CN113038530A - High-efficiency transmission method for packet service of QoS guarantee of satellite mobile communication system - Google Patents
High-efficiency transmission method for packet service of QoS guarantee of satellite mobile communication system Download PDFInfo
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- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
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- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
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- H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
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- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
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Abstract
The invention discloses a high-efficiency transmission method of QoS guaranteed packet service in a satellite mobile communication system, which comprises the steps of firstly screening out a temporary block flow with a data transmission requirement in a channel; then calculating the scheduling priority, the length of the pre-sent data and the length of the total pre-sent data of each temporary block flow; adding service data into a list to be multiplexed by using different strategies through comparing the length of the total pre-sent data with the length of the channel burst load; updating the waiting time according to the scheduling condition of each temporary block flow; and finally, filling the data into the burst load according to the list to be multiplexed. The invention is suitable for a satellite mobile communication system adopting a TDMA transmission system, adjusts the multiplexing quantity and the transmission rate of the data packets in real time based on the priority of the terminal service and the QoS guarantee requirement, can obviously improve the utilization rate of channel resources, and greatly improves the bearing capacity and the access capacity of the system to low-speed packet services while ensuring the QoS guarantee and the fairness of the service rate among terminals.
Description
Technical Field
The invention belongs to the technical field of satellite mobile communication, and particularly relates to a high-efficiency transmission method for packet service of QoS guarantee of a satellite mobile communication system.
Background
In a satellite mobile communication system, when a single terminal works in a circuit domain (voice service, etc.), the terminal is allocated with individual, unshared time-frequency resources in a spot beam in a resource exclusive mode, that is, in the whole process of voice service initiation, connection, conversation, release, etc. When the terminal works in a packet domain (data service, etc.), based on the characteristics of real-time performance and timeliness of the packet service, in order to support as many terminals as possible to perform packet data service exchange simultaneously in limited time-frequency resources, the system will multiplex a plurality of services with the same terminal type or services with similar rate requirements in the same time-frequency resource, and at this time, the time-frequency resource is called a shared channel. The data service is mapped to the temporary block flow in the MAC layer to realize multiplexing in the shared channel, and the service bearing and the temporary block flow are in one-to-one correspondence. Therefore, how to realize efficient transmission of multiple services in a channel by screening, scheduling and multiplexing transmission of the temporary block flow is one of the important problems for ensuring the communication performance of the satellite mobile communication system.
Disclosure of Invention
Aiming at the problem of efficient transmission of the packet service of the shared channel in the satellite mobile communication system, the efficient transmission method of the packet service of the QoS guarantee of the satellite mobile communication system is provided, the QoS guarantee of the service QOS service quality can be ensured, meanwhile, key indexes such as service priority, waiting time and transmission rate are comprehensively considered, and efficient shared transmission of the packet service is realized.
The invention discloses a packet service high-efficiency transmission method for QoS guarantee of a satellite mobile communication system, wherein data service in the satellite mobile communication system is mapped into a temporary block flow at an MAC layer to realize multiplexing in a shared channel, and service bearing and the temporary block flow are in one-to-one correspondence, and the method comprises the following specific steps:
s1, traversing the states of all temporary block flows in a certain channel in the satellite mobile communication system, screening out all temporary block flows with data transmission requirements at the current moment, and storing the temporary block flows into a set A; the data sending requirement comprises a data retransmission requirement;
s2, calculating the dispatching priority of each temporary block flow in the set A, and sequencing all the temporary block flows from high to low according to the dispatching priority;
the step S2 of calculating the scheduling priority of each temporary block flow in step a specifically includes: scheduling priority P of temporary block flowsd＝Pi+Tw+PrIn which P isiAs priority of the ith traffic type, TwWaiting for scheduling time, P, for trafficrFor retransmitting data priority increments, PrThe influence coefficient on the priority is far less than PiThe influence coefficient of (a);
s3, calculating the length of the pre-sent data of each temporary block flow in the set A;
