WO2022176026A1 - Traducteur de réseau et traducteur de dispositif - Google Patents

Traducteur de réseau et traducteur de dispositif Download PDF

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Publication number
WO2022176026A1
WO2022176026A1 PCT/JP2021/005744 JP2021005744W WO2022176026A1 WO 2022176026 A1 WO2022176026 A1 WO 2022176026A1 JP 2021005744 W JP2021005744 W JP 2021005744W WO 2022176026 A1 WO2022176026 A1 WO 2022176026A1
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WIPO (PCT)
Prior art keywords
translator
clock deviation
time
network
message
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PCT/JP2021/005744
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English (en)
Japanese (ja)
Inventor
家佳 宋
大介 滝田
慎 久保見
ジェフリ ジャオ
竜真 松下
善文 堀田
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2021/005744 priority Critical patent/WO2022176026A1/fr
Priority to JP2023500153A priority patent/JP7258261B2/ja
Priority to KR1020237026915A priority patent/KR102628183B1/ko
Priority to TW110118981A priority patent/TW202234920A/zh
Publication of WO2022176026A1 publication Critical patent/WO2022176026A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/002—Mutual synchronization
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H04L7/007—Detection of the synchronisation error by features other than the received signal transition detection of error based on maximum signal power, e.g. peak value, maximizing autocorrelation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • This disclosure relates to a 5G-TSN translator that considers clock deviation.
  • the link delay of each section and the clock deviation of each section are calculated by exchanging delay measurement messages between adjacent devices.
  • the slave obtains the time notified from the master device, it corrects the time difference with the master device using the integrated value of the link delay in each upstream section and the integrated value of the clock deviation in each upstream section. This realizes highly accurate time synchronization.
  • TSN is an abbreviation for Time-Sensitive Networking.
  • a 5G-TSN system is a TSN system in which TSN devices are connected by wire via 5G.
  • the 5G section is treated as one-stage virtual equipment. Physically, however, in the 5G section, a device network translator (NW-TT) is arranged on one side across the wireless section, and a device translator (DS-TT) is arranged on the other side across the wireless section.
  • NW-TT device network translator
  • DS-TT device translator
  • a translator is a device having a wired TSN function, and is also called a TSN translator.
  • NW-TT and DS-TT use the fact that the equipment in the 5G section is synchronized with the time (5G time) that is independent of the time of the TSN, and by time stamping the 5G time, the link in the 5G section Measure latency.
  • Non-Patent Document 1 discloses a conventional 5G-TSN network.
  • a conventional 5G-TSN network it is assumed that the clock deviation of each of the NW-TT and DS-TT to the GrandMaster (GM) of the 5G network is zero.
  • the DS-TT then puts the clock deviation of the NW-TT with respect to the GM of the TSN into the time transfer message Sync/Follow_Up and sends the time transfer message downstream to the TSN slave.
  • the present disclosure aims to suppress synchronization time errors in TSN slaves downstream of DS-TT by considering clock deviations in 5G-TSN.
  • a network translator of the present disclosure is used in a mobile communication system provided upstream of a time synchronization network system and downstream of the time synchronization network system.
  • the upstream of the time synchronization network system has a master, which is a device serving as a time source of the time synchronization network system.
  • the mobile communication system has a time server serving as a time source for the mobile communication system and a device translator.
  • the device translator calculates the clock deviation between the master and the device translator using the clock deviation between the master and the time server and the clock deviation between the time server and the device translator, and the calculated clock deviation is set to generate a message, and the generated message is transmitted downstream of the time synchronization network system.
  • the network translator is a clock deviation calculation unit that calculates the clock deviation between the master and the time server; an intra-section communication unit that sets the clock deviation between the master and the time server to generate a message and transmits the generated message to the device translator.
  • FIG. 1 is a configuration diagram of a time synchronization network system 100 according to Embodiment 1;
  • FIG. 2 is a hardware configuration diagram of a translator 300 according to Embodiment 1.
  • FIG. 3 is a functional configuration diagram of a network translator 210 according to Embodiment 1.
  • FIG. 3 is a functional configuration diagram of a device translator 220 according to Embodiment 1.
