KR20050025374A - Method and system for improving system performance with extended acknowledgement - Google Patents

Method and system for improving system performance with extended acknowledgement Download PDF

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Publication number
KR20050025374A
KR20050025374A KR1020030062404A KR20030062404A KR20050025374A KR 20050025374 A KR20050025374 A KR 20050025374A KR 1020030062404 A KR1020030062404 A KR 1020030062404A KR 20030062404 A KR20030062404 A KR 20030062404A KR 20050025374 A KR20050025374 A KR 20050025374A
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KR
South Korea
Prior art keywords
error rate
frame
transmitting device
transmitting
rate
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KR1020030062404A
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Korean (ko)
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홍성설
최윤화
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삼성전자주식회사
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Priority to KR1020030062404A priority Critical patent/KR20050025374A/en
Publication of KR20050025374A publication Critical patent/KR20050025374A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/04Error control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/10Flow control between communication endpoints
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Abstract

A method and system for enhancing system performance by using an extended ACK frame are provided to transmit/receive data at a suitable transmission rate according to a current communication situation by checking a communication situation in real time between a transmission device and a reception device. A transmission device transmits a certain frame to a reception device during an allocated channel time(S610). The reception device calculates an error rate of the frame which has been received from the transmission device(S620). It is checked whether the calculated error rate is within a tolerance range(S630). A data transmission rate of the transmission device is controlled according to the determined result(S640-S660).

Description

Method and System for Improving System Performance with Extended Acknowledgment

The present invention relates to a method for improving performance throughout a system by efficiently utilizing limited communication resources in wireless communication. More particularly, the present invention relates to a method of effectively using an acknowledgment frame that frequently occurs when communicating between devices existing on a wireless personal area network (PAN).

Almost all frames between devices operating in a wireless PAN environment are accompanied by an ACK frame. That is, when a transmitting device (source device) transmits a command frame or data frame to a receiving device (destination device), the receiving device receives an ACK frame indicating that the frame is properly received. The transmission is sent to the transmitting device. Whenever one frame is received as described above, an ACK frame that immediately informs that the reception has been properly received is called an immediate ACK frame (hereinafter, referred to as Imm-ACK). The structure of the Imm-ACK frame is composed of only the MAC header, and the function of the Imm-ACK frame is to simply confirm whether the command frame or the data frame transmitted immediately before the Imm-ACK frame is received.

1 shows a structure of an Imm-ACK frame according to IEEE 802.15.3. Since the Imm-ACK frame 100 does not have a MAC frame body, the Imm-ACK frame 100 has a structure of a MAC frame header. The MAC frame header 100 includes a frame control field 110, a PNID field 120, a DestID field 130, an SrcID field 140, a fragmentation control field 150, and a stream index field 160.

The Frame control field 110 is again a Protocol version field 111, Frame type field 112, SEC field 113, ACK policy field 114, Retry field 115, More data field 116 and Reserved Field 117. In the Protocol version field 111, when a protocol is defined by defining a structure of a frame, the version of the protocol is recorded. Even if there is a change in the frame structure, the version is not increased when the basic compatibility with the existing protocol is maintained. The frame type field 112 is a field for recording whether the present frame is a beacon frame, an ACK frame, a command frame, or a data frame. In addition, the SEC field 113 is a field for recording whether to apply security to a frame using a security ID. 1 means security, 0 means no security. In addition, the ACK policy field 114 is a field for recording which ACK policy among No ACK, Immediate ACK, and Delayed ACK is used. The Retry field 115 is a field for recording whether the present frame is the first frame to be sent or a frame for retransmission. Further, the More data field 116 is a field for recording whether there is data to be transmitted further, that is, whether to use the remaining channel time among the totally allocated channel time allocation (CTA). Finally, the Reserved field 117 is a field that is reserved.

