WO2011096752A2 - 소스 장치, 데스티네이션 장치 및 릴레이 장치의 통신 방법 - Google Patents
소스 장치, 데스티네이션 장치 및 릴레이 장치의 통신 방법 Download PDFInfo
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- WO2011096752A2 WO2011096752A2 PCT/KR2011/000757 KR2011000757W WO2011096752A2 WO 2011096752 A2 WO2011096752 A2 WO 2011096752A2 KR 2011000757 W KR2011000757 W KR 2011000757W WO 2011096752 A2 WO2011096752 A2 WO 2011096752A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15557—Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/1555—Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the following embodiments relate to a communication method of a source device, a destination device and a relay device in a wireless system.
- Millimeter waves such as the recently standardized 60 GHz band, use a broadband of about 2 GHz, allowing handwriting to easily transmit non-PS data without high modulation.
- the power loss has a big disadvantage. Therefore, in order to compensate for this, a method of obtaining high antenna gain by collecting power in a specific direction rather than omnidirectionally using a directional antenna is used.
- the signal must be reflected and transmitted. In such a case, the distance is increased and the attenuation loss is increased, thereby adding to the loss due to reflection.
- the penetration loss is more than 20dB, and the doors or walls that normally exist in the room are more lossy and the signal cannot be reached.
- communication in the 60 GHz band limits the reach to less than 10 m, because the far distance is attenuated according to the distance even if there is no reflection or penetration loss, so the signal may not reach.
- a wireless LAN that is more than 10m wide and used in the band below 5GHz has a range of several tens of meters, so one network can cover all of these distances.
- communication in the 60 GHz band is not so that users may feel uncomfortable.
- communication methods for example, a wireless local area network (WLAN) or a wireless personal area network (WPAN) considering directional communication suitable for such a band are considered.
- WLAN wireless local area network
- WPAN wireless personal area network
- LOS line of sight
- the receiver in order to receive the signal sent by the transmitter on the bypass link without receiving the signal, the receiver must orient the reception direction of the signal before the transmitter, and a relay method that can be used in the reserved section regardless of the transmission method used in the bypass link need.
- One embodiment of the present invention provides a link switching method for bypassing a relay device and a data transmission method after link switching even when signal transmission to a terminal to be communicated is not performed when MAC access is performed using a directional antenna. It provides a communication method of a source device, a destination device and a relay device that can use a reserved section regardless of one integrated method.
- a communication method of a source device detects a state of a first link directly connected from a source device to a destination device or a second link connected from the source device to the destination device via a relay device. Doing; Selecting one of the first link and the second link based on the detection result; And transmitting data using the selected link.
- the communication method of the destination device is the source of the first link directly connected from the source device to the destination device or the second link connected from the source device to the destination device via a relay device Determining whether a link selected by the device is available; And receiving data based on the determination result.
- a first link is directly connected to a destination device from a source device to a destination device and a second link is connected to the destination device from a source device via a relay device. Waiting to receive data from the source device at a start point of a preset link change interval when the second link is selected as the selected link; And transmitting the data to the destination device.
- the bypass link via the relay device is switched to facilitate data transmission, and the relay device is a full duplex
- data may be transmitted in a unified manner regardless of whether it is a half duplex scheme or the like.
- FIG. 1 is a flowchart illustrating a communication method of a source apparatus according to an embodiment of the present invention.
- FIG. 2 is a flowchart illustrating a communication method of a destination apparatus according to an embodiment of the present invention.
- FIG. 3 is a flowchart illustrating a communication method of a relay device according to an embodiment of the present invention.
- FIG. 4 is a diagram illustrating a frame transmission rule added when data is transmitted using an AF relay device using a full duplex (FD) relay method according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating a frame structure of an 802.11 WLAN used in an embodiment of the present invention.
- FIG. 6 is a diagram illustrating a frame transmission rule added when data is transmitted using a decode and forward (DF) relay device using a half duplex (HD) relay method according to an embodiment of the present invention.
- DF decode and forward
- HD half duplex
- the source device, the destination device, and the relay device have a directional antenna and perform communication operations, a base station, and similar operations, which can act as sources, destinations, and relays, respectively, in a communication network. Includes all devices It is assumed that each of the source device, destination device, and relay device uses reservation-based media access control.
- the data described below is a concept including a data frame or a data packet.
- WLAN and WPAN provide methods for transmitting data in a competitive and non-competitive manner.
- An access point (AP) in a WLAN or a pico net coordinator (PNC) in a WPAN divides a time zone into a competition section and a non-competition section.
- AP access point
- PNC pico net coordinator
- CSMA / CA carrier sense multiple access with collision avoidance
- the AP or PNC allows a specific device to exclusively use a specific time domain of the non-competition period for data transmission by a polling technique or a method of transmitting scheduling information.
- a link for transmitting data that is, a link switching method and a relay method of a relay device when the switching link passes through a relay device
- the method of relaying and transmitting data suitably is described.
- a method for relaying and transmitting data appropriately according to a link switching method and a relay method described below is based on IEEE 802.11 WLAN.
- the relay use mode may be determined.
- the first field of the relay use mode indicates a normal / alternation mode, and the second field indicates a full duplex (FD) relay method.
- the half duplex (HD) relay decode and forward (DF) relay device does not operate in the exchange mode, but only in the normal mode.
- Normal mode is a method in which a source device and a destination device continuously exchange frames only with one of a direct link or a relay link, unless blockage or channel deterioration on the corresponding link becomes unusable. .
- a link change interval refers to a method of exchanging frames by alternately switching two links at predetermined intervals.
- the source device decides whether to transmit data in the normal mode or the exchange mode, and sends the data to the relay device and the destination device. The value does not change unless the source device changes the mode.
- FIG. 1 is a flowchart illustrating a communication method of a source apparatus according to an embodiment of the present invention.
- FIG. 1 illustrates a method of switching a link transmitting data by a source device when a link in data transmission in a non-competition period is blocked.
- the source device sets parameters to the destination device and the relay device including a data sensing time for detecting whether a link change interval or a destination device has transmitted data over the selected link. I can tell you.
- the source device may transmit information about an operation mode and a relay method of the relay device used to transmit data to the destination device and the relay device (101).
- the selected link may be either a first link directly connected to the destination device from the source device or a second link connected to the destination device from the source device via the relay device.
- the relay method of the relay device may include at least one of a full duplex (FD) method and a half duplex (HD) method.
- the relay device switches the first link to the second link at a Link Change Interval preset by the source device, and after the data sensing time, the second device switches the second link. Data can be sent over the link.
- FD full duplex
- the data sensing time is the time required for the destination device to detect whether data has been sent over the selected link (here, the first link).
