Cellular digital packet data mobile data base station
First Claim
1. A method for operating a cellular digital packet data (CDPD) system having at least one mobile data base station (MDBS) associated with an advance mobile phone system (AMPS) base station and connected via radio frequency link to at least one mobile end station, the method comprising steps of:
- a. detecting full AMPS communications on all radio frequency channels at said MDBS;
b. deriving a queue of channels based upon AMPS use of said channels;
c. sending said queue of channels to any mobile end systems within range of said MDBS; and
d. selecting channels from said queue at said mobile end station for CDPD use.
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Accused Products
Abstract
A cellular digital packet data (CDPD) system includes a mobile data base station (MDBS) configured to interface easily with an advanced mobile phone system (AMPS). The elements of the MDBS are arranged on modules and the functionality of the MDBS is divided among the modules to facilitate flexibility, compactness and quick expansion of the MDBS. To further facilitate compactness, the MDBS includes a transceiver/modem board which uses a single chip to carry out delta-sigma modulation. In order to maintain the integrity of CDPD transmission, a channel hopping scheme is used based upon avoidance of AMPS channel use. A distinctive protocol is used to encapsulate control/query/response data for transmission throughout the CDPD system. This protocol also facilitates easy control of each MDBS throughout the system.
241 Citations
20 Claims
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1. A method for operating a cellular digital packet data (CDPD) system having at least one mobile data base station (MDBS) associated with an advance mobile phone system (AMPS) base station and connected via radio frequency link to at least one mobile end station, the method comprising steps of:
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a. detecting full AMPS communications on all radio frequency channels at said MDBS; b. deriving a queue of channels based upon AMPS use of said channels; c. sending said queue of channels to any mobile end systems within range of said MDBS; and d. selecting channels from said queue at said mobile end station for CDPD use. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A cellular digital packet data (CDPD) system associated with an advanced mobile phone system (AMPS) having at least one mobile data base station (MDBS), said MDBS comprising:
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means for detecting AMPS communications on radio frequency channels encompassed within said AMPS system; means for deriving a list based upon AMPS use of said radio frequency channels; means for periodically adjusting said list based on detected AMPS use; and means for sending data regarding said list to a mobile end system within range of said MDBS. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A mobile data base station (MDBS) configured to transfer cellular digital packet data (CDPD) between at least one mobile subscriber and an external communication network (MD-IS), said MDBS having a controller board operatively connected to said MD-IS and a transceiver board providing a radio link to said at least one mobile subscriber, said controller board and said transceiver board comprising:
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a. means for receiving encoded data from an external network management system (NMS); b. means for decoding said encoded data according to a first protocol; and c. means for decapsulating said decoded data according to an MDBS utility protocol (MUP) different from said first protocol.
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Specification