KR100975227B1 - Channel allocation system for multiuser resource sharing and channel allocation method for multiuser resource sharing - Google Patents

Abstract

Channel allocation system for multi-user resource sharing and channel allocation method for multi-user resource sharing to efficiently allocate channels for multi-user resource sharing to improve signal quality of users with low signal quality through multi-user resource sharing Is disclosed. In the channel allocation system for multi-user resource sharing of the present invention, the terminal is assigned to each communication channel and at least one group including a plurality of terminals according to a predetermined signal quality standard, and the plurality of terminals Among the communication channels assigned to the plurality of terminals sequentially from among the terminals having low signal quality, the communication channels having a large channel gain are selected and assigned to the corresponding terminals, and the plurality of signals are transmitted to transmit the signals through the assigned allocation channels. It includes a base station for controlling each terminal.

Multi-user, signal quality, base station, group

Description

Channel allocation system for multi-user resource sharing and channel allocation method for multi-user resource sharing {CHANNEL ALLOCATION SYSTEM FOR MULTIUSER RESOURCE SHARING AND CHANNEL ALLOCATION METHOD FOR MULTIUSER RESOURCE SHARING}

The present invention relates to a channel allocation system for multi-user resource sharing, and more particularly, to efficiently allocate a channel for multi-user resource sharing in order to improve signal quality of a user having low signal quality through resource sharing of multi-user. A channel allocation system for multi-user resource sharing and a channel allocation method for multi-user resource sharing.

At present, a third generation mobile communication system for transmitting data at higher speed has been developed as a mobile telecommunication system is rapidly developed and the amount of data for a service based on the mobile communication system is rapidly increased. This third generation mobile communication system standardizes WCDMA (Wideband Code Division Multiple Access), which is asynchronous between base stations, and CDMA2000 (Multiple Carrier Code Division Multiple Access), which is a synchronous method between base stations, in North America. The communication system is generally configured in such a way that multiple terminals (MSs) communicate with each other through one base station. However, a phase of a received signal is distorted due to fading phenomenon occurring on a wireless channel during high speed data transmission in a mobile communication system. Since the fading reduces the amplitude of the received signal from a few dB to several tens of dB, the phase of the received signal distorted by the fading phenomenon is a source of information error of the transmitted data transmitted from the transmitting side when compensation is not performed during data demodulation. This causes a decrease in the quality of the mobile communication service. Therefore, in order to transmit high-speed data without deteriorating the quality of service in a mobile communication system, fading must be overcome, and various methods of diversity are used to overcome such fading.

In this diversity scheme, a base station includes a plurality of antennas, and a terminal transmits / receives a signal to a plurality of antennas of the base station through a plurality of shared channels, so that the signal transmitted through the antenna has its signal size due to fading phenomenon. If is decreased, this is a technique for receiving signals transmitted through the other antennas. Accordingly, the fading phenomenon can be overcome to some extent by applying the diversity technique.

However, even if the diversity scheme is applied, if a terminal having a poor quality of a transmitted signal occurs because it is located in an environmental element, especially a cell boundary region, among several terminals communicating with one base station, this problem can be solved. There is no way. Accordingly, in order to solve the above problem, a method of applying a conventional Collaborative Spatial Multiplexing (CSM) technique can be considered.

However, even when the CSM technology is applied, the terminal generally uses a single antenna, and the base station has a disadvantage in that the number of receiving antennas is greater than the number of cooperative users. In addition, in the uplink, unlike the base station, since the amount of available transmission power of the terminal itself is limited, there is a limit in improving signal quality.

The present invention has been made in view of the above circumstances, and the present invention sets up at least one group including a plurality of terminals according to preset signal quality criteria and terminals assigned to each communication channel. Selecting a communication channel having a large channel gain among the communication channels allocated to the plurality of terminals sequentially from a terminal having a low signal quality among the plurality of terminals and assigning the communication channel to the corresponding terminal, and transmitting a signal through the assigned allocation channel. It is to provide a channel allocation system for multi-user resource sharing, characterized in that it comprises a base station for controlling each of a plurality of terminals.

The present invention has been made in view of the above circumstances, and the present invention is based on the signals received from the terminals assigned to each communication channel, the base station determines the signal quality of each of the terminals, and the signal quality Setting at least one group including a plurality of terminals according to a preset signal quality criterion based on the determination result, and sequentially from the terminals having the lowest signal quality among the plurality of terminals based on the signal quality determination result Selecting a communication channel having a large channel gain among the communication channels assigned to the plurality of terminals and assigning the communication channel to the corresponding terminal; and controlling the plurality of terminals to transmit signals through the assigned channel, respectively. To provide a channel allocation method for multi-user resource sharing, characterized in that it comprises a The.

The present invention has been made in view of the above circumstances, and the present invention determines a signal quality of a plurality of terminals allocated to each communication channel and signals received from the plurality of terminals, and determines a signal among the plurality of terminals. A plurality of terminals are selected so as to sequentially select a communication channel having a large channel gain among the communication channels allocated to the plurality of terminals from the terminals having low quality and assign them to the corresponding terminals, and transmit a signal through the assigned channel. It is to provide a channel allocation system for multi-user resource sharing, characterized in that it comprises a base station for controlling each.

According to a first aspect of the present invention, there is provided a channel allocation system for multi-user resource sharing, comprising: terminals allocated to respective communication channels; And setting at least one group including a plurality of terminals according to a preset signal quality criterion, and gaining a channel among the communication channels assigned to the plurality of terminals sequentially from a terminal having a lower signal quality among the plurality of terminals. And a base station for controlling the plurality of terminals to select and assign the large communication channel to the corresponding terminal and to transmit a signal through the assigned allocation channel.

Preferably, the base station comprises a first communication channel having the highest channel gain among the respective communication channels assigned to the plurality of terminals included in the same group to the first terminal having the lowest signal quality among the plurality of terminals. The second communication channel having the highest channel gain among the remaining communication channels may be allocated to the second terminal having the lowest signal quality among the remaining terminals.

Preferably, the first communication channel and the second communication channel are orthogonal channels which are orthogonal to each other.

Preferably, the base station can control the plurality of terminals to transmit a signal having the maximum transmission power.

Preferably, the base station may determine the signal quality of each of the terminals based on the signal to noise ratio (SNR) of each of the terminals returned from the terminals by a downlink pilot signal.

Preferably, the base station may determine the signal quality of each of the terminals based on the Signal to Interference Plus Noise Ratio (SINR) of each of the terminals returned from the terminals by a downlink pilot signal.

Preferably, the base station includes at least one antenna and is based on the MN MIMO (Multiple Input Multiple Output) formed according to the plurality of terminals (M) and the number of antennas (N). The channel gain h of the plurality of terminals corresponding to the communication channel can be obtained.

