KR20160137839A - Narrow band frequency hopping device between machine type communication and base station - Google Patents

Narrow band frequency hopping device between machine type communication and base station Download PDF

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Publication number
KR20160137839A
KR20160137839A KR1020150071914A KR20150071914A KR20160137839A KR 20160137839 A KR20160137839 A KR 20160137839A KR 1020150071914 A KR1020150071914 A KR 1020150071914A KR 20150071914 A KR20150071914 A KR 20150071914A KR 20160137839 A KR20160137839 A KR 20160137839A
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South Korea
Prior art keywords
frequency hopping
communication terminal
base station
object communication
hopping
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KR1020150071914A
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Korean (ko)
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이충구
이용재
안준배
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(주)휴맥스
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7143—Arrangements for generation of hop patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/696—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to Dowlink

Abstract

The present invention can increase the reception performance of an Internet things terminal by using frequency hopping from a base station to an Internet of things terminal. The present invention relates to a narrow band frequency hopping device between an Internet of things terminal and a base station for repeatedly transmitting downlink signal of the base station through the frequency hopping device. The narrow band frequency hopping device between an Internet of things terminal and the base station of the present invention includes an Internet of things terminal for receiving the downlink signal by using frequency hopping in the base station.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a narrow band frequency hopping apparatus,

The present invention relates to an apparatus for narrowband frequency hopping between an object communication terminal and a base station, and more particularly, to enhance the reception performance of an object communication terminal by using frequency hopping from a base station to an object communication terminal. That is, the present invention relates to a narrowband frequency hopping apparatus between an object communication terminal and a base station capable of repeatedly transmitting a downlink signal of a base station through a frequency hopping apparatus.

In recent years, M2M (Machine-to-Machine) communication, which enables the acquisition and transmission of necessary information anytime and anywhere by connecting all the objects around the network, As a major issue.

On the other hand, in the 3rd Generation Partnership Project (3GPP) which is a mobile communication standardization organization, a standardization work is underway under the name of MTC (Machine Type Communications).

3GPP refers to an entity that does not require the direct manipulation or intervention of a 'machine', and MTC defines it as a form of data communication involving one or more of these 'machines'. That is, the MTC can be defined in the form of data communications associated with one or more entities that do not necessarily require human intervention.

Meanwhile, research on frequency hopping has been continued to improve the transmission efficiency between the object communication terminal and the base station.

For example, Korean Unexamined Patent Publication No. 2002-0042784 has studied a method of increasing the data transmission rate of an object communication apparatus by using frequency hopping.

In this case, there is a disadvantage in that it can not adapt to the state of the wireless channel by using a preset hopping period and a hopping frequency interval.

Korean Patent Publication No. 2012-0042784 (Apr. 24, 2012)

An object of the present invention is to provide a narrowband frequency hopping device between a communication terminal and a base station that increases the reception performance of a communication terminal by using frequency hopping from the base station to the object communication terminal.

The object of the present invention is to provide a narrowband frequency hopping device between a base station and a base station which repeatedly transmits a downlink signal of a base station through a frequency hopping device to enhance reception performance and adapt to a radio channel to change a frequency hopping pattern, There is another purpose.

A narrowband frequency hopping apparatus between an object communication terminal and a base station according to the present invention includes a object communication terminal for receiving a downlink signal using frequency hopping in a base station.

Here, the frequency hopping includes a primary synchronization channel (PSS), a secondary synchronization channel (SSS), a physical control format indicator channel (PCFICH), a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH) , A PHICH (physical hybrid ARQ channel), and a PMCH (physical multicast channel).

It is further preferable that the frequency hopping is used in the same pattern within the cell radius serviced by the base station.

Here, it is more preferable that the frequency hopping is repeatedly used in a certain pattern.

Further, it is more preferable that frequency hopping is used in a random pattern within a certain length.

Here, it is more preferable that the frequency hopping is used in a pattern except for a specific frequency band.

It is further preferable that the frequency hopping is used in a pattern suitable for the channel state after the scanning is performed on the radio channel state between the base station and the object communication terminal.

It is more preferable that the frequency hopping is used in a variable pattern previously notified to the object communication terminal.

