JP2014212367A - Communication system - Google Patents

Communication system Download PDF

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JP2014212367A
JP2014212367A JP2013086242A JP2013086242A JP2014212367A JP 2014212367 A JP2014212367 A JP 2014212367A JP 2013086242 A JP2013086242 A JP 2013086242A JP 2013086242 A JP2013086242 A JP 2013086242A JP 2014212367 A JP2014212367 A JP 2014212367A
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Japan
Prior art keywords
frame
communication device
buffer
state
ta
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JP5969424B2 (en
Inventor
健吾 室田
Kengo Murota
健吾 室田
良 小山
Ryo Koyama
良 小山
美穂 竹原
Miho Takehara
美穂 竹原
三好政宏
Masahiro Miyoshi
政宏 三好
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西日本電信電話株式会社
Nippon Telegraph & Telephone West Corp
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Publication of JP2014212367A publication Critical patent/JP2014212367A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]

Abstract

Power saving of a communication apparatus.
A sleep setting unit 13 of an optical line termination device 1 stores parameters for determining the timing of transition between a sleep state and an active state in a gateway device 2. The state calculation unit 14 determines whether the gateway device 2 is in the sleep state or in the active state based on the parameter and the transmission time when the frame is transmitted to the gateway device 2. If it is determined that the gateway device 2 is in the active state, the frame processing unit 15 transmits the frame to the gateway device 2, while if it is determined that the gateway device 2 is in the sleep state, the frame processing unit 15 stores the frame in the buffer 11 and, for example, When a predetermined time elapses, the frame is read from the buffer 11 and transmitted to the gateway device 2.
[Selection] Figure 1

Description

  The present invention relates to a technology for saving power in a communication device.

  Conventionally, there is a technology for obtaining a power saving effect by setting a part of functions of a communication device to a sleep state.

  FIG. 8 shows the communication device 1A and the communication device 2A. For example, the communication device 1A operates as shown in FIG.

  That is, as shown in FIG. 9A, the communication device 1A repeats the sleep state S and the active state A over time, and in the sleep state S, the frame processing function from the communication device 2A is changed to the active state A. Compared to lower power.

  Further, the communication device 1A is in the active state A for a certain period from the time t0 when the upstream frame is received, regardless of the timing shown in FIG. 9A (FIG. 9B).

  For example, the communication device 1A performs the state transition as described above under its own control. Such autonomous control can omit the communication time of the control signal related to the state transition with the outside, and can shorten the delay, compared with the control from the outside (for example, the communication device 2A).

JP 2012-186601 A JP 2011-501369 A JP 2011-259057 A

  As described above, in the related art, the communication device is in a sleep state and can obtain a power saving effect, but there is a demand for further enhancing the power saving effect.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique for reducing the power consumption of a communication device.

  In order to solve the above problems, the present invention is a communication system including two communication devices, one transmitting a frame with the other as a partner and the other transmitting a frame with the other as a partner. The apparatus includes a buffer, a sleep setting unit in which a parameter for determining a transition timing between the sleep state and the active state in the partner communication apparatus is stored, and a transmission time of the parameter and the frame to the partner communication apparatus A state calculation unit that determines whether the partner communication device is in a sleep state or an active state, and if the partner communication device is in an active state, the frame to be transmitted to the partner communication device. While transmitting to the counterpart communication device, if the counterpart communication device is in a sleep state, store it in the buffer, Characterized in that the serial buffer and a frame processing unit for transmitting to the communication device of the other party reads the frame.

  For example, if the buffer is full, the frame processing unit transmits the frame to the counterpart communication device without storing the frame in the buffer.

For example, the sleep setting unit includes an active state start time ta that is a start time of one active state when the counterpart communication device repeats an active state and a sleep state, a time length Ta of the active state, The time length Ts of the sleep state and the time length Tb of the certain period when the partner communication apparatus is in the active state after receiving the frame are stored, and the state calculation unit When the transmission time of the frame to the communication device is t0, it is determined that the partner communication device is in the active state if the current time t satisfies one of the following two formulas, and is in the sleep state if not satisfied.
ta + n (Ta + Ts) <t <ta + n (Ta + Ts) + Ta
(Where n is 0 or a positive integer)
t0 <t <t0 + Tb

  For example, if the counterpart communication device is in a sleep state, the state calculation unit calculates a time length until the counterpart communication device becomes active based on the parameter and the transmission time, and When a time corresponding to the time length has elapsed, the processing unit reads the frame from the buffer and transmits it to the counterpart communication device.