Preferably, the base station, based on the channel gain (h) of the plurality of terminals corresponding to the respective communication channel obtained, the channel gain (h) between each communication channel corresponding to the first terminal having the lowest signal quality (h) Selects a first communication channel corresponding to the highest channel gain (h) by comparing the size and allocates the first communication channel to the assigned channel to the first terminal, and the remaining respective communication corresponding to the second terminal having the lowest signal quality among the remaining terminals. By comparing the magnitude of the channel gains (h) between the channels, a second communication channel corresponding to the highest channel gain (h) may be selected and allocated to the allocation channel to the second terminal.

Preferably, the base station is a transmission signal (s) transmitted by the plurality of terminals based on the received signal (r) received from the plurality of terminals included in the same group and the channel gain (h) of the plurality of terminals. ), The channel gain matrix of the channel gain matrix (H) and the channel gains (h) between the respective terminals of the channel gains (h) other than the channel gain (h) corresponding to the corresponding allocated channel of each terminal By setting the value to “0”, the transmission signals s of the plurality of terminals can be detected.

수식

Equation

은, 공유채널(FM)을 통해 단말기(UM)로부터 수신한 수신신호,

는, 공유채널(FM)을 통한 단말기(UM) 및 기지국의 안테나(AN)간의 채널이득,

는, 단말기(UM)가 송신하는 송신신호,

은, 공유채널(FM)을 통한 안테나(AN)로의 신호 수신 시 노이즈이다.here,

Is a received signal received from the terminal UM through the shared channel FM,

The channel gain between the terminal (UM) and the antenna (AN) of the base station through the shared channel (FM),

Is a transmission signal transmitted by the terminal UM,

Is noise at the time of signal reception to the antenna AN via the shared channel FM.

According to a second aspect of the present invention, there is provided a channel allocation method for multi-user resource sharing based on a signal received from terminals allocated to respective communication channels. Determining signal quality; Setting at least one group including a plurality of terminals according to a preset signal quality criterion based on a signal quality determination result; Selecting a communication channel having a large channel gain among the communication channels assigned to the plurality of terminals sequentially from a terminal having a low signal quality among the plurality of terminals and assigning the communication channel having a large channel gain to the corresponding terminal; And controlling each of the plurality of terminals to transmit a signal through each assigned allocation channel.

Preferably, the step of allocating, based on a signal quality determination result, of the respective communication channels assigned to the plurality of terminals included in the same group in the first terminal having the lowest signal quality among the plurality of terminals Allocating a first communication channel having the highest channel gain and allocating a second communication channel having the highest channel gain among the remaining communication channels to a second terminal having the lowest signal quality among the remaining terminals.

Preferably, the first communication channel and the second communication channel are orthogonal channels which are orthogonal to each other.

Preferably, the controlling of the plurality of terminals may control the plurality of terminals to transmit a signal having a maximum transmission power.

Preferably, the step of determining the signal quality, the step of transmitting a downlink pilot signal to the terminals, and based on the SINR (Signal to Interference Plus Noise Ratio) of each terminal returned from the terminals Determining each of the signal quality may include.

Preferably, the step of determining the signal quality, the step of transmitting a downlink pilot signal to the terminals, and based on the SINR (Signal to Interference Plus Noise Ratio) of each terminal returned from the terminals Determining each of the signal quality may include.

Preferably, the allocating step is based on the M × N multiple input multiple output (MIMO) formed according to the number of terminals M and the number of antennas N of the base station. And acquiring channel gains h of the plurality of terminals corresponding to.

Preferably, the allocating step includes a channel between each communication channel corresponding to the first terminal having the lowest signal quality based on the channel gains h of the plurality of terminals corresponding to the respective communication channels. Selecting the first communication channel corresponding to the highest channel gain (h) by comparing the magnitude of the gain (h) and allocating the first communication channel to the assigned channel to the second terminal having the lowest signal quality among the remaining terminals; The second communication channel corresponding to the highest channel gain h may be selected by comparing the magnitude of channel gain h between each corresponding communication channel and allocated to the second terminal.

Preferably, the transmission signal s transmitted by the plurality of terminals is detected based on the reception signal r received from the plurality of terminals included in the same group and the channel gain h of the plurality of terminals. It may further comprise a step.

Preferably, the detecting of the transmission signal s may include: in the equation for detecting the transmission signal s transmitted by the plurality of terminals, the communication channels of the channel gain matrix H and the respective terminals; Setting a channel gain value other than the channel gain (h) corresponding to the corresponding allocation channel of each terminal among the channel gains (h) between " 0 " and the transmission signal (s) transmitted by the plurality of configured terminals; Detecting a transmission signal s of the plurality of terminals based on a formula for detecting a).

수식

Equation

은, 공유채널(FM)을 통해 단말기(UM)로부터 수신한 수신신호,

는, 공유채널(FM)을 통한 단말기(UM) 및 기지국의 안테나(AN)간의 채널이득,

는, 단말기(UM)가 송신하는 송신신호,

은, 공유채널(FM)을 통한 안테나(AN)로의 신호 수신 시 노이즈이다.here,

Is a received signal received from the terminal UM through the shared channel FM,

The channel gain between the terminal (UM) and the antenna (AN) of the base station through the shared channel (FM),

Is a transmission signal transmitted by the terminal UM,

Is noise at the time of signal reception to the antenna AN via the shared channel FM.

According to a third aspect of the present invention, there is provided a channel allocation system for multi-user resource sharing, comprising: a plurality of terminals allocated to respective communication channels; And determining a signal quality of a signal received from the plurality of terminals, and selecting a communication channel having a large channel gain among the communication channels allocated to the plurality of terminals sequentially from a terminal having a low signal quality among the plurality of terminals. And a base station for controlling the plurality of terminals to select and assign the terminal to the corresponding terminal and to transmit a signal through the assigned channel.

Preferably, the base station allocates a first communication channel having the highest channel gain among the respective communication channels assigned to the plurality of terminals to the first terminal having the lowest signal quality among the plurality of terminals, and the remaining terminals. A second communication channel having the highest channel gain among the remaining communication channels can be allocated to the second terminal having the lowest signal quality.

Preferably, the first communication channel and the second communication channel are orthogonal channels which are orthogonal to each other.

Preferably, the base station can control the plurality of terminals to repeatedly transmit a signal having the maximum transmission power.