Hereinafter, the remaining fields other than the frame control field 110 will be described. The PNID field 120 is a field for recording a PNID that uniquely identifies the piconet. In addition, the DestID field 130 is a field for recording the ID of the device receiving the frame, and the SrcID field 140 is a field for recording the ID of the device transmitting the frame. The Fragmentation control field 150 is a field for recording information used to fragment and recombine a frame. The stream index field 160 is a field for recording a stream index that uniquely identifies a stream to which the frame belongs. That is, the same stream index is recorded in a frame belonging to the same stream.

2 is a hierarchical structure according to IEEE 802.15.3 existing in each device.

The MAC layer 220 and the PHY physical layer 230 each have a management entity. This is called a MAC layer management entity (MLME) 240 and a PHY layer management entity (PLME) 250, respectively. These entities provide a service interface to perform layer management funtion at each layer.

In addition, a device management entity (DME) 260 must be present to perform the operation in the correct MAC. These DMEs operate independently for each layer, gathering layer-dependent status information from each layer from management entities in different layers, and likewise setting the layer-specific parameters for each layer. Has the function to set.

Various service access points (SAPs) serve as a gate for transferring information between the various entities. Information between PHY layer 230 and MAC layer 220 is conveyed by PHY SAP 203, and information between MAC layer 220 and FCSL 210 is conveyed by MAC SAP 202. The information between the DME 260 and the MLME 240 is transferred by the MLME SAP 204, and the information between the DME 260 and the PLME 250 is transferred by the PLME SAP 205. In addition, information between the MLME 240 and the PLME 250 is carried by the MLME-PLME SAP 206.

3 illustrates a process of transmitting and receiving a command frame between a device and a PNC. Here, MLME-XXX means primitives defined in IEEE 802.15.3. For example, MLME-ASSOCIATE, MLME-PNC-HANDOVER, MLME-CREATE-STREAM, MLME-REMOTE-SCAN, MLME-TX- POWER-CHANGE.

First, the MLME-XXX.request 301 is generated by the DME 310 of the device side and delivered to the MLME 320. The MLME 320 transmits a radio frequency (RF) signal to the air through the MAC layer and the PHY layer. The RF signal contains information of the XXX request command frame 302. The RF signal is demodulated in the PHY layer on the PNC side, and the command frame 302 is extracted. The command frame 302 is passed to the MLME 330 of the PNC after passing through the MAC layer on the PNC side. The MLME 330 of the PNC, which receives the command frame 302, generates a frame confirming that the frame 302 has been received, that is, an Imm-ACK frame 303, and delivers it to the device side.

On the other hand, the command frame delivered to the MLME 330 of the PNC is delivered to the DME 340 of the PNC in the form of MLME-XXX.indication 304. Thereafter, the DME 340 of the PNC forwards the MLME-XXX.response 305 to the MLME 330 of the PNC in response, and the MLME 330 of the PNC receives an RF signal into the air through the MAC layer and the PHY layer. Send it. The RF signal contains information of the XXX response command frame 306. The RF signal is demodulated in the PHY layer on the device side, and the command frame 306 is extracted. The command frame 306 then passes to the device's MLME 320 after passing through the MAC layer on the device side. The MLME 320 of the device receiving the command frame 306 generates an Imm-ACK frame 307 confirming that the frame 306 has been received and transmits it to the PNC. On the other hand, the command frame delivered to the device's MLME 320 is delivered to the device's DME 310 in the form of MLME-XXX.confirm 308.

As described above, since an interval in which data can be transmitted and received between devices (for example, in the case of IEEE 802.15.3, a CTA (Channel Time Allocation) interval) is configured by exchanging data frames and ACK frames, an ACK frame is transmitted and received. It will occupy a significant portion of the interval. Therefore, in consideration of such a problem, there is a method of not using an ACK (No ACK Policy), or a method of sending an ACK at a time after receiving a certain number of data (Delayed ACK Policy). However, these methods have a problem in that stable communication cannot be guaranteed by generating frequent transmission errors in a wireless communication environment having a high data loss rate.

Therefore, if the Imm-ACK frame is frequently used in a wireless PAN environment, the Imm-ACK frame is not simply used to confirm that the frame has been correctly received, but the function is extended to improve the performance of the entire system. There is a need to find ways to improve performance.

