Cell access method, device, equipment and storage medium

Abstract

The present application provides a cell access method, apparatus, device and storage medium, the method being applied to a first node, comprising: receiving a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization of the first communication node with the first cell, the first system information carries first resource indication information, and the first resource indication information at least includes an indication of resources required for sending a first application signal; sending a first application signal, wherein the first application signal is used to request the second node to send first information; receiving first information, wherein the first information is used to indicate that the first node accesses the second cell based on the first information.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a cell access method, apparatus, device and storage medium. Background Art

[0002] In a cell-free system, each UE has a cell centered on itself, and the cell moves with the UE during its movement, thereby minimizing the impact of inter-cell interference, frequent switching, etc. on the UE. In the existing cell-free technology, the UE needs to establish an RRC connection with a cell in the cellular form, and then switch the UE from the cellular system to the cell-free system.

[0003] The above method results in that when the UE accesses the system, it still faces serious inter-cell interference and needs to frequently perform cell selection / cell reselection. Summary of the invention

[0004] The method, apparatus, device and storage medium of the cell access method provided in the present application are used to reduce the impact of the cellular system on the corresponding cell.

[0005] In a first aspect, an embodiment of the present application provides a cell access method, the method being applied to a first node, comprising:

[0006] Receive a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information at least includes an indication of resources required to send a first application signal;

[0007] Sending a first application signal, wherein the first application signal is used to request the second node to send first information;

[0008] First information is received, where the first information is used to instruct the first node to access the second cell based on the first information.

[0009] In a second aspect, an embodiment of the present application provides a cell access method, the method being applied to a second node, including:

[0010] A first synchronization signal and first system information periodically sent in a first cell; wherein, the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending a first application signal;

[0011] receiving the first application signal; wherein the first application signal is used to request the second node to send first information;

[0012] Send first information, where the first information is used to instruct the first node to access the second cell based on the first information.

[0013] In a third aspect, an embodiment of the present application provides a cell access device, where the device is configured at a first node, including:

[0014] A first receiving module is configured to receive a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending a first application signal;

[0015] A first sending module is configured to send a first application signal, wherein the first application signal is used to request the second node to send first information;

[0016] The second receiving module is configured to receive first information, wherein the first information is used to instruct the first node to access the second cell based on the first information.

[0017] In a fourth aspect, an embodiment of the present application provides a cell access device, the device being configured at a second node, including:

[0018] A second sending module is configured to periodically send a first synchronization signal and first system information in a first cell; wherein, the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending the first application signal;

[0019] A third receiving module is configured to receive the first application signal; wherein the first application signal is used to request the second node to send the first information;

[0020] The third sending module is configured to send first information, wherein the first information is used to instruct the first node to access the second cell based on the first information.

[0021] In a fifth aspect, an embodiment of the present application provides a device, including:

[0022] one or more processors;

[0023] A memory for storing one or more programs;

[0024] When the one or more programs are executed by the one or more processors, the one or more processors implement any method provided in the embodiments of the present application.

[0025] In a sixth aspect, an embodiment of the present application provides a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the embodiments of the present application is implemented.

[0026] With regard to the above embodiments and other aspects of the present application and their implementation, further description is provided in the accompanying drawings, detailed description and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of a cell access method provided by an embodiment of the present application;

[0028] Figure 2 is a flow chart of a cell access method provided by an embodiment of the present application;

[0029] Figure 3 It is a flow chart of a method for applying for access to a cell with dual application signals provided in an embodiment of the present application;

[0030] Figure 4 It is a flow chart of a method for interactively applying for access to a cell with dual application signals provided in an embodiment of the present application;

[0031] Figure 5 It is a flow chart of a method for applying for access to a cell with dual application signals provided in an embodiment of the present application;

[0032] Figure 6 This is a flow chart of a method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0033] Figure 7 It is a flowchart of another method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0034] Figure 8 It is a flowchart of another method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0035] Fig. 9 It is a flowchart of another method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0036] Fig.10 It is a flowchart of another method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0037] Fig.11 It is a flowchart of another method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0038] Fig.12 It is a flowchart of another method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0039] Fig.13 It is a flowchart of another method for applying for cell access with a single application signal provided in an embodiment of the present application;

[0040] Fig.14 It is a structural diagram of a cell access device provided in an embodiment of the present application;

[0041] Fig.15 It is a structural diagram of a cell access device provided in an embodiment of the present application;

[0042] Fig.16 It is a structural schematic diagram of a device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0044] The steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions. Also, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described can be performed in a sequence different from that shown here.

[0045] The cellular network architecture improves the utilization of spectrum resources and system capacity through frequency reuse and cell splitting technology, supporting the rapid development of mobile communications. In order to meet the continuously increasing traffic demand, the entire evolution of mobile communications from 1G to 5G is based on cellular networks, that is, the macro cell splitting and vertical micro cell network layering are adopted.

[0046] Cell splitting is the most effective way to increase the capacity of wireless systems. However, with the deployment of various low-power network nodes (LPNs) including microcells, small cells, home base stations and relay nodes in traditional cellular networks, cellular networks are becoming more and more heterogeneous and dense, resulting in a series of problems that reduce system capacity and user experience, such as severe interference between cells and frequent switching of UEs during mobility.

[0047] In response to the above problems, a cell-free system is proposed. In this system, a large number of access points (APs) equipped with one or more antennas are distributed in a large area, and data is transmitted to the central processing unit (CPU) through the fronthaul link, and the same time-frequency resources are used to serve multiple users. APs usually have only a small number of baseband functions, such as precoding, channel estimation, and radio frequency functions, while the CPU is responsible for scheduling, power control, and pilot allocation. In this system, each UE has a cell centered on itself, and the cell moves with the UE during movement, thereby minimizing the impact of inter-cell interference, frequent switching, etc. on the UE. Therefore, cell-free technology is a key technology to meet the future 6G needs.

[0048] However, in the existing cell-free related technologies, it is assumed that the UE can only work in the cell-free mode after the RRC connection has been established. Before that, the UE needs to establish an RRC connection with a cell in the cellular in the form of a cellular, and then switch the UE from the cellular system to the cell-free system. The defect of this method is that the cellular system and the cell-free system are systems designed based on two different design concepts. The former is centered on the base station, and the latter is centered on the UE. The existing technology pieces together two systems with different design concepts. When the UE accesses the system, it still faces serious inter-cell interference and the need for frequent cell selection / cell reselection. This mechanism may even become a bottleneck for the overall performance of the cell-free system. Therefore, the present application proposes a new method for accessing a cell-free system.

[0049] In one embodiment, a cell access method is provided, the method being applied to a first node, such as Figure 1 As shown, the cell access method provided in the embodiment of the present application mainly includes steps S11, S12 and S13.

[0050] S11. Receive a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information at least includes an indication of resources required to send a first application signal.

[0051] S12. Send a first application signal, wherein the first application signal is used to request the second node to send first information.

[0052] S13. Receive first information, where the first information is used to instruct the first node to access the second cell based on the first information.

[0053] In this embodiment, the first cell is a public cell, and the network system may include one or more public cells. The second cell can be understood as an exclusive cell of a certain UE. Furthermore, the first cell can be implemented by a traditionally deployed cellular base station, or by a distributed densely deployed AP (including a CPU responsible for managing these APs). The exclusive cell is usually implemented by a distributed densely deployed AP, which can be controlled by a traditional cellular base station. It can also be managed by a dedicated central processing unit CPU. When the AP is managed by the central processing unit CPU, there is an interface for mutual communication between the CPU and the cellular base station.

[0054] In an exemplary embodiment, the first application signal is sent in a first cell, or the first application signal is sent in a second cell.

[0055] In an exemplary embodiment, when the first application signal is sent within the first cell, the first application signal carries measurement result information of the first cell synchronization signal or location information of the UE.

[0056] In an exemplary implementation, when the first application signal is sent in the second cell, the first application signal carries a sequence preconfigured by the network.

[0057] In an exemplary embodiment, the receiving the first information includes: receiving a first response signal, wherein the first response signal is a response signal to the first application signal.

[0058] In an exemplary embodiment, the step of the first node accessing the second cell based on the first information includes:

[0059] receiving a second synchronization signal, where the second synchronization signal is used for downlink synchronization between the first node and the second cell;

[0060] receiving second system information, where the second system information carries second resource indication information, where the second resource indication information is used to indicate resources required for sending a second application signal;

[0061] Sending a second application signal, where the second application signal is used for uplink synchronization between the first node and the second cell;

[0062] A second response signal is received, wherein the second response signal carries information allowing the first communication node to access.

