CN111182516B - Data transmission system of BLE link - Google Patents

Data transmission system of BLE link Download PDF

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CN111182516B
CN111182516B CN201911356520.5A CN201911356520A CN111182516B CN 111182516 B CN111182516 B CN 111182516B CN 201911356520 A CN201911356520 A CN 201911356520A CN 111182516 B CN111182516 B CN 111182516B
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ble
phy unit
timer
phy
int
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CN111182516A (en
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梁宏
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Spreadtrum Semiconductor Chengdu Co Ltd
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Spreadtrum Semiconductor Chengdu Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a data transmission system of a BLE link, which comprises at least 2 PHY units, wherein the at least 2 PHY units take an initial anchor point as a starting point, and sequentially process connection events in a preset time period respectively so as to transmit data, and the initial anchor point is the first anchor point of the BLE link. In the invention, each different type of PHY unit processes the connection event according to the preset time period, and the PHY unit can be correctly switched even if the transmission channel is not good, thereby ensuring the stability of data transmission.

Description

Data transmission system of BLE link
Technical Field
The invention belongs to the technical field of data transmission of BLE links, and particularly relates to a data transmission system of a BLE link.
Background
A BLE (Bluetooth Low Energy) connection link receives or transmits using a PHY (physical layer) unit, and is called symmetric connection (symmetric connection) when the same PHY is used for transmission and reception, and is called asymmetric connection (asymmetric connection) when different PHYs are used for transmission and reception. When the PHY needs to be changed, the PHY is changed through a PHY Update flow.
According to the application scene, the A device requests PHY update to send a message to the B device, the B device responds to the request to reply the message, and the A device confirms and sends a message for updating PHY notification. An updated BLE connection link through PHY Update may use different PHYs according to different traffic scenarios. For example, BLE 2M PHY (a physical layer) units are used when faster data transmission is required, and BLE Coded PHY (a physical layer) units are used when a longer transmission distance or a more complex interference environment is required.
Under the environment of complex interference or longer transmission distance, if a BLE Coded PHY unit is used, the Bluetooth transmission efficiency is influenced compared with that of a BLE 1M PHY (physical layer) unit or a BLE 2M PHY unit; if a BLE 1M PHY unit, or even a BLE 2M PHY unit, is used, transmission failures or shorter transmission distances may occur more easily than a BLE Coded PHY unit. If the channel condition is too bad, the message of BLE PHY Update cannot be successfully sent, and the PHY cannot be updated, and the PHY unit cannot be switched, even the connection is disconnected.
Disclosure of Invention
The invention aims to overcome the defect that PHY unit updating fails under the condition of poor channel condition in a BLE link in the prior art, and provides a data transmission system of the BLE link.
The invention solves the technical problems through the following technical scheme:
the invention provides a data transmission system of a BLE link, which comprises at least 2 PHY units, wherein the at least 2 PHY units take an initial anchor point as a starting point, and sequentially process connection events within a preset time period respectively so as to transmit data, and the initial anchor point is a first anchor point of the BLE link.
Preferably, the at least 2 PHY units include a BLE 2M PHY unit, a BLE Coded PHY unit.
Preferably, the at least 2 PHY units further comprise a BLE 1M PHY unit.
Preferably, the BLE 2M PHY unit processes the connection event within a [ N _ INT1, (N +1) INT1] time period;
the BLE Coded PHY unit processes the connection event in [ DLY + N INT2, DLY + (N +1) INT2] time period, N is an integer greater than or equal to 0, INT1 represents a first connection interval, INT2 represents a second connection interval, the initial anchor point is 0 time, DLY represents delay time, and DLY is greater than 0.
Preferably, INT2 is greater than INT 1.
Preferably, DLY is less than INT 1.
Preferably, the BLE 2M PHY unit is configured to transmit a data packet, and the BLE Coded PHY unit is configured to transmit a null packet; or, the BLE 2M PHY unit is used to transmit the data packet, and the BLE Coded PHY unit is used to retransmit the data packet.
Preferably, the BLE 2M PHY unit processes the connection event in [4 × N × INT ], (4 × N +1) × INT ] and [ (4 × N +1) × INT ], (4 × N +2) × INT ] periods, the BLE 1M PHY unit processes the connection event in [ (4 × N +2) × INT ], (4 × N +3) × INT ] periods, the BLE Coded PHY unit processes the connection event in [ (4 × N +3) × INT ], (4 × N +4) × INT ] periods, N is an integer greater than or equal to 0, the connection interval is characterized, and the initial anchor point is 0 time.
