Download - Handouts WSNs BT-LE
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Outline
• Introduction
• Applications
• Architecture
• Topology
• Controller specifications:
– Physical Layer
– Link Layer
• Host specifications: upper layers
• Products on the market
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Introduction (1/2)
Bluetooth: • Wireless technology for short-range communication
• Replacement to cables connecting portable and/or fixed electronic
devices
• Key features:
worldwide operation
robustness
low power consumption
low cost
interoperability
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Introduction (2/2)
Bluetooth Core Specification v4.0 (adopted 30 June 2010)
• Two main configurations
1. Basic Rate (BR)
Optional Enhanced Data Rate (EDR) and Alternate MAC and PHY
(AMP) extensions
2. Low Energy (LE)
Lower power consumption devices operated with coin cell batteries
Lower complexity
Lower cost
Lower data rates
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Applications (1/7)
Automotive
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Applications (2/7)
Sports and fitness
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Applications (3/7)
Healthcare
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Applications (4/7)
Entertainment
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Applications (5/7)
Home automation
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Applications (6/7)
Security and proximity
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Applications (7/7)
Advertising
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YOU ARE
HERE
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Architecture
Generic Access
Profile (GAP)
PU
ID
Re
mo
te
Co
ntro
l
Pro
xim
ity
…
He
art R
ate
Generic Attribute Profile (GATT) Security Manager
Protocol (SMP) Attribute Protocol (ATT)
Logical Link Control and Adaptation Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Implementation modes
• Single-mode (stand-alone) implementation:
targeted at low power consumption and small size
devices
• Dual-mode implementation: extension to a classic
Bluetooth radio, targeted at mobile phones and
PCs
13
Dual-mode
device LE single-mode
device LE single-mode
device
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Network topology
• Piconet: star topology
• Broadcast group
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Master
Slaves
Advertiser
Scanners
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Controller specification
15
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Physical Layer (1/2)
• Modulation: Gaussian Frequency Shift Keying
(GFSK)
Bandwidth-bit period product: BT = 0.5
Modulation index: 0.45 < h < 0.55
Bit-rate: Rb = 1Mbit/s
• Transmission power: -20 dBm < Ptx < + 10 dBm
• Receiver sensitivity: -70 dBm
[BER < 0.1%]
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Physical Layer (2/2)
• Band: ISM @ 2.4 GHz
40 channels of 2 MHz
f = 2402 + i*2 MHz, i=0,…,39
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PHY performance (1/2)
BLUETOOTH
LOW
ENERGY
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PHY performance (2/2)
Normalized
power
spectrum [dB] 1.5 Rb 802.15.4 3 MHz
Bluetooth LE 1.5 MHz
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Controller specification
20
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Link Layer: state machine
Advertiser
Tx Advertising packets
Initiator
Listen to Advertising
packets and respond to
initiate a connection
Slave/Master
Tx/Rx data packets
Scanner
Listen to Advertising packets
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Link Layer: channels
• RF Channels are allocated into two types:
1. Advertising physical channel (i = 0, 12, 39):
discovering devices, initiating a connection, broadcasting
data
2. Data physical channel (the other 37 RF channels):
communication between connected devices
22
MH
z
24
02
2
40
4
24
06
2
40
8
24
10
2
41
2
24
14
2416
24
18
2
42
0
24
22
2
42
4
24
26
2
42
8
24
30
2
43
2
24
34
2
43
6
24
38
2
44
0
24
42
2
44
4
24
46
2
44
8
24
50
2
45
2
24
54
2
45
6
24
58
2
46
0
24
62
2
46
4
24
66
2
46
8
24
70
2
47
2
2474
24
76
2
47
8
24
80
Adv
37
38
39
Data
0
1
2
3
4
5
6
7
8
9
10
11
1
2
13
1
4
15
1
6
17
1
8
19
2
0
21
2
2
23
2
4
25
2
6
27
2
8
29
3
0
31
3
2
33
34
35
3
6
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Link Layer: events
• Advertising events
• Connection events
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t
t
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Passive scanning
Advertisement
Advertisement
Advertisement
Advertisement
Advertisement
Advertisement
Found
device
Scanner Advertiser
Channel (x)
Channel (y)
Channel (z)
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Active scanning
Advertisement
Scan Request
Scan Response
(name, services) Found device
(name, services)
Scanner Advertiser
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Broadcasting data
Advertisement (data)
Found device
(data)
Scanner Advertiser
Advertisement (data)
Advertisement (data)
Advertisement (data)
Advertisement (data)
Advertisement (data)
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Initiating a connection
Advertisement
Initiator Advertiser
Connect Request
"poll"
Data
Ack
Master Slave
"null"
Communication
event interval
Channel (x)
Channel (y)
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Link Layer: PDU
Preamble Access
Address PDU Header PDU Payload CRC
1 byte 4 bytes 2 bytes variable (0 – 37
bytes) 3 bytes
• Identifies a LL connection between
two devices
• Fixed sequence for advertising PDUs
• Error checking
• Frequency synchronization
• Symbol timing estimation
• Automatic gain control
01010101
or
10101010
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Link Layer: advertising PDU
Preamble Access
Address PDU Header PDU Payload CRC
1 byte 4 bytes 2 bytes variable (0 – 37
bytes) 3 bytes
PDU type Res. TxAdd RxAdd Length Res.
