KR20140122050A - Border guard/reconnaissance communication terminal for providing variable frame structure and method for altering the frame structure - Google Patents

Abstract

Disclosed are a border monitoring/reconnoitering communication terminal to support a variable frame structure and a method for varying a frame structure. The border monitoring/reconnoitering communication terminal comprises: a synchronizing unit to detect a frame starting point of a downward link signal to provide DLStartINT, a starting address of a buffer, an IDCell, and a SegmentID; an OFDM symbol unit processing unit to receive, in real time, the number of processing OFDM symbols of the downward link signal to be updated with reference to the provided DLStartINT, starting address of a buffer, IDCell, and SegmentID and to process the OFDM symbols of the downward link signal according to the updated number of processing the OFDM symbols; a slot unit processing unit to deallocate FCH; and an FEC block unit processing unit to decode the FCH, to identify a size of a map, a used subchannel bitmap, and a channel coding type, to deallocate the map after FFT processing the symbols included in the map according to the size of the map, to identify No. IFDMA symbol parameters by decoding the map to parse DLMAP, if there is no CRC error in an MPDU, and determine a upward/downward link ratio to be fed back to the OFDM symbol unit processing unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a border monitoring / reconfiguring communication terminal supporting a variable frame structure and a variable frame structure thereof.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a border monitoring / reconnaissance communication terminal, and more particularly, to a border monitoring / reconfiguring communication terminal supporting a variable frame structure and a frame structure variable method thereof.

Conventionally, a communication terminal for border surveillance / reconnaissance transmits a large amount of acquired image data in real time, and a WiPHY based near-field mobile system system is mainstream. Recently, a WiMAX-based communication system for broadband wireless access has appeared, but it is not suitable for real-time transmission of a large amount of image information acquired from a communication terminal.

A communication terminal for border surveillance / reconnaissance has various requirements for its purpose. First, a base station must be able to perform a wide range of surveillance and reconnaissance functions by using a plurality of surveillance vehicles.

Since a plurality of terminals need to be operated simultaneously, a large amount of image information must be collected by the base station. Accordingly, there arises a case where a single monitoring apparatus needs to acquire a high-quality image for precise monitoring of a suspicious area, with an increase in the amount of uplink data required. Therefore, it is necessary to be flexible in coping with the increase of uplink traffic of a specific terminal.

Next, an image acquired from the surveillance vehicle needs to be transmitted to the surrounding surveillance vehicle. In order to do this, it is necessary to be able to cope with instantaneous downlink data concentration.

In addition, a communication system for border surveillance and reconnaissance is required to be capable of adjusting and scheduling dynamic uplink / downlink ratios in real time. Therefore, the physical layer of the base station and the terminal must be optimally designed so as to flexibly process data that is instantaneously concentrated.

According to this requirement, a communication terminal for border surveillance and reconnaissance needs an efficient transmission process through frame variable such as changing the number of OFDMA symbols in uplink and downlink.

An object of the present invention is to provide a communication terminal for border monitoring / reconnaissance that supports a variable frame structure.

Another object of the present invention is to provide a frame structure variable method for a border monitoring / reconnaissance communication terminal.

A communication terminal for border monitoring / reconnaissance supporting a variable frame structure according to an exemplary embodiment of the present invention includes: a synchronization unit for detecting a frame start point of a downlink signal and providing DLStartINT, a buffer start address, an IDCell, and a SegmentID; The DLStartINT, the start address of the buffer, the IDCell, and the SegmentID of the downlink signal, updates the received number of OFDM symbols of the downlink signal in real time, processes the OFDM symbol of the downlink signal according to the number of processed OFDM symbols, An OFDM symbol unit processor; A slot-based processing unit for performing deallocation of the FCH; The FCH is decoded and the size of the MAP, the used subchannel BitMAP, and the channel coding type are checked, and after the FFT processing of the symbols included in the map according to the size of the map, Performs mapping, decodes the map, and parses the DLMAP when there is no CRC error of the MPDU. And an FEC block unit processing unit for determining an uplink / downlink ratio by checking OFDMA symbol parameters and feeding back the determined uplink / downlink ratio to the OFDM symbol unit processor.

