System access method

Abstract

The embodiment of the invention provides a system access method and device, and the method comprises the steps: determining a to-be-accessed target system, and the target system comprises at least one of a first system and a second system; the target system is accessed through a random access channel (RACH) process, the problem of how to access the system in a multi-system coexistence scene in related technologies can be solved, system access is performed through the RACH process, the system overhead is reduced, energy conservation of a terminal and a network side can be further realized, and unified network management is realized.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and more specifically, to a system access method. Background Technology

[0002] Fifth-generation (5G) mobile communication technology, or even the next generation (6G), faces increasing demands. Current development trends indicate that 5G systems are evolving based on features such as enhanced mobile broadband, ultra-reliable low-latency communication, and massive machine-type communication. A key challenge is how to achieve system integration in scenarios where two or more systems coexist.

[0003] No solution has yet been proposed for the problem of how to access systems in scenarios where multiple systems coexist in related technologies. Summary of the Invention

[0004] This application provides a system access method to at least solve the problem of how to access a system in a multi-system coexistence scenario in related technologies.

[0005] According to one embodiment of this application, a system access method is provided, applied to a user equipment (UE), the method comprising:

[0006] The target system to be accessed is determined, wherein the target system includes at least one of the following: a first system and a second system;

[0007] Access to the target system is achieved through a Random Access Channel (RACH) procedure.

[0008] According to another embodiment of this application, a system access method is also provided, applied to a base station, the method comprising:

[0009] The target system to be accessed is determined, wherein the target system includes at least one of the following: a first system and a second system, wherein the target system is the system that the UE accesses through the random access channel RACH procedure.

[0010] According to another embodiment of this application, a system access device is also provided, applied to a user equipment (UE), the device comprising:

[0011] The first determining module is used to determine the target system to be accessed, wherein the target system includes at least one of the following: a first system and a second system;

[0012] The access module is used to access the target system via the Random Access Channel (RACH) procedure.

[0013] According to another embodiment of this application, a system access device is also provided, applied to a base station, the device comprising:

[0014] The second determining module is used to determine the target system to be accessed, wherein the target system includes at least one of the following: a first system and a second system, and the target system is a system accessed by the UE through the random access channel RACH procedure.

[0015] According to yet another embodiment of this application, a computer program product is also provided, including computer program instructions, wherein the computer program instructions cause a computer to implement the steps in any of the above method embodiments.

[0016] According to yet another embodiment of this application, a computer-readable storage medium is also provided, wherein a computer program is stored therein, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

[0017] According to yet another embodiment of this application, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0018] In this embodiment of the application, a target system to be accessed is determined, wherein the target system is a first system and / or a second system; accessing the target system through the Random Access Channel (RACH) procedure can solve the problem of how to access the system in a multi-system coexistence scenario in related technologies. System access through the RACH procedure reduces system overhead and can further achieve energy saving on the terminal and network sides, and realize unified network management. Attached Figure Description

[0019] Figure 1 This is a hardware structure block diagram of a computer device for the system access method according to an embodiment of this application;

[0020] Figure 2 This is a flowchart of a system access method according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the SSB to R0 mapping based on relevant technologies;

[0022] Figure 4 This is a flowchart of the system access method according to an embodiment of this application. Figure 1 ;

[0023] Figure 5 This is a flowchart of the system access method according to an embodiment of this application. Figure 2 ;

[0024] Figure 6 This is a schematic diagram illustrating the selection of PRACH configuration information between a 5G system and a 6G system according to an embodiment of this application.

[0025] Figure 7 This is a schematic diagram of cell configuration for accessing 5G and 6G systems according to embodiments of this application;

[0026] Figure 8 This is a frame of a system access device according to an embodiment of this application. Figure 1 ;

[0027] Figure 9 This is a frame of a system access device according to an embodiment of this application. Figure 2 . Detailed Implementation

[0028] The embodiments of this application will be described in detail below with reference to the accompanying drawings and examples.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] The methods and embodiments provided in this application can be executed in a computer device or similar computing device. Taking running on a computer device as an example, Figure 1 This is a hardware structure block diagram of the computer device for the system access method according to an embodiment of this application, such as... Figure 1 As shown, a computer device may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor (MCU) or programmable logic device, etc.) and a memory 104 for storing data are also shown. The computer device may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the computer device described above. For example, the computer device may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0031] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the system access method in this embodiment. The processor 102 executes various functional applications and single-board matching by running the computer program stored in the memory 104, thus implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to computer devices via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0032] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider for the computer equipment. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0033] In related technologies, the initial access process mainly includes the following two steps:

[0034] Cell search process: During this process, the terminal performs a cell search and, upon finding a suitable cell, performs downlink synchronization. The terminal detects the Primary Synchronization Signal / Secondary Synchronization Signal (PSS / SSS) to determine the cell ID and downlink frame boundary alignment. Then, by detecting the PBCH, it obtains the MIB, thus acquiring the system frame number and half-frame indication, thereby completing radio frame timing and half-frame timing. Simultaneously, the terminal uses the SSB index in the MIB message and the pattern of the synchronization broadcast block set used in the current frequency band to determine the time slot and symbol of the current synchronization signal, thereby completing time slot timing. In NR, PSS, SSS, and MIB are contained within the SSB.

