WO2014153726A1 - 上行导频序列同步的方法、设备及系统 - Google Patents

上行导频序列同步的方法、设备及系统 Download PDF

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Publication number
WO2014153726A1
WO2014153726A1 PCT/CN2013/073232 CN2013073232W WO2014153726A1 WO 2014153726 A1 WO2014153726 A1 WO 2014153726A1 CN 2013073232 W CN2013073232 W CN 2013073232W WO 2014153726 A1 WO2014153726 A1 WO 2014153726A1
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WIPO (PCT)
Prior art keywords
pilot sequence
uplink pilot
index value
superframe
uplink
Prior art date
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PCT/CN2013/073232
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English (en)
French (fr)
Inventor
刘义贤
何孝月
刘建华
王祥
陈仕才
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.)
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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/CN2013/073232 priority Critical patent/WO2014153726A1/zh
Priority to CN201380000239.2A priority patent/CN104254977B/zh
Publication of WO2014153726A1 publication Critical patent/WO2014153726A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for synchronizing uplink pilot sequences.
  • VDSL2 Very good-high-bit-rate Digital Subscriber Link 2 is the fastest xDSL (X Digital Subscriber Link) technology.
  • VDSL2 can provide up to downlink symmetry rate of up to 100Mbps, but it will be affected by Far End Cross-Talk (FEXT) and high frequency attenuation of the signal.
  • FEXT Far End Cross-Talk
  • the industry has proposed the Vectorin vectorization technology, which mainly utilizes the possibility of joint transmission and reception on the DSLAM (Digital Subscriber Line Access Multiplexer), and uses signal processing to offset the interference of FEXT. Finally, the FEXT interference in each signal is eliminated.
  • the upstream crosstalk canceler and downstream vector precoder used by Vectoring are unknown and need to be estimated by methods.
  • VCE Vectoring Control Entity
  • all VTU-Rs VDSL2 Transceiver Unit at the remote site
  • VCE VDSL2 Transceiver Unit at the remote site
  • the specified upstream pilot sequence The time point of the uplink synchronization symbol is defined by the time point of the sync symbol offset between the uplink and downlink synchronization symbols and the time point of the downlink synchronization symbol.
  • the time point of the downlink synchronization symbol is determined by the VCE.
  • VTU-0 VTU at the onu, optical node VTU modulates 00 or 11 4-QAM on the set of subcarriers with index 10n+9 (Quarature Amplitude Modulation, Constellation Modulation). All of the above subcarriers of each symbol modulate the same bit information, 00 or 11.
  • the ZERO or ONE symbol indicates that 00 or 11 is modulated on the above subcarriers, respectively.
  • the marker pattern is a sequence of ZERO and ONE symbols used to indicate the point in time of the synchronization symbol and the bit index of the pilot sequence.
  • Figure 1 depicts a marker pattern consisting of a sequence of symbols.
  • the time point of the downlink synchronization symbol is represented by 8 consecutive ONE symbols, wherein the first ONE symbol indicates the time point at which the downlink symbol is synchronized.
  • a pattern consisting of 20 consecutive symbols indicates the bit index of the uplink pilot sequence. As shown in FIG. 1, the pattern indicates the same on the uplink.
  • the bit index of the uplink pilot sequence is modulated on the subcarriers of the step symbols.
  • the time point of the uplink synchronization symbol can be obtained by detecting the pattern of 8 consecutive ONE symbols, and the bit index of the uplink pilot sequence can be calculated by parsing the pattern of the subsequent 20 consecutive symbols.
  • the VTU-0 can accurately acquire the time point of the uplink synchronization symbol, and must modulate the 4-QAM constellation point of 00 or 11 on the set of subcarriers with the index of 1 On+9 to ensure the downlink synchronization symbol time point and the downlink synchronization symbol.
  • the offset between the time point and the uplink sync symbol time can be accurately detected by the VTU-0, greatly increasing the complexity of the modulation.
  • the present invention provides a method, device and system for synchronizing uplink pilot sequences, which can reduce the complexity in modulation.
  • the embodiment of the present invention uses the following technical solution:
  • the present invention provides a method for synchronizing uplink pilot sequences, including: sending an uplink pilot sequence to a client; and using an uplink pilot sequence
  • the index value is sent to the client in a specified domain of the dedicated operation channel SOC message, or the uplink pilot sequence index value is modulated on the labeled subcarrier in the downlink synchronization symbol and sent to the client.
  • the uplink pilot sequence is The indexing carried in the specified domain of the SOC message is sent to the client, including:
  • the uplink pilot sequence index value is determined according to the superframe indicator bit in the SOC message to be sent, and the uplink pilot sequence index value is carried in the specified domain of the to-be-sent SOC message and sent to the client.
  • the superframe indication bit is a first bit of the SOC message or a first bit of the specified domain .
  • the transmitting the uplink pilot sequence index value in the specified domain of the to-be-sent SOC message to the client includes:
  • the SOC message carrying the uplink pilot sequence index value in the specified domain is repeatedly sent;
  • the remaining time slots in the superframe are smaller than the time slots required to transmit the SOC message, then the remaining time slots transmit only idle symbols.
  • a second aspect of the present invention provides a method for synchronizing uplink pilot sequences, including: acquiring an uplink pilot sequence and a time point of a downlink synchronization symbol; and acquiring a time point of the downlink synchronization symbol includes detecting a downlink synchronization symbol Time is the time point of the downlink synchronization symbol. Determining a time point of the uplink synchronization symbol according to a system superframe structure and a time point of the downlink synchronization symbol;
  • the sending, according to the uplink pilot sequence index value, the bit value in the uplink pilot sequence at the time point of the uplink synchronization symbol includes:
  • the determining, according to the system superframe structure and the time point of the downlink synchronization symbol, determining a time point packet of the uplink synchronization symbol includes:
  • the downlink pilot sequence is obtained as an uplink pilot sequence.
  • the present invention provides a central office device, including:
  • a first sending unit configured to send an uplink pilot sequence to the client
  • a second sending unit configured to send the uplink pilot sequence index value to the client in a specified domain of the dedicated operation channel SOC message.
  • the second sending unit includes: an acquiring module, configured to acquire a superframe indication bit and a specified domain in an SOC message to be sent, and a determining module, configured to Determining, by the acquiring module, a superframe indication bit in the to-be-sent SOC message, and determining an uplink pilot sequence index value;
  • a first sending module configured to carry the uplink pilot sequence index value determined by the determining module to the client in a specified domain of the SOC message.
  • the superframe indication bit is a first bit of the SOC message or a first bit of the specified domain.
  • the second sending unit is further configured to: repeatedly send, in a same super frame, a SOC message carrying an uplink pilot sequence index value in a specified domain; When the remaining time slot in the superframe is smaller than the time slot required to transmit the SOC message, the remaining time slot transmits only idle symbols.
  • the present invention provides a client device, including:
  • an acquiring unit configured to acquire a time point of the uplink pilot sequence and the downlink synchronization symbol; where the time point of acquiring the downlink synchronization symbol includes a time when the downlink synchronization symbol is detected as a time point of the downlink synchronization symbol;
  • a determining unit configured to determine a time point of the uplink synchronization symbol according to a system superframe structure and a time point of the downlink synchronization symbol acquired by the acquiring unit;
  • a receiving unit configured to receive a SOC message sent by the central office
  • An extracting unit configured to extract a previous pilot sequence index value from a specified domain of the SOC message received by the receiving unit
  • a sending unit configured to send, according to the uplink pilot sequence index value obtained by the extracting unit, a bit value in the uplink pilot sequence at a time point of the determining unit uplink synchronization symbol.
  • the sending unit includes: a demodulation module, configured to demodulate the SOC message to obtain a first uplink pilot sequence index value;
  • An acquiring module configured to acquire a first superframe corresponding to a symbol that carries a superframe indication bit in the SOC message, and a second superframe when the SOC message is demodulated;
  • a determining module configured to determine, according to an offset value between the first superframe and the second superframe acquired by the acquiring module, and a first uplink pilot sequence index value obtained by the demodulation module, to determine a second uplink pilot Sequence index value;
  • a sending module configured to send, according to the second uplink pilot sequence index value, a bit value in the uplink pilot sequence at a time point of the uplink synchronization symbol.
  • the determining unit includes:
  • a first determining module configured to determine, according to the superframe structure of the system, a time offset between a time point of the uplink synchronization symbol and a time of the downlink synchronization symbol;
  • a second determining module configured to determine a time point of the uplink synchronization symbol according to a time point of the downlink synchronization symbol determined by the first determining module and the time offset.
  • the present invention provides a system for synchronizing uplink pilot sequences, including the central office device provided by the third aspect and the client device provided by the fourth aspect.
  • the method, device, and system for synchronizing uplink pilot sequences provided by the embodiments of the present invention only need to send the pilot sequence and the pilot sequence index value to the client, and the subsequent client can use the information according to the information and the client itself.
  • the configuration determines the time point of the uplink pilot sequence and the uplink synchronization symbol, thereby completing the transmission of the uplink pilot sequence.
  • the central office must pass The special modulation is used to inform the client of the time point of the downlink synchronization symbol, so that the time point at which the client can determine the uplink synchronization symbol does not need to notify the time point of the downlink synchronization symbol, the process is more concise, and the system complexity is reduced. Greatly save system resource overhead.
