JP2015177532A - Power control device and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to determine a value of a practicable short power-on delay time on the basis of a value of power saving information negotiated by an OLT and an ONU.SOLUTION: A power control device controls the power state of a communication device of itself to an active state or a sleep state in coordination with a master station device. The power control device comprises: power saving setting means for setting power saving information indicating time of the active state or the sleep state by negotiation with the master station device; and power-on delay time determining means for variably determining a power-on delay time to return from the sleep state to the active state on the basis of the power saving information set by the power saving setting means.

Description

  The present invention relates to a power control device and a communication device, and can be applied to a communication device constituting an optical communication network such as an E-PON (Ethernet (registered trademark) Passive Optical Network).

  For example, using an E-PON type topology such as a one-to-n connection (where n is an integer), an ONU (Optical Subscriber Line Terminator: Optical) is linked with an OLT (Optical Line Terminal). There is a method of performing power saving of Network Unit).

  ONU is defined in IEEE P1904.1 Draft 3.2 (hereinafter referred to as SIEPON) as a method for performing power saving in cooperation with OLT. According to this specification, when there is no upstream frame from the ONU to the OLT direction (upstream direction), the Tx power down mode in which the ONU transmission function is stopped and power saving is performed, the downstream frame from the OLT to the ONU direction (downstream), and There is a TRx power-down mode that performs power-down of both ONU transmission function and reception function when there is no upstream frame. These Tx power down mode and TRx power down mode are realized by controlling the ONU in cooperation with the OLT (see, for example, Patent Document 1).

  The TRx power down mode will be described with reference to the sequence diagram of FIG. FIG. 2 shows a state transition diagram of the power saving sequence in the OLT and the ONU.

  The transition from the active mode in which the ONU performs the normal operation without power down to the sleep mode in which the ONU performs the power down is, for example, when the continuity of the upstream frame and the downstream frame is lost in the frame continuity monitoring in the OLT. In addition, the OLT sends a SLEEP_ALLOW (TRx) message to the ONU. The ONU that has received the SLEEP_ALLOW (TRx) message responds with a SLEEP_ACK (TRx) message and transitions to the sleep mode if there is no uplink frame to be transmitted and the state can be shifted to the sleep mode.

  In the sleep mode, there is a time T1 (hereinafter also referred to as active duration) in which a signal from the OLT can be transmitted and received before the power down at the ONU is performed.

  After T1 time has elapsed, the ONU is actually only T2-T3 time (ie, T2 (hereinafter also referred to as sleep duration, sleep duration) time minus T3 (hereinafter also referred to as powerOnDelay, power-on delay time)). Perform power down. Here, the T3 time is a time required to return the ONU that has actually been powered down to the normal state, and the power down is not performed during the T3 time.

  After the time T2-T3 has elapsed, the ONU transitions again to the above-described T1 after the time T3, and thereafter, the sleep mode is performed repeatedly.

  On the other hand, the ONU has an Early Wakeup function. When an upstream frame is received from the ONU's UNI (User Network Interface) during T2-T3 time, and when the Early Wakeup function is ONU, the sleep mode T2 -Even if the power-down is being performed at T3 time, the power-down is interrupted, and immediately after the T3 timer is started and the T3 time expires, SLEEP_ACK (wakeup) is transmitted to the OLT, thereby operating as an active mode.

  Conversely, when the OLT detects a frame addressed to the ONU or all ONUs that are to be sleep during the sleep mode, it transmits SLEEP_ALLOW (wakeup), and the ONU that received this during the T1 time when the ONU can be transmitted and received. Transitions to the active mode by transmitting SLEEP_ACK (wakeup).

  As described above, the SLEEP_ALLOW message and the SLEEP_ACK message used for performing power saving in cooperation between the OLT and the ONU are exchanged in units of LLIDs. The timer value of active Duration (T1) and sleep Duration (T2) necessary for power saving and Enable or Disable of the EasyWakeUp function are preliminarily saved between the OLT and ONU using the extended OAM (Operations, Administration and Maintenance). It is common to decide before the start of

  Among these parameters, powerOnDelay (T3) is the time required to return the ONU that has actually been powered down to the normal state as described above. Therefore, it does not operate with the timer value instructed by the OLT, but is assumed to be possessed by each ONU. Generally, an ONU has two types, a Tx power down mode and a TRx power down mode.

