US20060245430A1 - Method and Apparatus of a Procedure for Receiving Window Size Reconfiguration in a Communication System - Google Patents

Method and Apparatus of a Procedure for Receiving Window Size Reconfiguration in a Communication System Download PDF

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Publication number
US20060245430A1
US20060245430A1 US11/379,576 US37957606A US2006245430A1 US 20060245430 A1 US20060245430 A1 US 20060245430A1 US 37957606 A US37957606 A US 37957606A US 2006245430 A1 US2006245430 A1 US 2006245430A1
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Prior art keywords
acknowledged
receiver
status report
transmitter
receiving window
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Abandoned
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US11/379,576
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English (en)
Inventor
Sam Shiaw-Shiang Jiang
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Innovative Sonic Ltd
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Asustek Computer Inc
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Priority to US11/379,576 priority Critical patent/US20060245430A1/en
Assigned to ASUSTEK COMPUTER INC. reassignment ASUSTEK COMPUTER INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JIANG, SAM SHIAW-SHIANG
Publication of US20060245430A1 publication Critical patent/US20060245430A1/en
Assigned to INNOVATIVE SONIC LIMITED reassignment INNOVATIVE SONIC LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASUSTEK COMPUTER INC.
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1832—Details of sliding window management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/187—Details of sliding window management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/22—Traffic shaping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H04L47/263—Rate modification at the source after receiving feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H04W74/06—Scheduled access using polling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

