WO2013097096A1 - Procédé, dispositif et système pour fournir un temps d'écart de synchronisation - Google Patents

Procédé, dispositif et système pour fournir un temps d'écart de synchronisation Download PDF

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Publication number
WO2013097096A1
WO2013097096A1 PCT/CN2011/084758 CN2011084758W WO2013097096A1 WO 2013097096 A1 WO2013097096 A1 WO 2013097096A1 CN 2011084758 W CN2011084758 W CN 2011084758W WO 2013097096 A1 WO2013097096 A1 WO 2013097096A1
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WO
WIPO (PCT)
Prior art keywords
time
uplink symbol
peer device
symbol
convergence point
Prior art date
Application number
PCT/CN2011/084758
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English (en)
Chinese (zh)
Inventor
石操
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/084758 priority Critical patent/WO2013097096A1/fr
Priority to CN2012101042799A priority patent/CN102664698A/zh
Publication of WO2013097096A1 publication Critical patent/WO2013097096A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a method, device and system for providing synchronization deviation time.
  • DSM dynamic spectrum management
  • the existing method for implementing symbol synchronization is to measure the delay amount of the uplink symbol by the central office side, and update the advance time of the uplink symbol sent by the user side according to the advance time and the delay amount, and send the updated advance time to the user side;
  • the side sends an uplink symbol according to the received advance time after the update.
  • This method requires multiple interactions between the central office side and the user side to enable the central office side and the user side to simultaneously transmit symbols, but the simultaneous arrival of all user uplink symbols cannot be achieved, and the performance of crosstalk cancellation is not good.
  • the embodiment of the invention provides a method, a device and a system for providing a synchronization deviation time, which provides a deviation time for the peer device, and is used for adjusting the transmission time of the uplink symbol.
  • a method of providing synchronization deviation time including:
  • the aggregation point device receives the uplink symbol sent by the peer device, and obtains the start position X of the uplink symbol in the time domain;
  • the convergence point device calculates the deviation time between the X and the preset time domain position Z, A, Z is the end position of the last downlink symbol transmitted in the downlink period after the end position in the time domain and before the end position of the uplink period And generating identification information, where the identification information is used to identify whether X is located before or after Z; the convergence point device sends ⁇ t and identification information to the peer device.
  • a convergence point device comprising:
  • a receiving unit configured to receive an uplink symbol sent by the peer device, and obtain an uplink symbol in a time domain.
  • a calculating unit configured to calculate a deviation time A t between the X and the preset time domain position Z, where the last downlink symbol sent in the downlink time period is after the end position in the time domain and ends in the uplink time period Before the location;
  • An identifier generating unit configured to generate identifier information, where the identifier information is used to identify whether X is located before or after Z;
  • the sending unit is configured to send the At and the identification information to the peer device.
  • a peer device including:
  • a receiving unit configured to obtain a deviation time A t and a first identification information sent by the convergence point device, where A t is a starting position X of the uplink symbol sent by the peer device acquired by the convergence point device in the time domain and a preset time Deviation time between domain locations Z; Z is the last downlink symbol transmitted in the downlink time period after the end position in the time domain and before the end of the uplink time period;
  • the identification information is used to identify whether X is before or after Z;
  • the first identifier information is used to indicate that A t is a delay time for the peer device to send the next uplink symbol, and the adjusting unit is configured to delay the transmission time of the next uplink symbol to adjust the next uplink symbol according to the At and the first identifier information.
  • a time division duplex system comprising: a convergence point device as above and a peer device as above.
  • the advantages of the embodiment of the present invention are: providing a bias time for the peer device, and adjusting the sending time of the uplink symbol; after adjusting the sending time of the uplink symbol, each peer device enables the uplink symbol to be synchronized in the preset time domain position. Transmit, which is good for crosstalk cancellation and reduces the impact of far-end crosstalk.
  • FIG. 1 is a schematic flow chart of a method for providing synchronization deviation time according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic flowchart of a method for providing synchronization deviation time according to Embodiment 2 of the present invention
  • FIG. 3 is a convergence point of Embodiment 3 of the present invention
  • Schematic diagram of logical structure of equipment
  • FIG. 4 is a schematic diagram of a logical structure of a peer device according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic structural view of a time division duplex system according to Embodiment 5 of the present invention.
