Random access method and apparatus, and communication device, storage medium and program product

Abstract

Disclosed in the present application are a random access method and apparatus, and a communication device, a storage medium and a program product. The method comprises: a UE receiving a first message sent by a network side, wherein the first message comprises an SBFD sub-band configuration, and / or a random-access resource configuration on an SBFD symbol, and / or a random-access resource selection rule, and / or a random-access-type selection rule, and / or a random-access backoff indication.

Description

A random access method and apparatus, communication equipment, storage medium, and program product

[0001] Cross-referencing

[0002] This application claims priority to Chinese Patent Application No. 202510134273.3, filed on February 6, 2025, entitled "A Random Access Method and Apparatus, Communication Equipment, Storage Medium, and Program Product", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of wireless technology, and in particular to a random access method and apparatus, communication equipment, storage medium, and program product. Background Technology

[0004] In the existing New Radio (NR) random access procedure, it is supported for User Equipment (UE) to fall back from two-step random access (2-step RA) to four-step random access (4-step RA).

[0005] Regardless of whether it's two-step or four-step random access, random access resources can be configured on sub-band full-duplex (SBFD) symbols or on non-SBFD symbols. Different combinations of random access resource types (random access resources on SBFD symbols / random access resources on non-SBFD symbols) and different random access types (two-step random access / four-step random access) form various random access methods. In this case, a random access method that supports fallback between different access methods for the UE needs to be designed. Summary of the Invention

[0006] To address the aforementioned technical problems, embodiments of this application provide a random access method and apparatus, a communication device, a computer storage medium, and a computer program product.

[0007] The random access method provided in this application includes:

[0008] The UE receives a first message sent by the network side, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

[0009] The random access method provided in this application includes:

[0010] The network sends a first message to the UE, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access fallback indication.

[0011] The communication device provided in this application embodiment is applied to a UE, and the device includes:

[0012] The receiving unit is configured to receive a first message sent by the network side, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access fallback indication.

[0013] The communication device provided in this application embodiment is applied to a network device, and the device includes:

[0014] The transmitting unit is configured to send a first message to the UE, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

[0015] The communication device provided in this application includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute any of the above-described random access methods.

[0016] The non-volatile computer-readable storage medium provided in this application embodiment is configured to store a computer program that causes a computer to execute any of the above-described random access methods.

[0017] The computer program product provided in this application includes computer program instructions, which cause a computer to execute any of the above-described random access methods.

[0018] The technical solution of this application embodiment configures SBFD subband configuration, and / or random access resource configuration on SBFD symbols, and / or random access resource selection rules, and / or random access type selection rules, and / or random access fallback indication for the UE on the network side. This enables the UE to implement fallback of random access resources (i.e., fallback between random access resources on SBFD symbols and random access resources on non-SBFD symbols) and fallback of random access types (i.e., fallback between two-step random access and four-step random access), thereby enabling efficient access for the UE. Attached Figure Description

[0019] Figure 1 is a schematic diagram of an application scenario of an embodiment of this application;

[0020] Figure 2 is a flowchart illustrating the random access method provided in an embodiment of this application;

[0021] Figure 3 is a schematic flowchart of the random access method provided in the embodiments of this application;

[0022] Figure 4 is a schematic diagram of the structural composition of the communication device provided in an embodiment of this application;

[0023] Figure 5 is a schematic diagram of the structural composition of the communication device provided in an embodiment of this application;

[0024] Figure 6 is a schematic structural diagram of a communication device provided in an embodiment of this application;

[0025] Figure 7 is a schematic structural diagram of the chip according to an embodiment of this application. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] Figure 1 is a schematic diagram of an application scenario of an embodiment of this application.

[0028] As shown in Figure 1, the communication system may include a UE 110 and a network device 120. The network device 120 can communicate with the UE 110 via an air interface. Figure 1 exemplarily illustrates a base station and two UEs. In some embodiments, the wireless communication system may include multiple base stations, and the coverage area of ​​each base station may include other numbers of UEs. This application embodiment does not limit this.

[0029] It should be noted that Figure 1 is merely an example illustrating the system to which this application applies. Of course, the method shown in the embodiments of this application can also be applied to other systems. Furthermore, the term "and / or" in this document is simply a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. It should also be understood that "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, for example, B can be obtained through A; it can also mean that A indirectly instructs B, for example, A instructs C, B can be obtained through C; or it can mean that there is a relationship between A and B. It should also be understood that "correspondence" mentioned in the embodiments of this application can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship of instruction and being instructed, configuration and being configured, etc. It should also be understood that the "predefined" or "predefined rules" mentioned in the embodiments of this application can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including UE and network devices), and this application does not limit the specific implementation method. For example, predefined can refer to what is defined in a protocol. It should also be understood that in the embodiments of this application, the "protocol" can refer to a standard protocol in the field of communication.

[0030] In Time Division Duplex (TDD) systems, uplink and downlink time slots are allocated for communication within the same frequency band. To improve uplink coverage, reduce uplink latency, increase uplink system capacity, and enhance configuration flexibility, TDD considers introducing Side-Side Frequency Dividing (SBFD) technology. In SBFD, uplink subbands (UL subbands) can be configured on downlink symbols and / or flexible symbols; the resources corresponding to both uplink subbands and uplink symbols are considered uplink resources. Similarly, downlink subbands (DL subbands) can be configured on uplink symbols and / or flexible symbols; the resources corresponding to both downlink subbands and downlink symbols are considered downlink resources. UL subbands and DL subbands can be collectively referred to as SBFD subbands, or SBFD subbands include both UL and DL subbands. UL and DL subbands are different frequency domain resources allocated within a single TDD carrier. Symbols that contain SBFD subbands in the time domain are called SBFD symbols, and symbols that do not contain SBFD subbands are called non-SBFD symbols.

[0031] Within the uplink resources, random access resources can be configured for random access. Random access resources can also be called physical random access channel occasions (PRACH occasion) or random access channel occasions (RACH occasion), or simply RO.

[0032] Random access resources (ROs) configured on SBFD symbols are called additional random access resources (ROs); random access resources (ROs) configured on non-SBFD symbols are called legacy random access resources (ROs).

[0033] In the random access procedure, on the one hand, the UE can fall back between two-step random access and four-step random access, for example, falling back from two-step random access to four-step random access; on the other hand, the UE can fall back between random access resources on SBFD symbols and random access resources on non-SBFD symbols, for example, falling back from random access resources on SBFD symbols to random access resources on non-SBFD symbols. Therefore, a random access mechanism needs to be designed that can simultaneously support fallback between random access resources on SBFD symbols and random access resources on non-SBFD symbols, as well as fallback between two-step and four-step random access. To this end, the technical solution of the embodiments of this application is proposed. The technical solution of the embodiments of this application designs a random access method that flexibly supports fallback between random access resources on SBFD symbols and random access resources on non-SBFD symbols, as well as fallback between two-step and four-step random access, enabling efficient access for the UE.

[0034] It should be noted that the network side described in the embodiments of this application can also be replaced by a network device. In some embodiments, the network device is a base station.

[0035] It should be noted that, from the perspective of whether or not they support SBFD, the UEs described in this application embodiment are divided into two types: UEs that support SBFD and UEs that do not support SBFD. SBFD-aware UEs (abbreviated as SBFD UEs) can recognize random access resource configurations on SBFD symbols and random access resource configurations on non-SBFD symbols. When selecting a random access resource type, the available random access resource types include those on SBFD symbols and those on non-SBFD symbols. UEs that do not support SBFD can only recognize random access resource configurations on non-SBFD symbols, and when selecting a random access resource type, the available random access resource types are only those on non-SBFD symbols.

