WO2012167550A1 - 一种处理优先级协定时隙信号的方法和装置 - Google Patents

一种处理优先级协定时隙信号的方法和装置 Download PDF

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Publication number
WO2012167550A1
WO2012167550A1 PCT/CN2011/082194 CN2011082194W WO2012167550A1 WO 2012167550 A1 WO2012167550 A1 WO 2012167550A1 CN 2011082194 W CN2011082194 W CN 2011082194W WO 2012167550 A1 WO2012167550 A1 WO 2012167550A1
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Prior art keywords
priority
signal
contention
time slot
time
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PCT/CN2011/082194
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English (en)
French (fr)
Inventor
张利
徐贵今
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华为技术有限公司
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Priority to CN201180002588.9A priority Critical patent/CN102725988B/zh
Priority to PCT/CN2011/082194 priority patent/WO2012167550A1/zh
Publication of WO2012167550A1 publication Critical patent/WO2012167550A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]

Definitions

  • the present invention relates to the field of communication technologies, and more particularly to a method and apparatus for processing a priority agreement time slot signal. Background of the invention
  • the traditional cable TV network adopts the transmission structure of one-way broadcasting.
  • the two-way transformation of the cable TV network and the integration of the three networks are inevitable development trends in the future.
  • the two-way transformation of the cable TV network mainly adopts the low-frequency EoC (Ethernet Over Coax) technology, and the Ethernet data is transmitted through the coaxial cable after being modulated and demodulated, and the main technical standards are as follows: Homeplug AV (HomePlug Powerl ine All iance, Home Powerline Network Alliance), HomePNA (Home Phonel ine Network All iance), HINOC (High Performance Network Over Coax), WiFi over Coax (same Axis frequency reduction WiFi), MoCA (Multi-media over Coax All iance, coaxial cable multimedia alliance), etc., the State Administration of Radio, Film and Television selected Homeplug AV as the low frequency EoC standard.
  • EoC technology standards are derived from home network technology.
  • the main transmission medium involved in the standard is not a coaxial cable. Therefore, some functional modules need to be adjusted when the technology is applied to a coaxial network system.
  • the development of triple play has put forward higher requirements on the QoS (Quality of Service) of multiple services in the communication network.
  • the QoS of the network service includes performance parameters such as transmission bandwidth, delay, jitter and packet loss rate. .
  • the network transmission equipment must support technical division, priority classification, and service-level agreement (SLA) to ensure the QoS of various services during converged transmission.
  • SLA service-level agreement
  • the EoC technology such as Homeplug AV and HomePNA uses the Carrier Sense Multiple Access (CSMA) protocol for MAC (Media Access Control) layer transmission.
  • CSMA Carrier Sense Multiple Access
  • MAC Media Access Control
  • Each terminal uses a random access channel in a competitive manner.
  • the QoS of various services introduces a priority contention access mode in the MAC protocol.
  • Each terminal passes the priority negotiation. The terminal with the highest priority service transmission task will have the opportunity to randomly contend for the access channel. Other low priority. The terminal will be backed up to ensure the transmission quality of high priority services.
  • the priority contention is completed in two time slots of PRS0 and PRS1, and the devices participating in the priority competition are completed by transmitting a specific signal waveform in the corresponding PRS (Priority Resolution Slot), and others are not at that time.
  • PRS Primary Resolution Slot
  • the terminal participating in the competition will suspend the priority competition of the subsequent time slots and the MPDU (MAC protocol data unit) transmission competition.
  • MPDU MAC protocol data unit
  • Embodiments of the present invention provide a method and apparatus for processing a priority agreement time slot signal, which can solve the problem of signal isolation between some terminals in the priority contention process, resulting in a priority contention signal not being broadcast.
