Bluetooth Technology, Communication, Connect, Version and System
Bluetooth is a word from the tenth Century Bluetooth nickname king of Denmark halad II Harald, “Bluetooth” advocated by the five of the world’s famous company: Ericsson, IBM, Intel, NOKIA, Toshiba, and founded Bluetooth Special Interest Group-SIG in 1998.5, The organization transfers the patented technology to the industry, and realize the global standard. More Bluetooth Technology products have been used in past day, “Bluetooth SIG (special interest group)” corporate membership has more than 800.
Bluetooth Technology Parameters
Bluetooth 1.0, 1.1, 1.2
Bluetooth 4.0 vs Bluetooth 4.1
What is bluetooth used for?
Bluetooth is a radio technology that supports short-range communication within equipment (usually within 10m). Wireless information exchange can be carried out between devices including mobile phones, PDA, wireless headsets, notebook computers and related peripherals. Using “Bluetooth” technology, can effectively simplify the communication between the mobile communication terminal equipment, can successfully simplify communication between the equipment and the Internet Internet, become more rapid and efficient data transmission, widen the road for wireless communication. Bluetooth uses distributed network architecture and fast frequency hopping and short packet technology， support point-to-point and point-to-point communications, working in the global 2.4GHz ISM (ie, industry, science, medicine) frequency band. Its data rate is 1Mbps. Full duplex transmission is realized by time division duplex transmission scheme.
How bluetooth works?
Bluetooth product is used in frequency hopping technology, can resist signal fading; the fast frequency hopping and short packet technology, can effectively reduce the same frequency interference, improve the communication security; using FEC encoding technology, in order to reduce the interference of random noise in long distance communication; using 2.4GHz ISM (industry, science, medicine) band, to avoid the trouble of exclusive license application; using FM modulation, the equipment becomes more simple and reliable; the “Bluetooth” technology products to send a frequency of a synchronous packet, a packet for each with a time slot, can also be increased to 5 slots; “Bluetooth” technology to support a asynchronous data channel, or 3 concurrent synchronous voice channel, or a transmit asynchronous data and synchronous speech channel. Each voice channel of “Bluetooth” supports synchronous voice of 64Kbps, the maximum rate of asynchronous channel support is 721Kbps, the reverse response rate is 57.6Kbps asymmetric connection, or the symmetrical connection of 432.6Kbps.
The standard of Bluetooth is IEEE 802.15.1, and the Bluetooth protocol works in the 2.45GHz without permission ISM (Industrial, Scientific, Medical) frequency band. To avoid interference with other protocols that may use 2.45GHz, the Bluetooth protocol divides the band into 79 channels (1MHZ bandwidth) with 1600 channels per second. Comparing Bluetooth to WiFi is inappropriate because WiFi is a faster protocol with a larger coverage. Although both use the same frequency range, WiFi needs more expensive hardware. Bluetooth design is used to create wireless connections between different devices, and WiFi is a wireless LAN protocol. The purpose of the two is different.
Communication between Bluetooth technology products and Internet Internet, make Home and office equipment can be interconnected without cables, Greatly improve office and communication efficiency.Therefore, “Bluetooth” will become the new favorite in the field of wireless communications, and will be greatly favored for the vast number of users.
|Asynchronous channel:||asymmetric connection, 721/57.6kb/s, symmetric connection, 432.6kb/s.|
|Synchronous channel rate:||64Kb/s.|
|Power:||USA FCC requires < 0dbm (1mW), and other countries can be expanded to 100mW.|
|The frequency hopping frequency:||79 frequency points /MHz.|
|The frequency hopping rate:||1600 times /s.|
|Data connection mode:||connection oriented service, SCO, connectionless service, ACL.|
|Error correction mode:||1/3FEC, 2/3FEC, ARQ.|
|Authentication:||uses reactive logic arithmetic.|
|Channel encryption:||uses 0 bit, 40 bit and 60 bit keys.|
|Continuous variable:||slope modulation for speech coding CVSD.|
|Launch distance:||generally up to 1~10m, increase power, up to 100m.|
HeadsetPro-file (HSP) stands for headphones, providing the basic functionality needed to communicate between the headset and the cell phone. This is the most commonly used configuration for current popular support for Bluetooth headsets and mobile phones. Sound output 8 bits, 8 kHz. Provide answering call, hang up and volume adjustment function. Describes how Bluetooth headsets communicate with computers or other Bluetooth devices, such as mobile phones. After the connection and configuration, the headset can be used as the audio input and output interface of the remote device.
