Source: http://www.google.com/patents/US6917647?dq=6760745
Timestamp: 2014-03-09 22:03:11
Document Index: 310086819

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

Patent US6917647 - Activation of multiple xDSL modems with power control measurement - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn apparatus and method for determining transmission parameters while initializing a communication link. An initiating communication device includes a parameter indicating device, a measurement receiving section, a parameter receiving device, a measurement transmission section, and a selecting device....http://www.google.com/patents/US6917647?utm_source=gb-gplus-sharePatent US6917647 - Activation of multiple xDSL modems with power control measurementAdvanced Patent SearchPublication numberUS6917647 B2Publication typeGrantApplication numberUS 10/809,865Publication dateJul 12, 2005Filing dateMar 26, 2004Priority dateMay 5, 1999Fee statusPaidAlso published asUS6751254, US20040184520Publication number10809865, 809865, US 6917647 B2, US 6917647B2, US-B2-6917647, US6917647 B2, US6917647B2InventorsStephen PalmOriginal AssigneePanasonic Communications Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (78), Non-Patent Citations (9), Classifications (10), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetActivation of multiple xDSL modems with power control measurementUS 6917647 B2Abstract An apparatus and method for determining transmission parameters while initializing a communication link. An initiating communication device includes a parameter indicating device, a measurement receiving section, a parameter receiving device, a measurement transmission section, and a selecting device. The parameter indicating device transmits first transmission parameters that can be used by a responding communication device. In response to the transmitted first transmission parameters, the measurement receiving section receives first signals issued by the responding communication device. The parameter receiving device receives second transmission parameters that are issued by the responding communication device. The measurement transmission section functions to transmit second signals to the responding communication device, in response to the received second transmission parameters. The selecting device transmits power level parameters that can be used by said responding communication device in response to said received second signals.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 09/564,704 filed on May 4, 2000 now U.S. Pat. No 6,751,254, which claims the benefit under 35 U.S.C. �119(e) of U.S. Provisional Application No. 60/132,702, filed on May 5, 1999; U.S. Provisional Application No. 60/136,333, filed on May 26, 1999; U.S. Provisional Application No. 60/146,140, filed on Jul. 30, 1999; U.S. Provisional Application No. 60/159,588, filed on Oct. 18, 1999; U.S. Provisional Application No. 60/162,150, filed on Oct. 29,1999; and U.S. Provisonal Application No. 60/168,628, filed on Dec. 3, 1999, the disclosures of which are expressly incorporated by reference herein in their entirety.
activating station�the DTE, DCE and other associated terminal equipment which originates an activation of an xDSL service;
downstream�direction of transmission from the xTU-C to the xTU-R,
HSTU-C�handshaking portion of the xDSL central terminal unit (xTU);
PBO�Power Back Off,
PME�Power Management Exchange
PMM�Power Measurement Modulation;
PMMS�Power Measurement Modulation Session;
1) Recommendation V.8, entitled �Procedures For Starting Sessions Of Data Transmission Over The General Switched Telephone Network�, published in September, 1994; 2) Recommendation V.8bis, entitled �Procedures For The Identification And Selection Of Common Modes Of Operation Between Data Circuit-Terminating Equipments (DCEs) And Between Data Terminal Equipments (DTEs) Over The General Switched Telephone Network�, published in August, 1996; and 3) Recommendation G.994.1, entitled �Handshake Procedures For Digital Subscriber Line (DSL) Transceivers�, published in June 1999.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a uniform power measurement procedure that can be used for all xDSL schemes. Another object of the instant invention is to perform the uniform power measurement procedure prior to the selection of the specific xDSL scheme. The procedure of the instant invention may be implemented as an extension to an xDSL handshaking and selection procedure, such as, but not limited to, that shown in commonly assigned U.S. patent application Ser. No. 09/217,556 filed on Dec. 21, 1998 and/or U.S. patent application Ser. No. 09/281,813 filed on Mar. 31, 1999, and/or ITU-T Recommendation G.994. 1, published in June, 1999. Integrating the power control and measurement procedure with the xDSL selection procedure allows a more accurate selection of the particular xDSL modulation scheme, based on the power measurement results. The present invention also allows for a more accurate determination of the minimum needed frequency dependent transmission power during a data transmission mode.
Preferred embodiments are described in the context of a new message type, procedures, and associated transactions to a startup mechanism (such as, but not limited to, for example, the xDSL startup method defined in ITU-T Recommendation G.994.1). The new message type or session is correctively referred to as Power Measurement Modulation Session (PMMS) and/or �Power Management Exchange� (PME).
