KR101790232B1 - Low latency uplink data transmission method and system - Google Patents

Low latency uplink data transmission method and system Download PDF

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Publication number
KR101790232B1
KR101790232B1 KR1020160011438A KR20160011438A KR101790232B1 KR 101790232 B1 KR101790232 B1 KR 101790232B1 KR 1020160011438 A KR1020160011438 A KR 1020160011438A KR 20160011438 A KR20160011438 A KR 20160011438A KR 101790232 B1 KR101790232 B1 KR 101790232B1
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KR
South Korea
Prior art keywords
uplink data
base station
random access
access preamble
data transmission
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KR1020160011438A
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Korean (ko)
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KR20170090731A (en
Inventor
최성현
김선도
이기택
김준석
박승일
Original Assignee
서울대학교 산학협력단
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Priority to KR1020160011438A priority Critical patent/KR101790232B1/en
Priority to US15/368,933 priority patent/US10660133B2/en
Publication of KR20170090731A publication Critical patent/KR20170090731A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H04W28/044—
    • H04W72/042—
    • H04W72/1284—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
    • H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance

Abstract

A terminal and an uplink data transmission method are disclosed. A method of transmitting uplink data of a UE according to an aspect of the present invention includes the steps of transmitting an allocated random access preamble to a base station and repeatedly transmitting uplink data to the base station through a resource set corresponding to the allocated random access preamble . ≪ / RTI >

Description

TECHNICAL FIELD [0001] The present invention relates to an uplink data transmission method and system for low-

And more particularly to an uplink data transmission method and system for low delay communication.

In the LTE (Long Term Evolution) system, a method of transmitting and receiving data through a resource allocation process based on a base station scheduling is used in order to maximize resource utilization. That is, if there is data to be transmitted by the UE, the UE firstly makes an uplink resource allocation request to the Node B, and the UE transmits data using the uplink resource allocated by the Node B.

This causes latency in the uplink data transmission of the UE.

Particularly, when the uplink data to be transmitted by the mobile station is data requiring low delay, such a delay may cause the quality of service to be deteriorated.
[Prior Art Document] Published Japanese Patent Application No. 10-2010-0044822

And an uplink data transmission method and system for low-delay communication.

A method of transmitting uplink data of a UE according to an aspect of the present invention includes the steps of transmitting an allocated random access preamble to a base station and repeatedly transmitting uplink data to the base station through a resource set corresponding to the allocated random access preamble . ≪ / RTI >

The allocated random access preamble is distinguished from other terminals and can be used for identification of the terminal.

The step of repeatedly transmitting the uplink data may transmit the uplink data repeatedly after transmitting the allocated random access preamble to the base station.

The uplink data transmission method may further include a step of allocating the random access preamble from the base station.

The uplink data transmission method may further include receiving random access transmission time information from the base station.

The step of receiving the random access transmission time point information may receive the random access transmission time point information together with the system information.

The uplink data transmission method further includes a step of allocating a resource for retransmission from the base station when the uplink data fails to be transmitted and the step of retransmitting the uplink data to the base station through the allocated resources can do.

The resource for retransmission may be an uplink data transmission channel resource.

A terminal according to another aspect of the present invention includes a communication unit for transmitting data to a base station and receiving data from the base station, a control unit for controlling the communication unit to transmit the allocated random access preamble to the base station, And a controller for repeatedly transmitting uplink data to the base station through a set.

The allocated random access preamble is distinguished from other terminals and can be used for identification of the terminal.

The controller may transmit the uplink data repeatedly after transmitting the allocated random access preamble to the base station.

The communication unit may receive the random access transmission time information from the base station.

The communication unit may receive the random access transmission time information together with the system information.

The communication unit receives resource allocation information for retransmission from the base station when the uplink data fails to be transmitted, and the control unit controls the communication unit to retransmit the uplink data to the base station through the allocated resources .

The resource for retransmission may be an uplink data transmission channel resource.

According to another aspect of the present invention, there is provided a method for transmitting uplink data, the method comprising: transmitting a random access preamble allocated to a terminal to a base station; and transmitting, by the terminal, uplink data to the base station through a resource set corresponding to the allocated random access preamble. Determining whether the BS has failed to receive UL data transmitted from the UE and allocating UL data channel resources to the UE if the BS determines that the UE fails to receive UL data; And the UE retransmitting the uplink data failed to receive through the allocated uplink data transmission channel resource.