HandFreeProfile (HFP) stands for hands-free, and the sound output is 8 bits, 8 kHz, just like HFP, and HFP adds some extensions to the HSP. The format of the HFP Bluetooth headset support mobile phone function more complete, redial, call reservation, call option to listen to such hands-free consumers can set a good mobile phone headset operation.
Advanced Audio Distribution Profile (A2DP) refers to the Bluetooth audio transmission model protocol.
A2DP is the advanced audio delivery specification, A2DP is able to use the headset chip to stack data, to achieve high definition of sound. Allow stereo audio signal transmission, compared to mono HSP and HFP encryption, the quality is much better to let two.A2DP also supports Bluetooth audio transmission device connected to each other, can output such as CD quality (16 bits, 44.1 kHz) like music. If one party does not support A2DP, then the sound can output Handsfree Profile (8 bits, 8 kHz), even if the headset is designed using binaural tube, only mono sound general telephone, far from the real stereo.
AVRCP (audio / video remote control specification) – used to send commands from a controller (such as a stereo headset) to a target device (such as a computer with an MediaPlayer) (such as a previous jump, pause, and playback).
SBC (Sub-band, coding, subband coding)
The earliest format should be SBC, SBC is A2DP (Advanced Audio, Distribution Profile, Bluetooth audio transmission protocol) protocol mandatory coding format. All Bluetooth will support this protocol, so all Bluetooth audio chips will support the protocol. SBC coding in the transmission rate, specific parameters have not been found, according to Sony official website publicity data given is: 328Kbps, 44.1KHZ.
This code rate is almost the same as high quality MP3. But because the Bluetooth intermediate device needs transcoding, the transcoding process is MP3->PCM->SBC->PCM, taking the MP3 file as an example, and each transcoding loses detail, resulting in SBC’s listening sense worse than the original MP3.
ACC (Advanced, Audio, Coding, advanced audio coding)
ACC is a Dolby laboratory technology for the music community, is a high compression ratio coding algorithm. The actual experience is that the same rate below, ACC listening sense is better than MP3, apple above ACC audio much.
So now the iPhone audio transmission format is also ACC format, the rate is similar to SBC, but listening to feel good according to SBC. Because I haven’t done any serious comparisons, I think it’s a little better than SBC.
APTX is CSR company’s proprietary coding algorithm, after Qualcomm acquisition, APTX in Android phones inside the promotion of great efforts. Official website: http://www.aptx.com/ in the official website of the support device, saw the oppo and Nokia figure.
According to the official website, aptX is divided into three types: aptX, aptX HD and aptX Low Latency, according to the names that are traditional aptX, high quality aptX (estimated to be increasing rate and low time delay (aptX) time when watching videos and playing the CS delay is very important).
The Qualcomm? aptX? audio coding algorithm originated in the late 1980s at Queen’s University Belfast. This innovative work was focused on bit rate reduction and achieved significant bit rate efficiencies while preserving audio quality.
aptX has been the best kept secret of the professional audio industry, used by major public broadcasters and film studios around the world. Now available on leading consumer devices, aptX enables music lovers to enjoy the rich listening experience that aptX delivers.
Now it’s Sony’s turn to play, and Sony is very simple, rough and improves the channel. On the support of LDAC devices, the Bluetooth communication rate is close to 1M.
LDAC can transmit about 3 times the average Bluetooth*1 data (*2 at the highest 990kbps speed), allowing you to listen to Hi-Res Audio*3 music in a wireless situation, and you can hear the tone near Hi-Res Audio.
At such a high rate of transmission, lossless lossless transmission of music became possible. Of course, this kind of near private protocol transport format also leads to a few devices compatible now. But there is no doubt that LDAC has been greatly improved at the rate of transmission, so that the quality of the audio transmission is higher, listening is naturally the best.
Bluetooth 1.X version of Bluetooth technology has experimental nature, and is less used by manufacturers.
