Random access method, apparatus, and communication system

Abstract

The embodiment of the present application provides a random access method, device and system, wherein the method comprises the following steps: a terminal device selects (or determines) a first downlink reference signal and / or a second downlink reference signal, the first downlink reference signal and the second downlink reference signal have a quasi-co-location (QCL) relationship; and the terminal device determines (or selects) a random access resource according to the first downlink reference signal and / or the second downlink reference signal.

Description

Technical Field

[0001] This application relates to the field of communications. Background Technology

[0002] In New Radio (NR) systems, for terminal devices, the Random Access (RA) process is as follows: Figure 1 As shown, the Media Access Control (MAC) sub-layer includes the following operations:

[0003] Operation 101: RA initiates;

[0004] Operation 102: Resource Selection;

[0005] Operation 103: Random access preamble transmission; and

[0006] Operation 104: Random Access Response (RAR) reception.

[0007] If the RAR is not successfully received, return to operation 102, select a resource, and resend the random access preamble on the selected resource (operation 103) to proceed with subsequent operations.

[0008] If the RAR is successfully received, and the random access is contention-based random access (CBRA), then proceed to operation 105 after the RAR is successfully received.

[0009] Operation 105: Contention resolution; if contention resolution is successful, the random access procedure is completed; if contention resolution is unsuccessful, return to Operation 102, select a resource, and resend the random access preamble on the selected resource (Operation 103) to proceed with subsequent operations.

[0010] If the RAR is successfully received, and the random access is a contention-free random access (CFRA), then the random access process is complete after the RAR is successfully received.

[0011] In operation 102, the MAC sublayer can select an SSB or CSI-RS resource based on the radio quality of the configured Synchronization Signal Block (SSB) and / or Channel State Information Reference Signal (CSI-RS) resources, the availability of corresponding dedicated resources and / or preambles, etc., or the MAC sublayer can arbitrarily select an SSB, thereby selecting and / or using the corresponding random access resources to transmit the corresponding random access preamble.

[0012] In operation 103, each time a random access preamble is transmitted, the MAC sublayer indicates the target receive power used for this transmission to the lower layer (e.g., the physical layer) so that the physical layer can calculate the corresponding transmission power of the random access preamble.

[0013] In the case of random access preamble retransmission, due to the power boosting mechanism, the target receive power indicated by the MAC sublayer to the lower layers can gradually increase. This allows uplink retransmissions (of the random access preamble) to be sent at a power equal to or slightly higher than the previous transmission (the previous transmission of the random access preamble), which is beneficial for successful reception on the network side and does not cause significant interference to other terminals. Currently, a power boosting-related counter is used to determine whether the current transmission has increased power compared to the previous transmission; such a counter is, for example, `PREAMBLE_POWER_RAMPING_COUNTER`.

[0014] In the current mechanism, for the retransmission of the random access preamble, from the perspective of resource selection, the power boost-related counter will only increment by 1 and the target received power indicated by the MAC sublayer to the lower layer will only increase when the selected SSB resource does not change. Otherwise, the counter remains unchanged.

[0015] Furthermore, when deciding whether to increment the power boost-related counter, the MAC sublayer also needs to consider a counter suspending indication. When this indication is present, the power boost-related counter remains unchanged. This indication is provided to the MAC sublayer by the physical layer. For example, ... Figure 1 As shown, if the terminal device changes the spatial domain transmission filter before performing random access preamble retransmission, the physical layer notifies the higher layer (MAC sublayer) to suspend the power boost related counters.

[0016] At the physical layer, such as Figure 1 As shown, the terminal device uses the "maximum power P configured by the network". CMAX,f,c (i) The smaller of the two values, “target received power and path loss”, is used to send the random access preamble, where the target received power is provided by the MAC sublayer and the path loss is obtained by subtracting the reference received power after filtering by the higher layers from the reference signal power provided by the system information (RSRP).

[0017] On the other hand, NR radion access operation in unlicensed spectrum (NR-U) can be performed within the serving cell. In an NR-U cell (simply referred to as an NR-U cell), network and terminal devices may employ a listen-before-tell (LBT) mechanism before transmission, meaning that transmission will only occur if the channel is detected to be idle. Furthermore, NR-U introduces new mechanisms to increase data transmission opportunities, thereby reducing the impact of LBT on data transmission.

[0018] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Summary of the Invention

[0019] The inventors discovered that in the selection of random access resources and the transmission of random access preamble during the random access process, a downlink reference signal (DRS, such as SSB, CSI-RS) is used as a reference to determine the time-frequency resources and transmission power for transmitting the random access preamble. This means that the selection of random access resources and the transmission of random access preamble are both related to the downlink reference signal.

[0020] On the other hand, to reduce the impact of LBT, NR-U supports more SSB locations. The 3GPP RAN1 working group agreed to support the following Q values ​​for SSB QCL (quasi-colocation) acquisition: {1, 2, 4, 8}. For a cell, serving cell, or neighboring cell, once the terminal device knows the Q value, it can assume a QCL relationship between synchronization signal or broadcast channel (SS / PBCH) blocks with the same Modulo(A,Q) value within or across the downlink reference signal (DRS) transmission or measurement window, where A is the PBCH DMRS (Physical Broadcast Channel Demodulation Reference Signal) sequence index.

[0021] Based on the above agreement, in NR-U, multiple SSBs may correspond to one SSB, meaning that multiple SSBs are quasi-cooperative localization. For example, ... Figure 2 As shown, assuming Q=4, then SSB index=0 and SSB index=4 are quasi-cooperative localizations; SSB index=2 and SSB index=6 are quasi-cooperative localizations.

[0022] However, the current random access process does not consider multiple SSBs with QCL relationships, which leads to the following problems.

[0023] Question 1: When selecting random access resources, if SSB1 is not transmitted due to LBT, and SSB2, which has a QCL relationship with SSB1, is transmitted through LBT, then SSB1 cannot meet the radio quality conditions. Even if the corresponding random access resources are configured, the terminal device may not select the random access resources corresponding to SSB1 for transmission. This means that even if the network provides more transmission opportunities to overcome LBT, the terminal device will not transmit on the additional transmission opportunities based on the existing mechanism.

[0024] Question 2: During random access preamble transmission, if the selected SSB resource changes, the transmission power remains unchanged based on the current mechanism. This means that even if the currently selected SSB has a QCL relationship with the previously selected SSB, the transmission power will not change. This renders the power ramping mechanism ineffective, thereby reducing the success rate of random access.

[0025] To address at least one of the above-mentioned problems or other similar problems, embodiments of this application provide a random access method, apparatus, and system.

[0026] According to one aspect of the embodiments of this application, a random access method is provided, wherein the method includes:

[0027] The terminal device selects (or determines) a first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship;

[0028] The terminal device determines (or selects) random access resources based on the first downlink reference signal and / or the second downlink reference signal.

[0029] According to one aspect of the embodiments of this application, a random access method is provided, wherein the method includes:

[0030] The terminal device selects (or determines) a first downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship;

[0031] The terminal device determines the next available PRACH opportunity from a series of consecutive PRACH opportunities. The series of consecutive PRACH opportunities refers to the PRACH opportunity corresponding to the first downlink reference signal, or the PRACH opportunity corresponding to the second downlink reference signal, or the intersection of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal, or the union of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal.

[0032] According to one aspect of the embodiments of this application, a random access method is provided, wherein the method includes:

[0033] If the selected (or determined) downlink reference signal has a QCL relationship with the downlink reference signal selected during the last random access preamble transmission, the terminal device increments the power boost correlation counter by 1.

[0034] According to one aspect of the embodiments of this application, a random access device is provided, configured in a terminal device, wherein the device includes:

[0035] The selection unit selects (or determines) a first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship;

[0036] The determining unit determines (or selects) random access resources based on the first downlink reference signal and / or the second downlink reference signal.

[0037] According to one aspect of the embodiments of this application, a random access device is provided, configured in a terminal device, wherein the device includes:

[0038] The selection unit selects (or determines) a first downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship;

[0039] The determining unit determines the next available PRACH opportunity from a series of consecutive PRACH opportunities, wherein the consecutive PRACH opportunities refer to the PRACH opportunity corresponding to the first downlink reference signal, or the PRACH opportunity corresponding to the second downlink reference signal, or the intersection of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal, or the union of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal.

[0040] According to one aspect of the embodiments of this application, a random access device is provided, configured in a terminal device, wherein the device includes:

[0041] If the selected (or determined) downlink reference signal has a QCL relationship with the downlink reference signal selected during the last random access preamble transmission, the processing unit increments the power boost correlation counter by 1.

[0042] According to one aspect of the embodiments of this application, a configuration method is provided, wherein the method includes:

[0043] The network device generates first configuration information and / or second configuration information and / or third configuration information;

[0044] The network device sends the first configuration information and / or the second configuration information and / or the third configuration information, wherein...

[0045] The first configuration information includes one or more of the following:

[0046] A first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a QCL relationship; and

[0047] Random access preamble index, wherein the random access preamble index is used by the first downlink reference signal or the second downlink reference signal to determine candidate beams;

[0048] The second configuration information includes one or more of the following:

[0049] Random access channel dedicated configuration information, which indicates the non-contentionable random access resources associated with the first downlink reference signal and / or the second downlink reference signal;

[0050] The identifier of the first downlink reference signal or the second downlink reference signal, wherein the first downlink reference signal or the second downlink reference signal is a reference signal transmitted by the serving cell, and, when the terminal device selects the first downlink reference signal and / or the second downlink reference signal, the random access preamble corresponding to the first downlink reference signal and / or the second downlink reference signal is available; and

[0051] Random access preamble index, wherein the random access preamble index corresponds to a random access preamble used by the first downlink reference signal or the second downlink reference signal to determine candidate beams.

[0052] The third configuration information includes one or more of the following:

[0053] The index of the random access preamble; and

[0054] Index of synchronization signal or broadcast channel.