step S3, the calculating the length of the pre-sent data of each temporary block flow in step a specifically includes: the minimum transmission rate of the temporary block flow for guaranteeing the QoS is V minMaximum transmission rate of VmaxThe fixed retransmission block size generated in the temporary block streaming mode is LrWhen the data transmission requirement in the temporary block flow is a new data transmission requirement, the length of the pre-transmission data of the temporary block flow is Lt＝VminxT, where T is the slot length; when the data transmission requirement in the temporary block flow is the data retransmission requirement, the length of the pre-transmitted data of the temporary block flow is Lr。
S4, calculating the total pre-sending data length L of all temporary block flows in the set ALI.e. the sum of the lengths of the pre-sent data of all temporary block streams in the set a;
s5, comparison LLBurst load length L of data service transmission shared channel with satellite mobile communication systempriIf L is the size ofL≥LpriIf yes, go to step S8, otherwise go to step S6;
s6, calculating the length L of the spare load of the shared channelspare＝Lpri-LLReading the temporary block flow with the highest priority from the set A according to the order of the priority, and recording as Bmax,BmaxOf pre-transmission data length ofLt1Calculating the extended transmittable data length Lplus＝Lt1+Lspare；
S7, comparison LplusAnd BmaxMaximum transmission data length L ofmaxWherein L ismax＝VmaxT is the length of the data frame of the service transmission link of the satellite mobile communication system, VmaxTo guarantee the maximum transmission rate of QoS for the temporary block flow, if Lplus≥LmaxThen update B maxIs of pre-transmission data length Lt1Is LmaxUpdate LL＝LL+(Lmax-Lt1) A 1 to BmaxAdding the pre-sent data into the list to be multiplexed, and adding BmaxRemove from set A, execute step S6, otherwise update BmaxIs of pre-transmission data length Lt1Is LplusA 1 to BmaxAdding the pre-sent data into the list to be multiplexed, and executing step S11; the list to be multiplexed is used for storing the service data of each temporary block flow to be transmitted through the burst load of the shared channel;
s8, reading the temporary block flow with the highest priority from the set A in the descending order of priority, and recording as BmaxComparison BmaxIs of pre-transmission data length Lt1And shared channel burst load residual length Lpri-leftIf L is the size ofpri-left≥Lt1If yes, go to step S9, otherwise go to step S10;
s9, mixing BmaxAdding the pre-sent data into the list to be multiplexed, and updating Lpri-leftIs Lpri-left＝Lpri-left-Lt1A 1 to BmaxRemoving from the set A, executing step S8;
s10, from BmaxIs divided into the pre-transmission data with the length of Lpri-leftAdding the service data into a list to be multiplexed, and adding BmaxWaiting scheduling time TwThe time is increased to 1.5 times of the original waiting scheduling time, and if other unscheduled temporary block flows exist in the set A, the corresponding waiting scheduling time is increased to 2 times of the original waiting time;
and S11, filling the service data in the list to be multiplexed into the burst load.
The invention has the beneficial effects that:
in the invention, the maximum and minimum rates suggested by the service QoS are brought into the performance calculation method, thereby meeting the requirement of sharing transmission of the satellite packet service without influencing the use experience of users. The method of the invention is simple to realize, ensures the data transmission fairness among multiple services while ensuring the QoS of the services, and meets the requirements of priority and the access requirements of high-capacity users. The method of the invention considers the service retransmission data in the realization, thereby adapting to a plurality of RLC transmission modes.
Drawings
Fig. 1 is a schematic view of a multi-service scenario of a satellite mobile communication system according to the present invention.
FIG. 2 is a flow chart of the method of the present invention.
FIG. 3 is a schematic diagram showing the results of the method of the present invention.
Detailed Description
For a better understanding of the present disclosure, an example is given here.
Fig. 1 is a schematic diagram of a multi-service scenario of the system of the present invention, assuming that the duration of a shared channel is 5 time slots, where 3 terminals are multiplexed for 6 services, a service data block stream is represented by a temporary block stream, and state information of each temporary block stream is shown in table 1.
Table 1 state information of each temporary block flow in a channel
According to the method flow shown in fig. 2, T is screened, scheduled and multiplexed.
(1) Traversing all temporary block flows in the channel, screening out all temporary block flows with data transmission requirements (including data retransmission requirements) at the current moment, and storing the temporary block flows into a set A, namely A ═ B1, B2, B4, B5 and B6 };
(2) calculating the scheduling priority of each temporary block flow in the A, and sequencing the temporary block flows from high to low according to the priority;
scheduling priority P of temporary block flowsd＝Pi+Tw+PrIn which P isiAs a service type priority, TwWaiting for scheduling time, P, for trafficrFor retransmission of data priority addition, PrThe priority impact coefficient is much smaller than PiThe influence coefficient of (a);
the scheduling priority of each temporary block flow in the A is respectively as follows: 5.5, 5, 2, 3, and 6, and after the temporary block flows are sorted according to priority, the order of the temporary block flows in a is { B6(6), B1(5.5), B2(5), B5(3), and B4(2) }.
