CN112822725B - Wireless heterogeneous network multilink data distribution method based on service priority - Google Patents
Wireless heterogeneous network multilink data distribution method based on service priority Download PDFInfo
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- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
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Abstract
A wireless heterogeneous network multilink data distribution method based on service priority comprises the following steps: a. the multimode terminal equipment detects the accessible network set and acquires the parameters of the corresponding channels; b. classifying the transmission data by service, and calculating the data volume of the corresponding service; c. when a single network can not meet the service transmission requirement, selecting m networks and corresponding data distribution strategies according to the requirement of the service on network attributes and parameters of each network channel, and dividing service data into m sections of data packets with different sizes according to the distribution strategies; d. assigning the data packets to respective networks; e. and the core network recombines the data packet after receiving the data packet to complete the data transmission. According to different requirements of different power services on the network and parameters of each network channel, the size of the data packet is dynamically adjusted and distributed to different networks, so that the wireless data transmission efficiency, stability and data throughput can be improved, and further, the communication reliability and system performance are improved.
Description
Technical Field
The invention relates to a network multilink data distribution method, belonging to the technical field of communication.
Background
With diversification of power services and access of massive terminals, power communication networks are more and more complex, qoS requirements of different services are different, some power services require larger bandwidth and lower delay, and traditional power wireless private networks cannot meet service requirements. In order to meet the service requirements, various emerging wireless network technologies such as Wi-Fi, UWB, wiMAX,3G,4G, 5G and the like provide various selection modes for the current electric power communication network. Most wireless networks at the present stage have heterogeneous characteristics, can provide various service services, can provide service transmission of high-quality and massive data, form a power heterogeneous network by networking a private network and a public network, can effectively improve network capacity and data transmission rate by adopting a multi-network parallel access method, and can provide efficient and rapid network service for users. At present, there are not many network transmission methods that can be used for multi-network parallel access.
The existing multilink parallel transmission method considers system utility more, but the power service has difference, and the requirements of different service priorities on the network are different, such as network delay, bandwidth, bit error rate, cost and the like, so the existing multilink parallel transmission method often cannot meet the transmission requirements of power service data. Data distribution is an important link of multilink parallel transmission, so that it is necessary to find a data distribution strategy which is suitable for different power service requirements.
Disclosure of Invention
The invention aims to provide a wireless heterogeneous network multilink data distribution method based on service priority aiming at the defects of the prior art so as to adapt to the transmission requirements of different electric power service data.
The problems of the invention are solved by the following technical scheme:
a wireless heterogeneous network multilink data distribution method based on service priority comprises the following steps:
a. the method comprises the steps that the multi-mode terminal equipment UE detects an accessible network set and obtains parameters of corresponding channels, including bandwidth, time delay and error rate;
the UE classifies the service of the transmission data, determines the bandwidth requirement, the delay requirement and the error rate requirement of the service, and calculates the data size of the corresponding service;
c. when a single network can not meet the service transmission requirement, selecting m networks and corresponding data distribution strategies according to the requirement of the service on network attributes and channel parameters of the networks, and dividing service data into m segments of data packets with different sizes according to the selected distribution strategies, wherein each segment of data packet corresponds to a selected network;
d. allocating the data packets to corresponding networks to enable m sections of data packets to be transmitted in parallel;
e. and the core network recombines the data packets after receiving the data packets to complete the transmission of the power service data.
According to the wireless heterogeneous network multilink data distribution method based on the service priority, when the UE carries out service classification on transmission data, the data are divided into a high-priority service and a low-priority service, the high-priority service is a service requiring low time delay and high bandwidth, and the low-priority service is a service requiring high reliability and low cost.