Definitions

  • the present invention is a method and a device of a procedure for reconfiguring receiving window size of a receiver in a transmitter of a communications system.
  • the present invention prevents the transmitter from discarding the packets and hence prevents initiating a reset procedure. Therefore the communications system maintains a robust and efficient transmission.
  • the third generation mobile communications system was developed to have better usage of the frequency spectrum and higher-speed transmission service.
  • the third generation mobile communication uses a Wideband Code Division Multiple Access (WCDMA) protocol for wireless access.
  • WCDMA Wideband Code Division Multiple Access
  • the WCDMA protocol provides a more efficient channel usage, outstanding coverage, and high quality, high-speed multimedia data transmission.
  • the WCDMA protocol can satisfy different service requirements of QoS, provide flexible duplex transmission services, and also provide better communication quality.
  • a sequence number is added to a header of a Protocol Data Unit (PDU) to have synchronization and transmission robustness between a receiver and a transmitter.
  • the receiver is able to compare an SN of a PDU received with an expected SN to determine whether the PDU received is correct.
  • the transmitter and the receiver have a transmitting window and a receiving window respectively. Taking the receiving window as an example, an SN of a PDU received by the receiver must lie inside the receiving window, if not, the PDUs received is not processed. Therefore, transmission errors due to noise interferences are avoided.
  • the receiving window size can be reduced by the system in order to save buffer usage.
  • reconfiguring a receiving window size may initiate an unnecessary reset procedure.
  • Variable VR(R) represents an SN following that of a last in-sequence PDU received. The initial value is 0.
  • Variable VR(H) represents an SN following a highest SN of any received PDU.
  • Variable VR(MR) represents an SN following a PDU of a highest SN that shall be accepted by the receiver, meaning VR(MR) is the sum of VR(R) and the receiving window size.
  • Variable VT(S) represents an SN of a next PDU to be transmitted for a first time. It shall be updated after the aforementioned PDU is transmitted. The initial value is 0.
  • Variable VT(A) represents an SN following an SN of a last in-sequence acknowledged PDU. It shall be updated based on a receipt of a status report unit including a positively acknowledged message.
  • Variable VT(MS) represents an SN of a first PDU that is outside the transmitting window and shall not be transmitted by the transmitter.
  • the transmitter receives a status report unit from the receiver, the variables VT(A) and VT(MS) are updated and whether a PDU is negative acknowledged is determined according to the status report. If so, a retransmission procedure is initiated to retransmit the PDU. The PDU that had been negatively acknowledged will only be retransmitted once.
  • the receiver In Acknowledged Mode (AM), when the receiver receives a command for reconfiguring the receiving window size, the receiver updates the variable VR(MR), and determines whether there is a PDU whose SN lies in the range of larger than or equal to the variable VR(MR) and smaller than the variable VR(H). If so, the PDU is discarded and treated as never received. Thus, if the system reduces the receiving window size so that some PDUs stored in a buffer of the receiver may be outside the new receiving window, the prior art discards the PDUs outside the new receiving window and treats them as not received.
  • AM Acknowledged Mode
  • PDUs temporarily stored in the buffer of the receiver are PDUs that have been successfully received and not yet delivered to an upper layer.
  • a status report unit transmitted by the receiver informs the transmitter of positive acknowledgements of PDUs that have been received successfully, and the transmitter discards PDUs that have been positively acknowledged by the receiver. Consequently, when the system reconfigures the receiving window size, PDUs lying outside a new receiving window will be discarded by the receiver, and the transmitter having been informed that the discarded PDUs are positively acknowledged through a status report will also discard the PDUs from its buffer. Since the receiver treats the PDUs discarded as not received, the receiver will request retransmission of the PDUs after the receiving window advances. However, because the transmitter has discarded the PDUs from the buffer, retransmission requests from the receiver cannot be fulfilled. This causes the system to initiate a reset procedure and hence reduces transmission efficiency.
  • a method of processing reconfiguration of a receiving window size of a receiver in a transmitter of a communications system includes receiving a status report unit from the receiver and updating a first parameter indicating a sequence number following a sequence number of a last in-sequence acknowledged packet and a second parameter indicating a sequence number following a sequence number of a last packet within a transmitting window according to the status report unit.
  • the transmitter retains packets that have been positively acknowledged according to the status report unit and have sequence numbers larger than the first parameter in a buffer of the transmitter.
  • the transmitter marks the packets that have been positively acknowledged according to the status report unit and have sequence numbers larger than the first parameter as positively acknowledged packets.
  • the second parameter is updated according to a command for reconfiguring the receiving window size of the communications system. Packets with sequence numbers larger than or equal to the updated second parameter are marked as not yet acknowledged packets.
  • FIG. 1 is a flow chart of a procedure of an embodiment of the present invention.
  • FIG. 2 is a block diagram of a communications transmission device used in a communications system.
  • FIG. 3 is a diagram of the program code in FIG. 2 .
  • FIG. 2 is a block diagram of a communications transmission device 200 used in a communications system.
  • the communications system can be a 3 rd generation mobile communications system.
  • FIG. 2 only shows an input device 202 , an output device 204 , a control circuit 206 , a central processor 208 , a storage device 210 , a program code 212 , and a transceiver 214 of the wireless communications transmission device 200 .
  • the control circuit 206 executes the program code 212 stored in the storage device 210 with the central processor 208 , and then controls operations of the wireless communication transmission device 200 .
  • the wireless communications transmission device 200 can receive signals input by users through the input device 202 , or output signals through the output device 204 .
  • the transceiver 214 is used for receiving or transmitting radio signals.
  • the transceiver 214 is known as a part of Layer one, whereas the control circuit 206 is an application of Layer two and Layer three.
  • FIG. 3 is a schematic diagram of the program code 212 in FIG. 2 .
  • the program code 212 comprises an application program layer 300 , a Layer three interface 302 , a Layer two interface 306 , and a Layer one interface 318 .
  • the Layer two interface 306 stores a plurality of Service Data Units (SDUs) 308 , which are submitted from the Layer three interface 302 , in a buffer 312 .
  • the Layer two interface 306 generates a plurality of Protocol Data Units (PDUs) 314 according to the SDUs 308 stored in the buffer 312 , and outputs the PDUs 314 generated to a destination through the Layer one interface 318 .
  • SDUs Service Data Units
  • PDUs Protocol Data Units
  • the program code 212 receives a status report unit 310 or a piggybacked status report unit 310 of a receiver from the Layer one interface 308 , in order to detect a receiving status of the receiver.
  • the present invention provides new logic to process reconfiguration of the receiving window size in the program code 212 , in order to avoid unnecessary initiation of a reset procedure.
  • FIG. 1 is a flow chart of a procedure 10 of an embodiment of the present invention.
  • the procedure 10 is used to process, in a transmitter of a communications system, reconfiguration of a receiving window size of a receiver in the communications system.
  • the procedure 10 comprises the following steps:
  • Step 100 start.
  • Step 102 receive a status report from the receiver.
  • Step 104 update VT(A), VT(MS).
  • Step 106 detect whether the receiver has a PDU with negative acknowledgement. If so, go to step 108 ; if not, go to step 110 .
  • Step 108 initiate a retransmission procedure.
  • Step 110 detect whether the receiver has a PDU with positive acknowledgement. If so, go to step 112 ; if not, go to step 122 .
  • Step 112 retain and not discard positively acknowledged PDUs with SNs larger than VT(A).
  • Step 114 mark the positively acknowledged PDUs with SNs larger than VT(A) as positively acknowledged.
  • Step 116 detect whether reconfiguration of the receiving window size had been triggered. If so, go to step 118 ; if not, go to step 122 .
  • Step 118 update VT(MS).
  • Step 120 mark PDUs with SNs larger than or equal to VT(MS) as not yet acknowledged.
  • Step 122 end.
  • the transmitter receives a status report unit from the receiver, first update an SN following an SN of a last in-sequence acknowledged PDU and an SN of a first PDU that is outside a transmitting window, meaning the variables VT(A) and VT(MS). Then detect whether the receiver has a negatively acknowledged PDU according to the status report unit. If so, a retransmission procedure is initiated to retransmit PDUs that are negatively acknowledged. Next, detect whether the receiver has a positively acknowledged PDU. If so, retain and not discard positively acknowledged PDUs with SNs larger than VT(A) in a buffer of the transmitter, and mark the PDUs as positively acknowledged.
  • VT(MS) If reconfiguration of the receiving window size of the receiver has been triggered, then update VT(MS) first accordingly, and mark PDUs with SNs larger than or equal to VT(MS) as not yet acknowledged so that the PDUs with SNs larger than or equal to VT(MS) are not discarded. After the reconfiguration of the receiving window size has been triggered, the PDUs with SNs larger than or equal to VT(MS) are marked as not yet acknowledged. Therefore, the transmitter will not discard the PDUs with SNs larger than or equal to VT(MS), and hence the transmitter can cope with a possible request of retransmitting the PDUs and avoid initiating unnecessary reset procedures.
  • PDUs outside the receiving window are discarded by the receiver.
  • the transmitter marks the PDUs outside the transmitting window as not yet acknowledged and does not discard them from the buffer.
  • the receiver requests retransmission of the PDUs later with a status report unit, the transmitter does not determine that the status report unit comprises erroneous SNs so that the system does not initiate an unnecessary reset procedure. Consequently, the system can maintain a normal transmission.
  • transmission efficiency of the present invention is better than that of the prior art.
  • the present invention provides a method of processing, in a transmitter of a communications system, reconfiguration of a receiving window size of a receiver in the communications system.
  • the receiver discards positively acknowledged PDUs that are outside the reconfigured receiving window
  • the transmitter does not discard the PDUs outside the transmitting window. Unnecessary reset procedures are avoided so that the system can maintain a normal transmission and increase transmission efficiency. Therefore, the prior art problem of initiating an unnecessary reset procedure is solved.
  • the communications system described above can be the 3 rd generation mobile communications system operating in Acknowledged Mode (AM).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
US11/379,576 2005-04-29 2006-04-21 Method and Apparatus of a Procedure for Receiving Window Size Reconfiguration in a Communication System Abandoned US20060245430A1 (en)

