System and method of band subchannel control with adaptive modulation and coding (amc) in communication system of multiple access with orthogonal-frequency division

FIELD: information technologies.

SUBSTANCE: method for assignment of band channel with adaptive modulation and coding (AMC) to subscriber stations (SS) is realised in wireless communication system, which separates full range of frequencies into multiple subcarrier bands, every of which represents set from previously specified quantity of subranges, every of which represents set of previously specified quantity of adjacent subcarriers. Method comprises the following stages: necessity in use of band channel with AMC is detected; quality of reception is measured in frequency bands; list of frequency bands with high quality of reception is formed; request is sent for assignment of band channel with AMC as well as foresaid list to base station (BS); response is received to mentioned request from BS; in compliance with response, changeover is done in SS in condition of use of band channel with AMC.

EFFECT: creation of flexible system that provides possibility for subscriber stations with proper condition of channel to realise high-speed communication with high throughput.

61 cl, 7 dwg, 3 tbl

The technical field

The present invention relates, in General, to communication systems with multiple access orthogonal frequency division MDOC (OFDMA), and, in particular, to a system and method of controlling bandpass channel with AMC (adaptive modulation and coding (AMC)in the communication system using the scheme MLOCR-based full-duplex communication with time division, DDA (TDD) (hereinafter "the communication system MLOCR-DDA (TDD-OFDMA)").

Description of the prior art,

At present conducted research work on the creation of a communication system of the fourth generation (4G), which is a communication system of the next generation, providing subscribers with a variety of services with different quality of service, TO (QoSs), and supports a data transfer rate of approximately 100 Megabits per second (Mbps). Compared with the communication system of the fourth generation (4G)communication system of the third generation (3G) usually provides support for data transfer speeds of approximately 384 kilobits per second (kbps) using external communication channel with the worst conditions for the functioning of the channel and provides support for data transfer speeds up to 2 Mbit/s in the mode of internal communication channel with the best conditions for the functioning of the channel.

System wireless local area network, LAN (LN), and the system citywide wireless network, OS (MAN), generally support a data rate of 20-50 Megabits per second (Mbps). So now conduct active research in the field of communication systems fourth generation (4G) to develop a new communication system that provides mobility and quality of service in wireless LAN for system design, wireless city network, providing a higher data rate to support high-speed services in the 4G communication system.

Therefore, a large amount of research work carried out in the diagram pane MARCH (OFDM) for high-speed data transmission over wired/wireless channels in the 4G communication system. The term "scheme multiplexing orthogonal frequency division, MARCH (OFDM)" refers to a scheme for transmitting data using multiple carriers representing a variety of modulation schemes with several carriers, INN (MCM), which before sending performs parallel to serial conversion of the input character stream into parallel symbols and performs the parallel modulation symbols multiple orthogonal subcarriers, i.e. multiple subcarrier channels.

The multiple access scheme based on the scheme MARCH (OFDM), are the two who is a diagram MDOC (OFDMA). In the scheme MDOC (OFDMA) subcarriers in one symbol MDOC (OFDMA) are separated for many subscribers, that is, subscriber stations, AU (SSs). Communication systems that use the schema MARCH/MDOCS (OFDM/OFDMA)are, in particular, communication system, IEEE 802.16a, developed by the Institute of engineers in electronics and electrical engineering (IEEE), the communication system IEEE 802.16d and communication system IEEE 802.16e. Communication system IEEE 802.16d is a system in which the scheme MDOC (OFDMA) is used to support a broadband transmission over the physical channel for the system citywide wireless network. In addition, the communication system IEEE 802.16d is a communication system with broadband wireless access, shbd (BWA), which is based on a scheme MLOCR-DDA (TDD-OFDMA). Therefore, the communication system IEEE 802.16d, which scheme MARCH/MDOCS (OFDM/OFDMA) applied to the system citywide wireless network, transmits a signal on the physical channel using multiple subcarriers, thereby providing the possibility of high speed, high quality data.

Figure 1 shows a diagram, which schematically shows the structure of a frame used in a conventional communication system MLOCR-DDA (TDD-OFDMA). With reference to Figure 1, the frame used in the schema MLOCR-DDA (TDD-OFDMA), is divided into the interval 49 for a downward communication channel, NC (DL) and on the interval 153 for the upward communication channel, VC (UL). In the interval where the transition from NC to 149 VC 153 formed area 151 of the transition from transmission to reception, SPRD (TTG), which serves as a guard time interval, and the interval where the transition from the VC 153 back to NC 149, formed a zone of transition from reception to transmission, SPRM (RTG), which serves as a guard time interval. Frame MLOCR-DDA (TDD-OFDMA) has a vertical axis, containing a number of subchannels 147, and the horizontal axis, contains many characters 145 MDOC (OFDMA).

In the case of NC 149 k is the symbol MDOC (OFDMA) is a preamble 111 for synchronization, and information data broadcast, which the subscriber station (MSS) take together, for example the header 113 management frame, zook (FCH), map 115 field distribution of the descending channel (DL-MAP) and map 117 field distribution of the upward channel (UL-MAP), is a (K+1) or (K+2) symbols MDOC (OFDMA). Zook 113 contains two subchannel and communicates basic information about subchannels, that is, the schemes range and modulation. Packets 121, 123, 125, 127 and 129 NC are located between the (K+2) OFMDA symbol, except cards 119 field distribution of the upward channel (UL-MAP) and (K+8) symbol MDOC (OFDMA).

In the case of VC 153 in (K+9) symbol MDOC (OFDMA) are the preamble 131, 133 and 135, and the puck is s 137, 139 and 141 VK are located between the (K+10) character MDOC (OFDMA) and (K+12) symbol MDOC (OFDMA). In addition, between the (K+9) symbol MDOC (OFDMA) and (K+12) symbol MDOC (OFDMA) is the sub-channel 143 of the range.

