CN111953917A - Channel locking and binding method based on DOCSIS3.1 system - Google Patents

Abstract

The invention discloses a channel locking and binding method based on a DOCSIS3.1 system, which comprises that a CM searches MDD information from a downlink channel, and a channel list obtained after the MDD information is analyzed is defined as a mixed standard and is marked as Annex F when the channel list has both European standard and American standard; the CM starts to perform uplink ranging, acquires IP and configuration files, enters a registration process after the uplink ranging is completed, encapsulates and receives a channel configuration file RCP to a registration message and sends the registration message; and replying RCP confirmation after the validity detection of the CMTS passes, and performing mixed channel locking by the CM according to parameters in the RCP confirmation by adopting tuner reverse initialization and rapid initialization methods, and finally registering online. The invention provides a novel locking and binding technology based on a DOCSIS3.1 system, flexibly combines the existing European standard frequency points and American standard frequency points, improves the channel utilization rate, ensures high bandwidth and ensures the support of the existing standard.

Description

Channel locking and binding method based on DOCSIS3.1 system

Technical Field

The invention relates to the technical field of cable television, in particular to a channel locking and binding method based on a DOCSIS3.1 system.

Background

Docsis (data Over Cable Service Interface specifications)3.1 system, modulation of physical layer LDPC + OFDM + up to 4096QAM, one channel of up 1G/down 10G, 192MHz, more available physical spectrum: 5-85/204 MHz at the upper row and 108/258-1288/1788 MHz at the lower row. MAC also improves correspondingly, and can be compatible with D2.0/3.0 equipment, and can be integrated into CCAP platform. In addition, because DOCSIS3.1 adopts advanced active queue management (active queue management) technology, QoS is better, and network delay can be significantly reduced. With the use of 5G technology, the convergence of 5G and cable access networks is also a trend, such as 5G + DOCSIS3.1 backhaul application. High bandwidth requires more frequency resources, especially in DOCSIS3.1 system, OFDM channel occupies more frequency resources, and QAM channel frequency resources are very tight.

Most cable network operators do not consider the large amount of frequency resources required for cable upgrade to high bandwidth in the initial frequency planning, and after releasing the early analog and standard-definition channels, the channel resources are too discrete and not all standard 8MHz and 6MHz, so that the conventional DOCSIS3.1 technology cannot fully utilize these frequencies, for example: there are 4 channels of the U.S. standard, 100M, 106M, 112M, 118M, 4 channels of the U.S. standard 200M, 208M, 216M, 224M, according to the prior art, only 4 channels can be locked at most. Based on the environment, at least 4 channels are not fully utilized, and the frequency resources are greatly wasted.

How to fully utilize the existing frequency resources and how to centralize the idle discrete frequency resources is not a feasible method in the prior art.

Disclosure of Invention

The invention aims to provide a channel locking and binding method based on a DOCSIS3.1 system, which is used for solving the problem that the DOCSIS3.1 system in the prior art cannot utilize discrete channel resources to cause frequency resource waste.

The invention solves the problems through the following technical scheme:

a channel locking and binding method based on a DOCSIS3.1 system comprises the following steps:

step S1: powering on a cable modem CM, and initializing a system, wherein the system comprises a demodulator tuner which is initialized in a European standard or American standard mode;

step S2: the CM scans and locks a downlink channel, searches a synchronous signal from the downlink channel, searches an MDD message according to the synchronous signal, and defines a mixed standard as Annex F when a channel list obtained after the MDD message is analyzed has both an European standard channel and a American standard channel;

step S3: the CM starts to perform uplink ranging, starts to acquire IP and configuration files after ranging is completed, enters a registration flow after the ranging is completed, and encapsulates and receives a channel configuration file RCP to register information and sends the information;

step S4: the CMTS carries out validity detection on the received registration message, replies RCP confirmation after the validity detection passes, and after the CM receives the RCP confirmation of the CMTS, the CM carries out mixed channel locking by adopting tuner reverse initialization and rapid initialization methods according to parameters in the RCP confirmation, and finally registers online.

