing allocation module 202 may receive, by using the uplink resource, the control information that is sent by the UE by using an uplink resource to control D2D data transmission: the receiving UE transmits the report through the device to the device by using the uplink resource, and the D2D TR is transmitted.
  • the transmitted control information wherein the D2D TR is a D2D data transmission report instruction determined according to an expandable field reserved by a logical channel identifier LCID in the uplink shared channel UL-SCH, where the report instruction includes a data type, a priority, a sender number, Receiver number, data, and loop check digit.
  • the foregoing allocation module 202 may allocate a dedicated time slot and a shared time slot according to the control information by performing idle channel estimation CCA detection on the unlicensed carrier, and detecting that the unlicensed carrier is idle. After that, according to the above control information distribution Use time slots and shared time slots.
  • the apparatus further includes a processing module configured to allocate a dedicated time slot on an unlicensed carrier for D2D data transmission for the UE and two or more for including the UE After the UE performs the shared time slot on the unlicensed carrier for D2D data transmission, performs idle channel estimation CCA detection on the shared time slot; when detecting that the shared time slot is idle for a continuous time length greater than that for the UE to perform D2D data transmission When the time is long, the allocated dedicated time slot and shared time slot are reclaimed.
  • the minimum unit of the communication frame in which the dedicated time slot and/or the shared time slot is located is a small resource block MRB, wherein one MRB includes 14 orthogonal frequency division multiplexing OFDM in the time domain.
  • the time domain size is two time slots; contains 12 consecutive subcarriers in the frequency domain, and the frequency domain size is 180 kHz.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the storage medium is further arranged to store program code for performing the following steps:
  • the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • the processor performs the above steps according to the stored program code in the storage medium.
  • the D2D UE reports a data request to the base station, and the base station performs arbitration according to the reported result. After the base station detects that the channel is idle, the base station can perform transmission, and does not need to occupy the communication time to resolve the scheduling instruction of the base station in the communication frame;
  • the base station may The reporting requirement performs different ratios for the shared time slot and the dedicated time slot, and schedules the dedicated time slot; the data interaction that the UE does not complete in the dedicated time slot will be transferred to the shared time slot, thereby greatly improving resource utilization.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the data transmission method and apparatus provided by the embodiments of the present invention have the following beneficial effects: solving the problem that the D2D communication cannot be performed by using the unlicensed frequency band in the related art, thereby achieving D2D communication using the unlicensed frequency band. To improve the efficiency of resource utilization.

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Abstract

L'invention concerne un procédé et un appareil de transmission de données. Le procédé comprend les étapes suivantes : déterminer un créneau dédié sur une porteuse sans licence et un créneau partagé sur la porteuse sans licence qui sont attribués par une station de base, le créneau dédié étant utilisé par un équipement utilisateur (UE) pour effectuer une transmission de données de dispositif à dispositif (D2D), et le créneau partagé étant utilisé par au moins deux UE, y compris ledit UE, pour effectuer une transmission de données D2D; et utiliser le créneau dédié et le créneau partagé pour effectuer une transmission de données D2D. Au moyen de la présente invention, le problème selon lequel, dans l'état de la technique, une bande de fréquence sans licence ne peut pas être utilisée pour effectuer une communication D2D, est résolu, ce qui permet d'obtenir l'effet d'utilisation d'une bande de fréquence sans licence pour effectuer une communication D2D de façon à améliorer le taux d'utilisation des ressources.
PCT/CN2016/111494 2016-02-29 2016-12-22 Procédé et appareil de transmission de données WO2017148205A1 (fr)

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