KR20080045490A - Method for transmitting messages in the wireless network - Google Patents

Abstract

A method for transmitting a message in a wireless network is provided to transmit a message undefined in communication standards and perform more smooth communication through the transmission of the message. A vender specific request message including predetermined vender identification information and function information configured by the vender is received(44). The vender identification information included in the vender specific request message is confirmed. If a vender is not recognized by confirming the vender identification information, a vender specific response message including error cause code information indicating the recognition result is transmitted to a transmitter of the vender specific request message(45).

Description

How to send messages in a wireless network {Method for transmitting messages in the wireless network}

1 shows an example of a WVAN composed of multiple devices.

FIG. 2 is a diagram for explaining an example of the superframe structure used in the WVAN.

3 is a diagram illustrating a protocol hierarchy implemented in a device of a WVAN.

4 is a view for explaining an embodiment of the present invention.

5A and 5B are flowcharts of procedures in accordance with another embodiment of the present invention.

The present invention relates to a wireless network, and more particularly, to a method for transmitting a message in a wireless network.

Recently, a wireless network between a relatively small number of digital devices in a limited space, such as a home or a small workplace, to exchange audio or video data between the devices, can be a Bluetooth, Wireless Personal Area Network (WPAN). Technology is being developed. WPAN can be used to exchange information between relatively few digital devices at relatively close distances, enabling low power and low cost communication between digital devices.

Performing communication via wireless technology makes it possible to eliminate wires such as cables for connecting the devices. In addition, via wireless network communication between devices, it is possible to exchange data information directly between devices. Devices capable of communicating in the network include computers, PDAs, notebooks, digital TVs, camcorders, digital cameras, printers, microphones, speakers, headsets, bar code readers, displays, mobile phones, and the like. All digital devices can be used. have.

It is common for devices produced by multiple manufacturers in a wireless network to define certain communication specifications in order to perform communications. The communication standard is a promise made by a plurality of devices to transmit and receive data information with each other. The data must be transmitted in a format that meets the specified specifications so that the receiver can understand it and communicate with each other. That is, devices constituting the network may perform communication by transmitting and receiving data according to a defined communication standard. However, the specification cannot be defined in consideration of all situations that may occur when defining the specification for the communication, and a new function may be added later, and there is a unique function that is possible only between specific manufacturers' devices for each manufacturer. In some cases. In this case, there is a problem in that a message not defined in the communication standard cannot be exchanged in a network, and thus data transmission and reception cannot be performed smoothly, and communication thereof cannot be performed, thereby limiting a communication target.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to provide a wireless network communication method that can be performed smooth wireless communication.

In one aspect of the present invention, a method for transmitting a message in a wireless network includes receiving a vendor specific request message including predetermined manufacturer identification information and function information configured by the manufacturer, and the manufacturer specific request. And confirming the manufacturer identification information included in the message.

In another aspect of the present invention, a message transmission method in a wireless network includes transmitting a vendor specific request message including predetermined manufacturer identification information and function information configured by the manufacturer, and the manufacturer specific request message. And receiving a vendor specific response message corresponding to the verification result of the manufacturer identification information included in the verification.

The objects, structures and other features of the present invention described above will become apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are examples in which the technical features of the present invention are applied to a wireless video area network (WVAN), which is a kind of a wireless network. WVAN is a wireless network using wireless HD (WiHD) technology that can provide over 4.5Gbps of throughput for uncompressed transmission of 1080p A / V streams within a 10m range using the 60 GHz frequency band.

1 shows an example of a WVAN composed of multiple devices. The WVAN is a network configured for data exchange between devices located in a predetermined space. The WVAN consists of two or more devices 10-14, one of which acts as a coordinator 10. The coordinator 10 is an apparatus that performs a function of allocating and scheduling the radio resource in order to configure a radio network between the devices so that a plurality of devices share a predetermined radio resource without collision. The coordinator may transmit and receive data through at least one channel as a normal device, in addition to a function of allocating resources so that devices configuring the network can perform communication. In addition, functions such as clock synchronization, network association, and maintaining bandwidth resources may be performed.