[0036] SBFD UEs can fall back between random access resources on SBFD symbols and random access resources on non-SBFD symbols, for example, falling back from random access resources on SBFD symbols to random access resources on non-SBFD symbols (it is even possible to fall back from random access resources on non-SBFD symbols to random access resources on SBFD symbols; the technical solutions of this application embodiment do not describe the fallback from random access resources on non-SBFD symbols to random access resources on SBFD symbols in detail, but it is easy to understand that this fallback method can also reuse the technical solutions of this application embodiment); in addition, SBFD UEs can fall back between two-step random access and four-step random access, for example, falling back from two-step random access to four-step random access (it is even possible to fall back from four-step random access to two-step random access; the technical solutions of this application embodiment do not describe the fallback from four-step random access to two-step random access in detail, but it is easy to understand that this fallback method can also reuse the technical solutions of this application embodiment).

[0037] It should be noted that the random access methods described in the embodiments of this application include random access resources and random access types, and different random access methods correspond to different random access resources and / or random access types. Specifically, random access resource types include random access resources on SBFD symbols, and / or random access resources on non-SBFD symbols; random access types include two-step random access, and / or four-step random access. Based on this, random access methods include a first random access method, and / or a second random access method, and / or a third random access method, and / or a fourth random access method. The first random access method refers to a four-step random access using random access resources on non-SBFD symbols, which can be called legacy 4-step RA for ease of description; the second random access method refers to a two-step random access using random access resources on non-SBFD symbols, which can be called legacy 2-step RA for ease of description; the third random access method refers to a four-step random access using random access resources on SBFD symbols, which can be called additional 4-step RA for ease of description; and the fourth random access method refers to a two-step random access using random access resources on SBFD symbols, which can be called additional 2-step RA for ease of description.

[0038] Figure 2 is a flowchart illustrating the random access method provided in this embodiment of the application. As shown in Figure 2, from the perspective of the UE, the random access method includes the following operations:

[0039] Operation 201: The UE receives a first message sent by the network side. The first message includes SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

[0040] In this embodiment, the random access resource selection rule indicates to the UE which random access resource (random access resource on SBFD symbols / random access resource on non-SBFD symbols) should be selected under what conditions. The random access type selection rule indicates to the UE which random access type (two-step random access / four-step random access) should be selected under what conditions. For example, regarding the selection of random access resources, when the network side configures the random access resource on SBFD symbols as short format, the network side may instruct UEs with a signal quality value (such as the downlink reference signal receiving power (RSRP) value) greater than a certain threshold to select the random access resource on SBFD symbols to increase PRACH capacity. Alternatively, when the network side configures the random access resource on SBFD symbols as long format, the network side may instruct UEs with a signal quality value (such as the downlink RSRP value) less than a certain threshold to select the random access resource on SBFD symbols to improve network coverage. Alternatively, the network side may instruct the UE to select the random access resource type closest to the time when the random access event was triggered to reduce random access latency. When selecting a random access method, considering that the initial random access method chosen by the UE will affect the direction of potential random access fallback, the selection process of the initial random access method should take into account the potential fallback of the random access method.

[0041] In some implementations, the random access resource selection rule includes a first condition, a second condition, and a probability corresponding to the second condition for the UE to select a random access resource type. The random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are defined by the protocol or indicated by the network side. In some implementations, where the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are indicated by the network side, the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are indicated in the random access resource selection rule. The first condition indicates under what conditions the UE selects which random access resource; the second condition is a further relaxation of the first condition, allowing a UE that does not meet the first condition but meets the second condition to continue selecting the random access resource corresponding to the first condition with a certain probability based on the probability corresponding to the second condition. Specific embodiments can be found in the following description.

[0042] In some implementations, the random access type selection rule includes a third condition, a fourth condition, and a probability corresponding to the fourth condition for the UE to select a random access type. The random access types corresponding to the third and fourth conditions are defined by the protocol or indicated by the network side. In some implementations, where the random access types corresponding to the third and fourth conditions are indicated by the network side, they are specified in the random access type selection rule. The third condition indicates under what conditions the UE selects which random access type; the fourth condition is a further relaxation of the third condition, allowing a UE that does not meet the third condition but meets the fourth condition to continue selecting the random access type corresponding to the third condition with a certain probability based on the probability corresponding to the fourth condition. Specific embodiments can be found in the following description.

[0043] In some implementations, the random access backoff indication includes the maximum number of preamble transmissions and / or the random access backoff direction. The maximum number of preamble transmissions indicates to the UE the conditions under which random access backoff is required.

[0044] Regarding the direction of random access backoff, the random access methods to be considered include the following: legacy 4-step RA, legacy 2-step RA, additional 4-step RA, and additional 2-step RA. Based on these four random access methods, all possible scenarios and directions for instructing the UE to backoff are as follows:

[0045] 1) For the case of rolling back once, the possible rollback directions are as follows:

[0046] legacy 2-step RA legacy 4-step RA;

[0047] Additional 2-step RA legacy 2-step RA;

[0048] Additional 2-step RA legacy 4-step RA;

[0049] Additional 4-step RA Legacy 4-step RA.

[0050] It should be noted that, considering there are two RACH configuration methods—Option 1 (additional RO reuses the existing RACH configuration except for power-related parameters) and Option 2 (additional RACH configuration is used for additional RO)—to support additional 2-step RACH configurations, [further details are needed]. Legacy 2-step RA, or additional 4-step RA The fallback procedure for legacy 4-step RA, regardless of whether RACH configuration Option 1 or Option 2 is used, requires configuring different maximum number of preamble transmissions (i.e., preambleTransMax values) for random access on SBFD symbols (additional 2-step RA, additional 4-step RA) and random access on non-SBFD symbols (legacy 2-step RA, legacy 4-step RA).

[0051] 2) For the case of rolling back twice, the possible rollback directions are as follows:

[0052] Additional 2-step RA legacy 2-step RA legacy 4-step RA;

[0053] Additional 2-step RA Additional 4-step RA Legacy 4-step RA.

[0054] It should be noted that the fallback directions given above only illustrate the case of falling back from the additional RA to the legacy RA. It is easy to understand that allowing the legacy RA to fall back to the additional RA is merely an extension of the possible fallback directions, and the technical solutions of the embodiments in this application also apply.

[0055] To address the above fallback scenarios, for random access fallback conditions, the network side needs to indicate the maximum number of preamble transmissions allowed for the UE in legacy 4-step RA, and / or legacy 2-step RA, and / or additional 4-step RA, and / or additional 2-step RA. In some implementations, different maximum preamble transmission counts are configured for different random access methods. Specifically, during the random access procedure of the current random access method, if the preamble transmission count (PREAMBLE_TRANSMISSION_COUNTER) is equal to the maximum number of preamble transmissions corresponding to the current random access method plus 1 (i.e., preambleTransMax+1), then the UE determines that random access fallback is required.

[0056] For random access backoff, the network side can indicate the direction through explicit first information or implicitly through preambles of different random access methods (in the case of implicit indication, additional indications may also be required, such as threshold indications). That is, random access backoff is indicated through first information or through preambles of different random access methods. In some implementations, the first information is an index.

[0057] It should be noted that when the network implicitly indicates the random access backoff direction by configuring the maximum number of preamble transmissions for different random access methods, the indicated backoff direction may be ambiguous or the UE may be allowed to select the backoff direction based on certain conditions (examples of ambiguous backoff directions are shown in Example 2b below; examples of allowing the UE to select the backoff direction based on certain conditions are shown in Example 2c below). In both of these cases, additional backoff conditions (such as threshold / priority indication, etc.) may need to be configured to allow the UE to determine the backoff direction.

[0058] In some implementations, when the random access backoff direction is indicated by the first information, the UE determines the random access backoff direction based on the first information indicated by the network side.

