WO2017036342A1 - 一种发送数据包的方法及装置 - Google Patents

一种发送数据包的方法及装置 Download PDF

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Publication number
WO2017036342A1
WO2017036342A1 PCT/CN2016/096732 CN2016096732W WO2017036342A1 WO 2017036342 A1 WO2017036342 A1 WO 2017036342A1 CN 2016096732 W CN2016096732 W CN 2016096732W WO 2017036342 A1 WO2017036342 A1 WO 2017036342A1
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resource
transmission
data packet
sending
transmission resource
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PCT/CN2016/096732
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English (en)
French (fr)
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全海洋
赵亚利
张惠英
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电信科学技术研究院
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Publication of WO2017036342A1 publication Critical patent/WO2017036342A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a data packet.
  • some of the use cases require a data transmission delay of 20ms, and some are 100ms or 160ms.
  • the scheduling period of D2D communication is 40 ms. Then, even if the transmission time interval (TTI) is reduced to the current half, all the cycles are reduced to half. Considering the transmission delay, scheduling timing, etc., it is difficult to ensure that the data is sent to the pair within 20 ms. end.
  • TTI transmission time interval
  • the shortcoming of the prior art is that if the D2D technology is used for the transmission of related data, it is difficult to meet the various use case requirements of the Internet of Vehicles for the case of low latency of 20 ms.
  • the present invention provides a method and apparatus for transmitting data packets to meet the needs of various delay data transmissions in order to transmit various delay data packets to the opposite end according to the corresponding delay requirements.
  • a method for sending a data packet including:
  • the delay requirement when the data packet is sent is determined according to the cause of the data packet generation
  • a data packet is transmitted on the transmission resource.
  • the current resource situation is the case of the current resource authorization.
  • the delay requirement for determining the transmission of the data packet according to the sending indication is a low time delay:
  • the transmission resource is determined to be a transmission resource for transmitting a data packet
  • the transmission resource for broadcasting is determined as the transmission resource of the transmission data packet, and/or the latest transmission resource in the previously reserved D2D transmission resource pool is determined as Send the sending resource of the packet.
  • the latest transmission resource in the previously reserved D2D transmission resource pool is determined as the transmission resource of the transmission data packet
  • the same transmission resource is sent multiple times in succession. The same packet is sent on the packet, or on the most recent transmission resource in the previously reserved D2D transmission resource pool.
  • the sending indication indicates the delay request by the priority information.
  • the data packet when the data packet is sent to the access layer and carries the sending indication, it is carried by the inter-layer primitive or by using a preset data format.
  • An embodiment of the present invention provides an apparatus for sending a data packet, including:
  • the delay requirement module is configured to determine, when the application layer generates the data packet, a delay requirement when the data packet is sent according to the cause of the data packet;
  • An indication module configured to carry a sending indication when sending the data packet to the access layer, where the sending indication is determined according to a delay requirement
  • a resource module configured to determine, at the access layer, a sending resource for sending a data packet according to the sending indication and according to a current resource situation;
  • a sending module configured to send a data packet on the sending resource.
  • the resource module is further used in the case where the current resource situation is the current resource authorization.
  • the resource module is further configured to: when determining, according to the sending indication, that the delay requirement of the data packet transmission is low: according to the current resource authorization, when other resources are currently sent, stopping sending other data Determining the current transmission resource as the transmission resource of the transmission data packet; according to the current resource authorization, when the current resource is not currently transmitted, the transmission resource for broadcasting is determined as the transmission resource of the transmission data packet, and/or The latest transmission resource in the previously reserved D2D transmission resource pool is determined as the transmission resource of the transmission data packet.
  • the sending module is further configured to: when the latest transmission resource in the previously reserved D2D transmission resource pool is determined as the transmission resource of the transmission data packet, when the data packet is sent on the transmission resource, on the latest transmission resource The same data packet is sent multiple times in succession, or the same data packet is sent on the most recent transmission resource in a plurality of previously reserved D2D transmission resource pools.
  • the indication module is further configured to use the priority information to indicate a delay request.
  • the indication module is further configured to carry the transmission indication when carrying the data packet to the access layer, using an inter-layer primitive, or using a preset data format.
  • An embodiment of the present invention provides an apparatus for sending a data packet, including:
  • a processor for reading a program in the memory performing the following process:
  • the delay requirement when the data packet is sent is determined according to the cause of the data packet generation
  • a transceiver for transmitting data under the control of a processor performing the following processes:
  • a data packet is transmitted on the transmission resource.
  • the current resource situation is the current resource authorization situation.
  • the processor is further configured to:
  • the delay requirement for determining the transmission of the data packet according to the transmission indication is a low time delay:
  • the transmission of other data is stopped, and the current transmission resource is determined as the transmission resource of the transmission data packet;
  • the transmission resource for broadcasting is determined as the transmission resource of the transmission data packet, and/or the latest transmission resource in the previously reserved D2D transmission resource pool is determined as Send the sending resource of the packet.
  • the transceiver is further configured to:
  • the latest transmission resource in the previously reserved D2D transmission resource pool is determined as the transmission resource of the transmission data packet, when the data packet is transmitted on the transmission resource, the same data packet is continuously sent multiple times on the latest transmission resource, or The same data packet is sent on the most recent transmission resource in a plurality of previously reserved D2D transmission resource pools.
