KR20140034094A - Apparatus and method for transmitting discovery signal - Google Patents

Apparatus and method for transmitting discovery signal Download PDF

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Publication number
KR20140034094A
KR20140034094A KR1020130108501A KR20130108501A KR20140034094A KR 20140034094 A KR20140034094 A KR 20140034094A KR 1020130108501 A KR1020130108501 A KR 1020130108501A KR 20130108501 A KR20130108501 A KR 20130108501A KR 20140034094 A KR20140034094 A KR 20140034094A
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KR
South Korea
Prior art keywords
discovery
discovery signal
signal
data
data subcarriers
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KR1020130108501A
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Korean (ko)
Inventor
윤찬호
김형진
조승권
김성경
정수정
장성철
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한국전자통신연구원
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Priority to US14/022,797 priority Critical patent/US20140071916A1/en
Publication of KR20140034094A publication Critical patent/KR20140034094A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/14—Mobility data transfer between corresponding nodes

Abstract

A device transmits a discovery signal including the device′s identification information at an empty slot found in the multiple discovered slots in a discovered domain. The discovery signal includes two OFDM symbols. One of the two OFDM symbols includes one or more tones, and displays the device′s identification information to the sub-carrier location of at least one tone. [Reference numerals] (810) Signal generating unit; (820) Signal transmitting unit; (830) Signal receiving unit

Description

Method and apparatus for transmitting discovery signal {APPARATUS AND METHOD FOR TRANSMITTING DISCOVERY SIGNAL}

The present invention relates to a method and apparatus for transmitting discovery signals, and more particularly, to a method and apparatus capable of discovering a plurality of neighboring devices without infrastructure.

The conventional technology for checking the existence of the existence between wireless devices has been representatively applied to Bluetooth. In the case of Bluetooth, the manufacturer and serial number of the device are encoded, and the access code is used as a preamble to recognize each other's devices. This method cannot express all the MAC-IDs of the host, and also has the disadvantage that the device has a rather complicated hardware characteristic (frequency hopping spread spectrum modulation method) dedicated to Bluetooth.

In order to demodulate this type of code, a relationship called master / slave must be established, and the receiving end needs to analyze and search the code to find the code. Because the master / slave relationship is the default setting, the network is also limitedly supported, and there are limitations in the way the device is represented and the complexity of the transmission and reception process. In addition, because it is suitable for ultra short-range communication, there was a limit that is not suitable for long-distance data communication.

Qualcomm recently announced the FlashlinQ specification for adjacent communications. The FlashLink specification also proposes a communication scheme for identifying adjacent devices. Unlike Bluetooth, FlashLink is designed to identify a device with its own hardware (H / W) address, MAC address and service ID, without using a special manufacturer and serial number to generate a code. The distance is about 1km. However, in order not to overlap the transmission signals between devices, a global synchronization reference signal is required, which requires an infrastructure such as a mobile communication base station or a GPS. Bluetooth, on the other hand, does not require a separate infrastructure.

As such, although Bluetooth can synchronize neighboring devices without infrastructure, it is impossible to find a plurality of neighboring devices due to communication distance and specification problems. Flashlinks, on the other hand, can find many adjacent devices, but they rely heavily on the infrastructure needed to synchronize devices.

An object of the present invention is to provide a discovery signal transmission method and apparatus capable of discovering a plurality of adjacent devices without an infrastructure.

According to one embodiment of the invention, a method is provided for a device to transmit a discovery signal. The method for transmitting a discovery signal includes generating a discovery signal including identification information of the device, and transmitting the discovery signal in an empty discovery slot of a plurality of discovery slots in a discovery interval, wherein the discovery signal is 2 Includes OFDM symbols, one OFDM symbol of the two OFDM symbols includes at least one tone, and indicates identification information of the device at a subcarrier position corresponding to the at least one tone.

The other OFDM symbol of the two OFDM symbols may include a preamble.

The preamble may include a plurality of golay sequences.

The golay sequence may have a length of 128.

The transmitting may include differentially modulating the at least one tone.

The discovery signal transmission method may further include discovering a neighboring device from a discovery signal received in a discovery slot other than the empty discovery slot among the plurality of discovery slots.

