What is hyper frame number?
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In 2G/3G/4G radio access systems the HFN is used between the base station and the mobile to limit the number of bits used for sequencing over the radio interface. The number may also be used as part of the security process.
What is hyper frame number in LTE?
To support this kind of new requirement, LTE has introduced another timer(clock) called HFN (Hyper Frame Number or Hyper SFN). HFN is a timer at the next level to SFN. HFN ranges between 0 and 1023 and the value increases by 1 when SFN reaches 1023 and reset to 0.
What is System frame number in 5G?
Similar to LTE, 5G NR also have System Frame Number (SFN) 0 to 1023 and requires 10 bits to represent SFN. the 6 bits for SFN can be obtained from MIB and remain 4 bits are derived from PBCH payload.
What is SFN in MIB?
The MIB contains DL bandwidth of the cell, PHICH configuration and the System Frame Number (SFN) IEs in the MASTER INFORMATION BLOCK message. dl-Bandwidth: Transmission bandwidth configuration, nRB in downlink. The value n6 corresponds to 6 resource blocks, n15 to 15 resource blocks and so on.
What is PSS and SSS in LTE?
In LTE, there are two downlink synchronization signals which are used by the UE to obtain the cell identity and frame timing. Primary synchronization signal (PSS) Secondary synchronization signal (SSS)
What is SIB1 in LTE?
SystemInformationBlockType1 (SIB1) contains information relevant when evaluating if a UE is allowed to access a cell. Also, it supplies the UE with the scheduling of other system information.
What is SSB index in 5G?
SS Block(SSB) stands for Synchronization Signal Block and in reality it refers to Synchronization/PBCH block because Synchnronization signal and PBCH channel are packed as a single block that always moves together.
Why SSS is placed before PSS?
SSS helps to achieve radio frame synchronization and deduce a pointer towards 1 of 168 Physical layer Cell Identity (PCI) groups. Below diagram shows how PSS and SSS helps finding the Physical Layer Cell ID.
Why SSS is before PSS in LTE?
Secondary Synchronization Signal (SSS) After the mobile has found the 5 ms timing, the second step is to obtain the radio frame timing and the cells’ group identity. This information can be found from the SSS. In the xtime domain, the SSS is transmitted in the symbol before the PSS .
What is RRC in LTE?
The Radio Resource Control (RRC) protocol is used in UMTS, LTE and 5G on the Air interface. It is a layer 3 (Network Layer) protocol used between UE and Base Station.
What are UMTS frequency bands?
UMTS frequency bands are spectrum allocations dedicated to use for 3G Universal Mobile Telecommunications System networks. Bands are harmonised internationally via the 3GPP 25.101 standard.
What is a GSM hyperframe?
It is the largest time interval within the GSM frame structure. Within the GSM hyperframe there is a counter and every time slot has a unique sequential number comprising the frame number and time slot number. This is used to maintain synchronisation of the different scheduled operations with the GSM frame structure.
How many bursts are used in a traffic multiframe?
In a traffic multiframe, 24 bursts are used for traffic. These are numbered 0 to 11 and 13 to 24. One of the remaining bursts is then used to accommodate the SACCH, the remaining frame remaining free. The actual position used alternates between position 12 and 25.
What is frequency hopping in GSM?
Frequency hopping: Frequency hopping is a feature that is optional within the GSM system. It can help reduce interference and fading issues, but for it to work, the transmitter and receiver must be synchronised so they hop to the same frequencies at the same time.