Abstract
Certain aspects of the present disclosure relate to techniques for reducing the decoding complexity for low cost devices (e.g. low cost UEs). One technique may include simplifying the PDCCH format. This may include generating a compact DCI format for transmitting DCI to a low cost device. The compact DCI format may correspond to at least one standard DCI format used by a regular UE and may comprise a reduced number of bits when compared to the standard DCI format. Another technique may include reducing the number of blind decodes. This technique may include selecting a set of resources for transmitting DCI from a limited set of decoding candidates such that a receiving low cost device need only perform blind decodes for the limited set of decoding candidates.
Certain aspects of the present disclosure relate to techniques for reducing the decoding complexity for low cost devices (e.g. low cost UEs). One technique may include simplifying the PDCCH format. This may include generating a compact DCI format for transmitting DCI to a low cost device. The compact DCI format may correspond to at least one standard DCI format used by a regular UE and may comprise a reduced number of bits when compared to the standard DCI format. Another technique may include reducing the number of blind decodes. This technique may include selecting a set of resources for transmitting DCI from a limited set of decoding candidates such that a receiving low cost device need only perform blind decodes for the limited set of decoding candidates.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 4G | 09/03/2016 | ISLD-201606-001 | QUALCOMM INC | Yes | Family Member | ||||
| 4G | 13/03/2019 | ISLD-201904-001 | QUALCOMM INC | No | Family Member | ||||
| 5G | 09/09/2021 | ISLD-202109-013 | QUALCOMM INC | No | Family Member | ||||
Specification Information
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Technologies
Signal Processing
Product
Use Cases
Wireless communication
Services
Claim
1. A method for wireless communications, comprising:', 'generating a compact Downlink Control Information (DCI) format for transmitting DCI for use in at least one of uplink (UL) or downlink (DL) transmissions by a first device of a first type, wherein the compact DCI format corresponds to at least one standard DCI format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCI format; and', 'transmitting the DCI according to the compact DCI format.
2. The method of claim 1, wherein a device of the first type comprises reduced processing capability when compared to a device of the second type.
3. The method of claim 1, wherein the first device comprises a low cost User Equipment (UE).
4. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without bits allocated for resource allocation information, wherein the DCI allocates resources for one user at a time.
5. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI for a limited set of resource allocation possibilities.
6. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI for a limited modulation and coding scheme (MCS).
7. The method of claim 6, wherein the limited MCS comprises Quadrature Phase Shift Keying (QPSK) only with a limited set of possible coding rates.
8. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI for a limited set of Hybrid Automatic Repeat Request (HARQ) processes.
9. The method of claim 8, wherein the DCI lacks an indication of a HARQ process
10. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without a bit allocated for differentiating between DCI formats 1 A and 0, wherein the DCI formats 1 A and 0 have different sizes
11. The method of claim 1 , wherein generating the DCI comprises:', 'generating a reduced length Cyclic Redundancy Check (CRC) for the DCI
12. The method of claim 11, wherein generating the reduced length CRC comprises: generating a CRC of a first length and truncating the CRC of the first length to generate the reduced length CRC
13. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without bits allocated for Redundancy Version (RV)
14. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without bits allocated for Sounding Reference Signal (SRS) request
15. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI with reduced bit-width for Transmitter Power Control', '(TPC)
16. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI with reduced bit-width for Demodulation Reference Signal (DM-RS).', 'The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without a bit allocated for multi-cluster flag18. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without a bit allocated for Virtual Resource Block assignment
19. The method of claim 1, further comprising', 'determining whether periodic channel state information (CSI) is supported; keeping aperiodic CSI if periodic CSI is not supported; and', 'removing aperiodic CSI if periodic CSI is supported.
20. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without a bit allocated for frequency hopping flag.
21. The method of claim 1, wherein generating the DCI comprises:', 'generating the DCI without a bit allocated for Downlink Assignment Index (DAI) and UL assignment index, wherein a one to one mapping is maintained between DL sub frame and UL sub frame for each UE.
22. The method of claim 1, further comprising:', 'selecting a set of resources for transmitting the DCI from a limited set of decoding candidates; and', 'transmitting the DCI using the selected set of resources, such that a receiving UE need only perform blind decodes for the limited set of decoding candidates.
23. An apparatus for wireless communications, comprising:', 'means for generating a compact Downlink Control Information (DCI) format for transmitting DCI for use in at least one of uplink (UL) or downlink (DL) transmissions by a first device of a first type, wherein the compact DCI format corresponds to at least one standard DCI format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCI format; and', 'means for transmitting the DCI according to the compact DCI format.
24. The apparatus of claim 23, wherein a device of the first type comprises reduced processing capability when compared to a device of the second type.
25. The apparatus of claim 23, wherein the first device comprises a low cost User Equipment (UE).
26. The apparatus of claim 23, further comprising:', 'means for selecting a set of resources for transmitting the DCI from a limited set of decoding candidates; and', 'means for transmitting the DCI using the selected set of resources, such that a receiving UE need only perform blind decodes for the limited set of decoding candidates.
27. An apparatus for wireless communications, comprising:', 'at least one processor configured to:', 'generate a compact Downlink Control Information (DCI) format for transmitting DCI for use in at least one of uplink (UL) or downlink (DL) transmissions by a first device of a first type, wherein the compact DCI format corresponds to at least one standard DCI format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCI format; and', 'transmit the DCI according to the compact DCI format, a memory coupled to the at least one processor.