[0063] In an exemplary embodiment, the receiving the second synchronization signal includes:

[0064] A second synchronization signal is received at the frequency domain position of the second synchronization signal; wherein the frequency domain position of the second synchronization signal is determined by the frequency domain position information carried in the first information, or the frequency domain position of the second synchronization signal is determined by the frequency domain position of the first synchronization signal and a preset relationship.

[0065] In an exemplary embodiment, the step of the first node accessing the second cell based on the first information includes:

[0066] A first physical downlink control channel PDCCH receiving a first response signal;

[0067] Receiving a first response signal based on the first PDCCH, wherein the first response signal carries a cell identifier and uplink authorization information of the first cell;

[0068] Sending a third application signal on the resources determined by the uplink authorization information, wherein the third application signal carries information required for applying for the second cell;

[0069] A second PDCCH receiving a third response signal; the third response signal is a response signal to the third application signal;

[0070] A third response signal is received based on the second PDCCH, wherein the third response signal carries information allowing the first communication node to access.

[0071] In an exemplary embodiment, the receiving of the first physical downlink control channel PDCCH of the first response signal includes:

[0072] A first physical downlink control channel PDCCH of a first response signal is received in a first cell.

[0073] In an exemplary embodiment, the receiving the first response signal includes:

[0074] A first response signal is received in the first cell, or a first response signal is received in the second cell.

[0075] In an exemplary implementation, the first PDCCH is scrambled using a first radio network temporary identifier RNTI.

[0076] In an exemplary embodiment, the third application signal and the second PDCCH are scrambled using a second RNTI, wherein the first RNTI and the second RNTI are the same, or the first RNTI and the second RNTI are different.

[0077] In an exemplary embodiment, the first response signal carries two different first RNTIs and second RNTIs.

[0078] In an exemplary embodiment, the first response signal carries the first RNTI; the second RNTI is determined by the first RNTI and a cell identifier of the first cell; or, the first response signal carries the second RNTI; the first RNTI is determined by the second RNTI and a cell identifier of the first cell.

[0079] In one embodiment, a cell access method is provided, the method being applied to a second node, such as Figure 2 As shown, the cell access method provided in the embodiment of the present application mainly includes steps S21, S22 and S23.

[0080] S21, a first synchronization signal and first system information periodically sent in a first cell; wherein, the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending a first application signal;

[0081] S22. Receive the first application signal; wherein the first application signal is used to request the second node to send first information;

[0082] S23. Send first information, where the first information is used to instruct the first node to access the second cell based on the first information.

[0083] In an exemplary embodiment, when the first information is a first response signal, it includes: sending a second synchronization signal, the second synchronization signal is used for downlink synchronization of the first node and the second cell; sending second system information, the second system information carries second resource indication information, and the second resource indication information is used to indicate the resources required for sending a second application signal; receiving a second application signal, the second application signal is used for uplink synchronization of the first node and the second cell; sending a second response signal, the second response signal carries information allowing the first communication node to access.

[0084] In an exemplary embodiment, in the case where the first information is the first physical downlink control channel PDCCH of a first response signal, it includes: sending the first physical downlink control channel PDCCH of a first response signal; sending a first response signal, wherein the first response signal carries the cell identifier and uplink authorization information of the first cell; receiving a third application signal, wherein the third application signal carries the information required to apply for a second cell; sending a second PDCCH of a third response signal; the third response signal is a response signal of the third application signal; sending a third response signal, wherein the third response signal carries information allowing the first communication node to access.

[0085] In one embodiment, a method for applying for access to a cell using dual application signals is provided.

[0086] like Figure 3 As shown, on the UE side, the UE obtains the second cell through the following steps.

[0087] S31. The UE receives synchronization signals of one or more first cells. The UE can achieve downlink synchronization with at least one first cell by using the synchronization signals.

[0088] S32. The UE receives downlink synchronized system information of the first cell, where the system information carries at least indication information of the first resource required for applying for a second cell service.

[0089] S33. The UE determines the resources required to apply for the second cell according to the received system information of the first cell, and sends a first application signal on the resources.

[0090] Furthermore, the first application signal carries information related to the measurement result of the first cell synchronization signal, such as the strongest K first cell synchronization signal indexes, where the synchronization signal index is represented by the cell index PCI, the reference signal received power (RSRP) of the K synchronization signals or the reference signal received quality (RSRP) of the synchronization signals, etc.

[0091] The method for carrying the information related to the above measurement results may be implicit. For example, for different first cell synchronization signal index rankings / RSRP / RSRP, the network configures different sequences. The method for carrying the information related to the above measurement results may also be explicit. For different first cell synchronization signal index rankings / RSRP / RSRP, the network configures different PUSCHs.

[0092] The network receives the request signal (including the above measurement information) sent by the UE and can organize a suitable AP set to form a second cell to serve the UE according to the above measurement information, wherein the UE service includes sending a synchronization signal, response information, etc. to the target UE.

[0093] S34. The UE receives a first response signal sent by the first cell to the first application signal.

[0094] The response signal carries at least frequency domain location information of the second cell synchronization signal.

[0095] Furthermore, the response signal may also include a sequence used by the second cell synchronization signal. This sequence is also UE-specific. The UE can use the frequency domain location information of the second cell synchronization signal to not only speed up synchronization, but also avoid synchronizing with a second cell that is not intended to serve the UE.

[0096] S35. The UE receives the synchronization signal sent by the second cell to achieve synchronization with the second cell.

[0097] S36. The UE receives system information related to the second cell sent by the second cell.

[0098] The system information includes at least second resource indication information for accessing the second cell;

[0099] S37. The UE sends a second application signal on the resources determined in S36 to apply for the second cell.

[0100] S38. The UE receives a second response signal sent by the second cell.

[0101] If the second response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0102] Accordingly, on the network side, in order to assist the UE in applying for the second cell, the network mainly includes:

[0103] 1. Periodically send a synchronization signal of the first cell in the first cell.

[0104] Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0105] 2. Periodically send system information of the first cell in the first cell.

[0106] The system information carries at least indication information of first resources required for applying for second cell service, and the resources required for applying for second cell service are within the bandwidth of the first cell.

[0107] 3. Receive a first application signal for applying for a second cell at a preset time-frequency position.

[0108] 4. Send a first response signal to the first application signal in the first cell.

[0109] The first response signal carries at least frequency domain location information of the second cell synchronization signal.

[0110] Furthermore, the first response signal may also include one or more information such as the time offset between the second cell synchronization signal and the first cell synchronization signal, the bandwidth of the second cell, control resource set configuration information (resource set used to send PDCCH), etc.

[0111] 5. Send a synchronization signal in the second cell, where the synchronization signal is used for downlink synchronization between the aforementioned target UE and the second cell.

[0112] 6. Sending system information related to the cell in the second cell, where the system information at least includes second resource indication information for accessing the second cell;

[0113] 7. Receive a second application signal sent by the UE on the second cell.

[0114] 8. Send a second response signal to the second application signal in the second cell.

[0115] If the second signal response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0116] Further, with respect to single-transmission synchronization, the resources occupied by the synchronization signal sent by the second cell are smaller than those of the synchronization signal sent by the first cell, or the length of the synchronization signal sequence sent by the second cell is shorter than the length of the synchronization sequence sent by the first cell.

[0117] In this application, in addition to being used for downlink synchronization, the first cell is also used to distinguish different first cells. In order to minimize interference with adjacent cells, the synchronization signal of the first cell usually needs to use a relatively long sequence, which also means that more resources are required. The second cell is a cell dedicated to the UE, and its synchronization signal is also dedicated to the UE. Its main purpose is downlink synchronization, which usually requires fewer resources to achieve this purpose.

[0118] Furthermore, the first application signal sent by the UE in S33 and the second application signal sent by the UE in S37 are not completely the same.

[0119] The similarities are that both can achieve uplink synchronization and UE identification. The difference is that the first application signal sent in step 3 carries information related to the measurement results of the first cell synchronization signal, such as the K first cell synchronization signal indexes (K>=2) with the strongest reference signal received power (RSRP) of the synchronization signal or the reference signal received quality (RSRP) of the synchronization signal, and the specific values ​​of RSRP / RSRQ corresponding to these K synchronization signal indexes.