For example, the sleep setting unit includes an active state start time ta that is a start time of one active state when the counterpart communication device repeats an active state and a sleep state, a time length Ta of the active state, The time length Ts in the sleep state and the time length Tb of the certain period when the partner communication apparatus is in the active state after receiving the frame are stored, and the state calculating unit Assuming that t0 is the current time and t is the current time, the time length T in the following equation is calculated as the time length until the partner communication device becomes active.
T = ta + (n + 1) (Ta + Ts) -t
(Where n is 0 or a positive integer, and n satisfies the following formula)
ta + Ta + n (Ta + Ts) <t <ta + (n + 1) (Ta + Ts)

  For example, when the buffer becomes full, the frame processing unit reads the frame from the buffer and transmits it to the counterpart communication device.

  For example, the frame processing unit transmits a frame having a high priority out of two types of frames having different priorities to the partner communication device without storing the frame in the buffer, and transmits a frame having a low priority to the partner communication. If the device is in the active state, it transmits to the partner communication device, while if the partner communication device is in the sleep state, the low priority frame is stored in the buffer and the buffer is full. Then, the low priority frame is read from the buffer and transmitted to the counterpart communication device.

  According to the communication system of the present invention, the communication device can save power.

It is a figure which shows the network structure and apparatus structure of the communication system which concern on this Embodiment. It is a figure which shows the state transition of the processing function of the frame in the optical line terminal device 1 and the gateway apparatus 2. FIG. 4 is a flowchart of an operation performed by the optical line termination device 1 for each downlink frame in the first embodiment. 4 is a flowchart of an operation performed on each downlink frame stored in a buffer 11 by the optical line termination device 1 according to the first embodiment. 6 is a flowchart of an operation performed by the optical network unit 1 for each downlink frame in the second embodiment. 6 is a flowchart of an operation performed on each downlink frame stored in a buffer 11 by the optical line termination device 1 according to the second embodiment. 12 is a flowchart of an operation performed on each downlink frame stored in a buffer 11 by the optical line termination device 1 according to the third embodiment. It is a figure which shows the connection state of conventional communication apparatus 1A and communication apparatus 2A. It is a figure which shows the state transition of the processing function of the flame | frame in the communication apparatus 1A and the communication apparatus 2A.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a network configuration and a device configuration of a communication system according to the present embodiment. FIG. 2 is a diagram showing the state transition of the frame processing function in the optical line terminating device 1 and the gateway device 2.

  As shown in FIG. 1, the communication system includes two communication devices, one of which transmits a frame with the other as a partner and the other transmits a frame with the other as a partner. Here, one is an optical line terminating device 1 and the other is a gateway device 2.

  The optical line termination device 1 receives a frame (downlink frame) transmitted from a wide area network (not shown) or the like and transfers it to the gateway device 2. The gateway device 2 receives the frame and transfers it to a terminal (not shown) of a local area network (LAN).

  Further, the gateway device 2 receives a frame (uplink frame) transmitted from a terminal or the like and transfers it to the optical line termination device 1. The optical line termination device 1 receives a frame and transmits it to a wide area network or the like.

  Note that the frame received by the optical line termination device 1 from a wide area network and the like and the frame transmitted toward the wide area network are optical signals, and the other frames are electrical signals. Here, the distinction and mutual conversion are described. I will not mention it.

  As shown in FIG. 2A, the optical line termination device 1 repeats the sleep state S and the active state A over time, and in the sleep state S, the frame processing function from the gateway device 2 is changed to the active state A. Compared to lower power.

  Further, the optical line termination device 1 is in the active state A for a certain period from the time t0 when the frame is received from the gateway device 2 regardless of the timing shown in FIG. 2A (FIG. 2B).

  Further, as shown in FIG. 2A, the gateway device 2 repeats the sleep state S and the active state A over time, and in the sleep state S, the frame processing function from the optical line termination device 1 is activated. Lower power than A.

