Apple Inc. v. Samsung Electronics Co. Ltd. et al

Filing 662

EXHIBITS re 660 Administrative Motion to File Under Seal Apple Inc.'s Notice of Motion and Motion for Partial Summary Judgment Exhibits to Mueller Declaration ISO Apple's Motion for Partial Summary Judgment [660-9] filed byApple Inc.(a California corporation). (Attachments: # 1 Exhibit Mueller Decl Exhibit 26, # 2 Exhibit Mueller Decl Exhibit 27, # 3 Exhibit Mueller Decl Exhibit 28, # 4 Exhibit Mueller Decl Exhibit 29, # 5 Exhibit Mueller Decl Exhibit 30, # 6 Exhibit Mueller Decl Exhibit 31, # 7 Exhibit Mueller Decl Exhibit 32, # 8 Exhibit Mueller Decl Exhibit 33, # 9 Exhibit Mueller Decl Exhibit 34, # 10 Exhibit Mueller Decl Exhibit 35, # 11 Exhibit Mueller Decl Exhibit 36, # 12 Exhibit Mueller Decl Exhibit 37, # 13 Exhibit Mueller Decl Exhibit 38, # 14 Exhibit Mueller Decl Exhibit 39, # 15 Exhibit Mueller Decl Exhibit 40, # 16 Exhibit Mueller Decl Exhibit 41)(Related document(s) 660 ) (Selwyn, Mark) (Filed on 1/25/2012)

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Mueller Exhibit 25 US007675941B2 (12) United States Patent (lO) Patent No.: US 7,675,941 B2 (45) Date of Patent: Mar. 9, 2010 Kim et al. (54) (75) METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING PACKET DATA USING PRE-DEFINED LENGTH INDICATOR IN A MOBILE COMMUNICATION SYSTEM 2002/0041567 A1 2002/0048281 A1 2002/0174276 A1 * 2004/0160937 A1 * 2006/0072494 A1 * Inventors: Soeng-Hun Kim, Suwon-si (KR); (73) Assignee: Samsung Electronics Co., Ltd., Suwon-Si (KR) (*) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 908 days. (21) Appl. No.: 11/417,219 Filed: (65) May 4, 2006 (KR) ...................... 10-2005-0037774 (51) Int. Cl. ¯ I04J 3/DO (2006.01 ) (52) U.S. CI ......................... 3701473; 370/474; 370/329 (58) Field of Classification Search ................. 370/281, 370/295,344, 252, 349, 470, 474, 469 See application file for complete search history. (56) References Cited U.S. PATENT DOCUMENTS 2002/0001314 A1 * 2002/0024972 A1 1/2002 Yi et al ....................... 2/2002 Yi et al. 1 276 282 A 2204215 WO 00/21253 WO021253 1/2003 5/2003 4/2000 4/2000 OTHER PUBLICATIONS "Universal Mobile Telecommunications System (UMTS); Radio Link Control (RLC) protocol specification (3GPP TS 25.322 version 6.3.0 Release 6); ETSI TS 125 322" ETSI Standards, European Telecommunications Standards Institute, Sophia-Antipo, FR, vol. 3-R2, No. V630, Mar. 2005, XP014027660; ISSN: 0000-0001; sections 11.1.2.2 and 11.2.2.2. Primary Examine~Ricky Ngo Assistant Examiner David Oveissi (74) Attorney, Agent, or Firm Roylance, Abrams, Berdo & Goodman, LLP Foreign Application Priority Data May 4, 2005 EP RU WO WO * cited by examiner Prior Publication Data US 2007/0060139 A1 Mar. 15, 2007 (30) 710/105 370/349 370/328 FOREIGN PATENT DOCUMENTS Gert-Jan Van Lieshout, Middlesex (GB); Himke Van Der Velde, Middlesex (GB) (22) 4/2002 Yi et al. 4/2002 Yi et al. 11/2002 Jiang .......................... 8/2004 Jiang .......................... 4/2006 Matusz ....................... (57) ABSTRACT A method and apparatus for enabling efficient use of radio resources by reducing an RLC PDU size in a mobile communication system supporting voice service over a packet network are provided. An RLC layer constructs an RLC PDU without inserting information indicating the start and end of an SDU or indicating the use or non-use of padding. The RLC layer sets an LI in a header to indicate inclusion of an intermediate SDU segment in the data field of the RLC PDU. Therefore, the resulting decrease of overhead arising from packet transmission facilitates the efficient use of limited radio resources. 370/469 18 Claims, 9 Drawing Sheets 415 425 ---- DATA FIELD 430 --" APLNDC-WH-A 0000018762 RNC ! 123 --~ PDCP 122~ 121 RLC MAC/PHY 120 I4O -.1t NODE Bi~ 110 105 ---104 ---103 ---102 ---101 --- CODEC IP/UDP/RTP PDCP O0 RLC MAC/PHY FIG.1 (CONVENTIONAL ART) U.S. Patent Mar. 9, 2010 US 7,675,941 B2 Sheet 2 of 9 TRANSMITTER HIGHER LAYER RLC LAYER LOWER LAYER RADIO CHANNEL t._205 F 210 F 215 I FIG..2A (CONVENTIONAL ART) I I I I RECEIVER HIGHER LAYER ,.t, RLC LAYER f LOWER LAYER F 207 L 212 ~-- 217 f RADIO CHANNEL I FIG.2B (CONVENTIONAL ART) APLNDC-WH-A 0000018764 RLC SDU IP PACKET I\ I\ I \ I \ I \\\ RLC PDU 230 ~,-240 SEQUENCE NUMBER LI DATA FIELD FIG.2C (CONVENTIONAL ART) E E U.S. Patent Mar. 9, 2010 Sheet 4 of 9 US 7,675,941 B2 315 -320 325 -RLC SDU = 35 byte DATA FIELD : RLC SDU FIG.3 {CONVENTIONAL ART} 425 ---" DATA FIELD 430 ---- FIG.4 APLNDC-WH-A 0000018766 U.S. Patent Mar. 9, 2010 Sheet 5 of 9 US 7,675,941 B2 SN DATA PART = RLC SDU FIG.5A DATA PART FIG.5B APLNDC-WH-A 0000018767 U.S. Patent Mar. 9, 2010 Sheet 6 of 9 US 7,675,941 B2 605 RLC SDU 610 s, =x ~i~i~ 615 SN =x+l 1~,o,~ LI = 1111 100 FIRST SEGMENT INTERMEDIATE SEGMENT 620 SN =x+2 ~.1,~ LI = e.g. 0100 010 LAST SEGMENT FIG.6A 625 RLC SDU 630 635 640 SN = x LI = 0000 000 SN =x+l ~11"~. LI = new predefined value LI = e.g.0100 011 FIRST SEGMENT INTERMEDIATE SEGMENT LAST SEGMENT FIG.6B APLNDC-WH-A 0000018768 U.S. Patent Mar. 9, 2010 US 7,675,941 B2 Sheet 7 of 9 START) IRECEIVE RLC SDU ~-705 INFORM LOWER LAYER | OF SIZE AND NUMBER OF RLC SDUs ~ 710 715 ~YES SET F = 0 L725 SETF= 1 / INSERT SDU INTO DATA FIELD | OF RLC PDU WITHOUT LI ~730 SEND RLC PDU TO LOWER LAYER | ~735 INSERT PRE-DEFINED LI SEND RLC PDU TO LOWER LAYER h750 I / FIG.7 APLNDC-WH-A 0000018769 ~- START ~) RECEIVE RLC PDU F 805 STORE RLC PDU ACCORDING TO SN II ~ ~YES RLC PDU INCLUDES INTERMEDIATE SEGMENT ~ .] "] "* FORWARD RLC SDU TO HIGHER LAYER 815 ~ 850 820 ~NO ~ 830 yE£835 N° REASSEMBLE RLC SDU BASED ON LIE AND SN FIG.8 ~ 840 WAIT FOR NEXT RLC PDU F845 U.S. Patent Mar. 9, 2010 US 7,675,941 B2 Sheet 9 of 9 /905 /930 PDU SIZE CONTROLLER ITRANSMISSION BUFFER ~ /-925 ~ .