Page 758 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 9-21 – Derived framing parameters

Parameter Definition
ANDR The aggregate net data rate:
ANDR  NDR DS  NDR US

RTxOH The retransmission overhead needed to protect against the worst-case impulse noise
environment as configured in the DPU-MIB and stationary noise.
RTxOH  REIN _ OH  SHINE_ OH  STAT _ OH
with
If INP_min_rein > 0:
  f    1
REIN _OH  (INP _ min_ rein  ) 1  floor   DMT   

  f REIN  
with fREIN, the repetition frequency of REIN in kHz.
If INP_min_rein=0 then REIN_OH=0
SHINE_ OH  SHINEratio

4
STAT _OH  10
where STAT_OH is the statistical overhead due to retransmission
ETR The expected throughput in kbit/s:
ETR = 1( RTxOH ) NDR

ETR_min_eoc (Note The minimum expected throughput including the eoc rate:
4) ETR_min_eoc=ETR_min + (1-RTxOH)x(DPReoc – 1000 kbit/s)

NOTE 1 – f D is either f US for upstream or f DS for downstream.
D D
NOTE 2 – This 1000 kbit/s is a reference value for the eoc overhead channel rate for the purpose of this calculation.
NOTE 3 – The value of B eoc-max is the maximum number of eoc bytes per logical frame defined in Table 6-1 and Table X.1, and
is the total number of subcarriers in the downstream MEDLEY set.
NOTE 4 – The ETR_min_eoc is calculated by the FTU as the value of the ETR_min control parameter, increased by the expected
throughput corresponding to the maximum eoc data rate allowed for the profile.
9.8.3 Performance related parameters

9.8.3.1 Definition of mean time between error events (MTBE)

Mean time between error events (MTBE) is the average number of seconds between two error events. An
error event is defined as a block of one or more consecutive uncorrected DTUs. The MTBE is referenced to
the output of the PMS-TC function after retransmission (i.e., the  reference point at the receiver side).
If each error event consists of a single corrupted DTU (which is typical for stationary noise environment),
MTBE can be calculated as:
_
= ( )
_ _ _

where:
MTBE is expressed in seconds.
Measurement_Time is expressed in seconds.
Number_of_uncorrected DTUs is the number of rtx-uc anomalies (see clause 11.3.1.1) over the
measurement time.
9.8.3.1.1 Definition of MTBE_min

The minimum MTBE (MTBE_min) is defined as 14 400 seconds.

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