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    • 4. 发明授权
    • Method and apparatus for transmission of asynchronous, synchronous, and
variable length mode protocols multiplexed over a common bytestream
    • 用于传输通过公共字节流复用的异步,同步和可变长度模式协议的方法和装置
    • US5936965A
    • 1999-08-10
    • US874651
    • 1997-06-13
    • Bharat Tarachand DoshiSubrahmanyam DravidaKotikalapudi Sriram
    • Bharat Tarachand DoshiSubrahmanyam DravidaKotikalapudi Sriram
    • H04J3/16H04L12/56H04Q11/04
    • H04J3/1682H04Q11/0478H04J2203/0089H04L2012/5672
    • The specification relates to a system supporting the transmission of multiple protocols over a single bytestream. The multiple protocol types supported include asynchronous transfer mode (ATM) protocol data units (PDUs), synchronous transfer mode (STM) PDUs, and variable length (VL) PDUs, as well as subtypes included within the aforementioned multiple protocol types. PDUs from higher layers are processed at three intermediate protocol layers where application layer PDUs are prepared, segmented, and repacked as asynchronous block multiplexing (ABM) PDUs. ABM PDUs include a type identification field. Cyclical redundancy checks and other error detection/correction techniques are optionally supported. ABM PDUs are multiplexed within a multiple protocol bytestream. Multiple protocol bytestream support is provided between a transmitter and receiver over a plurality of mediums, including but not limited to coaxial cable, wireless, optical fiber, hybrid fiber/coax, satellite, and twisted pair. Despite the various modes, protocols, PDU lengths, and different quality of service (QOS) requirements, support is provided over a common bytestream with a common physical layer datalink in either a point-to-point or broadcast environment.
    • 该规范涉及支持通过单个字节流传输多个协议的系统。 支持的多种协议类型包括异步传输模式(ATM)协议数据单元(PDU),同步传输模式(STM)PDU和可变长度(VL)PDU,以及包括在上述多种协议类型内的子类型。 来自较高层的PDU在三个中间协议层处理,其中应用层PDU被准备,分段和重新包装为异步块复用(ABM)PDU。 ABM PDU包括一个类型识别字段。 可选地支持循环冗余校验和其他错误检测/校正技术。 ABM PDU在多协议字节流内复用。 在多个介质上的发射机和接收机之间提供多协议字节流支持,包括但不限于同轴电缆,无线,光纤,混合光纤/同轴电缆,卫星​​和双绞线。 尽管有各种模式,协议,PDU长度以及不同的服务质量(QOS)要求,但是通过一个公共的字节流与点对点或广播环境中的通用物理层数据链路提供支持。
    • 5. 发明授权
    • Method and apparatus for selectively discarding packets
    • 用于选择性地丢弃分组的方法和装置
    • US06219339B1
    • 2001-04-17
    • US09026830
    • 1998-02-20
    • Bharat Tarachand DoshiKotikalapudi SriramYung-Terng Wang
    • Bharat Tarachand DoshiKotikalapudi SriramYung-Terng Wang
    • H04L1228
    • H04L12/5602H04L47/32
    • In a packet voice system, discarding of a packet is performed as a function of previously discarded packets. In one embodiment, a packet voice system includes an ATM Adaptation Layer Type 2 (AAL2) and Service Specific Convergence Sublayer (SSCS) System. In this system, a transmission buffer stores AAL2 voice packets for transmission, each AAL2 voice packet comprising a sequence number, the values of which range from 0 to n−1, and a source identifier, k. When traffic congestion is detected, the transmitter portion of the SSCS System selectively discards one packet from a source k at the output of the transmission buffer if no packet from source k was dropped in either the last n−1 packets or over a predefined prior interval of time. Another embodiment of the invention discards packets at the input of the transmission buffer.
    • 在分组语音系统中,根据先前丢弃的分组,执行丢弃分组。 在一个实施例中,分组语音系统包括ATM适配层类型2(AAL2)和业务特定会聚子层(SSCS)系统。 在该系统中,发送缓冲器存储用于发送的AAL2语音分组,每个AAL2语音分组包括序列号,其值范围从0到n-1,源标识符k。 当检测到交通拥堵时,如果在最后的n-1个分组中没有丢弃来自源k的分组,或者超过预定的先前间隔,则SSCS系统的发射机部分选择性地丢弃来自发射缓冲器输出端的源k的一个分组 的时间。 本发明的另一实施例在发送缓冲器的输入处丢弃分组。
    • 8. 发明授权
    • Method and apparatus enabling synchronous transfer mode and packet mode
access for multiple services on a broadband communication network
    • 能够在宽带通信网络上实现多个服务的同步传输模式和分组模式接入的方法和装置
    • US5570355A
    • 1996-10-29
    • US340927
    • 1994-11-17
    • James E. DailChia-Chang LiPeter D. MagillKotikalapudi SriramNorman A. Whitaker, Jr.
