KR20060066904A - Power effective mac and phy implementation for wireless personal area network device - Google Patents

Abstract

The present invention relates to a medium access control and a physical layer device for reducing power consumption in a personal wireless network, wherein the medium access control device according to the present invention is configured to maintain a super frame synchronization with a master of the private wireless network in a sleep mode. 1 block; A second block configured to perform contention period and allocation period processing of the super frame in an active mode; And a clock selector which provides a normal clock to the first block and the second block in an active mode, and provides a clock lower than the normal clock to the first block and does not provide a clock to the second block. According to the present invention, the power consumption can be further reduced by reflecting the operation characteristics of the functional blocks of the MAC hardware in the sleep mode, and the power consumption of the PHY hardware in the active mode.

Personal Wireless Network, Piconet, Master, Slave, Beacon, Super Frame, Assignment Section, Competition Section, Power, Sleep State, Active State, Instant Acknowledgment Frame

Description

Media access control and physical layer device to reduce power consumption in private wireless networks {POWER EFFECTIVE MAC AND PHY IMPLEMENTATION FOR WIRELESS PERSONAL AREA NETWORK DEVICE}

1 is an illustration of components of a private wireless network.

2 is an overall configuration diagram of a superframe.

3 is a block diagram of a competition section using the CSMA / CA method.

4 is a block diagram of an allocation slot in an allocation section.

5 is a timing diagram of transmission and reception in an active mode.

6 is a transmission and reception timing diagram illustrating switching between an active mode and a sleep mode.

7 is an overall structural diagram of hardware including MAC and PHY.

8 is a configuration diagram of MAC hardware.

9 is a clocked diagram of MAC hardware for reducing power consumption in sleep mode according to a first embodiment of the present invention.

10 is a transmission and reception timing diagram of an allocation interval for reducing power consumption in an active mode according to a second embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal wireless network. More specifically, the present invention relates to a medium access control layer (MAC), and a physical layer (PHY) to reduce power consumption in a personal wireless network. ) Hardware configuration of the device.

The IEEE 802.15 Working Group is setting the standard for personal wireless networks (WPANs), which consist of mobile computing devices in short-haul wireless networks such as PANs. Home Automation, Remote Control, and Ubiquitous There is a lot of movement to apply it to a sensor network (Ubiquitous Sensor Network).

In particular, the recently completed standard 802.15.3 is called HR-WPAN (High Rate-WPAN), and aims to be a wireless communication network suitable for applications requiring a high data rate of 55Mb / s or more. Short distance of 5m to 55m, data rate of more than 55 Mbps, dynamic topology configuration of network configuration devices, TDMA support for QoS guarantee of stream, peer-to-peer connectivity Peer Connectivity).

(Characteristics of Personal Wireless Networks)

A personal wireless network (WPAN) refers to a wireless ad hoc data communication system in which a plurality of independent stations can transmit general data, voice and multimedia data to each other. Such a system defines an individual's behavior radius, that is, all directions within 10 m, as its communication area, and can provide a data transmission service required by an individual, such as transmitting a voice data or a video stream or transmitting general data.

 The basic communication range of a personal wireless network is based on a short range personal area within 10 meters as described above, and may be a wired or wireless local area network such as a local area network (LAN), a city network (MAN), or a wide area network (WAN). It can work in conjunction with a wireless network such as Wireless LAN.

In general, in wired networks such as Ethernet, the addresses assigned to each station do not change, but the address in a private wireless network refers to the sending and receiving station of serviced data, typically without a fixed address. It is dynamically allocated according to the situation.

 Personal wireless networks, on the other hand, can serve fixed, portable and mobile devices. One important feature of portable and mobile devices is that the power source consists mainly of batteries. Accordingly, efficient power management technology is very important because of the limited power capacity of the battery, and the effective design of the protocol of the physical layer or data link layer as well as the component and circuit design is important to reduce power consumption.

