Methods and apparatus in a wireless communication system

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An embodiment of the present disclosure provides a method performed by a first node in a communication system, comprising: transmitting a first request message to a third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of a requested random access occasion (RO); receiving a first response message from the third node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources; receiving a third notification message from the third node, wherein the third notification message includes first information related to a timing advance (TA); transmitting a fourth notification message to a second node, wherein the fourth notification message includes second information related to a timing advance (TA).

Description

METHODS AND APPARATUS IN A WIRELESS COMMUNICATION SYSTEM

[0001] The application relates to the field of communications, and more particularly, to a first node, a second node, a third node, a user equipment, and methods performed by them.

[0002] 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.

[0003] At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.

[0004] Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.

[0005] Moreover, there has been ongoing standardization in air interface architecture / protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture / service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.

[0006] As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.

[0008] Embodiments of the present disclosure is to provide an apparatus and method for effectively providing a service in a wireless communication system.

[0009] In an embodiment, a method performed by a first node in a wireless communication system is provided. The method includes: transmitting a first request message to a third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of a requested random access occasion (RO); receiving a first response message from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources; receiving a third notification message from the third node, wherein the third notification message includes first information related to a timing advance (TA); and transmitting a fourth notification message to a second node, wherein the fourth notification message includes second information related to a timing advance (TA). Wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA, wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0010] In an embodiment, a method performed by a second node in a wireless communication system is provided. The method includes: receiving a fourth notification message from a first node, wherein the fourth notification message includes second information related to a timing advance (TA); and transmitting a first command message to a User Equipment (UE), wherein the first command message includes twentieth information related to the TA. Wherein the fourth notification message is based on a third notification message received by the first node from a third node, wherein the third notification message includes first information related to a Timing advance (TA), wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources, wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of requested random access occasion (RO), wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA, wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0011] In an embodiment, a first node in a wireless communication system is provided. The first node includes at least one transceiver; at least one processor communicatively coupled to the at least one transceiver; and at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the first node to transmit a first request message to a third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of a requested random access occasion (RO), receive a first response message from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources, receive a third notification message from the third node, wherein the third notification message includes first information related to a timing advance (TA), transmit a fourth notification message to a second node, wherein the fourth notification message includes second information related to a timing advance (TA). Wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA, wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0012] In an embodiment, a second node in a wireless communication system is provided. The second node includes at least one transceiver; at least one processor communicatively coupled to the at least one transceiver; and at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the second node to receive a fourth notification message from a first node, wherein the fourth notification message includes second information related to a timing advance (TA), transmit a first command message to a User Equipment (UE), wherein the first command message includes twentieth information related to the TA. Wherein the fourth notification message is based on a third notification message received by the first node from a third node, wherein the third notification message includes first information related to a Timing advance (TA), wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources, wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of requested random access occasion (RO), wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA, wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0013] According to an aspect of the present disclosure, a method performed by a first node in a communication system is provided, comprising: transmitting a first request message to a third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of a requested random access occasion (RO); receiving a first response message from the third node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources; receiving a third notification message from the third node, wherein the third notification message includes first information related to a timing advance (TA); transmitting a fourth notification message to a second node, wherein the fourth notification message includes second information related to a timing advance (TA); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0014] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the first response message further includes at least one of: sixth information relating to a type of allocated resources for early uplink synchronization; seventh information related to a type of an allocated random access occasion (RO); third configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0015] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the first information or second information includes at least one of: eighth information related to a type of resources for early uplink synchronization corresponding to a current TA value; ninth information related to a type of random access occasion (RO) for early uplink synchronization corresponding to the current TA value; a preamble index for a random access related to the SBFD; first user information, which includes information related to UE that performs a random access through the SBFD.

[0016] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the method further comprises: transmitting a second request message to the second node, wherein the second request message includes tenth information related to configuration of early synchronization of a candidate cell; receiving a second response message from the second node, wherein the second response message includes response information to the tenth information.

[0017] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the method further comprises: receiving a third request message from a fifth node, wherein the third request message includes eleventh information related to a type of requested resources for early uplink synchronization and / or twelfth information related to a type of a requested random access occasion (RO); transmitting a third response message to the fifth node, wherein the third response message includes thirteenth information related to a configuration of early synchronization of a candidate cell.

[0018] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the tenth or thirteenth information includes at least one of: fourth configuration information associated with an allocated early synchronization related to the SBFD; fourteenth information relating to a type of allocated resources for early uplink synchronization; fifteenth information related to a type of an allocated random access occasion (RO); fifth configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0019] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein at least one of the following is indicated by ENUMERATED types: the fourth information, the fifth information, the sixth information, the seventh information, the eighth information, the ninth information, the eleventh information, the twelfth information, the fourteenth information, the fifteenth information.

[0020] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the ENUMERATED types include at least one of: ENUMERATED (a first type, a second type, both the first type and the second type); ENUMERATED (the second type, only the second type); ENUMERATED (the first type, the second type); ENUMERATED (the first type, the second type, a third type); ENUMERATED (true); wherein the first type includes the first type of resources or the first type of RO, the second type includes the second type of resources or the second type of RO, and the third type includes a third type of RO.

[0021] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the first type of RO includes an RO related an uplink slot of the TDD; the second type of RO includes an RO related to an SBFD uplink sub-band; the third type of RO includes an RO corresponding to resources for both uplink and downlink.

[0022] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the second configuration information, the third configuration information, the fourth configuration information, or the fifth configuration information includes at least one of: a subcarrier spacing of the SBFD; a starting frequency or starting frequency band of the SBFD; a number of random access occasions of a random access channel (RACH) of the SBFD; an index of a random access configuration of the RACH of the SBFD; a number of synchronization signal blocks (SSBs) of each random access occasion of SBFD; a frequency domain length of a random access occasion of the SBFD; zero correlation zone configuration for a random access of the SBFD; a random access response window of the SBFD.

[0023] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein at least one of the fourth information, the fifth information, the eleventh information, or the twelfth information is indicated by first capability information including information related to whether a User Equipment (UE) supports the SBFD.

[0024] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the method further comprises: transmitting a downlink radio resource control (RRC) message delivery message to the second node, wherein the RRC message transfer message includes at least one of: sixth configuration information related to Sub-band Full Duplex (SBFD) Contention Free Random Access (CFRA), sixteenth information associated with early uplink synchronization related to the SBFD; wherein an RRC reconfiguration message is transmitted by the second node to the user equipment (UE), wherein the RRC reconfiguration message includes at least one of the sixth configuration information or the sixteenth information; wherein a RRC reconfiguration complete message is received by the second node from the UE.

[0025] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein seventeenth information for timing advance (TA) acquisition is transmitted by the second node to the UE.

[0026] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the sixteenth information, or the seventeenth information, comprises at least one of: seventh configuration information associated with allocated resources for early uplink synchronization related to the SBFD; eighteenth information related to a type of allocated resources for early uplink synchronization; nineteenth information related to a type of an allocated random access occasion (RO).

[0027] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein the RRC reconfiguration message further includes at least one of: seventh configuration information, which includes information associated with resources for early uplink synchronization of time division duplex (TDD);eighth configuration information, which includes information associated with UE-specific TDD random access resources.

[0028] In combination with any of the above embodiments, according to the method performed by the first node in the communication system provided by the present disclosure, wherein a fourth request message is received by the third node, and the fourth request information includes twenty-first information related to requested resources for early uplink synchronization, and wherein if the fourth information is indicated by an ENUMERATED type, the twenty-first information is ignored.

[0029] According to another aspect of the present disclosure, there is provided a method performed by a second node in a communication system, comprising: receiving a fourth notification message from a first node, wherein the fourth notification message includes second information related to a timing advance (TA); transmitting a first command message to a User Equipment (UE), wherein the first command message includes twentieth information related to the TA; wherein the fourth notification message is based on a third notification message received by the first node from a third node, wherein the third notification message includes first information related to a Timing advance (TA); wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources; wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of requested random access occasion (RO); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0030] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the method further comprises: receiving a downlink radio resource control (RRC) message delivery message from the first node, wherein the RRC message transfer message includes at least one of: sixth configuration information related to Sub-band Full Duplex (SBFD) Contention Free Random Access (CFRA), sixteenth information associated with early uplink synchronization related to the SBFD; transmitting an RRC reconfiguration message to the user equipment (UE), wherein the RRC reconfiguration message includes at least one of the sixth configuration information or the sixteenth information; receiving an RRC reconfiguration complete message from the UE.

[0031] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure wherein the method further comprises: transmitting seventeenth information for timing advance (TA) acquisition to the UE.

[0032] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the sixteenth information, or the seventeenth information includes at least one of: seventh configuration information associated with allocated resources for early uplink synchronization related to the SBFD; eighteenth information related to a type of allocated resources for early uplink synchronization; nineteenth information related to a type of an allocated random access occasion (RO).

[0033] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the sixth configuration information or the seventh configuration information includes at least one of the following: a subcarrier spacing of the SBFD; a starting frequency or starting frequency band of the SBFD; a number of random access occasions of a random access channel (RACH) of the SBFD; an index of a random access configuration of the RACH of the SBFD; a number of synchronization signal blocks (SSBs) of each random access occasion of SBFD; a frequency domain length of a random access occasion of the SBFD; zero correlation zone configuration for a random access of the SBFD; a random access response window of the SBFD.

[0034] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the RRC reconfiguration message further includes at least one of: seventh configuration information, which includes information associated with resources for early uplink synchronization of time division duplex (TDD); eighth configuration information, which includes information associated with UE-specific TDD random access resources.

[0035] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the first response message further includes at least one of the following: a sixth information related to the type of allocated resources for early uplink synchronization; Seventh information related to a type of an allocated random access occasion (RO); Third configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0036] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the first response message further includes at least one of: sixth information relating to a type of allocated resources for early uplink synchronization; seventh information related to a type of an allocated random access occasion (RO); third configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0037] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the method further includes: receiving a second request message from the first node, wherein the second request message includes tenth information related to configuration of early synchronization of a candidate cell; transmitting a second response message to the first node, wherein the second response message includes response information to the tenth information.

[0038] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein a third request message received by the first node from a fifth node, wherein the third request message includes eleventh information related to a type of requested resources for early uplink synchronization and / or twelfth information related to a type of a requested random access occasion (RO); wherein a third response message transmitted by the first node to the fifth node, wherein the third response message includes thirteenth information related to a configuration of early synchronization of a candidate cell.

[0039] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the tenth or thirteenth information includes at least one of: fourth configuration information associated with an allocated early synchronization related to the SBFD; fourteenth information relating to a type of allocated resources for early uplink synchronization; fifteenth information related to a type of an allocated random access occasion (RO); fifth configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0040] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein at least one of the following is indicated by ENUMERATED types: the fourth information, the fifth information, the sixth information, the seventh information, the eighth information, the ninth information, the eleventh information, the twelfth information, the fourteenth information, the fifteenth information.

[0041] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the ENUMERATED types include at least one of: ENUMERATED (a first type, a second type, both the first type and the second type); ENUMERATED (the second type, only the second type); ENUMERATED (the first type, the second type); ENUMERATED (the first type, the second type, a third type); ENUMERATED (true); wherein the first type includes the first type of resources or the first type of RO, the second type includes the second type of resources or the second type of RO, and the third type includes a third type of RO.

[0042] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the first type of RO includes an RO related an uplink slot of the TDD; the second type of RO includes an RO related to an SBFD uplink sub-band; the third type of RO includes an RO corresponding to resources for both uplink and downlink.

[0043] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein the second configuration information, the third configuration information, the fourth configuration information, or the fifth configuration information includes at least one of: a subcarrier spacing of the SBFD; a starting frequency or starting frequency band of the SBFD; a number of random access occasions of a random access channel (RACH) of the SBFD; an index of a random access configuration of the RACH of the SBFD; a number of synchronization signal blocks (SSBs) of each random access occasion of SBFD; a frequency domain length of a random access occasion of the SBFD; zero correlation zone configuration for a random access of the SBFD; a random access response window of the SBFD.

[0044] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein at least one of the fourth information, the fifth information, the eleventh information, or the twelfth information is indicated by first capability information including information related to whether a User Equipment (UE) supports the SBFD.

[0045] In combination with any of the above embodiments, according to the method performed by the second node in the communication system provided by the present disclosure, wherein a fourth request message is received by the third node, and the fourth request information includes twenty-first information related to requested resources for early uplink synchronization, and wherein if the fourth information is indicated by an ENUMERATED type, the twenty-first information is ignored.

[0046] According to another aspect of the present disclosure, there is provided a method performed by a User Equipment (UE) in a communication system, comprising: receiving seventeenth information for timing advance (TA) acquisition from a second node, transmitting a preamble to a third node, receiving a first command message from the second node, wherein the first command message includes twentieth information related to the TA, wherein the first command message is based on a fourth notification message transmitted by the first node to the second node, wherein the fourth notification message includes second information related to a Timing advance (TA); wherein the fourth notification message is based on a third notification message received by the first node from the third node, wherein the third notification message includes first information related to a Timing advance (TA); wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources, wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of a requested random access occasion (RO); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0047] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the seventeenth information includes at least one of the following: seventh configuration information associated with allocated resources for early uplink synchronization related to the SBFD; eighteenth information related to a type of allocated resources for early uplink synchronization; nineteenth information related to a type of an allocated random access occasion (RO).