JP 2011-223437 A

IEEE (Institute of Electrical and Electronics Engineers), IEEE Std 802.3av-2009 IEEE (Institute of Electrical and Electronics Engineers), IEEE P1904.1 D3.2

  By the way, in order to normally receive the signal from the OLT, the ONU extracts the frequency component using the signal converted from the received optical signal into the electrical signal by the optical module.

  The ONU uses the frequency extracted from the frequency component as an input clock, and synchronizes it with a clock obtained by extracting its own frequency by a PLL (Phase Locked Loop).

  With these operations, the ONU can normally identify and reproduce the electrical signal received from the OLT.

  On the other hand, the ONU that implements the TRx power-down mode is a function that is connected to the PON interface at T2-T3 time according to the power-saving state transition, and implements power-down including optical modules with large power consumption. To do.

  Here, the receiving part including the optical module is also powered down. Therefore, since the optical signal from the OLT is not normally converted into an electric signal, the clock component cannot be extracted, and as a result, synchronization with the OLT in the PLL is lost.

  Therefore, the PLL has a time required to synchronize with the input clock, that is, a time constant, and this time constant generally has an equivalent time even when the synchronization is lost when the input signal is lost.

  When recovering from the power-down mode, the power on delay time is set in advance for each ONU in consideration of the time until the PLL is synchronized and can be normally received.

  For example, when the optical signal interruption time is short and the optical signal is restored again, that is, when the sleep Duration is short, it is possible to restore the normal state with a small frequency width from which the PLL is removed. For this reason, the power on delay time required to restore normal operation may be short. However, conversely, when sleep Duration is long, powerOnDelay is also required to be long.

  According to SIEPON, the sleep Duration is set to operate from a value less than 1 second from the OLT. On the other hand, generally, only one power-on delay time is set for the ONU, and the ONU is set so that the recovery can be performed even when the sleep Duration is maximum.

  As described above, for example, since the recovery time is constant even in the case of a short sleep Duration, there is a disadvantage that not only the power saving effect is reduced, but also the delay is increased even when the EasyWakeUp function is used for a long power-on delay.

  Therefore, in view of the above problems, the present invention implements power-down that can determine and use the shortest possible powerOnDelay value based on the values of activeDuration and sleepDuration negotiated by the OLT and ONU. It is an object of the present invention to provide a power control device and a communication device capable of performing the above.

  In order to solve such a problem, the first aspect of the present invention provides a power control device that controls the power state of its own communication device in an active state or a sleep state in cooperation with the parent station device. Power saving setting means for setting power saving information indicating a time period for setting the active state and / or the sleep state by negotiation with the station apparatus, and (2) sleep based on the power saving information set by the power saving setting means. A power control apparatus comprising: a power-on delay time determining unit that variably determines a power-on delay time until the state is returned to the active state.

  A second aspect of the present invention is a communication apparatus that transmits and receives communication signals to and from a master station apparatus, and includes the power control apparatus according to the first aspect of the present invention.

  According to the present invention, based on the values of active Duration and sleep Duration negotiated between the OLT and the ONU, it is possible to determine the shortest possible power OnDelay value and implement power-down that can be used.

1 is an overall configuration diagram showing an overall configuration of an optical communication network system according to an embodiment. The state transition diagram of the power saving sequence in OLT and ONU is shown. It is an internal block diagram which shows the internal structure of OLT which concerns on embodiment. It is an internal block diagram which shows the internal structure of ONU which concerns on embodiment. It is explanatory drawing explaining the connection procedure from the connection start of OLT and ONU which concerns on embodiment. It is explanatory drawing explaining the operation | movement in ONU after the power negotiation which concerns on embodiment. It is a block diagram which shows the structural example of the powerOnDelay table which concerns on embodiment. It is a block diagram explaining the function of CPU of ONU which concerns on embodiment.

(A) Main Embodiments Hereinafter, main embodiments of a power control device and a communication device according to the present invention will be described in detail with reference to the drawings.

  In this embodiment, for example, a case where the present invention is applied to an ONU that uses an E-PON type topology such as a one-to-n connection (n is an integer) and performs power saving of the ONU in cooperation with the OLT. Illustrate.

