CN107484183A - A kind of distributed base station system, CU, DU and data transmission method - Google Patents

A kind of distributed base station system, CU, DU and data transmission method Download PDF

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Publication number
CN107484183A
CN107484183A CN201610405936.1A CN201610405936A CN107484183A CN 107484183 A CN107484183 A CN 107484183A CN 201610405936 A CN201610405936 A CN 201610405936A CN 107484183 A CN107484183 A CN 107484183A
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data
rlc
rlc protocol
protocol elements
sent
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CN107484183B (en
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孙军帅
王莹莹
陈卓
陈锋
黄学艳
易芝玲
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China Mobile Communications Group Co Ltd
China Mobile Communications Co Ltd
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China Mobile Communications Group Co Ltd
China Mobile Communications Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of distributed base station system, CU, DU and data transmission method.The M DU that distributed base station system provided by the invention includes CU and is connected with CU, M are positive integer, include C rlc protocol units, and the D rlc protocol units for data receiver in CU；Include the D rlc protocol units for being used for data transmission in DU.The invention provides a kind of distributed frame of the protocol stack function of RLC in distributed network architecture.

Description

A kind of distributed base station system, CU, DU and data transmission method
Technical field
The present invention relates to communication technical field, more particularly to a kind of distributed base station system, CU, DU and transmission side data Method.
Background technology
Based on centralization, collaborative, cloud framework, green wireless access network (Centralized, Cooperative, Cloud＆Clean-Radio Access Network, C-RAN) cloud platform front end delivery interface (Next of future generation Generation Fronthaul Interface, NGFI) network architecture for the various scenes of 2G/3G/4G and 5G, passes through spirit Forward pass interface living completes the covering of various scenes.
It is desired under 5G scenes relative to traditional Long Term Evolution (Long Term Evolution, LTE) network design Distributed network architecture in, introduce base band centralized unit, its not introduce a high-level network element, but carry out base band Morphological Reconstruction between unit (Base Band Unit, BBU) and Remote Radio Unit (Radio Remote Unit, RRU), will Traditional BBU part processing function is moved on RRU, its reconstruct after be then respectively defined as centralized unit (Central Unit, CU) and distribution unit (Distributed Unit, DU) (or in the scene of some specific distributed network architectures, CU Also referred to as wireless cloud center (Radio Cloud Center, RCC), DU is also referred to as wireless remote system (Radio Remote System, RRS).Wherein, the part Base-Band Processing function radio frequency of antenna, RRU and traditional BBU can be included in DU The part of the functions such as polymerized unit (Radio Aggregation Unit, RAU), traditional BBU can be included in CU and removes RAU Outer remaining function and top management function etc..
Fig. 1 shows a kind of RCC-RRS distributed network architectures.Include in distributed network architecture as shown in Figure 1： RRS 101, RCC 102, NGFI 103 and rear end transmission 104 and core net 105.Wherein, RRS 101 can be one or Multiple, one or more RRS 101 may be coupled on a RCC 102, pass through transmission network between RRS 101 and RCC 102 Network connects.Based on the framework, the interaction between a kind of desired RCC and RRS is：RCC complete big data computing, then Instruction is sent to RRS, and RRS completes the corresponding resource allocation eated dishes without rice or wine on the basis of RCC operation results.Equally, each RRS to from The information for eating dishes without rice or wine to gather carries out reporting RCC after necessarily handling.RCC and RRS possesses air protocol stack and Base-Band Processing function, In order to reduce data transfer pressure between RCC and RRS, the function between RCC and RRS can be divided flexibly.
Due to protocol stack of being eated dishes without rice or wine in the distributed network architecture that is proposed under 5G scenes be separately operable it is real in different distributions On body, therefore, the agreement of traditional or desired transmission network wireless spread-spectrum technology (Radio Link Control, RLC) layer Stack function can not be directly useful in above-mentioned distributed network architecture.For above-mentioned distributed network architecture, it is necessary to redesign RLC protocol stack function is in distribution thereon, to adapt to the transmission network requirement in distributed network architecture, data processing time delay It is required that, data control (for example data when re-establishing are out of order submit) the various performance indications such as require.
The content of the invention
The embodiment of the present invention provides a kind of distributed base station system, CU, DU and data transmission method, to provide RLC's Distributed frame of the protocol stack function in distributed network architecture.
A kind of distributed base station system that one embodiment of the present of invention provides, the distributed base station system include collection Middle unit CU and M distribution unit DU, M being connected with the CU are positive integer；
The CU includes concentrating wireless spread-spectrum technology C-RLC protocol elements, and the distributed radio for data receiver Link controls D-RLC protocol elements；
The DU includes being used for the D-RLC protocol elements that data are sent.
Alternatively, corresponding one of a C-RLC protocol elements are unidirectional or double-direction radio carries RB；
The quantity of link of eating dishes without rice or wine according to corresponding to C-RLC protocol elements shared by unidirectional RB, a C-RLC protocol elements The D-RLC protocol elements for being used for data and sending of corresponding identical quantity, wherein, each D-RLC agreement lists sent for data The corresponding link of eating dishes without rice or wine of member；
The quantity of link of eating dishes without rice or wine shared by the two-way RB according to corresponding to C-RLC protocol elements, a C-RLC protocol elements The D-RLC protocol elements for being used for data transmission of corresponding identical quantity and the D-RLC agreements for data receiver of identical quantity Unit, wherein, one is used for the D-RLC protocol elements and the D-RLC protocol elements pair for being used for data receiver that data are sent Answer a link of eating dishes without rice or wine.
Alternatively, the C-RLC protocol elements, the last layer protocol element for caching the C-RLC protocol elements are sent out The data sent, and by the data distribution of caching to the D-RLC agreement lists for being used for data transmission corresponding to the C-RLC protocol elements Member；And/or
For receiving the data sent corresponding to the C-RLC protocol elements for the D-RLC protocol elements of data receiver, And the last layer protocol element of the C-RLC protocol elements is sent to after received data are recombinated.
Alternatively, the C-RLC protocol elements, are specifically used for：
After the data that the last layer protocol element for receiving the C-RLC protocol elements is sent, to medium education MAC protocol unit sends data distribution request；
Receive the data distribution instruction of the MAC protocol unit feedback；
Indicated according to the data distribution, the data distribution of caching is given and is used to count corresponding to the C-RLC protocol elements According to the D-RLC protocol elements of transmission.
Alternatively, the D-RLC protocol elements sent for data, for the C-RLC agreements list that will be received The data transfer of member distribution is to MAC protocol unit；
The D-RLC protocol elements for data receiver, the data that the MAC protocol unit for that will receive is sent pass C-RLC protocol elements corresponding to the defeated D-RLC protocol elements for being used for data receiver described in.
Alternatively, also include in the DU：Routing unit, the routing unit is corresponding to be sent with being used for data in the DU D-RLC protocol elements.
Alternatively, the routing unit is used for after the data that MAC protocol unit is sent are received, by received data It is sent in the DU and is used for the D-RLC protocol elements that data are sent, or received data is sent to and the DU phases It is used for the D-RLC protocol elements of data receiver in the CU of connection.
Alternatively, the C-RLC protocol elements are used for：According to the configuration information of RRC protocol elements, data hair is configured to The D-RLC protocol elements sent；And/or
Indicated according to the data distribution of MAC protocol unit, activate or deactivate and be used for corresponding to the C-RLC functional entitys The D-RLC protocol elements that data are sent.
A kind of CU that one embodiment of the present of invention provides, the CU include C-RLC protocol elements, and for data The D-RLC protocol elements of reception；The DU that the CU includes the D-RLC protocol elements sent for data with M is connected, M For positive integer.
Alternatively, corresponding one of a C-RLC protocol elements are unidirectional or double-direction radio carries RB；
The quantity of link of eating dishes without rice or wine according to corresponding to C-RLC protocol elements shared by unidirectional RB, a C-RLC protocol elements The D-RLC protocol elements for being used for data and sending of corresponding identical quantity, wherein, each D-RLC agreement lists sent for data The corresponding link of eating dishes without rice or wine of member；
The quantity of link of eating dishes without rice or wine shared by the two-way RB according to corresponding to C-RLC protocol elements, a C-RLC protocol elements The D-RLC protocol elements for being used for data transmission of corresponding identical quantity and the D-RLC agreements for data receiver of identical quantity Unit, wherein, one is used for the D-RLC protocol elements and the D-RLC protocol elements pair for being used for data receiver that data are sent Answer a link of eating dishes without rice or wine.
