WO2015068966A1 - 호핑 시퀀스 기반의 d2d 통신 방법 및 장치 - Google Patents
호핑 시퀀스 기반의 d2d 통신 방법 및 장치 Download PDFInfo
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- WO2015068966A1 WO2015068966A1 PCT/KR2014/009889 KR2014009889W WO2015068966A1 WO 2015068966 A1 WO2015068966 A1 WO 2015068966A1 KR 2014009889 W KR2014009889 W KR 2014009889W WO 2015068966 A1 WO2015068966 A1 WO 2015068966A1
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- hopping
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- 238000004891 communication Methods 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000004044 response Effects 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 20
- 230000015654 memory Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000007630 basic procedure Methods 0.000 description 1
- 230000010267 cellular communication Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B2001/6908—Spread spectrum techniques using time hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/713—Frequency hopping
- H04B2201/71338—Asynchronous systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and device for a device to device (D2D) communication based on a hopping sequence.
- D2D device to device
- a user accesses a server through a user terminal to download or upload desired content.
- This server-based communication environment is called an infrastructure communication environment.
- a user accesses a server mainly through a base station of cellular communication or an access point (AP) of a WLAN.
- AP access point
- D2D communication supports direct communication between user terminals.
- most D2D communication has been supported at the application layer. If D2D communication is only supported at the application layer, the server still acts as a relay to perform the connection between the user terminals and the operations at the user's physical (PHY) layer and the medium access control (MAC) layer may not be possible. May be the same as
- data may be directly transmitted and / or received between the user terminals without going through a server. That is, data for D2D communication is directly transmitted between user terminals without passing through a server, so that communication resources can be used more efficiently.
- transmission delay may be reduced and transmission power may also be saved because a relatively close distance is transmitted.
- the connection between the user terminal and the server is not necessary, a large amount of data can be transmitted to another user terminal without burdening charges due to data use from the user's point of view.
- a PHY layer and a MAC layer design for D2D communication should be performed in consideration of resource distribution, interference avoidance, and synchronization acquisition for D2D communication.
- An object of the present invention is to provide a hopping sequence-based D2D communication method.
- Another object of the present invention is to provide a hopping sequence-based D2D communication apparatus.
- a device to device (D2D) communication method based on a hopping sequence acquires information on a reference hopping sequence, and the reference hopping sequence is determined by the terminal.
- the terminal is the initial access terminal, and when the terminal performs the second D2D communication based on the second link with the other terminal before the first D2D communication,
- the terminal is the multi-access terminal, and the communicable hopping sequence may include a hopping sequence selectable to perform D2D communication over the same channel on at least one same slot as the reference sequence.
- the terminal for performing a hopping sequence-based device to device (D2D) communication in accordance with another aspect of the present invention for achieving the above object of the present invention
- the terminal is RF (RF) implemented to transmit or receive a radio signal a radio frequency) unit and a processor operatively connected to the RF unit, wherein the processor obtains information about a reference hopping sequence, wherein the reference hopping sequence is based on a first link based on the terminal.
- RF radio
- the present hopping sequence of the target terminal to perform the first D2D communication whether the initial access terminal or a multi-access terminal and the terminal is a communication hopping sequence of which the current hopping sequence of the terminal corresponding to the reference sequence and the reference hopping sequence Determine a final hopping sequence for performing the first D2D communication based on whether it is equal to at least one of And, it may be implemented to perform the first D2D communication based on the last hopping sequence, if the terminal does not perform a second link-based second D2D communication with the other terminal before the first D2D communication, When the terminal is the initial access terminal and the terminal performs the second D2D communication based on the second link with the other terminal before the first D2D communication, the terminal is the multi access terminal and the communicable hopping
- the sequence may include a hopping sequence selectable for performing D2D communication over the same channel on at least one same slot as the reference sequence.
- the terminal may determine the hopping sequence based on the hopping sequence of the target terminal for D2D communication.
- the terminal may determine a hopping sequence for D2D communication based on a table including a predetermined hopping sequence to effectively utilize a D2D communication resource to perform a plurality of link based D2D communication.
- 1 is a conceptual diagram illustrating D2D communication.
- FIG. 2 is a conceptual diagram illustrating channel hopping in D2D communication.
- 3 is a conceptual diagram illustrating channel hopping in D2D communication.
- FIG. 4 is a conceptual diagram illustrating D2D communication.
- 5 is a conceptual diagram illustrating communication between terminals.