(A-1) Configuration of Embodiment FIG. 1 is an overall configuration diagram showing an overall configuration of an optical communication network system 1 according to an embodiment.

  In FIG. 1, the optical communication network system 1 can be, for example, an E-PON having a 1: n connection. As shown in FIG. 1, the optical communication network system 1 is a Point to Multi Point type optical subscriber network system in which one OLT 10 and a plurality of ONUs 20 are connected by optical fibers and an optical splitter 30.

  The operation when communicating between the OLT 10 and the ONU 20 is standardized by IEEE 802.3ah and IEEE 802.3av (American Institute of Electrical and Electronics Engineers).

  The ONU 20 is an optical subscriber line terminating device, and is logically identified by an LLID (Logical Link ID).

  Since the downstream signal from the OLT 10 to the ONU 20 is branched by the optical splitter 30 and reaches all the ONUs 20, the ONU 20 receives the LLID addressed to itself or the LLID addressed to all (Broadcast LLID), and discards the LLID addressed to others. To do.

  Further, the upstream signal from the ONU 20 to the OLT 10 is a multiplexing type TDMA (Time Division Multiple Access) in which the frame transmission time is divided and shared by a plurality of users, so that the frame transmitted from each ONU 20 is an optical signal. Since the signals are multiplexed by the splitter 30, a collision occurs unless the transmission timing of the optical signal transmitted from each ONU 20 is controlled.

  Here, as a method for avoiding a collision, the OLT 10 instructs each ONU 20 of the transmission timing and the transmission length, and the ONU 20 avoids the collision by transmitting according to the instruction.

  FIG. 3 is an internal configuration diagram illustrating an internal configuration of the OLT 10 according to the embodiment. In FIG. 3, the OLT 10 according to this embodiment includes an NI-side transmitting / receiving unit 101, a bridge unit 102, an OAM transmitting / receiving unit 103, an MPCP transmitting / receiving unit 104, a CPU 105, a RAM 106, a ROM 107, a PON transmitting unit 108, a PON receiving unit 109, and a PON light. A transmission / reception unit 110 is included.

  The NI side transmission / reception unit 101 transmits / receives an Ethernet frame, which is user data, from an upper network.

  The bridge unit 102 determines the LL ID on the PON side to transfer the frame from the NI side transceiver unit 101 to the transfer destination from the MAC (Media Access Control) address and VLAN (Virtual Local Area Network or Virtual LAN) information. An address learning function for determining the above, a function for conducting continuity monitoring of upper and lower frames for each LLID, a VLAN-Tag addition deletion for VLAN identification, a buffer for priority processing and LLID identification.

  The MPCP transmission / reception unit 104 transmits / receives a control frame necessary for establishing a link of the PON interface, a SLEEP_ALLOW message, a SLEEP_ACK message, etc. for implementing the sleep function.

  The OAM transmitting / receiving unit 103 transmits an OAM frame to set a timer value necessary for the ONU 20 to execute the sleep mode, and receives an OAM frame from which the state of the ONU 20 is read.

  The PON transmission unit 108 controls the user data from the bridge unit 102, the OAM frame from the OAM transmission / reception unit 103, and the MPCP frame from the MPCP transmission / reception unit 104, and transmits them to the PON optical transmission / reception unit 110.

  The PON receiving unit 109 receives and identifies user data and PON control frames from the PON optical transmission / reception unit 110, and transmits the received user data and PON control frames to the MPCP transmission / reception unit 104, the OAM transmission / reception unit 103, and the bridge unit 102. It is something to distribute.

  The PON optical transmission / reception unit 110 converts the electrical signal from the PON transmission unit 108 into an optical signal and transmits it to the PON interface, or converts the optical signal from the PON interface into an electrical signal and transmits it to the PON reception unit 109. To do.

  The RAM 106 temporarily stores data necessary for program execution of the CPU 105 and DBA arithmetic processing.

  The ROM 107 stores a device activation program, a DBA processing program, setting values, and the like of the OLT 10.

  The CPU 105 manages the functions of the OLT 10. The CPU 105 performs various settings and data reading. The CPU 105 performs various processes of the OLT 10 by reading a program stored in the ROM 107 and executing the program using data stored in the RAM 106.

