JP-7855104-B2 - Non-volatile computer-readable medium and beam search method

JP7855104B2JP 7855104 B2JP7855104 B2JP 7855104B2JP-7855104-B2

Inventors

李冠毅
謝竹旺

Assignees

緯創資通股▲ふん▼有限公司

Dates

Publication Date: 20260507
Application Date: 20250313
Priority Date: 20240403

Claims (5)

A beam search method for user equipment (UE), wherein the UE stores cell identifiers (IDs) and synchronization signal blocks (SSBs) from a previous network connection with a previously connected base station, and the method is: The process of reconnecting with the first base station after the event that caused the aforementioned loss of network connectivity , The process of reading the cell ID and the SSB in the previous network connection with the previously connected base station, The process involves transmitting the cell ID and the SSB information to the first base station via a physical random access channel (PRACH), and In response to the cell ID in the PRACH received by the first base station matching a preset cell ID set by the previously connected base station, the UE performs an initial access to the first base station via the cell ID and the SSB. A beam search method characterized by having the following features.
A beam search method for user equipment (UE), wherein the UE stores cell identifiers (IDs) and synchronization signal blocks (SSBs) from a previous network connection with a previously connected base station, and the method is: The process of reconnecting with the first base station after the event that caused the aforementioned loss of network connectivity , The process of reading the cell ID and the SSB in the previous network connection with the previously connected base station, The process involves transmitting the cell ID and the SSB information to the first base station via a physical random access channel (PRACH), In response to the cell ID in the PRACH received by the first base station matching a preset cell ID set by the previously connected base station, the UE performs an initial access to the first base station via the cell ID and the SSB. The steps include detecting a plurality of updated SSBs transmitted by the second base station in response to the cell ID in the PRAC not matching the preset cell ID set by the previously connected base station, The process involves sequentially measuring the received signal strength of the multiple updated SSB signals, The process of determining that the received signal strength of one of the multiple updated SSBs is higher than a threshold, The process involves transmitting information about one of the multiple updated SSBs to the second base station via the PRACH, and The process of performing the initial access to the second base station via one of the multiple updated SSBs, A beam search method characterized by having the following features.
A beam search method for user equipment (UE), wherein the UE stores cell identifiers (IDs) and synchronization signal blocks (SSBs) from a previous network connection with a previously connected base station, and the method is: The process of reconnecting with the first base station, The process of reading the cell ID and the SSB in the previous network connection with the previously connected base station, The process involves transmitting the cell ID and the SSB information to the first base station via a physical random access channel (PRACH), In response to the cell ID in the PRACH received by the first base station matching a preset cell ID set by the previously connected base station, the UE performs an initial access to the first base station via the cell ID and the SSB. The steps include detecting a plurality of wide-beam SSBs transmitted by a second base station in response to the cell ID in the PRAC not matching the preset cell ID set by the previously connected base station, A step of measuring the received signal intensity of each wide-beam SSB among the plurality of wide-beam SSBs, The process of selecting two wide-beam SSBs having the highest received signal strength from among the plurality of wide-beam SSBs, The process of transmitting information about the two wide-beam SSBs having the highest received signal strength among the plurality of wide-beam SSBs via the PRACH to the second base station, A step of detecting a plurality of narrow-beam SSBs transmitted by the second base station, wherein the beam directions of the plurality of narrow-beam SSBs are located between the beam directions of two of the plurality of wide-beam SSBs. A step of measuring the received signal intensity of each of the multiple narrow beam SSBs, A step of selecting one narrow beam SSB having the highest received signal intensity among the plurality of narrow beam SSBs, The steps include transmitting information about the one narrow-beam SSB having the highest received signal strength among the plurality of narrow-beam SSBs via the PRACH to the second base station, The process of performing the initial access to the second base station via one of the multiple narrow-beam SSBs, A beam search method characterized by having the following features.
A non-temporary computer-readable medium for storing one or more instructions to be executed by one or more processors of a base station and a network-connected user device (UE), wherein the one or more instructions are: The process of reconnecting the UE to the first base station after an event that caused the loss of the previous network connection with the previously connected base station , The process involves reading the cell identifier (ID) and synchronization signal block (SSB) from the previous network connection with the previously connected base station, The process involves transmitting the cell ID and the SSB information to the first base station via a physical random access channel (PRACH), The process includes the step of, in response to the cell ID in the PRACH received by the first base station matching a preset cell ID set by the previously connected base station, the UE performs an initial access to the first base station via the cell ID and the SSB, In response to the fact that the cell ID in the PRAC does not match the preset cell ID set by the previously connected base station, one or more commands: A process for detecting multiple updated SSBs transmitted by the second base station, The process involves sequentially measuring the received signal strength of the multiple updated SSB signals, The process of determining that the received signal strength of one of the multiple updated SSBs is higher than a threshold, The process of transmitting information about one of the multiple updated SSBs to the second base station via the PRACH, A non-temporary computer-readable medium characterized by having the step of performing the initial access to the second base station via one of the multiple updated SSBs.
A non-temporary computer-readable medium for storing one or more instructions to be executed by one or more processors of a base station and a network-connected user device (UE), wherein the one or more instructions are: The process of reconnecting the UE to the first base station, The process involves reading the cell ID and synchronization signal block (SSB) from a previous network connection with a previously connected base station, The process involves transmitting the cell ID and the SSB information to the first base station via a physical random access channel (PRACH), The process includes the step of, in response to the cell ID in the PRACH received by the first base station matching a preset cell ID set by the previously connected base station, the UE performs an initial access to the first base station via the cell ID and the SSB, In response to the fact that the cell ID in the PRAC does not match the preset cell ID set by the previously connected base station, one or more commands: A process for detecting multiple wide-beam SSBs transmitted by the second base station, A step of measuring the received signal intensity of each wide-beam SSB among the plurality of wide-beam SSBs, The process of selecting two wide-beam SSBs having the highest received signal strength from among the plurality of wide-beam SSBs, The process of transmitting information about the two wide-beam SSBs having the highest received signal strength among the plurality of wide-beam SSBs via the PRACH to the second base station, A step of detecting a plurality of narrow-beam SSBs transmitted by the second base station, wherein the beam directions of the plurality of narrow-beam SSBs are located between the beam directions of two of the plurality of wide-beam SSBs. A step of measuring the received signal intensity of each of the multiple narrow beam SSBs, A step of selecting one narrow beam SSB having the highest received signal intensity among the plurality of narrow beam SSBs, The steps include transmitting information about the one narrow-beam SSB having the highest received signal strength among the plurality of narrow-beam SSBs via the PRACH to the second base station, The process of performing the initial access to the second base station via one of the multiple narrow-beam SSBs, A non-temporary computer-readable medium characterized by having [a certain feature].

