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Patent US6385199B2 successfully refreshed from Google Patents.
US6385199B2
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Method and apparatus for packet transmission with header compression
Assignee: NTT Docomo Inc
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Filing: 2001-02-26
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Granted: 2002-05-07
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Expires: 2021-02-26
Abstract
Abstract A sender converts a non-compressed packet, which is to be transmitted, into a full-header packet including a full header or a header-compressed packet including a compressed header, and sends the converted packet to a receiver. The receiver receives the packet transmitted from the sender, and converts the received packet into a decompressed packet. In cases the full-header packet or header-compressed packet is lost between the sender and receiver, the receiver keeps header-compressed packers received during an interval from the packet loss to the next earliest reception of a full-header packet, and decompresses the compressed headers of the kept header-compressed packets on the basis of contents of the full header of the full-header packet.
Inventors
- 👤 Takeshi Yoshimura
- 👤 Toshiro Kawahara
- 👤 Takashi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:23
CPC Classifications
H; H04; H04L; H04L69/00; H04L69/04; H04L47/00; H04L47/10; H04L47/38; H04L69/16; H04L69/161; H04L69/22; H04L9/00; H04L9/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
194 words
A packet transmitting method comprising the steps of: a packet transmission by a communication apparatus provided on a transmission node in a network, the packet transmission including an operation for converting a plurality of non-compressed packets to be transmitted into either a full-header packet with a full header or a header-compressed packet with a compressed header and transmitting a converted packet to a receiver node in the network; and a packet reception by a communication apparatus provided on the receiver node, the packet reception including an operation for receiving the full-header packet or the header-compressed packet transmitted from the sender and an conversion for converting a received packet to a decompression packet, the conversion including: an operation for keeping, in cases a full-header packet or header-compressed packet is lost during transmission from the sender node to the receiver node, at least one header-compressed packets received during an interval between an occurrence of a packet loss and a reception of a next full-header packet, and an operation for decompressing a compressed header of the header-compressed packets thus kept, based on a content of a full header of the full-header packet received after the packet loss.
Claim 2
Dependent Claim
194 words
A packet transmitting method comprising the steps of: a packet transmission by a communication apparatus provided on a transmission node in a network, the packet transmission including an operation for converting a plurality of non-compressed packets to be transmitted into either a full-header packet with a full header or a header-compressed packet with a compressed header and transmitting a converted packet to a receiver node in the network; and a packet reception by a communication apparatus provided on the receiver node, the packet reception including an operation for receiving the full-header packet or the header-compressed packet transmitted from the sender and an conversion for converting a received packet to a decompression packet, the conversion including: an operation for keeping, in cases a full-header packet or header-compressed packet is lost during transmission from the sender node to the receiver node, at least one header-compressed packets received during an interval between an occurrence of a packet loss and a reception of a next full-header packet, and an operation for decompressing a compressed header of the header-compressed packets thus kept, based on a content of a full header of the full-header packet received after the packet loss.
Claim 3
Dependent Claim
70 words
A packet transmitting method of claim 1 , the operation for decompressing in the packet reception further including an operation for decompressing delta information in the kept header-compressed packets by reducing a difference value from the delta information included in the full header of the full-header packet received after the packet loss, the delta information being information which changes by the difference value between each of the non-compressed packets, respectively.
Claim 4
Dependent Claim
120 words
A packet transmitting method of claim 1 , the packet transmission further including an operation for adding, to at least part of the full headers of a full-header packet converted from the non-compressed packet, a difference value of delta information between the non-compressed packet and another non-compressed packet, the delta information being information which changes by the difference value between each of the non-compressed packets, respectively, and the operation for decompressing in the packet reception further including an operation for decompressing, when receiving a full-header packet with a difference value after the packet loss, the delta information in the kept header-compressed packet, by using the difference value and delta information included in a full header of the received full-header packet.
Claim 5
Dependent Claim
67 words
A packet transmitting method of claim 3 , wherein, in cases that a full-header packet corresponding to a non-compressed packet is transmitted and a delta information between the non-compressed packet and a non-compressed packet immediately before the non-compressed packet is different in a difference value from delta information of other non-compressed packet, the communication apparatus on the sender node adds a difference value to the full-header packet.
