CN114257363B - Logic channel allocation method based on very high frequency data exchange system - Google Patents
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Abstract
The invention relates to the technical field of offshore and satellite communication, and provides a logic channel allocation method based on a very high frequency data exchange system. The invention predicts the number of the ship stations applying for the resources in each time division multiple access frame in the future one minute by counting the number of the ship stations applying for the resources in the past period of time on the basis of a very high frequency data exchange system, and transmits satellite bulletin board signaling through the bulletin board signaling channel. The invention can dynamically adjust the size of the time slot occupied by the logic channel in the time division multiple access frame, thereby realizing the high-efficiency utilization of time slot resources, expanding the communication capacity of the very high frequency data exchange system and increasing the number of terminals which can be served by the very high frequency data exchange system.
Description
Technical Field
The present invention relates generally to the field of offshore and satellite communications technology. In particular, the invention relates to a logical channel allocation method based on a very high frequency data exchange system.
Background
With the increasing demand for VHF (Very high frequency ) data communication at sea, AIS (Automatic Identification System ) has been widely used in offshore security, offshore situation awareness, port security, etc. But the AIS is highly loaded on both frequency bands AIS1 and AIS2, thus requiring an additional VHF data channel.
VDES (VHF Data Exchange System, very high frequency data exchange system) is an offshore broadband digital communication system developed to meet the e-navigation strategy ship-to-ship, ship-to-shore data exchange needs of IMO (International Maritime Organization ) initiative.
The VDES introduces the concept of a logical channel through the mapping of slots for AIS application requirements for additional VHF data channels. Functionally, the logical channels may include data logical channels for data transmission and signaling logical channels for signaling information. However, in the prior art, the VDES easily generates a large amount of time slot waste in the time slot function allocation process of the logical channel, and the resource utilization rate of the system needs to be improved.
Disclosure of Invention
To at least partially solve the above-mentioned problems in the prior art, the present invention provides a channel allocation method based on a vhf data exchange system, comprising the steps of:
configuring an initialization value, wherein the initialization value comprises a configuration access rate threshold η Threshold value Time slot utilization threshold lambda Threshold value Service satisfaction rate threshold ρ Threshold value Default value of station number a 0 A first data channel value 15k;
determining an occupied time slot of a logic channel in a first frame according to the initialization value and broadcasting a first time division multiple access frame structure;
determining an actual numerical value after a first period, wherein the actual numerical value comprises an average of the number a of ship stations transmitting resource applications in each time division multiple access frame, an average of the actual successful access rate eta, the actual time slot utilization rate lambda and the actual service satisfaction rate rho of the system per minute;
comparing the actual value with the initialization value and updating the first data channel value 15k according to the comparison result to obtain a second data channel value 15k'; and
and determining the occupied time slot of the logic channel in the second frame according to the actual value and the second data channel value 15k' and broadcasting a second time division multiple access frame structure.
In one embodiment of the invention, the logical channels include a bulletin board signaling channel, a random access signaling channel, a notification signaling channel, a data channel, and a data signaling channel. In one embodiment of the invention, it is provided that satellite bulletin board signaling is transmitted by the bulletin board signaling channel, wherein the satellite bulletin board signaling broadcasts a time division multiple access frame structure.
In one embodiment of the invention, it is provided that the notification signal channels are allocated to the data channelsThe number of ship stations is denoted b, the number of occupied time slots of the random access signaling channel is denoted 5a, and the number of occupied time slots of the announcement signaling channel is denotedThe number of occupied slots of the data channel is denoted 15kb, the number of occupied slots of the data signaling channel is denoted 5b, wherein +.>
In one embodiment of the invention, the actual successful access rate η of the system per minute is expressed as:
in one embodiment of the invention, the slot utilization λ of the system per minute is expressed as:
where c represents the number of time slots actually occupied by the station transmitting data in one minute.
In one embodiment of the invention, it is provided that determining the service satisfaction rate ρ of the system per minute comprises the steps of:
determining a priority threshold p Threshold value ；
Determining that the service priority per minute is greater than or equal to p Threshold value Is expressed as m;
determining that the priority of the service is greater than or equal to p Threshold value The number of time slots required for actually transmitting data is less than or equal to the number of the ship stations of the time slot occupied by one data channel, and is expressed as n; and
the service satisfaction rate ρ of the per minute system is expressed as:
in one embodiment of the present invention, the first period is f minutes, where f is a positive integer greater than or equal to 1, and indicates a dynamic adjustment frequency of the logical channel.