  Further, the gateway device 2 is in the active state A for a certain period from the time t0 when the frame is received from the optical line terminating device 1 regardless of the timing shown in FIG. 2 (a) (FIG. 2 (b)).

  Hereinafter, the start time of one active state A in FIG. 2A is the active state start time ta, the time length of the active state A is Ta, the time length of the sleep state S is Ts, and the time t0 in FIG. Let Tb be the time length of the active state S immediately after. Note that ta, Ta, Ts, and Tb do not need to match in the optical line termination device 1 and the gateway device 2.

  As illustrated in FIG. 1, the optical line termination device 1 includes a buffer 11, a buffer management unit 12, a sleep setting unit 13, a state calculation unit 14, and a frame processing unit 15.

  The buffer 11 temporarily stores downstream frames. The buffer management unit 12 manages the free capacity of the buffer 11.

  The sleep setting unit 13 stores parameters for determining the timing of transition between the sleep state and the active state in the gateway device 2.

  For example, the sleep setting unit 13 includes an active state start time ta in the gateway device 2, a time length Ta in the gateway device 2 (time length in the active state A in FIG. 2A), and a time length Ts in the gateway device 2. (Time length in sleep state S in FIG. 2A) and time length Tb in gateway device 2 (time length in active state A in FIG. 2B) are stored.

  The state calculation unit 14 determines whether the gateway device 2 is in the sleep state or in the active state based on the active state start time ta, the time lengths Ta, Ts, and Tb and the transmission time when the frame is transmitted to the gateway device 2. To do.

  When it is determined that the gateway device 2 is in an active state when a frame is to be transmitted to the gateway device 2, the frame processing unit 15 transmits the frame to the gateway device 2 and is determined to be in a sleep state. Then, the frame is stored in the buffer 11 and, for example, when a predetermined time elapses, the frame is read from the buffer 11 and transmitted to the gateway device 2.

  The gateway device 2 includes a buffer 21, a buffer management unit 22, a sleep setting unit 23, a state calculation unit 24, and a frame processing unit 25.

  The buffer 21 temporarily stores upstream frames. The buffer management unit 22 manages the free capacity of the buffer 21.

  The sleep setting unit 23 stores parameters for determining the timing of transition between the sleep state and the active state in the optical line terminating device 1.

  For example, the sleep setting unit 23 includes an active state start time ta in the optical line termination device 1, a time length Ta in the optical line termination device 1 (time length in the active state A in FIG. 2A), and an optical line termination. The time length Ts in the device 1 (time length in the sleep state S in FIG. 2A) and the time length Tb in the optical line terminating device 1 (time length in the active state A in FIG. 2B) are stored.

  Based on the active state start time ta, time lengths Ta, Ts, Tb and the transmission time at which the frame is transmitted to the optical line termination device 1, the state calculation unit 24 determines whether the optical line termination device 1 is in the sleep state or in the active state. Determine if there is.

  When it is determined that the optical line termination device 1 is in an active state when the frame is to be transmitted to the optical line termination device 1, the frame processing unit 25 transmits the frame to the optical line termination device 1, while in the sleep state. If it is determined, the frame is stored in the buffer 21 and, for example, when a predetermined time elapses, the frame is read from the buffer 21 and transmitted to the optical network unit 1.

Example 1
First, Example 1 in the communication system according to the present embodiment will be described.

  FIG. 3 is a flowchart of operations performed by the optical line termination device 1 for each downlink frame in the first embodiment.

  For example, when the frame processing unit 15 receives a frame and enters a state in which the frame is to be transmitted to the gateway device 2, the frame processing unit 15 inquires of the buffer management unit 12 whether the buffer 11 is full (S1). The buffer management unit 12 answers whether the buffer 11 is full. The full state means a state where the free capacity of the buffer 11 is less than one frame.

  If the buffer 11 is full (S1: YES), the frame processing unit 15 transmits the frame to the gateway device 2 (S3) and ends the operation.

  If the buffer 11 is not full (S1: NO), the frame processing unit 15 inquires of the state calculation unit 14 whether the gateway device 2 is in the sleep state or in the active state.

  The state calculation unit 14 determines whether the gateway device 2 is in a sleep state or an active state (S5), and replies.

  Here, the determination in step S5 will be described.