According to another embodiment of the present invention, an apparatus for transmitting a discovery signal of a device is provided. The discovery signal transmission apparatus includes a signal generator and a signal transmitter. The signal generator generates a discovery signal including identification information of the device. The signal transmitter detects an empty discovery slot among a plurality of discovery slots in a discovery interval and transmits the discovery signal in the empty discovery slot. The discovery signal includes two OFDM symbols, one OFDM symbol of the two OFDM symbols includes at least one Golay sequence used as a preamble, and the other OFDM symbol indicates identification information of the device. It may include.

The signal generator may display identification information of the device from a location of a data subcarrier including a plurality of tones among a plurality of data subcarriers of the other OFDM symbol.

Two tones constitute one tone pair, and the signal transmitter may differentially modulate at least one tone pair.

Among the plurality of data subcarriers, the data subcarrier that does not include the plurality of tones may be a null subcarrier file.

The discovery signal transmission device may further include a signal receiver. The signal receiver discovers an adjacent device by listening to a discovery signal in at least one discovery slot of the plurality of discovery slots.

According to an embodiment of the present invention, it is possible to find a plurality of adjacent devices efficiently without the infrastructure.

1 is a view showing an example of a frame according to an embodiment of the present invention.
2 is a diagram illustrating an example of a discovery zone according to an embodiment of the present invention.
3 is a diagram illustrating an example of a discovery signal according to an embodiment of the present invention.
4 is a diagram illustrating an example of a method of displaying information using OFDM data symbols according to an embodiment of the present invention.
5 and 6 are diagrams illustrating another example of a method for displaying information by using an OFDM data symbol according to an exemplary embodiment of the present invention.
7 is a diagram illustrating another example of a method for displaying information by using an OFDM data symbol according to an embodiment of the present invention.
8 is a diagram illustrating an apparatus for transmitting discovery signal of a device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification and claims, when a section is referred to as "including " an element, it is understood that it does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Now, a discovery signal transmission method and apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an example of a frame according to an embodiment of the present invention, Figure 2 is a view showing an example of a discovery zone according to an embodiment of the present invention.

Referring to FIG. 1, some of the frames of the entire frame are frames including a discovery section 10. In addition, the frame may further include a data section 20 and a synchronization section 30.

The discovery section 10 is a section in which each device finds devices adjacent to it.

The time synchronization between devices may be performed by a beacon signal transmitted and received in the synchronization section 20.

Referring to FIG. 2, the discovery section 10 includes a plurality of discovery slots, for example, 17 discovery slots T1 to T17. The device broadcasts a discovery signal including device identification information in an empty slot among the plurality of discovery slots, and discovers a neighboring device by listening to (receiving) a discovery signal broadcast by a neighboring device in another discovery slot.

3 is a diagram illustrating an example of a discovery signal according to an embodiment of the present invention. In FIG. 3, only a discovery signal corresponding to one discovery slot T1 is illustrated for convenience of description.

Referring to FIG. 3, one discovery signal includes two OFDM symbols. One OFDM symbol of the two OFDM symbols includes a preamble. The preamble includes a plurality of Golay sequences, for example, a plurality of Golay 128 sequences Ga128. The receiving end detects the discovery section using the preamble. In this case, the preamble may further include a Golay-128 sequence (-Ga128) to increase the detection probability of the discovery section of the receiver.

The Golay 128 sequence has a length of 128 and the Golay sequence is "-1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1,- 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1 , -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1,- 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1 , -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1 ". The Golay sequence is used for channel estimation, and using the Golay sequence has the advantage that the cross-correlator of the receiving end can be very simply implemented. For example, it is possible to design a cross correlator with a structure that requires only seven additions to obtain cross correlation of a Golay sequence having a length of 128.

The other OFDM symbol of the two OFDM symbols includes data. The data may include identification information of the device. For convenience of description, an OFDM symbol including data is called an OFDM data symbol.

An OFDM data symbol represents information in the position of a tone. The information may be identification information of the device. The OFDM data symbol includes a plurality of valid data subcarriers, and is a position of a data subcarrier including a tone among the plurality of valid data subcarriers, and may indicate the number of bits and information of bits, that is, identification information of a device. In this case, except for a data subcarrier containing a tone among the plurality of valid data subcarriers, the remaining data subcarriers are null subcarriers, and the tones have power enough to be distinguished from a null signal.

4 is a diagram illustrating an example of a method of displaying information using OFDM data symbols according to an embodiment of the present invention.

