WO2014086040A1 - 一种自适应波道带宽切换方法和系统 - Google Patents

一种自适应波道带宽切换方法和系统 Download PDF

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Publication number
WO2014086040A1
WO2014086040A1 PCT/CN2012/086178 CN2012086178W WO2014086040A1 WO 2014086040 A1 WO2014086040 A1 WO 2014086040A1 CN 2012086178 W CN2012086178 W CN 2012086178W WO 2014086040 A1 WO2014086040 A1 WO 2014086040A1
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WIPO (PCT)
Prior art keywords
frame
end device
symbol rate
channel bandwidth
microwave
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PCT/CN2012/086178
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English (en)
French (fr)
Inventor
胡培
胡新士
尹际雄
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华为技术有限公司
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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/CN2012/086178 priority Critical patent/WO2014086040A1/zh
Priority to CN201280002302.1A priority patent/CN103222218B/zh
Priority to EP12889731.1A priority patent/EP2922260B1/en
Priority to RU2015127082/07A priority patent/RU2598537C1/ru
Publication of WO2014086040A1 publication Critical patent/WO2014086040A1/zh
Priority to US14/731,001 priority patent/US9730235B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • H04L1/008—Formats for control data where the control data relates to payload of a different packet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Definitions

  • the invention belongs to the field of microwaves, and in particular relates to an adaptive channel bandwidth switching method and system. Background technique
  • link availability is an important measure of link quality. Availability is the ratio of the available time to the unavailability of the remaining time to the total working time of the device. In practical applications, link availability can be affected by factors such as weather changes and external signal interference.
  • QAM Quadature Amplitude Modulation
  • 16QAM 16QAM
  • 32QAM 32QAM
  • 64QAM 64QAM
  • the 64QAM modulation mode has higher sensitivity than the 32QAM modulation mode, and the link transmission capacity is large. Low interference capability.
  • a modulation mode in which the number of end points of the signal vector is large is referred to as a high modulation mode, and a low modulation mode.
  • ACM Adaptive Coding and Modulation
  • the ACM function reduces the sensitivity of the microwave system and improves the link availability by reducing the transmission modulation mode.
  • the ACM function re-improves the transmission modulation mode and increases the link. Transmission capacity.
  • an embodiment of the present invention provides an adaptive channel bandwidth switching method and system, which aims to solve the prior art lacking other effective methods for improving link availability in addition to ACM, and the ACM technology has been in a modulation mode. In the case of the lowest modulation mode, the link availability cannot be effectively improved, and thus the technical problem of transmission of high priority services cannot be guaranteed.
  • the adaptive channel bandwidth switching method includes: a sending end device buffering service data to be sent; and a sending end device sending a first microwave frame to a receiving end device according to a symbol rate corresponding to an initial channel bandwidth, where The frame header of a microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, and the payload portion of the first microwave frame carries a random symbol;
  • the receiving configuration of the transition frame with the symbol rate corresponding to the target channel bandwidth is performed;
  • the transmitting device continuously transmits the second microwave frame to the receiving device according to the symbol rate corresponding to the target channel bandwidth, where the The frame header of the second microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, and the payload portion of the second microwave frame carries a random symbol;
  • the configuration related to the symbol rate is switched; the receiving device performs symbol
  • the frame header of the fourth microwave frame indicates that the next frame is a normal frame and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, and the payload portion of the fourth microwave frame carries the service symbol, thereby completing the channel bandwidth.
  • the sending end device before the sending end device caches the service data to be sent, the sending end device further includes: sending, by the sending end device, the fifth microwave according to a symbol rate corresponding to the initial channel bandwidth
  • the frame to the receiving device, the frame header of the fifth microwave frame indicates that the next frame is a transition frame, and the symbol rate of the next frame is a symbol rate corresponding to the initial channel bandwidth, and the payload portion of the fifth microwave frame carries The service symbol; the receiving configuration of the transition frame of the symbol rate corresponding to the initial channel bandwidth after the receiving device completes the processing of the fifth microwave frame.
  • the method before the sending, by the sending device, the fifth microwave frame, the method further includes: the IF module of the sending device receives the signal quality information from the receiving device And forwarding the signal quality information to the service multiplexing module of the sending end device; the service multiplexing module of the sending end device sends the signal quality information to the adaptive modulation mode of the transmitting end device and the channel bandwidth sending module; The adaptive modulation mode and the channel bandwidth sending module of the device determine, according to the signal quality information, whether to perform channel bandwidth switching, and if necessary, send a handover request to the service multiplexing module of the transmitting device.
  • the method further includes: an intermediate frequency module of the receiving end device The signal quality information is fed back to the adaptive modulation mode and the channel bandwidth receiving module of the receiving device; the adaptive modulation mode of the receiving device and the channel bandwidth receiving module notify the service multiplexing module of the receiving device to send the signal quality information. Go to the sending device.
  • the sending, by the sending end device, after the receiving end device completes the equalizer convergence, sending the third microwave frame to the receiving end device according to the symbol rate corresponding to the target channel bandwidth specifically includes: sending After the number of transmissions of the second microwave frame reaches a preset value, the terminal device sends the third microwave frame to the receiving end device according to the symbol rate corresponding to the target channel bandwidth; or, the sending end device sets a timer and when the timer expires Then, the third microwave frame is sent to the receiving end device according to the symbol rate corresponding to the target channel bandwidth.
  • the adaptive channel bandwidth switching system includes a transmitting end device and a receiving end device, where the sending end device is configured to buffer service data to be sent, and send according to a symbol rate corresponding to an initial channel bandwidth.
  • a first microwave frame to the receiving end device the frame header of the first microwave frame indicates that the next frame is a transition frame, and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, where the first microwave frame is The payload part carries a random symbol, and continuously transmits the second microwave frame to the receiving end device according to the symbol rate corresponding to the target channel bandwidth, where the frame header of the second microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame
  • the payload portion of the second microwave frame carries a random symbol
  • the third microwave frame is sent to the receiving end according to the symbol rate corresponding to the target channel bandwidth.
  • the frame header of the third microwave frame indicates that the next frame is a normal frame and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth
  • the payload portion of the third microwave frame carries a random symbol, stopping Cache the service data to be sent, and send the fourth microwave frame to the receiving device according to the symbol rate corresponding to the target channel bandwidth
  • the frame header of the fourth microwave frame indicates that the next frame is a normal frame and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth
  • the payload portion of the fourth microwave frame carries a service symbol
  • the receiving end device is configured to complete processing of the first microwave frame
  • the receiving configuration of the transition frame whose symbol rate is the symbol rate corresponding to the target channel bandwidth is performed, and after receiving the second microwave frame, the configuration related to the symbol rate is switched, the symbol synchronization is performed, the frame synchronization is performed, and the equalizer is performed.