(Components of a private wireless network)

1 illustrates a configuration of a personal wireless network, and elements constituting the personal wireless network may be roughly classified as follows. The most basic element is a station, and the Piconet is configured when there are two or more stations operating on the same radio frequency channel within the personal activity area. Stations are divided into master and slave according to their roles. The master manages the entire piconet and there can only be one in the piconet. The master controls the slave by broadcasting a beacon. The slave can transmit / receive data under the control of the master.

(Features of a private wireless network)

1. Network Synchronization

The piconet is started by the master sending a beacon packet. The beacon packet has reference information about the network, and all slaves in the piconet synchronize the network using the reference information in the beacon packet. As illustrated in FIG. 2, the superframe is composed of three parts, that is, a beacon period, a contention access period (CAP), and an contention free period (CFP), and the length of each period. Is variable.

First, in the beacon period, the master transmits a beacon packet having network reference information to the slaves.

In the contention period, the slave and the master transmit command packets such as network join request / disassociation request / allow, resource allocation request / allow, and connection request / allow in a random approach. During the contention period, since the exclusive access to the medium through the exclusive allocation of time by the master is not guaranteed, each station accesses the medium using the competitive CSMA / CA. Accordingly, when the station has a packet to send and the medium is empty for a backoff time, it transmits the packet.

3 illustrates in detail the timing of packet transmission / reception in the aforementioned contention period. Referring to FIG. 3, a contention period (CAP) starts in short inter-frame space (SIFS), which is one of inter-frame spacings (IFS), and short inter-frame (SIFS) between each data frame and ACK frame. frame space), thereby ensuring sufficient turnaround time between frame transmissions. The backoff period starts in the backoff inter-frame space (BIFS), and the frame is transmitted when the medium is empty during the backoff period. Meanwhile, a guard time exists to prevent collision between adjacent CTAs.

Referring back to FIG. 2, in the allocation interval CFP, a station allocated with a time slot by a time division multiple access (TDMA) scheme transmits synchronous / asynchronous data and a command packet during the corresponding slot. For example, in FIG. 2, n time slots CAT1, CTA2,..., CTA n-1 and CTA n are time-divisionally allocated to the allocation interval CFP of the mth superframe SF m. A guard time is inserted between slots.

During the allocation interval, each station has exclusive access to the medium for the time slots allocated to it. The master distributes time slots in the allocation intervals to each station. During the distributed time slots, each station has exclusive access to the media, and during the assigned slots, each station exchanges data 1: 1 with the station to which it wishes to exchange data without master intervention. The master specifies the start time, slot length, and transmit / receive station of each time slot in the beacon packet, ensuring that each station has exclusive access to the medium to transmit the packet. This allows each station to know when it needs to send or receive packets.

4 shows the timing and frame interval in detail when sending several frames in the allocation section.

As shown in FIG. 4, in the nth time slot CTA n, the aforementioned SIFS is present between each data frame Frame 1, Frame 2, and Frame 3, and an ACK frame thereof, and the time slot CTA n. ) And the guard time described above between the time slot CTA n + 1.

2. Data transfer

To transfer data, private wireless networks provide two types of connections, synchronous and asynchronous. Asynchronous connections have a small load on connection creation but are not guaranteed for bandwidth and are primarily used to transmit general data that is relatively insensitive to time delays. Synchronous connections, on the other hand, are large in load and bandwidth guaranteed at connection creation, and are used to transmit data close to real-time services such as audio and video.

3. Power Management

Efficient power management is of paramount importance in personal wireless networks that support mobile devices. Since the slaves can know the times to send and receive from the beacon packet, it can prevent unnecessary power consumption by activating the physical layer only when necessary.

