KR100821562B1 - Determination of Cable Modem-Service Group in Optical-Coaxial Network - Google Patents

Abstract

A method of determining a cable modem-service group (CM-SG) of a cable modem (CM) is disclosed. In this method, the Cable Modem Termination System (CMTS) is streamed upstream of the Cable Modem with multiple transceivers in a Hybrid-Fiber-Coaxial Network. It is characterized by creating an ambiguous channel list and performing initial ranging in parallel.

According to the present invention, unlike the conventional cable modem (CM) performs the initial ranging according to the uplink channel encoding encoding of the ranging response message sequentially until the upstream ambiguity is resolved from the cable modem terminal (CMTS), By omitting the above procedure and attempting ranging in parallel on upstream channels with upstream ambiguity, the cable modem termination equipment (CMTS) can determine the cable modem-service group at high speed and initialize the cable modem (CM). This has the effect of completing the setup faster.

Description

Method of determining Cable Modem-Service Group in Hybrid-Fiber-Coaxial Networks}

1 illustrates an initialization process of a cable modem (CM) in an optical-coaxial mixed network.

2 illustrates a process of determining a MAC domain-upstream-service group (MD-US-SG) of a cable modem (CM).

3 illustrates an embodiment of creating a ranging response message transmitted by a cable modem termination device (CMTS) in the upstream-service group ambiguity resolution process.

4 illustrates an embodiment of an upstream-service group ambiguity resolution procedure of a cable modem (CM).

FIG. 5 illustrates an embodiment of a procedure for determining a cable modem service group in a cable modem termination device (CMTS) according to the present invention.

FIG. 6 illustrates an embodiment of a procedure for determining a cable modem-service group in a cable modem (CM) according to the present invention.

FIG. 7 illustrates an embodiment of writing a ranging response message of a cable modem termination device according to the present invention.

The present invention relates to a cable modem-service group determination method, and more particularly, a cable modem termination device (CMTS) and a cable modem (CM) having a device capable of transmitting and receiving data in a plurality of channels in an optical-coaxial mixed network. In the initializing process, the cable modem termination device (CMTS) determines a cable modem-service group (CM-SG) through initial ranging of the cable modem (CM).

Each RF signal transmitted from a cable modem termination unit (CMTS) forms a physical topology of the optical cable through all-optical conversion and branching and combining of the optical signals, and the optical signal terminates at the fiber node (FN) near the cable subscriber. And distributed as RF signals to multiple cable modems (CM). In general, cable modem groups belonging to the same FN share the same set of uplink and downlink RF channels reachable between the cable modem (CM) in the same cable modem termination device (CMTS), which is defined as a cable modem-service group. The cable modem termination device (CMTS) needs to know which channels the cable modem (CM), which can simultaneously transmit and receive multiple channels, transmits and receives data, and that is through a channel information message transmitted to the channel. Obtained. The present invention describes a method for a cable modem termination device (CMTS) to determine a cable modem-service group in a faster way in handling the initialization process of the cable modem (CM).

FIG. 1 illustrates a procedure required when initializing a cable modem (CM) or resetting a MAC in a conventional DOCSIS cable network. The cable modem (CM) receives and synchronizes a SYNC message through downstream (step 120), and when the synchronization is synchronized, acquires information on the MAC domain through a MAC Domain Descriptor (MDD) message, and obtains a MAP message and an UCD (Upstream). Initial ranging process is performed by receiving uplink channel information by receiving a Channel Descriptor) message. In the initial ranging process, the cable modem service group is determined (steps 143 and 144). The operation of the cable modem (CM) in the determination process is as follows. If the cable modem (CM) can receive the MDD message through the synchronized downlink channel, it initializes to a mode that supports multiple channels (step 142), and the MAC domain-downstream-service group (MD-DS-SG). And MAC domain-upstream-service group (MD-US-SG) (steps 143 and 144). If the cable modem (CM) does not receive the MDD message, the initialization is set to the single channel support mode (step 146), the acquisition of the up channel parameters (step 147), and then ranging (step 148). When the initial ranging process is completed (step 150), the cable modem CM performs a security authentication procedure and attempts to set up for an IP connection (step 170). When the connection is complete, download the configuration information file required for the cable modem (CM) registration process, perform the registration process and complete the initialization process (step 180).

