WO2003063421A1 - Procede de realisation d'une couche d'adaptation 2 pour trafic en temps reel a debit binaire variable dans un mode de transfert asynchrone atm - Google Patents

Procede de realisation d'une couche d'adaptation 2 pour trafic en temps reel a debit binaire variable dans un mode de transfert asynchrone atm Download PDF

Info

Publication number
WO2003063421A1
WO2003063421A1 PCT/CN2003/000057 CN0300057W WO03063421A1 WO 2003063421 A1 WO2003063421 A1 WO 2003063421A1 CN 0300057 W CN0300057 W CN 0300057W WO 03063421 A1 WO03063421 A1 WO 03063421A1
Authority
WO
WIPO (PCT)
Prior art keywords
buffer
data
layer
cps
packet
Prior art date
Application number
PCT/CN2003/000057
Other languages
English (en)
French (fr)
Inventor
Jibin Ma
Jin Yue
Shikui Guo
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 US10/501,860 priority Critical patent/US20050220118A1/en
Priority to EP03701459A priority patent/EP1471687A4/en
Priority to JP2003563155A priority patent/JP2005516476A/ja
Publication of WO2003063421A1 publication Critical patent/WO2003063421A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
    • H04L2012/5607—Radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
    • H04L2012/5656—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671—Support of voice