~9~° F SETTER RLC’HEADER i INSERTER /920 TRANSMISSION I1_, PART I ~ /915 I LIINSERTERI FIG.9 REASSEMBLER 1010 RLC HEAOER AND LI REMOVER 025 REASSEMBLY CONTROLLER 1015 RECEPTION BUFFER 1020 RECEPTION PART FIG.10 APLNDC-WH-A 0000018771 US 7,675,941 B2 1 2 METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING PACKET DATA USING PRE-DEFINED LENGTH INDICATOR IN A MOBILE COMMUNICATION SYSTEM and sending it to a Core Network (CN) 130. The IP/UDP/RTP packet is sent to the other party, for example, a receiving UE (not shown) via an IP network 140. The receiving UE a layer structure analogous to that of the transmitting UE 100 and recovers the original voice signal by processing the IP/UDP/ PRIORITY RTP packet in the reverse order. The RLC layers 102 and 122 function as follows. This application claims the benefit 35 U.S.C. § 119(a) of In general, the RLC layer works in Unacknowledged Mode Korean Patent Application filed in the Korean Intellectual (UM), Acknowledged Mode (AM), or Transparent Mode Property Office on May 4, 2005 and assigned Serial No. 10 (TM). VoIP operates in the RLC UM. 2005-37774, the entire disclosure of which is hereby incorIn the transmitter, the RLC UM layer segments, concatporated by reference. enates, or pads RLC Service Data Units (SDUs) received from a higher layer to a size suitable for transmission on a BACKGROUND OF THE INVENTION radio channel. The RLC UM layer constructs an RLC PDU 15 suitable for transmission on the radio channel by inserting 1. Field of the Invention segmentation!concatenation!padding information and a The present invention relates generally to a mobile comsequence number into the resulting data and provides the munication system supporting packet service. More particuRLC PDU to a lower layer. larly, the present invention relates to a method and apparatus In the receiver, the RLC UM layer recovers data by interwhich efficiently use radio resources by reducing the header 2o preting the sequence number and segmentation!concatenasize of a Protocol Data Unit (PDU) to be transmitted on a tion/padding information of an RLC PDU received from a radio link. lower layer and re-constructs an RLC SDU by concatenating 2. Description of the Related Art or segmenting the data, in correspondence with the operation Today’s mobile communication systems are evolving of the transmitter. The reconstructed RLC SDU is provided to toward high-speed and high-quality wireless data packet 25 a higher layer. Processing an RLC SDU received from the communication systems. These systems are capable of prohigher layer to a size suitable for transmission on a radio viding data service and multimedia service in addition to the channel is called ’RLC framing’. traditional voice service. A 3rd generation mobile communiFIG. 2A illustrates conventional RLC framing in a transcation system using Wideband Code Division Multiple mitter. Access (WCDMA) based on the European Global System for 30 In FIG. 2, an RLC layer 210 frames data received from a Mobile communications (GSM) system and General Packet higher layer 205 to a suitable data size for transmission on a Radio Services (GPRS), Universal Mobile Telecommunicaradio channel. A lower layer 215 sends the framed data to a tion Service (UMTS) provides mobile subscribers or comreceiver on the radio channel. The higher layer 205 correputer users with a uniform service of transmitting packetsponds to a PDCP layer and the lower layer 215 corresponds based text, digitized voice, and video and multimedia data at 35 to a MAC layer. The data exchanged between the RLC layer or above 2 Mbps regardless of their locations around the 210 and the higher layer 205 is an ’RLC SDU’ and the data world. With the introduction of the concept of virtual access, exchanged between the RLC layer 210 and the lower layer the UMTS system allows access to any end point within a 215 is an ’RLC PDU’. network all the time. The virtual access refers to packetFIG. 2B illustrates conventional RLC framing in a receiver. switched access using a packet protocol like Internet Protocol 4o Referring to FIG. 2B, an RLC layer 212 recovers the origi(IP). nal data from data received from a lower layer 217 and proRegarding voice service, a standardization organization for vides the recovered data to a higher layer 207. The higher UMTS, 3rd Generation Partnership Project (3GPP) is dislayer 207 corresponds to a PDCP layer and the lower layer cussing Voice over IP (VoIP). VoIP is a technology for send217 corresponds to a MAC layer. The data exchanged ing a voice frame generated from an audio Coder and Decoder 45between the RLC layer 212 and the higher layer 207 is an (CODEC) in the form of an IP/User Datagram Protocol ’RLC SDU’ and the data exchanged between the RLC layer (UDP)/Real-time Transport Protocol (RTP) packet. VoIP 212 and the lower layer 217 is an ’RLC PDU’. facilitates the provision of voice service over a packet netFIG. 2C illustrates a conventional operation for constructwork. ing RLC PDUs by framing ofRLC SDUs in the RLC layer of EIG. 1 illustrates the configuration of a typical mobile 5o the transmitter. communication system supporting VoIE With reference to FIG. 2C, the RLC layer of the transmitter Referring to EIG. 1, a User Equipment (UE) 100 includes receives an RLC SDU 225 of a particular size, for example, a a CODEC 105 for converting a voice signal to a voice frame, 100-byte IP packet from the higher layer. If a data size transan IP/UDP/RTP layer 104 for converting the voice frame to an mittable on a radio channel is 40 bytes, the RLC layer segIP/UDP/RTP frame, a Packet Data Convergence Protocol 55 ments the RLC SDU 225 into three RLC PDUs 230, 235 and (PDCP) layer 103 for compressing the header of the IP/UDP/ 240. Each RLC PDU may have 40 bytes. Each RLC PDU also RTP packet, a Radio Link Control (RLC) layer 102 for conincludes an RLC header 245. verting the header-compressed IP/UDP/RTP packet to be The RLC header 245 includes a Sequence Number (SN) suitable for transmission on a radio channel, and a Medium 250, an E field 255, and at least one of a plurality of pairs of Access Control (MAC)/Physical (PHY) layer 101 for sending 6o Length Indicator (LI) field 260 and E field 265. The LI field the output of the RLC layer 102 on the radio channel. 260 is included according to segmentation. The SN field 250 Radio data from the UE 100 is delivered to a Radio Netindicates a 7-bit SN which increases monotonously by 1 for work Controller (RNC) 120 via the PHY layer (not shown) of every RLC PDU. SNs indicate the sequence of the RLC PDUs a Node B 110 on the radio channel. Like the UE 100. The 230,235 and 240. The E field 255, which is one bit, indicates RNC 120 is analogous to the UE 100 because it includes a 65 whether the following field is a Data field or an LI-E pair field. MAC layer 121, an RLC layer 122, and a PDCP layer 123, for The LI field 260 is 7 bits or 15 bits in size depending on converting the radio data to the original IP/UDP/RTP packet RLC framing. It indicates the position of a segment of the APLNDC-WH-A 0000018772 US 7,675,941 B2 3 4 RLC SDU 225 in a Data field 270 of the RLC PDU. The LI process, the RLC layer recognizes from the second LI that the remaining bits of the Data field of the RLC PDU 240 are field 260 indicates the start and end of the RLC SDU 225 padded bits. within the Data field 270 of the RLC PDU. The LI field 260 The conventional scheme in which the last byte of an RLC may also