# US 2017/0290042 A1 · Scheduling request transmission to request resources for a buffer status report

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- Number: US 2017/0290042 A1
- Document ID: US20170290042A1
- Status: Published application
- Kind: A1
- Application number: 15/478,933
- Filed: 2017-04-04
- Published: 2017-10-05
- Earliest claimed: 2016-04-05
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Muhammad Nazmul Islam; Sundar Subramanian; Juergen Cezanne; Junyi Li; Ashwin Sampath; Tao Luo
- Web page: https://patentgrep.com/patent/US20170290042A1

## CPC

- H04L 5/0037: {Inter-user or inter-terminal allocation}
- H04W 72/52: based on load
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 72/20: Control channels or signalling for resource management
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A UE may receive a reference signal or directional synchronization subframe from a base station and transmit a scheduling request to the base station using a resource based on the reference signal or directional synchronization subframe. The scheduling request may enable a base station to grant the UE resources to send a buffer status report (BSR). The resource may be associated with a random access channel (RACH) time period. The UE may also transmit a scheduling request within a frequency region of the RACH time period. The scheduling request may be transmitted based on a received indication of a set of subcarrier, a cyclic shift, or a sequence index. In some examples, the resources used by the UE to send the BSR may include physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) resources.

## Claims

### Claim 1

A method for wireless communication, comprising:
receiving a reference signal from a base station;
identifying a resource for transmitting a scheduling request to the base station, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal; and
transmitting the scheduling request to the base station using the resource.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
receiving a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
transmitting the BSR to the base station using the resource indicated in the grant.

### Claim 3 (depends on 2)

The method of claim 2, wherein:
the resource indicated in the grant comprise physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 4 (depends on 1)

The method of claim 1, wherein:
the reference signal from the base station comprises one or more reference signals from a set of reference signals.

### Claim 5 (depends on 4)

The method of claim 4, further comprising:
identifying a reference signal from the set of reference signals, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal from the set of reference signals.

### Claim 6 (depends on 4)

The method of claim 4, wherein:
the reference signal from the set of reference signals is at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a demodulation reference signal (DMRS) for a physical broadcast channel (PBCH), a beam reference signal (BRS), channel state indicator reference signal (CSI-RS), a mobility reference signal (MRS), a cell specific reference signal (CRS), or a combination thereof.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
determining, based at least in part on the resource, at least one of a transmission time, a set of subcarriers, a cyclic shift, or a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 8 (depends on 1)

The method of claim 1, further comprising:
receiving, from the base station, at least one of a transmission time, a set of subcarriers, a cyclic shift, a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 9 (depends on 1)

The method of claim 1, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.

### Claim 10 (depends on 1)

The method of claim 1, wherein:
the scheduling request comprises a short PUCCH format.

### Claim 11 (depends on 1)

The method of claim 1, wherein:
the resource for transmitting the scheduling request is associated with a random access channel (RACH).

### Claim 12 (depends on 11)

The method of claim 11, further comprising:
identifying a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is transmitted using resources located within the frequency region associated with scheduling requests.

### Claim 13 (depends on 11)

The method of claim 11, further comprising:
identifying a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 14

A method for wireless communication, comprising:
transmitting a reference signal to a user equipment (UE); and
receiving a scheduling request from the UE using a resource selected by the UE based at least in part on the reference signal.

### Claim 15 (depends on 14)

The method of claim 14, further comprising:
transmitting a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
receiving the BSR from the UE using resources indicated in the grant.

### Claim 16 (depends on 15)

The method of claim 15, wherein:
the resources indicated in the grant comprises physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 17 (depends on 14)

The method of claim 14, wherein:
the resource for receiving the scheduling request is associated with a random access channel (RACH).

### Claim 18 (depends on 17)

The method of claim 17, further comprising:
identifying a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is received using resources located within the frequency region associated with scheduling requests.

