Communication method, user equipment and base station

Abstract

The embodiment of the invention provides a communication method, user equipment and a base station. The method comprises the following steps: sending a lead code; a random access response is received in a first downlink frequency domain resource group, the random access response comprises uplink authorization, and the first downlink frequency domain resource group comprises downlink frequency domain resources used for transmitting system information and / or synchronization signals; receiving a second reference signal in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group comprises downlink frequency domain resources except the first downlink frequency domain resource group; sending a PUSCH (Physical Uplink Shared Channel), the PUSCH being scheduled by the uplink grant, and the PUSCH comprising a CSI (Channel State Information) report related to the second reference signal; and receiving the third PDSCH on the second downlink frequency domain resource group. According to the embodiment of the invention, the downlink spectrum efficiency can be improved. The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond 4G communication systems such as Long Term Evolution (LTE).

Description

Technical Field

[0001] This disclosure relates to the field of wireless communication technology, and more specifically, to a communication method, user equipment (UE), and base station. Background Technology

[0002] Given the successive generations of wireless communication development, these technologies have primarily been developed for human-oriented services such as voice calls, multimedia services, and data services. With the commercialization of 5th-generation (5G) communication systems, the number of connected devices is expected to grow exponentially. These will increasingly connect to communication networks. Examples of the Internet of Things (IoT) can include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to evolve in various forms, such as augmented reality glasses, virtual reality headsets, and holographic devices. Efforts are underway to develop improved 6G communication systems to provide a wide range of services by connecting hundreds of billions of devices and things in the 6th-generation (6G) era.

[0003] The 6G communication system, expected to be commercially available around 2030, will offer significant improvements in all aspects compared to existing 5G systems. Its peak speed will reach at least 50 Gbit / s, user experience speed will reach at least 300 Mbit / s, air interface latency will be less than 1 ms, and air interface reliability will reach 10^(-5). In addition to these fundamental communication indicators, the 6G communication system will also possess sensing capabilities, AI-related capabilities, and better security, interoperability, and sustainability.

[0004] To achieve the aforementioned performance indicators for 6G communication systems, more advanced air interface and network technologies are needed. Currently, the evolution of extreme multiple input multiple output (MIMO) is being considered, including the use of very large-scale antenna arrays, the development and evolution of distributed antenna systems, and the design of MIMO air interface algorithms assisted by artificial intelligence (AI). This technology can achieve higher spectral efficiency, greater coverage, and more precise positioning and sensing capabilities. Furthermore, technologies that contribute to improving high-frequency coverage, including metamaterial-based lenses and antennas, novel antenna architectures, and reconfigurable intelligence surfaces (RIS), also require further evolution and development.

[0005] To meet the new functionalities added to 6G communication systems, it is necessary to develop new technologies in areas such as network energy saving, air interface security, and network security, while also studying the feasibility of converged technologies such as integrated communication and sensing.

[0006] In addition, to improve spectrum efficiency and overall network performance, the following technologies have been developed for 6G communication systems: full-duplex technology to enable uplink and downlink transmissions to use the same frequency resources simultaneously; network technologies that utilize satellites, high-altitude platform stations (HAPS), etc., in a comprehensive manner; improved network architecture to support mobile base stations, etc., and to enable network operation optimization and automation; dynamic spectrum sharing technology based on spectrum usage prediction and conflict avoidance; the use of artificial intelligence (AI) in wireless communication to improve overall network operation by utilizing AI from the design phase of 6G development and internalizing end-to-end AI support functions; and next-generation distributed computing technologies that overcome the computing power limitations of user equipment (UE) by leveraging ultra-high-performance communication and computing resources (such as mobile edge computing (MEC), cloud, etc.) achievable on the network. Furthermore, efforts are continuing to enhance connectivity between devices, optimize networks, promote the software-defined networking of network entities, and increase the openness of wireless communications by designing new protocols to be used in 6G communication systems, developing mechanisms for achieving hardware-based secure environments and secure data use, and developing technologies for maintaining privacy.

[0007] The research and development of 6G communication systems, encompassing both person-to-machine (P2M) and machine-to-machine (M2M) hyper-connectivity, is expected to deliver the next wave of hyper-connected experiences. Optionally, services such as truly immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas are anticipated to be provided via 6G communication systems. Furthermore, services such as remote surgery for enhanced safety and reliability, industrial automation, and emergency response will be offered through 6G communication systems, enabling the technology to be applied across a wide range of sectors including industry, healthcare, automotive, and home appliances. Summary of the Invention

[0008] The purpose of this disclosure is to address the problem of how to improve downlink spectrum efficiency.

[0009] According to one aspect of the present disclosure, a method performed by a user equipment in a communication system is provided, the method comprising:

[0010] Send the preamble;

[0011] A random access response is received in the first downlink frequency domain resource group, which includes an uplink grant. The first downlink frequency domain resource group includes downlink frequency domain resources for transmitting system information and / or synchronization signals.

[0012] A second reference signal is received in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group;

[0013] Transmit the Physical Uplink Shared Channel (PUSCH), which is scheduled by uplink grant and includes a Channel State Information (CSI) report related to the second reference signal.

[0014] On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is received.

[0015] Optionally, receiving the PDSCH includes:

[0016] Listen to the third PDCCH, which includes indication information related to the modulation and coding strategy (MCS). The MCS-related indication information is used to indicate one of the multiple MCS tables.

[0017] The third PDSCH is received, and the MCS of the third PDSCH is determined based on the third PDCCH and channel state information.

[0018] Optionally, a third PDSCH may be received on the first downlink frequency domain resource group and the second downlink frequency domain resource group.

[0019] Optionally, the method further includes:

[0020] Receive second configuration information related to a reference signal and indication information related to the second reference signal, wherein the indication information related to the second reference signal is used to indicate that at least one set of configurations in the second configuration information is activated;

[0021] The indication information related to the second reference signal includes at least one of the following:

[0022] Wake-up signal;

[0023] The first PDSCH includes paging-related information.

[0024] Optionally, the method further includes:

[0025] Receive third configuration information related to the CSI report, and first indication information related to the CSI report, wherein the first indication information is used to indicate that at least one set of configurations in the third configuration information is activated;

[0026] The first instruction information includes at least one of the following:

[0027] Wake-up signal;

[0028] The first physical downlink control channel (PDCCH) includes paging-related information.

[0029] The first PDSCH includes paging-related information.

[0030] The activation command in the second PDSCH, which includes a random access response;

[0031] The first downlink control information (DCI) of the second PDSCH is scheduled;

[0032] The MAC subheader of the second PDSCH;

[0033] Random access response;

[0034] Upward authorization.

[0035] Optionally, the method further includes:

[0036] Receive second indication information related to the CSI report, the second indication information being used to indicate whether to send the CSI report;

[0037] The first instruction information includes at least one of the following:

[0038] Third-party configuration information related to CSI reports;

[0039] Wake-up signal;

[0040] The first PDCCH includes paging-related information;

[0041] The first PDSCH includes paging-related information.

[0042] The activation command in the second PDSCH, which includes a random access response;

[0043] Schedule the first DCI of the second PDSCH;

[0044] Random access response.

[0045] Optionally, the activation command is included in the random access response; and / or,

[0046] The activation command includes a first Media Access Control Protocol Data Unit (MAC PDU), which includes at least one of the following:

[0047] Signage for the service area;

[0048] Identifier for downlink frequency domain resource groups;

[0049] CSI resource identifiers;

[0050] CSI resource group identifier;

[0051] The Transmission Configuration Indicator (TCI) status identifier.

[0052] Optionally, at least one row in the Time Domain Resource Allocation (TDRA) table includes first indication information, and the first DCI includes a field for indicating at least one row in the TDRA table.

[0053] Optionally, the first indication information includes a K-bit bitmap, where each bit in the bitmap is associated with a reference signal resource of K time-domain resource units;

[0054] Among them, the reference starting time domain resource unit corresponding to the K time domain resource units is the time domain resource unit where the downlink signal carrying the bitmap is located, or the reference starting time domain resource unit is the time domain resource unit where the lowest index SSB in the current SSB period is located;

[0055] The value of K is determined based on the DCI format provided by the second PDCCH.

[0056] Optionally, the DCI format provided by the second PDCCH includes the activation duration of the reference signal resource set.

[0057] Optionally, a CSI report is triggered if a first condition is met, wherein the first condition includes at least one of the following:

[0058] The measurement results of the second downlink frequency domain resource group meet the first threshold requirement;

[0059] The difference or absolute value of the measurement results of the first downlink frequency domain resource group and the measurement results of the second downlink frequency domain resource group meet the second threshold requirement;

[0060] The minimum operating bandwidth supported by the UE is greater than or equal to the bandwidth of the first downlink frequency domain resource group;

[0061] The minimum operating bandwidth supported by the UE is greater than or equal to the first frequency difference, which is the frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group.

[0062] The minimum operating bandwidth supported by the UE is greater than or equal to the second frequency difference, which is the frequency difference between the highest frequency frequency resource element of the first downlink frequency domain resource group and the lowest frequency frequency resource element of the second downlink frequency domain resource group.

[0063] Optionally, the method further includes:

[0064] Based on the second PDCCH or second PDSCH of the scheduling random access response, the time-domain resource location and / or frequency-domain resource location of the second reference signal are determined, wherein the second PDSCH includes the random access response.

[0065] Optionally, the time-domain resource location of the second reference signal is determined based on at least one of the following:

[0066] Temporal resources used for the second PDCCH;

[0067] The first offset is the offset between the time-domain resources occupied by the second reference signal and the time-domain resources used for the second PDCCH.

[0068] Time-domain resources used for the second PDSCH;

[0069] The second offset is the offset between the time-domain resources occupied by the second reference signal and the time-domain resources used for the second PDSCH.

[0070] Optionally, the PUSCH includes Msg3 in the four-step random access process, the RRC message in Msg3 includes a CSI report, and / or, the second MAC CE or MAC sub-header of Msg3 includes a CSI report, and / or, the CSI report is multiplexed with uplink data on the PUSCH.

[0071] Optionally, the second MAC CE or MAC subheader includes at least one of the following information:

[0072] Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), Frequency Domain Resource Group Number, Bandwidth Part (BWP) Number, CSI Resource Index Number, CSI Reporting Index Number, CSI Type, and MAC CE Length.

[0073] The length of the MAC CE is related to the CSI type.

[0074] Optionally, the time-domain resources of PUSCH are determined based on a third offset and a first value. The third offset is the offset between the time-domain resource unit where the uplink grant is located and the time-domain resource unit where PUSCH is located, and the first value is related to the CSI report.

[0075] Optionally, the temporal resources of PUSCH are determined based on the sum of a third offset and a first value.

[0076] Optionally, the CSI report includes at least one of the following information:

[0077] CSI measurement results for at least one second downlink frequency domain resource group;

[0078] The minimum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0079] The maximum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0080] The index of the downlink frequency domain resource group whose CSI measurement result is greater than or equal to the first threshold;

[0081] The difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0082] The absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0083] The grade of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0084] The rank of the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0085] The UE's ability to measure the second downlink frequency domain resource group;

[0086] The relationship between the CSI measurement results of at least one downlink frequency domain resource group and the second threshold;

[0087] The relationship between the antenna ports of the first downlink frequency domain resource group and the antenna ports of the second downlink frequency domain resource group;

[0088] Quasi-co-addressable QCL relationship between the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group.

[0089] Optionally, the second reference signal includes at least one of the following: primary synchronization signal, secondary synchronization signal, non-cell defined synchronization signal block (NCD-SSB), tracking reference signal (TRS), channel state information reference signal (CSI-RS), and demodulation reference signal (DMRS).

[0090] Optionally, the second reference signal may include at least one of the following:

[0091] Information related to the first reference signal of the first downlink frequency domain resource group;

[0092] Reference signal type.

[0093] Optionally, the preamble is associated with whether the UE is configured to report CSI, and / or the preamble is associated with at least one set of CSI reports, and / or the preamble is associated with a second reference signal.

[0094] Optionally, a preamble may be sent, including:

[0095] If the UE is configured to report CSI, the UE selects a first preamble group and sends a preamble based on the first preamble group; the first preamble group is associated with whether the UE is configured to report CSI, and / or the first preamble group is associated with at least one set of CSI reports, and / or the first preamble group is associated with a second reference signal.

[0096] or,

[0097] If the UE is not configured to report CSI, the UE selects the second preamble group and sends the preamble based on the second preamble group.

[0098] Optionally, if the UE is configured to report CSI, a preamble is sent, including:

[0099] If the first condition is met, select the first preamble group and send the preamble based on the first preamble group;

[0100] If the first condition is not met, select the second preamble group and send the preamble based on the second preamble group.

[0101] Optionally, the first condition includes at least one of the following:

[0102] The potential Msg3 size is greater than the third threshold, and the Msg3 includes the CSI report;

[0103] The sum of the Common Control Channel (CCCH) Service Data Unit (SDU) size and the MAC sub-header size is greater than the fourth threshold. The MAC sub-header includes the CSI report.

[0104] The sum of the CCCH SDU size, MAC sub-header size, and second MAC CE size is greater than the fifth threshold, and the second MAC CE includes the CSI report.

[0105] Optionally, if the UE is configured to send a CSI report during initial access, the second configuration information related to the reference signal configures one or more reference signal timings, including reference signal timings other than the initial downlink BWP; and / or,

[0106] If the UE is not configured to send a CSI report during the initial access process, or if the UE is not configured to include a CSI report in Msg3, or if the UE is not configured to send a CSI report on the PUSCH corresponding to Msg3, the UE will not receive a reference signal outside of the initial downlink BWP.

[0107] Optionally, the frequency domain location of the second reference information is determined based on at least one of the following:

[0108] The fourth offset is the offset between the physical resource block PRB index of the starting frequency domain position of the second reference information and the lowest index resource block of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0109] The fifth offset is the offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the initial BWP or default BWP of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0110] The sixth offset is the offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the center frequency point of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0111] Optionally, the period of the second reference signal is determined based on at least one of the following:

[0112] Relationship with SSB cycle;

[0113] Relationship with discontinuous reception DRX period;

[0114] Relationship with paging cycle;

[0115] Relationship with upward and downward allocation cycles;

[0116] The relationship with the timing of random access transmission.

[0117] Optionally, for pre-authorized small data transfer procedures, sending PUSCH includes:

[0118] Send a CSI report on the first pre-authorized CG PUSCH.

[0119] Optionally, the configuration information related to the first downlink frequency domain resource group includes information related to the first bandwidth of the first downlink frequency domain resource group, as well as information related to available frequency domain resource units outside the first bandwidth.

[0120] Optionally, the information related to the available frequency domain resource units includes at least one of the following:

[0121] Frequency domain reference points for available frequency domain resource units;

[0122] The seventh offset is the offset of the lowest available frequency domain resource element from the frequency domain reference point.

[0123] The number of available frequency domain resource units.

[0124] Optionally, the frequency domain reference point includes at least one of the following:

[0125] The lowest frequency domain resource unit of the first downlink frequency domain resource group;

[0126] The highest frequency domain resource unit in the first downlink frequency domain resource group;

[0127] The next higher frequency frequency resource unit in the highest frequency domain resource unit of the first downlink frequency domain resource group;

[0128] Public reference point A.

[0129] Optionally, if the second PDSCH corresponding to the random access response includes indication information related to the transmission of SRS; and / or if the second PDSCH includes configuration information related to time-domain resources and / or frequency-domain resources for transmitting SRS, it further includes:

[0130] Send the Sound Reference Signal (SRS).

[0131] According to another aspect of the embodiments of this disclosure, a method performed by a user equipment in a communication system is provided, the method comprising:

[0132] A second reference signal is received in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group, and the first downlink frequency domain resource group includes downlink frequency domain resources for transmitting system information and / or synchronization signals;

[0133] The MsgA is sent during the two-step random access process. The PUSCH corresponding to MsgA includes a Channel State Information (CSI) report related to the second reference signal.

[0134] On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is received.

[0135] Optionally, receiving the PDSCH includes:

[0136] Listen to the third PDCCH, which includes indication information related to the modulation and coding strategy (MCS). The MCS-related indication information is used to indicate one of the multiple MCS tables.

[0137] The third PDSCH is received, and the MCS of the third PDSCH is determined based on the third PDCCH and channel state information.

[0138] The third PDSCH is received on the first downlink frequency domain resource group and the second downlink frequency domain resource group.

[0139] Optionally, the method further includes:

[0140] Receive MsgB during the two-step random access process, where MsgB includes a fallback random access response.

[0141] Resend MsgA; the corresponding PUSCH for MsgA includes the CSI report.

[0142] Optionally, the method further includes:

[0143] Receive second configuration information related to a reference signal and indication information related to the second reference signal, wherein the indication information related to the second reference signal is used to indicate that at least one set of configurations in the second configuration information is activated;

[0144] The indication information related to the second reference signal includes at least one of the following:

[0145] Wake-up signal;

[0146] The first physical downlink shared channel (PDSCH) includes paging-related information.

[0147] Optionally, the method further includes:

[0148] Receive third configuration information related to the CSI report, and first indication information related to the CSI report, wherein the first indication information is used to indicate that at least one set of configurations in the third configuration information is activated;

[0149] The first instruction information includes at least one of the following:

[0150] Wake-up signal;

[0151] The first physical downlink control channel (PDCCH) includes paging-related information.

[0152] The first PDSCH includes paging-related information.

[0153] Activation command;

[0154] First Downlink Control Information (DCI).

[0155] Optionally, the method further includes:

[0156] Receive second indication information related to the CSI report, the second indication information being used to indicate whether to send the CSI report;

[0157] The first instruction information includes at least one of the following:

[0158] Third-party configuration information related to CSI reports;

[0159] Wake-up signal;

[0160] The first PDCCH includes paging-related information;

[0161] The first PDSCH includes paging-related information.

[0162] Activation command;

[0163] First DCI.

[0164] Optionally, at least one row in the Time Domain Resource Allocation (TDRA) table includes first indication information, and the first DCI includes a field for indicating at least one row in the TDRA table.

[0165] Optionally, the first indication information includes a K-bit bitmap, where each bit in the bitmap is associated with a reference signal resource of K time-domain resource units;

[0166] Among them, the reference starting time domain resource unit corresponding to the K time domain resource units is the time domain resource unit where the downlink signal carrying the bitmap is located, or the reference starting time domain resource unit is the time domain resource unit where the lowest index SSB in the current SSB period is located;

[0167] The value of K is determined based on the DCI format provided by the second PDCCH.

[0168] Optionally, the DCI format provided by the second PDCCH includes the activation duration of the reference signal resource set.

[0169] Optionally, a CSI report is triggered if a first condition is met, wherein the first condition includes at least one of the following:

[0170] The measurement results of the second downlink frequency domain resource group meet the first threshold requirement;

[0171] The difference or absolute value of the measurement results of the first downlink frequency domain resource group and the measurement results of the second downlink frequency domain resource group meet the second threshold requirement;

[0172] The minimum operating bandwidth supported by the UE is greater than or equal to the first frequency difference, which is the frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group.

[0173] The minimum operating bandwidth supported by the UE is greater than or equal to the second frequency difference, which is the frequency difference between the highest frequency frequency resource element of the first downlink frequency domain resource group and the lowest frequency frequency resource element of the second downlink frequency domain resource group.

[0174] Optionally, the CSI report includes at least one of the following information:

[0175] CSI measurement results for at least one second downlink frequency domain resource group;

[0176] The minimum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0177] The maximum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0178] The index in the downlink frequency domain resource group where the CSI measurement result is greater than the first threshold;

[0179] The difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0180] The absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0181] The grade of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0182] The rank of the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0183] The UE's ability to measure the second downlink frequency domain resource group;

[0184] The relationship between the CSI measurement results of at least one downlink frequency domain resource group and the second threshold;

[0185] The relationship between the antenna ports of the first downlink frequency domain resource group and the antenna ports of the second downlink frequency domain resource group;

[0186] Quasi-co-addressable QCL relationship between the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group.

[0187] Optionally, the second reference signal includes at least one of the following: primary synchronization signal, secondary synchronization signal, non-cell defined synchronization signal block (NCD-SSB), tracking reference signal (TRS), channel state information reference signal (CSI-RS), and demodulation reference signal (DMRS).

[0188] Optionally, the second reference signal may include at least one of the following:

[0189] Information related to the first reference signal;

[0190] Reference signal type.

[0191] Optionally, the preamble in MsgA is associated with whether the UE is configured to report CSI, and / or, the preamble in MsgA is associated with at least one set of CSI reports, and / or, the preamble in MsgA is associated with a second reference signal.

[0192] Optionally, MsgA is sent, including:

[0193] If the UE is configured to report CSI, the UE selects a first preamble group and sends a preamble based on the first preamble group; the first preamble group is associated with whether the UE is configured to report CSI, and / or the first preamble group is associated with at least one set of CSI reports, and / or the first preamble group is associated with a second reference signal.

