KR20160124523A - Apparatus and Method for Providing Data Service in Small Cell Base Station - Google Patents
Apparatus and Method for Providing Data Service in Small Cell Base Station Download PDFInfo
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- KR20160124523A KR20160124523A KR1020150055263A KR20150055263A KR20160124523A KR 20160124523 A KR20160124523 A KR 20160124523A KR 1020150055263 A KR1020150055263 A KR 1020150055263A KR 20150055263 A KR20150055263 A KR 20150055263A KR 20160124523 A KR20160124523 A KR 20160124523A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
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Abstract
Description
The present invention relates to a method and apparatus for providing a data service in a small cell base station, and more particularly, to a method and apparatus for providing data service in a small cell base station based on a FAP (Femto Application Platform Interface) defined in a Small Cell Forum To a method and apparatus for providing downlink and uplink data services to a terminal.
Small Cell Forum standardizes the FAPI (Femto Application Platform Interface), which is a common application platform interface, to facilitate compatibility between different hardware platform developers, software platform developers, and application software developers in developing small cell base stations or femto base stations . In particular, the document "SCF082.04.01 LTE eNB L1 API definition" document defines the interface between L1 hardware and L2 / L3 software of LTE small cell base station and suggests a method to provide data service in small cell base station.
However, the L1 API (Application Programming Interface) and the Scheduler API defined in the Small Cell Forum are all communicated through the Medium Access Control (MAC) processor. This method has the advantage of unifying the subject of communication to the MAC and the advantage of simplifying the scheduler by only communicating with the scheduler when necessary. However, since all the message communication is performed through the MAC, The MAC processing unit receives the delay and downlink scheduling information generated by the MAC processing unit and transmits the delayed and downlink scheduling information to the RLC processing unit, Thereby increasing the complexity of the MAC and the like, the MAC processing unit must process the user data traffic of many mobile stations.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a subframe function for dividing a function of a subframe block dedicated to communication with a PHY in a MAC, The subframe function for the user plane simplifies the overall message procedure by using a structure performed in the subframe block of the MAC and transmits the scheduling information of the downlink to the RLC in the scheduler, Which can improve performance by efficiently processing user data of many UEs by reducing the complexity of the MAC to simplify the message procedure between the UE and the MAC subframe block, A method and apparatus for providing downlink and uplink data services to a terminal are provided have.
The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.
According to another aspect of the present invention, there is provided a data service method in a small cell base station, comprising: (a) receiving a downlink data from an RLC processor in a MAC processor, (Packet Data Unit) to the PHY processing unit; And (b) transmitting, by the MAC processing unit, the PDU generated by receiving the uplink data from the PHY processing unit to the RLC processing unit, and transmitting the PDU to the user plane And the function of the control plane for the data processing is processed by the scheduler included in the MAC processing unit to separate the function of the user plane and the function of the control plane separately In a block.
wherein the step (a) comprises: receiving, at the scheduler, control information for scheduling from the PHY processing unit, and receiving the RLC processor rotor downlink scheduling request; Transmitting, in the scheduler, downlink scheduling information to the RLC processor and the PHY processor, and transmitting a subframe control message for uplink reception to the PHY processor; And transmitting, in the RLC processor, a PDU generated according to the downlink scheduling information and the downlink scheduling information to a subframe block of the MAC processor.
(b) comprises: requesting uplink scheduling to the scheduler in a subframe block of the MAC processor; Transmitting, in the scheduler, uplink scheduling information to the PHY processor and requesting uplink data processing to a subframe block of the MAC processor; And processing the uplink data received from the PHY processing unit in a subframe block of the MAC processing unit, transmitting MAC CE (Control Element) information to the scheduler, and transmitting a PDU for the uplink data to the RLC processing unit .
The control information for scheduling includes RACH information, Hybrid Automatic Retransmission request (HARQ) information for downlink data, Channel Quality Indicator (CQI) information, cyclic redundancy check (CRC) information for uplink data , Scheduling Request (SR) information, or SRS (Sounding Reference Signaling) information.
According to another aspect of the present invention, there is provided a data service apparatus provided in a small cell base station, the PDU comprising: a PDU (Packet Data Unit) generated by receiving downlink data from an RLC processing unit to a PHY processing unit; And a MAC processor for transmitting the PDU generated by receiving the data to the RLC processor. The MAC processor includes a subframe block for performing a user plane function for data processing transmitted to or received from the user terminal, ; And a scheduler including a control plane subframe function for performing a function of a control plane for data processing, wherein the function of the user plane and the function of the control plane are separated from each other, And processes it in a scheduler.
