CN110677188A - Dynamic adjusting method, sending method and device for air interface speed limit of satellite communication - Google Patents
Dynamic adjusting method, sending method and device for air interface speed limit of satellite communication Download PDFInfo
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- CN110677188A CN110677188A CN201910901066.0A CN201910901066A CN110677188A CN 110677188 A CN110677188 A CN 110677188A CN 201910901066 A CN201910901066 A CN 201910901066A CN 110677188 A CN110677188 A CN 110677188A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
- H04L47/263—Rate modification at the source after receiving feedback
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- H—ELECTRICITY
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- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
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Abstract
The application provides a dynamic adjusting method, a sending method and a device for an air interface speed limit of satellite communication. According to the feedback of FIFO interruption, dynamically adjusting the current outlet speed limit of the transmission layer, and sending service data to the link layer FIFO according to the current outlet speed limit so as to enable the link layer FIFO to perform FIFO interruption; wherein, the FIFO interruption means that the empty line interruption/full line interruption is fed back or the interruption is not fed back according to the length of the cache data in the current FIFO queue; the dynamic adjustment comprises the following steps: the minimum speed limit is set first and then adjusted according to the FIFO interruption. And after the dynamic adjustment method is finished, sending the data to the outside. The dynamic adjusting device comprises a QoS dynamic adjusting module and an FIFO interruption module, and the sending device comprises a receiving module, a dynamic adjusting module and a sending module. By implementing the method and the device, the maximum sending rate of the outlet in the current service state can be accurately calculated to be adjusted, so that the waste of the bandwidth of the empty outlet is avoided while the high-priority message is guaranteed.
Description
Technical Field
The invention relates to a satellite communication technology, in particular to a dynamic adjusting method, a sending method and a device for an air interface speed limit of satellite communication.
Background
In a satellite communication network, since the link layer needs to re-encode the ethernet packet, the encoding will re-encapsulate the ethernet packet, and therefore redundant information needs to be added to the ethernet packet.
For example: the maximum sending rate of the link layer is 100, the redundancy of 10 bytes needs to be added to the Ethernet message package, and the actual maximum sending rate of the 64-byte Ethernet message is 64/(64 +10) approximately equal to 86.49; the actual maximum sending rate of the Ethernet message with 1500 bytes is 1500/(1500+10) ≈ 99.34.
Since it is difficult to predict the length of the ethernet packet transmitted by the user at the next stage, the above behavior brings many uncertain factors to the Quality of Service (QoS) export speed limit.
Currently, the queue speed limit and priority scheduling of QoS are implemented in the transport layer. When the queue is congested, the low priority message can be discarded to ensure the transmission of the high priority message. If the transmission layer speed limit is higher than the actual transmission capability of the link layer, the random packet loss of the link layer occurs, and the transmission of the high-priority queue service cannot be guaranteed; if the transmission layer speed limit is lower than the actual transmission capability of the link layer, bandwidth waste is caused.
Disclosure of Invention
The application mainly aims at the defects of the related prior art, and provides a dynamic adjusting method, a sending method and a device for the air interface speed limit of satellite communication, which can accurately calculate to adjust the maximum sending rate of an outlet in the current service state, thereby avoiding the waste of the bandwidth of the air interface while guaranteeing high-priority messages.
In order to achieve the above object, the present invention employs the following techniques:
a dynamic adjusting method for air interface speed limit of satellite communication is characterized by comprising the following steps:
according to the feedback of FIFO interruption, dynamically adjusting the current outlet speed limit of the transmission layer, and sending service data to the link layer FIFO according to the current outlet speed limit so as to enable the link layer FIFO to perform FIFO interruption;
the FIFO interruption means that empty line interruption/full line interruption is fed back or interruption is not fed back according to the length of the cache data in the current FIFO queue.
Further, the FIFO interruption means:
when the unsent data in the FIFO is less than 20% of the total size of the FIFO, feeding back the empty pipeline interruption;
when the unsent data in the FIFO is larger than 80% of the total size of the FIFO, feeding back the full waterline interrupt;
when the data not sent in the FIFO is between 20% ~ 80% of the total size of the FIFO, no interrupt is fed back.
