CN101159893B

CN101159893B - Distributed base station controller and its unit, data transmission method

Info

Publication number: CN101159893B
Application number: CN2007101300696A
Authority: CN
Inventors: 谢寿波; 赵宏宇; 尹树成; 钟浩明; 张春; 李帅兵
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-03-31
Filing date: 2007-07-30
Publication date: 2010-04-21
Anticipated expiration: 2027-07-30
Also published as: CN101159893A; WO2008119295A1

Abstract

The invention discloses a distributed base station controller and a unit thereof and a data transmission method, wherein, the distributed base station controller includes a central unit and at least one pulling unit. The central unit is used to convert protocols of interactive signaling and business data between core network node and the pulling unit and perform operation processing in weak correlation with business for the pulling unit. The pulling unit is used to convert protocols of signaling and business data between the central unit and the base station, perform multi-drop merging and converging processing for received up data and sent to the central unit. When the pulling units are more than one, connect with the central unit respectively or in cascade connection with the central unit. The invention can realize flexible networking mode, deploy a SDU unit with multi-drop merging function in the distributed base station controller on a transmission converging node of wireless access network and improve the converging capability of the transmission converging node.

Description

Distributed base station controller, unit thereof and data transmission method

Technical Field

The present invention relates to the field of communications, and in particular, to a distributed base station controller, a central unit, a remote unit, and a data transmission method in a distributed base station controller.

Background

Currently, most metropolitan mobile transport networks are divided into three-layer network structures: core layer, convergence layer and access layer. The core layer is deployed in a central office and is connected with the tandem node through an optical fiber network; the node of the convergence layer is deployed in a central machine room or a module office of a cell; the access stratum provides access ports for users.

The core layers are interconnected by high-speed optical links, and mainly provide fast forwarding of network data packets and interconnection among aggregation nodes.

The convergence layer is mainly composed of transmission equipment located at a base station access convergence node and a data convergence point, and is responsible for service convergence and dispersion in a certain area to complete convergence of access layer traffic. The existence of the convergence layer avoids the problems of large span of an access network, serious consumption of trunk optical fibers and the like caused by the fact that an access point directly enters the core layer.

The access layer is composed of transmission equipment located in the base station, data service access point and other service access points, and is responsible for accessing the service to each convergence layer node.

Fig. 1 is a schematic structural diagram of a Radio Access Network (UTRAN) of a WCDMA (Wireless Code Division Multiple Access) system. The UTRAN consists of a Radio Network Subsystem (RNS) which is connected to a core Network through an Iu interface. The RNS includes an RNC (Radio Network Controller), and one or more Node bs (base stations). The Node B supports an FDD (frequency Division Duplex) mode, a TDD (Time Division Duplex) mode or a dual mode, can process one or more cells, and is connected to the RNC through an Iub interface. The RNC is responsible for handover control and provides the functionality to support the combining/splitting of macro diversity between different Node bs. The Node B supporting FDD mode contains an optional macro diversity function. The RNCs are connected to each other via an Iur interface, which may be connected directly via a physical connection between the RNCs or via a suitable transport network.

FIG. 2 shows a possible IS-95/cdma2000 network evolution, which IS based on the existing IS-41 core network and the developing IS-634A RAN-CN interface standard. The radio access network side shown in fig. 2 includes a BSC/PCF and a BTS (Base transceiver Station), where BSC/PCF entities are a Base Station controller and a PCF (packet support node), and one BSC/PCF may govern a plurality of BTSs. The BTSs may be distributed at different locations, forming multiple levels of base station connections, depending on their processing power and performance. For example, an ODU (outdoor unit) 3601C is connected to the lower side of the BTS3612A and the cbbts 3612 in fig. 2, and a BTS3606 at the next stage is connected to the lower side of the BTS 3606.

As can be seen from fig. 1 and 2, both in a WCDMA system and in a CDMA system, there are a base station unit (called NodeB in a WCDMA system and BTS in a CDMA system) and a base station controller unit (called RNC in a WCDMA system and BSC in a CDMA system). Existing mobile communication equipment providers provide base station controller units that are generally integrated units, i.e., base station controllers (RNC/BSC) are an integral unit.

In the process of implementing the present invention, the inventor finds that such an integrated base station controller in the prior art makes the reuse part in a plurality of base station controllers not be common in the actual mobile network construction, so in this case, the system construction cost is high, and the base station controller cannot be flexibly deployed according to the condition of the transmission network.

Disclosure of Invention

The embodiment of the invention discloses a distributed base station controller to realize flexible networking, which comprises the following steps: a central unit and at least one remote unit;

the central unit is used for receiving the signaling and the service data sent by the core network node, converting the signaling and the service data into the signaling and the service data of the internal interface protocol of the distributed base station controller and then sending the signaling and the service data to the remote unit; receiving signaling and service data sent by the remote unit, converting the signaling and service data into signaling and service data of a core network node interface protocol, and sending the signaling and service data to a core network node; and the remote unit is processed with the operation related to the weak service;

the remote unit is used for receiving the signaling and the service data sent by the central unit, processing the service and the signaling, converting the processed service data and the signaling into the signaling and the service data of a base station interface protocol and then sending the signaling and the service data to the base station; and receiving the service data and the signaling sent by the base station, processing the service and the signaling, converting the processed service data and the signaling into service data and signaling of an internal interface protocol of a base station controller, and sending the service data and the signaling to the central unit.

The embodiment of the invention also discloses a central unit of a distributed base station controller, wherein the distributed base station controller comprises a central unit which is irrelevant or weakly relevant to the service and a remote unit which is relevant to the service, and the central unit comprises: the system comprises an uplink interface subunit, an internal interconnection interface subunit and a public service management subunit;

the uplink interface subunit is configured to receive a signaling or service data sent by a core network node, convert the signaling or service data into a signaling or service data of an internal interface protocol of a distributed base station controller, and send the signaling or service data to the internal interconnection interface subunit; receiving signaling or service data sent by the internal interconnection interface subunit, converting the signaling or service data into signaling or service data of a core network node interface protocol, and sending the signaling or service data to a core network node;

the internal interconnection interface subunit is configured to receive the signaling or the service data sent by the uplink interface subunit, and send the signaling or the service data to the remote unit; receiving signaling or service data sent by a remote unit and sending the signaling or service data to the uplink interface subunit;

and the public service management subunit is configured to perform public service management on the remote unit according to the information of the remote unit received by the internal interconnection interface subunit.