[0048] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the first response message further includes at least one of: sixth information relating to a type of allocated resources for early uplink synchronization; seventh information related to a type of an allocated random access occasion (RO); third configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0049] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the first information or second information includes at least one of: eighth information related to a type of resources for early uplink synchronization corresponding to a current TA value; ninth information related to a type of random access occasion (RO) for early uplink synchronization corresponding to the current TA value; a preamble index for a random access related to the SBFD; first user information, which includes information related to UE that performs a random access through the SBFD.

[0050] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein a second request message is transmitted by the first node to the second node , wherein the second request message includes tenth information related to configuration of early synchronization of a candidate cell; wherein a second response message is received by the first node from the second node, wherein the second response message includes response information to the tenth information.

[0051] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein a third request message received by the first node from a fifth node, wherein the third request message includes eleventh information related to a type of requested resources for early uplink synchronization and / or twelfth information related to a type of a requested random access occasion (RO); wherein a third response message transmitted by the first node to the fifth node, wherein the third response message includes thirteenth information related to a configuration of early synchronization of a candidate cell.

[0052] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the tenth or thirteenth information includes at least one of: fourth configuration information associated with an allocated early synchronization related to the SBFD; fourteenth information relating to a type of allocated resources for early uplink synchronization; fifteenth information related to a type of an allocated random access occasion (RO); fifth configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0053] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein at least one of the following is indicated by ENUMERATED types: the fourth information, the fifth information, the sixth information, the seventh information, the eighth information, the ninth information, the eleventh information, the twelfth information, the fourteenth information, the fifteenth information.

[0054] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the ENUMERATED types include at least one of: ENUMERATED (a first type, a second type, both the first type and the second type); ENUMERATED (the second type, only the second type); ENUMERATED (the first type, the second type); ENUMERATED (the first type, the second type, a third type); ENUMERATED (true); wherein the first type includes the first type of resources or the first type of RO, the second type includes the second type of resources or the second type of RO, and the third type includes a third type of RO.

[0055] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the first type of RO includes an RO related an uplink slot of the TDD; the second type of RO includes an RO related to an SBFD uplink sub-band; the third type of RO includes an RO corresponding to resources for both uplink and downlink.

[0056] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the second configuration information, the third configuration information, the fourth configuration information, or the fifth configuration information includes at least one of: a subcarrier spacing of the SBFD; a starting frequency or starting frequency band of the SBFD; a number of random access occasions of a random access channel (RACH) of the SBFD; an index of a random access configuration of the RACH of the SBFD; a number of synchronization signal blocks (SSBs) of each random access occasion of SBFD; a frequency domain length of a random access occasion of the SBFD; zero correlation zone configuration for a random access of the SBFD; a random access response window of the SBFD.

[0057] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein at least one of the fourth information, the fifth information, the eleventh information, or the twelfth information is indicated by first capability information including information related to whether a User Equipment (UE) supports the SBFD.

[0058] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein a downlink Radio resource control (RRC) message delivery message is transmitted by the first node to the second node wherein the RRC message transfer message includes at least one of: sixth configuration information related to Sub-band Full Duplex (SBFD) Contention Free Random Access (CFRA), sixteenth information associated with early uplink synchronization related to the SBFD; wherein an RRC reconfiguration message is transmitted by a second node to a user equipment (UE), wherein the RRC reconfiguration message includes at least one of the sixth configuration information or the sixteenth information; wherein an RRC reconfiguration complete message is received by the second node from the UE.

[0059] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein seventeenth information for timing advance (TA) acquisition is transmitted by the second node to the UE.

[0060] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the sixteenth information, or the seventeenth information includes at least one of: seventh configuration information associated with allocated resources for early uplink synchronization related to the SBFD; eighteenth information related to a type of allocated resources for early uplink synchronization; nineteenth information related to a type of an allocated random access occasion (RO).

[0061] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein the RRC reconfiguration message further includes at least one of: seventh configuration information, which includes information associated with resources for early uplink synchronization of time division duplex (TDD); eighth configuration information, which includes information associated with UE-specific TDD random access resources.

[0062] In combination with any of the above embodiments, according to the method performed by the User Equipment (UE) in the communication system provided by the present disclosure, wherein a fourth request message is received by the third node, and the fourth request information includes twenty-first information related to requested resources for early uplink synchronization, and wherein if the fourth information is indicated by an ENUMERATED type, the twenty-first information is ignored.

[0063] According to another aspect of the present disclosure, there is provided a method performed by a third node in a communication system, comprising: receiving a first request message from a first node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of a requested random access occasion (RO); transmitting a first response message to the first node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources; transmitting a third notification message to the first node, wherein the third notification message includes first information related to a timing advance (TA); wherein a fourth notification message based on the third notification message is transmitted through the first node to a second node, wherein the fourth notification message includes second information related to a timing advance (TA); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0064] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the method further comprises: receiving a fourth request message, wherein the fourth request information includes twenty-first information related to requested resources for early uplink synchronization, wherein if the fourth information is indicated by an ENUMERATED type, the twenty-first information is ignored.

[0065] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the first response message further includes at least one of: sixth information relating to a type of allocated resources for early uplink synchronization; seventh information related to a type of an allocated random access occasion (RO); third configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0066] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the first information or second information includes at least one of: eighth information related to a type of resources for early uplink synchronization corresponding to a current TA value; ninth information related to a type of random access occasion (RO) for early uplink synchronization corresponding to the current TA value; a preamble index for a random access related to the SBFD; first user information, which includes information related to UE that performs a random access through the SBFD.

[0067] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein a second request message is transmitted by the first node to the second node , wherein the second request message includes tenth information related to configuration of early synchronization of a candidate cell; wherein a second response message is received by the first node from the second node, wherein the second response message includes response information to the tenth information.

[0068] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein a third request message received by the first node from a fifth node, wherein the third request message includes eleventh information related to a type of requested resources for early uplink synchronization and / or twelfth information related to a type of a requested random access occasion (RO); wherein a third response message transmitted by the first node to the fifth node, wherein the third response message includes thirteenth information related to a configuration of early synchronization of a candidate cell.

[0069] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the tenth or thirteenth information includes at least one of: fourth configuration information associated with an allocated early synchronization related to the SBFD; fourteenth information relating to a type of allocated resources for early uplink synchronization; fifteenth information related to a type of an allocated random access occasion (RO); fifth configuration information related to an allocated SBFD Contention Free Random Access (CFRA).

[0070] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein at least one of the following is indicated by ENUMERATED types: the fourth information, the fifth information, the sixth information, the seventh information, the eighth information, the ninth information, the eleventh information, the twelfth information, the fourteenth information, the fifteenth information.

[0071] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the ENUMERATED types include at least one of: ENUMERATED (a first type, a second type, both the first type and the second type); ENUMERATED (the second type, only the second type); ENUMERATED (the first type, the second type); ENUMERATED (the first type, the second type, a third type); ENUMERATED (true); wherein the first type includes the first type of resources or the first type of RO, the second type includes the second type of resources or the second type of RO, and the third type includes a third type of RO.

[0072] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the first type of RO includes an RO related an uplink slot of the TDD; the second type of RO includes an RO related to an SBFD uplink sub-band; the third type of RO includes an RO corresponding to resources for both uplink and downlink.

[0073] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the second configuration information, the third configuration information, the fourth configuration information, or the fifth configuration information includes at least one of: a subcarrier spacing of the SBFD; a starting frequency or starting frequency band of the SBFD; a number of random access occasions of a random access channel (RACH) of the SBFD; an index of a random access configuration of the RACH of the SBFD; a number of synchronization signal blocks (SSBs) of each random access occasion of SBFD; a frequency domain length of a random access occasion of the SBFD; zero correlation zone configuration for a random access of the SBFD; a random access response window of the SBFD.

[0074] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein at least one of the fourth information, the fifth information, the eleventh information, or the twelfth information is indicated by first capability information including information related to whether a User Equipment (UE) supports the SBFD.

[0075] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein a downlink Radio resource control (RRC) message delivery message is transmitted by the first node to the second node wherein the RRC message transfer message includes at least one of: sixth configuration information related to Sub-band Full Duplex (SBFD) Contention Free Random Access (CFRA), sixteenth information associated with early uplink synchronization related to the SBFD; wherein an RRC reconfiguration message is transmitted by a second node to a user equipment (UE), wherein the RRC reconfiguration message includes at least one of the sixth configuration information or the sixteenth information; wherein an RRC reconfiguration complete message is received by the second node from the UE.

[0076] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein seventeenth information for timing advance (TA) acquisition is transmitted by the second node to the UE.

[0077] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the sixteenth information, or the seventeenth information includes at least one of: seventh configuration information associated with allocated resources for early uplink synchronization related to the SBFD; eighteenth information related to a type of allocated resources for early uplink synchronization; nineteenth information related to a type of an allocated random access occasion (RO).

[0078] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein the RRC reconfiguration message further includes at least one of: seventh configuration information, which includes information associated with resources for early uplink synchronization of time division duplex (TDD); eighth configuration information, which includes information associated with UE-specific TDD random access resources.

[0079] In combination with any of the above embodiments, according to the method performed by the third node in the communication system provided by the present disclosure, wherein a fourth request message is received by the third node, and the fourth request information includes twenty-first information related to requested resources for early uplink synchronization, and wherein if the fourth information is indicated by an ENUMERATED type, the twenty-first information is ignored.

[0080] According to another aspect of the present disclosure, there is provided a first node comprising: a transceiver configured to transmit and / or receive signals; and a controller configured to control the transceiver to perform the above method performed by the first node.

[0081] According to another aspect of the present disclosure, there is provided a second node comprising: a transceiver configured to transmit and / or receive signals; and a controller configured to control the transceiver to perform the above method performed by the second node.

[0082] According to another aspect of the present disclosure, there is provided a third node comprising: a transceiver configured to transmit and / or receive signals; and a controller configured to control the transceiver to perform the above method performed by the third node.

[0083] According to another aspect of the present disclosure, there is provided a user equipment UE comprising: a transceiver configured to transmit and / or receive signals; and a controller configured to control the transceiver to perform the above method performed by the UE.

[0084] According to another aspect of the present disclosure, there is provided a non-transitory computer-readable recording medium having stored thereon a program which, when being executed by a computer, performs any of the above methods.

[0085] Embodiments of the present disclosure provides an apparatus and method for effectively providing a service in a wireless communication system.

[0086] Figure 1 is an exemplary system architecture of System Architecture Evolution (SAE);

[0087] Figure 2 is an architectural schematic diagram of 5G according to various embodiments of the present disclosure;

[0088] Figure 3 is a first flow schematic diagram according to various embodiments of the present disclosure;

[0089] Figure 4 is a second flow schematic diagram according to various embodiments of the present disclosure;

[0090] Figure 5 is a third flow schematic diagram according to various embodiments of the present disclosure;

[0091] Figure 6 is a fourth flow schematic diagram according to various embodiments of the present disclosure;

[0092] Figure 7 is a fifth flow schematic diagram according to various embodiments of the present disclosure;

[0093] Figure 8a is a sixth flow schematic diagram according to various embodiments of the present disclosure;

[0094] Figure 8b is a sixth flow schematic diagram according to various embodiments of the present disclosure;

[0095] Figure 9 is a block diagram of a first node according to various embodiments of the present disclosure;

[0096] Figure 10 is a block diagram of a second node according to various embodiments of the present disclosure;

[0097] Figure 11 is a block diagram of a third node according to various embodiments of the present disclosure;

[0098] Figure 12 is a block diagram of a User Equipment (UE) according to various embodiments of the present disclosure;

[0099] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure, a clearly and complete description will be made with respect to the technical solutions of the embodiments of the present disclosure, in conjunction with the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are a part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary skilled in the art without creative labour belong to the protection scope of the present disclosure. In the present disclosure, elements expressed in the singular form may also be understood to be expressed in the plural form. Similar words such as singular forms "a", "an" or "the" do not express a limitation of quantity, but express the existence of at least one of the referenced item, unless the context clearly dictates otherwise. For example, reference to "a component surface" includes reference to one or more of such surfaces.

[0100] Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The term "couple" and its derivatives refer to any direct or indirect communication between two or more elements, whether those elements are in physical contact with one another. The terms "transmit," "receive," and "communicate," as well as derivatives thereof, encompass both direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and / or. The phrase "associated with," as well as derivatives thereof, means to include, be included within, interconnect to or with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, have a relationship to or with, or the like. The term "controller" means any device, system or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and / or firmware. The function associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase "at least one of," when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed. For example, "at least one of: A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C. For example, "at least one of A, B, or C " includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

[0101] In addition, various functions described below can be implemented or supported by one or more computer programs, each of which is formed by computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, related data or parts thereof appropriate for implementation in suitable computer-readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, objective code and executable code. The phrase "computer readable medium" includes any type of medium that can be accessed by a computer, such as Read-Only Memory (ROM), Random Access Memory (RAM), hard disk drive, compact disk (CD), digital video disk (DVD) or any other type of memory. A "non-transitory" computer-readable medium excludes wired, wireless, optical or other communication links that transfer transitory electrical or other signals. A non-transitory computer-readable medium includes a medium in which data can be stored permanently and a medium in which data can be stored and rewritten later, such as rewritable optical disks or erasable memory devices.

