KR101766525B1 - Method for retransimitting received data of using index coding in wireless communication - Google Patents

Method for retransimitting received data of using index coding in wireless communication Download PDF

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KR101766525B1
KR101766525B1 KR1020150058856A KR20150058856A KR101766525B1 KR 101766525 B1 KR101766525 B1 KR 101766525B1 KR 1020150058856 A KR1020150058856 A KR 1020150058856A KR 20150058856 A KR20150058856 A KR 20150058856A KR 101766525 B1 KR101766525 B1 KR 101766525B1
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packet
index
packets
terminal
coded
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KR1020150058856A
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KR20160127870A (en
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김주엽
최상원
송용수
백종현
김용규
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한국철도기술연구원
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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
    • H04L1/12—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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1809—Selective-repeat protocols

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

A data retransmission method using index coding of a wireless communication network of the present invention is a method of transmitting data by unicasting or multicasting a plurality of packets to the terminal in a unicasting or multicasting transmission environment in which a base station of a wireless communication network transmits data to a plurality of terminals Receiving an ACK signal or a NACK signal on a packet-by-packet basis, checking a packet not received by the terminal, retransmitting a packet not received by the terminal, index-encodes and transmits a plurality of packets not received, The terminal decodes the index-coded packet and selectively receives a packet not received by each terminal.
INDUSTRIAL APPLICABILITY According to the present invention, since it is possible to retransmit a packet necessary for all terminals while minimizing the number of packets to be retransmitted by index coding, efficient radio resources can be used and the transmission rate can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a data retransmission method using index coding of a wireless communication network,

The present invention relates to a data retransmission method, and more particularly, to a data retransmission method using index coding in a wireless communication network.

The present invention is a result of research conducted as part of the information communication and broadcasting research and development project of the future creation science department and information communication technology research promotion center. [Assignment: B0101-15-1361, title: national public safety service Development of terminal for disaster communication system based on LTE]

Recently, interest in mobile communication systems for special purposes such as disaster safety net or integrated rail network is increasing. Most special purpose mobile communication systems are being built on the basis of LTE communication networks that are used in commercial applications. In order to effectively support a group communication service such as a push-to-talk (PTT) in a mobile communication system, multicasting, which is a concept of transmitting the same data to a plurality of terminals, is essential. In the LTE network, evolved Multimedia Broadcast / Multimedia Service (eMBMS), which is a transmission method of multicasting concept, has already been applied, but it is not yet widely used in commercial applications. Therefore, it seems that eMBMS will be frequently used in special purpose mobile communication system based on LTE communication.

On the other hand, in the mobile communication environment, errors occur frequently in packet transmission. Therefore, a retransmission technique for correcting the errors is essential, and retransmission due to packet transmission errors is also necessary in a group communication environment through multicasting such as eMBMS.

However, as shown in FIG. 1, the go back-n or selective repeat ARQ method, which is one of ARQ (Automatic Repeat reQuest) techniques used for retransmission of a mobile communication network, sends one packet and transmits an ACK signal Unlike the STOP and WAIT method of receiving a NACK signal (negative acknowledgment signal), a packet in a specific window range (M packets in FIG. 1) is continuously transmitted, and an ACK signal or NACK (M + 1 to 2M-2 packet ranges) by sliding the window and transmitting a new packet (M + 1 to 2M-2 packet ranges) .

However, if such an ARQ scheme is applied to a multicasting transmission environment, a mobile station that has already successfully received a specific packet may receive redundant packets received due to retransmission, resulting in inefficient use of radio resources and unnecessary delay There is a problem.

On the other hand, in a conventional multicasting environment, a technique of efficiently transmitting a packet to a plurality of receivers using an index coding concept has been proposed. Here, in the index coding, when a plurality of packets are subjected to an exclusive OR (XOR) operation on the transmitting side and are transmitted as one packet, a single XOR-processed packet and an already- Is a concept of selectively decoding a desired packet through a decoding process corresponding to an exclusive-OR operation with a previously received packet.

However, the theory of index coding is only a level that verifies the performance with its own theory, and there is a limit to apply it as an algorithm suitable for the ARQ technique in which feedback is transmitted in real time in the actual LTE communication system.

Therefore, it is necessary to develop an algorithm that effectively performs index coding in a multicasting transmission environment and to retransmit the data with this algorithm so as to be suitable for the ARQ scheme for packet retransmission in the LTE communication.

