KR20070021136A - Method for wireless data transfer - Google Patents

Abstract

Method of wireless data transfer between a first multimedia device (CAMC) and a second multimedia device (TV)-The first multimedia device (CAMC) and the second multimedia device (TV) may be a first wireless standard (BT) or a second wireless standard ( Connected via a wireless connection operating according to IEEE 802.11b, and the first and second wireless standards BT and IEEE 802.11b are different or incompatible with each other; A selection step in which a second wireless standard (IEEE 802.11b) is selected as the selected wireless standard, a processed connection command (IEEE 802.11b-CC) of the selected wireless standard (IEEE 802.11b; 802.11a; BT), a processed connection parameter Connection command (BT-CC), connection parameter (BT-CP) and / or connection data (BT-CD) to obtain (IEEE 802.11b-CP) and / or processed connection data (IEEE 802.11b-CD). Layer processing step is processed, and the processed connection command (IEEE 802.11b-CC), the processed connection parameters (IEEE 80) 2.11b-CP) and / or processed connection data (IEEE 802.11b-CD) transmit power over the wireless connection (IEEE 802.11b-WC) according to the selected wireless standard (IEEE 802.11b; 802.11a; BT) And a transmitting step. Therefore, the method enables seamless switching from one wireless standard to another, and the upper layers are not aware of the switching.

 Wireless Data Delivery, Bluetooth, IEEE 802.11b, Multimedia Devices, Integrity Switching

Description

Wireless data delivery method {METHOD FOR WIRELESS DATA TRANSFER}

The present invention relates to a method of wireless data transfer between a first multimedia device and a second multimedia device, and a multimedia device having a wireless connection with an additional multimedia device.

Other standards exist for wireless data transfer between multimedia devices. Examples of wireless standards are ultra wide band (UWB), Bluetooth, IEEE 802.11a and IEEE 802.11b. Each of these standards has some advantages and disadvantages associated with several aspects such as, for example, power consumption, range, and bit rate (see FIG. 1). For example, the power consumption of the Bluetooth standard is low, but its bit rate and range is rather small. In comparison, the bit rate of the IEEE 802.11a standard is rather high over a wider range and higher power consumption. When using current methods for wireless data delivery, the method may not optimally use the available resources.

In addition, when using current methods for wireless data transfer, when the standard of the wireless connection is switched to another wireless standard, the wireless connection between different media devices is often interrupted. For example, if the application of a multimedia device has a Bluetooth connection with the multimedia device and the standard of the wireless connection should be switched from the Bluetooth standard to the IEEE 802.11b standard, the Bluetooth connection is typically interrupted and after the interruption of the Bluetooth connection. A new connection in accordance with the IEEE 802.11b standard is established. After establishment of an IEEE 802.11b connection, data delivery may continue. However, this has the disadvantage that the user may experience a sharp drop in quality of service, for example with respect to bit rate and jitter, due to the interruption of the existing connection and the establishment of a new connection.

It is an object of the present invention to provide a wireless data transfer method that allows seamless switching between different wireless standards without blocking the ongoing data stream. It is a further object of the present invention to provide a multimedia device that enables seamless switching between different wireless standards without blocking the ongoing data stream.

In order to achieve this object, the present invention provides a wireless data transfer method according to claim 1. In addition, the present invention provides a wireless data delivery system, a computer program product, a computer readable storage medium and a multimedia device as defined in claims 16, 17, 18 and 19, respectively. Further features and preferred embodiments are defined in each dependent claim and / or in the following description, respectively.

Wireless data transfer method between a first multimedia device and a second multimedia device, wherein the first multimedia device and the second multimedia device are connected through a wireless connection operated according to a first wireless standard or a second wireless standard, and the first wireless standard And the second wireless standard is different or incompatible with each other.

An application data reception step in which application instructions, application parameters, and / or application data of the first wireless standard are received from an application of the first multimedia device.

An access layer processing step in which said application command, application parameter and / or application data is processed to obtain each connection command, connection parameter and / or connection data of said first wireless standard. For example, if the application is an Internet application, the access layer processing step provides all the steps according to Transmission Control Protocol (TCP). This means that in this example, the connection command, connection parameter and / or connection data are TCP data. Connection commands, connection parameters and connection data may be, for example, user datagram protocol (UDP) data, Bluetooth data or ZigBee. Note that everything above the connection layer is an application in terms of the scope of the "application", ie the application layer (processing step) and the "connection", ie the connection layer (processing step). For example, in an operating system, the connection layer is typically part of the operating system and requires a driver, whereas the application is typically software, which can be purchased, for example, in a store. Typically, an application utilizes the connection layer through a function call, for example, "Operating system, please establish a Bluetooth connection to device B."

A selection step in which the first wireless standard (BT) or the second wireless standard (IEEE 802.11b) is selected as the selected wireless standard.

An adaptation layer processing step in which the connection command, the connection parameters and / or the connection data are processed, to obtain the processed connection command, the processed connection parameters and / or the processed connection data of the selected radio standard. In particular, if the selected radio standard is different from the first radio standard within the adaptive layer processing step, standard conversion is performed. This means, for example, that the connection commands, connection parameters and / or low speed data of the application radio standard are converted into respective processed connection commands, processed connection parameters and processed connection data of the selected radio standard. Therefore, one connect command can be converted into one or several processed connect commands. It is also possible for several connect commands to be converted into only one processed connect command. The same applies to the connection parameters and the connection data. This means that the processing in the adaptive layer processing step changes the packet size of the connection data with respect to the packet size of the processed connection data. In addition, the command set of the connect command may be converted into each command set of the processed connect command according to the selected wireless standard. In a typical usage scenario of the present invention, the first wireless standard has, for example, a Bluetooth standard, ie the application has a Bluetooth connection with each Bluetooth handle. However, the selected wireless standard may be an IEEE 802.11b standard. However, within the adaptive layer processing step, Bluetooth connection command, Bluetooth connection parameter and / or Bluetooth connection data are converted or processed to obtain IEEE 802.11b connection command, IEEE 802.11b connection parameter and / or IEEE 802.11b connection data. .

A transmission step in which the processed connection command, the processed connection parameters and / or the processed connection data are transmitted and output via the wireless connection according to the selected wireless standard. In this example, this is achieved by transmitting and outputting each IEEE 802.11b connection command, IEEE 802.11b connection parameter and / or IEEE 802.11b connection data, for example, after converting the Bluetooth command, Bluetooth parameter and Bluetooth data in the manner described above. This means that the Bluetooth connection of the application is routed through the IEEE 802.11b wireless connection.

The method defined above considers the transmission of data from an application via the access layer, the adaptation layer and the radio layer. However, the inventive concept is similarly applicable to the case where data is received and provided to an application. A reception method for wireless data transfer between the first multimedia device and the second multimedia device is defined as follows. The first multimedia device and the second multimedia device are connected via a wireless connection operated according to a first wireless standard or a second wireless standard, and the first wireless standard and the second wireless standard are not different or compatible with each other. The receiving method includes the following steps.

A transmission data reception step in which transmitted radio data which has been transmitted via the radio connection is received according to a selected radio standard which is the first radio standard or the second radio standard.

An adaptive layer processing step in which the transmitted wireless data is processed to obtain a connection command, a connection parameter, and / or connection data of the first wireless standard. As above, the selected wireless standard may be different from the first wireless standard, and thus, in the adaptive layer processing step, standard conversion is performed in the same manner as described above.

An access layer processing step in which the connection command, connection parameter and / or connection data of the application radio standard are processed to obtain respective application commands, application parameters and / or application data of the first radio standard.

An application data processing step in which said application command, application parameters, and / or application data are provided to an application of said first multimedia device.