[0055] According to one aspect of the embodiments of this application, a configuration apparatus is provided for configuring a network device, wherein the apparatus includes:

[0056] A generation unit that generates first configuration information and / or second configuration information and / or third configuration information;

[0057] The sending unit sends the first configuration information and / or the second configuration information and / or the third configuration information, wherein,

[0058] The first configuration information includes one or more of the following:

[0059] A first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a QCL relationship; and

[0060] Random access preamble index, wherein the random access preamble index is used by the first downlink reference signal or the second downlink reference signal to determine candidate beams;

[0061] The second configuration information includes one or more of the following:

[0062] Random access channel dedicated configuration information, which indicates the non-contentionable random access resources associated with the first downlink reference signal and / or the second downlink reference signal;

[0063] The identifier of the first downlink reference signal or the second downlink reference signal, wherein the first downlink reference signal or the second downlink reference signal is a reference signal transmitted by the serving cell, and, when the terminal device selects the first downlink reference signal and / or the second downlink reference signal, the random access preamble corresponding to the first downlink reference signal and / or the second downlink reference signal is available; and

[0064] Random access preamble index, wherein the random access preamble index corresponds to a random access preamble used by the first downlink reference signal or the second downlink reference signal to determine candidate beams.

[0065] The third configuration information includes one or more of the following:

[0066] The index of the random access preamble; and

[0067] Index of synchronization signal or broadcast channel.

[0068] According to one aspect of the embodiments of this application, a terminal device is provided, wherein the terminal device includes the aforementioned random access device.

[0069] According to one aspect of the embodiments of this application, a network device is provided, wherein the network device includes the aforementioned configuration means.

[0070] According to one aspect of the embodiments of this application, a communication system is provided, the communication system including the aforementioned network device and the aforementioned terminal device.

[0071] According to other aspects of embodiments of this application, a computer-readable program is provided, wherein when the program is executed in a terminal device, the program causes a computer to perform the aforementioned random access method in the terminal device.

[0072] According to other aspects of embodiments of this application, a storage medium storing a computer-readable program is provided, wherein the computer-readable program causes a computer to execute the aforementioned random access method in a terminal device.

[0073] According to other aspects of embodiments of this application, a computer-readable program is provided, wherein when the program is executed in a network device, the program causes a computer to perform the aforementioned configuration method in the network device.

[0074] According to other aspects of embodiments of this application, a storage medium storing a computer-readable program is provided, wherein the computer-readable program causes a computer to perform the aforementioned configuration method in a network device.

[0075] One of the beneficial effects of the embodiments of this application is that it improves the success rate of random access.

[0076] Specific embodiments of this application are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of this application can be adopted. It should be understood that the embodiments of this application are not limited in scope. Within the spirit and scope of the appended claims, embodiments of this application include many changes, modifications, and equivalents.

[0077] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0078] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0079] The elements and features described in one drawing or embodiment of this application may be combined with elements and features shown in one or more other drawings or embodiments. Furthermore, in the drawings, similar reference numerals denote corresponding parts in several drawings and can be used to indicate corresponding parts used in more than one embodiment.

[0080] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0081] Figure 1 This is a schematic diagram of the random access process;

[0082] Figure 2 This is a schematic diagram of SSB transmission in NR-U;

[0083] Figure 3 This is a schematic diagram of a communication system according to an embodiment of this application;

[0084] Figure 4 This is a schematic diagram of a random access method according to an embodiment of this application;

[0085] Figure 5 This is another schematic diagram of the random access method according to an embodiment of this application;

[0086] Figure 6 This is another schematic diagram of the random access method according to an embodiment of this application;

[0087] Figure 7 This is a schematic diagram of a configuration method according to an embodiment of this application;

[0088] Figure 8 This is a schematic diagram illustrating a portion of the beam failure recovery configuration information unit;

[0089] Figure 9 This is a schematic diagram illustrating a portion of the dedicated configuration information unit for random access channels;

[0090] Figure 10 This is a schematic diagram of a random access device according to an embodiment of this application;

[0091] Figure 11 This is another schematic diagram of a random access device according to an embodiment of this application;

[0092] Figure 12This is another schematic diagram of the random access device according to an embodiment of this application;

[0093] Figure 13 This is a schematic diagram of a configuration device according to an embodiment of this application;

[0094] Figure 14 This is a schematic diagram of a terminal device according to an embodiment of this application;

[0095] Figure 15 This is a schematic diagram of a network device according to an embodiment of this application. Detailed Implementation

[0096] Referring to the accompanying drawings, the foregoing and other features of this application will become apparent from the following description. Specific embodiments of this application are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this application may be employed. It should be understood that this application is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims.

[0097] In the embodiments of this application, the terms "first," "second," etc., are used to distinguish different elements by name, but do not indicate the spatial arrangement or chronological order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one or more of the terms listed in association and all combinations thereof. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0098] In the embodiments of this application, the singular forms "a," "the," etc., including the plural forms, should be broadly understood as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms, unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0099] In the embodiments of this application, the term "communication network" or "wireless communication network" may refer to a network that conforms to any of the following communication standards, such as Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0100] Furthermore, communication between devices in a communication system can be carried out according to communication protocols at any stage, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and future 5G, New Radio (NR), and / or other currently known or future communication protocols.

[0101] In the embodiments of this application, the term "network device" refers, for example, to a device in a communication system that connects a terminal device to a communication network and provides services to that terminal device. Network devices may include, but are not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

[0102] Base stations can include, but are not limited to: NodeBs (or NBs), evolved NodeBs (eNodeBs or eNBs), and 5G base stations (gNBs), etc. They can also include Remote Radio Heads (RRHs), Remote Radio Units (RRUs), relays, or low-power nodes (e.g., femto, pico, etc.). The term "base station" can include some or all of their functions, and each base station can provide communication coverage to a specific geographic area. The term "cell" can refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0103] In the embodiments of this application, the term "user equipment" (UE) refers to a device that accesses a communication network and receives network services through a network device, and can also be called "terminal equipment" (TE). Terminal equipment can be fixed or mobile, and can also be called mobile station (MS), terminal, user, subscriber station (SS), access terminal (AT), station, etc.

[0104] Terminal devices may include, but are not limited to, the following devices: cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptops, cordless phones, smartphones, smartwatches, digital cameras, etc.

[0105] For example, in scenarios such as the Internet of Things (IoT), terminal devices can also be machines or devices for monitoring or measurement, such as including but not limited to: machine-type communication (MTC) terminals, vehicle communication terminals, device-to-device (D2D) terminals, machine-to-machine (M2M) terminals, and so on.

[0106] The following examples illustrate the scenarios of the embodiments of this application, but the embodiments of this application are not limited thereto.

[0107] Figure 3 This is a schematic diagram of a communication system according to an embodiment of this application, illustrating the case of a terminal device and a network device as examples. Figure 3 As shown, the communication system 300 may include: a network device 301 and a terminal device 302. For simplicity, Figure 3 This explanation will use only one terminal device as an example. Network device 301 is, for example, the gNB network device in an NR system.

[0108] In this embodiment of the application, network device 301 and terminal device 302 can perform existing services or services that can be implemented in the future. For example, these services include, but are not limited to: enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.

[0109] Terminal device 302 can send data to network device 301, for example, using unlicensed transmission. Network device 301 can receive data sent by one or more terminal devices 302 and send feedback information to terminal devices 302, such as acknowledgment (ACK) or non-acknowledgment (NACK) information. Based on the feedback information, terminal device 302 can confirm the end of the transmission process, or can initiate new data transmission, or can retransmit the data.

[0110] Various embodiments of this application will now be described with reference to the accompanying drawings. These embodiments are merely exemplary and are not intended to limit the scope of this application.

[0111] First aspect of the embodiments

[0112] An embodiment of the first aspect of this application provides a random access method, which is applied to a terminal device, such as... Figure 3 The terminal device 302 shown.

[0113] Figure 4 This is a schematic diagram of a random access method according to an embodiment of this application. Please refer to it. Figure 4 The method includes:

[0114] Operation 401: The terminal device selects (or determines) a first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship;

[0115] Operation 402: The terminal device determines (or selects) random access resources based on the first downlink reference signal and / or the second downlink reference signal.

[0116] In this embodiment, the QCL relationship between the first downlink reference signal and the second downlink reference signal means that the value of modulo(A,Q) corresponding to the first downlink reference signal is the same as the value of modulo(A,Q) corresponding to the second downlink reference signal, where A is the sequence index of the physical broadcast channel downlink demodulation reference signal (PBCH DMRS) and Q is a parameter or setpoint configured by the network device.

[0117] The embodiments of this application consider multiple downlink reference signals with QCL relationships when selecting random access resources, thereby improving the success rate of random access.

[0118] In the embodiments of this application, the first downlink reference signal and the second downlink reference signal are, for example, SSB or CSI-RS, but this application is not limited thereto.

[0119] In the embodiments of this application, such as Figure 4 As shown, the method may further include:

[0120] Operation 403: The terminal device sets (or determines) a random access preamble based on the first downlink reference signal and / or the second downlink reference signal. This application does not restrict the execution order of operations 402 and 403. Figure 4 The illustration shows that operation 403 is performed before operation 402. In other embodiments, operation 403 may also be performed after operation 402.

[0121] In one embodiment, the first downlink reference signal and / or the second downlink reference signal are included in the downlink control information (DCI) sent by the network device. If the DCI indicates the index of the random access preamble and the index of the random access preamble is not 0b00000, then in operation 401, the terminal device selects the first downlink reference signal and / or the second downlink reference signal as a reference.

[0122] In this embodiment, the reference signals in the downlink control information have a QCL relationship. The first downlink reference signal and / or the second downlink reference signal are selected from the reference signals in the downlink control information, and there can be one or more of the first downlink reference signal and / or the second downlink reference signal. That is, if the DCI contains multiple downlink reference signals and these downlink reference signals have a QCL relationship, the terminal device can select one or more of them as a reference. The terminal device can choose arbitrarily or according to predetermined rules, and this application does not impose any restrictions.

[0123] In this embodiment, if the selected downlink reference signal (the first downlink reference signal and / or the second downlink reference signal) is included in the DCI, then in operation 403, the terminal device can set the index of the random access preamble (PREAMBLE_INDEX) to an index indicated (or explicitly provided) in the DCI; if the selected downlink reference signal (the first downlink reference signal and / or the second downlink reference signal) is not included in the DCI, then in operation 403, the terminal device can set the index of the random access preamble (PREAMBLE_INDEX) to an index corresponding to (or associated with) the selected downlink reference signal.

