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What is the relationship between t-Reordering timer and Status prohibit timer in RLC?

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What is the relationship between t-Reordering timer and Status prohibit timer in RLC?
posted Jul 9, 2014 by anonymous

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1 Answer

+1 vote

This parameter has an impact on status reporting in AM.

A low frequency of status reporting results in a low frequency of status report scheduling but a high probability that the send window size changes to 0 (means throughput stops until current window retransmission finished), thereby reducing the transmission rate and UE throughput. A high frequency of status reporting results in a high probability of timely acknowledgment to data in the send window and therefore a high probability of rate guarantee. However, a high frequency of status reporting results in a high probability of status report scheduling and repeated transmissions, thereby wasting resources.

t-Reordering timer and Status prohibit timer in RLC should be the same value, otherwise:
- if t-Reordering timer > Status prohibit timer --> some PDUs will be retransmitted from transmitter side since the re-ordering not finished at receiver side.
- if t-Reordering timer < Status prohibit timer --> some PDUs need to be retransmitted from transmitter side but delayed due status prohibit report not delivered in time from receiver side.

hope this help: Mahmoud Ali

answer Apr 19, 2016 by anonymous
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+3 votes

Please explain what is CT timer and its usage. Any example would be a great help.

+2 votes

For E.g

RLC polled the status PDU to receiver (polled till seq No . 16 ) and transmits the other sequence PDU (Seq No 17 ..).

But receiver didnt respond the polling PDU , Now transmitter wants to transmit polling PDU again. In this case will transmitter include Polling of Sequence no.16 or the latest sequence number sent after last polling.

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