Page 1083 - 5G Basics - Core Network Aspects

Transport aspects 2

The upstream example in Figure VI.3(b) is a similar configuration as for the downstream. In all lines the
DRA/VCE has set TIQ=0. For line 3 in the logical frame with the sync symbol, an alternate valid configuration
for the DO parameters are TTR=3, TBUDGET=5, and TA=2, where the index of the last symbol interval
eligible for data is TBUDGET+TA-1=5+2-1=6, but the derived parameters have B'=2 and B=1.

s; = M × T seconds) s; = M F × T seconds)
F
F
TDD frame (M = 23 symbol T F F S TDD sync frame (M = 23 symbol T F S
Downstream M = 14 M = 8 Downstream M = 14 M = 8
us
ds
us
ds
Line 1 rmc d d d d Upstream rmc d d d d Upstream rmc ...
TTR = 5; TBUDGET = 5; TA = 0; TTR = 5; TBUDGET = 5; TA = 0;
ds
ds
ds
ds
ds
ds
[TIQ = 0, B' = 0, B = 0]; [TIQ = 0, B' = 0, B = 0];
Line 2 rmc d d d d d d Upstream rmc d d d d d d Upstream rmc ...
TTR = 5; TBUDGET = 7; TA = 0; TTR = 5; TBUDGET = 7; TA = 0;
ds
ds
ds
ds
ds
ds
[TIQ = 0, B' = 2, B = 2]; [TIQ = 0, B' = 2, B = 2];
Line 3 rmc d d d d d d d Upstream rmc d d d d d d q Upstream rmc ...
TTR = 5; TBUDGET = 8; TA = 2; TTR = 5; TBUDGET = 8; TA = 2;
ds
ds
ds
ds
ds
ds
[TIQ = 0, B' = 3, B = 3]; [TIQ = 0, B' = 3, B = 2];
Line 4 d d d d rmc d d d d Upstream d d d rmc d d d d Upstream d d d d rmc ...
TTR = 5; TBUDGET = 8 or 9 ; TA = 5; TTR = 5; TBUDGET = 9; TA = 5;
ds
ds
ds
DRMC = 4 [TIQ = 0, B' = 3 or 4 , B = 3]; ds [TIQ = 0, B' = 4, B = 4]; ds ds
ds
t = 0 I = T F t = 2T F
NOI DOI NOI DOI
DS logical frame (T ) containing DS sync symbol DS logical frame without DS sync symbol
F
rmc rmc symbol d data symbol = q quiet symbol sync symbol
G.9701(14)_FVI.3a
TTR = duration of the normal operation interval TA = number of quiet symbols immediately after TTR
TBUDGET+TA–1 = index of the last symbol position in a logical frame eligible for carrying a data symbol
(a) Downstream
s;
TDD frame (M = 23 symbol s; T F = M × T seconds) TDD sync frame (M = 23 symbol T F = M × T seconds)
S
F
F
S
F
F
M = 14 Upstream M = 8 M = 14 Upstream M = 8 M = 14 M = 8
us
ds
ds
us
ds
us
Line 1 Downstream rmc d d d Downstream rmc d d d Downstream rmc d ...
TTR = 3; TBUDGET = 4; TA = 0; TTR = 3; TBUDGET = 4; TA = 0;
us
us
us
us
us
us
[B' = 1, B = 1]; [B' = 1, B = 1]
Line 2 Downstream rmc d d d Downstream rmc d d d Downstream rmc d ...
TTR = 3; TBUDGET = 4; TA = 1; TTR = 3; TBUDGET = 4; TA = 1;
us
us
us
us
us
us
[B' = 1, B = 1]; [B' = 1, B = 1]
Line 3 Downstream d rmc d d Downstream d rmc d d Downstream d rmc d ...
TTR = 3; TBUDGET = 4; TA = 3; TTR = 3; TBUDGET = 4; TA = 2;
us
us
us
us
us
us
[B' = 1, B = 1]; [B' = 1, B = 1]
Line 4 Downstream d rmc d d Downstream d rmc d d Downstream d d rmc d ...
TTR = 3; TBUDGET = 4; TA = 4; TTR = 3; TBUDGET = 5; TA = 3;
us
us
us
us
us
us
[B' = 1, B = 1]; [B' = 2, B = 2]
t = 0 DRMC = 3 t = T F DRMC = 3
us
us
NOI DOI NOI DOI
Upstream logical frame (T ) containing sync symbol Upstream logical frame (T ) without sync symbol
F F
rmc rmc symbol d data symbol = q quiet symbol sync symbol
G.9701(14)_FVI.3b
TTR = duration of the normal operation interval TA = number of quiet symbols immediately after TTR
TBUDGET+TA–1 = index of the last symbol position in a logical frame eligible for carrying a data symbol
(b) Upstream
Figure VI.3 – Example 2: Avoiding common symbol periods in DOI to
turn off crosstalk cancellation processing
Figure VI.4 shows the example of DOI operating with two distributed vector groups, each with size 2x2
cancellation matrices.
Figure VI.4(a) shows a downstream channel configuration with 2x2 crosstalk cancellation of lines 1 and 2 for
the first four symbols in the DOI and 2x2 crosstalk cancellation with lines 3 and 4 for the remainder of the
DOI. The TIQ value is set to 0 for all lines by the DRA/VCE, such that when a line does not have data
available for the eligible data slots in the DOI, the FTU-O may substitute a quiet symbol in that location. This
case is shown in line 3 for the logical frame that does not contain a sync symbol.
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