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			Captured to Maximum payload in AD6LoWPAN? wiki page
								

	
	
			
	
		
		
	
	
		

	    
	    
	    		
Maximum payload in AD6LoWPAN?

		
	
				

			

									
					    NagarjunaG
					
							

            
            			
				
									
											
			
			
				
  •  Analog Employees  

			
			
			    	
			                    
                
				                on Jun 24, 2015 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
What is the maximum payload length the AD6LoWPAN data packet can carry? 

 
What is the size of the data packet being transmitted by the Node to the Border Router?

			

			
									
		                             
                        

    

                                            
                 max payload
                
                                                    
                 6lowpan payload
                
                                                    
                 payload in ad6lowpan
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 24, 2015 12:55 AM
            
            
						
			            		
    
		
								
	
    

		
		
    
		
    
                                
                                                            
    
					
    The maximum application payload in the AD6LoWPAN node depends on the header compression (HC). 
    
 

    
 
      
  
    • Without  Header Compression, the maximum payload length = 323 bytes
      • 
  
    • With Header Compression (HC), the maximum payload length = 346 bytes
      • 
 
    
 

    
 
    This max payload value is derived from the formula given in the table. Also shown in are values of the parameters and the calculations for the application payload. 
    
 
    
  
    
   
    
    
     
    Formula
    		
    
    
    
    
     

    Application Payload Size =  (Max Buffer Size) - (PHY + MAC + 6LoWPAN + IPv6 + UDP)

    		
    
    
    
    
     
    Parameter
    		
     
    Value (Bytes)
    		
    
    
    
    
     
    Max Buffer Size 
    		
     
    400
    		
    
    
    
    
     
    UDP Header Size
    		
     
    8
    		
    
    
    
    
     
    IPv6 Header Size
    		
     
    40
    		
    
    
    
    
     
    6LoWPAN Header Size
    		
     
    2/19
    		
    
    
    
    
     
    MAC Header Size
    		
     
    21
    		
    
    
    
    
     
    MAC Footer Size(CRC)
    		
     
    4
    		
    
    
    
    
     
    PHY Header Size
    		
     
    2
    		
    
    
    
    
     
    Calculations
    		
    
    
    
    
     
    Without AD6LoWPAN Header Compression
    		
    
    
    
    
     
    Max Buffer Size = 400.
    (PHY + MAC + 6LoWPAN (uncompressed) + IPv6 + UDP) = 77.
    Application Payload Size  = (400 – 77)= 323 Bytes <== (with No HC)
    		
    
    
    
    
     
    With AD6LoWPAN Header Compression
    		
    
    
    
    
     
    Max Buffer Size = 400.
    (PHY + MAC + 6LoWPAN (compressed) + UDP) = 54.
    Application Payload Size  = (400 – 54)= 346 Bytes  <== (with HC)
    (In this case IPv6 Header is compressed and replaced with 19 bytes of 6LoWPAN Header.)
    		
    
    
       
  
    
 
    
 
      Please note, the AD6LoWPAN uses Fragmentation mechanism for delivering any packet with payload more than 50 bytes.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on May 8, 2019 6:40 AM
            
            
						
			            		
    
		
								
	
    

		
		
    
		
    
                                
                                                            
    
					
    This question has been closed by the EZ team and is assumed answered.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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