JP5336612B2 - Method for performing hybrid automatic repeat request operation in wireless mobile communication system - Google Patents

Abstract

A method for performing a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system that uses Frequency Division Duplex (FDD) or Time Division Duplex (TDD) frames each having a plurality of subframes for communication are provided, in which an HARQ timing including a transmission time of a data burst and a transmission time of an HARQ feedback, for DL HARQ is determined according to data burst assignment information transmitted in a #l DownLink (DL) subframe of a #i frame, and an HARQ operation is performed according to the determined HARQ timing. At least one frame index and at least one subframe index that represent the HARQ timing are determined by using l and i.

Description

  The present invention relates to a radio mobile communication system, and more particularly to a method for performing a hybrid automatic repeat request (hereinafter referred to as “HARQ”) operation in a radio mobile communication system.

  Wireless mobile communication systems have evolved to support various services such as broadcasting services, multimedia video services, multimedia messaging services, and so on. In particular, the next generation wireless mobile communication system is developed to provide a data service of 100 Mbps or more to a user moving at high speed and to provide a data service of 1 Gbps or more to a user moving at low speed. Yes.

  In a wireless mobile communication system, in order to transmit and receive highly reliable data between a base station (BS) and a terminal (Mobile Station: MS) at high speed, a reduction in control overhead and a short latency ( latency) is required. In order to reduce control overhead and support short latencies, Hybrid Automatic Repeat reQuest (HARQ) techniques may be applied.

  In a wireless mobile communication system that implements the HARQ scheme, when a transmitter transmits a signal for carrying data, an acknowledgment (ACK) signal or a negative response indicating that the receiver has successfully received the signal. The (NACK) signal is fed back to the transmitter. When receiving the ACK or NACK signal, the transmitter initially transmits new data or retransmits the transmitted data according to the HARQ scheme. The HARQ scheme can be classified into two types, that is, a Chase Combining (CC) scheme and an Incremental Redundancy (IR) scheme.

  Since the transmission / reception operation is performed in units of frames during the HARQ operation, the latency is not reduced. Therefore, there is an increasing need for a new frame structure that shortens signal transmission and reception latency and a HARQ operation timing structure for realizing the new frame structure.

  Accordingly, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a method for controlling a hybrid automatic repeat request (HARQ) operation in a wireless mobile communication system.

  Another object of the present invention is to provide a method for determining transmission timing of a data burst, transmission of a HARQ feedback signal for the data burst, and retransmission of the data burst in a wireless mobile communication system.

  It is another object of the present invention to provide a method for flexibly determining HARQ operation timing according to a data burst transmission time interval and system performance in a wireless mobile communication system.

  To achieve the above object, according to an aspect of an embodiment of the present invention, a hybrid automatic repeat request (HARQ) in a wireless mobile communication system that uses a frame each having a plurality of subframes for communication. Provide a way to perform an action. The above method determines HARQ timing including DL data burst transmission time and HARQ feedback transmission time for DL HARQ according to data burst allocation information transmitted in #l downlink (DL) subframe of #i frame. And performing HARQ operation according to the determined HARQ timing, wherein at least one frame index and at least one subframe index indicating the HARQ timing are determined by using l and i. It is characterized by being.

  According to another aspect of an embodiment of the present invention, a method for performing a hybrid automatic repeat request (HARQ) operation in a wireless mobile communication system that uses a frame each having a plurality of subframes for communication is provided. According to the data burst allocation information transmitted in the #l downlink (DL) subframe of the #i frame, the above method transmits a UL data burst for uplink (UL) HARQ, a transmission time of HARQ feedback, and Determining HARQ timing including a retransmission time point of the data burst; and performing HARQ operation according to the determined HARQ timing, wherein at least one frame index indicating the HARQ timing and at least one sub The frame index is determined by using l and i.

  Embodiments of the present invention provide different frame configuration methods for different system bandwidths, between downlink (DL) and uplink (UL), in order to flexibly set HARQ Tx timing in a wireless mobile communication system. Flexible HARQ transmissions can be enabled according to various ratios, legacy system support schemes.

  The synchronized relationship described above can minimize power waste by reducing the number of subframes that the receiver must monitor. Furthermore, the terminal has an advantage that it can communicate with other systems more freely by using a predefined operation timing.

FIG. 3 illustrates a frequency division duplex (FDD) superframe structure according to an embodiment of the present invention. FIG. 3 illustrates a time division duplex (TDD) superframe structure according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a hybrid automatic repeat request (HARQ) operation timing structure for FDD downlink (DL) data burst transmission according to an embodiment of the present invention; FIG. 5 is a diagram illustrating a HARQ operation timing structure for uplink (UL) data burst transmission of an FDD scheme according to an embodiment of the present invention; FIG. 6 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission of a TDD scheme according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission of a TDD scheme according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission of a TDD scheme when two different systems according to an embodiment of the present invention coexist. FIG. 5 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission of a TDD scheme when two different systems according to an embodiment of the present invention coexist. FIG. 9 is a diagram illustrating a HARQ operation timing structure for FDD DL data burst transmission according to another exemplary embodiment of the present invention. FIG. 6 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission of a TDD scheme according to another embodiment of the present invention. FIG. 6 illustrates a HARQ operation timing structure based on a ratio between DL and UL according to an embodiment of the present invention. FIG. 6 illustrates a HARQ operation timing structure based on a ratio between DL and UL according to an embodiment of the present invention. FIG. 6 illustrates a HARQ operation timing structure based on a ratio between DL and UL according to an embodiment of the present invention. FIG. 6 illustrates a HARQ operation timing structure based on a ratio between DL and UL according to an embodiment of the present invention. 1 is a diagram illustrating a frame structure of a wireless mobile communication system supporting a plurality of relay stations (RSs) according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a TDD relay station (RS) frame structure according to an embodiment of the present invention. FIG. 6 shows a HARQ operation timing structure for an odd-hop RS according to an embodiment of the present invention. FIG. FIG. 6 illustrates a HARQ operation timing structure for an even hop RS according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a signal flow for operation between a base station (BS) and a terminal (MS) according to a DL and UL HARQ timing structure according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a signal flow for operation between a base station (BS) and a terminal (MS) according to a DL and UL HARQ timing structure according to an embodiment of the present invention.

  Other objects, advantages and salient features of the present invention will become apparent to those skilled in the art from the accompanying drawings and the following detailed description made from the embodiments of the present invention. In the above drawings, it should be understood that the same drawing reference numerals mean the same elements, characteristics and structures.

  The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the embodiments of the present invention as defined in the appended claims and their equivalents, Various specific details are included to aid this understanding, but are merely embodiments. Accordingly, it will be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, from the viewpoints of clarity and conciseness, detailed descriptions of functions and configurations well known to those skilled in the art are omitted.

  The terms and words used in the following description and claims are not limited to the dictionary meaning, but are used by the inventor to make the understanding of the present invention clear and consistent. Accordingly, it is to be defined based on the following claims and their equivalents, and the description of the embodiments of the present invention is merely provided for illustrative purposes and is intended to limit the purpose of the present invention. It will be clear to those of ordinary skill in the art of the present invention.

  It is understood by those skilled in the art that “a”, “an”, and “the”, ie, the singular forms in the English specification, include the plural unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes one or more surfaces.

  Embodiments of the present invention include frequency division duplex (hereinafter referred to as “FDD”) mode, time division duplex (hereinafter referred to as “TDD”) mode, and half duplex. In a wireless mobile communication system operating in FDD (Half duplex-FDD: hereinafter referred to as “H-FDD”) mode, or in FDD mode and TDD mode, a hybrid automatic repeat request (Hybrid Automatic request) having a predetermined HARQ retransmission latency Repeat Request: hereinafter referred to as “HARQ”.) A method for executing the operation is proposed. In TDD mode or H-FDD mode, frames may be configured with various ratios between downlink (DL) and uplink (UL). Therefore, the correspondence between DL period and UL period may be symmetric or asymmetric in the frame.

  Hereinafter, a signal transmission / reception operation between a base station (BS) and a terminal (Mobile Station: MS) based on the superframe structure according to the HARQ scheme will be described. Each superframe includes one or more frames, and each frame includes one or more subframes. The term “subframe” may be used interchangeably with “time slot”. Each time slot or subframe includes one or more Orthogonal Frequency Division Multiple Access (OFDMA) symbols.

  In the embodiment, each of the base station and the terminal generates and analyzes data burst allocation information, determines a HARQ transmission time according to a frame structure and HARQ operation timing described later, and under the control of this controller At least one HARQ processor for generating and analyzing data bursts and HARQ feedback at a determined timing and a transceiver for transmitting and receiving the data burst allocation information, the data bursts, and HARQ feedback may be included. For example, the data burst allocation information may be transmitted as an Advanced MAP (A-MAP) information element (IE) indicating resource allocation, and the data burst is a HARQ subpacket generated according to the HARQ operation. It can be transmitted in the form of

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

  Referring to FIG. 1, the superframe 100 includes four frames, and each frame 110 has eight subframes. In the case of the FDD scheme, the DL subframe 120 used for transmission from the base station to the terminal and the UL subframe 130 used for transmission from the terminal to the base station have different frequency bands. Occupy.

  FIG. 2 is a diagram illustrating a structure of a TDD superframe according to an embodiment of the present invention.

  Referring to FIG. 2, the superframe 200 includes four frames, and each frame 210 includes eight subframes 220. In the TDD mode, a predetermined number of subframes among all subframes are used as DL subframes, and the remaining subframes are used as UL subframes. In the case of FIG. 2, the ratio between DL and UL is 5: 3, 5 DL subframes defined during the DL time period and 3 UL defined during the UL time period. Indicates a subframe. A transmission / reception switching gap (Transmit / receive Transition Gap: TTG) 230 is inserted between the DL subframe and the next UL subframe, and a reception / transmission switching gap (RTG) 240 is UL. It is inserted between the subframe and the next DL subframe.

  1 and 2, each superframe includes four frames, and each frame has eight subframes. However, the number N of frames per superframe and the number of subframes per frame are illustrated. F may vary based on the bandwidth (BW) and subcarrier spacing of the wireless mobile communication system. In an orthogonal frequency division multiplexing (OFDM) / OFDMA wireless mobile communication system having channel bandwidths of 5, 10, and 20 MHz, each frame has 8 subframes, In the OFDM / OFDMA wireless mobile communication system having a channel bandwidth of 8.75 MHz, the number of subframes per frame may be seven. In the OFDM / OFDMA wireless mobile communication system having a channel bandwidth of 7 MHz, the number of subframes per frame may be six. Also, for a given BW, the number of subframes per frame may vary according to the cyclic prefix (CP) length.

  In the HARQ scheme, the initial transmission timing and the retransmission timing may have an arbitrary correspondence relationship. Such a correspondence relationship is called a HARQ operation timing structure or HARQ interlace. This HARQ operational timing structure or HARQ interlace includes a relationship between a subframe carrying a MAP message containing resource allocation information (ie, control information) and a subframe carrying a signal associated with the subframe carrying the MAP message; It means a relationship between a subframe carrying this signal and a subframe carrying feedback for this signal, and a relationship between this feedback subframe and a subframe carrying initial transmission data or retransmission data according to this feedback. The HARQ operation timing structure or the HARQ interlace will be described in more detail as follows.

(1) Data burst allocation IE: indicates a DL data burst or UL data burst in a DL subframe.
(2) Data burst: The transmitter transmits a data burst using resources allocated according to the data burst allocation IE.
(3) HARQ feedback for received data burst: The receiver sends an acknowledge signal (Acknowledgement: ACK) or a negative signal (Negative-acknowledgement: NACK) according to whether an error is found in the received data burst.
(4) Initial transmission or retransmission of data burst according to HARQ feedback: The transmitter retransmits the data burst upon receipt of the NACK signal. At this time, the transmitter may additionally provide resource allocation information for retransmission. On the other hand, upon receipt of the ACK signal, the transmitter may initially transmit a new data burst.

  The HARQ scheme can be divided into asynchronous HARQ and synchronous HARQ. In the case of asynchronous HARQ, it is necessary to define the HARQ operation timing structure specified as (1), (2), and (3), while in the case of synchronous HARQ, (1) to ( A definition of the HARQ operation timing structure identified as 4) is required. In order to define such a HARQ operation timing structure, at least one DL subframe in the DL period needs to have a predetermined correspondence with at least one UL subframe in the UL period.

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

  FIG. 3 is a diagram illustrating an HARQ operation timing structure for FDD DL data burst transmission according to an embodiment of the present invention. As shown in FIG. 3, the HARQ operation timing structure for DL data burst transmission of the FDD scheme is designed based on the FDD frame structure shown in FIG. Here, the number N of frames per superframe is 4, the number F of subframes per frame is 8, and the transmission / reception processing time (Tx / Rx processing time) for a data burst is 3 subframes. , And DL HARQ feedback offset z is 0, and DL HARQ transmission offset u is 0. Here, the Tx processing time is defined as the time taken for the transmitter to transmit the next data after receiving the HARQ feedback, and the Rx processing time is transmitted after the receiver receives the data. Defined as the time it takes to complete.

