CN101394220A - Time slot uniform distribution method oriented to MF-TDMA system - Google Patents

Time slot uniform distribution method oriented to MF-TDMA system Download PDF

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Publication number
CN101394220A
CN101394220A CNA2008102246388A CN200810224638A CN101394220A CN 101394220 A CN101394220 A CN 101394220A CN A2008102246388 A CNA2008102246388 A CN A2008102246388A CN 200810224638 A CN200810224638 A CN 200810224638A CN 101394220 A CN101394220 A CN 101394220A
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time slot
terminal
rcst
allocation
time
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CN101394220B (en
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张军
张涛
秦勇
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Beihang University
Beijing University of Aeronautics and Astronautics
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Abstract

The invention provides a uniform time slot allocation method for an MF-TDMA (Multi-Frequency Time Division Multiple Access) system, which comprises the following steps: terminals send capacity request messages to a resource manager; the resource manager allocates the band width for each terminal, generates a time slot allocation sheet and send the allocation sheet to each terminal; and the terminals map the time slot allocation result in the received time slot allocation sheet to a specific time slot numbering pattern, obtain new time slot positions through inverting the time slot number, and send data in the new time slot positions, thereby realizing the uniform allocation of the time slots. The method effectively improves the service time-delay performance, and is fully compatible with the prior DVB-RCS (Digital Video Broadcasting-Real-time control system) standard and the bandwidth allocation method, and easy to be realized.