[0059] In some implementations, when the random access backoff direction is indicated by the maximum number of preamble transmissions for different random access methods, the UE determines the random access backoff direction based on the maximum number of preamble transmissions for different random access methods; alternatively, the UE determines the random access backoff direction based on the maximum number of preamble transmissions for different random access methods and the backoff conditions. In some implementations, the backoff conditions are configured in the first message.

[0060] Here are some examples of indicators for the direction of reversal.

[0061] Example 1: For cases where the network side explicitly indicates the rollback direction using first information, an example indexing the first information is provided below. A possible implementation of the index table is shown below:

[0062] Table 1 Index indicates the direction of rollback

[0063] Example 2a: For cases where the network side implicitly indicates the backoff direction by configuring the maximum number of preamble transmissions for different random access methods, a possible implementation is shown below:

[0064] The network configures the preambleTransMax to be 5 for the additional 2-step RA, 10 for the legacy 2-step RA, and 20 for the legacy 4-step RA via RRC (Radio Resource Control) signaling. Therefore, the fallback direction for a UE initially selecting the additional 2-step RA is: additional 2-step RA. legacy 2-step RA Legacy 4-step RA means that the rollback direction is consistent with the direction of preambleTransMax from smallest to largest.

[0065] Example 2b: For cases where the network side implicitly indicates the backoff direction by transmitting the maximum number of preambles through different random access methods, another possible implementation is shown below:

[0066] The network configures preambleTransMax=5 for additional 2-step RA, preambleTransMax=20 for additional 4-step RA, and preambleTransMax=20 for legacy 4-step RA via RRC signaling. Therefore, a UE initially selecting additional 2-step RA needs to further select the backoff direction based on backoff conditions (such as a backoff threshold): additional 2-step RA. Additional 4-step RA, or additional 2-step RA? Legacy 4-step RA. The fallback threshold may be an RSRP threshold, a CLI-RSSI (Cross-Link Interference-Received Signal Strength Indicator) threshold, etc., and the fallback threshold can be configured in the first message. If the fallback threshold is configured on the network side, the UE that initially selected additional 2-step RA determines whether to fall back to additional 4-step RA or legacy 4-step RA based on the fallback threshold (for example, UEs with measured RSRP greater than the RSRP threshold / CLI-RSSI less than the CLI-RSSI threshold fall back to additional 4-step RA; otherwise, they fall back to legacy 4-step RA).

[0067] Example 2c: For cases where the network implicitly indicates the backoff direction by transmitting the maximum number of preambles through different random access methods, another possible example is shown below:

[0068] If the network is configured via RRC signaling to set preambleTransMax=5 for additional 2-step RA, preambleTransMax=10 for additional 4-step RA, and preambleTransMax=20 for legacy 4-step RA, then the default fallback direction is: additional 2-step RA. Additional 4-step RA Legacy 4-step RA. However, considering that both additional 2-step RA and additional 4-step RA may experience significant cross-link interference (CLI) because their random access resources are located on SBFD symbols, it is advisable to consider allowing UEs initially selected for additional 2-step RA to directly fall back to legacy 4-step RA based on certain fallback conditions. These fallback conditions may be based on measurements such as the UE's CLI-RSSI and SRS-RSRP. For example, if a UE initially selected for additional 2-step RA determines that fallback is necessary and that CLI-RSSI and SRS-RSRP meet a certain condition, it can directly fall back to legacy 4-step RA.

[0069] In some implementations, the UE can select random access resources and random access type in any of the following ways:

[0070] Method 1: The UE first selects the random access resource type based on the random access resource selection rules, and then selects the random access type based on the random access type selection rules; or,

[0071] Method 2: The UE first selects a random access type based on the random access type selection rules, and then selects a random access resource type based on the random access resource selection rules; or,

[0072] Method 3: The UE first selects a random access resource type, and then selects a random access type based on the random access type selection rules; or,

[0073] Method 4: The UE first selects a random access type, and then selects a random access resource type based on the random access resource selection rules; or,

[0074] Method 5: The UE first selects the random access resource type based on the random access resource selection rules, and then selects the random access type; or,

[0075] Method 6: The UE first selects the random access type based on the random access type selection rules, and then selects the random access resource type; or,

[0076] Method 7: The UE first selects the random access resource type, then selects the random access type; or,

[0077] Method 8: The UE first selects the random access type, and then selects the random access resource type;

[0078] Random access resource types are divided into random access resources on SBFD symbols and random access resources on non-SBFD symbols; random access types are divided into two-step random access and four-step random access.

[0079] In some implementations, for the above-mentioned methods one, two, four, and five, the first condition in the random access resource selection rule corresponds to a first signal quality threshold, the second condition corresponds to a second signal quality threshold, and the probability corresponding to the second condition is the first probability;

[0080] The step of selecting the random access resource type based on the random access resource selection rule includes:

[0081] If the UE's signal quality is greater than the first signal quality threshold, then the random access resource type corresponding to the first condition is selected;

[0082] If the UE's signal quality is less than or equal to the first signal quality threshold and greater than the second signal quality threshold, then the random access resource type corresponding to the first condition is selected with a first probability, and the random access resource type corresponding to the second condition is selected with a second probability; wherein, the second probability is equal to 1 minus the first probability;

[0083] If the UE's signal quality is less than or equal to the second signal quality threshold, then the random access resource type corresponding to the second condition is selected.

[0084] In some implementations, the second signal quality threshold is equal to the first signal quality threshold minus the first relaxation change.

[0085] In some implementations, the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on an SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on a non-SBFD symbol. Alternatively, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on a non-SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on an SBFD symbol.

[0086] In some implementations, for the above-mentioned methods one, two, three, and six, the third condition in the random access type selection rule corresponds to the third signal quality threshold, the fourth condition corresponds to the fourth signal quality threshold, and the probability corresponding to the fourth condition is the third probability;

[0087] The step of selecting a random access type based on the random access type selection rule includes:

[0088] If the UE's signal quality is greater than the third signal quality threshold, then the random access type corresponding to the third condition is selected;

[0089] If the UE's signal quality is less than or equal to the third signal quality threshold and greater than the fourth signal quality threshold, then the random access type corresponding to the third condition is selected with the third probability, and the random access type corresponding to the fourth condition is selected with the fourth probability; where the fourth probability is equal to 1 minus the third probability.

[0090] If the UE's signal quality is less than or equal to the fourth signal quality threshold, then the random access type corresponding to the fourth condition is selected.

[0091] In some implementations, the fourth signal quality threshold is equal to the third signal quality threshold minus the second relaxation change.

[0092] In some implementations, the random access type corresponding to the third condition and the random access type corresponding to the fourth condition are defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is two-step random access, and the random access type corresponding to the fourth condition is four-step random access. Alternatively, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is four-step random access, and the random access type corresponding to the fourth condition is two-step random access.

[0093] The following are examples of several random access resources and random access type selections.

[0094] Example 3a (corresponding to method four above):

[0095] The initial random access method selection process for UEs includes the following steps: ① Select SUL / NUL ②BWP operation ③ Select random access resource set ④ Select random access type ⑤ Select random access resources.

[0096] In step ④, the UE selects either two-step random access or four-step random access as the random access resource type.

[0097] In step ⑤, if the random access type selected in the previous step corresponds to more than one random access resource, the UE selects the random access resource associated with the selected random access type based on the random access resource selection rules. The network side can configure the first condition in the random access resource selection rules to correspond to RSRP_1 (i.e., the first signal quality threshold), and the second condition to correspond to RSRP_2 (i.e., the second signal quality threshold), with a probability of p1 (i.e., the first probability). RSRP_2 = RSRP_1 - ΔRSRP_1, where ΔRSRP_1 is the first relaxation change. Based on this, the UE selects the random access resource as follows:

[0098] For UEs with RSRP > RSRR_1, the random access resource type corresponding to the first condition is selected.