  • the sending end device is further configured to send the fifth microwave frame to the receiving end device according to a symbol rate corresponding to the initial channel bandwidth before buffering the service data to be sent.
  • the frame header of the fifth microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame is a symbol rate corresponding to the initial channel bandwidth, and the payload portion of the fifth microwave frame carries a service symbol;
  • the device is further configured to perform a receiving configuration of the transition frame of the symbol rate corresponding to the initial channel bandwidth after the processing of the fifth microwave frame is completed.
  • the sending end device is further configured to: before receiving the fifth microwave frame, receive signal quality information from the receiving end device according to The signal quality information determines whether channel bandwidth switching is required.
  • the sending end device caches the service data to be sent; the sending end device sends the first microwave frame to the receiving end device according to the symbol rate corresponding to the initial channel bandwidth, and the frame header of the first microwave frame indicates the next The frame is a transition frame and the symbol rate of the next frame is the symbol rate corresponding to the target channel bandwidth.
  • the payload portion of the first microwave frame carries a random symbol; after receiving the processing of the first microwave frame, the receiving device performs a receiving configuration of a transition frame whose symbol rate is a symbol rate corresponding to the target channel bandwidth; the transmitting device follows the target channel.
  • the symbol rate corresponding to the bandwidth continuously sends the second microwave frame to the receiving end device, the frame header of the second microwave frame indicates that the next frame is a transition frame, and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth.
  • the payload portion of the second microwave frame carries a random symbol; after receiving the second microwave frame, the receiving segment device switches the configuration related to the symbol rate; the receiving device performs frame synchronization; the receiving device performs equalizer convergence; After the receiver device completes the equalizer convergence, the terminal device sends the third microwave frame to the receiving device according to the symbol rate corresponding to the target channel bandwidth, where the frame header of the third microwave frame indicates that the next frame is a normal frame and the next frame
  • the symbol rate is a symbol rate corresponding to the target channel bandwidth, and the payload portion of the third microwave frame carries a random symbol; After the processing of the three microwave frames, the receiving configuration of the normal frame with the symbol rate corresponding to the target channel bandwidth is performed; the transmitting device stops buffering the service data to
  • the frame header of the fourth microwave frame indicates that the next frame is a normal frame, and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, and the payload of the fourth microwave frame Part of the service symbol is carried, thereby completing the switching of the channel bandwidth.
  • the embodiment of the present invention provides an adaptive channel bandwidth switching method. When the same modulus sampling rate is used, the smaller the channel bandwidth, the larger the signal to noise ratio, and the link. The higher the availability, the more effective a way to increase link availability.
  • FIG. 1 is a flowchart of an adaptive channel bandwidth switching method according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of an adaptive channel bandwidth switching system according to an embodiment of the present invention
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 1 shows an adaptive channel bandwidth switching method according to a first embodiment of the present invention.
  • the method in this embodiment includes the following steps:
  • Step S101 The sending end device caches service data to be sent.
  • the service data may be Ethernet service data or other microwave service data.
  • the service data to be sent is buffered, which is used to ensure that the receiving device can receive all the processing service data and prevent data loss, so that the lossless channel bandwidth can be switched.
  • Step S102 The transmitting end device sends the first microwave frame to the receiving end device according to the symbol rate corresponding to the initial channel bandwidth, where the frame header of the first microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame is a target.
  • the symbol rate corresponding to the channel bandwidth, and the payload portion of the first microwave frame carries a random symbol.
  • microwave frames there are two kinds of microwave frames, which are a normal frame and a transition frame, wherein the normal frame is used for transmitting service data, and the transition frame is used for performing symbol synchronization and frame synchronization operations on the receiving end device when the channel bandwidth is switched.
  • the first microwave frame in this embodiment is a transition frame, and the payload portion of the first microwave frame carries a random symbol.
  • the normal frame and the transition frame in this embodiment use the same microwave frame structure, as shown in Table 1, including the preamble, AMAC (Adaptive Modulation and Adaptive Channel bandwidth) header field, Plt. (Pi lot, pilot) field and Pld (payload, payload) field.
  • the preamble is a fixed sequence, and the length is 32 symbols, which is used to identify the frame header of the air interface frame.
  • the length of the AMAC header field is 16 symbols, and the information carried in the AMAC header in the normal frame is used to identify different symbol rates. .
  • the information carried in the AMAC head in the transition frame represents a transition frame that switches from the source symbol rate and the modulation mode to the target symbol rate;
  • the Pit field is a pilot symbol, and the length is a single symbol, used for frequency offset correction and anti-phase noise, phase jump
  • the Pld field is the payload field, which is the service data in the normal frame and the random symbol in the transition frame.
  • the transition frame may be shorter than the frame length of the normal frame.
  • the frame length of the transition frame may be one quarter of the frame length of the normal frame.
  • the channel bandwidth is switched by using an advance frame.
  • the so-called advance frame is used to notify the next device in advance of the current frame, so that the receiving device can perform handover preparation.
  • the AMAC header field of the current frame Indicates whether the next frame is a normal frame or a transition frame and the next frame symbol rate.
  • this embodiment defines Index1, Index2, transition Index1, and transition Index2.
  • Different Index indicates that the AMAC number carried in the AMAC header field is different, and is used to indicate whether the next frame is a normal frame or a transition frame and a symbol rate of the next frame. . Assume that the initial channel bandwidth is 500M and the target channel bandwidth is 250M in this embodiment.
  • the modulation mode is unchanged during channel bandwidth switching, assuming QPSK (quadature phase shift keying) modulation mode, Indexl A normal frame for indicating a QPSK modulation mode at a symbol rate of 500 M; Index 2 is used to represent a normal frame of a QPSK modulation mode at a symbol rate of 250 M; a transition index 1 is used to represent a transition frame of a QPSK modulation mode at a symbol rate of 500 M; a transition index 2 A transition frame used to represent the QPSK modulation mode at a 250M symbol rate.
  • the AMAC header field of the first microwave frame in this embodiment carries a transition index 2 for indicating a transition frame of the QPSK modulation mode in the next frame at a symbol rate of 250M.