SUMMARY OF THE INVENTION The present invention, which is conceived in view of the above-described circumstances, provides a method of transmitting a plurality of packets by multicasting to a plurality of terminals in a base station, index-coding the packets not received upon retransmission of an unreceived packet due to a transmission error, The present invention provides a data retransmission method using index coding in a unicasting or multicasting transmission environment of a wireless communication network in which an index-coded packet is decoded to selectively receive packets not received by each terminal.

The technical objects of the present invention are not limited to the technical matters mentioned above, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method of retransmitting data using index coding of a wireless communication network in a wireless communication network, the method comprising: Unicasting or multicasting transmits a packet, and then checks whether an ACK signal or a NACK signal is received on a packet-by-packet basis. If a non-received packet is retransmitted, And the terminal decodes the index-coded packet and selectively receives a packet not received by each terminal.

When a plurality of packets to be index-coded by the base station are selected by the base station, a sequence of packet acknowledgments is sequentially performed for each of the terminals in order to check whether the packets are index- The UE to be retransmitted determines whether or not another packet should be retransmitted. If the UE is to retransmit a single packet, the packet is selected as a packet to be index-coded.

In the packet selection process for index coding, an index set corresponding to a list of target terminals to receive packets to be index-coded is generated for each packet, and a terminal to be retransmitted with reference to the index set It is determined whether another packet should be retransmitted.

When the UEs are not included in the index set for each packet in the index-coded packet selection process, the UE selects the corresponding packet as the index-coded packet.

When at least one of the reception target terminals of the non-received packet is included in the index set in the selection process of the packet to be index-coded, the selection process is terminated and the currently selected packets are index-coded and retransmitted to the terminals .

In the above process, even if at least one of the reception target terminals is included in the index set during the selection of the packet to be index-coded, the packet to be index-coded is selected through the selection process for all other packets, All the selected packets are index-coded and retransmitted to the UEs.

When a plurality of packets are index-coded and retransmitted by the base station, a packet index corresponding to a list of index-coded packets is generated and included in a packet header to be retransmitted.

The UE receives the index-coded packet by retransmission, decodes the received index-coded packet, and receives an unreceived packet from the corresponding receiving terminal. The index coding and decoding are performed by an exclusive-OR operation.

If m-1 packets among the m packets are successfully received and retained by the terminal with reference to the packet index included in the packet header retransmitted in the decoding, m-1 packets to be retransmitted And performs an exclusive-OR operation to receive a packet that the terminal has not received. If the terminal does not hold m-1 packets and there are at least two unacknowledged packets, the decoding process is stopped.

In decoding, the UE pre-stores previously received packets in the buffer of the UE in order to perform an exclusive-OR operation with previously received packets to receive an unreceived packet.

When storing the previously received packets in the buffer, the terminal stores only the packets in the window range of the base station controlling the corresponding terminal, and deletes the packets outside the window range to manage the buffer.

In this case, the base station shares the window information of the base station with the receiving terminal through the control signal so that the receiving terminal can confirm the window range set in the base station.

According to the data retransmission method using the index coding of the wireless communication network of the present invention, since packet retransmission necessary for all terminals can be minimized while minimizing the number of packets to be retransmitted by index coding, efficient radio resources can be used, .

Furthermore, since multiple packets can be retransmitted at the same time, retransmission reception time can be shortened, which can improve the packet transmission delay.

In addition, reliable multicasting is possible, which improves the quality of group calls. In addition, it is possible to efficiently support services that require packet retransmission, such as data sharing, while minimizing system resources. It is effective.

FIG. 1 is a conceptual diagram of an ARQ scheme for retransmission when a packet error occurs in a conventional mobile communication network.
2 is a conceptual diagram for explaining a process of index coding in a multicasting transmission environment.
3 is a detailed block diagram of a Node B and a UE for data retransmission according to an embodiment of the present invention.
4 is a flowchart illustrating a process of selecting a packet for index coding in a data retransmission method using index coding of a wireless communication network according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a process of selecting a packet to be index-encoded in a data retransmission method using index coding of a wireless communication network according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

Hereinafter, a data retransmission method using index coding of a wireless communication network according to a preferred embodiment of the present invention will be described in detail.

2 is a conceptual diagram for explaining a process of index coding in a multicasting transmission environment.

2, when the first and second terminals 301 and 302 have previously received the first packet 201 and the second packet 202, respectively, the base station 100 transmits the first packet 201 The first packet 201 decodes the index-coded packet 203 and the first packet 201 (XOR) by index-coded (XOR-processed) The second terminal 302 receives the second packet 202 and decodes the received index coded packet 203 and the second packet 202 to receive the first packet 201 have.

