1. Handover scenarios and relevant media paths in MMCF
Haihua Li, CATR,
14th CJK NGN WG Meeting
December 10-12, 2008
Tokyo,Japan

2. Content of presentation
Brief introduction of EPS&MMCF and their mapping
Handover scenarios and relevant media paths of MMCF
Some consideration to MMCF in ITU-T
Li Haihua,CATR
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2018/7/4

3. EPS architecture & MMCF architecture
Architecture in Y.MMCF, ITU-T
Non-roaming architecture for 3GPP accesses(given in TS23.401)
Li Haihua,CATR
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2018/7/4

4. Mapping of EPS&MMCF
TUP-FE
RACF
MLM-FE(A)
HD-FE
HC-FE
NACF
RACF(A)
HC-FE(A)
HE-FE(A)
MLM-FE(C)
HC-FE(C)
HE-FE(C)
Bearer and control are not separated at S5 interface, MME、S-GW、PDN GW provide HC-FE
MME provides RACF for bearer connections from the Serving Gateway inwards. The PCRF provides RACF for packet flows from the Serving Gateway outwards
Li Haihua,CATR
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2018/7/4

5. Handover scenarios and relevant media paths of MMCF
1）Target: Based on the procedures given in and mapping between function entities given in two architectures, try to give some thinking about media paths and stir discussion of MMCF in more detail
2）In MMCF, Layer 2 handover & Layer 3 handover are included.
Difference：Layer 3 handover is required only when the UE moves to a new subnet
3）About anchor point
Signalling anchor point：C-MLMF，possible P-MLMF
Media anchor point：C-MMCF选择的L3HE-FE??
4) It’s important to assure the media continuity in the period of handover
Li Haihua,CATR
Page 5
2018/7/4

6. Figure 5.5.1.1.2-1: X2-based handover without Serving GW relocation –From 23.401
Point 1:Uplink data handover finished first
Point 2:Downlink data is transferred from source eNodeB to target eNodeB using x2 interface during handover
Li Haihua,CATR
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2018/7/4

7. Figure 5.5.1.1.2-1: X2-based handover without Serving GW relocation –From 23.401
MME
eNodeB
S-GW
PDN GW
Source
eNodeB
Target
Before Handover
During Handover
After Handover
Uplink data
Downlink data
Li Haihua,CATR
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2018/7/4

8. Layer 2 handover
MMCF
A-MMCF
C-MMCF
L2HC-FE
L3HC-FE
L3HC-FE
L2HE-FE
L3HE-FE
L3HE-FE
Source
L2HE-FE
L2HC-FE
Target
Uplink data
Downlink data
If Media path exists between L2HE-FEs,we can follow the mechanism which is similar to 3GPP EPS
Li Haihua,CATR
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2018/7/4

9. Layer 2 handover
MMCF
A-MMCF
C-MMCF
L2HC-FE
L3HC-FE
L3HC-FE
L2HE-FE
L3HE-FE
L3HE-FE
Source
L2HE-FE
L2HC-FE
Target
Uplink data
Downlink data
If Media path doesn’t exist between L2HE-FEs,we can use multi-connection mechanism or use buffer of L3HE-FE controlled by A-MMCF
Li Haihua,CATR
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2018/7/4

10. Layer 2 handover
MMCF
A-MMCF
C-MMCF
L2HC-FE
L3HC-FE
L3HC-FE
L2HE-FE
L3HE-FE
L3HE-FE
Source 1 2 3 4 5
L2HE-FE
L2HC-FE
Target
Uplink data
Downlink data
If Media path doesn’t exist between L2HE-FEs,we can use multi-connection mechanism or use buffer of L3HE-FE controlled by A-MMCF
Li Haihua,CATR
Page 10
2018/7/4

11. Figure 5.5.1.1.3-1: X2-based handover with Serving GW relocation –From 23.401
Point 1:Uplink data handover finished first
Point 2:Downlink data is transferred from source eNodeB to target eNodeB using x2 interface during handover
Li Haihua,CATR
Page 11
2018/7/4

12. Figure 5.5.1.1.2-1: X2-based handover without Serving GW relocation –From 23.401
MME
eNodeB
S-GW
PDN GW
Source
Source
eNodeB
S-GW
Target
Target
Before Handover
During Handover
After Handover
Uplink data
Downlink data
Li Haihua,CATR
Page 12
2018/7/4

13. Layer 3 handover
MMCF
C-MMCF
Source A-MMCF
L2HC-FE
L3HC-FE
L3HC-FE
L2HE-FE
L3HE-FE
L3HE-FE
Source
L2HE-FE
L3HE-FE
L2HC-FE
L3HC-FE
Target
Uplink data
Target A-MMCF
Downlink data
If Media path exists between L2HE-FEs,we can follow the mechanism which is similar to 3GPP EPS
Li Haihua,CATR
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2018/7/4

14. Layer 2 handover
MMCF
C-MMCF
Source A-MMCF
L2HC-FE
L3HC-FE
L3HC-FE
L2HE-FE
L3HE-FE
L3HE-FE
Source
L2HE-FE
L3HE-FE
L2HC-FE
L3HC-FE
Target
Uplink data
Target A-MMCF
Downlink data
If Media path doesn’t exist between L2HE-FEs,we can use multi-connection mechanism or use buffer of L3HE-FE controlled by A-MMCF
Li Haihua,CATR
Page 14
2018/7/4

15. Layer 2 handover
MMCF
C-MMCF
Source A-MMCF
L2HC-FE
L3HC-FE
L3HC-FE
L2HE-FE
L3HE-FE
L3HE-FE
Source 1 2 3 4 5
L2HE-FE
L3HE-FE
L2HC-FE
L3HC-FE
Target
Uplink data
Target A-MMCF
Downlink data
If Media path doesn’t exist between L2HE-FEs,we can use multi-connection mechanism or use buffer of L3HE-FE controlled by A-MMCF
Li Haihua,CATR
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2018/7/4

16. Some consideration to MMCF in ITU-T
How to assure media continuity during handover ?
Influence to Function entities/reference points/procedure in MMCF
Li Haihua,CATR
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2018/7/4

17. Thanks for your attention!