[0124] In another embodiment, if the first downlink reference signal and the second downlink reference signal satisfy at least one of the following conditions, the terminal device may select the first downlink reference signal as a reference, select the second downlink reference signal as a reference, or select both the first downlink reference signal and the second downlink reference signal as references simultaneously. These conditions include:

[0125] The RSRP of the first downlink reference signal is greater than the threshold;

[0126] The RSRP of the second downlink reference signal is greater than the threshold;

[0127] The first downlink reference signal is included in the candidate beam reference signal list (candidateBeamRSList) used to configure beam failure recovery;

[0128] The second downlink reference signal is included in the candidate beam reference signal list (candidateBeamRSList) used to configure beam failure recovery;

[0129] The first downlink reference signal is indicated (or provided) by the network device via downlink control information (DCI);

[0130] The second downlink reference signal is indicated (or provided) by the network equipment via downlink control information (DCI);

[0131] The non-contention-based random access resources associated with the first downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information (rach-ConfigDedicated);

[0132] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information (rach-ConfigDedicated);

[0133] The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used in a contention-based random access preamble selection process; and

[0134] The second downlink reference signal is either not configured with non-contention-based random access resources or is used in a contention-based random access preamble selection process.

[0135] In this embodiment, in at least one example, the selected downlink reference signal may be included in a candidate beam reference signal list for configuring beam failure (recovery), which will be described in later embodiments.

[0136] In this embodiment, in at least one example, the selected downlink reference signal may also be indicated or provided by downlink control information (DCI) provided by the network device, which will be described in later embodiments.

[0137] In this embodiment, in at least one example, the non-contentionable random access resource associated with the selected downlink reference signal can be explicitly provided by random access channel-specific configuration information (rach-ConfigDedicated), which will be described in later embodiments.

[0138] In this embodiment, in at least one example, the selected downlink reference signal is not configured with non-contentionable random access resources, or the selected downlink reference signal is used for a contention-based random access preamble selection process.

[0139] In this embodiment, in operation 403, the terminal device can select a random access preamble with equal probability from the random access preambles associated with the selected downlink reference signal, and set the index (PREAMBLE_INDEX) of the random access preamble to the index of the selected random access preamble. Alternatively, in operation 403, the terminal device can set the index (PREAMBLE_INDEX) of the random access preamble to a random access preamble index (ra-PreambleIndex) corresponding to (or associated with) the first downlink reference signal and / or the second downlink reference signal (i.e., the selected downlink reference signal and / or the downlink reference signal that has a QCL relationship with the selected downlink reference signal).

[0140] In another embodiment, if the RSRP of the first downlink reference signal is greater than a threshold, the terminal device selects the first downlink reference signal; if the RSRP of the second downlink reference signal is greater than the threshold, the terminal device selects the second downlink reference signal.

[0141] For example, if the first downlink reference signal satisfies at least one of the following conditions 1, the terminal device can select the first downlink reference signal; if the second downlink reference signal satisfies at least one of the following conditions 2, the terminal device can select the second downlink reference signal.

[0142] Condition 1 includes:

[0143] The first downlink reference signal is included in the candidate beam reference signal list (candidateBeamRSList) used to configure beam failure recovery;

[0144] The first downlink reference signal is indicated (or provided) by the network device via downlink control information (DCI);

[0145] The non-contention-based random access resources associated with the first downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information (rach-ConfigDedicated);

[0146] The first downlink reference signal is either not configured with non-contention-based random access resources or is used in a contention-based random access preamble selection process.

[0147] Condition 2 includes:

[0148] The second downlink reference signal is included in the candidate beam reference signal list (candidateBeamRSList) used to configure beam failure recovery;

[0149] The second downlink reference signal is indicated (or provided) by the network device through downlink control information (DCI);

[0150] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information (rach-ConfigDedicated);

[0151] The second downlink reference signal is either not configured with non-contention-based random access resources or is used in a contention-based random access preamble selection process.

[0152] In yet another embodiment, if the random access resource associated with the first downlink reference signal is configured, the terminal device selects the first downlink reference signal; if the random access resource associated with the second downlink reference signal is configured, the terminal device selects the second downlink reference signal.

[0153] For example, if the random access resources satisfy at least one of the following conditions 3, the terminal device selects the first downlink reference signal; if the random access resources satisfy at least one of the following conditions 4, the terminal device selects the second downlink reference signal.

[0154] Condition 3 includes:

[0155] The random access resources associated with the first downlink reference signal are non-contentionable random access resources;

[0156] The random access resource associated with the first downlink reference signal is the resource requested by the system information (SI);

[0157] Condition 4 includes:

[0158] The random access resources associated with the second downlink reference signal are non-contentionable random access resources;

[0159] The random access resources associated with the second downlink reference signal are the resources requested by the system information (SI) request.

[0160] In this example, non-contentionable random access resources are resources that can be requested for beam failure recovery, and non-contentionable random access resources can be provided by network devices via RRC signaling.

[0161] Alternatively, in this example, non-contentionable random access resources can be indicated (or notified) by the network device via downlink control information (DCI).

[0162] Alternatively, in this example, the random access procedure is initiated in response to a system information request, and the resources requested for the system information are indicated (or explicitly provided) by the network device via RRC signaling.

[0163] In yet another embodiment, if the random access resources corresponding to (or associated with) the first downlink reference signal or the second downlink reference signal are configured, then in operation 401, the terminal device may select the first downlink reference signal as a reference, or select the second downlink reference signal as a reference, or select both the first downlink reference signal and the second downlink reference signal as references.

[0164] In this embodiment, in at least one example, the random access resource is a non-contentionable random access resource associated with either the first downlink reference signal or the second downlink reference signal. If the random access resource is a non-contentionable random access resource associated with the first downlink reference signal, then in operation 401, the terminal device can select either the first downlink reference signal or a second downlink reference signal that has a QCL relationship with the first downlink reference signal. Similarly, if the random access resource is a non-contentionable random access resource associated with the second downlink reference signal, then in operation 401, the terminal device can select either the second downlink reference signal or a first downlink reference signal that has a QCL relationship with the second downlink reference signal.

[0165] In this example, the aforementioned non-contentionable random access resource can be a resource requested for beam failure recovery, and this non-contentionable random access resource can be provided (or configured) by the network device via RRC signaling. However, this application is not limited to this; the aforementioned non-contentionable random access resource can also be indicated (or notified or configured) by the network device via downlink control information (DCI).

[0166] In this embodiment, in at least one example, the random access resource is a resource requested by a System Information (SI) request.

[0167] In this example, if the random access procedure is initiated for a system information request, and if the resource requested by the system information request has been indicated (or explicitly provided or configured) by the network device via RRC signaling, then in operation 401, the terminal device can select either the aforementioned first downlink reference signal or the aforementioned second downlink reference signal that has a QCL relationship with the first downlink reference signal.

[0168] In this embodiment, during operation 403, the terminal device can select a random access preamble based on the selected downlink reference signal (first downlink reference signal and / or second downlink reference signal), and then set the index of the random access preamble to the index of the selected random access preamble.

[0169] For example, the terminal device can select a random access preamble with equal probability from the random access preamble associated with the downlink reference signal selected in operation 401, and then set the index of the random access preamble to the index of the selected random access preamble.

[0170] For example, if the random access procedure is initiated for a system information request, and if the resources requested by the system information request have been indicated (or explicitly provided or configured) by the network device via RRC signaling, the terminal device can select a random access preamble corresponding to (or associated with) the selected downlink reference signal from the random access preambles determined according to the parameter (ra-PreambleStartIndex) associated with the random access preamble index, and set the index of the random access preamble (PREAMBLE_INDEX) to the index of the selected random access preamble.

[0171] In this embodiment, during operation 403, the terminal device may also set the index of the random access preamble (PREAMBLE_INDEX) to a random access preamble index (ra-PreambleIndex) corresponding to (or associated with) the first downlink reference signal and / or the second downlink reference signal (i.e., the selected downlink reference signal and / or the downlink reference signal that is related to the selected downlink reference signal by QCL).

[0172] In the embodiments of this application, the various embodiments regarding operation 401 described above can be implemented separately or in combination, and this application does not impose any restrictions. For example, the terminal device can select the first downlink reference signal when the RSRP of the first downlink reference signal is greater than a threshold (Case 1); the terminal device can also select the first downlink reference signal when the RSRP of the second downlink reference signal is greater than a threshold (Case 2); the terminal device can also select the first downlink reference signal when the random access resource corresponding to the first downlink reference signal is configured (Case 3); the terminal device can also select the first downlink reference signal when the random access resource corresponding to the second downlink reference signal is configured (Case 4); the terminal device can also select the first downlink reference signal and / or when the RSRP of the first downlink reference signal is greater than a threshold and the random access resource corresponding to the first downlink reference signal is configured. Second downlink reference signal (Case 5); The terminal device may also select the first downlink reference signal and / or the second downlink reference signal when the RSRP of the first downlink reference signal is greater than the threshold and the random access resource corresponding to the second downlink reference signal is configured (Case 6); The terminal device may also select the first downlink reference signal and / or the second downlink reference signal when the RSRP of the second downlink reference signal is greater than the threshold and the random access resource corresponding to the first downlink reference signal is configured (Case 7); The terminal device may also select the first downlink reference signal and / or the second downlink reference signal when the RSRP of the second downlink reference signal is greater than the threshold and the random access resource corresponding to the second downlink reference signal is configured (Case 8).

[0173] Specific examples might be:

[0174] Example 1: If the random access procedure is initiated for beam failure recovery, and if no beam failure timer is configured or the beam failure timer is not running, and if the RRC explicitly provides resources for non-contention-based random access (CFRA) associated with the beam failure recovery request for a first downlink reference signal (e.g., an SSB) or a second downlink reference signal, and if a downlink reference signal (first reference signal) with an RSRP greater than a threshold in the candidateBeamRSList is available, select either the first or second downlink reference signal; furthermore, set PREAMBLE_INDEX to a ra-PreambleIndex corresponding to the first or second downlink reference signal from the random access preamble set of the beam failure recovery request. Here, the first and second downlink reference signals have a QCL relationship.

[0175] Example 2: If DCI explicitly provides ra-PreambleIndex, and if ra-PreambleIndex is not 0b00000, set PREAMBLE_INDEX to the informed ra-PreambleIndex; in addition, select the first downlink reference signal notified by DCI or select a second downlink reference signal that has a QCL relationship with the first downlink reference signal notified by DCI.

[0176] In this embodiment of the application, during operation 402, the aforementioned random access resource can be a PRACH opportunity, and the terminal device can determine (or select) the next available PRACH opportunity from a series of consecutive PRACH opportunities. Here, consecutive PRACH opportunities refer to the PRACH opportunity corresponding to the first downlink reference signal, or the PRACH opportunity corresponding to the second downlink reference signal, or the intersection of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal, or the union of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal.

