KR101646511B1 - The method of transmitting signal using bandwidth request channel at a mobile station and mobile station using the same method - Google Patents

Abstract

A base station apparatus for performing a bandwidth request procedure and a bandwidth request procedure in a base station is disclosed. In response to the bandwidth request of the MS, the BS can transmit a bandwidth request ACK A-MAP IE to the MS to confirm that the MS has received the bandwidth request. The BS may transmit UL grant to the MS using the bandwidth request ACK A-MAP IE or the CDMA allocation A-MAP IE. The UE receiving the uplink grant from the base station can perform uplink scheduling transmission. However, if the base station fails to decode the quick access message portion received from the terminal, or if the quick access message portion is composed of null tones, the base station does not transmit the uplink grant to the terminal, To the terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting a signal using a bandwidth request channel of a mobile station and a terminal apparatus using the method,

The present invention relates to a method for performing a bandwidth request procedure of a terminal and a base station, and a terminal apparatus and a base station apparatus using the method.

A receiver can detect a preamble transmitted by a specific transmitter using a preamble sequence. Thus, the receiver can use the preamble sequence for channel estimation purposes, and can be used not only for channel estimation but also for acquiring synchronization. The length of the preamble sequence to be used in the preamble needs to be designed so that it can support well within a large cell radius in a wireless communication system. However, the length of the preamble sequence can be limited by limited resource and resource allocation. These points need to be considered in designing the bandwidth request channel.

A base station needs to detect and efficiently detect a preamble sequence of various lengths. However, no method has been studied so far that a base station can efficiently detect a bandwidth request preamble in order to perform a bandwidth request procedure. Also, there has not been studied a method of constructing a bandwidth request channel by a terminal in order to efficiently perform a bandwidth request procedure.

SUMMARY OF THE INVENTION The present invention provides a method for a terminal to transmit a signal using a bandwidth request channel.

According to another aspect of the present invention, there is provided a terminal apparatus for transmitting a signal using a bandwidth request channel.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for performing a bandwidth request procedure in a base station.

Another aspect of the present invention is to provide a base station apparatus that performs a bandwidth request procedure.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method for transmitting a signal using a bandwidth request channel, the method including transmitting a bandwidth request preamble and a bandwidth request message for bandwidth request to a base station together with the bandwidth request channel ; And receiving a message indicating that a bandwidth request has been received in response to a bandwidth request from the base station, wherein the bandwidth request channel includes M subcarriers on the frequency axis and N OFDM symbols on the time axis, In the tile, the area where the bandwidth request message is located may be composed of a null tone.

According to another aspect of the present invention, a terminal apparatus for transmitting a signal through a bandwidth request channel according to the present invention transmits a bandwidth request preamble for bandwidth request using a bandwidth request channel and a bandwidth request message to a base station ; And means for receiving a message indicating that a bandwidth request has been received in response to a bandwidth request from the base station, wherein the bandwidth request channel includes M subcarriers on the frequency axis and N OFDM symbols on the time axis, In the tile, the area where the bandwidth request message is located may be composed of a null tone.

According to another aspect of the present invention, there is provided a method for performing a bandwidth requesting procedure of a base station, comprising: receiving a bandwidth request preamble and a bandwidth request message for bandwidth request from a terminal through a bandwidth request channel; And transmitting, to the MS, a message indicating that a bandwidth request has been received in response to the reception of the bandwidth request, wherein the bandwidth request channel includes M subcarriers on the frequency axis and N OFDM symbols on the time axis, In the xN tile, the area where the bandwidth request message is located may be composed of a null tone.

According to another aspect of the present invention, there is provided a base station apparatus for performing a bandwidth request procedure, the apparatus comprising: means for receiving a bandwidth request preamble for requesting bandwidth from a terminal and a bandwidth request message through a bandwidth request channel; And means for transmitting, to the MS, a message indicating that a bandwidth request has been received in response to the bandwidth request reception, wherein the bandwidth request channel includes M subcarriers on the frequency axis and N OFDM symbols on the time axis, In the xN tile, the area where the bandwidth request message is located may be composed of a null tone.