  When the last frame is transmitted to the gateway device 2 in advance, the state calculation unit 14 stores the transmission time t0, in other words, the time when the gateway device 2 last received the frame from the optical line terminal device 1. Keep it.

  Then, the state calculation unit 14 reads the active state start time ta and the time lengths Ta, Ts, and Tb from the sleep setting unit 13 at the timing of step S5, and the current time t is the following formula (1) or formula (2). If the condition is satisfied, the gateway device 2 is determined to be in the active state, and if not satisfied, it is determined to be in the sleep state.

ta + n (Ta + Ts) <t <ta + n (Ta + Ts) + Ta (1)
(Where n is 0 or a positive integer)
t0 <t <t0 + Tb (2)

  If the gateway device 2 is in the active state, the frame processing unit 15 transmits a frame to the gateway device 2 (S3) and ends the operation.

  If the gateway device 2 is in the sleep state, the frame processing unit 15 stores the frame in the buffer 11 (S7) and ends the process.

  FIG. 4 is a flowchart of the operation performed for each downlink frame stored in the buffer 11 by the optical line terminating device 1 in the first embodiment.

  The frame processing unit 15 determines whether or not a predetermined time (for example, a time of about several milliseconds) has elapsed since the frame was stored in the buffer 11 (S11), and if it has elapsed, reads the frame from the buffer 11 To the gateway device 2 (S13), and the operation ends.

  As for the operation of the gateway device 2, the optical line termination device 1, the buffer 11, the buffer management unit 12, the sleep setting unit 13, the state calculation unit 14, the frame processing unit 15, the downlink frame in the above description, the gateway device 2, the buffer 21, the buffer management unit 22, the sleep setting unit 23, the state calculation unit 24, the frame processing unit 25, and the uplink frame may be read, and the description thereof is omitted.

  Therefore, according to the first embodiment, the state calculation unit determines whether the partner communication apparatus is in the sleep state or the active state based on the parameter and the transmission time of the frame to the partner communication apparatus, and the frame The processing unit transmits a frame to be transmitted to the partner communication device to the partner communication device if the partner communication device is active, and stores the frame in the buffer if the partner communication device is in the sleep state. Since the frame is read out and transmitted to the other communication device, the sleep state of the other communication device can be lengthened, and the other communication device can be saved in power.

  In addition, since it is not necessary to control (external control) the state in the partner communication device, the partner communication device can apply autonomous control, so that the communication time of the control signal can be omitted, and the effect of low delay is also achieved. can get.

(Example 2)
Next, Example 2 in the communication system according to the present embodiment will be described.

  FIG. 5 is a flowchart of the operation performed by the optical line terminating device 1 for each downlink frame in the second embodiment.

  For example, when the frame processing unit 15 receives a frame and enters a state in which the frame is to be transmitted to the gateway device 2, the frame processing unit 15 inquires of the buffer management unit 12 whether the buffer 11 is full (S1). The buffer management unit 12 answers whether the buffer 11 is full.

  If the buffer 11 is full (S1: YES), the frame processing unit 15 transmits the frame to the gateway device 2 (S3) and ends the operation.

  If the buffer 11 is not full (S1: NO), the frame processing unit 15 inquires of the state calculation unit 14 whether the gateway device 2 is in the sleep state or in the active state.

  The state calculation unit 14 determines whether the gateway device 2 is in a sleep state or an active state (S5), and replies. The determination method is the same as in the first embodiment, for example.

  If the gateway device 2 is in the active state, the frame processing unit 15 transmits a frame to the gateway device 2 (S3) and ends the operation.

  If the gateway device 2 is in the sleep state, the frame processing unit 15 causes the state calculation unit 14 to calculate the length of time until the gateway device 2 enters the active state. The state calculation unit 14 calculates the length of time until the gateway device 2 enters the active state (S51), and replies to the frame processing unit 15.

  Here, the calculation in step S51 will be described.

  The state calculation unit 14 calculates the time length T in Expression (3) as the time length until the gateway device 2 enters the active state.

T = ta + (n + 1) (Ta + Ts) -t (3)
Where ta is the start time of one active state A in the gateway device 2 (active state start time), t0 is the time when the frame was last transmitted to the gateway device 2, t is the current time, and n is 0 or a positive integer. And n satisfying the formula (4).

  ta + Ta + n (Ta + Ts) <t <ta + (n + 1) (Ta + Ts) (4)

  The frame processing unit 15 stores the time length (T) until the gateway device 2 becomes active, stores the frame in the buffer 11 (S7), and ends the process.