In case of uplink data requiring low delay, the delay time of the uplink transmission can be reduced by transmitting the uplink data immediately after transmitting the random access preamble. In addition, it is possible to reduce the probability of transmission failure that may occur due to a data transmission collision with another terminal by repeatedly transmitting uplink data.

Also, even if a particular terminal fails to transmit, the base station can determine which terminal has failed to transmit the failed terminal through the preamble and the corresponding resource. Therefore, resources for retransmission can be quickly allocated to the UE.

1 is a block diagram illustrating an embodiment of a mobile communication system.
2 is a diagram illustrating an embodiment of an uplink channel.
3 is a flowchart illustrating an embodiment of an uplink data transmission method.
FIG. 4 is a diagram illustrating an uplink data transmission method of FIG. 3;
5 is a flowchart showing another embodiment of the uplink data transmission method.
FIG. 6 is a diagram illustrating another method for transmitting uplink data in the case of uplink data transmission failure in FIG.
7 is a detailed configuration diagram of a mobile communication system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

The following description will be made on various shifts such as CDMA (code division multi, frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access CDMA may be implemented as a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000, and the TDMA may be implemented as a global system for mobile communications (GSM) / general packet radio service (GPRS) OFDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20 , Evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. generation partnership proj ect) Long term evolution (LTE) is part of E-UMTS (evolved UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), employing OFMA in the downlink and SC-FDMA in the uplink LTE-A (advanced) is the evolution of 3GPP LTE.

Hereinafter, LTE will be described for convenience of explanation, but the present invention is not limited to LTE. That is, the present invention can be applied to all communication systems and methods to which the technical idea of the present invention can be applied.

1 is a block diagram illustrating an embodiment of a mobile communication system.

Referring to FIG. 1, the mobile communication system may include at least one base station (BS) 20. Each base station 20 can provide a communication service to a specific geographical area (hereinafter referred to as a cell) 20a, 20b, 20c. A user equipment (UE) 10 may have mobility and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, a terminal, or the like. The base station 20 generally refers to a fixed station that communicates with the user terminal 10 and may be referred to by other terms such as an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, .

The user terminal 10 can receive control information from the base station 20 via a downlink and can transmit information to the base station 20 via an uplink.

The information transmitted or received by the user terminal 10 may include data and various control information, and various physical channels may exist depending on the type and use of the information transmitted or received by the user terminal 10. [

When the power of the user terminal 10 is turned off and the power is turned on again or the user terminal 10 enters a new cell, the user terminal 10 synchronizes with the base station 20, Can be performed. To this end, the user terminal 10 acquires synchronization between the base station 20 and the user terminal 10 using the synchronization channel from the base station 20, and obtains information such as the cell ID. Thereafter, the user terminal 10 may receive a physical broadcast channel from the base station to obtain broadcast information in the cell.

2 is a diagram illustrating an embodiment of an uplink channel.

Referring to FIG. 2, the uplink channel may include physical random access channel (PRACH), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), and physical uplink urgent data channel (PUUCH).

PRACH can transmit random access channel (RACH) information, which is used for a resource allocation request for uplink data transmission or connection with a base station, and transmits an initial control message.

The PUCCH may transmit uplink control information such as a hybrid automatic repeat request (ACK) acknowledgment (ACK) / non-acknowledge (HARQ) for a downlink transmission, a channel quality indicator (CQI)

The PUSCH can transmit information of a UL-SCH (uplink shared channel) that transmits user traffic or a control message other than the initial control message.

PUUCH is a channel defined for uplink data transmission requiring low delay, and can sequentially transmit a random access preamble and uplink data requiring low delay. On the other hand, since the PUUCH is merely a defined term in consideration of the function of the channel, it can be changed to another term.

3 is a flowchart illustrating an embodiment of an uplink data transmission method.

Referring to FIG. 3, the user terminal 10 may transmit the random access preamble allocated to the user terminal 10 to the base station 20 through the PUUCH (310). At this time, the random access preamble is allocated in advance to the user terminal 10 by the base station 20, and may serve as an identifier for distinguishing the user terminal 10 from other user terminals.

Since the PUUCH is as described above with reference to FIG. 2, a detailed description thereof will be omitted.

After transmitting the random access preamble to the base station 20, the user terminal 10 may repeatedly transmit uplink data to the base station 20 through a resource set corresponding to the random access preamble allocated to the user terminal 10 (320) .

