EP-4736536-A1 - MOBILITY INFORMATION LOGGING IN WIRELESS COMMUNICATIONS

EP4736536A1EP 4736536 A1EP4736536 A1EP 4736536A1EP-4736536-A1

Abstract

The present disclosure is related to mobility information logging in wireless communications. According to an embodiment of the present disclosure, a communication device may, after a mobility procedure ends, transmit mobility information comprising: first information for an execution condition that is satisfied first among a first execution condition for a primary cell (PCell) mobility to a target PCell and a second execution condition for a primary secondary cell (PSCell) mobility to a target PSCell associated with the target PCell; and second information for a time duration that has elapsed since the execution condition was satisfied.

Inventors

KIM, HONGSUK

Assignees

LG Electronics Inc.

Dates

Publication Date: 20260506
Application Date: 20240628

Claims (20)

A method performed by a communication device adapted to operate in a wireless communication system, the method comprising: receiving a conditional reconfiguration comprising execution conditions for mobility including i) a first execution condition for a PCell mobility to a target PCell, and ii) a second execution condition for a PSCell mobility to a target PSCell associated with the target PCell; evaluating the execution conditions including the first execution condition for the target PCell and the second execution condition for the associated target PSCell; performing a mobility procedure based on one or more execution conditions among the execution conditions being satisfied; and after the mobility procedure ends, transmitting mobility information comprising: first information for an execution condition that is satisfied first among the first execution condition and the second execution condition; and second information for a time duration that has elapsed since the execution condition was satisfied.
The method of claim 1, wherein, based on the target PSCell being associated with the target PCell: a mobility towards the target PCell and a mobility towards the target PSCell are performed together when both of the first execution condition for the target PCell and the second execution condition for the target PSCell are satisfied; and neither the mobility towards the target PCell nor the mobility towards the target PSCell is performed when at least one of the first execution condition for the target PCell or the second execution condition for the target PSCell is satisfied.
The method of claim 1, wherein the mobility procedure ends in failure, and wherein the mobility information comprises mobility failure information comprising the first information and the second information.
The method of claim 3, further comprising: initiating a radio resource control (RRC) re-establishment procedure based on a failure of the mobility procedure; and logging the mobility failure information based on initiating the RRC re-establishment procedure.
The method of claim 4, wherein the logged mobility failure information further comprises at least one of: a cell identity of the target PCell; a measurement result of the target PCell; a cell identity of the target PSCell; a measurement result of the target PCell; information for a time at which the execution condition was satisfied; information for an evaluation status of at least one of the first execution condition or the second execution condition when the mobility procedure failed; or information for a time gap between a time of the execution condition being satisfied and a time when the mobility procedure failed.
The method of claim 4, further comprising: selecting a cell based on initiating the RRC re-establishment procedure; transmitting, to a network through the selected cell, an RRC re-establishment request message; receiving, from the network, an RRC re-establishment message; and transmitting, to the network, an RRC re-establishment complete message comprising first availability information informing that the mobility failure information is available in the communication device.
The method of claim 6, further comprising: after transmitting the first availability information, receiving, from the network, user equipment (UE) information request message comprising a request for the mobility failure information; and transmitting, to the network, UE information response message comprising the mobility failure information.
The method of claim 1, wherein the mobility procedure ends in success, and wherein the mobility information comprises mobility success information comprising the first information and the second information.
The method of claim 8, further comprising: logging the mobility success information based on a success of the mobility procedure.
The method of claim 9, further comprising: starting a timer with a timer value based on initiating the mobility procedure; performing the mobility procedure while the timer is running; and stopping the timer based on the success of the mobility procedure, wherein the mobility success information is logged based on a ratio between a value of an elapsed time of the timer until the timer stops from the start of the timer to the timer value being greater than a threshold received from a network before initiating the mobility procedure.
The method of claim 9, wherein the logged mobility success information further comprises at least one of: a cell identity of at least one of a source PCell or the target PCell; a measurement result of at least one of the source PCell or the target PCell; a cell identity of at least one of a source PSCell or the target PSCell; a measurement result of at least one of the source PSCell or the target PCell; information for a time at which the execution condition was satisfied; or information for an evaluation status of at least one of the first execution condition or the second execution condition when the mobility procedure succeeded.
The method of claim 8, further comprising: transmitting, to a network, a radio resource control (RRC) reconfiguration complete message based on a success of the mobility procedure, wherein the RRC reconfiguration complete message comprises second availability information informing that the mobility success information is available in the communication device.
The method of claim 12, further comprising: after transmitting the second availability information, receiving, from the network, user equipment (UE) information request message comprising a request for the mobility success information; and transmitting, to the network, UE information response message comprising the mobility success information.
The method of claims 1, wherein the communication device is in communication with at least one of a user equipment (UE), a mobile device, a network, or autonomous vehicles.
A communication device configured to operate in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: receiving a conditional reconfiguration comprising execution conditions for mobility including i) a first execution condition for a PCell mobility to a target PCell, and ii) a second execution condition for a PSCell mobility to a target PSCell associated with the target PCell; evaluating the execution conditions including the first execution condition for the target PCell and the second execution condition for the associated target PSCell; performing a mobility procedure based on one or more execution conditions among the execution conditions being satisfied; and after the mobility procedure ends, transmitting mobility information comprising: first information for an execution condition that is satisfied first among the first execution condition and the second execution condition; and second information for a time duration that has elapsed since the execution condition was satisfied.
The communication device of claim 15, wherein the communication device is adapted to implement a method of one of claims 2 to 14.
A network node configured to operate in a wireless communication system, the network node comprising: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: transmitting, to a communication device, a measurement configuration; receiving, from the communication device, a measurement report; and transmitting, to the communication device, a conditional reconfiguration comprising execution conditions for mobility including i) a first execution condition for a PCell mobility to a target PCell, and ii) a second execution condition for a PSCell mobility to a target PSCell associated with the target PCell, wherein the communication device is adapted to perform operations comprising: evaluating the execution conditions including the first execution condition for the target PCell and the second execution condition for the associated target PSCell; performing a mobility procedure based on one or more execution conditions among the execution conditions being satisfied; and after the mobility procedure ends, transmitting mobility information comprising: first information for an execution condition that is satisfied first among the first execution condition and the second execution condition; and second information for a time duration that has elapsed since the execution condition was satisfied.
A method performed by a network node configured to operate in a wireless communication system, the method comprising: transmitting, to a communication device, a measurement configuration; receiving, from the communication device, a measurement report; and transmitting, to the communication device, a conditional reconfiguration comprising execution conditions for mobility including i) a first execution condition for a PCell mobility to a target PCell, and ii) a second execution condition for a PSCell mobility to a target PSCell associated with the target PCell, wherein the communication device is adapted to perform operations comprising: evaluating the execution conditions including the first execution condition for the target PCell and the second execution condition for the associated target PSCell; performing a mobility procedure based on one or more execution conditions among the execution conditions being satisfied; and after the mobility procedure ends, transmitting mobility information comprising: first information for an execution condition that is satisfied first among the first execution condition and the second execution condition; and second information for a time duration that has elapsed since the execution condition was satisfied.
An apparatus adapted to operate in a wireless communication system, the apparatus comprising: at least processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: receiving a conditional reconfiguration comprising execution conditions for mobility including i) a first execution condition for a PCell mobility to a target PCell, and ii) a second execution condition for a PSCell mobility to a target PSCell associated with the target PCell; evaluating the execution conditions including the first execution condition for the target PCell and the second execution condition for the associated target PSCell; performing a mobility procedure based on one or more execution conditions among the execution conditions being satisfied; and after the mobility procedure ends, transmitting mobility information comprising: first information for an execution condition that is satisfied first among the first execution condition and the second execution condition; and second information for a time duration that has elapsed since the execution condition was satisfied.
A non-transitory computer readable medium (CRM) having stored thereon a program code implementing instructions that, based on being executed by at least one processor, perform operations comprising: receiving a conditional reconfiguration comprising execution conditions for mobility including i) a first execution condition for a PCell mobility to a target PCell, and ii) a second execution condition for a PSCell mobility to a target PSCell associated with the target PCell; evaluating the execution conditions including the first execution condition for the target PCell and the second execution condition for the associated target PSCell; performing a mobility procedure based on one or more execution conditions among the execution conditions being satisfied; and after the mobility procedure ends, transmitting mobility information comprising: first information for an execution condition that is satisfied first among the first execution condition and the second execution condition; and second information for a time duration that has elapsed since the execution condition was satisfied.