  • FIG. 1 is a schematic diagram of a marker pattern in the prior art
  • FIG. 2 is a block diagram of a system for synchronizing uplink pilot sequences
  • FIG. 3 is a flowchart of a method for synchronizing uplink pilot sequences according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for synchronizing another uplink pilot sequence according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a superframe structure in a G.fast system
  • FIG. 6 is a schematic diagram of another uplink pilot sequence according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a method for synchronizing another uplink pilot sequence according to an embodiment of the present invention
  • FIG. 8 is a flowchart of another method for synchronizing uplink pilot sequences according to an embodiment of the present invention
  • FIG. 10 is a block diagram of a configuration of a central office device according to an embodiment of the present invention
  • FIG. 11 is a block diagram of a component of a client device according to an embodiment of the present invention
  • FIG. 10 is a block diagram of a configuration of a central office device according to an embodiment of the present invention
  • FIG. 11 is a block diagram of a component of a client device according to an embodiment of the present invention
  • FIG. 12 is a block diagram of a client device according to an embodiment of the present invention
  • FIG. 13 is another client according to an embodiment of the present invention
  • FIG. 14 is a block diagram of another configuration of a client device according to an embodiment of the present invention
  • FIG. 15 is a block diagram of another configuration of a central office device according to an embodiment of the present invention. Another block diagram of the client device provided by the example;
  • FIG. 2 is a block diagram of a component of an uplink pilot sequence synchronization system, where the system includes at least a central office device, a client device, and possibly a controller, where both the controller and the client can directly perform with the central office. Communication, and the controller and the client generally cannot directly communicate with each other.
  • the controller is mainly used to generate key parameters in the uplink pilot sequence synchronization process, for example, an uplink pilot sequence, an uplink pilot sequence index value, and the like.
  • the central office equipment can be used for crosstalk cancellation, such as DSLAM.
  • the device, the client device is a common user device such as a modem, and the controller can be a controller such as a VCE.
  • the embodiment of the present invention provides a method for synchronizing uplink pilot sequences, as shown in FIG. 3, which can be implemented by a central office device, including:
  • the pilot sequence ⁇ 'J is carried on several subcarriers of the OFDM (Orthogonal Frequency Division Multiplexing) symbol, and the parameter used for channel estimation is a continuous plurality of values.
  • the specifically defined uplink here is the data transmission direction from the client to the central office.
  • the downlink characterizes the data transmission direction from the central office to the client.
  • the uplink pilot sequence index value is carried to the client in a specified domain of a special operation channel SOC (special operations channel) message.
  • SOC special operations channel
  • the pilot sequence index value is used to notify the client of the first bit value in the uplink pilot sequence that needs to be sent.
  • the central office may define a new SOC message, and thereby carry the uplink pilot sequence index value, or a SOC message defined in the prior art, and add a new field (field) to indicate The bit index value of the uplink pilot sequence, where the SOC message may be a 0-SIGNATURE message or the like.
  • An embodiment of the present invention further provides a method for synchronizing uplink pilot sequences, as shown in FIG. 4, Can be implemented by the client, including:
  • the time point of acquiring the downlink synchronization symbol includes a time when the downlink synchronization symbol is detected as a time point of the downlink synchronization symbol.
  • the uplink pilot sequence and the uplink pilot sequence index value may refer to the foregoing description.
  • the time point of the downlink synchronization symbol is used to identify the parameter of the downlink pilot sequence index value.
  • the downlink synchronization symbol is generally configured in advance by the client and the central office. When the client obtains the downlink synchronization symbol, the client can use the pre-configured downlink synchronization symbol to perform correlation calculation on the downlink signal sent by the central office. When the sex meets a certain threshold, the client will determine that the downlink synchronization symbol is detected, and thus the time point of the downlink synchronization symbol can be determined.
  • the client can directly use the uplink pilot sequence sent by the local end, or directly use the downlink pilot sequence used by the central office as the uplink pilot sequence. If the downlink pilot sequence that the UE is using is directly used as the uplink pilot sequence, the uplink pilot sequence index value may not be separately obtained, and the downlink pilot sequence may be directly transmitted by referring to the detected downlink pilot sequence.
  • uplink pilot sequence the time point of the downlink synchronization symbol, and the subsequent execution order.
  • the uplink pilot sequence the time point of the downlink synchronization symbol, and the subsequent execution order.
  • the system superframe structure is configured for the central office and the client initialization phase. In the subsequent communication process, both the central office and the client use the same frame structure to transmit data and signaling, and are configured.
  • the time difference between the time point of the downlink synchronization symbol and the time of the uplink synchronization symbol, *, is fixed.
  • the system superframe structure can use the superframe structure defined in G.fast (next generation copper wire broadband access technology) as shown in FIG.
  • the TDD Sync Frame is a synchronization frame, which includes a downlink synchronization symbol DS sync symbol and an uplink synchronization symbol US sync symbol, and the time difference between the two symbols can be determined according to the actual configuration, when the actual configuration is unchanged, Then the time difference is fixed. When the actual configuration can be changed as needed, then the time difference is also changed to other fixed values.
  • the client can determine the time point of the uplink synchronization symbol according to the fixed time offset.
  • step 202 is as shown in FIG. 6, and includes:
  • the description of the SOC message and the specified domain may refer to the related description of step 102 above.
  • an uplink pilot sequence index value sent by the central office is 010 (indicating 3), and an uplink pilot sequence is 0110000..., a client.
  • the terminal After receiving the index value, the terminal transmits the bit value of the third bit in the uplink pilot sequence, that is, 1 at the time point of the uplink synchronization symbol.
  • the method for synchronizing the uplink pilot sequence provided by the embodiment of the present invention only needs to send the pilot sequence and the pilot sequence index value to the client, and the subsequent client can complete the sending of the uplink pilot sequence according to the information. .
  • the central office must notify the client of the time point of the downlink synchronization symbol through special modulation, so that the time point at which the client can determine the uplink synchronization symbol does not need to notify the time point of the downlink synchronization symbol.
  • the process is more concise, reduces system complexity, and can greatly save system resource overhead.
  • the embodiment of the present invention further provides several other implementation manners, including: using the labeled subcarrier in the downlink synchronization symbol to the uplink pilot.
  • the sequence index value is modulated to obtain an indication message (ie, information obtained after modulation), and the indication message is sent to the client.
  • the downlink synchronization symbol generally includes a probe tones and a flag tones for respectively modulating the pilot sequence and marking the online reconfiguration synchronization switching.
  • the TDD system initialization phase uses the labeled subcarrier to modulate the uplink pilot sequence index value and send it to the client.
  • the selection of the labeled subcarriers and the number of used labeled subcarriers during modulation are not limited herein; further, when the number of labeled subcarriers is large, the uplink pilot sequence may be repeatedly modulated on different subcarriers. Index value information, increasing robustness.
  • the labeled subcarrier is the subcarrier selected for the preferred embodiment of the TDD system for modulating the uplink pilot sequence index value. If the TDD system further defines subcarriers in the idle state of the downlink synchronization symbol in the system initialization phase, these subcarriers can be applied to the embodiment of the present invention.
  • the uplink pilot sequence index value is modulated by using the labeled subcarrier, and the modulation result is transmitted to implement the uplink pilot sequence index value transmission, because the labeled subcarrier is idle during the initialization of the TDD system. Therefore, using the subcarrier to transmit the uplink pilot sequence index value does not need to additionally set a new transmission mechanism for the transmission of the uplink pilot sequence index value, which simplifies the system configuration and reduces the system implementation complexity.
  • the embodiment of the present invention further provides another implementation manner, which is only applicable to configuring the client between the central office and the client in the TDD system.
  • the central office does not need to send the uplink pilot sequence index value to the client.
  • the same pilot sequence is used between the central office and the client, thereby eliminating the transmission process of the index value of the subsequent pilot sequence, simplifying the system configuration and reducing the system implementation complexity.
  • the obtaining of the uplink pilot sequence index value is performed, and the embodiment of the present invention provides an implementation manner for the client to obtain the uplink pilot sequence index value, which includes: receiving the indication message sent by the central office. And demodulating the indication information according to the labeled subcarrier of the downlink synchronization symbol to obtain the uplink pilot sequence index value.
  • the indication message is the same as before, and the central end uses the labeled subcarrier in the downlink synchronization symbol to modulate the uplink pilot sequence index value to obtain an indication message.
  • the embodiment of the present invention further provides an implementation manner, which is only applicable to configuring the client between the central office and the client in the TDD system to directly enable
  • the client does not need to obtain the uplink pilot sequence index value, but directly uses the downlink pilot sequence of the central office. In this way, the client can obtain the current downlink transmission guide by demodulation. Since the pilot sequences of all downlink lines are synchronized, the uplink pilot sequence bit transmission of all lines is also synchronized.
  • the client device Since the vectorization group in the downstream direction and the upstream direction of the synchronization symbol in G.fast is the same The length of the pilot sequence certainly satisfies the length requirements of the uplink pilot sequence.
  • the transmission of the pilot sequence is 4QAM modulation, and all probe subnes of a DMT carry only 1 bit in the pilot sequence, and the pilot sequence is cyclically transmitted; therefore, the client device
  • the central office device no longer needs to send the pilot sequence to the client device through a message.
  • the central office sends an uplink pilot sequence to the client.
  • the central office acquires a superframe indication bit in the SOC message to be sent and a specified domain.
  • the superframe indication bit and the designated domain are pre-negotiated by the central office and the client.
  • the super-indication indicator bit may be the first bit of the SOC or the first bit of the specified domain. It can be seen from Table 1 that the specified field described herein can be No. 20.
  • the central office determines an uplink pilot sequence index value according to the superframe indication bit in the SOC message to be sent.
  • the specific implementation manner of the step 303 is that the central office determines the superframe in which the superframe indication bit is located, and then generates a corresponding uplink sequence index value corresponding to the superframe. How to generate according to the corresponding superframe The corresponding uplink sequence index value is prior art and will not be described here.
  • the initial configuration of the superframe indication bit is the first bit of the SOC message or the first bit of the specified domain No. 20
  • the superframes corresponding to the two bit bits are the same, and therefore, the uplink pilot sequence index values determined according to different superframe indicator bits are the same.
