KR20170021816A - Method for performing hybrid automatic repeat request operation in wireless mobile communication system - Google Patents

Abstract

Disclosed are a method and an apparatus for a hybrid automatic repetition request (HARQ) operation in a wireless mobile communication system using frames, which use a frequency division duplex (FDD) method or a time division duplex (TDD) method including a plurality of sub-frames for communication. The method comprises the steps of: determining HARQ timing including a transmission time of a data burst and a transmission time of an HARQ feedback, for DL HARQ according to data burst allocation information transmitted within an l^th downlink (DL) sub-frame of an i^th frame: and performing an HARQ operation in accordance with the determined HARQ timing. At least one frame index and at least one sub-frame index indicative of the HARQ timing are determined by using i and l.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hybrid automatic repeat request (HARQ)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless mobile communication system, and more particularly, to a method for performing a Hybrid Automatic Repeat Request (HARQ) operation in a wireless mobile communication system.

Background of the Invention [0002] Wireless mobile communication systems are evolving to provide various services such as broadcasting, multimedia images, and multimedia messages to users. In particular, a next generation wireless mobile communication system is being developed to provide data services of 100 Mbps or more to users moving at high speeds and data services of 1 Gbps or more to users moving at low speeds.

In a wireless mobile communication system, a reduction in control overhead and a short latency are required for a base station (BS) and a mobile station (MS) to transmit and receive reliable data at high speed. A Hybrid Automatic Repeat reQuest (HARQ) scheme may be considered as a method for reducing the control overhead and supporting short latency.

In a wireless mobile communication system using an HARQ scheme, when a transmitter transmits a signal including data, the receiver transmits an acknowledgment (ACK) or a negative acknowledgment (NACK) indicating whether the data is normally received to the transmitter . The transmitting end initially transmits new data according to the receipt of ACK or NACK, or retransmits the previously transmitted data according to the HARQ scheme. Here, the HARQ scheme is a chase combining (CC) scheme or an incremental redundancy scheme (IR) scheme.

The conventional HARQ scheme can not satisfy the short latency because the transmission and reception operations are performed frame by frame. Therefore, a new frame structure for signal transmission and reception satisfying a shorter latency and a HARQ operation timing structure according to a new frame structure are required.

The present invention provides a method for controlling an HARQ operation in a wireless mobile communication system.

The present invention provides a method for determining a timing for transmission of a data burst, transmission and retransmission of an HARQ feedback signal in a wireless mobile communication system.

The present invention provides a method for flexibly determining HARQ operation timing according to a length of a data burst transmission interval and a system capability in a wireless mobile communication system.

A first method according to a preferred embodiment of the present invention comprises: A hybrid automatic repeat request (HARQ) operation method in a wireless mobile communication system using frames each composed of a plurality of subframes according to a frequency division multiplexing (FDD) scheme,

determining HARQ timing including transmission times of a DL data burst and a HARQ feedback for DL HARQ transmission corresponding to data burst allocation information in an 1 < st > downlink (DL) subframe of an i & And performing a HARQ operation according to the timing. Wherein at least one frame index indicating the HARQ timing and at least one subframe index are determined by using the i and l .

A method according to another embodiment of the present invention is a hybrid automatic repeat request (HARQ) operation method in a wireless mobile communication system in which frames each composed of a plurality of subframes are used for communication,

corresponding to the l th downlink (DL) data burst allocation information in the sub-frame of the i-th frame, the uplink (UL) includes a retransmission time of UL data burst and the data burst and the transmission time of the HARQ feedback for the HARQ transmission Determining a HARQ timing for the HARQ process, and performing an HARQ operation according to the determined HARQ timing. Wherein at least one frame index indicating the HARQ timing and at least one subframe index are determined by using the i and l .

The present invention can flexibly configure HARQ operation timings in a wireless mobile communication system, thereby providing a frame configuration method different from system bandwidth, various ratios of downlink (DL) and uplink (UL), support of legacy systems It is possible to flexibly perform HARQ transmission according to a scheme. It can also support synchronized relationships between DL and UL.

As described above, the synchronized relationship can reduce the number of subframes to be monitored by the receiving end, thereby minimizing power waste. In addition, by using the predefined operation timing, there is an advantage that the terminal has a high degree of freedom for performing communication with other systems.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an example of a superframe structure of an FDD scheme according to a preferred embodiment of the present invention. Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a TDD mode superframe structure.
3 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in an FDD scheme according to an embodiment of the present invention.
4 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission in an FDD scheme according to an embodiment of the present invention;
5 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in TDD mode according to an embodiment of the present invention.
6 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission in a TDD mode according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating a HARQ operation timing structure according to a DL data burst transmission in a TDD mode in a mode in which two systems coexist according to an embodiment of the present invention; FIG.
8 is a diagram illustrating a HARQ operation timing structure according to a UL data burst transmission in a TDD mode in a mode in which two systems coexist according to an embodiment of the present invention.
9 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in an FDD scheme according to another embodiment of the present invention.
10 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in a TDD mode according to another embodiment of the present invention.
11A and 11B, 12A and 12B, and 13A and 13B illustrate HARQ operation timing structures according to ratios of DL and UL.
FIG. 14 is a diagram illustrating a frame structure of a wireless mobile communication system supporting a repeater according to a preferred embodiment of the present invention. FIG.
15A and 15B are diagrams illustrating an example of a frame structure of a relay station in a TDD mode according to an embodiment of the present invention.
16A and 16B illustrate a HARQ operation timing structure for an odd-hop RS according to an embodiment of the present invention.
FIG. 17 is a diagram illustrating a HARQ operation timing structure for an even-numbered relay station according to an embodiment of the present invention; FIG.
FIG. 18 and FIG. 19 are flowcharts illustrating an operation flow between a base station and a terminal for DL and UL HARQ timing structures, respectively, according to a preferred embodiment of the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation of the present invention are described, and other background techniques are omitted so as not to disturb the gist of the present invention.

In this specification, a frequency division duplex (FDD) mode, a time division duplex (TDD) scheme, a half duplex FDD (H-FDD) (HARQ) retransmission delay time in a wireless mobile communication system to which the FDD mode and the TDD mode are applied. The frame structure used in the wireless mobile communication system to which the TDD mode or the H-FDD mode is applied may have various resource occupancy ratios between the downlink section and the uplink section. That is, the corresponding relationship between the uplink and the downlink may have a symmetric or asymmetric form.

Hereinafter, an operation of transmitting and receiving a signal between a base station (BS) and a mobile station (MS) according to a HARQ scheme based on a super frame structure will be described. Each superframe includes at least one frame, and each frame includes at least one or more subframes. A time slot has the same meaning as the subframe. Each time slot or each subframe includes at least one Orthogonal Frequency Division Multiple Access (OFDMA) symbol.

In one embodiment, each of the BS and the MS generates and analyzes data burst allocation information, and includes a controller for determining a time to perform HARQ transmission according to a frame structure and a HARQ operation timing to be described later, At least one HARQ processor for generating and analyzing data bursts and HARQ feedback, and a transceiver for transmitting and receiving the data burst allocation information, the data burst and the HARQ feedback. As an example, the data burst allocation information may be transmitted in the form of an Advanced MAP (A-MAP) information element (IE) indicating resource allocation, and a data burst may be transmitted in a HARQ sub- And can be transmitted in the form of a packet (Subpacket).

1 is a diagram illustrating an example of a superframe structure of an FDD scheme according to a preferred embodiment of the present invention.

Referring to FIG. 1, a superframe 100 is composed of four frames, and each frame 110 is composed of eight subframes. In the case of the FDD scheme, a downlink (DL) subframe 120 used for transmission from a base station to a mobile station and an uplink (UL) subframe 130 used for transmission from a mobile station to a base station are They operate in different frequency bands.

2 is a diagram illustrating an example of a frame structure of a TDD mode according to a preferred embodiment of the present invention.

Referring to FIG. 2, the superframe 200 is composed of four frames, and each frame 210 is composed of eight subframes. In the TDD mode, a certain number of subframes in each frame 210 are operated as DL subframes, and the remaining number of subframes are operated as UL subframes. In FIG. 2, DL: UL = 5: 3 is shown, which shows five DL subframes within a DL interval and three UL subframes within an UL interval. Transmit / receive transition gap (TTG) exists between the DL subframe and the following UL subframe, and there is a receive / transmit transition gap (RTG) between the UL subframe and the following DL subframe.

Although FIGS. 1 and 2 illustrate and illustrate the case where each superframe is composed of four frames and each frame is composed of eight subframes, the number N of the frames and the number F of subframes, May have different values depending on the bandwidth and the subcarrier spacing of the wireless mobile communication system. For example, in an OFDM (Orthogonal Frequency Division Multiplexing) / OFDMA wireless mobile communication system having channel bandwidths of 5, 10, and 20 MHz, the number of subframes per frame may be eight. In the OFDM / OFDMA wireless mobile communication system having a channel bandwidth of 8.75 MHz, the number of subframes per frame is 7, and in the OFDM / OFDMA wireless mobile communication system having a channel bandwidth of 7 MHz, The number of subframes per frame may be six. In addition, for one BW, the number of subframes can be varied according to the CP length.

In the HARQ scheme, the timing of the initial transmission and the retransmission timing may have a constant correspondence relationship, and this correspondence is referred to as an HARQ operation timing structure or an HARQ interlace. The HARQ operation timing structure or the HARQ interlace includes a relation between a subframe in which a MAP message including resource allocation information (i.e., control information) is provided and a corresponding subframe in which a signal is transmitted, And the subframe in which the feedback corresponding thereto is transmitted and the relation between the subframe in which the feedback is transmitted and the data corresponding thereto are the initial transmission or retransmission of the subframe. This will be described again.

(1) Data burst allocation information (assignment IE (Information Element): indicates assignment of DL data bursts or UL data bursts and is provided through DL subframes.

(2) Data Burst: The transmitting end transmits the data burst using the allocated resources according to the data burst allocation information.

(3) HARQ Feedback for Data Burst Transmission: The receiving end transmits an acknowledgment (ACK) or negative acknowledgment (NACK) according to whether the data burst is error-detected.

(4) Initial transmission or retransmission of a data burst according to HARQ feedback: The transmitting terminal retransmits a data burst when the HARQ feedback is NACK. At this time, allocation information for retransmission may be additionally provided. On the other hand, if the HARQ feedback is ACK, a new data burst can be initially transmitted.

The HARQ scheme can be classified into asynchronous HARQ (asynchronous HARQ) and synchronous HARQ (synchronous HARQ). In the case of asynchronous HARQ, the definition of the HARQ operation timing structure for (1) to (3) is required, and in the case of synchronous HARQ, definition of the HARQ operation timing structure for (1) to (4) is required. In order to define the HARQ operation timing, a certain correspondence is required between at least one subframe in the DL interval and at least one subframe in the UL interval.

Hereinafter, HARQ operation timing in the FDD communication mode and the TDD communication mode will be described in detail.

3 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission of the FDD scheme according to an embodiment of the present invention. As shown, the FDD frame structure of FIG. 1 will be referred to. Assuming that F = 8 and N = 4 and the transmission and reception processing time Tx / Rx for the data burst are 3 sub-frames, the DL HARQ feedback offset z = 0 and the DL HARQ transmission offset u) = 0. Here, the transmission processing time refers to the time required from the transmitting end to receiving the HARQ feedback and the next data to be transmitted. The receiving processing time refers to the time required for the receiving end to send the HARQ feedback after receiving the data.

Referring to FIG. 3, a transmitter transmits data burst allocation information and a DL data burst in a DL frequency band in a DL subframe 300 of an i-th frame. 310 to transmit HARQ feedback over the UL frequency band. The retransmission of the data burst according to the HARQ feedback is performed in the DL subframe 320 of the (i + 1) th frame by the transmitting end, and the feedback of the data burst is performed in the DL subframe 330 of the .

Referring to Table 1, the subframe index n at which the HARQ feedback is transmitted is determined as {ceil (1 + 4) mod 8} = 5, and the frame index j The frame index k to which the HARQ data burst is retransmitted is determined as {j + floor ((5 + 4) / 8) + i} 0} mod 4 = i + 1. The ceil function rounds the value to the right of the decimal point. The Floor function rounds down the fractional value of the computed value.