  • the microwave frame is generated by the service multiplexing module of the transmitting device.
  • the microwave frame is generated by the service multiplexing module of the transmitting device.
  • other generating modes may be used.
  • Step S103 After receiving the processing of the first microwave frame, the receiving end device performs a receiving configuration of a transition frame whose symbol rate is a symbol rate corresponding to the target channel bandwidth.
  • Step S104 The transmitting end device continuously sends the second microwave frame to the receiving end device according to the symbol rate corresponding to the target channel bandwidth, where the frame header of the second microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame is The symbol rate corresponding to the target channel bandwidth, and the payload portion of the second microwave frame carries a random symbol.
  • the AMAC header field of the second microwave frame carries a transition index 2, which is used to indicate a transition frame of the QPSK modulation mode in the next frame at a symbol rate of 250M.
  • the second microwave frame continues to be transmitted, The number of transmissions is related to the time required for the receiving device to complete the equalizer convergence.
  • Step S105 After receiving the second microwave frame, the receiving segment device switches the configuration related to the symbol rate, performs symbol synchronization, performs frame synchronization, and performs equalizer convergence.
  • the receiving segment device switches the configuration related to the symbol rate, such as setting an AAF (anti-alias filter) bandwidth, shielding the out-of-band signal interference, Set the carrier loop, etc.;
  • AAF anti-alias filter
  • the equalizer can be converged.
  • the equalizer adaptively adjusts the signal frequency response gain to eliminate multipath interference.
  • symbol rate related configuration symbol synchronization, frame synchronization, and equalizer convergence can be performed in different ways.
  • the random symbols carried in each of the second microwave frames may be in different random code formats. The better the randomness of the random symbols, the better the symbol synchronization of the receiving device.
  • Step S106 After the receiver device completes the equalizer convergence, the transmitting device sends the third microwave frame to the receiving device according to the symbol rate corresponding to the target channel bandwidth, where the frame header of the third microwave frame indicates that the next frame is a normal frame. And the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, and the payload portion of the third microwave frame carries a random symbol.
  • the sending end device sends the third microwave frame to the receiving end device according to the symbol rate corresponding to the target channel bandwidth. That is, the transmitting device controls the number of transmissions of the second microwave frame according to the number of frames required in step S106. Generally, the transmitting device adds a certain margin based on the number of frames required in step S106. In order to ensure that the receiving device can complete the processing of step S106.
  • the receiver device may be used to determine whether the receiver device completes the equalizer convergence.
  • the timer may be set when the first second microwave frame is sent, and then the target channel is followed after the timer expires.
  • the symbol rate corresponding to the bandwidth sends a third microwave frame to the receiving device.
  • the AMAC header field of the third microwave frame carries Index2, and is used to indicate that the next frame is a normal frame of the QPSK modulation mode at a symbol rate of 250M.
  • Step S107 After receiving the processing of the third microwave frame, the receiving end device performs a receiving configuration of a normal frame with a symbol rate corresponding to a symbol rate corresponding to the target channel bandwidth.
  • Step S108 The sending end device stops buffering the service data to be sent.
  • Step S109 The transmitting end device sends a fourth microwave frame to the receiving end device according to a symbol rate corresponding to the target channel bandwidth, where the frame header of the fourth microwave frame indicates that the next frame is a normal frame and the symbol rate of the next frame is a target.
  • the symbol rate corresponding to the channel bandwidth, and the payload portion of the fourth microwave frame carries the service symbol, thereby completing the switching of the channel bandwidth.
  • the AMAC header field of the fourth microwave frame carries Index2, which is used to indicate that the next frame is a normal frame of the QPSK modulation mode at a symbol rate of 250M.
  • the sending device before the sending end device caches the service data to be sent, the sending device may further include:
  • the transmitting end device sends the fifth microwave frame to the receiving end device according to the symbol rate corresponding to the initial channel bandwidth, where the frame header of the fifth microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame is the initial channel bandwidth.
  • the payload part of the fifth microwave frame carries a service symbol.
  • the AMAC header field of the fifth microwave frame carries a transition indexl, which is used to indicate that the next frame is QPSK modulation at a symbol rate of 500M. Transition frame for the pattern.
  • the receiving configuration of the transition frame whose symbol rate is the symbol rate corresponding to the initial channel bandwidth is performed.
  • the sending device may further include: before sending the fifth microwave frame:
  • the intermediate frequency module of the sending end device receives the signal quality information from the receiving end device and forwards the signal quality information to the service multiplexing module of the transmitting end device;
  • the service multiplexing module of the sending end device sends the signal quality information to the adaptive modulation mode of the transmitting end device and the channel bandwidth sending module;
  • the adaptive modulation mode of the transmitting device and the channel bandwidth sending module according to the signal quality information It is determined whether channel bandwidth switching is required, and if necessary, a handover request is sent to the service multiplexing module of the transmitting device.
  • the IF module of the transmitting device Before the IF module of the transmitting device receives the signal quality information from the receiving device, it may also include:
  • the intermediate frequency module of the receiving end device feeds back the signal quality information to the adaptive modulation mode of the receiving end device and the channel bandwidth receiving module;
  • the adaptive modulation mode and the channel bandwidth receiving module of the receiving end device notify the service multiplexing module of the receiving end device to send the signal quality information to the transmitting end device.
  • the symbol synchronization and the frame synchronization time of the receiving device are the main times of the channel bandwidth switching. After calculation, the service interruption caused by the switching has little impact on the service.
  • the symbol rate corresponding to 500M is switched to the symbol rate corresponding to 250M.
  • the signal-to-noise ratio is increased by 3db, which can effectively improve the link availability.
  • the embodiment of the present invention provides an adaptive channel bandwidth switching method.
  • the channel bandwidth is smaller, and the signal to noise ratio is smaller.
  • the larger the link the higher the link availability, thus providing an effective way to increase link availability.
  • FIG. 2 shows an adaptive channel bandwidth switching system according to a first embodiment of the present invention, including a transmitting device 201 and a receiving device 202.
  • the sending end device 201 is configured to buffer the service data to be sent, and send the first microwave frame to the receiving end device according to the symbol rate corresponding to the initial channel bandwidth, where the frame header of the first microwave frame indicates that the next frame is a transition frame and The symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, and the payload portion of the first microwave frame carries a random symbol, and the second microwave frame is continuously sent to the receiving end device according to the symbol rate corresponding to the target channel bandwidth.