The step S4 includes:

step S41: the CMTS receives the RCP code and then checks the Rcpid and Rcp frequency interval, wherein the Rcp frequency interval is the bandwidth of the first channel in the channel list; after checking that the channel list is legal, the CMTS replies RCP confirmation, wherein the RCP confirmation comprises the channel list needing to be locked;

step S42: the CM transfers the parameters of the channel list to a tuner module in sequence, wherein the tuner module comprises L entities, each entity locks a American standard channel or an European standard channel, and N is the sum of the number M of the European standard channels needing to be locked and the number N of the American standard channels;

step S43: for each tuner entity in turn: firstly, trying a European standard, unloading the tuner drive if the European standard fails, loading the tuner drive according to a American standard, and trying by the American standard; if the success is found, the driver is loaded according to the European standard, and the European standard is used for trying to ensure that the tuner module locks M European standard channels and N American standard channels simultaneously.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) the invention provides a novel locking and binding technology based on a DOCSIS3.1 system, flexibly combines the existing European standard frequency points and American standard frequency points, improves the channel utilization rate, ensures high bandwidth and ensures the support of the existing standard.

(2) On the basis of not increasing cost and extra configuration, the invention adopts new locking and binding technology, effectively utilizes idle frequency spectrum resources, improves bandwidth utilization rate, is compatible with the original environment and has good expansibility.

Drawings

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a flowchart of tuner invocation.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

Example (b):

referring to fig. 1, a method for locking and bonding channels based on a DOCSIS3.1 system includes:

one, mixed mark channel binding

For example, an operator has idle frequency points 100M, 108M, 116M, 124M, 700M, 706M, 712M, 718M, and a downlink channel list in an MDD (MAC Domain Descriptor) message is as follows:

table 1: downlink channel list in MDD message

After receiving the MDD message, the CM (cable modem) installs TLV format parsing, and the originating channel list has both european standard (european standard, 8MHz bandwidth, Annex a) and american standard (american standard, 6MHz bandwidth, Annex B), and the CM in the conventional method considers that the MDD message has an error and enters the DOCSIS2.0 mode. In the invention, the channel list with the European standard and the American standard is defined as a mixed standard (the channel list with the European standard and the American standard) in the CM, and is marked as Annex F for subsequent RCP coding and channel locking.

When the CM finds that the analyzed MDD message has a mark Annex F, the RCP coding is carried out by adopting a method of RcpClabFM016, wherein the format of the RcpClabFM016 is as follows:

table 2: RcpClabFM016 format table

RcpId	0010180008	Unique code of Rcp
			RcpName	051-FM-8DS-001	Rcp name
Rcp frequency interval	8	Frequency interval of 8Mhz

001018 in RcpId is the vendor proprietary extension ID in the DOCSIS3.1 specification, since most cmts (cable Modem Terminal systems) now can identify the IDs of blosson and Intel, where blosson ID is used. 0008 is the channel number coding, here 8.

The Rcp frequency spacing is based on the bandwidth of the first channel in table 1, here 8 MHz.

According to this encoding, the CM sends an RCP registration message to the CMTS, and the CMTS, upon receipt of the RCP, begins checking for validity, the key parameters being the Rcpid and Rcp frequency spacing. After checking for validity, the CMTS replies with an RCP acknowledgement from which the CM knows the list of channels that need to be locked, as follows:

all channel parameters are derived from the above data CM.

Two, channel locking

After the CM acquires RCP and confirms, parameters such as frequency points, modulation modes and the like in the channel list are sequentially transmitted to the tuner module according to the sequence. the tuner module comprises 8 tuner entities, each of which can lock a one-way dollar or euro-scale channel. Because the tuner module adopts the European standard or the American standard and is completed in the drive initialization, the switching in the operation process is impossible according to the prior design. In this invention, if Annex F is marked to indicate aliasing, then by designing the anti-initialization and fast initialization methods of the tuner module, it is ensured that the tuner can lock on multiple euro and american channels simultaneously. the method for the reverse initialization and the rapid initialization of the tuner module comprises the steps that each tuner entity needs 2 attempts according to the Annex F, the European standard is adopted firstly, if the answer is failed, the tuner drive is unloaded, the tuner drive is loaded according to the American standard, the American standard is used for trying, and 8 paths of tuner entities are all according to the flow, so that the tuner can be ensured to lock a plurality of European standard channels and American standard channels simultaneously, and the bandwidth utilization rate is improved.

For example, in a cable network operator system, there are 8 channels as follows: the channel is a 2-way American standard channel, 100M, 106M, 6-way European standard channel 200M, 208M, 216M, 224M, 232M, 240M.

