Method and apparatus for communicating heterogeneous data traffic
First Claim
1. A method of communicating Constant Bit Rate (“
- CBR”
) data and Variable Burst Rate (“
VBR”
) data in a single RF carrier via a communication system, said method comprising the steps of;
determining whether the data stream is CBR or VBR;
when said data stream is CBR, communicating the CBR data stream using Code Division Multiplexing/Code Division Multiple Access (“
CDM/CDMA”
) with first spreading factor codewords, whereby a CBR-CDMA data signal is generated; and
when said data stream is VBR data, communicating the VBR data stream using Time Division Multiplexing/Time Division Multiple Access (“
TDM/TDMA”
) and CDM/CDMA with second spreading factor codewords.
1 Assignment
0 Petitions
Accused Products
Abstract
Method and apparatus for communicating heterogeneous data traffic simultaneously using a hybrid Code Division Multiplexing (CDM)/Code Division Multiple Access (CDMA)—Time Division Multiplexing (TDM)/Time Division Multiple Access (TDMA) system which communicates data on a per data type basis, rather than a per user or per channel basis. A transmitter accepts a plurality of data streams, each of which includes either Constant Bit Rate Data (CBR) or Variable Burst Rate Data (VBR), where CBR is characterized by a steady data rate and strict latency requirements and VBR is characterized by a variable data rate with large peaks and lulls and loose latency requirements. The system identifies each input data stream as CBR or VBR. CBR data is spread using CDM/CDMA with an appropriate spreading factor for CBR, whereas VBR data is modulated/encoded and interleaved with CDM/CDMA with an appropriate spreading factor for VBR and TDM/TDMA, respectively. The modulated CBR data and VBR data streams are then transmitted by the transmitter to a receiver, which receives and demodulates the received data streams to recover the original CBR data and VBR data streams. By communicating input data streams based on whether they include CBR data or VBR data, the communication system is able to communicate CBR data and VBR data simultaneously while achieving a superior Quality-of-Service.
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Citations
26 Claims
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1. A method of communicating Constant Bit Rate (“
- CBR”
) data and Variable Burst Rate (“
VBR”
) data in a single RF carrier via a communication system, said method comprising the steps of;
determining whether the data stream is CBR or VBR;
when said data stream is CBR, communicating the CBR data stream using Code Division Multiplexing/Code Division Multiple Access (“
CDM/CDMA”
) with first spreading factor codewords, whereby a CBR-CDMA data signal is generated; and
when said data stream is VBR data, communicating the VBR data stream using Time Division Multiplexing/Time Division Multiple Access (“
TDM/TDMA”
) and CDM/CDMA with second spreading factor codewords. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- CBR”
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14. A communication system for communicating CBR data and VBR data in a single data stream comprising:
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a transmitter for determining whether the data is CBR and VBR;
if said data stream comprises CBR, the transmitter communicating the CBR data stream using CDM/CDMA with first spreading factor codewords, whereby a CBR-CDM or CBR-CDMA data signal is generated; and
if said data stream comprises VBR, the transmitter communicating the VBR data stream using TDM/TDMA and CDM/CDMA with second spreading factor codewords, whereby a VBR-TDM-CDM or VBR-TDMA-CDMA data signal is generated, the first spreading factor codewords being different from the second spreading factor codewords.
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Specification