[0194] or,

[0195] If the UE is not configured to report CSI, the UE selects the second preamble group and sends MsgA based on the second preamble group.

[0196] Optionally, if the UE is configured to report CSI, send MsgA, including:

[0197] If the first condition is met, select the first preamble group and send MsgA based on the first preamble group;

[0198] If the first condition is not met, select the second preamble group and send MsgA based on the second preamble group.

[0199] Optionally, the first condition includes at least one of the following:

[0200] The sum of the Common Control Channel (CCCH) Service Data Unit (SDU) size and the MAC sub-header size is greater than the fourth threshold. The MAC sub-header includes the CSI report.

[0201] The sum of the CCCH SDU size, MAC sub-header size, and second MAC CE size is greater than the fifth threshold, and the second MAC CE includes the CSI report;

[0202] The potential MsgA load size is greater than the sixth threshold, and the MsgA includes a CSI report.

[0203] Optionally, if the UE is configured to send a CSI report during initial access, the second configuration information related to the reference signal configures one or more reference signal timings, including reference signal timings other than the initial downlink BWP; and / or,

[0204] If the UE is not configured to send a CSI report during the initial access process, or if the UE is not configured to include a CSI report in Msg3, or if the UE is not configured to send a CSI report on the PUSCH corresponding to Msg3, the UE will not receive a reference signal outside of the initial downlink BWP.

[0205] Optionally, the frequency domain location of the second reference information is determined based on at least one of the following:

[0206] The offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the frequency domain resource group where the reference signal is located on the common resource block grid;

[0207] The offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the initial BWP or default BWP of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0208] The offset between the Physical Resource Block (PRB) index of the starting frequency domain location of the second reference information and the center frequency point of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0209] Optionally, the period of the second reference signal is determined based on at least one of the following:

[0210] Relationship with SSB cycle;

[0211] Relationship with discontinuous reception DRX period;

[0212] Relationship with paging cycle;

[0213] Relationship with upward and downward allocation cycles;

[0214] The relationship with the timing of random access transmission.

[0215] Optionally, it also includes:

[0216] Listen to the third PDCCH, which includes indication information related to the modulation and coding strategy (MCS). The MCS-related indication information is used to indicate one of the multiple MCS tables.

[0217] The third PDSCH is received, and the MCS of the third PDSCH is determined based on the third PDCCH and channel state information.

[0218] Optionally, the configuration information related to the first downlink frequency domain resource group includes information related to the first bandwidth of the first downlink frequency domain resource group, as well as information related to available frequency domain resource units outside the first bandwidth.

[0219] Optionally, the information related to the available frequency domain resource units includes at least one of the following:

[0220] Frequency domain reference points for available frequency domain resource units;

[0221] The seventh offset is the offset of the lowest available frequency domain resource element from the frequency domain reference point.

[0222] The number of available frequency domain resource units.

[0223] Optionally, the frequency domain reference point includes at least one of the following:

[0224] The lowest frequency domain resource unit of the first downlink frequency domain resource group

[0225] The highest frequency domain resource unit of the first downlink frequency domain resource group

[0226] The next higher frequency frequency resource unit in the highest frequency resource unit of the first downlink frequency domain resource group.

[0227] Public reference point A.

[0228] Optionally, if the second PDSCH corresponding to MsgB includes indication information related to the transmission of SRS; and / or if the second PDSCH includes indication information related to time-domain resources and / or frequency-domain resources for the transmission of SRS, it further includes:

[0229] Send the Sound Reference Signal (SRS).

[0230] According to another aspect of the present disclosure, a method performed by a base station in a communication system is provided, the method comprising:

[0231] Receive preamble;

[0232] A random access response is sent in the first downlink frequency domain resource group, which includes an uplink grant. The first downlink frequency domain resource group includes downlink frequency domain resources used for transmitting system information and / or synchronization signals.

[0233] A second reference signal is transmitted in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group;

[0234] Receive the Physical Uplink Shared Channel (PUSCH), which is scheduled by uplink grant and includes a Channel State Information (CSI) report related to the second reference signal.

[0235] On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is transmitted.

[0236] According to another aspect of the embodiments of this disclosure, another method performed by a base station in a communication system is provided, the method comprising:

[0237] A second reference signal is transmitted in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group, and the first downlink frequency domain resource group includes downlink frequency domain resources for transmitting system information and / or synchronization signals;

[0238] The MsgA is received during the two-step random access process. The PUSCH corresponding to MsgA includes a Channel State Information (CSI) report related to the second reference signal.

[0239] On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is transmitted.

[0240] According to another aspect of the embodiments of the present disclosure, a user equipment is provided, the user equipment comprising:

[0241] transceiver, and

[0242] A processor, coupled to a transceiver and configured to perform methods executed by a UE in a communication system provided in embodiments of this disclosure.

[0243] According to another aspect of the present disclosure, a base station is provided, the base station comprising:

[0244] transceiver, and

[0245] The processor is coupled to the transceiver and configured to perform methods executed by the base station in the communication system provided in embodiments of this disclosure.

[0246] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements a method performed by a UE or a base station in the communication system provided in the present disclosure.

[0247] According to another aspect of the present disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements a method performed by a UE or a base station in a communication system provided in the present disclosure.

[0248] The communication method, user equipment, and base station provided in the embodiments of this disclosure can improve downlink spectrum efficiency. Attached Figure Description

[0249] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below.

[0250] Figure 1A schematic diagram of a wireless network provided in an embodiment of this disclosure;

[0251] Figure 2 A schematic diagram of a base station provided in an embodiment of this disclosure;

[0252] Figure 3 A schematic diagram of a user equipment provided in an embodiment of this disclosure;

[0253] Figure 4 A schematic diagram of a four-step random access process provided in an embodiment of this disclosure;

[0254] Figure 5 A flowchart illustrating a method executed by a UE in a communication system according to an embodiment of this disclosure;

[0255] Figure 6 This is a schematic diagram of a frequency domain resource group provided in an embodiment of the present disclosure;

[0256] Figure 7 A schematic diagram of a virtual carrier provided in an embodiment of this disclosure;

[0257] Figure 8 A schematic diagram of an anchor carrier and a supplementary carrier provided for an embodiment of this disclosure;

[0258] Figure 9 A schematic diagram of a second MAC CE provided in an embodiment of this disclosure;

[0259] Figure 10 A schematic diagram of ΔK2 provided in an embodiment of this disclosure;

[0260] Figure 11 A flowchart illustrating a method executed by a UE in another communication system provided in this disclosure embodiment;

[0261] Figure 12 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. Detailed Implementation

[0262] Before proceeding with the following detailed description, it may be advantageous to define certain words and phrases used throughout the patent literature. The term “connection” and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether those elements are physically in contact with each other. The terms “transmit,” “receive,” and “transmit,” and their derivatives encompass both direct and indirect communication. The terms “comprise” and “include,” and their derivatives mean inclusion without limitation. The term “or” is concurrent, meaning both and / or. The phrase “associated with,” and its derivatives mean including, being included in, interconnected with, containing, being contained within, connected to or connected with, coupled to or coupled with, able to communicate with, cooperate with, intertwine, juxtapose, proximate, bound to or bound with, having, possessing attributes, having a relationship with, or having a relationship with, etc. 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 in a combination of hardware and software and / or firmware. The functionality associated with any particular controller, whether local or remote, can be centralized or distributed. The phrase "at least one" when used to list items means that different combinations of one or more of the listed items can be used, and it is possible that only one item in the list is 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 only A, only B, and only C. Similarly, the term "set" means one or more. Therefore, a set of items can be a single item or a set of two or more items.

[0263] Furthermore, various functions can be implemented or supported by one or more computer programs, each 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, associated data, or portions thereof suitable for implementation in appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, compact disc (CD), digital video disc (DVD), or any other type of storage. "Non-transitory" computer-readable media excludes wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media in which data can be permanently stored and media such as rewritable optical discs or erasable memory devices in which data can be stored and later rewritten.

[0264] Definitions for certain other words and phrases are provided throughout this patent document. Those skilled in the art will understand that, in many, if not the most, instances, such definitions apply to both prior and future use of the words and phrases defined in this way.

[0265] The figures and various embodiments included herein, used to illustrate the principles of this disclosure, are merely illustrative and should not be construed in any way as limiting the scope of this disclosure. Furthermore, those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged wireless communication system.

[0266] The following Figures 1 to 3 Various embodiments of this disclosure implemented in wireless communication systems are described. Figures 1 to 3 The description does not imply any physical or architectural limitations on the ways in which different embodiments can be implemented. Different embodiments of this disclosure can be implemented in any suitably arranged communication system.

[0267] Figure 1 An example wireless network according to an embodiment of this disclosure is shown. Figure 1 The embodiments of the wireless network shown are for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.

[0268] like Figure 1As shown, the wireless network includes a base station (next generation nodeB, gNB or gNodeB) 101, gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130 such as the Internet, Internet Protocol (IP) networks, or other data networks.

[0269] gNB 102 provides wireless broadband access to network 130 to multiple first user equipments (UEs) within coverage area 120 of gNB 102. The multiple first UEs include UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R1); UE 115, which may be located in a second residence (R2); and UE 116, which may be a mobile device (M) such as a cellular phone, wireless laptop, or wireless personal digital assistant (PDA). gNB 103 provides wireless broadband access to network 130 to multiple second UEs within coverage area 125 of gNB 103. The multiple second UEs include UE 115 and UE 116, and subscriber stations (SS, such as UEs) 117, 118, and 119. In some embodiments, one or more of gNBs 101-103 may communicate with each other and UEs 111-116 using existing wireless communication technologies, and one or more of UEs 111-119 may communicate directly with each other (e.g., UEs 117-119) using other existing or proposed wireless communication technologies.

[0270] Depending on the network type, the term "base station" or "BS" can refer to any component (or set of components) configured to provide wireless access to a network, such as a transmit point (TP), transmit-receive point (TRP), enhanced (or "evolved") base station (eNodeB or eNB), 5G base station (gNB), macro cell, femtocell, wireless fidelity (WiFi) access point (AP), or other wireless-capable devices. A base station can provide wireless access according to one or more wireless communication protocols, such as 3GPP 5G new radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE A), high-speed packet access (HSPA), WiFi 802.11a / b / g / n / ac, etc. For convenience, various names for base station type devices and functions may be used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, the term "User Equipment" (UE) can refer to any component such as a mobile station (MS), user station (SS), remote terminal, wireless terminal, receiving point, or user device. For convenience, various names for user equipment type devices and functions may be used interchangeably in this patent document to refer to remote wireless devices that wirelessly access the BS regardless of whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (such as a desktop computer or vending machine).

[0271] The dashed lines indicate the approximate extent of coverage areas 120 and 125, which are shown as roughly circular for illustrative and explanatory purposes only. It should be clearly understood that coverage areas such as 120 and 125 associated with the gNB can have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the wireless environment associated with natural and man-made obstacles.

[0272] As described in more detail below, one or more of UEs 111-119 include circuitry, programming, or a combination thereof. In some embodiments, one or more of gNBs 101-103 include circuitry, programming, or a combination thereof.

[0273] although Figure 1 An example of a wireless network is shown, but more can be found on... Figure 1Various modifications can be made. For example, wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement. Furthermore, gNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. Additionally, gNBs 101, 102, and / or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0274] Figure 2 An example base station according to an embodiment of the present disclosure is shown. Figure 2 The embodiment of gNB 102 shown is for illustrative purposes only, and Figure 1 gNBs 101 and 103 can have the same or similar configurations. However, gNBs come in a variety of configurations, and Figure 2 This disclosure is not intended to limit the scope to any particular implementation of gNB.

[0275] like Figure 2 As shown, gNB 102 includes multiple antennas 200a-200n, multiple radio frequency (RF) transceivers 201a-201n, transmit (TX) processing circuitry 203, and receive (RX) processing circuitry 204. gNB 102 also includes a controller / processor 205, a memory 206, and a backhaul or network interface 207.

[0276] RF transceivers 201a-201n receive incoming RF signals from antennas 200a-200n, such as signals transmitted by the UE in network 100. RF transceivers 201a-201n down-convert the incoming RF signals to generate intermediate frequency (IF) or baseband signals. The IF or baseband signal is sent to RX processing circuitry 204, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 204 sends the processed baseband signal to controller / processor 205 for further processing.

[0277] The TX processing circuit 203 receives analog or digital data (such as voice data, web data, email, or interactive video game data) from the controller / processor 205. The TX processing circuit 203 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 201a-201n receive the processed baseband or IF signal from the TX processing circuit 203 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 201a-201n.

[0278] The controller / processor 205 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 205 may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceivers 201a-201n, the RX processing circuit 204, and the TX processing circuit 203, according to known principles. The controller / processor 205 may also support additional functions, such as more advanced wireless communication functions.

[0279] For example, the controller / processor 205 can support beamforming or directional routing operations, where signals emitted from multiple antennas 200a-200n are weighted differently to effectively redirect the emitted signals in the desired direction. Any of a variety of other functions can be supported in the gNB 102 via the controller / processor 205.

[0280] The controller / processor 205 is also capable of executing programs and other processes located in the memory 206, such as the operating system (OS). The controller / processor 205 can move data into or out of the memory 206 as needed by the executing process.

[0281] The controller / processor 205 is also connected to a backhaul or network interface 207. The backhaul or network interface 207 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or over a network. Interface 207 can support communication via any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G, LTE, or LTE A), interface 207 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, interface 207 can allow the gNB 102 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (such as the Internet). Interface 207 includes any suitable structure that supports communication via wired or wireless connections such as Ethernet or RF transceivers.

[0282] Memory 206 is connected to controller / processor 205. A portion of memory 206 may include random access memory (RAM), and another portion of memory 206 may include flash memory or other read-only memory (ROM).

[0283] although Figure 2 An example of gNB 102 is shown, but it is possible to see more. Figure 2 Various changes can be made. For example, gNB 102 can include any number of Figure 2 Each component is shown in the diagram. As a specific example, an access point may include multiple interfaces 207, and the controller / processor 205 may support routing functionality to route data between different network addresses. As another specific example, although shown as a single instance of TX processing circuitry 203 and a single instance of RX processing circuitry 204, gNB102 may include multiple instances of each (such as one per RF transceiver). For example, Figure 2 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed.

[0284] Figure 3 An example user equipment according to an embodiment of the present disclosure is shown. Figure 3 The embodiment of UE 116 shown is for illustrative purposes only, and Figure 1 UEs 111-115 and 117-119 can have the same or similar configurations. However, UEs appear in multiple configurations, and Figure 3 This disclosure is not intended to limit the scope to any particular implementation of the UE.

[0285] like Figure 3 As shown, UE 116 includes an antenna 301, a radio frequency (RF) transceiver 302, a TX processing circuit 303, a microphone 304, and a receive (RX) processing circuit 305. UE 116 also includes a speaker 306, a controller or processor 307, an input / output (I / O) interface (IF) 308, an input device 309, a touchscreen display 310, and memory 311. Memory 311 includes an OS 312 and one or more applications 313.

[0286] RF transceiver 302 receives incoming RF signals transmitted by gNB of network 100 from antenna 301. RF transceiver 302 down-converts the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 305, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 305 sends the processed baseband signals to speaker 306 (e.g., for voice data) or processor 307 for further processing (e.g., for web browsing data).

[0287] TX processing circuit 303 receives analog or digital voice data from microphone 304 or other outgoing baseband data (such as web data, email, or interactive video game data) from processor 307. TX processing circuit 303 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 302 receives the processed baseband or IF signal from TX processing circuit 303 and up-converts the baseband or IF signal into an RF signal transmitted via antenna 301.

[0288] Processor 307 may include one or more processors or other processing devices and executes OS 312 stored in memory 311 to control the overall operation of UE 116. For example, processor 307 may control the reception of forward channel signals and the transmission of reverse channel signals by RF transceiver 302, RX processing circuitry 305, and TX processing circuitry 303 according to known principles. In some embodiments, processor 307 includes at least one microprocessor or microcontroller.

[0289] Processor 307 is also capable of executing other processes and programs located in memory 311, such as processes for CSI reporting on the uplink channel. Processor 307 can move data into or out of memory 311 as needed for executing processes. In some embodiments, processor 307 is configured to execute application 313 based on OS 312 or in response to signals received from gNB or operator. Processor 307 is also coupled to I / O interface 308, which provides UE 116 with the ability to connect to other devices such as laptops and laptops. I / O interface 308 is the communication path between these accessories and processor 307.

[0290] The processor 307 is also connected to the touchscreen display 310. The user of the UE 116 can use the touchscreen display 310 to input data into the UE 116. The touchscreen display 310 can be a liquid crystal display, a light-emitting diode display, or other display capable of rendering text and / or at least limited graphics such as those from a website.

[0291] Memory 311 is connected to processor 307. A portion of memory 311 may include RAM, and another portion of memory 311 may include flash memory or other ROM.

[0292] although Figure 3 An example of UE 116 is shown, but it is possible to modify it. Figure 3 Make various changes. For example, Figure 3 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed. As a specific example, processor 307 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Moreover, although... Figure 3 The UE 116 is shown configured as a mobile phone or smartphone, but the UE can be configured to operate as other types of mobile or fixed devices.

[0293] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings. The text and drawings are provided as examples only to help the reader understand this disclosure. They are not intended and should not be construed as limiting the scope of this disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based on the content disclosed herein, that changes can be made to the illustrated embodiments and examples without departing from the scope of this disclosure.

[0294] Transmissions in a wireless communication system include: transmission from the base station (gNB) to the user equipment (UE) (referred to as downlink transmission), with the corresponding time slots called downlink time slots; and transmission from the UE to the base station (referred to as uplink transmission), with the corresponding time slots called uplink time slots.

[0295] In downlink communication of a wireless communication system, the system periodically sends synchronization signals and broadcast channels to users through synchronization signal blocks (SSB / Physical Broadcast Channel, PBCH, or downlink reference signal). This period is called the synchronization signal block period (e.g., SSB periodicity) or synchronization signal block group period (SSB burst periodicity). Simultaneously, the base station configures a random access channel configuration period (PRACH configuration period). Within this period, a certain number of random access transmission occasions (ROs) are configured. These configured ROs are evaluated according to certain validity rules to obtain valid ROs, and all SSBs are mapped to their corresponding valid ROs within the association period (a certain time length). In an SSB-to-RO mapping cycle, all SSBs within an SSB period are mapped to the required random access resources. A mapping cycle can have one or more mapping cycles. An association pattern period from SSB to RO contains one or more association patterns, and the association pattern from SSB to RO is the same in each association pattern period.

[0296] In New Radio (NR) communication systems, the performance of random access directly impacts user experience before radio resource control (RRC) is established, such as during the random access process. In traditional wireless communication systems, such as LTE and LTE-Advanced, or in 5G or NR systems, the random access process is applied to various scenarios, including establishing an initial link, cell handover, re-establishing an uplink link, and RRC connection reconstruction. It is categorized into contention-based random access and contention-free random access based on whether the user has exclusive access to the preamble sequence resource. In contention-based random access, each user selects a preamble sequence from the same preamble sequence resource during the uplink link establishment process.

[0297] For example, a contention-based random access procedure consists of four steps. Figure 4 A schematic diagram of the four-step random access process is shown:

[0298] In the first step, the user randomly selects a preamble sequence from the preamble sequence (also interchangeably called "preamble code") resource pool and sends it to the base station. The base station performs correlation detection on the received signal to identify the preamble sequence sent by the user.

[0299] In the second step, the base station sends a Random Access Response (RAR) to the user, which includes a random access preamble identifier, a timing advance instruction determined based on the delay estimate between the user and the base station, a Cell-Radio Network Temporary Identifier (C-RNTI), and time-frequency resources allocated for the user's next uplink transmission. The user searches for the PDCCH (Physical Downlink Control Channel) carrying this feedback based on the RA-RNTI (Random Access-RNTI) associated with the timing of sending the random access preamble PRACH (Physical Random Access Channel). The RA-RNTI associated with the timing of sending the random access preamble PRACH (PRACHoccasion, RO) is calculated using the following formula:

[0300] RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

[0301] Wherein, s_id is the index of the first OFDM (Orthogonal Frequency Division Multiplexing) symbol of the PRACH timing (0≤s_id<14), t_id is the index of the first slot of the PRACH timing in the system frame (0≤t_id<80), where, for μ={0,1,2,3}, the subcarrier spacing used to determine t_id is based on the specified value of μ, for μ={5,6}, t_id is the index of the 120kHz slot containing the PRACH timing in the system frame (0≤t_id<80), f_id is the index of the PRACH timing in the frequency domain (0≤f_id<8), ul_carrier_id is the uplink carrier used for random access preamble transmission, which is 0 for normal uplink (NUL) carriers and 1 for SUL (supplementary uplink) carriers;

[0302] In the third step, the user sends a third message (Message 3, Msg3) to the base station based on the information in the RAR. Msg3 contains information such as the user terminal identifier and the RRC connection request. The user terminal identifier is unique to the user and is used to resolve conflicts.