At this time, the OFDM symbol unit processing unit may be configured to initially process three OFDM symbols.

The FEC block unit may be configured to perform FFT processing by maintaining a previous uplink / downlink ratio when an error occurs.

Here, the OFDM symbol unit processing unit may be configured to process the idle OFDM symbols included in the downlink signal according to a distance between the communication terminal for border monitoring / reconnaissance and the base station for coverage extension operation.

According to another aspect of the present invention, there is provided a method for variable frame structure of a border monitoring / reconnaissance communication terminal, comprising the steps of: detecting a frame start point of a downlink signal and providing DLStartINT, a start address of the buffer, an IDCell, and a SegmentID; The OFDM symbol unit processing unit refers to the DLStartINT, the start address of the buffer, the IDCell, and the SegmentID provided from the synchronization unit; Receiving, by the OFDM symbol unit processor, the number of OFDM symbols of the downlink signal in real time from the FEC block unit processor; Processing the OFDM symbol of the downlink signal according to the number of OFDM symbols processed by the OFDM symbol unit processing unit; Performing a deallocation of the slot-based processing unit on the FCH; The FEC block unit processing unit decodes the FCH and confirms a size of a MAP, a used subchannel bitmap, and a channel coding type; Performing an FQ processing on a symbol included in the map according to the size of the FEC block unit processing unit; If the FEC block unit processing unit decodes the map and there is no CRC error of the MPDU, Determining an uplink / downlink ratio by checking an OFDMA symbol parameter, and feeding back the determined uplink / downlink ratio to the OFDM symbol unit processor.

In this case, the step of processing the OFDM symbol of the downlink signal according to the number of processed OFDM symbols may be configured to process three OFDM symbols at an initial stage.

The FEC block unit processor performs FFT processing on the symbols included in the map according to the size of the map, and performs FFT processing on the map by maintaining previous uplink / downlink ratios when an error occurs Lt; / RTI >

The step of processing the OFDM symbol of the downlink signal according to the number of OFDM symbols processed by the OFDM symbol unit processing unit may include a step of performing downlink processing according to the distance between the communication terminal for border monitoring / And to process the idle OFDM symbols included in the link signal.

According to the communication terminal for border surveillance / reconnaissance and the frame structure variable method for supporting the variable frame structure as described above, it is possible to flexibly process the video data of the communication terminal in a concentrated manner by adjusting and scheduling the uplink / .

1 is a block diagram of a border monitoring / reconnaissance communication terminal supporting a variable frame structure according to an embodiment of the present invention.
2 is a terminal state transition diagram of a border monitoring / reconnaissance communication terminal according to an embodiment of the present invention.
3 is a flowchart of a frame structure variable method of a border monitoring / reconnaissance communication terminal according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, 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 are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a border monitoring / reconnaissance communication terminal supporting a variable frame structure according to an embodiment of the present invention.

1, a communication terminal 100 (hereinafter, referred to as a "communication terminal") for supporting a variable frame structure according to an embodiment of the present invention includes a synchronization unit 110, an OFDM symbol Unit processor 120, a slot-unit processor 130, and an FEC-block-unit processor 140.

The communication terminal 100 can be configured to flexibly utilize the variable frame structure to schedule data so that data can be transmitted without delay when the image data is concentrated. Hereinafter, the detailed configuration will be described.

The synchronization unit 110 may be configured to detect a frame start point of the downlink signal and provide DLStartINT, a start address of the buffer, an IDCell, and a SegmentID.

The OFDM symbol unit processing unit 120 is configured to refer to the DLStartINT provided by the synchronization unit 110, the start address of the buffer, the IDCell, and the SegmentID. And process the OFDM symbol of the downlink signal according to the number of processed OFDM symbols.

The slot-based processing unit 130 may be configured to perform deallocation for the FCH.

The FEC block unit processing unit 140 is configured to decode the FCH and check the size of the MAP, the used subchannel BitMAP, and the channel coding type.