  Referring to FIG. 3, the transmitter transmits data burst allocation information and DL data through the DL frequency band in the #l DL subframe (ie, the first DL subframe) 300 of the #i frame (ie, the i-th frame). Send a burst. Thereafter, the receiver sends HARQ feedback for DL data bursts through the UL frequency band in # 5 UL subframe 310 of the #i frame. If the HARQ feedback is a NACK signal, the transmitter retransmits the data burst in # 1 DL subframe 320 of # (i + 1) frame through the DL frequency band. For this retransmitted data burst, the receiver sends HARQ feedback through the UL frequency band in # 5 UL subframe 330 of # (i + 1) frame.

  Explaining the HARQ operation described above with reference to Table 1 below, the index n of the subframe carrying HARQ feedback is 5, which is determined by calculating {ceil (1 + 4) mod 8}, and the HARQ feedback The index j of the frame to carry is i, determined by calculating {i + floor (ceil (1 + 4) / 8) +0} mod 4, and the index k of the frame carrying the retransmission HARQ data burst is i + 1 Yes, determined by calculating {j + floor ((5 + 4) / 8) +0} mod 4. “Ceil” is a function that rounds up values after the decimal point in the calculated value, and “floor” truncates values below the decimal point in the calculated value.

  Table 1 shows an FDD DL HARQ operation timing structure according to an embodiment of the present invention. Table 1 below determines at least one transmission time among an allocation A-MAP with data burst allocation information, a HARQ subpacket carrying a data burst, a HARQ feedback (ACK or NACK), and a HARQ retransmission subpacket. Can be used for. However, it should be understood that Table 1 below should not be construed as limiting the present invention.

In Table 1 above, N means the number of frames per superframe. N is 4 when each superframe includes 4 subframes. F means the number of subframes per frame. For example, N = 4 and F = 8 for bandwidths of 5, 10, and 20 MHz. i, j, and k mean DL frame index or UL frame index. l denotes the index of the DL subframe carrying the data burst allocation information, m denotes the index of the DL subframe carrying the initial transmission data burst, and n carries the HARQ feedback for the received data burst. This means the index of the UL subframe to be performed. Z means DL HARQ feedback offset, and u means DL HARQ Tx offset. Here, z and u are shown as the number of frames. Therefore, i = 0, 1,. . . , N-1, j = 0, 1,. . . , N−1, l = 0, N _A-MAP,. . . , N _A-MAP (ceil (F / NA _-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 during which data burst allocation information is transmitted and is expressed as the number of subframes. This data burst allocation information is transmitted through a normal MAP message or an A-MAP message. When this data burst allocation information is transmitted for each DL subframe, N _A-MAP = 1. When this data burst allocation information is transmitted every two DL subframes, N _A-MAP = 2. In this case, l = 0, 2,. . . , 2 (ceil (F / 2) -1).

In the case of the FDD DL HARQ transmission and reception shown in FIG. 3, F = 8, N = 4, z = 0, and u = 0. The DL data burst allocation information transmitted in the #l DL subframe 300 of the #i frame indicates the #m DL subframe of the #i frame. When data burst allocation information is transmitted for each DL subframe (ie, N _A-MAP = 1), the data burst allocation information indicates a data burst transmission started in the DL subframe. That is, m = 1. On the other hand, when the data burst allocation information is transmitted every two DL subframes (ie, NA _-MAP = 2), the data burst allocation information in the #l DL subframe is # 1 or # (l + 1) Fig. 4 shows a data burst transmission starting in a DL subframe. That is, m is l or (l + 1). The related information indicating l or (l + 1) is included in this data burst allocation information.

The data burst indicated by this data burst allocation information may occupy one or more subframes. #M DL transmission time interval of data bursts initiated by sub-frame (Transmission Time Interval: TTI) _is indicated by _{N TTI.} That is, N _TTI means the number of subframes occupied by this data burst. For example, _NTTI can be preset or signaled by this data burst allocation information. If this data burst occupies one subframe, then N _TTI = 1, and if this data burst occupies 4 subframes, then N _TTI = 4.

  HARQ feedback for a data burst that starts transmission in the #m DL subframe of the #i frame is transmitted in the #n UL subframe of the #j frame. Here, according to the index m of the subframe carrying this data burst, n is determined as in Equation 1 below.

  The index j of the UL frame carrying HARQ feedback is determined according to the subframe index m and the frame index i of the data burst. At this time, the frame offset is generated by the time gap between the completion of data burst transmission and the transmission time of HARQ feedback. Here, the time gap shown as Gap1 is calculated by the following formula 2.

Here, N _TTI indicates the TTI of the data burst in the DL HARQ operation, and is expressed as the number of subframes, and F indicates the number of subframes per frame.

  In the FDD system, the link period is continuous, and Gap1 is determined according to the DL burst TTI and the number of subframes per frame regardless of the subframe index.

  In DL HARQ, the DL HARQ feedback offset z is set such that Gap1 described as Equation 2 is greater than or equal to the Rx processing time. For example, if Gap1 is greater than or equal to the Rx processing time, z = 0, while if Gap1 is less than the Rx processing time, z = 1. Here, the value of z is adjusted so that HARQ feedback is transmitted in subframes having the same index in the delayed frame. In practice, z is an offset expressed as the number of frames, which does not mean that the index of the subframe carrying the HARQ feedback is changed.

  When z is determined in this way, j is as shown in Equation 3 below.

  When the DL data burst is retransmitted by asynchronous HARQ, the retransmission time point of the DL data burst is indicated by a retransmission indicator included in the data burst allocation information. On the other hand, when the DL data burst is retransmitted by synchronous HARQ, the retransmission of the DL data burst is performed in the #m subframe of the #k frame. Referring to Table 1 above, the frame index k is determined based on the index j of the frame that carries HARQ feedback, and the index m of the subframe that carries the retransmission data burst is the sub-index for the previous transmission of the data burst. It is the same as the frame index. At this time, the frame offset is generated due to a time gap between the HARQ feedback transmission time and the data burst retransmission time. The time gap shown as Gap2 is determined by the following mathematical formula 4.

Here, N _{CTRL and TTI} indicate the TTI of HARQ feedback by DL HARQ operation, and F indicates the number of subframes per frame. In the FDD system, since the link period is continuous, Gap2 is determined by the UL HARQ feedback TTI and the number of subframes per frame regardless of the subframe index. In general, HARQ feedback occupies one subframe.

  In DL HARQ, the DL HARQ Tx offset u is set so that Gap2 in Equation 4 described above is greater than or equal to the Tx processing time. For example, u = 0 if Gap2 is greater than or equal to the Tx processing time, while u = 1 if Gap2 is less than the Tx processing time. Here, the value of u is adjusted so that the next HARQ data is transmitted in a delayed frame. In fact, u is an offset expressed as the number of frames, which does not mean that the index of the subframe carrying HARQ data is changed.

  When u is determined in this way, k becomes as shown in Equation 5 below.

  As described above, when the time required for processing the transmission signal is not secured, the HARQ retransmission time point may be delayed by one frame (ie, u = 1). Here 'time is enough. The symbol 'indicates that the time required for signal transmission processing (Tx processing time) and the time required for signal reception processing (Rx processing time) exceed known reference values. Here, this reference value is initially set or broadcast by the system.

  When the frame indices j and k are greater than or equal to the number N of frames per superframe, the superframe index is increased by 1, and the frame indices j and k are the modulo of equations 3 and 5. This is a value obtained by calculating (modulo). Referring to FIGS. 1 and 2, it can be considered that N = 4.

  Referring to Equations 2 and 4 above, the DL HARQ feedback offset z and the DL HARQ Tx offset u in FDD are the TTIs of HARQ operation (TTI or feedback of data burst), signal processing of the system (transmitter and receiver) Can be determined according to ability. Information about this signal processing capability can be preset or broadcast by the system. In another embodiment, z and u may be broadcast with system configuration information according to a system operation method.

  FIG. 4 is a diagram illustrating a HARQ operation timing structure for FDD UL data burst transmission according to an embodiment of the present invention. Here, assuming that the number N of frames per superframe is 4, the number F of subframes per frame is 8, and the Tx / Rx processing time is 3 subframes, UL HARQ feedback offset w is 0 and UL HARQ Tx offset v is 0.

  Referring to FIG. 4, when receiving data burst allocation information through the DL frequency band in the # 1 DL subframe 400 of the #i frame, the transmitter transmits the UL frequency band through the # 5 UL subframe 410 of the #i frame. Send a UL data burst. The receiver transmits HARQ feedback through the DL frequency band in the # 1 DL subframe 420 of the # (i + 1) frame according to whether the received data burst has an error. If the HARQ feedback is a NACK signal, the transmitter retransmits the data burst through the UL frequency band in # 5 UL subframe 430 of # (i + 1) frame. At this time, if the DL subframe 420 carries data burst allocation information indicating UL burst retransmission, the UL data burst retransmission is performed according to the data burst allocation information.

  The HARQ operation described above will be described with reference to Table 2 below. The index j of the frame carrying the UL data burst is i, determined by {i + floor (ceil (1 + 4) / 8) +0} mod 4, The index m of the subframe carrying the UL data burst is 5, determined by {ceil (1 + 4) mod 8}, and the index k of the frame carrying the HARQ feedback is i (j = i) +1, {J + floor ((5 + 4) / 8) +0} mod 4 is calculated. The index of the subframe carrying HARQ feedback is 1. If the HARQ feedback is a NACK signal, the index of the frame carrying the retransmitted HARQ data burst is i + 1, determined by (k + floor (ceil (1 + 4) / 8) +0) mod 4, and the retransmitted HARQ data burst The index m of the subframe that carries is 5. Table 2 below shows a UL HARQ operation timing structure of an FDD scheme according to an embodiment of the present invention. Table 2 below determines at least one transmission time in an allocation A-MAP with data burst allocation information, a HARQ subpacket carrying a data burst, a HARQ feedback (ACK or NACK), and a HARQ retransmission subpacket. Can be used to However, it should be understood that Table 2 below should not be construed as limiting the invention.

In Table 2, N indicates the number of frames per superframe. N is 4 where each superframe includes 4 frames. F indicates the number of subframes per frame. i, j, k, and p indicate DL frame index or UL frame index. l indicates the index of the DL subframe carrying the data burst allocation information, m indicates the index of the UL subframe where transmission of the data burst is started, w indicates the UL HARQ feedback offset, v is Indicates UL HARQ Tx offset. Here, w and v are indicated as the number of frames. Therefore, i = 0, 1,. . . , N-1, j = 0, 1,. . . , N-1, k = 0, 1,. . . , N-1, p = 0, 1,. . . , N−1, l = 0, N _A-MAP,. . . , N _A-MAP (ceil (F / NA _-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.

N _A-MAP indicates a period for transmitting data burst allocation information expressed as the number of subframes. When this data burst allocation information is transmitted for each DL subframe, N _A-MAP = 1. When this data burst allocation information is transmitted every two DL subframe intervals, N _A-MAP = 2. In this case, l = 0, 2,. . . , 2 (ceil (F / 2) -1).

In FDD UL HARQ transmission / reception, UL data burst allocation information transmitted in the #l DL subframe of the #i frame indicates data burst transmission started in the #m UL subframe of the #j frame. When data burst allocation information is transmitted every DL subframe (ie, N _A-MAP = 1), this data burst allocation information indicates a data burst transmission that starts in the #n UL subframe. That is, m = n. On the other hand, when data burst allocation information is transmitted every two DL subframes (ie, N _A-MAP = 2), the data burst allocation information in the #l DL subframe is #n UL subframe and ## (N + 1) Indicates a data burst transmission starting in the UL subframe. That is, m is n or (n + 1). Relevance information indicating n or (n + 1) is included in the data burst allocation information. Here, n is defined as n = ceil (l + F / 2) mod F.

The data burst indicated by the data burst assignment information may be transmitted through one or more UL subframes. The TTI of the data burst is indicated by _NTTI . N _TTI is signaled by data burst allocation information.

  HARQ feedback for a data burst that starts transmission in the #m UL subframe of the #j frame is transmitted in the #l DL subframe of the #k frame. That is, the data burst allocation information and HARQ feedback are transmitted in subframes having the same index. According to the subframe index m and the frame index j, the frame index k is determined as described in Table 2.

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

  When the UL data burst is retransmitted by asynchronous HARQ, the retransmission time of the UL data burst is indicated by the position of the data burst allocation information and the retransmission indicator included in the data burst allocation information. On the other hand, when the UL data burst is retransmitted considering synchronous HARQ, the UL data burst is retransmitted in the #m subframe of the #p frame. Referring to Table 2, the frame index p is determined according to the subframe index l and the frame index k.

The UL HARQ Tx offset v indicates a time interval expressed as the number of frames between the transmission point of DL burst allocation information or DL HARQ feedback and the transmission point of UL data burst. In Equation 2, UL HARQ Tx offset v, instead of _{N TTI} is the TTI of the DL data burst, considering Gap1 'calculated by applying the TTI of TTI or HARQ feedback of the data burst allocation information It is determined. Generally, this data burst allocation information or HATI feedback TTI is one subframe.

  In UL HARQ, the UL HARQ Tx offset v is set such that Gap1 'calculated as described above is greater than or equal to the Tx processing time. For example, if Gap1 'is greater than or equal to the Tx processing time, v = 0, while if Gap1' is less than the Tx processing time, v = 1.

