JP2004165791A - 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 - Google Patents

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 Download PDF

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Publication number
JP2004165791A
JP2004165791A JP2002326785A JP2002326785A JP2004165791A JP 2004165791 A JP2004165791 A JP 2004165791A JP 2002326785 A JP2002326785 A JP 2002326785A JP 2002326785 A JP2002326785 A JP 2002326785A JP 2004165791 A JP2004165791 A JP 2004165791A
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Japan
Prior art keywords
data
terminal
buffer memory
transmitted
power saving
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2002326785A
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Japanese (ja)
Inventor
Terunao Ninomiya
照尚 二宮
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Fujitsu Ltd
富士通株式会社
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Priority to JP2002326785A priority Critical patent/JP2004165791A/en
Publication of JP2004165791A publication Critical patent/JP2004165791A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • Y02D70/14Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT] in Institute of Electrical and Electronics Engineers [IEEE] networks
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • Y02D70/44Radio transmission systems, i.e. using radiation field
    • Y02D70/448Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • Y02D70/449Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile

Abstract

In a wireless network system, data transfer is performed to give priority to power consumption efficiency.
An apparatus (200, 310) for a wireless base station capable of communicating with a plurality of wireless terminals (100) includes a buffer memory (226, 326), a control unit (224, 324) for the buffer memory, It comprises a transmitting means (282) and a receiving means (284). When the communication with a certain terminal among the plurality of wireless terminals is in a power saving mode, the control means responds to the reception of data to be transmitted to the certain terminal, and Data is stored in the buffer memory in the area for the terminal. When the communication with the certain terminal is in the power saving mode, when a predetermined timing or when the buffer storage amount reaches a certain value, the control means reads the buffer from the area of the buffer memory. The data to be transmitted is read continuously until there is no more data in the buffer memory, and the transmission means is made to continuously transmit the data to be transmitted.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless random access network, and more particularly, to a terminal such as a portable terminal, a device such as a base station and a server, and a program and a method for configuring a wireless LAN compliant with IEEE 802.11.
[0002]
[Prior art]
FIG. 1 shows power management in a non-power saving mode and a power saving mode in a wireless terminal receiving data from a base station (access point = AP) according to the IEEE 802.11 standard. In the non-power saving mode of IEEE 802.11, the wireless terminal is in an active state in which power can be always transmitted and received by supplying power to the transmitter and the receiver. In the IEEE 802.11 power saving mode, the wireless terminal is normally in a dormant (dose) state (mode) in which power supply to the transmitter and the receiver is suppressed as much as possible. In order to confirm the presence / absence of data to be received, the wireless terminal periodically enters a transmission / reception active state for a certain period of time and receives a packet including information indicating the presence / absence of data to be received. In the infrastructure mode in which the wireless terminal communicates via the base station, the TIM in the beacon periodically transmitted to all the terminals by the base station indicates whether there is data to be transmitted from the base station to the terminal. Contains information. In the ad hoc mode in which direct communication is performed between terminals, at the moment when all terminals are activated immediately after a beacon, the ATIM packet transmitted from the data transmission source terminal to the reception destination terminal and the transmission terminal transmits the ATIM packet to the reception terminal. Information indicating the presence or absence of data to be transmitted is included.
[0003]
In the infrastructure mode, when receiving data, the terminal transmits a data transmission request to the base station and enters a reception standby state. The base station that has received the data transmission request from the terminal transmits the buffered data to the terminal in a reception standby state. After the terminal has received all of the buffered data, it returns to the dormant state again. Transmission from a certain terminal to a base station or another terminal is performed at any time. In the ad hoc mode, the terminal that has received the ATIM packet transmits a transmission confirmation (ACK) to the terminal that has transmitted the ATIM, and requests the terminal that has transmitted the ATIM to transmit data. In the ad hoc mode, the terminal in the power saving state that has been activated once continues the activated state (mode) until the end of the next ATIM reception section. In particular, in the infrastructure mode, in the IEEE 802.11 standard power saving mode, data is transmitted and received only for each beacon, and the data transfer efficiency is poor. According to the power saving method of the IEEE802.11 standard, in the ad hoc mode, the power-on efficiency is low because the active state continues for one beacon section even during a time when no data is generated.
[0004]
FIG. 2 shows a known data receiving method in which the data transfer efficiency is improved. For example, when the terminal receives a notification that data addressed to itself is buffered by the base station in the reception of the beacon in (1), the terminal temporarily shifts to the non-power saving mode. , And sequentially receive the data buffered by the base station. After a predetermined standby period has elapsed with no received data since the last (previous) data transmission as shown in (2), the terminal performs the non-power saving mode as shown in (3). And return to hibernation. Although the transfer efficiency can be prevented from being reduced by the improved system, even when transmission / reception data is sparsely generated, the power consumption efficiency is low because the terminal continues to be in the active state for at least a certain period.
[0005]
[Problems to be solved by the invention]
The inventor of the present invention has stated that there is a need for a power-efficient data transfer method that minimizes the power consumption of a battery in mobile devices such as a mobile phone, a PDA, and a notebook personal computer that constitute a wireless network. Recognized.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to realize a wireless network system that performs data transfer that prioritizes power consumption efficiency when power consumption needs to be reduced. Another object of the present invention is to provide a wireless network system capable of storing input data and continuously transmitting or receiving the stored data in a short time when it is necessary to reduce power consumption. It is to be.
[0007]
[Means for Solving the Problems]
According to one aspect of the present invention, an apparatus for a wireless base station capable of communicating with a plurality of wireless terminals includes a buffer memory, control means for the buffer memory, transmitting means, and receiving means. . The control means includes a power saving mode in which communication with a certain terminal among the plurality of wireless terminals includes a sleep state in which neither transmission nor reception is performed, and an activation state in which data can be transmitted or received. Storing the data to be transmitted in an area for the terminal in the buffer memory in response to receiving the data to be transmitted to the terminal, especially in the above-described improved power saving mode. Let it. When the communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the control means reads the area from the buffer memory into the buffer memory. Until there is no more data, the data to be transmitted is continuously read, and the transmission means is made to continuously transmit the data to be transmitted.