WVAN supports two types of physical layers (PHYs). That is, WVAN supports a high-rate physical layer (HRP) and a low-rate physical layer (LRP) as a physical layer. HRP is a physical layer capable of supporting a data rate of 1Gb / s or more, LRP is a physical layer supporting a data rate of several Mb / s. HRP is highly directional and is used for isochronous data streams, asynchronous data, MAC commands and A / V control data transmission over unicast connections. LRP supports directional or omni-directional modes and is used for sending beacons, asynchronous data, and MAC commands including beacons through unicast or broadcast. The HRP channel and the LRP channel share a frequency band and are used separately by the TDM method. HRP uses four channels with 2.0 GHz bandwidth in the 57-66 GHz band, and LRP uses three channels with 92 MHz bandwidth.

FIG. 2 is a diagram for explaining an example of the superframe structure used in the WVAN. Referring to FIG. 2, each superframe includes an area 20 through which a beacon is transmitted, a reserved channel time block 22 and an unreserved channel time block 21. time block). In addition, each channel time block is time-divided into an area where data is transmitted through the HRP (HRP area) and an area where the data is transmitted through the LRP (LRP area). The beacon 20 is periodically transmitted by the coordinator to identify the beginning of every super frame. The beacon includes management and control information of the scheduled timing information WVAN. The device may exchange data in the network through timing information and management / control information included in the beacon. The HRP region may be used for the assigned device to transmit data to another device by allocating channel time according to the channel time allocation request of the device. In addition, although not shown in FIG. 2, a contention-based control period (CBCP) next to the beacon is included to transmit an urgent control / management message. The interval length of the CBCP is set to set a certain threshold (mMAXCBCPLen) so as not to exceed the threshold.

3 is a diagram illustrating a protocol hierarchy implemented in a device of a WVAN. Referring to FIG. 3, a communication module of each device included in a WVAN may be divided into at least two layers according to its function, and generally includes a PHY layer 31 and a MAC layer 30. Is done. The communication module of the device includes an entity managing each layer, the MAC layer management entity (MLME) 300 for the entity for managing the MAC layer, and the PHY layer management entity (PLME) for the entity for managing the PHY layer. It is called (310). The communication module also includes a device management entity (DME) 320 that collects state information of each device and serves as a control interface between the host and the wireless device. Messages exchanged between the different layers are called primitives. The communication module is called a 'modem'.

The present invention relates to a method for transmitting a message not defined in the communication standard as well as a case where a communication standard for data transmission and reception of devices constituting the WVAN is defined. That is, the present invention relates to a method for transmitting and receiving information related to a function provided by a specific manufacturer.

The present invention relates to a method for transmitting a message including manufacturer specific data in a situation in which a message transmission and reception is required according to a manufacturer product (device). The sender that wants to send the message configures a desired message in a predetermined format and transmits the communication to the desired receiver. The message format transmitted by the sender may be in a form promised in advance so that the receiver may transmit an action or response message corresponding to the message understood and transmitted according to a predetermined condition.

An example of the MAC command format included in the manufacturer specific request message is shown in Table 1 below.

Octects: 3 One n Vender OUI Data Length = n Vender Specific Data

Referring to Table 1, specific identifier information allocated to each vendor is transmitted through the 'Vender Organizationally Unique Identifier' field. The device receiving the manufacturer specific request message may distinguish the corresponding manufacturer from among a plurality of manufacturers through the Vender OUI field. When the device that receives the command message does not know the Vender OUI field information, the message may be ignored or a response message including information indicating that the Vender OUI field information is not known may be transmitted. In addition, an error information message including the same information as the response message may be configured and transmitted. If the manufacturer identifier information included in the Vender OUI field is known, the information included in the command may be read, interpreted, and the corresponding response message may be transmitted.

In addition, information on the length of the 'Vender Specific Data' field to be described below is transmitted through the 'Data Length' field. That is, when data of n Octects is transmitted through the 'Vender Specific Data' field, information corresponding to 'n' is transmitted in the Data Length field.

Finally, the specific content of the message not defined in the communication standard is transmitted through the 'Vender Specific Data' field. That is, the Vender Specific Data field information is defined by the manufacturer of the transmitting device of the command message of Table 1. Information defined by the manufacturer is referred to as vendor specific data configured by the manufacturer. If the transmitting side intends to transmit data in a format not defined in the communication standard, the MAC command format shown in Table 1 is used, but the Vender Specific Data field is configured to include function information configured by a desired manufacturer.

Examples of function information configured by the above manufacturers include debugging, vendor specific service discovery, device management, provisioning service, and network setup. Messages for performing such operations.

