WO2009145420A1 - Procédé et système pour mettre au rebut des unités de données dans un système de communication mobile - Google Patents

Procédé et système pour mettre au rebut des unités de données dans un système de communication mobile Download PDF

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Publication number
WO2009145420A1
WO2009145420A1 PCT/KR2009/001431 KR2009001431W WO2009145420A1 WO 2009145420 A1 WO2009145420 A1 WO 2009145420A1 KR 2009001431 W KR2009001431 W KR 2009001431W WO 2009145420 A1 WO2009145420 A1 WO 2009145420A1
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WIPO (PCT)
Prior art keywords
sdu
pdu
rlc
layer
discarding
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PCT/KR2009/001431
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English (en)
Inventor
Vinay Kumar Shrivastava
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present disclosure relates generally to the field of wireless telecommunication. More particularly, the present disclosure relates to a method and a system for discarding data units in a mobile communication system.
  • a protocol layer for example a Radio Link Control (RLC) layer, receives a payload from an upper layer and sends the payload to a lower layer after adding control information specific to the protocol layer to a lower layer.
  • RLC Radio Link Control
  • Example of the upper layer includes, but is not limited to, a Protocol Data Convergence Protocol (PDCP) layer.
  • PDCP Protocol Data Convergence Protocol
  • Example of the lower layer includes, but is not limited to, a Medium Access Control (MAC) layer.
  • SDU service data unit
  • PDU protocol data unit
  • the protocol layer also receives PDUs from the lower layer and removes the control information to generate the SDUs.
  • the SDUs are then sent to the upper layer.
  • it is required to discard the SDUs at the protocol layer due to various reasons, for example during handover scenarios when a user moves from one location to another location, due to constraints in quality of service or application requirements wherein transmission delay is restricted, when the timer at the upper layer expires in an unacknowledged or acknowledged mode of data transfer, or based on a peer entity status report received by the upper layer in an acknowledged mode.
  • One technique for discarding the SDU at the RLC layer includes discarding the SDUs meeting certain conditions, for example the SDUs for which no segment has been mapped to any PDU.
  • the technique is limited to discarding the SDUs meeting the certain conditions. Not discarding the SDUs which does not meet the certain conditions can lead to bandwidth and transmission overhead. Further, the delivery of SDUs which are next in line for transmission is delayed as the SDUs which do not meet the certain conditions are not discarded. Moreover, the situation worsens in cases where the SDUs not meeting such certain conditions are in plenty or the size of the SDUs is large.
  • Embodiments of the present disclosure described herein provide a method and system for discarding data units in a mobile communication system.
  • An example of a method for discarding data units in a mobile communication system with layered protocol architecture includes identifying a service data unit (SDU) of a radio link control (RLC) layer by a protocol data convergence protocol (PDCP) layer for discarding.
  • the RLC layer and the PDCP layer correspond to a transmitting unit.
  • the method also includes discarding the SDU and at least one protocol data unit (PDU) of the RLC layer by the RLC layer if the SDU is partially mapped to the at least one PDU. Further, the method includes mapping a first byte of a subsequent un-discarded SDU of the RLC layer with a first byte of a subsequent PDU of the RLC layer. Furthermore, the method includes transmitting the subsequent PDU to a receiving unit.
  • the method also includes discarding segments of the SDU received by the RLC layer of the receiving unit and at least one PDU corresponding to the segments of the SDU based on the subsequent PDU.
  • An example of a system for discarding data units includes a transmitting unit and a receiving unit.
  • the transmitting unit includes a protocol data convergence protocol (PDCP) layer for identifying a service data unit (SDU) for discarding.
  • the transmitting unit also includes a radio link control (RLC) layer for discarding the SDU if the SDU is partially mapped to at least one protocol data unit (PDU) of the RLC layer, for discarding the at least one PDU, and mapping a first byte of a subsequent un-discarded SDU of the RLC layer with a first byte of a subsequent PDU of the RLC layer.
  • PDCP protocol data convergence protocol
  • RLC radio link control
  • the receiving unit includes a RLC layer for discarding segments of the SDU received by the RLC layer of the receiving unit and at least one PDU corresponding to the segments of the SDU based on the framing information field header in subsequent PDU.
