Packet communication method and proposal node
First Claim
1. Method of packet communication in network at least partially including radio communication area, said method comprising, after packet loss occurred due to interruption of communication between proposal node to make radio communication using TCP and general node placed on said network and functioning as device being able to make standard TCP communication, the method comprising the steps of:
- detecting communication recovery by said proposal node;
informing of detected communication recovery from said proposal node to said general node; and
starting data retransmission by said general node upon being informed of communication recovery,wherein said proposal node transmits D times pseudo duplicated acknowledgements, said D being calculated by
D=ceil(awnd/MSS)where awnd represents advertised receive window size of said proposal node after expanded on recovery state and MSS represents the maximum segment size.
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Accused Products
Abstract
Upon recovery of communication, this recovery is detected by communication recover detector and then optimal times duplicated pseudo acknowledgements calculated by arithmetic unit are transmitted from ACK transmitter. During normal state, advertisement is made in small value of advertised receive window size and immediately after recovery state, advertisement is made in expanded window size.
27 Citations
15 Claims
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1. Method of packet communication in network at least partially including radio communication area, said method comprising, after packet loss occurred due to interruption of communication between proposal node to make radio communication using TCP and general node placed on said network and functioning as device being able to make standard TCP communication, the method comprising the steps of:
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detecting communication recovery by said proposal node; informing of detected communication recovery from said proposal node to said general node; and starting data retransmission by said general node upon being informed of communication recovery, wherein said proposal node transmits D times pseudo duplicated acknowledgements, said D being calculated by
D=ceil(awnd/MSS)where awnd represents advertised receive window size of said proposal node after expanded on recovery state and MSS represents the maximum segment size. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Proposal node to make radio communication using TCP, comprising:
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means to detect the end of communication interruption, to confirm that received signal power has exceeded a predetermined threshold level and thereby to detect communication recovery; means to transmit pseudo duplicated acknowledgment; and means for adjusting the advertised receive window size of the proposal node to transmit advertisement to said general node, wherein said proposal node transmits D times pseudo duplicated acknowledgements, said D being calculated by
D=ceil(awnd/MSS)where awnd represents advertised receive window size of said proposal node after expanded on recovery state and MSS represents the maximum segment size. - View Dependent Claims (10, 11, 12)
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13. Method of packet communication in network at least partially including radio communication area, said method comprising, after packet loss occurred due to interruption of communication between proposal node to make radio communication using TCP and general node placed on said network and functioning as device being able to make standard TCP communication, the method comprising the steps of:
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detecting communication recovery by said proposal node; informing of detected communication recovery from said proposal node to said general node; and starting data retransmission by said general node upon being informed of communication recovery, wherein for advertisement in small value of advertised receive window size during normal state, said proposal node calculates awnd′
s satisfying both of following inequality and equation;
2>
awnd/MSS+(6−
n(n+1)/2)
and
n=(awnd−
awnd′
)/MSSwhere awnd represents advertised receive window size of said proposal node after expanded on recovery state, awnd′
represents small value of advertised receive window size on normal state and MSS represents the maximum segment size. - View Dependent Claims (14)
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15. Proposal node to make radio communication using TCP, comprising:
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means to detect the end of communication interruption, to confirm that received signal power has exceeded a predetermined threshold level and thereby to detect communication recovery; means to transmit pseudo duplicated acknowledgment; and means for adjusting the advertised receive window size of the proposal node to transmit advertisement to said general node wherein for advertisement in small value of advertised receive window size during normal state, said proposal node calculates awnd′
s satisfying both of following inequality and equation;
2>
awnd/MSS+(6−
n(n+1)/2) and n=(awnd−
awnd′
)/MSS where awnd represents advertised receive window size of said proposal node after expanded on recovery state, awnd′
represents small value of advertised receive window size on normal state and MSS represents the maximum segment size and advertises the maximum value of these awnd′
s obtained in this manner.
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Specification