28. A computer program product for wireless communications, comprising:', 'a computer-readable medium comprising code for:', 'generating a compact Downlink Control Information (DCI) format for transmitting DCI for use in at least one of uplink (UL) or downlink (DL) transmissions by a first device of a first type, wherein the compact DCI format corresponds to at least one standard DCI format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCI format; and transmitting the DCI according to the compact DCI format.
29. A method for wireless communications by a first device of a first type, comprising:', 'receiving Downlink Control Information (DCI) according to a compact DCI format for use in at least one of uplink (UL) or downlink (DL) transmissions, wherein the compact DCI format corresponds to at least one standard DCI format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCI format; and', 'processing the received DCI.
30. The method of claim 29, wherein a device of the first type comprises reduced processing capability when compared to a device of the second type.
31. The method of claim 29, wherein the first device comprises a low cost User Equipment (UE).
32. The method of claim 29, wherein the DCI comprises:', 'DCI without bits allocated for resource allocation information, wherein the DCI allocates resources for one user at a time.
33. The method of claim 29, wherein the DCI comprises:', 'DCI for a limited set of resource allocation possibilities.
34. The method of claim 29, wherein DCI comprises:', 'DCI for a limited modulation and coding scheme (MCS).
35. The method of claim 34, wherein the limited MCS comprises Quadrature Phase Shift Keying (QPSK) only with a limited set of possible coding rates.
36. The method of claim 29, wherein the DCI comprises:', 'DCI for a limited set of Hybrid Automatic Repeat Request (HARQ) processes.
37. The method of claim 36, wherein the DCI lacks an indication of a HARQ process.
38. The method of claim 29, wherein the DCI comprises:', 'DCI without a bit allocated for differentiating between DCI formats 1 A and 0, wherein the DCI formats 1 A and 0 have different sizes.
39. The method of claim 29, wherein the DCI comprises:', 'a reduced length Cyclic Redundancy Check (CRC) for the DCI.
40. The method of claim 39, wherein the reduced length CRC comprises:', 'a CRC generated by generating a CRC of a first length and truncating the CRC of the first length to generate the reduced length CRC.
41. The method of claim 29, wherein the DCI comprises:', 'DCI without bits allocated for Redundancy Version (RV).
42. The method of claim 29, wherein the DCI comprises:', 'DCI without bits allocated for Sounding Reference Signal (SRS) request.
43. The method of claim 29, wherein the DCI comprises:', 'DCI with reduced bit-width for Transmitter Power Control (TPC).
44. The method of claim 29, wherein the DCI comprises:', 'DCI with reduced bit- width for Demodulation Reference Signal (DM-RS).
45. The method of claim 29, wherein the DCI comprises:', 'DCI without a bit allocated for multi-cluster flag.
46. The method of claim 29, wherein the DCI comprises:', 'DCI with aperiodic channel state information (CSI) if periodic CSI is not supported; and', 'DCI without aperiodic CSI if periodic CSI is supported.
47. The method of claim 29, wherein the DCI comprises:', 'DCI without a bit allocated for Virtual Resource Block assignment.
48. The method of claim 29, wherein the DCI comprises:', 'DCI without a bit allocated for frequency hopping flag.
49. The method of claim 29, wherein the DCI comprises:', 'DCI without a bit allocated for Downlink Assignment Index (DAI) and UL assignment index, wherein a one to one mapping is maintained between DL subframe and UL subframe for each UE.
50. The method of claim 29, wherein:', 'the DCI is transmitted using a set of resources selected from a limited set of decoding candidates; and', 'the method comprises performing blind decodes for the limited set of decoding candidates to detect a PDCCH containing the DCI.
51. An apparatus for wireless communications by a first device of a first type, comprising:', 'means for receiving Downlink Control Information (DCI) according to a compact DCI format for use in at least one of uplink (UL) or downlink (DL) transmissions, wherein the compact DCI format corresponds to at least one standard DCI format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCI format; and', 'means for processing the received DCI.
52. The apparatus of claim 51 , wherein a device of the first type comprises reduced processing capability when compared to a device of the second type.
53. The apparatus of claim 51 , wherein the first device comprises a low cost User Equipment (UE).
54. The apparatus of claim 51 , wherein:', 'the DCI is transmitted using a set of resources selected from a limited set of decoding candidates; and', 'the apparatus comprises means for performing blind decodes for the limited set of decoding candidates to detect a PDCCH containing the DCI.
55. An apparatus for wireless communications by a first device of a first type, comprising:', 'at least one processor configured to:', 'receive Downlink Control Information (DCI) according to a compact DCI format for use in at least one of uplink (UL) or downlink (DL)', 'transmissions, wherein the compact DCI format corresponds to at least one standard DCI format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCI format; and', 'process the received DCI, and', 'a memory coupled to the at least one processor.
56. A computer program product for wireless communications by a first device of a first type, comprising:', 'a computer-readable medium comprising code for: receiving Downlink Control Information (DCl) according to a compact DCl format for use in at least one of uplink (UL) or downlink (DL) transmissions, wherein the compact DCl format corresponds to at least one standard DCl format used by a second device of a second type and comprises a reduced number of bits when compared to the standard DCl format; and', 'processing the received DCL']
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