Adaptive dual-mode DU and RU management plane communication method

Abstract

The invention discloses a self-adaptive dual-mode DU and RU management plane communication method, which comprises the following steps: S1, dynamically allocating an IP address of equipment through CPRI control words Z.16.1 and Z.16.2, including a single-DU deployment mode and a dual-DU deployment mode; s2, configuring a unified RU port state machine, adaptively identifying a network topology and establishing an optimal connection; and S3, two physical topological structures of a DU internal ring and a double-DU external ring are constructed, RU active connection management is completed based on a Netconf Call Home mechanism, and when a link fault is detected, a standby path is automatically switched to reestablish management connection. According to the invention, a unified management plane architecture adaptive to single-DU and double-DU deployment scenes is constructed, zero-configuration deployment and millisecond-level fault recovery are realized, and service continuity is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to an adaptive dual-mode DU and RU management plane communication method. Background Technology

[0002] In 5G and future mobile communication networks, the separation architecture of DU (Distributed Unit) and RU (Radio Unit) has become mainstream. In existing technologies, the CPRI protocol is mainly used for transmitting user plane data, while the management plane typically relies on a separately configured network. This architecture presents the following problems in deployment scenarios of different scales: 1. When deploying small sites, configuring a separate management network for the RU will significantly increase costs and complexity.

[0003] 2. Under the high reliability requirements of large sites, traditional management plane switching mechanisms are complex and have long recovery times.

[0004] 3. RU devices are geographically dispersed, making manual IP address configuration prone to errors and maintenance difficult.

[0005] 4. Different management architectures are required for sites of different sizes, which increases the complexity of equipment types and operation and maintenance.

[0006] 5. When fiber optic cables break or multiple points of failure occur, the management topology cannot be quickly reconstructed.

[0007] In summary, existing technologies lack a unified management plane communication architecture that can adapt to single-DU and dual-DU deployment scenarios and has rapid self-healing capabilities. This problem is becoming increasingly prominent, especially given the growing demand for differentiated deployments based on site size. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides an adaptive dual-mode DU and RU management plane communication method. By utilizing the CPRI control word to dynamically allocate IP addresses and combining it with the Netconf Call Home mechanism, a unified management architecture is constructed that supports both single-DU ring self-healing and dual-DU primary / backup collaborative working modes. This significantly improves the reliability, automation, and resource efficiency of network management in deployment scenarios of different scales.

[0009] This invention provides an adaptive dual-mode DU and RU management plane communication method, the specific technical solution of which is as follows: S1: Dynamically allocate device IP addresses through CPRI control words Z.16.1 and Z.16.2, including both single DU and dual DU deployment modes; S2: Configure a unified RU port state machine to adaptively identify the network topology and establish the optimal connection; the RU device adopts an adaptive port state mechanism, in which all DU ports are fixedly configured in the Master state; S3: Construct two physical topologies: an internal ring within the DU and an external ring between two DUs. Based on the Netconf Call Home mechanism, the RU actively manages the connection. The RU calculates the corresponding DU management IP address by resolving the CPRI control word and actively initiates a Netconf Call Home to connect to port 4334 of the DU. When a link failure is detected, it automatically switches to the backup path to rebuild the management connection.

[0010] Furthermore, the DU port IP address format is 10.{SlotNum}.100.1 / 16; SlotNum is the slot number where the baseband board is located; The RU port IP address format is 10.XYZ / 16, where X is the high 4 bits of the CPRI control word Z.16.1 representing the upstream DU slot number, Y is the low 4 bits of Z.16.1 representing the upstream DU port number, and Z is Z.16.2 representing the cascading level.

[0011] Furthermore, the IP allocation process for a single DU deployment mode is as follows: After the first distribution unit starts up, it sets the control word of the zeroth optical interface of the first distribution unit based on the slot number and port number. The zeroth optical interface of the first radio frequency unit receives the control word and generates an Internet Protocol address based on the control word parsing result. Then, it passes the incremented control word downstream to complete the Internet Protocol address allocation of each level of radio frequency unit. When the main link fails, the first optical interface of the first distribution unit is activated and the control word is reset based on the updated port number, so that the downstream radio frequency unit can obtain the Internet Protocol address from the backup link again.