Definitions

  • the present invention relates to the field of mobile communications, and in particular to a method for implementing ATM (Asynchronous Transmission Mode) variable bit rate real-time service adaptation layer type 2 in the field of third-generation mobile communications.
  • ATM Asynchronous Transmission Mode
  • AAL2 ATM variable bit rate real-time service adaptation layer type 2
  • AAL2 ATM variable bit rate real-time service adaptation layer type 2
  • the AAL2 protocol is divided into the convergence sublayer CS and the disassembly sublayer SAR. According to the relevance of the service, it is divided into the CS layer SSCS related to the specific service and the public sublayer CPS. Disassembly sublayer SAR. Among them, the SSCS layer is set for specific services, and the CPCS and SAR sublayers are required.
  • the CPS layer SAR protocol processing of the AAL2 protocol is implemented in the existing technology with a dedicated chip.
  • This chip implements the SAR processing process of CPS packet to ATM cell. After SAR processing, it adapts to the ATM cell to complete the AAL2 microcomputer. Channel multiplexing and demultiplexing. CPS packets from different or the same AAL2 users carried in the same PVC (permanent virtual channel permanent channel) are multiplexed into ATM cells through SAR processing, and the receiver performs the opposite process to ATM.
  • the AAL2 WeChat CPS packet carried in the cell is demultiplexed into a single AAL2 user data packet CPS packet after SAR processing.
  • the data format of the CPS packet in the AAL2 protocol is shown in Figure 2.
  • the CPS packet consists of a header CPS-PH and a payload CPS-PP.
  • the CPS-PH includes an 8bit (bit) channel identifier CID (Channel Identifer), 6-bit length indication LI (Length Indication), 5-bit CPS user indication UUI (User-to-User Indication) and CPS packet header protection HEC (Header Error Control).
  • CPS-PP CPS Packet Payload
  • the length is 1 ⁇ 45 or 64 bytes. among them:
  • Channel identifier CID It is used to identify the bidirectional channel of AAL2. The length is 8 bits. The value is not used. 1 is used for communication between layer management entities. 2 to 7 are reserved. 8 to 255 can be used by 3303.
  • Length indication LI indicates the length of the information field CPS-INFO, which occupies 6 bits and ranges from 0 to 63, indicating that the CPS-INFO length is 1 to 64 bytes.
  • the default maximum length of CPS-INF0 is 45 bytes.
  • the maximum length of CPS-INFO must be set by the signaling or management process.
  • Inter-user indication UUI transparently transmits user control information at the CPS layer, which can distinguish different types of CPS users, with a length of 5 bits.
  • CPS packet header error control HEC The CID, LI, and UUI in the CPS-PH are protected by checking.
  • the length is 19 bits.
  • the CPS packet After the CPS packet is processed by the SAR of the CPS layer, it forms a CPS protocol data unit.
  • the CPS-PDU its data format is shown in Figure 3.
  • the CPS-PDU is 48 bytes in length and includes an 8-bit Start Field (STF) and a CPS-PDU payload area. among them:
  • STF Start Field
  • Offset OSF Offset Field: Stores the distance from the end of the STF to the start of the CPS-PH or padding field. 0SF 7 means that no information is loaded in the CPS-PDU payload area. 0SF cannot be greater than 47.
  • Sequence number SN (Sequence Number): lbit, which numbers the CPS-PDU information flow.
  • Odd parity P (Par i ty): lbit, perform odd parity on STF.
  • CPS-PDU load area It can carry 0, 1 or more CPS packets.
  • the padding field PAD is used to fill the unused part to fill the remaining length.
  • One CPS packet may be loaded into the load area of two CPS-PDUs.
  • CPS-PDU passes ATM service access point ATM-SAP becomes ATM business data unit
  • ATM—SDU becomes the ATM cell after adding the cell header at the ATM layer.
  • the AAL2 protocol multiplexing and demultiplexing process and the SAR processing from the CPS layer to the ATM layer implemented using the special chip mentioned above only complete part of this layer processing. It does not implement other layers including the SSSAR layer (disassembly and assembly related to specific services) Layer), the CPCS layer (common convergent sublayer) in the CPS layer, nor does it implement the AAL2 data exchange function at the CPS layer, and cannot implement the AAL2 layer exchange for AAL2 CPS packets at the intermediate node connected by AAL2. Can not meet the needs in practical applications. Summary of the Invention
  • An object of the present invention is to provide a method for performing AAL2 layer data packet exchange and SSSAR protocol processing on CPS packets that have been implemented in the prior art to improve AAL2.
  • the technical solution adopted by the present invention is: A method for implementing ATM variable bit rate real-time service adaptation layer type 2; first, a sending buffer for storing sending data packets and a receiving data for storing Packet receive buffer,
  • the CPS data packet processed by the common sublayer CPS protocol is stored in the receiving buffer of the virtual connection VC, and then according to the virtual path identifier VPI of the VC and the virtual channel identifier in the virtual path Character VCI and the channel identifier CID of the packet Find the corresponding VPI, VCI, and CID values of the sending VC, and exchange the CPS data packet into the sending buffer of the VC to be sent; at the end node of the connection
  • the payload of the CPS data packet processed by the CPS layer protocol after removing the header is stored in the receiving buffer of the VC, and then the buffer data is submitted to the application layer, and is transmitted.
  • the application layer passes the data to be sent to the adaptation layer, and the adaptation layer stores the data in the sending buffer;
  • a connection corresponding to each CID value is allocated a buffer used for the disassembly sublayer SSSAR protocol processing related to a specific service, and the CPS data packet processed by the CPS layer protocol is stored in the VC.
  • the SSSAR layer protocol is reorganized. The reassembled complete data packet is stored in the buffer processed by the SSSAR protocol corresponding to the CID value, and then the relevant data of the VC is submitted to the application layer.
  • the application layer passes the data to be sent to the adaptation layer.
  • the adaptation layer splits the data by the SSSAR protocol, processes it into CPS data packets, and stores them in the sending buffer of the corresponding VC.
  • FIG. 1 is a hierarchical structure diagram of the AAL2 protocol involved in the method of the present invention
  • Figure 2 is a data format diagram of a CPS packet in the AAL2 protocol