According to the method and apparatus for providing data service in a small cell base station according to the present invention, in providing a data service in a small cell base station, among the APIs for interworking with the PHY processing unit, messages for transmitting / The control plane and the user plane functions are transmitted to the scheduler and the receiver by using the structure of transmitting and receiving and processing the messages and transmitting and receiving the user data by directly transmitting and receiving the messages in the subframe block of the MAC processor. The RLC processing unit performs the downlink scheduling request in the MAC subframe block and the scheduling result of the scheduler is directly received and processed in the RLC processing unit to simplify the interface between the MAC and the RLC, A function that transmits and receives user data by processing It can be simplified mostly, and there is an effect that by efficient processing of the user data of the number of terminals can improve the transmission performance of the base station.
1 is a diagram for explaining a relation between an L1 layer API and an L2 / L3 layer in a general small cell base station.
2 shows a structure and an interface of a MAC protocol for providing data service in a general small cell base station.
3 shows a procedure for providing a data service through the L1 API and the Scheduler API defined in the Small Cell Forum in a typical small cell base station.
4 is a diagram for explaining a data service apparatus of a small cell base station according to an embodiment of the present invention.
5 is a flowchart illustrating a service providing procedure in a data service apparatus of a small cell base station according to an embodiment of the present invention.
6 is a diagram for explaining an example of a method for implementing a data service apparatus of a small cell base station according to an embodiment of the present invention.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.
In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.
1 is a diagram for explaining a relation between an L1 layer API and an L2 / L3 layer in a general small cell base station. FIG. 1 briefly shows the matching relationship between the L1 API (Application Programming Interface) defined in SCF082.04.01 and the L2 / L3 protocol.
In FIG. 1, the L1 PHY (Physical) layer hardware and the L2 / L3 layer software communicate through the P5 interface and the P7 interface. The P5 interface is an interface for the PHY control entity to perform the setup procedure of the PHY, and may be performed by Self-Optimization Netork (SON) application software or HeMS (Home eNB Management System) application software. The P7 interface is an interface for providing data service to the mobile terminal and is performed by the MAC (Medium Access Control) protocol. In addition, a carrier aggregation technique provided by 3GPP Rel-10 is provided. When there are multiple PHY layer hardware, each PHY is interfaced through a separate L1 API. In addition, to provide data services, the L2 / L3 layer software supports signal processing according to protocols such as Radio Resource Control (RRC), Packet Data Convergence Protocol (PDCP), and Radio Link Control (RLC).
2 shows a structure and an interface of a MAC protocol for providing data service in a general small cell base station.
As shown in FIG. 2, the MAC protocol processing unit includes a Scheduler, a Control Block, and a Subframe Block. The scheduler is divided into a downlink (DL) scheduler and an uplink (UL) scheduler. The remaining functions (PDCCH / RACH, Cell Cfg, UE Cfg, LC Cfg, HARQ, Sched Cfg, Shared by the link / uplink scheduler. The control block is used for setting and controlling the cell and the mobile terminal from the Radio Resource Control (RRC) / Radio Resource Management (RRM) / Operations, Administration and Maintenance (OAM) protocol through the Control MAC (Service Access Point) And controls the scheduler through the CSCHED SAP (Control SCHEDuler SAP). The subframe block communicates with the PHY through the PHY SAP, communicates with the RLC through the MAC SAP, and provides the data service by requesting the scheduler to schedule through the SCHED SAP.
3 shows a procedure for providing a data service through the L1 API and the Scheduler API defined in the Small Cell Forum in a typical small cell base station. In FIG. 3, the order and subframe information of the L1 API messages between the PHY processing unit and the MAC processing unit may differ from one PHY processing unit manufacturer to another, and one example thereof will be described with reference to FIG.
The RLC processor transmits information on an RLC PDU (Packet Data Unit) accumulated in a buffer of logical channels (LC channels) of mobile stations to the scheduler through the SCHED_DL_RLC_BUFFER_REQ message for downlink data service (0). The message is not per subframe and may vary depending on the L2 / L3 software design.
The PHY processing unit transmits a SUBFRAME.indication message including a current system frame number (SFN) and a subframe number (SF) to a subframe block of the MAC processing unit at the start of a 1 msec subframe to inform the start of the subframe (1).
In addition, the PHY processing unit includes RACH (Random Access Channel) indication information received from mobile stations, Hybrid Automatic Retransmission request (HARQ) indication information for downlink data, CQI (Channel Quality Indicator) indication information, CRC (Cyclic Redundancy Check) indication information, SR (Scheduling Request) indication information, and SRS (Sounding Reference Signaling) indication information to the MAC processing unit (2). Such messages include subframe number (SFN, SF) information that has received the information, and only when the corresponding information is received, the message is transmitted to the subframe block of the MAC processing unit.