In this case, the resource set may refer to a set of resources selected in a resource pool defined by the time and frequency on the PUUCH. At this time, the total number of resources in the resource pool can be adjusted according to the number of time axis resources and the number of frequency axis resources. For example, assuming that a total of three time-base resources are the first time slot, the second time slot, and the third time slot, and the frequency axis resources are three in the first frequency range, the second frequency range, and the third frequency range, A resource pool can contain a total of nine resources (3 * 3 = 9).

In addition, the number of time-base resources and / or the number of frequency-axis resources may be determined based on the number of user terminals connected to the base station 20 by the base station 20 or the like.

According to one embodiment, each resource set may correspond one-to-one with a random access preamble allocated to each user terminal. For example, a first resource set including resources 1, 3, and 5 corresponds to a first random access preamble, and a second resource set including resources 1, 2, and 4 corresponds to a second random access preamble .

In addition, the number of resources included in each resource set may be the same as the number of time-axis resources in the resource pool. However, the present invention is not limited thereto, and the number of resources included in each resource set may be different from the number of time-axis resources of the resource pool depending on the use and performance of the system. That is, the number of resources included in each resource set may be larger or smaller than the number of time resource resources of the resource pool.

The information on the resource set corresponding to the random access preamble allocated to the user terminal 10 may be acquired based on the pre-stored random access preamble-resource set relationship information of the user terminal 10 or may be acquired from the base station 20 by using the random access preamble And can be obtained by being assigned with. At this time, the random access preamble-resource set relation information may be information on a plurality of random access preamble managed by the base station 20 and a resource set corresponding to each preamble.

Accordingly, upon receiving the specific random access preamble, the base station 20 can identify the user terminal that transmitted the random access preamble in order to transmit the uplink data, and simultaneously know the resource set allocated to the identified user terminal have. Also, even if some resources overlap with other user terminals and data transmission conflicts with other user terminals, the same data is repeatedly transmitted many times, so that the probability of successfully transmitting data can be increased.

FIG. 4 is a diagram illustrating an uplink data transmission method of FIG. 3; FIG. 4 illustrates a case where three user terminals attempt to transmit uplink data using the PUUCH, in which a first resource group 440 is allocated to a first user terminal 410, a second resource group 440 is allocated to a second user terminal 420, Assume that the set 450 is allocated to the third user terminal 430 and the third resource set 460 is allocated to the third user terminal 430, respectively.

Referring to FIG. 4, the first user terminal 410, the second user terminal 420, and the third user terminal 430 transmit the random access preamble allocated to the first user terminal 410, the third user terminal 420, and the third user terminal 430 to the base station through the PUUCH. Thereafter, in the first time slot, the first user terminal 410 transmits the uplink data through the resource 1 and the resource 3, respectively, the second user terminal 420 transmits the uplink data through the resource 3, 3 user terminal 430 transmits uplink data through resource 1. Thus, the data transmission of the first user terminal 410 in the first timeslot conflicts with the data transmission of the second user terminal 420 and the third user terminal 430, respectively.

Thereafter, the second user terminal 420 transmits the uplink data through the resource 4 and the third user terminal 430 transmits the uplink data through the resource 5 in the second time slot. Therefore, the data transmission of the second user terminal 420 and the third user terminal 430 in the second time slot succeeds.

Then, in the third time slot, the first user terminal 410 transmits the uplink data through the resource 7, and the second user terminal 420 and the third user terminal 430 transmit the uplink data through the resource 8 Respectively. Thus, the data transmission of the first user terminal 410 is successful in the third time slot, but the data transmission of the second user terminal 420 and the third user terminal 430 is collided.

As a result, the first user terminal 410 transmits the third data through the resource 7, the second user terminal 420 transmits the second data through the resource 4, and the third user terminal 430 transmits the resource 5 The transmission of the uplink data is successful.

That is, according to the uplink data transmission method according to the embodiment, in the case of uplink data requiring low delay, it is possible to reduce the delay time of the uplink transmission by transmitting the uplink data immediately after transmitting the random access preamble. In addition, by repeatedly transmitting uplink data, it is possible to reduce the probability of transmission failure that may occur due to a data transmission collision with another user terminal.

5 is a flowchart showing another embodiment of the uplink data transmission method.