It is more preferable that the frequency hopping is used in accordance with the radio channel state between the base station and the object communication terminal in the frequency hopping candidate pattern.

It is more preferable that the frequency hopping is used by varying the pattern according to the size of transmission data between the base station and the object communication terminal.

It is more preferable that the frequency hopping is used by varying the pattern according to the importance of transmission data between the base station and the object communication terminal.

It is more preferable that the object communication terminal does not use frequency hopping when the radio channel state between the base station and the object communication terminal is good.

Further, it is more preferable that the object communication terminal be designated to use and not to use frequency hopping from the base station.

Here, it is more preferable that the object communication terminal receives from the base station a frequency hopping downtime that does not use the frequency hopping for a certain period of time.

In addition, it is more preferable that the object communication terminal receives from the base station a dormant time between frequency hopping that is idle for a certain period of time between hopping of frequency hopping.

Here, it is more preferable that the object communication terminal receives a frequency hopping guard band, which is a frequency band not used for hopping between hopping bands of frequency hopping, from the base station.

Further, it is more preferable that the object communication terminal is fixedly or variably assigned a frequency hopping holding time from the base station for each frequency hopping.

Here, the object communication terminal uses time hopping simultaneously in frequency hopping or time hopping only without frequency hopping.

Also, the object communication terminal receives from the base station a narrow band or a usable narrow band including the minimum band in which the object communication terminal communicates with the base station in uplink and downlink signals.

Here, the object communication terminal communicates with the base station using at least narrow band that is aligned with the existing PRB mapping, and the narrow band includes at least one PRB and includes 6PRB.

Also, the object communication terminal receives at least PSS, SSS, PBCH within the system bandwidth without frequency hopping.

Here, the object communication terminal uses frequency hopping within the system bandwidth for at least one common message, at least for the cell extension, the response to RAR, paging, and MTC SIB (s).

Also, the object communication terminal supports narrowband frequency hopping and uses at least one of a sequential method, a random method, a limitation of the number of narrow bands, a hopping length, a hopping pattern length, a hopping pattern repeat number, And uses a hopping pattern.

The narrowband frequency hopping apparatus between the object communication terminal and the base station according to the present invention has an advantage of improving the reception performance of the object communication terminal by using frequency hopping from the base station to the object communication terminal.

Alternatively, the narrow band frequency hopping apparatus between the object communication terminal and the base station according to the present invention may increase the reception performance by repeatedly transmitting the downlink signal of the base station through the frequency hopping apparatus, and may improve the reception reliability by changing the frequency hopping pattern by adapting to the radio channel .

FIG. 1 is a block diagram of a narrowband frequency hopping apparatus between an object communication terminal and a base station according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a diagram illustrating a frame structure in which the base station of FIG. 1 uses frequency hopping to a object communication terminal.
FIG. 3 is a diagram illustrating an example of frequency hopping used by a base station of FIG. 1 as a object communication terminal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

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. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives included in the spirit and scope of the present invention.

Hereinafter, a narrowband frequency hopping apparatus between an object communication terminal and a base station according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a narrow band frequency hopping apparatus between an object communication terminal and a base station according to an embodiment of the present invention. FIGS. 2 and 3 are views for explaining FIG. 1 in detail.

Hereinafter, a narrowband frequency hopping apparatus between an object communication terminal and a base station according to an embodiment of the present invention will be described with reference to FIG. 1 to FIG.

1, a narrowband frequency hopping apparatus between an object communication terminal and a base station according to an embodiment of the present invention includes an object communication terminal (hereinafter, referred to as " object communication terminal ") 300 that receives a downlink signal using a frequency hopping 200).

Here, the object communication terminal 200 is a mobile communication terminal connected to the base station 100, and is a terminal used for object communication in a mobile communication system.

That is, the object communication terminal 200 is configured as a low-cost terminal, and communicates with the base station 100 by supplementing the existing LTE (Long Term Evolution) standard in order to minimize power consumption and processing.

For example, since the object communication terminal 200 can be located far away from the base station 100 and can be used with low power, it is necessary to increase the reception gain of the object communication terminal 200.