Therefore, one idea of the present invention is to provide an adaptive layer processing step for performing standard conversion when the selected radio standard is different or incompatible with the first radio standard. If the two standards are the same or compatible, no standard transformation is performed, ie the adaptive layer processing step consists in passing the data without any modification. "Compatible standard" in the sense of the present invention means that, for example, if the application is an Internet application, all processing steps according to, for example, Transmission Control Protocol (TCP) are performed within the access layer processing step. . The IEEE 802.11a standard is compatible with the TCP / IP standard. In this example, within the adaptive layer processing step, no standard conversion is required.

Therefore, the adaptation layer realizes one or more of the following three tasks, command conversion, parameter conversion and data conversion. Command translation means translating a command of the first wireless standard into a corresponding command of the selected wireless standard. For example, the Bluetooth command can be translated into the corresponding WLAN command. Parameter conversion may mean, for example, that the packet length is described in bytes in the first radio standard and in milliseconds in the selected radio standard. For example, if one data format needs to be mapped to another data format, data conversion is needed. One example is the audio codec. Over Bluetooth, an MP3 audio codec may be used, but other wireless standards require transcoding, eg converting it to linear PCM.

In the case of the switching of the selected standard from the first wireless standard to the second wireless standard, the following steps are performed.

Open a new, temporary additional radio connection between the first multimedia device and the second multimedia device operating according to the second wireless standard.

Select the second wireless standard as the selected wireless standard.

Activate the new wireless connection with the wireless connection. If the remaining original connection is no longer needed, the original connection is closed.

This is, according to the present invention, the amorphous switching of the radio standard of the radio connection from the first radio standard to the second radio standard is realized by the following steps.

Open a new and temporary additional radio connection in accordance with the second radio standard.

The selected radio standard identical to the second radio standard, using the adaptation layer, an adaptation layer processing step for standard conversion of connection parameters and / or connection data from a first radio standard to a second radio standard. Obtain the processed connection command, the processed connection parameters and / or the processed connection data of the.

Transmit and output the processed connection command, the processed connection parameters and / or the processed connection data over the new wireless connection according to the second wireless standard.

In a preferred embodiment, the wireless data transfer method realizes a point-to-point connection between the first multimedia device and the second multimedia device. This means that no complicated network functions are required at all and the present invention provides a simple solution for the connection of two multimedia devices connected via a wireless connection. In other words, in this preferred embodiment, the network shape does not change at all and there is always a point-to-point connection, ie there is no other device with which the first multimedia device and the second multimedia device are associated.

Preferably, the adaptive layer processing step is performed in the adaptive layer. Further, the access layer processing step is preferably performed at the access layer, and the transmission step is performed within the radio layer. Therefore, the adaptation layer realizes the interface between the connection layer and the radio layer.

In addition, since the wireless standard is different from or incompatible with the first wireless standard, standard conversion is performed within the adaptive layer processing step. As mentioned above, in the case of the method defined above, this means that one connection command or one connection parameter is converted into one or several processed connection commands or processed connection parameters. In the case of the defined receiving method, this means that the transmitted command and / or transmitted parameter included in the transmitted wireless data is converted into one or more respective connection commands or connection parameters. For example, the connection layer may send the command "UWB_Send_Data" which is an example of a connection command in the case of an ultra wide band (UWB) connection. Then, in the adaptive layer processing step, this command "UWB_Send_Data" may be converted into a command compatible with the command set of the selected wireless standard, for example the command "UWB_Send_Data" may be converted into the command "WLAN_Send_Data". In this example, the application will have an ultra wide band (UWB) connection, and the wireless layer will have a wide area local network (WLAN) connection. In this example, since the application has an ultra wide band (UWB) connection, the application sends the command "UWB_Send_Data" to the application's command format, that is, the connection command "UWB_Send_Data", and the application command "UWB_Send_Data" must be exactly the same format. You don't have to have, but you have the same concept.

The selected wireless standard is selected based on the nature of the wireless connection, the distance between the first multimedia device and the second multimedia device, and / or a direct request from the application.

Preferably, the selected wireless standard is selected according to the battery condition of the first multimedia device and / or the battery condition of the second multimedia device. For example, when the battery of the first multimedia device and / or the second multimedia device is low, ie almost empty, it is better to use a selected wireless standard that consumes as little energy as possible. For example, if the wireless standard of the wireless connection is currently an IEEE 802.11b standard with relatively high power consumption and the battery of the first multimedia device is low, the system immediately switches to the Bluetooth standard, which is a wireless standard. An alert requesting the user to get closer to the second multimedia device if a wireless standard with low power consumption is not available because the user possessing the first multimedia device is spaced away from the second multimedia device. A message may be displayed. In addition, the standard may be switched according to a power supply state of the first multimedia device and / or the second multimedia device. For example, if the first multimedia device is operated on a battery, the Bluetooth standard may be selected. However, if the first multimedia device is connected to the main power supply by the user, ie the first multimedia device is no longer running on the battery. Then, other wireless standards may be selected, for example, the IEEE 802.11a or IEEE 802.b standard. In other words, a wireless standard consuming less power is selected when the first multimedia device and / or the second multimedia device are operated on a battery, whereas each device is connected to a mains power supply, i.e. Faster wireless standards with higher power consumption are selected when each device is not running on batteries.

The attributes of the wireless connection include signal strength, quality of service, energy efficiency, and the like. This means that the signal strength, quality of service, energy efficiency, etc. of all possible or available wireless standards available for the wireless connection are observed, and the selected wireless standard most suitable at the present time is selected. The choice of energy efficiency means choosing the wireless standard as the selected wireless standard that consumes or uses only very little power, taking into account the power consumption of all possible or available wireless standards. As such, the required bit rate may be considered. For example, if a low bit rate application is operating over a wireless LAN (WLAN), switching to Bluetooth may be more efficient since Bluetooth typically consumes less power at a sufficient bit rate. This does not necessarily have to be tied to the battery conditions of the device. Devices such as personal digital assistants (PDAs) or mobile telephones are always struggling for low power consumption as well as when the battery is close to empty, ie it is always desirable to use as little power as possible. In other words, if the wireless connection has a high bit rate and high power consumption and a high bit rate is not required by the application, preferably, the wireless standard is lower but consumes less power with sufficient bit rate. Switching to another wireless standard, that is, the selected wireless standard is selected to be a standard with lower bit rate and lower power consumption. It may also be possible to select the selected wireless standard according to the frequency band indicator. The frequency band indicator indicates which frequency band is currently disturbed by another radio signal and which frequency band is available, ie empty for use. For example, Bluetooth and IEEE 802.11b operate in the same frequency band. If Bluetooth is disturbed due to other radio signals in its frequency band, then IEEE 802.11b is also likely to be disturbed, and switching to IEEE 802.11b makes no sense. However, IEEE 802.11a is operating in a different frequency band, so if the frequency band indicator signals within that selection step that another frequency band is currently better, i.e. available, to use, then the selected radio standard is It may be a standard that uses the frequency band freely.

For example, if the wireless connection is operated in accordance with the Bluetooth standard and the user walks around with the first multimedia device, the user walks in or near the range that can be covered by the Bluetooth standard or is in a range (typically 10 m). If it does, the signal strength of the wireless connection may be low. Then, a drop in signal strength is detected. The first multimedia device and the second device may alternately communicate in accordance with the IEEE 802.11b standard as a wireless standard. The range of IEEE 802.11b is larger than that of the Bluetooth standard. Therefore, a new wireless connection is established between the first multimedia device and the second multimedia device, and the new wireless connection operates according to the IEEE 802.11b standard. Then, data transfer is switched from the wireless connection operating according to the Bluetooth wireless standard to the new wireless connection operating according to the IEEE 802.11b standard by using the adaptation layer.

In a preferred embodiment, the distance between the first multimedia device and the second multimedia device is determined based on positioning system data (GPS) or position data of the planned European Galileo positioning system. Therefore, the first multimedia device and / or the second multimedia device may comprise a positioning system for determining the location of the first multimedia device and / or the second multimedia device.

