KR101567829B1 - Method of data transmission and data reception and devices in wireless networks - Google Patents

Abstract

A method of transmitting data in a transmitting device of a wireless network according to an embodiment of the present invention includes transmitting at least one data packet to a receiving device through a reserved area including channel resources allocated from a coordinator, And transmitting the channel time extension information to the receiving device to transmit the data packet through the unallocated area in which the arbiter does not allocate channel resources to the specific device.

WVAN, reserved area, unallocated area, channel resource

Description

TECHNICAL FIELD The present invention relates to a data transmission method, a data reception method,

The present invention relates to a wireless network, and more particularly, to a data transmission method, a data reception method, and a device between devices belonging to a wireless network.

2. Description of the Related Art Recently, there has been developed a wireless personal area network (hereinafter, referred to as " wireless personal area network "), ) Technology is being developed. WPANs can be used to exchange information between a relatively small number of digital devices at relatively short distances and enable low power and low cost communication between digital devices. IEEE 802.15.3 (Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for High Rate Wireless Personal Area Networks (WPANs) approved on June 12, 2003) It defines the specification for the physical layer (PHY).

1 shows a configuration example of a WPAN. As shown in FIG. 1, a WPAN is a network composed of individual devices within a limited space such as a home, and allows direct communication between devices to configure a network so that information can be seamlessly exchanged between applications . Referring to FIG. 1, a WPAN includes two or more user devices 11 to 15, and one of the devices operates as a coordinator 11. The regulator 11 serves to provide the basic timing of the WPAN and to control quality of service (QoS) requirements. Devices that can be used as devices include computers, PDAs, notebooks, digital TVs, camcorders, digital cameras, printers, microphones, speakers, headsets, barcode readers, displays, mobile phones and all digital devices.

A WPAN is not pre-designed and constructed, but is an ad hoc network (hereinafter referred to as a piconet) that is formed when needed, without the aid of a central infrastructure. A process of forming one piconet will be described in detail as follows. The piconet is initiated by any device capable of operating as a coordinator performing its function as a coordinator. All devices perform scanning before starting a new piconet or associating to an existing piconet. Scanning is a process in which a device collects and stores information on channels and examines whether existing piconets exist or not. A device that is instructed to start a piconet from an upper layer forms a new piconet without subscribing to a piconet already formed on a certain channel. The device selects a channel with low interference based on the data obtained in the scanning process and broadcasts a beacon through the selected channel to start the piconet. Here, the beacon is control information broadcasted by the regulator to control and manage the piconet such as timing allocation information, information on other devices in the piconet, and the like.

2 shows an example of a superframe used in a piconet. Timing control in the piconet is basically performed on the basis of superframes. Referring to FIG. 2, each superframe is initiated by a beacon transmitted from the coordinator. The Contention Access Period (CAP) is used by devices to transmit commands or asynchronous data in a contention-based manner. The channel time allocation block may include a management channel time block (MCTB) and a channel time block (CTB). MCTB is a period in which control information can be transmitted between a regulator and a device or between a device and a device, and a CTB is a period in which asynchronous or isochronous data can be transmitted between a device and a regulator or between other devices. The number, length and location of CAP, MCTB, and CTB in each superframe are determined by the coordinator and transmitted to other devices in the piconet via beacons.

If any device in the piconet needs to transfer data to a coordinator or other device, the device requests channel resources for data transmission to the coordinator, and the coordinator sends channel < RTI ID = 0.0 > Allocate resources. If the contention period exists in the superframe and the coordinator permits data transmission in the contention period, the device can transmit a small amount of data through the contention period without having to be allocated a channel time from the coordinator.

In the case where the number of devices in the piconet is small, there is no problem in allocating channel resources because each device has sufficient channel resources to transmit data. However, even if a channel resource is insufficient due to a large number of devices, When a large amount of data such as a moving picture is continuously occupied by occupying a channel, even if other devices have data to be transmitted, communication can not be performed because channel resources are not allocated, or even if channel resources can be allocated There is a possibility that only a small amount of channel resources can be allocated to the capacity of the data.

Accordingly, various methods for smoothly performing bidirectional communication between devices have been studied.

On a WVAN wireless network, a device must be allocated a certain amount of channel resources from the coordinator to transmit data to other devices. A device that is allocated a channel resource from the arbiter can specify a portion of the channel resource. When a channel resource is time-divided, a device allocates a channel resource from the arbitrator to use as a reserved region.

In general, a transmitting device requests a channel resource amount required based on the amount of data to be transmitted when a channel resource allocation request is made to the regulator, and data loss or data error may occur during the actual data transmission. In this case, the scheduled transmission amount can not be satisfied when data is transmitted through the reserved area, and the remaining data amount is transmitted through the next reserved interval, thereby causing a problem that the data transmission time is delayed. Also, on the receiving device side, there may arise a problem that the number of times of buffering or time increases when the received data is reproduced.

In addition, when data transmission is not completed within the channel resource allocated by the transmitter, the transmitter device performs an unnecessary process such as re-scheduling or setting up channel resources in the case of requesting a separate channel resource allocation to the arbiter.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method of efficiently allocating channel resources among devices in a wireless network. Specifically, it is a method for utilizing a non-reserved area as a reserved area so that a specific device can use a non-reserved area used by an arbitrary device according to a competition method between the devices.

Another object of the present invention is to smoothly transmit / receive data between devices without intervention of a regulator.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a method of transmitting data in a transmitting device of a wireless network, the method including receiving data from a receiving device through a reserved area including channel resources allocated from a coordinator, Transmitting the at least one data packet to the receiving device and transmitting the channel time extension information to the receiving device to transmit the data packet through the unallocated area in which the arbiter does not allocate channel resources to the specific device .

Advantageously, the channel resource may include at least one channel time block.

The channel time extension information may be included in the last data packet among the at least one data packet transmitted through the reserved area, and may be included in the MAC header of the last data packet according to the embodiment of the present invention.

The data transmission method according to an embodiment of the present invention may further include transmitting a data packet to the receiving device through the non-reserved area, receiving a response message according to the channel time extension information from the receiving device The method comprising the steps of:

The transmitting device may further include transmitting the data packet through the non-reserved area when the response message includes information to be accepted for the channel time extension. On the other hand, if the response message includes information rejected for channel time extension, the transmitting device may further include transmitting a data packet through a reserved area other than the reserved area to which the channel time extension information is transmitted . Wherein the response message is included in an acknowledgment (ACK / NACK) signal for the data packet received from the receiving device.

According to another aspect of the present invention, there is provided a method of transmitting data in a transmitting device of a wireless network, the method comprising: receiving a channel time block allocated from a coordinator; Transmitting at least one data packet to a receiving device through an included reserved area, transmitting the data packet to the receiving device through a reserved area not allocated to a specific device by a channel time block, Transmitting the extended information, and transmitting the data packet to the receiving device through the non-reserved area.

According to a second aspect of the present invention, there is provided a method for receiving data in a transmitting device of a wireless network, the method comprising: receiving, by a coordinator, Receiving from the transmitting device channel time extension information for receiving a data packet through a non-reserved area in which the arbiter does not allocate channel resources to a specific device.