In one embodiment of the invention, it is provided that when ρ < ρ Threshold value The second data channel value 15k' is then valued by:
k∈{1，2，3，4，5，6}；
when ρ is greater than or equal to ρ Threshold value And when one of the actual successful access rate η and the actual time slot utilization rate λ is smaller than a threshold value, the second data channel value 15k' is valued by the following formula: k' =max (k-1, 1); and
when ρ is greater than or equal to ρ Threshold value If the actual successful access rate η and the actual time slot utilization rate λ are both smaller than the threshold, the second data channel value 15k' is valued by the following formula: k' =max (k-2, 1).
In one embodiment of the invention, it is provided that the above steps are cycled.
The invention has at least the following beneficial effects: the invention predicts the number of the ship stations applying for the resources in each time division multiple access frame in the future one minute by counting the number of the ship stations applying for the resources in the past period of time on the basis of a very high frequency data exchange system, and transmits satellite bulletin board signaling through the bulletin board signaling channel. The invention can dynamically adjust the size of the time slot occupied by the logic channel in the time division multiple access frame, thereby realizing the high-efficiency utilization of time slot resources, expanding the communication capacity of the very high frequency data exchange system and increasing the number of terminals which can be served by the very high frequency data exchange system.
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To further clarify the advantages and features present in various embodiments of the present invention, a more particular description of various embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, for clarity, the same or corresponding parts will be designated by the same or similar reference numerals.
Fig. 1 is a flow chart illustrating a logic channel allocation method based on a vhf data exchange system according to an embodiment of the present invention.
Detailed Description
It should be noted that the components in the figures may be shown exaggerated for illustrative purposes and are not necessarily to scale. In the drawings, identical or functionally identical components are provided with the same reference numerals.
In the present invention, unless specifically indicated otherwise, "disposed on …", "disposed over …" and "disposed over …" do not preclude the presence of an intermediate therebetween. Furthermore, "disposed on or above" … merely indicates the relative positional relationship between the two components, but may also be converted to "disposed under or below" …, and vice versa, under certain circumstances, such as after reversing the product direction.
In the present invention, the embodiments are merely intended to illustrate the scheme of the present invention, and should not be construed as limiting.
In the present invention, the adjectives "a" and "an" do not exclude a scenario of a plurality of elements, unless specifically indicated.
It should also be noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that the components or assemblies may be added as needed for a particular scenario under the teachings of the present invention. In addition, features of different embodiments of the invention may be combined with each other, unless otherwise specified. For example, a feature of the second embodiment may be substituted for a corresponding feature of the first embodiment, or may have the same or similar function, and the resulting embodiment would fall within the disclosure or scope of the disclosure.
It should also be noted herein that, within the scope of the present invention, the terms "identical", "equal" and the like do not mean that the two values are absolutely equal, but rather allow for some reasonable error, that is, the terms also encompass "substantially identical", "substantially equal". By analogy, in the present invention, the term "perpendicular", "parallel" and the like in the table direction also covers the meaning of "substantially perpendicular", "substantially parallel".
The numbers of the steps of the respective methods of the present invention are not limited to the order of execution of the steps of the methods. The method steps may be performed in a different order unless otherwise indicated.
The invention is further elucidated below in connection with the embodiments with reference to the drawings.
In a VDES, one frame is1 minute long, and one frame can be divided into 2250 slots, where each slot takes 26.6667ms, and for 2250 slots of each frame, slots with the same function are grouped into one logical channel.
Depending on the system operation and transmission procedure, the logical channels in a VDES typically include: bulletin board signaling channels (Bulletin Board Signaling Channel, BBSC), random access signaling channels (Random Access Signaling Channel, RAC), announcement signaling channels (Announcement Signaling Channel, ASC), data channels (Data channels, DC), and Data signaling channels (Data Signaling Channel, DSCH).
The first 90 slots of each frame are BBSC logical channels that can transmit satellite bulletin board SBB (Satellite Bulletin Board) signaling. The remaining 2160 timeslots may be divided into three groups, with each group having 720 timeslots referred to as a TDMA frame. The satellite defines the type of logical channel contained in each TDMA frame and the number of time slots occupied by each logical channel in the SBB signaling. RAC, ASC, DC and DSCH logical channels are included in each TDMA frame.