- the relay device replaces the preset link change interval used in the full duplex method, and a first period for the relay link between the source device and the relay device and the relay device and the destination. Data may be transmitted according to a second period for a relay link between the nation devices.
- the first period and the second period may be set or updated by the source device like the data sensing time.
- the source apparatus uses a first period based on at least one of a beamforming result obtained before transmitting data to the destination apparatus and quality information of the corresponding link acquired during data transmission on the link.
- the second period may be set or updated.
- the first period for the relay link between the source device and the relay device may begin when the source device has switched the first link to the second link.
- the preset link change interval may be restarted when the source device switches the link from the second link to the first link.
- the operation mode used by the source device to transmit data to the destination device and the relay device may include at least one of a normal mode and an exchange mode.
- the normal mode is a mode in which data is transmitted to the destination apparatus using either link until it is determined that either link of the first link or the second link is unavailable.
- the exchange mode is a mode in which the source device alternately uses the first link and the second link at the start of a preset link change interval and transmits data to the destination device. .
- the second link may be formed between the source device and the relay device (S-R) and between the relay device and the destination device (R-D).
- the source device detects 103 a state of a first link directly connected from the source device to the destination device or a second link connected from the source device to the destination device via a relay device.
- the source apparatus selects one of the first link and the second link based on the detection result (105).
- the source device may switch any one of the first link and the second link to the selected link at a link change interval based on the detection result.
- the source device may adjust the direction of the directional antenna of the source device according to the result of beamforming previously acquired through the unselected link to increase the transmission antenna gain of the data through the unselected link.
- the source device determines which of the first and second links is based on the link quality information obtained from the frame for estimating the state of the channel or the ACK signal for previous data transmitted to the destination device over the selected link. You can select one link.
- the link change belongs to the moment when it is determined that it is not available.
- the selected link in the next link change interval of the interval may be switched to an unselected link.
- an unavailable link is not limited to a blocked link. If an unblocked link has a status of lower quality than that of an available link, a 'unavailable link' is used. Can be expressed as'
- the source device transmits the data using the selected link (107).
- the source device is either the data sensing time for the destination device to detect whether data has been sent over the selected link, or the switching time required for the destination device to switch from the selected link to an unselected link. After taking into account the switching time, data can be transmitted using the selected link.
- the source device decides to resume transmission of data according to the above-described exchange mode, the source device sends data of the next link change interval of the link change interval to inform the destination device that the operation on the selected link has resumed. After the sensing time, data may be transmitted to the destination device.
- the source device may periodically switch to the non-selected link to monitor the quality of the non-selected link of the first link or the second link.
- the source device may transmit a request frame for monitoring the quality of the first link to the relay device.
- the source device may receive a response frame including information indicating the quality of the first link in response to the request frame from the relay device.
- the relay device when the source device switches from the second link to the first link to monitor the quality of the unselected link, the relay device requests a relay device to monitor the quality of the link between the source device and the relay device in the second link. Can be transmitted.
- the source device then responds to the request frame with information about the quality of the link between the source device and the relay device in the second link and the quality of the link between the relay device and the destination device that the relay device received from the destination device.
- a response frame may be received that includes information about.
- the destination device may transmit / receive a request frame for monitoring the quality of the second link and a response frame corresponding to the request frame.
- the source device may determine whether the first link being used to transmit data to the destination device is blocked.
- the source device may determine whether the first link currently being used is blocked according to a preset rule used to transmit data to the destination device.
- the preset rule is a time instance for transmitting data to the destination device or an ACK transmitted to the source device by the other device receiving the data transmitted by the source device. Whether or not it is done.
- the source device may switch the currently used first link to the second link according to a preset link change interval. If it is determined that the first link is blocked, the source device may switch the first link to the second link at a next link change interval of a preset link change interval (here, the link change interval to which the blocked moment belongs).
- the source device then transmits the data using the second link.
- the source device may transmit data using the second link after a time considering the data sensing time and the switching time.
- the switching time is the time it takes for the destination device to switch the link from the first link to the second link.
- the source device may continue to use the first link without transmitting the link and transmit data to the destination device.
- the source device may transmit a request frame for determining whether the data received by the relay device has been successfully delivered to the destination device to the relay device connected to the second link.
- the request frame may be a relay ACK request frame as shown in Table 1 below.
- the source device transmits data according to the first period and the second period instead of the link change interval.
- the relay device since the ACK in the second period is transmitted by the relay device to the destination device, the relay device may know the status of the link RD, but the source device may determine the status of the link RD. The state is unknown.
- the source device may send a relay request frame to the relay device in the next first period as shown in Table 1 below to request information on whether the frame is well transmitted on the R-D link.
- the relay acknowledgment frame is a frame sent to the relay device in which the source device participates in a relay operation to know whether all frames delivered to the relay device have been successfully delivered to the destination device.
- the source device may receive a response frame indicating whether data has been delivered to the destination device from the relay device.
- the response frame may be a relay acknowledgment frame.
- the relay device responds to the relay request frame as shown in Table 2 below with respect to the relay request frame.
- the relay acknowledgment frame is a frame sent by the relay device to report to the source device participating in the relay operation which frame was successfully delivered to the destination device.
- FIG. 2 is a flowchart illustrating a communication method of a destination apparatus according to an embodiment of the present invention.
- FIG. 2 illustrates the operation of the destination apparatus as the source apparatus switches the link transmitting the data when the data transmission link in the non-competition period is blocked.
- the destination apparatus may receive information on the relay mode of the relay device and the operation mode used to transmit data from the source device in the initialization process. In addition, the destination apparatus may receive a preset link change interval from the source apparatus (201).
- the relay method of the relay device may include at least one of a full duplex (FD) method and a half duplex (HD) method.
- FD full duplex
- HD half duplex
- the first period and the second period used in the relay method and the half duplex (HD) method of the relay device are no longer available when the first link is the selected link.
- the link change interval may begin at the beginning of a first period in which the source device switches the link from the second link to the first link.
- FD full duplex
- HD half duplex
- the description of the operation mode including at least one of the normal mode and the exchange mode also refers to the description of the corresponding part of FIG.
- the destination apparatus determines whether a link selected by the source apparatus is available from the first link directly connected to the destination apparatus from the source apparatus or the second link connected via the relay apparatus from the source apparatus to the destination apparatus (203). ).
- the destination apparatus may determine whether the selected link is available according to whether data has been received through the selected link for a predetermined time.
- the predetermined time may be a time from the start of a preset link change interval to the elapse of the data sensing time.
- the destination device may switch the link of the destination device from the second link to the first link at the beginning of every first period to determine whether the source device switches from the second link to the first link.
