WO2007025433A1 - Systeme d'acces a une station de base et methode de transmission de donnees a une station de base - Google Patents

Systeme d'acces a une station de base et methode de transmission de donnees a une station de base Download PDF

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Publication number
WO2007025433A1
WO2007025433A1 PCT/CN2006/001605 CN2006001605W WO2007025433A1 WO 2007025433 A1 WO2007025433 A1 WO 2007025433A1 CN 2006001605 W CN2006001605 W CN 2006001605W WO 2007025433 A1 WO2007025433 A1 WO 2007025433A1
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WO
WIPO (PCT)
Prior art keywords
base station
uplink data
data packet
sequence number
packet
Prior art date
Application number
PCT/CN2006/001605
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English (en)
French (fr)
Inventor
Qiang Hu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP06753121A priority Critical patent/EP1942649B1/en
Publication of WO2007025433A1 publication Critical patent/WO2007025433A1/zh
Priority to US12/039,460 priority patent/US8111699B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Definitions

  • Base station access system and base station data transmission method are Base station access system and base station data transmission method
  • the present invention relates to wireless communication technologies, and in particular, to a base station access and base station data transmission technology. Background technique
  • the bandwidth required for data services is much larger than the bandwidth required for voice services, especially the introduction of HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access).
  • CDMA Code Division Multiple Access
  • the base station type widely used in the existing wireless network is a base station with three sectors, and HSDPA and HSUPA CDMA IX Do ⁇ are introduced.
  • the downlink throughput of the base station can be up to 9 ⁇ , and the uplink throughput is up.
  • the charging of data services is relatively low. In the case of the same traffic, the data service has much lower revenue than the voice service. In this case, if the operator continues to use the E1/T1 with high lease cost to implement the base station. Access and data transmission will seriously affect the profitability of operators.
  • xDSL Digital Subscriber Line
  • xDSL technology has easy access and transmission resources. Rich and low transmission cost.
  • the application of xDSL technology in wireless networks is very extensive. Compared with the access of base stations using E1/T1, the use of xDSL to achieve base station access can significantly reduce the cost of base station access.
  • the VDSL (very high speed Digital Subscriber Line) and the ADSL (Asymmetric Digital Subscriber Line) in the xDSL are mainly used to implement the access of the base station. Description:
  • FIG. 1 is a schematic diagram of a networking structure for implementing base station access by using VDSL in the prior art.
  • the base station is connected to a VDSL Modem (VDSL modem) through an Ethernet cable, and a VDSL Modem and a DSLAM (Digital Subscriber Line Access Multiplexer, The digital subscriber line access multiplexer is connected by a twisted pair cable, and the DSLAM and the BAS (Broadband Access Service) are connected through a fast Ethernet.
  • the BAS sends the service on the DSLAM to the RNC through the IP network. .
  • the transmission rate of VDSL in the uplink direction is up to 1.5 Mbps, and the transmission rate in the downlink direction is up to 12 Mbps.
  • the bandwidth can basically meet the requirements for data transmission when the base station is connected.
  • the effective transmission distance of VDSL is only lkm, and the transmission rate exceeds lkm. The drop is very fast, so VDSL can only be used for access to base stations that are close to each other, and cannot be widely used.
  • FIG. 2 is a schematic diagram of a networking structure for implementing base station access by using ADSL in the prior art.
  • the figure is basically the same as that of FIG. 1, except that the base station is connected to the ADSL Modem through an Ethernet cable, and the ADSL access technology is adopted.
  • ADSL is widely used, and its effective transmission distance can reach 3km, which can be applied to long-distance base station access.
  • the bandwidth of ADSL is too small, the uplink is about 0.5Mbps, and the downlink is about 6Mbps. Therefore, the access of the base station cannot be achieved by using ADSL. Meet the transmission bandwidth requirements of most base stations. Summary of the invention
  • the present invention provides a base station access system and a base station data transmission method, which are used to solve the problem that the base station access in the prior art is only applicable to a base station that is close to the DSLAM when using the VDSL technology, and adopts the ADSL technology.
  • the base station access is implemented, the problem of data transmission bandwidth requirements of most base stations cannot be met.
