Communication method, user equipment and base station

Abstract

The embodiment of the invention provides a communication method, user equipment and a base station, and relates to the technical field of wireless communication. The method comprises the following steps: receiving first information, wherein the first information is used for indicating a first random access resource; sending the lead code on a first uplink resource, wherein the first uplink resource is determined based on a first random access resource indicated by the first information; in the second time window, when the first downlink control information is received, the PDCCH is monitored based on the first RA-RNTI in the second time window for receiving the random access response, the first downlink control information is used for indicating the first random access resource, and the first RA-RNTI is determined based on the first uplink resource and the first downlink control information. According to the embodiment of the invention, the random access performance of the UE can be improved.

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] To meet the increased demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or near-5G communication systems. Therefore, 5G or near-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems".

[0003] 5G communication systems are implemented in higher frequency (millimeter wave, mmWave) bands, such as the 60GHz band, to achieve higher data rates. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies are discussed in 5G communication systems.

[0004] In addition, in 5G communication systems, development is underway to improve the system network based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, cooperative multipoint (CoMP), receiver interference cancellation, and other technologies.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding and modulation (ACM), as well as filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies. Summary of the Invention

[0006] The purpose of this disclosure is to solve the technical problem of how to improve the reliability of random access while achieving network energy saving.

[0007] According to one aspect of the present disclosure, a method performed by a UE in a communication system is provided, the method comprising: Receive first information, which is used to indicate a first random access resource; A preamble is sent on a first uplink resource, which is determined based on a first random access resource indicated by the first information. If the first downlink control information is received in the second time window, the PDCCH is monitored based on the first RA-RNTI within the second time window to receive random access responses. The first downlink control information is used to indicate the first random access resource, and the first RA-RNTI is determined based on the first uplink resource and the first downlink control information.

[0008] Optionally, during the second time window, the PDCCH is monitored based on the first RA-RNTI to receive random access responses, including: If the first random access resource indicated by the first information and the first random access resource indicated by the first downlink control information are different, the PDCCH is monitored based on the first RA-RNTI within the second time window to receive the random access response.

[0009] Optionally, during the second time window, the PDCCH is monitored based on the first RA-RNTI to receive random access responses, including: Under at least one of the following conditions, the PDCCH is monitored based on the first RA-RNTI during the second time window to receive random access responses: PDCCH not detected; The PDCCH was detected, but the LSB of the SFN field of the detected PDCCH is different from the corresponding LSB of the SFN of the first uplink resource.

[0010] Optionally, during the second time window, the PDCCH is monitored based on the first RA-RNTI to receive random access responses, including at least one of the following: After receiving the first downlink control information, within the first time interval, the PDCCH is monitored based on the first RA-RNTI to receive random access responses within the second time window. Within a first time interval after receiving the first downlink control information, the PDCCH is monitored based on the second RA-RNTI to receive random access responses. The second RA-RNTI is determined based on the first uplink resource. The first time interval is the effective time interval for the first downlink control information.

[0011] Optionally, the first RA-RNTI is determined based on at least one of the following: The first uplink resource and the first random access resource indicated by the first downlink control information; The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information; The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; The frequency index of the first uplink resource, the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information, and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; The number of frequency domain resources corresponding to the configured second random access resource.

[0012] Optionally, the first RA-RNTI is determined based on random access resource information related to the first uplink resource, which is used to indicate whether the first uplink resource is related to the second feature.

[0013] Optionally, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0014] Optionally, the minimum frequency index of the first random access resource is greater than the maximum frequency index of the second random access resource. The maximum frequency index of the second random access resource is determined based on the number of frequency domain resources of the second random access resource. Starting from the frequency starting position of the first random access resource, the frequency index of the first random access resource is ordered in ascending order from low to high frequency based on the number of frequency domain resources of the first random access resource.

[0015] Optionally, the frequency index of the first random access resource is determined based on the following formula:

[0016] in, This indicates the frequency domain location number of the first random access resource. This indicates the number of frequency domain resources in the first random access resource. Indicates the total number of frequency domain resources. This indicates the modulo operation.

[0017] Optionally, the first information indicates that the first random access resource is activated and / or deactivated, and the frequency index of the activated first random access resource is determined based on at least one of the following methods: The frequency starting position of the activated first random access resource and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the number of frequency domain resources of the second random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0018] Optionally, the first information indicates that the first random access resource is activated and / or deactivated. The first uplink resource is the first available first random access resource among the activated first random access resources; and / or, the first uplink resource is selected from the configured second random access resource and the activated first random access resource according to the first criterion; and / or, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource. The first criterion includes at least one of the following: If the second random access resource and the activated first random access resource are time-division multiplexed, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource; If the second random access resource and the activated first random access resource are frequency division multiplexing (FDM), the first uplink resource is the first available first random access resource among the activated first random access resources.

[0019] Optionally, the first information and / or the first downlink control information includes at least one of the following: Mask information for the mapping between the SSB and the first random access resource activation; Periodic index of the mapping between SSB and first random access resource activation; PRACH associated periodic index; PRACH Association Pattern Periodic Index; At least one fourth RA-RNTI; Refer to the number of fourth RA-RNTIs and fourth RA-RNTIs; Frequency unit index; Time unit index.

[0020] Optionally, the first information includes random access-related configuration information and / or downlink control information.

[0021] Optionally, the method further includes: After receiving the first downlink control information, a preamble is sent based on the first transmission power, which is determined based on the first power step size, which is determined by the first downlink control information.

[0022] According to another aspect of the embodiments of this disclosure, a method performed by a UE in a communication system is provided, the method comprising: Receive first information, which is used to indicate a first random access resource; A preamble is sent on a first uplink resource, which is determined based on a first random access resource indicated by the first information. If the first downlink control information is received in the second time window, the second time window is stopped, and a preamble is sent on the second uplink resource. The second uplink resource is determined based on the first downlink control information. The transmission power of the preamble sent on the second uplink resource is related to the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information.

[0023] Optionally, the second time window is stopped, and a preamble is sent on the second uplink resource, including: If the first random access resource indicated by the first information and the first random access resource indicated by the first downlink control information are different, the second time window is stopped and a preamble is sent on the second uplink resource.

[0024] Optionally, the second time window is stopped, and a preamble is sent on the second uplink resource, including: If the second RA-RNTI and the third RA-RNTI are different, stop the second time window and send the preamble on the second uplink resource; The second RA-RNTI is determined based on the first uplink resource, and the third RA-RNTI is determined based on the second uplink resource.

[0025] Optionally, the second time window is stopped, and a preamble is sent on the second uplink resource, including: The second time window is stopped and a preamble is sent on the second uplink resource if at least one of the following conditions is met: PDCCH not detected; The PDCCH was detected, but the least significant bit (LSB) of the SFN field of the detected PDCCH was different from the corresponding LSB of the SFN of the first uplink resource.

[0026] Optionally, the interval between the transmission time of the preamble on the second uplink resource and the end time of the second time window is greater than the second time interval, which is preset and / or determined based on the UE's capabilities.

[0027] Optionally, the transmission power of the preamble transmitted on the second uplink resource is determined based on the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information and at least one threshold.

[0028] Optionally, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0029] Optionally, the minimum frequency index of the first random access resource is greater than the maximum frequency index of the second random access resource. The maximum frequency index of the second random access resource is determined based on the number of frequency domain resources of the second random access resource. Starting from the frequency starting position of the first random access resource, the frequency index of the first random access resource is ordered in ascending order from low to high frequency based on the number of frequency domain resources of the first random access resource.

[0030] Optionally, the frequency index of the first random access resource is determined based on the following formula:

[0031] in, This indicates the frequency domain location number of the first random access resource. This indicates the number of frequency domain resources in the first random access resource. Indicates the total number of frequency domain resources. This indicates the modulo operation.

[0032] Optionally, the first information indicates that the first random access resource is activated and / or deactivated, and the frequency index of the activated first random access resource is determined based on at least one of the following methods: The frequency starting position of the activated first random access resource and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the number of frequency domain resources of the second random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0033] Optionally, the first information indicates that the first random access resource is activated and / or deactivated. The first uplink resource is the first available first random access resource among the activated first random access resources; and / or, the first uplink resource is selected from the configured second random access resource and the activated first random access resource according to the first criterion; and / or, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource. The first criterion includes at least one of the following: If the second random access resource and the activated first random access resource are time-division multiplexed, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource; If the second random access resource and the activated first random access resource are frequency division multiplexing (FDM), the first uplink resource is the first available first random access resource among the activated first random access resources.

[0034] Optionally, the first information and / or the first downlink control information includes at least one of the following: Mask information for the mapping between the SSB and the first random access resource activation; Periodic index of the mapping between SSB and first random access resource activation; PRACH associated periodic index; PRACH Association Pattern Periodic Index; At least one fourth RA-RNTI; Refer to the number of fourth RA-RNTIs and fourth RA-RNTIs; Frequency unit index; Time unit index.

[0035] Optionally, the first information includes random access-related configuration information and / or downlink control information.

[0036] According to another aspect of the embodiments of this disclosure, a method performed by a UE in a communication system is also provided, the method comprising: Receive first configuration information related to a first random access and second configuration information related to a second random access, wherein the first configuration information is related to a second feature; A preamble is sent on the first uplink resource, which is determined based on the first configuration information; The second RA-RNTI is used to listen to the PDCCH to receive random access responses. The second RA-RNTI is determined based on the first configuration information and the second configuration information, or based on the first configuration information.

[0037] Optionally, the second RA-RNTI is determined based on the random access resource information of the first uplink resource, which is used to indicate whether the first uplink resource is related to the second feature.

[0038] Optionally, the method further includes: receiving second downlink control information, the second downlink control information being used to indicate a first random access resource, the first uplink resource being determined based on first configuration information and the second downlink control information.

[0039] Optionally, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0040] Optionally, the method further includes: upon receiving first downlink control information in a second time window, listening to the PDCCH based on the first RA-RNTI within the second time window to receive a random access response, wherein the first downlink control information is used to indicate a first random access resource, and the first RA-RNTI is determined based on the first uplink resource and the first downlink control information.

[0041] According to another aspect of the present disclosure, a method performed by a base station in a communication system is provided, the method comprising: Send a first message, which is used to indicate a first random access resource; The UE is monitoring the preamble sent by the UE. The preamble is sent on the first uplink resource, which is determined by the UE based on the first random access resource indicated by the first information. Send first downlink control information, which is used to indicate the first random access resource; The PDCCH is sent based on the first RA-RNTI to send a random access response. The first RA-RNTI is determined based on the first uplink resource and the first downlink control information.

[0042] 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: Send a first message, which is used to indicate a first random access resource; Listen to the preamble sent by the UE, which is sent on the first uplink resource. The first uplink resource is determined by the UE based on the first random access resource indicated by the first information. Send first downlink control information, which is used to indicate the first random access resource; The system monitors the preamble sent by the UE. The preamble is sent on the second uplink resource, which is determined based on the first downlink control information. The received power of the preamble is related to the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information.

[0043] According to another aspect of the embodiments of this disclosure, a method performed by a base station in a communication system is also provided, the method comprising: Send first configuration information related to the first random access and second configuration information related to the second random access, wherein the first configuration information is related to the second feature; Listen for the preamble sent by the UE. The preamble is sent on the first uplink resource, which is determined based on the first configuration information. The PDCCH is sent based on the second RA-RNTI to send a random access response. The second RA-RNTI is determined based on the first configuration information and the second configuration information, or determined based on the first configuration information.

[0044] According to another aspect of the embodiments of the present disclosure, a user equipment is provided, the user equipment comprising: transceiver, and 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.

[0045] According to another aspect of the present disclosure, a base station is provided, the base station comprising: transceiver, and 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.

[0046] According to another aspect of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, 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.

[0047] 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.

[0048] The communication method and user equipment provided in this disclosure, by receiving first information, which indicates a first random access resource; sending a preamble on a first uplink resource, the first uplink resource being determined based on the first random access resource indicated by the first information; and receiving first downlink control information within a second time window, then listening to the physical downlink control channel (PDCCH) based on the first random access radio network temporary identifier (RA-RNTI) within the second time window to receive a random access response, wherein the first downlink control information indicates the first random access resource, and the first RA-RNTI is determined based on the first uplink resource and the first downlink control information, can enhance the reliability of receiving the random access response and improve the performance of random access. Attached Figure Description

[0049] 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.

[0050] Figure 1 A schematic diagram of the overall structure of the wireless network provided in this embodiment of the disclosure; Figure 2aA schematic diagram of the transmission path provided in an embodiment of this disclosure; Figure 2b A schematic diagram of the receiving path provided in the embodiments of this disclosure; Figure 3a This is a schematic diagram of the structure of a UE provided in an embodiment of this disclosure; Figure 3b This is a schematic diagram of the structure of a base station provided in an embodiment of this disclosure; Figure 4 A flowchart illustrating a method executed by a UE according to an embodiment of this disclosure; Figure 5a A schematic diagram illustrating a method for determining the frequency index of a first random access resource according to an embodiment of this disclosure; Figure 5b A schematic diagram illustrating a second method for determining the frequency index of a first random access resource provided in an embodiment of this disclosure; Figure 5c A schematic diagram of a third method for determining the frequency index of a first random access resource provided in an embodiment of this disclosure; Figure 6a A schematic diagram illustrating a fourth method for determining the frequency index of a first random access resource provided in an embodiment of this disclosure; Figure 6b A schematic diagram illustrating a fifth method for determining the frequency index of a first random access resource provided in an embodiment of this disclosure; Figure 6c A schematic diagram of a sixth method for determining the frequency index of a first random access resource provided in an embodiment of this disclosure; Figure 7 A schematic diagram of a method for determining the frequency index of a first random access resource, provided in an embodiment of this disclosure; Figure 8 A schematic diagram of the method for determining the frequency index of the first random access resource in the eighth embodiment of this disclosure; Figure 9 A schematic diagram of a method for determining the frequency index of a first random access resource, provided in an embodiment of this disclosure; Figure 10 A schematic diagram of a method for determining the frequency index of a first random access resource according to an embodiment of this disclosure; Figure 11 This is a schematic diagram illustrating a process for a UE to receive a random access response, provided in an embodiment of this disclosure. Figure 12 A flowchart illustrating a method executed by a UE in another communication system provided in this disclosure embodiment; Figure 13 A schematic diagram of a four-step random access process provided in an embodiment of this disclosure; Figure 14 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. Detailed Implementation

[0051] The following description, with reference to the accompanying drawings, is provided to aid in a thorough understanding of the various embodiments of this disclosure as defined by the claims and their equivalents. This description includes various specific details to aid understanding but should be considered exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of this disclosure. Furthermore, for clarity and brevity, descriptions of well-known functions and structures may be omitted.

[0052] The terms and wording used in the following description and claims are not limited to their dictionary meanings, but are merely used by the inventors to enable a clear and consistent understanding of this disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this disclosure is for illustrative purposes only and not for limiting the purpose of this disclosure as defined in the appended claims and their equivalents.

[0053] It should be understood that the singular forms of “one,” “an,” and “the” include plural references unless the context clearly indicates otherwise. Thus, for example, the reference to “component surface” includes one or more such surfaces.

[0054] The terms “comprising” or “may include” refer to the presence of a corresponding disclosed function, operation, or component that may be used in the various embodiments of this disclosure, rather than limiting the presence of one or more additional functions, operations, or features. Furthermore, the terms “comprising” or “having” may be interpreted as indicating certain characteristics, numbers, steps, operations, constituent elements, components, or combinations thereof, but should not be construed as excluding the possibility of the presence of one or more other characteristics, numbers, steps, operations, constituent elements, components, or combinations thereof.

[0055] The term "or" as used in the various embodiments of this disclosure includes any of the listed terms and all combinations thereof. For example, "A or B" may include A, may include B, or may include both A and B.

[0056] Unless otherwise defined, all terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by those skilled in the art. Common terms as defined in dictionaries are to be interpreted as having a meaning consistent with their context in the relevant technical field and should not be interpreted ideally or overly formally, unless expressly defined in this disclosure.

[0057] The various embodiments of this disclosure can be applied to various communication systems, such as: Global System for Mobile Communications (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) systems, General Packet Radio Service (GPRS), Long Term Evolution (LTE) systems, Frequency Division Duplex (FDD) systems, Time Division Duplex (TDD) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, 5th Generation (5G) systems, or New Radio (NR) systems, etc. Furthermore, the various embodiments of this disclosure can be applied to future-oriented communication technologies.

[0058] Figure 1 An example wireless network 100 according to various embodiments of the present disclosure is shown. Figure 1 The embodiment of the wireless network 100 shown is for illustrative purposes only. Other embodiments of the wireless network 100 can be used without departing from the scope of this disclosure.