  The UL HARQ feedback offset w indicates the time interval between the completion of UL data burst transmission and the transmission time of DL HARQ feedback of the UL data burst, and is expressed as the number of frames. In Equation 4, UL HARQ feedback offset w is determined considering Gap2 'calculated by applying TTI of UL data burst instead of HATI feedback TTI for DL HARQ operation.

  In UL HARQ, w is set so that Gap2 'is greater than or equal to the Rx processing time. For example, if Gap2 'is greater than or equal to the Rx processing time, w = 0, while if Gap2' is less than the Rx processing time, w = 1.

  As described above, the UL HARQ Tx offset v and UL HARQ feedback offset w are determined according to the TDD (data burst TTI or feedback) of HARQ operation and the signal processing capability of the system (transmitter and receiver) in FDD. Information about this signal processing capability can be preset or broadcast by the system. In another embodiment, the predetermined value may be broadcast as w and v through the system configuration information according to the system operation method. In Table 2 above, when the frame indexes j, k, and p are greater than or equal to N, the superframe index s is increased by 1, and the frame indexes j, k, and p are This is a value obtained by performing the modulo operation described in (1).

  In the TDD mode, each frame includes a DL subframe and a UL subframe. In an 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 by mapping DL subframes to UL subframes according to an arbitrary rule. Each region due to this link division includes one or more subframes and is mapped to one subframe of a link having a smaller number of subframes. That is, M subframes are divided into N regions (M> N), and each subframe has a predetermined mapping relationship according to an embodiment of the present invention. Detailed description regarding this mapping relationship will be described later.

  FIG. 5 is a diagram illustrating a DL HARQ operation timing structure in 5: 3 TDD mode according to an embodiment of the present invention. The DL HARQ operation timing structure is configured based on a TDD frame structure as shown in FIG.

  Referring to FIG. 5, the transmitter transmits the data burst allocation information and the DL data burst in the # 1 DL subframe 500 of the #i frame, and the receiver transmits the DL data in the # 0 UL subframe 510 of the #i frame. Send HARQ feedback for burst. The transmitter retransmits this data burst in # 1 DL subframe 520 of the # (i + 1) frame when the HARQ feedback is a NACK signal. At this time, in # 1 DL subframe 520, data burst allocation information indicating DL data burst transmission can be transmitted. For this retransmitted data burst, the receiver sends HARQ feedback in # 0 UL subframe 530 of the # (i + 1) frame.

  In the above description, the DL subframe and the UL subframe are individually indexed in the DL and UL periods. However, the DL subframe and the UL subframe may be sequentially indexed in one frame. In this case, the UL subframe index x is replaced with the subframe index D + x in the frame. Here, D indicates the duration (duration) of the DL period.

  The HARQ operation will be described with reference to Table 3 below. Table 3 illustrates a DL HARQ operation timing structure when DL: UL = D: U mode according to an embodiment of the present invention. Here, D indicates the duration of the DL period (that is, the number of DL subframes), and U indicates the duration of the UL period (that is, the number of UL subframes). Table 3 below shows at least one transmission time in an allocation A-MAP IE with data burst allocation information, a HARQ subpacket carrying a data burst, a HARQ feedback (ACK or NACK), and a HARQ retransmission subpacket. Can be used to determine. However, it should be understood that Table 3 below should not be construed as limiting the invention.

In Table 3 described above, D indicates the number of DL subframes per DL frame, U indicates the number of UL subframes per UL frame, and N indicates the number of frames per superframe. N is 4 where each superframe includes 4 frames. F indicates the number of subframes per frame, and therefore F = D + U. i, j, and k indicate frame indexes. l indicates the index of the DL subframe carrying data burst allocation information, m indicates the index of the subframe in which DL data burst transmission is started, and n is the subframe carrying HARQ feedback for the DL data burst. Indicates the index of. Z indicates a DL HARQ feedback offset, and u indicates a DL HARQ Tx offset. Therefore, j = 0, 1,. . . , N-1, k = 0, 1,. . . , N−1, l = 0, N _A-MAP,. . . , N _A-MAP (ceil (D / NA _-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.

N _A-MAP indicates a period during which data burst allocation information is transmitted. When this data burst allocation information is transmitted for each DL subframe, NA _-MAP is 1, and l has a range from 0 to D-1. When this data burst allocation information is transmitted at intervals of two DL subframes, N _A-MAP = 2. In this case, l = 0, 2,. . . , 2 (ceil (F / 2) -1).

The parameter K is defined according to the relationship between D and U. For example, K is defined as Equation 6 or Equation 7. System bandwidth to be considered by the system, processing period, based on the transmission period _{N A-MAP} data burst allocation information, K is, the _{K c} or _{K f.} Here, K _c means a value calculated using the ceiling function ceil (), and K _f means a value calculated using the floor function floor (). The determination of the K value depends on the system configuration. In general, K is K _f , but K _c can be used under the condition that F is odd and D <U / NA _-MAP .

K _c and K _f have zero or positive values when D is greater than or equal to U, and negative values otherwise.

In general, if F is an even number, the ceil () and floor () functions perform operations in the same manner, and thus K _c and K _f have the same value. According to other embodiments, K may be set as follows. When D <U, K = −ceil {(UD) / 2}, and when D ≧ U, K = floor {(DU) / 2}.

In DL HARQ transmission / reception in the TDD mode, DL data burst allocation information transmitted in the #l DL subframe of the #i frame indicates data burst transmission started in the #m DL subframe of the #i frame. When data burst allocation information is transmitted for each DL subframe (ie, N _A-MAP = 1), this data burst allocation information indicates a data burst transmission initiated in the DL subframe. That is, m = 1. On the other hand, when the data burst allocation information is transmitted every two DL subframes (ie, N _A-MAP = 2), the data burst allocation information in the #l DL subframe is # 1 DL subframe or # (L + 1) Indicates a data burst transmission started in the DL subframe. That is, m is l or (l + 1). Related information indicating l or (l + 1) is included in the data burst allocation information.

  The data burst indicated by this data burst allocation information may occupy one or more DL subframes.

  The HARQ feedback for the data burst whose transmission is started in the #m DL subframe of the #i frame is transmitted in the #n UL subframe of the #j frame. Here, n may be mapped to one or more DL subframe indexes according to the DL: UL (D: U) ratio. When D ≦ U, each UL subframe is mapped to one DL subframe. On the other hand, if D> U, each UL subframe is mapped to one or more DL subframes. As defined in Table 3, this subframe index n is determined according to K and m, and this frame index j is determined according to i and z. That is, Table 3 defines an arbitrary mapping relationship between the DL subframe index and the UL subframe index within one frame according to the DL: UL ratio. Table 1 shows that the case of D = U is included when D ≦ U. In other embodiments, K = 0 when D = U, so the case of D = U can be included not only when D ≦ U but also when D ≧ U. This specification explains the HARQ timing when the case of D = U is included in D ≦ U.

  As described with reference to the FDD DL HARQ timing structure in Table 1, z indicates the DL HARQ feedback offset. To ensure sufficient Rx processing time, z is used to adjust the index of the frame carrying the HARQ feedback. Since DL subframes alternate with UL subframes within one frame along the time axis, Gap3 calculated by Equation 8 below is used to determine DL HARQ feedback offset z.

Here, M _DATA indicates the number of subframes carrying a data burst, a indicates an index of a subframe where transmission of the data burst is started, N _TTI indicates a _TTI of the data burst, and b indicates , Indicate the index of the subframe carrying HARQ feedback for the data burst. Therefore, applying Table 3, M _DATA = D, a = m, and b = n.

  In DL HARQ in TDD mode, the DL HARQ feedback offset z is adjusted such that Gap3 described in Equation 8 is greater than or equal to the Rx processing time. For example, if Gap3 is greater than or equal to the Rx processing time, z = 0, while if Gap3 is less than the Rx processing time, z = 1.

  When the DL data burst is retransmitted by asynchronous HARQ, the retransmission of the DL data burst is indicated by a retransmission indicator included in the data burst allocation information. On the other hand, when the DL data burst is retransmitted by synchronous HARQ, the retransmission of the DL data burst is performed in the #m subframe of the #k frame. Referring to Table 3, the frame index k is determined by the index of the frame carrying the HARQ feedback and the DL HARQ Tx offset u. Further, when data burst allocation information indicating retransmission of a DL data burst is transmitted, this retransmission is performed based on the data burst allocation information.

  As described above with reference to the FDD DL HARQ timing structure in Table 1, u indicates the DL HARQ Tx offset and is determined according to Gap4 calculated by Equation 9. Gap4 indicates a time gap between the HARQ feedback transmission time and the data retransmission start time in the TDD mode.

Here, M _CTRL indicates the number of subframes that carry HARQ feedback, b indicates the index of the subframe that carries HARQ feedback, and a starts retransmission of data bursts after HARQ feedback Indicates the index of the subframe. Therefore, in Table 3, M _CTRL = U, b = n, and a = m.

  In DL HARQ in TDD mode, the DL HARQ Tx offset u is adjusted such that Gap4 calculated by Equation 9 is greater than or equal to the Tx processing time. For example, u = 0 when Gap4 is greater than or equal to the Tx processing time, while u = 1 when Gap4 is less than the Tx processing time. Here, when u = 1, there is not sufficient time for processing the transmission signal, and therefore, the HARQ retransmission time point is delayed by one frame.

  In Table 3, if the frame indices j and k are greater than or equal to the total number N of frames per superframe, the superframe index s is increased by 1, and the frame indices j and k are It is a value obtained by performing the modulo operation shown.

  As another embodiment of the present invention, the DL HARQ feedback offset z and the DL HARQ Tx offset u are the mapping relationship between the DL subframe and the UL subframe, the TTI of HARQ operation (TTI or feedback of data burst), and / or Determined according to the signal processing performance of the system.

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

  Referring to FIG. 6, when the data burst allocation information is received in the # 1 DL subframe 600 of the #i frame, the transmitter transmits the UL data burst in the # 0 UL subframe 610 of the #i frame. The receiver transmits HARQ feedback for the UL data burst in # 1 DL subframe 620 of the # (i + 1) frame according to whether or not the received data burst has an error. If the HARQ feedback is a NACK signal, the transmitter retransmits the data burst in # 0 UL subframe 630 of # (i + 1) frame. When the # 1 DL subframe 620 carries data burst allocation information indicating retransmission of UL data bursts, UL data burst retransmission is performed according to the data burst allocation information.

  In the above description, the DL subframe and the UL subframe are individually indexed in the DL and UL periods. However, the DL subframe and the UL subframe may be sequentially indexed in one frame. In this case, the UL subframe index x is replaced with the subframe index D + x in the frame. Here, D indicates the duration of the DL period.

  Table 4 shows a UL HARQ operation timing structure in TDD mode according to an embodiment of the present invention. Table 4 below determines at least one transmission time in the allocation A-MAP with data burst allocation information, HARQ subpacket carrying data burst, HARQ feedback (ACK or NACK), and HARQ retransmission subpacket. Can be used to However, it should be understood that Table 4 below should not be construed as limiting the invention.

In Table 4, D indicates the number of DL subframes per DL frame, U indicates the number of UL subframes per UL frame, and K is a parameter defined as Equation 6 or Equation 7. Yes, N indicates the number of frames per superframe. N is 4 if each superframe includes 4 frames. i, j, k, and p denote frame indexes. l indicates the index of the DL subframe carrying the data burst allocation information, m indicates the index of the subframe where transmission of the data burst is started, w indicates the UL HARQ feedback offset, and v indicates the UL Indicates the HARQ Tx offset. Therefore, i = 0, 1,. . . , N-1, j = 0, 1,. . . , N-1, k = 0, 1,. . . , N-1, p = 0, 1,. . . , N−1, l = 0, N _A-MAP,. . . , N _A-MAP (ceil (D / NA _-MAP ) -1), m = 0, 1,. . . , U-1, w = 0, 1,. . . , W _max −1, and v = 0, 1,. . . , V _max −1.

N _A-MAP indicates a period during which data burst allocation information is transmitted. When this data burst allocation information is transmitted for each DL subframe, N _A-MAP = 1, and l has a range from 0 to D-1. When this data burst allocation information is transmitted every two DL subframe intervals, N _A-MAP = 2. In this case, l = 0, 2,. . . , 2 (ceil (D / 2) -1).

In UL HARQ transmission / reception in the TDD mode, UL data burst allocation information transmitted in the #l DL subframe of the #i frame indicates transmission of a data burst started in the #m UL subframe of the #j frame. Here, m may be mapped to one or more DL subframes according to the ratio of DL: UL (D: U) and the allocation information period NA _-MAP . If ceil (D / NA _-MAP ) ≧ U, that is, the number of DL subframes carrying DL control information (data burst allocation information or HARQ feedback) is greater than or equal to the number of UL subframes. In some cases, each UL subframe is mapped to one or more DL subframes. On the other hand, if ceil (D / NA _-MAP ) <U, that is, if the number of DL subframes carrying DL control information (data burst allocation information or HARQ feedback) is less than the number of UL subframes, Each DL subframe is mapped to one or more UL subframes.

When the number of DL subframes carrying data burst allocation information is greater than or equal to the number of UL subframes (ceil (D / NA _-MAP ) ≧ U), data bursts in one UL subframe A transmission may be indicated in one or more DL subframes. That is, when l is smaller than K, the data burst allocation information in the #l DL subframe indicates data burst transmission started in the # 0 UL subframe. If l is greater than or equal to K and l is less than U + K, the data burst allocation information in the #l DL subframe is a data burst transmission starting in the # (l-K) UL subframe. Show. If l is greater than or equal to U + K, the data burst allocation information in the #l DL subframe indicates a data burst transmission that starts in the # (U-1) UL subframe.

