KR20130126415A - Apparatus and method for transmitting/receiving an aggregation frame in a communication system - Google Patents

Apparatus and method for transmitting/receiving an aggregation frame in a communication system Download PDF

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Publication number
KR20130126415A
KR20130126415A KR1020120050561A KR20120050561A KR20130126415A KR 20130126415 A KR20130126415 A KR 20130126415A KR 1020120050561 A KR1020120050561 A KR 1020120050561A KR 20120050561 A KR20120050561 A KR 20120050561A KR 20130126415 A KR20130126415 A KR 20130126415A
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South Korea
Prior art keywords
frame
channel state
integrated
density
block ack
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KR1020120050561A
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Korean (ko)
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정하경
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삼성전자주식회사
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Priority to KR1020120050561A priority Critical patent/KR20130126415A/en
Publication of KR20130126415A publication Critical patent/KR20130126415A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a method for transmitting an integrated frame of a transmitting terminal in a communication system, the method comprising: transmitting an integrated frame generated using a first frame density to a receiving terminal, and a block Ack (Block Ack) for the integrated frame from the receiving terminal. receiving an acknowledgment frame, estimating a channel state of the receiving terminal using the Block Ack frame, and determining a second frame density to be used for an integrated frame to be transmitted later according to the channel state. The frame integration degree indicates the number of subframes included in the integrated frame, and the block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame.

Description

Apparatus and method for integrated frame transmission / reception in a communication system {APPARATUS AND METHOD FOR TRANSMITTING / RECEIVING AN AGGREGATION FRAME IN A COMMUNICATION SYSTEM}

The present invention relates to an integrated frame transmission / reception apparatus and method in a communication system.

The next generation wireless local access network (WLAN) system, which is a representative communication system, supports a frame of a medium access control (MAC) layer to support a high data rate. A frame aggregation mechanism is provided to reduce overhead such as inter-frame space, preamble, and the like. In the case of the Institute of Electrical and Electronics Engineers (IEEE) 802.11n standard, which is a representative standard used in the next-generation wireless LAN system, up to 64 frames may be supported.

By the way, such frame aggregation may increase the data rate, but may also increase the transmission time of an aggregation frame.

By the way, such frame aggregation may increase the data rate, but may also increase the transmission time of an aggregation frame.

However, when the transmission time of the integrated frame is increased in this way, the state of the wireless channel is changed within the transmission time of the integrated frame due to channel fading or the like, so that some subframes of the subframes included in the integrated frame are changed. Since there is a possibility of transmission failure, a method of determining a frame aggregation size corresponding to a channel state, that is, a method of determining the number of subframes included in an integrated frame, rather than always configuring an integrated frame having a maximum size. Need is required.

The present invention proposes an integrated frame transmission / reception apparatus and method in a communication system.

In addition, the present invention proposes an apparatus and method for transmitting / receiving an integrated frame by adjusting the frame integration degree in accordance with a channel state of a receiving terminal in a communication system.

In addition, the present invention proposes an apparatus and method for transmitting / receiving an integrated frame by adjusting the frame density without the need for channel state feedback in a communication system.

The apparatus proposed in the present invention comprises: A transmitting terminal of a communication system, comprising: a transmitting unit for transmitting an integrated frame generated using a first frame density to a receiving terminal, and a block acck (acknowledgement) frame for the integrated frame from the receiving terminal. A receiving unit and a control unit for estimating a channel state of the receiving terminal using the Block Ack frame, and determining a second frame density to use for an integrated frame to be transmitted later corresponding to the channel state; Denotes the number of subframes included in an integrated frame, and the Block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame.

Another apparatus proposed in the present invention is a system comprising: A receiving terminal of a communication system, comprising: a receiving unit for receiving an integrated frame generated using a frame integration degree from a transmitting terminal, a block acck (acknowledgement) frame for the integrated frame, and generating the block acck frame The transmitting unit transmitting to the transmitting terminal and the frame integration degree indicate the number of subframes included in an integrated frame, and the Block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame. The degree of integration is characterized in that it is determined corresponding to the channel state of the receiving terminal.

The method proposed by the present invention comprises: A method for transmitting an integrated frame of a transmitting terminal in a communication system, the method comprising: transmitting an integrated frame generated using a first frame density to a receiving terminal, and a block acck (acknowledgement) for the integrated frame from the receiving terminal; Receiving a frame, estimating a channel state of the receiving terminal using the Block Ack frame, and determining a second frame integration degree to be used for an integrated frame to be transmitted later according to the channel state; The frame density indicates the number of subframes included in an integrated frame, and the block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame.