  • a base station access system includes: a base station, configured to sequentially allocate sequence number identifiers for uplink data packets, and send them in parallel through multiple asymmetric digital subscriber loop (ADSL) links; or receive downlink data packets sent in parallel on multiple ADSL links. Arranged in order and sent to the terminal;
  • ADSL digital subscriber loop
  • the broadband access point receives the uplink data packets sent in parallel and sends them to the base station controller in sequence; or sequentially assigns sequence number identifiers to the downlink data packets, and sends them to multiple ADSL links.
  • the digital subscriber line access multiplexer is connected between the plurality of ADSL links and the base station, receives and forwards the uplink data packets sent by the base station, and transmits the downlink data packets to the base station through multiple ADSL links.
  • the broadband access point specifically includes:
  • the adaptation module is configured to sequentially arrange the uplink data packets sent by the digital subscriber line access multiplexer according to the sequence identifier of the uplink data packet, and sequentially assign the sequence number identifier to the received downlink data packet, and send the sequence data identifier to the digital subscriber line Access multiplexer;
  • a broadband access server configured to send the aligned uplink data packet to the base station controller through the broadband network; and receive the downlink data packet delivered by the base station controller through the broadband network.
  • the adaptation module is disposed within the broadband access server or is a separate entity in the system.
  • the base station is provided with a plurality of Ethernet interfaces corresponding to the ADSL link.
  • the broadband access point is connected to the digital subscriber line access multiplexer via Fast Ethernet.
  • the invention also discloses a base station data transmission method applied to the base station access system of the invention, comprising the steps of:
  • the base station sequentially assigns a sequence number identifier to the uplink data packet, and sends the uplink data packet carrying the sequence number identifier to the digital subscriber line access multiplexer through multiple ADSL links;
  • the digital subscriber line access multiplexer receives the uplink data packet sent by the base station, and forwards the data packet to the broadband access point;
  • the broadband access point sorts the uplink data packet according to the sequence identifier of the uplink data packet, and sends the sorted uplink data packet to the base station controller.
  • the step A specifically includes the steps of:
  • the base station uses the multi-link point-to-point protocol to sequentially assign sequence number identifiers to the uplink data packets;
  • the base station maps the uplink data packet carrying the sequence number identifier in the Ethernet frame, and sends it to the digital subscriber line access multiplexer through multiple ADSL links.
  • Another base station data transmission method disclosed by the present invention includes the steps of:
  • the broadband access point sequentially assigns a sequence number identifier to the downlink data packet, and sends the downlink data packet carrying the sequence number identifier to the digital subscriber line access multiplexer;
  • the digital subscriber line access multiplexer sends the downlink data packet carrying the sequence number identifier to the base station through multiple ADSL links;
  • the base station receives downlink data packets on multiple ADSL links, arranges them in sequence, and sends them to the terminal.
  • the step A specifically includes the steps of:
  • the broadband access point uses the multi-link point-to-point protocol to sequentially assign the sequence number identifier to the downlink data packets sent by the base station controller; the subscriber line accesses the multiplexer.
  • the broadband access point may request the base station to retransmit the corresponding uplink data packet or discard the uplink data packet.
  • the present invention implements bundling of multiple ADSL links by using ML-PPP (Multi-Link Point to Point Protocol), and uses multiple bundled ADSL links to perform base station access, thereby ensuring base stations.
  • ML-PPP Multi-Link Point to Point Protocol
  • the transmission distance of the access is effective at the same time, and the transmission bandwidth of the base station is effectively increased, and can be widely applied to base stations that are far away from the DSLAM and/or have high requirements on the transmission bandwidth.
  • FIG. 1 is a schematic structural diagram of a networking for implementing base station access by using VDSL in the prior art
  • 2 is a schematic structural diagram of a networking for implementing base station access by using ADSL in the prior art
  • FIG. 3 is a schematic structural diagram of a networking of a base station accessing system according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for transmitting uplink data of a base station according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a method for transmitting downlink data of a base station according to Embodiment 3 of the present invention. detailed description
  • the ML-PPP Multi-Link Point to Point Protocol
  • the ML-PPP is used to bundle multiple ADSL links, and the bundled multiple ADSL links are used to access the base station, thereby satisfying the base station.
  • FIG. 3 is a schematic diagram of a network structure of a base station access system according to an embodiment of the present invention.