Information about locations and on the distribution packages, 137, 139, and 141 VK and packages 121, 123, 125, 127 and 129 NC base station (BS), management of specific cell cellular (hundredth), a subscriber station (MSS), located in the cell of the cellular communication through maps 115 field distribution of the descending channel (DL-MAP) and map 117 field distribution of the upward channel (UL-MAP). Subscriber stations (MSS) are impermanent subchannels, each of which represents a combination of frequencies and symbols, through information in each frame, and the communication is performed using the selected subchannels. Thus, a subscriber station (MSS) can use different subchannels in each frame, and not permanent subchannels. In addition, in the neighboring cell subscriber stations (MSS) communicate using the same frequency range. Therefore, if different cell cellular use the same subchannels, then the MSS located in the cell boundary, the subchannels can create significant interference.

As described above, the conventional communication system MDOC (OFDMA) communicates with AB the subscriber stations (MSS), regardless of the channel state. That is, in the frame structure for a conventional communication system MDOC (OFDMA) there is no schema, providing the ability subscriber stations (MSS), having a good channel status, to realize high-speed communication with high bandwidth. Consequently, according to the conventional technology, it is impossible to realize how flexible modulation and coding for subscriber stations (MSS)with high quality subchannel.

The INVENTION

Therefore, the object of the present invention is to provide a system and method of performing high-speed communication with high bandwidth in the communication system with wireless broadband access.

Another objective of the present invention is to provide a method for distribution of band-pass channels with AMC to provide high speed data transmission in the subscriber station (MSS) with low mobility, communication MLOCR-DDA (TDD-OFDMA).

Another object of the present invention is to provide a system and method of controlling a band with AMC subchannels in a communication system MLOCR-DDA (TDD-OFDMA).

Another object of the present invention is to provide a control circuit BS and the MSS to enable high-speed data transmission with high bandwidth due to the transmission of status messages bandpass channel is AMC in the communication system MLOCR-DDA (TDD-OFDMA).

Another object of the present invention is to provide a control circuit BS and the MSS for the separation of bandpass channels with AMC in the communication system MLOCR-DDA (TDD-OFDMA).

Another object of the present invention is to provide a system and method of distribution strip with AMC subchannels based on the States of the channels of subscriber stations (MSS), in which the BS provides subscriber stations (MSS), having a good channel state, to produce high-speed data transfer with high bandwidth in the communication system MLOCR-DDA (TDD-OFDMA).

Another objective of the present invention is the creation of a new structure of the frame to enable high-speed data transmission with high bandwidth according to the channel state in a communication system MLOCR-DDA (TDD-OFDMA).

Another object of the present invention is to provide a system and method that provides the possibility of high-speed data transmission with high bandwidth through the use of highly efficient modulation and coding in the subscriber stations (MSS)with high quality channel through bandpass with AMC subchannels and their corresponding messages.

According to one of the objects of the present invention it is proposed a method of a subscriber station (MSS) requests the sa on the provision of a bandpass channel with adaptive modulation and coding (AMC) in a wireless communication system, which divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers. The method comprises the following operations: identify the need for the use of bandpass channel with AMK; measure the quality of reception in the frequency bands; form a list of frequency bands having a high reception quality, according to the measurement results of reception quality; transmit the request for provision of a bandpass channel with AMC in the base station (BS); receiving a response to the request from the BS and, in accordance with the answer, skip to the state in which the speaker uses a bandpass channel with AMK.

According to another object of the present invention it is proposed a method of providing a base station (BS) band-pass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers containing the following operations: receive a request from a bandpass channel with AMC from ZAR is it a given subscriber station (MSS), in a state in which the BS does not use the bandpass channel with AMK; in response to the request to determine whether to provide a bandpass channel with AMC this subscriber station (MSS); and transmit to the speaker of the bandpass channel with AMC in accordance with the definition.

According to another object of the present invention, a method of query subscriber station (MSS) request for provision of a bandpass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers. The method comprises the following operations: base station (BS) transmits a status message channel with AMK; BS accept response to the status message bandpass channel with AMC; and, in accordance with the response, determine whether to use a bandpass channel with AMK.

According to another object of the present invention it is proposed a method of providing a base station (BS) band-pass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into multiple floor is with subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers. The method comprises the following operations: receive information about bandpass channel with AMC from subscriber stations (MSS); and, in accordance with the accepted information about the channel, determine whether to provide a bandpass channel with AMK.

According to another object of the present invention it is proposed a method of transferring data over a channel established between a subscriber station (MSS) and base station (BS)in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers. The method comprises the following operations: find AC status current bandpass channel with adaptive modulation and coding (AMC)provided by the base station (BS); transmit to the BS a response message about the state of the channel, CH_STA_RSP (ATSOCAS)for change notification; accept message CH_STA_RSP (ATSOCAS); through messages CH_STA_RSP (ATSOCAS) BS determines whether the BS to provide AC bandpass Cana is with AMC; send the message with a pointer bandpass channel with AMK, BAND_AMC_IND (UKOOA)containing information indicating whether or not the BS subscriber station (MSS) band-pass channel with AMK; accept message BAND_AMC_IND (UKOOA); transfer from the MSS to the BS data using one of the channels: channel receive diversity and bandpass channel with AMC in accordance with the received message BAND_AMC_IND (UKOOA).

According to another object of the present invention proposed a system for providing a bandpass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers. The system includes a subscriber station (SS)transmits a response message about the state of the channel CH_STA_RSP (ATSOCAS) to request a bandpass channel with AMC to use a bandpass channel with AMK and to transmit information on the current bandpass channel with AMC; and a base station (BS)broadcasting message status request channel, CH_STA_REQ (SUPRASTIN), to determine the status of a bandpass channel with AMC used the AC in t is cushy time, receiving CH_STA_RSP (ATSOCAS), and transmitting to the system a message with a pointer bandpass channel with AMK, BAND_AMC_IND (UKOOA), in response to a received message CH_STA_RSP (ATSOCAS).

