KR100365157B1 - Method for transmitting remote control information by FHS packet in bluetooth - Google Patents

Abstract

The present invention relates to a method of transmitting information using FHS packets in Bluetooth, and more particularly, to a method of delivering remote control information using FHS packets in Bluetooth, which provides an appropriate packet structure of remote control information rather than general data transmission and provides an improved protocol structure. It is about.

The present invention provides a method for delivering remote control information using FHS packets in Bluetooth that can provide an appropriate packet structure of remote control information rather than general data transmission and can provide an improved protocol structure.

According to the present invention, it is possible to provide an appropriate packet structure of remote control information other than general data transmission and to provide an improved protocol structure.

Description

Method for transmitting remote control information by FHS packet in bluetooth}

The present invention relates to a method of transmitting information using FHS packets in Bluetooth, and more particularly, to a method of delivering remote control information using FHS packets in Bluetooth, which provides an appropriate packet structure of remote control information rather than general data transmission and provides an improved protocol structure. It is about.

In general, with the development of wireless communication technology, Bluetooth (Bluetooth) using a wireless communication method is also used for security. Bluetooth is a technology specification that wirelessly connects portable devices such as portable PCs and mobile phones within a narrow range at low cost. It uses radio frequency to exchange voice and data without physical cable for communication between various digital devices.

For example, if Bluetooth technology is implemented in mobile phones and laptops, you no longer need to use the cable you currently use to connect your phone and laptop. Virtually all digital devices, including printers, desktops, fax machines, keyboards and joysticks, can be part of a Bluetooth system.

Bluetooth was launched as an open standard when five companies, Ericsson, Nokia, Intel, Toshiba and IBM, formed a consortium called the Bluetooth Special Interest Group (SIG) in 1998. Since then, Lucent Technologies, Motorola, Microsoft, and 3Com have joined the Special Interest Group (SIG), with 1790 members worldwide (2000.4.20). This number is on the rise, and Bluetooth is now becoming a global standard for short-range wireless communications.

In describing the specifications and characteristics of Bluetooth, the Bluetooth Radio module provides a maximum transmission rate of 1Mbps using 2.4GHz Industrial Scientific Medical (ISM). In order to reduce the influence of interference, a frequency hop transceiver technique is used, and a modulation scheme uses a binary FM scheme.

As the main function of the Bluetooth protocol, the baseband module carries the baseband protocol, provides routing function with the low-level link of the remote device, and the Link Manager Protocol (LMP) provides link setup, etc. L2CAP (Logical link Control and Adaptation Protocol) module provides upper layer protocol multiplexing, packet fragment reassembly, and quality of service (QoS). RFCOMM is also an upper layer of L2CAP and provides the ability to transmit data from the application layer.

Bluetooth is a protocol that provides short-range wireless links between electronic devices in homes and offices (10m radius), proposed by Ericsson, Toshiba, Nokia, IBM, and Intel. An ad hoc network between mobile, stationary and mobile devices to transfer files, dial up networking, sync, 3 in 1 phone, ultimate handset, computer speaker phone, cordless computer and conference table ( Conference table).

Therefore, Bluetooth is settled in devices such as printers, PDAs, desktop PCs, fax machines, keyboards and joysticks to provide voice and non-voice services wirelessly.

The wireless access technology provided by Bluetooth is based on Ad hoc network and provides data service using TCP / IP and interface functions such as Host Interface Device (HID), Object Exchange Protocol (OBEX) and audio in Piconet environment. to provide. In order to provide a stable link in a noisy environment, Bluetooth Radio provides a fast sensing and frequency hopping method for the environment.

In addition, compared to other systems using the same frequency band, it has the advantage of quickly hopping to a new frequency and using small packets, thereby excluding interference by other signals as much as possible. In particular, the Bluetooth Radio can reduce the effects of random noise generated in a long-distance link environment through FEC (Forward Error Correction) for error recovery.

Bluetooth transmission provides a full-duplex method in which circuit and packet switching modes are mixed based on time division duplex (TDD). Packets used in Bluetooth generally use one TDD slot, but can be extended to five slots.

The following shows the characteristics of the TDD slot, which provides synchronous and asynchronous channels, provides one asynchronous data channel and up to three synchronous voice channels, and supports 64 kb / s of synchronous voice channels. kb / s, up to 432.6 kb / s for symmetrical links, and up to 721 kb / s in any direction.