The embodiment of the invention also discloses a remote unit of a distributed base station controller, wherein the distributed base station controller comprises a central unit which is irrelevant or weakly relevant to the service and a remote unit which is relevant to the service, and the remote unit comprises: the internal interconnection uplink interface subunit, the service processing subunit, the signaling processing subunit and the downlink interface subunit.

The embodiment of the invention also discloses a data transmission method in a distributed base station controller, which is applied to the distributed base station controller, wherein the distributed base station controller comprises a central unit which is irrelevant or weakly relevant to the service and a remote unit which is relevant to the service, and the method comprises the following steps:

a remote unit of a distributed base station controller receives service data sent by a downstream node; the downstream node is a base station directly connected with the remote unit or a next-level remote unit;

the remote unit carries out data exchange processing on service data received from a base station directly connected with the remote unit locally, and carries out data exchange processing locally after converting the service data received from a next-stage remote unit directly connected with the remote unit into service data of a distributed base station controller internal interface protocol;

or, converting the multi-branch service data received from the base station directly connected with the base station into service data of an internal interface protocol of the distributed base station controller, then merging the service data, merging the multi-branch service data received from the next-stage remote unit directly connected with the multi-branch service data, converging the merged service data through statistical multiplexing, and sending the converged service data to a central unit of the base station controller for processing.

Drawings

Fig. 1 is a schematic diagram of a prior art WCDMA system radio access network;

FIG. 2 IS a diagram illustrating an IS-95/CDMA2000 network evolution in the prior art;

fig. 3A, fig. 3B and fig. 3C are schematic structural diagrams of a central unit of a distributed base station controller according to a first embodiment of the present invention;

fig. 4A, fig. 4B and fig. 4C are schematic structural diagrams of a remote unit of a distributed base station controller according to a first embodiment of the present invention;

fig. 5 is a schematic diagram of a service processing subunit in a remote unit according to a first embodiment of the present invention;

fig. 6A, fig. 6B and fig. 6C are schematic structural diagrams of a distributed base station controller according to a first embodiment of the present invention;

fig. 7 is a schematic structural diagram of a cascade of remote units in a distributed base station controller according to a first embodiment of the present invention;

fig. 8A and 8B are schematic diagrams of an access network based on a distributed base station controller according to a second embodiment of the present invention;

fig. 9A and 9B are schematic diagrams of an access network using a distributed base station controller as a transmission aggregation node according to a third embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example one

The present embodiment describes the structure of a distributed base station controller, and the structure of a central unit and a remote unit.

The components of a base station controller of a current mobile communication system, such as a WCDMA/CDMA system, are usually composed of the following necessary logical parts:

the interface unit is used for providing uplink and downlink physical interfaces, the uplink interface interacts with a core network node, and the downlink interface interacts with a base station;

a signaling processing unit for providing signaling processing capability;

the service processing unit is used for providing service processing capacity;

the operation maintenance unit is used for providing system management functions, such as configuration, alarm, maintenance, performance statistics and the like;

and the clock unit is used for providing a clock for the system.

The clock unit and the operation maintenance unit in the above units can be regarded as a common service management unit unrelated to or weakly related to service processing, and the service processing unit and the signaling unit are dedicated processing units related to specific services, so in order to improve the scalability of the system, the present embodiment divides the base station controller into a central unit unrelated to (or weakly related to) services and a remote unit related to services.

The central unit includes the shareable part of the base station controller, and the key part of the unit is composed of a common service management unit which is not related (or weakly related) to the system capacity, such as: clock subunit, operation maintenance subunit etc. under the condition of system expansion, the central unit need not increase the configuration in addition.

The remote unit includes the service processing part of the base station controller, and the unit is related to the service processing, including the signaling processing subunit, the service processing subunit, etc. According to different services to be processed, the remote Unit may have multiple types, such as a Selection/Distribution Unit (SDU) with a soft handover merging function, and a path of the SDU with the best quality may be selected from two soft handover branches of the user terminal at the SDU and sent to the core network. The remote unit is closely related to the number of sector carrier frequencies to be carried and the processing flow, and when the sector carrier frequency number to be supported by the system exceeds a certain specification, the corresponding remote unit needs to be added.

Referring to fig. 3A, which is a schematic structural diagram of a central unit of a distributed base station controller according to a first embodiment of the present invention, the central unit 10 includes: an uplink interface subunit 11, an internal interconnection interface subunit 12, a clock subunit 13, and an operation maintenance subunit 14 (the clock subunit 13 and the operation maintenance subunit 14 constitute a common service management subunit), where:

and the uplink interface subunit 11 is configured to interact with a core network node. In the WCDMA system, the uplink interface subunit 11 may be an IuCS or IuPS interface unit, at this time, on the signaling plane, the uplink interface subunit 11 converts the internal interface protocol signaling of the distributed base station controller into the signaling of the IuCS or IuPS interface protocol, and forwards the signaling to the core network node, or receives the IuCS or IuPS interface protocol signaling sent by the core network node, converts the signaling into the internal interface protocol signaling of the distributed base station controller, and sends the signaling to the internal interconnection interface subunit 12; in the service plane, the uplink interface subunit 11 converts the data packet of the internal interface protocol of the distributed base station controller into a data packet of the IuCS or IuPS interface protocol, and forwards the data packet to the core network node, or receives the data packet of the IuCS or IuPS interface protocol sent by the core network node, converts the data packet into a data packet of the internal interface protocol of the distributed base station controller, and sends the data packet to the internal interconnection interface subunit 12. In the CDMA system, the uplink interface subunit 11 may be an A1/a2/a5 interface, or an A8/a9/a10/a11 interface unit, at this time, on the signaling plane, the uplink interface subunit 11 converts the internal interface protocol signaling of the distributed base station controller into the signaling of an A1/A1p or a9/a11 interface protocol, and forwards the signaling to the core network node, or converts the signaling of an A1/A1p or a9/a11 interface protocol received from the core network node into the internal interface protocol signaling of the distributed base station controller, and sends the signaling to the internal interconnection subunit 12; on the service plane, the uplink interface subunit 11 converts the data packet of the internal interface protocol of the distributed base station controller into the data packet of the A2/A2p/A8/a10 interface protocol, and forwards the data packet to the core network node, or converts the data packet of the A2/A2p/A8/a10 interface protocol received from the core network node into the data packet of the internal interface protocol of the distributed base station controller, and sends the data packet to the internal interconnection interface subunit 12.