The FEC block unit processing unit 140 performs a mapping on a map after FFT processing for symbols included in the map according to the size of the map. Then, if there is no CRC error of the MPDU, the DLMAP is parsed to decode the MAP. The OFDMA symbol parameters are checked to determine the uplink / downlink ratio. And is also configured to feed back to the OFDM symbol unit processing unit 120. [

At this time, it is preferable that the OFDM symbol unit processing unit 120 processes three OFDM symbols at an initial stage before receiving the feedback.

The OFDM symbol unit processing unit 120 is configured to process a predetermined number of idle OFDM symbols included in the downlink signal according to the distance between the communication terminal 100 and the base station for border coverage / .

The FEC block unit 140 may perform FFT processing by maintaining the previous uplink / downlink ratio when an error occurs.

2 is a terminal state transition diagram of a border monitoring / reconnaissance communication terminal according to an embodiment of the present invention.

Referring to FIG. 2, when DLStartINT occurs, a PRBS and a Renumbering Sequence for the first Zone are generated using the IDCell and the SegmentID to process the FCH. The PRBS value is needed in the DeScrambling process, and the Renumbering Sequence is needed for the SubChannel DeAllocation process to find the FCH SubChannel position.

 When preparation for the FCH is completed, the FFT calculation for the three OFDM symbols is completed using the symbol counter value. DeAllocEndINT is generated after the processing for FCH is completed, so that the FEC Block unit processing unit is operated.

 Upon receiving FCHEndINT, a Renumbering Sequence for the first Zone is generated by using the Used SubChannel BitMAP of the first zone identified through the FCH value. This is for finding the number and location of the subchannels used in the first zone.

After confirming that the FFT operation is completed up to the OFDM symbol including the MAP by checking the MAP size, DeAllocation, channel estimation, and MIMO decoding are performed for the MAP. When DeAllocEndINT is generated after completion, the FEC Block processing unit operation is performed for the MAP.

 Upon completion of the FEC decoding, upon receipt of the ParserINT, parameters necessary for physical layer downlink decoding are extracted through parsing of the MAP data. The symbol rate is determined by checking the number of symbols in the downlink. The base station interworks with the change of the maximum communication distance of the terminal and the efficient scheduling of resources by using this parameter. In the monitoring boundary system for the purpose of operating only the near terminal through the scheduling, data is allocated and operated by using all the number of uplink and downlink symbols. When the terminal for remote reconnaissance is included, the last symbol of the downlink To a structure that does not allocate data and pilot to the TTG, and to enable wide coverage operation through the expansion effect of the TTG section.

 When the ParserEndINT is received, the values of the DLParmeter memory are validated, and a PRBS and a renumbering sequence for all the remaining zones are generated. Check the number and position information of the burst and sequentially process the slot unit until the last burst. DeAllocEndINT is generated every time the Burst process is completed.

In the FEC block unit processing unit, the channel decoding process for the burst is performed continuously by counting DeAllocEndINT.

3 is a flowchart of a frame structure variable method of a border monitoring / reconnaissance communication terminal according to an embodiment of the present invention.

Referring to FIG. 3, the synchronization unit 110 detects a frame start point of a downlink signal and provides a DLStartINT, a start address of a buffer, an IDCell, and a SegmentID (S101).

Next, the OFDM symbol unit processing unit 120 refers to the DLStartINT provided from the synchronization unit 110, the start address of the buffer, the IDCell, and the SegmentID (S102).

Next, the OFDM symbol unit processing unit 120 feedbacks the number of OFDM symbols processed in the downlink signal from the FEC block unit processing unit 140 in real time (S103).

Next, the OFDM symbol unit processing unit 120 processes the OFDM symbol of the downlink signal according to the number of processed OFDM symbols (S104). At this time, it is preferable to initially process three OFDM symbols.

The OFDM symbol unit processing unit 120 may be configured to process the idle OFDM symbols included in the coverage extension operation. A predetermined number of idle OFDM symbols may be included in the downlink signal according to the distance between the communication terminal 100 for border surveillance / reconnaissance and the base station.

Next, the slot-based processing unit 130 performs deallocation of the FCH (S105).

