WO2016192466A1 - Procédé et dispositif de planification - Google Patents

Procédé et dispositif de planification Download PDF

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Publication number
WO2016192466A1
WO2016192466A1 PCT/CN2016/079058 CN2016079058W WO2016192466A1 WO 2016192466 A1 WO2016192466 A1 WO 2016192466A1 CN 2016079058 W CN2016079058 W CN 2016079058W WO 2016192466 A1 WO2016192466 A1 WO 2016192466A1
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Prior art keywords
data packet
delay
value
transmission
scheduling
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PCT/CN2016/079058
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English (en)
Chinese (zh)
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焦斌
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电信科学技术研究院
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Publication of WO2016192466A1 publication Critical patent/WO2016192466A1/fr

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    • 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
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a method and device for performing scheduling.
  • the scheduling device determines the scheduling priority bearer according to the QoS class identifier (QCI; Quality of Service). The scheduling priority of the data stream. In addition, the scheduling device also prioritizes that the retransmitted data block is preferentially scheduled during scheduling. Since the existing scheduling mechanism generally transmits Medium Access Control (MAC) according to the default maximum number of retransmissions, the transmission delay of a data packet in the best case is only a few milliseconds (for example, the network is empty and the channel is not available). The condition is good, and in the worst case (such as network reload causes queue waiting delay, retransmission delay, etc.) may reach tens of milliseconds.
  • MAC Medium Access Control
  • the existing scheduling mechanism can satisfy the relatively loose (and can allow large delay jitter) delay requirements for multimedia stream services such as voice and video.
  • multimedia stream services such as voice and video.
  • the probability that the arrival delay of the data packet to which the service belongs is less than a certain threshold is 99.9% or even 99.999%.
  • Each packet is designed with a granularity for the granularity to meet this near-critical requirement for packet transmission latency.
  • the current scheduling mechanism mainly guarantees the average delay performance of the service.
  • the existing scheduling mechanism cannot meet the requirements of reliable transmission.
  • the current scheduling method cannot satisfy the service with relatively high latency requirements.
  • the present invention provides a method and a device for performing scheduling, which are used to solve the problem that the current scheduling mode existing in the prior art cannot meet the service with relatively high latency requirements.
  • a method for scheduling is provided in the embodiment of the present application, where the method includes:
  • the scheduling device determines the air interface delay budget value of the data packet according to the service parameter corresponding to the service, where the air interface delay budget value indicates that the corresponding data packet enters the sending device MAC The maximum allowed delay from the layer to the data packet being submitted from the receiving device MAC layer to the upper layer;
  • the scheduling device schedules the sending device and the receiving device according to the determined transmission mode.
  • the scheduling device determines, according to the service parameter corresponding to the service, an air interface delay budget value of the data packet, including:
  • the scheduling device determines an air interface delay budget value of the data packet according to a waiting delay value of the data packet and an end-to-end delay requirement value in the service parameter.
  • the scheduling device determines, according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter, the air interface delay budget value of the data packet, including:
  • the delay estimation value is a delay estimation value of the receiving device to the external network; and for the downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the method before the scheduling device determines the air interface delay budget value of the data packet, the method further includes:
  • the scheduling device adjusts the delay estimation value according to delay deviation information or an actual delay threshold value from the sending device or the receiving device.
  • the scheduling device determines a waiting delay value of the data packet according to the following manner:
  • the scheduling device determines a waiting delay value of the data packet according to the timestamp information of the data packet.
  • the timestamp information of the data packet is sent by the sending device
  • the timestamp information of the data packet is sent by the sending device, or the timestamp information of the data packet is according to the first data packet sent by the sending device.
  • the timestamp information is determined by the time of receipt of the timestamp information of the first packet.
  • the scheduling device determines, according to the air interface delay budget value of the data packet, a transmission manner of the data packet, including:
  • the scheduling device determines that the data packet is transmitted in a manner that can be retransmitted;
  • the scheduling device determines that the data packet is transmitted in a manner that cannot be retransmitted.
  • the manner in which the retransmission can be performed is that the scheduling sending device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • each transmission is to transmit the data packet in at least one transmission channel in space; or transmit the data packet in at least one transmission channel in a frequency domain.
  • the manner in which the retransmission cannot be performed is: at least one transmission channel in space during initial transmission Transmitting the data packet; or transmitting the data packet in at least one transmission channel in the frequency domain.
  • the sending device determines timestamp information of the data packet
  • the sending device notifies the scheduling device to the timestamp information, so that the scheduling device determines the air interface delay budget value of the data packet according to the timestamp information of the data packet, according to the air interface of the data packet.
  • the delay budget value is used to determine the transmission mode of the data packet; wherein the air interface delay budget value indicates a maximum allowable delay between the corresponding data packet entering the sending device MAC layer and the data packet being submitted from the receiving device MAC layer to the upper layer. ;
  • the transmitting device transmits the data packet according to a transmission manner determined by the scheduling device.
  • the air interface delay budget value of the data packet is an end-to-end delay requirement value of the scheduling device according to the waiting delay value, the delay estimation value, and the service parameter of the service. definite;
  • the delay estimation value is a delay estimation value of the receiving device to the external network; and for the downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the method before the sending, by the sending device, the data packet according to the transmission mode determined by the scheduling device, the method further includes:
  • the sending device sends the delay deviation information or the actual delay threshold to the scheduling device, so that the scheduling device according to the delay deviation information Adjusting the estimated delay value;
  • the delay deviation information indicates a deviation between the estimated delay and the actual network transmission delay.
  • a scheduling device for scheduling is provided in the embodiment of the present application, where the scheduling device includes:
  • a first determining module configured to determine, according to the service parameter corresponding to the service, an air interface delay budget value of the data packet, where the air interface delay budget value indicates the corresponding data.
  • a second determining module configured to determine, according to an air interface delay budget value of the data packet, a transmission mode of the data packet
  • a scheduling module configured to schedule the sending device and the receiving device according to the determined transmission manner.
  • the first determining module is specifically configured to:
  • the first determining module is specifically configured to:
  • the uplink delay estimation value is a delay estimation value of the receiving device to the external network
  • the downlink delay estimation value is an estimated delay value of the external network to the sending device.
  • the first determining module is further configured to:
  • the delay estimate is adjusted based on delay deviation information from the transmitting device or the receiving device or an actual delay threshold.
  • the first determining module is specifically configured to determine a waiting delay value of the data packet according to the following manner:
  • the timestamp information of the data packet is sent by the sending device
  • the timestamp information of the data packet is sent by the sending device, or the timestamp information of the data packet is according to the first data packet sent by the sending device.
  • the timestamp information is determined by the time of receipt of the timestamp information of the first packet.
  • the second determining module is specifically configured to:
  • the air interface delay budget value is not less than a set threshold, determining that the data packet is transmitted in a manner capable of retransmission;
  • the air interface delay budget value is less than a set threshold, determining that the data packet is transmitted in a manner that cannot be retransmitted.
  • the manner in which the retransmission can be performed is that the scheduling sending device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • each transmission is to transmit the data packet in at least one transmission channel in space; or transmit the data packet in at least one transmission channel in a frequency domain.
  • the manner in which the retransmission cannot be performed is to transmit the data packet in at least one transmission channel in space for initial transmission; or to transmit the data packet in at least one transmission channel in a frequency domain.
  • a third determining module configured to determine timestamp information of the data packet for each data packet of the service
  • a notification module configured to notify the scheduling device of the timestamp information, so that the scheduling device determines, according to the timestamp information of the data packet, an air interface delay budget value of the data packet, according to the data packet
  • the air interface delay budget value determines the transmission mode of the data packet; wherein the air interface delay budget value indicates that the corresponding data packet enters the sending device MAC layer to the maximum allowable time when the data packet is submitted from the receiving device MAC layer to the upper layer.
  • a transmission module configured to transmit the data packet according to a transmission manner determined by the scheduling device.
  • the air interface delay budget value of the data packet is an end-to-end delay requirement value of the scheduling device according to the waiting delay value, the delay estimation value, and the service parameter of the service. definite;
  • the delay estimation value is a delay estimation value of the receiving device to the external network; and for the downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the third determining module is further configured to:
  • the delay information or the actual delay threshold is sent to the scheduling device, so that the scheduling device adjusts the time according to the delay deviation information.
  • the delay deviation information indicates a deviation between the estimated delay and the actual network transmission delay.