For example, assume that an OFDM data symbol includes eight data subcarriers on the frequency axis as shown in FIG. 4. The eight data subcarriers S1 to S8 represent 000, 001, 010, 011, 100, 101, 110, and 111, respectively, according to their positions. At this time, if a tone is included in the data subcarrier S4, the receiver can recognize 3 bits of information 011 from the position of the data subcarrier S4 containing the tone.

As such, the information may be represented by the position of one tone, but the information may be represented by the position of at least two tones.

5 and 6 are diagrams illustrating another example of a method for displaying information by using an OFDM data symbol according to an exemplary embodiment of the present invention.

As shown in FIG. 5, an OFDM data symbol may include 432 valid data subcarriers. Two data subcarriers consist of one subcarrier pair, two tones consist of one tone pair, and one pair of tones can fit into one subcarrier pair. In this case, information may be represented by a location of a data subcarrier including a tone pair. In the structure shown in FIG. 5, a total of 43 bits may be represented by one OFDM data symbol.

Specifically, 432 effective data subcarriers are divided into a plurality of regions, and the information is represented by the positions of the data subcarriers each containing a plurality of tone pairs in the plurality of regions. At this time, each region may indicate the position of the bit.

For example, 432 valid data subcarriers have 11 regions: 64 data subcarriers, 32 data subcarriers, 16 data subcarriers, 64 data subcarriers, 16 data subcarriers, 32 data subcarriers, 16 data subcarriers, Assume that the data is divided into 64 data subcarriers, 32 data subcarriers, 32 data subcarriers, and 64 data subcarriers.

The 64 data subcarriers can represent 32 positions, and thus the 64 data subcarriers can represent 5 bits of information. The 32 data subcarriers may represent 16 positions, and thus the 32 data subcarriers may represent 4 bits of information. The 16 data subcarriers may represent 8 positions, and thus 16 bits may represent 3 bits of information.

Therefore, 64 data subcarriers, 16 data subcarriers, 8 data subcarriers, 64 data subcarriers, 8 data subcarriers, 16 data subcarriers, 8 data subcarriers, 64 data subcarriers, and 16 data subcarriers corresponding to 11 regions. Data subcarriers, 32 data subcarriers, and 64 data subcarriers can represent 5 bits, 3 bits, 4 bits, 5 bits, 4 bits, 3 bits, 3 bits, 5 bits, 4 bits, 4 bits, and 5 bits, respectively. As a result, a total of 43 bits of information can be represented.

For example, "0000000000000000000000000000000000000000000" may be represented by inserting 11 tone pairs into the first subcarrier pair of 11 regions as shown in FIG.

In this case, when 432 effective data subcarriers are divided into 11 areas, 64 data subcarriers, 32 data subcarriers, 16 data subcarriers, 64 data subcarriers, 32 data subcarriers, 16 data subcarriers, 64 have a predetermined pattern or periodicity. It may be divided into three data subcarriers, 32 data subcarriers, 16 data subcarriers, 64 data subcarriers, and 32 data subcarriers. However, by dividing the region with a constant pattern or periodicity, the PAPR increases when the signal in the frequency domain is converted into a signal in the time domain. Thus, 432 effective data subcarriers, for example, 64 data subcarriers, 32 data subcarriers, 16 data subcarriers, 64 data subcarriers, 16 data subcarriers, 32 data subcarriers, 16 data subcarriers without a constant pattern or periodicity. The PAPR can be reduced by dividing into 64 data subcarriers, 32 data subcarriers, 32 data subcarriers, and 64 data subcarriers.

As such, since a total of 43 bits of identification information of a device can be represented by one OFDM data symbol using 11 tone pairs, the device can express all MAC addresses, and a plurality of devices can be represented without infrastructure from the frame structure of FIG. Multiple adjacent devices can be found from the discovery slots.

7 is a diagram illustrating another example of a method for displaying information by using an OFDM data symbol according to an embodiment of the present invention.

Referring to FIG. 7, for example, suppose that there are 16 data subcarriers S1 to S16 on the frequency axis, and two data subcarriers form one data subcarrier pair P1 to P8. The eight data subcarrier pairs P1 to P8 represent 000, 001, 010, 011, 100, 101, 110, and 111, respectively, according to their positions. If a tone is included in the data subcarrier pair P4, the receiver can recognize 3 bits of information 011 from the position of the data subcarrier pair P4 containing the tone. In this case, the device may differentially modulate two tones of the data subcarrier pair P4. Using this differential modulation method, it is possible to indicate additional one bit information of "0" or "1". That is, since bit 0 or bit 1 can be represented from the phase difference of two tones of the data subcarrier pair P4, one bit of information can be further represented by differentially modulating the two tones. For example, as shown in FIG. 6, when the QPSK signals of the two tones are 1 + j and -1-j, respectively, 180 degrees of phase difference may occur and bit 1 may be represented therefrom.