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US11/379,576 US20060245430A1 (en) 2005-04-29 2006-04-21 Method and Apparatus of a Procedure for Receiving Window Size Reconfiguration in a Communication System

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US11/379,576 Abandoned US20060245430A1 (en) 2005-04-29 2006-04-21 Method and Apparatus of a Procedure for Receiving Window Size Reconfiguration in a Communication System
US11/380,654 Active 2028-05-19 US8134993B2 (en) 2005-04-29 2006-04-28 Method and apparatus for polling transmission status in a wireless communication system
US11/380,420 Abandoned US20070250637A1 (en) 2005-04-29 2006-05-24 Method and Apparatus for Reducing Jitter in a Receiver of a Selective Combining System

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US11/380,654 Active 2028-05-19 US8134993B2 (en) 2005-04-29 2006-04-28 Method and apparatus for polling transmission status in a wireless communication system
US11/380,420 Abandoned US20070250637A1 (en) 2005-04-29 2006-05-24 Method and Apparatus for Reducing Jitter in a Receiver of a Selective Combining System

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US (3) US20060245430A1 (zh)
EP (2) EP1718016A2 (zh)
JP (2) JP2006311543A (zh)
KR (2) KR100779753B1 (zh)
CN (2) CN1855887A (zh)
AT (1) ATE459170T1 (zh)
DE (1) DE602006012393D1 (zh)
ES (1) ES2340602T5 (zh)
TW (3) TW200638711A (zh)

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