[0102] The terms used herein to describe the embodiments of the present application is not intended to limit and / or define the scope of the present application. For example, unless otherwise defined, the technical or scientific terms used in the present disclosure should have ordinary meanings as understood by ordinary skilled in the art to which the present application belongs.

[0103] It should be understood that "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Unless clearly indicated otherwise in the context, similar words such as "a", "an", "the" and the like in the singular form do not indicate a quantitative limitation, but indicate the existence of at least one.

[0104] As used herein, any reference to "one example" or "an example", "one embodiment" or "an embodiment" means that a particular element, feature, structure or characteristic described in conjunction with the embodiment is included in at least one embodiment. The appearances of the phrases "in one embodiment" or "in one example" in different places in the specification are not necessarily all referring to the same embodiment.

[0105] As used herein, "a part of" a certain thing means "at least some of" this thing, so it may mean being less than the entirety thereof or being the entirety thereof. Therefore, "a part of" the thing includes the whole thing as a special case, that is, an example in which the whole thing is a part of the thing.

[0106] It will be further understood that words such as "include", "contain" or the like means that the elements or objects appearing preceding the word encompass the elements or objects listed behind the word as well as their equivalents, without excluding other elements or objects. Words such as "connect", "interconnect" or the like are not limited to physical or mechanical connections, but may include electrical connection, whether direct or indirect. "Up", "Down", "Left" and "Right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, accordingly, the relative positional relationship may change as well.

[0107] The various embodiments discussed below for describing the principle of the present disclosure in this patent document are for illustration only, and should not be construed as limiting the scope of the present disclosure in any way. Those skilled in the art will understand that the principle of the present disclosure may be implemented in any suitably arranged wireless communication system. For example, although the following detailed description of the embodiments of the present disclosure will focus on LTE and 5G communication systems, those skilled in the art can understand that the main points of the present disclosure can also be applied to other communication systems with similar technical backgrounds and channel formats, with slight modifications and basically without departing from the scope of the present disclosure. The schemes of the embodiments of the present application may be applied to various communication systems. For example, the communication systems may include a Global System for Mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE frequency Division Duplex (FDD) system, LTE time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5th generation, 5G) system or New Radio (NR), etc. In addition, the schemes of the embodiments of the present application may be applied to future-oriented communication technologies. In addition, the schemes of the embodiments of the present application may be applied to future-oriented communication technologies.

[0108] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. The description includes various specific details to assist in that understanding but should be regarded as exemplary only. Accordingly, the ordinary skilled in the art will recognize that various changes and modifications to the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0109] The terms and wordings used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only, but not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0110] It should be understood that the singular forms "a," "an," and "the" include plural referents, unless clearly indicated otherwise in the context. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0111] The term "include" or "may include" refers to the existence of a corresponding disclosed function, operation or component which can be used in various embodiments of the present disclosure, and does not limit the existence of one or more additional functions, operations, or components. The terms "include" and / or "have" may be construed to represent certain feature, numbers, steps, operations, constituent elements, components or combinations thereof, but may not be construed to exclude the possibility of existence of one or more other feature, numbers, steps, operations, constituent elements, components or combinations thereof.

[0112] The term "or" used in various embodiments of the present disclosure includes any of the listed terms or all combinations thereof. For example, "A or B" may include A, may include B, or may include both A and B.

[0113] Unless defined differently, all terms used in the present disclosure, including technical or scientific terms, have the same meanings as those understood by the skilled in the art as described in the present disclosure. Common terms as defined in a dictionary are to be interpreted to have meanings consistent with the context in the relevant technical field o, and are not to be interpreted ideally or excessively, unless clearly defined as such in the present disclosure.

[0114] Figures discussed below and various embodiments for describing the principle of the present disclosure in this patent document are only for illustration, and should not be interpreted as limiting the scope of the present disclosure in any way. Those skilled in the art will understand that the principle of the present disclosure may be implemented in any suitably arranged system or device.

[0115] In order to meet an increasing demand for wireless data communication services since a deployment of 4G communication system, efforts have been made to develop an improved 5G or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called "beyond 4G network" or "post LTE system".

[0116] Wireless communication is one of the most successful innovations in modern history. Recently, a number of subscribers of wireless communication services has exceeded 5 billion, and it continues growing rapidly. With the increasing popularity of smart phones and other mobile data devices (such as tablet computers, notebook computers, netbooks, e-book readers and machine-type devices) in consumers and enterprises, a demand for wireless data services is growing rapidly. In order to meet rapid growth of mobile data services and support new applications and deployments, it is very important to improve efficiency and coverage of wireless interfaces.

[0117] Fig. 1 is an exemplary system architecture 100 of system architecture evolution (SAE). User equipment (UE) 101 is a terminal device for receiving data. An evolved universal terrestrial radio access network (E-UTRAN) 102 is a radio access network, which includes a macro base station (eNodeB / NodeB) that provides UE with interfaces to access the radio network. A mobility management entity (MME) 103 is responsible for managing mobility context, session context and security information of the UE. A serving gateway (SGW) 104 mainly provides functions of user plane, and the MME 103 and the SGW 104 may be in the same physical entity. A packet data network gateway (PGW) 105 is responsible for functions of charging, lawful interception, etc., and may be in the same physical entity as the SGW 104. A policy and charging rules function entity (PCRF) 106 provides quality of service (QoS) policies and charging criteria. A general packet radio service support node (SGSN) 108 is a network node device that provides routing for data transmission in a universal mobile telecommunications system (UMTS). A home subscriber server (HSS)109 is a home subsystem of the UE, and is responsible for protecting user information including a current location of the user equipment, an address of a serving node, user security information, and packet data context of the user equipment, etc.

[0118] Fig. 2 is an exemplary system architecture 200 according to various embodiments of the present disclosure. Other embodiments of the system architecture 200 can be used without departing from the scope of the present disclosure.

[0119] User equipment (UE) 201 is a terminal device for receiving data. A next generation radio access network (NG-RAN) 202 is a radio access network, which includes a base station (a gNB or an eNB connected to 5G core network 5GC, and the eNB connected to the 5GC is also called ng-gNB) that provides UE with interfaces to access the radio network. An access control and mobility management function entity (AMF) 203 is responsible for managing mobility context and security information of the UE. A user plane function entity (UPF) 204 mainly provides functions of user plane. A session management function entity SMF 205 is responsible for session management. A data network (DN) 206 includes, for example, services of operators, access of Internet and service of third parties.

[0120] Exemplary embodiments of the present disclosure are further described below with reference to the accompanying drawings.

[0121] The text and drawings are provided as examples only to help understand the present disclosure. They should not be construed as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, based on the disclosure herein, it is obvious to those skilled in the art that changes can be made to the illustrated embodiments and examples without departing from the scope of this disclosure.

[0122] Before introducing the specific content, some assumptions and some definitions of the present invention are given below.

[0123] * The message names in the present invention are only examples, and other message names can be used.

[0124] * The "first" and "second" included in the message name of the present invention are only examples of messages and do not represent the execution order.

[0125] * Detailed description of steps irrelevant to the present invention is omitted in the present invention.

[0126] * In the present invention, the steps in each procedure can be executed in combination with each other or independently. The execution steps of each process are only examples, and other possible execution orders are not excluded.

[0127] * In the present invention, the base station may be a 6G base station, a 5G base station (such as gNB, ng-eNB), a 4G base station (such as eNB), or other types of access nodes.

[0128] * In the present invention, the candidate cell refers to the target cell selected by the base station currently serving the UE for the UE or the next cell that may serve the UE. In intra-DU LTM, the candidate cell is managed by the DU currently serving the UE; in intra-CU inter-DU LTM, the candidate cell is managed by the candidate DU; in inter-gNB or inter-CU LTM, the candidate cell is managed by the target RAN node or the DU (distributed unit) of the target RAN node.

[0129] * In the present invention, UE (user equipment), user, user terminal, and user terminal equipment are equivalent.

[0130] * The description of "type" in the present invention can also be "mode", "way", "form", "category", etc., and is not limited to the word "type".

[0131] * The early uplink synchronization mentioned in the present invention may be equivalent to the early uplink random access.

[0132] * TA mentioned in the present invention refers to Timing Advance

[0133] Nodes involved in the present invention:

[0134] * First node: this node is a node device. In one example, the node may be a base station; in another example, the node may be an Access Point; in one example, if one base station contains multiple parts, the node may be a part of the base station, such as a central unit of the base station, a control plane part of the central unit of the base station, or a user plane part of the central unit of the base station.

[0135] * Second node: this node is a node device. In one example, if one base station contains multiple parts, the node is a Distributed Unit of the base station.

[0136] * Third node: this node may be the second node, or a node device distinct from the second node.

[0137] * Fourth node: this node is one user terminal equipment (UE) served by the first / second or fifth node.

[0138] * Fifth node: this node is a node device distinct from the first node.

[0139] * Sixth node: this node is a node device. In one example, the node may be a base station; in another example, the node may be an Access Point; in one example, if one base station contains multiple parts, the node may be a part of the base station, such as a central unit of the base station, a control plane part of the central unit of the base station, or a user plane part of the central unit of the base station. The sixth node and the first node may be the same node.

[0140] The base station involved in the above node can be one of the following types (and other types that can be used for user terminal access are not excluded):

[0141] * LTE base station

[0142] * 5G base station

[0143] * 6G base station

[0144] * NTN base station

[0145] * HAPS base station

[0146] * Drone base station

[0147] * WIFI Access Point

[0148] In the existing LTM mechanism, a source node can request resources for early uplink synchronization of a candidate cell. In the existing technology, requesting resources for early uplink synchronization of uplink slots of the time division duplex (TDD) results in low resource utilization and interferes system throughput. How to utilize resources more rationally is a problem that needs to be solved urgently.

[0149] Sub-band Full Duplex (SBFD) divides the legacy Time Division Duplex (TDD) carriers into different uplink / downlink sub-bands to achieve simultaneous uplink and downlink data transmission at the same time.

[0150] Various embodiments of the present disclosure provide a method performed by a first node in a communication system, comprising: transmitting a first request message to a third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of a requested random access occasion (RO); receiving a first response message from the third node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources; receiving a third notification message from the third node, wherein the third notification message includes first information related to a timing advance (TA); transmitting a fourth notification message to a second node, wherein the fourth notification message includes second information related to a timing advance (TA); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0151] Various embodiments of the present disclosure provide a method performed by a second node in a communication system, comprising: receiving a fourth notification message from a first node, wherein the fourth notification message includes second information related to a timing advance (TA); transmitting a first command message to a User Equipment (UE), wherein the first command message includes twentieth information related to the TA; wherein the fourth notification message is based on a third notification message received by the first node from a third node, wherein the third notification message includes first information related to a Timing advance (TA); wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources; wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of requested random access occasion (RO); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0152] Various embodiments of the present disclosure provide a method performed by a user equipment (UE) in a communication system, comprising: receiving seventeenth information for timing advance (TA) acquisition from a second node, transmitting a preamble to a third node, receiving a first command message from the second node, wherein the first command message includes twentieth information related to the TA, wherein the first command message is based on a fourth notification message transmitted by the first node to the second node, wherein the fourth notification message includes second information related to a Timing advance (TA); wherein the fourth notification message is based on a third notification message received by the first node from the third node, wherein the third notification message includes first information related to a Timing advance (TA); wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources,wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of a requested random access occasion (RO); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0153] Various embodiments of the present disclosure provide a method performed by a third node in a communication system, comprising: receiving a first request message from a first node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization and / or fifth information related to a type of a requested random access occasion (RO); transmitting a first response message to the first node, wherein the first response message includes first configuration information related to a first type of resources and / or second configuration information related to a second type of resources; transmitting a third notification message to the first node, wherein the third notification message includes first information related to a timing advance (TA); wherein a fourth notification message based on the third notification message is transmitted through the first node to a second node, wherein the fourth notification message includes second information related to a timing advance (TA); wherein the first information and / or the second information are used to determine a type of resources for early uplink synchronization associated with the TA; wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

[0154] Various embodiments of the present disclosure provide a process design related to resource allocation for early uplink synchronization. In the methods provided by various embodiments of the present disclosure, the CU or base station currently serving the UE can request resources for early uplink synchronization for SBFD for UEs with SBFD uplink synchronization capabilities (such as supporting SBFD mode recognition / awareness, supporting SBFD random access, etc.), so that the candidate cell can reserve resources for early uplink synchronization for SBFD, and can also reserve or allocate legacy resources for legacy UEs, thereby improving resource utilization, improving system throughput, and allocating and utilizing resources more reasonably.

[0155] LTM is a cell switch procedure, including: the base station making a decision to change the UE's serving cell based on the UE's layer 1 measurement report and notifying it to the UE through MAC CE. Before triggering a cell switch, or during preparation for switch, a source base station may request the candidate cell to allocate random access channel (RACH) resources for early synchronization.