Description

This invention relates to a beam management method, and more particularly to a high-speed beam search method and a communication system therefor. The beam management process is used to acquire and maintain a set of beams that can be used for downlink (DL) and uplink (UL) transmission/reception at the transmit/receive point (TRxP) and/or user equipment (UE) in the 5G New Radio (NR) frequency range 2 (FR2). The 5G New Radio beam management process includes beam scanning, beam measurement, beam determination, and beam reporting. Beam scanning refers to covering a region of space with a set of beams transmitted and received at predetermined intervals and directions. After the UE completes the beam measurement, beam determination, and beam reporting processes, the base station (such as a gNB) can configure the UE's uplink and downlink beams via a synchronization signal block (SSB) based on the reported results from the UE. However, when the UE is in initial access, the base station performs a beam scan from the first SSB to the last SSB to select the optimal beam for synchronizing the UE, but this process wastes TRxP and the UE's time and power. This disclosure can be better understood by reading the following detailed description while referring to the accompanying figures. The figures illustrate exemplary embodiments of this disclosure and, together with the description, help to illustrate the principles of this disclosure. This is a flowchart of a beam search method according to several embodiments of the present invention.This is a flowchart of a beam search method according to several embodiments of the present invention.This is a flowchart of a beam search method according to several embodiments of the present invention.This figure shows a communication system 400 that performs the beam search method of Figure 2 according to some embodiments of the present invention.This figure shows a communication system 500 that performs the beam search method of Figure 3 according to some embodiments of the present invention.This figure shows a communication system 500 that performs the beam search method of Figure 3 according to some embodiments of the present invention. Figure 1 is a flowchart of a beam search method according to several embodiments of the present invention. The beam search method of the present invention is suitable for a UE. In some embodiments, the UE may be, for example, a laptop computer, a tablet, or a smartphone, but the present invention is not limited to these. In some embodiments of Figure 1, the UE stores the cell ID and synchronization signal block (SSB) from a previous network connection with a previously connected base station. In some embodiments, the previously connected base station may be, for example, a 5G base station such as a gNB, but the present invention is not limited to these. The beam search method has the following steps: First, reconnection with the first base station is performed (step S100). The cell ID and SSB from the previous network connection with the previously connected base station are read (step S102). The cell ID and SSB information are transmitted to the first base station via a physical random access channel (PRACH) (step S104). The first base station determines whether the cell ID in the PRACH matches a preset cell ID set by the previously connected base station (step S106). Initial access to the first base station is performed by the UE using the cell ID and SSB in response to the cell ID matching a preset cell ID (step S108). In steps S100 and S102, the cell ID and SSB from the previous network connection with the previously connected base station are stored in the non-volatile memory for the UE. Therefore, even after the UE completes its restart, it can read the cell ID and SSB used for the previous network connection with the previously connected base station. In some embodiments, if the UE does not perform a restart but simply turns its network function off and then on again, or moves from a location without network service to a location with network service, the cell ID and SSB from the UE's previous network connection with the previously connected base station can be stored in the UE's volatile memory; however, the present invention is not limited to these cases. In some embodiments, the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), and a demodulated reference signal (DMRS). The DMRS associated with the PBCH is used to estimate the reference signal received power (RSRP). The RSRP is calculated in the beam measurement phase based on the SSB received by the UE, and in the beam determination phase, the optimal beam is selected for the UE. In steps S104 and S106, in step S104, after the first base station receives the cell ID and SSB information in the PRACH transmitted by the UE, the first base station determines whether the cell ID in the PRACH matches a preset cell I