Alternatively, the C-RLC protocol elements, the last layer protocol element for caching the C-RLC protocol elements are sent out The data sent, and by the data distribution of caching to the D-RLC agreement lists for being used for data transmission corresponding to the C-RLC protocol elements Member；And/or
For receiving the data sent corresponding to the C-RLC protocol elements for the D-RLC protocol elements of data receiver, And the last layer protocol element of the C-RLC protocol elements is sent to after received data are recombinated.
Alternatively, the C-RLC protocol elements, are specifically used for：
After the data that the last layer protocol element for receiving the C-RLC protocol elements is sent, to medium education MAC protocol unit sends data distribution request；
Receive the data distribution instruction of the MAC protocol unit feedback；
Indicated according to the data distribution, the data distribution of caching is given and is used to count corresponding to the C-RLC protocol elements According to the D-RLC protocol elements of transmission.
Alternatively, the C-RLC protocol elements are used for：According to the configuration information of RRC protocol elements, data hair is configured to The D-RLC protocol elements sent；And/or
Indicated according to the data distribution of MAC protocol unit, activate or deactivate and be used for corresponding to the C-RLC functional entitys The D-RLC protocol elements that data are sent.
A kind of DU that one embodiment of the present of invention provides, the DU include being used for the D-RLC agreement lists that data are sent Member；The DU is connected to the CU for including C-RLC protocol elements and the D-RLC protocol elements for data receiver.
Alternatively, the D-RLC protocol elements sent for data, for by the C-RLC in the CU received The data transfer of protocol element distribution is to MAC protocol unit.
Alternatively, in addition to：Routing unit, the corresponding D-RLC sent with being used for data in the DU of the routing unit Protocol element.
Alternatively, the routing unit is used for after the data that MAC protocol unit is sent are received, by received data It is sent in the DU and is used for the D-RLC protocol elements that data are sent, or received data is sent to and the DU phases It is used for the D-RLC protocol elements of data receiver in the CU of connection.
A kind of data transmission method that one embodiment of the present of invention provides, application and distributed base station system, described point Cloth base station system includes CU and M DU being connected with the CU, and M is positive integer；
This method includes：
The data that C-RLC protocol elements in the CU are sent to the last layer protocol element of the C-RLC protocol elements Cached；
C-RLC protocol elements in the CU by the data distribution of caching to be connected to it is in the DU of the CU, with it is described The D-RLC protocol elements sent corresponding to C-RLC protocol elements for data；
The D-RLC protocol elements that data are sent that are used in the DU distribute the C-RLC protocol elements received Data transfer to MAC protocol unit.
A kind of data transmission method that one embodiment of the present of invention provides, application and distributed base station system, described point Cloth base station system includes CU and M DU being connected with the CU, and M is positive integer；
This method includes：
The D-RLC protocol elements for data receiver in the CU receive the data that MAC protocol unit is sent；
The D-RLC protocol elements for data receiver in the CU are by received data transfer into the CU , corresponding with the D-RLC protocol elements for data receiver C-RLC protocol elements；
The C-RLC protocol elements will be used for the D- of data receiver corresponding to the received C-RLC protocol elements The data of rlc protocol unit transmission are sent to the last layer protocol element of the C-RLC protocol elements after being recombinated.
Alternatively, the data that the MAC protocol unit is sent are that the routing unit being connected in the DU of the CU is receiving To MAC protocol unit send data after and determine by received MAC protocol unit send data transfer to the DU After being used for the D-RLC protocol elements of data receiver in the CU being connected, the D-RLC for data receiver into the CU Protocol element transmission.
The CU and M being connected with CU are mainly included in the distributed base station system that the above embodiment of the present invention provides DU, M are positive integer, in the above embodiment of the present invention, mainly include C-RLC protocol elements in CU, and for data The D-RLC protocol elements of reception；It is main in DU to include being used for the D-RLC protocol elements that data are sent, so as to provide one kind Distributed frame of the RLC protocol stack function in distributed network architecture.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these accompanying drawings His accompanying drawing.
Fig. 1 is the schematic diagram of RCC-RRS distributed network architectures under 5G scenes in the prior art；
Fig. 2 is by the schematic diagram of the basic idea of rlc protocol unit score formula separation in the embodiment of the present invention；
Fig. 3 is rlc protocol unit in the embodiment of the present invention according to the total and fractional structural representation separated；
Fig. 4 is a kind of structural representation of distributed base station system provided in an embodiment of the present invention；
Decomposing schematic representation of the rlc protocol stack function that Fig. 5 is provided by the embodiment of the present invention in distributed base station system；
Decomposition and placement of the rlc protocol stack function that Fig. 6 is provided by the embodiment of the present invention in distributed base station system Schematic diagram；
The rlc protocol stack function that Fig. 7 is provided by the embodiment of the present invention is in the unified platform of distributed base station system Decomposition and placement schematic diagram；
Fig. 8 is that rlc protocol stack function carries out work(in distributed base station system under TM patterns provided in an embodiment of the present invention The schematic diagram that can split and place；
Fig. 9 is by TM C-RCL, TM D-RLC under the distributed frame provided in an embodiment of the present invention based on shown in Fig. 8Tx And TM D-RLCRxThe schematic diagram of the data transmission procedure of realization；
Figure 10 is the CU that some embodiments of the invention provide；
Figure 11 is the DU that some embodiments of the invention provide；
Figure 12 is the data transmission method that some embodiments of the present invention provide；
Figure 13 is the data transmission method that some embodiments of the present invention provide.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into One step it is described in detail, it is clear that the described embodiment only a part of embodiment of the present invention, rather than whole implementation Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made All other embodiment, belongs to the scope of protection of the invention.
In traditional LTE network, the framework of LTE protocol stack is designed according to the natural layering of agreement, wherein Include wireless heterogeneous networks (Radio Resource Control, RRC) layer, PDCP (Packet Data Convergence Protocol, PDCP) layer, radio link control (Radio Link Control, RLC) layer, media connect Enter control (Media Access Control, MAC) layer and physics (Physical Layer, PHY) layer etc..Traditional LTE associations View stack is planned that the processing between each cell is independently carried out in units of cell.
On the function of each protocol layer, it is well known to those skilled in the art, because the application is primarily upon RLC's Distribution design of the protocol stack function in distributed base station system, therefore, the protocol layer being only related to below to the application is brief Illustrate, other protocol layers will not be described further.It should be pointed out that the processing on each protocol layer, for example, at PDCP agreements Reason, MAC protocol processing, can not lie in this, its concrete operations content is not formed with standard agreement coevolving, the improvement of the application Limitation to the application.
For the ease of statement, in the description of the present application, the function of each protocol layer agreement as corresponding to each protocol layer Unit performs.Such as：Rlc protocol unit belongs to rlc layer to perform the protocol element of RLC protocol stack function；RRC agreement lists Member belongs to rrc layer to perform the protocol element of the function of rrc layer；PDCP protocol elements are the agreement for the function of performing PDCP layers Unit, belong to PDCP layers；MAC protocol unit belongs to MAC layer to perform the protocol element of the function of MAC layer.
It should be appreciated that protocol element corresponding to each protocol layer is referred to as functional module, entity, function reality Body, logic entity or pseudo-entity etc.；It is specifically as follows software form, can be realized by computing device program code Its corresponding function, or can also be example, in hardware, specific implementation of the application to protocol element corresponding to each protocol layer Do not do any restrictions.
In traditional LTE network, rlc layer is mainly used in transferring data to the rlc layer at reciprocity end, specifically, is sending out Sending end, rlc layer are mainly used in data sectional and/or restructuring, and available for HARQ (Automatic Repeat- ReQuest, ARQ) associative operation, for example transmission or sequence be sent to upper strata etc.；Correspondingly, it is main in receiving terminal, rlc layer For data recombination, ARQ associative operations.