1 is a block diagram of a conventional Bluetooth, the configuration is composed of a host controller 10, a host controller interface 20, a host 30, the application 40. Bluetooth is a wireless interface technology for connecting peripherals. It replaces the existing wired interface RS-232C, USB, etc., and enables data transmission wirelessly, and at the speed of up to 1Mbps in the 1.0b standard (approximately 10Mbps in the currently working 2.0 standard) is possible. .

The Bluetooth device is composed of a Host Controller (10) module, a Host (30) module, and a Host Controller Interface (20) for connecting the two. In addition, each profile (Profile) ), An application or control module is required.

The host controller 10 module corresponds to a submodule that fits a physical part and control thereof, and includes a baseband module including a link management module, a link controller, and the like. And RF modules.

Host (30) module mainly corresponds to the upper layer for communication, L2CAP (Logical Link Control and Application Protocol), which is responsible for data link control and segmentation and reassembly, multiplexing of data It consists of RFCOMM, which is in charge of lexing, and SDP (Service Discovery Protocol), which is responsible for inquiring services of nearby Bluetooth devices.

2 is a flowchart illustrating a control information transmission method using an FHS packet in a conventional Bluetooth.

Connecting to the host controller 10 with an inquiry (S11); Connecting to the host controller (10) by paging after the query (S12); After connecting to the host controller 10 performs a step of performing a higher protocol connection to the L2CAP, RFCOMM (S13).

3 is a state transition diagram of FIG. 2.

This includes a standby state and a page scan state.

4 is a structural diagram of the FHS packet payload of FIG.

The packet is composed of a DAC (Device Access Code) or an IAC (Inquiry Access Code) in the IP packet, and the receiver receives the packet and calculates it with a bit correlator to synchronize. The DAC is used for paging / paging response and the like, and the IAC is used for inquiry procedure.

Frequency Hop Synchronization (FHS) packet informs the address and clock information of the transmitting Bluetooth device. Through this packet, the receiving Bluetooth device can synchronize with the clock of the transmitting Bluetooth device and make a connection. In addition, the FHS packet includes information such as a temporary address of a receiving Bluetooth device in a pico net configured by a transmitting Bluetooth device after connection. The Slave's FHS packet, which is sent in response to an inquiry, includes a field indicating a period in which the receiving Bluetooth device checks whether a paging request exists.

In the conventional Bluetooth technology, data transmission is performed after the connection of the host controller 10 level through Inquiry, Paging, L2CAP, RFCOMM, and the connection of the user application are performed.

Inquiry is a procedure for checking whether there is any other Bluetooth device around and obtaining setting values for wireless connection such as clock offset or scan setting of the counterpart device. The master transmits the ID packet of the master to the slave to perform the query command, and the slave transmits the FHS packet to the master in response to the processing of the query command.

Here, the Master is a Bluetooth device that initiates communication, and the Slave is a Bluetooth device that responds to it.

Paging is a procedure where the actual connection is performed at the baseband level. The master transmits the slave's ID packet to the slave to perform the paging command, and the slave transmits the slave's ID packet to the master in response. When the FHS packet is transmitted from the master to the slave, the ID packet of the slave is transmitted from the slave to the master. As a result, traffic is established between the master and the slave to perform paging.

After the higher protocol connection procedure, the request and response for the connection is performed by L2CAP, and the request and response for the configuration is performed. In addition, connection request / response by RFCOMM is performed. RFCOMM is not always used, and there may be an adaptation layer on top of RFCOMM.

According to the conventional Bluetooth standard, the host controller level is connected after going through the procedure of Inquiry, Paging, etc., and user data after connection of necessary higher protocols is completed in order according to the application. Can be transmitted.

However, such a conventional signaling process is suitable when there is a large amount of data to be transmitted or a long connection time, but controls a Bluetooth-equipped home device (TV, air conditioner, etc.) that does not transmit a large amount of data. In this case, if only the purpose of transmitting the on, off signal, or simple control information, such as a PC or a printer, there is a problem that it may be an unnecessary load in time or power consumption. In addition, in the case of only a simple control information transmission, there is a problem that it is necessary to repeat the connection and disconnection, or the mode switch because of the constraint that the connection to several devices can be maintained at the same time by maintaining the connection with several devices.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and provides a proper packet structure of remote control information, rather than general data transmission, and remote control information transmission method using FHS packets in Bluetooth that can provide an improved protocol structure. To provide that purpose.

