Random access response method, network device, apparatus, and storage medium

Abstract

Embodiments of the present application provide a random access response method, network device, apparatus and storage medium, wherein the method comprises: receiving a random access preamble sent by a terminal through a PRACH resource, determining a first RRU which is the RRU with the maximum received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs, the terminal comprising a first terminal and a second terminal; determining a neighboring RRU set of the first RRU according to a plurality of RRU-merged neighboring RRU sets of each RRU in a cell; deleting a second RRU which does not belong to the neighboring RRU set of the first RRU among all RRUs to which the preamble belongs, to obtain an RRU set to which the first terminal belongs in a coverage area of the first RRU; and sending a random access response message to the first terminal on the RRU set to which the first terminal belongs, and not sending a random access response message to the second terminal in a coverage area of the second RRU.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a random access response method, network device, apparatus, and storage medium. Background Technology

[0002] Network devices establish uplink synchronization with the terminal (User Equipment, UE) through a random access procedure, wherein uplink timing synchronization is determined by MSG1 and MSG2, and contention issues are resolved by MSG3 and MSG4.

[0003] Before uplink synchronization is determined, network devices configure the available preamble for each Synchronisation Signal Block (SSB). Terminals randomly select the preamble, which may result in different terminals selecting the same preamble, causing random access collisions.

[0004] Currently, a terminal can only know whether it has experienced a collision after the four-step random access process is completed. If the random access fails due to a collision, a new round of access requests is initiated, resulting in significant access latency. Furthermore, an invalid random access process can increase cell interference. Summary of the Invention

[0005] To address the problems existing in related technologies, embodiments of this application provide a random access response method, network device, apparatus, and storage medium.

[0006] In a first aspect, embodiments of this application provide a random access response method, including:

[0007] The receiving terminal uses the random access preamble sent by the PRACH resource to determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal.

[0008] The neighboring RRU set of the first RRU is determined based on the neighboring RRU set of each RRU in the multi-RRU merging cell;

[0009] Delete the second RRU that is not in the adjacent RRU set of all RRUs to which the preamble belongs, and obtain the RRU set to which the first terminal belongs within the coverage area of ​​the first RRU.

[0010] The system sends a random access response message to the first terminal on the RRU set to which the first terminal belongs, but does not send a random access response message to the second terminal within the coverage area of ​​the second RRU.

[0011] Optionally, the set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined through the following steps:

[0012] When the multi-RRU merging cell is established, the initial set of neighboring RRUs for each RRU in the multi-RRU merging cell is determined;

[0013] During the operation of the cell network, the set of neighboring RRUs for each RRU is updated based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information.

[0014] Optionally, determining the initial set of neighboring RRUs for each RRU within the multi-RRU merging cell includes:

[0015] The initial set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined to include all other RRUs within the multi-RRU merging cell; or,

[0016] Based on the relative positional relationship of each RRU within the multi-RRU merged cell, the initial set of neighboring RRUs for each RRU within the multi-RRU merged cell is determined.

[0017] Optionally, updating the set of neighboring RRUs for each RRU based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information includes:

[0018] Within the multi-RRU merged cell, the received power and / or signal-to-noise ratio of the connected terminal on each RRU at the current time are measured, and the RRU corresponding to the maximum value of the received power or signal-to-noise ratio is determined as the target RRU, and the connected terminal corresponding to the target terminal is determined as the target terminal.

[0019] Determine whether the relationship between the received power and / or signal-to-noise ratio of all other RRUs (excluding the target RRU) when receiving the target terminal information and the maximum value satisfies a preset condition;

[0020] Increment the counter corresponding to the RRU that meets the preset conditions by 1;

[0021] The set of neighboring RRUs of the target RRU is updated based on the change values ​​of the counters corresponding to each RRU within a preset time or a preset number of statistical counts.

[0022] Optionally, the method further includes:

[0023] The uplink transmission advance is determined based on the uplink signal received from the RRU set to which the first terminal belongs, and the uplink transmission advance is sent to the first terminal.

[0024] Optionally, the method further includes:

[0025] Receive a random access request resent by the second terminal after it has not received a random access response message within a preset time after sending the random access request.

[0026] Secondly, embodiments of this application also provide a network device, including a memory, a transceiver, and a processor;

[0027] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and executing the random access response method provided in the first aspect as described above.

[0028] Thirdly, embodiments of this application also provide a random access response device, comprising:

[0029] The receiving module is used to receive the random access preamble sent by the terminal through the PRACH resource, and determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal.

[0030] The determination module is used to determine the set of neighboring RRUs of the first RRU based on the set of neighboring RRUs of each RRU in the multi-RRU merging cell;

[0031] The deletion module is used to delete the second RRU that does not belong to the first RRU from all RRUs to which the preamble belongs, and obtain the RRU set to which the first terminal belongs within the coverage area of ​​the first RRU.

[0032] The sending module is configured to send a random access response message to the first terminal on the RRU set to which the first terminal belongs, but not to send a random access response message to the second terminal within the coverage area of ​​the second RRU.

[0033] Fourthly, embodiments of this application also provide a processor-readable storage medium storing a computer program for causing the processor to execute the random access response method provided in the first aspect as described above.

[0034] Fifthly, embodiments of this application also provide a computer-readable storage medium storing a computer program for causing a computer to execute the random access response method provided in the first aspect as described above.

