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EP-4740675-A1 - METHOD PERFORMED BY USER EQUIPMENT, METHOD PERFORMED BY BASE STATION, USER EQUIPMENT AND BASE STATION

EP4740675A1EP 4740675 A1EP4740675 A1EP 4740675A1EP-4740675-A1

Abstract

The invention provides a method performed by a user equipment, a method performed by a base station, the user equipment and the base station. The method comprises the following steps: receiving configuration information, wherein the configuration information comprises W values of the number of random access occasions ROs N corresponding to a random access attempt and a random access configuration index; determining information related to at least one RO group corresponding to the number of ROs N based on the configuration information, wherein each RO group comprises N ROs; wherein, the information related to the at least one RO group includes the resource location of the RO group and/or the number of RO groups, the first RO group in the at least one RO group includes N adjacent ROs start from the first RO, and other RO groups include N adjacent ROs after the first RO group respectively; or the information related to the at least one RO group includes the resource locations of Y RO groups in every second time period; determining preamble(s) corresponding to the number of ROs N; performing a random access attempt based on the information related to the at least one RO group and the preamble(s).

Inventors

  • XIONG, Qi
  • SUN, Feifei

Assignees

  • Samsung Electronics Co., Ltd.

Dates

Publication Date
20260513
Application Date
20240808

Claims (15)

  1. A method performed by user equipment (UE) in a communication system, comprising: receiving configuration information, wherein the configuration information comprises W values of the number N of random access occasions ROs corresponding to a random access attempt and a random access configuration index; determining information related to at least one RO group corresponding to the number of ROs N based on the configuration information, each RO group comprises N ROs; wherein, the information related to at least one RO group includes resource location of the RO groups and/or the number of RO groups, the first RO group among the at least one RO group includes N adjacent ROs start from the first RO, and the other RO groups respectively include N adjacent ROs after the first RO group; or the information related to the at least one RO group includes resource locations of Y RO groups in every second time period; determining preamble(s) corresponding to the number of ROs N; performing a random access attempt based on the information related to at least one RO group and the preamble(s), where N, W and Y are positive integers.
  2. The method according to claim 1, wherein the first RO corresponds to the first RO index configured or the first RO after a reference time point, the reference time point includes start time point of SFN0 or a third time period, and the third period includes at least one of: one or more time units, a mapping cycle from SSB or CSI-RS to RO, an association period, and an association pattern period.
  3. The method according to claim 1, wherein a gap between two adjacent RO groups in the at least one RO group is X time units, where X is a positive integer.
  4. The method according to claim 1, wherein the second time period comprises X1 time units, and X1 is a positive integer, and if the number of RO groups included in the second time period is greater than Y, the Y RO groups are the first Y RO groups of the RO groups included in the second time period, the last Y RO groups of the RO groups included in the second time period, or the Y RO groups determined at a gap of X2 time units in the second time period, where X2 is a positive integer.
  5. The method according to claim 1, wherein the configuration information further comprises an RO group mask index, and the information related to at least one RO group comprises resource locations of the at least one RO group determined based on the RO group mask index.
  6. The method according to claim 5, wherein the RO group mask index is an RO mask index.
  7. The method according to claim 5, wherein the RO group mask index indicates at least one RO group index, the at least one RO group index is a logical index in a third time period, and the third period includes at least one of: one or more time units, a mapping cycle from a synchronization signal physical broadcast channel block (SSB) or a channel state information reference signal (CSI-RS) to RO, an association period, and an association pattern period, and wherein the RO group mask index indicates odd-numbered RO groups, even-numbered RO groups, an RO group in every X4 RO groups, the first X5 RO groups, the last X6 RO groups, all RO groups, where X4, X5 and X6 are the same or different positive integers.
  8. The method according to claim 1, wherein the information related to at least one RO group further comprises a first time period in which the patterns of the RO groups are repeated or the same, the method further comprises: determining W time periods of patterns of RO groups respectively corresponding to each of W values of the number of ROs N, and determining the first time period based on the W time periods of the patterns of the RO groups; or determining the first time period based on a first value related to W values of the number of ROs N.
  9. The method according to claim 8, wherein the first time period comprises at least one of: least common multiple of the W time periods; minimum value of power of 2 not less than least common multiple of the W time periods; maximum value of the W time periods; minimum value of power of 2 not less than the maximum value of the W time periods.
  10. The method according to claim 8, wherein the first value comprises at least one of: least common multiple of the W values; minimum value of power of 2 not less than least common multiple of the W values; maximum value of the W values; minimum value of power of 2 not less than the maximum value of the W values.
  11. The method according to claim 1, wherein each RO group corresponds to the same preambles, and determining the preamble(s) corresponding to the number of ROs N comprises: determining the preambles based on configured information about preambles; and/or respectively dividing multiple preambles related to RO into W preamble groups corresponding to W values of the number of ROs N, and determining the preambles corresponding to the number of ROs N from the preamble groups corresponding to the number of ROs N.
  12. The method according to claim 11, wherein the respectively dividing multiple preambles related to RO into W preamble groups respectively corresponding to W values of the number of ROs N comprises: dividing multiple preambles related to RO into W preamble groups according to the preamble index order; or dividing multiple preambles related to RO into W preamble groups at equal intervals according to preamble indexes.
  13. A method performed by a base station in a communication system, comprising: sending configuration information, wherein the configuration information comprises W values of the number of random access occasions ROs N corresponding to a random access attempt and a random access configuration index; receiving a random access channel, wherein the random access channel is transmitted based on information related to at least one RO group corresponding to the number of ROs N and preamble(s) corresponding to the number of ROs N, each RO group including N ROs, wherein information related to the at least one RO group is determined based on the configuration information, wherein, the information related to the at least one RO group includes resource location of the RO group and/or the number of RO groups, the first RO group in the at least one RO group includes N adjacent ROs start from the first RO, and the other RO groups respectively include N adjacent ROs after the first RO group; or the information related to the at least one RO group includes resource location of Y RO groups in every second time period, where N, W and Y are positive integers.
  14. A user equipment (UE), comprising: a transceiver configured to transmit and/or receive signals; a controller configured to control the UE to execute the method according to any one of claims 1 to 12.
  15. A base station, comprising: a transceiver configured to transmit and/or receive signals; a controller configured to control the base station to perform the method according to claim 13.