[0303] In the fourth step, the base station sends a conflict resolution identifier to the user, which includes the identifier of the winning user terminal in the conflict resolution process. After detecting its own identifier, the user upgrades its temporary C-RNTI to a formal C-RNTI and sends an ACK (ACK knowledge character) signal to the base station, completing the random access procedure and waiting for the base station's scheduling. Otherwise, the user will begin a new random access procedure after a delay.

[0304] For a contention-free random access procedure, since the base station knows the user's identifier, it can allocate a preamble sequence for the user. Therefore, when sending the preamble sequence, the user does not need to randomly select a sequence but will use the allocated preamble sequence. After detecting the allocated preamble sequence, the base station will send a corresponding random access response, including timing advance and uplink resource allocation information. After receiving the random access response, the user considers uplink synchronization complete and waits for further scheduling by the base station. Therefore, the contention-free random access procedure consists of only two steps: step one is the UE sending the preamble sequence; step two is the base station sending the random access response.

[0305] In NR systems, in order to be compatible with UEs with different capabilities, during the initial access process, the UE only transmits signals through the initial uplink / downlink BWP (Bandwidth Part), which results in low downlink spectrum efficiency.

[0306] In view of at least one of the above-mentioned technical problems or areas requiring improvement in the related technologies, this disclosure proposes a communication method, user equipment, and base station, specifically a random access scheme that can improve downlink spectrum efficiency.

[0307] The following description of several exemplary embodiments illustrates the technical solutions of this disclosure and the technical effects produced by these solutions. It should be noted that the following embodiments can be referenced, learned from, or combined with each other. Identical terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0308] This disclosure provides a method executed by a UE in a communication system, such as... Figure 5 As shown, the method includes:

[0309] Step S502: Send the preamble;

[0310] Step S503: Receive a random access response in the first downlink frequency domain resource group, the random access response including an uplink grant (UL grant), the first downlink frequency domain resource group including downlink frequency domain resources for transmitting system information and / or synchronization signals;

[0311] Step S504: Receive a second reference signal in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group;

[0312] Step S505: Send PUSCH (Physical Uplink Shared Channel), which is scheduled by uplink grant and includes a CSI (Channel State Information) report related to the second reference signal.

[0313] Step S510: Receive the third PDSCH (Physical Downlink Shared Channel) on the second downlink frequency domain resource group.

[0314] The method executed by the UE in the communication system provided in this embodiment allows the UE to report downlink channel state information corresponding to frequency domain resources other than the initial downlink BWP, thereby selecting appropriate transmission parameters for the UE based on the downlink channel state information to improve downlink spectrum efficiency.

[0315] Optionally, a third PDSCH may be received on the first downlink frequency domain resource group and the second downlink frequency domain resource group.

[0316] The method provided in this disclosure also includes:

[0317] Step S501: Receive first configuration information related to at least two downlink frequency domain resource groups and second configuration information related to a second reference signal. The at least two downlink frequency domain resource groups include a first downlink frequency domain resource group and a second downlink frequency domain resource group. The second reference signal is associated with the second downlink frequency domain resource group.

[0318] In this embodiment of the disclosure, the configured second downlink frequency domain resource group may include one or more.

[0319] Optionally, step S502 is based on Msg1 sent during the four-step random access process.

[0320] Optionally, CSI reports related to the second reference signal can also be sent in Msg1.

[0321] Optionally, step S503 is based on Msg2 reception during the four-step random access process.

[0322] In this embodiment of the disclosure, a "frequency domain resource group" refers to a continuous segment of spectrum resources. The UE can transmit or receive physical channels and / or physical signals on a frequency domain resource group. It can be understood that a frequency domain resource group is a continuous segment of spectrum resources that the UE can use to transmit or receive signals. Figure 6 As shown, the first downlink frequency domain resource group has a bandwidth of X MHz and includes X0 subcarriers, and the second downlink frequency domain resource group has a bandwidth of Y MHz and includes Y0 subcarriers. There is a certain interval, for example, Z MHz, between the highest index subcarrier of the first downlink frequency domain resource group and the lowest index subcarrier of the second downlink frequency domain resource group.

[0323] In the embodiments of this disclosure, the frequency domain resource group can also be equivalently replaced by one of the following: carrier, bandwidth part, carrier segment, or carrier segment, etc.

[0324] In the following text, for ease of description, the first downlink frequency domain resource group may be simply referred to as the first frequency domain resource group, and the second downlink frequency domain resource group may be simply referred to as the second frequency domain resource group. Alternatively, the first frequency domain resource group may include the first uplink frequency domain resource group and the first downlink frequency domain resource group, and the second frequency domain resource group may include the second uplink frequency domain resource group and the second downlink frequency domain resource group.

[0325] The technical solutions provided in this disclosure can be applied to at least one of the following scenarios:

[0326] Scenario 1: Fragmented spectrum

[0327] In mobile communication systems, a single operator typically possesses multiple available contiguous spectrum bands, with bandwidth generally limited in the sub-3 GHz range, particularly the sub-1 GHz band. Globally, 95% of the contiguous 1.4–2.6 GHz FDD (Frequency Division Duplex) spectrum in the sub-3 GHz range has a bandwidth of no more than 30 MHz, and 90% of operators own more than one 1.4–2.6 GHz FDD band. Similarly, the sub-1 GHz (700 / 800 / 900 MHz) spectrum faces the same issue. 93% of the contiguous sub-1 GHz FDD spectrum has a bandwidth of no more than 15 MHz, and 71% of operators own more than one sub-1 GHz FDD band. Although these FDD bands are not contiguous in the spectrum, the aggregated bandwidth of combining these bands is considerable. Aggregated FDD carriers can provide similar DL (Downlink) bandwidth and 2.4 times the UL (Uplink) bandwidth as C-band TDD (Time Division Duplex) carriers. More importantly, the sub-3GHz spectrum offers coverage advantages. In addition to the aforementioned FDD bands, there are several SUL bands in the Sub-3GHz range (e.g., n97, n98, n95) that can be used to improve operators' UL coverage and capacity. In the future, operators will deploy more sub-3GHz spectrum to meet the growing demands of both ToB (To Business) and ToC (To Customer) scenarios. Furthermore, as more spectrum is allocated for mobile communications, operators will deploy more spectrum across various frequency bands to meet the increasing demand for data rates.

[0328] like Figure 7 As shown, four frequency domain resource groups with bandwidths of 5MHz, 10MHz, 20MHz, and 15MHz can constitute a virtual carrier with a bandwidth of 50MHz. These four frequency domain resource groups can belong to different frequency bands. Figure 7 It can be seen that a virtual carrier is formed by aggregating multiple frequency domain resource groups with discontinuous frequencies, and the bandwidth of the virtual carrier is the sum of the bandwidths of multiple frequency domain resource groups.

[0329] Furthermore, the multiple frequency domain resource groups constituting the virtual carrier may contain spectrum allocated to different communication systems. For example, one frequency domain resource group may belong to the spectrum of the 6G system, while another frequency domain resource group may be spectrum that originally belonged to the 5G system but has been reassigned to the 6G system.

[0330] Among the multiple frequency domain resource groups that constitute a virtual carrier, the frequency domain resource group used for transmitting SSB and SIB1 (System Information Block 1) can be called the primary frequency domain resource group or the first frequency domain resource group, while the other frequency domain resource groups can be called the secondary frequency domain resource group or the second frequency domain resource group.

[0331] Scenario 2: Anchor Carrier and Supplementary Carrier

[0332] In this scenario, multiple carriers (frequency domain resource groups) are deployed within a serving cell. The functions of these multiple carriers can differ. For example, one of the multiple carriers is called the anchor carrier, and the anchor carrier has at least one of the following functions:

[0333] (1) Provide initial synchronization and basic system information transmission for UEs within the cell. For example, at least a synchronization signal (SS), a physical broadcast channel, and a first system information block should be periodically transmitted on the downlink anchor carrier. Among them, the synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). For example, the anchor carrier should at least transmit the SSB and SIB1 for defining the cell (CD).

[0334] (2) Provide initial random access functionality for UEs within the cell. For example, the cell-common physical random access channel resources should be configured on the uplink anchor carrier.

[0335] (3) Provide mobility management functions for UEs within the cell. For example, the UE performs measurements for radio resource management (RRM) purposes based only on reference signals (such as SSB and / or CSI-RS) on the downlink anchor carrier, without having to perform RRM measurements on other carriers.

[0336] To achieve the above functions, anchor carriers generally operate at lower frequencies than other carriers, resulting in a wider coverage area. Furthermore, anchor carriers can provide basic data transmission capabilities for UEs within the cell; however, due to their typically smaller bandwidth, the peak data transmission rate is lower.

[0337] A carrier other than the anchor carrier can serve as a supplement to the anchor carrier, and is therefore called a supplementary carrier. For a supplementary downlink (SDL), the SDL is mainly used to supplement data transmission services, for example, to provide data transmission services with a higher peak rate than the anchor carrier. For a supplementary uplink (SUL), the SUL is used to supplement data transmission services and / or to supplement coverage, for example, to provide data transmission services with a higher peak rate than the anchor carrier and / or to provide wider coverage than the anchor carrier.

[0338] like Figure 8 As shown, carrier f1 is the anchor carrier, which can provide basic coverage and data transmission services for the cell, while carriers f2 and f3 are supplementary carriers, which can provide supplementary data services for hotspot areas within the cell.

[0339] In this embodiment of the disclosure, the anchor carrier may also be referred to as the primary carrier, or other technical terms such as ordinary carrier, and may correspond to the first frequency domain resource group mentioned above. The supplementary carrier may also be referred to as the secondary carrier, data carrier, or other technical terms, and may correspond to the second frequency domain resource group mentioned above.

[0340] Scenario 3: Overlapping CA (Carrier Aggregation) Scheme

[0341] Some operators' available spectrum does not match the channel bandwidth specified by the NR system. For example, in the n5 band, operators have 7MHz and 11MHz, which do not conform to the NR system's specified channel bandwidth of 5MHz and 10MHz. The industry has proposed several techniques for reusing existing channel bandwidth, which can include, but is not limited to, overlapping UE channel bandwidth and / or bandwidth larger than the operator's licensed bandwidth. Overlapping CA schemes support the use of irregular spectrum without introducing new dedicated channel bandwidth for the UE and BS. From a network perspective, the BS supports in-band overlapping CA, while the UE only supports a single CC (Component Carrier) with existing channel bandwidth. From a UE perspective, both the BS and UE support in-band overlapping CA using all RBs (Resource Blocks), and the UE also supports combining in-band non-contiguous CAs. This approach can be applied to irregular channel bandwidths of various sizes without requiring the definition of new channel filters to be designed and tested for the BS and UE. No new channel filters need to be designed and tested for the UE.

[0342] Optionally, the first downlink frequency domain resource set and the second downlink frequency domain resource set can be contiguous. The first downlink resource set and the second downlink resource set belong to different cells, and there is at least one frequency domain resource element overlap between the first downlink resource set and the second downlink resource set. Alternatively, the first downlink resource set and the second downlink resource set belong to the same cell, and the UE uses two sets of filters to receive the first downlink resource set and the second downlink resource set respectively. This requires the UE to have specific capabilities, such as being able to use two sets of filters simultaneously.

[0343] Based on the scenarios described above, when an operator has multiple consecutive spectrum resources available, it can use them as a single cell by deploying one or more consecutive spectrum resources on each spectrum segment. The physical meaning of consecutive spectrum resources is a set comprising N0 consecutive resource elements or resource blocks in the frequency domain, where each resource element is an OFDM subcarrier. A resource block contains a certain number of consecutive resource elements; optionally, a resource block contains 12 consecutive resource elements. Resource blocks can also be common resource blocks, physical resource blocks, virtual resource blocks, etc. The reference position of the index of a common resource block (or physical or virtual resource block) can be the minimum index subcarrier of a frequency domain resource group, a predefined or configured frequency domain reference point, or the minimum index subcarrier of other frequency domain resource groups.

[0344] When a cell contains multiple frequency domain resource groups, for a UE in an idle / inactive state, system information (such as SSB, SIB, RMSI (Remaining Minimum System Information), and OSI (Other System Information)) and paging of the serving cell can only be broadcast in one of the multiple downlink frequency domain resource groups within the serving cell. System information can include the necessary information for each frequency domain resource group (such as frequency, bandwidth, SCS (Sub-Carrier Spacing), RACH (Random Access Channel) resources, etc.). Therefore, the UE can see and access all frequency domain resource groups.

[0345] In one alternative implementation, the UE receives SSB and system information in the first (anchored) downlink frequency domain resource group and performs initial access on the first (anchored) uplink frequency domain resource group.

[0346] In the embodiments of this disclosure, the frequency domain resource unit (also called a frequency resource unit, frequency domain unit, or frequency unit) can be: a subcarrier, a subcarrier group (composed of multiple subcarriers), a resource block (RB), also called a physical resource block (PRB), a resource block group (composed of multiple RBs), a band portion (BWP), a band portion group (composed of multiple BWPs), a band / carrier, a band group / carrier group; it can also be an absolute frequency domain unit, such as 1 Hz, 1 kHz, etc.; the frequency domain unit can also be a combination of multiple granularities, such as M1 PRBs plus M2 subcarriers, etc.

[0347] In the embodiments of this disclosure, the time-domain resource unit (also referred to as a time-domain unit, time resource unit, or time unit) can be: an OFDM symbol, an OFDM symbol group (composed of multiple OFDM symbols), a slot, a slot group (composed of multiple slots), a subframe, a subframe group (composed of multiple subframes), a system frame, or a system frame group (composed of multiple system frames); it can also be an absolute time unit, such as 1 millisecond, 1 second, etc.; the time unit can also be a combination of multiple granularities, such as N1 slots plus N2 OFDM symbols, etc. It can also be the duration of an OOK (On-Off Keying) chip.

[0348] The CSI in this disclosure embodiment may include at least one of the following: Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indication (RI), Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), Reference Signal-Signal to Interference plus Noise Ratio (RS-SINR), Received Signal Strength Indication (RSSI), an indication of the number of repetitions required to decode or detect the downlink channel, CSI-RS resource indicator (CRI), SS / PBCH Block Resource Indicator (SSBRI), layer indicator (LI), L1 (Layer 1)-RSRP, L1-SINR, Capability Index, or Time-Domain Channel Properties (TDCP).

[0349] Furthermore, CSI may also include one of the following: Cross Link Interference (CLI), signal-to-noise and interference ratio, and reference signal antenna relative phase; even further, CSI may also include one of the following: CSI RSRP (CSI Reference Signal Received Power), CSI RSRQ (CSI Reference Signal Received Quality), Synchronization Signal Reference Signal Received Power, and Synchronization Signal Reference Signal Received Quality.

[0350] For the embodiments of this disclosure, the above description of the methods does not limit the order in which different steps are executed. Some examples are given below.

[0351] Optionally, the UE receives system messages, such as SIB1, SIBx (where x is a positive integer), which include first configuration information related to at least two downlink frequency domain resource groups.

[0352] Optionally, the UE receives a system message, which includes first configuration information related to at least two downlink frequency domain resource groups and second configuration information related to a second reference signal.

[0353] Optionally, the UE first receives a first message (e.g., SIB1), which includes first configuration information related to at least two downlink frequency domain resource groups, and then receives a second message (e.g., SIBx, where x is a positive integer greater than 1) based on the first message, which includes second configuration information related to a second reference signal.

[0354] Optionally, step S504 may be performed before step 501.

[0355] For example, before step 501, the UE receives the SSB, the UE receives the second reference signal, or the UE receives both the SSB and the second reference signal. When the UE's operating bandwidth includes both the first downlink frequency domain resource group and the second downlink frequency domain resource group, the UE can receive the second reference signal while receiving the SSB, reducing the UE's access latency.

[0356] For example, before step 501, the UE receives a Wake-Up Signal (WUS) or a paging-related signal, and the UE receives an SSB and a second reference signal. When the UE's operating bandwidth includes the first downlink frequency domain resource group and the second downlink frequency domain resource group, the UE can receive the second reference signal while receiving the SSB, reducing the UE's access latency.

[0357] Optionally, step S504 may be performed after step S502.

[0358] For example, the UE receives a system message, obtains the second configuration information related to the second reference signal based on the system message, sends a preamble, listens to the PDCCH of scheduling Msg2, and receives the second reference signal. The UE then receives the PDSCH corresponding to Msg2 according to the PDCCH. By sending the preamble before receiving the second reference signal, the UE can determine the time-frequency domain position of the second reference signal based on the information in the PDCCH, which is more flexible.

[0359] For example, the UE listens to the PDCCH of scheduler Msg2 and simultaneously receives the second reference signal.

[0360] For example, the UE receives a system message, obtains the second configuration information related to the second reference signal based on the system message, sends a preamble, listens to the PDCCH of scheduling Msg2, receives the PDSCH corresponding to Msg2, and receives the second reference signal. The advantage of this approach is that the UE determines the time-frequency domain position of the second reference signal based on the information in the PDSCH corresponding to Msg2, making it more flexible.

[0361] For example, the UE receives the PDSCH corresponding to Msg2 and also receives the reference signal.

[0362] In this embodiment of the disclosure, the UE can determine the second reference signal based on a wake-up signal or a paging-related signal, or the wake-up signal or a paging-related signal can instruct the UE to report a measurement report related to the reference signal. The paging-related signal can refer to PDCCH or PDSCH.

[0363] In this embodiment of the disclosure, indication information related to the second reference signal may also be received. The indication information related to the second reference signal is used to indicate that at least one set of configurations in the second configuration information is activated. The indication information related to the second reference signal includes at least one of the following: a wake-up signal; a first PDCCH, which includes paging-related information; and a first PDSCH, which includes paging-related information.

[0364] In this embodiment of the disclosure, third configuration information related to the CSI report and first indication information related to the CSI report may also be received. The first indication information is used to indicate that at least one set of configurations in the third configuration information is activated. The first indication information includes at least one of the following: a wake-up signal; a first PDCCH, which includes paging-related information; a first PDSCH, which includes paging-related information; an activation command in a second PDSCH, which includes a random access response; a first downlink control information (DCI) for scheduling the second PDSCH; a MAC subheader of the second PDSCH; a random access response; and an uplink grant.

[0365] In this embodiment of the disclosure, a second indication information related to a CSI report may also be received, the second indication information being used to indicate whether to send a CSI report; wherein, the first indication information includes at least one of the following: third configuration information related to a CSI report; a wake-up signal; a first PDCCH, the first PDCCH including paging-related information; a first PDSCH, the first PDSCH including paging-related information; an activation command in a second PDSCH, the second PDSCH including a random access response; a first DCI for scheduling the second PDSCH; and a random access response.

[0366] Specifically, the method provided in this disclosure may further include at least one of steps S506, S507, and S508.

[0367] Step S506: Receive a wake-up (WUS) signal, which includes indication information (first indication information and / or second indication information) related to the second reference signal and / or indication information (first indication information and / or second indication information) related to the CSI report.

[0368] For example, the WUS signal contains a bit that, when set to 1, instructs the UE to report a CSI (or simply perform CSI reporting). Optionally, it instructs the UE to perform CSI reporting during the initial access phase. When the bit is 0, it instructs the UE not to perform CSI reporting during the initial access phase.

[0369] For example, the WUS signal includes indication information related to the second reference signal, such as information indicating the time-domain / frequency-domain resources of the second reference signal. Thus, a UE that supports simultaneous reception of two downlink frequency-domain resource groups can acquire indication information related to the second reference signal and / or indication information related to the CSI report while receiving the WUS signal. This allows it to receive the second reference signal on the second frequency-domain resource group simultaneously with the SSB / TRS (Tracking Reference Signal), reducing UE access latency.

[0370] Optionally, the UE receives a WUS signal and determines whether to listen to paging-related signals based on the WUS signal.

[0371] Step S507: Listen to the first PDCCH, which includes paging-related information and indication information related to the second reference signal and / or indication information related to CSI reporting (first indication information and / or second indication information).

[0372] Step S508: Receive a first PDSCH, which includes paging-related information and indication information related to a second reference signal and / or indication information related to a CSI report (first indication information and / or second indication information).

[0373] Optionally, the UE listens to a first PDCCH scrambled with P-RNTI (Paging-RNTI), wherein the first PDCCH schedules a first PDSCH containing paging information, or the first PDCCH contains a short message, and the first PDCCH may include indication information related to the second reference signal and / or indication information related to CSI reporting. Alternatively, the PDSCH containing paging information may include indication information related to the second reference signal and / or indication information related to CSI reporting. In this way, a UE that supports simultaneous reception of two downlink frequency domain resource groups can acquire indication information related to the second reference signal and / or indication information related to CSI reporting while receiving the paging-related signal, thereby receiving the second reference signal on the second frequency domain resource group while receiving the SSB / TRS, reducing the UE's access latency.