[0035] In a sixth aspect, embodiments of this application also provide a communication device readable storage medium storing a computer program for causing the communication device to execute the random access response method provided in the first aspect as described above.

[0036] In a seventh aspect, embodiments of this application also provide a chip product readable storage medium storing a computer program for causing the chip product to execute the random access response method provided in the first aspect as described above.

[0037] The random access response method, network device, apparatus, and storage medium provided in this application, after receiving the random access preamble sent by the terminal through PRACH resources, selects the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU; compares the obtained set of neighboring RRUs of the first RRU in the multi-RRU merging cell with all RRUs to which the preamble belongs, and deletes the second RRUs that are not in the set of neighboring RRUs of the first RRU among all RRUs to which the preamble belongs; then, feeds back a random access response message to the first terminal on the first RRU, but does not feed back a random access response message to the second terminal other than the first terminal; this application, combined with the special characteristics of cell networking, identifies colliding terminals that send the same preamble, determines the set of RRUs to which the first terminal with a high probability of successful random access belongs, feeds back a random access message to the first terminal but not to the second terminal, so that the second terminal within the coverage area of ​​other RRUs can know in time that the random access has failed, thereby reducing user access latency and network interference. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the four-step random access process provided by related technologies;

[0040] Figure 2 This is a flowchart illustrating the random access response method provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram illustrating the arrangement of all RRUs within a multi-RRU merging cell provided in this application embodiment;

[0042] Figure 4 This is a schematic diagram of the network device provided in the embodiments of this application;

[0043] Figure 5This is a schematic diagram of the structure of the random access response device provided in the embodiments of this application. Detailed Implementation

[0044] To better describe the technical solutions in the embodiments of this application, relevant knowledge is introduced below.

[0045] (1) Random access procedure

[0046] The network device synchronizes with the UE uplink through a random access procedure. Figure 1 This is a schematic diagram of the four-step random access process provided by related technologies, such as... Figure 1 As shown, the four-step random access process includes:

[0047] Step 1: The UE sends message MSG1 to the network device.

[0048] The UE selects a random access preamble and a Physical Random Access Channel (PRACH) resource, and uses the PRACH resource to send the selected random access preamble to the network device.

[0049] Step 2: The network device sends MSG2 to the UE.

[0050] The network device receives the random access preamble sent by the UE and sends a Random Access Response (RAR) message to the UE.

[0051] Step 3: The UE sends Msg3 to the network device.

[0052] The UE sends uplink transmissions on the uplink scheduling grant specified in MSG2. The content of the uplink transmissions differs for different random access methods in MSG3. In the MSG3 phase, the UE sends its unique identifier to the network device, which is used by the network device to identify the UE.

[0053] Step 4: The network device sends MSG4 to the UE.

[0054] The network device sends a contention resolution message to the UE, and the UE determines whether the random access was successful based on MSG4.

[0055] In the four-step contention-based random access process, uplink timing synchronization is determined by MSG1 and MSG2, and contention issues are resolved by MSG3 and MSG4. Non-contention-based random access only includes MSG1 and MSG2.

[0056] (2) Physical Random Access Channel

[0057] PRACH is used to complete uplink synchronization between the UE and the network device, and is the first uplink signal (MSG1) sent during random access. The network device estimates the signal transmission delay between the UE and the network device based on the received PRACH signal, and calculates the uplink transmission timing advance (TA) and sends it to the UE. After receiving the uplink transmission timing advance, the UE, based on the uplink timing obtained from the downlink timing, and in combination with the uplink transmission timing advance, can ensure that MSG3 arrives at the network device within the network device's expected reception time period.

[0058] (3) Preamble collision

[0059] Before uplink synchronization is established, network devices configure the available preambles for each SSB. When a UE accesses the network, it randomly selects one preamble from the available preambles for that SSB. Generally, the preambles selected by the UEs are different and orthogonal to each other. Since the preamble is randomly selected, different users may choose the same preamble. In the next scheduling (MSG2), the network device cannot identify the different users with colliding preambles and can only respond with the same MSG2 information. The network device simultaneously responds with MSG2 to the colliding users and simultaneously receives MSG3, which to some extent not only affects the access latency of the colliding users but also increases the network interference level.

[0060] The scheduling information for MSG3, used during contention for access, is issued by MSG2. MSG3 and MSG4 can utilize the Cell Radio Network Temporary Identity (C-RNTI) to resolve the issue of different UEs using the same preamble within the same beam.

[0061] Therefore, for multi-user collision processes that select the same preamble for access, current related technologies can only identify whether the UE has successfully accessed the network after all MSG1-MSG4 of the random access process has been completed. If the access fails, the UE will re-initiate the next random access.

[0062] (4) Random access collision probability

[0063] Random access probability is a significant factor affecting call setup latency, data recovery latency in uplink asynchronous states, and handover latency, and also influences call setup success rate and handover success rate. Since uplink resource units need to be reserved specifically for PRACH, the amount of reserved resources affects network capacity. Reserving too many resources can resolve PRACH collision issues, but it reduces network capacity; conversely, compressing PRACH resources increases the collision probability.

[0064] (5) Community merging

[0065] In mobile communication systems, users spend very little time in a cell, leading to frequent cell reselection and handover, which seriously affects communication quality. One solution is to expand the coverage area of ​​the cell.