[0099] For UEs with RSRP_1≥RSRP>RSRP_1-ΔRSRP_1, the random access resource type corresponding to the first condition is selected with probability p1, and the random access resource type corresponding to the second condition is selected with probability 1-p1 (i.e., the second probability).

[0100] For UEs whose RSRP ≤ RSRP_1 - ΔRSRP_1, the random access resource type corresponding to the second condition is selected.

[0101] The random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition can be defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on an SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on a non-SBFD symbol. Alternatively, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on a non-SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on an SBFD symbol.

[0102] In the above scheme, the first condition can also be understood as the absolute condition for the UE to select the random access resource type, and the second condition can also be understood as the relaxed condition for the UE to select the random access resource type.

[0103] Example 3b (corresponding to method three above):

[0104] The initial random access mode selection process for a UE includes the following steps: ① Select Supplementary Uplink (SUL) / Normal Uplink (NUL) ②Band Width Part (BWP) Operation ③ Select random access resource set ④ Select random access resource type ⑤ Select the random access type.

[0105] In step 4, if the random access resource set selected in the previous step includes more than one type of random access resource, the UE selects the random access resource type as random access resource on SBFD symbol or random access resource on non-SBFD symbol.

[0106] In step ⑤, if the random access resource type selected in the previous step corresponds to more than one random access type, the UE selects the random access type associated with the selected random access resource type based on the random access type selection rule. Here, the network side can configure the third condition in the random access type selection rule to correspond to RSRP_3 (i.e., the third signal quality threshold), and the fourth condition to correspond to RSRP_4 (i.e., the fourth signal quality threshold), with a probability of p2 (i.e., the third probability). RSRP_4 = RSRP_3 - ΔRSRP_2, where ΔRSRP_2 is the second relaxation change. Based on this, the UE selects the random access type as follows:

[0107] For UEs with RSRP > RSRR_3, the random access type corresponding to the third condition is selected.

[0108] For UEs with RSRP_3≥RSRP>RSRP_3-ΔRSRP_2, the random access type corresponding to the third condition is selected with probability p2, and the random access type corresponding to the fourth condition is selected with probability 1-p2 (i.e., the fourth probability).

[0109] For UEs whose RSRP ≤ RSRP_3 - ΔRSRP_2, the fourth condition corresponds to the random access type.

[0110] The random access types corresponding to the third and fourth conditions can be defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is two-step random access, and the random access type corresponding to the fourth condition is four-step random access. Alternatively, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is four-step random access, and the random access type corresponding to the fourth condition is two-step random access.

[0111] In the above scheme, the third condition can also be understood as an absolute condition for the UE to select a random access type, and the fourth condition can also be understood as a relaxed condition for the UE to select a random access type.

[0112] Example 3c (corresponding to Method 1 above):

[0113] The initial random access method selection process for UEs includes the following steps: ① Select SUL / NUL ②BWP operation ③ Select random access resource set ④ Select random access resource type ⑤ Select the random access type.

[0114] In step ④, the UE selects a random access resource based on the random access resource selection rules. The network side can configure the first condition in the random access resource selection rules to correspond to RSRP_1 (i.e., the first signal quality threshold), and the second condition to correspond to RSRP_2 (i.e., the second signal quality threshold). The probability corresponding to the second condition is p1 (i.e., the first probability). Here, RSRP_2 = RSRP_1 - ΔRSRP_1, where ΔRSRP_1 is the first relaxation change. Based on this, the UE selects the random access resource as follows:

[0115] For UEs with RSRP > RSRR_1, the random access resource type corresponding to the first condition is selected.

[0116] For UEs with RSRP_1≥RSRP>RSRP_1-ΔRSRP_1, the random access resource type corresponding to the first condition is selected with probability p1, and the random access resource type corresponding to the second condition is selected with probability 1-p1 (i.e., the second probability).

[0117] For UEs whose RSRP ≤ RSRP_1 - ΔRSRP_1, the random access resource type corresponding to the second condition is selected.

[0118] The random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition can be defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on an SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on a non-SBFD symbol. Alternatively, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on a non-SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on an SBFD symbol.

[0119] In the above scheme, the first condition can also be understood as the absolute condition for the UE to select the random access resource type, and the second condition can also be understood as the relaxed condition for the UE to select the random access resource type.

[0120] In step ⑤, the UE selects the random access type associated with the selected random access resource type based on the random access type selection rules. The network side can configure the third condition in the random access type selection rules to correspond to RSRP_3 (i.e., the third signal quality threshold), and the fourth condition to correspond to RSRP_4 (i.e., the fourth signal quality threshold), with a probability of p2 (i.e., the third probability). Here, RSRP_4 = RSRP_3 - ΔRSRP_2, where ΔRSRP_2 is the second relaxation change. Based on this, the UE selects the random access type as follows:

[0121] For UEs with RSRP > RSRR_3, the random access type corresponding to the third condition is selected.

[0122] For UEs with RSRP_3≥RSRP>RSRP_3-ΔRSRP_2, the random access type corresponding to the third condition is selected with probability p2, and the random access type corresponding to the fourth condition is selected with probability 1-p2 (i.e., the fourth probability).

[0123] For UEs whose RSRP ≤ RSRP_3 - ΔRSRP_2, the fourth condition corresponds to the random access type.

[0124] The random access types corresponding to the third and fourth conditions can be defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is two-step random access, and the random access type corresponding to the fourth condition is four-step random access. Alternatively, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is four-step random access, and the random access type corresponding to the fourth condition is two-step random access.

[0125] In the above scheme, the third condition can also be understood as an absolute condition for the UE to select a random access type, and the fourth condition can also be understood as a relaxed condition for the UE to select a random access type.

[0126] Example 3d (corresponding to Method 2 above):

[0127] The initial random access method selection process for UEs includes the following steps: ① Select SUL / NUL ②BWP operation ③ Select random access resource set ④ Select random access type ⑤ Select the random access resource type.

[0128] In step ④, the UE selects a random access type based on the random access type selection rules. The network side can configure the third condition in the random access type selection rules to correspond to RSRP_3 (i.e., the third signal quality threshold), and the fourth condition to correspond to RSRP_4 (i.e., the fourth signal quality threshold). The probability corresponding to the fourth condition is p2 (i.e., the third probability). Here, RSRP_4 = RSRP_3 - ΔRSRP_2, where ΔRSRP_2 is the second relaxation change. Based on this, the UE selects the random access type as follows:

[0129] For UEs with RSRP > RSRR_3, the random access type corresponding to the third condition is selected.

[0130] For UEs with RSRP_3≥RSRP>RSRP_3-ΔRSRP_2, the random access type corresponding to the third condition is selected with probability p2, and the random access type corresponding to the fourth condition is selected with probability 1-p2 (i.e., the fourth probability).

[0131] For UEs whose RSRP ≤ RSRP_3 - ΔRSRP_2, the fourth condition corresponds to the random access type.

[0132] The random access types corresponding to the third and fourth conditions can be defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is two-step random access, and the random access type corresponding to the fourth condition is four-step random access. Alternatively, the protocol may define or the network side may indicate that the random access type corresponding to the third condition is four-step random access, and the random access type corresponding to the fourth condition is two-step random access.

[0133] In the above scheme, the third condition can also be understood as an absolute condition for the UE to select a random access type, and the fourth condition can also be understood as a relaxed condition for the UE to select a random access type.

[0134] In step ⑤, the UE selects a random access resource associated with the selected random access type based on the random access resource selection rules. The network side can configure the first condition in the random access resource selection rules to correspond to RSRP_1 (i.e., the first signal quality threshold), and the second condition to correspond to RSRP_2 (i.e., the second signal quality threshold), with a probability of p1 (i.e., the first probability). Here, RSRP_2 = RSRP_1 - ΔRSRP_1, where ΔRSRP_1 is the first relaxation change. Based on this, the UE selects the random access resource as follows:

[0135] For UEs with RSRP > RSRR_1, the random access resource type corresponding to the first condition is selected.