[0374] In this embodiment of the disclosure, the UE determines the time-domain resources / frequency-domain resources / period and other information of the second reference signal on which the CSI report is based, and the time-domain resources / frequency-domain resources and other information corresponding to the CSI report, based on the indication information related to the second reference signal and / or the indication information related to the CSI report.

[0375] In this embodiment of the disclosure, the UE can receive information related to CSI reporting, and the UE reports a CSI report based on this information. Optionally, the reporting of a CSI report can be triggered by at least one of the following methods:

[0376] Method 1: Receive third configuration information related to the CSI report. The third configuration information is used to instruct the submission of the CSI report.

[0377] Optionally, the indication information related to the CSI reporting is indicated in the system message. The UE receives third configuration information related to the CSI reporting. Optionally, the third configuration information is included in the system information (SIB); for example, SIB1 contains the third configuration information; or, for another example, SIBx contains the third configuration information, where x is a positive integer greater than one.

[0378] Specifically, if the base station is configured with the configuration parameters used for CSI (implicitly activated by optionally configuring the configuration parameters used for CSI), this is the trigger condition for CSI reporting.

[0379] Method 2: Receive third configuration information, which includes indication information related to CSI reporting, and the indication information related to CSI reporting is set to the first value;

[0380] The UE receives third configuration information related to CSI reporting, which includes indication information related to CSI reporting, such as parameters indicating CSI reporting. When the UE is configured with parameters indicating CSI reporting, the UE reports a CSI report related to the second frequency domain resource group; or, when the parameters indicating CSI reporting are set to a first value (e.g., true), the UE should report a CSI report related to the second frequency domain resource group.

[0381] Method 3: Receive third configuration information and activation command, wherein the activation command includes indication information that at least one set of configurations included in the third configuration information is activated.

[0382] In this embodiment of the disclosure, at least one set of CSI reporting configurations included in the third configuration information is activated by an activation command, such as by a field in the activation command.

[0383] Optionally, if the base station is activated (including by displaying activation via specific signaling), this is the trigger condition for CSI reporting.

[0384] In one alternative implementation, the activation command is included in the random access response.

[0385] In another alternative implementation, the activation command is included in a system message.

[0386] In another optional implementation, the activation command includes a first MAC (Medium Access Control) PDU (Protocol Data Unit), wherein the first MAC PDU includes one or more MAC sub-PDUs, and each MAC sub-PDU includes at least one of the following:

[0387] (1) Includes only the MAC subheader (including padding);

[0388] (2) Includes MAC subheader and MAC SDU (Service Data Unit);

[0389] (3 includes the MAC subheader and the first MAC CE (Control Element);

[0390] Optionally, the first MAC PDU includes at least one of the following:

[0391] (1) The identifier of the serving cell, such as the ID (Identity document) of the serving cell;

[0392] (2) The identifier of the downlink frequency domain resource group is as follows: the ID of the downlink frequency domain resource group. The downlink frequency domain resource group can be a portion bandwidth (BWP) or a carrier.

[0393] (3) The identifier of CSI resources, such as the ID of CSI resources. For example, the UE receives configuration information of at least one CSI resource or a group of CSI resources. The activation command includes the ID of the CSI resource. After receiving the activation command, the UE reports the CSI report corresponding to the CSI resource.

[0394] (4) The identifier of the CSI resource group, such as the CSI resource group ID;

[0395] (5) The identifier of the TCI (Transceiver Configuration Indicator) status, such as the TCI status ID, is used to indicate the QCL (Quasi Co-located) source of the second reference signal. TCI status ID0 indicates the TCI status of the first resource in the set, TCI status ID1 indicates the second resource, and so on.

[0396] Method 4: Receive third configuration information and at least one first downlink control information (DCI), wherein the first DCI includes indication information related to the reporting of CSI;

[0397] In this embodiment of the disclosure, at least one CSI report is triggered by at least one downlink control information indication, for example, by indicating the CSI report to be triggered by a field in the downlink control information indicating CSI report.

[0398] Optionally, when the field related to CSI reporting in the first DCI is set to the second value, the UE reports a CSI report related to the second frequency domain resource group; when the field related to CSI reporting is set to the third value, the UE does not report a CSI report related to the second frequency domain resource group.

[0399] Alternatively, at least one row in the TDRA (Time domain resource assignment) table includes first indication information (such as indication information of at least one set of configurations being activated included in the third configuration information), and the first DCI includes a field for indicating at least one row in the TDRA table. Simply put, the TDRA table contains parameters related to the configuration reported by CSI, and the TDRA field in the first DCI indicates a row in the TDRA table. When the parameter related to the configuration reported by CSI in that row takes the fourth value (e.g., true), the UE reports a CSI report related to the second frequency domain resource group; when the parameter related to the configuration reported by CSI in that row takes the fifth value (e.g., false), the UE does not report a CSI report related to the second frequency domain resource group.

[0400] In one example, the parameters related to the configuration reported by CSI can be indexes. The TDRA table contains indexes related to the configuration reported by CSI. The TDRA field in the first DCI indicates a row in the TDRA table. The UE reports the corresponding CSI report based on the value of the index related to the configuration reported by CSI in that row of the TDRA table.

[0401] Optionally, the TDRA table mentioned above is predefined by the protocol or broadcast via system messages.

[0402] Method 5: Receive third configuration information, and the random access response includes indication information related to reporting CSI;

[0403] In this embodiment of the disclosure, the UE receives third configuration information related to CSI reporting and receives indication information related to CSI reporting via RAR. Specifically, 1 bit of the CSI request field in the RAR is used to indicate indication information related to CSI reporting.

[0404] Method 6: The random access response includes indication information related to the reported CSI.

[0405] In this embodiment of the disclosure, the indication information related to CSI reporting received by the UE is transmitted in the RAR. Specifically, 1 bit of the CSI request field in the RAR is used to indicate the indication information related to CSI reporting.

[0406] In this embodiment of the disclosure, after receiving the third configuration information for CSI reporting via RRC signaling, the method further includes: periodically performing CSI measurements based on the configuration information.

[0407] In this embodiment of the disclosure, the triggering of at least one of the above-mentioned methods for reporting a CSI report can specifically be that the CSI report is triggered when a first condition is met, wherein the first condition includes at least one of the following:

[0408] (1) The measurement results of the second downlink frequency domain resource group meet the first threshold requirement;

[0409] For example, when the measurement of the second downlink frequency domain resource group is higher (or lower) than a certain threshold, the UE reports a CSI report related to the second downlink frequency domain resource group; this threshold can be predefined by the protocol or configured through higher-layer information.

[0410] (2) The difference or absolute value of the measurement results of the first downlink frequency domain resource group and the measurement results of the second downlink frequency domain resource group meets the second threshold requirement;

[0411] For example, when the difference or absolute value of the measurement between the first downlink frequency domain resource group and the measurement between the second downlink frequency domain resource group is higher (or lower) than a certain threshold, the UE reports a CSI report related to the second downlink frequency domain resource group; this threshold can be predefined by the protocol or configured through higher-layer information.

[0412] (3) The minimum operating bandwidth supported by the UE is greater than or equal to the bandwidth of the first downlink frequency domain resource group;

[0413] For example, when the minimum working bandwidth supported by the UE is greater than (or greater than or equal to, or not less than) the bandwidth of the first downlink frequency domain resource group, the UE reports a CSI report related to the second downlink frequency domain resource group.

[0414] (4) The minimum working bandwidth supported by the UE is greater than or equal to the first frequency difference, which is the frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group.

[0415] For example, when the minimum working bandwidth supported by the UE is greater than (or greater than or equal to, or not less than) the first frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group, the UE reports a CSI report related to the second downlink frequency domain resource group.

[0416] (5) The minimum working bandwidth supported by the UE is greater than or equal to the second frequency difference, which is the frequency difference between the highest frequency frequency resource element of the first downlink frequency domain resource group and the lowest frequency frequency resource element of the second downlink frequency domain resource group.

[0417] For example, when the minimum operating bandwidth supported by the UE is greater than (or greater than or equal to, or not less than) the second frequency difference between the highest frequency frequency domain resource element of the first downlink frequency domain resource group and the lowest frequency frequency domain resource element of the second downlink frequency domain resource group, the UE reports a CSI report related to the second downlink frequency domain resource group.

[0418] In this embodiment of the disclosure, after the UE sends a preamble associated with a CSI report and / or a preamble associated with at least one set of reference signals, the UE receives a second reference signal in step S504.

[0419] In this embodiment of the disclosure, after the UE sends a preamble associated with a CSI report and / or a preamble associated with at least one set of reference signals, the UE receives activation confirmation information associated with a second reference signal, and the UE receives the reference signal in step S504.

[0420] In this embodiment of the disclosure, the first indication information includes activation (confirmation) information and / or availability indication information related to the second reference signal. The availability indication information is used to indicate the activated reference signal timing among one or more reference signal timings configured by the second configuration information.

[0421] Optionally, the second PDCCH of the scheduling random access response includes activation confirmation information related to the second reference signal.

[0422] For example, the DCI format provided by the second PDCCH contains activation confirmation information related to the second reference signal.

[0423] Optionally, the second PDCCH includes availability indication information related to the second reference signal.

[0424] For example, the DCI format provided by the second PDCCH contains availability indication information related to the second reference signal.

[0425] The number of bits occupied by the availability indication information is related to higher-layer parameters. As an example, the second PDCCH of the RAR scheduling includes an RS availability indication, which includes a bitmap of availability indication information for the reference signal.

[0426] Optionally, the MAC subheader in the second PDSCH corresponding to the random access response includes activation confirmation information. For example, the activation confirmation information may be included in a MAC subheader with a backoff indication, or the activation confirmation information may be included in a MAC subheader with a RAPID (random access preamble identifier).

[0427] Optionally, the MAC sub-header in the second PDSCH includes availability indication information. For example, a MAC sub-header with a backoff indication, or a MAC sub-header with RAPID, etc.

[0428] Optionally, the uplink grant may include availability indication information. For example, the MAC RAR may contain specific fields that include activation confirmation information related to the second reference signal, or fields that indicate availability indication information related to the reference signal; further, the activation confirmation information may also be included in the uplink grant of the MAC RAR. As an example, the uplink grant may include fields related to CSI reporting, such as CSIrequest. Or the uplink grant may include availability indication information related to the second reference signal.

[0429] In this embodiment of the disclosure, the UE can determine the time-domain resource location and / or frequency-domain resource location of the second reference signal based on the second PDCCH and second PDSCH of the scheduling random access response, wherein the second PDSCH includes the random access response. In other words, the UE determines the time-domain or frequency-domain resource location of the reference signal based on the PDCCH of scheduling Msg2.

[0430] Optionally, there may be a certain relationship between the second reference signal and the second PDCCH, or there may be a certain relationship between the second reference signal and the second PDSCH.

[0431] As an example, the time-domain resource location of the second reference signal can be determined based on at least one of the following:

[0432] (1) Time-domain resources used for the second PDCCH;

[0433] For example, the second reference signal and the second PDCCH occupy the same symbol.

[0434] (2) First offset, which is the offset between the time domain resources occupied by the second reference signal and the time domain resources used for the second PDCCH;

[0435] For example, there is a time-domain offset between the second reference signal and the second PDCCH, and the time-domain resource position of the second reference signal is determined based on the time-domain resources used for the second PDCCH and the first offset.

[0436] (3) Time-domain resources used for the second PDSCH;

[0437] For example, the second reference signal and the second PDSCH occupy the same symbol.

[0438] (4) Second offset, which is the offset between the time-domain resources occupied by the second reference signal and the time-domain resources used for the second PDSCH. The second time-domain offset is predefined by the protocol or determined based on the second PDCCH or the second PDSCH.

[0439] For example, there is a time-domain offset between the second reference signal and the second PDSCH, and the time-domain resource position of the second reference signal is determined based on the time-domain resources used for the second PDSCH and the second offset.

[0440] In this embodiment of the disclosure, the third configuration information may further include the content or parameters indicating the CSI to be reported. For example, 1 bit may be used to indicate that the UE reports Channel Quality Indicator (CQI) or RSRP. Another example is that 1 bit may be used to indicate that the UE reports subband CQI or wideband CQI in the existing mechanism, or it may be assumed that the UE reports wideband CQI in the existing mechanism by default, and 1 bit may be used to indicate whether the UE additionally reports CQI reflecting transmission over a narrowband (and the frequency domain location of that narrowband).

[0441] Furthermore, the third configuration information may be an indication of a predefined CSI reporting mode, such as indicating CQI reporting mode Mode 1-0, Mode 1-1, Mode 2-0, etc.

[0442] Furthermore, the third configuration information instructs the UE to report the CSI of the first downlink frequency domain resource group, or the CSI of the second downlink frequency domain resource group, or information related to the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group.

[0443] Optionally, if the third configuration information does not include the content or parameters of the reported CSI, the UE may report the content or parameters of a predefined CSI.

[0444] In this embodiment of the disclosure, the third configuration information may include at least one of the following: resource information for CSI measurement (e.g., information on CSI reference resources), resource repetition count for CSI measurement, filter parameters for CSI measurement, CSI measurement period, CSI reporting trigger condition, CSI indication range, random access channel resources for instructing the UE to perform CSI reporting capability, and time-frequency resources for CSI reporting.

[0445] The resource information used for CSI measurements includes physical time-frequency resource information (e.g., time-domain and frequency-domain locations of PRBs or PRB groups) or pilot resource information (e.g., NRS (Narrowband Reference Signal), CSI-RS, CRS (Cell Reference Signal), DMRS (Demodulation Reference Signal), etc.) or physical channels (e.g., PDSCH, PDCCH, PBCH, etc.) used for CSI measurements.

[0446] Optionally, the physical time-frequency resource information used for CSI measurement includes the physical time-frequency resource location information of the pilot (or reference signal) resources used for CSI measurement (e.g., carrier position and / or subframe position used for CSI measurement). The resource repetition count used for CSI measurement can be the maximum repetition count information (Rmax) indicated in the system information and / or in the configuration information of the search space (Type-2 Common Search Space, Type-2CSS) used by the random access response. Further, the resource repetition count used for CSI measurement can be the minimum of a predefined repetition count and the repetition count used for CSI measurement indicated by the base station (e.g., Rmax or RCSI configured in the SIB): RCSI′ = min(predefined repetition count, configured repetition count). Alternatively, the resource repetition count used for CSI measurement can be selected by the UE from a predefined repetition count and the repetition count used for CSI measurement indicated by the base station.

[0447] In this embodiment of the disclosure, the PUSCH in step S505 may include Msg3 in the four-step random access process. For ease of description, it may be referred to as the PUSCH corresponding to Msg3 below, that is, the PUSCH used to carry Msg3. CSI reporting can be performed in contention-based random access processes and / or non-contention-based random access processes. Optionally, CSI reporting can be performed before the RRC connection is established.

[0448] In one optional implementation, the RRC message in Msg3 includes a CSI report. As an example, the UE receives information related to CSI reporting and reports a CSI report based on this information. Specifically, the UE can map the CSI to an RRC message and report a CSI report related to the second downlink frequency domain resource group in the RRC message in Msg3. For example, Msg3 includes an RRC message UL-CCCH (Common Control Channel)-Message or UL-CCCH1-Message, which includes messages related to the RRC connection. The RRC message can be at least one of the following: RRC connection request message (RRCSetupRequest), RRC connection recovery request message (RRCResumeRequest), RRC connection re-establishment request message (RRCReestablishmentRequest), and RRC system information request message (RRCSystemInfoRequest). The UE reports information related to the CSI report in at least one of these messages. In one example, the RRC connection request message includes information elements related to the CSI report.

[0449] In another optional implementation, the second MAC CE or MAC subheader of Msg3 includes a CSI report. As an example, the UE receives information related to CSI reporting and reports a CSI report based on this information. Specifically, the UE can map the CSI to the MAC subheader (or subheader) corresponding to the CCCH in Msg3, or to padding fields or additional MAC subheaders in the MAC header (or header) of Msg3, or to the MAC CE (or a new MAC CE), and report the CSI report related to the second downlink frequency domain resource group in the second MAC CE or MAC subheader of msg3.

[0450] Optionally, the second MAC CE can be an existing MAC CE or a new MAC CE. As an example, a CSI report can be submitted via bits in the subheader of an existing MAC CE or via a new MAC CE.

[0451] Optionally, the second MAC CE corresponding to the CSI report is identified by a specific LCID (Logical Channel Identifier), and the second MAC CE corresponding to the CSI report has a specific priority.

[0452] Optionally, the second MAC CE or MAC sub-header includes at least one of the following information: CQI, PMI, RI, frequency domain resource group number, BWP number, CSI resource index number, CSI reporting index number, CSI type, MAC CE length, etc. The MAC CE length is related to the CSI type.

[0453] In one example, one way to define the second MAC CE is as follows: Figure 9 As shown, it includes the RI field, the CQI field, and the R field representing reserved bits.

[0454] Optionally, the second MAC CE may include at least one of the following fields:

[0455] (1) Fields indicating CQI;

[0456] (2) Fields indicating PMI;

[0457] (3) Fields indicating RI;

[0458] (4) A field indicating the carrier (frequency domain resource group) number;

[0459] (5) A field indicating the BWP number;

[0460] (6) A field indicating the index number of the corresponding configured CSI resource to be reported by CSI;

[0461] (7) Instructs the CSI to report the corresponding configured index number field;

[0462] (8) A field indicating the CSI type, for example, a field value of 0 indicates reporting wideband CSI, and a field value of 1 indicates reporting narrowband CSI. Optionally, when reporting wideband CSI, the second MAC CE includes a field indicating CSI, and when reporting narrowband CSI, the second MAC CE includes at least one field indicating CSI. In this embodiment of the present disclosure, wideband CSI can be understood as CSI corresponding to a carrier or BWP, and narrowband CSI can be understood as CSI corresponding to a subband in a carrier or BWP; or, wideband CSI can be understood as CSI corresponding to multiple carriers, and narrowband CSI can be understood as CSI corresponding to a single carrier;

[0463] (9) A field indicating the length of the MAC CE, wherein the length of the MAC CE is related to the type of CSI. For example, the MAC CE length corresponding to a wideband CSI is N bits, and the MAC CE length corresponding to a narrowband CSI is P*N bits, where P is the number of carriers.

[0464] In another alternative implementation, the CSI report is multiplexed with uplink data on the PUSCH. For example, the CSI report is multiplexed on the PUSCH corresponding to Msg3 in the form of UCI (Uplink Control Information). For PUSCHs scheduled by RAR uplink grant (UL grant), when the UE is configured to allow UCI multiplexing on PUSCHs scheduled by RAR uplink grant, the UE multiplexes the CSI report on the PUSCH corresponding to Msg3.

[0465] In another alternative implementation, the CSI report is mapped onto the uplink data channel (such as PUSCH) using a piggyback method. Optionally, instead of being placed in the Msg3 message, the CSI is reported through the physical layer. Further, for PUSCH and / or CSI transmissions that require repetition (more than or equal to 1 repetition), the CSI is repeated the same number of times as the Transport Block (TB) carried on the PUSCH, or the repetition count of the CSI is configured via RRC and transmitted piggyback on the PUSCH.

[0466] In this embodiment of the disclosure, when the CSI report is mapped onto the PUSCH using a carrying method, the uplink data channel carrying the CSI can be transmitted according to predefined rules. Optionally, mapping the CSI onto the uplink data channel according to predefined rules includes: if the PUSCH is also used to transmit ACK (ACK knowledge character) information or NACK (Negative ACK knowledge) information, mapping the ACK information or NACK information onto the frequency domain resource unit closest to the reference signal of the PUSCH, replacing part of the coded and modulated uplink data channel data information with the CSI report, and sequentially mapping it onto frequency domain resource units not occupied by ACK information, NACK information, and the second reference signal. For example, if ACK / NACK information needs to be transmitted simultaneously, the ACK / NACK information is first mapped to the resource element (RE) closest to the reference signal (RS). Then, the coded and modulated part of the uplink data channel information is replaced with CSI and mapped sequentially to REs that are not occupied by ACK / NACK information or RS. Otherwise, the coded and modulated part of the uplink data channel information is replaced with CSI and mapped sequentially to REs that are not occupied by ACK / NACK information or RS.

[0467] Furthermore, mapping CSI onto the uplink data channel according to predefined rules also includes: mapping and / or repeating CSI and / or ACK / NACK information on the uplink data channel on a per-transmission-block basis, or mapping and / or repeating on a per-resource-unit basis.

[0468] In this embodiment of the disclosure, the time domain resources of the PUSCH are determined based on a third offset and a first value. The third offset is the offset between the time domain resource unit where the uplink grant is located and the time domain resource unit where the PUSCH is located, and the first value is related to the CSI report.

[0469] Optionally, the temporal resources of PUSCH are determined based on the sum of a third offset and a first value.