- the destination apparatus When the destination apparatus switches from the second link to the first link and receives data available from the source device through the first link, the destination apparatus changes the link change interval from the start of the first period of receiving the data on the first link. Can be regarded as beginning.
- the link of the destination device is disconnected from the first link at the start of the next second period of the next first period and the next second period. Can switch to the second link.
- the source device may transmit data to the relay device, and in the next second period, the relay device may transmit data to the destination device.
- the destination apparatus receives the data based on the determination result (205).
- the destination device checks whether the source device has switched to the selected link. Then, when it is confirmed that the source device has switched to the selected link, the destination device may point the directional antenna of the destination device in the direction toward the selected link to wait for reception of data.
- the destination device If the destination device is in normal mode and the destination device does not receive data available from the source device within the data sensing time from the start of the preset link change interval, it will switch the selected link to an unselected link. Can be.
- the operation of the destination apparatus when the operation mode is the switched mode and data is received through the selected link is as follows.
- the destination device may receive data through a link selected at the start of a preset link change interval.
- the destination apparatus may switch to a link that is not selected in the next link change interval of the preset link change interval.
- the destination device may then receive data from the start of the next link change interval.
- the operation of the destination device according to the relay method and the operation mode of the relay device is as follows.
- the destination device is a link via a relay device (here, the second link) if the selected link is the second link and the value of the More Data field of the previous data frame is '0' when the relay device is a half duplex method. May not switch the link to the first link even if data is not received during the second period.
- a relay device here, the second link
- the destination device does not receive data during the data sensing time on the selected link. If not, the selected link can be maintained.
- the destination device exchanges a link at the next link change interval of the preset link change interval. You can keep the selected link as it is.
- the operation of the destination apparatus will be described on the assumption that the destination apparatus is receiving data using the first link, according to an exemplary embodiment.
- the destination device may determine whether the first link used to receive data from the source device is blocked. In this case, the destination device may check whether the source device has switched the first link.
- the destination device may be directed to receive the data by directing the directional antenna of the destination device toward the second link.
- the destination device switches the first link to the second link after the data sensing time has elapsed according to the link change interval preset by the source device, and uses the second link to switch the data. Can be received.
- the destination device may continue to receive data from the source device using the first link.
- the destination device may switch the link from the direct link to the relay link when data is not received at a proper time in the normal mode. That is, when the operation mode is the normal mode and the destination device does not receive data available from the source device within the data sensing time from the start of the preset link change interval, the destination device may switch the direct link to the relay link. Can be.
- the destination device may remain on the current link instead of alternating the links.
- the operation mode is the switched mode and the destination device receives the data of the second link at the next link change interval of the link change interval preset through the first link, instead of switching to the second link according to the switched mode. May maintain the current first link.
- FIG. 3 is a flowchart illustrating a communication method of a relay device according to an embodiment of the present invention.
- FIG 3 illustrates an operation of a relay device as the source device switches a link for transmitting data when a link in data transmission in a non-competition period is blocked.
- the relay device waits for receiving data from the source device at the start of the preset link change interval (301).
- the first link is a link directly connected from the source device to the destination device
- the second link is a link connected from the source device to the destination device via a relay device.
- the relay device may adjust the direction of the directional antenna of the relay device for a predetermined time from a start point of the preset link change interval to wait for data reception from the source device on the second link.
- the relay device receives the data from the source device (303) and then transmits the data to the destination device (305).
- the relay device may receive information on the first period and the second period from the source device. Thereafter, the relay device may receive data from the source device in the first period and transmit data to the destination device in the second period.
- the first period is for the relay link between the source device and the relay device
- the second period is for the relay link between the relay device and the destination device.
- the relay device may receive a request frame from the source device to determine whether data transmitted from the source device to the relay device has been delivered to the destination device.
- the relay device may transmit a response frame indicating whether data has been delivered to the destination device in response to the request frame.
- the relay device may operate according to at least one relay method of a full duplex method and a half duplex method.
- the full duplex scheme switches a first link to a second link at a preset link change interval, and senses data for the destination device to detect whether data is transmitted through the first link.
- the data is transmitted on the second link after a data sensing time.
- the half duplex method transmits data in the same manner as the full duplex method when the transmitting device uses the first link, and according to the first period and the second period when the transmitting device uses the second link. It is a way to transmit.
- the relay device receives the data through the link toward the destination device by adjusting the direction of another directional antenna of the relay device for a predetermined time from the start of a preset link change interval. Can wait.
- the relay device transmits / receives an operation of the directional antenna of the relay device according to the policy of the frame type and the ACK signal for each frame received by the relay device. You can switch.
- the operation of the relay device will be described on the assumption that the relay device transmits and receives data using the second link.
- the relay device receives information about the first period and the second period from the source device.
- the relay device receives data from the source device in the first period and transmits the data to the destination device in the second period.
- the relay device may receive a request frame for determining whether data transmitted from the source device to the relay device has been delivered to the destination device.
- the relay device may transmit a response frame indicating whether data has been delivered to the destination device.
- the request frame may be a relay request frame
- the response frame may be a relay acknowledge frame.
- Table 1 and Table 2 of FIG. 1 For each frame, the description of Table 1 and Table 2 of FIG. 1 will be referred to.
- a time instant for determining that the corresponding link is blocked may vary depending on the source device and the destination device.
- the different time instance for each device means that the timing of the beamforming process, where each device is directed to the new link for link switching, may vary.
- one embodiment of the present invention uses two parameters, a link change interval and a data sensing time.
- the predetermined period may be a link change interval
- the source device may share information on the predetermined period by informing the relay device and the destination device of the link change interval before transmitting data.
- the source device can switch data at the next link change interval to transmit data. have.
- a preset rule e.g., no ACK is received
- the destination apparatus may not know the link switching made by the source apparatus. This is because the destination device may properly receive the data, but the ACK sent in response to the data may be lost while being transmitted to the source device, and thus the source device may not recognize the ACK for the data transmission.
- the source device may transmit data after a predetermined time (eg, data sensing time) does not immediately transmit data in the next link change interval.
- a predetermined time eg, data sensing time
- the destination device does not know whether link switching has occurred in the next link change interval, so it is still waiting on the link before switching. However, if the data is still not transmitted after a certain time, the destination device switches the link.
- the destination device switches the link after a predetermined time defined as the data sensing time, and the source device switches the data sensing time and the switching time. After the considered time, the data is transmitted using the switched link. This is because the source device is safe to transmit after a time considering the switching time required for the link switching after the data sensing time.
- the switching time can be ignored if it is less than the propagation delay sent from the source device to the destination device. have. Therefore, it can be seen that the destination device switches the link after the data sensing time, and the source device also sends data on the switched link after the data sensing time. Thus, since the destination device is preparing first on the switched link, it can properly receive data transmitted from the source device.