  • the frame header of the second microwave frame indicates that the next frame is a transition frame and the symbol rate of the next frame is a symbol rate corresponding to the target channel bandwidth, and the payload portion of the second microwave frame carries a random symbol at the receiving end.
  • the third microwave frame is sent to the receiving end device according to the symbol rate corresponding to the target channel bandwidth, and the frame header of the third microwave frame indicates that the next frame is a normal frame and the symbol rate of the next frame is the target. a symbol rate corresponding to the channel bandwidth, and the payload portion of the third microwave frame carries a random symbol, And stopping to buffer the service data to be sent, and sending the fourth microwave frame to the receiving end device according to the symbol rate corresponding to the target channel bandwidth, where the frame header of the fourth microwave frame indicates that the next frame is a normal frame and the symbol rate of the next frame is The payload portion of the fourth microwave frame carries a service symbol for a symbol rate corresponding to the target channel bandwidth.
  • the receiving end device 202 is configured to perform, after completing processing of the first microwave frame, a receiving configuration of a transition frame whose symbol rate is a symbol rate corresponding to the target channel bandwidth, and after receiving the second microwave frame, switching and symbol rate In the related configuration, symbol synchronization is performed, frame synchronization is performed, equalizer convergence is performed, and after receiving the processing of the third microwave frame, the reception configuration of the normal frame with the symbol rate corresponding to the target channel bandwidth is performed.
  • the sending end device 201 is further configured to send the fifth microwave frame to the receiving end device according to the symbol rate corresponding to the initial channel bandwidth before buffering the service data to be sent, where the frame header of the fifth microwave frame indicates that the next frame is a transition frame and a symbol rate of the next frame is a symbol rate corresponding to the initial channel bandwidth, and a payload portion of the fifth microwave frame carries a service symbol;
  • the receiving end device 202 is further configured to perform a receiving configuration of a transition frame whose symbol rate is a symbol rate corresponding to the initial channel bandwidth after the processing of the fifth microwave frame is completed.
  • the transmitting device 201 is further configured to: before transmitting the fifth microwave frame, receive signal quality information from the receiving device, and determine, according to the signal quality information, whether channel bandwidth switching is required.
  • the structure of the microwave frame in the embodiment may use the structure of the microwave frame in the foregoing method embodiment.