According to another aspect of the present invention, there is provided a method for performing a bandwidth request procedure in a base station, the method comprising: receiving a bandwidth request from a terminal through a bandwidth request channel; Measuring an interference level for the bandwidth request channel and comparing the interference level with a preset threshold value; And determining whether a quick access message included in the bandwidth request channel is used according to the comparison result.

In this case, if it is determined in the determining step that the quick access message is being used, the step of transmitting information for granting uplink transmission may further comprise transmitting the information to the terminal.

Alternatively, if it is determined that the quick access message is not used or fails to decode the quick access message in the determining step, transmitting the grant information for the bandwidth request header to the terminal have.

According to another aspect of the present invention, there is provided a base station apparatus for performing a bandwidth request procedure, the apparatus comprising: means for receiving a bandwidth request from a terminal through a bandwidth request channel; Means for measuring an interference level for the bandwidth request channel and comparing the interference level with a preset threshold; And means for determining whether a quick access message included in the bandwidth request channel is used according to the comparison result.

According to the method of transmitting a signal using the bandwidth request channel according to the present invention, the terminal transmits only a bandwidth request preamble (indicator) or a bandwidth request preamble and a bandwidth request message to the bandwidth request channel, It is possible to improve the detection performance of the bandwidth request preamble by enhancing the power level that can be allocated to the bandwidth request preamble by inserting a null tone in the region.

According to the method for performing bandwidth request in the base station according to the present invention, the base station can detect a null tone and determine whether a quick access message is used, thereby efficiently performing a bandwidth request procedure.

Also, according to the present invention, a base station can measure a noise and an interference level using a null tone, thereby improving the detection performance of a bandwidth request preamble.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 shows a physical resource unit in a bandwidth request channel,
2 is a diagram illustrating an example of a bandwidth request channel structure,
FIG. 3 is a diagram illustrating an example of a 6 × 6 tile-based LRU, which is a bandwidth request tile structure according to the present invention.
FIG. 4 illustrates a 4 × 6 tile-based LRU, which is a bandwidth request tile structure according to the present invention.
FIG. 5 illustrates another example of a 6 × 6 tile-based LRU, which is a bandwidth request tile structure according to the present invention.
6 is a diagram illustrating an example of a procedure for requesting a bandwidth between a terminal and a base station;
7 is a diagram illustrating another example of a procedure for requesting a bandwidth between a terminal and a base station;
8 is a diagram illustrating a configuration of a preferred embodiment of a terminal apparatus for transmitting a signal through a bandwidth request channel according to various embodiments of the present invention,
9 is a block diagram illustrating a configuration of a preferred embodiment of a base station apparatus for performing a bandwidth request procedure according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, the following detailed description is based on the assumption that the mobile communication system is an IEEE 802.16 system. However, the present invention is applicable to any other mobile communication system, except for the peculiar aspects of the IEEE 802.16 system.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

In the following description, it is assumed that the UE collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment), an MS (Mobile Station), and an AMS (Advanced Mobile Station). In addition, it is assumed that the base station collectively refers to any node at a network end that communicates with a terminal such as a Node B, an eNode B, a base station (BS), and an access point (AP).

In a mobile communication system, a mobile station can receive information from a base station through a downlink, and the mobile station can also transmit information through an uplink. The information transmitted or received by the terminal includes data and various control information, and various physical channels exist depending on the type of information transmitted or received by the terminal.

The preamble length category can be divided into a type having a short preamble length and a preamble type having a long preamble length. Alternatively, the preamble length category can be divided into three or more categories according to the length of the preamble.

The receiver can blindly detect the transmitted preamble. The receiver then attempts to detect a preamble having as many different preamble lengths as possible. Preamble categories according to the length of the preamble can be broadcast through a broadcast message (e.g., a superframe header). After receiving a broadcast message including the preamble length category, the receiver can transmit a preamble using a preamble sequence having a preamble length indicated by the received broadcast message when a connection to the wireless communication system is required.

