The document outlines various procedures and reference implementations for handovers in WCDMA networks, including soft and hard handovers within and between RNCs, as well as service-based intersystem handovers from UTRAN to GSM. It lists multiple references for protocols and technical specifications related to radio link management and synchronization. The information is structured in a list format covering different handover scenarios and related actions.

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WCDMAWCDMAWCDMAWCDMA HOHOHOHO CallCallCallCall FlowsFlowsFlowsFlows
By Justin MA Created: June 2014 Updated: 2014_0801
Change History:
2014_0801: Modify the SRNS Relocation Picture notation in NSN.

2. 2222/25/25/25/25

3. 3333/25/25/25/25
Soft HO after E1A (Intra-RNC)
Ref: Huawei

4. 4444/25/25/25/25
Soft HO after E1B (Intra-RNC)
Ref: Huawei

5. 5555/25/25/25/25
Hard HO in Intra-RNC
moving
Ref: Huawei

6. 6666/25/25/25/25
Soft HO in Inter-RNC
moving
Ref: Huawei
DRNC DRNC

7. 7777/25/25/25/25
Soft HO in Inter-RNC
Radio Link Addition (Branch Addition)
Iur

8. 8888/25/25/25/25
UE Node B
Drift RNS
Drift
RNC
Serving
RNC
DCH -FPDCH -FP
8. Downlink Synchronisation
RNSAP RNSAP
1. Radio Li nk Setup
Request
Start TX
description
NBAP NBAP
2. Radio Link Setup
Request
RNSAP RN SAP
4. Radio Link Setup
Response
NBAP NBAP
3. Radio Link Setup
Response
Start RX
description
Decision to setup
new RL
RRCRRC
11. DCCH : Active Set Update Complete
RRCRRC
10. DCCH : Active Set Update
[Radio Link Addition]
ALCAP Iur Bearer Setup5. ALCAP Iub Bearer Setup
DCH -FPDCH -FP
9. Uplink Synchronisation
RNSAP RNSAP
7. Radio Link Restore
Indication
NBAP NBAP
6. Radio Link Restore
Indication
Ref: TR 25.931
Iur

9. 9999/25/25/25/25
Soft HO in Inter-RNC
Radio Link Deletion (Branch Deletion)
Iur

10. 10101010/25/25/25/25
UE Node B
Drift RNS
Drift
RNC
Serving
RNC
RRCRRC
2. DCCH : Active Set Update Complete
Decision to delete
old RL
RNSAP RNSAP
3. Radio Link Deletion
Request
NBAP NBAP
4. Radio Link Deletion
Request
RNSAP RNSAP
6. Radio Link Deletion
Response
NBAP NBAP
5. Radio Link Deletion
Response
Stop RX and TX
RRCRRC
1. DCCH : Active Set Update
[Radio Link Deletion]
ALCAP Iur Bearer Release7. ALCAP Iub Bearer Release
Ref: TR 25.931
Iur

11. 11111111/25/25/25/25
Soft HO in Inter-RNC
Radio Link Replacing
Ref: TR 25.931
Iur

12. 12121212/25/25/25/25
Hard HO in Inter-RNC
Ref: Huawei
IurIurIurIur

13. 13131313/25/25/25/25
Ref: Huawei

14. 14141414/25/25/25/25
SRNS Relocation for CS (UE-not-involved)
Ref: NSN
Iur

15. 15151515/25/25/25/25
SRNS Relocation for CS (UE-involved)
Ref: NSN
Iur

16. 16161616/25/25/25/25
SRNS Relocation for PS (UE-not-involved)
Ref: NSN
Iur

17. 17171717/25/25/25/25
SRNS Relocation for PS (UE-involved)
Ref: NSN
Iur

18. 18181818/25/25/25/25
Inter-Frequency Hard Handover
RNSAPRNSAP
1. Radio Link
Setup Request
Note 1Note 1Note 1Note 1
UE Node B
Source
Node B
Target
RNC
Source
RNC
target
SRNC
RRC RRC
12. DCCH : Physical Channel Reconfiguration Complete
Note 3Note 3Note 3Note 3
RRC
7. DCCH : Physical Channel Reconfiguration
Note 3Note 3Note 3Note 3
RRC
6. ALCAP Iur Data
Transport Bearer Setup
Note 1Note 1Note 1Note 1
NBAP NBAP
2. Radio Link Setup Request
NBAP NBAP3. Radio Link Setup Response
NBAP NBAP
14. Radio Link Deletion Request
NBAP NBAP
15. Radio Link Deletion Response
4. ALCAP Iub Data Transport Bearer Setup
16. ALCAP Iub Data Transport Bearer Release
RNSAP RNSAP17. Radio Link Deletion Response
Note 2Note 2Note 2Note 2
18. ALCAP Iur Data
Transport Bearer Release
Note 2Note 2Note 2Note 2
RNSAP
5. RL Setup
Response
Note 1Note 1Note 1Note 1
RNSAP
RNSAP13. Radio Link Deletion Request
Note 2Note 2Note 2Note 2
RNSAP
NBAP NBAP
8. Radio Link Failure Indication
RNSAP RNSAP9. Radio Link Failure Indication
Note 2Note 2Note 2Note 2
NBAP NBAP10. Radio Link Restore Indication
RNSAP
11. RL Restore
Indication
Note 1Note 1Note 1Note 1
RNSAP
Ref: TR 25.931
Iur

19. 19191919/25/25/25/25
Service based UTRAN to GSM/BSS Intersystem Handover
UE RNC 3G MSC 2G MSC BSC
6. Relocation Required
RANAP
7. Prepare Handover
MAP/E
8. Handover Request
BSSMAP
9. Handover request Ack
BSSMAP
10. Prepare Handover Response
MAP/E
11. Relocation Command
RANAP
12. Handover from UTRAN Command
RRC
13. Handover Detect
BSSMAP
14. Handover Complete
RR
15. Handover Complete
BSSMAP
16. Send End Signal Request
MAP/E
17. Iu Release Command
RANAP
18. Iu Release Complete
RANAP
19. Send End Signal Response
MAP/E
1. RAB Assignment Request
[Service Handover]RANAP
4. RAB Assignment Response
RANAP
2. RB setup
RRC
3. RB response
RRC
5. RNC decides
to make
handover
Radio link failure on UTRAN and radio link establishment in GSM/BSS
RANAP
RANAP
RANAP
RANAP
RANAP
RANAP
RRC
RRC
RRC
MAP/E
MAP/E
MAP/E
MAP/E
BSSMAP
BSSMAP
BSSMAP
BSSMAP
RR
Ref: TR 25.931

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iRAT-CS-HO WCDMA to GSM
Ref: Huawei

21. 21212121/25/25/25/25
Ref: Ericsson

22. 22222222/25/25/25/25
3G to 2.5G Cell Change Order
Ref: Tekcomms

23. 23232323/25/25/25/25
Ref: Ericsson

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Intra-RNC-Inter-NodeB-Inter-Frequency Hard HO
f1

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Ref: