Communication method and user equipment

Abstract

Provided in an embodiment of the present application are a communication method and user equipment, the method comprising: receiving system information, the system information comprising configuration information related to PRACH resources corresponding to at least two first UL carriers; determining one first UL carrier in the at least two first UL carriers based on at least one of the following parameters, and executing a random access process based on a PRACH resource corresponding to the determined first UL carrier: ID of the UE; a random number generated by the UE; a parameter value indicated by a high layer of the UE or determined by a media access control (MAC) layer, and an association between the parameter value and the first UL carrier; a UL carrier index number indicated by the base station; in the embodiment of the invention, the UE can access the network by using one of the at least two first UL carriers configured with the PRACH resources based on the above determination mode, so that the flexibility of the communication system is remarkably improved, and the congestion phenomenon when the UE accesses the network is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wireless communications, and in particular to a communication method and a user equipment (UE). Background Art

[0002] In order 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 quasi-5G communication systems. Therefore, 5G or quasi-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. In order to reduce the propagation loss of radio waves and increase the transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are discussed in 5G communication systems.

[0004] In addition, in the 5G communication system, development of system network improvements is underway based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc.

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

[0006] In an existing communication system, a cell includes a downlink (DL) carrier and at most two uplink (UL) carriers, wherein the two UL carriers are respectively referred to as a normal UL carrier (NUL) and a supplementary UL carrier (SUL). All UEs within the coverage of the cell access the network through these UL carriers, so the probability of congestion occurring during the random access process of the UE is relatively high. Summary of the invention

[0007] The purpose of the embodiments of the present application is to solve the problem of UE access network congestion.

[0008] According to one aspect of an embodiment of the present application, a method performed by a UE in a communication system is provided, the method including:

[0009] receiving system information, where the system information includes configuration information related to PRACH resources corresponding to at least two first UL carriers;

[0010] Determine a first UL carrier from at least two first UL carriers based on at least one of the following parameters, and perform a random access procedure based on a PRACH resource corresponding to the determined first UL carrier:

[0011] UE ID;

[0012] A random number generated by the UE;

[0013] a parameter value indicated by a higher layer of the UE or determined by a MAC layer, and an association between the parameter value and the first UL carrier;

[0014] UL carrier index number indicated by the base station;

[0015] The downlink DL carrier where the monitored paging message is located, and the association between the DL carrier and the first UL carrier.

[0016] In an optional implementation manner, determining a first UL carrier from at least two first UL carriers further includes:

[0017] A first UL carrier is determined from at least two first UL carriers based on the measured reference signal received power RSRP value and a preset RSRP threshold value.

[0018] In an optional implementation, the RSRP threshold value includes at least two, each first UL carrier corresponds to an RSRP interval determined based on the at least two preset RSRP threshold values, and based on the measured RSRP value and the at least two preset RSRP threshold values, determining a first UL carrier from the at least two first UL carriers includes:

[0019] An RSRP interval is determined based on the RSRP value, and a first UL carrier corresponding to the RSRP interval is used as the determined first UL carrier.

[0020] In an optional implementation manner, determining a first UL carrier from at least two first UL carriers based on the ID of the UE includes at least one of the following methods:

[0021] Performing a first modulo operation on the ID of the UE and the number of first UL carriers, and determining a first UL carrier from at least two first UL carriers based on a result of the first modulo operation;

[0022] A second modulo operation is performed on the sum of the ID of the UE and the weights of the at least two first UL carriers, and one first UL carrier is determined from among the at least two first UL carriers based on the second modulo operation result.

[0023] In an optional implementation manner, based on the ID of the UE, determining a first UL carrier from at least two first UL carriers includes at least one of the following methods:

[0024] The formula n 1 =UE_ID mod Nc 1 Determined n 1 The first UL carrier corresponding to the value is used as the determined first UL carrier;

[0025] will satisfy the formula The minimum n 2 The first UL carrier corresponding to the value is used as the determined first UL carrier;

[0026] Among them, UE_ID represents the ID of UE, Nc 1 represents the number of the first UL carrier, mod represents the modulo operation, n 1 Indicates the nth of at least two first UL carriers 1 +1 carrier, n 2 Indicates the nth of at least two first UL carriers 2 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two first UL carriers, Indicates the first n of at least two first UL carriers 2 + the sum of weights corresponding to 1 first UL carrier.

[0027] In an optional implementation manner, determining a first UL carrier from at least two first UL carriers based on a random number generated by the UE includes:

[0028] will satisfy the formula The minimum n 3 The first UL carrier corresponding to the value is used as the determined first UL carrier;

[0029] Among them, Nc 1 represents the number of the first UL carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of the weights of at least two first UL carriers, and randomValue represents the random value between 0 and 1 generated by the UE based on uniform distribution. A random number in the range, n 3 Indicates the nth of at least two first UL carriers 3 +1 carrier, Indicates the first n of at least two first UL carriers 3 + the sum of weights corresponding to 1 first UL carrier.

[0030] In an optional implementation manner, determining a first UL carrier from at least two first UL carriers based on the measured RSRP value, a preset RSRP threshold value, and at least one parameter includes at least one of the following:

[0031] The at least two first UL carriers include at least two normal uplink NUL carriers and one supplementary uplink SUL carrier, if the RSRP value is less than or equal to a preset first RSRP threshold value, the SUL carrier is used as the determined first UL carrier, and if the RSRP value is greater than the first RSRP threshold value, a first UL carrier is determined from the at least two NUL carriers based on at least one parameter;

[0032] The at least two first UL carriers include at least two NUL carriers and at least two SUL carriers, if the RSRP value is less than or equal to a preset first RSRP threshold value, based on at least one parameter, a first UL carrier is determined from the at least two SUL carriers, and if the RSRP value is greater than a second RSRP threshold value, based on at least one parameter, a first UL carrier is determined from the at least two NUL carriers;

[0033] The at least two first UL carriers include at least one NUL carrier and at least two SUL carriers. If the RSRP value is less than or equal to a preset first RSRP threshold value, a first UL carrier is determined from the at least two SUL carriers based on at least one parameter. If the RSRP value is greater than a third RSRP threshold value, the NUL carrier is used as the determined first UL carrier.

[0034] In an optional implementation manner, the UL carrier index number is indicated by the base station through at least one of the following:

[0035] The physical downlink shared channel PDSCH is used to schedule the transmission of paging messages and the downlink control information DCI carried by the physical downlink control channel PDCCH;

[0036] The control element MAC CE of the media access control layer carried by the PDSCH used to transmit the paging message;

[0037] Paging message.

[0038] In an optional implementation manner, the MAC CE indicates corresponding UL carrier index numbers for different UE groups respectively, and based on the UL carrier index number indicated by the base station and the ID of the UE, determines a first UL carrier from at least two first UL carriers, including:

[0039] Based on the ID of the UE, the UE group to which the UE belongs is determined, and the carrier with the UL carrier index number corresponding to the UE group to which the UE belongs is used as the determined first UL carrier.

[0040] In an optional implementation manner, when the UE fails to initiate a random access process on the determined first UL carrier, the method further includes:

[0041] Switch to at least one of the following target UL carriers and continue to initiate a random access procedure on the target UL carrier:

[0042] The UL carrier corresponding to the DL carrier on which the system message is transmitted;

[0043] The UL carrier with the smallest UL carrier index number;

[0044] A UL carrier indicated by the base station, wherein the UL carrier indicated by the base station is indicated by system information, or is indicated by a MAC subheader included in a random access response media access control layer protocol data unit RAR MAC PDU;

[0045] A UL carrier with a lower frequency than the first UL carrier frequency used for PRACH transmission;

[0046] SUL carrier.

[0047] In an optional implementation manner, the unsuccessful random access process includes that a predetermined number of consecutive random access processes are all unsuccessful.

[0048] In an optional implementation manner, if there are multiple UL carriers with a lower frequency than the first UL carrier frequency used for PRACH transmission, the method further includes:

[0049] Based on at least one of the following methods, selecting one of the multiple UL carriers with a lower frequency than the first UL carrier used for PRACH transmission as a target UL carrier:

[0050] Randomly select a UL carrier;

[0051] Selecting a UL carrier with the smallest UL carrier index number;

[0052] Select the UL carrier with the highest frequency;

[0053] Select the UL carrier with the lowest frequency.

[0054] In an optional implementation manner, switching to a target UL carrier and continuing to initiate a random access process on the target UL carrier includes at least one of the following situations:

[0055] If the random access process is still unsuccessful after the PRACH power climbs to the maximum transmit power, switch to the target UL carrier and continue to initiate the random access process on the target UL carrier with the maximum transmit power or the initial transmit power;

[0056] Switch to the target UL carrier. If the random access procedure is still unsuccessful after initiating the random access procedure on the target UL carrier, the random access procedure is initiated again after increasing the transmit power of the PRACH on the target UL carrier.

[0057] In an optional implementation, the system information further includes configuration information related to physical uplink control channel PUCCH resources corresponding to at least two second UL carriers, and the method further includes:

[0058] determining a second UL carrier among at least two second UL carriers;

[0059] The PUCCH is sent on the determined second UL carrier based on the determined PUCCH resource corresponding to the second UL carrier.

[0060] In an optional implementation, sending the PUCCH on the determined second UL carrier based on the determined PUCCH resource corresponding to the second UL carrier includes:

[0061] Based on the determined PUCCH resource corresponding to the second UL carrier, before receiving the UE-specific PUCCH configuration information, the PUCCH is sent on the determined second UL carrier.

[0062] In an optional implementation manner, determining a second UL carrier from at least two second UL carriers includes at least one of the following methods:

[0063] Using a first UL carrier used for PRACH transmission as the determined second UL carrier;

[0064] Determine a second UL carrier from among at least two second UL carriers based on the first UL carrier used for PRACH transmission and an association between the first UL carrier and the second UL carrier;

[0065] Determine a second UL carrier from at least two second UL carriers based on an association between the PRACH resources and the PUCCH resources;

[0066] Using a second UL carrier with the smallest UL carrier index as the determined second UL carrier;

[0067] Determine a second UL carrier from the at least two second UL carriers based on an indication of a random access response in a second step message of a four-step random access procedure, or based on an indication of scheduling downlink control information DCI in a fourth step message of a four-step random access procedure, or based on an indication of a successful random access response included in a second step message of a two-step random access procedure;

[0068] Based on the ID of the UE, one second UL carrier is determined from among the at least two second UL carriers.

[0069] In an optional implementation manner, determining a second UL carrier from at least two second UL carriers based on the ID of the UE includes at least one of the following methods:

[0070] performing a third modulo operation on the ID of the UE and the number of second UL carriers, and determining a second UL carrier from the at least two second UL carriers based on a result of the third modulo operation;

[0071] A fourth modulo operation is performed on the sum of the ID of the UE and the weights of the at least two second UL carriers, and based on the fourth modulo operation result, one second UL carrier is determined from among the at least two second UL carriers.

[0072] In an optional implementation manner, determining a second UL carrier from at least two second UL carriers based on the ID of the UE includes at least one of the following methods:

[0073] The formula n 4 =UE_ID mod Nc 2 Determined n 4 the second UL carrier corresponding to the value as the determined second UL carrier;

[0074] will satisfy the formula The minimum n 5 the second UL carrier corresponding to the value as the determined second UL carrier;

[0075] Among them, UE_ID represents the ID of UE, Nc 2 represents the number of the second UL carrier, mod represents the modulo operation, n 4 represents the nth of the at least two second UL carriers 4 +1 carrier, n 5 represents the nth of the at least two second UL carriers 5 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two second UL carriers, Indicates the first n of at least two second UL carriers 5 + the sum of weights corresponding to 1 second UL carrier.

[0076] In an optional implementation, the system information further includes configuration information related to an initial uplink bandwidth part BWP corresponding to at least two third UL carriers, and the method further includes:

[0077] determining a third UL carrier among at least two third UL carriers;

[0078] Based on the determined initial uplink BWP corresponding to the third UL carrier, a PUSCH is sent on the determined third UL carrier.