[0156] Please refer to Figure 3, Figure 3 is a first flow schematic diagram according to various embodiments of the present disclosure. This embodiment proposes a solution for requesting and allocating for SBFD RACH resources in advance based on inter-DU LTM under CU-DU split architecture. As shown in Figure 3, this embodiment may include one or more steps among step S301 to step S304:

[0157] Step 301: a first node transmits a first request message to a third node. In LTM, the CU can request resources for early uplink synchronization or random access from the candidate DU through this message. If the base station supports SBFD, the CU can request SBFD resources for early uplink synchronization or random access from the candidate DU.

[0158] The message includes at least one of the following information or information list:

[0159] * related information for indicating requested resources for early uplink synchronization. The function of this information is to indicate information related to the requested resources for early uplink synchronizations to the candidate DU. The information may be at least one of the following information or a list of information:

[0160] ** indication information of a type of requested resources for early uplink synchronization (may also be called fourth information, or other IE names, which are not limited in any way by this disclosure). Herein, the indication information may indicate a first type of resources (type 1), a second type of resources (type 2), etc. Herein, the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), for example, a type that performs early uplink synchronization through TDD uplink subframes / uplink slots / uplink resources (hereinafter referred to as TDD uplink synchronization). The second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD), for example, a type that performs uplink synchronization through uplink synchronization resources of SBFD uplink subframes or SBFD uplink resources or SBFD symbols (hereinafter referred to as SBFD uplink synchronization). In addition to the above-mentioned first type of resources and second type of resources, the information may also indicate other types or ways of uplink synchronization resources.

[0161] In one implementation, the information may be explicit information, for example, the information is used to request configuration information for a type of random access, such as requesting configuration information for random access related to SBFD, requesting configuration information for early uplink synchronization related to SBFD, requesting configuration information for random access related to non-SBFD (TDD uplink synchronization), requesting configuration information for early uplink synchronization related to non-SBFD (TDD uplink synchronization), requesting configuration information for random access related to SFBD and configuration information for random access related to non-SBFD (legacy random access), requesting configuration information for early uplink synchronization related to SBFD and configuration information for early uplink synchronization related to non-SBFD (TDD uplink synchronization). The encoding method of this information can be ENUMERATED type, examples are as follows:

[0162] * ENUMERATED (typel, type2, both typel and type2...). The type1 and type2 can be TDD uplink synchronization resources, SBFD uplink synchronization resources or other uplink synchronization resources. In one implementation, this information is optional information. When this information element appears, the receiving end of this information can ignore another Request for RACH Configuration in the early synchronization information request (also called for the fourth request message, or other IE name, this disclosure does not limit this in any way), the fourth request information includes twenty-first information related to requested resources for early uplink synchronization. In another implementation, this information is mandatory information, and the receiving end of this information can ignore another Request for RACH Configuration in the early synchronization information request.

[0163] * ENUMERATED (type2, type2 only,...). type2 is the SBFD uplink synchronization resource type or other uplink synchronization resource types. In one implementation, when the information indicates type 2 only (that is, only type 2), the receiving end should consider that only resources for SBFD early uplink synchronization need to be reserved, and ignore another Request for RACH Configuration in the early synchronization information request. When the information indicates type2, the receiving end can decide whether to only allocate / reserve / feedback SBFD uplink synchronization resources according to its own implementation, or allocate / reserve / feedback SBFD uplink synchronization resources and TDD uplink synchronization resources at the same time.

[0164] * ENUMERATED (true,...). The information may also be a separate SBFD RACH resource type indication (e.g., SBFD RACH Request) to indicate that the requested RACH resource is an SBFD RACH resource.

[0165] In one implementation, the information may be implicit information, for example, the information is indicated by the capability information of the user equipment in the first request message. If the capability information of the user equipment includes first capability related information indicating support of SBFD (such as support of SBFD mode identification, support of SBFD random access, etc.), it means requesting configuration information for random access related to SBFD, or requesting configuration information for early uplink synchronization related to SBFD.

[0166] This information may be transmitted based on the candidate DU, in a parallel relationship with the LTM gNB-DU ID in terms of IE (Information Element) structure.

[0167] If this information is included in the first request message and the resources for early uplink synchronization type indicates SBFD, the second node (if supported) should include the SBFD early uplink synchronization information related to early TA acquisition of the accepted candidate cell in the response message of the message.

[0168] Indication information of a type of a requested RACH occasion (RO) (which may also be referred to as fifth information, or other IE name, which is not limited in any way by this disclosure), the indication information may indicate, for example: a first type (type 1) of RO including an RO related an uplink slot of the TDD (such as legacy RO); a second type (type 2) of RO including an RO related to an SBFD uplink sub-band (which may also be referred to as additional or newly added RO); or a third type (type 3) of RO including an RO corresponding to resources for both uplink and downlink (which may also be referred to as a flexible RO). The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type 1, type 2,...), ENUMERATED (type 1, type 2, type 3,...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO, respectively. The legacy RO refers to TDD uplink random access occasion, the additional RO refers to SBFD random access occasion, and the flexible RO refers to RO corresponding to flexible symbols / resources (which can be used for both uplink and downlink). In one embodiment, in addition to requesting a certain type of RO, any combination of the aforementioned types can also be requested, such as type l and type 2.

[0169] This information can also be a separate and an additional RO indication for SBFD, which is used to indicate that the requested random access occasion is a new RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true,...). This information may be transmitted based on the candidate DU, in a parallel relationship with the LTM gNB-DU ID in terms of IE structure. If this information is included in the first request message, and the random access type indicates SBFD, the second node (if supported) should include the SBFD early uplink synchronization information related to early TA acquisition of the accepted candidate cell in the response message of the message.

[0170] In one implementation, the information may be implicit information, for example, the information is indicated by the capability information of the user equipment in the first request message. If the capability information of the user equipment includes first capability related information indicating support of SBFD (such as support of SBFD mode identification, support of SBFD random access, etc.), it means requesting the RO for random access related to SBFD, or requesting the RO type for early uplink synchronization related to SBFD.

[0171] The function of the above-mentioned first request message is to transmit a LTM cell switch related request to the candidate DU(s) through the CU, such as a request for uplink synchronization resources. When LTM switch is prepared, the current candidate DU of the UE cannot know the information of the candidate DU(s) allocated to each UE under the source DU. Once a UE with the SBFD access capability is allocated to the candidate DU, the candidate DU can allocate SBFD uplink synchronization resources to UE for random access, while reserving legacy uplink synchronization resources to UEs without SBFD capability for random access. Because the CU decides to allocate candidate DU(s) to the UE, only the CU knows best which candidate DU(s) are allocated to UEs with the SBFD random access capability, so the CU can request the corresponding candidate DU(s) to allocate SBFD uplink synchronization resources. The benefit of this uplink synchronization resource request method is that it allows UE with the SBFD access capability to perform uplink synchronization through the uplink synchronization resources of SBFD, and more legacy resources can be reserved to users with only legacy random access capability, thereby helping the base station perform more reasonable resource allocation and improve spectrum efficiency.

[0172] The above-mentioned first request message may be a UE context setup request message, or a UE context modification request message, or other existing interface messages between CU and DU, or newly defined messages between CU and DU. The message can be a UE-associated message or a non-UE associated message.

[0173] Step 302: a third node transmits a first response message to the first node, wherein the message includes at least one of the following information or information list:

[0174] * configuration information related to SBFD for early uplink synchronization (which may also be called second configuration information, or other IE names, which this disclosure does not limit in any way). The function of this information is to indicate the candidate DU to accept the CU's SBFD uplink synchronization resource request, and / or deliver the configuration of SBFD uplink synchronization resources that the candidate DU can allocate. This information can be juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as optional information, or can be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as the SBFD uplink synchronization configuration of the DU corresponding to the LTM gNB-DU ID.

[0175] The configuration information can be transmitted in the following ways:

[0176] ** This information can be multiplexed into the configuration information related to uplink synchronization in the air interface protocol and transmitted between DU and CU in the form of a string (OCTET STRING).

[0177] ** The information may be an explicit information element transmitted between the DU and the CU, and the information may include at least one of the following information or information list:

[0178] *** a subcarrier spacing of the SBFD.

[0179] *** a starting frequency or starting frequency band of the SBFD, which can be an INTEGER value, such as INTEGER (0.. maxNrofPhysicalResourceBlocks-1), wherein maxNrofPhysicalResourceBlocks is the maximum number of Physical Resource Blocks.

[0180] *** a number of RACH random access occasions of the SBFD, which can be an ENUMERATED type, such as ENUMERATED {one, two, four, eight}.

[0181] *** an index of a RACH random access configuration of the SBFD, which can be an INTEGER value, such as INTEGER (0.. 255, ...) or INTEGER (263.. 299, ...), the maximum value defined in the information encoding can be any INTEGER greater than 0.

[0182] *** a number of SSBs of each SBFD random access occasion, which can be a value of ENUERMATED type, e.g. ENUMERATED 1 / 8, 1 / 4, 1 / 2, 1, 2, 4, 8, 16,...).

[0183] *** a frequency domain length of a SBFD random access occasion, which can be a value of CHOICE selection type, and the options can be L839, L139, L571, L1151, etc. Among them, if the value is L139, it means prach-RootSequenceIndex L = 139.

[0184] *** zero correlation zone configuration for a SBFD random access, which can be an INTEGER value, such as INTEGER (0.. 15,...), and the maximum value defined in the information encoding can be any INTEGER greater than 0.

[0185] *** a random access response window of the SBFD, which is used to indicate the length of SBFD random access response time window.

[0186] If the information is included in the first response message, the first node (if supported) should consider the information to be information related to SBFD early uplink synchronization of the candidate cell accepted by the third node.

[0187] * information indicating a type of resources for early uplink synchronization (which may also be called sixth information, or other IE names, and this disclosure does not impose any restrictions on this). The function of this information is to indicate the candidate DU to accept a request for the SBFD uplink synchronization resources of the CU, and / or indicate the candidate DU to feedback to the CU the type of uplink synchronization resources or the type of random access configuration allocated by the DU, such as the type of legacy uplink synchronization resources or the uplink synchronization resources through SBFD, or the type of other uplink synchronization resource. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2,...). The type1 and type2 can be the type of the TDD uplink synchronization, SBFD uplink synchronization or other uplink synchronization resource. This information may also be separate information indicating the SBFD random access type. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be used as optional information and juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as supplementary information of the RACH configuration. It can also be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as related information on the random access resources allocated / reserved / accepted by the DU corresponding to the LTM gNB-DU ID.

[0188] If this information is included in the first response message, the first node (if supported) should consider the random access resources reserved for early uplink synchronization by the candidate cell accepted by the third node as SBFD random access resources.

[0189] * information indicating a type of a random access occasion for early uplink synchronization (may also be referred to as seventh information, or other IE names, which this disclosure does not impose any restrictions on). The function of this information is to indicate the candidate DU to accept a request for the SBFD random access resources of the CU, and / or indicate the candidate DU to feedback the type of random access occasion allocated by the DU to the CU, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3,...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. The legacy RO refers to TDD uplink random access occasion, the additional RO refers to SBFD random access occasion, and the flexible RO refers to RO corresponding to flexible symbols / resources (which can be used for both uplink and downlink). In one embodiment, in addition to requesting a certain type of RO, any combination of the aforementioned types can also be requested, such as type l and type 2.

[0190] This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be used as optional information and juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as supplementary information of the RACH configuration. It can also be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as related information on the random access resources allocated / reserved / accepted by the DU corresponding to the LTM gNB-DU ID.

[0191] If this information is included in the first response message, the first node (if supported) should consider the random access resources reserved for early uplink synchronization by the candidate cell accepted by the third node as SBFD random access resources.

[0192] * LTM SBFD CFRA resource configuration information (which may also be referred to as third configuration information, or other IE names, which are not limited in any way by this disclosure). Herein, CFRA refers to Contention Free Random Access. This information is the dedicated SBFD CFRA random access resource configuration allocated by the candidate DU to the UE. When the UE does not obtain the TA information of uplink synchronization in advance, it can perform random access through the dedicated SBFD CFRA random access resource configuration. This information can contain the dedicated SBFD RACH configuration defined in TS38.331, which is transmitted from the DU to the CU through OCTECT STRING, or can be transmitted from the DU to the CU through an explicit information element. The information also includes at least one of the following information or information list:

[0193] ** information indicating a type of random access, such as legacy random access or random access type through SBFD, or other random access type. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, ...). The type1 and type2 can be TDD uplink random access, SBFD uplink random access or other random access types. This information may also be separate information indicating the SBFD random access type. In this case, the encoding method of this information is ENUMERATED (true, ...).

[0194] ** information indicating a type of a random access occasion, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3, ...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true, ...).

[0195] If the above LTM SBFD CFRA resource configuration information is included in the first response message, the first node (if supported) shall consider this information to be information related to a dedicated SBFD random access resources reserved by the third node for the fourth node.

[0196] The function of the above-mentioned first response message is to transmit a response to an LTM-related request to the CU, such as a response to a random access resource request. In the first request message, the CU transmits a request for SBFD random access resources to the candidate DU. Whether the DU accepts the request for SBFD random access resources of the CU, and the specific SBFD random access resource configuration that the DU can allocate can be transmitted to the CU through the second response message.

