RU2410838C1 - Method for dynamic allocation of transmission capacity resources of return channels in interactive access multimedia satellite communication network - Google Patents

Abstract

FIELD: physics, radio. ^ SUBSTANCE: invention relates to radio communication and specifically to communication with methods of allocating radio resources for return channels in interactive access multimedia satellite networks. The result is achieved due to that, streams of sources of multimedia traffic of each satellite interactive terminal are ranked into service class queues. Each queue is assigned a specific weight coefficient. Data packets transmitted by the terminal are fragmented in the buffer into data blocks of fixed volume. Satellite interactive terminals perform dynamic reservation of time slots on duration of the next super frame by sending requests containing information on the predicted statistical distribution of the number of data blocks in buffer queues of the serviced service classes. The central station allocates time slots to each satellite interactive terminal through a formalised procedure which minimises the integral function of quality of service of the multimedia traffic based on introduction of conditional fines for non-servicing of data blocks of active service class queues. ^ EFFECT: cutting on time spent on the procedure for allocating time slots and increasing efficiency of using transmission capacity resources of an interactive access multimedia satellite communication network. ^ 4 cl, 4 dwg

Description

The invention relates to the field of radio communications, and in particular to methods of distributing radio resources in multimedia satellite interactive access networks, providing high efficiency of using the capacity of satellite channels and maintaining the requirements for the quality of user service.

The increase in demand for high-quality digital telephony, video conferencing, file sharing services has led to the need to integrate technical solutions for the transmission of multimedia traffic. The basis of integration was equipment that supports modern network technology packet switching. The concept of widespread adoption of network technologies was most fully reflected in the creation of digital integrated service networks, which ensure the integration of a large number of different services within a single telecommunication network.

Satellite communications have the most important advantages necessary for building large-scale telecommunication networks. First, with its help it is possible to quickly form a network infrastructure covering a large territory and not depending on the presence or condition of terrestrial communication channels. Secondly, the use of modern technologies of access to the satellite relay resource and the ability to deliver information to an almost unlimited number of consumers significantly reduce network operating costs. These advantages provide interactive multimedia satellite networks similar to the standards DVB-RCS (ETSI EN 301 790 v1.3.1, 2003), IPoS (TIA-1008, 2003), high attractiveness for departments, enterprises, companies with geographically distributed infrastructure, extremely interested in reducing the cost of paying for communication services and preferring to create their own more economical technological communication networks.

An effective solution for increasing the utilization of the bandwidth of interactive multimedia satellite communication networks is the use of multi-frequency multi-station access with time division (MF-TDMA - multi frequency-time division multiple access).

In accordance with accepted standards (DVB-RCS and IPoS), a multimedia satellite communications network consists of a central station (CA, HUB) and a plurality of satellite interactive terminals (CIT). In the direction from the DS to the SIT (forward channel), information for all terminals is transmitted in a single multiplexed high-speed digital stream on one carrier in the fixed-lock mode (TDM / PAMA mode), from the SIT to the DS (reverse channels), data is transmitted on a plurality of carrier frequencies , each of which is divided into time slots provided to CITs by reservation requests (MF-TDMA / DAMA).

The standards determine that multimedia satellite communication networks are built according to the star topology with the possibility of switching to a fully connected operation mode in order to reduce the time of information transfer between SITs.

The CA provides cyclic and clock synchronization of satellite terminals in the return channels, and also performs the functions of monitoring and controlling their access to the network bandwidth resource and its efficient distribution.

According to the standards, the entire time-frequency resource of the return channels available for transmitting information traffic is divided into superframes, which, in turn, consist of frames. Each frame is a set of carrier frequencies divided into time slots. The superframe repetition period (cycle) is fixed, the duration and number of time slots in a frame can vary within the framework of known limitations. A distributed resource is time-frequency slots, the number and location of which for the duration of the next super-frame determines the quality of multimedia transmission services (minimum bandwidth, allowable delay, packet jitter, reliable delivery).

For the satellite terminal to determine the start time of transmission in the next cycle, the carrier frequency and time slots for transmission, the CA generates a temporary transmission plan (BTP-Burst Time Plan), which is brought to all active SITs in the form of a TBTP table (Terminal Burst Time Plan).

The method of allocating bandwidth resources is beyond the scope of the standards; therefore, satellite equipment manufacturers offer their own unique technical solutions.