Another method proposed by the present invention is as follows. An integrated frame receiving method of a receiving terminal in a communication system, the method comprising: receiving an integrated frame generated using a frame integration degree from a transmitting terminal, generating a block Ack (acknowledgement) frame for the integrated frame, and Transmitting a Block Ack frame to the transmitting terminal, and the frame density indicates the number of subframes included in an integrated frame, and the Block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame. The frame integration degree is determined according to the channel state of the receiving terminal.

The present invention has the effect of making it possible to determine the frame density in a communication system.

In particular, the present invention has the effect that it is possible to determine the frame density according to the channel state in the communication system without receiving a separate channel state feedback from the receiving terminal.

In this way, it is possible to determine the frame density according to the channel state without receiving the channel state feedback from the receiving terminal separately, so that signaling for the separate channel state feedback is unnecessary, and therefore, the radio resource for the channel state feedback is eliminated. Waste can be prevented, which in turn has the effect of increasing the resource efficiency of the communication system.

1 is a view schematically showing a frame structure according to a frame integration process in an IEEE 802.11n system according to an embodiment of the present invention
2 is a signal flow diagram schematically illustrating a process of determining frame density in an IEEE 802.11n system according to an embodiment of the present invention.
3 is a flowchart schematically illustrating a process of determining a frame density by a transmitting terminal in an IEEE 802.11n system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the present invention will be described, and the description of other parts will be omitted so as not to obscure the gist of the present invention.

The present invention proposes an apparatus and method for transmitting / receiving an aggregation frame in a communication system.

In addition, the present invention proposes an apparatus and method for transmitting / receiving an integrated frame by adjusting the frame integration degree in accordance with a channel state of a receiving terminal in a communication system.

In addition, the present invention proposes an apparatus and method for transmitting / receiving an integrated frame by adjusting the frame density without the need for channel state feedback in a communication system.

Hereinafter, in the following description of the present invention, it is assumed that the communication system is a next generation wireless local access network (WLAN) system, and the next generation wireless LAN system is an IEEE 802.11 (Institute of Electrical and Electronics Engineers) 802.11 as an example. It is assumed that n standard is used. Hereinafter, for convenience of description, a next generation WLAN system using the IEEE 802.11n standard will be referred to as an "IEEE 802.11n system". In addition, in the following description, the frame integration degree indicates the number of sub-frames included in the integrated frame.

1 is a diagram schematically illustrating a frame structure according to a frame aggregation process in an IEEE 802.11n system according to an embodiment of the present invention.

Prior to describing FIG. 1, in the IEEE 802.11n system, the frame aggregation scheme is largely referred to as an Aggregate-Medium Access Control (A-MSDU) Service Data Unit (A-MSDU). And an Aggregate-MAC Protocol Data Unit (A-MPDU) (hereinafter, referred to as 'A-MPDU'). The frame structure shows a frame structure when using the A-MPDU scheme in the IEEE 802.11n system.

Referring to FIG. 1, one A-MPDU frame 110 is configured by connecting a plurality of A-MPDU subframes 100 in succession. For example, it is assumed that the A-MPDU frame 110 includes n A-MPDU subframes, that is, A-MPDU subframe 1 to A-MPDU subframe n.

The A-MPDU subframe 100 is referred to as a MAC Protocol Data Unit (MPDU) configured in a Medium Access Control (MAC) layer. MPDU field (filed) 104 including a), and an MPDU delimiter field including an MPDU delimiter (hereinafter referred to as a 'delimiter') which is a delimiter for distinguishing A-MPDU subframes. 102, and a Pad field 106 including a pad (Pad, hereinafter referred to as 'Pad') used to fit the length of the A-MPDU subframe in multiples of 4 bytes.

In this way, the A-MPDU frame 110 generated in the MAC layer is delivered to a PHYsical layer (hereinafter referred to as a 'PHY layer'), and the PHY layer is a PHY layer PDU (PPDU: Physical PDU, hereinafter '). PPDU '). The PPDU includes a preamble field including a preamble, a PSDU field including a PHY layer service data unit (hereinafter referred to as a PSDU), and a tail. It includes a tail field and a pad field including a pad.