[0066] Cell merging refers to the process of using optical fiber to combine the baseband signals of Radio Remote Units (RRUs) installed at different base station sites into a single physical cell through a Base Band Unit (BBU), thereby expanding the cell's coverage area.

[0067] The benefits of cell merging include: reduced handover, lower call drop rate, reduced neighbor cell relationships, allowing different physical cells within a single logical cell, selective adjustment of network structure, and more flexible network expansion and coverage.

[0068] (6) The process of random access in related technologies

[0069] Step 1: During random access, the network device receives PRACH signals from all RRUs. It compares the received power or signal-to-noise ratio of PRACH on each RRU with a given threshold to determine the RRUs that meet the threshold requirements as RRUs with PRACH signals. All RRUs that meet the threshold are the RRUs to which the user belongs.

[0070] Step 2: Based on the parsing of the PRACH signal by all RRUs to which the user belongs, determine the preamble of the access user, and send MSG2 to the user on the corresponding RRU, as well as receive the subsequent MSG3 and send MSG4 to complete the entire random access process.

[0071] Step 3: If the user confirms successful access after the MSG1-MSG4 process is completed, the user enters the connected state; otherwise, the user continues to re-initiate random access.

[0072] Step 4: If more than one user initiates random access at the same time during the random access process and randomly selects the same preamble, the BBU will receive PRACH messages from different users on different RRUs. However, the BBU will not distinguish between multiple users; instead, it will treat the PRACH messages from multiple users as information for a single user and complete the subsequent MSG2-MSG4 process. After MSG4, only one user will successfully access the system; other users will fail to access the system and need to re-initiate the access process.

[0073] In summary, a terminal can only determine whether it has experienced a collision after the four-step random access process is completed. If random access fails due to a collision, a new round of access requests is initiated, resulting in significant access latency. Furthermore, an invalid random access process can increase cell interference.

[0074] To address the aforementioned problems in the prior art, this application provides a random access response method, network device, apparatus, and storage medium. Taking into account the unique characteristics of cell networking, it identifies colliding terminals sending the same preamble, determines the RRU set to which the first terminal with a higher probability of successful random access belongs, and sends a random access message to the first terminal instead of sending a random access response message to the second terminal. This allows the second terminal within the coverage area of ​​other RRUs to be promptly notified of random access failure, reducing user access latency and network interference.

[0075] In the embodiments of this application, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0076] In the embodiments of this application, the term "multiple" refers to two or more, and other quantifiers are similar.

[0077] The technical solutions provided in this application can be applied to various systems, especially 5G systems. For example, applicable systems include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and 5G New Radio (NR). All of these systems include terminal equipment and network equipment. The system may also include a core network component, such as the Evolved Packet System (EPS) or the 5G system (5GS).

[0078] The terminal devices involved in the embodiments of this application can be devices that provide voice and / or data connectivity to users, handheld devices with wireless connectivity, or other processing devices connected to a wireless modem. The names of the terminal devices may differ in different systems; for example, in a 5G system, a terminal device can be called User Equipment (UE). Wireless terminal devices can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, for example, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices that exchange voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but this application embodiment does not limit the terminology.

[0079] The network device involved in this application embodiment can be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, a base station may also be called an access point, or a device in an access network that communicates with a wireless terminal device through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also coordinate the attribute management of the air interface. For example, the network equipment involved in the embodiments of this application can be a base transceiver station (BTS) in a Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA) system, a NodeB in a Wide-band Code Division Multiple Access (WCDMA) system, an evolved Node B (eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station (gNB) in a Next Generation System, a Home evolved Node B (HeNB), a relay node, a Femto, a Pico, etc., and is not limited in the embodiments of this application. In some network structures, the network equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may also be geographically separated.

[0080] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0081] Figure 2 This is a flowchart illustrating the random access response method provided in an embodiment of this application, as shown below. Figure 2As shown, the execution subject of this method is a network device, such as a base station, and the method includes at least the following steps:

[0082] Step 201: The receiving terminal sends a random access preamble through the PRACH resource, and determines the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal.

[0083] Specifically, in a multi-RRU merged cell, the network device receives the random access preamble (MSG1) sent by the terminal through the PRACH resource, and determines the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU.

[0084] When a network device receives a PRACH signal sent by a terminal, it measures the received power and / or signal-to-noise ratio of each RRU. Based on the current user antenna attribution strategy, it selects all RRUs to which the PRACH belongs. Based on all RRUs to which the PRACH belongs, it completes the detection of PRACH resources and obtains the random access preamble sent by the terminal through the PRACH resources, such as the preamble identifier.

[0085] For a preamble that passes PRACH detection, the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs is designated as the first RRU. Generally speaking, terminals within the coverage area of ​​an RRU with a higher signal-to-noise ratio or higher received power have a relatively higher probability of successful random access.

[0086] Received power and signal-to-noise ratio can be measured information such as the Physical Uplink Shared Channel (PUSCH), Physical Downlink Control Channel (PDCCH), and Sounding Reference Signal (SRS) received by the BBU from the terminal.

