# US 2021/0243766 A1 · Bandwidth Part Switching Delay for Uplink Transmission

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- Number: US 2021/0243766 A1
- Document ID: US20210243766A1
- Status: Published application
- Kind: A1
- Application number: 17/250,652
- Filed: 2019-08-19
- Published: 2021-08-05
- Earliest claimed: 2018-08-20
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Yuhan ZHOU; Jie CUI; Yang TANG; Hua LI; Rui HUANG
- Web page: https://patentgrep.com/patent/US20210243766A1

## CPC

- H04W 72/53: based on regulatory allocation policies
- H04W 36/06: Reselecting a communication resource in the serving access point
- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

An apparatus of a user equipment (UE) comprises one or more baseband processors to process a bandwidth part (BWP) switching request from a serving cell at slot n, and to perform an active BWP switch to a new BWP on the serving cell at a time no later than slot n+Y, wherein Y is a BWP switching delay. The one or more baseband processors are to accommodate a timing advance (TA) value to determine when to perform the active BWP switch. The apparatus can include a memory to store the BWP switching request.

## Claims

### Claim 1

An apparatus of a user equipment (UE), comprising:
one or more baseband processors to process a bandwidth part (BWP) switching request from a serving cell at slot n, and to perform an active BWP switch to a new BWP on the serving cell at a time no later than slot n+Y, wherein Y is a BWP switching delay;
wherein the one or more baseband processors are to accommodate a timing advance (TA) value to determine when to perform the active BWP switch; and
a memory to store the BWP switching request.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the one or more baseband processors are to receive a physical downlink shared channel (PDSCH) for the downlink (DL) at a slot offset in time by the TA value with respect to the uplink (UL).

### Claim 3 (depends on 1, 2)

The apparatus of any one of claims 1-2, wherein the one or more baseband process are to transmit a physical uplink shared channel (PUSCH) for the uplink (UL) at a slot advanced in time by the TA value with respect to the downlink (DL).

### Claim 4

The apparatus of a user equipment (UE), comprising:
one or more baseband processors to process a bandwidth part (BWP) switching request from a serving cell at slot m, and to perform an active BWP switch to transmit a physical uplink shared channel (PUSCH) in the uplink (UL) on a new BWP on the serving cell at a time no later than slot m+Y, wherein Y is a BWP switching delay;
wherein downlink slots are offset by a timing advance (TA) value with respect to UL slots, and the one or more baseband processors are to accommodate the TA value to determine when to perform the active BWP switch; and
a memory to store the BWP switching request.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein an end of a last symbol of a physical downlink control channel (PDCCH) carrying the active BWP switch downlink control information (DCI) in the DL is within slot m.

### Claim 6 (depends on 4, 5)

The apparatus of any one of claims 4-5, wherein the one or more baseband processors are to start the BWP switch at slot m+1 when an end of a last symbol of a physical downlink control channel (PDCCH) carrying the active BWP switch downlink control information (DCI) in the DL is aligned with a boundary between slot m and slot m+1.

### Claim 7 (depends on 4, 5, 6)

The apparatus of any one of claims 4-6, wherein the one or more baseband processors are to start the BWP switch at UL slot m, where m is the beginning of a subframe (FR1) or a half-subframe (FR2) immediately after a BWP-inactivity timer expires on the serving cell for a timer-based BWP switch in the UL.

### Claim 8

An apparatus of a user equipment, comprising:
one or more baseband processors to process a bandwidth part (BWP) switching request from a serving cell at slot n, and to perform an active BWP switch to a new BWP on the serving cell at a time no later than slot n+Y, wherein Y is a BWP switching delay;
wherein the one or more baseband processors are to accommodate a timing advance (TA) value to determine when to perform the active BWP switch, and to start the BWP switch at slot n for the downlink (DL); and
a memory to store the BWP switching request.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein the one or more baseband processors are to receive a downlink physical shared channel (PDSCH) on the new BWP on the serving cell no later than at slot n+Y.

### Claim 10 (depends on 8, 9)

The apparatus of any one of claims 8-9, wherein the one or more baseband processors are to transmit a physical uplink shared channel (PUSCH) on the new BWP on the serving cell no later than at slot n+X, where X=Ceil(Y+TA) in slot units, wherein Ceil(⋅) is a ceiling function.

### Claim 11

One or more machine readable media having instructions stored thereon that, when executed by an apparatus of a user equipment (UE), result in:
processing a bandwidth part (BWP) switching request from a serving cell at slot n;
performing an active BWP switch to a new BWP on the serving cell at a time no later than slot n+Y, wherein Y is a BWP switching delay; and
accommodating a timing advance (TA) value to determine when to perform the active BWP switch.

### Claim 12 (depends on 11)

The one or more machine readable media of claim 11, wherein the instructions, when executed, further result in receiving a physical downlink shared channel (PDSCH) for the downlink (DL) at a slot offset in time by the TA value with respect to the uplink (UL).

### Claim 13 (depends on 11, 12)

The one or more machine readable media of any one of claims 11-12, wherein the instructions, when executed, further result in transmitting a physical uplink shared channel (PUSCH) for the uplink (UL) at a slot advanced in time by the TA value with respect to the downlink (DL).

### Claim 14

One or more machine readable media having instructions stored thereon that, when executed by apparatus of a user equipment (UE), result in:
processing a bandwidth part (BWP) switching request from a serving cell at slot m;
performing an active BWP switch to transmit a physical uplink shared channel (PUSCH) in the uplink (UL) on a new BWP on the serving cell at a time no later than slot m+Y, wherein Y is a BWP switching delay, wherein downlink slots are offset by a timing advance (TA) value with respect to UL slots; and
accommodating the TA value to determine when to perform the active BWP switch.

### Claim 15 (depends on 14)

The one or more machine readable media of claim 14, wherein an end of a last symbol of a physical downlink control channel (PDCCH) carrying the active BWP switch downlink control information (DCI) in the DL is within slot m.

### Claim 16 (depends on 14, 15)

The one or more machine readable media of any one of claims 14-15, wherein the instructions, when executed, further result in starting the BWP switch at slot m+1 when an end of a last symbol of a physical downlink control channel (PDCCH) carrying the active BWP switch downlink control information (DCI) in the DL is aligned with a boundary between slot m and slot m+1.

### Claim 17 (depends on 14, 15, 16)

The one or more machine readable media of any one of claims 14-16, wherein the instructions, when executed, further result in starting the BWP switch at UL slot m, where m is the beginning of a subframe (FR1) or a half-subframe (FR2) immediately after a BWP-inactivity timer expires on the serving cell for a timer-based BWP switch in the UL.

### Claim 18

One or more machine readable media having instructions stored thereon that, when executed by apparatus of a user equipment (UE), result in:
processing a bandwidth part (BWP) switching request from a serving cell at slot n, and to perform an active BWP switch to a new BWP on the serving cell at a time no later than slot n+Y, wherein Y is a BWP switching delay;
accommodating a timing advance (TA) value to determine when to perform the active BWP switch; and
starting the BWP switch at slot n for the downlink (DL).

### Claim 19 (depends on 18)

The one or more machine readable media of claim 18, wherein the instructions, when executed, further result in receiving a downlink physical shared channel (PDSCH) on the new BWP on the serving cell no later than at slot n+Y.

### Claim 20 (depends on 18, 19)

The one or more machine readable media of any one of claims 18-19, wherein the instructions, when executed, further result in transmitting a physical uplink shared channel (PUSCH) on the new BWP on the serving cell no later than at slot n+X, where X=Ceil(Y+TA) in slot units, wherein Ceil(⋅) is a ceiling function.