1 illustrates a frame structure according to a frame integration process in an IEEE 802.11n system according to an embodiment of the present invention. Next, referring to FIG. 2, a frame integration degree is determined in an IEEE 802.11n system according to an embodiment of the present invention. The process of doing this will be described.

FIG. 2 is a signal flowchart schematically illustrating a process of determining frame density in an IEEE 802.11n system according to an embodiment of the present invention.

Referring to FIG. 2, first, in step 202, a station (STA) 1 200 generates an aggregate frame, that is, an A-MPDU frame, to be transmitted to the terminal 2 220. In step 202, it is assumed that the frame integration degree is predetermined. Accordingly, the terminal 1 200 configures an integrated frame using the predetermined frame integration degree. In this case, the frame density may be determined according to the channel state of the receiving terminal when transmitting the first integrated frame using the frame density set as a default in the IEEE 802.11n system. Can be.

In step 204, the terminal 1 200 transmits the configured integrated frame to the terminal 2 220 (A-MPDU). In step 206, the terminal 2 220 receiving the integrated frame from the terminal 1 200 checks whether an error occurs in each subframe included in the received integrated frame, and provides information on whether each subframe is successfully received. A block Ack (block Ack (acknowledgement), hereinafter referred to as Block Ack) frame is generated.

Then, in step 208, the terminal 2 220 transmits a Block Ack frame to the terminal 1 (200). In step 210, the terminal 1 200 that receives the block acknowledgment frame analyzes the block acknowledgment frame and uses an error pattern, that is, a subframe error pattern, for each subframe included in the previously transmitted aggregated frame. By estimating the channel state of the terminal 2 (220). That is, the Block Ack frame is a frame indicating whether or not each subframe included in the corresponding integrated frame is an error.

In step 212, the terminal 1 200 determines the frame integration degree to be used for the next integrated frame using the estimated channel state. For example, if the channel state of the terminal 2 220 is changing relatively fast, that is, if the channel state change rate value exceeds a preset channel state change rate threshold, the frame density to be used for the next integrated frame is previously integrated. The error probability of the subframe may be reduced by determining lower than the frame integration degree used for the frame, that is, reducing the number of subframes included in the integrated frame. On the contrary, if the channel state of the terminal 2 220 is not changing or is relatively slow, that is, if the channel state change rate value is less than or equal to the channel state change rate threshold, the frame density to be used for the next integrated frame is determined. It can be kept equal or increased to the same frame density used for the previous integrated frame.

Meanwhile, various methods of detecting the channel state change rate value may be implemented, and a detailed description thereof will be omitted. In addition, since the operations of steps 202 to 212 are repeated after step 212, a detailed description thereof will be omitted.

In FIG. 2, a process of determining a frame integration degree in an IEEE 802.11n system according to an embodiment of the present invention has been described. Next, with reference to FIG. A process of determining the frame density will be described.

3 is a flowchart schematically illustrating a process of determining a frame density by a transmitting terminal in an IEEE 802.11n system according to an embodiment of the present invention.

Referring to FIG. 3, in step 300, the transmitting terminal determines the frame integration degree of the integrated frame to be transmitted at the corresponding time point and proceeds to step 302. Here, the transmitting terminal determines the frame integration degree using the channel state of the receiving terminal. In step 302, the transmitting terminal configures an A-MPDU frame using the determined frame integration degree, and proceeds to step 304. In step 304, the transmitting terminal transmits the configured A-MPDU frame to the receiving terminal. In step 306, the transmitting terminal waits for reception of a Block Ack frame for the transmitted A-MPDU frame from the receiving terminal.

In this way, if the Block Ack frame is received from the receiving terminal in step 308 while waiting to receive the Block Ack frame, the flow proceeds to step 310. In step 310, the transmitting terminal detects an error pattern, that is, a subframe error pattern, for each of the subframes included in the integrated frame included in the received Block Ack frame, and uses the error pattern of the receiving terminal. The channel state is estimated and the process returns to step 300 above.

On the contrary, even if the block Ack frame is not received even if the block Ack frame is continuously received, the transmitting terminal returns to step 304.

Although not illustrated in a separate drawing, each of the transmitting terminal and the receiving terminal may include a control unit, a transmitting unit, and a receiving unit.

Here, the operation of the transmitting terminal and the receiving terminal will be briefly described as follows.

First, the operation of the transmitting terminal will be briefly described as follows.