[0470] In one example, when the UE is scheduled to transmit transport blocks via RAR uplink grant or fallback RAR uplink grant, and there is a CSI report, the PUSCH time resource allocation field value m of the RAR uplink grant or fallback RAR uplink grant provides a row index m+1 to the time domain resource allocation table. The index row defines the slot offset K2, the Start and Length Indicator Value (SLIV), or directly defines the start symbol S and allocation length L, the PUSCH mapping type, the number of slots used for TBS (Transport Block Size) determination (if numberOfSlotsTBoMS (number of slots for multi-slot transport blocks) exists in the time domain resource allocation table), and the number of repetitions to be applied in the PUSCH transmission (if numberOfRepetitions (number of repetitions) exists in the time domain resource allocation table).

[0471] When a UE is configured to send CSI reports on the PUSCH scheduled under a RAR uplink grant or a fallback RAR uplink grant, in addition to the K2 value, a ΔK2 value related to the CSI report will also be applied. Here, K2 represents the offset between the time-domain resource element (e.g., time slot) where the RAR uplink grant or fallback RAR uplink grant is located and the time-domain resource element (e.g., time slot) where the PUSCH is located. Optionally, the offset between the time-domain resource element (e.g., time slot) where the RAR uplink grant or fallback RAR uplink grant is located and the time-domain resource element (e.g., time slot) where the PUSCH is located is K2 + ΔK2. Optionally, ΔK2 can also be related to the subcarrier spacing of the PUSCH, such as... Figure 10 As shown, Figure 10 N0 to N6 can be values ​​predefined by the protocol.

[0472] In this embodiment of the disclosure, CSI further includes at least one of the following: CSI transmitted on all frequency domain resources in the CSI reference resource; CSI transmitted on a selected frequency domain resource (which may be an absolute value or the difference from a reference CSI, for example, the difference between the CSI transmitted on the selected frequency domain resource and the reference CSI when the CSI transmitted on the CSI reference resource is the reference CSI); and the frequency domain location of the selected frequency domain resource. The CSI reference resource is the frequency domain resource used for CSI measurement received by the UE from the base station via RRC signaling, and / or the CSI reference resource defined in existing mechanisms, and / or predefined frequency domain resources, and / or frequency domain resources determined by the UE itself (e.g., all frequency domain resources of the downlink control channel monitored by the UE).

[0473] The selected frequency domain resources are either preferred resources chosen by the UE from all monitored frequency domain resources or from all frequency domain resources in the CSI reference resources based on channel quality, or frequency domain resources configured by the base station through RRC signaling. The frequency domain location of the selected frequency domain resources is either an absolute frequency domain location (e.g., an index of a frequency domain resource group / carrier / partial bandwidth / subcarrier / PRB / RE) or a relative position of the selected frequency domain resources within all CSI reference resources.

[0474] Optionally, the CSI report may include one of the following: CSI related to the first frequency domain resource group, CSI related to the second frequency domain resource group, and indication information related to both the CSI of the first frequency domain resource group and the CSI of the second frequency domain resource group.

[0475] Optionally, the CSI report may include CSI measurement results for at least one second downlink frequency domain resource group, such as the CQI index.

[0476] Optionally, the CSI report may include the minimum value of CSI measurement results (e.g., CQI index) from multiple downlink frequency domain resource groups.

[0477] Optionally, the CSI report may include the maximum value from CSI measurement results (e.g., CQIindex) of multiple downlink frequency domain resource groups.

[0478] The multiple downlink frequency domain resource groups can be all configured downlink frequency domain resource groups (including a first downlink frequency domain resource group and at least one second downlink frequency domain resource group), or all or part of the downlink frequency domain resource groups determined based on an indication from the configured downlink frequency domain resource groups.

[0479] Optionally, the CSI report may include an index of downlink frequency domain resource groups whose CSI measurement results are greater than a first threshold, such as an index of one or more downlink frequency domain resource groups, wherein the channel state information measurement results of one or more downlink frequency domain resource groups are greater than the first threshold, which may be a value predefined by the protocol or a value configured by higher-layer parameters / higher-layer signaling.

[0480] Optionally, the CSI report may include the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group, or the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group, or the level of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group, or the level of the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group. For example, the mapping between different CSI values ​​and offsets may be as shown in Tables 1 and 2, where the offset may refer to the difference between the CSI measurement results of the first frequency domain resource group and the CSI measurement results of the second frequency domain resource group, or the absolute value of the difference; the thresholds X, X1, X2, and X3 in the tables may be predefined values ​​of the protocol or values ​​configured by higher-layer parameters / higher-layer signaling. In one example, X is the minimum bit rate in the CQI table that satisfies PDSCH to achieve 10% BLER (Block Error Rate).

[0481] CSI value offset 0 ≤X 1 ≥X

[0482] Table 1

[0483] CSI value offset 00 ≤X1 01 ≥X1 and <X2 10 ≥X2 and <X3 11 ≥X3

[0484] Table 2

[0485] Optionally, the CSI report may include the UE's ability to measure the second downlink frequency domain resource group, and the difference between the CSI measurement results of the second frequency domain resource group and the CSI measurement results of the first frequency domain resource group, or a combination of the absolute values ​​of the differences, for example, as shown in Table 3, where X4, X5, and X6 may be predefined values ​​of the protocol or values ​​configured by higher layers.

[0486]

[0487]

[0488] Table 3

[0489] Optionally, the CSI report may include the UE's ability to measure the second downlink frequency domain resource group. For example, it may indicate whether the measurement is obtained from a single downlink frequency domain resource group or from multiple downlink frequency domain resource groups (equivalent to reporting the UE's measurement capability). Further optionally, it may also include at least one CSI measurement result, as shown in Table 4. X7 can be predefined by the protocol or configured by a higher layer, or it can be information calculated and reported by the UE. In one example, each row in Table 4 implicitly corresponds to a different UE capability. For example, index 00 indicates that the UE can only measure the first frequency domain resource group; index 01 indicates that the UE cannot simultaneously measure the second and first frequency domain resource groups; index 10 indicates that the UE can use one RF front-end to receive the first and second frequency domain resource groups; and index 11 indicates that the UE uses different RF front-ends to receive the first and second frequency domain resource groups.

[0490]

[0491] Table 4

[0492] Optionally, the CSI report may include channel state information for each downlink frequency domain resource group, such as the CQI for each downlink frequency domain resource group (e.g., a 4-bit indicator of the CQI for each downlink frequency domain resource group); or, for example, each downlink frequency domain resource group may correspond to a bit indicating whether the CSI meets a certain condition, such as the relationship between the CSI measurement result of at least one downlink frequency domain resource group and a second threshold; wherein, at least one downlink frequency domain resource group may be all configured downlink frequency domain resource groups (including a first downlink frequency domain resource group and at least one second downlink frequency domain resource group), or it may be all or part of the downlink frequency domain resource groups determined based on the indication from the configured downlink frequency domain resource groups. For example, when the number of downlink frequency domain resource groups is 2, an example is shown in Table 5, where the second threshold X8 may be a value predefined by the protocol or a value configured by higher-layer parameters / higher-layer signaling.

[0493] index Report 00 Out of range 01 The first frequency-domain resource group <X8 & the second frequency-domain resource group ≥ X8 10 First frequency domain resource group ≥ X8 & Second frequency domain resource group <X8 11 First frequency domain resource group ≥ X8 & Second frequency domain resource group ≥ X8

[0494] Table 5

[0495] Optionally, the CSI report may include the association between the antenna ports of the UE's first downlink frequency domain resource group and the antenna ports of the second downlink frequency domain resource group, as shown in Table 6.

[0496]

[0497] Table 6

[0498] Optionally, the CSI report may include information related to the quasi-co-address QCL relationship between the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group, as shown in Table 7.

[0499]

[0500] Table 7

[0501] Optionally, the CSI report may include information related to the MCS (modulation coding scheme) table used for decoding the PDSCH.

[0502] Optionally, the CSI report may include the CSIs of the N frequency domain resource groups with the largest (or smallest) CSI values ​​among all frequency domain resource groups.

[0503] Optionally, the RSRQ, RSRP, RS-SINR, RSSI values, etc. reported in Msg3 are the results after L3-filtering.

[0504] Optionally, the CSI report may include quantitative results of the CSI.

[0505] In this embodiment of the disclosure, the CSI report is obtained based on a second reference signal on a second downlink frequency domain resource group (representing a reference signal / physical signal / physical channel, etc., used for measurement on the second downlink frequency domain resource group). Optionally, a first reference signal is used to represent the reference signal / physical signal / physical channel used for measurement on the first downlink frequency domain resource group.

[0506] Optionally, the second reference signal may be a specific reference signal, such as a signal used for channel state measurement of the second downlink frequency domain resource group.

[0507] Optionally, the second reference signal includes at least one of the following: primary synchronization signal, secondary synchronization signal, primary and secondary synchronization signals, NCD-SSB (Non-Cell Defining SSB), TRS, CSI-RS, and DMRS.

[0508] Optionally, the second reference signal may include at least one of the following:

[0509] (1) Information related to the first reference signal, including at least one of the following:

[0510] 1. The first frequency band where the first reference signal is located;

[0511] 2. The ARFCN (Absolute Radio Frequency Channel Number) where the first reference signal is located;

[0512] 3. The offset between the ARFCN where the first reference signal is located and the ARFCN with the lowest frequency in the first downlink frequency domain resource group; 4. The GSCN (Global Synchronization Channel Number) where the first reference signal is located;

[0513] 5. The offset between the GSCN containing the first reference signal and the GSCN with the lowest frequency in the first downlink frequency domain resource group;

[0514] 6. The offset between the ARFCN corresponding to the first reference signal and the ARFCN corresponding to the second reference signal;

[0515] 7. The offset between the GSCN corresponding to the first reference signal and the GSCN corresponding to the second reference signal.

[0516] (2) Reference signal type.

[0517] 1. The first type of reference signal can be a first reference signal used by the UE to perform cell search. The UE can determine the time domain location and / or frequency domain location of system information (or, remaining system information) based on the first type of reference signal.

[0518] 2. The second type of reference signal can be a second reference signal. After the UE finds the second reference signal, it can determine the time domain position and / or frequency domain position of the first reference signal based on the second reference signal.

[0519] Optionally, the aforementioned second reference information can be applied when the second reference signal is received before the first reference information corresponding to the first downlink frequency domain resource group.

[0520] In this embodiment of the disclosure, the UE receives system information and obtains second configuration information related to the second reference signal based on the system information. For example, the UE receives SIB1, wherein SIB1 includes the second configuration information related to the second reference signal. As another example, the UE receives SIB1, wherein SIB1 indicates the existence of SIBx, the UE receives SIBx, and determines the second configuration information related to the second reference signal based on SIBx, where x is a positive integer greater than one.

[0521] In this embodiment, the system information includes second configuration information related to the second reference signal. The second configuration information includes configuration information corresponding to at least one set of reference signals. The UE activates one or more sets of reference signals via a preamble. The advantage of this UE-requested activation of the reference signal is that when the UE does not send an activation request (such as a preamble), the base station can avoid sending the second reference signal, thus saving energy and allocating the corresponding time-domain / frequency-domain resources for data transmission to other UEs, improving spectral efficiency. The base station only sends the second reference signal when the UE sends an activation request (such as a preamble). This design ensures that the UE can perform measurement and reporting based on the second downlink frequency domain resource group, while also considering energy saving on the network side.

[0522] Optionally, the UE sends a preamble, which is associated with whether the UE is configured to report CSI, and / or the preamble is associated with at least one set of CSI reports, and / or the preamble is associated with a second reference signal.

[0523] In this embodiment of the disclosure, when the first preamble group is associated with a CSI report, for step S502, if the UE is configured to receive a CSI report, the UE selects the first preamble group and sends a preamble based on the first preamble group. The first preamble group is associated with whether the UE is configured to receive a CSI report, and / or, the first preamble group is associated with at least one set of CSI reports, and / or, the first preamble group is associated with a second reference signal; or, if the UE is not configured to receive a CSI report, the UE selects the second preamble group and sends a preamble based on the second preamble group.

[0524] The first preamble group is pre-configured, or both the first and second preamble groups are pre-configured. Optionally, the first preamble group may include a preamble group associated with the selected SSB. Optionally, the first preamble group may be a first random access preamble group.

[0525] Optionally, a preamble can be randomly selected from the corresponding preamble group with equal probability.

[0526] In this embodiment of the disclosure, if the UE is configured to report CSI and send a preamble, it may include: if a first condition is met, selecting a first preamble group and sending a preamble based on the first preamble group; if the first condition is not met, selecting a second preamble group and sending a preamble based on the second preamble group.

[0527] The first condition can be found in the example given above.

[0528] Optionally, the first condition may also include at least one of the following:

[0529] (1) The potential Msg3 size (the uplink data that can be transmitted plus the MAC sub-header, and the MAC CE when needed) is greater than the third threshold (such as ra-Msg3SizeGroupA, where the value of ra-Msg3SizeGroupA is obtained by the UE based on higher-layer parameters).

[0530] (2) The path loss is less than the seventh threshold (of the serving cell performing the random access procedure) (e.g., PCMAX-ReceivedTargetPower-Msg3-DeltaPreamble-messagePowerOffsetGroupB, where the values ​​of PCMAX, ReceivedTargetPower, Msg3-DeltaPreamble, and messagePowerOffsetGroupB are obtained by the UE based on higher-layer parameters).

[0531] (3) A random access procedure was initiated for the CCCH, and the CCCH SDU size plus the MAC sub-header is greater than the fourth threshold (e.g., ra-Msg3SizeGroupA).

[0532] Optionally, the first condition may also include at least one of the following:

[0533] (1) The potential Msg3 size is greater than the third threshold (e.g., ra-Msg3SizeGroupA; where the value of ra-Msg3SizeGroupA is obtained by the UE based on higher-layer parameters), and the Msg3 includes a CSI report. The potential Msg3 size includes the uplink data available for transmission plus the MAC sub-header, and, if necessary, the MAC CE. Optionally, the MAC CE or MAC sub-header includes a CSI report.

[0534] (2) A random access procedure is initiated for CCCH, the sum of CCCH SDU size and MAC sub-header size is greater than the fourth threshold (e.g., ra-Msg3SizeGroupA), and the MAC sub-header includes a CSI report, or the sum of CCCH SDU size, MAC sub-header size and second MAC CE size is greater than the fifth threshold (e.g., ra-Msg3SizeGroupA), and the second MAC CE includes a CSI report.

[0535] In this embodiment of the disclosure, a UE in an RRC_IDLE (idle) state or an RRC_INACTIVE (inactive) state can provide a set of reference signal timings through higher-layer parameters (e.g., ResourceSetConfig). Optionally, the set of reference signal timings includes one or more reference signal resource sets.

[0536] In this embodiment of the disclosure, the UE receives configuration information associated with one or more reference signal resource sets, wherein each reference signal resource group configured in the reference signal resource set includes M periodic third reference signal resources in N consecutive time slots. Here, N and M are both positive integers greater than or equal to 1. As an example, each reference signal resource group configured in the reference signal resource set includes four periodic NZP (Non-Zero Power) CSI-RS resources in two consecutive time slots, with two periodic NZP CSI-RS resources in each time slot. If the TDD UL DL ConfigurationCommon does not indicate two consecutive time slots as downlink time slots, the UE can configure one or more TRS resource sets, wherein the TRS resource set contains two periodic NZP CSI-RS resources in one time slot. As an example, the UE may be configured with one or more reference signal resource sets, wherein each reference signal resource group configured in the reference signal resource set includes two periodic NZP CSI-RS resources in one time slot, or a TRS resource set including four periodic NSP CSI-RS resources in two consecutive time slots, with two periodic NZP CSI-RS in each time slot.

[0537] In this embodiment of the disclosure, the first indication information mentioned above includes a K-bit bitmap, such as availability indication information used to indicate the active resource set / resource group / resource within one or more reference signal resource sets included in the reference signal timing. Optionally, the availability indication information is a bitmap, wherein each bit is associated with the configuration of a reference signal resource group. Optionally, if higher-level parameters (e.g., ResourceSetConfig) are provided, the DCI format may include a reference signal availability indication field (which can be equivalently replaced by reference signal availability indication information), which provides a bitmap to the reference signal resource set group, wherein the configuration of each reference signal resource set includes an association with the bitmap position.

[0538] Optionally, each bit in the bitmap is associated with reference signal resources for K time-domain resource units. For example, a bit value of "1" in the bitmap indicates the existence of a set of related reference signal resources for K frames. The reference starting time-domain resource unit corresponding to the K time-domain resource units is the time-domain resource unit where the downlink signal carrying the bitmap is located. For example, the reference starting frame corresponding to the K frames can be the frame where the downlink signal carrying the bitmap is located, or it can be a frame determined according to predefined rules in the protocol. Alternatively, the reference starting frame can be the SFN (system frame number) determined according to (SFN+PF_offset)modT=0, where the value of PF_offset is determined based on higher-layer parameters, and the value of T can be related to the default paging cycle. The reference starting frame corresponding to the K frames can also be the time-domain resource unit where the lowest index SSB in the current SSB cycle is located, for example, the frame where the lowest index SSB in the current SSB cycle is located. Optionally, a bit value of "0" in the bitmap indicates that the current assumption of the availability or unavailability of the related reference signal resource set remains unchanged.

[0539] In this embodiment of the disclosure, the value of K can be predefined by the protocol, determined based on higher-layer parameters, or determined through the DCI format. For example, the value of K can be determined based on the DCI format provided by the second PDCCH. As an example, the UE can be configured with the parameter validityDuration, then the value of K can be the product of the validityDuration value and a configured period (e.g., defaultPagingCycle). As another example, if validityDuration is not provided, then the value of K is the product of T and a configured period, where T is a predefined value by the protocol or a value determined based on the DCI format.

[0540] In this embodiment of the disclosure, the DCI format may include a field indicating the activation duration of the reference signal resource set. For example, the DCI format provided by the second PDCCH includes the activation duration of the reference signal resource set. As an example, the possible values ​​of this field are n2, n4, n8, and n16, corresponding to bit sequences of 00, 01, 10, and 11, respectively. These four values ​​represent activation durations of 2 frames, 4 frames, 8 frames, and 16 frames for the reference signal resource set. As another example, the possible values ​​of this field are 1, 2, 3, and 4, corresponding to bit sequences of 00, 01, 10, and 11, respectively. These four values ​​represent activation durations of 1 cycle, 2 cycles, 3 cycles, and 4 cycles for the reference signal resource set. Here, the cycle can be the SSB cycle or a cycle related to paging, such as the defaultPagingCycle.

[0541] In this embodiment of the disclosure, when the UE is configured with CSIrequest-rach (CSI Request Random Access Channel), the UE can receive reference signal timings outside of the initial downlink BWP. CSIrequest-rach instructs the UE to report a CSI report related to the second downlink frequency domain resource group during the initial access process. In other words, if the UE is configured to send a CSI report during the initial access process, one or more reference signal timings configured in the second configuration information include reference signal timings outside of the initial downlink BWP. When the UE is not configured with CSIrequest-rach, the UE does not need to receive reference signal timings outside of the initial downlink BWP. In other words, if the UE is not configured to send a CSI report during the initial access process, or if the UE is not configured to include a CSI report in Msg3, or if the UE is not configured to send a CSI report on the PUSCH corresponding to Msg3, the UE does not receive reference signal timings outside of the initial downlink BWP.

[0542] In this embodiment of the disclosure, the reference signal timings configured in the second configuration information include reference signal timings for a third frequency domain resource group. The third frequency domain resource group can be a first downlink frequency domain resource group or a second downlink frequency domain resource group, or it can be the initial downlink BWP in the first downlink frequency domain resource group, or the initial downlink BWP in the second downlink frequency domain resource group. Optionally, the UE listens to the PDCCH of the scheduled RAR in the third frequency domain resource group.

[0543] In this embodiment of the disclosure, the UE receives configuration information (such as second configuration information) related to one or more reference signal resource sets, wherein the configuration information includes at least one of the following:

[0544] (1) Parameters related to the validity period of the second reference signal, such as the validity duration of the L1 (Layer 1) availability indicator. Optionally, the time unit of the validity duration is one default paging cycle. When the field is not present, the UE assumes that the default duration is T1 default paging cycles. Optionally, this information is only valid when the UE has a valid SIBx, wherein the SIBx contains the second reference signal resources and related configuration information.

[0545] (2) Parameters related to the type of reference signal, such as:

[0546] 1. The second reference signal is indicated to be a Type A reference signal, wherein the Type A reference signal includes a signal for CSI measurement and a downlink signal for synchronization. Optionally, the Type A reference signal may be a non-cell-defined SSB. Optionally, the Type A reference signal may include a secondary synchronization signal and a TRS. Optionally, the Type A reference signal may include a primary synchronization signal, a secondary synchronization signal, and a TRS;

[0547] 2. The second reference signal is indicated to be a Type B type reference signal, wherein the Type B type reference signal includes a signal used for CSI measurement. Optionally, the Type B type reference signal may include a TRS.