And the internal interconnection interface subunit 12 is used for carrying out information interaction with the remote unit. Internal interconnection interface subunit 12 communicates using the internal interface protocol of the distributed base station controller. The internal interconnection interface subunit 12 may receive the signaling and data packet sent by the remote unit, and forward the signaling and data packet to the operation and maintenance subunit 14 or send the signaling and data packet to the core network node through the uplink interface subunit 11. The internal interconnection interface sub-unit 12 may further send an operation instruction or information generated by the clock sub-unit 13 or the operation maintenance sub-unit 14 to the remote unit, or send signaling or information of the core network node forwarded by the uplink interface sub-unit 11 to the remote unit.

And a clock subunit 13, configured to provide a clock for the system. In a WCDMA system or a CDMA system, the clock subunit 13 may include a transmission clock synchronization subunit, and the clock subunit is configured to send a synchronization signal to the base station according to the information reported by the base station, so as to synchronize the transmission clock of the base station. The clock subunit 13 sends synchronization signals and other clock information to the internal interconnect interface subunit 12.

An operation maintenance subunit 14, configured to receive information on configuration, alarm, maintenance, or performance statistics reported by the remote units of the distributed base station controller forwarded by the internal interconnection interface subunit 12, send the information to the network management center through the interface with the network management center for corresponding operation maintenance processing, receive the processing result and configuration data of the network management center from the interface with the network management center if necessary, and send the processing result and configuration data to the remote units in the distributed base station controller through the internal interconnection interface subunit 12. The operation and maintenance subunit 14 typically also includes a near-end maintenance subunit for near-end maintenance of the system.

The central unit may be expanded as desired. The central unit may also comprise service processing functions of some of the remote units, i.e. the central unit may comprise one or more dedicated service processing sub-units. Figure 3B shows a schematic of the structure of a central unit comprising a dedicated service processing subunit. As shown in fig. 3B, the central unit 10' further includes a dedicated service processing subunit 30 based on fig. 3A, where the dedicated service processing subunit 30 includes a service processing subunit 33 and a signaling processing subunit 34;

a service processing subunit 33, configured to receive service data sent by the uplink interface subunit 11 of the central unit 10', perform service processing, and send the service data to the internal interconnection interface subunit 12; receiving service data sent by the internal interconnection interface subunit 12, performing service processing, and sending the service data to the uplink interface subunit 11;

a signaling processing subunit 34, configured to receive a signaling sent by the uplink interface subunit 11 of the central unit 10', perform signaling processing, and send the signaling to the internal interconnection interface subunit 12; and receiving the signaling sent by the internal interconnection interface subunit 12, performing signaling processing, and sending the signaling to the uplink interface subunit 11.

The central unit may also be directly connected to the base station and the data of the base station is processed by the dedicated service processing subunit 30 in the central unit, so that a downlink interface subunit needs to be included in the central unit to receive and transmit the data of the base station, and fig. 3C shows a schematic diagram of a structure of the central unit capable of directly communicating with the base station. As shown in fig. 3C, a downstream interface subunit 15 is included in the central unit 10 ".

The downlink interface subunit 15 is connected to the base station, and is configured to receive the signaling and the service data sent by the base station, and perform protocol conversion processing on the signaling. In the WCDMA system, on the signaling plane, the downlink interface subunit 15 receives the signaling sent by the signaling processing subunit 34, and converts the signaling into an Iub interface protocol signaling to be sent to the base station, or receives an Iub interface protocol signaling sent by the base station, converts the Iub interface protocol signaling into a distributed base station controller internal interface protocol signaling, and sends the signaling to the signaling processing subunit 34; in the service plane, the downlink interface subunit 15 receives the service data sent by the service processing subunit 33, converts the service data into service data of the Iub interface protocol, and sends the service data to the base station, or receives the service data of the Iub interface protocol sent by the base station, converts the service data into service data of the internal interface protocol of the distributed base station controller, and sends the service data to the service processing subunit 33. In the CDMA system, on the signaling plane, the downlink interface subunit 15 receives the signaling sent by the signaling processing subunit 34, converts the signaling into the protocol signaling of the Abis interface, and sends the protocol signaling of the Abis interface to the base station, or receives the protocol signaling of the Abis interface sent by the base station, converts the protocol signaling of the Abis interface into the signaling of the internal interface protocol of the distributed base station controller, and sends the signaling to the signaling interface subunit 34; in the service plane, the downlink interface subunit 15 receives the service data sent by the service processing subunit 33, converts the service data into service data of the Abis interface protocol, and sends the service data to the base station, or receives the service data of the Abis interface protocol sent by the base station, converts the service data into service data of the internal interface protocol of the distributed base station controller, and sends the service data to the service processing subunit 33.

A service processing subunit 33, configured to receive the service data sent by the downlink interface subunit 15, perform service processing, and send the service data to the uplink interface subunit 11; and receiving the service data sent by the uplink interface subunit 11, performing service processing, and sending the service data to the downlink interface subunit 15.

A signaling processing subunit 34, configured to receive the signaling sent by the downlink interface subunit 15, perform signaling processing, and send the processed signaling to the uplink interface subunit 11; and receiving the signaling sent by the uplink interface subunit 11, performing signaling processing, and sending the processed signaling to the downlink interface subunit 15.

Referring to fig. 4A, which is a schematic structural diagram of a remote unit of a distributed base station controller according to a first embodiment of the present invention, the remote unit 20 includes: downlink interface subunit 21, internal interconnection uplink interface subunit 22, service processing subunit 23, and signaling processing subunit 24, where:

an interconnect upstream interface subunit 22 for connection to the central unit. The inter-working uplink interface subunit 22 communicates using the inter-working interface protocol of the distributed base station controller. The internal interconnection uplink interface subunit 22 can receive the service data sent by the central unit, send the service data to the service processing subunit 23, receive the signaling sent by the central unit, and send the signaling to the signaling processing subunit 24. The inter-working uplink interface subunit 22 may also send service data or signaling sent by the service processing subunit 23 and the signaling processing subunit 24 to the central unit.

A service processing subunit 23, configured to receive the service data sent by the downlink interface subunit 21, perform corresponding service processing, and send the service data to the internal interconnection uplink interface subunit 22; the service processing subunit 23 further receives the service data sent by the internal interconnection uplink interface subunit 22, performs corresponding service processing, and sends the service data to the downlink interface subunit 21. For example, the service processing subunit 23 may implement that the service data forwarded by the inter-connected uplink interface subunit 22 is sent on multiple branches, or implement multi-branch combination on the service data received by the downlink interface subunit 21 by using macro diversity, combine the service data sent on multiple branches, and send the combined service data to the inter-connected uplink interface subunit 22.