The method of receiving data according to an embodiment of the present invention may further include the step of not switching the power mode to the power save mode in response to the received channel time extension information, And receiving the packet.

The method of claim 1, further comprising switching a power mode to a power save mode in response to the received channel time extension information, transmitting a data packet through a reserved area other than the reserved area that received the channel time extension information from the transmitting device The method may further include receiving the data.

The method of receiving data according to an embodiment of the present invention may further include transmitting a response message to the transmitting device in response to the channel time extension information. And receiving the data packet from the transmitting device through the non-reserved area when the response message includes information indicating that the power mode is not switched to the power saving mode. If the response message includes information indicating that the power mode is switched to the power save mode, the method may further include receiving a data packet through a reserved area other than the reserved area in which the channel time extension information is received from the transmitting device can do.

According to another aspect of the present invention, there is provided a method of receiving data in a receiving device of a wireless network, the method including receiving channel time blocks allocated from a coordinator, Receiving at least one data packet from a transmitting device through a reserved area, receiving the channel time extension information for receiving a data packet through a non-reserved area in which the arbiter does not allocate a channel time block to a specific device And receiving a data packet from the transmitting device through a channel time block of the unreserved area.

According to another aspect of the present invention, there is provided a transmitting device for transmitting data in a wireless network, the receiving device including: A transmitter for transmitting a data packet, a controller for generating channel time extension information for transmitting a data packet through a non-reserved area in which a channel resource is not allocated to a specific device, and transmitting the channel time extension information to the receiving device And a control unit for controlling whether or not a data packet is transmitted to the receiving device.

The transmitting device according to an embodiment of the present invention may further include a receiving unit, and the receiving unit may receive a response message for the channel time extension information from the receiving device.

The control unit may control the data packet to be transmitted to the receiving device through the non-reserved area when the response message includes information to be accepted for channel time extension. On the other hand, when the response message includes information rejected for channel time extension, it is possible to control the data packet to be transmitted to the receiving device through a reserved area other than the reserved area to which the channel time extension information is transmitted.

According to a fourth aspect of the present invention, there is provided a receiving device for receiving data in a wireless network, the receiving device comprising: a receiving device for receiving data from a transmitting device through a non- A receiving unit for receiving channel time extension information for receiving at least one data packet, and a controller for controlling the power mode in the non-reserved area to be switched to the power saving mode according to the channel time extension information.

The receiving device according to an embodiment of the present invention further includes a transmitter, wherein the controller generates a response message including information indicating that the power mode is not switched to the power saving mode, To be transmitted to the transmitting device.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention by those skilled in the art. And can be understood and understood.

According to an embodiment of the present invention, when a part of a non-reserved area of channel resources is used together with a reserved area when transmitting / receiving data between devices in a WVAN, channel resources allocated from the arbiter can be efficiently used.

In addition, according to an embodiment of the present invention, when a transmitting device that is to transmit data does not satisfy a scheduled data transmission amount through a reserved area of a channel resource allocated from a regulator, By transmitting data, the data transmission delay time can be reduced. In addition, in the receiving device that receives the data, the buffering time required for data reproduction can be shortened.

In addition, according to an embodiment of the present invention, a transmitting device requests a separate channel resource allocation to a coordinator to process an operation process such as data transmission or beam search through a non-reserved area without re-scheduling or setting up channel resources can do.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

In the following, the structure, operation and other features of the present invention can be easily understood by the embodiments of the present invention described 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 wireless private network (WPAN).

Fig. 3 shows an example of the configuration of the WVAN. The WVAN, like the WPAN shown in FIG. 1, is composed of two or more user devices 22 to 25, and one of them operates as a coordinator 21. The regulator 21 provides the basic timing of the WVAN, maintains a track of the devices belonging to the WVAN, controls quality of service (QoS) requirements, and the like. The regulator is also a device, so it acts as a regulator and also acts as a device belonging to the WVAN. The other devices 22 to 25 which are distinguished from the regulator 21 can start the stream connection.

One of the differences of the WVAN shown in FIG. 3 from the WPAN of FIG. 1 is that it supports two kinds of physical layers (PHY). That is, the WVAN supports a high-rate physical layer (HRP) and a low-rate physical layer (LRP) as physical layers. HRP is a physical layer capable of supporting a data transmission rate of 1 Gb / s or higher, and LRP is a physical layer supporting a data transmission rate of several Mb / s. The HRP is highly directional and is used for transmitting isochronous data streams, asynchronous data, MAC commands and A / V control data through a unicast connection. LRP supports directional or omni-directional mode and is used for beacon, asynchronous data, and MAC command transmission through unicast or broadcasting. The regulator 21 may transmit data to or receive data from another device using HRP and / or LRP. Other devices 22-25 of the WVAN may also transmit or receive data using HRP and / or LRP.

4 is a diagram for explaining frequency bands of HRP channel and LRP channels used in WVAN. HRP uses four channels of the 2.0 GHz bandwidth in the 57-66 GHz band, and LRP uses three channels of the 92 MHz bandwidth. As shown in FIG. 4, the HRP channel and the LRP channel share a frequency band and are used separately by the TDMA scheme.

5 shows an example of the structure of a superframe used in the WVAN. 5, each superframe includes a beacon region in which beacons are transmitted, a reserved region allocated to arbitrary devices by a coordinator according to a request of the devices, And an unreserved region for transmitting / receiving data according to a contention scheme between the device and the device, and each region is time divided. The beacon includes timing allocation information in the superframe, management of WVAN, and control information. The reserved area is used by the coordinator to allocate the channel time according to the channel time allocation request of the device, so that the allocated device is used to transmit data to another device. Commands, data streams, asynchronous data, and the like may be transmitted through the reserved area. An HRP channel is used when a specific device transmits data to another device through a reserved area, and an LRP channel is used when a device receiving the data transmits an acknowledgment (ACK / NACK) signal to the received data. The non-reserved area can be used to transfer control information, MAC commands or asynchronous data, etc. between the regulator and the device or between the device and the device. A CSMA (Carrier Sense Multiple Access) scheme or a slotted Aloha scheme can be applied to prevent data collision between devices in a non-reserved area. In the non-reserved area, data can be transmitted only through the LRP channel. If there are many control information or commands to be transmitted, it is also possible to set a reserved area in the LRP channel. The length and the number of the reserved area and the non-reserved area in each super frame may be different for each super frame and are controlled by the adjuster.

6 is a diagram for explaining another example of a superframe structure used in the WVAN. Referring to FIG. 6, each superframe includes an area 30 in which a beacon is transmitted, a reserved channel time block 32, and an unreserved channel time block 31 time block. Each channel time block (CTB) is time divided into an area (HRP area) through which data is transferred through the HRP and an area (LRP area) through which data is transmitted through the LRP. The beacon 30 is periodically transmitted by the arbitrator to identify the beginning of each superframe and 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.

