8/9/2019 Should LTE Gateways (SGW and PDN-GW) Colocate and
Merge?
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Generated by Jive SBS on 2009-12-07-07:00
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Service Provider Mobility: Should LTEGateways (SGW and PDN-GW)
Colocate andMerge?
Posted byRitesh KumarNov 7, 2009
LTE Gateways - Serving Gateway (SGW) and Packet Data Network
Gateway (PDN-GW)
are used for LTE bearer path whereas Mobility Management Entity
(MME) is used for
siganling.
Lets look at hogh level functions for both the LTE gateways:
Serving GW: provides mobility anchor for inter eNodeB handover
and paging trigger for downlink traffic
awaits user. SGW is also used for 3GPP Inter-RAT traffic with S4
connectivity to SGSN. For PMIP based
version, it would provide bearer session management and
control.
PDN GW: provides connectivity from user to services. It provides
network-wide mobility anchor, including
for non-3GPP technologies. It provides bearer session management
and control.
With PMIP version almost on hold after Verizon made a decision
to use GTP, Serving
Gateway's role as a separate entity provides very little
function that PDN-GW does not
perform, essentially data path mobility management events
(paging trigger and eNodeB
handovers).
Does this justify a separate entity in the data path with high
throughput handling capabilites?
An additional cost for operators? An additional question - does
it need to colocate SGW?
Should SGW and PDN-GW be hierarchical in nature?
There are discussions on local offload at different hierarchical
levels. With a merged
gateway, the local offload feature is same as SGi, reducing one
more complexity. Reducinglatency on real-time applications
including VoIP will be an easier discussion.
Should 3GPP standard look at combining the two gateways? In my
view, it should.
What are your thoughts?
http://people/ribansal
8/9/2019 Should LTE Gateways (SGW and PDN-GW) Colocate and
Merge?
2/2
Service Provider Mobility: Should LTE Gateways (SGW and PDN-GW)
Colocate and Merge?
Generated by Jive SBS on 2009-12-07-07:00
2
195 Views Tags: distribution, lte, long_term_evolution,
pdn_gateway, colocate, merge, sgw, lte_gateways,
serving_gateway, pgw
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