In this application, transmitting terminal refers to the equipment for sending packet, can be specifically base station eNB or terminal UE etc.；Connect Receiving end refers to the equipment for receiving the packet, can be specifically eNB or UE etc..Such as transmitting terminal eNB, receiving terminal UE, ENB sides are configured with rlc protocol unit, and UE sides are configured with the rlc protocol unit of equity；Or again for example, transmitting terminal UE, receive Hold and be configured with rlc protocol unit for eNB, UE sides, eNB sides are configured with the rlc protocol unit of equity；Deng.
Before rlc layer provides service, rlc protocol unit is established.In the clothes that control plane, rlc layer provide to upper strata Business is Signaling Radio Bearer (Signaling Radio Bearer, SRB), in the service that user plane, rlc layer provide to upper strata For radio bearer (Radio Bearer, RB).Multiple different rlc protocol units, a RLC association can be established in one rlc layer View unit is responsible for sending RLC PDU to the rlc protocol unit at reciprocity end, or receives the RLC of the rlc protocol unit at reciprocity end PDU。
Specifically, rlc protocol unit can be by service access point (Service Access Point, SAP) from upper strata Protocol element (pair with CCCH CCCH be RRC protocol elements, be otherwise PDCP protocol elements) reception RLC business datums Unit (RLC SDU), then after the RLC SDU of reception construct rlc protocol data cell (RLC PDU), believed by logic Road is distributed to lower-layer protocols unit (MAC protocol unit)；Rlc protocol unit can be connect by logic channel from MAC protocol unit RLC PDU are received, after the RLC PDU of reception construct RLC SDU, PDCP protocol elements are delivered to by SAP.Wherein, come from The RLC PDU that the RLC SDU of PDCP layers are formed, only MAC layer are just transmitted when notice has transmission opportunity.
The configuration of rlc layer is generally controlled by rrc layer, specifically, rrc layer can configure the relevant parameter of rlc layer, such as RLC Protocol element, data-transmission mode, SN size, encoding scheme etc..
And with the continuous evolution of architectures of communication networks, the 5G network architectures propose the distributed structure/architecture of access network, empty Mouth protocol stack is separately operable in different equipment entities, and the transmission between distributed entities can be non-ideal transmission, because This needs to consider the segmentation reconstruct to protocol stack function.
In this application, describe for convenience, the distributed network architecture proposed under 5G scenes is expressed as CU-DU points The cloth network architecture, it should be appreciated that CU can also specifically be expressed as RCC, and DU can specifically be expressed as RRS, CU-DU distributions The formula network architecture specifically can be as illustrated in FIG. 1 RCC-RRS distributed network architectures.
To CU-DU distributed network architectures, it is necessary to RLC protocol stack function be redesigned in distribution thereon, to meet Transmission network requirement, data processing delay requirement, data control (number when such as re-establishing in CU-DU distributed network architectures Submitted according to out of order) require etc. various performance indications.
A kind of existing technical scheme is that segmentation reconstruct is carried out between PDCP and RLC, is increased in PDCP protocol functions PDCP PDU reordering function, RLC function keep constant.Many deficiencies be present in this technical scheme, than if desired for Ranking function of the increase to packet in PDCP agreements；Need increases a whole set of in PDCP agreements completely sequentially sends and connects Receipts reorder mechanism, very big etc. to PDCP protocol changes, have not only obscured RLC and PDCP function division, also destroy by RLC is responsible for the principle of the protocol stack function division of data packet sequencing.
For above-mentioned distributed network architecture to the segmentation reconfiguration requirement and current PDCP and RLC of protocol stack function it Between function segmentation reconstruct the problem of existing, the present invention proposes a kind of distributed base station system, CU, DU and transmission side data Method, to provide a kind of technical scheme of the protocol stack function for the distributed setting RLC being adapted with distributed network architecture.
The technical scheme that the embodiment of the present invention is provided mainly is entered to the rlc protocol stack function in distributed network architecture Overall being discretely located to part and data transmit-receive function is gone, it is understood that for by the RLC in distributed network architecture The segmentation of protocol stack function is reconstructed into the distributed frame of total and fractional and data transmit-receive function separation.
In various embodiments of the present invention, mainly radio link is concentrated to control by the way that rlc protocol unit is separated into (Centralized RLC, C-RLC) protocol element, for data receiver distributed radio link control (Distributed, D-RLC) protocol element and the D-RLC protocol elements sent for data, and by isolated C-RLC protocol elements and incite somebody to action D-RLC protocol elements for data receiver are positioned over CU, by the D-RLC protocol elements sent for data placement and DU On, the separation for realizing totality of the rlc protocol stack function in distributed network architecture to part and data transmit-receive function is put Put.
Or more specifically, it is understood that the technical scheme that the embodiment of the present invention is provided is by being first according to C- The basic function of rlc protocol unit and D-RLC protocol elements is set, and rlc protocol Elementary Function is carried out totally to be discretely located, then The data receiver functional module and data sending function module of D-RLC protocol elements (or D-RLC functions for data receiver Module and for data send D-RLC functional modules) carry out function be discretely located, realize rlc protocol stack function and be distributed Totality in the formula network architecture is discretely located to part and data transmit-receive function.
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Distributed base station system, CU, DU and the data transfer provided for the clearer explanation embodiment of the present invention The technical scheme of method, the base for carrying out total and fractional separation in the present invention to rlc protocol Elementary Function will be briefly introduced first below Plinth is conceived, it should be appreciated that the thought of the total and fractional separation of rlc protocol unit is the part in the technology of the present invention design.
Fig. 2 is shown the schematic diagram of the basic idea of rlc protocol unit score formula separation in embodiments of the present invention.Such as Shown in Fig. 2, RLC protocol stack function is divided into C-RLC protocol elements (C-RLC 201 as depicted) and D-RLC agreements Unit (D-RLC 202 as depicted) two parts.Wherein, each D-RLC protocol elements 202 are a branch link (Branch Of the Radio Link), a C-RLC protocol elements 201 can correspond to multiple D-RLC protocol elements 202, C-RLC agreements The corresponding each UE of unit 201 RB, the link of eating dishes without rice or wine that each D-RLC protocol elements 202 are responsible for UE provide data Transmission-receiving function.
Specifically, as shown in Fig. 2 PDCP protocol elements (PDCP 203 as depicted) pass to C-RLC protocol elements 201 Transmission of data, C-RLC protocol elements 201 are given the data distribution received to each D-RLC protocol elements 202, assisted by each D-RLC The data being assigned to are transferred to MAC protocol unit (MAC 204 as depicted) by view unit 202；MAC protocol unit 204 to Each D-RLC protocol elements 202 transmit data, and each D-RLC protocol elements 202 assist the data transfer received to C-RLC Unit 201 is discussed, PDCP protocol elements 203 are transferred to after the data received are combined by C-RLC protocol elements 201.Wherein, C- Connection between rlc protocol unit and D-RLC protocol elements can be interacted by NGFI nonideal transmission network, can To be interacted by preferable transmission network.
Further, according to the RLC of C-RLC protocol elements and D-RLC protocol elements as shown in Figure 2 protocol stack function Distribution, Fig. 3 show that rlc protocol unit is according to the structural representation after total and fractional separated in embodiments of the present invention.
As shown in figure 3, rlc protocol unit is separated into C-RLC protocol elements 301 and multiple D-RLC agreements according to total and fractional Unit 302, specially on the basis of original rlc protocol unit, C-RLC protocol elements are added, D-RLC protocol elements have The function of original rlc protocol unit.It can be seen that the skill for separating rlc protocol unit score formula as shown in FIG. 2 and 3 Art design is on the basis of original rlc protocol entity, adds C-RLC protocol elements, and D-RLC protocol elements perform original The function of rlc protocol entity, i.e., new processing function is added on the basis of compatible existing rlc protocol stack function, it is not right PDCP protocol functions produce any influence.
Function and CU-DU distributed network architectures with reference to possessed by current rlc protocol unit, the embodiment of the present invention is preceding State on the basic technology concept shown in Fig. 2 and Fig. 3, there is provided a kind of rlc protocol stack work(by distributed network structure The technical scheme for being reconstructed into the distributed frame that total and fractional and data transmit-receive function is discretely located can be split.