  The CPU 105 is connected to each unit including the MPCP transmission / reception unit 104, manages the power saving state transition of each ONU 20 based on the power saving message information of each ONU 20 collected from the MPCP transmission / reception unit 104, and the bridge unit 102. On the basis of the frame monitoring state, power saving information to be instructed to the ONU 20 is determined, and a function of transmitting a power down message to the MPCP transceiver 104 is provided.

  FIG. 4 is an internal configuration diagram showing the internal configuration of the ONU 20 according to this embodiment. 4, the ONU 20 according to the embodiment includes a UI-side transceiver unit 201, a bridge unit 202, an OAM transceiver unit 203, an MPCP transceiver unit 204, a CPU 205, a RAM 206, a ROM 207, a PON transmission unit 208, a PON reception unit 209, and a PON optical transmission / reception. Part 210.

  The UI-side transmission / reception unit 201 transmits / receives an Ethernet frame that is user data from the user network.

  The bridge unit 202 performs buffer transfer to the PON side, VLAN-Tag addition / deletion for VLAN identification, address learning, priority processing, etc., and continuity monitoring of upstream and downstream frames.

  The MPCP transmission / reception unit 204 transmits / receives a control frame necessary for link establishment of the PON interface, a SLEEP_ALLOW message, a SLEEP_ACK message, etc. for implementing the sleep function for controlling the PON interface.

  The OAM transmission / reception unit 203 transmits an OAM frame including the state of the ONU 20 and receives an OAM frame related to setting of a timer value and the like necessary for implementing the sleep mode from the OLT 10.

  The PON transmission unit 208 supplies PON control frames such as user data, MPCP frames, and OAM frames to the PON optical transmission / reception unit 210.

  The PON reception unit 209 receives and identifies user data and PON control frames from the PON optical transmission / reception unit 210, and distributes user data and PON control frames to the MPCP transmission / reception unit 204, the OAM transmission / reception unit 203, and the bridge unit 202. It is.

  The PON optical transmission / reception unit 210 converts the electrical signal from the PON transmission unit 208 into an optical signal and transmits it to the PON interface, or converts the optical signal from the PON interface into an electrical signal and transmits it to the PON reception unit 209. To do.

  The RAM 206 temporarily stores data necessary for program execution and processing of the CPU 205.

  The ROM 207 stores programs, various setting values, and a powerOnDelay table for determining powerOnDelay values.

  The CPU 205 manages the functions of the ONU 20. The CPU 205 performs various settings and data reading. The CPU 205 reads out a program stored in the ROM 207 and executes various processes of the ONU 20 by executing the program using data stored in the RAM 206. The CPU 205 is connected to each component of the ONU 20 illustrated in FIG. 4 and controls each component.

  FIG. 8 is a block diagram illustrating a function of the CPU 205 as a power control device according to the embodiment. As shown in FIG. 8, the CPU 205 of the ONU 20 according to this embodiment includes a power saving information setting unit 31, a power-on delay time determination unit 32, a message transmission unit 33, and a power-down instruction unit 34.

  The power saving information setting unit 31 is a functional unit that acquires information related to power saving acquired by the OAM transmission / reception unit 203 with the OLT 1 through power saving negotiation described later.

  Here, the power saving information is information acquired by the OAM transmission / reception unit 203 from the OLT 10 using the OAM frame, and is information related to power saving. Specifically, the power saving information can be values of active Duration (T1 time) and sleep Duration (T2 time).

  The power-on delay time determination unit 32 has a function of determining the minimum usable powerOnDelay based on the power saving information determined by the power saving information setting unit 31 through the power saving negotiation and the powerOnDelay table stored in the ROM 207. Part.

  The message transfer unit 33 manages the power saving state transition based on the power saving message information collected from the MPCP transmission / reception unit 204, and responds to the OLT 10 from the continuity monitoring state of the uplink frame and the downlink frame of the bridge unit 202. This is a functional unit that determines saving information and transmits a message to the MPCP transmission / reception unit 204.