On the other hand, when the number of DL subframes carrying data burst allocation information is smaller than the number of UL subframes (ceil (D / NA _-MAP ) <U), the data burst allocation information in the DL subframe is 1 Data burst transmission in one or more UL subframes may be indicated. For example, the data burst allocation information in the # 0 DL subframe indicates data burst transmission in the # 0 to # (1-K + NA _-MAP- 1) UL subframe, and related information regarding this is data burst allocation information. Sent through.

When this data burst allocation information is transmitted in only one DL subframe (ceil (D / NA _-MAP ) = 1), this DL subframe indicates data burst transmission in all UL subframes. . The TTI of this data burst can be indicated by the data burst allocation information, and the frame index j is determined according to i and v.

  As described with reference to the FDD UL HARQ timing structure in Table 2, v indicates a UL HARQ Tx offset and w indicates a UL HARQ feedback offset. The UL HARQ Tx offset v is used to determine when to transmit or retransmit a data burst after receiving data burst allocation information or HARQ feedback. As described above, the UL HARQ Tx offset v is used to adjust the index of the frame that carries the data burst to ensure sufficient Tx processing time.

In UL HARQ in TDD mode, UL HARQ Tx offset v is expressed in Equation 9 by replacing M _CTRL with the number D of DL subframes carrying control information such as data burst allocation information or HARQ feedback, and b as data burst allocation. It is determined according to Gap 4 ′ calculated by replacing the information or HARQ feedback with the subframe index l and substituting a with the subframe index m carrying the initial transmission or retransmission data burst.

  If Gap4 'is less than the Tx processing time required for data burst transmission after HARQ feedback is received, v = 1, otherwise v = 0.

Further, in the UL HARQ in TDD mode, in order to adjust the transmission time of the HARQ feedback after receiving the data burst, UL HARQ feedback offset w, in Equation _8, the number of sub-frames carrying the data burst _{M DATA} U It is determined according to Gap3 ′ calculated by substituting

  If Gap3 'is less than the Rx processing time required to send HARQ feedback after a UL data burst is received, w = 1, otherwise w = 0.

  HARQ feedback for the data burst transmitted in the #m UL subframe of the #j frame is performed in the #l DL subframe of the #k frame. That is, data burst allocation information and HARQ feedback are transmitted in subframes having the same index. Here, k is determined by j.

  When the UL data burst is retransmitted by asynchronous HARQ, the retransmission time of the UL data burst is indicated by a retransmission indicator included in the data burst allocation information. On the other hand, when the UL data burst is retransmitted in synchronous HARQ, the retransmission of the UL data burst is performed in the #m subframe of the #p frame. Referring to Table 4, the frame index p is determined by the UL HARQ Tx offset v and the index k of the frame carrying the HARQ feedback. When frame indices j, k, and p are greater than or equal to the total number N of frames per superframe, superframe index s is increased by 1, and frame indices j, k, and p are The value obtained by performing the modulo operation as shown in FIG.

  On the other hand, although it has been described above that the HARQ timing is determined using the equations of Tables 1 to 4, all the possible input values (that is, the number of DL / UL subframes, the subframe index, and the processing time) It is also possible to determine the HARQ timing by storing a table having a result value according to the formulas of Table 1 to Table 4 corresponding to each of the transmitter and the receiver and reading a desired result value from the table. Of course.

HARQ Feedback and Tx Offset Calculation An embodiment for calculating HARQ feedback offsets w and z and HARQ Tx offsets v and u will be described.

  HARQ feedback offsets w and z and HARQ Tx offsets v and u are the mapping relationship between DL subframes and UL subframes, TTI of HARQ operation (TTI or feedback of data burst), and / or system (transmitter and / or Or the signal processing performance of the receiver). In other embodiments of the present invention, the HARQ feedback offset may be preset and broadcast by the system instead of being determined using this information. The offset associated with HARQ operation is defined as follows.

  At least one of HARQ feedback offset z and HARQ Tx offset u for DL HARQ operation according to FDD mode is calculated according to Equation 10 below.

Here, Rx_Time1 indicates the Rx processing time of the DL data burst determined by the processing capability of the receiver, and Tx_Time1 indicates the Tx processing time of the DL data burst determined by the processing capability of the transmitter. Rx_Time1 and Tx_Time1 are collectively referred to as a data burst processing time. Here, the Rx processing of the data burst includes, for example, multiple input multiple output (MIMO) Rx processing, demodulation, and decoding. Includes Tx processing of data bursts, eg, encoding, modulation, MIMO Tx processing. In DL HARQ, in general, a receiver is a terminal and a transmitter is a base station. Here, it is assumed that the HARQ feedback TTI is one subframe, and the data burst transmission time interval TTI is denoted by _NTTI .

  At least one of HARQ Tx offset v and HARQ feedback offset w for UL HARQ operation according to FDD mode is calculated according to Equation 11 below.

  Here, Rx_Time2 indicates the Rx processing time of the UL data burst determined by the processing capability of the receiver, and Tx_Time2 indicates the Tx processing time of the UL data burst determined by the processing capability of the transmitter. Rx_Time2 and Tx_Time2 are collectively referred to as a data burst processing time. In UL HARQ, in general, a receiver is a base station and a transmitter is a terminal.

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

  Here, Rx_Time3 and Tx_Time3 indicate the Rx processing time and Tx processing time of the DL data burst, respectively. Rx_Time3 and Tx_Time3 are collectively referred to as a data burst processing time.

  At least one of HARQ feedback offset w and HARQ Tx offset v for UL HARQ operation according to TDD mode is calculated according to Equation 13 below.

  Here, Rx_Time4 and Tx_Time4 indicate the Rx processing time and Tx processing time of the UL data burst, respectively. Rx_Time4 and Tx_Time4 are collectively referred to as the data burst processing time.

  In synchronous HARQ, the Tx processing time of UL HARQ operation varies depending on initial transmission and retransmission. That is, Tx_Time2 of Equation 11 and Tx_Time4 of Equation 13 may be replaced with Tx_Time_NewTx and Tx_Time_ReTx based on whether the data burst is transmitted initially or retransmitted. Here, Tx_Time_NewTx indicates the Tx processing time of the initial transmission data burst, and Tx_Time_ReTx indicates the Tx processing time of the retransmission data burst. As described above, even if the initial transmission data burst is encoded according to the data burst allocation information, the retransmission of the data burst is triggered by a NACK signal that can be encoded based on the encoded initial transmission data burst. Accordingly, the HARQ Tx offset can be adjusted while considering Tx processing times for initial transmission and retransmission differently.

  Also, according to retransmission triggering, the Tx processing time of a retransmission data burst may be Tx_Time_ReTx1 or Tx_Time_ReTx2. In this retransmission triggering method, two methods can be considered. In the first method, only the NACK signal is transmitted, and in the second method, the NACK signal and allocation information for retransmission are transmitted. Tx_Time_ReTx1 is used for the former case and Tx_Time_ReTx2 is used for the latter case.

Similarly, the UL HARQ Tx offset described in Table 2, Table 4, Equation 11, and Equation 13 may be individually adjusted as v _new and v _RxTx according to the Tx processing time of initial transmission or retransmission. Here, v _new is a UL HARQ Tx offset for the initial transmission data burst considering the Tx processing time of _{Tx_Time_NewTx} , and v _RxTx is a UL HARQ for retransmission data burst considering the Tx processing time of Tx_Time_ReTx. Tx offset.

Legacy supporting mode A wireless mobile communication system using IEEE (Institute of Electrical and Electronics Engineers) 802.16m Advanced Air Interface (AAI) uses IEEE 802. It can coexist with 16e legacy wireless mobile communication systems. Specifically, each 16m frame includes a DL subframe and a UL subframe, and a frame offset for compensating for a difference from the 16e frame. In this case, the TDD HARQ operation timing structure is based on the HARQ operation timing structure described in Table 3 and Table 4 according to the DL: UL ratio during the period in which the network node and the terminal operate in the IEEE 802.16m mode.

  The mapping relationship between the DL subframe and the UL subframe is determined according to a DL: UL ratio during a period in which the network node and the terminal operate in the IEEE 802.16m mode. In other words, the index and the number of subframes in the transmission period for the HARQ operation are determined according to the DL: UL ratio. However, since IEEE 802.16e mode and IEEE 802.16m mode coexist in one frame, the frame follows the total DL: UL ratio of the TDD system, not the DL: UL ratio during the period of operation in 16m mode. Indexed.

  In the TDD system, the number of DL subframes and the number of UL subframes are denoted by D ′ and U ′, respectively. The subframe indices l ', m', and n 'are numbered according to the DL: UL ratio of the TDD system, ie D': U '. Also, the number of DL subframes and the number of UL subframes during the period of operation in the 16m mode are denoted by D and U, respectively. The subframe indexes l ', m, and n are numbered according to D: U, which is a DL: UL ratio during a period of operation in the 16m mode.

  Table 3 and Table 4 show the HARQ operation timing in the period of operation in the 16m mode excluding the legacy period of operation in the 16e mode. However, the frame indices i, j, and k determined according to the HARQ feedback offset z or w and the HARQ Tx offset u or v use the subframe indices l ′, m ′, n ′ according to D ′: U ′. Numbered.

  FIG. 7 illustrates a HARQ operation timing structure by DL data burst transmission in 5: 3 TDD mode when two different systems according to an embodiment of the present invention coexist.

  Referring to FIG. 7, two DL subframes and a UL frequency division multiplexing (FDM) region are designated for a mode supporting a legacy system (ie, legacy supporting mode), and the subframe is a legacy supporting Further indexing is performed in the remaining link period excluding the link period for the mode. That is, in all TDD systems, the DL frame is composed of # 0 to # 4 DL subframes. Accordingly, during the period of operation in the 16m mode, # 2, # 3, and # 4 DL subframes are further numbered as # 0, # 1, and # 2, respectively. The UL period coexists with the DL period using FDM, and the 16m mode period occupies the entire UL period. Thus, a frame operating in 16m mode includes 3 DL subframes and 3 UL subframes.

  Referring to FIG. 7, since D = 3 and U = 3, K = 0. D ′ is 5 and U ′ is 3. In the TDD DL HARQ data burst transmission, the data burst allocation information and the data burst are transmitted in the # 0 DL subframe of the #i frame. HARQ feedback for this data burst is transmitted in the # 0 UL subframe of the #i frame. The retransmission of the HARQ data burst is performed in the # 0 DL subframe of the # (i + 1) frame, and the HARQ feedback for the retransmission data burst is transmitted in the # 0 UL subframe of the # (i + 1) frame. Here, each of the Tx and Rx processing times is regarded as two subframes.

  FIG. 8 is a diagram illustrating a HARQ operation timing structure by UL data burst transmission in 5: 3 TDD mode when two different systems according to an embodiment of the present invention coexist.

  Referring to FIG. 8, since D = 3 and U = 3 according to the frame structure of FIG. 7, K = 0. In TDD UL HARQ data burst transmission, data burst allocation information is transmitted in # 0 UL subframe of #i frame, and UL data burst is transmitted in # 0 UL subframe of #i frame according to this data burst allocation information. The The HARQ feedback of this UL data burst is transmitted in the # 0 DL subframe of the # (i + 1) frame, and the retransmission of this UL data burst is performed in the # 0 UL subframe of the # (i + 1) frame. At this time, data burst allocation information indicating UL data burst transmission can be transmitted in the # 0 DL subframe. Here, each of the Tx and Rx processing times is regarded as two subframes.

  On the other hand, in FIGS. 7 and 8, resources used in the IEEE 802.16e wireless communication system are allocated in a period corresponding to the frame offset.

  The proposed HARQ operation timing structure as shown in Table 1 to Table 4 is set according to the index of the subframe carrying the data burst allocation information or the index of the subframe starting transmission of the data burst, regardless of the TTI of the data burst. The Thus, since HARQ feedback is periodically transmitted in a given subframe using synchronous HARQ, the receiver saves power to monitor the reception of HARQ feedback while CLC (Co-located coexistence ) Can be efficiently supported.

Long TTI
In another embodiment of the present invention, when a data burst occupies two or more subframes, that is, when a long TTI is used, the HARQ feedback timing is the HARQ timing described in Tables 1 to 4. In order to support earlier ACK timing compared to the structure, instead of the index of the subframe in which this data burst transmission is started, it can be determined according to the index of the subframe in which the data burst transmission ends. Such timing determination can be used mainly for earlier ACK timing in asynchronous HARQ.

The HARQ feedback timing defined in Table 1 is adjusted as follows. The index of the subframe that carries HARQ feedback and the index of the frame are determined based on the index m ′ (= m + N _TTI −1) of the last subframe of the TTI, instead of the index m of the first subframe of the TTI. Is done.

FIG. 9 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in FDD mode according to another embodiment of the present invention. Here, it is assumed that N _TTI = 4, F = 8, each of Tx and Rx processing times is 3 or less subframes, DL HARQ feedback offset z is 0, and DL HARQ Tx offset u is 0. To do.