[0035] Uplink synchronization process: The terminal completes uplink synchronization with the base station through a random access process.

[0036] During cell search, the UE has already acquired the Master Information Block (MIB) message. Based on the configuration of CORESET0 in the MIB, it further performs blind detection of DCI 1_0 (Downlink Control Information) and then receives the Physical Downlink Shared Channel (PDSCH) to obtain system information, including SIB1 (System Information Block) and other SIB messages. The RACH parameter configuration information during random access is configured through SIB1. In 5G NR systems, to save energy and reduce system information transmission overhead, other system information (OSI) besides MIB / SIB1 no longer needs to be broadcast periodically as in LTE. Instead, it can be triggered by the terminal's request to broadcast specific types of SI, hence the term on-demand SI. OSI requests can be triggered through the Physical Random Access Channel (PRACH), Msg.3, or WUS signals.

[0037] The RACH parameter configuration information includes a set of parameters, which can be found in protocol 38.331. These parameters may include: PRACH configuration index, PRACH configuration period, Preamble format, Msg1 time-domain information, number of frequency division R0 (RACHOccasion) opportunities for Msg1, Msg1 frequency domain start position, zero autocorrelation configuration, preamble target received power, PRACH power boost step size, maximum number of random access preamble transmissions, Random Access Response (RAR window size), Msg1 subcarrier spacing, Msg3 transmission precoding enable flag, number of preambles used for contention-based random access in Group A, PRACH root sequence index, contention resolution timer initial value, Msg3 transport block size threshold, SSB selection reference signal received power (RSRP) threshold, and supplementary uplink carrier (Supplementary...). Uplink (SUL) selects the RSRP threshold for SSB selection, the total number of preambles for random user access, the SSB-R0 association relationship, and the number of contention-based preamble sequences for each SSB, and configures the constraint set.

[0038] Because NR systems are designed to support carrier frequencies from 0 to 100 GHz, they use beamforming technology to improve cell coverage. However, due to hardware limitations, base stations often cannot simultaneously transmit all beams covering the entire cell; therefore, NR systems use beam scanning technology to address this issue. Figure 2 This is a schematic diagram based on the set of synchronous broadcast blocks in related technologies, such as... Figure 2 As shown, each synchronization broadcast block in beam scanning corresponds to a beam direction. The base station transmits only one or a few beam directions at a given time, covering all beam directions needed to cover the entire cell through transmission over multiple time periods. The synchronization broadcast block set (i.e., Synchronization Signal / PBCH Block set (Physical Broadcast Channel), or SS burst set) is designed for beam scanning and is used to transmit synchronization broadcast blocks in beam directions at multiple time periods. The maximum number of SSBs that can be transmitted in a single cell in NR can be 4, 8, or 64.

[0039] The UE searches for and obtains the optimal transmit beam and the optimal receive beam pair of the gNB. This step needs to be completed before the random access procedure begins. The UE determines a gNB whose reception quality meets the reception threshold by measuring the beam of the SSB or CSI-RS and sends the SSB or CSI-RS. Based on the association relationship configured in the gNB, the terminal selects a subset of random access resources or a subset of random access preamble indexes according to this SSB or CSI-RS and sends Msg1. The gNB detects the random access Msg1. Since the gNB and UE may not have beam complementarity, the downlink confirmed gNB transmit beam and UE receive beam cannot be directly used as the gNB receive beam and UE transmit beam. Both the gNB and UE need to perform uplink beam scanning to obtain the gNB receive beam and the UE transmit beam.

[0040] The configuration of the SSB-R0 association is a core feature of the NR random access procedure. The UE obtains two configuration parameters through the higher-layer parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB. The first parameter, ssb-perRACH-Occasion, is N, such as... Figure 3As shown, this represents the number of SSBs associated with each RACH opportunity; the second parameter, CB-PreamblesPerSSB, is R, representing the number of competitive leader sequences corresponding to each SSB. If N < 1, then 1 SSB is associated with 1 / N consecutive RACH opportunities, and the index range of the R PRACH leaders on each SSB is [0, R]. If N ≥ 1, then N SSBs are associated with one RACH opportunity, 0 ≤ n ≤ N-1, and the index range of the R PRACH leaders associated with each SSB is [0, R]. in This is given by the higher-level parameter totalNumberOfRA-Preambles and must be an integer multiple of N. Figure 3 This is a schematic diagram of the SSB to R0 mapping based on relevant technologies, such as... Figure 3 As shown, in order to accommodate all UEs in the network, the current NR standard assigns the same mapping relationship between all SSBs and R0 within a cell.