[0012] Furthermore, the IP allocation process for the dual-DU deployment mode is as follows: After the first distribution unit starts up, the control word of the zeroth optical interface of the first distribution unit is set based on the slot number and port number. Internet Protocol (IP) addresses are allocated to each level of radio frequency (RF) unit through the main link in sequence. When the first distribution unit fails, the first optical interface of the second distribution unit is activated and the control word is reset based on the updated slot number and port number. The tail radio frequency unit receives the control word from the backup link and generates a new IP address. Then, the incremented control word is passed upstream level by level to complete the IP address reallocation of each level of radio frequency unit, so as to achieve seamless takeover by the backup distribution unit.

[0013] Furthermore, the RU port state machine is configured as follows: The optical port that has successfully established a CPRI link with the upstream device will be automatically set to Slave state; the other optical port will be automatically configured to Master state to attempt to establish a connection with the downstream device; CPRI connections will be prohibited between the two Master state ports. Furthermore, the RU port state machine configuration also includes: when neither of the two optical ports has initially established a link, a polling mechanism is started to set each optical port to the Slave state and attempt to establish a link in turn; when the existing CPRI link fails, the port state is automatically re-evaluated and an attempt is made to rebuild the connection from the backup path.

[0014] Furthermore, the internal ring topology of the DU starts and ends with the first distribution unit, and forms a closed ring topology through sequentially connected RUs at each level.

[0015] Furthermore, in single DU mode, the automatic switch to the backup path to rebuild the management connection specifically includes: When the primary optical port of the DU fails, the management plane communication is switched to the backup optical port to rebuild the ring topology; when the optical fiber between adjacent radio frequency units is interrupted, the RUs on both sides of the break point are connected to the two optical ports of the DU to form two sub-ring topologies; when the DU equipment fails, alarm information is generated and manual intervention is awaited to ensure that the data transmission of the service plane is not interrupted.

[0016] Furthermore, the dual-DU external ring topology, starting from the first distribution unit and ending at the second distribution unit, forms an open-loop link topology through sequentially connected RUs at each level.

[0017] 10. The adaptive dual-mode DU and RU management plane communication method according to claim 9, characterized in that, in dual-DU mode, the automatic switching to the backup path to rebuild the management connection specifically includes: When the primary optical port or link fails, switch to the backup link to maintain the management plane connection; when the first distribution unit equipment fails, activate the second distribution unit and switch to the active state, trigger RU address reallocation and connection reconstruction, and realize full takeover of management functions; when the fiber between adjacent RUs is interrupted, switch the downstream RU of the interruption point to the second distribution unit to form two independent management domains and maintain the accessibility of the management plane of all radio frequency units.

[0018] The beneficial effects of this invention are as follows: 1. This invention improves the reliability, automation, and resource efficiency of network management in deployment scenarios of different scales by constructing a unified management architecture that supports both single-DU ring self-healing and dual-DU primary / standby collaborative working modes. This architecture simultaneously supports both small single-DU sites and large dual-DU sites, reducing equipment types and R&D costs, and avoiding the problem of requiring different management architectures for sites of different sizes.

[0019] 2. This invention reduces manual configuration workload and shortens single-site deployment time through a zero-configuration mechanism that dynamically allocates IP addresses using the CPRI control word. It also solves the problems of error-prone manual configuration and difficult maintenance caused by the geographically dispersed nature of RU devices. Through the combination of dual-mode physical topology and an automatic switching mechanism, millisecond-level fault recovery is achieved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the method flow of the present invention.

[0021] Figure 2 This is a schematic diagram of the topology of the single DU loop after establishing a link from the L-Master according to the present invention.

[0022] Figure 3 This is a schematic diagram of the topology of the single DU loop after establishing a link on the L-Slave according to the present invention.