[0120] In this application, the first cell can be implemented by a traditional base station or a densely deployed AP. The base station or AP receives the request signal sent by the UE (including the above measurement information), and can request the CPU to organize a suitable AP set to form a second cell to serve the UE (including sending synchronization signals and response information for the target UE) based on the above measurement information. This mechanism is more suitable for situations where the uplink and downlink frequencies are different and the channel reciprocity is not accurate enough. There is no such requirement in S37, and the second application signal only needs to achieve uplink synchronization and UE identification.

[0121] Furthermore, S37 and S38 can be further divided into 4 steps. For example:

[0122] The UE sends an uplink synchronization application signal on the resource determined in S36 to apply for obtaining the second cell. The application signal is also used for uplink synchronization.

[0123] The UE receives a response signal sent by the second cell, where the response information includes at least uplink authorization information, which is used for the UE to further send information such as UE ID.

[0124] The UE sends the UE ID and other information required to apply for the second cell on the resources determined in the previous step.

[0125] Receive a response signal sent by the second cell.

[0126] If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0127] Further, it is assumed that the frequency domain position of the first application signal sent in S33 has a preset one-to-one correspondence or one-to-many relationship with the frequency domain position of the synchronization signal sent by the second cell. For example, the frequency domain position of the aforementioned first application signal is X, and the frequency domain position of the synchronization signal sent by the second cell is X+offset, where offset is a fixed value or one of several fixed values. In this case, sending or receiving a response signal in S34 can also be omitted and S35 can be directly executed.

[0128] In one embodiment, a method for applying for access to a cell with dual application signals is provided. Figure 4 As shown,

[0129] S41. The first cell sends a downlink synchronization signal to the UE.

[0130] S42: The first cell sends a system message of the first cell to the UE. The system message carries at least indication information of the first resource required for applying for the second cell service.

[0131] S43. The UE sends a first application signal for the second cell to the first cell.

[0132] S44. The first cell sends a first response signal to the UE in response to the first application signal.

[0133] S45. The UE receives a synchronization signal of the second cell sent by the second cell.

[0134] S46. The UE receives a system message of the second cell sent by the second cell.

[0135] S47. The second cell receives a second application signal sent by the UE.

[0136] S48. The second cell sends a second response signal to the second application signal to the UE.

[0137] In one embodiment, a method for applying for access to a cell using dual application signals is provided.

[0138] like Figure 5 As shown, on the UE side, the UE obtains the second cell through the following steps:

[0139] S51. UE receives synchronization signals of one or more first cells.

[0140] Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0141] S52. UE receives the synchronized system information of the first cell.

[0142] The system information carries at least indication information of the second resource required for applying for the second cell service (including frequency, bandwidth and other information of the first resource) and conditions that need to be met for using the first resource. The resources required for applying for the second cell are within the bandwidth of the second cell.

[0143] S53: The UE determines the resources required for applying for the second cell according to the received system information, and sends a first application signal on the resources. The first application signal is composed of a sequence pre-configured by the network.

[0144] S54. The UE receives a first response signal sent by the second cell to the first application signal, where the first response signal carries at least frequency domain location information of the second cell synchronization signal.

[0145] Furthermore, the response signal may also include the sequence used by the second cell synchronization signal. This sequence is also UE-specific. The UE can use this information not only to speed up the synchronization, but also to avoid synchronizing with the second cell that is not intended to serve itself. In addition, since the application signal sent by the UE is sent to the second cell, if the response is sent by the first cell, the network needs to know which first cell the application signal is allocated by. If this cannot be done, it should be assumed that the frequency domain position of the aforementioned application signal has a preset one-to-one correspondence or one-to-many relationship with the frequency domain position of the synchronization signal sent by the second cell. For example, let the frequency domain position of the aforementioned application signal be X, and the frequency domain position of the synchronization signal sent by the second cell be X+offset, where offset is a fixed value or one of several fixed values.

[0146] Furthermore, the value or value set of offset may also be indicated in the system information of the aforementioned first cell. In this case, step 4 may be omitted.

[0147] S55. The UE receives the synchronization signal sent by the second cell to achieve synchronization with the second cell.

[0148] The length of the synchronization signal sequence sent by the second cell or the resources occupied are smaller than the length of the synchronization signal sequence sent by the first cell. Regarding the timing of the synchronization signal sent by the second cell, there are two possible mechanisms: one possibility is that the AP constituting the second cell sends the synchronization signal according to the timing of receiving the application signal, and accordingly, the two parties can also agree on the timing between sending the application signal and the synchronization signal; the other possibility is that the AP constituting the second cell sends the synchronization signal according to its own clock. In the former mechanism, the UE detects the synchronization signal more quickly, but the cell-free system may need to serve multiple UEs at the same time, and the different timings of multiple UEs may cause relatively large interference. The latter mechanism can avoid the defects of the aforementioned mechanism, but the disadvantage is that the UE needs to perform a sliding search for the synchronization signal in time like the cell.

[0149] S56. The UE receives system information related to the cell sent by the second cell, where the system information at least includes second resource indication information for accessing the second cell;

[0150] S57. The UE sends a second application signal on the resources determined in S55 to apply for the second cell.

[0151] S58. The UE receives second response information sent by the second cell.

[0152] If the second response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0153] It should be noted that the first application signal sent by the UE in S53 is different from the second application signal sent by the UE in S56.

[0154] The first application signal is used to inform the network of the existence and application of the UE. The network sends a synchronization signal for downlink synchronization with the second cell to the UE according to the received application signal. When the UE sends the application signal, it has not yet achieved downlink synchronization with the second cell.

[0155] In addition, unlike the above-mentioned embodiments, since the first application signal is sent in the second cell, the receiving site of the second cell (such as an AP near the UE) can directly detect the signal sent by the UE and use channel reciprocity to determine the precoding used for sending the downlink signal of the second cell. Therefore, the first application signal sent in this implementation does not need to carry the measurement result of the first cell synchronization signal and can be implemented using a sequence pre-configured by the network.

[0156] Specifically, considering the function of the first application signal, the network will also configure some parameters related to the application signal, such as cyclic prefix length, guard interval length, etc. When sending the second application signal, the UE has achieved downlink synchronization with the second cell, and the application signal is used for uplink synchronization between the second cell and the UE.

[0157] Accordingly, on the network side, in order to assist the UE in applying for the second cell, the main tasks of the network include:

[0158] 1. Periodically send a synchronization signal of the first cell in the first cell.

[0159] Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0160] 2. Periodically send system information of the first cell in the first cell.

[0161] The system information carries at least indication information of the first resource required for applying for the second cell (including frequency, bandwidth and other information of the first resource) and conditions that need to be met for using the first resource. The resource required for applying for the second cell is within the bandwidth of the second cell.

[0162] 3. Receive a first application signal for applying for a second cell at a preset time-frequency position.

[0163] 4. Send a first response signal to the first application signal in the first cell.

[0164] 5. Send a synchronization signal in the second cell, where the synchronization signal is used for downlink synchronization between the aforementioned target UE and the second cell.

[0165] 6. Send system information related to the second cell in the second cell, where the system information at least includes second resource indication information required for accessing the second cell.

[0166] 7. Receive a second application signal for applying for a second cell at a preset time-frequency position.

[0167] It should be noted that the first application signal sent by the UE in step 3 is different from the application signal sent here.

[0168] 8. Send a second response signal to the second application signal in the second cell. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can communicate with the network in a two-way manner using the second cell.

[0169] In the above embodiment, the second cell sends the synchronization signal and other response signals only after receiving the application from the UE. This avoids the disadvantage of the traditional cellular system that the synchronization signal / system information needs to be sent periodically even if there is no UE, thus saving power and reducing interference.

[0170] Importantly, based on the received application signal sent by the UE or the measurement result carried by the application signal, the network can generate a UE-specific UE-centered cell, thereby greatly improving the performance of the UE access system. Finally, in the above embodiment, the UE obtains the application resources for applying for the second cell based on the first cell, but the two types of cells are not required to be synchronized, which also reduces the requirements for the application of the solution.

[0171] In one embodiment, a method for applying for access to a cell with dual application signals is provided. Figure 6 As shown,

[0172] S61. The first cell sends a downlink synchronization signal to the UE.

[0173] S62: The first cell sends a system message of the first cell to the UE. The system message carries at least indication information of the first resource required for applying for the second cell service.

[0174] S63. The UE sends a first application signal for the second cell to the second cell.

[0175] S64. The first cell sends a first response signal to the UE in response to the first application signal.

[0176] S65. The UE receives a synchronization signal of the second cell sent by the second cell.