- the relay method of the relay device is a full duplex (FD) method, the source device and the destination device are not changed in operation.
- FD full duplex
- the relay device is a DF relay using a half duplex (HD) relay method
- the relay device needs to decode the data, re-encode it, and deliver it to the destination device. It requires a double slot.
- HD half duplex
- the values of the two fields may be set or updated through the result of the beamforming acquired before the source apparatus transmits the data or the quality information of the link obtained by making a request in the middle of the data transmission interval.
- the source device defines an information element (IE) in which a set of related parameters is collected.
- the source device may send the relevant parameter based on the IE to the destination device via the relay device, and in response, the destination device may again transmit the corresponding information (relevant parameter) to the source device via the relay device.
- IE information element
- the source device transmits a data packet to the relay device within the first period, and sizes the packet so that the source device can receive an ACK after a short inter-frame space (SIFS). If the source device transmits only one MAC layer service data unit (MSDU), it is appropriate to set the value of MSDU + SIFS + ACK + SIFS to be equal to the value of the first period.
- MSDU MAC layer service data unit
- the relay device may similarly receive and encode the size of a packet sent to the destination device within a second period, and may determine the ACK to be received after SIFS. If the relay device also transmits only one MSDU, it is appropriate to set the value of MSDU + SIFS + ACK + SIFS equal to the value of the second period.
- the relay device since the ACK in the second period is transmitted by the relay device to the destination device, the relay device may know the status of the link RD, but the source device may identify the link.
- the state of (RD) is unknown.
- the source device may send a relay request frame as shown in [Table 1] to the relay device in the next first period to request information on whether the frame is well transmitted on the R-D link.
- the relay device may transmit the relay acknowledge frame shown in Table 2 to the source device in response to the relay request frame.
- the format of the two frames (Relay ACK Request and Relay ACK Response) is the same as requesting a BlockAck, as shown in Table 1 and Table 2, sending a BlockAck for this.
- the source device can confirm that the data (frame) has been successfully delivered to the destination device.
- the transmission confirmation for the frame is transferred to the next reserved interval, leaving time for exchanging this data frame in the last first period. Do not go over.
- the link switching operation of the source device may vary depending on which link is used.
- the source device When using a direct link, the source device performs link switching in units of link change intervals as in a full duplex (FD) relay method, but operates through a first period and a second period when using a relay link.
- FD full duplex
- the source device delivers the data frame to the destination device according to the first period and the second period. If the source device does not receive the ACK or relay response frame received in the first period, the source device may consider that the relay link is blocked and switch to the direct link.
- the source device may decide to switch linking and then switch directly to the direct link at the beginning of the first period.
- the link change interval starts when the source device switches the link to the direct link, and can operate using the link.
- the destination device may not know whether the source device has decided to switch the link, but only that the data (frame) to be received has not yet been received. Therefore, the destination device must periodically check whether the source device has performed link switching.
- the destination device Since when the source device transmits a data frame when using a relay link is a first period, the destination device waits for data (frames) from the direction towards the direct link every first period.
- the time waiting for the destination apparatus may be arbitrarily determined by the source apparatus.
- the time for which the destination device waits may be determined, for example, as the data sensing time.
- the destination device may recognize that link switching has occurred and continue to use the direct link. In this case, the link change interval and the data sensing time are used again.
- the destination device aligns the antenna in the direction towards the relay device from the start of the second period and switches to the relay link to wait for data (frame).
- the above-described values of the link change interval, the data sensing time, the first period, and the second period may be determined by the source device similarly to the relay use mode value. Can be.
- the resources (time intervals) allocated to each of the source device and the destination device are started by any one of the link change interval and the first period, and the source device, the relay device, and the destination participating in the relay operation within one link change interval.
- National devices should only use the same link.
- the new link change interval starts immediately after the preceding link change interval, but must not exceed the range of resources allocated to each device.
- the source device In normal mode, the source device must start sending frames to the destination device using the direct link at the beginning of the first resource (time interval) allocated to the source device and destination device. The start of all allocated resources then must use the link that was last successfully used for frame transmission.
- time interval time interval
- the source device in alternating mode, alternates between the direct link and the relay link and sends data to the destination device. At this time, the source device must exchange the link transmitting the frame at the beginning of every link change interval.
- the source device must switch the link for frame transmission at the start of the next link change interval, at which time the relay The device relay must be used to deliver the frame to the destination device.
- the source device stops transmitting the frame at the start of the next link change interval or the first period.
- the link must be switched. At this time, the source device should deliver the frame to the destination device using a direct link.
- FIG. 4 is a diagram illustrating a frame transmission rule added when data is transmitted using an AF relay device using a full duplex (FD) relay method according to an embodiment of the present invention.
- the source device If the source device decides to switch the link at the start of the next link change interval and the normal mode is used as the operation mode, the source device should start transmitting frames after the data sensing time at the start of the next link change interval. do.
- the source device must alternate the link used for frame transmission at the beginning of every link change interval, and the data sensing time is ignored.
- the destination device In normal mode, if the destination device does not receive a frame available from the source device within the data sensing time at the start of the link change interval, the destination device switches the link immediately to attempt to receive a frame from the source device through the relay device. shall.
- FIG. 5 is a diagram illustrating a frame structure of an 802.11 WLAN used in an embodiment of the present invention.
- the destination device does not switch the link in the next link change interval.
- the source device uses either the direct link or the relay link and wants to send frame exchanges again, the source device senses data at the next link change interval to inform the destination device that it wants to operate using the other link again.
- the frame must be transmitted after time. This is the only example where data sensing time is used in exchange mode.
- FIG. 6 is a diagram illustrating a frame transmission rule added when data is transmitted using a decode and forward (DF) relay device using a half duplex (HD) relay method according to an embodiment of the present invention.
- DF decode and forward
- HD half duplex
- the relay device operates as a DF relay device using a half duplex (HD) relay scheme and is using switched mode
- the frame exchange will be performed during the first period and second as long as the relay device is used (that is, as long as the relay link is used). The process is repeated for two periods of the cycle.
- the source device sends a frame to the relay device and the relay device should respond to the source device in SIFS if necessary.
- the relay device In the second period, the relay device must relay the frame received from the source device to the destination device, which, if necessary, responds to the relay device in SIFS.
- the size of the first period and the second period may use the most recently transmitted value.
- the first and second periods are valid only when the source device and the destination device exchange frames via the relay device (i.e., when using a relay link), and the link change interval is directly connected to the source device and the destination device. Valid only when exchanging frames by link.
- the first period begins at the end of the link change interval.
- the link change interval starts from the end of the second period.
