Search

EP-4327470-B1 - BEAM FAILURE DETECTION IN FULL-DUPLEX OPERATION

EP4327470B1EP 4327470 B1EP4327470 B1EP 4327470B1EP-4327470-B1

Inventors

  • ZHENG, RUIMING
  • ABDELGHAFFAR, MUHAMMAD SAYED KHAIRY
  • HE, LINHAI
  • XU, HUILIN
  • IBRAHIM, Abdelrahman Mohamed Ahmed Mohamed
  • ABOTABL, Ahmed Attia
  • MUKKAVILLI, KRISHNA KIRAN
  • KWON, HWAN JOON

Dates

Publication Date
20260506
Application Date
20210420

Claims (15)

  1. A user equipment, UE, (1300) for wireless communication, the UE comprising: a memory; and one or more processors, coupled to the memory, configured to: receive, from a base station, a beam failure detection, BFD, reference signal set in one or more slots in a full-duplex mode and in one or more slots in a half-duplex mode; detect beam failure due to self-interference based at least in part on a comparison of measurements of the BFD reference signal set in the full-duplex mode and half-duplex mode; and switch from the full-duplex mode to the half-duplex mode for slots configured for the full-duplex mode based at least in part on detecting beam failure due to self-interference.
  2. The UE of claim 1, wherein the one or more processors are further configured to: receive, from the base station, a BFD resource configuration that indicates BFD reference signal resources for the BFD reference signal set, wherein the BFD reference signal resources are configured with a same frequency domain resource allocation in the one or more slots in the full-duplex mode as a frequency domain resource allocation in the one or more slots in the half-duplex mode, wherein the BFD resource configuration further indicates a beam failure threshold, a beam failure instance counter threshold, a BFD timer duration associated with the beam failure instance counter, and BFR resources for requesting BFR.
  3. The UE of claim 1, wherein the one or more processors, to detect beam failure due to self-interference, are configured to: compare a first beam measurement performed on the BFD reference signal set in the full-duplex mode and a second beam measurement performed on the BFD reference signal set in the half-duplex mode; and detect whether the beam failure is due to self-interference based at least in part on a determination of whether a difference between the first beam measurement and the second beam measurement satisfies a threshold, wherein the first beam measurement is a first signal-to-interference-plus-noise ratio, SINR, measurement and the second beam measurement is a second SINR measurement.
  4. The UE of claim 1, wherein the one or more processors are further configured to: transmit, to the base station and based at least in part on switching from the full-duplex mode to the half-duplex mode, a message including an indication that the UE has switched from the full-duplex mode to the half-duplex mode.
  5. The UE of claim 4, wherein the message further includes an indication of whether to drop uplink communications or downlink communications from the slots configured for the full-duplex mode.
  6. The UE of claim 4, wherein the one or more processors are further configured to: receive, from the base station and based at least in part on transmitting the message, an indication of a new beam configured for the UE.
  7. A user equipment, UE, (1300) for wireless communication, the UE comprising: a memory; and one or more processors, coupled to the memory, configured to: receive, from a base station, a first beam failure detection, BFD, reference signal set in one or more slots in a full-duplex mode, and a second BFD reference signal set in one or more slots in a half-duplex mode; detect beam failure in the full-duplex mode based at least in part on the first BFD reference signal set; detect a cause of the beam failure in the full-duplex mode based at least in part on measurements of the first BFD reference signal set in the full-duplex mode and measurements of the second BFD reference signal set in the half-duplex mode; and transmit, to the base station in a beam failure recovery, BFR, medium access control, MAC, control element, MAC-CE, an indication of the cause of the beam failure.
  8. The UE of claim 7, wherein the one or more processors are further configured to: detect beam failure instances in the full-duplex mode based at least in part on the first BFD reference signal set; and increment a first beam failure instance counter for each beam failure instance detected in the full-duplex mode, wherein detecting beam failure in the full-duplex mode is based at least in part on the first beam failure instance counter satisfying a first threshold within a first BFD timer duration.
  9. The UE of claim 7, wherein the one or more processors are further configured to: detect beam failure instances in the half-duplex mode based at least in part on the second BFD reference signal set; increment a second beam failure instance counter for each beam failure instance detected in the half-duplex mode; and detect beam failure in the half-duplex mode based at least in part on the second beam failure instance counter satisfying a second threshold within a second BFD timer duration.
  10. The UE of claim 7, wherein the one or more processors, to detect the cause of the beam failure in the full-duplex mode, are configured to: detect, based at least in part on the measurements of the first BFD reference signal set in the full-duplex mode and the measurements of the second BFD reference signal set in the half-duplex mode, that the cause of the beam failure in the full-duplex mode is one of a first cause associated with degraded link quality or a second cause associated with self-interference, wherein the indication is one of a first indication associated with the first cause or a second indication associated with the second cause, and wherein the indication is included in a bit field in the BFR MAC-CE.
  11. The UE of claim 10, wherein the one or more processors are further configured to: receive, from the base station and based at least in part on transmitting the first indication in the BFR MAC-CE, an indication of a new beam configured for the UE.
  12. The UE of claim 10, wherein the one or more processors are further configured to: receive, from the base station and based at least in part on transmitting the second indication in the BFR MAC-CE, an indication for the UE to switch from the full-duplex mode to the half-duplex mode for slots configured for the full-duplex mode.
  13. The UE of claim 10, wherein the one or more processors are further configured to: receive, from the base station and based at least in part on transmitting the second indication in the BFR MAC-CE, an indication of a new beam configured for the UE for communications with the base station in the full-duplex mode.
  14. A method (1000) of wireless communication performed by a user equipment, UE, the method (1000) comprising: receiving (1010), from a base station, a beam failure detection, BFD, reference signal set in one or more slots in a full-duplex mode and in one or more slots in a half-duplex mode; detecting (1020) beam failure due to self-interference based at least in part on a comparison of measurements of the BFD reference signal set in the full-duplex mode and half-duplex mode; and switching (1030) from the full-duplex mode to the half-duplex mode for slots configured for the full-duplex mode based at least in part on detecting beam failure due to self-interference.
  15. A method (1100) of wireless communication performed by a user equipment, UE, the method (1100) comprising: receiving (1110), from a base station, a first beam failure detection, BFD, reference signal set in one or more slots in a full-duplex mode, and a second BFD reference signal set in one or more slots in a half-duplex mode; detecting (1120) beam failure in the full-duplex mode based at least in part on the first BFD reference signal set; detecting (1130) a cause of the beam failure in the full-duplex mode based at least in part on measurements of the first BFD reference signal set in the full-duplex mode and measurements of the second BFD reference signal set in the half-duplex mode; and transmitting (1140), to the base station in a beam failure recovery, BFR, medium access control, MAC, control element, MAC-CE, an indication of the cause of the beam failure.

