LTE

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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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OFDMA Parameter for LTE

How Many OFDMA Parameter for LTE? Which is OFDMA Parameter for LTE ? The width of a Sub-carrier is 15 kHz whatever the bandwidth The bandwidths are: 1.4, 3, 5,...
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SC-FDMA Receiver Benefits in LTE

DFT spreading of modulation symbols reduces PAPR In OFDM, each modulation symbols “sees” a single 15 kHz subcarrier (flat channel) In SC-FD-A, each modulation symbol “sees” a wider bandwidth (i.e....
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Difference between DL and UL in LTE

what is main Difference between DL and UL in LTE ? OFDMA Advantages Robust against narrow-band co-channel interference Robust against Intersymbol interference (ISI) and fading High spectral efficiency Efficient implementation...
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