[0023] Figure 4 This is a schematic diagram of the topology of the single DU loop after it is disconnected from the middle of the RU in this invention.

[0024] Figure 5 This is a schematic diagram of the topology of the dual DU loop after establishing a link on the L-Master according to the present invention.

[0025] Figure 6 This is a schematic diagram of the topology of the dual DU loop after establishing a link on the L-Slave according to the present invention.

[0026] Figure 7 This is a schematic diagram of the topology of the dual DU loop of the present invention after it is disconnected from the middle of the RU.

[0027] Figure 8 This is a timing diagram of chain establishment on the L-Master of the present invention. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention are clearly and completely described in the following description. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use, or the orientation or positional relationship in which those skilled in the art conventionally understand it, and is only for the convenience of describing the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0031] Example 1 Embodiment 1 of the present invention discloses an adaptive dual-mode DU and RU management plane communication method, such as... Figure 1 As shown, the details are as follows: S1: Dynamically allocate device IP addresses through CPRI control words Z.16.1 and Z.16.2, including both single DU and dual DU deployment modes; The DU port IP address format is 10.{SlotNum}.100.1 / 16; SlotNum is the slot number of the baseband board. The RU port IP address format is 10.XYZ / 16, where X is the high 4 bits of the CPRI control word Z.16.1 representing the upstream DU slot number, Y is the low 4 bits of Z.16.1 representing the upstream DU port number, and Z is Z.16.2 representing the cascading level.

[0032] Specifically, the hardware configuration of DU is as follows: Single DU mode: The system includes a DU baseband board (DU-1); The DU-1 is equipped with two optical interfaces that serve as both primary and backup: DU-1-OPT0 (primary) and DU-1-OPT1 (backup). Both optical ports are configured as Master ports, but have different priorities.

[0033] Dual DU mode: The system consists of two DU baseband boards that serve as both primary and backup: DU-1 and DU-2; DU-1 is installed in slot 1 of the frame, and DU-2 is installed in slot 2 of the frame; Each DU baseband board is equipped with two optical interfaces: DU-1-OPT0, DU-1-OPT1 and DU-2-OPT0, DU-2-OPT1; The two DUs maintain state synchronization, and when the primary DU fails, the backup DU can seamlessly take over all management functions.

[0034] The hardware configuration of the RU is as follows: At least three RU devices, designated RU-1, RU-2, and RU-3; Each RU device is equipped with two optical interfaces, denoted as RU-x-OPT0 and RU-x-OPT1, where x is the RU number; The RU device has a built-in CPRI link monitoring module, which can detect changes in link status in real time and trigger a self-healing mechanism.

[0035] As a preferred embodiment, the IP allocation process for the single DU deployment mode is as follows: like Figure 8 As shown, after the first distribution unit starts, the control word of the zeroth optical interface of the first distribution unit is set based on the slot number and port number. The zeroth optical interface of the first radio frequency unit receives the control word, parses the slot information, port information, and hierarchical information required to generate the Internet Protocol (IP) address based on the control word, generates the IP address, and then increments the hierarchical information level by level and passes the control word downstream, completing the IP address allocation for each level of radio frequency unit in sequence, until the address allocation for all radio frequency units is completed; as shown Figure 3 As shown, when the main link fails, the first optical interface of the first distribution unit is activated, the control word is reset based on the updated port number, and the downstream radio frequency unit obtains the Internet Protocol address from the backup link to complete the address reallocation.

[0036] Specifically, after DU-1 (the first distribution unit) is started, the control word Z.16.1=0x10 and Z.16.2=1 are set in DU-1-OPT0 (the zeroth optical interface of the first distribution unit); RU-1-OPT0 (the zeroth optical interface of the first radio frequency unit) receives the control word, generates IP 10.1.0.1 / 16, and then increments Z.16.2 to 2, and transmits it from RU-1-OPT1 (the first optical interface of the first radio frequency unit); RU-2-OPT0 (the zeroth optical interface of the second radio frequency unit) receives the control word, generates IP 10.1.0.2 / 16, and then increments Z.16.2 to 3, and transmits it from RU-2-OPT1 (the first optical interface of the second radio frequency unit); And so on, until the last RU; When the L-Master fails, DU-1-OPT1 (the first optical interface of the first distribution unit) is activated, and the control word Z.16.1=0x11 and Z.16.2=1 is set. The downstream RU obtains an IP address again from the backup path.