  • the base station access system of the first embodiment of the present invention includes a base station, a DSLAM, and a broadband access point, where: the base station, according to The ML-PPP protocol sequentially assigns sequence number identifiers to the uplink data packets, sends them through multiple ADSL links, and sequentially arranges downlink data packets on multiple ADSL links, and extracts service data and sends the data to the corresponding terminal.
  • the ML-PPP protocol sequentially assigns sequence number identifiers to the uplink data packets, sends them through multiple ADSL links, and sequentially arranges downlink data packets on multiple ADSL links, and extracts service data and sends the data to the corresponding terminal.
  • the DSLAM is connected to the base station by using multiple ADSL links, and is configured to receive and forward uplink data packets sent by the base station; and send the downlink data packets to the base station through multiple ADSL links;
  • the broadband access point is connected to the DSLAM through the fast Ethernet network, and is used for sequentially arranging the uplink data packets sent by the DSLAM and transmitting them to the base station controller through the broadband network; and sending the received base station controller according to the ML-PPP protocol.
  • the downlink data packets are sequentially assigned sequence number identifiers and sent to the DSLAM.
  • the base station access system of the first embodiment of the present invention sets multiple Ethernet interfaces on the base station, and each Ethernet interface corresponds to one ADSL link.
  • the base station is connected to the ADSL Modem, and the ADSL Modem is connected to the DSLAM.
  • the above broadband access point includes an adaptation module and a broadband access server, wherein:
  • the adaptation module is configured to sequentially arrange the uplink data packets sent by the digital subscriber line access multiplexer according to the sequence identifier of the uplink data packet, and sequentially assign the sequence number identifier to the received downlink data packet according to the ML-PPP protocol, and then Sent to the DSLAM;
  • a broadband access server configured to send the aligned uplink data packet to the base station controller through the broadband network; and receive the downlink data packet delivered by the base station controller through the broadband network.
  • the adaptation module may be configured as a component of the broadband access server in the broadband access server, or may be an independent entity in the base station access system of the first embodiment of the present invention.
  • FIG. 4 is a flowchart of a method for transmitting uplink data of a base station according to Embodiment 2 of the present invention, and the main implementation process is as follows:
  • Step S10 The base station receives the uplink data sent by the terminal, performs baseband processing and radio frequency processing, and obtains a FP (Frame Protocol) frame, which is used as a payload to be transmitted by the transmission network layer, and encapsulates the payload into an IP packet ( Add the IP header), then send it to the PPP layer and encapsulate it into a PPP packet (add the PPP header), and then assign a sequence number identifier to each PPP packet to form an ML-PPP packet according to the ML-PPP protocol;
  • FP Flash Protocol
  • Step S11 The base station maps the ML-PPP packet to the Ethernet frame of the second layer, and carries it to the DSLAM through multiple Ethernet links on the base station.
  • Step S12 The DSLAM receives and aggregates the ML-PPP packets uploaded by the multiple ADSL links, and forwards the aggregated ML-PPP packets to the adaptation module through the fast Ethernet.
  • Step S13 The adaptation module receives the ML-PPP packet sent by the DSLAM, sorts the received ML-PPP packet according to the serial number identifier, removes the serial number identifier of the sorted ML-PPP packet, and removes the PPP header, and restores the IP packet. , then mapping the IP packet to the second layer and sending it to the BAS through the uplink port;
  • the delay jitter of the ML-PPP packets of different links to the adaptation module may be inconsistent.
  • the adaptation module needs to have a certain buffer for the docked ML-PPP packets are scheduled; the size of the cache depends on the network jitter and storage space and the trade-off of the delay requirements. Generally speaking, the delay jitter of the IP network in the industry is on the order of 10ms, so the cache space To be able to tolerate delay jitter of around 10ms.
  • the lost ML-PPP packet has not been received, it will be sorted. After the ML-PPP packet serial number identifier and PPP header are removed, the IP packet is restored, and the IP packet is transmitted to the upper layer, and the upper layer framing the received IP packet and determining whether to discard or resend, if the upper layer It is a TCP (Transfer Control Protocol). If a packet is lost, it will be resent. If the upper layer is UDP (User Datagram Protocol), it does not need to be retransmitted.
  • TCP Transfer Control Protocol
  • Step S14 The BAS sends the uplink IP packet to the base station controller through the broadband IP network.