[0177] S66. The UE receives a system message of the second cell sent by the second cell.

[0178] S67. The second cell receives a second application signal sent by the UE.

[0179] S68. The second cell sends a second response signal to the second application signal to the UE.

[0180] In one embodiment, a method for network access using a single application signal is provided.

[0181] like Figure 7 As shown, on the UE side, the UE obtains the second cell through the following steps:

[0182] S71. UE receives synchronization signals of one or more first cells.

[0183] Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0184] S72. UE receives the system information of the synchronized first cell.

[0185] The system information carries at least indication information for applying for resources required for the second cell service, frequency and bandwidth information of the second cell, and control resource set configuration information (resource set for sending PDCCH). The resources required for applying for the second cell are within the bandwidth of the second cell.

[0186] S73. The UE determines the resources required to apply for the second cell according to the received system information of the first cell, and sends a first application signal on the resources.

[0187] The first application signal is composed of a sequence pre-configured by the network. At the receiving end, the first application signal can be used for uplink synchronization between the second cell and the UE, and can also be used to determine the AP set serving the UE.

[0188] S74. The UE receives a first response signal sent by the second cell to the first application signal.

[0189] If the UE application is accepted, the response signal at least includes the cell identifier of the first cell indicating the aforementioned application signal, uplink authorization information, and the like.

[0190] S75. The UE sends the UE ID and other information required to apply for the second cell on the resources determined in the previous step.

[0191] S76: Receive a second response signal sent by the second cell. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0192] Accordingly, on the network side, in order to assist the UE in applying for the second cell, the main tasks of the network include:

[0193] 1. Periodically send a synchronization signal of the first cell in the first cell.

[0194] Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0195] 2. Periodically send system information of the first cell in the first cell.

[0196] The system information carries at least indication information for applying for resources required by the second cell, frequency and bandwidth information of the second cell, and control resource set configuration information (resource set for sending PDCCH). The resources required for applying for the second cell are within the bandwidth of the second cell.

[0197] 3. Receive an application signal sent by the UE for applying for a second cell.

[0198] 4. Send a response signal corresponding to the aforementioned application signal to the UE. If the UE's application is accepted, the response signal at least includes the first cell identifier to which the aforementioned application signal belongs, an uplink authorization message, and the like.

[0199] 5. Receive information sent by the UE using the aforementioned authorized resources, which at least includes information related to the UE ID.

[0200] 6. Send the response information of step 5 to the UE. If the UE's application is accepted, the response information at least includes the UE ID information received in step 5.

[0201] Compared with the above embodiment, the UE has fewer steps to access the second cell and does not need to apply to the second cell for sending a downlink synchronization signal, which also means that the UE can access the second cell faster.

[0202] It should be noted that this condition is that the UE can assume that it can use the downlink timing of the first cell to receive the signal of the second cell. In addition, after the UE accesses the second cell, the network can send the UE as needed.

[0203] Compared with the conventional 4-step access method of the cellular system, the main differences between this embodiment and the conventional 4-step access method are as follows:

[0204] The response signal sent by the network to the UE carries a first cell identifier. This design facilitates the sharing of the requested resources of the second cell among multiple first cells, thereby facilitating the realization that one second cell can serve UEs in multiple first cells. On the other hand, carrying this information can also achieve conflict resolution earlier, while in the existing traditional cellular system 4-step access method, conflict resolution is achieved in the last step.

[0205] In this embodiment, the UE initiates an access request to the second cell through the system information of the first cell, and in the existing traditional cellular system 4-step access method, the cell accessed by the UE and the cell corresponding to the system message are the same cell. In this embodiment, assuming that the first cell is a traditional cellular cell and the second cell is a decellularized cell with dense AP deployment, the UE access type second cell can obviously obtain a better user experience.

[0206] In one embodiment, a method for performing network access with a single application signal is provided. In this embodiment, a first application signal is sent in a first cell, and a DCI for scheduling a second cell to send a response signal is scrambled with a specific RA-RNTI.

[0207] like Figure 8 As shown, on the UE side, the UE obtains the second cell through the following steps:

[0208] S81. UE receives synchronization signals of one or more first cells.

[0209] Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0210] S82, UE receives the system information of the synchronized first cell.

[0211] The system information carries at least indication information for applying for resources required by the second cell, frequency and bandwidth information of the second cell, and control resource set configuration information (resource set for sending PDCCH). The resources required for applying for the second cell are within the bandwidth of the first cell.

[0212] S83. The UE determines the resources required to apply for the second cell according to the received system information, and sends a first application signal on the resources.

[0213] The first application signal carries information related to the measurement result of the first cell synchronization signal, such as the K first cell synchronization signal indexes (K>=2) with the strongest reference signal received power (RSRP) or reference signal received quality (RSRP) of the synchronization signal, the specific values ​​of RSRP / RSRQ corresponding to the K synchronization signal indexes, etc. Alternatively, the application signal carries the location information of the UE.

[0214] S84. The UE receives a first response signal sent by the second cell.

[0215] The DCI that schedules the first response signal is also sent by the second cell and is scrambled by a specific RA-RNTI, which is related to the first cell identifier of the aforementioned request signal. For example, the RNTI is determined by the index s of the first symbol of the request symbol in a time slot (set in the range of 0 to S-1), the index t of the time slot in a wireless frame (set in the range of 0 to T-1), the frequency domain index f of the request signal (for example, in the range of 0 to F-1), the carrier index value c of the request signal (for example, 0 to C-1), and the cell index value of the request signal (for example, in the range of 0 to P-1), where S, T, F, C, and P are all positive integers. The value of the RA-RNTI is as follows:

[0216] RA-RNTI=1+s+S*t+S*T*f+S*T*F*c+S*T*F*C*p

[0217] In addition, the response signal also carries an uplink authorization message.

[0218] S85. The UE sends the UE ID and other information required to apply for the second cell on the resources indicated by the uplink authorization in the previous step.

[0219] S86. Receive response information sent by the second cell.

[0220] If the UE's application is finally accepted, the response information at least includes the UE ID information sent in S85. If the UE obtains this information, it is equivalent to the application for the second cell being confirmed by the network. The UE can perform two-way communication with the network using the second cell.

[0221] Accordingly, on the network side, in order to assist the UE in applying for the second cell, the main tasks of the network include:

[0222] 1. Periodically send a synchronization signal of the first cell in the first cell. Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0223] 2. Periodically send system information of the first cell in the first cell. The system information carries at least indication information for applying for resources required for the second cell, frequency and bandwidth information of the second cell, and control resource set configuration information (resource set for sending PDCCH). The resources required for applying for the second cell are within the bandwidth of the first cell.

[0224] 3. Receive an application signal for applying for a second cell sent by the UE. The application signal carries information related to the measurement result of the first cell synchronization signal, such as the indexes of K first cell synchronization signals with the strongest received signals (K>=2).

[0225] 4. Send a response signal corresponding to the aforementioned request signal. The DCI that schedules the response signal is scrambled by a specific RA-RNTI, and the RNTI is related to the first cell identifier where the aforementioned request signal is located. For example, the RNTI is determined by the index s of the first symbol of the request symbol in a time slot (set in the range of 0 to S-1), the index t of the time slot in a wireless frame (set in the range of 0 to T-1), the frequency domain index f where the request signal is located (for example, in the range of 0 to F-1), the carrier index value c where the request signal is located (for example, 0 to C-1), and the cell index value where the request signal is located (for example, in the range of 0 to P-1). The value of the RA-RNTI is as follows:

[0226] RA-RNTI=1+s+S*t+S*T*f+S*T*F*c+S*T*F*C*p

[0227] In addition, the response signal also carries an uplink authorization message.

[0228] 5. Receive information sent by the UE using the aforementioned authorized resources, which at least includes information related to the UE ID.

[0229] 6. Send the response information of step 5 to the UE. If the UE's application is accepted, the response information at least includes the UE ID information received in step 5.

[0230] In one embodiment, a method for network access using a single application signal is provided. In this embodiment, the first application signal carries multiple first cell measurement results, the cell-B response signal carries the cell A identifier, and the cell A identifier is not considered when scheduling the response signal DCI scrambling.

[0231] On the UE side, the UE obtains the second cell through the following steps:

[0232] 1. The UE receives a synchronization signal from one or more first cells. Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0233] 2. The UE receives the synchronized system information of the first cell, where the system information carries at least indication information for applying for resources required for the second cell service.

[0234] 3. The UE determines the resources required to apply for the second cell based on the received system information, and sends an application signal on the resources.

