The second option is quite similar to CDMA — students speaking the same language can understand each other, while other languages are perceived as noise and rejected. Similarly, in radio CDMA, each group of users is given a shared code. Many codes occupy the same channel, but only those users associated with a particular code can communicate. Individual conversations are encoded with a pseudo-random digital sequence and then transmitted using a wide frequency range.
CDMA consistently provides better capacity for voice and data communications, allowing more subscribers to connect at any given time. CDMA is the common platform on which 3G technologies are built. Ref country code : AT.
What is CDMA (Code-Division Multiple Access) ? - Definition from mholivlisrewin.ga
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Ref country code : PT. Payment date : Year of fee payment : Ref country code : FR. Ref country code : DE. Ref legal event code : EUG. Ref legal event code : ST. Ref legal event code : R In accordance with one embodiment of the invention, a set of base stations operating in accordance with the GSM standard generates pilot beacons signals in accordance with CDMA technology. Field of the Invention The present invention relates to wireless telecommunications.
More particularly, the present invention relates to a novel and improved method for providing both code division multiple access and time division multiple access wireless telecommunications service in an area having a Global System for Mobile GSM communications network. A method of switching a subscriber unit in a wireless telecommunications system from a code division multiple access radio frequency signal interface to Global System for Mobile communication time division multiple access radio frequency signal interface during a telephone call comprising the steps of: a determining that the subscriber unit is in a predetermined condition while in code division multiple access mode; and b transmitting data to and from the subscriber unit in accordance with Global System for Mobile communications over-the- air interface.
The method as set forth in claim 1 further comprising the steps of: determining a strength for a set of pilot channels received by the subscriber unit; and generating a pilot strength measurement report indicating said signal strength for each pilot channel received. The method as set forth in claim 2 wherein said predetermined condition occurs when a strength of a pilot channel from a pilot beacon exceeds a strength of a pilot channel in an active set by an amount 0. The method as set forth in claim 1 further comprising the steps of: transmitting a handover required to a Global System for Mobile communications mobile switching center; receiving a handover command from said Global System for Mobile communications mobile switching center; and instructing the subscriber unit to transmit and receive signals in accordance with said Global System for Mobile communications time division multiple access over the air protocol.
A method for subscriber unit handover from code division multiple access wireless telecommunications service to. Global System for Mobile communications time division multiple access wireless telecommunications service comprising the steps of: a exchanging data between the subscriber unit and a base transceiver station via radio frequency signals modulated in accordance with code division multiple access techniques; b determining that the subscriber unit is on a coverage edge; c notifying a Global System for Mobile communications base station that said subscriber unit requires service; and d instructing said subscriber unit to operate in accordance with Global System for Mobile communications time division multiple access standards.
The method as set forth in claim 6 wherein step b comprises the steps of: generating a set of signal strength measurements on a set of pilot channels received by said subscriber unit; and determining a strength of a pilot channel from a pilot beacon exceeds a strength of a pilot channel in an active set by an amount. A method for operating a subscriber unit in a wireless telecommunications system comprising the steps of: a searching for code division multiple access pilot channels; b transmitting strength measurement messages which indicate a pilot strength measurement of each pilot channel received and source indication information; and c transmitting and receiving data in accordance with.
Global System for Mobile communications signal processing techniques when a handover command is received. A cellular telephone system that offers code division multiple access service and Global System for Mobile communications time division multiple access service to a subscriber unit comprising: code division multiple access base station for interfacing with the subscriber unit; code division multiple access pilot beacons for generating a pilot channel indicating an edge of a code division multiple access service region; and code division multiple access base station controller for receiving pilot strength measurement reports from the subscriber unit, and for generating signaling messages that cause the subscriber unit to be handed over to Global System for Mobile communications time division multiple access service when said strength measurement reports indicated a handover is necessary.
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ISBN 13: 9780123909503
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Fundamentals of Communications Access Technologies: FDMA, TDMA, CDMA, OFDMA, AND SDMA
ZAB en. USB1 en. Apparatus and method for transparent wireless communication between a remote device and host system. Wireless telecommunications system utilizing CDMA radio frequency signal modulation in conjunction with the GSM A-interface telecommunications network protocol. Wireless telecommunications system utilizing CDMA radio frequency signal modulation in conjuction with the GSM A-interface telecommunications network protocol.
Idle intersystem roaming determination and system reselection in a CDMA wireless communication system. Process for cooperation between entities of a cellular network of mobile radio in intercellular communication transfers. System and method for providing access to value added services for roaming usersof mobile telephones. Method and apparatus for providing mobile and other intermittent connectivity in a computing environment. USB2 en. Method and apparatus for providing secure connectivity in mobile and other intermittent computing environments.
- Wireless Communications.
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- CDMA (Code-Division Multiple Access)?
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Method for data transmission in a mobile radio system, mobile station and base station. Method and system for generating multiple pilot beacons of different frequencies from a single pilot beacon. Method and system for handoff between an asynchronous cdma base station and synchronous cdma base station. System and method for performing an inter mobile system handover using the internet telephony system.
A method for implementing and terminal handoff between the cellular radio measurements. Method for processing hand-off and call in asynchronous mobile communication system. Method for processing handoff to syncronous cell site from asyncronous cell site in a mobile communication system. JPA en.
The second priority scheme is among neighbor nodes. It is proposed for multiple simultaneous transmissions in the CDMA network. This scheme gives a larger chance of correct transmission to high priority traffic than low priority traffic. In addition, we propose to use adaptive spreading gain and a frame structure to achieve high resource utilization.
Simulation results demonstrate that the proposed schemes can achieve effective QoS guarantee. A wireless mesh network WMN consists of a wireless mesh backbone and wireless mesh clients. In contrast, the mesh clients are mostly mobile nodes that can work as routers as well, but their hardware and software platforms are simpler than those of the mesh routers. Recently WMNs have been a subject of extensive research due to their characteristics, such as low cost, ease of maintenance, self organization, large coverage, ease of expansion, and robustness.
These significant characteristics can help to support several applications in the public and private sectors. Irrespective of military applications, many promising civilian applications have been presented 1 , 2 , e. Several applications are already in place 2. Currently, many efforts are underway to standardize protocols for the operation and management of WMNs. Code division multiple access CDMA is a spread spectrum technique, in which each user can use the whole system bandwidth at all time, with unique codes for receiving and transmitting.