KR20110047162A - Communication method - Google Patents

Abstract

PURPOSE: A communication method is provided to a uniform HARQ processing time by efficiently performing an HARQ operation performed between a base station and a terminal. CONSTITUTION: A data burst is received from a sub-frame corresponding to a downlink sub-frame index, and the largest integer number among the integer numbers equal to or smaller than the difference between the number of downlink sub-frames and the number of uplink sub-frames is determined as a parameter value. An uplink sub-frame index for transmitting a feedback is determined by using the downlink sub-frame index and the parameter value.

Description

Communication method {COMMUNICATION METHOD}

The present invention relates to a communication method. In particular, the present invention relates to a base station and a mobile station using hybrid ALQ.

The wireless mobile communication system mainly performs communication using a communication frame.

Next, a communication frame will be described with reference to FIGS. 1 and 2.

1 illustrates a communication frame of a conventional frequency division duplex (FDD).

As shown in FIG. 1, a frequency division duplex communication frame includes F downlink subframes and F uplink subframes. F corresponds to the number of subframes constituting one communication frame.

F downlink subframe indexes corresponding to F-1 are allocated to the F downlink subframes, and uplink subframe indexes corresponding to F-1 from 0 to F-1 are allocated to the F uplink subframes.

2 illustrates a communication frame of a conventional time division duplex (TDD).

As shown in FIG. 2, the time division duplex communication frame includes D downlink subframes and U uplink subframes.

D downlink subframe indexes corresponding to D-1 are allocated to D downlink subframes, and uplink subframe indexes corresponding to 0 to U-1 are allocated to U uplink subframes.

The wireless mobile communication system may change the structure of the communication frame according to the channel bandwidth and the cyclic prefix ratio (CP ratio). Table 1 below is an example.

Meanwhile, the wireless mobile communication system may use a transmission time interval (TTI) as a transmission time unit. TTI corresponds to the transmission duration of a physical layer for a packet encoded on a radio air interface, and corresponds to a subframe or an advanced air interface subframe. It is expressed as an integer number. That is, one TTI is a transmission duration of a packet (subpacket or data burst) occupying one subframe length, and n TTI represents a transmission duration of a packet by n subframe lengths.

In addition, a data burst may be transmitted over one subframe or over a plurality of consecutive subframes. If a data burst is transmitted in one subframe, the duration for that data burst is called one TTI or default TTI.If the data burst is transmitted over multiple consecutive subframes, the duration for that data burst is Long. It is called TTI. For example, in the case of Long TTI transmission in the FDD transmission mode, the data burst may be defined as occupying a length corresponding to four subframes.

The mobile communication system can use the following four types of subframes according to the number of Orthogonal Frequency Division Multiple Access (OFDMA) symbols. The type-1 subframe consists of six OFDMA symbols, the type-2 subframe consists of seven OFDMA symbols, the type-3 subframe consists of five OFDMA symbols, and the type-4 subframe contains nine It consists of the number of OFDMA symbols.

For example, a mobile communication system using a FDD mode with a channel bandwidth of 7 MHz, a CP ratio of 1/8, a F = 5, and a TDD mode with D + U = 5 will be described below. First, since the same CP ratio is applied to the FDD mode and the TDD mode, the OFDMA symbol time (Ts) is the same in both modes. The mobile communication system uses a communication frame composed of one type-1 subframe and four type-2 subframes for FDD, and two type-1 subframes and three type-2 subframes for TDD. Use the configured communication frame. Accordingly, the communication frame of the FDD consists of a total of 34 OFDMA symbols, and the communication frame of the TDD consists of a total of 33 OFDMA symbols. As described above, the TDD communication frame has one OFDMA symbol less than the FDD communication frame. However, in the TDD mode, TTG (Transmit / Receive Transition Gap) and RTG (Receive / Transmit Transition Gap) are used. The time to process data bursts and control signals in mode is about the same.

On the other hand, in the mobile communication system, a hybrid AQ that combines a forward error correction (FEC) method and an automatic repeat request (ARQ) method in order to secure high-speed data packet transmission, low delay, and communication reliability. Hybrid ARQ, HARQ) is used a lot.

The HARQ protocol is classified into a synchronous HARQ technique and an asynchronous HARQ technique according to transmission timing of a retransmitted packet. A synchronous HARQ technique is a method in which a transmission time of a retransmission packet is constant for an initial transmission packet. In the asynchronous HARQ scheme, a scheduler of a base station determines a transmission time of a retransmission packet for an initial transmission packet.

In addition, the HARQ scheme is classified into an adaptive HARQ scheme and a non-adaptive HARQ scheme according to a change in the amount and location of allocated resources. The adaptive HARQ scheme is an amount and location of allocated resources. The non-adaptive HARQ scheme is to fix the amount and location of allocated resources.

High scheduling gains and high data rates can be achieved by properly mixing synchronous and asynchronous HARQ and adaptive and non-adaptive HARQ techniques and using less signaling overhead. For example, the mobile communication system may apply adaptive asynchronous HARQ for downlink data transmission and synchronous HARQ for uplink data transmission.

As described above, since the time for processing the data burst and the control signal in the FDD mode and the TDD mode is almost similar, the same HARQ timing needs to be applied in the FDD mode and the TDD mode.

The technical problem to be achieved by the present invention is to provide a communication method, a base station and a mobile station to apply the same HARQ timing.