indicate whether padding is used. The LI field 260 is set to a value expressed in bytes, indicating the number of 5 SDU is indicated by an LI is efficient in cases where one RLC SDUI is segmented to a plurality ofRLC PDUs or a plurality bytes to the end of an RLC SDU from an RLC header. For ofRLC SDUs are concatenated to one RLC PDU. However, simplicity, the LI field 260 is assumed to be 7 bits. one concrete RLC SDU frequently corresponds to one RLC In the first byte of the first RLC PDU 230, the SN is set to a predetermined value ’x’ and the first E is set to ’1 ’, which PDU without any segmentation!concatenation!padding in implies that an LI-E pair resides in the following byte. In the 10 view of the nature of VoIP packets. In cases where a 12.2-kbps Adaptive Multi-Rate (AMR) second byte of the RLC PDU 230, the LI field indicates that CODEC is widely used in 3GPP, this AMR CODEC creates a the RLC SDU 225 starts from the first byte of the Data field of 7-byte or 32-byte voice frame every 20 msec. The voice frame the RLC PDU 230. This allows the LI field to be used in other is encapsulated with an IP/UDP/RTP header, header-cornways rather than just indicating the position of the last byte of 15 pressed in the PDCP layer, and then delivered to the RLC the RLC SDU. This LI is called ’pre-defined LI’. Pre-defined layer. The compressed header is typically 3 bytes, or occaLIs are discussed below. sionally ranges from 4 to 12 bytes. ’ 1111 100’: the first byte of the Data field in the RLC PDU Consequently, the size of an RLC SDU ranges from 10 to is the first byte of the RLC SDU. 19 bytes, or from 35 to 44 bytes. This RLC SDU is provided ’0000 000’: although the last byte of the RLC SDU is 2o to the RLC layer of the transmitter every 20 msec. The RLC included in the previous RLC PDU, an LI indicating that it is layer reconstructs one concrete RLS SDU to one RLC PDU not included in the previous RLC PDU. and sends it on a radio channel. As stated above, since the ’ 1111 111’: the remainder of the Data field of the RLC compressed header is usually 3 bytes in length, most RLC PDU are padding bits. SDUs are 10 or 35 bytes. Accordingly, it is preferable to Hence, the first LI field is set to the pre-defined LI ’ 1111 25 determine an RLC PDU size such that RLC SDUs of the most 100’ and ’0’ is inserted in the second E field to indicate that the frequent size can be efficiently processed. If the RLC PDU size is defined based on the most frequent next byte belongs to the Data field in the RLC PDU 230. RLS SDU size, most ofRLS SDUs are framed to RLC PDUs Accordingly, a 38-byte Data field of the 40-byte RLC PDU without segmentation/concatenation/padding. In this case, 230, except for the first two bytes, is used to carry the first 38 30 the conventional framing is not efficient. bytes of the RLC SDU 225. FIG. 3 illustrates a problem encountered with the convenIn the second RLC PDU 235, the SN is set to ’x+l’ and the tional framing. E is set to ’0’ indicating that the next byte is for the Data in the Referring to FIG. 3, a 35-byte RLC SDU 305 is created and first byte. Since the RLC PDU 235 does not include the first the size of an RLC PDU 310 is 38 bytes. The RLC SDU 305 byte or the last byte of the RLC SDU 225, there is no need to include an LI field. Therefore, the remaining 39 bytes of the 35 is framed to one RLC PDU 310. In the RLC PDU 310, a first LI 315 is set to ’ 1111 100’ which indicates that the first byte Data field carry 39 bytes of the RLC SDU 225, from byte 39 of the RLS SDU 305 corresponds to the first byte of a Data to byte 77. field 325 and a second LI 320 is set to ’0100 011’ which In the third RLC PDU 240, the SN is set to ’x+2’ and the E indicates that the last byte of the RLS SDU 305 corresponds is set to ’ 1’ indicating that the next byte is an LI-E pair in the 4o to the 35th byte of the Data field 325. The Data field 325 first byte. In the second byte, the LI is set to ’0010 111(23)’ carries the entire 35-byte RLC SDU 305. indicating that the last byte of the RLC SDU 225 corresponds Transmission of the 35-byte is accompanied by a 3-byte to the 23th byte (’100’-’77’) of the Data field, and the E field overhead, two bytes of which are used for the LI fields. is set to’ 1 ’. The Data field of the RLC PDU 240 still has room As described above, compared to typical packet commuto carry data, after loading the last segment of the 100-byte 45 nications, packet data needs to be processed in real time and RLC SDU 225. Therefore, the second E field is set to ’ 1’ and one RLC SDU is created at every predetermined time interval the second LI field is set to’ 1111 111 ’, which implies that bits in VoIR More specifically, one RLC SDU is converted to one following the position indicated by the first LI field are padRLC PDU without segmentation or concatenation in VoIP ded. The third E field is set to ’0’. Consequently, the Data field communications. Nonetheless, the conventional RLC framof the RLC PDU 240 is filled with the last 23 bytes of the RLC 50 ing always requires at least two LI fields, i.e. an LI indicating SDU 225 and a 14-byte padding. the start of an RLC SDU and another LI indicating the end of In accordance with the above RLC layer operation of the the RLC SDU for an RLC PDU. When necessary, an LI transmitter, the RLC layer of the receiver operates as follows. indicating whether a Data field is padded is additionally The RLC layer of the receiver receives the RLC PDUs 230, inserted. 235 and 240 and sequentially orders them based on their SNs. 55 Therefore, the conventional RLC framing leads to ineffiSpecifically, the RLC layer determines that the Data field of cient use of limited radio resources in VoIP due to the use of the first RLC PDU 230 corresponds to the first segment of the unnecessary LI fields. RLC SDU 225 referring to the LI field of the RLC PDU 230, Accordingly, there is a need for an improved system and and the Data field of the second RLC PDU 235 corresponds to method to efficiently use radio resources. the second segment of the RLC SDU 225 referring to the LI 60 field of the RLC PDU 235, thus considering that reconstrucSUMMARY OF THE INVENTION tion of the RLC SDU 235 is yet to be completed. Then the RLC layer determines from the first LI field of the RLC PDU An aspect of exemplary embodiments of the present inven240 that 23 bytes of the Data field of the RLC PDU 240 are the tion is to address at least the above problems and/or disadlast segment of the RLC SDU 225, and completes reconstruc- 65 vantages and to provide at least the advantages described tion of the RLC SDU 225 by combining the