KR101524144B1 - System and method for managing bus load of vehicle network - Google Patents

Abstract

A system and a method for managing a bus load in a vehicle network according to the present invention specifies a first route candidate from a route table when there is a bus load confirmation request, calculates a bus load of each communications link included in the specified first route candidate based on the first route candidate and a bandwidth of a gateway, and controls a route of a communications link between gateways based on the calculated bus load.

Description

[0001] SYSTEM AND METHOD FOR MANAGING BUS LOAD OF VEHICLE NETWORK [0002]

The present invention relates to a bus load management system and method for a vehicle network.

Ethernet communication is being developed as an in-vehicle backbone network as a large capacity / high speed communication system is required due to an increase in the number of in-vehicle controllers and an increase in demand for multimedia services. A method of processing data by a gateway in such a vehicular network system is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 10-2013-0016809 (published on Mar. 19, 201) and Japanese Unexamined Patent Application Publication No. 10-2002-0045465 .
Network bus load management is an important factor in communication reliability when developing a vehicle network, and bus load management is also required in the development of an Ethernet network.

In this paper, we propose a bus load balancing scheme that can distribute traffic over other communication links in case of excessive bus load on the communication link used when applying the Ethernet backbone network connecting the gateway to the vehicle network.

A method of managing a bus load of a vehicle network according to the present invention includes receiving a bus load confirmation request message, specifying a first route candidate from a route table according to the bus load confirmation request message, Calculates the bus load of each communication link included in the first route candidate on the basis of the bandwidth of the inter-gateway communication link, and controls the route of the inter-gateway communication link based on the calculated bus load.

The route table according to the present invention includes at least one route candidate per priority order, and the route candidate means a candidate available as a route of the communication link between the gateways.

The route table according to the present invention is characterized by including a route identifier for identifying each route candidate.

The priority of the route candidate and the route candidate included in the route table according to the present invention is updated using at least one of the available bandwidth, the data communication delay value, and the communication link state information.

The first route candidate according to the present invention is specified in consideration of the priority among a plurality of route candidates included in the route table.

The first route candidate according to the present invention is characterized in that the master gateway is determined by determining a route identifier in consideration of the priority among a plurality of route candidates and extracting a route candidate corresponding to the determined route identifier from the route table do.

The step of calculating the bus load according to the present invention includes the step of specifying a gateway in charge based on the communication link and the charge link table included in the first route candidate, And calculates a bus load.

The charge link table according to the present invention is characterized by defining a gateway responsible for bus load calculation for each communication link.

The step of controlling the route of the inter-gateway communication link according to the present invention includes the steps of: comparing the calculated bus load of each communication link with the bus load allowable limit, and determining at least one communication having a bus load larger than the bus load allowable limit And a route of the inter-gateway communication link is controlled based on the result of the check.

The method of managing a busload of a vehicle network according to the present invention comprises setting the first route candidate to a route of the inter-gateway communication link when there is not at least one communication link having a bus load greater than the bus load tolerance .

A bus load management method of a vehicle network according to the present invention is characterized by calculating a bus load of each communication link based on a second route candidate when there is at least one communication link having a bus load larger than the bus load tolerance, And controls the route of the inter-gateway communication link based on the calculated bus load.

The second route candidate according to the present invention is a route candidate of a lower rank than the first route candidate.

The bus load management system of a vehicle network according to the present invention is characterized in that when there is a bus load confirmation request, it identifies a first route candidate from the route table, and based on the bandwidth of the specified first route candidate and the gateway, And a gateway for controlling the route of the inter-gateway communication link based on the calculated bus load.

The gateway according to the present invention calculates the bus load of the communication link in charge based on the communication link and the charge link table included in the first route candidate, and the charge link table includes a gateway .

The gateway according to the present invention compares the calculated bus load of each communication link with the bus load allowable limit and confirms whether there is at least one communication link having a bus load larger than the bus load allowable limit, To-gateway communication link is controlled based on the gateway-to-gateway communication link.