According to another aspect of the present invention, a method in which a mobile station communicates with a base station using a frame including one or more downlink subframes and one or more uplink subframes, includes a method of data burst in a subframe corresponding to a downlink subframe index. Starting reception; When the frame follows a time division duplex scheme and the number of the downlink subframes is larger than the number of the uplink subframes, the frame is less than or equal to half the difference between the number of the downlink subframes and the number of the uplink subframes. Determining the largest integer among the integers as the parameter value; Determining an uplink subframe index for feedback transmission using at least the downlink subframe index and the parameter value when the frame follows a time division duplex scheme; And transmitting feedback for the data burst to the base station in a subframe corresponding to the uplink subframe index.

The method may include the difference between the number of uplink subframes and the number of downlink subframes when the frame follows a time division duplex scheme and the number of the downlink subframes is less than or equal to the number of the uplink subframes. The method may further include determining an integer obtained by multiplying -1 by the smallest integer greater than or equal to half as the parameter value.

The determining of the uplink subframe index when the frame follows the time division duplex method may include: the number of the downlink subframes is greater than the number of the uplink subframes and the downlink subframe index is greater than the parameter value. Determining the uplink subframe index by subtracting the parameter value from the downlink subframe index when the downlink subframe index is greater than or equal to and smaller than the sum of the parameter value and the number of the uplink frames; If the number of the downlink subframes is greater than the number of the uplink subframes and the downlink subframe index is greater than or equal to 0 and the downlink subframe index is less than the parameter value, 0 is assigned to the uplink subframe. Steps to Determine by Index And the number of the downlink subframes is greater than the number of the uplink subframes, and the downlink subframe index is greater than or equal to the sum of the parameter value and the number of the uplink frames, and the downlink subframe index is the same. Determining a value obtained by subtracting 1 from the number of uplink frames as the uplink subframe index when the number of downlink frames is smaller than the number of downlink frames, and the number of the downlink subframes is smaller than the number of the uplink subframes. In the same case, the method may include determining a value obtained by subtracting the parameter value from the downlink subframe index as the uplink subframe index.

When the frame follows the frequency division duplex scheme, the smallest integer equal to or greater than or equal to the sum of half the number of subframes in the frame and the downlink subframe index is divided by the number of subframes in the frame. The method may further include determining an uplink subframe index for feedback transmission.

According to another aspect of the present invention, a method in which a base station communicates with a mobile station using a frame including one or more downlink subframes and one or more uplink subframes includes transmission of data bursts in a subframe corresponding to a downlink subframe index. Starting; And receiving feedback from the mobile station for the data burst in a subframe corresponding to an uplink subframe index.

When the frame follows a time division duplex scheme, the uplink subframe index may be determined using at least the downlink subframe index and a parameter value.

If the frame follows a time division duplex scheme and the number of the downlink subframes is larger than the number of the uplink subframes, the parameter value is half the difference between the number of the downlink subframes and the number of the uplink subframes. It may correspond to the largest integer less than or equal to.

If the frame follows a time division duplex scheme and the number of the downlink subframes is less than or equal to the number of the uplink subframes, the parameter value is a difference between the number of the uplink subframes and the number of the downlink subframes. The smallest integer greater than or equal to half of may correspond to an integer multiplied by -1.

When the frame follows the frequency division duplex scheme, the uplink subframe index is a subframe within the frame that is the smallest integer equal to or greater than half of the number of subframes in the frame and the sum of the downlink subframe indexes. It may correspond to the remaining value divided by the number of.

According to another aspect of the present invention, a method for a mobile station communicating with a base station using a frame including one or more downlink subframes and one or more uplink subframes includes resource allocation information in a subframe corresponding to a downlink subframe index. Receiving; If the frame follows a time division duplex scheme and the number of the downlink subframes is greater than or equal to the number of the uplink subframes, it is less than half the difference between the number of the downlink subframes and the number of the uplink subframes. Determining the largest integer among integers equal to or equal to the parameter value; Determining an uplink subframe index using at least the downlink subframe index and the parameter value when the frame follows the time division duplex method; And starting transmission of a data burst corresponding to the resource allocation information in a subframe corresponding to the uplink subframe index.

In the method, when the frame follows a time division duplex scheme and the number of the downlink subframes is smaller than the number of the uplink subframes, the method is less than half the difference between the number of the uplink subframes and the number of the downlink subframes. The method may further include determining, as the parameter value, an integer by multiplying -1 by the smallest integer greater than or equal to.

The determining of the uplink subframe index when the frame follows the time division duplex method may include: the number of the downlink subframes is greater than or equal to the number of the uplink subframes and the downlink subframe index is the parameter. When the subframe index is greater than or equal to a value and the downlink subframe index is smaller than the sum of the parameter value and the number of the uplink frames, a value obtained by subtracting the parameter value from the downlink subframe index is determined as the uplink subframe index. And if the number of the downlink subframes is greater than or equal to the number of the uplink subframes and the downlink subframe index is greater than or equal to 0 and the downlink subframe index is less than the parameter value, As an uplink subframe index Determining, the number of the downlink subframes is greater than or equal to the number of the uplink subframes, and the downlink subframe index is greater than or equal to the sum of the parameter value and the number of the uplink frames; If a subframe index is smaller than the number of the downlink frames, determining the uplink subframe index by subtracting 1 from the number of the uplink frames, and wherein the number of the downlink subframes is the uplink subframe. Is smaller than the number of subframe indexes and the downlink subframe index is greater than 0 and less than an integer obtained by subtracting 1 from the number of the downlink subframes, and subtracts the parameter value from the downlink subframe index to the uplink subframe index. Determining may include.