[0079] In an optional implementation, sending a PUSCH on the determined third UL carrier based on the determined initial uplink BWP corresponding to the third UL carrier includes:

[0080] Based on the determined initial uplink BWP corresponding to the third UL carrier, before establishing the radio resource control RRC connected state, a PUSCH is sent on the determined third UL carrier.

[0081] In an optional implementation manner, determining a third UL carrier from at least two third UL carriers includes at least one of the following methods:

[0082] If the configuration information related to the initial uplink BWP related to the determined first UL carrier is received, the determined first UL carrier is used as the determined third UL carrier;

[0083] If the configuration information related to the initial uplink BWP related to the determined first UL carrier is not received, using the UL carrier corresponding to the DL carrier for transmitting the system message as the determined third UL carrier, or determining a third UL carrier from at least two third UL carriers;

[0084] Determine a third UL carrier from at least two third UL carriers based on the UL carrier index number indicated in the random access response RAR;

[0085] Based on the ID of the UE, one third UL carrier is determined from among the at least two third UL carriers.

[0086] In an optional implementation manner, based on the ID of the UE, determining a third UL carrier from at least two third UL carriers includes at least one of the following methods:

[0087] performing a fifth modulo operation on the ID of the UE and the number of third UL carriers, and determining a third UL carrier from at least two third UL carriers based on a result of the fifth modulo operation;

[0088] A sixth modulo operation is performed on the sum of the ID of the UE and the weights of the at least two third UL carriers, and based on the sixth modulo operation result, one third UL carrier is determined from the at least two third UL carriers.

[0089] In an optional implementation manner, based on the ID of the UE, determining a third UL carrier from at least two third UL carriers includes at least one of the following methods:

[0090] The formula n 6 =UE_ID mod Nc 3 Determined n 6The third UL carrier corresponding to the value is used as the determined third UL carrier;

[0091] will satisfy the formula The minimum n 7 The third UL carrier corresponding to the value is used as the determined third UL carrier;

[0092] Among them, UE_ID represents the ID of UE, Nc 3 represents the number of the third UL carrier, mod represents the modulo operation, n 6 Indicates the nth of at least two third UL carriers 6 +1 carrier, n 7 Indicates the nth of at least two third UL carriers 7 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two third UL carriers, Indicates the first n of at least two third UL carriers 7 + the sum of weights corresponding to 1 third UL carrier.

[0093] In an optional implementation, the system information further includes configuration information related to the initial downlink BWP corresponding to at least two first DL carriers, and the method further includes:

[0094] determining a first DL carrier among at least two first DL carriers;

[0095] Based on the determined initial downlink BWP corresponding to the first DL carrier, the PDCCH and the PDSCH are received on the determined first DL carrier.

[0096] In an optional implementation, receiving a PDCCH and a PDSCH on the determined first DL carrier based on the determined initial downlink BWP corresponding to the first DL carrier includes:

[0097] Based on the determined initial downlink BWP corresponding to the first DL carrier, before establishing the RRC connected state, the PDCCH and the PDSCH are received on the determined first DL carrier.

[0098] In an optional implementation manner, determining a first DL carrier from at least two first DL carriers includes at least one of the following methods:

[0099] Determine a first DL carrier among at least two first DL carriers based on the determined first UL carrier and an association between the first UL carrier and the first DL carrier;

[0100] Based on the ID of the UE, a first DL carrier is determined from among the at least two first DL carriers.

[0101] In an optional implementation manner, determining a first DL carrier from at least two first DL carriers based on the ID of the UE includes at least one of the following methods:

[0102] performing a seventh modulo operation on the ID of the UE and the number of first DL carriers, and determining a first DL carrier from at least two first DL carriers based on a result of the seventh modulo operation;

[0103] An eighth modulo operation is performed on the sum of the ID of the UE and the weights of the at least two first DL carriers, and based on the eighth modulo operation result, one first DL carrier is determined from among the at least two first DL carriers.

[0104] In an optional implementation manner, determining a first DL carrier from at least two first DL carriers based on the ID of the UE includes at least one of the following methods:

[0105] The formula n 8 =UE_ID mod Nc 4 Determined n 8 The first DL carrier corresponding to the value is used as the determined first DL carrier;

[0106] will satisfy the formula The minimum n 9 The first DL carrier corresponding to the value is used as the determined first DL carrier;

[0107] Among them, UE_ID represents the ID of UE, Nc 4 represents the number of the first DL carrier, mod represents the modulo operation, n 8 represents the nth of at least two first DL carriers 8 +1 carrier, n 9 represents the nth of at least two first DL carriers 9 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two first DL carriers, Indicates the first n of at least two first DL carriers 9 + the sum of weights corresponding to 1 first DL carrier.

[0108] In an optional implementation, the system information further includes configuration information related to a paging PDCCH search space for monitoring paging messages corresponding to at least two second DL carriers, and the method further includes:

[0109] Determining, based on the ID of the UE, a second DL carrier from at least two second DL carriers;

[0110] Based on the determined paging PDCCH search space corresponding to the second DL carrier, a scheduling PDCCH of a paging message is monitored on the determined second DL carrier.

[0111] In an optional implementation manner, determining a second DL carrier from at least two second DL carriers based on the ID of the UE includes:

[0112] Determine a paging opportunity index number based on the ID of the UE, perform a ninth modulo operation on the paging opportunity index number and the number of second DL carriers, and determine a second DL carrier from at least two second DL carriers based on a result of the ninth modulo operation;

[0113] Based on the ID of the UE, a paging opportunity index is determined, a modulo 10 operation is performed on the sum of the paging opportunity index and the weights of at least two second DL carriers, and a second DL carrier is determined from the at least two second DL carriers based on the modulo 10 operation result.

[0114] In an optional implementation manner, determining a second DL carrier from at least two second DL carriers based on the ID of the UE includes:

[0115] The formula n 10 =floor(UE_ID / (N*Ns))mod Nc 5 Determined n 10 The second DL carrier corresponding to the value is used as the determined second DL carrier;

[0116] will satisfy the formula The minimum n 11 The second DL carrier corresponding to the value is used as the determined second DL carrier;

[0117] Wherein, UE_ID represents the ID of the UE, N and Ns are parameters used to determine the paging opportunity index number, floor represents the rounding operation, floor(UE_ID / (N*Ns)) represents the determined paging opportunity index number, Nc 5 Indicates the number of second DL carriers, mod indicates modulo operation, n 10 represents the nth of at least two second DL carriers 10 +1 carrier, n 11 represents the nth of at least two second DL carriers 11 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two second DL carriers, Indicates the first n of at least two second DL carriers 11 + the sum of weights corresponding to 1 second DL carrier.

[0118] According to another aspect of an embodiment of the present application, a user equipment is provided, the user equipment comprising:

[0119] a transceiver configured to transmit and receive signals; and

[0120] The processor is coupled to the transceiver and is configured to execute the method performed by the UE provided in the embodiment of the present application.

[0121] According to another aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method performed by the UE provided in the embodiment of the present application is implemented.

[0122] According to another aspect of an embodiment of the present application, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the method performed by the UE provided in the embodiment of the present application is implemented.

[0123] The communication method and user equipment provided in the embodiments of the present application receive system information, where the system information includes configuration information related to PRACH resources corresponding to at least two first UL carriers; determine a first UL carrier among the at least two first UL carriers based on at least one of the following parameters, and perform a random access process based on the PRACH resources corresponding to the determined first UL carrier: UE ID; a random number generated by the UE; a parameter value indicated by the high layer of the UE or determined by the media access control MAC layer, and the association between the parameter value and the first UL carrier; the UL carrier index number indicated by the base station; the downlink DL carrier where the monitored paging message is located, and the association between the DL carrier and the first UL carrier, that is, the UE can use one of the at least two first UL carriers configured with PRACH resources to access the network based on the above determination method, which significantly improves the flexibility of the communication system and reduces congestion when the UE accesses the network. BRIEF DESCRIPTION OF THE DRAWINGS

[0124] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in describing the embodiments of the present application are briefly introduced below.

[0125] Figure 1 A schematic diagram of the overall structure of a wireless network provided in an embodiment of the present application;

[0126] Figure 2a A schematic diagram of a transmission path provided in an embodiment of the present application;

[0127] Figure 2b A schematic diagram of a receiving path provided in an embodiment of the present application;

[0128] Figure 3a A schematic diagram of the structure of a UE provided in an embodiment of the present application;

[0129] Figure 3b A schematic diagram of the structure of a base station provided in an embodiment of the present application;

[0130] Figure 4 A flowchart of a method performed by a UE according to an embodiment of the present application is provided;

[0131] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0132] The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. This description includes various specific details to facilitate understanding but should be considered as exemplary only. Therefore, one of ordinary skill 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 the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0133] The terms and expressions used in the following specification and claims are not limited to their dictionary meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined in the appended claims and their equivalents.

[0134] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0135] The term "include" or "may include" refers to the presence of the corresponding disclosed functions, operations or components that can be used in various embodiments of the present disclosure, rather than limiting the presence of one or more additional functions, operations or features. In addition, the term "include" or "have" may be interpreted as indicating certain characteristics, numbers, steps, operations, constituent elements, components or combinations thereof, but should not be interpreted as excluding the possibility of the presence of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0136] The term "or" used in various embodiments of the present 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.

[0137] Unless defined differently, all terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as understood by those skilled in the art of the present disclosure. Common terms as defined in dictionaries are interpreted as having meanings consistent with the context in the relevant technical field, and should not be interpreted ideally or overly formally unless explicitly defined in the present disclosure.

[0138] Figure 1 An example wireless network 100 is shown in accordance with various embodiments of the present disclosure. Figure 1 The embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.

[0139] 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 private IP network, or other data network.

[0140] Depending on the network type, other well-known terms such as "base station" 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 to remote terminals. Also, depending on the network type, other well-known terms such as "mobile station", "subscriber 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 a remote wireless device that wirelessly accesses a gNB, whether the UE is a mobile device (such as a mobile phone or smartphone) or a commonly thought of fixed device (such as a desktop computer or vending machine).

[0141] The gNB 102 provides wireless broadband access to a network 130 for a plurality of first user equipments (UEs) within a coverage area 120 of the gNB 102. The plurality of UEs include: a UE 111, which may be located in a small business (SB); a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); and a UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. The gNB 103 provides wireless broadband access to the network 130 for a plurality of base stations within a coverage area 125 of the gNB 103. The plurality of base stations include a UE 115 and a UE 116. In some embodiments, one or more of the gNBs 101-103 may be capable of communicating with each other and with the UEs 111-116 using 5G, long term evolution (LTE), LTE-A, WiMAX, or other advanced wireless communication technologies.

[0142] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with gNBs, 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.

[0143] 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 the present disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook design and structure for a system with a 2D antenna array.

[0144] although Figure 1 One example of a wireless network 100 is shown, but Figure 1 Various changes may be made. For example, wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement. Also, 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 an external telephone network or other type of data network.

[0145] Figure 2a and Figure 2bExample wireless transmit and receive paths according to the present disclosure are shown. In the following description, transmit path 200 can be described as being implemented in a gNB (such as gNB 102) and 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 with a 2D antenna array as described in embodiments of the present disclosure.

[0146] 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, an add cyclic prefix block 225, and an upconverter (UC) 230. The receive path 250 includes a downconverter (DC) 255, a remove cyclic prefix 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.