  Referring to FIG. 9, the data burst allocation information transmitted in the # 1 DL subframe of the #i frame is transmitted as a DL data burst in the TTI 900 from the # 1 DL subframe to the # 4 DL subframe in the #i frame. Indicates that The HARQ feedback for the DL data burst is transmitted in the # 0 UL subframe 910 of the # (i + 1) frame mapped to the # 4 DL subframe of the #i frame where the DL data burst transmission ends. That is, n = 0 (= ceil (1 + 4-1 + 4) mod 8) and j = i + 1 (= (i + floor (ceil (1 + 4-1 + 4) / 8) mod 4))). In synchronous HARQ, transmission of data burst 920 starts at the same subframe position as the previous data burst transmission, that is, the # 1 DL subframe of the # (i + 2) frame.

  As described above, in Tables 1 and 2, the HARQ feedback timing is the last in one or more subframes carrying a data burst instead of the index m of the first subframe in the subframe. It can be determined according to the subframe index m ′.

Similarly in the DL HARQ operation timing structure in TDD mode, the HARQ feedback timing is also the last sub-carrier carrying this data burst instead of the index m of the first sub-frame of the data burst for earlier ACK timing. The frame index m ′ (= m + N _TTI −1) can be determined by applying to Table 3.

FIG. 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, it is assumed that N _TTI = 4, D = 4, U = 4, each of Tx and Rx processing times is 3 or less subframes, and K = 0 and z = 0.

  Referring to FIG. 10, the data burst allocation information transmitted in the # 0 DL subframe of the #i frame is the transmission of DL data bursts in the TTI 1000 from the # 0 DL subframe to the # 3 DL subframe of the #i frame. Indicates. The HARQ feedback for this DL data burst is transmitted in # 3 UL subframe 1010 of #i frame mapped to # 3 DL subframe of #i frame according to Table 3. That is, n = 0 (= 3-0) and j = i (= (i + 0) mod 4). In synchronous HARQ, retransmission of the data burst 1020 after HARQ feedback is started at the same subframe position as the previous data burst transmission, that is, the # 0 DL subframe of the # (i + 2) frame.

  However, HARQ feedback timing is determined differently according to the DL: UL ratio and Tx / Rx processing time in the TDD HARQ operation timing structure for long TTI. As an example, when the Tx / Rx processing time is 3 subframes and the TTI occupies the entire DL period, the HARQ feedback timing for a long TTI (5 subframes) in the 5: 3 TDD DL HARQ operation will be described. To do.

  If the HARQ feedback timing is set according to the start of data burst transmission, HARQ feedback for the data burst whose transmission is started in the # 0 DL subframe is provided in the # 0 UL subframe of the next frame. On the other hand, if the HARQ feedback timing is set according to the end of the data burst transmission, HARQ feedback for the data burst whose transmission ends in the # 4 DL subframe is provided in the # 3 UL subframe of the next frame. . Therefore, when a long TTI is used in 5: 3 TDD DL HARQ, it is much faster for a long TTI by determining based on the transmission start time of this data burst than based on the transmission end time of this data burst. HARQ feedback timing is provided.

  As another example, HARQ feedback timing for a long TTI of four subframes in 4: 4 TDD DL HARQ will be described.

  If the HARQ feedback timing is set according to the start of data burst transmission, HARQ feedback for the data burst whose transmission is started in the # 0 DL subframe is provided in the # 0 UL subframe of the next frame. On the other hand, if the HARQ feedback timing is set according to the end of the data burst transmission, HARQ feedback for the data burst whose transmission ends in the # 3 DL subframe is provided in the # 3 UL subframe of the next frame. . Thus, the 4: 4 TDD DL HARQ differs from the 5: 3 TDD DL HARQ in that it is determined based on the transmission start time of the data burst rather than based on the transmission end time of the data burst. Faster HARQ feedback timing for is provided.

Therefore, in the embodiment of the present invention, an appropriate HARQ operation timing structure is selected according to the DL: UL ratio and the Tx / Rx processing time. Specifically, in determining the HARQ feedback timing in Tables 1 to 4, this determination includes at least one or more data carrying a data burst instead of the index m of the subframe in which the transmission of the data burst is started. This may be done based on the index m ′ (= m + N _TTI −1) of the last subframe in the subframe. Information regarding the HARQ operation timing structure may be signaled as system information via a DL common control channel, for example.

HARQ Feedback and Tx Offset Changes Another embodiment of the TDD mode DL and UL HARQ operation timing structures is described. Specifically, the change of the HARQ feedback offset and the HARQ Tx offset according to the position of the subframe carrying the DL or UL data burst will be described.

11 and 12 are diagrams illustrating the HARQ operation timing structure when N _A-MAP = 1 and D + U = 8.

  FIG. 11 is a diagram illustrating a HARQ operation timing structure when D: U = 5: 3 and the TTI is one subframe. Referring to FIG. 11, the HARQ feedback / Tx offset is 0 when the Tx / Rx processing time is 2 subframes. That is, because the transmission of each DL subframe can be completely processed in two subframes (because Gap3 and Gap4 exceed 2), the associated UL transmission will be sent to the next UL without time delay. Made in a period. Similarly, the transmission of each UL subframe can be fully processed within two subframes (ie, because Gap3 and Gap4 exceed 2), and the associated DL transmission is In the DL period.

  However, if the Tx / Rx processing time is 3 subframes, the HARQ UL Tx timing associated with the # 4 DL subframe is delayed by one frame. This is because three subframes are required for the transmission processing of the # 4 DL subframe, and therefore, in two subframes (= 5-4-1 + 2) that are intervals to the corresponding # 2 UL subframe. It is difficult to execute the UL transmission. As a result, the UL transmission in the # 2 UL subframe corresponding to the # 4 DL subframe is delayed by one frame and is therefore performed in the # 2 UL subframe of the next # (i + 1) frame.

  FIG. 12 is a diagram illustrating a HARQ operation timing structure when D: U = 3: 5 and TTI is one subframe. Referring to FIG. 12, the HARQ feedback / Tx offset is 0 when the Tx / Rx processing time is 2 subframes. However, Gap = 3-0-1-0 = 2 when the Tx / Rx processing time is 3 subframes. Therefore, the HARQ UL Tx timing in the # 0 UL subframe associated with the # 0 DL subframe is delayed by one frame. Since Gap = 5-4-1 + 2 = 2, the DL transmission timing in the # 2 DL subframe related to the # 4 UL subframe is delayed by one frame. This is because each gap is smaller than the Tx or Rx processing time.

  FIG. 13 is a diagram illustrating a HARQ operation timing structure when D + U = 7.

FIG. 13A shows a HARQ operation timing structure when D: U = 4: 3, N _A-MAP = 1, and TTI is one subframe. Referring to FIG. 13A, when the Tx / Rx processing time is 2 subframes, the HARQ feedback / Tx offset is 0. When the Tx / Rx processing time is 3 subframes, the HARQ UL Tx timing of the # 2 subframe corresponding to the # 3 DL subframe is 1 because Gap = 4-3-1 + 2 = 2. Delay one frame.

FIG. 13B is a diagram illustrating a HARQ operation timing structure when D: U = 3: 4, N _A-MAP = 1, and TTI is one subframe. Since D + U is an odd number and D <U, K _c (= −1) is used based on ceil (). Referring to FIG. 13B, when the Tx / Rx processing time is 2 subframes, the HARQ feedback / Tx offset is 0. On the other hand, when the Tx / Rx processing time is 3 subframes, the HARQ UL Tx timing of the # 0 UL subframe corresponding to the # 3 DL subframe is delayed by one frame.

FIG. 14 is a diagram illustrating a HARQ operation timing structure when N _A-MAP = 1 and D + U = 6.

  FIG. 14A shows a HARQ operation timing structure when D: U = 4: 2 and TTI is one subframe. Referring to FIG. 14A, when the Tx / Rx processing time is two subframes, the HARQ UL Tx timing related to the # 3 DL subframe is delayed by one frame. If the Tx / Rx processing time is 3 subframes, the HARQ DL Tx timing associated with the # 0 UL subframe is delayed by one frame and the HARQ UL associated with the # 1 and # 2 DL subframes And DL Tx timing is delayed by one frame. Also, the HARQ UL Tx timing related to the # 3 DL subframe is delayed by one frame.

  FIG. 14B is a diagram illustrating a HARQ operation timing structure when D: U = 3: 3 and the TTI is one subframe. Referring to FIG. 14B, when the Tx / Rx processing time is 2 subframes, the HARQ feedback / Tx offset is 0. However, if the Tx / Rx processing time is 3 subframes, the HARQ feedback / Tx offset is 1, which means 1 frame delay.

Relay Structure Hereinafter, a HARQ operation timing structure in a wireless mobile communication system that supports a relay structure will be described.

  When supporting the relay structure, the base station and the terminal communicate directly or through at least one relay station (RS). Relay stations between the base station and the terminal are classified into odd-hop RS (odd-hop RS) and even-hop RS (Even-Hop RS). Each relay station determines a HARQ Tx time point according to a frame structure and HARQ operation timing, which will be described later, and at least one transmission that transmits / receives data burst allocation information, data burst, and HARQ feedback at a timing controlled by this controller Receiver / receiver. Here, the data transmission indicates data transmission between the base station and the relay station or data transmission between the relay station and the terminal.

  In an embodiment of the present invention, a HARQ operation timing structure that operates in 16m mode of a relay station and a terminal will be described.

  FIG. 15 is a diagram illustrating a frame structure of a wireless mobile communication system that supports a relay structure according to a preferred embodiment of the present invention.

  Referring to FIG. 15, a base station frame 1410 includes a DL access area 1412 transmitted directly from the base station to the terminal, a DL transmission area 1414 transmitted from the base station to the terminal or the relay station, and a network encoded reception area. 1416, UL access area 1418 received from the terminal, and UL reception area 1420 received from the terminal or relay station. A gap (Gap) 1422 for transmission / reception switching is inserted between the Tx regions 1412 and 1414 and the Rx regions 1416, 1418, and 1420.

  The odd-hop relay station frame 1430 includes a DL access area 1432 transmitted to the terminal, a DL transmission area 1434 transmitted to the terminal or even-hop relay station, and a DL reception area 1444 received from the even-hop relay station or base station. A network encoded transmission region 1438, a UL reception region 1440 received from a terminal or even-hop relay station, and a UL transmission region 1442 transmitted from an even-hop relay station or base station. Gaps 1444, 1446, and 1448 for switching between transmission and reception are inserted between the Tx region 1434 and the Rx region 1436, between the Tx region 1438 and the Rx region 1436, and between the Tx region 1442 and the Rx region 1440. .

  The even hop relay station frame 1450 includes a DL access area 1452 transmitted to the terminal, a DL reception area 1454 received from the odd hop relay station, a DL transmission area 1456 transmitted to the odd hop relay station or terminal, and a network. It includes a coded reception area 1458, a UL transmission area 1460 transmitted to the odd hop relay station, and a UL reception area 1462 received from the terminal or the odd hop relay station. Gap 1464, 1466, 1468, and 1470 for switching between transmission and reception are between Tx region 1452 and Rx region 1454, between Tx region 1456 and Rx region 1454, between Tx region 1456 and Rx region 1458, Inserted between Tx region 1460 and Rx region 1462.

  As described above, the HARQ operation timing structure in the region where at least one relay station communicates with the terminal is similar to the HARQ operation in the legacy supporting mode described above, between the DL subframe and the UL subframe according to the subframe index. The mapping relationship is determined according to the DL: UL ratio in an area where at least one relay station communicates with the terminal within the frame of the corresponding relay station, and the frame index is determined according to this subframe index.

  FIG. 16 is a diagram illustrating an example of a TDD mode relay station frame structure according to an embodiment of the present invention. In FIG. 16, the TDD frame has a DL: UL ratio of 4: 4 (D ′: U ′ = 4: 4), and the network coding Tx / Rx region is omitted.

  Referring to FIG. 16A, in the #i frame used for the odd-hop relay station, the odd-hop relay station transmits the # 0, # 1, and # 2 DL subframes to the terminal or the lower relay station. Transmit and receive other DL subframes from the base station. The odd-hop relay station receives # 0 and # 1 UL subframes from the terminal, and transmits the other two UL subframes to the upper relay station or the base station.

  Referring to FIG. 16B, in the #i frame used for the even-hop relay station, the even-hop relay station is # 0 DL subframe located at the beginning of the DL period and # 1 located at the end. DL subframes are transmitted to the terminal, and two DL subframes located in the middle are received from the upper odd-hop relay station. The even-hop relay station receives # 0 and # 1 UL subframes located at the end of the UL period from the terminal, and transmits the remaining two UL subframes located at the beginning of the UL period to the upper odd-hop relay station. To do.

  FIG. 17 is a diagram illustrating a HARQ operation timing structure for an odd-hop relay station according to an embodiment of the present invention. In FIG. 17, D: U = 3: 2.

(A) of FIG. 17 is a diagram illustrating a HARQ operation timing structure in consideration of _{K f.} Referring to FIG. 17A, the HARQ UL Tx timing corresponding to the # 2 DL subframe is delayed by one frame.

(B) in FIG. 17 is a diagram illustrating a HARQ operation timing structure in consideration of the _{K c.} Referring to FIG. 17B, each of the HARQ UL Tx timings corresponding to the # 1 and # 2 DL subframes is delayed by one frame.