BRIEF DESCRIPTION of DRAWINGS

The above and other objectives, features and advantages of the present invention are explained in the following detailed description, illustrated by the drawings, which depict the following:

Figure 1 - chart that schematically illustrates a frame structure used in a conventional communication system MLOCR-DDA (TDD-OFDMA);

2 is a diagram, which schematically illustrates the structure of a frame used in the communication system MLOCR-DDA (TDD-OFDMA) according to one of embodiments of the present invention;

Figure 3 is a block diagram illustrating the operations performed by the AC at the request of the passband channel AMC in the communication system MLOCR-DDA (TDD-OFDMA) according to one of embodiments of the present invention;

4 is a block diagram illustrating the operations performed by the BS in response to the arrival of the AU request bandpass channel AMC in the communication system MLOCR-DDA (TDD-OFDMA) according to one of embodiments of the present invention;

5 is a block diagram illustrating the operations performed by the BS when receiving status messages bandpass ka is Ala with AMC of AC in the communication system MLOCR-DDA (TDD-OFDMA) according to one of embodiments of the present invention;

6 is a block diagram illustrating the operations performed by the AC when sending status messages bandpass channel AMC in the communication system MLOCR-DDA (TDD-OFDMA) according to one of embodiments of the present invention;

Fig.7. diagram of the exchange of the service signals illustrating the process of performing transmission/reception of messages associated with a bandpass channel with AMK exchanged between the MSS and the BS in the communication system MLOCR-DDA (TDD-OFDMA) according to one of embodiments of the present invention.

DETAILED DESCRIPTION the PREFERRED OPTION of carrying out the INVENTION

Below is a detailed description of the preferred embodiments of the present invention with reference to the drawings. In the description below, the detailed description contained therein of known functions and configurations are omitted for brevity.

Generally speaking, the present invention proposed system and method, which gives a base station (BS) to realize high-speed data transfer high-bandwidth subscriber stations (MSS), having a good channel state, in the communication system with orthogonal frequency multiplexing, MARCH (OFDM). In particular, in the present invention the proposed system and method provide a bandpass sub with AMK (adaptability the second modulation and coding) and management to enable high-speed data transfer high-bandwidth subscriber stations (MSS), having a good channel state, in accordance with the channel state subscriber stations (MSS).

That is, in the present invention the scheme of distribution of band-pass channels with AMC to provide higher data rate users, i.e. a subscriber station (MSS) with low mobility, the scheme of functioning of the BS and the MSS in accordance with the status report bandpass channel with AMC scheme and the functioning of the BS and the MSS for the separation of bandpass channels c AMK in the communication system MLOCR-DDA (TDD-OFDMA).

In particular, in the present invention the proposed system and method, in which the MSS measures the received signal level in each frequency band and selects a modulation scheme having a high coding efficiency in a specific frequency band having a high reception quality, based on the measured level of the received signal, whereby allows high-speed/high-speed receive data exchanged between the BS and the MSS in a communication system MLOCR-DDA (TDD-OFDMA).

In addition, in the present invention proposed a new structure frame MLOCR-DDA (TDD-OFDMA) to enable data transmission/reception in accordance with the channel state. In particular, the present invention is proposed bandpass channel with AMC and its corresponding novaezealandiae, and it utilizes a highly efficient modulation schemes and coding for subscriber stations (MSS)with high quality channel, whereby possible high-speed data transmission with high bandwidth.

Figure 2 shows a chart that schematically illustrates the structure of a frame used in the communication system MLOCR-DDA (MLOCR-DDA (TDD-OFDMA)) according to one of embodiments of the present invention. According to Figure 2, the frame structure for full bandwidth subcarrier is divided into many strips, such as Strip 1 - Strip No. 23, and the band contains many elements of the encoded signal (bins) or tile (tiles). Element of the encoded signal or the mosaic element contains the set of subcarriers. Here the element of the encoded signal contains 9 consecutive subcarriers in one symbol MARCH (OFDM), and has 1 pilot tone signal, and 8 tone data. Mosaic element contains from 3 to 6 consecutive subcarriers, and there are 2 pilot tone signal, and 16 tone data.

According to Figure 2, the first three characters MARCH (OFDM) frame used respectively for the channel range selection for channel acknowledgment (ACK) and channel quality information channel, KIC (CQI). Other characters MARCH (OFDM) widelands bandpass channels with AMK, for channels receive diversity and channel protection. Here bandpass channels with AMK, located in the front part of the frame is allocated on the basis of the strip containing 6 elements of the encoded signal, and the channels receive diversity, located in the rear part of the frame is allocated on the basis of the subchannel containing three mosaic element, distributed across the frequency band subcarrier.

Since bandpass channels with AMK more than channels receive diversity, from the point of view allocated for these areas, that is, when the reception quality is high, bandpass channels with AMC can be used to transmit/receive a large amount of data at high speed through the use of a modulation scheme having a high coding efficiency.

For channel protection, which represents the portion that is placed on all characters MARCH (OFDM), the selected one item of the encoded signal. For channel protection select all the characters in one element of the encoded signal. For speakers with a dedicated channel to the protection channel protection, not used in the cell to cell communication in the frequency range available for BS, that is in the unused frequency range.

Figure 3 shows a block diagram illustrating the operation of the request made by the AU, about the pre is the provision of a bandpass channel with AMC in the communication system MLOCR-DDA (MLOCR-DDA (TDD-OFDMA)) according to one of embodiments of the present invention. According Fig. 3, if a speaker is on stage 311 in the cancellation state of bandpass channel with AMC identifies the need for bandpass channel with AMC at step 313, it goes to step 315. At step 315 AC measures the quality of reception in all bands.

At step 317, the speaker compares the measured reception quality with reference to the value specified in the system and generates a list of bands that have higher values of the reception quality than the reference value, that is, frequency bands with high values of the reception quality. When the operation 319 the MSS transmits to the BS a response message about the state of the channel, CH_STA_RSP (ATSOCAS). Message CH_STA_RSP (ATSOCAS) contains a list of frequency bands having a high reception quality information about the KIC (CQI) of each band of frequencies contained in the list, and information about request bandpass channel with AMK. Description message format CH_STA_RSP (ATSOCAS) below.