Bluetooth 1.1 was the earliest version, with a transmission rate of about 748~810kb/s, because it was designed early and was susceptible to interference from products of the same frequency, which affected the quality of communications. Transmission requirements of Stereo audio support, but can only be (Dan Gong) work, plus the tape frequency response is not enough, is not the best tool for Stereo transmission.
Bluetooth 1.2 is also only 748~810kb/s transmission rate, but added (improved Software) anti-jamming frequency hopping function.
The main upgrade of Bluetooth, 2.0+EDR and Bluetooth 1.X is reflected in the transmission speed, and the actual speed can reach 2Mbps. 2.0+EDR has increased the bandwidth transmission of data stream on the basis of guaranteeing stereo transmission, and can be used in higher quality music broadcasting. But the version, due to difficulties in pairing, still uses fewer equipment, and the standard will expire in November 14.
EDR, that is, Enhanced data rate, is the abbreviation of the rate of increase in Bluetooth technology. It is characterized by greatly improving the data transmission rate of Bluetooth technology, reaching 2.1Mbps, which is three times of the Bluetooth technology. Thus, in addition to lower power consumption for more stable audio streaming delivery, it also takes full advantage of bandwidth while connecting multiple Bluetooth devices.
Bluetooth 2 is a 1.2 improvement upgrade version, transmission rate of about 1.8M/s~2.1M/s, to support the duplex mode that one voice communication, but also can transfer files / high quality pictures, of course, version 2 also supports Stereo operation. Bluetooth headsets do not really work, and version 2 also supports Stereo operations. Subsequently, the Bluetooth 2 version of the chip has the opportunity to join the Stereo decoder chip, and even A2DP (AdvancedAudioDistributionProfile) can not be needed.
The most widely used is the Bluetooth 2.0+EDR standard, which was launched in 2004, and a large number of products supporting Bluetooth 2.0+EDR standards were also introduced in 2006.
Although the Bluetooth 2.0+EDR standard has made a great deal of technical improvements, the complexity of the configuration process and the large power consumption of the equipment continue to exist from the 1.X standard.
In August 2, 2007, in order to improve the Bluetooth technology problems, Special InterestGroup introduced the Bluetooth 2.1+EDR version of Bluetooth technology. To improve the device matching process: in the past, in the connection process, need to ensure the security of the connection using the personal identification code, and the connection mode of the improvement is automatically paired with the use of digital password to connect, for example, as long as the mobile phone options to choose the specific connection device, in the set, mobile phone will automatically list can be used in the current environment of equipment, and automatic link; and matching the short distance: also have between two support Bluetooth mobile phone pairing and communication each other NFC (Near Field CoMMunication) mechanism; better power-saving effect: Bluetooth version 2.1 added Sniff Subrating function, through mutual confirmation the transmission interval signal set between 2 devices to achieve the purpose of saving power consumption.
Bluetooth 2.1 will signal transmission time interval mutual recognition between devices from the old version of the 0. second extended to 0.5 seconds, so can make the Bluetooth chip work load is reduced greatly, but also let the Bluetooth can have more time to sleep. According to the official report, after using this technique, the standby time of the Bluetooth device can be effectively extended more than 5 times after the Bluetooth is turned on.
The main upgrade of Bluetooth, 2.1+EDR, and Bluetooth 2.0+EDR is embodied in the adoption of fast pairing technology, SSP, where users do not have to enter paired PIN codes. Bluetooth 2.1 is the most current version of the device.
In April 21, 2009, Bluetooth SIG issued a new generation standard “Bluetooth Version 3 High Core Specification Speed”, Bluetooth 3 is the core of “Generic Alternate MAC/PHY” (AMP), which is a new alternative RF technology, allows the Bluetooth protocol stack for any of the tasks dynamically select the correct rf.
Bluetooth 3.0+HS applies the Wi-Fi technology according to the 802.11 adaptation layer protocol, that is, after pairing the Bluetooth, calling 802.11 WiFi when needed, for high-speed data. “+HS” (High Speed) is an optional technology, not all Bluetooth 3 supports the speed of 24Mbps transmission.