- 6 is a conceptual diagram illustrating communication between terminals.
- FIG. 7 is a conceptual diagram illustrating a hopping method according to an embodiment of the present invention.
- FIG. 8 is a conceptual diagram illustrating a method of determining a hopping sequence of a terminal according to an embodiment of the present invention.
- FIG. 9 is a conceptual diagram illustrating a method of determining a hopping sequence of a terminal according to an embodiment of the present invention.
- FIG. 10 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
- D2D communication environment can have the following characteristics unlike infrastructure communication environment.
- the mobility of the D2D terminal may be large.
- a base station or an access point (AP) is fixed, but in a D2D communication, both a transmitting terminal and a receiving terminal have mobility.
- the mobility can be relatively increased.
- the terminal may have a multi-session.
- the terminal received all content through the base station / AP.
- one terminal may maintain a plurality of sessions (or links) simultaneously with a plurality of other terminals.
- one terminal may chat with another terminal through a plurality of sessions, and may transmit and receive different data from each other.
- the synchronization between terminals may be different.
- network synchronization between a plurality of terminals is performed based on a base station / AP.
- synchronization based on a base station and an AP is impossible.
- D2D communication is performed based on a carrier sense multiple access (CSMA) -collision avoidance (CA) system of IEEE 802.11.
- CSMA carrier sense multiple access
- CA collision avoidance
- 1 is a conceptual diagram illustrating D2D communication.
- terminal A 110 communicates with terminal B 120 based on channel 1, and terminal A 110 performs communication with terminal C 130 based on channel 2.
- the terminal may monitor (or sense) only one channel at a specific time. In other words, monitoring cannot be performed for two channels at the same time.
- a time resource for the terminal A 110 to communicate with the terminal B 120 through the channel 1 and a time resource for the terminal A 110 to communicate with the terminal C 130 through the channel 2 may overlap each other. none.
- the terminal A 110 may communicate with the terminal B 120 and the terminal C 130 through two communication methods.
- communication may be performed by setting the channels of two sessions to be the same. For example, when the operating channel of the terminal C 130 is changed to channel 1 based on a request of the terminal A 110, the terminal A 110 monitors only the channel 1 and the terminal B 120 and the terminal C ( 130 may be performed.
- This method may be effective in an environment where the number of terminals is small, but when the number of terminals increases, all the terminals operate on one channel. Therefore, communication performance is very poor and channel resources can be used inefficiently.
- the terminal A 110 may communicate with the terminal B 120 and the terminal C 130 by hopping the channel 1 and the channel 2 by themselves. As described above, when the terminal A 110 communicates with the terminal B 120 in the channel 1, the terminal A 110 may not communicate with the terminal C 130 in the channel 2. Similarly, when terminal A 110 communicates with terminal C 130 in channel 2, terminal A 110 may not communicate with terminal B 120 in channel 1. When the terminal B 120 and the terminal C 130 do not communicate with the terminal A 110, the terminal B 120 and the terminal C 130 may communicate with each other through another session with the other terminal. In the second communication method, when the terminal does not know information about channel hopping (or channel allocation) of another terminal with which to communicate, communication between terminals cannot be performed at a specific time in a specific channel. In addition, communication performance may be degraded if certain rules and standards for operating channels are not defined.
- FIG. 2 is a conceptual diagram illustrating channel hopping in D2D communication.
- FIG. 2 a basic procedure for D2D communication is disclosed from the perspective of a terminal.
- Three phases may be performed for D2D communication.
- Three stages for D2D communication may include a discovery phase 210, a peering phase 220, and a hopping phase 230.
- the UE may perform discovery for another UE while hopping all or some channels for D2D communication.
- the terminal performing the discovery may transmit a discovery request frame while hopping a channel for searching for another terminal.
- the other terminal receiving the discovery request frame may transmit a discovery response frame to the terminal.
- the terminal may perform the peering step 220 with respect to the target terminal to establish a session (or link) for D2D communication among other terminals discovered through the discovery step 210.
- the terminal may transmit a peering request frame to the target terminal.
- the terminal may receive a peering response frame from the target terminal.
- the hopping step 230 communication about actual traffic data between the terminal and the target terminal may be performed.
- the terminal may perform the inter-terminal communication while repeating the hopping step 230.
- the terminal may search again for the neighboring terminal by performing the discovery step 210 again.
- the time resource for discovery may be fixed to T.