  • the transceiver is further configured to:
  • the sending indication indicates the delay request by the priority information.
  • the transceiver is further configured to:
  • the delay requirement of the data packet is determined according to the data packet generation reason when the data packet is generated, when the transmission resource is allocated for the data packet, the delay may be It is required to arrange a transmission resource suitable for the transmission, that is, to transmit the transmission delay indication information to the bottom layer, so that the bottom layer can select the transmission resource according to the delay indication information.
  • a transmission resource suitable for the transmission that is, to transmit the transmission delay indication information to the bottom layer, so that the bottom layer can select the transmission resource according to the delay indication information.
  • the solution also provides a resource allocator in determining that the delay requirement of the data packet transmission is low. case.
  • FIG. 1 is a schematic diagram of a vehicle network communication method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of D2D discovery/communication according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of transmission of SCI and data in an SCI period according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for implementing a method for transmitting a data packet according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an apparatus for transmitting a data packet according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of the vehicle network communication mode.
  • the vehicle to the outside information exchange vehicle to X, V2X
  • V2V vehicle-to-vehicle information exchange
  • V2I vehicle-to-Infrastructure
  • V2P Vehicle-to-Pedestrian
  • V2V use case and requirement defined by SA1 are shown in Table 1:
  • the existing D2D communication mechanism does not guarantee the low latency requirement, nor does it guarantee the reliability of the transmission.
  • the terminal direct-through technology refers to a way in which neighboring terminals can transmit data through a direct link in a short range without forwarding through a central node (ie, a base station) or through a traditional cellular link. Information transmission between UEs is performed.
  • the D2D proximity service includes the following two categories:
  • the UE uses E-UTRA to confirm that another UE is nearby. For example, the D2D UE can use the service to find nearby taxis, find friends nearby, and the like;
  • Figure 2 is a schematic diagram of D2D discovery/communication. As shown in the figure, UEs that are close to each other convert the communication link originally transmitted through the network into local direct communication by directly establishing a link between the two UEs. Link, It saves a lot of bandwidth and network efficiency; or two UEs that are close to each other can use direct link communication to obtain stable high-speed and low-cost communication services.
  • the proximity service communication is generally performed under the control or assistance of the network side, and the evolved Node Base Station (eNB) may even dynamically allocate resources for the UE performing the proximity service communication.
  • eNB evolved Node Base Station
  • D2D link A link that directly communicates between a device and a device
  • D2N link A link that communicates between a device and a network node.
  • UEs participating in D2D discovery/communication are divided into two roles:
  • D2D transmitting UE a UE that transmits a D2D discovery/communication message
  • the D2D receives the UE: that is, the UE that receives the discovery/communication message sent by the D2D transmitting UE.
  • Scheduling Control Information which is used for transmitting scheduling signaling on the D2D link, and the receiving end performs detection of the data channel according to the signaling indication in the received SCI.
  • FIG. 3 is a schematic diagram of transmission of SCI and data in an SCI period.
  • the control signaling carried in the SCI mainly includes the following information:
  • SA ID 8 bits
  • the SA ID is mainly used by the UE to determine whether the currently transmitted service is a service that it needs to receive.
  • MCS for indicating subsequent data transmission which is designed according to the existing LTE (Long Term Evolution) MCS and Transport Block Size (TBS), in the mode 1 resource allocation method, if the eNB passes The high-level signaling configures the level of the D2D data transmission MCS, and then the MCS in the SCI is obtained according to the configuration of the high-level signaling; if the eNB does not configure the level of the MCS of the data transmission, the UE spontaneously selects the MCS level of the data transmission.
  • LTE Long Term Evolution
  • TBS Transport Block Size
  • the frequency domain subchannel is not divided, but A flexible resource indication approach.
  • the frequency hopping and resource indication information of the Downlink Control Information Format (DCI format) 0 can be completely multiplexed in the SCI.
  • the Hopping Flag and the resource indication information are directly obtained according to the information in the resource grant (D2D grant).
  • the index information of the T-RPT pattern of the Data transmission is indicated in the SCI by the correspondence between the T-RPT index and the specific pattern of the system pre-defined or high-level configuration, so that the receiving end can be based on the T- in the SCI.
  • the indication of the RPT receives the data.
  • the T-RPT indicates a T-RPT pattern in consecutive N uplink subframes, and the T-RPT information in Mode 1 is directly obtained according to the indication information in the D2D grant.
  • the T-RPT indicates a T-RPT pattern in consecutive N D2D subframes, and the Mode 2 determines the D2D subframe according to the D2D subframe.
  • Timing Advance (6 bits)
  • the TA is mainly used to indicate the timing advance of the Data transmission in the Mode 1 resource allocation method.
  • the Mode 1 UE is in the Radio Resource Control (RRC) connection state.
  • RRC Radio Resource Control
  • the Mode 1 UE can obtain the TA information, and on the other hand, through the cellular uplink uplink shared channel (Physical Uplink Shared Channel, PUSCH). Synchronous transmission mode will reduce interference to cellular PUSCH transmission.
  • PUSCH Physical Uplink Shared Channel
  • D2D communication supports two D2D transmission resource allocation methods:
  • the resource allocation mode (Mode 2) of the UE autonomously selecting a resource that is, the UE selects a transmission resource for D2D transmission from a pre-configured or network broadcast transmission resource pool;
  • the resource allocation mode of the network scheduling (Mode1) is a mode in which the network allocates resources to the UE according to the Buffer state reporting (BSR) reported by the UE.
