Bluetooth core specs and telephony

https://qualweb.bluetooth.org/Building/HowTechnologyWorks/CoreSpecifications.htm

More than just Replacing Cables

Bluetooth wireless technology is a wireless communications system intended to replace the cables connecting portable and/or fixed electronic devices.Bluetooth Core Specification v4.0 with Hallmark Feature Bluetooth low energy technologyBluetooth Core Specification v3.0 + HSBluetooth Core Specification v2.1 + EDR 

Bluetooth Core Specification v4.0 with Hallmark Feature Bluetooth low energy technology

In July, 2010, the Bluetooth SIG announced the formal adoption of Bluetooth Core Specification Version 4.0 with the hallmark feature, Bluetooth low energy technology. This final step in the adoption process opened the Bluetooth SIG Qualification Program for qualification of all Bluetooth product types to Version 4.0.Thanks to its innovative design, Bluetooth low energy wireless technology consumes only a fraction of the power of Classic Bluetooth radios. This design enables the technology to be used in devices powered by small, coin-cell batteries and, in some cases, makes it possible to operate these devices for more than a year without recharging.Bluetooth low energy wireless technology, the hallmark feature of the Bluetooth Core Specification Version 4.0, features:Ultra-low peak, average and idle mode power consumptionAbility to run for years on standard coin-cell batteriesLow costMulti-vendor interoperabilityEnhanced rangeBluetooth low energy wireless technology allows devices such as watches and toys to be enhanced with Bluetooth wireless technology and will also provide the ability for new functionalities to be incorporated in to types of devices that can already be enabled by Bluetooth technology such as sports & fitness, health care, human interface (HIDs) and entertainment devices. For example, sensors like those in pedometers and glucose monitors will run only low energy technology.These single-mode devices will benefit from the power savings provided by v4.0 as well as a low cost of implementation. Watches will take advantage of both low energy technology while collecting data from fitness sensors on the body as well as Classic Bluetooth technology when sending that information to a PC, or separately displaying caller ID information when wirelessly connected to a mobile phone. Mobile phones and PCs, which support the widest range of use cases for this new version of the Specification, utilizing the full dual-mode package with Classic, low energy and high speed versions of the technology running side by side.To the top 

Bluetooth Core Specification v3.0 + HS

In April 2009, The Bluetooth SIG announced the release of Bluetooth high speed technology. The Bluetooth Core Specification Version 3.0 + HS enables the use of a Generic Alternate MAC/PHY, allowing the well known Bluetooth protocols, profiles, security, and pairing to be used in consumer devices while achieving faster throughput with momentary use of a secondary radio already present in the device.By isolating the activity from the AMPs, v3.0 enables the use of new radios without full system integration, reducing costs while expanding future build opportunities. This also removes the user from new paradigms, proving existing Bluetooth use cases, only faster and ensuring continuity for the UX experience, lowering costs and reducing training requirements.The v3.0 + HS enhancement to the Core Specification will provide consumers with powerful, wireless connections that are more robust that ever before.Power Optimization - By using the high speed radio only when you need it, Bluetoothhigh speed technology reduces power consumption, which means a longer battery life for your devices.Improved Security - The Generic Alternate MAC/PHY in Bluetooth high speed technology enables the radio to discover other high speed devices only when they are needed to transfer your music, pictures or other data. Not only does this optimize power, but it also aides in the security of the radios.Enhanced Power Control - Limited drop-outs are now a reality. The enhanced power control of Bluetooth high speed technology makes power control faster and ensures limited drop-outs, reducing consumer experience of impacts from power. Users are now less likely to lose a headset connection—even when the phone is in a coat pocket or deep inside a purse.Lower Latency Rates - Unicast Connectionless Data improves the customer experience of speed by lowering latency rates, sending small amounts of data more quickly.To the top 

Bluetooth Core Specification v2.1 + EDR

Bluetooth Core Specification Version 2.1 advanced short range wireless technology, making it easier for consumers to connect Bluetooth devices. Pairing devices with v2.1 is as easy as turning on the devices and selecting "add Bluetooth device" from the wireless connections menu. Devices find each other and connect automatically. This enhancement to the Core Specification provided:Lower Power Consumption - Reduced power consumption means longer battery life in devices like mice and keyboards. Bluetooth Specification Version 2.1 + EDR can increase battery life by up to five times.Improved Security - For pairing scenarios that require user interaction, eavesdropper protection makes a simple six-digit passkey stronger than a 16-digit alphanumeric character random PIN code. Version 2.1 also offers "Man in the Middle" protection that in reality eliminates the possibility for an undetected third party intercepting information.Near Field Communication - The pairing enhancements provided by v2.1 enabled the use of near field communication (NFC).To the top


Telephony Control Protocol (TCP)

This protocol defines the call controlsignaling for the establishment of speech and data calls between Bluetooth devices.

Example Products

Here are a few examples of the types of devices that you might find using the TCP:PDAMobile Phone

Getting Technical Overview

The Bluetooth Telephony Control protocol Specification Binary (TCS Binary) is based on the ITU-T Recommendation Q.931, applying the symmetrical provisions as stated in Annex D of Q.931 of the Telephony Control Protocol. The resulting text does not discriminate between user and network side, but merely between Outgoing Side (the party originating the call) and Incoming Side (the party terminating the call). Effort was made to only apply those changes necessary for Bluetoothtechnology and foreseen applications, enabling re-use of Q.931 to the largest extent possible.

Operations Between Devices

TCS uses point-to-point signaling and may use point-to-multipoint signaling. Point-to-point signaling is used when it is known to which side (Bluetooth device) a call needs to be established (single-point configuration).Point-to-multipoint signaling may be used when there are more sides available for call establishment (multi-point configuration); e.g. when, for an incoming call, a home base station needs to alert all phones in range.Point-to-point signaling is mapped towards a connection-oriented L2CAP channel, whereas point-to-multipoint signaling is mapped towards the connectionless L2CAP channel, which in turn is sent as broadcast information on the beacon channel (piconet broadcast).The figure above illustrates point-to-point signaling to establish a voice or data call in a single-point configuration. First, the other device is notified of the call request using the point-to-point signaling channel (A). Next, this signaling channel is used to further establish the speech or data channel (B).

OverviewA2DPAVRCPBIPBPPCIPCTPDUNFAXFTPGAVDPGOEPHFPHCRPHSPHIDICPOPPPANSDAPSPPSYNCVDPAVCTPAVDTPBNEPOBEXTCPRFCOMM
https://qualweb.bluetooth.org/Building/HowTechnologyWorks/ProfilesAndProtocols/Overview.htm