3 and 5, the uplink data transmission method of FIG. 5 includes a random access preamble allocation step 510, a random access preamble transmission time information transmission step 520, (Step 530), an uplink data transmission channel resource allocation step (step 540), and an uplink data retransmission step (step 540).

In the random access preamble allocation step 510, the base station 20 may assign a random access preamble to the user terminal 10 to identify the user terminal 10. [

In the random access preamble transmission time information transmission step 520, the base station 20 can transmit random access preamble transmission time information together with system information (e.g., SIB (system information block) to the user terminal 10).

In step 530, the base station 20 may determine whether the reception of the uplink data transmitted from the user terminal 10 has failed. The base station 20 can determine which resource has failed to transmit because the UE 20 can know which resource each UE has transmitted in case of failure in reception. The base station 20 may determine whether the user terminal 10 fails to transmit based on the determination.

In the step 540 of allocating the uplink data transmission channel resource, when the base station 20 determines that the reception of the uplink data transmitted from the user terminal 10 has failed, the base station 20 retransmits the uplink data that failed to be received from the user terminal 10 (340) the uplink data transmission channel resource (e.g., PUSCH resource) for the user terminal 10 to receive.

In the uplink data retransmission step 540, the user terminal 10 may retransmit the uplink data through the allocated uplink data transmission channel resource (350).

FIG. 6 is a diagram illustrating another method for transmitting uplink data in the case of uplink data transmission failure in FIG. 6 shows a case where three user terminals attempt to transmit uplink data using the PUUCH, in which a first resource group 640 is allocated to a first user terminal 610, a second resource 640 is allocated to a second user terminal 620, Assume that a set 650 is allocated to the third user terminal 630 and a third resource set 660 is allocated to the third user terminal 630, respectively.

6, the first user terminal 610, the second user terminal 620, and the third user terminal 630 transmit the random access preamble allocated to the first user terminal 610, the random access preamble, Lt; / RTI > At this time, the random access preamble transmission time point can be known from the base station system information (e.g., random access preamble transmission time point information received together with the SIB (system information block).

Thereafter, in the first time slot, the first user terminal 510 transmits the uplink data through the resource 1 and the resource 3 respectively, the second user terminal 520 transmits the uplink data through the resource 3, 3 user terminal 530 transmits uplink data through resource 1. Thus, in the first time slot, the data transmission of the first user terminal 510 collides with the data transmission of the second user terminal 520 and the third user terminal 530, respectively.

Thereafter, in the second time slot, the second user terminal 520 transmits the uplink data through the resource 4, and the third user terminal 530 transmits the uplink data through the resource 5. Thus, the data transmission of the second user terminal 520 and the third user terminal 530 succeeds in the second time slot.

Then, in the third time slot, the first user terminal 510 and the third user terminal 530 transmit the uplink data through the resource 7, respectively, and the second user terminal 520 transmits the uplink data . Thus, the data transmission of the second user terminal 520 in the third time slot succeeds, but the data transmission of the first user terminal 510 and the third user terminal 530 is collided.

As a result, the second user terminal 510 transmits the second data through the resource 4 and the third data through the resource 8, and the third user terminal 530 transmits the second data through the resource 5, Transmission is successful. However, all three data transmissions through resource 1, resource 3 and resource 7 of the first user terminal 510 all fail.

At this time, the base station recognizes the failed first user terminal 510 and quickly allocates the uplink data transmission channel resource (e.g., PUSCH resource) for retransmission of the unsuccessfully transmitted uplink data to the first user terminal 510 , The first user terminal 510 retransmits the uplink data failed to be transmitted to the base station through the uplink data transmission channel resource allocated from the base station.

7 is a detailed configuration diagram of a mobile communication system.

The user terminal 10 may include a control unit 11, a storage unit 12, and a communication unit 13. The storage unit 12 may store various information for the operation of the control unit 11 under the control of the control unit 11. The communication unit 13 can transmit data to the base station 20 or receive data from the base station 20 under the control of the control unit 11. [ The control unit 11 may implement the proposed functions, procedures and / or methods. That is, the operation of the user terminal in the above-described embodiment can be implemented by the control unit 11.

The base station 20 may include a control unit 21, a storage unit 22, and a communication unit 23. The storage unit 22 may store various information for the operation of the control unit 21 under the control of the control unit 21. [ The communication unit 13 can transmit data to the user terminal 10 or receive data from the user terminal 10 under the control of the control unit 21. [ The control unit 21 may implement the proposed functions, procedures and / or methods. That is, in the above-described embodiment, the operation of the base station can be implemented by the control unit 21. [

The control units 11 and 21 may include an application specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing apparatus. The storage units 12 and 22 may include read only memory (ROM) Random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.