[0041] In LTE and NR Release 15, a four-step RACH process was used for uplink random access for both the terminal and the base station in contention-based random access scenarios. While this four-step RACH process ensured high access reliability, it was not optimal in terms of access efficiency due to the requirement of two interactions between the user and the base station. To address latency issues, NR Release 16 introduced a two-step RACH random access process. By merging the two uplink channels Msg1 and Msg3 into a new MsgA, and merging the two downlink channels Msg2 and Msg4 into a new MsgB, the entire RACH process was simplified to just two steps. Two-step RACH can significantly reduce latency, signaling overhead, and power consumption during random access, but it also introduces some additional problems. For example, the control information required for user access carried by Msg3 originally had its Physical Uplink Shared Channel (PUSCH) resources scheduled based on the Msg2 allocated by the base station. Therefore, users choosing different preamble resources could be assigned to orthogonal PUSCH resources for Msg3 transmission. However, for two-step RACH, there is no base station scheduling information before transmitting MsgA, so the entire MsgA transmission is contention-based, including the MsgA PRACH carrying preamble information and the MsgAPUSCH carrying control information. In particular, for the demodulation problem of MsgAPUSCH, the following two solutions are implicitly adopted in the protocol: one is to trade resources for efficiency, that is, when pre-allocating MsgA resources, different preamble sequences will be mapped to different PUSCH resources, which can ensure that the PUSCH transmission of users choosing different preambles is orthogonal. Another approach allows users to reuse data in a non-orthogonal manner, similar to Non-Orthogonal Multiplex Access (NOMA). By using low-rate processing at the transmitter and iterative interference cancellation techniques at the receiver, transmission performance can be guaranteed without increasing resource overhead.

[0042] Additionally, terminals can be configured with either 4-step RACH or 2-step RACH, or both access methods can be configured. Since the terminal is configured with both 4-step and 2-step RACH, it uses the RSRP threshold to determine whether to use 4-step or 2-step RACH. The NR standard's initial access process does not yet offer a solution for multi-system access in shared SSB scenarios.

[0043] To address the aforementioned issues, this embodiment provides a system access method for the aforementioned computer device. Figure 4 This is a flowchart of the system access method according to an embodiment of this application. Figure 1,like Figure 4 As shown, this process, applied to User Equipment (UE), includes the following steps:

[0044] Step S402: Determine the target system to be accessed, which includes at least one of the following: a first system and a second system;

[0045] Step S404: Access the target system via the RACH process.

[0046] In this embodiment of the application, step S404 may specifically include at least one of the following:

[0047] S4041, when the target system is the first system or the second system, access the first system or the second system based on the PRACH configuration information corresponding to the target system;

[0048] S4042, when the target system is a first system and a second system, access the first system and the second system simultaneously.

[0049] Through the above steps S402 to S404, the problem of how to access the system in the scenario of multiple systems coexisting in related technologies can be solved. By accessing the system through the RACH process, the system overhead is reduced, and energy saving on the terminal and network sides can be further achieved, realizing unified network management.

[0050] In this application embodiment, the first system and the second system can be at least one of the following: a 5G wireless communication system, a 6G wireless communication system, or other evolved wireless communication systems; and the first system is different from the second system.

[0051] In this application embodiment, there are multiple ways to determine the target system, mainly classified into two categories: one is that the base station determines the target system and then notifies the UE, and the other is that the UE determines the target system and then feeds back to the base station. The above step S202 can specifically include at least one of the following methods: determining the target system and feeding back the determined target system to the base station through a first message, that is, feeding back through the first message between the UE and the base station. Specifically, it can include at least one of the methods one and three; receiving a second message sent by the base station after determining the target system and determining the target system based on the second message, that is, determining it through the second message between the UE and the base station. Specifically, it can include at least one of the following methods two and four.

[0052] Method 1: The target system is determined based on the reference signal received power (RSRP) measured by the synchronization information block (SSB). The determined target system is fed back to the base station via Msg1 and / or MsgA. That is, the target system is determined by the UE based on the reference signal received power measured by the SSB and then fed back to the base station.

[0053] For Method 1, based on a shared SSB across multiple systems or predefined rules, the UE can access either the first or second system. System messages configure the parameters for the first and second systems, and the RACH procedure is used to select which system to access. Here, the shared SSB refers to an SSB used by multiple systems.

[0054] The terminal autonomously selects between the first and second systems for access via Msg1 / MsgA. System messages are sent to the first and second systems respectively to configure different PRACH configuration information, such as different R0 positions, and / or different sequence formats, and / or different preamble packets. Based on the RSRP measured by the downlink signaling channel (SSB), the UE determines which system to access through a threshold and then selects the corresponding PRACH configuration information for uplink random access.