[0147] In the transmit path 200, the 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 modulation symbols. The serial-to-parallel (S-to-P) block 210 converts (such as demultiplexes) the serial modulation symbols into parallel data to generate N parallel symbol streams, where N is the number of IFFT / FFT points used in the gNB 102 and the UE 116. The N-point IFFT block 215 performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial block 220 converts (such as multiplexes) the parallel time-domain output symbols from the N-point IFFT block 215 to generate a serial time-domain signal. The add cyclic prefix block 225 inserts a cyclic prefix into the time-domain signal. The up-converter 230 modulates (such as up-converts) the output of the add cyclic prefix block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at baseband before conversion to RF frequency.

[0148] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through a wireless channel, and an operation opposite to that at gNB 102 is performed at UE 116. Downconverter 255 downconverts the received signal to a baseband frequency, and remove cyclic prefix 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.

[0149] Each of gNBs 101-103 may implement a transmit path 200 similar to that for transmitting in the downlink to UEs 111-116 and may implement a receive path 250 similar to that for receiving in the uplink from UEs 111-116. Similarly, each of UEs 111-116 may implement a transmit path 200 for transmitting in the uplink to gNBs 101-103 and may implement a receive path 250 for receiving in the downlink from gNBs 101-103.

[0150] Figure 2a and Figure 2b Each of the components in can be implemented using hardware only, or a combination of hardware and software / firmware. As a specific example, Figure 2a and Figure 2b At least some of the components in can be implemented with software, while other components can be implemented by configurable hardware or a mixture of software and configurable hardware. For example, FFT block 270 and IFFT block 215 can be implemented as a configurable software algorithm, in which the value of the number of points N can be modified according to the implementation.

[0151] In addition, although described as using FFT and IFFT, this is illustrative only and should not be construed as limiting the scope of the present disclosure. Other types of transforms can be used, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions. 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 as a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0152] although Figure 2a and Figure 2b An example of a wireless transmit and receive path is shown, but the Figure 2a and Figure 2b Make various changes. For example, Figure 2a and Figure 2b The various components in can be combined, further subdivided or omitted, and additional components can be added according to specific needs. Figure 2a and Figure 2b It is intended to illustrate examples of the types of transmit and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communications in a wireless network.

[0153] Figure 3a An example UE 116 according to the present disclosure is shown. Figure 3a The embodiment of UE 116 shown in FIG. 1 is for illustration only, and Figure 1 UEs 111-115 can have the same or similar configurations. However, UEs have a variety of configurations, and Figure 3a The scope of the present disclosure is not limited to any particular implementation of the UE.

[0154] UE 116 includes antenna 305, radio frequency (RF) transceiver 310, transmit (TX) processing circuit 315, microphone 320, and receive (RX) processing circuit 325. UE 116 also includes speaker 330, processor / controller 340, input / output (I / O) interface (IF) 345, input device(s) 350, display 355, and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0155] The RF transceiver 310 receives incoming RF signals from the antenna 305 transmitted by the gNB of the wireless network 100. The RF transceiver 310 downconverts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 325 sends the processed baseband signal to the speaker 330 (such as for voice data) or to the processor / controller 340 (such as for web browsing data) for further processing.

[0156] The TX processing circuit 315 receives analog or digital voice data from the microphone 320, or receives other outgoing baseband data (such as network data, email, or interactive video game data) from the processor / controller 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 305.

[0157] The processor / controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor / controller 340 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor / controller 340 includes at least one microprocessor or microcontroller.

[0158] The processor / controller 340 is also capable of executing other processes and programs resident in the memory 360, such as operations for channel quality measurement and reporting for a system with a 2D antenna array as described in the embodiments of the present disclosure. The processor / controller 340 is capable of moving data into or out of the memory 360 as needed for the executed process. In some embodiments, the processor / controller 340 is configured to execute applications 362 based on the OS 361 or in response to signals received from the gNB or operator. The processor / controller 340 is also coupled to the I / O interface 345, where the I / O interface 345 provides the UE 116 with the ability to connect to other devices such as laptops and handheld computers. The I / O interface 345 is the communication path between these accessories and the processor / controller 340.

[0159] Processor / controller 340 is also coupled to input device(s) 350 and display 355. An operator of UE 116 can input data into UE 116 using input device(s) 350. Display 355 can be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). Memory 360 is coupled to processor / controller 340. A portion of memory 360 can include random access memory (RAM), while another portion of memory 360 can include flash memory or other read-only memory (ROM).

[0160] 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 in can be combined, further subdivided, or omitted, and additional components can be added according to specific needs. As a specific example, processor / controller 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Moreover, although Figure 3a The UE 116 is shown configured as a mobile phone or smart phone, but the UE can be configured to operate as other types of mobile or stationary devices.

[0161] Figure 3bAn example gNB 102 according to the present disclosure is shown. Figure 3b The embodiment of the gNB 102 shown in FIG. is for illustration only, and Figure 1 Other gNBs can have the same or similar configurations. However, gNBs have a variety of configurations, and Figure 3b The scope of the present 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 structure as gNB 102.

[0162] like Figure 3b As shown in FIG. 1 , 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.

[0163] The RF transceivers 372a-372n receive incoming RF signals from the antennas 370a-370n, such as signals transmitted by a UE or other gNB. The RF transceivers 372a-372n downconvert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to the RX processing circuitry 376, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. The RX processing circuitry 376 sends the processed baseband signals to the controller / processor 378 for further processing.

[0164] 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. The RF transceivers 372a-372n receive the outgoing processed baseband or IF signals from the TX processing circuit 374 and up-convert the baseband or IF signals to RF signals that are transmitted via the antennas 370a-370n.

[0165] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceivers 372a-372n, the RX processing circuitry 376, and the TX processing circuitry 374 in accordance with well-known principles. The controller / processor 378 can also support additional functionality, such as more advanced wireless communication functionality. For example, the controller / processor 378 can perform a Blind Interference Sensing (BIS) process, such as performed through a Blind Interference Sensing (BIS) algorithm, and decode a received signal with an interference signal subtracted. The controller / processor 378 can support any of a variety of other functions in the gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0166] The controller / processor 378 can also execute programs and other processes resident in the memory 380, such as a basic OS. The controller / processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, the controller / processor 378 supports communications between entities such as web RTC. The controller / processor 378 can move data into or out of the memory 380 as needed by the executing process.

[0167] 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 via a network. The backhaul or network interface 382 can support communication via any suitable (multiple) wired or wireless connections. 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 technology or NR, LTE or LTE-A), the backhaul or network interface 382 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow 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 structure that supports communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0168] The memory 380 is coupled to the controller / processor 378. A portion of the memory 380 can include RAM, while another portion of the memory 380 can include flash memory or other ROM. In some embodiments, a plurality of instructions such as a BIS algorithm are stored in the memory. The plurality of instructions are configured to cause the 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.

[0169] As described in more detail below, the transmit and receive paths of the gNB 102 (implemented using the RF transceivers 372a-372n, the TX processing circuitry 374, and / or the RX processing circuitry 376) support aggregated communications with FDD cells and TDD cells.

[0170] although Figure 3b An example of a gNB 102 is shown, but the Figure 3b For example, gNB 102 can include any number of Figure 3a . As a specific example, an access point can include a number of 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, while shown as including a single instance of TX processing circuitry 374 and a single instance of RX processing circuitry 376, the gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0171] In the existing communication system, a cell is configured with a maximum of two uplink carriers, namely NUL and SUL. The SUL carrier is usually located in a lower frequency band to enhance the coverage of the uplink. If the operator has more spectrum resources, multiple carriers can also be deployed to increase the terminal rate. For example, multiple carriers can be aggregated through carrier aggregation (CA), and the resources on multiple carriers can be allocated to UE for use to increase the data rate of the UE. Although CA can aggregate many carriers, these carriers all serve UEs through secondary cells. UEs cannot use carriers aggregated through CA before establishing an RRC (Radio Resource Control) connection with the network. All UEs can only access the network through the primary cell, that is, all UEs access the network through a maximum of two UL carriers, so the probability of congestion during the random access process of the UE is high. Therefore, the cell needs to configure more carriers to unload the UE, for example, more UL carriers and / or more DL carriers.

[0172] In the embodiments of the present application, based on the consideration that it is necessary to add multiple carriers in a cell, technical details are provided for a UE to determine a carrier among multiple carriers for a random access process.

[0173] An embodiment of the present application provides a method executed by a UE in a communication system, such as Figure 4 As shown, the method includes:

[0174] Step S101: receiving system information, where the system information includes configuration information related to PRACH (Physiacal Random Access Channel) resources on at least two first UL carriers;

[0175] Step S102: determining a first UL carrier from at least two first UL carriers based on at least one of the following parameters, and performing a random access procedure based on a PRACH resource corresponding to the determined first UL carrier;

[0176] For steps S101 and S102, the method for the UE to determine a first UL carrier among at least two first UL carriers described in the embodiment of the present application can be understood as a method for the UE to determine a PRACH configuration (resource pool) among at least two PRACH configurations (resource pools), that is, the UE determines a PRACH configuration (resource pool) among at least two PRACH configurations (resource pools), and sends PRACH based on the determined PRACH configuration (resource pool), wherein different PRACH configurations (resource pools) correspond to different UL carriers.

[0177] (1) Information identifying the UE;

[0178] Among them, the information identifying the UE includes but is not limited to the UE ID, TMSI (Temperate Mobile Station Identity), IMSI (International Mobile Subscriber Identity), etc. For the convenience of description, the following embodiment is described using the UE ID as an example.

[0179] That is, in the embodiment of the present application, the UE determines a first UL carrier from multiple first UL carriers configured with PRACH resources based on its own ID (which may be referred to as UE ID or represented as UE_ID), and the UE initiates a random access process on the determined first UL carrier to access the network, wherein UE_ID is an existing parameter for determining a paging opportunity (Paging Occasion), and UE_ID is determined by 5G-S-TMSI (5G S-Temporary Mobile Subs cription Identifier, 5G S-temporary mobile subscription identification). If the UE is configured with eDRX (extended Discontinuous Reception), then UE_ID = 5G-S-TMSI mod 4096, otherwise UE_ID = 5G-S-TMSI mod 1024, 5G-S-TMSI is a 48-bit serial number, and if the UE has not registered with the network (i.e., there is no 5G-S-TMSI), then UE_ID = 0.

[0180] Optionally, it is assumed that the number of first UL carriers used for UE offload and configured with PRACH resources is Nc in total. 1 The step of determining a first UL carrier from at least two first UL carriers based on the UE ID may include at least one of the following methods:

[0181] Method 1: performing a first modulo operation on the ID of the UE and the number of first UL carriers, and determining a first UL carrier from at least two first UL carriers based on the first modulo operation result;

[0182] Specifically, the formula n can be 1 =UE_ID mod Nc 1 Determined n 1 The first UL carrier corresponding to the value is used as the determined first UL carrier, wherein UE_ID represents the ID of the UE, Nc 1 represents the number of the first UL carrier, mod represents the modulo operation, n 1 Indicates the nth of at least two first UL carriers 1 +1 carrier.

[0183] Among them, Nc 1 The first UL carriers are arranged in ascending order according to the UL carrier index number. 1 Nc 1 The nth carrier 1 +1 carrier.

[0184] Method 1 can offload the UE accessing the network to different carriers to avoid random access congestion. In the above example, it is assumed that the weight of each first UL carrier for UE offloading is the same. For example, assuming Nc 1 =4, then the number of UEs that can be accommodated by each first UL carrier is 1 / 4 (i.e., 25%) of the total number of UEs accessing the network. In practical applications, since the bandwidth of each first UL carrier may be different, the number of UEs that can be accommodated on each first UL carrier may also be different. For example, the network may configure a UE offloading weight for each carrier, that is, first UL carriers with different weights can accommodate different numbers of UEs.

[0185] Method 2: Perform a second modulo operation on the UE ID and the sum of weights of at least two first UL carriers, and determine a first UL carrier from the at least two first UL carriers based on the second modulo operation result (compared with the sum of weights of multiple first UL carriers).