  • the embodiment of the present application provides a scheduling device for scheduling, including:
  • a processor for reading a program in the memory performing the following process:
  • determining an air interface delay budget value of the data packet according to the service parameter corresponding to the service where the air interface delay budget value indicates that the corresponding data packet enters the sending device MAC layer to the data packet receiving
  • the maximum allowed delay of the MAC layer of the device is submitted to the upper layer;
  • the transmission mode of the data packet is determined according to the air interface delay budget value of the data packet; and the transmitting device and the receiving device are scheduled by the transceiver according to the determined transmission mode;
  • a transceiver for receiving and transmitting data under the control of a processor.
  • the embodiment of the present application further provides a sending device that performs scheduling, including:
  • a processor for reading a program in the memory performing the following process:
  • the data packet transmission mode is determined according to the air interface delay budget value of the data packet; wherein the air interface delay budget value indicates that the corresponding data packet enters the sending device MAC layer to the maximum allowable time when the data packet is submitted from the receiving device MAC layer to the upper layer. Delaying; transmitting data packets through the transceiver according to the transmission mode determined by the scheduling device;
  • a transceiver for receiving and transmitting data under the control of a processor.
  • the embodiment of the present application determines an air interface delay budget value of the data packet according to the service parameter corresponding to the service, and determines the data according to the air interface delay budget value of the data packet.
  • the transmission mode of the packet, and scheduling the transmitting device and the receiving device according to the determined transmission mode Since the embodiment of the present application determines the transmission mode by using the data packet as the granularity, the service with relatively high delay requirement can be satisfied.
  • FIG. 1 is a schematic structural diagram of a system for scheduling according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a first scheduling device according to an embodiment of the present application.
  • FIG. 3 is a structural view of a first sending device according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a second scheduling device according to an embodiment of the present application.
  • FIG. 5 is a structural diagram of a second sending device according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a method for scheduling according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a method for scheduling according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a method for uplink transmission according to an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of a method for downlink transmission according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a method for transmitting between terminals according to an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of a method for adjusting a delay budget estimate according to an embodiment of the present application.
  • the embodiment of the present application determines the air interface delay budget value of the data packet according to the service parameter corresponding to the executed service, and determines the data packet transmission mode according to the air interface delay budget value of the data packet, and according to The determined transmission mode schedules the transmitting device and the receiving device. Since the embodiment of the present application determines the transmission mode by using the data packet as the granularity, the service with relatively high delay requirement can be satisfied.
  • the air interface delay budget value of the data packet indicates the maximum allowable delay between the corresponding data packet entering the sending device MAC layer and the data packet being submitted from the receiving device MAC layer to the upper layer.
  • the waiting delay value of the data packet indicates the delay experienced after the data packet is delivered to the MAC layer of the transmitting end until the scheduler receives the scheduling request;
  • the packet waiting delay is a part of the air interface delay, especially when the data packet enters the MAC layer until the data packet is actually transmitted through the air interface.
  • the network transmission delay is in addition to the air interface delay, that is, the delay from the transmission of the data packet between the access point and the communication peer communication entity.
  • End-to-end delay requirement value indicates that the end-to-end delay requirement refers to the delay requirement between the service layer communication entities, and the end-to-end communication includes the terminal-server (Client-Server) mode communication, including the terminal and the terminal.
  • the (Peer-Peer) mode communication data may pass through the forwarding node or not through the forwarding node under the terminal and the terminal.
  • Delay Estimation The estimated delay estimate of the scheduling device based on the service context or historical information.
  • the estimated delay is the estimated delay of the receiving device to the external network; if the downlink is transmitted, the estimated delay is the estimated delay of the external network to the transmitting device.
  • Delay deviation information indicates the deviation between the delay estimate and the actual network transmission delay.
  • Estimated time delay The actual time delay between the access point and the peer communication entity is indicated by the service data.
  • the location of the peer entity in the network may not be fixed (for example, there may be multiple redirects in the network).
  • the web server), and the data routing itself may not be fixed, thus causing a certain deviation between the estimated value and the actual network transmission delay.
  • Actual delay threshold indicates the "redundant delay" calculated by the receiving end according to the end-to-end delay requirement and the actual end-to-end transmission delay (for example, the end-to-end delay requirement is 10 ms, and the end-to-end is actually measured. If the delay is 8ms and the redundancy is 2ms), the receiving end can add the redundancy delay to the current air interface delay budget to obtain the delay threshold (that is, the actual delay threshold) allowed by the actual air interface.
  • the system for scheduling in the embodiment of the present application includes: a scheduling device 10, a sending device 20, and a receiving device 30.
  • the scheduling device 10 is configured to determine, according to the service parameter corresponding to the service, the air interface delay budget value of the data packet for each data packet of the service, where the air interface delay budget value indicates that the corresponding data packet enters the MAC layer of the sending device.
  • the sending device 20 is configured to send a data packet according to a transmission mode configured by the scheduling device 10;
  • the receiving device 30 is configured to receive a data packet according to a transmission mode configured by the scheduling device 10.
  • the scheduling device determines the transmission mode by using the data packet as the granularity.
  • the air interface delay budget value of the data packet is determined according to the service parameter corresponding to the executed service.
  • the service parameters corresponding to the service include but are not limited to some or all of the following:
  • End-to-end delay threshold requirements delay estimation values, service transmission reliability requirements, service characteristic information (periodic services and their cycle time length, bursty services).
  • the service parameters of the embodiment of the present application are semi-static parameters.
  • semi-static parameters are configured on the scheduling device, which brings high flexibility. Allow these parameters to be configured differently by different operators and different industry application scenarios.
  • the delay estimation value is a delay estimation value of the receiving device to the external network; for downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the transmission in the embodiment of the present application may be an uplink transmission; or may be a downlink transmission; and may also be transmitted between terminals.
  • the sending device in the embodiment of the present application is a terminal; the receiving device is an access point.
  • the terminal in the embodiment of the present application may be a smart phone, various types of smart sensors, various types of intelligent robot arm, and various types of smart wearable devices.
  • the access point in the embodiment of the present application may be a base station, a relay device, a home base station in a cellular communication, and an access point in a Wifi (an ordinary home WiFi router integrates an access point and a router function
  • the 802.11 protocol also supports the scenario where the access and the controller are separated, and is used in the scenario of multiple access point networking.
  • the access point mainly refers to the infrastructure equipment deployed by the operator or the user for receiving and transmitting air interface data. Wireless routers, etc.
  • the sending device in the embodiment of the present application is an access point; the receiving device is a terminal.
  • the transmitting device in the embodiment of the present application is a terminal; the receiving device is a terminal.
  • the delay budget of the data packet from the access network to the external network is relatively fixed, and this part mainly depends on the spatial distance between the access network and the external network peer entity, so this part of the budget In business
  • the establishment process can be determined as a semi-static parameter.
  • the scheduling device calculates the air interface delay reliability budget for each data packet when scheduling.
  • the access point after receiving the downlink data packet, the access point generates timestamp information for the data packet, and notifies the scheduling device of the timestamp information of the downlink data when the scheduling device is requested to perform downlink scheduling.
  • the scheduling device calculates an air interface delay reliability budget for the downlink data packet.
  • the direct transmission between the terminals is performed. Since the forwarding delay of the network side is not involved, the scheduling device determines the data packet air interface delay budget according to the end-to-end delay when determining the scheduling scheme.
  • the scheduling device determines the air interface delay budget value of the data packet according to the service parameter corresponding to the executed service, and determines the air interface delay of the data packet according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter. Budget value.
  • the scheduling device determines the air interface delay budget value of the data packet according to the waiting delay value of the data packet, the estimated delay value, and the end-to-end delay requirement value in the service parameter;
  • the uplink delay estimation value is an estimated delay value of the receiving device to the external network.
  • the air interface delay budget value is equal to the end-to-end delay requirement value minus the waiting delay value minus the delay estimation value.
  • the waiting delay value of the embodiment of the present application is determined by the scheduling device according to the timestamp information of the data packet.
  • the sending device If the service is not a periodic service, the sending device generates timestamp information for each data packet.
  • the timestamp information here may be absolute timestamp information or relative timestamp information.
  • the sending device If the service is a periodic service, the sending device generates timestamp information for the first data packet, where the timestamp information may be absolute timestamp information or relative timestamp information. For the timestamp information of the subsequent data packet, the sending device may generate the timestamp information of the subsequent data packet, or may not generate. If not generated, since the service is a periodic service, the scheduling device obtains the timestamp information of the first data packet. The timestamp information of the subsequent data packet can be derived according to the periodicity.
  • the absolute timestamp information can be based, for example, on Coordinated Universal Time (UTC).
  • the relative timestamp information may be the frame number and subframe number information of the system at which the data packet arrives, or the offset value calculated according to the system zero frame.
  • the sending device sends the timestamp information of the data packet to the scheduling device, for example, the timestamp information may be carried in the uplink scheduling request.