A known method of forming an adaptive dynamic frequency-time transmission plan (see, for example, "Device for allocating shared resources of a communication network, by assignment of time slots of a dynamically adaptable time / frequency plan", US patent No. 2008/0069045 A1, H04Q 7/00, dated March 20, 2008).

According to the invention, the resource allocation device CA forms a superframe structure by a combination of three types of frames. Each subsequent frame contains the number of time slots that are multiples of the number of time slots in the frame of the first type. For example, if in a frame of the first type there are n time slots, then in the frame of the second type it is n × m, and in the frame of the third type it is n × m × k, n, m, k are positive integers. Depending on the propagation conditions of the radio signal, a working configuration of the modem (modulation and coding format) is established in the satellite terminal. For each modem configuration, an appropriate set of time slots from frames of the first, second, or third type is defined. Finally, the transmission time plan is a set of time-frequency blocks allocated for each active satellite terminal.

The disadvantage of the analogue method is that the selection of the required number of time slots for the SIT is carried out by standard templates of frames of various types and in their arbitrary location according to the structure of the time-frequency plan. This leads to low efficiency of using the bandwidth of the time-frequency structure of the superframe and the appearance of additional time delay and jitter when transmitting multimedia traffic. In addition, there is no possibility of introducing differentiated service flows of various classes of service in the case of a limited resource bandwidth.

Another method for dynamically allocating bandwidth resource in interactive multimedia satellite communication networks is described in the patent (see, for example, "Apparatus and method for dynamic resource allocation in interactive satellite multimedia system", US patent No. 7346069 B2, H04L 12/28, dated 18.03 .2008).

According to the invention, in order to increase the computational efficiency of bandwidth allocation, the dynamic scheduling device (scheduler) of the CA estimates the volume of requests for resource allocation received from active SITs, generates paired frames in the super-frame structure, divides the total amount of the requested bandwidth resource by the number of paired frames. Next, the CA distributes the shares of the requested bandwidth resource per pair within this pair sequentially for all active SITs and duplicates the distribution obtained in the remaining pair frames, thereby achieving a reduction in the computational time required to allocate the resource in the superframe.

The disadvantage of the analogue method is that the introduced procedures provide for the reduction of computational complexity in the allocation of bandwidth resources, rather than achieving high efficiency of its use. Quality of Service (QoS) requirements for various types of traffic are not taken into account.

One of the methods for allocating the bandwidth resource in satellite interactive access networks, taking into account the time delay and jigger requirements for multimedia traffic, is proposed in the invention (see, for example, "Method of allocating communication resources in an MF-TDMA telecommunication system", US patent No. 7385943 B2, H04B 7/212, dated 10.06.2008).

According to the invention, all multimedia traffic declared for transmission in reverse channels, depending on the transmission quality requirements, is divided into information flows (service classes) sensitive to time delay (real-time traffic: speech, video conferencing), and information flows that are not critical to time delay (interactive data traffic: file transfer, Internet access, e-mail, etc.). The analogue method involves the reservation on a fixed basis of time slots from one superframe to another to transmit real-time traffic in order to reduce the time delay and jigger. For interactive data traffic on each period of the super-frame, the time slots remaining in the super-frame after servicing real-time traffic requests are assigned. The main attention in this analogue method is paid to the technical implementation of the algorithm for assigning time slots sequentially by service class (justification of performance, processor clock frequency, bus capacity), which reduces the time spent on the procedure for creating a temporary transmission plan (VTR).

The disadvantage of the analogue method is that the proposed method, aimed at increasing computational efficiency in the allocation of bandwidth resources, does not take into account dynamic (statistical) traffic characteristics (packet arrival rate in buffers and their volume), the degree of provision of differentiated requirements to the quality of packet data service and does not provide for the achievement of high resource utilization.

The closest in physical essence to the proposed solution is the method of dynamic resource allocation in interactive satellite communication networks described in the invention (see, for example, "Dynamic resource allocation based on quality-of-service", US patent No. 2007/0104101 A1, H04L 12/26, dated 05/10/2007).

According to the invention, all dynamic reservation requests arriving at the CA from satellite terminals are classified by service class on the basis of the requested speed, the amount of data transmitted, the level of QoS service quality requirements, etc. The dynamic scheduling device of the CA, in accordance with the class of requests, sequentially distributes the time-frequency resource available in the current superframe. Bandwidth resource allocation is performed by time-frequency blocks of a fixed volume [ΔF · Δτ], where ΔF is the frequency band corresponding to the minimum symbol rate, Δτ is the duration of the time slot.