  • BSR Buffer state reporting
  • the current D2D design can not meet the transmission delay requirement of the fastest 20ms in V2V. Even if the TTI is reduced to half in the future, there is no guarantee that the data can be transmitted to the peer within 20ms. In addition, there is currently no different delay requirement for distinguishing different data. Further, there is currently no mechanism to provide delay request information for data packets.
  • an embodiment of the present invention provides a method for transmitting a data packet, so as to meet the requirement of low-latency data transmission, so as to transmit the low-latency data packet to the opposite end more quickly.
  • the transmission of an emergency-triggered message is further used to ensure reliable transmission.
  • FIG. 4 is a schematic flowchart of a method for implementing a method for sending a data packet, as shown in the figure, which may include:
  • Step 401 When the application layer generates a data packet, determine a delay requirement when the data packet is sent according to the cause of the data packet.
  • Step 402 Carry a sending indication when the data packet is sent to the access layer, where the sending indication is determined according to a delay requirement;
  • Step 403 Determine, according to the sending indication, according to the sending indication, and according to a current resource situation, a sending resource of the sending data packet.
  • Step 404 Send a data packet on the sending resource.
  • the solution can be implemented on the terminal of the V2V.
  • the application layer generates a data packet, determines the delay information according to the generated cause (such as the related message according to the use case), and sends the information to the access layer.
  • the access layer Such as the Packet Data Convergence Protocol (PDCP) layer.
  • PDCP Packet Data Convergence Protocol
  • the current resource situation may be the current resource grant.
  • determining that the delay requirement of the data packet transmission according to the sending indication is a low time delay determining that the delay requirement of the data packet transmission according to the sending indication is a low time delay:
  • the current resource grant when there is currently a transmission resource, the transmission of other data is stopped, and the current transmission resource is determined as the transmission resource of the transmission data packet;
  • the transmission resource for broadcasting is determined as the transmission resource of the transmission data packet, and/or the most recent transmission in the previously reserved D2D transmission resource pool
  • the resource is determined to be the sending resource for sending the packet.
  • the access layer may determine, according to the current grant (resource authorization) status, according to the indication information carried by the upper layer:
  • the latest transmission resource is directly selected from the broadcast or the previously reserved D2D transmission resource pool for transmission.
  • the data packet in order to improve the reliability of data transmission, may be repeatedly transmitted multiple times, or multiple resource pools may be selected for the same data transmission. That is, when the latest transmission resource in the previously reserved D2D transmission resource pool is determined as the transmission resource of the transmission data packet, when the data packet is transmitted on the transmission resource, the data may be sent multiple times on the latest transmission resource. The same data packet, or the same data packet is sent on the most recent transmission resource in a plurality of previously reserved D2D transmission resource pools.
  • the data packet when the data packet is sent to the access layer and carries the sending indication, it may be carried by using an inter-layer primitive or by using a preset data format.
  • the sent delay information may be carried by using an inter-layer primitive or may be carried by using a specific data format.
  • the content of the delay information may be indicated by 1 bit. For example, when the bit is set to 1, it indicates a packet with a low delay. When it is set to 0 or does not carry the bit, it indicates a packet with a normal delay. . It can also be represented by a plurality of bits of a preset length, and different values represent different delay requirements.
  • the application layer carries the delay indication information of the data packet when the data packet is sent, and the access layer selects the resource to send out as soon as possible according to the indication information. If there is currently a resource due to other data requests, other data transmissions are suspended, and the data packet with a delay of 20 ms is preferentially sent. If there is no available transmission resource, the transmission resource is selected in the broadcast or reserved resource pool, and the data packet with the delay requirement of 20 ms is sent as soon as possible. And, you can repeat the transmission several times. For a better understanding, the following is an example.
  • the application layer sends the alarm message with the delay indication information to the lower layer.
  • the Media Access Control (MAC) layer checks whether there is an authorized dedicated sending resource currently.
  • the sending resource may be requested because of other data, if present, if present.
  • the terminal uses the sending resource to preferentially schedule the data packet of the alarm message, and can continuously retransmit multiple times. If there is no dedicated dedicated transmission resource currently, the adjacent transmission resource is selected from the broadcast or pre-configured resource pool to perform the message transmission, and may be sent multiple times continuously. If there are multiple resource pools, the terminal may also choose to send the resources for transmission on multiple resource pools.
  • the low latency indication information can be carried by the inter-layer primitives.
  • the application layer sends the data to the PDCP
  • the low-latency indication information is separately indicated, and the PDCP sends the radio link control (RLC) to the MAC, and the LCP sends the indication information through the inter-layer primitive. Forward.
  • the resource selection and transmission process in Embodiment 1 is performed according to the indication information.
  • the sending indication is that the delay information can be indicated by the priority information.
  • the indication information can be bound to the priority information. For example, as the priority of the data packet transmission is indicated as 3 bits, when all 3 bits are 1, it indicates that it is the lowest delay transmission, then when the MAC receives the information, the resource selection in the embodiment 1 is performed. Sending process.
  • the indication information may indicate that the first one of the following data packet parts is delay information by using a special PDCP header structure. For example, a type of service data unit (SDU) type in the PDCP header is added to the type: low delay data.