In this manner, the base station 100 index-codes the packet 200 and transmits the packet 200 as one index-coded packet 203, thereby reducing the number of transmissions compared to transmitting the first and second packets 201 and 202 separately, It is possible to selectively decode the packets 200 that are not received, thereby enabling efficient packet transmission to each of the reception subject terminals 300. [

3 is a detailed block diagram of a Node B and a UE for data retransmission according to an embodiment of the present invention.

3, the base station 100 for data retransmission according to an exemplary embodiment of the present invention includes a reception index set management unit 110, a window setting unit 120, a wireless communication unit 130, (140). ≪ / RTI >

The reception index set management unit 110 stores the packets 200 to be index-coded calculated based on the ACK or NACK signal in the packet selection process to be index-coded in the base station 100 The generated index set is stored, and it is possible to confirm whether each of the k < th > terminals 300 corresponds to the receiving terminal 300 with respect to a specific packet i.

When a packet 200 to be index-coded is selected by the base station 100 transmitting the packet 200 with reference to the index set, the set of the retransmission target terminals 300 for the packet i is denoted by RTX (i) RTX (j) = Φ (empty) condition for any i-th packet and j-th packet, if the set of RTX (j) . This conditional expression means that a packet 200 not received by each terminal 300 should be a single packet 200. [

The window setting unit 120 can set the window range of the packet 200 to be continuously transmitted to the data reception target terminals 300 managed by each base station 100. [ The base station 100 transmits the window information set in the base station 100 to the receiving terminal 300 through the control signal so that the window size (range) set in the base station 100 can be confirmed by the packet reception object terminal 300 of the base station 100, (300).

The wireless communication unit 130 is configured to establish a wireless communication environment for unicasting or multicasting transmission and transmit a plurality of packets 200 to the terminal 300.

The packet index generation unit 140 generates a packet index corresponding to the list of the index-coded packets 203 when retransmitting a plurality of packets 200 in the base station 100 and transmits the packet index 200a ).

Each terminal 300 may include a buffer 310, a buffer management unit 320, a packet index management unit 330, and a window verification unit 340.

The buffer 310 may store the packet 200 that has been successfully transmitted and received by the base station 100.

The buffer management unit 320 stores only the packets 200 in the window range of the base station 100 that is in charge of the corresponding terminal 300 in the buffer 310 and deletes the packets 200 out of the window range, Lt; RTI ID = 0.0 > 310 < / RTI >

The packet index management unit 330 stores the packet index included in the packet header 200a in the base station 100 so that the terminal 300 can refer to the packet index when decoding the packet 200. [

The window confirmation unit 340 can receive the window information set in the base station 100 through the control signal of the base station 100 and confirm the window range.

4 is a flowchart illustrating a method of selecting a packet to be index-coded in a data retransmission method using index coding of a wireless communication network according to an exemplary embodiment of the present invention.

The data retransmission method using the index coding of the present invention is basically performed in a unicasting or multicasting transmission environment between the base station 100 and the terminal 300 of the wireless communication network. The base station 100 transmits a plurality of packets 200 by unicasting or multicasting to the terminal 300 and then transmits the packets 200 not received from the terminal 300 according to whether an ACK signal or a NACK signal is received on a packet- And performs index coding corresponding to exclusive OR (XOR) operation on a plurality of packets 200 that have not been received when retransmitting an unreceived packet 200 of the terminal 300, 300).

In order to continuously transmit data at a window size used in the ARQ scheme, a two-dimensional vector having a (N, M) window size is assumed. Where N is the number of the reception subject terminals 300 and M is the number of ACK or NACK signals transmitted from the reception subject terminal 300 to the base station 100. [

In the process of selecting a packet to be index-coded, a U, which is a two-dimensional vector having a window size of (1, N) and all values of 1, can be defined as an initial value (S10). Here, U means the receiving terminal 300 of the current index-coded packets 200.

Thereafter, when a plurality of packets 200 to be index-coded by the base station 100 are selected, packets to be index-coded at the current time are transmitted to the reception subject terminal 300 of each packet 200 A packet acknowledgment sequence for sequentially checking the packet 200 can be performed. That is, i is set to the lowest packet acknowledgment sequence number in the window range (S12), and each time the entire loop of the algorithm shown in FIG. 4 is performed, the value is incremented by 1, And sequentially confirms the packet to be retransmitted to the terminal 300 for each sequence (S22).

In each loop, it is determined whether a negative acknowledgment signal (NACKi) for packet i is received every time the packet acknowledgment sequence is performed, and it is determined whether there is an unreceived packet 200 for each terminal 300 (S14). That is, | NACKi | > 0 means that at least one non-received packet i exists in the NACKi set, which means that the packet 200 requiring retransmission is present. Here, NACKi may be defined as a list or a set of terminals that have failed to receive packet i and requested retransmission to the base station 100, and may be configured based on an ACK signal or a NACK signal, which is feedback information of the terminal 300 .