For the service with high priority, the specific method for splitting the service data into m segments of data packets is as follows:
(1) setting the bandwidth requirement of high priority service as B h With a delay requirement of T h ；
(2) Obtaining total data size D of high priority service h ；
(3) The first m networks with the bandwidth from high to low are selected and marked as N j ', j =1,2,3 …, m, and satisfies
Wherein B is j J =1,2 …, m, for the bandwidth of network j;
(4) splitting the data into m data packets with different sizes, and respectively allocating the data packets to the selected m networks, wherein the size D of the data packet allocated by the network j h,j Comprises the following steps:
the wireless heterogeneous network multilink data distribution method based on the service priority comprises the following specific steps of splitting service data into m sections of data packets for low-priority services:
(1) setting bandwidth requirement of low priority service as B l With a delay requirement of T l Bit error rate requirement of E l ；
(2) Obtaining total data size D of low priority service l ；
(3) Selecting a match E i ＜E l Low bit error rate network set R j ,j＝1,2,3…,m；
(4) Model transmission cost
k j Is a transmission cost parameter, y, of the network j j Transmitting data packet D for network j j The desired time +>
Wherein B is j For the bandwidth of network j, j =1,2 …, m, to minimize cost, it should satisfy:
solving the above formula to obtain a low bit error rate network set R j Corresponding packet size: d = (D) 1 ,D 2 ,L,D m )。
Advantageous effects
According to different requirements of different power services on the network and parameters of each network channel, the size of the data packet is dynamically adjusted and distributed to different networks, so that the wireless data transmission efficiency, stability and data throughput can be improved, and further, the reliability of wireless communication and the overall performance of the system are improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a block diagram of the data distribution method of the present invention;
FIG. 2 is a flow chart of a data offloading method of the present invention;
fig. 3 is a high priority traffic data offloading policy;
fig. 4 is a low priority traffic data offloading strategy.
The symbols in the text are respectively expressed as: b is h Bandwidth requirement for high priority traffic, T h For the delay requirement of high priority traffic, D h Total data size for high priority traffic, B j Is the bandwidth of network j, D h,j Packet size allocated for network j, B l Bandwidth requirement for low priority traffic, T l Delay requirements for low priority traffic, E l For the bit error rate requirement, D l Total data size, R, for low priority traffic j For low bit error rate network aggregation, k j Is a transmission cost parameter, y, of the network j j Transmitting data packet D for network j j The time required.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present application will be described in detail, and clearly and completely with reference to the accompanying drawings.
When a plurality of links exist in the power heterogeneous network, the method divides data into data packets with different sizes, and allocates the data packets to the links in the network for simultaneous transmission. The size of the data packet is dynamically adjusted according to the requirements of time delay, safety, reliability and the like of different power services and is distributed to different networks, uplink data can be actively allocated according to the real-time bandwidth of a plurality of communication links and the size of respective real-time data volume, the transmission efficiency, stability and data throughput of wireless data are improved, and the reliability of wireless communication and the overall performance of a system are further improved.
The operation is carried out according to the following steps:
and (A) detecting the accessible network set by the multimode terminal equipment UE at the time t, and acquiring parameters such as bandwidth, time delay, error rate and the like of a corresponding channel.
And (B) at the time t, the UE classifies the transmitted data into high-priority services and low-priority services, determines the bandwidth requirement, the delay requirement and the error rate requirement of the services, and calculates the data volume of the corresponding services.
Step (C), when the single network can not meet the service transmission requirement, dividing the total service data into m sections of data packets with different sizes by a heterogeneous network multilink data distribution method based on service priority, wherein the specific method comprises the following steps:
(1) the bandwidth requirements corresponding to the high priority service and the low priority service are B h 、B l Delay requirement T h 、T l And bit error rate requirement E l
(2) Obtaining total data size D of different services h 、D l
(3) According to the service type, data is split into m data packets with different sizes:
high priority traffic requires low latency and high bandwidth:
1. the first m networks with the bandwidth from high to low are selected and marked as N j ', j =1,2,3 …, m, and is satisfied
2. Transmission delay of each network:
B j is the bandwidth of network j, D j The size of the data packet transmitted for network j, SNR is the signal-to-noise ratio, and the overall delay T min ＝max(T j ),j＝1,2…,m；
To minimize overall delay, each segment data size D h,j Taking:
low priority services require high reliability and low cost:
1. selecting a match E i ＜E l Low bit error rate network set R j ,j＝1,2,3…,n
2. Model transmission cost
k j Is a transmission cost parameter, y, of the network j j Time to occupy network j, y j ＝T j To minimize cost, should satisfy:
due to y j ＝T j And is made of
Therefore, the method comprises the following steps:
order to
g j (D j )＝D j ≥0，j＝1,2,3L m
The above equation can be converted into:
the formula (3) satisfies the K-T condition, so that D = (D) can be obtained by solving the formula by using K-T 1 ,D 2 ,L,D m )。
And (D) after the application layer finishes data splitting, utilizing a Stream Control Transmission Protocol (SCTP) to create m multi-Stream connections, wherein the multi-Stream characteristics of the Protocol ensure that the links do not interfere with the ordered Transmission. First, a sequence number of m pieces of data is sent on each link, and then the data of each link is started.