- the source device may transmit a relay ACK request frame as shown in [Table 1] to the relay device to check whether all frames transmitted through the relay device are successfully delivered to the destination device.
- a relay device that receives a Relay ACK Request frame must respond to the source device with a Relay ACK Response frame, and the relay device must respond with a relay acknowledge to indicate which frame was successfully received.
- the BlockAck Bitmap field of the Relay ACK Response frame must be set.
- the source device should start transmitting frames at the start of the next link change interval.
- the link currently in use is a direct link and the destination device has not received a frame available from the source device within the data sensing time at the start of every link change interval. Then, the destination apparatus should switch the link and it can be seen that the first period starts at the start of the link change interval.
- the link change interval starts at the end of the second period, where the source device can initiate the transmission of data (frames) using the direct link.
- the destination device should switch to the direct link every first period and listen for the medium towards the source device. If the destination device has received an available frame from the source device, the destination device should remain on the direct link and assume that the link change interval starts from the beginning of the first period.
- the destination device must switch the link at the beginning of the next second period and attempt to receive the frame via the relay device.
- the destination device shall not switch to the direct link even if no frame is received during the second period. .
- an AF relay device using a full duplex (FD) relay method should follow the following points for relay operation.
- the AF relay device using the full duplex (FD) relay scheme in the allocated resources operates in an amplify-and-forward scheme.
- the amplify-and-forward method receives for every frame detected by a radio frequency (hereinafter referred to as RF) in a reception state within a resource operating as an AF relay device using a full duplex (FD) relay method.
- RF radio frequency
- FD full duplex
- the AF relay device using the full duplex (FD) relay method must initialize the RF module directed to the source device to the reception state and initialize another RF module directed to the destination device to the transmission state.
- FD full duplex
- An AF relay device using a full duplex (FD) relay method for each received frame should switch the state of each RF module from a transmission mode to a reception mode or vice versa according to the type of frame and an ACK policy. .
- FD full duplex
- the source device can periodically monitor the quality of the previous link.
- the source device may use the frame exchange rule described above.
- the source device may acquire information on the channel state by using a link adaptation mechanism that is used previously. However, if the previous link is a relay link, the source device uses an existing link adaptation mechanism but additionally needs the following.
- the relay device When the relay device responds to the channel state with the source device, the relay device adds the state information of the relay-destination link to the existing method of transmitting the state information of the source-relay link.
- the source device can switch to the previous link.
- the above-described methods may be embodied in the form of program instructions that can be executed by various computer means and recorded on a computer-readable medium.
- the computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination.
- Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
- Examples of computer readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks such as floppy disks.
- Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
- the hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.
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Abstract
Description
Claims (39)
- 소스 장치로부터 데스티네이션 장치로 직접 연결되는 제1 링크 또는 상기 소스 장치로부터 상기 데스티네이션 장치로 릴레이 장치를 거쳐서 연결되는 제2 링크의 상태를 검출하는 단계;상기 검출 결과를 기초로 상기 제1 링크 및 상기 제2 링크 중 어느 하나의 링크를 선택하는 단계; 및상기 선택된 링크를 이용하여 데이터를 전송하는 단계를 포함하는 소스 장치의 통신 방법.
- 제1항에 있어서,상기 제1 링크 및 상기 제2 링크 중 어느 하나의 링크를 선택하는 단계는상기 검출 결과를 기초로 미리 설정된 링크 체인지 인터벌(Link Change Interval)에서 상기 제1 링크 및 상기 제2 링크 중 어느 하나의 링크를 상기 선택된 링크로 스위칭 하는 단계를 포함하는 소스 장치의 통신 방법.
- 제1항에 있어서,상기 제1 링크 또는 상기 제2 링크 중 선택되지 않은 링크의 품질을 모니터링하기 위하여 주기적으로 상기 선택되지 않은 링크로 스위칭 하는 단계를 더 포함하는 소스 장치의 통신 방법.
- 제3항에 있어서,상기 제1 링크에서 상기 제2 링크로 스위칭한 경우, 상기 릴레이 장치에게 상기 제1 링크의 품질을 모니터링하기 위한 요청 프레임을 전송하는 단계; 및상기 요청 프레임에 응답하여 상기 제1 링크의 품질에 관한 정보를 포함하는 응답 프레임을 수신하는 단계를 포함하는 소스 장치의 통신 방법.
- 제3항에 있어서,상기 제2 링크에서 상기 제1 링크로 스위칭한 경우, 상기 릴레이 장치에게 상기 제 2 링크 중 상기 소스 장치와 상기 릴레이 장치 사이의 링크의 품질을 모니터링하기 위한 요청 프레임을 전송하는 단계; 및상기 요청 프레임에 응답하여, 상기 제 2 링크 중 상기 소스 장치와 상기 릴레이 장치 사이의 링크의 품질에 관한 정보 및 상기 릴레이 장치가 상기 데스티네이션 장치로부터 수신한 상기 릴레이 장치와 상기 데스티네이션 장치 사이의 링크의 품질에 관한 정보를 포함하는 응답 프레임을 수신하는 단계를 포함하는 소스 장치의 통신 방법.
- 제2항에 있어서,상기 제1 링크 및 상기 제2 링크 중 어느 하나의 링크를 선택하는 단계는상기 선택된 링크를 통해 상기 데스티네이션 장치에게 송신한 이전 데이터에 대한 애크(ACK) 신호 또는 채널의 상태를 추정하기 위한 프레임으로부터 얻은 링크 품질 정보에 기초하여 상기 제1 링크 및 상기 제2 링크 중 어느 하나의 링크를 선택하는 단계인 포함하는 소스 장치의 통신 방법.
- 제6항에 있어서,상기 어느 하나의 링크를 선택하는 단계는상기 링크가 차단(block)되었는지 여부 또는 상기 링크의 품질이 미리 설정된 링크의 품질에 해당하는지 여부에 따라 상기 어느 하나의 링크를 선택하는 단계인 소스 장치의 통신 방법.
- 제2항에 있어서,상기 제1 링크 및 상기 제2 링크 중 어느 하나의 링크를 선택하는 단계는상기 제1 링크 또는 상기 제2 링크가 이용 가능하지 아니한(Unavailable) 것으로 판단되면, 상기 이용 가능하지 않음이 확인된 순간이 속한 링크 체인지 인터벌의 다음 링크 체인지 인터벌에서 상기 선택된 링크를 상기 선택되지 않은 링크로 스위칭 하는 단계를 포함하는 소스 장치의 통신 방법.
- 제2항에 있어서,상기 제1 링크 및 상기 제2 링크 중 어느 하나의 링크를 상기 선택된 링크로 스위칭 하는 단계는선택되지 않은 링크를 통해 미리 획득한 빔 포밍의 결과에 따라 상기 소스 장치의 지향성 안테나 방향을 조정하여 상기 선택되지 않은 링크를 통해 데이터의 송신 안테나 이득을 높이는 단계를 포함하는 소스 장치의 통신 방법.