(3) Calculating the length L of the pre-sent data of each temporary block flow in At；
The minimum transmission rate of the temporary block flow for guaranteeing the QoS is VminMaximum transmission rate of VmaxThe fixed retransmission block size generated in the temporary block streaming mode is LrWhen the data transmission requirement in the temporary block flow is a new data transmission requirement, the length of the pre-transmission data of the temporary block flow is Lt＝VminxT, where T is a time slot; when the data transmission requirement in the temporary block flow is the data retransmission requirement, the length of the pre-transmitted data of the temporary block flow is L r；
Therefore, it can be calculated that the pre-transmission data length of each temporary block stream in a is: l isr、Lr、5Vmin、5Vmin、5Vmin。
(4) Calculating the total pre-transmission data length L of all temporary block flows in ALI.e. L of all temporary block streams in AtSum of where LL＝2Lr+15Vmin。
(5) Comparison LLAnd channel burst payload length LpriOf (2), assuming LL>Lpri。
(6) Reading a temporary block flow from A in priority order, namely T6, and comparing the pre-sending length LtAnd the burst remaining load length Lpri-leftAt this time Lt＝Lr<Lpri-left。
(7) According to LtCut into corresponding lengthsAdding the service data into the list to be multiplexed, and updating Lpri-leftThen continuing to read the next temporary block flow in priority order from A, namely the temporary block flow B1, and repeating (6), (7);
(8) assuming scheduling to temporary Block flow B5, L occurst>Lpri-leftIn this case with Lpri-leftService data with corresponding length is divided and added into a list to be multiplexed, and the waiting time of B5 is increased to 1.5 times of the original waiting time; b4 in A is not scheduled, and the corresponding waiting time is set to be 2 times of the original waiting time;
(9) the data is filled into the burst payload according to the list to be multiplexed, the result is shown in fig. 3.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (3)
1. A packet service high-efficiency transmission method for QoS guarantee of a satellite mobile communication system is characterized in that multiplexing of data services in a shared channel is realized by mapping the data services into temporary block flows in an MAC layer, service bearing and the temporary block flows are in a one-to-one correspondence relationship, and the method comprises the following specific steps:
s1, traversing the states of all temporary block flows in a certain channel in the satellite mobile communication system, screening out all temporary block flows with data transmission requirements at the current moment, and storing the temporary block flows into a set A;
s2, calculating the dispatching priority of each temporary block flow in the set A, and sequencing all the temporary block flows from high to low according to the dispatching priority;
s3, calculating the length of the pre-sent data of each temporary block flow in the set A;
step S3, the calculating the length of the pre-sent data of each temporary block flow in step a specifically includes: the minimum transmission rate of the temporary block flow for guaranteeing the QoS is VminMaximum transmission rate of VmaxThe fixed retransmission block size generated in the temporary block streaming mode is LrWhen the data transmission requirement in the temporary block flow is a new data transmission requirement, the length of the pre-transmission data of the temporary block flow is Lt＝VminxT, where T is the slot length; when the data transmission requirement in the temporary block flow is the data retransmission requirement, the length of the pre-transmitted data of the temporary block flow is L r；
S4, calculating the total pre-sending data length L of all temporary block flows in the set ALI.e. the sum of the lengths of the pre-sent data of all temporary block streams in the set a;
s5, comparison LLBurst load length L of data service transmission shared channel with satellite mobile communication systempriIf L is the size ofL≥LpriIf yes, go to step S8, otherwise go to step S6;
s6, calculating the length L of the spare load of the shared channelspare＝Lpri-LLReading the temporary block flow with the highest priority from the set A according to the order of the priority, and recording as Bmax,BmaxHas a pre-transmission data length of Lt1Calculating the extended transmittable data length Lplus＝Lt1+Lspare；
S7, comparison LplusAnd BmaxMaximum transmission data length L ofmaxWherein L ismax＝VmaxT is the length of the data frame of the service transmission link of the satellite mobile communication system, VmaxEnsuring the maximum transmission rate of QoS for the temporary block flow if Lplus≥LmaxThen update BmaxIs of pre-transmission data length Lt1Is LmaxUpdate LL＝LL+(Lmax-Lt1) A 1 to BmaxAdding the pre-sent data into the list to be multiplexed, and adding BmaxRemove from set A, execute step S6, otherwise update BmaxIs of pre-transmission data length Lt1Is LplusA 1 to BmaxAdding the pre-sent data into the list to be multiplexed, and executing step S11; the list to be multiplexed is used for storing the temporary block flows to be transmitted by the burst load of the shared channel Service data;
s8, reading the temporary block flow with the highest priority from the set A in the descending order of priority, and recording as BmaxComparison BmaxIs of pre-transmission data length Lt1And shared channel burst load residual length Lpri-leftIf L is the size ofpri-left≥Lt1If yes, go to step S9, otherwise go to step S10;
s9, mixing BmaxAdding the pre-sent data into the list to be multiplexed, and updating Lpri-leftIs Lpri-left＝Lpri-left-Lt1A 1 to BmaxRemoving from the set A, executing step S8;
s10, from BmaxIs divided into the pre-transmission data with the length of Lpri-leftAdding the service data into a list to be multiplexed, and adding BmaxWaiting scheduling time TwThe time is increased to 1.5 times of the original waiting scheduling time, and if other unscheduled temporary block flows exist in the set A, the corresponding waiting scheduling time is increased to 2 times of the original waiting time;
and S11, filling the service data in the list to be multiplexed into the burst load.
2. The method for efficient transmission of QoS-guaranteed packet services for a satellite mobile communication system according to claim 1, wherein the data transmission requirement of step S1 comprises a data retransmission requirement.
3. The method for efficiently transmitting packet services with guaranteed QoS in a satellite mobile communication system according to claim 1, wherein the step S2 of calculating the scheduling priority of each temporary block flow in step a specifically includes: scheduling priority P of temporary block flows d＝Pi+Tw+PrIn which P isiAs priority of the ith traffic type, TwWaiting for scheduling time, P, for trafficrIs the retransmission data priority increment.
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