The logical channels are described below:
the Bulletin Board Signaling Channel (BBSC) may broadcast key data related to data transmission, such as MMSI (Maritime Mobile Service Identity, offshore mobile service identifier) number, TBB version number, logical channel type and number of occupied time slots, physical channel definition, modulation decoding mode, and the like.
The Random Access Channel (RAC) may be used by the ship station for requesting resource allocation or short data message transmission. When a ship station uses VDES for data communication, it is necessary to send a resource request signaling to a network through an RAC, and sign messages such as an MMSI number and the number of applied time slots in the request signaling. In addition, RAC may be used when the ship station transmits a burst of short messages.
The slots in the Announcement Signaling Channel (ASC) are typically reserved to satellites for request, allocation or single slot data transmission. After receiving the resource request signaling of the ship station, the satellite sends a resource allocation signaling packet to the corresponding ship station, and allocates a data transmission time slot to the corresponding ship station by marking the MMSI number of the receiving end, and the satellite can also be used for notifying the ship station that the satellite occupies a data channel to broadcast data.
The Data Channel (DC) is dedicated to satellite or station transmission of data packets.
The time slots in the Data Signaling Channel (DSCH) are reserved for acknowledgement, resource allocation and resource de-allocation of DC in the same TDMA (Time division multiple access time division multiple access) channel. The data receiving end can utilize DSCH to transmit ACK/NACK and resource allocation signaling packet, wherein the ACK/NACK signaling packet is marked with the important information such as MMSI number of the receiving end, DS number of the TDMA frame, lost data packet number in the DS, channel quality parameter, transmission power and the like.
In one embodiment of the invention, the shipyard competes for time slots in the RAC logical channel in a random access mode, and sends resource application messages to the satellite, wherein each resource application message occupies 5 time slots. After receiving the resource application messages of a plurality of shipyards, the satellite transmits a resource allocation message in an ASC time slot, allocates data DC channels to all or part of shipyards, and also allocates downlink DC channels to the satellite. Each resource allocation message occupies 15 time slots, and channels can be allocated to 4 shipyards or satellites. The station or satellite assigned to the DC channel waits for the arrival of the DC channel, and data is transmitted to the satellite or station in the corresponding DC channel.
After the satellite has transmitted the data downstream, the station may be required to return data acknowledgement ACK (Acknowledgement) signaling, at which time the station may send ACK signaling on the DSCH channel, each transmission occupying 5 time slots, where the number of DSCH occupied time slots should be the number of DC channels x 5.
Table 1 shows the slot function allocation of one VDES.
TABLE 1
As shown in table 1, there may be 179 RAC time slots in each TDMA frame, which in an ideal case may receive resource applications for 35 shipments, where each shipstation may occupy 5 time slots to transmit resource applications. However, there are only 6 data channels, so that the resource allocation message can be sent to at most 6 stations by the ASC, and the satellite can be allocated to 4 stations by sending the resource allocation message once, which usually takes 15 time slots, so that the ASC has 30 time slots occupied to send the resource allocation message, and the remaining 60 time slots will be wasted. Similarly, when the data channel is allocated to the ship station for use, taking the ship station allocated to the data channel DC4 as an example, there are 90 time slots in DC4, and the ship station only occupies 10 time slots to transmit a small amount of data, which would result in 80 time slots being wasted and also reduce the communication capacity of the system.
Accordingly, in one embodiment of the present invention, logical channels may be dynamically allocated to increase resource utilization. Among these, the following aspects can be considered:
assuming that the satellite occupies a DC channel for downlink data transmission and that the RAC channel has no collision, the number of stations for resource application on the RAC channel may be denoted as a, the number of stations allocated to the DC channel in the ASC channel may be denoted as b (where each station is allocated a DC channel), and the number of slots occupied by each DC channel may be denoted as 15k. The number of slots occupied by RAC is denoted as 5a, and the number of slots occupied by ASC is denoted asThe number of slots occupied by the DC channel is denoted 15kb and the number of slots occupied by the dsch channel is denoted 5b. Since each TDMA frame occupies 720 time slots, there is a relationship:
since not every station applying for resources at the RAC can allocate a DC channel at the ASC, the successful access rate in one minute can be expressed as:
i.e. < ->
The number of time slots occupied by each DC channel can be classified into 6 levels, denoted as k E {1,2,3,4,5,6}, the size of the DC channel is mainly determined by the amount of data to be transmitted by the ship station, and the larger the amount of data to be transmitted, the higher the k value. However, the magnitude of the k value also affects the successful access rate eta of the ship stations, because the larger the k is, the more DC time slots are allocated to each ship station, and the smaller the corresponding ship station number is allocated to a DC channel, the smaller the eta value is; conversely, the smaller the k value, the fewer the number of DC slots each station is assigned to, and the greater the corresponding number of stations assigned to the DC channel, the greater the η value.