[0087] At this point, the network device does not know whether the terminal sending the PRACH is a single terminal or multiple randomly selected terminals with the same preamble. Terminals are categorized as a first terminal and a second terminal. The first terminal is the terminal within the coverage area of ​​the first RRU, and the second terminal is any other terminal besides the first terminal. The first terminal has the highest received power and / or signal-to-noise ratio, while the second terminal has a lower received power and / or signal-to-noise ratio. Therefore, the first terminal has a relatively higher probability of successful random access.

[0088] In actual implementation, there may be no second terminal, indicating that there is only one terminal corresponding to the PRACH resource, and no preamble collision has occurred.

[0089] Step 202: Determine the set of neighboring RRUs for the first RRU based on the set of neighboring RRUs for each RRU in the multi-RRU merging cell.

[0090] Specifically, the set of neighboring RRUs of the first RRU is determined based on the set of neighboring RRUs of each RRU in the multi-RRU merging cell, and this set serves as the basis for subsequently determining the first terminal.

[0091] Within a multi-RRU merging cell, a list can be pre-built containing each RRU and the adjacency relationships between different RRUs. This list can be continuously updated based on actual conditions, and network devices can directly access it when needed.

[0092] Step 203: Delete the second RRU that does not belong to the set of adjacent RRUs of the first RRU among all RRUs to which the preamble belongs, to obtain the set of RRUs to which the first terminal belongs within the coverage area of ​​the first RRU.

[0093] Specifically, by deleting the second RRUs that are not adjacent to the first RRU from all RRUs to which the preamble belongs, that is, deleting the second RRUs that are not adjacent to the first RRU from all RRUs to which the preamble belongs, we obtain the set of RRUs to which the first terminal belongs within the coverage area of ​​the first RRU, which is equivalent to determining the first terminal. The second RRUs can be regarded as the RRUs to which the possible collision terminals belong.

[0094] If the second RRU does not exist, meaning that all the RRUs to which the preamble belongs are in the set of adjacent RRUs of the first RRU, it indicates that there is no preamble collision, and there is only one terminal sending this PRACH resource, namely the first terminal.

[0095] Step 204: Send a random access response message to the first terminal on the RRU set to which the first terminal belongs, but do not send a random access response message to the second terminal in the coverage area of ​​the second RRU.

[0096] Specifically, after determining the RRU set to which the first terminal belongs within the coverage area of ​​the first RRU, a random access response message (MSG2) is sent to the first terminal on the RRU set to which the first terminal belongs, but no random access response message (MSG2) is sent to the second terminal within the coverage area of ​​the second RRU.

[0097] For a PRACH and its corresponding preamble received by a network device, the first RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs is first selected. The set of neighboring RRUs of the first RRU is obtained and compared with the set of RRUs to which the preamble belongs. Second RRUs that are not adjacent to the first RRU are filtered out. MSG2 is sent only to the first terminal within the coverage area of ​​the first RRU, and MSG2 is not fed back to the second terminal within the coverage area of ​​the second RRU. This can determine whether a preamble collision has occurred. When a preamble collision occurs, MSG2 is fed back to the set of RRUs to which the first terminal belongs, so that terminals within the coverage area of ​​other RRUs can know in time that the access has failed.

[0098] The random access response method provided in this application, after receiving the random access preamble sent by the terminal through PRACH resources, selects the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU; compares the set of neighboring RRUs of the first RRU in the multi-RRU merging cell with all RRUs to which the preamble belongs, and deletes the second RRUs that are not in the set of neighboring RRUs of the first RRU among all RRUs to which the preamble belongs; then, feeds back a random access response message to the first terminal on the first RRU, but does not feed back a random access response message to the second terminal other than the first terminal; this application, combined with the special characteristics of cell networking, identifies colliding terminals that send the same preamble, determines the set of RRUs to which the first terminal with a higher probability of successful random access, feeds back a random access message to the first terminal but not to the second terminal, so that the second terminal within the coverage area of ​​other RRUs can know in time that the random access has failed, reducing user access latency and network interference.

[0099] Optionally, the set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined through the following steps:

[0100] When the multi-RRU merging cell is established, the initial set of neighboring RRUs for each RRU in the multi-RRU merging cell is determined;

[0101] During the operation of the cell network, the set of neighboring RRUs for each RRU is updated based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information.

[0102] Specifically, for the set of neighboring RRUs for each RRU in a multi-RRU merging cell, the initial set of neighboring RRUs for each RRU in the multi-RRU merging cell can be determined when the multi-RRU merging cell is established, and then continuously updated during the operation of the cell network based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information.

[0103] The adjacency relationships between each RRU and different RRUs within a multi-RRU merging cell can be represented as a list. From this list, the set of neighboring RRUs for each RRU can be obtained.

[0104] Optionally, determining the initial set of neighboring RRUs for each RRU within the multi-RRU merging cell includes:

[0105] The initial set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined to include all other RRUs within the multi-RRU merging cell; or,

[0106] Based on the relative positional relationship of each RRU within the multi-RRU merged cell, the initial set of neighboring RRUs for each RRU within the multi-RRU merged cell is determined.

[0107] Specifically, there are two ways to determine the initial set of neighboring RRUs for each RRU within a multi-RRU merging cell:

[0108] Method 1: When establishing a multi-RRU merged cell, set the neighboring RRU set of each RRU to all RRUs except itself.

