Method and apparatus for transmitting information in low latency mobile communication system

• US 10,070,429 B2
• Filed: 11/13/2015
• Issued: 09/04/2018
• 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
• Primary Examiner(s): Kassim, Khaled
• Application Number:
  US14/941,536
• Publication Number:
  US 20160143008A1
• Time in Patent Office: 1,026 Days
• 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, by a base station, delay time requirements of terminals, wherein the delay time requirements represent required delay times of data packets according to characteristics of services provided to each of the terminals;

determining, by the base station, time intervals for transmitting control information for respective terminals based on the obtained delay time requirements for the respective terminals;

determining, by the base station, offsets of the respective terminals;

transmitting, by the base station, control information to the respective terminals through control regions, wherein the control information includes the time intervals and the offsets,

wherein the control regions for transmitting control information for the respective terminals are configured based on the time intervals and the offsets for the respective terminals;

before the transmitting of control information, obtaining frame numbers based on the time intervals and the offsets; and

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

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.

2. The method of claim 1, wherein the intervals are calculated in units of shortframe by the set values, and a shortframe represents a subframe for forming a transmission time interval (TTI) shorter than an existing TTI, and

Wherein 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 requirements, and the transmission delay time is varied according to the intervals and a number of TTIs used in the transmission data.

3. The method of claim 1, wherein the determining of the time intervals comprises configuring the intervals and offsets based on delay time requirements previously set according to terminal types.

4. 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 a resource in which data transmission is performed.

5. The method of claim 1, further comprising:

adding, by the base station, 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, by the base station, the control information having the added indicator in the shortframe positioned ahead.

6. The method of claim 5, wherein

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

1)-th shortframe, and

in the transmitting, the control information having the added indicator is transmitted in the (n−

1)-th shortframe.

7. The method of claim 6, wherein

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

8. The method of claim 1, wherein a terminal performs decoding in a control region corresponding to the determined time intervals and the offsets which are transmitted from the base station and does not perform decoding in control regions except for the control region.

9. 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 processor comprises;

a request obtaining processor configured to obtain delay time requirements of terminals, wherein the delay time requirements represent required delay times of data packets according to characteristics of services provided to each of the terminals;

a control region configuring processor configured to determine time intervals for transmitting control information for respective terminals based on the obtained delay time requirements, determine offsets of the respective terminals, and configure control regions for transmitting control information of the respective terminals based on the time intervals and the offsets; and

a control information transmission processor configured to;

transmit control information to the terminals through the control regions, wherein the control information includes the time intervals and the offsets,

before the transmitting of control information, obtain frame numbers based on the time intervals and the offsets, and

configure the control regions by shortframes respectively corresponding to the obtained frame numbers,

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.

10. The apparatus of claim 9, 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 a number of TTIs of the transmission data.

11. The apparatus of claim 9, wherein

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

12. The apparatus of claim 9, further comprising:

a non-reception notification processor configured to, when there is no control information to be transmitted to a certain terminal in an n-th shortframe, add an indicator indicating corresponding information to control information of an (n−

1)-th shortframe and transmit the indicator-added control information.

13. The apparatus of claim 12, wherein

when the terminals are classified into groups and there is no control information to be transmitted in the 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.