Page 1082 - 5G Basics - Core Network Aspects

2 Transport aspects

The next upstream logical frame in Figure VI.2(b) is configured for a 2x2 vector matrix with lines 3 and 4 in
the DOI. This logical frame does not contain a sync symbol. Lines 1 and 2 are only transmitting in the NOI.
Lines 1 and 2 are configured with TBUDGET=TTR=4 and TA=0. Lines 3 and 4 are both configured with
TBUDGET=8 and TA=0 and the DRA/VCE has assigned TIQ=0 indicating that if there is no data available for
the slots in the DOI, a quiet symbol may be sent.

TDD frame (M = 23 symbol s; T F = M × T seconds) TDD sync frame (M = 23symbol s; T F = M × T seconds)
S
S
F
F
F
F
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 = 1, B' = B = 0]; [TIQ = 1, B' = B = 0];
Line 2 idle rmc d d d d d d d d idle Upstream idle rmc d d d d d d d d idle Upstream idle rmc ...
TTR = 5; TBUDGET = 11; TA = 0; TTR = 5; TBUDGET = 11; TA = 0;
ds
ds
ds
ds
ds
ds
[TIQ = 1, B' = 6, B = 4]; [TIQ = 1, B' = 6, B = 4];
Line 3 d rmc d d d d d d d d d Upstream d rmc d d d d d d d d d Upstream d rmc ...
TTR = 5; TBUDGET = 11; TA = 0; TTR = 5; TBUDGET = 11; TA = 0;
ds
ds
ds
ds
ds
ds
[TIQ = 1, B' = 6, B = 6]; [TIQ = 1, B' = 6, B = 6];
Line 4 d d d d rmc d d d d d d d d d Upstream d d d rmc d d d d d d d d d Upstream d d d d rmc ...
TTR =5; TBUDGET = 13 or 14 ; TA = 0; TTR = 5; TBUDGET = 14; TA = 0;
ds
ds
ds
DRMC = 4 [TIQ = 1, B' =8 or 9 , B = 8]; ds [TIQ = 1, B' = 9, B = 9]; ds ds
ds
t = 0 t = 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 idle idle symbol sync symbol
G.9701(14)_FVI.2a
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 sync frame (M = 23symbol s; T F = M × T seconds) TDD sync frame (M = 23 symbol T F = M × T seconds)
F
S
F
F
S
F
M = 14 Upstream M = 8 M = 14 Upstream M = 8 M = 14 M = 8
us
ds
us
ds
ds
us
Line 1 Downstream rmc d d d Downstream rmc d d d Downstream rmc d ...
TTR =4; TBUDGET = 4; TA = 0; TTR = 4; TBUDGET = 4; TA = 0;
us
us
us
us
us
us
[B' = B = 0]; [B' = B = 0];
Line 2 Downstream rmc d d d d Downstream idle idle rmc d d d Downstream rmc d ...
TTR = 4; TBUDGET = 8; TA = 0; TTR = 4; TBUDGET = 4; TA = 0;
us
us
us
us
us
us
[B' = 4, B = 1]; [B' = B = 0];
Line 3 Downstream d rmc d d d d Downstream d idle rmc d d d d Downstream d q q rmc d ...
TTR = 4; TBUDGET = 8; TA = 0; TTR = 4; TBUDGET = 8; TA = 0;
us
us
us
us
us
us
[B' = 4, B = 2]; [B' = 4, B = 2];
Line 4 Downstream d rmc d d d d Downstream d d rmc d d d d Downstream d d d rmc d ...
TTR = 4; TBUDGET = 8; TA = 0; TTR = 4; TBUDGET = 8; TA = 0;
us
us
us
us
us
us
[B' = 4, B = 3]; [B' = 4, B = 4];
t = 0 DRMC = 3 t = T F
us
Upstream NOI Upstream DOI Upstream NOI Upstream 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 idle idle symbol sync symbol
G.9701(14)_FVI.2b
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.2 – Example 1: Reduction of vector matrix size in the DOI
If the traffic patterns allow, it is possible that the vector processing may be turned off in the DOI if the data
symbols are distributed across the available symbol periods so as to avoid any common slots with the other
lines in the vector group. An example is given in Figure VI.3.
Figure VI.3(a) shows a downstream example where no symbols from different lines in the vector group
occupy the same symbol intervals in the DOI. In all cases, the DRA/VCE would likely set TIQ=0 forcing a
quiet symbol to be sent in a data eligible symbol position in the DOI. An example is shown for line 3 in the
logical frame that is without the sync symbol.
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