US-12621096-B2 - Method and device for selecting nodes using reference signals in wireless communication

US12621096B2US 12621096 B2US12621096 B2US 12621096B2US-12621096-B2

Abstract

The present application provides a method and a device in a node for wireless communications. A first node transmits a first signal; receives a first signaling in a first resource block; and monitors a first-type signaling in a first resource block subset after a first time using a spatial parameter of a target reference signal. The first signal indicates a first reference signal out of M reference signals; a transmitter of at least one reference signal among the M reference signals is a first cell, the first cell not being added by the first node; time-domain resource occupied by the first signaling is used to determine the first time. The method above makes quick cross-cell beam handover possible and enhances the performance of cell-boundary users as well as avoids the ping-pong effect with service quality fully-guaranteed.

Inventors

Keying Wu
Xiaobo Zhang

Assignees

APOGEE NETWORKS, LLC

Dates

Publication Date: 20260505
Application Date: 20230228
Priority Date: 20200911

Claims (20)

1 . A first node for wireless communications, comprising: a first transmitter, transmitting a first signal, the first signal indicating a first reference signal out of a plurality of reference signals; a first receiver, operatively coupled to the first transmitter, receiving a first signaling in a first resource block, a processor, operatively coupled to the first transmitter and the first receiver, determining a first time based on a time-domain resource occupied by the first signaling; the first receiver and the processor monitoring a first-type signaling in a first resource block subset after the first time using a spatial parameter of a target reference signal; the first receiver receiving at least one second reference signal among the plurality of reference signals from a first cell, wherein the first cell is a serving cell; the first receiver receiving the first reference signal from a target cell the first receiver and the processor adding the target cell on a condition that the target reference signal is the first reference signal; and the first transmitter transmitting an uplink transmission to the target cell.
2 . The first node according to claim 1 , wherein before the first time the first receiver and the processor monitor the first-type signaling in a second resource block subset using a spatial parameter of the at least one second reference signal; and wherein the first resource block subset and the second resource block subset are associated with a same control resource set.
3 . The first node according to claim 1 , wherein when the target cell is not added by the first node, the first receiver and the processor monitor a second-type signaling in a third resource block subset after a second time using a spatial parameter of the first reference signal; wherein the first reference signal is used to determine the third resource block subset; and wherein the second-type signaling is received from the target cell.
4 . The first node according to claim 3 , wherein the first receiver receives a first information block; and wherein the first information block is received from the target cell, the first information block being used to determine configuration information of the third resource block subset.
5 . The first node according to claim 1 , wherein the first receiver receives a second information block; wherein the first receiver and the processor monitor a third-type signaling in a fourth resource block set using a spatial parameter of the first reference signal; wherein the second information block includes configuration information of the fourth resource block set, and the second information block is received from a second cell, the second cell being added by the first node; and wherein the third-type signaling is received from the target cell.
6 . The first node according to claim 1 , wherein the first receiver receives a first reference signal set, and the first reference signal set includes at least one reference signal; and wherein a measurement of the first reference signal set is used to trigger transmission of the first signal.
7 . The first node according to claim 1 , wherein the first receiver receives a plurality of configuration information blocks; wherein the plurality of configuration information blocks respectively indicate the plurality of reference signals; at least one reference signal among the plurality of reference signals is received from a second cell, the second cell being added by the first node; wherein among the plurality of configuration information blocks each configuration information block corresponding to a reference signal transmitted by the first cell includes a first index, the first index being used to indicate the first cell; and wherein among the plurality of configuration information blocks each configuration information block corresponding to a reference signal transmitted by the second cell includes a second index, the second index being used to indicate the second cell.
8 . The first node according to claim 2 , wherein on a condition the target cell is added by the first node, the target reference signal is the first reference signal; and wherein on a condition the target cell is not added by the first node, the target reference signal is the at least one second reference signal.