  • FIG. 4 is a flowchart of clock deviation calculation according to the first embodiment;
  • 4 is a flowchart of link delay calculation according to the first embodiment; 4 is a flowchart of time adjustment according to Embodiment 1; 4 is a flowchart of additional message transmission (5G) according to Embodiment 1; 4 is a flowchart of additional message transmission (TSN) according to Embodiment 1; 4 is a flowchart of additional message transmission (TSN) according to Embodiment 1; 4 is a table showing a frame format of additional message Follow_Up (NW-TT ⁇ DS-TT) in Embodiment 1; 4 is a table showing a frame format of additional message Follow_Up (DS-TT ⁇ TSN) in Embodiment 1; 4 is a diagram showing a clock deviation R set in each PTP message according to the first embodiment; FIG. 4 is a supplementary diagram of the hardware configuration of the translator 300 according to the first embodiment; FIG.
  • Embodiment 1 The time synchronization network system 100 will be described with reference to FIGS. 1 to 13.
  • FIG. 1 A time synchronization network system 100 will be described with reference to FIGS. 1 to 13.
  • FIG. 1 A time synchronization network system 100 will be described with reference to FIGS. 1 to 13.
  • FIG. 1 A time synchronization network system 100 will be described with reference to FIGS. 1 to 13.
  • a time synchronization network system 100 is a time synchronization network system in which a plurality of network devices are connected via a mobile communication system.
  • a time-synchronized network system is a network system in which the times of a plurality of network devices are synchronized.
  • a network device is a device having a communication function.
  • the time synchronization network system 100 is a 5G-TSN system.
  • 5G is the fifth generation mobile communication system.
  • a fifth generation mobile communication system is an example of a mobile communication system.
  • TSN is a time synchronization network system called time sensitive networking.
  • the time synchronization network system 100 includes a TSN master 101, a first bridge 102, a TSN slave 121 and an Mth bridge 122. These are TSN's network equipment.
  • the TSN master 101 is a network device that serves as a time source in TSN, and is called a grandmaster (GM).
  • the side where the TSN master 101 is located is called "upstream”.
  • the TSN slave 121 is network equipment that synchronizes with the time of the TSN master 101 .
  • the side where the TSN slave 121 is located is called “downstream”.
  • the TSN master 101 is denoted as "GM”.
  • the TSN slave 121 is described as "SLAVE”.
  • the first bridge 102 is the first bridge counted from the TSN master 101 on the communication path from the TSN master 101 to the TSN slave 121 .
  • a bridge is a type of network device.
  • the Mth bridge 122 is the Mth bridge counted from the TSN master 101 on the communication path from the TSN master 101 to the TSN slave 121 .
  • the first bridge 102 is located upstream with respect to the 5G network 110 and the Mth bridge 122 is located downstream with respect to the 5G network 110 .
  • the first bridge 102 is denoted as "S1".
  • the Mth bridge 122 is denoted as "SM".
  • the time synchronization network system 100 includes a 5G time source 111, a network translator 210, and a device translator 220. These are the network equipment of the 5G network 110 .
  • the 5G time source 111 is a network device that serves as a time source for the 5G network 110, and is called a time server (TS).
  • the 5G time source 111 is referred to as "5G-TS”.
  • the 5G network 110 time is independent of the TSN time.
  • the network translator 210 is a translator that performs 5G-TSN inter-network connection, has a TSN time synchronization function, and is arranged upstream in the 5G network 110 .
  • the device translator 220 is a translator that performs 5G-TSN inter-network connection, has a TSN time synchronization function, and is arranged downstream in the 5G network 110 .
  • Network translator 210 and device translator 220 are also referred to as TSN translators (TT).
  • the network translator 210 is referred to as "NW-TT”.
  • Device translator 220 is referred to as “DS-TT”.
  • Translator 300 is a general term for network translator 210 and device translator 220 .
  • Translator 300 includes motherboard 310 and expansion card 320 .
  • Motherboard 310 is connected to computer 301 for control.
  • Motherboard 310 includes processor 311 , serial communication device 312 and translator circuit 313 . These are connected to each other via a bus. This bus is also called a data bus, and provides connection for register access (setting, reading) from the processor 311 .
  • the processor 311 is an electronic circuit that performs arithmetic processing, and includes a logic circuit, primary cache, and the like.