In the case of debugging, when debugging is performed only for devices manufactured by a specific manufacturer, if the manufacturer-specific command is used, the debugging message can be checked and debug only for devices that can recognize the Vender OUI field. It is possible. In addition, in the case of vendor specific service discovery, the command may be used to check whether the service can be provided before providing a service provided only by the specific manufacturer (for example, turbo mode). have. Similarly, in the case of device management, when a device is to be managed using a command, the specific manufacturer device may be distinguished and managed.

Table 2 shows another example of the MAC command format included in the manufacturer specific request message that can be used when a message not defined in the communication standard is to be transmitted.

Octects: 3 One One n Vender OUI VSP Type Data length Vendor specific data

Referring to Table 2, the 'Vender OUI', 'Data Length' and 'Vender Specific Data' fields mean the same as those included in Table 1 above. The command format of Table 2 further includes a 'VSP Type' field. The VSP (Vender Specific Parameter) Type field includes information about a type of a function configured by a manufacturer defined by the vendor and is transmitted. That is, the device receiving the command of Table 2 may transmit a response message to the message in consideration of the type of the VSP as well as the specific ID of the manufacturer.

Table 3 below shows an example of an information element (IE) format included in the manufacturer specific message.

Octects: One 3 n IE index IE length Vender OUI Vender specific parameter

Referring to Table 3, 'Vender OUI' is the same as described through Table 1 above. That is, the receiving device may identify a specific manufacturer through the 'Vender OUI' field. In addition, the 'Vender specific Parameter' field is a field in which information corresponding to 'Vender specific Data' field information of Table 1 is transmitted, and the Vender specific Parameter field information is configured by a manufacturer defined by the manufacturer of the device of the transmitting side of the message. Information about the function is configured in the format defined by the manufacturer.

In addition, the IE when the 'VSP Type' field is further included as in the case of Table 2 may be configured as shown in Table 4 below.

Octects: One 3 One n IE index IE length Vender OUI VSP Type Vender specific parameter

Description of each field shown in Table 4 is the same as described through Tables 1 to 3 above, and will be omitted.

The device receiving the manufacturer specific request message transmitted using the MAC command and the IE format determines whether the manufacturer can be recognized by checking the contents of the received message, and if the manufacturer is unknown, the manufacturer specific request. You can ignore the message. In the case of using the method for ignoring the request message, the sender of the request message should wait for a predetermined time for the request result, and also have a system for timer operation to check the predetermined time.

In another embodiment, when the device that receives the manufacturer specific request message cannot recognize the manufacturer, the device transmits a response message including information about the manufacturer. In this case, since the response message to the request message is transmitted immediately, the process of waiting for a predetermined time is unnecessary at the transmitting side of the request message, thereby saving time. In addition, even when the manufacturer is known, the response message may be transmitted according to the contents of the manufacturer specific request message transmitted, including response information on function information configured by the manufacturer delivered through the message. Hereinafter, the response message transmitted by the device that receives the manufacturer specific request message is called a 'vender specific response' message. Table 5 shows an example of the MAC command format included in the manufacturer specific response message.

Octects: 3 One One Vender OUI Data length Error reason code

Referring to Table 5, 'Vender OUI' and 'Data length' fields are the same as shown in Table 1. More specific error cause information on the error is transmitted through the 'Error reason code' field of the manufacturer specific response message. In other words, it is assumed that some cases, such as the case of not recognizing the manufacturer-specific identifier of the transmitted manufacturer-specific message or the manufacturer's VSP type, may be defined. do. The error reason code defined for the case can be included in the Error reason code field to transmit a more specific error condition.

Even when the error is received without error, the manufacturer specific response message may be transmitted by including response information on the function information content configured by the manufacturer included in the manufacturer specific request message in the Error reason code field. That is, the information indicating the success or failure of the function information configured by the received manufacturer is defined as a specific code, and the defined code is inserted into the Error reason code field and transmitted.

For example, an error reason code for not recognizing a manufacturer-specific identifier is designated as '0x00', and an error reason code for not recognizing a manufacturer's VSP type is designated as '0x01'. When requesting response information from the manufacturer specific request message, the response information for the function information configured by the manufacturer is designated as at least one other code. For each case, the designated code is selected, inserted into the Error reason code field, and transmitted.

