A guess about the type of new wireless network that Crown Castle plans to build in Rye NY
Neutral-host distributed antenna systems (DAS)

New network use LTE, a wireless technology that is changing Wireless infrastructure investments

Carriers (Verizon, ATT, T-Mobile, Sprint) want Crown Castle to own and maintain the network.  carriers will “share” use the same wireless network infrastructure.  Wireless service providers do not own their own towers. American Tower and Crown Castle own the towers and rent space to the carriers.

LTE and Fiber up the tower mean there is no need for separate antenna systems on towers for each carrier. Fiber to a remote radio head.

There is no need for separate antenna indoors,  indoor-coverage  will be implemented on neutral-host distributed antenna systems (DAS) shared outdoor infrastructure will become the standard in the U.S.. This is based on the success seen with that model in the United Kingdom.

There are very beneficial sharing arrangements driven by public safety especially for indoor coverage,

Carriers do not care if their customers use their networks “exclusively” that’s not how carrier bill customer and how they make money

Public-safety cited this argument as a reason carriers might not support the development of standards for peer-to-peer communications. P2P “mesh network ” is a standard in Local mobile Radio.
LTE P2P “peer to peer” voice for first responders is critical. Cops and fireman need instant, reliable, voice communication

Consumers use more data

There is a seemingly insatiable appetite for more mobile bandwidth. Carriers try to offload data traffic from their networks. Carriers can’t build new networks fast enough to keep up with consumers’ demands. Existing WiFi networks including home Wifi connections are already used for off loading .

Integration of LTE and Wi-Fi should be part of new Rye network?

A single “device” should work for all bands and all protocols:  Multi-band devices at one time were considered engineering marvels. Today’s smartphones support an amazing number of bands, multiple generations of cellular technologies.

LTE is great for data, but not voice: The title of this page VOLTE which is Voice over LTE

LTE has transformed the way people consume data, but voice over LTE was not part of the standard. consumer-grade high-definition (HD) voice over LTE rolled out by carriers has GREAT audio quality. Fewer dropped calls.

There is a technical standard for mission-critical voice over LTE, VOLTE. This is VERY important for Rye first responders.
Ask Rye cops and fireman about dead spots and having to carry multiple devices,

Audio quality must be maintained when devices operate in peer-to-peer mode. Think push to talk and a “walkie talkie” and remember a mesh network is not a new idea, German Tanks in WWII used a VHF Mesh network.

Tech stuff on VOLTE most Rye folks will not read this – it’s here for background

IMS was implemented to be acceptable to operators.  A smaller cut down version was used that reduced the number of entities required in the IMS network, but also simplified the inter connectivity – focusing on the elements required for VoLTE.


Diagram showing the basic IMS network used for carrying Voice over LTE, VoLTE.
Reduced IMS network for VoLTE

Reduced IMS network for VoLTE:

  • IP-CAN IP, Connectivity Access Network:   This consists of the EUTRAN and the MME.
  • P-CSCF, Proxy Call State Control Function:   The P-CSCF is the user to network proxy. In this respect all SIP signalling to and from the user runs via the P-CSCF whether in the home or a visited network.
  • I-CSCF, Interrogating Call State Control Function:   The I-CSCF is used for forwarding an initial SIP request to the S-CSCF. When the initiator does not know which S-CSCF should receive the request.
  • S-CSCF, Serving Call State Control Function:   The S-CSCF undertakes a variety of actions within the overall system, and it has a number of interfaces to enable it to communicate with other entities within the overall system.
  • AS, Application Server:   It is the application server that handles the voice as an application.
  • HSS, Home Subscriber Server:   The IMS HSS or home subscriber server is the main subscriber database used within IMS. The IMS HSS provides details of the subscribers to the other entities within the IMS network, enabling users to be granted access or not dependent upon their status.

The IMS calls for VoLTE are processed by the subscriber’s S-CSCF in the home network. The connection to the S-CSCF is via the P-CSCF. Dependent upon the network in use and overall location within a network, the P-CSCF will vary. This is a key element to allow voice calling capability.

A requirement for VoLTE enabled networks is to have a method to hand back a voice call to circuit switched legacy network.   LTE mobile phones only have one transmitting radio in the handset to preserve battery life.  A system known as SRVCC – Single Radio Voice Call Continuity is required for this.

Also support for dual tone multi-frequency, DTMF signalling is mandatory.  This is used for for signalling over POTS – analog telephone lines.