What are logical channels?
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.
Which channel is the logical control channel specified on the reverse link in Wcdma?
Forward Logical control channels in WCDMA: Broadcast control channel (BCCH): Downlink channel for broadcasting system controlinformation. Paging control channel (PCCH): Downlink channel that transfers paging information and isused when: Network does not know the location cell of the mobilestation.
What are 3g UMTS physical & logical channels?
The channels carried are categorised into three:
- Logical Channels: The logical channels define the way in which the data will be transferred.
- Physical channels: The physical channels carry the payload data and govern the physical characteristics of the signal.
What are logical transport and physical channels?
Physical channels: These are transmission channels that carry user data and control messages. Logical channels: Provide services for the Medium Access Control (MAC) layer within the LTE protocol structure.
What is 5g logical channel?
Logical channel: Logical channels can be one of two groups: control channels and traffic channels: Control channels: The control channels are used for the transfer of data from the control plane. Traffic channels: The traffic logical channels are used for the transfer of user plane data.
How many types of channels are there in Wcdma?
As shown in the figure, there are three types of UMTS channels viz. logical channels(RLC layer), transport channels(MAC layer) and physical channels(PHY layer). As they tranverse between layers they map to other layer frames.
Which channel is more robust?
Forward channel
Explanation: Forward channel is more robust than the reverse channel.
What is Cpich Wcdma?
CPICH stands for Common Pilot Channel in UMTS and some other CDMA communications systems. In WCDMA FDD cellular systems, CPICH is a downlink channel broadcast by Node Bs with constant power and of a known bit sequence. Its power is usually between 5% and 15% of the total Node B transmit power.
What are the logical channels 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).
How many types of channels are there in WCDMA?
There are 3 different types of channels in WCDMA – 9. 1. Logical channels : Used for communication between Layer 3 (RRC) & Layer 2 (RLC/MAC).
How much bandwidth does WCDMA use?
The WCDMA system uses the same 5 MHz bandwidth size radio channels for WCDMA voice and WCDMA data. To maximize the data transfer rate, the WCDMA forward radio channel can use different types of modulation and different amounts of signal spreading (processing gain).
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.
What is the difference between UMTS/WCDMA and WCDMA?
UMTS/WCDMA Logical Channel Function Direction Duplex Mode Dedicated traffic channel(DTCH) carry user plane data (speech/packet data) Uplink(UL)/Downlink(DL) FDD/TDD Dedicated control channel(DCCH) carry signalling messages used for control operations Uplink/Downlink FDD/TDD Shared control channel(SHCCH) carry control messages Uplink/Downlink TDD