  • the method for transmitting the uplink data of the base station in the second embodiment of the present invention is exemplified as follows: For example, the base station uses one (1, 2, and 3) Ethernet ports to connect one ADSL Modem, and each ADSL Modem passes through a twisted pair. The line is connected to the DSLAM. When the base station needs to send four uplink data packets, the base station puts four uplink data packets into four different PPP packets, and assigns a serial number identifier to each PPP packet in sequence.
  • the adaptation module sorts the uplink PPP data packets according to the sequence number identifier and forwards them to the base station controller through the IP network.
  • FIG. 5 is a flowchart of a method for transmitting downlink data of a base station according to Embodiment 3 of the present invention, and the main implementation process thereof is as follows:
  • Step S20 The base station controller sends a downlink IP packet to the BAS through the broadband IP network.
  • Step S22 The adaptation module sends the ML-PPP packet to the DSLAM through the Fast Ethernet.
  • Step S23 The DSLAM sends the ML-PPP packet to the base station through multiple ADSL links.
  • the serial number identifier sequentially arranges the ML-PPP packet, and extracts the IP data packet therefrom, and then extracts the FP frame from the IP data packet, and then performs baseband processing such as encoding, modulation, and spreading, and then transmits the data to the antenna through the antenna. terminal.
  • the base station side also needs to have a certain buffer for the data packets to be received.
  • the receiving end receives the ML-PPP packet, if the sequence number appears on the sequence number, it represents The packet loss occurs.
  • the adaptation module first waits for a buffer period. If the lost ML-PPP packet has not been received, the sequence identifier of the sorted ML-PPP packet and the PPP header are removed, and the IP packet is restored. The IP packet is passed to the upper layer, and the upper layer framing the received IP packet and determining whether to discard or retransmit. If the upper layer is the TCP protocol, the lost packet is required to be retransmitted, if the upper layer is UDP. The protocol does not need to be resent and only discards.