It is a kind of structural representation of distributed base station system provided in an embodiment of the present invention referring to Fig. 4.
Include in distributed base station system provided in an embodiment of the present invention as shown in Figure 4 CU 401 and with the CU 401 The M DU 402 of connection, M are positive integer.
Wherein, connected between CU 401 and DU 402 by transmission network, interaction can be found in foregoing to shown in Fig. 1 The description of distributed network architecture.CU 401 and DU 402 possess air protocol stack and Base-Band Processing function.
Specifically, in distributed base station system provided in an embodiment of the present invention as shown in Figure 4, CU 401 includes C- Rlc protocol unit 403, and the D-RLC protocol elements 404 for data receiver；DU 402 includes being used for what data were sent D-RLC protocol elements 405.
It should be appreciated that also include protocol element corresponding to other protocol layers in CU and DU, due to not being related to this hair Bright improvement, therefore, protocol element corresponding to the rlc protocol layer that will only describe in CU and DU in the present invention, to other associations Protocol element corresponding to view layer is not introduced specifically.
Specifically, a C-RLC protocol elements 403 can correspond to a unidirectional or double-direction radio carrying RB.
Further, the D-RLC protocol elements 405 each sent for data are responsible for a UE link offer of eating dishes without rice or wine The sending function of data；The link of eating dishes without rice or wine that each D-RLC protocol elements 404 for data receiver are responsible for UE provides number According to receive capabilities.
Wherein, due in existing rlc protocol each RB be associated with a PDCP protocol elements, each PDCP agreements Unit is associated with one or two (uplink and downlink) rlc protocol unit, this depend on and the characteristics of RB (unidirectional or two-way) and The transmission mode of rlc layer.Thus, C-RLC agreements are being separated into original rlc protocol unit score formula in embodiments of the present invention When unit 403 and D-RLC protocol elements 404 for data receiver and the D-RLC protocol elements 405 sent for data, Corresponding relation between above-mentioned PDCP protocol elements and rlc protocol unit also correspondingly changes.
Further, because a CU can correspond to multiple DU, for two-way RB, the D- for data receiver on CU Rlc protocol unit 404 and for data send D-RLC protocol elements 405 correspond, have on each DU one be used for count According to the D-RLC protocol elements 405 of transmission, there are multiple D-RLC protocol elements 404 for data receiver, the sum of the two on CU Mesh is identical.For unidirectional RB, the D-RLC agreement lists for the D-RLC protocol elements 404 of data receiver and for data transmission Member 405 will not have pairing restriction relation, and number therebetween does not have any relation.
Specifically, the quantity of the link of eating dishes without rice or wine according to corresponding to C-RLC protocol elements 403 shared by unidirectional RB, a C- Rlc protocol unit 403 can correspond to the D-RLC protocol elements 405 for being used for data and sending of identical quantity, wherein, each it is used for The corresponding link of eating dishes without rice or wine of D-RLC protocol elements 405 that data are sent.
Specifically, the quantity of the link of eating dishes without rice or wine shared by the two-way RB according to corresponding to C-RLC protocol elements 403, a C- Rlc protocol unit 403 can correspond to the D-RLC protocol elements 405 for being used for data transmission of identical quantity and the use of identical quantity In the D-RLC protocol elements 404 of data receiver, wherein, one is used for the D-RLC protocol elements 405 and a use that data are sent In the corresponding link of eating dishes without rice or wine of the D-RLC protocol elements 404 of data receiver.
In some embodiments of the invention, C-RLC protocol elements 403 can be used for caching C-RLC protocol elements 403 The data that last layer protocol element is sent, and the data distribution of caching can be used for corresponding to C-RLC protocol elements 403 The D-RLC protocol elements 405 that data are sent.
In some embodiments of the invention, it is right to can be used for reception C-RLC protocol elements 403 for C-RLC protocol elements 403 The data that the D-RLC protocol elements 404 for data receiver answered are sent, and sent after received data are recombinated To the last layer protocol element of C-RLC protocol elements 403.
In some specific embodiments of the present invention, C-RLC protocol elements 403 can specifically include a concentration of transmissions Cache pool (Centralized Transmission buffer), when sending data, cache the upper of C-RLC protocol elements 403 The data that one level agreement unit is sent, and when distributing data to the D-RLC protocol elements 405 sent for data, will send SDU to each D-RLC protocol elements 405 sent for data forms a RLC SDU cluster (cluster), RLC SDU RLC SDU in cluster are sent to each D-RLC protocol elements 405 sent for data according to reception order, and not RLCSDU is cut, that ensure to send is all a complete RLC SDU；When receiving data, completion is multiple to be used for data The sequence for the RLC SDU cluster data that the D-RLC protocol elements 404 of reception report, and reported according to correct order Layer.
In some embodiments of the invention, the D-RLC protocol elements 405 sent for data, can be used for receiving The data transfer that the C-RLC protocol elements 403 that arrive are distributed is to MAC protocol unit 406.
In some embodiments of the invention, D-RLC protocol elements 404 for data receiver, for that will receive C-RLC agreement lists corresponding to the data transfer that MAC protocol unit 406 is sent to the D-RLC protocol elements 404 for data receiver Member 403.
In some specific embodiments of the present invention, for the D-RLC protocol elements 405 of data transmission, it can specifically wrap A transmission buffer pond (Transmission buffer) is included, for receiving RLC SDU from C-RLC protocol elements 403 After multiple RLC SDU packets in cluster, the sequentially transmission of data is performed, include the cascade plus head, re-transmission etc. of data Function；Correspondingly, the D-RLC protocol elements 404 for data receiver, received in-order and restructuring specifically for performing data, According to RLC SDU cluster correctly sequentially data delivery to C-RLC protocol elements 403.
Specifically, in some embodiments of the invention, C-RLC protocol elements 403 and the D-RLC associations sent for data Discuss between unit 405 and C-RLC protocol elements 403 and for being not required between the D-RLC protocol elements 404 of data receiver The information of any data volume control is interacted, is directly interacted by transceiving data bag.The D-RLC agreements sent for data Unit 405 need not send request of data to C-RLC protocol elements 403, and C-RLC protocol elements 403 are used for data according to each The data throughout distribution data that the D-RLC protocol elements 405 of transmission are sent.Each D-RLC agreement lists for being used for data receiver The data of reception are sent to C-RLC protocol elements 403 by member 404, and C-RLC protocol elements 403 as defined in agreement according to sequentially entering Row sequence, then sequentially gives PDCP protocol elements.Each D-RLC protocol elements 404 for data receiver receive data When according to the sequential delivery of transmission to C-RLC protocol elements 403, C-RLC protocol elements 403 are responsible for coming from what is received Sequence with the packet of the different D-RLC protocol elements 404 for data receiver is combined.
Further, in some embodiments of the invention, C-RLC protocol elements 403, specifically can be used for receiving After the data that the last layer protocol element of C-RLC protocol elements 403 is sent, data distribution request is sent to MAC protocol unit；Connect Receive the data distribution instruction of MAC protocol unit feedback；And indicated according to data distribution, by the data distribution of caching to C-RLC The D-RLC protocol elements 405 sent corresponding to protocol element 403 for data.
Alternatively, in some embodiments of the invention, C-RLC protocol elements 403, are specifically used for：According to RRC agreement lists The configuration information of member, it is configured to the D-RLC protocol elements 405 of data transmission；And/or according to the data of MAC protocol unit point With instruction, the D-RLC protocol elements 405 corresponding to activation or deactivation C-RLC protocol elements for data transmission.
Alternatively, C-RLC protocol elements and the D-RLC agreements sent for data corresponding with C-RLC protocol elements Unit and the D-RLC protocol elements for data receiver, it can be created, configured and discharged by RRC protocol elements.
Further, it is contemplated that rlc protocol unit can be configured to one of lower three kinds of data-transmission modes to perform number According to transmission：Transparent mode (Transparent Mode, TM), Unacknowledged Mode (Unacknowledged Mode, UM) confirm Pattern (Acknowledged Mode, AM).The data-transmission mode being configured according to rlc protocol unit, rlc protocol unit can To be categorized as TM rlc protocols unit, UM rlc protocols unit or AM rlc protocol units.