1 is a block diagram of a typical Bluetooth.

2 is a flow chart of a control information transmission method using an FHS packet in a conventional Bluetooth.

3 is a state transition diagram of FIG.

4 is a structural diagram of the FHS packet payload of FIG.

5 is a flowchart of a method for transmitting remote control information using an FHS packet in Bluetooth according to the present invention;

6 is a detailed flow chart of the third step.

7 is a state transition diagram of FIG. 6.

FIG. 8 is a diagram illustrating a structure of an FHS packet payload showing a remote control information transfer mode display in FIG. 5; FIG.

FIG. 9 is a diagram illustrating an FHS packet payload structure showing scan periods and temporary address allocation in FIG. 5; FIG.

FIG. 10 is a structure diagram of an FHS packet payload showing remote control information transmission in FIG.

<Explanation of symbols for the main parts of the drawings>

10: host controller 20: interface

30: host 40: application

In order to achieve the above object, the present invention provides a first process of configuring a state of a Bluetooth link controller by setting a page scan mode, a clock, and AM_ADDR in FHS, and a second process of connecting to a host controller by a query after the first process. And a remote information state after the second process.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

5 is a flowchart illustrating a method for transmitting remote control information using an FHS packet in Bluetooth according to the present invention.

As shown therein, a first step (S21) of configuring a state of the Bluetooth link controller by setting a page scan mode, a clock CLK, and AM_ADDR in the FHS; A second step (S22) of connecting to a host controller (10) with Inquiry after the first step; And a third step S23 of connecting to the host controller 10 by paging including a remote information state after the second step.

In addition, S24 is a step of performing a higher protocol connection to L2CAP, RFCOMM.

In the first step, when the remote control information transfer mode is displayed in paging, the packet payload is configured in the FHS including AM_ADDR, clock (CLK), and remote information mode.

In the first step, the FHS includes a remote info address assignment, a remote info scan period, and a remote info mode when a scan period and a temporary address are allocated in paging. Configure the packet payload.

In the first step, the FHS comprises a packet payload including a remote information address, a remote control information, and a remote information mode.

6 is a detailed flowchart of the third step.

As shown therein, a step of determining whether the remote information mode is detected after scanning a page in a standby state (S31 to S33); If the remote information mode is detected, the remote information is set and received, followed by scanning the remote information (S34 to S37).

7 is a state transition diagram of FIG. 6.

As shown therein, a standby state, a page scan state, a remote information setting state, a remote information standby state, and a remote information scan state are set; When the timeout occurs in the standby state, the device transitions to the page scan state. When no signal is detected in the page scan state, the device transitions to the standby state. When the remote information mode is detected in the page scan state, the device transitions to the remote information setting state. When the remote information setting is received in the remote information setting state, the remote information standby state transitions to the remote information standby state. When the remote information standby state times out, the remote information setting state transitions to the remote information scan state, and the remote information is stored in the remote information scanning state. When received, the transition to the remote information standby state.

FIG. 8 is a diagram illustrating a structure of a FHS packet payload showing a remote control information transmission mode in FIG. 5, and FIG. 9 is a diagram illustrating a structure of a FHS packet payload showing a scan period and a temporary address assignment in FIG. 5, and FIG. FHS packet payload structure showing information delivery.

The operation of the remote control information transmission method using the FHS packet in the Bluetooth according to the present invention configured as described above will be described in detail.

First, in the present invention, the fields of the FHS packet used in the conventional inquiry or paging are used, and the state is periodically scanned by remote control information by recognizing them. Change the state diagram of the Bluetooth link controller to enter.

Among field information of the FHS packet proposed by the present invention, those used differently from fields of the conventional FHS packet are as follows. The page scan mode is originally intended to indicate which of the methods for generating the hop frequency used for paging is used, but here, the remote control information scan mode is referred to periodically as the remote control information scan mode. Used to request a slave to give.

The clock is primarily intended to send the clock information of the master. When the FHS packet is sent for the first time, the clock information is entered as it is, but the second time period indicates the cycle for the slave to enter the remote control information scan state. Later, remote control information is sent in this field. This is 26 bits, which is enough to transmit simple control information.