  • a serial communication device 312 is a device for performing serial communication. Specifically, serial communication device 312 is a UART. UART is an abbreviation for Universal Asynchronous Receiver/Transmitter.
  • the translator circuit 313 is an electronic circuit having a translator function. Specifically, the translator circuit 313 is an FPGA circuit, and the function of the translator is constructed with programmable logic. FPGA is an abbreviation for Field-Programmable Gate Array.
  • Expansion cards 320 are connected to motherboard 310 .
  • the expansion card 320 is connected to a dedicated connector provided on the motherboard 310 .
  • the expansion card 320 has ports 321 and 322 .
  • Port 321 is the port connected to TSN
  • port 322 is the port connected to 5G.
  • ports 321 and 322 are ports called SFP.
  • SFP is an abbreviation for Small Form Factor Pluggable.
  • the network translator 210 includes elements such as an out-of-section communication unit 211 , a delay measurement unit 212 , a time synchronization control unit 213 , a clock deviation calculation unit 214 , and an in-section communication unit 215 . These elements are realized by translator circuit 313 .
  • the outside section communication unit 211 performs transmission and reception with the TSN. Also, the outside communication unit 211 receives and analyzes the frame, extracts the header and message from the received PTP frame, and terminates. In addition, the out-of-section communication unit 211 performs error check and length measurement, and discards the error frame. In addition, the outside communication section 211 notifies the delay measurement section 212 of the transmission/reception time of the PTP frame. Therefore, the out-of-section communication unit 211 holds the 5G time (TSi) when the network translator 210 received the Sync message.
  • TSi 5G time
  • the delay measurement unit 212 measures delay times and clock deviations between adjacent TSN devices used for time synchronization using a two-step peer-to-peer (P2P) path delay algorithm called Pdelay_Req, Pdelay_Resp and Pdelay_Resp_Follow_Up.
  • the clock deviation is calculated based on the time difference of the P2P delay measurement messages.
  • the delay measurement unit 212 generates status information regarding transmission/reception control and delay measurement functions of PTP messages (Pdelay_Req, Pdelay_Resp, Pdelay_Resp_Follow_Up).
  • a PTP message is a message defined in IEEE 802.1 AS.
  • the delay measurement unit 212 measures the transmission delay between the network translator 210 and adjacent TSN devices to measure the link delay.
  • the time synchronization control unit 213 adds the accumulated clock deviation with the GM and the accumulated delay with the GM calculated by the own device to the time information (GM is the starting point) distributed from the adjacent TSN device (upstream), Calculate the time synchronized with the time. This allows the synchronization time to follow the GM.
  • the clock deviation calculation unit 214 uses the clock deviation between the own device and the GM calculated by the delay measurement unit 212 and the clock deviation between the own device and the 5G time source calculated by the intra-section communication unit 215, and the 5G time source and the GM Calculate the clock deviation of
  • the intra-section communication unit 215 provides the synchronized time to the 5G time source 111 .
  • the intra-section communication unit 215 calculates the clock deviation between its own device and the 5G time source.
  • the intra-section communication unit 215 stores the 5G time (TSi) when the network translator 210 receives the Sync message and the accumulated clock deviation between the GM and the 5G time source calculated by the clock deviation calculation unit 214 in the TLV1 area of the Follow_Up message. Add and send a Follow_Up message to 5G.
  • TSi 5G time
  • the device translator 220 includes elements such as an intra-interval communication unit 221 , a delay measurement unit 222 , a clock deviation calculation unit 223 and an extra-interval communication unit 224 . These elements are realized by translator circuit 313 .
  • the intra-section communication unit 221 transmits and receives with 5G.
  • the intra-section communication unit 221 from the TLV1 area of the received Follow_Up message, the 5G time (TSi) when the network translator 210 received the Sync message, the GM calculated by the network translator 210, and the cumulative clock deviation of the 5G time source and transmits the extracted information to the delay measurement unit 222 .
  • the delay measurement unit 222 receives the 5G time (TSe) at the time of transmission of the Sync message from the outside communication unit 224 .