If the preamble length category is not broadcast, the transmitter may transmit the preamble using one of the possible preamble lengths when it needs to connect to the wireless communication system. The receiver tries to detect a preamble sequence having as many different preamble lengths as possible. The preamble length category can be applied to various downlink and / or uplink control channels (synchronization channel, ranging channel, bandwidth request channel, etc.) using a preamble.

Hereinafter, the control channel, in particular, the bandwidth request channel will be briefly described. The UE uses a contention based random access scheme or a non-contention based random access scheme to transmit Bandwidth Request information on the control channel. This bandwidth request is used to provide information about the uplink bandwidth required by the base station. The physical structure of the bandwidth request channel, which is an example of such a control channel, is as follows.

1 is a diagram showing an example of a physical resource unit in a bandwidth request channel.

Referring to FIG. 1, one physical resource unit (PRU) may have an 18x6 configuration consisting of 18 adjacent subcarriers on the frequency axis and 6 OFDM symbols on the time axis. At this time, one bandwidth request channel may be composed of one physical resource unit. Also, one bandwidth request channel may be formed by expanding a plurality of PRUs. In a logical resource unit, one PRU may be represented by one Logical Distributed Resource Unit (LDRU).

Each bandwidth request channel may include three distributed bandwidth request tiles for frequency diversity gain. One bandwidth request tile may have a 6x6 configuration of six adjacent subcarriers on the frequency axis and six OFDM symbols on the time axis.

2 is a diagram illustrating an example of a bandwidth request channel structure.

Referring to FIG. 2, in the M zone, a bandwidth request channel includes three 6 × 6 tiles (bandwidth request tiles), and each 6 × 6 tile includes a structure for transmitting a preamble and a message As shown in FIG. Here, the M zone refers to an area including one or more subframes (one subframe may include six OFDM symbols) in which the base station in the IEEE 802.16m system can communicate with the 16m terminal. Each bandwidth request tile may include a bandwidth request message with a preamble for bandwidth request. Data may be assigned to the bandwidth request message.

The location of the bandwidth request preamble and data may vary within a bandwidth request tile, and the structure shown in Figures 2 (a) and 2 (b) is only one example. As shown in FIG. 2, the number of tones for the preamble, the number of tones for data may vary. For example, one 6 × 6 tile may have 12 preamble tones and 24 data tones, or 18 preamble tones and 18 data tones, or 24 preamble tones and 12 data tones, or 30 preambles Tone and six data tones.

The 6x6 tile structure shown in FIG. 2 (a) includes 24 preamble tones and 12 data tones. In this case, 12 data tones (i.e., data having a code / sequence length of 12) may be located in 3rd and 4th subcarriers and 6 OFDM symbols within a 6x6 tile structure. The 6x6 tile structure is preferably applied when the cell size is small. In this manner, the UE can transmit a bandwidth request preamble and a bandwidth request message together in one 6 × 6 tile to the base station.

In addition, the 6x6 tile structure shown in FIG. 2 (b) can be configured with only a preamble tone. That is, the UE can allocate only a bandwidth request preamble in one 6 × 6 tile and transmit it to the base station. In the case of a large cell radius, it is preferable to transmit the bandwidth request preamble at a higher power level. Therefore, it is desirable to apply such a long preamble sequence length. As shown in FIG. 2, the number of preamble tones And the number of data tones are variable depending on the situation. In addition, the preamble length category may include a type having a short preamble length, a type having a long preamble length, or a type corresponding to three or more preamble lengths. Therefore, the base station needs to inform the terminal about the information on the length of the preamble.

Table 1 below is a table showing an example of a format in which a base station transmits bandwidth request information to a mobile station.

Referring to Table 1, a base station can determine a bandwidth request preamble length to be used by a mobile station in accordance with a situation and inform the mobile station when a mobile station requests a bandwidth through a bandwidth request channel. That is, the BS can inform the MS about the length of the bandwidth request preamble using the bandwidth preamble information field. The bandwidth preamble information field may comprise one bit, where a bit value of 0 may indicate a short preamble sequence (e.g., a preamble sequence length of 24), and a bit value of 1 may indicate a long preamble sequence (e.g., The sequence length is 36). Accordingly, the UE can receive the bandwidth preamble information field from the base station and determine the length of the bandwidth request preamble sequence.