[0055] Furthermore, the first system and the second system share PRACH configuration information. For example, when the PRACH configuration information includes a random access preamble sequence, and the random access preamble sequence associated with each shared SSB on the corresponding R0 is in the range of [R1, R2], the first system and the second system can share all PRACH configuration information or at least share a portion of the PRACH configuration information. A simple illustration shows that a partial random access preamble sequence [R1, floor((R2-R1+1) / 2)] can be used for uplink random access to the first system, and a random access preamble sequence [floor((R2-R1+1) / 2)+1, R2] can be used for uplink random access to the second system. Alternatively, only a portion of the random access preamble sequence can be shared. For example, a random access preamble sequence [R1, floor((R2-R1+1) / 3)] can be used for uplink random access to the first system, and a random access preamble sequence [floor((R2-R1+1) / 3)+1, floor((R2-R1+1)*2 / 3)] can be used for uplink random access to the second system. Other random access preamble sequences can be used for simultaneous uplink random access to the first and second systems.

[0056] Method 2: Receive Msg2 and / or MsgB sent by the base station, and determine the target system based on the notification of Msg2 and / or MsgB. That is, it is determined by the base station. The UE determines the target system based on the Msg2 and / or MsgB notified by the base station.

[0057] The selection is made using Msg2 and / or MsgB. After the UE sends PRACH, the base station uses Msg2 and / or MsgB to inform the UE whether it is being served by the first system or the second system. This can be divided into two scenarios.

[0058] If the system message only has one set of PRACH configuration information, meaning the first and second systems share Msg1, then the base station responds with an Msg2. One approach is to inform the UE of which system is serving it through the RA-RNTI configuration, for example, by introducing rat_id, where 0 represents the first system and 1 represents the second system. Another approach is to inform the UE of which system is serving it through the content of Msg2 and / or MsgB.

[0059] If the system message configures two sets of PRACH configuration information for the first system and the second system respectively, that is, the first system and the second system send Msg1 respectively, the base station can respond to Msg2 and / or MsgB of the first system and the second system respectively, or it can respond to only one of them. In this case, two Msg2 windows need to be introduced for the reception of Msg2 of the first system and the second system respectively. If two Msg2 responses are made or the two Msg2 windows have an overlapping area, and Msg2 and / or MsgB are detected in the overlapping area, then further differentiation can be made by the content of Msg2 and / or MsgB.

[0060] Method 3: The target system is determined based on the first preset rule, and the determined target system is fed back to the base station through Msg3 and / or MsgA. That is, the UE first determines the target system based on the first preset rule, and then feeds it back to the base station through Msg3 and / or MsgA.

[0061] That is, selection is made through Msg3 and / or MsgA. If the first system or the second system only responds to Msg2 and does not indicate the first system or the second system in Msg2, or if both systems respond to Msg2 and do not indicate the first system or the second system in Msg2, then the UE can further select one system (the first system or the second system) to access and provide feedback through Msg3 and / or MsgA.

[0062] The first preset rule can be the actual response of the first system and the second system, or it can be the channel conditions of the UE itself.

[0063] Method 4: Receive Msg4 and / or MsgB sent by the base station, determine the target system based on Msg4 and / or MsgB, that is, the base station determines the target system and then notifies the UE through Msg4 and / or MsgB, and the UE determines the target system based on Msg4 and / or MsgB.

[0064] That is, selection is made through Msg4 and / or MsgB, specifically to see which system resolves the conflict. If there is no conflict on either system, the user is notified through MSG4 and / or MSGB, for example, through the TC-RNTI method, such as introducing rat_id, where 0 represents the first system and 1 represents the second system.

[0065] For one of the above methods, determining the target system based on the RSRP measurement value measured by SSB may specifically include: determining whether the RSRP measurement value is greater than the RSRP threshold selected by SSB; if the determination result is yes, determining the target system as the first system; if the determination result is no, determining the target system as the second system.

[0066] In step S4042 above, the access to the first system and the second system can be simultaneous or sequential, and can specifically include at least one of the following:

[0067] Based on the shared SSB between the first and second systems, the UE can access the first and second systems in a preset order. That is, based on the shared SSB, the UE can first access one system, such as the first system, and then access the second system.

[0068] Based on the PRACH configuration information shared between the first and second systems, the UE can access both the first and second systems simultaneously. That is, based on the shared SSB, the UE can access both the first and second systems at the same time. For example, by using the PRACH configuration information shared between the first and second systems, the UE can simultaneously complete the access to both systems.

[0069] Furthermore, based on the SSB shared by the first system and the second system, accessing the first system and the second system in a preset order includes at least one of the following:

[0070] The system accesses the first system based on the SSB shared by the first system and the second system, configures the system parameters of the second system through system messages, and accesses the second system based on the system parameters of the second system.

[0071] Access to the first system is based on the SSB shared by the first system and the second system, the cell of the second system is configured through system messages, and access to the second system is based on the cell of the second system.

[0072] In one embodiment, the method further includes: configuring corresponding PRACH configuration information for the first system and the second system via system messages. Specifically, this can be understood as different systems corresponding to different PRACH configuration information. For example, different PRACH configuration information could refer to different PRACH preamble formats, different Msgl frequency domain start positions, different Msgl time domain information, different SSB-R0 association relationships, and different numbers of contention-based preamble sequences for each SSB. Of course, different combinations of these parameters can also represent different PRACH parameter configuration information.