If a negative acknowledgment signal (NACKi) is received from the base station 100 side, that is, | NACKi | > 0, it is determined whether or not all of the terminal 300 k satisfies U (k) = 1 with respect to the packet i. If the terminal 300 satisfies U (k) = 1, the terminal 300 is set as the receiving terminal 300 of the packet i, (K) = 0 (S16, S18, S20).

If U (k) = 0, the terminal 300 does not correspond to the reception subject terminal 300 of the packet i to be retransmitted at the current time (packet acknowledgment sequence time point) k corresponds to the reception subject terminal 300 of the packet i.

At this time, the base station 100 generates an index set corresponding to the list of the target terminals 300 to receive the current index-coded packets calculated based on the ACK signal or the NACK signal in the packet selection process to be index-coded, It is possible to check whether each k-th terminal 300 corresponds to the receiving terminal 300 with respect to the packet i.

If the destination terminal 300 is not included in the index set for each packet in the index-coded packet selection process, the packet 200 is selected as the packet 200 to be index-coded and transmitted to the terminal 300 after retransmission. It is preferable that the packet 200 not be duplicated when it is decoded.

If at least one of the reception target terminals 300 of the non-received packet 200 is included in the index set in the process of selecting the index-coded packet 200, the selection process is immediately terminated and only the currently selected packets are index- And retransmits it to the terminals 300 (S24). In the case of selecting the packet 200 as described above, the packet 200 not received for each terminal 300 can be immediately retransmitted after confirmation, so that all the packets 200 are not checked, Since the retransmission is immediately performed, there is an advantage that the time required for index coding and decoding is reduced. In this case, the retransmission is performed through the packet acknowledgment sequence after the retransmission of the non-received packet is performed for another packet. A communication delay may occur.

Furthermore, when the base station 100 index-codes and retransmits a plurality of packets 200, it is preferable to generate a packet index corresponding to a list of the packets subjected to the index coding processing and to include the packet index in the packet header 200a to be retransmitted Do.

On the other hand, when the terminal 300 retransmits the index-coded packet 200 from the base station 100, the terminal 200 decodes the packet 200 and selects and receives only the packet 200 that the terminal 300 does not receive.

That is, the decoding process is performed by performing an exclusive OR operation (XOR) on the index-coded packet 203 and the packets 200 already received by the corresponding terminal 300, so that only the unreceived packet 200 can be selectively provided.

Further, in the decoding process, when the terminal 300 successfully receives and holds m-1 packets 200 among the m packets 200 by referring to the packet index included in the retransmitted packet header 200a, m (M-1) out of the m packets 200. In the m-1 packet 200, the m-1 packet 200 is subjected to the exclusive-OR operation with the packet 200 to be retransmitted, It is desirable to stop the decoding process if it is determined that at least two unacknowledged packets exist because the packet 200 is not held.

The reason for stopping the decoding process is that the packet 300 that is not received at the time of decoding at the terminal 300 can be selectively provided with a single number of packets 200 that have not yet been received. If at least two packets are not received in the terminal 300, even if decoding is performed, the XOR-processed packet is not decoded properly, and thus each received packet can not be received. In this case, the terminal 300 requests the base station 100 to transmit a plurality of non-received packets separately without performing index coding.

In order to perform an exclusive-OR operation with previously received packets in order to receive the packets 200 that were not received during decoding, each of the terminals 300 stores previously received packets in a buffer provided in the terminal 300 .

Each of the terminals 300 stores only the packets in the window range of the base station 100 that is in charge of the corresponding terminal 300 in the buffer when storing the previously received packets in the buffer, 200) can be deleted to manage the buffer.

Further, the base station 100 may receive window information set in the base station 100 through the control signal so that the packet reception object terminal 300 of the base station 100 can confirm the window size (range) set in the base station 100 It can be shared with the terminal 300.

5 is a flowchart illustrating a process of selecting a packet to be index-encoded in a data retransmission method using index coding of a wireless communication network according to another embodiment of the present invention.

The steps S50, S52, S54, S58, S60, and S62 of FIG. 4 may be performed at steps S10, S12, S14, S18, S20, and S22 of FIG. 4 in the packet selection process of index coding of the data retransmission method using index coding according to another embodiment of the present invention. Even if at least one of the reception subject terminals 300 of the non-received packet 200 is included in the index set in the selection process of the packet 200 to be index-coded in the step S56, The selection process is performed for all the packets 200 without ending the process.