[0008]
According to another feature of the present invention, a wireless terminal communicating with a wireless base station comprises transmitting means and receiving means. The transmitting means and the receiving means have a power saving mode composed of a sleep state in which neither transmission nor reception is performed, and an activation state in which data can be transmitted or received. The control of the control means stores the data to be transmitted in the buffer memory in response to receiving the data to be transmitted. The transmission means shifts to an activated state when a predetermined timing or a predetermined buffer storage amount is reached, and reads out the data to be transmitted from the buffer memory until there is no more data in the buffer memory, and continuously reads the data. Transmit, and if neither transmission nor reception occurs during a predetermined time, the mobile terminal shifts to the sleep state. The predetermined timing interval is longer than the predetermined time.
[0009]
According to yet another aspect of the invention, a program for a device capable of communicating with a plurality of wireless terminals is provided, wherein the communication with a terminal among the plurality of wireless terminals is a pause in which neither transmission nor reception is performed. In a power saving mode composed of a state and an active state capable of transmitting or receiving data, in response to receiving data to be transmitted to the certain terminal, the data to be transmitted is stored in the buffer memory. Storing the data in the area for the certain terminal; and, when communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the buffer memory is used. Continuously reading the data to be transmitted and continuously transmitting the data to be transmitted until there is no more data in the buffer memory from the area of the buffer memory. Possible it is.
[0010]
According to yet another aspect of the invention, in response to receiving the data to be transmitted, storing the data to be transmitted in a buffer memory, and when a predetermined timing or a predetermined buffer storage amount is reached. Then, the system shifts to an activation state in which data transmission is possible, reads out the data to be transmitted from the buffer memory until there is no more data in the buffer memory, continuously transmits the data, and performs transmission and reception during a predetermined time. If none of the above occur, the step of shifting to a sleep state in which neither transmission nor reception is performed is operable. The predetermined timing interval is longer than the predetermined time.
[0011]
According to still another feature of the present invention, a communication method in a device capable of communicating with a plurality of wireless terminals, when communication with a terminal among the plurality of wireless terminals is in a power saving mode, Storing the data to be transmitted in an area for the terminal in the buffer memory in response to receiving the data to be transmitted to the terminal; and eliminating communication with the terminal. In the power mode, when a predetermined timing or a predetermined buffer storage amount is reached, the data to be transmitted is continuously read from the area of the buffer memory until there is no more data in the buffer memory. Transmitting the data to be transmitted continuously.
[0012]
According to the present invention, when it is necessary to reduce power consumption, it is possible to realize a wireless network system that performs data transfer such that power consumption efficiency is prioritized, and when it is necessary to reduce power consumption, A wireless network system that can store input data and continuously transmit or receive the stored data in a short time can be realized. Further, according to the present invention, it is possible to implement the above functions at low cost and easily, for example, by changing only a control program in an existing system.
[0013]
In the drawings, the same elements have the same reference numerals.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 3 illustrates the principle of the present invention. A wireless terminal and a wireless base station (AP) constituting a wireless network are in a mutually synchronized state by the base station transmitting a beacon to each wireless terminal in advance. Therefore, each wireless terminal knows the timing of transmitting a beacon from the base station. Each wireless terminal randomly accesses a wireless line to transmit and receive data.
[0015]
The upper part of FIG. 3 shows the operation of the known data receiving method shown in FIG. As described above, even when transmission / reception data is sparsely generated, the power consumption efficiency is poor because the terminal continues to be in the active state for at least a certain period.
[0016]
On the other hand, when a certain wireless terminal is operating in the power saving mode according to the present invention, a wireless base station or a server or another wireless terminal constituting a wireless network transmits a transmission data packet addressed to the certain wireless terminal. Is stored in a buffer memory, and when the certain wireless terminal starts periodically or at a predetermined timing, and shifts to the starting state, the transmission data packet stored in the buffer memory is continuously read out and the certain wireless terminal is read out. Continuously to the wireless terminal. Also, when the wireless terminal is operating in the power saving mode according to the present invention, the wireless terminal accumulates transmission data packets in a buffer memory and shifts to an active state periodically or at a predetermined timing, and Alternatively, continuously transmit data packets to another terminal. After transmitting and receiving the data packet, the wireless terminal returns from the active state to the dormant state after a predetermined standby period has elapsed with no transmission or reception after transmission or reception of the last (previous) data packet. Therefore, the power consumption of the wireless terminal is minimized in the sleep state, the ratio of data transmission / reception time in the active state is large, and the efficiency of power consumption for data transfer is high.
[0017]
The power saving mode according to the present invention can be used as the second or third power saving mode in combination with the conventional power saving mode illustrated in FIG. 1 (lower side) and / or FIG.
[0018]
FIG. 4 is a diagram illustrating a wireless LAN according to an embodiment of the present invention. M 1 shows the configuration of a plurality of terminals 100 to 106, a wireless base station (AP) 200, and an application server 300 that communicates with the wireless base station 200 via a wired LAN 50. The base station 200 can perform buffer control of transmission data addressed to the n terminals 100 to 106.
[0019]
Referring to FIG. 4, the terminal 100 includes a processor 102, a transmission unit (TX) 182, and a reception unit (RX) 184. On the processor 102, communication between the terminal 100 and the base station 200 is performed in accordance with the applications 132a and 134a that receive the received data and a user request generated by a user's setting operation of the terminal 100 and / or the remaining power of the battery in the terminal 100. An application 136 that sets the power saving mode and supplies information indicating the setting state (command) related to the power saving mode, the user request, and / or the remaining battery power to the base station 200 is implemented. The transmission unit 182 and the reception unit 184 include a transmission processing unit that performs transmission buffer control, and a wireless transmitter. Receiving section 184 includes a wireless receiver.