After sending the message, CH_STA_RSP (ATSOCAS) speaker waits for a response from the BS in step 321. At step 323, when the AU receives from the BS a message with a pointer bandpass channel with AMK, BAND_AMC_IND (UKOOA), in response to message CH_STA_RSP (ATSOCAS), the MSS proceeds to step 325. Description message format BAND_AMC_IND (UKOOA) below.

At step 325, the speakers on the basis of the received message BAND_AMC_IND (UKOOA who) defines can the BS itself to provide AC bandpass channel with AMK. If the BS can provide AC bandpass channel with AMC, the MSS proceeds to step 327 in the state of the resolution bandpass channel with AMK. However, if the BS cannot provide the AC bandpass channel with AMC, the MSS returns to step 311 to repeat the above described sequence of operations.

Message CH_STA_RSP (ATSOCAS)transmitted at step 319 of the MSS in the BS uses the speaker to notify the BS about the quality of the channel in the frequency band, or to request the BS about providing a bandpass channel with AMK. The message format CH_STA_RSP (ATSOCAS) shown in the following Table 1.

As shown in Table 1, the message CH_STA_RSP (ATSOCAS) contains a lot of information elements IE (IE), namely "the type of the control message indicating the type of the transmitted message, and the type of the channel, which has received the message indicating the type of channel on which the AC reports to the BS, information on a channel list, information on the measured quality of each of which the AC reports to the BS, and information about the state of each channel contained in the list.

Information about the channel type is a channel used when the speaker communicates with the BS. For example, if your channel is the channel receive diversity, the type of channel on which the message arrived" represented by the value '00'. If your channel is a bandpass channel with AMC, the type of channel on which the message arrived" represented by the value '01'. If your channel is the security channel, the type of channel on which the message arrived" represented by the value '10'.

If the channel type is a channel receive diversity ("the type of channel on which the message arrived"=00), the message CH_STA_RSP (ATSOCAS) contains information about the ID downside is the anal connection for each channel of the receive diversity and the ratio of signal power on the carrier to interference (C/P) for the channel. If the type of channel is a bandpass channel with AMK ("the type of channel on which the message arrived"=01), the message CH_STA_RSP (ATSOCAS) contains information about each index bandwidth bandpass channel with AMC and the ratio of C/n for the band. If the channel type is a channel run ("type of channel on which the message arrived"=10), the message CH_STA_RSP (ATSOCAS) contains information about the ID of the element encoded signal channel protection, and the ratio of C/N for an element of the encoded signal.

Message BAND_AMC_IND (UKOOA)transmitted from the BS to the MSS in step 323 is a reply to message CH_STA_RSP (ATSOCAS), shown in Table 1, and is used by the BS to inform the speaker about providing/not providing her with a bandpass channel with AMK. The message format BAND_AMC_IND (UKOOA) shown in the following Table 2.

As shown in Table 2, the message BAND_AMC_IND (UKOOA) contains a lot of information elements, namely the type of the control message indicating the type of the transmitted message, and the index bandpass channel with AMK indicating acceptance/rejection of request for provision of a bandpass channel with AMK transmitted from the MSS to the BS. For example, if the value of the index bandpass channel with AMK is '1' (enabled)then the provision of a bandpass channel with AMC requested speakers confirmed. If the value of the index bandpass channel with AMK is '0' (forbidden), in providing a bandpass channel with AMC requested speaker refuses.

Figure 4 shows a block diagram illustrating operation of the BS in response to the arrival of the AU request bandpass channel AMC in the communication system MLOCR-DDA (MLOCR-DDA (TDD-OFDMA)) according to one of embodiments of the present invention. According to Figure 4, if the BS at step 411 in the cancellation state of bandpass channel with AMC takes the stage 413 of the speakers message CH_STA_RSP (ATSOCAS), then at step 415 the BS determines whether it can provide a bandpass channel with AMK, requested the AU, given the state of its resources.

If the BS can provide AC bandpass channel with AMK, then e is up 417 BS transmits to the system a message BAND_AMC_IND (UKOOA) with index bandpass channel with AMK, equal to 1 (enabled), shown in Table 2. After that, at step 421 BS enters a state of resolution bandpass channel with AMK.

However, if the BS cannot provide the AC bandpass channel with AMK, then at step 419 BS transmits to the system a message BAND_AMC_IND (UKOOA) with index bandpass channel with AMK, 0 (forbidden), shown in Table 2, and then returns to step 411, where it goes into the discard status of the bandpass channel with AMK.

Figure 5 shows a block diagram illustrating the operation request BS to receive status messages bandpass channel with AMK provided for the speakers in the communication system MLOCR-DDA (MLOCR-DDA (TDD-OFDMA)) according to one of embodiments of the present invention. According Fig. 5, if the BS at step 511 in the state of the permission bandpass channel with AMK detects at step 513 the occurrence of a particular effect, for example, if the BS detects the need to receive status messages bandpass channel with AMK provided for speakers, or if at step 517 BS receives from the speakers message CH_STA_RSP (ATSOCAS), the BS performs an operation according to the corresponding state.

At step 513 BS identifies a need for reception of status messages bandpass channel with AMK provided for speakers. At step 515 BS transmits a message status request channel CH_STA_REQ (SUPRASTIN request information status messages bandpass channel with AMK, provided for speakers, and then returns to step 511, where she remains in a state resolution bandpass channel with AMK. Description message format CH_STA_REQ (SUPRASTIN) below.

At step 513 BS identifies the need to receive status messages bandpass channel with AMC of AC, for example, in the following cases: (1) when it is determined that the reception quality of data transferred speakers with a bandpass channel with AMK is low, (2) when it is determined that the bandpass channel with AMC for each speaker you want to change the distribution is scheduled for the current time bandpass channels AMC, or (3) when the BS checks the current state of the bandpass channel with AMK used by each speaker, and wishes to perform an operation in accordance with this condition.