  • One aspect of the present invention provides a method of processing a priority agreement time slot signal, the method comprising:
  • the head end determines a start time of the priority agreement time slot, the priority agreement time slot includes a priority agreement time slot 0 and a priority agreement time slot 1;
  • Another aspect of the present invention provides an apparatus for processing a priority agreement time slot signal, the apparatus comprising:
  • a time determining module configured to determine a start time of a priority agreement time slot, where the priority agreement time slot includes a priority agreement time slot 0 and a priority agreement time slot 1;
  • a priority determining module configured to determine whether priority contention needs to be initiated in the priority agreement time slot
  • a signal processing module configured to receive, during the priority agreement time slot, a priority contention signal sent by a terminal participating in the priority contention, to process the priority contention signal, when the priority contention is not required to be initiated A reflected signal is generated, and the reflected signal is reflected and broadcasted to other terminals, so that the other terminals perform priority monitoring.
  • the head end determines the start time of the priority agreement time slot; when the priority contention does not need to be initiated, the participation priority is received in the priority agreement time slot.
  • the priority contention signal sent by the contention terminal is processed, the priority contention signal is processed to generate a reflection signal, and the reflected signal is reflected and broadcasted to other terminals, so that other terminals perform priority monitoring.
  • the head end broadcasts the PRS signal to other terminals through the reflection mode, and solves the problem.
  • the network topology in the EoC system provides signal isolation between some terminals, ensuring normal broadcast of priority contention signals.
  • FIG. 1 is a flowchart of a method for processing a priority agreement time slot signal according to an embodiment of the present invention
  • FIG. 2 is an application scenario diagram of a method for processing a priority agreement slot signal according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for transmitting a PRS signal to a terminal by using a reflection mode at a head end according to an embodiment of the present invention
  • FIG. 4 is a structural diagram of a PRS signal transmitted by a head end to a terminal by using a reflection mode according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an apparatus for processing a priority agreement time slot signal according to an embodiment of the present invention.
  • Embodiments of the present invention provide a method for processing a priority agreement slot signal.
  • the device and system fully consider the structural characteristics of the coaxial network, and at the same time utilize the characteristics that the PRS priority contention signal is composed of multiple repetition sequences, and the EoC head end detects, amplifies and reflects the terminal transmission at the priority competition moment.
  • the PRS signal is used to implement the broadcast of the PRS signal to all terminals, which solves the technical problem that the prioritized contention signal cannot be broadcast due to signal isolation between some terminals in the existing EoC system.
  • an embodiment of the present invention provides a method for processing a priority agreement time slot signal, where the method includes: 101.
  • a head end determines a start time of a priority agreement time slot; and the priority agreement time slot includes Priority agreement slot 0 and priority agreement slot 1; 102. Determine whether priority contention needs to be initiated in the priority agreement time slot;
  • priority contention When priority contention is not required, receiving, in the priority agreement time slot, a priority contention signal sent by a terminal participating in the priority contention, processing the priority contention signal to generate a reflected signal, The reflected signal is reflected and broadcast to other terminals, so that the other terminals perform priority monitoring.
  • the method in the embodiment of the present invention may further include the step 104: when the priority contention needs to be initiated, the direct transmission priority contention signal is broadcast to other terminals.
  • the head end of step 101 determines a start time of the priority agreement time slot, and further includes:
  • the head end maintains the VCS Timer by reading the RTS (Request To Send) frame, the CTS (Clear To Send) frame, and the header information of the SOF (Start Of Frame).
  • the timing of the carrier sense timer, the virtual carrier sense timer, and the start time t of the priority agreement slot is aligned with the terminal by the virtual carrier sense timer. So that the headend and all terminals can be synchronized to the PRS slot.
  • the head end of step 103 receives the priority contention signal sent by the terminal participating in the priority contention, including:
  • the priority agreement slot includes PRS0 and PRS1, and the priority contention signal 301 sent by the terminal 1 participating in the priority contention includes the signals S1-S6 of the PRS0 and the signal S1- of the PRS1.
  • S6; t The time is the starting time of PRS0, the head end receives the priority contention signal sent by the terminal at time ⁇ ; the time t 2 is the ending time of PRS1, and the priority contention signal received by the head end is as shown by 302, ⁇ time t 2 to time priority contention terminal 1 receives the transmitted signal.