[0548] (3) Parameters related to the time-domain location of the reference signal, such as the index of the first OFDM symbol used to transmit the reference signal in the time slot where the reference signal is located. Optionally, this parameter indicates the first symbol in the time slot of the first reference signal resource in the time slot, and the index of the symbol and a protocol-predefined offset can be used to determine the index of the N5th OFDM symbol, where N5 is a positive integer greater than or equal to 2.

[0549] (4) A parameter related to the frequency domain position of the reference signal, which can indicate one of the following:

[0550] 1. The offset from the first RE (where the reference signal is located) to RE#0 in RB;

[0551] 2. The offset between the PRB index at the beginning of the corresponding reference signal resource and the common resource block #0 (CRB#0) on the common resource block grid;

[0552] 3. The offset between the PRB index of the starting reference signal resource and the lowest index resource block of the carrier where the reference signal is located on the common resource block grid. For example, the frequency domain position of the second reference information can be determined based on the fourth offset in the second configuration information. The fourth offset is the offset between the PRB index of the starting frequency domain position of the second reference information and the lowest index resource block of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0553] 4. The offset between the PRB index of the starting reference signal resource and the lowest index resource block of the initial BWP (or default BWP) of the carrier where the reference signal is located on the common resource block grid. For example, the frequency domain position of the second reference information can be determined based on the fifth offset in the second configuration information. The fifth offset is the offset between the physical resource block PRB index of the starting frequency domain position of the second reference information and the lowest index resource block of the initial BWP or default BWP of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0554] 5. The offset between the PRB index of the corresponding reference signal resource and the center frequency point (or the resource block corresponding to the center frequency point) of the carrier where the reference signal is located on the common resource block grid. For example, the frequency domain position of the second reference information can be determined based on the sixth offset in the second configuration information. The sixth offset is the offset between the physical resource block PRB index of the starting frequency domain position of the second reference information and the center frequency point of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0555] 6. Frequency domain density of the reference signal. The physical meaning of frequency domain density can be: the number of REs occupied by the reference signal in each RB on average in a segment of frequency domain resources.

[0556] (5) A parameter related to the period of the reference signal, which may include at least one of the following:

[0557] 1. The periodicity and time slot offset (time slot) of the periodic reference signal are used to determine the position of the first time slot in the reference signal resource set;

[0558] 2. The absolute time corresponding to the period of the reference signal can be in units of at least one of the following:

[0559] 1) Frame;

[0560] 2) Half frame;

[0561] 3) Time slot;

[0562] 4) Half a time slot;

[0563] 5) Symbols;

[0564] 6) N6 symbols, where N6 is an integer between 1 and 14;

[0565] 3. The relationship between the period of the reference signal and any of the following, for example, a multiple relationship:

[0566] 1) SSB cycle;

[0567] 2) DRX (Discontinuous Reception) cycle (short cycle);

[0568] 3) Paging period;

[0569] 4) The period corresponding to the TDD-DL-UL pattern (uplink / downlink configuration period);

[0570] 5) RO cycle;

[0571] 6) A combination of one or more of the above, such as the minimum (or maximum) value between the SSB period and the paging period;

[0572] In other words, the period of the second reference signal is determined based on at least one of the following information in the second configuration information: its relationship with the SSB period; its relationship with the discontinuous reception DRX period; its relationship with the paging period; its relationship with the uplink / downlink configuration period; and its relationship with the timing of random access transmission.

[0573] (6) Parameters related to the quasi-co-addressing of the reference signal, which may include at least one of the following:

[0574] 1. Provides an index of reference SSBs for quasi-co-address information;

[0575] 2. Provides an index of the CSI-RS for quasi-co-location information.

[0576] (7) A parameter related to the power of the reference signal, which may represent at least one of the following:

[0577] 1. Absolute power of the reference signal;

[0578] 2. The power difference between the reference signal and the SSS RE;

[0579] 3. The power difference between the reference signal and the CSI-RS RE, where the CSI-RS can be an NZP CSI-RS;

[0580] 4. Power difference between the reference signal and the TRS RE;

[0581] (8) Parameters related to the sequence of the reference signal, such as the scrambling sequence of the reference signal.

[0582] In this embodiment of the disclosure, the resources used for measuring the reference signal may include at least one of the following: a first frequency domain resource group, a narrowband, PRB, carrier, or BWP for receiving the PDCCH of the RAR, a narrowband, PRB, carrier, or BWP for receiving the PDSCH of the RAR, a narrowband, PRB, carrier, or BWP for listening to paging, frequency domain resources indicated in the configuration information configured by the base station for CSI reporting, frequency domain resources indicated by the base station in the RAR, predefined resources for measuring CSI, etc. Wherein, any of the above PRBs or carriers may be sub-PRBs, subcarriers, or subbands. Further, if frequency hopping of the channel or frequency domain resource corresponding to the resources used for measuring CSI is enabled, the resources used for measuring CSI further include all narrowbands or (sub)PRBs or (sub)carriers or BWPs or subbands used for frequency hopping.

[0583] Furthermore, if the frequency domain resources used for measuring CSI include a second frequency domain resource group, when the UE measures CSI on the second frequency domain resource group used for measuring CSI, it includes at least one of the following: measuring reference signals periodically transmitted on the second frequency domain resource group; measuring reference signals on the search space used for listening to RAR (e.g., Type-2 Common Search Space) from N1 subframes before the start to N2 subframes after the end; and measuring reference signals on the search space used for listening to paging and / or wake-up signals from N3 subframes before the start to N4 subframes after the end.

[0584] Furthermore, if the resources used to measure CSI do not include any frequency domain resources, such as when the resources used to measure CSI are empty, the UE will not report CSI.

[0585] It should be noted that the UE's determination of the resources used for CSI measurement and the UE's triggering of CSI reporting do not have an absolute temporal order. In one example, the UE determines the resources used for CSI measurement based on the configuration information used to indicate CSI reporting, and then is triggered to report CSI by the information indicated in the RAR. In another example, the UE is triggered to report CSI by the information indicated in the RAR, and then determines the resources used for CSI measurement based on both the configuration information used to indicate CSI reporting and the information indicated in the RAR.

[0586] In this embodiment of the disclosure, the UE determines the resources for measuring CSI based on at least one of the following: predefined criteria, the UE's ability to measure and report CSI after transmitting RACH, the configuration information configured by the base station for CSI reporting, and the information indicated by the base station in the Random Access Response (RAR). If the UE has the ability to measure and report CSI after transmitting RACH, and the frequency domain resources of the PDCCH of Msg3 / 4 are indicated in the RAR received by the UE (e.g., the RAR includes the narrowband index field of the PDCCH of Msg3 / 4), the resources for measuring CSI include at least one of the following based on the predefined criteria and / or the information indicated in the RAR: the narrowband or PRB or carrier or BWP where the PDCCH of Msg3 / 4 is located as indicated in the RAR; the narrowband or PRB or carrier or BWP where the PDCCH for receiving the RAR is located; the narrowband or PRB or carrier or BWP where the PDSCH for receiving the RAR is located; and the frequency domain resources in the configuration information configured by the base station for CSI reporting. Otherwise, if the frequency domain resources of the PDCCH of Msg3 / 4 are not indicated in the RAR received by the UE (e.g., the narrowband index field of Msg3 / 4MPDCCH is not included in the RAR), the resources used to measure CSI include at least one of the following: the narrowband or PRB or carrier or BWP in which the PDCCH of the RAR is received, the narrowband or PRB or carrier or BWP in which the PDSCH of the RAR is received, and the frequency domain resources in the configuration information configured by the base station for CSI reporting.

[0587] The method provided in this embodiment may further include step S509: listening to a third PDCCH, wherein the third PDCCH includes indication information related to MCS, and the indication information related to MCS is used to indicate one of a plurality of MCS tables;

[0588] Step S510 may specifically include: receiving a third PDSCH, wherein the MCS of the third PDSCH is determined based on the third PDCCH and channel state information.

[0589] Optionally, step S509 is based on Msg4 received during the four-step random access process.

[0590] Optionally, the MCS used for decoding the third PDSCH is determined based on the CSI report.

[0591] Optionally, after the UE sends Msg3, it listens to the third PDCCH, which includes a field indicating the MCS table. The UE determines the MCS table used to decode the third PDCCH based on the field.

[0592] Optionally, the DCI format 1_0 scrambled with TC-RNTI (Temporary Cell-RNTI) using Cyclic Redundancy Check (CRC) includes a field indicating the MCS table. The UE should use I MCS The MCS table determines the modulation order and target code rate for the third PDSCH, where I MCS This represents the MCS index. Optionally, the MCS index is determined based on a third PDCCH, for example, the PDCCH includes a field indicating the MCS index.

[0593] Optionally, the field of the MCS table is indicated to occupy one bit. When the field value is 0, the UE uses table 1, and when the field value is 1, the UE uses table 2.

[0594] Optionally, the field of the MCS table occupies two bits. When the field value is 00, the UE uses table 1; when the field value is 01, the UE uses table 2; when the field value is 10, the UE uses table 3; and when the field value is 11, it indicates that it is reserved.

[0595] In this embodiment of the disclosure, the method of determining the MCS table through PDCCH allows the UE to use a higher or lower modulation order and target code rate according to the system scheduling, thereby enhancing the flexibility of the system.

[0596] Optionally, the third PDCCH received by the UE is the PDCCH sent by the base station after receiving the CSI report. The MCS table indicated in the third PDCCH can be better adapted to the downlink channel of the UE. When the UE has a better channel state, the UE will use a table containing a higher modulation order according to the third PDCCH, thereby improving spectral efficiency. For example, the third PDCCH indicates the use of Table 9 below. When the UE has a worse channel state, the UE will select a table containing a lower spectral efficiency according to the third PDCCH, thereby improving the reliability of information transmission. For example, the third PDCCH indicates the use of Table 10 below.

[0597] Below are examples of several MCS tables:

[0598]

[0599]

[0600] Table 8 - MCS Index Table 1

[0601]

[0602]

[0603] Table 9 - MCS Index Table 2

[0604]

[0605]

[0606]

[0607] Table 10 - MCS Index Table 3

[0608] The method provided in this disclosure can be used for Small Data Transmission (SDT). SDT is a process that allows data and / or signaling transmission while remaining in the RRC_INACTIVE state (i.e., without transitioning to the RRC_CONNECTED state).

[0609] Optionally, SDT is enabled on a radio bearer basis and can be initiated by the UE in the case of MO-SDT (Mobile Initiated SDT) or by the network in the case of MT-SDT (Mobile Terminated SDT).

[0610] The network can enable MO-SDT, MT-SDT, or both in a cell. Optionally, the UE will only initiate MO-SDT if less than or equal to the configured amount of UL data is waiting to be transmitted on all radio bearers configured for SDT, the DL RSRP is higher than the configured threshold, and valid SDT resources are available. Optionally, when DL data is waiting to be transmitted on radio bearers configured for SDT, MT-SDT is initiated by the network and indicated to the UE in a paging message; based on this indication, the UE will only initiate MT-SDT if the DL RSRP is higher than the configured threshold specified in the protocol. When the UE initiates MT-SDT, the reason for MT-SDT recovery is included in RCResumeRequest or RCResumeRequest1. The maximum duration for which an SDT procedure can continue is determined by the SDT fault detection timer configured by the network.

[0611] Optionally, the SDT procedure is initiated via transport on RACH (configured via system information) or Type 1 CG (Configured Grant) resources (configured via dedicated signaling in RRCrease). SDT resources can be configured on the initial BWP of RACH and CG. RACH and CG resources for SDT can be configured on either or both of the NUL and SUL carriers. When an RRCrease with a suspension indication is received, the CG resources for SDT are only valid within the UE's PCell (Primary Cell). CG resources are associated with one or more SSBs. For RACH, the network can configure 2-step and / or 4-step RA (Random Access) resources for MO-SDT. When 2-step and 4-step RA resources for MO-SDT are configured, the UE selects the RA type according to rules predefined in the protocol. If the MT-SDT procedure is initiated via RACH, the UE can only use RACH resources not configured for SDT. CFRA is not supported for SDT on RACH.

[0612] In this embodiment of the disclosure, when the UE is configured to send a CSI report during random access, for the RA-SDT procedure, the UE sends a PUSCH after receiving the RAR, wherein the PUSCH contains the CSI report. When the UE is configured to send a CSI report during random access, for the RA-SDT procedure, when the UE uses a two-step RA, the UE sends MsgA, wherein MsgA contains the CSI report.

[0613] In this embodiment of the disclosure, for the CG-SDT procedure, the UE sends a CSI report on the first CG PUSCH. For example, the UE receives a paging message containing an MT-SDT indication, and the paging-related information (e.g., a PDCCH scrambled by P-RNTI, a PDSCH carrying paging information) contains information instructing the UE to report a CSI report; then the UE sends a CSI report on the first CG PUSCH.

[0614] In this embodiment of the disclosure, the first configuration information includes information related to the first bandwidth of the first downlink (or uplink) frequency domain resource group, and information related to available frequency domain resource units outside the first bandwidth.

[0615] Optionally, the first configuration information includes fourth configuration information related to the first downlink (or uplink, hereinafter illustrated as an example) frequency domain resource group, and the fourth configuration information includes fifth configuration information related to the second downlink frequency domain resource group, whereby the second downlink frequency domain resource group is an available frequency domain resource element outside the first downlink frequency domain resource group. Optionally, the second downlink frequency domain resource group is associated with the first downlink frequency domain resource group; for example, the second downlink frequency domain resource group is an extension of the bandwidth of the first downlink frequency domain resource group; or, for example, the prerequisite for the UE to use the second downlink resource group is that the UE uses the first downlink resource group. Optionally, the UE does not listen to downlink control information or PDCCH on frequency domain resources outside the first downlink frequency domain resource group. For example, the UE does not listen to downlink control information or PDCCH in the second downlink frequency domain resource group.

[0616] Optionally, the UE receives a system message, which includes configuration information for a first downlink frequency domain resource, including configuration information for a second downlink frequency domain resource. For example, the system message includes the parameter scs-SpecificCarrierList, representing a set of carriers (first downlink frequency domain resources) used for different subcarrier spacings, and also includes the parameter extensionBandwidth, representing the extended bandwidth of the aforementioned carriers, for example, indicating the number of available REs.

[0617] Optionally, the scs-SpecificCarrierList indicates the carrierBandwidth, which is the width of the carrier measured in terms of the number of PRBs (Physical Resource Blocks). The extensionBandwidth parameter indicates information related to available frequency domain resource elements (such as available PRBs) outside the carrierBandwidth, and may include at least one of the following:

[0618] (1) Frequency domain reference points of available frequency domain resource units, such as reference points of a set of PRBs;

[0619] (2) Seventh offset: The seventh offset is the offset of the lowest frequency resource unit in the available frequency domain resource units from the frequency domain reference point, such as the offset of the lowest frequency resource unit in a group of PRBs from the reference point.

[0620] (3) The number of available frequency domain resource units, such as the number of PRBs.

[0621] Optionally, the frequency domain reference point (such as the reference point of an available frequency domain resource element) indicated by the extensionBandwidth parameter includes at least one of the following:

[0622] (1) The lowest frequency domain resource unit of the first downlink frequency domain resource group;

[0623] (2) The highest frequency domain resource unit of the first downlink frequency domain resource group;

[0624] (3) The next higher frequency frequency resource unit of the highest frequency resource unit in the first downlink frequency domain resource group;

[0625] (4) Common reference point pointA.

[0626] In this embodiment of the disclosure, the UE can also perform capability reporting. Optionally, the UE receives system information and sends preambles based on the system information. For example, the system information includes parameters related to random access, which specify a series of preamble partitions, each preamble partition being associated with a set of features. For example, an IE (Information Elements) FeatureCombination associates a set of preambles with a feature combination. For parameters available in this IE, the UE applies the field value when performing random access using the preamble in this IE; otherwise, the UE applies the corresponding value determined by the applicable requirement code (e.g., requirement S). Requirement S refers to the fact that when a field is marked as requirement S, it indicates that the UE's behavior needs to be standardized when the field is not present. Optionally, the preamble partition is related to reporting CSI in Msg1. For example, the FeatureCombination-r17 field contains CSIreportinMSG1; if CSIreportinMSG1 exists, this field indicates that reporting a CSI report in Msg1 is part of this feature combination. Optionally, the preamble partition is related to reporting CSI in Msg3. For example, the FeatureCombination-r17 field contains CSIreportinMsg3. If CSIreportinMsg3 exists, this field indicates that reporting CSI reports in Msg3 is part of this feature combination.

[0627] The method provided in this embodiment may further include step S511: sending a sounding reference signal (SRS).

[0628] Optionally, the UE receives system information and sends a reference signal, such as SRS, based on the system information.

[0629] Optionally, the UE receives system information, wherein the system information instructs the UE to transmit a reference signal on a specific resource, and the specific resource may be at least one of the following:

[0630] (1) First uplink frequency domain resource group;

[0631] (1) Second uplink frequency domain resource group;

[0632] (1) First uplink frequency domain resource group and second uplink frequency domain resource group;

[0633] In this context, the first uplink frequency domain resource group is the frequency domain resource group associated with the first downlink frequency domain resource group, and the second uplink frequency domain resource group is the frequency domain resource group associated with the second downlink frequency domain resource group. For example, in TDD (Time Division Duplexing) mode, the first uplink and first downlink frequency domain resource groups correspond to the same frequency domain resources, and the second downlink and second uplink frequency domain resource groups correspond to the same frequency domain resources. As another example, in FDD (Frequency Division Duplexing) mode, the first uplink and first downlink frequency domain resource groups are a pair of spectrums, and the second uplink and second downlink frequency domain resource groups are a set of spectrums. Furthermore, the indexes of the first uplink and first downlink frequency domain resource groups are the same, and the indexes of the second uplink and second downlink frequency domain resource groups are the same.

[0634] Optionally, the UE receives system messages, sends a preamble, and receives a PDSCH, wherein the PDSCH includes a random access response, the UE sends a PUSCH corresponding to Msg3, and an uplink reference signal. Optionally, the PDSCH corresponding to the random access response includes parameters instructing the UE to send the uplink reference signal. For example, the second PDSCH corresponding to the random access response includes indication information related to sending SRS; or, for example, the random access response includes parameters instructing the UE to send the uplink reference signal, or the uplink grant instructs the UE to send the uplink reference signal. Optionally, the PDSCH corresponding to the random access response includes parameters indicating the time-domain and / or frequency-domain resources of the uplink reference signal. The second PDSCH includes indication information related to the time-domain and / or frequency-domain resources for transmitting the SRS. For example, the random access response or uplink grant includes parameters indicating the time-domain / frequency-domain resources corresponding to Msg3. The time-domain resources of the uplink reference signal are the same as the time-domain resources of the PUSCH corresponding to Msg3, and / or the frequency-domain resources of the uplink reference signal are related to the frequency-domain resources of the PUSCH corresponding to Msg3. Optionally, the number of PRBs occupied by the frequency-domain resources of the uplink reference signal is equal to the number of PRBs occupied by the PUSCH corresponding to Msg3. Optionally, the offset between the starting frequency-domain resource unit of the uplink reference signal's frequency-domain resources and the second uplink frequency-domain resource group is equal to the offset between the starting frequency-domain resource unit of the PUSCH corresponding to Msg3 and the first uplink frequency-domain resource group. Optionally, the random access response or uplink grant includes a parameter indicating the configuration of at least one set of uplink reference signals. Based on this parameter and the configuration information of at least one set of uplink reference signals in the system information, the UE determines the time-domain / frequency-domain resources of the uplink reference signals. For example, the configuration information includes configuration information of 16 sets of reference signals, and the random access response or uplink grant includes four bits indicating one of the 16 sets of reference signals.

[0635] This design, in which the UE sends an uplink reference signal during the initial access phase, allows the base station to obtain the UE's uplink channel state during the initial access phase. Optionally, for a cell with multiple uplink frequency domain resource groups, the UE sends Msg3 in one of the uplink frequency domain resource groups and sends a reference signal in at least one of the remaining uplink frequency domain resource groups. This helps the base station obtain channel state information from multiple uplink frequency domain resource groups, thereby helping to allocate more suitable time-domain / frequency-domain resources and MCS to the UE, increasing the probability of successful UE decoding, and improving the system's spectral efficiency.

[0636] It should be noted that in this embodiment of the disclosure, the PDCCH can be used to schedule DL transmissions on the PDSCH and UL transmissions on the PUSCH, wherein the DCI on the PDCCH includes:

[0637] - Downlink allocation, which includes at least modulation and coding formats, resource allocation, and HARQ information related to DL-SCH (Downlink Shared Channel);

[0638] - Uplink scheduling permission, which includes at least the modulation and coding format, resource allocation, and HARQ information related to UL-SCH (Uplink Shared Channel).