[0020]
When the setting state related to the power saving mode, the user request, or the remaining battery power in the terminal 100 changes, the application 136 sends the current setting state (command), the user request and / or the power to the base station 200 in a packet to be transmitted. Notify information indicating the remaining amount. The application 136 sets communication between the terminal 100 and the base station 200 to the power saving mode according to a user request for the power saving mode. Further, the application 136 may set the communication between the terminal 100 and the base station 200 to the power saving mode only when the remaining power of the battery becomes lower than a certain threshold value according to a user request regarding the power saving mode. Good. Also, the application 136 sets communication between the terminal 100 and the base station 200 to the power saving mode when the remaining power of the battery becomes lower than a certain threshold, regardless of a user request for the power saving mode. You may.
[0021]
The application server 300 includes a processor 302. On the processor 302, applications 332a and 334a that supply transmission data to the base station 200 are implemented. Application 332a generates data that needs to be transmitted with low delay, for example, for telephone or VoIP. On the other hand, the application 334a generates data to be buffered and transmitted, for example, data for file transfer or streaming broadcast. The application 332a corresponds to the application 132a and supplies data for the application 132a. The application 334a corresponds to the application 134a and supplies data for the application 134a.
[0022]
The base station 200 includes a power saving determination mechanism 220, a traffic control unit 222 including a buffer memory control unit 224 and a buffer memory 226, and a transmission unit (TX) 282 and a reception unit (RX) for communicating with the terminals 100 to 106. 284.
[0023]
The power saving determining mechanism 220 receives, from the terminal 100, information indicating a setting state (command) related to the power saving mode, a user request related to the power saving mode, and / or remaining battery power, and communicates with the terminal 100 according to the information. It is determined whether communication should be traffic controlled in the power saving mode, and the result of the determination, that is, the control mode of the buffer memory area addressed to the terminal 100 in the buffer memory 336 is notified to the traffic control unit 222. The power saving determination mechanism 220 determines that the control mode of the area of the buffer memory 226 destined for the terminal 100 should be traffic controlled in the power saving mode in accordance with the setting state (command) related to the power saving mode. In addition, the power saving determining mechanism 220 determines that the traffic control should be performed in the power saving mode for the control mode of the area addressed to the terminal 100 in the buffer memory 226 according to the user's request. Further, according to a predetermined rule regarding the power saving mode, when the remaining power of the battery of the terminal 100 is smaller than a certain threshold, the power saving determining mechanism 220 changes the control mode of the buffer memory area of the buffer memory 336 addressed to the terminal 100. It is determined that traffic control should be performed in the power saving mode.
[0024]
The buffer memory control unit 222 determines n according to the determination result of the power saving determination unit 220, that is, the control mode of communication with the terminals 100 to 106. M The buffering of transmission data addressed to each of the terminals 100 to 106 is controlled.
[0025]
FIG. 7 shows a processing flow for buffer control executed by the buffer control unit 224 in the base station 200 according to the time chart of FIG. The n-th terminal is represented as terminal n. Here, the initial value of n is set to 1.
[0026]
In step 702, the buffer control unit 224 determines whether or not there is an input data packet supplied from the application 332a or 334a to the base station 200 via the LAN 50. If it is determined that there is no input data packet, the procedure proceeds to step 716.
[0027]
When it is determined in step 702 that there is an input data packet, in step 704, the buffer control unit 224 determines the input data packet in accordance with the determination result regarding the power saving mode of the buffer memory area addressed to each terminal from the power saving determining apparatus 200. It is determined whether the input data packet is destined for a terminal in a power saving mode requiring traffic control. If it is determined that the input data packet is not addressed to a terminal in the power saving mode requiring traffic control, the procedure proceeds to step 708. If it is determined that the input data packet is destined for the terminal in the power saving mode requiring traffic control, the buffer control unit 224 determines in step 706 whether the input data packet is a low delay data packet, It is determined whether the data packet is to be transmitted immediately from the application 332a or to be buffered and transmitted from the application 334a. If the input data packet is determined to be a low-latency data packet, the procedure proceeds to step 708.
[0028]
In step 708, the buffer control unit 224 passes the input data packet to the transmission unit 282. Thereafter, the procedure returns to step 702. Transmitting section 282 stores the input data packet in a transmission buffer addressed to terminal n. When the terminal n is in the power saving mode, the terminal notifies the terminal via a next beacon that there is a data packet to be received, and responds to polling from the terminal or after receiving the packet, the data packet. To the terminal n. If the terminal n is not in the power saving mode, the transmitting unit 282 transmits the data packet to the terminal n as soon as the wireless line becomes available.
[0029]
If it is determined in step 706 that the input data packet is not a low-latency data packet, that is, a data packet to be buffered and transmitted, the buffer control unit 224 determines in step 710 that the The input data packet is stored in the corresponding terminal-specific (n) area, and the amount of the input data packet is added to the indicator indicating the current data packet amount of the corresponding terminal in the buffer memory 226 in step 712. I do.
[0030]
In step 714, the buffer control unit 224 determines whether the indicator of the data packet amount in the buffer memory area for the terminal n in the buffer memory 224 has exceeded a predetermined threshold. If it is determined that the indicator has exceeded a predetermined threshold, the procedure proceeds to step 718. If it is determined that the indicator does not exceed the predetermined threshold, in step 716, the buffer control unit 224 monitors the current time of the timer to determine whether the current time is equal to the terminal n in the buffer memory 226. It is determined whether or not the transmission time indicating the timing at which the data packet should be transmitted has elapsed. If it is determined that the transmission time has elapsed, the procedure proceeds to step 718.
[0031]
In step 718, the buffer control unit 222 passes the data packet in the buffer memory area for the terminal n in the buffer memory 226 to the transmission unit 282, and transmits the data packet for the terminal n only when the determination result in step 716 is YES. Clear the timer. Thereafter, the procedure returns to step 702. Transmitting section 282 stores the input data packet in the transmission buffer of terminal n. When the terminal n is in the power saving mode, the terminal notifies the terminal via a next beacon that there is a data packet to be received, and responds to polling from the terminal or after receiving the packet, the data packet. To the terminal n. If the terminal n is not in the power saving mode, the transmitting unit 282 transmits the data packet to the terminal n as soon as the wireless line becomes available.