Specifically, a TM rlc protocols unit can be configured as sending TM rlc protocol units (transmitting TM RLC entity) or reception TM rlc protocols unit (receiving TM RLC entity)；One UM rlc protocol Unit can be configured as sending UM rlc protocols unit (transmitting UM RLC entity) or receive UM RLC Protocol element (receiving UM RLC entity)；One AM rlc protocols unit can include a transmitting portion (transmitting side) and receiving portion (receiving side)；Also include road in AM rlc protocol units By Routing funtion parts.Correspondingly it is appreciated that being configured to work under TM patterns or carrying out data transmission under UM patterns Rlc protocol unit, receive capabilities and sending function are separated from each other execution, need not interact, be configured as each other Be operated in the rlc protocol unit carried out data transmission under AM patterns, be have simultaneously reception and sending function, receiving portion and Need to interact between transmitting portion.
In addition, being directed to CU-DU distributed network architectures, divide according in the function of rlc protocol stack function, rlc protocol list Member can also be divided into Low RLC funtion parts and High RLC funtion parts, and Low RLC funtion parts are located in DU, High RLC funtion parts are located in CU.Low RLC funtion parts and High RLC funtion parts complete the entirety of rlc protocol stack jointly Function.
Specifically, High RLC funtion parts, which can include, receives TM rlc protocols unit, receives UM rlc protocol lists Receiving portion in member and AM rlc protocol units, correspondingly, can be expressed as TM High RLC, UM High RLC And AM High RLC；Low RLC funtion parts, which can include, to be sent TM rlc protocols unit, sends UM rlc protocol lists Member and AM rlc protocol units in transmitting portion, correspondingly, can be expressed as TM Low RLC, UM Low RLC with And AM Low RLC；Especially, for AM rlc protocol units, the route Routing funtion parts in AM rlc protocol units It can be located on AM Low RLC mono- in DU.
Further, the C-RLC protocol elements provided in some embodiments of the present invention and the D- sent for data Rlc protocol unit and the D-RLC protocol elements for data receiver, above-mentioned three kinds of data-transmission modes and phase can be based on The rlc protocol unit answered is configured, such as by RRC protocol elements by the C-RLC provided in some embodiments of the present invention Protocol element and the D-RLC protocol elements sent for data and it is configured to for the D-RLC protocol elements of data receiver State any of three kinds of data-transmission modes data-transmission mode to carry out data transmission, so as to ensure to three kinds of data transfer moulds The compatibility of formula.
Specifically, the C-RLC protocol elements provided in some embodiments of the present invention and the D-RLC sent for data Protocol element and the D-RLC protocol elements for data receiver, appointing in above-mentioned three kinds of data-transmission modes are configured as During a kind of data-transmission mode, C-RLC protocol elements may be used to cache the data that upper-layer protocol unit is sent and be distributed to The D-RLC protocol elements sent for data, and the D-RLC protocol elements that can be used for receiving each for data receiver are sent Data and by the data recombination received and be delivered to upper-layer protocol unit.
Further, for being configured as TM patterns or UM patterns in the case ofs of carrying out data transmission, the one of the present invention It is configured as a bit in the embodiment that TM patterns carry out data transmission, the D-RLC protocol elements sent for data can be used for holding Row sends function (such as transmission buffer) possessed by TM rlc protocol units, and the D-RLC protocol elements for data receiver can Function possessed by TM rlc protocol units is received for performing；Some in the present invention are configured as UM patterns progress data In the embodiment of transmission, the D-RLC protocol elements for data transmission, which can be used for execution transmission UM rlc protocol units, to be had Some functions (such as transmission buffer, segmentation and cascade, addition PDU), the D-RLC protocol elements for data receiver can be used In perform receive UM rlc protocol units possessed by function (such as order caching and HARQ reorder, removes PDU, SDU weigh Group).
Further, for being configured as AM patterns in the case ofs of carrying out data transmission, because AM rlc protocol units are specific It may include transmitting portion and receiving portion, the friendship between receiving portion and transmitting portion realized by route Routing funtion parts Mutually, correspondingly, in some embodiments of the invention, the D-RLC protocol elements for data receiver are sent with being used for data Also need to realize interaction between D-RLC protocol elements.
Alternatively, in some embodiments of the invention, routing unit is also included in DU, routing unit corresponds to and DU In be used for data send D-RLC protocol elements.
Specifically, routing unit, can be used for after the data that MAC protocol unit is sent are received, by received number The D-RLC protocol elements for being used for data in DU according to being sent to and sending, or received data are sent to what is be connected with DU It is used for the D-RLC protocol elements of data receiver in CU.
Specifically, some in the present invention are configured as in the embodiment that AM patterns carry out data transmission, and are sent out for data The D-RLC protocol elements sent can be used for perform AM rlc protocol units in transmitting portion function (such as transmission buffer, point Section caches with cascade, addition PDU, re-transmission), routing unit can be used for performing the route in AM rlc protocol units Routing funtion parts (for example the data for being responsible for determining to receive are sent to the D-RLC protocol elements sent for data, Also it is sent to the D-RLC protocol elements for data receiver), the D-RLC protocol elements for data receiver can be used for holding Receiving portion in row AM rlc protocol units function (such as order caching and HARQ reorder, remove PDU, SDU weight Group).
In view of in the function of the above-mentioned rlc protocol stack function in CU-DU distributed network architectures points, the one of the present invention In a little embodiments, correspondingly function division can also be carried out in the way of in above-mentioned rlc protocol stack function points.Such as in this hair In some bright embodiments, High RLC funtion parts can include C-RLC protocol elements and the D-RLC for data receiver Protocol element, Low RLC funtion parts can include the D-RLC protocol elements sent for data；Again such as in the present invention Some embodiments in, the D-RLC protocol elements that are sent for data and for the D-RLC protocol elements of data receiver pass through road Interacted by unit, High RLC funtion parts can include C-RLC protocol elements and the D-RLC for data receiver is assisted Unit is discussed, Low RLC funtion parts can include the D-RLC protocol elements sent for data and routing unit.
Fig. 5 gives the decomposition of rlc protocol stack function that the embodiment of the present invention is provided in distributed base station system and shown It is intended to.Wherein, D-RLCTxRepresent the D-RLC protocol elements sent for data, D-RLCRxRepresent the D- for data receiver Rlc protocol unit, Routing represent routing unit.
Wherein, the function of C-RLC protocol elements, which defines, to be defined with the function of the C-RLC protocol elements shown in Fig. 3 It is identical.D-RLCTx, D-RLCRxThen it can be understood as to the D-RLC agreement lists shown in Fig. 3 with tri- functional units of Routing The various pieces that the Function Decomposition of member obtains.C-RLC protocol elements with by D-RLCTx, D-RLCRxThe D- formed with Routing The logical relation of rlc protocol unit is same as shown in Figure 2.D-RLCTxIt is responsible for the transmission processing of data, D-RLCRxIt is responsible for data Reception processing, Routing functions are responsible for determining the data received being sent to D-RLCTxOr D-RLCRx。
For TM/UM patterns, because D-RLCTxAnd D-RLCRxBetween need not interact, therefore Routing work(can not needed Energy.For AM patterns, because D-RLCTxAnd D-RLCRxBetween need to interact, therefore need Routing functions.
Further, Fig. 6 shows rlc protocol stack function that the embodiment of the present invention is provided in distributed base station system Decomposition and placement schematic diagram.
As shown in fig. 6, routing unit 601 is further contained on the basis of Fig. 4.Wherein, C-RLC protocol elements 403 and (the D-RLC of D-RLC protocol elements 405 for data transmissionRx) be placed on CU, the D-RLC agreements for data receiver (the D-RLC of unit 405Tx) function is placed on DU, routing unit 601 with the D-RLC protocol elements 405 for data receiver one by one It is corresponding, it is placed on DU.