Description

A kind of time slot uniform distribution method at the MF-TDMA system
Technical field
The present invention relates to the slot allocation method of the communication system of a kind of employing MF-TDMA (multi-frequency time division multiple access accesss) technology, especially a kind of satellite communication system at employing DVB-RCS technical standard, can realize that time slot position is equally distributed and can effectively improve the slot allocation method of service delay performance.Belong to wireless communication field.
Background technology
In the wireless communication system that adopts the MF-TDMA technology, all terminals are shared air-link resources, system is used to transmit data for each user distributes certain wireless transmission resources (being time slot), and it is the cycle that the branch of time slot is equipped with frame, and allocation result distributes the mode of number of timeslots to embody with every frame.Terminal can only be to adopt burst mode to send data on its distributed time slot in each MF-TDMA frame.Behind the packet incoming terminal, must wait until that the beginning for a time slot of this terminal distribution could send data.Time slot allocation is a vital task of MF-TDMA system, is the key factor that influences service delay performance and overall system performance (wireless resource utility efficiency etc.).
In fact the distribution of time slot comprises the two-layer meaning: the one, and the distribution of number of timeslots, i.e. distributed time slot number in every frame; The 2nd, the distribution of time slot position, i.e. distributed time slot concrete position distribution in every frame.These two factors all influence the service delay performance to a certain extent, and especially when frame length was longer, the influence that time slot position distributes was more outstanding.And in the MF-TDMA satellite communication system, the frame length design is generally longer.
But present slot allocation method mainly is the distribution at number of timeslots, the method that time slot position distributes then seldom, distribution for time slot position in communication technology of satellite standard (DVB-RCS standard) all is to adopt the continuous dispensing mode, and a plurality of time slots position in frame of promptly distributing to the user is to be arranged in together continuously.About the DVB-RCS standard referring to document [1] " ETSI EN301 790 (V1.3.1): Digital Video Broadcasting (DVB): Interaction channel for SatelliteDistribution Systems; (also known as the ' DVB-RCS specification) ", other typical slot allocation methods can be referring to document [2] " Jung-Min Park.Allocation of QoS connections in MF-TDMAsatellite systems:a two-phase approach; IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY " and document [3] K.-D.Lee.Optimal scheduling for timeslot assignment in MF-TDMA broadbandsatellite communications.Proc.IEEE VTC " etc.; this method also only is to propose the number of timeslots distribution method, and distributes the method identical with the DVB-RCS standard that adopt for time slot position.This method will cause professional produce bigger time delay and delay variation, especially when frame length is longer.
Summary of the invention
The present invention proposes a kind of time slot uniform distribution method at the MF-TDMA system in order to solve the particular location assignment problem of time slot in the MF-TDMA frame of distributing to terminal, and this method realizes as follows:
Step 1, terminal send requests for capacity (CR) message to explorer (RRM).
Step 2, RRM distribute bandwidth.According to the CR message that receives, RRM gives the number of timeslots of each terminal according to certain bandwidth allocation methods (as the number of timeslots distribution method) dispensed, bandwidth allocation methods can adopt existing algorithm, such as proportionate allocation, based on the methods such as bandwidth allocation algorithm of prediction.
Step 3, RRM generate the TBTP table.RRM generates a time slot allocation table according to the allocated bandwidth result according to existing time slot continuous dispensing mode, is called for short the TBTP table, and sends to all terminals.The time slot allocation table comprises the essential information of time slot that each terminal is distributed, the clear position of time slot in the MF-TDMA frame of distributing of these information tables.
Step 4, terminal receive the TBTP table.Terminal is according to the time slot allocation table that receives, and each terminal reads content in the table, to be retrieved as its distributed time slot information.
Step 5, terminal are mapped to specific time-gap number pattern with the time slot allocation result.Terminal is recorded as the position of each time slot in the MF-TDMA frame of its distribution, is mapped to the time-gap number pattern (CBNM pattern) based on carrier wave then, and carrier wave ID (the Carrier_ID)+time-gap number (Slot_Num) of record corresponding time slot position;
Step 6, terminal obtain new time slot position by the time-gap number inverted order.Terminal represents the Carrier_ID+Slot_Num of time slot position distribution with binary form, then, the height bit of Slot_Num is carried out inverted order, keeps Carrier_ID constant simultaneously.
Step 7, terminal are carried out step 5 and six operations to all distributed time slot, are equivalent to terminal like this and have received a new time slot allocation table.All terminals all adopt same operation, and time slot position new in the MF-TDMA frame sends data.
So promptly realized the uniform distribution of time slot position.
Time slot uniform distribution method of the present invention, compare with existing slot allocation method and to have the following advantages:
1) distributes and two levels of time slot position distribution have solved time slot allocation problem the MF-TDMA system from number of timeslots simultaneously;
2) can effectively reduce service delay, especially for the long more system of MF-TDMA frame length, delay performance is good more;
3) the complete and existing DVB-RCS operating such of this method, and can combine with existing multiple number of timeslots distribution method, simple and practical.
Description of drawings
Fig. 1 is the flow chart of distribution method of the present invention;
Fig. 2 is based on the time-gap number pattern of subframe;
Fig. 3 is based on the time-gap number pattern of carrier wave;
Fig. 4 a is a time slot allocation example of FBNM pattern;
Fig. 4 b is the mapping example of FBNM pattern to the CBNM pattern;
Time slot uniform distribution result after the inverted order in Fig. 4 c example.
Embodiment
The time slot uniform distribution method that the present invention proposes is realized the uniform distribution of time slot in frame based on the primary bandwidth assigning process of DVB-RCS standard, steps flow chart as shown in Figure 1, its main method step is:
(1) (return channel satellite terminal RCST) sends requests for capacity (CR) message to explorer (RRM) to the backward channel ICBM SHF satellite terminal;
(2) explorer distributes bandwidth.According to the CR message that receives, RRM is according to certain bandwidth allocation methods, as the number of timeslots distribution method, dispensed is given the number of timeslots of each RCST terminal, bandwidth allocation methods can adopt existing algorithm, such as proportionate allocation, based on the methods such as bandwidth allocation algorithm of prediction;
(3) explorer generates the TBTP table.RRM generates a TBTP table and sends to all terminals according to existing time slot continuous dispensing mode according to the allocated bandwidth result.Identical in the structure of TBTP table and the DVB-RCS standard, the TBTP table comprises the essential information of each RCST terminal distribution time slot, such as " Start_slot (initial time slot) ", " Assigned_count (quantity allotted) " etc., the clear position of time slot in the MF-TDMA frame of distributing of these information tables;