### Claim 19 (depends on 17)

The method of claim 17, further comprising:
identifying a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 20 (depends on 14)

The method of claim 14, further comprising:
transmitting an indication of at least one of a cyclic shift, a set of subcarriers, or a sequence index to the UE, wherein the scheduling request is received using the cyclic shift, the set of subcarriers, the sequence index, or combinations thereof.

### Claim 21 (depends on 14)

The method of claim 14, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.

### Claim 22

An apparatus for wireless communication, comprising:
means for receiving a reference signal from a base station;
means for identifying a resource for transmitting a scheduling request to the base station, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal; and
means for transmitting the scheduling request to the base station using the resource.

### Claim 23 (depends on 22)

The apparatus of claim 22, further comprising:
means for receiving a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
means for transmitting the BSR to the base station using the resource indicated in the grant.

### Claim 24 (depends on 23)

The apparatus of claim 23, wherein:
the resource indicated in the grant comprise physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 25 (depends on 22)

The apparatus of claim 22, wherein:
the reference signal from the base station comprises one or more reference signals from a set of reference signals.

### Claim 26 (depends on 25)

The apparatus of claim 25, further comprising:
means for identifying a reference signal from the set of reference signals, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal from the set of reference signals.

### Claim 27 (depends on 25)

The apparatus of claim 25, wherein:
the reference signal from the set of reference signals is at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a demodulation reference signal (DMRS) for a physical broadcast channel (PBCH), a beam reference signal (BRS), channel state indicator reference signal (CSI-RS), a mobility reference signal (MRS), a cell specific reference signal (CRS), or a combination thereof.

### Claim 28 (depends on 22)

The apparatus of claim 22, further comprising:
means for determining, based at least in part on the resource, at least one of a transmission time, a set of subcarriers, a cyclic shift, or a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 29 (depends on 22)

The apparatus of claim 22, further comprising:
means for receiving, from the base station, at least one of a transmission time, a set of subcarriers, a cyclic shift, a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 30 (depends on 22)

The apparatus of claim 22, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.

### Claim 31 (depends on 22)

The apparatus of claim 22, wherein:
the scheduling request comprises a short PUCCH format.

### Claim 32 (depends on 22)

The apparatus of claim 22, wherein:
the resource for transmitting the scheduling request is associated with a random access channel (RACH).

### Claim 33 (depends on 32)

The apparatus of claim 32, further comprising:
means for identifying a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is transmitted using resources located within the frequency region associated with scheduling requests.

### Claim 34 (depends on 32)

The apparatus of claim 32, further comprising:
means for identifying a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 35

An apparatus for wireless communication, comprising:
means for transmitting a reference signal to a user equipment (UE); and
means for receiving a scheduling request from the UE using a resource selected by the UE based at least in part on the reference signal.

### Claim 36 (depends on 35)

The apparatus of claim 35, further comprising:
means for transmitting a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
means for receiving the BSR from the UE using resources indicated in the grant.

### Claim 37 (depends on 36)

The apparatus of claim 36, wherein:
the resources indicated in the grant comprises physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 38 (depends on 35)

The apparatus of claim 35, wherein:
the resource for receiving the scheduling request is associated with a random access channel (RACH).

### Claim 39 (depends on 38)

The apparatus of claim 38, further comprising:
means for identifying a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is received using resources located within the frequency region associated with scheduling requests.

### Claim 40 (depends on 38)

The apparatus of claim 38, further comprising:
means for identifying a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 41 (depends on 35)

The apparatus of claim 35, further comprising:
means for transmitting an indication of at least one of a cyclic shift, a set of subcarriers, or a sequence index to the UE, wherein the scheduling request is received using the cyclic shift, the set of subcarriers, the sequence index, or combinations thereof.

### Claim 42 (depends on 35)

The apparatus of claim 35, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.

### Claim 43

An apparatus for wireless communication, in a system comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive a reference signal from a base station;
identify a resource for transmitting a scheduling request to the base station, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal; and
transmit the scheduling request to the base station using the resource.

