Method and apparatus for data and control multiplexing

• US 8,363,606 B2
• Filed: 08/29/2007
• Issued: 01/29/2013
• Est. Priority Date: 09/05/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Montojo, Juan, Malladi, Durga Prasad, Willenegger, Serge D.
• Primary Examiner(s): ROBERTS, BRIAN S
• Application Number:
  US11/847,307
• Publication Number:
  US 20080095110A1
• Time in Patent Office: 1,980 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 5/0017 in which a distinct code is applied, as a temporal sequence, to each frequency
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource

Abstract

System(s) and method(s) are provided for transmitting data code symbols and control code symbols spanning disparate transmission time intervals in the uplink. Data and control symbols that overlap in time-domain within a transmission time interval are multiplexed and transmitted employing resources scheduled for data transmission, whereas data and control code symbols that are not multiplexed are transmitted in respective allocated resources. Multiplexing in conjunction with localized and distributed resource scheduling preserves the single-carrier characteristics of a single-carrier frequency division multiple access system.

Claims

1. An apparatus utilized in wireless communications, comprising:

a processor configured;

to receive an allocation of resources to transmit data and control code symbols, wherein transmission of control code symbols occurs during a primary transmission time interval (TTI) and transmission of data code symbols occurs during a secondary TTI, said primary TTI exceeding said secondary TTI;

to determine periodically whether the data and the control code symbols are to be transmitted during a specific time interval common to the primary and secondary TTI;

to multiplex the data and the control code symbols when the data and the control code symbols are to be transmitted within the specific time interval;

to employ allocated resources for data transmission to convey the multiplexed data and control code symbols; and

to employ allocated control resources to transmit the control code symbols without the data code symbols when the data and the control code symbols are not to be transmitted within the specific time interval; and

a memory coupled to the processor and configured to store data.

2. The system apparatus of claim 1, wherein the processor is further configured to transmit data and control code symbols in a single-carrier frequency division multiple access mode.

3. The system apparatus of claim 1, wherein the processor is further configured to multiplex data and control code symbols by employing time-division multiplexing or frequency division multiplexing.

4. The system apparatus of claim 1, wherein a plurality of disparate secondary TTIs span the primary TTI.

5. The system apparatus of claim 4, wherein the data code symbols are transmitted during each secondary TTI within the primary TTI.

6. The system apparatus of claim 4, wherein data code symbols are transmitted in every other secondary TTI within the primary TTI.

7. An apparatus that operates in a wireless communication environment, the apparatus comprising:

a processor configured to schedule resources for transmitting multiplexed data code symbols and control code symbols, and to receive transmitted data code symbols multiplexed with control code symbols, wherein the transmitted multiplexed code symbols utilize the resources scheduled for a data transmission, and to receive control code symbols transmitted via dedicated resources scheduled for control transmission, in response to determining that the data and control code symbols are not multiplexed; and

a memory coupled to the processor, wherein the memory is configured to store data.

8. The apparatus of claim 7, wherein the processor is further configured to transmit data code symbols during a first transmission time interval, and to receive control code symbols during a second transmission time interval.

9. The apparatus of claim 8, wherein the processor is further configured to transmit data code symbols during a plurality of transmission time intervals via an N-step hybrid automated repeat request (HARQ), wherein N is natural number greater than or equal to 1.

10. The apparatus of claim 7, wherein the resources scheduled for the data transmission are frequency diverse, frequency localized, or a combination thereof.

11. An apparatus that facilitates communication in a wireless environment, the apparatus comprising:

means for determining whether a received stream of code symbols is a stream of multiplexed data code symbols and control code symbols;

means for demultiplexing the stream of data code symbols and control code symbols in response to determining that the received stream of code symbols is multiplexed; and

means for receiving control code symbols transmitted via a dedicated resource allocation in response to determining that the received stream of code symbols is not multiplexed.

12. A method employed in a wireless communication system, the method comprising:

receiving scheduled resources for transmitting data and control code symbols;

determining periodically whether data and control code symbols are to be transmitted during a specific time interval;

multiplexing the data and the control code symbols when the data and the control code symbols are to be transmitted within the specific time interval;

transmitting the multiplexed code symbols employing allocated resources for data transmission; and

transmitting the control and the data code symbols via respective allocated resources when the data code symbols are not to be transmitted within the specific time interval.

13. The method of claim 12, wherein the scheduled resources include a minimum transmission time interval consistent with a specification of the wireless communication system.

14. The claim of method 12, wherein the specific time interval is a multiple of a minimum transmission time interval.

15. The method of claim 12, wherein the multiplexed code symbols span a plurality of transmission time intervals (TTIs), and wherein a control TTI comprises the plurality of TTIs.

16. The method of claim 15, further comprising determining a plurality of data transmission time intervals that reduce transmission latency.

17. The method of claim 12, wherein the multiplexing is an M-to-1 multiplexing of a set of M−

1 control-code symbols and a set of data code symbols, wherein M is a natural number greater than or equal to 1.