    • James E. DailChia-Chang LiPeter D. MagillKotikalapudi SriramNorman A. Whitaker, Jr.
    • H04J3/16H04J3/00H04J3/17H04L12/56H04L12/64H04Q11/04
    • H04Q11/0478H04L12/6418H04J2203/0069H04J2203/0089H04L2012/5632H04L2012/5672H04L2012/6421H04L2012/6427H04L2012/644H04L2012/6448H04L2012/6462H04L2012/6486
    • STM traffic, e.g. voice and video telephony (VT), as well as packet mode (e.g. ATM) traffic, e.g. broadcast digital video, interactive television, and data, are transmitted via a multiple access broadband fiber/coaxial cable network. Customer premises equipment (CPE) at stations, and a bandwidth controller, which may be at a head end or central office, with which all stations communicate, work together to adapt to the changing demands of the traffic mix, and efficiently allocate bandwidth to a variety of bursty and isochronous traffic sources. The bandwidth allocation defines two types of time slots, STM and ATM, and divides each frame into two corresponding STM and ATM regions. The boundary between the regions can be changed dynamically. A contention access signaling channel is provided in the STM region, for call control and set-up requests. Within the STM region, the time slots can be of variable length and be allocated on a per call basis; the length of the time slots is proportional to the bandwidth requirement of STM calls. Within the ATM region, the time slots are of fixed length, each capable of accommodating one ATM cell. Further, the fixed length ATM time slots may be reserved for a particular user for the duration of a call, or may be shared through a contention process. At least one contention ATM time slot is always made available for signaling messages related to ATM call control and set-up requests. The downstream time frame is structured in a similar manner, but includes an additional MAP field to transmit to the stations ATM time slot allocation and status information for time slots in the upstream channel.
    • STM业务,例如 语音和视频电话(VT),以及分组模式(例如ATM)业务,例如。 广播数字视频,交互式电视和数据通过多址宽带光纤/同轴电缆网络传输。 站点的客户端设备(CPE)以及可能位于所有站点通信的前端或中心局的带宽控制器,一起工作以适应流量混合的不断变化的需求,并且有效地将带宽分配给 各种突发和同步流量来源。 带宽分配定义了两种类型的时隙STM和ATM,并将每个帧划分为两个对应的STM和ATM区域。 区域之间的边界可以动态变化。 在STM区域中提供争用接入信令信道,用于呼叫控制和建立请求。 在STM区域内,时隙可以是可变长度,并且按每个呼叫分配; 时隙的长度与STM呼叫的带宽要求成比例。 在ATM区域内,时隙是固定长度的,每个时隙可容纳一个ATM信元。 此外,固定长度的ATM时隙可以在呼叫期间为特定用户保留,或者可以通过争用过程共享。 总是使至少一个争用ATM时隙可用于与ATM呼叫控制和建立请求有关的信令消息。 下游时间帧以类似的方式构成,但是包括附加的MAP字段,用于向站中的ATM时隙分配和上行信道中的时隙的状态信息进行发送。
    • 10. 发明授权
    • Dynamic build-out approach for use in packet voice systems
    • 用于分组语音系统的动态构建方法
    • US06282196B1
    • 2001-08-28
    • US08900000
    • 1997-07-24
    • Terry Gregory LyonsKotikalapudi SriramYung-Terng Wang
    • Terry Gregory LyonsKotikalapudi SriramYung-Terng Wang
    • H04L1256
    • H04Q11/0478H04L2012/5656H04L2012/5671H04L2012/5681
    • In a packet voice system, a dynamic build-out delay approach in a receiver during the duration of a call. In particular, the build-out delay is applied at least twice during the duration of the call. In one embodiment, a packet voice system includes an ATM Adaptation Layer Type 2 (AAL-2) and Service Specific Convergence Sublayer (SSCS) System. The receiver portion of the SSCS System recovers AAL-2 packets and plays back the compressed audio to a voice decoding element. In providing playback, the receiver applies the build-out delay at the start of each talk-spurt. The voice decoding element provides an uncompressed audio stream. In another embodiment, the receiver portion of the SSCS System applies the build-out delay at the start of the each talk-spurt as a function of the length of the previous silence interval.
    • 在分组语音系统中,在呼叫期间在接收机中的动态建立延迟方法。 特别地,在呼叫期间,建立延迟至少应用两次。 在一个实施例中,分组语音系统包括ATM适配层类型2(AAL-2)和服务特定会聚子层(SSCS)系统。 SSCS系统的接收器部分恢复AAL-2数据包,并将压缩音频回放到语音解码元素。 在提供播放时,接收机将在每次通话突发开始时应用建立延迟。 语音解码元件提供未压缩音频流。 在另一个实施例中,SSCS系统的接收机部分根据先前的静默间隔的长度,在每个通话突发的开始处施加建立延迟。