METHOD AND APPARATUS FOR TRANSMITTING INFORMATION IN LOW LATENCY MOBILE COMMUNICATION SYSTEM

• US 20160143008A1
• Filed: 11/13/2015
• Published: 05/19/2016
• Est. Priority Date: 11/14/2014
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: LEE, Anseok, CHANG, Sung Cheol, JUNG, Soojung, CHO, Seungkwon
• Granted Patent: US 10,070,429 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

Disclosed are a method and apparatus for transmitting information in a low latency mobile communication system. Delay time requests are obtained from terminals, and time intervals for transmitting control information for the respective terminals are determined on the basis of the delay time requests. Control information is transmitted to the respective terminals according to the determined time intervals.

Claims

1. A method for transmitting information in a mobile communication system providing a low latency service, the method comprising:

obtaining delay time requests from terminals;

determining time intervals for transmitting control information by terminals on the basis of the delay time requests from the respective terminals; and

transmitting control information to the respective terminals according to the determined time intervals.

2. The method of claim 1, wherein

in the determining of the time intervals, control regions for transmitting control information for the respective terminals are configured on the basis of the delay time requests, and

the determining of the time intervals comprises:

setting intervals on the basis of set values according to the delay time requests;

determining offsets of the respective terminals;

obtaining frame numbers on the basis of the intervals and the offsets; and

configuring control regions by shortframes respectively corresponding to the obtained frame numbers.

3. The method of claim 2, wherein

in the obtaining of the frame numbers, frame numbers satisfying a condition of (SN % interval)==offset are obtained, wherein SN denotes a shortframe number.

4. The method of claim 2, wherein

the intervals are calculated in units of shortframe by the set value, and the shortframe represents a subframe for forming a transmission time interval (TTI) shorter than an existing TTI, and

in the setting of the intervals,

a transmission delay time required for transmitting transmission data is set to be smaller than or equal to a time duration corresponding to the delay time requests, and the transmission delay time is varied according to the intervals and the number of TTIs used in the transmission data.

5. The method of claim 2, wherein

the determining of the time intervals comprises configuring intervals and offsets on the basis of delay time requests previously set according to terminal types.

6. The method of claim 1, wherein

the transmitting of the control information further comprises:

transmitting a resource allocation message including a start field indicating a position of resource in which data transmission is performed.

7. The method of claim 1, further comprising:

adding an indicator in control information of a shortframe positioned ahead of a set shortframe such that a certain terminal does not receive control information in the set shortframe formed as a certain one shortframe or continued shortframes; and

transmitting the control information having the added indicator in the shortframe positioned ahead.

8. The method of claim 7, wherein

in the adding of the indicator, when there is no control information to be transmitted to a certain terminal in n-th shortframe, the indicator is added to control information of (n-1)-th shortframe, and

in the transmitting, the indicator-added control information is transmitted in the (n-1)-th shortframe.

9. The method of claim 8, wherein

in the adding of the indicator, when the terminals are classified into groups and there is no control information to be transmitted to n-th shortframe with respect to all the terminals of a certain terminal group, the indicator is added.

10. An apparatus for transmitting information in a mobile communication system providing a low latency service, the apparatus comprising:

a radio frequency (RF) converter configured to transmit and receive a signal through an antenna; and

a processor connected to the RF converter and configured to transmit control information,

wherein the process comprises;

a request obtaining processor configured to obtain delay time requests from terminals;

a control region configuring processor configured to configure control regions for transmitting control information of the respective terminals on the basis of the delay time requests from the terminals; and

a control information transmission processor configured to transmit control information to the terminals through the control regions.

11. The apparatus of claim 10, wherein:

the control region configuring processor configures the control regions with shortframes corresponding to frame numbers obtained on the basis of offsets of the terminals and intervals set on the basis of preset values according to the delay time requests.

12. The apparatus of claim 11, wherein

the intervals are calculated in units of shortframe by the preset values, the shortframes represent subframes constituting a transmission time interval (TTI) shorter than an existing TTI, and a transmission delay time required for transmitting transmission data is varied according to the intervals and the number of TTIs of the transmission data.

13. The apparatus of claim 11, wherein

the control information transmission processor transmits a resource allocation message including a start field indicating a position of resource in which data transmission is performed.

14. The apparatus of claim 10, further comprising:

a non-reception notification processor configured to, when there is no control information to be transmitted to a certain terminal in n-th shortframe, add an indicator indicating the corresponding information to control information of (n-1)-th shortframe and transmit the indicator-added control information.

15. The apparatus of claim 14, wherein

when the terminals are classified into groups and there is no control information to be transmitted in n-th shortframe with respect to all the terminals of a certain terminal group, the non-reception notification processor adds the indicator to the control information and transmits the indicator-added control information.

16. A method for transmitting resource allocation information in a mobile communication system providing a low latency service, the method comprising:

checking a size of transmission time intervals (TTIs) used for data transmission;

setting a resource allocation unit inverse proportionally according to the size of the TTIs;

performing resource allocation according to the resource allocation unit; and

generating resource allocation information according to the resource allocation and transmitting the generated resource allocation information.

17. The method of claim 16, wherein

in the setting of the resource allocation unit, a size of short radio resource blocks (sRBGs) expressed by 1 bit is set inverse proportionally according to the size of the TTIs.

18. The method of claim 17, wherein

the setting of the resource allocation unit comprises:

setting a size of sRBGs inverse proportionally according to the size of the TTIs, as a resource partitioning type 1 of a first set value; and

setting a size of the sRBGs inverse proportionally according to the size of the TTIs, as a resource partitioning type 2 of a second set value,

wherein a relationship of the first preset value×

2=the second preset value is satisfied.

19. The method of claim 18, wherein

the transmitting of the resource allocation information comprises:

transmitting information regarding the resource partitioning type 1 or the resource partitioning type 2 according to the sizes of the sRBGs through downlink control information (DCI).

20. The method of claim 18, wherein

the generating and transmitting of the resource allocation information further comprises:

transmitting information regarding the resource partitioning type 1 or the resource partitioning type 2 according to the sizes of the sRBGs through system information,

wherein when a size of the sRBGs is set to the resource partitioning type 1, in the performing of resource allocation, resource allocation is performed in a block form in units of resource block (RB), and in the generating of the resource allocation information, resource allocation information including a start RB and a length of allocated resource and the length is expressed by a value in an exponential form, and

when the size of the sRBGs is set to a resource partitioning type 2, in the performing of resource allocation, resource allocation is performed in a block form in units of resource group block (RGB), and in the generating of the resource allocation information, resource allocation information including a start RGB and a length of allocated resource and the length is expressed by a value in an exponential form.