In the HRP area, the reserved CTB area may be used by a device allocated by a coordinator to allocate a channel time according to a channel time allocation request of a device to transmit data to another device. When a specific device transmits data to another device through the reserved CTB area, the HRP channel is used. When the device receiving the data transmits an acknowledgment signal (ACK / NACK) signal to the received data, the LRP channel Can be used.

The non-reserved CTB area may be used to transmit control information, MAC commands or asynchronous data, etc. between the regulator and the device or between the device and the device. A Carrier Sense Multiple Access (CSMA) scheme or a slotted Aloha scheme may be applied to prevent data collision between devices in the non-reserved CTB area. In the non-reserved CTB area, data can be transmitted only through the LRP channel. If there are many control information or commands to be transmitted, it is also possible to set a reserved area in the LRP channel. The length and number of reserved CTBs and non-reserved CTBs in each superframe may differ from superframe to superframe and are controlled by an arbiter.

Also, although not shown in FIG. 6, it includes a contention-based control period (CBCP) located after the beacon to transmit an urgent control / management message. The section length of the CBCP is set so as not to exceed the threshold value by setting a certain threshold (mMAXCBCPLen).

7 is a diagram showing a protocol layer structure implemented in a device of a WVAN.

Referring to FIG. 7, the communication module of each device included in the WVAN can be divided into four layers according to its functions, and generally includes an adaptation sublayer 40, a MAC layer 41, A PHY layer 42, and a station management entity (SME) 43. Here, a station is a device for distinguishing from a regulator, and a station management entity (SME) has the same meaning as a device management entity (DME). The SME is a layer independent entity that controls a lower layer and collects device status information from each layer. The SME is responsible for managing each layer of the device communication module An entity managing the MAC layer is referred to as an MLME (Media Layer Management Entity), and an entity managing the adaptation layer is referred to as an Adaptation Layer Management Entity (ALME).

The adaptation sublayer 40 may include an AVC protocol and an A / V packetizer. The AVC protocol (Audio Video Layer) 400 is an upper layer responsible for streaming connection and device control for A / V data transmission between a transmitting device and a receiving device, and the A / V packetizing device 410 is an HRP data Format A / V data for service.

The MAC layer 41 is a lower layer of a data transmission protocol, and is responsible for functions such as link setup, connection or connection, channel access, and reliable data transmission. That is, it plays a role of transmitting a control / data message or controlling a channel.

The PHY layer 42 may directly process the A / V data or may be processed by the MAC layer 31 at the same time. The PHY layer is responsible for switching the requested message from the upper layer such as the adaptation layer 30 and the MAC layer 41 to take charge of the wireless signal so that the request message can be transmitted between the devices by the physical layer do. The PHY layer includes two types of physical layers of the HRP 420 and the LRP 421 described above.

The layer of the device provides services such as a high rate service, a low rate service and a management service. High-speed data services are used for video, audio, and data transmission, and low-speed data services are used for audio data, MAC commands, and small amounts of asynchronous data transmission. A simple message is exchanged between the layers before the process of data exchange. A message sent between different layers is called a primitive.

In order to perform wireless communication between devices in a wireless network, any device must be allocated channel resources from a regulator. The arbitrator performs a channel search operation for searching for a channel having the minimum interference ratio when a channel allocation request for transmitting A / V data is transmitted from an arbitrary device to another device. When a channel resource is available, a channel resource of a certain range is allocated to a device requesting channel allocation, and a device that is allocated channel resource from the arbiter may transmit data to another device of the wireless network using the allocated channel resource.

8 is a flowchart illustrating an example in which a transmitting device of a WVAN allocates channel resources from a coordinator and transmits data to a receiving device.

Referring to FIG. 8, in order to allocate channel resources for data transmission, the transmitting device transmits a channel resource request message (Bandwidth Request command) to the coordinator (S10). Upon receiving the channel resource request message, the coordinator searches for available channel resources to be allocated to the transmitting device (S11). If there is an available channel resource as a search result, the regulator transmits a bandwidth response command to allocate the requested channel resource to the transmitting device (S12). Then, the regulator transmits information about the type, range, and the like of the channel resource to be newly allocated to the transmitting device via the beacon (S13). At this time, other devices including the receiving device belonging to the WVAN receive information that a certain amount of channel resources are allocated from the arbitrator to the transmitting device through the beacon broadcast by the arbitrator.

The transmitting device, which has been allocated a certain amount of channel resources from the arbiter, transmits the A / V data to the receiving device through the allocated channel resources (S14). At this time, the A / V data is transmitted through the reserved area in the superframe of the allocated channel resources, and other control information, asynchronous data, and the like are transmitted through the non-reserved area. The receiving device receiving the A / V data from the transmitting device transmits an acknowledgment (ACK / NACK) signal to the transmitting device (S15). The ACK signal is an acknowledgment signal transmitted to the transmitting device by the receiving device indicating that the signal transmitted by the transmitting device has been normally received. When the transmitting device receives the ACK signal, it can transmit the next data. On the other hand, the NACK signal is an acknowledgment signal for indicating that the receiving device can not normally receive a signal transmitted from the transmitting device, such as a signal loss, an error, etc., and the transmitting device transmits data that was not normally received at the time of receiving the NACK signal It must be retransmitted.

In general, a device requests a channel resource allocation to a coordinator, specifies a schedule type of a channel resource allocated from a coordinator, and includes the channel resource request message in the channel resource request message. The schedule type of the channel resource can be classified into a static schedule type and a dynamic schedule type according to the characteristics of a channel time block (CTB) included in a super frame. The static schedule type consecutively allocates superframes including at least one CTB of the same size for data transmission which must be continuously transmitted for a predetermined time, such as A / V data, and the same number of CTBs . On the other hand, the dynamic schedule type is for temporary transmission of data such as beam search and control message change, and the size of each super frame does not have to be the same, so there is no restriction on the number of CTBs included in each super frame.

In FIG. 8, a channel resource request command (Bandwidth Request command) is for requesting allocation, change, or termination of channel resources to a coordinator in order for a transmitting device to perform a process related to data transmission to a coordinator or another device. The channel resource request command packet includes an area for indicating n channel resource request items, and one channel resource request item area may have a data format as shown in Table 1.

Octets: 1 One One One One 2 2 2 One TrgtID Stream request ID Stream Index Minimum number of time blocks Maximum number of time blocks Time Block Duration Minimum schedule period Maximum schedule period Request Control

Referring to Table 1, the channel resource request item region includes a TargID field indicating an ID of a device requesting channel resource allocation, a stream request ID field indicating a type of request message of the device, a stream index allocated by the coordinator A minimum number of time blocks field indicating a minimum number of channel resources included in one super frame, a maximum number of time blocks field indicating a maximum number of channel resources, (Time Schedule Duration field) indicating a duration of a channel resource, a minimum schedule period field indicating a minimum schedule period, a maximum schedule period field indicating a maximum schedule period, And a Request Control field including a Request Control field.