  • the scheduling device can determine the waiting delay value of the data packet according to the timestamp information of the data packet and the time of the received uplink scheduling request.
  • the UTC carried in the data packet represents the time information T1, and the scheduling device receives the uplink scheduling information world time T2, and the scheduling device obtains the waiting delay by using T2-T1.
  • the scheduling device needs to synchronize with the sending device. For example, if both the scheduling device and the sending device adopt the “World Time” synchronization mode, the scheduling device determines that “the uplink scheduling request is received”. At the moment, the world time information of the received uplink scheduling message is recorded according to the world time.
  • the first data packet arrives at time T1, and the service period is 20 ms.
  • the scheduling device can pre-allocate transmission resources of T1+20ms, T1+40ms, T1+60ms... for the transmitting device. In this case, the scheduling device only needs to know the first data packet. At the arrival time, since the arrival time of the subsequent data packet can be accurately estimated, the scheduling waiting delay can be completely eliminated.
  • the scheduling device may also read the delay estimation value for adjustment.
  • the sending device periodically sends the delay deviation information or the actual delay threshold to the scheduling device; or
  • the sending device sends the delay deviation information or the actual delay threshold to the scheduling device.
  • the delay deviation information indicates a deviation between the estimated delay and the actual network transmission delay.
  • the delay deviation information is equal to the difference between the delay estimate and the actual network transmission delay.
  • the network transmission delay is equal to the end-to-end transmission delay minus the air interface transmission delay.
  • the scheduling device adjusts the delay estimation value according to the delay deviation information from the sending device or the receiving device or the actual delay threshold.
  • the scheduling device sets an estimated delay value of the access point to the external network according to the service type or historical information.
  • IP Internet Protocol
  • the scheduler saves the actual delay saved by other terminals and the same target peer (for example, determining the target peer according to the target IP address) as the delay estimation value of the current communication.
  • the sending device calculates the actual data arrival delay threshold according to the actual data arrival situation. For example, the on-time arrival rate requirement of the terminal service is 99.9%, and the delay threshold of the arrival of 99.9% of the data packet is calculated according to the actual arrival data.
  • the event-triggered reporting and periodic reporting can be supported at the same time.
  • the reporting delay threshold deviation information or the actual delay threshold information is triggered immediately.
  • the mobility or communication mode of the terminal causes a major change in the actual data transmission path or the initial establishment of the service.
  • the scheduling device has a significant deviation from the delay estimate of the access point to the external network).
  • the sending device can periodically report the deviation information of the actual delay threshold and the delay threshold.
  • the actual delay threshold information measured by the sending device can also be reported periodically.
  • the scheduling device adjusts the delay estimation value of the access point to the external network according to the delay deviation information.
  • the scheduling device finds that the delay error is +1 ms, then the delay estimate is decremented by 1 ms; if the scheduling device finds that the delay error is -1 ms, then the delay estimate is +1 ms.
  • the scheduling device can determine the data packet transmission mode according to the air interface delay budget value of the data packet.
  • the scheduling device determines that the data packet is transmitted in a manner that can be retransmitted;
  • the scheduling device determines that the data packet is transmitted in a manner that cannot be retransmitted.
  • the method capable of retransmitting is that the scheduling transmitting device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • the reliability of the first transmission of the data packet is a set value.
  • the threshold can be set as needed. For example, the sum of the one-way one-time transmission delay and one-time retransmission delay can be used as a threshold, so that if the air interface delay budget value is less than the set threshold, a retransmission cannot be completed, so the determined transmission mode is a manner in which retransmission cannot be performed. On the other hand, if the air interface delay budget value is not less than the set threshold, the retransmission can be completed at least once, so the determined transmission mode is a manner in which retransmission can be performed.
  • the scheduling device can improve the air interface transmission reliability by multiplexing. If the air interface delay budget value for the current data packet is 12 ms, the air interface transmission process can allow one retransmission in addition to the initial transmission, and the reliability can reach 99.9% after one retransmission.
  • one-way multiple transmission may be performed, and each transmission may transmit a data packet in a transmission channel in space; or transmit data in a transmission channel in the frequency domain. package.
  • the scheduling device estimates the reliability performance that can be achieved by a single transmission according to the channel condition between the transmitting device and the receiving device.
  • the reliability control point of the single-channel uplink transmission of the air interface is controlled to a correct transmission probability of 99%, so that no feedback is given to the air interface. If the reliability is 99.999%, the device needs to perform at least three times of blind retransmission. Therefore, the scheduling device can directly schedule the transmitting end to perform three-way blind retransmission on the air interface.
  • MCS Modulation and Coding Scheme
  • the air interface delay budget value is large, for example, the air interface delay budget value supports retransmission with feedback (in the case of feedback, the transmitting device determines whether retransmission is needed according to the feedback information of the receiving device, so compared with the blind retransmission If a larger delay is introduced, the scheduling device can schedule the sending device to perform a single single transmission and fail in a single transmission. Schedule a retransmission.
  • the scheduling device can schedule the transmitting device to adopt blindness in retransmission.
  • the retransmission scheme improves the transmission reliability (for example, by scheduling three blind retransmissions to achieve a reliability of 99.999%).
  • the scheduling device can adopt the strategy of pursuing spectrum efficiency when scheduling initial transmission, including reducing the reliability requirement by increasing the MCS level, and setting the reliability point of the initial transmission to 90%, in the case of initial transmission failure.
  • the transmitting device can be scheduled to adopt a blind retransmission scheme to improve transmission reliability during retransmission (for example, by scheduling three blind retransmissions to achieve a reliability of 99.999%).
  • the resource efficiency will be 10 times that of 90%, so since it will be the first time If the reliability of the transmission is set to 90%, the reliability resource consumption will be greatly reduced to achieve 99%. In the worst case, the same is true, because resource consumption and reliability are not linear, but the average resource consumption is different.
  • each transmission may transmit data packets in multiple transmission channels in space; or in the frequency domain.
  • the data packet is transmitted in the transmission channel.
  • multiple single transmissions may be performed, that is, data packets are transmitted in multiple transmission channels in space; or data is transmitted in multiple transmission channels in the frequency domain. package.
  • the scheduling device can improve the transmission reliability by scheduling the sending device to use the multiplex transmission scheme.
  • the reliability is improved by spatial multiplexing.
  • the scheduling device schedules uplink transmission attempts of the plurality of receiving devices to the transmitting device to receive. Assuming that the reliability of single-channel transmission can reach 99%, the scheduling device attempts to receive uplink by scheduling at least three access points, which improves the reliability to 99.999%.
  • the reliability is improved by frequency domain multiplex transmission.
  • the data transmission reliability of the transmitting device on one carrier is 99%, and the scheduling device repeatedly transmits data on at least three unrelated carriers by scheduling the transmitting device, and the receiving device passes the data.
  • Three carriers are received to increase reliability to 99.999%.
  • the different carriers may be the same RAT type (for example, the carriers are all based on the LTE air interface), or may be different RAT types (the carrier includes the LTE air interface and the WLAN air interface).
  • the scheduling device can obtain the capability of the terminal, it can also determine whether to perform multiple single transmission according to the capability of the terminal.
  • the terminal can support multiple transmissions, you can choose to perform multiple single transmissions; otherwise, no multiple single transmissions are performed.
  • a single single transmission can also be performed, that is, the initial transmission can be in space.
  • the data packet is transmitted in one of the transmission channels; or the data packet is transmitted in one transmission channel in the frequency domain.
  • the scheduling device can schedule the terminal to adopt a single transmission scheme in the initial transmission to obtain better spectrum efficiency performance, and in the case of initial transmission failure, by scheduling the multiplexing scheme Improve the reliability of retransmissions.
  • the scheduling device adopts a strategy of pursuing spectrum efficiency when scheduling initial transmission, including reducing the reliability requirement by increasing the MCS level, including setting the reliability point of the initial transmission to 90%, and ensuring reliable retransmission in the case of initial transmission failure.
  • the scheduling device can schedule the terminal to increase the transmission reliability to 99.999% through the multiplex transmission scheme.
  • the scheduling device determines the air interface delay budget value of the data packet according to the service parameter corresponding to the executed service, and determines the air interface delay of the data packet according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter. Budget value.
  • the scheduling device determines the air interface delay budget value of the data packet according to the waiting delay value of the data packet, the estimated delay value, and the end-to-end delay requirement value in the service parameter;
  • the delay estimation value is an estimated delay value of the external network to the sending device.
  • the air interface delay budget value is equal to the end-to-end delay requirement value minus the waiting delay value minus the delay estimation value.
  • the waiting delay value of the embodiment of the present application is determined by the scheduling device according to the timestamp information of the data packet.