- a time resource for data communication may be allocated to an integer multiple of T.
- a unit of time resource allocated by T time may be expressed by a term slot.
- the UE may use m slots as a time resource for communication.
- the plurality of channels may be three channels.
- a plurality of slots in which a hopping sequence is defined may be expressed by the term hopping slot set.
- the hopping sequence for channel hopping in the hopping step 230 may be expressed through parentheses, such as (x, x, x, x, x, x).
- the terminal may communicate with other terminals while sequentially moving to channel 1, channel 2, channel 3, channel 1, channel 2, and channel 3 on a hopping slot set including six slots.
- the hopping sequence of the terminal may be (1, 2, 3, 1, 2, 3).
- 3 is a conceptual diagram illustrating channel hopping in D2D communication.
- the terminal may perform the first hopping step 330 after performing the first discovery step 310 and the peering step 320.
- the hopping sequence may be (2,1,3,1) defined on a hopping slot set including four slots.
- communication between terminals may be performed on two hopping slot sets. That is, in the first hopping step 330, the UE may perform channel hopping twice based on a hopping sequence repeated twice on eight slots.
- the UE may again perform the second discovery step 350 and the second hopping step 360.
- FIG. 4 is a conceptual diagram illustrating D2D communication.
- D and H may mean a discovery phase and a hopping phase, respectively.
- the terminal A may search for neighboring terminals while sequentially hopping channels 1, 2, and 3 in the first discovery step 410.
- first discovery step 410 neighboring terminals may not be discovered by the terminal A in channels 1, 2, and 3.
- the link is not formed through the peering step and the terminal A may be directly switched to the first hopping step 420.
- the terminal A performs the discovery step 410 continuously, since the terminal A needs to transmit a discovery request frame while hopping the channel, power consumption may be large. Therefore, even when the terminal A fails to discover the target terminal during the discovery step 410, the terminal A may switch to the hopping phase 420 to reduce power consumption.
- the terminal A may monitor a frame of another terminal transmitted through the channel while operating in a reception mode or a low power mode in one channel without performing hopping.
- the hopping sequence of UE is (2, 2, 2, 2, 2, 2).
- the operating channel of the terminal A may be randomly selected or the channel having the lowest interference.
- the second search step 430 may be performed.
- the terminal A may search for neighboring terminals again through the second discovery step 430.
- 5 is a conceptual diagram illustrating communication between terminals.
- Terminal A may be a target terminal of terminal B.
- D is a search step
- H is a hopping step
- P is a peering step.
- Terminal B may perform a discovery step 550 on channels 1, 2, and 3.
- Terminal B may search for terminal A performing hopping step 520 on channel 2.
- the terminal B may hop to channel 2 after the discovery step 550 to form a link between the terminal A and the terminal B through the peering step 560.
- the terminal A and the terminal B may transmit or receive the traffic data in the hopping steps 520 and 570.
- each of the terminal A and the terminal B may obtain link information and / or information about a hopping sequence with the other terminal of the counterpart terminal.
- the terminal A and the terminal B may perform communication by setting the operation channel to one channel 2 without channel hopping in the hopping steps 520 and 570.
- channel hopping is performed in the terminal A and the terminal B, but the hopping sequence of the terminal A and the hopping sequence of the terminal B may be the same.
- UE A and UE B may define a hopping sequence to perform communication based on the newly defined hopping sequence.
- 6 is a conceptual diagram illustrating communication between terminals.
- Terminal A may be a target terminal of terminal C.
- UE C may discover UE A on channel 2 based on discovery steps 650 through channels 1, 2, and 3.
- the terminal C may know that the terminal A and the terminal B are in communication by forming a link through the discovery step 650 and / or the peering step 660.
- the terminal A may determine a new hopping sequence to communicate with the terminal B and the terminal C.
- UE A may operate by changing the hopping sequence from (2, 2, 2, 2, 2, 2) to (2, 3, 2, 3, 2, 3) in the hopping step 600. . That is, the terminal A may change the operation channel on the slot 2, slot 4 and slot 6 of the plurality of slots included in the hopping slot set to the channel 3 for communication with the terminal C.
- the overhead of changing the hopping sequence can be reduced by not changing the operation channels on slots 1, 3, and 5 of the plurality of slots included in the hopping slot set.
- the operating channels in slots 2, 4 and 6 may be randomly selected by terminal A or selected by terminal C.