Table 1 below shows an embodiment of the DL HARQ operation timing structure of the FDD scheme. The following table shows transmission time points of at least one of an allocated A-MAP IE including data burst allocation information, an HARQ subpacket including a data burst, HARQ feedback including ACK and / or NACK, and HARQ retransmission subpacket And it is needless to say that the present invention is not limited by the following table.

In Table 1, N denotes the number of frames constituting one superframe. In the case where each superframe consists of four frames, 4 denotes F, and F denotes the number of subframes constituting one frame . For example, N = 4 and F = 8 in the 5/10/20 MHz bandwidth. And i, j, and k denote a DL frame index or an UL frame index, l denotes an index of a DL subframe in which data burst allocation information is provided, m denotes an index of a DL subframe , And n denotes an index of a UL subframe in which HARQ feedback for transmission of a data burst is transmitted. Also, z denotes a DL HARQ feedback offset, and u denotes a DL HARQ transmission offset (DL HARQ Tx offset). Where z and u are frame units. Thus, i = 0,1, ..., N -1, j = 0,1, ..., N-1, l = 0, N A-MAP, ..., N A-MAP (ceil ( _{F / n A-MAP) -1} ), n = 0,1, ..., F-1, m = 0,1, ..., F-1, z = 0,1, ..., z _max -1, and u = 0,1, ..., u _max -1.

N _A-MAP means a period of a subframe unit in which data burst allocation information is provided. The data burst allocation information is communicated through a conventional MAP message or an Advanced MAP message used in an improved system. N _A-MAP = 1 when data burst allocation information is provided every DL subframe, and N _A-MAP = 2 when data burst allocation information is provided between two DL subframe intervals. When N _A-MAP = 2, l = 0,2, ..., 2 (ceil (F / 2) -1).

F = 8, N = 4, z = 0, and u = 0 in the DL HARQ transmission and reception of the FDD scheme shown in FIG. i times assigned DL data burst is provided by the time l DL subframe 300 of the frame information indicates the time DL subframe m the i-th frame. When data burst allocation information is provided for each DL subframe (i.e., N _A-MAP = 1), the data burst allocation information provided in each DL subframe indicates a data burst transmission in which transmission starts in the corresponding DL subframe. That is, m becomes 'l'. On the other hand, if two DL subframes each being provided with a data burst allocation information (i.e., _{N A-MAP = 2),} l number of data burst allocation information provided from the sub-frame number is l DL sub-frame and the l +1 times the sub And indicates the transmission of the data burst in which transmission starts in the frame. That is, m indicates one of 'l' and 'l + 1', and relevance information indicating this is indicated through data burst allocation information.

The data burst indicated by the data burst allocation information may be transmitted through one or more subframes, and the length of a transmission time interval (TTI) of a data burst starting transmission in an m-th DL subframe may be N _TTI Quot; That is, N _TTI means the number of subframes occupied by the data burst. For example, information on N _TTI may be predetermined or indicated by data burst allocation information. N _TTI = 1 when the data burst occupies one subframe and N _TTI = 4 when occupying four subframes.

The HARQ feedback for the data burst transmitted in the m DL subframe of the i-th frame is transmitted in the n-th UL sub-frame of the j-th frame. Here, n is determined according to the following Equation (1) by the subframe index m at which the data burst is transmitted.

And the UL frame index j is determined by the subframe index m and the frame index i at which the data burst is transmitted. At this time, a frame offset is generated by a time interval between the time when the transmission of the data burst ends and the time when the HARQ feedback is transmitted. Here, the time interval is defined as Gap1 and is defined by Equation (2) below.

Where N _TTI is the length of the data burst transmission interval (in subframe units) according to the DL HARQ operation, and F is the number of subframes constituting each frame. In the FDD system, since each link interval is continuous, Gap1 is determined by the DL burst transmission interval and the number of subframes in the frame regardless of the subframe index.

In the DL HARQ, the value of the DL HARQ feedback offset z is determined so that Gap1 in Equation (2) is not smaller than the reception processing time (i.e., greater than or equal to). For example, z = 0 if Gap1 is not less than the receive processing time, and z = 1 if Gap1 is less than the receive processing time. Here, the z value is adjusted such that the HARQ feedback is transmitted in the same subframe index of the delayed frame. That is, the z value means an offset in frame units and does not mean a change in the subframe index.

If the determined z is taken into consideration, then j becomes Equation (3).

When retransmitting the DL data burst according to the asynchronous HARQ, the retransmission time point of the DL data burst is indicated by the retransmission indicator included in the data burst allocation information. When the DL data burst is retransmitted in consideration of the synchronous HARQ, the retransmission of the DL data burst is performed in the mth subframe of the kth frame. In Table 1, the frame index k is determined by the frame index j in which the HARQ feedback is transmitted, and the subframe index m has the same position as that of the previous HARQ subpacket transmission. At this time, a frame offset occurs due to the time interval between the transmission timing of the HARQ feedback and the start timing of the data retransmission. The time interval is defined as Gap2 and is determined according to Equation (4) below.

Here, N _{CTRL and TTI} are lengths of HARQ feedback transmission intervals according to DL HARQ operations, and F is the number of subframes constituting each frame. In the FDD system, since each link interval is continuous, Gap2 is determined by the UL HARQ feedback transmission interval and the number of subframes in the frame irrespective of the subframe index. Generally, the HARQ feedback has a transmission period of one subframe.

In the DL HARQ, the value of the DL HARQ transmission offset u is determined such that Gap2 in Equation (4) is not smaller than the transmission processing time (i.e., greater than or equal to). For example, u = 0 if Gap2 is not less than the transmission processing time, and u = 1 if Gap2 is less than the transmission processing time. Here, the u value is adjusted such that the next HARQ data is transmitted in the delayed frame. That is, the u value means an offset value in units of frames and does not mean a change in the subframe index.

When the determined u is considered, k is determined as shown in Equation (5) below.

As described above, when the time required for transmission signal processing is not secured, the HARQ retransmission time may be delayed by one frame (i.e., u = 1). In this specification, the term "sufficient time" means a case where the time required for signal transmission processing (transmission processing time) and the time required for signal reception processing (reception processing time) exceed a previously known reference value. Wherein the reference value is initially set or broadcast by the system.

If the frame index j, k is greater than or equal to the total number N of frames constituting one superframe, the superframe index s is increased by 1, and the frame indexes j, k are calculated by Equation (3) 5> modulo operation. Referring to Figures 1-2, N = 4 can be considered.

In Equation (2) and Equation (4), the DL HARQ feedback offset z and the DL HARQ transmission offset u in the FDD are the length of a transmission interval for a HARQ operation (burst or feedback) Can be determined according to the signal processing capability of the mobile terminal. The information on the signal processing capability is predefined or broadcast by the system. As another embodiment, z and u may be set to the predetermined values through the system configuration information according to the operation mode in the system, instead of being determined as described above.

4 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission in an FDD scheme according to an embodiment of the present invention. Assuming that F = 8, N = 4, and Tx / Rx processing time are 3 subframes, w = 0 and v = 0, respectively.

Referring to FIG. 4, when data burst allocation information is transmitted through the DL frequency band in the DL subframe 400 of the i-th frame, the transmitter transmits the UL frequency band in the UL subframe 410 of the i- Lt; RTI ID = 0.0 > UL < / RTI > In the DL subframe 420 of the (i + 1) th frame, the receiver transmits the HARQ feedback according to whether the UL data burst is error-detected through the DL frequency band. If the HARQ feedback in the DL subframe 420 is NACK, retransmission of the data burst is performed in the UL frequency band in the UL subframe 430 of the (i + 1) th frame by the transmitting end. At this time, when the burst allocation information indicating the UL burst retransmission is transmitted in the DL subframe 420, the burst retransmission is performed according to the allocation indication information.

Referring to Table 2, the frame index j to which the UL data burst is transmitted is determined as (i + floor (ceil (1 + 4) / 8) + 0) mod 4 = i, The subframe index m at which the UL data burst is transmitted is determined as {ceil (1 + 4) mod 8} = 5. The frame index k at which HARQ feedback is performed is determined by (j + floor ((5 + 4) / 8) + 0) mod 4 = i Frame. When the HARQ feedback is NACK, the frame index p at which retransmission of the HARQ data burst is performed is determined as (k + floor (ceil (1 + 4) / 8) + 0) mod 4 = i + 5. Table 2 below shows an embodiment of the UL HARQ operation timing structure of the FDD scheme. The following table is used to determine the transmission time point of at least one of the HARQ subpacket including the HARQ subpacket including the data burst allocation information and the HARQ subpacket including the data burst and the HARQ feedback and the HARQ retransmission subpacket including ACK and / or NACK. And it is needless to say that the present invention is not limited by the following table.

In Table 2, N denotes the number of frames constituting one superframe, where 4 is a case where each superframe is composed of four frames, and F denotes the number of subframes constituting one frame . And i, j, k and p denote a DL frame index or an UL frame index, l denotes a DL subframe index provided with data burst allocation information, m denotes an index of a subframe in which data burst transmission starts . Also, w denotes UL HARQ feedback offset, and v denotes UL HARQ transmission offset. Where w and v are frame units. 1, ..., N-1, p = 0, 1, ..., N-1, ..., N-1, l = 0, N A -MAP, ..., N A-MAP (ceil (F / N A-MAP) -1), m = 0,1, ..., F -1, n = 0,1, ..., F-1, w = 0,1, ..., w _max -1, and v = 0,1, ..., v _max -1.

The N _A-MAP means a period during which data burst allocation information is provided. N _A-MAP = 1 when data burst allocation information is provided every DL subframe, and N _A-MAP = 2 when data burst allocation information is provided between two DL subframe intervals. When N _A-MAP = 2, l = 0,2, ..., 2 (ceil (F / 2) -1).

In the UL HARQ transmission / reception of the FDD scheme, the UL data burst allocation information provided in 1 (lower case L) DL subframe of the i-th frame indicates the transmission of the data burst starting from the m-th UL subframe of the j- do. If data burst allocation information is provided for each DL subframe (i.e., N _A-MAP = 1), the data burst allocation information provided in each DL subframe indicates the transmission of the data burst starting in the UL subframe . That is, m = n. And two DL when the sub-frame each being provided with a data burst allocation information (i.e., _{N A-MAP = 2),} l number of data burst allocation information provided from the sub-frame is the n times UL sub-frame and n + 1 times UL sub Indicating that the transmission of the data burst in the frame will begin. That is, m is one of n or n + 1, and relevance information indicating this is indicated through data burst allocation information. Here, n is defined as n = ceil (l + F / 2) mod F by the DL subframe index l to which the data burst allocation information is transmitted.

The data burst indicated by the data burst allocation information may be transmitted through one or more subframes, and the information on the length N _TTI of the burst transmission interval is indicated by the data burst allocation information.

The HARQ feedback for the data burst started to be transmitted in the mth UL sub-frame of the j-th frame is transmitted in the DL sub-frame l (lower case of L) in the k-th frame. That is, the data burst allocation information and the HARQ feedback are transmitted in the same subframe index. Where k is determined by m and j as described in <Table 2>.

The v and w described in Table 2 can be calculated using UL HARQ transmission offset and UL HARQ feedback offset using Equation (2) and Equation (4) described above. The UL HARQ transmission offset v is considered for burst transmission or retransmission when data burst allocation information or HARQ feedback is received.

When retransmitting the UL data burst considering the asynchronous HARQ, the retransmission time point of the UL data burst is indicated by the retransmission indicator included in the transmission position of the data burst allocation information and the data burst allocation information. When retransmitting the UL data burst considering the synchronous HARQ, retransmission of the UL data burst is performed in the m subframes of the pth frame. As described in Table 2, the frame index p is determined by k and l .

The UL HARQ transmission offset v is a time interval in units of frames between DL burst allocation information or a transmission time point of a DL data burst and a DL data burst transmission interval N _TTI ) is determined in consideration of Gap1 'calculated by applying the transmission interval of the data burst allocation information or the HARQ feedback transmission interval. In general, the transmission interval of data burst allocation information or HARQ feedback is one subframe.

