KR20160058693A - Method for generating frame in low latency mobile communication system and apparatus thereof - Google Patents
Method for generating frame in low latency mobile communication system and apparatus thereof Download PDFInfo
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- KR20160058693A KR20160058693A KR1020150158965A KR20150158965A KR20160058693A KR 20160058693 A KR20160058693 A KR 20160058693A KR 1020150158965 A KR1020150158965 A KR 1020150158965A KR 20150158965 A KR20150158965 A KR 20150158965A KR 20160058693 A KR20160058693 A KR 20160058693A
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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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
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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
- H04L5/0078—Timing of allocation
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Abstract
A method and apparatus for frame generation in a low delay mobile communication system are provided. A frame in which some resources of a legacy system band, which is a frequency band supporting a legacy system, are allocated to a low delay region for a low delay service. And transmits information on the low-delay region.
Description
The present invention relates to a method and apparatus for generating frames in a low delay mobile communication system.
There is a legacy-zone support method as a legacy technology for supporting a legacy system in a new system in a mobile communication environment. Here, a legacy system represents a system already defined, and a legacy terminal represents a terminal supported by a legacy system. For example, in view of the 3GPP LTE-A system, the 3GPP LTE system corresponds to a legacy system.
In order to support a legacy system in a wireless communication system, a DL (downlink) zone is divided into a legacy zone, which is a region for supporting a legacy terminal through a time division multiplexing scheme, and a New Zone, which is a region for supporting a terminal of a new system There is a way to divide and separate.
In such a frame structure, time intervals for supporting legacy systems inevitably occur between newzones, thereby increasing the minimum access time in services for low latency. Also, basically, each system can access only the zones allocated to each system, making it difficult to meet dynamic service demands.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for constructing a frame for a low-delay service in a mobile communication system supporting a new service such as a low-delay service.
A frame generation method according to an aspect of the present invention is a method for generating a frame in a mobile communication system supporting a low delay service, in which a part of resources of a legacy system band, which is a frequency band supporting a legacy system, Generating a frame to be allocated to the area; And transmitting information on the low delay region.
The low-delay region has a short-TTI (Transmission Time Interval) structure, and may be allocated in units of subframes of the legacy system band.
In the short frames constituting the low delay region of the short-TTI structure, the last shot frame may be composed of a smaller number of symbols than the other shot frames.
Also, in the short frames constituting the low-delay region of the short-TTI structure, the first shot frame may be composed of a smaller number of symbols than the other shot frames.
The step of transmitting the information may include transmitting information on the low delay area through the control area of the legacy system band; And transmitting information on the low-delay region through an upper layer signal.
The step of transmitting the information on the low delay region through the control region may transmit the information on the low delay region through the downlink control information (DCI) of a PDCCH (Special Physical Downlink Control Channel) region.
The frame generation method may further include the step of allocating a part of the low delay area to a control area for transmission of control information of the low delay terminal.
The frame generation method may further include a step of including configuration information on the control area of the low delay area in the configuration information of the low delay area.
The frame generation method may further include: allocating a part of the low delay area as a data area for data transmission of the low delay terminal; And transmitting information on the data area through a control signal of a low delay area.
In addition, when the hybrid automatic repeat request (HARQ) feedback of the transport block transmitted through the data area is performed, if the resource for the HARQ procedure is insufficient in the low delay area, Or the HARQ feedback is performed through the data area.
According to the embodiment of the present invention, a frame having a short-TTI (Transmission Time Interval) for supporting a low-delay service can be configured in a mobile communication system supporting a low-delay service.
When one frequency band is available according to such a short-TTI frame structure, not only a service in a legacy system but also a low-delay service can be supported in one cell.
In addition, since the short-TTI region can be allocated using the resource allocation function of the legacy system, resources can be allocated considering the signal to interference noise ratio (SINR) of the low-delay terminals using a relatively small OFDM symbol, The quality of the delayed service can be improved.
1 is a diagram showing a frame structure of a legacy system.
2 is a diagram illustrating a frame structure of a mobile communication system supporting a low-latency service.
3 is a diagram illustrating a frame structure of a low-delay system according to an embodiment of the present invention.