2 illustrates a process of determining a MAC domain-upstream-service group (MD-US-SG) when a cable modem (CM) receives an MDD message on a downlink channel after downlink synchronization. The cable modem (CM) randomly lists the upstream channel IDs (UCIDs) in the encoding indicating the upstream ambiguity resolution channel list of the received MDD message (step 202), and the corresponding uplink identifiers (UCIDs) Collect UCD messages for step 203). If a specific uplink identifier (UCID) has a priority, rearranged to be preferentially selected from an uplink resolution list (step 204), and then selects one by one to perform ranging holdoff and initial bonding ranging. (Step 207). If the ranging fails, the next upstream channel identifier (UCID) may be selected from the upstream channel identifier list (step 205) and attempted for all channels in the list. If the ranging request message is successfully transmitted for the initial bonding ranging, the upstream ambiguity initial ranging is started (step 209).

3 illustrates an example of creating a ranging response message transmitted by a cable modem termination device (CMTS) to resolve upstream ambiguity. When the cable modem terminator (CMTS) receives a bonding initial ranging request message (B-INIT-RNG-REQ) from the cable modem (CM), the MAC domain-downstream-service group (MD-DS-SG) of the cable modem ) And determine whether there is upstream ambiguity to determine the final cable modem-service group. If the cable modem service group cannot be determined due to the upstream stream ambiguity, the ranging response message (RNG-RSP) includes the uplink channel coordination encoding 300 for ambiguity resolution. During the upstream ambiguity resolution, the cable modem termination device (CMTS) may include only one uplink channel adjustment TLV 310 and may or may not include the ranging parameter 311.

4 illustrates a process of performing upstream ambiguity initial ranging of a cable modem (CM). The cable modem (CM) sends a B-INIT-RNG-REQ message in the MAC Domain-Upstream-Service Group (MD-US-SG) decision. When the message is transmitted, the response is transmitted successfully, and the ranging response message is received from the cable modem end device (CMTS) (step 420), the upstream channel coordination encoding is included in the message indicating upstream ambiguity. In this case, if there is ranging response message information, that is, uplink identifier (UCID), service ID (SID), initialization technique, and other ranging parameter information, INIT-RNG- is transmitted to the corresponding channel using the encoding information. The REQ message is transmitted (step 440). After the message is sent, the ranging response message waiting time (T3) timer is driven (step 450) and waits for the ranging response message (step 460). If the ranging response message is received and the ranging status field is not Abort (step 480), the process returns to step 420 again to determine whether the ranging response message includes uplink channel adjustment encoding. If it is determined that uplink channel encoding is included, the process of step 430 and step 480 are repeated again. If not included, the upstream ambiguity is considered resolved and the upstream ambiguity ranging is complete. If the ranging response message is not received and the timeout of the ranging response message waiting time (T3) occurs, and the number of retransmissions of the ranging request message is not exceeded (step 471), the message is transmitted again. If the timeout of the waiting time T3 timer has occurred and the number of retransmissions of the ranging request message has been exceeded, the ranging request message is transmitted again through a channel that has successfully ranged (step 476). If no channel has successfully ranged previously, restart the cable modem (CM) (step 473).

As described above, the cable modem termination device (CMTS) receives the B-INIT-RNG-REQ message to the cable modem (CM) to determine the MAC domain-downstream-service group (MD-DS-SG) and MAC domain. -If it is determined that the upstream ambiguity in determining the upstream-service group (MD-US-SG) is determined, the cable modem (CM) causes the cable modem (CM) By sequential ranging attempts, delays may occur before determining the final MAC domain-service group. If the initialization technique is set to broadcast initial ranging in the ranging response message, or the ranging parameter is missing, the ranging retries may increase, which may cause considerable delay.

An object of the present invention is to provide a cable modem termination device (CMTS) and a cable modem (CM) having a plurality of transceivers in an optical-coaxial mixed network to an ambiguity in an uplink channel in determining a cable modem service group. In order for the cable modem (CM) to attempt ranging on one upstream channel at a time to avoid delays in determining the service group, parallel to upstream ambiguity channels. By performing the initial ranging to provide a method for performing a faster initialization of the cable modem (CM).