  • SDU service data unit
  • the data packet is a low delay data packet.
  • the special RLC SDU format and the MAC SDU format can be used here, but not limited to.
  • Corresponding fields are added to the corresponding SDU format to indicate relevant low latency information. Priority is processed when the MAC layer schedules transmission, and an appropriate transmission resource is selected for transmission according to the resource condition.
  • the receiving end after receiving the PDCP data packet of this type, it can be sent to the upper layer preferentially according to the information of the packet header, and an alarm is sent as soon as possible.
  • the access layer When the application layer indicates that the data packet is a low-latency data packet, the access layer performs resource selection according to the following sequence principle:
  • the resource is preferentially used to send the alarm information
  • the terminal may select the resources in the highest priority resource pool to send, or ignore the priority binding relationship of the resource pools, and directly select the latest sending resources to send.
  • multiple recent transmission resources in multiple resource pools are selected to transmit the same data packet to improve the success rate of the reception. For example, if there are 4 resource pools, resources of 2-4 resource pools can be selected for transmission.
  • an apparatus for transmitting a data packet is further provided in the embodiment of the present invention. Since the principle of solving the problem is similar to the method for sending a data packet, the implementation of the device may refer to the implementation of the method, and the method is repeated. It will not be repeated here.
  • FIG. 5 is a schematic structural diagram of an apparatus for transmitting a data packet. As shown in the figure, the apparatus may include:
  • the delay requirement module 501 is configured to determine, when the application layer generates the data packet, a delay requirement when the data packet is sent according to the cause of the data packet generation;
  • the indicating module 502 is configured to carry a sending indication when the data packet is sent to the access layer, where the sending indication is determined according to a delay requirement;
  • the resource module 503 is configured to determine, according to the sending indication, according to the sending indication, and according to the current resource situation, a sending resource of the sending data packet;
  • the sending module 504 is configured to send a data packet on the sending resource.
  • the resource module 503 may further be used in the case where the current resource situation is the current resource authorization.
  • the resource module 503 may be further configured to: when determining, according to the sending indication, that the delay requirement of the data packet transmission is low: according to the current resource authorization, when other resources are currently sent, stopping other data.
  • the transmission of the current transmission resource is determined as the transmission resource of the transmission data packet; according to the current resource authorization, when the current resource is not transmitted, the transmission resource for broadcasting is determined as the transmission resource of the transmission data packet, and / or determine the most recent transmission resource in the previously reserved D2D transmission resource pool as the transmission resource of the transmission data packet.
  • the sending module 504 may be further configured to: when the latest transmission resource in the previously reserved D2D transmission resource pool is determined as the transmission resource of the transmission data packet, when the data packet is sent on the transmission resource, the latest transmission is performed. The same data packet is sent multiple times in succession on the resource, or the same data packet is sent on the most recent transmission resource in the plurality of previously reserved D2D transmission resource pools.
  • the indication module 502 may further be configured to use the priority information to indicate a delay request.
  • the indication module 502 may be further configured to carry the transmission indication when carrying the data packet to the access layer, using an inter-layer primitive, or using a preset data format.
  • the base station includes:
  • the processor 600 is configured to read a program in the memory 620 and perform the following process:
  • the delay requirement when the data packet is sent is determined according to the cause of the data packet generation
  • the transceiver 610 is configured to send data under the control of the processor 600, and performs the following processes:
  • a data packet is transmitted on the transmission resource.
  • the current resource situation is the current resource authorization situation.
  • the processor 600 is further configured to:
  • the delay requirement for determining the transmission of the data packet according to the transmission indication is a low time delay:
  • the transmission of other data is stopped, and the current transmission resource is determined as the transmission resource of the transmission data packet;
  • the transmission resource for broadcasting is determined as the transmission resource of the transmission data packet, and/or the latest transmission resource in the previously reserved D2D transmission resource pool is determined as Send the sending resource of the packet.
  • the transceiver 610 is further configured to:
  • the latest transmission resource in the previously reserved D2D transmission resource pool is determined as the transmission resource of the transmission data packet, when the data packet is transmitted on the transmission resource, the same data packet is continuously sent multiple times on the latest transmission resource, or The same data packet is sent on the most recent transmission resource in a plurality of previously reserved D2D transmission resource pools.
  • the transceiver 610 is further configured to:
  • the sending indication indicates the delay request by the priority information.
  • the transceiver 610 is further configured to:
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 600 and various circuits of memory represented by memory 620.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 610 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 600 in performing operations.
  • data generated in the application layer is transmitted to the bottom layer.
  • Time delay indication information carrying the data.
  • the resource selection and transmission are performed according to the indication information.