  • the reflected signal received by the terminal 2 receives the reflected signal of the head end reflection broadcast from the time t lj t 2 as indicated by 303.
  • the signals of PRS0 and PRS1 are respectively composed of 6 repeated Sub-Symbol sequences, each sub-symbol 512 sampling points, the duration is 5.12us, and the fixed sequence is produced in the frequency domain, which has good anti-multipath. characteristic.
  • the total length of the PRS slot is 35.84us, and the first and last Sub-Symbols have roll-off.
  • the step 103 is processed by the head end to process the priority contention signal to generate a reflected signal, which may be implemented by: sampling and receiving the priority contention signal to obtain a sampling signal, and relaying the sampling signal. Amplify to generate a reflected signal.
  • the specific process of generating the reflected signal can be seen in FIG. 4, and the head end receives the PRS signal sent by at least one terminal that initiates priority contention at the time of passing through the ADC (Analog-to-Digital Converter). ) after sampling the signal after signal conversion between the PRS and the time t 2 received in addition to the normal receiving process, but also to the repeater is obtained by sampling the reflected signal is obtained, for compensating for initiating priority contention
  • the terminal-to-head line attenuation; the obtained reflected signal enters the digital-to-analog converter and is sent out by a Programmable Gain Amplifier (PGA). This way, it does not affect the normal reception, and the head end does not need to be transmitted.
  • PGA Programmable Gain Amplifier
  • the signal is reflected, and the time for detecting the two symbols can be saved.
  • the switches are opened in PRS0 and PRS1 to align the start time of the PRS slot according to the VCS Timer, so that the head end and all terminals can be synchronized to the PRS slot.
  • the front end of the step 103 processes the priority contention signal to generate a reflected signal, and can also be implemented in another manner:
  • the head end After receiving the PRS signal sent by the terminal at the time of the ⁇ , the head end converts the PRS signal received between the times t ⁇ nt 2 through the analog-to-digital converter, and performs sampling and receiving;
  • the head end regenerates the reflected signal reflection broadcast to other terminals for the sampling signal obtained after the PRS signal received between the time t ⁇ nt 2 .
  • yi are related sliding operation values; x (i) is the sampling point of the ADC; y (i) is the value of the correlation sliding operation; N is the number of points of one sampling period; n is the nth sampling point;
  • the basis for determining whether the PRS is detected specifically includes:
  • Yo (n ) is greater than a predetermined average power threshold
  • Yi ( n ) is greater than a predetermined power, the power being a predetermined percentage relative to y.
  • the average power threshold of (n), that is, a threshold power is predefined, which is in accordance with y.
  • the percentage of (n) is set, such as 80% and so on.
  • the method for prioritizing a slot signal according to the present invention passes the signal in PRS0 and PRS 1 when it is determined that the head end does not need to initiate priority contention in the current PRS.
  • the received priority agreement time slot signal sent by the terminal is broadcasted to other terminals, which can solve the problem of signal isolation brought by the network topology to the terminal device, so that the terminal priority competition signal can be broadcast normally, and the existing solution is solved.
  • a technical problem in the EoC system that the priority contention signal cannot be broadcast due to signal isolation between some terminals.
  • the technical solution of the embodiment of the present invention does not need to change the planning mode of the existing PRS, thereby reducing the waste of channel bandwidth.
  • the embodiment of the present invention further provides an apparatus for processing a priority agreement time slot signal, where the apparatus includes: a time determining module 51, configured to determine a start time of a priority agreement time slot, where the priority The level agreement slot includes priority agreement slot 0 and priority agreement slot 1;
  • a priority determining module 52 configured to determine whether priority contention needs to be initiated in the priority agreement time slot
  • the signal processing module 53 is configured to: when the priority contention does not need to be initiated, receive a priority contention signal sent by the terminal participating in the priority contention in the priority agreement time slot, and process the priority contention signal to generate The reflected signal is reflected and broadcasted to other terminals for other terminals to perform priority monitoring.