In order to achieve the above technical problem, the cable modem-service group determination method according to the present invention includes a cable modem termination device (CMTS) upstream in an initialization process of a cable modem having a plurality of transceivers in an optical-coaxial mixed network. It is characterized by creating an ambiguous channel list and performing initial ranging in parallel.

Preferably, the cable modem terminator (CMTS) is configured to set a ranging response message including a plurality of uplink channel encoding encoding for the channel having the upstream ambiguity.

Preferably, the cable modem CM performs ranging in parallel by using encoding information of a message received from the cable modem termination device CMTS.

Preferably, the cable modem termination device (CMTS) is characterized by determining the service group of the cable modem through a plurality of ranging request information received from the cable modem (CM).

In order to achieve the above technical problem, the method for determining a cable modem service group according to the present invention includes a cable modem termination device (CMTS) in an initialization process of a cable modem having a plurality of transceivers in an optical-coaxial mixed network. )

Receiving an initial ranging request message for bonding to determine whether there is an upstream ambiguity, generating an upstream ambiguity channel list if it is determined to be upstream ambiguity, and uplink channel encoding encoding for the upstream ambiguity channel list Generating a ranging response message, allocating a band for transmitting a ranging request message by the cable modem to an upstream ambiguity channel list, and receiving a range request message in parallel from the cable modem through the allocated band. Receiving comprises a step of receiving.

Preferably, the uplink channel coordinated encoding is characterized in that the uplink channel coordinated TLV.

Preferably, the step of allocating the band is characterized by allocating a unicast band for all channels in the up-ambiguous channel list.

In order to achieve the above technical problem, a method for determining a cable modem service group according to the present invention is a cable modem having a plurality of transceivers in an optical-coaxial mixed network. Receiving a ranging response message from the device, and if the received message includes one or more uplink channel adjustment encoding information, the uplink channel in the transmission range of the cable modem is selected using the encoding information to parallel lane. And sending a gong request message.

Preferably, the uplink channel adjustment encoding information is an uplink channel adjustment TLV.

Preferably, the cable modem selects all channels within the transmission range of the cable modem from the uplink channel adjustment TLV list and attempts to transmit a message.

Hereinafter, a method for determining a cable modem service group according to the present invention will be described with reference to the accompanying drawings.

FIG. 5 illustrates an embodiment of a procedure for determining a cable modem service group in a cable modem termination device (CMTS) according to the present invention.

The cable modem termination device (CMTS) receives the B-INIT-RNG-REQ message from the cable modem (CM) as a first step for determining the MAC domain-upstream-service group (MD-US-SG) (step 502). ). When the MAC-Upstream-Service-Group is determined solely by the reception of the B-INIT-RNG-REQ message, the Cable-Modem-Service Group decision is completed. If the MAC domain-upstream-service group is not uniquely determined, a channel list is created for the upstream ambiguity channel (step 504), and the ranging response including the uplink channel coordination TLV for all the upstream ambiguity channel lists. The message is sent (step 506). Then, the cable modem (CM) allocates a unicast band for all channels in the upstream ambiguity channel list so as to transmit a range request (INIT-RNG-REQ) message using the information in the ranging response message (step 507). In step 509, a range request (INIT-RNG-REQ) message may be received in parallel from a plurality of receivers of a cable modem terminal (CMTS). When the MAC domain-upstream-service group is uniquely determined through the message received from the cable modem (CM), the cable modem-service group decision is completed. If the MAC Domain-Upstream-Service Group (MD-US-SG) cannot be determined even after the time allotted for receiving the message has passed, the Cable Modem Termination Unit (CMTS) will remove the Cable Modem (CM) from the poll list. Delete it and finish the initialization for the cable modem.

FIG. 6 illustrates an embodiment of a procedure for determining a cable modem-service group in a cable modem (CM) according to the present invention.