Description

METHOD PERFORMED BY USER EQUIPMENT, METHOD PERFORMED BY BASE STATION, USER EQUIPMENT AND BASE STATION The present invention relates to communication, and more particularly, to a method performed by user equipment, a method performed by a base station, user equipment and a base station. Fifth generation (5G) mobile communication technologies define broad frequency bands to enable high transmission rates and new services, and can be implemented not only in "Sub 6GHz" bands, such as 3.5GHz, but also in "Above 6GHz" bands referred to as millimeter wave (mmWave) including 28GHz and 39GHz. In addition, it has been considered to implement sixth generation (6G) mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (e.g., 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. In the initial stage 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 multiple-input multiple-output (MIMO) for alleviating radio-wave path loss and increasing radio-wave transmission distances in mmWave, numerology (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 bandwidth part (BWP), new channel coding methods, such as a low density parity check (LDPC) code for large-capacity data transmission and a polar code for highly reliable transmission of control information, layer 2 (L2) pre-processing, and network slicing for providing a dedicated network customized to a specific service. 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 vehicle-to-everything (V2X) 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, new radio unlicensed (NR-U) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, new radio (NR) user equipment (UE) power saving, non-terrestrial network (NTN) which is UE-satellite direct communication for securing coverage in an area in which communication with terrestrial networks is unavailable, and positioning. Moreover, there has been ongoing standardization in wireless interface architecture/protocol fields regarding technologies, such as industrial Internet of things (IIoT) for supporting new services through interworking and convergence with other industries, integrated access and backhaul (IAB) 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 dual active protocol stack (DAPS) handover, and two-step random access for simplifying random access procedures (2-step random access channel (RACH) for NR). There also has been ongoing standardization in system architecture/service fields 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. If such 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 augmented reality (AR), virtual reality (VR), mixed reality (MR), or 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. Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for securing coverage in terahertz bands of 6G mobile communication technologies, full dimensional MIMO (FD-MIMO), multi-antenna transmission technologies, such as array antennas and large-scale antennas, metamaterial-based lenses