Further, the dynamic adjustment comprises the steps of:
setting the current exit speed limit of the transmission layer as the minimum speed limit of the transmission layer;
adjusting according to the interrupt feedback of the FIFO:
if the feedback of FIFO interruption is empty water line interruption, increasing the speed limit of the current outlet of the transmission layer by a step value delta t;
if the feedback of FIFO interruption is full waterline interruption, adjusting the current exit speed limit of the transmission layer to the minimum speed limit of the transmission layer;
judging whether the current exit speed limit of the transmission layer is greater than the maximum speed limit of the transmission layer:
if the maximum speed limit is larger than the maximum speed limit of the transmission layer, setting the maximum speed limit of the transmission layer as the current exit speed limit of the transmission layer;
and if the output speed limit is not greater than the maximum speed limit of the transmission layer, taking the output speed limit adjusted according to the interrupt feedback of the FIFO as the current output speed limit of the transmission layer.
The maximum speed limit of a transmission layer = the maximum speed limit of a link layer x the maximum Ethernet message length/(the maximum Ethernet message length + the link layer redundant information length); the minimum speed limit of a transmission layer = the maximum speed limit of a link layer x the shortest ethernet message length/(the shortest ethernet message length + the link layer redundant information length); step value Δ t = (transport layer maximum speed limit — transport layer minimum speed limit)/20.
A method for sending an air interface speed limit in satellite communication is characterized by comprising the following steps:
receiving service data generated by a user host;
carrying out speed limit adjustment on the sending of the service data by the satellite communication air interface speed limit dynamic adjustment method;
and after the adjustment is finished, the service data is sent outwards at the adjusted speed limit.
A dynamic adjusting device for air interface speed limit of satellite communication is characterized by comprising:
the QoS dynamic adjusting module is used for dynamically adjusting the current outlet speed limit of the transmission layer according to the feedback of FIFO interruption and sending service data to the FIFO of the link layer at the current outlet speed limit;
and the FIFO interruption module is used for feeding back FIFO interruption to the QoS dynamic adjustment module by means of empty pipeline interruption/full pipeline interruption or not according to the length of the cache data in the current FIFO queue.
Further, the FIFO interrupt module includes:
the buffer judging unit is used for judging the percentage of the unsent data in the current FIFO in the total size of the FIFO;
the first feedback unit is used for feeding back the interruption of the empty water line when the cache judging unit judges that the unsent data in the FIFO is less than 20 percent of the total size of the FIFO;
the second feedback unit is used for feeding back the interruption of the full waterline when the cache judging unit judges that the unsent data in the FIFO is larger than 80 percent of the total size of the FIFO;
when the cache judging unit judges that the data which is not sent in the FIFO is between 20% ~ 80% of the total size of the FIFO, the FIFO interruption module does not feed back the interruption.
Further, the QoS dynamic adjustment module includes:
the initialization unit is used for setting the current exit speed limit of the transmission layer as the minimum speed limit of the transmission layer;
a feedback adjustment unit, configured to adjust according to the interrupt feedback of the FIFO:
if the feedback of FIFO interruption is empty water line interruption, increasing the speed limit of the current outlet of the transmission layer by a step value delta t;
if the feedback of FIFO interruption is full waterline interruption, adjusting the current exit speed limit of the transmission layer to the minimum speed limit of the transmission layer;
and the judgment and adjustment unit is used for judging whether the current exit speed limit of the transmission layer is greater than the maximum speed limit of the transmission layer:
if the maximum speed limit is larger than the maximum speed limit of the transmission layer, setting the maximum speed limit of the transmission layer as the current exit speed limit of the transmission layer;
and if the output speed limit is not greater than the maximum speed limit of the transmission layer, taking the output speed limit adjusted according to the interrupt feedback of the FIFO as the current output speed limit of the transmission layer.
