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EP-3942864-B1 - HANDOVER ENHANCEMENT WITH SIMULTANEOUS UE TRANSMISSION BEAMS

EP3942864B1EP 3942864 B1EP3942864 B1EP 3942864B1EP-3942864-B1

Inventors

  • CUI, JIE
  • YU, ZHIBIN
  • TANG, YANG
  • LI, QIMING
  • XU, QING

Dates

Publication Date
20260513
Application Date
20200430

Claims (9)

  1. A method performed by a user equipment, UE, the method comprising: transmitting two transmission, Tx, streams to different base stations simultaneously, wherein the two Tx streams are transmitted by two distinct Tx polarization circuitries within a same UE antenna panel circuity as two Tx polarizations wherein at least one of the two distinct Tx polarizations is configured with a narrow beam; calculating the transmission power for the two Tx streams separately; and applying a 3dB down-scaling of a maximal transmission power limit for each calculated transmission power.
  2. The method of claim 1, wherein the two Tx polarizations are configured with independent Tx beam patterns, each associated with a different reception, Rx, beam pattern from one of two different base stations.
  3. The method of claim 2, wherein one base station is a serving base station and another base station is a handover targeting base station.
  4. The method of claim 1, wherein each Tx stream is associated with one of two base stations.
  5. The method of claim 1, wherein each Tx stream is associated with one Tx polarization.
  6. The method of claim 1, wherein each of TX stream is associated with both TX polarizations.
  7. The method of any preceding claim, further comprising: determining a phase offset setting between the two Tx polarizations based on uplink, UL, interference measurements.
  8. A user equipment, UE, comprising: an antenna panel having two transmission polarization circuitries each having one or more antenna wherein at least one of the two transmission polarization circuitries is configured with a narrow beam; and baseband circuitry configured to independently feed two independent transmission streams to the transmission polarization circuitries, wherein the antenna panel is configured to form two different transmission beam patterns each directed to a different base station and the two transmission polarization circuitries are configured to transmit the two transmission streams to the different base stations simultaneously as two transmission polarizations, the UE being further configured to : calculate the transmission power for the two transmission streams separately; and apply a 3dB down-scaling of a maximal transmission power limit for each calculated transmission power.
  9. The UE of claim 8, wherein one base station is a serving base station and another base station is a handover targeting base station.

Description

Background Handover enhancement may reduce the interruption during handover, which can improve the throughput for the whole network. In Frequency Range 2 (FR2), the UE may use different reception (Rx) and/or transmission (Tx) beams for a serving cell and a target cell during handover. The UE is to keep a connection with the serving cell and the target cell simultaneously without interruption. However, for a UE that support a single active antenna panel, the UE cannot steer two beams simultaneously. The following documents are relevant: WO 2018/044693 A1 which discusses maintaining a source eNB connection during handover, WO 2013/056854 A1 which discusses handover for an intermediate node in a wireless communication network and US 2008/220808 A1 which discusses communications handoff using an adaptive antenna. Summary The essential features of the invention are defined by the appended independent claims Other exemplary embodiments that do not fall within the scope of the claims are deemed useful to understand the invention and hence discussed below, although they are not part of the invention. Some exemplary embodiments relate to a method performed by a user equipment (UE). The method includes transmitting two transmission (Tx) streams simultaneously, wherein the two Tx streams are transmitted by two distinct Tx polarization circuitries within a same UE antenna panel circuity as two Tx polarizations. Further exemplary embodiments relate to a method performed by a user equipment. The method includes identifying a first signal, identifying a second signal, transmitting the first signal in a first direction using a first polarization of an antenna panel and transmitting the second signal in a second direction using a second polarization of the antenna panel. Still other exemplary embodiments relate to a user equipment (UE) that has an antenna panel and baseband circuitry. The antenna panel has two transmission polarization circuitries each having one or more antenna. The baseband circuitry is configured to independently feed two independent transmission streams to the transmission polarization circuitries. The antenna panel is further configured to form two different transmission beam patterns each directed to a different base station. Brief Description of the Drawings Figure 1 illustrates an example architecture of a system of a network in accordance with various exemplary embodiments.Figure 2 illustrates an example architecture of a system including a first core network (CN) in accordance with various exemplary embodiments.Figure 3 an architecture of a system including a second CN in accordance with various exemplary embodiments.Figure 4 illustrates an example of infrastructure equipment in accordance with various exemplary embodiments.Figure 5 illustrates an example of a platform in accordance with various exemplary embodiments.Figure 6 illustrates example components of baseband circuitry and radio front end modules (RFEM) in accordance with various exemplary embodiments.Figure 7 illustrates components of a core network in accordance with various exemplary embodiments.Figure 8 is a block diagram illustrating components of a system to support network function virtualization (NFV) according to various exemplary embodiments.Figure 9 is a block diagram illustrating components, according to some example embodiments, able to read instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium) and perform any one or more of the methodologies discussed herein.Figure 10 illustrates various protocol functions that may be implemented in a wireless communication device according to various exemplary embodiments.Figures 11A-D illustrate examples of a UE handover from a one cell to another cell according to various exemplary embodiments.Figure 12 shows one example of UE TX polarizations with its beam configurations within a same UE antenna panel, according to various exemplary embodiments.Figure 13 is a flowchart showing a method of effectuating a handover according to various exemplary embodiments. Detailed Description The following detailed description refers to the accompanying drawings. The same reference numbers may be used in different drawings to identify the same or similar elements. In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular structures, architectures, interfaces, techniques, etc. in order to provide a thorough understanding of the various aspects of various embodiments. However, it will be apparent to those skilled in the art having the benefit of the present disclosure that the various aspects of the various embodiments may be practiced in other examples that depart from these specific details. In certain instances, descriptions of well-known devices, circuits, processes and techniques are omitted so as not to obscure the description of the various embodiments with unnece