In a preferred embodiment, said selection of said wireless standard is performed by a management unit. Therefore, the management unit observes the property of the radio connection, the distance between the multimedia device and the second multimedia device, and a battery condition or battery condition.

In a further preferred embodiment of the invention, the first multimedia device is a video camcorder and the second multimedia device is data processing means. In this embodiment, the user can freely walk around with the video camcorder in his hand while transferring data to the data processing means. This does not require the user to experience the interruption of the connection when the wireless standard is switched.

The data processing means and / or the first multimedia device may be a personal computer, a notebook, a video recorder, a television set, a personal digital assistant (PDA), a cellular phone, a mobile video viewer, a mobile game device, eg a gameboy-type, Mobile audio player, such as a Walkman or MP3-player, wireless headphones, and the like.

The management unit also notifies the application that a selected wireless standard has been selected, and the application adjusts the bit rate of the application data according to the selected wireless standard. For example, when the wireless standard is switched from the IEEE 802.11b standard to the Bluetooth standard, the management unit notifies the application to reduce the bit rate. This is necessary because the maximum possible bit rate of the Bluetooth standard is smaller than the maximum possible bit rate of the IEEE 802.11b standard.

The first and second wireless standards are the following standards, IEEE 802.11a, IEEE 802.11b or IEEE 802.11g, IEEE 802.15 / WPAN, IEEE 802.15.1, IEEE 802.15.3 (Wireless Personal Area Network (WPAN) )), IEEE 802.15.3a, IEEE 802.15.4, IEEE 802.11a, IEEE 802.11b, Bluetooth (BT), and ZigBee. In addition, the connection command, connection parameters, and / or connection data may correspond to any one of the following standards or specifications (existing standards), UDP, TCP, or Bluetooth (BT).

It should be noted that the present invention is not limited to being used for amorphous switching between other standards or existing standards, such as Bluetooth or ZigBee, but can also be applied to dedicated wireless systems. A popular area currently dominated by dedicated wireless systems is the market for wireless mouse devices for personal computers. Basically, each manufacturer has its own wireless system that is not standard and therefore incompatible with other manufacturer devices at all, such as not being able to use a Microsoft wireless mouse with a Logitech receiver, for example.

This indicates that the term "wireless standard" does not mean, for example, that an international standard is meant, but rather means any kind of system that describes how wireless data is transmitted. This indicates that it may be more appropriate to use the term “wireless system” instead of “wireless standard,” so that the invention is not limited to the particular standard agreed by the standardization committee.

A special case relates to the ultra wide band (UWB). At present, there are no fixed standards or specifications. However, it will probably be called IEEE 802.15.3a. In addition, it is expected that there will be additional specifications by industry groups on top of IEEE 802.15.3a. Of course, the invention is similarly applicable to future standards of this kind.

The wireless data transfer system according to the present invention is capable of performing or realizing a wireless data transfer method as mentioned above and having means therefor. Further, the computer program product according to the present invention includes computer program means adapted to perform or realize the above-defined wireless data transfer method and / or steps when executed in a computer, digital signal processing means or the like. The computer-readable storage medium according to the present invention includes a computer program product as defined above.

Multimedia device according to the invention connected with an additional multimedia device via a wireless connection operating according to a first wireless standard or a second wireless standard, wherein the first wireless standard and the second wireless standard are different or incompatible Is,

Adapted to receive application instructions, application parameters and / or application data of the wireless standard from an application layer and process the application instructions, application parameters and / or application data to each connection instruction, connection of the first application wireless standard. An access layer adapted to generate parameters and / or connection data,

A selection unit adapted to select the first radio standard or the second radio standard as a selected radio standard,

An adaptation layer adapted to process the connection command, connection parameters and / or connection data to generate processed connection commands, processed connection parameters and / or processed connection data of the selected wireless standard,

Transmission means 120 for transmitting and outputting the processed connection command, the processed connection parameters and / or the processed connection data via the wireless connection according to the selected wireless standard, and

A management unit adapted to select the selected wireless standard according to a distance between the multimedia device and the additional multimedia device and / or a direct request from the application, such as signal strength, quality of service, etc. of the wireless connection.

The selected wireless standard is different or incompatible with the first wireless standard BT, and the adaptation layer is adapted to perform standard conversion. In a preferred embodiment, the multimedia device is a video camcorder, personal computer, notebook, video recorder, television set, personal digital assistant (PDA), or mobile phone.

The invention and its advantageous details will be described through its embodiments in the following detailed description with reference to the accompanying drawings.

1 illustrates the attributes of another wireless standard.

2 illustrates a typical usage scenario of the present invention.

Figure 3 shows a block diagram for explaining the steps of the present invention.

Figure 4 shows a block diagram for explaining further steps of the method of the invention and the units of the invention.

FIG. 5 shows a diagram illustrating the steps performed by other units and / or layers in a general manner.

FIG. 6 shows a diagram illustrating the steps performed by other units and / or layers in certain embodiments.

In Figure 1, the bit rate, range, and power consumption of different wireless standards are shown. Other wireless standards are IEEE 802.11a, IEEE 802.11b, ultra wide band UWB, and Bluetooth BT. In the foregoing list, power consumption ranges from high to low, ie the IEEE 802.11a standard has the highest power consumption, while the Bluetooth standard BT has the lowest power consumption.

Other standards have the following typical power consumptions.

-Bluetooth 200mW

IEEE 802.b approx. 1 W

Note that these values are very situation dependent and widely variable, making them difficult to compare.

Other standards have different ranges given below.

IEEE 802.11b approximately 100m

IEEE 802.11a approximately 50m

Ultra wide band UWB approximately 10m

-Bluetooth BT 10m or 100m (depending on Bluetooth type)

The bit rates of these standards are approximately as follows.

Ultra wide-band UWB approximately 100 Mbps (megabits per second)

IEEE 802.11a approximately 55 Mbps

IEEE 802.11b approximately 10 Mbps

-Bluetooth BT up to 720kbps (kilobits per second)

Note that for the ultra wide band (UWB), the closer the two devices are, the higher the speed. Extremely close devices will achieve bit rates up to several hundred Mbps, but will be about 100 Mbps at normal coverage.

Figure 2 shows the range of the Bluetooth standard BT and the range of the wireless LAN network WLAN operating in accordance with the IEEE 802.11b standard. Figure 2 further shows a notebook NB having a video camcorder CAMC and a wireless connection WC. The wireless connection WC of FIG. 2 is a Bluetooth BT connection. When the user walks out of range of the Bluetooth BT, the prior art radio connection WC is interrupted. As a result, the user suffers from various inconveniences such as lost data, poor image quality, and the like.

In Figure 2, both the notebook NB and video camcorder CAMC are equipped with an IEEE 802.11b receiver. However, even if other standards are available, such as in the example of the IEEE 802.11b standard, if the user leaves the Bluetooth BT range according to the prior art, the user still suffers the inconvenience mentioned above. This is because systems according to the prior art do not provide seamless switching between different wireless standards.

The present invention focuses particularly on improving the situation described above in connection with FIG. 2. This means that the present invention can be used in the above scenario for switching the wireless standard from the Bluetooth BT standard to the IEEE 802.11b standard. As the user walks out of the range of Bluetooth BT with a video camcorder CAMC, the present invention provides seamless switching to the IEEE 802.11b standard.

3 shows a block diagram illustrating a standard transform using an adaptation layer 117. 3 shows a video camcorder CAMC on the left side and a notebook NB on the right side. The video camcorder CAMC has an application layer with a data storage means DSM. Data Storage Means The DSM provides data to be transmitted, for example video data, via an IEEE 802.11b wireless access IEEE 802.11b-WC.