18. The method of claim 12, wherein the scheduled resources for transmitting control code symbols and data code symbols are frequency localized.

19. The method of claim 12, wherein the scheduled resources for transmitting control code symbols and data code symbols are frequency distributed.

20. The method of claim 12, wherein the scheduled resources for transmitting control symbols are frequency localized and the resources for transmitting data code symbols are distributed.

21. The method of claim 12, wherein the scheduled resources for transmitting control code symbols are frequency distributed and the allocated resources for transmitting data code symbols are frequency localized.

22. The method of claim 12, further comprising:

receiving first and second downlink data streams, wherein the first downlink data stream is received during a first sub-transmission time interval (sub-TTI) and the second downlink data stream is received during a second sub-TTI, and wherein the first sub-TTI and the second sub-TTI are included in a data TTI;

in response to receiving the first and second downlink data streams, scheduling respective first and second orthogonal resources; and

transmitting a first hybrid automated repeat request (HARQ) and a second HARQ employing the respective first and second orthogonal resources.

23. The method of claim 22, wherein the first and second orthogonal resources comprise orthogonal frequency subcarriers of a single frequency carrier in a single carrier frequency division multiple access (SC-FDMA) network.

24. A non-transitory machine-readable medium comprising instructions which, when executed by a machine, cause the machine to:

receive scheduled resources for transmitting data and control code symbols;

determine periodically whether data and control code symbols are to be transmitted during a specific time interval;

multiplex the data and the control code symbols if the data and the control code symbols are to be transmitted within the specific time interval;

transmit the multiplexed data and control code symbols employing a set of scheduled resources for data transmission; and

transmit the control and data code symbols via respective sets of scheduled resources when the data code symbols are not transmitted to be within the specific time interval.

25. A non-transitory machine-readable medium with instructions stored thereon that, when executed by a processor, cause the processor to:

transmit a first set of data code symbols in a first transmission time interval (TTI);

receive control code symbols during a second TTI that includes and is longer than the first TTI; and

receive control code symbols multiplexed with a second set of data code symbols, if the data code symbols in the second set are transmitted within the second TTI, wherein the multiplexed code symbols are transmitted on resources scheduled for data transmission.

26. The non-transitory machine-readable medium of claim 25, further storing instructions that, when executed by a processor, allocate a set of resources, wherein the resources are frequency diverse or frequently selective.

27. A method employed in a wireless communication environment, the method comprising:

scheduling an allocation of resources for transmitting data code symbols and control code symbols;

receiving a first stream of code symbols;

determining whether the first stream of code symbols includes multiplexed data code symbols and control code symbols that are multiplexed via resources allocated to data transmission;

if the first stream of code symbols includes multiplexed data code symbols and control code symbols, de-multiplexing the multiplexed data code symbols and control code symbols in the allocated resources for data transmission; and

receiving a second stream of control code symbols via resources dedicated for control transmission in response to determining that the first stream of code symbols does not include multiplexed data code symbols and control code symbols.

28. The method of claim 27, wherein determining that the data code symbols and the control code symbols are multiplexed in the resources allocated to data transmission comprises determining that no code symbols have been received during a time interval scheduled to receive control code symbols and in a region of a physical uplink control channel (PUCCH).

29. The method of claim 28, wherein determining that no code symbols have been received during the time interval scheduled to receive control code symbols and in the region of the PUCCH comprises determining that subcarriers in the region do not contain non-zero coefficients at the time scheduled to receive control code symbols.

30. A method of receiving code symbols at an access point, the method comprising:

receiving a first stream via a wireless uplink channel;

determining that the first stream was not received during a time interval scheduled to receive control symbols and in a frequency region of a physical uplink control channel (PUCCH);

in response to determining that the first stream was not received in the frequency region of the PUCCH during the time interval scheduled to receive control symbols, determining that the first stream includes multiplexed first data code symbols and first control code symbols;

demultiplexing the multiplexed first data code symbols and first control code symbols, wherein the first data code symbols are received during a first transmission time interval (TTI) and the first control code symbols are received during a second TTI, and wherein the first TTI and the second TTI partially overlap in time and are partially distinct in time;

receiving a second stream via the wireless uplink channel;

determining that the second stream was received during a time interval scheduled to receive control symbols and in the frequency region of the PUCCH; and

in response to determining that the second stream was received in the frequency region of the PUCCH during the time interval scheduled to receive control symbols, determining that the second stream of second code symbols does not include multiplexed data code symbols and control code symbols.

31. The method of claim 30, wherein the first stream of first code symbols is received via a data channel, wherein the second stream of second code symbols is received via a control channel, and wherein the data channel is distinct from the control channel.

32. The method of claim 30, wherein the demultiplexing is performed at least in part via an inverse/direct fast Fourier transform (I/D FFT) component and via a demultiplexing (DEMUX) component.