A first embodiment is described in the context of a new transaction to an xDSL startup mechanism (such as, but not limited to, for example, ITU-T Recommendation G.994.1, noted above). The new transaction is referred to as �Power Management Exchange� (PME). It is noted that the functionality and methodology of the PME is the same for other handshake procedures, such as, but not limited to, for example, ITU-T Recommendations V.8 and V.8bis.
TABLE 43 PMMS (Standard Measurements Procedure) Transmit Unit Name # Contents of octets HSTU-R MS 1 Table 37 x010 0000 (Select GVDSL) Table 38 xx00 0001 (start PMMS measurements) Table 39 xx00 0001 (all carriers) Table 40 N/A Table 41 N/A Table 42 N/A HSTU-C ACK 2 The message Acknowledges selection of PMMS HSTU-R PMRH 3 HSTU-C PMCH 4 HSTU-R MR 5 Request MS HSTU-C MS 6 Table 37 x010 0000 (Select GVDSL) Table 38 xx00 0010 (upstream PBO) Table 39 N/A Table 40 xx00 0110 (6 dB) Table 41 N/A Table 42 N/A HSTU-R ACK 7 The message Acknowledges the upstream PBO request value HSTU-C MS 8 Table 37 x010 0000 (Select GVDSL) Table 38 xx00 1100 (downstream PBO & initiate training) Table 39 N/A Table 40 xx00 0110 (6 dB) (repeat) Table 41 xx00 0111 (7 dB) Table 42 xxxx xxxx HSTU-C ACK 9 The message Acknowledges selection of the GDSL using the specified downstream PBO � Training � GDSL training begins. B. Fixed Measurement Signals with Explicit Parameters
PMCH �
PMRH �
TABLE 50 Second Example Of PMMS - Explicit Measurements Procedure Transmit Unit Name # Contents of octets HSTU-R MS 1 Table 37 x010 0000 (Select GVDSL) Table 38 xx00 0001 (start PMMS measurements with PMCH) Table 46 xx00 1001 (favorite carriers) Table 47 xx00 1001 (favorite carriers) Table 48 xx00 1001 (favorite carriers) Table 40 N/A Table 41 N/A Table 42 N/A HSTU-C ACK 1 This message Acknowledges selection of PMMS HSTU-C PMCH � This signal allows the HSTU-R to measure the line conditions and power loss HSTU-R MR 2 This message indicates the HSTU-R is done receiving PMCH and is a request the HSTU-C to send an MS HSTU-C MS 2 Table 37 x010 0000 (Select GVDSL) Table 38 xx00 0001 (start PMMS measurements with PMRH) Table 46 xx00 1001 (favorite carriers) Table 47 xx00 1001 (favorite carriers) Table 48 xx00 1001 (favorite carriers) Table 40 N/A Table 41 N/A Table 42 N/A HSTU-C ACK 2 This message Acknowledges selection of PMMS HSTU-R PMRH � This signal allows the HSTU-C to measure the line conditions and power loss HSTU-R MR 3 Request MS HSTU-C MS 3 Table 37 x010 0000 (Select GVDSL) Table 38 xx00 0010 (upstream PBO) Table 39 N/A Table 40 xx00 0110 (6 dB) Table 41 N/A Table 42 N/A HSTU-R ACK 3 The message Acknowledges the upstream PBO request value HSTU-C MS 4 Table 37 x010 0000 (Select GVDSL) Table 38 xx00 1100 (downstream PBO & initiate training) Table 39 N/A Table 40 xx00 0110 (6 dB) (repeat) Table 41 xx00 0111 (7 dB) Table 42 xxxx xxxx HSTU-R ACK 4 This message Acknowledges the downstream PBO request value � Training � GDSL training begins C. Stepped Measurement Signals With Standard Parameters
This scheme is similar to the Fixed Measurement Signals With Standard Parameters, described above, except that the PMX signal is stepped from low power to high power. The transmission power is continuously stepped (increased) until the opposite HSTU-X can receive sufficient power and sends an �Acknowledgment�. In the disclosed invention, the stepping occurs in 2 dB increments, starting from approximately −90 dBm/Hz every 200 ms; however, other stepping rates and timing values may be used without deviating from the spirit and/or scope of the invention.
The sequence of the transaction and signals is very similar to Table 32, above. An �ACKI� signal uses the same carriers as the handshake transaction and is inserted between the measurement signals as shown in Table 51, below, and illustrated in FIG. 7.