- 제2항에 있어서,상기 미리 설정된 링크 체인지 인터벌 또는 상기 데스티네이션 장치가 상기 선택된 링크를 통해 데이터가 전송되었는지 여부를 감지하기 위한 데이터 센싱 타임(data sensing time)을 포함하는 매개변수 (parameter)들을 상기 데스티네이션 장치 및 상기 릴레이 장치에게 알려주는 단계를 포함하는 소스 장치의 통신 방법.
- 제2항에 있어서,상기 선택된 링크를 이용하여 데이터를 전송하는 단계는상기 데스티네이션 장치가 상기 선택된 링크를 통해 데이터가 전송되었는지 여부를 감지하기 위한 데이터 센싱 타임(data sensing time) 또는 상기 데스티네이션 장치가 상기 선택된 링크에서 선택되지 않은 링크로 스위칭 하는데 소요되는 스위칭 타임(switching time)을 고려한 시간 후에 상기 선택된 링크를 이용하여 데이터를 전송하는 단계인 소스 장치의 통신 방법.
- 제2항에 있어서,상기 데스티네이션 장치 및 상기 릴레이 장치에게 상기 데이터를 전송하는데 이용되는 동작 모드 및 상기 릴레이 장치의 중계 방식에 대한 정보를 전송하는 단계를 더 포함하는 소스 장치의 통신 방법.
- 제12항에 있어서,상기 릴레이 장치의 중계 방식은상기 미리 설정된 링크 체인지 인터벌(Link Change Interval)에서 상기 제1 링크를 상기 제2 링크로 스위칭하고, 상기 데스티네이션 장치가 상기 제1 링크를 통해 데이터가 전송되었는지 여부를 감지하기 위한 데이터 센싱 타임(data sensing time) 이후에 상기 제2 링크로 상기 데이터를 전송하는 풀 듀플렉스(Full Duplex) 방식 및상기 송신 장치가 상기 제1 링크를 이용하는 경우에는 상기 풀 듀플렉스 방식과 동일한 방식으로 상기 데이터를 전송하고, 상기 송신 장치가 상기 제2 링크를 이용하는 경우에는 상기 소스 장치와 상기 릴레이 장치 사이의 릴레이 링크를 위한 제1 주기 및 상기 릴레이 장치와 상기 데스티네이션 장치 사이의 릴레이 링크를 위한 제2 주기에 따라 상기 데이터를 전송하는 하프 듀플렉스(Half Duplex) 방식 중 적어도 하나를 포함하는 소스 장치의 통신 방법.
- 제13항에 있어서,상기 제1 주기 및 상기 제2 주기는상기 하프 듀플렉스 방식이 사용될 경우, 상기 데이터를 전송하기 전에 획득한 빔 포밍의 결과 및 상기 데이터를 전송하는 중에 획득한 링크의 품질 정보 중 적어도 하나에 기초하여 설정 또는 갱신되고,상기 제1 주기는상기 소스 장치가 상기 제1 링크를 상기 제2 링크로 스위칭 하였을 때 시작되며,상기 미리 설정된 링크 체인지 인터벌(Link Change Interval)은상기 소스 장치가 상기 제2 링크에서 상기 제1 링크로 링크를 스위칭 하였을 때 다시 시작되는 소스 장치의 통신 방법.
- 제12항에 있어서,상기 동작 모드는상기 제1 링크 또는 상기 제2 링크 중 어느 하나의 링크가 이용 가능하지 아니한 것으로 결정될 때까지 상기 어느 하나의 링크를 이용하여 상기 데스티네이션 장치에게 상기 데이터를 전송하는 노말 모드(normal mode) 및상기 미리 설정된 링크 체인지 인터벌의 시작 시점마다, 상기 제1 링크(direct link)와 상기 제2 링크를 교대(alternate)로 사용하며 상기 데스티네이션 장치에게 상기 데이터를 전송하는 교환 모드(alternation mode) 중 적어도 하나를 포함하는 소스 장치의 통신 방법.
- 제15항에 있어서,상기 소스 장치가 상기 교환 모드에 따라 상기 데이터의 전송을 재개(resume)할 것을 결정한 경우,상기 데스티네이션 장치에게 상기 선택된 링크에서의 동작이 재개되었음을 알리기 위하여, 상기 링크 체인지 인터벌의 다음 링크 체인지 인터벌의 데이터 센싱 타임 후에 상기 데이터를 전송하는 단계를 포함하는 소스 장치의 통신 방법.
- 제1항에 있어서,상기 제2 링크에 연결된 릴레이 장치에게 상기 릴레이 장치가 수신한 데이터가 상기 데스티네이션 장치에게 전달되었는지 여부를 파악하기 위한 요청 프레임을 전송하는 단계; 및상기 요청 프레임에 응답하여, 상기 릴레이 장치로부터 상기 데이터가 상기 데스티네이션 장치에게 전달 되었는지 여부를 나타내는 응답 프레임을 수신하는 단계를 포함하는 소스 장치의 통신 방법.
- 소스 장치로부터 데스티네이션 장치로 직접 연결되는 제1 링크 또는 상기 소스 장치로부터 상기 데스티네이션 장치로 릴레이 장치를 거쳐서 연결되는 제2 링크 중 상기 소스 장치에 의해 선택된 링크가 이용 가능한지 여부를 판단하는 단계; 및상기 판단 결과에 기초하여 데이터를 수신하는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 제18항에 있어서,상기 소스 장치에 의해 선택된 링크가 이용 가능한지 여부를 판단하는 단계는미리 설정된 링크 체인지 인터벌(Link Change Interval) 구간의 시작부터 데이터 센싱 타임(data sensing time)이 경과할 때까지의 시간 동안 상기 선택된 링크를 통하여 상기 데이터를 수신하였는지의 여부에 따라 상기 선택된 링크가 이용 가능한지 여부를 판단하는 단계인 데스티네이션 장치의 통신 방법.
