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ent battery voltage service a collection of related characteristics which operate together to perform a particular function for instance the health thermometer service includes characteristics for a temperature measurement value and a time interval between measurements descriptor a descriptor provides additional information about a characteristic for instance a temperature value characteristic may have an indication of its units e g celsius and the maximum and minimum values which the sensor can measure descriptors are optional each characteristic can have any number of descriptors some service and characteristic values are used for administrative purposes for instance the model name and serial number can be read as standard characteristics within the generic access service services may also include other services as sub functions the main functions of the device are so called primary services and the auxiliary functions they refer to are secondary services identifiers edit services characteristics and descriptors are collectively referred to as attributes and identified by universally unique identifiers uuids any implementer may pick a random or pseudorandom uuid for proprietary uses but the bluetooth sig have reserved a range of uuids of the form xxxxxxxx 0000 1000 8000 00805f9b34fb 71 for standard attributes for efficiency these identifiers are represented as 16 bit or 32 bit values in the protocol rather than the 128 bits required for a full uuid for example the device information service has the short code 0x180a rather than 0000180a 0000 1000 the full list is kept in the bluetooth assigned numbers document online gatt operations edit the gatt protocol provides a number of commands for the client to discover information about the server these include discover uuids for all primary services find a service with a given uuid find secondary services for a given primary service discover all characteristics for a given service find characteristics matching a given uuid read all descriptors for a particular characteristic commands are also provided to read data transfer from server to client and write from client to server the values of characteristics a value may be read either by specifying the characteristic s uuid or by a handle value which is returned by the information discovery commands above write operations always identify the characteristic by handle but have a choice of whether or not a response from the server is required long read and long write operations can be used when the length of the characteristic s data exceeds the mtu of the radio link finally gatt offers notifications and indications the client may request a notification for a particular characteristic from the server the server can then send the value to the client whenever it becomes available for instance a temperature sensor server may notify its client every time it takes a measurement this avoids the need for the client to poll the server which would require the server s radio circuitry to be constantly operational an indication is similar to a notification except that it requires a response from the client as confirmation that it has received the message battery impact edit bluetooth low energy chipset power consumption when acting as a beacon as per the hitchhikers guide to ibeacon hardware by aislelabs 72 bluetooth low energy is designed to enable devices to have very low power consumption several chipmakers including cambridge silicon radio dialog semiconductor nordic semiconductor stmicroelectronics cypress semiconductor silicon labs and texas instruments had introduced bluetooth low energy optimized chipsets by 2014 devices with peripheral and central roles have different power requirements a study by beacon software company aislelabs reported that peripherals such as proximity beacons usually function for 1 2 years powered by a 1 000 mah coin cell battery 73 this is possible because of the power efficiency of bluetooth low energy protocol which only transmits small packets as compared to bluetooth classic which is also suitable for audio and high bandwidth data in contrast a continuous scan for the same beacons in central role can consume 1 000 mah in a few hours android and ios devices also have very different battery impact depending on type of scans and the number of bluetooth low energy devices in the vicinity 74 with newer chipsets and advances in software by 2014 both android and ios phones had negligible power consumption in real life bluetooth low energy use 75 2m phy edit bluetooth 5 has introduced a new transmission mode with a doubled symbol rate bluetooth le has been traditionally transmitting 1 bit per symbol so that theoretically the data rate doubles as well however the new mode doubles the bandwidth from about 1 mhz to about 2 mhz which makes for more interferences on the edge regions the partitioning of the ism frequency band has not changed being still 40 channels spaced at a distance of 2 mhz 76 this is an essential