The stream index area indicates a stream index determined by the arbiter. For each stream in the WVAN, the arbiter assigns a unique stream index according to the data or traffic type the device is to transmit. For example, when a device requests an isochronous stream, the stream index field is set to an unassigned stream index. When the device requests reservation or termination of a channel resource for an asynchronous stream, the stream index field is set to a value for transmitting an asynchronous stream.

The minimum number of time blocks indicating the minimum number of channel resources may be a channel resource (e.g., a channel time block) requested in one superframe when the device requests channel resources to transmit isochronous data, And indicates the total number of channel resources included in one superframe when requesting channel resources for transmitting asynchronous data.

The maximum number of time blocks indicating the maximum number of channel resources indicates a maximum number of channel resources requested by the device when the device requests channel resources for isochronous data transmission. The area is reserved for transmission of other data or the like.

A time block duration indicating the duration of the channel resource indicates a time duration in which each of the plurality of channel resource blocks included in the schedule lasts in the schedule.

The minimum schedule period indicates a minimum value of the interval between the start of the first channel resource block and the start of the second channel resource block when two channel resource blocks are consecutively allocated. .

When a device requests channel resources for isochronous data, a maximum schedule period indicates a maximum schedule period. When two channel resource blocks are consecutively allocated, a second channel resource block This indicates the maximum value of the interval up to the start of the block. On the other hand, when the device requests channel resources for asynchronous data, it indicates the time at which the first channel resource block allocated in the superframe starts.

The request control field specifies a schedule type of channel resources, a type of a physical layer, and the like allocated by the coordinator. For example, if one bit is allocated to indicate the schedule type, the static schedule type can be set to 1 and the dynamic schedule type can be set to 0.

In this manner, the device can request allocation of channel resources to the regulator by specifying a type, a type, an allocated time, and the like of the channel resource to be allocated.

Upon receiving the channel resource request command, the arbiter may transmit a channel resource response command (Bandwidth response command) after searching for an available channel to be allocated to the device. The channel resource response command includes n channel resource response items that are responses to n channel resource request items included in the channel resource request command. Here, the channel resource response item area may be configured with a data format as shown in Table 2. [

Octets: 1 One One Stream Request ID Stream Index Reason Code

Referring to Table 2, an example of a channel resource response item field indicates a stream request ID and a stream index specified in a channel resource request command received from a device. A stream request ID field, a stream index field, and a reason code (Reason Code). The reason code specifies a code indicating whether the regulator can allocate the channel resource according to the request of the device and the reason why the channel resource can not be allocated. For example, in the Reason Code field, when a channel resource search result available channel of the coordinator exists, a channel resource can be allocated and a handover is being performed when a 0x0000 code is written or an additional channel resource request is made in the device. It is possible to transmit a code 0x02 indicating a cause of the channel resource unavailability indicating that handover is being performed.

When the coordinator allocates a certain range of channel resources to the device, it transmits allocation information of new channel resources to the device through the beacon.

Generally, the beacon is transmitted through an omni-directional Low-Rate Physical Data Unit (LRPDU) in a non-encrypted state, and the beacon includes scheduled timing information, management and control information of the WVAN. The beacon data packet includes a MAC control header, a beacon control field, an area indicating Schedule information of n (Schedule IE field), and the like. Generally, an information element (IE) data format is composed of an IE index, a length of an IE signal, and an area containing information to be transmitted. The Schedule IE indicates the time information of the schedule in the next superframe. For example, the Schedule IE included in the N-th beacon indicates time information regarding the superframe starting with the (N + 1) -th beacon. The Schedule IE includes n schedule blocks, and each schedule block includes index information of a stream to which the schedule is allocated, a schedule period, the number of channel time blocks allocated to one schedule, a time at which the first channel time block of the schedule starts Information, and interval information in which each channel time block is continued.

The beacon control field includes a beacon status area, a superframe time information area for specifying time information on successive beacon transmission intervals, and an area for indicating the number of superframes. The data packets in the beacon status area included in the beacon control area are configured as shown in Table 3.

Bits: 1 One One One One 3 Free channel time Configuration change Schedule change Static schedule Accepting commands Reserved

Referring to Table 3, an example of the beacon state information area includes a free channel time field indicating information on the availability of available channel resources according to a channel resource request, an area indicating the number of superframes, A configuration change field indicating whether to change the channel resource setting specified in the beacon, a schedule change field indicating whether the channel resource scheduling is changed on the current superframe in comparison with the previous beacon, An Accepting Commands field indicating whether to accept a channel resource allocation request, and a reserved area (Reserved) field for transmitting other data or the like field.

In Table 3, the free channel time region may be set to '1' when the coordinator allocates channel resources and may be set to '0' when it is determined not to allocate new channel resources. The channel resource setting change information area may also be set to 0 if there is no change. The static schedule area need not be included in all beacons in order to reduce the overhead generated by the beacons, but a static schedule IE may be included periodically. Similarly, if there is no static schedule IE included in the current beacon, the static schedule area is set to 0, and the accepting command area may also be set to 0 when the arbiter rejects the channel allocation request of the device.

In step S14, the transmitting device having the channel resource allocated thereto forms the WVAN network with another device and transmits the data to the receiving device through the allocated channel resource. Similarly, an ACK / NACK signal for the data is received from the receiving device (S15). Specifically, the transmitting device transmits a signal to the receiving device via the superframe structure shown in Fig. 5, and an example of a superframe structure used by the WVAN device according to steps S14 and S15 will be described with reference to Fig. 9 .

9 is a diagram illustrating an example of a power mode of a receiving device according to a superframe structure used in a WVAN.

Referring to FIG. 9, one superframe includes one or more reserved areas (B ₁ , B ₂ ,...) Using a channel resource allocated from a coordinator, a beacon transmission area, And is time-divided into one or more unoccupied areas (A ₁ , A ₂ , ...) that transmit and receive signals according to a contention scheme. The channel resource allocated from the coordinator may include one or more channel time blocks (CTBs). As described above, the channel resource can be allocated to the transmitting device by requesting the channel resource to the arbitrator.

The transmitting device transmits the data packet to the receiving device through the HRP channel, and the receiving device transmits the ACK / NACK signal of the data packet received to the transmitting device through the LRP channel. The ACK / NACK signal may also be transmitted through an HRP channel. At this time, the receiving device sets the power mode of the receiving device to the normal mode, which is the 'Power On' state, in order to exchange signals with the transmitting device.

Unlike the reserved area in which the channel resource is allocated by designating a specific device by the regulator, the non-reserved area is a section in which control signals, data, and the like can be transmitted and received according to a competition method between the devices. Since the receiving device receives in advance the information on the channel resource period and the reserved area / non-reserved area allocated to the transmitting device via the beacon signal broadcast by the arbitrator, the power mode of the receiving device is changed from 'Power Off 'mode or' Power Save 'mode.

Hereinafter, the power mode in the 'Power On' state will be referred to as a 'normal mode' and the power mode in the 'Power Off' state or the 'Power Save' state will be referred to as a 'power saving mode'.