For example, if there is no packet to transmit, the slave joining the piconet activates the physical layer only for the beacon period and listens to the beacon packet. When there is a command or data packet directed to the beacon packet and received by the beacon packet, the packet is activated by activating the physical layer in the slot allocated to the competition section or the allocation section. The station to send the command packet activates the physical layer and transmits the packet during the contention period. The station to transmit the data packet transmits the data packet by activating the physical layer in the interval allocated to the station. If there is no packet to transmit / receive, the master activates the physical layer to transmit and receive packets during the beacon and the competition intervals, and the packet transmits and receives the packet by activating the physical layer in the slot allocated to the master. In addition, if necessary, the physical layer is activated in the slot not allocated to itself to check whether the packet is actually being transmitted in the corresponding slot.

FIG. 5 is a timing diagram of transmission and reception in an active state, and in FIG. 5, the master and the slaves Slave 1 to Slave 3 operate in the active mode.

In more detail, the master transmits a packet by activating a physical layer (PHY) in a slot (M-> S1) allocated to itself in a beacon section and an allocation section (TX_ON = 1, RX_ON = 0), the packet is activated by activating the physical layer in the slot (S2-> M) allocated to itself in the contention interval (CAP) and the allocation interval (RX_ON = 1, TX_ON = 0). The slave 1 receives a packet by activating a physical layer in a beacon period, a contention period CAP, and a slot M-> S1 of an allocation period assigned thereto, and receives a packet in the allocation period. The packet is transmitted by activating the physical layer in the slot (S1-> S2) allocated to the slot. The same is true for the slave (Slave 2). On the other hand, since the slave Slave 3 does not have a slot allocated to itself in the allocation section, the slave S3 receives the packet by activating the physical layer only in the beacon section and the contention section CAP.

On the other hand, the sleep mode is used to reduce the power consumption of the slave that has no data to transmit and receive, and according to the 802.15.3 standard, HIBERNATE, PSPS, and SPS modes are defined.

6 is a timing diagram of transmission and reception for explaining switching between an active mode and a sleep mode.

A slave that has no data to send or receive can enter sleep mode by requesting and accepting sleep mode from the master. Then, the sleep mode is requested and responded, and a periodic parameter related to the sleep mode is set. If the slave receives the sleep mode, the slave enters a sleep state, and as shown in FIG. 6, it cannot transmit or receive a packet while in the sleep state. In addition, the mobile station wakes up every period agreed with the master and receives a beacon to determine whether there is a data packet to receive. If there is data to be received, the data is received through the assigned interval, and if not, it is put back to sleep. Stations that are not asleep can use beacons to identify the IDs of stations that are asleep and their wake-up intervals.

On the other hand, if it is necessary to transmit data with the station in the sleep state, the resource allocation request to the master, if the resource allocation request is successful, the master allocates resources through beacons that the station in the sleep state wakes up and listens. The station in sleep state then wakes up in its assigned interval (Active State), and the station to transmit transmits data through that interval. When data is received, this means that the station that was automatically asleep has woken up from sleep.

However, the 802.15.3 standard only defines the operation of each station in the sleep mode / active mode described above, and therefore, a detailed study is required for a hardware design and an operation method for efficiently reducing power consumption in implementing the same. It is becoming.

An object of the present invention is to provide a hardware and a method of operating the same, which can further reduce power consumption in accordance with operating characteristics of each functional block in a sleep mode in implementing the PHY and MAC hardware of the personal wireless network communication device described above. There is this.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a medium access control apparatus for implementing a medium access control layer (MAC) of a personal wireless network (WPAN) that supports active mode and sleep mode, A first block maintaining super frame synchronization with a master of the private wireless network in a sleep mode; A second block configured to perform contention period and allocation period processing of the super frame in an active mode; And a clock selector which provides a normal clock to the first block and the second block in an active mode, and provides a clock lower than the normal clock to the first block and does not provide a clock to the second block.

According to a second aspect of the present invention, a medium access control layer (MAC) and a physical layer (PHY) of a personal wireless network (WPAN) supporting an active mode and a sleep mode are implemented. A media access control and a physical layer apparatus are provided, a physical layer block performing physical layer processing, a media access control block connected to the physical layer block to perform a media access control layer processing, and the media access control and physical layer A register block for storing register information of the device, and a direct memory access (DMA) block for relaying data exchange between the upper layer and the medium access control block. The medium access control block may include: a first block for maintaining super frame synchronization with a master of the private wireless network in a sleep mode; a second block for performing contention period and allocation interval processing of the super frame in an active mode; And a clock selector which provides a normal clock to the first block and the second block in an active mode, and provides a clock lower than the normal clock to the first block and does not provide a clock to the second block.