For example, in the case of Figure 5, by differentially modulating the 11 tone-pairs, the device can represent 11 more bits, which in turn can represent a total of 54 bits (43 bits + 11 bits) of information.

In addition, by using a differential modulation method, the reception performance can be improved at the receiving end, and two tones of the data subcarrier pair P4 can be demodulated with low complexity without a channel estimation process.

8 is a diagram illustrating an apparatus for transmitting a discovery signal of a device according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the device includes a signal generator 810, a signal transmitter 820, and a signal receiver 830.

The signal generator 810 generates a discovery signal including identification information of the device. The discovery signal includes two OFDM symbols as described above. One OFDM symbol of the two OFDM symbols includes a Golay sequence, and the other OFDM symbol includes identification information of the device. The identification information of the device may be represented by the position of the data subcarrier containing at least one tone in the OFDM symbol.

The signal transmitter 820 detects an empty discovery slot among the plurality of discovery slots, and broadcasts a discovery signal in the empty discovery slot. In this case, the signal transmitter 820 may differentially modulate the data subcarriers containing at least one tone.

The signal receiver 830 listens (receives) a discovery signal broadcast by the neighboring device in at least one discovery slot of the plurality of discovery slots and discovers the presence of the neighboring device.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, Such an embodiment can be readily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (14)

A method by which a device transmits a discovery signal,
Generating a discovery signal comprising identification information of the device, and
Transmitting the discovery signal in an empty discovery slot among a plurality of discovery slots in a discovery interval.
Including;
The discovery signal comprises two OFDM symbols,
One OFDM symbol of the two OFDM symbols includes at least one tone,
A discovery signal transmission method indicating identification information of the device at a subcarrier position corresponding to the at least one tone. In claim 1,
The other OFDM symbol of the two OFDM symbols comprises a preamble. 3. The method of claim 2,
The preamble includes a plurality of golay sequences. 4. The method of claim 3,
And a length of the golay sequence is 128. 4. The method of claim 3,
The Golay sequence is -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, 1 , 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, -1 , -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, 1 , -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1 , 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1 , 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1 Discovery signal transmission method comprising -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1. In claim 1,
And wherein the transmitting step comprises differentially modulating the at least one tone. In claim 1,
Discovering a neighboring device from a discovery signal received in a discovery slot other than the empty discovery slot of the plurality of discovery slots;
The discovery signal transmission method further comprising. Apparatus for transmitting a discovery signal of a device,
A signal generator for generating a discovery signal including identification information of the device, and
A signal transmitter which detects an empty discovery slot among a plurality of discovery slots in a discovery interval and transmits the discovery signal in the empty discovery slot.
Lt; / RTI >
The discovery signal comprises two OFDM symbols,
One OFDM symbol of the two OFDM symbols includes at least one Golay sequence used as a preamble, and the other OFDM symbol includes identification information of the device. 9. The method of claim 8,
And the signal generation unit displays identification information of the device from a position of a data subcarrier including a plurality of tones among a plurality of data subcarriers of the other OFDM symbol. The method of claim 9,
Two tones are in one tone pair,
And the signal transmitter differentially modulates at least one tone pair. The method of claim 9,
And a data subcarrier in which the plurality of tones are not included among the plurality of data subcarriers is a null subcarrier. 9. The method of claim 8,
And a discovery signal transmission device having a length of 128. 9. The method of claim 8,
The Golay sequence is -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, 1 , 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, -1 , -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, 1 , -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1 , 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1 , 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1 Discovery signal transmitting apparatus comprising -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1. 9. The method of claim 8,
A signal receiver for discovering an adjacent device by listening to a discovery signal in at least one discovery slot of the plurality of discovery slots.
Discovery signal transmission device further comprising.
KR1020130108501A 2012-09-11 2013-09-10 Apparatus and method for transmitting discovery signal KR20140034094A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170022360A (en) * 2015-08-20 2017-03-02 한국전자통신연구원 Communication mode identification method for performing the wireless apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170022360A (en) * 2015-08-20 2017-03-02 한국전자통신연구원 Communication mode identification method for performing the wireless apparatus

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