Sometimes your system may generate an error code indicating that the ns2 error pattern is specified. This problem can have several causes.
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n corresponds to the models described in chapter 13. ThisBugs can be set along the way to cause packages to fail, as described in various documents.probability distributions. These error patterns are simple and not needed.be sure to match what could be seen firsthand on a real satellitechain (especially the fabulous LEO chain). ordinary usersfreely define more complex error blocks that are closer togetherspecific satellite environment.
The code below is a good example of how to enter an error pattern inLabel:
set em_ [new error template]$em_ unit pt$em_ set rate_ 0.02$em_ranvar [new random/universal variable]interface error model $node $em_
They have the option to add an error template to this first interface getting path.node created$nodes (especially between MAC and link layer I would say) -this first HMI usually corresponds to the uplink in combination with the downlinkInterface to a suitable satellite or terminal (if one uplink and/or downlinkexist ).To add the error model in its entirety to another stack (indexed with permission), usethe following code:
Interface error template $node $em_ $i
This section documents some of the error model objects associated with it several times.NetDevice models are currently supported as part of the
Mistake women are used to indicate where the package should appear.be wrong, depending on the cause (perhaps stochastic orempirical) error model.
The root of code error patterns is displayed in the
In general, there are two types of error models. The former are stochasticmodels. In some cases packages will not work depending on the base variable.random distributions. An example of this is
RateErrorModel.Various other types of m The divisions are other deterministic or empirical models in whichFailed packets usually follow a certain written pattern.An example is
ListErrorModel where users can specifynumber of bad packets by writing specific packet UIDs.
ns3::RateErrorModel packages based on base valuerandomly variable distribution that defaults to UniformRandomVariabledistributes a between 0.0 and 1.0. Error rate and device errors (bit,bytes, packet) or user defined. For example, set the ErrorRateAt 0.1 and ErrorUnit you can “pack” about 10% in the long run.Packets lost.
Error models are ns-3 objects and can be built usingThe associated model is
CreateObject<>(). They have customization attributes.
The ErrorModel can be applied anywhere, it’s common but often usedNetDevice simulates these artificial losses (simulating direct losses)can be called.
Scope And Restrictions¶
No known restrictions. There is none andfrom existing ones that many models are trying to modify.the packet it contains (for example, applying byte or bit errors to byte buffers).This type of operation is likely to require a lot of performance and alsoPackage APIs may not make this easy.
The ns-3 spectrum model and the manufacturers that produce it (eg, LTE).their own base error pattern symbol found in
bool ErrorModel::IsCorrupt (Ptr: evaluate this andReturns package true, alias false, regardless of whether the package is considered to be in error.Some patterns may change the contents of the packet bit buffer you see.
void ErrorModel::Reset (void): any reset condition.
void ErrorModel::Enable (void): enable ErrorModel::Disble
void (empty): disable template; IsCorrupt() willalways returns bad.
bool ErrorModel::IsEnabled (void) const: returns the enabled state
Many ns-3 network devices contain hold attributes that are related to errors.models. The error model is applied last to the theoryethical physical level.All device processing chain and drops must point to
PhyRxDrop.The trace source associated with the device. It is common knowledge that the following elements contain the attributewith any available pointer type to store this design and error model style:
Virtual network device
However, ErrorModel can certainly be used anywhere packages are clearly used
What type of data does its model create? What are the key leads?Sources? What type of output log can be enabled?
Error patterns are used in
examples/error-model/ directory of the website contains an example
simple-error-model.cc practice listing error models and evaluate them.
The device test suite
error-model provides a single test casespecific combination of ErrorRate and ErrorUnit
RateErrorModel applied one to
Detecting the transfer of ErrorModel, easy RateErrorModel and ListErrorModel classesfrom ns-2 to ns-3 in 2007. Then ReceiveListErrorModel was addedtime.
The error packet template is explicitly attributed to Truc Anh N. Nguyen.University of Kansas (James P.G. Sterbenz
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