As described above, according to the channel allocation system for multi-user resource sharing and the channel allocation method for multi-user resource sharing, the terminal having the lowest signal quality among a plurality of terminals in a group that can use a plurality of communication channels has priority. By repeating the sequential process of selecting a communication channel having the largest channel gain among the communication channels corresponding to the corresponding terminal and orthogonal to the communication channel previously allocated to the other terminal and allocating the terminal to the corresponding terminal, By assigning each allocation channel to each other, and controlling each of a plurality of terminals to transmit a signal through each assigned allocation channel, since the signal quality is located in the cell boundary region without affecting the signal quality of the terminal, Improve the signal quality of the terminal of poor signal quality, The terminal has an effect capable of preventing a mutual interference between the respective terminals as it is possible to maximize channel diversity gain through multi-path, the orthogonal channel is assigned to each terminal.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

Channel allocation system for multi-user resource sharing of the present invention, as shown in Figure 1, includes a base station 20, a plurality of terminals for transmitting and receiving signals with the base station 20. In this case, it is preferable that terminals are allocated to respective communication channels.

The base station 20 determines the quality of signals received from a plurality of terminals, sets at least one group including a plurality of terminals according to a preset signal quality criterion, and has a terminal having a low signal quality among the plurality of terminals. From among the communication channels assigned to the plurality of terminals sequentially from among the communication channels having a large channel gain is selected and assigned to the corresponding terminal, and controls the plurality of terminals to transmit a signal through the assigned channel.

Hereinafter, the configuration of the base station 20 and the signal transmission / reception between the base station 20 and the plurality of terminals in the channel allocation system for multi-user resource sharing according to the present invention will be described with reference to FIG. 2.

As shown in FIG. 2, the base station 20 includes a signal quality determination module 21 for determining signal quality of signals received from at least one antenna 10 and external terminals allocated to respective communication channels. And a group scheduler 22 for setting at least one group 1 and 2 including a plurality of terminals according to preset signal quality criteria based on the determination result of the signal quality determination module 21, and a signal. Based on the determination result of the quality judging module 21, a communication channel having a large channel gain is selected from among the communication channels assigned to the plurality of terminals sequentially from the terminals having low signal quality among the plurality of terminals and assigned to the corresponding terminals. And a control module 24 for controlling each of the plurality of terminals to transmit a signal through the assigned allocation channel. Here, the number of each communication channel is the same as the number M of the plurality of terminals in the group, and the number of antennas 10 of the base station 20 is N.

Hereinafter, the signal quality determination module 21, the group scheduler 22, and the control module 24 will be described in more detail.

The signal quality determining module 21 determines the signal quality of each terminal based on signals received from external terminals allocated to each communication channel. The signal quality determination module 21 periodically transmits a downlink pilot signal to the terminals. Accordingly, the signal quality determining module 21 may determine the signal quality of each terminal based on a predetermined signal returned from the terminals in response to the pilot signal.

Here, as one measurement example for determining the signal quality, based on the signal to noise ratio (SNR) returned from the terminals to the base station 20 by the downlink pilot signal, the signal quality determination module 21 is the It is desirable to determine the signal quality. That is, the predetermined signal returned from the terminals in response to the pilot signal may be an SNR. In general, larger SNR results in better signal quality, and lower SNR results in poor signal quality. In addition, the signal quality determining module 21 may determine the signal quality of each terminal based on the Signal to Interference Plus Noise Ratio (SINR) returned from the terminals by the downlink pilot signal. That is, the predetermined signal returned in response to the pilot signal from the terminals may be SINR. Hereinafter, for convenience of description, the signal quality will be described based on the SNR.

As such, the base station 20 periodically transmits a downlink pilot signal to terminals existing within its cell area, and may determine signal quality of each terminal based on an SNR of each terminal returned corresponding thereto. have.

The group scheduler 22 determines the signal quality of each terminal based on the determination result of the signal quality determination module 21 and sets at least one group including a plurality of terminals according to a preset signal quality standard. Here, the signal quality criterion may be the most preferable grouping criterion set in advance for dividing and setting various terminals existing in the cell area of the base station 20 into a group including a plurality of terminals in consideration of the signal quality of each terminal. The signal quality standard is preferably a result obtained through several experiments. Of course, the group scheduler 22 may divide and set various terminals existing in the cell area of the base station 20 into at least one group including a plurality of terminals by applying a conventional grouping scheme.

Here, when the group scheduler 22 sets at least one group 1 and 2 including a plurality of terminals, it is preferable to set terminals having a large difference in SNR as one group. A terminal with a high SNR, that is, a good signal quality, has almost no performance degradation regardless of the order in which communication channels are allocated.However, a terminal with a low SNR, that is, a poor signal quality, has a fluctuation in performance due to channel gain. Since the signal quality can be large, the terminal having a low signal quality has a priority in selecting a communication channel.

That is, the group scheduler 22 grasps the signal quality of each terminal based on the determination result of the signal quality determination module 21, and the terminals having a large difference in SNR (for example, terminals close to the cell center and close to the cell boundary). It is preferable to set the terminal) to one group.

As such, the base station 20 includes a group 1 including a plurality of terminals U1 and U2 and a plurality of terminals U1 ', U2', and U3 'according to the signal quality of terminals existing within its cell area. , U4 ') can be set. That is, the number of communication channels M of the group 1 is equal to the number of two terminals in the group 1, and the number of communication channels M of the group 2 is equal to the number of four terminals in the group 2.

The control module 24 is assigned to each of the plurality of terminals included in the same group in the first terminal having the lowest signal quality among the plurality of terminals set in the group, based on the determination result of the signal quality determining module 21. The first communication channel having the highest channel gain among the communication channels is allocated, and the second communication channel having the highest channel gain among the remaining communication channels is allocated to the second terminal having the lowest signal quality among the remaining terminals. Here, the first communication channel and the second communication channel are preferably orthogonal channels which are orthogonal to each other.

That is, the control module 24, based on the determination result of the signal quality determination module 21, the first terminal having the highest channel gain of each communication channel to the first terminal having the lowest signal quality among the plurality of terminals set in the group It is preferable to allocate one communication channel, and assign a second communication channel having the highest channel gain among the remaining communication channels and orthogonal to the first communication channel to a second terminal having the lowest signal quality among the remaining terminals.

Here, the process of allocating a communication channel will be described in more detail.

As described above, the base station 20 has a plurality of antennas 10 as shown in FIG. 2, and the number of antennas 10 is N.

The control module 24 is based on the number M of terminals grouped into one group and the number N of antennas N, and the communication channels F1 and F2 are based on M × N multiple input multiple outputs (MIMO). … Obtain channel gain h of each of the plurality of terminals corresponding to FM).

Here, the channel gain matrix H by M × N MIMO is as follows.