Description

BACKGROUND Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or the like). Examples of such multiple-access technologies 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 (3GPP). A wireless network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A UE may communicate with a BS via the downlink and uplink. "Downlink" (or "forward link") refers to the communication link from the BS to the UE, and "uplink" (or "reverse link") refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) BS, a 5G Node B, or the like. WO 2020/140026 A1 relates to techniques and apparatuses for a beam recovery procedure for full duplex operation. The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. NR, which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as 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. SUMMARY Aspects of the invention are defined in the claims. In the following, each of the described methods, apparatuses, examples, and aspects which do not fully correspond to the invention as defined in the claims is thus not according to the invention and is, as well as the whole following description, present for illustration purposes only or to highlight specific aspects or features of the claims. BRIEF DESCRIPTION OF THE DRAWINGS So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements. Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with the present disclosure.Fig. 2 is a diagram illustrating an example of a base station in communication with a user equipment (UE) in a wireless network, in accordance with the present disclosure.Fig. 3 is a diagram illustrating an example of beam failure detection (BFD) and beam failure recovery (BFR), in accordance with the present disclosure.Fig. 4 is a diagram illustrating an example of BFR for a secondary cell (Scell), in accordance with the present disclosure.Fig. 5 is a diagram illustrating examples of full-duplex communication in a wireless network, in accordance with the present disclosure.Fig. 6 is a diagram illustrating an example of a slot format for sub-band full-duplex communication, in accordance with the present disclosure.Figs. 7-8 are diagrams illustrating examples associated with BFD in full-duplex operation, in accordance with the present disclosure.Fig. 9 is a diagram illustrating a process associated with performing BFD in a full-duplex mode and a half-duplex mode.Figs. 10-12 are diagrams illustrating example processes associated with BFD in full-duplex operation, in accordance with the present disclosure.