A hybrid channel fast scanning method based on DOCSIS 3.1 system equipment

Abstract

The application discloses a kind of hybrid channel fast scanning method based on DOCSIS3.1 system equipment, channel management module dispatches the N entity of tuner, selects scanning frequency, lock frequency span, frequency point is passed to channel locking module;Channel locking module calls tuner entity and carries out lock frequency operation, if locking succeeds, judge whether the channel is OFDM channel or QAM channel, and pass message to channel access module;Channel access module obtains the information of corresponding channel, locks corresponding channel, and passes back the locking result to channel management module, completes online process.The application shortens the scanning time of downlink channel under the environment of DOCSIS3.0 without affecting the process of DOCSIS3.1, improves online efficiency.

Description

Technical Field

[0001] This invention relates to the field of communication technology, specifically to a hybrid channel fast scanning method based on DOCSIS 3.1 system equipment. Background Technology

[0002] DOCSIS technology has been developing for nearly 20 years, going through four generations: 1.0, 1.1, 2.0, 3.0, and now the latest version, DOCSIS 3.1. Released in September 2017, DOCSIS 3.1 boasts advanced technological advantages in spectrum spreading, OFDM modulation, and LDPC coding. Currently, many overseas operators have begun large-scale deployments of DOCSIS 3.1, but domestic operators only have small-scale pilot programs, with their environments primarily based on DOCSIS 3.0. DOCSIS 3.0 provides a wider bandwidth surfing experience through channel bonding. Therefore, in practical applications, multiple 6MHz / 8MHz channels are bonded together, with both downlink and uplink channels treated as a single logical channel. The number of bonded channels is at least four. DOCSIS 3.1 primarily supports OFDM / OFDMA modulation and is backward compatible with DOCSIS 3.0's single-carrier QAM (SC-QAM) systems. In the current DOCSIS 3.1 system, devices first scan OFDM, and then start QAM channel scanning after the scan is completed. In the DOCSIS 3.0 environment, this affects the device uptime. Summary of the Invention

[0003] The purpose of this invention is to provide a fast hybrid channel scanning method for DOCSIS 3.1 system devices, which solves the problem that in the prior art, DOCSIS 3.1 system devices first scan OFDM and then start QAM channel scanning after the scan is completed, which affects the device's online speed in the DOCSIS 3.0 environment.

[0004] The present invention solves the above problems through the following technical solution:

[0005] A hybrid channel fast scanning method based on DOCSIS 3.1 system equipment includes a channel management module, a channel locking module, and a channel access module, wherein:

[0006] Step S1: The channel management module schedules N entities of the tuner, selects the scanning frequency point and the frequency locking span, and passes the frequency point to the channel locking module to complete the online process;

[0007] Step S2: The channel locking module calls the tuner entity to perform frequency locking operation. If locking fails, a message is sent to the channel management module. If locking succeeds, it determines whether the channel is an orthogonal frequency division multiplexing (OFDM) channel or an orthogonal amplitude modulation (QAM) channel and sends a message to the channel access module.

[0008] Step S3: Based on the acquired messages, if it is an OFDM channel, the channel access module acquires the power line carrier communication PLC information, OCD information, and DPD / NCP information, and then the cable modem locks the OFDM channel; if it is a QAM channel, if the DMD message and DSM message are successfully acquired, the cable modem locks the QAM channel and transmits the locking result back to the channel management module.

[0009] This invention shortens the downlink channel scanning time in the DOCSIS 3.0 environment and improves the online efficiency without affecting the DOCSIS 3.1 process.

[0010] Step S2 specifically includes:

[0011] Step S21: Initialize the channel state tree. Each node contains the frequency points of all downlink channels, and the node state is updated during the execution process. Each node corresponds to one channel.

[0012] Step S22: tuner entity 1 locks the frequency of node 1, tuner entity 2 locks the frequency of node (X+1), the frequency difference between tuner entity 1 and tuner entity 2 is the frequency locking span X, ..., tuner entity N locks the frequency of node (N*X+1), and the parameters are passed to the channel locking module for locking.

[0013] Step S23: If a signal is found in the first-level sibling node, but the channel access module returns failure, then channel locking and channel access operations are performed on the sibling node and the child nodes of the preceding and following nodes.

[0014] Step S24: Determine whether an OFDM channel or a QAM channel exists. If an OFDM signal channel exists, QAM channel determination is not performed.

[0015] Step S25: Repeat steps S22 to S24 until uplink information is obtained, and then transmit the message to the channel access module.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] This invention enables simultaneous scanning of OFDM and QAM channels under downlink channel environments in DOCSIS 3.1 and DOCSIS 3.0 protocols. In the DOCSIS 3.0 environment, it improves scanning speed and shortens time-to-workout (TTL). In actual tests using a DOCSIS 3.1 system, the TTL was improved by approximately 50% during the scanning process when the device was brought online in the DOCSIS 3.0 environment. Attached Figure Description

[0018] Figure 1 This is a system block diagram of the present invention;

[0019] Figure 2 This is a flowchart of the channel locking module's workflow.