  • the present invention implements bundling of multiple ADSL links by using ML-PPP, and uses the bundled multiple ADSL links to perform base station access, thereby effectively improving the transmission distance of the base station access.
  • the transmission bandwidth when the base station is connected can be widely applied to base stations that are far away from the DSLAM and/or have high requirements on the transmission bandwidth.

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  • Computer Networks & Wireless Communication (AREA)
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Description

基站接入系统及基站数据传输方法 技术领域
本发明涉及无线通信技术， 尤其涉及一种基站接入及基站数据传输技术。 背景技术
随着无线网络的发展和建设， 数据业务在无线网络中所占用的分量越来 越重， 所需要的传输带宽也不断提高。 数据业务需要的带宽远远大于语音业 务需要的带宽， 特别在引入 HSDPA ( High Speed Downlink Packet Access , 高 速下行链路分组接入）、 HSUPA ( High Speed Uplink Packet Access, 高速上行 链路分组接入）以及 CDMA ( Code Division Multiple Access, 码分多址接入系 统） IX Do后， 由于能够提供给终端的数据业务传输速率越来越高， 数据业 务的发展也越来越迅速， 使得每个基站的业务量不断增加， 从而导致基站所 需要的传输带宽也越来越大。 在现有无线网络中广泛使用的基站类型为具有 三个扇区的基站， 引入 HSDPA 、 HSUPA CDMA IX Do ^ , 为保证终端的 数据业务传输， 基站的下行吞吐量最高可达 9Μ, 上行吞吐量最高可达 1M, 再加下面各层的开销， 反映到物理层的速率大致为下行方向 15Mbps, 上行方 向 1.5Mbps。 数据业务的收费相对比较低廉， 在相同业务量的情况下， 数据业 务比语音业务的收益要低得多， 在这种情况下， 如果运营商继续使用租用费 用很高的 E1/T1 来实现基站的接入及数据传输， 将会严重影响运营商的盈利 水平。
xDSL (未指明特定状态的 DSL (数字用户环路， Digital Subscriber Line ) ) 是一种利用现有的传统电话线路， 以极高的带宽传输数字信号的技术， xDSL 技术具有接入方便、传输资源丰富、传输成本低廉的优点。 目前 xDSL技术在 无线网络中的应用非常广泛， 与采用 E1/T1实现基站的接入相比， 采用 xDSL 实现基站的接入可显著降低基站接入的成本。 现有技术中主要采用 xDSL 中的 VDSL( Very high speed Digital Subscriber Line, 极高速数字用户环路 )和 ADSL ( Asymmetric Digital Subscriber Line, 非对称数字用户环路）来实现基站的接入， 下面分别予以说明：
图 1所示为现有技术中采用 VDSL实现基站接入的组网结构示意图， 由 图中可见， 基站通过以太网线与 VDSL Modem ( VDSL调制解调器）连接， VDSL Modem与 DSLAM ( Digital Subscriber Line Access Multiplexer, 数字用 户线接入复用器）之间通过双绞线连接， DSLAM与 BAS ( Broadband Access Service, 宽带接入服务器）之间通过快速以太网连接， BAS将 DSLAM上的 业务通过 IP网络发送给 RNC。
VDSL 的上行方向的传输速率可达 1.5Mbps， 下行方向的传输速率可达 12Mbps, 其带宽基本可以满足基站接入时对数据传输的要求， 但是 VDSL的 有效传输距离只有 lkm, 超过 lkm后传输速率下降得非常快， 因此 VDSL只 能用于距离较近的基站的接入， 无法得到广泛的应用。