[0073] Furthermore, shared PRACH configuration information is configured for the first and second systems via system messages. That is, the first and second systems are configured separately in different locations within the same PRACH configuration information.

[0074] The PRACH configuration information in this application embodiment includes at least one of the following: PRACH configuration index, PRACH configuration period, Preamble format, Msg1 time domain information, number of frequency division random access opportunities (ROs) for Msg1, Msg1 frequency domain start position, zero autocorrelation configuration, RAR window length, Msg1 subcarrier spacing, number of preambles used for contention-based random access in Group A, PRACH root sequence index, SSB selection RSRP threshold, SSB selection RSRP threshold on auxiliary uplink carrier SUL, total number of preambles for user random access, SSB-R0 association relationship and the number of contention-based preamble sequences corresponding to each SSB, constraint set configuration, Msg1 retransmission identifier, number of Msg1 retransmissions, and Subband Full Duplex (SBFD) RACH configuration.

[0075] This application also provides a system access method. Figure 5 This is a flowchart of the system access method according to an embodiment of this application. Figure 2 ,like Figure 5 As shown, applied to a base station, the method includes:

[0076] Step S502: Determine the target system to be accessed. The target system includes at least one of the following: a first system and a second system. The target system is the system that the UE accesses through the RACH procedure.

[0077] In this application embodiment, there are multiple ways to determine the target system, mainly classified into two categories: one is that the UE determines the target system and then feeds it back to the base station, and the other is that the base station determines the target system and then notifies the UE. The above step S502 may specifically include at least one of the following methods: receiving a first message sent by the UE after determining the target system, and determining the target system based on the first message. Specifically, it may include at least one of the methods one and three; determining the target system and notifying the UE of the determined target system through a second message. Specifically, it may include at least one of the methods two and four.

[0078] Method 1: Receive Msgl and / or MsgA sent by the UE, and obtain the target system determined by the RSRP measurement value measured by the UE based on the SSB through Msgl and / or MsgA. That is, it is determined by the reference signal measured by the UE based on the SSB. Then feed it back to the base station, and the base station determines the target system based on the feedback from the UE.

[0079] Method 2: Based on the second preset rule, the target system is determined, and Msg2 and / or MsgB are sent to the UE. The target system is notified to the UE through Msg2 and / or MsgB. That is, it is determined by the base station, and after determination, the UE is notified based on Msg2 and / or MsgB.

[0080] Method 3: Receive Msg3 and / or MsgA from the UE, and learn the target system determined by the UE based on the first preset rule through Msg3 and / or MsgA. That is, the UE determines the target system and then feeds it back to the base station through Msg3 and / or MsgA. The base station determines the target system based on Msg3 and / or MsgA.

[0081] Method 4: Based on the third preset rule, the target system is determined, and Msg4 and / or MsgB are sent to the UE. The target system is notified to the UE through Msg4 and / or MsgB. That is, the base station determines the target system and then notifies the UE through Msg4 and / or MsgB. The third preset rule can be the same as or different from the second preset rule, and can be determined according to the actual situation.

[0082] The following example illustrates the embodiments of this application, using the first system as a 5G system and the second system as a 6G system.

[0083] In this embodiment of the application, 5G / 6G system access is achieved through the RACH process, which further reduces system overhead.

[0084] In one embodiment, based on a shared SSB or predefined rules, the UE can access either a 5G or 6G system. System messages configure 5G and 6G system parameters, and the 5G / 6G system selection access is performed through the RACH procedure. Specifically, this can include the following schemes one to four, corresponding to the methods one to four described above.

[0085] Option 1: Selection via Msg1 and / or MsgA: The terminal autonomously selects the 5G / 6G system for access. System messages are sent to the 5G / 6G systems to configure different PRACH configuration information, such as different R0 locations, different sequence formats, and different preamble packets. The UE determines which system to access based on the RSRP measured by the downlink signaling channel (SSB) and uses an RSRP threshold, then selects the corresponding PRACH configuration information for uplink random access.

[0086] Furthermore, PRACH configuration information can be further divided into at least one of the following categories: PRACH configuration information independent of the 5G system, PRACH configuration information independent of the 6G system, and PRACH configuration information shared by the 5G system and the 6G system.

[0087] Furthermore, the PRACH configuration information includes at least one of the following: PRACH configuration index, PRACH configuration period, Preamble format, Msg1 time domain information, number of frequency division R0s of Msg1, Msg1 frequency domain start position, zero autocorrelation configuration, RAR window length, Msg1 subcarrier spacing, number of preambles used for contention-based random access in Group A, PRACH root sequence index, SSB selection RSRP threshold, SSB selection RSRP threshold on SUL, total number of preambles for user random access, SSB-R0 association and the number of contention-based preamble sequences corresponding to each SSB, constraint set configuration, Msg1 retransmission identifier, number of Msg1 retransmissions, and SBFD RACH configuration.