  • the receiving unit also includes, a PDCP layer of the receiving unit for receiving information regarding the discarding performed at the receiving unit.
  • Various embodiments provide an efficient discarding mechanism in the mobile communication systems.
  • the un-transmitted RLC SDUs, and partially mapped RLC SDUs and the corresponding RLC PDUs are discarded, resulting in saving transmission time and optimizing the bandwidth.
  • FIG. 1 is a block diagram of an environment, in accordance with which various embodiments can be implemented;
  • FIG. 2 is an example of a layered protocol architecture, in accordance with one embodiment
  • FIG. 3 is an exemplary overview model of layers of a transmitting unit and a receiving unit, in accordance with one embodiment
  • FIG. 4 depicts a method for discarding data units in a mobile communication system, in accordance with one embodiment
  • FIG. 5 is an example of a protocol data unit (PDU) format for unacknowledged mode radio link control (UM RLC) entity, in accordance with one embodiment
  • FIG. 6 is an example of a PDU format for acknowledged mode radio link control (AM RLC) entity, in accordance with one embodiment.
  • AM RLC acknowledged mode radio link control
  • FIG. 7 illustrates framing information (FI) field header, in accordance with one embodiment.
  • Embodiments of the present disclosure described herein provide a method and system for discarding data units in a mobile communication system.
  • FIG. 1 is a block diagram of an environment 100, in accordance with which various embodiments can be implemented.
  • the environment 100 includes a transmitting unit 105 and a receiving unit 110.
  • the transmitting unit 105 described herein refers to a unit that transmits a data unit to another unit.
  • the receiving unit 110 described herein refers to a unit that receives a data unit from another unit.
  • Examples of the transmitting unit 105 include, but are not limited to, a mobile phone, a computer, a laptop and a personal digital assistant (PDA).
  • Examples of the receiving unit 110 include, but are not limited to, a network, and an enhanced node B network (ENB).
  • ENB enhanced node B network
  • the transmitting unit 105 is one of the mobile phone, the computer, the laptop, and the PDA
  • the receiving unit 110 can be one of the network, and the ENB.
  • the transmitting unit 105 is one of the network, and the ENB
  • the receiving unit 110 can be one of the mobile phone, the computer, the laptop, and the PDA.
  • FIG. 2 is an example of a layered protocol architecture, in accordance with one embodiment.
  • the layered protocol architecture is present in both, a transmitting unit and a receiving unit.
  • the layered protocol architecture includes a radio resource control (RRC) layer 205, a protocol data convergence protocol (PDCP) layer 210, a radio link control (RLC) layer 215, a medium access control protocol (MAC) layer 220 and a physical layer 225.
  • RRC radio resource control
  • PDCP protocol data convergence protocol
  • RLC radio link control
  • MAC medium access control protocol
  • the layered protocol architecture is included in the transmitting unit.
  • the PDCP layer 210 sends a RLC SDU to the RLC layer 215.
  • the RLC SDU can be defined as a data unit received by RLC layer 215 from the PDCP layer 210.
  • a RLC PDU can be defined as a data unit sent by RLC layer 215 to the MAC layer 220.
  • the layered protocol architecture is included in the transmitting unit.
  • the PDCP layer 210 receives the SDU from the RRC layers 205, upper layers or applications, and converts the SDU to the corresponding PDU.
  • the PDCP layer 210 sends the PDU to the RLC layer 215.
  • the RLC layer 215 converts RLC SDU segments to RLC PDU segments and sends it to the MAC layer 220.
  • the MAC layer 220 sends the PDUs to the physical layer 225.
  • the PDUs are then converted to radio signals and are transmitted to the receiving unit.
  • the layered protocol architecture is included in the receiving unit.
  • the received radio signals are converted into PDUs.
  • the physical layer 225 sends the PDUs to the MAC layer 220.
  • the MAC layer 220 sends the PDUs to the RLC layer 215.
  • the RLC layer 215 receives the PDUs and sends to the PDCP layer 210.
  • the PDCP layer 210 then sends the PDUs to the RRC layer 205, upper layers or applications.
  • FIG. 3 is an example overview model of layers of a transmitting unit and a receiving unit, in accordance with one embodiment.