If the BS in the resolution state of the passband channel AMC on stage 511 receives at step 517 from the as message CH_STA_RSP (ATSOCAS) in response to the message CH_STA_REQ (SUPRASTIN)transmitted at step 515, the BS proceeds to step 519.

Figure 5 assumes that after the transfer to the system messages CH_STA_REQ (SUPRASTIN) BS receives the message CH_STA_RSP (ATSOCAS) in response to the message CH_STA_REQ (SUPRASTIN). However, the present invention is not limited to this assumption.

For example, the message CH_STA_RSP (ATSOCAS), adopted at step 517 may be transferred directly is edstone the speakers when the need is identified, a notification about the status of the bandpass channel with AMK even in the case when the BS at step 515 does not transmit to the MSS message CH_STA_REQ (SUPRASTIN) to issue request for status report bandpass channel with AMK. In this case, the BS receives the message CH_STA_RSP (ATSOCAS)transferred from the as, and performs the procedure according to the message CH_STA_RSP (ATSOCAS).

When the speaker wishes to determine whether she should be given another bandpass channel with AMC because of the low quality of its current bandpass channel with AMK, then at step 517, the MSS transmits a message CH_STA_RSP (ATSOCAS). As shown in Table 1, the message CH_STA_RSP (ATSOCAS), adopted at step 517, contains information about the quality of the bandpass channel with AMK provided for speakers.

After receiving status messages bandpass channel with AMK provided for the AU, through messages CH_STA_RSP (ATSOCAS), received from the MSS in step 517, at step 519 BS based on the received message CH_STA_RSP (ATSOCAS), determines whether a new bandpass channel with AMK.

If the BS cannot provide the AC bandpass channel with AMC, or if there is no need for AC bandpass channel with AMC base station (BS), then at step 521 BS transmits to the system a message BAND_AMC_IND (UKOOA) with index bandpass channel with AMK, 0. After that, at step 523 BS goes into the discard status of the bandpass channel with AMK.

However, if exists, is there a possibility to continue providing speakers bandpass channel with AMK, or if you do not want to provide AC bandpass channel with AMK, then at step 525 the base station (BS) transmits to the system a message BAND_AMC_IND (UKOOA) with index bandpass channel with AMK equal to 1, and then returns to step 511, where she remains in a state resolution bandpass channel with AMK.

Message CH_STA_REQ (SUPRASTIN)transmitted from the BS to the MSS at step 515, it is passed to a query, status messages bandpass channel with AMC, the selected speakers. The message format CH_STA_REQ (SUPRASTIN) shown in the following Table 3.

As shown in Table 3, the message CH_STA_REQ (SUPRASTIN) contain what it is a lot of information elements, namely, the type of the control message indicating the type of the transmitted message, and type the requested channel indicating information about the type of channel, a status message which the BS desires to receive from the speakers.

Information about the channel type is a channel used for communication BS of the MSS. For example, if your channel is the channel receive diversity, the type of the requested channel is represented by a value of '00'. If your channel is a bandpass channel with AMC, "the type of the requested channel is represented by a value of '01'. If used channel is the channel protection, type the requested channel is represented by the value '10'.

Figure 6 depicts a flowchart illustrating the operations performed by a subscriber station (MSS) when transmitting to the BS message about the state of her current band channel AMC in the communication system MLOCR-DDA (MLOCR-DDA (TDD-OFDMA)) according to one of embodiments of the present invention. According to Fig.6, if a speaker is on stage 611 in the state of the permission bandpass channel with AMK, detects the occurrence of a particular effect, for example, if a speaker is on stage 613 detects the need for transmission of status messages bandpass channel with AMK provided by the base station (BS), or if a speaker is on stage 625 receives from the BS a message CH_STA_REQ (SUPRASTIN), the AC power is it to step 615.

At step 613 the MSS identifies the need for transmission of status messages bandpass channel AMC in the following cases: (1) when it is determined that the speaker can no longer use bandpass channel with AMC because of the low quality of its current bandpass channel with AMC, or (2) when the speaker requests the BS about whether she should change the bandpass channel with AMC to another bandpass channel with AMK.

After that, at step 615, the MSS transmits to the BS a message CH_STA_RSP (ATSOCAS) about the state of her current bandpass channel with AMK.

Here it is assumed that the MSS determines whether to transmit status messages bandpass channel with AMK. However, the present invention is not limited to this assumption. For example, after taking the stage 625 from BS message CH_STA_REQ (SUPRASTIN) request status messages bandpass channel with AMC MSS at step 615 may transmit a message CH_STA_RSP (ATSOCAS) about the state of her current bandpass channel with AMK.

If after sending the message, CH_STA_RSP (ATSOCAS) in step 615 speakers that are in the wait state at step 617, receives from the BS a message BAND_AMC_IND (UKOOA) in step 619, at step 621, the MSS determines whether it can use a bandpass channel with AMK, by checking the set value index bandpass channel with AMK contained in a received message BAND_AMC_IND (UKOOA is).

For example, as shown in Table 2, if the value of the index bandpass channel with AMK is '1' (enabled)then this indicates that speakers can use a bandpass channel with AMK. If the value of the index bandpass channel with AMK is '0' (disabled), then it indicates that the speaker cannot use a bandpass channel with AMK.

If a speaker can no longer use bandpass channel with AMK, then at step 623 AC goes into the discard status of the bandpass channel with AMK. However, if the speakers can continue to use the bandpass channel with AMC, the MSS returns to step 611, where she remains in a state resolution bandpass channel with AMK.

Figure 7 shows a diagram of the exchange of the service signals, which illustrates the process of the establishment and disconnection of bandpass channel with AMK between the MSS and the BS in the communication system MLOCR-DDA (TDD-OFDMA) according to one of embodiments of the present invention. According to Fig.7, at step 711 AC BS 710 and 750 are sharing data with each other using channel diversity reception. If the MSS 710 wants to use a bandpass channel with AMK, then at step 713 AC 710 transmits to the BS 750 message CH_STA_RSP (ATSOCAS) request bandpass channel with AMK. After that, if at step 715 BS 750 determines that it can provide the MSS 710 bandpass channel with AMK, then at step 717 BS 750 informs the MSS 71 about the possibility of a bandpass channel with AMC through messages BAND_AMC_IND (UKOOA).