[0639] Besides scheduling, PDCCH can also be used for:

[0640] - Activate and deactivate configured PUSCH transports using the configured authorization;

[0641] - Activation and deactivation of PDSCH semi-persistent transport;

[0642] - Notify one or more UEs of their slot format;

[0643] - Notify one or more UEs of the PRB and OFDM symbols, where the UEs may assume that no transmission is directed to the UE;

[0644] - Transmitting TPC (Transmit Power Control) commands for PUCCH and PUSCH;

[0645] - One or more TPC commands for SRS transmission are sent by one or more UEs;

[0646] - Switch the active bandwidth portion of the UE;

[0647] - Initiate the random access procedure;

[0648] - Instruct the UE to monitor the PDCCH during the next DRX on duration;

[0649] - In the context of IAB (Integrated Access Backhaul), this indicates the availability of soft symbols for IAB-DU (Distributed Unit);

[0650] - Trigger a single HARQ-ACK codebook feedback;

[0651] - Operations for shared spectrum channel access include at least one of the following:

[0652] - Triggers a switch in the search space set group;

[0653] - Indicate the available RB set and channel occupancy duration to one or more UEs;

[0654] - Indicates downlink feedback information for the configured grant-downlink feedback (such as CG-DFI, Configured Grant-Downlink FeedbackInformation).

[0655] In describing wireless communication systems and in the embodiments described above, higher-layer signaling or higher-layer signaling can be a signaling method for transmitting information from a base station to a terminal via a downlink data channel of the physical layer or from a terminal to a base station via an uplink data channel of the physical layer. Examples of signaling methods can include signaling methods for transmitting information via Radio Resource Control (RRC) signaling, Packet Data Convergence Protocol (PDCP) signaling, or MAC CE.

[0656] Optionally, higher-layer signaling may be signaling corresponding to at least one or a combination of the following signaling:

[0657] -MIB (Master Information Block);

[0658] -SIB or SIB x(x=1,2,…);

[0659] -RRC signaling;

[0660] -MAC CE;

[0661] Physical layer (Layer 1 (L1)) signaling can be signaling corresponding to at least one or a combination of the following signaling:

[0662] -PDCCH;

[0663] -DCI;

[0664] -UE-specific DCI;

[0665] - A group of public DCIs;

[0666] -Public DCI;

[0667] - Scheduling DCI (e.g., DCI used to schedule downlink or uplink data);

[0668] - Non-scheduled DCI (e.g., DCI other than the DCI used to schedule downlink or uplink data);

[0669] -PUCCH;

[0670] -UCI;

[0671] In this embodiment of the disclosure, uplink control signaling may include physical layer signaling and / or higher layer signaling. As described above, physical layer signaling may include UCI and / or PUCCH, and higher layer signaling may include RRC signaling and / or MAC CE.

[0672] In this embodiment of the disclosure, downlink control signaling may include physical layer signaling and / or higher layer signaling. Physical layer signaling may include one or more of PDCCH, DCI, UE-specific DCI, group common DCI, common DCI, scheduling DCI (e.g., DCI for scheduling downlink or uplink data), and unscheduled DCI. Higher layer signaling may include one or more of MIB, SIB or SIBx (x = 1, 2, ...), RRC signaling, or MAC CE. Therefore, "configure or indicate XX via downlink control signaling" will be understood as configuring or indicating XX via physical layer signaling, or configuring or indicating XX via higher layer signaling, or configuring or indicating XX via a combination of higher layer signaling and physical layer signaling.

[0673] This disclosure provides another method executed by the UE in a communication system, such as... Figure 11 As shown, the method includes:

[0674] Step S1102: Receive a second reference signal in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group, and the first downlink frequency domain resource group includes downlink frequency domain resources for transmitting system information and / or synchronization signals;

[0675] Step S1103: Send MsgA in the two-step random access process. The PUSCH corresponding to MsgA includes a CSI report related to the second reference signal.

[0676] The method provided in this disclosure may further include step S1101: receiving first configuration information related to at least two downlink frequency domain resource groups and second configuration information related to a second reference signal, wherein the at least two downlink frequency domain resource groups include a first downlink frequency domain resource group and a second downlink frequency domain resource group, and the second reference signal is associated with the second downlink frequency domain resource group;

[0677] Step S1104: Receive the third PDSCH on the second downlink frequency domain resource group.

[0678] The method provided in this embodiment may specifically include step S1104: receiving MsgB in a two-step random access process.

[0679] The method provided in this disclosure may further include steps S1105 and S1106.

[0680] Step S1105: Receive MsgB in the two-step random access process, where MsgB includes a fallback random access response;

[0681] Step S1106: Resend MsgA, the PUSCH corresponding to MsgA includes the CSI report.

[0682] For the embodiments of this disclosure, the content in the four-step random access process that is common to the two-step random access process can be found in the above description, for example:

[0683] Optionally, the method provided in this disclosure further includes: receiving indication information related to a second reference signal, the indication information related to the second reference signal being used to indicate that at least one set of configurations in the second configuration information is activated; wherein the indication information related to the second reference signal includes at least one of the following: a wake-up signal; a first physical downlink control channel (PDCCH) including paging-related information; and a first physical downlink shared channel (PDSCH) including paging-related information.

[0684] Optionally, the method provided in this disclosure further includes: receiving third configuration information related to a CSI report and first indication information related to a CSI report, the first indication information being used to indicate that at least one set of configurations in the third configuration information is activated; wherein the first indication information includes at least one of the following: a wake-up signal; a first PDCCH, the first PDCCH including paging-related information; a first PDSCH, the first PDSCH including paging-related information; an activation command; and first downlink control information (DCI).

[0685] Optionally, the method provided in this disclosure further includes: receiving second indication information related to a CSI report, the second indication information being used to indicate whether to send a CSI report; wherein the first indication information includes at least one of the following: third configuration information related to a CSI report; a wake-up signal; a first PDCCH, the first PDCCH including paging-related information; a first PDSCH, the first PDSCH including paging-related information; an activation command; and a first DCI.

[0686] Optionally, at least one row in the TDRA table includes first indication information (such as indication information for at least one set of configurations being activated included in the third configuration information), and the first DCI includes a field for indicating at least one row in the TDRA table.

[0687] Optionally, the first indication information includes a K-bit bitmap, where each bit in the bitmap is associated with a reference signal resource of K time-domain resource units;

[0688] Among them, the reference starting time domain resource unit corresponding to the K time domain resource units is the time domain resource unit where the downlink signal carrying the bitmap is located, or the reference starting time domain resource unit is the time domain resource unit where the lowest index SSB in the current SSB period is located;

[0689] The value of K is determined based on the DCI format provided by the second PDCCH.

[0690] Optionally, the DCI format provided by the second PDCCH includes the activation duration of the reference signal resource set.

[0691] Optionally, a CSI report is triggered if a first condition is met, wherein the first condition includes at least one of the following:

[0692] The measurement results of the second downlink frequency domain resource group meet the first threshold requirement;

[0693] The difference or absolute value of the measurement results of the first downlink frequency domain resource group and the measurement results of the second downlink frequency domain resource group meet the second threshold requirement;

[0694] The minimum operating bandwidth supported by the UE is greater than or equal to the first frequency difference, which is the frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group.

[0695] The minimum operating bandwidth supported by the UE is greater than or equal to the second frequency difference, which is the frequency difference between the highest frequency frequency resource element of the first downlink frequency domain resource group and the lowest frequency frequency resource element of the second downlink frequency domain resource group.

[0696] Optionally, the CSI report includes at least one of the following information:

[0697] CSI measurement results for at least one second downlink frequency domain resource group;

[0698] The minimum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0699] The maximum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0700] The index in the downlink frequency domain resource group where the CSI measurement result is greater than the first threshold;

[0701] The difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0702] The absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0703] The grade of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0704] The rank of the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0705] The UE's ability to measure the second downlink frequency domain resource group;

[0706] The relationship between the CSI measurement results of at least one downlink frequency domain resource group and the second threshold;

[0707] The relationship between the antenna ports of the first downlink frequency domain resource group and the antenna ports of the second downlink frequency domain resource group;

[0708] Quasi-co-address relationship between the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group.

[0709] Optionally, the second reference signal includes at least one of the following: primary synchronization signal, secondary synchronization signal, non-cell defined synchronization signal block (NCD-SSB), tracking reference signal (TRS), channel state information reference signal (CSI-RS), and demodulation reference signal (DMRS).

[0710] Optionally, the second reference signal may include at least one of the following:

[0711] Information related to the first reference signal;

[0712] Reference signal type.

[0713] Optionally, the preamble in MsgA is associated with whether the UE is configured to report CSI, and / or, the preamble in MsgA is associated with at least one set of CSI reports, and / or, the preamble in MsgA is associated with a second reference signal.

[0714] Optionally, step S1103 includes:

[0715] If the UE is configured to report CSI, the UE selects a first preamble group and sends a preamble based on the first preamble group; the first preamble group is associated with whether the UE is configured to report CSI, and / or the first preamble group is associated with at least one set of CSI reports, and / or the first preamble group is associated with a second reference signal.

[0716] or,

[0717] If the UE is not configured to report CSI, the UE selects the second preamble group and sends MsgA based on the second preamble group.

[0718] Optionally, if the UE is configured to report CSI, send MsgA, including:

[0719] If the first condition is met, select the first preamble group and send MsgA based on the first preamble group;

[0720] If the first condition is not met, select the second preamble group and send MsgA based on the second preamble group.

[0721] Optionally, the first condition includes at least one of the following:

[0722] (1) A random access procedure is initiated for CCCH, the sum of CCCH SDU size and MAC sub-header size is greater than the fourth threshold (e.g., ra-Msg3SizeGroupA), and the MAC sub-header includes a CSI report, or the sum of CCCH SDU size, MAC sub-header size and second MAC CE size is greater than the fifth threshold (e.g., ra-Msg3SizeGroupA), and the second MAC CE includes a CSI report.

[0723] (2) If the potential MsgA payload size (the uplink data available for transmission plus the MAC sub-header, and, if necessary, the MAC CE) is greater than the sixth threshold (e.g., ra MSGASizeGroupA), the MsgA includes a CSI report. Optionally, the MAC CE or the MAC sub-header includes a CSI report.

[0724] Optionally, if the UE is configured to send a CSI report during initial access, the one or more reference signal timings configured in the second configuration information include reference signal timings other than the initial downlink BWP; and / or,

[0725] If the UE is not configured to send a CSI report during the initial access process, or if the UE is not configured to include a CSI report in Msg3, or if the UE is not configured to send a CSI report on the PUSCH corresponding to Msg3, the UE will not receive a reference signal outside of the initial downlink BWP.

[0726] Optionally, the frequency domain location of the second reference information is determined based on at least one of the following information in the second configuration information:

[0727] The offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the frequency domain resource group where the reference signal is located on the common resource block grid;

[0728] The offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the initial BWP or default BWP of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0729] The offset between the Physical Resource Block (PRB) index of the starting frequency domain location of the second reference information and the center frequency point of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0730] Optionally, the period of the second reference signal is determined based on at least one of the following information in the second configuration information:

[0731] Relationship with SSB cycle;

[0732] Relationship with discontinuous reception DRX period;

[0733] Relationship with paging cycle;

[0734] Relationship with upward and downward allocation cycles;

[0735] The relationship with the timing of random access transmission.

[0736] Optionally, the method provided in this disclosure embodiment further includes:

[0737] Listen to the third PDCCH, which includes indication information related to the modulation and coding strategy (MCS). The indication information related to the MCS is used to indicate one of the multiple MCS tables.

[0738] The third PDSCH is received, and the MCS of the third PDSCH is determined based on the third PDCCH and channel state information.

[0739] Optionally, the first configuration information includes information related to the first bandwidth of the first downlink frequency domain resource group, and information related to available frequency domain resource units outside the first bandwidth.

[0740] Optionally, the first configuration information includes fourth configuration information related to the first downlink frequency domain resource group, and the fourth configuration information includes fifth configuration information related to the second downlink frequency domain resource group, wherein the second downlink frequency domain resource group is an available frequency domain resource unit other than the first downlink frequency domain resource group.

[0741] Optionally, the information related to the available frequency domain resource units includes at least one of the following:

[0742] Frequency domain reference points for available frequency domain resource units;

[0743] The seventh offset is the offset of the lowest available frequency domain resource element from the frequency domain reference point.

[0744] The number of available frequency domain resource units.

[0745] Optionally, the frequency domain reference point includes at least one of the following:

[0746] The lowest frequency domain resource unit of the first downlink frequency domain resource group;

[0747] The highest frequency domain resource unit in the first downlink frequency domain resource group;

[0748] The next higher frequency frequency resource unit in the highest frequency domain resource unit of the first downlink frequency domain resource group;

[0749] Public reference point A.

[0750] Optionally, the method provided in this disclosure further includes transmitting SRS if the second PDSCH corresponding to MsgB includes indication information related to transmitting SRS; and / or if the second PDSCH includes indication information related to time-domain resources and / or frequency-domain resources for transmitting SRS.

[0751] For any details regarding the embodiments of the two-step random access procedure that are not fully described, please refer to the description of the embodiments of the four-step random access procedure, which will not be repeated here.

[0752] The system access scheme provided in this disclosure can be applied to, but is not limited to, the following scenarios:

[0753] 1. Initial access under RRC_IDLE (idle state);

[0754] 2. Re-establish the RRC connection;

[0755] 3. Cell handover;

[0756] 4. The process of downlink data arriving and requesting random access in RRC connected state (when uplink is asynchronous);

[0757] 5. Uplink data arrival and random access request process in RRC connected state (when the uplink is asynchronous or no resources are allocated to the scheduling request in the PUCCH resource);

[0758] 6. Positioning.

[0759] This disclosure also provides a method executed by a base station in a communication system, the method comprising:

[0760] Receive preamble;

[0761] A random access response is sent in the first downlink frequency domain resource group, which includes an uplink grant. The first downlink frequency domain resource group includes downlink frequency domain resources used for transmitting system information and / or synchronization signals.

[0762] A second reference signal is transmitted in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group;

[0763] Receive the Physical Uplink Shared Channel (PUSCH), which is scheduled by uplink grant and includes a Channel State Information (CSI) report related to the second reference signal.

[0764] On the second downlink frequency domain resource group, the third PDSCH is transmitted.

[0765] Optionally, receiving the PDSCH includes:

[0766] The third PDCCH is sent, which includes indication information related to the modulation and coding strategy (MCS). The indication information related to the MCS is used to indicate one of the multiple MCS tables.

[0767] The third PDSCH is transmitted, and the MCS of the third PDSCH is determined based on the third PDCCH and channel state information.

[0768] Optionally, the method further includes:

[0769] Send second configuration information related to a reference signal, and indication information related to the second reference signal, wherein the indication information related to the second reference signal is used to indicate that at least one set of configurations in the second configuration information is activated;

[0770] The indication information related to the second reference signal includes at least one of the following:

[0771] Wake-up signal;

[0772] The first PDSCH includes paging-related information.

[0773] Optionally, the method further includes:

[0774] Send third configuration information related to the CSI report, and first indication information related to the CSI report, wherein the first indication information is used to indicate that at least one set of configurations in the third configuration information is activated;

[0775] The first instruction information includes at least one of the following:

[0776] Wake-up signal;

[0777] The first physical downlink control channel (PDCCH) includes paging-related information.

[0778] The first PDSCH includes paging-related information.

[0779] The activation command in the second PDSCH, which includes a random access response;

[0780] The first downlink control information (DCI) of the second PDSCH is scheduled;

[0781] The MAC subheader of the second PDSCH;

[0782] Random access response;

[0783] Upward authorization.

[0784] Optionally, the method further includes:

[0785] Receive second indication information related to the CSI report, the second indication information being used to indicate whether to send the CSI report;

[0786] The first instruction information includes at least one of the following:

[0787] Third-party configuration information related to CSI reports;

[0788] Wake-up signal;

[0789] The first PDCCH includes paging-related information;

[0790] The first PDSCH includes paging-related information.

[0791] The activation command in the second PDSCH, which includes a random access response;

[0792] Schedule the first DCI of the second PDSCH;

[0793] Random access response.

[0794] Optionally, the activation command is included in the random access response; and / or,

[0795] The activation command includes a first Media Access Control Protocol Data Unit (MAC PDU), which includes at least one of the following:

[0796] Signage for the service area;

[0797] Identifier for downlink frequency domain resource groups;

[0798] CSI resource identifiers;

[0799] CSI resource group identifier;

[0800] The Transmission Configuration Indicator (TCI) status identifier.

[0801] Optionally, at least one row in the Time Domain Resource Allocation (TDRA) table includes first indication information, and the first DCI includes a field for indicating at least one row in the TDRA table.

[0802] Optionally, the first indication information includes a K-bit bitmap, where each bit in the bitmap is associated with a reference signal resource of K time-domain resource units;

[0803] Among them, the reference starting time domain resource unit corresponding to the K time domain resource units is the time domain resource unit where the downlink signal carrying the bitmap is located, or the reference starting time domain resource unit is the time domain resource unit where the lowest index SSB in the current SSB period is located;

[0804] The value of K is determined based on the DCI format provided by the second PDCCH.

[0805] Optionally, the DCI format provided by the second PDCCH includes the activation duration of the reference signal resource set.

[0806] Optionally, a CSI report is triggered if a first condition is met, wherein the first condition includes at least one of the following:

[0807] The measurement results of the second downlink frequency domain resource group meet the first threshold requirement;

[0808] The difference or absolute value of the measurement results of the first downlink frequency domain resource group and the measurement results of the second downlink frequency domain resource group meet the second threshold requirement;

[0809] The minimum operating bandwidth supported by the UE is greater than or equal to the bandwidth of the first downlink frequency domain resource group;

[0810] The minimum operating bandwidth supported by the UE is greater than or equal to the first frequency difference, which is the frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group.

[0811] The minimum operating bandwidth supported by the UE is greater than or equal to the second frequency difference, which is the frequency difference between the highest frequency frequency resource element of the first downlink frequency domain resource group and the lowest frequency frequency resource element of the second downlink frequency domain resource group.

[0812] Optionally, the time-domain resource location of the second reference signal is determined based on at least one of the following:

[0813] Temporal resources used for the second PDCCH;

[0814] The first offset is the offset between the time-domain resources occupied by the second reference signal and the time-domain resources used for the second PDCCH.

[0815] Time-domain resources used for the second PDSCH;

[0816] The second offset is the offset between the time-domain resources occupied by the second reference signal and the time-domain resources used for the second PDSCH.

[0817] Optionally, the PUSCH includes Msg3 in the four-step random access process, the RRC message in Msg3 includes a CSI report, and / or, the second MAC CE or MAC sub-header of Msg3 includes a CSI report, and / or, the CSI report is multiplexed with uplink data on the PUSCH.

[0818] Optionally, the second MAC CE or MAC subheader includes at least one of the following information:

[0819] Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), Frequency Domain Resource Group Number, Bandwidth Part (BWP) Number, CSI Resource Index Number, CSI Reporting Index Number, CSI Type, and MAC CE Length.

[0820] The length of the MAC CE is related to the CSI type.

[0821] Optionally, the time-domain resources of PUSCH are determined based on a third offset and a first value. The third offset is the offset between the time-domain resource unit where the uplink grant is located and the time-domain resource unit where PUSCH is located, and the first value is related to the CSI report.

[0822] Optionally, the temporal resources of PUSCH are determined based on the sum of a third offset and a first value.

[0823] Optionally, the CSI report includes at least one of the following information:

[0824] CSI measurement results for at least one second downlink frequency domain resource group;

[0825] The minimum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0826] The maximum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0827] The index of the downlink frequency domain resource group whose CSI measurement result is greater than or equal to the first threshold;

[0828] The difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0829] The absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0830] The grade of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0831] The rank of the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0832] The UE's ability to measure the second downlink frequency domain resource group;

[0833] The relationship between the CSI measurement results of at least one downlink frequency domain resource group and the second threshold;

[0834] The relationship between the antenna ports of the first downlink frequency domain resource group and the antenna ports of the second downlink frequency domain resource group;

[0835] Quasi-co-addressable QCL relationship between the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group.

[0836] Optionally, the second reference signal includes at least one of the following: primary synchronization signal, secondary synchronization signal, non-cell defined synchronization signal block (NCD-SSB), tracking reference signal (TRS), channel state information reference signal (CSI-RS), and demodulation reference signal (DMRS).

[0837] Optionally, the second reference signal may include at least one of the following:

[0838] Information related to the first reference signal of the first downlink frequency domain resource group;

[0839] Reference signal type.

[0840] Optionally, the preamble is associated with whether the UE is configured to report CSI, and / or the preamble is associated with at least one set of CSI reports, and / or the preamble is associated with a second reference signal.

