What are logical channels in LTE?
A logical channel is defined by the type of information it carries and is generally classified as a control channel, used for transmission of control and configuration information necessary for operating an LTE system, or as a traffic channel, used for the user data.
What is logical channel in GSM?
In GSM logical channels (see Figure 7.4) are used to carry traffic and control information. There are three types of logical channels: traffic channels (TCHs), control channels (CCHs), and the cell broadcast channel (CBCH). The traffic channels are used to transmit user information (speech or data).
What is the difference between physical and logical channels?
The Physical channels are determined by the timeslot, whereas the logical channels are determined by the information carried within the physical channel. These channels may either be used for user data (payload) or signalling to enable the system to operate correctly.
What logical channels are carried by Pdcch and Pucch physical channels?
The PBCH transmissions has 14 information bits, 10 spare bits, and 16 CRC bits. Physical Control Format Indicator Channel (PCFICH) : As the name implies the PCFICH informs the UE about the format of the signal being received. It indicates the number of OFDM symbols used for the PDCCHs, whether 1, 2, or 3.
Why are so many logical channels used in GSM?
GSM needs to transmit a large amount of signalling information apart from the payload data. These different types of data are transmitted via several logical channels. The name stems from the fact that each of the data types is transmitted on specific timeslots that are parts of physical channels.
What is an LTE logical channel?
A logical channel is defined by the type of information it carries and is generally classified as a control channel, used for transmission of control and configuration information necessary for operating an LTE system, or as a traffic channel, used for the user data.
What are the logical channels in 3GPP?
In 3GPP specifications, several types of data transfer services are offered by MAC. Each logical channel type is defined by the type of information that it transfers. Logical channels can be classified into two general groups: Control Channels: Control channels are used for the transfer of control plane information only.
What are the types of logical channels?
Each logical channel type is defined by the type of information that it transfers. Logical channels can be classified into two general groups: Control Channels: Control channels are used for the transfer of control plane information only. The control channels offered by MAC are: A downlink channel for broadcasting system control information.
How many control channels are there in LTE?
In LTE we have 7 logical channel in Downlink and 3 Logical channels in Uplink Control channel: In Downlink there are 4 Control channel which carried Common channel information as well as dedicated channel information Dedicated Control Channel (DCCH) – It used to transmit dedicated control information for a particular UE