All posts by Azar

WHAT IS THE CONTENTION RESOLUTION (RANDOM ACCESS PHASE 4)?

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PHASE 4 By the time Random Access Phase 4 takes place Uplink synchronization is already established by the UE with eNodeB. In this phase, only a UE terminal which finds match between the identity received in the fourth step (Phase 4) and the identity transmitted as part of third step (Phase 3) will declare the […]

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WHAT IS RANDOM ACCESS PHASE 3 ?

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PHASE 3 In Phase 3 (or first scheduled UL transmission), the UE provides the network with a unique identifier in the message. It transmits on Uplink shared channel (UL-SCH) according to the grant contained in the RA Response. The type of UE identifier, e.g. C-RNTI, TMSI, IMSI or IMEI, depends on which extent the UE […]

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WHAT IS RANDOM ACCESS PROCEDURE (PHASE 1)?

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Before sending a preamble, the UE synchronize to the downlink transmissions and read the system information Broadcast control channel (BCCH). The BCCH will reveal where the random access (RA) time slots are located, which frequency bands can be used, and which preamble (sequences) are available. At the next RA slot, the UE will send the […]

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WHAT ARE THE POSSIBLE RRC STATES?

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RRC has two possible states RRC IDLE RRC CONNECTED. A UE in EPS Mobility Management (EMM) – IDLE is RRC IDLE A UE in EPS Mobility Management (EMM) – CONNECTED is RRC CONNECTED. RRC IDLE Support for Discontinous Reception (DRX) configured by NAS UE has no RRC connection UE listens to paging and broadcast system […]

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WHAT ARE THE EPS MOBILITY MANAGEMENT STATES?

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The main EPS mobility management states are shown below. EMM = EPS Mobility Management EMM-Detached In this state the location of the UE is not known by the network ( e.g., UE is powered off ) There is no EMM context in the UE. It is a null state in which the UE enters before […]

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