The present invention has been made in view of the above problems, and an object thereof is to provide a method of more efficiently using an Imm-ACK frame transmitted between devices in a wireless communication environment.

To this end, the present invention devises a new Imm-ACK frame (which is defined as an extended Imm-ACK frame or an extended ACK frame) that extends the functionality of the conventional Imm-ACK frame, which is defined between the transmitting device and the receiving device. It has a function that can transmit information on the data transmission situation in real time.

In addition, an object of the present invention is to provide a method for improving overall system performance by efficiently using an Imm-ACK frame of a device operating in a wireless communication environment as described above.

In order to achieve the above object, the method according to the present invention includes a first step of transmitting a predetermined frame to a receiving device during a channel time allocated to the transmitting device; Calculating an error rate of a frame received from the transmitting device; Determining whether the calculated error rate is within an allowable range; And a fourth step of adjusting the data rate of the transmitting device according to the determined result.

In order to achieve the above object, the method according to the present invention includes a first step of transmitting a predetermined frame to a receiving device during a channel time allocated to the transmitting device; Calculating an error rate of a frame received from the transmitting device; Determining whether the calculated error rate is within an allowable range; And a fourth step of adjusting the transmission power of the transmission device according to the determined result.

In order to achieve the above object, in the wireless PAN system according to the present invention, the receiving device calculates an error rate of a frame received from the transmitting device, determines whether the calculated error rate is within an allowable range, and A receiving device transmitting to the transmitting device; And a transmitting device that transmits a predetermined frame to the receiving device for an allocated channel time, receives a determination result from the receiving device, and adjusts its own data rate using the result.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4A shows the structure of an extended Imm-ACK frame according to the present invention. The extended Imm-ACK frame 400 is constructed using the structure of the conventional Imm-ACK frame of IEEE 802.15.3. Accordingly, like the Imm-ACK frame 100, the Frame control field 110, the PNID field 120, the DestID field 130, the SrcID field 140, the fragment control field 150, and the stream index field 160 may be replaced. Have it as it is. In addition, like the Imm-ACK 100, the frame control field 110 may include a protocol version field 111, a frame type field 112, a SEC field 113, an ACK policy field 114, and a retry field 115. , More data field 116. However, in the conventional Imm-ACK 100, the Enough field 118 is configured by using a part of the reserved field 117 that occupies b11 to b15 in the frame control field 110. That is, it is assumed that the Enough field 118 occupies two bits from b11 to b12. Fields other than the Enough field 118 are the same as in the conventional Imm-ACK 100.

4B is a table showing values and information of the Enough field 118. The Enough field 118 may have four values, meaning as follows.

First, when b12 is 0 in the field and b11 is 0, that is, when the value of the field is '00', it means 'Same rate'. The receiving device indicates that the command frame or data frame transmitted from the transmitting device is correctly received. Thus, the transmitting device maintains the current " MAC frame body data rate " at the current value. The " MAC frame body data rate " is a value recorded in a PHY header frame and indicates a transmission rate of a MAC frame. This will be described in detail in the description of FIG. 5B.

Second, when b12 is 0 and b11 is 1 in the field, that is, when the value of the field is "01", it means "Lower rate". The receiving device indicates that the command frame or data frame transmitted from the transmitting device is not correctly received. Thus, the transmitting device changes the current " MAC frame body data rate " to a lower rate.

Third, when b12 is 1 and b11 is 0 in the field, that is, when the field value is "10", it means "Higher rate". Although the receiving device correctly receives the command frame or data frame transmitted from the transmitting device, the error rate is too low, so that a higher transmission rate can be used. Thus, the transmitting device changes the current " MAC frame body data rate " to a higher rate.

Fourth, when b12 is 1 and b11 is 1 in the field, that is, when the value of the field is '11'.

4C shows a criterion for determining an error rate.