- the terminal C may transmit information on a recommendation channel and information about a hopping sequence to the terminal A in the discovery step 650 and / or the peering step 660.
- UE A may determine the hopping sequence in consideration of information on the recommended channel transmitted from UE C.
- the UE A and the UE C may operate by setting the same operation channels in the slots 2, 4, and 6, or may operate by setting the operation channels in the slots 2, 4, and 6 differently. If the best channel is selected in each slot, data transmission efficiency may be increased, but overhead may occur due to channel hopping. On the contrary, when the same channel is selected in each slot, overhead due to channel hopping does not occur, but data transmission efficiency may be reduced.
- UE C may communicate with UE A in slots 2, 4, and 6 while operating in a hopping sequence of (3, 3, 3, 3, 3, 3) in the hopping step 670.
- Terminal C may leave slots 1, 3, and 5 later for communication based on a link with another terminal.
- Terminal C does not currently have a link with another terminal except terminal A. Accordingly, the terminal C may operate by setting the channel 3 as the operation channel in the slots 1, 3, and 5, without additional channel hopping.
- the hopping sequence for the terminal-to-terminal communication between the terminal A and the terminal C may be determined based on various methods.
- an embodiment of the present invention discloses a method in which a terminal determines a hopping sequence for D2D communication and performs D2D communication based on the determined hopping sequence.
- a search step and a peering step are omitted for convenience of description.
- FIG. 7 is a conceptual diagram illustrating a hopping method according to an embodiment of the present invention.
- the target terminal may be a terminal to which the terminal intends to perform D2D communication.
- an exemplary embodiment of the present invention discloses a hopping slot set including three slots and a hopping sequence defined on three channels and a communicable hopping sequence corresponding to the hopping sequence.
- D2D communication may be performed based on a hopping slot set including a plurality of slots and a hopping sequence defined on the plurality of channels and a communicable hopping sequence corresponding to the hopping sequence.
- Table 1 below shows a plurality of hopping sequences that can be used for D2D communication.
- Table 2 below shows the sequence ID of the communicable hopping sequence corresponding to each sequence ID of the reference sequence.
- Each sequence ID may correspond to each hopping sequence.
- the hopping sequence may be defined on a hopping slot set including three slots, and each element representing a channel included in the hopping sequence may correspond to each of a plurality of slots included in the slot set.
- the reference hopping sequence may be a hopping sequence as a reference for determining a hopping sequence of another terminal, and the communicable hopping sequence may be a hopping sequence determined based on the reference sequence.
- the sequence ID of the reference hopping sequence may indicate a hopping sequence corresponding to the sequence ID disclosed in Table 1.
- the reference hopping sequence N may indicate a hopping sequence corresponding to the sequence ID N.
- sequence ID of the communicable hopping sequence may also indicate a hopping sequence corresponding to the sequence ID disclosed in Table 1.
- the communicable hopping sequence N may be a hopping sequence corresponding to the sequence ID N.
- UE 1 operating based on reference hopping sequence 1 (1, 2, 3) may channel-hop from channel 1 to channel 1, channel 2, and channel 3, respectively. Can be performed. That is, in the hopping step, the terminal 1 may perform communication between terminals through channel 1 on slot 1, channel 2 on slot 2, and channel 3 on slot 3.
- the reference hopping sequence 1 may correspond to the communicable hopping sequences 2, 3, and 6.
- the terminal intending to perform communication between the terminal 1 and the terminal may operate based on one of the communicable hopping sequences 2, 3, and 6.
- the terminal 2 may perform communication between the terminal 1 and the terminal based on the communicable hopping sequence 2 (1, 3, 2).
- Terminal 2 performing channel hopping based on the communicable hopping sequence 2 may perform channel hopping to channels 1, 3, and 2 in each slot. That is, in the hopping step, the terminal 2 may perform communication between terminals through channel 1 on slot 1, channel 3 on slot 2, and channel 2 on slot 3.
- the terminal 1 and the terminal 2 may perform the terminal-to-terminal communication through the channel 1 on the slot 1.
- UE 3 when UE 3 additionally wants to perform communication between UE 1 and UE 3, UE 3 may perform communication hopping sequence 3 (2, 1, 3). It can work based on. When UE 3 operates based on the communicable hopping sequence 3 (2, 1, 3), UE 3 may perform inter-terminal communication through channel 2 on slot 1, channel 1 on slot 2, and channel 3 on slot 3. Can be.