  • the sending device If the service is not a periodic service, the sending device generates timestamp information for each data packet.
  • the timestamp information here may be absolute timestamp information or relative timestamp information.
  • the sending device If the service is a periodic service, the sending device generates timestamp information for the first data packet, where the timestamp information may be absolute timestamp information or relative timestamp information. For the timestamp information of the subsequent data packet, the sending device may generate the timestamp information of the subsequent data packet, or may not generate. If not generated, since the service is a periodic service, the scheduling device obtains the timestamp information of the first data packet. The timestamp information of the subsequent data packet can be derived according to the periodicity.
  • the absolute timestamp information can be based, for example, on Coordinated Universal Time (UTC).
  • the relative timestamp information may be the frame number and subframe number information of the system at which the data packet arrives, or the offset value calculated according to the system zero frame.
  • the sending device sends the timestamp information of the data packet to the scheduling device, for example, the timestamp information may be carried in the uplink scheduling request.
  • the scheduling device can determine the waiting delay value of the data packet according to the timestamp information of the data packet and the time of the received uplink scheduling request.
  • the UTC carried in the data packet represents the time information T1, and the scheduling device receives the uplink scheduling information world time T2, and the scheduling device obtains the waiting delay by using T2-T1.
  • the scheduling device needs to synchronize the scheduling device and the sending device when determining the time for receiving the subsequent uplink scheduling request, for example, Both the scheduling device and the sending device adopt the "World Time" synchronization mode.
  • the scheduling device determines the time of receiving the uplink scheduling request, it records the world time information of the received uplink scheduling message according to the world time.
  • the scheduling device may also read the delay estimation value for adjustment.
  • the sending device periodically sends the delay deviation information or the actual delay threshold to the scheduling device; or
  • the sending device sends the delay deviation information or the actual delay threshold to the scheduling device.
  • the delay deviation information indicates a deviation between the estimated delay and the actual network transmission delay.
  • the scheduling device adjusts the delay estimation value according to the delay deviation information from the sending device or the receiving device or the actual delay threshold.
  • the scheduling device sets an estimated delay value of the access point to the external network according to the service type or historical information.
  • the scheduler saves the actual delay saved by other terminals and the same target peer (for example, determining the target peer according to the target IP address) as the delay estimation value of the current communication.
  • the sending device calculates the actual data arrival delay threshold according to the actual data arrival situation. For example, the on-time arrival rate requirement of the terminal service is 99.9%, and the delay threshold of the arrival of 99.9% of the data packet is calculated according to the actual arrival data.
  • the event-triggered reporting and periodic reporting can be supported at the same time.
  • the reporting delay threshold deviation information or the actual delay threshold information is triggered immediately.
  • the mobility or communication mode of the terminal causes a major change in the actual data transmission path or the initial establishment of the service.
  • the scheduling device has a significant deviation from the delay estimate of the access point to the external network).
  • the sending device can periodically report the deviation information of the actual delay threshold and the delay threshold.
  • the actual delay threshold information measured by the sending device can also be reported periodically.
  • the scheduling device adjusts the delay estimation value of the access point to the external network according to the delay deviation information.
  • the scheduling device finds that the delay error is +1 ms, then the delay estimate is decremented by 1 ms; if the scheduling device finds that the delay error is -1 ms, then the delay estimate is +1 ms.
  • the scheduling device can determine the data packet transmission mode according to the air interface delay budget value of the data packet.
  • the scheduling device determines that the data packet is transmitted in a manner that can be retransmitted;
  • the scheduling device determines that the data packet is transmitted in a manner that cannot be heavy. The way of passing.
  • the method capable of retransmitting is that the scheduling transmitting device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • the reliability of the first transmission of the data packet is a set value.
  • the threshold can be set as needed. For example, the sum of the one-way one-time transmission delay and one-time retransmission delay can be used as a threshold, so that if the air interface delay budget value is less than the set threshold, a retransmission cannot be completed, so the determined transmission mode is a manner in which retransmission cannot be performed. On the other hand, if the air interface delay budget value is not less than the set threshold, the retransmission can be completed at least once, so the determined transmission mode is a manner in which retransmission can be performed.
  • the scheduling device can improve the air interface transmission reliability by multiplexing. If the air interface delay budget value for the current data packet is 12 ms, the air interface transmission process can allow one retransmission in addition to the initial transmission, and the reliability can reach 99.9% after one retransmission.
  • one-way multiple transmission may be performed, and each transmission may transmit a data packet in a transmission channel in space; or transmit data in a transmission channel in the frequency domain. package.
  • the scheduling device estimates the reliability performance that can be achieved by a single transmission according to the channel condition between the transmitting device and the receiving device.
  • the reliability control point of the single-channel uplink transmission of the air interface is controlled to a correct transmission probability of 99%, so that no feedback is given to the air interface. If the reliability is 99.999%, the device needs to perform at least three times of blind retransmission. Therefore, the scheduling device can directly schedule the transmitting end to perform three-way blind retransmission on the air interface.
  • MCS Modulation and Coding Scheme
  • the air interface delay budget value is large, for example, the air interface delay budget value supports retransmission with feedback (in the case of feedback, the transmitting device determines whether retransmission is needed according to the feedback information of the receiving device, so compared with the blind retransmission
  • the scheduling device can schedule the transmitting device to perform single-channel single transmission first, and schedule retransmission in case of single-channel single transmission failure.
  • the scheduling device can schedule the transmitting device to adopt blindness in retransmission.
  • the retransmission scheme improves the transmission reliability (for example, by scheduling three blind retransmissions to achieve a reliability of 99.999%).
  • the scheduling device can adopt the strategy of pursuing spectrum efficiency when scheduling initial transmission, including reducing the reliability requirement by increasing the MCS level, and setting the reliability point of the initial transmission to 90%, in the case of initial transmission failure.
  • the transmitting device can be scheduled to adopt a blind retransmission scheme to improve transmission reliability during retransmission (for example, by scheduling three blind retransmissions to achieve a reliability of 99.999%).
  • the resource efficiency will be 10 times that of 90%, so since it will be the first time If the reliability of the transmission is set to 90%, the reliability resource consumption will be greatly reduced to achieve 99%. In the worst case, the same is true, because resource consumption and reliability are not linear, but the average resource consumption is different.
  • each transmission may transmit data packets in multiple transmission channels in space; or in the frequency domain.
  • the data packet is transmitted in the transmission channel.
  • multiple single transmissions may be performed, that is, data packets are transmitted in multiple transmission channels in space; or data is transmitted in multiple transmission channels in the frequency domain. package.
  • the scheduling device can improve the transmission reliability by scheduling the sending device to use the multiplex transmission scheme.
  • the reliability is improved by spatial multiplexing.
  • the scheduling device schedules uplink transmission attempts of the plurality of receiving devices to the transmitting device to receive. Assuming that the reliability of single-channel transmission can reach 99%, the scheduling device attempts to receive uplink by scheduling at least three access points, which improves the reliability to 99.999%.
  • the reliability is improved by frequency domain multiplex transmission.
  • the data transmission reliability of the transmitting device on one carrier is 99%, and the scheduling device repeatedly transmits data on at least three unrelated carriers by scheduling the transmitting device, and the receiving device passes the data.
  • Three carriers are received to increase reliability to 99.999%.
  • the different carriers may be the same RAT type (for example, the carriers are all based on the LTE air interface), or may be different RAT types (the carrier includes the LTE air interface and the WLAN air interface).
  • the scheduling device can obtain the capability of the terminal, it can also determine whether to perform multiple single transmission according to the capability of the terminal.
  • the terminal can support multiple transmissions, you can choose to perform multiple single transmissions; otherwise, no multiple single transmissions are performed.
  • a single single transmission may be performed, that is, the initial transmission may transmit a data packet in one transmission channel in space; or may transmit a data packet in one transmission channel in the frequency domain.
  • the scheduling device can schedule the terminal to adopt a single transmission scheme in the initial transmission to obtain better spectrum efficiency performance, and in the case of initial transmission failure, by scheduling the multiplexing scheme Improve the reliability of retransmissions.
  • the scheduling device adopts a strategy of pursuing spectrum efficiency when scheduling initial transmission, including reducing the reliability requirement by increasing the MCS level, including setting the reliability point of the initial transmission to 90%, and ensuring reliable retransmission in the case of initial transmission failure.
  • the scheduling device can schedule the terminal to increase the transmission reliability to 99.999% through the multiplex transmission scheme.
  • the scheduling device determines the air interface delay budget value of the data packet according to the service parameter corresponding to the executed service, and determines the air interface delay of the data packet according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter. Budget value.
  • the air interface delay budget value is equal to the end-to-end delay requirement value minus the waiting delay value.