[0235] The application signal carries information related to the measurement result of the synchronization signal of the first cell, such as the K first cell synchronization signal indexes (K>=2) with the strongest reference signal received power (RSRP) of the synchronization signal or the reference signal received quality (RSRP) of the synchronization signal, and the specific values ​​of RSRP / RSRQ corresponding to these K synchronization signal indexes. Without loss of generality, the UE usually chooses to send the application signal on the resources indicated by the first cell with the best RSRP / RSRQ. Considering the binding relationship between the application signal and the first cell, the first cell index with the strongest RSRP / RSRQ may not need to be displayed for notification. At the receiving end, the application signal can be used for uplink synchronization between the second cell and the UE, and can also be used to determine the set of APs serving the UE. Alternatively, the application signal carries the location information of the UE. At the receiving end, the application signal can be used for uplink synchronization between the second cell and the UE, and can also be used to determine the set of APs serving the UE.

[0236] 4. The UE receives a response signal sent by type cell B. If the UE application is accepted, the response signal includes at least the first cell identity to which the application signal belongs, uplink authorization information, etc. Different from embodiment 4, the RA-RNTI used for scheduling the DCI of the response signal is independent of the first cell identity.

[0237] 5. The UE sends the UE ID and other information required to apply for the second cell on the resources determined in the previous step.

[0238] 6. Receive the response information sent by the second cell. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can communicate with the network bidirectionally using the second cell.

[0239] Accordingly, on the network side, in order to assist the UE in applying for the second cell, the main tasks of the network include:

[0240] 1. Periodically send a synchronization signal of the first cell in the first cell. Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0241] 2. Periodically sending system information of the first cell in the first cell. The system information carries at least indication information for applying for resources required for the second cell service.

[0242] 3. Receive an application signal sent by the UE for applying for a second cell.

[0243] 4. Send a response signal corresponding to the aforementioned application signal to the UE. If the UE's application is accepted, the response signal at least includes the first cell identifier to which the aforementioned application signal belongs, an uplink authorization message, and the like.

[0244] 5. Receive information sent by the UE using the aforementioned authorized resources, which at least includes information related to the UE ID.

[0245] 6. Send the response information of step 5 to the UE. If the UE's application is accepted, the response information at least includes the UE ID information received in step 5.

[0246] In one embodiment, a method for network access with a single application signal is provided. In this embodiment, the first application signal is in the second cell, and the DCI for scheduling the second cell response signal is scrambled using an RA-RNTI related to the first cell identifier.

[0247] On the UE side, the UE obtains the second cell through the following steps:

[0248] 1. The UE receives a synchronization signal from one or more first cells. Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell.

[0249] 2. The UE receives synchronized system information of the first cell, which carries at least indication information of resources required for applying for services of the second cell, frequency and bandwidth information of the second cell, and control resource set configuration information (resource set for sending PDCCH). The resources required for applying for the second cell are within the bandwidth of the second cell.

[0250] 3. The UE determines the resources required to apply for the second cell based on the received system information, and sends an application signal on the resources. The application signal consists of a sequence pre-configured by the network. At the receiving end, the application signal can be used for uplink synchronization between the second cell and the UE, and can also be used to determine the AP set serving the UE.

[0251] 4. The UE receives the response signal sent by the second cell, and the DCI that schedules the response signal is scrambled by a specific RA-RNTI, which is related to the first cell identifier where the aforementioned request signal is located. For example, the RNTI is determined by the index s of the first symbol of the request symbol in a time slot (set in the range of 0 to S-1), the index t of the time slot in a wireless frame (set in the range of 0 to T-1), the frequency domain index f where the request signal is located (for example, in the range of 0 to F-1), the carrier index value c where the request signal is located (for example, 0 to C-1), and the cell index value where the request signal is located (for example, in the range of 0 to P-1), where S, T, F, C, and P are all positive integers. The value of the RA-RNTI is as follows:

[0252] RA-RNTI=1+s+S*t+S*T*f+S*T*F*c+S*T*F*C*p

[0253] In addition, the response signal also carries an uplink authorization message.

[0254] 5. The UE sends the UE ID and other information required to apply for the second cell on the resources determined in the previous step.

[0255] 6. Receive the response information sent by the second cell. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can communicate with the network bidirectionally using the second cell.

[0256] In one embodiment, a method for network access with a single application signal is provided. In this embodiment, a first application signal is sent in a second cell, and a response signal sent by the second cell carries an identifier of the first cell to which the application signal belongs;

[0257] like Fig. 9 As shown, on the UE side, the UE obtains the second cell through the following steps:

[0258] S91. UE receives synchronization signals of one or more first cells.

[0259] By using this synchronization signal, the UE can achieve downlink synchronization with at least one first cell. The UE receives the system information of the synchronized first cell, which carries at least the indication information of the resources required for applying for the second cell service, the frequency and bandwidth information of the second cell, and the control resource set configuration information (the resource set used to send PDCCH). The resources required for the aforementioned application for the second cell are within the bandwidth of the aforementioned second cell. It should be noted that the synchronization signal and system information received by the UE are Fig. 9 In the text, Msg0 is used to represent it, and the same applies below.

[0260] S92. The UE determines the resources required for applying for the second cell based on the received system information, and sends an application signal (represented by Msg1 in the figure below, the same below) on the resources. The application signal consists of a sequence pre-configured by the network. At the receiving end, the application signal can be used for uplink synchronization between the second cell and the UE, and can also be used to determine the set of APs serving the UE.

[0261] S93. The UE receives a PDCCH sent by the second cell indicating a response signal to the aforementioned Msg1 (represented by Msg2 in the following figure, the same below).

[0262] S94, the UE receives Msg2 sent by the second cell according to the received PDCCH. The UE receives a response signal sent by type cell B. If the UE application is accepted, the response signal includes at least the cell identifier of the first cell indicating the aforementioned application signal, an uplink authorization information, and the like.

[0263] S95. The UE sends the information required to apply for the second cell, such as the UE ID, on the resources determined in the previous step (represented by Msg3 in the figure below, the same below).

[0264] S96. The UE receives a PDCCH indicating a response signal to the aforementioned Msg3 (represented by Msg4 in the figure below, the same below).

[0265] S97, the UE receives Msg4 according to the received PDCCH. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0266] In this embodiment, the network needs to use one or more Msg2s to respond to multiple UEs. These UEs may correspond to different first cells (different PCIs). Accordingly, the network needs to inform the UE in Msg2 which cell the Msg2 is for, that is, the Msg2 carries the PCI (Physical cell Identification) information or part of the PCI information corresponding to the applying UE. The specific methods are as follows:

[0267] Method 1: Explicitly carry PCI information in Msg2. For example, there are 1008 PCIs in NR, which means that 10 bits can be used to indicate the PCI information. In addition, bits corresponding to some PCIs can also be carried, such as K bits representing the least significant bits of PCI (K is an integer, and 0 is the minimum value). <K<10)。

[0268] Mode 2: When determining the scrambling code (RA-RNTI) used by the PDCCH indicating Msg2, it is necessary to determine it according to the PCI of the first cell, for example, define RA-RNTI in the following manner:

[0269] RNTI is determined by the index s of the first symbol of Msg1 in a time slot (set in the range of 0 to S-1), the index t of the time slot in a wireless frame (set in the range of 0 to T-1), the frequency domain index f of Msg1 (for example, in the range of 0 to F-1), the carrier index value c of Msg1 (for example, in the range of 0 to C-1), and the cell index value of the request signal (for example, in the range of 0 to P-1), where S, T, F, C, and P are all positive integers. The values ​​of the RA-RNTI are as follows:

[0270] RA-RNTI=1+s+S*t+S*T*f+S*T*F*c+S*T*F*C*p

[0271] Method 3:

[0272] The PDCCH indicating Msg2 is sent by the first cell, and Msg2 itself has two possibilities: Msg2 is sent in the first cell or in the second cell. The details are shown in the following figure:

[0273] like Fig.10 As shown, the second cell is obtained by the following steps:

[0274] S101. A UE receives synchronization signals of one or more first cells. The UE receives first system information of synchronized first cells.

[0275] S102. The UE determines, according to the received system information, the resources required for applying for the second cell, and sends a first application signal on the resources.

[0276] S103. The UE receives a PDCCH of the first cell indicating a response signal of the aforementioned Msg1.