图 2所示为现有技术中采用 ADSL实现基站接入的组网结构示意图， 该 图和图 1基本相同， 只是基站通过以太网线与 ADSL Modem连接， 并且采用 的是 ADSL接入技术。
ADSL的应用非常广泛， 其有效传输距离可达 3km, 能够适用于远距离 的基站接入， 但是由于 ADSL的带宽太小， 上行 0.5Mbps左右， 下行 6Mbps 左右， 因此采用 ADSL实现基站的接入无法满足大多数基站对传输带宽的要 求。 发明内容
本发明提供了一种基站接入系统及基站数据传输方法， 用以解决现有技 术中采用 VDSL技术实现基站接入时， 仅适用于接入距离 DSLAM较近的基 站的问题， 以及采用 ADSL技术实现基站接入时， 无法满足大多数基站对数 据传输带宽要求的问题。
一种基站接入系统， 包括： 基站， 用于为上行数据包依次分配序号标识， 将其通过多条非对称式数 字用户环路（ADSL )链路并行发送出去； 或者接收多条 ADSL链路上的并行 发送的下行数据包， 按序排列后发送给终端；
宽带接入点， 接收并行发送的上行数据包并按序排列后发送给基站控制 器； 或者为下行数据包依次分配序号标识， 并将其发送给多条 ADSL链路。
还包括：
数字用户线接入复用器， 连接在多条 ADSL链路与基站之间， 用千接收 并转发基站发出的上行数据包， 以及将下行数据包通过多条 ADSL链路发送 给基站。
所述宽带接入点具体包括：
适配模块， 用于根据上行数据包的序号标识按序排列数字用户线接入复 用器发出的上行数据包， 以及为接收到的下行数据包依次分配序号标识， 将 其发送给数字用户线接入复用器；
宽带接入服务器， 用于通过宽带网絡将排列后的上行数据包发送给基站 控制器； 以及接收基站控制器通过宽带网络下发的下行数据包。
所述适配模块设置在所述宽带接入服务器内， 或者为所述系统中的独立 实体。
所述基站上设置有多个与 ADSL链路——对应的以太网接口。
所述宽带接入点通过快速以太网与数字用户线接入复用器连接。
本发明还公开一种应用于本发明所述基站接入系统的基站数据传输方 法， 包括步骤：
A、基站为上行数据包依次分配序号标识， 将携带有序号标识的上行数据 包通过多条 ADSL链路发送给数字用户线接入复用器；
B、 数字用户线接入复用器接收基站发出的上行数据包， 将其转发给宽带 接入点；
C、 宽带接入点根据上行数据包的序号标识对其进行排序， 将排序后的上 行数据包发送给基站控制器。 所述步骤 A具体包括步骤：
基站利用多链路点对点协议为上行数据包依次分配序号标识；
基站将携带有序号标识的上行数据包映射在以太网帧中， 将其通过多条 ADSL链路发送给数字用户线接入复用器。
本发明公开的另一种基站数据传输方法， 包括步骤：
A、 宽带接入点为下行数据包依次分配序号标识， 将携带有序号标识的下 行数据包发送给数字用户线接入复用器；
B、 数字用户线接入复用器将携带有序号标识的下行数据包通过多条 ADSL链路发送给基站；
C、 基站接收多条 ADSL链路上的下行数据包， 按序排列后发送给终端。 所述步驟 A具体包括步骤：
宽带接入点利用多链路点对点协议为基站控制器发出的下行数据包依次 分配序号标识； 用户线接入复用器。
根据所述的基站数据传输方法， 若宽带接入点收到的上行数据包出现了 丢失， 则宽带接入点可以要求基站重发相应的上行数据包， 或者丢弃该上行 数据包。
本发明有益效果如下：
本发明采用 ML-PPP ( Multi-link Point to Point Protocol, 多链路点对点协 议） 实现对多条 ADSL链路的捆绑， 利用捆绑后的多条 ADSL链路进行基站 的接入， 从而在保证基站接入的传输距离的同时有效的提高了基站接入时的 传输带宽， 能够广泛应用于接入距离 DSLAM较远和 /或对传输带宽要求较高 的基站。 附图说明
图 1为现有技术中采用 VDSL实现基站接入的组网结构示意图; 图 2为现有技术中采用 ADSL实现基站接入的组网结构示意图； 图 3为本发明实施例一基站接入系统的组网结构示意图；
图 4为本发明实施例二基站上行数据传输方法的流程图；
图 5为本发明实施例三基站下行数据传输方法的流程图。 具体实施方式
本发明采用 ML-PPP ( Multi-link Point to Point Protocol, 多链路点对点协 议） 实现对多条 ADSL链路的捆绑， 利用捆绑后的多条 ADSL链路进行基站 的接入， 从而满足了基站接入时对数据传输距离及带宽的要求。
下面将结合各个附图对本发明技术方案的主要实现原理、 具体实施方式 及其对应能够达到的有益效果进行详细的阐述。
图 3 所示为本发明实施例一基站接入系统的组网结构示意图， 由图中可 见，本发明实施例一的基站接入系统包括基站、 DSLAM和宽带接入点，其中： 基站， 根据 ML-PPP协议为上行数据包依次分配序号标识， 将其通过多 条 ADSL链路发送出去， 以及按序排列多条 ADSL链路上的下行数据包， 提 取出业务数据发送给对应的终端；
DSLAM, 通过多条 ADSL链路与基站连接， 用于接收并转发基站发出的 上行数据包； 以及将下行数据包通过多条 ADSL链路发送给基站；