  • Figure 6 is a schematic diagram of symbol transmission in a time division duplex system of the present invention. detailed description
  • a method for providing synchronization deviation time can be applied to a time division duplex system, including:
  • the convergence point device receives the uplink symbol sent by the peer device, and obtains a starting position X of the uplink symbol in the time domain.
  • the peer device is a client device and may be an xDSL transceiver.
  • the X may be calculated by a method related to the reference signal according to the received uplink symbol. Specifically:
  • Rw S )S. ⁇
  • ⁇ is the length of the received symbol
  • ° ⁇ is the relevant time position variable. Therefore, in the specific calculation, the received uplink symbol is the received symbol, and the length of the received uplink symbol is the length of the received symbol.
  • the uplink symbol is an Orthogonal Frequency Division Multiplexing (OFDM) symbol.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the convergence point device calculates a deviation time A t between the X and a preset time domain position Z, where the Z is the end position of the last downlink symbol sent in the downlink time period in the time domain. And before the end of the uplink time period; and generating identification information, the identifier information is used to identify whether the X is before or after the Z.
  • the At is the difference between the X and the time domain position of the Z.
  • the Z is preset to enable the peer device to adjust the starting position of the next uplink symbol to be transmitted in the time domain to the time domain position of the Z.
  • the convergence point device sends the ⁇ t and the identifier information to the peer device.
  • the convergence point device provides the peer device with a delay or advance time for adjusting the uplink symbol. If multiple peer devices send uplink symbols at the adjusted transmission time, the peer device will The time domain location of the Z enables synchronous transmission of uplink symbols.
  • a method for providing synchronization deviation time includes:
  • the convergence point device receives the uplink symbol sent by the peer device, and obtains a starting position X of the uplink symbol in the time domain.
  • Step 201 is the same as step 101 in Embodiment 1, and details are not described herein again.
  • the convergence point device calculates a deviation time A t between the X and a preset time domain position Z, where the Z is the end position of the last downlink symbol sent in the downlink time period in the time domain. And before the end of the uplink time period; and generating identification information, the identifier information is used to identify whether the X is before or after the Z.
  • the generating the identification information further includes:
  • the identifier information further indicates that the ⁇ t is a delay time for the peer device to send the next uplink symbol
  • the identifier information further indicates that the At is an advance time of the peer device sending the next uplink symbol
  • the identification information may be a symbol or a numerical value.
  • the convergence point device sends the At and the identifier information to the peer device.
  • the peer device After the peer device acquires the At and the identifier information, adjust, according to the At and the identifier information, a sending time of the uplink symbol.
  • the adjusting, by the peer device, the sending time of the uplink symbol according to the acquired A t and the identifier information includes:
  • the peer device delays the sending time of the next uplink symbol by the At, and sends the convergence time to the convergence.
  • the point device sends the next upstream symbol.
  • the peer device determines, according to the At and the identifier information, that the At is a delay time, delays the transmission time of the next uplink symbol by At, that is, the next uplink symbol is in the time domain.
  • the starting position is adjusted to the time domain position of the Z, and the next up symbol is transmitted at the adjusted time domain position. If the peer device adjusts the start position of the uplink symbol to the time domain position of the Z, the peer device sends the uplink symbol to the convergence point device synchronously.
  • the peer device advances the sending time of the next uplink symbol by the ⁇ t, and sends the convergence time to the convergence point after the advancement.
  • the device sends the next upstream symbol.
  • the peer device determines, according to the A t and the identifier information, that the A t is an advance time, and advances the sending time of the next uplink symbol by A t , that is, adjusts the starting position of the next uplink symbol in the time domain to The time domain location of the Z, and the next uplink symbol is transmitted at the adjusted time domain location. If the peer device adjusts the start position of the uplink symbol to the time domain position of the Z, the peer device sends the uplink symbol to the convergence point device synchronously.
  • the A t sent to the peer device is a delay time, and after the peer device acquires the A t, the transmission time of the uplink symbol is delayed by A t; After the Z, the A t sent to the peer device is an advance time, and the peer device advances the transmission time of the uplink symbol by ⁇ ⁇ after acquiring the A t. If the X overlaps with the time domain position of the ⁇ , the A t is 0.
  • the convergence point device may send the ⁇ t to the peer device by using a message.