  • the delay measurement unit 222 uses TSi received from the intra-section communication unit 221, the cumulative clock deviation of the GM received from the intra-section communication unit 221, the cumulative clock deviation of the 5G time source, and the TSe received from the outside communication unit 224. Calculate the delay time. Then, the delay measurement unit 222 transmits the delay time inside 5G to the outside communication unit 224 .
  • the clock deviation calculation unit 223 uses the cumulative clock deviation of the GM and the 5G time source received from the internal communication unit 221 and the clock deviation of the own device and the 5G time source received from the outside communication unit 224 to calculate the difference between the own device and the GM. Calculate the clock deviation of Then, the clock deviation calculation unit 223 transmits the clock deviation between its own device and the GM to the outside communication unit 224 .
  • the outside section communication unit 224 performs transmission and reception with downstream TSN devices. Also, the outside communication unit 224 receives and analyzes the PTP frame, extracts the header and message from the received PTP frame, and terminates. In addition, the out-of-section communication unit 224 performs error check and length measurement, and discards the error frame. In addition, the out-of-section communication unit 224 notifies the delay measurement unit 222 of the 5G time (TSe) at which the Sync message was transmitted. The outside communication unit 224 adds the internal 5G delay time calculated by the delay measurement unit 222 to the correction field of the Follow_Up message.
  • TSe 5G time
  • the out-of-interval communication unit 224 rewrites the TLV of the Follow_Up message to the clock deviation between its own device and the GM calculated by the clock deviation calculation unit 223 . Then, the out-of-section communication unit 224 transmits the Follow_Up message to downstream TSN devices. Also, the outside communication unit 224 is: A clock deviation between the own device and the 5G time source is calculated and transmitted to the clock deviation calculation unit 223 .
  • the operation procedure of the time synchronization network system 100 corresponds to the time synchronization method.
  • the clock deviation calculation is a process of calculating the clock deviation CD a between the network translator 210 and the adjacent TSN device, and is executed by the network translator 210 .
  • TSN equipment is TSN network equipment.
  • the adjacent TSN equipment is specifically the first bridge 102 .
  • step S111 the outside communication unit 211 receives the first delay measurement response message Pdelay_Resp from the adjacent TSN device.
  • the delay measurement response message Pdelay_Resp is a response to the delay measurement request message Pdelay_Req.
  • step S112 the outside section communication unit 211 acquires the first response reception time tn .
  • the first response reception time tn is the reception time of the first delay measurement response message Pdelay_Resp .
  • the translator 300 time is obtained from the local operating system (OS).
  • step S113 the out-of-interval communication unit 211 extracts the first response transmission time t'n from the payload of the first delay measurement response message Pdelay_Resp_Follow_Up.
  • the first response transmission time t'n is the transmission time (ResponseOriginTimestamp) of the delay measurement response message Pdelay_Resp, and is measured and set by the adjacent TSN device.
  • step S114 the outside communication section 211 waits for the Nth delay measurement response message Pdelay_Resp and receives the Nth delay measurement response message Pdelay_Resp.
  • N is an integer of 2 or more.
  • step S115 the out-of-interval communication unit 211 acquires the N-th response reception time tnn (PdelayRespEventIngressTimestamp).
  • the Nth response reception time tnn is the reception time of the Nth delay measurement response message Pdelay_Resp.
  • step S116 the out-of-interval communication unit 211 extracts the Nth request reception time t'nn from the payload of the Nth delay measurement response message Pdelay_Resp_Follow_Up.
  • the N-th response transmission time t'nn is the transmission time (ResponseOriginTimestamp) of the delay measurement response message Pdelay_Resp, and is measured and set by the adjacent TSN device.
  • step S117 the delay measurement unit 212 uses the first response reception time tn, the first response transmission time t'n, the Nth response reception time tnn, and the Nth response transmission time t'nn to determine the clock deviation.
  • Clock deviation CDa is the clock deviation of network translator 210 and adjacent TSN devices.
  • the clock deviation CD a is calculated by calculating equation (a) below.
  • CDa ( tnn -tn)/( t'nn - t'n ) (a)
  • the clock deviation RNW_GM corresponds to the clock deviation CDa .
  • NW-TT sends a delay measurement request message Pdelay_Req.
  • the transmission time is time t1.
  • the GM receives the delay measurement request message Pdelay_Req.
  • the reception time is time t2.