When the cable modem (CM) successfully transmits the B-INIT-RNG-REQ message and receives the range response message, the cable modem (CM) checks whether there is at least one uplink channel coordination TLV in the message (step 620). If the uplink channel coordination TLV is included in the range response (RNG-RSP) encoding, it is determined that the uplink service group ambiguity has not been determined and all channels within the transmission range of the cable modem (CM) are selected from the uplink TLV list (step 630). In operation 640 and 650, a range request (INIT-RNG-REQ) message is transmitted in parallel using information included in the message. After the message is sent, the ranging response message waiting time (T3) timer is driven (step 660), the range response (RNG-RSP) waits for the message transmission (step 670), and the message is received and the ranging state is stopped (Abort). Otherwise, if the received Range Response (RNG-RSP) message determines whether there is an uplink channel adjustment TLV, the uplink ambiguity ranging is completed. If a ranging response message waiting time (T3) timeout occurs before the Range Response (RNG-RSP) message is sent and the number of ranging request message retransmissions is not exceeded, the Range Request (INIT-RNG-REQ) message is resent after the power adjustment. If it has exceeded the number of retransmissions possible (step 681), it checks whether there is a channel that successfully ran before, and if there is a channel that succeeds in ranging, attempts ranging again to that channel (step 684). Restart the MAC (step 683).

7 illustrates an embodiment of creating a ranging response message in a cable modem termination device (CMTS) according to the present invention. The ranging response message includes a MAC management message header 700, a service ID (SID) 701, a response code (702), a fragment number (703), and a fragment sequence (704). , TLV encoding 710. The uplink coordination sub TLV may include ranging parameters 712 in addition to an uplink ID (UCID) and an initialization technique. In the prior art, only one uplink channel coordination TLV is included when used for uplink ambiguity resolution. However, in the present invention, a plurality of uplink channel coordination TLVs 711 are included for fast upstream ambiguity resolution. To make the information available.

Such a method of the present invention has been described with reference to the embodiments shown in the drawings for clarity, but this is merely exemplary, and those skilled in the art may various modifications and other equivalent embodiments therefrom. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

According to the present invention, unlike the conventional cable modem (CM) performs the initial ranging according to the uplink channel encoding encoding of the ranging response message sequentially until the upstream ambiguity is resolved from the cable modem terminal (CMTS), By omitting the above procedure and attempting ranging in parallel on upstream channels with upstream ambiguity, the cable modem termination equipment (CMTS) can determine the cable modem-service group at high speed and initialize the cable modem (CM). This has the effect of completing the setup faster.

Claims (10)

In the initialization process of a cable modem having a plurality of transceivers in an optical-coaxial mixed network, A cable modem-service group determination method, characterized in that the cable modem termination equipment (CMTS) creates an upstream ambiguity channel list and performs initial ranging in parallel. The method of claim 1, And the cable modem terminator (CMTS) establishes a ranging response message for the upstream ambiguity channel including a plurality of uplink channel encoding encodings. The method of claim 1, wherein the cable modem (CM) performs ranging in parallel using encoding information of a message received from the cable modem terminal (CMTS). . 4. The cable modem terminal of claim 1, wherein the cable modem termination device (CMTS) determines a service group of the cable modem through a plurality of ranging request information received from the cable modem (CM). Cable modem-service group determination method. In the initialization process of a cable modem having a plurality of transceivers in an optical-coaxial mixed network, The cable modem termination (CMTS) Receiving a bonding initial ranging request message to determine whether there is upstream ambiguity; Generating an upstream ambiguity channel list if it is determined that the upstream ambiguity is determined; Generating a ranging response message including an uplink channel encoding encoding for the upstream ambiguity channel list; Allocating a band for the cable modem to transmit a ranging request message for the upstream ambiguity channel list; And And receiving a range request message from a cable modem in parallel over the allocated band. The method of claim 5, wherein And the uplink channel coordinated encoding is an uplink channel coordinated TLV. The method of claim 5, wherein Allocating the band And assigning a unicast band to all channels in the upstream ambiguity channel list. In the initialization process of a cable modem having a plurality of transceivers in an optical-coaxial mixed network, The cable modem Receiving a ranging response message from the cable modem end device; And If one or more uplink channel adjustment encoding information is included in the received message, selecting an uplink channel within a transmission range of the cable modem using the encoding information and transmitting a ranging request message in parallel; Method for determining a cable modem-service group, characterized in that. The method of claim 8, And the uplink channel control encoding information is an uplink channel control TLV. The method of claim 9, And the cable modem selects all channels within the transmission range of the cable modem in the uplink channel adjustment TLV list and attempts to transmit a message.

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