A method and system for establishing a connection

A connection establishment and service connection technology, applied in the field of communication, can solve problems such as complex operation and management of VCAT/LCAS

Inactive Publication Date: 2015-08-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Although VCAT (Virtual Concatenation, virtual concatenation) / LCAS (Link Capacity Adjustment Scheme, Link Capacity Adjustment Scheme) can also achieve lossless bandwidth adjustment, but due to VCAT / LCAS is more complicated to implement in terms of operation and management, and few manufacturers use it in OTN, so it is necessary to design a non-destructive adjustment solution suitable for ODUflex

Method used

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  • A method and system for establishing a connection
  • A method and system for establishing a connection
  • A method and system for establishing a connection

Examples

Experimental program
Comparison scheme
Effect test

application example 1

[0087] combine figure 1 Indicates that an ODUflex connection supporting G.HAO with a bandwidth of 2.5G is established between node A and node F. Suppose the selected route is {A, B, C, F}. Here are the steps to implement:

[0088] 1. According to the service bandwidth (2.5G) and link OPU2, OPU4 tributary timeslot rate, it can be seen that links AB and CF need 3 tributary timeslots, and link BC needs 2 tributary timeslots, so the maximum The number of time slots is 3.

[0089] 2. The control plane of node A constructs the PATH message in the RSVP-TE signaling, and reserves 3 time slot resources on the transmission plane. Node A sets Traffic Parameter according to the following requirements:

[0090] Signal Type is set to ODUflex;

[0091] H bit position 1;

[0092] The value of NMC (the number of multiplexed members) is set to 3 (in this example, the maximum number of slots is written into the NMC field);

[0093] The value of Bit Rate is set to 2.5G;

[0094] After the...

application example 2

[0100] combine figure 1 Indicates that an ODUflex connection supporting G.HAO with a bandwidth of 5G is established between node A and node F. Suppose the selected route is {A, D, E, F}. Here are the steps to implement:

[0101] 1. According to the service bandwidth (5G) and the tributary slot rate of links OPU2 and OPU3, it can be seen that 4 tributary slots are required on links AD and EF, and 5 tributary slots are required on link DE, so the maximum The number of slots is 5.

[0102] 2. The control plane of node A constructs the PATH message in the RSVP-TE signaling, and reserves resources of 5 time slots in the transmission plane. Node A sets Traffic Parameter according to the following requirements:

[0103] Signal Type is set to ODUflex;

[0104] H bit position 1;

[0105] The value of NMC is set to 5;

[0106] The value of Bit Rate is set to 5G;

[0107] After the PATH message is constructed, node A sends the PATH message to node D.

[0108] 3. After receiving ...

application example 3

[0113] combine figure 2 Explain that a unidirectional connection of ODUflex supporting G.HAO with a bandwidth of 5G is established between node A and node F. It is assumed that path computation is implemented by PCE. Here are the steps to implement:

[0114] 1. Node A requests the PCE to calculate an ODUflex connection supporting the G.HAO function with a bandwidth of 5G from A to F through the PCReq message.

[0115] 2. Assuming that the path selected by the PCE is {A, D, E, F}, according to the service bandwidth (5G) and the link OPU2, OPU3 tributary time slot rate, it can be seen that 5 tributary time slots are required on the links AD and EF , 4 tributary time slots are required on the link DE, so the maximum number of time slots is 5. The PCE sends the path and the maximum number of tributary time slots to node A through a PCRep message.

[0116] 3. The control plane of node A constructs the PATH message in the RSVP-TE signaling. Node A sets Traffic Parameter accord...

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Abstract

Disclosed are a method and a system for establishing a connection, wherein the method includes: initializing a connection establishment by a first node of service, indicating in the signalling message which initializes the connection establishment to establish an ODUflex connection meeting the demand of G.HAO; preserving resources by each node on a service connection path according to the maximal number of time slots from the numbers of time slots required by the links on the service connection path, and establishing the connection. The present invention may establish the ODUflex connection supporting the G.HAO function by means of the extended control plane signalling protocol.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for establishing a connection. Background technique [0002] The flexible transport container ODUflex (flexible optical data unit) defined by ITU-T proposes a new idea for carrying IP services and future services. The flexible and variable rate adaptation mechanism provided by ODUflex enables OTN (Optical Transport Network, Optical Transport Network) to efficiently carry all services including IP and maximize line bandwidth utilization. Currently, ITU-T defines two forms of ODUflex: one is ODUflex based on CBR (Constant Bit Rate, fixed bit rate) service, the rate can be arbitrary, and CBR service is encapsulated into this ODUflex through synchronous mapping; the other is It is an ODUflex based on packet services. The rate of this ODUflex is N times that of the HO ODU time slot. The packet services are encapsulated into ODUflex through GFP (Generic Framing Procedure,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00
CPCH04J3/1652
Inventor 鲍远林柯明陶慕柳
Owner ZTE CORP
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