  • the transmission delay indication information is sent to the bottom layer, so that the bottom layer can select the transmission resource according to the delay indication information. It is thus also possible to send packets with low latency requirements to the receiving end as soon as possible. Meet its low latency, high reliability transmission requirements.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

公开了一种发送数据包的方法及装置，包括：在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；在所述发送资源上发送数据包。采用本发明可以满足各种时延数据传输的需要，以便按相应的时延要求将各种时延数据包传输到对端。本发明还提供了在确定该数据包发送的时延要求是低时延时的资源分配方案。进一步的，还提供了确保数据包发送可靠性的方案。

Description

一种发送数据包的方法及装置
本申请要求在2015年8月31日提交中国专利局、申请号为201510549096.1、发明名称为“一种发送数据包的方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，特别涉及一种发送数据包的方法及装置。
背景技术
对于车联网的各种用例(use case)中，有的use case要求的数据传输时延是20ms，有的是100ms或者160ms。
由于设备对设备(Device to Device，D2D)技术中的D2D discovery(D2D发现)提供的发送周期是320ms，D2D communication的调度周期是40ms。那么，即使后续将传输时间间隔(Transmission Time Interval，TTI)缩减为当前的一半，所有的周期降为一半，考虑到传输时延，调度时机等因素，也很难保证20ms内将数据发送到对端。
因此，现有技术的不足在于：如果采用D2D技术进行相关数据的传输，对于20ms低时延的情况，很难满足车联网的各种use case需求。
进一步的，目前也没有机制提供数据包的时延要求信息。
发明内容
本发明提供了一种发送数据包的方法及装置，用以满足各种时延数据传输的需要，以便按相应的时延要求将各种时延数据包传输到对端。
本发明实施例中提供了一种发送数据包的方法，包括：
在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
在所述发送资源上发送数据包。
较佳地，当前资源情况是当前的资源授权的情况。
较佳地，在根据所述发送指示确定该数据包发送的时延要求是低时延时：
根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有 的发送资源确定为发送数据包的发送资源；
根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
较佳地，将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
较佳地，所述发送指示通过优先级信息来指示时延要求。
较佳地，在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
本发明实施例中提供了一种发送数据包的装置，包括：
时延要求模块，用于在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
指示模块，用于在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
资源模块，用于在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
发送模块，用于在所述发送资源上发送数据包。
较佳地，资源模块进一步用于当前资源情况是当前的资源授权的情况。
较佳地，资源模块进一步用于在根据所述发送指示确定该数据包发送的时延要求是低时延时：根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
较佳地，发送模块进一步用于将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
较佳地，指示模块进一步用于所述发送指示通过优先级信息来指示时延要求。
较佳地，指示模块进一步用于在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
本发明实施例中提供了一种发送数据包的装置，包括：
处理器，用于读取存储器中的程序，执行下列过程：
在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
收发机，用于在处理器的控制下发送数据，执行下列过程：
在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
在所述发送资源上发送数据包。
较佳的，当前资源情况是当前的资源授权的情况。
较佳的，所述处理器进一步用于：
在根据所述发送指示确定该数据包发送的时延要求是低时延时：
根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；
根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
较佳的，所述收发机进一步用于：
将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
较佳的，所述收发机进一步用于：
所述发送指示通过优先级信息来指示时延要求。
较佳的，所述收发机进一步用于：
在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
本发明有益效果如下：
在本发明实施例提供的技术方案中，由于在产生数据包时便根据数据包产生原因确定了该数据包的时延要求，这样，在为该数据包分配发送资源时，便可以根据时延要求来安排与之相适应的发送资源，也即，将传输时延指示信息给底层，使得底层能够根据时延指示信息选择传输资源。显然，当确定该数据包是低时延要求时，便可以安排与该时延要求相适应的资源去发送，因此，采用本方案可以满足各种时延数据传输的需要，以便按相应的时延要求将各种时延数据包传输到对端。
进一步的，方案中还提供了在确定该数据包发送的时延要求是低时延时的资源分配方 案。
进一步的，还提供了确保数据包发送可靠性的方案。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为本发明实施例中车联网通信方式示意图；
图2为本发明实施例中D2D发现/通信示意图；
图3为本发明实施例中一个SCI周期内SCI和data的传输示意图；
图4为本发明实施例中发送数据包的方法实施流程示意图；
图5为本发明实施例中发送数据包的装置结构示意图；
图6为本发明实施例中基站结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