[0136] For UEs with RSRP_1≥RSRP>RSRP_1-ΔRSRP_1, the random access resource type corresponding to the first condition is selected with probability p1, and the random access resource type corresponding to the second condition is selected with probability 1-p1 (i.e., the second probability).

[0137] For UEs whose RSRP ≤ RSRP_1 - ΔRSRP_1, the random access resource type corresponding to the second condition is selected.

[0138] The random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition can be defined by the protocol or indicated by the network side. For example, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on an SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on a non-SBFD symbol. Alternatively, the protocol may define or the network side may indicate that the random access resource type corresponding to the first condition is a random access resource on a non-SBFD symbol, and the random access resource type corresponding to the second condition is a random access resource on an SBFD symbol.

[0139] In the above scheme, the first condition can also be understood as the absolute condition for the UE to select the random access resource type, and the second condition can also be understood as the relaxed condition for the UE to select the random access resource type.

[0140] It should be noted that the above embodiments 3a to 3d only illustrate some embodiments, and more embodiments can be obtained based on the technical solutions of the embodiments of this application.

[0141] In some implementations, the random access method further includes the following operations:

[0142] The UE determines whether to back off from the current random access mode based on the random access backoff indication, and determines the random access preamble transmit power. In some embodiments, the UE determines whether the current random access mode in the current random access procedure meets the backoff conditions based on the random access backoff indication, and determines PREAMBLE_RECEIVED_TARGET_POWER, where PREAMBLE_RECEIVED_TARGET_POWER is the random access preamble transmit power, used by the UE to determine the preamble transmit power.

[0143] In some implementations, determining the random access preamble transmit power includes:

[0144] For the first back-up UE, the parameters upon which the UE determines the random access preamble transmit power include: target preamble receive power, a first power offset value, a power ramp-up value, and a second power offset value; and / or,

[0145] For the UE that backs up for the second time, the parameters on which the UE determines the random access preamble transmit power include: target preamble receive power, first power offset value, power ramp-up value, and third power offset value;

[0146] The power ramp value is determined based on the preamble power ramp count and the preamble power ramp step size.

[0147] In some implementations, the target preamble receive power is the target preamble receive power configured by the network side for the current random access method; and / or, the preamble power ramp step size is the power ramp step size configured by the network side for the current random access method.

[0148] In some embodiments, for a UE that is backing up for the first time, PREAMBLE_RECEIVED_TARGET_POWER is calculated by the following formula: PREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower_NOW+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER–1)×PREAMBLE_POWER_RAMPING_STEP_NOW+POWER_OFFSET_FALLBACK_1;

[0149] Wherein, `preambleReceivedTargetPower_NOW` represents the target preamble receive power configured by the network side for the current random access method; `DELTA_PREAMBLE` represents the power bias value based on the preamble format (i.e., the first power bias value), which can be defined by the protocol; `(PREAMBLE_POWER_RAMPING_COUNTER–1)×PREAMBLE_POWER_RAMPING_STEP_NOW` represents the power ramp-up value that should be performed assuming the target random access method is implemented (i.e., the access procedure is not a fallback from the current random access method to the target random access method); where PR EAMBLE_POWER_RAMPING_STEP_NOW indicates the power ramp-up step size configured by the network side for the current random access method; PREAMBLE_POWER_RAMPING_COUNTER is the value of PREAMBLE_POWER_RAMPING_COUNTER when PREAMBLE_TRANSMISSION_COUNTER = preambleTransMax + 1, where preambleTransMax indicates the maximum number of preamble transmissions for the current random access method; POWER_OFFSET_FALLBACK_1 indicates the second power offset value.

[0150] In some implementations, the second power bias value is calculated using the following formula:

[0151] (first parameter - 1) × (second parameter - third parameter);

[0152] The first parameter represents the preamble power ramp-up count value; the second parameter represents the power ramp-up step size corresponding to the random access method when the UE makes its initial random access attempt; and the third parameter represents the power ramp-up step size configured by the network side for the current random access method.

[0153] For example, if the first parameter is represented as PREMBLE_POWER_RAMPING_COUNTER, the second parameter as INITIAL_PREAMBLE_POWER_RAMPING_STEP, and the third parameter as PREMBLE_POWER_RAMPING_STEP_NOW, then the formula for calculating the second power bias value is as follows: (PREAMBLE_POWER_RAMPING_COUNTER–1)×(INITIAL_PREAMBLE_POWER_RAMPING_STEP–PREAMBLE_POWER_RAMPING_STEP_NOW);

[0154] In some embodiments, for a UE that rolls back for the second time, PREAMBLE_RECEIVED_TARGET_POWER is calculated by the following formula: PREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower_NOW+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER–1)×PREAMBLE_POWER_RAMPING_STEP_NOW+POWER_OFFSET_FALLBACK_2;

[0155] Wherein, `preambleReceivedTargetPower_NOW` represents the target preamble receive power configured by the network side for the current random access method; `DELTA_PREAMBLE` represents the power bias value based on the preamble format (i.e., the first power bias value), which can be defined by the protocol; `(PREAMBLE_POWER_RAMPING_COUNTER–1)×PREAMBLE_POWER_RAMPING_STEP_NOW` represents the power ramp-up value that should be performed assuming the target random access method is implemented (i.e., the access procedure is not a fallback from the current random access method to the target random access method); where PR EAMBLE_POWER_RAMPING_STEP_NOW indicates the power ramp-up step size configured by the network side for the current random access method; PREAMBLE_POWER_RAMPING_COUNTER is the value of PREAMBLE_POWER_RAMPING_COUNTER when PREAMBLE_TRANSMISSION_COUNTER = preambleTransMax + 1, where preambleTransMax indicates the maximum number of preamble transmissions for the current random access method; POWER_OFFSET_FALLBACK_2 indicates the third power offset value.

[0156] In some implementations, the third power bias value is calculated using the following formula:

[0157] (First parameter - Fourth parameter) × (Fifth parameter - Third parameter) + (Fourth parameter - 1) × (Second parameter - Third parameter);

[0158] Wherein, the first parameter represents the preamble power ramp-up count value, the fifth parameter represents the power ramp-up step size corresponding to the random access method to which the UE first falls back, the third parameter represents the power ramp-up step size configured by the network side for the current random access method, the second parameter represents the power ramp-up step size corresponding to the random access method when the UE initially attempts to access the system, and the fourth parameter is set to 1 when the UE meets the first fallback condition, and thereafter increases with the increase of the first parameter value until the UE meets the fallback condition again and stops increasing and remains unchanged. The increase with the increase of the first parameter value includes: if the value of the first parameter increases by 1, then the value of the fourth parameter increases by 1.

[0159] For example, if the first parameter is represented as PREMBLE_POWER_RAMPING_COUNTER, the second parameter as INITIAL_PREAMBLE_POWER_RAMPING_STEP, the third parameter as PREMBLE_POWER_RAMPING_STEP_NOW, the fourth parameter as COUNTER_1, and the fifth parameter as FIRST_FALLBACK_PREAMBLE_POWER_RAMPING_STEP, then the formula for calculating the third power bias value is as follows: (PREAMBLE_POWER_RAMPING_COUNTER–COUNTER_1)×(FIRST_FALLBACK_PREAMBLE_POWER_RAMPING_STEP–PREAMBLE_POWER_RAMPING_STEP_NOW)+(COUNTER_1–1)×(INITIAL_PREAMBLE_POWER_RAMPING_STEP–PREAMBLE_POWER_RAMPING_STEP_NOW).