  • the embodiment of the present invention provides an adaptive channel bandwidth switching system. When the same modulus sampling rate is used, the channel bandwidth is smaller, and the signal to noise ratio is smaller. The larger the link, the higher the link availability, thus providing an effective system for improving link availability.

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Abstract

本发明实施例提供一种自适应波道带宽切换方法，包括：发送端设备缓存待发送的业务数据；发送端设备发送第一微波帧到接收端设备；接收端设备完成第一微波帧的处理之后进行接收配置；发送端设备连续发送第二微波帧到接收端设备；接收段设备接收到第二微波帧后，切换与符号率相关的配置；接收端设备进行符号同步；接收端设备进行帧同步；接收端设备进行均衡器收敛；发送端设备在接收端设备完成均衡器收敛之后发送第三微波帧到接收端设备；接收端设备完成第三微波帧的处理之后进行接收配置；发送端设备停止缓存待发送的业务数据；发送端设备发送第四微波帧到接收端设备，从而完成波道带宽的切换。本发明实施例提供了一种有效的提高链路可用度的方法。

Description

说 明 书
一种自适应波道带宽切换方法和系统
技术领域
本发明属于微波领域， 尤其涉及一种自适应波道带宽切换方法和系统。 背景技术
对于微波传输系统， 链路可用度是衡量链路质量的一个重要指标， 可用度 是指除去不可用时间， 剩下的可用时间和设备总的工作时间的比值。 在实际应 用中， 链路可用度会受到天气变化、 外界信号干扰等因素的影响。
QAM ( Quadrature Amplitude Modulation, 正交幅度调制 )是当今主流的 ϋ 波设备使用的一种调制方式， 通常通过信号矢量端点分布图中信号矢量端点个 数来定义不同的调制模式， 如 16QAM, 32QAM, 64QAM等， 数字越大， 灵敏 度越高， 链路的传输容量越大， 抗干扰能力越低,比如相同波道带宽下， 64QAM 调制模式比 32QAM调制模式的灵敏度高， 链路传输容量大， 抗干扰能力低。 为了方便描述， 本文中把信号矢量端点个数较多的调制模式称为高调制模式， 反之为低调制模式。
在当前微波系统中， ACM ( Adaptive Coding and Modulation, 自适应编码 及调制模式）是比较常用的一种提高链路可用度的方法。 在微波链路信号质量 劣化时， ACM功能通过降低发送调制模式， 来降低微波系统的灵敏度， 提高链 路可用度； 而微波链路信号质量恢复时， ACM功能重新提高发送调制模式， 增 加链路传输容量。
现有技术除了 ACM外，缺乏其它有效的提高链路可用度的方法，并且 ACM 技术在调制模式已经是最低调制模式的情况下无法有效提高链路可用度， 从而 无法保证高优先级业务的传输。 发明内容
鉴于上述问题， 本发明实施例提供一种自适应波道带宽切换方法和系统， 旨在解决现有技术除了 ACM外， 缺乏其它有效的提高链路可用度的方法， 并 且 ACM技术在调制模式已经是最低调制模式的情况下无法有效提高链路可用 度， 从而无法保证高优先级业务的传输的技术问题。
第一方面， 所述自适应波道带宽切换方法包括： 发送端设备緩存待发送的 业务数据； 发送端设备按照初始波道带宽对应的符号率发送第一微波帧到接收 端设备， 所述第一微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率为目 标波道带宽对应的符号率， 所述第一微波帧的净荷部分携带随机符号； 接收端 设备完成第一微波帧的处理之后进行符号率为目标波道带宽对应的符号率的过 渡帧的接收配置； 发送端设备按照目标波道带宽对应的符号率连续发送第二微 波帧到接收端设备， 所述第二微波帧的帧头指示下一帧为过渡帧并且下一帧的 符号率为目标波道带宽对应的符号率， 所述第二微波帧的净荷部分携带随机符 号； 接收段设备接收到所述第二微波帧后， 切换与符号率相关的配置； 接收端 设备进行符号同步； 接收端设备进行帧同步； 接收端设备进行均衡器收敛； 发 送端设备在接收端设备完成均衡器收敛之后按照目标波道带宽对应的符号率发 送第三微波帧到接收端设备， 所述第三微波帧的帧头指示下一帧为正常帧并且 下一帧的符号率为目标波道带宽对应的符号率， 所述第三微波帧的净荷部分携 带随机符号； 接收端设备完成第三微波帧的处理之后进行符号率为目标波道带 宽对应的符号率的正常帧的接收配置；发送端设备停止緩存待发送的业务数据； 发送端设备按照目标波道带宽对应的符号率发送第四微波帧到接收端设备， 所 述第四微波帧的帧头指示下一帧为正常帧并且下一帧的符号率为目标波道带宽 对应的符号率， 所述第四微波帧的净荷部分携带业务符号， 从而完成波道带宽 的切换。
在第一方面的第一种可能的实现方式中， 所述发送端设备緩存待发送的业 务数据之前还包括： 发送端设备按照初始波道带宽对应的符号率发送第五微波 帧到接收端设备， 所述第五微波帧的帧头指示下一帧为过渡帧并且下一帧的符 号率为初始波道带宽对应的符号率，所述第五微波帧的净荷部分携带业务符号； 接收端设备完成第五微波帧的处理之后进行符号率为初始波道带宽对应的符号 率的过渡帧的接收配置。
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， 发 送端设备发送第五微波帧之前还包括： 发送端设备的中频模块接收来自接收端 设备的信号质量信息并转发所述信号质量信息到发送端设备的业务复接模块； 发送端设备的业务复接模块将所述信号质量信息发送到发送端设备的自适应调 制模式及波道带宽发送模块； 发送端设备的自适应调制模式及波道带宽发送模 块根据所述信号质量信息判断是否需要进行波道带宽切换， 如果需要， 则发送 切换请求到发送端设备的业务复接模块。
结合第一方面的第二种可能的实现方式， 在第三种可能的实现方式中， 所 述发送端设备的中频模块接收来自接收端设备的信号质量信息之前还包括： 接 收端设备的中频模块将信号质量信息反馈给接收端设备的自适应调制模式及波 道带宽接收模块； 接收端设备的自适应调制模式及波道带宽接收模块通知接收 端设备的业务复接模块发送所述信号质量信息到发送端设备。
在第一方面的第四种可能的实现方式中， 所述发送端设备在接收端设备完 成均衡器收敛之后按照目标波道带宽对应的符号率发送第三微波帧到接收端设 备具体包括： 发送端设备在所述第二微波帧的发送数量达到预设值之后按照目 标波道带宽对应的符号率发送第三微波帧到接收端设备； 或者， 发送端设备设 置定时器并在定时器到时之后按照目标波道带宽对应的符号率发送第三微波帧 到接收端设备。