  • the signal processing module 53 includes:
  • a signal receiving unit 531 configured to receive, according to a time t ⁇ nt 2 , a priority contention signal sent by a terminal participating in priority contention, where the time instant is between the start time and the time t 2 , The time t 2 is the end time of the priority agreement time slot; the reflected signal unit 532 is configured to sample and receive the priority contention signal to obtain a sampling signal, and perform relay amplification on the sampling signal to generate a reflection. Signal; or,
  • the signal processing module 53 is further configured to:
  • the direct transmission priority contention signal is broadcast to other terminals.
  • the determining a start time of a priority agreement time slot includes:
  • the head end maintains the timing of the virtual carrier sense timer by reading the request data transmission frame, clearing the data transmission frame, and the frame header information of the start frame, and aligning the priority agreement time slot with the terminal through the virtual carrier sense timer The starting moment.
  • the embodiment of the present invention is an apparatus embodiment according to the method embodiment shown in FIG. 1 to FIG. 4, wherein the technical solution involved in the embodiment of the present invention and the method embodiment shown in FIG. 1 to FIG.
  • the technical solution involved in the embodiment of the present invention and the method embodiment shown in FIG. 1 to FIG.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

本发明公开了一种处理优先级协定时隙信号的方法和装置，该方法包括：头端确定优先级协定时隙的起始时刻；确定是否需要在所述优先级协定时隙发起优先级争用；当不需要发起优先级争用时，在优先级协定时隙，接收参与优先级争用的终端发送的优先级争用信号，对优先级争用信号进行处理生成反射信号，将所述反射信号反射广播给其他终端，以便其他终端进行优先级监听。本发明技术方案的实现，解决了以太网同轴传输系统中，部分终端之间由于信号隔离而导致优先级竞争信号无法广播的问题。

Description

一种处理优先级协定时隙信号的方法和装置
技术领域
本发明涉及通信技术领域， 更具体的说， 涉及一种处理优先级协定时隙信号的方法和装置。 发明背景