H =

을 설명하면 (1)은 신호를 송신하는 통신채널(F1)을 의미하고 12에서 2는 그룹 내에서 신호를 송신하는 단말기(U2), 1은 신호를 수신하는 기지국(20)의 안테나(A1)를 의미한다. 즉

는, 통신채널(F1)을 통한 단말기(U2) 및 기지국(20) 제1안테나(A1)간의 채널이득이다.Here, h means channel gain, for example

1 denotes a communication channel F1 for transmitting a signal, 12 to 2 denote a terminal U2 for transmitting a signal within a group, and 1 denotes an antenna A1 of a base station 20 for receiving a signal. Means. In other words

Is the channel gain between the terminal U2 and the base station 20 first antenna A1 via the communication channel F1.

The control module 24 gives priority to the first terminal having the lowest signal quality based on the channel gain h of each of the plurality of terminals corresponding to the obtained communication channels F1, F2... FM. The magnitude of the channel gain (h) for each communication channel corresponding to the one terminal is compared. The control module 24 selects the first communication channel corresponding to the highest channel gain h among the channel gains h for each communication channel corresponding to the first terminal, and assigns the first communication channel to the first terminal as an allocation channel. . Subsequently, the control module 24 gives priority to the second terminal having the lowest signal quality among the remaining terminals except the first terminal, and performs each remaining communication channel except the first communication channel corresponding to the second terminal. The magnitudes of the channel gains (h) are compared, the second communication channel corresponding to the highest channel gain (h) is selected, and the second channel is allocated to the second terminal.

As such, the control module 24 selects the communication channel having the largest channel gain h among the communication channels corresponding to the terminal from the terminal having the lowest signal quality among the plurality of terminals in the group and assigns the communication channel to the corresponding terminal. By repeating the sequential process, each allocation channel can be allocated to a plurality of terminals in the group.

In addition, the control module 24 controls each of the plurality of terminals to transmit a signal through the assigned allocation channel. In this case, the control module 24 preferably controls a plurality of terminals to repeatedly transmit a signal having the maximum transmission power through the assigned channel.

3A and 3B, according to the present invention, M terminals (U1, U2, ... UM) are set to one group, and transmission power of M signals transmitted through M communication channels by M terminals is set. It shows for each communication channel, it will be described 1N SIMO corresponding to the communication channel (FM), that is, the terminal (UM) through the allocation channel assigned to the terminal (UM).

과,

과, …

을 획득하여 각각을 비교한다. 여기서, 각 단말기(U1,U2…UM)의 SNR 크기가 U1 < UM < … < U2 이고, 단말기(U1)의 신호품질이 가장 낮고, 단말기(U2)의 신호품질이 가장 높은 것으로 설명한다.The control module 24 has the best signal quality among the M terminals (U1, U2 ... UM) in the group based on M × N MIMO formed according to the number of terminals M and the number N of antennas. Channel gain (h) for each communication channel (F1, F2, ..., FM) corresponding to the terminal (U1) in preference to the terminal (eg, the terminal (U1)) corresponding to the first terminal device having the lowest signal quality.

and,

And,…

Obtain each and compare each. Here, the SNR sizes of the terminals U1, U2, ... UM are U1 <UM <. <U2, the signal quality of the terminal U1 is the lowest, and the signal quality of the terminal U2 is the highest.

이 가장 크다고 가정하면, 제어모듈(24)은 비교결과 통신채널(F1)에 대응하는

이 가장 크다고 판단하고, 단말기(U1)의 할당채널로서 통신채널(F1)을 할당한다. Accordingly, the control module 24 determines the corresponding first communication channel having the largest channel gain h having the largest size. Here, the channel gain corresponding to the communication channel (F1)

Is assumed to be the largest, the control module 24 corresponds to the communication channel F1 as a result of the comparison.

Is determined to be the largest, and the communication channel F1 is assigned as the allocation channel of the terminal U1.

In addition, the control module 24 gives priority to the terminal UM corresponding to the second terminal having the lowest signal quality among the remaining terminals U2... UM except for the terminal U1, and has the remaining angles corresponding to the terminal U2. The magnitudes of the channel gains h of each communication channel F2... FM except for the communication channel F2... FM are compared.

이 가장 크고 통신채널(FM)이 통신채널(F1)에 직교한다고 가정하면, 제어모듈(24)은 비교결과 통신채널(FM)에 대응하는

이 가장 크다고 판단하고, 단말기(UM)의 할당채널로서 통신채널(FM)을 할당한다.Accordingly, the control module 24 determines the corresponding second communication channel having the largest channel gain h having the largest size. Here, the channel gain corresponding to the communication channel (FM)

Assuming that this largest and communication channel FM is orthogonal to the communication channel F1, the control module 24 corresponds to the communication channel FM as a result of the comparison.

Is determined to be the largest, and the communication channel FM is allocated as the allocation channel of the terminal UM.

As such, the control module 24 first selects the communication channel having the largest channel gain h among the communication channels corresponding to the terminal, and assigns the communication channel to the terminal, starting from the terminal having the lowest signal quality among the plurality of terminals in the group. First of all, the terminal having the lowest signal quality among the remaining terminals selects a communication channel having the largest channel gain (h) among the remaining communication channels corresponding to the corresponding terminal and is orthogonal to the first allocated communication channel, and assigns the terminal to the corresponding terminal. Repeat the process. Then, the control module 24 allocates the allocation channels in order of the terminals having the lowest signal quality, and then the last remaining communication channel (for example, the communication channel F2) to the last terminal in the group, that is, the terminal U2 having the highest signal quality. ) Is allocated as an allocation channel.

Thus, as shown in Figure 3a, the control module 24 controls each of the plurality of terminals (U1, U2 ... UM) to transmit a signal through the assigned channel assigned to it.

), 단말기(UM)가 통신채널(FM)을 통해 안테나(A1)로 송신하는 채널이득

, 단말기(UM)가 통신채널(FM)을 통해 안테나(A2)로 송신하는 채널이득

, ... 단말기(UM)가 통신채널(FM)을 통해 안테나(AN)로 송신하는 채널이득

등에 기초한 1×N SIMO의 채널환경을 얻을 수 있다. Thus, referring to the terminal UM, as shown in FIG. 3B, the base station 20 selects the communication channel FM in which the terminal UM allocated as the communication channel FM is an allocation channel. Transmission signal transmitted through

Channel gain that the terminal UM transmits to the antenna A1 via the communication channel FM.

, Channel gain that the terminal UM transmits to the antenna A2 through the communication channel FM

, ... channel gain that the terminal (UM) transmits to the antenna (AN) via the communication channel (FM)

A channel environment of 1 × N SIMO based on the above can be obtained.