下面结合附图对本发明的具体实施方式进行说明。
发明人在发明过程中注意到：
图1为车联网通信方式示意图，如图所示，在车联网中，车对外界的信息交换(vehicle to X，V2X)包括车对车的信息交换(vehicle to vehicle，V2V)、车与基础设施的信息交换(Vehicle-to-Infrastructure，V2I)、车与人的信息交换(Vehicle-to-Pedestrian，V2P)三种。
由于3GPP标准化组织中的系统架构需求组(System Architecture，3GPP SA1)对V2I和V2P的use case和需求(requirement)还没有完全确定，这里只列出与V2V相关的内容。
SA1定义的V2V use case和requirement如表1所示：
表1 SA1定义的V2V use case和requirement
Figure PCTCN2016096732-appb-000001
Figure PCTCN2016096732-appb-000002
Figure PCTCN2016096732-appb-000003
通过这些use case的时延要求可以看出，在pre-crash sensing warining的情况下，时延要求是20ms，并且要求高可靠传输。
对于紧急事件触发的消息，这些消息不是通常的100ms要求，而可能是50ms，甚至更短。在这些情况下，一方面要满足时延要求，另一方面也要保证可靠传输。
然而，现有的D2D通信机制并不能保证该低时延要求，也不能保证传输的可靠性，下面进行具体说明。
一、D2D接近服务
D2D，即终端直通技术，是指邻近的终端可以在近距离范围内通过直连链路进行数据传输的方式，不需要通过中心节点(即基站)进行转发，也不需要通过传统的蜂窝链路进行UE间的信息传输。
3GPP中，D2D接近服务包括以下两大类：
D2D发现：UE使用E-UTRA来确认另外一个UE在其附近。例如，D2D UE可以使用该服务来寻找附近的出租车、寻找在其附近的朋友等；
D2D通信：图2为D2D发现/通信示意图，如图所示，相互接近的UE，通过在两个UE之间直接建立链路，这样将原本通过网络传输的通信链路转化为本地的直接通信链路， 节省了大量的带宽和网络效率；或者两个相互接近的UE，可以利用直接链路通信来获得稳定高速低廉的通信服务。接近服务通信一般是在网络侧控制或者辅助下进行的，演进型基站(evolved Node Base Station，eNB)甚至可能会为进行接近服务通信的UE动态地分配资源。
为了便于描述，可以定义两种链路类型：
D2D链路：设备和设备之间直接进行通信的链路；
设备到节点(Device-to-Node，D2N)链路：设备和网络节点之间进行通信的链路。
此外，参与D2D发现/通信的UE分为两种角色：
D2D发送UE：即发送D2D发现/通信消息的UE；
D2D接收UE：即接收D2D发送UE发送的发现/通信消息的UE。
二、PC5接口D2D通信的传输方法
在Rel-12(Release-12，版本12)的D2D通信中，仅引入两种物理信道的定义：
调度控制信息(Scheduling Control Information，SCI)，其用于传输D2D链路上的调度信令，接收端根据接收到的SCI中的信令指示，进行数据(Data)信道的检测；
Data信道，用于传输D2D链路上的数据，其传输的属性在SCI中指示。
图3为一个SCI周期内SCI和data的传输示意图，如图所示的SCI周期内，在SCI中承载的控制信令中，主要包含如下信息：
1、调度分配(Scheduling Assignment，SA)ID(8比特)：
SA ID主要用于接收UE判断当前的传输的业务是否是自己需要接收的业务。
2、调制编码方式(Modulation and Coding Scheme，MCS)(5比特)
用于指示后续数据传输的MCS，其沿用现有的LTE(Long Term Evolution，长期演进)的MCS和传输块格式(Transport Block Size，TBS)的设计，在mode 1资源分配方法中，如果eNB通过高层信令配置了D2D数据传输MCS的等级，那么SCI中的MCS依据高层信令的配置获得；如果eNB没有配置数据传输的MCS的等级，那么UE自发的选择数据传输的MCS等级。
3、Hopping flag(跳频标志)和资源指示信息
Figure PCTCN2016096732-appb-000004
在D2D通信中为了获得更好的覆盖范围，需要支持跳频的传输，从而获得频域分集增益。同时在公共安全(Public Safety)网络中需要支持多种业务类型，而不仅仅是VoIP(Voice over IP，基于IP的语音传输)业务，因此在Data的传输中没有划分频域子信道，而是采用灵活的资源指示的方法。在此基础上，下行控制信令格式(Downlink Control Information format，DCI format)0的跳频和资源指示信息可以完全的复用在SCI中。在Mode 1的资源分配方法中，Hopping Flag和资源指示信息是根据资源授权(D2D grant)中的信息直接得到的。
4、发送时间重复图样(Time Repetition Patterns for Transmission，T-RPT)指示(7比特)
通过系统预定义或者高层配置的T-RPT索引(index)与具体模式(pattern)的对应关系，在SCI中指示Data传输的T-RPT pattern的index信息，从而接收端可以根据SCI中的T-RPT的指示接收数据。
Mode 1资源分配方法中，T-RPT指示的是连续的N个上行子帧中的T-RPT pattern，Mode 1中T-RPT信息是根据D2D grant中的指示信息直接获得的。
Mode 2资源分配方法中，T-RPT指示的是连续的N个D2D子帧中的T-RPT pattern，Mode 2中是依据D2D子帧进行确定。
5、时间提前量(Timing Advance，TA)(6比特)
这里TA主要用于指示Mode 1资源分配方法中，Data传输的定时的提前量。由于Mode 1的UE处于无线资源控制(Radio Resource Control，RRC)连接状态，一方面Mode 1的UE可以获得TA信息，另一方面通过与蜂窝上行物理上行链路共享信道(Physical Uplink Shared Channel，PUSCH)同步的传输方式，会降低对蜂窝PUSCH传输的干扰。
三、LTE D2D通信资源分配方式
D2D通信支持两种D2D发送资源分配方式：
1、UE自主选择资源的资源分配方式(Mode2)：即UE自行从预配置或者网络广播的发送资源池中选择发送资源进行D2D发送的方式；
2、网络调度的资源分配方式(Mode1)：即由网络根据UE上报的直通链路(Sidelink)缓冲区上报(Buffer state reporting，BSR)为UE分配资源的方式。
综上可见，目前D2D的设计无法满足V2V中最快20ms的传输时延要求，即使在未来将TTI缩减为一半，也不能保证数据可以在20ms内传输到对端。另外目前也没有区分不同的数据的不同时延要求。进一步的，目前也没有机制提供数据包的时延要求信息。
基于此，在本发明实施例提供了一种发送数据包的方法，用以满足低时延数据传输的需要，以便更快地将低时延数据包传输到对端。例如对于紧急事件触发的消息的传输，进一步的还用以保证可靠传输。
图4为发送数据包的方法实施流程示意图，如图所示，可以包括：