Claim 6
Dependent Claim
63 words
A packet transmitting method of claim 1 , the packet reception further comprising an operation for decompressing static information of the kept header-compressed packets based on static information included in a full header of a full-header packet received immediately before or after said packet loss, the static information being information contained in non-compressed headers of non-compressed packets and identical between the non-compressed packets.
Claim 7
Dependent Claim
107 words
A packet transmitting method of claim 1 , wherein each non-compressed header of the non-compressed packets includes delta information which changes by a difference value between the non-compressed packets, while a compressed header of at least part of the header-compressed packets includes partial bits which is a part of bits representing the delta information of the non-compressed header, and the packet reception further comprises an operation for decompressing delta information of the kept header-compressed packets by replacing part of bits representing delta information included in a full header of a full-header packet received after the packet loss, with partial bits included in a header-compressed packet previously obtained.
Claim 8
Dependent Claim
130 words
An relaying device intervening in a plurality of data terminals and relaying packets exchanged among the data terminals, comprising: reception means for receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping means for keeping, in cases the full-header packet or the header-compressed packet is lost before being received by the reception means, header-compressed packets received during an interval between a loss of the packet to a reception of a next full-header packet after the loss; and decompression means for decompressing a compressed header of each of the header-compressed packets kept by the keeping means, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 9
Dependent Claim
130 words
An relaying device intervening in a plurality of data terminals and relaying packets exchanged among the data terminals, comprising: reception means for receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping means for keeping, in cases the full-header packet or the header-compressed packet is lost before being received by the reception means, header-compressed packets received during an interval between a loss of the packet to a reception of a next full-header packet after the loss; and decompression means for decompressing a compressed header of each of the header-compressed packets kept by the keeping means, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 10
Dependent Claim
125 words
A data terminal capable of exchanging packets via a network with other data terminal, comprising: reception means for receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping means for keeping, in cases the full-header packet or header-compressed packet is lost before being received by the reception means, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompression means for decompressing a compressed header of each of the header-compressed packets kept by the keeping means, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 11
Dependent Claim
125 words
A data terminal capable of exchanging packets via a network with other data terminal, comprising: reception means for receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping means for keeping, in cases the full-header packet or header-compressed packet is lost before being received by the reception means, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompression means for decompressing a compressed header of each of the header-compressed packets kept by the keeping means, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 12
Dependent Claim
101 words
A packet reception method comprising the steps of: receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping, in cases the full-header packet or header-compressed packet is lost before being received, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompressing a compressed header of each of the header-compressed packets kept, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 13
Dependent Claim
101 words
A packet reception method comprising the steps of: receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping, in cases the full-header packet or header-compressed packet is lost before being received, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompressing a compressed header of each of the header-compressed packets kept, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 14
Dependent Claim
108 words
A program for making a computer executing a packet reception method comprising the steps of: receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping, in cases the full-header packet or header-compressed packet is lost before being received, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompressing a compressed header of each of the header-compressed packets kept, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 15
Dependent Claim
108 words
A program for making a computer executing a packet reception method comprising the steps of: receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping, in cases the full-header packet or header-compressed packet is lost before being received, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompressing a compressed header of each of the header-compressed packets kept, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 16
Dependent Claim
114 words
A computer readable storage media storing a program for making a computer executing a packet reception method comprising the steps of: receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping, in cases the full-header packet or header-compressed packet is lost before being received, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompressing a compressed header of each of the header-compressed packets kept, based on a content of a compressed header of a full-header packet received after the loss of the packet.
Claim 17
Dependent Claim
114 words
A computer readable storage media storing a program for making a computer executing a packet reception method comprising the steps of: receiving a full-header packet with a full header or a header-compressed packet with a compressed header and converting a received packet into a decompressed packet; keeping, in cases the full-header packet or header-compressed packet is lost before being received, header-compressed packets received during an interval between the loss of the packet and a reception of a next full-header packet after the loss; and decompressing a compressed header of each of the header-compressed packets kept, based on a content of a compressed header of a full-header packet received after the loss of the packet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-05-06 | 2005-11-05 | 2006-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-05-06 | 2009-11-05 | 2010-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-05-06 | 2013-11-05 | 2014-05-07 | $7700.00 | Window Closed / Lapsed |