The base station 100 may repeatedly transmit the same data to the object communication terminal 200 or increase the reception gain of the object communication terminal 200 using the frequency hopping 400. [

FIG. 2 is a diagram illustrating a frame structure in which the base station 100 of FIG. 1 uses a frequency hopping 400 to the object communication terminal 200. The frequency hopping 400 includes a primary synchronization channel (PSS), a secondary synchronization channel (SSS), a physical control format indicator channel (PCFICH), a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH) a shared channel, a PHICH (physical hybrid ARQ channel), and a PMCH (physical multicast channel).

Also, the frequency hopping 400 is used in the same pattern within the cell radius serviced by the base station 100.

Here, the frequency hopping 400 is characterized in that a predetermined pattern is repeatedly used.

Also, the frequency hopping 400 is characterized by being used in a random pattern within a certain length.

That is, the object communication terminal 200 can use a simplified structure to minimize processing and reduce power consumption.

First, when the frequency hopping pattern is fixed, since it does not receive the real-time notification of the hopping pattern to be processed when the frequency hopping 400 is changed, it is possible to reduce the wireless channel waste between the base station 100 and the object communication terminal 200 .

In addition, when the same frequency hopping pattern is used in the cell, the base station 100 can reduce processing required for frequency hopping (400) scheduling, and the object communication terminal (200) There is an effect that a collision with the other terminal with respect to the hopping 400 can be prevented in advance.

On the other hand, the object communication terminal 200 receives a frequency hopping repeating cycle 360 in which the frequency hopping repeating cycle 360 is repeated one by one, It is advantageous in that wireless channel waste can be reduced.

The frequency hopping pattern in which the frequency hopping 400 hopping between frequency bands is used to uniformly use the frequency band used for the frequency hopping 400 using the random pattern within the frequency hopping repeat period 360 having the designated length .

The frequency hopping 400 can maintain a frequency hopping use frequency band 330 composed of 1 physical resource block (PBR) to 6 PRB as a bandwidth and a frequency hopping hold time 310 composed of at least one subframe.

Meanwhile, the frequency hopping retention time 310 may be changed every time, and between the frequency hopping 400 and the frequency hopping dwell time 320 and the frequency hopping guard band 340 may be used. Also, the frequency hopping repetition period 360 may be repeated one cycle at a time, and may be stopped by the frequency hopping pause time 370 before it is repeated.

The frequency hopping 400 according to another embodiment is used in a pattern except for a specific frequency band.

The frequency hopping 400 may be used in a pattern suitable for the channel state after the scanning of the radio channel state between the base station 100 and the object communication terminal 200 is performed.

That is, the radio channel environment between the base station 100 and the object communication terminal 200 may not consider the mobility of the object communication terminal 200, so that the radio channel environment characteristic may not change rapidly. Therefore, if the quality of a specific frequency band is not good, the quality is not good. Therefore, a frequency band where a lot of errors occur can be avoided and used.

Meanwhile, the object communication terminal 200 can use a frequency hopping pattern for hopping only a good frequency band after the scanning of the radio channel state between the base station 100 and the object communication terminal 200 is performed .

The frequency hopping 400 according to another embodiment is characterized in that it is used in a variable pattern previously notified to the object communication terminal 200. [

In addition, the frequency hopping 400 is characterized in that any one of the candidate patterns of the frequency hopping 400 is designated according to a radio channel state between the base station 100 and the object communication terminal 200.

Here, the frequency hopping 400 is characterized in that the pattern is varied according to the size of transmission data between the base station 100 and the object communication terminal 200.

In addition, the frequency hopping 400 is characterized in that the pattern is varied according to the importance of transmission data between the base station 100 and the object communication terminal 200.

Here, the object communication terminal 200 does not use the frequency hopping 400 when the radio channel state between the base station 100 and the object communication terminal 200 is good.

Also, the object communication terminal 200 is characterized in that the use and nonuse of the frequency hopping 400 is designated from the base station 100.

That is, the object communication terminal 200 can use the wireless channel efficiently by using the frequency hopping 400 in a variable manner.

In the case of the object communication terminal 200, since it is difficult to transmit the frequency hopping pattern every time, the candidate group of the frequency hopping 400 can be designated and the number can be designated from at least two to sixteen.