After receiving from the BS 750 messages BAND_AMC_IND (UKOOA) SA 710 performs transmission/reception of data in accordance with information contained in the message BAND_AMC_IND (UKOOA). Since, as described above, the message BAND_AMC_IND (UKOOA) contains information indicating the possibility of providing a subscriber station (MSS) 710 bandpass channel with AMK, then at step 719 AC 710 performs data exchange with the BS 750 channel receive diversity or presented bandpass channel with AMK.

For example, assuming that in the process of transmitting/receiving data at step 719 BS 750 performs data transmission of a downward communication channel to the MSS 710, if the amount of data is small, then the data transfer can be implemented using channel diversity reception, and when a large volume of data to be transmitted by the base station (BS) 750, the data transfer can be performed using the selected bandpass channel with AMK. In addition, when the MSS 710 transmits the data of the upward communication channel to the BS 750, the data transfer can be performed by using only the selected bandpass channel with AMK.

When the MSS 710 is in a state resolution bandpass channel with AMK, then at step 721 BS 750 may transmit to the MSS 710 message CH_STA_REQ (SUPRASTIN) to receive status messages allocated Polo is a new channel with AMK. At step 723 in response to message CH_STA_REQ (SUPRASTIN) SA 710 transmits to the BS 750 message CH_STA_RSP (ATSOCAS)containing information about the status of his current band channel AMC.

Alternatively, at step 725 the MSS 710 may periodically transmit to the BS 750 their own information relationship With/P, regardless of the request, the BS 750.

BS 750 transmits to the MSS 710 message BAND_AMC_IND (UKOOA) in accordance with the information contained in the message CH_STA_RSP (ATSOCAS)transmitted from the MSS 710. AC 710 receives the message BAND_AMC_IND (UKOOA) and 727 performs data exchange with the BS 750 channel receive diversity or bandpass channel with AMC in accordance with the information contained in a received message BAND_AMC_IND (UKOOA). At step 719 is determined which channel: channel receive diversity or bandpass channel with AMC should be used for communication between the MSS BS 710 and 750 at step 727.

If there is a change in the status of the current bandpass channel with AMK provided by the base station (BS) 750, then at step 729 AU 710 transmits a message CH_STA_RSP (ATSOCAS), notifying the BS 750 about the change. At step 731 BS 750 receives the sent message CH_STA_RSP (ATSOCAS) and on the basis of the received message CH_STA_RSP (ATSOCAS) determines whether it is necessary to provide AC 710 ka band is al with AMK. If at step 731 is determined that it is no longer necessary to use a subscriber station (MSS) 710 bandpass channel with AMK, then at step 733 BS 750 transmits a message BAND_AMC_IND (UKOOA)containing information indicating that the MSS 710 cannot use a bandpass channel with AMK, throwing in the MSS 710 command on the separation used a bandpass channel with AMK. Then at step 735 the MSS 710 performs data exchange with the BS 750 using only channel receive diversity.

When using schema providing a bandpass channel with AMK proposed in the present invention, the communication system MDOC (OFDMA) provides AC bandpass channel with high bandwidth in the if signal quality is high, and communicates information about the quality of the channel related to the given bandpass channel, to select a bandpass channel with high reception quality, by providing the possibility of high-speed/high-speed receive data from high-throughput exchanged between the BS and the MSS through the selected high-band channel using a modulation scheme with high efficiency encoding.

Although the present invention is shown and described with reference to specific predpochtitel the major variations in its implementation, for specialists in the art will understand that it can be made various changes in form and detail without changing the nature and scope of the invention defined by the attached claims.

1. Method of providing a subscriber station (MSS) band-pass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers containing the following:

identify the need to use a bandpass channel with AMK; measure the quality of reception in the frequency bands;

form a list of frequency bands having a high reception quality, according to the measurement results of reception quality;

transmit the request for provision of a bandpass channel with AMC and mentioned the list to the base station (BS);

receive a response to the above request from the BS and

in accordance with the answer, skip to the state in which the speaker uses a bandpass channel with AMK.

2. The method according to claim 1, in which the speaker compares the measured reception quality with reference to the value specified in the system which generates the list of frequency bands, in which the reception quality is higher than the reference value.

3. The method according to claim 1, additionally containing a transmission of a response message about the state of the channel (CH_STA_RSP) for transmission to the BS message about the quality of the current channel in response to a request from the BS or to transmit to the BS request bandpass channel with AMK.

4. The method according to claim 3, in which the message CH_STA_RSP contains a list of channels with high quality of reception quality information channel (CQI) for the channels included in the list and the information request bandpass channel with AMK.

5. The method according to claim 3, in which the message CH_STA_RSP contains the type of the channel, which has received a message containing information about the type of channel state information which should be communicated to the subscriber station (MSS) in the BS, information on a channel list, information on the measured quality of each of which the AC reports to the BS, and information about the state of each channel contained in the list.

6. The method according to claim 5, in which the type of the channel, which has received the message contains information about the channel used for communication SA BS;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

7. The method according to claim 3, in which the message CH_STA_RSP contains information about the ID is notificator channel (ID) and the ratio of the power signal on the carrier to interference (C/P), at least one of channel diversity reception bandpass channel with AMC and channel protection.

8. Method of providing a bandpass channel with adaptive modulation and coding (AMC) base station (BS) subscriber station (MSS) in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers containing the following:

accept a request from a bandpass channel with AMK from a predetermined subscriber station (MSS)in a state in which the BS does not use the bandpass channel with AMK;

in response to the request to determine whether to provide a bandpass channel with AMC this subscriber station (MSS); and

transmit to the speaker of the bandpass channel with AMC in accordance with the definition.