  • the GM sends a first delay measurement response message Pdelay_Resp.
  • the transmission time is time t'n .
  • the NW-TT receives the first delay measurement response message Pdelay_Resp.
  • the reception time is time tn .
  • the GM sends the Nth delay measurement response message Pdelay_Resp.
  • the transmission time is time t'nn .
  • the NW-TT receives the Nth delay measurement response message Pdelay_Resp.
  • the reception time is time tnn .
  • the clock deviation RNW_GM is calculated by calculating equation (a) above.
  • Link delay calculation is a process of calculating the link delay LD b between the network translator 210 and the adjacent TSN device, and is executed by the network translator 210 .
  • the link delay LD b corresponds to the transmission delay time.
  • step S121 the outside section communication unit 211 transmits a delay measurement request message Pdelay_Req to the adjacent TSN device.
  • step S122 the outside section communication unit 211 acquires the request transmission time t1.
  • the request transmission time t1 is the transmission time of the delay measurement request message Pdelay_Req.
  • step S123 the out-of-section communication unit 211 waits for the delay measurement response message Pdelay_Resp from the adjacent TSN device and receives the delay measurement response message Pdelay_Resp.
  • step S124 the outside section communication unit 211 acquires the response reception time t4.
  • the response reception time t4 is the reception time of the delay measurement response message Pdelay_Resp .
  • step S125 the out-of-interval communication unit 211 extracts the request reception time t2 from the payload of the delay measurement response message Pdelay_Resp.
  • the request reception time t2 is the reception time ( RequestReceiptTimestamp ) of the delay measurement request message Pdelay_Req, and is measured and set by the adjacent TSN device.
  • step S126 the out-of-interval communication unit 211 waits for the additional message Pdelay_Resp_Follow_Up of the delay measurement response message Pdelay_Resp and receives the additional message Pdelay_Resp_Follow_Up.
  • step S127 the out-of-interval communication unit 211 extracts the response transmission time t3 from the payload of the additional message Pdelay_Resp_Follow_Up .
  • the response transmission time t3 is the transmission time (ResponseOriginTimeStamp) of the delay measurement response message Pdelay_Resp , which is measured and set by the adjacent TSN device.
  • step S1208 the delay measuring unit 212 calculates the link delay LDb using the clock deviation CDa , the request transmission time t1, the response reception time t4, the request reception time t2 , and the response transmission time t3.
  • Link delay LD b is the link delay between network translator 210 and adjacent TSN equipment.
  • the link delay LD b is calculated by calculating equation (b) below.
  • LD b (CD a ⁇ (t 4 ⁇ t 1 ) ⁇ (t 2 ⁇ t 3 ))/2 (b)
  • Time adjustment is a process of synchronizing the time of the network translator 210 with the time of the TSN master 101 and is executed by the network translator 210 .
  • step S131 the out-of-section communication unit 211 receives the synchronization message Sync from the adjacent TSN device.
  • step S132 the out-of-section communication unit 211 acquires the synchronous reception time TSi.
  • the synchronous reception time TSi is the 5G time when the synchronization message Sync is received.
  • step S133 the outside communication unit 211 waits for the additional message Follow_Up of the synchronization message Sync and receives the additional message Follow_Up. Then, the out-of-section communication unit 211 transmits the synchronization message Sync to 5G.
  • step S134 the out-of-interval communication unit 211 extracts the cumulative clock deviation ACD' from the additional message Follow_Up.
  • Cumulative clock deviation ACD′ is the cumulative clock deviation of TSN master 101 and adjacent TSN devices of network translator 210 .
  • step S135 the delay measuring unit 212 calculates the cumulative clock deviation ACDc using the clock deviation CDa and the cumulative clock deviation ACD'.
  • Cumulative clock deviation ACD c is the cumulative clock deviation of network translator 210 and TSN master 101 .
  • ACDc ACD' x CDa ( c )
  • step S136 the out-of-interval communication unit 211 extracts the accumulated delay value AD' from the Correction field of the additional message follow_Up.
  • the accumulated delay value AD′ is the accumulated delay value between the TSN device adjacent to the network translator 210 and the TSN master 101 .
  • step S137 the delay measurement unit 212 calculates an integrated delay ADd using the integrated delay value AD', the link delay LDb , and the integrated clock deviation ACDc .