(4) according to the TBTP table that receives, each RCST terminal reads content in the table, to be retrieved as its distributed time slot information;
(5) terminal is mapped to the CBNM pattern with the TBTP table.Terminal is recorded as the position of each time slot in the MF-TDMA frame of its distribution, and is numbered according to the time-gap number mode based on subframe in DVB-RCS standard.
Shown in Figure 2 is in the DVB-RCS standard based on subframe time-gap number mode schematic diagram, abbreviate the FBNM pattern as.The FBNM pattern adopts subframe+time slot two-stage numbering, all time slots on each carrier wave at first are divided into subframe, each subframe comprises several slots, and wherein the timeslot number that comprises of each subframe can be different, so the number of sub frames of dividing on the different carrier also can be different.On method for numbering serial, the high order end of first carrier wave begins, and subframe numbers is 0, then, from left to right, carrier wave from the bottom to top, subframe numbers increases continuously, the low order end subframe of last carrier wave is numbered 2 N-1, promptly divide 2 altogether NIndividual subframe; Time slot in each subframe is since 0 serial number from left to right.
Then with above-mentioned numbering of carrying out (subframe+time slot two-stage numbering) according to the time-gap number mode in the DVB-RCS standard, be mapped to time-gap number pattern (CBNM pattern) based on carrier wave, and carrier wave ID (the Carrier_ID)+time-gap number (Slot_Num) of record corresponding time slot position.
Shown in Figure 3 is the time-gap number mode based on carrier wave that the present invention proposes, and is referred to as the CBNM pattern.The CBNM pattern adopts carrier wave+time slot two-stage numbering, and the time slot on each carrier wave is since 0 serial number from left to right.
Mapping process from the FBNM pattern to the CBNM pattern is exactly that numbering with time slot under the FBNM pattern corresponds to the numbering of this time slot position under the CBNM pattern and gets final product.This mapping process does not change the position of distribution time slot in frame, only is the numbering that has changed this time slot correspondence.
(6) terminal is with the time-gap number inverted order.
The RCST terminal is represented the Carrier_ID+Slot_Num of time slot position distribution with binary form.Then, the height bit of Slot_Num is carried out inverted order, keep Carrier_ID constant simultaneously.Such as, the position of the distribution time slot that is received by TBTP is the 14th time slot on the 7th carrier wave, by the FBNM mode map after the CBNM pattern, the time slot correspondence be numbered 6_13 (decimal system) or 110_1101 (binary system), after the inverted order operation, Slot_Num becomes 1011 by 1101, and Carrier_ID still is 110 simultaneously.This just represents that RCST goes up the transmission data with the time slot (the 11st time slot on the carrier wave 6) of the 110_1011 of being changed on the throne, rather than the 110_1101 time slot position in original MF-TDMA frame.
(7) RCST carries out step (5) and (6) operation to all distributed time slot, is equivalent to RCST like this and has received a new TBTP table.All RCST adopt same operation, and time slot position new in the MF-TDMA frame sends data.Like this, promptly realized the uniform distribution of time slot position, and this flow process and DVB-RCS standard and various bandwidth allocation algorithm are compatible fully.
Embodiment
Fig. 4 a, 4b, 4c have provided the detailed example of time slot uniform distribution method of the present invention, and this example is realized the uniform distribution of time slot as follows:
Step 1, RCST send requests for capacity (CR) message to explorer (RRM).Suppose that it is 4 time slots that the RCST terminal i sends requests for capacity, it is 2 time slots that the RCST terminal j sends requests for capacity.
Step 2, RRM are each RCST terminal distribution number of timeslots according to proportionate allocation.Suppose that allocation result is 4 time slots of RCST terminal i distribution, 2 time slots of terminal j distribution.The compatible existing various bandwidth distribution method of this step.
Step 3, RRM generate the TBTP table according to above-mentioned allocated bandwidth result according to the existing time slot continuous dispensing of DVB-RCS standard mode.RCST terminal i corresponding assignment information in the TBTP table is: Frame_Num 2, Start_slotO, and Assigned_count 4; RCST terminal j corresponding assignment information in the TBTP table is: Frame_Num 7, Start_slotO, and Assigned_count 2.
Step 4, RCST terminal are retrieved as the information that it distributes time slot according to the TBTP table that receives.It is continuous 4 time slots that the 0th time slot in the subframe 2 begins that the RCST terminal i is known as its distributed time slot, shown in Fig. 4 a, the position of time slot that the RCST terminal i is distributed in the MF-TDMA frame is 2 for corresponding subframe numbers among Fig. 4 a, and time-gap number is the time slot of 2_0,2_1,3_0,3_1; It is continuous 2 time slots that the 0th time slot in the subframe 7 begins that the RCST terminal j is known as its distributed time slot, to distribute the position of time slot in the MF-TDMA frame be 7 for corresponding subframe numbers among Fig. 4 a, time-gap number is the time slot of 7_0 and 7_1.Above step 3, step 4 compatible with DVB-RCS standard.
Step 5, RCST terminal are mapped to CBNM time-gap number pattern with the time slot allocation result.Shown in Fig. 4 b, after time slot mapping that terminal i is distributed arrived the CBNM pattern, corresponding time slot place carrier index was 1, therefore corresponding time-gap number is that 1_0 is to 1_3, after time slot mapping that terminal j is distributed arrived the CBNM pattern, corresponding time slot place carrier index was 2, and therefore corresponding time-gap number is 2_4 and 2_5.
Step 6, terminal are by obtaining new time slot position to the time-gap number inverted order under the CBNM pattern.Shown in Fig. 4 b, the RCST terminal i distributes the binary number of time slot correspondence to be respectively 01_000,01_001,01_010 and 01_011, respectively Slot_Num000,001,010 and 011 is carried out inverted order, newly numbered and be respectively 000,100,010 and 110, represent that then the time slot that the actual use location of RCST terminal i is numbered 1_0,1_4,1_2 and 1_6 carries out transfer of data, shown in Fig. 4 c.The RCST terminal j distributes the binary number of time slot correspondence to be respectively 10_100 and 10_101, then carry out the timeslot number inverted order after, the time slot position of the actual use of RCST terminal j is numbered and is respectively 2_1 and 2_5, shown in Fig. 4 c.As seen, through after the timeslot number inverted order, the position distribution of the time slot that RCST terminal i and j are assigned in the MF-TDMA frame all have certain evenly.Realize the time slot uniform distribution by step 5 and step 6, can effectively reduce service delay, method is simple, only need increase function in the RCST terminal, does not need extra system to revise, and is convenient to realize compatible with DVB-RCS standard.
During all showing TBTP according to same rule (step 5 and step 6), step 7, all RCST terminals carry out inverted order for its distributed time slot coding, thereby each RCST terminal all obtains equally distributed time slot position new in the MF-TDMA frame, and sends data in new time slot.