As described above, the terminal can transmit bandwidth request information used for checking a bandwidth request through a bandwidth request channel to a base station in the form of a bandwidth request preamble or in the form of a bandwidth request preamble and a bandwidth request message. In this manner, the terminal can transmit a bandwidth request message (Bandwidth Request Preamble) and a bandwidth request message used as a content for the bandwidth request to the base station. The bandwidth request preamble is also referred to as a bandwidth request indicator. The bandwidth request message transmitted from the terminal to the base station may include information such as a buffer size, a power level, and a CRC (Cyclic Redundancy Check) bit. That is, the MS may transmit a bandwidth request preamble to the BS for requesting bandwidth, and may optionally transmit a quick access message to the BS.

The bandwidth request tile may include a preamble tone portion and a data tone portion. For example, the UE can transmit the preamble tone preamble to the Node B using four OFDM symbol resources on the frequency axis and six OFDM symbol resources on the time axis. And the data tone portion of the bandwidth request tile can be transmitted to the base station using the resources of two subcarriers on the frequency axis and six OFDM symbols on the time axis. Also, in order to support the legacy mode, the bandwidth request tile may be configured as a 4x6 tile structure consisting of four adjacent subcarriers on the frequency axis and six OFDM symbols on the time axis. Here, the legacy system is a system that has been used conventionally and is not necessarily limited to the IEEE 802.16e system. This 4 x 6 bandwidth request tile can only transmit a preamble.

Hereinafter, characteristics of the bandwidth request preamble included in the bandwidth request tile transmitted by the terminal for the bandwidth request will be described. The bandwidth request preamble can be used to distinguish a user or a service. Also, the bandwidth request preamble is used for the terminal to confirm the bandwidth request to the base station. The bandwidth request preamble may be based on Code Division Multiplexing (CDM) and the bandwidth request information may be protected by a code / sequence. At this time, the sequence can be used as long as the user can distinguish the sequence. For example, an orthogonal code, a Zadoff-Chu (ZC) sequence, and a CAZAC (Constant Amplitude Zero Autocorrelation) code can be used as a code / sequence.

Here, the length of the bandwidth request preamble is an important factor in the control channel resource allocation. In general, when the length of the bandwidth request preamble is long, it is possible to support even when the cell radius is large. However, since there is a case that a bandwidth request message is additionally sent in addition to the bandwidth request preamble (i.e., the length of the bandwidth request preamble bandwidth request message Trade-off relationship) The bandwidth request preamble length needs to be adjusted.

The bandwidth request message may be multiplexed by CDM, Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), Space Division Multiplexing (SDM) And may be multiplexed with a mixture of two or more of FDM, TDM, and SDM. The size of the bandwidth request message information can be represented by the bandwidth request message length carried in the message (data), and the bandwidth request message length is also an important factor in the control channel resource allocation.

There may be some criteria that are required when designing the physical structure of the bandwidth request channel to send a bandwidth request message with a bandwidth request preamble. These criteria include: 1) a design that allows a base station to erroneously recognize and warn that a signal is coming from a terminal and to lower a false alarm probability even though the terminal has not sent a signal; and 2) There is a need for a design that can reduce misdetection probability that does not detect this signal. And 3) preferably, have sufficient multiplexing capacity for the bandwidth request preamble and the bandwidth request message. And 4) sufficient channel estimation performance to demodulate the bandwidth request message. And 5) it is preferable that the length of the bandwidth request preamble can be adjusted in consideration of a conflict between the bandwidth request preamble and the bandwidth request message length. In order to design a bandwidth request channel like this, it is necessary to refer to these criteria.

Hereinafter, a physical structure for transmitting a bandwidth request message together with a bandwidth request preamble will be briefly described.

In the IEEE 802.16m system, there are two types of logical resource units (LRUs) that can be used as bandwidth request channels. There are 6 × 6 tile-based LRUs and 4 × 6 tile-based LRUs. That is, one bandwidth request tile has a 6 × 6 configuration including six adjacent subcarriers on the frequency axis and six OFDM symbols on the time axis, or a 4 × 6 composed of four adjacent subcarriers on the frequency axis and six OFDM symbols on the time axis. 6 configuration.