Then, the PHY processing unit delivers the RX_ULSCH.indication message including the subframe number (SFN, SF) information, which is the data received and decoded from the uplink data from the mobile stations, and the received data to the subframe block of the MAC processing unit 3).
The sub-frame block of the MAC processing unit transmits paging buffer information to the scheduler through the SCHED_DL_PAGING_BUFFER_REQ message to request scheduling for the paging message received from the RRC unit (4). The message includes the paging size and the subframe number (SFN, SF) information to be transmitted, and requests scheduling in units of 10 ms when there is a paging message to be transmitted.
The subframe block of the MAC processing unit receives the downlink related MAC CE (Control Element) information acquired through the uplink data reception, that is, MAC CE (Timing Advance), DRX (Discontinuous Reception) (5), and transmits the RACH information and the CQI information received from the PHY processing unit to the scheduler through the SCHED_DL_RACH_INFO_REQ message and the SCHED_DL_CQI_INFO_REQ message (6, 7). The SCHED_DL_MAC_BUFFER_REQ message is transmitted to the scheduler. Then, a SCHED_DL_TRIGGER_REQ message including the HARQ information received from the PHY processing unit is transmitted to the scheduler to request downlink scheduling (8).
The downlink scheduler of the scheduler performs downlink resource allocation for the mobile terminal based on the paging buffer information, the LC buffer information, the MAC CE information, the RACH information, the CQI information, and the HARQ information, (9) the SCH scheduling downlink resource information (downlink scheduling information) to the sub-frame block of the MAC processor through the SCHED_DL_CONFIG_IND message.
The sub-frame block of the MAC processing unit receives the scheduled downlink resource information (downlink scheduling information), transmits DCI (Downlink Control Information) to be transmitted in the current subframe to the PHY processor through DL_CONFIG.request (10) A transport block is created according to the scheduled resource information and the transport block is requested to be transmitted to the sub-frame block of the MAC processing unit (11).
When the processing for the downlink scheduling request is completed, the subframe block of the MAC processing unit transmits a UL_CONFIG.request message for controlling the uplink subframe of the PHY processing unit to the PHY processing unit (12). The UL_CONFIG.request includes a PUSCH (Physical Uplink Shared CHannel) and a PUCCH (Physical Uplink Control Channel) information to be received at the present subframe in the PHY processing unit. The PHY processing unit receives the message according to the information included in the corresponding message, Lt; / RTI >
The subframe block of the MAC processor starts a procedure for requesting uplink scheduling. The sub-frame block of the MAC processing unit transmits the SR information and the CQI information received from the PHY processing unit to the scheduler through the SCHED_UL_SR_INFO_REQ message and the SCHED_UL_CQI_INFO_REQ message (13, 14). Then, the uplink MAC CE information acquired through the uplink data reception, that is, the MAC CE such as BSR (Buffer Status Report) and PHR (Power Headroom Report) is transmitted to the Scheduler through the SCHED_UL_MAC_CTRL_INFO_REQ message (15) And transmits a SCHED_UL_TRIGGER_REQ message to the scheduler based on the CRC information and the uplink data reception information received from the scheduler (16). The message includes a CRC reception error of uplink data, an actual reception size of uplink data, and the like.
The uplink scheduler of the scheduler performs uplink resource allocation to the mobile station based on the already received SR information, CQI information, MAC CE information, CRC information, actual received data size information, (UL scheduling information) to the sub-frame block of the MAC processor through the SCHED_UL_CONFIG_IND message (17).
After receiving the UL resource information (UL scheduling information) scheduled from the scheduler, the sub-frame block of the MAC processor receives (18) the UL transmission block from the RLC processor, After generating the MAC PDU to be actually transmitted based on the MAC CE information, control is performed to transmit the TX.Request to the PHY processor to transmit the downlink data (19). Then, the HI_DCI0.request message including the uplink DCI information and the uplink HARQ information received from the uplink scheduler is transmitted to the PHY processor (20). Then, the uplink data received from the PHY processor is transmitted to the RLC processor (21).
As described above, the L1 API and the Scheduler API defined in the Small Cell Forum are all communicated through the subframe block of the MAC processing unit. This method has the advantage of unifying the subject of communication to MAC and the advantage of simplifying the scheduler by only communicating with the scheduler when necessary. However, since all message communication is performed through the subframe block of the MAC processor A delay occurring due to the subframe block of the MAC processing unit receiving the delay and downlink scheduling information generated by processing the message received from the PHY processing unit in the subframe block of the MAC processing unit and transmitting the processed delayed and downlink scheduling information to the scheduler, , The subframe block of the MAC processor performs the subframe control for the uplink reception, thereby increasing the complexity of the MAC, and the user data traffic of many mobile stations must be processed in the subframe block of the MAC processor. .