A suitable radio channel candidate group can be used according to the radio channel condition. For example, when the radio channel state is poor due to interference by other terminals between the base station 100 and the object communication terminal 200, the frequency hopping 400 may be frequently used to increase the frequency hopping gain.

On the other hand, when the number of transmission data is large, the data transmission rate may be reduced in the embodiment requiring a pause time every frequency hopping 400, so that the frequency hopping 400 needs to be performed slowly.

On the other hand, when data having a high level of importance is transmitted, frequency hopping 400 can be frequently used in order to reduce reception errors for a specific frequency.

Lastly, when the channel state is good, the object communication terminal 200 may use only a fixed frequency band without using the frequency hopping 400, thereby minimizing the transmission speed degradation due to the frequency hopping 400. [

When the channel state is good or the object communication terminal 200 does not support the frequency hopping 400, the object communication terminal 200 transmits the used and unused information to the base station 100 so that the frequency hopping 400 is not used. Can be notified.

The object communication terminal 200 according to another embodiment of the present invention is characterized in that the base station 100 receives a frequency hopping pause time 370 in which the frequency hopping 400 is not used for a predetermined period of time.

In addition, the object communication terminal 200 is characterized in that the base station 100 receives a dormancy 320 between frequency hopping dormant for a certain period of time between hopping of the frequency hopping 400.

Herein, the object communication terminal 200 is characterized in that a frequency hopping guard band 340, which is a frequency band not used for hopping between hopping bands of the frequency hopping 400, is designated from the base station 100.

That is, the object communication terminal 200 can stably operate the object communication terminal 200 by setting the idle time without using the frequency hopping 400 at all times, and shortening the processing time.

For example, if the object communication terminal 200 can not perform the frequency hopping 400 or the base station 100 can not perform the frequency hopping 400 for another reason, the object communication terminal 200 may transmit The base station 100 may be informed of start time, end time, and reason for not performing the frequency hopping 400.

This idle time may be a frequency hopping dwell time 370 or a frequency hopping dwell time 320.

On the other hand, depending on the characteristics of the terminal, a frequency hopping guard band 340 indicating a dormant band other than a dormant time may be used.

That is, the frequency hopping guard band 340 can be used when the frequency hopping 400 is used and because of the structure problem of the transmission / reception filter of the object communication terminal 200, interference between the adjacent transmission and reception bands can be used, The inter guard band 340 may use at least one PRB.

The object communication terminal 200 according to another embodiment of the present invention is characterized in that a frequency hopping retention time 310 is fixedly or variably designated by the base station 100 for each frequency hopping 400.

That is, the same time may be used for each hopping in the frequency hopping 400, but a good frequency band may be hopped redundantly due to the characteristics of the wireless channel.

Therefore, although the minimum time of the frequency hopping 400 may be designated as one subframe, the subframe may be used without being designated separately.

The object communication terminal 200 according to another embodiment may use the time hopping simultaneously or only the time hopping without the frequency hopping 400 in the frequency hopping 400. [

That is, the gain of the time hopping can be obtained by the effect of obtaining the gain of the frequency hopping 400.

In case of the object communication terminal 200, reliable data transmission may be more important than processing in real time.

Accordingly, it is possible to use frequency hopping 400 and time hopping simultaneously or time hopping instead of frequency hopping 400. [

The object communication terminal 200 according to another embodiment of the present invention may transmit the size of the narrow band including the minimum band in which the object communication terminal 200 communicates with the base station 100 or the usable narrow band from the base station 100 .

Here, the object communication terminal 200 communicates with the base station 100 using at least a narrow band that is aligned with the existing PRB mapping, and the narrow band includes at least one PRB, and 6PRB may be used.

That is, the minimum band to be communicated by the base station 100 and the object communication terminal 200 can be defined as a narrow band and can also be defined by other methods. The minimum bandwidth may be 1PRB, which is the minimum bandwidth for communication in LTE, and the smallest data may use one subcarrier. Generally, six PRBs are used as a basis in consideration of the transmission capacity of the object communication terminal 200 .

However, depending on the application, it may be used in 2 to 5 PRBs when data is small, and may be used as a multiplier of 2 in order to freely express data.