- 제18항에 있어서,상기 판단 결과에 기초하여 상기 데이터를 수신하는 단계는상기 소스 장치가 상기 선택된 링크로 스위칭 하였는지 여부를 확인하는 단계; 및상기 소스 장치가 상기 선택된 링크로 스위칭 하였다고 확인되면, 상기 데스티네이션 장치의 지향성 안테나를 상기 선택된 링크를 향한 방향으로 향하도록 하여 상기 데이터의 수신을 대기하는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 제19항에 있어서,상기 소스 장치가 상기 제2 링크에서 상기 제1 링크로 스위칭 하는지 여부를 확인하기 위해 매 제1 주기의 시작에 상기 데스티네이션 장치의 링크를 상기 제2 링크에서 상기 제1 링크로 스위칭하는 단계; 및상기 소스 장치로부터 상기 제1 링크를 통하여 이용 가능한 데이터를 수신하지 못하면, 다음 제1 주기 및 다음 제2 주기 중 상기 다음 제2 주기의 시작에서 상기 데스티네이션 장치의 링크를 상기 제1 링크에서 상기 제2 링크로 스위칭하는 단계를 더 포함하고,상기 다음 제1 주기에서 상기 소스 장치는 상기 릴레이 장치로 데이터를 전송하고, 상기 다음 제2 주기에서 상기 릴레이 장치는 상기 데스티네이션 장치로 데이터를 전송하는 데스티네이션 장치의 통신 방법.
- 제21항에 있어서,상기 매 제1 주기의 시작에 상기 데스티네이션의 링크를 상기 제2 링크에서 상기 제1 링크로 스위칭하는 단계는상기 소스 장치로부터 상기 제1 링크를 통하여 이용 가능한 데이터를 수신한 경우, 상기 제1 링크에서 데이터를 수신하는 제1 주기의 시작 시점부터 상기 링크 체인지 인터벌이 시작되는 것으로 간주하는 단계를 포함하는 데스티네이션 장치의 통신 방법
- 제18항에 있어서,상기 소스 장치로부터 상기 데이터를 전송하는데 이용되는 동작 모드 및 상기 릴레이 장치의 중계 방식에 대한 정보를 수신하는 단계를 더 포함하는 데스티네이션 장치의 통신 방법.
- 제23항에 있어서,상기 릴레이 장치의 중계 방식은미리 설정된 링크 체인지 인터벌(Link Change Interval)에서 상기 제1 링크를 상기 제2 링크로 스위칭하고, 상기 데스티네이션 장치가 상기 제1 링크를 통해 데이터가 전송되었는지 여부를 감지하기 위한 데이터 센싱 타임(data sensing time) 이후에 상기 제2 링크로 상기 데이터를 전송하는 풀 듀플렉스(Full Duplex) 방식 및상기 송신 장치가 상기 제1 링크를 이용하는 경우에는 상기 풀 듀플렉스 방식과 동일한 방식으로 상기 데이터를 전송하고, 상기 송신 장치가 상기 제2 링크를 이용하는 경우에는 상기 소스 장치와 상기 릴레이 장치 사이의 릴레이 링크를 위한 제1 주기 및 상기 릴레이 장치와 상기 데스티네이션 장치 사이의 릴레이 링크를 위한 제2 주기에 따라 상기 데이터를 전송하는 하프 듀플렉스(Half Duplex) 방식 중 적어도 하나를 포함하는 데스티네이션 장치의 통신 방법.
- 제24항에 있어서,상기 제1 주기 및 상기 제2 주기는상기 소스 장치가 상기 데이터를 전송하기 전에 획득한 빔 포밍의 결과 및 상기 데이터를 전송하는 중에 획득한 링크의 품질 정보 중 적어도 하나에 기초하여 설정 또는 갱신하고,상기 제1 주기는상기 소스 장치가 상기 제1 링크를 상기 제2 링크로 스위칭 하였을 때 시작되는 데스티네이션 장치의 통신 방법.
- 제24항에 있어서,상기 제1 주기 및 제2 주기는상기 제1 링크가 선택된 링크인 경우 더 이상 이용 가능하지 않으며,상기 링크 체인지 인터벌은상기 소스 장치가 상기 제2 링크에서 상기 제1 링크로 링크를 스위칭하는 상기 제1 주기의 시작 시점부터 시작되는 데스티네이션 장치의 통신 방법.
- 제24항에 있어서,상기 동작 모드는상기 제1 링크 또는 상기 제2 링크 중 어느 하나의 링크가 이용 가능하지 아니한 것으로 결정될 때까지 상기 어느 하나의 링크를 이용하여 상기 소스 장치가 상기 데스티네이션 장치에게 상기 데이터를 전송하는 노말 모드(normal mode) 및상기 미리 설정된 링크 체인지 인터벌의 시작 시점마다, 상기 제1 링크(direct link)와 상기 제2 링크를 교대(alternate)로 사용하며 상기 소스 장치가 상기 데스티네이션 장치에게 상기 데이터를 전송하는 교환 모드(alternation mode) 중 적어도 하나를 포함하는 데스티네이션 장치의 통신 방법.
- 제27항에 있어서,상기 동작 모드가 상기 노말 모드이고, 상기 데스티네이션 장치가 상기 미리 설정된 링크 체인지 인터벌의 시작 시점으로부터 상기 데이터 센싱 타임 내에 상기 소스 장치로부터 이용 가능한 데이터를 수신하지 못한 경우, 상기 선택된 링크를 선택되지 않은 링크로 스위칭 하는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 제24항에 있어서,상기 릴레이 장치의 중계 방식이 하프 듀플렉스 방식인 경우,상기 선택된 링크가 상기 제2 링크이고, 이전 데이터 프레임의 More Data 필드의 값이 '0' 이면, 상기 제2 링크에서 상기 제2 주기 동안 데이터를 수신하지 않더라도 상기 제 1링크로 스위칭하지 않는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 제27항에 있어서,상기 동작 모드가 상기 노말 모드이고, 상기 소스 장치로부터 수신한 마지막 프레임의 MAC 헤더의 More Data 필드의 값이 '0'인 경우, 상기 선택된 링크에서 상기 데이터 센싱 타임(data sensing time) 동안 상기 데이터를 수신하지 않더라도 상기 선택된 링크를 유지하는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 제27항에 있어서,상기 동작 모드가 상기 교환 모드이고, 상기 소스 장치로부터 수신한 마지막 프레임의 MAC 헤더의 More Data 필드의 값이 '0'인 경우, 상기 미리 설정된 링크 체인지 인터벌의 다음 링크 체인지 인터벌에서 상기 선택된 링크를 유지하는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 제27항에 있어서,상기 동작 모드가 상기 교환 모드인 경우, 상기 데스티네이션 장치가 상기 미리 설정된 링크 체인지 인터벌의 시작에서 상기 선택된 링크를 통해 데이터를 수신하는 단계;상기 미리 설정된 링크 체인지 인터벌의 다음 링크 체인지 인터벌에서 선택되지 않은 링크로 스위칭하는 단계; 및상기 다음 링크 체인지 인터벌의 시작부터 데이터를 수신하는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 제27항에 있어서,상기 동작 모드가 교환 모드이고, 상기 데스티네이션 장치가 상기 제1 링크를 통해 상기 미리 설정된 링크 체인지 인터벌의 다음 링크 체인지 인터벌에서 상기 제2 링크의 데이터를 수신한 경우, 상기 교환 모드에 따라 상기 제2 링크로 스위칭하는 대신에 상기 제1 링크를 유지하는 단계를 포함하는 데스티네이션 장치의 통신 방법.