  • FIG. 3 is a data format diagram of a CPS protocol data unit; 4 is a schematic diagram of an AAL2 exchange process in a specific embodiment of the present invention; detailed description
  • the method for realizing AAL2 is to first set a sending buffer for storing sent data packets and a receiving buffer for storing received data packets.
  • the foregoing buffer setting is to use the existing technology for the CPS layer.
  • the SAR processing results at the ATM layer perform data interaction with the method of the present invention, and use the above buffer to complete the ATM variable bit rate real-time service adaptation layer type 2 data exchange at the connected switching node, and use the above buffer at the connected terminating node.
  • the ATM variable bit rate real-time service adaptation layer type 2 data exchange is to store the CPS data packet processed by the common sub-layer CPS protocol in the receiving buffer of the virtual connection VC, and then identify it according to the virtual path of the VC.
  • the VPI, the virtual channel identifier VCI in the virtual channel, and the channel identifier CID of the data packet to find the corresponding VPI, VCI, and CID values of the sending VC, and exchange the CPS data packet to the sending buffer of the VC to be sent.
  • connection termination node uses the above buffer to complete the adaptation layer protocol processing and the transfer of data between the adaptation layer and the application layer. It distinguishes between voice data packets and packet data packets. For voice data packets, in the receiving direction, they will pass CPS. Layer protocol processing
  • the payload of the CPS data packet after removing the header is stored in the receiving buffer of the VC, and then the The buffer data is submitted to the application layer.
  • the application layer passes the data to be transmitted to the adaptation layer, and the adaptation layer stores the data in the transmission buffer;
  • a connection corresponding to each CID value is allocated a buffer for processing the disassembly sublayer SSSAR protocol related to a specific service, and the CPS data packet processed by the CPS layer protocol is stored in the buffer.
  • the SSSAR layer protocol reorganization processing is performed.
  • the reassembled complete data packet is stored in the buffer processed by the SSSAR protocol corresponding to the CID value, and then the relevant data of the VC is submitted to the application layer.
  • the application layer passes the data to be sent to the adaptation layer.
  • the adaptation layer splits the data by the SSSAR protocol, processes it into CPS data packets, and stores them in the sending buffer of the corresponding VC.
  • the basis for modifying the CID value during the exchange is based on the CID value in the CPS data packet received by the VC and the VC's index to find the corresponding output VC index and CID value through the exchange routing table, and exchanged through the buffer pointer
  • This method transfers CPS data packets from the receiving buffer to the sending buffer, which simplifies the processing process, reduces the CPU resource occupation, and avoids the operation of a large number of data copies.
  • all the receiving and sending buffers are used. In Apply dynamically when establishing a connection, and release when disconnecting to ensure flexible configuration of the connection.
  • the data exchange at the termination node can also use the buffer pointer exchange method.
  • the method must be applied for and released continuously.
  • the buffer pointer exchange method can also be adopted. Logically speaking, the exchanged buffers are different. Physically, the buffers may be the same.
  • the implementation of the present invention is:
  • the operation of submitting the buffer data to the application layer is to submit the pointer of the receiving buffer and the CPI of the VC's VPI, VCI, and CPS data packets to the application layer, and then A pointer to an empty buffer is returned from the application layer to the adaptation layer and stored in the receive buffer queue.
  • the application layer passes the data to be sent to the adaptation layer and stores the data in the transmission buffer.
  • the operation is to pass the buffer pointer that stores the data to be sent and the corresponding VPI, VCI and CID to the adaptation layer.
  • the adaptation layer stores the buffer pointer in the buffer queue and replaces the sending buffer queue. An empty buffer in the and pass its pointer back to the application layer.
  • the length of the voice data packet is generally only 20 to 30 bytes.
  • the SSSAR sublayer in the AAL2 protocol can be used for transparent transmission. That is, when sending, the pointer of the data buffer to be sent is directly obtained from the upper layer of AAL2 and exchanged to a send buffer. Area pointer, fill in the header, and send.
  • the operation of submitting the SSSAR buffer data to the application layer is to submit the VC's VPI, VCI, the pointer of the SSSAR buffer, and the CID of the CPS data packet to the application layer. Then return an empty buffer from the application layer
  • the pointer to the adaptation layer is stored in the SSSAR buffer queue.
  • the application layer passes the data to be sent to the adaptation layer and stores the data in the sending buffer. The operation is to store the data to be sent.
  • the buffer pointer and the corresponding VPI, VCI, and CID parameters are passed to the adaptation layer.
  • the adaptation layer splits the data in the buffer by the SSSAR protocol, processes it into CPS packets, and stores it in the VC's sending buffer. And return the pointer of the send buffer of the application layer to the application layer.
  • the packet length of the packet service carried by AAL2 is usually large, usually between several hundred and several kilobytes.
  • the SSSAR sublayer of AAL2 needs to be split and recombined. .
  • When sending first copy the upper-layer data into the sending buffer, fill in the header, and then send.
  • the received data is stored in multiple receiving buffers. The received data is first copied to a fixed data buffer in sequence.
  • the packet service data packets of these users are formed into many CPS data packets after SSSAR split processing at the sending end. After these data packets arrive at the receiving end, different CI D data packets may cross over, as long as each CPS data packet All are copied into different buffers according to different CIDs, and SSSAR reorganization can ensure correctness.
  • the size of the buffer used for voice and packet service processing and the buffer used to split and reorganize the upper layer data are all the same.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