[0020] Figure 3 Here is a flowchart of the channel access process;

[0021] Figure 4 This is a schematic diagram of the channel state tree;

[0022] Figure 5 A schematic diagram of the frequency locking span for frequency locking operations on the tuner entity;

[0023] Figure 6 This is a schematic diagram illustrating channel locking for sibling nodes and child nodes of preceding and following nodes. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0025] Example 1:

[0026] Combined with appendix Figure 1 As shown, a hybrid channel fast scanning method based on DOCSIS 3.1 system equipment includes a channel management module, a channel locking module, and a channel access module, wherein:

[0027] The channel management module is used for the overall scheduling of N entities of the tuner, as well as the selection of scanning frequency points and frequency locking spans, and the transmission of frequency points to the channel locking module to complete the online process;

[0028] The channel locking module is used to call the tuner entity to perform frequency locking operations. When there is no signal on the channel, it sends a locking failure message to the channel management. When there is a signal on the channel, it determines whether the channel is an OFDM channel or a QAM channel and sends a message to the channel access module.

[0029] The channel access module is used to acquire messages, including PLC information, OCD information, and DPD / NCP information of OFDM channels, DMD messages of QAM channels, lock the corresponding channels, and transmit the locking results back to the channel management module.

[0030] The methods include:

[0031] Step S1: The channel management module reads the saved uplink and downlink channels from the frequency buffer and passes the parameters to the channel locking module. The channel locking module then passes the result to the channel access module. If successful, the CableModem proceeds to step S3 to complete the online process; otherwise, it proceeds to step S2.

[0032] Step S2: Initiate a fast mixed-channel scan, such as... Figure 2 and Figure 3 As shown, it includes:

[0033] Step S21: Initialize the channel state tree. Each node contains the frequency points of all downlink channels, and the node state is updated during the execution process. Each node corresponds to one channel.

[0034] Step S22: tuner entity 1 locks the frequency of node 1, tuner entity 2 locks the frequency of node (X+1), the frequency difference between tuner entity 1 and tuner entity 2 is the frequency locking span X, tuner entity N locks the frequency of node (N*X+1), and the parameters are passed to the channel locking module for locking.

[0035] Step S23: If a signal is found in the first-level sibling node, but the channel access module returns a failure, then channel locking and channel access operations are performed on the sibling node and the child nodes of the preceding and following nodes.

[0036] Step S24: If an OFDM signal channel exists, QAM channel determination is not performed.

[0037] Step S25: Repeat steps S22 to S24 until the uplink information is obtained.

[0038] Furthermore, in step S21, the channel state tree is as follows: Figure 4 As shown, each node corresponds to a channel, with node 1 being the starting frequency and node E being the ending frequency. If none of the N tuner entities have locked onto a channel in the first time slice, then locking will begin from node (N*X+1) and continue until node E.

[0039] Furthermore, in steps S21 and S22, the frequency-locking span is the channel span between each frequency lock, that is, the sum of the sibling node and the child nodes contained under the sibling node, assumed to be X. Figure 5 As shown (assuming X=4), channel 1 is the sibling node 1, and channels 2 to 4 are the child nodes of node 1, with a frequency locking span of 4 channels.

[0040] Furthermore, in step S22, the frequency points of the nodes are as follows: Node 1 is the starting frequency point of the downlink channel; in the European standard channel, Node 2 is the frequency point of Node 1 + 8M; and in the American standard channel, Node 2 is the frequency point of Node 1 + 6M.

[0041] Furthermore, in step S23, as Figure 6 As shown, if sibling nodes 13 and 21 have no signal, and sibling node 17 finds a signal but the channel access module returns a failure, then the next step is to pass channels 14 to 16 and channels 18 to 20 to the channel locking module.

[0042] Step S3: The CableModem completes downlink channel scanning and obtains uplink UCD.

[0043] Step S4: The CableModem performs uplink ranging and obtains the IP address and configuration file. After completion, it enters the registration process.

[0044] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can devise many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A fast hybrid channel scanning method based on DOCSIS 3.1 system equipment, characterized in that, It includes a channel management module, a channel locking module, and a channel access module, wherein: Step S1: The channel management module schedules N entities of the tuner, selects the scanning frequency point and the frequency locking span, and passes the frequency point to the channel locking module to complete the online process; Step S2: The channel locking module calls the tuner entity to perform frequency locking operation. If locking fails, a message is sent to the channel management module. If locking succeeds, it determines whether the channel is an orthogonal frequency division multiplexing (OFDM) channel or an orthogonal amplitude modulation (QAM) channel and sends a message to the channel access module. Step S3: Based on the acquired messages, if it is an OFDM channel, the channel access module acquires the power line carrier communication PLC information, OCD information, and DPD / NCP information, and then the cable modem locks the OFDM channel; if it is a QAM channel, if the DMD message and DSM message are successfully acquired, the cable modem locks the QAM channel and transmits the locking result back to the channel management module. Step S2 specifically includes: Step S21: Initialize the channel state tree. Each node contains the frequency points of all downlink channels, and the node state is updated during the execution process. Each node corresponds to one channel. Step S22: tuner entity 1 locks the frequency of node 1, tuner entity 2 locks the frequency of node (X+1), the frequency difference between tuner entity 1 and tuner entity 2 is the frequency locking span X, ..., tuner entity N locks the frequency of node (N*X+1), and the parameters are passed to the channel locking module for locking. Step S23: If a signal is found in the first-level sibling node, but the channel access module returns failure, then channel locking and channel access operations are performed on the sibling node and the child nodes of the preceding and following nodes. Step S24: Determine whether an OFDM channel or a QAM channel exists. If an OFDM signal channel exists, QAM channel determination is not performed. Step S25: Repeat steps S22 to S24 until uplink information is obtained, and then transmit the message to the channel access module.

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