The method includes receiving feedback for the data burst in a subframe corresponding to the downlink subframe index; And if the feedback is negative, starting the retransmission of the data burst in a subframe corresponding to the uplink subframe index.

According to another aspect of the present invention, a method for communicating with a mobile station by using a frame including one or more downlink subframes and one or more uplink subframes includes resource allocation information in a subframe corresponding to a downlink subframe index. Transmitting to the mobile station; And starting reception of a data burst corresponding to the resource allocation information in a subframe corresponding to an uplink subframe index.

When the frame follows a time division duplex scheme, the uplink subframe index may be determined using at least the downlink subframe index and a parameter value.

If the frame follows a time division duplex scheme and the number of the downlink subframes is greater than or equal to the number of the uplink subframes, the parameter value is a difference between the number of the downlink subframes and the number of the uplink subframes. It may correspond to the largest integer less than or equal to half of.

If the frame follows a time division duplex scheme and the number of the downlink subframes is smaller than the number of the uplink subframes, the parameter value is half the difference between the number of the uplink subframes and the number of the downlink subframes. The smallest integer greater than or equal to may be the integer multiplied by -1.

When the frame follows the frequency division duplex scheme, the uplink subframe index is a subframe within the frame that is the smallest integer equal to or greater than half of the number of subframes in the frame and the sum of the downlink subframe indexes. It may correspond to the remaining value divided by the number of.

According to another aspect of the present invention, a method in which a mobile station communicates with a base station using a frame including one or more downlink subframes and one or more uplink subframes includes a data burst in a subframe corresponding to a downlink subframe index. Receiving; Transmitting feedback for the data burst to the base station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And transmitting feedback for the data burst to the base station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows the frequency division duplex scheme.

When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the The second reference timing interval may be the same.

According to another aspect of the present invention, a method in which a base station communicates with a mobile station using a frame including one or more downlink subframes and one or more uplink subframes transmits a data burst in a subframe corresponding to a downlink subframe index. Making; Receiving feedback for the data burst from the mobile station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And receiving feedback for the data burst from the mobile station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows a frequency division duplex scheme.

When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the The second reference timing interval may be the same.

According to another aspect of the present invention, a method for a mobile station communicating with a base station using a frame including one or more downlink subframes and one or more uplink subframes includes resource allocation information in a subframe corresponding to a downlink subframe index. Receiving from the base station; Transmitting a data burst corresponding to the resource allocation information to the base station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And transmitting the data burst to the base station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows the frequency division duplex scheme.

When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the The second reference timing interval may be the same.

The method includes receiving feedback from the base station for the data burst in a subframe corresponding to the downlink subframe index; And if the feedback is negative, transmitting the data burst to the base station in a subframe having an uplink subframe index equal to an uplink subframe index of an uplink subframe spaced apart from the downlink subframe index by a first reference timing interval. The method may further include retransmitting.

According to another aspect of the present invention, a method for communicating with a mobile station by using a frame including one or more downlink subframes and one or more uplink subframes includes resource allocation information in a subframe corresponding to a downlink subframe index. Transmitting to the mobile station; Receiving a data burst corresponding to the resource allocation information from the mobile station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And receiving the data burst from the mobile station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows a frequency division duplex scheme.

When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the The second reference timing interval may be the same.

The method may further include transmitting feedback for the data burst to a mobile station in a subframe corresponding to the downlink subframe index.

According to another aspect of the present invention, a method for a mobile station communicating with a base station using a time division duplex frame including D downlink subframes and U uplink subframes includes a subpacket in an mth downlink subframe. Starting to receive a message; And transmitting feedback for the subpacket to the base station in an nth uplink subframe.

ceil (x) is a function that returns the smallest integer that is greater than or equal to the parameter x, and floor (x) is a function that returns the largest integer that is less than or equal to the parameter x.

According to another aspect of the present invention, a base station communicates with a mobile station using a time division duplex frame including D downlink subframes and U uplink subframes. Starting transmission; And receiving feedback from the mobile station for the subpacket in an nth uplink subframe.

The index n can be obtained by the following equation.

According to another aspect of the present invention, a mobile station communicates with a base station using a time division duplex frame including D downlink subframes and U uplink subframes. Receiving information; And starting transmission of a subpacket corresponding to the resource allocation information in an mth uplink subframe.

According to another aspect of the present invention, a base station communicates with a mobile station using a time division duplex frame including D downlink subframes and U uplink subframes. Transmitting to the mobile station; And starting reception of a subpacket corresponding to the resource allocation information in an mth uplink subframe.

The index m can be obtained by the following equation.

According to a feature of the invention, the mobile communication system can obtain the same HARQ signal processing time in the TDD mode and the FDD mode, through which the HARQ operation performed between the base station and the terminal can be efficiently performed, the base station and the terminal is consistent It may have a HARQ processing time.