[0059] Wireless network 100 includes gNodeB (gNB) 101, gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a proprietary IP network, or other data network.

[0060] Depending on the network type, other well-known terms such as "base station (BS)" or "access point" can be used instead of "gNodeB" or "gNB". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals. Furthermore, depending on the network type, other well-known terms such as "mobile station", "user station", "remote terminal", "wireless terminal", or "user device" can be used instead of "user equipment" or "UE". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to remote wireless devices that wirelessly access the gNB, whether the UE is a mobile device (such as a mobile phone or smartphone) or a fixed device as commonly understood (such as a desktop computer or vending machine).

[0061] gNB 102 provides wireless broadband access to network 130 to multiple first user equipments (UEs) within its coverage area 120. 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 (R); UE 115, which may be located in a second residence (R); and UE 116, which may be a mobile device (M), such as a cellular phone, wireless laptop computer, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 to multiple second UEs within its coverage area 125. The multiple second UEs include UE 115 and UE 116. In some embodiments, one or more of gNBs 101-103 are capable of communicating with each other and with UEs 111-116 using 5G, LTE, LTE-A, WiMAX, or other advanced wireless communication technologies.

[0062] The dashed lines indicate the approximate extent of coverage areas 120 and 125, which are shown as approximately circular for illustrative and explanatory purposes only. It should be clearly understood that coverage areas associated with the gNB, such as coverage areas 120 and 125, can have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstacles.

[0063] As described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of this disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook design and architecture for systems having 2D antenna arrays.

[0064] although Figure 1 An example of a wireless network 100 is shown, but it is possible to... Figure 1 Various 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. In addition, 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.

[0065] Figure 2a and Figure 2b Example wireless transmit and receive paths according to this disclosure are shown. In the following description, transmit path 200 can be described as being implemented in a gNB (such as gNB 102), while receive path 250 can be described as being implemented in a UE (such as UE 116). However, it should be understood that receive path 250 can be implemented in a gNB, and transmit path 200 can be implemented in a UE. In some embodiments, receive path 250 is configured to support codebook design and structure for a system having a 2D antenna array as described in embodiments of this disclosure.

[0066] The transmit path 200 includes a channel coding and modulation block 205, a serial-to-parallel (S-to-P) block 210, an N-point inverse fast Fourier transform (IFFT) block 215, a parallel-to-serial (P-to-S) block 220, a cyclic prefix addition block 225, and an up-converter (UC) 230. The receive path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a serial-to-parallel (S-to-P) block 265, an N-point fast Fourier transform (FFT) block 270, a parallel-to-serial (P-to-S) block 275, and a channel decoding and demodulation block 280.

[0067] In transmit path 200, channel coding and modulation block 205 receives a set of information bits, applies coding (such as low-density parity-check (LDPC) coding), and modulates the input bits (such as using quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. Serial-to-parallel (S-to-P) block 210 converts (e.g., demultiplexes) the serial modulated symbols into parallel data to generate N parallel symbol streams, where N is the number of IFFT / FFT points used in gNB 102 and UE 116. N-point IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. Parallel-to-serial block 220 converts (e.g., multiplexes) the parallel time-domain output symbols from N-point IFFT block 215 to generate a serial time-domain signal. Cyclic prefix addition block 225 inserts a cyclic prefix into the time-domain signal. Upconverter 230 modulates (e.g., upconverts) the output of the added cyclic prefix block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at the baseband before being converted to the RF frequency.

[0068] The RF signal transmitted from gNB 102 reaches UE 116 after passing through the wireless channel, and UE 116 performs the opposite operation to that at gNB 102. Downconverter 255 downconverts the received signal to the baseband frequency, and cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. N-point FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. Parallel-to-serial block 275 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0069] Each of gNBs 101-103 can implement a transmission path 200 similar to that used for transmission to UEs 111-116 in the downlink, and a reception path 250 similar to that used for reception from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 can implement a transmission path 200 for transmission to gNBs 101-103 in the uplink, and a reception path 250 for reception from gNBs 101-103 in the downlink.

[0070] Figure 2a and Figure 2b Each of the components can be implemented using only hardware, or using a combination of hardware and software / firmware. As a specific example, Figure 2a and Figure 2bAt least some of the components can be implemented in software, while others can be implemented in configurable hardware or a combination of software and configurable hardware. For example, FFT block 270 and IFFT block 215 can be implemented as configurable software algorithms, wherein the value of the number of points N can be modified according to the implementation method.

[0071] Furthermore, although the description uses FFT and IFFT, this is merely illustrative and should not be construed as limiting the scope of this disclosure. Other types of transforms, such as the Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions, can be used. It should be understood that for DFT and IDFT functions, the value of variable N can be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N can be any integer that is a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0072] although Figure 2a and Figure 2b An example of a wireless transmit and receive path is shown, but it is possible to modify it further. Figure 2a and Figure 2b Make various changes. For example, Figure 2a and Figure 2b The various components can be combined, further subdivided, or omitted, and additional components can be added as needed. Furthermore, Figure 2a and Figure 2b This is intended to illustrate examples of the types of send and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0073] Figure 3a Example UE 116 according to this disclosure is shown. Figure 3a The embodiment of UE 116 shown is for illustrative purposes only, and Figure 1 UEs 111-115 can have the same or similar configurations. However, UEs have a wide variety of configurations, and Figure 3a This disclosure is not intended to limit the scope of any particular implementation of the UE.

[0074] UE 116 includes an antenna 301, a radio frequency (RF) transceiver 302, a transmit (TX) processing circuitry 303, a microphone 304, and a receive (RX) processing circuitry 305. UE 116 also includes a speaker 306, a controller / processor 307, an input / output (I / O) interface (IF) 308, multiple input devices 309, a display 310, and a memory 311. The memory 311 includes an operating system (OS) 312 and one or more applications 313.

[0075] RF transceiver 302 receives incoming RF signals transmitted by a gNB of wireless network 100 from antenna 301. RF transceiver 302 down-converts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 305, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 305 sends the processed baseband signal to speaker 306 (e.g., for voice data) or to controller / processor 307 (e.g., for web browsing data) for further processing.

[0076] TX processing circuitry 303 receives analog or digital voice data from microphone 304, or other outgoing baseband data (such as network data, email, or interactive video game data) from controller / processor 307. TX processing circuitry 303 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate processed baseband or IF signals. RF transceiver 302 receives the processed outgoing baseband or IF signals from TX processing circuitry 303 and up-converts the baseband or IF signals into RF signals transmitted via antenna 301.

[0077] The controller / processor 307 may include one or more processors or other processing devices and execute an OS 312 stored in memory 311 to control the overall operation of the UE 116. For example, the controller / processor 307 may control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceiver 302, the RX processing circuit 305, and the TX processing circuit 303 according to known principles. In some embodiments, the controller / processor 307 includes at least one microprocessor or microcontroller.

[0078] The controller / processor 307 is also capable of executing other processes and programs residing in the memory 311, such as operations for channel quality measurement and reporting for a system having a 2D antenna array as described in the embodiments of this disclosure. The controller / processor 307 is capable of moving data into or out of the memory 311 as needed for the execution of the process. In some embodiments, the controller / processor 307 is configured to execute an application 313 based on the OS 312 or in response to signals received from a gNB or operator. The controller / processor 307 is also coupled to an I / O interface 308, which provides the UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. The I / O interface 308 is the communication path between these accessories and the controller / processor 307.

[0079] The controller / processor 307 is also coupled to input devices(s) 309 and a display 310. An operator of the UE 116 can use the input devices(s) 309 to input data into the UE 116. The display 310 may be a liquid crystal display (LCD) or another display capable of displaying text and / or at least limited graphics (such as from a website). Memory 311 is coupled to the controller / processor 307. A portion of memory 311 may include random access memory (RAM), while another portion of memory 311 may include flash memory or other read-only memory (ROM).

[0080] although Figure 3a An example of UE 116 is shown, but it is possible to... Figure 3a Make various changes. For example, Figure 3a The various components can be combined, further subdivided, or omitted, and additional components can be added as needed. As a specific example, the controller / 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). Furthermore, although... Figure 3a The UE116 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.

[0081] Figure 3b An example gNB 102 according to this disclosure is shown. Figure 3b The embodiment of gNB 102 shown is for illustrative purposes only, and Figure 1 Other gNBs can have the same or similar configurations. However, gNBs have a wide variety of configurations, and Figure 3b The scope of this disclosure is not limited to any particular implementation of the gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structures as gNB 102.

[0082] like Figure 3b As shown, gNB 102 includes multiple antennas 370a-370n, multiple RF transceivers 372a-372n, transmit (TX) processing circuitry 374, and receive (RX) processing circuitry 376. In some embodiments, one or more of the multiple antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0083] RF transceivers 372a-372n receive incoming RF signals, such as signals transmitted by the UE or other gNBs, from antennas 370a-370n. RF transceivers 372a-372n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 376, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 376 sends the processed baseband signals to controller / processor 378 for further processing.

[0084] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 378. The TX processing circuit 374 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a-372n receive the outgoing processed baseband or IF signal from the TX processing circuit 374 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 370a-370n.

[0085] The controller / processor 378 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 378 may control the reception of forward channel signals and the transmission of reverse channel signals via RF transceivers 372a-372n, RX processing circuitry 376, and TX processing circuitry 374, according to known principles. The controller / processor 378 may also support additional functions, such as more advanced wireless communication functions. For example, the controller / processor 378 may perform a BIS process, such as by a blind interference sensing (BIS) algorithm, and decode the received signal after subtracting interference. The controller / processor 378 may support any of a wide variety of other functions in the gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0086] The controller / processor 378 is also capable of executing programs and other processes, such as a basic operating system, residing in the memory 380. The controller / processor 378 is also capable of supporting channel quality measurement and reporting for systems having 2D antenna arrays as described in embodiments of this disclosure. In some embodiments, the controller / processor 378 supports communication between entities such as web RTCs. The controller / processor 378 is capable of moving data into or out of the memory 380 as needed for the execution of processes.

[0087] The controller / processor 378 is also coupled to a backhaul or network interface 382. The backhaul or network interface 382 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or over a network. The backhaul or network interface 382 is capable of supporting 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 or new radio access technologies or NR, LTE, or LTE-A), the backhaul or network interface 382 allows 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, the backhaul or network interface 382 allows the gNB 102 to communicate with a larger network (such as the Internet) via a wired or wireless local area network or via a wired or wireless connection. The backhaul or network interface 382 includes any suitable architecture supporting communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0088] Memory 380 is coupled to controller / processor 378. A portion of memory 380 may include RAM, while another portion may include flash memory or other ROM. In some embodiments, multiple instructions, such as a BIS algorithm, are stored in memory. The multiple instructions are configured to cause controller / processor 378 to perform the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0089] As described in more detail below, the transmit and receive paths of the gNB 102 (implemented using RF transceivers 372a-372n, TX processing circuitry 374, and / or RX processing circuitry 376) support aggregated communication with FDD and TDD cells.

[0090] although Figure 3b An example of gNB 102 is shown, but it is possible to compare it with other models. Figure 3b Various modifications can be made. For example, gNB102 can include any number of... Figure 3a Each component shown. As a specific example, the access point can include multiple backhaul or network interfaces 382, ​​and the controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, although shown as a single instance including TX processing circuitry 374 and a single instance including RX processing circuitry 376, the gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0091] The time unit (also called time cell) in the embodiments of this disclosure can be: an OFDM (Orthogonal Frequency Division Multiplexing) 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 Ns slots plus No OFDM symbols, etc. It can also be the duration of an OOK (On-Off Keying) chip.

[0092] The frequency domain unit (also called frequency unit) in the embodiments of this disclosure 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 bandwidth part (BWP), a bandwidth part group (composed of multiple BWPs), a bandwidth / carrier, a bandwidth 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.

[0093] Exemplary embodiments of this disclosure are further described below with reference to the accompanying drawings.

[0094] The text and accompanying drawings are provided by way of example only to aid the reader in understanding 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 may be made to the illustrated embodiments and examples without departing from the scope of this disclosure.

[0095] In wireless communication systems, transmission links mainly include: downlink communication links from the 5G gNB to the UE, and uplink communication links from the UE to the network. For example, in current wireless communication systems, nodes used for positioning measurements include: the UE initiating the positioning request message; the Location Management Function (LMF) used for UE positioning and distributing positioning assistance data; the gNB or Transmission-Reception Point (TRP) broadcasting positioning assistance data and performing uplink positioning measurements; and the UE used for downlink positioning measurements.

[0096] In addition, the solutions provided in this disclosure can also be extended to other communication systems, such as vehicle to X (V2X) communication, for example, sidelink communication, in which case the transmitting and receiving point or UE can be any device in the V2X system.

[0097] In wireless communication systems, the time slot for transmission from a base station (such as a gNB) to a UE is called a downlink time slot, and the time slot for transmission from a UE to a base station (such as a gNB) is called an uplink time slot.

[0098] In wireless communication systems, such as LTE or NR, a 2-step or 4-step random access procedure can be used to establish a link between the device and the base station. The base station periodically sends synchronization signals and the broadcast channel to the UE via a synchronization signal block (SSB / Physical Broadcast Channel, PBCH, or downlink reference signal). This period is called the synchronization signal block period (SSB periodicity) or the synchronization signal block group period (SSB burst periodicity). Simultaneously, the base station configures a random access channel configuration period (PRACH configuration period), within which a certain number of random access transmission opportunities (also called random access opportunities, PRACH transmission occasions, RO) are configured. This can also be understood as the base station configuring the Physical Random Access Channel (PRACH) via broadcast messages for the UE to perform random access.

[0099] Furthermore, in 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, random access is applied in various scenarios, including establishing an initial link, cell handover, re-establishing an uplink link, and RRC connection reconstruction. It is classified into contention-based random access and contention-free random access based on whether the UE has exclusive access to the preamble resource. In contention-based random access, each user selects a preamble sequence from the same preamble sequence resource and sends it to the base station during the uplink connection establishment process.

[0100] Random access is an important research area in communication systems, and improving the performance of user random access is a problem that urgently needs to be solved. The random access method provided in this disclosure can enhance the reliability of receiving random access responses and improve the performance of random access.

[0101] It should be noted that the problems that this disclosure can solve are not limited to those mentioned in the above and below descriptions, but can also solve all problems that can be practically solved based on the technical essence of this disclosure.

[0102] 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.

[0103] This disclosure provides a method executed by a UE in a communication system, such as... Figure 4 As shown, the method includes steps S410, S420, S430, etc. It should be noted that at least one of the above operations may be omitted, or additional operations may be included, such as one or more operations of the methods described in the embodiments of this disclosure.

[0104] In step S410, the UE receives first information, which is used to indicate the first random access resource; In this embodiment of the disclosure, for ease of description, random access associated with a specific feature (e.g., NES) (e.g., random access resources can be used for random access and the specific feature) can be referred to as "first type of random access" or simply "first random access," and the resources configured for the first random access can be referred to as "first random access resources" or simply "first type RO" or "first RO," or "first PRACH occasion," etc. Traditional random access can be referred to as "ordinary random access" or "second random access," and the resources corresponding to the second random access can be referred to as "ordinary random access resources" or "ordinary RO" or "second random access resources," or simply "second type RO" or "second RO," or "second PRACH occasion," etc.

[0105] In this embodiment of the disclosure, without changing the second random access resource, additional random access resources can be configured for other features (e.g., network energy saving (NES) features), such as the first random access resource, and random access can be performed when random access resources are configured for other features (e.g., NES) to improve the performance of random access.

[0106] The base station can adjust the first random access resource configured in the network and indicate this through first information to achieve network energy saving. Optionally, the first random access resource indicated by the first information is activated and / or deactivated.

[0107] In step S420, the UE sends a preamble on the first uplink resource, which is determined based on the first random access resource indicated by the first information; In this embodiment of the disclosure, the UE may select one of the first random access resources indicated by the first information as the first uplink resource to transmit a preamble (which may also be interchangeably referred to as a "preamble sequence" or "preamble code").

[0108] In step S430, if the UE receives the first downlink control information in the second time window, it will listen to the PDCCH (Physical Downlink Control Channel) based on the first RA-RNTI (Random Access-RNTI) to receive the random access response. The first downlink control information is used to indicate the first random access resource, and the first RA-RNTI is determined based on the first uplink resource and the first downlink control information.

[0109] In this embodiment of the disclosure, the UE can initiate a second time window after sending the preamble, during which the UE attempts to receive a random access response. The second time window can also be understood as the RAR detection window.

[0110] Optionally, the second time window can be obtained through random access to relevant configuration information.