[0186] Specifically, it is assumed that the number of first UL carriers configured with PRACH resource pools for UE offloading is Nc 1 Each carrier is assigned a corresponding weight W(i), 0≤i <Nc 1 , W(i) is a positive integer, and the equation that satisfies the formula The minimum n 2 The first UL carrier corresponding to the value is used as the determined first UL carrier; wherein UE_ID represents the ID of the UE, Nc 1 represents the number of the first UL carrier, mod represents the modulo operation, n 2 Indicates the nth of at least two first UL carriers 2 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two first UL carriers, Indicates the first n of at least two first UL carriers 2 + the sum of weights corresponding to 1 first UL carrier.

[0187] In other words, if Then UE selects Nc 1 If the first UL carrier of the first UL carrier; Then UE selects Nc 1 The second first UL carrier among the first UL carriers; and so on. If Then UE selects Nc 1 The nth carrier 2 +1 first UL carrier.

[0188] (2) Random number generated by the UE;

[0189] Optionally, the UE determines a first UL carrier among at least two first UL carriers according to the comparison between the generated random number and the sum of multiple first UL carrier weights. For example, assume that the number of first UL carriers configured with PRACH resource pools for UE offloading is Nc 1 ones, and each carrier is configured with a corresponding weight W(i), 0 ≤ i < Nc 1 , W(i) is a positive integer. When the random access process is triggered, the UE generates (selects) a random number randomValue located between 0 and based on the uniform distribution, and the smallest n value that satisfies the formula 3 corresponds to the first UL carrier as the determined first UL carrier; where Nc 1 represents the number of first UL carriers, W(i) represents the weight corresponding to UL carrier i, represents the sum of the weights of at least two first UL carriers, randomValue represents the random number generated by the UE based on the uniform distribution within the range of 0 to , n 3 represents the (n 3 + 1)-th carrier among at least two first UL carriers, represents the sum of the weights of the first n 3 + 1 first UL carriers among at least two first UL carriers.

[0190] In other words, if randomValue < W(0), then the UE selects the first first UL carrier among Nc 1 first UL carriers; if W(0) ≤ randomValue < W(0) + W(1), then the UE selects the second first UL carrier among Nc 1 first UL carriers; and so on. If then the UE selects the (n 1 + 1)-th first UL carrier among Nc 3 carriers.

[0191] (3) Parameter values indicated by the UE's upper layer or determined by the MAC (Medium Access Control) layer, and the association between the parameter values and the first UL carrier;

[0192] Optionally, the UE determines a first UL carrier from at least two first UL carriers according to the parameter values indicated by the higher layer or determined by the MAC layer, and the association between the parameter values and the first UL carrier. Here, the parameter values indicated by the higher layer may be related to the service type, QoS (Quality of Service), data priority, or the triggering scenario of the random access procedure. The triggering scenarios of the random access procedure include: initial access (including entering the RRC connected state from the RRC idle state), RRC connection reestablishment, cell handover, UL out-of-synchronization, arrival of UL data in the RRC connected state, SR (Scheduling Request) failure, RRC synchronization reconfiguration request, entering the RRC connected state from the RRC inactive state, establishing time alignment when adding an SCell (Secondary Cell), requesting other system information, beam failure recovery, etc. For example, each service type, QoS, data priority, or triggering scenario of the random access procedure corresponds to a parameter value, and the value range of the parameter value is predefined. If the random access procedure is triggered by the RRC layer of the UE, the RRC layer of the UE will indicate the parameter value to the MAC layer. If the random access procedure is triggered by the MAC layer of the UE, the MAC layer of the UE can determine the parameter value, and each parameter value is associated with a first UL carrier.

[0193] There are two possible ways to associate the parameter values with the UL carriers. The first association method is predefined. For example, assume there are N1 parameter values and N2 UL carriers. They are associated in sequence according to the carrier index number. That is, after sorting by the carrier index number, the first parameter value is associated with the first UL carrier, the second parameter value is associated with the second UL carrier, the third parameter value is associated with the third UL carrier, and so on. If N1 = N2, then the association between the parameter values and the UL carriers is one-to-one. If N1 < N2, then the extra UL carriers are associated in sequence starting from the first parameter value, that is, the association between the parameter values and the UL carriers is one-to-many. If N1 > N2, then the extra parameter values are associated in sequence starting from the first UL carrier, that is, the association between the parameter values and the UL carriers is many-to-one. The second association method is preconfigured. For example, the network configures the UL carrier index number associated with each parameter value, or the network configures the parameter value associated with each UL carrier. If a parameter value is associated with multiple UL carriers, the UE randomly selects one UL carrier from them.

[0194] (4) The UL carrier index number indicated by the base station;

[0195] That is, in the embodiment of the present application, the UE determines a first UL carrier from multiple first UL carriers configured with PRACH resources based on the UL carrier index number indicated by the base station, and initiates a random access process on the determined first UL carrier to access the network.

[0196] Optionally, a UE accessing the network that is awakened by the network through a paging message can determine a first UL carrier from multiple first UL carriers configured with PRACH resources according to the UL carrier index number indicated by the PDCCH (Physical Downlink Control Channel) or PDSCH (Physical Downlink Shared Channel) where the paging message is located. When the base station sends a paging message to wake up a UE to access the network, the base station also indicates the UL carrier index number where the PRACH resources used by the UE to access the network are located.

[0197] Optionally, indicating the UL carrier index number used by the access network is indicated by the base station through at least one of the following:

[0198] 1. DCI (Downlink Control Information) carried by PDCCH for scheduling PDSCH for transmitting paging messages;

[0199] As an example, the scheduling PDCCH of the paging message includes a field for indicating the UL carrier index number, that is, indicating one from multiple first UL carriers configured with the PRACH resource pool, and all UEs (in the RRC idle state) paged by the paging message corresponding to this PDCCH access the network based on the indicated carrier. The advantage is that the network can offload UEs awakened in different paging opportunities to different first UL carriers to access the network to avoid access congestion.

[0200] 2. MAC (Medium Access Control) CE (Control Element) carried by PDSCH for transmitting paging messages;

[0201] As an example, the PDSCH of the paging message includes a MAC CE, which indicates a UL carrier index number, that is, indicates one from multiple first UL carriers configured with the PRACH resource pool, and all UEs paged by the paging message included in the PDSCH access the network based on the indicated first UL carrier. The advantage is that the network can offload UEs awakened in different paging opportunities to different first UL carriers to access the network to avoid access congestion.

[0202] Alternatively, the MAC CE indicates a UL carrier index number for different UE groups respectively. If a UE is awakened by the paging message included in the PDSCH where the MAC CE is located to access the network, the UE determines the index number of the corresponding UE group based on the UE_ID, and then uses the PRACH resources on the first UL carrier corresponding to the UE group to which it belongs to access the network. That is, the UE determines the UE group to which the UE belongs based on the UE ID, and uses the carrier with the UL carrier index number corresponding to the UE group to which the UE belongs as the determined first UL carrier. The advantage is that the network can offload different UEs awakened in the same paging opportunity to different first UL carriers to access the network to avoid access congestion.

[0203] 3. Paging message.

[0204] As an example, the paging message indicates a UL carrier index number, that is, indicates one from multiple first UL carriers configured with the PRACH resource pool, and all UEs paged by the paging message can access the network based on the first UL carrier indicated by the paging message.

[0205] (5) The downlink DL carrier where the monitored paging message is located, and the association between the DL carrier and the first UL carrier.

[0206] As an example, a UE that is awakened by the network through a paging message to access the network can determine a first UL carrier from multiple first UL carriers configured with PRACH resources according to the DL carrier where the paging message is located. The cell can configure PDCCH search spaces for monitoring paging messages on multiple DL carriers, and the UE can determine the corresponding DL carrier for monitoring paging messages according to UE_ID. Each DL carrier configured with a PDCCH search space for paging messages is associated with a first UL carrier configured with PRACH resources. The association between the two can be predefined or indicated by system information. If a UE monitors a paging message on a DL carrier and needs to access the network, the UE uses the first UL carrier configured with PRACH resources associated with this DL carrier to access the network.

[0207] In the embodiments of the present application, there are two ways to associate DL carriers with UL carriers. The first association method is predefined. For example, assuming there are N1 DL carriers and N2 UL carriers, they are associated in sequence according to the carrier index number. That is, after sorting by the carrier index number, the first DL carrier is associated with the first UL carrier, the second DL carrier is associated with the second UL carrier, the third DL carrier is associated with the third UL carrier, and so on. If N1 = N2, then the association between DL carriers and UL carriers is one-to-one. If N1 < N2, then the extra UL carriers are associated in sequence starting from the first DL carrier, that is, the association between DL carriers and UL carriers is one-to-many. If N1 > N2, then the extra DL carriers are associated in sequence starting from the first UL carrier, that is, the association between DL carriers and UL carriers is many-to-one. The second association method is pre-configured. For example, the network configures the UL carrier index number associated with each DL carrier, or the network configures the DL carrier index number associated with each UL carrier. If a DL carrier is associated with multiple UL carriers, then the UE randomly selects one UL carrier from them.

[0208] For the embodiments of the present application, at least one of the at least two first UL carriers is a SUL carrier. For example, it includes at least one SUL carrier and at least two NUL carriers, or includes at least two SUL carriers and at least one NUL carrier, etc. Or, if the at least two first UL carriers do not include a SUL carrier, then it may include at least two NUL carriers.

[0209] In the embodiments of the present application, the UE can select (determine) one UL carrier from multiple UL carriers based on the above method to send a PRACH, so as to achieve the purpose of UE offloading and reduce the probability of congestion occurring during the random access process of the UE. In other words, the UE selects (determines) one PRACH resource pool from multiple PRACH resource pools and performs a random access process on the determined PRACH resource pool, where different PRACH resource pools are configured on different UL carriers.

[0210] In an embodiment of the present application, a cell may also include multiple DL carriers, wherein a DL carrier used to transmit system information (also referred to as a cell system message) may be referred to as an anchor DL ​​carrier, and other DL carriers are referred to as non-anchor DL ​​carriers. The base station transmits CD-SSB (Cell Defining Synchornization SignalBlock, cell definition SSB), the first system information block (System Information Block 1, SIB1), and at least one of other system information on the anchor DL ​​carrier, and the base station configures other non-anchor DL ​​carriers and information of each UL carrier (including anchor UL carrier and non-anchor UL carrier) through the anchor DL ​​carrier. When the anchor DL ​​carrier is a TDD carrier, the anchor DL ​​carrier and the anchor UL carrier are the same anchor carrier; when the anchor DL ​​carrier is an FDD carrier, the anchor carrier includes an anchor DL ​​carrier and its paired anchor UL carrier. On the anchor DL ​​carrier, the initial downlink BWP (Bandwidth Part) is configured, and on the anchor UL carrier, the PRACH resources (resource pool) and the initial uplink BWP for accessing the network are configured. Based on these related configuration information, the UE can access the network through the anchor carrier.

[0211] In an embodiment of the present application, PRACH resources (resource pools) may be configured on multiple UL carriers (including anchor UL carriers), including PRACH resources for a two-step random access process, and / or MsgA resources for a four-step random access process (including PRACH resources and PUSCH (Physical Uplink Shared Channel) resources), and the UE may access the network through one of the PRACH resource pools on these multiple UL carriers.

[0212] That is, in the embodiment of the present application, at least two first UL carriers or multiple carriers belong to the same cell. Based on the above first UL carrier determination method, the UE can use one of at least two first UL carriers configured with PRACH resources to access the network, which significantly improves the flexibility of the communication system and reduces congestion when the UE accesses the network.

[0213] In the embodiment of the present application, an optional implementation manner is also provided for step S102, which may specifically include: determining a first UL carrier from at least two first UL carriers based on a measured RSRP (Reference Signal Receiving Power) value and a preset RSRP threshold value;

[0214] Alternatively, the RSRP value may be measured on the anchor DL ​​carrier.