segments below. Accordingly, an aspect of exemplary embodiments of the present invention is to provide a method and apparatus for extracted from the three RLC PDUs 230,235 and 240. In this APLNDC-WH-A 0000018773 US 7,675,941 B2 5 6 efficiently using radio resources by reducing the header size a following segment, if the LI field is set to a predetermined of an RLC PDU in an RLC layer in a mobile communication value indicating inclusion of an intermediate segment of an SDU in a data field of the PDU. If the one-bit field indicates system supporting packet service. An exemplary embodiment of the present invention also the presence of the LI field, a header and LI remover extracts provides a method and apparatus for segmenting a higher- 5 an intermediate segment from the data field of the PDU by layer packet into a plurality of RLC PDUs. eliminating the SN field, the one-bit field, and the LI field. A According to one aspect of an exemplary embodiment of reassembler receives the intermediate segment from the header and LI remover and constructing the SDU by combinthe present invention, in a method of transmitting data using a pre-defined LI in a mobile communication system, an SDU ing the intermediate segment with at least one previous segis received from a higher layer and a determination is made as 10 ment extracted from a data field of at least one previous PDU to whether the SDU can be included in one PDU. If the SDU and at least one following segment extracted from a data field cannot be included in one PDU, the SDU is segmented into a of at least one following PDU. plurality of segments according to a transmittable PDU size. Other objects, advantages, and salient features of the invenA plurality of PDUs are constructed, which include the segtion will become apparent to those skilled in the art from the ments in data fields. Each PDU has a header with an SN field, 15 following detailed description, which, taken in conjunction at least one-bit field indicating the presence of an LI field, and with the annexed drawings, disclose exemplary embodiments the LI field. An LI field of a PDU with an intermediate of the invention. segment of the SDU in a data field is set to a predetermined BRIEF DESCRIPTION OF THE DRAWINGS value indicating the presence of the intermediate segment. The PDUs are sent to a receiver. 20 The above and other exemplary objects, features and According to another aspect of an exemplary embodiment of certain exemplary embodiments of the present invention, a PDU is received from a transmitter advantageswill become more apparent from of the present invention the following in a method of receiving data using a pre-defined LI in a mobile communication system. An SN field and a one-bit detailed description when taken in conjunction with the field indicating the presence or absence of a following LI field 25 accompanying drawings in which: FIG. 1 illustrates the configuration of a conventional are detected from a header of the PDU. If the one-bit field mobile communication system supporting VoIP; indicates the presence of the LI field, the following LI field is FIG. 2A illustrates a conventional transmission operation; detected from the header of the PDU. A determination is FIG. 2B illustrates a conventional reception operation; made as to whether the LI field is set to a predetermined value FIG. 2C illustrates a constructindicating inclusion of an intermediate segment of an SDU in 30 .lng RLC PDUs with conventional operation offraming in a an RLC SDU by RLC a data field of the PDU. If the LI field is set to the predetermined value, the PDU is stored until the PDU can be transmitter; FIG. 3 illustrates a problem encountered with the convenassembled with a previous segment and a following segment. tional RLC framing; The SDU is constructed by combining the intermediate segment from the data field of the PDU with at least one previous 35 an FIG. 4 illustrates the structure of an RLC PDU according to exemplary embodiment of the present invention; segment extracted from a data field of at least one previous FIG. 5A illustrates the structure of an RLC PDU according PDU and at least one following segment extracted from a data to an exemplary embodiment of the present invention, in field of at least one following PDU. cases where an RLC SDU corresponds to an RLC PDU withAccording to a further aspect of an exemplary embodiment segmentation!concatenation!padding; of the present invention, in an apparatus for transmitting data 4o outFIG. 5B illustrates the structure of an RLC PDU according using a pre-defined LI in a mobile communication system, a to an exemplary embodiment of the present invention, in transmission buffer receives an SDU from a higher layer, cases where an RLC SDU is framed to an RLC PDU by determines whether the SDU can be included in one PDU, segmentation/concatenation/padding; and reconstructs the SDU to at least one segment according to FIG. 6A illustrates segmentation of one a transmittable PDU size. A header inserter constructs at least 45 plurality ofRLC PDUs by the conventionalRLC SDU into a RLC framing; one PDU including the at least one segment in a data field and FIG. 6B illustrates segmentation of one RLC SDU into a including an SN field and a one-bit field in a header. A one-bit plurality ofRLC PDUs using a new pre-defined LI according field setter sets the one-bit field of the at least one PDU to to an exemplary embodiment of the present invention; indicate the presence or an absence of a following LI field. An is a flowchart illustrating an operation LI inserter inserts an LI field after the one-bit field in the at 5o FIG. 7PDU in an RLC layer according to for sending an RLC an exemplary least one PDU if the SDU cannot be included in one PDU, and embodiment of the present invention; sets an LI field to a predetermined value indicating inclusion is a flowchart illustrating an operation for receiving of an intermediate segment in a PDU including an interme- anFIG. 8 PDU in the RLC layer according to an exemplary RLC diate segment of the SDU in a data field. A transmitter sends the at least one PDU received from the LI inserter to a 55 embodimentaof the present invention; FIG. 9 is block diagram of a transmitter according to an receiver. exemplary embodiment of the present invention; and According to still another aspect of an exemplary embodiFIG. 