Lte Signaling And Procedure

The statement is true because in a cellular network, each user equipment (UE) is assigned a unique identifier called C-RNTI (Cell Radio Network Temporary Identifier) within a particular cell. This identifier is used to distinguish and establish communication with the UE within the cell. Since each UE can only be associated with one cell at a time, it follows that it can only have one C-RNTI per cell. Therefore, the given statement is correct.

During an Intra-E-UTRAN Handover, the interruption time starts when the UE (or eNB) receives/sends the RRC Connection Reconfiguration: Handover command, which initiates the handover process. The interruption time ends when the UE (or eNB) receives/sends the RRC Connection Reconfiguration Complete: Handover Confirm, indicating that the handover has been successfully completed. This interruption time represents the duration during which the UE is temporarily disconnected from the network while transitioning from one eNB to another.

If there are 4 services with 3 different Quality of Services (QoS), it means that each service requires a specific level of performance. Since there are 3 different QoSs, it implies that each QoS needs to be configured for at least one service. Therefore, a total of 3 E-RABs (Evolved Radio Access Bearers) need to be configured to meet the QoS requirements of the 4 services.

TAU (Tracking Area Update) is a procedure in LTE networks that allows a mobile device to update its location information when moving to a different tracking area. Intra-E-UTRAN handover refers to a handover within the LTE radio access network. The given statement suggests that TAU will be processed every time after an intra-E-UTRAN handover, which is incorrect. TAU is not necessary after every intra-E-UTRAN handover as the handover process itself updates the location information of the mobile device. Therefore, the correct answer is false.

This statement is true because a single RB (Radio Bearer) in a telecommunications network can be allocated and shared among multiple services. This allows for efficient utilization of network resources and enables multiple users or applications to transmit and receive data simultaneously using the same RB. Sharing RBs helps to optimize network capacity and improve overall network performance.

During X2 intra-E-TRAN handover, the handover flow is not performed per each E-RAB. Instead, it is performed for all the E-RABs simultaneously. This means that if there are many E-RABs for a UE, they will be established together in a single handover procedure, rather than separately. Therefore, the correct answer is False.

The correct answer is 4, 1 and Default Bearer 1,2,3,4 + Dedicated Bearer 1,2. This means that there are 4 APN-AMBRs defined and 1 UE-AMBR defined. The UE-AMBR includes the Default Bearer 1,2,3,4 and the Dedicated Bearer 1,2.

In this scenario, the UE has 5 different QoS services. Out of these 5 services, 2 are provided by 2 different APNs. Each APN requires a default EPS bearer, so there will be a total of 2 default EPS bearers. The remaining 3 QoS services will be provided by dedicated EPS bearers, resulting in a total of 3 dedicated EPS bearers. Therefore, the correct answer is 2 default EPS bearers and 3 dedicated EPS bearers.

PCI and ECI are not both cell IDs used for the same purpose. PCI (Physical Cell Identity) is a unique identifier assigned to each cell in a cellular network, while ECI (E-UTRAN Cell Identity) is a unique identifier assigned to each cell in an LTE (Long-Term Evolution) network. Although they serve similar purposes in identifying cells, they are specific to different network technologies. Therefore, the statement that PCI and ECI are used for the same purpose is false.

During the random access procedure, a C-RNTI (Cell Radio Network Temporary Identifier) is not assigned for contention resolution. Instead, a temporary identifier called a T-CRNTI (Temporary Cell Radio Network Temporary Identifier) is used for this purpose. The C-RNTI is assigned after the random access procedure is successfully completed and is used for ongoing communication with the base station. Therefore, the given statement is false.

The statement is false because SI-RNTI is not used to find the resource allocated in PDSCH. SI-RNTI is used to decode the System Information Blocks (SIBs) in the Physical Downlink Shared Channel (PDSCH). The resource allocation in PDSCH is determined by the DCI (Downlink Control Information) message received on the Physical Downlink Control Channel (PDCCH). The SI-RNTI is used during the random access procedure to assign temporary identifiers to the User Equipment (UE), but it is not used to find the resource allocation in PDSCH.

The correct answer is PCFICH > PDCCH > (DL-SCH > PDSCH). This is because the UE needs to read the Physical Control Format Indicator Channel (PCFICH) first, which provides information about the number of OFDM symbols used for the PDCCH. Then, the UE reads the Physical Downlink Control Channel (PDCCH), which contains control information for the UE. Finally, the UE reads the Downlink Shared Channel (DL-SCH) and Physical Downlink Shared Channel (PDSCH) which carry the actual data.

When losing timing advance, the UL (Uplink) becomes out of synchronization. In this situation, the UE (User Equipment) is unable to transmit data unless it performs either contention based random access or non-contention based random access. These procedures allow the UE to regain synchronization and resume transmitting data. RRC connection establishment and attach are not directly related to resolving the issue of UL synchronization loss.

The correct answer is (MO signaling : Attach), (MT Access : Service Request), (MO data : TAU). This is because during initial attaching, the UE sends an RRC Connection Request with the cause being MO signaling (Attach). After the RRC connection is established, the network sends an MT Access message to the UE, causing the RRC Connection Complete message to have the cause MT Access (Service Request). Finally, the UE sends a Service Request message to the network for MO data, causing the RRC Connection Complete message to have the cause MO data (TAU).

After random access and RRC connection establishment, C-RNTI will be assigned to a UE. However, the C-RNTI is not used for the UE to read PDCCH in order to receive data in PDSCH only. The PDCCH (Physical Downlink Control Channel) carries control information for the UE, including information about the resources allocated for the PDSCH (Physical Downlink Shared Channel). The UE uses the RNTI (Radio Network Temporary Identifier) assigned to it to decode the PDCCH and receive the necessary control information. Therefore, the statement is false.

The statement is false because the GUTI (Globally Unique Temporary Identifier) can be changed even without the UE (User Equipment) detaching and attaching back again. The GUTI can be updated during the attach procedure itself if there is a need for a new GUTI to be assigned. Therefore, the GUTI is not necessarily fixed and can be changed during the attach procedure.

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The given statement is false. C-RNTI (Cell Radio Network Temporary Identifier) is not assigned during random access and RRC connection establishment. Instead, it is assigned during the initial connection setup procedure, which includes RRC connection establishment. Once assigned, C-RNTI remains the same as long as the UE stays in connected mode.

The given statement is false. After receiving a response from RA (Random Access), the following signal is not always 'RRC Connection Request'. It can be any other signal depending on the specific network protocol and the actions taken by the network. Therefore, the correct answer is false.

After the Modify Bearer Request, the whole new EPS Bearer path can be used for both UL/DL. This means that the UE (User Equipment) can start using the new EPS (Evolved Packet System) Bearer path for both uplink (UL) and downlink (DL) data transmission. The Modify Bearer Request is a signaling message sent by the network to the UE to modify the characteristics of a bearer, such as QoS parameters. Once this request is completed, the UE can fully utilize the new EPS Bearer path for both UL and DL traffic.