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Version 4 (modified by Nilanjan Paul, 9 years ago) ( diff )

ARQ Control

Automatic Repeat reQuest is the MAC level data connection's error control mechanism.


ACK proc time.


ARQ block lifetime. This is the maximum time interval an ARQ block shall be managed by te transmitter ARQ state machine, once initial transmission of the block has occurred. If transmission (or subsequent retransmission) of the block is not acknowledged by the receiver before the time limit is reach, the block is discarded.


Tx ACK delay. This is the time delay before receiver sends of an acknowledgement. Default: 100.


Sync loss timeout. This is the maximum time interval ARQ_TX_WINDOW_START or ARQ_RX WINDOW_START parameters can stay at the same value before declaring a loss of synchronization between transmitter and receiver.


Deliver in order on/off. This option tells received to forward SDUs in same order as sent by transmitter. Default: on


Transmission window size. This is the number of queued ARQ acknowledgement blocks at any given time for a connection. Default: 1024


RX purge timeout. This is the time interval the receiver shall wait after successful reception of a block that does not result in advancement of ARQ_RX_WINDOW_START value, before advancing to a new ARQ_RX_WINDOW_START.


Indicates if ARQ is enabled for connection. Default: false


TX retry timeout. The minimum time interval a transmitter shall wait before retransmission of an unacknowledged block for retransmission. The interval begins when the ARQ block was last transmitted.


ARQ block size in bytes. Before transmission each SDU block is partitioned into a sequence of ARQ blocks of this size. Default: 1024


RX retry timeout.


1) 2) 3) Performance Analysis of the IEEE 802.16 ARQ Mechanism. Sayenko, Tykhomyrov, Martikainen, Alanen.

<service name="arq">
  <info>Set ARQ parameters</info>
    <arg name="ackproctime" isRequired="false" value="[ackproctime]">
      <info>ACK proc time [] (0)</info>
    <arg name="blockltm" isRequired="false" value="[blockltm]">
      <info>ARQ block lifetime [] (5000)</info>
    <arg name="txackdelay" isRequired="false" value="[txackdelay]">
      <info>Tx ACK delay [] (100)</info>
    <arg name="sltmo" isRequired="false" value="[sltmo]">
      <info>Sync loss timeout [] (10000)</info>
    <arg name="dlvrorder" isRequired="false" value="[dlvrorder]">
      <info>Delivery in order: true/false (true)</info>
    <arg name="wsize" isRequired="false" value="[wsize]">
      <info>ARQ window size [0..1024] (1024)</info>
    <arg name="rxpurgetmo" isRequired="false" value="[rxpurgetmo]">
      <info>RX purge timeout [] (5000)</info>
    <arg name="enable" isRequired="false" value="[enable]">
      <info>Enable ARQ: true/false (false)</info>
    <arg name="rtmotx" isRequired="false" value="[rtmotx]">
      <info>TX retry timeout [] (1000)</info>
    <arg name="bloksize" isRequired="false" value="[blocksize]">
      <info>ARQ block size [0..(ARQ windows size/2)] (256)</info>
    <arg name="rtmorx" isRequired="false" value="[rtmorx]">
      <info>RX retry timeout [] (1000)</info>
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