  • the uplink pilot sequence index values determined according to different superframe indicator bits are different, and the difference between the two index values is the difference of the superframe numbers corresponding to different superframe indicator bits. value.
  • the central office carries the uplink pilot sequence index value in the specified domain of the to-be-sent SOC message and sends the value to the client.
  • the client demodulates the SOC message to obtain a first uplink pilot sequence index value.
  • the client acquires a first superframe corresponding to a symbol that carries a superframe indication bit in the SOC message, and a second superframe when the SOC message is demodulated.
  • the second superframe requires the client to perform The corresponding superframe is demodulated when the specified domain information is demodulated. Since the SOC message itself has a certain length, it takes a certain time for the client to demodulate the SOC message, that is, Said that the second superframe and the first superframe are generally different.
  • the client determines, according to the offset value between the first superframe and the second superframe, and the first uplink pilot sequence index value, a second uplink pilot sequence index value.
  • the offset value between the first superframe and the second superframe may be identified by using a difference between the superframe number of the first superframe and the second superframe, for example, the first superframe is a 900 superframe.
  • the second superframe is the 904 superframe, and the offset value is 4.
  • the uplink pilot sequence index value used by the client should be another uplink guide obtained by offsetting the four index values based on the index of the uplink pilot sequence demodulated by the client in the specified domain No. 20. Frequency sequence index value.
  • the client determines a time point of the synchronization symbol according to the system superframe structure and the time point of the downlink synchronization symbol. There is no strict order requirement between the two, and one can be obtained first, or the other can be obtained at the same time, that is, step 308 can be performed before step 305, or both, and step 308 can also occur between steps 305-307. As long as the bit value in the upper and lower pilot sequences is transmitted, the uplink pilot sequence index value and the uplink synchronization coincidence time point are determined.
  • the client sends, according to the uplink pilot sequence index value, a bit value in the uplink pilot sequence at an uplink synchronization symbol time point.
  • the SOC message contains more information content, and the transmission length thereof becomes longer. In this way, the same SOC cannot be transmitted in one superframe, that is, there is a case of cross-frame.
  • the impact of the cross-frame is avoided, and the central station and the uplink pilot sequence are guaranteed. The correctness of the index value transmission.
  • a new SOC message is defined for transmitting the uplink pilot sequence index value.
  • the structure of the SOC message can be seen in Table 2 below.
  • the process includes:
  • the central office sends an uplink pilot sequence to the client.
  • the central office carries the uplink pilot sequence index value in a specified domain of the SOC message to be sent, and repeatedly sends the value to the client in the same superframe.
  • the newly defined SOC message since the newly defined SOC message is very short in length, it can be repeated in the same superframe, but in order to avoid the occurrence of cross-frames when the last transmission of the SOC message occurs when multiple repeated transmissions occur, When it is determined that the remaining time slots in the superframe are smaller than the time slots required to transmit the SOC message, then the remaining time slots transmit only idle symbols.
  • the superframe corresponding to the index value of the uplink pilot sequence indicated by the field No. 2 can be clearly defined according to a certain rule, for example, this
  • the superframe corresponding to the uplink pilot sequence index value is a pilot sequence bit value that should be sent on the Mth superframe after the client receives the message.
  • the client extracts the uplink pilot sequence index value from a specified domain of the SOC message.
  • the client determines a time point of the synchronization symbol according to a system superframe structure and a time point of the downlink synchronization symbol.
  • the client sends, according to the uplink pilot sequence index value, a bit value in the uplink pilot sequence at an uplink synchronization symbol time point.
  • each SOC message is not required to be continuously transmitted, and other messages may be sent between multiple SOC messages.
  • a new SOC message is defined, and a repeating transmission mechanism is provided to ensure that the client can determine the uplink pilot sequence index value accurately, thereby implementing synchronization of the uplink pilot sequence index value.
  • the time slots insufficient to transmit the complete SOC message are all filled with idle symbols to ensure the correctness of the uplink pilot sequence index value transmission.
  • the labeled subcarriers are used during the initialization of the TDD system for the transmission of the uplink pilot sequence index values.
  • the process includes:
  • the central office sends an uplink pilot sequence to the client.
  • the central office modulates the uplink pilot sequence index value by using a labeled subcarrier in a downlink synchronization symbol to obtain an indication message.
  • the central office sends the indication message to the client.
  • the client demodulates the indication information according to the labeled subcarrier of the downlink synchronization symbol, to obtain the uplink pilot sequence index value.
  • the client determines a time point of the uplink synchronization symbol according to a system superframe structure and a time point of the downlink synchronization symbol.
  • the client sends, according to the uplink pilot sequence index value, a bit value in the uplink pilot sequence at an uplink synchronization symbol time point.
  • the uplink pilot sequence index value is modulated by using the labeled subcarrier, and the modulation result is transmitted to implement the uplink pilot sequence index value transmission, because the labeled subcarrier is idle during the initialization of the TDD system. Therefore, using the subcarrier to transmit the uplink pilot sequence index value does not need to additionally set a new transmission mechanism for the transmission of the uplink pilot sequence index value, which simplifies the system configuration and reduces the system implementation complexity.
  • the embodiment of the invention provides a central office device, which can be used to implement the method flow of the central office side as shown in FIG. 3 to FIG.
  • the first sending unit 61 is configured to send an uplink pilot sequence to the client.
  • a second sending unit 62 configured to carry an uplink pilot sequence index value on a dedicated operation channel
  • the specified domain of the soc message is sent to the client.
  • the second sending unit 62 includes:
  • the obtaining module 621 is configured to obtain a superframe indication bit in the SOC message to be sent and a specified domain.
  • the determining module 622 is configured to determine an uplink pilot sequence index value according to the superframe indicator bit in the to-be-sent SOC message acquired by the acquiring module 621.
  • the first sending module 623 is configured to carry the uplink pilot sequence index value determined by the determining module 622 in a specified domain of the SOC message and send the message to the client.
  • the superframe indication bit is the first bit of the SOC message or the first bit of the designated domain.
  • the second sending unit 62 is further configured to repeatedly send the SOC message carrying the uplink pilot sequence index value in the specified domain in the same superframe; when determining that the remaining time slot in the superframe is smaller than When the time slot required for transmitting the SOC message is transmitted, then the remaining time slot transmits only idle symbols.
  • the second sending unit 62 is configured to modulate the uplink pilot sequence index value by using a labeled subcarrier in a downlink synchronization symbol, obtain an indication message, and send the indication message to the client. end.
  • the embodiment of the invention provides a client device, which can be used to implement the method flow of the client side as shown in FIG. 3 to FIG. 8 . As shown in Figure 12, it includes:
  • the obtaining unit 71 is configured to acquire an uplink pilot sequence, a time point of the downlink synchronization symbol, and an uplink pilot sequence index value.
  • the determining unit 72 is configured to determine a time point of the uplink synchronization symbol according to the system superframe structure and the time point of the downlink synchronization symbol acquired by the acquiring unit 71.
  • the receiving unit 73 is configured to receive the SOC message sent by the central office.
  • the extracting unit 74 is configured to extract an uplink pilot sequence index value from a specified domain of the SOC message received by the receiving unit 73.
  • the sending unit 75 is configured to send, according to the uplink pilot sequence index value obtained by the extracting unit 74, a bit value in the uplink pilot sequence at an uplink synchronization symbol time point of the determining unit 72.
  • the acquiring unit 71 is configured to use the downlink pilot sequence sent by the central office as an uplink pilot sequence.
  • the sending unit 75 includes:
  • the demodulation module 751 is configured to demodulate the SOC message to obtain a first uplink pilot sequence index value.
  • the obtaining module 752 is configured to obtain a first superframe corresponding to a symbol that carries a superframe indication bit in the SOC message, and a second superframe when the SOC message is demodulated.
  • a determining module 753 configured to acquire the first superframe and the second super according to the acquiring module 742
  • the offset value between the frames and the first uplink pilot sequence index value obtained by the demodulation module 741 determine the second uplink pilot sequence index value.
  • the sending module 754 is configured to send, according to the uplink pilot sequence index value obtained by the determining module 753, a bit value in the uplink pilot sequence at an uplink synchronization symbol time point of the determining unit 72.
  • the extracting unit 74 may be configured to receive an indication message sent by the central office, where the indication message is that the central office uses the labeled subcarrier in the downlink synchronization symbol to modulate the index value of the uplink pilot sequence, to obtain And indicating the message; demodulating the indication information according to the labeled subcarrier of the downlink synchronization symbol to obtain the uplink pilot sequence index value.
  • the determining unit 72 includes:
  • the first determining module 721 is configured to determine, according to the system superframe structure, a time offset between a time point of the uplink synchronization symbol and a time of the downlink synchronization symbol.
  • the second determining module 722 is configured to determine a time point of the uplink synchronization symbol according to a time point of the downlink synchronization symbol determined by the first determining module 721 and the time offset.
  • the device for synchronizing the uplink pilot sequence provided by the embodiment of the present invention only needs to send the pilot sequence and the pilot sequence index value to the client, and the subsequent client can complete the sending of the uplink pilot sequence according to the signals. .
  • the central office must notify the client of the time point of the downlink synchronization symbol through special modulation, so that the client can determine the uplink synchronization symbol.
  • the process is more concise, the system complexity is reduced, and the system resource overhead can be greatly saved.
  • the embodiment of the present invention further provides a central office device, as shown in FIG. 15, including: a processor 81, a memory 82, and an input/output interface 83, wherein the memory 82 is configured with a code, and the processor 81 is configured by the processor 81.
  • the code stored in the memory 82 is called to implement the aforementioned method flow on the central office side as shown in FIGS. 2 to 7.
  • the input/output interface 83 is configured to communicate with the outside of the system, transmit an externally sent message to the processor, and send the message sent by the processor indication. All three units above can communicate via the bus.