  • Various modes of the transmitting and receiving RLC entities include a transparent mode (TM), an unacknowledged mode (UM) and an acknowledged Mode (AM).
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged Mode
  • the transmitting RLC entity 305a of the ENB transmits the PDU to the UE.
  • a receiving RLC entity 310a receives the PDU.
  • the transmitting RLC entity 305b of the UE transmits the PDU to the ENB.
  • a receiving RLC entity 310b receives the PDU.
  • the transmitting RLC entity 315a of the ENB transmits the PDU to the UE.
  • a receiving RLC entity 320a receives the PDU.
  • the transmitting RLC entity 315b of the UE transmits the PDU to the ENB.
  • a receiving RLC entity 320b receives the PDU.
  • the RLC entity of the ENB 325a and the UE 325b transmits and receives the PDU.
  • FIG. 4 depicts a method for discarding data units in a mobile communication system, in accordance with one embodiment
  • a RLC layer of a transmitting unit receives a RLC SDU from a PDCP layer of the transmitting unit.
  • the segments of the RLC SDU are mapped to one or more RLC PDUs by the RLC layer.
  • the RLC SDU can be defined as a data unit received by RLC layer from the PDCP layer.
  • the RLC PDU can be defined as a data unit sent by the RLC layer to the MAC layer.
  • the PDCP layer of the transmitting unit identifies the SDU of the RLC layer for discarding.
  • the identification can be based on at least one of constraints in quality of service, transmission delay permits, status report received from peer entity, timer based, handover process and signaling strength.
  • the identification can include checking a timer corresponding to the RLC SDU in the PDCP layer of the transmitting unit if the RLC SDU corresponds to UM or AM RLC entity.
  • the RLC SDUs are PDCP PDUs. All PDCP PDUs of a PDCP SDU for which the timer has expired needs to be discarded.
  • a new timer discard_timer is started at PDCP layer upon reception of a PDCP SDU from upper layer, that is, layer or application above PDCP. If the discard_timer expires for a PDCP SDU then, the PDCP layer discards the PDCP PDU along with the corresponding PDCP SDU. If the corresponding PDCP PDU has already been submitted to lower layer, that is, RLC, then the discard is indicated to RLC.
  • steps 410 to 445 can be performed for each of RLC SDU indicated by the PDCP layer.
  • the steps can be performed in parallel for different SDU. For example, a SDU can be transmitted as shown in step 425 and another SDU can be discarded as shown in step 445 simultaneously.
  • a check is performed to identify if the RLC SDU is mapped partially to at least one RLC PDU of the RLC layer.
  • step 420 is performed. At step 420, another check is performed to identify if the RLC SDU is completely mapped to at least one RLC PDU of the RLC layer.
  • the PDUs are transmitted to a RLC layer of the receiving unit and the corresponding SDU is not discarded at the RLC layer of the transmitting unit.
  • step 415 if the SDU is partially mapped to at least one PDU of the RLC layer at the transmitting unit then step 430 is performed.
  • step 430 is performed.
  • the RLC SDU and the corresponding RLC PDU is discarded.
  • a first byte of a subsequent un-discarded SDU of the RLC layer is mapped with a first byte of a subsequent PDU of the RLC layer and is indicated in FI field.
  • the RLC entity discards the indicated RLC SDU if all the segments of the RLC SDU are not mapped or transmitted as RLC data PDUs.
  • the subsequent un-discarded RLC SDU is mapped to next sequence numbered RLC PDU so that the first byte of SDU starts from the first byte of PDU.
  • the mapping is indicated in the FI header field of the PDU.
  • the receiving UM RLC entity reassembles RLC SDUs from UM data (UMD) PDUs.
  • the in-sequence delivery described herein refers to delivering SDUs to PDCP in the same sequence order, as the sequence number of PDUs from which they are reassembled. The first byte and the last byte of the RLC SDUs or SDU segments are indicated by the FI field header. If a reassembled RLC SDU is incomplete then the receiving UM RLC entity detects the SDU discard at the transmitting UM RLC entity and discards the incompletely received SDU.
  • the discarding at the receiving unit includes determining incapability of the at least one PDU corresponding to the segments of the SDU to assemble the SDU based on framing information field header of the subsequent PDU.