[0277] S104, the UE receives Msg2 sent by the second cell according to the received PDCCH. The UE receives a response signal sent by type cell B. If the UE application is accepted, the response signal includes at least the cell identifier of the first cell indicating the aforementioned application signal, an uplink authorization information, and the like.

[0278] S105. The UE sends the UE ID and other information required to apply for the second cell on the resources determined in the previous step.

[0279] S106. The UE receives a PDCCH indicating a response signal of the aforementioned Msg3.

[0280] S107, the UE receives Msg4 according to the received PDCCH. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0281] like Fig.11 As shown, the second cell is obtained by the following steps:

[0282] S111. A UE receives synchronization signals of one or more first cells. The UE receives first system information of synchronized first cells.

[0283] S112. The UE determines, according to the received system information, the resources required to apply for the second cell, and sends a first application signal on the resources.

[0284] S113. The UE receives a PDCCH of the second cell indicating a response signal of the aforementioned Msg1.

[0285] S114, the UE receives Msg2 sent by the second cell according to the received PDCCH. The UE receives a response signal sent by type cell B. If the UE application is accepted, the response signal includes at least the cell identifier of the first cell indicating the aforementioned application signal, an uplink authorization information, and the like.

[0286] S115. The UE sends the information required to apply for the second cell, such as the UE ID, on the resources determined in the previous step (represented by Msg3 in the figure below, the same below).

[0287] S116. The UE receives a PDCCH indicating a response signal to the aforementioned Msg3 (represented by Msg4 in the figure below, the same below).

[0288] S117, the UE receives Msg4 according to the received PDCCH. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can perform two-way communication with the network using the second cell.

[0289] Accordingly, on the network side, in order to assist the UE in applying for the second cell, the main tasks of the network include:

[0290] 1. Periodically send the synchronization signal of the first cell in the first cell. Using the synchronization signal, the UE can achieve downlink synchronization with at least one first cell. Periodically send the system information of the first cell in the first cell. The system information carries at least the indication information for applying for the resources required for the second cell, the frequency and bandwidth information of the second cell, and the control resource set configuration information (the resource set for sending the PDCCH). The resources required for the aforementioned application for the second cell are within the bandwidth of the aforementioned second cell.

[0291] 2. The receiving UE sends Msg1.

[0292] 3. Send a PDCCH indicating a response signal (Msg2) to the aforementioned Msg1.

[0293] 4. Send the aforementioned response signal (Msg2).

[0294] 5. Receive Msg3 sent by UE.

[0295] 6. Send PDCCH indicating Msg4.

[0296] 7. Send Msg4.

[0297] Compared with the above embodiment, the UE has fewer steps to access the second cell, and does not need to apply to the second cell to send a downlink synchronization signal, which also means that the second cell can be accessed faster. Of course, this is a condition that the UE can assume that it can use the downlink timing of the first cell to receive the signal of the second cell. In addition, after the UE accesses the second cell, the network can send the UE as needed. In addition, this embodiment can also be applied to the above embodiment. For example, steps 2 to 7 in this embodiment can replace the corresponding steps in the above embodiment.

[0298] Compared with the conventional 4-step access method of the cellular system, the main differences between this embodiment and the conventional 4-step access method are as follows:

[0299] The response signal sent by the network to the UE carries a first cell identifier. This design facilitates the sharing of the requested resources of the second cell among multiple first cells, thereby facilitating the realization that one second cell can serve UEs in multiple first cells. On the other hand, carrying this information can also achieve conflict resolution earlier, while in the existing traditional cellular system 4-step access method, conflict resolution is achieved in the last step.

[0300] In this embodiment, the UE initiates an access request to the second cell through the system information of the first cell, and in the existing traditional cellular system 4-step access method, the cell accessed by the UE and the cell corresponding to the system message are the same cell. In this embodiment, assuming that the first cell is a traditional cellular cell and the second cell is a decellularized cell with dense AP deployment, the UE can obviously obtain a better user experience by accessing the second cell.

[0301] The process of UE obtaining the second cell is as follows: Fig.12 Compared with the above embodiments, the main differences are:

[0302] like Fig.12 As shown, the second cell is obtained by the following steps:

[0303] S121. A UE receives synchronization signals of one or more first cells. The UE receives first system information of synchronized first cells.

[0304] S122. The UE determines, according to the received system information, the resources required to apply for the second cell, and sends a first application signal on the resources.

[0305] S123. The UE receives a PDCCH of the first cell indicating a response signal of the aforementioned Msg1.

[0306] S124, the UE receives Msg2 sent by the first cell according to the received PDCCH. The UE receives a response signal sent by type cell B. If the UE application is accepted, the response signal at least includes a cell identifier of the first cell indicating the aforementioned application signal, an uplink authorization information, and the like.

[0307] S125. The UE sends the UE ID and other information required to apply for the second cell to the first cell on the resources determined in the previous step.

[0308] S126. The UE receives the PDCCH sent by the first cell indicating the response signal of the aforementioned Msg3.

[0309] S127, the UE receives Msg4 sent by the second cell according to the received PDCCH. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can communicate with the network bidirectionally using the second cell.

[0310] In this embodiment, the TC-RNTI used for scrambling msg3 and the PDCCH scrambling used for Msg4 are the same, and this RNTI is indicated in Msg2. In this embodiment, the TC-RNTI used for scrambling msg3 and the PDCCH scrambling used for Msg4 are different, and the specific mechanism is as follows:

[0311] Mechanism 1: Msg2 provides two TC-RNTIs, one for scrambling msg3 and one for scrambling the PDCCH indicating Msg4.

[0312] Mechanism 2: Msg2 still provides only one TC-RNTI as in Example 7, and this RNTI is used for Msg3 scrambling. The second cell / target UE determines the RNTI for indicating the PDCCH scrambling of Msg4 according to the TC-RNTI and the PCI of the first cell.

[0313] Mechanism 3: Msg2 still provides only one TC-RNTI as in Embodiment 7, and the RNTI is used to indicate the PDCCH scrambling of Msg4. The first cell / target UE determines the TC-RNTI for Msg3 according to the TC-RNTI and the PCI of the first cell.

[0314] Another difference between this embodiment and the above-mentioned embodiment is that the PDCCH indicating Msg4 and Msg4 are both sent in the second cell.

[0315] In one embodiment, the process of the UE obtaining the second cell is as follows: Fig.13 shown.

[0316] S131. A UE receives synchronization signals of one or more first cells. The UE receives first system information of synchronized first cells.

[0317] S132. The UE determines, according to the received system information, the resources required to apply for the second cell, and sends a first application signal on the resources.

[0318] S133. The UE receives a PDCCH of the first cell indicating a response signal of the aforementioned Msg1.

[0319] S134, the UE receives Msg2 sent by the first cell according to the received PDCCH. The UE receives a response signal sent by type cell B. If the UE application is accepted, the response signal includes at least the cell identifier of the first cell indicating the aforementioned application signal, an uplink authorization information, and the like.

[0320] S135. The UE sends the UE ID and other information required to apply for the second cell to the second cell on the resources determined in the previous step.

[0321] S136. The UE receives the PDCCH sent by the first cell indicating the response signal of the aforementioned Msg3.

[0322] S137, the UE receives Msg4 sent by the second cell according to the received PDCCH. If the response signal indicates that the UE's application has been accepted, it means that the wireless connection between the UE and the second cell has been established, and the UE can communicate with the network bidirectionally using the second cell.

[0323] Compared with the previous embodiment, the main features are: Msg3, the PDCCH indicating Msg4 and Msg4 are all sent by the second cell. The signals before Msg3 are sent between the UE and the first cell.

[0324] The benefits of this program are:

[0325] Msg3, the PDCCH indicating Msg4, and Msg4 can use the same TC-RNTI for scrambling without causing conflicts. In this way, each MAC RAR in Msg2 only needs to carry one TC-RNTI.

[0326] One Msg2 can include multiple MAC RARs. In this case, Msg2 and the PDCCH indicating Msg2 are more like multicast signals. In terms of efficiency, it is more appropriate for them to be sent by the cell. This is because if they are sent by the second cell in a UE-specific manner, considering the CRC overhead, more resources may be consumed.

[0327] In one embodiment, a cell access device is provided, and the device is applied to a first node, such as Fig.14 As shown, the cell access method provided in the embodiment of the present application mainly includes:

[0328] The first receiving module 141 is configured to receive a first synchronization signal and first system information sent by the second node in the first cell, wherein the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending the first application signal;

[0329] A first sending module 142 is configured to send a first application signal, wherein the first application signal is used to request the second node to send first information;

[0330] The second receiving module 143 is configured to receive first information, wherein the first information is used to instruct the first node to access the second cell based on the first information.