[0160] It should be noted that the value of COUNTER_1 above reflects the number of preamble power ramping operations performed by the UE in the initial random access mode during a single random access session. It can also be obtained by recording the current value of PREAMBLE_POWER_RAMPING_COUNTER each time a rollback is determined, and then calculating the difference. For example, if the UE rolls back twice, it records PREAMBLE_POWER_RAMPING_COUNTER_1 for the first rollback condition met and PREAMBLE_POWER_RAMPING_COUNTER_2 for the second rollback condition met. Therefore, COUNTER_1 = (PREAMBLE_POWER_RAMPING_COUNTER_2 - PREAMBLE_POWER_RAMPING_COUNTER_1) + 1.

[0161] The technical solution of this application embodiment designs a fallback mechanism that can be compatible with fallback between random access resources on SBFD symbols and random access resources on non-SBFD symbols, as well as fallback between two-step random access and four-step random access, enabling efficient access for UEs.

[0162] Figure 3 is a second flowchart illustrating the random access method provided in an embodiment of this application. As shown in Figure 3, from a network perspective, the random access method includes the following operations:

[0163] Operation 301: The network sends a first message to the UE, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

[0164] In this embodiment, the random access resource selection rule indicates to the UE which random access resource (random access resource on SBFD symbol / random access resource on non-SBFD symbol) should be selected under what conditions. The random access type selection rule indicates to the UE which random access type (two-step random access / four-step random access) should be selected under what conditions. For example, regarding the selection of random access resources, when the network side configures the random access resource on the SBFD symbol as short format, the network side may instruct UEs with signal quality values ​​(such as RSRP values) greater than a certain threshold to select random access resources on the SBFD symbol to increase PRACH capacity. Alternatively, when the network side configures the random access resource on the SBFD symbol as long format, the network side may instruct UEs with signal quality values ​​(such as downstream RSRP values) less than a certain threshold to select random access resources on the SBFD symbol to improve network coverage. Alternatively, the network side may instruct the UE to select the random access resource type closest to the time when the random access event was triggered to reduce random access latency. Regarding the selection of random access type, considering that the initial random access type selection of the UE will affect the direction of its potential random access backoff, the selection process of the initial random access type of the UE should take into account the potential random access type backoff.

[0165] In some implementations, the random access resource selection rule includes a first condition, a second condition, and a probability corresponding to the second condition for the UE to select a random access resource type. The random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are defined by the protocol or indicated by the network side. In some implementations, where the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are indicated by the network side, the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are indicated in the random access resource selection rule. The first condition indicates under what conditions the UE selects which random access resource; the second condition is a further relaxation of the first condition, allowing a UE that does not meet the first condition but meets the second condition to continue selecting the random access resource corresponding to the first condition with a certain probability based on the probability corresponding to the second condition. Specific embodiments can be found in the following description.

[0166] In some implementations, the random access type selection rule includes a third condition, a fourth condition, and a probability corresponding to the fourth condition for the UE to select a random access type. The random access types corresponding to the third and fourth conditions are defined by the protocol or indicated by the network side. In some implementations, where the random access types corresponding to the third and fourth conditions are indicated by the network side, they are specified in the random access type selection rule. The third condition indicates under what conditions the UE selects which random access type; the fourth condition is a further relaxation of the third condition, allowing a UE that does not meet the third condition but meets the fourth condition to continue selecting the random access type corresponding to the third condition with a certain probability based on the probability corresponding to the fourth condition. Specific embodiments can be found in the following description.

[0167] In some implementations, the random access backoff indication includes the maximum number of preamble transmissions and / or the random access backoff direction. The maximum number of preamble transmissions indicates to the UE the conditions under which random access backoff is required.

[0168] In some implementations, different random access methods are configured with different maximum number of preamble transmissions, and the random access method includes random access resources and random access type.

[0169] In some implementations, the random access backoff direction is indicated by first information or by the maximum number of preamble transmissions for different random access methods, whereby the random access methods include random access resources and random access types.

[0170] It should be noted that the specific implementation of the above network-side solutions can also refer to the description of the UE-side solutions mentioned above.

[0171] Figure 4 is a schematic diagram of the structure of a communication device provided in an embodiment of this application, applied to a UE. As shown in Figure 4, the communication device includes:

[0172] The receiving unit 401 is configured to receive a first message sent by the network side. The first message includes SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

[0173] In some implementations, the random access resource selection rule includes a first condition, a second condition, and a probability corresponding to the second condition for the UE to select a random access resource type; wherein the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are defined by the protocol or indicated by the network side.

[0174] In some implementations, the random access type selection rule includes a third condition, a fourth condition, and a probability corresponding to the fourth condition for the UE to select a random access type; wherein the random access type corresponding to the third condition and the random access type corresponding to the fourth condition are defined by the protocol or indicated by the network side.

[0175] In some implementations, the random access backoff indication includes the maximum number of preamble transmissions and / or the random access backoff direction.

[0176] In some implementations, different random access methods are configured with different maximum number of preamble transmissions, and the random access method includes random access resources and random access type.

[0177] In some implementations, the random access backoff direction is indicated by first information or by the maximum number of preamble transmissions for different random access methods, wherein the random access method includes random access resources and random access type.

[0178] In some embodiments, the apparatus further includes a determining unit 402;

[0179] When the random access fallback direction is indicated by the maximum number of preamble transmissions for different random access methods, the determining unit 402 is configured to determine the random access fallback direction based on the maximum number of preamble transmissions for different random access methods; or, to determine the random access fallback direction based on the maximum number of preamble transmissions for different random access methods and the fallback conditions.

[0180] In some implementations, the fallback condition is configured in the first message.

[0181] In some embodiments, the device further includes a selection unit 403; the selection unit 403 is configured to:

[0182] First, select a random access resource type based on the random access resource selection rules, and then select a random access type based on the random access type selection rules; or,

[0183] First, select a random access type based on the random access type selection rules, and then select a random access resource type based on the random access resource selection rules; or,

[0184] First select a random access resource type, then select a random access type based on the random access type selection rules; or,

[0185] First select a random access type, then select a random access resource type based on the random access resource selection rules; or,

[0186] First, select the random access resource type based on the aforementioned random access resource selection rules, and then select the random access type; or,

[0187] First, select a random access type based on the aforementioned random access type selection rules, and then select a random access resource type; or,

[0188] First select the random access resource type, then select the random access type; or,

[0189] First select the random access type, then select the random access resource type;

[0190] The random access resource types are divided into random access resources on SBFD symbols and random access resources on non-SBFD symbols; the random access types are divided into two-step random access and four-step random access.

[0191] In some implementations, the first condition in the random access resource selection rule corresponds to a first signal quality threshold, the second condition corresponds to a second signal quality threshold, and the probability corresponding to the second condition is the first probability; the selection unit 403 is configured to select the random access resource type corresponding to the first condition if the signal quality of the UE is greater than the first signal quality threshold; if the signal quality of the UE is less than or equal to the first signal quality threshold and greater than the second signal quality threshold, select the random access resource type corresponding to the first condition with the first probability and select the random access resource type corresponding to the second condition with the second probability; wherein, the second probability is equal to 1 minus the first probability; if the signal quality of the UE is less than or equal to the second signal quality threshold, select the random access resource type corresponding to the second condition.

[0192] In some implementations, the third condition in the random access type selection rule corresponds to a third signal quality threshold, the fourth condition corresponds to a fourth signal quality threshold, and the probability corresponding to the fourth condition is a third probability. The selection unit 403 is configured to select the random access type corresponding to the third condition if the signal quality of the UE is greater than the third signal quality threshold; if the signal quality of the UE is less than or equal to the third signal quality threshold and greater than the fourth signal quality threshold, select the random access type corresponding to the third condition with the third probability and select the random access type corresponding to the fourth condition with the fourth probability; wherein, the fourth probability is equal to 1 minus the third probability; if the signal quality of the UE is less than or equal to the fourth signal quality threshold, select the random access type corresponding to the fourth condition.

