Time slice and confliction avoidance method in CATV network
A time slicing, transmission network technology, applied in cable transmission adaptation, transmission system, electrical components, etc., can solve problems such as data collision
Active Publication Date: 2011-04-06
北京东方广视科技股份有限公司
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In order to solve the problem in the prior art that data collisions are easily generated when multiple CM Vs send uplink information to GW2 at the same time, the present invention provides a method for time slicing and conflict avoidance in a cable TV transmission network, which specifically includes the following steps:
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0017] In the present invention, GW2 and CM_V communicate by means of time slicing and preempting time slots. GW2 regularly sends broadcast data to CM_V, and responds with a response data frame after receiving the data frame from CM_V. The downlink broadcast frame contains the time slot width and the total number of time slots. CM_V uploads data to GW2 within the time slots allowed for uploading. After data collision occurs, it uses the newly generated time slot number to re-seize the time slot to send data. The frame method basically avoids the possibility of data collision again, realizes collision avoidance, can achieve high accuracy, and improves the efficiency of two-way data transmission.
[0018] see figure 2 , the present invention provides a method for time slicing and conflict avoid...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for time slicing and collision avoidance of a transmission network for cable TV, which belongs to the transmission field of cable TV. To solve the problem of extremely easy generation of data collision in the prior art when a plurality of CM_Vs transmit upstream information to a GW2 at the same time, the invention provides the method for time slicing and collision avoidance in the transmission network of cable TV, which includes the processes: the GW2 slices time, transmits broadcast frames to the CM_Vs according to a stated period and then responds to responseframes after receiving data frames from the CM_Vs; and CM_Vs generate new serial numbers of time slot after detecting data collision so as to occupy the time slot again and transmit the data frames. By time slicing and generating new serial numbers of time slot after data collision to occupy the transmission data frame again, the invention reduces the probability of data collision again to the minimal, thus guaranteeing the high efficiency of bidirectional transmission of data; and the new serial numbers generated by combing with bits which are elected from calibration and CSC calibration at random are applied, so the same probability is quite small.
Description
technical field [0001] The invention relates to the field of cable TV transmission, in particular to a method for time slicing and conflict avoidance in a cable TV transmission network. Background technique [0002] At present, the HFC (Hybrid Fiber Coax, hybrid fiber coaxial cable) network is a fiber-optic cable hybrid network with the characteristics of broadcasting and television. Business; data and video are based on the same network; data rate is high, technology is mature, etc., and the transformation of the radio and television network is used to enable the network to realize the data access of Cable Modem (cable modem). In the modified radio and television network, the topology between GW2 (GateWay2, gateway 2) and CMV (Cable Modem Video On Demand, video on demand cable modem) is multipoint to single point, such as figure 1 shown. GW2 is an edge device, and multiple CM V devices can be connected to each GW2. The CM V is located in the user's home and is connected t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/10H04L29/02
Inventor 冯为心徐卫东上官志达余振东许峰波
Owner 北京东方广视科技股份有限公司