传统的有线电视网络采用的是单向广播的传输结构， 有线电视网络的双向化改造、 三网融合是 今后必然的发展趋势。 目前有线电视网络双向改造主要采用低频 EoC (Ethernet Over Coax, 以太 网同轴传输） 技术， 将以太网数据经过调制解调等处理后通过同轴电缆传输， 其主要技术标准有以 下几类： Homeplug AV ( HomePlug Powerl ine All iance , 家庭电力线网络联盟）、 HomePNA ( Home Phonel ine Network All iance,家庭电话线网络联盟）、 HINOC (High performance Network Over Coax, 高性能同轴网络）、 WiFi over Coax (同轴降频 WiFi )、 MoCA (Multi-media over Coax All iance, 同轴电缆多媒体联盟） 等， 国家广电总局选定 Homeplug AV为低频 EoC标准。
多数 EoC技术标准源自于家庭网络技术， 其标准所涉及的主要传输媒质并不是同轴线缆， 因此在 将该技术应用到同轴网络系统中时需要对部分功能模块进行调整。
三网融合的发展对通信网络中多种业务承载的 QoS (Qual ity of Service, 服务质量） 提出了更 高的要求， 网络业务的 QoS包括传输带宽、 时延、 抖动以及丢包率等性能参数。 网络传输设备必须支 持业务区分、 优先级分类、 SLA ( Service-Level Agreement, 服务等级协议） 保证等技术手段来保 证各种业务融合传输时的 QoS。
Homeplug AV、 HomePNA等 EoC技术在 MAC (Media Access Control , 媒体接入控制） 层传输采用 CSMA (Carrier Sense Multiple Access, 载波侦听多路访问） 协议， 各个终端采用竞争方式随机接 入信道， 为了保证各种业务的 QoS， 在 MAC协议引入了优先级竞争接入的方式， 各个终端通过优先级 协商， 具有最高优先级业务传输任务的一类终端将有机会随机竞争接入信道， 其它低优先级的终端 将进行退避， 以保证高优先级业务的传输质量。
优先级的争用在 PRS0和 PRS1两个时隙中完成， 参与优先级竞争的设备通过在相应的 PRS (Priority Resolution Slot, 优先级协定时隙） 发送特定信号波形来完成， 其它未在该时隙参与 竞争的终端在信道上探测到有 PRS信号后， 将挂起后续时隙的优先级竞争以及 MPDU (MAC protocol data unit, MAC协议数据单元） 传输竞争。 通过竞争所有设备了解到当前竞争的最高优先级， 只有 最高优先级的设备才有参与传输竞争的资格， 其它低优先级的设备应推迟传输。
在实现本发明过程中， 发明人发现现有技术中至少存在如下问题：
Homeplug AV, HomePNA等 EoC技术定义在共享信道上实现， 在 Cable的树形网络结构中， 在国 家标准 GYT137-1999中要求分配器的隔离度要大于 22dB， 因此 EoC各终端经过多级分配后会导致相 互之间信号隔离， 从而引发了 PRS优先级竞争的问题， 因此现有技术中存在 EoC系统中由于部分终 端之间信号隔离而导致优先级竞争信号无法广播的问题。
发明内容 本发明的实施例提供了一种处理优先级协定时隙信号的方法和装置， 在优先级争用过程中能够 解决部分终端之间信号隔离而导致优先级竞争信号无法广播的问题。
本发明一方面提出一种处理优先级协定时隙信号的方法， 该方法包括：
头端确定优先级协定时隙的起始时刻，所述优先级协定时隙包括优先级协定时隙 0和优先级协定 时隙 1 ;
确定是否需要在所述优先级协定时隙发起优先级争用；
当不需要发起优先级争用时， 在所述优先级协定时隙， 接收参与优先级争用的终端发送的优先 级争用信号， 对所述优先级争用信号进行处理生成反射信号， 将所述反射信号反射广播给其他终端， 以便所述其他终端进行优先级监听。
本发明另一方面提出一种处理优先级协定时隙信号的装置， 该装置包括：
时间确定模块， 用于确定优先级协定时隙的起始时刻， 所述优先级协定时隙包括优先级协定时 隙 0和优先级协定时隙 1 ;
优先级判定模块， 用于确定是否需要在所述优先级协定时隙发起优先级争用；
信号处理模块， 用于在不需要发起优先级争用时， 在所述优先级协定时隙， 接收参与优先级争 用的终端发送的优先级争用信号， 对所述优先级争用信号进行处理生成反射信号， 将所述反射信号 反射广播给其他终端， 以便所述其他终端进行优先级监听。