Specifically as illustrated in FIG. 6, a CU can correspond to multiple DU, for two-way RB, CU D-RLCTxAnd D-RLCRx Correspond, have a D-RLC on each DUTxFunctional entity, there are multiple D-RLC on CURxEntity, the total number of the two are identical. For unidirectional RB, D-RLCTxAnd D-RLCRxWithout pairing restriction relation, number therebetween does not have any relation.For Routing unit 601 (Routing functions), exists in the case where being configured to AM patterns, can be not present in TM or UM patterns are configured to, It is also disposed on DU, and in D-RLCTxCorrespond, the responsible data for determining to receive are to stay on DU to handle, and are also sent to Handled on CU.
Further, C-RLC protocol elements and for data send D-RLC protocol elements between and C-RLC agreements Unit and for can be interacted between the D-RLC protocol elements of data receiver by NGFI nonideal transmission network, It can also be interacted by preferable transmission network.
For such as Fig. 6 distributed base station system, the connected mode between CU and DU can specifically have two kinds, and one kind is two Time delay between person is less than certain criteria thresholds, i.e., the requirement of so-called desired transmission；Another is time delay therebetween Higher than certain criteria thresholds, i.e., the requirement of so-called non-ideal transmission；Wherein, desired transmission can refer to the base of integration Stand, protocol stack is not separated by, or although separating, transmission is fiber direct connection, propagation delay time and current CPRI The propagation delay time of (Common Public Radio Interface, common public radio interface) in an order of magnitude, or Person is the transmission of the data interaction requirement between the protocol entity of other real-time sexual satisfaction protocol stacks；Conversely, it is then non-ideal transmission. Under two kinds of transmission means, the placement schemes shown in Fig. 6 can be completely compatible.
Specifically, under desired transmission, C-RLC protocol elements as shown in Figure 6, D-RLCTx, D-RLCRxAnd Routing Interaction real-time between four is more preferable, and redundant measure is more succinct；Under non-ideal transmission, C-RLC protocol elements, D-RLCTx, D-RLCRxInteraction poor real between Routing some, but newly-increased redundant measure can fully meet requirement.
Fig. 7 shows that the rlc protocol stack function that the embodiment of the present invention is provided is put down in the integration of distributed base station system The schematic diagram of decomposition and placement in platform.It can be seen that C-RLC protocol elements, D-RLCTx, D-RLCRxIt is complete with Routing functions Portion is placed on unified platform, and logical relation is identical with distributed network architecture.
With reference to described above, it can be seen that the technical scheme that the embodiment of the present invention is provided mainly provides a kind of by original The function segmentation of some rlc protocol units is reconstructed into the total and fractional and data transmit-receive function of adapting to distributed network architecture The technical scheme for the distributed frame being discretely located.The distributed base provided in order to illustrate more clearly of embodiments of the invention Stand system, below will be so that original rlc protocol unit be configured into TM patterns according to technical scheme provided in an embodiment of the present invention Under function be divided into C-RLC protocol elements, for data send D-RLCTx, and the D-RLC for data receiverRx's Exemplified by structure and the process carried out data transmission, exemplary description is carried out.
Fig. 8 show some embodiments of the present invention provide technical scheme in the case where being configured to TM patterns rlc protocol stack work( Can in distributed base station system function segmentation and place schematic diagram.
As shown in figure 8, original TM rlc protocols unit be divided into TM C-RLC protocol elements (TMC-RLC 801), TM D-RLC protocol elements (the TM D-RLC sent for dataTxAnd the TM D-RLC agreement lists for data receiver 802) Member (TM D-RLCRx803).Wherein, TM C-RLC 801 and TM D-RLCRx803 are placed on CU；TM D-RLCTx802 put Put on DU.
TM C-RLC 801 include newly-increased concentration of transmissions and cache 804 (Centralized Transmission Buffer) function, concentration of transmissions caching 804 are responsible for giving each TMD-RLC according to the order for issuing upper layer dataTxDivide on 802 Data are sent out, and control TM D-RLCTx802 foundation and deletion.
TM D-RLCTx802 include and the existing (Transmission of TM D-RLC protocol element identicals transmission buffer 805 Buffer) function, as traditional TM RLC data sending functions.
TM D-RLCRx803 function is traditional TM RLC data receiver functions, and packet is directly submitted to upper strata.
It can be seen that TM C-RLC801 are placed on CU, TM C-RLC can simultaneously coordinate and control multiple TM D-RLCTx The reception of 802 data.TM D-RLCTx802 are all put on DU, are sent so as to provide the data of real-time to bottom Support, and whole descending transmission can all avoid the influence of the propagation delay time that transmission network is brought between CU-DU on DU.
Further, for unified platform, TM C-RLC 801, TM D-RLCTx802 and TM D-RLCRx 803 Can all it be put on the distributed base station system of integration, or it can be appreciated that the Centralized shown in Fig. 8 Transmission buffer and Transmission buffer are all put into integrated base station.
Fig. 9 show based under the distributed frame shown in Fig. 8 by TM C-RCL, TM D-RLCTxAnd TM D-RLCRx The schematic diagram of the data transmission procedure of realization.
As shown in figure 9, for transmitting terminal (Tx), as TM C-RLC Centralized Transmission Buffer receives RRCcell(step 9001) after the data Data of transmission, TM C-RLC Centralized Transmission Buffer is to MACcellInitiate data distribution request Allocation Req (steps 9002), MACcellAccording to each small of monitoring Quality of eating dishes without rice or wine on area Cell, the Centralized Transmission buffer to TM C-RLC send data distribution and rung Allocation Resp (steps 9003) are answered, wherein, because each carrier units CC is only visible in MAC layer, rlc layer does not differentiate between Main carrier PCC and secondary carrier SCC, therefore, rlc layer need to be started at RLC according to each CC of terminal MAC scheduling results Reason, RLC PDU are generated, MAC layer is then sent to and is distributed to each CC, because MAC layer can distinguish each CC, can also manage It is self-existent for each CC to solve as MAC entity.TM C-RLC Centralized Transmission buffer roots According to the instruction of assignment response respectively to corresponding TM D-RLCTxTransmission buffer send several RLC SDU (buffer data) (step 9004), each TM D-RLCTxRLC PDU are sent to each carrier wave list in the conventional mode MAC on first CCCC(step 9005).
As shown in figure 9, for receiving terminal (Rx), the MAC on the carrier units CC of terminalCCRLC PDU are directly transmitted to arrive TM D-RLC on CURxHandled (step 9011), TM D-RLCRxDirectly give packet data delivery to upper strata (step 9012).
In summary, CU be provided in the distributed base station system provided in the embodiment of the present invention and is connected with CU M DU, M are positive integer；Mainly include C-RLC protocol elements, and the D-RLC protocol elements for data receiver in CU； It is main in DU to include being used for the D-RLC protocol elements that data are sent.It can be seen by the description of the above embodiment of the present invention Go out, the distributed base station system provided in the embodiment of the present invention realizes a kind of protocol stack function by RLC in distributed network The distributed frame of decomposition and placement in framework.
It can be seen that original rlc protocol dividing elements in the distributed base station system provided in the embodiment of the present invention The D-RLC protocol elements sent into C-RLC protocol elements and for data and the D-RLC protocol elements for data receiver Funtion part, wherein, the functions of C-RLC protocol elements can be understood as what's new and (caching, distribution (descending) and recombinate (up)), it can be managed for the D-RLC protocol elements of data transmission and for the function of the D-RLC protocol elements of data receiver Solve to be consistent with the function of existing rlc protocol unit.When sending data, C-RLC protocol elements are directly data distribution To the D-RLC protocol elements sent for data, the D-RLC protocol elements when receiving data for data receiver are directly number According to C-RLC protocol elements are sent to, the information of interaction data stream control is not needed each other.Therefore, the embodiment of the present invention is provided Technical scheme compatibility is good, is capable of compatible existing RLC protocol stack function, i.e., rlc protocol that can be in compatible 4G or 5G networks Unit, realize the group that can effectively support the various scene demands of 4G/5G of total and fractional RLC and CU-DU distributed network architectures Close.
It can be seen that, the technical scheme provided in the embodiment of the present invention is not related to be changed to any of PDCP layer functions simultaneously It is dynamic, any influence is not produced on PDCP protocol functions, overcome and carry out segmentation reconstruct between PDCP and RLC in the prior art Technical scheme many deficiencies.