1 illustrates a conventional frequency division duplex communication frame.
2 illustrates a conventional time division duplex communication frame.
3 is a flowchart illustrating a downlink data communication method according to an embodiment of the present invention.
4 shows downlink HARQ timing according to an embodiment of the present invention.
5 shows downlink HARQ timing according to another embodiment of the present invention.
6 is a flowchart illustrating an uplink data communication method according to an embodiment of the present invention.
7 shows uplink HARQ timing according to an embodiment of the present invention.
8 shows uplink HARQ timing according to another embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In this specification, a mobile station (MS) includes a terminal, a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), and a user equipment. It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

In the present specification, a base station (BS) is an access point (AP), a radio access station (Radio Access Station, RAS), a Node B (Node B), a base transceiver station (Base Transceiver Station, BTS), MMR ( Mobile Multihop Relay) -BS and the like, and may include all or part of functions such as an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

Next, a downlink data communication method according to an embodiment of the present invention will be described with reference to FIGS. 3 to 5.

3 is a flowchart illustrating a downlink data communication method according to an embodiment of the present invention.

First, the base station 100 transmits downlink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index l (S110). The downlink resource allocation information may be a control signal such as A-MAP (Advanced MAP).

Next, the base station 100 starts transmission of a downlink data burst such as a subpacket in a subframe corresponding to the downlink subframe index m through the allocated downlink resource according to the downlink resource allocation information (S130).

The mobile station 200 decodes the received downlink data burst, and if successful, transmits an ACK feedback corresponding to a positive response to the base station 100, and fails to decode a NACK feedback corresponding to a negative response. (S150). The mobile station 200 uses a subframe corresponding to the uplink subframe index n for feedback transmission.

According to an embodiment of the present invention, the mobile station 200 may determine the uplink subframe index n according to Equation 1 or Equation 2. Equation 1 is applied when the communication frame follows the frequency division duplex scheme, and Equation 2 is applied when the communication frame follows the time division duplex scheme.

In Equation 1, mod represents a modulo operator for obtaining the remaining values. That is, the expression a = (x) mod (y) means that the remainder of x divided by y is equal to a.

In Equation 2, the parameter value K is a parameter determined according to system capability such as channel bandwidth and number of subframes in the time division duplex method. The parameter K is used to obtain a HARQ reference timing interval. The downlink HARQ reference timing interval means an interval between a downlink subframe in which a downlink data burst is transmitted and a downlink subframe in which HARQ feedback is transmitted.

According to an embodiment of the present invention, the mobile station 200 may determine the parameter value K in Equation 2 according to Equation 3.

In Equation 3, the ceil (x) function returns the smallest integer greater than or equal to the parameter x. The floor (x) function returns the largest integer less than or equal to the parameter x.

When calculating the parameter value K according to Equation 3, the downlink HARQ reference timing interval is shown in Table 2.

According to Table 2, when the communication frames of the FDD mode and the TDD mode have the same number of subframes, the downlink HARQ reference timing intervals of the FDD mode and the TDD mode are different from each other. For example, in the FDD mode in which F = 5, the downlink HARQ reference timing interval is 2, while in the TDD mode in which D: U = 3: 2, the downlink HARQ reference timing interval is 1.

Next, a downlink HARQ timing when a parameter value K is calculated according to Equation 3 will be described with reference to FIG. 4.

4 shows downlink HARQ timing according to an embodiment of the present invention.

4 (a) shows downlink HARQ timing in FDD mode with F = 7, and FIG. 4 (b) shows downlink HARQ timing in TDD mode with D: U = 4: 3. According to Equation 3, the parameter value K = ceil ((D-U) / 2) = 1.

According to (a) of FIG. 4, when the base station 100 transmits downlink resource allocation information and downlink data bursts to the mobile station 200 in a subframe corresponding to the downlink subframe index (m) 1, n = Since ceil (m + F / 2) mod F = ceil (1 + 7/2) mod 7 = 5, the mobile station 200 corresponds to m = 1 in a subframe corresponding to uplink subframe index (n) 5. HARQ feedback for the data burst is transmitted to the base station 100. In addition, when the base station 100 transmits the downlink resource allocation information and the downlink data burst to the mobile station 200 in a subframe corresponding to the downlink subframe index (m) 2, the mobile station 200 transmits the uplink subframe. The HARQ feedback for the data burst corresponding to m = 2 is transmitted to the base station 100 in the subframe corresponding to the frame index n 6.

Meanwhile, according to FIG. 4B, when the base station 100 transmits downlink resource allocation information and downlink data bursts to the mobile station 200 in a subframe corresponding to the downlink subframe index (m) 1. Since K≤m <U + K, n becomes 0 by n = m-K = 1-1 = 0. That is, the mobile station 200 transmits HARQ feedback to the base station 100 for the data burst corresponding to m = 1 in the subframe corresponding to the uplink subframe index n. In addition, when the base station 100 transmits the downlink resource allocation information and the downlink data burst to the mobile station 200 in a subframe corresponding to the downlink subframe index (m) 2, the mobile station 200 transmits the uplink subframe. The HARQ feedback for the data burst corresponding to m = 2 is transmitted to the base station 100 in the subframe corresponding to the frame index n.

According to FIG. 4, the downlink HARQ reference timing interval in the FDD mode is 3 and the downlink HARQ reference timing interval in the TDD mode is 2. As such, when the parameter value K is determined according to Equation 3, even if the communication frames of the FDD mode and the TDD mode have the same number of subframes, the TDD mode has a time equivalent to one subframe compared to the FDD mode. Insufficient HARQ signal processing time can be obtained.

Accordingly, according to another embodiment of the present invention, the mobile station 200 may determine the parameter value K in Equation 2 according to Equation 4 or Equation 5.

