handover
DESCRIPTION
HANDOVER RFTRANSCRIPT
PROSES HANDOVER PADAUNIVERSAL MOBILE TELECOMMUNICATIONS SYSTEM (UMTS)
Disajikan oleh :Uke Kurniawan UsmanEmail : [email protected] pada acara seminar :ECCIS 2004, 25-26 Mei 2004,di UNIBRAW,Malang
Handover
Terbagi dalam dua bagian :1. Internal Handover : Handover yang
hanya melibatkan satu BSC dalam satu MSC.
Contoh : Kanal (time slot) pada sel yang sama, Sel (BTS) pada BSC yang sama
2. Eksternal Handover : Handover yang melibatkan MSC.
Contoh : Sel pada BSC yang berbeda tetapi dalam MSC yang sama, dan sel pada MSC yang berbeda
Hard Handover
Gambar 3.2 Hard Handover
Node B Node B
Soft Handover dan Softer Handover
Gambar 3.5 Soft Handover dan Softer Handover
RNC
Node B 2
Node B 1
Iub(ATM)
Iub(ATM)
UE
Node B
RNC
UE
Sector 1
Sector 2
The same signal is sentfrom both sectors to UE
The same signal is sent from both Node Bs toUE, except for the power control commands
Macro diversity combining in uplink
Arsitek Jaringan UMTS
BTS
BTS
BSC
RNC
VLR
NODE B
NODE B
NODE B
RNC
MSC GMSC
GGSNSGSN
VLR
OMC
UE(USIM)
TC
PDNe.g. internet,intranet, X-25
PSTN
ISDN
AuC
HLR
A
Gb
Iu CS
Iu PS Gn Gi
Iu
ExternalNetwork
GSM BSSTRAU
Abis
Iub
Iub
USIM & SIM forGSM, UMTS &
UMTS/GSMTerminals
Iur
GSM Phase 2+ Core Network
Um
UuUTRAN
Gambar 2.4 Arsitektur Jaringan UMTS
Struktur Interface Protokol UMTS
Layer 1 - Physical
Layer 2 - Medium Access Control (MAC)
Layer 2 - Radio Link Control (RLC)
Layer 2 -Broadcast /Multicast
Control (BMC)
Layer 2 - PacketData ProtocolConvergence
(PDCP)
Layer 3 -Radio ResourceControl (RRC)
Control Plane User Plane
U-Plane Radio Bearers
Logical Channels
Transport Channels
Control
Control
Control
Control
Control
Gambar 2.8 Struktur Protokol Antar Muka Udara UMTS
Signallingradio bearers
Radio Network Controller ( RNC )
Gambar 2.7 Kegunaan RNC
RNC
RNC
D-RNC * Orty RRAllocation
S-RNC : * Combining/ Splicing * Active Set * RR Allocation
Core Network CN
RNC Function :* Autonomous RRM* ATM Switching & Multiplexing* Control Over RNS* O&M Interface
UuUu
Uu
Iub
Iu
Iur
Iub
Iub
Iu
UTRAN : TS 25.401
Node B
Gambar 2.7 Gambaran Node BRNC
Node B
Uu
Iub
Physical Node* Connected via Uu/Iub* Support of 1/several cells* FDD and/or TDD Modeoperation* ATM Termination (Iub)* Data conversion for Uutransmision* Inner Loop PC* Measurement reports* FDD : Micro Diversity(Softer HO)
Algoritma Soft Handover W-CDMA
MeasurementQuality
Connected to cell 1
Reporting_range -Hysteresis_event 1A Hysteresis_
event 1C
Reporting_range +Hysteresis_event 1B
Event 1A =Add Cell 2
Event 1C =Replace Cell 1
with Cell 3
Event 1B C =Remove Cell 3
Time
Gambar 3.9 Skema umum algoritma soft handover pada WCDMA
T T T
Pilot Ec/Io ofcell 1
Pilot Ec/Io ofcell 2
Pilot Ec/Io ofcell 3
Skenario Soft Handover W-CDMA
1
Cell 1Connected
Add Cell 2
Replace Cell 1with Cell 3
2
RemoveCell 3
3
Gambar 3.8 Skenario Soft handover pada W-CDMA
Prosedur Handover Inter-3G_MSC UMTS ke GSM
I u-RELOCATION-
REQUIRED MAP- Prep- HOreq. MAP- Allocate- HON req.
A- HO- REQUEST
A- HO- REQUEST- ACK
MAP- Send- HO- Report- req.MAP- Prep- HO- resp.