Further, rlc protocol stack function is distributed in CU-DU in the technical scheme provided by the embodiment of the present invention C-RLC, i.e., be placed on CU by the placement in the formula network architecture, is coordinated by C-RLC and controls multiple D- sent for data Rlc protocol unit and/or the D-RLC protocol elements for data receiver, and the D-RLC protocol elements that will be sent for data It is placed on DU, support is sent so as to provide the data of real-time to bottom, and whole descending transmission is all on DU The influence of the propagation delay time that transmission network is brought between CU-DU can be avoided, you can the time delay brought with compatible discontinuous transmission, With good autgmentability, mass users can be quickly supported, the distributed network being applicable under the 5G scenes shown in above-mentioned Fig. 1 Network framework, it disclosure satisfy that transmission network requirement, data processing delay requirement, the data control of CU-DU distributed network architectures will The various performance indications such as seek.
Based on identical technical concept, the embodiment of the present invention also provides a kind of CU, and the CU can be specifically previous embodiment CU in the distributed base station system provided, the CU can apply the distributed base station system provided with previous embodiment.
Figure 10 shows that the CU1001 that some embodiments of the present invention provide, the CU1001 include C-RLC agreement lists Member 1002, and the D-RLC protocol elements 1003 for data receiver；The CU1001 and M includes for data transmission The DU of D-RLC protocol elements be connected, M is positive integer.
Wherein, corresponding one of a C-RLC protocol elements 1002 are unidirectional or double-direction radio carries RB；
The quantity of link of eating dishes without rice or wine according to corresponding to C-RLC protocol elements 1002 shared by unidirectional RB, a C-RLC agreement Unit corresponds to the D-RLC protocol elements for being used for data and sending of identical quantity, wherein, each D-RLC associations sent for data Discuss the corresponding link of eating dishes without rice or wine of unit；
The quantity of link of eating dishes without rice or wine shared by the two-way RB according to corresponding to C-RLC protocol elements 1002, a C-RLC agreement Unit corresponds to the D-RLC protocol elements for being used for data transmission of identical quantity and the D-RLC for data receiver of identical quantity Protocol element 1003, wherein, one is used for D-RLC protocol elements and the D-RLC association for being used for data receiver that data are sent Discuss the corresponding link of eating dishes without rice or wine of unit.
Specifically, C-RLC protocol elements 1002, what the last layer protocol element for caching C-RLC protocol elements was sent Data, and by the data distribution of caching to the D-RLC protocol elements for being used for data transmission corresponding to C-RLC protocol elements；With/ Or, for receiving the data sent corresponding to C-RLC protocol elements for the D-RLC protocol elements of data receiver, and will be connect The data received are sent to the last layer protocol element of the C-RLC protocol elements after being recombinated.
Alternatively, C-RLC protocol elements 1002, specifically for receiving the last layer agreement list of C-RLC protocol elements After the data that member is sent, data distribution request is sent to MAC protocol unit；The data distribution for receiving MAC protocol unit feedback refers to Show；Indicated according to the data distribution, by the data distribution of caching to the D- for being used for data transmission corresponding to C-RLC protocol elements Rlc protocol unit.
Alternatively, C-RLC protocol elements 1002 are used for the configuration information according to RRC protocol elements, are configured to data hair The D-RLC protocol elements sent；And/or indicated according to the data distribution of MAC protocol unit, activation or deactivation C-RLC functions are real The D-RLC protocol elements sent corresponding to body for data.
Specifically, the CU that some embodiments of the present invention provide as illustrated in FIG. 10 for details, reference can be made to previous embodiment institute The description related to CU in the distributed base station system of offer.
Based on identical technical concept, the embodiment of the present invention also provides a kind of DU, and the CU can be specifically previous embodiment DU in the distributed base station system provided, the DU can apply the distributed base station system provided with previous embodiment.
Figure 11 shows that the DU 1101 that some embodiments of the present invention provide, the DU 1101 include being used for data hair The D-RLC protocol elements 1102 sent；The DU1101, which is connected to, includes C-RLC protocol elements and the D- for data receiver On the CU of rlc protocol unit.
Specifically, the D-RLC protocol elements 1102 sent for data, for by the C-RLC in the CU received The data transfer of protocol element distribution is to MAC protocol unit.
Alternatively, the DU1101 also includes：Routing unit 1103, routing unit 1103 are corresponding with being used in the DU1101 In the D-RLC protocol elements 1102 that data are sent.
Alternatively, the routing unit 1103 in described DU1101, for receiving the data of MAC protocol unit transmission Afterwards, received data are sent to the D-RLC protocol elements for being used for data in the DU and sending, or by received number It is used for the D-RLC protocol elements of data receiver in the CU being connected according to being sent to the DU.
Specifically, the DU that some embodiments of the present invention provide as illustrated in FIG. 11 for details, reference can be made to previous embodiment institute The description related to DU in the distributed base station system of offer.
Based on identical technical concept, the embodiment of the present invention also provides a kind of data transmission method, and Figure 12 shows this hair The data transmission method that some bright embodiments provide, this method can be specifically the distributed base provided by previous embodiment System of standing performs, and this method can apply the distributed base station system provided with previous embodiment.The distributed base station system Include CU and M DU being connected with the CU, M is positive integer；
As shown in figure 12, this method includes：
Step 1201：The data that C-RLC protocol elements in CU are sent to the last layer protocol element of C-RLC protocol elements Cached；
Step 1202：The data distribution of caching is connected in CU DU and C- by the C-RLC protocol elements in CU The D-RLC protocol elements sent corresponding to rlc protocol unit for data；
Step 1203：The D-RLC protocol elements that data are sent that are used in DU distribute the C-RLC protocol elements received Data transfer to MAC protocol unit.
Specifically, before the data transmission method that some embodiments of the present invention provide as illustrated in FIG. 12 for details, reference can be made to State description related to downlink data transmission in the distributed base station system that embodiment is provided.
Based on identical technical concept, the embodiment of the present invention also provides a kind of data transmission method, and Figure 13 shows this hair The data transmission method that some bright embodiments provide, this method can be specifically the distributed base provided by previous embodiment System of standing performs, and this method can apply the distributed base station system provided with previous embodiment.The distributed base station system Include CU and M DU being connected with the CU, M is positive integer；
As shown in figure 13, this method includes：
Step 1301：The D-RLC protocol elements for data receiver in CU receive the data that MAC protocol unit is sent；
Step 1302：The D-RLC protocol elements for data receiver in CU are by received data transfer into CU , corresponding with the D-RLC protocol elements for data receiver C-RLC protocol elements；
Step 1303：C-RLC protocol elements will be used for the D- of data receiver corresponding to received C-RLC protocol elements The data of rlc protocol unit transmission are sent to the last layer protocol element of C-RLC protocol elements after being recombinated.
Alternatively, the data that MAC protocol unit is sent are that the routing unit being connected in the DU of the CU is receiving MAC After the data that protocol element is sent and determine the data transfer that received MAC protocol unit is sent to the DU being connected After being used for the D-RLC protocol elements of data receiver in the CU connect, the D-RLC agreements for data receiver into the CU Unit transmission.
Specifically, the data transmission method that some embodiments of the present invention provide as shown in fig. 13 that for details, reference can be made to foregoing The description related to transmitting uplink data process in the distributed base station system that embodiment is provided.
For software implementation, these technologies can use module (such as program, the function etc. for realizing function described herein Deng) realize.Software code can store in a memory cell, and by computing device.Memory cell can handled Realize in device or outside processor.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims (20)

  1. A kind of 1. distributed base station system, it is characterised in that the distributed base station system include centralized unit CU and with institute M distribution unit DU, M for stating CU connections are positive integer；
    The CU includes concentrating wireless spread-spectrum technology C-RLC protocol elements, and the distributed radio link for data receiver Control D-RLC protocol elements；
    The DU includes being used for the D-RLC protocol elements that data are sent.