[0032]
If it is determined in step 716 that the transmission time has not elapsed, in step 720, n is the sum of the number of terminals and 1 (n M +1) is determined. n is n M If it is determined that it is smaller than +1, n = n + 1 is set, and the procedure returns to step 716. n is n M If it is determined that it is not smaller than +1, n = 1 is set, and the procedure returns to step 702.
[0033]
FIG. 5 is a block diagram illustrating a wireless LAN according to another embodiment of the present invention. M 1 shows a configuration of each of the terminals 100 to 106, a wireless base station (AP) 210, and an application server 310 that communicates with the wireless base station 210 via the wired LAN 50. The application server 310 can perform buffer control of a transmission data packet addressed to the terminal in the power saving mode among the n terminals 100 to 106.
[0034]
Referring to FIG. 5, the application server 310 includes a power saving determining mechanism 320, a traffic control unit 322 including a buffer memory control unit 324 and a buffer memory 326, and a transmission / reception unit (not shown) for communicating with the base station 210. ) And a processor 302. On the processor 302, applications 332a and 334a that supply transmission data packets are implemented. Application 332a generates data packets that need to be transmitted with low delay. Application 334a generates data packets that are buffered and transmitted.
[0035]
The power saving determining mechanism 320 transmits information indicating the state (command) of the setting related to the power saving mode of the terminal 100, a user request regarding the power saving mode, and / or the remaining battery power from the terminal 100 via the base station 210. Based on the received information, it is determined whether or not to perform traffic control on the terminal 100 in the power saving mode according to the information. Notice. The power saving determination mechanism 320 determines that the control mode of the area in the buffer memory 326 destined for the terminal 100 should be traffic controlled in the power saving mode according to the setting state (command) related to the power saving mode. The power saving determination mechanism 320 determines that the traffic control should be performed in the power saving mode for the control mode of the area addressed to the terminal 100 in the buffer memory 326 according to the user's request. When the remaining power of the battery of the terminal 100 is smaller than a certain threshold, the power saving determining mechanism 320 changes the control mode of the area addressed to the terminal 100 in the buffer memory 326 to the power saving mode according to a predetermined rule regarding the power saving mode. It is determined that traffic control should be performed in the mode.
[0036]
The buffer memory control unit 324 sets n according to the determination result of the power saving determination unit 320, that is, the control mode of communication with the terminals 100 to 106. M Control the buffering of transmission data packets addressed to each of the terminals 100-106.
[0037]
Upon receiving the data packet from server 310, base station 210 transmits the received packet to terminal 100 (106), which is the destination, at the next transmission timing.
[0038]
Terminal 100 has a configuration similar to that of FIG. 4 and will not be described again.
[0039]
The buffer memory control unit 324 operates in the same manner as the buffer memory control unit 224 of the base station in FIG. 4 according to the processing flow in FIG. 7, and will not be described again. The base station 210 stores the data packet supplied from the application server 310 in the transmission buffer memory, and transmits it to the terminal n at the next transmission timing addressed to the terminal n.
[0040]
FIG. 8 shows a processing flow for transmission buffer control executed by the transmission unit 282 in the base stations 200 and 210 of FIGS. 4 and 5 according to the time chart of FIG.
[0041]
The transmission unit 282 of the base stations 200 and 210 waits for an input data packet from the traffic control unit 222 or the server 300 in step 802. Upon receiving the input data packet to be transmitted to the terminal from the traffic control unit 222 or the server 300, the transmitting unit 282 determines in step 804 whether the input data packet is addressed to the terminal in the power saving mode according to the current state of the terminal. Is determined. If it is determined that the input data packet is destined for a terminal that is in the power saving mode and not in the temporary non-power saving mode, the transmitting unit 282 transmits the input data packet to the power saving mode destined for the terminal n in step 806. (PS) When the terminal n is in the activated state, the terminal notifies the terminal that there is a data packet to be received via the beacon and responds to polling from the terminal. Or after receiving the packet, the data packet is transmitted to the terminal. If it is determined that the input data packet is not addressed to the terminal in the power saving mode or is addressed to the terminal in the temporary non-power saving mode, the transmitting unit 282 transmits the input data packet to the terminal n in step 808. And transmits the data packet to the terminal the next time the wireless line becomes available.
[0042]
FIG. 9 shows a processing flow for managing a buffer memory and transmitting / receiving a data packet to a terminal in the power saving mode, which is executed by the receiving unit 284 of the base station 200 in FIG. 4 according to IEEE 802.11.
[0043]
In step 902, receiving section 284 of base station 200 waits for reception of a packet from terminals 100 to 106. If there is a received packet, in step 904, the receiving unit 284 determines whether the received packet is from a terminal in the power saving mode. If it is determined that the received packet is not from a terminal in the power saving mode including a terminal in the temporary non-power saving mode, in step 912, the power saving determining mechanism 220 It is determined whether the power saving mode flag is ON. If it is determined that the power saving mode flag is ON, in step 914, the power saving setting of the terminal n in the terminal management tables of the transmitting unit 282 and the receiving unit 284 is set to the power saving mode. Thereafter, the procedure proceeds to step 918. If it is determined in step 912 that the power saving mode flag is not on, the procedure proceeds to step 918. In step 918, the receiving unit 284 processes the received packet. Thereafter, the procedure returns to step 902.