  • the waiting delay value of the embodiment of the present application is determined by the scheduling device according to the timestamp information of the data packet.
  • the sending device If the service is not a periodic service, the sending device generates timestamp information for each data packet.
  • the timestamp information here may be absolute timestamp information or relative timestamp information.
  • the sending device If the service is a periodic service, the sending device generates timestamp information for the first data packet, where the timestamp information may be absolute timestamp information or relative timestamp information. For the timestamp information of the subsequent data packet, the sending device may generate the timestamp information of the subsequent data packet, or may not generate. If not generated, since the service is a periodic service, the scheduling device obtains the timestamp information of the first data packet. The timestamp information of the subsequent data packet can be derived according to the periodicity.
  • the absolute timestamp information can be based, for example, on Coordinated Universal Time (UTC).
  • the relative timestamp information may be the frame number and subframe number information of the system at which the data packet arrives, or the offset value calculated according to the system zero frame.
  • the sending device sends the timestamp information of the data packet to the scheduling device, for example, the timestamp information may be carried in the uplink scheduling request.
  • the scheduling device can determine the waiting delay value of the data packet according to the timestamp information of the data packet and the time of the received uplink scheduling request.
  • the UTC carried in the data packet represents the time information T1, and the scheduling device receives the uplink scheduling information world time T2, and the scheduling device obtains the waiting delay by using T2-T1.
  • the scheduling device needs to synchronize the scheduling device and the sending device, for example, the scheduling device, when determining the time for receiving the subsequent uplink scheduling request. Both the transmitting device and the transmitting device use the "World Time" synchronization mode.
  • the scheduling device determines the time of receiving the uplink scheduling request, it records the world time information of the received uplink scheduling message according to the world time.
  • the scheduling device determines that the data packet is transmitted in a manner that can be retransmitted;
  • the scheduling device determines that the data packet is transmitted in a manner that cannot be retransmitted.
  • the method capable of retransmitting is that the scheduling transmitting device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • the reliability of the first transmission of the data packet is a set value.
  • the threshold can be set as needed. For example, the sum of one-way transmission delay and one retransmission delay can be used as a threshold, so that if the air interface delay budget value is less than the set threshold, a retransmission cannot be completed, so the determined transmission mode is The method of retransmission cannot be performed; otherwise, if the air interface delay budget value is not less than the set threshold, the retransmission can be completed at least once, so the determined transmission mode is a manner capable of retransmission.
  • the scheduling device can improve the air interface transmission reliability by multiplexing. If the air interface delay budget value for the current data packet is 12 ms, the air interface transmission process can allow one retransmission in addition to the initial transmission, and the reliability can reach 99.9% after one retransmission.
  • one-way multiple transmission may be performed, and each transmission may transmit a data packet in a transmission channel in space; or transmit data in a transmission channel in the frequency domain. package.
  • the scheduling device estimates the reliability performance that can be achieved by a single transmission according to the channel condition between the transmitting device and the receiving device.
  • the reliability control point of the single-channel uplink transmission of the air interface is controlled to a correct transmission probability of 99%, so that no feedback is given to the air interface. If the reliability is 99.999%, the device needs to perform at least three times of blind retransmission. Therefore, the scheduling device can directly schedule the transmitting end to perform three-way blind retransmission on the air interface.
  • MCS Modulation and Coding Scheme
  • the air interface delay budget value is large, for example, the air interface delay budget value supports retransmission with feedback (in the case of feedback, the transmitting device determines whether retransmission is needed according to the feedback information of the receiving device, so compared with the blind retransmission
  • the scheduling device can schedule the transmitting device to perform single-channel single transmission first, and schedule retransmission in case of single-channel single transmission failure.
  • the scheduling device can schedule the transmitting device to adopt blindness in retransmission.
  • the retransmission scheme improves the transmission reliability (for example, by scheduling three blind retransmissions to achieve a reliability of 99.999%).
  • the scheduling device can adopt the strategy of pursuing spectrum efficiency when scheduling initial transmission, including reducing the reliability requirement by increasing the MCS level, and setting the reliability point of the initial transmission to 90%, in the case of initial transmission failure.
  • the transmitting device can be scheduled to adopt a blind retransmission scheme to improve transmission reliability during retransmission (for example, by scheduling three blind retransmissions to achieve a reliability of 99.999%).
  • the resource efficiency will be 10 times that of 90%, so since it will be the first time If the reliability of the transmission is set to 90%, the reliability resource consumption will be greatly reduced to achieve 99%. In the worst case, the same is true, because resource consumption and reliability are not linear, but the average resource consumption is different.
  • each transmission may transmit data packets in multiple transmission channels in space; or in the frequency domain. Transmission channel Transfer packets in.
  • multiple single transmissions may be performed, that is, data packets are transmitted in multiple transmission channels in space; or data is transmitted in multiple transmission channels in the frequency domain. package.
  • the scheduling device can improve the transmission reliability by scheduling the sending device to use the multiplex transmission scheme.
  • the reliability is improved by spatial multiplexing.
  • the scheduling device schedules uplink transmission attempts of the plurality of receiving devices to the transmitting device to receive. Assuming that the reliability of single-channel transmission can reach 99%, the scheduling device attempts to receive uplink by scheduling at least three access points, which improves the reliability to 99.999%.
  • the reliability is improved by frequency domain multiplex transmission.
  • the data transmission reliability of the transmitting device on one carrier is 99%, and the scheduling device repeatedly transmits data on at least three unrelated carriers by scheduling the transmitting device, and the receiving device passes the data.
  • Three carriers are received to increase reliability to 99.999%.
  • the different carriers may be the same RAT type (for example, the carriers are all based on the LTE air interface), or may be different RAT types (the carrier includes the LTE air interface and the WLAN air interface).
  • the scheduling device can obtain the capability of the terminal, it can also determine whether to perform multiple single transmission according to the capability of the terminal.
  • the terminal can support multiple transmissions, you can choose to perform multiple single transmissions; otherwise, no multiple single transmissions are performed.
  • a single single transmission may be performed, that is, the initial transmission may transmit a data packet in one transmission channel in space; or may transmit a data packet in one transmission channel in the frequency domain.
  • the scheduling device can schedule the terminal to adopt a single transmission scheme in the initial transmission to obtain better spectrum efficiency performance, and in the case of initial transmission failure, by scheduling the multiplexing scheme Improve the reliability of retransmissions.
  • the scheduling device adopts a strategy of pursuing spectrum efficiency when scheduling initial transmission, including reducing the reliability requirement by increasing the MCS level, including setting the reliability point of the initial transmission to 90%, and ensuring reliable retransmission in the case of initial transmission failure.
  • the scheduling device can schedule the terminal to increase the transmission reliability to 99.999% through the multiplex transmission scheme.
  • the first scheduling device in this embodiment of the present application includes:
  • the first determining module 200 is configured to determine, according to the service parameter corresponding to the service, the air interface delay budget value of the data packet for each data packet of the service, where the air interface delay budget value indicates that the corresponding data packet enters the sending device.
  • the maximum allowable delay between the MAC layer and the data packet being submitted from the receiving device MAC layer to the upper layer;
  • the second determining module 201 is configured to determine, according to the air interface delay budget value of the data packet, a data packet transmission manner
  • the scheduling module 202 is configured to schedule the sending device and the receiving device according to the determined transmission mode.
  • the first determining module 200 is specifically configured to:
  • the air interface delay budget value of the data packet is determined according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter.
  • the first determining module 200 is specifically configured to:
  • the delay estimation value is a delay estimation value of the receiving device to the external network; for downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the first determining module 200 is further configured to:
  • the delay estimate is adjusted based on the delay skew information from the transmitting device or the receiving device or the actual delay threshold.
  • the first determining module 200 is specifically configured to determine a waiting delay value of the data packet according to the following manner:
  • the waiting delay value of the data packet is determined according to the timestamp information of the data packet.
  • the timestamp information of the data packet is sent by the sending device
  • the timestamp information of the data packet is sent by the sending device, or the timestamp information of the data packet is based on the timestamp information of the first data packet sent by the sending device and received
  • the timestamp information of a packet is determined by the time.
  • the second determining module 201 is specifically configured to:
  • the air interface delay budget value is not less than the set threshold, it is determined that the data packet transmission mode is a manner capable of retransmission
  • the air interface delay budget value is less than the set threshold, it is determined that the data packet transmission mode is a manner in which retransmission cannot be performed.
  • the method capable of retransmitting is that the scheduling sending device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • each transmission transmits a data packet in at least one transmission channel in space; or transmits a data packet in at least one transmission channel in a frequency domain.