4 is a diagram illustrating an example of a low delay region and a PDCCH region according to an embodiment of the present invention.
5 is a diagram illustrating another example of a low delay region and a PDCCH region according to an embodiment of the present invention.
6 and 7 are diagrams illustrating another example of a low-delay region and a PDCCH region according to an embodiment of the present invention.
8 is a diagram illustrating an example of allocating a short-TTI region for a low-delay system based on a legacy system band in an embodiment of the present invention.
FIG. 9 illustrates an exemplary downlink frame structure according to an exemplary embodiment of the present invention, and FIG. 10 illustrates an uplink frame structure according to an exemplary embodiment of the present invention. Referring to FIG.
11 is a diagram illustrating resource allocation for data transmission in a frame structure according to an embodiment of the present invention.
12 is a flowchart of a frame generation method according to an embodiment of the present invention.
13 is a diagram illustrating transmission of HARQ retransmission time in a system according to an embodiment of the present invention.
14 is a diagram illustrating HARQ feedback in a low-delay region according to an embodiment of the present invention.
15 is a structural diagram of a frame generating apparatus 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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. 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, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.
Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station (HR- A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) , HR-MS, SS, PSS, AT, UE, and the like.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and apparatus for generating frames in a low-delay mobile communication system according to an embodiment of the present invention will be described with reference to the drawings.
1 is a diagram showing a frame structure of a legacy system.
A frame of a legacy system (also referred to as a "legacy frame" for convenience of description) includes a plurality of subframes and has a normal transmission time interval (TTI) structure as shown in FIG. Each subframe constituting the TTI is composed of about 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols each consisting of, for example, two slots. Here, a legacy system represents a system that has already been defined.
2 is a diagram illustrating a frame structure of a mobile communication system supporting a low-latency service.
A system supporting a new service, for example, a mobile communication system supporting a low latency service (hereinafter referred to as a low delay system for convenience of explanation) , A frame of a short TTI structure is used. Each subframe constituting the TTI, that is, a short frame may be composed of, for example, at least about 100 us, and may be composed of one symbol. The TTI of a low delay system is, for example, 100us, a time shorter than 1/10 of a 1ms TTI of a legacy system (e.g., 3GPP LTE / LTE-A system).
The low-delay system uses an OFDM symbol such as a legacy system for interference prevention and minimum compatibility with a legacy system, and the number of OFDM symbols constituting the TTI can be determined by the time constraint of the TTI. For example, a TTI may be composed of one symbol. In addition to the 1-symbol TTI, the TTI may be composed of 2 to 7 symbols.
In the embodiment of the present invention, some resources in the band of the legacy system are allocated to the short-TTI structure for the low-delay service, and the terminal supporting the short-TTI operation and the low-delay service is supported.
3 is a diagram illustrating a frame structure of a low-delay system according to an embodiment of the present invention.
In the embodiment of the present invention, as shown in FIG. 3, a frequency band for a legacy system, that is, a legacy system band is performed in the entire system band, and some resources are used for a short-TTI structure for a low-delay service. That is, some of the resources are used as a short-TTI region (hereinafter, referred to as a low-delay region) for the low-delay system. Accordingly, some resources in the entire system band are allocated as data areas for legacy terminals supported by the legacy system, and some resources are allocated to data for a terminal requesting a low delay service (for convenience of explanation, a low delay terminal) Area. ≪ / RTI >
The size of a special physical downlink control channel (PDCCH) area, which is a control area for allocating a data area for legacy terminals, can be configured from a minimum of one OFDM symbol to a maximum of three OFDM symbols and is configured according to a configuration method in a legacy system . In order to maximize the time continuity of the interval for the low-delay service, a PDCCH region constituted by one OFDM symbol having the minimum length can be used.
4 is a diagram illustrating an example of a low delay region and a PDCCH region according to an embodiment of the present invention.
In a subframe consisting of 14 symbols in the legacy system band, a 1-symbol short-TTI for the low-delay region can be constructed, as in Fig. In this case, the PDCCH region of the legacy system may be composed of one symbol, two symbols, and three symbols, respectively. Specifically, the PDCCH region of the legacy system may be composed of one symbol (FIG. 4A), or the PDCCH region of the legacy system may be composed of two symbols (FIG. 4B) PDCCH region may be composed of three symbols (Fig. 4 (c)).