[0044]
If it is determined in step 904 that the received packet is from a power saving terminal excluding the terminal in the temporary non-power saving mode, in step 922, the power saving determining mechanism 220 It is determined whether the middle power saving mode flag is off. If it is determined that the power saving mode flag is off, in step 924, the power saving mode of the power saving setting of the terminal n in the terminal management tables of the transmitting unit 282 and the receiving unit 284 is released. In step 926, the receiving unit 284 determines whether the received packet includes a signal indicating polling from the terminal. If it is determined that the signal does not include a signal indicating polling, in step 928, the receiving unit 284 performs a receiving process on the received packet. Thereafter, the procedure proceeds to step 930. If it is determined in step 926 that the signal does not include a signal indicating polling, the procedure proceeds to step 930. In step 930, the transmission unit 282 supplies all data packets from the buffer memory area addressed to the terminal n in the power saving transmission buffer memory to the transmission buffer, and transmits the packets to the terminal. Thereafter, the procedure returns to step 902.
[0045]
If it is determined in step 922 that the power saving mode flag is not off, the receiving unit 284 determines in step 936 whether the received packet includes a signal indicating polling from the terminal. When it is determined that the signal does not include the signal indicating the polling, in step 938, the receiving unit 284 performs a receiving process on the received packet. Thereafter, the procedure returns to step 902. If it is determined in step 936 that the packet includes a signal indicating polling, in step 940, the transmission unit 282 transmits one packet from the buffer memory area addressed to the terminal n in the power saving buffer memory to the transmission buffer of the transmission unit 282. And sends the packet to the terminal. Thereafter, the procedure returns to step 902.
[0046]
The receiving unit 284 of the base station 210 in FIG. 5 also performs processing for managing the buffer memory for the terminal in the power saving mode and transmitting and receiving data packets according to FIG. 9 in the same manner as the base station 200 in FIG.
[0047]
FIG. 6 is a block diagram illustrating a wireless LAN according to still another embodiment of the present invention. M 1 shows the configurations of the terminals 110 to 116, the wireless base station 210, and the application server 300 that communicates with the wireless base station 210 via the wired LAN 50.
[0048]
Referring to FIG. 6, terminal 110 includes processor 102, power saving determining mechanism 120, traffic control unit 122 including buffer memory control unit 124 and buffer memory 126, transmission unit (TX) 182 and reception unit (RX). 184. On the processor 102, applications 132b and 134b for supplying a transmission data packet, and applications for providing a setting state (command) for the power saving mode, a user request for the power saving mode, and / or information indicating the remaining power of the battery. 136 are implemented. Application 132b generates data packets that need to be transmitted with low delay. Application 134b generates data packets that are buffered and transmitted. The transmission unit 182 includes a transmission processing unit that performs transmission buffer control, and a wireless transmitter. The receiving unit 184 includes a reception processing unit that performs transmission / reception buffer control, and a wireless receiver.
[0049]
The power saving determining mechanism 120 receives, from the application 136, information indicating a setting state (command) of the terminal 110 regarding the power saving mode, a user request regarding the power saving mode, and / or information indicating the remaining power of the battery. It is determined whether or not to perform traffic control in the power saving mode for the terminal 100 according to the above. The power saving determining mechanism 120 determines that the control mode of the buffer memory 126 should be traffic controlled in the power saving mode according to the setting state regarding the power saving mode. Further, the power saving determining mechanism 120 determines that the control mode of the buffer memory 126 should be traffic controlled in the power saving mode in accordance with a user request. In addition, according to a predetermined rule regarding the power saving mode, when the remaining power of the battery of the terminal 100 is smaller than a certain threshold, the power saving determining mechanism 120 should perform traffic control on the control mode of the buffer memory 126 in the power saving mode. It is determined that there is.
[0050]
The buffer memory control unit 122 buffers the transmission data packet addressed to the base station 210 or another terminal (to 116) according to the determination result of the power saving determination unit 120, that is, the control mode of communication with the terminal 100. Control.
[0051]
The base station 210 includes a transmitting unit (TX) 282 and a receiving unit (RX) 284 for communicating with the terminals 110 to 116. When receiving a data packet from terminal 110-116, base station 210 transmits the received packet to application server 310 as its destination via LAN 50.
[0052]
The application server 300 includes a processor 302. On the processor 302, applications 332b and 334b that receive the received data packet are implemented. Application 332b corresponds to application 132b and receives data packets generated by application 132b. Application 334b corresponds to application 134b and receives buffered data packets generated by application 134b.
[0053]
FIG. 10 shows a processing flow for buffer control executed by the buffer control unit 122 in the terminals 110 to 116 of FIG. 6 according to the time chart of FIG.
[0054]
In step 1004, the buffer control unit 124 determines whether there is an input data packet supplied from the application 132b or 134b or the like. If it is determined that there is no input data packet, the procedure proceeds to step 1014.
[0055]
If it is determined in step 1004 that there is an input data packet, step 1006 determines whether the input data packet is a low-latency data packet, ie, a data packet to be transmitted immediately from the application 132b or an application 134b. From the data packet to be buffered and transmitted. If it is determined that the input data packet is a low-latency data packet, in step 1008, the buffer control unit 124 immediately passes the input data packet to the transmission unit 182. Transmitting section 182 transmits the data packet to base station 210 at the next timing. Thereafter, the procedure returns to step 1002.
[0056]
If it is determined that the input data packet is not a low-latency data packet, that is, a data packet to be buffered and transmitted, in step 1010, the buffer control unit 124 stores the input data packet in the buffer memory 126. The data packets are accumulated, and the amount of input data packets of the data packet amount indicator in the buffer memory 126 is added. In step 1012, the buffer control unit 124 determines whether or not the data packet amount indicator in the buffer memory 126 for the terminal 110 has exceeded a predetermined threshold. If it is determined that the indicator has exceeded a predetermined threshold, the procedure proceeds to step 1016.
[0057]
If it is determined in step 1012 that the data packet amount indicator does not exceed the predetermined threshold, the buffer control unit 124 monitors the current time of the timer in step 1014 and It is determined whether the transmission time for transmitting the data packet in the memory 124 has elapsed. If it is determined that the transmission time has elapsed, the procedure proceeds to step 1016. In step 1016, the buffer control unit 122 passes the data packet in the buffer memory 126 to the transmission unit 182, and clears the timer if the current time has exceeded the transmission time. Transmitting section 182 transmits the data packet to base station 210 at the next timing. Thereafter, the procedure returns to step 1004. If it is determined in step 1014 that the transmission time for transmitting the data packet in the buffer memory 124 has not elapsed, the procedure returns to step 1004.
