What is contention resolution in LTE?

The Contention Resolution phase helps uniquely identify the UE that has been selected. In this scenario, contention resolution will resolve the random access procedure between UE-A and UE-B. Pick Initial UE Identity as ‘Random.

What is contention resolution timer in LTE?

The timer which states the number of consecutive subframe/subframes during which MAC entity will monitor the PDCCH after the Msg3 is transmitted. ( 3GPP TS 36.321 version 13.3.0 Release 13) The UE will start mac-Contention resolution timer from the immediate subframe after transmitting Msg3.

What is backoff indicator in LTE?

Backoff Indicator is a special MAC subheader that carries the parameter indicating the time delay between a PRACH and the next PRACH. … The parameter that controls this is called the backoff indicator (BI) and is signaled by the eNB in the random access response.

What is contention based and contention free?

MAC protocol such as contention-free or contention-based MAC protocols can be used to avoid a collision. In contention-based MAC protocols, the acquired channel mostly uses control packets. Mostly used for transmission in the independent traffic pattern. Contention-free MAC is used for the dependent network.

What is RRC LTE?

The RRC protocol is the signaling exchanged between the mobile and the evolved Node Base station (eNB) over the LTE-Uu radio interface. The RRC protocol performs the following functions: … Broadcast of system information related to the characteristics of the radio interface.

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What is RAR in 5G?

A 5G UE picks a random preamble for RACH procedure to get the uplink synchronisation. … Random Access RNTI (RA-RNTI) is used during Random Access procedure, the gNB’s MAC generates Random Access Response (RAR) as a response to the Random Access Preamble transmitted by the UE.

What is contention based random access procedure?

In the contention based random access procedure, there is a possibility of collision since the UEs use a random access preamble randomly selected from a plurality of candidate random access preambles. Contention resolution is required when contention occurs in the contention-based random access procedure.

What is PrachCS?

PrachCS and rootSeqIndex Formats 0, 1 and 2 • PrachCS defines the number of cyclic shifts (in terms of number of samples) used to generate multiple preamble sequences from a single root sequence • Example based on PrachCS=12 -> number of cyclic shifts: 119 – Root sequence length is 839 so a cyclic shift of 119 samples …

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