At this time, preferably, the direct memory access block may further include a direct memory access interface block for interfacing data exchange between the media access control block.

The register block may store register information regarding the active mode and the sleep mode, and the clock selector may receive register information about the active mode and the sleep mode stored in the register block.

According to a third aspect of the present invention, there is provided a physical layer device for implementing a physical layer (PHY) in a personal wireless network (WPAN) device that communicates using a super frame, wherein The remaining time is compared with the time required for data transmission. If the remaining time is less than the time required for data transmission, the physical layer is deactivated.

In this case, the time required for data transmission may include a time required for receiving an immediate acknowledgment frame corresponding to the data transmission.

According to a fourth aspect of the present invention, there is provided a physical layer device that implements a physical layer (PHY) in a personal wireless network (WPAN) device that communicates using a super frame, wherein The remaining time is compared with the time required for receiving the minimum size frame, and if the remaining time is less than the time required for receiving the minimum size frame, the physical layer is deactivated.

According to a fifth aspect of the present invention, there is provided a method of operating a physical layer (PHY) for reducing power consumption in a personal wireless network (WPAN) device that communicates using a super frame, and transmits to the device in the super frame. Comparing the remaining time of the interval and the time required for data transmission, and if the remaining time is less than the time required for the data transmission, the step of deactivating the physical layer.

Finally, according to a sixth aspect of the present invention, there is provided a method of operating a physical layer (PHY) for reducing power consumption in a personal wireless network (WPAN) device that communicates using a super frame. And comparing the time required for receiving the frame with the minimum size with the remaining time of the reception-allocated section, and if the remaining time is less than the time required for receiving the frame with the minimum size, deactivating the physical layer.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, and like reference numerals refer to like or similar components throughout the drawings.

FIG. 7 illustrates block-by-block configurations of the PHY and MAC hardware 200 of the personal wireless network communication device. The register block (wpan_reg) 210, the DMA block 220, the MAC upper block (mac_top) 230, It is composed of a PHY block (phy_top) 240, a DMA interface block (dma_if) 250, and is connected to the AHB bus (AHB BUS) (Advanced High-performance bus) 100 and the radio (RF) 300 have.

The register block (wpan_reg) 210 manages registers for controlling MAC and PHY hardware blocks, and may exchange register data through the AHB bus 100. The DMA block 220 is a block for exchanging data between the embedded CPU (not shown) (not shown) and the MAC hardware through the AHB bus 100 described above, and the interference of the embedded CPU. It operates at zero speed and provides high bandwidth.

The MAC upper block (mac_top) 230 is connected to the register block (wpan_reg) 210 and the DMA interface block (dma_if) 250, and the MAC layer processing for the transmit / receive data of the DMA interface block (dma_if) 250 and Perform other MAC protocol processing.

The PHY block (phy_top) 240 is a block for processing the physical layer (PHY), and is connected to the register block (wpan_reg) 210 and the MAC upper block (mac_top) 230 for this purpose. That is, the PHY block (phy_top) 240 exchanges the transmit / receive data (TX, RX DATA) with the DMA interface block (dma_if) 250, and processes the physical layer (PHY) and transmits it to the radio unit (RF) 300. Alternatively, the physical layer (PHY) process may be performed on the signal received from the radio unit (RF) 300 and transferred to the DMA interface block (dma_if) 250.

The DMA interface block (dma_if) 250 exchanges data between the DMA block 220 and the PHY block (phy_top) 140 under the control of the MAC upper block (mac_top) 230, and the MAC upper block (mac_top) ( The MAC frame is generated under the control of 230). For example, the DMA interface block (dma_if) 250 generates an acknowledgment (ACK) frame. The MAC upper block (mac_top) 230 and the DMA interface block (dma_if) 250 may configure one MAC hardware.