[0088] For example, different RACH configuration information could refer to different PRACH preamble formats, different Msg1 frequency domain start positions, different Msg1 time domain information, different SSB-R0 association relationships, and different numbers of contention-based preamble sequences for each SSB. Of course, different combinations of these parameters can also represent different RACH parameter configuration information.

[0089] Furthermore, the first and second systems share PRACH configuration information. For example, when the PRACH configuration information includes a random access preamble sequence, and the random access preamble sequence associated with each shared SSB on the corresponding R0 ranges from [R1, R2], for instance, the random access preamble sequence [R1, floor((R2-R1+1) / 2)] can be used for 5G system uplink random access, and the random access preamble sequence [floor((R2-R1+1) / 2)+1, R1, floor((R2-R1+1) / 2)+ ... For uplink random access to the 6G system, only a portion of the random access preamble sequence can be shared. For example, the random access preamble sequence [R1, floor((R2-R1+1) / 3)] can be used for uplink random access to the 5G system, and the random access preamble sequence [floor((R2-R1+1) / 3)+1, floor((R2-R1+1)*2 / 3)] can be used for uplink random access to the 6G system. Other random access preamble sequences can be used for simultaneous access by the 5G and 6G systems.

[0090] Furthermore, the UE can determine the RSRP measurement value of the DL signal (SSB or CSI-RS) and thus select different sets of RACH parameter configuration information to send. Figure 6 This is a schematic diagram illustrating the selection of PRACH configuration information between the 5G system and the 6G system according to embodiments of this application, such as... Figure 6As shown, if the RSRP measurement value is higher than the RSRP threshold, the 6G PRACH configuration information is selected; otherwise, the 5G PRACH configuration information is selected. The RSRP threshold can be a newly added threshold parameter.

[0091] Option 2: Selection via Msg2 and / or MsgB: After the UE sends PRACH, the base station informs the UE whether it is being served by a 5G or 6G system via RAR. This can be divided into two scenarios.

[0092] There is only one set of PRACH configuration information, meaning that 5G and 6G systems share Msg1. In this case, the base station responds with a RAR. One way to do this is to inform the UE which system is serving it through the RA-RNTI configuration, for example, by introducing rat_id, where 0 represents the 5G system and 1 represents the 6G system. The RA-RNTI formula for 5G NR can be improved, although the formula for 6G system RA-RNTI may change. Here, we only emphasize the consideration of introducing RAT. Based on the detection of the corresponding Physical Downlink Control Channel (PDCCH) using RA-RNTI, the system information of the base station serving the terminal can be confirmed. The improved formula is:

[0093] RA-RNTI=1+s-id+14×t-id+14×80×f-id+14×80×8×ul_carrier-id+14×80×8×2×rat_id.

[0094] Among them, s-id: the index of the first OFDM symbol of the specified PRACH (0<=s-id<14);

[0095] t-id: the index of the first slot symbol of the specified PRACH in asystem frame (0<=t_id<80);

[0096] f-id: the index of the specified PRACH in the frequency domain (0<=s-id<8);

[0097] ul-carrier-id: UL carrier used for Msg1 transmission (0=normal carrier, 1=SUL carrier);

[0098] rat-id: Rat used for Msg1 transmission (0=5G NR, 1=6G RAT).

[0099] Another approach is to inform the UE of which system is serving it through RAR content, for example, by using a 1-bit indication. This can be achieved using the R (reserved) bit indication, or by configuring TC-RNTI in the same way as RA-RNTI, or by reusing UL Grant content, such as using a 1-bit frequency hopping identifier or a 1-bit CSI request to indicate whether it is a 5G or 6G system.

[0100] 5G / 6G systems are configured with two sets of PRACH configuration information, meaning the 5G and 6G systems each send Msg1. The base station can respond to the RAR separately, or only one of them. Therefore, two RAR windows are needed for RAR reception by the 5G and 6G systems respectively. If two RAR responses are received, or if the two RAR windows overlap and a RAR is detected in the overlapping area, further differentiation can be achieved through the RAR content. For example, differentiation can be made using the random access preamble identifier (RAR).

[0101] Option 3: Selection via Msg3 and / or MsgA: If the 5G system or the 6G system only responds to one RAR (Msg2) and does not indicate whether it is a 5G or 6G system in the RAR, or if both systems respond to the RAR and do not indicate whether they are a 5G or 6G system in the RAR, then the UE can further select a system to access and provide feedback via Msg3 or MsgA. For example, it can confirm whether it is a 5G or 6G system by using 1 bit in the RRCSetupRequest message.

[0102] Option 4: Select via Msg4 and / or MsgB: This approach aims to determine which system resolves the conflict. If there is no conflict on either system, notify the user via MSG4 and / or MSGB, for example, using the TC-RNTI method. The specific method is the same as RA-RNTI, and further consideration should be given to introducing rat_id, for example, 0 for 5G system and 1 for 6G system.