The gateway according to the present invention calculates the bus load of each communication link based on the second route candidate when there is at least one communication link having a bus load larger than the bus load allowable limit, To-gateway communication link is controlled based on the gateway-to-gateway communication link.

When the Ethernet backbone technology capable of high capacity and high speed communication is applied, the bus load of the communication link is maintained at an appropriate level, thereby ensuring important communication reliability in development of vehicle network technology. In addition, since the high-capacity high-speed communication securing the reliability is implemented in the vehicle, application of the ADAS system utilizing the high-capacity image data and expansion of the service using the external high-speed infrastructure network can be facilitated.

1 is a schematic diagram of a bus load management system of a vehicle network according to an embodiment of the present invention.
2 is a flowchart illustrating a method of controlling a route of a communication link between gateways using a route table in the bus load management system 100 according to an embodiment of the present invention.
3 is a flowchart illustrating a method of determining a route of a communication link between gateways based on a bus load tolerance limit, according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

The vehicle network of the present invention may be based on AVB (Audio Video Bridge) Ethernet protocol. In the AVB network environment, it can operate in units of AVB cloud composed of one master gateway (master gateway) and a plurality of slave gateways (slave gateways). In this specification, a gateway is understood as a concept including both the master gateway and the slave gateway. In this specification, a bus load management system and method of a vehicle network are described based on an AVB cloud composed of four gateways, but the inventive principle can be applied regardless of the number of gateways.

1 is a schematic diagram of a bus load management system of a vehicle network according to an embodiment of the present invention.

Referring to FIG. 1, a bus load management system of a vehicle network includes a plurality of gateways, and one of the plurality of gateways may be set as a master gateway. In addition, a plurality of gateways are interconnected through a communication link, and in this case, they must be connected in an open loop form.

Specifically, in order for the four gateways of Fig. 1 to be connected, three communication links must be set up. If four or more communication links are set up, the four gateways may be connected in the form of a close loop to cause a communication error. Therefore, only three of the six communication links of Fig. 1 are set up, and the remaining communication links must be blocked. The communication links (①, ②, ④) indicated by the solid lines in FIG. 1 are set up, and the communication links (③, ⑤, ⑥) indicated by dotted lines are blocked. Therefore, it can be seen that the route of the current gateway-to-gateway communication link is set to (2) - (1) - (4).

If the route of the communication link between gateways is set to ②-①-④, look at the bus load that occurs on each communication link. Here, it is assumed that the bandwidth (bandwidth) of the gateway 1 is 30 Mbps and the gateways 2 and 3 are respectively 20 Mbps. In the communication link 2, a bus load of 30 Mbps including 20 Mbps transmitted from the gateway 2 and other vehicle control data 10 Mbps is generated. The communication link ① generates a bus load of 60 Mbps including 20 Mbps that is transmitted from Gateway 2, 30 Mbps transmitted from Gateway 1, and other vehicle control data of 10 Mbps. The communication link ④ generates a bus load of 80 Mbps including 20 Mbps transmitted from each of the gateways 2 and 3, 30 Mbps transmitted from the gateway 1, and 10 Mbps other vehicle control data. That is, under the currently set communication link route (2 - - - - - 4), a relatively large amount of data is transmitted to the communication link 4 as compared with other communication links. In this case, the master gateway can change the route of the currently established communication link to balance the bus load, which will be described in detail below with reference to FIG. 2 to FIG.

2 is a flowchart illustrating a method of controlling a route of a communication link between gateways using a route table in the bus load management system 100 according to an embodiment of the present invention.

Referring to FIG. 2, a bus load confirmation request message may be received (S200). Here, the bus load confirmation request message may mean a command signal requesting to calculate a bus load occurring in each communication link. The bus load confirmation request message may be transmitted from the master gateway to each gateway.

If there is a bus load calculation request of each communication link according to the bus load confirmation request message, the first route candidate may be identified from the route table (S210).