In the case where the transmitting device fails to complete the transmission of the data packet within the reserved area (B ₁ ) because the receiving device sets the power mode to the normal mode only in the reserved area. The transfer of remaining data packets is restricted in the non-reserved area (A ₂ ) continuous to the reserved area (B ₁ ). Alternatively, when the NACK signal is received from the receiving device with respect to the data packet transmitted by the transmitting device and the corresponding data packet is retransmitted, the predetermined data transmission amount in the reserved area within a certain range can not be satisfied.

In this case, since the transmitting device performs data transmission through the next reserved area (B ₂ ) instead of the non-reserved area (A ₂ ), the transmission time is delayed or the buffering time required for data reproduction increases.

One embodiment of the present invention relates to a method of transmitting data using a non-reserved area of a super frame in a WVAN device, and will be described with reference to FIG.

10 is a flowchart illustrating a method of transmitting data by extending a channel resource range allocated from a coordinator in a WVAN according to an embodiment of the present invention.

Referring to FIG. 10, a transmitting device transmits A / V data to a receiving device using channel resources allocated from a regulator (S20), and receives an acknowledgment (ACK / NACK) signal for the corresponding data from the receiving device (S21). This process is repeated within the reserved area using the channel resources allocated from the coordinator. At this time, data transmission may not be performed within a limited range of reserved areas, or data may be lost during transmission. For example, if the capacity of the data that the sending device wants to transfer to the receiving device is greater than expected when the device requests channel resource allocation to the regulator, or if data loss occurs in the transmission process, There may be cases where it is not completed.

In the case of data that is time-limited to be transmitted continuously such as video data, according to an embodiment of the present invention, the transmitting device transmits channel time extension information to the receiving device (S22). The channel time extension information is an extension of the channel resource by requesting the transmission device to expand the CTB currently used for data packet transmission. Therefore, in the present invention, the channel time extension information and the channel time extension information have the same meaning. The transmitting device transmits the channel time extension information to the receiving device in order to transmit data through the CTB of the non-reserved area continuous to the channel resource reservation area in which the data is transmitted in steps S20 and S21.

The receiving device receiving the channel time extension information can maintain the power mode, which was the normal mode in the reserved area, in the non-reserved area to receive data from the transmitting device (S23). At this time, the receiving device does not have to maintain the power mode in the normal mode according to the request of the transmitting device, but can switch to the power saving mode according to the selection of the receiving device.

As the receiving device keeps the power mode in the normal mode for a certain period in the non-reserved area, the transmitting device retransmits the remaining data (S24). Then, an ACK / NACK signal for the data is received from the receiving device (S25).

According to an embodiment of the present invention, the channel time extension information may be included in a MAC header of a data packet transmitted by a transmitting device and transmitted to a receiving device, and will be described with reference to FIG. 11 and FIG. However, the transmission format of the channel time extension information to be described later will be described as an example of a MAC control header data format, but may be included in a field other than the MAC header of the data packet or may be transmitted as an independent radio signal.

11 is a diagram showing an example of the data format of the MAC header of the WVAN.

Referring to FIG. 11, the WVAN data packet includes a MAC header 50 and a packet body field 51 including a plurality of subpackets. The data packet can be used with the same meaning as the MAC packet. The MAC header 50 is further subdivided into a MAC control header 510, a MAC extension header 520, a security header 530, a video header 540, a CP header 55 and a reserved area 560. The MAC header shown in FIG. 11 is a MAC header included in data transmitted through the HRP channel.

The MAC extension header 520 includes information on a link having a fast transmission speed, information on an HRP mode and an LRP mode, and one or more ACK groups. The ACK group corresponds to each of the subpackets included in the packet body field.

The security header 530 includes information for identifying a key used for encrypting or authenticating data transmitted through a packet. The CP header 550 is used to transmit content protection information for a packet. The CP header format can be variously implemented according to a content protection method used for the corresponding data.

The channel time extension information according to an embodiment of the present invention may be included in the MAC control header 410 and will be described with reference to FIG.

12 is a diagram illustrating an example of a MAC control header data format according to an embodiment of the present invention.

12, an example of the MAC control header 510 includes a packet control field 511, a DestID field 512 for setting an ID of a transmitting device to which A / V data is to be transmitted in the WVAN, A WVAN ID field 514, a stream index field 515, and a reserved area 517 for identifying the WVAN network in which the devices are included, a SrcID field 513 for setting an ID of a receiving device that receives A / V data, .

In the case where the transmitting device intends to expand the CTB used for the current data transmission according to an embodiment of the present invention, for any one of a plurality of data packets transmitted through the CTB of the reserved area, A portion of the area 517 may be defined as a channel time extension (CTE) field 516 and include the channel time extension information.

When 1 bit is allocated to the CTE field, channel time extension information may be transmitted as '0' or '1'. For example, if the data corresponding to the CTE field is '1', it indicates that the CTB currently used by the transmitting device is extended to a part of the non-reserved area. If the data is '0', the CTB is not used in the non- . In order for the transmitting device to use the CTB of the non-reserved area continuously in the reserved area, the channel time extension information must be transmitted before the reserved area ends. Therefore, when the data of the CTE field of the MAC packet received by the receiving device is '1', the receiving device can maintain the power mode of the receiving device in the normal mode until receiving the next MAC packet from the transmitting device. As the receiving device maintains the power mode in the normal mode for a predetermined period in the non-reserved area, the transmitting device can transmit data or perform a beam serching process in the corresponding section. However, even if the receiving device receives the channel time extension information having the data of the CTE field '1' from the transmitting device, the receiving device can switch the power mode to the power saving mode according to the receiving device selection.

The channel time extension information for CTB extension can be used to change the data '1' and '0' of the CTE field described above. Alternatively, two or more bits may be assigned to the CTE field, in which case more specific channel time extension information may be transmitted.

Below. 13 to 15 are views showing an example of a superframe structure in a WVAN according to an embodiment of the present invention.

Referring to FIG. 13, when a transmitting device transmits one or more data packets through a HRP channel to a receiving device in a reserved area, the receiving device transmits an ACK / NACK signal for the received data packet through the LRP channel. At this time, the transmission if the device is in a first reserved area (B ₁₎ CTB data packet (Data4) fails to complete transmitted on that are included in, the last data packet (Data3) transmitted in the reserved area (B ₁₎ MAC control header Quot; 1 " data in the CTE field of " 1 " The receiving device that has received the data packet Data3 maintains the power mode in the normal mode even in the channel resource period set as the non-reserved area. Accordingly, the transmitting device can transmit the data packet Data4 using the CTB of the non-reserved area. Next, when the CTE data of the transmitted data packet Data 4 is '0', the transmitting device no longer uses the CTB of the unoccupied area, and the receiving device transmits the ACK / NACK signal to the transmitting device C). In the subsequent non-reserved area, the power mode of the receiving device can be switched to the power saving mode, and the transmitting device transmits the remaining data packet through the CTB of the next reserved area (B ₂ ).

14 is a diagram showing another example of a superframe structure in a WVAN according to an embodiment of the present invention.