First, the receiving unit receives a Block Ack frame received from the receiving terminal under the control of the control unit, the control unit detects the sub frame error pattern using the Block Ack frame received from the receiving terminal, and the sub frame error pattern Determining the frame integration degree to use for the integrated frame to be transmitted at this time using. In addition, the transmitting unit generates an integrated frame under the control of the control unit and transmits it to the receiving terminal.

Secondly, the operation of the receiving terminal will be briefly described as follows.

First, the receiving unit receives an integrated frame from the transmitting terminal under the control of the control unit, and the control unit controls the transmitting unit to transmit a Block Ack frame for the integrated frame received from the transmitting terminal to the transmitting terminal.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (10)

An integrated frame transmission method of a transmitting terminal in a communication system,
Transmitting an integrated frame generated using the first frame density to a receiving terminal,
Estimating a channel state of the receiving terminal by using the Block Ack frame when receiving a block Ack (acknowledgement) frame for the integrated frame from the receiving terminal;
Determining a second frame integration degree to be used for an integrated frame to be transmitted later according to the channel state;
The frame density indicates a number of subframes included in an integrated frame, and the Block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame.
The method of claim 1,
Estimating a channel state of the receiving terminal by using the Block Ack frame;
Detecting an error pattern of subframes included in the Block Ack frame, and detecting a channel state change rate value of the receiving terminal by using the detected error pattern.
3. The method of claim 2,
Determining a second frame integration degree to use for an integrated frame to be transmitted later corresponding to the channel condition;
And comparing the channel state change rate value with a threshold channel state change rate value and determining a second frame density according to the comparison result.
The method of claim 3,
Comparing the channel state change rate value with a threshold channel state change rate value and determining a second frame density according to the comparison result;
When the channel state change rate value exceeds the threshold channel state change rate value, the second frame density is reduced than the first frame density, and when the channel state change rate value is less than or equal to the threshold channel state change rate value, the second And determining to increase or maintain a frame density greater than the first frame density.
In the transmitting terminal of the communication system,
A transmitting unit which transmits an integrated frame generated using the first frame density to a receiving terminal,
A receiving unit for receiving a block Ack (acknowledgement) frame for the integrated frame from the receiving terminal;
A control unit for estimating a channel state of the receiving terminal using the Block Ack frame, and determining a second frame integration degree to be used for an integrated frame to be transmitted later corresponding to the channel state;
The frame density indicates a number of subframes included in an integrated frame, and the Block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame.
The method of claim 5,
And the control unit detects an error pattern of subframes included in the Block Ack frame, and detects a channel state change rate value of the receiving terminal using the detected error pattern.
The method according to claim 6,
And the control unit compares the channel state change rate value with a threshold channel state change rate value and determines a second frame density according to the comparison result.
The method of claim 7, wherein
The control unit decreases the second frame density than the first frame density when the channel state change rate value exceeds a threshold channel state change rate value, and the channel state change rate value is equal to or less than a threshold channel state change rate value. And if it is determined to increase or maintain the second frame density than the first frame density.
An integrated frame receiving method of a receiving terminal in a communication system,
Receiving an integrated frame generated using the frame integration degree from a transmitting terminal,
Generating a block Ack (acknowledgement) frame for the integrated frame and transmitting the block Ack frame to the transmitting terminal;
The frame density indicates the number of subframes included in an integrated frame, the Block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame, and the frame density corresponds to a channel state of the receiving terminal. The integrated frame receiving method of the receiving terminal, characterized in that.
In a reception terminal of a communication system,
A receiving unit which receives an integrated frame generated using the frame density from a transmitting terminal,
A transmitting unit for generating a block Ack (acknowledgement) frame for the integrated frame and transmitting the block Ack frame to the transmitting terminal;
The frame density indicates the number of subframes included in an integrated frame, the Block Ack frame indicates whether an error occurs for each of the subframes included in the integrated frame, and the frame density corresponds to a channel state of the receiving terminal. Receiving terminal, characterized in that determined to.
KR1020120050561A 2012-05-12 2012-05-12 Apparatus and method for transmitting/receiving an aggregation frame in a communication system KR20130126415A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017084364A1 (en) * 2015-11-17 2017-05-26 Xidian University Communication device, and communication method for frame aggregation and transmission

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017084364A1 (en) * 2015-11-17 2017-05-26 Xidian University Communication device, and communication method for frame aggregation and transmission
US10708006B2 (en) 2015-11-17 2020-07-07 Xidian University Communication device, and communication method for frame aggregation and transmission

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