[0109] Method 2: When establishing a multi-RRU merged cell, the initial adjacency relationship of the RRUs is determined based on their relative positions. Each RRU's initial set of adjacent RRUs includes all actually adjacent RRUs. The relative positional relationship between RRUs can be determined by whether their coverage areas overlap. Within a multi-RRU merged cell, if two RRUs have overlapping coverage areas, they are considered adjacent; if their coverage areas do not overlap at all, they are considered non-adjacent.

[0110] Figure 3 This is a schematic diagram illustrating the arrangement of all RRUs within a multi-RRU merging cell provided in this application embodiment, as shown below. Figure 3 As shown, in the scenario of cell merging with N=6 RRUs, the 6 RRUs are numbered R1-R6. R1 is adjacent to R2 and R4; R2 is adjacent to R1, R3, and R5; R3 is adjacent to R2 and R6; R4 is adjacent to R1 and R5; R5 is adjacent to R2, R4, and R6; and R6 is adjacent to R3 and R5. The initial RRU adjacency table is shown in Table 1.

[0111] Table 1: Initial RRU Adjacency Relationship Table for Multiple RRU Merging Cells

[0112]

[0113] During the operation of the cell network, the RRU adjacency table can be continuously and adaptively updated.

[0114] Optionally, updating the set of neighboring RRUs for each RRU based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information includes:

[0115] Within the multi-RRU merged cell, the received power and / or signal-to-noise ratio of the connected terminal on each RRU at the current time are measured, and the RRU corresponding to the maximum value of the received power or signal-to-noise ratio is determined as the target RRU, and the connected terminal corresponding to the target terminal is determined as the target terminal.

[0116] Determine whether the relationship between the received power and / or signal-to-noise ratio of all other RRUs (excluding the target RRU) when receiving the target terminal information and the maximum value satisfies a preset condition;

[0117] Increment the counter corresponding to the RRU that meets the preset conditions by 1;

[0118] The set of neighboring RRUs of the target RRU is updated based on the change values ​​of the counters corresponding to each RRU within a preset time or a preset number of statistical counts.

[0119] Specifically, the RRU adjacency relationship within a multi-RRU merged cell is updated by measuring the received power and / or signal-to-noise ratio of the currently connected terminal on each RRU, determining the maximum value of the received power and / or signal-to-noise ratio, and using the corresponding RRU as the target RRU and the corresponding connected terminal as the target terminal.

[0120] Then, it is determined whether the relationship between the received power and / or signal-to-noise ratio (SNR) of all other RRUs (excluding the target RRU) when receiving information from the target terminal and the aforementioned maximum value meets a preset condition. For example, a threshold value is determined based on this maximum value, and it is determined whether the received power and / or SNR corresponding to each RRU is greater than this threshold value. Another example is determining whether the difference between the received power and / or SNR corresponding to each RRU and this maximum value is less than the required threshold value. If the preset condition is met, the counter corresponding to the RRU is incremented by 1.

[0121] Within a preset time period or a preset number of statistical counts, the set of neighboring RRUs of the target RRU is updated based on the change values ​​of the counters corresponding to each RRU. For example, referring to Table 1 above, if R1 is the target RRU and the counter corresponding to R5 increases within time T, then R5 is added to the set of neighboring RRUs of R1.

[0122] Below is a specific example of updating RRU adjacency relationships:

[0123] ① In a multi-RRU merged cell, measure the received power and / or signal-to-noise ratio of each terminal in the connected state at the current time on each RRU. For each RRU, sort them in descending order according to the received power and / or signal-to-noise ratio of terminals in different connected states. Determine the RRU corresponding to the maximum value of received power and / or signal-to-noise ratio as the target RRU, numbered Ri, and the corresponding connected terminal as the target terminal.

[0124] ② Define a counter for each RRU other than the target RRU Ri, and set the initial value to 0.

[0125] ③ Determine whether the difference between the received power and / or signal-to-noise ratio of other RRUs when receiving target terminal information and the aforementioned maximum value is less than the threshold value, or, based on the maximum value, take a smaller value as the threshold value and determine whether the received power and / or signal-to-noise ratio of other RRUs when receiving target terminal information is higher than the threshold value.

[0126] ④ If the condition in ③ is met, the counter value of the corresponding RRU is incremented by 1.

[0127] ⑤ If the value of the RRU counter is greater than 0 within time T or within n counts, then these RRUs are stored in the set of adjacent RRUs of RRU Ri.

[0128] The random access response method provided in this application provides a basis for subsequent judgment on whether a preamble collision has occurred and for filtering the RRU to which the first terminal belongs by using a pre-defined set of adjacent RRUs corresponding to each RRU in a multi-RRU merging cell. It also provides a scheme for determining or updating the set of adjacent RRUs for different RRUs, thereby reducing user access latency and network interference levels.

[0129] Optionally, the method further includes:

[0130] The uplink transmission advance is determined based on the uplink signal received from the RRU set to which the first terminal belongs, and the uplink transmission advance is sent to the first terminal.

[0131] Specifically, in addition to sending a random access response message to the first terminal from the RRU set to which the first terminal belongs, a remeasured uplink transmission advance can also be sent to the first terminal. This uplink transmission advance is obtained by remeasurement based on the uplink signals received from the RRU set to which the first terminal belongs, rather than by measuring the uplink signals received from all RRUs to which the preamble belongs.