Claims (2)

1, a kind of time slot uniform distribution method at the MF-TDMA system is characterized in that, comprises the steps:
Step 1: the backward channel ICBM SHF satellite terminal sends capacity request messages to explorer;
Step 2: according to the capacity request messages that receives, explorer is given the number of timeslots of each terminal according to the bandwidth allocation methods dispensed;
Step 3: explorer generates a TBTP table and sends to all terminals according to existing time slot continuous dispensing mode according to the allocated bandwidth result; Identical in the structure of TBTP table and the DVB-RCS standard, the TBTP table comprises the essential information of each RCST terminal distribution time slot, the clear position of time slot in the MF-TDMA frame of distributing of these information tables;
Step 4: according to the TBTP table that receives, each RCST terminal reads content in the table, to be retrieved as its distributed time slot information;
Step 5: terminal is recorded as the position of each time slot in the MF-TDMA frame of its distribution, is mapped to the time-gap number pattern based on carrier wave then, and the Carrier_ID+Slot_Num of record corresponding time slot position;
Step 6: the RCST terminal represents the Carrrier_ID+Slot_Num of time slot position distribution with binary form, then, the height bit of Slot_Num carried out inverted order, keeps Carrier_ID constant simultaneously;
Step 7: the RCST terminal is carried out step 5 and step 6 operation to all distributed time slot, is equivalent to RCST like this and has received a new TBTP, and all RCST adopt same operation, send data at new time slot position.
2, time slot uniform distribution method according to claim 1 is characterized in that: the bandwidth allocation methods of mentioning in the described step 2 be existing proportionate allocation or based on the prediction bandwidth allocation algorithm or other number of timeslots allocation algorithms.
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