  • the subsequent PDUs are transmitted to the receiving unit.
  • the PDUs are received by the RLC layer of the receiving unit. Based on the FI field header, the RLC SDUs are reassembled by the RLC layer of the receiving unit.
  • the discarding at the receiving unit includes determining incapability of the at least one PDUs corresponding to the segments of the SDUs to reassemble the SDU based on framing information field header of the subsequent PDU.
  • the transmitting RLC entity of the transmitting unit transmits the PDU to the receiving unit.
  • a receiving RLC entity receives the PDU.
  • the receiving side of UM RLC entity reassembles the received out of sequence RLC SDUs from RLC data PDUs and delivers to the upper layers.
  • the out-of-sequence delivery described herein refers to delivering SDUs to PDCP not in the same sequence order as the sequence number of PDUs from which they are reassembled. If the reassembling of the SDU to PDU is incomplete then, the incomplete reassembling is indicated in the FI header. If the FI field in the subsequent PDU indicates the start of a new SDU, then the SDU discard at the transmitter is detected and the incompletely received SDU is also discarded.
  • the RLC entity of the transmitting unit transmits the PDU to the receiving unit.
  • a receiving RLC entity receives the PDU.
  • the transmitting unit AM RLC entity discards the indicated RLC SDU. If all the segments of the RLC SDU are not mapped or transmitted as RLC data PDUs then, the subsequent un-discarded RLC SDU is mapped to next sequence numbered RLC PDU so that the first byte of SDU starts from the first byte of PDU and is indicated in the FI header field of the PDU.
  • the AM RLC entity receiving the SDU, reassembles RLC SDU from AM data (AMD) PDUs. If the reassembled RLC SDU is incomplete then the incomplete status is indicated by the FI field header.
  • AMD AM data
  • the AM RLC entity at the receiving unit reassembles the received out of sequence RLC SDUs from RLC data PDUs and delivers to the upper layers. If the reassembling of the SDU from PDUs is incomplete at the receiving unit then, the incomplete reassembling is indicated in the FI header. If the FI field indicates the start of a new SDU in the subsequent PDU, then the SDU discard is detected at the receiving unit and the incompletely received SDU is also discarded.
  • the RLC informs PDCP regarding the discarded SDU and the corresponding PDU in both receiving unit and transmitting unit.
  • the RLC entity of the transmitting unit discards the indicated RLC SDU if all the segments of the RLC SDU are not mapped or not transmitted as RLC data PDUs.
  • the subsequent un-discarded RLC SDU is mapped to next sequence numbered RLC PDU so that the first byte of SDU starts from the first byte of PDU and is indicated in the FI header field of the PDU.
  • step 450 the method stops.
  • a discard is indicated by PDCP for a SDU X for which a segment, as PDU N, has been transmitted.
  • the RLC discards the SDU X based on indication from PDCP.
  • the subsequent PDU N+1 starts with new SDU Y from first byte and is indicated in FI field.
  • the SDU X attempts to reassemble.
  • receiver interprets SDU X is discarded at the transmitting unit, and it discards incompletely received SDU X and starts reassembling SDU Y.
  • one or more steps of the method described in FIG. 4 can be implemented using a computer program product.
  • the computer program product include, but are not limited to, a floppy disk, a flexible disk, hard disk, magnetic tape, or any other magnetic medium, a CD-ROM, any other optical medium, punchcards, papertape, any other physical medium with patterns of holes, a RAM, a PROM, and EPROM, a FLASH-EPROM, any other memory chip or cartridge.
  • FIG. 5 is an example of a protocol data unit (PDU) format for UM RLC entity, in accordance with one embodiment.
  • PDU protocol data unit
  • the one bit reserved fields 505, 510 and 515 in the UM RLC entity are indicated as R1 in the FIG.5.
  • the other field includes a two bit framing information (FI) field (F1) 520, and an extension bit (E) field 525 and five or ten bit sequence number (SN) field 530.
  • FI framing information
  • E extension bit
  • SN five or ten bit sequence number
  • FIG. 6 is an example of a protocol data unit (PDU) format for AM RLC entity, in accordance with one embodiment.