一种 ATM变比特率实时业务适配层类型 2的实现方法 技术领域
本发明涉及移动通信领域， 尤其涉及第三代移动通信领域中 ATM (异步传输模式） 变比特率实时业务适配层类型 2的实现方法。 背景技术
在第三代移动通信产品中， 基本的业务处理均通过 ATM承载， 语 音和数据业务按照协议都通过 AAL2 ( ATM变比特率实时业务适配层类 型 2 )承载， 它的协议分层结构如图 1所示。 AAL2协议分为会聚子层 CS 和拆装子层 SAR， 按照与业务的相关性又分为与特定业务有关的 CS层 SSCS和公共子层 CPS,公共子层 CPS包括公共部分会聚子层 CPCS和拆装 子层 SAR。 其中， SSCS层是为特定业务而设的， 而 CPCS和 SAR子层是必 须的。 目前， AAL2协议的 CPS层 SAR协议处理在现有技术中有专用芯片 来实现， 该芯片实现了 CPS分组到 ATM信元的 SAR处理过程， 经过 SAR 处理与 ATM信元进行适配， 完成 AAL2微通道的复用和解复用。 承载在 同一条 PVC (永久虚信道 permanent vir tua l channel ) 中的来自不同 或相同的 AAL2用户的 CPS分组经过 SAR处理复用到 ATM信元中， 在接收 方又进行相反的处理过程，将 ATM信元中承载的 AAL2微信元 CPS分组经 过 SAR处理解复用为单个 AAL2用户数据包 CPS分组。 AAL2协议中的 CPS 分组的数据格式如图 2所示， CPS分组由头部 CPS- PH和负载 CPS-PP两部 分组成， CPS- PH包括 8bi t (比特） 的信道标识符 CID (Channel Identifer) , 6bit 长度指示 LI (Length Indication)、 5bitCPS用户 间指示 UUI (User- to- User Indication) 和 CPS分组头部保护 HEC (Header Error Control)。 CPS负载 CPS-PP (CPS Packet Payload) 长度为 1~45或 64字节。 其中：
(1)信道标识符 CID: 用来标识 AAL2的双向信道， 长度为 8bit, 取 值 0不用， 1用于层管理实体间的通信， 2~7保留， 8~ 255可以被3303 使用。
(2)长度指示 LI:表示信息域 CPS- INFO的长度，占用 6bit，取值 0~ 63, 表示 CPS- INFO长度为 1~ 64字节， 默认 CPS-INF0的最大长度为 45 字节。 CPS-INFO的最大长度必须由信令或管理过程设定。
(3)用户间指示 UUI: 在 CPS层透明传输用户控制信息， 可区分不 同类型的 CPS用户， 长度 5bit。
(4) CPS分组头部差错控制 HEC: 通过校验保护 CPS- PH中的 CID、 LI 和 UUI， 长度 19bit。
CPS分组经过 CPS层的 SAR处理之后， 形成 CPS协议数据单元
CPS-PDU, 其数据格式如图 3所示。 CPS-PDU长度为 48字节， 包括 8bit 开始域 STF(Start Field)和 CPS-PDU负载区。 其中：
(1)偏移量 OSF (Offset Field): 存放 STF结束位置到 CPS-PH或填 充字段 PAD开始的距离。 0SF 7表示在 CPS-PDU负载区没有信息装载 , 0SF不能大于 47。
(2)序列编号 SN (Sequence Number)： lbit, 对 CPS-PDU信息流进 行编号。 (3)奇校验 P (Par i ty) : lbi t , 对 STF进行奇校验。
(4) CPS- PDU负载区： 可装载 0个、 1个或多个 CPS分组。 填充字段 PAD用于填充未被使用的部分以补足剩余长度，一个 CPS分组可能被装 载到两个 CPS-PDU的负载区中去。
CPS-PDU经过 ATM业务访问点 ATM― SAP即成为 ATM业务数据单元
ATM— SDU, ATM— SDU在 ATM层加上信元头后成为 ATM信元。