Preferably, the BLE 2M PHY unit includes a first timer, the BLE Coded PHY unit includes a second timer, the first timer and the second timer are configured to start timing at the same time as the initial anchor point, the first timer is configured to indicate a target time period for the BLE 2M PHY unit to process the connection event according to a timing value, and the second timer is configured to indicate the target time period for the BLE Coded PHY unit to process the connection event according to the timing value.
Preferably, the BLE 2M PHY unit comprises a first timer, the BLE Coded PHY unit comprises a second timer, and the BLE 1M PHY unit comprises a third timer;
the first timer is used for indicating a target time period for processing the connection event by the BLE 2M PHY unit according to a timing value, the second timer is used for indicating the target time period for processing the connection event by the BLE Coded PHY unit according to the timing value, and the third timer is used for indicating the target time period for processing the connection event by the BLE 1M PHY unit according to the timing value.
The positive progress effects of the invention are as follows: in the invention, each different type of PHY unit processes the connection event according to the preset time period, and the PHY unit can be correctly switched even if the transmission channel is not good, thereby ensuring the stability of data transmission.
Drawings
Fig. 1 is a schematic structural diagram of a data transmission system of a BLE link according to embodiment 1 of the present invention.
Fig. 2 is a timing diagram of a data transmission system of a BLE link according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a data transmission system of a BLE link according to embodiment 2 of the present invention.
Fig. 4 is a timing diagram of a data transmission system of a BLE link according to embodiment 2 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a data transmission system for a BLE link. The data transmission system of the BLE link comprises at least 2 PHY units, wherein the at least 2 PHY units take an initial anchor point as a starting point, and sequentially process connection events within a preset time period respectively so as to transmit data, and the initial anchor point is a first anchor point of the BLE link.
Referring to fig. 1, the data transmission system of the BLE link of the present embodiment includes a first PHY unit 11 and a second PHY unit 12. As an alternative embodiment, the first PHY unit 11 is a BLE 2M PHY unit, and the second PHY unit 12 is a BLE Coded PHY unit.
As an alternative embodiment, the BLE 2M PHY unit processes connection events within [ N _ INT1, (N +1) INT1] time periods; the BLE Coded PHY unit processes the connection event in [ DLY + N INT2, DLY + (N +1) INT2] time periods, N is an integer greater than or equal to 0, INT1 represents a first connection interval, INT2 represents a second connection interval, the initial anchor point is 0 time, DLY represents delay time, and DLY is greater than 0.
In a specific implementation, the first PHY unit 11 includes a first timer 111, and the second PHY unit 12 includes a second timer 121. The first timer and the second timer are used for starting timing at the same time of the initial anchor point, the first timer is used for indicating a target time period for the BLE 2M PHY unit to process the connection event according to a timing value, and the second timer is used for indicating the target time period for the BLE Coded PHY unit to process the connection event according to the timing value.
Referring to fig. 2, when a connection Event1-1 occurs, the first timer and the second timer each start counting at the time when the initial anchor AP is 0. Based on the count value of the first timer, the BLE 2M PHY unit processes the connection Event1-1 during the [0, INT1] period, processes the connection Event1-2 during the [ INT1, 2. INT1] period, processes the connection Event1-3 during the [ 2. INT1, 3. INT1] period, processes the connection Event1-4 during the [ 3. INT1, 4. INT1] period, processes the connection Event1-5 during the [ 4. INT1, 5. INT1] period, and so on. Wherein T denotes a sending operation and R denotes a receiving operation.
Referring to fig. 2, the BLE Coded PHY unit processes a connection Event2-1 within a [ DLY, DLYINT2] period, processes a connection Event2-2 within a [ DLY + INT2, DLY +2 × INT2] period, and so on. Wherein T denotes a sending operation and R denotes a receiving operation. In an alternative embodiment, INT2 is greater than INT 1. In another alternative embodiment, DLY is less than INT 1.
In this embodiment, different PHY units of both BLE lines use different BLE intervals (connection intervals), just like several BLE lines.
Under the normal transmission environment, when data can be transmitted normally, the data is transmitted on different PHY units according to the time sequence. The BLE 2M PHY unit may guarantee a higher transmission rate. In an optional embodiment, to save air interface bandwidth, the BLE 2M PHY unit is configured to transmit a data packet, and the BLE Coded PHY unit is configured to transmit an empty packet.