Accordingly, in the channel allocation system for multi-user resource sharing according to the present invention, the terminal having the lowest signal quality among a plurality of terminals in a group that can use a plurality of communication channels, preferentially, among each communication channel corresponding to the terminal. Repeat the sequential process of selecting the communication channel having the largest channel gain (h) and orthogonal to the communication channel previously allocated to another terminal and allocating the corresponding channel to the terminal, and assigning each allocation channel to a plurality of terminals in the group. By controlling each of a plurality of terminals to transmit a signal through each assigned allocation channel, the signal of a terminal having a poor quality of a transmitted signal because it is located in a cell boundary region without affecting the signal quality of a good terminal which is a signal quality Improve quality, and each terminal maximizes channel diversity gain through multipath As the orthogonal channel is assigned to each terminal, mutual interference can be prevented.

Hereinafter, with reference to FIGS. 4A, 4B, and 4C, two terminals U1 and U2 are set to one group 1, the signal quality of U1 is higher than the signal quality of U2, and the base station 20 has two. With the embodiment having two antennas A1 and A2, the present invention will be described.

The control module 24 is based on 2 2 MIMO (Multiple Input Multiple Output) in which two terminals U1 and U2 and a base station 20 are grouped together according to two antennas A1 and A2. The channel gain h of each of the terminals U1 and U2 corresponding to the communication channels F1 and F2 is obtained.

Here, the channel gain matrix H by 2x2 MIMO is as follows.

H =

과,

을 획득하여 각각을 비교한다. 여기서, 통신채널(F2)에 대응하는 채널이득

이 크다고 가정한다. 이에, 제어모듈(24)은 채널이득이 가장 크다고 판단되는 통신채널(F2)을 단말기(U2)의 할당채널로서 할당한다. The control module 24 gives priority to the terminal U2 having the lowest signal quality among the terminals U1 and U2 in the group based on 2x2 MIMO, and corresponds to the terminal U2. Channel gain (h) for each communication channel (F1, F2)

and,

Obtain each and compare each. Here, the channel gain corresponding to the communication channel (F2)

Assume this is large. Accordingly, the control module 24 allocates the communication channel F2, which is determined to have the largest channel gain, as the allocation channel of the terminal U2.

The control module 24 allocates the last remaining communication channel F1 as an allocation channel to the terminal U1 which is the last terminal and the last terminal.

Thus, as shown in Figure 4b, the control module 24 controls the terminals (U1, U2) to transmit a signal through the allocation channel assigned to them, respectively.

As described above, according to the channel allocation system for multi-user resource sharing according to the present invention, the channel gain of each communication channel corresponding to the corresponding terminal is given priority, starting from the terminal having the lowest signal quality among the plurality of terminals U1 and U2 in the group. (h) is the largest and selects the communication channel orthogonal to the communication channel previously assigned to the other terminal and repeats the sequential process of allocating the corresponding channel to the plurality of terminals (U1, U2) in the group. By assigning and controlling each of the plurality of terminals U1 and U2 to transmit a signal through each assigned allocation channel, so as to be located in the cell boundary region without affecting the signal quality of the good terminal U1 which is the signal quality Therefore, the signal quality of the terminal U2 having a poor quality of the transmitted signal can be improved, and each terminal U1 and U2 maximize the channel diversity gain through the multipath. Can and, it is possible to prevent mutual interference as the orthogonal channel is assigned to each terminal (U1, U2).

As such, since the terminal U2 transmits a signal to the communication channel F2 assigned to the terminal U1 and the terminal U1 transmits a signal to the communication channel F1 assigned to the terminal U2, the base station 20 transmits the signal to (a) of FIG. As shown in FIG. 6, a transmission signal transmitted through the communication channel F2 allocated by the terminal U2 as an allocation channel, a channel gain transmitted to the antenna A1 and the antenna A2 through the communication channel F2, and the like. Based on the channel environment of 1 × 2 SIMO, a transmission signal and a communication channel transmitted through the communication channel F1 allocated by the terminal U1 as an allocation channel can be obtained, as shown in FIG. 4A (b). Through F1), it is possible to obtain a channel environment of 1x2 SIMO based on the channel gain transmitted to the antenna A1 and the antenna A2.

과,

을 획득하여 각각을 비교한 결과, 통신채널(F1)에 대응하는 채널이득

이 크다고 가정한다면, 제어모듈(24)은 채널이득이 가장 크다고 판단되는 통신채널(F1)을 단말기(U2)의 할당채널로서 할당하고, 나머지 단말기이면서 마지막 단말기인 단말기(U1)에는 마지막 남은 통신채널(F2)을 할당채널로서 할당할 것이다.On the other hand, the control module 24 gives priority to the terminal U2 having the lowest signal quality among the terminals U1 and U2 in the group based on 2x2 MIMO, and corresponds to the terminal U2. Channel gain (h) for each communication channel (F1, F2)

and,

As a result of acquiring the result of comparison, the channel gain corresponding to the communication channel F1 is obtained.

Is assumed to be large, the control module 24 allocates the communication channel F1, which is determined to have the largest channel gain, as the allocation channel of the terminal U2, and the last remaining communication channel to the terminal U1, which is the last terminal and the last terminal. (F2) will be allocated as the allocation channel.

Accordingly, as shown in FIG. 4C, the control module 24 controls the terminals U1 and U2 to transmit signals through the allocation channel allocated to the control module 24.

Here, the base station 20 should detect the transmission signal transmitted by the terminal based on the reception signals received from the plurality of terminals, and transmit the transmission signal to the corresponding destination (another terminal or another base station). To this end, the base station 20 must detect the transmission signals transmitted from the plurality of terminals from the received signals, respectively.

Thus, in the channel allocation system for multi-user resource sharing of the present invention, the base station 20 knows the received signal r and the channel gain h received from a plurality of terminals set to the same group, and thus, the received signal ( Based on r) and channel gain h, a matrix model can be obtained as shown in Equation (1) below to detect the transmission signal s transmitted by each of the plurality of terminals.

수식(1)

Formula (1)

은, 공유채널(FM)을 통해 단말기(UM)로부터 수신한 수신신호,

는, 공유채널(FM)을 통한 단말기(UM) 및 기지국의 안테나(AN)간의 채널이득,

는, 단말기(UM)가 송신하는 송신신호,

은, 공유채널(FM)을 통한 안테나(AN)로의 신호 수신 시 노이즈이다.This matrix model is generally based on the base station side received signal r = channel gain h, which is a formula for detecting the transmission signal s of the terminal, and the terminal side transmitted signal s + noise n. here,

Is a received signal received from the terminal UM through the shared channel FM,

The channel gain between the terminal (UM) and the antenna (AN) of the base station through the shared channel (FM),

Is a transmission signal transmitted by the terminal UM,

Is noise at the time of signal reception to the antenna AN via the shared channel FM.

Herein, the control module 24 calculates the remaining channel gain value except for the channel gain h corresponding to the corresponding allocation channel of each terminal among the channel gains h between each communication channel and each terminal in the channel gain matrix H. 0 ”and the transmission signal s of each of a plurality of terminals is detected through the matrix model thus set.