[0037] As a preferred embodiment, the IP allocation process for the dual-DU deployment mode is as follows: After the first distribution unit starts up, the control word of the zeroth optical interface of the first distribution unit is set based on the slot number and port number. Internet Protocol (IP) addresses are then allocated to each level of radio frequency (RF) unit sequentially via the main link. Each RF unit generates an IP address containing the slot information of the first distribution unit based on the control word parsing result, until address allocation for all RF units is completed; for example... Figure 6 As shown, when the first distribution unit fails, the first optical interface of the second distribution unit is activated, and the control word is reset based on the updated slot number and port number. The tail radio frequency unit receives the control word from the backup link and generates an Internet Protocol address based on the new slot information. Then, the hierarchical information is incremented level by level and the control word is transmitted upstream. The Internet Protocol address reassignment of each level of upstream radio frequency unit is completed in sequence until the address reassignment of all radio frequency units is completed, so as to realize the seamless takeover of management functions by the backup distribution unit.

[0038] Specifically, after DU-1 (the first distribution unit) is started, the control word Z.16.1=0x10 and Z.16.2=1 are set in DU-1-OPT0 (the zeroth optical interface of the first distribution unit); The L-Master assigns IP addresses to each RU sequentially: RU-1 (first radio unit) is 10.1.0.1 / 16, RU-2 (second radio unit) is 10.1.0.2 / 16, and RU-3 (third radio unit) is 10.1.0.3 / 16. When DU-1 (first distribution unit) fails, DU-2-OPT1 (first optical interface of the second distribution unit) is activated, and the control word Z.16.1=0x21 and Z.16.2=1 is set. RU-3-OPT1 (the first optical interface of the third radio frequency unit) receives the control word, generates IP 10.2.1.1 / 16, and then increments Z.16.2 to 2 and passes it upstream, thereby reallocating IP addresses to the upstream RUs in turn.

[0039] S2: Configure a unified RU port state machine to adaptively identify network topology and establish optimal connections; The RU device adopts an adaptive port state mechanism, in which all DU ports are fixed in the Master state; The optical port that has successfully established a CPRI link with the upstream device will be automatically set to Slave state; the other optical port will be automatically configured to Master state to attempt to establish a connection with the downstream device; CPRI connections will be prohibited between the two Master state ports to prevent loop oscillation.

[0040] The RU port state machine configuration also includes: when neither of the two optical ports has established a link initially, a polling mechanism is started to set each optical port to the Slave state and attempt to establish a link in turn; when the existing CPRI link fails, the port status is automatically re-evaluated and an attempt is made to rebuild the connection from the backup path.

[0041] S3: Construct two physical topologies: an internal ring within a DU and an external ring outside a double DU. As a preferred embodiment, such as Figure 2 As shown, the internal ring topology of DU is as follows: with the first distribution unit as the starting point and the ending point, a closed ring topology is formed by sequentially connecting each level of RU, that is, the closed loop of DU-1→RU-1→RU-2→…→RU-n→DU-1. Specifically, the physical connections are as follows: DU-1-OPT0 connects to RU-1-OPT0 (the starting point of the main line L-Master); RU-1-OPT1 connects to RU-2-OPT0; RU-2-OPT1 connects to RU-3-OPT0; RU-3-OPT1 connects to DU-1-OPT1 (the starting point of the backup line L-Slave).