第二方面， 所述自适应波道带宽切换系统， 包括发送端设备和接收端设备， 其中， 所述发送端设备， 用于緩存待发送的业务数据， 按照初始波道带宽对应 的符号率发送第一微波帧到接收端设备， 所述第一微波帧的帧头指示下一帧为 过渡帧并且下一帧的符号率为目标波道带宽对应的符号率， 所述第一微波帧的 净荷部分携带随机符号， 按照目标波道带宽对应的符号率连续发送第二微波帧 到接收端设备， 所述第二微波帧的帧头指示下一帧为过渡帧并且下一帧的符号 率为目标波道带宽对应的符号率， 所述第二微波帧的净荷部分携带随机符号， 在接收端设备完成均衡器收敛之后按照目标波道带宽对应的符号率发送第三微 波帧到接收端设备， 所述第三微波帧的帧头指示下一帧为正常帧并且下一帧的 符号率为目标波道带宽对应的符号率， 所述第三微波帧的净荷部分携带随机符 号， 停止緩存待发送的业务数据， 按照目标波道带宽对应的符号率发送第四微 波帧到接收端设备， 所述第四微波帧的帧头指示下一帧为正常帧并且下一帧的 符号率为目标波道带宽对应的符号率， 所述第四微波帧的净荷部分携带业务符 号； 所述接收端设备， 用于在完成第一微波帧的处理之后进行符号率为目标波 道带宽对应的符号率的过渡帧的接收配置， 在接收到所述第二微波帧后， 切换 与符号率相关的配置， 进行符号同步， 进行帧同步， 进行均衡器收敛， 在完成 第三微波帧的处理之后进行符号率为目标波道带宽对应的符号率的正常帧的接 收配置。
在第二方面的第一种可能的实现方式中， 所述发送端设备还用于在緩存待 发送的业务数据之前按照初始波道带宽对应的符号率发送第五微波帧到接收端 设备， 所述第五微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率为初始 波道带宽对应的符号率， 所述第五微波帧的净荷部分携带业务符号； 所述接收 端设备还用于在完成第五微波帧的处理之后进行符号率为初始波道带宽对应的 符号率的过渡帧的接收配置。
结合第二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 述发送端设备还用于在发送第五微波帧之前， 接收来自接收端设备的信号质量 信息并根据所述信号质量信息判断是否需要进行波道带宽切换。
本发明实施例中， 发送端设备緩存待发送的业务数据； 发送端设备按照初 始波道带宽对应的符号率发送第一微波帧到接收端设备， 所述第一微波帧的帧 头指示下一帧为过渡帧并且下一帧的符号率为目标波道带宽对应的符号率， 所 述第一微波帧的净荷部分携带随机符号； 接收端设备完成第一微波帧的处理之 后进行符号率为目标波道带宽对应的符号率的过渡帧的接收配置； 发送端设备 按照目标波道带宽对应的符号率连续发送第二微波帧到接收端设备， 所述第二 微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率为目标波道带宽对应的 符号率， 所述第二微波帧的净荷部分携带随机符号； 接收段设备接收到所述第 二微波帧后， 切换与符号率相关的配置； 接收端设备进行帧同步； 接收端设备 进行均衡器收敛； 发送端设备在接收端设备完成均衡器收敛之后按照目标波道 带宽对应的符号率发送第三微波帧到接收端设备， 所述第三微波帧的帧头指示 下一帧为正常帧并且下一帧的符号率为目标波道带宽对应的符号率， 所述第三 微波帧的净荷部分携带随机符号； 接收端设备完成第三微波帧的处理之后进行 符号率为目标波道带宽对应的符号率的正常帧的接收配置； 发送端设备停止緩 存待发送的业务数据； 发送端设备按照目标波道带宽对应的符号率发送第四微 波帧到接收端设备， 所述第四微波帧的帧头指示下一帧为正常帧并且下一帧的 符号率为目标波道带宽对应的符号率， 所述第四微波帧的净荷部分携带业务符 号， 从而完成波道带宽的切换。 在 ACM切换之外， 本发明实施例提供了一种 自适应波道带宽切换方法， 当釆用相同的模数釆样率的情况下， 波道带宽越小， 信噪比越大，链路可用度越高，从而提供了一种有效的提高链路可用度的方法。 附图说明
图 1是本发明实施例提供的一种自适应波道带宽切换方法的流程图； 图 2是本发明实施例提供的一种自适应波道带宽切换系统的结构图；
具体实施方式
为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实 施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅 仅用以解释本发明， 并不用于限定本发明。
为了说明本发明所述的技术方案， 下面通过具体实施例来进行说明。
实施例一：
图 1示出了本发明第一实施例提供的一种自适应波道带宽切换方法， 本实 施例中的方法包括下述步骤：
步骤 S101 , 发送端设备緩存待发送的业务数据。
所述业务数据可以是以太业务数据， 也可以是其它微波业务数据。 本实施 例中緩存了待发送的业务数据， 用于保证接收端设备能够全部接收处理业务数 据， 防止数据丟失， 从而可以实现无损波道带宽的切换。
步骤 S102 ,发送端设备按照初始波道带宽对应的符号率发送第一微波帧到 接收端设备， 所述第一微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率 为目标波道带宽对应的符号率， 所述第一微波帧的净荷部分携带随机符号。
本实施例中， 有两种微波帧， 分别为正常帧和过渡帧， 其中正常帧用于传 输业务数据， 过渡帧用于在波道带宽切换时接收端设备进行符号同步、 帧同步 等操作。 本实施例中的第一微波帧是过渡帧， 第一微波帧的净荷部分携带随机 符号。
本实施例中的正常帧和过渡帧釆用相同的微波帧结构，如表 1所示， 包括前 导码、 AMAC ( Adaptive Modulation and Adaptive Channel bandwidth, 自适 应调制模式及波道带宽 ) header字段、 Plt ( Pi lot ,导频）字段和 Pld ( Payload, 净荷）字段。 其中， 前导码为固定的序列， 长度为 32个符号， 用于识别空口帧 的帧头； AMAC header字段的长度为 16个符号， 正常帧中 AMAC header中携带的 信息用于识别不同的符号率。 过渡帧中 AMAC head中携带的信息表示从源符号率 和调制模式切换到目标符号率的过渡帧； Pit字段为导频符号，长度为单个符号， 用于频偏校正和抗相噪、 相跳； Pld字段为净荷字段， 正常帧时为业务数据， 过 渡帧时为随机符号。
前导码 AMAC header Pit Pld Pit Pld 表 1
为了缩短波道带宽的切换时间， 过渡帧可以比正常帧的帧长短一些， 例如 过渡帧的帧长可以是正常帧的帧长的四分之一。
本实施例使用提前帧的方式进行波道带宽的切换， 所谓提前帧， 为在当前 帧提前通知了下一帧的信息， 以便接收端设备进行切换准备， 本实施例中当前 帧的 AMAC header字段指示下一帧是正常帧还是过渡帧以及下一帧符号率。
为方便说明， 本实施例定义了 Indexl、 Index2、 过渡 Indexl和过渡 Index2 , 不同的 Index表示 AMAC header字段携带的 AMAC号不同， 用于指示下一帧是正常 帧还是过渡帧以及下一帧符号率。 假设本实施例中初始波道带宽为 500M, 目标 波道带宽为 250M,波道带宽切换过程中调制模式不变，假设为 QPSK ( quadrature phase shift keying,正交相移键控 )调制模式， Indexl用于表示 500M符号率下 的 QPSK调制模式的正常帧； Index2用于表示 250M符号率下的 QPSK调制模式的正 常帧；过渡 Indexl用于表示 500M符号率下的 QPSK调制模式的过渡帧；过渡 Index2 用于表示 250M符号率下的 QPSK调制模式的过渡帧。 本实施例中的第一微波帧的 AMAC header字段携带过渡 Index2 , 用于表示下一帧为 250M符号率下的 QPSK调制 模式的过渡帧。