That is, even if at least one of the reception target terminals 300 is included in the index set in the process of selecting the index-coded packet 200, the selection process is performed not only for the specific packet i but also for all other packets. Selects the packet 200 to be index-coded while index-coding all the packets 200 finally selected, and retransmits the index-coded packet 203 to the terminals 300.

Since the index coding is performed after the acknowledgment sequence is performed on all the packets, the coding and decoding operation complexity can be increased, but the communication delay can be reduced as compared with the algorithm according to the embodiment of FIG.

100; A base station 110; Reception index set management section
120; A window setting unit 130; Wireless communication section
140; The packet index generating unit
200; Packet 200a; Packet header
201; A first packet 202; The second packet
203; An index coded packet 300; Terminal
301; A first terminal 302; The second terminal
310; Buffer 320; Buffer manager
330; A packet index management unit 340; Window confirmation unit

Claims (12)

In a unicasting or multicasting transmission environment in which a base station of a wireless communication network transmits data to a plurality of terminals, the base station unicasts or multicasts a plurality of packets to the terminal, and then receives an ACK signal or a NACK signal for each packet Received packets from the terminal and retransmits the packets not received by the terminal by index coding and transmitting a plurality of packets that have not been received, and the terminal decodes the index-coded packets, Selectively receive one packet,
When selecting a plurality of packets to be index-coded by the base station, a sequence of packet acknowledgments is sequentially performed on a packet-by-packet basis to check whether each of the terminals corresponds to a terminal to receive current index-coded packets, It is determined whether or not the other packet should be retransmitted. If the packet is to be retransmitted for a single packet, the packet is selected as a packet to be index-coded,
In the packet selection process to be index-coded, an index set corresponding to a list of target terminals to receive packets to be currently index-coded is generated for each packet, and a terminal to be retransmitted by referring to the index set retransmits other packets Judge whether or not it should be received,
And selecting index-coded packets as the packets if the terminals are not included in the index set for each packet in the index-coded packet selection process. delete delete delete The method according to claim 1,
Wherein when at least one of the reception target terminals of the non-received packets is included in the index set in the selection process of the packet to be index-coded, the selection process is terminated and the currently selected packets are index-coded and retransmitted to the terminals Data Retransmission Method Using Index Coding. The method according to claim 1,
Even if at least one of the reception target terminals is included in the index set in the selection process of the packet to be index-coded, the packet to be index-coded is selected through all the other packets during the selection process, Index coding and retransmitting the data to the UEs using index coding of a wireless communication network. The method according to claim 1,
And generating a packet index corresponding to a list of the packets subjected to the index coding processing when indexing and retransmitting a plurality of packets in the base station, the packet index is included in a packet header to be retransmitted. 8. The method of claim 7,
The method of claim 1, wherein the index coding and decoding are exclusive OR operations after receiving the index-coded packet by retransmission, decoding and receiving the packet that the receiving terminal has not received, and the index coding and decoding are exclusive OR operation. 8. The method of claim 7,
And when m-1 packets out of m packets are successfully received and retained by the terminal with reference to the packet index included in the packet header retransmitted at the time of decoding, a packet to be retransmitted with m-1 retained packets is subjected to an XOR operation Receiving a packet not received by the terminal, and stopping the decoding process if the terminal does not hold m-1 packets and there are at least two unacknowledged packets. A method of retransmitting data used. 10. The method of claim 9,
The UE pre-stores previously received packets in the buffer of the UE in order to perform an exclusive-OR operation with previously received packets in order to receive an unreceived packet at the time of decoding, using the index coding of the wireless communication network Data retransmission method. 11. The method of claim 10,
When the terminal stores previously successfully received packets in the buffer, stores only packets in a window range of a base station that manages the terminal, buffers packets by deleting packets outside the window range, Data Retransmission Method Using Index Coding. 12. The method of claim 11,
Wherein the base station shares the window information of the base station with the receiving terminal through the control signal so that the receiving terminal can confirm the window range set in the base station by using the index coding of the wireless communication network.
KR1020150058856A 2015-04-27 2015-04-27 Method for retransimitting received data of using index coding in wireless communication KR101766525B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100692354B1 (en) 1998-10-28 2007-03-09 텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘) Method and apparatus for discarding packets in a data network having automatic repeat request

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100692354B1 (en) 1998-10-28 2007-03-09 텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘) Method and apparatus for discarding packets in a data network having automatic repeat request

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Shen Yong 외 1인, "XOR Retransmission in Multicast Error Recovery", Proceedings of IEEE International Conference on Networks(ICON 2000), pp.336-340, 2000.09.08.*

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