[0331] In an exemplary embodiment, the first application signal is sent in a first cell, or the first application signal is sent in a second cell.

[0332] In an exemplary embodiment, when the first application signal is sent within the first cell, the first application signal carries measurement result information of the first cell synchronization signal or location information of the UE.

[0333] In an exemplary implementation, when the first application signal is sent in the second cell, the first application signal carries a sequence preconfigured by the network.

[0334] In an exemplary embodiment, the receiving the first information includes: receiving a first response signal, wherein the first response signal is a response signal to the first application signal.

[0335] In an exemplary embodiment, the step of the first node accessing the second cell based on the first information includes:

[0336] receiving a second synchronization signal, where the second synchronization signal is used for downlink synchronization between the first node and the second cell;

[0337] receiving second system information, where the second system information carries second resource indication information, where the second resource indication information is used to indicate resources required for sending a second application signal;

[0338] Sending a second application signal, where the second application signal is used for uplink synchronization between the first node and the second cell;

[0339] A second response signal is received, wherein the second response signal carries information allowing the first communication node to access.

[0340] In an exemplary embodiment, the receiving the second synchronization signal includes:

[0341] A second synchronization signal is received at the frequency domain position of the second synchronization signal; wherein the frequency domain position of the second synchronization signal is determined by the frequency domain position information carried in the first information, or the frequency domain position of the second synchronization signal is determined by the frequency domain position of the first synchronization signal and a preset relationship.

[0342] In an exemplary embodiment, the step of the first node accessing the second cell based on the first information includes:

[0343] A first physical downlink control channel PDCCH receiving a first response signal;

[0344] Receiving a first response signal based on the first PDCCH, wherein the first response signal carries a cell identifier and uplink authorization information of the first cell;

[0345] Sending a third application signal on the resources determined by the uplink authorization information, wherein the third application signal carries information required for applying for the second cell;

[0346] A second PDCCH receiving a third response signal; the third response signal is a response signal to the third application signal;

[0347] A third response signal is received based on the second PDCCH, wherein the third response signal carries information allowing the first communication node to access.

[0348] In an exemplary embodiment, the receiving of the first physical downlink control channel PDCCH of the first response signal includes:

[0349] A first physical downlink control channel PDCCH of a first response signal is received in a first cell.

[0350] In an exemplary embodiment, the receiving the first response signal includes:

[0351] A first response signal is received in the first cell, or a first response signal is received in the second cell.

[0352] In an exemplary implementation, the first PDCCH is scrambled using a first radio network temporary identifier RNTI.

[0353] In an exemplary embodiment, the third application signal and the second PDCCH are scrambled using a second RNTI, wherein the first RNTI and the second RNTI are the same, or the first RNTI and the second RNTI are different.

[0354] In an exemplary embodiment, the first response signal carries two different first RNTIs and second RNTIs.

[0355] In an exemplary embodiment, the first response signal carries the first RNTI; the second RNTI is determined by the first RNTI and a cell identifier of the first cell; or, the first response signal carries the second RNTI; the first RNTI is determined by the second RNTI and a cell identifier of the first cell.

[0356] In one embodiment, a cell access device is provided, and the device is applied to a second node, such as Fig.15 As shown, the cell access method provided in the embodiment of the present application mainly includes:

[0357] The second sending module 151 is configured to periodically send a first synchronization signal and first system information in the first cell; wherein, the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information is used to indicate the resources required for sending the first application signal;

[0358] The third receiving module 152 is configured to receive the first application signal; wherein the first application signal is used to request the second node to send the first information;

[0359] The third sending module 153 is configured to send first information, wherein the first information is used to instruct the first node to access the second cell based on the first information.

[0360] In an exemplary embodiment, when the first information is a first response signal, it includes: sending a second synchronization signal, the second synchronization signal is used for downlink synchronization of the first node and the second cell; sending second system information, the second system information carries second resource indication information, and the second resource indication information is used to indicate the resources required for sending a second application signal; receiving a second application signal, the second application signal is used for uplink synchronization of the first node and the second cell; sending a second response signal, the second response signal carries information allowing the first communication node to access.

[0361] In an exemplary embodiment, in the case where the first information is the first physical downlink control channel PDCCH of a first response signal, it includes: sending the first physical downlink control channel PDCCH of a first response signal; sending a first response signal, wherein the first response signal carries the cell identifier and uplink authorization information of the first cell; receiving a third application signal, wherein the third application signal carries the information required to apply for a second cell; sending a second PDCCH of a third response signal; the third response signal is a response signal of the third application signal; sending a third response signal, wherein the third response signal carries information allowing the first communication node to access.

[0362] The cell access device provided in this embodiment can execute the cell access method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the method. For technical details not described in detail in this embodiment, please refer to the cell access method provided in any embodiment of the present invention.

[0363] It is worth noting that in the embodiment of the above-mentioned cell access device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific name of each functional unit is only for the convenience of distinguishing each other, and is not used to limit the scope of protection of this application.

[0364] The present application also provides a device, Fig.16 is a schematic diagram of the structure of a device provided in an embodiment of the present application, such as Fig.16 As shown, the device includes a processor 161, a memory 162, an input device 163, an output device 164 and a communication device 165; the number of processors 161 in the device can be one or more. Fig.16 A processor 161 is taken as an example; the processor 161, memory 162, input device 163 and output device 164 in the device can be connected via a bus or other means, and FIG16 takes the connection via a bus as an example.

[0365] The memory 162, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the cell access method in the embodiment of the present application (for example, the first receiving module 141, the first sending module 142, and the second receiving module 143 in the cell access device). Another example is the program instructions / modules corresponding to the cell access method in the embodiment of the present application (for example, the second sending module 151, the third receiving module 152, and the third sending module 153 in the cell access device). The processor 161 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 162, that is, implements any cell access method provided in the embodiment of the present application.

[0366] The memory 162 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the device, etc. In addition, the memory 162 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 162 may further include a memory remotely arranged relative to the processor 161, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0367] The input device 163 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the device. The output device 164 may include a display device such as a display screen.

[0368] The communication device 165 may include a receiver and a transmitter. The communication device 165 is configured to perform information transmission and reception communication according to the control of the processor 161.

[0369] It should be noted that, when the above-mentioned device is a first node, the processor 161 executes various functional applications and data processing by running the program stored in the system memory 162, for example, implementing the cell access method provided in the embodiment of the present application, the method including:

[0370] Receive a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information at least includes an indication of resources required for sending a first application signal;

[0371] Sending a first application signal, wherein the first application signal is used to request the second node to send first information;

[0372] Receive first information, wherein the first information is used to instruct the first node to access the second cell based on the first information. Of course, those skilled in the art can understand that the processor 161 can also implement the technical solution of the cell access method provided in any embodiment of the present application. The hardware structure and function of the device can refer to the content explanation of this embodiment.

[0373] It should be noted that, when the above-mentioned device is a second node, the processor 161 executes various functional applications and data processing by running the program stored in the system memory 162, for example, implementing the cell access method provided in the embodiment of the present application, the method including:

[0374] A first synchronization signal and first system information periodically sent in a first cell; wherein, the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending a first application signal;

[0375] receiving the first application signal; wherein the first application signal is used to request the second node to send first information;

[0376] Send first information, where the first information is used to instruct the first node to access the second cell based on the first information.

[0377] Of course, those skilled in the art can understand that the processor 610 can also implement the technical solution of the message interaction method provided in any embodiment of the present application. The hardware structure and function of the device can refer to the content explanation of this embodiment.

[0378] In an exemplary embodiment, the present application also provides a storage medium containing computer executable instructions, wherein the computer executable instructions are used to execute a cell access method when executed by a computer processor, and the method is applied to a first node, including:

[0379] Receive a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, and the first system information carries first resource indication information, and the first resource indication information at least includes an indication of resources required to send a first application signal;

[0380] Sending a first application signal, wherein the first application signal is used to request the second node to send first information;

[0381] First information is received, where the first information is used to instruct the first node to access the second cell based on the first information.

[0382] Of course, the storage medium containing computer executable instructions provided in the embodiment of the present application, whose computer executable instructions are not limited to the method operations described above, can also execute related operations in the cell access method provided in any embodiment of the present application.