- UE 1 and UE 3 may perform communication over channel 3 on slot 3.
- the hopping sequence of UE 3 corresponding to the communicable hopping sequence 3 may be a reference hopping sequence. That is, in terms of terminal 4, terminal 3 may be a terminal operating based on reference hopping sequence 3. The terminal 4 may operate based on one of the communicable hopping sequences 1, 4, and 5 corresponding to the reference hopping sequence 3.
- terminal 4 When terminal 4 performs terminal-to-device communication in synchronization with terminal 3 based on the communicable hopping sequence 4, terminal 3 and terminal 4 may perform terminal-to-device communication through channel 2 on slot 1.
- communication between terminals according to an embodiment of the present invention may be performed based on a reference hopping sequence and a communicable hopping sequence corresponding to the reference hopping sequence.
- FIG. 8 is a conceptual diagram illustrating a method of determining a hopping sequence of a terminal according to an embodiment of the present invention.
- FIG. 8 illustrates a method of determining a hopping sequence of a terminal when the terminal does not have a link connected to another terminal for inter-terminal communication (that is, when the terminal performs initial access for inter-terminal communication).
- a terminal performing initial access for terminal-to-terminal communication may be expressed in terms of an initial access terminal.
- the initial access terminal When the initial access terminal wants to perform initial access for D2D communication to the target terminal in a state in which the initial access terminal does not already have a connected link, the initial access terminal is a target connection terminal which is a terminal connected to the target terminal and a hopping sequence of the target terminal to connect to It is possible to obtain information about the hopping sequence that they use.
- the target connection terminal may refer to another terminal that forms a link with the target terminal to perform communication between the terminals.
- the reference hopping sequence of the initial access terminal may be a hopping sequence of the target terminal.
- the initial access terminal may select one of the communicable hopping sequences not used by the target connection terminal among the communicable sequences corresponding to the reference hopping sequence used by the target terminal as the final hopping sequence.
- a communicable hopping sequence not used by the target connection terminal may be expressed in terms of a candidate communicable hopping sequence.
- the initial access terminal may randomly determine one candidate communicable hopping sequence among the plurality of candidate communicable hopping sequences as the final hopping sequence.
- the initial access terminal may determine one candidate communicable hopping sequence having a good communication channel state among the plurality of candidate communicable hopping sequences as the final hopping sequence in consideration of the state of the communication channel.
- the initial access terminal may determine one candidate communicable hopping sequence as the final hopping sequence and perform inter-terminal communication based on the final hopping sequence.
- the initial access terminal may select the reference hopping sequence used by the target terminal as the final hopping sequence.
- the initial access terminal and the target terminal may perform communication between terminals based on the same hopping sequence.
- the initial access terminal may determine a final hopping sequence as follows.
- the target terminal uses reference hopping sequence 3 (2, 1, 3) and the target connection terminal uses communication hopping sequence 1 (1, 2, 3).
- the target terminal and the target connection terminal may perform communication between the terminals through the channel 3 on the slot 3.
- the plurality of communicable hopping sequences corresponding to the reference hopping sequence 3 may be communicable hopping sequences 1, 4, and 5.
- the communicable hopping sequences 4 and 5 except for the communicable hopping sequence 1 used by the target connection terminal may be candidate communicable sequences.
- the final hopping sequence of the initial access terminal may be determined to be one of the communicable hopping sequences 4 and 5.
- the final hopping sequence of the initial access terminal is a communicable hopping sequence 4 (2, 3, 1).
- the target terminal and the initial access terminal may perform terminal-to-terminal communication on channel 1 on slot 1.
- the target terminal uses the reference hopping sequence 1 and the target connection terminal uses all the communicable hopping sequences 2, 3, and 6.
- the initial access terminal can randomly determine one of the communicable hopping sequences 2, 3, and 6 as the final hopping sequence.
- the initial access terminal may determine one of the communicable hopping sequences 2, 3, and 6 as the final hopping sequence in consideration of the channel state.
- FIG. 9 is a conceptual diagram illustrating a method of determining a hopping sequence of a terminal according to an embodiment of the present invention.
- an existing link for terminal-to-terminal communication is already established in the terminal (that is, when the terminal already communicates with the existing terminal based on a specific hopping sequence), and the terminal communicates with the target terminal.
- a method of determining a hopping sequence of a terminal is disclosed.