[0103] Optionally, schemes one through four above can be combined. This allows for further differentiation of different energy-saving modes and can also be linked to SSB sharing. In other words, base stations can select energy-saving modes through dynamic or semi-static configuration. The more 5G / 6G sharing occurs (i.e., the higher the value), the lower the system overhead and the more significant the energy-saving effect. Base stations can modify the corresponding energy-saving mode based on factors such as UE capabilities, network deployment, and service peak characteristics. The selection method for 5G / 6G systems also changes accordingly. Specific energy-saving modes can include at least one of the following:

[0104] Mode 0: RACH procedures are not shared; for example, based on a shared SSB, the uplink random access procedures in 5G / 6G systems are independent. The UE can access the system based on Scheme 1.

[0105] Mode 1: 5G / 6G shared MSG1; for example, based on a shared SSB, MSG1 is shared during uplink random access in the 5G / 6G system, while MSG2, MSG3, and MSG4 are independent for the 5G / 6G system. The UE can access the system based on the above scheme 2.

[0106] Mode 2: 5G / 6G share MSG1 and MSG2; for example, based on a shared SSB, MSG1 and MSG2 are shared during uplink random access in the 5G / 6G system, while MSG3 and MSG4 are independent of the 5G / 6G system. The UE can access the system based on the above scheme 3.

[0107] Mode 3: 5G / 6G share MSG1, MSG2, and MSG3; for example, based on a shared SSB, MSG1, MSG2, and MSG3 are shared during uplink random access in the 5G / 6G system, while MSG4 is independent of the 5G / 6G system. The UE can access the system based on the above scheme four.

[0108] Mode 4: 5G / 6G share MSG1, MSG2, MSG3, and MSG4. For example, based on a shared SSB, the uplink random access procedure of the 5G / 6G system is shared, and the UE can access the 5G / 6G system simultaneously.

[0109] In another embodiment, based on a shared SSB, the UE can first access a system, such as a 5G system. Specifically, this includes:

[0110] The configuration of 6G parameters via system messages involves first accessing the 5G system and then the 6G system. Specifically, this includes:

[0111] Scenario 1: The shared SSB has completed downlink synchronization between the 5G and 6G systems, but the uplink synchronization between the 5G and 6G systems is inconsistent. A new 6G system random access needs to be initiated. The 6G random access parameters are configured through system messages and the 6G uplink random access is triggered.

[0112] Scenario 2: No need to initiate 6G random access. In this scenario, it is assumed that the SSB and RACH processes of the 5G and 6G systems are shared. In this case, a complete set of parameters of the 6G system connection state is obtained from the 5G system, such as Radio Resource Control (RRC) messages.

[0113] Access to the 5G system can be achieved first via a virtual CA, followed by access to the 6G system. For example, a 6G Scell ​​can be configured via system messages using CA carrier aggregation. Figure 7 This is a schematic diagram of cell configuration for accessing 5G and 6G systems according to embodiments of this application, as shown below. Figure 7 As shown, the 5G primary cell is also the 6G secondary cell, which can be configured via CA. Meanwhile, CC1 is the 6G primary cell used for independent 6G networking.

[0114] In another embodiment, based on a shared SSB, the UE can access 5G / 6G systems simultaneously. For example, by utilizing the Physical Random Access Channel (PRACH) configuration information shared by the 5G and 6G systems, 5G / 6G system access can be completed simultaneously.

[0115] The MIB indicates whether subsequent system messages indicate 5G or 6G parameters, for example:

[0116] MIB::=SEQUENCE{ ...

[0118] cellBarred ENUMERATED{5G-barred, 6G-barred, notBarred}.

[0119] This application also provides a system access device. Figure 8 This is a frame of a system access device according to an embodiment of this application. Figure 1 ,like Figure 8 As shown, the device is applied to a user equipment (UE) and includes:

[0120] The first determining module 82 is used to determine the target system to be accessed, wherein the target system includes at least one of the following: a first system and a second system;

[0121] Access module 84 is used to access the target system through the random access channel RACH procedure.

[0122] This application also provides a system access device. Figure 9 This is a frame of a system access device according to an embodiment of this application. Figure 2 ,like Figure 9 As shown, the device is applied to a base station and includes:

[0123] The second determining module 92 is used to determine the target system to be accessed, wherein the target system includes at least one of the following: a first system and a second system, and the target system is a system accessed by the UE through the random access channel RACH procedure.

[0124] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the methods described in various embodiments of this application.

[0125] This application also provides a computer program product, including a non-volatile computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the methods described in various embodiments of this application.

[0126] Embodiments of this application also provide a computer-readable storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when run.

[0127] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard disk, magnetic disk, or optical disk.

[0128] Embodiments of this application also provide an electronic device including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0129] In one exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0130] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0131] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this application is not limited to any particular combination of hardware and software.

[0132] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A system access method, characterized in that, Applied to a user equipment (UE), the method includes: The target system to be accessed is determined, wherein the target system includes at least one of the following: a first system and a second system; Access to the target system is achieved through the Random Access Channel (RACH) procedure.