Further, the QoS dynamic adjustment module further includes:
the calculation unit is used for calculating the maximum speed limit of the transmission layer, the minimum speed limit of the transmission layer and the stepping value delta t through the following formulas;
maximum speed limit of a transmission layer = maximum speed limit of a link layer × maximum ethernet message length/(maximum ethernet message length + link layer redundancy information length);
the minimum speed limit of a transmission layer = the maximum speed limit of a link layer x the shortest ethernet message length/(the shortest ethernet message length + the link layer redundant information length);
step value Δ t = (transport layer maximum speed limit — transport layer minimum speed limit)/20.
A satellite communication air interface speed limit sending device is characterized by comprising:
the receiving module is used for receiving the service data generated by the user host;
the satellite communication air interface speed limit dynamic adjusting device is used for adjusting the speed limit of the service data transmitted by the receiving module; and
and the sending module is used for sending the service data outwards at the adjusted speed limit after the satellite communication air interface speed limit dynamic adjusting device finishes adjustment.
The invention has the beneficial effects that:
the dynamic adjustment of the current exit speed limit of the transmission layer is realized by the dynamic adjustment of the QoS speed limit of the transmission layer and the reaction/interruption strategy of the FIFO of the link layer; wherein FIFO interruption is performed by judging the ratio of the length of the buffered data in the current queue to the unsent data in the current FIFO, orWithout feedback interruption, the method acts on the QoS speed limit dynamic adjustment to effectively adjust the Scur to the Smin or increase the ScurΔtAnd the maximum speed is limited by judging Scur and Smax, so that the maximum sending speed of a service QoS (quality of service) outlet in the current service state can be accurately calculated to adjust, dynamic speed limit adjustment is realized, and the waste of the bandwidth of an idle outlet is avoided while high-priority messages are guaranteed.
Drawings
Fig. 1 is a diagram illustrating a network structure of the device in the present application.
Fig. 2 is a flowchart of an embodiment of a dynamic air interface speed limit adjustment method according to the present application.
Fig. 3 is a schematic diagram of a FIFO interruption strategy in an embodiment of a dynamic air interface speed limit adjustment method according to the present application.
Fig. 4 is a flowchart illustrating a QoS dynamic adjustment step in an embodiment of a dynamic air interface speed limit adjustment method according to the present application.
Fig. 5 is a flowchart of an embodiment of an air interface speed limit sending method according to the present application.
Fig. 6 is a service data flow chart of an embodiment of a method for dynamically adjusting an air interface speed limit and a method for sending the same according to the present application.
Fig. 7 is a structural diagram of an embodiment of an air interface speed limit dynamic adjustment apparatus according to the present application.
Fig. 8 is a structural diagram of an embodiment of a FIFO interrupt module of the air interface speed limit dynamic adjustment device according to the present application.
Fig. 9 is a structural diagram of an embodiment of a QoS dynamic adjustment module of an air interface speed limit dynamic adjustment apparatus according to the present application.
Fig. 10 is a structural diagram of an embodiment of an air interface speed limit sending apparatus according to the present application.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Noun/name refers to description:
QoS: quality of Service, providing queue speed limit and priority scheduling functions.
FIFO: first Input First Output, First in First out queue.
S: link layer maximum speed limit.
Smin: transport layer minimum rate limit.
Smax: the maximum speed limit of the transmission layer.
Lmin: the shortest ethernet packet length.
Lmax: maximum ethernet packet length.
And Lred: length of link layer redundancy information.
Scur: and limiting the current exit speed of the transmission layer.
Δ t: the speed limit is increased by a step value, the typical value of which = (Smax-Smin)/20.
Fig. 1 shows an application environment of the technical means of the present application.
The user host generates service data, sends the service data to the sending equipment in an Ethernet message form, and transmits the Ethernet message through a satellite link and receives the Ethernet message by related receiving equipment after being processed by the dynamic adjusting method, the sending method, the dynamic adjusting device and the sending device in the sending equipment.
Fig. 6 is a service data flow chart of an embodiment of a method and a method for dynamically adjusting an air interface speed limit according to the present application.