[0111] In this embodiment of the present disclosure, when the UE is running in the second time window, it receives first downlink control information indicating the first random access resource. In order to avoid the conflict of RA-RNTI values ​​before and after the reception of the first downlink control information due to the change of the first random access resource indicated by the first downlink control information and / or its frequency index (also known as the frequency index), the UE can receive the random access response based on the first RA-RNTI. The first RA-RNTI is determined based on the first uplink resource and the first downlink control information, so as to be different from the second RA-RNTI determined based on the first uplink resource. This solves the problem of erroneous random access response caused by RA-RNTI conflict, reduces the probability of random access conflict, and improves the reliability of random access.

[0112] Furthermore, the random access method provided in this disclosure can adaptively configure PRACH resources according to energy-saving requirements, thereby reducing the energy consumption of base station PRACH detection without affecting the UE random access performance, which helps to achieve network energy saving.

[0113] This disclosure also provides further details of a method for random access in a system that has random access resources configured for other features (e.g., NES), such as random access configuration, random access resource determination, SSB-RO mapping (SSB-RO), etc.

[0114] It should be noted that PRACH may be used in this disclosure as an uplink channel associated with random access, but this is only an example. PRACH can also be replaced by other uplink channels, such as the Physical Uplink Shared Channel (PUSCH), the Physical Uplink Control Channel (PUCCH), etc.

[0115] In this embodiment of the disclosure, unless otherwise specified, the configuration information includes at least one of the following: information configured by the base station, information indicated in received signaling, information configured by higher layers, and pre-configured information. Further, it can be a set of configuration information obtained through the above methods, or multiple sets of configuration information obtained through the above methods. The UE or node can select one set of configuration information to use based on predefined conditions. Alternatively, it can be a set of configuration information obtained through the above methods, and this set of configuration information contains multiple subsets, from which the UE or node can select one subset to use based on predefined conditions.

[0116] In this embodiment of the disclosure, the first information and / or the first downlink control information may include at least one of the following: (1) Information on whether all of the first random access resources are activated; This can also be referred to as indication information related to whether the first random access resource is activated. For example, if the first random access resource is configured, it is activated; otherwise, it is either not activated or deactivated.

[0117] (2) At least one first random access resource activation or deactivation information; It can also be referred to as indication information related to the activation or deactivation of the first random access resource, which is used to determine whether the first random access resource is activated or deactivated in the configuration.

[0118] For example, the indication of whether a first random access resource is active or deactivated in the configuration can be made using a bit map, such as {0, 1, 1} representing that the first random access resource with index 0 is deactivated or not activated, and the first random access resources with indices 1 and 2 are activated; the index can be a time-domain index, a frequency index, or a time-frequency domain combined index.

[0119] In this embodiment of the disclosure, the first information and / or the first downlink control information (e.g., for cases including at least one first random access resource activation or deactivation information) includes at least one of the following: (1) Mask information of SSB and first random access resource activation mapping; For example, a PRACH mask, which indicates the first random access resource that is active or deactivated among one or more first random access resources associated with an SSB index. For example, the PRACH mask may be used to indicate that all first random access resources are available; or, the first random access resources with even numbers are available; or, the first random access resources with odd numbers are available; or, the first random access resource with number x is available (the range of number x is determined based on the frequency index range of the first random access resources, for example, it may be 0 to M1-1, where M1 is the number of first random access resources for frequency division multiplexing (FDM) used for the first random access).

[0120] (2) Periodic index of SSB and first random access resource activation mapping; This information can indicate whether a first random access resource is activated or deactivated within a certain time period, such as the mapping ring of SSB-first RO or the mapping period index of SSB-first RO, etc., to indicate one or more mapping periods of SSB-first RO, in which the first random access resource is activated or deactivated. For example, index 0 or 1 can indicate whether the first random access resource is activated or deactivated within the first mapping period of SSB-first RO.

[0121] (3) PRACH associated periodic index; This information can also indicate whether a first random access resource is activated or deactivated within a certain time period. For example, it can indicate one or more PRACH association periods (SSB - First Type RO Association Period Index) in which the first random access resource is activated or deactivated. For example, index 0 or 1 can indicate whether the first random access resource is activated or deactivated within the first PRACH association period.

[0122] (4) PRACH association pattern periodic index; This information can also indicate whether a first random access resource is activated or deactivated within a certain time period. For example, it can indicate one or more PRACH association mode periods (SSB-Type 1 RO association mode period) in which the first random access resource is activated or deactivated. For example, index 0 or 1 can indicate whether the first random access resource is activated or deactivated within the first PRACH association mode period.

[0123] (5) At least one fourth RA-RNTI; In this embodiment of the disclosure, the fourth RA-RNTI can also be understood as a dedicated RA-RNTI, which can be determined by indicating one or more dedicated RA-RNTIs, which are used to determine the activated first random access resource; optionally, the dedicated RA-RNTI can be obtained based on the calculation formula of the protocol's RA-RNTI.

[0124] (6) Refer to the number of fourth RA-RNTIs and fourth RA-RNTIs; In this embodiment of the disclosure, a reference fourth RA-RNTI, also referred to simply as reference RA-RNTI, and a first quantity, and a third quantity are used to indicate the number of fourth RA-RNTIs, wherein the first quantity of fourth RA-RNTIs can be consecutive fourth RA-RNTIs, the starting fourth RA-RNTI of the consecutive fourth RA-RNTI is the reference fourth RA-RNTI, and the ending fourth RA-RNTI is the reference fourth RA-RNTI + the first quantity - 1; for example, if the reference fourth RA-RNTI is 1000 and the first quantity is 3, then the indicated fourth RA-RNTI is {1000, 1001, 1002}.

[0125] The advantage of using the fourth RA-RNTI to indicate the activation of the first random access resource is that, since the fourth RA-RNTI is determined based on the time-frequency domain resources of the random access resource, given a fourth RA-RNTI, the UE can uniquely determine a random access resource. The method of indicating the activation or deactivation of the first random access resource through RA-RNTI is simple, easy to implement, and requires little modification to the protocol.

[0126] (7) Time unit index; This information can also indicate whether a first random access resource is activated or deactivated within a certain time period.

[0127] Optionally, the time unit index may indicate the system frame number (SFN, also known as the radio frame number) of the first activated random access resource, which is used to indicate one or more radio frames in which the first random access resource is activated or deactivated. For example, SFN 0 may indicate that the first random access resource in the first radio frame is activated or deactivated.

[0128] Optionally, the time unit index may indicate the slot index of the activated first random access resource, indicating one or more slots in which the first random access resource is activated or deactivated.

[0129] Optionally, the time unit index may indicate the symbol index of the first active random access resource, for indicating one or more symbols, the first random access resource of which is activated or deactivated.

[0130] (8) Frequency unit index; This information can indicate whether a first random access resource is active or deactivated within a certain frequency domain range. For example, the frequency element index can indicate the BWP index, subcarrier index, PRB index, etc., of the active first random access resource, used to indicate whether the corresponding first random access resource is active or deactivated.

[0131] In this embodiment of the disclosure, the first information includes random access-related configuration information and / or downlink control information.

[0132] In one optional implementation, the random access-related configuration information includes one or more of the following: (1) Configuration information related to the time domain of random access resources, including one or more of the following: 1. Time-domain related configuration information of the first random access resource, including one or more of the following combinations: 1) Random access configuration (e.g., PRACH configuration) index for the first random access (e.g., the higher-layer parameter prach-ConfigurationIndex, which determines the random access preamble format, random access configuration period (also known as the first random access period), the number and position of random access frames in the random access configuration period, the index of a subframe or time slot in a random access frame, the start symbol position of the random access preamble in a subframe or time slot, the number of random access time slots in a random access subframe, the number of ROs in a random access time slot, the number of OFDM symbols occupied in a RO, etc.). 2) The association period of SSB-first RO (SSB and first random access resource mapping); 3) The correlation pattern cycle of SSB-first RO; 2. Time-domain related configuration information of the second random access resource, such as the random access configuration index; the mapping ring of SSB-second RO (SSB and second random access resource mapping); the association period of SSB-second RO; the association pattern period of SSB-second RO, etc. The time-domain related configuration information of the second random access resource can be different from that of the first random access resource. For example, the random access configuration index is not equal to the random access configuration index in the time-domain related configuration information of the first random access resource. (2) Configuration information related to the frequency domain of random access resources, including one or more of the following: 1. The number of ROs in Frequency Division Multiplexing (FDM) (which can be written as the total number of ROs, or the number of random access resources in the frequency domain, such as the higher-layer parameter msg1-FDMTotal). This number of ROs is the number of frequency domain ROs in one random access time unit, including the first RO and the second RO. 2. Frequency domain-related configuration information of the first random access resource, including one or more of the following combinations: 1) Random access preamble root sequence index used for the first random access; 2) The number of random access preambles used for the first random access, for example, the number of preambles used for the first random access on a first RO; 3) The number of first ROs used for the first random access (FDM) (which can be written as, for example, higher layer parameter msg1-FDM2, or as the number of frequency domain resources for the first random access resource). 4) The frequency start (location) of the first RO for the first random access (e.g., the higher-layer parameter msg1-FrequencyStart2, or, written as the frequency start offset of the first RO), is used to determine the offset of the lowest first RO in the frequency domain, corresponding to PRB 0. This value is configured so that the corresponding first RO is entirely within the bandwidth of the Uplink Bandwidth Part (UL BWP). The frequency start position of the first RO also refers to the frequency start position of the first first RO. ROs at other frequency domain locations are calculated based on the position of the first first RO, the size of the frequency domain resources occupied by the RO, and / or the frequency domain spacing between ROs. 5) Frequency offset for the first RO used for the first random access, which is a frequency offset relative to the starting frequency of the second RO, and may be one or more frequency domain units; 3. Frequency domain configuration information of the second random access resource, including the number of second ROs in frequency division multiplexing (FDM) (e.g., higher layer parameter msg1-FDM, or written as the number of frequency domain resources of the second random access resource); the frequency start (position) of the second RO (or, written as the frequency start offset of the second RO, e.g., higher layer parameter msg1-FrequencyStart), used to determine the offset of the lowest second RO in the frequency domain, corresponding to PRB 0 respectively; (3) Configuration information related to the first random access power, including at least one of the following: the target received power of the preamble for the first random access; the path loss compensation coefficient alpha for the first random access (e.g., alpha × path loss, where alpha is less than 1, indicating partial path loss compensation; alpha = 1, indicating full path loss compensation; alpha > 1, indicating excess path loss compensation. This configuration is beneficial when using the ordinary target received power of the preamble, as it can additionally increase the power of the UE when transmitting the preamble on the first RO); the power increase difference (e.g., delta value) for the first random access; the power ramping priority and / or power step size for the first random access; the number threshold related to the first RO, etc., where the number threshold is used to determine the value of the power step size; Optionally, when the UE uses the first RO to transmit the preamble, the above-mentioned first RO dedicated power-related configuration is used; the transmission power P is determined based on one or more of the target received power P0, alpha × path loss, delta, power ramp-up step size × number of retransmissions. (4) First information; It can also be referred to as configuration information related to the activation or deactivation of the first random access resource, such as the above-mentioned indication information related to whether the first random access resource is activated and / or the above-mentioned indication information related to the activation or deactivation of the first random access resource. (5) Indication information on whether only the first active random access resource (which can be written as the first active RO) can be used; (6) Indication information on whether to prioritize the use of the first active random access resource (which can be written as the first active RO); (7) The ratio of SSB to first RO mapping (SSB-first RO) (e.g., information indicating how many SSBs are mapped on a first RO, see, for example, the higher-level parameter ssb-perRO). (8) Second time window, which can be multiple time units (e.g., time slots); (9) Preamble transmission number threshold: When the number of times the preamble is transmitted on the first random access resource exceeds this threshold, the UE chooses to transmit the preamble on the second random access resource.

[0133] Optionally, the configuration information related to random access can be divided into first configuration information related to the first random access and second configuration information related to the second random access, based on the relationship with the random access resource type. For example, a combination of one or more of the above may include first configuration information and second configuration information. The specific information is subject to the actual content, and will not be described in detail here.

[0134] In this embodiment of the disclosure, the UE can receive random access-related configuration information through at least one of the following methods: (1) PDCCH command; such as DCI (Downlink Control Indicator).

[0135] (2) MAC (Medium Access Control) control element (CE).

[0136] (3) RRC high-level signaling.

[0137] In this embodiment of the disclosure, the first information may also be downlink control information (to distinguish it from the first downlink control information mentioned above, it will be referred to as the second downlink control information below). The content of the second downlink control information can be found in the above description of the first information, and will not be repeated here.

[0138] Optionally, the second downlink control information can be obtained through at least one of the following methods: PDCCH (such as DCI), MAC CE, RRC higher-level signaling, etc.

[0139] It is understood that the first downlink control information can be similar to the second downlink control information, and can be downlink control information with the same format and type, that is, the two contain the same fields. For related content and processing, please refer to the introduction of the second downlink control information, which will not be repeated here.

[0140] In this embodiment of the disclosure, the first downlink control information / second downlink control information can be used for a first type of UE, and the random access related configuration information can be used for both the first type of UE and the second type of UE. For example, the first type of UE can be a UE that supports NES features, or the first type of UE can be a UE of a first version (e.g., the first version is not lower than version 19 or written as Rel 19); the second type of UE can be a UE that does not support NES features, or the second type of UE can be a UE of a second version (e.g., not the first version).

[0141] In this embodiment of the disclosure, the physical downlink control channel including the first information and / or the physical downlink control channel including the first downlink control information can be transmitted in a first search space (set), the first search space including at least one of the following: (1) Public search space, such as Type0 PDCCH CSS or Type1 PDCCH CSS; (2) UE-specific search space; (3) Receive information on activating or deactivating the first random access resource in a dedicated search space.

[0142] Optionally, the format of the first downlink control information can be format 1_0, 1_1, 2_7, 2_9, etc., or a format specifically used for activating or deactivating downlink control information.

[0143] Optionally, when the first search space (set) is a UE-specific search space, or when the information for receiving activation or deactivation of the first random access resource is a UE-specific search space, the first downlink control information can be scrambled based on the fifth RNTI. The fifth RNTI can be C-RNTI (Cell-RNTI, Temporary Cell Radio Network Identifier) ​​or TC-RNTI (Temporary Cell-RNTI, Temporary Cell RNTI). Optionally, when the first search space (set) is a common search space, the fifth RNTI may also be at least one of the following: P-RNTI (Paging-RNTI); SI-RNTI (System Information-RNTI); CellDTRX-RNTI (Cell Discontinuous Transmission And Reception-RNTI); PEI-RNTI (paging early indication-RNTI).

[0144] Optionally, if the first search space includes a search space dedicated to receiving information for activating or deactivating the first random access resource, the first search space may be scrambled using RNTI based on NES characteristics.

[0145] In some implementations, when the first search space (set) is dedicated to receiving search spaces used to activate or deactivate the first random access resource, the fifth RNTI may also be an RNTI dedicated to the second feature. The second feature may be, for example, a network energy saving (NES) feature, but is not limited to this feature. The RNTI dedicated to the second feature may be preset by the protocol or configured through RRC higher-layer signaling.

[0146] It should be noted that the first downlink control information being scrambled by the fifth RNTI specifically refers to the CRC (Cyclic Redundancy Check) of the PDCCH transmitting DCI being scrambled based on the fifth RNTI.

[0147] In this embodiment of the disclosure, the activated first random access resource can be determined based on random access-related configuration information, or it can be determined based on random access configuration information and downlink control information (such as second downlink control information or first downlink control information).

[0148] In this embodiment of the disclosure, the method for determining the activated first random access resource based on random access-related configuration information may be based on the time-domain related information and frequency-domain related information of the first random access resource included in the random access-related configuration information, as well as first information (such as configuration information related to the activation or deactivation of the first random access resource).

[0149] In this embodiment of the disclosure, the method for determining the activated first random access resource based on random access-related configuration information and downlink control information may be based on the time-domain related information and frequency-domain related information of the first random access resource included in the random access-related configuration information, and the first information (such as indication information related to whether the first random access resource is activated) included in the downlink control information (such as the second downlink control information).

[0150] In this embodiment of the disclosure, the method for determining the activated first random access resource based on random access-related configuration information and downlink control information can also be based on the time-domain related information and frequency-domain related information of the first random access resource included in the random access-related configuration information, and the first information (such as indication information related to activation or deactivation of the first random access resource) included in the downlink control information (such as the second downlink control information).

