摘要:
The invention once stores PCM data to a memory and after a predetermined time is elapsed, reading in again and making to output whereby makes to delay the PCM data. The invention comprises a memory for once storing a PCM data converted to parallel, a delay time setting circuit for setting a delay time of PCM data, and a comparator and control circuit for comparing a setting value from the delay time setting circuit and a high order 10 bits writing address of the memory and thereby providing an address and control signal for either initiating a high order 10 bits reading address of the memory or else for writing or reading to the memory.
摘要:
The invention is a method for controlling an echo canceller circuit including a data storage for storing a program for processing digital signals to cancel an echo in PCM encoded voice data, a plurality of digital signal processors each having a reset terminal and which are downloaded with the program which is executed by the plurality of digital signal processor to carry out removal of the echo in the PCM encoded voice data, and a one chip controller for performing control functions of the echo canceller. The method comprises the steps after completion of initialization of the one chip controller, controlling the reset terminals of the digital signal processors to maintain all of the digital signal processors in reset state; releasing one digital signal processor from the reset state and downloading the program to the one released digital signal processor from the data storage; and the released one digital signal processor processing the PCM encoded voice data with the program to remove the echo from the PCM encoded voice data.
摘要:
A wireless access router for separately controlling a traffic signal and a control signal is provided. In a mobile communication access network structure, in order to optimally support a mobile communication terminal, a control signal and a traffic signal of a base station are divided, and a router is controlled by mobile communication system functions such as a mobility management function, a QoS management function, a session control of the terminal, a mobility control, and a QoS control function that are effectively processed. With a wireless access router having the divided control signal and traffic signal, it is expected the traffic concentration and a packet transmission delay can be prevented.
摘要:
A method for scheduling packets from a plurality of radio bearers by a scheduler of a first layer includes calculating a virtual scheduling time for the radio bearers by using a packet delay variation of the radio bearers, and transmitting the packet of the radio bearer having the greatest virtual scheduling time from among the plurality of radio bearers to a second layer.
摘要:
A base station controller interface of the code division multiple access (CDMA) mobile system is described for interfacing between the base station controller and the CDMA mobile switching center (MSC) of the CDMA mobile system (CMS). The base station controller decreases the load of the system by including, for every base station controller interface, the mobile announcement (MANM) to service the state information of the subscriber of interest for all paging to the mobile subscriber. At the same time, the connection between the base station controller and the base station controller interface of the mobile switching center utilizes the EL 2048 Kbps interfacing technique applying the conventional communication network recommended in the ITU-T. The transmission of the message and the call traffic using the interfacing technique is performed to be linked with the TSB of the base station controller. The control signal for processing the call is accomplished by using the inner communication message protocol which is connected in the EIA-422 interfacing mode to the call control processor of the base station controller. Therefore, the present invention effectively performs the call processing function to the mobile subscriber, the mobility management function, the mobile subscriber announceable function, and the itself operational preservative function. Also, the present invention transmits between the call processing control information and the call traffic. Therefore, the present invention increases the capacity of the subsystem in the conventional full electronic telephone exchanger, and has a effect to easily embody the subsystem in the mobile switching center for more economical connection thereof.
摘要:
Provided are an Internet protocol (IP) converged mobile access gateway for a 3rd generation (3G) mobile service and a service method using the same. The IP converged mobile access gateway including: an access controller adapted to exchange a control signal with the base station and perform mobility control for the terminal and session control for a service request; a transport controller adapted to perform routing database information management and routing protocol processing for packet routing; and a transport executor adapted to set a tunnel with the base station for user data transmission according to control information sent from the access controller, configure a packet data convergence protocol (PDCP) for a logical connection with the terminal, and interwork with the transport controller to perform packet routing and forwarding.
摘要:
The present invention relates to an internet protocol (IP) mobile communication system and a session initiation method thereof. In the IP mobile communication system, a session initiation process using a session initiation protocol is performed for real-time mobile multimedia communication. At this time, not only multimedia codec but also session and quality of service (QoS) information is negotiated from a transmitting terminal to a receiving terminal, and is negotiated between relating network elements. An access manager controls a mobile access router which is a gateway of an access network according to the negotiated session and QoS information. Therefore an additional QoS negotiation process is not necessary for a session guaranteeing the QoS between a terminal and the mobile access router, between the mobile access routers, and between the mobile access router and the receiving terminal.
摘要:
There is provided a method for performing an intra-packet data service node (PDSN) soft handoff. The method is implemented by setting up a channel passing through a target base station controller (T-BSC), a source base station controller (S-BSC) and a PDSN by establishing a direct channel link between the S-BSC and the T-BSC in an active packet session mode, performing a handoff between the S-BSC, the T-BSC and a mobile station (MS), transmitting or receiving user packet data exchanged between the MS, and the S-BSC and the T-BSC to or from the PDSN through the established channel link and sending or receiving user packet data exchanged between the MS and the T-BSC to or from the PDSN through the established channel link when the handoff is completed.
摘要:
A minimum value/maximum value extractor and method including: a multiplexer for outputting data and inverted data receiving from data lines depending on a maximum/minimum value selecting signal; a plurality of maximum value extracting parts for receiving the output of the multiplexer, a clock signal and a reset signal, the extracting parts outputting a first output which becomes the same signal state as that of the initially input data bits and maintains "0" regardless of subsequent data bits value once the input data bit becomes "0" until the reset signal is applied, and a second output which follows the first output value by delayed by two clock cycles; a maximum value/minimum value signal generator for outputting a value which is a NORed value of all inputs from the extracting parts as a minimum value or a value which is an inverted value of the NORed value of all inputs from the extracting parts as a maximum value; and a plurality of reset signal generators for generating the reset signal for resetting the first output of the extracting parts as an initial value if the two input signals are at the same state,wherein a data string in which the second output of each maximum value extracting part is "1" is the data string having the maximum/minimum values among a plurality of data bit strings and a value output through the maximum/minimum value signal generator becomes the maximum/minimum value.