[0841] Optionally, the frequency domain location of the second reference information is determined based on at least one of the following:

[0842] The fourth offset is the offset between the physical resource block PRB index of the starting frequency domain position of the second reference information and the lowest index resource block of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0843] The fifth offset is the offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the initial BWP or default BWP of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0844] The sixth offset is the offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the center frequency point of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0845] Optionally, the period of the second reference signal is determined based on at least one of the following:

[0846] Relationship with SSB cycle;

[0847] Relationship with discontinuous reception DRX period;

[0848] Relationship with paging cycle;

[0849] Relationship with upward and downward allocation cycles;

[0850] The relationship with the timing of random access transmission.

[0851] Optionally, for the pre-authorized small data transfer process, receiving PUSCH includes:

[0852] Receive CSI reports on the first pre-authorized CG PUSCH.

[0853] Optionally, the first configuration information includes information related to the first bandwidth of the first downlink frequency domain resource group, and information related to available frequency domain resource units outside the first bandwidth.

[0854] Optionally, the first configuration information includes fourth configuration information related to the first downlink frequency domain resource group, and the fourth configuration information includes fifth configuration information related to the second downlink frequency domain resource group, wherein the second downlink frequency domain resource group is an available frequency domain resource unit other than the first downlink frequency domain resource group.

[0855] Optionally, the information related to the available frequency domain resource units includes at least one of the following:

[0856] Frequency domain reference points for available frequency domain resource units;

[0857] The seventh offset is the offset of the lowest available frequency domain resource element from the frequency domain reference point.

[0858] The number of available frequency domain resource units.

[0859] Optionally, the frequency domain reference point includes at least one of the following:

[0860] The lowest frequency domain resource unit of the first downlink frequency domain resource group;

[0861] The highest frequency domain resource unit in the first downlink frequency domain resource group;

[0862] The next higher frequency frequency resource unit in the highest frequency domain resource unit of the first downlink frequency domain resource group;

[0863] Public reference point A.

[0864] Optionally, if the second PDSCH corresponding to the random access response includes indication information related to the transmission of SRS; and / or if the second PDSCH includes configuration information related to time-domain resources and / or frequency-domain resources for transmitting SRS, the method further includes: receiving SRS.

[0865] This disclosure also provides another method performed by a base station in a communication system, the method comprising:

[0866] A second reference signal is transmitted in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group, and the first downlink frequency domain resource group includes downlink frequency domain resources for transmitting system information and / or synchronization signals;

[0867] The MsgA is received during the two-step random access process. The PUSCH corresponding to MsgA includes a Channel State Information (CSI) report related to the second reference signal.

[0868] On the second downlink frequency domain resource group, the third PDSCH is transmitted.

[0869] Optionally, receiving the PDSCH includes:

[0870] The third PDCCH is sent, which includes indication information related to the modulation and coding strategy (MCS). The indication information related to the MCS is used to indicate one of the multiple MCS tables.

[0871] The third PDSCH is transmitted, and the MCS of the third PDSCH is determined based on the third PDCCH and channel state information.

[0872] Optionally, the method further includes:

[0873] Send MsgB during the two-step random access process, which includes a fallback random access response.

[0874] Re-receive MsgA; the PUSCH corresponding to MsgA includes the CSI report.

[0875] Optionally, the method further includes:

[0876] Send second configuration information related to a reference signal, and indication information related to the second reference signal, wherein the indication information related to the second reference signal is used to indicate that at least one set of configurations in the second configuration information is activated;

[0877] The indication information related to the second reference signal includes at least one of the following:

[0878] Wake-up signal;

[0879] The first physical downlink shared channel (PDSCH) includes paging-related information.

[0880] Optionally, the method further includes:

[0881] Send third configuration information related to the CSI report, and first indication information related to the CSI report, wherein the first indication information is used to indicate that at least one set of configurations in the third configuration information is activated;

[0882] The first instruction information includes at least one of the following:

[0883] Wake-up signal;

[0884] The first physical downlink control channel (PDCCH) includes paging-related information.

[0885] The first PDSCH includes paging-related information.

[0886] Activation command;

[0887] First Downlink Control Information (DCI).

[0888] Optionally, the method further includes:

[0889] Send a second instruction message related to the CSI report, the second instruction message indicating whether to send the CSI report;

[0890] The first instruction information includes at least one of the following:

[0891] Third-party configuration information related to CSI reports;

[0892] Wake-up signal;

[0893] The first PDCCH includes paging-related information;

[0894] The first PDSCH includes paging-related information.

[0895] Activation command;

[0896] First DCI.

[0897] Optionally, at least one row in the Time Domain Resource Allocation (TDRA) table includes first indication information, and the first DCI includes a field for indicating at least one row in the TDRA table.

[0898] Optionally, the first indication information includes a K-bit bitmap, where each bit in the bitmap is associated with a reference signal resource of K time-domain resource units;

[0899] Among them, the reference starting time domain resource unit corresponding to the K time domain resource units is the time domain resource unit where the downlink signal carrying the bitmap is located, or the reference starting time domain resource unit is the time domain resource unit where the lowest index SSB in the current SSB period is located;

[0900] The value of K is determined based on the DCI format provided by the second PDCCH.

[0901] Optionally, the DCI format provided by the second PDCCH includes the activation duration of the reference signal resource set.

[0902] Optionally, a CSI report is triggered if a first condition is met, wherein the first condition includes at least one of the following:

[0903] The measurement results of the second downlink frequency domain resource group meet the first threshold requirement;

[0904] The difference or absolute value of the measurement results of the first downlink frequency domain resource group and the measurement results of the second downlink frequency domain resource group meet the second threshold requirement;

[0905] The minimum operating bandwidth supported by the UE is greater than or equal to the first frequency difference, which is the frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group.

[0906] The minimum operating bandwidth supported by the UE is greater than or equal to the second frequency difference, which is the frequency difference between the highest frequency frequency resource element of the first downlink frequency domain resource group and the lowest frequency frequency resource element of the second downlink frequency domain resource group.

[0907] Optionally, the CSI report includes at least one of the following information:

[0908] CSI measurement results for at least one second downlink frequency domain resource group;

[0909] The minimum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0910] The maximum value among the CSI measurement results of multiple downlink frequency domain resource groups;

[0911] The index in the downlink frequency domain resource group where the CSI measurement result is greater than the first threshold;

[0912] The difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0913] The absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0914] The grade of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0915] The rank of the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group;

[0916] The UE's ability to measure the second downlink frequency domain resource group;

[0917] The relationship between the CSI measurement results of at least one downlink frequency domain resource group and the second threshold;

[0918] The relationship between the antenna ports of the first downlink frequency domain resource group and the antenna ports of the second downlink frequency domain resource group;

[0919] Quasi-co-addressable QCL relationship between the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group.

[0920] Optionally, the second reference signal includes at least one of the following: primary synchronization signal, secondary synchronization signal, non-cell defined synchronization signal block (NCD-SSB), tracking reference signal (TRS), channel state information reference signal (CSI-RS), and demodulation reference signal (DMRS).

[0921] Optionally, the second reference signal may include at least one of the following:

[0922] Information related to the first reference signal;

[0923] Reference signal type.

[0924] Optionally, the preamble in MsgA is associated with whether the UE is configured to report CSI, and / or, the preamble in MsgA is associated with at least one set of CSI reports, and / or, the preamble in MsgA is associated with a second reference signal.

[0925] Optionally, the frequency domain location of the second reference information is determined based on at least one of the following:

[0926] The offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the frequency domain resource group where the reference signal is located on the common resource block grid;

[0927] The offset between the physical resource block (PRB) index of the starting frequency domain position of the second reference information and the lowest index resource block of the initial BWP or default BWP of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0928] The offset between the Physical Resource Block (PRB) index of the starting frequency domain location of the second reference information and the center frequency point of the frequency domain resource group where the reference signal is located on the common resource block grid.

[0929] Optionally, the period of the second reference signal is determined based on at least one of the following:

[0930] Relationship with SSB cycle;

[0931] Relationship with discontinuous reception DRX period;

[0932] Relationship with paging cycle;

[0933] Relationship with upward and downward allocation cycles;

[0934] The relationship with the timing of random access transmission.

[0935] Optionally, the first configuration information includes information related to the first bandwidth of the first downlink frequency domain resource group, and information related to available frequency domain resource units outside the first bandwidth.

[0936] Optionally, the first configuration information includes fourth configuration information related to the first downlink frequency domain resource group, and the fourth configuration information includes fifth configuration information related to the second downlink frequency domain resource group, wherein the second downlink frequency domain resource group is an available frequency domain resource unit other than the first downlink frequency domain resource group.

[0937] Optionally, the information related to the available frequency domain resource units includes at least one of the following:

[0938] Frequency domain reference points for available frequency domain resource units;

[0939] The seventh offset is the offset of the lowest available frequency domain resource element from the frequency domain reference point.

[0940] The number of available frequency domain resource units.

[0941] Optionally, the frequency domain reference point includes at least one of the following:

[0942] The lowest frequency domain resource unit of the first downlink frequency domain resource group

[0943] The highest frequency domain resource unit of the first downlink frequency domain resource group

[0944] The next higher frequency frequency resource unit in the highest frequency resource unit of the first downlink frequency domain resource group.

[0945] Public reference point A.

[0946] Optionally, if the second PDSCH corresponding to MsgB includes indication information related to the transmission of SRS; and / or if the second PDSCH includes indication information related to the time domain resources and / or frequency domain resources for transmitting SRS, it further includes: receiving SRS.

[0947] The method executed by the base station in this disclosure corresponds to the steps of the method executed by the UE, and their implementation principles are similar, with corresponding technical effects. For a detailed functional description of the method executed by the base station, please refer to the description of the method executed by the UE shown above; it will not be repeated here.

[0948] This disclosure provides an electronic device including a processor, and optionally, a transceiver and / or memory coupled to the processor. The processor is configured to perform the steps of the method provided in any optional embodiment of this disclosure. Optionally, the electronic device may refer to a UE (User Equipment), in which case the processor is configured to implement the steps of the various method embodiments executed by the UE. Detailed functional descriptions and beneficial effects can be found in the foregoing descriptions of the various method embodiments executed by the UE, and will not be repeated here. Optionally, the electronic device may refer to a base station, in which case the processor is configured to implement the steps of the various method embodiments executed by the base station. Detailed functional descriptions and beneficial effects can be found in the foregoing descriptions of the various method embodiments executed by the base station, and will not be repeated here. In practical applications, a UE or a base station can be understood as different network nodes.

[0949] This disclosure also provides an electronic device including at least one controller / processor, and optionally, at least one transceiver coupled to the at least one controller / processor, the processor being configured to perform the steps of the method provided in any optional embodiment of this disclosure.

[0950] Figure 12 The diagram shows a structural schematic of an electronic device to which an embodiment of the present invention applies, such as... Figure 12 As shown, Figure 12The illustrated electronic device 4000 includes a processor 4001 and a memory 4003. The processor 4001 and memory 4003 are connected, for example, via a bus 4002. Optionally, the electronic device 4000 may further include a transceiver 4004, which can be used for data interaction between the electronic device and other electronic devices, such as sending and / or receiving data. It should be noted that in practical applications, the transceiver 4004 is not limited to one type, and the structure of the electronic device 4000 does not constitute a limitation on the embodiments of this disclosure. Optionally, the electronic device may be a gNB, a UE, or other entities or nodes in a communication network.

[0951] Processor 4001 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with this disclosure. Processor 4001 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0952] Bus 4002 may include a pathway for transmitting information between the aforementioned components. Bus 4002 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 4002 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 12 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0953] The memory 4003 may be ROM (Read Only Memory) or other types of static storage devices capable of storing static information and instructions, RAM (Random Access Memory) or other types of dynamic storage devices capable of storing information and instructions, or EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media, other magnetic storage devices, or any other medium capable of carrying or storing computer programs and capable of being read by a computer, without limitation herein.

[0954] The memory 4003 is used to store computer programs that execute embodiments of the present disclosure, and its execution is controlled by the processor 4001. The processor 4001 is used to execute the computer programs stored in the memory 4003 to implement the steps shown in the foregoing method embodiments.

[0955] This disclosure provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can implement the steps and corresponding content of the aforementioned method embodiments.

[0956] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, can implement the steps and corresponding content of the aforementioned method embodiments.

[0957] The terms “first,” “second,” “third,” “fourth,” “1,” “2,” etc. (if present) in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in a sequence other than that shown in the figures or text.

[0958] It should be understood that although arrows indicate various operation steps in the flowcharts of the embodiments of this disclosure, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of the embodiments of this disclosure, the implementation steps in each flowchart can be executed in other orders as required. Furthermore, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage can also be executed at different times. In scenarios where execution times differ, the execution order of these sub-steps or stages can be flexibly configured as required, and the embodiments of this disclosure do not limit this.

[0959] The above text and accompanying drawings are provided as examples only to help the reader understand this disclosure. They are not intended and should not be construed as limiting the scope of this disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based on the content disclosed herein, that changes can be made to the illustrated embodiments and examples, and other similar implementations based on the technical concept of this disclosure can be adopted without departing from the scope of this disclosure, and these modifications and modifications are also within the protection scope of the embodiments of this disclosure.

Claims

1. A method executed by a user equipment in a communication system, characterized in that, include: Send the preamble; A random access response is received in the first downlink frequency domain resource group, the random access response including an uplink grant, the first downlink frequency domain resource group including downlink frequency domain resources for transmitting system information and / or synchronization signals; A second reference signal is received in at least one second downlink frequency domain resource group, wherein the at least one second downlink frequency domain resource group includes downlink frequency domain resources other than the first downlink frequency domain resource group; Transmit the Physical Uplink Shared Channel (PUSCH), which is scheduled by the uplink grant and includes a Channel State Information (CSI) report associated with the second reference signal; On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is received.

2. The method according to claim 1, characterized in that, Receive the PDSCH, including: Listen to the third PDCCH, which includes indication information related to the modulation and coding strategy (MCS), and the MCS-related indication information is used to indicate one of multiple MCS tables; The third PDSCH is received, and the MCS of the third PDSCH is determined based on the third PDCCH and the channel state information.

3. The method according to claim 1, characterized in that, The method also includes: The third PDSCH is received on the first downlink frequency domain resource group and the second downlink frequency domain resource group.

4. The method according to claim 3, characterized in that, The first indication information includes a K-bit bitmap, where each bit in the bitmap is associated with a reference signal resource of K time-domain resource units; Wherein, the reference starting time domain resource unit corresponding to the K time domain resource units is the time domain resource unit where the downlink signal carrying the bitmap is located, or the reference starting time domain resource unit is the time domain resource unit where the lowest index SSB is located in the current SSB cycle; The value of K is determined based on the DCI format provided by the second PDCCH.

5. The method according to claim 1, characterized in that, A CSI report is triggered when a first condition is met, wherein the first condition includes at least one of the following: The measurement results of the second downlink frequency domain resource group meet the first threshold requirement; The difference or absolute value of the measurement results of the first downlink frequency domain resource group and the measurement results of the second downlink frequency domain resource group meets the second threshold requirement; The minimum operating bandwidth supported by the UE is greater than or equal to the bandwidth of the first downlink frequency domain resource group; The minimum operating bandwidth supported by the UE is greater than or equal to a first frequency difference, where the first frequency difference is the frequency difference between the lowest frequency frequency resource element of the first downlink frequency domain resource group and the highest frequency frequency resource element of the second downlink frequency domain resource group. The minimum operating bandwidth supported by the UE is greater than or equal to the second frequency difference, which is the frequency difference between the highest frequency frequency resource element of the first downlink frequency domain resource group and the lowest frequency frequency resource element of the second downlink frequency domain resource group.

6. The method according to any one of claims 1-5, characterized in that, The time-domain resources of the PUSCH are determined based on a third offset and a first value. The third offset is the offset between the time-domain resource unit where the uplink grant is located and the time-domain resource unit where the PUSCH is located. The first value is related to the CSI report.

7. The method according to any one of claims 1-6, characterized in that, The CSI report includes at least one of the following information: CSI measurement results for at least one second downlink frequency domain resource group; The minimum value among the CSI measurement results of multiple downlink frequency domain resource groups; The maximum value among the CSI measurement results of multiple downlink frequency domain resource groups; The index of the downlink frequency domain resource group whose CSI measurement result is greater than or equal to the first threshold; The difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group; The absolute value of the difference between the CSI measurement result of the second downlink frequency domain resource group and the CSI measurement result of the first downlink frequency domain resource group; The grade of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group; The rank of the absolute value of the difference between the CSI measurement results of the second downlink frequency domain resource group and the CSI measurement results of the first downlink frequency domain resource group; The UE's ability to measure the second downlink frequency domain resource group; The relationship between the CSI measurement results of at least one downlink frequency domain resource group and the second threshold; The association between the antenna ports of the first downlink frequency domain resource group and the antenna ports of the second downlink frequency domain resource group; The quasi-co-address QCL relationship between the CSI of the first downlink frequency domain resource group and the CSI of the second downlink frequency domain resource group.

8. The method according to any one of claims 1-7, characterized in that, The preamble is associated with whether the UE is configured to report CSI, and / or the preamble is associated with at least one set of CSI reports, and / or the preamble is associated with the second reference signal.

9. The method according to claims 1-8, characterized in that, The preamble to be sent includes: If the UE is configured to report CSI, the UE selects a first preamble group and sends a preamble based on the first preamble group; the first preamble group is associated with whether the UE is configured to report CSI, and / or the first preamble group is associated with at least one set of CSI reports, and / or the first preamble group is associated with the second reference signal; or, If the UE is not configured to report CSI, the UE selects the second preamble group and sends the preamble based on the second preamble group.

10. The method according to claims 1-9, characterized in that, If the UE is configured to report CSI, the transmission of the preamble includes: If the first condition is met, select the first preamble group and send the preamble based on the first preamble group; If the first condition is not met, select the second preamble group and send the preamble based on the second preamble group.

11. The method according to any one of claims 1-10, characterized in that, The period of the second reference signal is determined based on at least one of the following: Relationship with SSB cycle; Relationship with discontinuous reception DRX period; Relationship with paging cycle; Relationship with upward and downward allocation cycles; The relationship with the timing of random access transmission.

12. The method according to any one of claims 1-11, characterized in that, The configuration information related to the first downlink frequency domain resource group includes information related to the first bandwidth of the first downlink frequency domain resource group, as well as information related to available frequency domain resource units outside the first bandwidth.

13. The method according to any one of claims 1-12, characterized in that, If the second PDSCH corresponding to the random access response includes indication information related to the transmission of SRS; and / or, if the second PDSCH includes configuration information related to time-domain resources and / or frequency-domain resources for transmitting SRS, it further includes: Send the Sound Reference Signal (SRS).

14. A method executed by a user equipment in a communication system, characterized in that, include: A second reference signal is received in at least one second downlink frequency domain resource group, the at least one second downlink frequency domain resource group including downlink frequency domain resources other than the first downlink frequency domain resource group, the first downlink frequency domain resource group including downlink frequency domain resources for transmitting system information and / or synchronization signals; Send MsgA during the two-step random access process, wherein the physical uplink shared channel PUSCH corresponding to MsgA includes a channel state information (CSI) report related to the second reference signal; On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is received.

15. The method according to claim 14, characterized in that, Receive the PDSCH, including: Listen to the third PDCCH, which includes indication information related to the modulation and coding strategy (MCS), and the MCS-related indication information is used to indicate one of multiple MCS tables; The third PDSCH is received, and the MCS of the third PDSCH is determined based on the third PDCCH and the channel state information.

16. The method according to claim 14, characterized in that, The method also includes: The third PDSCH is received on the first downlink frequency domain resource group and the second downlink frequency domain resource group.

17. A method executed by a base station in a communication system, characterized in that, include: Receive preamble; A random access response is sent in the first downlink frequency domain resource group, the random access response including an uplink grant, the first downlink frequency domain resource group including downlink frequency domain resources for transmitting system information and / or synchronization signals; A second reference signal is transmitted in at least one second downlink frequency domain resource group, the at least one second downlink frequency domain resource group including downlink frequency domain resources other than the first downlink frequency domain resource group; Receive the Physical Uplink Shared Channel (PUSCH), which is scheduled by the uplink grant and includes a Channel State Information (CSI) report associated with the second reference signal; On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is transmitted.

18. A method executed by a base station in a communication system, characterized in that, include: A second reference signal is transmitted in at least one second downlink frequency domain resource group, the at least one second downlink frequency domain resource group including downlink frequency domain resources other than the first downlink frequency domain resource group, the first downlink frequency domain resource group including downlink frequency domain resources for transmitting system information and / or synchronization signals; Receive MsgA in the two-step random access process, wherein the PUSCH corresponding to MsgA includes a Channel State Information (CSI) report related to the second reference signal; On the second downlink frequency domain resource group, the third physical downlink shared channel (PDSCH) is transmitted.

19. A user equipment, characterized in that, include: transceiver, and A processor, coupled to the transceiver and configured to perform the method according to any one of claims 1-16.

20. A user equipment, characterized in that, include: transceiver, and A processor, coupled to the transceiver and configured to perform the method of claim 17 or 18.

Images