[0042] like Figure 5 As shown, the external ring topology of the dual DU starts from the first distribution unit and ends at the second distribution unit. It forms an open-loop link topology through the sequential connection of each level of RU, that is, a unidirectional link of DU-1→RU-1→RU-2→…→RU-n→DU-2. Specifically, the physical connections are as follows: DU-1-OPT0 connects to RU-1-OPT0 (the starting point of the main line L-Master); RU-1-OPT1 connects to RU-2-OPT0; RU-2-OPT1 connects to RU-3-OPT0; DU-2-OPT1 connects to RU-3-OPT1 (the starting point of the backup line L-Slave).

[0043] The RU actively connects to the DU based on the Netconf Call Home mechanism. The RU calculates the corresponding DU management IP address by parsing the CPRI control word and actively initiates a Netconf Call Home to connect to the DU's port 4334. When a link failure is detected, the system automatically switches to the backup path to rebuild the management connection.

[0044] In a preferred embodiment, under single DU mode, the automatic switch to the backup path to rebuild the management connection specifically includes: When the primary optical port of the distribution unit fails, the link status change is detected, triggering the port switching mechanism to migrate the management plane communication from the primary optical port to the backup optical port. The CPRI protocol link with the RU is re-established through the backup optical port, the complete ring topology is rebuilt, and the management plane connection continuity is maintained. like Figure 4 As shown, when the optical fiber between adjacent RUs is interrupted, the location of the break point is detected, the RUs on both sides of the break point are identified, the downstream connection of the upstream RU of the break point is switched to the backup optical port of the DU, and the upstream connection of the downstream RU of the break point is switched to the main optical port of the DU, so that the original ring topology is split into two independent sub-ring topologies, which are managed by the two optical ports of the DU respectively, maintaining the accessibility of the management surface of the radio frequency units on both sides of the break point. When the DU device fails as a whole, the application layer heartbeat of the DU is detected to be out of time, the DU is determined to be unavailable, the device fault alarm information is generated, the topology status and service carrying status at the time of the fault are recorded, and the fault event is reported to the network management system, waiting for manual intervention and repair. Before the manual repair is completed, the service plane data transmission of the RU is kept uninterrupted.

[0045] In dual-DU mode, the automatic switch to the backup path to rebuild the management connection specifically includes: When the primary optical port or primary link of the DU fails, the link status change is detected, the fault type is identified as an optical port level fault, and the link switching mechanism is triggered to migrate the management plane communication from the primary link to the backup link. The CPRI protocol link with the RU is re-established through the backup link to maintain the management plane connection with the primary DU, or the backup DU takes over part of the management load. When the first distribution unit device fails as a whole, the application layer heartbeat timeout of the first distribution unit is detected, and the first distribution unit is determined to be unavailable. The first optical port of the second distribution unit is activated, and the second distribution unit is switched from standby to active state. The second distribution unit sends a control word to the tail RU through the backup link, triggering the RU's Internet Protocol address reallocation process. Each level of RU recalculates the DU management Internet Protocol address based on the new slot information and actively initiates a network configuration protocol active call home connection to the second distribution unit, completing a seamless switch of management plane control and realizing the full takeover of all management functions by the backup distribution unit. like Figure 7As shown, when the optical fiber between adjacent RUs is interrupted, the location of the break point is detected, the upstream and downstream RUs of the break point are identified, and the upstream connection of the downstream RU of the break point is switched to the second distribution unit. The second distribution unit manages the RU subset downstream of the break point, while the first distribution unit continues to manage the RU subset upstream of the break point, forming two independent management domains. The management surface accessibility of all radio frequency units is maintained. After the optical fiber is repaired, the management domains are automatically merged to restore the original topology.

[0046] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. An adaptive dual-mode DU and RU management plane communication method, characterized in that, include: S1: Dynamically allocate device IP addresses through CPRI control words Z.16.1 and Z.16.2, including both single DU and dual DU deployment modes; S2: Configure a unified RU port state machine to adaptively identify network topology and establish optimal connections; S3: Constructs two physical topologies: an internal ring within a DU and an external ring between two DUs. It performs active connection management of the RU based on the Netconf Call Home mechanism. When a link failure is detected, it automatically switches to the backup path to rebuild the management connection.