- a terminal that is communicating with an existing terminal based on a specific hopping sequence, and a terminal that wants to perform communication between a new target terminal and a terminal based on a new link may be expressed as a term multi access terminal.
- the multi-access terminal may obtain information about the reference hopping sequence (hopping sequence of the target terminal) and the communicable sequence corresponding to the reference hopping sequence.
- the multi-access terminal may determine whether the current hopping sequence is the same as either the reference hopping sequence or the communicable sequence corresponding to the reference hopping sequence.
- the multi-access terminal may determine whether the sequence ID of the current hopping sequence is the same as the sequence ID of the reference hopping sequence or the sequence ID of the communicable sequence corresponding to the reference hopping sequence.
- the multi-access terminal may communicate with the target terminal using the current hopping sequence. Accordingly, the multi-access terminal may perform communication between the target terminal and the terminal without changing a separate hopping sequence in the current hopping sequence.
- a multi-access terminal operates by setting a hopping sequence corresponding to sequence ID 1 (1, 2, 3) as the current hopping sequence, and the target terminal operates based on the reference hopping sequence 3.
- the communicable hopping sequence corresponding to the reference hopping sequence 3 may be the communicable hopping sequences 1, 4, and 5. Therefore, since the current hopping sequence of the multi-access terminal is the same as the communicable hopping sequence 1, the multi-access terminal can operate without changing the current hopping sequence.
- the multi-access terminal may change the current hopping sequence to determine the final hopping sequence.
- the final hopping sequence of the multi access terminal may be determined in consideration of the reference hopping sequence of the target terminal.
- the multi-access terminal uses the same hopping sequence as the reference hopping sequence (ie, the hopping sequence of the target terminal). You can change it to a sequence. That is, the final hopping sequence of the multi-access terminal may be a hopping sequence having the same sequence ID as the reference hopping sequence.
- the multi-access terminal changes the current hopping sequence into a final hopping sequence having the same sequence ID as the reference hopping sequence, thereby performing terminal-to- terminal communication with the existing terminal based on the existing link, and also based on the new link with the target terminal. Inter-communication can be performed.
- the multi-access terminal when the multi-access terminal changes the current hopping sequence into a final hopping sequence having the same sequence ID as the reference hopping sequence, the changed final sequence may have a relationship that is a communicable hopping sequence of the hopping sequence of the existing terminal. have. Accordingly, the multi-access terminal may change the current hopping sequence into a final hopping sequence having the same sequence ID as the reference hopping sequence to form a link with each of the existing terminal and the target terminal to perform communication between terminals.
- the current hopping sequence of the multi-access terminal is a hopping sequence of sequence ID 1 (1, 2, 3), and the reference hopping sequence is sequence ID 4 ( It may be assumed that the case is a hopping sequence of 2, 3, and 1) (ie, when the target terminal operates with reference hopping sequence 4).
- the hopping sequence of the existing terminal may be a hopping sequence corresponding to sequence ID 2, 3, or 6.
- FIG. 9 it is assumed that an existing terminal operates based on a hopping sequence corresponding to sequence ID 2 (1, 3, 2).
- the current hopping sequence (1, 2, 3) of the multi-access terminal may be the reference hopping sequence 4 (2, 3, 1) or the communication capable sequence 2 (1, 3, 2), 3 (2, 1) corresponding to the reference hopping sequence. , 3), or 6 (3, 2, 1).
- the multi-access terminal cannot perform communication between both the existing terminal and the target terminal and the terminal in the current hopping sequence. Accordingly, the multi-access terminal can change the current hopping sequence to the same hopping sequence as the reference hopping sequence. That is, the multi-access terminal may determine the hopping sequence (2, 3, 1) corresponding to the sequence ID 4 as the final hopping sequence.
- the hopping sequence corresponding to sequence ID 4 may be a communication sequence of the reference sequence.
- the hopping sequence of the existing terminal is a hopping sequence (1, 3, 2) corresponding to ID 2
- the communication sequence capable of operating the hopping sequence of the existing terminal as a reference sequence is the communication sequence 1, 4 or 5. Therefore, communication between the terminal and the multi-access terminal having determined the final sequence as the hopping sequence (2, 3, 1) corresponding to the sequence ID 4 can also be performed.
- the multi-access terminal may perform communication between the terminal as well as the target terminal as well as the existing terminal.
- the changed final sequence is the communicable hopping sequence of the hopping sequence of the existing terminal. Can have a relationship.