A signaling processing subunit 24, configured to receive the signaling sent by the downlink interface subunit 21, perform signaling processing, and send the processed signaling to the internal interconnection uplink interface subunit 22; or, receive the signaling sent by the inter-connected uplink interface subunit 22, perform signaling processing, and send the signaling to the downlink interface subunit 21.

And a downlink interface subunit 21, connected to the base station, and configured to receive the signaling and the service data sent by the base station and perform protocol conversion processing. In the WCDMA system, on the signaling plane, the downlink interface subunit 21 receives the signaling sent by the signaling processing subunit 24, and converts the signaling into an Iub interface protocol signaling to be sent to the base station, or receives an Iub interface protocol signaling sent by the base station, converts the Iub interface protocol signaling into a distributed base station controller internal interface protocol signaling, and sends the signaling to the signaling processing subunit 24; in the service plane, the downlink interface subunit 21 receives the service data sent by the service processing subunit 23, converts the service data into service data of the Iub interface protocol, and sends the service data to the base station, or receives the service data of the Iub interface protocol sent by the base station, converts the service data into service data of the internal interface protocol of the distributed base station controller, and sends the service data to the service processing subunit 23. In the CDMA system, on the signaling plane, the downlink interface subunit 21 receives the signaling sent by the signaling processing subunit 24, and converts the signaling into an Abis interface protocol signaling to be sent to the base station, or receives the Abis interface protocol signaling sent by the base station, converts the Abis interface protocol signaling into a distributed base station controller internal interface protocol signaling, and sends the signaling to the signaling interface subunit 24; in the service plane, the downlink interface subunit 21 receives the service data sent by the service processing subunit 23, converts the service data into service data of the Abis interface protocol, and sends the service data to the base station, or receives the service data of the Abis interface protocol sent by the base station, converts the service data into service data of the internal interface protocol of the distributed base station controller, and sends the service data to the service processing subunit 23.

The remote units may also be cascaded, and an internal interconnection downlink interface subunit 25 is further required in the remote unit for implementing cascade, for example, in the remote unit 20' shown in fig. 4B, the internal interconnection downlink interface subunit 25 is connected to the internal interconnection uplink interface subunit of the next-stage remote unit by wire (for example, by a cable or an access network), so as to implement data interaction.

The remote units may be many according to different implemented services, for example, a remote unit implementing multi-branch merging and traffic aggregation, where the service processing subunit 23 may be as shown in fig. 5, and includes:

a multi-branch merging subunit 233, configured to merge the received multi-branch service data and send the merged multi-branch service data to the data reassembly subunit; this subunit may also be subdivided into a local multi-branch merging subunit 2331 and a downstream multi-branch merging subunit 2332. The local multi-branch combining sub-unit 2331 is configured to perform multi-branch combining on data received by the remote unit from a base station directly connected to the remote unit, and the downstream multi-branch combining sub-unit 2332 is configured to perform multi-branch combining on data received by the remote unit from a remote unit at a next stage;

a data reassembly subunit 232, configured to repackage the service data merged by the multi-branch merging subunit 233, packetize a plurality of service data packets into one service data packet, and send the service data packet to the data aggregation subunit 231;

the data aggregation subunit 231 is configured to perform statistical multiplexing on the uplink data stream, so as to save the uplink transmission bandwidth.

The service processing subunit 23 of the remote unit may further include a local switching subunit 235, configured to perform switching of service flows locally for the call between the users. For local traffic, the inter-user call refers to the inter-user call governed by the base station to which the remote unit is directly connected, and these user traffic flows use the same vocoder; for downstream traffic, inter-user traffic is referred to herein as inter-user traffic between the next-level remote units of the remote units, and these user traffic streams use the same vocoder.

Since the remote unit may perform local data exchange processing, in order to avoid traffic overload of the remote unit, the remote unit may further include a resource management subunit inside, for example, in the remote unit 20 ″ shown in fig. 4C, the resource management subunit 26 is configured to perform load distribution according to the traffic processing capability of the remote unit. The resource management subunit 26 distributes the load to the boards of the local remote units as much as possible for processing, and when the resource management subunit 26 detects that the load of the service processing subunit 23 is too heavy (for example, detects that the CPU load of the remote units reaches a preset threshold), a part of the load may be distributed to the central unit for processing through the internal interconnection interface subunit 22.

The central unit and the remote units form a distributed base station controller.

The distributed base station controller of the embodiment comprises a central unit and at least one remote unit. The central unit and the remote units can be directly connected through cables or optical cables and can also be interconnected through a transmission network. The internal interconnection interface subunit of the central unit and the internal interconnection uplink interface subunit of the remote unit can be connected through a transmission network, and a distributed base station controller internal interface protocol is adopted for communication.

The central unit and the remote units in the distributed base station controller can be independently deployed, and one central unit can be connected with a plurality of remote units. The central unit can be combined with the remote units to form a mixture, and in this way, not only can the existing base station controller architecture (namely, the central unit and all the remote units are placed together) be realized, but also a novel freely-expanded system architecture can be provided. The distributed base station controller architecture can bring convenience to the capacity expansion of a mobile communication system, and when the capacity of the system is increased, the capacity expansion of the remote unit at the base station controller side can be flexibly increased.

Depending on the extension of the central unit, the distributed base station controller may be as shown in fig. 6A, 6B and 6C.

The distributed base station controller shown in fig. 6A is composed of a central unit 10 and a plurality of remote units 20, and the internal interconnection interface subunit of the central unit 10 and the internal interconnection uplink interface subunit of the remote units may be connected by a transmission network, and communicate by using a distributed base station controller internal interface protocol. The central unit 10 includes a clock subunit 13, an operation and maintenance subunit 14, and other subunits for implementing a common service management function.

The distributed base station controller shown in fig. 6B is based on the distributed base station controller shown in fig. 6A, and the central unit 10 'may further include a remote subunit 30 for implementing a dedicated service processing function, in addition to the clock subunit 13, the operation and maintenance subunit 14 and other subunits for implementing a common service management function, so that the central unit 10' can implement functions of some remote units.

The distributed base station controller shown in fig. 6C is based on the distributed base station controller shown in fig. 6B, and the central unit 10 ″ further includes a downlink interface subunit 15 therein, so that the remote subunit 30 inside the central unit 10 ″ is connected to the base station through the downlink interface subunit 15, so that the central unit 10 ″ can directly communicate with the base station, and the base station is controlled and managed correspondingly through the internal remote subunit 30.