步骤401、在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
步骤402、在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
步骤403、在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
步骤404、在所述发送资源上发送数据包。
该方案可在V2V的终端上实施，实施中，应用层产生数据包，根据产生的原因(如根据use case的相关消息)的不同，确定时延信息，并将该信息发给接入层，如分组数据聚合协议(Packet Data Convergence Protocol，PDCP)层。
实施中，当前资源情况可以是当前的资源授权(grant)的情况。
具体实施中，在根据所述发送指示确定该数据包发送的时延要求是低时延时：
根据当前的资源授权(grant)的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；
根据当前的资源授权(grant)的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
具体的，接入层可以根据上层携带的指示信息，根据当前的grant(资源授权)的情况，确定采用何种方式进行发送：
当当前有发送资源时(如mode 1方式获取的资源)，可以停止其他数据的发送，提前调度低时延要求的数据包发送；
当当前没有发送资源时，直接从广播或者之前预留的D2D发送资源池中选择最近的发送资源进行发送。
具体实施中，为了提高数据传输的可靠性，数据包可以连续重复多次发送，也可以选择多个资源池进行相同数据发送。也即，在将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，可以在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
实施中，在将数据包发往接入层时携带发送指示时，可以使用层间原语来携带，或使用预设的数据格式来携带。
具体的，发送的时延信息可以使用层间原语来携带，也可以使用特定的数据格式来携带。时延信息的内容可以采用1比特来指示，例如，将该比特设置为1时，表示是低时延的数据包，设置为0时或者没有携带该比特，则表示为正常时延的数据包。也可以用多个预先设定长度的比特来表示，不同的取值，代表时延要求不同。
上述方案中，主要构思在于，应用层在下发数据包时携带该数据包的时延指示信息，接入层根据该指示信息，尽快选择资源发送出去。如果当前正好有因为其他数据申请的资源，则暂停其他数据发送，优先发送时延要求20ms的数据包。如果当前没有可用发送资源，则在广播或者预留的资源池中选择发送资源，尽快发送时延要求为20ms的数据包。并且，可以重复几次发送。为更好地理解，下面再以实例进行说明。
实施例1：
当一辆车发现要发生与另一辆车不可避免地碰撞时，即pre-crash sensing warning的use case，此时会产生相关的告警消息。应用层将该告警消息附加上时延指示信息发送给低层。媒体接入控制(Media Access Control，MAC)层收到该数据包，以及时延指示信息后，查看当前是否存在授权的专用发送资源，该发送资源可能是因为其他数据而请求到的，如果存在，则终端使用该发送资源，优先调度该告警消息的数据包，并且可以连续重传多次。如果当前没有授权的专用发送资源，则从广播或者预配置的资源池中选择临近的发送资源进行该消息发送，可以连续发送多次。如果存在多个资源池，终端也可以选择在多个资源池上都选择发送资源进行发送。
实施例2：
低时延指示信息可以通过层间原语，进行携带。比如应用层将该数据发给PDCP时，单独指示该低时延指示信息，PDCP给无线链路控制(Radio Link Control，RLC),RLC发给MAC，都通过层间原语进行该指示信息的转发。MAC收到后，根据该指示信息，执行实施例1中的资源选择和发送过程。
实施例3：
本例中，发送指示是可以通过优先级信息来指示时延要求的。
该指示信息可以和优先级信息绑定。比如现在随着数据包传输的优先级指示为3个比特，当3个比特均为1时，表示是最低时延发送，那么当MAC收到该信息时，执行实施例1中的资源选择和发送过程。
实施例4：
该指示信息可以通过特殊的PDCP头结构来指示后面数据包部分的前1-多个比特为时延信息。比如：PDCP头中的业务数据单元(Service Data Unit，SDU)类型(type)中增加一类：低时延数据。
那么可以根据PDCP头中的这个信息，获知该数据包为低时延数据包。在发送给底层时，单独指示其为低时延数据包，这里可以采用但不局限于使用特殊的RLC SDU格式以及MAC SDU格式。在相应的SDU格式中增加相应的域来指示相关的低时延信息。在MAC层调度传输时优先处理，并根据资源情况，选择合适的发送资源进行发送。
对于接收端，在收到此类型的PDCP数据包，可以根据包头的信息，优先发送给上层，尽快发出告警。
实施例5：
当应用层指示了该数据包为低时延数据包时，接入层按照下面的顺序原则进行资源选择：
有立刻可以使用的基站分配的专用发送资源，则优先使用该资源发送告警信息；
如果没有合适的专用发送资源池，则在广播或者预配置的资源池中进行选择
当存在多个资源池，终端可以选择最高优先级的资源池中的资源进行发送，也可以忽略这些资源池的优先级绑定关系，而是直接从中选择最近的发送资源进行发送；
如果sidelink接口上的信道质量不好，则选择多个资源池中的多个最近的发送资源进行相同数据包的发送，以提高接收成功率。如，在有4个资源池的情况下，可以选择2-4个资源池的资源进行发送。
基于同一发明构思，本发明实施例中还提供了一种发送数据包的装置，由于该装置解决问题的原理与一种发送数据包的方法相似，因此这些设备的实施可以参见方法的实施，重复之处不再赘述。
图5为发送数据包的装置结构示意图，如图所示，装置中可以包括：
时延要求模块501，用于在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
指示模块502，用于在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
资源模块503，用于在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
发送模块504，用于在所述发送资源上发送数据包。
实施中，资源模块503还可以进一步用于当前资源情况是当前的资源授权的情况。
实施中，资源模块503还可以进一步用于在根据所述发送指示确定该数据包发送的时延要求是低时延时：根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
实施中，发送模块504还可以进一步用于将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
实施中，指示模块502还可以进一步用于所述发送指示通过优先级信息来指示时延要求。
实施中，指示模块502还可以进一步用于在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
为了描述的方便，以上所述装置的各部分以功能分为各种模块或单元分别描述。当然，在实施本发明时可以把各模块或单元的功能在同一个或多个软件或硬件中实现。
在实施本发明实施例提供的技术方案时，可以按如下方式实施。
图6为基站结构示意图，如图所示，基站中包括：