- FIG. 10 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
- the first terminal 1000 and the second terminal 1050 may be wireless devices that can implement the aforementioned embodiments.
- the first terminal 1000 includes a processor 1010, a memory 1020, and an RF unit 1030.
- the RF unit 1030 may be connected to the processor 1010 to transmit / receive a radio signal.
- the processor 1010 may implement the functions, processes, and / or methods proposed in the present invention.
- the processor 1010 may perform an operation of the terminal according to the embodiment of the present invention disclosed in FIGS. 7 to 9.
- the processor 1010 may be implemented to obtain information about the reference hopping sequence.
- the reference hopping sequence may be a current hopping sequence of a target terminal to perform first link-based first D2D communication with the terminal.
- the processor 1010 may determine whether the terminal is an initial access terminal or a multi-access terminal and whether the current hopping sequence of the terminal is the same as at least one of a reference sequence and a communicable hopping sequence corresponding to the reference hopping sequence. 1 may be implemented to determine the final hopping sequence for performing D2D communication.
- the processor 1010 may be implemented to perform the first D2D communication based on the final hopping sequence.
- the terminal When the terminal does not perform the second link-based second D2D communication with another terminal before the first D2D communication, the terminal is an initial access terminal, and the terminal is the second link-based second with the other terminal before the first D2D communication.
- the terminal When D2D communication is performed, the terminal may be a multi access terminal.
- the communicable hopping sequence may include a selectable hopping sequence for performing D2D communication over the same channel on at least one same slot as the reference sequence.
- the second terminal 1050 includes a processor 1060, a memory 1070, and an RF unit (radio frequency unit) 1080.
- the RF unit 1080 may be connected to the processor 1060 to transmit / receive a radio signal.
- the processor 1060 may implement the functions, processes, and / or methods proposed in the present invention.
- the processor 1060 may perform an operation of the terminal according to the embodiment of the present invention disclosed in FIGS. 7 to 9.
- the processor 1060 may be implemented to transmit information on the reference hopping sequence to the first terminal.
- the processor 1060 may be implemented to perform D2D communication with the first terminal.
- Processors 1010 and 1060 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices and / or converters to convert baseband signals and wireless signals to and from each other.
- the memories 1020 and 1070 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
