CN-122029912-A - Uplink transmission handover at user equipment

Abstract

Various aspects of the present disclosure relate generally to wireless communications. In some aspects, a User Equipment (UE) may receive a configuration associated with an uplink transmit (Tx) handover indicating a first Tx parameter or a second Tx parameter, wherein a target frequency band is associated with one port and a concurrent Tx frequency band is not defined. The UE may perform an uplink Tx switch based at least in part on the configuration, wherein a first Tx chain of the UE switches to a target frequency band, and a second Tx chain of the UE remains on a source frequency band, switches to a highest priority frequency band of a combination of frequency bands, switches to a frequency band based at least in part on a network indication, or switches to a target frequency band. Numerous other aspects are described.

Inventors

• CAO YIQING
• P. Garr
• K. Bamboo field

Assignees

• 高通股份有限公司

Dates

Publication Date

20260512

Application Date

20231018

Claims (20)

1. 1. An apparatus for wireless communication at a User Equipment (UE), the apparatus comprising: One or more memories, and One or more processors coupled to the one or more memories and configured to cause the UE to: receiving a configuration associated with an uplink transmit (Tx) handoff, the configuration indicating either a first Tx parameter or a second Tx parameter, wherein a target band is associated with one port and a concurrent Tx band is not defined, and An uplink Tx switch is performed based at least in part on the configuration, wherein a first Tx chain of the UE switches to the target frequency band, and a second Tx chain of the UE remains on a source frequency band, switches to a highest priority frequency band of a combination of frequency bands, switches to a frequency band based at least in part on a network indication, or switches to the target frequency band.
2. 2. The apparatus of claim 1, wherein the configuration is an uplink Tx switched dual uplink Tx state configuration, the first Tx parameter is one Tx parameter, the second Tx parameter is two Tx parameters, and the target band is associated with only one port.
3. 3. The apparatus of claim 1, wherein the target frequency band is associated with non-concurrent transmissions based at least in part on a network schedule.
4. 4. The apparatus of claim 1, wherein the target frequency band is associated with non-two layer transmissions based at least in part on a network schedule.
5. 5. The apparatus of claim 1, wherein: The uplink Tx switch is from a first frequency band to a third frequency band, the first frequency band being associated with the first Tx chain and the second Tx chain, the first frequency band being the source frequency band and the third frequency band being the target frequency band and being only one port, or The uplink Tx handover is from the first frequency band associated with the first Tx chain and the second frequency band associated with the second Tx chain to the third frequency band, the first and second frequency bands being source frequency bands and the third frequency band being the target frequency band and being only one port.
6. 6. The apparatus of claim 5, wherein the first Tx parameter is configured, the first Tx chain switches to the third frequency band, and the second Tx chain remains on the first frequency band.
7. 7. The apparatus of claim 5, wherein the first Tx parameter is configured, the first Tx chain switches to the third frequency band, and the second Tx chain remains on the first frequency band or the second frequency band, or the second Tx chain remains on a higher priority frequency band of the first frequency band and the second frequency band.
8. 8. The apparatus of claim 5, wherein the first Tx parameter is configured, the first Tx chain is switched to the third frequency band, and the second Tx chain is switched to the highest priority frequency band of the combination of frequency bands.
9. 9. The apparatus of claim 5, wherein the first Tx parameter is configured and the one or more processors are further configured to cause the UE to: the network indication is received via radio resource control signaling.
10. 10. The apparatus of claim 5, wherein the second Tx parameter is configured, the first Tx chain switches to the third frequency band, and the second Tx chain remains on the first frequency band.
11. 11. The apparatus of claim 5, wherein the second Tx parameter is configured, the first Tx chain switches to the third frequency band, and the second Tx chain remains on the first frequency band or the second frequency band, or the second Tx chain remains on a higher priority frequency band of the first frequency band and the second frequency band.
12. 12. The apparatus of claim 5, wherein the second Tx parameter is configured, the first Tx chain is switched to the third frequency band, and the second Tx chain is switched to the highest priority frequency band of the combination of frequency bands.
13. 13. The apparatus of claim 5, wherein the second Tx parameter is configured and the one or more processors are further configured to cause the UE to: the network indication is received via radio resource control signaling.
14. 14. The apparatus of claim 5, wherein the second Tx parameter is configured, the first Tx chain and the second Tx chain switch to the third frequency band, and only one port is scheduled on the third frequency band.
15. 15. A method of wireless communication performed by a User Equipment (UE), the method comprising: receiving a configuration associated with an uplink transmit (Tx) handoff, the configuration indicating either a first Tx parameter or a second Tx parameter, wherein a target band is associated with one port and a concurrent Tx band is not defined, and An uplink Tx switch is performed based at least in part on the configuration, wherein a first Tx chain of the UE switches to the target frequency band, and a second Tx chain of the UE remains on a source frequency band, switches to a highest priority frequency band of a combination of frequency bands, switches to a frequency band based at least in part on a network indication, or switches to the target frequency band.
16. 16. The method of claim 15, wherein the configuration is an uplink Tx switched dual uplink Tx state configuration, the first Tx parameter is one Tx parameter, the second Tx parameter is two Tx parameters, and the target band is associated with only one port.
17. 17. The method of claim 15, wherein the target frequency band is associated with non-concurrent transmissions based at least in part on a network schedule.
18. 18. The method of claim 15, wherein the target frequency band is associated with non-two layer transmissions based at least in part on a network schedule.
19. 19. The method according to claim 15, wherein: The uplink Tx switch is from a first frequency band to a third frequency band, the first frequency band being associated with the first Tx chain and the second Tx chain, the first frequency band being the source frequency band and the third frequency band being the target frequency band and being only one port, or The uplink Tx handover is from the first frequency band associated with the first Tx chain and the second frequency band associated with the second Tx chain to the third frequency band, the first and second frequency bands being source frequency bands and the third frequency band being the target frequency band and being only one port.
20. 20. The method of claim 19 wherein the first Tx parameter is configured, the first Tx chain switches to the third frequency band, and the second Tx chain remains on the first frequency band.

