How Many Logical Channel in LTE ?

The following control logical channels have been defined by the 3GPP: BCCH, Broadcast Control Channel, used for the transmission of system control information. A UE needs to decode it before requesting a connection. PCCH, Paging Control Channel, is a downlink channel that transfers paging information and system information change notifications. This channel is used for […]

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How Channel Architecture in LTE?

A Logical Channel is defined by the type of information it carries. Logical channels are classified into control and traffic channels. Answer to the question: what is it being transported? A Transport Channel is defined by how and with what characteristics the information is transmitted. Answer to the question: how is it being transported? A […]

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How Channel Architecture in LTE?, physical, channel, information, transported, logical

How MAC Protocol Work In LTE?

The MAC protocol provides the following services: Logical Channel to Transport channel mapping Scheduling: There is no dedicated channel allocated to a UE. Time and frequency resources are dynamically shared between the users in DL and UL. The scheduler is part of the MAC layer and controls the assignment of uplink and downlink resources. Multiplexing/Demultiplexing […]

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How MAC Protocol Work In LTE?, channel, scheduler, shared, ue, resources, enodeb

Radio Link Control (RLC) protocol services in LTE

The Radio Link Control (RLC) protocol provides the following services: Segmentation of SDU according to the size Re-Segmentation of PDU Radio Bearer to logical channel mapping Transfer of data in 3 modes: TM Transparent Mode Without retransmission. For real-time service. UM Unacknowledged Mode Without retransmission, but error statistics (BLER) It can be used for the […]

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Radio Link Control (RLC) protocol services in LTE, data transfer, upper layer, Radio Link Control (RLC) protocol, LTE Basic, segmentation, retransmission

State of RRC in LTE

RRC uses the following states: RRC_Idle: •The UE is not connected. There is no radio link. •The network knows that the UE is present on the network and is able to reach it in case of incoming call. •The UE switches in idle mode when it is connected and there is no traffic to save […]

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State of RRC in LTE, network can transmit receive, traffic to save radio, e utran rrc connection

Establishment and Maintenance of the RRC connection in LTE

The establishment and maintenance of the RRC connection includes:  Allocation of temporary identifiers between UE and E-UTRAN.  Configuration of signaling radio bearer(s) for RRC connection.  Low priority SRB and high priority SRB.  Security functions including key management.  Establishment, configuration, maintenance and release of point to point Radio Bearers  The Mobility management functions includes:  UE measurement […]

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Establishment and Maintenance of the RRC connection in LTE, rrc connection, selection, reselection, radio, priority, mobility

Radio Resource Connection (RRC) protocol in LTE

The Radio Resource Connection (RRC) protocol is implemented in the eNodeB and the UE. In WCDMA, it is implemented in the RNC! RRC is the highest protocol in the control plane on the radio side. The RRC protocol allows: 2 instances (eNodeB and UE) to exchange signaling messages. to forward signaling messages coming from the […]

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Radio Resource Connection (RRC) protocol in LTE, system information related, stratum, signaling messages, access stratum

Radio Protocol Stack Overview in LTE

In the C-plane, the NAS functional block is used for network attachment, authentication, setting up bearers, and mobility management. All NAS messages are ciphered and integrity protected by the MMEand UE. The radio resource control (RRC) layer in the eNB makes handover decisions based on neighbor cell measurements reported by the UE, performs paging of […]

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Radio Protocol Stack Overview in LTE, LTE Funda on Protocol, LTE Traffic and Stack

Resource Element Group in LTE

For the control channel, the radio signaling, the Resource Block is not the adapted unit. The control channels mapped on the Resource Elements Groups (REGs), which represent less radio resources A REG is made up of 4 (or 6 if there are pilot sub-carriers) sub-carriers during 1 symbol. The REG are grouped into the CCE […]

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Resource Element Group in LTE, LTE Basic funda, LTE Basic Resource elemant

Resource Block & Physical Resource Block in LTE

Resource Block Multiplex multiple users both in time and frequency, together with pilots and control signals. The time-frequency plane is divided into chunks=minimum resource allocation unit. The traffic multiplexing is performed by allocating to each user a certain number of chunks depending on its data rate/geometry. Physical Resource Block In OFDMA, users are allocated a […]

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time and frequency, physical resource, resource block, frequency, allocation

How LTE TDD Subframe Allocations?

One of the advantages of using LTE TDD is that it is possible to dynamically change the up and downlink balance and characteristics to meet the load conditions. In order that this can be achieved in an ordered fashion, a total of seven up / downlink configurations have been set within the LTE standards, in […]

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LTE TDD subframe allocation, lte basic funda for subframe, subframe, downlink, transmission

How is Basic Frame Structure in LTE ?

In FDD, the DL and UL Radio Frames (RFs) are not on the same carrier. The RF frame is called Type 1 by the 3GPP. The RF length is 10 ms. The radio frame is made up of 10 sub-frames of 1 ms. Each sub-frame is made up of 2 slots of 0.5ms. For FDD, […]

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lte frame structure, lte basic, Structure, subframes, frames, lte

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