4 is a diagram for explaining a
Referring to FIG. 4, a
4, the
Particularly, in the
As shown in FIG. 4, since the L1 API provided by the Small Cell Forum is not a standard specification but a recommended standard, it can not be regarded as a manufacturer precisely and can provide messages and parameters specific to the manufacturer The
4, the function of the subframe block of the
Accordingly, the
The
5 is a flowchart illustrating a service providing procedure in a
In order to provide a downlink data service, the
The
The
In addition, the
In this way, the
The
The
When receiving the downlink scheduling request from the
When the downlink scheduling is completed, the
The
In order to provide the uplink data service, the
The
6 is a view for explaining an example of a method of implementing a
The
Thus, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by
As described above, in the
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. For example, the user terminal referred to in the present invention may be a mobile terminal such as a smart phone, a notebook PC, and a tablet PC, and may be a personal digital assistant (PDA), a portable multimedia player (PMP) Or may include electronic devices that may be capable of supporting mobile communications (e.g., CDMA, WCDMA, LTE, etc.) or Internet communications (e.g., WiBro, WiFi, etc.).
Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
A PHY Convergence Layer (PHY Convergence Layer)
The
An RLC (Radio Link Control)
The
The
The
The control plane sub-frame function (213)
Claims (8)
(a) transmitting a PDU (Packet Data Unit) generated by receiving downlink data from an RLC processing unit in a MAC processing unit to a PHY processing unit; And
(b) transmitting the PDU generated by receiving the uplink data from the PHY processing unit in the MAC processing unit to the RLC processing unit,
A function of a user plane for data processing transmitted to a user terminal or received from the user terminal is processed in a subframe block of the MAC processing unit and a function of a control plane for the data processing is processed in a scheduler included in the MAC processing unit Thereby separating and processing the function of the user plane and the function of the control plane.
(a)
Receiving, in the scheduler, control information for scheduling from the PHY processor and receiving a RLC processor rotor downlink scheduling request;
Transmitting, in the scheduler, downlink scheduling information to the RLC processor and the PHY processor, and transmitting a subframe control message for uplink reception to the PHY processor; And
Transmitting, by the RLC processor, a PDU generated according to the downlink scheduling information and the downlink scheduling information to a subframe block of the MAC processor;
Wherein the data service method comprises:
(b)
Requesting uplink scheduling to the scheduler in a subframe block of the MAC processor;
Transmitting, in the scheduler, uplink scheduling information to the PHY processor and requesting uplink data processing to a subframe block of the MAC processor; And
Processing the uplink data received from the PHY processing unit in the sub-frame block of the MAC processing unit, transmitting MAC CE (Control Element) information to the scheduler, and transmitting a PDU for the uplink data to the RLC processing unit
Wherein the data service method comprises:
The control information for scheduling includes RACH information, Hybrid Automatic Retransmission request (HARQ) information for downlink data, Channel Quality Indicator (CQI) information, cyclic redundancy check (CRC) information for uplink data , Scheduling Request (SR) information, or SRS (Sounding Reference Signaling) information.
And a MAC processing unit for transmitting a PDU (Packet Data Unit) generated by receiving downlink data from the RLC processing unit to the PHY processing unit, receiving the uplink data from the PHY processing unit, and transmitting the generated PDU to the RLC processing unit,
Wherein the MAC processing unit comprises: a subframe block that performs a function of a user plane for data processing transmitted to or received from a user terminal; And a scheduler including a control plane subframe function performing the function of a control plane for the data processing,
And separates and processes the function of the user plane and the function of the control plane.
A scheduler for receiving control information for scheduling from the PHY processor, a RLC processor for receiving a downlink scheduling request from the RLC processor,
The scheduler transmits downlink scheduling information to the RLC processor and the PHY processor, transmits a subframe control message for uplink reception to the PHY processor,
Wherein the RLC processor transmits a PDU generated according to the downlink scheduling information and the downlink scheduling information to a subframe block of the MAC processor.
For uplink data service, in the sub-frame block of the MAC processor, uplink scheduling is requested to the scheduler,
Wherein the scheduler transmits uplink scheduling information to the PHY processor and requests uplink data processing to a subframe block of the MAC processor,
In the sub-frame block of the MAC processing unit, the uplink data received from the PHY processing unit is processed to transmit MAC CE (Control Element) information to the scheduler and the PDU for the uplink data is transmitted to the RLC processor Wherein the data service device comprises:
The control information for scheduling includes RACH information, Hybrid Automatic Retransmission request (HARQ) information for downlink data, Channel Quality Indicator (CQI) information, cyclic redundancy check (CRC) information for uplink data , Scheduling Request (SR) information, or SRS (Sounding Reference Signaling) information.
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