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LTE: What is the use of polling at RLC layer ?

+9 votes
LTE: What is the use of polling at RLC layer ?
posted Dec 3, 2013 by Vimal Kumar Mishra

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2 Answers

+2 votes

An AM RLC entity can poll its peer AM RLC entity in order to trigger STATUS reporting at the peer AM RLC entity for the transmitted RLC AMD PDU.

answer Dec 3, 2013 by Harshita
+1 vote

The transmitting side of the AM RLC entity can proactively request a status report from the peer receiving side by polling using a 1-bit indicator in the AM RLC header. The transmitting side can then use the status reports to select the RLC Data PDUs to be re-transmitted, and manage transmission and re-transmission buffers efficiently.

Typical circumstances in which the transmitting side may initiate a poll include, for example, the last PDU in the transmitting side having been transmitted, or a predefined number of PDUs or data bytes having been transmitted.

When the receiving side of the AM RLC entity receives a poll from the peer transmitting side, it checks the reception buffer status and transmits a status report at the earliest transmission opportunity.

answer Dec 24, 2014 by Pavankumar Survepalli
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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.