由上述本发明的实施例提供的技术方案可以看出， 头端通过确定优先级协定时隙的起始时刻； 当不需要发起优先级争用时， 在该优先级协定时隙， 接收参与优先级争用的终端发送的优先级争用 信号， 对优先级争用信号进行处理生成反射信号， 将反射信号反射广播给其他终端， 以便其他终端 进行优先级监听。 本发明技术方案的实现， 头端通过反射方式来广播 PRS信号给其他终端， 解决了
EoC系统中网络拓扑给部分终端之间带来的信号隔离问题， 保证了优先级竞争信号的正常广播。 附图简要说明
图 1为本发明实施例一种处理优先级协定时隙信号的方法流程图；
图 2为本发明实施例一种处理优先级协定时隙信号的方法的应用场景图；
图 3为本发明实施例头端采用反射方式向终端发送 PRS信号的流程图；
图 4为本发明实施例头端采用反射方式向终端发送 PRS信号的结构图；
图 5为本发明实施例一种处理优先级协定时隙信号的装置结构示意图。
实施本发明的方式
本发明实施例提出一种处理优先级协定时隙信号的方法。 装置及系统， 充分考虑了同轴网络的 结构特点， 同时利用了 PRS优先级争用信号是由多个重复序列组成的特点， 通过 EoC头端在优先级竞 争时刻探测、 放大并反射终端发送的 PRS信号的方式， 来实现 PRS信号对所有终端的广播， 解决了现 有 EoC系统中由于部分终端之间信号隔离导致优先级竞争信号无法广播的技术问题。
如图 1所示， 本发明实施例提供一种处理优先级协定时隙信号的方法， 该方法包括： 101、 头端确定优先级协定时隙的起始时刻； 所述优先级协定时隙包括优先级协定时隙 0和优先 级协定时隙 1 ; 102、 确定是否需要在优先级协定时隙发起优先级争用；
103、 当不需要发起优先级争用时， 在所述优先级协定时隙， 接收参与优先级争用的终端发送的 优先级争用信号， 对所述优先级争用信号进行处理生成反射信号， 将所述反射信号反射广播给其他 终端， 以便所述其他终端进行优先级监听。
如图 2所示， 本发明实施例所述方法还可以包括步骤 104: 当需要发起优先级争用时， 直接发射 优先级争用信号广播给其他终端。
具体的， 步骤 101头端确定优先级协定时隙的起始时刻， 进一步包括：
头端通过读取 RTS (Request To Send, 请求数据发送） 帧、 CTS (Clear To Send, 清除数据发 送）帧以及 SOF (Start Of Frame, 起始帧） 的帧头信息， 来维护 VCS Timer ( virtual carrier sense timer, 虚拟载波监听定时器）的定时， 并通过所述虚拟载波监听定时器与终端对齐优先级协定时隙 的起始时刻 t。， 使得头端以及所有终端可以同步于 PRS时隙。
具体的， 步骤 103头端接收参与优先级争用的终端发送的优先级争用信号， 包括：
头端在 t^nt2时刻之间接收参与优先级争用的终端发送的优先级争用信号， 所述 时刻位于所述 起始时刻和所述 t2时刻之间， 所述 t2时刻为所述优先级协定时隙的终止时刻。
进一步的说， 如图 3所示， 优先级协定时隙包括 PRS0和 PRS1 , 参与优先级争用的终端 1发送的优 先级争用信号 301包括 PRS0的信号 S1-S6和 PRS1的信号 S 1-S6; t。时刻为 PRS0的起始时刻， 头端在 ^时 刻接收到所述终端发送的优先级争用信号； t2时刻为 PRS1的终止时刻， 头端接收的优先级争用信号 如 302所示， 从^时刻到 t2时刻接收终端 1发送的优先级争用信号。 终端 2接收的反射信号如 303所示， 从 t lj t2时刻接收到头端反射广播的反射信号。 其中， PRS0和 PRS1的信号都分别由 6个重复的 Sub-Symbol序列组成， 每个 sub-symbol 512个采样点， 时长为 5. 12us， 在频域生产固定序列， 具有 很好的抗多径特性。 PRS slot总长为 35. 84us， 第一个和最后一个的 Sub-Symbol均有滚降。
具体的， 步骤 103头端对所述优先级争用信号进行处理生成反射信号， 可以通过如下方式实现： 对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进行中继放大生成反射信 号。
进一步的说， 反射信号生成的具体过程可以参见图 4， 头端在 ^时刻接收到发起优先级争用的 至少一个终端发送的 PRS 信号， 通过 ADC (Analog-to-Digital Converter, 模数转换器）对在 和 t2时刻之间接收到的所述 PRS信号转换之后除正常的接收处理外， 还要将采样获得的采样信号进 行中继放大后获得反射信号， 用于补偿发起优先级争用的终端到头端的线路衰减； 获得的反射信号 进入数模转换器转换后， 经程控增益放大器 （Programmable Gain Ampl ifier, PGA) 发送出去， 通 过这种方式不会对正常接收造成影响， 头端不需要进行 PRS检测就反射信号， 可以节省两个检测符 号的时间。 此外， 本发明实施例中可以通过设置开关的方式， 在 PRS0和 PRS1打开开关来根据 VCS Timer对齐 PRS时隙的起始时刻， 使得头端以及所有终端可以同步于 PRS时隙。