These two kinds of bandwidth request tiles differ in the number of subcarriers in the frequency axis in one bandwidth request tile unit. Therefore, it is necessary to consider both of the two aspects of securing the maximum commonality in designing these two types of bandwidth request channels and ensuring the bandwidth request channel performance.

The performance of a bandwidth request channel depends on the capability of detecting a preamble (or an indicator). In order to detect such a preamble, a correlation value of a preamble is generally compared with a predetermined threshold value and detected. In such a detection method, it is very important to set a threshold value. The base station can set a threshold value in advance and compare the threshold value and the measured interference level from the bandwidth request channel to know whether or not the bandwidth request message is used. The threshold may be a power level of noise and interference (NI), a Carrier to Interference plus Noise Ratio (CINR), a Signal to Interference plus Noise Ratio (SINR) And the like.

Therefore, in order to increase the performance of the bandwidth request channel, it is desirable to configure the bandwidth request channel structure such that the power level, the CINR level, or the SINR level of the noise and interference NI can be measured.

As a method for improving the performance of the bandwidth request channel, null tones can be inserted into the bandwidth request tile so as to measure the noise and interference (NI) level and the like in the bandwidth request channel. If the null tones are inserted into the bandwidth request tile (e.g., 6x6 tiles), the detection performance of the preamble can be stably increased. That is, if a null tone is inserted in place of data on two subcarriers and six OFDM symbols allocated to a bandwidth request message, the UE allocates the power allocated for transmitting the data part as a power for transmitting a bandwidth request preamble The base station can more efficiently detect the bandwidth request preamble from the terminal.

For example, if the UE allocates the transmission power of a preamble carried on four subcarriers to two thirds of the total power within one bandwidth request tile, the transmission power of the data carried on the remaining two subcarriers is set to 1 / 3. ≪ / RTI > However, the total power can be allocated to the transmission power of the preamble carried on the four subcarriers by making the bandwidth request message area in which the data is carried in the terminal null tone. Therefore, the base station can efficiently and stably detect the bandwidth request preamble.

For this purpose, the terminal may selectively transmit a quick access message to the base station in addition to the bandwidth request preamble in order to request a bandwidth. At this time, resources for the quick access message may not be used and the unused quick access message resource Can be configured in null tone form.

FIG. 3 is a diagram illustrating an example of a 6 × 6 tile-based LRU, which is a bandwidth request tile structure according to the present invention.

Referring to FIG. 3, a 6x6 tile-based LRU includes a tone for a preamble, a tone for data and a null tone. Tone for data is a tone for a quick access message or a bandwidth request message. As shown in FIG. 3, the 6x6 tile-based LRU can be configured in nine types. However, these nine forms are merely illustrative.

As shown in FIGS. 3 (a) to 3 (i), a plurality of (M) 6 × 6 tiles may be gathered to form one bandwidth request channel. In FIGS. 3 (a) to 3 (i), the horizontal axis and the vertical axis represent frequency and time, respectively, or the horizontal axis and the vertical axis represent time and frequency, respectively. Hereinafter, it is assumed that the horizontal axis represents the time axis (i.e., the OFDM symbol) and the vertical axis represents the frequency axis (i.e., the subcarrier) in FIGS. 3A to 3I.

As shown in FIGS. 3 (a) to 3 (i), the positions of the preamble, data, and null tone are arranged differently in each 6 × 6 tile structure. As described above, the bandwidth request tile may be composed of a 6 × 6 tile structure different from the 6 × 6 tile structure shown in FIGS. 3 (a) through 3 (i).

Referring to FIG. 3A, the bandwidth request tile includes only a preamble tone and a data tone. The preamble tone and the data tone may be allocated on three adjacent subcarriers and six OFDM symbols, respectively. The code / sequence length of the preamble tone and data tone is equal to 18.