However, the user began transferring video data from the video camcorder CAMC to the notebook NB while in the Bluetooth range. Therefore, the video camcorder CAMC and notebook NB initially established a Bluetooth connection. This means that the application layer 113 is initially connected to the connection layer 119 of the video camcorder CAMC using the Bluetooth application command BT-AC, the Bluetooth application parameter BT-AP and the Bluetooth application data BT-AD. Communicate via Bluetooth application connection 103. In the connection layer 119, to obtain the Bluetooth connection command BT-CC, the Bluetooth connection parameter BT-CP, and the Bluetooth application connection data BT-CD, the Bluetooth application command BT-AC, the Bluetooth application parameter BT-AP, and Bluetooth application data BT-AD is processed. While the Bluetooth connection between the video camcorder CAMC and the notebook NB was used for data transfer, these commands were provided directly to the Bluetooth BT interface in the wireless layer 120. In this case, the adaptation layer 117 passes the Bluetooth connection command BT-CC, the Bluetooth connection parameter BT-CP, and the Bluetooth connection data BT-DC directly, ie without modification, to the wireless layer 120.

When the user walks in the range of Bluetooth BT, the present invention provides seamless switching to the IEEE 802.11b wireless standard in the example of FIG. One aspect of enabling seamless switching is the use of the adaptation layer 117. In the example of FIG. 3, the adaptation layer 117 is an IEEE 802.11b-processed access command IEEE 802.11b-CC, an IEEE 802.11b-processed access parameter IEEE 802.11b-CP, and IEEE 802.11b-processed access data. In order to obtain IEEE 802.11b-CD, it is used to modify the Bluetooth connection command BT-CC, Bluetooth connection parameter BT-CP and Bluetooth connection data BT-CD. This means that the Bluetooth connection command BT-CC, the Bluetooth connection parameter BT-CP, and the Bluetooth connection data BT-CD have been processed. Treatment here can mean several aspects. For example, the Bluetooth connection command BT-CC may correspond to one or more IEEE 802.11b connection commands IEEE 802.11b-CC. The same applies to the Bluetooth connection parameter BT-CP, that is, one Bluetooth connection parameter BT-CP can be converted to one or more IEEE 802.11b connection parameters IEEE 802.11b-CP. Several Bluetooth connection commands BT-CC and / or Bluetooth connection parameters BT-CP may be converted into one single IEEE 802.11b connection command IEEE 802.11b-CC and one single IEEE 802.11b connection parameter IEEE 802.11b-CP, respectively. have.

In other words, the adaptation layer 117 takes care of all necessary steps for the standard transformation. Therefore, an important aspect of the present invention is that the top layers, ie the connection layer 119 and the application layer 113, are not aware of the standard transformation by the adaptation layer 117. This means that the application layer 113 still communicates with the access layer 119 via the Bluetooth application connection 103 according to the Bluetooth standard. In addition, the connection layer 119 is not aware of the standard conversion, and therefore still provides the Bluetooth connection command BT-CC, the Bluetooth connection parameter BT-CP, and the Bluetooth connection data BT-CD to the adaptation layer.

Then, the IEEE 802.11b-processed access command IEEE 802.11b-CC, IEEE 802.11b-processed access parameter IEEE 802.11b-CP, and IEEE 802.11b-processed access data IEEE 802.11b-CD are the radio layer 120 In the IEEE 802.11b interface. The wireless layer 120 then transmits these data as IEEE 802.11b transmit data IEEE 802.11b-TD via the IEEE 802.11b wireless access IEEE 802.11b-WC.

Transmitted IEEE 802.11b Transmitted Data The IEEE 802.11b-TD is received by each IEEE 802.11b interface of the wireless layer 120 of the notebook NB. Within the laptop NB, the data is processed in a somewhat opposite way compared to the video camcorder CAMC. This is the IEEE 802.11b connection command included in the IEEE 802.11b transmission data IEEE 802.11b-TD, the IEEE 802.11b-CC, the IEEE 802.11b connection parameters IEEE 802.11b-CP, and the IEEE 802.11b connection data. Each adaptation layer 117 of the NB is provided. Within the adaptation layer of the notebook NB, the IEEE 802.11b commands, parameters and data are provided to the connection layer 119 of the notebook NB in the Bluetooth connection command BT-CC, the Bluetooth connection parameter BT-CP, and the Bluetooth connection data BT-CD. Conversion to the Bluetooth application command BT-AC, the Bluetooth application parameter BT-AP, and the Bluetooth application data BT-AD is performed. The obtained Bluetooth application command BT-AC, Bluetooth application parameter BT-AP, and Bluetooth application data BT-AD are provided to the application layer 113 of the notebook NB. In the application layer 113, video data included in the Bluetooth application data BT-AD is displayed on the display DIS.

4 illustrates another important aspect of the present invention, wherein the management unit 121 is used to control the switching of the multimedia device to another wireless standard. The architecture of FIG. 4 may be applied not only to a multimedia device receiving data but also to a multimedia device transmitting data. This means that in the examples of FIGS. 2 and 3, the architecture of FIG. 4 may also be applied to the video camcorder CAMC and notebook NB.

The management unit 121 decides to switch to another wireless standard according to several events. For example, the management unit 121 may observe the signal strength of the wireless connection of the multimedia device via the wireless indicator 108. If the signal strength of the currently used wireless connection becomes low, the management unit 121 observes the signal strength that can be obtained with other available wireless standards. If the obtainable signal strength of another wireless standard is better, the management unit 121 may decide to switch to this other wireless standard. Therefore, the management unit 121 uses the switching signal 107 provided to the application layer 117. The application layer 117 then takes care of all the necessary steps to establish a new connection of another wireless standard. In addition, the adaptation layer performs all the steps described above for standard transformation.

The management unit 121 can observe the quality of service of the data stream via the data stream signals 105, 106. This means that the management unit 121 performs data stream measurement. Based on the quality of service, the management unit 121 may choose to use a wireless standard that is different from the current wireless standard. For example, if the quality of service becomes poor, the management unit 121 may select another wireless standard that enables better quality of service.

Additional external indicators are, for example, radio band indicators. For example, Bluetooth and IEEE 802.11b operate in the same frequency band. If Bluetooth is disturbed due to other radio signals in that frequency band, then IEEE 802.11b will also be disturbed and switching to IEEE 802.11b would not make sense. However, if IEEE 802.11a is operating in a different frequency band, and thus the frequency band indicator signals that another frequency band is currently more suitable, this would be an important aspect for the management unit.

The management unit 121 receives the external information via the external signal 104. For example, the measurement unit 121 may be provided with positioning data GPS via the external signal 104. The positioning data indicates the location of the multimedia device and the location of other multimedia devices connected to the multimedia device via a wireless connection. The measuring unit 121 calculates the distance between the two devices from these positions and, if the distance takes a value greater than the predetermined threshold, may decide to switch to another standard.

In either case, if the management unit 121 determines that the wireless standard should be switched, this is performed via the switching signal 107.

The management unit 121 can observe the battery condition, that is, the battery level of the multimedia device. If the battery is low, that is, if the remaining power of the battery is low, the management unit 121 may decide to switch to another wireless standard that consumes less energy than the current wireless standard. For example, if the current wireless standard used is an IEEE 802.11b standard with a relatively high power consumption (see Figure 1), the management unit 121 recognizes that the battery is low. You can switch to the Bluetooth BT standard, which requires significantly less energy.

Aspects of observing residual power in a battery may help to extend the overall time a multimedia device can be used by a user.

The management unit 121 may be notified by the application 113 to switch to another wireless standard via the external indicator 101. This, when the application 113 determines to switch to another wireless standard, the management unit 121 transmits and outputs the switching signal 107 to the adaptation layer 117 representing the desired wireless standard to be switched.

In some cases, management unit 121 needs to notify application 113 of standard switching. This is done via standard information signal 118. The management unit 121 needs to notify the application 113 due to the different bit rate of the new wireless standard being switched. In conclusion, the application 113 can adapt the bit rate of the transmitted output data stream.