具体的， 步骤 103头端对所述优先级争用信号进行处理生成反射信号， 还可以通过另一种方式实 现：
对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进行滑动相关运算生成反 射信号。
进一步的说， 头端在 ^时刻接收到终端发送的 PRS信号后， 通过模数转换器对在 t^nt2时刻之间 接收到的所述 PRS信号转换后， 进行采样接收；
对采样获得的采样信号进行滑动相关运算， 在确定探测到 PRS信号后， 头端针对在 t^nt2时刻之 间接收的 PRS信号处理后获得的采样信号， 重新生成反射信号反射广播给其他终端。
进一步具体的， 在本发明实施例中对模数转换后的 PRS信号进行滑动相关运算的方法具体包括： yo (n) =∑ (^ - 0 * - 0 = y0 - 1) + x2 (n) - x2 (n - N) y1 (n) = ^ x{n - i) * x(n - i - N) = γχ {η - \) + x(n)x(n - N) - x(n - N)x(n - 2N) 其中， y。和 yi是相关滑动运算值； x (i) 是 ADC的采样点； y (i) 是相关滑动运算的值； N是一个采 样周期的点数； n是第 n个采样点；
此外， 本发明实施例中确定是否探测到 PRS的依据， 具体包括：
yo (n ) 大于一个预定的平均功率阈值；
yi ( n )大于一个预定功率， 该功率为一个预定的百分比相对于 y。 (n ) 的平均功率阈值， 也就是 说， 预先定义一个阈值功率， 该阈值功率按照 y。(n)的百分比来设定， 比如 80%等等。
从上述本发明实施例的技术方案可以看出，本发明提出的一种优先级协定时隙信号的方法，在确 定头端不需要在当前 PRS发起优先级争用时， 在 PRS0和 PRS 1通过信号反射的方式， 将接收到的终端发 送的优先级协定时隙信号反射广播给其他终端， 能够解决网络拓扑带给终端设备的信号隔离问题， 使得终端优先级竞争信号能够正常广播，解决了现有 EoC系统中由于部分终端之间信号隔离导致优先 级竞争信号无法广播的技术问题。此外，由于本发明实施例的技术方案不用改变现有 PRS的规划方式， 减少了对信道带宽的浪费。
如图 5所示， 本发明实施例还提出了一种处理优先级协定时隙信号的装置， 该装置包括： 时间确定模块 51， 用于确定优先级协定时隙的起始时刻， 所述优先级协定时隙包括优先级协定 时隙 0和优先级协定时隙 1 ;
优先级判定模块 52， 用于确定是否需要在所述优先级协定时隙发起优先级争用；
信号处理模块 53， 用于在不需要发起优先级争用时， 在优先级协定时隙， 接收参与优先级争用 的终端发送的优先级争用信号， 对所述优先级争用信号进行处理生成反射信号， 将所述反射信号反 射广播给其他终端， 以便其他终端进行优先级监听。
在本发明的一个可选实施例中， 所述信号处理模块 53包括：
信号接收单元 531， 用于在 t^nt2时刻之间接收参与优先级争用的终端发送的优先级争用信号， 所述 ^时刻位于所述起始时刻和所述 t2时刻之间， 所述 t2时刻为所述优先级协定时隙的终止时刻； 反射信号单元 532， 用于对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进 行中继放大生成反射信号； 或者，
用于对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进行滑动相关运算生 成反射信号。
在本发明的一个可选实施例中， 所述信号处理模块 53还用于：
当需要发起优先级争用时， 直接发射优先级争用信号广播给其他终端。
在本发明的一个可选实施例中， 所述确定优先级协定时隙的起始时刻， 包括：
头端通过读取请求数据发送帧、 清除数据发送帧以及起始帧的帧头信息， 来维护虚拟载波监听 定时器的定时， 并通过所述虚拟载波监听定时器与终端对齐优先级协定时隙的起始时刻。
需要说明的是， 本发明实施例是基于图 1-图 4所述方法实施例提出的装置实施例， 其中， 本发明 实施例中涉及的技术方案与图 1-图 4所述方法实施例中的技术方案存在对应关系， 因此， 本实施例中 涉及的具体方案可以参见图 1-图 4所述的方法实施例中的相关描述， 在此不做赘述。