Equation 4 is equivalent to Equation 5 since K = 0 when D = U.

When calculating the parameter value K according to Equation 4 or Equation 5, the downlink HARQ reference timing interval is shown in Table 3.

According to Table 3, when the communication frames of the FDD mode and the TDD mode have the same number of subframes, the downlink HARQ reference timing intervals of the FDD mode and the TDD mode are the same.

Next, a downlink HARQ timing when a parameter value K is calculated according to Equation 4 or 5 will be described with reference to FIG. 5.

5 shows downlink HARQ timing according to another embodiment of the present invention.

FIG. 5A shows downlink HARQ timing in FDD mode with F = 7, and FIG. 5B shows downlink HARQ timing in TDD mode with D: U = 4: 3. According to Equation 4 or Equation 5, the parameter value K = floor ((D-U) / 2) = 0.

According to FIG. 5A, when the base station 100 transmits downlink resource allocation information and a downlink data burst to the mobile station 200 in a subframe corresponding to the downlink subframe index m, n = Since ceil (m + F / 2) mod F = ceil (1 + 7/2) mod 7 = 5, the mobile station 200 corresponds to m = 1 in a subframe corresponding to uplink subframe index (n) 5. HARQ feedback for the data burst is transmitted to the base station 100. In addition, when the base station 100 transmits the downlink resource allocation information and the downlink data burst to the mobile station 200 in a subframe corresponding to the downlink subframe index (m) 2, the mobile station 200 transmits the uplink subframe. The HARQ feedback for the data burst corresponding to m = 2 is transmitted to the base station 100 in the subframe corresponding to the frame index n 6.

Meanwhile, according to FIG. 5B, when the base station 100 transmits downlink resource allocation information and downlink data bursts to the mobile station 200 in a subframe corresponding to the downlink subframe index (m) 1. Since K≤m <U + K, n becomes 1 by n = m−K = 1−0 = 1. That is, the mobile station 200 transmits HARQ feedback for the data burst corresponding to m = 1 to the base station 100 in the subframe corresponding to the uplink subframe index n = 1. In addition, when the base station 100 transmits the downlink resource allocation information and the downlink data burst to the mobile station 200 in a subframe corresponding to the downlink subframe index (m) 2, the mobile station 200 transmits the uplink subframe. The HARQ feedback for the data burst corresponding to m = 2 is transmitted to the base station 100 in the subframe corresponding to the frame index n = 2.

According to FIG. 5, the downlink HARQ reference timing interval in the FDD mode and the downlink HARQ reference timing interval in the TDD mode are both three. As such, when the communication frames of the FDD mode and the TDD mode have the same number of subframes and the parameter value K is determined according to Equation 4 or Equation 5, the TDD mode and the FDD mode obtain the same HARQ signal processing time. Through this, the HARQ operation performed between the base station and the terminal can be efficiently performed, and the base station and the terminal can have a consistent HARQ processing time.

Next, an uplink data communication method according to an embodiment of the present invention will be described with reference to FIGS. 6 to 8.

6 is a flowchart illustrating an uplink data communication method according to an embodiment of the present invention.

First, the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index l (S210). The uplink resource allocation information may be a control signal such as A-MAP (Advanced MAP).

Next, the mobile station 200 starts transmission of an uplink data burst such as a subpacket in a subframe corresponding to the uplink subframe index m through the allocated uplink resource according to the uplink resource allocation information (S230). ).

The base station 100 decodes the received uplink data burst, and if successful, transmits an ACK feedback corresponding to a positive response to the mobile station 200. If the decoding fails, the base station 100 transmits a NACK feedback corresponding to a negative response. (S250). The base station 100 uses a subframe corresponding to the downlink subframe index n for feedback transmission. The downlink subframe index n may be set to be the same as the downlink subframe index l.

According to an embodiment of the present invention, the base station 100 may determine the uplink subframe index m according to Equation 6 or Equation 7. Equation 6 is applied when the communication frame follows the frequency division duplex scheme, and Equation 7 is applied when the communication frame follows the time division duplex scheme.

In Equation 7, the parameter value K is a parameter determined according to system capability such as channel bandwidth and number of subframes in the time division duplex method. The parameter K is used to obtain the HARQ reference timing interval. The uplink HARQ reference timing interval means an interval between a downlink subframe in which uplink resource allocation information is transmitted and an uplink subframe in which an uplink data burst is transmitted.

In equation (7), m = {x ₁ , x ₂ , ..., x _n } means that m is one of x ₁ to x _n .

According to an embodiment of the present invention, the mobile station 200 may determine the parameter value K in equation (7) according to equation (3). When calculating the parameter value K according to Equation 3, the uplink HARQ reference timing interval is the same as the downlink HARQ reference timing interval and is shown in Table 2.

According to Table 2, when the communication frames of the FDD mode and the TDD mode have the same number of subframes, the uplink HARQ reference timing intervals of the FDD mode and the TDD mode are different from each other. For example, in the FDD mode in which F = 5, the uplink HARQ reference timing interval is 2, whereas in the TDD mode in which D: U = 3: 2, the uplink HARQ reference timing interval is 1.

Next, an uplink HARQ timing when a parameter value K is calculated according to Equation 3 will be described with reference to FIG. 7.

7 shows uplink HARQ timing according to an embodiment of the present invention.