[0058]
Upon receiving the data packet from terminal 110, base station 210 transfers the received packet to server 300, which is its destination, via LAN 50.
[0059]
4 and 6 can be used in combination, terminal 100 in FIG. 4 includes the functions of terminal 110 in FIG. 6, and base station 210 in FIG. 6 may include the functions of base station 200 in FIG. . 5 and 6 can be used in combination. The terminal 100 in FIG. 5 includes the function of FIG. 6, and the application server 300 in FIG. 6 includes the function of the application server 310 in FIG. Good.
[0060]
FIG. 11 shows the case where data packets are stored in the buffer memory 226 or 326 of the base station 200 of FIG. 4 or the base station 210 of FIG. 5 for a period of four consecutive beacons, or the amount of stored packets reaches six. Then, a time chart is shown in the case where the stored data packet is supplied to the transmission buffer of the transmission unit 182 and transmitted to three terminals 100 to 106 (here, A, B and C). I have. The traffic control unit 222 or 322 of the base station 200 or the server 300 transmits data packets stored in the buffer memory area addressed to a certain terminal every four beacons from the previous power saving buffer memory area addressed to a certain terminal. When the amount of data reaches 6 packets, the data packet is transferred to the transmission buffer memory of the transmission unit 282 of the base station 200 or 300. It is assumed that the standby time of each terminal is set to one beacon period.
[0061]
Referring to FIG. 11, input data addressed to terminals A, B and C is generated and stored in buffer memory areas addressed to terminals A, B and C in buffer memory 226 or 326 for power saving terminals. The stored data packets are read out in the next beacon period after the four beacon periods and stored in the transmission buffer memory of the transmission unit 182. The transmitting unit 182 notifies the terminal A of the presence of the data packet addressed to the terminal A by using the TIM in the next beacon. Terminal A transitions to the active state immediately before receiving the beacon, receives the beacon, and transmits polling (not shown). Then, a data packet addressed to terminal A from base station 200 or 210 is transmitted to terminal A. Terminal A receives it. The terminal A maintains the waiting state for one beacon period after receiving the last packet, and shifts to the sleep state when no packet is received during that period. The base station 200 or 210 and the terminals B and C execute the same operation by shifting one beacon period at a time. In this way, each of the terminals A, B, and C continuously receives the packets buffered on the base station side, and waits for one beacon period, and then transitions to the sleep state. Therefore, the power consumption of the terminal can be reduced.
[0062]
FIG. 12 is a time chart when the traffic to the terminal A in the base station 200 or the application server 300 in FIG. 11 is large.
[0063]
Since the traffic to the terminal A is large, the buffer memory area addressed to the terminal A in the power saving buffer memory 226 or 326 transmits the six data packets every time six data packets are generated. To the transmission buffer memory. The transmission unit 182 continuously transmits the data from the transmission buffer memory to each terminal in the order of accumulation in the buffer. If the transmission destination terminal is not in the active state, the packet is temporarily saved in the power saving buffer addressed to the terminal, and the packet addressed to the activated terminal is transmitted with priority. In FIG. 12, terminal A receives the next data packet before the elapse of the waiting time, and as a result, keeps the active state for six beacon periods. As described above, the terminal A receives the data packet while maintaining the active state as long as the terminal A receives the data packet before the elapse of the standby time. The terminals B and C have a long idle period and low power consumption.
[0064]
FIG. 13 shows the activation states of the terminals A, B and C according to the prior art for comparison with FIG. 11 according to the invention. Terminals A, B, and C remain active for a relatively long time. Data packets are not transmitted continuously for each of terminals A, B and C.
[0065]
FIG. 14 shows the activation state of terminals A, B and C according to another prior art for comparison with FIG. 11 according to the invention. Terminals A, B, and C are set to wake up every four beacon periods, but still stay awake for a relatively long time. Data packets are not transmitted continuously for each of terminals A, B and C.
[0066]
FIG. 15 shows the activation states of the terminals A, B and C according to the prior art for comparison with FIG. 12 according to the present invention. Terminals A, B, and C remain active for a relatively long time. In particular, the terminal A maintains the active state for a long time. Data packets are not transmitted continuously for each of terminals A, B and C.
[0067]
The embodiments described above are given only as typical examples, modifications and variations thereof will be apparent to those skilled in the art, and those skilled in the art may depart from the principle of the present invention and the scope of the invention described in the claims. Obviously, various modifications of the above-described embodiment can be made.
[0068]
(Supplementary Note 1) An apparatus for a wireless base station capable of communicating with a plurality of wireless terminals,
A buffer memory, a control unit for the buffer memory, a transmission unit, and a reception unit,
The control unit is a power saving mode configured to include a sleep state in which communication with a certain terminal among the plurality of wireless terminals does not transmit or receive, and an active state in which data can be transmitted or received. When, in response to receiving the data to be transmitted to the certain terminal, the data to be transmitted is accumulated in the area for the certain terminal in the buffer memory,
When the communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the control unit may change the area of the buffer memory into the buffer memory. An apparatus for continuously reading the data to be transmitted until there is no more data, and causing the transmitting means to continuously transmit the data to be transmitted.
(Supplementary Note 2) When the amount of the data to be transmitted accumulated in the area of the buffer memory exceeds a predetermined threshold, the control unit further stores the data to be transmitted from the area of the buffer memory. 2. The apparatus according to claim 1, wherein the data is continuously read and transmitted by the transmitting unit.
(Supplementary note 3) The apparatus according to supplementary note 1 or 2, wherein the cycle of the predetermined timing is an integer multiple of two or more of a transmission interval of information indicating presence / absence of data transmitted to the plurality of terminals.