Referring to FIG. 14, when the transmitting device sets the CTE information to '1' in the MAC control packet of the last data packet Data2 transmitted using the CTB of the reserved area B ₁ and transmits it to the receiving device, The receiving device maintains the power mode in the normal mode so that the transmitting device can use the CTB of the non-reserved area. In this case, when a part of the data packet is lost or an error occurs in the transmission process and the acknowledgment signal is a NACK signal, the transmitting device retransmits the same data packet through the extended channel resource interval in the non- The next data packet can be transmitted in a lost state. In Fig. 14, the transmitting device that has received the NACK signal retransmits the same data packet Data2. At this time, since the CTE information accompanying the data packet Data2 is '1', the receiving device maintains the power mode in the normal mode, and the transmitting device transmits the next data packet Data3. At this time, if the CTE information included in the data packet Data3 is '0', the transmitting device no longer uses the CTB of the unoccupied area, and the receiving device switches to the power saving mode in the subsequent unoccupied area. Therefore, the CTB used by the transmitting device is extended by the C section.

15 is a diagram showing another example of a superframe structure in a WVAN according to an embodiment of the present invention.

15, the transmitting device sets the channel time extension information included in the last data packet (Data2) transmitted in the reserved area to '1' in the same manner as in the above embodiments, and transmits the use of the CTB included in the non- Lt; / RTI > The channel time extension information may also be included in the data packet Data3 transmitted in the non-reserved area. Upon receiving the channel time extension information set to '1', the receiving device maintains the power mode in the normal mode in the CTB in which the data packet is transmitted. At this time, the transmitting device may perform beam searching in the non-reserved area CTB of the normal mode. If the transmitting device is no longer required to use the CTB in the non-reserved area, the channel time extension information is set to '0', and the transmitting device switches the power mode to the power saving mode in the remaining unreserved area.

13 to 15, when the receiving device receives the channel time extension information and switches the power mode to the power saving mode, the transmitting device uses the CTB of the next reserved area (B ₂ ) It is possible to transmit the data packet and then attempt to expand the CTB usage range for the unoccupied area A ₃ .

Next, with reference to FIG. 16, a method of transmitting a response message to channel time extension information in a receiving device with respect to utilization of a non-reserved area of a WVAN super frame according to another embodiment of the present invention will be described.

16 is a flowchart illustrating an exemplary method of transmitting data by extending a channel resource range allocated in a WVAN according to another embodiment of the present invention.

Referring to FIG. 16, steps S20 to S22 of transmitting channel time extension information while transmitting A / V data to a receiving device through a reserved area of a WVAN superframe using a channel resource allocated by a transmitting device 10 is the same as the process shown in FIG. According to another embodiment of the present invention, the receiving device receiving the channel time extension information for CTB extension currently used from the transmitting device determines whether to adjust the power mode according to the received information (S30). When the receiving device determines whether to maintain the normal mode or the power saving mode according to the receiving device status, it generates a response message based on the determination. Then, the generated response message is transmitted to the transmitting device (S31). Thereafter, when the transmitting device transmits data to the receiving device (S32), when receiving a response message indicating that the power mode is to be maintained in the normal mode according to the channel time extension information from the receiving device, the data transmission through the non- . On the other hand, when the transmitting device receives a response message indicating that the receiving device should switch from the receiving device to the power saving mode, data transmission is performed through the next reserved area.

The response message can be included in a transmission data ACK / NACK signal transmitted to the transmitting device by the receiving device, and will be described with reference to FIG.

17 is a diagram illustrating an example of a data packet in which a response message according to channel time extension information is transmitted according to another embodiment of the present invention.

Generally, data transmission / reception between devices in a WVAN is performed through an HRP channel, and transmission / reception of a beacon or an ACK / NACK signal is performed through an LRP channel. According to another embodiment of the present invention, the receiving device may also transmit the ACK / NACK signal through the HRP channel and the HRP ACK packet as shown in FIG.

The HRP ACK packet transmitted by the receiving device that receives the A / V data from the transmitting device is composed of the MAC control header field 60 and the HRP ACK header field 61.

An example of the MAC control header 60 includes a Packet Control field 601, a DestID field 602 for setting an ID of a receiving device to which an ACK / NACK signal is to be transmitted in the WVAN, an ACK / A SrcID field 603 for setting the ID of the transmitting device to be received, a WVAN ID field 604 for identifying the WVAN network including the devices, a stream index field 605, and other extra data Area 607. [0060] The receiving device, which has determined that it is based on the channel time extension information transmitted from the transmitting device, allocates a part of the reserved area 607 to the 'CTE Confirm (CTEC)' field 606 for transmitting the response information according to the channel time extension information can do. The CTEC field is referred to for convenience of description, and the field for transmitting the response information to the channel time extension information may be referred to as another name.

When 1 bit is allocated to the CTEC field, it is possible to transmit the channel resource extension from the receiving device to the non-reserved area determined as '0' or '1'. For example, if the data corresponding to the CTEC field is '1', the receiving device maintains the power mode in the normal mode according to the channel time extension information and indicates a state of preparing for data reception. On the other hand, in case of '0', the channel resource range is not extended, and the receiving device indicates that it will switch to the power saving mode after transmitting the corresponding ACK signal. Contrary to the above example, it is also possible to indicate the transition to the power saving mode when the data is '1', and to indicate the maintenance of the normal mode when the data is '0'.

In addition, when more bits are allocated to the CTEC field, the response type of the receiving device may be more variously represented. In the case of rejecting the channel resource extension request of the transmitting device, the cause of rejection may also be indicated.

In this manner, if the receiving device responds to the transmitting device with a determination result according to the channel time extension information, the transmitting device can prepare for data transmission through the next reserved area without repeating the same request.

18 is a diagram illustrating an example of a superframe structure in a WVAN according to another embodiment of the present invention.

Referring to FIG. 18, the receiving device may transmit an accept or reject response message to the HRP ACK signal on the HRP channel for the channel time extension information (CTE = 1) transmitted from the transmitting device.

The transmission device transmits channel time extension information (CTE = 1) including the channel time extension information (CTE = 1) to the MAC header of the data packet Data2 finally transmitted through the CTB of the reserved area (B ₁ ) When the power mode is to be adjusted, a response signal (CTEC = 1) is transmitted to the MAC header of the ACK signal for the transmitted data packet Data2. The CTEC data is '1' indicating that the power mode of the receiving device is maintained in the normal mode according to the channel time extension information of the transmitting device, as described above. Therefore, the transmitting device can transmit the data packet Data3 by expanding the channel resources up to some CTBs (section C) of the non-reserved area.

Referring to FIG. 18, when the receiving device does not wish to comply with the channel information extension information, the CTE field data of the MAC header of the last data packet Data _{5 in the} reserved area B ₂ is set to '1' , The receiving device can set the CTEC field data included in the MAC header of the ACK signal for the transmitted data packet Data 5 to '0' and transmit the CTEC field data. That is, the non-reserved area is started and a response is made to switch the power mode of the receiving device to the power saving mode.