2. The method according to claim 1, characterized in that, The target system to be accessed includes at least one of the following: The target system is determined, and the determined target system is fed back to the base station via a first message; The system receives a second message sent by the base station after determining the target system, and determines the target system based on the second message.

3. The method according to claim 2, characterized in that, The target system is determined, and the determined target system is fed back to the base station via a first message, including at least one of the following: The target system is determined based on the reference signal received power (RSRP) measured by the synchronization information block (SSB), and the determined target system is fed back to the base station via Msg1 and / or MsgA. The target system is determined based on the first preset rule, and the determined target system is fed back to the base station through Msg3 and / or MsgA.

4. The method according to claim 2, characterized in that, The receiver receives a second message sent by the base station after determining the target system, and the determination of the target system based on the second message includes at least one of the following: The system receives Msg2 and / or MsgB from the base station and determines the target system based on the notification of Msg2 and / or MsgB. The system receives Msg4 and / or MsgB from the base station and determines the target system based on the notification of Msg4 and / or MsgB.

5. The method according to claim 3, characterized in that, Determining the target system based on the Reference Signal Received Power (RSRP) measured by the Synchronization Block (SSB) includes: Determine whether the RSRP measurement value is greater than the RSRP threshold selected by the SSB; If the determination result is yes, the target system is determined to be the first system; If the determination result is negative, the target system is determined to be the second system.

6. The method according to claim 1, characterized in that, Accessing the target system via the Random Access Channel (RACH) procedure includes at least one of the following: When the target system is the first system or the second system, access is made to the first system or the second system based on the physical random access channel (PRACH) configuration information corresponding to the target system. If the target system is the first system and the second system, then access the first system and the second system.

7. The method according to claim 6, characterized in that, Access to the first system and the second system includes at least one of the following: Based on the SSB shared by the first system and the second system, the first system and the second system are connected in a preset order; The system can simultaneously access both the first system and the second system based on the PRACH configuration information shared by the first system and the second system.

8. The method according to claim 7, characterized in that, Based on the SSB shared by the first system and the second system, accessing the first system and the second system in a preset order includes at least one of the following: The system accesses the first system based on the SSB shared by the first system and the second system, configures the system parameters of the second system through system messages, and accesses the second system based on the system parameters of the second system. Access to the first system is based on the SSB shared by the first system and the second system, the cell of the second system is configured through system messages, and access to the second system is based on the cell of the second system.

9. The method according to claim 6, characterized in that, The method further includes: Configure the corresponding PRACH configuration information for the first system and the second system through system messages.

10. The method according to claim 9, characterized in that, The system messages used to configure the corresponding PRACH configuration information for the first system and the second system include: The system messages are used to configure shared PRACH configuration information for the first system and the second system.

11. The method according to claim 6, characterized in that, The PRACH configuration information includes at least one of the following: PRACH configuration index, PRACH configuration period, Preamble format, Msg1 time domain information, number of frequency division random access opportunities (R0) for Msg1, Msg1 frequency domain start position, zero autocorrelation configuration, RAR window length, Msg1 subcarrier spacing, number of preambles used for contention-based random access in Group A, PRACH root sequence index, SSB selection RSRP threshold, SSB selection RSRP threshold on auxiliary uplink carrier SUL, total number of preambles for user random access, SSB-R0 association relationship and the number of contention-based preamble sequences corresponding to each SSB, constraint set configuration, Msg1 retransmission identifier, number of Msg1 retransmissions, and subband full-duplex SBFD RACH configuration.

12. A system access method, characterized in that, Applied to a base station, the method includes: The target system to be accessed is determined, wherein the target system includes at least one of the following: a first system and a second system, wherein the target system is the system that the UE accesses through the random access channel RACH procedure.

13. The method according to claim 12, characterized in that, The target system to be accessed includes at least one of the following: Receive a first message sent by the UE after determining the target system, and determine the target system based on the first message; The target system is identified, and the identified target system is notified to the UE via a second message.

14. The method according to claim 13, characterized in that, The system receives a first message sent by the UE after determining the target system, and the target system is determined based on the first message to include at least one of the following: Receive Msg1 and / or MsgA sent by the UE, and obtain the target system determined by the UE based on the reference signal received power (RSRP) measured by the synchronization information block (SSB) through Msg1 and / or MsgA; The system receives Msg3 and / or MsgA from the UE and learns the target system determined by the UE based on the first preset rule through Msg3 and / or MsgA.

15. The method according to claim 13, characterized in that, The target system is determined, and the UE is notified via a second message that the determined target system includes at least one of the following: The target system is determined based on the second preset rule, and the target system is notified to the UE through Msg2 and / or MsgB. The target system is determined based on a third preset rule, and the target system is notified to the UE via Msg4 and / or MsgB.

16. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the method described in any one of claims 1 to 11, 12 to 15 when it is run.

17. An electronic device, characterized in that, The method includes a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the method according to any one of claims 1 to 11, 12 to 15.

18. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 1 to 11, 12 to 15.

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