After receiving the command frame or the data frame from the transmitting device, the receiving device examines the error rate, and if it is higher than the first reference error rate (hereinafter referred to as Θ 1 ) (section A), the error rate is higher than the allowable value. To judge. Accordingly, " 01 " is recorded in the Enough field 118 of the extended Imm-ACK frame 400 for the received frame to indicate that it is " Lower rate. &Quot;

If the error rate is the first reference error rate Θ 1 and the second reference error rate (hereinafter referred to as Θ 2 ) If it exists in between (section B), it is judged that the error rate is not too much or too small. Accordingly, " 00 " is recorded in the Enough field 118 of the extended Imm-ACK frame 400 to indicate that it is " Same rate ".

If the error rate is lower than Θ 2 (section C), it is determined that the error rate is too small. Accordingly, " 10 " is recorded in the Enough field 118 of the extended Imm-ACK frame 400 to indicate that it is " Higher rate ".

The error rate may be based on a packet error rate (PER) representing a ratio of packets that are not received and are lost among all transmitted packets. In 802.15.3, a minimum PER of 8% is determined to be available for communication. Based on this, Θ 1 is set to 8%. Θ 2 can be set to 5%. However, this is only an example, and any number of other values can be selected. In addition, the criterion for determining the error rate may select another criterion such as a bit error rate (BER) in addition to the PER.

5A shows the structure of a PHY header frame. The PHY header frame 500 includes a Seed Identifier field 510, a MAC frame body data rate field 520, and a payload length field 530. The Seed Identifier field 510 is a 2-bit field and records a value for selecting a seed for a data scrambler defined in 802.11.5. The MAC frame body data rate field 520 is a 3-bit field and records a value indicating the rate (rate) at which the MAC frame is transmitted. The payload length field 530 is an 11-bit field and records the length of the frame payload in octet format.

5B is a table illustrating a modulation scheme according to MAC frame body data rate.

In IEEE 802.15.3, the data rate is selected from 11, 22, 33, 44, and 55 Mb / s. In each case, the modulation scheme in the PHY layer is different. In case of 11Mb / s, Quadrature Phase Shift Keying-Trellis Coded Modulation (QPSK-TCM) is used, and in case of 22Mb / s, Differential Quadrature Phase Shift Keying (DQPSK) is used. 16-QAM-TCM (16-QAM-TCM) for 33Mb / s, 32-QAM-TCM for 44Mb / s, and 64-QAM-TCM for 55Mb / s. Use the method.

As shown in FIG. 5B, the data rate is determined according to a value recorded in the MAC frame body data rate field 520 of the PHY header frame 500, that is, b4, b3, and b2 bits. That is, when the value of the field 520 is '000', 11Mb / s is represented, and when '001' is '22Mb / s'. In the case of "010", 33 Mb / s is represented, and in "011", 44 Mb / s is represented. In addition, when the value of the field 520 is "100", it represents 55 Mb / s.

When the data rate is to be changed according to the value of the Enough field, the data rate is eventually adjusted by changing the value of the MAC frame body data rate field 520. As such, the data rate should be selected from five types. Therefore, if the data rate is to be increased according to the value of the Enough field, it is increased by 11 Mb / s. Will be.

6 is a flowchart illustrating the overall operation of the present invention.

As mentioned in the prior art, assume that two devices are associated with a particular piconet. The two devices are assigned a specific channel time allocation (CTA) or management CTA (MCTA) to communicate with each other.

First, the transmitting device checks whether it is a CTA (or MCTA) assigned to it, and transmits a data frame (or command frame) to the receiving device during the CTA (or MCTA) assigned to the device (S610).

Next, the receiving device calculates a packet error rate (PER) of the data frame (or command frame) received from the transmitting device (S620).

The calculated PER value is compared with Θ 1 and Θ 2 (S630). The comparison results are divided into three types.

First, if the calculated PER is greater than Θ 1 ,

The receiving device sets the Enough field of the extended Imm-ACK frame to '01' and transmits the extended Imm-ACK frame to the transmitting device (S640). The transmitting device receiving the extended Imm-ACK frame from the receiving device changes the current " MAC frame body data rate " to a lower value (S641).