The response message transmitted from the receiving device to the transmitting device may be included in the ACK / NACK signal through the LRP channel. In this case, the response message may be transmitted in the MAC control header of the omni ACK packet over the LRP channel. The data format of the MAC control header is the same as the data pocket described in Fig. 17, and a description thereof will be omitted.

The response message is transmitted not only through the ACK / NACK signal but also through another signal, and may be included in another field in the ACK / NACK signal.

In this manner, when the receiving device transmits another response message to the transmitting device, the transmitting device can accurately confirm the power mode of the receiving device, thereby reducing the error occurrence rate.

19 is a diagram illustrating an embodiment of a broadcast signal processing system including a device of a wireless network according to an embodiment of the present invention.

The device of the wireless network can reproduce the A / V data received from the broadcasting station or the cable satellite via the antenna through the following process. In addition, when the device operates as a source device or a transmitting device on a wireless network, the device can remotely transmit the received A / V data to at least one sink device or a receiving device.

19, a broadcasting signal processing system including a WVAN transmitting device according to an embodiment of the present invention includes a transmitting device 70, a remote controller 71, a local storage 72, a receiving device 74 And a network device 73 for performing wireless communication with the network device.

The transmitting device 70 for transmitting the A / V data includes a receiving unit 701, a demodulating unit 702, a decoding unit 703, a display unit 704, a controller 705, a channel resource control module 706, A processing unit 707, a transmission unit 708, and a control signal communication unit 709. [ In the example of FIG. 19, the transmitting device further includes a local storage 72, which discloses an example where the local storage 72 is connected directly to a transmitter 708 including an input / output port, Lt; RTI ID = 0.0 > 70 < / RTI >

The transmitting unit 708 can communicate with the wired or wireless network device 73 and can be connected to at least one receiving device 74 existing on the wireless network through the network device 73. [ The control signal communication unit 709 receives the user control signal according to a user control device, for example, a remote controller, and outputs the received signal to the control unit 705. [

The receiving unit 701 may be a tuner that receives a broadcast signal of a specific frequency through at least one of a terrestrial wave, a satellite, a cable, and the Internet. The receiving unit 701 may be provided for each of a broadcast source, for example, a terrestrial wave, a cable, a satellite, and a personal broadcasting, or may be an integrated tuner. If the receiver 701 is a tuner for terrestrial broadcasting, it may include at least one digital tuner and an analog tuner, or a digital / analog integrated tuner.

Also, the receiving unit 701 may receive an IP (Internet Protocol) stream transmitted through wired / wireless communication. When receiving the IP stream, the receiving unit 701 can process the transmission / reception packet according to the IP protocol that sets the source and destination information for the received IP packet and the packet transmitted by the receiver. The receiving unit 701 can output the video / audio / data stream included in the received IP packet according to the IP protocol, and can generate and output the transport stream to be transmitted to the network as an IP packet according to the IP protocol . The receiving unit 701 is a component for receiving an externally input video signal, and can receive, for example, a video / audio signal input in the IEEE 1394 format from the outside or a stream in a format such as HDMI.

According to an embodiment of the present invention, when a transmitting device transmits channel time extension information to a receiving device, the receiving device 701 may receive a response message for channel time extension information from the receiving device.

The demodulation unit 702 demodulates a broadcast signal transmitted from the receiving device 701 or a broadcast signal transmitted from the receiving device 701 in the reverse of the modulation scheme. The demodulation unit 702 demodulates the broadcast signal and outputs a broadcast stream. When the receiving unit 701 receives the stream format signal, for example, when receiving the IP stream, the IP stream bypasses the demodulation unit 702 and is output to the decoding unit 703.

The decoding unit 703 includes an audio decoder and a video decoder. The decoding unit 703 decodes a broadcast stream output from the demodulation unit 702 by a decoding algorithm, and outputs the decoded broadcast stream to the display unit 704. [ In this case, a demultiplexer (not shown) may be further provided between the demodulator 702 and the decoder 703 to separate the streams according to the corresponding identifiers. The demultiplexer demultiplexes a broadcast signal into an audio elementary stream ES and a video elementary stream ES and outputs them to respective decoders of the decoding unit 703. Also, when a plurality of programs are multiplexed on one channel, only a broadcast signal of a program selected by the user can be selected and divided into a video element stream and an audio element stream. If the demodulated broadcast signal includes a data stream or a system information stream, it is separated from the demultiplexer and transmitted to the corresponding decoding block (not shown).

The display unit 704 can display the broadcast content received from the receiver 701 and the content stored in the local storage 72. [ According to a control command of the controller 705, a menu for displaying information related to whether or not the storage device is mounted and remaining capacity is displayed and can be operated according to the control of the user.

The control unit 705 can control operations of the illustrated components (receiving unit, demodulation unit, decoding unit, display unit, graphics processing unit, network control module, interface unit) and the like. Then, a menu for receiving a user's control command is displayed, and an application for displaying various information and a menu of the broadcast signal processing system to the user can be driven.

For example, the control unit 705 may cause the content stored in the local storage 72 to be read when the local storage 72 is mounted. The control unit 705 can control to store the broadcast content received from the receiving unit 701 in the local storage 72 when the local storage 72 is mounted. In addition, the controller 705 may output a signal for controlling the local storage 72 to mount according to whether the local storage 72 is mounted.

The control unit 705 may check the remaining storage capacity of the local storage 72 and display the information on the display unit 704 to the user through the display unit 704 or the graphic processing unit 707 . If the remaining storage capacity of the local storage 72 is insufficient, the controller 705 may transfer the content stored in the local storage 72 to the remote storage device 72, for example. In this case, when the remaining storage capacity of the local storage 72 is insufficient, the controller 705 instructs the user to connect the local storage 72 to another local storage (not shown) or a remote storage via the display unit 704 A menu indicating whether or not to store the stored content is displayed. Then, the control signal of the user can be received and processed. Accordingly, the control unit 705 can move and store the contents stored in the local storage 72 and other storage devices directly or remotely mounted.

The channel resource control module 706 controls the transmitting device to extend channel resources up to a portion of the non-reserved area in addition to being allocated channel resources from the coordinator to transmit data from the WVAN to the receiving device. An example of the channel resource is a channel time, and the reserved area and the unreserved area are composed of one or more CTBs. In general, a transmitting device can transmit data from a coordinator to another device in a reserved area to which channel resources are allocated, and can use the corresponding interval in a non-reserved area according to a method of competing with other devices. Therefore, when the channel resource control module according to an embodiment of the present invention desires to transmit data through the unallocated area, it controls to generate channel time extension information and transmit it to the receiving device. Accordingly, a non-reserved area can be utilized as a usage period of a specific device other than a method of competing with another device.

Meanwhile, the channel resource control method performed by the channel resource control module 706 may be performed by the controller 705. The channel resource control module 706 generates channel time extension information and transmits the channel time extension information to the receiving device through the transmitter If the receiving device adjusts the power mode accordingly, the control unit 705 can control to transmit data through the extended channel resources.

In FIG. 19, for convenience of explanation, the control unit 705 and the channel resource control module 706 are separately provided, but they may be implemented as one system chip as shown by a dotted line.