- 소스 장치가 상기 소스 장치로부터 데스티네이션 장치로 직접 연결되는 제1 링크 및 상기 소스 장치로부터 상기 데스티네이션 장치로 릴레이 장치를 거쳐서 연결되는 제2 링크 중 상기 제2 링크를 선택된 링크로 선택하는 경우, 미리 설정된 링크 체인지 인터벌의 시작 시점에서 상기 소스 장치로부터의 데이터 수신을 대기하는 단계; 및상기 데이터를 상기 데스티네이션 장치에게 전송하는 단계를 포함하는 릴레이 장치의 통신 방법.
- 제34항에 있어서,상기 소스 장치로부터의 데이터 수신을 대기하는 단계는상기 미리 설정된 링크 체인지 인터벌의 시작 시점부터 일정 시간 동안 상기 릴레이 장치의 지향성 안테나의 방향을 조정하여 상기 제2 링크에서 상기 소스 장치로부터의 데이터 수신을 대기하는 단계인 릴레이 장치의 통신 방법.
- 제34항에 있어서,상기 소스 장치로부터, 상기 소스 장치와 상기 릴레이 장치 사이의 릴레이 링크를 위한 제1 주기 및 상기 릴레이 장치와 상기 데스티네이션 장치 사이의 릴레이 링크를 위한 제2 주기에 대한 정보를 수신하는 단계;상기 제1 주기에서 상기 소스 장치로부터 상기 데이터를 수신하는 단계; 및상기 제2 주기에서 상기 데이터를 상기 데스티네이션 장치에게 전송하는 단계를 포함하는 릴레이 장치의 통신 방법.
- 제34항에 있어서,상기 소스 장치로부터, 상기 소스 장치가 상기 릴레이 장치에게 송신한 데이터가 데스티네이션 장치에게 전달되었는지 여부를 파악하기 위한 요청 프레임을 수신하는 단계; 및상기 요청 프레임에 응답하여 상기 데이터가 상기 데스티네이션 장치에게 전달 되었는지 여부를 나타내는 응답 프레임을 전송하는 단계를 포함하는 릴레이 장치의 통신 방법.
- 제 36항에 있어서,상기 릴레이 장치는상기 미리 설정된 링크 체인지 인터벌(Link Change Interval)에서 상기 제1링크를 상기 제2 링크로 스위칭하고, 상기 데스티네이션 장치가 상기 제1 링크를 통해 데이터가 전송되었는지 여부를 감지하기 위한 데이터 센싱 타임(data sensing time) 이후에 상기 제2 링크로 상기 데이터를 전송하는 풀 듀플렉스(Full Duplex) 방식 및상기 송신 장치가 상기 제1 링크를 이용하는 경우에는 상기 풀 듀플렉스 방식과 동일한 방식으로 상기 데이터를 전송하고, 상기 송신 장치가 상기 제2 링크를 이용하는 경우에는 상기 제1 주기 및 상기 제2 주기에 따라 상기 데이터를 전송하는 하프 듀플렉스(Half Duplex) 방식 중 적어도 하나의 중계 방식에 따라 동작하고,상기 중계 방식이 상기 풀 듀플렉스 방식인 경우,상기 미리 설정된 링크 체인지 인터벌의 시작 시점부터 일정 시간 동안 상기 릴레이 장치의 또 다른 하나의 지향성 안테나의 방향을 조정하여 상기 데스티네이션 장치를 향한 링크를 통하여 상기 데이터의 수신을 대기하는 단계를 포함하는 릴레이 장치의 통신 방법.
- 제38항에 있어서,상기 중계 방식이 상기 풀 듀플렉스 방식인 경우,상기 릴레이 장치가 수신한 각 프레임에 대하여 상기 프레임의 타입 및 애크(ACK) 신호에 대한 정책에 따라 상기 릴레이 장치의 지향성 안테나의 동작을 송/수신 상태로 전환하는 단계를 포함하는 릴레이 장치의 통신 방법.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19150010.7A EP3512119B1 (en) | 2010-02-05 | 2011-02-07 | Communication method among a source device, a destination device and a relay device |
US13/577,121 US8908550B2 (en) | 2010-02-05 | 2011-02-07 | Communication method among a source device, a destination device and a relay device |
CN201180012773.6A CN102792642B (zh) | 2010-02-05 | 2011-02-07 | 源装置、目的装置、及中继装置的通信方法 |
EP11740048.1A EP2533468B1 (en) | 2010-02-05 | 2011-02-07 | Communication method among a source device, a destination device and a relay device |
JP2012551924A JP5788909B2 (ja) | 2010-02-05 | 2011-02-07 | ソース装置、デスティネーション装置及びリレイ装置の通信方法 |
US14/550,365 US9584212B2 (en) | 2010-02-05 | 2014-11-21 | Communication method for source device, destination device and relay device |
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US10264510B2 (en) | 2013-11-06 | 2019-04-16 | Kt Corporation | Method and device for transmitting and receiving data in wireless LAN system |
US10721672B2 (en) | 2013-11-06 | 2020-07-21 | Kt Corporation | Method and device for transmitting and receiving data in wireless LAN system |
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JP6449949B2 (ja) | 2019-01-09 |
EP2533468A4 (en) | 2014-03-26 |
US20130039201A1 (en) | 2013-02-14 |
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EP3512119B1 (en) | 2021-12-22 |
JP2018014728A (ja) | 2018-01-25 |
WO2011096752A3 (ko) | 2011-12-01 |
US8908550B2 (en) | 2014-12-09 |
JP5788909B2 (ja) | 2015-10-07 |
JP2015167364A (ja) | 2015-09-24 |
EP2533468A2 (en) | 2012-12-12 |
US20150078193A1 (en) | 2015-03-19 |
JP6193952B2 (ja) | 2017-09-06 |
EP3512119A2 (en) | 2019-07-17 |
JP6655699B2 (ja) | 2020-02-26 |
EP3512119A3 (en) | 2019-10-02 |
US9584212B2 (en) | 2017-02-28 |
JP2013519290A (ja) | 2013-05-23 |
JP2016054492A (ja) | 2016-04-14 |
CN102792642B (zh) | 2016-08-17 |
JP5993977B2 (ja) | 2016-09-21 |
JP2019075794A (ja) | 2019-05-16 |
CN102792642A (zh) | 2012-11-21 |
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