One aspect of the present invention may be embodied as computer readable code on a computer readable recording medium. The code and code segments implementing the above program can be easily deduced by a computer programmer in the field. A computer-readable recording medium may include any type of recording device that stores data that can be read by a computer system. Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical disk, and the like. In addition, the computer-readable recording medium may be distributed to networked computer systems and written and executed in computer readable code in a distributed manner.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be construed to include various embodiments within the scope of the claims.

10: User terminal
20: Base station
11, 21:
12, 22:
13, 23:

Claims (16)

In an uplink data transmission method of a terminal,
Transmitting an allocated random access preamble to a base station; And
Repeatedly transmitting uplink data to the base station through a resource set corresponding to the allocated random access preamble after transmitting the allocated random access preamble to the base station; / RTI >
Uplink data transmission method. The method according to claim 1,
Wherein the allocated random access preamble includes:
A terminal for identifying the terminal,
Uplink data transmission method. delete The method according to claim 1,
Receiving the random access preamble from the base station; ≪ / RTI >
Uplink data transmission method. The method according to claim 1,
Receiving random access preamble transmission time information from the base station; ≪ / RTI >
Uplink data transmission method. 6. The method of claim 5,
Wherein the step of receiving the random access preamble transmission time information comprises:
Receiving the random access preamble transmission time information together with the system information,
Uplink data transmission method. The method according to claim 1,
Receiving a resource for retransmission from the BS when the uplink data fails to be transmitted; And
Retransmitting the uplink data to the base station through the allocated resources; ≪ / RTI >
Uplink data transmission method. 8. The method of claim 7,
Wherein the resource for the retransmission comprises:
The uplink data transmission channel resource,
Uplink data transmission method. A communication unit for transmitting data to the base station and receiving data from the base station;
The base station transmits the allocated random access preamble to the base station by controlling the communication unit and transmits the allocated random access preamble to the base station and then transmits the uplink data to the base station through a resource set corresponding to the allocated random access preamble A control unit for repeatedly transmitting data; / RTI >
Terminal. 10. The method of claim 9,
Wherein the allocated random access preamble includes:
A terminal for identifying the terminal,
Terminal. delete 10. The method of claim 9,
Wherein,
Receiving random access preamble transmission time information from the base station,
Terminal. 13. The method of claim 12,
Wherein,
Receiving the random access preamble transmission time information together with the system information,
Terminal. 10. The method of claim 9,
Wherein the communication unit receives resource allocation information for retransmission from the base station when the uplink data transmission fails,
Wherein the control unit controls the communication unit to retransmit the uplink data to the base station through the resources allocated thereto,
Terminal. 15. The method of claim 14,
Resources for retransmissions,
The uplink data transmission channel resource,
Terminal. In the uplink data transmission method,
Transmitting a random access preamble allocated to a terminal to a base station;
The UE repeatedly transmitting uplink data to the base station through a resource set corresponding to the allocated random access preamble after transmitting the allocated random access preamble to the base station;
Determining whether the BS has failed to receive uplink data transmitted from the MS;
Allocating an uplink data transmission channel resource to the terminal if the reception is determined to be unsuccessful; And
The UE retransmitting the uplink data failed to be received through the allocated uplink data transmission channel resource; / RTI >
Uplink data transmission method.
KR1020160011438A 2015-12-03 2016-01-29 Low latency uplink data transmission method and system KR101790232B1 (en)

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KR1020160011438A KR101790232B1 (en) 2016-01-29 2016-01-29 Low latency uplink data transmission method and system
US15/368,933 US10660133B2 (en) 2015-12-03 2016-12-05 Method and system for random access and uplink data transmission for low latency communication

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150359005A1 (en) 2013-01-28 2015-12-10 Alcatel Lucent Wireless telecommunications

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150359005A1 (en) 2013-01-28 2015-12-10 Alcatel Lucent Wireless telecommunications

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
노동석, 조동호, "저지연 통신을 위한 지정 대역 할당 및 비직교 다중 접속 방식," 한국통신학회 하계종합학술대회논문집, pp.880-881, 2016.06.(T)

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