Specifically, after receiving the service data, the sending device performs dynamic adjustment of the air interface speed limit and sends the service data, as shown in fig. 5, which is a flowchart of an embodiment of the air interface speed limit sending method according to the present application.
First, service data generated by a subscriber host is received.
And then, carrying out speed limit adjustment on the transmission of the service data. Specifically, as shown in fig. 2, a flowchart of an embodiment of the air interface speed limit dynamic adjustment method according to the present application is shown.
The specific dynamic adjustment steps are as follows:
the transmission layer adjusts the sending speed limit by adopting a QoS speed limit dynamic policy for the received service data, and the implementation manner can be as shown in fig. 3:
1) calculating the maximum and minimum speed limits of a transmission layer according to the maximum speed, the maximum and minimum message lengths of the link layer outlet and the length of the link layer redundant information;
specifically, Smin = S × Lmin/(Lmin + Lred);
Smax=S×Lmax /(Lmax+Lred)
2) the QoS initial speed limit adopts the minimum transmission layer speed limit;
3) monitoring FIFO interruption, and dynamically adjusting the current exit speed limit of the transmission layer according to the feedback of the FIFO interruption:
FIFO full interruption, and the current outlet speed limit Scur is adjusted to Smin;
FIFO empty interruption, increasing the current outlet speed limit Scur by delta t;
the step value Δ t = (Smax-Smin)/20.
The FIFO interruption processing strategy refers to feeding back an empty pipeline interruption/full pipeline interruption or not feeding back an interruption according to the length of the cache data in the current FIFO queue.
As a specific embodiment, as shown in fig. 4, the FIFO interrupt includes:
when the unsent data in the FIFO is less than 20% of the total size of the FIFO, feeding back the empty pipeline interruption;
when the unsent data in the FIFO is larger than 80% of the total size of the FIFO, feeding back the full waterline interrupt;
when the data not sent in the FIFO is between 20% ~ 80% of the total size of the FIFO, no interrupt is fed back.
4) And judging whether the Scur is larger than Smax, and if so, judging that the Scur = Smax. If the output speed limit is not larger than the current output speed limit of the transmission layer, the output speed limit adjusted according to the interrupt feedback of the FIFO is taken as the current output speed limit of the transmission layer.
Through the steps, the dynamic adjustment is completed.
And finally, after the adjustment is finished, the service data is sent outwards at the adjusted speed limit, and the implementation of the air interface speed limit sending method is finished.
Fig. 7 is a structural diagram of an embodiment of an air interface speed limit dynamic adjustment apparatus according to the present application.
The concrete structure includes: a QoS dynamic adjusting module and a FIFO interruption module.
The QoS dynamic adjusting module is used for dynamically adjusting the current outlet speed limit of the transmission layer according to the feedback of FIFO interruption and sending service data to the FIFO of the link layer at the current outlet speed limit;
and the FIFO interruption module is used for feeding back FIFO interruption to the QoS dynamic adjustment module by means of empty pipeline interruption/full pipeline interruption or not according to the length of the cache data in the current FIFO queue.
As a specific embodiment, as shown in fig. 8, the FIFO interrupt module structurally includes a buffer determination unit, a first feedback unit, and a second feedback unit.
And the buffer judgment unit is used for judging the percentage of the data which is not sent in the current FIFO in the total size of the FIFO.
And the first feedback unit is used for feeding back the empty pipeline interrupt when the cache judging unit judges that the unsent data in the FIFO is less than 20 percent of the total size of the FIFO.
And the second feedback unit is used for feeding back the interruption of the full waterline when the cache judging unit judges that the unsent data in the FIFO is larger than 80 percent of the total size of the FIFO.
When the cache judging unit judges that the data which is not sent in the FIFO is between 20% ~ 80% of the total size of the FIFO, the FIFO interruption module does not feed back the interruption.
As a specific embodiment, a structure of the QoS dynamic adjustment module according to a specific embodiment is shown in fig. 9.
The specific structure comprises an initialization unit, a feedback adjustment unit, a judgment adjustment unit and a calculation unit.