4 further illustrates several connections of a multimedia device. The application 113 has a TCP / UDP handle 102, and consequently exchanges data with the TCP / UDP connection layer 114 at the connection layer 119. The TCP / UDP connection layer 114 has a TCP / UDP connection 109 directly mapped to the IEEE 802.11a interface of the radio layer 120. In this case, no standard transformation is performed by the adaptation layer 117. However, the management unit 121 may signal to the adaptation layer 117 to switch to the Bluetooth standard via the switching signal 107. In this case, the adaptation layer 117 establishes a Bluetooth BT connection. After establishment of the Bluetooth BT connection, the adaptation layer 117 performs standard conversion as described above. This means that the data is now mapped to the Bluetooth BT interface of the wireless layer 120 using the converted TCP / UDP connection 110.

4 also shows another example where the wireless standard is switched from Bluetooth to the IEEE 802.11b standard. In this example, the application 113 has a Bluetooth handle 103 from the Bluetooth connection layer 119. Prior to standard switching, the Bluetooth connection layer 115 has a Bluetooth connection 112 that maps directly to the Bluetooth interface of the wireless layer 120. After the management unit 121 transmits and outputs a switching signal 107 indicating switching to the IEEE 802.11b standard, the adaptation layer 117 establishes an IEEE 802.11b connection. After establishment of the IEEE 802.11b standard connection, the adaptation layer 117 initiates standard conversion of the Bluetooth standard to the IEEE 802.11b standard. This means that all data that was sent over the Bluetooth connection 112 that was mapped directly before switching is now sent over the converted Bluetooth connection 111 to the IEEE 802.11b interface.

FIG. 5 illustrates other steps performed to enable seamless switching from radio technology A to radio technology B in radio layer 120.

Before switching from wireless standard A (wireless technology A) to wireless standard B (wireless technology B) is described, steps for opening a connection according to wireless standard A are described.

In step 212, the application layer 113 sends the command “A_Open_Connection” to the adaptation layer 117. The adaptation layer 117 thus transmits and outputs the command “A_Open_Connection” to the radio unit of radio technology A in the radio layer 120 in further processing step 222. Therefore, the wireless unit of radio technology A establishes a connection at step 232. The data traffic then begins at step 233. After the data traffic is initiated, the application layer 113 begins to transmit data by the command "A-Send_Data" in step 213. Therefore, the adaptation layer 117 sends the command "A_Send_Data" in step 223. Therefore, the wireless unit in the wireless layer 120 transmits data at step 234.

While data is transmitted over radio technology A, management unit 121 receives an indicator event at step 202. Therefore, the management unit 121 evaluates another wireless system in step 203. If management unit 121 determines that wireless technology B is better suited with respect to, for example, quality of service, signal strength and / or power consumption, management unit 121 may switch to another wireless system at step 204. have. Therefore, the management unit 121 sends a signal 286 to the adaptation layer 117. Upon receiving signal 286 from management unit 121, adaptation layer 117 sends signal 280 to a radio unit of radio technology B. The radio unit of radio technology B then establishes a connection in accordance with radio technology B in step 242. After the connection of radio technology B is established, the adaptation layer 117 begins routing data traffic at step 205. Therefore, the adaptation layer 117 sends each signal 281 to the radio unit of radio technology B. There the radio unit of radio technology B initiates data traffic at step 243.

After the connection of the radio technology B is established, the application layer 113 continues to transmit data with the command "A_Send_Data" in step 214. The adaptation layer 117 receives this command and converts it to wireless standard B. In this case, this means that the adaptation layer 117 converts the command "A_Send_Data" into "B_Send_Data" as indicated in step 224. The adaptation layer 117 then provides data to the radio unit of radio technology B via signal 284 in accordance with radio standard B. The radio unit of radio technology B transmits data in accordance with radio standard B in step 244.

Since the wireless connection of radio technology A is no longer needed, at step 235 the data traffic is stopped. Therefore, the adaptation layer 117 sends the command “A_Close_Connection” to the radio unit of radio technology A in step 227. The wireless unit of wireless technology A then closes the connection at step 236.

The application layer 113 is not aware of the switching from radio technology A to radio technology B. This means that the application layer 113 continues to transmit data using the command "A-Send_Data" (step 215). The adaptation layer converts the command "A_Send_Data" into a command "B_Send_Data". Data is provided to the wireless unit of radio technology B via signal 285 and transmitted and output in step 245.

As can be seen in the above example, the adaptation layer 113 has no knowledge that the wireless standard has been switched from wireless standard A to wireless standard B. Therefore, the application layer 113 still transmits data according to the instruction set of radio technology A. In other words, the application layer 113 still transmits application commands, application parameters, and application data according to the first wireless standard used prior to switching of the wireless channel standard.

FIG. 6 shows a diagram similar to FIG. 5 illustrating similar steps where radio technology A is an ultra wide band UWB and radio technology B is a wireless local area net WLAN. Therefore, in step 312, the application layer 113 sends the command “UWB_Open_Connection” to the application layer 117. Upon receiving this command, the adaptation layer 117 sends the command "UWB_Open_Connection" to the UWB unit of the wireless layer 120 (step 322). Upon receiving this signal, the UWB unit of the wireless layer 120 establishes a connection in step 332 and initiates a video stream (step 333). After the video stream is initiated, the application layer 113 sends data "UWB_Send_Data" (step 313) to the application layer 113. The adaptation layer 117 sends data to the UWB unit using the command "UWB_Send_Data" (step 323). The UWB unit sends video data at step 334.

While video data is transmitted and output according to the ultra wide band UWB standard, the management unit 121 recognizes the low signal of the ultra wide band UWB in step 302. The management unit 121 further detects in step 303 that the WLAN signal is better than the ultra wide band UWB signal, ie stronger. Therefore, management unit 121 decides to switch to the wireless local area network WLAN standard in step 304. Therefore, the management unit 121 sends a signal 386 to the adaptation layer 117. Therefore, at step 326, the adaptation layer 117 sends the command “WLAN_Open_Connection” to the wireless local area network WLAN unit 341 using the signal 380. The signal 380 is received by the wireless local area network WLAN unit 341 so that the wireless local area network WLAN unit 341 establishes a WLAN connection at step 342. The adaptation layer 117 then begins rerouting data traffic at step 305 using the signal 381. Upon receiving signal 381, the wireless local area network WLAN unit initiates a video stream at step 343.

After the video stream of the WLAN unit is started, the application layer 113 continues to transmit data using the command "UWB_Send_Data" in step 314. However, adaptation layer 117 now translates this command into command “WLAN_Send_Data” at step 324. Then, each WLAN data is transmitted to the WLAN unit via signal 384 and the video data is transmitted and output in step 344 according to the WLAN standard. After successful establishment of the WLAN connection and successful data transfer according to the WLAN standard, the video stream of the UWB connection is stopped at step 335.

The adaptation layer 117 then sends the command “UWB_Close_Connection” to the ultra wide band UWB unit in step 327. Therefore, the UWB unit closes the connection at step 336.

After the connection of the UWB unit is closed, the application 113 continues to transmit data using the command "UWB_Send_Data" (step 315). This command is converted to " WLAN_Send_Data " in the adaptation layer 117 at step 325. Data is provided to the WLAN unit of the wireless layer 120 via a signal 385. The WLAN unit transmits data according to the WLAN standard (step 345).

The following further description helps those skilled in the art to obtain a better understanding of the present invention.

The invention introduced allows seamless switching to point-to-point connections between different wireless technologies without stopping the ongoing data stream. Therefore, it is possible to use the wireless technology that best suits a particular situation and adapt to changing the situation in a mobile scenario by switching to another wireless technology.

Technical description

Some studies have been conducted in seamless handover between WLAN and WMAN networks. This research involves the competition of both technologies in network access points in certain areas, such as airports and other dense areas. However, such usage scenarios are typically associated with network providers, which will be in the form of networks that are fundamentally different from those used in the present invention.