The radio unit (RF) 300 receives a signal from the PHY block (phy_top) 140 and transmits it through an antenna (not shown), or conversely, a signal received from the antenna (not shown) is transmitted from the PHY block (phy_top). To 140). The radio 300 may be included as part of the PHY and MAC hardware 200, or may be implemented separately.

8 shows a detailed configuration of the MAC hardware 400, the FSM block 410, TC block 420, RXB block 430, TXB block 440, CSMAB block 450, TMB block 460 ), The MSB block 470 and the IC block 480. Meanwhile, the MAC hardware 400 of FIG. 8 corresponds to the MAC upper block (mac_top) 230 and the DMA interface block 250 of FIG. 7.

Finite State Machine (FSM) block 410 is coupled to other blocks within MAC hardware 400 as shown to manage the overall state transition of the MAC hardware. The TC block 420 processes the superframe structure using various types of timers and counters required by the MAC hardware.

The RXB block 430 processes peripheral scan, synchronization, data reception, received data filtering, and immediate acknowledgment frame transmission. TXB block 440 processes data transmission and immediate acknowledgment frame reception. For example, the RXB block 430 processes a received frame transmitted from the PHY block 240, generates an immediate acknowledgment frame corresponding to the received frame, and delivers the received frame to the PHY hardware 240. TXB block 440 generates a transmission frame from the data delivered from DMA block 220 to the PHY hardware 240, and processes the immediate acknowledgment frame received from the PHY block 240.

The CSMAB block 450 processes CSMA / CA, which is a competition section protocol defined in a private wireless network. The TMB block 460 handles test modes such as loopback. The MSB block 470 handles the functions required when operating as a master. IC block 480 handles all interrupts occurring in the MAC hardware.

FIG. 9 illustrates a clock connection of the MAC hardware 400 for reducing power consumption in the sleep mode according to the first embodiment of the present invention. As the clock is lowered, power consumption is reduced.

As illustrated in FIG. 8, the functions of the respective blocks of the MAC hardware 400 are processed using the FSM block 410 that manages the overall state transition of the MAC hardware, a timer and a counter, and the superframe structure is used to perform super frame synchronization. The TC block 420 to maintain and the IC block 480 to handle interrupts generated by MAC hardware are required to maintain super frame synchronization with the master even in the sleep mode. Therefore, these blocks can reduce the power consumption of the MAC hardware by operating at the minimum clock that can be operated.

In contrast, the RXB block 430, the TXB block 440, the CSMAB block 450, the TMB block 460, and the MSB block 470 perform the contention period and the allocation period processing of the super frame in the active mode. Therefore, since the function is not required in the sleep mode, the sleep mode of the MAC hardware can be normally performed even if a clock is not provided in the sleep mode.

9, the clock selector 490 includes two multiplexers 490a and 490b, and each function of the MAC hardware 400 according to an operation mode of the personal area communication device, that is, an active mode or a sleep mode. The clock provided to the block is varied.

More specifically, the multiplexers (MUXs) 490a and 490b provide a normal clock to the MAC hardware 400 in active mode. In sleep_mode, the multiplexer (MUX) 490a selects a clock with a lower frequency than the normal clock (e.g., 1 kHz as shown) to select the FSM block 410, TC block ( 420, and IC block 480. In this case, the frequency applied to these blocks in the sleep mode may be selected between the minimum operating clock and the normal clock of these blocks, and preferably, the minimum clock at which these blocks can operate normally may be selected. .

On the other hand, the multiplexer (MUX) 490b selects '0' in the sleep mode, thereby RXB block 430, TXB block 440, CSMAB block 450, TMB block 460, and MSB block 470. Do not apply clock to). The signal sleep_mode for controlling the multiplexer (MUX) 490a and 490b may be provided from the register block wpan_reg 210.

