Channel allocations in a communications system

• US 20030031149A1
• Filed: 03/25/2002
• Published: 02/13/2003
• Est. Priority Date: 05/07/2001
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Wei, Yongbin, Lundby, Stein A., Puig-Oses, David, Odenwalder, Joseph P., Sarkar, Sandip
• Granted Patent: US 7,298,718 B2
• Time in Patent Office: Days
• US Class Current: 370/337
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

Systems and techniques for communications include calculating a value from data, transmitting the value and data over at least one time slot, receiving the transmission, recalculating the value from the received data, and determining the number of time slots of the transmission from the calculated and recalculated values. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Claims

1. A method of communications, comprising:

calculating a value from data;

transmitting the value and data over at least one time slot;

receiving the transmission;

recalculating the value from the received data; and

determining the number of time slots of the transmission from the calculated and recalculated values.

2. The method of claim 1 wherein the determination of the number of time slots of the transmission comprises comparing the calculated and recalculated values.

3. The method of claim 2 wherein the recalculation of the value comprises performing the recalculation over a plurality of different numbers of time slots until the calculated and recalculated values compare.

4. The method of claim 1 wherein the value comprises a cyclic redundancy check.

5. The method of claim 1 further comprising encoding the value and data before the transmission.

6. The method of claim 5 further comprising adding an encoder tail to the value and data, and encoding the value, data and encoder tail before the transmission.

7. The method of claim 5 further comprising demultiplexing the encoded value and data into first and second sequences, and spreading each of the first and second sequences with a different code before the transmission.

8. The method of claim 7 further comprising shifting the one of the first and second sequences in time before the transmission.

9. The method of claim 1 further comprising repeating the value and data twice before the transmission, wherein the transmission comprises transmitting the repeated value and data over two time slots.

10. The method of claim 1 further comprising repeating the value and data four times before the transmission, wherein the transmission comprises transmitting the repeated value and data over four time slots.

11. The method of claim 1 further comprising repeating the value and data twice, demultiplexing- the repeated value and data into a first sequence on a first channel and a second sequence on a second channel, and repeating each of the first and second sequences twice, wherein the transmission comprises transmitting each of the repeated first and second sequences on their respective first and second channels over four time slots.

12. A communications system, comprising:

a base station having a channel element configured to calculate a value from data, and a transmitter configured to transmit the value and data over at least one time slot; and

a subscriber station having a receiver configured to receive the transmission, and a processor configured to recalculate the value from the received data, and determine the number of time slots of the transmission from the calculated and recalculated values.

13. The communications system of claim 12 wherein the processor is further configured to determine the number of time slots of the transmission by comparing the calculated and recalculated values.

14. The communications system of claim 13 wherein the processor is further configured to recalculate the value of the received data by performing the recalculation over a plurality of different numbers of time slots until the calculated and recalculated values compare.

15. The communications system of claim 12 wherein the value comprises a cyclic redundancy check.

16. The communications system of claim 12 wherein the channel element further comprises an encoder configured to encode the value and data before the transmission.

17. The communications system of claim 16 wherein the channel element further comprises an encoder tail generator configured to add an encoder tail to the value and data, the encoder being further configured to encode the value, data and encoder tail before the transmission.

18. The communications system of claim 16 wherein the channel element further comprises a demultiplexer configured to demultiplex the encoded value and data into first and second sequences, and a multiplier configured to spread each of the first and second sequences with a different code before the transmission.

19. The communications system of claim 18 wherein the channel element further comprises a shifter configured to shift one of the first and second sequences in time before the transmission.

20. The communications system of claim 12 wherein the channel element further comprises a repeater configured to repeat the value and data twice before the transmission, and wherein the transmitter is further configured to transmit the repeated value and data over two time slots.

21. The communications system of claim 12 wherein the channel element further comprises a first repeater configured to repeat the value and data twice, a demultiplexer configured to demultiplex the repeated value and data into a first sequence on a first channel and a second sequence on a second channel, a second repeater configured to repeat the first sequence twice, and a third repeater configured to repeat the second sequence twice, and wherein the transmitter is further configured to transmit each of the repeated first and second sequences on their respective first and second channels over four time slots.