9 . A second node for wireless communications, comprising: a second receiver, receiving a first signal from a first node, the first signal indicating a first reference signal out of a plurality of reference signals; a second transmitter, transmitting a first signaling in a first resource block to the first node, and transmitting a first-type signaling in a first resource block subset to the first node after a first time using a spatial parameter of a target reference signal; wherein at least one second reference signal among the plurality of reference signals is for a first cell, wherein the first cell is a serving cell; wherein the second node is a target cell; and receiving an uplink transmission from the first node.
10 . The second node according to claim 9 , wherein before the first time the second transmitter transmits the first-type signaling in a second resource block subset using a spatial parameter of the at least one second reference signal; and wherein the first resource block subset and the second resource block subset are associated with a same control resource set.
11 . The second node according to claim 9 , wherein the second transmitter transmits a second information block; wherein the second information block includes configuration information of a fourth resource block set; and wherein the second transmitter transmits a third-type signaling in the fourth resource block set using a spatial parameter of the first reference signal.
12 . The second node according to claim 9 , wherein the second transmitter transmits a first reference signal set, the first reference signal set includes at least one reference signal; and wherein a measurement of the first reference signal set is for triggering transmission of the first signal.
13 . The second node according to claim 9 , wherein the second transmitter transmits a plurality of configuration information blocks; wherein the plurality of configuration information blocks respectively indicate the plurality of reference signals; wherein the second transmitter transmits at least one reference signal among the plurality of reference signals and the second node is a second cell; wherein among the plurality of configuration information blocks each configuration information block corresponding to a reference signal transmitted by the first cell includes a first index, the first index being used to indicate the first cell; and wherein among the plurality of configuration information blocks each configuration information block corresponding to a reference signal transmitted by the second cell includes a second index, the second index being used to indicate the second cell.
14 . A method in a first node for wireless communications, comprising: transmitting a first signal, the first signal indicating a first reference signal out of a plurality of reference signals; receiving a first signaling in a first resource block; determining a first time based on a time-domain resource occupied by the first signaling; monitoring a first-type signaling in a first resource block subset after the first time using a spatial parameter of a target reference signal; receiving wherein a transmitter of at least one second reference signal among the plurality of reference signals from a first cell, wherein the first cell is a serving cell receiving the first reference signal from a target cell adding the target cell on a condition that the target reference signal is the first reference signal; and transmitting an uplink transmission to the target cell.
15 . The method according to claim 14 , further comprising: monitoring the first-type signaling in a second resource block subset using a spatial parameter of the at least one second reference signal before the first time; wherein the first resource block subset and the second resource block subset are associated with a same control resource set.
16 . The method according to claim 14 , further comprising: when the target cell is not added by the first node, monitoring a second-type signaling in a third resource block subset after a second time using a spatial parameter of the first reference signal; wherein the first reference signal is used to determine the third resource block subset; and wherein the second-type signaling is received from the target cell.
17 . The method according to claim 16 , further comprising: receiving a first information block; wherein of the first information block is received from the target cell, the first information block being used to determine configuration information of the third resource block subset.
18 . The method according to claim 14 , further comprising: receiving a second information block; and monitoring a third-type signaling in a fourth resource block set using a spatial parameter of the first reference signal; wherein the second information block includes configuration information of the fourth resource block set, and the second information block is received from a second cell, the second cell being added by the first node; and wherein the third-type signaling is received from the target cell.
19 . The method according to claim 14 , further comprising: receiving a first reference signal set, the first reference signal set including at least one reference signal; wherein a measurement of the first reference signal set is used to trigger transmission of the first signal.