Prior art in the art does not correspond to dynamic changes in transmission protocol standards / systems and data formats. The prior art is concerned with the problem of rerouting traffic at the exact time and the shape of the dynamically changing network. In the prior art in the art, the protocols / standards / systems used remain unchanged when a switch occurs, which means that the protocols are defined in a way that supports handover.

In addition, while the usage scenario in the prior art focuses on a user roaming another network access point connected through one backbone, the present invention focuses on wireless point-to-point connection and optimization of power consumption.

With respect to the bridging device for interconnecting the wireless PAN and the wireless LAN, the Bluetooth access point is further separated from each other in the range of Bluetooth, and the user with the mobile client device temporarily leaves the range of one Bluetooth access point. If it is necessary to enter the range of another Bluetooth access point, a method is described in which WLAN can be used as a back-up for a Bluetooth access point. In this case, the mobile client device is not WLAN but only Bluetooth enabled. The WLAN is only used to connect two Bluetooth access points. Therefore, this describes another use case with another network form.

Furthermore, with respect to a method and system for enabling seamless roaming of mobile devices during a wireless network, when all of the access points are connected to the Internet, the seamlessness of the mobile devices between different access points with different wireless technologies A method that can be moved to is described. Therefore, the network shape is different from that described in the present invention.

In automatic and seamless vertical roaming between a wireless local area network (WLAN) and a wireless wide area network (WWAN), active voice or streaming data connections can be maintained. A method for performing handover of a mobile device between a WLAN access point and a GSM base station is described. This leads to different network forms and usage scenarios than described in the present invention.

Details of further advantages of the present invention are described below.

There are different probabilities for different wireless technologies at present to transfer files and perform media streaming between two devices. For example, there have been several proofs of using Bluetooth wireless technology to stream sync video from a source. The same has been done for other WLAN systems and is part of the use case for future technologies such as ultra wide band (UWB).

Each technology is very dependent on the situation and has its advantages. Bluetooth is optimized for low power consumption, but does not cover more than 10 meters of range for many devices. WLANs have a wider range and higher bit rates, but consume significantly more power. 1 shows some examples of how different wireless technologies relate to each other in terms of range, bit rate and power consumption. Already today there are multimedia devices with a plurality of wireless technologies embedded in the PC, for example Bluetooth and WLAN. In the future, even more devices will have multiple wireless technologies on board.

Therefore, it is desirable to use each of the other techniques depending on the present situation. As shown in Fig. 2, a wireless mobile camera connected to a personal computer (notebook NB in Fig. 2) does not need a high bit rate and the camera needs to pay attention to power consumption and the distance is not too large, It must be operated over Bluetooth. However, if the mobile camera moves out of Bluetooth range, it will release the connection.

The present invention describes in particular how a device can switch to other wireless technologies without blocking, for example, ongoing video streams and data transfers, and optimizes power consumption. In the above example, WLAN may be used to extend range at the expense of higher power consumption outside of Bluetooth range, see FIG.

At present, most of the WPAN / WLAN technologies described in the present invention can be used alone to connect two devices. However, the prior art knows nothing about the approach that benefits from overlap between technologies in terms of power consumption, range, and usage scenarios of the manner described herein. The main use of the introduced invention is to optimize power consumption by selecting the optimal radio technology according to the present situation.

In order to seamlessly switch from one radio technology to another without blocking on-going data transmissions (eg media stream or file delivery), an adaptation layer is introduced to encapsulate the lower layer from the application. Most of the technologies applicable to this qname use Internet Protocol IP as the network layer. The present invention affects this fact, but is not limited to IP.

The present invention includes, for example, an architecture that introduces an adaptation layer and a sequence of events and actions used to implement seamless handover.

In some cases, the application does not need to know switching to another radio technology at the lower layer. In other cases, however, it is inevitable that the application should know to take some action, such as reducing the bit rate of the video stream.

The architecture of the described system is shown in FIG. This includes an application layer 113, a connection layer 119, an adaptation layer 117, a wireless layer 120, and a management unit.

The application layer 113 implements an actual application. For example, in the case of file delivery, this includes all the tasks related to providing the data to be delivered. This may include user interface, directory access, and the like. In the case of media streaming, the application is typically responsible for providing the media frames in a timely manner. The application is considered to be a user of the service provided by the present invention. An application refers to a specific connection using a connection handle. In the case of an IP connection, this is also referred to as a socket.

The application typically establishes a wireless connection to another device using the services of the connection layer 119. In the case of IP as a network protocol, upon return, the application receives a TCP or UDP connection handle or, in the case of Bluetooth, a corresponding handle of one of the Bluetooth profiles. Connection requests and handles are exchanged over 102 and 103. The architecture is open to include other wireless technologies 116 in the access layer. Open herein means that the present invention is not limited to the standards and / or specifications currently mentioned. This can be readily applied to future specifications, standards, and / or systems, in particular dedicated systems.

The adaptation layer 117 is responsible for mapping the connection from the access layer to the wireless layer. For example, in the case of direct mapping from a Bluetooth profile to a Bluetooth core layer (wireless layer), the adaptation layer may be kept inactive. Connections 109 and 112 are examples of such direct mapping. In other cases, the adaptation layer must emulate the functionality of a particular radio technology. If the Bluetooth profile is to be operated with ZigBee, for example, even if it is mapped to a ZigBee function inside the adaptation layer, the adaptation layer must be careful that the access layer only sees the Bluetooth function. Examples of such emulations are connections 110 and 111.

The task of the adaptation layer may be separated into three sub-tasks, command conversion, parameter conversion and data conversion. For example, command translation translates a command received in an 'Bluetooth language' from an application into a corresponding command in 'WLAN language' and is sent to the wireless layer. Such a command includes several parameters. Parameter conversion must be performed to convert these parameters. For example, in Bluetooth, the packet length is described in bytes, and in other wireless systems this may be stated in milliseconds. Finally, data conversion is necessary when one data format needs to be mapped to another data format. One example is the audio codec. On Bluetooth, mp3 may be used, but other wireless systems may require this to be transcoded into linear PCM.

The wireless layer 120 includes all the core functionality for other wireless technologies available to the system. As examples, FIG. 4 includes the ultra wide band, 802.11a + b, Bluetooth and Zigbee, but the architecture can easily be extended to other wireless technologies.

Finally, the architecture includes a management unit 121. This unit continuously evaluates data from different sources in order to be able to determine which wireless technology best fits the requirements in the current situation. Examples of sources considered by the management unit include radio indicators 108 (e.g. signal strength), quality measurements (e.g., number of packets lost) or external indicators (e.g., lost packets). 104, 101 (e.g., positioning data from GPS, direct requests from applications, etc.). After evaluating all these inputs, the management unit uses 107 to require the adaptation layer to switch to another radio technology. In some cases, it is also necessary to notify the application via 118. For example, an application may need to adjust the bit rate of the video codec.

5 illustrates a sequence of events and actions that are executed when the system switches from one wireless system to another. There are five columns for the event flow, management unit 121, application layer 113, adaptation layer 117, wireless system A and wireless system B.

The application establishes a connection by sending a request (step 212) to wireless system A (step 232) via the original application layer (step 222). At this point, the application layer pretends to be a wireless system A by accepting commands, parameters and data in exactly the same format as defined for the interface of the wireless technology A. At this point, the open request (step 212) received from the application is only forwarded to the wireless system B as an open request (step 222) without any modification. Wireless system A receives the request, actually establishes a connection (step 232), and prepares a connection for the transport of data traffic (step 233).

The application then actually transmits the data by sending a request in the format for wireless system A (step 213). The adaptation layer receives this and forwards it (step 223) to wireless system A without any change. Wireless system A transports the data to the remote side (step 234).

