# US 9,521,582 B2 · Method and apparatus for transmitting and receiving packet data unit in mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,582 B2 - Document ID: US9521582B2 - Status: Granted - Kind: B2 - Application number: 14/528,412 - Filed: 2014-10-30 - Published: 2015-02-19 - Granted: 2016-12-13 - Earliest claimed: 2007-04-11 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Jun-Sung Lee; Hye-Jeong Kim; Do-Young Lee; Young-Taek Kim - Web page: https://patentgrep.com/patent/US9521582B2 ## CPC - H04W 28/065: {using assembly or disassembly of packets} - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04L 1/0079: {Formats for control data (H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 80/02: Data link layer protocols - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods and apparatuses are provided for transmitting and receiving a Packet Data Unit (PDU) in a mobile communication system. The PDU, including a header and at least one data field, is generated. The PDU is transmitted. The header includes a length indicator (LI) field and an extension bit field. The LI field indicates a length of a corresponding data field. The extension bit field indicates whether a data field follows or a set of an extension bit field and an LI field follows. The extension bit field is placed prior to the LI field in the set of the extension bit field and the LI field. An LI field is present for every data field except a last data field. ## Claims ### Claim 1 A method for transmitting a packet data unit (PDU) by a transmission apparatus including a controller and a transmitter in a mobile communication system, the method comprising: obtaining, by the controller, a header including a length indicator (LI) field and an extension bit field, wherein the LI field indicates a length of a corresponding data field and the extension bit field indicates whether a data field follows or a set of an extension bit field and an LI field follows; generating, by the controller, the PDU including the header and at least one data field; and transmitting, by the transmitter, the PDU, wherein the extension bit field is placed prior to the LI field in the set of the extension bit field and the LI field, and wherein an LI field is present for every data field except a last data field. ### Claim 2 (depends on 1) The method of claim 1, wherein the PDU further comprises a data/control (D/C) field that indicates whether the PDU is a data PDU or a control PDU, a sequence number field that indicates a sequence of the PDU, and a polling (P) field that indicates polling. ### Claim 3 (depends on 2) The method of claim 2, wherein the D/C field, the sequence number field, and the P field are placed prior to the set of the extension bit field and the LI field. ### Claim 4 (depends on 2) The method of claim 2, wherein the PDU further comprises a header extension (HE) field that indicates whether a data field follows in the header or the set of the extension bit field and the LI field follows in the header. ### Claim 5 (depends on 2) The method of claim 2, wherein the header is byte aligned. ### Claim 6 (depends on 4) The method of claim 4, wherein a set of the D/C field, the sequence number field, the P field, and the HE field is byte aligned. ### Claim 7 (depends on 1) The method of claim 1, wherein, if a value of the extension bit field is 0, the data field follows, and if the value of the extension bit field is 1, the set of the extension bit field and the LI field follows. ### Claim 8 An apparatus for transmitting a packet data unit (PDU) in a mobile communication system, the apparatus comprising: a controller configured to obtain a header including a length indicator (LI) field and an extension bit field that indicates whether a data field follows or a second set of an extension bit field and an LI field follows, wherein the LI field indicates a length of a corresponding data field and the extension bit field indicates whether a data field follows or a set of an extension bit field and an LI field follows, and generate the PDU including the header and at least one data field; and a transmitter configured to transmit the PDU, wherein the extension bit field is placed prior to the LI field in the set of the extension bit field and the LI field, and wherein an LI field is present for every data field except a last data field. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the PDU further comprises a data/control (D/C) field that indicates whether the PDU is a data PDU or a control PDU, a sequence number field that indicates a sequence of the PDU, and a polling (P) field that indicates polling. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the D/C field, the sequence number field, and the P field are placed prior to the set of the extension bit field and the LI field. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the PDU further comprises a header extension (HE) field that indicates whether a data field follows in the header or the set of the extension bit field and the LI field follows in the header. ### Claim 12 (depends on 9) The apparatus of claim 9, wherein the header is byte aligned. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein a set of the D/C field, the sequence number field, the P field, and the HE field is byte aligned. ### Claim 14 (depends on 8) The apparatus of claim 8, wherein, if a value of the extension bit field is 0, the data field follows, and if the value of the extension bit field is 1, the set of the extension bit field and the LI field follows. ### Claim 15 A method for receiving a packet data unit (PDU) by a reception apparatus including a controller and a receiver in a mobile communication system, the method comprising: receiving by the receiver, the PDU including a header and at least one data field, wherein the header includes a length indicator (LI) field and an extension bit field, the LI field indicating a length of a corresponding data field and the extension bit field indicating whether a data field follows or a set of an extension bit field and an LI field follows; obtaining, by the controller, the header including the LI field and the extension bit field in the PDU; and processing, by the controller, the at least one data field in the PDU, based the obtained header including the LI field and the extension bit field, wherein the extension bit field is placed prior to the LI field in the set of the extension bit field and the LI field, and wherein an LI field is present for every data field except a last data field. ### Claim 16 (depends on 15) The method of claim 15, wherein the PDU further comprises a data/control (D/C) field that indicates whether the PDU is a data PDU or a control PDU, a sequence number field that indicates a sequence of the PDU, and a polling (P) field that indicates polling. ### Claim 17 (depends on 16) The method of claim 16, wherein the D/C field, the sequence number field, and the P field are placed prior to the set of the extension bit field and the LI field. ### Claim 18 (depends on 16) The method of claim 16, wherein the PDU further comprises a header extension (HE) field that indicates whether a data field follows in the header or the set of the extension bit field and the LI field follows in the header. ### Claim 19 (depends on 16) The method of claim 16, wherein the header is byte aligned. ### Claim 20 (depends on 18) The method of claim 18, wherein a set of the D/C field, the sequence number field, the P field, and the HE field is byte aligned. ### Claim 21 (depends on 15) The method of claim 15, wherein, if a value of the extension bit field is 0, the data field follows, and if the value of the extension bit field is 1, the set of the extension bit field and the LI field follows. ### Claim 22 An apparatus for receiving a packet data unit (PDU) in a mobile communication system, the method comprising: a receiver configured to receive the PDU including a header and at least one data field, wherein the header includes a length indicator (LI) field and an extension bit field, the LI field indicating a length of a corresponding data field and the extension bit field indicating whether a data field follows or a set of an extension bit field and a LI field follows; and a controller configured to obtain the header including the LI field and the extension bit field in the PDU, and process the at least one data field in the PDU, based the obtained header including the LI field and the extension bit field, wherein the extension bit field is placed prior to the LI field in the set of the extension bit field and the LI field, and wherein an LI field is present for every data field except a last data field. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the PDU further comprises a data/control (D/C) field that indicates whether the PDU is a data PDU or a control PDU, a sequence number field that indicates a sequence of the PDU, and a polling (P) field that indicates polling. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the D/C field, the sequence number field, and the P field are placed prior to the set of the extension bit field and the LI field. ### Claim 25 (depends on 23) The apparatus of claim 23, wherein the PDU further comprises a header extension (HE) field that indicates whether a data field follows in the header or the set of the extension bit field and the LI field follows in the header. ### Claim 26 (depends on 23) The apparatus of claim 23, wherein the header is byte aligned. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein a set of the D/C field, the sequence number field, the P field, and the HE field is byte aligned. ### Claim 28 (depends on 22) The apparatus of claim 22, wherein, if a value of the extension bit field is 0, the data field follows, and if the value of the extension bit field is 1, the set of the extension bit field and the LI field follows.