In the UL HARQ, the v value is adjusted such that the calculated Gap1 'is not smaller than the transmission processing time. For example, v = 0 if Gap1 'is not less than the transmission processing time, and v = 1 if Gap1' is less than the transmission processing time.

The UL HARQ feedback offset w is a time interval in units of frames between the transmission end point of the UL data burst and the transmission end point of the DL HARQ feedback. The UL HARQ feedback offset w is an UL burst transmission interval in place of the HARQ feedback transmission interval according to the DL HARQ operation in Equation And Gap2 'calculated by applying the interval.

In the UL HARQ, the w value is adjusted such that the calculated Gap2 'is not smaller than the reception processing time. For example, w = 0 if Gap2 'is not less than the reception processing time, and w = 1 if Gap2' is less than the reception processing time.

As described above, the UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to the length of the transmission interval for HARQ operation (burst or feedback) and the processing capability of the system (transmitting end and receiving end). The processing capability is predefined or broadcast by the system. In another embodiment, w and v may be broadcast at a constant value through the system configuration information according to how the system operates. In Table 2, if the frame index j, k, p is greater than or equal to N, the superframe index s is increased by 1, and the frame indices j, k, and p are calculated by the modulo operation of Table 2 And has the remaining value.

In the TDD communication mode, each frame includes DL subframes and UL subframes. In a preferred embodiment of the present invention, a link having a larger number of subframes is divided based on a link having a smaller number of subframes such that DL subframes and UL subframes have a certain correspondence. Each divided area is composed of one or more subframes, and has a correspondence relationship with any one subframe in the link having a smaller number of subframes. That is, M subframes are divided into N regions (M > N), and each subframe has a corresponding relationship according to the present invention. A detailed description of the correspondence will be described later.

5 is a diagram illustrating a DL HARQ operation timing structure of a 5: 3 TDD mode according to an embodiment of the present invention. As shown, the TDD frame structure of FIG. 2 will be referred to.

Referring to FIG. 5, the transmitter transmits data burst allocation information and a DL data burst in the DL subframe 500 of the i-th frame, and the receiver receives the HARQ feedback in the UL subframe 510 of the i- . The retransmission of the DL data burst according to the HARQ feedback is performed in the DL subframe 520 of the (i + 1) th frame by the transmitting end. At this time, data burst allocation information indicating DL data burst transmission in the DL DL subframe 520 may be transmitted. The HARQ feedback is performed in the UL subframe 530 of the (i + 1) th frame.

In the above description, the DL subframe index and the UL subframe index are defined in each link interval, but the DL and UL subframe indexes can be consecutively determined in one frame. In this case, the UL subframe index x is mapped to the subframe index D + x in the frame. Where D is the length of the DL section.

The above operation will be described again with reference to Table 3 below.

Table 3 below shows an embodiment of the DL HARQ operation timing structure of the TDD mode when DL: UL = D: U. Here, D represents the length (number of subframes) of the DL section, and U represents the length (number of subframes) of the UL section. The following table is used to determine the transmission time point of at least one of the HARQ subpacket including the HARQ subpacket including the data burst allocation information and the HARQ subpacket including the data burst and the HARQ feedback and the HARQ retransmission subpacket including ACK and / or NACK. And it is needless to say that the present invention is not limited by the following table.

In Table 3, D denotes the number of DL subframes constituting one DL frame, U denotes the number of UL subframes constituting one UL frame, N denotes a number of superframes Which is 4 when each super frame is composed of four frames. 1, the number of subframes constituting one frame is F = D + U, and i, j and k denote a frame index, 1 denotes a subframe index through which data burst allocation information is transmitted, Denotes an index of a subframe to be started, and n denotes a subframe index in which HARQ feedback is transmitted. Also, z denotes a DL HARQ feedback offset, and u denotes a DL HARQ transmission offset. Therefore, j = 0,1, ..., N -1, k = 0,1, ..., N-1, l = 0, N A-MAP, ..., N A-MAP (ceil ( _{D / n A-MAP) -1} ), m = 0,1, ..., D-1, n = 0,1, ..., U-1, z = 0,1, ..., z _max -1, and u = 0,1, ..., u _max -1.

The N _A-MAP means a period during which data burst allocation information is provided. When data burst allocation information is provided for every DL subframe, N _A-MAP = 1 and 1 ranges from 0 to D-1. When data burst allocation information is provided at two DL subframe intervals, N _{A -MAP} = 2. When N _A-MAP = 2, l = 0,2, ..., 2 (ceil (F / 2) -1).

The parameter K is a parameter defined by the relationship between D and U, and is defined, for example, by Equation (6) or Equation (7) below. That is, K may be K _c or K _f depending on the system bandwidth, the processing interval, the transmission period of the data burst allocation information (N _A-MAP ), etc. considered by the system. Here, K _c means the value calculated using the ceil () function, and K _f means the value calculated using the floor () function. The determination of the K value may vary depending on the system configuration. In general, K _f is used, but, it is F can be used while having the odd number, the system characteristics when _{D <U / N A-MAP} K c.

If the K _c and K _f is D is greater than or equal to U is zero or has a positive value, otherwise it has a negative value if it is.

In general, when F is an even number, ceil () and floor () perform the same operation, so that K _f and K _c have the same value. As another embodiment, the value of K may be set as follows. That is, K = - ceil (UD) / 2 when D <U and K = floor (DU) / 2 if D> = U. That is, K = - ceil (UD) / 2 when D <U and K = floor (DU) / 2 if D> = U can be expressed regardless of whether F is odd or even.

In the DL HARQ transmission / reception of the TDD mode, the DL data burst allocation information provided in the 1 &lt; th &gt; DL subframe of the i-th frame indicates the transmission of the data burst starting from the m-th DL subframe of the i-th frame. When data burst allocation information is provided for each DL subframe (i.e., N _A-MAP = 1), the data burst allocation information provided in each DL subframe indicates that transmission of the data burst in the corresponding DL subframe is started. That is, m becomes l . On the other hand, two DL sub-frame if that is each provided with a data burst allocation information (i.e., _{N A-MAP = 2),} l number of data burst allocation information provided from the sub-frame is the number l DL sub-frame and the l +1 times Indicating the transmission of the data burst starting in the DL sub-frame. That is, m is selected as one of l or l + 1, and the relevance information indicating the selection is indicated through the data burst allocation information.

The data burst indicated by the data burst allocation information may be transmitted via one or more subframes.

The HARQ feedback for the data burst transmitted in the m DL subframe of the i-th frame is transmitted in the n-th UL sub-frame of the j-th frame. Where n may correspond to one or more DL subframe indexes according to the DL and UL ratio (D: U). If D &lt; = U, each UL subframe corresponds to one DL subframe. However, in the case of D &gt; U, each UL subframe corresponds to one or more DL subframes. As defined in Table 3, the subframe index n is determined by K and m, and j is determined by i and z. That is, Table 3 defines a specific correspondence between the DL subframe index and the UL subframe index within one frame according to the DL: UL ratio. In Table 3, D = U is included in the case of D <= U, but D = U has K = 0, so D <= U and D> U have the same results. . In this specification, the case of D = U is included in the case of D <= U for the DL HARQ timing.

Here, z denotes a DL HARQ feedback offset as described in the FDD DL HARQ timing structure of Table 1, and is used to adjust a frame index in which an HARQ feedback operation is performed to secure sufficient reception processing time as described above do. In the TDD system, since the DL subframe and the UL subframe are alternately located in time in one frame, Gap3 calculated as Equation (8) is used to determine the DL HARQ feedback offset z.

In Equation (8), M _DATA is the number of subframes through which a data burst is transmitted, a is a subframe index at which transmission of a data burst starts, N _TTI is a length of a transmission interval of a data burst, and b Is a subframe index to which HARQ feedback is transmitted. Therefore, applying Table 3, M _DATA = D, a = m, b = n.

In the DL HARQ of the TDD mode, the DL HARQ feedback offset z is adjusted so that Gap3 calculated by Equation (8) is not smaller than the reception processing time. For example, z = 0 if Gap3 is not less than the receive processing time, and z = 1 if Gap3 is less than the receive processing time.

When a DL data burst is retransmitted in consideration of asynchronous HARQ, retransmission of the DL data burst is indicated by a retransmission indicator included in data burst allocation information. When the DL data burst is retransmitted in consideration of the synchronous HARQ, the retransmission of the DL data burst is performed in the mth subframe of the kth frame. In Table 3, the frame index k is determined by the frame indices j and u to which the HARQ feedback is transmitted. The DL burst retransmission is retransmitted according to the contents of the allocation information when the burst allocation information for instructing the retransmission of the DL data burst is transmitted.

Here, u denotes a DL HARQ transmission offset as described in the FDD DL HARQ timing structure of Table 1 and is determined according to Gap4 calculated as Equation (9). Gap4 represents the time interval between the transmission time of the HARQ feedback and the start point of the data retransmission in the TDD mode.

Here, M _CTRL is the number of subframes in which HARQ feedback is transmitted, b is a subframe index at which HARQ feedback is transmitted, and a is a subframe index at which retransmission of a data burst starts after HARQ feedback. Therefore, applying Table 3, M _CTRL = U, b = n, and a = m.

In the DL HARQ of the TDD mode, the DL HARQ transmission offset u is adjusted so that the Gap4 calculated through Equation (9) is not smaller than the transmission processing time. For example, u = 0 if Gap4 is not less than the transmission processing time, and u = 1 if Gap4 is less than the transmission processing time. Here, when u = 1, since the time required for transmission signal processing is not secured, the HARQ retransmission time is delayed by one frame.

In Table 3, if the frame index j, k is greater than or equal to the total number N of frames constituting one superframe, the superframe index s is increased by 1, (modulo) operation.

As another example, the DL HARQ feedback offset z and the DL HARQ transmission offset u may be determined by a mapping relationship between a data DL subframe and an UL subframe, a length of a HARQ operation (burst or feedback) transmission interval, and / . &Lt; / RTI &gt;

6 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission in a TDD mode according to an embodiment of the present invention.

Referring to FIG. 6, when the data burst allocation information is transmitted in the DL subframe 600 of the i-th frame, the transmitter transmits the UL data burst in the UL subframe 610 of the i-th frame. The receiver transmits HARQ feedback according to whether the UL data burst is successfully received in the DL subframe 620 of the (i + 1) th frame. The retransmission of the data burst according to the HARQ feedback is performed in the UL subframe 630 of the (i + 1) th frame by the transmitting end. When the burst allocation information indicating the retransmission of the UL data burst is transmitted in the DL subframe 620, the burst retransmission is performed by the burst allocation information.

In the above description, the DL subframe index and the UL subframe index are defined in each link interval, but the DL and UL subframe indexes can be consecutively determined in one frame. In this case, the UL subframe index x is mapped to the subframe index D + x in the frame. Where D is the length of the DL section.

This operation will be described again with reference to Table 4 below.

Table 4 below shows an embodiment of the UL HARQ operation timing structure in the TDD mode. The following table is used to determine the transmission time point of at least one of the HARQ subpacket including the HARQ subpacket including the data burst allocation information and the HARQ subpacket including the data burst and the HARQ feedback and the HARQ retransmission subpacket including ACK and / or NACK. And it is needless to say that the present invention is not limited by the following table.

In Equation (6), D denotes the number of subframes constituting one DL frame, U denotes the number of subframes constituting one UL frame, Is a parameter defined as Equation 7, and N denotes the number of frames constituting one superframe, and is 4 when each superframe is composed of four frames. And i, j, refers to the k, p is a frame index and, l refers to the subframe index that is transmitted, the data burst allocation information, and, m means a subframe index at which the transmission of a data burst starts, K is D Means a parameter defined by the relation of U and U. Also, w denotes UL HARQ feedback offset, and v denotes UL HARQ transmission offset. 1, ..., N-1, p = 0, 1, ..., N-1, ..., N-1, l = 0, N A - MAP, ..., N A -MAP (ceil (D / N A-MAP) -1), m = 0,1, ..., U -1, w = 0,1, ..., w _max -1, and v = 0,1, ..., v _max -1.