(Supplementary Note 4) The control unit sets the power saving mode for communication with the certain terminal according to information received from the certain wireless terminal such as a user request and / or a remaining battery level. The apparatus according to any one of supplementary notes 1 to 3, characterized in that:
(Supplementary Note 5) When the data to be transmitted is data of a type that can be delayedly transmitted, the control unit stores the data to be transmitted in the area of the buffer memory, and stores the data to be transmitted in the buffer memory. The data according to any one of claims 1 to 4, wherein when the data is of a type to be transmitted with low delay, the data to be transmitted is transmitted to the transmission means without being stored in the buffer memory. apparatus.
(Supplementary Note 6) An apparatus that communicates with a plurality of wireless terminals,
A buffer memory, a control unit for the buffer memory, a transmission unit, and a reception unit,
The control means, when communication with a certain terminal among the plurality of wireless terminals is in a power saving mode, in response to reception of data to be sent to the certain terminal, Storing data in the area for the certain terminal in the buffer memory;
The control means, when the communication with the certain terminal is in the power saving mode, when the amount of data to be transmitted accumulated in the area of the buffer memory exceeds a predetermined threshold, An apparatus for continuously reading the data to be transmitted from the area of the buffer memory until there is no more data in the buffer memory, and causing the transmission means to transmit the data to be transmitted.
(Supplementary Note 7) A wireless terminal communicating with a wireless base station,
A buffer memory, a control unit for the buffer memory, a transmission unit, and a reception unit,
The transmission unit and the reception unit have a power saving mode configured of a sleep state in which neither transmission nor reception is performed and an activation state in which data transmission or reception can be performed,
The control of the control means, in response to receiving the data to be transmitted, stores the data to be transmitted in the buffer memory,
The transmission means shifts to an activated state when a predetermined timing or a predetermined buffer accumulation amount is reached, and reads out the data to be transmitted from the buffer memory until there is no more data in the buffer memory, and continuously reads the data. Transmit, when neither transmission nor reception occurs during a predetermined time, shift to the sleep state,
The wireless terminal according to claim 1, wherein the predetermined timing interval is longer than the predetermined time.
(Supplementary Note 8) The control unit may further include, when the amount of the data to be transmitted accumulated in the area of the buffer memory exceeds a predetermined threshold, the data to be transmitted from the area of the buffer memory. 8. The wireless terminal according to claim 7, wherein the wireless terminal is continuously read and transmitted by the transmitting unit.
(Supplementary Note 9) A program for a device capable of communicating with a plurality of wireless terminals,
When the communication between a certain terminal among the plurality of wireless terminals is in a power saving mode including a sleep state in which neither transmission nor reception is performed and an activation state in which data transmission or reception is possible, In response to receiving the data to be transmitted to the certain terminal, storing the data to be transmitted in an area for the certain terminal in a buffer memory;
When the communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the data in the buffer memory is depleted from the area of the buffer memory. Continuously reading the data to be transmitted and continuously transmitting the data to be transmitted,
A program operable to execute
(Supplementary Note 10) A program for a device that communicates with a plurality of wireless terminals,
When communication with a terminal among the plurality of wireless terminals is in a power saving mode, the data to be transmitted is stored in a buffer memory in response to reception of data to be transmitted to the terminal. Storing in an area for the certain terminal;
When the communication with the certain terminal is in the power saving mode, when the amount of the data to be transmitted accumulated in the area of the buffer memory exceeds a predetermined threshold, the buffer memory Transmitting the data to be transmitted by continuously reading the data to be transmitted from the area,
A program operable to execute
(Supplementary Note 11) storing the data to be transmitted in a buffer memory in response to receiving the data to be transmitted;
When a predetermined timing or a predetermined buffer accumulation amount is reached, the state shifts to an activation state in which data transmission is possible, and the data to be transmitted is read out continuously from the buffer memory until data in the buffer memory is exhausted. Transmitting, when neither transmission nor reception occurs during a predetermined time, a step of shifting to a sleep state in which neither transmission nor reception is performed;
A program for a wireless terminal communicating with a wireless base station, operable to execute
The program is characterized in that the predetermined timing interval is longer than the predetermined time.
(Supplementary Note 12) A communication method in a device capable of communicating with a plurality of wireless terminals,
When communication with a terminal among the plurality of wireless terminals is in a power saving mode, the data to be transmitted is stored in a buffer memory in response to reception of data to be transmitted to the terminal. Accumulating in the area for the certain terminal;
When the communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the data in the buffer memory is depleted from the area of the buffer memory. Continuously reading the data to be transmitted and continuously transmitting the data to be transmitted,
Communication method including.
[0069]
【The invention's effect】
According to the present invention, it is possible to realize a wireless network system that performs data transfer with priority on power consumption efficiency when power consumption needs to be reduced due to the above-described features, and it is necessary to reduce power consumption. Sometimes, a wireless network system capable of accumulating input data and continuously transmitting or receiving the accumulated data in a short period of time can be used, for example, in a control program without significantly changing an existing system. An effect is achieved that can be realized only by modification.
[Brief description of the drawings]
FIG. 1 shows power management in a non-power-saving mode and a power-saving mode in a wireless terminal receiving data from a base station according to the IEEE 802.11 standard.
FIG. 2 shows a known data receiving method in which the data transfer efficiency is improved.
FIG. 3 shows the principle of the present invention.
FIG. 4 illustrates a configuration of a terminal and a wireless base station configuring a wireless LAN, and an application server that communicates with the wireless base station via a wired LAN, according to an embodiment of the present invention.
FIG. 5 illustrates a configuration of a terminal and a wireless base station configuring a wireless LAN, and an application server that communicates with the wireless base station via a wired LAN, according to another embodiment of the present invention.
FIG. 6 illustrates a configuration of a terminal and a wireless base station configuring a wireless LAN, and an application server that communicates with the wireless base station via a wired LAN, according to still another embodiment of the present invention. .