[0151] In this embodiment, after the UE receives the random access related configuration information, it receives second uplink control information. If the first information included in the random access related configuration information (such as an indication of activation or deactivation of the first random access resource) and the first information included in the uplink control information (such as the second uplink control information) are different, the UE uses the first information included in the uplink control information, or the UE ignores the first information included in the random access related configuration information and uses the first information included in the uplink control information. The advantage is that the UE avoids random access failures caused by the inconsistency between the indication of activation or deactivation of the first random access resource included in the random access related configuration information and the uplink control information, which could lead to the UE being unable to correctly select the activated first random access resource and causing high random access latency.

[0152] In this embodiment, after the UE receives uplink control information (such as second uplink control information), it receives random access related configuration information. If the first information included in the random access related configuration information (such as indication information for activating or deactivating the first uplink resource) is different from the first information included in the uplink control information, the UE uses the first information included in the random access related configuration information, or the UE ignores the first information included in the uplink control information and uses the first information included in the random access related configuration information. The advantage is that the UE avoids random access failures caused by the inconsistency between the random access related configuration information and the indication for activating or deactivating the first random access resource included in the uplink control information, which could lead to the UE being unable to correctly select the activated first random access resource and causing high random access latency.

[0153] In one optional implementation, the ROs that can be obtained based on the random access-related configuration information include a first RO and a second RO.

[0154] Optionally, the UE can determine the activated or deactivated first random access resource (first RO, also referring to physical random access channel resource, PRACH timing) based on random access-related configuration information and second downlink control information (or first downlink control information). Specifically, the first RO and the second RO are valid ROs determined according to a predetermined validity rule. For example, the validity rule may include: an RO on a random access slot (PRACH slot) is a valid RO if it is on an uplink symbol (or uplink portion) in the TDD configuration pattern; an RO on a random access slot is a valid RO if it is not earlier than the SSB in that slot and / or if the RO is at least N symbols after the last downlink symbol and / or the last SSB symbol in the current slot. In this embodiment of the disclosure, unless otherwise specified, the first RO and the second RO involved are both valid ROs. The UE can transmit a random access preamble on the determined valid RO.

[0155] Optionally, among the indicated ROs, valid ROs can be determined based on the RO validity determination method. A valid RO is one that satisfies the requirement that all SSBs can be mapped to their corresponding valid ROs within the association period (a certain time period or length). In an SSB-to-RO mapping loop, all SSBs within an SSB period are mapped to the required random access resources. An association period can have one or more mapping loops. An SSB-to-RO association pattern period contains one or more association periods, and the SSB-to-RO association pattern is identical in each association pattern period.

[0156] In this embodiment of the disclosure, when the UE sends a preamble on the first RO for random access, it will not affect the UE that performs random access on the second RO determined only based on the configuration information related to random access.

[0157] In this embodiment of the disclosure, the mapping relationship between the SSB and the first RO can be a predetermined mapping rule or mapping order. For example, the predetermined mapping rule or mapping order may include: first, in the RO of a random access time slot, the SSB index is mapped in ascending order of the preamble index; second, in the frequency domain, the SSB index is mapped to the frequency division multiplexing RO in ascending order; third, the SSB index is mapped to the time division multiplexing RO of the same random access time slot in the time domain; and finally, the SSB index is mapped in the next random access time slot.

[0158] In one alternative implementation, the SSB can be mapped to a third RO and a first RO, where the third RO is a second RO that is not used for PRACH transmission. Optionally, the second RO not used for PRACH transmission is: a second RO that is not mapped to the Index_ssb SSB index during the association period, where Index_ssb is the ssb-PositionsInBurst (SSB location information) value obtained by the UE from SIB1 (System Information Block 1) or ServingCellConfigCommon (Serving Cell Common Configuration); and / or, the second RO not used for PRACH transmission is a second RO that is not associated with the SSB index after a second number of association periods, wherein the second number can be the smallest integer in a set determined based on the PRACH configuration period, and the set can be determined based on the PRACH configuration period, for example, when the PRACH configuration period is 10, the set is {1, 2, 4, 8, 16, 32, 64}; or, when the period is 20, the set is {1, 2, 4, 8, 16, 32}.

[0159] In this embodiment of the disclosure, the configuration information related to the first random access resource can be used for four-step random access configuration or for two-step random access configuration. The example embodiment of this disclosure uses a four-step random access configuration as an example to illustrate the method. However, the embodiments of this disclosure are not limited to this and can be extended or replaced with random access configurations for other features.

[0160] In this embodiment of the disclosure, the frequency index of the first random access resource can be determined based on random access-related configuration information, or it can be determined based on random access-related configuration information and downlink control information (such as second downlink control information or first downlink control information).

[0161] In this embodiment of the disclosure, the frequency index of the first random access resource can be determined based on the configured first random access resource, and the frequency index of the first uplink resource and / or the frequency index of the second uplink resource can be determined based on the frequency index of the first random access resource determined in this way (for example, the frequency index of the first random access resource determined in this way will not change because the first random access resource is activated or deactivated).

[0162] Optionally, the frequency index of the first random access resource (which may also be written as the frequency domain index, frequency index, frequency domain number, or frequency number of the first RO) is determined based on at least one of the following methods: (1) Determined based on the frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource; (2) Determined based on the frequency start position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource; (3) Determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource; (4) Determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resource; (5) Determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources.

[0163] For example, the first random access resource can be a physical random access channel frequency domain resource (PRACH frequency domain resource) with a frequency number of n_RA∈{0,1,...,M-1}, where M is the total number of random access frequency domain resources in a random access time unit.

[0164] In this embodiment of the disclosure, the frequency starting position of the first random access resource may be determined according to one or more of the following methods: (1) Obtain the frequency domain start (position) of the first random access resource based on the configuration information related to random access; (2) The frequency start (position) of the second random access resource obtained based on the configuration information related to random access is used as the frequency domain start (position) of the first random access resource. (3) Based on the frequency start (position) of the second RO obtained from the configuration information related to random access, and the frequency domain offset of the frequency start position of the first random access resource relative to the second random access resource, determine the frequency domain start (position) of the first random access resource.

[0165] In this embodiment of the disclosure, the number of frequency domain resources of the first random access resource may be determined according to one or more of the following methods: (1) The total number of frequency domain resources of the random access resources obtained based on the random access-related configuration information (e.g., msg1-FDMTotal) and the number of frequency domain resources of the second random access resources (e.g., msg1-FDM) are determined; The number of frequency domain resources of the first random access resource is the difference between the total number of frequency domain resources of the random access resource and the number of frequency domain resources of the second random access resource. For example, if the total number of frequency domain resources of the random access resource is 6 and the number of frequency domain resources of the second random access resource is 3, then the number of frequency domain resources of the first random access resource is “msg1FDMTotal” – “msg1FDM” = 6 - 3 = 3.

[0166] It should be noted that the total number of frequency domain resources of the random access resources is greater than or equal to (not less than) the number of frequency domain resources of the second random access resources (or the number of frequency domain resources of the second random access resources is less than or equal to (not greater than) the total number of frequency domain resources of the random access resources). (2) Obtain the number of frequency domain resources of the first random access resource (e.g., msg1-FDM2) based on the configuration information related to random access.

[0167] In this embodiment of the disclosure, the total number of frequency domain resources for random access can be determined according to one or more of the following methods: (1) Determine based on the total number of frequency domain resources of random access resources included in the random access-related configuration information (e.g., msg1-FDMTotal); The total number of frequency domain resources in the random access resource is the number of frequency domain random access resources in one random access time unit. Here, the frequency domain random access resources include the first random access resource and the second random access resource.

[0168] (2) The number of frequency domain resources of the first random access resource (e.g., msg1-FDM2) and the number of frequency domain resources of the second random access resource (e.g., msg1-FDM) obtained from the configuration information related to random access are determined, for example, as the sum of msg1-FDM2 and msg1-FDM.

[0169] In this embodiment of the disclosure, the frequency index of the first random access resource can be determined based on the configured first random access resource.

[0170] In one alternative implementation, the minimum frequency index of the first random access resource is greater than the maximum frequency index of the second random access resource. The maximum frequency index of the second random access resource is determined based on the number of frequency domain resources of the second random access resource. Starting from the frequency starting position of the first random access resource, the frequency index of the first random access resource is ordered in ascending order from low to high frequency based on the number of frequency domain resources of the first random access resource.

[0171] Specifically, the frequency indexing method for the first random access resource can be within the uplink bandwidth portion that does not include the second random access resource (e.g., Figures 5a-5c The first random access resource shown can be located on one side of the uplink bandwidth portion of the second random access resource (e.g., Figure 5a and Figure 5c (as shown) or both sides (such as) Figure 5b As shown), if located on both sides, the frequency index of the first random access resource can skip the uplink bandwidth portion of the second random access resource. The frequency index of the first random access resource (also written as the frequency index of the first RO) starts from the lowest frequency of the first random access resource (i.e., the starting frequency domain of the first random access resource) and is numbered in ascending order. The starting index of the frequency index of the first random access resource is equal to or greater than (not less than) the number of frequency domain resources of the second random access resource (or, in other words, the starting index of the frequency index of the first random access resource is equal to or greater than (not less than) the maximum frequency index of the second random access resource, where the maximum frequency index of the second random access resource is determined based on the number of frequency domain resources of the second random access resource included in the frequency domain-related configuration information). For example... Figures 5a-5c In the second random access resource, the number of frequency domain resources is 2, the maximum frequency index of the second random access resource is #1, the first random access resource is numbered in ascending order from #2 onwards in the bandwidth portion outside the uplink bandwidth portion of the second random access resource, the number of frequency domain resources of the first random access resource is 4, then the frequency indexes of the first random access resource are #2 to #6.

[0172] This indexing method can be understood as a common indexing method. The advantage of this indexing method is that by using a frequency domain joint indexing method for the first RO and the second RO of frequency division multiplexing (time domain overlap), it can solve the problem of random access failure caused by the same RA-RNTI calculation result associated with the first RO and the second RO of frequency division multiplexing (time domain overlap). This helps to improve the UE random access success rate and reduce the random access latency.

[0173] In another alternative implementation, the frequency index of the first random access resource is determined based on the following formula:

[0174] in, This indicates the frequency domain location number of the first random access resource (which can be simply referred to as the first frequency number for ease of description). , , This indicates the number of frequency domain resources for the first random access resource (e.g., msg1-FDM2). This indicates the total number of frequency domain resources (e.g., msg1-FDMTotal). This indicates a modulo operation, for example, MOD(4,5)=4, MOD(5,5)=0.

[0175] Optionally, the first frequency number Sort from left to right according to the frequency of the first random access resource in ascending order, where , Corresponding to the lowest frequency index, The index corresponding to the highest frequency.

[0176] This indexing method can also be understood as a common indexing method. The advantage of this frequency indexing method for the first random access resource is that it can solve the problem of RA-RNTI inconsistency caused by the change in frequency domain logical index due to the adaptation of the first random access resource, thereby improving the success rate of random access and reducing the latency of random access.

[0177] Wherein, the first frequency number is the frequency domain position number corresponding to the first random access resource in the frequency domain position number of the random access frequency domain resource. Here, the random access frequency domain resource includes the first random access resource and the second random access resource, and the frequency domain position number of the random access frequency domain resource is the frequency domain position number of the random access frequency domain resource. Starting from the lowest frequency, the uplink bandwidth is obtained in ascending order.

[0178] The following is based on Figure 6b Let's take an example to illustrate this. Figure 6a and Figure 6c This can be deduced similarly and will not be elaborated further. The number of random access frequency domain resources is M=6, including K=4 first ROs and 2 second ROs. The frequency index of the second ROs is obtained by starting from the lowest frequency of the second RO in the uplink bandwidth portion and numbering in ascending order, i.e., {0,1}, where the frequency of the second RO corresponding to index 1 is greater than the frequency of the second RO corresponding to index 1. The frequency index of the first RO can be obtained by starting from the lowest frequency of the random access resources in the uplink bandwidth portion (in this example, the lowest frequency of the first RO), and numbering the first ROs in ascending order (including the second ROs) to obtain the frequency index {0, 1, 4, 5}, which is the first frequency number. ={ , , , }={0,1,4,5}, where k=0,1,..,K-1=0,1,2,3, then according to the formula The results are obtained by sorting the frequencies of the first RO from left to right in ascending order. Figure 6b The indexing method shown.

[0179] In another alternative implementation, the frequency index h of the first random access resource can also be determined based on the frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource. This indexing method can be understood as a separate indexing method.

[0180] Specifically, such as Figure 7 As shown, the frequency indexing method for the first random access resource can be within the uplink bandwidth portion that does not include the second random access resource (e.g., the uplink bandwidth portion). Figure 7 The frequency index of the first random access resource (shown in the figure) starts from the lowest frequency of the first random access resource (i.e., the starting position of the frequency of the first random access resource) and is numbered in ascending order, wherein the starting index of the frequency index of the first random access resource is #0.

[0181] In this embodiment of the disclosure, the frequency index of the first random access resource can be determined based on the activated first random access resource.

[0182] Optionally, the first information indicates that the first random access resource is activated and / or deactivated, and the frequency index of the activated first random access resource is determined based on at least one of the following methods: (1) Determined based on the frequency starting position of the activated first random access resource and the number of frequency domain resources of the activated first random access resource; (2) Determined based on the frequency start position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the activated first random access resource; (3) Determined based on the frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the number of frequency domain resources of the second random access resource; (4) Determined based on the frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the total number of frequency domain resources of the random access resources; (5) Determined based on the frequency starting position of the activated first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources.

[0183] In one alternative implementation, such as Figure 8 As shown, the frequency index of the first random access resource is determined as follows: within the uplink bandwidth portion that does not include the second random access resource, the frequency index of the first random access resource starts from the lowest frequency of the activated first random access resource (i.e., the frequency start of the first random access resource), and the frequency domain resources of the activated first random access resource are numbered in ascending order. The starting index of the frequency index of the first random access resource is equal to or greater than (not less than) the number of frequency domain resources of the second random access resource (or the starting index of the frequency index of the first random access resource is equal to or greater than (not less than) the maximum index of the frequency domain of the second random access resource, wherein the maximum index of the frequency domain of the second random access resource is determined according to the number of frequency domain resources of the second random access resource included in the configuration information related to the frequency domain of the random access resource). The advantage of this indexing method is that by using a joint frequency domain indexing method for the first RO and the second RO of frequency division multiplexing with time domain overlap, the problem of random access failure caused by the same RA-RNTI calculation result associated with the first RO and the second RO of frequency division multiplexing (time domain overlap) can be solved, which helps to improve the UE random access success rate and reduce the random access latency.

[0184] In another alternative implementation, such as Figure 9 As shown, the frequency index of the first random access resource can also be determined as follows: ,in, For modulo operations, for example, MOD(4,5)=4, MOD(5,5)=0. , , Let P be the frequency domain location number of the first random access resource (for ease of description, it can be simply referred to as the first frequency number), P be the number of frequency domain resources of the activated first random access resource, and M be the number of frequency domain resources of the random access resource (including the activated first RO and second RO); specifically, the first frequency number... The numbers are sorted from left to right according to the frequency of the first activated random access resource in ascending order. , Corresponding to the lowest frequency index, The frequency index of the first random access resource corresponds to the highest frequency index. The advantage of this frequency indexing method is that it can solve the problem of RA-RNTI inconsistency caused by the change of frequency domain logical index due to the adaptation of the first random access resource, thereby improving the success rate of random access and reducing the latency of random access.

[0185] Wherein, the first frequency number is the frequency number corresponding to the active first RO in the frequency number of the random access frequency domain resource, the random access frequency domain resource includes the active first RO and the second RO, and the frequency number of the random access frequency domain resource is the random access frequency domain resource. Starting from the lowest frequency, the uplink bandwidth is obtained in ascending order.

[0186] In yet another alternative implementation, such as Figure 10 As shown, the frequency index of the first random access resource can be determined by including the uplink bandwidth portion that does not include the second random access resource (e.g., within the uplink bandwidth portion). Figure 10 The frequency index of the first random access resource (shown in the figure) starts from the lowest frequency of the activated first random access resource (i.e., the starting position of the frequency of the first random access resource) and numbers the frequency domain resources of the activated first random access resource in ascending order, wherein the starting index of the frequency index of the first random access resource is #0.

[0187] Optionally, the link bandwidth portion in at least one of the above embodiments may be an initial uplink bandwidth portion or an active uplink bandwidth portion. Optionally, during initial access, the uplink bandwidth portion is the initial uplink bandwidth portion; otherwise, the uplink bandwidth portion is the active uplink bandwidth portion.

[0188] Optionally, the lowest frequency in at least one of the above embodiments may be a combination of one or more of the following: (1) The frequency start of the first random access resource obtained based on the configuration information related to random access; (2) The frequency start of the second random access resource obtained based on the configuration information related to random access; (3) The smaller of the frequency start of the first random access resource and the frequency start of the second random access resource obtained from the configuration information related to random access.

