5G • RAN
t-PollRetransmit
RLC Poll Retransmit Timer
Timer supervising polling bit responses; upon expiry, the transmitter re-sends the poll to prevent stall.
Technical Explanation
When an RLC AM entity transmits an RLC PDU with the poll bit P=1, it starts t-PollRetransmit. If the timer expires before an RLC Status PDU is received (e.g. because the polled PDU or the response was dropped), the transmitter re-sends the poll bit on the newest PDU, preventing the transmitter window from stalling.
Key Functions
- Supervises reception of RLC Status PDU following a poll request
- Prevents transmitter window stalling when control feedback is lost
- Restarts polling retransmission up to maxRetxThreshold
Specifications
3GPP TS 38.322
Interfaces
Uu
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