[0197] The above-mentioned first response message may be a UE context setup response message, or a UE context modification response message, or other existing interface messages between CU and DU, or newly defined messages between CU and DU. The message can be a message associated with the UE or a message not associated with the UE.

[0198] Step 303: The first node transmits a second request message to the second node, where the second request message includes information related to the random access configuration of the accepted candidate cell to the second node (which may also be referred to as the tenth information, or other IE names, which are not limited in any way by this disclosure), wherein the information related to the random access configuration of the accepted candidate cell includes at least one of the following information or information list:

[0199] * configuration information for early uplink synchronization, which includes the EarlyUL-SyncConfig IE of the air interface, transmitted through OCTECT STRING.

[0200] * configuration information related to SBFD for early uplink synchronization (which may also be called fourth configuration information, or other IE names, which this disclosure does not limit in any way). The function of this information is to transmit to the source DU the configuration of SBFD random access resources that the candidate DU can allocate / reserve. This information can be juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as optional information, or can be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as the SBFD random access configuration of the DU corresponding to the LTM gNB-DU ID.

[0201] If the information is included in the second request message, the second node (if supported) shall consider the information to be information related to SBFD early uplink synchronization of the candidate cell accepted by the third node.

[0202] The configuration information can be transmitted in the following ways:

[0203] ** This information can be multiplexed into the configuration information related to uplink synchronization in the air interface protocol and transmitted between DU and CU in the form of a string (OCTET STRING).

[0204] ** The information may be an explicit information element transmitted between the DU and the CU, and the information may include at least one of the following information or information list:

[0205] *** a subcarrier spacing of the SBFD.

[0206] *** a starting frequency or starting frequency band of the SBFD.

[0207] *** a number of RACH random access occasions of the SBFD.

[0208] *** an index of a RACH random access configuration of the SBFD.

[0209] *** a number of SSBs of each SBFD random access occasion.

[0210] *** a frequency domain length of a SBFD random access occasion.

[0211] *** zero correlation zone configuration for a SBFD random access.

[0212] * information indicating a type of resources for early uplink synchronization (which may also be referred to as fourteenth information, or other IE names, and this disclosure does not impose any limitations on this). The function of this information is to transmit to the source DU the type of uplink synchronization resources allocated / reserved by the candidate DU or the type of random access configuration, such as the type of legacy random access or the random access through SBFD, or the type of other random access. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, ...). The type1 and type2 can be the type of the TDD uplink synchronization, SBFD uplink synchronization or other uplink synchronization resource. This information may also be separate information indicating the SBFD random access type. In this case, the encoding method of this information is ENUMERATED (true, ...). This information can be used as optional information and juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as supplementary information of the RACH configuration. It can also be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as related information on the uplink synchronization resources allocated / reserved / accepted by the DU corresponding to the LTM gNB-DU ID. If this information is included in the second request message, the second node (if supported) should consider the resources reserved for early uplink synchronization by the candidate cell accepted by the third node as SBFD uplink synchronization resources.

[0213] * Information indicating a type of a random access occasion for early uplink synchronization (may also be referred to as fifteenth information, or other IE names, which this disclosure does not impose any restrictions on). The function of this information is to transmit to the source DU the type of random access occasion allocated / reserved by the candidate DU, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3, ...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true, ...). This information can be used as optional information and juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as supplementary information of the RACH configuration. It can also be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as related information on the uplink synchronization resources allocated / reserved / accepted by the DU corresponding to the LTM gNB-DU ID. If this information is included in the second request message, the second node (if supported) should consider the resources reserved for early uplink synchronization by the candidate cell accepted by the third node as SBFD uplink synchronization resources.

[0214] * LTM SBFD CFRA resource configuration information (which may also be referred to as fifth configuration information, or other IE names, which are not limited in any way by this disclosure). Herein, CFRA refers to Contention Free Random Access. This information is the dedicated SBFD CFRA random access resource configuration allocated by the candidate DU to the UE. When the UE does not obtain the TA information of uplink synchronization in advance, it can perform random access through the dedicated SBFD CFRA random access resource configuration. This information can contain the dedicated SBFD RACH configuration defined in TS38.331, which is transmitted from the DU to the CU through OCTECT STRING, or can be transmitted from the DU to the CU through an explicit information element. The information also includes at least one of the following information or information list:

[0215] ** information indicating a type of random access, such as legacy random access or random access type through SBFD, or other random access type. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, ...). The type1 and type2 can be TDD uplink random access, SBFD uplink random access or other random access types. This information may also be separate information indicating the SBFD random access type. In this case, the encoding method of this information is ENUMERATED (true, ...).

[0216] ** information indicating a type of a random access occasion, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3, ...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true, ...).

[0217] If the above LTM SBFD CFRA resource configuration information is included in the second request message, the second node (if supported) shall consider this information to be information related to a dedicated SBFD random access resource reserved by the third node for the fourth node and use this information for LTM cell switch.

[0218] The function of the above-mentioned second request message is to convey information on random access resources of the candidate DU to the source DU. For example, after the source DU obtains the early uplink synchronization configuration information of the candidate cell of the UE, it can transmit the corresponding early Time Advance (TA) acquisition command to the UE based on the information. If the type of the resources for early uplink synchronization is SBFD, the source DU will add corresponding information to the early TA acquisition command to the UE to indicate the UE to perform early uplink synchronization through the resources for early uplink synchronization of SBFD.

[0219] The above-mentioned second request message may be a UE context setup request message, or a UE context modification request message, or other existing interface messages between CU and DU, or newly defined messages between CU and DU. The message can be a message associated with the UE or a message not associated with the UE.

[0220] Step 304: The second node transmits a second response message to the first node, wherein the function of this message is to transmit to the first node a response regarding the random access configuration information or uplink synchronization information of the accepted candidate cell. The message includes at least one of the following information or information list:

[0221] * confirmation or response information for SBFD random access configuration information for early uplink synchronization.

[0222] * confirmation or response information for a type of random access configuration for early uplink synchronization.

[0223] * confirmation or response information for a type of random access occasion for early uplink synchronization.

[0224] * acknowledgement or response information for LTM SBFD CFRA resource configuration information.

[0225] The function of the above second response message is to transmit confirmation information from the source DU to the random access resources or early uplink synchronization related information allocated by the candidate DU to the CU. The message may be a UE context setup response message, or a UE context modification response message, or an existing interface message between CU and DU, or a newly defined message between CU and DU. The message can be a message associated with the UE or a message not associated with the UE.

[0226] In the above embodiment, for inter-DU LTM, the first node is the source CU, the second node is the source DU, and the third node is the candidate DU. The above embodiment can also be applied to intra-DU LTM, that is, the first node is the source CU, and the second node and the third node are the same DU, that is, the DU currently serving the UE.

[0227] One implementation of the above embodiment in intra-CU inter-DU LTM is that when the CU selects candidate DU for the UE, it allocates UEs with SBFD identification / awareness capabilities (or SBFD uplink access capabilities) to the same candidate DU with SBFD uplink resources, and allocates UEs without SBFD identification / awareness capabilities to other DUs. The benefit of this implementation method is that the SBFD uplink synchronization resources available to the DU can be fully reserved for UEs with SBFD identification capabilities for uplink access, reducing the waste of SBFD uplink access resources, and maximizing resource utilization.

[0228] The above-mentioned embodiment of the present disclosure provides a process design related to resource allocation for early uplink synchronization. In the methods provided by various embodiments of the present disclosure, the CU or base station currently serving the UE can request resources for early uplink synchronization for SBFD for UEs with SBFD uplink synchronization capabilities (such as supporting SBFD mode recognition / awareness, supporting SBFD random access, etc.), so that the candidate cell can reserve resources for early uplink synchronization for SBFD, and can also reserve or allocate legacy resources for legacy UEs, thereby improving resource utilization, improving system throughput, and allocating and utilizing resources more reasonably.

[0229] During the LTM preparation process, the CU will transmit the generated LTM configuration to the source DU through a downlink RRC message, and the source DU transmits the LTM configuration to the UE through an RRC reconfiguration message, which contains the uplink synchronization resource information required by the UE for uplink access.

[0230] Please refer to Figure 4, Figure 4 is a second flow schematic diagram according to various embodiments of the present disclosure. The following embodiment presents a corresponding solution for LTM when SBFD is involved. As shown in Figure 4, this embodiment may include one or more steps from steps S401 to S403.

[0231] Step 401: The first node transmits a downlink RRC message transfer message to the second node, the function of which is to transmit the RRC message containing the LTM configuration generated by the CU to the DU. In addition to the existing LTM configuration, the message also includes at least one of the following information or information list:

[0232] * dedicated SBFD random access configuration (which can also be called sixth configuration information, or other IE names, which are not limited in any way by this disclosure). This information is configuration information related to random access to which SBFD is applied, which is different from legacy time and frequency resources used for random access are different. Define and transmit the SBFD random access configuration and the legacy random access configuration separately, which is more convenient for network implementation and can avoid the intersection or duplication of information. The information includes at least one of the following information or information list:

[0233] ** a subcarrier spacing of the SBFD.

[0234] ** an index of a RACH random access configuration of the SBFD, which can be an INTEGER value, such as INTEGER (0.. 255,...) or INTEGER (263.. 299,...), the maximum value defined in the information encoding can be any INTEGER greater than 0.

[0235] ** a number of RACH random access occasions of the SBFD (FDM), which can be an ENUMERATED type, such as ENUMERATED {one, two, four, eight}.

[0236] ** a starting frequency or starting frequency band of the SBFD, which can be an INTEGER value, such as INTEGER (0.. maxNrofPhysicalResourceBlocks-1), wherein maxNrofPhysicalResourceBlocks is the maximum number of Physical Resource Blocks.

[0237] ** a frequency domain length of a SBFD random access occasion, which can be a value of CHOICE selection type, and the options can be L839, L139, L571, L1151, etc.

[0238] ** zero correlation zone configuration for a SBFD random access, which can be an INTEGER value, such as INTEGER (0.. 15,...), and the maximum value defined in the information encoding can be any INTEGER greater than 0.

[0239] ** a random access response window of the SBFD, which is used to indicate the length of SBFD random access response time window, which can be an ENUMERATED type, such as {sl1, sl2, sl4, sl8, sl10, sl20, sl40, sl80}.

[0240] * information including SBFD random access related information used by the UE for early uplink synchronization (also referred to as sixteenth information, or other IE names, which are not limited in any way by this disclosure), and the information includes at least one of the following information or information list:

[0241] ** configuration information related to SBFD for early uplink synchronization (which may also be referred to as seventh configuration information, or other IE names, which are not limited in any way by this disclosure), the specific content is as described in step 302.

[0242] ** information indicating a type of resources for early uplink synchronization (may also be referred to as eighteenth information, or other IE names, which are not limited in any way by this disclosure), and the specific content is as described in step 302.

[0243] ** information indicating a type of a random access occasion for early uplink synchronization (may also be referred to as nineteenth information, or other IE names, which are not limited in any way by this disclosure), and the specific content is as described in step 302.

[0244] Step 402: The second node transmits an RRC reconfiguration message to the fourth node. In addition to the existing LTM configuration information, the message also includes at least one of the information listed in step 401. The function of this message is to transmit SBFD random access related information to the UE, including dedicated random access configuration information and SBFD random access related information used for early uplink synchronization of the UE. In one implementation, the information also includes dedicated TDD uplink random access configuration information (which may also be referred to as eighth configuration information, or other IE names, which this disclosure does not place any restrictions on) and TDD random access related information used for early uplink synchronization of the UE (which may also be referred to as seventh configuration information, or other IE names, which this disclosure does not place any restrictions on).

[0245] Step 403: the fourth node transmits an RRC reconfiguration complete message to the second node.

[0246] In the above embodiment, for inter-DU LTM, the first node is the source CU, and the second node is the source DU. The above embodiment can also be applied to intra-DU LTM, that is, the first node is the source CU, and the second node is the DU currently serving the UE.

[0247] The above embodiment provides a process design related to resource allocation for early uplink synchronization. In the methods provided by various embodiments of the present disclosure, the CU or base station currently serving the UE can transmit the resources for early uplink synchronization and / or random access resources allocated by the candidate cell to the UE, so that the UE can timely perform uplink synchronization on the allocated resources for early uplink synchronization or random access.

[0248] In inter-DU LTM, the source DU triggers the UE to perform early uplink synchronization through a physical downlink control channel command (PDCCH order), that is, early TA acquisition. Please refer to Figure 5, Figure 5 is a third flow schematic diagram according to various embodiments of the present disclosure. The following embodiments propose a related solution including SBFD early uplink synchronization. As shown in Figure 5, this embodiment may include one or more steps from step 501 to step 505.

[0249] Step 501: a second node transmits information for early TA acquisition (which may also be referred to as the seventeenth information, or other IE names, this disclosure does not place any restrictions on this) to a fourth node, such as PDCCH order, this information contains information related to resources used by the UE for early uplink synchronization, and its function is to trigger the UE to transmit a preamble to the candidate cell to perform early uplink synchronization.