上述使用专用芯片实现的 AAL2协议复用解复用过程和 CPS层到 ATM层的 SAR处理， 仅完成这一层的部分处理， 没有实现其他各层包 括 SSSAR层（与特定业务有关的拆装子层）、 CPS层中的 CPCS层（公 共部分会聚子层） 的处理， 也没有实现 AAL2数据在 CPS层的交换功 能， 无法实现在 AAL2连接的中间节点对于 AAL2的 CPS包进行 AAL2 层的交换， 不能满足实际应用中的需要。 发明内容
本发明的目的在于提供一种针对现有技术已实现的 CPS 分组进 行 AAL2层数据包交换和 SSSAR协议处理以完善 AAL2的方法。
为达到上述目的， 本发明采用的技术方案是： 一种 ATM变比特率 实时业务适配层类型 2的实现方法， 首先，设置用于存放发送数据包 的发送緩沖区， 和用于存放接收数据包的接收緩冲区，
在连接的交换节点，将经过公共子层 CPS协议处理后的 CPS数据 包存放在该虚连接 VC的接收緩冲区中，然后根据该 VC的虚通路标识 符 VPI、 虚通路中的虚通道标识符 VCI和该数据包的信道标识符 CID 查找所对应的发送 VC的 VPI、 VCI和 CID值， 将该 CPS数据包交换到 要发送的 VC的发送緩冲区中； 在连接的终结节点
对于语音数据包， 在接收方向， 将经过 CPS 层协议处理所得的 CPS数据包去掉包头后的净荷存放在该 VC的接收緩冲区中， 然后将 该緩沖区数据提交给应用层， 在发送方向， 应用层将要发送的数据传 递给适配层， 适配层将数据存放在发送緩冲区中；
对于分组数据包， 在接收方向， 为每个 CID值对应的连接分配用 于与特定业务有关的拆装子层 SSSAR协议处理的緩沖区， 将经过 CPS 层协议处理的 CPS数据包存放在该 VC的接收緩冲区中，再进行 SSSAR 层协议重组处理，重组的完整数据包存放在该 CID值对应的 SSSAR协 议处理的緩冲区中， 然后将该 VC的相关数据提交给应用层； 在发送 方向，应用层将要发送的数据传递给适配层，适配层对数据进行 SSSAR 协议的拆分， 处理成 CPS数据包， 存放在相应 VC的发送缓冲区中。
采用上述方法后，通过设置緩冲区，并利用缓冲区进行交换处理， 使 AAL2层间交换得以实现， 并确立了 SSSAR子层对语音数据包透明 传输而对分组数据包进行拆分重组的解决方法， 进一步完善了 AAL2 协议层的实现方案。 附图说明
图 1 是本发明方法所涉及的 AAL2协议分层结构图；
图 2 是 AAL2协议中的 CPS分组的数据格式图；
图 3 是 CPS协议数据单元的数据格式图； 图 4 是本发明具体实施方式中 AAL2交换处理过程示意图； 示意图。 具体实施方式
本发明实现 AAL2的方法， 是首先设置用于存放发送数据包的发 送緩冲区， 和用于存放接收数据包的接收緩冲区， 上述緩沖区设置是 为了将现有技术中用于 CPS层到 ATM层 SAR处理结果与本发明方法进 行数据交互，在连接的交换节点利用上述緩冲区完成 ATM变比特率实 时业务适配层类型 2数据的交换，在连接的终结节点利用上述緩冲区 完成适配层协议处理和适配层与应用层数据的传递；连接的交换节点 指 AAL2各子层间节点， 连接的终结节点指 AAL2与应用层、 ATM层间 的节点。
ATM变比特率实时业务适配层类型 2数据的交换是将经过公共子 层 CPS协议处理后的 CPS数据包存放在该虚连接 VC的接收緩沖区中， 然后才艮据该 VC的虚通路标识符 VPI、 虚通路中的虚通道标识符 VCI 和该数据包的信道标识符 CID查找所对应的发送 VC的 VPI、 VCI和 CID值， 将该 CPS数据包交换到要发送的 VC的发送緩沖区中；
在连接的终结节点利用上述緩冲区完成适配层协议处理和适配 层与应用层数据的传递是对语音数据包和分组数据包区别处理： 对于语音数据包， 在接收方向， 将经过 CPS 层协议处理所得的
CPS数据包去掉包头后的净荷存放在该 VC的接收緩冲区中， 然后将 该緩沖区数据提交给应用层， 在发送方向， 应用层将要发送的数据传 递给适配层， 适配层将数据存放在发送緩冲区中；
对于分组数据包， 在接收方向， 为每个 CID值对应的连接分配用 于与特定业务有关的拆装子层 SSSAR协议处理的緩冲区， 将经过 CPS 层协议处理的 CPS数据包存放在该 VC的接收缓冲区中，再进行 SSSAR 层协议重组处理，重组的完整数据包存放在该 CID值对应的 SSSAR协 议处理的缓沖区中， 然后将该 VC的相关数据提交给应用层； 在发送 方向，应用层将要发送的数据传递给适配层，适配层对数据进行 SSSAR 协议的拆分， 处理成 CPS数据包， 存放在相应 VC的发送緩冲区中。