  • the accumulated delay AD d is the accumulated delay between network translator 210 and TSN master 101 .
  • ADd AD' + ( LDb * ACDc ) (d)
  • step S138 the outside communication unit 211 extracts the time TG from the additional message Follow_Up.
  • Time TG is the time of TSN master 101 .
  • the time synchronization control section 213 uses the time TG and the integrated delay AD d to calculate the synchronization time ST e .
  • Synchronization time ST e is calculated by calculating the following formula (e).
  • ST e TG + AD d (e)
  • step S139 the time synchronization control unit 213 updates the time of the network translator 210 to the synchronization time STe to synchronize the time.
  • Send additional message (5G) is the process of sending an additional message Follow_Up from network translator 210 within 5G network 110 and is performed by network translator 210 .
  • step S141 the intra-interval communication unit 215 calculates the clock deviation CD f .
  • the clock deviation CD f is the clock deviation between the 5G time source 111 and the network translator 210 .
  • step S142 the clock deviation calculator 214 uses the cumulative clock deviation ACD c and the clock deviation CD f to calculate the clock deviation CD g .
  • the clock deviation CD g is the clock deviation between the TSN master 101 and the 5G time source 111 .
  • the clock deviation CD g is calculated by calculating equation (g) below.
  • CDg ACDc x CDf (g)
  • step S143 the intra-section communication unit 215 generates an additional message Follow_Up.
  • the intra-section communication unit 215 operates as follows.
  • the intra-interval communication unit 215 sets the synchronous reception time TSi acquired in step S132 (see FIG. 8) in the TLV2 field of the additional message follow_Up.
  • the intra-interval communication unit 215 sets the clock deviation CD g calculated in step S142 in the TLV1 field of the additional message follow_Up.
  • the intra-interval communication unit 215 sets the accumulated delay AD d calculated in step S137 (see FIG. 8) in the Correction field of the additional message follow_Up.
  • step S ⁇ b>144 the intra-section communication unit 215 transmits the additional message Follow_Up to the device translator 220 .
  • FIG. Send Additional Message is the process of sending an additional message Follow_Up from device translator 220 to TSN and is performed by device translator 220 .
  • step S ⁇ b>201 the intra-section communication unit 221 receives the synchronization message Sync transmitted from the network translator 210 .
  • step S202 the intra-section communication unit 221 waits for the additional message Follow_Up transmitted from the network translator 210 and receives the additional message Follow_Up. After step S202, the process proceeds to step S203 and step S211.
  • step S203 the intra-section communication unit 221 extracts information from the additional message Follow_Up. After step S203, the process proceeds to step S221.
  • the intra-section communication unit 221 operates as follows.
  • the intra-interval communication unit 221 extracts the synchronous reception time TSi from the TLV2 field of the additional message follow_Up.
  • the intra-interval communication unit 221 extracts the clock deviation CD g from the TVL1 field of the additional message follow_Up.
  • the intra-interval communication unit 221 extracts the accumulated delay AD d from the Correction field of the additional message follow_Up.
  • step S211 the out-of-section communication unit 224 transmits a synchronization message Sync to TSN. That is, the outside section communication unit 224 transmits the synchronization message Sync to downstream TSN devices. Specifically, the outside section communication unit 224 transmits the synchronization message Sync to the Mth bridge 122 .
  • step S212 the out-of-section communication unit 224 acquires the synchronous transmission time TSe.
  • the synchronous transmission time TSe is the 5G time when the synchronization message Sync is transmitted.
  • step S213 the delay measurement unit 222 calculates the internal delay ID h using the synchronous transmission time TSe and the synchronous reception time TSi extracted in step S203.
  • Internal delay ID h is the delay incurred in the 5G network 110 .
  • the internal delay ID h is the difference between the synchronous transmission time TSe and the synchronous reception time TSi.
  • ID h TSe-TSi (h)
  • step S214 the delay measurement unit 222 calculates the integrated delay AD k using the internal delay ID h , the integrated delay AD d extracted in step S203, and the clock deviation CD g extracted in step S203.
  • Accumulated delay AD k is the accumulated delay of device translator 220 and TSN master 101 .