  2. 2. distributed base station system as claimed in claim 1, it is characterised in that the corresponding list of a C-RLC protocol elements To or double-direction radio carrying RB；
    The quantity of link of eating dishes without rice or wine according to corresponding to C-RLC protocol elements shared by unidirectional RB, a C-RLC protocol elements are corresponding The D-RLC protocol elements for being used for data and sending of identical quantity, wherein, each D-RLC protocol elements pair sent for data Answer a link of eating dishes without rice or wine；
    The quantity of link of eating dishes without rice or wine shared by the two-way RB according to corresponding to C-RLC protocol elements, a C-RLC protocol elements are corresponding The D-RLC protocol elements for being used for data transmission of identical quantity and the D-RLC protocol elements for data receiver of identical quantity, Wherein, the D-RLC protocol elements for being used for data transmission and the D-RLC protocol elements for being used for data receiver are corresponding one Eat dishes without rice or wine link.
  3. 3. distributed base station system as claimed in claim 1, it is characterised in that the C-RLC protocol elements, for caching The data that the last layer protocol element of C-RLC protocol elements is sent are stated, and give the data distribution of caching to the C-RLC agreements list The D-RLC protocol elements sent corresponding to first for data；And/or
    For receiving the data sent corresponding to the C-RLC protocol elements for the D-RLC protocol elements of data receiver, and will Received data are sent to the last layer protocol element of the C-RLC protocol elements after being recombinated.
  4. 4. distributed base station system as claimed in claim 3, it is characterised in that the C-RLC protocol elements, be specifically used for：
    After the data that the last layer protocol element for receiving the C-RLC protocol elements is sent, assisted to media access control MAC Discuss unit and send data distribution request；
    Receive the data distribution instruction of the MAC protocol unit feedback；
    Indicated according to the data distribution, the data distribution of caching is sent out to corresponding to the C-RLC protocol elements for data The D-RLC protocol elements sent.
  5. 5. distributed base station system as claimed in claim 3, it is characterised in that the D-RLC agreements sent for data Unit, for by the data transfer that the C-RLC protocol elements received are distributed to MAC protocol unit；
    The D-RLC protocol elements for data receiver, for the data transfer that the MAC protocol unit that will receive is sent to C-RLC protocol elements corresponding to the D-RLC protocol elements for data receiver.
  6. 6. the distributed base station system as any one of claim 1 to 5, it is characterised in that also include in the DU：Road By unit, the corresponding D-RLC protocol elements sent with being used for data in the DU of the routing unit.
  7. 7. distributed base station system as claimed in claim 6, it is characterised in that the routing unit, for receiving MAC associations After discussing the data that unit is sent, received data are sent to the D-RLC protocol elements for being used for data in the DU and sending, Or received data are sent to the D-RLC protocol elements for being used for data receiver in the CU being connected with the DU.
  8. 8. distributed base station system as claimed in claim 1, it is characterised in that the C-RLC protocol elements are used for：According to The configuration information of RRC protocol elements, it is configured to the D-RLC protocol elements of data transmission；And/or
    Indicated according to the data distribution of MAC protocol unit, activate or deactivate and be used for data corresponding to the C-RLC functional entitys The D-RLC protocol elements of transmission.
  9. 9. a kind of CU, it is characterised in that the CU includes C-RLC protocol elements, and the D-RLC agreements for data receiver Unit；The DU that the CU includes the D-RLC protocol elements sent for data with M is connected, and M is positive integer.
  10. 10. CU as claimed in claim 9, it is characterised in that corresponding one unidirectional or double-direction radio of a C-RLC protocol elements Carry RB；
    The quantity of link of eating dishes without rice or wine according to corresponding to C-RLC protocol elements shared by unidirectional RB, a C-RLC protocol elements are corresponding The D-RLC protocol elements for being used for data and sending of identical quantity, wherein, each D-RLC protocol elements pair sent for data Answer a link of eating dishes without rice or wine；
    The quantity of link of eating dishes without rice or wine shared by the two-way RB according to corresponding to C-RLC protocol elements, a C-RLC protocol elements are corresponding The D-RLC protocol elements for being used for data transmission of identical quantity and the D-RLC protocol elements for data receiver of identical quantity, Wherein, the D-RLC protocol elements for being used for data transmission and the D-RLC protocol elements for being used for data receiver are corresponding one Eat dishes without rice or wine link.
  11. 11. CU as claimed in claim 9, it is characterised in that the C-RLC protocol elements, for caching the C-RLC agreements The data that the last layer protocol element of unit is sent, and the data distribution of caching is used to corresponding to the C-RLC protocol elements In the D-RLC protocol elements that data are sent；And/or
    For receiving the data sent corresponding to the C-RLC protocol elements for the D-RLC protocol elements of data receiver, and will Received data are sent to the last layer protocol element of the C-RLC protocol elements after being recombinated.
  12. 12. CU as claimed in claim 11, it is characterised in that the C-RLC protocol elements, be specifically used for：
    After the data that the last layer protocol element for receiving the C-RLC protocol elements is sent, assisted to media access control MAC Discuss unit and send data distribution request；
    Receive the data distribution instruction of the MAC protocol unit feedback；
    Indicated according to the data distribution, the data distribution of caching is sent out to corresponding to the C-RLC protocol elements for data The D-RLC protocol elements sent.
  13. 13. CU as claimed in claim 9, it is characterised in that the C-RLC protocol elements are used for：According to RRC protocol elements Configuration information, it is configured to the D-RLC protocol elements of data transmission；And/or
    Indicated according to the data distribution of MAC protocol unit, activate or deactivate and be used for data corresponding to the C-RLC functional entitys The D-RLC protocol elements of transmission.
  14. 14. a kind of DU, it is characterised in that the DU includes being used for the D-RLC protocol elements that data are sent；The DU is connected to Include the CU of C-RLC protocol elements and the D-RLC protocol elements for data receiver.
  15. 15. DU as claimed in claim 14, it is characterised in that the D-RLC protocol elements sent for data, for inciting somebody to action The data transfer of C-RLC protocol elements distribution in the CU received is to MAC protocol unit.
  16. 16. the DU as described in claims 14 or 15, it is characterised in that also include：Routing unit, the routing unit it is corresponding with It is used for the D-RLC protocol elements that data are sent in the DU.
  17. 17. DU as claimed in claim 16, it is characterised in that the routing unit, for receiving the transmission of MAC protocol unit Data after, received data are sent to the D-RLC protocol elements for being used for data in the DU and sending, or will be received To data be sent in the CU being connected with the DU be used for data receiver D-RLC protocol elements.
  18. A kind of 18. data transmission method, it is characterised in that application and distributed base station system, in the distributed base station system M DU being connected including CU and with the CU, M is positive integer；
    This method includes：
    The data that C-RLC protocol elements in the CU are sent to the last layer protocol element of the C-RLC protocol elements are carried out Caching；
    C-RLC protocol elements in the CU, which give the data distribution of caching, is connected in the DU of the CU and C-RLC The D-RLC protocol elements sent corresponding to protocol element for data；
    The number for being used for the D-RLC protocol elements that data are sent and distributing the C-RLC protocol elements received in the DU According to being transferred to MAC protocol unit.
  19. A kind of 19. data transmission method, it is characterised in that application and distributed base station system, in the distributed base station system M DU being connected including CU and with the CU, M is positive integer；
    This method includes：
    The D-RLC protocol elements for data receiver in the CU receive the data that MAC protocol unit is sent；
    D-RLC protocol elements for data receiver in the CU by it is in received data transfer to the CU, with C-RLC protocol elements corresponding to the D-RLC protocol elements for data receiver；
    The C-RLC protocol elements assist the D-RLC for being used for data receiver corresponding to the received C-RLC protocol elements The data of view unit transmission are sent to the last layer protocol element of the C-RLC protocol elements after being recombinated.
  20. 20. data transmission method as claimed in claim 19, it is characterised in that the data that the MAC protocol unit is sent are The routing unit being connected in the DU of the CU is after the data of MAC protocol unit transmission are received and determines by received by The data transfer that MAC protocol unit is sent is used for the D-RLC agreement lists of data receiver into the CU being connected with the DU After member, what the D-RLC protocol elements for data receiver into the CU were transmitted.
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