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What is T304 Timer (4G & 5G)?

What is T304 Timer? and How does the UE detect a Radio Link Failure based on this timer configuration ❓

T304 Governs RRC Reconfiguration Procedure for the HO, Simply means that If the UE does not complete the handover before this timer expires, the UE reverts back to the associated configuration and initiates an RRC connection reestablishment procedure.
The T304 Timer is specified using a value of 50. 100, 150. 200, 500. 1000 or 2000 ms.
The UE starts this Timer upon receiving the RRC Reconfiguration message for the mobility control information. “MobilityControlinfo”
If T304 expires before the UE MAC successfully completes the random-access procedure on the target cell.
The UE initiates the RRC Connection Reestablishment if the timer expired before the UE completed the HO.

From: RRC Configuration “MobilityControlInfo” in 5G SA & 4G

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5G NR SSB Deep Dive: Cell Search, Beam Sweeping, Power & Optimization | بالعربي

5G NR SSB Deep Dive: Cell Search, Beam Sweeping, Power & Optimization | بالعربي

في الحلقة دي من سلسلة 5G بالعربي، هنبدأ Deep Dive عملي ومفصل في 5G NR Synchronization Signal Block (SSB)، من الـ fundamentals لحد الـ practical impact على coverage, accessibility, beam management and optimization. هنبدأ الأول بفهم الفرق بين 4G and 5G Synchronization Signals، وإزاي طريقة إرسال الـ synchronization signals اتغيرت

LTE Attach Procedure | E2E Call Flow, MME, EPS Bearer & Default Bearer | 4G E2E Signaling Session 5

LTE Attach Procedure | E2E Call Flow, MME, EPS Bearer & Default Bearer | 4G E2E Signaling Session 5

Session 5 of my 4G/LTE E2E Signaling series is out: the LTE Attach Procedure. Attach is the first thing a phone does on an LTE network. It registers, gets authenticated, receives an IP address and sets up the Default EPS Bearer. In this session: → Attach Functions & Triggering Conditions

RACH CBRA/CFRA Call Flow and Use Cases

RACH CBRA/CFRA Call Flow and Use Cases

Overview The Random Access procedure can be initiated in different situations depending on whether the network already knows the UE and whether dedicated resources can be assigned. Random Access Channel, or RACH, is used whenever the UE needs to establish or recover uplink synchronization with the network. In 5G, Random

4G LTE Cell Selection Explained: Initial Selection, Stored Information and Cell Selection Criteria

4G LTE Cell Selection Explained: Initial Selection, Stored Information and Cell Selection Criteria

Introduction After the UE completes system information acquisition, the next step is to determine whether the detected cell is suitable for camping. This process is called cell selection. During cell selection, the UE checks the available LTE cells and evaluates whether a cell satisfies the required coverage, quality, and access

Mohamed ELAdawi

Mohamed ELAdawi Telecom Expert | 5G & 6G Trainer