However, although the object communication terminal 200 is as simple as on / off, since the data capacity such as image transmission is large, the narrowband definition can be used up to half of the system bandwidth.

The object communication terminal 200 according to yet another embodiment can receive at least the PSS, the SSS, and the PBCH without frequency hopping 400 within the system bandwidth.

Here, the object communication terminal 200 can use the frequency hopping 400 within the system bandwidth for at least any one of the common messages, at least for the cell extension, the RAR, the paging, and the response to the MTC SIB (s) .

In the case of PSS, SSS, and PBCH, since the object communication terminal 200 is the first portion to receive, there is not enough time to recognize and perform the frequency hopping 400. Therefore, PSS, SSS, and PBCH may use a predefined frequency band without using frequency hopping (400).

Also, since the object communication terminal 200 needs to have high reception sensitivity in order to expand the cell, the common message RAR, paging, and MTC SIB (s) can be received using the frequency hopping 400.

The object communication terminal 200 according to another embodiment of the present invention supports a narrowband frequency hopping 400 and is configured to support an inter-narrowband frequency hopping 400 and to control the inter-band frequency hopping 400 according to an order method, a random method, A hopping pattern can be used by using at least one of narrow band positions.

That is, the hopping pattern can be used in various ways. Narrow bands such as 1, 2, 3, 4, and 5 can be designated sequentially or narrow bands by random occurrence formula such as CRC.

The length of the frequency hopping 400 capable of transmitting and receiving the repeated data in the hopping can be appropriately used according to the length in which the wireless environment can be slowly changed so that the hopping gain can be obtained and at least one of the 128 lengths can be prevented from exceeding have.

Also, it is possible to simplify the processing in the object communication terminal 200 so that the length of the hopping pattern is not sufficiently long, so that any value of 32 times or less the maximum number of narrow bands can be used.

The position of the initial narrow band may be defined and used. Alternatively, the initial narrow band position may be defined and used for each object communication terminal 200 according to the type of the object communication terminal 200.

The MTC uses a narrow band where the narrow band means a subcarrier unit in the minimum band used for transmission of information from the object communication terminal 200 to the base station 100 or the base station 100 to the object communication terminal 200, Can be used in PRB units.

6PRB can be used as a base, but it can be used in units of 1, 2, 4 and 8PRB depending on the amount of data of MTC. It can be used as 6PRB or 5PRB in units of 6, 12, 18PRB or 6, It can also be used in multiples of 5 as shown in Fig.

When the basic unit such as 3PRB, 5PRB, 7PRB, and 9PRB is used as the number of holes, the center frequency can be used as a PRB positioned in the middle, which is advantageous in that modulation and demodulation are simple.

On the other hand, in case of 2PRB, 4PRB or 8PRB, center frequency is located between PRBs, which is inconvenient for modulation and demodulation, and 2PRB is used as the smallest unit, but data processing is advantageous.

The narrow band notification method may be transmitted by a channel through which the base station 100 transmits the base station information to the object communication terminal 200 or a channel that performs resource block allocation as well as notifying the frequency hopping information.

Since MTC uses narrow band, it can perform frequency hopping between subcarriers in a narrow band. However, in order to increase the frequency effect, frequency hopping can be performed in narrow band units.

The candidate band of frequency hopping may be adjacent to the first band, but non-adjacent bands may be used to increase the frequency hopping gain.

The PDSCH hopping can be performed only when the frequency hopping field of the PDSCH is set to enable. The frequency hopping field is a downlink information control channel or resource block allocation transmitted from the base station 100 to the object communication terminal 200 Lt; / RTI > channel.

Frequency hopping may be used between timeslots within one subframe or between subframes. It is also possible to use both the subframe and the subframe simultaneously.

The number of resource blocks used for hopping can be reported through the hopping offset related parameter of the PDSCH.

The base station may use a hopping pattern used in the PUSCH for frequency hopping, or may designate an arbitrary pattern of the base station.

For frequency hopping, information about subframes and timeslots of frequency hopping in which the first PDSCH will be located may be transmitted from the PDSCH resource allocation field.

If the hopping pattern is not separately specified, the currently set hopping pattern can be used.