  FIG. 18 is a diagram illustrating a HARQ operation timing structure for an even-hop relay station according to an embodiment of the present invention. In FIG. 18, D: U = 2: 2. As can be seen from FIG. 18, the HARQ DL Tx timing corresponding to the # 0 UL subframe is delayed by one frame.

  As described above, the value of K needs to be selected according to the DL: UL ratio and Tx / Rx processing time to provide faster HARQ timing. The system operator can select the HARQ operation timing structure and the appropriate K value according to the system configuration information such as DL: UL ratio and Tx / Rx processing time, and this system configuration information is transmitted through the DL common control channel. The

HARQ timing structure for a long TTI Hereinafter, a HARQ timing structure based on allocation information for a long TTI will be described with reference to Tables 3 and 4.

In DL HARQ, when data burst allocation information indicating transmission of a data burst having a long TTI is transmitted in a specific DL subframe, the long TTI transmission is transmitted in the # 0 DL subframe of the next frame. The HARQ feedback for this long TTI transmission is transmitted in the UL subframe that is mapped to the DL subframe of the next frame (ie, the subframe carrying the data burst allocation information). In UL HARQ, when the long TTI transmission indicated by the data burst allocation information transmitted in a specific DL subframe is not usable in the same frame, the UL data burst of the long TTI transmission is # 0 of the next frame. Transmitted in the UL subframe, HARQ feedback for the UL data burst is transmitted in the DL subframe having the same index as the DL subframe of the next frame (ie, the subframe carrying the data burst allocation information). The frame index is determined using the above-described HARQ Tx offset and HARQ feedback offset. For example, if the data burst allocation information transmitted in the #l subframe (l is not 0) indicates transmission of a long TTI and DL data burst occupying the entire DL period (N _TTI = D), the burst transmission is # 0 Start with DL subframe. However, if the data burst allocation information transmitted in the DL subframe l where l is not 0 indicates a long TTI transmission, this DL data burst is not transmitted in the same frame, and this data burst allocation information is It is considered to indicate a long TTI transmission in the frame.

Referring to Table 3 for DL HARQ, the data burst allocation information transmitted in the #l DL subframe of the #i frame indicates data burst transmission in the #m DL subframe according to the NA _-MAP . However, in the case of a long TTI transmission, the start of this data burst transmission is determined according to DL subframe index m and N _TTI which is the TTI of the data burst. Therefore, long TTI transmission is started in #h DL subframe of #a frame, and HARQ feedback for long TTI transmission is transmitted in #f UL subframe of #b frame. When UL HARQ feedback is a NACK signal, retransmission of this data burst is performed in #h of the #c frame or the next DL subframe. Here, the frame indexes a, b, and c and the subframe indexes h and f are the UL subs corresponding to the indexes i, l, and m acquired from the data burst allocation information and the indexes i, l, and m, respectively. It is determined as follows according to the frame index n and _NTTI .

When D−m ≧ N _TTI , the long TTI transmission indicated by this data burst allocation information starts in the #m subframe of the #i frame, so a = i and h = m. . On the other hand, if D−m <N _TTI , the remaining DL frame period is smaller than N _TTI , so this data burst cannot be transmitted in the #i frame. Therefore, a long TTI transmission is started in the # 0 subframe of the # (i + 1) frame, and a = i + 1 and h = 0.

  The index f of the UL subframe carrying UL HARQ feedback for this data burst is determined according to the index l of the DL subframe carrying this data burst allocation information so that the UL HARQ feedback is not concentrated on a specific UL subframe. The Here, the relationship between l and f follows the relationship between m and n defined in Table 3. Therefore, since UL HARQ feedback is transmitted in the next frame, b = a + 1 (= i + 2).

For example, in the 5: 3 TDD structure, when N _TTI = 5, N _A-MAP = 1, K = 1, and Tx / Rx processing time = 3, transmission is performed in the # 2 DL subframe of the #i frame. Since the long TTI transmission indicated by the data burst allocation information (l = 2) is Dm (5-2) <N _TTI (= 5), the # (i + 1) (a = (i + 1)) frame Starting with # 0 (h = 0) DL subframe, UL HARQ feedback for this data burst is transmitted in # 1 (n = 2-1) UL subframe of # (i + 2) (b = (i + 2)) frame Is done.

  In another example, when a long TTI occupies the entire DL period in TDD DL, the data burst transmission is always started in # 0 DL subframe. In such a system, when the data burst allocation information transmitted in the #l DL subframe indicates TTI transmission with a long DL, if l = 0, the subframe indexes m, n and HARQ operation The frame index j is calculated as shown in Table 3. On the other hand, when l ≠ 0, the data burst allocation information indicates data burst transmission started in the # 0 subframe of the # (i + 1) frame that is the next frame of the #i frame. The HARQ feedback for this data burst is transmitted in the #n subframe of the #j frame. Therefore, n and j are calculated by the following formula 14 instead of Table 3. That is, the position (n, j) at which the HARQ feedback is transmitted is determined based on the subframe index l of the data burst allocation information and the frame index (j + 1) of the data burst.

Here, m = 0 and N _TTI = D. Therefore, in Equation 12, z is calculated as Equation 15 by replacing 0 and D with m and _NTTI respectively. Here, n is determined based on the index l of the DL subframe carrying this data burst allocation information.

Referring to Table 4 for UL HARQ, the data burst allocation information transmitted in the #l DL subframe of the #i frame is the #m UL subframe of the #j frame according to the NA _-MAP and the DL subframe index l. Data burst transmission starting with. In the case of a long TTI transmission, the start of this data burst transmission is determined according to the UL subframe index m and N _TTI which is the TTI of this data burst. Therefore, long TTI transmission is started in #h DL subframe of #a frame, and HARQ feedback for long TTI transmission is transmitted in #f DL subframe of #b frame. When the DL HARQ feedback is a NACK signal, retransmission of this data burst is performed in the #h UL subframe of the #c frame. Here, the frame indexes a, b, and c and the subframe indexes h and f are indexes i and l that carry the data burst allocation information, UL frames and subframe indexes j and i corresponding to the indexes i and l, and m and N _TTI are determined as follows.

When U−m ≧ N _TTI , j = i, and since the long TTI transmission indicated by this data burst allocation information starts in the #m subframe of the #j frame, a = i, h = m. On the other hand, if U−m <N _TTI , j = i + 1 and the remaining UL frame period is smaller than N _TTI , so this data burst cannot be transmitted in the #i frame. Therefore, since long TTI transmission is started in the # 0 UL subframe of the # (i + 1) frame, a = i + 1 and h = 0. Since DL HARQ feedback is transmitted in #l DL subframe, f = 1. Referring to Equation 13, DL HARQ feedback is transmitted in a #b (b = (a + 1)) frame when UhN _TTI + l ≧ Rx_Time4. If UhN _TTI + l <Rx_Time4, DL HARQ feedback is transmitted in #b (b = (a + 2)) frames. If the DL HARQ feedback is a NACK signal, retransmission starts in the #h UL subframe of the #c frame. Here, similarly to the calculation of the frame index a, when a = i, c = b, and when a = i + 1, c = b + 1.

For example, in a 5: 3 TDD structure, when N _TTI = 3, N _A-MAP = 1, and Tx / Rx processing time = 3, data burst allocation information transmitted in the # 2 DL subframe of the #i frame The UL data burst transmission indicated by
Since U−m (3-1) <N _TTI (= 3), it starts with the # 0 (h = 0) UL subframe of the # (i + 1) (a = (i + 1)) frame, and this data burst DL HARQ feedback is transmitted in the # 2 (f = 2) UL subframe of the # (i + 2) (b = (i + 2)) frame. If the DL HARQ feedback is a NACK signal, the retransmission is # (i + 3), ie, # 0 UL sub of (b + 1 = i + 3) frame, similar to the calculation of a = i + 1 based on the HARQ Tx offset being 1. Done in a frame.

  In another example, if a long TTI occupies the entire UL period in the TDD UL, the data burst transmission is always initiated in the # 0 UL subframe. In such a system, when the data burst allocation information in the #l DL subframe indicates TTI transmission with a long UL, the data burst corresponding to the subframe index l is transmitted in the # 0 subframe of the #j frame. (M = 0). The HARQ feedback for this data burst is transmitted in the #l DL subframe of the #k frame. If this HARQ feedback is a NACK signal, HARQ retransmission is started in the # 0 UL subframe of the #p frame. Here, the frame indexes j, k, and p are calculated according to the formula defined in Table 4 using the HARQ Tx offset v and the HARQ feedback offset w determined in consideration of m = 0.

  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 be started in any subframe. However, if the start of a long TTI transmission is limited to a specific subframe taking into account the realization complexity or any other factors, the control information (eg resource allocation information and HARQ feedback information, as in TDD mode) ) Can be concentrated on specific subframes. Therefore, the HARQ timing needs to be readjusted by FDD as in the TDD mode.

If a long TTI transmission is limited to start with a specific DL subframe, ie, DL subframe x for DL HARQ operation in an FDD system, the next HARQ timing may be considered. A long TTI transmission includes at least one DL subframe (x ₁ , x ₂ ,..., X _max ). Here, N _A-MAP is 1. That is, when the data burst allocation information transmitted in the #l DL subframe (l ≠ x) indicates a long TTI transmission, the long TTI transmission is a DL subframe in which a long TTI transmission is possible after the #l subframe. Be started.

  In the above case, when the data burst allocation information transmitted in the #l DL subframe indicates a TTI transmission with a long DL, and l = x, the subframe indexes m and n and the frame index j for HARQ operation Is calculated according to Table 1. On the other hand, if l ≠ x, this data burst transmission starts with the #m frame. The HARQ feedback for this data burst is transmitted in the #n subframe of the #j frame. Here, the indices m, n, and j are determined by the following Expression 16 instead of Table 1. That is, the position (n, j) of the HARQ feedback is determined based on the DL subframe index 1 of the data burst allocation information, the subframe index x of the data burst, and the frame index.

Here, x _n ⁱ indicates the #x _n subframe of the #i frame, and l = 0, 1,. . . , F-1.

For example, if the start of TTI transmission is limited to # 0 and # 4 DL subframes, F = 8, N _TTI = 4, and Tx / Rx processing time is 3 subframes, # 1 of #i frame , # 2, or # 3 The long TTI transmission indicated by the data burst allocation information provided in the DL subframe (ie, x ₂ = 4) starts in the # 4 DL subframe (m = 4) of the #i frame The HARQ feedback for this long TTI transmission is transmitted in the #n UL subframe of the # (i + 1) frame. Here, n ranges from 5 to 7. Here, since (ceil (8/2) -4 + 3) is greater than or equal to 3, z = 0. Also, the long TTI transmission indicated by the data burst allocation information provided in the # 5 to # 7 DL subframes of the #i frame starts with the # 0 DL subframe (m = 0) of the # (i + 1) frame, The HARQ feedback for this long TTI transmission is transmitted in the #n UL subframe of the # (i + 2) frame. Here, n ranges from 1 to 3. At this time, since (ceil (8/2) -4-5) is smaller than 3, z = 1.

In UL HARQ in FDD mode, the next HARQ timing may be considered if the start of a long TTI transmission is limited to UL subframe y, which is a specific UL subframe for UL HARQ operation in the FDD system. A long TTI transmission includes at least one UL subframe (y ₁ , y ₂ ,..., Y _max ).

  In the above case, when the data burst allocation information transmitted in the #l DL subframe indicates TTI transmission with a long UL, and n = y, the subframe index m and the frame index j for HARQ operation are: Calculated according to Table 2. On the other hand, if n ≠ y, this data burst transmission is started in the #m UL subframe. That is, this data burst allocation information indicates data burst transmission in the #m UL subframe of the #j frame. The HARQ feedback for this data burst is transmitted in the #l DL subframe of the #k frame. If the HARQ feedback is a NACK signal or a resource allocation for retransmission is indicated, HARQ retransmission is started in the #m subframe of the #p frame. Here, the indices m, j, k, and p are determined by the following Expression 17 instead of Table 2. That is, the position (m, j) of the HARQ feedback is determined based on the DL subframe index 1 of the data burst allocation information, the subframe index y and the frame index i of the data burst.

  Here, the frame indexes j, k, and p are calculated according to the equations defined in Table 2 using the HARQ Tx offset v and the HARQ feedback offset w determined in consideration of m = 0.

Here, y _n ⁱ indicates the #y _n subframe of the #i frame, and l = 0, 1,. . . , F-1.

For example, the start of TTI transmission is limited to # 0 and # 4 UL subframes (ie, y ₁ = 0, y ₁ = 4), F = 8, N _TTI = 4, and 3 Tx / Rx processing times Is indicated by the data burst allocation information provided in the # 1, # 2, or # 3 DL subframe of the #i frame (ie, 1 ≦ l ≦ 3, 5 ≦ n ≦ 7) Long TTI transmission starts with # 0 UL subframe of # (i + 1) frame, and HARQ feedback for long TTI transmission is transmitted with # 1, # 2 or # 3 DL subframe of # (i + 2) frame . Here, since (ceil (8/2) -1 + 0-n) is smaller than 3, v = 1. Since (floor (8/2) -4 + n-0) is greater than or equal to 3, w = 0. Also, the long TTI transmission indicated by the data burst allocation information in the # 5, # 6, or # 7 DL subframe of the #i frame (ie, 5 ≦ l ≦ 7, 1 ≦ n ≦ 3) is # (i + 1 ) Starting with frame # 4 UL subframe (m = 4), HARQ feedback for long TTI transmissions is #l (l is one of 5, 6 and 7) of # (i + 2) frame ) Transmitted in subframe. If the HARQ feedback is a NACK signal and resource allocation for retransmission is indicated, HARQ retransmission is started in the # 4 UL subframe of the # (i + 3) frame. Here, since (ceil (8/2) -1 + 4-n) is greater than or equal to 3, v = 0. Since (floor (8/2) -4 + n-4) is smaller than 3, w = 1.

