Receiver for time division multiplex system without explicit time slot assignment
First Claim
1. A code division multiple access (CDMA) subscriber unit comprising:
- a circuitry for receiving a shared channel, wherein the shared channel carries data in distinct time intervals, each time interval of the shared channel carries data for one specific CDMA subscriber unit, at least a portion of the data for the one specific CDMA subscriber unit is modulo-2 combined with a CDMA subscriber unit specific cover sequence associated with that one specific CDMA subscriber unit;
a circuitry for receiving information for use in determining which CDMA subscriber unit specific cover sequence is associated with the CDMA subscriber unit, wherein the CDMA subscriber unit specific cover sequence determining information is received during a configuration process;
a circuitry for discarding data of one of the time intervals of the received shared channel if an error is detected based on an error detection code;
wherein the CDMA subscriber unit does not receive an assignment of the distinct time interval of the shared channels; and
a circuitry for recovering data of one of the time intervals if an error is not detected based on the error detection code;
wherein the recovered data includes a field including a first portion of a packet, a sequence number field and a length field;
wherein a second portion of the packet is recovered by the circuitry configured to recover data in a different one of the time intervals and combine the first portion with at least the second portion to recover the packet.
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Accused Products
Abstract
A technique for a time division multiplex system in which access to shared broadcast communication media is granted on a demand basis. Particular connections are assigned slot times at the transmitter based on demand. However, no specific information regarding the assignment of time slots need be communicated to the receivers. The transmit side employs a forward error correction technique followed by multiplication by a cover sequence unique to each connection. All receivers listen to the broadcast transmission channel all of the time. The receiver assigned to each connection decodes the signals in such a manner that only the receiver with the correct cover sequence assigned to a particular connection will successfully decode the data associated with that connection. Data frames that fail the forward error correction process are discarded, and only those frames which are successfully decoded are passed up to a higher layer. The occurrence of an erroneously received frame is not necessarily always reported to the transmit side of the connection; only a packet level error indication is made. In this way, information containing time slot assignment need not be communicated between the transmitter and receiver, and yet data will be correctly received.
103 Citations
31 Claims
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1. A code division multiple access (CDMA) subscriber unit comprising:
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a circuitry for receiving a shared channel, wherein the shared channel carries data in distinct time intervals, each time interval of the shared channel carries data for one specific CDMA subscriber unit, at least a portion of the data for the one specific CDMA subscriber unit is modulo-2 combined with a CDMA subscriber unit specific cover sequence associated with that one specific CDMA subscriber unit; a circuitry for receiving information for use in determining which CDMA subscriber unit specific cover sequence is associated with the CDMA subscriber unit, wherein the CDMA subscriber unit specific cover sequence determining information is received during a configuration process; a circuitry for discarding data of one of the time intervals of the received shared channel if an error is detected based on an error detection code;
wherein the CDMA subscriber unit does not receive an assignment of the distinct time interval of the shared channels; anda circuitry for recovering data of one of the time intervals if an error is not detected based on the error detection code;
wherein the recovered data includes a field including a first portion of a packet, a sequence number field and a length field;
wherein a second portion of the packet is recovered by the circuitry configured to recover data in a different one of the time intervals and combine the first portion with at least the second portion to recover the packet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for use by a code division multiple access (CDMA) subscriber unit, the method comprising:
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receiving a shared channel, wherein the shared channel carries data in distinct time intervals, each time interval of the shared channel carries data for one specific CDMA subscriber unit, at least a portion of the data for the one specific CDMA subscriber unit is modulo-2 combined with a CDMA subscriber unit specific cover sequence associated with that one specific CDMA subscriber unit; receiving information for use in determining which CDMA subscriber unit specific cover sequence is associated with the CDMA subscriber unit, wherein the CDMA subscriber unit specific cover sequence determining information is received during a configuration process; discarding data of one of the time intervals of the received shared channel if an error is detected based on an error detection code;
wherein the CDMA subscriber unit does not receive an assignment of the distinct time interval of the shared channel;recovering data of one of the time intervals if an error is not detected based on the error detection code;
wherein the recovered data includes a field including a first portion of a packet, a sequence number field and a length field; andrecovering data of a second portion of the packet in a different one of the time intervals and combining the first portion with at least the second portion to recover the packet. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A code division multiple access (CDMA) base station comprising:
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a circuitry for transmitting a shared channel, wherein the shared channel carries data in distinct time intervals, each time interval of the shared channel carries data for one specific CDMA subscriber unit, at least a portion of the data for the one specific CDMA subscriber unit is modulo-2 combined with a CDMA subscriber unit specific cover sequence associated with that one specific CDMA subscriber unit; and a circuitry for transmitting information for use in determining which CDMA subscriber unit specific cover sequence is associated with a CDMA subscriber unit, wherein the CDMA subscriber unit specific cover sequence determining information is transmitted during a configuration process; and wherein the base station does not transmit an assignment of the distinct time interval of the shared channel and each distinct time interval includes an error detection code for use by the subscriber unit in error detection of the data of the shared channel; and a circuitry for splitting a packet into a first sub-packet and a second sub-packet;
wherein each of the first and second sub packets include a portion of the packet, a sequence number field and a length field;
wherein the first sub-packet is transmitted in a different distinct time interval to the CDMA subscriber unit than the second sub-packet.
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Specification