The N _A-MAP means a period during which data burst allocation information is provided. When data burst allocation information is provided for every DL subframe, N _A-MAP = 1 and 1 ranges from 0 to D-1. When data burst allocation information is provided at two DL subframe intervals, N _{A -MAP} = 2. When N _A-MAP = 2, l = 0, 2, ..., 2 (ceil (D / 2) -1).

In the UL HARQ transmission and reception of the TDD mode, the UL data burst allocation information provided in the 1 < th &gt; DL subframe of the i-th frame indicates the transmission of the data burst starting from the m-th UL subframe of the j-th frame. Where m may correspond to one or more DL subframes according to the DL and UL ratio (D: U) and the allocation information period N _A-MAP . If ceil (D / N _A-MAP ) ≥U, that is, if the number of DL subframes providing DL control information (data burst allocation information or HARQ feedback) is greater than or equal to the number of UL subframes, Each UL subframe corresponds to one or more DL subframes. However, when the number of DL subframes providing the DL control information (data burst allocation information or HARQ feedback) is smaller than the number of UL subframes, in the case of ceil (D / N _A-MAP ) A frame corresponds to one or more UL subframes.

If the number of DL subframes for which data burst allocation information is provided is equal to or greater than the number of UL subframes (ceil (D / N _A-MAP ) ≥ U), data burst transmission in one UL subframe may be performed by one or more May be indicated in the DL subframe. In other words, if l is less than K, the l times DL allocation of data bursts in the sub-frame information, and indicating a data burst transmission from zero, one UL sub-frame, while l is equal to or greater than K is less than U + K in l times DL data burst allocation information of the subframe (lK) indicating the number of data bursts transmitted beginning at the sub-frame, and l a is l times DL allocation of the data bursts in the sub-frame, if greater than or equal to U + K Information indicates a data burst transmission starting from the U-1 subframe.

If the number of DL subframes for which the data burst allocation information is provided is smaller than the number of UL subframes (ceil (D / N _A-MAP ) <U), in the DL subframe in which the data burst allocation information is provided, The data burst transmission in the UL sub-frame can be instructed. For example, the data burst allocation information of the DL subframe # 0 indicates that the data burst is transmitted in the UL subframe # 0 through ( 1- K + N _A-MAP- 1), and the relevance information Is indicated through the data burst allocation information.

When the data burst allocation information is provided only through one DL subframe (ceil (D / N _A-MAP ) = 1), data burst transmission in all UL subframes is indicated in the corresponding DL subframe. The transmission interval (TTI) of the data burst may be indicated via data burst allocation information, and the frame index j is determined by i and v.

The v and w described in Table 4 represent the UL HARQ transmission offset and the UL HARQ feedback offset as described in the FDD UL HARQ timing structure of Table 2, respectively. The UL HARQ transmission offset v is considered to determine a time point for transmission or retransmission of a data burst after receiving data burst allocation information or HARQ feedback. As described above, in order to secure sufficient transmission processing time, It is used to adjust the frame index on which the operation is performed.

In the UL HARQ of the TDD mode, the UL HARQ transmission offset v is calculated by substituting D, which represents the number of DL subframes to which control information such as data burst allocation information or HARQ feedback is transmitted, into M _CTRL in Equation (9) , b is determined according to Gap4 ', which is calculated by substituting l indicating a subframe index to which data burst allocation information or HARQ feedback is transmitted, and assigning m indicating a subframe index in which a data burst is transmitted or retransmitted to a.

When Gap 4 'is smaller than the transmission processing time, v = 1, and v = 0 if Gap 4' is smaller than the transmission processing time according to the result of comparing transmission processing time required for transmission of the data burst after HARQ feedback and Gap 4 '.

Further, in the TDD mode UL HARQ mode, UL HARQ feedback offset w is to adjust the transmission time of the HARQ feedback after reception of the data burst, the above-described <Equation 8> In the sub-frame to be transmitted, the data burst to M _DATA Is determined according to Gap3 'calculated by substituting the number U of numbers.

According to the result of comparing the Gap 3 'and the reception processing time required for transmission of the HARQ feedback after the UL data burst, w = 1 if Gap 3' is smaller than the reception processing time, and w = 0 otherwise.

HARQ feedback for the data burst transmission from the m times, the UL subframe j of one frame is made in one l DL sub-frame of the k time frames. That is, data burst allocation information and HARQ feedback are transmitted in the same subframe index. Where k is determined by j.

When retransmitting the UL data burst considering the asynchronous HARQ, the retransmission time point of the UL data burst is indicated by the retransmission indicator included in the data burst allocation information. When retransmitting the UL data burst considering the synchronous HARQ, retransmission of the UL data burst is performed in the m subframes of the pth frame. As described in Table 4, the frame index p is determined by the UL HARQ transmission offset v and the frame index k at which the HARQ feedback is transmitted. If the frame index j, k, p is greater than or equal to N, the superframe index s is increased by 1, and the frame indices j, k, and p have residual values by the modulo operation of Table 4. [

In the above description, HARQ timing is determined according to the formulas of Table 1 through Table 4, but in the modified embodiment, all possible input values (for example, DL / UL subframe count, subframe index , Processing time, and the like) in the transmitter and the receiver, the HARQ timing can be determined by reading the desired result value from the table.

HARQ  Calculation of feedback / transmission offset

Hereinafter, embodiments for obtaining the HARQ feedback offset w, z and the HARQ transmission offset v, u will be described.

The HARQ feedback offsets w and z and the HARQ transmission offsets v and u are the mapping relationship between the DL subframe and the UL subframe, the length of the transmission interval for HARQ operation (burst or feedback) and / or the length of the transmission interval for the system (transmitting and / Can be determined according to the signal processing performance of the signal processor. In another embodiment, the feedback offsets may be defined by a constant value rather than being determined by the information and broadcast by the system. The definition of the offsets according to the HARQ operation can be summarized as follows.

At least one of the HARQ feedback offset z and the HARQ transmission offset u for the DL HARQ operation according to the FDD mode is calculated by Equation (10).

Here, Rx_Time1 indicates the reception processing time for the DL data burst, which is determined by the processing capability of the receiving end, and Tx_Time1 indicates the transmission processing time of the DL data burst, which is determined by the processing capability of the transmitting end. Rx_Time1 and Tx_Time1 may be collectively referred to as a processing time for a data burst. Here, the reception processing of the data burst includes, for example, multiple input multiple output (MIMO) reception processing (Rx processing), demodulation, decoding, and the like. The transmission processing of the data burst includes, for example, encoding, modulation, MIMO transmission processing (Tx processing), and the like. Since the DL HARQ is mainly used, the receiving end considers the base station and the transmitting end considers the base station. The HARQ feedback transmission interval is one subframe, and the burst transmission interval is N _TTI .

At least one of the HARQ transmission offset v and the HARQ feedback offset w for the UL HARQ operation according to the FDD mode is calculated by Equation (11).

Here, Rx_Time2 indicates the reception processing time for the UL data burst, which is determined by the processing capability of the receiving end, and Tx_Time2 indicates the transmission processing time of the UL data burst, which is determined by the processing capability of the transmitting end. Rx_Time2 and Tx_Time2 may be collectively referred to as processing time for the data burst. However, since it is UL HARQ, the receiving terminal is a base station and the transmitting terminal is a terminal.

At least one of the HARQ feedback offset z and the HARQ transmission offset u for the DL HARQ operation according to the TDD mode is calculated by Equation (12).

Here, Rx_Time3 and Tx_Time3 indicate the reception processing time and the transmission processing time for the DL data burst, respectively. Rx_Time3 and Tx_Time3 may be collectively referred to as a processing time for the data burst.

At least one of HARQ transmission offset v and HARQ feedback offset w for UL HARQ operation according to the TDD mode is calculated by Equation (13).

Here, Rx_Time4 and Tx_Time4 indicate the reception processing time and transmission processing time for the UL data burst, respectively. Rx_Time4 and Tx_Time4 may be collectively referred to as processing time for the data burst.

Considering synchronous HARQ, the transmission processing time in UL HARQ operations may be considered differently depending on the initial transmission or retransmission. That is, Tx_Time2 and Tx_Time4 in Equations (11) and (13) can be replaced by Tx_Time_NewTx and Tx_Time_ReTx depending on whether or not the initial transmission is performed. Here, Tx_Time_NewTx denotes a transmission processing time for initial transmission and Tx_Time_ReTx denotes a transmission processing time for retransmission. As described above, the initial transmission should encode the burst according to the burst allocation information, but the encoding in the retransmission indicated by the NACK can be performed by recycling the pre-encoded burst in the initial transmission. Therefore, the transmission processing time required for the initial transmission and the retransmission are considered different, so that the HARQ transmission offset can be adjusted.

In addition, according to the retransmission triggering method, the transmission processing time for retransmission can be divided into Tx_Time_ReTx1 and Tx_Time_ReTx2. As the retransmission triggering method, there is a case where only NACK is indicated, or allocation information for NACK and retransmission is transmitted. Tx_Time_ReTx1 denotes a transmission processing time for retransmission triggered only by NACK, and Tx_Time_ReTx2 denotes a transmission processing time for retransmission triggered by allocation information for retransmission.

Similarly, the UL HARQ transmission offset in Table 2, Table 4, Equation (11), and Equation (13) can be _expressed as v _new and v _RxTx considering the transmission processing time for initial transmission or retransmission, respectively. And can be adjusted separately. Where v _new is the UL HARQ transmission offset for the initial transmission of the burst considering the transmission processing time of _{Tx_Time_NewTx} and v _RxTx is the UL HARQ transmission offset for retransmission of the burst considering the transmission processing time of Tx_Time_ReTx.

Lagucy Support for legacy systems mode

A wireless mobile communication system using an IEEE 802.16m Advanced Air Interface (AAI) is a wireless mobile communication system having a predetermined frame offset within a superframe structure, And coexist with the mobile communication system. That is, each frame in the 16m mode, together with DL subframes and UL subframes, includes a frame offset to compensate for the difference for the 16e mode frame. In this case, the HARQ operation timing structure of the TDD mode follows the HARQ operation timing structure of Table 3 and Table 4 according to the DL and UL ratios in a period in which the network node and the UE operate in the IEEE 802.16m mode.

The mapping relationship between the DL subframe and the UL subframe is determined according to the DL / UL ratio in a section in which the network node and the terminal operate in the IEEE 802.16m mode. That is, the subframe index and the number of transmission intervals for the HARQ operation are determined according to the DL / UL ratio. However, since the IEEE 802.16e mode and the IEEE 802.16m mode coexist in one frame, the frame index is determined not based on the DL / UL ratio in the section operating in the 16m mode but on the basis of the total DL / UL ratio in the TDD system All.

Herein, the number of subframes of each link interval in the TDD system is D 'and U', and the index of the subframe according to the DL / UL ratio D ': U' in the TDD system is l ' , m', n ' do. In the 16m mode, the number of subframes of each link section is denoted by D and U, and the index of a subframe according to the DL / UL ratio D: U in the section operating in the 16m mode is denoted by l ' , m, n .

The HARQ operation timing in the section operating in the 16m mode except for the legacy section operating in the 16e mode is performed in the same manner as in Table 3 and Table 4 using the sub- It has a defined timing structure. However, the frame indices i, j, k determined according to the HARQ feedback offset z or w and the HARQ transmission offset u or v are the subframe indices l ' , m', n 'within D' .

FIG. 7 is a diagram illustrating a HARQ operation timing structure according to a DL data burst transmission in a 5: 3 TDD mode in a mode where two systems coexist according to an embodiment of the present invention. As shown in FIG. 7, two DL subframes and an UL FDM region are assigned for a mode supporting a raising system (i.e., a legacy supporting mode), and are used in a lagging mode Subframe indexes are renumbered in the interval excluding the interval. That is, in the entire TDD system, the DL frame is composed of DL subframes 0 to 4, and the DL subframes 2 to 4 in the region operating in the 16m mode have reordering DL subframe indices 0, 1 and 2, respectively . Since the UL coexists in FDM, the 16m operating mode occupies the entire UL section. Therefore, a frame operating in the 16m mode is composed of three DL subframes and three UL subframes.