宽带接入点， 通过快速以太网络与 DSLAM连接， 用于将 DSLAM发出 的上行数据包按序排列后通过宽带网络发送给基站控制器；以及根据 ML-PPP 协议为接收到的基站控制器发出的下行数据包依次分配序号标识， 将其发送 给 DSLAM。
为了实现基站通过多条 ADSL链 入 DSLAM,本发明实施例一的基站 接入系统在基站上设置了多个以太网接口， 每个以太网接口与一条 ADSL链 路相对应。 在每条 ADSL链路上， 基站与 ADSL Modem连接， ADSL Modem 与 DSLAM连接。
上述宽带接入点中包括适配模块和宽带接入服务器， 其中： 适配模块 , 用于根据上行数据包的序号标识按序排列数字用户线接入复 用器发出的上行数据包， 以及根据 ML-PPP协议为接收到的下行数据包依次 分配序号标识， 将其发送给 DSLAM;
宽带接入服务器， 用于通过宽带网络将排列后的上行数据包发送给基站 控制器； 以及接收基站控制器通过宽带网络下发的下行数据包。
适配模块可以设置在宽带接入服务器内作为宽带接入服务器的一个组成 部分， 也可以为,本发明实施例一的基站接入系统中的一个独立实体。
图 4所示为本发明实施例二基站上行数据传输方法的流程图， 其主要实 现过程如下：
步骤 S 10、基站接收终端发出的上行数据 ,对其进行基带处理及射频处理， 得到 FP ( Frame Protocol )帧， 将其作为传输网络层要传输的净荷， 将此净荷 封装为 IP包（增加 IP包头）， 再将其下发给 PPP层封装为 PPP包（增加 PPP 包头）， 然后根据 ML-PPP协议依次为每个 PPP包分配序号标识构成 ML-PPP 包；
步骤 Sll、基站将 ML-PPP包映射在第二层的以太网帧中，通过基站上的 以太网接口将其承载在多条 ADSL链路中发送给 DSLAM;
步骤 S12、 DSLAM接收多条 ADSL链路上传的 ML-PPP包并对其进行汇 聚， 将汇聚后的 ML-PPP包通过快速以太网转发给适配模块；
步骤 S13、适配模块接收 DSLAM发送的 ML-PPP包，根据其序号标识对 接收到的 ML-PPP包进行排序， 将排序后的 ML-PPP包的序号标识和 PPP包 头去掉， 还原出 IP包， 然后再将 IP包映射到第二层上， 通过上行端口将其发 送给 BAS;
由于采用了多条链路进行 ML-PPP 包的传输， 因此不同链路的 ML-PPP 包到达适配模块的时延抖动有可能不一致， 适配模块需要有一定的緩存， 用 于对接到的 ML-PPP 包进行排续； 緩存的大小取决于网络抖动和存储空间以 及业务对时延要求的一个权衡， 一般来说目前业界的 IP网络的时延抖动都在 10ms量级， 因此緩存的空间要能够容忍 10ms左右的时延抖动。 当适配模块 接收到 ML-PPP 包时， 如果在序号标识上出现了断序， 则代表发生了丢包， 此时适配模块首先等待一个緩存周期， 若还没有收到丢失的 ML-PPP 包， 则 将排序后的 ML-PPP包的序号标识和 PPP包头去掉， 还原出 IP包， 并将 IP 包传递到上层，由上层对收到的 IP包进行组帧并进行是丢弃还是重发的判断， 如果上层是 TCP ( Transfer Control Protocol, 传输控制协议 ), 丟失数据包就会 被要求重发， 如果上层是 UDP ( User Datagram Protocol, 用户数据报协议）， 则不需要重发， 仅做丟弃处理。
步骤 S14、 BAS将上行 IP包通过宽带 IP网络发送给基站控制器。
下面对本发明实施例二的基站上行数据传输方法进行举例说明： 叉如基站通过 3个（ 1号、 2号和 3号）以太网端口各接一个 ADSL Modem, 每个 ADSL Modem各通过一条双绞线接入到 DSLAM上， 当基站需要发送四 个上行数据包时，则基站将四个上行数据包分别放入四个不同的 PPP包里面， 并按序为每个 PPP包分配一个序号标识（N、 N + l、 N + 2和 N + 3 ), 在 1号 以太网口发送序号标识为 N的上行 PPP数据包，在 2号端口发送序号为 N + 1 的上行 PPP数据包， 在 3号端口发送序号为 N + 2的上行 PPP数据包， 接着 重复利用 1号端口发送序号为 N + 3的上行 PPP数据包； DSLAM收到基站发 送的上行 PPP数据包后， 对其进行汇聚后转发给适配模块， 适配模块根据上 行 PPP数据包的序号标识对其进行排序并通过 IP网絡转发给基站控制器。
图 5 所示为本发明实施例三的基站下行数据传输方法的流程图， 其主要 实现过程如下：
步骤 S20、 基站控制器通过宽带 IP网络向 BAS下发下行 IP包； 步骤 S21、 BAS将基站控制器下发的下行 IP包发送给适配模块， 适配模 块将其下发给 PPP层封装为 PPP包 （增加 PPP包头）， 然后根据 ML-PPP协 议依次为每个 PPP包分配序号标识构成 ML-PPP包；
步骤 S22、 适配模块将 ML-PPP包通过快速以太网发送给 DSLAM;