Referring to FIG. 3 (b), the bandwidth request tile includes a preamble tone, a data tone, and a null tone. The preamble tone may be allocated on three adjacent subcarriers and six OFDM symbols (i.e., the preamble tone length is 18), the data tones may be allocated on two adjacent subcarriers and six OFDM symbols The tone length is 12), and the null tone can be allocated on one subcarrier and six OFDM symbols (i.e., the null tone length is 6).

Referring to FIG. 3 (c), the bandwidth request tile includes a preamble tone, a data tone, and a null tone. The preamble tone may be allocated on three adjacent subcarriers and six OFDM symbols (i.e., the preamble tone length is 18), the data tones may be allocated on one adjacent subcarrier and six OFDM symbols The tone length is 6), and the null tone can be allocated on two subcarriers and six OFDM symbols (i.e., the null tone length is 12).

Also, as shown in FIG. 3 (d), the preamble tone length may be 18 and the null tone length may be 18, and the preamble tone length may be 24 and the dayton tone length may be 12, as shown in FIG. 3 (e) As shown in FIG. 3 (f), the preamble tone length may be 24, the data tone length may be 6, and the null tone length may be 6. As shown in FIG. 3 (g), the preamble tone length may be 24, the null tone length may be 12, and the preamble tone length may be 30 and the data tone length may be 6, as shown in FIG. 3 (h). Also, as shown in FIG. 3 (i), the preamble tone length may be 30 and the null tone length may be 6.

FIG. 4 is a diagram illustrating a 4 × 6 tile-based LRU that is a bandwidth request tile structure according to the present invention.

Referring to FIG. 4, a 4x6 tile-based LRU includes a tone for a preamble, a tone for data and a null tone. As in FIG. 3, the tone for the data here is a tone for a quick access message or a bandwidth request message. The 4x6 tile-based LRU may be configured in six types as shown in FIG. However, these six forms are merely illustrative. In FIGS. 4A to 4F, the horizontal axis and the vertical axis respectively indicate frequency and time, or the horizontal axis and vertical axis respectively indicate time and frequency. Hereinafter, it is assumed that the horizontal axis represents the time axis (i.e., the OFDM symbol) and the vertical axis represents the frequency axis (i.e., the subcarrier) in FIGS. 4A to 4F.

Referring to FIG. 4A, the bandwidth request tile may be composed of only the preamble tone. That is, a preamble tone can be allocated on four adjacent subcarriers and six OFDM symbols (preamble tone length is 24). As shown in FIG. 4B, the bandwidth request tile may have a preamble tone length of 18 and a null tone length of 6, and the preamble tone length is 18 and the data tone length is 6 As shown in FIG. 4 (d), the preamble tone length may be 12 and the null tone length may be 12. 4 (e), the preamble tone length may be 12, the data tone length may be 6, and the null tone length may be 6. As shown in FIG. 4 (f), the preamble tone length may be 12, Lt; / RTI >

The 6 × 6 bandwidth request tile structure shown in FIGS. 3A to 3I and the 4 × 6 bandwidth request tile structure shown in FIGS. 4A to 4F are combined to form a new tile structure Lt; / RTI > For example, the structure of FIG. 3 (a) and the structure of FIG. 4 (a) may be combined, and the structure of FIG. 3 (a) and the structure of FIG. 4 (b) may be combined.

FIG. 5 is a diagram illustrating another example of a 6 × 6 tile-based LRU, which is a bandwidth request tile structure according to the present invention.

The structures shown in Figs. 5 (a) to 5 (d) are modifications of the tile structure shown in Fig. 3 (b). 3 (b), the positions of the preamble tones, the data tones, and the null tones may be arranged differently from those illustrated in Figs. 5 (a) to 5 (d). 3 (a), etc.), the preamble tone length, the data tone length, and the null tone length are the same, but they can be placed at different positions have.

Hereinafter, a procedure for requesting a bandwidth using the bandwidth request tile structure will be briefly described.

6 is a diagram illustrating an example of a procedure for requesting bandwidth between a terminal and a base station.