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流程， 是可以通过计算机程 序来指令相关的硬件来完成， 所述的程序可存储于一计算机可读取存储介质中， 该程序在执行时， 可包括如上述各方法的实施例的流程。 其中， 所述的存储介质可为磁碟、 光盘、 只读存储记忆体 (Read-Only Memory, ROM) 或随机存储记忆体 (Random Access Memory, RAM) 等。

Claims

权利要求
1. 一种处理优先级协定时隙信号的方法， 其特征在于， 包括：
头端确定优先级协定时隙的起始时刻，所述优先级协定时隙包括优先级协定时隙 0和优先级协定 时隙 1 ;
确定是否需要在所述优先级协定时隙发起优先级争用；
当不需要发起优先级争用时， 在所述优先级协定时隙， 接收参与优先级争用的终端发送的优先 级争用信号， 对所述优先级争用信号进行处理生成反射信号， 将所述反射信号反射广播给其他终端， 以便所述其他终端进行优先级监听。
2. 根据权利要求 1所述的方法， 其特征在于， 所述接收参与优先级争用的终端发送的优先级争 用信号， 包括：
在 t^nt2时刻之间接收参与优先级争用的终端发送的优先级争用信号， 所述 时刻位于所述起始 时刻和所述 t2时刻之间， 所述 t2时刻为所述优先级协定时隙的终止时刻。
3. 根据权利要求 1所述的方法， 其特征在于， 所述对所述优先级争用信号进行处理生成反射信 号， 包括：
对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进行中继放大生成反射信 号。
4. 根据权利要求 1所述的方法， 其特征在于， 所述对所述优先级争用信号进行处理生成反射信 号， 包括：
对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进行滑动相关运算生成反 射信号。
5. 根据权利要求 1一 4任一所述的方法， 其特征在于， 进一步包括：
当需要发起优先级争用时， 直接发射优先级争用信号广播给其他终端。
6.根据权利要求 1一 5任一所述的方法，其特征在于，所述头端确定优先级协定时隙的起始时刻， 包括：
头端通过读取请求数据发送帧、 清除数据发送帧以及起始帧的帧头信息， 来维护虚拟载波监听 定时器的定时， 并通过所述虚拟载波监听定时器与终端对齐优先级协定时隙的起始时刻。
7. 一种处理优先级协定时隙信号的装置， 其特征在于， 包括：
时间确定模块， 用于确定优先级协定时隙的起始时刻， 所述优先级协定时隙包括优先级协定时 隙 0和优先级协定时隙 1 ;
优先级判定模块， 用于确定是否需要在所述优先级协定时隙发起优先级争用；
信号处理模块， 用于在不需要发起优先级争用时， 在所述优先级协定时隙， 接收参与优先级争 用的终端发送的优先级争用信号， 对所述优先级争用信号进行处理生成反射信号， 将所述反射信号 反射广播给其他终端， 以便所述其他终端进行优先级监听。
8、 根据权利要求 7所述的装置， 其特征在于， 所述信号处理模块包括： 信号接收单元， 用于在 ^和 t2时刻之间接收参与优先级争用的终端发送的优先级争用信号， 所 述 ^时刻位于所述起始时刻和所述 t2时刻之间， 所述 t2时刻为所述优先级协定时隙的终止时刻； 反射信号单元， 用于对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进行 中继放大生成反射信号； 或者，
用于对所述优先级争用信号进行采样接收获得采样信号， 对所述采样信号进行滑动相关运算生 成反射信号。
9. 根据权利要求 7或 8所述的装置， 其特征在于， 所述信号处理模块还用于：
当需要发起优先级争用时， 直接发射优先级争用信号广播给其他终端。
10. 根据权利要求 7— 9任一所述的装置， 其特征在于， 所述确定优先级协定时隙的起始时刻， 包括：
通过读取请求数据发送帧、 清除数据发送帧以及起始帧的帧头信息， 来维护虚拟载波监听定时 器的定时， 并通过所述虚拟载波监听定时器与终端对齐优先级协定时隙的起始时刻。
PCT/CN2011/082194 2011-11-15 2011-11-15 一种处理优先级协定时隙信号的方法和装置 WO2012167550A1 (zh)

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