[0215] Optionally, the RSRP threshold value includes one or at least two, and the RSRP threshold value may be configured through system information.

[0216] In the embodiment of the present application, the UE may determine a first UL carrier from multiple first UL carriers configured with PRACH resources based on a comparison of an RSRP value measured by an SSB of a serving cell with at least two preset RSRP threshold values. For example, each first UL carrier corresponds to an RSRP interval or an RSRP threshold value, and when the RSRP value measured by the UE based on the SSB is within a preset RSRP interval or is less than a preset RSRP threshold value, the corresponding first UL carrier is selected.

[0217] For example, optionally, each first UL carrier corresponds to an RSRP interval determined based on at least two preset RSRP threshold values, and based on the measured RSRP value and the at least two preset RSRP threshold values, a first UL carrier is determined in at least two first UL carriers, which may specifically include: determining the RSRP interval based on the RSRP value, and using the first UL carrier corresponding to the RSRP interval as the determined first UL carrier. That is, in the embodiment of the present application, different carriers may have different coverage ranges, and the PRACH resources on each carrier may be used for UEs within a specific coverage range to access the network.

[0218] As an example, taking the number of first UL carriers configured with PRACH resources as 3, 3 RSRP intervals can be determined based on 2 RSRP threshold values. If the RSRP value measured by the UE based on SSB is less than the first RSRP threshold value (i.e., less than the first RSRP threshold value is the first RSRP interval), then the UE selects the first first UL carrier; if the RSRP value measured by the UE based on SSB is greater than or equal to the first RSRP threshold value, and less than the second RSRP threshold value (i.e., greater than or equal to the first RSRP threshold value, and less than the second RSRP threshold value is the second RSRP interval), then the UE selects the second first UL carrier; if the RSRP value measured by the UE based on SSB is greater than or equal to the second RSRP threshold value (i.e., greater than or equal to the second RSRP threshold value is the third RSRP interval), then the UE selects the third first UL carrier. Among them, the second RSRP threshold value is greater than the first RSRP threshold value, and the first RSRP threshold value and the second RSRP threshold value can be configured through the system information of the cell.

[0219] It can be understood that the above-mentioned methods of determining a first UL carrier from at least two first UL carriers can be combined. As an example, based on the measured RSRP value and the preset RSRP threshold value, and the above-mentioned at least one parameter (i.e., at least one parameter used to determine a first UL carrier from at least two first UL carriers in step S102), a first UL carrier from at least two first UL carriers can be determined. Specifically, it can include but is not limited to at least one of the following methods:

[0220] (1) the at least two first UL carriers include at least two NUL carriers and one SUL carrier. If the RSRP value is less than or equal to a preset first RSRP threshold value, the SUL carrier is used as the determined first UL carrier. If the RSRP value is greater than the first RSRP threshold value, a first UL carrier is determined from the at least two NUL carriers based on the at least one parameter.

[0221] Taking the measured RSRP value and the preset RSRP threshold value and UE ID as an example, that is, in the embodiment of the present application, a cell can be configured with multiple NUL carriers and at most one SUL carrier, and the above-mentioned method of unloading UE based on UE ID is used for multiple NUL carriers. Optionally, in the above-mentioned method 1 and method 2, the number of first UL carriers Nc used to unload the UE is 1 It is the number of all UL carriers configured with the PRACH resource pool except the SUL carrier. For example, the UE can compare the RSRP value obtained based on the SSB measurement with the preset first RSRP threshold value (such as the existing parameter rsrp-ThresholdSSB-SUL). If the measured RSRP value is lower than the preset first RSRP threshold value, then the SUL carrier is selected to initiate the RACH process to access the network; if the measured RSRP value is higher than the preset first RSRP threshold value, then the above-mentioned method 1 or method 2 is used to select one from multiple NUL carriers based on the UE ID to access the network, that is, the RACH process is initiated on the selected NUL.

[0222] (2) The at least two first UL carriers include at least two NUL carriers and at least two SUL carriers. If the RSRP value is less than or equal to a preset first RSRP threshold value, a first UL carrier is determined from the at least two SUL carriers based on the at least one parameter. If the RSRP value is greater than the first RSRP threshold value, a first UL carrier is determined from the at least two NUL carriers based on the at least one parameter.

[0223] Taking the measured RSRP value and the preset RSRP threshold value and UE ID as an example, that is, in the embodiment of the present application, a cell can be configured with multiple SUL carriers and multiple NUL carriers, that is, in the above method one and method two, the UL carriers used to unload the UE are divided into two groups, namely, the NUL group and the SUL group, and the first UL carrier number used to unload the UE is the number of SULs configured with PRACH resources and the number of NULs configured with PRACH resources. For example, the RSRP value obtained based on the SSB measurement is compared with the preset first RSRP threshold value (such as the existing parameter rsrp-ThresholdSSB-SUL). If the measured RSRP value is lower than the preset second RSRP threshold value, then the above method one or method two is used to select one from multiple SUL carriers based on the UE ID to access the network; if the measured RSRP value is higher than the preset first RSRP threshold value, then the above method one or method two is used to select one from multiple NUL carriers based on the UE ID to access the network.

[0224] (3) the at least two first UL carriers include at least one NUL carrier and at least two SUL carriers, if the RSRP value is less than or equal to a preset first RSRP threshold value, a first UL carrier is determined from the at least two SUL carriers based on the at least one parameter, and if the RSRP value is greater than the first RSRP threshold value, the NUL carrier is used as the determined first UL carrier;

[0225] Taking the measured RSRP value and the preset RSRP threshold value and UE ID as an example, that is, in the embodiment of the present application, a cell can be configured with multiple SUL carriers and a maximum of one NUL carrier, and the above-mentioned method of unloading UE based on UE ID is used for multiple SUL carriers. Optionally, in the above-mentioned method 1 and method 2, the number of first UL carriers Nc used to unload the UE is 1 It is the number of all UL carriers configured with the PRACH resource pool except the NUL carrier. For example, the UE can compare the RSRP value obtained based on the SSB measurement with the preset first RSRP threshold value (such as the existing parameter rsrp-ThresholdSSB-SUL). If the measured RSRP value is lower than the preset first RSRP threshold value, then use the above method 1 or method 2 to select one from multiple SUL carriers based on the UE ID to access the network, that is, initiate a RACH process on the selected SUL; if the measured RSRP value is higher than the preset first RSRP threshold value, then select the NUL carrier to initiate the RACH process to access the network.

[0226] In the embodiment of the present application, when the UE fails to initiate a random access process on the determined first UL carrier (including but not limited to a case where a predetermined number of consecutive random access processes are unsuccessful), the step may further include: switching to at least one of the following target UL carriers, and continuing to initiate a random access process on the target UL carrier:

[0227] (1) The UL carrier corresponding to the DL carrier that transmits the system message (i.e., the anchor DL ​​carrier)

[0228] That is, it is possible to switch to an anchor UL carrier configured with PRACH resources, for example, to a carrier that transmits CD-SSB and SIB (System Information Block) (corresponding to the case of a TDD carrier), or to a UL carrier paired with a DL carrier that transmits CD-SSB and SIB (corresponding to the case of an FDD carrier).

[0229] (2) The UL carrier with the smallest UL carrier index

[0230] For example, the mobile station may switch to the first UL carrier which has the smallest UL carrier index and is configured with PRACH resources.

[0231] (3) UL carrier indicated by the base station. The UL carrier indicated by the base station is indicated by system information or by a MAC subheader included in a Random Access Response Medium Access Control Protocol Data Unit (RAR MAC PDU).

[0232] That is, it is possible to switch to the default UL carrier indicated by the base station, wherein the default carrier may be pre-configured by the base station through the SIB, or the target UL carrier to be switched when the RACH process indicated by the MAC subheader carried by the RAR MAC PDU is unsuccessful, for example, by indicating the UL carrier index number of the target UL carrier through a newly defined MAC subheader. Alternatively, some indication bits of the existing Backoff Indicator are used, for example, the last two bits of the existing BackoffIndicator indication field are used to indicate the UL carrier index number of the target UL carrier, or only the first two bits of the BackoffIndicator indication field are used to indicate 4 preset Backoff values. If the base station does not pre-configure the default UL carrier, then switch to the anchor carrier.

[0233] (4) A UL carrier with a lower frequency than the first UL carrier used for PRACH transmission (i.e., a UL carrier with a lower frequency than the first UL carrier determined previously)

[0234] For example, the first UL carrier with a lower frequency than the previous first UL carrier for initiating RACH and configured with PRACH resources may be switched to. Optionally, if there are multiple UL carriers with a lower frequency than the previous first UL carrier for initiating RACH and configured with PRACH resources, one carrier may be selected from them.

[0235] Optionally, based on at least one of the following methods, one is selected as a target UL carrier from multiple UL carriers with a lower frequency than the first UL carrier used for PRACH transmission: randomly selecting a UL carrier; selecting the UL carrier with the smallest UL carrier index number; selecting the UL carrier with the highest frequency; selecting the UL carrier with the lowest frequency.

[0236] (5) SUL carrier

[0237] That is, switch to the SUL carrier configured with PRACH resources. If the cell is configured with multiple SUL carriers and each SUL carrier is configured with PRACH resources, then a SUL carrier can be randomly selected from them, or a SUL carrier with the lowest frequency can be selected from them.

[0238] For an embodiment of the present application, in one example, if the UE fails to initiate one or more consecutive random access processes on the selected first UL carrier, and the selected carrier is a NUL carrier, the UE can switch to other carriers determined in the above manner to continue to initiate a RACH process to access the network.

[0239] In the embodiment of the present application, the step of switching to the target UL carrier and continuing to initiate the random access process on the target UL carrier includes at least one of the following situations:

[0240] (1) If the random access process is still unsuccessful after the PRACH power is increased to the maximum transmit power, the carrier is switched to the target UL carrier and the random access process is continued on the target UL carrier at the maximum transmit power or the initial transmit power;

[0241] That is, the carrier switching after the RACH process is unsuccessful should be after the PRACH power climbs. That is, if the RACH process initiated by the UE on the selected first UL carrier is unsuccessful, then the RACH process is initiated again by increasing the PRACH transmission power. Only when the RACH process is still unsuccessful after the PRACH climbs to the maximum transmission power, the RACH process is switched to the target UL carrier to initiate the RACH process, and the PRACH is sent at the maximum transmission power on the target UL carrier, or the PRACH is sent at the initial transmission power on the target UL carrier.

[0242] (2) Switching to the target UL carrier, if the random access procedure is still unsuccessful after initiating the random access procedure on the target UL carrier, the random access procedure is initiated again after increasing the transmit power of the PRACH on the target UL carrier.

[0243] That is, the carrier switching after the RACH process is unsuccessful can be before the power of PRACH is increased. That is, if the RACH process initiated by the UE on the selected first UL carrier is unsuccessful, then switch to other UL carriers. If the RACH process initiated on other UL carriers is unsuccessful, then increase the transmission power of PRACH on other UL carriers and initiate the RACH process again.

[0244] In the method performed by the UE in the communication system provided in the embodiment of the present application, the UE can access the network using one of at least two first UL carriers configured with PRACH resources based on any of the above determination methods, which significantly improves the flexibility of the communication system and reduces congestion when the UE accesses the network.

[0245] In the embodiment of the present application, the system information received in step S101 also includes configuration information related to PUCCH (Physical Uplink Control Channel) resources on at least two second UL carriers, and the method performed by the UE in the communication system may also include:

[0246] Step S201: determining a second UL carrier from at least two second UL carriers;

[0247] Step S202: Send a PUCCH on the determined second UL carrier based on the determined PUCCH resource corresponding to the second UL carrier.

[0248] For steps S201 and S202, the method for the UE to determine a second UL carrier among at least two second UL carriers described in the embodiment of the present application can be understood as a method for the UE to determine a PUCCH configuration (resource) among at least two PUCCH configurations (resources), that is, the UE determines a PUCCH configuration (resource) among at least two PUCCH configurations (resources), and sends PUCCH based on the determined PUCCH configuration (resource), wherein different PUCCH configurations (resources) correspond to different UL carriers.