[0132] Optionally, the method further includes:

[0133] Receive a random access request resent by the second terminal after it has not received a random access response message within a preset time after sending the random access request.

[0134] Specifically, for the second terminal, since it does not receive a random access response message (MSG2) within a preset time after sending a random access request (MSG1), it re-initiates random access. During the MSG2 stage, the second terminal can already know that the random access has failed, and will not send the subsequent MSG3, thus promptly re-initiating random access, avoiding the impact of preamble collision, and reducing access latency and network interference.

[0135] The network device receives a resent random access request from the second terminal after it has not received a random access response message within a preset time after sending the random access request, and completes the subsequent random access process.

[0136] The random access response method provided in this application, after receiving the random access preamble sent by the terminal through PRACH resources, selects the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU; compares the obtained set of neighboring RRUs of the first RRU in the multi-RRU merging cell with all RRUs to which the preamble belongs, and deletes the second RRUs that are not in the set of neighboring RRUs of the first RRU among all RRUs to which the preamble belongs; then, feeds back a random access response message to the first terminal on the first RRU, but does not feed back a random access response message to the second terminal other than the first terminal. This application, combined with the special characteristics of cell networking, identifies colliding terminals that send the same preamble, determines the set of RRUs to which the first terminal with a higher probability of successful random access, feeds back a random access message to the first terminal but not to the second terminal, so that the second terminal within the coverage area of ​​other RRUs can know in time that the random access has failed, thereby reducing user access latency and network interference.

[0137] The following uses Table 1 as an example, combined with... Figure 3 The technical solutions provided in the embodiments of this application will be further described below.

[0138] ①UE1 is located at the boundary between R1 and R2, and UE2 is located in the coverage area of ​​R6. UE1 and UE2 randomly selected the same preamble for access.

[0139] ②Based on the antenna selection results assigned to the user, the BBU determines the RRUs to which the PRACH signal belongs, including R1, R2, and R6. Based on R1, R2, and R6, PRACH detection is performed to obtain the preamble.

[0140] ③ Compare the received power and / or signal-to-noise ratio of R1, R2 and R6 in the network equipment, and determine that R1 has the highest received power and / or signal-to-noise ratio, that is, R1 is the first RRU.

[0141] ④ Obtain the set of neighboring RRUs for R1, including R2 and R4. Compare this set with all RRUs to which PRACH belongs, and find that R6 is a non-neighboring RRU of R1, i.e., R6 is the second RRU. Simultaneously, determine that a terminal in the coverage area of ​​R6 is making a random access request.

[0142] ⑤ Under R1 and R2, send MSG2 to UE1. Do not send MSG2 to UE2 under R6.

[0143] ⑥If UE2 does not receive feedback from MSG2 within the specified time after sending MSG1, it will re-initiate random access.

[0144] Figure 4 This is a schematic diagram of the network device provided in the embodiments of this application, such as... Figure 4 As shown, the network device includes a memory 401, a transceiver 402, and a processor 403, wherein:

[0145] The memory 401 is used to store computer programs; the transceiver 402 is used to send and receive data under the control of the processor 403.

[0146] Specifically, transceiver 402 is used to receive and send data under the control of processor 403.

[0147] Among them, Figure 4 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits together, represented by one or more processors (processor 403) and memory (memory 401). The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 402 can be multiple elements, including transmitters and receivers, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical fibers, etc. The processor 403 is responsible for managing the bus architecture and general processing, and the memory 401 can store data used by the processor 403 during operation.

[0148] The processor 403 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor can also adopt a multi-core architecture.

[0149] Processor 403 is configured to read the computer program in the memory 401 and perform the following operations:

[0150] The receiving terminal uses the random access preamble sent by the PRACH resource to determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal.

[0151] The neighboring RRU set of the first RRU is determined based on the neighboring RRU set of each RRU in the multi-RRU merging cell;

[0152] Delete the second RRU that is not in the set of adjacent RRUs of the first RRU among all RRUs to which the preamble belongs, and obtain the set of RRUs to which the first terminal belongs within the coverage area of ​​the first RRU.

[0153] The system sends a random access response message to the first terminal on the RRU set to which the first terminal belongs, but does not send a random access response message to the second terminal within the coverage area of ​​the second RRU.

[0154] Optionally, the set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined through the following steps:

[0155] When the multi-RRU merging cell is established, the initial set of neighboring RRUs for each RRU in the multi-RRU merging cell is determined;

[0156] During the operation of the cell network, the set of neighboring RRUs for each RRU is updated based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information.

[0157] Optionally, determining the initial set of neighboring RRUs for each RRU within the multi-RRU merging cell includes:

[0158] The initial set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined to include all other RRUs within the multi-RRU merging cell; or,

[0159] Based on the relative positional relationship of each RRU within the multi-RRU merged cell, the initial set of neighboring RRUs for each RRU within the multi-RRU merged cell is determined.

[0160] Optionally, updating the set of neighboring RRUs for each RRU based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information includes:

[0161] Within the multi-RRU merged cell, the received power and / or signal-to-noise ratio of the connected terminal on each RRU at the current time are measured, and the RRU corresponding to the maximum value of the received power or signal-to-noise ratio is determined as the target RRU, and the connected terminal corresponding to the target terminal is determined as the target terminal.