[0383] The embodiment of the present application further provides a storage medium including computer executable instructions, wherein the computer executable instructions are used to execute a cell access method when executed by a computer processor, wherein the method is applied to a second node and includes:

[0384] A first synchronization signal and first system information periodically sent in a first cell; wherein, the first synchronization signal is used for downlink synchronization between the first communication node and the first cell, the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending a first application signal;

[0385] receiving the first application signal; wherein the first application signal is used to request the second node to send first information;

[0386] Send first information, where the first information is used to instruct the first node to access the second cell based on the first information.

[0387] Of course, the storage medium containing computer executable instructions provided in the embodiment of the present application, whose computer executable instructions are not limited to the method operations described above, can also execute related operations in the cell access method provided in any embodiment of the present application.

[0388] Through the above description of the implementation method, the technicians in the relevant field can clearly understand that the present application can be implemented with the help of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application can be essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0389] The above description is merely an exemplary embodiment of the present application and is not intended to limit the protection scope of the present application.

[0390] It will be appreciated by those skilled in the art that the term user terminal covers any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser or a vehicle-mounted mobile station.

[0391] In general, various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic or any combination thereof. For example, some aspects can be implemented in hardware, while other aspects can be implemented in firmware or software that can be executed by a controller, microprocessor or other computing device, although the present application is not limited thereto.

[0392] Embodiments of the present application may be implemented by executing computer program instructions by a data processor of a mobile device, for example in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages.

[0393] The block diagram of any logic flow in the accompanying drawings of the present application can represent program steps, or can represent interconnected logic circuits, modules and functions, or can represent a combination of program steps and logic circuits, modules and functions. The computer program can be stored on a memory. The memory can have any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read-only memory (ROM), random access memory (RAM), optical memory device and system (digital versatile disc DVD or CD disc), etc. Computer-readable media may include non-transient storage media. The data processor can be any type suitable for the local technical environment, such as but not limited to a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (FGPA) and a processor based on a multi-core processor architecture.

[0394] By way of exemplary and non-limiting examples, a detailed description of exemplary embodiments of the present application has been provided above. However, various modifications and adjustments to the above embodiments will be apparent to those skilled in the art when considered in conjunction with the accompanying drawings and claims, but will not depart from the scope of the present invention. Therefore, the proper scope of the present invention will be determined according to the claims.

Claims

1. A cell access method, characterized in that: The method is applied to a first node, comprising: receiving a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization between the first node and the first cell, and the first system information carries first resource indication information, and the first resource indication information at least includes an indication of resources required for sending a first application signal; Sending a first application signal, wherein the first application signal is used to request the second node to send first information; receiving first information, wherein the first information is used to instruct the first node to access the second cell based on the first information; The first cell is a public cell, and the second cell is an exclusive cell for a single user equipment in a cell-free system, which is implemented by distributed densely deployed APs.

2. The method according to claim 1, characterized in that The first application signal is sent in the first cell, or the first application signal is sent in the second cell.

3. The method according to claim 2, characterized in that When the first application signal is sent within the first cell, the first application signal carries measurement result information of the first cell synchronization signal or location information of the first node.

4. The method according to claim 2, characterized in that: When the first application signal is sent in the second cell, the first application signal carries a sequence pre-configured by the network.

5. The method according to claim 3 or 4, characterized in that: The receiving of the first information comprises: A first response signal is received, wherein the first response signal is a response signal to the first application signal.

6. The method according to claim 5, characterized in that The step of the first node accessing the second cell based on the first information includes: receiving a second synchronization signal, where the second synchronization signal is used for downlink synchronization between the first node and the second cell; receiving second system information, where the second system information carries second resource indication information, where the second resource indication information is used to indicate resources required for sending a second application signal; Sending a second application signal, where the second application signal is used for uplink synchronization between the first node and the second cell; A second response signal is received, where the second response signal carries information allowing the first node to access.

7. The method according to claim 6, characterized in that The receiving a second synchronization signal comprises: A second synchronization signal is received at the frequency domain position of the second synchronization signal; wherein the frequency domain position of the second synchronization signal is determined by the frequency domain position information carried in the first information, or the frequency domain position of the second synchronization signal is determined by the frequency domain position of the first synchronization signal and a preset relationship.

8. The method according to claim 1, characterized in that The step of the first node accessing the second cell based on the first information includes: A first physical downlink control channel PDCCH receiving a first response signal; Receiving a first response signal based on the first PDCCH, wherein the first response signal carries a cell identifier and uplink authorization information of the first cell; Sending a third application signal on the resources determined by the uplink authorization information, wherein the third application signal carries information required for applying for the second cell; A second PDCCH receiving a third response signal; the third response signal is a response signal to the third application signal; A third response signal is received based on the second PDCCH, wherein the third response signal carries information allowing the first node to access.

9. The method according to claim 8, characterized in that The first physical downlink control channel PDCCH receiving the first response signal includes: A first physical downlink control channel PDCCH of a first response signal is received in a first cell.

10. The method according to claim 8, characterized in that The receiving a first response signal comprises: A first response signal is received in the first cell, or a first response signal is received in the second cell.

11. The method according to claim 8, characterized in that The first PDCCH is scrambled using a first radio network temporary identifier RNTI.

12. The method according to claim 11, characterized in that The third application signal and the second PDCCH are scrambled using a second RNTI, wherein the first RNTI and the second RNTI are the same, or the first RNTI and the second RNTI are different.

13. The method according to claim 12, characterized in that The first response signal carries two different first RNTIs and second RNTIs.

14. The method according to claim 13, characterized in that The first response signal carries the first RNTI; the second RNTI is determined by the first RNTI and the cell identifier of the first cell, or the first response signal carries the second RNTI; the first RNTI is determined by the second RNTI and the cell identifier of the first cell.

15. A cell access method, characterized in that: The method is applied to the second node, comprising: a first synchronization signal and first system information periodically sent in a first cell; Wherein, the first synchronization signal is used for downlink synchronization between the first node and the first cell, the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending the first application signal; receiving the first application signal; wherein the first application signal is used to request the second node to send first information; Sending first information, wherein the first information is used to instruct the first node to access the second cell based on the first information; The first cell is a public cell, and the second cell is an exclusive cell for a single user equipment in a cell-free system, which is implemented by distributed densely deployed APs.

16. The method according to claim 15, characterized in that In the case where the first information is a first response signal, the method includes: Sending a second synchronization signal, where the second synchronization signal is used for downlink synchronization between the first node and the second cell; Sending second system information, where the second system information carries second resource indication information, and the second resource indication information is used to indicate resources required for sending the second application signal; receiving a second application signal, where the second application signal is used for uplink synchronization between the first node and the second cell; A second response signal is sent, wherein the second response signal carries information allowing the first communication node to access.

17. The method according to claim 15, characterized in that In a case where the first information is a first physical downlink control channel PDCCH of a first response signal, the method includes: A first physical downlink control channel PDCCH for sending a first response signal; Sending a first response signal, wherein the first response signal carries a cell identifier and uplink authorization information of the first cell; receiving a third application signal, wherein the third application signal carries information required for applying for the second cell; a second PDCCH for sending a third response signal; wherein the third response signal is a response signal to the third application signal; A third response signal is sent, wherein the third response signal carries information allowing the first node to access.

18. A cell access device, characterized in that: The device is configured at a first node and includes: A first receiving module is configured to receive a first synchronization signal and first system information sent by a second node in a first cell, wherein the first synchronization signal is used for downlink synchronization between the first node and the first cell, and the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending a first application signal; A first sending module is configured to send a first application signal, wherein the first application signal is used to request the second node to send first information; A second receiving module is configured to receive first information, wherein the first information is used to instruct the first node to access the second cell based on the first information; The first cell is a public cell, and the second cell is an exclusive cell for a single user equipment in a cell-free system, which is implemented by distributed densely deployed APs.

19. A cell access device, characterized in that: The device is configured at the second node and includes: A second sending module is configured to periodically send a first synchronization signal and first system information in the first cell; wherein the first synchronization signal is used for downlink synchronization between the first node and the first cell, and the first system information carries first resource indication information, and the first resource indication information is used to indicate resources required for sending the first application signal; A third receiving module is configured to receive the first application signal; wherein the first application signal is used to request the second node to send the first information; A third sending module is configured to send first information, wherein the first information is used to instruct the first node to access the second cell based on the first information; The first cell is a public cell, and the second cell is an exclusive cell for a single user equipment in a cell-free system, which is implemented by distributed densely deployed APs.

20. A device, characterized in that include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 17.

21. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 17 is implemented.

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