For clarity, the matrix model for detecting the transmission signals S1 and S2 by the base station 20 will be described below by taking the embodiment of FIG. 4B as an example.

)을 알고 채널이득행렬(H)을 알고 있다. 여기서, 단말기(U2)의 할당채널은 통신채널(F2), 단말기(U1)의 할당채널은 통신채널(F1)이다. The control module 24 of the base station 20 receives signals for each communication channel F1 and F2 received from two terminals U1 and U2.

) And the channel gain matrix (H). Here, the allocation channel of the terminal U2 is the communication channel F2, and the allocation channel of the terminal U1 is the communication channel F1.

Thus, the control module 24 obtains a matrix model as shown in Equation (2) below.

수식(2)

Formula (2)

That is, Equation (2) is applied to the corresponding allocation channels of the terminals U1 and U2 among the channel gains h between the communication channels F1 and F2 and the terminals U1 and U2 in the channel gain matrix H. Set the channel gain value other than the corresponding channel gain h to “0”, that is, corresponding to the terminal U2 among the channel gains h between the communication channels F1 and F2 and the terminal U2. Set the channel gain value other than the channel gain h corresponding to the communication channel F2, which is the assigned channel, to “0”, and among the channel gains h between the communication channels F1 and F2 and the terminal U1. A channel gain value other than the channel gain h corresponding to the communication channel F1 corresponding to the corresponding allocation channel of the terminal U1 is set to “0”. That is, when each control module 20 controls each terminal (U1, U2) to transmit a signal, the terminal (U2) transmits a signal through the communication channel (F2) that is the corresponding allocation channel, the terminal (U1) Is a result of assigning each communication channel to each terminal U1 and U2 so as to transmit a signal through the communication channel F1, which is a corresponding allocation channel orthogonal to the communication channel F2.

Accordingly, the control module 24 may detect the transmission signals S1 and S2 of the terminals U1 and U2 based on Equation (2) corresponding to the channel environment of 1 × 2 SIMO. At this time, the control module 24 detects each transmission signal based on Equation (2) of the present invention, since terminals are allocated for each orthogonal communication channel, that is, signals of several terminals are not received in one communication channel. Since it is independent, it is not necessary to adopt a detection scheme such as the VBLAST technique using the optimal odering based on the channel environment of the conventional M × N MIMO.

Therefore, since the channel allocation system for multi-user resource sharing according to the present invention independently assigns orthogonal communication channels for each terminal, the base station 20 detects a transmission signal from a reception signal received from each terminal. The receiver (not shown) structure of the base station 20 may also lead to a simplified effect.

Hereinafter, referring to FIG. 5, a channel allocation method for multi-user resource sharing in the channel allocation system for multi-user resource sharing of the present invention as described above will be described.

First, the base station 20 presets a signal quality standard for setting terminals in its cell area as a group (S10). In addition, the base station 20 determines the signal quality of each of the terminals based on the signals received from the terminals assigned the respective communication channels (S20).

As described above in more detail the step S20 of determining the signal quality, the signal quality determination module 21 of the base station periodically transmits the downlink pilot signal to the terminals (S22). Accordingly, the signal quality determination module 21 receives a predetermined signal returned from the terminals in response to the pilot signal, for example, a signal to noise ratio (SNR) to be returned (S24), and based on the received SNR, The signal quality of each of these is determined (S26).

 Then, the base station 20 determines the signal quality of each terminal based on the determination result of the signal quality determination module 21, and sets at least one group including a plurality of terminals according to the preset signal quality criteria ( S30).

 The base station 20 compares each signal quality of a plurality of terminals belonging to the group for each group, and recognizes the priority in order from the terminal having the lowest signal quality to the terminal having the highest signal quality (S40). The base station 20 receives channel gains of each of the plurality of terminals corresponding to the communication channels F1, F2... FM according to the number N of the plurality of terminals in the group and the antennas 10 of the base station 20. h) is obtained (S50). As described above, acquiring the channel gain h of each of the plurality of terminals corresponding to each communication channel F1, F2 ... FM is based on the number M of terminals and the number N of antennas in the group. Can be obtained on the basis of × N MIMO (Multiple Input Multiple Output), the channel gain matrix (H) by M × N MIMO is as follows.

H =

In addition, the base station 20 stores a plurality of terminals corresponding to each of the acquired communication channels F1, F2, ... FM according to the priority order from the terminal having the lowest signal quality recognized in the step S40 to the terminal having the highest signal quality. Based on the channel gain h, the communication channel having the highest channel gain is sequentially selected among the communication channels starting from the terminal having the lowest signal quality and assigned to the terminal as an allocation channel (S60). At this time, the allocation channel allocated to the terminal is preferably an orthogonal channel orthogonal to the allocation channel allocated to the previous terminal.

Here, step S60 will be described in more detail with reference to FIG. 6. First, the control module 24 of the base station 20 prioritizes the first terminal of the lowest signal quality according to the priority in order from the terminal of the lowest signal quality to the terminal of the highest signal quality recognized in step S40. The magnitude of the channel gain (h) for each communication channel corresponding to the terminal is compared (S61). Then, the control module 24 selects the first communication channel corresponding to the highest channel gain (h) of the channel gain (h) for each communication channel corresponding to the first terminal as a result of the comparison and assigns it to the assigned channel to the first terminal. (S62).

The control module 24 prioritizes the second terminal having the lowest signal quality among the remaining terminals except the first terminal, and the remaining respective communication channels corresponding to the second terminal, that is, the channels for each remaining communication channel except the first communication channel. The magnitude of the gain h is compared (S63). The control module 24 selects a second communication channel corresponding to the highest channel gain h and is orthogonal to the first communication channel, and assigns the second communication channel to the second terminal as an allocation channel (S64).

The control module 24 determines whether or not the remaining terminal is the last terminal in the group (S65). If the terminal is not the last terminal, the control module 24 enters step S63, and the channel gain h of the remaining communication channels corresponding to the remaining terminals in the group is the highest. The process of selecting a communication channel corresponding to the gain h and allocating the corresponding communication channel to the corresponding terminal is sequentially performed. As a result of the determination in S65, when the remaining terminals are the last terminals in the group, the control module 24 allocates the last remaining communication channel to the last terminal as the allocation channel (S66).

As such, after step S60 of allocating a communication channel as an allocation channel to each terminal, the base station 20 controls the plurality of terminals to transmit a transmission signal through a communication channel corresponding to the allocation channel allocated to each terminal (S70). .