处理器600，用于读取存储器620中的程序，执行下列过程：
在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
收发机610，用于在处理器600的控制下发送数据，执行下列过程：
在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
在所述发送资源上发送数据包。
实施中，当前资源情况是当前的资源授权的情况。
实施中，所述处理器600进一步用于：
在根据所述发送指示确定该数据包发送的时延要求是低时延时：
根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；
根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
实施中，所述收发机610进一步用于：
将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
实施中，所述收发机610进一步用于：
所述发送指示通过优先级信息来指示时延要求。
实施中，所述收发机610进一步用于：
在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
其中，在图6中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器600代表的一个或多个处理器和存储器620代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机610可以是多个元件，即包括发送机和收发机，提供用于在传输介质上与各种其他装置通信的单元。处理器600负责管理总线架构和通常的处理，存储器620可以存储处理器600在执行操作时所使用的数据。
综上所述，在本发明实施例提供的技术方案中，在应用层生成的数据在发给底层传输 时，携带该数据的时延指示信息。底层收到后，根据该指示信息进行资源选择和发送。具体的，是将传输时延指示信息给底层，使得底层能够根据时延指示信息选择传输资源。也因而可以使低时延要求的数据包尽快地发送给接收端。满足其低时延，高可靠的传输要求。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (18)

  1. 一种发送数据包的方法，其特征在于，包括：
    在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
    在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
    在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
    在所述发送资源上发送数据包。
  2. 如权利要求1所述的方法，其特征在于，当前资源情况是当前的资源授权的情况。
  3. 如权利要求2所述的方法，其特征在于，在根据所述发送指示确定该数据包发送的时延要求是低时延时：
    根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；
    根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的设备对设备D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
  4. 如权利要求3所述的方法，其特征在于，将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
  5. 如权利要求1所述的方法，其特征在于，所述发送指示通过优先级信息来指示时延要求。
  6. 如权利要求1至5任一所述的方法，其特征在于，在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
  7. 一种发送数据包的装置，其特征在于，包括：
    时延要求模块，用于在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
    指示模块，用于在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
    资源模块，用于在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
    发送模块，用于在所述发送资源上发送数据包。
  8. 如权利要求7所述的装置，其特征在于，资源模块进一步用于当前资源情况是当前的资源授权的情况。
  9. 如权利要求8所述的装置，其特征在于，资源模块进一步用于在根据所述发送指 示确定该数据包发送的时延要求是低时延时：根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
  10. 如权利要求9所述的装置，其特征在于，发送模块进一步用于将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
  11. 如权利要求7所述的装置，其特征在于，指示模块进一步用于所述发送指示通过优先级信息来指示时延要求。
  12. 如权利要求7至11任一所述的装置，其特征在于，指示模块进一步用于在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
  13. 一种发送数据包的装置，其特征在于，包括：
    处理器，用于读取存储器中的程序，执行下列过程：
    在应用层产生数据包时，根据数据包产生原因确定该数据包发送时的时延要求；
    在接入层根据所述发送指示以及根据当前资源情况，确定发送数据包的发送资源；
    收发机，用于在处理器的控制下发送数据，执行下列过程：
    在将数据包发往接入层时携带发送指示，所述发送指示是根据时延要求确定的；
    在所述发送资源上发送数据包。
  14. 如权利要求13所述的装置，其特征在于，所述处理器用于当前资源情况是当前的资源授权的情况。
  15. 如权利要求14所述的装置，其特征在于，所述处理器进一步用于：
    在根据所述发送指示确定该数据包发送的时延要求是低时延时：
    根据当前的资源授权的情况，在当前有发送资源时，停止其他数据的发送，将当前有的发送资源确定为发送数据包的发送资源；
    根据当前的资源授权的情况，在当前没有发送资源时，将用于广播的发送资源确定为发送数据包的发送资源，和/或将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源。
  16. 如权利要求15所述的装置，其特征在于，所述收发机进一步用于：
    将之前预留的D2D发送资源池中最近的发送资源确定为发送数据包的发送资源时，在所述发送资源上发送数据包时，在最近的发送资源上连续多次发送同一数据包，或在多个 之前预留的D2D发送资源池中最近的发送资源上发送同一数据包。
  17. 如权利要求13所述的装置，其特征在于，实施中，所述收发机进一步用于所述发送指示通过优先级信息来指示时延要求。
  18. 如权利要求13－17任一项所述的装置，其特征在于，所述收发机进一步用于：
    在将数据包发往接入层时携带发送指示时，使用层间原语来携带，或使用预设的数据格式来携带。
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