The distributed base station controller may be as shown in fig. 7 according to whether the remote units in the distributed base station controller are cascaded. In the distributed base station controller shown in fig. 7, the remote units may be cascaded in multiple stages, where only two-stage cascading is shown in the figure, as shown in fig. 7, a remote unit 4 and a remote unit 5 are connected below the remote unit 1, and the remote unit 1 may also be connected to one or more base stations (only 1 base station is shown in the figure). The structure of the remote unit 1 can be as shown in fig. 4B, the structure of the remote unit 4 or the remote unit 5 can be as shown in fig. 4A or fig. 4C, and the structure of the central unit can be as shown in fig. 3A, fig. 3B or fig. 3C.

Example two

The embodiment describes a wireless access network networking structure based on a distributed base station controller, and a processing flow of the distributed base station controller.

Referring to fig. 8A, which is a schematic diagram of an access network based on a distributed base station controller according to a second embodiment of the present invention, the access network includes a central unit C _ BSC, the C _ BSC may be directly connected to a BTS or connected to one or more remote units R _ BSC, and one R _ BSC may converge a plurality of base stations and implement call processing of the base stations. Wherein,

the C _ BSC mainly provides a common function of the base station controller. One or more C _ BSCs may be included in the access network. The C _ BSC can also select some remote subunits according to the requirement. In general, according to the principle of maintenance convenience, the C _ BSC may be deployed in a central city, for example, in the same machine room as an MGW (media gateway)/MSCe (mobile soft handover center).

The R _ BSC mainly provides the service processing function of the base station controller. The R _ BSC may be deployed in the same room as the BTS or the transmission aggregation equipment.

The C _ BSC and the R _ BSC constitute a distributed base station controller, and the structure of the distributed base station controller may be as described in the first embodiment. In the access network shown in fig. 8A, for the WCDMA system, the processing flow of C _ BSC (the structure of which can be shown in fig. 3A) is:

on a signaling surface in a downlink direction, an uplink interface subunit of the C _ BSC performs protocol conversion on a signaling received from an IuCS or IuPS interface, and forwards the signaling to the corresponding R _ BSC for processing through an internal interconnection interface subunit; on the service surface, an uplink interface subunit of the C _ BSC converts the service data received by the IuCS or IuPS interface into a format of an internal interface protocol of the C _ BSC and the R _ BSC, and forwards the format to the corresponding R _ BSC for processing through an internal interconnection interface subunit;

on the signaling surface in the uplink direction, the uplink interface subunit of the C _ BSC converts the signaling of the internal interface protocol sent by the R _ BSC, which is received by the internal interconnection interface subunit, into the signaling of the IuCS or IuPS interface protocol, and forwards the signaling to the core network equipment; on the service surface, the uplink interface subunit of the C _ BSC converts the service data of the internal interface protocol sent by the R _ BSC, which is received by the internal interconnection interface subunit, into the service data of the IuCS or IuPS interface protocol, and forwards the service data to the core network equipment;

on the operation maintenance surface, the internal interconnection interface subunit of the C _ BSC sends the information of alarm, performance statistics and the like collected from the R _ BSC to the operation maintenance subunit, and the information is sent to the network management center by the operation maintenance subunit, and meanwhile, the configuration data is sent to each R _ BSC through the operation maintenance subunit and the internal interconnection interface subunit.

In the access network shown in fig. 8A, for the CDMA system, the processing flow of C _ BSC (the structure of which can be shown in fig. 3A) is basically the same as that in the WCDMA system described above, except that:

since the uplink interface subunit of the C _ BSC is connected to the core network device through the A1/A1p or a9/a11 interface on the signaling plane, the uplink interface subunit converts the protocol format of the A1/A1p or a9/a11 interface and the protocol format of the internal interface of the distributed base station controller during signaling. Since the uplink interface subunit of the C _ BSC is connected to the core network device through the A2/A2p/A8/a10 interface on the service plane, when the uplink interface subunit receives and transmits service data, the protocol format of the A2/A2p/A8/a10 interface is converted to the protocol format of the internal interface of the distributed base station controller.

In the access network shown in fig. 8A, for the WCDMA system, the processing flow of R _ BSC (the structure of which can be shown in fig. 4C) is:

on a signaling plane in a downlink direction, an internal interconnection uplink interface subunit of the R _ BSC sends a signaling from the C _ BSC to a signaling processing subunit for processing, then sends the signaling to the downlink interface subunit, converts the processed signaling into an Iub interface signaling format and sends the Iub interface signaling format to the NodeB; meanwhile, the signaling processing subunit of the R _ BSC also realizes wireless resource management; on the service surface, the internal interconnection uplink interface subunit of the R _ BSC sends the service data from the C _ BSC to the service processing subunit for processing, and then sends the service data to the downlink interface subunit, where the processed service data is converted into an Iub interface data format and sent to the NodeB. For the case of soft handover branch, the service data can be sent on multiple branches simultaneously through the service processing subunit in the remote unit of the corresponding R _ BSC.

On the signaling surface in the uplink direction, the downlink interface subunit of the R _ BSC converts the signaling sent by the Iub interface into an internal message format, and forwards the signaling to the C _ BSC by the internal interconnection uplink interface subunit after the signaling processing subunit processes the signaling; on the service surface, the downlink interface subunit of the R _ BSC converts the service data sent by the Iub interface into an internal message format, and after the service data is processed by the service processing subunit, the internal interconnection uplink interface subunit forwards the internal interconnection uplink interface data to the C _ BSC;

on the operation maintenance surface, the R _ BSC collects information of alarm, performance statistics and the like, sends the information to the C _ BSC through an interface between the C _ BSC and the R _ BSC, and receives configuration data sent by the C _ BSC;

in the access network shown in fig. 8A, for the CDMA system, the processing flow of R _ BSC is basically the same as that in the WCDMA system described above, except that:

because the downlink interface subunit of the R _ BSC is connected to the base station through the Abis interface on the signaling plane and the service plane, the downlink interface subunit performs mutual conversion between the Abis interface protocol format and the internal interface protocol format of the distributed base station controller when receiving and transmitting signaling and service data.