The disadvantage of the prototype method is the low computational efficiency of actually iterative procedures for allocating a time-frequency resource sequentially from requests of the highest class of service to less priority and the need for repeated redistributions with limited resources.

The technical result to which the invention is directed is to reduce the time allocated to the procedure for allocating time slots, and to increase the efficiency of using the bandwidth resource of an interactive access satellite multimedia network.

This technical result is achieved due to the fact that in the known method of allocating time slots, all dynamic reservation requests received by the satellite terminal from the satellite terminals are classified by service class on the basis of the requested speed, the amount of data transferred, the level of QoS service quality requirements, etc. . In accordance with the class of requests, the dynamic planning device of the central station sequentially distributes the time-frequency resource available in the current superframe. The bandwidth resource is allocated by time-frequency blocks of a fixed volume [ΔF · Δτ], where ΔF is the frequency band corresponding to the minimum symbol rate, Δτ is the duration of the time slot, additionally, the streams of multimedia traffic sources of each satellite interactive terminal are ranked according to the queues of service classes with assignment each queue of a specific weight coefficient characterizing the degree of QoS requirements, type of application, protocol. The data packets transmitted by the satellite interactive terminal are fragmented in the buffer of active service classes into data blocks of a fixed volume that are multiples of the data bits of one time slot in a given modem configuration (symbol rate, modulation and coding format). Interactive satellite terminals dynamically reserve time slots for the duration of the next super-frame by transmitting requests containing information on the predicted statistical distribution of the number of data blocks in the queues of buffers of the served classes of service. The central station allocates time slots to each interactive satellite terminal using a formalized procedure that minimizes the integral function of the quality of service for multimedia traffic based on the imposition of conditional fines for under-servicing data blocks of queues of active service classes.

Bandwidth resource allocation in accordance with the claimed method is carried out in two stages using easily formalized solutions: at the first stage, for each satellite terminal, the optimal number of time slots is found among the set of valid solutions that minimize the integral quality objective function and take into account the specific limitations of the time-frequency plan; at the second stage, the resulting optimal solutions are adjusted taking into account the requirements of their integerity. The distribution of time slots in the current superframe is carried out taking into account their availability after reservation in previous superframes.

Thanks to a new set of essential features, the method reduces the time allocated to the procedure for allocating the bandwidth of an interactive satellite communication network by ranking streams of multimedia data sources, fragmenting data packets into blocks of a fixed volume, predicting and approximating an arbitrary histogram statistic distribution of the number of incoming data blocks in a queue various classes of service, the introduction of a simplified computational procedure for To search for the optimal distribution of the number of time slots, taking into account their available number for the duration of the next superframe, excluding the use of exhaustive forward and reverse sweep algorithms.

The analysis of the prior art made it possible to establish that analogues that are characterized by a combination of features that are identical to all the features of the claimed technical solution are absent, which indicates the compliance of the claimed method with the condition of patentability "novelty".

Search results for known solutions in this and related fields of technology in order to identify features that match the distinctive features of the prototype of the claimed method showed that they do not follow explicitly from the prior art. The prior art also did not reveal the fame of the distinctive essential features that determine the same technical result that is achieved in the claimed method. Therefore, the claimed invention meets the condition of patentability "inventive step".

The claimed method is illustrated by drawings, which show:

figure 1 - structure of a multimedia satellite communications network that implements time-division multiple access (MF-TDMA) in reverse channels;

figure 2 - time-frequency structure of a superframe;

figure 3 - block diagram of the distribution of time slots for the duration of the super-frame;

figure 4 - composition of the device dynamic time-frequency planning.

The possibility of implementing the inventive method is explained as follows.

Figure 1 presents the multimedia network satellite communications interactive access, where

11 - the central station of the network (CA, HUB);

12 - communication repeater located on board the spacecraft in geostationary orbit;

13 - satellite interactive terminals.

In a direct channel from the CA 11 through the communication repeater 12, data streams for all satellite interactive terminals of the network 13 (CIT 1, CIT 2, ..., CIT N) are transmitted in a single multiplexed high-speed digital stream on a single carrier in fixed lock mode (TDM / PAMA mode ) In the return channels from the SIT to the DS, time division multiple access (MF-TDMA) is implemented, in which the SITs can transmit data on one of the available carrier frequencies at the allocated positions of the time slots. The number of carrier frequencies is determined by the technical capabilities of the terminals and corresponds to the number of demodulators in the composition of the CA equipment.