9. The method of claim 8, further containing operations:

pass the message indications to indicate the possibility of providing a bandpass channel with AMC, if the BS has determined that it should provide subscriber stations bandpass channel with AMC, and

provide AC bandpass channel with AMC after the transfer with the bscene instructions.

10. The method according to claim 8, in which the request is received from the MSS, is the response message about the state of the channel (CH_STA_RSP)transmitted to the subscriber station for directions to the BS message about the quality of the channel in response to a request from the BS or to transmit to the BS request bandpass channel with AMK.

11. The method according to claim 10, in which the message CH_STA_RSP contains a list of channels with high quality of reception quality information channel (CQI) for the channels included in the list and the information request bandpass channel with AMK.

12. The method according to claim 10, in which the message CH_STA_RSP contains

type of the channel, which has received the message that displays information about the type of channel state information which should be communicated to the subscriber station in the BS, information on a channel list, information on the measured quality of each of which the AC reports to the BS, and information about the state of each channel contained in the list.

13. The method according to item 12, in which the type of the channel, which has received the message contains information about the channel used for communication SA BS;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

14. The method according to claim 10, in which the message CH_STA_RSP contains information about the ID is the anal (ID) and the ratio of the power signal on the carrier to interference (C/P) for each channel receive diversity, bandpass channel with AMC and channel protection.

15. The method according to claim 8, in which the BS, in response to a request from the MSS, and transmits a message with a pointer bandpass channel with AMK (BAND_AMC_IND)that indicates whether the BS to provide subscriber stations bandpass channel with AMK.

16. The method of use of the subscriber station (MSS) band-pass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers containing the following:

transmit to the base station (BS), a status message channel AMC used AC;

receiving from the BS a response message about the state of the bandpass channel with AMC

and

in accordance with the response to determine whether to continue to use bandpass channel with AMK.

17. The method according to clause 16, in which in a state where the speaker uses a bandpass channel with AMC, the MSS transmits information about the quality of its current bandpass channel with AMC after identifying the need for transmitting status messages of the current bandpass channel with AMC or after receiving from the BS request status messages of the current Polozov the second channel with AMK.

18. The method according to 17, in which the BS shall transmit the request for obtaining the status messages bandpass channel with AMC, provided the subscriber station, via request messages about the state of the channel (CH_STA_REQ).

19. The method according to p in which the message is CH_STA_REQ contains the type of the requested channel, displaying information about the type of channel for which the BS desires to receive a status message channel from the speakers.

20. The method according to claim 19, in which information about the channel type contains information about the channel used in communication with BS AU;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

21. The method according to clause 16, in which the step of determining includes the following operations:

accept the response from the BS, transferred through a message with a pointer bandpass channel with AMK (BAND_AMC_IND);

check the set value of the index bandpass channel with AMK contained in the message BAND_AMC_IND; and

if the pointer bandpass channel with AMK contains information indicating the possibility of using a bandpass channel with AMC, it determines that it should continue to use the bandpass channel with AMK.

22. The method according to clause 16, in which in response to a request from the BS, the MSS transmits to the BS a response message about the state of the channel (CH_STA_RSP) for PE is Adachi messages about the quality of the current channel.

23. The method according to item 22, in which the message CH_STA_RSP contains a list of channels with high quality of reception quality information channel (CQI) for the channels included in the list and the information request bandpass channel with AMK.

24. The method according to item 22, in which the message CH_STA_RSP contains the type of channel on which the message arrived"representing the type information of the channel state information which should be communicated to the subscriber station in the BS, information on a channel list, information on the measured quality of each of which the AC reports to the BS, and information about the state of each channel contained in the list.

25. The method according to paragraph 24, in which the type of the channel, which has received the message contains information about the channel used for communication SA BS;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

26. The method according to item 22, in which the message CH_STA_RSP contains information about the channel identifier (ID) and the ratio of the power signal on the carrier to interference (C/P) for each channel diversity reception bandpass channel with AMC and channel protection.

27. The method according to clause 16, in which the response received from the BS, the message with a pointer bandpass channel with AMK (BAND_AMC_IND).

28. The method according to item 27, to which the PR message BAND_AMC_IND contains information field, indicates that the request of the AU on the provision of a bandpass channel with AMC approved or rejected.

29. The way to provide a base station (BS) band-pass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into multiple bands of subcarriers, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers containing the following:

receiving from a subscriber station (MSS) information bandpass channel with AMC, used speakers, and

in accordance with the accepted information about the channel to determine whether to continue to provide a bandpass channel with AMK.

30. The method according to clause 29, which additionally contains the following operations: transmit to the MSS message instructions containing information corresponding to the result of determination; and

provide subscriber stations bandpass channel with AMC according to the definition.

31. The method according to item 30, in which information about bandpass channel with AMC transferred from the AU, contains the return status message channel (CH_STA_RSP), which is a message about the quality of the current channel, transmitted in response to a request from the BS.

32. The method according to p in which the message is CH_STA_RSP contains p is a list of channels with high reception quality, information about the quality of the channel (CQI) for the channels included in the list and the information request bandpass channel with AMK.

33. The method according to p in which the message is CH_STA_RSP contains the type of channel on which the message arrived"representing the type information of the channel state information which should be communicated to the subscriber station in the BS, information on a channel list, information on the measured quality of each of which the AC reports to the BS, and information about the state of each channel contained in the list.

34. The method according to p in which type of channel on which the message arrived" provides information about the channel used for communication SA BS;

this channel, which has received the message includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

35. The method according to p in which the message is _STA_RSP contains information about the channel identifier (ID) and the ratio of the power signal on the carrier to interference (C/P), at least one channel receive diversity, a bandpass channel with AMC and channel protection.

36. The method according to p in which the message is CH_STA_RSP is a message transmitted subscriber station for transmission in the BS request bandpass channel with AMK.

So on clause 29, optionally containing transfer to the AU request status messages bandpass channel with AMK, when revealed the need to identify the status of a bandpass channel with AMK.

38. The method according to clause 37, in which the query message about the state of the channel is passed to the AU through the message status request channel (CH_STA_REQ).