Second, if the calculated PER is greater than Θ 2 and less than Θ 1 ,

The receiving device sets the Enough field of the extended Imm-ACK frame to '00' and transmits the extended Imm-ACK frame to the transmitting device (S650). Then, the transmitting device that receives the extended Imm-ACK frame from the receiving device maintains the current " MAC frame body data rate " (S651).

Third, if the calculated PER is less than Θ 2 ,

The receiving device sets the Enough field of the extended Imm-ACK frame to '10' and transmits the extended Imm-ACK frame to the transmitting device (S660). The transmitting device that receives the extended Imm-ACK frame from the receiving device changes the current " MAC frame body data rate " to a higher value (S661).

As described above, after setting " MAC frame body data rate " to an appropriate value using the Enough field, if the transmitting device continues to have a data frame (or command frame) to transmit (S670), the process returns to the first step and returns to the next frame. Start the transfer.

As such, the extended Imm-ACK frame defines an Enough field, and the Enough field has information indicating the degree of reception of a frame transmitted from the transmitting device. Therefore, by confirming the value of the Enough field, the transmitting device can appropriately change the " MAC frame body data rate ", thereby transmitting data at a transmission rate suitable for the current communication situation.

In FIG. 6, an example of transmitting data by setting a suitable data rate (transmission rate) according to a communication situation may be used. However, the present technology may be applied to controlling the power of the device. In the case where the transmitting device transmits data to the receiving device, if the PER is greater than or equal to 1, the transmission error can be reduced by increasing the power of the transmitting device by a predetermined value instead of lowering the transmission rate as described above. If the PER is greater than Θ 2 and less than Θ 1 , the power of the existing transmission device may be kept as it is. If the PER is less than Θ 2 , the power consumption may be reduced by reducing the power of the transmission device by a predetermined value. Can be reduced. The predetermined value may be defined and used by the user as needed. Since this process only needs to be modified to this process in steps S640, S651, and S661 in FIG. 6, a separate flowchart will be omitted.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

According to the present invention, it is possible to use a given communication resource more efficiently by extending the function of the Imm-ACK frame.

According to the present invention, by confirming the communication status between the transmitting device and the receiving device in real time, it is possible to transmit and receive data at an appropriate transmission rate according to the current communication situation.

1 is a view showing the structure of an Imm-ACK frame according to IEEE 802.15.3.

2 illustrates a hierarchical structure in accordance with IEEE 802.15.3 existing in each device.

3 is a diagram illustrating a process of transmitting and receiving a command frame between a device and a PNC.

4A illustrates the structure of an extended Imm-ACK frame according to the present invention.

4B is a table showing values and information of an Enough field.

4C is a diagram illustrating a criterion for determining an error rate.

5A illustrates the structure of a PHY header frame.

5b is a table showing a modulation scheme according to MAC frame body data rate.

6 is a flowchart illustrating the overall operation of the present invention.

Claims (15)