Meanwhile, the situation that the station applying for resources at the RAC is fewer, and the data volume to be transmitted by each ship is smaller is likely to occur, so that the successful access rate eta of the system is higher, but the utilization rate of the data time slot is very low, so that the gap utilization rate within one minute can be expressed as the following formula:
i.e. < ->
Where c represents the number of time slots actually occupied by the station transmitting data in one minute. When the time slot utilization rate is lower, the number of time slots allocated to the ship stations exceeds the number of time slots actually required by the ship stations, so that the number of time slots of each data channel can be properly reduced, the number of data channels is increased, and time slot resources are allocated to more ship stations.
However, if each data channel is too small, resources may not be allocated for a long time for a ship station of high priority that needs to transmit a large amount of data. In order to meet the business scene with high priority and large data volume, a priority threshold value is set as p Threshold value Counting service priority of more than or equal to p per minute Threshold value (the priority value ranges from 1 to 255, and the higher the value is, the higher the priority is). Setting the service priority of more than or equal to p per minute Threshold value In the m stations, the number of time slots required for actually transmitting data is less than or equal to the number of time slots occupied by one data channel, and the number of stations is n, the service satisfaction rate of the system in one minute is set as follows:
service satisfaction rate:
when the service satisfaction rate is smaller than the threshold value rho Threshold value When the data channel capacity needs to be properly increased, the demand of the station business with high priority and large data volume is met.
Since the satellite transmits the SBB message in 90 slots at the beginning of each minute, the type and size of the logical channel in 3 TDMA frames within the current 1 minute are defined, so the frequency of dynamic allocation of the logical channel of the VDE is adjusted 1 time at the fastest time of 1 minute, the dynamic adjustment frequency of the logical channel is set to f (unit: min/time), f is a positive integer greater than or equal to 1, the value can be changed according to the actual situation, if the number of shipments applying for the resource is not greatly changed, the value of f can be properly increased, and if the number of shipments applying for the resource is greatly changed, the value of f can be properly reduced.
As shown in fig. 1, the process of performing logical channel allocation in one embodiment of the present invention may include:
configuring an initialization value, wherein the initialization value comprises a configuration access rate threshold η Threshold value Time slot utilization threshold lambda Threshold value Service satisfaction rate threshold ρ Threshold value Default value of station number a 0 A first data channel value 15k;
determining an occupied time slot of a logic channel in a first frame according to the initialization value and broadcasting a first time division multiple access frame structure;
determining an actual numerical value after a first period, wherein the actual numerical value comprises an average of the number a of ship stations transmitting resource applications in each time division multiple access frame, an average of the actual successful access rate eta, the actual time slot utilization rate lambda and the actual service satisfaction rate rho of the system per minute;
comparing the actual value with the initialization value and updating the first data channel value 15k according to the comparison result to obtain a second data channel value 15k'; and
and determining the occupied time slot of the logic channel in the second frame according to the actual value and the second data channel value 15k' and broadcasting a second time division multiple access frame structure.
Specifically, the following steps may be included:
step one: initialization of
Inputting a threshold value including a success access rate threshold value eta Threshold value Time slot utilization threshold lambda Threshold value Service satisfaction rate threshold ρ Threshold value ；
Inputting initial value, wherein default value a of number of ship stations for resource application is sent in RAC in each TDMA frame 0 The size of each data channel may be 15k, and the k default may be 3, k e {1,2,3,4,5,6}.
The satellite can be according to a 0 、k、η Threshold value The number of occupied time slots of the RAC, ASC, DC, DSCH channel in the TDMA frame is calculated, wherein the calculation result is rounded down. The TDMA frame structure is broadcast in an SBB message.
Step two: after f minutes, the average was calculated from satellite statisticsThe number a of ship stations transmitting the resource application in each TDMA frame, the actual successful access rate eta, the time slot utilization rate lambda and the service satisfaction rate rho of the average system per minute, and judging whether the actual service satisfaction rate is smaller than a threshold value or not if rho is smaller than rho Threshold value And executing the third step, otherwise executing the fourth step.
Step three: changing the data channel size to 15k' where
The satellite calculates the number of occupied time slots of RAC, ASC, DC, DSCH channels in the TDMA frame according to a, k', eta, and broadcasts the TDMA frame structure in the next SBB message.