1D is a block diagram of a receiver according to an ment of the present invention, in an apparatus for receiving exemplary embodiment of the present invention. data using a pre-defined LI in a mobile communication sysThroughout drawings, same tem, a reception buffer receives a PDU from a transmitter and 6o numerals willthe understood therefer todrawing reference be to the same elements, stores the PDU. A reassembly controller detects an SN field features, and structures. and a one-bit field indicating the presence or absence of a following LI field from a header of the PDU and interprets the DETAILED DESCRIPTION OF EXEMPLARY following LI field from the header of the PDU, if the one-bit EMBODIMENTS field indicates the presence of the LI field. The reassembly 65 controller also controls the reception buffer to store the PDU The matters defined in the description such as a detailed until the PDU can be assembled with a previous segment and construction and elements are provided to assist in a compre- APLNDC-WH-A 0000018774 US 7,675,941 B2 7 8 hensive understanding of the embodiments of the invention. RLC PDU without segmentation/concatenation/padding, it Accordingly, those of ordinary skill in the art will recognize sets the F field to ’0’ and inserts the RLC SDU in the Data field that various changes and modifications of the embodiments of the RLC PDU. described herein can be made without departing from the If the F field of a received RLC PDU is ’0’, a receiver scope and spirit of the invention. Also, descriptions of well- 5 extracts the Data field from the RLC PDU, considering that known functions and constructions are omitted for clarity and the Data field follows the F field, and provides the Data field conciseness. as an RLC SDU to the higher layer. Exemplary embodiments of the present invention are FIG. 5B illustrates the structure of an RLC PDU according directed to framing for efficient use of radio resources in a to an exemplary embodiment of the present invention, in mobile communication system for providing packet service. 10 cases where an RLC SDU is framed to an RLC PDU by An exemplary embodiment of the present invention will be segmentation/concatenation/padding. described below in the context of an operation in an RLC Referring to FIG. 5B, when the transmitter needs to perlayer, particularly an RLC UM operation in a UMTS system, form segmentation/concatenation/padding for RLC framing, to which the exemplary embodiment of the present invention it constructs an RLC PDU including an F field set to’ 1’ and LI is not limited. For simplicity, an RLC header is defined to15 fields and a Padding field which are needed for segmentation/ include an SN, the first E, and at least one LI-E pair in an RLC concatenation/padding. PDU with packet data from a higher layer. That is, the remainIf the F field of a received RLC PDU is ’ 1’, the receiver der of an RLC PDU, except a Data field, is an RLC header. determines that an LI field and an E field reside in one byte In accordance with an exemplary embodiment of the following the F field and reconstructs one or more RLC SDUs present invention, two kinds of framing are considered. One is 2o out of the Data field of the RLC PDU according to the value that the RLC layer frames an RLC SDU of the most frequent of the LI field. size to an RLC PDU without using any LI, and the other is that The requirements for using the conventional first E field as the RLC layer frames an RLC SDU of any other size to an an F field are discussed below. RLC PDU or RLC PDUs using an LI field. Conventionally, If an RLC PDU comprises a segment of an The former framing does not use any LI field. It is used in25 RLC SDU and the start and the end of the RLC SDU is not cases where the size of an RLC SDU is equal to that of the included in the RLC PDU, there is no LI in the RLC PDU. Data field of an RLC PDU and thus there is no need for Alternatively, no LI field is used when an RLC SDU is segmentation!concatenation!padding. framed to one RLC PDU without segmentation!concatenaThe latter framing requires an LI field. It is used in cases tion/padding. It is necessary to indicate that the RLC PDU where the size of an RLC SDU is different from that of the30 does not include one concrete RLC SDU and thus does not Data field of an RLC PDU and therefore segmentation!con- include the start or end of the RLC SDU in FIG. 5A. catenation/padding is needed. FIG. 6A illustrates segmentation of one RLC SDU into a Hence, a different framing scheme may apply to each plurality of RLC PDUs by the conventional RLC framing. higher-layer packet. A transmitter notifies a receiver of the Referring to FIG. 6A, an RLC SDU 605 is segmented into framing scheme used for the packet. 35 three RLC PDUs 610, 615 and 620 with SN ’x’, ’x+l’ and In an exemplary embodiment of the present invention, the ’x+2’, respectively. A pre-defined LI value of ’1111 100’ is framing scheme applied to an RLC PDU is indicated by one inserted in the first RLC PDU 610, thereby indicating that the bit of an RLC header, particularly one bit of the first E field. first byte of the Data field of the RLC PDU 610 corresponds The first E field is called an F field, to be distinguished from to the first byte of the RLC SDU 605. other E fields. 40 Since the start and the end of the RLC SDU 605 are not FIG. 4 illustrates the structure of an RLC PDU according to included in the second RLC PDU 615, the first E field of the second RLC PDU 615 is set to ’0’ and any LI field not is an exemplary embodiment of the present invention. Referring to FIG. 4, the RLC PDU includes an SN field inserted. An LI value of ’0100 010’, for example, is inserted 405, an F field 410, an LI field 415, an E field 420, a Data field in the third RLC PDU 620 in order to indicate that the end of 425, and a Padding 430. The LI field 415, the E field 420, and the RLC SDU 605 corresponds to the 34th byte of the Data 45 the Padding 430 may or may not be included depending on field of the RLC PDU 620. Regarding the RLC PDU 615 with no LI field due to the situations. However, the SN field 405, the F field 410, and the Data field 425 always exist. The SN field 405, the LI field 415, absence of the start or end of the RLC SDU, the receiver the E field 420, the Data field 425, and the Padding 430 may cannot determine whether the segment in the Data field of the have functionalities analogous to those of a conventional 50 RLC PDU 615 is one concrete RLC SDU or forms one concrete RLC SDU together with the previous and following RLC PDU. The F field 410 indicates a framing scheme used for an RLC PDUs. Therefore, in an exemplary embodiment of the RLC PDU, such as the presence or absence of the LI field 415. present invention, a novel LI value is defined to indicate an The F field 410 also indicates whether an RLC SDU has been RLC