CDMA communication system which selectively allocates bandwidth upon demand
DCFirst Claim
1. A wireless digital CDMA communication system, including a base station and at least one subscriber unit, for transmitting a plurality of communications having independent data rates between a base station and a subscriber unit, the system comprising:
- at least one base station comprising;
first means for processing a first communication for transmitting to said at least one subscriber unit including first means for determining the data rate required to support said first communication; and
first transmission means for transmitting communications at one of said plurality of data rates having data rate selection means responsive to said first determining means;
and at least one subscriber unit comprising;
means for establishing a communication channel having a capacity of a first data communication rate;
means for communicating at a second data communication rate, wherein said first data communication rate is higher than said second data communication rate;
second means for processing a second communication for transmitting to said base station including second means for determining the data rate required to support said communication;
second transmission means for transmitting communications at one of a plurality of data rates including data rate selection means responsive to said second determining means; and
means for establishing a ISDN channel including two B channels and a D channel;
wherein said system selectively utilizes said B and said D channels depending upon the later rate required to support said desired communication.
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Abstract
A CDMA wireless digital communication system which supports all types of voice and data communications while utilizing the minimum amount of bandwidth for the particular application. The system efficiently allocates ISDN bandwidth on demand by a subscriber. Upon initialization of the subscriber unit, the system establishes a channel and generates the necessary spreading codes to support the highest capacity channel desired by the subscriber unit. Portions of the communication spectrum bandwidth are not reserved until actually required by the subscriber unit. Since the call setup is performed at the beginning of a call from that subscriber unit, including the assignment of spreading codes, a subscriber unit can quickly gain access to the portion of the spectrum that is required to support the particular application.
103 Citations
18 Claims
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1. A wireless digital CDMA communication system, including a base station and at least one subscriber unit, for transmitting a plurality of communications having independent data rates between a base station and a subscriber unit, the system comprising:
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at least one base station comprising; first means for processing a first communication for transmitting to said at least one subscriber unit including first means for determining the data rate required to support said first communication; and first transmission means for transmitting communications at one of said plurality of data rates having data rate selection means responsive to said first determining means; and at least one subscriber unit comprising; means for establishing a communication channel having a capacity of a first data communication rate; means for communicating at a second data communication rate, wherein said first data communication rate is higher than said second data communication rate; second means for processing a second communication for transmitting to said base station including second means for determining the data rate required to support said communication; second transmission means for transmitting communications at one of a plurality of data rates including data rate selection means responsive to said second determining means; and means for establishing a ISDN channel including two B channels and a D channel;
wherein said system selectively utilizes said B and said D channels depending upon the later rate required to support said desired communication.
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2. A wireless digital code division multiple access (CDMA) communication system for dynamically switching data communication rates required by users, the system comprising:
at least a first communication station including; means for establishing communication channels of predetermined data transmission rates; means for transmitting a communication at an initial data rate using at least one channel; means for monitoring said communication and determining an adjusted data rate desired for continued support of said communication; means for allocating a sufficient number of channels for the communication based on the adjusted data rate such that the sum of the data rates of the allocated channels is at least equal to the adjusted data rate and is not greater than the adjusted data rate plus a predetermined rate; and means for continuing the transmission of said communication within said allocated channels whereby said station dynamically adds or tears down channels for said communication by changing the number of allocated channels during said communication. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for allocating bandwidth and dynamically switching between different bandwidths in a communication station of a code division multiple access (CDMA) system based upon the data communication rates required by a user comprising:
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a) transmitting a communication at an initial data rate using at least one channel; b) monitoring said communication and determining an adjusted data rate desired for continued support of said communication; c) allocating a sufficient number of channels for the communication based on the adjusted data rate such that the total data rate of the allocated channels is at least equal to the adjusted data rate and is not greater than the adjusted data rate plus a predetermined rate; and d) continuing transmission of said communication within said allocated channels whereby said communication station dynamically adds or tears down channels for said communication by changing the number of allocated channels during said communication. - View Dependent Claims (16, 17, 18)
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Specification