Fig. 8B is a schematic diagram of a second access network based on a distributed base station controller according to a second embodiment of the present invention. The access network structure shown in fig. 8B is based on fig. 8A, where R _ BSCs are cascaded in multiple stages, and one R _ BSC may converge a plurality of next-stage R _ BSCs and a plurality of base stations. As shown in fig. 8B, the R _ BSC1 (the structure of which can be shown in fig. 4B) is connected with R _ BSC4 and R _ BSC5 (the structures of R _ BSC4 and R _ BSC5 can be shown in fig. 4A or 4C, respectively), and the BTS. The processing flow of the signaling or data is similar to the above flow. Because the communication protocols adopted by the internal interconnection downlink interface subunit of the R _ BSC1 and the internal interconnection uplink interface subunit of the R _ BSC4 or the R _ BSC5 are internal protocols of the distributed base station controller, protocol conversion is not needed.

The R _ BSC can be deployed close to the base station as much as possible, so that the control path is shortened, and the wireless network performance is improved. An R _ BSC can be deployed in a region with more concentrated base stations and then gradually converged to a central controller in a multi-stage cascade mode. Can be flexibly deployed according to the characteristics of the transmission network.

The generation reason of the cascade networking is related to a transmission network, if a wireless network is established in a region with a relatively dispersed population, users are few, if a non-distributed networking mode is adopted, the coverage range of one controller is very large, the distance from a base station in a remote region to the controller is very long, and the cascade networking method is suitable for multi-stage cascade aggregation in the scene. In another scenario, users are distributed in a strip-shaped area, such as coverage of a traffic line or coverage of a river two-side residential area, and the method is also suitable for multi-stage cascade convergence.

In this embodiment, the C _ BSC may independently expand capacity, and the number of R _ BSCs may also be increased as needed, so that the access network system architecture based on the distributed base station controller is very flexible. The R _ BSC has simplified capacity and function, so the volume can be reduced, and the network distribution is more flexible.

After the base station controller realizes distribution, the remote unit can be flexibly deployed and can be deployed to any position according to the network performance requirement and the transmission network structure requirement. In order to reduce the cost of renting the transmission network by the operator, the remote unit with the convergence function in the distributed base station controller, such as the SDU unit with the soft handover combining function, can be deployed on the convergence node in the transmission network, so as to achieve the purpose of reducing the resource occupation and the cost.

In the current mobile communication (such as CDMA/WCDMA/GSM system) transmission networking, the transmission network is often divided into an access part of the last kilometer and a metropolitan backbone transmission network; the access mode of the last kilometer is diversified, and the microwave transmission is mainly used at present. Under the condition of microwave transmission networking, a transmission aggregation node basically exists, and the setting of the transmission aggregation node can reduce the resource requirement of a transmission network.

EXAMPLE III

The embodiment describes a radio access network structure for transferring an SDU unit with soft handover combining function in a distributed base station controller to a transmission aggregation node, and a data processing procedure.

Referring to fig. 9A, a schematic diagram of an access network using a remote unit (SDU unit with soft handover combining function) in a distributed base station controller as a transmission aggregation node according to a third embodiment of the present invention is shown. In the access network, a plurality of BTSs are included, wherein a part of the BTSs are converged to the R _ BSC1 (the structure of which may be shown in fig. 4A or fig. 4C), a part of the BST is converged to the R _ BSC2 (the structure of which may be shown in fig. 4A or fig. 4C), and the R _ BSC1 and the R _ BSC2 are connected to the C _ BSC (the structure of which may be shown in fig. 3A, fig. 3B or fig. 3C) via a transport network (e.g., a synchronous digital transport network SDN transport network). Wherein C _ BSC is a central unit; the R _ BSC1 and the R _ BSC2 are remote units, respectively, the R _ BSC1 is an SDU unit with soft handover combining function, and the R _ BSC1 is located at the transmission aggregation node. The base station may be 1 × S222, supporting 168TCE, configured as 2E 1.

WCDMA systems, as well as CDMA2000 communication systems, have a unit called SDU in the distributed base station controller since soft handover is supported. The SDU unit selects a path with the best quality from two soft switching branches of MS/UE (user terminal) at the SDU position, and then the path is uploaded to a core network. Due to the soft handover merging function of the SDU, the resource requirements on both sides of the SDU are different, and more transmission resources are required in the downlink direction (towards the base station side) of the SDU than in the uplink direction (towards the core network side).

In this embodiment, the R _ BSC1 is a remote unit mainly including an SDU processing unit with a soft handover combining function, and the R _ BSC1 is placed at a transmission aggregation node, so that multiple branches can be combined and then transmitted to the transmission network by using the macro diversity combining function of the SDU itself.

The process of aggregating data by the R _ BSC1 is as follows:

the downlink interface subunit of the R _ BSC1 receives the service data and signaling sent by the base station, converts the service data and signaling into the service data and signaling format of the internal interface protocol of the distributed base station controller, sends the service data after protocol conversion to the service processing subunit of the R _ BSC1, and sends the signaling after protocol conversion to the signaling processing subunit; the service data received by the downlink interface subunit comprises multi-branch data;

the traffic processing sub-unit of R _ BSC1 may include a multi-branch merging sub-unit and a data reassembly sub-unit. The multi-branch merging subunit selects a path of data with the best quality for the multi-branch data in the service data by using the macro diversity merging function of the multi-branch merging subunit, merges the multi-branch data, and then sends the merged multi-branch data to the data recombining subunit; the data reassembly sub-unit may repack the service data, and when receiving the uplink air interface frame, the data reassembly sub-unit reorganizes the uplink frame, which may be a long packet method, that is, a plurality of service data packets are packetized into one uplink service data packet, and then the processed service data packet is sent to the internal interconnection interface sub-unit of the R _ BSC 1. The service processing subunit of the R _ BSC1 may further include a data aggregation subunit, and the subunit may receive the data packets reassembled by the data reassembly subunit, perform traffic aggregation through statistical multiplexing, and then send the data packets to the C _ BSC through the internal interconnection interface subunit.

The traffic processing sub-unit of R _ BSC1 may also include a local switching sub-unit for processing traffic data that does not need to be uploaded to the core network or other network devices, but may be processed locally. For example, for users using the same vocoder, the call traffic after the call connection is established can be directly switched locally by the R _ BSC1 without being uploaded to the core network for processing, thereby saving part of the bandwidth and reducing the network delay.

After receiving the service data, the signaling processing subunit of the R _ BSC1 performs signaling processing, and sends the processed signaling to the internal interconnection interface subunit of the R _ BSC 1;

and after receiving the processed service data and signaling, the internal interconnection interface subunit of the R _ BSC1 sends the processed service data and signaling to the C _ BSC.