本实施例中， 微波帧由发送端设备的业务复接模块产生， 当然， 在其它实 施例中， 可以釆用其它产生方式。
本实施例中，发送第一微波帧的步骤和緩存业务数据的步骤可以同时进行。 步骤 S103 ,接收端设备完成第一微波帧的处理之后进行符号率为目标波道 带宽对应的符号率的过渡帧的接收配置。
步骤 S104,发送端设备按照目标波道带宽对应的符号率连续发送第二微波 帧到接收端设备， 所述第二微波帧的帧头指示下一帧为过渡帧并且下一帧的符 号率为目标波道带宽对应的符号率，所述第二微波帧的净荷部分携带随机符号。
本实施例中， 第二微波帧的 AMAC header字段携带过渡 Index2, 用于表示 下一帧为 250M符号率下的 QPSK调制模式的过渡帧。 第二微波帧持续发送， 发送的数量与接收端设备完成均衡器收敛所需的时间相关。
步骤 S105 , 接收段设备接收到所述第二微波帧后， 切换与符号率相关的配 置， 进行符号同步， 进行帧同步， 进行均衡器收敛。
本实施例中， 接收段设备接收到所述第二微波帧后， 切换与符号率相关的 配置， 如设置 AAF ( anti-alias filter, 抗混叠滤波器） 的带宽， 屏蔽带外信号干 扰， 设置载波环路等； 进行符号同步， 可以釆用 Gardner算法提取误差并找到 最佳釆样点， 进行帧同步， 可以釆用固定序列与接收信号进行相关计算找到微 波帧帧头； 均衡器收敛可以根据帧同步后的信号， 均衡器自适应的调整信号频 率响应增益， 消除多径干扰。
在具体产品实现时， 可以釆用不同的方式进行与符号率相关的配置、 符号 同步、 帧同步以及均衡器收敛。
第二微波帧的帧长越短， 越有利于接收端设备进行帧同步处理。 每一个第 二微波帧中携带的随机符号可以用不同的随机码格式，随机符号的随机性越好， 越有利于接收端设备进行符号同步。
步骤 S106,发送端设备在接收端设备完成均衡器收敛之后按照目标波道带 宽对应的符号率发送第三微波帧到接收端设备， 所述第三微波帧的帧头指示下 一帧为正常帧并且下一帧的符号率为目标波道带宽对应的符号率， 所述第三微 波帧的净荷部分携带随机符号。
本实施例中， 发送端设备在所述第二微波帧的发送数量达到预设值之后按 照目标波道带宽对应的符号率发送第三微波帧到接收端设备。 即发送端设备根 据步骤 S106所需要的帧的数量来控制第二微波帧的发送数量，一般来说，发送 端设备会在步骤 S106所需要的帧的数量的基础上，增加一定的余量， 以保证接 收端设备能够完成步骤 S106的处理。
在其它实施例中，可以釆用其它方式判断接收端设备是否完成均衡器收敛， 例如还可以在发送第一个第二微波帧的时候设置定时器， 然后在定时器到时之 后按照目标波道带宽对应的符号率发送第三微波帧到接收端设备。 本实施例中， 第三微波帧的 AMAC header字段携带 Index2, 用于表示下一 帧为 250M符号率下的 QPSK调制模式的正常帧。
步骤 S107,接收端设备完成第三微波帧的处理之后进行符号率为目标波道 带宽对应的符号率的正常帧的接收配置。
步骤 S108, 发送端设备停止緩存待发送的业务数据。
步骤 S109,发送端设备按照目标波道带宽对应的符号率发送第四微波帧到 接收端设备， 所述第四微波帧的帧头指示下一帧为正常帧并且下一帧的符号率 为目标波道带宽对应的符号率， 所述第四微波帧的净荷部分携带业务符号， 从 而完成波道带宽的切换。
本实施例中， 第四微波帧的 AMAC header字段携带 Index2, 用于表示下一 帧为 250M符号率下的 QPSK调制模式的正常帧。
另外，本实施例中，步骤 S101发送端设备緩存待发送的业务数据之前还可 以包括：
发送端设备按照初始波道带宽对应的符号率发送第五微波帧到接收端设 备， 所述第五微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率为初始波 道带宽对应的符号率， 所述第五微波帧的净荷部分携带业务符号，本实施例中， 第五微波帧的 AMAC header字段携带过渡 Indexl ,用于表示下一帧为 500M符 号率下的 QPSK调制模式的过渡帧。
接收端设备完成第五微波帧的处理之后进行符号率为初始波道带宽对应的 符号率的过渡帧的接收配置。
发送端设备发送第五微波帧之前还可以包括：
发送端设备的中频模块接收来自接收端设备的信号质量信息并转发所述信 号质量信息到发送端设备的业务复接模块；
发送端设备的业务复接模块将所述信号质量信息发送到发送端设备的自适 应调制模式及波道带宽发送模块；
发送端设备的自适应调制模式及波道带宽发送模块根据所述信号质量信息 判断是否需要进行波道带宽切换， 如果需要， 则发送切换请求到发送端设备的 业务复接模块。
发送端设备的中频模块接收来自接收端设备的信号质量信息之前还可以包 括：
接收端设备的中频模块将信号质量信息反馈给接收端设备的自适应调制模 式及波道带宽接收模块；
接收端设备的自适应调制模式及波道带宽接收模块通知接收端设备的业务 复接模块发送所述信号质量信息到发送端设备。
波道带宽的切换过程中， 接收端设备的符号同步和帧同步时间为波道带宽 切换的主要时间， 经过计算， 该切换导致的业务中断对业务的影响很小。
通过计算， 以 500M对应的符号率切换到 250M对应的符号率， 在相同的 模数釆样率下， 信噪比提高 3db, 可以有效提高链路可用度。
本实施例中， 在 ACM切换之外， 本发明实施例提供了一种自适应波道带 宽切换方法， 当釆用相同的模数釆样率的情况下， 波道带宽越小， 信噪比越大， 链路可用度越高， 从而提供了一种有效的提高链路可用度的方法。
图 2示出了本发明第一实施例提供的一种自适应波道带宽切换系统， 包括 发送端设备 201和接收端设备 202。
发送端设备 201 , 用于緩存待发送的业务数据， 按照初始波道带宽对应的 符号率发送第一微波帧到接收端设备， 所述第一微波帧的帧头指示下一帧为过 渡帧并且下一帧的符号率为目标波道带宽对应的符号率， 所述第一微波帧的净 荷部分携带随机符号， 按照目标波道带宽对应的符号率连续发送第二微波帧到 接收端设备， 所述第二微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率 为目标波道带宽对应的符号率， 所述第二微波帧的净荷部分携带随机符号， 在 接收端设备完成均衡器收敛之后按照目标波道带宽对应的符号率发送第三微波 帧到接收端设备， 所述第三微波帧的帧头指示下一帧为正常帧并且下一帧的符 号率为目标波道带宽对应的符号率，所述第三微波帧的净荷部分携带随机符号， 停止緩存待发送的业务数据， 按照目标波道带宽对应的符号率发送第四微波帧 到接收端设备， 所述第四微波帧的帧头指示下一帧为正常帧并且下一帧的符号 率为目标波道带宽对应的符号率， 所述第四微波帧的净荷部分携带业务符号。
接收端设备 202, 用于在完成第一微波帧的处理之后进行符号率为目标波 道带宽对应的符号率的过渡帧的接收配置， 在接收到所述第二微波帧后， 切换 与符号率相关的配置， 进行符号同步， 进行帧同步， 进行均衡器收敛， 在完成 第三微波帧的处理之后进行符号率为目标波道带宽对应的符号率的正常帧的接 收配置。