  • the method of retransmitting is not: when the initial transmission is performed, the data packet is transmitted in at least one transmission channel in the space; or the data packet is transmitted in the at least one transmission channel in the frequency domain.
  • the first sending device in this embodiment of the present application includes:
  • the third determining module 300 is configured to determine timestamp information of the data packet for each data packet of the service
  • the notification module 301 is configured to notify the scheduling device of the timestamp information, so that the scheduling device determines the air interface delay budget value of the data packet according to the timestamp information of the data packet, and determines the data packet according to the air interface delay budget value of the data packet.
  • the transmission mode of the air interface delay; the air interface delay budget value indicates the maximum allowed delay of the corresponding data packet entering the sending device MAC layer to the data packet being submitted from the receiving device MAC layer to the upper layer;
  • the transmission module 302 is configured to transmit a data packet according to a transmission manner determined by the scheduling device.
  • the air interface delay budget value of the data packet is determined by the scheduling device according to the waiting delay value of the data packet, the delay estimation value, and the end-to-end delay requirement value in the service parameter of the service;
  • the delay estimation value is a delay estimation value of the receiving device to the external network; for downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the third determining module 300 is further configured to:
  • the period sends the delay deviation information or the actual delay threshold to the scheduling device, so that the scheduling device adjusts the delay estimation value according to the delay deviation information;
  • the delay deviation information or the actual delay threshold is sent to the scheduling device, so that the scheduling device adjusts the delay estimation value according to the delay deviation information;
  • the delay deviation information indicates a deviation between the estimated delay and the actual network transmission delay.
  • the scheduling device of the embodiment of the present application may be embedded in a sending device or a receiving device.
  • the transmission device in the embodiment of the present application is a terminal, and the transmission device in the embodiment of the present application is an access point.
  • the second scheduling device in this embodiment of the present application includes:
  • the processor 401 is configured to read a program in the memory 404 and perform the following process:
  • the air interface delay budget value of the data packet is determined according to the service parameter corresponding to the service, where the air interface delay budget value indicates that the corresponding data packet enters the sending device MAC layer to the data packet from the receiving device.
  • the MAC layer is submitted to the maximum allowed delay between the upper layers; the transmission mode of the data packet is determined according to the air interface delay budget value of the data packet; and the transmitting device and the receiving device are scheduled by the transceiver 402 according to the determined transmission mode.
  • the transceiver 402 is configured to receive and transmit data under the control of the processor 401.
  • the processor 401 is specifically configured to:
  • the air interface delay budget value of the data packet is determined according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter.
  • the processor 401 is specifically configured to:
  • the delay estimation value is a delay estimation value of the receiving device to the external network; for downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the processor 401 is further configured to:
  • the delay estimate is adjusted based on the delay skew information from the transmitting device or the receiving device or the actual delay threshold.
  • the processor 401 is specifically configured to determine a waiting delay value of the data packet according to the following manner:
  • the waiting delay value of the data packet is determined according to the timestamp information of the data packet.
  • the timestamp information of the data packet is sent by the sending device
  • the timestamp information of the data packet is sent by the sending device, or the timestamp information of the data packet is based on the timestamp information of the first data packet sent by the sending device and received
  • the timestamp information of a packet is determined by the time.
  • the processor 401 is specifically configured to:
  • the air interface delay budget value is not less than the set threshold, it is determined that the data packet transmission mode is a manner capable of retransmission
  • the air interface delay budget value is less than the set threshold, it is determined that the data packet transmission mode is a manner in which retransmission cannot be performed.
  • the method capable of retransmitting is that the scheduling sending device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • each transmission transmits a data packet in at least one transmission channel in space; or transmits a data packet in at least one transmission channel in a frequency domain.
  • the method of not being able to retransmit is to transmit a data packet in at least one transmission channel of the initial transmission or to transmit the data packet in at least one transmission channel in the frequency domain.
  • bus 400 may include any number of interconnected buses and bridges, and bus 400 will include one or more processors represented by processor 401 and memory represented by memory 404.
  • the various circuits are linked together.
  • the bus 400 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art and, therefore, will not be further described herein.
  • Bus interface 403 provides an interface between bus 400 and transceiver 402.
  • Transceiver 402 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium.
  • the data processed by the processor 401 is transmitted over the wireless medium via the antenna 405. Further, the antenna 405 also receives the data and transmits the data to the processor 401.
  • the processor 401 is responsible for managing the bus 400 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the memory 404 can be used to store data used by the processor 401 in performing operations.
  • the processor 401 can be a central buried device (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device ( Complex Programmable Logic Device, CPLD).
  • CPU central buried device
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • CPLD complex programmable logic device
  • the second sending device in this embodiment of the present application includes:
  • the processor 501 is configured to read a program in the memory 504 and perform the following process:
  • the data packet transmission mode is determined according to the air interface delay budget value of the data packet; wherein the air interface delay budget value indicates that the corresponding data packet enters the sending device MAC layer to the maximum allowable time when the data packet is submitted from the receiving device MAC layer to the upper layer.
  • the data packet is transmitted through the transceiver 502 according to the transmission mode determined by the scheduling device.
  • the transceiver 502 is configured to receive and transmit data under the control of the processor 501.
  • the air interface delay budget value of the data packet is determined by the scheduling device according to the waiting delay value of the data packet, the delay estimation value, and the end-to-end delay requirement value in the service parameter of the service;
  • the delay estimation value is a delay estimation value of the receiving device to the external network; if the downlink transmission is used, the delay estimation value is an estimated delay value of the external network to the sending device.
  • processor 501 is further configured to:
  • the period sends the delay deviation information or the actual delay threshold to the scheduling device, so that the scheduling device adjusts the delay estimation value according to the delay deviation information;
  • the delay deviation information or the actual delay threshold is sent to the scheduling device, so that the scheduling device adjusts the delay estimation value according to the delay deviation information;
  • the delay deviation information indicates a deviation between the estimated delay and the actual network transmission delay.
  • bus 500 can include any number of interconnected buses and bridges, and bus 500 will include one or more processors represented by processor 501 and memory represented by memory 504. The various circuits are linked together. The bus 500 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein.
  • Bus interface 503 provides an interface between bus 500 and transceiver 502. Transceiver 502 can be an element or a plurality of elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium. Data processed by processor 501 is transmitted over wireless medium via antenna 505. Further, antenna 505 also receives the data and transmits the data to processor 501.
  • the processor 501 is responsible for managing the bus 500 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the memory 504 can be used to store data used by the processor 501 when performing operations.
  • the processor 501 can be a CPU, an ASIC, an FPGA, or a CPLD.
  • the scheduling device of the embodiment of the present application may be embedded in a sending device or a receiving device.
  • the transmission device in the embodiment of the present application is a terminal, and the transmission device in the embodiment of the present application is an access point.
  • a method for performing scheduling is also provided in the embodiment of the present application.
  • the device corresponding to the method is a device in a system for scheduling in the embodiment of the present application, and the principle of the method for solving the problem is similar to the system. Therefore, the implementation of the method can be referred to the implementation of the system, and the repeated description will not be repeated.
  • the method for scheduling in this embodiment of the present application includes:
  • Step 601 For each data packet of the executed service, the scheduling device determines the air interface delay budget value of the data packet according to the service parameter corresponding to the service, where the air interface delay budget value indicates that the corresponding data packet enters the MAC layer of the sending device. The maximum allowed delay of the data packet from the receiving device MAC layer to the upper layer;
  • Step 602 The scheduling device determines, according to the air interface delay budget value of the data packet, a data packet transmission manner.
  • Step 603 The scheduling device schedules the sending device and the receiving device according to the determined transmission mode.
  • the scheduling device determines the air interface delay budget value of the data packet according to the service parameter corresponding to the performed service, including:
  • the scheduling device determines the air interface delay budget value of the data packet according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter.
  • the scheduling device determines the air interface delay budget value of the data packet according to the waiting delay value of the data packet and the end-to-end delay requirement value in the service parameter, including:
  • the scheduling device determines the air interface delay budget value of the data packet according to the waiting delay value of the data packet, the estimated delay value, and the end-to-end delay requirement value in the service parameter;
  • the delay estimation value is a delay estimation value of the receiving device to the external network; for downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the method before the scheduling device determines the air interface delay budget value of the data packet, the method further includes:
  • the scheduling device adjusts the delay estimation value according to the delay deviation information from the transmitting device or the receiving device or the actual delay threshold.
  • the scheduling device determines the waiting delay value of the data packet according to the following manner:
  • the scheduling device determines the waiting delay value of the data packet according to the timestamp information of the data packet.