4 bits 2 bits 1 bit 1 bit 6 bits 2 bits
PDU type Packet name PDU type Packet name
0000 ADV_IND 0011 SCAN_REQ
0001 ADV_DIRECT_IND 0100 SCAN_RSP
0010 ADV_NONCONN_IND 0101 CONNECT_REQ
0110 ADV_SCAN_IND other Reserved
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Link Layer: data PDU
Preamble Access
Address PDU Header PDU Payload CRC
1 byte 4 bytes 2 bytes variable (0 – 37
bytes) 3 bytes
LLID NESN SN MD Res. Length Res.
2 bits 1 bit 1 bit 1 bit 3 bits 5 bits 3 bit
Logical Link Identifier:
data or control PDU
Next expected sequence
number and sequence number:
• Acknowledgment
• Flow control
More Data bit
LLID Packet type
00 Reserved
01 LL Data PDU: continuation fragment of an L2CAP message or empty PDU
10 LL Data PDU: start of an L2CAP message
11 LL Control PDU
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HCI specification
31
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Host Controller Interface
• The HCI provides a uniform interface method of
accessing Bluetooth Controller‟s capabilities
(command PHY and LL, access hardware status,
control registers)
• Optional implementation
• Possibility of realizing separate Host and Controller
interoperability of different subsystems
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Host specification
33
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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L2CAP (1/2)
• L2CAP provides connection-oriented and
connection-less data services to upper layer
protocols
– Protocol multiplexing capability (not in case of LE only
Controller)
– Segmentation and reassembly
– Per-channel flow control and retransmission
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L2CAP (2/2)
• PDU format
35
Length CID Payload
2 bytes 2 bytes Variable (as specified in „Length‟)
• 0x0004 = Attribute Protocol
• 0x0005 = LE L2CAP Signaling channel
• 0x0006 = Security Manager Protocol
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Host specification
36
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Attribute Protocol (1/2)
• Attribute is „data‟ – Value with a meaning (UUID), permissions (read/write),
that is addressable by a handle
Attributes expose data on a remote device
• ATT is a peer-to-peer protocol between a server
and a client
– Server: contains attributes, receives requests, executes,
responds, can indicate values
– Client: sends requests, commands, waits for responses,
can confirm indications
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Attribute Protocol (2/2)
• Operations on attributes
– Push: the server sends the data to the client when it
changes or according to configuration
– Pull: a client request the data from the server when it
needs it
– Set: configuring a server (actuator)
– Broadcast: the server periodically broadcast the data
(using LL advertising PDUs)
– Get: the client requests for attributes handles and UUID
to discover the services that the server offers
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Host specification
39
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Generic Attribute Profile
• The GATT profile is designed to be used by an
application or another profile
• It defines how to use the ATT Protocol to discover,
read, write and obtain indications of server
attributes, as well as configuring broadcast of
attributes
• Attributes are grouped in services
– service = collection of data and associated behaviors
– characteristic = value used in a service along with
properties and descriptors (how it is accessed, displayed
and represented)
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Host specification
41
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Generic Access Profile
• A bluetooth profile defines the required functions
and features of each layer in the Bluetooth system
• GAP: base profile implemented by all devices
– Basic requirements of a device
– Description of behaviours and methods for device
discovery, connection establishment, security,
authentication, association models, service discovery
– Four LE device roles:
Broadcaster
Observer
Peripheral
Central
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Host specification
43
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Device profiles
• Profiles can be organized in a hierarchy
• Application profile: top level profile that describes