[0250] When the early uplink synchronization of the UE involves SBFD uplink synchronization, the early TA acquisition of UE based on SBFD is performed through CFRA triggered by the PDCCH order transmitted by the source cell. At this time, the PDCCH order contains information related to the SBFD resources used by the UE for early uplink synchronization. This information can inform the UE to transmit a preamble through the SBFD uplink synchronization resources reserved by the candidate DU to perform early uplink synchronization. The information includes at least one of the following information or information list:

[0251] * configuration information related to SBFD for early uplink synchronization (which may also be referred to as seventh configuration information, or other IE names, which this disclosure does not limit in any way). The function of this information is to inform the UE about the time and frequency information of SBFD early uplink synchronization. The information includes at least one of the following information or information list:

[0252] ** a subcarrier spacing of the SBFD.

[0253] ** a starting frequency or starting frequency band of the SBFD.

[0254] ** a number of RACH random access occasions of the SBFD.

[0255] ** an index of a RACH random access configuration of the SBFD.

[0256] ** a number of SSBs of each SBFD random access occasion.

[0257] ** a frequency domain length of a SBFD random access occasion.

[0258] ** zero correlation zone configuration for a SBFD random access.

[0259] ** a random access response window of the SBFD.

[0260] * information indicating a type of resources for early uplink synchronization (which may also be referred to as eighteenth information, or other IE names, and this disclosure does not impose any limitations on this). The function of this information is to inform the UE of the type of resources for early uplink synchronization to use. In one implementation, the UE receives two early uplink synchronization configurations (such as TDD uplink synchronization, SBFD uplink synchronization) in the previous step (for example, step 402). If the information in this step indicates a SBFD random access type, then when performing early uplink synchronization, the UE needs to use the corresponding SBFD uplink synchronization resources to transmit a preamble to the candidate cell, but not use the TDD uplink synchronization resources to transmit the preamble.

[0261] * information indicating a type of a random access occasion for early uplink synchronization (may also be referred to as nineteenth information, or other IE names, which this disclosure does not impose any restrictions on). The function of this information is to inform the UE of the type of an occasion for early random access. In one implementation, the UE receives two early uplink synchronization configurations (such as TDD uplink synchronization, SBFD uplink synchronization) in the previous step (for example, step 402). If the information in this step indicates a new random access occasion for SBFD, when performing early uplink synchronization, the UE needs to use the corresponding newly added uplink random access occasion for early uplink synchronization, but not use the TDD uplink random access occasion for early uplink synchronization.

[0262] In addition to the PDCCH order, the information transmitted in step 501 can also be transmitted through other lower layer or high layer information, such as downlink control information (DCI), Medium Access Control Control Element (MAC CE), radio resource control (RRC) signaling, etc.

[0263] Step 501-a: the second node transmits a first notification message to the first node, wherein the message contains the information related to the SBFD random access used by the UE for early uplink synchronization listed in step 501. If the aforementioned information is included in the first notification message, the first node should (if supported) forward the information to the second node in a second notification message.

[0264] The message may be a UE context setup request message, or a UE context modification request message, or other existing interface messages between CU and DU, or newly defined messages between CU and DU. The message can be a message associated with the UE or a message not associated with the UE.

[0265] Optionally, after receiving the first notification message, the first node may transmit a first notification response message to the second node, which is not shown in the figure. The first notification response message may be a UE context setup response message, or a UE context modification response message, or other existing interface messages between CU and DU, or newly defined messages between CU and DU. The message can be a message associated with the UE or a message not associated with the UE.

[0266] Step 501-b: The first node transmits a second notification message to the third node, wherein the message contains the information related to the SBFD random access used for early uplink synchronization of the UE listed in step 501. If the aforementioned information is included in the second notification message, the third node (if supported) should use the information for parsing the preamble. The message may be a UE context setup request message, or a UE context modification request message, or other existing interface messages between CU and DU, or newly defined messages between CU and DU. The message can be a message associated with the UE or a message not associated with the UE.

[0267] Optionally, after receiving the second notification message, the first node may transmit a second notification response message to the second node, which is not shown in the figure. The second notification response message may be a UE context setup response message, or a UE context modification response message, or other existing interface messages between CU and DU, or newly defined messages between CU and DU. The message can be a message associated with the UE or a message not associated with the UE.

[0268] The function of the above steps 501-a and 501-b is to transmit random access related information used by the UE for early uplink synchronization to the candidate DU through the CU. In the legacy mechanism, the source DU will not transmit random access related information used by the UE for early uplink synchronization to the candidate DU. After receiving the preamble of the UE, the candidate DU will parse the preamble in all uplink synchronization resources, which takes longer time. After obtaining the random access related information used by the UE for early uplink synchronization, the candidate DU can parse the preamble in the corresponding uplink synchronization resource, which can reduce processing delay to a certain extent.

[0269] It should be noted that steps 501-a and 501-b can occur before step 501, after step 501, or after step 501. Step 501-a and step 501-b can be messages in the existing LTM process, or they can be newly added messages outside the existing LTM process.

[0270] Step 502: a fourth node transmits a preamble to the third node according to the information in step 501.

[0271] Step 503: a third node transmits a third notification message to the first node, wherein the third notification message includes related information for transmitting the timing advance (TA) value of the candidate cell to the CU. When SBFD uplink synchronization resources are involved, in addition to the information in the DU-CU TA information transfer message, the message includes at least one of the following information or information list:

[0272] * information identifying a candidate cell, such as NR CGI.

[0273] * first information related to timing advance (TA), which is the information related to the uplink synchronization resources actually used by the UE to perform early uplink synchronization. The information includes at least one of the following:

[0274] ** information indicating a type of resources used by the UE for early uplink synchronization (which may also be called eighth information, or other IE names, and this disclosure does not impose any restrictions on this). The function of this information is to indicate the type of resources used for early uplink synchronization corresponding to the current TA value, such as legacy uplink synchronization or uplink synchronization type through SBFD, or other uplink synchronization types. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2,...). The type1 and type2 can be TDD uplink synchronization, SBFD uplink synchronization or other uplink synchronization. This information may also be separate information indicating the type of the SBFD uplink synchronization resource. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be juxtaposed with the candidate cell ID as optional information. If the information is included in the third notification message, the first node (if supported) should forward the information to the second node in a fourth notification message.

[0275] ** information indicating a type of a random access occasion used by the UE for early uplink synchronization (which may also be referred to as ninth information, or other IE names, and this disclosure does not place any restrictions on this). The function of this information is to indicate the type of random access occasion used for early uplink synchronization corresponding to the current TA value, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3,...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. The legacy RO refers to TDD uplink random access occasion, the additional RO refers to SBFD random access occasion, and the flexible RO refers to RO corresponding to flexible symbols / resources (which can be used for both uplink and downlink).This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be juxtaposed with the candidate cell ID as optional information. If the information is included in the third notification message, the first node (if supported) should forward the information to the second node in a fourth notification message.

[0276] ** a new or additional preamble index. This information is used to indicate the preamble index used by the UE in addition to the existing preambles, such as a new index for SBFD random access. The information can be an INTEGER value starting at 64, such as INTEGER (64.. 127,...), and the maximum value of the INTEGER value can be any INTEGER not less than 64. If the information is included in the third notification message, the first node (if supported) should forward the information to the second node in a fourth notification message.

[0277] ** SBFD-RA-RNTI (also called first user information, or other IE names, which are not limited in this disclosure), information for identifying the UE that performs random access through SBFD.

[0278] The above-mentioned third notification message can be a DU-CU TA information transfer message in the existing LTM process, or a newly added message not included in the existing LTM process.

[0279] Step 504: the first node transmits a fourth notification message to the second node, the function of which is to transmit information related to the TA value of the candidate cell to the source DU. This message can be a CU-DU TA information transfer message in the existing LTM process, or it can be a newly added message not included in the existing LTM process. The message includes second information related to the timing advance (TA), wherein the second information includes the information listed in step 503, the message is a non-UE related message, and the first information and / or the second information can be used to determine the type of resources for early uplink synchronization associated with the timing advance (TA). The second node can determine the UE corresponding to the TA value based on this information.

[0280] If the aforementioned information is included in the fourth notification message, the second node should use this information to trigger LTM cell switch of the UE.

[0281] The function of the above steps 503 and 504 is to transmit information related to the TA value of the candidate cell to the source DU through the CU. This information can be used to trigger LTM cell switch.

[0282] Step 505: the second node transmits a first command message to the fourth node, which message includes the twentieth information related to the TA (which may also be referred to as the twentieth information, or other IE names, which this disclosure does not apply any restrictions), such as transmitting the TA value of the target cell to the fourth node to trigger the UE to perform cell switch. This message can be a cell switch command (cell switch command) in the existing LTM process, or other lower layer or high layer signaling, such as MAC CE, DCI, RRC signaling, etc. After receiving this message, if the fourth node does not perform early uplink synchronization and the fourth node receives the dedicated SBFD random access configuration, the fourth node uses the dedicated SBFD random access resources to perform the random access process.

[0283] In the above embodiment, for inter-DU LTM, the first node is the source CU, the second node is the source DU, the third node is the candidate DU, and the fourth node is the UE. The above embodiment can also be applied to intra-DU LTM, that is, the first node is the source CU, the second node and the third node are the same node (ie, the DU currently serving the UE), and the fourth node is the UE. In the intra-DU LTM scenario, steps 501-a, 501-b, 503 and 504 can be omitted.

[0284] The above-mentioned embodiment provides a process design related to resource allocation for early uplink synchronization. In the methods provided by various embodiments of the present disclosure, the CU or base station currently serving the UE can request resources for early uplink synchronization for SBFD for UEs with SBFD uplink synchronization capabilities (such as supporting SBFD mode recognition / awareness, supporting SBFD random access, etc.), so that the candidate cell can reserve resources for early uplink synchronization for SBFD, and can also reserve or allocate legacy resources for legacy UEs, thereby improving resource utilization, improving system throughput, and allocating and utilizing resources more reasonably. Specifically, the CU or base station currently serving the UE can notify the UE at an appropriate time to perform early uplink synchronization on the reserved resources, obtain TA in advance, and synchronize to the candidate cell faster.

[0285] In inter-gNB LTM (or inter-CU LTM), a source base station (or CU of a source base station) may transmit an LTM related request message to one or more target base stations (or CU of the target base station), requesting the target base stations to prepare LTM related resources.

[0286] Please refer to Figure 6, Figure 6 is a fourth flow schematic diagram according to various embodiments of the present disclosure. A solution for LTM for Inter-gNB (or Inter-CU) involving SBFD is proposed in the following embodiments. As shown in Figure 6, this embodiment may include one or more steps from steps S601 to S604:

[0287] Step 601: a fifth node transmits a third request message to a sixth node, the message includes at least one of the following information or information list:

[0288] * an LTM cell switch request. The function of this message is to transmit a request for LTM cell switch to the target base station.

[0289] * an LTM candidate DU identification or identification list, which is used to indicate the requested LTM candidate DU.

[0290] * information related to requested resources for early uplink synchronization type. The function of this message is to request resources for early uplink synchronization from the target base station. The information includes at least one of the following information or information list:

[0291] ** indication information of a type of requested resources for early uplink synchronization (may also be referred to as eleventh information, or other IE names, which are not limited in any way by this disclosure), and the function of this information is to indicate information related to the requested random access resources to the target base station. The information includes at least one of the following information or information list:

[0292] a type of random access, such as a legacy or existing random access type, or SBFD random access type, or other random access type. See step 301 for the specific implementation of this information.

[0293] In one implementation, the information may be implicit information, such as the information indicated by the capability information of the user equipment in the first request message. If the capability information of the user equipment includes capability related information indicating support of SBFD (such as support of SBFD mode identification, support of SBFD random access, etc.), it means a request for configuration information for random access related to SBFD, or a request for configuration information for early uplink synchronization related to SBFD.

[0294] ** indication information of a type of a requested random access occasion (which may also be referred to as twelfth information, or other IE name, which is not limited in any way by the present disclosure), such as a legacy RO, an additional or newly added RO, or a flexible RO. See step 301 for the implementation of the encoding method of this information. This information may be transmitted based on the candidate DU, in a parallel relationship with the LTM gNB-DU ID in terms of the information element structure.

[0295] In one implementation, the information may be implicit information, such as the information indicated by the capability information of the user equipment in the first request message. If the capability information of the user equipment includes capability related information indicating support of SBFD (such as support of SBFD mode identification, support of SBFD random access, etc.), it means a request for a RO type for random access related to SBFD, or a request for a RO type for early uplink synchronization related to SBFD.

[0296] If this information is included in the third request message, and the random access type indicates SBFD, the sixth node (if supported) should include SBFD early uplink synchronization information related to the early TA acquisition of the accepted cell in the response message of the message.

[0297] The above third request message may be a switch request message, or an LTM configuration update message, or other existing or newly defined Xn interface messages. The message can be a UE-associated message or a non-UE-associated message.