FIG. 7A shows uplink HARQ timing in FDD mode with F = 7, and FIG. 7B shows uplink HARQ timing in TDD mode with D: U = 4: 3. According to Equation 3, the parameter value K = ceil ((D-U) / 2) = 1.

According to (a) of FIG. 7, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index l, m = ceil (l + F). / 2) mod F = ceil (1 + 7/2) mod 7 = 5 Accordingly, the mobile station 200 transmits an uplink data burst in a subframe corresponding to the uplink subframe index (m) 5 through the uplink resource allocated by the uplink resource allocation information corresponding to l = 1. To transmit. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 5 to the mobile station 200 in a subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index m.

In addition, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index (l) 2, the mobile station 200 corresponds to an uplink corresponding to l = 2. The uplink data burst is transmitted to the base station 100 in a subframe corresponding to the uplink subframe index (m) 6 through the uplink resource allocated by the resource allocation information. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 6 to the mobile station 200 in the subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index (m) 6.

According to (b) of FIG. 7, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index (l) 1, K ≦ l <U + K M = l-K = 1-1 = 0. Accordingly, the mobile station 200 transmits the uplink data burst in the subframe corresponding to the uplink subframe index m by the uplink resource allocated by the uplink resource allocation information corresponding to l = 1. To transmit. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 0 to the mobile station 200 in the subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index m.

In addition, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index (l) 2, the mobile station 200 corresponds to an uplink corresponding to l = 2. The uplink data burst is transmitted to the base station 100 in the subframe corresponding to the uplink subframe index (m) 1 through the uplink resource allocated by the resource allocation information. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 1 to the mobile station 200 in a subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index (m) 1.

According to FIG. 7, the uplink HARQ reference timing interval in the FDD mode is 3 and the uplink HARQ reference timing interval in the TDD mode is 2. As such, when the parameter value K is determined according to Equation 3, even if the communication frames of the FDD mode and the TDD mode have the same number of subframes, the TDD mode has a time equivalent to one subframe compared to the FDD mode. Insufficient HARQ signal processing time can be obtained.

Accordingly, according to another embodiment of the present invention, the mobile station 200 may determine the parameter value K in Equation 7 according to Equation 4 or Equation 5.

When calculating the parameter value K according to Equation 4 or Equation 5, the uplink HARQ reference timing interval is the same as the downlink HARQ reference timing interval and is shown in Table 3 described above.

According to Table 3, when the communication frames of the FDD mode and the TDD mode have the same number of subframes, the uplink HARQ reference timing intervals of the FDD mode and the TDD mode are the same.

Next, an uplink HARQ timing when a parameter value K is calculated according to Equation 4 or 5 will be described with reference to FIG. 8.

8 shows uplink HARQ timing according to another embodiment of the present invention.

FIG. 8 (a) shows uplink HARQ timing in FDD mode with F = 7, and FIG. 8 (b) shows uplink HARQ timing in TDD mode with D: U = 4: 3. According to Equation 4 or 5, the parameter value K = floor ((D-U) / 2) = 0.

According to (a) of FIG. 8, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index l, m = ceil (l + F). / 2) mod F = ceil (1 + 7/2) mod 7 = 5 Accordingly, the mobile station 200 transmits an uplink data burst in a subframe corresponding to the uplink subframe index (m) 5 through the uplink resource allocated by the uplink resource allocation information corresponding to l = 1. To transmit. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 5 to the mobile station 200 in a subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index m.

In addition, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index (l) 2, the mobile station 200 corresponds to an uplink corresponding to l = 2. The uplink data burst is transmitted to the base station 100 in a subframe corresponding to the uplink subframe index (m) 6 through the uplink resource allocated by the resource allocation information. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 6 to the mobile station 200 in the subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index (m) 6.

According to (b) of FIG. 8, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index (l) 1, K ≦ l <U + K M = l-K = 1-0 = 1. Accordingly, the mobile station 200 transmits an uplink data burst in a subframe corresponding to the uplink subframe index m by using uplink resources allocated by uplink resource allocation information corresponding to l = 1. To transmit. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 1 to the mobile station 200 in the subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index (m) 1.

In addition, when the base station 100 transmits uplink resource allocation information to the mobile station 200 in a subframe corresponding to the downlink subframe index (l) 2, the mobile station 200 corresponds to an uplink corresponding to l = 2. The uplink data burst is transmitted to the base station 100 in a subframe corresponding to the uplink subframe index (m) 2 through the uplink resource allocated by the resource allocation information. Thereafter, the base station 100 transmits HARQ feedback for the uplink data burst corresponding to m = 2 to the mobile station 200 in a subframe corresponding to the downlink subframe index n. If the HARQ feedback is NACK, the mobile station 200 retransmits the uplink data burst to the base station 100 in a subframe corresponding to the uplink subframe index m.

According to FIG. 8, the uplink HARQ reference timing interval in the FDD mode and the uplink HARQ reference timing interval in the TDD mode are both three. As such, when the communication frames of the FDD mode and the TDD mode have the same number of subframes and calculate the parameter value K according to Equation 4 or Equation 5, the TDD mode and the FDD mode obtain the same HARQ signal processing time. Through this, the HARQ operation performed between the base station and the terminal can be efficiently performed, and the base station and the terminal can have a consistent HARQ processing time.