FIG. 7 shows a processing flow for buffer control executed by the buffer control unit in the base station according to the time chart of FIG. 3;
FIG. 8 shows a processing flow for transmission buffer control executed by the transmission unit in the base station of FIG. 5 according to the time chart of FIG. 3;
FIG. 9 shows a processing flow for managing a buffer memory and transmitting / receiving a data packet to a terminal in a power saving mode, which is executed by the transmitting / receiving unit of the base station of FIG. 4 according to IEEE 802.11. I have.
FIG. 10 shows a processing flow for buffer control executed by the buffer control unit in the terminal according to the time chart of FIG. 3;
FIG. 11 is a diagram illustrating a case where data packets are accumulated in the buffer memory of the base station of FIG. 4 or the base station of FIG. 5 for a period of four consecutive beacons, or the amount of accumulated packets reaches six. A time chart is shown in a case where the stored data packet is supplied to a transmission buffer of a transmission unit and transmitted to three terminals.
FIG. 12 is a time chart in the case where traffic to the terminal A in the base station or the application server in FIG. 11 is large.
FIG. 13 shows an activation state of a terminal according to the prior art for comparison with FIG. 11 according to the present invention.
FIG. 14 shows another prior art terminal activation state for comparison with FIG. 11 according to the present invention.
FIG. 15 shows an activation state of a terminal according to the prior art for comparison with FIG. 12 according to the present invention.
[Explanation of symbols]
50 Wired LAN
100-106 wireless terminal
200 wireless base station
220 Power saving judgment unit
222 Traffic control unit
300 Application Server

Claims (5)

  1. An apparatus for a wireless base station capable of communicating with a plurality of wireless terminals,
    A buffer memory, a control unit for the buffer memory, a transmission unit, and a reception unit,
    The control means includes a power saving mode in which communication with a certain terminal among the plurality of wireless terminals includes a sleep state in which neither transmission nor reception is performed, and an activation state in which data can be transmitted or received. In response to receiving the data to be transmitted to the certain terminal, the data to be transmitted is accumulated in the area for the certain terminal in the buffer memory,
    When the communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the control unit may change the area of the buffer memory into the buffer memory. An apparatus for continuously reading the data to be transmitted until there is no more data, and causing the transmitting means to continuously transmit the data to be transmitted.
  2. A wireless terminal communicating with a wireless base station,
    A buffer memory, a control unit for the buffer memory, a transmission unit, and a reception unit,
    The transmission unit and the reception unit have a power saving mode configured of a sleep state in which neither transmission nor reception is performed and an activation state in which data transmission or reception can be performed,
    The control of the control means, in response to receiving the data to be transmitted, stores the data to be transmitted in the buffer memory,
    The transmission means shifts to an activated state when a predetermined timing or a predetermined buffer accumulation amount is reached, and reads out the data to be transmitted from the buffer memory until there is no more data in the buffer memory, and continuously reads the data. Transmit, when neither transmission nor reception occurs during a predetermined time, shift to the sleep state,
    The wireless terminal according to claim 1, wherein the predetermined timing interval is longer than the predetermined time.
  3. A program for a device capable of communicating with a plurality of wireless terminals, wherein communication with a terminal among the plurality of wireless terminals is capable of transmitting or receiving data in a suspended state in which neither transmission nor reception is performed. In the power saving mode configured with the active state, in response to reception of data to be transmitted to the certain terminal, the data to be transmitted is stored in the area for the certain terminal in the buffer memory. The step of causing
    When the communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the data in the buffer memory is depleted from the area of the buffer memory. Continuously reading the data to be transmitted and continuously transmitting the data to be transmitted,
    A program operable to execute
  4. Storing the data to be transmitted in a buffer memory in response to receiving the data to be transmitted;
    When a predetermined timing or a predetermined buffer accumulation amount is reached, the state shifts to an activation state in which data transmission is possible, and the data to be transmitted is read out continuously from the buffer memory until data in the buffer memory is exhausted. Transmitting, when neither transmission nor reception occurs during a predetermined time, a step of shifting to a sleep state in which neither transmission nor reception is performed;
    A program for a wireless terminal communicating with a wireless base station, operable to execute
    The program is characterized in that the predetermined timing interval is longer than the predetermined time.
  5. A communication method in a device capable of communicating with a plurality of wireless terminals,
    When communication with a terminal among the plurality of wireless terminals is in a power saving mode, the data to be transmitted is stored in a buffer memory in response to reception of data to be transmitted to the terminal. Accumulating in the area for the certain terminal;
    When the communication with the certain terminal is in the power saving mode, when a predetermined timing or a predetermined buffer storage amount is reached, the data in the buffer memory is depleted from the area of the buffer memory. Continuously reading the data to be transmitted and continuously transmitting the data to be transmitted,
    Communication method including.
JP2002326785A 2002-11-11 2002-11-11 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 Withdrawn JP2004165791A (en)

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JP2008503990A (en) * 2004-06-22 2008-02-07 株式会社エヌ・ティ・ティ・ドコモ Packet communication method and apparatus for power mode recognition
JP2008071267A (en) * 2006-09-15 2008-03-27 Fuji Xerox Co Ltd Power saving system and power saving program
JP2008072194A (en) * 2006-09-12 2008-03-27 Fujitsu Ltd Uplink communication method and wireless terminal in wireless communication system
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JP2010504029A (en) * 2006-09-14 2010-02-04 マーベル ワールド トレード リミテッド Ad hoc network power saving system and method
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US7991354B2 (en) 2004-07-21 2011-08-02 Hitachi, Ltd. Method of communication and base station
US7873380B2 (en) 2004-07-21 2011-01-18 Hitachi, Ltd. Method of communication and base station
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US8126149B2 (en) 2005-02-15 2012-02-28 Canon Kabushiki Kaisha Communication apparatus having power-saving communication function, and communication method
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US7983651B2 (en) 2007-02-07 2011-07-19 Kabushiki Kaisha Toshiba Communication apparatus, communication method and communication system
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