Description

MOBILITY INFORMATION LOGGING IN WIRELESS COMMUNICATIONS The present disclosure is related to mobility information logging in wireless communications. 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement. Work has started in International Telecommunication Union (ITU) and 3GPP to develop requirements and specifications for New Radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU Radio communication sector (ITU-R) International Mobile Telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future. The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), Ultra-Reliable and Low Latency Communications (URLLC), etc. The NR shall be inherently forward compatible. In wireless communications, a communication device may log mobility information after a mobility procedure ends in failure or success. The communication device may report the logged mobility information to a network, and the network may use the reported mobility information for various purposes, including a mobility configuration for another mobility. FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied. FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied. FIG. 3 shows an example of UE to which implementations of the present disclosure is applied. FIGs. 4 and 5 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied. FIG. 6 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied. FIG. 7 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied. FIG. 8 shows an example of a dual connectivity (DC) architecture to which technical features of the present disclosure can be applied. FIG. 9 shows an example of a conditional mobility procedure according to an embodiment of the present disclosure. FIG. 10 shows an example of a method performed by a communication device according to an embodiment of the present disclosure. FIG. 11 shows an example of a signal flow between a communication device and a network node according to an embodiment of the present disclosure. FIG. 12 shows an example of a procedure for logging of mobility information after the mobility failure according to an embodiment of the present disclosure. FIG. 13 shows an example of a procedure for logging of mobility information after the mobility failure according to an embodiment of the present disclosure. The following techniques, apparatuses, and systems may be applied to a variety of wireless multiple access systems. Examples of the multiple access systems include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and a Multi Carrier Frequency Division Multiple Access (MC-FDMA) system. CDMA may be embodied through radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be embodied through radio technology such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data rates for GSM Evolution (EDGE). OFDMA may be embodied through radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is a part of a Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE employs OFDMA in downlink (DL) and SC-FDMA in uplink (UL). Evolution of 3GPP LTE includes LTE-Advanced (LTE-A), LTE-A Pro, and/or 5G New Radio (NR). For convenience of description, implementations of the present disclosure are mainly described in re