In addition, the base station 20 obtains a channel gain from a matrix model such as Equation (1) below to detect the transmission signal s transmitted by each of the plurality of terminals based on the reception signal r and the channel gain h. In the matrix H, the channel gain value excluding the channel gain h corresponding to the corresponding allocation channel of each terminal among the channel gains h between each communication channel and each terminal is set to “0”, and the present invention is set as described above. The transmission signal s of each of the plurality of terminals is detected through the matrix model of.

수식(1)

Formula (1)

은, 공유채널(FM)을 통해 단말기(UM)로부터 수신한 수신신호,

는, 공유채널(FM)을 통한 단말기(UM) 및 기지국의 안테나(AN)간의 채널이득,

는, 단말기(UM)가 송신하는 송신신호,

은, 공유채널(FM)을 통한 안테나(AN)로의 신호 수신 시 노이즈이다.Here, the matrix model of Equation (1) is a base station side reception signal r, which is a formula for detecting the transmission signal s of the terminal s = channel gain h x terminal side transmission signal s + noise It is based on (n). here,

Is a received signal received from the terminal UM through the shared channel FM,

The channel gain between the terminal (UM) and the antenna (AN) of the base station through the shared channel (FM),

Is a transmission signal transmitted by the terminal UM,

Is noise at the time of signal reception to the antenna AN via the shared channel FM.

Here, in the channel gain matrix H, setting the channel gain value other than the channel gain h corresponding to the corresponding allocation channel of each terminal among the channel gains h between each communication channel and each terminal to “0” When the control module 20 of the base station 20 controls each terminal U1 and U2 to transmit a signal, each terminal independently communicates with each terminal to transmit a signal through the assigned allocation channel. This is the result of assigning a channel.

Accordingly, since the base station 20 can detect the transmission signal s of each terminal based on the channel environment of 1 × 2 SIMO, the base station 20 is based on the channel environment of the conventional M × N MIMO. There is no need to adopt a detection scheme such as the VBLAST technique using odering.

Accordingly, in the channel allocation method for multi-user resource sharing according to the present invention, since the communication channel orthogonal to each terminal is allocated independently, the base station 20 detects a transmission signal from a reception signal received from each terminal. The receiver (not shown) structure of the base station 20 may also lead to a simplified effect.

Therefore, according to the channel allocation system for multi-user resource sharing and the channel allocation method for multi-user resource sharing according to the present invention, the terminal having the lowest signal quality among a plurality of terminals in a group that can use a plurality of communication channels has priority. By repeating a sequential process of selecting a communication channel having the largest channel gain (h) among the communication channels corresponding to the corresponding terminal and orthogonal to the communication channel previously allocated to the other terminal and allocating the terminal to the corresponding terminal, By assigning each allocation channel to a plurality of terminals and controlling each of the plurality of terminals to transmit a signal through each assigned allocation channel, positioning them in a cell boundary region without affecting the signal quality of a good terminal which is a signal quality Therefore, it is possible to improve the signal quality of the terminal that is of poor quality. Group may maximize channel diversity gain through multi-path, it is possible to prevent mutual interference as the orthogonal channel is assigned to each terminal.

In addition, according to the channel allocation system for multi-user resource sharing and the channel allocation method for multi-user resource sharing according to the present invention, since the base station 20 independently assigns orthogonal communication channels for each terminal, the base station 20 each terminal The receiver structure of the base station 20 may also lead to a simplified effect in detecting the transmission signal in the received signal received from the.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

Prior to the terminal having the lowest signal quality among the plurality of terminals in the group that can use several communication channels, the channel gain (h) is the largest among the communication channels corresponding to the terminal, and the communication channel previously assigned to the other terminal. Repeats the sequential process of selecting a communication channel orthogonal to the corresponding terminal, and assigning each allocation channel to a plurality of terminals in the group, and controlling each of the plurality of terminals to transmit a signal through each assigned allocation channel. Therefore, since the signal quality of the transmitted signal is reduced because the location of the cell boundary area is not affected without affecting the signal quality of the good terminal, which is the signal quality, each terminal has channel diversity through multiple paths. The gain can be maximized, and the orthogonal channel is allocated to each terminal to prevent mutual interference. In addition, according to the present invention, a channel allocation system for multi-user resource sharing and a channel allocation method for multi-user resource sharing according to the present invention, which can simplify a receiver structure of a base station in detecting a transmission signal from a received signal received from each terminal, are applied. This can lead to significant improvements in signal quality, base station installation, engineering and operation, and due to the potential for commercial or commercial application of the equipment to be applied, as well as practically viable. Invention.

1 is a block diagram illustrating a general base station and terminals.

2 is a schematic diagram illustrating a channel allocation system for multi-user resource sharing according to the present invention.

3A is a graph illustrating transmission signals transmitted by M terminals for transmission power and shared channels according to an embodiment of a channel allocation system for multi-user resource sharing according to the present invention.

3B is an exemplary channel environment for showing 1 × N SIMO corresponding to a terminal UM through an allocation channel M in a channel allocation system for sharing multi-user resources of the present invention.

FIG. 4A illustrates an example of a channel environment for showing 1 × 2 SIMO for each channel of each terminal U1 and U2 in a channel allocation system for multi-user resource sharing according to the present invention.

FIG. 4B is a graph showing transmission signals transmitted by two terminals U1 and U2 by transmission power and shared channels F1 and F2 according to an embodiment of a channel allocation system for sharing multi-user resources.

FIG. 4C shows transmission signals transmitted by two terminals U1 and U2 by transmission power and shared channels F1 and F2 according to another embodiment of FIG. 4B in the channel allocation system for multi-user resource sharing according to the present invention. It is a graph.

5 is a flowchart illustrating a control flow of a channel allocation method for multi-user resource sharing according to the present invention.

6 is a flowchart illustrating a specific control flow of allocating a channel in the channel allocation method for multi-user resource sharing according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 2: terminal group

U1, U2, U1 ', U2', U3 ', U4': Terminal

10: base station antenna

20: base station

21: Signal quality judgment module

22: group scheduler

24: control module

M: number of communication channels, number of terminals in the same group

F1, F2... FM: Each communication channel

S1, S2... SM: Transmission destination sent by each terminal

Claims (18)