5 is a diagram illustrating another example of a low delay region and a PDCCH region according to an embodiment of the present invention.
The PDCCH region of the legacy system is composed of 1 symbol, 2 symbols, and 3 symbols, respectively, as described above, and the low-delay region can be configured as a 2-symbol short-TTI. In this case, a short-TTI configuration of 2 symbols may not be provided in accordance with a subframe composed of 14 symbols. Specifically, when the PDCCH region of the legacy system is composed of one symbol (FIG. 5A) or composed of three symbols (FIG. 5C) as in FIG. 5, do. These extra symbols can be called special short frames.
Special shot frames can be used for specific purposes such as data transmission or control signaling. The special shot frame is the last shot frame and has a smaller number of symbols than the other shot frames. Therefore, when used for data transmission, data transmission using fewer resources than short frames should be performed. Therefore, the special shot frame can be used for a terminal having a good channel environment, or for data transmission of a small size. In addition, the special shot frame may be used for transmission of HARQ (Hybrid Automatic Repeat Request) feedback, scheduling information, channel state information, or a sounding reference signal for channel state information.
6 is a diagram illustrating another example of the low delay region and the PDCCH region according to the embodiment of the present invention.
The PDCCH region of the legacy system is composed of 1 symbol, 2 symbols, and 3 symbols, respectively, as described above, and the low-delay region can be configured as a 3-symbol short-TTI. Even in this case, a short-TTI configuration of 3 symbols may not be provided for a subframe composed of 14 symbols. Specifically, as shown in FIG. 6, when the PDCCH region of the legacy system is composed of one symbol (FIG. 6A) or composed of three symbols (FIG. 6C), one symbol or two symbols There is a special shot frame that is extra.
7 is a diagram illustrating another example of a low delay region and a PDCCH region according to an embodiment of the present invention.
The PDCCH region of the legacy system may be composed of 1 symbol, 2 symbols, and 3 symbols, respectively, as described above, and the low-delay region may be configured as a slot-short-TTI of 7 symbols )). In this case, the first shot frame may be composed of fewer than seven symbols in order to align the slot boundaries of the legacy system (FIGS. 7B and 7C). Specifically, as shown in FIG. 7B, if the PDCCH region of the legacy system is composed of two symbols, the first short frame is composed of five symbols, and can form a slot unit resource configuration like the legacy system.
The short-TTI regions for the low-delay UE according to the embodiment of the present invention may be allocated in units of subframes of the legacy system, and may be configured in some frequency regions among the entire frequencies. Information on the short-TTI region may be provided through downlink control information (DCI) transmitted through the PDCCH.
8 is a diagram illustrating an example of allocating a short-TTI region for a low-delay system based on a legacy system band in an embodiment of the present invention.
The low delay region for low delay services can be located in various frequency resources of the legacy system band, as in Fig. The short-TTI resources constituting the low-delay region can be allocated in units of sub-frames of the legacy system band, and information on the location of the allocated short-TTI resources can be provided through the DCI transmitted through the PDCCH have. The base station can determine the optimal resource position by considering the channel information of the terminals accessing through the short-TTI.
In addition, in the embodiment of the present invention, in addition to the method of transmitting the information on the resources of the allocated low delay region through the PDCCH, the information of the low-delay region is transmitted through the upper layer signal (for example, radio resource control (RRC) , You can specify the location of the short-TTI resource. In this case, short-TTI resources may be constrained to change dynamically in short time units.
FIG. 9 illustrates an exemplary downlink frame structure according to an exemplary embodiment of the present invention, and FIG. 10 illustrates an uplink frame structure according to an exemplary embodiment of the present invention. Referring to FIG.
In a downlink (DL) frame, as illustrated in FIG. 9, in a frame based on a legacy system band, some resources are used as a low-delay region for a low-delay system to allocate short-TTI frames. Information on the allocated low-delay region, i.e., the short-TTI region, may be transmitted through the PDCCH region or through a higher layer signaling.