When a transmission channel is interfered or a transmission distance is increased, the BLE 2M PHY unit and the BLE 1M PHY unit may not transmit data correctly. Assuming that data 1 is not correctly communicated in the connection Event1-1 of the BLE 2M PHY unit, it is retransmitted in the connection Event2-1 of the BLE Coded PHY unit. Because the switching from the BLE 2M PHY unit to the BLE Coded PHY unit is preset, the switching from the BLE 2M PHY unit to the BLE Coded PHY unit may be automatic according to respective timers, without transmitting a BLE PHY Update signal. Therefore, even when the channel condition is poor, stable switching from the BLE 2M PHY unit to the BLE Coded PHY unit can be achieved. Based on the reliability of the BLE Coded PHY unit, data 1 can be correctly communicated in the connection Event2-1 of the BLE Coded PHY unit. New data 2 is then transmitted at Event2 of the BLE 2M PHY; assuming that data 2 cannot be normally transmitted in both connection Event1-2 and connection Event1-3 of the BLE 2M PHY unit; data 2 is retransmitted in a connection Event2-2 of the BLE Code PHY unit; data 2 after the connection Event2-2 of the BLE Code PHY unit communicates normally, new data 3 continues to attempt to transmit in the connection Event1-4 of the BLE 2M PHY unit, and so on for data transmission.
The data transmission system of the BLE link in this embodiment can ensure high transmission efficiency, and can stably realize correct switching of the PHY unit and ensure reliability of data transmission under the condition that a transmission channel is not good.
Example 2
The present embodiment provides a data transmission system for a BLE link. The data transmission system of the BLE link comprises at least 2 PHY units, wherein the at least 2 PHY units take an initial anchor point as a starting point and sequentially process connection events within a preset time period respectively so as to transmit data, and the initial anchor point is the first anchor point of the BLE link.
Referring to fig. 3, the data transmission system of the BLE link of the present embodiment includes a first PHY unit 11, a second PHY unit 12, and a third PHY unit 13. As an alternative embodiment, the first PHY unit 11 is a BLE 2M PHY unit, the second PHY unit 12 is a BLE Coded PHY unit, and the third PHY unit 13 is a BLE 1M PHY unit.
As an alternative embodiment, the first PHY unit 11, the second PHY unit 12, and the third PHY unit 13 have the same connection interval. In specific implementation, the BLE 2M PHY unit processes the connection events in [4 × N × INT, (4 × N +1) × INT ] and [ (4 × N +1) × INT ], (4 × N +2) × INT time periods, the BLE 1M PHY unit processes the connection events in [ (4 × N +2) × INT ], (4 × N +3) × INT time periods, the BLE Coded PHY unit processes the connection events in [ (4N +3) × INT ], (4 × N +4) × INT time periods, N is an integer greater than or equal to 0, the connection intervals are characterized, and the initial anchor point is 0 time.
In specific implementation, the first PHY unit 11 includes a first timer 111, the second PHY unit 12 includes a second timer 121, and the third PHY unit 13 includes a third timer 131; the first timer 111, the second timer 121, and the third timer 131 are configured to start timing at the same time as the initial anchor point, the first timer 111 is configured to indicate a target time period for the BLE 2M PHY unit to process the connection event according to a timing value, the second timer 121 is configured to indicate a target time period for the BLE Coded PHY unit to process the connection event according to a timing value, and the third timer 131 is configured to indicate a target time period for the BLE 1M PHY unit to process the connection event according to a timing value.
Referring to fig. 4, when a connection Event1 occurs, first timer 111, second timer 121, and third timer 131 all start counting at the time when initial anchor AP is 0. Based on the timing value of the first timer 111, the BLE 2M PHY unit processes the connection Event1 within the [0, INT ] period and processes the connection Event2 within the [ INT, 2. INT ] period. Then, based on the timing value of the third timer 131, the BLE 1M PHY unit processes the connection Event3 within the [2 _ INT, 3 _ INT ] period. Next, the timing value of the second timer 121, the BLE Coded PHY unit processes the connection Event4 within the [3 _ INT, 4 _ INT ] period. Then, according to the switching sequence in the [0, 4. INT ] period, the cycle is repeated, and 3 different PHY units process the connection event in turn for data transmission.
Under the normal transmission environment, when data can be transmitted normally, data transmission is performed on different PHY units according to a preset sequence. In an optional embodiment, to save air interface bandwidth, the data packet is sent in a connection event of the BLE 2M PHY unit and a connection event of the BLE 1M PHY unit, and the null packet is sent in a connection event of the BLE Coded PHY unit. This allows a higher transmission rate.