Judging whether the actual successful access rate eta and the time slot utilization rate lambda are smaller than a threshold value, and if only one of the two values is smaller than the threshold value, changing the size of a data channel to 15k ', wherein k' =max (k-1, 1); if both values are smaller than the threshold, the data channel size is changed to 15k ', where k' =max (k-2, 1).
The satellite then calculates the number of occupied slots of RAC, ASC, DC, DSCH channels in the TDMA frame from a, k', η. The TDMA frame structure is broadcast in the next SBB message.
Step five, the steps one to four are circulated to finish the dynamic allocation of the VDE logical channels.
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that various combinations, modifications, and variations can be made therein without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention as disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (9)
1. A logical channel allocation method based on a vhf data switching system, comprising the steps of:
configuring an initialization value, wherein the initialization value comprises a configuration access rate threshold η Threshold value Time slot utilization threshold lambda Threshold value Service satisfaction rate threshold ρ Threshold value Default value of station number a 0 First data channel value 15k:
determining an occupied time slot of a logic channel in a first frame according to the initialization value and broadcasting a first time division multiple access frame structure;
determining an actual numerical value after a first period, wherein the actual numerical value comprises an average of the number a of ship stations transmitting resource applications in each time division multiple access frame, an average of the actual successful access rate eta, the actual time slot utilization rate lambda and the actual service satisfaction rate rho of the system per minute;
comparing the actual value with the initialization value and updating the first data channel value 15k based on the comparison result to obtain a second data channel value 15k', wherein when ρ < ρ Threshold value The second data channel value 15k' is then valued by:
k∈{1，2，3，4，5，6}；
when ρ is greater than or equal to ρ Threshold value And when one of the actual successful access rate η and the actual time slot utilization rate λ is smaller than a threshold value, the second data channel value 15k' is valued by the following formula: k' =max (k-1, 1); and
when ρ is greater than or equal to ρ Threshold value And when the actual successful access rate η and the actual time slot utilization rate λ are both smaller than the threshold value, the second data channel value 15k' is valued by the following formula: k' =max (k-2, 1); and
and determining the occupied time slot of the logic channel in the second frame according to the number of the ship stations a in the actual value, the actual successful access rate eta and the second data channel value 15k' and broadcasting a second time division multiple access frame structure.
2. The method for allocating logical channels based on a very high frequency data exchange system according to claim 1, wherein the logical channels comprise a bulletin board signaling channel, a random access signaling channel, an announcement signaling channel, a data channel, and a data signaling channel.
3. The method for logical channel allocation based on a vhf data switching system according to claim 2, wherein satellite bulletin board signaling is transmitted by the bulletin board signaling channel, wherein the satellite bulletin board signaling broadcasts a time division multiple access frame structure.
4. The method for logical channel allocation based on vhf data switching system according to claim 2, wherein the number of stations allocated to the data channel by the announcement signaling channel is denoted by b, the number of occupied time slots of the random access signaling channel is denoted by 5a, and the number of occupied time slots of the announcement signaling channel is denoted byThe number of occupied slots of the data channel is denoted 15kb, the number of occupied slots of the data signaling channel is denoted 5b, wherein +.>
5. The method for logical channel allocation based on a vhf data switching system according to claim 4, wherein the actual successful access rate η of the system per minute is expressed as:
6. the method for allocating a logical channel based on a very high frequency data switching system according to claim 5, wherein the slot utilization λ of the system per minute is expressed as:
where c represents the number of time slots actually occupied by the station transmitting data in one minute.
7. The method for allocating a logical channel based on a very high frequency data switching system according to claim 6, wherein determining the service satisfaction rate ρ of the system per minute comprises the steps of:
determining a priority threshold p Threshold value ；
Determining that the service priority per minute is greater than or equal to p Threshold value Is expressed as m;
determining that the priority of the service is greater than or equal to p Threshold value The number of time slots required for actually transmitting data is less than or equal to the number of the ship stations of the time slot occupied by one data channel, and is expressed as n; and
the service satisfaction rate ρ of the per minute system is expressed as:
8. the method for allocating a logical channel based on a vhf data switching system according to claim 1, wherein the first period is f minutes, where f is a positive integer greater than or equal to 1, indicating a dynamic adjustment frequency of the logical channel.
9. The method for allocating logical channels based on the vhf data switching system according to claim 1, wherein the above steps are circulated.
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