What are the RNC functions to control radio resource connection (RRC) that require an active bearer (e.g. connection-based functions)?

Handover Control, Micro Diversity

These are used to manage the amounf of power being transmitted and the number of subscribers in a cell. This control is important when introducing new bearer allocations into the network

Load Control and Admission Control

Load Control and Packet Scheduler

Resource Manager and Power Control

Transmission/Reception functions of the physical layer include: - mapping to physical channels - spreading, - modulation - power amplification and...

Channel coding and interleaving

Multiplexing of transport channels

Channel coding and interleaving

Multiplexing of transport channels

The followgin are RRC layer controls the following EXCEPT:

Mapping of the different channel types

Measurement and other Mobility procedures

Which of the following is a functions of RLC?

Selection of common or dedicated channels

Selection of data to be inserted in the radio frame

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Take The Trivia Questions Quiz On Radio Resource Management!

This interface enables the RNC to maintain Radio Resource Management (RRM) independently.

Wideband switching in the RNC makes the element structure of RNC remarkably different to element structure of BSC in GSM BSS during implementation.

What are the RNC functions to control radio resource connection (RRC) that require an active bearer (e.g. connection-based functions)?

These are used to manage the amounf of power being transmitted and the number of subscribers in a cell. This control is important when introducing new bearer allocations into the network

Which RNC function is responsible for allocation of bearer?

The main RRC states are detached, idle and connected.

From the UE to the network connection point of view, the RRC changes its state from idle to connected.

For any user exchange of user data and signaling between the UE and the network, the RRC-connected state can be considered a prerequisite.

When there is no RRC connection between the mobile and the network, but the mobile is switched on, the mobile is considered to be in _____ mode. It means that the mobile is listening to one base station and is in readiness to start a connection, or is waiting to be paged.

In this RRC mode/state, a dedicated channel is provided to the subscriber. In this state, the UE is sending measurement reports to the network, which enables the system to control the dedicated bearer and perform handovers.

In this RRC mode, the mobile is only sending small pieces of information to the network, for example irregular Internet-based traffic or for signaling. The network does not perform handovers as the mobile moves from one cell to another. The UE just informs the network about its current location

In this RRC mode, the network bearer is not being used for a long time but the mobile is still known to a cell level. In this state, the UE is using a Diagnostics Repetition Function (DRX) to save battery. No handover is needed when the mobile moves from one cell to another.

In this RRC mode, a handover is needed when the mobile moves from one cell to another.

In this URA_DCH RRC mode, the mobile is not being used for a long time but the mobile is known on the RNC level only.

RRC as an entity is composed of two items, Medium Access Control (MAC) and Radio Link Control (RLC). Together these two are also called as Layer 3 processing.

Transmission/Reception functions of the physical layer include: - mapping to physical channels - spreading, - modulation - power amplification and...

A frequency and a code characterize a physical layer.

The MAC layer performs scheduling and mapping of logical channel data onto the transport channels provided by the physical layer.

For common transport channels, the MAC layer adds addressing information to distinguish data flows intended for different handsets.

In GSM, there is a possibility to dynamically switch one logical channel (data flow) onto different transport channel types, based on the activity of the subscriber.

The Radio Link Control protocol operates in one of three modes: transparent, unacknowledged, or acknowledged mode. It performs segmentation/reassembly functions and, in unacknowledged mode, provides an assured mode delivery service by used of retransmission.

RLC provides service for RRC signaling to the Radio Access Bearer and for the user data transfer, the Signaling Radio Bearer.

The followgin are RRC layer controls the following EXCEPT:

Ciphering of non-real time date is done by the RLC.

Which of the following is a functions of RLC?

Which of the following is a function of MAC?

When WCDMA network is planned, one of the basic criteria for planning is to define the acceptable interference level, with which the network is expected to function correctly. This planning based value and the actual signals the UE transmit set practical limits for the Uu interface capacity.

The main task of Load Control is to estimate whether a new call can have access to the system without sacrificing the bearer requirements of existing calls. Based on this, the RNC grants or rejects the access.

SIR is also called Interference Margin and has a direct relationship with the cell load.

Interference Margin = 10 * (Log(1/(1-Load_Factor))) where Load_Factor is any number from 0 to 1

When the cell load exceeds 70%, the interference in that cell will be very difficult to control.

WCDMA radio network normally dimensioned with expected capacity equivalent to Load Factor value 0.7 or 70%.

What do you call the value that represents a sensible cell load on which when the load is approaching this value, Traffic Handovers (TRHO) are performed?

Since PRX_Target defines the planned load of the cell, maximum traffic admission is done up to this level in the cell.

A second level of value known as the PRX_TARGET_BS is used by the RNC to stop situations of congestion. Once this value is reached, the RNC takes actions to reduce the load in a cell.

It is a general feature that handles scheduling radio resources for Non-Real-Time (NRT) radio access bearers for both uplink and downlink directions.

Packet scheduler makes the decision of the used channel type for the uplink direction.

In Release 3, the actions of the packet scheduler are driven by the load control function. The gap between RT traffic and the load target of the cell can be filled by the packet scheduler.

Its purpose is to optimize the capacity of a cell and prevent an overload situation to maintain the stability of the system. It consists of AC algos, PS algos and LC, which updates the load status of the cell based on resource measurements and estimations provided by AC and PS.

In terms of overload control, the Load Control function of the RNC are both preventive and corrective.

Interference is the main resource criterion for CDMA system; the following load control measures are practiced: - UL total received wideband interference power - DL total transmission power - One RNC on cell basis periodically under.

Traffic in a cell can be categorized by priority, depending on the traffic type (Conversational, Streaming, Interactive, Background). The categories can be subdivided into RT and NRT traffic.

Above Ptx_threshold or Prx_threshold, Overload control of LC and PS decreases bitrate and drops NRT bearers

Above Ptx_target + Ptx_offset, Preventive control of LC, AC does not admit new bearers, PS decreases bitrate of NRT

Above Ptx_target, No actions done by LC, AC does not admit new bearers, PS does not increase NRT load but can change bitrate

Both scrambling and channelization codes are maintained by RNC.

Spreading code by definition is the same as scrambling code X channelization code.

It means the phenomenon where the probability of the blocked branch of the code tree increases too much and thus it starts to prevent new accesses to the system

The channelization code has the same length as the base band data.

Channelization codes could change during a connection.