  • the timestamp information of the data packet is sent by the sending device
  • the timestamp information of the data packet is sent by the sending device, or the timestamp information of the data packet is based on the timestamp information of the first data packet sent by the sending device and received
  • the timestamp information of a packet is determined by the time.
  • the scheduling device determines, according to the air interface delay budget value of the data packet, how the data packet is transmitted, including:
  • the scheduling device determines that the data packet is transmitted in a manner that can be retransmitted;
  • the scheduling device determines that the data packet is transmitted in a manner that cannot be retransmitted.
  • the method capable of retransmitting is that the scheduling sending device performs the first transmission for the data packet, and performs retransmission after the transmission fails.
  • each transmission transmits a data packet in at least one transmission channel in space; or transmits a data packet in at least one transmission channel in a frequency domain.
  • the method of not being able to retransmit is to transmit a data packet in at least one transmission channel of the initial transmission or to transmit the data packet in at least one transmission channel in the frequency domain.
  • the method for scheduling in this embodiment of the present application includes:
  • Step 701 For each data packet of the service, the sending device determines timestamp information of the data packet.
  • Step 702 The sending device notifies the scheduling device to the timestamp information, so that the scheduling device determines the air interface delay budget value of the data packet according to the timestamp information of the data packet, and determines the data packet according to the air interface delay budget value of the data packet.
  • the transmission mode wherein the air interface delay budget value indicates the maximum allowed delay of the corresponding data packet entering the sending device MAC layer to the data packet being submitted from the receiving device MAC layer to the upper layer;
  • Step 703 The sending device transmits the data packet according to the transmission mode determined by the scheduling device.
  • the air interface delay budget value of the data packet is determined by the scheduling device according to the waiting delay value of the data packet, the delay estimation value, and the end-to-end delay requirement value in the service parameter of the service;
  • the delay estimation value is a delay estimation value of the receiving device to the external network; for downlink transmission, the delay estimation value is a delay estimation value of the external network to the sending device.
  • the method before the sending device transmits the data packet according to the transmission mode determined by the scheduling device, the method further includes:
  • the sending device periodically sends the delay deviation information or the actual delay threshold to the scheduling device, so that the scheduling device adjusts the delay estimation value according to the delay deviation information; or
  • the sending device sends the delay deviation information or the actual delay threshold to the scheduling device, so that the scheduling device adjusts the delay estimation value according to the delay deviation information.
  • the delay deviation information indicates a deviation between the estimated delay and the actual network transmission delay.
  • Example 1 Uplink transmission scheduling scheme.
  • the method for uplink transmission in this embodiment of the present application includes:
  • Step 1 During the establishment of the service, the scheduling device saves the semi-static service parameters for the service.
  • the semi-static service parameters include but are not limited to some or all of the following:
  • End-to-end delay threshold requirements delay estimation of uplink data from the access point to the external network, service transmission reliability requirements, and service characteristic information (periodic service and its cycle time length, bursty service).
  • the scheduling device may obtain corresponding semi-static service parameters from the terminal, or the access point or the core network, during the establishment of the service session.
  • the scheduling device may further save the terminal capability in advance, and determine a transmission scheme according to the capability of the terminal.
  • the capability of the terminal here mainly refers to whether the terminal supports multiplexing technology, including multi-carrier parallel transmission.
  • Step 2 After the data packet arrives at the terminal MAC layer, the MAC layer generates a timestamp information item for the data packet.
  • the timestamp information item may carry absolute timestamp information or relative timestamp information.
  • the absolute timestamp information can be based, for example, on Coordinated Universal Time (UTC).
  • UTC Coordinated Universal Time
  • Relative timestamp information which may be the frame number of the system at which the packet arrives And the sub-frame number information or the offset value calculated according to the system zero frame.
  • Step 3 The terminal sends an uplink scheduling request to the scheduling device, where the packet timestamp information is carried.
  • Step 4 The scheduling device determines the air interface delay budget value according to the end-to-end delay requirement.
  • the air interface delay budget value is equal to the end-to-end delay threshold minus the waiting delay value of the data packet, and then the delay estimation value of the access point to the external network is subtracted.
  • the scheduling device calculates the maximum number of transmissions of the air interface and determines the corresponding transmission scheme. For example, if the air interface delay budget value of the current data packet is 5 ms (assuming that the performance index of the current air interface is 4 ms for one-way transmission delay, 99% reliability, 8 ms for one retransmission delay, and 99.9% reliability). ).
  • the scheduling device can improve the air interface transmission reliability by multiplexing. If the air interface delay budget for the current data packet is 12 ms, the air interface transmission process can allow one retransmission in addition to the initial transmission, and the reliability can reach 99.9% after one retransmission, so the scheduling device can schedule the terminal to pass the air interface.
  • the way of the road is initially transmitted.
  • the initial transmission and the retransmission can adopt different transmission schemes, for example, the initial transmission adopts a single transmission scheme with a reliability of 90%, and the reliability is adopted in retransmission.
  • a 99.9% multiplex scheme is achieved, which reduces the reliability requirements of the initial transmission, and can greatly improve the utilization efficiency of the radio resources (the reliability of the air interface transmission is increased by one order of magnitude, which usually means a sharp drop in spectrum efficiency).
  • Step 5 The scheduling device sends scheduling information of the initial transmission (including retransmission if retransmission is allowed) to the terminal.
  • the scheduling information includes a transmission mode (for example, single channel transmission or multiplex transmission) used for initial transmission (including retransmission if retransmission is allowed), transmission parameters (such as MCS level used for transmission), and radio resource allocation (transmission occupancy). Information about the location of wireless resources in the time domain and frequency domain). For the service feature that meets the periodic feature service, the scheduling device may also configure pre-scheduling information for the subsequent periodically arrived data packets according to the timestamp information and the service period information of the data packet, which may reduce the data packet waiting delay, and On the one hand, the delay introduced by the scheduling process is eliminated.
  • a transmission mode for example, single channel transmission or multiplex transmission
  • transmission parameters such as MCS level used for transmission
  • radio resource allocation transmission occupancy
  • Step 6 The scheduling device sends scheduling information for the terminal to the access point.
  • Step 7 The terminal performs uplink data transmission according to the scheduling information indication.
  • Example 2 Downlink transmission scheduling scheme.
  • the method for downlink transmission in this embodiment of the present application includes:
  • Step 1 During the establishment of the service, the scheduling device saves the semi-static service parameters for the service.
  • the semi-static service parameters include but are not limited to some or all of the following:
  • End-to-end delay threshold requirements delay estimation of downlink data from the external network to the access point, service transmission reliability requirements, and service characteristic information (periodic service and its cycle time length, bursty service).
  • the scheduling device may obtain corresponding semi-static service parameters from the terminal, or the access point or the core network, during the establishment of the service session.
  • the scheduling device may further save the terminal capability in advance, and determine a transmission scheme according to the capability of the terminal.
  • the capability of the terminal here mainly refers to whether the terminal supports multiplexing technology, including multi-carrier parallel transmission.
  • Step 2 After the data packet arrives at the access point, the access point generates a timestamp information item for the data packet.
  • the timestamp information item may carry absolute timestamp information or relative timestamp information.
  • the absolute timestamp information can be based, for example, on Coordinated Universal Time (UTC).
  • the relative timestamp information may be the frame number and subframe number information of the system at the time of arrival of the data packet or the offset value calculated according to the zero frame of the system.
  • Step 3 The access point sends a downlink scheduling request to the scheduling device, where the packet timestamp information is carried.
  • Step 4 The scheduling device determines the air interface delay budget value according to the end-to-end delay requirement.
  • the air interface delay budget is equal to the end-to-end delay minus threshold requirement minus the packet waiting delay (the scheduling device calculates the data packet waiting delay according to the data packet timestamp information and the time information of receiving the scheduling request), and then subtracts Estimation of the delay from the external network to the access point. After obtaining the budget of the air interface delay, combined with the transmission reliability requirement (the packet arrival rate is 99.9), the scheduling device calculates the maximum number of transmissions of the air interface and determines the corresponding transmission scheme. For example, if the air interface delay budget value of the current data packet is 5 ms (assuming that the performance index of the current air interface is 4 ms for one-way transmission delay, 99% reliability, 8 ms for one retransmission delay, and 99.9% reliability).
  • the scheduling device can improve the air interface transmission reliability by multiplexing. If the air interface delay budget for the current data packet is 12 ms, the air interface transmission process can allow one retransmission in addition to the initial transmission, and the reliability can reach 99.9% after one retransmission, so the scheduling device can schedule the terminal to pass the air interface. The way of the road is initially transmitted. In addition, in the case where the air interface transmission delay budget value allows retransmission, the initial transmission and the retransmission can adopt different transmission schemes, for example, the initial transmission adopts a single transmission scheme with a reliability of 90%, and the reliability is adopted in retransmission. A 99.9% multiplex scheme is achieved, which reduces the reliability requirements of the initial transmission, and can greatly improve the utilization efficiency of the radio resources (the reliability of the air interface transmission is increased by one order of magnitude, which usually means a sharp drop in spectrum efficiency).