[0189] Optionally, if the frequency start of the first random access resource and the frequency start of the second random access resource are the same, the minimum frequency is either one of them.

[0190] In this embodiment of the disclosure, the sum of the number of frequency domain resources of the first random access resource (e.g., msg1-FDM2) and the number of frequency domain resources of the second random access resource (e.g., msg1-FDM) is not greater than the maximum value of the number of frequency domain resources of the second random access resource (msg1-FDM) (e.g., 8). The advantage is that it does not affect the calculation of RA-RNTI in the standard, and the standard modification is small.

[0191] As an example, the number of frequency domain resources of the first random access resource can be implicitly indicated, for example, based on the number of frequency domain resources of the second random access resource (such as msg1-FDM) and the maximum number of frequency domain resources of the second random access resource (such as 8), the maximum number of frequency domain resources of the first random access resource can be determined.

[0192] In this embodiment of the disclosure, the first uplink resource is the first available first random access resource among the activated first random access resources; and / or, the first uplink resource is selected from the configured second random access resource and the activated first random access resource according to a first criterion; and / or, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource.

[0193] Optionally, if the random access related configuration information includes an indication of whether only the activated first random access resource can be used, the UE selects the first available first random access resource or selects a random access resource according to the first criterion; otherwise, the UE selects the second random access resource and the first available first random access resource among the activated first random access resources.

[0194] In this embodiment of the disclosure, the first criterion includes at least one of the following: (1) If the second random access resource and the activated first random access resource are time-division multiplexed (e.g., the first RO and the second RO do not overlap in the time domain), the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource, and the UE selects the first available RO among the second RO and the activated first RO as the first uplink resource. (2) If the second random access resource and the activated first random access resource are frequency division multiplexing (e.g., the first RO and the second RO are in the same time unit, but the frequency domains do not overlap), the first uplink resource is the first available first random access resource among the activated first random access resources, and the UE may preferentially select the first available RO among the first RO as the first uplink resource.

[0195] Optionally, if the first uplink resource is included in the second random access resource and the activated first random access resource, the second random access resource is the second random access resource configured that is not associated with the SSB index during the association period; and / or, the second random access resource that is not associated with the SSB index after an integer number of association periods.

[0196] The embodiments disclosed herein can reduce the probability of random access conflicts between UEs configured with a first RO and UEs not configured with a first RO, improve the success rate of random access for UEs, and reduce random access latency.

[0197] In this embodiment of the disclosure, step S430 may specifically include at least one of the following: After receiving the first downlink control information, within the first time interval, the PDCCH is monitored based on the first RA-RNTI to receive random access responses within the second time window. Within a first time interval after receiving the first downlink control information, the PDCCH is monitored based on the second RA-RNTI to receive random access responses. The second RA-RNTI is determined based on the first uplink resource. The first time interval is the effective time interval for the first downlink control information.

[0198] Optionally, if the first random access resource indicated by the first information and the first random access resource indicated by the first downlink control information are different, the UE may listen to the PDCCH based on the first RA-RNTI within the second time window to receive the random access response.

[0199] Optionally, the PDCCH is monitored based on the first RA-RNTI for receiving random access responses within the second time window when at least one of the following conditions is met: (1) The frequency index of the first uplink resource is not equal to the frequency index of the second uplink resource; (2) Regarding the first downlink control information indicating that the first uplink resource has been deactivated; The second uplink resource has the same frequency position as the first uplink resource, and / or the index s_id of the first OFDM symbol of the second uplink resource and the index t_id of the first time slot of the second uplink control resource in the system frame are the same as those of the first uplink resource.

[0200] Optionally, the UE may listen to the PDCCH for receiving a random access response based on the first RA-RNTI within the second time window if at least one of the following conditions is met: no PDCCH is listened to; and / or the PDCCH is listened to, but the SFN field LSB (Least Significant Bit) of the listened PDCCH is different from the corresponding LSB of the SFN of the first uplink resource.

[0201] As an example, through Figure 11An example of a UE receiving a random access response is shown. UE1 sends a PRACH. If UE1 sends a preamble (msg1) on the first RO1 (first uplink resource), the UE attempts to detect the DCI format 1_0 of the corresponding RA-RNTI (second RA-RNTI, determined based on the first RO1) scrambling code during the window configured by higher-layer signaling (i.e., the second time window). Within the first time window (the start time is the same as the second time window), UE1 does not receive msg2 sent to UE1 based on the second RA-RNTI, but UE1 receives the first downlink control information. After a first time interval, the first downlink control information becomes effective. Then, within a third time window, UE1 will receive msg2 (random access response) based on the first RA-RNTI. The start time of the first time interval is the time after receiving the first downlink control information. After the time interval after the first downlink control information becomes effective, the third time window starts. The end time of the third time window is the end time of the second time window.

[0202] After receiving the first downlink control information, UE2 sends msg1 on the first RO2 and receives Msg2 within the RAR receive window based on the third RA-RNTI, which is determined based on the first RO2. Because the RA-RNTI (second RA-RNTI) based on the first RO1 and the RA-RNTI (third RA-RNTI) based on the first RO2 may have the same value due to changes in frequency domain index, UE1 can avoid conflict by receiving msg2 based on the first RA-RNTI. Specifically, when UE2 receives msg2 sent to UE1, since msg2 is sent based on the first RA-RNTI, UE2 will not decode msg2 sent to UE1 based on the third RA-RNTI. This solves the problem of UEs decoding other UEs' msg2 due to RA-RNTI conflicts, reduces the probability of random access conflicts, and improves the reliability of random access.

[0203] Optionally, the UE initiates a second time window, which begins with the first symbol of the earliest CORESET (Control Resource Set) of the PDCCH received from the Type1-PDCCH CSS (common search space) set. This symbol must have at least one symbol following the last symbol of the last PRACH moment corresponding to the PRACH transmission, and its symbol duration corresponds to the SCS (subcarrier spacing) of the Type1-PDCCH CSS set. Based on the SCS of the Type1-PDCCH CSS set, the length of the second time window, expressed in terms of time slots, is provided by the higher-layer signaling ra-ResponseWindow (random access response window).

[0204] During or within the second time window, if the UE meets at least one of the following conditions (referred to as the first condition), it can receive msg2 based on the first RA-RNTI: (1) The first downlink control information is received, and prior to this, the UE has not detected DCI format 1_0 scrambled based on the second RA-RNTI; (2) The UE detects the first downlink control information or the format of the first downlink control information based on the fifth RNTI scrambling, and the UE does not detect the DCI format 1_0 based on the second RA-RNTI scrambling; (3) The UE receives the first downlink control information, and prior to that, it detects DCI format 1_0 scrambled based on the second RA-RNTI, but the LSB of the SFN field in DCI format 1_0 (if included and applicable) is different from the corresponding LSB of the SFN of the UE sending PRACH (first RO1); (4) The UE detects the first downlink control information or the format of the first downlink control information based on the fifth RNTI scrambling, and prior to this, it detects the DCI format 1_0 based on the second RA-RNTI scrambling, but the LSB of the SFN field in the DCI format 1_0 (if included and applicable) is different from the corresponding LSB of the SFN of the UE sending PRACH (first RO1); (5) The UE receives the first downlink control information, and before that, it cannot correctly receive the transport block in the corresponding PDSCH; (6) The UE detects the first downlink control information scrambled based on the fifth RNTI or the format of the first downlink control information, and before that, it cannot correctly receive the transport block in the corresponding PDSCH; (7) The UE receives the first downlink control information, and prior to this, the higher layer has failed to identify the RAPID (RandomAccessPreambleIdentifier) ​​associated with the PRACH transmission from the UE's PRACH transmission. (8) The UE detects the first downlink control information or the format of the first downlink control information based on the fifth RNTI scrambling, and prior to this, the higher layer has failed to identify the RAPID associated with the PRACH transmission from the UE's PRACH transmission.

[0205] Specifically, if the above conditions are met, the UE can perform the following operations: (1) Detect the DCI format 1_0 corresponding to the random access response based on the first RA-RNTI; (2) After the first time interval, detect the DCI format 1_0 corresponding to the random access response based on the first RA-RNTI; (3) During the second time window or while running in the second time window, detect the DCI format 1_0 corresponding to the random access response based on the first RA-RNTI; (4) After the first time interval, within the second time window or during the operation of the second time window, detect the DCI format 1_0 corresponding to the random access response based on the first RA-RNTI; (5) After receiving the first downlink control information, or after detecting the first downlink control information scrambled based on the fifth RNTI or the first time interval of the format of the first downlink control information, within the second time window or during the operation of the second time window, detect the DCI format 1_0 corresponding to the random access response based on the first RA-RNTI; (6) Higher layers can instruct the physical layer to perform PRACH transmission; (7) Upon receiving the first downlink control information, or after detecting the first downlink control information scrambled based on the fifth RNTI or the first time interval of the format of the first downlink control information, the higher layer may instruct the physical layer to perform PRACH transmission; (8) Stop the second time window and start the third time window. Detect the DCI format 1_0 based on the first RA-RNTI scrambling within the third time window. The start time of the third time window is after the UE receives the first downlink control information, or after detecting the first downlink control information based on the fifth RNTI scrambling or the format of the first downlink control information, or after receiving the first downlink control information for a first time interval, or after detecting the first downlink control information based on the fifth RNTI scrambling or the format of the first downlink control information for a first time interval. (9) Higher layers may instruct the physical layer to perform PRACH transmission. If required by higher layers, the UE may transmit PRACH after receiving the first downlink control information, or after detecting the first downlink control information scrambled based on the fifth RNTI or the format of the first downlink control information, or after receiving the first downlink control information for a first time interval, or after detecting the first downlink control information scrambled based on the fifth RNTI or the format of the first downlink control information for a first time interval.

[0206] Optionally, the first time interval in at least one of the above embodiments may specifically refer to the following time interval after the UE receives the first downlink control information, or after detecting the first downlink control information scrambled based on the fifth RNTI or the last symbol of the format of the first downlink control information: (1) N T1 (Unit: milliseconds), where N T1 It is the time duration of the N1 symbol, corresponding to the PDSCH processing time of the PDCCH payload corresponding to the minimum SCS configuration of μ in the SCS configuration of DCI format 1_0, the corresponding PDSCH and the corresponding PRACH. (2) N T2 (Unit: milliseconds), where N T2 The duration of N2 symbols corresponding to the PDCCH processing time of UE processing capability 1; optionally, this duration is related to SCS; (3) N T3 (Unit: milliseconds), where N T3 It is the duration of N3 symbols, N T3 Subsequently, the activation-related information of the first RO in the first downlink control information takes effect; optionally, the duration is related to the SCS. (4) N T2 + N T3 (Unit: milliseconds); (5) N T2 +Δ Delay or N T3 +Δ Delay y or N T2 +N T3 +Δ Delay (Unit: milliseconds), where Δ Delay It is related to the frequency range; for example, for FR1, Δ Delay =0.5 milliseconds; FR2, Δ Delay =0.25 milliseconds.

[0207] In this embodiment of the present disclosure, within a first time interval when the UE receives the first downlink control information, or within a first time interval when the UE detects the first downlink control information scrambled based on the fifth RNTI or the format of the first downlink control information, the UE receives the random access response based on the second RA-RNTI. The advantage is that the UE can still receive the random access information based on the second RA-RNTI before the first downlink control information, avoiding the RA-RNTI conflict problem that occurs when using different RA-RNTIs determined based on the new indication RO during the effective time of the first downlink control information, thereby improving the performance of random access.

[0208] In this embodiment of the disclosure, the first RA-RNTI is determined based on at least one of the following: (1) The first uplink resource and the first downlink control information indicating the first random access resource; Optionally, it may specifically be an activated first random access resource determined based on a first uplink resource and a first downlink control information.

[0209] (2) First uplink resource and second uplink resource; The second uplink resource is determined based on the first downlink control information. Specifically, the second uplink resource is determined based on the indication information regarding the first random access resource in the first downlink control information.

[0210] (3) Based on the second RA-RNTI and the third RA-RNTI; The second RA-RNTI is determined based on the first uplink resource, and the third RA-RNTI is determined based on the second uplink resource.

[0211] Optionally, the first RA-RNTI is determined based on the absolute value of the difference between the second RA-RNTI and the third RA-RNTI; Optionally, the first RA-RNTI is determined based on the sum of the second RA-RNTI and the third RA-RNTI.

[0212] (4) The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information; Optionally, the first RA-RNTI is determined based on the frequency index of the first uplink resource and a third quantity, where the third quantity is the first random access resource indicated by the first downlink control information. Specifically, the first RA-RNTI is determined based on a first index, which is the sum of the frequency index of the first uplink resource and the third quantity. For example, if the frequency index of the first uplink resource is 3 and the third quantity is 4, then the first index is 3+4=7.

[0213] (5) The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; Optionally, the first RA-RNTI is determined based on the frequency index of the first uplink resource and the fourth quantity, where the fourth quantity is the number of frequency domain resources corresponding to the first random access resource indicated by the first information. The first RA-RNTI is determined based on the second index, which is the sum of the frequency index of the first uplink resource and the fourth quantity. For example, if the frequency index of the first uplink resource is 3 and the fourth quantity is 2, then the second index is 3+2=5.

[0214] (6) The frequency index of the first uplink resource, the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information, and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; Optionally, the first RA-RNTI can be calculated as follows: RA-RNTI=1+s_id+14×t_id+14×80×f_id+ 14×80×8×ul_carrier_id+14×80×k×2×diff Wherein, s_id represents the index of the first OFDM symbol of the first uplink resource (0≤s_id<14); t_id represents the index of the first slot of the first uplink resource in the system frame (0≤t_id<80); f_id represents the index of the first uplink resource in the frequency domain (0≤f_id<8); ul_carrier_id represents the index of the uplink carrier used for random access preamble transmission (0 represents NUL carrier, 1 represents SUL carrier); k represents the maximum value of f_id (e.g., the number of random access resources in the frequency domain, for example, k=8); and diff is the difference between the third and fourth quantities, or the absolute value of the difference between the third and fourth quantities.

[0215] Optionally, the first RA-RNTI is determined based on the difference between the third and fourth quantities, where the difference is the absolute value of the difference between the third and fourth quantities. As an example, if the third quantity is 4, the frequency index range of the first OR or the activated first RO is 0, 1, 2, 3. Based on the first downlink control information, it is determined that the first RO corresponding to frequency index 3 is deactivated, and the frequency domain quantity of the first RO becomes 3 (the fourth quantity), i.e., 0, 1, 2. Then the difference between the third and fourth quantities is 3-4=-1. If the UE selects frequency index 3 before receiving the first downlink control information, then according to the formula, adding the difference to the frequency index, the new frequency index can be determined as 3+(-1)=2. The UE will calculate the first RA-RNTI based on frequency index 2. As another example, if based on the first downlink control information, it is determined that the first RO with frequency index 4 is activated, and the fourth quantity is 5, then the difference between the third and fourth quantities is 5-4=1. If the frequency index corresponding to the first uplink resource is 3, then according to the formula, adding the difference to the frequency index, the new frequency index can be determined as 3+1=4. The UE will calculate the first RA-RNTI based on frequency index 4. Optionally, the first RA-RNTI can also be determined based on the modulo operation of the third and / or fourth quantities. As an example, if the number of frequency domain resources (the third quantity) of the first RO or the activated first RO is 4, and the corresponding frequency indices are 0, 1, 2, and 3, and based on the second downlink control information, it is determined that the first RO corresponding to frequency index 0 is deactivated, then the number of frequency domain resources of the activated first RO is 3. If the UE selects frequency index 3, then according to the formula 3mod3=0, the UE will calculate the first RA-RNTI based on frequency index 0. In another example, if based on the second downlink control information, it is determined that frequency index 1 is deactivated, then the maximum frequency index range becomes 3. If the UE selects frequency index 1, then according to the formula 1mod3=1, the UE will calculate the first RA-RNTI based on frequency index 1.

[0216] (7) The number of frequency domain resources corresponding to the configured second random access resource; Optionally, the third and fourth quantities mentioned above may also include the number of frequency domain resources corresponding to the second random access resource. For example, the third quantity is the sum of the number of frequency domain resources of the activated first random access resource determined based on the first downlink control information and the number of frequency domain resources corresponding to the second random access resource, and the fourth quantity is the sum of the number of frequency domain resources of the activated first random access resource determined based on the first information and the number of frequency domain resources corresponding to the second random access resource. Alternatively, the calculation methods of the third and fourth quantities mentioned above can be directly substituted to calculate the first RA-RNTI. Similar calculation processes will not be elaborated further.