Next, a second embodiment in which power consumption of the PHY hardware can be reduced in the active mode will be described with reference to FIG. 10. In FIG. 10, the device 2 is allocated a time slot for transmitting data to the device 1.

In relation to the physical layer (PHY) operation of the receiving device, according to the prior art, the receiving device 1 transmits and activates the physical layer while transmitting an immediate acknowledgment frame (RX_ON = 0, TX_ON = 1), and the rest During the time slot, the physical layer (PHY) is maintained in the receive activation state to receive data from the device 1 (RX_ON = 1, TX_ON = 0). By the way, when the remaining allocation section is less than the time required to receive the smallest frame (12 bytes) at the time t1, although the reception cannot be completed, the device 1 on the receiving side until the allocated time slot ends. There is a problem of maintaining this reception activation state.

However, according to the second embodiment of the present invention, at a time point in which the remaining allocation interval is less than the time required to send the smallest frame (12 bytes) (eg, t1), the RX_ON = 0, TX_ON = 0). At this time, the time required to send a frame is the sum of the time required to send a preamble, a header, and a payload.

Subsequently, in connection with the operation of the physical layer (PHY) of the transmitting device, the device 2 (the transmitting side) determines whether data can be transmitted during the remaining allocation period at the time of transmitting the data (eg, t2 in FIG. 10). . At this time, the time required for data transmission may include the reception time of the time instant acknowledgment frame. If the remaining allocation interval is less than the time required for data transmission, the transmission cannot be completed (PHY) is not activated ("TX_ON" is kept at 0).

As described above, according to the second embodiment of the present invention, when the device does not use the time slot allocated in the active mode (including when it is not available), power consumption can be reduced by deactivating the physical layer, and the transmission device And power consumption can be reduced in both the receiving device.

Although the preferred embodiment according to the present invention has been described above, this is merely exemplary and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the protection scope of the present invention should be defined by the following claims.

As described above, according to the present invention, PHY and MAC hardware of a personal wireless network communication device capable of reducing power consumption may be implemented. In particular, according to the first embodiment of the present invention, the power consumption may be further reduced by reflecting the operation characteristics of the functional blocks of the MAC hardware in the sleep mode, and according to the second embodiment of the present invention, the power of the PHY hardware in the active mode. There is an advantage that can reduce the consumption.

Claims (16)