PDU that does not include the start or the end of an RLC framed to the RLC PDU 415 without segmentation!concat- 55 SDU (hereinafter, referred to as an intermediate PDU). The enation/padding. If the F field 410 is set to ’0’, the RLC PDU novel LI can be ’ 1111 110’, for example. An RLC PDU with 415 does not have the LI field 415 and the Data field 425 is the novel LI value is considered an intermediate RLC PDU. eventually the one concrete RLC SDU. If the F field 410 is set The Data field of the intermediate RLC PDU includes an RLC to ’ 1 ’, the RLC PDU 415 has the LI field 415 and the size of SDU segment between the start and end of the RLC SDU. the Data field 425 is not equal to that of the RLC SDU. Thus, 6o FIG. 6B illustrates segmentation of one RLC SDU into a the LI field 415 indicates the start or end of the RLC SDU. plurality ofRLC PDUs using a new pre-defined LI according FIG. 5A illustrates the structure of an RLC PDU according to an exemplary embodiment of the present invention. to an exemplary embodiment of the present invention, in Referring to FIG. 6B, an RLC SDU 625 is segmented into cases where an RLC SDU corresponds to an RLC PDU with- three RLC PDUs 630, 635 and 640 with SN ’x’, ’x+l’ and out segmentation/concatenation/padding. 65 ’x+2’, respectively. The F field is set to ’1’ and a pre-defined Referring to FIG. 5A, when a transmitter (an RLC layer in LI value of’ 1111 100’ is inserted in the first RLC PDU 630, the transmitter) can frame one concrete RLC SDU to one thereby indicating that the first byte of the Data field of the APLNDC-WH-A 0000018775 US 7,675,941 B2 9 10 pre-defined LI value is set by a system or a designer. In step RLC PDU 630 corresponds to the first byte of the RLC SDU 750, the RLC layer sends the RLC PDU to the lower layer, for 625. Since neither the start nor the end of the RLC SDU 625 transmission to the receiver. is included in the second RLC PDU 635, the F field of the second RLC PDU 635 is set to ’0’ and the new pre-defined LI FIG. 8 is a flowchart illustrating an RLC operation in the value of ’111 110’ is inserted to the second RLC PDU 635, 5 receiver according to an exemplary embodiment of the thereby indicating the RLC PDU 635 is an intermediate RLC present invention. PDU. Referring to FIG. 8, the RLC layer of the receiver receives An LI value of ’0100 011’, for example, is inserted in the an RLC PDU from the lower layer in step 805 and checks the third RLC PDU 640 to serve as an indication that the end of first E field (F field) of the RLC PDU in step 810. If the F field the RLC SDU 625 corresponds to the 35th byte of the Data 10 is ’1 ’, the RLC layer goes to step 820. If the F field is ’0’, the field of the RLC PDU 640. RLC layer proceeds to step 815. Now a description will be made of an operation and an If the F field is ’0’, this implies that segmentation!concatapparatus structure according to exemplary embodiments of enation!padding was not applied to the RLC PDU. Thus, the the present invention. Since concatenation in the RLC layer is RLC layer eliminates an RLC header (such as SN and F) from beyond the scope of exemplary embodiments of the present 15 the RLC PDU and reconstructs one concrete RLC SDU with invention, an operation and apparatus structure associated the remaining Data field in step 815. The Data field of the with the concatenation will not be described. It is clear that in RLC PDU becomes one concrete RLC SDU. In step 850, the case of concatenation, if the first E field (i.e. F field) is ’ 1 ’, at RLC layer provides the RLC SDU to the higher layer. least one LI field exists. If the F field is ’1’, this implies that segmentation!concatFIG. 7 is a flowchart illustrating an RLC operation in the 2o enation!padding was applied to the RLC PDU and at least one transmitter according to an exemplary embodiment of the LI field exists. In step 820, the RLC layer buffers the RLC present invention. PDU according to its SN in a reception buffer. Referring to FIG. 7, upon receipt of at least one RLC SDU In step 825, the RLC layer checks to determine whether the from the higher layer in step 705, the RLC layer of the first LI field of the RLC PDU is the new pre-defined value transmitter notifies the lower layer of the number and the size 25 ’ 1111 110’. In case of LI ’ 1111 110’, the RLC layer goes to of the at least one RLC SDU in step 710. The lower layer can step 830. Otherwise, it goes to step 835. The RLC layer be the MAC layer. When LI ’0000 000’ for transmission of determines that the RLC PDU includes an intermediate segthe RLC SDU, the RLC layer notifies the lower layer of ’the ment of the RLC SDU in step 830 and determines whether an size of the RLC SDU’+I. RLC SDU can be reassembled, such as, recovered by checkIn step 715, the RLC layer waits until the lower layer 30 ing the SNs and LIs ofRLC PDUs buffered in the reception reports the size and number of RLC PDUs to be transmitted buffer in step 835. Ifn RLC PDUs (n is an integer larger than for the next transmission interval. The lower layer determines 1) among buffered RLC PDUs with consecutive SNs fulfills the most efficient RLC PDU size based on the received RLC the following conditions, the RLC SDU can be reassembled. SDU information and the radio channel condition for the next Condition 1 : The last LI field of the first of the n RLC PDUs transmission interval and notifies the RLC layer of the RLC 35 indicates the start of a new RLC SDU. PDU size. Condition 2: The second to (n-1)th RLC PDUs each In step 720, the RLC layer determines whether the notified include one LI field set to ’ 1111 110’. RLC PDU size matches to the RLC SDU size. At the same Condition 3: The first LI field of the last (such as nth) RLC time, the RLC layer determines whether LI ’0000 000’ in a PDU indicates the position of the last byte of the RLC SDU. current RLC PDU according to whether the previous RLC 4o If there are n buffered RLC PDUs fulfilling the above PDU has an LI field indicating the last byte of the previous conditions, the RLC layer goes to step 840 and otherwise, it RLC SDU. If the RLC PDU size matches to the RLC SDU goes to step 845 and waits until a new RLC PDU is received. size and it is unnecessary to send an LI of’0000 000’, the RLC The RLC layer reassembles an RLC SDU, referring to the layer goes to step 725. When the sum of the RLC SDU size SNs and LIs of the RLC PDUs in step 840 and provides the and a minimum RLC header size is equal or approximate to 45 RLC SDU to the higher layer in step 850. the RLC PDU size, not greater than the RLC PDU size, it is FIG. 9 is a block diagram of a transmitter acting