Data link detection method, device and system, controller and gateways

[0087] Preferred embodiment one

[0088] Picture 8 It is a schematic diagram of the structure of the data link detection system according to the first preferred embodiment of the present invention, such as Picture 8 As shown, the system includes SDN controller 702 and UGW1 and UGW2, where UGW1 and UGW2 are equivalent to Figure 7 In the gateway 704. In the case of a pair of UGW, UGW1 is equivalent to the gateway 704, UGW2 is equivalent to the GTP endpoint, at the same time, UGW2 is also equivalent to the gateway 704, and UGW1 is equivalent to the GTP endpoint.

[0089] After the SDN controller 702 establishes an OF connection with UGW1 and UGW2, the SDN controller 702 delivers the GTP user plane context information to UGW1 and UGW2. The context information includes GTP-U keep-alive related parameter information, which may include At least one of the following: timer information, counter information, header information.

[0090] The timer information may include at least one of the following parameters: timer t1 and corresponding maximum time interval T1; timer t2 and corresponding maximum time interval T2. The counter information may include the following parameters: counter n1 and the corresponding maximum number of times N1. The header information may include at least one of the following parameters: the version in the GTP header, the protocol type (PT), the network protocol data unit (Network Protocol Data Unit, N-PDU), and the extension header The indicator bit (Extension Header Flag, referred to as E), the indicator bit of the sequence number (Sequence Number Flag, referred to as S), the indicator bit of the N-PDU number (N-PDU Number flag, referred to as PN), the message type ( Message Type), length (length), TEID, SN, extended header and other information; GTP message destination address, source address, destination port number, source port number, protocol type.

[0091] The maximum value T1 of the timer t1 is the maximum time value for waiting for the arrival of the echo response message after the SDN controller sends the echo request message. The maximum value of the timer t1 is defined as T3-RESPONSE in the standard, and is represented by T1 in this embodiment.

[0092] Among them, the maximum value N1 of the counter n1 is the maximum number of times the SDN controller resends the echo request message. The maximum value of the counter n1 is defined as N3-REQUESTS in the standard, and is represented by N1 in this embodiment.

[0093] Among them, the maximum value T2 of the timer t2 is the sending interval timer of the echo request message.

[0094] In this embodiment, the context information of the GTP user plane may be carried on the flow table modification request (OFP_Table_mod_request) message or the greeting (Hello) message of the OF protocol. The context information is filled in the corresponding field of the flow table modification request message or the greeting message of the OF protocol in the format of multiple or one cell.

[0095] The above SDN controller 702 delivers the context information of the GTP user plane to UGW1 and UGW2 in no inevitable sequence, and may be sent to UGW1 first, or sent to UGW2 first, or simultaneously.

[0096] After UGW1 and UGW2 receive the context information of the GTP user plane, they generate an echo request message according to the context information of the GTP user plane, and send the echo request message to the opposite ends, namely UGW2 and UGW1, respectively. After receiving the echo request message from the opposite end, return an echo response message to the opposite end, and perform periodic data link detection operations between UGW1 and UGW2. Among them, UGW2 is equivalent to the second UGW.

[0097] Preferred embodiment two

[0098] Picture 9 It is a schematic diagram of the data link detection system according to the second preferred embodiment of the present invention, such as Picture 9 As shown, the system includes an SDN controller 702 and UGW1, and a traditional GTP endpoint 902. Among them, UGW1 is equivalent to Figure 7 In the gateway 704.

[0099] After the SDN controller 702 establishes the OF connection with UGW1, it delivers the GTP user plane context information to UGW1. The context information includes GTP-U keep-alive related parameters. The specific parameters are the same as in the first embodiment, and will not be repeated here. .

[0100] The context information of the GTP user plane can be carried on the flow table modification request (OFP_Table_mod_request) message or the greeting (Hello) message of the OF protocol. The context information is filled in the corresponding field of the flow table modification request message or the greeting message of the OF protocol in the format of multiple or one cell.

[0101] After UGW1 receives the context information of the GTP user plane, it sends an echo request message to the traditional GTP endpoint 902 according to the context information of the GTP user plane, and after receiving the echo request message from the traditional GTP endpoint 902, it sends the echo request message to the opposite end, the traditional GTP endpoint 902 returns an echo response message, and performs periodic data link detection operations between UGW1 and the wound pain GTP endpoint 902.

[0102] Preferred embodiment three

[0103] Picture 10 It is a flowchart of the data link detection method according to the preferred embodiment 3 of the present invention. Picture 10 Among them, one end of the GTP is UGW1 controlled by the SDN controller, and the other end is a traditional GTP endpoint, such as a traditional S-GW, P-GW, ePDG, or eNB. Such as Picture 10 As shown, the process includes the following steps:

[0104] Step S1002, the SDN controller sends the context information of the GTP user plane to UGW1.

[0105] After the SDN controller establishes an OF connection with UGW1, the SDN controller issues GTP user plane context information to UGW1, the context information includes GTP-U keep-alive related parameters, and the parameters may include at least one of the following: timer information , Counter information, header information.

[0106] The timer information may include at least one of the following parameters: timer t1 and corresponding maximum time interval T1; timer t2 and corresponding maximum time interval T2. The counter may include the following parameters: counter n1 and the corresponding maximum number of times N1. The header information may include at least one of the following parameters: version, PT, E, S, PN, message type, length, TEID, SN, N-PDU, extended header and other information in the GTP header ; GTP message destination address, source address, destination port number, source port number, protocol type.

[0107] The maximum value T1 of the timer t1 is the maximum time value for waiting for the arrival of the echo response message after the SDN controller sends the echo request message. The maximum value of the timer t1 is defined as T3-RESPONSE in the standard, and is represented by T1 in this embodiment.

[0108] Among them, the maximum value N1 of the counter n1 is the maximum number of times the SDN controller resends the echo request message. The maximum value of the counter n1 is defined as N3-REQUESTS in the standard, and is represented by N1 in this embodiment.

[0109] Among them, the maximum value T2 of the timer t2 is the sending interval timer of the echo request message.

[0110] In this embodiment, the context information of the GTP user plane may be carried on the flow table modification request (OFP_Table_mod_request) message or the greeting (Hello) message of the OF protocol. The context information is filled in the corresponding field of the flow table modification request message or the greeting message of the OF protocol in the format of multiple or one cell.

[0111] Steps S1004~S1010, after UGW1 receives the context information of the GTP user plane, it generates an echo request message according to the context information of the GTP user plane, and sends an echo request message to the traditional GTP endpoint, and after receiving the echo request message from the traditional GTP endpoint , Return an echo response message to the opposite end, and perform periodic link detection operations between UGW1 and GTP traditional endpoints. Traditional GTP endpoints perform operations according to existing mechanisms.