04-5G多连接网络架构及标准化进展
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Rel-12DualConnectivity– ControlPlane
z The S1‐MME is terminated in MeNB and the MeNB and the SeNB are interconnected via X2‐C
z MeNB take charge of the RRC state of
MME
RRC containers
UE, and transmit RRC signalling to UE. z The MeNB and the SeNB exchange information about UE configuration by means of RRC containers (inter‐node messages) carried in X2 messages.
MeNB
RRC signalling
SeNB
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Rel-12DualConnectivity– ControlPlane
¾ Mobility
z SeNB addition : MeNB initiated z SeNB release: MeNB or SeNB initiated z SeNB change: g MeNB or SeNB initiated z MeNB‐to‐(M)eNB handover, SeNB is released
Without inter‐MeNB handover involved
EVENT A3/A5 can be reused and h d enhanced 做世界级综合信息服务提供商
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Rel-12DualConnectivity– UserPlane
1A
3C
1A: S1‐U that 1A h terminates i i in SeNB S NB + independent i d d PDCP PDCPs (no ( bearer b split) li ) 3C: S1‐U that terminates in MeNB + bearer split in MeNB + independent RLCs for split p bearers
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Rel-12DualConnectivity– UserPlane
zSCG bearer (1A): S1‐U can terminate in the SeNB zSplit bearer (3C): the S1‐U only terminates in the MeNB and the user plane data is transferred from MeNB to SeNB using the X2‐U. zSplit bearer is assigned by MeNB the same DRB ID on MeNB and SeNB.
MCG bearer
Split bearer
SCG bearer
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DualConnectivitymobilityperformance
Events per UE per hour 2000 1500 1000 500 0 3 kmph 30 kmph 60 kmph 3 kmph 30 kmph 60 kmph 2 Picos 2 Picos 2 Picos 10 Picos 10 Picos 10 Picos PP HO PM HO MP HO MM HO
Events per UE per hour 2000 1500 500 1000 500 0 3 kmph 30 kmph 60 kmph 3 kmph 30 kmph 60 kmph 2 Picos 2 Picos 2 Picos 10 Picos 10 Picos 10 Picos SCell Change SCell Removal SCell Add PCell HO
Mobility Events for inter‐frequency handover
0.2 0.18 0.16 0 14 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 5 4.5 4 35 3.5 3 2.5 2 1.5 1 0.5 0
Events for DC
macro2pico i 2 pico2macro macro2macro pico2pico scell add scell remove pcell handover scell change
macro2pico pico2macro macro2macro pico2pico scell add scell remove pcell handover scell change
Mobility Events
Mobility failure rate <15>
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Rel– 13LTE-WLANAggregation
MME / S-GW S GW
S1
S1
Xw
WT
Xw
eNB
Xw
WLAN AP
Xw
WT
eNB
WLAN AP
• Both LTE‐WLAN colocated and un‐colocated scenarios are supported • WLAN Termination: logical node that terminates the Xw interface. WT can be WLAN AP or WLAN AC • Xw interface is similar to X2 interface in DC
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