[0177] In this embodiment, the MAC entity of the terminal device can select one PRACH opportunity with equal probability from the consecutive PRACH opportunities as the next available PRACH opportunity.

[0178] In this embodiment of the application, if the downlink reference signal selected this time (referred to as the fourth downlink reference signal, such as the aforementioned first downlink reference signal and / or the second downlink reference signal) has a QCL relationship with the downlink reference signal selected during the last random access preamble transmission (referred to as the third downlink reference signal), the terminal device can also increment the power boost correlation counter (PREAMBLE_POWER_RAMPING_COUNTER) by 1, thereby solving the aforementioned problem 2.

[0179] In at least one embodiment, if the downlink reference signal selected this time is SSB, and the downlink reference signal selected during the last random access preamble transmission was SSB, then the downlink reference signal SSB selected this time and the downlink reference signal SSB selected last time have a QCL relationship.

[0180] For example, if the downlink reference signal selected this time is the first SSB, and the downlink reference signal selected during the last random access preamble transmission was the second SSB, and the first SSB and the second SSB have a QCL relationship, then the power boost-related counter (e.g., PREAMBLE_POWER_RAMPING_COUNTER) is incremented by 1. Alternatively, for another example, if PREAMBLE_TRANSMISSION_COUNTER is greater than 1, and no notification of a suspended power ramp-up counter from the physical layer has been received, and if the SSB selected this time has a QCL relationship with the SSB selected during the last random access preamble transmission, then the power boost-related counter (e.g., PREAMBLE_POWER_RAMPING_COUNTER) is incremented by 1.

[0181] In at least one embodiment, if the downlink reference signal selected during the last random access preamble transmission was CSI-RS and the downlink reference signal selected this time is SSB, then the SSB, which has a QCL relationship with the previously selected downlink reference signal CSI-RS, has a QCL relationship with the currently selected downlink reference signal SSB.

[0182] In at least one embodiment, if the downlink reference signal selected during the last random access preamble transmission was SSB and the downlink reference signal selected this time is CSI-RS, then the SSB that has a QCL relationship with the downlink reference signal CSI-RS selected this time has a QCL relationship with the downlink reference signal SSB selected during the last random access preamble transmission.

[0183] The method described in the above embodiments avoids the power ramping mechanism from becoming ineffective and improves the success rate of random access.

[0184] Figure 5 This is another schematic diagram of the random access method according to an embodiment of this application, such as... Figure 5 As shown, the method includes:

[0185] Operation 501: The terminal device selects (or determines) a first downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship;

[0186] Operation 502: The terminal device determines the next available PRACH opportunity from the continuous PRACH opportunities.

[0187] In the embodiments of this application, consecutive PRACH opportunities refer to the PRACH opportunity corresponding to the first downlink reference signal, or the PRACH opportunity corresponding to the second downlink reference signal, or the intersection of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal, or the union of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal.

[0188] In this embodiment, the method for selecting the first downlink reference signal is not limited; it can be achieved through... Figure 4 This can be achieved through operation 401, or through existing means, which will not be elaborated here. The method used in this application embodiment improves the success rate of random access.

[0189] In at least one embodiment, the MAC entity of the terminal device can select one PRACH opportunity from the aforementioned consecutive PRACH opportunities with equal probability as the next available PRACH opportunity. However, this application is not limited to this; the aforementioned PRACH opportunities may not be consecutive, and the terminal device may also select the PRACH opportunity as the next available PRACH opportunity through other entities or other means.

[0190] Figure 6 This is another schematic diagram of the random access method according to an embodiment of this application, as shown below. Figure 6 As shown, the method includes:

[0191] Operation 601: If the selected downlink reference signal has a QCL relationship with the downlink reference signal selected during the last random access preamble transmission, the terminal device increments the power boost correlation counter by 1.

[0192] In this embodiment, if the selected downlink reference signal (fourth downlink reference signal) has a QCL relationship with the downlink reference signal (third downlink reference signal) selected during the last random access preamble transmission, the power boost correlation counter (PREAMBLE_POWER_RAMPING_COUNTER) is incremented by 1, thereby solving the aforementioned problem 2.

[0193] In at least one embodiment, the selected downlink reference signal (fourth downlink reference signal) is SSB, and the downlink reference signal (third downlink reference signal) selected during the last random access preamble transmission is SSB. Then, the QCL relationship in operation 601 can be that the selected downlink reference signal SSB and the downlink reference signal SSB selected during the last random access preamble transmission have a QCL relationship.

[0194] For example, if the terminal device selects the first SSB as the downlink reference signal, and the second SSB was selected during the last random access preamble transmission, and the first SSB and the second SSB have a QCL relationship, then the power boost-related counter (e.g., PREAMBLE_POWER_RAMPING_COUNTER) is incremented by 1. Alternatively, for another example, if PREAMBLE_TRANSMISSION_COUNTER is greater than 1, and no notification of a suspended power ramp-up counter from the physical layer has been received, and if the selected SSB has a QCL relationship with the SSB selected during the last random access preamble transmission, then the power boost-related counter (e.g., PREAMBLE_POWER_RAMPING_COUNTER) is incremented by 1.

[0195] In at least one embodiment, if the downlink reference signal (third downlink reference signal) selected during the last random access preamble transmission is CSI-RS and the selected downlink reference signal (fourth downlink reference signal) is SSB, then the QCL relationship in operation 601 can be that the SSB that has a QCL relationship with the downlink reference signal CSI-RS selected during the last random access preamble transmission has a QCL relationship with the selected downlink reference signal SSB.

[0196] In at least one embodiment, if the downlink reference signal (third downlink reference signal) selected during the last random access preamble transmission is SSB and the selected downlink reference signal (fourth downlink reference signal) is CSI-RS, then the QCL relationship in operation 601 can be that the SSB that has a QCL relationship with the selected downlink reference signal CSI-RS has a QCL relationship with the downlink reference signal SSB selected during the last random access preamble transmission.

[0197] The above embodiments are merely illustrative examples, and this application is not limited thereto. The method described in this application avoids the ineffectiveness of the power ramping mechanism and improves the success rate of random access.

[0198] According to the method in the embodiments of this application, when the terminal device selects a downlink reference signal (e.g., SSB), determines random access resources, and performs power ramping, it considers downlink reference signals with QCL relationships, thereby effectively utilizing more transmission opportunities provided by the network, overcoming the problems caused by LBT, and ensuring the success rate of random access through the power ramping mechanism.

[0199] Furthermore, according to the method in this application embodiment, when the terminal device performs random access resource selection, it considers downlink reference signals with QCL relationships, so that as long as one of the downlink reference signals with QCL relationships meets some or all of the conditions, it can be selected. And as long as one of the downlink reference signals with QCL relationships is selected, its corresponding random access resource can be used to transmit the random access preamble, thereby effectively utilizing the increased transmission opportunities introduced by the network to overcome LBT.

[0200] Furthermore, according to the method of this application embodiment, when the terminal device transmits the random access preamble, it considers the downlink reference signal with QCL relationship, so that when the downlink reference signal with QCL relationship is selected, the power ramp-up mechanism can still work. As the number of transmissions increases, the transmission power of sending the random access preamble can increase, thereby ensuring the success rate of random access.

[0201] Second aspect of the embodiments

[0202] The second aspect of this application provides a configuration method applied to a network device, which is a network-side processing method corresponding to the first aspect of the embodiment, wherein the same content as the first aspect of the embodiment will not be repeated.

[0203] Figure 7 This is a schematic diagram of a configuration method according to an embodiment of this application, such as... Figure 7 As shown, the method includes:

[0204] Operation 701: The network device sends the first configuration information and / or the second configuration information and / or the third configuration information.

[0205] In this embodiment of the application, the first configuration information includes one or more of the following: a first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a QCL relationship; and a random access preamble index, wherein the random access preamble index is used by the first downlink reference signal or the second downlink reference signal to determine a candidate beam.

[0206] In this embodiment, the second configuration information includes one or more of the following: dedicated random access channel configuration information, which indicates non-contentionable random access resources associated with the first downlink reference signal and / or the second downlink reference signal; an identifier of the first downlink reference signal or the second downlink reference signal, wherein the first downlink reference signal or the second downlink reference signal is a reference signal transmitted by the serving cell, and when the terminal device selects the first downlink reference signal and / or the second downlink reference signal, the random access preamble corresponding to the first downlink reference signal and / or the second downlink reference signal is available; and a random access preamble index, wherein the random access preamble index is used by the first downlink reference signal or the second downlink reference signal to determine candidate beams.

[0207] In the embodiments of this application, the third configuration information mentioned above includes one or more of the following: an index of the random access preamble; and an index of the synchronization signal or broadcast channel.

[0208] The method described in this application's embodiments configures the relevant content, ensuring a high success rate for random access.

[0209] In this application embodiment, when the first configuration information includes a first downlink reference signal, the first downlink reference signal or the second downlink reference signal can identify candidate beams for beam failure recovery and associated random access parameters.

[0210] In this embodiment, the random access preamble index can be the preamble index used by the terminal device when performing BFR by selecting a candidate beam identified by the first downlink reference signal or the second downlink reference signal.

[0211] In this embodiment, the random access preamble index can be the preamble index used by the terminal device when selecting a candidate beam identified by the first downlink reference signal or the second downlink reference signal to perform CFRA.

[0212] In the embodiments of this application, the non-contentionable random access resource can be a RACH opportunity. If Q=1 or Q is not notified or is in an unlicensed frequency band, the number of reference signals for each RACH opportunity is ssb-perRACH-Occasion.

[0213] In the embodiments of this application, the non-contentionable random access resource can be a RACH opportunity, and the number of reference signals for each RACH opportunity is Q*ssb-perRACH-Occasion.

[0214] In one embodiment, the first configuration information is a BeamFailureRecoveryConfig information element. Figure 8 This is an example of a portion of the configuration information unit for beam failure recovery. For example... Figure 8 As shown, in this beam failure recovery configuration information unit, the beam failure recovery configuration field (BeamFailureRecoveryConfig field) can be described as follows:

[0215]

[0216] In addition, such as Figure 8 As shown, in this beam failure recovery configuration information unit, the beam failure recovery synchronization signal block resource field (BFR-SSB-Resource field) can be described as follows:

[0217]

[0218] That is, in the embodiments of this application, if there is an SSB indicating a candidate beam, an SSB that has a QCL relationship with an SSB included in the candidate beam list can also be used to determine the candidate beam. Furthermore, the configured random access preamble can be used for candidate beams determined by an SSB, or for candidate beams determined by an SSB that has a QCL relationship with that SSB.