### Claim 44 (depends on 43)

The apparatus of claim 43, wherein the instructions are further executable by the processor to:
receive a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
transmit the BSR to the base station using the resource indicated in the grant.

### Claim 45 (depends on 44)

The apparatus of claim 44, wherein:
the resource indicated in the grant comprise physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 46 (depends on 43)

The apparatus of claim 43, wherein:
the reference signal from the base station comprises one or more reference signals from a set of reference signals.

### Claim 47 (depends on 46)

The apparatus of claim 46, wherein the instructions are further executable by the processor to:
identify a reference signal from the set of reference signals, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal from the set of reference signals.

### Claim 48 (depends on 46)

The apparatus of claim 46, wherein:
the reference signal from the set of reference signals is at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a demodulation reference signal (DMRS) for a physical broadcast channel (PBCH), a beam reference signal (BRS), channel state indicator reference signal (CSI-RS), a mobility reference signal (MRS), a cell specific reference signal (CRS), or a combination thereof.

### Claim 49 (depends on 43)

The apparatus of claim 43, wherein the instructions are further executable by the processor to:
determine, based at least in part on the resource, at least one of a transmission time, a set of subcarriers, a cyclic shift, or a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 50 (depends on 43)

The apparatus of claim 43, wherein the instructions are further executable by the processor to:
receive, from the base station, at least one of a transmission time, a set of subcarriers, a cyclic shift, a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 51 (depends on 43)

The apparatus of claim 43, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.

### Claim 52 (depends on 43)

The apparatus of claim 43, wherein:
the scheduling request comprises a short PUCCH format.

### Claim 53 (depends on 43)

The apparatus of claim 43, wherein:
the resource for transmitting the scheduling request is associated with a random access channel (RACH).

### Claim 54 (depends on 53)

The apparatus of claim 53, wherein the instructions are further executable by the processor to:
identify a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is transmitted using resources located within the frequency region associated with scheduling requests.

### Claim 55 (depends on 53)

The apparatus of claim 53, wherein the instructions are further executable by the processor to:
identify a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 56

An apparatus for wireless communication, in a system comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
transmit a reference signal to a user equipment (UE); and
receive a scheduling request from the UE using a resource selected by the UE based at least in part on the reference signal.

### Claim 57 (depends on 56)

The apparatus of claim 56, wherein the instructions are further executable by the processor to:
transmit a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
receive the BSR from the UE using resources indicated in the grant.

### Claim 58 (depends on 57)

The apparatus of claim 57, wherein:
the resources indicated in the grant comprises physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 59 (depends on 56)

The apparatus of claim 56, wherein:
the resource for receiving the scheduling request is associated with a random access channel (RACH).

### Claim 60 (depends on 59)

The apparatus of claim 59, wherein the instructions are further executable by the processor to:
identify a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is received using resources located within the frequency region associated with scheduling requests.

### Claim 61 (depends on 59)

The apparatus of claim 59, wherein the instructions are further executable by the processor to:
identify a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 62 (depends on 56)

The apparatus of claim 56, wherein the instructions are further executable by the processor to:
transmit an indication of at least one of a cyclic shift, a set of subcarriers, or a sequence index to the UE, wherein the scheduling request is received using the cyclic shift, the set of subcarriers, the sequence index, or combinations thereof.

### Claim 63 (depends on 56)

The apparatus of claim 56, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.

### Claim 64

A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:
receive a reference signal from a base station;
identify a resource for transmitting a scheduling request to the base station, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal; and
transmit the scheduling request to the base station using the resource.

### Claim 65 (depends on 64)

The non-transitory computer-readable medium of claim 64, wherein the instructions are further executable by the processor to:
receive a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
transmit the BSR to the base station using the resource indicated in the grant.

### Claim 66 (depends on 65)

The non-transitory computer-readable medium of claim 65, wherein:
the resource indicated in the grant comprise physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 67 (depends on 64)

The non-transitory computer-readable medium of claim 64, wherein:
the reference signal from the base station comprises one or more reference signals from a set of reference signals.