In the meantime, an indicator event (step 202), e.g., signal strength indicator, and evaluation of another wireless system (step 203) indicates that switching to wireless system B in the current situation (step 204) is more efficient. . Therefore, the management unit sends a signal 286 to the adaptation layer 117. Upon receiving this signal 286, the adaptation layer 117 sends the command “B_Open_Connection” to the wireless system B using the signal 280. Wireless system B then establishes a connection at step 242. The adaptation layer 117 then begins rerouting data traffic (steps 205, 281, and 243).

The application does not recognize this and continues to send data, i.e., still sending commands, parameters and data to the adaptation layer in the format of wireless system A (step 214). However, after rerouting is achieved, the adaptation layer 117 simply no longer forwards the request to the wireless system A, but converts it to a command with the parameters and data in the format of the wireless system B in a dash (step 224). This is sent as request to wireless system B (step 284). Wireless system B then transports the data to the remote side (step 244). In this step, the conversion of the request for radio system A into a request for radio system B may include translation of one command into one or more commands in another format, conversion of parameters into several parameters in another format, And conversion of data from one format to another. For example, in the case of media streaming, this conversion of data format may include transcoding from one code format to another.

During this time, wireless system A still has an active connection, even though it is not used for further traffic. Therefore, the adaptation layer 117 decides to separate it (step 227) and closes the connection (steps 235 and 236).

All data transmitted later by the application is converted by the adaptation layer in the manner described above (steps 215, 225, 285, 245). This means that the adaptation layer internally translates all commands, parameters and data and routes them to wireless system B, but pretends to be wireless system A. The application does not recognize that there has been a change in the lower layers, and thus can continue any data traffic, for example media streaming, without any interruption.

Example

A typical application scenario of the disclosed invention is a laptop computer, i.e. a video camcorder wirelessly connected to a notebook. Both laptops and camcorders have built-in two wireless technologies: ultra wide band UWB and WLAN. On first connection, the camcorder is only a few centimeters away from the laptop. Therefore, UWB is selected as the wireless system for this initial connection. For short distances, this provides higher data rates and lower power consumption than WLANs. After connecting, the user starts streaming video from the camcorder to the laptop.

Then, the user starts to move around with the camcorder. In doing so, it is outside the 10 meter range covered by the UWB. 6 illustrates a flow of actions and events occurring within the management unit 121, the application layer 113, the adaptation layer 117, the UWB scope 331 and the WLAN scope 341.

Initially, the user chooses to connect a camcorder and a laptop. This leads to a corresponding request from the application layer to the UWB layer via the adaptation layers 113 and 117. In this case, no translation is needed inside the adaptation layer, and instructions with that parameter are only forwarded to the UWB layer and executed there (steps 332 and 333). Then, the actual video streaming begins and data is sent from the application (step 313) to the UWB layer via the adaptation layer (step 323). Again, the adaptation layer does not need to translate commands or transform data. Since the application already uses the format for the UWB layer, it can simply be forwarded.

If the user moves around with the camcorder and is out of the 10 m range, the signal level for the UWB will be too low. This feels that the signal on the WLAN is better (step 303), thus switching to the WLAN (step 304) to open the WLAN connection (step 304, 386, 326, 380) and prepare it for streaming data transport (step 305, 381). 343, the management unit determines to reroute the data traffic (step 305).

In the meantime, the application is still sending video data packets in the format for the UWB (step 314). However, since the traffic was rerouted to the WLAN, the adaptation layer translates the command and converts the video packet into the WLAN's format and sends it to the WLAN as a "Send_Data" request (steps 324, 384). This step may include transcoding from one video codec to another, for example from MPEG-4 to MPEG-2.

Since maintaining the UWB channel is inefficient when no traffic is operating on the UWB channel, the adaptation layer 117 determines to close and close the UWB connection (steps 327, 335 and 336). All streaming video packets that continue to be transmitted from the application then (step 315) are being translated and converted as described above (steps 325 and 345).

During the entire time, it is essential to continue streaming in the manner in which the application initiated the stream. Even if there is a significant change in the lower layer, i.e. the switch of the transport bearer, there is no change to the application and thus no negative effect on the user. Without the present invention, the application would have to stop the stream, establish another connection and restart the stream on the new connection. The user will recognize this due to the visible interruption of the presented video.

Summary and Standard

Bluetooth

-Short range wireless personal area network rider

Low power cable replacement technology

-Range 10-100m

Bit rates up to 720kbps

-2.4GHz band

UWB

Ultra wide band

-Short range wireless personal area network technology

Range up to 10 meters

-Low power

-50Mbps or higher bit rate

The idea is to spread across the entire frequency band.

-Will be used for IEEE 802.15.3a.

IEEE 802.15 / WPAN

-Wireless Personal Area Network WPAN

802.15.1: equivalent to Bluetooth.

802.15.3: Targets wireless multimedia applications.

802.15.3a: Targets wireless multimedia applications.

802.15.4: The ZigBee Foundation, Wireless Home Appliance

Lower power consumption than WLA

IEEE 802.11 / WLAN

Wireless local area network WLAN

-Target the office environment

802.11a: ~ 50Mbps in 5GHz band

802.11b: ~ 11Mbps in 2.4GHz band

802.11g: ~ 50Mbps in 2.4Ghz band

-Higher power consumption than WPAN

Zigbee

The target is to connect a home appliance.

Example optical switch: It is cheaper to put a small wireless transceiver into the lamp and switch than to plug the cable into the wall.

Extremely low power consumption 2-year battery life

Low bit rate (250 kbps)

IEFT

-Internet Engineering Tagk Force

Responsible for defining protocols for the Internet world

Mp3

MPEG Layer 3 Audio

Codec used to reduce the data required for audio files / streams

Linear PCM

Format for unprocessed audio data (not encoded)

Reference

101: external indicator

102: TCP / UDP handle

103: Bluetooth application connection

103: Bluetooth handle

104: external signal

105, 106: data stream signal

107: switching signal

108: wireless indicator

109: direct mapped TCP / UDP connection

110: converted TCP / UDP connection

111: adaptive layer connection

111: converted Bluetooth connection

112: direct mapped Bluetooth connection

113: application layer

114: TCP / UDP connection layer

115: Bluetooth connection layer

116: additional connection layer

117: adaptation layer

118: standard information signal

119: connection layer

120: wireless layer

121: management unit

BT: Bluetooth standard

BT-AC: Bluetooth application command

BT-AD: Bluetooth Application Data

BT-AP: Bluetooth Application Parameters

BT-CC: Bluetooth connection command

BT-CD: Bluetooth connection data

BT-CP: Bluetooth connection parameters

CAMC: Video Camcorder

DSM: Data Storage Means

IEEE 802.11b-CC: IEEE 802.11b-processed access command

IEEE 802.11b-CD: IEEE 802.11b-processed access data

IEEE 802.11b-CP: IEEE 802.11b-Processed Connection Parameters

IEEE 802.11b-TD: IEEE 802.11b transmit data

IEEE 802.11b-WC: IEEE 802.11b wireless access

NB: Notebook

UWB: Ultra Wide Band

WLAN: wireless local area network

Claims (21)