步骤 S23、 DSLAM将 ML-PPP包通过多条 ADSL链路发送给基站； 步骤 S24、 基站接收多条 ADSL链路上的 ML-PPP包， 根据 ML-PPP的 序号标识按序排列 ML-PPP包， 并从中提取出 IP数据包， 然后从 IP数据包里 面提取出 FP帧， 再通过编码、 调制、 扩频等基带处理， 然后通过射频处理， 通过天线发送给终端。
与适配模块一样， 基站侧也同样需要有一定的緩存， 用于对接到的数据 包进行排续， 当接收端收到 ML-PPP的包时， 如果在序号标识上出现了断序， 则代表发生了丢包， 此时适配模块首先等待一个緩存周期， 若还没有收到丢 失的 ML-PPP包， 则将排序后的 ML-PPP包的序号标识和 PPP包头去掉， 还 原出 IP包， 并将 IP包传递到上层， 由上层对收到的 IP包进行组帧并进行是 丟弃还是重发的判断， 如果上层是 TCP协议， 丟失数据包就会被要求重发， 如果上层是 UDP协议， 则不需要重发， 仅做丟弃处理。
综上所述， 本发明采用 ML-PPP实现对多条 ADSL链路的捆绑， 利用捆 绑后的多条 ADSL链路进行基站的接入， 从而在保证基站接入的传输距离的 同时有效的提高了基站接入时的传输带宽，能够广泛应用于接入距离 DSLAM 较远和 /或对传输带宽要求较高的基站。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种基站接入系统， 其特征在于， 包括：
基站， 用于为上行数据包依次分配序号标识， 将其通过多条非对称式数 字用户环路 ADSL链路并行发送出去； 或者接收多条 ADSL链路上的并行发 送的下行数据包， 按序排列后发送给终端；
宽带接入点， 接收并行发送的上行数据包并按序排列后发送给基站控制 器； 或者为下行数据包依次分配序号标识， 并将其发送给多条 ADSL链路。
2、 根据权利要求 1所述的基站接入系统， 其特征在于， 还包括： 数字用户线接入复用器， 连接在多条 ADSL链路与基站之间， 用于接收 并转发基站发出的上行数据包， 以及将下行数据包通过多条 ADSL链路发送 给基站。
3、 根据权利要求 2所述的基站接入系统， 其特征在于， 所述宽带接入点 具体包括：
适配模块， 用于根据上行数据包的序号标识按序排列数字用户线接入复 用器发出的上行数据包， 以及为接收到的下行数据包依次分配序号标识， 将 其发送给数字用户线接入复用器；
宽带接入服务器， 用于通过宽带网络将排列后的上行数据包发送给基站 控制器； 以及接收基站控制器通过宽带网络下发的下行数据包。
4、 根据权利要求 3所述的基站接入系统， 其特征在于， 所述适配模块设 置在所述宽带接入服务器内， 或者为所述系统中的独立实体。
5、 根据权利要求 1所述的基站接入系统， 其特征在于， 所述基站上设置 有多个与 ADSL链路一一对应的以太网接口。
6、 根据权利要求 2所述的基站接入系统， 其特征在于， 所述宽带接入点 通过快速以太网与数字用户线接入复用器连接。
7、 一种基站数据传输方法， 其特征在于， 包括步骤：
A、基站为上行数据包依次分配序号标识， 将携带有序号标识的上行数据 包通过多条 ADSL链路发送给数字用户线接入复用器；
B、数字用户线接入复用器接收基站发出的上行数据包， 将其转发给宽带 接入点；
C、 宽带接入点根据上行数据包的序号标识对其进行排序， 将排序后的上 行数据包发送给基站控制器。
8、 根据权利要求 7所述的基站数据传输方法， 其特征在于， 所述步骤 A 具体包括步骤：
基站利用多链路点对点协议为上行数据包依次分配序号标识；
基站将携带有序号标识的上行数据包映射在以太网帧中， 将其通过多条 ADSL链路发送给数字用户线接入复用器。
9、 根据权利要求 7所述的基站数据传输方法， 其特征在于， 若宽带接入 点收到的上行数据包出现了丢失， 则宽带接入点可以要求基站重发相应的上 行数据包， 或者丢弃该上行数据包。
10、 一种基站数据传输方法， 其特征在于， 包括步骤：
A、 宽带接入点为下行数据包依次分配序号标识， 将携带有序号标识的下 行数据包发送给数字用户线接入复用器；
B、 数字用户线接入复用器将携带有序号标识的下行数据包通过多条 ADSL链路发送给基站；
C、 基站接收多条 ADSL链路上的下行数据包， 按序排列后发送给终端。
11、 根据权利要求 10所述的基站数据传输方法， 其特征在于， 所述步驟 A具体包括步骤：
宽带接入点利用多链路点对点协议为基站控制器发出的下行数据包依次 分配序号标识； 用户线接入复用器。
12、 根据权利要求 10所述的基站数据传输方法， 其特征在于， 若基站收 到的下行数据包发生了丢失， 则基站可以要求宽带接入点重发相应的下行数 据包， 或者丟弃该下行数据包
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US20080170542A1 (en) 2008-07-17
US8111699B2 (en) 2012-02-07

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