22. A receiving device, comprising:

a receiver configured to receive a transmission over at least one time slot, the transmission comprising data and a value calculated from the data; and

a processor configured to recalculate the value from the received data, and determine the number of time slots of the transmission from the calculated and recalculated values.

23. The receiving device of claim 22 wherein the processor is further configured to determine the number of time slots of the transmission by comparing the calculated and recalculated values.

24. The receiving device of claim 23 wherein the processor is further configured to recalculate the value of the received data by performing the recalculation over a plurality of different numbers of time slots until the calculated and recalculated values compare.

25. The receiving device of claim 23 further comprising memory configured to store the received value and data, a demodulator configured to demodulate the value and data released from the memory, a decoder configured to decode the demodulated value and data, the demodulated value and data being coupled to the processor to recalculate the value from the demodulated data and compare the demodulated value with the recalculated value.

26. The receiving device of claim 25 wherein the processor is further configured to control the release of the received value and data from memory as a function of the comparison.

27. The receiving device of claim 22 wherein the value comprises a cyclic redundancy check.

28. Computer-readable media embodying a program of instructions executable by a computer program to perform a method of communications, the method comprising:

receiving a transmission over at least one time slot, the transmission comprising data and a value calculated from the data;

recalculating the value from the received data; and

determining the number of time slots of the transmission from the calculated and recalculated values.

29. The computer-readable media of claim 28 wherein the determination of the number of time slots of the transmission comprises comparing the calculated and recalculated values.

30. The computer-readable media of claim 29 wherein the recalculation of the value comprises performing the recalculation over a plurality of different numbers of time slots until the calculated and recalculated values compare.

31. The computer-readable media of claim 28 wherein the value comprises a cyclic redundancy check.

32. A communications system, comprising:

a base station having means for calculating a value from data, and transmission means for transmitting the value and data over at least one time slot; and

a subscriber station having means for receiving the transmission, recalculation means for recalculating the value from the received data, and determination means for determining the number of time slots of the transmission from the calculated and recalculated values.

33. The communications system of claim 32 wherein the determination means determines the number of time slots of the transmission by comparing the calculated and recalculated values.

34. The communications system of claim 33 wherein the recalculation means recalculates the value of the received data by performing the recalculation over a plurality of different numbers of time slots until the calculated and recalculated values compare.

35. The communications system of claim 32 wherein the value comprises a cyclic redundancy check.

36. The communications system of claim 32 further comprising encoder means for encoding the value and data before the transmission.

37. The communications system of claim 36 further comprising means for adding an encoder tail to the value and data, wherein the encoder means encodes the value, data and encoder tail before the transmission.

38. The communications system of claim 36 further comprising means for demultiplexing the encoded value and data into first and second sequences, and means for spreading each of the first and second sequences with a different code before the transmission.

39. The communications system of claim 38 further comprising means for shifting one of the first and second sequences in time before the transmission.

40. The communications system of claim 32 further comprising means for repeating the value and data twice before the transmission, and wherein the transmission means transmits the repeated value and data over two time slots.

41. The communications system of claim 32 further comprising means for repeating the value and data twice, means for demultiplexing the repeated value and data into a first sequence on a first channel and a second sequence on a second channel, means for repeating the first sequence twice, and means for repeating the second sequence twice, and wherein the transmission means transmits each of the repeated first and second sequences on their respective first and second channels over four time slots.

42. A receiving device, comprising:

means for receiving a transmission over at least one time slot, the transmission comprising data and a value calculated from the data;

recalculation means for recalculating the value from the received data; and

determination means for determining the number of time slots of the transmission from the calculated and recalculated values.

43. The receiving device of claim 42 wherein the determination means determines the number of time slots of the transmission by comparing the calculated and recalculated values.

44. The receiving device of claim 43 wherein the recalculation means recalculates the value of the received data by performing the recalculation over a plurality of different numbers of time slots until the calculated and recalculated values compare.

45. The receiving device of claim 42 further comprising means for storing the received value and data, means for demodulating the value and data released from the memory, and means for decoding the demodulated value and data, wherein the recalculating means recalculates the value from the demodulated data and the determination means compares the demodulated value with the recalculated value.

46. The receiving device of claim 45 further comprising means for releasing the received value and data from memory as a function of the comparison.

47. The receiving device of claim 42 wherein the value comprises a cyclic redundancy check.