将一个緩冲区的内容交换到另一个緩冲区，在传统方法中通常要 经过数据的拷贝。在本发明的具体实施中， 我们设置用于指向各緩冲 区的緩冲区指针， 并将缓冲区指针存放于緩冲区队列中， 且每条 vc 分别有自己的接收缓冲区队列和发送緩冲区队列。 在此基础上， 可如 图 4所示， ATM变比特率实时业务适配层类型 2数据的交换过程中将 CPS数据包从接收緩沖区交换到要发送緩沖区的操作是： 将该 CPS数 据包的 CID值修改成查找到的发送 CID值，对存放接收到的 CPS数据 包的緩沖区和发送 VC的一个空的緩沖区的相应指针进行互换。 交换 的过程中修改 CID值的依据是根据 VC接收到的 CPS数据包中的 CID 值和该 VC 的索引通过交换路由表查找到对应输出的 VC 索引和 CID 值，而通过緩冲区指针交换的方式将 CPS数据包从接收緩沖区转移到 发送緩冲区中， 简化了处理过程， 并减少 CPU资源的占有率， 避免大 量数据拷贝的操作， 对于每条 vc, 所有接收和发送緩沖区都采用在 建立连接时动态申请， 在拆除连接时释放的方式， 以保证连接的灵活 配置。
在终结节点的数据交换，如适配层数据提交给应用层或应用层数 据传递给适配层的操作亦可采用緩冲区指针交换的方式，然而通常方 法在实施中要不断申请和释放緩冲区或者数据拷贝，在终结节点的协 议处理中， 为完成适配层和上层的数据交换， 亦可采用緩冲区指针交 换的方式， 从逻辑上讲， 互换的緩冲区是不同的， 在物理上， 緩冲区 可能是同一个， 本发明的实施方式为：
对于终结节点的语音数据包， 在接收方向， 将緩冲区数据提交给 应用层的操作是将接收緩冲区的指针和该 VC的 VPI、 VCI及 CPS数据 包的 CID提交给应用层，然后从应用层回传一个空緩冲区的指针给适 配层， 存放在接收緩冲区队列中； 在发送方向， 应用层将要发送的数 据传递给适配层并将数据存放在发送緩沖区中的操作是将存放要发 送的数据的緩冲区指针及相应的 VPI、 VCI和 CID传递给适配层， 适 配层将緩沖区的指针存放在緩冲区队列中，替换出发送緩沖区队列中 的一个空緩沖区， 并将其指针回传给应用层。语音数据包的长度一般 只有 20到 30字节， 在 AAL2协议中的 SSSAR子层可作透明传输， 即 在发送时直接从 AAL2的上层获取要发送数据緩冲区的指针， 交换给 一个发送緩沖区指针， 并填写包头， 然后发送。
对于终结节点的分组数据包， 在接收方向， 将 SSSAR緩沖区数据 提交给应用层的操作是将该 VC的 VPI、 VCI、 该 SSSAR緩冲区的指针 及 CPS数据包的 CID提交给应用层，然后从应用层回传一个空緩沖区 的指针给适配层， 存放在 SSSAR缓冲区队列中； 在发送方向， 应用层 将要发送的数据传递给适配层并将数据存放在发送緩冲区中的操作 是将存放要发送的数据的缓冲区指针及相应的 VPI、 VCI和 CID等参 数传递给适配层， 适配层对緩冲区中的数据进行 SSSAR协议的拆分， 处理成 CPS数据包， 存放在 VC的发送緩冲区中， 并将应用层的发送 緩冲区指针回传给应用层。 如图 5所示， AAL2承载的分组业务， 其 数据包的长度通常较大，一般在几百至几千字节之间，对于这种业务， 需要 AAL2的 SSSAR子层进行拆分和重组处理。 发送时先将上层数据 分段拷贝到发送緩冲区中， 填写包头， 然后发送。 接收到长包时， 接 收到的数据存放在多个接收緩沖区中，先将接收到的数据依次拷贝到 一个固定的数据緩冲区中， 由于承载于同一条 VC 中的 AAL2用户的 C ID不同， 这些用户的分组业务数据包在发送端经过 SSSAR拆分处理 之后， 形成很多 CPS数据包， 这些数据包到达接收端后， 不同 CI D的 数据包可能会交叉出现，只要每个 CPS数据包都按不同 CID区分拷贝 到不同的緩冲区中， SSSAR重组即可保证正确性。
为了使应用层实现简单，用于语音和分组业务处理的緩冲区和用 于拆分重组存放上层数据的緩冲区的大小全部相同。