In the process, because the SDU terminates the branch, when the SDU is sent to a core network, the service data can be packaged again, and a plurality of service data packets are packaged into an uplink service data packet by adopting a long packet mode, so that the proportion of overhead bits of each service data packet is greatly reduced; in addition, because a plurality of data packets are combined into one data packet, the number of uplink packets is greatly reduced, and thus, the number of packets on the SDH transmission network is greatly reduced. Thereby, the resources of the leased or self-established SDH transmission network can be greatly reduced.

In this embodiment, according to the network topology, the R _ BSC having the distribution selection processing function (e.g., SDU unit having soft handover function) may be placed on a suitable transmission aggregation node. At present, in a mobile communication network, there are tree type networking and chain type networking. For tree networking, such R BSCs may be placed at the branch to trunk, near the trunk transmission network, e.g., in the "last kilometer" access section; for chain type networking, such an R _ BSC may be placed in a place between the chain and the backbone transport network.

Since the remote unit can cascade in multiple stages and can connect to the base station, the flow received by the remote unit from the remote unit at the next stage is called downstream traffic, and the traffic received from the base station connected to the remote unit is called local traffic. And the remote unit at the aggregation node directly processes the received local traffic locally, aggregates the received downstream traffic (non-local traffic) and uploads the aggregated downstream traffic.

Referring to fig. 9B, a second schematic diagram of an access network using remote units (SDU units) in a distributed base station controller as transmission aggregation nodes according to a third embodiment of the present invention is shown in fig. 9A, where, on the basis of fig. 9A, an R _ BSC1 (the structure of which may be shown in fig. 4B) is cascaded with an R _ BSC3 (the structure of which may be shown in fig. 4A or fig. 4C) and an R _ BSC4 (the structure of which may be shown in fig. 4A or fig. 4C), and the R _ BSC1 may also be directly connected with a BTS.

When the R _ BSC1 converges the received service data, it processes the local traffic and the downstream traffic, and the processing procedure is as follows:

for the local traffic received by the R _ BSC1 from the base station below, the local multi-branch merging subunit in the R _ BSC1 performs multi-branch merging processing, and for the downstream traffic received from the R _ BSC3 and the R _ BSC4 at the next stage of the R _ BSC1, the downstream multi-branch merging subunit in the R _ BSC1 performs multi-branch merging processing on the data between the user governed by the R _ BSC3 and the user governed by the R _ BSC 4. The local multi-branch merging subunit and the downstream multi-branch merging subunit send the merged data stream to the data reassembly subunit for repacking, and the data reassembly subunit sends the packed data to the traffic aggregation subunit for statistical multiplexing and then to the internal interconnection interface subunit. Meanwhile, the local exchange subunit of the R _ BSC1 performs local exchange on call data between users in local traffic, and performs local exchange on call data between a user governed by the R _ BSC3 and a user governed by the R _ BSC4 in downstream traffic. The local exchange is used to refer to that the traffic of the user using the same vocoder can be directly exchanged in the remote unit without being sent to the core network for processing.

Since the R _ BSC1 can perform local switching processing on the call traffic between users, a resource management subunit can be arranged inside the R _ BSC1 to implement monitoring and distribution of the traffic load of the R _ BSC 1. When the resource management subunit monitors that the traffic load of the R _ BSC1 reaches a preset threshold, part of the traffic data may be sent to the C _ BSC1 for processing, so as to reduce the load of the R _ BSC1, achieve the purpose of resource sharing, and ensure the quality of service.

The R _ BSC (such as SDU unit) with the distribution selection processing function can also be arranged at the transmission aggregation node of the existing network, so as to realize the multi-branch combination function and strengthen the aggregation capability of the transmission aggregation node. In this case, the SDU unit includes an uplink interface subunit, and the data after multi-branch combination is uploaded to a network entity at an upper stage for processing through a transmission network and a network entity in an uplink direction, such as an R _ BSC or a C _ BSC at an upper stage.

In the embodiment of the invention, the combination of R _ BSC and the arrangement of the transmission aggregation node in the traditional wireless access network enables the transmission network and the mobile communication network to be fused to a certain degree, thereby saving system resources and improving the performance of the wireless network in the mobile network construction. The R _ BSC in the embodiment of the invention can realize the local exchange function so as to further save partial bandwidth and reduce network delay; the resource management function in the R _ BSC can realize resource sharing so as to ensure the service quality.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A central unit of a distributed base station controller, said distributed base station controller comprising a traffic-independent or weakly traffic-dependent central unit and a traffic-dependent remote unit, said central unit comprising: the system comprises an uplink interface subunit, an internal interconnection interface subunit and a public service management subunit;

2. The central unit according to claim 1, wherein the common service management subunit comprises:

the clock subunit is configured to send, to the internal interconnection interface subunit, an instruction for instructing the remote unit to perform clock synchronization according to the received information of the remote unit;

and the operation maintenance subunit is used for performing operation maintenance processing on the remote unit according to the received information of the remote unit.

3. The central unit according to claim 1, wherein the central unit further comprises a dedicated service processing subunit, the dedicated service processing subunit comprising:

the service processing subunit is configured to receive the service data sent by the uplink interface subunit, perform service processing, and send the service data to the internal interconnection interface subunit; receiving the service data sent by the internal interconnection interface subunit, and sending the service data to the uplink interface subunit after service processing;

the signaling processing subunit is configured to receive the signaling sent by the uplink interface subunit, perform signaling processing, and send the signaling to the internal interconnection interface subunit; and receiving the signaling sent by the internal interconnection interface subunit, processing the signaling and then sending the processed signaling to the uplink interface subunit.

4. The center unit of claim 3, wherein the center unit further comprises:

the downlink interface subunit is used for receiving the service data sent by the service processing subunit, receiving the signaling sent by the signaling processing subunit, converting the signaling into the signaling of the base station interface protocol, and sending the signaling to the base station; and receiving signaling and service data sent by the base station, converting the signaling and service data into signaling and service data of a distributed base station controller internal protocol, and sending the signaling and service data to the signaling processing subunit and the service processing subunit respectively.