  The power-down instruction unit 34 is a functional unit that instructs power-down information to the OAM transmission / reception unit 203, the MPCP transmission / reception unit 204, the PON transmission unit 208, the PON reception unit 209, the PON optical transmission / reception unit 210, and the like. In response to an instruction from the power-down instruction unit 34, each component that has been instructed to power-down can be powered down.

  The power-down instruction unit 34 also has a function of monitoring the frame monitoring information input from the UNI transmission / reception unit 201 and input to the buffer unit 202, and handling it as a trigger when the power-down state transition is changed or the EarlyWakeup function is enabled. .

(A-2) Operation of Embodiment FIG. 5 is an explanatory diagram illustrating a connection procedure from the start of connection of the OLT 10 and the ONU 20 according to this embodiment.

  In FIG. 5, the OLT 10 and the ONU 20 are connected through, for example, an MPCP DISCOVERY process (S101) and an OAM DISCOVERY process (S102) indicated by IEEE 802.3av std and IEEE 802.3ah std.

  Further, the OLT 10 and the ONU 20 may be connected, for example, by performing an authentication process (S103) shown in IEEE P1904.1 Draft 3.2 if necessary.

  Thereafter, regarding power saving shown in IEEE P1904.1 Draft 3.2, the ONU 20 performs reading of an executable power saving function and setting for implementing the power saving function using the extended OAM (S104).

  Here, this is referred to as power saving negotiation. In the power saving negotiation, time settings of active Duration (T1 time) and sleep Duration (T2 time) are also performed.

  Next, the operation of the ONU 20 after completion of power saving negotiation will be described with reference to FIG. FIG. 6 is an explanatory diagram for explaining the operation of the ONU 20 after completion of power negotiation according to the embodiment.

  The ONU 20 performs power saving negotiations with the OLT 10, and as power saving information, one or both of the values of active Duration (T1 time) and sleep Duration (T2 time) are set (S201).

  In the power saving negotiation, the CPU 205 refers to the powerOnDelay table stored in the ROM 207 every time one or both of the active duration (T1 time) setting and the sleep Duration (T2 time) setting are set. Then, the value of powerOnDelay is determined each time (S203).

  Here, FIG. 5 and FIG. 6 illustrate a case where power saving negotiation is performed when connection between the OLT 10 and the ONU 20 is started. However, power saving negotiation is not limited to when connection is started.

  For example, active Duration (T1 time) and sleep Duration (T2 time) may be arbitrarily changed according to an instruction from the OLT 10.

  This function of the CPU 205 of the ONU 20 performs the resetting with reference to the powerOnDelay table in the same manner when the activeDuration (T1 time) and / or the sleepDuration (T2 time) are reset.

  From the values of active Duration (T1 time) and sleep Duration (T2 time) set in this way, it is possible to recover from the power-down state to the normal state in accordance with the PLL characteristics and CDR characteristics of the ONU 20, and the minimum powerOnDelay (T3 time) Can be determined with reference to the powerOnDelay table.

  FIG. 7 is a configuration diagram illustrating a configuration example of a powerOnDelay table according to the embodiment.

  The powerOnDelay table illustrated in FIG. 7 includes “NO.”, “SleepDuration”, “ActiveDuration”, and “PowerOnDelay” as items.

  The CPU 205 refers to the powerOnDelay table illustrated in FIG. 7 and takes a value less than or equal to the value described in the column “ActiveDuration” of the powerOnDelay table with respect to the set activeDuration (T1 time).

  Further, the CPU 205 takes a value greater than the value described in the “SleepDuration” column of the powerOnDelay table for the set sleepDuration (T2 time).

  That is, using the example of FIG. 7, it is assumed that “active Duration = 15 mS” and “sleep Duration = 890 mS” are set. At this time, the CPU 205 determines “powerOnDelay” with reference to “powerOnDelay = 97 mS”, which is “NO. 101” in the powerOnDelay table.

  The conventional ONU uses a fixed powerOnDelay (T3 time) regardless of the set values of active Duration (T1 time) and sleep Duration (T2 time). For this reason, the T2-T3 time, which is the actual power-down, is extremely reduced, and not only the power saving effect is reduced, but in the example of FIG. Become. Therefore, when the sleep Duration setting value is 100 mS or less, it means that the power cannot be reduced at all.