When the transmission channel is interfered or the transmission distance is increased, the BLE 2M PHY unit may not be able to correctly transmit data. Assuming that data 1 is not correctly communicated in the connection Event1 of the BLE 2M PHY unit, retransmission is performed in the connection Event2 of the BLE 2M PHY unit. If the transmission is still not correctly performed, retransmission is performed in the connection Event3 of the BLE 1M PHY unit. If the transmission is still not correctly possible, retransmission is processed in the connection Event4 of the BLE Coded PHY unit. Because the switching from the BLE 1M PHY unit to the BLE Coded PHY unit is preset according to the time node, the switching from the BLE 1M PHY unit to the BLE Coded PHY unit can be automatically switched according to respective timers without transmitting a BLE PHY Update signal. Therefore, even when the channel condition is poor, stable switching from the BLE 1M PHY unit to the BLE Coded PHY unit can be achieved. Based on the reliability of the BLE Coded PHY unit, data 1 can be correctly communicated in the connection Event4 of the BLE Coded PHY unit.
The data transmission system of the BLE link in this embodiment can ensure high transmission efficiency, and can stably realize correct switching of the PHY unit and ensure reliability of data transmission under the condition that a transmission channel is not good.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (8)

1. The data transmission system of the BLE link is characterized by comprising at least 2 PHY units, wherein the at least 2 PHY units take an initial anchor point as a starting point and respectively and sequentially process connection events within a preset time period so as to perform data transmission, and the initial anchor point is a first anchor point of the BLE link;
at least 2 of the PHY units comprise a BLE 2M PHY unit, a BLE Coded PHY unit;
the BLE 2M PHY unit processes the connection event within [ N INT1, (N +1) INT1] time periods; the BLE Coded PHY unit processes the connection event in [ DLY + N INT2, DLY + (N +1) INT2] time periods, N is an integer greater than or equal to 0, INT1 represents a first connection interval, INT2 represents a second connection interval, the initial anchor point is 0 time, DLY represents delay time, and DLY is greater than 0.
2. The data transmission system of a BLE link of claim 1, wherein at least 2 of the PHY units further comprise a BLE 1M PHY unit.
3. The data transmission system of a BLE link of claim 1, wherein INT2 is greater than INT 1.
4. The data transmission system of a BLE link of claim 3, wherein DLY is less than INT 1.
5. The data transmission system of a BLE link of claim 4, wherein the BLE 2M PHY unit is configured to transmit data packets, the BLE Coded PHY unit is configured to transmit null packets; or, the BLE 2M PHY unit is configured to transmit a data packet, and the BLE Coded PHY unit is configured to retransmit the data packet.
6. The data transmission system of a BLE link according to claim 2, wherein said BLE 2M PHY unit processes said connection event within a [4 x N _ INT, (4 x N +1) INT ] and within a [ (4 x N +1) INT ], (4 x N +2) INT ] time period, said BLE 1M PHY unit processes said connection event within a [ (4 x N +2) INT ], (4 x N +3) INT ] time period, said BLE Coded PHY unit processes said connection event within a [ (4 x N +3) INT ], (4N +4) INT ] time period, N being an integer greater than or equal to 0, INT characterizing a connection interval, said initial anchor point being a time instant 0.
7. The data transmission system of a BLE link according to claim 1, wherein the BLE 2M PHY unit comprises a first timer, the BLE Coded PHY unit comprises a second timer, the first timer and the second timer are configured to start timing at the same time as the initial anchor point, the first timer is configured to indicate a target time period for the BLE 2M PHY unit to process the connection event according to a timing value, and the second timer is configured to indicate the target time period for the BLE Coded PHY unit to process the connection event according to a timing value.
8. The data transmission system of a BLE link of claim 2, wherein the BLE 2M PHY unit comprises a first timer, the BLE Coded PHY unit comprises a second timer, and the BLE 1M PHY unit comprises a third timer;
the first timer, the second timer and the third timer are configured to start timing at the same time as the initial anchor point, the first timer is configured to indicate a target time period for the BLE 2M PHY unit to process the connection event according to a timing value, the second timer is configured to indicate a target time period for the BLE Coded PHY unit to process the connection event according to a timing value, and the third timer is configured to indicate a target time period for the BLE 1M PHY unit to process the connection event according to a timing value.
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