Claims

权 利 要 求
1、 一种 ATM变比特率实时业务适配层类型 2的实现方法， 其特 征在于： 设置用于存放发送数据包的发送緩冲区， 和用于存放接收数 据包的接收緩沖区，
在连接的交换节点，将经过公共子层 CPS协议处理后的 CPS数据 包存放在该虚连接 VC的接收緩冲区中，然后根据该 VC的虚通路标识 符 VPI、 虚通路中的虚通道标识符 VCI和该数据包的信道标识符 CID 查找所对应的发送 VC的 VPI、 VC I和 CID值， 将该 CPS数据包交换到 要发送的 VC的发送緩冲区中； 在连接的终结节点
对于语音数据包， 在接收方向， 将经过 CPS 层协议处理所得的
CPS数据包去掉包头后的净荷存放在该 VC的接收緩冲区中， 然后将 该緩冲区数据提交给应用层， 在发送方向， 应用层将要发送的数据传 递给适配层， 适配层将数据存放在发送緩冲区中；
对于分组数据包，在接收方向， 为每个 CID值对应的连接分配用 于与特定业务有关的拆装子层 SSSAR协议处理的緩冲区， 将经过 CPS 层协议处理的 CPS数据包存放在该 VC的接收缓沖区中，再进行 SSSAR 层协议重组处理，重组的完整数据包存放在该 CID值对应的 SSSAR协 议处理的緩冲区中， 然后将该 VC的相关数据提交给应用层； 在发送 方向，应用层将要发送的数据传递给适配层，适配层对数据进行 SSSAR 协议的拆分， 处理成 CPS数据包， 存放在相应 VC的发送緩冲区中。
2、 如权利要求 1所述的 ATM变比特率实时业务适配层类型 2的 实现方法， 其特征在于： 设置用于指向各緩冲区的緩冲区指针， 并将 緩沖区指针存放于緩沖区队列中， 且每条 vc分别有自己的接收緩冲 区队列和发送緩沖区队列。
3、 如权利要求 2所述的 ATM变比特率实时业务适配层类型 1的 实现方法， 其特征在于： 在 ATM变比特率实时业务适配层类型 2数据 的交换过程中将 CPS 数据包从接收緩沖区交换到发送緩沖区的操作 将该 CPS数据包的 CID值修改成查找到的发送 CID值，对存放接 收到的 CPS数据包的緩沖区和发送 VC的一个空緩沖区的相应指针进 行互换。
4、 如权利要求 1所述的 ATM变比特率实时业务适配层类型 1的 实现方法， 其特征在于： 对于终结节点的语音数据包， 在接收方向， 将緩沖区数据提交给应用层的操作是将接收緩冲区的指针和该 VC的 VPI、 VCI及 CPS数据包的 CID提交给应用层， 然后从应用层回传一 个空緩冲区的指针给适配层，存放在接收緩沖区队列中；在发送方向， 应用层将要发送的数据传递给适配层并将数据存放在发送緩冲区中 的操作是将存放要发送的数据的緩冲区指针及相应的 VPI、VCI和 CID 传递给适配层， 适配层将緩冲区的指针存放在缓冲区队列中， 从发送 緩沖区队列中替换出一个空缓冲区， 并将其指针回传给应用层。
5、 如权利要求 2所述的 ATM变比特率实时业务适配层类型 2的 实现方法， 其特征在于： 对于终结节点的分组数据包， 在接收方向， 将 SSSAR緩冲区数据提交给应用层的操作是将该 VC的 VPI、 VCI、 该 SSSAR緩沖区的指针及 CPS数据包的 CID提交给应用层， 然后从应用 层回传一个空缓沖区的指针给适配层， 存放在 SSSAR缓沖区队列中； 在发送方向，应用层将要发送的数据传递给适配层并将数据存放在发 送緩冲区中的操作是将存放要发送的数据的緩冲区指针及相应的 VPI、 VCI和 CID等参数传递给适配层， 适配层对緩冲区中的数据进 行 SSSAR协议的拆分， 处理成 CPS数据包， 存放在 VC的发送缓冲区 中， 并将应用层的发送緩冲区指针回传给应用层。
6、 如权利要求 1或 2所述的 ATM变比特率实时业务适配层类型 2的实现方法， 其特征在于： 所述緩冲区大小均相同。
PCT/CN2003/000057 2002-01-23 2003-01-23 Procede de realisation d'une couche d'adaptation 2 pour trafic en temps reel a debit binaire variable dans un mode de transfert asynchrone atm WO2003063421A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/501,860 US20050220118A1 (en) 2002-01-23 2003-01-23 Method for realize the atm variable bit rate real-time traffic
EP03701459A EP1471687A4 (en) 2002-01-23 2003-01-23 METHOD FOR THE REALIZATION OF ATM-REAL-TIME TRAFFIC WITH VARIABLE BITRATE
JP2003563155A JP2005516476A (ja) 2002-01-23 2003-01-23 可変ビットレートリアルタイムサービス用のａｔｍアダプテーションレイヤ２の実装方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN02100757.8 2002-01-23
CNB021007578A CN1168247C (zh) 2002-01-23 2002-01-23 一种atm变比特率实时业务适配层类型2的实现方法

Publications (1)

Publication Number Publication Date
WO2003063421A1 true WO2003063421A1 (fr) 2003-07-31

Family

ID=27587809

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2003/000057 WO2003063421A1 (fr) 2002-01-23 2003-01-23 Procede de realisation d'une couche d'adaptation 2 pour trafic en temps reel a debit binaire variable dans un mode de transfert asynchrone atm

Country Status (5)

Country Link
US (1) US20050220118A1 (zh)
EP (1) EP1471687A4 (zh)
JP (1) JP2005516476A (zh)
CN (1) CN1168247C (zh)
WO (1) WO2003063421A1 (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100466596C (zh) * 2004-06-27 2009-03-04 华为技术有限公司 实现联合使用定时器功能的系统及其方法
EP1764980B8 (en) * 2005-09-20 2009-01-07 Panasonic Corporation Method and apparatus for packet segmentation and concatenation signaling in a communication system
US10193655B2 (en) * 2008-01-15 2019-01-29 Futurewei Technologies, Inc. Method and apparatus for scheduling multimedia streams over a wireless broadcast channel
US8005102B2 (en) * 2008-03-31 2011-08-23 Futurewei Technologies, Inc. System and method for scheduling variable bit rate (VBR) streams in a wireless communications system
CN106549869A (zh) * 2015-09-21 2017-03-29 北京信威通信技术股份有限公司 数据包处理方法及装置
CN111629279B (zh) * 2020-04-13 2021-04-16 北京创享苑科技文化有限公司 一种基于定长格式的视频数据传输方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999065250A2 (en) * 1998-06-05 1999-12-16 Nokia Networks Oy Synchronization of atm-based network system using variable bit rate atm adaptation layer protocols
WO2000062493A1 (en) * 1999-04-09 2000-10-19 General Datacomm, Inc. Method and apparatus for generation of atm aal2 type broadband setup message from narrowband setup request
CN1279876A (zh) * 1997-09-24 2001-01-10 艾利森电话股份有限公司 利用异步传输模式第二适配层有效地传输互联网协议数据包