The public time-frequency resource of the return channels of a satellite network is divided into superframes 20, each of which, in turn, is divided into frames 21 (FIG. 2).

Each frame 21 occupies a set of frequency bands Δf _s1 , Δf _s2 , Δf _s3 , corresponding to the symbolic transmission rate, and is limited in time by a fixed duration divided by time slots 22. The number of time slots in a superframe at the positions of which data with information bit rate is transmitted determines Potential network bandwidth resource. For example, in the structure shown in FIG. 2, superframe 20 consists of 8 frames 21, each of which has 15 time slots 22. The information rate for a duration of one time slot is 32 kbit / s. In this case, the network bandwidth resource is 8 · 15 · 32 = 3840 kbit / s.

To gain access to the bandwidth resource of the next super-frame, the SIT undergoes a registration procedure, which includes the steps of terminal initialization, carrier frequency synchronization, and cycle and clock synchronization.

To transmit dynamic reservation requests for allocation of time slots of the next super-frame, the temporary positions of the channel-wide signaling (CSC) slots are used, distributed between active terminals based on random (S-ALOHA) or fixed cyclic (RR-DAMA) access.

After processing the requests, the CA distributes and assigns to each SIT the necessary number of traffic time slots according to the principle of fixed reservation for the duration of a superframe. Time-frequency assignment information is dynamically updated from superframe to superframe based on new estimates of request volumes.

Data on the allocation of a radio resource CA for the operation of satellite interactive terminals (frequency band, carrier number, time intervals for slot transmission) is transmitted in the form of additional service information tables: superframe composition, frame composition, structure of time slots, correction messages, terminal information messages, time information terminal packet transfer plan (TBTP).

Within the frame of the CIT, any traffic time slots can be allocated. For example, in figure 2, the arrows show the sequence of allocation of time slots for one terminal, first slot 1 in the frequency band Δf _s1 , then slot 12 in the frequency band Δf _s3 and slot 9 in the frequency band Δf _s2 . Such a distribution of time slots can be duplicated in all frames of a given superframe or have a different distribution.

Figure 3 presents a block diagram of the proposed method for allocating a bandwidth resource for the duration of the next super-frame.

To allocate the bandwidth resource by the central station for the duration of the next k-th super-frame, the number of available time slots for the duration of the next k-th super-frame is estimated (step 301)

M (k) = Δf / Δf _{sn trf} -a (k),

where Δf / Δf _s is the number of frequency channels in the superframe;

a (k) is the number of slots that are strictly reserved by the requests of previous superframes;

n _trf is the maximum number of time slots of one frequency channel used to transmit information data streams for a super-frame duration.

Also, a large number of possible V-modems (symbol rate, modulation and coding format) of SITs for reverse channels providing close to allowable signal-to-noise ratios are analyzed in the CA.

(этап 302), к которым применяется алгоритм приоритетного обслуживания. Различные СИТы могут иметь схожие классы сервиса.In accordance with the proposed method, all incoming multimedia data traffic by CIT in accordance with the level of QoS requirements for transmission quality (time delay, jigger, loss) is ranked according to the queues of several service classes

(step 302) to which the priority service algorithm is applied. Different CITs may have similar classes of service.

в заданной конфигурации модема СИТ.The amount of incoming data packets of each queue can be arbitrary, in contrast to the amount of information bits of data transmitted at the positions of time slots in a given configuration of the SIT modem for the duration of a superframe. For the most efficient use of the allocated bandwidth to the data packets of the queues of all service classes, it is necessary to apply the fragmentation procedure, as a result of which the data blocks will have a fixed amount (step 303). The fixed volume of the data block of the corresponding service class must be consistent with the number of time slots required for its maintenance

in the given configuration of the SIT modem.

за недообслуживание одного блока данных соответствующего класса сервиса. Значение весового коэффициента определяется с помощью процедуры ранжирования, учитывающей содержание заголовков пакетов, требования активных приложений, задействуемых протоколов. Трафику, предъявляющему более жесткие требования, присваивается более высокий весовой коэффициент.For the data stream of each queue, specific gravity factors (fines) are set (step 304)

for the underservice of one data block of the corresponding class of service. The value of the weight coefficient is determined using the ranking procedure, taking into account the contents of the packet headers, the requirements of active applications, the protocols involved. More demanding traffic is assigned a higher weight ratio.