AM_ADDR has conventionally been used to assign temporary addresses to each master to manage slaves associated with it. In the FHS packet according to the present invention, it is used to distinguish remotely controlled devices.

Meanwhile, the operation of the present invention will be described in detail with reference to the accompanying drawings.

Inquiry is the same as the conventional operation.

Paging recognizes that when the slave enters the page scan state, it receives its ID packet from the master and synchronizes it, and then the slave receives the master's FHS packet and does not end with the paging procedure. It consists of steps.

When performing paging, the master transmits the slave's ID packet to the slave to perform the paging command, and the slave transmits the slave's ID packet to the master. In addition, the FHS packet indicating the remote control information transfer mode is transmitted from the master to the slave. The slave then sends the slave's ID packet to the master.

In addition, when the FHS packet including the remote information address assignment and the remote information scan period is transmitted from the master to the slave to the slave, the slave checks the remote information scan period on the slave side and transmits the FHS packet including the confirmed information to the master. .

Remote Control Information Transfer requires the slave to periodically enter the remote control information scan state to scan for the request in order for the slave to receive remote control information through the FHS packet from the master. At this time, you can quickly synchronize the remote information scan period and the clock information of the master. When the FHS packet including the remote control information is transmitted from the master to the slave, the slave checks the remote control information and transmits the FHS packet including the confirmed information to the master.

As described above, the present invention provides an appropriate packet structure of remote control information rather than general data transmission and provides an improved protocol structure.

According to the present invention, it is possible to provide an appropriate packet structure of remote control information rather than general data transmission and to provide an improved protocol structure.

In addition, a peripheral device having a Bluetooth device added to the link controller of the present invention may have an effect of receiving and processing information received through a conventional remote controller. For example, you can turn on / off the TV, adjust the volume, and play it. This makes it possible to control electronic devices in the home (or office) with one Bluetooth device such as a mobile phone.

In addition, when the home networking is established through Bluetooth, the present invention improves the current Bluetooth system in which data transmission is possible only when the connection to the user application level is established, and thus, the time required for connection by transferring simple control information at a lower level. And greatly reduce the signaling transmitted.

Furthermore, the system can be constructed without any effect on the paging step as a preliminary procedure for transmitting a large amount of user data through the existing upper protocol connection. For example, in the case of a Bluetooth device that does not implement the remote control information transfer mode, even if the FHS Packet is received, the value of the page scan mode field can be simply ignored because it is not supported by the device. It is convenient to connect and transmit as user data.

Claims (6)

A first step of configuring a state of the Bluetooth link controller by setting a page scan mode, a clock, and AM_ADDR in the FHS; A second step of connecting to a host controller with a query after the first step; And a third process of connecting to the host controller by paging including a remote information state after the second process. The method of claim 1, wherein the first process comprises: The remote control information transmission method using FHS packets in Bluetooth, characterized in that the FHS packet payload including AM_ADDR, clock, remote information mode when displaying the remote control information transmission mode in paging. The method of claim 1, wherein the first process comprises: A method of transmitting remote control information using FHS packets in Bluetooth, comprising configuring a packet payload of the FHS including a remote information address allocation, a remote information scan cycle, and a remote information mode when a scan period and a temporary address are allocated in paging. The method of claim 1, wherein the first process comprises: Remote control information transmission method using the FHS packet in Bluetooth, characterized in that for configuring the FHS packet payload including the remote information address, remote control information, remote information mode. The method of claim 1, wherein the third process comprises: Determining whether the remote information mode is detected after scanning a page in a standby state; And if the remote information mode is detected, receiving and setting remote information, and then scanning the remote information. The method of claim 1, wherein the state is Set to a standby state, a page scan state, a remote information setting state, a remote information standby state, and a remote information scan state; When the timeout occurs in the standby state, the device transitions to the page scan state, and when no signal is detected in the pagescan state, it transitions to the standby state, and when the remote information mode is detected in the pagescan state, it transitions to the remote information setting state. When the remote information setting is received in the remote information setting state, the remote information standby state transitions to the remote information standby state. When the remote information standby state times out, the remote information setting state transitions to the remote information scan state, and the remote information is stored in the remote information scanning state. The remote control information transmission method using the FHS packet in Bluetooth, characterized in that the transition to the remote information standby state when received.