TABLE 51 PMMS (Stepped Standard Measurements) Message/ Transmit Signal Unit Name Description HSTU-R MS This message is a request for the HSTU-C and HSTU-R to send the power measurement modulation session (PMMS) signals (PMCH and PMRH), and includes the category choice which represents the parameters of the desired signal (PMCH and PMRH) to be transmitted. HSTU-C ACK This message Acknowledges selection of PMMS HSTU-R PMRH This signal allows the HSTU-C to measure the line conditions and power loss HSTU-C ACK This message acknowledge reception of PMRH and beginning of transmission of PMCH HSTU-C PMCH This signal allows the HSTU-R to measure the line conditions and power loss HSTU-R MR This message is a request to the HSTU-C to send an MS. HSTU-C MS This message conveys the upstream PBO request HSTU-R ACK This message Acknowledges the upstream PBO request value HSTU-C MS This message is a request for a specific xDSL modulation mode, and contains a parameter request for a certain amount of PBO in the downstream direction HSTU-C ACK This message Acknowledges selection of the xDSL using the specified downstream PBO � Training Training begins D. Stepped Measurement Signals with Explicit Parameters
This scheme is similar to the Fixed Measurement Signals With Explicit Parameters, described above, except that the PMX signal is stepped (incrementally increased) from a low power to a high power. The power stepping continues until the opposite HSTU-X can receive sufficient power and sends an �Acknowledgment�. In the disclosed invention, the stepping occurs in approximate 2 dB increments, starting from approximately −90 dBm/Hz every 200 ms; however, other stepping rates and timing values may be used without deviating from the spirit and/or scope of the invention.
Another �power measurement modulation� sequence that is similar to existing messages (e.g., derived from two existing messages) and transactions will now be described. This sequence of signals and transaction, which is referred to as a power measurement modulation session (PMMS), is comprised of two types of elements: (1) digital negotiation and control channels; and (2) power measurement signals. Parameters that describe power measurement signals are negotiated and indicated as messages in the negotiation and control channels of the PMMS. After the power measurement signals are received and analyzed, the preferred transmit levels are indicated in messages to the opposite side.
An overview of the contents of each message is given in Table 52, below. Note that �#� corresponds to the step number in FIG. 9.
In �revision 1� of ITU-T Recommendation G.994.1, a HSTU-X generating it's MS message contents does not need to consider an input from the opposite HSTU-X. In order to preserve backward compatibility with revision 1 of ITU-T Recommendation G.994.1, the current invention sets forth an explicit rule. This rule states that the contents of an MS message can �override� the parameters and mode suggested in MR-P, but it should do so cautiously, so as to avoid a NAK from the HSTU-R.
This means of operation assumes that a standard set of parameters for both upstream and downstream measurement signal characteristics is being requested. This can substantially shorten the length of the messages. The HSTU-R selects PMMS using a �parameter set� mode by setting a specific NPar(2) bit. The parameter set is requested through a SPar(2) octet and a NPar(3) octet.
The contents of the MS messages will be illustrated below using G.shdsl as an example; however, it is understood that the MS messages can be used for any of the various xDSL systems. In this regard, reference is made to ITU-Telecommunication Standardization Sector document entitled �G.shdsl Draft: Recommendation for G.shdsl� by Steve BLACKWELL, published in August, 1999 and assigned Temporary Document NG-R15X, the subject matter of which is expressly incorporated herein by reference in its entirety.