If the CM uses Annex A, the CM can only lock and bind 6 channels of European standard channels, and the downlink speed theory can maximally reach 333.72 Mbps; if the CM uses Annex B, the CM can only lock and bind 2 American standard channels, and the downstream speed theory can reach the maximum speed of 85.76 Mbps.

After the Annex F mode is used, the CM can lock and bind 8 paths of mixed channels, and the downlink speed theory can maximally reach 419.48 Mbps. Compared with the European standard mode, the downlink speed is improved by about 25.6 percent; compared with the American standard mode, the descending speed is improved by about 389.4 percent. It can be seen that bandwidth utilization is significantly improved.

In a wired network operator system, the above example 4 european standard +4 american standard combination is only one of many topology environments, and a plurality of different topologies can be dealt with according to the idea of the present invention.

At the same time, the present invention also supports existing standards.

CM is powered on, system initialization, including tuner initialization, when tuner has determined to be in European or American standard mode. Scanning and locking a downlink channel, searching a synchronous signal from the downlink channel, searching an MDD message according to the synchronous signal, determining whether the environment is a mixed standard environment according to the description of the MDD message on a downlink channel list, and marking Annex F at the moment.

And the CM starts to perform uplink ranging, starts to acquire IP and configuration files after ranging is completed, and enters a registration flow after the ranging is completed. And according to the Annex F obtained in the previous step, packaging and sending the RCP coding format in the registration message, after receiving the RCP confirmation of the CMTS, locking by adopting tuner reverse initialization and rapid initialization technology according to the RCP configuration, and finally registering online.

Tuner call flow as shown in figure 2,

a, initializing tuner drive, calling tuner locking interface function,

b, setting downlink frequency points, and judging marks:

if the number is Annex F, setting the number to be 8MHz, judging whether the locking is successful, and if the locking is successful, entering C; otherwise, setting the frequency to be 6MHz, judging whether the locking is successful again, if so, entering C, and if not, ending;

if the number is Annex A, setting the number to be 8Mhz, judging whether the locking is successful, if so, entering C, and if not, ending;

if the number is Annex B, setting 6MHz, judging whether the locking is successful, if so, entering C, otherwise, ending;

c, setting the next downlink frequency point, and returning to the B;

when Annex F is marked, frequency locking is carried out for 2 times by 8 tuner entities, the frequency locking is carried out for the first time by using an European standard, whether the interface is successful or not is judged according to the frequency locking, if the frequency locking is failed, the tuner is reinitialized to be in a American standard mode, and the frequency locking is successful.

Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.

Claims (2)

1. A channel locking and binding method based on a DOCSIS3.1 system is characterized by comprising the following steps:

step S1: powering on a cable modem CM, and initializing a system, wherein the system comprises a demodulator tuner which is initialized in a European standard or American standard mode;

step S2: the CM scans and locks a downlink channel, searches a synchronous signal from the downlink channel, searches an MDD message according to the synchronous signal, and defines a mixed standard as Annex F when a channel list obtained after the MDD message is analyzed has both an European standard channel and a American standard channel;

step S3: the CM starts to perform uplink ranging, starts to acquire IP and configuration files after ranging is completed, enters a registration flow after the ranging is completed, and encapsulates and receives a channel configuration file RCP to register information and sends the information;

step S4: and after the CM receives the RCP confirmation of the CMTS, the channel is mixedly locked by adopting tuner reverse initialization and rapid initialization methods according to parameters in the RCP confirmation, and finally the registration is on line.

2. The method for channel locking and bonding according to claim 1, wherein said step S4 comprises:

step S41: the CMTS receives the RCP code and then checks the Rcpid and Rcp frequency interval, wherein the Rcp frequency interval is the bandwidth of the first channel in the channel list; after checking that the channel list is legal, the CMTS replies RCP confirmation, wherein the RCP confirmation comprises the channel list needing to be locked;

step S42: the CM transfers the parameters of the channel list to a tuner module in sequence, wherein the tuner module comprises L entities, each entity locks a American standard channel or an European standard channel, and N is the sum of the number M of the European standard channels needing to be locked and the number N of the American standard channels;

step S43: for each tuner entity in turn: firstly, trying a European standard, unloading the tuner drive if the European standard fails, loading the tuner drive according to a American standard, and trying by the American standard; if the success is found, the driver is loaded according to the European standard, and the European standard is used for trying to ensure that the tuner module locks M European standard channels and N American standard channels simultaneously.

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