And (E) after the core network receives the data packets of each link, analyzing the first received data packet, and recombining m sections of data according to the sequencing codes.
The above is a detailed description of the present invention, and it can be seen from the above technical solutions that the method has the following advantages:
the method and the device select different data distribution strategies according to the service types and the requirements of the service types on different network attributes and the actual conditions of the network. The high-priority service needs low time delay and high bandwidth, and the invention can meet the service requirement by taking the lowest time delay as an optimization target under the condition of meeting the network bandwidth. The low-priority service needs high reliability and low cost, and the method fully considers the requirements, not only can screen out the network with higher reliability, but also can minimize the cost. According to the requirements of time delay, safety, reliability and the like of different power services, uplink data can be actively allocated according to the real-time bandwidth of a plurality of communication links and the size of respective real-time data volume, so that the transmission efficiency, stability and data throughput of wireless data are improved, and further the reliability of wireless communication and the overall performance of a system are improved.
Claims (2)
1. A wireless heterogeneous network multilink data distribution method based on service priority is characterized by comprising the following steps:
a. the method comprises the steps that the multi-mode terminal equipment UE detects an accessible network set and obtains parameters of corresponding channels, including bandwidth, time delay and error rate;
the UE classifies the service of the transmission data, determines the bandwidth requirement, the delay requirement and the error rate requirement of the service, and calculates the data size of the corresponding service;
c. when a single network can not meet the service transmission requirement, selecting m networks and corresponding data distribution strategies according to the requirement of the service on network attributes and channel parameters of the networks, and dividing service data into m segments of data packets with different sizes according to the selected distribution strategies, wherein each segment of data packet corresponds to a selected network;
d. allocating the data packets to corresponding networks to enable m sections of data packets to be transmitted in parallel;
e. the core network recombines after receiving the data packet, finish the transmission of the electric power service data;
when the UE classifies the service of the transmission data, the data is divided into a high-priority service and a low-priority service, wherein the high-priority service is a service requiring low time delay and high bandwidth, and the low-priority service is a service requiring high reliability and low cost;
for high-priority service, the specific method for splitting service data into m-segment packets is as follows:
(1) setting the bandwidth requirement of the high priority service as B h With a delay requirement of T h ；
(2) Obtaining total data size D of high priority service h ；
(3) Selecting the first m networks with bandwidth from high to low, and recording the networks as N' j J =1,2,3 …, m, and satisfies
Wherein B is j J =1,2 …, m, for the bandwidth of network j;
(4) splitting the data into m data packets with different sizes, and respectively allocating the data packets to the selected m networks, wherein the size D of the data packet allocated by the network j h,j Comprises the following steps:
2. the method for splitting the multilink data of the wireless heterogeneous network based on the service priority as claimed in claim 1, wherein for the low priority service, the specific method for splitting the service data into m data packets is as follows:
(1) setting bandwidth requirement of low priority service as B l With a delay requirement of T l Bit error rate requirement of E l ；
(2) Obtaining total data size D of low priority service l ；
(3) Selecting a match E i ＜E l Low bit error rate network set R j ,j＝1,2,3…,m；
(4) Model transmission cost
k j Is a transmission cost parameter, y, of the network j j Transmitting data packet D for network j j The desired time->
Wherein B is j For the bandwidth of network j, j =1,2 …, m, to minimize cost, it should satisfy:
solving the above formula to obtain a low bit error rate network set R j The corresponding packet size: d = (D) 1 ,D 2 ,…,D m )。
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