[0217] Optionally, the first RA-RNTI, the second RA-RNTI, and / or the third RA-RNTI can be determined based on the random access resource information of the first uplink resource. This random access resource information is used to indicate whether the first uplink resource is related to the second feature. Optionally, the random access resource information can be represented by 1 bit. For example, 0 indicates that the first uplink resource is unrelated to the second feature, i.e., the type of the first uplink resource is the second random access resource; 1 indicates that the first uplink resource is related to the second feature, i.e., the type of the first uplink resource is the first random access resource. However, this is not limited to this.

[0218] Optionally, the first RA-RNTI, the second RA-RNTI, and / or the third RA-RNTI can be calculated based on the following formula: RA-RNTI=1+s_id+14×t_id+14×80×f_id+ 14×80×8×ul_carrier_id+14×80×k×2×RO_fdm_id Wherein, s_id represents the index of the first OFDM symbol of the first uplink resource (0≤s_id<14); t_id represents the index of the first time slot of the first uplink resource in the system frame (0≤t_id<80); f_id represents the index of the first uplink resource in the frequency domain (0≤f_id<8); ul_carrier_id represents the index of the uplink carrier used for random access preamble transmission (0 represents NUL carrier, 1 represents SUL carrier); k represents the maximum value of f_id (e.g., the number of random access resources in the frequency domain, for example, k=8); RO_fdm_id represents the random access resource type of the first uplink resource. Optionally, RO_fdm_id=0,1 (representing the first RO or the second RO), for example, 0 represents the first RO and 1 represents the second RO, or 0 represents the second RO and 1 represents the first RO.

[0219] In this embodiment of the disclosure, the advantage of the UE receiving the random access response based on the first RA-RNTI is that it solves the problem that the frequency index of the first RO changes due to the activation or deactivation of the first random access resource, resulting in inconsistent RA-RNTI calculation results associated with the same RO. This helps to improve the success rate of random access and reduce the latency of random access.

[0220] When the random access load of UEs in the network is low, the solution of this embodiment can avoid the base station still needing to frequently detect PRACH to monitor random access initiated by UEs, which would lead to a waste of network energy. It can adaptively adjust the random access resources configured in the network without affecting the random access performance of UEs, thereby achieving network energy saving.

[0221] In this embodiment of the disclosure, a method for determining the RA-RNTI associated with a first random access resource (e.g., a first RO) is provided. This method can be applied to a four-step random access scenario. Optionally, the RA-RNTI can be used to determine the first RA-RNTI in this embodiment of the disclosure.

[0222] In an alternative implementation, if an additional PRACH resource (e.g., a first random access resource, or a first RO) is configured, the RA-RNTI associated with an additional PRACH occasion (e.g., a first RO, or an additional RO) that transmits a random access preamble, or the RA-RNTI associated with the last valid additional PRACH occasion in the additional PRACH occasion set related to msg1 repetition, is calculated as follows: RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id Wherein, s_id represents the index of the first OFDM symbol of the additional PRACH timing (0≤s_id<14); t_id represents the index of the first slot of the additional PRACH timing in the system frame (0≤t_id<80); wherein, the subcarrier spacing for determining t_id is based on the value of μ={0,1,2,3}, and for μ={5,6}, t_id is the index of the 120kHz slot in the system frame containing the additional PRACH timing (0≤t_id<80); ul_carrier_id represents the UL carrier used for random access preamble transmission (0 represents NUL carrier, 1 represents SUL carrier); f_id represents the index of the additional PRACH timing in the frequency domain (M_RA≤f_id<8), wherein the value of M_RA is determined according to at least one of the following conditions: Optionally, if a time instance includes a PRACH timing that is frequency-division multiplexed (FDMed) with the additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), then M_RA is equal to the higher layer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0223] Optionally, if a time instance does not include a PRACH time that is frequency-division multiplexed with the additional PRACH time (e.g., a second RO, a non-additional RO, or a default RO), then M_RA is equal to zero; otherwise, M_RA is equal to the higher-level parameter msg1-FDM (if configured).

[0224] Optionally, if a time instance includes a PRACH timing frequency-division multiplexed with the additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), and the PRACH timing and the additional PRACH timing are on the same uplink (UL) carrier used for transmitting random access preambles (e.g., a normal uplink (NUL) carrier or a supplementary uplink (SUL) carrier), then M_RA is equal to the higherlayer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0225] Optionally, if a time instance does not include a PRACH timing (e.g., a second RO, a non-extra RO, or a default RO) that is frequency-division multiplexed on the same uplink carrier (e.g., a NUL carrier or a SUL carrier) as the additional PRACH timing, then M_RA is equal to zero; otherwise, M_RA is equal to the higher-layer parameter msg1-FDM (if configured).

[0226] Optionally, if a time instance includes both an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble, then M_RA is equal to the higher-layer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0227] Optionally, if a time instance does not simultaneously include an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble, then M_RA equals zero; otherwise, M_RA equals the higher-layer parameter msg1-FDM (if configured).

[0228] Optionally, if an uplink carrier in a time instance (e.g., a NUL carrier or a SUL carrier) simultaneously includes an additional PRACH timing (e.g., a first RO) and a PRACH timing (e.g., a second RO or a non-additional RO or a default RO) for transmitting a random access preamble, then M_RA is equal to the higher-layer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0229] Optionally, if an uplink carrier (e.g., a NUL carrier or a SUL carrier) in a time instance does not simultaneously include an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO or a non-additional RO or the default RO) for transmitting the random access preamble, then M_RA equals zero; otherwise, M_RA equals the higher-layer parameter msg1-FDM (if configured).

[0230] In another alternative implementation, the RA-RNTI associated with the PRACH timing of the Random Access Preamble, or the RA-RNTI associated with the last valid PRACH timing in the Msg1 repetition-related PRACH occasion set, is calculated as follows: RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id Wherein, s_id represents the index of the first OFDM symbol of the PRACH timing (0≤s_id<14), t_id represents the index of the first slot of the PRACH timing in the system frame (0≤t_id<80), wherein the subcarrier spacing for determining t_id is based on the μ value of μ={0,1,2,3}, and for μ={5,6}, t_id represents the index of the 120kHz slot in the system frame containing the PRACH timing (0≤t_id<80); ul_carrier_id is the UL carrier used for random access preamble transmission (0 represents NUL carrier, 1 represents SUL carrier); f_id represents the index of the PRACH timing in the frequency domain (M_RA≤f_id<8), wherein the value of M_RA is determined according to at least one of the following conditions: Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and a time instance includes a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) that is frequency-division multiplexed with the additional PRACH timing, then M_RA is equal to the higher layer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0231] Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and a time instance includes a PRACH timing that is frequency-division multiplexed with the additional PRACH timing (e.g., the second RO, a non-additional RO, or the default RO), and the PRACH timing and the additional PRACH timing are on the same UL carrier (e.g., an NUL carrier or a SUL carrier) used for transmitting the random access preamble, then M_RA is equal to the higher layer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0232] Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and a time instance includes both an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble, then M_RA is equal to the higher-layer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0233] Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and an uplink carrier (e.g., a NUL carrier or a SUL carrier) in a time instance simultaneously includes an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble, then M_RA is equal to the higher-layer parameter msg1-FDM (if configured); otherwise, M_RA is equal to zero.

[0234] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), or if the PRACH timing is an additional PRACH timing (if configured), and a time instance does not include a PRACH timing that is frequency-division multiplexed with the additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), then M_RA equals zero; otherwise, M_RA equals the higher-level parameter msg1-FDM (if configured).

[0235] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), or if the PRACH timing is an additional PRACH timing (if configured), and a time instance does not include a PRACH timing (e.g., a second RO, a non-additional RO, or a default RO) that is frequency-division multiplexed on the same uplink carrier (e.g., a NUL carrier or a SUL carrier) as the additional PRACH timing, then M_RA equals zero; otherwise, M_RA equals the higher-layer parameter msg1-FDM (if configured).

[0236] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., the second RO, a non-additional RO, or the default RO), or if the PRACH timing is an additional PRACH timing (if configured), and a time instance does not simultaneously include an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO), then M_RA equals zero; otherwise, M_RA equals the higher-layer parameter msg1-FDM (if configured).

[0237] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., second RO, non-additional RO, or default RO), or if the PRACH timing is an additional PRACH timing (e.g., first RO) (if configured) and an uplink carrier (e.g., NUL carrier or SUL carrier) in a time instance does not simultaneously include an additional PRACH timing (e.g., first RO) and a PRACH timing (e.g., second RO, non-additional RO, or default RO) for transmitting the random access preamble, then M_RA equals zero; otherwise, M_RA equals the higher-layer parameter msg1-FDM (if configured).

[0238] The method for determining the RA-RNTI associated with the first RO used for transmitting the random access preamble proposed in this disclosure can effectively avoid the RA-RNTI conflict caused by the first RO and the second RO having the same frequency (or frequency domain) index when the first RO and the second RO are in frequency division multiplexing, thereby reducing the probability of random access conflict and improving the performance of random access.

[0239] In this embodiment of the disclosure, a method for determining the MSGB-RNTI associated with a first random access resource (e.g., a first RO) is provided. This method can be applied to a two-step random access scenario. Optionally, the MSGB-RNTI can be used to determine the first RA-RNTI in this embodiment of the disclosure.

[0240] In an alternative implementation, if additional PRACH resources (e.g., a first random access resource, or a first RO) are configured, the MSGB-RNTI associated with an additional PRACH occasion (e.g., a first RO) that transmits a random access preamble, or the MSGB-RNTI associated with the last valid additional PRACH occasion in the additional PRACH occasion set related to Msg1 repetition, is calculated as follows: MSGB-RNTI=1+s_id+14×t_id+14×80×f_id +14×80×8×ul_carrier_id+14×80×8×2 Wherein, s_id represents the index of the first OFDM symbol of the additional PRACH timing (0≤s_id<14), t_id represents the index of the first slot of the additional PRACH timing in the system frame (0≤t_id<80), wherein the subcarrier spacing for determining t_id is based on the μ value of μ={0,1,2,3}, and for μ={5,6}, t_id represents the index of the 120kHz slot in the system frame containing the additional PRACH timing (0≤t_id<80); ul_carrier_id is the UL carrier used for random access preamble transmission (0 represents NUL carrier, 1 represents SUL carrier); f_id represents the index of the additional PRACH timing in the frequency domain (M_RA2≤f_id<8), wherein the value of M_RA2 is determined according to at least one of the following conditions: Optionally, if a time instance includes a PRACH time that is frequency-division multiplexed with the additional PRACH time (e.g., a second RO, a non-additional RO, or a default RO), then M_RA2 is equal to the higher layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0241] Optionally, if a time instance does not include a PRACH time that is frequency-division multiplexed with the additional PRACH time (e.g., a second RO, a non-additional RO, or a default RO), then M_RA2 is equal to zero; otherwise, M_RA2 is equal to the higher-level parameter msgA-RO-FDM (if configured).

[0242] Optionally, if a time instance includes a PRACH timing that is frequency-division multiplexed with the additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), and the PRACH timing and the additional PRACH timing are on the same UL carrier used for transmitting random access preambles (e.g., an NUL carrier or a SUL carrier), then M_RA2 is equal to the higher layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0243] Optionally, if a time instance does not include a PRACH timing (e.g., a second RO, a non-extra RO, or a default RO) that is frequency-division multiplexed on the same uplink carrier (e.g., a NUL carrier or a SUL carrier) as the additional PRACH timing, then M_RA2 is equal to zero; otherwise, M_RA2 is equal to the higher-layer parameter msgA-RO-FDM (if configured).

[0244] Optionally, if a time instance includes both an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble, then M_RA2 is equal to the higher-layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0245] Optionally, if a time instance does not simultaneously include an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO or a non-additional RO or the default RO) for transmitting the random access preamble, then M_RA2 is equal to zero; otherwise, M_RA2 is equal to the higher-layer parameter msgA-RO-FDM (if configured).

[0246] Optionally, if an uplink carrier (e.g., a NUL carrier or a SUL carrier) of a time instance includes both an additional PRACH timing (e.g., a first RO) and a PRACH timing (e.g., a second RO or a non-additional RO or a default RO) for transmitting a random access preamble, then M_RA2 is equal to the higher-layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0247] Optionally, if an uplink carrier (e.g., a NUL carrier or a SUL carrier) of a time instance does not simultaneously include an additional PRACH timing (e.g., a first RO) and a PRACH timing (e.g., a second RO or a non-additional RO or a default RO) for transmitting a random access preamble, then M_RA2 is equal to zero; otherwise, M_RA2 is equal to the higher-layer parameter msgA-RO-FDM (if configured).

[0248] In another alternative implementation, the MSGB-RNTI associated with the PRACH occasion of the Random Access Preamble, or the MSGB-RNTI associated with the last valid PRACH occasion in the Msg1 repetition-related PRACH occasion set, is calculated as follows: MSGB-RNTI=1+s_id+14×t_id+14×80×f_id +14×80×8×ul_carrier_id+14×80×8×2 Wherein, s_id represents the index of the first OFDM symbol of the PRACH timing (0≤s_id<14), t_id represents the index of the first slot of the PRACH timing in the system frame (0≤t_id<80), wherein the subcarrier spacing for determining t_id is based on the value of μ={0,1,2,3}, and for μ={5,6}, t_id represents the index of the 120kHz slot in the system frame containing the PRACH timing (0≤t_id<80); ul_carrier_id represents the UL carrier used for random access preamble transmission (0 represents NUL carrier, 1 represents SUL carrier); f_id is the index of the PRACH timing in the frequency domain (M_RA2≤f_id<8), wherein the value of M_RA2 is determined according to at least one of the following conditions: Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and a time instance includes a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) that is frequency-division multiplexed with the additional PRACH timing, then M_RA2 is equal to the higher layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0249] Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and a time instance includes a PRACH timing that is frequency-division multiplexed with the additional PRACH timing (e.g., the second RO, a non-additional RO, or the default RO), and the PRACH timing and the additional PRACH timing are on the same UL carrier (e.g., an NUL carrier or a SUL carrier) used for transmitting the random access preamble, then M_RA2 is equal to the higher layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0250] Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and a time instance includes both an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble, then M_RA2 is equal to the higher-layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0251] Optionally, if the PRACH timing is an additional PRACH timing (e.g., the first RO) (if configured) and an uplink carrier (e.g., a NUL carrier or a SUL carrier) in a time instance simultaneously includes an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble, then M_RA2 is equal to the higher-layer parameter msgA-RO-FDM (if configured); otherwise, M_RA2 is equal to zero.

[0252] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), or if the PRACH timing is an additional PRACH timing (if configured), and a time instance does not include a PRACH timing that is frequency-division multiplexed with the additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), then M_RA2 equals zero; otherwise, M_RA2 equals the higher-level parameter msgA-RO-FDM (if configured).

[0253] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., a second RO, a non-additional RO, or a default RO), or if the PRACH timing is an additional PRACH timing (if configured), and a time instance does not include a PRACH timing (e.g., a second RO, a non-additional RO, or a default RO) that is frequency-division multiplexed on the same uplink carrier (e.g., a NUL carrier or a SUL carrier) as the additional PRACH timing, then M_RA2 equals zero; otherwise, M_RA2 equals the higher-layer parameter msgA-RO-FDM (if configured).

[0254] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., second RO, non-additional RO, or default RO), or if the PRACH timing is an additional PRACH timing (if configured), and a time instance does not simultaneously include an additional PRACH timing (e.g., first RO) for transmitting the random access preamble and a PRACH timing (e.g., second RO, non-additional RO, or default RO), then M_RA2 equals zero; otherwise, M_RA2 equals the higher-layer parameter msgA-RO-FDM (if configured).

[0255] Optionally, if the PRACH timing is a non-additional PRACH timing (e.g., second RO, non-additional RO, or default RO), or if the PRACH timing is an additional PRACH timing (e.g., first RO) (if configured) and an uplink carrier (e.g., NUL carrier or SUL carrier) in a time instance does not simultaneously include an additional PRACH timing (e.g., first RO) and a PRACH timing (e.g., second RO, non-additional RO, or default RO) for transmitting the random access preamble, then M_RA2 equals zero; otherwise, M_RA2 equals the higher-layer parameter msgA-RO-FDM (if configured).

[0256] The method for determining the MSGB-RNTI associated with the first RO used for transmitting the random access preamble proposed in this disclosure can effectively avoid MSGB-RNTI conflicts caused by the first RO and the second RO having the same frequency (or frequency domain) index when the first RO and the second RO are in frequency division multiplexing, thereby reducing the probability of random access conflicts and improving the performance of random access.