Technologies originally expected to be used for new specifications include 802.11 and UMB, but the new specification eliminates the application of UMB. As a new version of the specification, Bluetooth 3 will naturally have higher transmission rates, while the secret is on the 802.11 wireless protocol. By integrating the “802.11PAL” (protocol adaptation layer), Bluetooth 3 data transfer rate increased to about 24Mbps (you can call 802.11WI-FI for high-speed data transmission when needed). It is eight times the size of Bluetooth 2. It can be easily used for data transmission between video recorders and HDTV, PC to PMP, UMPC to printer. Power, via Bluetooth 3 high-speed mass data transmission will naturally consume more energy, but due to the introduction of enhanced power control (EPC) mechanism, supplemented by 802.11, the actual idle power consumption will be significantly reduced, standby power consumption of Bluetooth devices is expected to be initially resolved. In addition, the new specification also has two techniques, namely the general test method (GTM) and one-way broadcast connectionless data (UCD), and includes a set of HCI instructions to obtain the key length. Allegedly, equipped with Bluetooth 2.1 module PC, in theory, you can upgrade firmware, so that Bluetooth 2.1 devices also support Bluetooth 3. Alliance members have begun developing Bluetooth 3 solutions for device
Bluetooth 4.0 officially released on July 7, 2010, the greatest significance lies in the new version of the low power consumption, while strengthening equipment compatibility between different OEM vendors, and reduce the delay, the maximum transmission speed is 24Mbps theory (3MB/s), the effective coverage expanded to 100 meters (the previous version is 10 meters). The standard chip is adopted by a large number of mobile phones and tablets
The most important feature of Bluetooth 4.0 is power saving. Very low running and standby power can make a button cell work continuously for years. In addition, low cost and cross vendor interoperability, 3 ms low delay, AES-128 encryption and many other features, can be used in many fields of pedometer, heart rate monitor, intelligent instrument, sensor networking, greatly expanded range of applications of Bluetooth technology.
Bluetooth 4.0 is Bluetooth 3.0+HS specification, specifically for wireless solutions have higher requirements on the cost and power consumption, can be widely used in health care, physical fitness, family entertainment, security and other fields.
supports two deployments: dual mode and single mode. Dual mode, low-power Bluetooth Bluetooth controller integrated in the classic existing, or in the existing classic Bluetooth Technology (2.1+EDR/3.0+HS) to increase the low power chip stack, the overall structure is basically unchanged, so the cost increase is limited.
Single mode can only be transmitted to each other with BT4.0 and cannot be down compatible (not communicated with 3.0/2.1/2.0); Dual mode can be down compatible, can be transmitted with BT4.0, or can be transmitted with 3.0/2.1/2.0.
Single mode for highly integrated and compact device, using a lightweight connection layer (Link Layer) operation, ultra low power standby mode simple equipment recovery and reliable point to multipoint data transmission, can make networked sensors arranged in the Bluetooth Bluetooth low power flow transmission in the order, as well as advanced energy saving and secure encrypted connection.
Bluetooth 4.0 integrates three specifications, including traditional Bluetooth technology, high-speed technology and low energy technology. Compared with the 3 version, the biggest difference is low power consumption. Bluetooth 4.0 is Bluetooth 3.0+HS, in “classic norms” (can be seen as the Bluetooth 2.1 upgrade) and “high standard” (+HS) on the two standards, increase the “low power specification (Bluetooth Low Energy)”.
in the implementation of hardware, Bluetooth 4.0 can be integrated in the existing classic Bluetooth Technology (2.1+EDR/3.0+HS) chip increase low power part (dual mode, relatively lower cost), you can also add a separate connection layer in highly integrated devices (Link, Layer) Bluetooth transmission to achieve ultra low power (single mode). Low power Bluetooth 4 will be widely used with the upgrade of Android system.
Bluetooth from version 4.0 onwards, joined the revolutionary BLE protocol, while Bluetooth 2.1+EDR and Bluetooth 3.0+HS are all included. At present, this technology can provide three kinds of wireless connection for manufacturers and users, including the traditional Bluetooth technology for multiple categories of consumer electronics products; for Bluetooth high speed camera, mobile phone, technology camera, PC and TV, video, music and image transmission; and for health care and health, personal equipment, automobile and automation industry low power sensing equipment and new network services Bluetooth low energy technology.