In another embodiment, when the receiving device cannot recognize the manufacturer identifier through the vendor OUI field by receiving the manufacturer specific request message, an error information message may be transmitted. Table 6 below shows an example of the error information message format.

Octects: 1 One 6 One One IE index IE length Request MAC address Request sequence number Error reason code

Referring to Table 6, information on the MAC address of the device transmitting the received message is transmitted through the 'Request MAC address' field. The MAC sequence number for the received message is transmitted through the 'Request sequence number' field. That is, in case of receiving a plurality of messages, in order to distinguish which message is an error information message, the message includes a sequence number included in the header of the received message and transmitted. More specific information about the error is transmitted through the 'Error reason code' field. Description of the 'Error reason code' field is the same as the description of the 'Error reason code' field of Table 5.

The error information message of Table 6 indicates that the delivery of the request message failed not only when the manufacturer-specific message is received but also when a device receiving another request message cannot perform or recognize a function corresponding to the request. Can be used to inform. If the error message of Table 6 can be transmitted including the above information, the existing information element format can be used without newly defining it. For example, the existing information element format may be used by adding code information indicating that an error information message is added to code information included in the field by using a predetermined field of one of the existing IE formats.

Hereinafter, a method of transmitting and receiving data through the manufacturer specific message will be described through embodiments.

4 is a view for explaining an embodiment of the present invention. Hereinafter, a method of checking a memory using a debug message format of a specific manufacturer will be described as an example of using the manufacturer specific message with reference to FIG. 4.

In the communication module 40 manufactured by A manufacturer, the network including the communication module includes identification information corresponding to 'A', which is its own information, and information on function information configured by the manufacturer for identifying the memory. Broadcast or transmit a manufacturer specific request message (VS message) (44). The meaning of the broadcast is one of a message transmission scheme that can be received by a device included in the network without a specific receiver. Table 7 below shows an example of a manufacturer specific message IE format configured for use when performing a memory check.

Octects: 1 One 2 One IE index Length Vender OUI = A Memory usage (%)

Referring to Table 7, as described in Table 3 above, the code corresponding to identification information corresponding to 'A', which is the company's information, is inserted into the Vender OUI field and transmitted. Although not defined in the communication standard, the Vender specific Parameter field transmits a message to be transmitted, that is, information on a function configured by the manufacturer. In other words, in the present embodiment, the function information configured by the manufacturer is a message for requesting memory confirmation. The devices receiving the message of Table 7 check the Vender OUI field and determine whether the manufacturer transmitted through the Vender OUI field can be recognized. If it is possible to recognize the manufacturer as a result of the check, the contents of the function information configured by the manufacturer transmitted through the Vender Specific Parameter field are checked to transmit a response message for the function information configured by the manufacturer (45). If, as a result of the verification, the manufacturer can be recognized or there is another error (failure), the manufacturer-specific response message described through Table 5 is transmitted, but the code '0x00' is inserted into the error reason code field of the response message. Can be sent or configured as an error information message described in Table 6. Since the memory status can be identified by distinguishing the corresponding device devices through the manufacturer specific message, there is an advantage in that systematic management for each manufacturer product is possible.

5A and 5B are flowcharts of procedures in accordance with another embodiment of the present invention. 5A and 5B, a method of checking whether a turbo mode operation is possible through a manufacturer specific message will be described.

It is assumed that some or all of the devices manufactured by the manufacturer A are capable of executing their own developed transmission mode (for example, turbo mode), and the turbo mode is not defined in the WVAN communication standard. When the first device wants to transmit / receive data in the turbo mode with the second device, it is determined whether the second device can provide the turbo mode and then attempts to connect the turbo mode. However, since the turbo mode is not defined in the communication standard, a message for confirming whether the turbo mode is possible cannot be transmitted. In such a case, a message for confirming whether the turbo mode is possible may be transmitted using a manufacturer-specific message provided in the present invention.

Referring to FIG. 5A, a first device uses a MAC command of Table 1 or Table 2 and an IE format of Table 3 or Table 4 as the second device, and is configured by a manufacturer for checking whether the turbo mode is possible. It transmits including the function information (S50). Table 8 shows an example of an IE format that can be used in this embodiment.

Octects: 1 One 2 One IE index Length Vender OUI = A 0x02 (Do you support Turbo mode?)

