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Content for TS 48.016 Word version: 18.0.0

1… 4… 7…

4 Network Service general description p. 10

4.1 Overview p. 10

4.2 Addressing p. 11

4.2.1 Network Service Virtual Link (NS-VL) p. 11

4.2.2 Network Service Virtual Connection (NS-VC) p. 12

4.2.3 Network Service Virtual Connection Group p. 13

4.2.4 BSSGP Virtual Connection (BVC) p. 13

4.2.5 Use of Concepts on the Gb Interface when Intra Domain Connection of RAN Nodes to Multiple CN Nodes applies in the BSS p. 14

4.3 Sub-Network Service functions p. 14

4.4 Load sharing function p. 15

4.4.1 Load Sharing function for the Frame Relay Sub-Network p. 15

4.4.1.1 Overview p. 15

4.4.1.2 Requirements on load sharing function p. 15

4.4.2 Load sharing function for the IP Sub-Network p. 15

4.4.2.1 Overview p. 15

4.4.2.2 Selection of the local IP endpoint p. 16

4.4.2.3 Selection of the remote IP endpoint p. 16

4.4.2.3.1 Selection of remote IP endpoint for data traffic p. 16

4.4.2.3.2 Selection of remote IP endpoint for signalling traffic p. 17

4.4a Resource distribution function p. 17

4.4a.1 Requirements on resource distribution function p. 17

4.5 NS-VC management function p. 18

4.5.1 Blocking / unblocking of an NS-VC p. 18

4.5.2 Reset of an NS-VC p. 18

4.5.3 Test of an NS-VC p. 19

5 Elements for layer-to-layer communication p. 19

5.1 Service primitive model p. 19

5.2 Service primitives and parameters p. 19

5.2.1 Primitives p. 20

5.2.1.1 NS-UNITDATA-Request p. 20

5.2.1.2 NS-UNITDATA-Indication p. 20

5.2.1.3 NS-CONGESTION-Indication p. 20

5.2.1.4 NS-STATUS-Indication p. 20

5.2.2 Parameters p. 20

5.2.2.1 NS SDU p. 20

5.2.2.2 Link Selector Parameter p. 21

5.2.2.3 BVCI I and NSEI p. 21

5.2.2.4 Congestion cause p. 21

5.2.2.5 Transfer capability p. 21

5.2.2.6 NS affecting cause p. 21

5.2.2.7 NS change IP endpoint p. 21

6 Sub-Network Service protocol p. 22

6.1 Frame Relay support of the Sub-Network Service protocol p. 22

6.1.1 Overview p. 22

6.1.2 Network configuration p. 22

6.1.3 Services expected from layer 1 p. 23

6.1.4 Options selected from FRF 1.1 p. 23

6.1.4.1 Support of DL-CONTROL sub-layer p. 23

6.1.4.2 Frame length p. 23

6.1.4.3 Congestion control procedures p. 23

6.1.4.3.1 DE bit usage p. 23

6.1.4.3.2 FECN and BECN bit usage p. 23

6.1.4.4 Signalling procedures p. 24

6.1.4.5 C/R bit usage p. 24

6.1.5 Abnormal conditions p. 24

6.2 IP Support of the Sub-Network Service Protocol p. 24

6.2.1 Overview p. 24

6.2.1a Abnormal Conditions p. 25

6.2.2 IP Fragmentation p. 25

6.2.3 Services expected from layer 1 and layer 2 p. 25

6.2.4 Size Procedure p. 25

6.2.4.1 Abnormal Conditions p. 26

6.2.5 Configuration Procedure p. 26

6.2.5.1 Abnormal Conditions p. 27

6.2.6 Add Procedure p. 28

6.2.6.1 Abnormal Conditions p. 28

6.2.7 Delete Procedure p. 29

6.2.7.1 Abnormal Conditions p. 29

6.2.8 ChangeWeight Procedure p. 29

6.2.8.1 Abnormal Conditions p. 30