[0249] Optionally, based on the determined PUCCH resource corresponding to the second UL carrier, before receiving UE-specific PUCCH configuration information, the PUCCH is sent on the determined second UL carrier.

[0250] In an embodiment of the present application, multiple UL carriers are configured on a cell, and common PUCCH resources are configured on each UL carrier, wherein the multiple UL carriers belong to the same cell, and the UE can select one from the PUCCH resources on the multiple UL carriers for PUCCH transmission before receiving UE-specific PUCCH configuration information (also referred to as PUCCH resource configuration information, used for PUCCH resource configuration), including the PUCCH corresponding to the ACK (Acknowledge, ACK) of Msg4 (the fourth step message of the four-step random access process), the PUCCH corresponding to the ACK of the success RAR (Success Random Access Response) included in MsgB (the second step message of the two-step random access process), and the PUCCH corresponding to the ACK / NACK (Negative ACKnowledgement, denial character) of other PDSCHs.

[0251] In the embodiment of the present application, the at least two second UL carriers may be completely identical or partially identical to the at least two first UL carriers (for example, at least one UL carrier belongs to both the first UL carrier and the second UL carrier), or may be completely different (for example, a cell includes at least four UL carriers).

[0252] In the embodiment of the present application, some optional implementations are provided for step S201, specifically, at least one of the following methods may be included:

[0253] Method (1): using the first UL carrier used for PRACH transmission as the determined second UL carrier;

[0254] In the embodiment of the present application, the UE sends PRACH on a carrier (the first UL carrier) to access the network. If the carrier is also configured with common PUCCH resources (that is, the first UL carrier is also a second UL carrier), the UE sends the PUCCH before receiving the UE-specific PUCCH resource configuration based on the PUCCH resources on the carrier. If the first UL carrier is not configured with common PUCCH resources (that is, the first UL carrier is not a second UL carrier), the UE sends the PUCCH before receiving the UE-specific PUCCH resource configuration based on the PUCCH resources on other carriers (the determined second UL carrier).

[0255] Mode (2): Based on the first UL carrier used for PRACH transmission and the association between the first UL carrier and the second UL carrier, determine a second UL carrier from at least two second UL carriers;

[0256] In an embodiment of the present application, the determined second UL carrier may be a carrier associated with the carrier of the PRACH resource used by the UE (the determined first UL carrier), that is, each first UL carrier configured with PRACH resources is associated with a second UL carrier configured with PUCCH resources, and the association between the two may be predefined or indicated by the network. This method (2) may be combined with the above method (1), for example, method (2) is used to determine other carriers in the above method (1). Method (1) is used preferentially. If the first UL carrier that initiates the random access process is not configured with PUCCH resources, method (2) is used to determine the second UL carrier.

[0257] Mode (3): Based on the association between the PRACH resources and the PUCCH resources, a second UL carrier is determined from at least two second UL carriers;

[0258] In an embodiment of the present application, the determined second UL carrier may be a carrier corresponding to a PUCCH resource associated with a PRACH resource used by the UE, that is, each configured PRACH resource is associated with a configured PUCCH resource, and the association between the two may be predefined or indicated by the network. This method (3) may be combined with the above method (1), for example, method (3) is used to determine other carriers in the above method (1). Method (1) is used preferentially. If no PUCCH resource is configured on the first UL carrier that initiates the random access process, method (3) is used to determine the second UL carrier.

[0259] Mode (4): using the second UL carrier with the smallest UL carrier index number as the determined second UL carrier;

[0260] In the embodiment of the present application, the method (4) can also be combined with the above method (1). For example, the other carrier in the above method (1) can be the second UL carrier with the smallest UL carrier index number and configured with common PUCCH resources. Method (1) is used preferentially. If the first UL carrier that initiates the random access process is not configured with PUCCH resources, then method (4) is used to determine the second UL carrier.

[0261] Mode (5): Based on the indication of RAR (Random Access Response) in Msg2 (second step message of four-step random access procedure), or based on the indication of scheduling DCI in Msg4, or the indication of successRAR included in MsgB, a second UL carrier is determined from at least two second UL carriers.

[0262] In an embodiment of the present application, for the four-step random access process, the second UL carrier where the PUCCH transmission is located before receiving the UE-specific PUCCH resource configuration can be indicated by the RAR of Msg2, and the RAR of Msg2 includes a field for indicating the UL carrier index number where the PUCCH resource is located, or the second UL carrier where the PUCCH transmission is located before receiving the UE-specific PUCCH resource configuration can be indicated by the scheduling DCI of Msg4, and the scheduling DCI of Msg4 includes a field for indicating the UL carrier index number where the PUCCH resource is located, that is, the UE determines a second UL carrier from multiple second UL carriers configured with common PUCCH resources according to the indication of the RAR of Msg2 or the scheduling DCI of Msg4, and uses the PUCCH resources on the determined second UL carrier to transmit PUCCH until the UE receives the UE-specific PUCCH resource configuration.

[0263] For the two-step random access process, the success RAR included in MsgB can indicate the second UL carrier where the PUCCH transmission is located before receiving the UE-specific PUCCH resource configuration. The success RAR included in MsgB contains a field for indicating the UL carrier index number where the PUCCH resource is located, that is, the UE determines a second UL carrier from multiple second UL carriers configured with common PUCCH resources according to the indication of the success RAR included in MsgB, and uses the PUCCH resources on the determined second UL carrier to transmit PUCCH until the UE receives the UE-specific PUCCH resource configuration.

[0264] Method (6): Based on the UE ID, determine a second UL carrier from at least two second UL carriers

[0265] Among them, the introduction of UE ID can be found above and will not be repeated here.

[0266] Optionally, assuming that the number of second UL carriers configured with common PUCCH resources is Nc in total 2 The step of determining a second UL carrier from at least two second UL carriers based on the UE ID may include at least one of the following methods:

[0267] Method 1: performing a third modulo operation on the ID of the UE and the number of the second UL carriers, and determining a second UL carrier from at least two second UL carriers based on the result of the third modulo operation;

[0268] Specifically, the formula n 4 =UE_ID mod Nc 2 Determined n 4 The second UL carrier corresponding to the value is used as the determined second UL carrier; wherein UE_ID represents the ID of the UE, Nc 2 represents the number of the second UL carrier, mod represents the modulo operation, n 4 represents the nth of the at least two second UL carriers 4 +1 carrier.

[0269] Method 2: Perform a fourth modulo operation on the sum of the UE ID and the weights of the at least two second UL carriers, and determine a second UL carrier from the at least two second UL carriers based on the fourth modulo operation result.

[0270] Specifically, the formula The minimum n 5 The second UL carrier corresponding to the value is used as the determined second UL carrier; wherein UE_ID represents the ID of the UE, Nc 2 represents the number of the second UL carrier, mod represents the modulo operation, n 5 represents the nth of the at least two second UL carriers 5 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two second UL carriers, Indicates the first n of at least two second UL carriers 5 + the sum of weights corresponding to 1 second UL carrier.

[0271] Wherein, if it is not pointed out in detail, reference may be made to the introduction of the method for determining one from multiple first UL carriers configured with PRACH resources based on UE ID in the foregoing text, which will not be repeated here.

[0272] In the embodiment of the present application, the system information received in step S101 further includes configuration information related to the initial uplink BWP on at least two third UL carriers, and the method performed by the UE in the communication system may further include:

[0273] Step S301: determining a third UL carrier from at least two third UL carriers;

[0274] Step S302: based on the determined initial uplink BWP corresponding to the third UL carrier, send a PUSCH on the determined third UL carrier.

[0275] For steps S301 and S302, the method for the UE to determine a third UL carrier from at least two third UL carriers described in the embodiment of the present application can also be understood as a method for the UE to determine an initial uplink BWP from at least two initial uplink BWPs, that is, the UE determines an initial uplink BWP from at least two initial uplink BWPs, and sends a PUSCH based on the determined initial uplink BWP, wherein different initial uplink BWPs correspond to different UL carriers.

[0276] Optionally, based on the determined initial uplink BWP corresponding to the third UL carrier, before establishing the RRC connected state, a PUSCH is sent on the determined third UL carrier.

[0277] In an embodiment of the present application, multiple UL carriers are configured on a cell, and an initial uplink BWP is configured on each UL carrier, wherein the multiple UL carriers belong to the same cell, and the UE can select one from the initial uplink BWPs on the multiple UL carriers for sending Msg3 (the third step message of the four-step random access process) and the PUSCH before receiving the first activated uplink BWP configuration (firstActiveUplinkBWP-Id) in the RRC connected state.

[0278] In the embodiment of the present application, the at least two third UL carriers and the at least two first UL carriers may be completely identical or partially identical (for example, at least one UL carrier belongs to both the first UL carrier and the third UL carrier), or may be completely different.

[0279] In the embodiment of the present application, some optional implementations are provided for step S301, specifically, at least one of the following methods may be included:

[0280] (1) if the configuration information related to the initial uplink BWP related to the determined first UL carrier is received, the determined first UL carrier is used as the determined third UL carrier;

[0281] In the embodiment of the present application, if the initial uplink BWP is configured on the first UL carrier where the PRACH resource used by the UE to access the network is located (that is, the first UL carrier is also a third UL carrier), then the UE sends Msg3 based on the carrier where the PRACH resource is located;

[0282] (2) if the configuration information related to the initial uplink BWP related to the determined first UL carrier is not received, the UL carrier corresponding to the DL carrier transmitting the system message (i.e., the anchor UL carrier) is used as the determined third UL carrier, or a third UL carrier is determined from at least two third UL carriers;

[0283] In an embodiment of the present application, if the initial uplink BWP is not configured on the first UL carrier where the PRACH resource used by the UE to access the network is located (that is, the first UL carrier is not a third UL carrier), then the UE sends Msg3 based on the initial uplink BWP on the anchor carrier, or the UE determines an initial uplink BWP on a third UL carrier based on the network configuration to send Msg3.

[0284] (3) determining a third UL carrier from at least two third UL carriers based on the UL carrier index number indicated in the random access response RAR;

[0285] In the embodiment of the present application, the UL carrier index number of the third UL carrier used to transmit Msg3 is indicated in the RAR, and the UE determines a third UL carrier to send Msg3 according to the indication of the RAR. This method can be combined with the above scheme. For example, if the first UL carrier where the PRACH resource used by the UE to access the network is located is not configured with an initial uplink BWP, the UE determines a third UL carrier to send Msg3 according to the indication of the RAR.

[0286] (4) Based on the ID of the UE, determine a third UL carrier from at least two third UL carriers.

[0287] Among them, the introduction of UE ID can be found above and will not be repeated here.

[0288] Optionally, assuming that the number of third UL carriers configured with initial uplink BWP is Nc in total 3 The step of determining a third UL carrier from at least two third UL carriers based on the UE ID may include at least one of the following methods:

[0289] Method 1: performing a fifth modulo operation on the ID of the UE and the number of third UL carriers, and determining a third UL carrier from at least two third UL carriers based on the result of the fifth modulo operation;

[0290] Specifically, the formula n 6=UE_ID mod Nc 3 Determined n 6 The third UL carrier corresponding to the value is used as the determined third UL carrier; wherein UE_ID represents the ID of the UE, Nc 3 represents the number of the third UL carrier, mod represents the modulo operation, n 6 Indicates the nth of at least two third UL carriers 6 +1 carrier.

[0291] Method 2: Perform a sixth modulo operation on the sum of the UE ID and the weights of at least two third UL carriers, and determine a third UL carrier from the at least two third UL carriers based on the sixth modulo operation result.