[0257] In this embodiment of the disclosure, a method for determining the frequency domain index or frequency domain number associated with a first random access resource (e.g., a first RO) is also provided. This method can be applied to scenarios of four-step or two-step random access, wherein the determined frequency domain index or frequency domain number can be used to calculate the RA-RNTI associated with the first RO transmitting the random access preamble.

[0258] In one alternative implementation, the random access preamble can be transmitted in frequency resources specified by higher-layer parameters msg1-FrequencyStart or msg1-FrequencyStart2 or msgA-RO-FrequencyStart or msgA-RO-FrequencyStart2 (if configured), wherein msg1-FrequencyStart is the offset of the lowest PRACH transmission timing (e.g., the second RO) in the frequency domain relative to PRB 0, used to determine the frequency start (position) of the second RO; msg1-FrequencyStart2 is the offset of the lowest additional PRACH transmission timing (e.g., the first RO) in the frequency domain relative to PRB 0, used to determine the frequency start (position) of the first RO; msgA-RO-FrequencyStart is the offset of the lowest PRACH transmission timing (e.g., the second RO) in the frequency domain relative to PRB 0, used to determine the frequency start (position) of the second RO associated with the two-step random access; msgA-RO-FrequencyStart2 is the offset of the lowest PRACH transmission timing (e.g., the first RO) in the frequency domain relative to PRB 0. An offset of 0 is used to determine the frequency start (position) of the first RO associated with the two-step random access.

[0259] When the PRACH frequency resource is an additional PRACH frequency resource (e.g., the first random access resource, if configured), if a time instance includes additional PRACH timings (e.g., the first RO) and PRACH timings (e.g., the second RO or a non-additional RO or the default RO) for frequency division multiplexing (used to transmit the random access preamble); or, If a time instance includes additional PRACH timings (e.g., the first RO) and PRACH timings (e.g., the second RO, a non-additional RO, or the default RO) for frequency division multiplexing (used for transmitting the random access preamble), and the additional PRACH timings and the PRACH timings are on the same UL carrier (e.g., a NUL carrier or a SUL carrier) used for transmitting the random access preamble; or, If a time instance includes both an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting the random access preamble; or, If an uplink carrier in a time instance (e.g., a NUL carrier or a SUL carrier) simultaneously includes an additional PRACH timing (e.g., the first RO) and a PRACH timing (e.g., the second RO, a non-additional RO, or the default RO) for transmitting a random access preamble. Then, the PRACH frequency resources n_RA∈{msg1-FDM,msg1-FDM+1,...,M-1} (e.g., for a four-step random access scenario) are numbered incrementally starting from the lowest frequency in the initial uplink bandwidth part (initial UL BWP) during the initial access period. Otherwise, the numbering starts from the lowest frequency in the active uplink bandwidth part (active UL BWP), where the higher-layer parameter msg1-FDM is the number of frequency-division multiplexed PRACH transmission opportunities (e.g., the second RO) in a time instance, M is equal to the higher-layer parameter msg1-FDMTotal, which, if configured, is the total number of frequency-division multiplexed PRACH transmission opportunities in a time instance (e.g., including frequency-division multiplexed PRACH opportunities and additional PRACH opportunities); and / or, M can be the maximum number of frequency domain ROs (e.g., equal to the maximum number of second frequency domain ROs, e.g., 8); and / or, PRACH frequency resources n_RA∈{msgA-RO-FDM,msgA-RO-FDM+1,...,M-1} (e.g., for a two-step random access scenario), are numbered incrementally starting from the lowest frequency in the initial uplink bandwidth portion during initial access. Otherwise, they are numbered incrementally starting from the lowest frequency in the active uplink bandwidth portion, where the higher-layer parameter msgA-RO-FDM is the number of frequency-division multiplexed PRACH transmission opportunities (e.g., the second RO) for two-step random access in a time instance, M is equal to the higher-layer parameter msg1-FDMTotal, which, if configured, is the total number of frequency-division multiplexed PRACH transmission opportunities in a time instance (e.g., including frequency-division multiplexed PRACH opportunities and additional PRACH opportunities); and / or, M can be the maximum number of frequency-domain ROs (e.g., equal to the maximum number of second frequency-domain ROs, e.g., 8); for example Figure 5b An example is given. In a given time instance, there are a total of 6 Random Access Resources (ROs), including 4 first ROs and 2 second ROs. The frequency domain index of the second ROs is numbered incrementally starting from 0, i.e., 0, 1. For the first ROs, the starting frequency position of the first random access resource is determined based on the lowest frequency of the initial uplink bandwidth portion or the active uplink bandwidth portion and the higher layer parameter msg1-FrequencyStart2. The frequency index of the first RO is numbered incrementally starting from 2, i.e., 2, 3, 4, 5. That is, the lowest frequency index of the first RO is 2 (2 is the number of frequency domains of the second ROs). Otherwise, the PRACH frequency resources n_RA∈{0,1,...,M-1} are numbered incrementally starting from the lowest frequency in the initial uplink bandwidth portion during initial access. Alternatively, they are numbered incrementally starting from the lowest frequency in the active uplink bandwidth portion, where M equals the higher-layer parameter msg1-FDM2 or msgA-RO-FDM2 (msg1-FDM2 is the number of additional PRACH transmission opportunities (e.g., the first RO) in a time instance using frequency division multiplexing, and msgA-RO-FDM2 is the number of additional PRACH transmission opportunities (e.g., the first RO) in a time instance using frequency division multiplexing for two-step random access); and / or, M can be determined based on the higher-layer parameter msg1-FDM or msgA-RO-FDM and the maximum value of the number of frequency domain ROs (this maximum value can be...). The value is determined by the maximum number of frequency domain ROs equal to the second RO number, for example, 8). Specifically, M can be equal to the difference between the maximum number of frequency domain ROs and msg1-FDM or msgA-RO-FDM (e.g., M = maximum number of frequency domain ROs - msg1-FDM or M = maximum number of frequency domain ROs - msgA-RO-FDM), where msg1-FDM is the number of frequency division multiplexed PRACH transmission opportunities (e.g., the second RO) in a time instance, and msgA-RO-FDM is the number of frequency division multiplexed PRACH transmission opportunities (e.g., the second RO) in a time instance for two-step random access.

[0260] When the PRACH frequency resource is a regular PRACH resource (i.e., not an additional PRACH frequency resource, for example, the PRACH frequency resource is a second random access resource, if configured), the PRACH frequency resource n_RA∈{0,1,...,M-1} is numbered incrementally starting from the lowest frequency in the initial uplink bandwidth portion during initial access; otherwise, it is numbered incrementally starting from the lowest frequency in the active uplink bandwidth portion, where M is equal to the higher-layer parameter msg1-FDM or msgA-RO-FDM, if configured).

[0261] The method for determining the frequency domain index or frequency domain number of the first RO used for transmitting the random access preamble proposed in the embodiments of this disclosure can effectively avoid the problem of RA-RNTI or MSGB-RNTI conflict caused by the first RO and the second RO having the same frequency (or frequency domain) index when the first RO and the second RO are in frequency division multiplexing, thereby reducing the probability of random access conflict and improving the performance of random access.

[0262] This disclosure provides another method executed by the UE in a communication system, such as... Figure 12As shown, the method includes steps S1210, S1220, S1230, etc. It should be noted that at least one of the above operations may be omitted, or additional operations may be included, such as one or more operations described in the methods according to the embodiments of this disclosure.

[0263] In step S1210, the UE receives first information, which is used to indicate the first random access resource; Optionally, the specific execution method of this step can be found in the description of step S410, which will not be repeated here.

[0264] In step S1220, the UE sends a preamble on the first uplink resource, which is determined based on the first random access resource indicated by the first information; Optionally, the specific execution method of this step can be found in the description of step S420, which will not be repeated here.

[0265] In step S1240, if the UE receives the first downlink control information in the second time window, it stops the second time window and sends a preamble on the second uplink resource. The second uplink resource is determined based on the first downlink control information, and the transmission power of the preamble is related to the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information.

[0266] Optionally, if the UE meets the above conditions (such as the first condition), the UE can perform PRACH transmission (retransmission) according to the instructions of a higher layer, wherein the power of the PRACH transmission (preamble sent) is determined based on the first downlink control information.

[0267] For example, if the first random access resource indicated by the first information and the first random access resource indicated by the first downlink control information are different, the UE may stop the second time window and send a preamble on the second uplink resource.

[0268] For example, if the second RA-RNTI and the third RA-RNTI are different, the UE stops the second time window and sends a preamble on the second uplink resource; wherein the second RA-RNTI is determined based on the first uplink resource and the third RA-RNTI is determined based on the second uplink resource.

[0269] For example, the UE may stop the second time window and send a preamble on the second uplink resource if at least one of the following conditions is met: the PDCCH is not detected; and / or the PDCCH is detected, but the least significant bit (LSB) of the system frame number (SFN) field of the detected PDCCH is different from the corresponding LSB of the SFN of the first uplink resource.

[0270] It can be understood that similar conditions in the above text (such as the first condition) can also be applied to the embodiments of the present disclosure. For details not elaborated, reference can be made to the introduction in the above text, and no further repetition will be made here.

[0271] In the embodiments of the present disclosure, the transmission time of the retransmitted preamble can be determined based on the time related to the reception of the first downlink control information and a fixed time interval preset by the protocol.

[0272] Optionally, the interval between the transmission time of the preamble sent on the second uplink resource and the end time of the second time window is greater than a second time interval, and the second time interval is preset and / or determined based on the capabilities of the UE.

[0273] In the embodiments of the present disclosure, in step S1240, the UE can send the preamble based on a first transmission power, and the first transmission power is determined based on a first power step, and the first power step is determined by the first downlink control information.

[0274] Specifically, if the UE determines that the first RO is activated or deactivated according to the first downlink control information, the UE can determine the step size of the power of the sent preamble according to the number of frequency domain resources and / or the number of time domain resources of the first RO after being activated or deactivated, and this power step size is the step size for increasing the power when the UE retransmits the preamble on the first RO.

[0275] Among them, this power step size can be associated with the number of frequency domain resources and / or the number of time domain resources of the activated first RO indicated by the first downlink control information, and the association relationship can be configured or preset.

[0276] Optionally, the transmission power of the preamble sent on the second uplink resource is determined based on the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information and at least one threshold.

[0277] As an example, if the number of activated first RO frequency domain and / or time domain resources determined according to the first downlink control information is N, and the threshold number related to the activated first RO is Nr, where Nr is configured by high-layer signaling or preset by the protocol, then: When N is less than or equal to Nr, the power step size is P1; otherwise, the power step size is P2, where P1 > P2; or, When N is less than Nr, the power step size is P1; otherwise, the power step size is P2, where P1 > P2; or, When N is greater than Nr, the power step size is P1; otherwise, the power step size is P2, where P1 < P2; or, When N is greater than or equal to Nr, the power step size is P1; otherwise, the power step size is P2, where P1 < P2; Among them, the units of P1 and P2 can be dB, and N and Nr are integers greater than 0.

[0278] Also for example, the way in which the number of activated first RO frequency-domain and / or time-domain resources is associated with the power step size can be: when the number of activated first RO frequency-domain and / or time-domain resources is less than N4, the power step size associated with it is P1; when the number of activated first RO frequency-domain and / or time-domain resources is greater than or equal to N4 and less than N5, the power step size associated with it is P2; and so on, when the number of activated first RO frequency-domain and / or time-domain resources is greater than or equal to N_L - 1 and less than N_L, the power step size associated with it is P_L, where L = 1, 2, 3,..., N4 < N5 <... < N_L - 1 < N_L; the relevant configuration can be notified by high-layer signaling or be preset. For example, when the number of activated first RO frequency-domain and / or time-domain resources is M2, and M2 < N4, the power step size is P1, when N4 ≤ M2 < N5, the power step size is P2, and when N_L - 1 ≤ M < N_L, the power step size is PL.

[0279] Based on at least one of the above embodiments, in the embodiments of the present disclosure, the UE can determine whether to retransmit the preamble based on the random access response (msg2). Specifically, the random access response includes response indication information, and this response indication information is used to indicate the index of the RO, and this RO is the response corresponding to the random access response; the advantage is that it can avoid the UE receiving an incorrect random access response due to the conflict of the RA-RNTI, improve the success rate of the UE's random access, reduce the latency of random access, and also, the existing RA-RNTI can be reused, reducing the complexity of calculating or managing a new RA-RNTI.

[0280] Among them, the response indication information can be a PRACH mask, and this mask indicates the activated or deactivated first ROs among the first ROs associated with one or more SSB indexes. For example, the PRACH mask can be used to indicate that all first ROs are available; or, the even-numbered first ROs are available; or, the odd-numbered first ROs are available; or, the first RO numbered x is available (the range of the number x is determined based on the frequency index range of the first RO. For example, it can be 0 to M1 - 1, where M1 is the number of first ROs for the first random access using frequency division multiplexing (FDM)).

[0281] Based on at least one of the embodiments described above, in this embodiment of the disclosure, if the number of times the UE repeatedly transmits the preamble on the first RO exceeds H, then the UE retransmits the preamble on the second RO. Here, H can be obtained by the preamble transmission number threshold in the random access related configuration information. The advantage is to avoid the problem of random access failure caused by the UE being unable to determine a suitable random access resource (e.g., the activated first RO) due to the inability to receive the first downlink control information, thereby reducing the high random access latency caused by the UE.

[0282] In this embodiment of the disclosure, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0283] For example, the minimum frequency index of the first random access resource is greater than the maximum frequency index of the second random access resource. The maximum frequency index of the second random access resource is determined based on the number of frequency domain resources of the second random access resource. Starting from the frequency starting position of the first random access resource, the frequency index of the first random access resource is ordered in ascending order from low to high frequency based on the number of frequency domain resources of the first random access resource.

[0284] For example, the frequency index of the first random access resource is determined based on the following formula:

[0285] in, This indicates the frequency domain location number of the first random access resource. This indicates the number of frequency domain resources in the first random access resource. Indicates the total number of frequency domain resources. This indicates the modulo operation.

[0286] Alternatively, the first information indicates that a first random access resource is activated and / or deactivated, and the frequency index of the activated first random access resource is determined based on at least one of the following methods: The frequency starting position of the activated first random access resource and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the number of frequency domain resources of the second random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0287] The specific method for determining the frequency index of the first random access resource is not detailed here; please refer to the above description for further details.

[0288] In this embodiment of the disclosure, the method for determining the first uplink resource may include: The first uplink resource is the first available first random access resource among the activated first random access resources; and / or, the first uplink resource is selected from the configured second random access resource and the activated first random access resource according to the first criterion; and / or, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource. The first criterion includes at least one of the following: If the second random access resource and the activated first random access resource are time-division multiplexed, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource; If the second random access resource and the activated first random access resource are frequency division multiplexing, the first uplink resource is the first available first random access resource among the activated first random access resources.

[0289] For details regarding the specific method for determining the first uplink resource, please refer to the above description, which will not be repeated here.

[0290] In this embodiment of the disclosure, the first information includes at least one of the following: mask information of the SSB and the first random access resource activation mapping; periodic index of the SSB and the first random access resource activation mapping; periodic index of the physical random access channel PRACH association mode; at least one fourth RA-RNTI; the number of referenced fourth RA-RNTIs and fourth RA-RNTIs; frequency unit index; and time unit index. Optionally, the first information includes random access related configuration information and / or downlink control information. For any omissions or deficiencies in the first information and / or the first downlink control information, please refer to the above description, which will not be repeated here.

[0291] This disclosure provides yet another method executed by a UE in a communication system, the method comprising: Receive first configuration information related to a first random access and second configuration information related to a second random access, wherein the first configuration information is related to a second feature; A preamble is sent on the first uplink resource, which is determined based on the first configuration information; The second RA-RNTI is used to listen to the PDCCH to receive random access responses. The second RA-RNTI is determined based on the first configuration information and the second configuration information, or based on the first configuration information.

[0292] The descriptions of the first configuration information, the second configuration information, the second feature, and the second RA-RNTI can be found above and will not be repeated here.

[0293] Optionally, the second RA-RNTI is determined based on the random access resource information of the first uplink resource, which is used to indicate whether the first uplink resource is related to the second feature.

[0294] Optionally, the method further includes: receiving second downlink control information, the second downlink control information being used to indicate a first random access resource, the first uplink resource being determined based on first configuration information and the second downlink control information.

[0295] Optionally, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0296] Optionally, the method further includes: upon receiving first downlink control information in a second time window, listening to the PDCCH based on the first RA-RNTI within the second time window to receive a random access response, wherein the first downlink control information is used to indicate a first random access resource, and the first RA-RNTI is determined based on the first uplink resource and the first downlink control information.