The graphics processing unit 707 may process graphics to be displayed so that a menu screen or the like can be displayed on the video image displayed by the display unit 704 and control the display unit 704 to display the processed graphics.

The transmitting unit 708 may transmit data to at least one receiving device 74 through a wired / wireless network, and may include an interface unit to perform bidirectional communication between the devices. When the channel resource is allocated from the arbitrator, the transmitting device transmits data or the like to the receiving device through the transmitting unit 708 within the allocated channel resource range.

The interface unit may interface with at least one second device 74 through a wired or wireless network and may include an Ethernet module, a Bluetooth module, a short-range wireless Internet module, a portable Internet module, a home PNA module, an IEEE1394 module, An RF module, and an IrDA module. Meanwhile, the transmitting unit 708 may output a control signal for turning on the power to the remote storage device. For example, although not shown in FIG. 19, the transmitting unit 708 may transmit a WOL signal to a network interface unit through which a separate remote storage device communicates, thereby turning on a remote storage device.

The terms used above may be replaced by others. For example, the device may be changed to a user device (or device), a station, etc., and the regulator may be an adjustment (or control) device, a tuning (or control) device, a tuning (or control) station, a coordinator ), A piconet coordinator (PNC), and the like. Further, a device for allocating a channel resource of a certain range from the arbitrator to transmit data to another device may be changed to a transmitting device or the like in relation to an "Originator" or a device receiving the data, May be changed to a receiving device or the like in relation to a "Target" or a device transmitting the data. In addition, the data packet can be used as a data block or a data unit.

It will be understood by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are in all respects illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1 shows a configuration example of a WPAN.

2 shows an example of a superframe used in a piconet.

Fig. 3 shows an example of the configuration of the WVAN.

4 is a diagram for explaining frequency bands of HRP channel and LRP channels used in WVAN.

FIG. 5 shows an example of a superframe structure used in a WVAN.

6 is a diagram for explaining another example of the superframe structure used in the WVAN.

7 is a diagram showing a protocol layer structure implemented in a device of a WVAN.

8 is a flowchart illustrating an example in which a transmitting device of a WVAN allocates channel resources from a coordinator and transmits data to a receiving device.

9 is a diagram showing an example for explaining a power mode of another receiving device in the superframe structure used in the WVAN.

10 is a flowchart illustrating an exemplary method of transmitting data by extending a channel resource range allocated in a WVAN according to an embodiment of the present invention.

11 is a diagram showing an example of a MAC header data format of a WVAN.

12 is a diagram illustrating an example of a MAC control header data format according to an embodiment of the present invention.

13 is a diagram illustrating an example of a superframe structure in a WVAN according to an embodiment of the present invention.

14 is a diagram showing another example of a superframe structure in a WVAN according to an embodiment of the present invention.

15 is a diagram showing another example of a superframe structure in a WVAN according to an embodiment of the present invention.

16 is a flowchart illustrating an exemplary method of transmitting data by extending a channel resource range allocated in a WVAN according to another embodiment of the present invention.

17 is a diagram illustrating an example of HRP ACK packet data format according to another embodiment of the present invention.

18 is a diagram illustrating an example of a superframe structure in a WVAN according to another embodiment of the present invention.

19 is a diagram illustrating an embodiment of a broadcast signal processing system including a WVAN device according to an embodiment of the present invention.

Claims (29)

A method for transmitting data in a transmitting device in a wireless network, Transmitting at least one data packet to a receiving device through a reserved area including channel resources allocated from a coordinator; And Transmitting channel time extension information to the receiving device to transmit a data packet through a non-reserved area in which the regulator does not allocate channel resources to a specific device, Wherein each of the one or more data packets includes a header comprising a channel time extension field and the channel time extension information is included in a channel time extension field of the last data packet of the one or more data packets. . The method according to claim 1, Wherein the channel resource comprises at least one channel time block. delete delete The method according to claim 1, And transmitting the data packet to the receiving device through the non-reserved area. The method according to claim 1, Further comprising receiving a response message according to the channel time extension information from the receiving device. The method according to claim 6, If the response message includes information that is acceptable for channel time extension, Wherein the transmitting device further comprises transmitting a data packet through the non-reserved area. delete delete delete A method for receiving data at a receiving device of a wireless network, Receiving at least one data packet from a transmitting device through a reserved area including channel resources allocated from a coordinator; And Receiving from the transmitting device channel time extension information for receiving a data packet through a non-reserved area in which the arbiter does not allocate channel resources to a specific device, Wherein each of the one or more data packets includes a header comprising a channel time extension field and the channel time extension information is included in a channel time extension field of the last data packet of the one or more data packets. . 12. The method of claim 11, Wherein the channel resource comprises one or more channel time blocks. delete delete 12. The method of claim 11, Further comprising not switching the power mode to the power saving mode in response to the received channel time extension information. 16. The method of claim 15, Further comprising the step of receiving a data packet from the transmitting device through the non-reserved area. 12. The method of claim 11, And switching the power mode to the power saving mode in response to the received channel time extension information. delete 12. The method of claim 11, Further comprising the step of transmitting a response message for the channel time extension information to the transmitting device. 20. The method of claim 19, If the response message includes information indicating that the power mode is not switched to the power saving mode, Further comprising the step of receiving a data packet from the transmitting device through the non-reserved area. delete delete delete A transmitting device for transmitting data in a wireless network, A transmitter for transmitting at least one data packet to a receiving device through a reserved area including channel resources allocated from the arbiter; A channel resource control module for generating channel time extension information for transmitting a data packet through a non-reserved area in which the arbiter does not allocate channel resources to a specific device and controlling the channel time extension information to be transmitted to the receiving device; And And a control unit for controlling whether the data packet is transmitted to the receiving device, Wherein each of the one or more data packets comprises a header comprising a channel time extension field and the channel time extension information is included in a channel time extension field of the last data packet of the one or more data packets. 25. The method of claim 24, And a receiving unit, Wherein the receiving unit receives a response message for the channel time extension information from the receiving device. 26. The method of claim 25, Wherein the control unit controls to transmit a data packet to the receiving device through the non-reserved area when the response message includes information to be accepted for channel time extension. 26. The method of claim 25, When the response message includes information rejected for the channel time extension, the control unit controls to transmit a data packet to the receiving device through a reserved area other than the reserved area to which the channel time extension information is transmitted / RTI > A receiving device for receiving data in a wireless network, A receiver for receiving channel time extension information for receiving at least one data packet from a transmitting device through a non-reserved area in which a regulator does not allocate channel resources to a specific device; And And a controller for controlling the power mode of the non-reserved area to be not switched to the power saving mode according to the channel time extension information, Wherein each of the one or more data packets comprises a header comprising a channel time extension field and the channel time extension information is included in a channel time extension field of the last one of the one or more data packets. 29. The method of claim 28, Further comprising a transmitter, Wherein the control unit generates a response message including information indicating that the power mode is not switched to the power saving mode and controls the transmission unit to transmit the response message to the transmission device.

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