[0292] Specifically, the formula The minimum n 7 The third UL carrier corresponding to the value is used as the determined third UL carrier; wherein UE_ID represents the ID of the UE, Nc 3 represents the number of the third UL carrier, mod represents the modulo operation, n 7 Indicates the nth of at least two third UL carriers 7 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two third UL carriers, Indicates the first n of at least two third UL carriers 7 + the sum of weights corresponding to 1 third UL carrier.

[0293] Wherein, if it is not pointed out in detail, reference may be made to the introduction of the method for determining one from multiple first UL carriers configured with PRACH resources based on UE ID in the foregoing text, which will not be repeated here.

[0294] In the embodiment of the present application, the system information received in step S101 further includes configuration information related to the initial downlink BWP on at least two first DL carriers, and the method performed by the UE in the communication system may further include:

[0295] Step S401: determining a first DL carrier from at least two first DL carriers;

[0296] Step S402: Based on the determined initial downlink BWP corresponding to the first DL carrier, a PDCCH and a PDSCH are received on the determined first DL carrier.

[0297] For steps S401 and S402, the method for the UE to determine a first DL carrier from at least two first DL carriers described in the embodiment of the present application can also be understood as a method for the UE to determine an initial downlink BWP from at least two initial downlink BWPs, that is, the UE determines an initial downlink BWP from at least two initial downlink BWPs, and receives PDCCH and PDSCH based on the determined initial downlink BWP, wherein different initial downlink BWPs correspond to different DL carriers.

[0298] Optionally, based on the determined initial downlink BWP corresponding to the first DL carrier, before establishing the RRC connected state, a PDCCH and a PDSCH are received on the determined first DL carrier.

[0299] In an embodiment of the present application, multiple DL carriers are configured on a cell, and initial downlink BWPs are configured on these multiple DL carriers, and PDCCH search spaces for monitoring RAR are configured on respective initial downlink BWPs, wherein these multiple DL carriers belong to the same cell, and the UE can select one of the initial downlink BWPs on these multiple DL carriers for receiving PDCCH and PDSCH, for example, monitoring the scheduling PDCCH of Msg2, Msg4 or MsgB on the determined initial downlink BWP, and the PDCCH before establishing the RRC connection state, that is, the PDCCH before receiving the first activated uplink BWP configuration (firstActiveUplinkBWP-Id).

[0300] In the embodiment of the present application, the first DL carrier may include or exclude an anchor DL ​​carrier.

[0301] In the embodiment of the present application, some optional implementations are provided for step S401, specifically, at least one of the following methods may be included:

[0302] (1) determining a first DL carrier from among at least two first DL carriers based on the determined first UL carrier and an association between the first UL carrier and the first DL carrier;

[0303] In an embodiment of the present application, each first UL carrier configured with PRACH resources is associated with a first DL carrier configured with a PDCCH search space of RAR, and the association between the two is predefined or indicated by the network. If a UE sends PRACH on a first UL carrier to access the network, the UE monitors Msg2, Msg4 or MsgB on the initial downlink BWP of the first DL carrier associated with the first UL carrier.

[0304] (2) Determine a first DL carrier from at least two first DL carriers based on the ID of the UE.

[0305] Among them, the introduction of UE ID can be found above and will not be repeated here.

[0306] Optionally, assuming that the number of first DL carriers in the PDCCH search space configured with RAR is Nc in total 4 The step of determining a first DL carrier from at least two first DL carriers based on the ID of the UE may include at least one of the following methods:

[0307] Method 1: performing a seventh modulo operation on the ID of the UE and the number of first DL carriers, and determining a first DL carrier from at least two first DL carriers based on a result of the seventh modulo operation;

[0308] Specifically, the formula n 8 =UE_ID mod Nc 4 Determined n 8 The first DL carrier corresponding to the value is used as the determined first DL carrier; wherein UE_ID represents the ID of the UE, Nc 4 represents the number of the first DL carrier, mod represents the modulo operation, n 8 represents the nth of at least two first DL carriers 8 +1 carrier.

[0309] Method 2: performing an eighth modulo operation on the sum of the ID of the UE and the weights of at least two first DL carriers, and determining a first DL carrier from the at least two first DL carriers based on the result of the eighth modulo operation.

[0310] Specifically, the formula The minimum n 9 The first DL carrier corresponding to the value is used as the determined first DL carrier; wherein UE_ID represents the ID of the UE, Nc 4 represents the number of the first DL carrier, mod represents the modulo operation, n 9 represents the nth of at least two first DL carriers 9 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of weights of at least two first DL carriers, Indicates the first n of at least two first DL carriers 9 + the sum of weights corresponding to 1 first DL carrier.

[0311] Wherein, if it is not pointed out in detail, reference may be made to the introduction of the method for determining one from multiple first UL carriers configured with PRACH resources based on UE ID in the foregoing text, which will not be repeated here.

[0312] In the embodiment of the present application, the system information received in step S101 also includes configuration information related to a paging PDCCH search space for monitoring paging messages on at least two second DL carriers. The method performed by the UE in the communication system may further include:

[0313] Step S501: determining a second DL carrier from at least two second DL carriers based on the ID of the UE;

[0314] Step S502: Based on the determined paging PDCCH search space corresponding to the second DL carrier, monitor the scheduling PDCCH of the paging message on the determined second DL carrier.

[0315] For steps S501 and S502, the method for the UE to determine a second DL carrier among at least two second DL carriers described in the embodiment of the present application can also be understood as a method for the UE to determine a paging PDCCH search space among at least two paging PDCCH search spaces, that is, the UE determines a paging PDCCH search space among at least two paging PDCCH search spaces, and monitors the scheduling PDCCH of the paging message based on the determined paging PDCCH search space, wherein different paging PDCCH search spaces correspond to different DL carriers.

[0316] In an embodiment of the present application, multiple DL carriers are configured on a cell, and each DL carrier is configured with a PDCCH search space (Paging PDCCH search space) for monitoring paging messages, wherein the multiple DL carriers belong to the same cell, and the UE can select one from the PDCCH search spaces corresponding to the paging messages on the multiple DL carriers to monitor the PDCCH of the paging message.

[0317] In the embodiment of the present application, the second DL carrier may include or exclude an anchor DL ​​carrier.

[0318] In an embodiment of the present application, the UE determines a second DL carrier from multiple second DL carriers configured with Paging PDCCH search space based on the UE ID, and the UE monitors the PDCCH of Paging on the determined second DL carrier, wherein the UE_ID is determined by 5G-S-TMSI, and if the UE is configured with eDRX, then UE_ID = 5G-S-TMSI mod 4096, otherwise UE_ID = 5G-S-TMSI mod 1024.

[0319] Specifically, it is assumed that the carriers configured with the Paging PDCCH search space have Nc 5 The step of determining a second DL carrier from at least two second DL carriers based on the ID of the UE may include at least one of the following methods:

[0320] Method three: determining a paging opportunity index number based on the UE ID, performing a ninth modulo operation on the paging opportunity index number and the number of second DL carriers, and determining a second DL carrier from at least two second DL carriers based on a result of the ninth modulo operation;

[0321] Specifically, the formula n 10 =floor(UE_ID / (N*Ns))mod Nc 5 Determined n 10 The second DL carrier corresponding to the value is used as the determined second DL carrier; wherein UE_ID represents the ID of the UE, N and Ns are parameters for determining the paging opportunity index number, floor represents a rounding operation, floor(UE_ID / (N*Ns)) represents the determined paging opportunity index number, Nc 5 Indicates the number of second DL carriers, mod indicates modulo operation, n 10 represents the nth of at least two second DL carriers 10 +1 carrier.

[0322] Among them, Nc 5 The second DL carriers are arranged in ascending order according to the DL carrier index number. UE_ID, N and Ns are all existing parameters used to determine the paging opportunity index number. N is the total number of paging frames within a period of time T, and Ns is the number of paging opportunities in a paging frame. The values ​​of N and Ns are configured by the network through system information.

[0323] This solution can offload UEs monitoring the same PO (Paging Occasion) to different second DL carriers to avoid paging congestion. In the above example, it is assumed that the weight of each second DL carrier for UE offloading is the same. For example, assuming Nc 5 =4, then each second DL carrier can offload 1 / 4 (i.e. 25%) of the total number of UEs monitoring the same PO. In practical applications, since the bandwidth of each second DL carrier is different, the number of UEs that can be offloaded on each second DL carrier may also be different. For example, the network can configure the weight of the UE that can be offloaded for each carrier, that is, carriers with different weights can offload different numbers of UEs.

[0324] Method 4: Assume that the second DL carrier configured with the Paging PDCCH search space has Nc 5 Each second DL carrier is configured with a corresponding weight W(i), 0≤i <Nc 1, W(i) is a positive integer, then the UE can determine the paging opportunity index number based on the UE ID, perform a tenth modulo operation on the sum of the paging opportunity index number and the weights of at least two second DL carriers, and determine a second DL carrier from the at least two second DL carriers based on the tenth modulo operation result.

[0325] Specifically, the formula The minimum n 11 The second DL carrier corresponding to the value is used as the determined second DL carrier; wherein UE_ID represents the ID of the UE, N and Ns are parameters for determining the paging opportunity index number, floor represents a rounding operation, floor(UE_ID / (N*Ns)) represents the determined paging opportunity index number, Nc 5 Indicates the number of second DL carriers, mod indicates modulo operation, n 11 represents the nth of at least two second DL carriers 11 +1 carrier, W(i) represents the weight corresponding to UL carrier i, represents the sum of the weights of at least two carriers, Indicates the first n of at least two second DL carriers 11 + the sum of weights corresponding to 1 second DL carrier.

[0326] In other words, if Then UE selects Nc 5 a first second DL carrier among the second DL carriers; if Then UE selects Nc 5 The second second DL carrier among the second DL carriers; and so on. If Then UE selects Nc 5 nth of the second DL carriers 11 +1 second DL carrier.

[0327] An electronic device is provided in an embodiment of the present application, including a transceiver configured to send and receive signals; and a processor coupled to the transceiver and configured to implement the steps of the aforementioned method embodiments. Optionally, the electronic device may refer to a UE, and the processor is configured to implement the steps of the various method embodiments executed by the UE. The detailed functional description and the beneficial effects produced can be specifically referred to the description of the various method embodiments executed by the UE in the foregoing text, which will not be repeated here. In practical applications, UE or base station can be understood as different network nodes.

[0328] An embodiment of the present application also provides an electronic device, which includes a processor and, optionally, may also include a transceiver and / or a memory coupled to the processor, and the processor is configured to execute the steps of the method provided in any optional embodiment of the present application.

[0329] Figure 5 A schematic diagram of the structure of an electronic device applicable to an embodiment of the present invention is shown in FIG. Figure 5 As shown, Figure 5 The electronic device 4000 shown includes: a processor 4001 and a memory 4003. The processor 4001 and the memory 4003 are connected, such as through a bus 4002. Optionally, the electronic device 4000 may also include a transceiver 4004, which can be used for data interaction between the electronic device and other electronic devices, such as data transmission and / or data reception. It should be noted that in actual applications, the transceiver 4004 is not limited to one, and the structure of the electronic device 4000 does not constitute a limitation on the embodiments of the present application. Optionally, the electronic device may be a first network node, a second network node, or a third network node.

[0330] 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 various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. Processor 4001 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0331] The bus 4002 may include a path to transmit information between the above components. The bus 4002 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 4002 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0332] The memory 4003 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical disk storage, optical disk storage (including compressed optical disk, laser disk, optical disk, digital versatile disk, Blu-ray disk, etc.), magnetic disk storage media, other magnetic storage devices, or any other medium that can be used to carry or store computer programs and can be read by a computer, without limitation herein.

[0333] The memory 4003 is used to store the computer program for executing the embodiment of the present application, and the execution is controlled by the processor 4001. The processor 4001 is used to execute the computer program stored in the memory 4003 to implement the steps shown in the above method embodiment.