A medium access control apparatus for implementing a medium access control layer (MAC) of a personal wireless network (WPAN) supporting active mode and sleep mode, A first block maintaining super frame synchronization with a master of the private wireless network in a sleep mode; A second block performing processing of a contention period and an allocation period of the super frame in an active mode; A clock selector which provides a normal clock to the first block and the second block in an active mode, and provides a clock lower than the normal clock to the first block and does not provide a clock to the second block in the sleep mode. Device for controlling a medium access of a private wireless network comprising a. The method of claim 1, wherein the clock selector A first multiplexer (MUX) for providing a clock to the first block by selecting a normal clock in an active mode and a clock lower than the normal clock in a sleep mode; A second multiplexer (MUX) that selects a normal clock in active mode to provide a clock to the second block and does not provide a clock in sleep mode Device for controlling a medium access of a private wireless network comprising a. The method of claim 1 or 2, wherein the first block A state transition unit for managing a state transition of the medium access control device; A timer / counter unit for processing the superframe structure transmitted and received in the private wireless network using a timer and a counter to maintain the superframe synchronization; An interrupt unit for processing interrupts generated by the medium access control apparatus; Apparatus for media access control of a private wireless network comprising a. The method of claim 1 or 2, wherein the second block A receiving unit which processes a receiving frame and transmits an immediate acknowledgment frame; A transmitter which processes the received instant acknowledgment frame and generates a transmission frame; A competition section processing unit which performs a competition section processing of the personal wireless network; A test unit for processing a test mode of the medium access control device; Master function unit for performing a master operation of the private wireless network Apparatus for media access control of a private wireless network comprising a. A medium access control layer (MAC) and a physical layer (PHY) of a personal wireless network (WPAN) supporting active mode and sleep mode, and are a medium access control and physical layer device for use in combination with a higher layer device. A physical layer block performing physical layer processing, A medium access control block connected to the physical layer block to perform a medium access control layer process; A register block for storing register information of the medium access control and physical layer device; A direct memory access (DMA) block for relaying data exchange between the upper layer and the medium access control block; The medium access control block A first block maintaining super frame synchronization with a master of the private wireless network in a sleep mode; A second block performing processing of a contention period and an allocation period of the super frame in an active mode; A clock selector which provides a normal clock to the first block and the second block in an active mode, and provides a clock lower than the normal clock to the first block and does not provide a clock to the second block in the sleep mode. Media access control and physical layer device of a private wireless network comprising a. The method of claim 5, A direct memory access interface block for directly interfacing data exchange between the direct memory access block and the medium access control block Media access control and physical layer device of a private wireless network further comprising. 7. The apparatus of claim 5 or 6, wherein the register block stores register information relating to the active mode and the sleep mode. The method of claim 7, wherein the clock selector is provided with register information about the active mode and sleep mode stored in the register block, A first multiplexer (MUX) for providing a clock to the first block by selecting a normal clock in an active mode and a clock lower than the normal clock in a sleep mode; A second multiplexer (MUX) that selects a normal clock in active mode to provide a clock to the second block and does not provide a clock in sleep mode Media access control and physical layer device of a private wireless network comprising a. The method of claim 7, wherein the first block is A state transition unit for managing a state transition of the medium access control device; A timer / counter unit for processing the superframe structure transmitted and received in the private wireless network using a timer and a counter to maintain the superframe synchronization; An interrupt unit for processing interrupts generated by the medium access control apparatus; Media access control and physical layer device of a private wireless network comprising a. The method of claim 7, wherein the second block is A receiving unit which processes a receiving frame and transmits an immediate acknowledgment frame; A transmitter which processes the received instant acknowledgment frame and generates a transmission frame; A competition section processing unit which performs a competition section processing of the personal wireless network; A test unit for processing a test mode of the medium access control device; Master function unit for performing a master operation of the private wireless network Media access control and physical layer device of a private wireless network comprising a. A physical layer device that implements a physical layer (PHY) in a personal wireless network (WPAN) device that communicates using superframes, In the super frame, a time required for data transmission is compared with a remaining time of a section allocated to transmission to the device. Physical layer apparatus of the personal wireless network device, if the remaining time is less than the time required for data transmission. The method of claim 11, And the time required for the data transmission includes the time required for receiving an immediate acknowledgment frame corresponding to the data transmission. The method according to claim 11 or 12, wherein In the super frame, the remaining time of the section allocated to the reception and reception of the device is compared with the time required to receive the minimum size frame. And if the remaining time is less than the time required to receive the frame of minimum size, physical layer apparatus of the personal wireless network device. A physical layer device that implements a physical layer (PHY) in a personal wireless network (WPAN) device that communicates using superframes, In the super frame, the remaining time of the section allocated to the reception and reception of the device is compared with the time required to receive the minimum size frame. And if the remaining time is less than the time required to receive the frame of the minimum size, the physical layer apparatus of the personal wireless network device. A method of operating a physical layer (PHY) to reduce power consumption in a personal wireless network (WPAN) device communicating using super frame, Comparing the time required for data transmission with the remaining time of the interval allocated to the device in the super frame; If the remaining time is less than the time required for the data transmission, deactivating the physical layer Physical layer operation method of a personal wireless network device comprising a. A method of operating a physical layer (PHY) to reduce power consumption in a personal wireless network (WPAN) device communicating using super frame, Comparing the time required to receive the minimum size frame with the remaining time of the interval allocated to the device in the super frame; If the remaining time is less than the time required for receiving the minimum size of the frame, deactivating the physical layer Physical layer operation method of a personal wireless network device comprising a.

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