Referring to FIG. 6, a terminal may transmit a bandwidth request preamble sequence and a quick access message to a base station in order to request a bandwidth to a base station (S610). The base station receiving the preamble sequence and the quick access message from the UE may transmit a bandwidth request ACK A-MAP IE to the UE in step S620 to confirm that the base station has received the response in response to the bandwidth request of the UE. However, if the base station fails to decode the quick access message portion received from the terminal, or if the quick access message portion is composed of null tones, the base station transmits a request for a standalone bandwidth request header The grant may be transmitted to the terminal (S630). In step S640, the MS transmits an independent bandwidth request header to the BS in step S650. The BS transmits a grant for uplink transmission to the MS in step S650. Upon receiving the grant for the uplink transmission, the UE can start uplink scheduling transmission to the base station (S660).

7 is a diagram illustrating another example of a procedure for requesting bandwidth between a terminal and a base station.

Referring to FIG. 7, in step S710, the MS transmits a bandwidth request preamble sequence and a quick access message to request bandwidth from the BS. In response to the bandwidth request of the MS, the BS can transmit a bandwidth request ACK A-MAP IE to the MS (S720). In step S730, the BS transmits an UL grant to the MS using the bandwidth request ACK A-MAP IE or the CDMA allocation A-MAP IE. The MS receiving the UL grant from the BS can perform the UL scheduling transmission (S740).

However, if the base station fails to decode the quick access message portion received from the terminal, or if the quick access message portion is composed of null tones, etc., the base station does not transmit the uplink grant to the terminal, And transmits an approval of the bandwidth request header to the terminal as in step S630, and then returns to step S640 to step S660 as shown in FIG. 6 to perform a fallback procedure.

Hereinafter, a terminal apparatus and a base station apparatus for performing the bandwidth request procedure according to the present invention will be briefly described.

8 is a diagram illustrating a configuration of a preferred embodiment of a terminal apparatus for transmitting a signal using a bandwidth request channel.

8, the terminal apparatus may include a transmitting unit 810, a receiving unit 820, a memory 830, and a processor 840.

The transmitting unit 810 may transmit a bandwidth request preamble and a bandwidth request message for bandwidth request to the base station together with the bandwidth request channel. At this time, in a 6x6 tile composed of six subcarriers of the frequency axis included in the bandwidth request channel and six OFDM symbols of the time axis, the terminal apparatus allocates the area in which the bandwidth request message is located as a null tone, Signal can be transmitted.

Receiving means 820 may receive a message indicating that it has received a bandwidth request in response to a bandwidth request.

The memory 830 can store information received from outside, data, data processed by the terminal, and the like for a predetermined time, and can be replaced with a component such as a buffer (not shown).

9 is a diagram illustrating a configuration of a preferred embodiment of a base station apparatus that performs a bandwidth request procedure according to the present invention.

9, the base station apparatus may include a receiving means 910, an interference level measuring and comparing means 920, a means 930 for determining whether to use a quick access message, and a transmitting means 940.

The receiving means 910 can receive a bandwidth request from the terminal through a bandwidth request channel. That is, the receiving unit 910 can receive a bandwidth request preamble and a bandwidth request message for bandwidth request from the terminal through the bandwidth request channel. In a 6x6 tile composed of six subcarriers of a frequency axis included in the bandwidth request channel and six OFDM symbols of a time axis, a specific region in which the bandwidth request message is located may be assigned a null tone.

The interference level measurement and comparison means 920 may measure the interference level for the bandwidth request channel and compare the interference level with a predetermined threshold value. According to the comparison result, the means 930 for determining whether to use the quick access message can determine whether or not a quick access message included in the bandwidth request channel is used.

If the determining means 930 determines that the quick access message is used, the transmitting means 940 can transmit information granting uplink transmission to the terminal. The receiving means 910 may receive the UL scheduling transmission from the UE. In addition, the transmitting means 940 may transmit a message to the terminal indicating that the bandwidth request has been received in response to the reception of the bandwidth request information from the terminal. The transmission means 940 can transmit signals, data and information of each kind to the terminal.

Alternatively, if it is determined that the quick access message is not used or decoded in failure of the quick access message, the transmission means 940 transmits grant information for the bandwidth request header To the terminal. Then, the base station apparatus can perform steps S640 to S660 described in Fig.