A method of wireless data transfer between a first multimedia device (CAMC) and a second multimedia device (TV), wherein the first multimedia device (CAMC) and the second multimedia device (TV) comprise a first wireless standard (BT) or a second; Connected via a wireless connection operating according to a wireless standard (IEEE 802.11b), wherein the first wireless standard (BT) and the second wireless standard (IEEE 802.11b) are different from each other or incompatible; An application command (BT-AC), an application parameter (BT-AP), and / or an application data (BT-AD) of the first wireless standard (BT) are applied to the application 113 of the first multimedia device (CAMC). Receiving application data received from The application command (BT-AC), application parameter to obtain each connection command (BT-CC), connection parameter (BT-CP) and / or connection data (BT-CD) of the first wireless standard (BT); Connection layer processing step 119 in which (BT-AP) and / or application data (BT-AD) are processed, A selection step wherein the first wireless standard (BT) or the second wireless standard (IEEE 802.11b) is selected as the selected wireless standard, -Processed connection command (IEEE 802.11b-CC), processed connection parameter (IEEE 802.11b-CP) and / or processed connection data (IEEE 802.11b) of the selected radio standard (IEEE 802.11b; 802.11a; BT); An adaptive layer processing step in which the connection command (BT-CC), connection parameter (BT-CP) and / or connection data (BT-CD) are processed, to obtain a CD), and The processed connection command (IEEE 802.11b-CC), the processed connection parameters (IEEE 802.11b-CP) and / or the processed connection data (IEEE 802.11b-CD) are selected by the selected wireless standard (IEEE 802.11b; 802.11). a transmitting step of transmitting and outputting through the wireless access (IEEE 802.11b-WC) according to BT; Wireless data delivery method comprising a. A wireless data transfer method between a first multimedia device (TV) and a second multimedia device (CAMC), wherein the first multimedia device (CAMC) and the second multimedia device (TV) comprise a first wireless standard (BT) or a second. Connected via a wireless connection operating according to a wireless standard (IEEE 802.11b), wherein the first wireless standard (BT) and the second wireless standard (IEEE 802.11b) are different from each other or incompatible; Transmitted radio data (IEEE 802.11b-TD) that was transmitted over the radio access (IEEE 802.11b-WC) according to a selected radio standard that is either the first radio standard (BT) or the second radio standard (IEEE 802.11b). Receive data transmission step), The transmitted wireless data (IEEE 802.11b-TD) to obtain a connection command (BT-CC), a connection parameter (BT-CP), and / or a connection data (BT-CD) of the first wireless standard (BT). An adaptive layer processing step wherein The application wireless standard BT / UDP / TCP-IP to obtain an application command BT-AC, an application parameter BT-AP and / or application data BT-AD of the first wireless standard BT; A connection layer processing step 119 in which the connection command (BT-CC), connection parameters (BT-CP) and / or connection data (BT-CD) of the " The application command (BT-AC), the application parameter (BT-AP), and / or the application data (BT-AD) are provided to an application 113 of the first multimedia device (TV). Wireless data delivery method comprising a. The method of claim 1 or 2, wherein the switching of the selected standard from the first wireless standard (BT) to the second wireless standard (IEEE 802.11b), Open a new, temporary additional wireless connection between the first multimedia device (CAMC) and the second multimedia device (TV) operating according to the second wireless standard (IEEE 802.11b), Select the second wireless standard (IEEE 802.11b) as the selected wireless standard, By operating the new wireless connection with the wireless connection Wireless data transfer method, characterized in that performed. The method according to any one of claims 1 to 3, And a point-to-point connection between said first multimedia device (CAMC) and said second multimedia device (TV). 5. Method according to one of the preceding claims, characterized in that the adaptation layer processing step is performed in an adaptation layer (117). The method according to any one of claims 1 to 5, The selected wireless standard (IEEE 802.11b; 802.11a; BT) is different from or incompatible with the first wireless standard (BT), so that standard conversion is performed within the adaptive layer processing step. Way. The method according to any one of claims 1 to 6, The selected wireless standard (IEEE 802.11b; 802.11a; BT) may be an attribute of the wireless connection (IEEE 802.11b-WC), the distance between the first multimedia device (CAMC) and the second multimedia device (TV), and / Or (203, 204; 303, 304) selected based on a direct request from the application (113). The method according to claim 1, wherein the selected wireless standard (IEEE 802.11b; 802.11a; BT) is based on the battery condition of the first multimedia device (CAMC) and / or the second multimedia device (TV). (203, 204; 303, 304) according to the battery condition of the). 9. The method of claim 7 or 8, wherein said attribute of said wireless connection (IEEE 802.11b-WC) includes signal strength, quality of service, energy efficiency, and the like. 10. The method according to any one of claims 7 to 9, characterized in that the distance between the first multimedia device (CAMC) and the second multimedia device (TV) is determined based on positioning system data (GPS). Wireless data delivery method. The wireless data transfer as claimed in any one of claims 7 to 10, wherein said selection of said selected wireless standard (IEEE 802.11b; 802.11a; BT) is performed by a management unit (121; 301). Way. 12. A method according to any one of the preceding claims, wherein said first multimedia device is a video camcorder (CAMC) and said second multimedia device is a data processing means (TV). 13. The wireless device of claim 12, wherein the data processing means is a personal computer, a notebook, a video recorder, a television set (TV), a personal digital assistant (PDA), a cellular phone, stereo headphones, and / or a mobile video viewer. How data is passed. The method according to any one of claims 9 to 13, wherein the management unit (121; 301) notifies the application (113) that a selected wireless standard (IEEE 802.11b; 802.11a; BT) has been selected. And the application (113) adjusts the bit rate of the application data (BT-AD) according to the selected wireless standard (IEEE 802.11b). The method according to any one of claims 1 to 14, The first wireless standard and the second wireless standard are any one of the following standards, IEEE 802.11a, IEEE 802.11b, Bluetooth (BT), or ZigBee, or IEEE 802.15.3, The connection command, connection parameter, and / or connection data correspond to any one of the following standards, UDP / TCP, Bluetooth (BT). 16. A wireless data transfer system, comprising, or having means for performing or realizing a method in accordance with any of claims 1-15 and / or any one of the steps. A computer program product comprising computer program means adapted to perform or realize a method of wireless data transfer when executed in a computer, digital signal processing means, etc., in accordance with any of claims 1 to 15 and / or any of the steps. A computer readable storage medium comprising the computer program product according to claim 17. A multimedia device (CAMC; TV) connected with an additional multimedia device (TV; CAMC) via a wireless connection operated according to a first wireless standard (BT) or a second wireless standard (IEEE 802.11b), wherein the first wireless Standard (BT) and the second wireless standard (IEEE 802.11b) are different or incompatible-, Adapted to receive an application command (BT-AC), an application parameter (BT-AP) and / or application data (BT-AD) of the first radio standard (BT) from an application layer (117), the application command (BT-AC), application parameters (BT-AP) and / or application data (BT-AD) to process each connection command (BT-CC) and connection parameters (BT-CP) of the first wireless standard (BT). And / or a connection layer 119 adapted to generate connection data BT-CD, A selection unit adapted to select the first radio standard (BT) or the second radio standard (IEEE 802.11b) as the selected radio standard, Process the connection command (BT-CC), connection parameter (BT-CP) and / or connection data (BT-CD) to process the processed connection command (IEEE) of the selected wireless standard (IEEE 802.11b; 802.11a; BT). An adaptation layer 117 adapted to generate 802.11b-CC), processed connection parameters (IEEE 802.11b-CP) and / or processed connection data (IEEE 802.11b-CD), The processed connection command (IEEE 802.11b-CC), the processed connection parameter (IEEE 802.11b-CP) and / or the processed connection data (IEEE 802.11b-CD) may be selected from the selected wireless standard (IEEE 802.11b; 802.11a). Transmission means 120 for transmitting and outputting via the wireless connection (IEEE 802.11b-WC) according to BT, and The selected wireless standard (depending on the signal strength of the wireless connection, the quality of service, etc., the distance between the multimedia device (CAMC; TV) and the additional multimedia device (TV (CAMC)) and / or direct request from the application 113 Management unit 121 (130) adapted to select IEEE 802.11b; 802.11a; BT) Multimedia device comprising a. The method of claim 19, The selected wireless standard (IEEE 802.11b; 802.11a; BT) is different from or incompatible with the first wireless standard (BT), and the adaptation layer 117 is adapted to perform standard conversion. device. 21. The method according to claim 19 or 20, wherein the multimedia device (CAMC) is a video camcorder (CAMC), a personal computer, a laptop, a video recorder, a television set (TV), a personal digital assistant (PDA), or a cellular phone. Multimedia device, characterized in that.

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