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Transport aspects 2

Annex Y

Upstream dynamic resource reports
(This annex forms an integral part of this Recommendation.)

(This annex forms an integral part of this Recommendation.)An upstream dynamic resource report (DRRus)
shall represent the total amount of data in each of the QoS queues located in the NT in terms of reporting
blocks. The size of reporting blocks shall be configured and updated via a DRR configuration request eoc
command (see Table 11-49 and the DRRdata for DRR configuration request field of Table Y.2).
The number of QoS queues supported by the NT shall be represented by NQ, with 1 ≤ NQ ≤ 4. Queues shall
be numbered starting from 0 up to NQ-1. A higher queue number shall indicate a higher priority level. An
eoc response message shall indicate the value NQ. The FTU-R reports the value of NQ as part of the DRR
configuration data at initialization (R-MSG1) and during showtime in the reply to the eoc DRR configuration
command (Table 11-50), field "DRRdata for DRR configuration confirm" defined in Table Y.2. The value NQ
is implementation dependent but shall not change until the next initialization.

The resource metric shall consist of NQ bytes, a single byte per queue, transmitted in the order of
ascending queue number. Each byte shall represent the queue fill. The queue fill for queue number 0 shall
be transmitted first.
The queue fill, expressed in reporting blocks, shall be obtained by rounding up the corresponding value in
bytes. If k packets with lengths Li bytes (i = 1,…,k) are stored in the queue, the queue fill, R, shall be
calculated as follows.
 1 k 

L
R  ceiling   i
 B 
  i 1 
where B is the reporting block size in bytes.

For DRRus, the queue fill value R shall be encoded into a fixed-size single byte field. This non-linear
encoding shall be as specified in Table Y.1.

Table Y.1 – Encoding of queue fill in blocks

Encoding in upstream
Queue fill, R, in blocks Binary input (FTU-R) Binary output (FTU-O)
RMC message
0 – 127 00000000abcdefg 0abcdefg 00000000abcdefg

128 – 255 00000001abcdefx 10abcdef 00000001abcdef1
256 – 511 0000001abcdexxx 110abcde 0000001abcde111
512 – 1023 000001abcdxxxxx 1110abcd 000001abcd11111
1 024 – 2 047 00001abcxxxxxxx 11110abc 00001abc1111111
2 048 – 4 095 0001abxxxxxxxxx 111110ab 0001ab111111111
4 096 – 8 191 001axxxxxxxxxxx 1111110a 001a11111111111
8 191 – 16 383 01xxxxxxxxxxxxx 11111110 011111111111111
>16 383 1xxxxxxxxxxxxxx 11111111 111111111111111

The format of the DRRdata field in the DRR configuration request for the FTU-O (Table 11-49) and the DRR
configuration confirm for the FTU-R (Table 11-50) shall be as defined in Table Y.2.

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