[0298] Step 602: a sixth node transmits a third response message to a fifth node, wherein the third response message includes thirteenth information related to the configuration of early synchronization of the candidate cell, where the thirteenth information includes at least one of the following information or information list:

[0299] * configuration information related to SBFD for early uplink synchronization (which may also be called fourth configuration information, or other IE names, which this disclosure does not limit in any way). The function of this information is to indicate the target base station (or the candidate DU of the target base station) to accept a request for the SBFD uplink synchronization resources of the source base station, and / or transmit the configuration of the SBFD uplink synchronization resources that the target base station can allocate. This information can be juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as optional information, or can be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as the SBFD random access configuration of the DU corresponding to the LTM gNB-DU ID.

[0300] The configuration information can be transmitted in the following ways:

[0301] ** This information can be reused the configuration information related to uplink synchronization in the air interface protocol, and transmitted between base stations in the form of string (OCTET STRING).

[0302] ** The information may be an explicit information element transmitted between base stations, and the information includes at least one of the following information or information list:

[0303] *** a subcarrier spacing of the SBFD.

[0304] *** a starting frequency or starting frequency band of the SBFD.

[0305] *** a number of RACH random access occasions of the SBFD.

[0306] *** an index of a RACH random access configuration of the SBFD.

[0307] *** a number of SSBs of each SBFD random access occasion.

[0308] *** a frequency domain length of a SBFD random access occasion.

[0309] *** zero correlation zone configuration for a SBFD random access.

[0310] *** a random access response window of the SBFD.

[0311] If the information is included in the third response message, the fifth node (if supported) should consider the information to be information related to the SBFD early uplink synchronization of the candidate cell accepted by the sixth node.

[0312] * information indicating a type of resources for early uplink synchronization (which may also be referred to as fourteenth information, or other IE names, and this disclosure does not impose any limitations on this). The function of this information is to indicate the target base station (or the candidate DU of the target base station) to accept a request for the SBFD uplink synchronization resources of the source base station, and / or indicate the target base station to feedback to the source base station the type of uplink synchronization resources or the type of random access configuration by the target base station, such as the type of legacy random access or the random access through SBFD, or the type of other random access. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2,...). The type1 and type2 can be the type of the TDD uplink synchronization, SBFD uplink synchronization or other uplink synchronization resource. This information may also be separate information indicating the SBFD random access type. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be used as optional information and juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as supplementary information of the RACH configuration. It can also be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as related information on the uplink synchronization resources allocated / reserved / accepted by the DU corresponding to the LTM gNB-DU ID.

[0313] * information indicating a type of a random access occasion for early uplink synchronization (may also be referred to as fifteenth information, or other IE names, which this disclosure does not impose any restrictions on). The function of this information is to indicate the candidate DU to accept a request for the SBFD uplink synchronization resources of the CU, and / or indicate the candidate DU to feedback the type of the random access occasion allocated by the DU to the CU, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3,...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. The legacy RO refers to TDD uplink random access occasion, the additional RO refers to SBFD random access occasion, and the flexible RO refers to RO corresponding to flexible symbols / resources (which can be used for both uplink and downlink).This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be used as optional information and juxtaposed with the existing RACH configuration in the early uplink synchronization configuration as supplementary information of the RACH configuration. It can also be juxtaposed with the LTM gNB-DU ID in the early uplink synchronization configuration as related information on the uplink synchronization resources allocated / reserved / accepted by the DU corresponding to the LTM gNB-DU ID.

[0314] * LTM SBFD CFRA resource configuration information (which may also be referred to as fifth configuration information, or other IE names, which are not limited in any way by this disclosure). Herein, CFRA refers to Contention Free Random Access. This information is the dedicated SBFD CFRA random access resource configuration allocated by the candidate DU to the UE. When the UE does not obtain the TA information of uplink synchronization in advance, it can perform random access through the dedicated SBFD CFRA random access resource configuration. This information can contain the dedicated SBFD RACH configuration defined in TS38.331, which is transmitted from the DU to the CU through OCTECT STRING, or can be transmitted from the DU to the CU through an explicit information element. The information also includes at least one of the following information or information list:

[0315] ** information indicating a type of random access, such as legacy random access or random access type through SBFD, or other random access type. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2,...). The type1 and type2 can be TDD uplink random access, SBFD uplink random access or other random access types. This information may also be separate information indicating the SBFD random access type. In this case, the encoding method of this information is ENUMERATED (true,...).

[0316] ** information indicating a type of a random access occasion, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3,...), herein, type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true,...).

[0317] * a transparent container transmitted by the target base station to the source base station. This message is transmitted in OCTET STRING format between base stations and can contain the LTM configuration information generated by the target base station.

[0318] * an LTM reference configuration. This message is transmitted between base stations in OCTET STRING format.

[0319] * a CSI-RS configuration. This message is transmitted between base stations in OCTET STRING format.

[0320] The above-mentioned third response message may be a Handover Request Acknowledge message, an LTM Configuration Update Acknowledge message, or other existing or newly defined Xn interface messages. The message can be a UE-associated message or a non-UE associated message.

[0321] Step 603: the fifth node transmits an RRC reconfiguration message to the fourth node. In addition to the information in the existing RRC reconfiguration message, the message also contains at least one of the information listed in step 602. In one implementation, the information includes both the information listed in step 602 and information related to the TDD uplink random access configuration.

[0322] Step 604: the fourth node transmits an RRC reconfiguration complete message to the fifth node.

[0323] It should be noted that the sixth node in the above embodiment and its corresponding flow diagram (Figure 6) may also be the first node.

[0324] The above embodiment provides a process design related to resource allocation for early uplink synchronization. In the methods provided by various embodiments of the present disclosure, the CU or base station currently serving the UE can request resources for early uplink synchronization of the SBFD from the target base station or the CU of the target base station for UEs with SBFD uplink synchronization capabilities (such as supporting SBFD mode identification, supporting SBFD random access, etc.), so that the candidate cell of the target base station can reserve resources for early uplink synchronization of the SBFD, and can also reserve or allocate legacy resources for early uplink synchronization for legacy UEs, thereby improving the resource utilization, the system throughput, and allocating and utilizing resources more reasonably.

[0325] In Inter-gNB or Inter-CU LTM, the source base station (or CU of the source base station) can transmit information related to early uplink synchronization to the UE to trigger the UE to perform early TA acquisition and perform early uplink synchronization.

[0326] Please refer to Figure 7, Figure 7 is a fifth flow schematic diagram according to various embodiments of the present disclosure. The following embodiments propose an early uplink synchronization solution involving SBFD random access. As shown in Figure 7, this embodiment may include one or more steps from steps S701 to S704:

[0327] Step 701: a fifth node transmits information for early TA acquisition, such as PDCCH order, to a fourth node. This information contains random access related information used by the UE for early uplink synchronization, and its function is to trigger the UE to transmit a preamble to the candidate cell to perform early uplink synchronization.

[0328] The information includes at least one of the following information or information list:

[0329] * Configuration information for early uplink synchronization related to SBFD. The function of this information is to inform the UE about the time-frequency information of SBFD early uplink synchronization. The information includes at least one of the following information or information list:

[0330] ** a subcarrier spacing of the SBFD.

[0331] ** a starting frequency or starting frequency band of the SBFD.

[0332] ** a number of RACH random access occasions of the SBFD.

[0333] ** an index of a RACH random access configuration of the SBFD.

[0334] ** a number of SSBs of each SBFD random access occasion.

[0335] ** a frequency domain length of a SBFD random access occasion.

[0336] ** zero correlation zone configuration for a SBFD random access.

[0337] ** a random access response window of the SBFD.

[0338] * information indicating resources for early uplink synchronization. The function of this information is to inform the UE of the type of resources for early uplink synchronization to use. In one implementation, the UE receives two early uplink synchronization configurations (such as TDD uplink synchronization, SBFD uplink synchronization) in the previous steps (for example, step 603). If the information indicates the SBFD uplink synchronization resource type, then when performing early uplink synchronization, the UE needs to use the corresponding SBFD uplink synchronization resource to transmit the preamble to the candidate cell, but not use the TDD uplink synchronization resource to transmit the preamble.

[0339] * information indicating a type of a random access occasion for early uplink synchronization. The function of this information is to inform the UE of the type of an occasion for early random access. In one implementation, the UE receives two early uplink random access configurations (such as TDD uplink random access, SBFD random access) in the preamble step (such as step 402). If the information in this step indicates a newly added random access occasion for SBFD, when performing early uplink synchronization, the UE needs to use the corresponding newly added uplink random access occasion for early uplink synchronization, but not use the TDD uplink random access occasion for early uplink synchronization.

[0340] In addition to the PDCCH order, the information transmitted in step 701 can also be transmitted through other lower layer or high layer information, such as DCI, MAC CE, RRC signaling, etc.

[0341] Step 702: the fifth node transmits a preamble to a sixth node according to the information in step 701.

[0342] Step 703: the sixth node transmits a fifth notification message to the fifth node, wherein the function of this message is to transmit the TA value generated by the target base station to the source base station. The message includes third information related to the timing advance (TA), and the information includes at least one of the following information or information list:

[0343] * information identifying a candidate cell, such as a global cell identifier, a NR (New Radio) cell identifier, a NR CGI (NR Cell Global Identifier), PCI (Physical Cell Identifier), etc.

[0344] * information identifying the UE, such as C-RNTI (Cell Radio Network Temporary Identifier), I-RNTI (Idle Radio Network Temporary Identifier), RA-RNTI ( Random Access Radio Network Temporary Identifier), etc., the information can be an INTEGER value, such as INTEGER (0.. 65535,...).

[0345] * information indicating a type of resources used for early uplink synchronization. The function of this information is to indicate the type of resources used for early uplink synchronization corresponding to the current TA value, such as a type of a legacy random access or a random access through SBFD, or other random access types. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2,...). The type1 and type2 can be TDD uplink synchronization, SBFD uplink synchronization or other uplink synchronization resource types. This information may also be separate information indicating the SBFD random access type. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be juxtaposed with the candidate cell ID as optional information.

[0346] * information indicating a type of random access occasion used for early uplink synchronization. The function of this information is to indicate the type of the random access occasion used for early uplink synchronization corresponding to the current TA value, such as the legacy RO, the additional or newly added RO, or the flexible RO. The encoding method of this information can be ENUMERATED type, such as ENUMERATED (type1, type2, type3,...), wherein the type 1, type 2, and type 3 can be the legacy RO, additional RO, flexible RO or other types of RO. The legacy RO refers to TDD uplink random access occasion, the additional RO refers to SBFD random access occasion, and the flexible RO refers to RO corresponding to flexible symbols / resources (which can be used for both uplink and downlink).This information may also be separate information indicating additional RO of the SBFD, which is used to indicate that the random access occasion allocated by the DU is a newly added RO defined for the SBFD. In this case, the encoding method of this information is ENUMERATED (true,...). This information can be juxtaposed with the candidate cell ID as optional information.

[0347] * a new or additional preamble index. This information is used to indicate the preamble index used by the UE in addition to the existing preambles, such as a new index for SBFD random access. The information can be an INTEGER value starting at 64, such as INTEGER (64.. 127,...), and the maximum value of the INTEGER value can be any INTEGER not less than 64.

[0348] If the above information is included in the fifth notification message, the fifth node should use this information to trigger LTM cell switch.

[0349] The above-mentioned fifth notification message may be a TA information transfer message, or a NG-RAN Node Configuration Update message, or other existing or newly defined Xn interface messages. The message can be a UE-associated message or a non-UE-associated message.

[0350] Step 704: the fifth node transmits a second command message to the fourth node, the function of which is to transmit the TA value of the candidate cell measured by the target base station to the source base station, and trigger the UE to perform cell switch. This message can be the MAC CE used to transmit the cell switch instruction in the LTM process, or it can be other lower layer or high layer signaling, such as DCI, RRC signaling, etc.

[0351] The above-mentioned embodiment provides a process design related to resource allocation for early uplink synchronization. In the methods provided by various embodiments of the present disclosure, the CU or base station currently serving the UE can request resources for early uplink synchronization for SBFD for UEs with SBFD uplink synchronization capabilities (such as supporting SBFD mode recognition / awareness, supporting SBFD random access, etc.), so that the candidate cell can reserve resources for early uplink synchronization for SBFD, and can also reserve or allocate legacy resources for legacy UEs, thereby improving resource utilization, improving system throughput, and allocating and utilizing resources more reasonably.

[0352] Please refer to Figure 8, Figure 8 is a sixth flow schematic diagram according to various embodiments of the present disclosure.

[0353] Taking Inter-gNB-DU LTM as an example, the present disclosure provides a complete implementation of early uplink synchronization of SBFD. As shown in Figure 8, this embodiment may include one or more of the following steps.

[0354] Step 1: a fourth node collects and reports layer 3 measurement control and reports to a network.

[0355] Step 2: a first node decides to initialize an LTM configuration.

[0356] Step 3: the first node transmits a UE context setup request message to a third node. The function of this message is to request resources for early uplink synchronization from the third node. For the specific content of this step, refer to step 301.

[0357] Step 4: the third node transmits a UE context setup response message to the first node. The function of this message is to feed back information on resources for early uplink synchronization. For specific content, refer to step 302.

[0358] Step 5: the first node transmits a UE context modification request message to the second node. The function of this message is to transmit information related to the random access configuration of the accepted candidate cell to the second node. For the specific content of this message, refer to step 303.