.To transmit data in the satellite channel, the CITs dynamically reserve time slots for the duration of the next superframe by transmitting requests. Since the time it takes for the CIT to receive the time slot distribution table from the CA, taking into account the propagation delay for the GSO, will be at least 500 ms, the request for the dynamic reservation of the satellite terminal should include (step 305) information on the predicted statistical distribution of the quantity of data blocks of a fixed volume in the buffer each class of service for the duration of a super-frame in the form of discrete (histogram) distribution densities

.

To allocate the bandwidth resource as part of the dynamic time-frequency planning device 40 (Fig. 4), the CA has a resource allocation block 42, which, based on the given algorithm, determines the integral function of the quality of traffic service and conditional fines for the under-maintenance of data blocks of queues of various service classes each CIT has the optimal number of time slots, taking into account restrictions on their availability in the next superframe.

Conventionally, as part of a dynamic time-frequency planning device, it is also possible to allocate a block for collecting and processing requests 41 for dynamic reservation received from active satellite terminals, and a block for generating TVTR 43, which assigns (assigns) to each SIT time slots for frequency bands in a formalized form TVTR tables.

, заданных на множестве допустимых целочисленных значений

в виде количества обслуживаемых блоков данных по очередям активных классов сервиса для всех спутниковых терминалов.The resource allocation unit 42 calculates a vector of decision variables

defined on the set of valid integer values

in the form of the number of data blocks served by queues of active service classes for all satellite terminals.

.Achieving the highest level of security for servicing data streams of all satellite network terminals, taking into account the differentiated requirements for the quality of their service, is possible by minimizing the penalty function integrated for the network

.

For example, for a service class s stream, if there are data blocks in the y buffer and allotted time slots for servicing only x _s blocks, the penalty weight function is expressed as

, когда обеспечены временными слотами x_s блоков данных, выражается функциейThe value max {0, yx _s } determines the maximum number of unattended data blocks in the buffer of the s-th service class of one SIT. The expected penalty for the s-th class of service in the case of a known discrete (histogram) distribution density

when provided with time slots x _s data blocks, is expressed by the function

Then the integral quality function, representing the total network penalty for underserving data blocks of active classes of services, is written as

The total number of assigned traffic time slots to active service classes should be no more than the number of available slots in a superframe

.Where

.

Mathematically, the task of distributing time slots between flows of active service classes of all satellite terminals, taking into account restrictions (4), is formalized in the following form (step 306)

This problem belongs to the class of problems of stochastic nonlinear integer convex programming. Well-known methods applied to tasks of this class do not allow achieving computational efficiency acceptable for real-time solutions and lead to lengthy procedures for finding optimal solutions (D. Himmelblau. Applied nonlinear programming. Edited by M.L. Bykhovsky. M.: Mir, 1975 .-- 534 p., Ill.).

To simplify the solution in the proposed method, the integer programming problem is first reduced to the unconstrained nonlinear optimization problem with relaxation of the integer variables to continuous values, and at the final stage, integer solutions that are close to optimal are searched based on heuristic procedures.

Using the Lagrange multiplier method, the conditional optimization problem is reduced to unconditional as a function

целочисленных переменных для применения численных процедур методов нелинейной оптимизации проведем их замену некоторыми аппроксимирующими функциями

плотности вероятности количества блоков данных, допускающей условие их двойной дифференцируемости в интервале (0, ∞) (этап 305).Finding a stable minimum of the convex function L (x, λ) is possible using numerical optimization methods. However, due to the non-differentiability of functions

integer variables for applying the numerical procedures of nonlinear optimization methods, we will replace them with some approximating functions

the probability density of the number of data blocks allowing the condition of their double differentiability in the interval (0, ∞) (step 305).

выборки Y_S={y_s(1),…,y_s(k)} по активным классам сервиса

каждого терминала формируются непараметрические регрессионные оценки плотности вероятностиIn the proposed method for approximating an arbitrary type of discrete distribution of data blocks in queues by continuous distribution based on the sequence of superframes observed

samples Y _S = {y _s (1), ..., y _s (k)} by active service classes

of each terminal nonparametric regression estimates of probability density are formed

where Φ (·) is the core that satisfies a number of well-known properties (Hardle V. Applied Nonparametric Regression. - M .: Mir, 1993. - 349 p.); α is the smoothing parameter, the value of which can be determined from the condition for maximizing the likelihood function determined by the cross-validation method (Hardle V. Applied Nonparametric Regression. - M .: Mir, 1993. - 349 p.).