  1. A data transmitting / receiving method on a wireless PAN in which a receiving device receiving a predetermined frame from a transmitting device transmits an ACK frame for the frame to the transmitting device,
    Transmitting a predetermined frame to a receiving device during a channel time allocated to the transmitting device;
    Calculating an error rate of a frame received from the transmitting device;
    Determining whether the calculated error rate is within an allowable range;
    And a fourth step of adjusting a data rate of the transmitting device according to the determined result.
  2. 2. The method of claim 1, wherein the predetermined frame is a data frame or a command frame.
  3. 2. The method of claim 1, wherein the error rate is a Packet Error Rate (PER).
  4. The method of claim 1, wherein the third step
    Selecting a first reference error rate and a second reference error rate;
    If the calculated error rate is greater than the first reference error rate, the error rate is determined to be high, and if it is between the first reference error rate and the second reference error rate, it is determined to be appropriate. If it is less than the second reference error rate, the error rate is determined to be small. And improving the system performance using the extended ACK frame, characterized in that it comprises a.
  5. The method of claim 4, wherein the fourth step
    If it is determined that the error rate is high, transmitting an extended ACK frame having an Enough field set to 01 to the transmitting device;
    Changing the “MAC frame body data rate” of the transmitting device to a lower value than a current value.
  6. The method of claim 4, wherein the fourth step
    If it is determined that the error rate is appropriate, transmitting an extended ACK frame with an Enough field set to 00 to the transmitting device;
    Maintaining the " MAC frame body data rate " of the transmitting device at a current value.
  7. The method of claim 4, wherein the fourth step
    If it is determined that the error rate is low, transmitting an extended ACK frame with an Enough field set to 10;
    Changing the “MAC frame body data rate” of the transmitting device to a higher value than a current value.
  8. A data transmitting / receiving method on a wireless PAN in which a receiving device receiving a predetermined frame from a transmitting device transmits an ACK frame for the frame to the transmitting device,
    Transmitting a predetermined frame to a receiving device during a channel time allocated to the transmitting device;
    Calculating an error rate of a frame received from the transmitting device;
    Determining whether the calculated error rate is within an allowable range;
    And a fourth step of adjusting the transmit power of the transmitting device according to the determined result.
  9. A wireless PAN system in which a receiving device receiving a predetermined frame from a transmitting device transmits an ACK frame for the frame to the transmitting device,
    The receiving device calculates an error rate of a frame received from the transmitting device, determines whether the calculated error rate is within an allowable range, and transmits the result to the transmitting device;
    And a transmitting device transmitting a predetermined frame to the receiving device for an allocated channel time, receiving a determination result from the receiving device, and using the result to adjust its data rate.
  10. The wireless PAN system of claim 9, wherein the predetermined frame is a data frame or a command frame.
  11. The wireless PAN system of claim 9, wherein the error rate is a Packet Error Rate (PER).
  12. 10. The method of claim 9, wherein determining whether the error rate is within an acceptable range
    After selecting a first reference error rate and a second reference error rate, if the calculated error rate is greater than the first reference error rate, the error rate is determined to be high, and if it is between the first reference error rate and the second reference error rate, it is determined to be appropriate. And determining that the error rate is less than the second reference error rate.
  13. 13. The method of claim 12, wherein adjusting the data rate
    If it is determined that the error rate is high, the extended ACK frame having the Enough field set to 01 is transmitted to the transmitting device, and the " MAC frame body data rate " of the transmitting device is changed to a value lower than the current value. Wireless PAN System.
  14. 13. The method of claim 12, wherein adjusting the data rate
    If it is determined that the error rate is appropriate, the extended ACK frame having the Enough field set to 00 is transmitted to the transmitting device, and the " MAC frame body data rate " of the transmitting device is maintained at a current value. PAN system.
  15. 13. The method of claim 12, wherein adjusting the data rate
    If it is determined that the error rate is low, the extended ACK frame having the Enough field set to 10 is transmitted to the transmitting device, and the "MAC frame body data rate" of the transmitting device is changed to a higher value than the current value. Wireless PAN System.
KR1020030062404A 2003-09-06 2003-09-06 Method and system for improving system performance with extended acknowledgement KR20050025374A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100973003B1 (en) * 2008-09-26 2010-07-30 고려대학교 산학협력단 Wireless communication method using channel-adaptive acknowledgement policy
KR101356481B1 (en) * 2006-10-13 2014-01-29 엘지전자 주식회사 Method for managing the power in the wireless network
US9668212B2 (en) 2013-10-14 2017-05-30 Electronics And Telecommunications Research Institute Physical layer low power communication method and apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101356481B1 (en) * 2006-10-13 2014-01-29 엘지전자 주식회사 Method for managing the power in the wireless network
KR100973003B1 (en) * 2008-09-26 2010-07-30 고려대학교 산학협력단 Wireless communication method using channel-adaptive acknowledgement policy
US9668212B2 (en) 2013-10-14 2017-05-30 Electronics And Telecommunications Research Institute Physical layer low power communication method and apparatus

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