Tài liệu tham khảo bằng tiếng Anh nói về các kênh vô tuyến trong mạng 3G | WCDMA Channels 10th Aug 2007 Deepak Logical Channels are not actually channels but rather they can be defined as different tasks performed by the network and the UE at different times. They describe the type of information to be transferred. Logical channels are categorized into control channels and traffic channels. Control channels carry the control plane information Traffic Channels carry the user plane information Transport channels describes how the logical channels will be transferred, or it can be defined as how and with what characteristics data is transferred over the interface. It comes into two groups: Dedicated Channels Common Channels WCDMA Channels Radio Frame Structure In WCDMA the information is spread over 5MHz band (Wide Bandwidth). There are separate radio channels for both uplink and downlink of 5MHz. One radio frame consist of 38400 chips and 15 slots. The duration of the radio frame is 10ms which have ship rate of Mcps. Each slots in the radio frame . | WCDMA Channels 10th Aug 2007 Deepak Logical Channels are not actually channels but rather they can be defined as different tasks performed by the network and the UE at different times. They describe the type of information to be transferred. Logical channels are categorized into control channels and traffic channels. Control channels carry the control plane information Traffic Channels carry the user plane information Transport channels describes how the logical channels will be transferred, or it can be defined as how and with what characteristics data is transferred over the interface. It comes into two groups: Dedicated Channels Common Channels WCDMA Channels Radio Frame Structure In WCDMA the information is spread over 5MHz band (Wide Bandwidth). There are separate radio channels for both uplink and downlink of 5MHz. One radio frame consist of 38400 chips and 15 slots. The duration of the radio frame is 10ms which have ship rate of Mcps. Each slots in the radio frame comprises of 2650 chips. In uplink and downlink direction, each slot in a radio frame is defined with a code or a set of codes that carries a set of common and dedicated channels called Physical Channel. The information rate of the channel varies from 15 kbps to 1920 kbps for downlink and 30 kbps to 1920 kbps corresponding to available Spreading Factor. In Downlink spreading factor from 256 to 4 and in downlink from 512 to 4. Physical channels are the transmission media providing platform (radio) through which information is going to be transferred Physical Channels means different kinds of bandwidths allocated for different purposes, its actually is the physical existence of the Uu interface between UE domain and Access domain. Physical channel are defined by specific carrier freq, scrambling and channelization code Physical Channel Broadcast Control Channel (BCCH): It broadcast system control information for all mobiles in a cell like Code values in the cell, neighbors information, allowed .