as a said that the RLC SDU size matches to the RLC PDU size. In transmitting RLC layer according to an exemplary embodiment of the present invention. other words, when the first E field (F field) of the RLC PDU is set to ’0’ and LI fields indicating the start and end of the Referring to FIG. 9, the transmitter includes a transmission RLC SDU are not used, the entire RLC SDU is carried in the 5o buffer 905, an RLC header inserter 910, an LI inserter 915, a Data field of the RLC PDU. transmission part 920, an F setter 925, and a PDU size conLI ’0000 000’, when the end of the previous RLC PDU troller 930. perfectly corresponds to the end of the previous RLC SDU The transmission buffer 905 buffers at least one RLC SDU and, LI field indicating the end of the previous RLC SDU is received from the higher buffer and notifies the PDU size not included in the previous RLC PDU. 55 controller 930 of the size and number of the at least one RLC The RLC layer sets the F field of the current RLC PDU to SDU. The PDU size controller 930 determines an RLC PDU ’0’ in step 725, inserts the entire RLC SDU in the Data field of size to ensure the highest transmission efficiency and notifies the RLC PDU without including any LI field in step 730, and the transmission buffer 905 of the RLC PDU size. sends the RLC PDU to the lower layer, for transmission to the The transmission buffer 905 reconstructs the at least one receiver in step 735. 6o RLC SDU to the RLC PDU size. If the size of an RLC SDU Alternatively, if the RLC PDU size does not match to the is equal to that of the Data field of an RLC PDU, the transRLC SDU size or LI ’0000 000’, the RLC layer sets the F bit mission buffer 905 simply provides the RLC SDU to the RLC of the current RLC PDU to ’ 1’ in step 740. In step 745, the header inserter 910 without any processing. The F setter 925 RLC layer determines whether there is an intermediate RLC controls the RLC header inserter 910 to set the F field of the PDU generated from the RLC SDU. When an intermediate 65 RLC PDU to ’0’ if the RLC SDU size is equal to the size of the RLC PDU exists, the only LI field of the intermediate RLC Data field. The RLC header inserter 910 inserts the F field and PDU is set to a novel pre-defined value’ 1111 110’. The novel an SN into the data received from the transmission buffer 905 APLNDC-WH-A 0000018776 US 7,675,941 B2 11 12 wherein if the data field of the PDU contains an intermeunder the control of the F setter 925. If the F field is set to ’0’, diate segment of the SDU, the LI field in the PDU the LI inserter 915 does not insert an LI field into the data contains the intermediate segment of the SDU is set to a received from the RLC header inserter 910. Alternatively, if predefined value indicating that the PDU contains neithe F field is ’1’, the LI inserter 915 inserts an LI field. The ther a first segment nor a last segment of the SDU; and transmission part 920 sends RLC PDUs created in the above 5 procedure on a radio channel. sending the PDUs to a receiver. FIG. 10 is a block diagram of a receiver operating as a 2. The method of claim 1, further comprising the step of, if receiving RLC layer according to an exemplary embodiment the SDU is comprised in one PDU, constructing one PDU of the present invention. comprising a header and a data field, Referring to FIG. 10, the receiver includes a reception part 10 wherein the header comprises a SN field, and a one-bit field 1020, a reception buffer 1015, an RLC header and LI remover indicating that the PDU contains the entire SDU in the 1010, a reassembler 1005, and a reassembly controller 1025. data field. The reception part 1020 provides an RLC PDU received 3. The method of claim 1, further comprising the step of, if from the lower layer to the reception buffer 1015. The recepa PDU size except the SN field and the one-bit field for a next tion buffer 1015 buffers the RLC PDU until it is reassembled 15 transmission interval matches to the size of the SDU, deterto an RLC SDU. The reassembly controller 1025 determines mining the PDU size according to the size of the SDU and a whether an RLC SDU assembly is possible by interpreting radio channel condition, determining that the SDU can be the Fs and LIs ofRLC PDUs buffered in the reception buffer comprised in one PDU. 1015, and controls the reception buffer 1015 to provide an 4. The method of claim 1, wherein LI fields of PDUs RLC PDU that can be reassembled to the RLC header and LI 20 comprising the first and last segments of the SDU in data remover 1010. fields are set to values indicating inclusion of the first segment The RLC header and LI remover 1010 eliminate an RLC of the SDU and inclusion of the last segment of the SDU. header and an LI (LIs) from the RLC PDU. If the RLC PDU 5. The method of claim 1, wherein the SDU comprises an has an F field set to ’0’, which implies that there is no LI field, internet protocol (IP) packet. only the RLC header is eliminated. 25 6. A method of receiving data in a mobile communication The reassembler 1005 reassembles an RLC SDU using the system, comprising: RLC PDU from which the RLC header and LI(s) are removed receiving a protocol data unit (PDU) from a transmitter and and provides the RLC SDU to the higher layer. For an RLC detecting a sequence number (SN) field and a one-bit PDU with an F set to ’0’, the reassembler 1005 constructs one 30 field indicating whether the PDU contains an entire serconcrete RLC SDU with data extracted form the Data field of vice data unit (SDU) in its data field from the header; the RLC PDU. For an RLC PDU with an F set to ’ 1’ and only if the one-bit field indicates that the PDU does not contain one LI set to’ 1111 110’, the reassembler 1005 constructs one an entire SDU in its data field, detecting the following RLC SDU by combining an intermediate SDU segment length indicator (LI) field from the header of the PDU, extracted from the Data field of the RLC PDU with SDU and determining whether the LI field is set to a value segments extracted from the previous and following RLC indicating that the PDU contains an intermediate segPDUs. ment that is neither a first segment nor a last segment of As described above, exemplary embodiments of the the SDU; present invention facilitate the efficient use of limited radio transmission resources by eliminating the need to insert addistoring the PDU until the PDU can be assembled with a tional information indicating the start/end/padding of an RLC 4o previous segment and a following segment, if the LI field SDU by use of one-bit information indicating the existence of is set to the predefined value; and one concrete RLC SDU in the Data field of an RLC PDU. constructing the SDU by combining the intermediate segSince an LI with a new pre-defined value is set in an RLC ment from the data field of the PDU with at least one PDU including only an intermediate segment of the RLC previous segment extracted from a data field of at least SDU, RLC SDU segmentation is facilitated. 