  • ADk ADd + ( IDh x CDg ) (k)
  • step S221 the section outside communication section 224 calculates the clock deviation CD i .
  • the clock deviation CD i is the clock deviation between the 5G time source 111 and the device translator 220 .
  • step S222 the out-of-interval communication unit 224 uses the clock deviation CD i and the clock deviation CD g extracted in step S203 to calculate the clock deviation CD j .
  • Clock deviation CD j is the clock deviation between TSN master 101 and device translator 220 .
  • the clock deviation CD j is calculated by calculating equation (j) below.
  • CD j CD g ⁇ CD i Formula (j)
  • step S223 the out-of-section communication unit 224 generates an additional message follow_Up.
  • the outside section communication unit 224 operates as follows.
  • the out-of-interval communication unit 224 sets the clock deviation CD j calculated in step S222 in the TLV1 field of the additional message follow_Up.
  • the out-of-interval communication unit 224 sets the accumulated delay AD k calculated in step S214 in the Correction field of the additional message follow_Up.
  • the outside communication unit 224 deletes TLV2 of Follow_Up.
  • step S224 the outside section communication unit 224 transmits the additional message Follow_Up to TSN. That is, the out-of-section communication unit 224 transmits the additional message Follow to the downstream TSN device. Specifically, the out-of-section communication unit 224 transmits the additional message Follow_Up to the Mth bridge 122 .
  • FIG. 12 shows the frame format of the additional message follow_Up from network translator 210 to device translator 220 .
  • the header contains a Correction field.
  • the Correction field is set with the accumulated delay AD d .
  • a clock deviation CD g is set in the TLV1 field.
  • a synchronous reception time TSi is set in the TLV2 field.
  • FIG. 13 shows the frame format of the additional message follow_Up from device translator 220 to TSN.
  • the header contains a Correction field.
  • An accumulated delay AD k is set in the Correction field.
  • a clock deviation CD j is set in the TLV1 field.
  • Time TM is the transmission time of the PTP message in the GM.
  • Time TS1 is the time when S1 is synchronized with GM.
  • Time TNW is the time when NW -TT is synchronized with GM.
  • Time TDS is the time when DS -TT is synchronized with GM.
  • Time T SN is the time when SN is synchronized with GM.
  • Delay D1 corresponds to the time from time TM to time TS1 .
  • the delay D 5G corresponds to the time from time T M to time T DS .
  • Delay D N corresponds to the time from time T M to time T SN .
  • Each PTP message has a clock deviation R set in addition to the GM time.
  • the clock deviation RGM is "1".
  • the PTP message from S1 to NW-TT is set with the same clock deviation R S1_GM as before.
  • Clock deviation RS1_GM is the clock deviation between GM and S1.
  • a non-conventional clock deviation R 5G_GM is set in the PTP message from NW-TT to DS-TT. Conventionally, a clock deviation RNW_GM between GM and NW-TT was set.
  • the clock deviation R NW_GM corresponds to the cumulative clock deviation ACD c (see step S135).
  • the clock deviation R 5G_GM is the clock deviation between GM and 5G-TS and corresponds to the clock deviation CD g (see step S142).
  • Clock deviation R 5G_GM is expressed as follows using clock deviation R NW_GM and clock deviation R 5G_NW .
  • the clock deviation R 5G_NW is the clock deviation between 5G-TS and NW-TT, and corresponds to the clock deviation CD f (see step S141).
  • R 5G_GM R 5G_NW R NW_GM
  • a non-conventional clock deviation R DS_GM is set in the PTP message from DS-TT to SM. Conventionally, a clock deviation RNW_GM was set.
  • the clock deviation R DS_GM is the clock deviation between GM and DS-TT and corresponds to the clock deviation CD j (see step S222).
  • the clock deviation R DS_GM is expressed as follows using clock deviation R 5G_GM and clock deviation R DS_5G .
  • the clock deviation R DS_5G is the clock deviation between 5G-TS and DS-TT, and corresponds to the clock deviation CD i (see step S221).
  • RDS_GM RDS_5G R 5G_GM
  • NW-TT and DS-TT operate as follows.
  • the NW-TT calculates a clock deviation R 5G_NW from the 5G-TS, and uses the clock deviation R NW_5G to calculate a clock deviation R 5G_GM .