TABLE 60 PMMS - Standard Parameter Measurements Procedure Example Transmit Unit Name # Contents of octets HSTU-R MR-P 1 Table 53 x010 0000 (Select G.shdsl) Table 54 xx00 0010 (start PMMS measurements using set in Table 55) Table 55 xx00 0100 (downstream PMMS measurements using set in Table 59) Table 59 xx00 0001 (set #1) [downstream] HSTU-C MS 2 Table 53 x010 0000 (Select G.shdsl) Table 54 xx00 0010 (start PMMS measurements using set in Table 55) Table 55 xx00 1100 (downstream/downstream PMMS measurements using set in Table 59) Table 59 xx00 0001 (set #1) [downstream] Table 59 xx00 0001 (set #1) [upstream] HSTU-R ACK 3 This message Acknowledges selection of PMMS HSTU-C PMCH 4 HSTU-R PMRH 5 HSTU-R MR-P 6 Table 53 x010 0000 (Select G.shdsl) Table 54 xx00 0001 (Initiate training (using parameter values from Table 55) Table 55 xx00 0001 (Initiate training (using downstream parameter values from Tables 57 and 58) Table 56 xxxx xxxx General parameters ┌Table 57 xx00 0010 (128 kbit/s) [downstream] └Table 58 xx00 0110 (6 dB) [downstream] HSTU-C MS 7 Table 53 x010 0000 (Select G.shdsl) Table 54 xx00 0001 (Initiate training (using parameter values from Table 55) Table 55 xx00 0011 (Initiate training (using parameter values from Tables 57 and 58) Table 56 xxxx xxxx General parameters ┌Table 57 xx00 0010 (128 kbit/s) [downstream] └Table 58 xx00 0110 (6 dB) [downstream] ┌Table 57 xx00 0010 (128 kbit/s) [upstream] └Table 58 xx00 0110 (6 dB) [upstream] HSTU-R ACK 8 This message Acknowledges selection of the G.SHDSL using the specified downstream (an upstream) PBO � Training � G.SHDSL training begins. B. Explicit Parameter Measurements
The PMRH and PMCH signals may contain multiple signal segments. For example, several data rates for a given power level, or several power levels for a given data, may be sent to measure the PBO values. Thus, each segment is described with a �4-tuple� that comprises:
TABLE 67 PMMS (Explicit Measurements Procedure For PMMS Example) Transmit Unit Name # Contents of octets HSTU-R MR-P 1 Table 53 x010 0000 (Select G.shdsl) Table 54 xx00 0010 (start PMMS measurements using set in Table 55) Table 55 xx01 0000 (downstream PMMS measurements using explicit parameters in Table 61 and multiple copies of Tables 62, 64, 65, and 66) Table 61 xx00 0011 Number of segments [downstream] (e.g.: 3) ┌Table 62 xx10 0000 Data rate [downstream] (e.g.: 1024 kbit/s) |Table 64 xx00 1010 Power level [downstream] (e.g.: −10 dB) |Table 65 xx00 0001 Duration [downstream,] (e.g.: 20 ms) └Table 66 xx00 0100 Guard [downstream] (e.g.: 20 ms) ┌Table 62 xx10 0000 Data rate [downstream] (e.g.: 1024 kbit/s) |Table 64 xx01 0100 Power level [downstream] (e.g.: −20 dB) |Table 65 xx00 1010 Duration [downstream,] (e.g.: 200 ms) └Table 66 xx00 0100 Guard [downstream] (e.g.: 20 ms) ┌Table 62 xx00 1000 Data rate [downstream] (e.g.: 256 kbit/s) |Table 64 xx00 1010 Power level [downstream] (e.g.: −10 dB) |Table 65 xx00 0001 Duration [downstream,] (e.g.: 20 ms) └Table 66 xx00 0001 Guard [downstream] (e.g.: 20 ms) HSTU-C MS 2 Table 53 x010 0000 (Select G.shdsl) Table 54 xx00 0010 (start PMMS measurements using set in Table 55) Table 55 xx11 0000 (downstream and upstream PMMS measurements using explicit parameters in Table 61 and multiple copies of Tables 62, 64, 65, and 66) Table 61 xx00 0011 Number of segments [downstream] (e.g.: 3) ┌Table 62 xx10 0000 Data rate [downstream] (e.g.: 1024 kbit/s) |Table 64 xx00 1010 Power level [downstream] (e.g.: −10 dB) |Table 65 xx00 0001 Duration [downstream,] (e.g.: 20 ms) └Table 66 xx00 0100 Guard [downstream] (e.g.: 20 ms) ┌Table 62 xx10 0000 Data rate [downstream] (e.g.: 1024 kbit/s) |Table 64 xx01 0100 Power level [downstream] (e.g.: −20 dB) |Table 65 xx00 1010 Duration [downstream,] (e.g.: 200 ms) └Table 66 xx00 0100 Guard [downstream] (e.g.: 20 ms) ┌Table 62 xx00 1000 Data rate [downstream] (e.g.: 256 kbit/s) |Table 64 xx00 1010 Power level [downstream] (e.g.: −10 dB) |Table 65 xx00 0001 Duration [downstream,] (e.g.: 20 ms) └Table 66 xx00 0001 Guard [downstream] (e.g.: 20 ms) Table 61 xx00 0001 Number of segments [upstream] (e.g.: 1) ┌Table 62 xx10 0000 Data rate [upstream] (e.g.: 1024 kbit/s) |Table 64 xx00 1010 Power level [upstream] (e.g.: −10 dB) |Table 65 xx00 0001 Duration [upstream,] (e.g.: 20 ms) └Table 66 xx00 0100 Guard [upstream] (e.g.: 20 ms) HSTU-R ACK 3 This message Acknowledges selection of PMMS HSTU-C PMCH 4 HSTU-R PMRH 5 HSTU-R MR-P 6 (same as example in Table 60, above) HSTU-C MS 7 (same as example in Table 60, above) HSTU-R ACK 8 (same as example in Table 60, above) � Training � G.SHDSL training begins. Fifth Embodiment
Some (but not all possible) non-typical transaction scenarios will now be discussed. State diagrams, using ITU-T Recommendation G.994.1 as an example for the HSTU-R and HSTU-C, are shown in FIGS. 11 and 12, respectively, which show �legal� state transitions. New components are shown in bold. Note that message names shown in FIGS. 11 and 12 that are followed by an asterisk (*) indicate that the state transition may be taken upon reception of a complete message, or upon the reception of one or more segments of the message.