Next, the FEC block unit processing unit 140 decodes the FCH and confirms the size of the MAP, the used SubChannel BitMAP, and the channel coding type (S106).

Next, the FEC block unit processing unit 140 performs a dialing on the map after the FFT processing for the symbols included in the map according to the size of the map (S107). At this time, it is preferable to perform the FFT processing by maintaining the previous uplink / downlink ratio when an error occurs.

Next, if the FEC block unit processing unit 140 decodes the map and there is no CRC error of the MPDU, Determines the uplink / downlink ratio by checking the OFDMA symbol parameters, and feeds back to the OFDM symbol unit processing unit 120 (S108).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims There will be.

110: Synchronization
120: OFDM symbol unit processor
130: slot unit processor
140: FEC block unit processor

Claims (8)

A synchronization unit for detecting a frame start point of the downlink signal and providing DLStartINT, a start address of the buffer, an IDCell, and a SegmentID;
The DLStartINT, the start address of the buffer, the IDCell, and the SegmentID of the downlink signal, updates the received number of OFDM symbols of the downlink signal in real time, processes the OFDM symbol of the downlink signal according to the number of processed OFDM symbols, An OFDM symbol unit processor;
A slot-based processing unit for performing deallocation of the FCH;
The FCH is decoded and the size of the MAP, the used subchannel bitmap, and the channel coding type are checked, and after the FFT processing for the symbols included in the map according to the size of the map, Performs mapping, decodes the map, and parses the DLMAP when there is no CRC error of the MPDU. And a FEC block unit processor for determining an uplink / downlink ratio by checking an OFDMA symbol parameter and feeding back the determined uplink / downlink ratio to the OFDM symbol unit processor. The apparatus of claim 1, wherein the OFDM symbol unit processor comprises:
Wherein at least one OFDM symbol is initially processed in the OFDM symbol. The FEC block unit according to claim 2,
And the FFT processing is performed while maintaining the previous uplink / downlink ratio when an error occurs. The communication terminal for border monitoring / reconnaissance supporting a variable frame structure. The apparatus of claim 3, wherein the OFDM symbol unit processing unit comprises:
Wherein the idle OFDM symbol included in the downlink signal is processed according to a distance between the communication terminal for border monitoring / reconnaissance and the base station for coverage extension operation. The synchronization unit detects a frame start point of the downlink signal and provides DLStartINT, a start address of the buffer, an IDCell, and a SegmentID;
The OFDM symbol unit processing unit refers to the DLStartINT, the start address of the buffer, the IDCell, and the SegmentID provided from the synchronization unit;
Receiving, by the OFDM symbol unit processor, the number of OFDM symbols of the downlink signal in real time from the FEC block unit processor;
Processing the OFDM symbol of the downlink signal according to the number of OFDM symbols processed by the OFDM symbol unit processing unit;
Performing a deallocation of the slot-based processing unit on the FCH;
The FEC block unit processing unit decodes the FCH and confirms a size of a MAP, a used subchannel bitmap, and a channel coding type;
Performing an FQ processing on a symbol included in the map according to the size of the FEC block unit processing unit;
If the FEC block unit processing unit decodes the map and there is no CRC error of the MPDU, Determining an uplink / downlink ratio by checking the OFDMA symbol parameter, and feeding back to the OFDM symbol unit processor. 6. The method of claim 5, wherein the OFDM symbol unit processing unit processes the OFDM symbol of the downlink signal according to the number of processed OFDM symbols,
Wherein the three OFDM symbols are initially processed. ≪ RTI ID = 0.0 > [10] < / RTI > The method as claimed in claim 6, wherein the FEC block unit processing unit performs FQ processing on a symbol included in the map according to the size of the map,
Wherein the FFT processing is performed while maintaining the previous uplink / downlink ratio when an error occurs. 6. The method of claim 5, wherein the OFDM symbol unit processing unit processes the OFDM symbol of the downlink signal according to the number of processed OFDM symbols,
And processing the idle OFDM symbols included in the downlink signal according to a distance between the communication terminal for border monitoring / reconnaissance and the base station for coverage extension operation.

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