The hopping pattern can be divided into a case where one subband is a hopping unit and a case where a plurality of subbands are used.

The object communication terminal 200 according to another embodiment holds the frequency hopping 400 as a candidate and determines a frequency hopping 400 used for communication between the base station 100 and the object communication terminal 200, .

In the case of the object communication terminal 200, there are many types of terminals used for object communication, and it may be difficult for the base station 100 to assign the frequency hopping 400 to the object communication terminal 200, The object communication terminal 200 may provide the frequency hopping 400 to the base station 100 in some cases.

3 (a), the frequency hopping 400 used between the base station 100 and the object communication terminal 200 may use a mirror type. When an even narrow band is used, Hopping between narrow bands with the same center frequency and distance, or between narrow bands below the center frequency and narrow bands above the center frequency based on the center frequency.

When an odd number of narrow bands are used, as shown in FIG. 3 (b), the center frequency is not hopped and the same hopping as the even number of narrow bands is used, or the narrowest narrow band And hopping between the narrowest frequency band of the highest frequency and the narrow frequency band of the center frequency while hopping between the narrowband of the center frequency and the narrowband of the center frequency.

At this time, the center frequency is set so that the narrowest band of the highest frequency occupies the center frequency when the narrowest band of the lowest frequency occupies the narrow band of the center frequency through the scheduling, and conversely, When occupying the narrow band of the frequency, the narrowest band of the lowest frequency can be performed so as not to occupy the center frequency.

The object communication terminal 200 according to another embodiment may require a retuning time between frequency hopping 400. The retransmission time may not exceed 20 time slots, one frame time per one time slot And the retuning time can be set so as not to exceed 10 subframes, one frame time per one subframe.

The object communication terminal 200 according to another embodiment of the present invention is configured to set the virtual narrowband regardless of the physical narrowband through the virtual narrowband and to sequentially map the narrowband of the physical channel to the narrowband of the physical channel, You can start from scratch.

That is, since the physical narrow bandwidth and the number can be set differently according to the base station 100 and the object communication terminal 200, it is difficult to set the hopping pattern differently. Therefore, the frequency hopping pattern can be defined through the virtual narrow band.

Here, the virtual narrowband may be based on 6PRB, but it may be set based on 1PRB to facilitate implementation.

In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, these functions may be stored or transmitted as one or more instructions or code on a computer readable medium. Computer-readable media includes both communication media and computer storage media including any medium that facilitates transfer of a computer program from one place to another.

The storage medium may be any available media that is accessible by a computer. By way of example, and not limitation, such computer-readable media can comprise any computer-readable medium, such as RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, And any other medium that can be used to store and be accessed by a computer. Also, any connection may be properly referred to as a computer-readable medium.

In an implementation in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor and external to the processor, in which case the memory unit may be communicatively coupled to the processor by various means as is known.

In a hardware implementation, the processing units may be implemented as one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays Controllers, microcontrollers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.

What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe all possible combinations of components or methods for purposes of describing the embodiments described, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims.

Furthermore, to the extent that the term "comprising" is used in the detailed description or the claims, such term is intended to be embodied in a manner similar to that which is constructed as interpreted when used in a transitional word in the claims.

As described above, the narrowband frequency hopping apparatus between the object communication terminal and the base station according to the present invention has an advantage of improving the reception performance of the object communication terminal by using frequency hopping from the base station to the object communication terminal, Signal is repeatedly transmitted to increase the reception performance and adapt to the wireless channel to change the frequency hopping pattern, thereby improving the reception reliability.

Claims (23)