[0162] Determine whether the relationship between the received power and / or signal-to-noise ratio of all other RRUs (excluding the target RRU) when receiving the target terminal information and the maximum value satisfies a preset condition;

[0163] Increment the counter corresponding to the RRU that meets the preset conditions by 1;

[0164] The set of neighboring RRUs of the target RRU is updated based on the change values ​​of the counters corresponding to each RRU within a preset time or a preset number of statistical counts.

[0165] Optionally, the operation further includes:

[0166] The uplink transmission advance is determined based on the uplink signal received from the RRU set to which the first terminal belongs, and the uplink transmission advance is sent to the first terminal.

[0167] Optionally, the operation further includes:

[0168] Receive a random access request resent by the second terminal after it has not received a random access response message within a preset time after sending the random access request.

[0169] It should be noted that the network device provided in this embodiment of the invention can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0170] Figure 5 This is a schematic diagram of the structure of the random access response device provided in the embodiments of this application, as shown below. Figure 5 As shown, the device includes:

[0171] The receiving module 501 is used to receive the random access preamble sent by the terminal through the PRACH resource, and determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal.

[0172] The determining module 502 is used to determine the neighboring RRU set of the first RRU based on the neighboring RRU set of each RRU in the multi-RRU merging cell;

[0173] The deletion module 503 is used to delete the second RRU that does not belong to the first RRU in the set of adjacent RRUs among all RRUs to which the preamble belongs, so as to obtain the set of RRUs to which the first terminal belongs within the coverage area of ​​the first RRU.

[0174] The first sending module 504 is used to send a random access response message to the first terminal on the RRU set to which the first terminal belongs, and not to send a random access response message to the second terminal in the coverage area of ​​the second RRU.

[0175] Optionally, the determining module is further configured to:

[0176] When the multi-RRU merging cell is established, the initial set of neighboring RRUs for each RRU in the multi-RRU merging cell is determined;

[0177] During the operation of the cell network, the set of neighboring RRUs for each RRU is updated based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information.

[0178] Optionally, the determining module is further configured to:

[0179] The initial set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined to include all other RRUs within the multi-RRU merging cell; or,

[0180] Based on the relative positional relationship of each RRU within the multi-RRU merged cell, the initial set of neighboring RRUs for each RRU within the multi-RRU merged cell is determined.

[0181] Optionally, the determining module is further configured to:

[0182] Within the multi-RRU merged cell, the received power and / or signal-to-noise ratio of the connected terminal on each RRU at the current time are measured, and the RRU corresponding to the maximum value of the received power or signal-to-noise ratio is determined as the target RRU, and the connected terminal corresponding to the target terminal is determined as the target terminal.

[0183] Determine whether the relationship between the received power and / or signal-to-noise ratio of all other RRUs (excluding the target RRU) when receiving the target terminal information and the maximum value satisfies a preset condition;

[0184] Increment the counter corresponding to the RRU that meets the preset conditions by 1;

[0185] The set of neighboring RRUs of the target RRU is updated based on the change values ​​of the counters corresponding to each RRU within a preset time or a preset number of statistical counts.

[0186] Optionally, the device further includes:

[0187] The second transmission module is used to determine the uplink transmission advance based on the uplink signal received from the RRU set to which the first terminal belongs, and to send the uplink transmission advance to the first terminal.

[0188] Optionally, the device further includes:

[0189] The receiving module is used to receive the random access request resent by the second terminal after it has not received a random access response message within a preset time after sending the random access request.

[0190] The methods and apparatuses provided in the various embodiments of this application are based on the same concept. Since the methods and apparatuses solve problems in similar ways, the implementations of the apparatuses and methods can refer to each other, and repeated details will not be repeated.

[0191] It should be noted that the division of units in the embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0192] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0193] It should be noted that the apparatus provided in this application embodiment can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0194] On the other hand, embodiments of this application also provide a processor-readable storage medium storing a computer program for causing the processor to execute the random access response methods provided in the above embodiments, such as including:

[0195] The receiving terminal uses the random access preamble sent by the PRACH resource to determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal.

[0196] The neighboring RRU set of the first RRU is determined based on the neighboring RRU set of each RRU in the multi-RRU merging cell;

[0197] Delete the second RRU that is not in the set of adjacent RRUs of the first RRU among all RRUs to which the preamble belongs, and obtain the set of RRUs to which the first terminal belongs within the coverage area of ​​the first RRU.

[0198] The system sends a random access response message to the first terminal on the RRU set to which the first terminal belongs, but does not send a random access response message to the second terminal within the coverage area of ​​the second RRU.

[0199] The processor-readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO)), optical memory (e.g., CD, DVD, BD, HVD), and semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)).

[0200] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0201] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0202] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0203] These processors can execute instructions that can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0204] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A random access response method, characterized in that, include: The receiving terminal uses the random access preamble sent by the PRACH resource to determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal. The neighboring RRU set of the first RRU is determined based on the neighboring RRU set of each RRU in the multi-RRU merging cell; Delete the second RRU that is not in the set of adjacent RRUs of the first RRU among all RRUs to which the preamble belongs, and obtain the set of RRUs to which the first terminal belongs within the coverage area of ​​the first RRU. The system sends a random access response message to the first terminal on the RRU set to which the first terminal belongs, but does not send a random access response message to the second terminal within the coverage area of ​​the second RRU.