  • the input/output interface 83 is configured to send an uplink pilot sequence to the client, and send the uplink pilot sequence index value to the client in a specified domain of the dedicated operation channel SOC message.
  • the memory 82 is configured to store an uplink pilot sequence and an uplink pilot sequence index value.
  • the processor 81 is configured to obtain a superframe indication bit and a designated domain in the SOC message to be sent, and determine an uplink pilot sequence index value according to the superframe indication bit in the SOC message to be sent.
  • the input/output interface 83 is configured to send the uplink pilot sequence index value to the client in the specified domain of the to-be-sent SOC message.
  • the superframe indication bit is the first bit of the SOC message or the first bit of the designated domain.
  • the input/output interface 83 is configured to carry an uplink in a specified domain in the same superframe.
  • the SOC message of the pilot sequence index value is repeatedly transmitted; when it is determined that the remaining time slot in the superframe is smaller than the time slot required to transmit the SOC message, then the remaining time slot transmits only idle symbols.
  • the processor 81 is further configured to modulate the uplink pilot sequence index value by using a labeled subcarrier in a downlink synchronization symbol to obtain an indication message.
  • the input/output interface 83 is configured to send the indication message to the client.
  • the embodiment of the present invention further provides a central office device, as shown in FIG. 16, including: a processor 91, a memory 92, and an input/output interface 93, wherein the memory 92 is configured with a code, and the processor 91 is configured by the processor 91.
  • the code stored in the memory 92 is called to implement the aforementioned method flow on the central office side as shown in FIGS. 2 to 7.
  • the input/output interface 93 is configured to communicate with the outside of the system, transmit an externally sent message to the processor, and send the message sent by the processor indication. All three units above can communicate via the bus.
  • the processor 91 is configured to acquire an uplink pilot sequence and a time point of the downlink synchronization symbol.
  • the time point of the uplink synchronization symbol is determined according to the system superframe structure and the time point of the downlink synchronization symbol, and the SOC message sent by the central office is received. And extracting, from the specified domain of the SOC message, an uplink pilot sequence index value; and transmitting, according to the uplink pilot sequence index value, a bit value in the uplink pilot sequence at a time point of the uplink synchronization symbol.
  • the input/output interface 93 is configured to send, according to the uplink pilot sequence index value, a bit value in the uplink pilot sequence at a time point of the uplink synchronization symbol.
  • the memory 92 is configured to store an uplink pilot sequence and a time point of a downlink synchronization symbol. And the uplink pilot sequence index value. Uplink pilot sequence.
  • the processor 91 is configured to: demodulate the SOC message to obtain a first uplink pilot sequence index value; and obtain a first superframe corresponding to a symbol that carries a superframe indicator bit in the SOC message. And completing a second superframe when demodulating the SOC message; determining, according to the offset value between the first superframe and the second superframe, and the first uplink pilot sequence index value, determining a second uplink Frequency sequence index value.
  • the processor 91 is configured to receive an indication message sent by the central office, where the indication message is that the central office uses the labeled subcarrier in the downlink synchronization symbol to modulate the index value of the uplink pilot sequence, to obtain Determining the indication information according to the labeled subcarrier of the downlink synchronization symbol, to obtain the uplink pilot sequence index value; and according to the second uplink pilot sequence index value, at the uplink synchronization symbol time point And transmitting a bit value in the uplink pilot sequence.
  • the processor 91 is configured to determine, according to the system superframe structure, a time offset between a time point of the uplink synchronization symbol and a time of the downlink synchronization symbol, Determining a time point of the downlink synchronization symbol and the time offset, determining a time point of the uplink synchronization symbol.
  • the device for synchronizing the uplink pilot sequence provided by the embodiment of the present invention only requires the central office to serve the client.
  • the UE sends the pilot sequence and the pilot sequence index value, and the subsequent client can complete the uplink pilot sequence transmission according to the signals.