And an object communication terminal for receiving a downlink signal using frequency hopping at the base station. The method according to claim 1,
The frequency hopping includes a primary synchronization channel (PSS), a secondary synchronization channel (SSS), a physical control format indicator channel (PCFICH), a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH) a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH) in at least one of physical downlink shared channel (PHICH), physical hybrid ARQ channel (PHICH) Wherein the narrowband frequency hopping device is a narrow band frequency hopping device between the object communication terminal and the base station. The method according to claim 1,
Wherein the frequency hopping is used in the same pattern within a cell radius served by the base station. The method according to claim 1,
Wherein the frequency hopping is repeatedly used in a predetermined pattern. The method according to claim 1,
Wherein the frequency hopping is used in a random pattern within a predetermined length. The method according to claim 1,
Wherein the frequency hopping is used in a pattern except for a specific frequency band. The method according to claim 1,
Wherein the frequency hopping is used in a pattern suitable for the channel state after scanning the wireless channel state between the base station and the object communication terminal. The method according to claim 1,
Wherein the frequency hopping is used in a variable pattern previously notified to the object communication terminal. The method according to claim 1,
Wherein the frequency hopping is used in accordance with a radio channel state between the base station and the object communication terminal among the candidate patterns of the frequency hopping. The method according to claim 1,
Wherein the frequency hopping is used by varying a pattern according to a transmission data size between the base station and the object communication terminal. The method according to claim 1,
Wherein the frequency hopping is used by varying a pattern according to importance of transmission data between the base station and the object communication terminal. The method according to claim 1,
Wherein the object communication terminal does not use the frequency hopping when the radio channel state between the base station and the object communication terminal is good. The method according to claim 1,
Wherein the object communication terminal is designated to use or not use the frequency hopping from the base station. The method according to claim 1,
Wherein the object communication terminal is assigned a frequency hopping dormancy time not to use the frequency hopping for a predetermined period of time from the base station. The method according to claim 1,
Wherein the object communication terminal is designated by the base station for a dormancy between frequency hopping that is idle for a certain period of time between hopping of the frequency hopping. The method according to claim 1,
Wherein the object communication terminal is provided with a guard band between frequency hopping that is a frequency band not used for hopping between hopping bands of the frequency hopping from the base station. The method according to claim 1,
Wherein the object communication terminal is fixedly or variably assigned a frequency hopping hold time for each frequency hopping from the base station. The method according to claim 1,
Wherein the object communication terminal simultaneously uses the time hopping in the frequency hopping or the time hopping only in the frequency hopping without using the frequency hopping. The method according to claim 1,
Wherein the object communication terminal receives from the base station a narrow band or a usable narrow band including the minimum band in which the object communication terminal communicates with the base station in uplink and downlink signals, Narrow band frequency hopping device. The method according to claim 1,
Wherein the object communication terminal communicates with the base station using at least a narrow band that is aligned with the existing PRB mapping, the narrow band includes at least one PRB, and the object communication terminal uses 6PRB. Narrow band frequency hopping device. The method according to claim 1,
Wherein the object communication terminal receives at least the PSS, the SSS, and the PBCH in the system bandwidth without the frequency hopping. The method according to claim 1,
Wherein said object communication terminal uses said frequency hopping within a system bandwidth for at least any one of a common message of RAR, paging, and a response to MTC SIB (s), at least in cell extension. A narrow band frequency hopping device between a terminal and a base station. The method according to claim 1,
The object communication terminal supports the frequency hopping between the narrow bands, and can perform at least one of an order method, a random method, a restriction of a narrow band number, a hopping length, a hopping pattern length, And the hopping pattern is used by using the hopping pattern.
KR1020150071914A 2015-05-22 2015-05-22 Narrow band frequency hopping device between machine type communication and base station KR20160137839A (en)

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CN110710120A (en) * 2017-04-11 2020-01-17 弗劳恩霍夫应用研究促进协会 Transmitter and receiver and corresponding method
WO2023211196A1 (en) * 2022-04-28 2023-11-02 엘지전자 주식회사 Method for transmitting and receiving signal on basis of frequency hopping in wireless communication system, and device therefor

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KR20120042784A (en) 2012-02-27 2012-05-03 석 규 이 Oil collection fence with zipper pocket for oil separation function and removable buoyancy body

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KR20120042784A (en) 2012-02-27 2012-05-03 석 규 이 Oil collection fence with zipper pocket for oil separation function and removable buoyancy body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110710120A (en) * 2017-04-11 2020-01-17 弗劳恩霍夫应用研究促进协会 Transmitter and receiver and corresponding method
WO2023211196A1 (en) * 2022-04-28 2023-11-02 엘지전자 주식회사 Method for transmitting and receiving signal on basis of frequency hopping in wireless communication system, and device therefor

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