Also, in the uplink (UL) frame, as illustrated in FIG. 10, some resources of the legacy system band are used as a low-delay region, and data transmission or the like can be performed.
In this way, resource allocation for data transmission can be performed as shown in FIG. 11 in a frame structure in which a legacy system band and a low-delay region coexist.
11 is a diagram illustrating resource allocation for data transmission in a frame structure according to an embodiment of the present invention.
Some resources of the legacy system band are used as the low delay area, and the allocation of the legacy data area for the legacy terminals can be performed through the control area of the legacy system. As shown in FIG. 11, short-TTI frames of a low delay region are allocated to some resources, and some of these low delay regions are allocated to a data region for data transmission of the low-delay UE. And the information on the data area allocated for the low-delay UEs can be transmitted through the control signal of the low-delay area. To this end, a control channel for transmitting a control signal in a low delay region may be configured. The information for the control channel configuration in the low-delay area (or may be referred to as configuration information for the control area) may be referred to as control information (or configuration information for the low-delay area) for allocating the low- For example, DCI, or may be included in an upper layer signal.
Also, a terminal capable of receiving a control signal of a low-delay region can perform data transmission through a region of the legacy system. In this case, the data area of the legacy system can be allocated through the control signal of the low delay area. That is, as shown in FIG. 11, information on a data area allocated for legacy terminals can be transmitted through short-TTI control signaling.
Conversely, a data area allocation operation of a low delay area through the control area of the legacy system is also possible. In this case, the resource allocation message transmitted in the control region in the legacy system includes not only the frequency resource position of the low-delay region but also a TTI index indicating the number of short frames. If the resource allocation for the data area is possible only in the first TTI among the TTIs of the low delay region through the control region of the legacy system, the resource allocation message may not include the TTI index.
12 is a flowchart of a frame transmission method according to an embodiment of the present invention.
In a mobile communication system supporting a new service such as a low-delay service, a base station generates a frame for a low-delay service. Specifically, as shown in FIG. 12, in a legacy system band that is a frequency band supporting a legacy system, a frame is generated by allocating some resources to a region for supporting a low-delay service, that is, a low-delay region. The low-delay region has a short-TTI structure. Information on the low-delay region may be transmitted through the control region of the legacy system band or may be transmitted through the upper layer signal (S110).
In this manner, a frame in which the legacy system band and the low-delay region coexist is generated and a part of the low-delay region is allocated as a data region for data transmission in the low-delay terminal (S120). The information on the data area allocated for the low-delay UEs is transmitted through the control signal of the low-delay area or the control signal of the legacy area (S130).
Meanwhile, in the coexistence system in which the low-delay system and the legacy system coexist according to the embodiment of the present invention, the HARQ procedure follows the HARQ procedure defined in the legacy system.
13 is a diagram illustrating transmission of HARQ retransmission time in a system according to an embodiment of the present invention.
The HARQ procedure for HARQ feedback and retransmission of a transport block (TB) performed in a band of a legacy system follows an HARQ procedure defined in a legacy system.
Similarly, the HARQ procedure of the transport block performed in the low-delay region, which is the short-TTI region, follows the HARQ procedure in the low-delay region. In addition, the HARQ procedure of data transmission in the data area of the legacy system follows the HARQ procedure defined in the legacy system.
If there is insufficient resources for performing the HARQ procedure in the low-delay region, or if there is no channel for HARQ feedback in the low-delay region, feedback can be performed using the HARQ feedback channel in the legacy region. In addition, in the case of a service that does not require fast retransmission in the low delay region, the HARQ operation can be performed through feedback using the HARQ feedback channel of the legacy region.
14 is a diagram illustrating HARQ feedback in a low-delay region according to an embodiment of the present invention.
Data transmission of a predetermined service is performed through a data area of a low delay area and HARQ of data transmission is performed in accordance with an HARQ procedure in a low delay area. In this case, when there is no resource for HARQ procedure in the low delay region, as shown in FIG. 14, the HARQ feedback of the data transmission block may be performed through the control region or the data region of the UL frame of the legacy system have. Such integrated feedback may be a service that does not require fast retransmission, for example, a voice of Internet Protocol (VoIP) service or a file transfer service.