Bluetooth 4.1 was released on December 6, 2013, and the LTE radio signal if the simultaneous transmission of data, transmission of information that Bluetooth 4.1 can automatically reconcile the two, it can reduce the interference of other signal Bluetooth 4.1. The improvement is to enhance the connection speed and more intelligent, such as to reduce the time of re connection between devices, means that if the user out of the Bluetooth 4.1 signal range and disconnection time is not very long, when the user back to the signal range of the device will be automatically connected again, the reaction time to 4 less than Bluetooth. The last improvement is to improve the transmission efficiency. If the user has many connections, such as connecting multiple wearable devices, the information between them can be sent to the receiving device immediately.
If Bluetooth 4.0 is the main feature of power saving, then the upgrade of Bluetooth 4.1 keyword should be IOT (full Networking), that is, all devices are networked meaning. To achieve this, improvements in communication capabilities are one of the most important improvements in Bluetooth 4.1. In addition, Bluetooth 4.1 also for developers to increase more flexibility, this change does not have a big impact on ordinary users, but it is very important for software developers, because in order to wearable devices to rise gradually, then Bluetooth must be able to support multiple devices connected at the same time.
Bluetooth 4.1 “Internet of things” as the goal of the Bluetooth 4 software upgrade, enhance connectivity in embodied in the following aspects (hardware level Bluetooth 4 devices do not need to make any changes can be used to Bluetooth 4.1).
Under the Bluetooth 4.1 standard, Bluetooth devices can act as both Smart (Bluetooth) and Ready Smart (Bluetooth) and can be connected to multiple devices. For example, smart watches can be used as the launch direction of mobile phones to launch body health index, while the receiver is connected to the Bluetooth headset / bracelet or other devices; long sleep under the Automatic wake-up function. For example, after wearing a bracelet for 1 hours swimming back to the locker room, the bracelet will automatically establish a connection with the mobile phone, transmit data, do not need any operation; establish network connections through IPv6. The Bluetooth device only needs to be connected via Bluetooth 4.1 to devices that can access the Internet, such as mobile phones, so that IPv6 can synchronize with data from the cloud. That is, “cloud synchronization” no longer requires the WiFi connection (the cost of the WiFi module is usually higher and more expensive).
In December 4, 2014, the latest Bluetooth 4.2 standard, improved data transmission speed and privacy protection, and access to the device, will be accessible directly through the IPv6 and 6LoWPAN access to the internet. Under the new standard, Bluetooth signals want to connect or track user equipment, which must be licensed by the user, otherwise the Bluetooth signal will not connect and track user equipment.
What are the improvements to the Bluetooth 4.2 standard? The biggest improvement in Bluetooth 4.2 is support for 6LowPAN, a low-power wireless personal area network technology based on IPv6 protocols. This technology allows multiple Bluetooth devices to access the Internet or LAN via a single terminal. Another improvement in privacy, now Bluetooth devices will be connected to the terminal trusted, will request the user permission before and unfamiliar terminal connection, this improvement can prevent users from inadvertently exposed their positions or leave their records. In the transmission performance, Bluetooth 4.2 standard data transmission speed ratio Bluetooth 4, Bluetooth 4.1 increased 2.5 times, mainly due to Bluetooth intelligent packet capacity compared to the previous increased 10 times, while reducing the transmission error rate.
The biggest improvement in Bluetooth 4.2 is support for 6LowPAN, a low-power wireless personal area network technology based on IPv6 protocols. This technology allows multiple Bluetooth devices to access the Internet or LAN via a single terminal. In smart home systems, traditional home electrical devices are likely to connect to the LAN for easy interaction and control, but most devices are not suitable for high bandwidth, high power WiFi access.
Intelligent socket, intelligent switch, intelligent lamp, air conditioner, purifying / humidifying equipment, kitchen appliance and so on are more suitable for Bluetooth transmission. Under previous standards, each device must be connected to a smartphone or PC to be controlled, which greatly limits the use of Bluetooth scenarios. Bluetooth 4.2 makes the same room only one or two Bluetooth to the local area network access terminal (such as support for Bluetooth 4.2 wireless AP), you can make room for all Bluetooth 4.2 devices to access home network without the participation of the mobile phone or PC.
In this way, most smart home appliances can discard more complex WiFi connections and switch to portable, compact and low-power Bluetooth transmission. On the other hand, since the WiFi network begins to migrate to the 5GHZ band, the Bluetooth in the 2.4GHZ band can avoid interference with the WiFi. A large number of devices used in Bluetooth will reduce the parallel transmission pressure of routers on the WiFi side, and improve the performance of the entire home lan.