[0297] For any aspects of the embodiments disclosed herein that are not detailed, please refer to the above description, which will not be repeated here.

[0298] In this embodiment of the disclosure, by Figure 13 A schematic diagram of a four-step random access procedure is shown. For example, a contention-based random access procedure consists of four steps. In the first step, the UE randomly selects a preamble from the preamble resource pool and sends it to the base station. The base station performs correlation detection on the received signal to identify the preamble sent by the UE. In the second step, the base station sends a Random Access Response (RAR) to the UE. The RAR may contain a random access preamble identifier, a timing advance instruction determined based on the delay estimate between the UE and the base station, a Cell-Radio Network Temporary Identifier (C-RNTI), and / or time-frequency resources allocated for the UE's next uplink transmission (time-frequency resources can refer to time-domain resources and / or frequency-domain resources). The UE searches for a PDCCH carrying this feedback based on the RA-RNTI associated with the timing of sending the random access preamble PRACH. In the third step, the UE 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 RRC link request. This user terminal identifier is unique to the UE and is used to resolve conflicts. In the fourth step, the base station sends a conflict resolution identifier to the UE, which includes the identifier of the winning user terminal in the conflict resolution process. After detecting its own identifier, the UE upgrades its temporary C-RNTI to a formal C-RNTI and sends an ACK (ACKnowledge Character) signal to the base station, completing the random access procedure and awaiting scheduling from the base station. Otherwise, the UE will begin a new random access procedure after a delay.

[0299] For a contention-free random access procedure, since the base station knows the user identifier, it can allocate a preamble to the UE. Therefore, when sending the preamble, the UE does not need to randomly select a sequence but will use the allocated preamble. After detecting the allocated preamble, the base station sends a corresponding random access response, including timing advance and uplink resource allocation information. After receiving the random access response, the UE considers uplink synchronization complete and waits for further scheduling by the base station. Therefore, a contention-free random access procedure consists of only two steps: step one is sending the preamble; step two is sending the random access response.

[0300] The random access method of this disclosure can be used in the above-described four-step or two-step random access process. However, it is not limited to this and can be extended or replaced with random access configurations for other features.

[0301] Optionally, the random access procedure of this disclosure embodiment can be applied to the following scenarios: 1. Initial access under RRC_IDLE (idle state); 2. Re-establish the RRC connection; 3. Cell handover; 4. Downlink data arrives and requests random access in RRC connected state (when uplink is asynchronous); 5. Uplink data arrives and requests random access in RRC connected state (when the uplink is asynchronous or no resources are allocated to the scheduling request in the PUCCH resource); 6. Positioning.

[0302] This disclosure also provides a method executed by a base station in a communication system, the method comprising: Send a first message, which is used to indicate a first random access resource; The UE receives a preamble sent by the UE. The preamble is sent on the first uplink resource, which is determined by the UE based on the first random access resource indicated by the first information. Send first downlink control information, which is used to indicate the first random access resource; The PDCCH is sent based on the first RA-RNTI to send a random access response. The first RA-RNTI is determined based on the first uplink resource and the first downlink control information.

[0303] Optionally, the first RA-RNTI is determined based on at least one of the following: The first uplink resource and the first random access resource indicated by the first downlink control information; The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information; The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; The frequency index of the first uplink resource, the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information, and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; The number of frequency domain resources corresponding to the configured second random access resource.

[0304] Optionally, the first RA-RNTI is determined based on random access resource information related to the first uplink resource, which is used to indicate whether the first uplink resource is related to the second feature.

[0305] Optionally, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0306] Optionally, the minimum frequency index of the first random access resource is greater than the maximum frequency index of the second random access resource. The maximum frequency index of the second random access resource is determined based on the number of frequency domain resources of the second random access resource. Starting from the frequency starting position of the first random access resource, the frequency index of the first random access resource is ordered in ascending order from low to high frequency based on the number of frequency domain resources of the first random access resource.

[0307] Optionally, the frequency index of the first random access resource is determined based on the following formula:

[0308] in, This indicates the frequency domain location number of the first random access resource. This indicates the number of frequency domain resources in the first random access resource. Indicates the total number of frequency domain resources. This indicates the modulo operation.

[0309] Optionally, the first information indicates that the first random access resource is activated and / or deactivated, and the frequency index of the activated first random access resource is determined based on at least one of the following methods: The frequency starting position of the activated first random access resource and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the number of frequency domain resources of the second random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0310] Optionally, the first information indicates that the first random access resource is activated and / or deactivated. The first uplink resource is the first available first random access resource among the activated first random access resources; and / or, the first uplink resource is selected from the configured second random access resource and the activated first random access resource according to the first criterion; and / or, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource. The first criterion includes at least one of the following: If the second random access resource and the activated first random access resource are time-division multiplexed, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource; If the second random access resource and the activated first random access resource are frequency division multiplexing, the first uplink resource is the first available first random access resource among the activated first random access resources.

[0311] Optionally, the first information and / or the first downlink control information includes at least one of the following: Mask information for the mapping between the SSB and the first random access resource activation; Periodic index of the mapping between SSB and first random access resource activation; PRACH associated periodic index; PRACH Association Pattern Periodic Index; At least one fourth RA-RNTI; Refer to the number of fourth RA-RNTIs and fourth RA-RNTIs; Frequency unit index; Time unit index.

[0312] Optionally, the first information includes random access-related configuration information and / or downlink control information.

[0313] This disclosure also provides a method executed by a base station in a communication system, the method comprising: Send a first message, which is used to indicate a first random access resource; The UE receives a preamble sent by the UE. The preamble is sent on the first uplink resource, which is determined by the UE based on the first random access resource indicated by the first information. Send first downlink control information, which is used to indicate the first random access resource; The UE receives a preamble sent in the second uplink resource, which is determined based on the first downlink control information. The received power of the preamble is related to the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information.

[0314] Optionally, the interval between the transmission time of the preamble on the second uplink resource and the end time of the second time window is greater than the second time interval, which is preset and / or determined based on the UE's capabilities.

[0315] Optionally, the transmission power of the UE transmitting the preamble on the second uplink resource is determined based on the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information and at least one threshold.

[0316] Optionally, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0317] Optionally, the minimum frequency index of the first random access resource is greater than the maximum frequency index of the second random access resource. The maximum frequency index of the second random access resource is determined based on the number of frequency domain resources of the second random access resource. Starting from the frequency starting position of the first random access resource, the frequency index of the first random access resource is ordered in ascending order from low to high frequency based on the number of frequency domain resources of the first random access resource.

[0318] Optionally, the frequency index of the first random access resource is determined based on the following formula:

[0319] in, This indicates the frequency domain location number of the first random access resource. This indicates the number of frequency domain resources in the first random access resource. Indicates the total number of frequency domain resources. This indicates the modulo operation.

[0320] Optionally, the first information indicates that the first random access resource is activated and / or deactivated, and the frequency index of the activated first random access resource is determined based on at least one of the following methods: The frequency starting position of the activated first random access resource and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the activated first random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the number of frequency domain resources of the second random access resource are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the activated first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the activated first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0321] Optionally, the first information indicates that the first random access resource is activated and / or deactivated. The first uplink resource is the first available first random access resource among the activated first random access resources; and / or, the first uplink resource is selected from the configured second random access resource and the activated first random access resource according to the first criterion; and / or, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource. The first criterion includes at least one of the following: If the second random access resource and the activated first random access resource are time-division multiplexed, the first uplink resource is the first available random access resource among the second random access resource and the activated first random access resource; If the second random access resource and the activated first random access resource are frequency division multiplexing, the first uplink resource is the first available first random access resource among the activated first random access resources.

[0322] Optionally, the first information and / or the first downlink control information includes at least one of the following: Mask information for the mapping between the SSB and the first random access resource activation; Periodic index of the mapping between SSB and first random access resource activation; PRACH associated periodic index; PRACH Association Pattern Periodic Index; At least one fourth RA-RNTI; Refer to the number of fourth RA-RNTIs and fourth RA-RNTIs; Frequency unit index; Time unit index.

[0323] Optionally, the first information includes random access-related configuration information and / or downlink control information.

[0324] According to another aspect of the embodiments of this disclosure, a method performed by a base station in a communication system is also provided, the method comprising: Send first configuration information related to the first random access and second configuration information related to the second random access, wherein the first configuration information is related to the second feature; Listen for the preamble sent by the UE. The preamble is sent on the first uplink resource, which is determined based on the first configuration information. The PDCCH is sent based on the second RA-RNTI to send a random access response. The second RA-RNTI is determined based on the first configuration information and the second configuration information, or determined based on the first configuration information.

[0325] Optionally, the second RA-RNTI is determined based on the random access resource information of the first uplink resource, which is used to indicate whether the first uplink resource is related to the second feature.

[0326] Optionally, the method further includes: sending second downlink control information, the second downlink control information being used to indicate a first random access resource, the first uplink resource being determined based on first configuration information and the second downlink control information.

[0327] Optionally, the frequency index of the first random access resource is determined based on at least one of the following methods: The frequency starting position of the first random access resource and the number of frequency domain resources of the first random access resource are determined based on the frequency domain starting position of the first random access resource. The frequency starting position of the configured second random access resource, the number of frequency domain resources of the second random access resource, and the number of frequency domain resources of the first random access resource are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource are determined based on the frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the number of frequency domain resources of the second random access resource. The frequency starting position of the first random access resource, the number of frequency domain resources of the first random access resource, and the total number of frequency domain resources of the random access resources are determined. The frequency starting position of the first random access resource, the number of frequency domain resources of the second random access resource, and the total number of frequency domain resources of the random access resources are determined.

[0328] Optionally, the method further includes: sending first downlink control information, the first downlink control information being used to indicate a first random access resource; and sending a PDCCH based on a first RA-RNTI to send a random access response, the first RA-RNTI being determined based on a first uplink resource and the first downlink control information.

[0329] 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.

[0330] 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.

[0331] 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.

[0332] Figure 14 The diagram shows a structural schematic of an electronic device to which an embodiment of the present invention applies, such as... Figure 14 As shown, Figure 14 The 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.

[0333] 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.

[0334] 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 14 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.

[0335] 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.

[0336] The memory 4003 is used to store computer programs that execute embodiments of the present disclosure, and is controlled by the processor 4001 to execute them. 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.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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 performed by a user equipment (UE) in a communication system, the method comprising: Comprise: Receiving first information, the first information is used for indicating first random access resource; Sending preamble on first uplink resource, the first uplink resource is determined based on the first information indicated first random access resource; In the second time window, receiving first downlink control information, then in the second time window based on first random access radio network temporary identifier RA-RNTI listening physical downlink control channel PDCCH for receiving random access response, wherein, the first downlink control information is used for indicating first random access resource, the first RA-RNTI is determined based on the first uplink resource and the first downlink control information.

2. The method of claim 1, wherein, In the second time window based on first RA-RNTI listening PDCCH for receiving random access response, comprising: In the case where the first random access resource indicated by the first information and the first random access resource indicated by the first downlink control information are different, in the second time window based on the first RA-RNTI listening PDCCH for receiving random access response.

3. The method according to claim 1 or 2, characterized in that, In the second time window based on first RA-RNTI listening PDCCH for receiving random access response, comprising: In the case where at least one of the following conditions is met, in the second time window based on the first RA-RNTI listening PDCCH for receiving random access response: No PDCCH is listened to; The least significant bit LSB of the system frame number SFN field of the listened PDCCH is different from the corresponding LSB of the SFN of the first uplink resource.

4. The method according to any one of claims 1 to 3, characterized in that, In the second time window based on first RA-RNTI listening PDCCH for receiving random access response, comprising at least one of the following: After a first time interval of receiving the first downlink control information, in the second time window based on the first RA-RNTI listening PDCCH for receiving random access response; Within the first time interval of receiving the first downlink control information, based on the second RA-RNTI listening PDCCH for receiving random access response, the second RA-RNTI is determined based on the first uplink resource; Wherein, the first time interval is the validity time interval for the first downlink control information.

5. The method according to any one of claims 1 to 4, characterized in that, The first RA-RNTI is determined based on at least one of the following: The first uplink resource and the first random access resource indicated by the first downlink control information; The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information; The frequency index of the first uplink resource and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; The frequency index of the first uplink resource, the number of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information, and the number of frequency domain resources corresponding to the first random access resource indicated by the first information; The number of frequency domain resources corresponding to the configured second random access resource.

6. The method according to any one of claims 1 to 5, characterized in that, The first RA-RNTI is determined based on random access resource related information of the first uplink resource, the random access resource related information being used to indicate whether the first uplink resource is related to a second feature.

7. The method according to any one of claims 1 to 6, characterized in that, The frequency index of the first random access resource is determined based on at least one of the following: based on a frequency start position of the first random access resource and a frequency domain resource quantity of the first random access resource; based on a frequency start position of a configured second random access resource, a frequency domain resource quantity of the second random access resource, and a frequency domain resource quantity of the first random access resource; based on a frequency start position of the first random access resource, a frequency domain resource quantity of the first random access resource, and a frequency domain resource quantity of the second random access resource; based on a frequency start position of the first random access resource, a frequency domain resource quantity of the first random access resource, and a total frequency domain resource quantity of random access resources; based on a frequency start position of the first random access resource, a frequency domain resource quantity of the second random access resource, and a total frequency domain resource quantity of random access resources.

8. The method of claim 7, wherein, The minimum frequency index of the first random access resource is greater than the maximum frequency index of the second random access resource, the maximum frequency index of the second random access resource being determined based on a frequency domain resource quantity of the second random access resource, and the frequency index of the first random access resource being in ascending order of frequency from low to high, based on a frequency domain resource quantity of the first random access resource, from a frequency start position of the first random access resource.

9. The method of claim 7, wherein, The frequency index of the first random access resource is determined based on the following formula: wherein, denotes a frequency domain location number of the first random access resource, denotes a frequency domain resource number of the first random access resource, denotes the total frequency domain resource number, denotes a modulo operation.

10. The method according to any one of claims 1 to 6, characterized in that, The first information indicates that the first random access resource is activated and / or deactivated, and the frequency index of the activated first random access resource is determined based on at least one of the following: based on a frequency start position of the activated first random access resource and a frequency domain resource quantity of the activated first random access resource; based on a frequency start position of a configured second random access resource, a frequency domain resource quantity of the second random access resource, and a frequency domain resource quantity of the activated first random access resource; based on a frequency start position of the activated first random access resource, a frequency domain resource quantity of the activated first random access resource, and a frequency domain resource quantity of the second random access resource; based on a frequency start position of the activated first random access resource, a frequency domain resource quantity of the activated first random access resource, and a total frequency domain resource quantity of random access resources; based on a frequency start position of the activated first random access resource, a frequency domain resource quantity of the second random access resource, and a total frequency domain resource quantity of random access resources. 11.A method performed by a user equipment (UE) in a communication system, the method comprising: comprising: receiving first information, the first information being used to indicate first random access resources; sending a preamble on a first uplink resource, the first uplink resource being determined based on the first random access resources indicated by the first information; In the second time window, if the first downlink control information is received, the second time window is stopped, and a preamble is sent on a second uplink resource, the second uplink resource being determined based on the first downlink control information, and a transmission power of the preamble being related to a quantity of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information.

12. A method performed by a base station in a communication system, the method comprising: Comprising: sending first information, the first information being used for indicating a first random access resource; listening to a preamble sent by a UE, the preamble being sent on a first uplink resource, the first uplink resource being determined by the UE based on the first information indicating the first random access resource; sending first downlink control information, the first downlink control information being used for indicating the first random access resource; sending a physical downlink control channel (PDCCH) based on a first random access-radio network temporary identifier (RA-RNTI) for sending a random access response, the first RA-RNTI being determined based on the first uplink resource and the first downlink control information.

13. A method performed by a base station in a communication system, the method comprising: Comprising: sending first information, the first information being used for indicating a first random access resource; listening to a preamble sent by a UE, the preamble being sent on a first uplink resource, the first uplink resource being determined by the UE based on the first information indicating the first random access resource; sending first downlink control information, the first downlink control information being used for indicating the first random access resource; listening to the preamble sent by the UE, the preamble being sent on a second uplink resource, the second uplink resource being determined based on the first downlink control information, and a reception power of the preamble being related to a quantity of frequency domain resources corresponding to the first random access resource indicated by the first downlink control information.

14. A user equipment, comprising: Comprising: a transceiver, and a processor coupled to the transceiver and configured to perform the method of any one of claims 1-11.

15. A base station, characterized by Comprising: a transceiver, and a processor coupled to the transceiver and configured to perform the method of claim 12 or 13.

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