15 is a structural diagram of a frame generating apparatus according to an embodiment of the present invention.
15, the frame generating apparatus 100 according to the embodiment of the present invention includes a
To this end, the
The frame
The information
The
The
The
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, a recording medium on which the program is recorded And such an embodiment can be easily 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 (10)
Generating a frame in which some resources of a legacy system band, which is a frequency band supporting a legacy system, are allocated to a low-delay region for a low-delay service; And
Transmitting information on the low-delay region
≪ / RTI >
Wherein the low delay region has a short-TTI (Transmission Time Interval) structure, and is allocated in units of subframes of the legacy system band.
Wherein the last shot frame is composed of a smaller number of symbols than the other shot frames in the short frames constituting the low delay region of the short-TTI structure.
Wherein the first shot frame is composed of a smaller number of symbols than the other shot frames in the short frames constituting the low delay region of the short-TTI structure.
Wherein the step of transmitting the information comprises:
Transmitting information on the low delay region through a control region of the legacy system band; And
Transmitting information on the low-delay region through an upper layer signal
/ RTI > wherein the at least one frame comprises at least one of < RTI ID =
Wherein the step of transmitting information on the low-delay region through the control region transmits information on the low-delay region through downlink control information (DCI) of a special physical downlink control channel (PDCCH) region.
Allocating a part of the low-delay area as a control area for transmitting control information of the low-delay terminal
≪ / RTI >
The step of including configuration information on the control area of the low delay area in the configuration information of the low delay area
≪ / RTI >
Allocating a part of the low delay area as a data area for data transmission of a low delay terminal; And
Transmitting information on the data area through a control signal of a low delay area
≪ / RTI >
When performing a Hybrid Automatic Repeat Request (HARQ) feedback of a transmission block transmitted through the data area, if there is insufficient resources for performing an HARQ procedure in a low delay region, HARQ feedback is performed through a control region or a data region of the legacy system band Steps to be performed
≪ / RTI >
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/940,642 US20160143030A1 (en) | 2014-11-14 | 2015-11-13 | Method of transmitting frame for supporting legacy system, and method and apparatus of searching cell using the same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20140159192 | 2014-11-14 | ||
| KR1020140159192 | 2014-11-14 |
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| KR20160058693A true KR20160058693A (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020150158965A KR20160058693A (en) | 2014-11-14 | 2015-11-12 | Method for generating frame in low latency mobile communication system and apparatus thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028454A (en) * | 2016-07-06 | 2016-10-12 | 珠海市魅族科技有限公司 | Resource allocation indicating method and device and base station |
| KR20190040332A (en) * | 2016-09-29 | 2019-04-17 | 후지쯔 가부시끼가이샤 | Base station apparatus, terminal apparatus and transmission method |
| CN114124639A (en) * | 2016-07-07 | 2022-03-01 | 弗劳恩霍夫应用研究促进协会 | Data transmission in a wireless communication system with reduced delay |
-
2015
- 2015-11-12 KR KR1020150158965A patent/KR20160058693A/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028454A (en) * | 2016-07-06 | 2016-10-12 | 珠海市魅族科技有限公司 | Resource allocation indicating method and device and base station |
| CN106028454B (en) * | 2016-07-06 | 2019-02-22 | 珠海市魅族科技有限公司 | Resource allocation indicating method and device, base station |
| CN114124639A (en) * | 2016-07-07 | 2022-03-01 | 弗劳恩霍夫应用研究促进协会 | Data transmission in a wireless communication system with reduced delay |
| KR20190040332A (en) * | 2016-09-29 | 2019-04-17 | 후지쯔 가부시끼가이샤 | Base station apparatus, terminal apparatus and transmission method |
| EP3522650A4 (en) * | 2016-09-29 | 2020-05-27 | Fujitsu Limited | Base station device, terminal device, and transmission method |
| US10750524B2 (en) | 2016-09-29 | 2020-08-18 | Fujitsu Limited | Base station device, terminal device, and transmission method |
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