Description

Uplink transmission handover at user equipment Technical Field Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatuses for uplink transmission (Tx) handover at a User Equipment (UE). Background Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the third generation partnership project (3 GPP). A wireless network may include one or more network nodes that support communications for wireless communication devices, such as User Equipment (UE) or multiple UEs. The UE may communicate with the network node via downlink and uplink communications. "downlink" (or "DL") refers to the communication link from the network node to the UE, and "uplink" (or "UL") refers to the communication link from the UE to the network node. Some wireless networks may support device-to-device communications, such as via local links (e.g., side Link (SL), wireless Local Area Network (WLAN) link, and/or Wireless Personal Area Network (WPAN) link, etc.). The multiple access techniques described above have been employed in various telecommunications standards to provide a common protocol that enables different UEs to communicate at a city, country, region, and/or global level. The New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3 GPP. NR is designed to better support mobile broadband internet access by improving spectral efficiency, reducing costs, improving services, exploiting new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the downlink (CP-OFDM), CP-OFDM and/or single carrier frequency division multiplexing (SC-FDM) on the uplink (also known as discrete fourier transform spread OFDM (DFT-s-OFDM)) for better integration with other open standards, and supporting beamforming, multiple Input Multiple Output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR and other radio access technologies remain useful. Disclosure of Invention In some implementations, an apparatus for wireless communication at a User Equipment (UE) includes one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the UE to receive a configuration associated with an uplink transmit (Tx) handover indicating a first Tx parameter or a second Tx parameter, wherein a target band is associated with one port and a concurrent Tx band is not defined, and perform an uplink Tx handover based at least in part on the configuration, wherein a first Tx chain of the UE is handed over to the target band and a second Tx chain of the UE remains on the source band, is handed over to a highest priority band in a band combination, is handed over to the band, or is handed over to the target band based at least in part on a network indication. In some implementations, a method of wireless communication performed by a UE includes receiving a configuration associated with an uplink Tx handover, the configuration indicating a first Tx parameter or a second Tx parameter, wherein a target band is associated with one port and a concurrent Tx band is not defined, and performing the uplink Tx handover based at least in part on the configuration, wherein a first Tx chain of the UE is handed over to the target band and a second Tx chain of the UE remains on a source band, is handed over to a highest priority band of a combination of bands, is handed over to a band based at least in part on a network indication, or is handed over to the target band. In some implementations, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to receive a configuration associated with an uplink Tx switch, the configuration indicating a first Tx parameter or a second Tx parameter, wherein a target frequency band is associated with one port and a concurrent Tx frequency ban