In another embodiment, N _A-MAP = 1 if data burst allocation information is transmitted in all DL subframes. Therefore, Tables 1 to 4 are converted into Tables 5 to 8 below. The following table is for determining at least one transmission time among an allocation A-MAP with data burst allocation information, a HARQ subpacket carrying a data burst, a HARQ feedback (ACK or NACK), and a HARQ retransmission subpacket. Can be used. However, it should be understood that the following table should not be construed as limiting the invention.

  For example, as shown in FIG. 1, when each super frame includes four frames, N is 4 in Tables 5 to 8. In the case of 'HARQ feedback in UL' in Table 7 or 'HARQ Subpacket Tx in UL' in Table 8, when D is the same as U, n is the same regardless of the above equation. That is, n = m−k.

  According to a modified embodiment of the invention, the transmitter and the receiver have at least one table with result values corresponding to all possible input values according to the formulas in Tables 4 to 8 or Tables 9 to 12. And the result value corresponding to the current input value can be read to determine HARQ timing. As an example, this input value indicates a subframe index and a frame index of allocation A-MAP IE Tx in DL.

  According to a modified embodiment of the present invention, the following Tables 9 to 12 may be used to determine the HARQ timing using the data burst allocation information and the transmission time of the allocation A-MAP.

  As another embodiment, the above-described UL HARQ operation timing is applicable to a channel for resource allocation having a UL transmission relationship. For example, in the case of the UL fast feedback channel, the base station transmits resource allocation information for fast UL feedback in the #l subframe of the #i frame. The transmission timing of UL fast feedback information, that is, the frame index and the subframe index are determined based on i and l. More specifically, the frame index j and the subframe index m of the UL fast feedback information are determined according to any one of Table 2, Table 4, Table 6, and Table 8.

  In the TDD system, the DL subframe and the UL subframe are individually indexed in the DL and UL. However, the DL subframe and the UL subframe are sequentially included in one frame including the DL and the UL. Can be indexed. The UL subframe index x is replaced with the subframe index d + x in the frame.

  19 and 20 are diagrams illustrating signal flows for operation between a base station and a terminal according to a DL and UL HARQ timing structure according to an embodiment of the present invention.

  Referring to FIG. 19, in step 1802, the base station transmits system configuration information to a terminal. This system configuration information is broadcast by the base station or obtained by negotiation between the base station and the terminal in order to allow the system access of the terminal. This system configuration information is required to realize the HARQ timing structure, and includes bandwidth (total number of subframes), number of subframes for each link (DL and UL), Tx / Rx processing time of the base station, and It includes the Tx / Rx processing time of the terminal.

  After the terminal acquires the system information from the system configuration information, the base station and the terminal can perform data communication with each other in step 1804. In a modified embodiment, step 1804 may be omitted if the terminal recognizes this system configuration information in advance.

  In step 1806, the base station transmits allocation information including or indicating a frame index, a subframe index, a long TTI, and MAP related information in the #l DL subframe of the #i frame to the terminal. The terminal extracts necessary information by decoding the allocation information. The terminal determines the frame index and subframe index of each HARQ operation based on the frame index and subframe index of the previous HARQ operation according to at least one of the above-described embodiments of the present invention.

  In step 1808, the base station transmits a DL HARQ burst in the #h subframe of the #a frame according to the allocation information, and the terminal decodes the DL HARQ burst based on the allocation information. In step 1810, the terminal transmits HARQ feedback for the DL HARQ burst according to the decoding result in the #f subframe of the #b frame to the base station.

  In step 1812, the next allocation information may be transmitted in the #h subframe of the #c frame according to a predetermined allocation information transmission period. If the HARQ feedback is a NACK signal, at step 1814, the DL HARQ burst may be retransmitted.

  Referring to FIG. 20, in step 1902, the base station transmits system configuration information to a terminal. After the terminal obtains system information from the system configuration information and accesses the base station, the base station and the terminal can perform data communication with each other in step 1904.

  In step 1906, the base station transmits allocation information including or indicating the frame index, subframe index, long TTI, and MAP related information in the #l DL subframe of the #i frame to the terminal. The terminal extracts necessary information by decoding the allocation information. The terminal determines the frame index and subframe index of each HARQ operation based on the frame index and subframe index of the previous HARQ operation according to at least one of the above-described embodiments of the present invention.

  In step 1908, the terminal transmits a UL HARQ burst in the #h subframe of the #a frame according to the allocation information, and the base station decodes the UL HARQ burst based on the allocation information. In step 1910, the base station transmits HARQ feedback or the next allocation information for the UL HARQ burst according to the decoding result in the #f subframe of the #b frame to the terminal. If this HARQ feedback is a NACK signal, in step 1912, the UL HARQ burst may be retransmitted in the #h subframe of the #c frame according to a predetermined transmission period.

  In order to realize at least one of the above-described embodiments of the present invention, each of the base station and the terminal has a controller configured by a processor, a program code and an associated parameter for the operation of the controller. And a memory for storing and a transmitter and a receiver for exchanging signaling messages or data traffic with a partner communication station under the control of the controller. The controller controls HARQ timing for transmitter and receiver operations according to at least one of the embodiments of the invention described above.

  Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the scope and spirit of the invention. The scope of the present invention should not be limited to the above-described embodiments, but should be defined within the scope of the appended claims and their equivalents.

300 #i frame # 1 DL subframe 310 #i frame # 5 UL subframe 320 # (i + 1) frame # 1 DL subframe 330 # (i + 1) frame # 5 UL subframe

Claims (42)

A method for performing a hybrid automatic repeat request (HARQ) operation in a wireless mobile communication system that uses a frame each having a plurality of subframes for communication,
Determining HARQ timing including DL data burst transmission time for DL HARQ and HARQ feedback transmission time according to data burst allocation information transmitted in #l downlink (DL) subframe of #i frame;
Performing HARQ operations according to the determined HARQ timing;
At least one frame index and at least one subframe index indicating the HARQ timing are determined by using l and i ;
In the case of an FDD superframe, each frame has 4 subframes, each of which has 8 subframes. UL subframes used for occupying different frequency bands,
In the case of a TDD superframe, each frame includes 4 subframes, each of which has 8 subframes. A predetermined number of subframes among all subframes are used as DL subframes, and the remaining subframes are UL subframes. A method characterized by being used as a frame . The frequency response duplex (FDD) mode is used, and the HARQ timing is determined by a table having a result value according to the following formula or the following formula: The method described.


Here, l indicates an index of a subframe carrying an allocation A-MAP information element (IE) including the data burst allocation information, i indicates an index of a frame carrying the allocation A-MAP IE, m represents an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n represents an index of a subframe carrying the HARQ feedback, and j represents the HARQ feedback. Indicates the index of the frame, F indicates the number of subframes per frame, N indicates the number of frames per superframe, 4 if each superframe has 4 frames, z is , DL HARQ feedback offset. The method of claim 2, wherein the DL HARQ feedback offset z is determined according to the following equation according to a data burst processing time of the HARQ subpacket burst.


Here, ceil () represents a sealing function, NTTI represents the number of subframes occupied by the HARQ subpacket, and Rx_time represents the data burst processing time. The retransmission of the data burst corresponding to the HARQ feedback is started in a subframe having the same index m after a predetermined number of frames from the transmission of the data burst. Method. Performing the HARQ operation comprises:
A base station (BS) transmitting the HARQ subpacket starting with the #m DL subframe of the #i frame to a terminal (MS);
The method according to claim 2, comprising: the base station receiving the HARQ feedback for the HARQ subpacket from the terminal in a #n UL subframe of a #j frame. Performing the HARQ operation comprises:
A terminal receiving from the base station the HARQ subpacket starting in the #m DL subframe of the #i frame;
The method according to claim 2, further comprising: transmitting the HARQ feedback for the HARQ subpacket to the base station in a #n UL subframe of a #j frame. If the data burst is a long transmission time interval (TTI) occupying two or more subframes in frequency division duplex (FDD) mode, the HARQ timing is determined by the following equation or The method of claim 1, wherein the method is determined by a table having a result value according to:


Here, l indicates an index of a subframe in which an allocation advanced MAP information element (A-MAP IE) including the data burst allocation information is provided, and i indicates a frame in which the allocation A-MAP IE is provided. M denotes an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n denotes an index of a subframe carrying the HARQ feedback, and j denotes the HARQ. Indicates the index of the frame carrying the feedback, F indicates the number of subframes per frame, N indicates the number of frames per superframe, and is 4 if each superframe has 4 frames. Yes, z is the DL HARQ feedback offset Shows, XNI shows #xn subframe # i frame. 3. When the time division duplex (TDD) mode is used, the HARQ timing is determined by the following formula or a table having a result value according to the following formula: The method described.


Here, each frame has D subframes for downlink (DL) transmission and U subframes for uplink (UL) transmission, and l indicates the data burst allocation information. The assigned A-MAP information element (IE) includes a range of 0 to D-1 as an index of a subframe provided, i represents a frame index provided with the assigned A-MAP IE, m Denotes an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n denotes an index of a subframe carrying the HARQ feedback, and j denotes a frame carrying the HARQ feedback N represents the number of frames per superframe, and each superframe Is 4 if the frame has 4 frames, z indicates the DL HARQ feedback offset, and if D is less than or equal to U, then K is -ceil {(UD) / 2 }, If D is greater than U, K is calculated by floor {(DU) / 2}. The method of claim 8, wherein the DL HARQ feedback offset z is determined according to the following equation according to a data burst processing time of the HARQ subpacket burst.


Here, NTTI indicates the number of subframes occupied by the HARQ subpacket, and Rx_time indicates the data burst processing time. The retransmission of the data burst corresponding to the HARQ feedback is started in a subframe having a subframe index m after a predetermined number of frames from the transmission of the data burst. Method. When the subframe indexes l, m, and n are used as DL subframe indexes, each of the subframe indexes l, m, and n has a range from 0 to D−1, and D is , Indicating the number of DL subframes defined in a period excluding the period for supporting the legacy system in each frame, and when the subframe indices l, m, and n are used as UL subframe indices, Each of the subframe indices l, m, and n has a range from 0 to U-1, where U is the UL subframe defined in the period excluding the period that supports the legacy system in each frame. Indicates the number, and the frame index corresponds to the whole period including the period to support the legacy system in each frame The method according to claim 8, characterized in that is calculated using the sub-frame index order that. When the subframe indexes l, m, and n are used as DL subframe indexes, the DL subframe index is re-ordered with respect to the DL subframe used for communication from the relay station (RS) to the terminal. Index, and
When the subframe indexes l, m, and n are used as UL subframe indexes, the UL subframe index is a UL subframe used for communication from a terminal (MS) to a relay station (RS). The frame index is calculated using a subframe index order corresponding to the entire period used for communication with the relay station within each frame. The method of claim 8. Performing the HARQ operation comprises:
A base station transmitting the HARQ subpacket starting with a #m DL subframe of the #i frame to a terminal;
The method according to claim 8, further comprising: receiving the HARQ feedback for the HARQ subpacket from the terminal through a #n UL subframe of the #j frame. Performing the HARQ operation comprises:
A terminal receiving the HARQ subpacket starting from a #m DL subframe of the #i frame from a base station;
The method according to claim 8, further comprising: transmitting the HARQ feedback for the HARQ subpacket to the base station through a #n UL subframe of the #j frame. In time division duplex (TDD) mode, the allocation A-MAP IE including the data burst allocation information indicates a long transmission time interval (TTI) transmission, and when l is not 0, the HARQ subpacket corresponding to the data burst Transmission is started in # 0 DL subframe of # (i + 1) frame, and the HARQ feedback for the HARQ subpacket is transmitted in #n ′ UL subframe of #j ′ frame,
Here, the long TTI transmission means that the HARQ subpacket occupies two or more subframes, and whether the subframe index n ′ and the frame index j ′ are determined by the following equations: Or a table having a result value according to the following formula:

A method for performing a hybrid automatic repeat request (HARQ) operation in a wireless mobile communication system that uses a frame each having a plurality of subframes for communication,
In accordance with the data burst allocation information transmitted in the #l downlink (DL) subframe of the #i frame, the transmission time of the UL data burst for uplink (UL) HARQ, the transmission time of HARQ feedback, and the data burst Determining HARQ timing including a retransmission point;
Performing HARQ operations according to the determined HARQ timing;
At least one frame index and at least one subframe index indicating the HARQ timing are determined by using the l and i ;
In the case of an FDD superframe, each frame has 4 subframes, each of which has 8 subframes. UL subframes used for occupying different frequency bands,
In the case of a TDD superframe, each frame includes 4 subframes, each of which has 8 subframes. A predetermined number of subframes among all subframes are used as DL subframes, and the remaining subframes are UL subframes. A method characterized by being used as a frame . The frequency response duplex (FDD) mode is used, wherein the HARQ timing is determined by a table having a result value according to a formula in the following table or a formula in the following table. The method described.