Referring to FIG. 7, since D = 3 and U = 3, K = 0. On the other hand, D 'is 5 and U' is 3. In the transmission of the TDD DL HARQ data burst, the data burst allocation information and the data burst are transmitted in the 0th DL sub-frame of the i-th frame, and the HARQ feedback is transmitted in the 0th UL sub-frame of the i-th frame. The retransmission of the HARQ data burst is performed in the DL subframe # 0 of the (i + 1) th frame. The feedback on this is performed in the DL subframe # 0 of the (i + 1) th frame. Here, the transmission / reception processing time is considered as 2 subframes, respectively.

8 is a diagram illustrating a HARQ operation timing structure according to a UL data burst transmission in a TDD mode in a mode in which two systems coexist according to an embodiment of the present invention.

Referring to FIG. 8, according to the same frame structure as FIG. 7, D = 3 and U = 3, so that K = 0. In the transmission of the TDD UL HARQ data burst, the data burst allocation information is transmitted in the 0th DL sub-frame of the i-th frame, and transmission of the UL data burst is performed in the 0th UL sub-frame of the i-th frame. The HARQ feedback is performed in the 0th DL subframe of the (i + 1) th frame, and the retransmission of the HARQ data burst is performed in the 0th UL subframe of the (i + 1) th frame. At this time, data burst allocation information indicating transmission of UL data burst in the DL sub-frame # 0 may be transmitted. Here, the transmission / reception processing time is considered as 2 subframes, respectively.

Meanwhile, there are resources used in the IEEE 802.16e wireless mobile communication system in the frame offset period shown in FIG. 7 and FIG.

The HARQ operation timing structure proposed in Tables 1 to 4 is determined according to a subframe index to which burst allocation information is transmitted or a subframe index to start transmission of a data burst irrespective of a transmission interval length of a data burst . Therefore, when the synchronous HARQ is used, the HARQ feedback is transmitted only in a specific subframe periodically, so that the receiver can save the power for monitoring the reception of the HARQ feedback and efficiently support co-located coexistence (CLC).

Long transmission interval (long TTI ) Use of

As another embodiment of the present invention, when the data burst is transmitted over two or more subframes, i.e., the HARQ timing according to the long transmission period (long TTI), the HARQ timing described in < Table 1 > The HARQ feedback timing can be determined according to the subframe index at which transmission of the data burst ends instead of the subframe index at which transmission of the data burst starts. This decision scheme can be used mainly for fast ACK timing in the asynchronous HARQ scheme.

The timing of HARQ feedback in Table 1 is adjusted as follows. That is, instead of the first subframe index m of the data burst transmission interval, the indexes of the UL subframe and the frame, in which HARQ feedback is transmitted according to the last subframe index m '(= m + N _{TTI -} 1) of the data burst transmission interval, .

9 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission of the FDD scheme according to another embodiment of the present invention. In this case, N _TTI = 4, F = 8, N _A-MAP = 1, transmission / reception processing time is assumed to be 3 subframes or less, DL HARQ feedback offset z and DL HARQ transmission offset u are 0, respectively.

Referring to FIG. 9, the data burst allocation information provided in the DL subframe # 1 of the i-th frame is transmitted in the burst transmission interval 900 from the DL subframe # 1 to the DL subframe # Is transmitted. The HARQ feedback for the DL data burst is transmitted to the 0th UL subframe 910 of the (i + 1) -th frame corresponding to the 4th DL subframe of the i-th frame according to the sub- Lt; / RTI &gt; That is, n = 0 (= ceil (1 + 4-1 + 4) mod 8) and j = i + 1 (= ))to be. In case of the synchronous HARQ, the data burst transmission 920 after the HARQ feedback starts in DL subframe # 1 of the (i + 2) th frame, which is the same subframe position as before.

As described above, in determining the HARQ feedback timing in Tables 1 to 2, instead of the subframe index m at which transmission of the data burst starts, at least one subframe among the at least one subframe in which the data burst is transmitted The HARQ feedback timing can be determined using m ', which is an index of the HARQ feedback.

Similarly to the DL HARQ operation timing structure of the TDD mode, for a faster ACK timing, a subframe index m '(= m + N _{TTI) in which} the transmission of the data burst ends, _- 1) to the above-mentioned Table 3, HARQ feedback timing can be determined.

10 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in TDD mode according to another embodiment of the present invention. Here, N _TTI = 4, D = 4, U = 4, the transmission / reception processing time is 3 subframes, and K = 0 and z = 0.

Referring to FIG. 10, the data burst allocation information provided in the DL DL subframe of the i-th frame includes DL data bursts (DL data bursts) in the burst transmission interval 1000 from the 0 DL subframe to the 3 DL subframes of the i- Is transmitted. The HARQ feedback for the DL data burst is transmitted in the UL subframe 1010 of the i-th frame corresponding to the DL subframe # 3 in the i-th frame, according to Table 3. That is, n = 3 (= 3-0) and j = i (= (i + 0) mod 4). In the case of synchronous HARQ, when data retransmission after HARQ feedback is required, the data burst retransmission 1020 starts in the DL subframe 0 of the (i + 2) th frame, which is the same subframe position as before.

However, in the HARQ timing structure for the long TTI transmission in the TDD system, a method of providing fast HARQ feedback timing in accordance with the DL: UL ratio and the transmission / reception processing time is different. As an example, HARQ feedback timing for a long TTI (5 subframes) for a DL HARQ in a 5: 3 TDD mode when the transmission / reception processing time is 3 subframes and the TTI is the entire interval of the link will be described.

If the HARQ feedback timing is provided according to the transmission start time of the data burst, the HARQ feedback is provided in the UL subframe of the next frame corresponding to the DL DL subframe at which transmission of the data burst starts. On the other hand, if the HARQ feedback timing is provided according to the transmission end point of the data burst, the HAQR feedback is provided in UL subframe # 3 of the next frame corresponding to the DL subframe # 4 at which transmission of the data burst ends. When a long TTI is used in the DL HARQ in the 5: 3 TDD mode, using the transmission start time of the data burst provides fast HARQ feedback timing for a longer TTI than using the transmission burst end time of the data burst .

As another example, feedback timing for a long TTI (4 subframes) for DL HARQ in 4: 4 TDD mode is described.

If the HARQ feedback timing is provided according to the transmission start time of the data burst, the HARQ feedback is provided in the UL subframe of the next frame corresponding to the DL DL subframe at which transmission of the data burst starts. On the other hand, if the HARQ feedback timing is provided according to the transmission end point of the data burst, the HARQ feedback is provided in UL subframe 3 of the same frame corresponding to the DL DL subframe 3 where data burst transmission ends. In the 4: 4 DL mode HARQ, unlike in the 5: 3 DL mode, using the transmission end point of the data burst provides fast HARQ feedback timing for a longer TTI than using the data burst start point do.

Therefore, in the embodiment of the present invention, an appropriate HARQ operation timing structure is selected according to the DL / UL ratio and the transmission / reception processing time. Specifically, in determining HARQ feedback timing in Tables 1 to 4, instead of the subframe index m at which transmission of the data burst is started, the index of the last subframe among the at least one subframe in which the data burst is transmitted m '(= m + N _TTI -1) may be used. The information on the HARQ operation timing structure may be provided through the DL common control channel as system information, for example.

HARQ  Change in feedback / transmission offset

Hereinafter, another embodiment of the DL and UL HARQ operation timing structure of the TDD mode proposed in the present invention will be described. Specifically, the HARQ feedback offset and the HARQ transmission offset change according to the subframe positions in which the DL or UL transmission is performed will be described

11A and 11B show a HARQ operation timing structure for N _A-MAP = 1 when D + U = 8.

FIG. 11A shows a HARQ operation timing structure when D: U = 5: 3 and the burst transmission interval is one subframe. Referring to FIG. 11A, when the transmission / reception processing time is 2 subframes, the HARQ feedback / transmission offset = 0. That is, since the processing for transmission of each DL subframe can be completed in two subframes (i.e., Gap3 and Gap4 are greater than two), the corresponding UL transmission is made without delay in the following UL interval. Likewise, since the processing for transmission of each UL subframe is completed within two subframes (i.e., Gap3 and Gap4 are greater than two), the corresponding DL transmission is performed without delay in the subsequent DL interval.

On the other hand, when the transmission / reception processing time is 3 subframes each, the HARQ UL transmission timing associated with the 4th DL subframe is delayed by one frame period. This is because it takes 3 subframes for transmission of DL subframe # 4 but it is difficult to perform UL transmission within 2 subframes (= 5 - 4 - 1 + 2), which is an interval up to the corresponding UL subframe # 2 . Therefore, the UL transmission in the UL subframe # 2 corresponding to the DL subframe # 4 is delayed by one frame, that is, the second UL subframe in the (i + 1) th frame.

11B shows a HARQ operation timing structure for a case where D: U = 3: 5 and the burst transmission interval is one subframe. Referring to FIG. 11B, when the transmission / reception processing time is 2 subframes, the HARQ feedback / transmission offset = 0. On the other hand, when the transmission / reception processing time is 3 subframes, the UL transmission timing in the UL subframe associated with the 0 DL subframe is delayed by one frame period since Gap = 3-0-1-0 = 2 And Gap = 5-4-1 + 2 = 2, the DL transmission timing in the DL subframe # 2 associated with the UL subframe # 4 is delayed by one frame period. This is because each Gap is smaller than the transmission or reception processing time.

12 shows a HARQ operation timing structure for D + U = 7.

FIG. 12A shows a HARQ operation timing structure when D: U = 4: 3, N _A-MAP = 1 and the burst transmission interval is one subframe. Referring to FIG. 12 (a), when the transmission / reception processing time is 2 subframes, the HARQ feedback / transmission offset = 0. If the transmission / reception processing time is 3 subframes, Gap = 4-3-1 + 2 = 2, so that the HARQ UL transmission timing in the UL subframe 2 associated with the DL subframe # 3 is delayed by one frame period do.

12 (b) shows an HARQ operation timing structure for a case where D: U = 3: 4, N _A-MAP = 1 and the burst transmission interval is one subframe. In this case was used the K _c (= -1) according to ceil () Since D + U is an odd number while D <U. Referring to FIG. 12B, when the transmission / reception processing time is 2 subframes, the HARQ feedback / transmission offset = 0. On the other hand, when the transmission / reception processing time is 3 subframes each, the HARQ UL transmission timing is delayed by one frame period in the UL subframe 0 associated with the 0 DL subframe.

13 shows a HARQ operation timing structure for N _A-MAP = 1 when D + U = 6.

FIG. 13 (a) shows a HARQ operation timing structure for a case where D: U = 4: 2 and the burst transmission interval is one subframe. Referring to FIG. 13 (a), when the transmission / reception processing time is two sub-frames, the HARQ UL transmission timing associated with the DL sub-frame # 3 is delayed by one frame period. In addition, when the transmission / reception processing time is 3 subframes, the HARQ DL transmission timing associated with the UL subframe # 0 is delayed by one frame period, and the HARQ UL and DL The transmission timings are each delayed by one frame period. In addition, the HARQ UL transmission timing associated with the third DL subframe is delayed by one frame period.

FIG. 13 (b) shows a HARQ operation timing structure for one subframe in which the burst transmission interval is D: U = 3: 3. Referring to FIG. 13 (b), when the transmission / reception processing time is 2 subframes, the HARQ feedback / transmission offset = 0. If the transmission / reception processing time is 3 subframes each, the HARQ feedback / transmission offset is delayed by 1, i.e., one frame period.

Relay structure

Hereinafter, a HARQ operation timing structure in a wireless mobile communication system supporting a relay structure according to a preferred embodiment of the present invention will be described.

When the relay structure is supported, the base station and the terminal directly communicate with each other or through at least one relay station (RS), and the repeaters between the base station and the terminal communicate with the odd-hop RS or the even- Relay station (Even-Hop RS). Each of the RSs includes a controller for determining a timing to perform HARQ transmission according to a frame structure and a HARQ operation timing to be described later, and a controller for determining at least one of transmission and reception of data burst and HARQ feedback at a timing according to the control of the controller And a transceiver. Here, data transmission is equally applied to data transmission between a base station and a relay station or data transmission between a relay station and a terminal.