The memory 950 can store information received from the outside, data, data processed by the base station apparatus for a predetermined time, and replaced with a component such as a buffer (not shown).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the invention disclosed herein has been presented to enable any person skilled in the art to make and use the present invention. While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. For example, those skilled in the art can utilize each of the configurations described in the above-described embodiments in a manner of mutually combining them.

Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (14)

A method for a terminal to transmit a signal on a bandwidth request channel in a wireless communication system,
Transmitting bandwidth request information including a bandwidth request preamble to the base station through the bandwidth request channel; And
Receiving a message from the base station indicating that the bandwidth request preamble has been received in response to the bandwidth request information,
Wherein the bandwidth request channel comprises a plurality of bandwidth request tiles, each of the bandwidth request tiles including a preamble tone part and a data tone part,
The preamble tone portion includes four subcarriers and six OFDM symbols (orthogonal frequency division multiplexing symbols) for transmission of the bandwidth request preamble,
The data tone portion includes two consecutive subcarriers and six OFDM symbols for transmission of data including a quick access message,
Wherein the two consecutive subcarriers of the data tone portion and the six OFDM symbols in the case where the plurality of bandwidth request tiles include null tones are used for transmission of the null tones instead of transmission of the data. . A terminal for transmitting a signal through a bandwidth request channel in a wireless communication system,
A transmitter for transmitting bandwidth request information including a bandwidth request preamble to the base station via the bandwidth request channel; And
And a receiver for receiving from the base station a message indicating that the bandwidth request preamble has been received in response to the bandwidth request information,
Wherein the bandwidth request channel comprises a plurality of bandwidth request tiles, each of the bandwidth request tiles including a preamble tone part and a data tone part,
The preamble tone portion includes four subcarriers and six OFDM symbols (orthogonal frequency division multiplexing symbols) for transmission of the bandwidth request preamble,
The data tone portion includes two consecutive subcarriers and six OFDM symbols for transmission of data including a quick access message,
Wherein the two consecutive subcarriers of the data tone portion and the six OFDM symbols in the case where the plurality of bandwidth request tiles include null tones are used for transmission of the null tones instead of transmission of the data. Used terminal. A method for a base station in a wireless communication system to receive a signal via a bandwidth request channel,
Receiving bandwidth request information including a bandwidth request preamble from the terminal through the bandwidth request channel; And
And transmitting to the terminal a message indicating that the bandwidth request preamble has been received in response to the bandwidth request information,
Wherein the bandwidth request channel comprises a plurality of bandwidth request tiles, each of the bandwidth request tiles including a preamble tone part and a data tone part,
The preamble tone portion includes four subcarriers and six OFDM symbols (orthogonal frequency division multiplexing symbols) for transmission of the bandwidth request preamble,
The data tone portion includes two consecutive subcarriers and six OFDM symbols for transmission of data including a quick access message,
Wherein the two consecutive subcarriers of the data tone portion and the six OFDM symbols in the case where the plurality of bandwidth request tiles include null tones are used for transmission of the null tones instead of transmission of the data. . A base station for receiving a signal through a bandwidth request channel in a wireless communication system,
A receiver for receiving bandwidth request information including a bandwidth request preamble from the terminal through the bandwidth request channel; And
And a transmitter for transmitting to the terminal a message indicating that the bandwidth request preamble has been received in response to the bandwidth request information,
Wherein the bandwidth request channel comprises a plurality of bandwidth request tiles, each of the bandwidth request tiles including a preamble tone part and a data tone part,
The preamble tone portion includes four subcarriers and six OFDM symbols (orthogonal frequency division multiplexing symbols) for transmission of the bandwidth request preamble,
The data tone portion includes two consecutive subcarriers and six OFDM symbols for transmission of data including a quick access message,
Wherein the two consecutive subcarriers of the data tone portion and the six OFDM symbols in the case where the plurality of bandwidth request tiles include null tones are used for transmission of the null tones instead of transmission of the data. Used base station. delete delete delete delete delete delete delete delete delete delete

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