The embodiments of the present invention described above are not only implemented by the apparatus and method but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Base station 100, mobile station 200

Claims (24)

A method for a mobile station to communicate with a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Starting reception of a data burst in a subframe corresponding to a downlink subframe index;
When the frame follows a time division duplex scheme and the number of the downlink subframes is larger than the number of the uplink subframes, the frame is less than or equal to half the difference between the number of the downlink subframes and the number of the uplink subframes. Determining the largest integer among the integers as the parameter value;
Determining an uplink subframe index for feedback transmission using at least the downlink subframe index and the parameter value when the frame follows a time division duplex scheme; And
And transmitting feedback for the data burst to the base station in a subframe corresponding to the uplink subframe index. The method of claim 1,
If the frame follows a time division duplex scheme and the number of the downlink subframes is less than or equal to the number of the uplink subframes, the frame is larger than half the difference between the number of the uplink subframes and the number of the downlink subframes. Or determining an integer value obtained by multiplying the smallest integer equal to -1 by the parameter value as the parameter value. The method of claim 2,
Determining the uplink subframe index when the frame follows the time division duplex method
The number of the downlink subframes is greater than the number of the uplink subframes, the downlink subframe index is greater than or equal to the parameter value, and the downlink subframe index is the sum of the parameter value and the number of the uplink frames. Determining a value obtained by subtracting the parameter value from the downlink subframe index as the uplink subframe index, if smaller than;
If the number of the downlink subframes is greater than the number of the uplink subframes and the downlink subframe index is greater than or equal to 0 and the downlink subframe index is less than the parameter value, 0 is assigned to the uplink subframe index. Determining with
The number of downlink subframes is greater than the number of uplink subframes, and the downlink subframe index is greater than or equal to the sum of the parameter value and the number of uplink frames, and the downlink subframe index is the downlink. Determining the uplink subframe index by subtracting 1 from the number of uplink frames when the number of frames is smaller than the number of frames;
If the number of the downlink subframes is less than or equal to the number of the uplink subframes, determining the uplink subframe index as a value obtained by subtracting the parameter value from the downlink subframe index. 4. The method according to any one of claims 1 to 3,
When the frame follows the frequency division duplex method, the remaining value obtained by dividing the smallest integer by the number of subframes in the frame by the smallest integer greater than or equal to the sum of half the number of subframes in the frame and the downlink subframe index Determining an uplink subframe index for feedback transmission. A method of communicating with a mobile station by a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Starting transmission of a data burst in a subframe corresponding to the downlink subframe index; And
Receiving feedback from the mobile station for the data burst in a subframe corresponding to an uplink subframe index;
When the frame follows a time division duplex scheme, the uplink subframe index is determined using at least the downlink subframe index and a parameter value.
If the frame follows a time division duplex scheme and the number of the downlink subframes is larger than the number of the uplink subframes, the parameter value is half the difference between the number of the downlink subframes and the number of the uplink subframes. Communication method that corresponds to the largest integer less than or equal to. The method of claim 5,
If the frame follows a time division duplex scheme and the number of the downlink subframes is less than or equal to the number of the uplink subframes, the parameter value is a difference between the number of the uplink subframes and the number of the downlink subframes. A communication method that corresponds to an integer multiplied by -1 to the smallest integer greater than or equal to half of. The method according to claim 5 or 6,
When the frame follows the frequency division duplex scheme, the uplink subframe index is a subframe within the frame that is the smallest integer equal to or greater than half of the number of subframes in the frame and the sum of the downlink subframe indexes. The communication method corresponding to the remaining value divided by the number of. A method for a mobile station to communicate with a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Receiving resource allocation information in a subframe corresponding to the downlink subframe index;
If the frame follows a time division duplex scheme and the number of the downlink subframes is greater than or equal to the number of the uplink subframes, it is less than half the difference between the number of the downlink subframes and the number of the uplink subframes. Determining the largest integer among integers equal to or equal to the parameter value;
Determining an uplink subframe index using at least the downlink subframe index and the parameter value when the frame follows the time division duplex method; And
Starting transmission of a data burst corresponding to the resource allocation information in a subframe corresponding to the uplink subframe index. The method of claim 8,
When the frame follows a time division duplex scheme and the number of the downlink subframes is smaller than the number of the uplink subframes, the frame is greater than or equal to half the difference between the number of the uplink subframes and the number of the downlink subframes. And determining the integer value of the smallest integer multiplied by -1 as the parameter value. 10. The method of claim 9,
Determining the uplink subframe index when the frame follows the time division duplex method
The number of downlink subframes is greater than or equal to the number of uplink subframes, the downlink subframe index is greater than or equal to the parameter value, and the downlink subframe index is the number of the parameter value and the uplink frame. Determining a value obtained by subtracting the parameter value from the downlink subframe index as the uplink subframe index when the sum is less than a sum;
If the number of the downlink subframes is greater than or equal to the number of the uplink subframes and the downlink subframe index is greater than or equal to 0 and the downlink subframe index is less than the parameter value, 0 is assigned to the uplink subframe. Determining the frame index;
The number of the downlink subframes is greater than or equal to the number of the uplink subframes, and the downlink subframe index is greater than or equal to the sum of the parameter value and the number of the uplink frames, and the downlink subframe index is the same. Determining a value obtained by subtracting 1 from the number of uplink frames as the uplink subframe index when the number of downlink frames is smaller than the number of downlink frames;
If the number of the downlink subframes is smaller than the number of the uplink subframes and the downlink subframe index is greater than 0 and less than an integer minus one from the number of the downlink subframes in the downlink subframe index And determining a value obtained by subtracting a parameter value as the uplink subframe index. The method according to any one of claims 8 to 10,
Receiving feedback for the data burst in a subframe corresponding to the downlink subframe index; And
If the feedback is negative, starting the retransmission of the data burst in a subframe corresponding to the uplink subframe index. A method of communicating with a mobile station by a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Transmitting resource allocation information to the mobile station in a subframe corresponding to a downlink subframe index; And
Starting reception of a data burst corresponding to the resource allocation information in a subframe corresponding to an uplink subframe index;
When the frame follows a time division duplex scheme, the uplink subframe index is determined using at least the downlink subframe index and a parameter value.
If the frame follows a time division duplex scheme and the number of the downlink subframes is greater than or equal to the number of the uplink subframes, the parameter value is a difference between the number of the downlink subframes and the number of the uplink subframes. The communication method corresponding to the largest integer less than or equal to half of. The method of claim 12,
If the frame follows a time division duplex scheme and the number of the downlink subframes is smaller than the number of the uplink subframes, the parameter value is half the difference between the number of the uplink subframes and the number of the downlink subframes. A communication method that corresponds to an integer that multiplies the smallest integer greater than or equal to -1 by -1. The method according to claim 12 or 13,
When the frame follows the frequency division duplex scheme, the uplink subframe index is a subframe within the frame that is the smallest integer equal to or greater than half of the number of subframes in the frame and the sum of the downlink subframe indexes. The communication method corresponding to the remaining value divided by the number of. A method for a mobile station to communicate with a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Receiving a data burst in a subframe corresponding to a downlink subframe index;
Transmitting feedback for the data burst to the base station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And
Transmitting feedback for the data burst to the base station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows a frequency division duplex scheme;
When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the A communication method having the same second reference timing interval. A method of communicating with a mobile station by a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Transmitting a data burst in a subframe corresponding to a downlink subframe index;
Receiving feedback for the data burst from the mobile station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And
Receiving feedback for the data burst from the mobile station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows a frequency division duplex scheme;
When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the A communication method having the same second reference timing interval. A method for a mobile station to communicate with a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Receiving resource allocation information from the base station in a subframe corresponding to a downlink subframe index;
Transmitting a data burst corresponding to the resource allocation information to the base station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And
Transmitting the data burst to the base station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows a frequency division duplex scheme;
When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the A communication method having the same second reference timing interval. The method of claim 17,
Receiving feedback from the base station for the data burst in a subframe corresponding to the downlink subframe index; And
If the feedback is negative, the data burst is retransmitted to the base station in a subframe having the same uplink subframe index as the uplink subframe index of the uplink subframe away from the downlink subframe index by a first reference timing interval. The communication method further comprises the step. A method of communicating with a mobile station by a base station using a frame including at least one downlink subframe and at least one uplink subframe,
Transmitting resource allocation information to the mobile station in a subframe corresponding to a downlink subframe index;
Receiving a data burst corresponding to the resource allocation information from the mobile station in an uplink subframe away from the downlink subframe index by a first reference timing interval when the frame follows a time division duplex scheme; And
Receiving the data burst from the mobile station in an uplink subframe away from the downlink subframe index by a second reference timing interval when the frame follows a frequency division duplex scheme;
When the total number of subframes included in the frame according to the frequency division duplex scheme is equal to the sum of the number of downlink subframes and the number of uplink subframes according to the time division duplex scheme, the first reference timing interval and the A communication method having the same second reference timing interval. The method of claim 19,
And transmitting feedback for the data burst to a mobile station in a subframe corresponding to the downlink subframe index. A method for a mobile station to communicate with a base station using a time division duplex frame including D downlink subframes and U uplink subframes,
starting reception of a subpacket in an mth downlink subframe; And
transmitting feedback for the subpacket to the base station in an nth uplink subframe,
The index n is obtained by the following equation,