5. A remote unit of a distributed base station controller, the distributed base station controller comprising a central unit that is traffic independent or weakly traffic dependent and a remote unit that is traffic dependent, the remote unit comprising: the internal interconnection uplink interface subunit, the service processing subunit, the signaling processing subunit and the downlink interface subunit;

the internal interconnection uplink interface subunit is used for receiving the signaling and the service data sent by the central unit and respectively sending the signaling and the service data to the service processing subunit and the signaling processing subunit;

the service processing subunit is configured to receive service data sent by the internal interconnection uplink interface subunit, perform service processing, and send the service data to the downlink interface subunit; receiving the service data sent by the downlink interface subunit, and sending the service data to the internal interconnection uplink interface subunit after service processing;

the signaling processing subunit is configured to receive the signaling sent by the internal interconnection interface subunit, perform signaling processing, and send the signaling to the downlink interface subunit; receiving the signaling sent by the downlink interface subunit, and sending the signaling to the internal interconnection uplink interface subunit after the signaling is processed;

the downlink interface subunit is used for receiving the service data sent by the service processing subunit, receiving the signaling sent by the signaling processing subunit, converting the service data and the signaling into service data and signaling of a base station interface protocol, and then sending the service data and the signaling to the base station; and receiving signaling and service data sent by the base station, converting the signaling and service data into signaling and service data of a distributed base station controller internal interface protocol, and then respectively sending the signaling and service data to the signaling processing subunit and the service processing subunit.

6. The remote unit according to claim 5, wherein said traffic processing subunit comprises:

the multi-branch merging subunit is used for merging the received multi-branch service data;

and the data recombination subunit is used for repackaging the service data merged by the multi-branch merging subunit, packetizing a plurality of service data packets into one service data packet, and sending the service data packet to the data aggregation subunit.

7. The remote unit of claim 6, wherein the service processing subunit further comprises:

and the data aggregation subunit is used for performing statistical multiplexing on the service data processed by the data reassembly subunit and sending the service data to the internal interconnection interface subunit.

8. The remote unit of claim 6, wherein the multi-branch merging sub-unit comprises:

the local multi-branch merging subunit is used for performing multi-branch merging processing on the multi-branch service data sent by the base station directly connected with the remote unit;

and the downstream multi-branch merging subunit is used for performing multi-branch merging processing on the multi-branch service data sent by the next-stage remote unit connected with the remote unit.

9. The remote unit of claim 6, wherein the service processing subunit further comprises:

the local exchange subunit is used for exchanging data of the communication service data with the same vocoder among the users managed by the base station directly connected with the remote unit; or, performing data exchange on the communication service data with the same vocoder among the users governed by the multiple next-stage remote units directly connected with the remote unit.

10. The remote unit according to claim 5, wherein the remote unit further comprises:

and the resource management subunit is used for sending the service data processed by the service processing subunit to the central unit for processing through the uplink interface subunit when the load of the service processing subunit exceeds a threshold value is monitored.

11. The remote unit according to claim 5, wherein the remote unit further comprises:

an internal interconnection downlink interface subunit, configured to receive a signaling or service data sent by the internal interconnection uplink interface subunit of the next-stage remote unit, and send the signaling processing subunit and the service processing subunit of the remote unit, respectively, or send the signaling or service data to the internal interconnection uplink interface subunit of the remote unit; and receiving signaling or service data from the service processing subunit and the signaling processing subunit of the remote unit or from the internal interconnection uplink interface subunit, and sending the signaling or service data to the internal interconnection uplink interface subunit of the next-stage remote unit.

12. A distributed base station controller, comprising: a central unit and at least one remote unit;

13. The distributed base station controller of claim 12, wherein the plurality of remote units are connected to the central unit, respectively, or connected to the central unit after being cascaded; or one part of the remote units is connected with the central unit, and the other part of the remote units is connected with the central unit after being cascaded.

14. The distributed base station controller of claim 12, wherein the central unit comprises: the system comprises an uplink interface subunit, an internal interconnection interface subunit and a public service management subunit;

the uplink interface subunit is configured to receive a signaling or service data sent by a core network node, perform protocol conversion, and send the signaling or service data to the internal interconnection interface subunit; receiving signaling or service data sent by the internal interconnection interface subunit, performing protocol conversion, and sending the signaling or service data to a core network node;

15. The distributed base station controller of claim 14 wherein the central unit further comprises:

the special service processing subunit is used for receiving the service data and the signaling sent by the uplink interface subunit, processing the service and the signaling and then sending the processed service and the processed signaling to the downlink interface subunit; receiving the service data and signaling sent by the downlink interface subunit, and sending the service data and the signaling to the uplink interface subunit after performing service processing and signaling processing;

the downlink interface subunit is used for receiving the service data and the signaling sent by the special service processing subunit, performing protocol conversion and then sending the converted data and signaling to the base station; and receiving service data and signaling sent by the base station, performing protocol conversion, and sending to the special service processing subunit.

16. The distributed base station controller of claim 12, wherein the remote unit comprises: the internal interconnection uplink interface subunit, the service processing subunit, the signaling processing subunit and the downlink interface subunit;

the signaling processing subunit is configured to receive a signaling sent by the internal interconnection uplink interface subunit, perform signaling processing, and send the signaling to the downlink interface subunit; receiving the signaling sent by the downlink interface subunit, and sending the signaling to the internal interconnection uplink interface subunit after the signaling is processed;

the downlink interface subunit is used for receiving the service data sent by the service processing subunit, receiving the signaling sent by the signaling processing subunit, performing protocol conversion, and sending the signaling to the base station; and receiving signaling and service data sent by the base station, and sending the signaling and service data to the signaling processing subunit and the service processing subunit after protocol conversion.

17. The distributed base station controller of claim 16, wherein the remote unit further comprises:

18. The distributed base station controller of claim 16, wherein the remote unit further comprises:

and the resource management subunit is used for sending part of the service data processed by the service processing subunit to the central unit for processing through the uplink interface subunit when the load of the service processing subunit exceeds a threshold value is monitored.

19. A data transmission method in a distributed base station controller, applied to the distributed base station controller, wherein the distributed base station controller includes a central unit irrelevant or weakly relevant to service and a remote unit relevant to service, the method includes the steps of:

20. The method of claim 19, wherein the remote unit processing the traffic data locally comprises:

when the service data is the service data sent by the base station directly connected with the remote unit and the service data is the communication service data with the same vocoder among the users governed by the base station, the remote unit performs data exchange processing on the service data locally;

or, when the service data is service data sent by a next-stage remote unit directly connected to the remote unit and the service data is communication service data with the same vocoder among users governed by each next-stage remote unit, the remote unit performs data exchange processing on the service data locally.

21. The method of claim 20, wherein when the load of the remote unit reaches a threshold, further comprising: and sending part of the service data to the central unit for processing.