  FIG. 6 is a flowchart of the operation performed for each downlink frame stored in the buffer 11 by the optical network unit 1 in the second embodiment.

  The frame processing unit 15 determines whether or not the time corresponding to the time length T has elapsed since the frame was stored in the buffer 11 (S111). If the time has elapsed, the frame is read from the buffer 11 and transmitted to the gateway device 2. (S13), the operation ends.

  As for the operation of the gateway device 2, the optical line termination device 1, the buffer 11, the buffer management unit 12, the state calculation unit 14, the frame processing unit 15, the downlink frame in the above description, the gateway device 2, the buffer 21, and the buffer management unit. 22, the state calculation unit 24, the frame processing unit 25, and the uplink frame may be read, and the description is omitted.

  Therefore, according to the second embodiment, if the partner communication device is in the sleep state, the state calculation unit calculates the time length until the partner communication device becomes active based on the parameter and the transmission time, When the time corresponding to the length of time has elapsed, the frame processing unit reads the frame from the buffer and transmits it to the partner communication device, so it can be kept in the sleep state until the partner communication device becomes active. The power of the partner communication device can be saved, and the frame can be received at the timing when the communication device is in the active state, so that the delay can be shortened.

Example 3
Next, Example 3 in the communication system according to the present embodiment will be described.

  For example, the third embodiment is for a frame having a low priority among two types of frames having different priorities. The third embodiment may be applied to all frames.

  The optical line termination device 1 performs the same operation as in FIG. 3 for each downlink frame (for example, a frame with a low priority) to be transmitted to the gateway device 2. Therefore, the detailed description is abbreviate | omitted.

  On the other hand, in the optical line termination device 1, the frame processing unit 15 immediately transmits frames with high priority to the gateway device 2 without storing them in the buffer regardless of the state of the gateway device 2.

  FIG. 7 is a flowchart of the operation performed for each downlink frame stored in the buffer 11 by the optical line termination device 1 in the third embodiment.

  The frame processing unit 15 inquires of the buffer management unit 12 whether the buffer 11 is full (S112). The buffer management unit 12 answers whether the buffer 11 is full.

  If the buffer 11 is full (S112: YES), the frame processing unit 15 reads a frame (for example, a frame having a low priority) from the buffer 11, transmits it to the gateway device 2 (S13), and ends the operation.

  As for the operation of the gateway device 2, the optical line terminating device 1, the buffer 11, the buffer management unit 12, the frame processing unit 15, and the downstream frame for the gateway device 2, the buffer 21, the buffer management unit 22, and the frame processing unit in the above description. 25, since it may be read as an upstream frame, the description is omitted.

  Therefore, according to the third embodiment, when the buffer is full, the frame processing unit reads the frame from the buffer and transmits the frame to the partner communication device, so that the sleep state of the partner communication device can be made longer. Can save more power.

  Further, by applying the third embodiment to the low priority frame, it is possible to save the power of the counterpart communication device, and in particular, by transmitting the high priority frame to the counterpart communication device without storing it in the buffer. , The delay can be shortened.

  In the present embodiment, as an example of two communication devices, one is an optical line termination device 1 and the other is a gateway device 2, but the present invention is not limited to this, and the two communication devices transmit frames to each other. Anything is acceptable.

DESCRIPTION OF SYMBOLS 1 ... Optical line termination device 2 ... Gateway apparatus 11, 21 ... Buffer 12, 22 ... Buffer management part 13, 23 ... Sleep setting part 14, 24 ... State calculation part 15, 25 ... Frame processing part Ta, Tb ... Active state Time length Ts ... Sleep time length t ... Current time t0 ... Transmission time

Claims (7)