Terminals allocated to each communication channel; And The signal quality of each of the terminals is determined based on the signals received from the terminals allocated to each communication channel, and includes a plurality of terminals according to preset signal quality criteria based on the determined signal quality of each of the terminals. At least one group is selected, and among the plurality of terminals, a communication channel having a large channel gain is selected from among the communication channels assigned to the plurality of terminals sequentially from a terminal having a low signal quality, and assigned to the corresponding terminal. And a base station for controlling each of the plurality of terminals in the group to transmit a signal through an assigned allocation channel. The method of claim 1, The base station comprises: According to the signal quality criteria, the difference between the signal quality level value of each terminal based on the level value of the signal quality determined corresponding to each of the terminals, the corresponding difference of the signal quality level value is greater than the preset difference value A channel allocation system for multi-user resource sharing, characterized in that the terminal is set as a group. The method of claim 2, The base station comprises: The first terminal having the lowest signal quality among the plurality of terminals is allocated the first communication channel having the highest channel gain among the respective communication channels allocated to the plurality of terminals included in the same group, and the lowest signal among the remaining terminals. Assigning a second communication channel having the highest channel gain among the remaining communication channels to a second terminal having quality,  And the first communication channel and the second communication channel are orthogonal channels orthogonal to each other. The method of claim 2, The base station comprises: The signal quality of each of the terminals is determined based on a Signal to Noise Ratio (SNR) or a Signal to Interference Plus Noise Ratio (SINR) of each of the terminals returned from the terminals by a downlink pilot signal. Channel allocation system for multi-user resource sharing. The method according to any one of claims 2 to 4, The base station comprises: At least one antenna and corresponding to each communication channel based on an M × N multiple input multiple output (MIMO) formed according to the number of terminals M and the number N of antennas; Channel allocation system for multi-user resource sharing, characterized in that to obtain the channel gain (h) of a plurality of terminals. The method of claim 5, The base station comprises: On the basis of the channel gains (h) of the plurality of terminals corresponding to the respective communication channels, the channel between each communication channel corresponding to the first terminal having the lowest signal quality compares the gain size (h) with the highest channel. Selecting a first communication channel corresponding to the gain (h) and assigning it to the allocation channel to the first terminal, the channel gain (h) between each other communication channel corresponding to the second terminal having the lowest signal quality among the remaining terminals And a second communication channel corresponding to the highest channel gain (h) by comparing sizes and assigning the second communication channel to the allocated channel to the second terminal. The method of claim 6, The base station comprises: In the equation for detecting the transmission signal (s) transmitted by the plurality of terminals based on the received signal (r) received from the plurality of terminals included in the same group and the channel gain (h) of the plurality of terminals, Among the channel gains (h) between each communication channel and each terminal of the channel gain matrix (H), the remaining channel gain value except for the channel gain (h) corresponding to the corresponding allocation channel of each terminal is set to "0". And a transmission signal (s) of the plurality of terminals.

Equation here,

Is a received signal received from the terminal UM through the shared channel FM,

The channel gain between the terminal (UM) and the antenna (AN) of the base station through the shared channel (FM),

Is a transmission signal transmitted by the terminal UM,

Is noise when receiving a signal from the antenna (AN) through the shared channel (FM). Determining, by the base station, signal quality of each of the terminals based on signals received from terminals assigned to each communication channel; Setting at least one group including a plurality of terminals according to a preset signal quality criterion based on a signal quality determination result; Selecting a communication channel having a large channel gain among the communication channels assigned to the plurality of terminals sequentially from a terminal having a low signal quality among the plurality of terminals and assigning the communication channel having a large channel gain to the corresponding terminal; And And controlling each of a plurality of terminals in the group to transmit a signal through each assigned allocation channel. The method of claim 8, Setting the group, According to the signal quality criteria, the difference between the signal quality level value of each terminal based on the level value of the signal quality determined corresponding to each of the terminals, the corresponding difference of the signal quality level value is greater than the preset difference value Channel allocation method for multi-user resource sharing, characterized in that the terminal is set to a group. The method of claim 9, The allocating step, Based on the signal quality determination result, a first communication channel having the highest channel gain among the respective communication channels assigned to the plurality of terminals included in the same group to the first terminal having the lowest signal quality among the plurality of terminals; Assigning them, Allocating a second communication channel having the highest channel gain among the remaining communication channels to a second terminal having the lowest signal quality among the remaining terminals,  And the first communication channel and the second communication channel are orthogonal channels that are orthogonal to each other. The method of claim 10, Determining the signal quality, Transmitting a downlink pilot signal to the terminals; Determining the signal quality of each of the terminals based on a Signal to Interference Plus Noise Ratio (SINR) or a Signal to Interference Plus Noise Ratio (SINR) of each terminal returned from the terminals. Channel allocation method for user resource sharing. The method according to any one of claims 9 to 11, The allocating step, Channel gain of the plurality of terminals corresponding to the respective communication channels based on the M × N multiple input multiple output (MIMO) formed according to the number of terminals M and the number N of antennas of the base station. (h) obtaining a channel allocation method for multi-user resource sharing. 13. The method of claim 12, The allocating step, Based on the channel gains (h) of the plurality of terminals corresponding to the respective communication channels, the maximum channel is compared by comparing the channel gains (h) between the communication channels corresponding to the first terminal having the lowest signal quality. Selecting a first communication channel corresponding to a gain h and allocating the first communication channel to the assigned channel; By comparing the channel gain (h) between the remaining communication channels corresponding to the second terminal having the lowest signal quality among the remaining terminals, and selecting the second communication channel corresponding to the highest channel gain (h) to the second terminal And allocating to an allocation channel. The method of claim 13, Detecting a transmission signal s transmitted by the plurality of terminals based on the received signal r received from the plurality of terminals included in the same group and the channel gain h of the plurality of terminals. Channel allocation method for multi-user resource sharing, characterized in that. The method of claim 14, Detecting the transmission signal s, In the equation for detecting the transmission signal (s) transmitted by the plurality of terminals, corresponding to the corresponding allocation channel of each terminal among the channel gains (h) between each communication channel of the channel gain matrix (H) and each terminal Setting the remaining channel gain value to “0” except for channel gain (h), Detecting a transmission signal (s) of the plurality of terminals based on a formula for detecting a transmission signal (s) transmitted by the plurality of terminals that are set. Assignment method.

Equation here,

Is a received signal received from the terminal UM through the shared channel FM,

The channel gain between the terminal (UM) and the antenna (AN) of the base station through the shared channel (FM),

Is a transmission signal transmitted by the terminal UM,

Is noise when receiving a signal from the antenna (AN) through the shared channel (FM). A plurality of terminals assigned to each communication channel; And The signal quality of the signal received from the plurality of terminals is determined, and among the plurality of terminals, a communication channel having a large channel gain is selected among the communication channels allocated to the plurality of terminals sequentially from a terminal having a low signal quality. And a base station for controlling each of the plurality of terminals to be assigned to the corresponding terminal and to transmit a signal through the assigned allocation channel. The method of claim 16, The base station comprises: Allocating a first communication channel having the highest channel gain among the respective communication channels allocated to the plurality of terminals to a first terminal having the lowest signal quality among the plurality of terminals, and a second having the lowest signal quality among the remaining terminals. And a second communication channel having the highest channel gain among the remaining communication channels, is allocated to the terminal. The method of claim 17, And the first communication channel and the second communication channel are orthogonal channels orthogonal to each other.

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