In this specification, an HARQ operation timing structure in a section in which a relay station and a terminal operate in a 16m mode will be described as an embodiment.

FIG. 14 illustrates a frame structure of a wireless mobile communication system supporting a relay structure according to a preferred embodiment of the present invention.

14, a frame 1410 of a base station includes a DL access region 1412 directly transmitted from a base station to a terminal, a DL transmission region 1414 transmitted from a base station to a terminal or a relay station, Coding Receive Zone) 1416, a UL access region 1418 received from the UE, and a UL receiving region 1420 received from the UE or the relay station. Between the transmission areas 412 and 1414 and the reception areas 1416, 1418 and 1420, there is a gap 1422 for transmission / reception switching. In FIG. 14, the frame structure is an example, and one frame includes at least one of the above-described DL access area, DL transmission area, network coding reception area, UL access area, and UL reception area.

The frame 1420 of the odd-hop relay station includes a DL access area 1432 transmitted to the terminal, a DL transmission area 1434 transmitted to the terminal or the even-hop relay station, and a DL reception area 1434 received from the even- And a UL transmission region 1442 that is transmitted to an even-numbered relay station or a base station. There are intervals 1444, 1446 and 1448 for transmission / reception switching between the transmission areas 1432, 1434, 1438 and 1442 and the reception areas 1436 and 1440.

The frame 1450 of the even-numbered relay station includes a DL access region 1452 transmitted to the terminal, a DL receiving region 1454 received from the odd-hop relay station and a DL transmitting region 1456 transmitted to the odd- A UL transmission region 1460 transmitted to an odd-hop relay station, and a UL reception region 1462 received from a terminal or an odd-hop relay station. Intervals 1464, 1466, 1468, 1470 for transmission / reception switching exist between the transmission areas 1452, 1456, 1460 and the reception areas 1454, 1458,

As described above, the HARQ operation timing structure in the area where at least one RS communicates with the UE is similar to the HARQ operation in the mode supporting the raising system described above, The mapping relationship is determined according to the DL: UL ratio in an area communicating with the terminal within the frame of the relay station, and the frame index is determined according to the determined subframe index based on the DL: UL ratio.

15A and 15B are views illustrating an example of a frame structure of a relay station in a TDD mode according to an embodiment of the present invention. Here, a TDD frame structure in which D ': U' = 4: 4 is shown, and a network coding transmission / reception area is omitted.

Referring to FIG. 15A, 0 to 2 DL subframes in an i-th frame used by an odd-hop relay station are used for DL transmission, that is, transmission from a relay station to a terminal or a lower relay station, DL reception, that is, reception from the base station. The UL subframe # 0 and # 1 are used for UL reception, that is, reception from the terminal, and the remaining two UL subframes are used for UL transmission, that is, transmission to a higher relay station or a base station.

Referring to FIG. 15B, in the i-th frame used by the even-numbered relay station, the DL subframe at the 0th and the last located at the beginning of the DL interval is used for DL transmission, i.e., transmission from the relay station to the terminal, Are used for DL reception, that is, reception from the upper odd-hop relay station. The UL subframe # 0 and # 1 located at the end of the UL section are used for UL reception, that is, reception from the terminal. The two preceding UL subframes are used for UL transmission, that is, transmission to the upper odd-hop relay station do.

16A and 16B illustrate a HARQ operation timing structure for an odd-hop RS according to an embodiment of the present invention. Where D: U = 3: 2.

16A shows a HARQ operation timing structure in which K = 0 and K _f is considered using a floor operation. As shown in the figure, the HARQ UL transmission timing corresponding to the DL subframe # 2 is delayed by one frame period. 16B shows an HARQ operation timing structure in which K = 1 and K _c are considered by using the ceil operation. As shown in the figure, the HARQ UL transmission timing corresponding to the first and second DL subframes corresponds to one frame period Delayed.

FIG. 17 illustrates a HARQ operation timing structure for an even-numbered relay station according to an embodiment of the present invention. Where D: U = 2: 2. As shown in the figure, the HARQ DL transmission timing corresponding to the UL subframe # 0 is delayed by one frame period.

As described above, a value of K that can provide faster HARQ timing needs to be selected according to the DL / UL ratio and the transmission / reception processing time. The system operator can select an appropriate HARQ operation timing structure and a value of K according to the system configuration information such as the DL / UL ratio and the transmission / reception processing time operated by the system, and the system configuration information is provided through the DL common control channel .

Long transmission interval (long TTI ) For HARQ  Timing structure

Referring to Table 3 and Table 4, HARQ timing structure according to allocation information for long TTI transmission will be described below.

In DL HARQ, when allocation information indicating transmission of a data burst having a long TTI is transmitted in a certain DL subframe, the long TTI transmission indicated by the allocation information is transmitted in the first DL subframe of the next frame , And the feedback thereof is transmitted in the UL sub-frame corresponding to the DL sub-frame (the sub-frame in which burst allocation information is indicated) of the subsequent frame. And the long TTI transmission indicated by the allocation information provided in some DL subframe in the UL HARQ is not possible in the same frame, the UL data burst is transmitted in the first UL subframe (the UL subframe 0) of the next frame, Feedback on this is transmitted in a DL sub-frame having the same index as the DL sub-frame of the frame (burst allocation information indicated sub-frame). The frame index is determined by the HARQ transmission offset and the HARQ feedback offset described above. A detailed explanation is as follows. For example, if the DL long TTI occupies the entire DL interval (N _TTI = D), the burst transmission should start in the DL subframe 0. However, when the burst allocation information indicates that the burst allocation information transmitted in the DL sub-frame after the transmission start time, i.e., when l is not 0 indicates DL long TTI transmission, the data burst is not transmitted in the same frame, It is assumed that a long TTI transmission is instructed.

Referring to Table 3, in the DL HARQ, the allocation information transmitted in the DL sub-frame of l (lower case of L) of the i-th frame is N _A-MAP And instructs the burst transmission in the DL subframe m times according to the following equation. However, in case of long TTI transmission, the transmission start position of the data burst is determined by the DL sub-frame index m and the transmission interval (N _TTI ). Therefore, the long TTI transmission starts in the DL subframe h of the frame a and the corresponding HARQ feedback is transmitted in the fth UL subframe of the frame b. If the UL HARQ feedback is a NACK, the retransmission is performed in the DL DL frame or the DL DL frame of the c-th frame. Here, the frame indexes a, b and c and the subframe indices h and f are indexes (i, l, m) obtained from the allocation information, the UL subframe index n corresponding thereto, and the transmission interval _NTI Is determined as follows.

That is, the long TTI transmission indicated in the allocation information starts at m subframes of frame i if Dm? N _TTI , so a = i and h = m. On the other hand, if the Dm <N _TTI, long TTI transmission from 0 sub-frame of m times DL sub because the remaining period of the subsequent frame may be a burst of N _TTI length of transport is smaller than N _TTI next frame (i + 1) is And a = i + 1 and h = 0.

The UL subframe index f to which UL HARQ feedback for the transmitted burst is transmitted is determined by the DL subframe index l to which the allocation information is transmitted so that the UL HARQ feedback does not converge on a specific UL subframe. Here, the relationship between l and f follows the relation of m and n defined in <Table 3>. Therefore, UL HARQ feedback is transmitted in the next frame, so b = a + 1 (= i + 2).

i번 프레임의 2번 DL 서브프레임에서 전송되는 할당 정보(즉 l=2)에 대한 긴 TTI 전송은, 5(=D) - 2(=m) < 5(=N_TTI)이므로, i+1 (=a)번 프레임의 0 (=h)번 DL 서브프레임에서 시작되고, 이에 대한 UL HARQ 피드백은 i+2 (=b)번 프레임의 1 (2-1=n)번 UL 서브프레임에서 전송된다. For example, when N _TTI = 5, N _A-MAP = 1, K = 1 and the transmission / reception processing time (Tx / Rx Processing time) = 3 in the 5: 3 TDD structure,

Long TTI transmission to the allocation information (i.e., l = 2) transmitted in the step 2, DL sub-frame of the i-th frame, 5 (= D) - so 2 (= m) <5 ( = N TTI), i + 1 (= h) DL subframes of the (i + 2) th frame (= a) 1 (2-1 = n) UL subframe.

As another example, if a long TTI interval occupies the entire downlink interval in the TDD DL, the burst transmission always starts in the DL DL subframe. If in such a system l times, the data burst allocation information transmitted in the DL sub-frame to indicate the long TTI transmission of DL, if l = 0 sub-frame index for the HARQ operation, m, n and the frame index j <Table 3> . On the other hand, if l ? 0, the data burst corresponding to the data burst allocation information indicates a burst transmission starting from the 0th frame of the (i + 1) th frame, which is not the i- 0) The feedback for the data burst is transmitted in the n-th sub-frame of the j-th frame, where n and j are determined according to Equation (14) instead of Table 3. That is, the position ( n , j ) at which the HARQ feedback is transmitted is determined using the DL subframe index l in which the data burst allocation information is provided and the frame index i + 1 in which the data burst is transmitted.

Here, m = 0 and N _TTI = D, so that z is calculated as Equation (15) by substituting in Equation (12). Where n is determined by the DL subframe index l at which the data burst allocation information is transmitted.

For the UL HARQ, reference to <Table 4>, i time frame of l one DL assignment sent from the sub-frame information from the N _A-MAP and a DL subframe index m one UL sub-frame of the j time frames according to l Indicates a burst transmission to begin with. In the case of a long TTI transmission, the transmission start position of the data burst is determined by the UL subframe index m and the transmission interval (N _TTI ). Therefore, the long TTI transmission starts in UL subframe h of the frame a and the corresponding HARQ feedback is transmitted in the DL subframe f of the frame b. If the DL HARQ feedback is a NACK, retransmission is performed in UL subframe h of frame c. The frame indices a, b, c, and sub-frame index, h, f is the index to be transmitted is assigned to information (i, l) and the corresponding UL frame and a subframe index that is (j, m), transmission interval (N _TTI) Is determined as follows.

That is when the, so long TTI transmission indicated in the allocation information is Um ≥ N is the _TTI if j = i starting at m times the sub-frame of the j time frames, and a = i and h = m, while the Um <N _TTI , is the j = i + 1 is longer TTI transmitted in 0 the UL subframe of the next frame (i + 1) because the remaining period of the subsequent m number UL sub-frame may be a burst of N _TTI length of transport is smaller than N _TTI As a start, a = i + 1 and h = 0. And DL HARQ feedback is provided in the DL subframe index # 1 , so f = l. DL HARQ feedback is provided in a frame b = a + 1 if UhN _TTI + 1 ? Rx_Time 4 and DL HARQ feedback is provided in a frame b = a + 2 if UhN _TTI + l <Rx_Time 4. / RTI > If DL HARQ feedback is a NACK, retransmission starts in UL subframe h of frame c, where c = b if a = i and c = b if a = i + = b + 1.

For example, when N _TTI = 3 and N _A-MAP = 1 in the 5: 3 TDD structure and the transmission / reception processing time (Tx / Rx Processing time) = 3, UL burst transmission for the assignment information is, 3 (= U) - 1 (= m) <3 (= N TTI) , so, i + 1 (= a) of the time frame 0 (= h) time starting from UL subframe And the DL HARQ feedback for the i + 2 (= b) frame is 3 (= U) - 0 (= h) -3 (= N _TTI ) + 2 In the 2 (= f) UL sub-frame. If the DL HARQ feedback is NACK, the HARQ transmission offset is 1, so that the retransmission is transmitted in the UL subframe 0 of i + 3 (= b + 1) frames as calculated by a = i + 1.