  • the central office must notify the client of the time point of the downlink synchronization symbol through special modulation, so that the time point at which the client can determine the uplink synchronization symbol does not need to notify the time point of the downlink synchronization symbol.
  • the process is more concise, reduces system complexity, and can greatly save system resource overhead.
  • the central office device 1001 is connected to the client device 1002, and the central office device 1001 is connected to the client device 1002.
  • the central office device 1001 is a central office device defined by any one of the foregoing embodiments.
  • the client device 1002 A client device defined by any of the above various embodiments.
  • the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. .
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a hard disk or optical disk or the like includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

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Abstract

本发明公开了一种上行导频序列同步的方法及设备,涉及通信技术领域,仅要求局端向客户端发送导频序列以及通过SOC消息发送导频序列索引值即可,后续客户端可以根据这些信息,以及自身配置来确定上行导频序列以及上行同步符号的时间点,进而完成上行导频序列的发送。

Description

上行导频序列同步的方法、 设备及系统 技术领域
本发明涉及通信技术领域, 尤其涉及一种上行导频序列同步的方法、 设备及系统。
背景技术
VDSL2 ( Very-high-bit-rate Digital Subscriber Link 2 , 第二代甚高速数 字用户线路 ) 是目前速度最快的 xDSL ( X Digital Subscriber Link, 各类 数字用户线路)技术。 理论上 VDSL2能提供最大 100Mbps的上下行对称 速率, 但会受到远端串扰( Far End Cross-Talk, FEXT )和信号高频衰减的 影响。 目前业界提出了 Vectorin 矢量化)技术,主要利用在 DSLAM( Digital Subscriber Line Access Multiplexer, 数字用户线路接入复用器) 端进行联 合的收发的可能性, 使用信号处理的方法来抵消 FEXT的干扰。 最终消除 每一路信号中 FEXT干扰。 在实际系统中, Vectoring 所使用的上行串音抵消器和下行矢量预编 码器是未知的, 需要通过方法将他们估计出来。 当前业界一般使用在同步 符号 ( sync symbol ) 上发送导频序歹' J ( pilot sequence ), 并由接收端向矢 量化控制实体 ( Vectoring Control Entity, VCE ) 反馈误差来计算上行串音 抵消器和下行矢量预编码器。 在 VDSL2 中, 下行方向矢量化组的所有 VTU-0应同时发送下行同 步符号。 同时, VTU-0在下行同步符号的所有探测子载波 (probe tones ) 上调制 VCE指定的下行导频序列。上行方向上,初始化阶段中所有 VTU-R ( VDSL2 Transceiver Unit at the remote site , 远端 VDSL2收发器单元)应 在 VCE指定的时间点发送上行同步符号, 且在同步符号的所有子载波上 调制 VCE指定的上行导频序列。 上行同步符号的时间点是通过上行和下 行同步符号之间的时间点偏移量 ( sync symbol offset ) 以及下行同步符号 的时间点共同定义的。 其中, 下行同步符号的时间点由 VCE决定。
为了指示下行同步符号的时间点和上行导频序列的比特索引, VTU-0 ( VTU at the onu, 光节点端 VTU ) 在索引为 10n+9的子载波集合上调制 00或 11的 4-QAM ( Quadrature Amplitude Modulation, 正交幅度调制 ) 星座点。每个符号的所有上述子载波都调制相同的比特信息, 即 00或 11。 ZERO或 ONE符号分别表示在上述的子载波上调制 00或 11。标记图样是 一个由 ZERO和 ONE符号组成的序列, 用于指示同步符号的时间点和导 频序列的比特索引。
图 1描述了一个由符号序列组成的标记图样。下行同步符号的时间点 由 8个连续的 ONE符号表示,其中第一个 ONE符号指示了下行符号同步 的时间点。 在 8个连续 ONE符号的图样之后, 由 20个连续符号组成的图 样来指示上行导频序列的比特索引, 如图 1所示, 该图样指示了在上行同 步符号的子载波上调制上行导频序列的比特索引。 上行同步符号的时间点可通过检测 8个连续 ONE符号的图样进行推 算得到, 上行导频序列的比特索引可通过解析随后 20个连续符号的图样 来计算得到。 发明人在实现上述技术的过程中, 发现至少如下问题: 为了保证
VTU-0能够准确地获取到上行同步符号的时间点,必须要在索引为 1 On+9 的子载波集合上调制 00或 11的 4-QAM星座点以保证下行同步符号时间 点以及下行同步符号时间点与上行同步符号时间之间的偏移量能够准确 地被 VTU-0检测出来, 极大地增加了调制时的复杂度。
发明内容
本发明提供一种上行导频序列同步的方法、设备及系统, 可以降低调 制时的复杂度。 为达到上述目的, 本发明的实施例釆用如下技术方案: 第一方面, 本发明提供了一种上行导频序列同步的方法, 包括: 向客户端发送上行导频序列; 将上行导频序列索引值携带在专用操作信道 SOC消息的指定域中发 送至所述客户端,或者将上行导频序列索引值调制在下行同步符号中的标 记子载波上发送至所述客户端。 结合第一方面, 在第一种可能的实现方式中, 所述将上行导频序列索 引值携带在 SOC消息的指定域中发送至所述客户端包括:
获取待发送 SOC消息中的超帧指示位以及指定域;
根据待发送 SOC消息中的超帧指示位, 确定上行导频序列索引值; 将所述上行导频序列索引值携带在所述待发送 SOC消息的所述指定 域中发送至所述客户端。
结合第一方面的第一种可能的实现方式, 在第二种可能的实现方式 中,所述超帧指示位为所述 SOC消息的第一个 bit或者为所述指定域的第 一个 bit。
结合第一方面, 在第三种可能的实现方式中, 所述将上行导频序列索 引值携带在所述待发送 SOC 消息的所述指定域中发送至所述客户端包 括:
在同一超帧内, 将在指定域携带有上行导频序列索引值的 SOC消息 重复发送;
当确定所述超帧内剩余时隙小于传输所述 SOC消息所需的时隙时, 则所述剩余时隙仅传输空闲符号。
第二方面, 本发明提供了一种上行导频序列同步的方法, 包括: 获取上行导频序列以及下行同步符号的时间点;所述获取下行同步符 号的时间点包括将检测到下行同步符号的时间作为下行同步符号的时间 点. 根据系统超帧结构以及所述下行同步符号的时间点,确定上行同步符 号的时间点;
接收局端发送的 SOC消息, 并从所述 SOC消息的指定域中提取上行 导频序列索引值或者接收调制有上行导频序列索引值的下行同步符号中 的标记子载波, 从所述标记子载波中解调出上行导频序列索引值;
根据所述上行导频序列索引值, 在所述上行同步符号时间点, 发送所 述上行导频序列中的比特值。
结合第二方面, 在第一种可能的实现方式中, 所述根据所述上行导频 序列索引值, 在所述上行同步符号时间点, 发送所述上行导频序列中的比 特值包括:
解调所述 SOC消息获取到第一上行导频序列索引值;
获取承载所述 SOC消息中的超帧指示位的符号对应的第一超帧以及 完成解调所述 SOC消息时的第二超帧;
根据所述第一超帧与第二超帧之间的偏移值以及所述第一上行导频 序列索引值, 确定第二上行导频序列索引值;
根据所述第二上行导频序列索引值, 在所述上行同步符号时间点, 发 送所述上行导频序列中的比特值。
结合第二方面或第二方面的第一种可能的实现方式,所述根据系统超 帧结构以及所述下行同步符号的时间点, 确定上行同步符号的时间点包 括:
根据所述系统超帧结构,确定所述上行同步符号的时间点与所述下行 同步符号的时间点之间的时间偏移量;
根据所述下行同步符号的时间点以及所述时间偏移量,确定所述上行 同步符号的时间点。
结合第二方面或第二方面的第一种可能的实现方式,获取下行导频序 列作为上行导频序列。
第三方面, 本发明提供了一种局端设备, 包括:
第一发送单元, 用于向客户端发送上行导频序列;
第二发送单元 ,用于将上行导频序列索引值携带在专用操作信道 SOC 消息的指定域中发送至所述客户端。
结合第三方面,在第一种可能的实现方式中,所述第二发送单元包括: 获取模块, 用于获取待发送 SOC消息中的超帧指示位以及指定域; 确定模块, 用于根据所述获取模块获取的待发送 SOC消息中的超帧 指示位, 确定上行导频序列索引值;
第一发送模块,用于将所述确定模块确定的上行导频序列索引值携带 在 SOC消息的指定域中发送至所述客户端。
结合第三方面的第一种可能的实现方式, 在第二种可能的实现方式 中, 所述超帧指示位为所述 SOC消息的第一个 bit或者为所述指定域的第 一个 bit。
结合第三方面, 在第三种可能的实现方式中, 所述第二发送单元还用 于在同一超帧内, 将在指定域携带有上行导频序列索引值的 S0C消息重 复发送; 当确定所述超帧内剩余时隙小于传输所述 SOC消息所需的时隙 时, 则所述剩余时隙仅传输空闲符号。
第四方面, 本发明提供了一种客户端设备, 包括:
获取单元, 用于获取上行导频序列以及下行同步符号的时间点; 所述 获取下行同步符号的时间点包括将检测到下行同步符号的时间作为下行 同步符号的时间点;
确定单元,用于根据系统超帧结构以及所述获取单元获取到的所述下 行同步符号的时间点, 确定上行同步符号的时间点;
接收单元, 用于接收局端发送的 SOC消息;
提取单元, 用于从所述接收单元接收的 SOC消息的指定域中提取上 行导频序列索引值;
发送单元, 用于根据所述提取单元得到的上行导频序列索引值, 在所 述确定单元上行同步符号时间点, 发送所述上行导频序列中的比特值。