20 . The method according to claim 14 , further comprising: receiving a plurality of configuration information blocks; wherein the plurality of configuration information blocks respectively indicate the plurality of reference signals; at least one reference signal among the plurality of reference signals is received from a second cell, the second cell being added by the first node; wherein among the plurality of configuration information blocks each configuration information block corresponding to a reference signal transmitted by the first cell includes a first index, the first index being used to indicate the first cell; and wherein among the plurality of configuration information blocks each configuration information block corresponding to a reference signal transmitted by the second cell includes a second index, the second index being used to indicate the second cell.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is the continuation of the international patent application No. PCT/CN2021/117355, filed on Sep. 9, 2021, which claims the priority benefit of Chinese Patent Application No. 202010951034.4, filed on September 11, and claims the priority benefit of Chinese Patent Application No. 202011071252.5, filed on Oct. 9, 2020, and claims the priority benefit of Chinese Patent Application No. 202010975478.1, filed on Sep. 16, 2020, and claims the priority benefit of Chinese Patent Application No. 202110555395.1, filed on May 21, 2021, the full disclosure of which is incorporated herein by reference. BACKGROUND Technical Field The present application relates to transmission methods and devices in wireless communication systems, and in particular to a method and device for radio signal transmission in a wireless communication system supporting cellular networks. Related Art In LTE systems, inter-cell handover is controlled by a base station based on measurements of a User Equipment (UE). And the inter-cell handover in the 3rd Generation Partner Project (3GPP) Release (R) 15 basically adopts the mechanism used in the LTE. As for a New Radio (NR) system, more application scenarios need to be supported. Some scenarios, such as Ultra-Reliable and Low Latency Communications (URLLC), has posed high demands on the delay, and new challenges are also presented against inter-cell handover. In the NR system, Massive Multiple Input Multiple Output (MIMO) is a significant technical feature. In Massive MIMO, multiple antennas form through beamforming a narrow beam pointing in a specific direction to enhance communication quality. Since the beam formed by multiple antennas through beamforming is generally narrow, beams from both sides of communications are required to be aligned for performing effective communications. SUMMARY Inventors find through researches that beam-based communications will have negative influence on inter-cell handover, such as extra delay and pingpong effect. Then how to reduce the negative impact and go deeper in improving the performance of users at the cell boundary to meet various demands of application scenarios is an issue remaining to be solved. To address the above problem, the present application provides a solution. It should be noted that though the present application only took the massive MIMO and beam-based communications as a typical or exemplary scenario in the statement above, it is also applicable to other scenarios such as LTE multi-antenna system, where similar technical effects can be achieved. Additionally, the adoption of a unified solution for various scenarios, including but not limited to massive MIMO, beam-based communications, and LTE multi-antenna system, contributes to the reduction of hardcore complexity and costs. In the case of no conflict, the embodiments of any node and the characteristics in the embodiments may be applied to any other node, and vice versa. What's more, the embodiments in the present application and the characteristics in the embodiments can be arbitrarily combined if there is no conflict. In one embodiment, interpretations of the terminology in the present application refer to definitions given in the 3GPP TS36 series. In one embodiment, interpretations of the terminology in the present application refer to definitions given in the 3GPP TS38 series. In one embodiment, interpretations of the terminology in the present application refer to definitions given in the 3GPP TS37 series. In one embodiment, interpretations of the terminology in the present application refer to definitions given in Institute of Electrical and Electronics Engineers (IEEE) protocol specifications. The present application provides a method in a first node for wireless communications, comprising: transmitting a first signal, the first signal indicating a first reference signal out of M reference signals, M being a positive integer greater than 1; andreceiving a first signaling in a first resource block; andmonitoring a first-type signaling in a first resource block subset after a first time using a spatial parameter of a target reference signal;herein, a transmitter of at least one reference signal among the M reference signals is a first cell, the first cell not being added by the first node; a time-domain resource occupied by the first signaling is used to determine the first time; a transmitter of the first reference signal is a target cell, and whether the target cell is added by the first node is used to determine whether the target reference signal is the first reference signal. In one embodiment, a problem to be solved in the present application includes: how to reduce the delay brought about by inter-cell handover and avoid service interruption. The above method provided can solve this problem by making the UE measure reference signals from the cell and its neighbor cell, and determine according to feedback of the UE whether i