  • PDU protocol data unit
  • the fields of the AM RLC entity include one bit data or control (D/C) field 605, one bit re-segmentation field (RF) field 610, a polling bit (P) field 615, a two bit FI field header fields 620, an extension bit (E) field 625, and a ten bit sequence number (SN) fields 630.
  • D/C data or control
  • RF re-segmentation field
  • P polling bit
  • E extension bit
  • SN ten bit sequence number
  • FIG. 7 is a table 700 illustrating FI field header, in accordance with one embodiment.
  • a binary value "00" is included in the FI field header.
  • first byte of the data field corresponds to the first byte of a RLC SDU and Last byte of the data field does not correspond to the last byte of a RLC SDU then a binary value "01"is included in the FI field header.
  • a binary value "10" is included in the FI field header.
  • first byte of the data field does not correspond to the first byte of a RLC SDU and if last byte of the data field does not correspond to the last byte of a RLC SDU then a binary value "11" is included in the FI field header.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé et sur un système pour mettre au rebut des unités de données dans un système de communication mobile, lequel procédé comprend les étapes consistant à : identifier une unité de données de service (SDU) d'une couche de commande de liaison radio (RLC) par une couche de protocole de convergence de données de protocole (PDCP) pour la mise au rebut; mettre au rebut la SDU et au moins une unité de données de protocole (PDU) de la couche RLC par la couche RLC si la SDU est partiellement mappée sur l'au moins une PDU; mapper un premier octet d'une SDU non mise au rebut ultérieure de la couche RLC avec un premier octet d'une PDU ultérieure de la couche RLC; transmettre la PDU ultérieure; et mettre au rebut des segments de la SDU reçue par la couche RLC de l'unité de réception et au moins une PDU correspondant aux segments de la SDU sur la base de l'en-tête de champ d'informations de verrouillage de trame dans une PDU ultérieure. Le système comprend une unité de réception et une unité d'émission pour effectuer une mise au rebut.
PCT/KR2009/001431 2008-03-31 2009-03-20 Procédé et système pour mettre au rebut des unités de données dans un système de communication mobile Ceased WO2009145420A1 (fr)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2011077184A1 (fr) * 2009-12-21 2011-06-30 Nokia Corporation Appareil et procédé pour traiter des unités de données de protocole valides
JP2013201529A (ja) * 2012-03-23 2013-10-03 Nec Infrontia Corp 通信システム、通信方法、及び通信プログラム
CN110167146A (zh) * 2018-02-12 2019-08-23 维沃移动通信有限公司 一种sdu的处理方法和通信设备
WO2020061912A1 (fr) * 2018-09-27 2020-04-02 Lenovo (Beijing) Limited Suppression d'unités de données de service de commande de liaison radio

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WO2004112305A1 (fr) * 2003-06-18 2004-12-23 Utstarcom (China) Co. Ltd. Procede et appareil permettant d'ecarter des unites de donnees de services dans un mode accuse de reception d'une rlc dans un systeme de communication sans fil
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WO2004042953A1 (fr) * 2002-11-07 2004-05-21 Lg Electronics Inc. Procede de deplacement d'une fenetre de reception dans un reseau a acces radio
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011077184A1 (fr) * 2009-12-21 2011-06-30 Nokia Corporation Appareil et procédé pour traiter des unités de données de protocole valides
US20120230180A1 (en) * 2009-12-21 2012-09-13 Nokia Corporation Apparatus and method for handling valid protocol data units
US9025433B2 (en) 2009-12-21 2015-05-05 Nokia Corporation Apparatus and method for handling valid protocol data units
JP2013201529A (ja) * 2012-03-23 2013-10-03 Nec Infrontia Corp 通信システム、通信方法、及び通信プログラム
CN110167146A (zh) * 2018-02-12 2019-08-23 维沃移动通信有限公司 一种sdu的处理方法和通信设备
CN110167146B (zh) * 2018-02-12 2023-06-09 维沃移动通信有限公司 一种sdu的处理方法和通信设备
WO2020061912A1 (fr) * 2018-09-27 2020-04-02 Lenovo (Beijing) Limited Suppression d'unités de données de service de commande de liaison radio
US11582160B2 (en) 2018-09-27 2023-02-14 Lenovo (Beijing) Limited Discarding radio link control service data units

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