[0193] In some implementations, the determining unit 402 is configured to determine to back off from the current random access mode based on the random access backoff indication, and to determine the random access preamble transmit power.

[0194] In some implementations, the determining unit 402 is configured to, for a UE that has undergone a first fallback, determine that the parameters on which the random access preamble transmit power is based include: target preamble receive power, a first power offset value, a power ramp value, and a second power offset value; and / or, for a UE that has undergone a second fallback, determine that the parameters on which the random access preamble transmit power is based include: target preamble receive power, a first power offset value, a power ramp value, and a third power offset value; wherein the power ramp value is determined based on the preamble power ramp count value and the preamble power ramp step size.

[0195] In some implementations, the target preamble receive power is the target preamble receive power configured by the network side for the current random access method; and / or, the preamble power ramp step size is the power ramp step size configured by the network side for the current random access method.

[0196] In some implementations, the second power bias value is calculated as follows: (first parameter - 1) × (second parameter - third parameter);

[0197] The first parameter represents the preamble power ramp-up count value; the second parameter represents the power ramp-up step size corresponding to the random access method when the UE makes its initial random access attempt; and the third parameter represents the power ramp-up step size configured by the network side for the current random access method.

[0198] In some implementations, the third power bias value is calculated as follows: (first parameter - fourth parameter) × (fifth parameter - third parameter) + (fourth parameter - 1) × (second parameter - third parameter);

[0199] Wherein, the first parameter represents the preamble power ramp-up count value, the fifth parameter represents the power ramp-up step size corresponding to the random access method to which the UE first falls back, the third parameter represents the power ramp-up step size configured by the network side for the current random access method, the second parameter represents the power ramp-up step size corresponding to the random access method when the UE initially attempts to access the system, and the fourth parameter is set to 1 when the UE meets the first fallback condition, and thereafter increases with the increase of the first parameter value until the UE meets the fallback condition again and stops increasing and remains unchanged. The increase with the increase of the first parameter value includes: if the value of the first parameter increases by 1, then the value of the fourth parameter increases by 1.

[0200] In some implementations, the random access resource type includes random access resources on SBFD symbols, and / or random access resources on non-SBFD symbols; the random access type includes: two-step random access, and / or four-step random access.

[0201] Those skilled in the art should understand that the functions of each unit in the communication device shown in Figure 4 can be understood with reference to the relevant description of the aforementioned method. The functions of each unit in the communication device shown in Figure 4 can be implemented by a program running on a processor, or by specific logic circuits.

[0202] Figure 5 is a schematic diagram of the structure of a communication device provided in an embodiment of this application, applied to a network device. As shown in Figure 5, the communication device includes:

[0203] The sending unit 501 is configured to send a first message to the UE, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

[0204] In some implementations, the random access resource selection rule includes a first condition, a second condition, and a probability corresponding to the second condition for the UE to select a random access resource type; wherein the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are defined by the protocol or indicated by the network side.

[0205] In some implementations, the random access type selection rule includes a third condition, a fourth condition, and a probability corresponding to the fourth condition for the UE to select a random access type; wherein the random access type corresponding to the third condition and the random access type corresponding to the fourth condition are defined by the protocol or indicated by the network side.

[0206] In some implementations, the random access backoff indication includes the maximum number of preamble transmissions and / or the random access backoff direction.

[0207] In some implementations, different random access methods are configured with different maximum number of preamble transmissions, and the random access method includes random access resources and random access type.

[0208] In some implementations, the random access backoff direction is indicated by first information or by the maximum number of preamble transmissions for different random access methods, wherein the random access method includes random access resources and random access type.

[0209] In some implementations, the random access resource type includes random access resources on SBFD symbols, and / or random access resources on non-SBFD symbols; the random access type includes: two-step random access, and / or four-step random access.

[0210] Those skilled in the art should understand that the functions of each unit in the communication device shown in Figure 5 can be understood with reference to the relevant description of the foregoing method. The functions of each unit in the communication device shown in Figure 5 can be implemented by a program running on a processor, or by specific logic circuits.

[0211] Figure 6 is a schematic structural diagram of a communication device 600 provided in an embodiment of this application. The communication device can be a UE or a network device. The communication device 600 shown in Figure 6 includes a processor 610, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0212] In some embodiments, as shown in FIG6, the communication device 600 may further include a memory 620. The processor 610 may retrieve and run computer programs from the memory 620 to implement the methods described in the embodiments of this application.

[0213] The memory 620 can be a separate device independent of the processor 610, or it can be integrated into the processor 610.

[0214] In some embodiments, as shown in FIG6, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. In some embodiments, it may send information or data to other devices or receive information or data sent by other devices.

[0215] The transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include antennas, and the number of antennas may be one or more.

[0216] In some embodiments, the communication device 600 may specifically be a network device in the embodiments of this application, and the communication device 600 may implement the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0217] In some embodiments, the communication device 600 may specifically be a UE in the embodiments of this application, and the communication device 600 may implement the corresponding processes implemented by the UE in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0218] Figure 7 is a schematic structural diagram of a chip according to an embodiment of this application. The chip 700 shown in Figure 7 includes a processor 710, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0219] In some embodiments, as shown in FIG7, chip 700 may further include memory 720. Processor 710 may retrieve and run computer programs from memory 720 to implement the methods described in this application embodiment.

[0220] The memory 720 can be a separate device independent of the processor 710, or it can be integrated into the processor 710.

[0221] In some embodiments, the chip 700 may further include an input interface 730. The processor 710 can control the input interface 730 to communicate with other devices or chips, and in some embodiments, can acquire information or data sent by other devices or chips.

[0222] In some embodiments, the chip 700 may further include an output interface 740. The processor 710 can control the output interface 740 to communicate with other devices or chips, and in some embodiments, can output information or data to other devices or chips.

[0223] In some embodiments, the chip can be applied to the network device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0224] In some embodiments, the chip can be applied to the UE in the embodiments of this application, and the chip can implement the corresponding processes implemented by the UE in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0225] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0226] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. During implementation, the operations of the above method embodiments can be completed by the integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, operations, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The operations of the methods disclosed in the embodiments of this application can be directly embodied in the execution by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor reads the information in the memory and combines it with its hardware to complete the operations of the above methods.

[0227] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0228] It should be understood that the above-described memory is exemplary and not a limiting description. For example, the memory in the embodiments of this application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DR RAM), etc. That is to say, the memory in the embodiments of this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0229] This application also provides a non-volatile computer-readable storage medium configured to store a computer program.

[0230] In some embodiments, the computer-readable storage medium may be applied to the network device in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, these will not be described in detail here.

[0231] In some embodiments, the computer-readable storage medium may be applied to the UE in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the UE in the various methods of the embodiments of this application. For the sake of brevity, these will not be described in detail here.

[0232] This application also provides a computer program product, including computer program instructions.

[0233] Optionally, the computer program product can be applied to the network device in the embodiments of this application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0234] In some embodiments, the computer program product can be applied to the UE in the embodiments of this application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the UE in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0235] Those skilled in the art will recognize that the unit and algorithm operations of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0236] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0237] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0238] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0239] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0240] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the operations of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0241] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A random access method, wherein, The method includes: The UE receives a first message sent by the network side, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

2. The method according to claim 1, wherein, The random access resource selection rule includes a first condition, a second condition, and the probability corresponding to the second condition for the UE to select a random access resource type; wherein, the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are defined by the protocol or indicated by the network side.

3. The method according to claim 1, wherein, The random access type selection rule includes a third condition, a fourth condition, and the probability corresponding to the fourth condition for the UE to select a random access type; wherein, the random access type corresponding to the third condition and the random access type corresponding to the fourth condition are defined by the protocol or indicated by the network side.