[0334] An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps and corresponding contents of the aforementioned method embodiment can be implemented.

[0335] The embodiment of the present application also provides a computer program product, including a computer program, which can implement the steps and corresponding contents of the aforementioned method embodiment when executed by a processor.

[0336] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that shown or described in the drawings.

[0337] It should be understood that, although each operation step is indicated by arrows in the flowchart of the embodiment of the present application, the implementation order of these steps is not limited to the order indicated by the arrows. Unless clearly stated herein, in some implementation scenarios of the embodiment of the present application, the implementation steps in each flowchart can be performed in other orders according to demand. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on actual implementation scenarios. Some or all of these sub-steps or stages may be executed at the same time, and each sub-step or stage in these sub-steps or stages may also be executed at different times respectively. In different scenarios of execution time, the execution order of these sub-steps or stages may be flexibly configured according to demand, and the embodiment of the present application does not limit this.

[0338] The above text and drawings are provided only as examples to help readers understand the present disclosure. They are not intended and should not be interpreted as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, based on the contents disclosed herein, it is obvious to those skilled in the art that the embodiments and examples shown can be changed without departing from the scope of the present disclosure, and other similar implementation means based on the technical ideas of the present application are adopted, which also belong to the protection scope of the embodiments of the present application.

Claims

1. A method performed by a user equipment UE in a communication system, characterized in that: The method includes: receiving system information, where the system information includes configuration information related to physical random access channel (PRACH) resources corresponding to at least two first uplink (UL) carriers; Determine a first UL carrier from the at least two first UL carriers based on at least one of the following parameters, and perform a random access procedure based on the PRACH resource corresponding to the determined first UL carrier: The ID of the UE; A random number generated by the UE; a parameter value indicated by a higher layer of the UE or determined by a media access control MAC layer, and an association between the parameter value and a first UL carrier; UL carrier index number indicated by the base station; The downlink DL carrier where the monitored paging message is located, and the association between the DL carrier and the first UL carrier.

2. The method according to claim 1, characterized in that Determining a first UL carrier among the at least two first UL carriers further includes: Based on the measured reference signal received power RSRP value and a preset RSRP threshold value, a first UL carrier is determined from the at least two first UL carriers.

3. The method according to claim 2, characterized in that The RSRP threshold values ​​include at least two, each first UL carrier corresponds to an RSRP interval determined based on the at least two preset RSRP threshold values, and determining a first UL carrier from the at least two first UL carriers based on the measured RSRP value and the at least two preset RSRP threshold values ​​includes: An RSRP interval is determined based on the RSRP value, and a first UL carrier corresponding to the RSRP interval is used as the determined first UL carrier.

4. The method according to claim 2, characterized in that: Determining, based on the ID of the UE, a first UL carrier from the at least two first UL carriers, includes at least one of the following methods: performing a first modulo operation on the ID of the UE and the number of first UL carriers, and determining a first UL carrier from the at least two first UL carriers based on a result of the first modulo operation; A second modulo operation is performed on the sum of the ID of the UE and the weights of the at least two first UL carriers, and a first UL carrier is determined from among the at least two first UL carriers based on the second modulo operation result.

5. The method according to claim 4, characterized in that Determining, based on the ID of the UE, a first UL carrier from the at least two first UL carriers, includes at least one of the following methods: The first UL carrier corresponding to the value of n1 determined by the formula n1=UE_ID mod Nc1 is used as the determined first UL carrier; will satisfy the formula The first UL carrier corresponding to the minimum n2 value is used as the determined first UL carrier; Wherein, UE_ID represents the ID of the UE, Nc1 represents the number of first UL carriers, mod represents a modulo operation, n1 represents the n1+1th carrier of the at least two first UL carriers, n2 represents the n2+1th carrier of the at least two first UL carriers, W(i) represents the weight corresponding to UL carrier i, represents the sum of the weights of the at least two first UL carriers, represents the sum of weights corresponding to the first n2+1 first UL carriers among the at least two first UL carriers.

6. The method according to claim 1, characterized in that Determining a first UL carrier from the at least two first UL carriers based on a random number generated by the UE includes: will satisfy the formula The first UL carrier corresponding to the minimum n3 value is used as the determined first UL carrier; Wherein, Nc1 represents the number of first UL carriers, W(i) represents the weight corresponding to UL carrier i, represents the sum of the weights of the at least two first UL carriers, and randomValue represents the random value between 0 and 1 generated by the UE based on uniform distribution. A random number in the range of n3, n3 represents the n3+1th carrier of the at least two first UL carriers, represents the sum of weights corresponding to the first n3+1 first UL carriers among the at least two first UL carriers.

7. The method according to claim 2, characterized in that Determining a first UL carrier from the at least two first UL carriers based on the measured RSRP value, the preset RSRP threshold value, and the at least one parameter includes at least one of the following: The at least two first UL carriers include at least two normal uplink NUL carriers and one supplementary uplink SUL carrier, if the RSRP value is less than or equal to a preset first RSRP threshold value, the SUL carrier is used as the determined first UL carrier, if the RSRP value is greater than the first RSRP threshold value, a first UL carrier is determined from the at least two NUL carriers based on the at least one parameter; The at least two first UL carriers include at least two NUL carriers and at least two SUL carriers, if the RSRP value is less than or equal to a preset first RSRP threshold value, based on the at least one parameter, determining a first UL carrier from the at least two SUL carriers; if the RSRP value is greater than the second RSRP threshold value, based on the at least one parameter, determining a first UL carrier from the at least two NUL carriers; The at least two first UL carriers include at least one NUL carrier and at least two SUL carriers. If the RSRP value is less than or equal to a preset first RSRP threshold value, a first UL carrier is determined from the at least two SUL carriers based on the at least one parameter. If the RSRP value is greater than the third RSRP threshold value, the NUL carrier is used as the determined first UL carrier.

8. The method according to claim 1, characterized in that The UL carrier index is indicated by the base station through at least one of the following: The physical downlink shared channel PDSCH is used to schedule the transmission of paging messages and the downlink control information DCI carried by the physical downlink control channel PDCCH; The control element MAC CE of the media access control layer carried by the PDSCH used to transmit the paging message; Paging message.

9. The method according to any one of claims 1 to 8, characterized in that: The system information also includes configuration information related to physical uplink control channel PUCCH resources corresponding to at least two second UL carriers, and the method also includes: Determine a second UL carrier among the at least two second UL carriers; Based on the determined PUCCH resource corresponding to the second UL carrier, the PUCCH is sent on the determined second UL carrier.

10. The method according to claim 9, characterized in that Determining a second UL carrier from the at least two second UL carriers includes at least one of the following methods: Using a first UL carrier used for PRACH transmission as the determined second UL carrier; Determine a second UL carrier among the at least two second UL carriers based on a first UL carrier used for PRACH transmission and an association between the first UL carrier and the second UL carrier; Determine a second UL carrier among the at least two second UL carriers based on an association between the PRACH resources and the PUCCH resources; Using a second UL carrier with the smallest UL carrier index as the determined second UL carrier; Determining a second UL carrier from the at least two second UL carriers based on an indication of a random access response in a second step message of a four-step random access procedure, or based on an indication of scheduling downlink control information DCI in a fourth step message of a four-step random access procedure, or based on an indication of a successful random access response included in a second step message of a two-step random access procedure; Based on the ID of the UE, a second UL carrier is determined among the at least two second UL carriers.

11. The method according to claim 10, characterized in that Determining, based on the ID of the UE, a second UL carrier from the at least two second UL carriers, includes at least one of the following methods: performing a third modulo operation on the ID of the UE and the number of second UL carriers, and determining a second UL carrier from the at least two second UL carriers based on a result of the third modulo operation; A fourth modulo operation is performed on the sum of the ID of the UE and the weights of the at least two second UL carriers, and a second UL carrier is determined from among the at least two second UL carriers based on a result of the fourth modulo operation.

12. The method according to any one of claims 1 to 11, characterized in that: The system information further includes configuration information related to initial uplink bandwidth parts BWP corresponding to at least two third UL carriers, and the method further includes: Determine a third UL carrier among the at least two third UL carriers; Based on the determined initial uplink BWP corresponding to the third UL carrier, a PUSCH is sent on the determined third UL carrier.

13. The method according to claim 12, characterized in that Determining a third UL carrier from the at least two third UL carriers includes at least one of the following methods: If the configuration information related to the initial uplink BWP related to the determined first UL carrier is received, the determined first UL carrier is used as the determined third UL carrier; If no configuration information related to the initial uplink BWP related to the determined first UL carrier is received, use the UL carrier corresponding to the DL carrier transmitting the system message as the determined third UL carrier, or determine a third UL carrier from the at least two third UL carriers; Determine a third UL carrier from the at least two third UL carriers based on the UL carrier index number indicated in the random access response RAR; Based on the ID of the UE, a third UL carrier is determined among the at least two third UL carriers.

14. The method according to claim 13, characterized in that Determining, based on the ID of the UE, a third UL carrier from the at least two third UL carriers includes at least one of the following methods: performing a fifth modulo operation on the ID of the UE and the number of third UL carriers, and determining a third UL carrier from the at least two third UL carriers based on a result of the fifth modulo operation; A sixth modulo operation is performed on the sum of the ID of the UE and the weights of the at least two third UL carriers, and a third UL carrier is determined from the at least two third UL carriers based on a result of the sixth modulo operation.

15. The method according to any one of claims 1 to 14, characterized in that: The system information further includes configuration information related to initial downlink BWP corresponding to at least two first DL carriers, and the method further includes: determining a first DL carrier among the at least two first DL carriers; Based on the initial downlink BWP corresponding to the determined first DL carrier, a PDCCH and a PDSCH are received on the determined first DL carrier.

16. The method according to claim 15, characterized in that The receiving the PDCCH and the PDSCH on the determined first DL carrier based on the initial downlink BWP corresponding to the determined first DL carrier includes: Based on the initial downlink BWP corresponding to the determined first DL carrier, before establishing the RRC connected state, the PDCCH and the PDSCH are received on the determined first DL carrier.

17. The method according to claim 15, characterized in that Determining a first DL carrier from the at least two first DL carriers includes at least one of the following methods: Determine a first DL carrier among the at least two first DL carriers based on the determined first UL carrier and an association between the first UL carrier and the first DL carrier; Based on the ID of the UE, a first DL carrier is determined among the at least two first DL carriers.

18. The method according to claim 17, characterized in that Determining, based on the ID of the UE, a first DL carrier from the at least two first DL carriers includes at least one of the following methods: performing a seventh modulo operation on the ID of the UE and the number of first DL carriers, and determining a first DL carrier from the at least two first DL carriers based on a result of the seventh modulo operation; An eighth modulo operation is performed on the sum of the ID of the UE and the weights of the at least two first DL carriers, and based on the eighth modulo operation result, one first DL carrier is determined from the at least two first DL carriers.

19. The method according to any one of claims 1 to 18, characterized in that: The system information further includes configuration information related to a paging PDCCH search space for monitoring paging messages corresponding to at least two second DL carriers, and the method further includes: Determine, based on the ID of the UE, a second DL carrier among the at least two second DL carriers; Based on the determined paging PDCCH search space corresponding to the second DL carrier, a scheduling PDCCH for a paging message is monitored on the determined second DL carrier.

20. The method according to claim 19, characterized in that The determining, based on the ID of the UE, a second DL carrier from the at least two second DL carriers includes: Determine a paging opportunity index number based on the ID of the UE, perform a ninth modulo operation on the paging opportunity index number and the number of second DL carriers, and determine a second DL carrier from the at least two second DL carriers based on a result of the ninth modulo operation; Based on the ID of the UE, a paging opportunity index is determined, a modulo 10 operation is performed on the sum of the paging opportunity index and the weights of the at least two second DL carriers, and a second DL carrier is determined from the at least two second DL carriers based on a result of the modulo 10 operation.

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