结合第四方面, 在第一种可能的实现方式中, 所述发送单元包括: 解调模块,用于解调所述 SOC消息获取到第一上行导频序列索引值; 获取模块, 用于获取承载所述 SOC消息中的超帧指示位的符号对应 的第一超帧以及完成解调所述 SOC消息时的第二超帧;
确定模块,用于根据所述获取模块获取的第一超帧与第二超帧之间的 偏移值以及所述解调模块得到的第一上行导频序列索引值,确定第二上行 导频序列索引值;
发送模块, 用于根据所述第二上行导频序列索引值, 在所述上行同步 符号时间点, 发送所述上行导频序列中的比特值。
结合第四方面或第四方面的第一种可能的实现方式,所述确定单元包 括:
第一确定模块, 用于根据所述系统超帧结构, 确定所述上行同步符号 的时间点与所述下行同步符号的时间 , 之间的时间偏移量;
第二确定模块,用于根据所述第一确定模块确定的下行同步符号的时 间点以及所述时间偏移量, 确定所述上行同步符号的时间点。
第五方面, 本发明提供了一种上行导频序列同步的系统, 包括上述第 三面提供的局端设备和第四方面提供的客户端设备。
本发明实施例提供的一种上行导频序列同步的方法、设备及系统, 仅 要求局端向客户端发送导频序列和导频序列索引值即可,后续客户端可以 根据这些信息,以及自身配置来确定上行导频序列以及上行同步符号的时 间点, 进而完成上行导频序列的发送。 相比于现有技术中局端必须要通过 特殊调制来告知客户端下行同步符号的时间点,以便客户端能够确定上行 同步符号的时间点来说, 不需要通知下行同步符号的时间点, 该流程更为 简洁, 降低了系统复杂度, 可以极大地节约系统资源开销。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对 实施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员 来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附 图。 图 1为现有技术中一种标记图样的示意图; 图 2为一种上行导频序列同步的系统的组成框图; 图 3为本发明实施例提供一种上行导频序列同步的方法流程图; 图 4为本发明实施例提供另一种上行导频序列同步的方法流程图; 图 5为 G.fast系统中的超帧结构示意图; 图 6为本发明实施例提供另一种上行导频序列同步的方法流程图; 图 7为本发明实施例提供另一种上行导频序列同步的方法流程图; 图 8为本发明实施例提供另一种上行导频序列同步的方法流程图; 图 9为本发明实施例提供另一种上行导频序列同步的方法流程图; 图 10为本发明实施例提供的一种局端设备的组成框图; 图 11为本发明实施例提供的另一种局端设备的组成框图; 图 12为本发明实施例提供的一种客户端设备的组成框图; 图 13为本发明实施例提供的另一种客户端设备的组成框图; 图 14为本发明实施例提供的另一种客户端设备的组成框图; 图 15为本发明实施例提供的另一种局端设备的组成框图; 图 16为本发明实施例提供的另一种客户端设备的组成框图;
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进 行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没 有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的 范围。 图 2示出了一种上行导频序列同步系统的组成框图,该系统至少包括 局端设备、 客户端设备, 还有可能包括控制器, 其中, 控制器和客户端均 可以与局端直接进行通信, 而控制器和客户端之间一般不能直接进行通 信, 若需要通信, 则需要局端进行转发等处理。 其中, 控制器主要用于生 成上行导频序列同步过程中的关键参数, 例如, 上行导频序列, 上行导频 序列索引值等。 在该系统中, 局端设备可以为 DSLAM等用于串音消除的 设备, 客户端设备为调制解调器等常见的用户设备, 控制器可以为 VCE 等控制器。
基于如图 2所示的上行导频序列同步系统,本发明实施例提供了一种 上行导频序列同步的方法, 如图 3所示, 可由局端设备实现, 包括:
101、 向客户端发送上行导频序列。
其中, 导频序歹' J承载在 OFDM ( Orthogonal Frequency Division Multiplexing) , 正交频分复用 ) 符号的几个子载波上, 用于进行信道估计 的参数, 是连续的多个数值。 而此处特别限定的上行表征的是从客户端到 局端的数据传输方向, 相对的, 下行表征的是从局端到客户端的数据传输 方向。
102、 将上行导频序列索引值携带在专用操作信道 SOC ( special operations channel ) 消息的指定域中发送至所述客户端。
其中,所述导频序列索引值用于通知客户端需要发送的上行导频序列 中的第几个比特值。
在本实施例中, 局端可以定义新的 SOC消息, 并以此来承载上行导 频序列索引值, 或者在现有技术中已定义的 SOC消息, 里面增加一个新 的域 (field ) 来指示上行导频序列的比特索引值, 此处的 SOC 消息可以 为 0-SIGNATURE消息等。
本发明实施例还提供了一种上行导频序列同步的方法, 如图 4所示, 可由客户端实现, 包括:
201、 获取上行导频序列以及下行同步符号的时间点;所述获取下行同 步符号的时间点包括将检测到下行同步符号的时间作为下行同步符号的 时间点。
其中, 上行导频序列和上行导频序列索引值可参照前述描述。 而下行 同步符号的时间点用于标识下行导频序列索引值的参数。下行同步符号一 般由客户端和局端事先进行统一配置,客户端在获取下行同步符号的时间 点可以使用预先配置好的下行同步符号对局端发送的下行信号进行相关 计算, 当计算得到的相关性符合一定阔值范围时, 则客户端会认定检测到 了下行同步符号, 由此即可确定下行同步符号的时间点。
在此值得说明的是, 客户端在获取上行导频序列时, 可以直接使用局 端发送过来的上行导频序列,或者将局端正在使用的下行导频序列直接作 为上行导频序列使用。若客户端将局端正在使用的下行导频序列直接作为 上行导频序列使用, 则可不需要另行获取上行导频序列索引值, 直接参照 检测到的下行导频序列发送即可。
进一步值得说明的是, 上行导频序列、 下行同步符号的时间点以及后 的执行顺序。 在本发明实施例仅要求获取到以上三个参数即可。
202、 根据系统超帧结构以及所述下行同步符号的时间点, 确定上行 同步符号的时间点。
其中, 所述系统超帧结构为局端和客户端初始化阶段配置好的, 在后 续通信过程中, 局端和客户端均使用该相同的帧结构来传输数据和信令, 并且, 在配置好的超帧结构中, 下行同步符号的时间点和上行同步符号的 时间 , *、的时间差是固定的。
优选的, 系统超帧结构可使用如图 5所示的 G.fast (下一代铜线宽带 接入技术) 内定义的超帧结构。 其中, TDD Sync Frame即为同步帧, 其 中包括了下行同步符号 DS sync symbol和上行同步符号 US sync symbol , 而这两个符号之间的时间差是可根据实际配置确定, 当实际配置不变时, 则该时间差就是固定的。 当实际配置可根据需要来进行改变, 则此时该时 间差也相应改变为其它固定值。
基于此, 客户端在检测到下行同步符号的时间点之后, 就可以根据固 定的时间偏移量来确定上行同步符号的时间点。
因此, 步骤 202的具体实现方式如图 6所示, 包括:
2021、根据所述系统超帧结构, 确定所述上行同步符号的时间点与所 述下行同步符号的时间点之间的时间偏移量。
2022、根据所述下行同步符号的时间点以及所述时间偏移量, 确定所 述上行同步符号的时间 ,、。
203、 接收局端发送的 SOC消息, 并从所述 SOC消息的指定域中提 取上行导频序列索引值。
其中, 所述 SOC消息以及所述指定域的描述可参照上述步骤 102的 相关描述。
204、 根据所述上行导频序列索引值, 在所述上行同步符号时间点, 例如局端发送的上行导频序列索引值为 010 (表示 3 ), 上行导频序列为 0110000... ,客户端接收到该索引值后, 在上行同步符号时间点, 发送上行 导频序列中的第 3位的比特值, 即 1。
本发明实施例提供的一种上行导频序列同步的方法,仅要求局端向客 户端发送导频序列和导频序列索引值即可, 后续客户端可以根据这些信 完成上行导频序列的发送。相比于现有技术中局端必须要通过特殊调制来 告知客户端下行同步符号的时间点,以便客户端能够确定上行同步符号的 时间点来说, 不需要通知下行同步符号的时间点, 该流程更为简洁, 降低 了系统复杂度, 可以极大地节约系统资源开销。
进一步的, 除了使用上述步骤 102来实现上行导频序列索引值外, 本 发明实施例在此还提供几另一种实现方式, 包括: 使用下行同步符号中的 标记子载波对所述上行导频序列索引值进行调制, 得到指示消息(即调制 后得到的信息), 并将所述指示消息发送至所述客户端。 值得说明的是, 在下行同步符号中一般包括有探测子载波 (probe tones ) 和标记子载波 (flag tones ), 分别用于调制导频序列和标记在线重 配置同步切换。 在此, 本实施方式中, TDD 系统初始化阶段使用该标记 子载波来对上行导频序列索引值进行调制, 并发送至客户端。
在本实现方式中,在调制时对标记子载波的选择以及使用标记子载波 数量在此不进行限制;进一步地, 当标记子载波数量较多时, 可以在不同 子载波上重复调制上行导频序列索引值信息, 增加鲁棒性。
进一步值得说明的是, 该标记子载波为本发明实施例应用于 TDD系 统中的优选实施方式所选择的用于调制上行导频序列索引值的子载波。若 TDD 系统中还定义有在系统初始化阶段, 下行同步符号中处于空闲状态 的子载波, 则这些子载波均可以应用于本发明实施例中。
上述实现方式中,通过使用标记子载波来对上行导频序列索引值进行 调制, 并传输调制结果来实现上行导频序列索引值的传输, 由于标记子载 波在 TDD系统初始化的过程中是空闲的, 因此, 使用该子载波来传输上 行导频序列索引值,同样不需要为上行导频序列索引值的传输额外设置新 的传输机制, 简化了系统构成, 降低了系统实现复杂度。
另外, 除上述两种实现方式外, 本发明实施例在此还提供了另一种实 现方式, 仅应用于在 TDD系统中局端和客户端之间配置为客户端可直接 中, 局端不需要向客户端发送上行导频序列索引值
在此实现方式, 通过局端和客户端之间使用相同的导频序列, 从而省 略了后续导频序列索引值的传输过程, 简化了系统构成, 降低了系统实现 复杂度
相应的, 除步骤 203可实现获取上行导频序列索引值外, 本发明实施 例在此为客户端获取上行导频序列索引值还提供了一种实现方式, 包括: 接收局端发送的指示消息;根据下行同步符号的标记子载波对所述指 示信息进行解调, 得到所述上行导频序列索引值。 其中, 所述指示消息同 前所述,为局端使用下行同步符号中的标记子载波对所述上行导频序列索 引值进行调制, 得到指示消息
另外, 除上述两种实现方式外, 本发明实施例在此还提供了一种实现 方式, 仅应用于在 TDD系统中局端和客户端之间配置为客户端可直接使
, 此时在该实现方式 中, 客户端不需要获取上行导频序列索引值, 而是直接使用局端的下行导 频序列即可。 釆用这种方式, 客户端可以通过解调得到当前下行发送的导 由于下行所有线路的导频 序列是同步的, 所以所有线路的上行导频序列比特发送也是同步的
由于在 G.fast 中的同步符号的下行方向和上行方向的矢量化组是同 导频序列的长度肯定满足上行导频序列的长度要求。 另外, 导频序列的发 送是釆用 4QAM调制, 一个 DMT的所有探测子载波 (probe tones ) 只承 载导频序列中的 1个比特, 且导频序列是循环发送的; 因此, 客户端设备