2. The adaptive dual-mode DU and RU management plane communication method according to claim 1, characterized in that, The DU port IP address format is 10.{SlotNum}.100.1 / 16; SlotNum is the slot number where the baseband board is located. The RU port IP address format is 10.XYZ / 16, where X is the high 4 bits of the CPRI control word Z.16.1 representing the upstream DU slot number, Y is the low 4 bits of Z.16.1 representing the upstream DU port number, and Z is Z.16.2 representing the cascading level.

3. The adaptive dual-mode DU and RU management plane communication method according to claim 2, characterized in that, The IP allocation process for a single DU deployment is as follows: After the first distribution unit starts up, it sets the control word of the zeroth optical interface of the first distribution unit based on the slot number and port number. The zeroth optical interface of the first radio frequency unit receives the control word and generates an Internet Protocol address based on the control word parsing result. Then, it passes the incremented control word downstream to complete the Internet Protocol address allocation of each level of radio frequency unit. When the main link fails, the first optical interface of the first distribution unit is activated and the control word is reset based on the updated port number, so that the downstream radio frequency unit can obtain the Internet Protocol address from the backup link again.

4. The adaptive dual-mode DU and RU management plane communication method according to claim 2, characterized in that, The IP allocation process for dual-DU deployment mode is as follows: After the first distribution unit starts up, it sets the control word of the zeroth optical interface of the first distribution unit based on the slot number and port number, and allocates Internet Protocol addresses to each level of radio frequency unit through the main link in sequence. When the first distribution unit fails, the first optical interface of the second distribution unit is activated and the control word is reset based on the updated slot number and port number. The tail radio frequency unit receives the control word from the backup link and generates a new Internet Protocol address. Then, it passes the incremented control word upstream level by level to complete the Internet Protocol address redistribution of each level of radio frequency unit.

5. The adaptive dual-mode DU and RU management plane communication method according to claim 1, characterized in that, The RU port state machine configuration is as follows: The optical port that has successfully established a CPRI link with the upstream device will be automatically set to Slave state; the other optical port will be automatically configured to Master state to attempt to establish a connection with the downstream device; CPRI connections will be prohibited between the two Master state ports.

6. The adaptive dual-mode DU and RU management plane communication method according to claim 5, characterized in that, The RU port state machine configuration also includes: when neither of the two optical ports has established a link initially, a polling mechanism is started to set each optical port to the Slave state and attempt to establish a link in turn; when the existing CPRI link fails, the port status is automatically re-evaluated and the connection is rebuilt from the backup path.

7. The adaptive dual-mode DU and RU management plane communication method according to claim 1, characterized in that, The internal ring topology of the DU starts and ends with the first distribution unit, and forms a closed ring topology through sequentially connected RUs at each level.

8. The adaptive dual-mode DU and RU management plane communication method according to claim 7, characterized in that, In single DU mode, the automatic switch to the backup path to rebuild the management connection specifically includes: When the primary optical port of the DU fails, the management plane communication is switched to the backup optical port to rebuild the ring topology; when the optical fiber between adjacent radio frequency units is interrupted, the RUs on both sides of the break point are connected to the two optical ports of the DU to form two sub-ring topologies; when the DU equipment fails, alarm information is generated.

9. The adaptive dual-mode DU and RU management plane communication method according to claim 1, characterized in that, The dual-DU external ring topology, with the first distribution unit as the starting point and the second distribution unit as the ending point, forms an open-loop link topology through sequential cascading of RUs at each level.

10. The adaptive dual-mode DU and RU management plane communication method according to claim 9, characterized in that, In dual-DU mode, the automatic switch to the backup path to rebuild the management connection specifically includes: When the primary optical port or link fails, the system switches to the backup link to maintain the management plane connection. When the first distribution unit device fails, the second distribution unit is activated and switched to the active state, triggering RU address reallocation and connection reconstruction. When the fiber between adjacent RUs is interrupted, the downstream RU of the interruption point is switched to the second distribution unit, forming two independent management domains.

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