The calculation unit is used for calculating the maximum and minimum speed limits of the transmission layer according to the maximum speed, the maximum and minimum message lengths of the link layer outlet and the length of the link layer redundant information; wherein Smin = sxlmin/(Lmin + Lred); smax = sxlmax/(Lmax + Lred); and calculates a step value deltat according to the formula deltat = (Smax-Smin)/20.
The initialization unit is used for setting the QoS initial speed limit as the minimum transmission layer speed limit;
and the feedback adjusting unit is used for monitoring FIFO interruption and dynamically adjusting the current exit speed limit of the transmission layer according to the feedback of the FIFO interruption:
FIFO full interruption, and the current outlet speed limit Scur is adjusted to Smin;
FIFO empty interruption, increasing the current outlet speed limit Scur by delta t;
the judging and adjusting unit is used for judging whether the Scur is larger than Smax or not, and if the Scur is larger than Smax, the Scur = Smax; if the output speed limit is not larger than the current output speed limit of the transmission layer, the output speed limit adjusted according to the interrupt feedback of the FIFO is taken as the current output speed limit of the transmission layer.
Fig. 8 is a structural diagram of an embodiment of an air interface speed limit sending apparatus according to the present application.
The concrete structure includes: the air interface speed limit dynamic adjusting device comprises a receiving module, a sending module and an air interface speed limit dynamic adjusting device connected between the receiving module and the sending module.
As specific examples:
and the receiving module is used for receiving the service data generated by the user host.
The air interface speed limit dynamic adjustment device adopts the structure of the embodiment shown in fig. 6, and is used for performing speed limit adjustment on the service data transmitted by the receiving module.
And the sending module is used for sending the service data outwards at the adjusted speed limit after the air interface speed limit dynamic adjusting device finishes adjustment.
Claims (10)
1. A dynamic adjusting method for air interface speed limit of satellite communication is characterized by comprising the following steps:
according to the feedback of FIFO interruption, dynamically adjusting the current outlet speed limit of the transmission layer, and sending service data to the link layer FIFO according to the current outlet speed limit so as to enable the link layer FIFO to perform FIFO interruption;
the FIFO interruption means that empty line interruption/full line interruption is fed back or interruption is not fed back according to the length of the cache data in the current FIFO queue.
2. The dynamic adjustment method for air interface speed limit of satellite communication according to claim 1, characterized in that,
the FIFO interruption means that:
when the unsent data in the FIFO is less than 20% of the total size of the FIFO, feeding back the empty pipeline interruption;
when the unsent data in the FIFO is larger than 80% of the total size of the FIFO, feeding back the full waterline interrupt;
when the data not sent in the FIFO is between 20% ~ 80% of the total size of the FIFO, no interrupt is fed back.
3. The dynamic adjustment method for air interface speed limit of satellite communication according to claim 1, characterized in that,
the dynamic adjustment comprises the following steps:
setting the current exit speed limit of the transmission layer as the minimum speed limit of the transmission layer;
adjusting according to the interrupt feedback of the FIFO:
if the feedback of FIFO interruption is empty water line interruption, increasing the speed limit of the current outlet of the transmission layer by a step value delta t;
if the feedback of FIFO interruption is full waterline interruption, adjusting the current exit speed limit of the transmission layer to the minimum speed limit of the transmission layer;
judging whether the current exit speed limit of the transmission layer is greater than the maximum speed limit of the transmission layer:
if the maximum speed limit is larger than the maximum speed limit of the transmission layer, setting the maximum speed limit of the transmission layer as the current exit speed limit of the transmission layer;
and if the output speed limit is not greater than the maximum speed limit of the transmission layer, taking the output speed limit adjusted according to the interrupt feedback of the FIFO as the current output speed limit of the transmission layer.
4. The dynamic adjustment method for air interface speed limit of satellite communication according to claim 3, characterized in that:
maximum speed limit of a transmission layer = maximum speed limit of a link layer × maximum ethernet message length/(maximum ethernet message length + link layer redundancy information length);
the minimum speed limit of a transmission layer = the maximum speed limit of a link layer x the shortest ethernet message length/(the shortest ethernet message length + the link layer redundant information length);
step value Δ t = (transport layer maximum speed limit — transport layer minimum speed limit)/20.