[0219] In one embodiment, the second configuration information is a Random Access Channel Dedicated Information Element (RACH-ConfigDedicated information element). Figure 9 This is an example of a portion of the dedicated configuration information unit for the random access channel. For example... Figure 9 As shown, in this dedicated configuration information unit for the random access channel, the non-contention-based random access domain (CFRA) can be described as follows:

[0220]

[0221] In addition, such as Figure 9 As shown, in this dedicated configuration information unit for random access channels, the non-contentionable random access synchronization signal block resource field can be described as follows:

[0222]

[0223] That is, in this embodiment, the number of SSBs for each RACH occasion is considered to be Q: the number of SSBs corresponding to each RACH occasion is ssb-perRACH-Occasion*Q. Furthermore, the configured random access preamble can be used for candidate beams determined by an SSB, or for candidate beams determined by an SSB with a QCL relationship to that SSB. Also, an SSB is used as an index for a resource, including that SSB and an SSB with a QCL relationship to that SSB.

[0224] In one embodiment, the third configuration information is downlink control information (DCI). The network device may indicate an additional random access preamble index or an additional SS / PBCH index. For example, it may use reserved bits in DCI format 1_0 or use a new DCI format. Alternatively, fewer bits may be used to indicate the first / last N bits of a set of random access preamble or SS / PBCH indices, where N is an integer less than or equal to 5 and greater than 1.

[0225] The method according to the embodiments of this application improves the success rate of random access.

[0226] Third aspect of the embodiments

[0227] The third aspect of this application provides a random access device configured on a terminal device. Since the principle of this device in solving the problem is similar to that of the first aspect, its specific implementation can be referred to the first aspect, and the similarities will not be repeated.

[0228] Figure 10 This is a schematic diagram of the random access device in this embodiment, as shown below. Figure 10 As shown, the device 1000 includes: a first selection unit 1001 and a determination unit 1002. The first selection unit 1001 is used to select (or determine) a first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship. The determination unit 1002 is used to determine (or select) random access resources based on the first downlink reference signal and / or the second downlink reference signal.

[0229] In this embodiment of the application, the first downlink reference signal and the second downlink reference signal having a QCL relationship means that the value of modulo(A,Q) corresponding to the first downlink reference signal is the same as the value of modulo(A,Q) corresponding to the second downlink reference signal, where A is the sequence index of the physical broadcast channel downlink demodulation reference signal (PBCH DMRS) and Q is a parameter or set value configured by the network device.

[0230] In the embodiments of this application, such as Figure 10 As shown, the device 1000 may further include:

[0231] Setting unit 1003 sets (or determines) random access preamble based on the first downlink reference signal and / or the second downlink reference signal.

[0232] In at least one embodiment, if the downlink reference signal selected by the first selection unit 1001 is included in the downlink control information sent by the network device, then the setting unit 1003 sets the index of the random access preamble to an index indicated (or explicitly provided) in the downlink control information; if the downlink reference signal selected by the first selection unit 1001 is not included in the downlink control information sent by the network device, then the setting unit 1003 sets the index of the random access preamble to an index corresponding to (or associated with) the selected downlink reference signal.

[0233] In at least one embodiment, the setting unit 1003 sets the index of the random access preamble to a random access preamble index (ra-PreambleIndex) corresponding to (or associated with) the first downlink reference signal and / or the second downlink reference signal (the selected downlink reference signal and / or the downlink reference signal that has a QCL relationship with the selected downlink reference signal).

[0234] In at least one embodiment, such as Figure 10 As shown, the device 1000 further includes:

[0235] The second selection unit 1004 selects a random access preamble based on the first downlink reference signal and / or the second downlink reference signal, and the setting unit 1003 sets the index of the random access preamble to the index of the random access preamble selected by the second selection unit 1004.

[0236] In this embodiment, the second selection unit 1004 can select a random access preamble with equal probability from the random access preamble associated with the downlink reference signal selected by the first selection unit 1001, and the setting unit 1003 sets the index of the random access preamble to the index of the selected random access preamble.

[0237] In this embodiment, if the random access procedure is initiated for a system information request, and the resources requested by the system information request have been indicated (or explicitly provided) by the network device via RRC signaling, then the second selection unit 1004 selects a random access preamble corresponding to the downlink reference signal selected by the first selection unit 1001 from the random access preambles determined according to the parameter (ra-PreambleStartIndex) associated with the random access preamble index, and the setting unit 1003 sets the index of the random access preamble to the index of the selected random access preamble.

[0238] In at least one embodiment, the setting unit 1003 sets the index of the random access preamble to a random access preamble index (ra-PreambleIndex) corresponding to (or associated with) the first downlink reference signal and / or the second downlink reference signal (the selected downlink reference signal and / or the downlink reference signal that has a QCL relationship with the selected downlink reference signal).

[0239] In at least one embodiment, if the network device indicates (or explicitly provides) the index of the random access preamble via downlink control information, and the index of the random access preamble is not 0b00000, then the downlink reference signal (first downlink reference signal and / or second downlink reference signal) selected by the first selection unit 1001 is included in the downlink control information, or has a QCL relationship with the downlink reference signal notified by the downlink control information. That is, the first downlink reference signal and / or second downlink reference signal selected by the first selection unit 1001 is notified by the downlink control information, or has a QCL relationship with the downlink reference signal notified by the downlink control information. For example, the first downlink reference signal is selected, which is notified by the DCI, or the second downlink reference signal is notified by the DCI. As another example, the second downlink reference signal is selected, the first downlink reference signal is notified by the DCI, or the second downlink reference signal is notified by the DCI.

[0240] In this embodiment, the multiple downlink reference signals in the downlink control information have a QCL relationship. The downlink reference signal (first downlink reference signal and / or second downlink reference signal) selected by the first selection unit 1001 is selected from the multiple downlink reference signals, and the downlink reference signal selected by the first selection unit 1001 is one or more.

[0241] In at least one embodiment, the first selection unit 1001 selects the first downlink reference signal, or selects the second downlink reference signal, or selects both the first downlink reference signal and the second downlink reference signal if at least one of the following conditions is met:

[0242] The RSRP of the first downlink reference signal is greater than the threshold;

[0243] The RSRP of the second downlink reference signal is greater than the threshold;

[0244] The first downlink reference signal is included in a list of candidate beam reference signals for configuring beam failure recovery;

[0245] The second downlink reference signal is included in the list of candidate beam reference signals for configuring beam failure recovery;

[0246] The first downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0247] The second downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0248] The non-contention-based random access resources associated with the first downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0249] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0250] The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used for a contention-based random access preamble selection process;

[0251] The second downlink reference signal is not configured with non-contention-based random access resources or is used for a contention-based random access preamble selection process.

[0252] In at least one embodiment, if the RSRP of the first downlink reference signal is greater than a threshold, the first selection unit 1001 selects the first downlink reference signal; if the RSRP of the second downlink reference signal is greater than the threshold, the first selection unit 1001 selects the second downlink reference signal.

[0253] In this embodiment, if the first downlink reference signal satisfies at least one of the following conditions 1, then the first selection unit 1001 selects the first downlink reference signal; if the second downlink reference signal satisfies at least one of the following conditions 2, then the first selection unit 1001 selects the second downlink reference signal.

[0254] Condition 1 includes:

[0255] The first downlink reference signal is included in the candidate beam reference signal list (candidateBeamRSList) used to configure beam failure recovery;

[0256] The first downlink reference signal is indicated (or provided) by the network device via downlink control information (DCI);

[0257] The non-contention-based random access resource associated with the first downlink reference signal is indicated (or explicitly provided) by the random access channel-specific configuration information (rach-ConfigDedicated);

[0258] The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used for a contention-based random access preamble selection process.

[0259] Condition 2 includes:

[0260] The second downlink reference signal is included in the candidate beam reference signal list (candidateBeamRSList) used to configure beam failure recovery;

[0261] The second downlink reference signal is indicated (or provided) by the network device via downlink control information (DCI);

[0262] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information (rach-ConfigDedicated);

[0263] The second downlink reference signal is not configured with non-contention-based random access resources or is used for a contention-based random access preamble selection process.

[0264] In at least one embodiment, if the random access resource associated with the first downlink reference signal is configured, the first selection unit 1001 selects the first downlink reference signal; if the random access resource associated with the second downlink reference signal is configured, the first selection unit 1001 selects the second downlink reference signal.

[0265] In this embodiment, if the random access resource satisfies at least one of the following conditions 3, the first selection unit selects a first downlink reference signal; if the random access resource satisfies at least one of the following conditions 4, the first selection unit selects a second downlink reference signal.

[0266] Condition 3 includes:

[0267] The random access resources associated with the first downlink reference signal are non-contentionable random access resources;

[0268] The random access resource associated with the first downlink reference signal is the resource for system information requests.

[0269] Condition 4 includes:

[0270] The random access resources associated with the second downlink reference signal are non-contentionable random access resources;

[0271] The random access resources associated with the second downlink reference signal are resources for system information requests.

[0272] In this embodiment, in at least one example, the non-contentionable random access resource is a resource requested for beam failure recovery, and the non-contentionable random access resource is provided by the network device via RRC signaling.

[0273] In this embodiment, in at least one example, the non-contentionable random access resources are indicated (or notified) by the network device via downlink control information (DCI).

[0274] In this example, in at least one instance, the random access procedure is initiated in response to a system information request, and the resources requested for the system information are indicated (or explicitly provided) by the network device via RRC signaling.

[0275] In this embodiment of the application, the random access resource is a PRACH opportunity, and the determining unit 1002 determines (or selects) the next available PRACH opportunity from the consecutive PRACH opportunities.

[0276] In this example, consecutive PRACH opportunities refer to the PRACH opportunity corresponding to the first downlink reference signal, or the PRACH opportunity corresponding to the second downlink reference signal, or the intersection of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal, or the union of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal.

[0277] In this embodiment, the determining unit 1002 determines, with equal probability, one PRACH opportunity from the consecutive PRACH opportunities selected by the MAC entity of the terminal device as the next available PRACH opportunity.

[0278] In the embodiments of this application, such as Figure 10 As shown, the device 1000 further includes:

[0279] If the downlink reference signal (the fourth downlink reference signal, i.e., the aforementioned first downlink reference signal and / or the second downlink reference signal) selected by the first selection unit 1001 has a QCL relationship with the third downlink reference signal, then the processing unit 1005 increments the power boost correlation counter by 1. The third downlink reference signal is the downlink reference signal selected during the last random access preamble transmission.