案, 不再需要局端设备通过消息将导频序列发送给客户端设备。
几个优选实施方式, 用以详细描述上述流程。 在如图 7 所示的流程中, 为传输上行导频序列索引值在原有的 SOC 消息中定义了新的指定域 No.20 , 该 SOC消息结构可参见下表 1。
SOC消息格式 1
域 域名 格式
1 消息描述符 Message code
2 下行方向支持的子载波集
3 上行方向支持的子载波集 Bands descriptor
4 发送下行 PSD
5 发送上行 PSD PSD descriptor
6 信道发现阶段使用的下行
PSD
7 初始下行 PSD最大值 2 bytes
8 下行最大名义总发送功率 2 bytes
9 UPBO参考 PSD参数 UPBOPSD descriptor
10 最大目标速率 2 bytes 11 下行最大 SNR余量 2 bytes
12 下行目标 SNR余量 2 bytes
13 下行发送窗口长度 1 byte
14 下行循环前缀长度 2 bytes
15 TA的初始值 2 bytes
16 下行发送参考虚拟噪声 PSD descriptor
17 SNR Margin的模式 1 byte
18 上行发送参考虚拟噪声 PSD descriptor
19 UPBO参考电气长度 UPBOREFEL descriptor
20 上行导频序列索引值 2 bytes 包括:
301、 局端向客户端发送上行导频序列。
302、 局端获取待发送 SOC消息中的超帧指示位以及指定域。 其中, 所述超帧指示位及指定域均为局端和客户端预先协商好的, 例 如超桢指示位可以为所述 SOC 的第一个 bit或者为所述指定域的第一个 bit。 其中, 参照表 1可知, 此处描述的指定域可以为 No.20。
303、 局端根据待发送 SOC消息中的超帧指示位, 确定上行导频序列 索引值。 其中, 步骤 303的具体实现方式为局端确定超帧指示位所在的超帧, 然后对应超帧生成相应的上行序列索引值。具体的如何根据对应超帧生成 相应的上行序列索引值为现有技术, 此处不再赘述。
例如, 当一个 SOC消息可以由同一个超帧承载时, 则无论在初始配 置的超帧指示位为所述 SOC消息的第一个 bit还是所述指定域 No.20的第 一个 bit, 这两个 bit位对应的超帧是相同的, 因此, 根据不同的超帧指示 位确定的上行导频序列索引值就是相同的。
当一个 SOC消息需要由连续两个超帧承载, 并且域 No.20位于第二 个超帧时, 则此时所述 SOC消息的第一个 bit和指定域 No.20 的第一个 bit 就位于两个不同的超帧, 因此, 根据不同的超帧指示位确定的上行导 频序列索引值就是不同的,并且两个索引值的差值为不同超帧指示位对应 的超帧号的差值。
304、局端将所述上行导频序列索引值携带在所述待发送 SOC消息的 所述指定域中发送至所述客户端。
305、 客户端解调所述 SOC消息获取到第一上行导频序列索引值。
306、客户端获取承载所述 SOC消息中的超帧指示位的符号对应的第 一超帧以及完成解调所述 SOC消息时的第二超帧。
值得说明的是, 在确定第一超帧时, 并不需要解析该 SOC消息, 只 需要记录承载超帧指示位的 OFDM符号对应的超帧即可, 而第二超帧则 要求客户端必须进行解调出指定域信息时对应的超帧。 由于 SOC消息本 身有一定长度的, 因此客户端解调 SOC消息都需要一定的时间, 也就是 说, 第二超帧和第一超帧一般都是不同的。
307、 客户端根据所述第一超帧与第二超帧之间的偏移值以及所述第 一上行导频序列索引值, 确定第二上行导频序列索引值。
其中,所述第一超帧与第二超帧之间的偏移值可以使用第一超帧和第 二超帧的超帧号的差值来标识, 例如第一超帧为 900号超帧, 第二超帧为 904号超帧, 则偏移值为 4。 则此时客户端使用的上行导频序列索引值就 应该是以客户端在指定域 No.20 解调出来的上行导频序列索引值为基础 再偏移 4个索引值得到的另一个上行导频序列索引值。
308、 客户端根据系统超帧结构以及下行同步符号的时间点, 确定上 行同步符号的时间点。 之间没有严格的顺序要求, 可以先获得一个再获得另一个, 也可以同时获 得, 即步骤 308可在步骤 305之前, 或者两者同时进行, 步骤 308也可在 步骤 305-307之间发生, 只要在发送上下导频序列中的比特值时上行导频 序列索引值和上行同步符合时间点都已确定即可。
309、客户端根据所述上行导频序列索引值, 在上行同步符号时间点, 发送所述上行导频序列中的比特值。
在本实现方式中, 由于在原有的 SOC消息中添加新的信息, 因此, SOC 消息包含的信息内容会比较多, 进而其传输长度也就随着变长了, 这样就会引入同一个 SOC不能在一个超帧内完成传输, 也就是说, 存在 跨帧的情况出现, 为了实现上行导频序列同步, 规避跨帧的影响, 局端和 以保证上行导频序列索引值传输的正确性。
在如图 8所示的流程中,为传输上行导频序列索引值定义了新的 SOC 消息, 该 SOC消息结构可参见下表 2。
SOC消息格式 2
Figure imgf000022_0001
该流程包括:
401、 局端向客户端发送上行导频序列。
402、局端将所述上行导频序列索引值携带在待发送 SOC消息的指定 域中, 并在同一超帧内重复发送至所述客户端。
在此值得说明的是, 由于新定义的 SOC消息长度很短, 因此, 可以 在同一超帧内重复发送,但为避免出现多次重复发送时最后一次发送 SOC 消息出现跨帧的情况出现, 则当确定所述超帧内剩余时隙小于传输所述 SOC消息所需的时隙时, 则所述剩余时隙仅传输空闲符号。
并且, 由于不存在跨超帧的情况, 所以域 No.2所指示的上行导频序 列索引值所对应的超帧可以根据一定的规则进行很明确的定义,例如这个 上行导频序列索引值所对应的超帧是客户端接收到该消息后的第 M个超 帧上所应该发送的导频序列比特值。
403、客户端从所述 SOC消息的指定域中提取所述上行导频序列索引 值。
404、 客户端根据系统超帧结构以及下行同步符号的时间点, 确定上 行同步符号的时间点。
405、客户端根据所述上行导频序列索引值, 在上行同步符号时间点, 发送所述上行导频序列中的比特值。
另外, 在重复发送 SOC消息过程中, 并不要求每个 SOC消息一定要 连续发送, 多个 SOC消息之间也可以发送其它的消息。
在本实现方式中, 定义了新的 SOC消息, 并提供了重复发送的机制 以保证客户端可以确定准确地获取到上行导频序列索引值,进而实现上行 导频序列索引值的同步。
并且, 为了规避跨帧的影响, 对不足以传输完整 SOC消息的时隙全 部使用空闲符号来填充, 以保证上行导频序列索引值传输的正确性。
在如图 9所示的流程中, 为传输上行导频序列索引值而在 TDD系统 的初始化过程中使用标记子载波。
该流程包括:
501、 局端向客户端发送上行导频序列。 502、 局端使用下行同步符号中的标记子载波对所述上行导频序列索 引值进行调制, 得到指示消息。
503、 局端将所述指示消息发送至所述客户端。
503、 客户端根据下行同步符号的标记子载波对所述指示信息进行解 调, 得到所述上行导频序列索引值。
504、 客户端根据系统超帧结构以及下行同步符号的时间点, 确定上 行同步符号的时间点。
505、客户端根据所述上行导频序列索引值, 在上行同步符号时间点, 发送所述上行导频序列中的比特值。
在本实现方式中,通过使用标记子载波来对上行导频序列索引值进行 调制, 并传输调制结果来实现上行导频序列索引值的传输, 由于标记子载 波在 TDD系统初始化的过程中是空闲的, 因此, 使用该子载波来传输上 行导频序列索引值,同样不需要为上行导频序列索引值的传输额外设置新 的传输机制, 简化了系统构成, 降低了系统实现复杂度。
本发明实施例提供了一种局端设备,可用于实现如图 3至图 8所示的 局端侧的方法流程。
如图 10所示, 包括:
第一发送单元 61 , 用于向客户端发送上行导频序列。
第二发送单元 62 , 用于将上行导频序列索引值携带在专用操作信道 s o c消息的指定域中发送至所述客户端。
可选的是, 如图 11所示, 所述第二发送单元 62包括:
获取模块 621 , 用于获取待发送 SOC 消息中的超帧指示位以及指定 域。
确定模块 622 , 用于根据所述获取模块 621 获取的待发送 SOC消息 中的超帧指示位, 确定上行导频序列索引值。
第一发送模块 623 , 用于将所述确定模块 622确定的上行导频序列索 引值携带在 SOC消息的指定域中发送至所述客户端。
其中,所述超帧指示位为所述 SOC消息的第一个 bit或者为所述指定 域的第一个 bit。
可选的是, 所述第二发送单元 62还用于在同一超帧内, 将在指定域 携带有上行导频序列索引值的 SOC消息重复发送; 当确定所述超帧内剩 余时隙小于传输所述 SOC消息所需的时隙时, 则所述剩余时隙仅传输空 闲符号。
可选的是, 所述第二发送单元 62用于使用下行同步符号中的标记子 载波对所述上行导频序列索引值进行调制, 得到指示消息, 并将所述指示 消息发送至所述客户端。
本发明实施例提供了一种客户端设备,可用于实现如图 3至图 8所示 的客户端侧的方法流程。 如图 12所示, 包括:
获取单元 71 , 用于获取上行导频序列、 下行同步符号的时间点以及 上行导频序列索引值。
确定单元 72 , 用于根据系统超帧结构以及所述获取单元 71获取到的 所述下行同步符号的时间点, 确定上行同步符号的时间点。
接收单元 73 , 用于接收局端发送的 SOC消息。
提取单元 74 , 用于从所述接收单元 73接收的 SOC消息的指定域中 提取上行导频序列索引值。
发送单元 75 ,用于根据所述提取单元 74得到的上行导频序列索引值, 在所述确定单元 72上行同步符号时间点, 发送所述上行导频序列中的比 特值。
可选的是, 所述获取单元 71用于将局端所发送的下行导频序列作为 上行导频序列。
可选的是, 如图 13所示, 所述发送单元 75包括:
解调模块 751 , 用于解调所述 SOC 消息获取到第一上行导频序列索 引值。
获取模块 752 , 用于获取承载所述 SOC 消息中的超帧指示位的符号 对应的第一超帧以及完成解调所述 SOC消息时的第二超帧。
确定模块 753 , 用于根据所述获取模块 742获取的第一超帧与第二超 帧之间的偏移值以及所述解调模块 741得到的第一上行导频序列索引值, 确定第二上行导频序列索引值。
发送模块 754 , 用于根据所述确定模块 753得到的上行导频序列索引 值, 在所述确定单元 72上行同步符号时间点, 发送所述上行导频序列中 的比特值。
可选的是, 所述提取单元 74可以用于接收局端发送的指示消息, 所 述指示消息为局端使用下行同步符号中的标记子载波对所述上行导频序 列索引值进行调制, 得到指示消息; 根据下行同步符号的标记子载波对所 述指示信息进行解调, 得到所述上行导频序列索引值。
可选的是, 如图 14所示, 所述确定单元 72包括:
第一确定模块 721 , 用于根据所述系统超帧结构, 确定所述上行同步 符号的时间点与所述下行同步符号的时间 , 之间的时间偏移量。
第二确定模块 722 , 用于根据所述第一确定模块 721确定的下行同步 符号的时间点以及所述时间偏移量, 确定所述上行同步符号的时间点。