2. The random access response method according to claim 1, characterized in that, The set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined through the following steps: When the multi-RRU merging cell is established, the initial set of neighboring RRUs for each RRU in the multi-RRU merging cell is determined; During the operation of the cell network, the set of neighboring RRUs for each RRU is updated based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information.

3. The random access response method according to claim 2, characterized in that, Determining the initial set of neighboring RRUs for each RRU within the multi-RRU merging cell includes: The initial set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined to include all other RRUs within the multi-RRU merging cell; or, Based on the relative positional relationship of each RRU within the multi-RRU merged cell, the initial set of neighboring RRUs for each RRU within the multi-RRU merged cell is determined.

4. The random access response method according to any one of claims 2 or 3, characterized in that, The step of updating the neighboring RRU set of each RRU based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information includes: Within the multi-RRU merged cell, the received power and / or signal-to-noise ratio of the connected terminal on each RRU at the current time are measured, and the RRU corresponding to the maximum value of the received power or signal-to-noise ratio is determined as the target RRU, and the connected terminal corresponding to the target terminal is determined as the target terminal. Determine whether the relationship between the received power and / or signal-to-noise ratio of all other RRUs (excluding the target RRU) when receiving the target terminal information and the maximum value satisfies a preset condition; Increment the counter corresponding to the RRU that meets the preset conditions by 1; The set of neighboring RRUs of the target RRU is updated based on the change values ​​of the counters corresponding to each RRU within a preset time or a preset number of statistical counts.

5. The random access response method according to claim 1, characterized in that, The method further includes: The uplink transmission advance is determined based on the uplink signal received from the RRU set to which the first terminal belongs, and the uplink transmission advance is sent to the first terminal.

6. The random access response method according to claim 1, characterized in that, The method further includes: Receive a random access request resent by the second terminal after it has not received a random access response message within a preset time after sending the random access request.

7. A network device, comprising a memory, a transceiver, and a processor; characterized in that: A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: The receiving terminal uses the random access preamble sent by the PRACH resource to determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal. The neighboring RRU set of the first RRU is determined based on the neighboring RRU set of each RRU in the multi-RRU merging cell; Delete the second RRU that is not in the set of adjacent RRUs of the first RRU among all RRUs to which the preamble belongs, and obtain the set of RRUs to which the first terminal belongs within the coverage area of ​​the first RRU. The system sends a random access response message to the first terminal on the RRU set to which the first terminal belongs, but does not send a random access response message to the second terminal within the coverage area of ​​the second RRU.

8. The network device according to claim 7, characterized in that, The set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined through the following steps: When the multi-RRU merging cell is established, the initial set of neighboring RRUs for each RRU in the multi-RRU merging cell is determined; During the operation of the cell network, the set of neighboring RRUs for each RRU is updated based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information.

9. The network device according to claim 8, characterized in that, Determining the initial set of neighboring RRUs for each RRU within the multi-RRU merging cell includes: The initial set of neighboring RRUs for each RRU within the multi-RRU merging cell is determined to include all other RRUs within the multi-RRU merging cell; or, Based on the relative positional relationship of each RRU within the multi-RRU merged cell, the initial set of neighboring RRUs for each RRU within the multi-RRU merged cell is determined.

10. The network device according to any one of claims 8 or 9, characterized in that, The step of updating the neighboring RRU set of each RRU based on the received power and / or signal-to-noise ratio when each RRU receives the same terminal information includes: Within the multi-RRU merged cell, the received power and / or signal-to-noise ratio of the connected terminal on each RRU at the current time are measured, and the RRU corresponding to the maximum value of the received power or signal-to-noise ratio is determined as the target RRU, and the connected terminal corresponding to the target terminal is determined as the target terminal. Determine whether the relationship between the received power and / or signal-to-noise ratio of all other RRUs (excluding the target RRU) when receiving the target terminal information and the maximum value satisfies a preset condition; Increment the counter corresponding to the RRU that meets the preset conditions by 1; The set of neighboring RRUs of the target RRU is updated based on the change values ​​of the counters corresponding to each RRU within a preset time or a preset number of statistical counts.

11. The network device according to claim 7, characterized in that, The operation also includes: The uplink transmission advance is determined based on the uplink signal received from the RRU set to which the first terminal belongs, and the uplink transmission advance is sent to the first terminal.

12. The network device according to claim 7, characterized in that, The operation also includes: Receive a random access request resent by the second terminal after it has not received a random access response message within a preset time after sending the random access request.

13. A random access response device, characterized in that, include: The receiving module is used to receive the random access preamble sent by the terminal through the PRACH resource, and determine the RRU with the highest received power and / or signal-to-noise ratio among all RRUs to which the preamble belongs as the first RRU. The terminal includes a first terminal and a second terminal. The determination module is used to determine the neighboring RRU set of the first RRU based on the neighboring RRU set of each RRU in the multi-RRU merging cell; The deletion module is used to delete the second RRU that does not belong to the first RRU from all RRUs to which the preamble belongs, and obtain the RRU set to which the first terminal belongs within the coverage area of ​​the first RRU. The sending module is configured to send a random access response message to the first terminal on the RRU set to which the first terminal belongs, but not to send a random access response message to the second terminal within the coverage area of ​​the second RRU.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that causes a computer to perform the method according to any one of claims 1 to 6.

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