Here, l indicates an index of a subframe carrying an allocation A-MAP information element (IE) including the data burst allocation information, i indicates an index of a frame carrying the allocation A-MAP IE, m represents an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, j represents an index of a frame carrying the HARQ feedback, and F represents the number of subframes per frame. N is the number of frames per superframe, 4 if each superframe has 4 frames, k is the index of the frame carrying the HARQ feedback, and v is Indicates the UL HARQ transmission offset, w is the UL HARQ feedback Shows the click offset. The UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to a data burst processing time of the HARQ subpacket burst according to the following equation or a table having a result value according to the following equation: 18. The method according to 17.


Here, ceil () represents a sealing function, floor () represents a floor function, NTTI represents the number of subframes occupied by the HARQ subpacket, and Rx_time represents the data burst processing time. . 18. The retransmission of the data burst corresponding to the HARQ feedback is started at a time determined by a formula having the following table or a result value according to the formula of the next table. Method.


Here, p indicates an index of a frame from which retransmission of the data burst is started when the HARQ feedback is a negative acknowledgment (NACK), v indicates the UL HARQ transmission offset, and w indicates Indicates the UL HARQ feedback offset. Performing the HARQ operation comprises:
A base station receiving the HARQ subpacket starting from a #m UL subframe of the #j frame from a terminal;
The base station transmitting the HARQ feedback for the HARQ subpacket to the terminal in a #l downlink (DL) subframe of the #k frame;
The base station comprises: receiving from the terminal a retransmission of the HARQ subpacket that starts in a #m uplink (UL) subframe of the #p frame. the method of. Performing the HARQ operation comprises:
A terminal transmitting to the base station the HARQ subpacket that starts in a #m UL subframe of the #j frame;
The terminal receives the HARQ feedback for the HARQ subpacket in the #l DL subframe of the #k frame from the base station;
The method according to claim 17, further comprising: retransmitting the HARQ subpacket starting from a #m UL subframe of the #p frame to the base station. If the data burst is a long transmission time interval (TTI) occupying two or more subframes in frequency division duplex (FDD) mode, the HARQ timing is determined by the following equation or The method of claim 16, wherein the method is determined by a table having a result value according to:


Here, l indicates an index of a subframe in which an allocation advanced MAP information element (A-MAP IE) including the data burst allocation information is provided, and i indicates a frame in which the allocation A-MAP IE is provided. M denotes an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n denotes an index of a subframe carrying the HARQ feedback, and j denotes the HARQ. Indicates the index of the frame carrying the feedback, F indicates the number of subframes per frame, N indicates the number of frames per superframe, and is 4 if each superframe has 4 frames. Yes, p is the HARQ feedback negative response If a NACK), the index of the frame re-transmission of the data burst begins, v denotes the UL HARQ feedback offset, yni shows #yn subframe # i frame. The method of claim 16, wherein when a time division duplex (TDD) mode is used, the HARQ timing is determined by a table having a result value according to a formula of the following table or a formula of the following table. The method described.


Here, each frame has D subframes for downlink (DL) transmission and U subframes for uplink (UL) transmission, and l indicates the data burst allocation information. The assigned A-MAP information element (IE) includes a range of 0 to D-1 as an index of a subframe provided, i represents a frame index provided with the assigned A-MAP IE, m Denotes an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n denotes an index of a subframe carrying the HARQ feedback, and j denotes a frame carrying the HARQ feedback N represents the number of frames per superframe, and each superframe Is 4 if the system has 4 frames, k indicates the index of the frame carrying the HARQ feedback, v indicates the UL HARQ transmission offset, w indicates the UL HARQ feedback offset, and D Is less than U, K is calculated by -ceil {(UD) / 2}, and when D is greater than or equal to U, K is floor {(DU) / 2. }. 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 of the HARQ subpacket burst using the following formula:


Here, NTTI indicates the number of subframes occupied by the HARQ subpacket, and each of Tx_Time and Rx_Time indicates the data burst processing time. The method of claim 23, wherein retransmission of the data burst corresponding to the HARQ feedback is initiated at a time determined by the following table.


Here, p indicates an index of a frame from which retransmission of the data burst is started when the HARQ feedback is a negative acknowledgment (NACK).   When the subframe indexes l, m, and n are used as DL subframe indexes, each of the subframe indexes l, m, and n has a range from 0 to D−1, and D is , Indicating the number of DL subframes defined in a period excluding the period for supporting the legacy system in each frame, and when the subframe indices l, m, and n are used as UL subframe indices, Each of the subframe indices l, m, and n has a range from 0 to U-1, where U is the UL subframe defined in the period excluding the period that supports the legacy system in each frame. Indicates the number, and the frame index corresponds to the whole period including the period to support the legacy system in each frame The method of claim 23, characterized in that is calculated using the sub-frame index order that. When the subframe indexes l, m, and n are used as DL subframe indexes, the DL subframe index is re-ordered with respect to the DL subframe used for communication from the relay station (RS) to the terminal. Index, and
When the subframe indexes l, m, and n are used as UL subframe indexes, the UL subframe index is a UL subframe used for communication from a terminal (MS) to a relay station (RS). The frame index is calculated using a subframe index order corresponding to the entire period used for communication with the relay station within each frame. 24. The method of claim 23. Performing the HARQ operation comprises:
A base station receiving the HARQ subpacket starting from a #m UL subframe of the #j frame from a terminal;
The base station transmitting the HARQ feedback for the HARQ subpacket to the terminal in a #l downlink (DL) subframe of the #k frame;
24. The base station comprising: receiving from the terminal a retransmission of the HARQ subpacket starting in a #m uplink (UL) subframe of the #p frame. the method of. Performing the HARQ operation comprises:
A terminal transmitting to the base station the HARQ subpacket that starts in a #m UL subframe of the #j frame;
The terminal receives the HARQ feedback for the HARQ subpacket in the #l DL subframe of the #k frame from the base station;
The method according to claim 23, further comprising: retransmitting the HARQ subpacket started in the #m UL subframe of the #p frame to the base station. When the allocation A-MAP IE including the data burst allocation information indicates a long transmission time interval (TTI) transmission in time division duplex (TDD) mode, the transmission of the HARQ subpacket corresponding to the data burst is #j Starting with # 0 UL subframe of the frame, the HARQ feedback for the HARQ subpacket is transmitted in the #l UL subframe of the #p frame, and the long TTI transmission is performed when the HARQ subpacket has two or more subframes The method according to claim 16, which means to occupy An apparatus for performing a hybrid automatic repeat request (HARQ) operation in a wireless mobile communication system that uses a frame having a plurality of subframes for communication,
A controller for determining HARQ timing including a DL data burst transmission time and a HARQ feedback transmission time for DL HARQ according to data burst allocation information transmitted in #l downlink (DL) subframe of #i frame; ,
A transceiver that performs HARQ operations according to the determined HARQ timing;
At least one frame index and at least one subframe index indicating the HARQ timing are determined by using l and i;
In the case of an FDD superframe, each frame includes 4 frames, each having 8 subframes, DL subframes used for transmission from the base station to the terminal, and transmissions from the terminal to the base station. UL subframes used for occupying different frequency bands,
In the case of a TDD superframe, each frame includes 4 subframes, each of which has 8 subframes. A predetermined number of subframes among all subframes are used as DL subframes, and the remaining subframes are UL subframes. Used as a frame
A device characterized by that. When the frequency division duplex (FDD) mode is used, the controller determines the HARQ timing according to a formula having the following table or a result value according to the following table.
32. The apparatus of claim 31, wherein:


Here, l indicates an index of a subframe carrying an allocation A-MAP information element (IE) including the data burst allocation information, i indicates an index of a frame carrying the allocation A-MAP IE, m represents an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n represents an index of a subframe carrying the HARQ feedback, and j represents the HARQ feedback. Indicates the index of the frame, F indicates the number of subframes per frame, N indicates the number of frames per superframe, 4 if each superframe has 4 frames, z is , DL HARQ feedback offset. The DL HARQ feedback offset z is determined according to the following equation according to the data burst processing time of the HARQ subpacket burst.
33. The apparatus of claim 32.


Here, ceil () represents a sealing function, NTTI represents the number of subframes occupied by the HARQ subpacket, and Rx_time represents the data burst processing time. When time division duplex (TDD) mode is used, the HARQ timing is determined by a table having a result value according to the formula in the following table or the formula in the following table.
32. The apparatus of claim 31, wherein:


Here, each frame has D subframes for downlink (DL) transmission and U subframes for uplink (UL) transmission, and l indicates the data burst allocation information. The assigned A-MAP information element (IE) includes a range of 0 to D-1 as an index of a subframe provided, i represents a frame index provided with the assigned A-MAP IE, m Denotes an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n denotes an index of a subframe carrying the HARQ feedback, and j denotes a frame carrying the HARQ feedback N represents the number of frames per superframe, and each superframe Is 4 if the frame has 4 frames, z indicates the DL HARQ feedback offset, and if D is less than or equal to U, then K is -ceil {(UD) / 2 }, Where D is greater than U, K is calculated by floor {(DU) / 2}. The DL HARQ feedback offset z is determined according to the following equation according to the data burst processing time of the HARQ subpacket burst.
35. The apparatus of claim 34.


Here, NTTI indicates the number of subframes occupied by the HARQ subpacket, and Rx_time indicates the data burst processing time. An apparatus for performing a hybrid automatic repeat request (HARQ) operation in a wireless mobile communication system that uses a frame having a plurality of subframes for communication,
In accordance with the data burst allocation information transmitted in the #l downlink (DL) subframe of the #i frame, the transmission time of the UL data burst for uplink (UL) HARQ, the transmission time of HARQ feedback, and the data burst A controller for determining HARQ timing including a retransmission time point;
A transceiver that performs HARQ operations according to the determined HARQ timing;
At least one frame index and at least one subframe index indicating the HARQ timing are determined by using the l and i;
In the case of an FDD superframe, each frame includes 4 frames, each having 8 subframes, DL subframes used for transmission from the base station to the terminal, and transmissions from the terminal to the base station. UL subframes used for occupying different frequency bands,
In the case of a TDD superframe, each frame includes 4 subframes, each of which has 8 subframes. A predetermined number of subframes among all subframes are used as DL subframes, and the remaining subframes are UL subframes. Used as a frame
A device characterized by that. When the frequency division duplex (FDD) mode is used, the controller determines the HARQ timing by a formula having the following table or a result value according to the following table.
37. The apparatus of claim 36.


Here, l indicates an index of a subframe carrying an allocation A-MAP information element (IE) including the data burst allocation information, i indicates an index of a frame carrying the allocation A-MAP IE, m represents an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, j represents an index of a frame carrying the HARQ feedback, and F represents the number of subframes per frame. N is the number of frames per superframe, 4 if each superframe has 4 frames, k is the index of the frame carrying the HARQ feedback, and v is Indicates the UL HARQ transmission offset, w is the UL HARQ feedback Shows the click offset. The UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to the data burst processing time of the HARQ subpacket burst according to the following formula or a table having a result value according to the following formula:
38. The apparatus of claim 37.


Here, ceil () represents a sealing function, floor () represents a floor function, NTTI represents the number of subframes occupied by the HARQ subpacket, and Rx_time represents the data burst processing time. . Retransmission of the data burst corresponding to the HARQ feedback is started at a time determined by a table having a result value according to the formula in the following table or the formula in the next table
38. The apparatus of claim 37.


Here, p indicates an index of a frame from which retransmission of the data burst is started when the HARQ feedback is a negative acknowledgment (NACK), v indicates the UL HARQ transmission offset, and w indicates Indicates the UL HARQ feedback offset. When time division duplex (TDD) mode is used, the HARQ timing is determined by a table having a result value according to the formula in the following table or the formula in the following table.
37. The apparatus of claim 36.


Here, each frame has D subframes for downlink (DL) transmission and U subframes for uplink (UL) transmission, and l indicates the data burst allocation information. The assigned A-MAP information element (IE) includes a range of 0 to D-1 as an index of a subframe provided, i represents a frame index provided with the assigned A-MAP IE, m Denotes an index of a subframe in which transmission of a HARQ subpacket corresponding to the data burst is started, n denotes an index of a subframe carrying the HARQ feedback, and j denotes a frame carrying the HARQ feedback N represents the number of frames per superframe, and each superframe Is 4 if the system has 4 frames, k indicates the index of the frame carrying the HARQ feedback, v indicates the UL HARQ transmission offset, w indicates the UL HARQ feedback offset, and D Is less than U, K is calculated by -ceil {(UD) / 2}, and when D is greater than or equal to U, K is floor {(DU) / 2. }. The UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to the data burst processing time of the HARQ subpacket burst using the following equation:
  41. The apparatus of claim 40.


Here, NTTI indicates the number of subframes occupied by the HARQ subpacket, and each of Tx_Time and Rx_Time indicates the data burst processing time. Retransmission of the data burst corresponding to the HARQ feedback is initiated at a time determined by the following table:
41. The apparatus of claim 40.


Here, p indicates an index of a frame from which retransmission of the data burst is started when the HARQ feedback is a negative acknowledgment (NACK).