(One) Route  table

The route table may include one or more route candidates on a priority basis. A route candidate may mean a candidate that is available as a route to a communication link between gateways. Specifically, the route candidate may indicate a connection order of the communication link. In addition, the route table may allocate a route identifier to each of the route candidates in order to identify each of the plurality of route candidates. For example, the route table of the present invention can be generated as shown in Table 1 below.

Route identifier Route candidate Priority One ②-①-④ One 2 ②-⑤-④ 2 3 ②-③-④ 3 : : :

Referring to Table 1, the route table includes a route identifier for specifying a route candidate, and includes a plurality of route candidates for each priority. Here, the lower the priority, the higher the priority.

Meanwhile, the route candidates included in the route table and the priorities can be updated at predetermined intervals using at least one of the available bandwidth, the data communication delay value, and the communication link status information. Here, the communication link status information may include a settable communication link, a currently set up route.

(2) First Route  Candidate-specific method

The first route candidate may be specified in consideration of the priority among a plurality of route candidates. For example, a route candidate having the highest priority, that is, the lowest priority among a plurality of route candidates in the route table, can be specified. Alternatively, the first route candidate may be specified based on the route identifier. For example, the master gateway can determine the route identifier in consideration of the priority and transmit it to each gateway. The gateway can extract a route candidate corresponding to the transmitted route identifier from the route table described above. To this end, all gateways may have the same route table.

The bus load of the communication link included in the first route candidate may be calculated using the bandwidth of the first route candidate and the gateway (S220).

Specifically, the bus load of each communication link included in the first route candidate can be calculated at the gateway connected to the corresponding communication link. However, referring to FIG. 1, since the communication link 1 connects the gateway 1 and the gateway 2, the gateway 1 and the gateway 2 repeatedly calculate the bus load on the communication link 1, respectively. In order to eliminate such redundancy, a link table for defining the correspondence between the gateway and the communication link can be used. That is, it is possible to specify the gateway in charge based on the communication link included in the first route candidate and the charge link table, and calculate the bus load of the communication link occupied by the specified gateway in charge. Here, the charge link table defines gateways to be responsible for bus load calculation for each communication link. For example, the charge link table of the present invention can be implemented as shown in Table 2 below.

Gateway No. Communication link One ①, ② 2 ④ 3 ③, ⑥ 4 ⑤

Referring to Table 2, when the communication links 1 and 2 exist in the first route candidate, the gateway 1 can calculate the bus load occurring in the communication links 1 and 2. Similarly, when there is a communication link 4 in the first route candidate, the gateway 2 is connected to the gateway 3 when the communication links 3 and 6 exist, and when the communication link 5 exists, The load can be calculated. The charge link table according to Table 2 is only one embodiment, and can be variously determined within a range in which one communication link is not redundantly handled in two or more gateways. On the other hand, the charge link table may be randomly determined each time the bus load is calculated, or may be stored in advance in the bus load management system.

The route of the inter-gateway communication link of the vehicle network may be controlled based on the bus load calculated in step S220 (S230). A method of controlling a route based on the bus load of each communication link will be described with reference to FIG.

3 is a flowchart illustrating a method of determining a route of a communication link between gateways based on a bus load tolerance limit, according to an embodiment of the present invention.

Referring to FIG. 3, the bus load of each communication link may be compared with the bus load tolerance (S300). Here, the bus load tolerance value may mean a threshold value or a maximum value of the bus load allowed for the communication link.

As a result of the comparison of step S300, it can be determined whether there is at least one communication link having a bus load larger than the bus load allowable limit (S310).

If it is determined in step S310 that there is no communication link having a bus load larger than the bus load allowable limit, the first route candidate used in calculating the bus load of each communication link may be set as a route of the inter- (S320).

However, if it is determined in step S310 that there is more than one communication link having a bus load larger than the bus load allowable limit, the bus load of each communication link may be calculated based on the second route candidate (S330). Here, the second route candidate may mean a route candidate of a lower rank than the first route candidate. Further, the second route candidate can be specified based on the route identifier determined by considering the priority of the master gateway. The method of calculating the bus load of the communication link has been described in detail with reference to FIG. 2, and a detailed description thereof will be omitted here.