  • the NW-TT then sends the clock deviation R 5G_GM to the DS-TT instead of the clock deviation R NW_GM .
  • the DS-TT calculates the clock deviation R DS_5G from the 5G-TS, and calculates the clock deviation R DS_GM using the clock deviation R DS_5G and the clock deviation R 5G_GM .
  • DS-TT then sends clock deviation R_DS_GM to SN instead of clock deviation R_NW_GM .
  • Embodiment 1 it is possible to eliminate the time error caused by a 5G network that originally does not exist in the TSN network joining the TSN network, that is, the time error caused by the clock deviation between network devices.
  • each of the network translator 210 and the device translator 220 uses the clock deviation (CD f , CD i ) with the 5G time source 111 to calculate the clock deviation between the network translator 210 and the device translator 220. Calculate indirectly. This makes it possible to eliminate the synchronization time error of the TSN slave 121 .
  • Embodiment 1 is advantageous in terms of cost because it eliminates the need to add control messages by changing existing time synchronization messages.
  • Translator 300 comprises processing circuitry 309 .
  • the processing circuit 309 is hardware that implements functional configuration elements of the network translator 210 or the device translator 220 .
  • the processing circuitry 309 may be dedicated hardware or may be a processor 311 that executes programs stored in memory.
  • processing circuitry 309 may be, for example, a single circuit, multiple circuits, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.
  • ASIC is an abbreviation for Application Specific Integrated Circuit.
  • FPGA is an abbreviation for Field Programmable Gate Array.
  • the translator 300 may include a plurality of processing circuits that substitute for the processing circuit 309.
  • processing circuit 309 some functions may be implemented by dedicated hardware, and the remaining functions may be implemented by software or firmware.
  • translator 300 can be implemented in hardware, software, firmware, or a combination thereof.
  • the "unit” that is an element of the network translator 210 or the device translator 220 may be read as “processing”, “process”, “circuit” or “circuitry”.
  • 100 time synchronization network system 101 TSN master, 102 first bridge, 110 5G network, 111 5G time source, 121 TSN slave, 122 M bridge, 210 network translator, 211 outside section communication unit, 212 delay measurement unit, 213 time Synchronization control unit 214 Clock deviation calculation unit 215 Intra-section communication unit 220 Device translator 221 In-section communication unit 222 Delay measurement unit 223 Clock deviation calculation unit 224 Out-of-section communication unit 300 Translator 301 Computer 309 Processing circuit, 310 motherboard, 311 processor, 312 serial communication device, 313 translator circuit, 320 expansion card, 321 port, 322 port.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Le traducteur de réseau (210) selon l'invention calcule un écart d'horloge entre un maître TSN (101) et une source de temps 5G (111), définit l'écart d'horloge calculé pour générer un message, et transmet le message généré à un traducteur de dispositif (220). Le traducteur de dispositif reçoit un message provenant du traducteur de réseau, calcule un écart d'horloge entre le maître TSN et le traducteur de dispositif en utilisant l'écart d'horloge entre le maître TSN et la source de temps 5G, définit l'écart d'horloge calculé pour générer un message, et transmet le message généré au côté aval d'un système de réseau de synchronisation temporelle (100).
PCT/JP2021/005744 2021-02-16 2021-02-16 Traducteur de réseau et traducteur de dispositif WO2022176026A1 (fr)

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JP2023500153A JP7258261B2 (ja) 2021-02-16 2021-02-16 ネットワークトランスレータおよびデバイストランスレータ
KR1020237026915A KR102628183B1 (ko) 2021-02-16 2021-02-16 네트워크 트랜슬레이터 및 디바이스 트랜슬레이터
TW110118981A TW202234920A (zh) 2021-02-16 2021-05-26 網路轉換器及設備轉換器

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US20220216932A1 (en) 2019-05-02 2022-07-07 Telefonaktiebolaget Lm Ericsson (Publ) 5g system signaling methods to convey tsn synchronization information

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ANONYMOUS: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; System architecture for the 5G System (5GS); Stage 2 (Release 16)", 3GPP TS 23.501 V16.4.0, 27 March 2020 (2020-03-27), XP055966194, [retrieved on 20220929] *

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