### Claim 68 (depends on 67)

The non-transitory computer-readable medium of claim 67, wherein the instructions are further executable by the processor to:
identify a reference signal from the set of reference signals, wherein the resource for transmitting the scheduling request is based at least in part on the reference signal from the set of reference signals.

### Claim 69 (depends on 67)

The non-transitory computer-readable medium of claim 67, wherein:
the reference signal from the set of reference signals is at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a demodulation reference signal (DMRS) for a physical broadcast channel (PBCH), a beam reference signal (BRS), channel state indicator reference signal (CSI-RS), a mobility reference signal (MRS), a cell specific reference signal (CRS), or a combination thereof.

### Claim 70 (depends on 64)

The non-transitory computer-readable medium of claim 64, wherein the instructions are further executable by the processor to:
determine, based at least in part on the resource, at least one of a transmission time, a set of subcarriers, a cyclic shift, or a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 71 (depends on 64)

The non-transitory computer-readable medium of claim 64, wherein the instructions are further executable by the processor to:
receive, from the base station, at least one of a transmission time, a set of subcarriers, a cyclic shift, a sequence index, wherein the scheduling request is transmitted using the transmission time, the set of subcarriers, the cyclic shift, the sequence index, or a combination thereof.

### Claim 72 (depends on 64)

The non-transitory computer-readable medium of claim 64, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.

### Claim 73 (depends on 64)

The non-transitory computer-readable medium of claim 64, wherein:
the scheduling request comprises a short PUCCH format.

### Claim 74 (depends on 64)

The non-transitory computer-readable medium of claim 64, wherein:
the resource for transmitting the scheduling request is associated with a random access channel (RACH).

### Claim 75 (depends on 74)

The non-transitory computer-readable medium of claim 74, wherein the instructions are further executable by the processor to:
identify a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is transmitted using resources located within the frequency region associated with scheduling requests.

### Claim 76 (depends on 74)

The non-transitory computer-readable medium of claim 74, wherein the instructions are further executable by the processor to:
identify a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 77

A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:
transmit a reference signal to a user equipment (UE); and
receive a scheduling request from the UE using a resource selected by the UE based at least in part on the reference signal.

### Claim 78 (depends on 77)

The non-transitory computer-readable medium of claim 77, wherein the instructions are further executable by the processor to:
transmit a grant for transmitting a buffer status report (BSR) in response to the scheduling request; and
receive the BSR from the UE using resources indicated in the grant.

### Claim 79 (depends on 78)

The non-transitory computer-readable medium of claim 78, wherein:
the resources indicated in the grant comprises physical uplink shared channel (PUSCH) resources, physical uplink control channel (PUCCH) resources, or both.

### Claim 80 (depends on 77)

The non-transitory computer-readable medium of claim 77, wherein:
the resource for receiving the scheduling request is associated with a random access channel (RACH).

### Claim 81 (depends on 80)

The non-transitory computer-readable medium of claim 80, wherein the instructions are further executable by the processor to:
identify a frequency region associated with the RACH and a frequency region associated with scheduling requests that does not overlap with the frequency region associated with the RACH, wherein the scheduling request is received using resources located within the frequency region associated with scheduling requests.

### Claim 82 (depends on 80)

The non-transitory computer-readable medium of claim 80, wherein the instructions are further executable by the processor to:
identify a cyclic prefix length for the scheduling request, wherein the cyclic prefix length comprises a long cyclic prefix length associated with the RACH or a short cyclic prefix length associated with non-RACH transmissions.

### Claim 83 (depends on 77)

The non-transitory computer-readable medium of claim 77, wherein the instructions are further executable by the processor to:
transmit an indication of at least one of a cyclic shift, a set of subcarriers, or a sequence index to the UE, wherein the scheduling request is received using the cyclic shift, the set of subcarriers, the sequence index, or combinations thereof.

### Claim 84 (depends on 77)

The non-transitory computer-readable medium of claim 77, wherein:
the scheduling request comprises a sequence repeated a plurality of times over a plurality of symbol periods.