45 one previous PDU and at least one following segment While the present invention has been shown and described extracted from a data field of at least one following PDU. with reference to certain exemplary embodiments thereof, it 7. The method of claim 6, further comprising, if the one-bit will be understood by those skilled in the art that various field indicates that the PDU contains the entire SDU in its data changes in form and details may be made therein without field, acquiring the entire SDU from the data field of the PDU. departing from the spirit and scope of the invention as defined 50 8. The method of claim 6, wherein the storing comprises by the appended claims and their equivalents. the steps of storing the PDU in a reception buffer according to the SN field of the PDU. What is claimed is: 9. The method of claim 8, wherein the constructing com1. A method of transmitting data in a mobile communicaprises constructing the SDU by combining segments tion system, comprising: 55 receiving a service data unit (SDU) from a higher layer and extracted from data fields of a set of PDUs stored in the reception buffer, if the first of the PDUs comprises an LI field determining whether the SDU can be comprised in one indicating inclusion of the first segment of the SDU, if at least protocol data unit (PDU); one intermediate PDU among the PDUs comprises an LI field if the SDU is not comprised in one PDU, segmenting the SDU into a plurality of segments according to a trans- 6o set to the value, and if the first LI field of the last of the PDUs indicates the position of the last byte of the SDU. mittable PDU size, and constructing one or more PDUs, each PDU comprising a header and a data field, 10. An apparatus for transmitting data in a mobile commuwherein the data field comprises a segment of the SDU, nication system, comprising: wherein the header comprises a serial number (SN) field, a a transmission buffer for receiving a service data unit one-bit field indicating that the PDU does not contain an 65 (SDU) from a higher layer, determining whether the entire SDU in the data field and at least one Length SDU can be comprised in one protocol data unit (PDU) segmenting the SDU into a plurality of segments accordIndicator (LI) field, APLNDC-WH-A 0000018777 US 7,675,941 B2 13 14 ing to a transmittable PDU size if the SDU does not be a reception buffer for receiving a protocol data unit (PDU) comprised in one PDU, and constructing one or more from a transmitter and storing the PDU; a reassembly controller for detecting a sequence number PDUs; (SN) field and a one-bit field indicating whether the a header inserter for constructing a header of each PDU, PDU contains an entire service data unit (SDU) in its wherein the header comprises a serial number (SN) field, 5 data field from the header, detecting the following length a one-bit field, at least one Length Indicator (LI) field; indicator (LI) field from the header of the PDU and a one-bit field setter for setting the one-bit field of the at determining whether the LI field is set to a predefined least one PDU to indicate whether the PDU contains an value indicating that the PDU contains an intermediate entire SDU in the data field; 10 segment that is neither a first segment nor a last segment an LI inserter for inserting an LI field after the one-bit field of the SDU if the one-bit field indicates that the PDU in the at least one PDU if the SDU is not comprised in does not contain an entire SDU in its data field; one PDU, and setting an LI field to a predefined value a header and LI remover for eliminating the SN field, the indicating that the PDU contains neither a first segment one-bit field, and the LI field if the one-bit field indicates nor a last segment of the SDU to contain the intermediate 15 that the PDU does not contain the entire SDU in its data segment of the SDU; and field,; and a transmitter for sending the PDUs to a receiver. a reassembler for receiving the intermediate segment from 11. The apparatus of claim 10, wherein if the SDU is the header and LI remover and constructing the SDU by comprised in one PDU, constructing one PDU comprising a combining the intermediate segment with at least one header and a data field, 2o previous segment extracted from a data field of at least wherein the header comprises a SN field, and a one-bit field one previous PDU and at least one following segment indicating that the PDU contains the entire SDU in the extracted from a data field of at least one following PDU. data field. 16. The apparatus of claim 15, wherein the header and LI remover eliminate the SN field and the one-bit field from the 12. The apparatus of claim 10, wherein ifa PDU size except the SN field and the one-bit field for a next transmission 25 PDU and acquire the entire SDU from the data field of the interval matches to the size of the SDU, the PDU size being PDU if the one-bit field indicates that the PDU contains the determined according to the size of the SDU and a radio entire SDU in its data field. channel condition, the transmission buffer determines that the 17. The apparatus of claim 15, wherein the reception buffer SDU can be comprised in one PDU. stores the PDU according to the SN field of the PDU. 18. The apparatus of claim 17, wherein the reassembler 13. The apparatus of claim 10, wherein the LI inserter sets 30 constructs the SDU by combining segments extracted from LI fields of PDUs comprising the first and last segments of the data fields of a set of PDUs stored in the reception buffer, if the SDU in data fields to values indicating inclusion of the first first of the PDUs comprises an LI field indicating inclusion of segment of the SDU and inclusion of the last segment of the the first segment of the SDU, if at least one intermediate PDU SDU. 14. The apparatus of claim ll), wherein the SDU comprises 35 among the PDUs comprises an LI field set to the value, and if the first LI field of the last of the PDUs indicates the position an internet protocol (IP) packet. of the last byte of the SDU. 15. An apparatus for receiving data in a mobile communication system, comprising: APLNDC-WH-A 0000018778

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