As another example, if a long TTI interval occupies the entire uplink interval in the TDD UL, the burst transmission always starts in the zero subframe. In this system, if the data burst allocation information transmitted in the DL subframe # 1 indicates a long TTI transmission of the UL, the data burst corresponding to 1 starts transmission in the frame # 0 of the jth frame, ) feedback on the data burst is transmitted in time l DL sub-frame of the frame number k. If the HARQ feedback is NACK, the HARQ retransmission starts in the UL subframe of the pth frame. Here, the frame indices j, k, and p are calculated using the equations defined in Table 4 using the HARQ transmission offset v considering the m = 0 and the HARQ feedback offset w.

In the FDD mode, the DL subframe and the UL subframe are continuously provided in different frequency bands, so that a long TTI transmission can start in any subframe. However, when the long TTI start position is limited to a specific subframe in consideration of the implementation complexity, control information (e.g., resource allocation information, HARQ feedback information) may be transmitted to a corresponding specific subframe as in the TDD mode. Therefore, it is necessary to re-adjust the HARQ timing similarly to the TDD mode.

The following HARQ timing can be considered when the long TTI transmission for the FDD system DL HARQ operation is defined to start in the subframe x which is a specific DL subframe. A long TTI transmission includes one or more DL subframes (x ₁ , x ₂ , ... x _max ). Consider N _A-MAP = 1 here. That is, when the instruction is the long TTI data burst allocation information transmitted in the DL sub-frame than the l ≠ x, corresponds to a long TTI transmission time is later l sub-frame, starting from the available DL subframe long TTI transmission.

If as described above, if the instruction to l times the data long TTI transmission of burst allocation information is DL transmission in the DL subframes, l = x is the sub-frame index for the HARQ operation, m, n and the frame index j <Table 1 &Gt; On the other hand, if l ? X, the transmission of the data burst corresponding to the data burst allocation information starts in the frame m times. The feedback to the data burst is transmitted in the nth subframe of the jth frame, where m , n and j are determined according to Equation (16) instead of Table 1. [ That is, the position ( n , j ) at which the HARQ feedback is transmitted is determined using the DL subframe index ( l ) to which the data burst allocation information is provided, the x subframe index to which the burst is transmitted, and the frame index.

Where x _n ⁱ denotes the x _n th subframe of the i th frame, and l = 0, 1, ..., F-1.

For example, consider the example where the start of a long TTI transmission is limited to 0 and 4 DL subframes, F = 8, N _TTI = 4, and the transmission and reception processing time is 3 subframes. The long TTI transmission indicated by the data burst allocation information provided in any one DL subframe (i.e., x ₂ = 4) of the i-th frame is the 4 DL subframe (m = 4 ) And the corresponding HARQ feedback is transmitted in the nth UL subframe of the (i + 1) th frame (where n is 5 to 7). Here, since (ceil (8/2) -4 + 3) is not smaller than 3, z = 0. The long TTI transmission indicated by the data burst allocation information provided in the 5th to 7th DL sub-frames of the i-th frame starts at the 0th DL sub-frame (m = 0) of the (i + 1) HARQ feedback is transmitted in n subframes (n = 1 to 3) of the (i + 2) -th frame. Here, since (ceil (8/2) -4-5) is smaller than 3, z = 1.

When the long TTI transmission for the UL HARQ operation of the FDD mode is limited to start in the y subframe that is the specific UL subframe, similar HARQ timing as described above can be considered as follows. The long TTI transmission includes one or more UL subframes (y ₁ , y ₂ , ... y _max ).

In this case, when the data burst allocation information transmitted in the DL subframe # 1 indicates the long TTI transmission of the UL, if n is equal to y, the subframe index m and the frame index j in which the HARQ burst transmission is performed are As shown in Table 2. On the other hand, if n ? Y, the UL data burst transmission corresponding to the data burst allocation information is performed in the m- th UL subframe. That is, the transmission of the data burst is instructed in the m-th UL sub-frame of the j-th frame. The HARQ feedback for the data burst is transmitted in DL subframe # 1. If the HARQ feedback is a NACK or a resource allocation for retransmission is instructed, the HARQ retransmission starts in the m subframe of the pth frame. Here, m and j, k, and p are defined in accordance with Equation (17) instead of Equation (2). That is, the transmitted position (m, j ) at which the HARQ sub-burst is transmitted is determined by using the DL sub-frame index l , the y sub-frame index and the frame index i to which the burst is transmitted, .

Here, the frame indices j, k, and p are calculated using the equations defined in Table 2 using the HARQ transmission offset v considering m = 0 and the HARQ feedback offset w.

Here, y _n ⁱ represents the y _n sub-frames of the i- _th frame, and l = 0, 1, ..., F-1.

For example, the start of a long TTI transmission is limited to 0 and 4 UL subframes (i.e., y ₁ = 0, y ₁ = 4), F = 8, N _TTI = 4, Considering the example of 3 subframes. The long TTI transmission indicated by the resource allocation information provided in any DL subframe (i.e., 1? l? 3, i.e., 5? n? 7) 0 &lt; / RTI &gt; UL sub-frame (m = 0), and the corresponding HARQ feedback is transmitted in any one of DL subframes 1 through 3 of the (i + 2) th frame. Since (ceil (8/2) -1 + 0-n) is smaller than 3, v = 1 and w = 0 since (floor (8/2) -4 + n-0) is not smaller than 3. Further, the long TTI transmission indicated by the data burst allocation information provided in any one of DL subframes 5 to 7 of the i-th frame (i.e., 5? L? 7, 1 ? N? 3) (M = 4) of the 4th UL subframe of the (i + 2) th frame, and the corresponding HARQ feedback is transmitted in the 1 th subframe of the i + 2th frame (1 is 5 to 7). When HARQ feedback is NACK or resource allocation for retransmission is instructed, HARQ retransmission starts in UL subframe # 4 of i + 3 frame. Since (ceil (8/2) -1 + 4-n) is not smaller than 3, v = 0 and w = 1 since (floor (8/2) -4 + n-4) is smaller than 3.

In another embodiment, when the data burst allocation information is transmitted in all DL subframes, the allocation information transmission period N _A-MAP = 1 is established, and Tables 1 to 4 are shown in Tables 5 to 8 8>. The following table is used to determine the transmission time point of at least one of the HARQ subpacket including the HARQ subpacket including the data burst allocation information and the HARQ subpacket including the data burst and the HARQ feedback and the HARQ retransmission subpacket including ACK and / or NACK. And it is needless to say that the present invention is not limited by the following table.

As an example, when each super frame is composed of four frames as shown in FIG. 1, the value of N is 4 in Tables 5 to 8. Also, when D and U are the same in HARQ feedback in UL of Table 7 and HARQ Subpacket Tx in UL of Table 8, the value of n is the same even if any formula is used. That is, n = m-k.

As another embodiment, a transmitter and a receiver may be provided with a table including the result values according to the equations of Tables 4 to 8 for all possible input values, and a desired result value may be read from the table, Of course, can be determined.

In other embodiments, the FDD DL HARQ timing, the FDD UL HARQ timing, the TDD DL HARQ timing, and the TDD UL HARQ timing relationship in the case of the default TTI and the long TTI mentioned above are summarized in Table 9 to Table 12 below. .

As another embodiment, a transmitter and a receiver may be provided with a table including result values according to the formulas of Table 9 to Table 12 for all possible input values, and a desired result value may be read from the table, Of course, can be determined.

As another example, the above-described UL HARQ operation timing is applicable to a channel having a relation of resource allocation and a corresponding UL transmission. For example, in the case of an UL fast feedback channel, the base station transmits resource allocation information for UL fast feedback in the 1 < th > subframe of the i < th > frame, and UL fast feedback information corresponding to the resource allocation information The transmitted timing, i. E. The frame index and the subframe index, is determined by using i and l . As a specific example, the frame index j and the subframe index m at which the UL fast feedback information is transmitted are determined by any one of Table 2, Table 4, Table 6, and Table 8 .

Although the DL subframe index and the UL subframe index are defined in each link interval in the description of the TDD system in this specification, the DL and UL subframe indexes may include one DL And can be continuously determined within the frame. In this case, the UL subframe index x is mapped to the subframe index D + x in the frame.

FIG. 18 and FIG. 19 show operation flows between a base station and a terminal for a DL and UL HARQ timing structure according to a preferred embodiment of the present invention, respectively.

Referring to FIG. 18, in step 1802, system configuration information is transmitted from a base station (BS) to a mobile station (MS). The system configuration information is broadcast from the base station or acquired through negotiation between the base station and the terminal to enable system access of the terminal. Specifically, the system configuration information is information necessary for operating the HARQ timing structure, and includes a bandwidth (total number of subframes), a number of subframes (D, U) of each link, a transmission / reception processing time of the base station, .

After the terminal acquires the system information through the system configuration information and accesses the base station, the base station and the terminal can perform data communication in step 1804. If the terminal knows the system configuration information in advance as described above, step 1804 may be omitted.

In step 1806, allocation information indicating or containing a frame index, a subframe index, a long TTI length, and MAP related relevance information for HARQ operation timing is transmitted from the BS to the MS. ) The terminal decodes the allocation information and extracts necessary information. In particular, the terminal calculates a frame index and a subframe index in which each HARQ operation is performed according to at least one of the above-described embodiments of the present invention, And the subframe index.

In step 1808, the base station transmits a DL HARQ burst in the h subframe of the frame a according to the allocation information, and the UE decodes the DL HARQ burst according to the allocation information. In step 1810, the HARQ feedback according to the decoded result is transmitted to the base station in subframe f of frame b.

In step 1812, the next allocation information may be transmitted in the h subframe of the c-th frame, which is the designated period. Also, if the HARQ feedback is detected as a NACK, the DL HARQ burst may be retransmitted in step 1814. FIG.

Referring to FIG. 19, in step 1902, system configuration information is transmitted from a base station (BS) to a mobile station (MS). After the terminal acquires the system information through the system configuration information and accesses the base station, the base station and the terminal can perform data communication in step 1904.

In step 1906, allocation information for indicating or indicating a frame index, a subframe index, a long TTI length, and MAP related information (relevance) for HARQ operation timing is transmitted from the base station to the mobile station. ) The terminal decodes the allocation information and extracts necessary information. In particular, the terminal calculates a frame index and a subframe index in which each HARQ operation is performed according to at least one of the above-described embodiments of the present invention, And the subframe index.

In step 1908, the UE transmits an UL HARQ burst in subframe h of frame a according to the allocation information, and the base station decodes the UL HARQ burst according to the allocation information. In step 1910, HARQ feedback or next allocation information according to the decoding result is transmitted to the UE in subframe f of frame b. If the HARQ feedback is detected as a NACK, the UL HARQ burst may be retransmitted in the h subframe of the c-th frame, which is the designated period in step 1912. [

In order to implement at least one of the embodiments of the present invention as described above, the base station or the terminal includes a controller configured with a processor and the like, a memory storing program codes and related parameters for operation of the controller, And a transceiver for exchanging signaling messages or data traffic with the other communication station. The controller controls HARQ timing for operation of the transceiver according to at least one of the embodiments described above.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (30)

A hybrid automatic repeat request (HARQ) operation method in a wireless mobile communication system using frames each composed of a plurality of subframes for communication,
step of in response to the i-th l downlink (DL) data burst allocation information in the subframe of the second frame, determines the HARQ timing including a transmission time of the DL data bursts and HARQ feedback for the HARQ DL transmission and,
And performing an HARQ operation according to the determined HARQ timing,
Wherein at least one frame index indicating the HARQ timing and at least one subframe index are determined by using the i and l .
2. The method of claim 1, wherein, when a frequency division multiplexing (FDD) scheme is used, the HARQ timing is determined by a table including result values according to the following formulas, .

Here, I denotes a subframe index in which an allocation A (Advanced) -MAP information element (IE) including the data burst allocation information is provided, i denotes a frame index in which the allocated A-MAP IE is provided, J is a frame index at which the HARQ feedback is transmitted, and F is a subframe index of a frame-by-frame subframe in which the transmission of the HARQ subpacket corresponding to the data burst starts. N is the number of superframe-based frames, 4 when each superframe is composed of 4 frames, and z is the DL HARQ feedback offset.
3. The method of claim 2, wherein the DL HARQ feedback offset z is determined according to a data burst processing time for the HARQ subpacket according to the following equation.