  • the purpose of the aggregation point device to send the At is to the peer device is: the peer device adjusts the sending time of the uplink symbol according to the At, so that the starting position of the uplink symbol in the time domain is There is no deviation in Z, as shown in Case 2 in Figure 6. If the starting position of the uplink symbol sent by the multiple peer devices in the time domain does not deviate from the Z, the multiple peer devices are configured to synchronously send the uplink symbol to the convergence point device.
  • a convergence point device includes:
  • the receiving unit 301 is configured to receive an uplink symbol sent by the peer device, and obtain a starting position X of the uplink symbol in the time domain;
  • the calculating unit 302 is configured to calculate a deviation time At between the X and a preset time domain position Z, where the Z is the end position of the last downlink symbol sent in the downlink time period and Before the end of the upstream period;
  • the identifier generating unit 303 is configured to generate identifier information, where the identifier information is used to identify whether the X bit is before or after the Z;
  • the sending unit 304 is configured to send the At and the identifier information to the peer device.
  • the receiving unit 301 receives the uplink symbol sent by the peer device, obtains the starting position X of the uplink symbol in the time domain by calculation, and then the calculating unit 302 calculates the deviation between the X and the preset time domain position Z.
  • the time A t is generated by the identifier generating unit 303, and the sending unit 304 sends the At and the identifier information to the peer device to provide the peer device with a delay for adjusting the sending time of the next uplink symbol. Or advance time.
  • the identifier generating unit 303 is configured to compare the positional relationship between the X and the Z to obtain the positional relationship between the X and the Z, and identify the positional relationship between the X and the Z by using the identification information.
  • the identifier generating unit 303 is configured to calculate a difference between the X and the time domain position of the Z. If it is less than 0, the X is located before the Z; otherwise, the X is located after the Z. .
  • the receiving unit 301 receives the uplink symbol sent by the peer device, obtains the starting position X of the uplink symbol in the time domain by calculation, and then the calculating unit 302 calculates the deviation between the X and the preset time domain position Z.
  • the time A t is further generated by the identifier generating unit 303.
  • the identifier generating unit 303 determines that the X is located before the Z, the generated identification information identifies that the X is located before the Z; if the identifier generating unit 303 determines After the X is located after the Z, the generated identification information identifies that the X is located after the Z; and the sending unit 304 sends the ⁇ t and the identification information to the peer device to provide the peer device with Adjust the delay or advance time of the transmission time of the next upstream symbol.
  • a peer device includes:
  • the receiving unit 401 is configured to obtain a deviation time A t and identifier information sent by the convergence point device, where Setting a deviation time between X and a preset time domain position Z; the Z is after the end position of the last downlink symbol transmitted in the downlink time period and before the end position of the uplink time period;
  • the identification information is used to identify whether the X is located before or after the Z;
  • the adjusting unit 402 is configured to adjust, according to the At and the identifier information, a sending time of the next uplink symbol;
  • the sending unit 403 is configured to send the next uplink symbol to the convergence point device at the adjusted sending time.
  • the receiving unit 401 obtains the deviation time A t and the identification information sent by the convergence point device, and the re-adjusting unit 402 adjusts the transmission time of the next uplink symbol according to the At and the identification information, that is, the transmission time of the next uplink symbol is delayed. Or advance ⁇ t; the sending unit 403 sends the next uplink symbol to the convergence point device at the adjusted transmission time.
  • the adjusting unit 402 is configured to delay the sending time of sending the next uplink symbol to the convergence point device by the A t; if the obtained identification information identifies that the X is located before the Z. , , mouth , , ... , preferably,
  • the adjusting unit 402 is configured to: if the acquired identification information identifies that the X is located after the Z, send a transmission time of the next uplink symbol to the convergence point device in advance of the A t;
  • the sending unit 403 is configured to send the next uplink symbol to the convergence point device at the transmission time after the advance.
  • a time division duplex system includes a convergence point device 501 and a peer device 502.
  • the convergence point device 501 is as described in Embodiment 4, and the peer device 502 is as described in Embodiment 5.
  • the convergence point device 501 obtains the start position X of the uplink symbol sent by the peer device, and calculates a difference between X and the preset time domain position Z, where the difference is the deviation time A t and generates identification information.
  • the identification information is used to identify whether the X is before or after the Z.