If the MR-P message were to become lengthy, it would need to be segmented Segmenting the MR message was not necessary since it could not contain any parameters and was always of short length. Thus, the segment acknowledge command �ACK(2)� must be allowed.
As the new message MR-P carries a higher revision level that the existing equipment, the message NAK-NS may be a response to an MR-P to say the message�type�is not supported. However, NAK-NS cannot mean the requested parameters are not supported, since they can be overridden by the MS message.
Since no mode is being selected (e.g., a mode is only being requested), �ACK(1)� is not an appropriate response. Since NAK-NR is not sent in response to a CLR, it also should not be sent in response to an MR-P. Similarly, sending Request MR in response to a �REQ-MR� message would be a meaningless response to an MR or MR-P message.
Since message MR-P is related to MR, it should have a related message number. All of the bits except bit 3 are the same between MR and MR-P. Bit 3 is set to a �1� to indicate MR-P instead of MR, as shown in Table 69, below.
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Krechmer at pp. 63, 64 and 66 of Data Communications, McGraw Hill, NY, vol. 23, no. 2 (Jan. 21, 1994), entitled "V.34 Modems: Off to a Fast Start?".6English Language Abstract of JP 6-97980.7ITU-T recommendation G.994.1 ("Handshake Procedure For Digital Subscriber Line (DSL) Transceivers"), published by the International Telecommunication Union in Feb., 2001.8ITU-T Recommendation V.8 bis ("Procedure for the Identification and Selection of Common Modes of Operation Between Data Circuit-Terminating Equipments (DCEs) and Between Data Terminal Equipments (DTEs) Over the General Switched Telephone Network and On Leased Point-to-Point Telephone-Type Circuits"), published by the International Telecommunication Union in Aug. 1996.9ITU-T Recommendation V.8 bis ("Procedures for the Identification and Selection of Common Modes of Operation Between Data Circuit-Terminating Equipment (DCEs) and Between Data Terminal Equipments (DTEs) Over the General Switched Telephone Network and On Leased Point-to-Point Telephone-Type Circuits"), which was published by the International Telecommunication Union in Aug., 1996.Classifications U.S. Classification375/222International ClassificationH04L5/14, H04L5/02, H04L1/24Cooperative ClassificationH04L5/023, H04L5/1438, H04L1/24European ClassificationH04L5/14R, H04L1/24, H04L5/02QLegal EventsDateCodeEventDescriptionJun 28, 2013ASAssignmentOwner name: MATSUSHITA GRAPHIC COMMUNICATION SYSTEMS, INC., JAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PALM, STEPHEN;REEL/FRAME:030709/0601Effective date: 20000504Owner name: PANASONIC COMMUNICATIONS CO., LTD., JAPANFree format text: MERGER;ASSIGNOR:MATSUSHITA GRAPHIC COMMUNICATIONS SYSTEMS, INC.;REEL/FRAME:030710/0192Effective date: 20030106Owner name: PANASONIC SYSTEM NETWORKS CO., LTD., JAPANFree format text: CHANGE OF NAME;ASSIGNOR:PANASONIC COMMUNICATIONS CO., LTD.;REEL/FRAME:030710/0230Effective date: 20100112Dec 19, 2012FPAYFee paymentYear of fee payment: 8Dec 11, 2008FPAYFee paymentYear of fee payment: 4Dec 20, 2005CCCertificate of correctionRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google