Referring to Table 8, the Vender OUI field includes information about the manufacturer 'A', and transmits the information including the function information configured by the manufacturer to determine whether the turbo mode is available. In the case of the present embodiment, the function information configured by the manufacturer includes information indicating that the turbo mode is checked and information indicating whether the turbo mode is possible.

The second device receiving the message confirms the message. If the second device can recognize the manufacturer by checking the Vender OUI field information of the received message, it can transmit a response message to the message (S51). The response message includes information on whether turbo mode is available. For example, when turbo mode transmission is possible, a code indicating success is designated as '0x01', and when a turbo mode transmission is not possible, a code indicating failure is designated as '0x02'. The second device inserts and transmits the 0x01 code when the turbo mode transmission is possible, and transmits by inserting the 0x02 code when the turbo mode transmission is not possible. The first device receiving the response message transmitted by the second device attempts to connect for turbo mode transmission when a code (0x01) indicating success is transmitted (S52). However, when a code (0x02) indicating failure is transmitted, a connection for normal mode transmission may be attempted.

Referring to FIG. 5B, as shown in FIG. 5A, a first device transmits a message including function information configured by a manufacturer for checking whether the turbo mode is available (S53), and the second device that receives the message includes the function information. Check. If the second device cannot recognize the manufacturer by checking the Vender OUI field information of the received message, as described through Table 5, an error reason code of '0x00' is inserted into the Error Reason code field to transmit a manufacturer-specific response message. Or transmit the error information message described in Table 6 (S54). The error information message includes information indicating that the manufacturer cannot be recognized and transmitted. Since the first device that has received the error information message cannot perform turbo mode transmission, it may attempt to connect for normal mode transmission (S55).

That is, a manufacturer-specific message may be used to transmit a message to confirm a function not defined in the communication standard as described above. In addition to the above-described embodiments, a message configured for each manufacturer may be transmitted using the manufacturer-specific message in various situations.

The terms used above may be replaced with others. For example, the manufacturer may be changed to a vendor, manufacturer, producer producer, etc., the device may be changed to a user device (or device), a station, etc., and the coordinator may be adjusted (or controlled). It will be apparent to those skilled in the art that the device may be changed to an apparatus, a coordinating (or controlling) device, a coordinating (or controlling) station, a coordinator, a piconet coordinator, or the like.

Those skilled in the art to which the present invention described above belongs will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the embodiments described above are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the above description, and it is to be construed that all changes or modifications derived from the meaning and scope of the claims and the same concept are included in the scope of the present invention. will be.

According to the present invention, there is an effect that it is possible to transmit a message that is not defined in the communication standard. In addition, there is an effect that can communicate more smoothly through the transmission of the message.

Claims (8)

In the message transmission method in a wireless network, Receiving a vendor specific request message including predetermined manufacturer identification information and function information configured by the manufacturer; And Checking manufacturer identification information included in the manufacturer specific request message; Message transmission method comprising a. The method of claim 1, If the manufacturer identification information is not recognized and recognized, a vendor specific response message including a error cause code information indicating that the manufacturer identification information cannot be recognized is sent to the transmitting side of the manufacturer specific request message. The message transmission method further comprises the step of transmitting. The method of claim 1, The method may further include transmitting an error information message including error reason code information indicating that the manufacturer identification information cannot be recognized if the manufacturer identification information is not recognized. Message transmission method. The method of claim 1, Checking function information configured by the manufacturer when the manufacturer identification information is recognized and recognized; And Transmitting a vendor specific response message including a response information corresponding to the function information configured by the manufacturer to a transmitting side of the manufacturer specific request message; Message exchange method further comprises. The method of claim 1, The function information configured by the manufacturer may be used to perform debugging, vendor specific service discovery, device management, provisioning service, network setup, and the like. Message transmission method, characterized in that one of the information for. In the message transmission method in a wireless network, Transmitting a vendor specific request message including predetermined manufacturer identification information and function information configured by the manufacturer; And Receiving a vendor specific response message including information corresponding to the result of checking the manufacturer identification information included in the manufacturer specific request message Message transmission method comprising a. The method of claim 6, The manufacturer specific response message may include error reason code information indicating that the manufacturer identification information cannot be recognized. The method of claim 6, The manufacturer specific response message may include code information indicating a response to the function information configured by the manufacturer.

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