LOW DENSITY AREA
In locations where the number of smartphone users is not an issue,
bandwidth savings in the backbone network can be made by deploying a
standard content delivery network (CDN).
A mobile network can be divided into two main subnetworks:
the backbone, which starts with the headend and is universal to
all types of delivery, wired or wireless; and
backhaul, which contains the equipment specific to the mobile network,
from the PDN gateway down to the base stations.
points of presence where local caches are located when serving
low-density areas can be mapped with the PDN gateways. This optimizes
the backbone by reducing the traffic in the core network. Content that
is most requested in the backhaul fed by a specific PDN gateway can be
cached at this entry point as it becomes popular, in a way that is very
similar to a standard CDN scenario for IPTV or cable networks.
HIGH DENSITY AREA
Small cell technology can help operators deal with the increasing
traffic and bandwidth limitations of the radio spectrum in the access
network. But even with many small cells deployed over the country, the
traffic still has to be managed by the Evolved Packet Core (EPC) – the
The EPC also has its own bandwidth limitations, and it
becomes difficult for operators to guarantee a good quality of
experience to subscribers.
is where a CDN can help with handling network limitations. Under this
approach, popular content should be streamed to end-users from a
location as close as possible to them. Operators can get closer by using
the base station (eNodeB) as a component of the CDN capable of hosting
some processing mechanisms as well as caching capacity.
traffic offload or local breakout reroutes the U-plane directly to a
local gateway, or more generally to the Internet. The C-plane can still
be connected using a standard 3GPP interface to the EPC.
The benefits for end-users and operators are clear:
• Quality (i.e., short startup time, ABR video quality) is improved due a short RTT (round trip time).
The load on the network is decreased, and operators don’t need to
invest in new mobile equipment to handle excessive traffic. Staying
with a standard network, operators will need to invest rapidly,
according to recent research on mobile consumption, to handle all the
have already deployed many base stations, and local breakout can
leverage this equipment to host software, allowing the mechanism to be
very close to end-users.
VERY HIGH DENSITY AREA
In a very crowded area, small cells can again be used to increase the
capabilities of a network; however, this solution has limits. For
example, in a stadium environment where people can follow live actions
on their personal device, operators have to deal with thousands of
simultaneous users in a zone covered by a limited number of eNodeBs.
many people are watching the same content, the best optimization
consists of using a broadcast technology. LTE eMBMS (evolved multimedia
broadcast/multicast service) is also called LTE broadcast, and for good
reason. When using LTE broadcast, the bandwidth is shared between all of
the users watching the same content in a given area.
The eMBMS technology that is part of LTE standards can make live TV a reality for mobile operators.
LTE networks have paved the way toward new video content consumption
models that are not just limited to single mobile devices. The
development of LTE home gateways now allows users to watch videos on
their TV screens, switching to broadband ADSL or cable networks in zones
where fixed lines have not yet been deployed.
As a result, mobile
operators have a real opportunity to generate huge savings as well as
new revenues optimizing their network for video. At Broadpeak, we have
numerous ways of helping them achieve this goal.
You can download the “CDN technologies for use in mobile networks” white paper here to find out what they are.