Diversity technology means that after receiving two or more input signals with mutually uncorrelated fading at the same time, the system demodulates these signals and adds them up. Thus, the system can receive more useful signals and overcome fading. A mobile communication channel is a multi-path fading channel and any transmitted signal reaches a receive … Read more
Pilot Detection Threshold (T_ADD) Any Pilot that is strong but is not in the Handoff Direction Message is a source of interference. This Pilot should be immediately moved into the active set for handoff to avoid voice/data degradation or a possible drop call. T_ADD affects the percentage of MS in handoff. It should be low … Read more
Paging Control Channel(PCCH) A downlink channel that transfers paging information and system information change notifications. This channel isused for paging when the network does not know the location cell of the UE Broadcast Control Channel (BCCH) Provides system information to all mobile terminals connected to the eNodeB. A downlink channel for broadcasting system control information … Read more
Downlink Physical Channel of WCDMA Downlink Dedicated Physical Channel: Downlink DPCH Downlink Common Physical Channel: Common Control Physical Channel (CCPCH) Synchronization Channel ( SCH) Paging Indicator Channel (PICH) Acquisition Indicator Channel (AICH) Common Pilot Channel (CPICH) High-Speed Packet Downlink Shared Channel (HS-PDSCH) High-Speed Shared Control Channel (HS-SCCH) Uplink Physical Channel of WCDMA Uplink Dedicated Physical Channel: Uplink … Read more
A physical channel is defined by a specific carrier frequency, code (scrambling code, spreading code) and relative phase. In UMTS system, the different code (scrambling code or spreading code) can distinguish the channels. Most channels consist of radio frames and time slots, and each radio frame consists of 15 time slots. Two types of physical channel: UL and … Read more
Transmitting: The process is similar to that of BS. The frequency offset is pre-corrected. The Ranging and BW Request are generated at the physical layer and a code is selected according to the indication at the MAC layer. After the modulation, they are mapped to competitive slots selected at the MAC layer. Later, they are … Read more
Transmitting: After being processed at the MAC layer, the downlink data is sent to the physical layer inthe format of MAC PDU. The MAC PDU arranges the data block size according to the allocation results of radio resources at the MAC layer. After the data packets are processed through the channel coding, modulation, and IFFT … Read more
In the context of WiMAX (Worldwide Interoperability for Microwave Access), NAP and NSP are important entities that play crucial roles in providing wireless broadband services. What is NAP & NSP in Wimax ? How it Works ? Let’s delve into what NAP and NSP stand for, and how they work together within the WiMAX ecosystem. … Read more
CSN – Core Service Network. Definition It is a combination of a set of network functions and provides IPconnections for the WiMAX subscribers. The CSN consists of the router,AAA agent or server, subscriber database, and Internet gateway equipment. The CSN can a new network entity in a new WiMAX system or can realize the functions … Read more
ASN – Access Service Network. Establish layer 2 connections between the BS and the MS. Transmit AAA messages to the home NSP of the MS. Assist the high level to establish layer 3 connections with the MS and assignthe IP addresses. Perform the radio resource management (RRM). Perform the intra-ASN mobility management and handover. Perform … Read more