[0280] In one embodiment, the downlink reference signal selected by the first selection unit 1001 is SSB, the third downlink reference signal is SSB, and the downlink reference signal SSB selected by the first selection unit 1001 and the third downlink reference signal SSB have a QCL relationship.

[0281] In another embodiment, the third downlink reference signal is CSI-RS, and the downlink reference signal selected by the first selection unit 1001 is SSB. Then, the SSB that has a QCL relationship with the third downlink reference signal CSI-RS has a QCL relationship with the SSB selected by the first selection unit 1001.

[0282] In another embodiment, the third downlink reference signal is SSB, and the downlink reference signal selected by the first selection unit 1001 is CSI-RS. Then, the SSB that has a QCL relationship with the CSI-RS selected by the first selection unit 1001 has a QCL relationship with the third downlink reference signal SSB.

[0283] Figure 11 This is another schematic diagram of the random access device according to an embodiment of this application, such as... Figure 11 As shown, the device 1100 includes: a selection unit 1101 and a determination unit 1102. The selection unit 1101 is used to select (or determine) a first downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship; the determination unit 1102 is used to determine the next available PRACH opportunity from a series of PRACH opportunities.

[0284] In this embodiment of the application, the consecutive PRACH opportunities refer to the PRACH opportunities corresponding to the first downlink reference signal, or the PRACH opportunities corresponding to the second downlink reference signal, or the intersection of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal, or the union of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal.

[0285] In at least one embodiment, the determining unit 1102 may select one PRACH opportunity as the next available PRACH opportunity from the consecutive PRACH opportunities with equal probability from the MAC entity of the terminal device.

[0286] Figure 12 This is another schematic diagram of a random access device according to an embodiment of this application, as shown below. Figure 12 The device 1200 includes a processing unit 1201, which increments a power boost correlation counter by 1 if the selected downlink reference signal has a QCL relationship with the downlink reference signal selected during the last random access preamble transmission.

[0287] In at least one embodiment, the selected downlink reference signal is SSB, and the downlink reference signal selected during the last random access preamble transmission is SSB. The selected downlink reference signal SSB and the downlink reference signal SSB selected during the last random access preamble transmission have a QCL relationship.

[0288] In at least one embodiment, if the downlink reference signal selected during the last random access preamble transmission is CSI-RS and the selected downlink reference signal is SSB, then the SSB that has a QCL relationship with the downlink reference signal CSI-RS selected during the last random access preamble transmission has a QCL relationship with the selected downlink reference signal SSB.

[0289] In at least one embodiment, if the downlink reference signal selected during the last random access preamble transmission is SSB and the selected downlink reference signal is CSI-RS, then the SSB that has a QCL relationship with the selected downlink reference signal CSI-RS has a QCL relationship with the downlink reference signal SSB selected during the last random access preamble transmission.

[0290] The apparatus according to the embodiments of this application improves the success rate of random access.

[0291] Fourth aspect of the embodiment

[0292] The fourth aspect of this application also provides a configuration device configured on a network device. Since the principle of this device in solving the problem is similar to the method of the second aspect, its specific implementation can be referred to the second aspect. The same content will not be repeated.

[0293] Figure 13 This is a schematic diagram of the configuration device 1300 in this embodiment, as shown below. Figure 13 As shown, the device 1300 includes:

[0294] The sending unit 1301 sends first configuration information and / or second configuration information and / or third configuration information.

[0295] In this embodiment of the application, the first configuration information includes one or more of the following:

[0296] A first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a QCL relationship; and

[0297] Random access preamble index, wherein the random access preamble index is used by the first downlink reference signal or the second downlink reference signal to determine candidate beams;

[0298] In this embodiment of the application, the second configuration information includes one or more of the following:

[0299] Random access channel dedicated configuration information, which indicates the non-contentionable random access resources associated with the first downlink reference signal and / or the second downlink reference signal;

[0300] The identifier of the first downlink reference signal or the second downlink reference signal, wherein the first downlink reference signal or the second downlink reference signal is a reference signal transmitted by the serving cell, and, when the terminal device selects the first downlink reference signal and / or the second downlink reference signal, the random access preamble corresponding to the first downlink reference signal and / or the second downlink reference signal is available; and

[0301] A random access preamble index, wherein the random access preamble index corresponds to a random access preamble used by the first downlink reference signal or the second downlink reference signal to determine candidate beams.

[0302] In this embodiment of the application, the third configuration information includes one or more of the following:

[0303] The index of the random access preamble; and

[0304] Index of synchronization signal or broadcast channel.

[0305] In at least one embodiment, the first configuration information is a BeamFailureRecoveryConfig information element; the second configuration information is a Random Access Channel-Dedicated Information Element (RACH-ConfigDedicated Information Element); and the third configuration information is downlink control information (DCI).

[0306] In at least one embodiment, when the first configuration information includes the first downlink reference signal, the first downlink reference signal or the second downlink reference signal identifies a candidate beam for beam failure recovery and associated random access parameters.

[0307] In at least one embodiment, the random access preamble index is the preamble index used by the terminal device when performing BFR by selecting a candidate beam identified by the first downlink reference signal or the second downlink reference signal.

[0308] In at least one embodiment, the random access preamble index is the preamble index used by the terminal device when performing CFRA by selecting a candidate beam identified by the first downlink reference signal or the second downlink reference signal.

[0309] In at least one embodiment, the non-contentionable random access resource is a RACH opportunity, and the number of reference signals for each RACH opportunity is ssb-perRACH-Occasion if Q=1 or Q is not notified or is in an unlicensed frequency band.

[0310] In at least one embodiment, the non-contentionable random access resource is a RACH opportunity, and the number of reference signals for each RACH opportunity is Q*ssb-perRACH-Occasion.

[0311] The apparatus according to the embodiments of this application improves the success rate of random access.

[0312] Fifth aspect of the embodiment

[0313] This application also provides a terminal device, wherein the terminal device includes the random access device described in the third aspect of the embodiment.

[0314] Figure 14 This is a schematic diagram of a terminal device according to an embodiment of this application. Figure 14 As shown, the terminal device 1400 may include a central processing unit 1401 and a memory 1402; the memory 1402 is coupled to the central processing unit 1401. It is worth noting that this figure is exemplary; other types of structures may be used to supplement or replace this structure to implement telecommunications functions or other functions.

[0315] In one embodiment, the functionality of the device described in the third aspect embodiment can be integrated into a central processing unit 1401, which implements the functionality of the device described in the third aspect embodiment. The functionality of the device described in the third aspect embodiment is incorporated herein and will not be described again.

[0316] In another embodiment, the device described in the third aspect embodiment can be configured separately from the central processing unit 1401. For example, the device described in the third aspect embodiment can be configured as a chip connected to the central processing unit 1401, and the functions of the device described in the third aspect embodiment can be realized through the control of the central processing unit 1401.

[0317] like Figure 14 As shown, the terminal device 1400 may further include: a communication module 1403, an input unit 1404, an audio processing unit 1405, a display 1406, and a power supply 1407. It is worth noting that the terminal device 1400 is not necessarily required to include these components. Figure 14 All components shown; in addition, the terminal device 1400 may also include Figure 14 For components not shown, please refer to existing technologies.

[0318] like Figure 14 As shown, the central processing unit 1401, sometimes also referred to as a controller or operation control, may include a microprocessor or other processor device and / or logic device. The central processing unit 1401 receives input and controls the operation of various components of the terminal device 1400.

[0319] The memory 1402 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It can store the aforementioned configuration-related information, and also stores programs for executing that information. The central processing unit 1401 can execute the program stored in the memory 1402 to perform information storage or processing, etc. The functions of other components are similar to those in existing systems and will not be described further here. The various components of the terminal device 1400 can be implemented using dedicated hardware, firmware, software, or a combination thereof, without departing from the scope of this application.

[0320] The terminal device in this embodiment improves the success rate of random access.

[0321] Implementation of the sixth aspect

[0322] This application also provides a network device, wherein the network device includes the configuration apparatus described in the fourth aspect of the embodiment.

[0323] Figure 15 This is a schematic diagram illustrating one embodiment of the network device described in this application. For example... Figure 15As shown, the network device 1500 may include a central processing unit (CPU) 1501 and a memory 1502; the memory 1502 is coupled to the CPU 1501. The memory 1502 can store various types of data; it also stores information processing programs, and executes these programs under the control of the CPU 1501 to receive and send various types of information to terminal devices.

[0324] In one embodiment, the functionality of the device described in the fourth aspect embodiment can be integrated into a central processing unit 1501, which implements the functionality of the device described in the fourth aspect embodiment. The functionality of the device described in the fourth aspect embodiment is incorporated herein and will not be described again.

[0325] In another embodiment, the device described in the fourth aspect embodiment can be configured separately from the central processing unit 1501. For example, the device described in the fourth aspect embodiment can be a chip connected to the central processing unit 1501, and the function of the device described in the fourth aspect embodiment can be realized through the control of the central processing unit 1501.

[0326] In addition, such as Figure 15 As shown, network device 1500 may also include: transceiver 1503 and antenna 1504, etc.; the functions of the above components are similar to those in the prior art, and will not be described in detail here. It is worth noting that network device 1500 is not necessarily required to include... Figure 15 All components shown; in addition, network device 1500 may also include Figure 15 For components not shown, please refer to existing technologies.

[0327] The network device in this embodiment improves the success rate of random access.

[0328] Seventh aspect of the embodiment

[0329] This application also provides a communication system, which includes a network device and a terminal device. The network device is, for example, the network device 1500 described in the sixth aspect embodiment, and the terminal device is, for example, the terminal device 1400 described in the fifth aspect embodiment.

[0330] In this embodiment, the terminal device is, for example, a UE serving a gNB. In addition to the functions of the device described in the third aspect of the embodiment, it also includes the conventional components and functions of a terminal device, as described in the fifth aspect of the embodiment, which will not be repeated here.

[0331] In this embodiment, the network device may be, for example, a gNB in ​​NR, which, in addition to including the functions of the device described in the fourth aspect embodiment, also includes the conventional components and functions of a network device, as described in the sixth aspect embodiment, and will not be repeated here.

[0332] The communication system in this embodiment improves the success rate of random access.

[0333] This application also provides a computer-readable program, wherein when the program is executed in a terminal device, the program causes the computer to perform the method described in the first aspect of the embodiment in the terminal device.