difference over bluetooth 2 edr which also doubled the data rate but was doing that by employing a π 4 dqpsk or 8 dpsk phase modulation on a 1 mhz channel while bluetooth 5 continues to use just frequency shift keying the traditional transmission of 1 mbit in the bluetooth basic rate was renamed 1m phy in bluetooth 5 the new mode at a doubled symbol speed was introduced as the 2m phy in bluetooth low energy every transmission starts on the 1m phy leaving it to the application to initiate a switch to the 2m phy in that case both sender and receiver will switch to the 2m phy for transmissions this is designed to facilitate firmware updates where the application can switch back to a traditional 1m phy in case of errors in reality the target device should be close to the programming station at a few meters le coded edit bluetooth 5 has introduced two new modes with lower data rate the symbol rate of the new coded phy is the same as the base rate 1m phy but in mode s 2 there are two symbols transmitted per data bit in mode s 2 only a simple pattern mapping p 1 is used which simply produces the same stuffing bit for each input data bit in mode s 8 there are eight symbols per data bit with a pattern mapping p 4 producing contrasting symbol sequences a 0 bit is encoded as binary 0011 and a 1 bit is encoded as binary 1100 77 in mode s 2 using p 1 the range doubles approximately while in mode s 8 using p 4 it does quadruple 78 the le coded transmissions have not only changed the error correction scheme but it uses a fundamentally new packet format each le coded burst consists of three blocks the switch block extended preamble is transmitted on the le 1m phy but it only consists of 10 times a binary 00111100 pattern these 80 bits are not fec encoded as usual but they are sent directly to the radio channel it is followed by a header block fec block 1 which is always transmitted in s 8 mode the header block only contains the destination address access address 32 bit and an encoding flag coding indicator 2 bit the coding indicator defines the pattern mapping used for the following payload block fec block 2 where s 2 is possible 79 the new packet format of bluetooth 5 allows transmitting from 2 up to 256 bytes as the payload in a single burst this is a lot more than the maximum of 31 bytes in bluetooth 4 along with reach measurements this should allow for localisation functions as a whole the quadrupled range at the same transmission power is achieved at the expense of a lower data being at an eighth with 125 kbit the old transmission packet format as it continues to be used in the 1m phy and 2m phy modes has been named uncoded in bluetooth 5 the intermediate le coded s 2 mode allows for a 500 kbit data rate in the payload which is both beneficial for shorter latencies as well lower power consumption as the burst time itself is shorter see also edit ant ant bluetooth low energy denial of service attacks dash7 eddystone ieee 802 15 ieee 802 15 4 2006 indoor positioning system ips lora myrianed thread ultra wideband uwb uwb forum wimedia alliance wirelesshd wireless usb zigbee z wave nearlink sparklink low energy sle notes edit mimosa stands for mi crosystems platform for mo bile s ervices and a pplications 13 and is the name of one of the projects funded by the european framework programmes for research and technological development stmicroelectronics went on to release a processor to support implementation of the standard 14 references edit bluetooth smart or version 4 0 of the bluetooth specification bluetooth com bluetooth sig archived from the original on 10 march 2017 gomez carles oller joaquim paradells josep 29 august 2012 overview and evaluation of bluetooth low energy an emerging low power wireless technology sensors 12 9 11734 11753 bibcode 2012senso 1211734g doi 10 3390 s120911734 issn 1424 8220 pmc 3478807 beacons bluetooth com bluetooth sig archived from the original on 24 october 2014 retrieved 21 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13 january 2026 1 2 auracast for developers bluetooth com bluetooth sig retrieved 13 january 2026 public broadcast profile 1 0 bluetooth com bluetooth sig 5 july 2022 retrieved 13 january 2026 telephony and media audio profile 1 0 bluetooth com bluetooth sig 11 june 2022 retrieved 13 january 2026 hearing access profile 1 0 bluetooth com bluetooth sig 7 june 2022 retrieved 13 january 2026 broadcast audio scan service 1 0 bluetooth com bluetooth sig 7 june 2022 retrieved 13 january 2026 published audio capabilities service 1 0 1 bluetooth com bluetooth sig 21 june 2022 retrieved 13 january 2026 hunn nick november 2024 introducing bluetooth le audio 2nd edition including auracast pdf isbn 979 8 34 094194 7 retrieved 13 january 2026 via bluetooth com a new bluetooth audio scan to listen experience bluetooth com bluetooth sig retrieved 13 january 2026 midi over bluetooth low energy ble midi midi org ens wearables bluetooth com bluetooth sig archived from the original on 25 january 2021 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