[0359] Step 6: a second node transmits a UE context modification response message to the first node. For the specific content of this message, refer to step 304.

[0360] Step 7 (optional): the first node transmits a UE context modification request message to the third node.

[0361] Step 8 (optional): the third node transmits a UE context modification response message to the first node.

[0362] Step 9: the first node transmits a downlink RRC message transfer message to the second node. The function of this message is to transmit the RRC message containing the LTM configuration generated by the first node to the second node. For the specific content of this message, refer to step 401.

[0363] Step 10: the second node transmits an RRC reconfiguration message to the fourth node. The contents of this message refer to step 402.

[0364] Step 11: the fourth node transmits an RRC reconfiguration complete message to the second node. The content of this message refers to step 403.

[0365] Step 12: the second node transmits an uplink RRC message transfer message to the first node.

[0366] Step 13: the second node transmits early TA acquisition information to the fourth node, which contains information related to resources used by the UE for early uplink synchronization, and its function is to trigger the UE to transmit a preamble to the candidate cell to perform early uplink synchronization.

[0367] The contents of this information refer to step 501. The fourth node transmits the preamble to the third node, step 502.

[0368] Step 14: the third node transmits a DU-CU TA information transfer message to the first node. Information related to the timing advance (TA) value of the candidate cell is transmitted to the CU. The content of this message refers to step 503.

[0369] Step 15: the first node transmits a CU-DU TA information transfer message to the second node. The function of this message is to transmit information related to the TA value of the candidate cell to the source DU. The contents of the message refer to step 504.

[0370] Step 16: the fourth node transmits a layer-1 measurement report to the second node.

[0371] Step 17: the second node makes an LTM cell switch decision.

[0372] Step 18: the second node transmits a cell switch command to the fourth node. The second node transmits a first command message to the fourth node, the function of which is to transmit the TA value of the target cell to the fourth node. The contents of this message refer to step 505.

[0373] Step 19: the second node transmits a DU-CU cell switch notification message to the first node.

[0374] Step 20: the first node transmits a CU-DU cell switch notification message to the third node.

[0375] The messages in step 21 and subsequent steps will not be described again.

[0376] The above-mentioned embodiment provides a process design related to resource allocation for early uplink synchronization. In the methods provided by various embodiments of the present disclosure, the CU or base station currently serving the UE can request resources for early uplink synchronization for SBFD for UEs with SBFD uplink synchronization capabilities (such as supporting SBFD mode recognition / awareness, supporting SBFD random access, etc.), so that the candidate cell can reserve resources for early uplink synchronization for SBFD, and can also reserve or allocate legacy resources for legacy UEs, thereby improving resource utilization, improving system throughput, and allocating and utilizing resources more reasonably. Specifically, the CU or base station currently serving the UE can notify the UE at an appropriate time to perform early uplink synchronization on the resources reserved by the target base station, obtain TA in advance, and synchronize to the target base station faster.

[0377] Fig. 9 is a block diagram illustrating the structure of a first node 800 according to an embodiment of the present disclosure.

[0378] Referring to Fig. 9, the first node 800 includes a transceiver 801 and a controller 802. The transceiver 801 is configured to transmit and receive signals to and from the outside. The controller 802 is configured to perform the method performed by the first node described above. The first node 800 may be implemented in the form of hardware, software, or a combination of hardware and software, so that it can perform the method described by the first node in this disclosure.

[0379] Figure 10 is a block diagram illustrating the structure of a second node 900 according to an embodiment of the present disclosure.

[0380] Referring to Figure 10, the second node 900 includes a transceiver 901 and a controller 902. The transceiver 901 is configured to transmit and receive signals to and from the outside. The controller 902 is configured to perform the method performed by the second node described above. The second node 900 may be implemented in the form of hardware, software, or a combination of hardware and software, so that it can perform the method described by the second node in this disclosure.

[0381] Figure 11 is a block diagram illustrating the structure of a third node 1000 according to an embodiment of the present disclosure.

[0382] Referring to Figure 11, the third node 1000 includes a transceiver 1001 and a controller 1002. The transceiver 1001 is configured to transmit and receive signals to and from the outside. The controller 1002 is configured to perform the method performed by the third node described above. The third node 1000 may be implemented in the form of hardware, software, or a combination of hardware and software, so that it can perform the method described by the third node in this disclosure.

[0383] Fig. 12 is a block diagram illustrating the structure of a user equipment 1100 according to an embodiment of the present disclosure.

[0384] Referring to Fig. 12, a user equipment 1100 includes a transceiver 1101 and a controller 1102. The transceiver 1101 is configured to transmit and receive signals to and from the outside. The controller 1102 is configured to perform the method performed by the user equipment described above. The user equipment 1100 may be implemented in the form of hardware, software, or a combination of hardware and software, so as to enable it to perform the method performed by the user equipment described in the present disclosure.

[0385] Those skilled in the art will understand that the illustrative embodiments described above are described herein and are not intended to be limiting. It should be understood that any two or more of the embodiments disclosed herein can be combined in any combination. In addition, other embodiments can be utilized and other changes can be made without departing from the spirit and scope of the subject matter presented herein. It will be readily understood that aspects of the present invention of the present disclosure, as generally described herein and shown in the accompanying drawings, can be arranged, substituted, combined, separated and designed in various different configurations, all of which are contemplated herein.

[0386] Those skilled in the art will understand that the various illustrative logical blocks, modules, circuits, and steps described in the present application can be implemented as hardware, software, or a combination of both. In order to clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above in the form of their function set. Whether such a function set is implemented as hardware or software depends on the specific application and the design constraints imposed on the total / overall system. Skilled people can implement the described function set in different ways for each specific application, but such design decisions should not be interpreted as causing a departure from the scope of the present application.

[0387] The various illustrative logic blocks, modules, and circuits described in the present application can be implemented in a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0388] The steps of the method or technique described in the present application can be embodied directly in hardware, in a software module performed by a processor, or in a combination of both. Software modules may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, register, hard disk, removable disk, or any other form of storage media known in the art. An exemplary storage medium is coupled to a processor to enable the processor to read and write information from / to the storage medium. In the alternative, the storage medium may be integrated into the processor. The processor and storage medium may reside in an ASIC. The ASIC may reside in the UE. In the alternative, the processor and the storage medium may reside in the UE as discrete components.

[0389] In one or more exemplary designs, the described functions can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, each function can be stored on or transferred by a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, which includes any media that facilitates the transfer of computer programs from one place to another. The storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0390] What has been described above is only an exemplary embodiment of the present disclosure, and is not used to limit the protection scope of the present disclosure, which is determined by the appended claims.

Claims

1.A method performed by a first node in a wireless communication system, the method comprising:transmitting a first request message to a third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of a requested random access occasion (RO);receiving a first response message from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources;receiving a third notification message from the third node, wherein the third notification message includes first information related to a timing advance (TA); andtransmitting a fourth notification message to a second node, wherein the fourth notification message includes second information related to a timing advance (TA),wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA,wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).2.The method of claim 1, wherein the first response message further includes at least one of:sixth information relating to a type of allocated resources for early uplink synchronization,seventh information related to a type of an allocated random access occasion (RO),third configuration information related to an allocated SBFD Contention Free Random Access (CFRA).3.The method of claim 1, wherein the first information or second information includes at least one of:eighth information related to a type of resources for early uplink synchronization corresponding to a current TA value,ninth information related to a type of random access occasion (RO) for early uplink synchronization corresponding to the current TA value,a preamble index for a random access related to the SBFD,first user information, which includes information related to UE that performs a random access through the SBFD.4.The method of claim 1, further comprising:transmitting a second request message to the second node, wherein the second request message includes tenth information related to configuration of early synchronization of a candidate cell; andreceiving a second response message from the second node, wherein the second response message includes response information to the tenth information,wherein the tenth or thirteenth information includes at least one of:fourth configuration information associated with an allocated early synchronization related to the SBFD,fourteenth information relating to a type of allocated resources for early uplink synchronization,fifteenth information related to a type of an allocated random access occasion (RO),fifth configuration information related to an allocated SBFD Contention Free Random Access (CFRA).5.The method of claim 1, further comprising:receiving a third request message from a fifth node, wherein the third request message includes eleventh information related to a type of requested resources for early uplink synchronization or twelfth information related to a type of a requested random access occasion (RO); andtransmitting a third response message to the fifth node, wherein the third response message includes thirteenth information related to a configuration of early synchronization of a candidate cell.6.The method of claim 1, wherein at least one of the following is indicated by ENUMERATED types: the fourth information, the fifth information, the sixth information, the seventh information, the eighth information, the ninth information, the eleventh information, the twelfth information, the fourteenth information, the fifteenth information,wherein the ENUMERATED types include at least one of:ENUMERATED (a first type, a second type, both the first type and the second type),ENUMERATED (the second type, only the second type),ENUMERATED (the first type, the second type),ENUMERATED (the first type, the second type, a third type),ENUMERATED (true),wherein the first type includes the first type of resources or the first type of RO, the second type includes the second type of resources or the second type of RO, and the third type includes a third type of RO,wherein the first type of RO includes an RO related an uplink slot of the TDD,wherein the second type of RO includes an RO related to an SBFD uplink sub-band, andwherein the third type of RO includes an RO corresponding to resources for both uplink and downlink.7.The method of claim 1, wherein the second configuration information, the third configuration information, the fourth configuration information, or the fifth configuration information includes at least one of:a subcarrier spacing of the SBFD,a starting frequency or starting frequency band of the SBFD,a number of random access occasions of a random access channel (RACH) of the SBFD,an index of a random access configuration of the RACH of the SBFD,a number of synchronization signal blocks (SSBs) of each random access occasion of SBFD,a frequency domain length of a random access occasion of the SBFD,zero correlation zone configuration for a random access of the SBFD,a random access response window of the SBFD.8.The method of claim 1, wherein at least one of the fourth information, the fifth information, the eleventh information, or the twelfth information is indicated by first capability information including information related to whether a User Equipment (UE) supports the SBFD.9.A method performed by a second node in a wireless communication system, the method comprising:receiving a fourth notification message from a first node, wherein the fourth notification message includes second information related to a timing advance (TA); andtransmitting a first command message to a User Equipment (UE), wherein the first command message includes twentieth information related to the TA,wherein the fourth notification message is based on a third notification message received by the first node from a third node, wherein the third notification message includes first information related to a Timing advance (TA),wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources,wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of requested random access occasion (RO),wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA,wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).10.The method of claim 9, further comprising:receiving a downlink radio resource control (RRC) message delivery message from the first node, wherein the RRC message transfer message includes at least one of: sixth configuration information related to Sub-band Full Duplex (SBFD) Contention Free Random Access (CFRA), sixteenth information associated with early uplink synchronization related to the SBFD;transmitting an RRC reconfiguration message to the user equipment (UE), wherein the RRC reconfiguration message includes at least one of the sixth configuration information or the sixteenth information; andreceiving an RRC reconfiguration complete message from the UE.11.The method of claim 9, further comprising:transmitting seventeenth information for timing advance (TA) acquisition to the UE.12.The method of claim 10, wherein the sixteenth information, or the seventeenth information, comprises at least one of:seventh configuration information associated with allocated resources for early uplink synchronization related to the SBFD,eighteenth information related to a type of allocated resources for early uplink synchronization,nineteenth information related to a type of an allocated random access occasion (RO).13.The method of claim 10, wherein the RRC reconfiguration message further includes at least one of:seventh configuration information, which includes information associated with resources for early uplink synchronization of time division duplex (TDD),eighth configuration information, which includes information associated with UE-specific TDD random access resources.14.A first node in a wireless communication system, the first node comprising:at least one transceiver;at least one processor communicatively coupled to the at least one transceiver; andat least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the first node to:transmit a first request message to a third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of a requested random access occasion (RO),receive a first response message from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources,receive a third notification message from the third node, wherein the third notification message includes first information related to a timing advance (TA),transmit a fourth notification message to a second node, wherein the fourth notification message includes second information related to a timing advance (TA),wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA,wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).15.A second node in a wireless communication system, the second node comprising:at least one transceiver;at least one processor communicatively coupled to the at least one transceiver; andat least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the second node to:receive a fourth notification message from a first node, wherein the fourth notification message includes second information related to a timing advance (TA),transmit a first command message to a User Equipment (UE), wherein the first command message includes twentieth information related to the TA,wherein the fourth notification message is based on a third notification message received by the first node from a third node, wherein the third notification message includes first information related to a Timing advance (TA),wherein the third notification message is based on a first response message received by the first node from the third node, wherein the first response message includes first configuration information related to a first type of resources or second configuration information related to a second type of resources,wherein the first response message is based on a first request message transmitted by the first node to the third node, wherein the first request message includes fourth information related to a type of requested resources for early uplink synchronization or fifth information related to a type of requested random access occasion (RO),wherein the first information or the second information are used to determine a type of resources for early uplink synchronization associated with the TA,wherein the first type of resources includes resources for early uplink synchronization related to uplink slots of Time Division Duplex (TDD), and the second type of resources includes resources for early uplink synchronization related to Sub-band Full Duplex (SBFD).

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