Page 1256 - 5G Basics - Core Network Aspects

2 Transport aspects

Annex D

Generic mapping procedure principles
(This annex forms an integral part of this Recommendation.)

D.1 Basic principle
For any given CBR client signal, the number of n-bit (e.g., n = 1/8, 1, 8) data entities that arrive during one
server frame or server multiframe period is defined by:
 f 
c n   client T server  (D-1)
 n 

fclient: client bit rate
Tserver: frame period of the server frame or server multiframe
cn: number of client n-bit data entities per server frame or server multiframe

As only an integer number of n-bit data entities can be transported per server frame or multiframe, the
integer value Cn(t) of cn has to be used. Since it is required that no client information is lost, the rounding
process to the integer value has to take care of the truncated part, e.g., a cn with a value of 10.25 has to be
represented by the integer sequence 10,10,10,11.
 f client 
C n t) (  int  T server  (D-2)
 n 
Cn(t): number of client n-bit data entities per server frame t or server multiframe t (integer)

For the case cn is not an integer, Cn(t) will vary between:
 f client 
C n t) (  floor  T server  (D-3)
 n 

and
 f client   f client 
C n    ceilingt  T server  1  floor  T server  (D-4)
 n   n 

The server frame or multiframe rate is defined by the server bit rate and the number of bits per server
frame or multiframe:
B server
T server  (D-5)
f server

fserver: server bit rate
Bserver: bits per server frame or multiframe
Combining (D-5) with (D-1) and (D-2) results in:

 f client B server 
c n       (D-6)
f
 server n 

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