4. The method according to claim 1, wherein, The random access backoff indication includes the maximum number of preamble transmissions and / or the random access backoff direction.

5. The method according to claim 4, wherein, Different random access methods are configured with different maximum number of preamble transmissions, and the random access method includes random access resources and random access type.

6. The method according to claim 4, wherein, The random access fallback direction is indicated by the first information or by the maximum number of times the preamble is transmitted for different random access methods. The random access method includes random access resources and random access type.

7. The method according to claim 6, wherein, The method further includes the following: When the random access backoff direction is indicated by the maximum number of preamble transmissions for different random access methods, the method also includes: The UE determines the random access backoff direction based on the maximum number of preamble transmissions for different random access methods; or... The UE determines the random access backoff direction based on the maximum number of preamble transmissions and backoff conditions for different random access methods.

8. The method according to claim 7, wherein, The rollback conditions are configured in the first message.

9. The method according to claim 1, wherein, The method further includes: The UE first selects a random access resource type based on the random access resource selection rule, and then selects a random access type based on the random access type selection rule; or, The UE first selects a random access type based on the random access type selection rule, and then selects a random access resource type based on the random access resource selection rule; or, The UE first selects a random access resource type, and then selects a random access type based on the random access type selection rules; or, The UE first selects a random access type, and then selects a random access resource type based on the random access resource selection rules; or, The UE first selects a random access resource type based on the random access resource selection rules, and then selects a random access type; or, The UE first selects a random access type based on the random access type selection rules, and then selects a random access resource type; or, The UE first selects a random access resource type, and then selects a random access type; or, The UE first selects a random access type, and then selects a random access resource type; The random access resource types are divided into random access resources on SBFD symbols and random access resources on non-SBFD symbols; the random access types are divided into two-step random access and four-step random access.

10. The method according to claim 9, wherein, The first condition in the random access resource selection rule corresponds to a first signal quality threshold, the second condition corresponds to a second signal quality threshold, and the probability corresponding to the second condition is the first probability. The step of selecting the random access resource type based on the random access resource selection rule includes: If the signal quality of the UE is greater than the first signal quality threshold, then the random access resource type corresponding to the first condition is selected; If the signal quality of the UE is less than or equal to the first signal quality threshold and greater than the second signal quality threshold, then the random access resource type corresponding to the first condition is selected with the first probability, and the random access resource type corresponding to the second condition is selected with the second probability; wherein, the second probability is equal to 1 minus the first probability; If the signal quality of the UE is less than or equal to the second signal quality threshold, then the random access resource type corresponding to the second condition is selected.

11. The method according to claim 9, wherein, The third condition in the random access type selection rule corresponds to the third signal quality threshold, the fourth condition corresponds to the fourth signal quality threshold, and the probability corresponding to the fourth condition is the third probability. The step of selecting a random access type based on the random access type selection rule includes: If the signal quality of the UE is greater than the third signal quality threshold, then the random access type corresponding to the third condition is selected; If the signal quality of the UE is less than or equal to the third signal quality threshold and greater than the fourth signal quality threshold, then the random access type corresponding to the third condition is selected with the third probability, and the random access type corresponding to the fourth condition is selected with the fourth probability; wherein, the fourth probability is equal to 1 minus the third probability; If the signal quality of the UE is less than or equal to the fourth signal quality threshold, then the random access type corresponding to the fourth condition is selected.

12. The method according to claim 1, wherein, The method further includes: The UE determines to back off from the current random access mode based on the random access backoff indication, and determines the random access preamble transmit power.

13. The method according to claim 12, wherein, The determination of the random access preamble transmit power includes: For a UE performing a first fallback, the parameters upon which the UE determines the random access preamble transmit power include: target preamble receive power, a first power offset value, a power ramp-up value, and a second power offset value; and / or, For the UE that performs a second back-up, the parameters on which the UE determines the random access preamble transmit power include: target preamble receive power, first power offset value, power ramp-up value, and third power offset value; The power ramp value is determined based on the preamble power ramp count and the preamble power ramp step size.

14. The method according to claim 13, wherein, The target preamble receive power is the target preamble receive power configured by the network side for the current random access method; and / or, The preamble power ramp step size is the power ramp step size configured by the network side for the current random access method.

15. The method according to claim 13, wherein, The formula for calculating the second power bias value is as follows: (first parameter - 1) × (second parameter - third parameter); Wherein, the first parameter represents the preamble power ramp count value, the second parameter represents the power ramp step size corresponding to the random access method when the UE makes the initial random access attempt, and the third parameter represents the power ramp step size configured by the network side for the current random access method.

16. The method according to claim 13, wherein, The formula for calculating the third power bias value is as follows: (First parameter - Fourth parameter) × (Fifth parameter - Third parameter) + (Fourth parameter - 1) × (Second parameter - Third parameter); Wherein, the first parameter represents the preamble power ramp count value, the fifth parameter represents the power ramp step size corresponding to the random access method to which the UE first falls back, the third parameter represents the power ramp step size configured by the network side for the current random access method, the second parameter represents the power ramp step size corresponding to the random access method when the UE initially attempts to access the system, and the fourth parameter is set to 1 when the UE meets the first fallback condition, and thereafter increases with the increase of the first parameter value until the UE meets the fallback condition again and stops increasing and remains unchanged. The increase with the increase of the first parameter value includes: if the value of the first parameter increases by 1, then the value of the fourth parameter increases by 1.

17. The method according to any one of claims 1 to 16, wherein, The random access resource types include random access resources on SBFD symbols and / or random access resources on non-SBFD symbols; the random access types include: two-step random access and / or four-step random access.

18. A random access method, wherein, The method includes: The network sends a first message to the UE, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access fallback indication.

19. The method according to claim 18, wherein, The random access resource selection rule includes a first condition, a second condition, and the probability corresponding to the second condition for the UE to select a random access resource type; wherein, the random access resource type corresponding to the first condition and the random access resource type corresponding to the second condition are defined by the protocol or indicated by the network side.

20. The method according to claim 18, wherein, The random access type selection rule includes a third condition, a fourth condition, and the probability corresponding to the fourth condition for the UE to select a random access type; wherein, the random access type corresponding to the third condition and the random access type corresponding to the fourth condition are defined by the protocol or indicated by the network side.

21. The method according to claim 18, wherein, The random access backoff indication includes the maximum number of preamble transmissions and / or the random access backoff direction.

22. The method according to claim 21, wherein, Different random access methods are configured with different maximum number of preamble transmissions, and the random access method includes random access resources and random access type.

23. The method according to claim 21, wherein, The random access fallback direction is indicated by the first information or by the maximum number of times the preamble is transmitted for different random access methods. The random access method includes random access resources and random access type.

24. The method according to any one of claims 18 to 23, wherein, The random access resource types include random access resources on SBFD symbols and / or random access resources on non-SBFD symbols; the random access types include: two-step random access and / or four-step random access.

25. A communication device, wherein, Applied to a UE, the device includes: The receiving unit is configured to receive a first message sent by the network side, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access fallback indication.

26. A communication device, wherein, Applied to network devices, the device includes: The transmitting unit is configured to send a first message to the UE, the first message including SBFD subband configuration, and / or, random access resource configuration on SBFD symbols, and / or, random access resource selection rules, and / or, random access type selection rules, and / or, random access backoff indication.

27. A communication device, wherein, include: A processor and a memory, the memory being configured to store a computer program, the processor being configured to invoke and run the computer program stored in the memory to perform the method as described in any one of claims 1 to 24.

28. A non-volatile computer-readable storage medium, wherein, The computer is configured to store a computer program that causes the computer to perform the method as described in any one of claims 1 to 24.

29. A computer program product, wherein, It includes computer program instructions that cause a computer to perform the method as described in any one of claims 1 to 24.

Images