[0334] This application also provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer in a terminal device to perform the method described in the first aspect of the embodiments.

[0335] This application also provides a computer-readable program, wherein when the program is executed in a network device, the program causes the computer to perform the method described in the second aspect of the embodiment in the network device.

[0336] This application also provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer in a network device to perform the methods described in the second aspect of the embodiments.

[0337] The apparatus and methods described above in this application can be implemented in hardware or in combination with software. This application relates to a computer-readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to implement the various methods or steps described above. Logic components include, for example, field-programmable logic devices (FPGAs), microprocessors, and processors used in computers. This application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, and flash memory.

[0338] The methods / apparatus described in conjunction with the embodiments of this application can be directly embodied in hardware, software modules executed by a processor, or a combination of both. For example, one or more and / or combinations of one or more functional block diagrams shown in the figures can correspond to various software modules in a computer program flow, or to various hardware modules. These software modules can correspond to the various steps shown in the figures, respectively. These hardware modules can be implemented, for example, using a field-programmable gate array (FPGA) to embed these software modules.

[0339] The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor, enabling the processor to read information from and write information to the storage medium; or the storage medium can be an integral part of the processor. The processor and storage medium can reside in an ASIC. The software module can be stored in the memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a high-capacity MEGA-SIM card or a high-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the high-capacity flash memory device.

[0340] One or more and / or one or more combinations of functional blocks described in the accompanying drawings can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein. One or more and / or one or more combinations of functional blocks described in the accompanying drawings can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other device.

[0341] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.

[0342] Regarding the above-described embodiments disclosed in this example, the following notes are also disclosed:

[0343] 1. A random access device configured in a terminal device, wherein the device comprises:

[0344] A first selection unit selects (or determines) a first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship.

[0345] The determining unit determines (or selects) random access resources based on the first downlink reference signal and / or the second downlink reference signal.

[0346] 2. According to the apparatus described in Appendix 1, the first downlink reference signal and the second downlink reference signal having a QCL relationship means that the value of modulo(A,Q) corresponding to the first downlink reference signal is the same as the value of modulo(A,Q) corresponding to the second downlink reference signal, where A is the sequence index of the physical broadcast channel downlink demodulation reference signal (PBCH DMRS) and Q is a parameter or setpoint configured by the network device.

[0347] 3. The apparatus according to Appendix 1 or 2, wherein the apparatus further comprises:

[0348] The setting unit sets (or determines) the random access preamble based on the first downlink reference signal and / or the second downlink reference signal.

[0349] 3.0 The apparatus according to Appendix 3, wherein,

[0350] If the downlink reference signal selected by the first selection unit is included in the downlink control information sent by the network device, the setting unit sets the index of the random access preamble to an index indicated (or explicitly provided) in the downlink control information.

[0351] If the downlink reference signal selected by the first selection unit is not included in the downlink control information sent by the network device, the setting unit sets the index of the random access preamble to an index corresponding to (or associated with) the selected downlink reference signal.

[0352] 3.1 The apparatus according to Appendix 3, wherein,

[0353] The setting unit sets the index of the random access preamble to a random access preamble index (ra-PreambleIndex) corresponding to (or associated with) the first downlink reference signal and / or the second downlink reference signal (the selected downlink reference signal and / or the downlink reference signal that has a QCL relationship with the selected downlink reference signal).

[0354] 3.2 The apparatus according to Appendix 3, wherein the apparatus further comprises:

[0355] The second selection unit selects a random access preamble based on the first downlink reference signal and / or the second downlink reference signal;

[0356] The setting unit sets the index of the random access preamble to the index of the random access preamble selected by the second selection unit.

[0357] 3.3. The apparatus according to Appendix 3.2, wherein,

[0358] The second selection unit selects a random access preamble with equal probability from the random access preambles associated with the downlink reference signal selected by the first selection unit.

[0359] 3.4. The apparatus according to Appendix 3.2, wherein,

[0360] If the random access procedure is initiated for a system information request, and the resources requested for the system information request have been indicated (or explicitly provided) by the network device via RRC signaling, then the second selection unit selects a random access preamble from the random access preambles determined according to parameters related to the random access preamble index that corresponds to the downlink reference signal selected by the first selection unit, and the setting unit sets the index of the random access preamble to the index of the selected random access preamble.

[0361] 4. The apparatus according to any one of Appendices 1 to 3, wherein,

[0362] If the network device indicates (or explicitly provides) the index of the random access preamble through downlink control information, and the index of the random access preamble is not 0b00000, then the downlink reference signal selected by the first selection unit is included in the downlink control information, or has a QCL relationship with the downlink reference signal notified by the downlink control information.

[0363] 4.1 The apparatus according to Appendix 4, wherein the plurality of downlink reference signals in the downlink control information have a QCL relationship, the downlink reference signal selected by the first selection unit is selected from the plurality of downlink reference signals, and the downlink reference signal selected by the first selection unit is one or more.

[0364] 5. The apparatus according to any one of Appendices 1 to 3, wherein the first selection unit selects the first downlink reference signal if at least one of the following conditions is satisfied by the first downlink reference signal and the second downlink reference signal:

[0365] The RSRP of the first downlink reference signal is greater than the threshold;

[0366] The RSRP of the second downlink reference signal is greater than the threshold;

[0367] The first downlink reference signal is included in a list of candidate beam reference signals for configuring beam failure recovery;

[0368] The second downlink reference signal is included in the list of candidate beam reference signals for configuring beam failure recovery;

[0369] The first downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0370] The second downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0371] The non-contention-based random access resources associated with the first downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0372] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0373] The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used for a contention-based random access preamble selection process;

[0374] The second downlink reference signal is not configured with non-contention-based random access resources or is used for a contention-based random access preamble selection process.

[0375] 6. The apparatus according to any one of Appendices 1 to 3, wherein the first selection unit selects the second downlink reference signal if at least one of the following conditions is satisfied by the first downlink reference signal and the second downlink reference signal:

[0376] The RSRP of the first downlink reference signal is greater than the threshold;

[0377] The RSRP of the second downlink reference signal is greater than the threshold;

[0378] The first downlink reference signal is included in a list of candidate beam reference signals for configuring beam failure recovery;

[0379] The second downlink reference signal is included in the list of candidate beam reference signals for configuring beam failure recovery;

[0380] The first downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0381] The second downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0382] The non-contention-based random access resources associated with the first downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0383] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0384] The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used for a contention-based random access preamble selection process;

[0385] The second downlink reference signal is not configured with non-contention-based random access resources or is used for a contention-based random access preamble selection process.

[0386] 7. The apparatus according to any one of Appendices 1 to 3, wherein the first selection unit selects the first downlink reference signal and the second downlink reference signal if at least one of the following conditions is satisfied:

[0387] The RSRP of the first downlink reference signal is greater than the threshold;

[0388] The RSRP of the second downlink reference signal is greater than the threshold;

[0389] The first downlink reference signal is included in a list of candidate beam reference signals for configuring beam failure recovery;

[0390] The second downlink reference signal is included in the list of candidate beam reference signals for configuring beam failure recovery;

[0391] The first downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0392] The second downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0393] The non-contention-based random access resources associated with the first downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0394] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0395] The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used for a contention-based random access preamble selection process;

[0396] The second downlink reference signal is not configured with non-contention-based random access resources or is used for a contention-based random access preamble selection process.

[0397] 8. The apparatus according to any one of Annexes 1 to 3, wherein,

[0398] If the RSRP of the first downlink reference signal is greater than the threshold, the first selection unit selects the first downlink reference signal; otherwise, if the RSRP of the second downlink reference signal is greater than the threshold, the first selection unit selects the second downlink reference signal.

[0399] 8.1 The apparatus according to Appendix 8, wherein the first selection unit selects the first downlink reference signal if the first downlink reference signal satisfies at least one of the following conditions 1; otherwise, the first selection unit selects the second downlink reference signal if the second downlink reference satisfies at least one of the following conditions 2:

[0400] Condition 1 includes:

[0401] The first downlink reference signal is included in a list of candidate beam reference signals for configuring beam failure recovery;

[0402] The first downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0403] The non-contention-based random access resources associated with the first downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0404] The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used for a contention-based random access preamble selection process;

[0405] Condition 2 includes:

[0406] The second downlink reference signal is included in the list of candidate beam reference signals for configuring beam failure recovery;

[0407] The second downlink reference signal is indicated (or provided) by the network device through downlink control information;

[0408] The non-contention-based random access resources associated with the second downlink reference signal are indicated (or explicitly provided) by the random access channel-specific configuration information;

[0409] The second downlink reference signal is not configured with non-contention-based random access resources or is used for a contention-based random access preamble selection process.

[0410] 9. The apparatus according to any one of Appendices 1 to 3, wherein,

[0411] If the random access resource associated with the first downlink reference signal is configured, the first selection unit selects the first downlink reference signal; otherwise, if the random access resource associated with the second downlink reference signal is configured, the first selection unit selects the second downlink reference signal.

[0412] 9.1 The apparatus according to Appendix 9, wherein if the random access resource satisfies at least one of the following conditions 3, the first selection unit selects the first downlink reference signal; otherwise, if the random access resource satisfies at least one of the following conditions 4, the first selection unit selects the second downlink reference signal:

[0413] Condition 3 includes:

[0414] The random access resources associated with the first downlink reference signal are non-contentionable random access resources;

[0415] The random access resource associated with the first downlink reference signal is the resource requested by the system information (SI);

[0416] Condition 4 includes:

[0417] The random access resources associated with the second downlink reference signal are non-contentionable random access resources;

[0418] The random access resource associated with the second downlink reference signal is the resource requested by the system information (SI).

[0419] 9.1.1 The apparatus according to Appendix 9.1, wherein the non-contentionable random access resource is a resource requested for beam failure recovery, and the non-contentionable random access resource is provided by the network device via RRC signaling.

[0420] 9.1.2. The apparatus according to Appendix 9.1, wherein the non-contentionable random access resources are indicated (or notified) by the network device via downlink control information (DCI).

[0421] 9.1.3. The apparatus according to Appendix 9.1, wherein the random access procedure is initiated in response to a system information request, and the resources requested by the system information request are indicated (or explicitly provided) by the network device via RRC signaling.