The optimal solutions x * and λ * for functional (6) are calculated taking into account the necessary conditions (step 307)

which implies

Where

a λ * can be obtained by substituting (10) in (9) for ∇ _λ L (x, λ)

From the condition ψ (λ) = M, we obtain

.Where

.

From (10, 12), we finally obtain

In steps 308-313, integer values are determined from the optimal solutions found in step 307. To efficiently search for solutions that are close to optimal, heuristic procedures are proposed that have low computational complexity.

(этап 308). Если множество A пустое (этап 309), т.е.

то решение найдено, в противном случае вычисляется освободившийся ресурс временных слотов

(этап 310) вследствие ограничений на целочисленность.1. The set of service class numbers with non-integer solutions is determined

(step 308). If the set A is empty (step 309), i.e.

then a solution is found, otherwise the freed-up resource of time slots is calculated

(step 310) due to integer constraints.

2. For all service class numbers s ∈ A, the sensitivity coefficient of partial penalty functions with respect to the added difference to the nearest integer variable is calculated

(этап 311). Контролируя условие a≥d_j (этап 313), обновляются значения

, a=a-d_j, A=A-{j} (этап 312) до тех пор, пока A не станет равным нулю.3. The class of service with the highest sensitivity coefficient is determined.

(step 311). Controlling the condition a≥d _j (step 313), the values are updated

, a = ad _j , A = A- {j} (step 312) until A becomes zero.

поступают в блок формирования ТВТР 43 (фиг.4) для окончательного установления временных позиций распределенных трафиковых слотов во временном плане передачи, который доводится до всех активных спутниковых терминалов в формализованном виде таблицы ТВТР (этап 314).The resulting integer values

enter the TBTP formation unit 43 (Fig. 4) for the final establishment of the temporary positions of the distributed traffic slots in the transmission time plan, which is brought to all active satellite terminals in a formalized form of the TBTP table (step 314).

On this, the procedures for processing dynamic reservation requests and bandwidth resource allocation for the k-th superframe are considered complete.

The proposed method is based on an algorithm for weighted bandwidth allocation of the time-frequency structure of a superframe between streams of various classes of services of active satellite terminals and provides a significant reduction in the disadvantages of the prototype method by ranking streams of multimedia data sources by the level of differentiated requirements for quality of service, fragmentation of data packets into blocks a fixed volume corresponding to the volume of a temporary slot in a given modem configuration a) predicting and approximating an arbitrary histogram statistical distribution of the number of incoming data blocks in the queue of various service classes, introducing a simplified computational procedure to find the optimal distribution of the number of time slots taking into account their available number over the duration of the next superframe, eliminating the use of exhaustive forward and reverse sweep algorithms.

This method of resource allocation bandwidth can be implemented on modern computing processors.

The indicated method can find its application in any wireless access systems transmitting multimedia information between subscriber terminals in conditions of limited frequency and energy resources.

Claims (4)

1. The method of dynamic resource allocation in interactive satellite communication networks, which consists in the fact that all dynamic reservation requests received by a satellite terminal from a satellite terminal are classified by service class based on the amount of requested speed, the amount of data transferred, the level of QoS service quality requirements, device dynamic planning of the central station in accordance with the class of requests sequentially distributes the time-frequency res available in the current superframe pc, bandwidth resource allocation is carried out by time-frequency blocks of a fixed volume [ΔF · Δτ], where ΔF is the frequency band corresponding to the minimum symbol rate, Δτ is the time slot duration, characterized in that the streams of multimedia sources of each satellite interactive terminal are ranked by queues of service classes with assignment of each queue to a specific weight coefficient characterizing the degree of QoS requirements, type of application, protocol. 2. The method according to claim 1, characterized in that the streams of the multimedia graphics sources of each satellite interactive terminal are fragmented in the buffer of active classes of service into data blocks of a fixed volume that are multiples of the data bits of one time slot in a given modem configuration (symbol rate, modulation format and coding). 3. The method according to claim 1, characterized in that the satellite interactive terminals dynamically reserve time slots for the duration of the next super-frame by transmitting requests containing information about the predicted statistical distribution of the number of data blocks in the queues of buffers of the served classes of service. 4. The method according to claim 3, characterized in that the central station allocates time slots to each satellite interactive terminal using a formalized procedure that minimizes the integral function of the quality of service of multimedia traffic based on the introduction of conditional fines for underserving data blocks of queues of active service classes.

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