Here, ceil () denotes a ceiling function, N _TTI denotes the number of subframes occupied by the HARQ subpacket, and Rx_time denotes the data burst processing time.
3. The method of claim 2, wherein the retransmission of the data burst corresponding to the HARQ feedback comprises:
And starting at the same sub-frame index m after a predetermined number of frames from transmission of the data burst.
3. The method of claim 2, wherein the performing the HARQ operation comprises:
Transmitting, by the base station, the HARQ subpacket to the mobile station, starting from an m-th DL sub-frame of the i-th frame;
And receiving, by the Node B, the HARQ feedback for the HARQ subpacket from the UE through an n-th UL sub-frame of the j-th frame.
3. The method of claim 2, wherein the performing the HARQ operation comprises:
Receiving, from a base station, the HARQ subpacket starting from an m-th DL sub-frame of the i-th frame;
And transmitting, by the UE, the HARQ feedback for the HARQ subpacket to the BS through an n-th UL sub-frame of the j-th frame.
2. The method of claim 1, wherein, in a frequency division multiplexing (FDD) scheme, when a long TTI transmission in which the data burst occupies two or more subframes is used, the HARQ timing is determined by the following equation , And is determined by a table including the results of the equations in the following table.

Here, I denotes a subframe index in which an allocation-MAP information element (IE) including the data burst allocation information is provided, i denotes a frame index in which the allocated A-MAP IE is provided, Where n is a subframe index in which the HARQ feedback is transmitted, j is a frame index at which the HARQ feedback is transmitted, F is the number of subframes per frame Where N is the number of superframe-based frames, 4 is the case where each superframe is composed of 4 frames, z is the DL HARQ feedback offset, and x _n ⁱ represents the x _n th subframe of the i th frame .
2. The method of claim 1, wherein when the time division multiplexing (TDD) scheme is used, the HARQ timing is determined according to the following table or determined by a table including result values according to the following formulas.

Each frame is composed of D subframes for downlink transmission and U subframes for uplink transmission, and 1 denotes an allocated Advanced (Advanced) -MAP information element (IE) including the data burst allocation information. I is a frame index in which the allocated A-MAP IE is provided, m is a sub-frame index in which the transmission of the HARQ sub-packet corresponding to the data burst starts J is a frame index at which the HARQ feedback is transmitted, N is the number of frames per super frame, and 4 is a case where each super frame is composed of four frames. (UD) / 2} if D is less than U and K = floor {(DU) / 2} if D is greater than or equal to U, and z is the DL HARQ feedback offset, .
9. The method of claim 8, wherein the DL HARQ feedback offset z is determined according to a data burst processing time of the HARQ subpacket according to the following equation.

N _TTI denotes the number of subframes occupied by the HARQ subpacket, and Rx_time denotes the data burst processing time.
9. The method of claim 8, wherein the retransmission of the data burst corresponding to the HARQ feedback starts at the same subframe index m after a predetermined number of frames from transmission of the data burst.
9. The method of claim 8, wherein the sub-frame indices l, m,
D is a range from 0 to D-1 when used as DL subframe indices, D is the number of DL subframes used in a section excluding a section supporting the legacy system in each frame,
U denotes a number of UL subframes used in an interval except for a period for supporting a legacy system in each frame,
Wherein the frame indexes are calculated using a subframe index order corresponding to an entire section including a section supporting a lagging system in each frame.
9. The method of claim 8, wherein the sub-frame indices l, m,
When used as DL subframe indices, refers to subframe indexes rearranged with respect to DL subframes used for communication from a corresponding relay station to a terminal,
When used as UL subframe indices, refers to subframe indexes rearranged on UL subframes used for communication from the terminal to the corresponding relay station,
Wherein the frame indexes are calculated using a subframe index sequence corresponding to an entire interval used for communication with the corresponding RS in each frame.
The method as claimed in claim 8, wherein the performing the HARQ operation comprises:
Transmitting, by the base station, the HARQ subpacket to the mobile station, starting from an m-th DL sub-frame of the i-th frame;
And receiving, by the Node B, the HARQ feedback for the HARQ subpacket from the UE through an n-th UL sub-frame of the j-th frame.
The method as claimed in claim 8, wherein the performing the HARQ operation comprises:
Receiving, from a base station, the HARQ subpacket starting from an m-th DL sub-frame of the i-th frame;
And transmitting, by the UE, the HARQ feedback for the HARQ subpacket to the BS through an n-th UL sub-frame of the j-th frame.
The method according to claim 1,
In a time division multiplexing (TDD) scheme, when the assigned A-MAP IE including the data burst allocation information indicates a long TTI transmission and l is not 0, the transmission of the HARQ subpacket corresponding to the data burst th UL subframe of the (j + 1) th frame, the HARQ feedback for the HARQ subpacket is transmitted in the n'th UL subframe of the j'th frame,
Here, the long TTI transmission means that the HARQ subpacket occupies two or more subframes,
Wherein j 'and n' are determined according to the following equation or determined by a table including result values according to the following formulas.

A hybrid automatic repeat request (HARQ) operation method in a wireless mobile communication system using frames each composed of a plurality of subframes for communication,
corresponding to the l th downlink (DL) data burst allocation information in the sub-frame of the i-th frame, the uplink (UL) includes a retransmission time of UL data burst and the data burst and the transmission time of the HARQ feedback for the HARQ transmission Determining a HARQ timing to be used for the HARQ process;
And performing an HARQ operation according to the determined HARQ timing,
Wherein at least one frame index indicating the HARQ timing and at least one subframe index are determined by using the i and l .
17. The method of claim 16, wherein, when a frequency division multiplexing (FDD) scheme is used, the HARQ timing is determined by a table including the result values according to the following table, .

Here, I denotes a subframe index in which an allocation A (Advanced) -MAP information element (IE) including the data burst allocation information is provided, i denotes a frame index in which the allocated A-MAP IE is provided, J is a frame index at which the HARQ subpacket is transmitted, F is the number of subframes per frame, and N is the number of frames per superframe 4 is a case where each superframe is composed of four frames, and k is a frame index at which the HARQ feedback is transmitted.
18. The method of claim 17, wherein the UL HARQ transmission offset z and the UL HARQ feedback offset w are determined according to a data burst processing time of the HARQ subpacket according to the following equation, Gt; HARQ &lt; / RTI &gt;

Here, ceil () denotes a ceiling function, floor () denotes a floor function, N _TTI denotes a number of subframes occupied by the HARQ subpacket, and Rx_time denotes the data burst processing time.
18. The method of claim 17, wherein a time point at which retransmission of the data burst corresponding to the HARQ feedback starts is determined by a table including the result values according to the following table, Way.

Here, p denotes a frame index at which retransmission of the HARQ subpacket starts when the HARQ feedback indicates NACK, v denotes a UL HARQ transmission offset, and w denotes a UL HARQ feedback offset.
The method as claimed in claim 17, wherein the performing the HARQ operation comprises:
Receiving, from a mobile station, the HARQ subpacket starting from an m-th UL sub-frame of the j-th frame;
The process of transmitting the HARQ feedback for the HARQ sub-packets to the mobile station the base station, through the l-th DL sub-frame of the k-th frame,
And a step in which the BS receives retransmission of the HARQ sub-packet from the MS, starting from an m-th UL sub-frame of the p-th frame.
The method as claimed in claim 17, wherein the performing the HARQ operation comprises:
Transmitting, by the UE, the HARQ subpacket to the base station starting from an m-th UL sub-frame of the j-th frame;
Receiving, by the UE, the HARQ feedback for the HARQ subpacket from the BS through a 1 &lt; th &gt; DL subframe of the k &lt;
And the UE retransmitting the HARQ sub-packet to the BS starting from an m-th UL sub-frame of the p-th frame.
17. The method of claim 16, wherein, in a frequency division multiplexing (FDD) scheme, when a long TTI transmission in which the data burst occupies two or more subframes is used, the HARQ timing is determined by the following equation, Gt; HARQ &lt; / RTI &gt;

Here, I denotes a subframe index in which an allocation-MAP information element (IE) including the data burst allocation information is provided, i denotes a frame index in which the allocated A-MAP IE is provided, Where n is a subframe index in which the HARQ feedback is transmitted, j is a frame index at which the HARQ feedback is transmitted, F is the number of subframes per frame Where N is the number of superframe-based frames, 4 is a case where each superframe is composed of 4 frames, z is a DL HARQ feedback offset, and p is the number of HARQ sub- V denotes an UL HARQ transmission offset, w denotes an UL HARQ feedback offset, and _yn ⁱ denotes a y _n subframe of the i- _th frame.
18. The method of claim 16, wherein when a time division multiplexing (TDD) scheme is used, the HARQ timing is determined according to the following table or determined by a table including result values according to the following formulas: .

Each frame is composed of D subframes for downlink transmission and U subframes for uplink transmission, and 1 denotes an allocated Advanced (Advanced) -MAP information element (IE) including the data burst allocation information. I is a frame index in which the allocated A-MAP IE is provided, m is a sub-frame index in which the transmission of the HARQ sub-packet corresponding to the data burst starts K is the number of superframe-based frames, k is 4 when each superframe is composed of four frames, k is a frame index at which the HARQ subframe is transmitted, (UD) / 2} if D is less than U and K = (UD) / 2 if D is greater than or equal to U, where v is the UL HARQ transmission offset and w is the UL HARQ feedback offset, floor {(DU) / 2}.
24. The method of claim 23, wherein the UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to a data burst processing time for the HARQ subpacket according to the following equation.

Here, N _TTI means the number of subframes occupied by the HARQ subpacket, and Tx_time and Rx_Time mean the data burst processing time.
24. The method of claim 23, wherein a retransmission time of the data burst corresponding to the HARQ feedback is determined according to the following table.

Here, p denotes a frame index at which retransmission of the HARQ subpacket starts when the HARQ feedback indicates NACK.
24. The method of claim 23, wherein the sub-frame indices l, m,
D is a range from 0 to D-1 when used as DL subframe indices, D is the number of DL subframes used in a section excluding a section supporting the legacy system in each frame,
U denotes a number of UL subframes used in an interval except for a period for supporting a legacy system in each frame,
Wherein the frame indexes are calculated using a subframe index order corresponding to an entire section including a section supporting a lagging system in each frame.
24. The method of claim 23, wherein the sub-frame indices l, m,
When used as DL subframe indices, refers to subframe indexes rearranged with respect to DL subframes used for communication from a corresponding relay station to a terminal,
When used as UL subframe indices, refers to subframe indexes rearranged on UL subframes used for communication from the terminal to the corresponding relay station,
Wherein the frame indexes are calculated using a subframe index sequence corresponding to an entire interval used for communication with the corresponding RS in each frame.
24. The method of claim 23, wherein the performing the HARQ operation comprises:
Receiving, from a mobile station, the HARQ subpacket starting from an m-th UL sub-frame of the j-th frame;
The process of transmitting the HARQ feedback for the HARQ sub-packets to the mobile station the base station, through the l-th DL sub-frame of the k-th frame,
And a step in which the BS receives retransmission of the HARQ sub-packet from the MS, starting from an m-th UL sub-frame of the p-th frame.
24. The method of claim 23, wherein the performing the HARQ operation comprises:
Transmitting, by the UE, the HARQ subpacket to the base station starting from an m-th UL sub-frame of the j-th frame;
Receiving, by the UE, the HARQ feedback for the HARQ subpacket from the BS through a 1 &lt; th &gt; DL subframe of the k &lt;
And the UE retransmitting the HARQ sub-packet to the BS starting from an m-th UL sub-frame of the p-th frame.
17. The method of claim 16,
In the time division multiplexing (TDD) scheme, when the allocated A-MAP IE indicates a long TTI transmission, the transmission of the HARQ subpacket corresponding to the data burst starts in the 0th UL subframe of the jth frame , the HARQ feedback for the HARQ sub-packet is transmitted in the l-th UL sub-frame of the k th frame, retransmission of the HARQ sub-packet starts from the 0-th UL sub-frame of the p-th frame,
Wherein the long TTI transmission means that the HARQ subpacket occupies two or more subframes.

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