  • Step 5 The scheduling device sends scheduling information of the initial transmission (including retransmission if retransmission is allowed) to the terminal.
  • the scheduling information includes a transmission mode (for example, single channel transmission or multiplex transmission) used for initial transmission (including retransmission if retransmission is allowed), transmission parameters (such as MCS level used for transmission), and radio resource allocation (transmission occupancy).
  • the wireless resources are transmitted to the terminal in the time domain and the frequency domain.
  • Step 6 The scheduling device sends scheduling information for the terminal to the access point.
  • the scheduling device may also configure pre-scheduling information for the subsequent periodically arrived data packets according to the timestamp information and the service period information of the data packet, which may reduce the data packet waiting delay, and On the one hand, the delay introduced by the scheduling process is eliminated.
  • Step 7 The access point performs downlink data transmission according to the scheduling information indication.
  • Example 3 Direct transmission scheduling scheme between terminals.
  • the method for transmitting between terminals in this embodiment of the present application includes:
  • Step 1 During the establishment of the service, the scheduling device saves the semi-static service parameters for the service.
  • the semi-static service parameters include but are not limited to some or all of the following:
  • End-to-end delay threshold requirements service transmission reliability requirements, and service characteristic information (periodic services and their cycle length, bursty services).
  • the scheduling device may obtain corresponding semi-static service parameters from the terminal, or the access point or the core network, during the establishment of the service session.
  • the scheduling device also needs to save the terminal capability in advance in order to determine the transmission scheme.
  • Step 2 After the data packet arrives at the terminal MAC layer, the MAC generates a timestamp information item for the data packet.
  • the timestamp information item may carry absolute timestamp information or relative timestamp information.
  • the absolute timestamp information can be based, for example, on Coordinated Universal Time (UTC).
  • the relative timestamp information may be the frame number and subframe number information of the system at the time of arrival of the data packet or the offset value calculated according to the zero frame of the system.
  • Step 3 The terminal sends a D2D communication scheduling request to the scheduling device, where the packet timestamp information is carried.
  • Step 4 The scheduling device determines the air interface delay budget according to the end-to-end delay requirement.
  • the air interface delay budget value is equal to the end-to-end delay threshold requirement minus the packet waiting delay.
  • the scheduling device calculates the maximum number of transmissions of the air interface and determines the corresponding transmission scheme. For example, if the air interface delay budget value of the current data packet is 5 ms (assuming that the performance index of the current air interface is 4 ms for one-way transmission delay, 99% reliability, 8 ms for one retransmission delay, and 99.9% reliability). ). Based on the above-mentioned air interface performance index parameters, since the air interface can only allow one transmission at a time, the scheduling device can improve the air interface transmission reliability by multiplexing.
  • the air interface transmission process can allow one retransmission in addition to the initial transmission, and the reliability can reach 99.9% after one retransmission, so the scheduling device can schedule the terminal to pass the air interface.
  • One-way mode for initial transmission in the case where the air interface transmission delay budget value allows retransmission, the initial transmission and the retransmission can adopt different transmission schemes, for example, the initial transmission adopts a single transmission scheme with a reliability of 90%, and the reliability is adopted in retransmission.
  • a 99.9% multiplex scheme is achieved, which reduces the reliability requirements of the initial transmission, and can greatly improve the utilization efficiency of the radio resources (the reliability of the air interface transmission is increased by one order of magnitude, which usually means a sharp drop in spectrum efficiency).
  • Step 5 The scheduling device sends scheduling information of the initial transmission (including retransmission if retransmission is allowed) to the transmitting terminal.
  • the scheduling information includes a transmission mode (such as single transmission or multiplex transmission) used for initial transmission (including retransmission if retransmission is allowed), transmission parameters (such as MCS level used for transmission), and radio resource allocation (transmission occupation). Location information of the wireless resources in the time domain and the frequency domain). For the service feature that meets the periodic feature service, the scheduling device may also configure pre-scheduling information for the subsequent periodically arrived data packets according to the timestamp information and the service period information of the data packet, which may reduce the data packet waiting delay, and On the one hand, the delay introduced by the scheduling process is eliminated.
  • a transmission mode such as single transmission or multiplex transmission
  • transmission parameters such as MCS level used for transmission
  • radio resource allocation transmission occupation
  • Step 6 The transmitting terminal sends a scheduling indication and performs data packet transmission on the D2D link according to the scheduling information received from the scheduling device.
  • the receiving terminal receives the data packet transmission according to the scheduling instruction from the transmitting terminal means.
  • Example 4 The delay budget estimation adjustment scheme of the terminal-assisted access point to the external network.
  • the scheduling device may have a certain delay in the delay of the data packet from the access point to the external network. Therefore, the scheduling device may calculate the actual delay of the access point to the external network according to the end-to-end delay statistics reported by the terminal (here considered The delay from the access point to the external network may change. For example, the mobility of the terminal itself or the mobility of the actual communication peer may affect this part of the delay, but the reason for this effect is due to the mobility of the two parties. Caused by). Therefore, it is a relatively slow process, so the update of the delay estimation of the access point to the external network by the scheduling device is also a relatively slow process).
  • the method for adjusting the delay budget estimation in the embodiment of the present application includes:
  • Step 1 After the service starts, the scheduling device sets an estimated value for the access point to the external network delay according to the service type or historical information.
  • the scheduling device may determine, according to the session information of the terminal, or the IP address information used by the data packet, whether the current terminal is in direct communication between the terminals, whether to communicate with the local network or with the remote network.
  • the scheduling device When the scheduling device generates the actual delay estimation value for the current terminal, the scheduling device may refer to the delay estimation value of other terminals that have previously accessed the network.
  • Step 2 The terminal calculates the actual data arrival delay threshold according to the actual data arrival situation. For example, the on-time arrival rate requirement of the terminal service is 99.9%, and the terminal calculates the delay threshold of 99.9% of the data packet arrival according to the actual arrival data.
  • Step 3 The trigger mechanism for reporting the delay threshold deviation value supports both event-triggered reporting and periodic reporting.
  • the event triggering report is mainly used for the actual delay threshold of the terminal statistics. Once the delay threshold is exceeded, the terminal can immediately violate the delay threshold deviation information reporting process (for example, the mobility or communication mode of the terminal causes a significant change in the actual data transmission path or When the service establishment initial scheduling device has a significant deviation from the delay estimation of the access point to the external network). Periodic reporting can help the scheduling device collect the need for information collection functions that satisfy the delay threshold.
  • the terminal can offset the actual delay threshold and the delay threshold, or directly report the actual delay threshold measured by the terminal.
  • Step 4 The scheduling device adjusts the delay estimation of the access point to the external network according to the delay deviation value.
  • the scheduling device reduces the delay estimation value of the original access point to the external network by 1 ms;
  • the scheduling device calculates the delay of the original access point to the external network by +1 ms and recalculates the data packet air interface transmission delay after the access point to the external network delay estimation update. budget.
  • the air interface delay budget value of the data packet is determined according to the service parameter corresponding to the executed service, and the data is determined according to the air interface delay budget value of the data packet.
  • the transmission mode of the packet, and the transmitting device and the receiving device are scheduled according to the determined transmission mode. Since the embodiment of the present application determines the transmission mode by using the data packet as the granularity, the service with relatively high delay requirement can be satisfied.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Les modes de réalisation de la présente invention concernent le domaine technique des communications sans fil, et en particulier un procédé et un dispositif de planification, qui sont utilisés pour résoudre le problème existant dans l'état de la technique selon lequel un mode de planification actuel ne peut pas satisfaire un service avec une exigence de retard supérieure. Dans les modes de réalisation de la présente invention, pour chaque paquet de données d'un service, une valeur de retard d'interface hertzienne estimée du paquet de données est déterminée selon un paramètre de service correspondant au service exécuté ; un mode de transmission du paquet de données est déterminé en fonction de la valeur de retard d'interface hertzienne estimée du paquet de données ; et un dispositif d'envoi et un dispositif de réception sont planifiés selon le mode de transmission déterminé. Étant donné que dans les modes de réalisation de la présente invention, un mode de transmission est déterminé en prenant un paquet de données en tant que granularité, un service avec une exigence de retard supérieure peut être satisfait.
PCT/CN2016/079058 2015-06-04 2016-04-12 Procédé et dispositif de planification WO2016192466A1 (fr)

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