另外， 发送端设备 201还用于在緩存待发送的业务数据之前按照初始波道 带宽对应的符号率发送第五微波帧到接收端设备， 所述第五微波帧的帧头指示 下一帧为过渡帧并且下一帧的符号率为初始波道带宽对应的符号率， 所述第五 微波帧的净荷部分携带业务符号；
接收端设备 202还用于在完成第五微波帧的处理之后进行符号率为初始波 道带宽对应的符号率的过渡帧的接收配置。
发送端设备 201还用于在发送第五微波帧之前， 接收来自接收端设备的信 号质量信息并根据所述信号质量信息判断是否需要进行波道带宽切换。
本实施例中微波帧的结构等可以釆用前述方法实施例中微波帧的结构。 本实施例中， 在 ACM切换之外， 本发明实施例提供了一种自适应波道带 宽切换系统， 当釆用相同的模数釆样率的情况下， 波道带宽越小， 信噪比越大， 链路可用度越高， 从而提供了一种有效的提高链路可用度的系统。
本领域普通技术人员可以理解， 实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件来完成， 所述的程序可以在存储于一计算机 可读取存储介质中， 所述的存储介质， 如 ROM/RAM、 磁盘、 光盘等。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发 明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明 的保护范围之内。

Claims

权 利 要 求 书
1、 一种自适应波道带宽切换方法， 其特征在于， 包括:
发送端设备緩存待发送的业务数据；
发送端设备按照初始波道带宽对应的符号率发送第一微波帧到接收端设 备， 所述第一微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率为目标波 道带宽对应的符号率， 所述第一微波帧的净荷部分携带随机符号；
接收端设备完成第一微波帧的处理之后进行符号率为目标波道带宽对应的 符号率的过渡帧的接收配置；
发送端设备按照目标波道带宽对应的符号率连续发送第二微波帧到接收端 设备， 所述第二微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率为目标 波道带宽对应的符号率， 所述第二微波帧的净荷部分携带随机符号；
接收段设备接收到所述第二微波帧后， 切换与符号率相关的配置； 接收端设备进行符号同步；
接收端设备进行帧同步；
接收端设备进行均衡器收敛；
发送端设备在接收端设备完成均衡器收敛之后按照目标波道带宽对应的符 号率发送第三微波帧到接收端设备， 所述第三微波帧的帧头指示下一帧为正常 帧并且下一帧的符号率为目标波道带宽对应的符号率， 所述第三微波帧的净荷 部分携带随机符号；
接收端设备完成第三微波帧的处理之后进行符号率为目标波道带宽对应的 符号率的正常帧的接收配置；
发送端设备停止緩存待发送的业务数据；
发送端设备按照目标波道带宽对应的符号率发送第四微波帧到接收端设 备， 所述第四微波帧的帧头指示下一帧为正常帧并且下一帧的符号率为目标波 道带宽对应的符号率， 所述第四微波帧的净荷部分携带业务符号， 从而完成波 道带宽的切换。
2、根据权利要求 1所述的方法， 其特征在于， 发送端设备緩存待发送的业 务数据之前还包括：
发送端设备按照初始波道带宽对应的符号率发送第五微波帧到接收端设 备， 所述第五微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率为初始波 道带宽对应的符号率， 所述第五微波帧的净荷部分携带业务符号；
接收端设备完成第五微波帧的处理之后进行符号率为初始波道带宽对应的 符号率的过渡帧的接收配置。
3、根据权利要求 2所述的方法， 其特征在于， 发送端设备发送第五微波帧 之前还包括：
发送端设备的中频模块接收来自接收端设备的信号质量信息并转发所述信 号质量信息到发送端设备的业务复接模块；
发送端设备的业务复接模块将所述信号质量信息发送到发送端设备的自适 应调制模式及波道带宽发送模块；
发送端设备的自适应调制模式及波道带宽发送模块根据所述信号质量信息 判断是否需要进行波道带宽切换， 如果需要， 则发送切换请求到发送端设备的 业务复接模块。
4、根据权利要求 3所述的方法， 其特征在于， 发送端设备的中频模块接收 来自接收端设备的信号质量信息之前还包括：
接收端设备的中频模块将信号质量信息反馈给接收端设备的自适应调制模 式及波道带宽接收模块；
接收端设备的自适应调制模式及波道带宽接收模块通知接收端设备的业务 复接模块发送所述信号质量信息到发送端设备。
5、根据权利要求 1所述的方法， 其特征在于， 所述发送端设备在接收端设 备完成均衡器收敛之后按照目标波道带宽对应的符号率发送第三微波帧到接收 端设备具体包括：
发送端设备在所述第二微波帧的发送数量达到预设值之后按照目标波道带 宽对应的符号率发送第三微波帧到接收端设备； 或者
发送端设备设置定时器并在定时器到时之后按照目标波道带宽对应的符号 率发送第三微波帧到接收端设备。
6、 一种自适应波道带宽切换系统， 其特征在于， 包括发送端设备和接收端 设备， 其中，
所述发送端设备， 用于緩存待发送的业务数据， 按照初始波道带宽对应的 符号率发送第一微波帧到接收端设备， 所述第一微波帧的帧头指示下一帧为过 渡帧并且下一帧的符号率为目标波道带宽对应的符号率， 所述第一微波帧的净 荷部分携带随机符号， 按照目标波道带宽对应的符号率连续发送第二微波帧到 接收端设备， 所述第二微波帧的帧头指示下一帧为过渡帧并且下一帧的符号率 为目标波道带宽对应的符号率， 所述第二微波帧的净荷部分携带随机符号， 在 接收端设备完成均衡器收敛之后按照目标波道带宽对应的符号率发送第三微波 帧到接收端设备， 所述第三微波帧的帧头指示下一帧为正常帧并且下一帧的符 号率为目标波道带宽对应的符号率，所述第三微波帧的净荷部分携带随机符号， 停止緩存待发送的业务数据， 按照目标波道带宽对应的符号率发送第四微波帧 到接收端设备， 所述第四微波帧的帧头指示下一帧为正常帧并且下一帧的符号 率为目标波道带宽对应的符号率， 所述第四微波帧的净荷部分携带业务符号； 所述接收端设备， 用于在完成第一微波帧的处理之后进行符号率为目标波 道带宽对应的符号率的过渡帧的接收配置， 在接收到所述第二微波帧后， 切换 与符号率相关的配置， 进行符号同步， 进行帧同步， 进行均衡器收敛， 在完成 第三微波帧的处理之后进行符号率为目标波道带宽对应的符号率的正常帧的接 收配置。
7、 根据权利要求 6所述的系统， 其特征在于，
所述发送端设备还用于在緩存待发送的业务数据之前按照初始波道带宽对 应的符号率发送第五微波帧到接收端设备， 所述第五微波帧的帧头指示下一帧 为过渡帧并且下一帧的符号率为初始波道带宽对应的符号率， 所述第五微波帧 的净荷部分携带业务符号；
所述接收端设备还用于在完成第五微波帧的处理之后进行符号率为初始波 道带宽对应的符号率的过渡帧的接收配置。
8、 根据权利要求 7所述的系统， 其特征在于，
所述发送端设备还用于在发送第五微波帧之前， 接收来自接收端设备的信 号质量信息并根据所述信号质量信息判断是否需要进行波道带宽切换。
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CN103222218B (zh) 2015-11-25
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