application interoperability
44
Application Profile #1
Generic Profile #1
GAP
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Security specifications
45
Generic
Access
Profile
(GAP)
PU
ID
Rem
ote
Contro
l
Pro
xim
ity
…
Heart
Rate
Generic Attribute
Profile (GATT) Security
Manager
Protocol
(SMP) Attribute Protocol
(ATT)
Logical Link Control and Adaptation
Protocol (L2CAP)
Host Controller Interface (HCI)
Link Layer (LL)
Physical Layer (PHY)
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Security (1/4)
• Bluetooth Low Energy provides
– Eavesdropping protection
– Man In The Middle protection
– Privacy of devices
• Security functions are split between host and
controller
– Controller LL: encryption and authentication
– Host SMP: security protocol
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Security (2/4)
Encryption and authentication
• AES128 – CCM cryptography
• Both hardware and software solutions
• A Message Integrity Check field is included in
every encrypted PDU at the end of the payload
• Bit stream process:
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SMP_SECURITY_INFORMATION
Security (3/4)
SMP
• Defines how to setup a secure link
– Key management and exchange
48
SMP_PAIRING_REQUEST
Master Slave
Pairing over SMP
Phase 1
Non secure LL connection established
SMP_PAIRING_RESPONSE
Establishment of encrypted connection with key
generated in Phase 2
SMP_IDENTITY_INFORMATION
Phase 2
Phase 3
(optional)
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Security (4/4)
Privacy
• Feature used to prevent device tracking
• Two types of address
1. Public: IEEE MAC address
2. Random: obtained through a hash function from the
IRK (Identity Resolving Key)
• Random addresses may be resolved only
knowing the IRK
• Random addresses may be changed frequently in
time
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Products on the market (1/7)
• NORDIC nRF8001
– Integrates both Controller and Host
– Serial interface to support external application
microcontrollers
– Designed for Peripheral role devices
– Temperature sensor
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Products on the market (2/7)
• Texas Instrument CC2540
– Integrates Controller, Host and Application
– Peripherals to interface with analog and digital sensors
– Single mode device
– Mini development kit includes:
CC 2540 Keyfob (LE slave), with an accelerometer sensor
CC2540 USB Dongle (LE master)
99 $
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Products on the market (3/7)
• BLUEGIGA BLE 112 Low Energy Module
– Integrates Controller, Host and Application space for
customer applications (no external processor needed)
– Hardware interfaces to connect sensors and/or simple
user interfaces
– Single mode device
– Designed for master and slave roles
– Battery monitor and temperature sensor
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Products on the market (4/7)
• BLUEGIGA BLED 112 Low Energy USB Dongle
– Integrates Controller, Host and Application
– Single mode USB device enabling LE connectivity for
PCs and other devices having a USB port
– BLE 112 Starter Kit includes:
2 BLE112 Modules
2 BLED112 USB Dongles
440 $
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Products on the market (5/7)
Device
Tx power [dBm] Rx
sensitivity
[dBm]
Current consumption Power supply [V]
min max Tx
(@ 0
dBm)
Rx sleep min max
NORDIC
nRF8001 - 18 0 - 87
13
mA
14.5
mA 0.5 µA 1.9 3.6
TI CC2540 - 20 + 4 - 93 27
mA
19.6
mA 0.4 µA 2 3.6
BLUEGIGA
BLE 112 /
BLED 112
- 23 + 4 - 93 27
mA
22.1
mA 0.4 µA 2 3.6
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Products on the market (6/7)
• Dayton Industrial Co. Ltd Heart Rate Belt
– Based on nRF8001 chip
– “Heart rate monitors are one of the first and most sought
after use cases for Bluetooth low energy” [Johnson
Chan, Product Engineering Manager at Dayton]
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Products on the market (7/7)
• Casio G-SHOCK Watch
– Automatic correct time update
– Incoming calls and messages notification
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References
• Specification of the Bluetooth System, version 4.0,
available at www.bluetooth.org, June 2010
• www.bluetooth.com
• www.ti.com
• www.nordicsemi.com
• www.bluegiga.com
• http://world.casio.com/news/2011/watch_prototype/
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