  That is, using the example of FIG. 7, if “active Duration = 10 mS” and “sleep Duration = 100 mS” are set, the maximum value is required to satisfy all combinations in the case of the fixed power-on delay of the prior art. Therefore, “powerOnDelay = 100 mS” is obtained. On the other hand, according to this embodiment, “powerOnDelay = 10 mS”.

  As described in the background art, for example, when power saving is repeatedly performed, power consumption when performing power-down with “active Duration = Ta”, “sleep Duration = Ts”, and “power On Delay = Tp” is set to Pp, a normal state If the power consumption of Pn is Pn, the ratio of the power saving effect is expressed by the equation (1).

Ratio of power saving effect = (Ts−Tp) / (Ta + Ts) (1)
In the case of the conventional fixed power-on delay, the ratio of the power saving effect is (100−100) / (10 + 100) = 0 from the formula (1), and there is no power saving effect. Furthermore, the power ratio is Pp: Pn = 0: 100.

  On the other hand, in the case of this embodiment, the ratio of the power saving effect is (100−10) / (10 + 100) = 0.8181, which is a ratio of the power saving effect of about 82%. In other words, during sleep, the power saving effect occurs at a ratio of Pp: Pn = 82: 18.

  In addition, due to the characteristics of operation, frame conduction during sleep is not possible particularly in the TRx sleep mode. Therefore, when a conduction frame occurs, increasing the sleep Duration increases the delay time because the frame conduction is performed after the ONU is once returned to the normal state.

  However, according to this embodiment, since powerOnDelay is set according to sleepDuration, it is possible to set a finer sleepDuration, which is effective in shortening the delay time.

(A-3) Effect of Embodiment As described above, according to this embodiment, the shortest powerOnDelay value that can be implemented is determined and used based on the values of active Duration and sleep Duration negotiated by the OLT and the ONU. The power down that can be performed can be implemented.

(B) Other Embodiments Although various modified embodiments have been mentioned in the above-described embodiments, the present invention can also be applied to the following modified embodiments.

(B-1) In the above-described embodiment, the description is made with reference to the powerOnDelay table when the active Duration and the sleep Duration are set. However, this is originally a case where each combination is difficult to determine uniquely, and the combination of active Duration and sleep Duration can be performed with an arbitrary function, or a fixed value can be taken if it is greater than or less than a set value. If it can be determined uniquely, it can be determined without using a table such as the powerOnDelay table.

(B-3) Also, when a component such as an optical module uses a plurality of types and can take different power-on delay values, the component identification such as the optical module is performed using the control interface when the device power is turned on. It is easily conceivable to refer to the powerOnDelay table corresponding to each optical module type.

(B-3) In the above-described embodiment, the optical communication network system is an E-PON. The present invention is not limited to the E-PON, and the present invention is widely applied to ONUs constituting the PON system. can do.

  DESCRIPTION OF SYMBOLS 1 ... Optical communication network system, 10 ... OLT, 20 ... ONU, 201 ... UI side transmission / reception part, 202 ... Bridge part, 203 ... OAM transmission / reception part, 204 ... MPCP transmission / reception part, 205 ... CPU, 206 ... RAM, 207 ... ROM , 208... PON transmission unit, 209... PON reception unit, 210... PON optical transmission / reception unit, 31... Power saving information setting unit, 32... Power-on delay time determination unit, 33.

Claims (4)

In the power control device that controls the power state of its own communication device to the active state or the sleep state in cooperation with the master station device,
Power saving setting means for setting power saving information indicating the time to be active and / or sleep by negotiation with the master station device;
A power-on delay time determining unit that variably determines a power-on delay time from the sleep state to the return to the active state based on the power saving information set by the power saving setting unit. Power control device.   2. The power-on delay time determining unit determines a power-on delay time that decreases a delay time based on the power saving information set by the power saving setting unit. Power control device. Storage means for storing a power-on delay time setting table in which the power saving information and the power-on delay time set in advance are associated with each other;
2. The power-on delay time determining means refers to the power-on delay time setting table and determines a power-on delay time corresponding to the set power saving information. 2. The power control apparatus according to 2.   A communication apparatus that transmits and receives communication signals to and from a master station apparatus, comprising the power control apparatus according to claim 1.

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