  • Convergence point device compares said X with said The time domain position of Z obtains the positional relationship between the X and the Z, and the positional relationship between the X and the Z is identified by the identification information. For example, the difference between the X and the time domain position of the Z is calculated. If it is less than 0, the X is located before the Z; otherwise, the X is located after the Z. Then, the convergence point device 501 transmits ⁇ t and the identification information to the opposite device 502.
  • the peer device 502 After the peer device 502 acquires the ⁇ t and the identification information, the peer device 502 adjusts the transmission time of the uplink symbol according to the ⁇ t and the identification information.
  • the peer device 502 If the identifier information acquired by the peer device 502 identifies that the X is located before the Z, according to the At and the identifier information, the peer device 502 delays the sending time of the next uplink symbol by the ⁇ . And transmitting the next uplink symbol to the convergence point device at the delayed transmission time.
  • the peer device 502 advances the sending time of the next uplink symbol by the A. And transmitting the next uplink symbol to the convergence point device 501 at the transmission time after the advance.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé adapté pour fournir un temps d'écart de synchronisation. Le procédé selon l'invention comprend les étapes suivantes, principalement : un dispositif de point de rendez-vous reçoit un symbole sur la liaison montante, qui est transmis par un dispositif sur le côté opposé, et il acquiert une position initiale X du symbole sur la liaison montante dans un domaine temporel ; le dispositif de point de rendez-vous calcule un temps d'écart Δt entre x et une position z prédéfinie dans le domaine temporel, z étant située après une position de fin du dernier symbole sur la liaison descendante qui est transmis au cours d'une période de temps sur la liaison descendante dans le domaine temporel et précédant une position de fin d'une période de temps sur la liaison montante ; le dispositif de point de rendez-vous génère des données d'identification, les données d'identification étant utilisées afin de déterminer si x se situe avant ou après z ; et le dispositif de point de rendez-vous transmet le temps d'écart Δt et les données d'identification au dispositif sur le côté opposé. La présente invention se rapporte d'autre part à un dispositif et à un système correspondants. La présente invention fournit un temps d'écart à un dispositif sur le côté opposé, de sorte à ajuster le temps de transmission d'un symbole sur la liaison montante. La présente invention est avantageuse en ce que, après que le temps de transmission d'un symbole sur la liaison montante a été ajusté pour chaque dispositif sur le côté opposé, le symbole sur la liaison montante est transmis à un dispositif de point de rendez-vous. Cela facilite ainsi la suppression d'une diaphonie et réduit également l'influence de la diaphonie sur le côté lointain.
PCT/CN2011/084758 2011-12-27 2011-12-27 Procédé, dispositif et système pour fournir un temps d'écart de synchronisation WO2013097096A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2011/084758 WO2013097096A1 (fr) 2011-12-27 2011-12-27 Procédé, dispositif et système pour fournir un temps d'écart de synchronisation
CN2012101042799A CN102664698A (zh) 2011-12-27 2012-04-11 提供同步偏差时间的方法、设备及系统

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PCT/CN2011/084758 WO2013097096A1 (fr) 2011-12-27 2011-12-27 Procédé, dispositif et système pour fournir un temps d'écart de synchronisation

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1913394A (zh) * 2005-08-09 2007-02-14 大唐移动通信设备有限公司 集群通信系统的同步控制方法
CN101854713A (zh) * 2010-03-30 2010-10-06 中国人民解放军信息工程大学 一种卫星cdma系统及其中反向链路的同步方法
WO2011011760A2 (fr) * 2009-07-23 2011-01-27 Qualcomm Incorporated Multiplexage temporel asynchrone dans les deux sens de transmission dans un réseau sans fil
WO2011143098A1 (fr) * 2010-05-10 2011-11-17 Ikanos Technology Ltd. Systèmes et procédés de transport d'informations d'heure locale dans système de communication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1913394A (zh) * 2005-08-09 2007-02-14 大唐移动通信设备有限公司 集群通信系统的同步控制方法
WO2011011760A2 (fr) * 2009-07-23 2011-01-27 Qualcomm Incorporated Multiplexage temporel asynchrone dans les deux sens de transmission dans un réseau sans fil
CN101854713A (zh) * 2010-03-30 2010-10-06 中国人民解放军信息工程大学 一种卫星cdma系统及其中反向链路的同步方法
WO2011143098A1 (fr) * 2010-05-10 2011-11-17 Ikanos Technology Ltd. Systèmes et procédés de transport d'informations d'heure locale dans système de communication

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