In the commercial arena, Bluetooth 4.2 is also promising. For example, a street street light can be connected in tandem and connected to an urban junction network at the intersection – so there is no need to ensure that each street light is within the coverage of the WiFi signal or 3/4G signal. The restaurant can be in all meals to install a small Bluetooth pager, convenient for customers to call the waiter, see meal preparation schedule.
Factories can install Bluetooth monitoring chips for critical equipment, remote real-time view of machine status and so on. Compared to the WiFi Bluetooth connection, low cost, very small and very energy-efficient chips, can be used as WiFi/ network cable network two connection layer, a large number of short messages only need to transfer all the equipment easily into the whole network. Due to the direct support of IPv6, Bluetooth 4.2 device is easy to remote discovery and control after accessing LAN, and its application is more extensive.
Another major improvement in Bluetooth 4.2 is the privacy level. Now, Bluetooth devices only connect trusted terminals and ask for permission before connecting to an unfamiliar terminal. This improvement prevents users from inadvertently revealing their location or leaving their records.
In the past, Bluetooth enabled mobile phones can be easily recorded by the people around you and the Bluetooth MAC address. After this, this situation will not exist, and the user can feel more comfortable and open the Bluetooth at any time. Of course, this is not good news for Apple’s iBeacon technology, which relies mainly on public Bluetooth connections for location and information collection. Next, Apple will be how to respond to this change, worthy of attention.
In terms of transmission performance, Bluetooth 4.2 has been upgraded at some level. Although the media widely reported Bluetooth 4.2, compared to the previous version, transmission bandwidth reached 2.5 times as much, but in fact, this upgrade is limited to Bluetooth low-power transmission mode. In the past, the transmission rate of low power Bluetooth connections was about 260Kbps, and the new standard was raised to 650Kbps. The full power state transmission rate is still 2.1Mbps. Considering that the new standard will be mainly used in low power Internet of things terminals, it is significant to enhance the low power transmission rate greatly.
A major advantage of the new standard is that it does not require hardware updates from existing devices, but only firmware upgrades can support it, but upgrading the performance of the transmission requires hardware changes. This means that a large number of existing Bluetooth devices may acquire new network connectivity through simple software updates, and that smart devices can also be developed quickly using mature Bluetooth chip packages.
It is expected that when the Bluetooth 4.2 standard is extended in 2015, most of the new IOT devices will adopt this standard to replace or supplement the WiFi connection. Smart routers or wireless AP that provide network access capabilities for Bluetooth 4.2 terminals will also be available in large numbers, providing users with a basic network environment. The new Bluetooth standard makes things a step closer to our lives, and we can quickly feel the many conveniences that it brings.
In June 17, 2016, the Bluetooth Technology Alliance (SIG) officially announced the Bluetooth 5 standard in washington. The performance of Bluetooth, the transmission speed is two times before the new version of the 4.2LE version, the data transfer capacity is reached 800%, its effective distance is 4 times the previous version, which means Bluetooth transmitting and receiving equipment between the effective theoretical distance to 300 meters. In addition to the faster transmission speed and further effective distance, the advantages of Bluetooth 5 are shown in the following aspects:
Internet of things capabilities, Bluetooth 5 for the Internet of things has been a lot of bottom optimization, and strive to lower power consumption and higher performance for smart home services.
Navigation function can be used as indoor navigation beacon or similar positioning equipment. Combined with WiFi, indoor positioning of less than 1 meters accuracy can be achieved.
Upgrade hardware, some of the earlier versions of the Bluetooth update only require upgrades, but Bluetooth 5 is likely to require upgrades to new chips. However, old hardware can still be compatible with Bluetooth 5, and you won’t be able to enjoy its new performance. Equipped with Bluetooth 5 chip flagship mobile phone will be available in 2017, believe in the low-end mobile phone will also have continued the built-in Bluetooth 5 chip. Apple will be one of the first vendors to use the technology.