[0422] 10. The apparatus according to any one of Appendices 1 to 3, wherein the random access resource is a PRACH opportunity, and the determining unit determines (or selects) the next available PRACH opportunity from a series of consecutive PRACH opportunities; the series of consecutive PRACH opportunities refers to the PRACH opportunity corresponding to the first downlink reference signal, or the PRACH opportunity corresponding to the second downlink reference signal, or the intersection of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal, or the union of the PRACH opportunity corresponding to the first downlink reference signal and the PRACH opportunity corresponding to the second downlink reference signal.

[0423] 10.1 The apparatus according to Appendix 10, wherein the determining unit selects one PRACH opportunity as the next available PRACH opportunity from the consecutive PRACH opportunities by the MAC entity of the terminal device with equal probability.

[0424] 11. The apparatus according to any one of Annexes 1 to 3, wherein the apparatus further comprises:

[0425] If the downlink reference signal selected by the first selection unit has a QCL relationship with the third downlink reference signal, the processing unit increments the power boost correlation counter by 1. The third downlink reference signal is the downlink reference signal selected during the last random access preamble transmission.

[0426] 11.1 The apparatus according to Appendix 11, wherein the downlink reference signal selected by the first selection unit is SSB, the third downlink reference signal is SSB, and the downlink reference signal SSB selected by the first selection unit and the third downlink reference signal SSB have a QCL relationship.

[0427] 11.2. According to the apparatus described in Appendix 11, wherein the third downlink reference signal is CSI-RS and the downlink reference signal selected by the first selection unit is SSB, then the SSB that has a QCL relationship with the third downlink reference signal CSI-RS has a QCL relationship with the downlink reference signal SSB selected by the first selection unit.

[0428] 11.3. According to the apparatus described in Appendix 11, wherein the third downlink reference signal is SSB and the downlink reference signal selected by the first selection unit is CSI-RS, then the SSB that has a QCL relationship with the downlink reference signal CSI-RS selected by the first selection unit has a QCL relationship with the third downlink reference signal SSB.

[0429] 1A. A random access device configured in a terminal device, wherein the device comprises:

[0430] The selection unit selects (or determines) a first downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a quasi-cooperative positioning (QCL) relationship;

[0431] The determining unit identifies the next available PRACH opportunity from a series of PRACH opportunities;

[0432] The consecutive PRACH opportunities refer to the PRACH opportunities corresponding to the first downlink reference signal, or the PRACH opportunities corresponding to the second downlink reference signal, or the intersection of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal, or the union of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal.

[0433] 2A. The apparatus according to Appendix 1A, wherein the determining unit selects one PRACH opportunity as the next available PRACH opportunity from the consecutive PRACH opportunities by the MAC entity of the terminal device with equal probability.

[0434] 1B. A random access device configured in a terminal device, wherein the device comprises:

[0435] The processing unit increments the power boost correlation counter by 1 if the selected downlink reference signal has a QCL relationship with the downlink reference signal selected during the last random access preamble transmission.

[0436] 2B. The apparatus according to Appendix 1B, wherein the selected downlink reference signal is SSB, the downlink reference signal selected during the last random access preamble transmission is SSB, and the selected downlink reference signal SSB and the downlink reference signal SSB selected during the last random access preamble transmission have a QCL relationship.

[0437] 3B. The apparatus according to Appendix 1B, wherein the selected downlink reference signal is SSB, the downlink reference signal selected during the last random access preamble transmission is CSI-RS, and the selected downlink reference signal SSB and the SSB that have a QCL relationship with the downlink reference signal CSI-RS selected during the last random access preamble transmission have a QCL relationship.

[0438] 4B. The apparatus according to Appendix 1B, wherein the selected downlink reference signal is CSI-RS, the downlink reference signal selected during the last random access preamble transmission is SSB, and the SSB that has a QCL relationship with the selected downlink reference signal CSI-RS has a QCL relationship with the downlink reference signal SSB selected during the last random access preamble transmission.

[0439] 1C. A configuration device configured on a network device, wherein the device comprises:

[0440] The sending unit sends first configuration information and / or second configuration information and / or third configuration information to the terminal device.

[0441] The first configuration information includes one or more of the following:

[0442] A first downlink reference signal and / or a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal have a QCL relationship; and

[0443] Random access preamble index, wherein the random access preamble index is used by the first downlink reference signal or the second downlink reference signal to determine candidate beams;

[0444] The second configuration information includes one or more of the following:

[0445] Random access channel dedicated configuration information, which indicates the non-contentionable random access resources associated with the first downlink reference signal and / or the second downlink reference signal;

[0446] The identifier of the first downlink reference signal or the second downlink reference signal, wherein the first downlink reference signal or the second downlink reference signal is a reference signal transmitted by the serving cell, and, when the terminal device selects the first downlink reference signal and / or the second downlink reference signal, the random access preamble corresponding to the first downlink reference signal and / or the second downlink reference signal is available; and

[0447] Random access preamble index, wherein the random access preamble index corresponds to a random access preamble used by the first downlink reference signal or the second downlink reference signal to determine candidate beams.

[0448] The third configuration information includes one or more of the following:

[0449] The index of the random access preamble; and

[0450] Index of synchronization signal or broadcast channel.

[0451] 1.1C. The apparatus according to Appendix 1C, wherein the first configuration information is a BeamFailureRecoveryConfig information element; the second configuration information is a Random Access Channel-ConfigDedicated information element; and the third configuration information is downlink control information (DCI).

[0452] 2C. The apparatus according to Appendix 1C, wherein when the first configuration information includes the first downlink reference signal, the first downlink reference signal or the second downlink reference signal identifies a candidate beam for beam failure recovery and associated random access parameters.

[0453] 3C. The apparatus according to Appendix 1C, wherein the random access preamble index is: the preamble index used by the terminal device when performing BFR by selecting a candidate beam identified by the first downlink reference signal or the second downlink reference signal.

[0454] 4C. The apparatus according to Appendix 1C, wherein the random access preamble index is: the preamble index used by the terminal device when selecting a candidate beam identified by the first downlink reference signal or the second downlink reference signal to perform CFRA.

[0455] 5C. The apparatus according to Appendix 1C, wherein the non-contentionable random access resource is a RACH opportunity, and the number of reference signals for each RACH opportunity is ssb-perRACH-Occasion if Q=1 or Q is not notified or is in an unlicensed frequency band.

[0456] 6C. The apparatus according to Appendix 1C, wherein the non-contentionable random access resource is a RACH opportunity, and the number of reference signals for each RACH opportunity is Q*ssb-perRACH-Occasion.

Claims

1. A random access device configured in a terminal device for performing shared spectrum operations, wherein, The device includes: The first selection unit selects a first downlink reference signal and a second downlink reference signal within a transmission window based on the value of modulo(A,Q). The values ​​of modulo(A,Q) corresponding to the first downlink reference signal and the second downlink reference signal are the same. A is the sequence index of the Physical Broadcast Channel Downlink Demodulation Reference Signal (PBCH DMRS), and Q is a parameter or setpoint configured by the network device. The determining unit determines random access resources based on the selected first downlink reference signal and / or the second downlink reference signal; The random access resource is a PRACH opportunity, and the determining unit determines the next available PRACH opportunity from the consecutive PRACH opportunities.

2. The apparatus according to claim 1, wherein, The device further includes: The setting unit sets a random access preamble based on the value of modulo(A,Q) associated with the first downlink reference signal and the second downlink reference signal.

3. The apparatus according to claim 2, wherein, The setting unit sets the index of the random access preamble to a random access preamble index (ra-PreambleIndex) corresponding to the value of modulo(A,Q).

4. The apparatus according to claim 2, wherein, The device further includes: The second selection unit selects a random access preamble based on the value of modulo(A,Q) associated with the first downlink reference signal and the second downlink reference signal; The setting unit sets the index of the random access preamble to the index of the random access preamble selected by the second selection unit.

5. The apparatus according to claim 1, wherein, The first downlink reference signal and the second downlink reference signal satisfy at least one of the following conditions: The RSRP of the first downlink reference signal is greater than the threshold; The RSRP of the second downlink reference signal is greater than the threshold; The first downlink reference signal is included in a list of candidate beam reference signals for configuring beam failure recovery; The second downlink reference signal is included in the list of candidate beam reference signals for configuring beam failure recovery; The first downlink reference signal is indicated by the network device through downlink control information; The second downlink reference signal is indicated by the network device through downlink control information; The non-contention-based random access resource associated with the first downlink reference signal is indicated by the random access channel-specific configuration information; The non-contention-based random access resources associated with the second downlink reference signal are indicated by the random access channel-specific configuration information; The first downlink reference signal is not configured with non-contention-based random access resources or the first downlink reference signal is used for a contention-based random access preamble selection process; The second downlink reference signal is not configured with non-contention-based random access resources or is used for a contention-based random access preamble selection process.

6. The apparatus according to claim 1, wherein, The consecutive PRACH opportunities refer to the PRACH opportunities corresponding to the first downlink reference signal, or the PRACH opportunities corresponding to the second downlink reference signal, or the intersection of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal, or the union of the PRACH opportunities corresponding to the first downlink reference signal and the PRACH opportunities corresponding to the second downlink reference signal.

7. The apparatus according to claim 1, wherein, The device further includes: If the downlink reference signal selected by the first selection unit has a QCL relationship with the third downlink reference signal, the processing unit increments the power boost correlation counter by 1. The third downlink reference signal is the downlink reference signal selected during the last random access preamble transmission.

8. The apparatus according to claim 7, wherein, The downlink reference signal selected by the first selection unit is SSB, and the third downlink reference signal is SSB. The downlink reference signal SSB selected by the first selection unit and the third downlink reference signal SSB have a QCL relationship.

9. A configuration device configured in a network device, wherein, The device includes: A transmitting unit that transmits first configuration information to a terminal device, the first configuration information including one or more configurations, the configurations including configurations associated with a first downlink reference signal and a second downlink reference signal; The receiving unit receives a set of random access preambles based on the first downlink reference signal and the second downlink reference signal; The first downlink reference signal is associated with a first value of modulo(A,Q), and the second downlink reference signal is associated with a second value of modulo(A,Q). When the first downlink reference signal and the second downlink reference signal have a QCL relationship, the first downlink reference signal and the second downlink reference signal are selected according to the first value and the second value of modulo(A,Q). Wherein, A is the sequence index of the Physical Broadcast Channel Downlink Demodulation Reference Signal (PBCH DMRS), and Q is a parameter or setpoint configured by the network device.

10. The apparatus according to claim 9, wherein, The first configuration information is the beam failure recovery configuration information element.

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