Medium Access Control (MAC) protocol specification written in (3GPP TS 38.321). MAC is a protocol layer above the physical layer and below the RLC layer. The ‘Medium Access Control’ (MAC) layer receives both the user plane and control plane data from the set of logical channels provided by the RLC layer. Multiplexes and…
N26 interface is an inter-CN interface between the MME and 5GS AMF in order to enable interworking between EPC and the NG core. Support of the N26 interface in the network is optional for interworking. N26 supports a subset of the functionalities (essential for interworking) that are supported over S10. PGW-C + SMF and…
How 5G NR initial Cell Search process work? For the initial access case (idle mode), the UE should start by the cell search procedure. By using the PSS, SSS, and specific synchronization algorithms, the UE can estimate and correct the frequency and time offsets. Cell Search The UE searches for a specific frequency based…
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After the UE has detected PSS and acquired symbol timing and initial frequency synchronization, it detects SSS which carries the physical cell identity.
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LTE Downlink Channels Physical Downlink Shared Channel (PDSCH) Carries the DL-SCH and PCH. DL-SCH contains actual user data. Physical Downlink Control Channel (PDCCH) Informs the UE about the resource allocation of PCH and DL-SCH, and HARQ information related to DL-SCH. Carries the uplink scheduling grant. Physical HARQ Indicator Channel (PHICH) Carries ACK/NACKs in response to…
First we have to understand what is SIP ? In an IMS network, Session Initiation Protocol (SIP) messages are exchanged between UEs using signaling PDP contexts through the PS domain of the LTEnetwork. Similarly, media streams (voice/video) are transmitted using media PDP contexts. Like common interactive PDP contexts, media PDP contexts do not require special…
VOLTE: VOICE OVER LTE VoIP call support over an LTE network requires IMS support. When a UE with an active VoIP call leaves LTE coverage to an area with only 1xRTT coverage, the call can be seamlessly handed over from the LTE-IMS to the 1xRTT CS domain. Call continuity from IMS to the CS domain…
SS/PBCH Time domain Resource Allocation SSB Burst set : All SSBs are transmitted within 5 ms. Maxmimum SSB in Cell is depend upon frequency. Less than 3 GHz band maximum SSB is 4 3 GHz to 6 GHz maximum SSB is 8 greater than 6 GHz maximum SSB is 64. SS Block Periodicity : SSB…