What is RA-Rnti in LTE?

What is RA-Rnti in LTE?

RA-RNTI (Random Access RNTI) As part of Random Access procedure, the eNB’s MAC generates Random Access Response (RAR) as a response to the Random Access Preamble transmitted by the UE. RAR is transmitted on DL-SCH transport channel which intern is mapped to PDSCH.

How is RA-Rnti calculated in LTE?

The RA-RNTI associated with the PRACH where Random Access Preamble is transmitted can be computed follows: RA-RNTI= 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id.

What is Rnti in 5G?

RNTI stands for Radio Network Temporary Identifier. RNTIs are used to differentiate/identify a connected UE in the cell, a specific radio channel, a group of UEs in case of paging, a group of UEs for which power control is issued by the eNB, system information transmitted for all the UEs by 5G gNB.

What is MCS C Rnti?

MCS-C-RNTI is an unique UE identification used for indicating an alternative MCS table for PDSCH and PUSCH. For scheduling data packets with higher reliability (e.g. URLCC), 64QAM MCS tables containing entries with lower spectral efficiency are introduced for both downlink and uplink.

What is contention resolution timer?

Contention resolution timer is to check if the eNB has sent the Contention Resolution Identity MAC CE in response to msg3 to complete the contention resolution procedure (for contention based mechanism). If no such message from eNB during this timer, then the new RACH procedure happened.

What is rap ID in LTE?

Random Access Preamble Identifier. This is used by the E-UTRA MAC layer and relates to the 6bit access preamble identifier which was initially used by a UE accessing the eNB on the PRACH. Effectively it forms part of the contention resolution procedure.

How many RSI is LTE?

The 1800 MHz frequency-band data consisted of 17634 non-conflicting cells and 10916 RSI collisions.

What is PRACH?

PRACHPhysical Random Access Channel is the Physical Random Access Channel and is used by UEs to request an uplink allocation from the base station. In the frequency domain, PRACH spans 6 resource blocks of spectrum.

What is CRC scrambling?

The scrambled CRC is obtained by performing a bit-wise XOR operation between the 16-bit calculated PDCCH CRC and the 16-bit RNTI. Different RNTI can be used to scramble the CRC. The following RNTI are some examples. A UE unique identifier; for example, a Cell-RNTI.

What is RA preamble?

There are two groups of RA-Preambles, Group A and Group B. Group A always exists and Group B exists only with the specific configuration in SIB 2 parameter. The determination of Group A and Group B is described in 36.321 5.1.

What is contention resolution?

Contention resolution is used in wireless networks, where messages must be transmitted on a shared communication channel. When two or more messages are transmitted at the same time, a collision occurs, and none of the transmissions succeed.

What is the RA preambles Group A and B What is the difference?

The preambles in Random Access Preamble group A are the preambles (0 to sizeOfRAPreamblesGroupA – 1) and, if it exists, the preambles in Random Access Preamble group B are (the preambles sizeOfRA-PreamblesGroupA to numberOfRA-Preambles – 1) from the set of 64 preambles as defined in 36.211.

What is PCI and RSI in LTE?

The tested network problems are Physical Cell Identity (PCI) conflicts and Root Sequence Index (RSI) collisions and were labeled through configured cell relations that verified these two conflicts. Furthermore, a real LTE network was used.

What is the difference between Rach and PRACH?

RACH is transport-layer channel; the corresponding physical-layer channel is PRACH.

What is PRACH resource index?

The PRACH mask index identifies which PRACH resources the UE is allowed to use for its access attempt (see 36.32, section 7.3). More specifically, the mask defines in whichPRACH (or PRACHs) within a frame a UE can transmit a Random Access Preamble.

What is CCE aggregation level?

The CCE aggregation level is given by the PDCCH format and determines the number of PDCCH candidates in a search space. The number of candidates and size of the search space for each aggregation level is given in the following table.