METHOD AND APPARATUS FOR TRANSMITTING DATA PACKETS AND METHOD AND APPARATUS FOR RECEIVING DATA PACKETS

• US 20120087309A1
• Filed: 12/16/2011
• Published: 04/12/2012
• Est. Priority Date: 09/20/2005
• Status: Active Grant

• Current Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: CHARPENTIER, Frederic, LOHR, Joachim
• Granted Patent: US 8,494,003 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 1/1841 Resequencing
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/30 in combination with information about buffer occupancy at either end or at transit nodes
• CPC Class Codes: H04L 47/43 Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 69/02 Protocol performance
• CPC Class Codes: H04L 69/03 Protocol definition or specification protocol conformance testing H04L1/244
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/166 IP fragmentation; TCP segmentation
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 69/321 Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets

Abstract

The invention relates to a data packet structure for conveying data of service data units (SDU) using protocol data units (PDU). The data packet comprise a data packet payload comprising at least one protocol data unit (PDU), wherein a protocol data unit (PDU) comprises a service data unit (SDU) or a fragment of a service data unit; and a data packet header comprising an indicator (FFF,SFF) indicating whether or not the data packet payload begins with a protocol data unit (PDU) being a fragment of a service data unit and whether or not the data packet payload ends with a protocol data unit (PDU) being a fragment of a service data unit.

Claims

1. A method for transmitting data packets, the method comprising the steps of:

mapping one of (i) a plurality of full service data units, (ii) a plurality of segments of service data units, or (iii) at least one full service data unit and at least one segment of a service data unit to a data packet payload, the service data units in each of options (i), (ii) or (iii) including a first service data unit and a last service data unit;

mapping a single indicator consisting of a first bit and a second bit to a data packet header, when the number of the service data units in the data packet payload is more than two;

mapping the data packet header and the data packet payload to a data packet; and

transmitting the data packet by a transmitter, wherein;

the first bit and the second bit of the indicator indicate only (i) whether or not the data packet payload begins with a segment of the first service data unit, and (ii) whether or not the data packet payload ends with a segment of the last service data unit.

2. The method according to claim 1, wherein the indicator is included only in the data packet header.

3. The method according to claim 1, wherein, the data packet payload comprises one of said plurality of segments of service data units, or said at least one full service data unit and at least one segment of a service data unit, and the indicator indicates whether or not the data packet payload is to be reassembled with the data packet payload of a previously sent data packet and whether or not the data packet payload is to be reassembled with the data packet payload of a next data packet.

4. An apparatus for transmitting data packets, the apparatus comprising:

a data packet payload mapping section that maps one of (i) a plurality of full service data units, (ii) a plurality of segments of service data units, or (iii) at least one full service data unit and at least one segment of a service data unit to a data packet payload, the service data units in each of options (i), (ii) or (iii) including a first service data unit and a last service data unit;

a data packet header mapping section that maps a single indicator consisting of a first bit and a second bit to a data packet header, when the number of the service data units in the data packet payload is more than two;

a data packet mapping section that maps the data packet header and the data packet payload to a data packet; and

a transmitter that transmits the data packet, wherein;

the first bit and the second bit of the indicator indicate only (i) whether or not the data packet payload begins with a segment of the first service data unit, and (ii) whether or not the data packet payload ends with a segment of the last service data unit.

5. The apparatus according to claim 4, wherein, the data packet payload comprises one of said plurality of segments of service data units, or said at least one full service data unit and at least one segment of a service data unit, and the indicator indicates whether or not the data packet payload is to be reassembled with the data packet payload of a previously sent data packet and whether or not the data packet payload is to be reassembled with the data packet payload of a next data packet.

6. The apparatus according to claim 4, wherein the apparatus is a wireless terminal in a communication system.

7. The apparatus according to claim 4, wherein the apparatus is a wireless base station in a communication system.

8. A method for receiving data packets comprising a data packet header and a data packet payload, the method comprising the steps of:

receiving data packets by a receiver, each data packet comprising;

a data packet payload comprising one of (i) a plurality of full service data units, (ii) a plurality of segments of service data units, or (iii) at least one full service data unit and at least one segment of a service data unit, the service data units in each of options (i), (ii) or (iii) including a first service data unit and a last service data unit; and

a data packet header comprising a single indicator consisting of a first bit and a second bit when the number of the service data units in the data packet payload is more than two, wherein the first bit and the second bit of the indicator indicate only (i) whether or not the data packet payload begins with a segment of the first service data unit, and (ii) whether or not the data packet payload ends with a segment of the last service data unit.

9. The method according to claim 8, wherein the method further comprises, buffering the (i) plurality of full service data units, (ii) plurality of segments of service data units, or (iii) at least one full service data unit and at least one segment of a service data unit of the received data packet payload with previously received at least one full or segment of a service data unit in a reception buffer.

10. An apparatus for receiving data packets comprising a data packet header and a data packet payload, the apparatus comprising:

a receiver that receives data packets, each data packet comprising;

a data packet payload comprising one of (i) a plurality of full service data units, (ii) a plurality of segments of service data units, or (iii) at least one full service data unit and at least one segment of a service data unit, the service data units in each of options (i), (ii) or (iii) including a first service data unit and a last service data unit;

the number of the service data units in the data packet payload is more than two, wherein the first bit and the second bit of the indicator indicate only (i) whether or not the data packet payload begins with a segment of the first service data unit, and (ii) whether or not the data packet payload ends with a segment of the last service data unit.

11. The apparatus according to claim 10, wherein the apparatus further comprises a reception buffer that buffers the (i) plurality of full service data units, (ii) plurality of segments of service data units, or (iii) at least one full service data unit and at least one segment of a service data unit of the received data packet payload with previously received at least one full or segment of a service data unit.

12. The apparatus according to claim 10, the apparatus is a wireless terminal in a communication system.

13. The apparatus according to claim 10, the apparatus is a wireless base station in a communication system.