IAM
MAP- Send- HO- Report resp.(1)ACMIu- RELOC- COMMAND
A- HO- DETECTMAP- Process-
Access- Signal req.
A- HO-COMPLETE
MAP- Send- End-Signal req.Iu- REL- CMD/COM
ANSWER
RELEASEEnd of call
MAP- Send- End-Signal resp.
Gambar 4.5 Prosedur Handover Inter-3G_MSC UMTS ke GSM
3G_MSC-A BSS-B/MSMSC-B
VLR-BRNS-B/UE
Prosedur Handover Inter-3G_MSC GSM ke UMTS
MAP- Prep- HO- req.
Iu- RELOC- REQUEST
Iu- RELOCATION-DETECT
A- HO- COMMAND
ANSWER
Gambar 4.6 Prosedur Handover Inter-3G_MSC GSM ke UMTS
RNS-B/UEVLR-B
MSC-A 3G_MSC-B
MAP- Allocate- HON req.A- HO- REQUIRED
MAP- Prep- HO- resp.
A- CLR- CMD/COM
MAP- Process-Access- Sig.req.
I u- RELOC- REQ- ACK
MAP- Send- HO- Report req.
IAM
ACM
MAP- Send- End-Sig.req.
RELEASE
I u- RELOCATION-COMPLETE
MAP- Send- End-Sig.resp.
MAP- Send- HO- Report resp.
End of call
BSS-A/MS
Prosedur Basic Relocation SRNS 3G_MSC-A ke 3G_MSC-B
RNS-A RNS-B3G_MSC-A 3G_MSC-B
VLR-B
IU- RELOC-REQUIRED
MAP- Prep- HO req. MAP- Allocate- HON req.
I U- RELOC- REQUEST
IU- RELOC-REQUEST- ACK
MAP- Send- HO- Report- req.MAP- Prep- HO- resp.
IAM
MAP- Send- HO- Report resp.ACM
I U- RELOC-COMMAND
I U- RELOC- DETECTMAP- Process-
Access- Sig req.
I U- RELOC-COMPLETE
MAP- Send- End-Signal req.
IU- REL- CMD/COM
ANSWER
RELEASEEnd of call
MAP- Send- End-Signal resp.
Gambar 4.7 Prosedur Basic Relocation SRNS3G_MSC-A ke 3G_MSC-B
Prosedur Handover Intra-3G_MSC UMTS ke GSM
I u- Relocation-Required
A- HO- Request
A- HO- Request- AckI u- Relocation-Command
RRC- HO- Command
A- HO- DetectRI - HO- Complete
I u- Release-Complete
Gambar 4.1 Prosedur Handover Intra-3G_MSC UMTS ke GSM
3G_MSC-A
UE/MS
RNS-A
UE/MS
BSS-B
RI - HO- Access
A- HO- CompleteIu- Release-
Command
A- HO- Required Iu- Relocation-Request
Iu- Relocation-Request- Ack
A- Ho- CommandRI - HO- Command Iu- Relocation-
Detect RRC- HO-Complete
A- Clear- Complete
Gambar 4.2 Prosedur Handover Intra-3G_MSC GSM ke UMTS
3G_MSC-A
UE/MS
RNS-B
UE
BSS-A
I u- Relocation-Complete
A- Clear- Command
Prosedur Handover Intra-3G_MSC GSM ke UMTS
Inter-system Handover
GSM Base Station3G_MSC
UMTS Node BUE
1
23
45
61. Measurement control2. Measurement report3. Resource reservation4. Resource reservation ACK + handover command5. Handover from UTRAN to GSM6. Handover access
Gambar 3.3 Prosedur Handover Inter-system UTRAN ke GSM
BSCRNC
Penutup(1/2)
1.Proses Handover diawali dengan :UE/MS melakukan pengukuran Kualitas Ec/Io kanal Pilot (CPICH),Tahap Filtering,Tahap Timing Information,RNC mengirimkan info DCH timing adjustment ke target cell untuk sinkronisasi antara Base Station baru dengan UE/MS.
Penutup(2/2)
2.Pada Handover Intra 3G_MSC UMTS terdapat 2 interface A dan Iu, dengan satu pengendali signaling handover yaitu 3G_MSC.
3.Pada Handover Inter 3G_MSC,terdapat 2 pengendali signaling handover yaitu 3G_MSC dan MSC.Interface Iu pada 3G-MSC dan Interface A pada MSC.
Sekian dan Terima KasihUke Kurniawan [email protected]