- the RF unit 1030 and 1080 may include one or more antennas for transmitting and / or receiving a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in the memory 1020, 1070 and executed by the processor 1010, 1060.
- the memories 1020 and 1070 may be inside or outside the processors 1010 and 1060 and may be connected to the processors 1010 and 1060 by various well-known means.
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Abstract
Description
Claims (10)
- 호핑 시퀀스 기반의 D2D(device to device) 통신 방법은,
단말이 기준 호핑 시퀀스에 대한 정보를 획득하되, 상기 기준 호핑 시퀀스는 상기 단말과 제1 링크 기반의 제1 D2D 통신을 수행할 타겟 단말의 현재 호핑 시퀀스인, 단계
상기 단말이 초기 액세스 단말인지 멀티 액세스 단말인지 여부 및 상기 단말이 상기 단말의 현재 호핑 시퀀스가 상기 기준 시퀀스 및 상기 기준 호핑 시퀀스에 대응되는 통신 가능 호핑 시퀀스 중 적어도 하나와 동일한지 여부를 기반으로 상기 제1 D2D 통신을 수행하기 위한 최종 호핑 시퀀스를 결정하는 단계; 및
상기 단말이 상기 최종 호핑 시퀀스를 기반으로 상기 제1 D2D 통신을 수행하는 단계를 포함하되,
상기 단말이 상기 제1 D2D 통신 이전 다른 단말과 제2 링크 기반의 제2 D2D 통신을 수행하지 않은 경우, 상기 단말은 상기 초기 액세스 단말이고,
상기 단말이 상기 제1 D2D 통신 이전 상기 다른 단말과 상기 제2 링크 기반의 상기 제2 D2D 통신을 수행한 경우, 상기 단말은 상기 멀티 액세스 단말이고,
상기 통신 가능 호핑 시퀀스는 상기 기준 시퀀스와 적어도 하나의 동일한 슬롯 상에서 동일한 채널을 통해 D2D 통신을 수행하기 위해 선택 가능한 호핑 시퀀스를 포함하는 방법. - 제1항에 있어서,
상기 단말이 상기 초기 액세스 단말 또는 상기 멀티 액세스 단말이고, 상기 단말의 현재 호핑 시퀀스와 상기 기준 호핑 시퀀스 및 상기 통신 가능 호핑 시퀀스 중 적어도 하나와 동일한 경우, 상기 최종 호핑 시퀀스는 상기 현재 호핑 시퀀스와 동일한 것을 특징으로 하는 방법. - 제1항에 있어서,
상기 단말이 상기 초기 액세스 단말이고, 상기 단말의 현재 호핑 시퀀스와 상기 기준 시퀀스 및 상기 통신 가능 시퀀스 중 적어도 하나와 동일하지 않은 경우, 상기 최종 호핑 시퀀스는 상기 기준 호핑 시퀀스 또는 상기 통신 가능 호핑 시퀀스 중 하나와 동일한 것을 특징으로 하는 방법. - 제1항에 있어서,
상기 단말이 상기 멀티 액세스 단말이고, 상기 단말의 현재 호핑 시퀀스와 상기 기준 호핑 시퀀스 및 상기 통신 가능 호핑 시퀀스 중 적어도 하나와 동일하지 않은 경우, 상기 최종 호핑 시퀀스는 상기 기준 호핑 시퀀스와 동일한 것을 특징으로 하는 방법. - 호핑 시퀀스 기반의 D2D(device to device) 통신을 수행하는 단말에 있어서, 상기 단말은,
무선 신호를 송신 또는 수신하기 위해 구현된 RF(radio frequency)부; 및
상기 RF부와 동작 가능하도록(operatively) 연결되는 프로세서를 포함하되,
상기 프로세서는 기준 호핑 시퀀스에 대한 정보를 획득하되, 상기 기준 호핑 시퀀스는 상기 단말과 제1 링크 기반의 제1 D2D 통신을 수행할 타겟 단말의 현재 호핑 시퀀스이고,
초기 액세스 단말인지 멀티 액세스 단말인지 여부 및 상기 단말이 상기 단말의 현재 호핑 시퀀스가 상기 기준 시퀀스 및 상기 기준 호핑 시퀀스에 대응되는 통신 가능 호핑 시퀀스 중 적어도 하나와 동일한지 여부를 기반으로 상기 제1 D2D 통신을 수행하기 위한 최종 호핑 시퀀스를 결정하고,
상기 최종 호핑 시퀀스를 기반으로 상기 제1 D2D 통신을 수행하도록 구현되되,
상기 단말이 상기 제1 D2D 통신 이전 다른 단말과 제2 링크 기반의 제2 D2D 통신을 수행하지 않은 경우, 상기 단말은 상기 초기 액세스 단말이고,
상기 단말이 상기 제1 D2D 통신 이전 상기 다른 단말과 상기 제2 링크 기반의 상기 제2 D2D 통신을 수행한 경우, 상기 단말은 상기 멀티 액세스 단말이고,
상기 통신 가능 호핑 시퀀스는 상기 기준 시퀀스와 적어도 하나의 동일한 슬롯 상에서 동일한 채널을 통해 D2D 통신을 수행하기 위해 선택 가능한 호핑 시퀀스를 포함하는 단말. - 제6항에 있어서,
상기 단말이 상기 초기 액세스 단말 또는 상기 멀티 액세스 단말이고, 상기 단말의 현재 호핑 시퀀스와 상기 기준 호핑 시퀀스 및 상기 통신 가능 호핑 시퀀스 중 적어도 하나와 동일한 경우, 상기 최종 호핑 시퀀스는 상기 현재 호핑 시퀀스와 동일한 것을 특징으로 하는 단말. - 제6항에 있어서,
상기 단말이 상기 초기 액세스 단말이고, 상기 단말의 현재 호핑 시퀀스와 상기 기준 시퀀스 및 상기 통신 가능 시퀀스 중 적어도 하나와 동일하지 않은 경우, 상기 최종 호핑 시퀀스는 상기 기준 호핑 시퀀스 또는 상기 통신 가능 호핑 시퀀스 중 하나와 동일한 것을 특징으로 하는 단말. - 제6항에 있어서,
상기 단말이 상기 멀티 액세스 단말이고, 상기 단말의 현재 호핑 시퀀스와 상기 기준 호핑 시퀀스 및 상기 통신 가능 호핑 시퀀스 중 적어도 하나와 동일하지 않은 경우, 상기 최종 호핑 시퀀스는 상기 기준 호핑 시퀀스와 동일한 것을 특징으로 하는 단말.
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