公开(公告)号：US20040252678A1

公开(公告)日：2004-12-16

申请号：US10879558

申请日：2004-06-29

Applicant: BROADCOM CORPORATION

Inventor： Theodore F. Rabenko ,  James C. H. Thi ,  John D. Horton JR.

IPC: H04L012/66

CPC classification number: H04L12/66 ,  H04L12/2801

Abstract: A method of processing sampled voice packets from a voice packet sender for transmission over a bit-rate sampled data transmission system, such as by a cable modem over a cable modem termination system, to a voice packet recipient. Unsolicited grant arrivals in response to a request from the voice packet sender coupled to the cable modem are determined. The storing of sampled voice packets is synchronized with the unsolicited grant arrivals. Upon receipt of an unsolicited grant arrival, currently stored sampled voice packets are transmitted to the cable modem for further transmission to the voice packet recipient over the cable modem termination system. The synchronization includes determining time needed between adjacent unsolicited grant arrivals for storing the sampled voice packets and for processing stored sampled voice packets, sampling voice packets by clocking voice packet sampling using a clock derived from a cable modem clock, and scheduling processing of the stored sample voice packets to be ready for transmission at a next unsolicited grant arrival. The time needed determination involves counting time between unsolicited grant arrivals and upon reaching a count indicative of the interval between unsolicited grant arrivals, providing for transmission of the currently stored sampled voice packets at the next unsolicited grant arrival.

公开(公告)号：US20040264468A1

公开(公告)日：2004-12-30

申请号：US10900382

申请日：2004-07-28

Applicant: Broadcom Corporation

Inventor： John D. Horton JR. ,  Robert J. Lee ,  David M. Pullen

IPC: H04L012/28

CPC classification number: H04L65/608 ,  H04L29/06027 ,  H04L69/04 ,  H04L69/22 ,  H04Q11/04 ,  H04Q2213/13034 ,  H04Q2213/1305 ,  H04Q2213/13166 ,  H04Q2213/13202 ,  H04Q2213/13296 ,  H04Q2213/13389 ,  H04W28/06

Abstract: Data packets transmitted over a cable network are suppressed by hardware at the transmitting end and expanded on the receiving end. This conserves bandwidth as well as reduces the processing resource requirements in both the CM and the CMTS. An extended header element is added to a data packet that is to be transmitted over the cable network. The extended header element contains an index that is used along with the SID to access a rule. The rule is used to determine which bytes are to be suppressed at the transmitter and expanded at the receiver.

Abstract translation: 通过有线网络传输的数据包在发送端被硬件抑制，并在接收端扩展。 这节省了带宽，并减少了CM和CMTS中的处理资源需求。 扩展头元素被添加到要通过有线网络传输的数据包。 扩展头元素包含与SID一起用于访问规则的索引。 该规则用于确定在发射机处将要抑制哪些字节并在接收机处扩展。

公开(公告)号：US20040163120A1

公开(公告)日：2004-08-19

申请号：US10780362

申请日：2004-02-17

Applicant: Broadcom Corporation

Inventor： Theodore F. Rabenko ,  James C. H. Thi ,  John D. Horton JR. ,  Thomas J. Quigley ,  Lisa V. Denney ,  Jonathan S. Min ,  Christopher R. Jones ,  Henry Samueli ,  Fang Lu ,  Feng Chen ,  Sean F. Nazareth

IPC: H04N007/173 ,  H04L012/50 ,  H04Q011/00 ,  H04L012/66 ,  G01R031/08 ,  G08C015/00 ,  H04L012/26 ,  G06F011/00 ,  H04J003/14 ,  H04J001/16 ,  H04L001/00

CPC classification number: H04L12/2801 ,  H04J3/0655 ,  H04L1/0003

Abstract: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.