  1. A communication system including two communication devices, one transmitting a frame with the other as a partner and the other transmitting a frame with the other as a partner,
    Each of the communication devices is
    A buffer,
    A sleep setting unit in which parameters for determining the timing of transition between the sleep state and the active state in the counterpart communication device are stored;
    A state calculator that determines whether the partner communication device is in a sleep state or an active state based on the parameter and the transmission time of the frame to the partner communication device;
    While transmitting the frame to be transmitted to the counterpart communication device to the counterpart communication device if the counterpart communication device is in an active state, and storing the frame in the buffer if the counterpart communication device is in a sleep state, A frame processing unit that reads the frame from the buffer and transmits the frame to the counterpart communication device.
  2. The frame processing unit
    The communication system according to claim 1, wherein if the buffer is full, the frame is transmitted to the partner communication device without being stored in the buffer.
  3. In the sleep setting unit,
    An active state start time ta which is a start time of one active state when the counterpart communication device repeats an active state and a sleep state, a time length Ta of the active state, a time length Ts of the sleep state, A time length Tb of the predetermined period when the communication apparatus of the other party receives the frame and is active for a predetermined period is stored;
    The state calculation unit
    When the transmission time of the frame to the counterpart communication device is t0, it is determined that the counterpart communication device is in an active state if the current time t satisfies one of the following two formulas, and is in a sleep state if not satisfied: Ta + n (Ta + Ts) <t <ta + n (Ta + Ts) + Ta
    (Where n is 0 or a positive integer)
    t0 <t <t0 + Tb
    The communication system according to claim 1 or 2.
  4. The state calculation unit
    If the partner communication device is in a sleep state, based on the parameter and the transmission time, calculate the length of time until the partner communication device becomes active,
    The frame processing unit
    The communication system according to any one of claims 1 to 3, wherein when a time corresponding to the time length has elapsed, the frame is read from the buffer and transmitted to the communication apparatus of the other party.
  5. In the sleep setting unit,
    An active state start time ta which is a start time of one active state when the counterpart communication device repeats an active state and a sleep state, a time length Ta of the active state, a time length Ts of the sleep state, A time length Tb of the predetermined period when the communication apparatus of the other party receives the frame and is active for a predetermined period is stored;
    The state calculation unit
    When the transmission time is t0 and the current time is t,
    The time length T of the following equation is calculated as the time length until the partner communication device becomes active T = ta + (n + 1) (Ta + Ts) −t
    (Where n is 0 or a positive integer, and n satisfies the following formula)
    ta + Ta + n (Ta + Ts) <t <ta + (n + 1) (Ta + Ts)
    The communication system according to claim 4.
  6. The frame processing unit
    The communication system according to any one of claims 1 to 3, wherein when the buffer becomes full, the frame is read from the buffer and transmitted to the counterpart communication device.
  7. The frame processing unit
    Of the two types of frames having different priorities, a frame having a high priority is transmitted to the partner communication device without being stored in the buffer, and a frame having a low priority is transmitted if the partner communication device is in an active state. When the partner communication device is in a sleep state, the low priority frame is stored in the buffer, and when the buffer is full, the priority is transmitted from the buffer to the partner communication device. The communication system according to any one of claims 1 to 3, wherein a low frame is read and transmitted to the communication apparatus of the other party.
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JP2004165791A (en) * 2002-11-11 2004-06-10 Fujitsu Ltd Apparatus for wireless base station capable of communicating with a plurality of wireless terminals, wireless terminal making communication with wireless base station, and program and method for the same
JP2005101756A (en) * 2003-09-22 2005-04-14 Sony Corp Wireless communication system, wireless communication apparatus, wireless communications method, and computer program
JP2012104941A (en) * 2010-11-08 2012-05-31 Oki Electric Ind Co Ltd Radio communication device, program therefor, and communication system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004165791A (en) * 2002-11-11 2004-06-10 Fujitsu Ltd Apparatus for wireless base station capable of communicating with a plurality of wireless terminals, wireless terminal making communication with wireless base station, and program and method for the same
JP2005101756A (en) * 2003-09-22 2005-04-14 Sony Corp Wireless communication system, wireless communication apparatus, wireless communications method, and computer program
JP2012104941A (en) * 2010-11-08 2012-05-31 Oki Electric Ind Co Ltd Radio communication device, program therefor, and communication system

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Title
JPN6016005647; 野村  紘子 他: 'PON区間制御メッセージの転送によるONU-HGW間PHY省電力化の提案' 電子情報通信学会2012年総合大会講演論文集  通信2 , 20120306, p.304 *

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