ceil (x) is a function that returns the smallest integer that is greater than or equal to the parameter x, and floor (x) is a function that returns the largest integer that is less than or equal to the parameter x. A method of communicating with a mobile station by a base station using a time division duplex frame including D downlink subframes and U uplink subframes,
starting transmission of a subpacket in an mth downlink subframe; And
receiving feedback from the mobile station for the subpacket in an nth uplink subframe,
The index n is obtained by the following equation,

ceil (x) is a function that returns the smallest integer that is greater than or equal to the parameter x, and floor (x) is a function that returns the largest integer that is less than or equal to the parameter x. A method for a mobile station to communicate with a base station using a time division duplex frame including D downlink subframes and U uplink subframes,
receiving resource allocation information in the first downlink subframe; And
starting transmission of a subpacket corresponding to the resource allocation information in an mth uplink subframe,
The index m is obtained by the following equation,

ceil (x) is a function that returns the smallest integer that is greater than or equal to the parameter x, and floor (x) is a function that returns the largest integer that is less than or equal to the parameter x. A method of communicating with a mobile station by a base station using a time division duplex frame including D downlink subframes and U uplink subframes,
transmitting resource allocation information to the mobile station in a first downlink subframe; And
starting reception of a subpacket corresponding to the resource allocation information in an mth uplink subframe,
The index m is obtained by the following equation,

ceil (x) is a function that returns the smallest integer that is greater than or equal to the parameter x, and floor (x) is a function that returns the largest integer that is less than or equal to the parameter x.

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