5. A method for sending an air interface speed limit in satellite communication is characterized by comprising the following steps:
receiving service data generated by a user host;
performing speed limit adjustment on the sending of the service data by using the dynamic adjustment method for air interface speed limit of satellite communication according to any one of claims 1 ~ 4;
and after the adjustment is finished, the service data is sent outwards at the adjusted speed limit.
6. A dynamic adjusting device for air interface speed limit of satellite communication is characterized by comprising:
the QoS dynamic adjusting module is used for dynamically adjusting the current outlet speed limit of the transmission layer according to the feedback of FIFO interruption and sending service data to the FIFO of the link layer at the current outlet speed limit;
and the FIFO interruption module is used for feeding back FIFO interruption to the QoS dynamic adjustment module by means of empty pipeline interruption/full pipeline interruption or not according to the length of the cache data in the current FIFO queue.
7. The dynamic adjustment device for air interface speed limit of satellite communication according to claim 6, wherein,
the FIFO interrupt module, comprising:
the buffer judging unit is used for judging the percentage of the unsent data in the current FIFO in the total size of the FIFO;
the first feedback unit is used for feeding back the interruption of the empty water line when the cache judging unit judges that the unsent data in the FIFO is less than 20 percent of the total size of the FIFO;
the second feedback unit is used for feeding back the interruption of the full waterline when the cache judging unit judges that the unsent data in the FIFO is larger than 80 percent of the total size of the FIFO;
when the cache judging unit judges that the data which is not sent in the FIFO is between 20% ~ 80% of the total size of the FIFO, the FIFO interruption module does not feed back the interruption.
8. The dynamic adjustment device for air interface speed limit of satellite communication according to claim 6, wherein,
the QoS dynamic adjustment module includes:
the initialization unit is used for setting the current exit speed limit of the transmission layer as the minimum speed limit of the transmission layer;
a feedback adjustment unit, configured to adjust according to the interrupt feedback of the FIFO:
if the feedback of FIFO interruption is empty water line interruption, increasing the speed limit of the current outlet of the transmission layer by a step value delta t;
if the feedback of FIFO interruption is full waterline interruption, adjusting the current exit speed limit of the transmission layer to the minimum speed limit of the transmission layer;
and the judgment and adjustment unit is used for judging whether the current exit speed limit of the transmission layer is greater than the maximum speed limit of the transmission layer:
if the maximum speed limit is larger than the maximum speed limit of the transmission layer, setting the maximum speed limit of the transmission layer as the current exit speed limit of the transmission layer;
and if the output speed limit is not greater than the maximum speed limit of the transmission layer, taking the output speed limit adjusted according to the interrupt feedback of the FIFO as the current output speed limit of the transmission layer.
9. The dynamic adjustment device for air interface speed limit of satellite communication according to claim 8, wherein,
the QoS dynamic adjustment module further includes:
the calculation unit is used for calculating the maximum speed limit of the transmission layer, the minimum speed limit of the transmission layer and the stepping value delta t through the following formulas;
maximum speed limit of a transmission layer = maximum speed limit of a link layer × maximum ethernet message length/(maximum ethernet message length + link layer redundancy information length);
the minimum speed limit of a transmission layer = the maximum speed limit of a link layer x the shortest ethernet message length/(the shortest ethernet message length + the link layer redundant information length);
step value Δ t = (transport layer maximum speed limit — transport layer minimum speed limit)/20.
10. A satellite communication air interface speed limit sending device is characterized by comprising:
the receiving module is used for receiving the service data generated by the user host;
the dynamic satellite communication air interface speed limit adjustment device of any one of claims 6 ~ 9, configured to perform speed limit adjustment on service data transmitted by the receiving module, and the sending module, configured to send the service data outwards at the adjusted speed limit after the dynamic satellite communication air interface speed limit adjustment device completes adjustment.
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