本发明实施例提供的一种上行导频序列同步的设备,仅要求局端向客 户端发送导频序列和导频序列索引值即可, 后续客户端可以根据这些信 完成上行导频序列的发送。相比于现有技术中局端必须要通过特殊调制来 告知客户端下行同步符号的时间点,以便客户端能够确定上行同步符号的 时间点来说, 不需要通知下行同步符号的时间点, 该流程更为简洁, 降低 了系统复杂度, 可以极大地节约系统资源开销。
本发明实施例还提供了一种局端设备, 如图 15所示, 包括: 处理器 81、 存储器 82和输入输出接口 83 , 其中, 所述存储器 82被配置有代码, 所述处理器 81用于调用存储器 82内存储的代码以实现前述如图 2至图 7 所示的局端侧的方法流程。 所述输入输出接口 83 用于与系统外部通信, 将外部发送来的消息传送给处理器,将处理器指示发送的消息发送出去。 以上三个单元均可以通过总线进行通信。
所述输入输出接口 83 , 用于向客户端发送上行导频序列; 将上行导 频序列索引值携带在专用操作信道 SOC消息的指定域中发送至所述客户 端。
所述存储器 82用于存储上行导频序列以及上行导频序列索引值。 所述处理器 81 , 用于获取待发送 SOC消息中的超帧指示位以及指定 域; 根据待发送 SOC消息中的超帧指示位, 确定上行导频序列索引值。
所述输入输出接口 83 , 用于将所述上行导频序列索引值携带在所述 待发送 SOC消息的所述指定域中发送至所述客户端。
其中,所述超帧指示位为所述 SOC消息的第一个 bit或者为所述指定 域的第一个 bit。
所述输入输出接口 83 , 用于在同一超帧内, 将在指定域携带有上行 导频序列索引值的 SOC消息重复发送; 当确定所述超帧内剩余时隙小于 传输所述 SOC消息所需的时隙时, 则所述剩余时隙仅传输空闲符号。
可选的是, 所述处理器 81 , 还用于使用下行同步符号中的标记子载 波对所述上行导频序列索引值进行调制, 得到指示消息。
所述输入输出接口 83 , 用于将所述指示消息发送至所述客户端。
本发明实施例还提供了一种局端设备, 如图 16所示, 包括: 处理器 91、 存储器 92和输入输出接口 93 , 其中, 所述存储器 92被配置有代码, 所述处理器 91用于调用存储器 92内存储的代码以实现前述如图 2至图 7 所示的局端侧的方法流程。 所述输入输出接口 93 用于与系统外部通信, 将外部发送来的消息传送给处理器,将处理器指示发送的消息发送出去。 以上三个单元均可以通过总线进行通信。
所述处理器 91 , 获取上行导频序列以及下行同步符号的时间点; 根 据系统超帧结构以及所述下行同步符号的时间点,确定上行同步符号的时 间点; 接收局端发送的 SOC消息, 并从所述 SOC消息的指定域中提取上 行导频序列索引值; 根据所述上行导频序列索引值, 在所述上行同步符号 时间点, 发送所述上行导频序列中的比特值。
所述输入输出接口 93 , 用于根据所述上行导频序列索引值, 在所述 上行同步符号时间点, 发送所述上行导频序列中的比特值 。
所述存储器 92 , 用于存储上行导频序列、 下行同步符号的时间点以 及上行导频序列索引值。 上行导频序列。
可选的是, 所述处理器 91 , 用于解调所述 SOC消息获取到第一上行 导频序列索引值; 获取承载所述 SOC消息中的超帧指示位的符号对应的 第一超帧以及完成解调所述 SOC消息时的第二超帧; 根据所述第一超帧 与第二超帧之间的偏移值以及所述第一上行导频序列索引值,确定第二上 行导频序列索引值。
可选的是, 所述处理器 91 , 用于接收局端发送的指示消息, 所述指 示消息为局端使用下行同步符号中的标记子载波对所述上行导频序列索 引值进行调制, 得到指示消息; 根据下行同步符号的标记子载波对所述指 示信息进行解调, 得到所述上行导频序列索引值;根据所述第二上行导频 序列索引值, 在所述上行同步符号时间点, 发送所述上行导频序列中的比 特值。
可选的是, 所述处理器 91 , 用于根据所述系统超帧结构, 确定所述 上行同步符号的时间点与所述下行同步符号的时间 ,、之间的时间偏移量; 根据所述下行同步符号的时间点以及所述时间偏移量,确定所述上行同步 符号的时间点。
本发明实施例提供的一种上行导频序列同步的设备,仅要求局端向客 户端发送导频序列和导频序列索引值即可, 后续客户端可以根据这些信 完成上行导频序列的发送。相比于现有技术中局端必须要通过特殊调制来 告知客户端下行同步符号的时间点,以便客户端能够确定上行同步符号的 时间点来说, 不需要通知下行同步符号的时间点, 该流程更为简洁, 降低 了系统复杂度, 可以极大地节约系统资源开销。 局端设备 1001和客户端设备 1002 ,所述局端设备 1001和客户端设备 1002 相连;所述局端设备 1001是上述多个实施例中任意一个限定的局端设备, 所述客户端设备 1002是上述多个实施例中任意一个限定的客户端设备。
通过以上的实施方式的描述,所属领域的技术人员可以清楚地了解到 本发明可借助软件加必需的通用硬件的方式来实现, 当然也可以通过硬 件, 但很多情况下前者是更佳的实施方式。 基于这样的理解, 本发明的技 术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式 体现出来, 该计算机软件产品存储在可读取的存储介质中, 如计算机的软 盘, 硬盘或光盘等, 包括若干指令用以使得一台计算机设备(可以是个人 计算机, 服务器, 或者网络设备等) 执行本发明各个实施例所述的方法。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局 限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可 轻易想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明 的保护范围应以所述权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种上行导频序列同步的方法, 其特征在于, 包括:
向客户端发送上行导频序列;
将上行导频序列索引值携带在专用操作信道 SOC消息的指定域中发送 至所述客户端。
2、 根据权利要求 1所述的方法, 其特征在于, 所述将上行导频序列索 引值携带在 SOC消息的指定域中发送至所述客户端包括:
获取待发送 SOC消息中的超帧指示位以及指定域;
根据待发送 SOC消息中的超帧指示位, 确定上行导频序列索引值; 将所述上行导频序列索引值携带在 SOC消息的所述指定域中发送至所 述客户端。
3、 根据权利要求 2所述的方法, 其特征在于, 所述超帧指示位为所述 SOC消息的第一个 bit或者为所述指定域的第一个 bit。
4、 根据权利要求 1所述的方法, 其特征在于, 所述将上行导频序列索 引值携带在 SOC消息的所述指定域中发送至所述客户端包括:
在同一超帧内, 将在指定域携带有上行导频序列索引值的 SOC消息重 复发送;
当确定所述超帧内剩余时隙小于传输所述 SOC消息所需的时隙时, 则 所述剩余时隙仅传输空闲符号。
5、 一种上行导频序列同步的方法, 其特征在于, 包括:
获取上行导频序列以及下行同步符号的时间点;
根据系统超帧结构以及所述下行同步符号的时间点, 确定上行同步符 号的时间点;
接收局端发送的 SOC消息, 并从所述 SOC消息的指定域中提取上行 导频序列索引值;
根据所述上行导频序列索引值, 在所述上行同步符号时间点, 发送所 述上行导频序列中对应的比特值。
6、 根据权利要求 5 所述的方法, 其特征在于, 所述接收局端发送的 SOC消息, 并从所述 SOC消息的指定域中提取上行导频序列索引值; 根据 所述上行导频序列索引值, 在所述上行同步符号时间点, 发送所述上行导 频序列中的比特值具体包括:
接收局端发送的 SOC消息, 并从所述 SOC消息的指定域中提取第一 上行导频序列索引值;
获取承载所述 S 0 C消息中的超帧指示位的符号对应的第一超帧以及完 成解调所述 SOC消息时的第二超帧;
根据所述第一超帧与第二超帧之间的偏移值以及所述第一上行导频序 列索引值, 确定第二上行导频序列索引值;
根据所述第二上行导频序列索引值, 在所述上行同步符号时间点, 发 送所述上行导频序列中对应的比特值。
7、 根据权利要求 5或 6所述的方法, 其特征在于, 所述根据系统超帧 结构以及所述下行同步符号的时间点, 确定上行同步符号的时间点包括: 根据所述系统超帧结构, 确定所述上行同步符号的时间点与所述下行 同步符号的时间 , 之间的时间偏移量;
根据所述下行同步符号的时间点以及所述时间偏移量, 确定所述上行 同步符号的时间点。
8、 一种局端设备, 其特征在于, 包括:
第一发送单元, 用于向客户端发送上行导频序列;
第二发送单元, 用于将上行导频序列索引值携带在专用操作信道 SOC 消息的指定域中发送至所述客户端。
9、 根据权利要求 8所述的局端设备, 其特征在于, 所述第二发送单元 包括:
获取模块, 用于获取待发送 SOC消息中的超帧指示位以及指定域; 确定模块, 用于根据所述获取模块获取的待发送 SOC消息中的超帧指 示位, 确定上行导频序列索引值;
第一发送模块, 用于将所述确定模块确定的上行导频序列索引值携带 在所述待发送 SOC消息的所述指定域中发送至所述客户端。
10、 根据权利要求 9所述的局端设备, 其特征在于, 所述超帧指示位 为所述 SOC消息的第一个 bit或者为所述指定域的第一个 bit。
11、 根据权利要求 8所述的局端设备, 其特征在于, 所述第二发送单 元还用于在同一超帧内,将在指定域携带有上行导频序列索引值的 SOC消 息重复发送; 当确定所述超帧内剩余时隙小于传输所述 SOC消息所需的时 隙时, 则所述剩余时隙仅传输空闲符号。
12、 一种客户端设备, 其特征在于, 包括:
获取单元, 用于获取上行导频序列以及下行同步符号的时间点; 所述 获取下行同步符号的时间点包括将检测到下行同步符号的时间作为下行同 步符号的时间点;
确定单元, 用于根据系统超帧结构以及所述获取单元获取到的所述下 行同步符号的时间点, 确定上行同步符号的时间点;
接收单元, 用于接收局端发送的 SOC消息;
提取单元, 用于从所述接收单元接收的 SOC消息的指定域中提取上行 导频序列索引值;
发送单元, 用于根据所述提取单元得到的上行导频序列索引值, 在所 述确定单元上行同步符号时间点,发送所述上行导频序列中对应的比特值。
13、 根据权利要求 12所述的客户端设备, 其特征在于, 所述发送单元 包括:
解调模块, 用于解调所述 SOC消息获取到第一上行导频序列索引值; 获取模块, 用于获取承载所述 SOC消息中的超帧指示位的符号对应的 第一超帧以及完成解调所述 SOC消息时的第二超帧;
确定模块, 用于根据所述获取模块获取的第一超帧与第二超帧之间的 偏移值以及所述解调模块得到的第一上行导频序列索引值, 确定第二上行 导频序列索引值;
所述发送单元, 用于根据所述提取单元得到的第二上行导频序列索引 值, 在所述确定单元上行同步符号时间点, 发送所述上行导频序列中对应 的比特值。
14、 根据权利要求 12或 13所述的客户端设备, 其特征在于, 所述确 定单元包括:
第一确定模块, 用于根据所述系统超帧结构, 确定所述上行同步符号 的时间点与所述下行同步符号的时间 ,、之间的时间偏移量;
第二确定模块, 用于根据所述第一确定模块确定的下行同步符号的时 间点以及所述时间偏移量, 确定所述上行同步符号的时间点。
15、 一种上行导频序列同步的系统, 其特征在于, 包括如权利要求 8 至 11任意一项所述的局端设备以及如权利要求 12至 14任意一项所述的客 户端设备。
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