With more transport capabilities, the new Bluetooth 5 can add more data transfer capabilities, and hardware vendors can create more complex connection systems, such as Beacon or location-based services, through Bluetooth 5. As a result, ad data sent through the Bluetooth device can send a small amount of information to the target device, even without pairing
Lower power consumption, as everyone knows, Bluetooth is a necessary function of intelligent mobile phone, with smart devices and mobile payment etc. more and more need to open Bluetooth, can enjoy the convenience function gradually into people’s lives, the power consumption of Bluetooth has become a major killer of intelligent mobile phone standby time. To this end, Bluetooth 5 will greatly reduce the power consumption of Bluetooth, so that people in the use of Bluetooth in the process, there is no need to worry about short standby time.
Objective: if Bluetooth 4 is the main characteristic of saving electricity, so the upgrade Bluetooth 4.1 should be IOT (all things), that is all equipment networking means, improve data transmission, to meet the needs of wearable devices.
Transmission rate: Bluetooth 4.1 is upgraded on the basis of Bluetooth 4 LE, so that batch data can be transmitted at a higher rate.
The role of Bluetooth 4 LE devices have been arranged the role as “Bluetooth Smart” and “Bluetooth Smart Ready”; in Bluetooth 4.1, it allows the device to serve as the “Bluetooth Smart” and “Bluetooth Smart Ready” two roles, which means that a variety of devices connected to the a Bluetooth device.
Surfing the Internet: the problem of wearing equipment online is difficult, and can also be solved by Bluetooth 4.1.
Connection: two pieces of equipment with Bluetooth 4.1 have been successfully paired, re connect, as long as the two devices close to, you can achieve reconnection, without any manual operation.
The compatibility: Bluetooth 4.1 can not only be backwards compatible with Bluetooth 4, it is more important for the existing Bluetooth 4 device, do not need to replace the chip, only need to upgrade the firmware can be upgraded to Bluetooth 4.1.
Bluetooth 4.1 has also been optimized for 4G to ensure that it can coexist peacefully with the 4G signal, which is called the coexistence of Bluetooth technology alliance”. You might wonder if the mobile network signals and Bluetooth didn’t exist long ago. Why does Bluetooth 4.1 even deal with this? This is because in actual applications, if both of them transmit data at the same time, then Bluetooth communication may be disturbed by the mobile phone network signal, resulting in a decline in transmission rate. So in the new Bluetooth 4.1 standard, once the Bluetooth 4.1 and 4G network data transmission at the same time, the transmission of information then Bluetooth 4.1 will automatically reconcile the two, thereby reducing other signals of 4.1 Bluetooth interference, users also don’t have to worry about the problem of the transmission rate decreased.
In conclusion, the latest Bluetooth 4.1 standard is a promising technology with smart, low power, high transmission speed, and simple connection features that will be suitable for use in many emerging devices. Still, Bluetooth takes time to fully adapt to IPv6, and vendors need to consider allowing Bluetooth devices to be compatible with IPv6. If the current Bluetooth headset, even if it is networked, the current technology can not expect it to do very intelligent thing. And its cost will be relatively increased, for Bluetooth headphones, Bluetooth 4 standard can be regarded as a mature and practical choice from the technical point of view.
The Bluetooth version is more advanced and better nature, taking into account the transmission distance and power consumption issues, Bluetooth 4.1 is preferred, but currently on the market Bluetooth 4.1 products is not much, but the mainstream Bluetooth 4 product price is higher, as for Bluetooth 3, 2.1 and the following version has lost the purchase value.
Bluetooth has many advantages, such as perfect encryption measures, stable transmission process and compatible equipment. From version 1.1 to version 5, it has a difficult process, and the Bluetooth 2.1+EDR standards and the 4 standards are the most common and the most widely used. Bluetooth technology is closely related with our life, work, driving, entertainment, multimedia, through the use of Bluetooth technology, people can remove the home office cable winding distress, hands-free telephone conference held by connecting to the speaker through the mobile phone, wireless stereo headset listen to streaming music from home audio or other similar audio transmission equipment.
Every generation of Bluetooth standard upgrade, I believe that the tablet phone and other electronic products are full of attractive. With a higher version of the Bluetooth standard, it will improve overall performance, such as a wider range of pairings, higher transmission speed, more energy efficient, direct access to the Internet and so on. In addition, I believe that the future of Bluetooth applications will be more widely, more fit users.