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2944531B2 (ja) * 1996-09-12 1999-09-06 日本電気通信システム株式会社 Ｌａｎ間接続装置
WO1998029987A1 (fr) * 1996-12-26 1998-07-09 Ntt Mobile Communications Network Inc. Procede de transmission de donnees
GB2322515A (en) * 1997-02-21 1998-08-26 Northern Telecom Ltd Adaptation layer switching
JP2000332781A (ja) * 1999-05-19 2000-11-30 Hitachi Ltd 可変長パケットスイッチ
KR100379379B1 (ko) * 1999-09-13 2003-04-10 엘지전자 주식회사 이동 통신 시스템에서 ａａｌ－２/ａａｌ－５ 처리 장치
ATE256374T1 (de) * 1999-11-12 2003-12-15 Cit Alcatel Überlastregelung einer aal2-verbindung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1279876A (zh) * 1997-09-24 2001-01-10 艾利森电话股份有限公司 利用异步传输模式第二适配层有效地传输互联网协议数据包
WO1999065250A2 (en) * 1998-06-05 1999-12-16 Nokia Networks Oy Synchronization of atm-based network system using variable bit rate atm adaptation layer protocols
WO2000062493A1 (en) * 1999-04-09 2000-10-19 General Datacomm, Inc. Method and apparatus for generation of atm aal2 type broadband setup message from narrowband setup request

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1471687A4 *

Also Published As

Publication number Publication date
JP2005516476A (ja) 2005-06-02
EP1471687A1 (en) 2004-10-27
CN1434592A (zh) 2003-08-06
CN1168247C (zh) 2004-09-22
US20050220118A1 (en) 2005-10-06
EP1471687A4 (en) 2005-11-09

Similar Documents

Publication Publication Date Title
JP2990345B2 (ja) ネットワークインターフェース
JP3210906B2 (ja) Ａｔｍ通信網とそのインバースマルチプレクス方法
US5889778A (en) ATM layer device
US5917828A (en) ATM reassembly controller and method
US6961340B2 (en) AAL2 receiver for filtering signaling/management packets in an ATM system
EP1131923A4 (en) MULTI-PROTOCOL CONVERSION SUPPORT SYSTEM AND METHOD FOR NETWORK ACCELERATOR
KR20040062396A (ko) 이더넷과 비동기 전송 방식 인터페이스 사이의 단일 및다중 채널 변환기/브리지와 조작 방법
US6810424B2 (en) Link layer device and method of translating packets between transport protocols
JP2000503495A (ja) 電気通信システム
US6931012B2 (en) ATM processor for switching in an ATM system
US7269175B2 (en) AAL2 transmitter for voice-packed and signaling management-packed interleaving on an ATM connection
WO2003063421A1 (fr) Procede de realisation d'une couche d'adaptation 2 pour trafic en temps reel a debit binaire variable dans un mode de transfert asynchrone atm
WO1995014269A1 (en) A high-performance host interface for networks carrying connectionless traffic
KR100364747B1 (ko) Ａａｌ2/ａａｌ5 변환 장치 및 방법
US6915360B2 (en) Cell buffering system with priority cache in an ATM system
JPH07221762A (ja) パケット処理方法および通信インターフェイス装置
KR100384996B1 (ko) 비동기 전송모드 셀 스위칭 기능을 이용한 패킷 교환기 구조 및 그 처리방법
US6603768B1 (en) Multi-protocol conversion assistance method and system for a network accelerator
JPH1065713A (ja) Ａｔｍシステム用セル検出方法
JPH10313325A (ja) セル取捨て方法
KR0123227B1 (ko) Aal계층의 송신 인터페이스장치
KR0129183B1 (ko) Sscop부계층의 pdu생성회로
JP3439378B2 (ja) 通信方法とその通信システム
KR0129178B1 (ko) Sscop부계층의 pdu생성회로
AU703403B2 (en) Method and apparatus for asynchronous transfer mode (ATM) network

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2003701459

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2003563155

Country of ref document: JP

WWP Wipo information: published in national office

Ref document number: 2003701459

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 10501860

Country of ref document: US

WWW Wipo information: withdrawn in national office

Ref document number: 2003701459

Country of ref document: EP