Then, the calculated bus load is compared with the bus load allowable limit (S300), and it is determined whether there is at least one communication link having a bus load larger than the bus load allowable limit (S310). The bus load calculation according to the subordinate route candidates in step S330 and the comparison with the bus load allowable limit in step S300 can be repeatedly performed until there is no bus load larger than the bus load allowable limit.

Claims (18)

Receiving a bus load confirmation request message;
Identifying a first route candidate from the route table according to the bus load confirmation request message;
Calculating a bus load of each communication link included in the first route candidate based on the bandwidth of the specified first route candidate and the gateway; And
And controlling the route of the inter-gateway communication link based on the calculated bus load,
Wherein the route table comprises at least one route candidate per priority, and the route candidate means a candidate available as a route of the communication link between the gateways. delete The method according to claim 1,
Wherein the route table includes a route identifier that identifies each route candidate. The method of claim 3,
Wherein the priority of the route candidates and the route candidates included in the route table is updated using at least one of an available bandwidth, a data communication delay value, and a communication link state information,
Wherein the communication link status information comprises a settable communication link and a currently set up route. The method according to claim 1,
Wherein the first route candidate is specified in consideration of a priority among a plurality of route candidates included in the route table. 2. The method of claim 1, wherein the step of specifying the first route candidate comprises:
The master gateway determining a route identifier considering a priority among a plurality of route candidates; And
And extracting a route candidate corresponding to the determined route identifier from the route table,
And the extracted route candidate is identified as the first route candidate. 2. The method of claim 1, wherein the calculating the bus load comprises:
And specifying a gateway in charge based on the communication link and the charge link table included in the first route candidate,
And the specified charge gateway calculates the bus load of the communication link in charge. 8. The method of claim 7,
Wherein said charge link table defines a gateway responsible for bus load calculation for each communication link. 2. The method of claim 1, wherein controlling the route of the inter-
Comparing the calculated bus load of each communication link with a bus load allowable limit value;
Determining if there is at least one communication link having a bus load greater than the bus load tolerance; And
And controls the route of the inter-gateway communication link based on the result of the checking. 10. The method of claim 9,
And if the at least one communication link is not present, sets the first route candidate to a route of the inter-gateway communication link. 10. The method of claim 9,
If the at least one communication link is present, calculating a bus load of each communication link based on a second route candidate; And
And controlling the route of the inter-gateway communication link based on the calculated bus load. 12. The method of claim 11, wherein the second route candidate is a route candidate of a subordinate to the first route candidate. If there is a bus load confirmation request, specifies a first route candidate from the route table, and calculates a bus load of each communication link included in the first route candidate based on the bandwidth of the specified first route candidate and gateway And a gateway for controlling a route of the inter-gateway communication link based on the calculated bus load,
Wherein the route table includes at least one route candidate and a route identifier that identifies the respective route candidate by priority, and the route candidate means a candidate available as a route of the inter-gateway communication link. Bus load management system. delete 14. The method of claim 13,
Wherein the first route candidate is specified in consideration of a priority among a plurality of route candidates included in the route table. 14. The gateway according to claim 13,
Calculating a bus load of the communication link in charge based on the communication link included in the first route candidate and the charge link table,
Wherein said charge link table defines a gateway responsible for bus load calculation for each communication link. 14. The gateway according to claim 13,
Comparing the calculated bus load of each communication link with a bus load tolerance, verifying that there is at least one communication link having a bus load greater than the bus load tolerance, And controls the route of the link. 18. The gateway according to claim 17,
And if the at least one communication link exists, calculating a bus load of each communication link based on the second route candidate, and controlling a route of the inter-gateway communication link based on the calculated bus load However,
And the second route candidate is a route candidate of a lower rank than the first route candidate.

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