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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What is 5G Identifier? Identifiers play an important role in the 5G System, for example, the permanent and temporary subscriber identities are constructed to identify not only a particular subscriber, but also the network function(s) where the permanent and temporary subscriber records are stored. The network identifiers in 5G system are divided…
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…
What is Antenna Port? An antenna port is in the 3GPP specifications an abstract concept that is a logical entity rather than a physical antenna. Each antenna port is associated with a specific set of reference signals such that the channel over which a symbol is transmitted on that antenna port can be distinguished from…
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…