39. The method according to § 38, in which the message CH_STA_REQ contains the type of the requested channel, displaying information about the channel type, a status message which the BS desires to receive from the speakers.

40. The method according to § 39, in which information about the channel type contains information about the channel used in communication with BS AU;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

41. The method according to clause 29, in which the BS transmits information on the availability of the channel by a message with a pointer bandpass channel with AMK (BAND__IND).

42. The method according to paragraph 41, in which the message BAND_AMC_IND contains information field indicating approval or disapproval of the request bandpass channel with AMK.

43. The transmission channel established between a subscriber station (MSS) and base station (CS), in the wireless communication system that divides a full frequency band into multiple bands of subcarriers kadais which is a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers containing the following:

find the subscriber station status current bandpass channel with adaptive modulation and coding (AMC)provided by the base station;

transmit a subscriber station to the base station a response message about the state of the channel (CH_STA_RSP) for change notification;

take the base station a message CH_STA_RSP;

determine the base station through messages CH_STA_RSP whether the base station and further to provide for subscriber stations bandpass channel with AMK;

transmit the base station a message with a pointer bandpass channel with AMK (BAND_AMC_IND)containing information indicating whether or not the base station subscriber station bandpass channel with AMK;

accept subscriber station message BAND_AMC_IND;

transmit a subscriber station to the base station data using channel diversity reception or bandpass channel with AMC in accordance with the received message BAND_AMC_IND.

44. The method according to item 43, additionally containing the following: if it is determined that the system is no longer required to use a bandpass channel with AMC, the BS transmits to the system a message BAND_AMC_IND containing inform the tion, indicates the inability to use a bandpass channel with AMC, and separates used bandpass channel with AMC; and

after receiving the message BAND_AMC_IND, the MSS transmits data to the BS using a channel receive diversity.

45. The method according to item 43, additionally comprising, in response to the request message about the state of the channel (CH_STA_REQ) to query the status messages of the current channel, the transmission of the subscriber station message CH_STA_RSP.

46. The method according to item 45, in which the message CH_STA_REQ contains the type of the requested channel"containing information about the type of channel, a status message which the BS desires to receive from the speakers.

47. The method according to item 46, in which information about the channel type contains information about the channel used in communication with BS AU;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

48. The method according to item 43, in which data in a top-down communication channel from the BS to the MSS, the BS transmits data using channel diversity reception when the amount of data does not exceed a predetermined threshold value, and transmits the data using a bandpass channel with AMC, if the amount of data exceeds a predetermined threshold value.

49. The method according to item 43, in which data on the rising Cana is the connection from the MSS to the BS, the MSS transmits data using a bandpass channel with AMK.

50. The method according to item 43, in which the message CH_STA_RSP contains the type of the channel, which has received a message containing information about the type of channel state information which should be communicated to the subscriber station in the BS, information on a channel list, information on the measured quality of each of which the AC reports to the BS, and information about the state of each channel contained in the list.

51. The method according to item 50, in which the type of the channel, which has received the message contains information about the channel used for communication SA BS;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

52. The method according to item 43, in which the message CH_STA_RSP contains information about the channel identifier (ID) and the ratio of the power signal on the carrier to interference (C/P) for at least one of channel diversity reception bandpass channel with AMC and channel protection.

53. The method according to item 43, in which the message BAND_AMC_IND contains information field indicating that the request of the AU on the provision of a bandpass channel with AMC approved or not approved.

54. The system for using a bandpass channel with adaptive modulation and coding (AMC) in a wireless communication system that divides a full frequency band into many bands put the seashore, each of which represents a set of a predetermined number of sub-bands, each of which represents a set of a predetermined number of adjacent subcarriers containing:

subscriber station (MSS) for transmitting a response message about the state of the channel (CH_STA_RSP) to request a bandpass channel with AMC to use a bandpass channel with AMK and to transmit information on the current bandpass channel with AMC; and

base station (BS) for transmitting a request message about the state of the channel (CH_STA_REQ) for detecting the state of a bandpass channel with AMK used by the subscriber station at the current time, receive messages CH_STA_RSP and transmitting to the system a message with a pointer bandpass channel with AMK (BAND_AMC_IND) in response to a received message CH_STA_RSP.

55. The system according to item 54, in which if it is determined that the system is no longer required to use the current bandpass channel with AMC, the BS transmits to the system a message BAND_AMC_IND containing information indicating the inability to use a bandpass channel with AMC, and separates used in the subscriber station bandpass channel with AMK;

after receiving the message BAND_AMC_IND the MSS transmits data to the BS using a channel receive diversity.

56. The system according to item 54, in which if it is determined that the system is no longer required to use the th current bandpass channel with AMK, the BS transmits to the system a message BAND_AMC_IND containing information indicating the inability to use a bandpass channel with AMC, and separates used in the subscriber station bandpass channel with AMK;

after receiving the message BAND_AMC_IND AC receives data from the BS using a channel receive diversity.

57. The system according to item 54, in which the message CH_STA_REQ contains the type of the requested channel"containing information about the type of channel, a status message which the BS desires to receive from the speakers.

58. System § 57, in which the information about the channel type contains information about the channel used in communication with BS AU;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

59. The system according to item 54, in which the communication between the MSS and the BS is performed with the use of bandpass channel with AMC or channel receive diversity in accordance with the information contained in the message BAND_AMC_IND.

60. System p in which data in a top-down communication channel from the BS to the MSS, the BS transmits data using channel diversity reception when the amount of data does not exceed a predetermined threshold value, and transmits the data using a bandpass channel with AMC, if the amount of data exceeds ZAR is it specified threshold.

61. System p in which to transmit data upstream communication channel of the MSS in the BS, the MSS transmits data using a bandpass channel with AMK.

62. The system according to item 54, in which the message CH_STA_RSP contains the type of channel on which the message arrived"representing the type information of the channel state information which should be communicated to the subscriber station in the BS, information on a channel list, information on the measured quality of each of which the AC reports to the BS, and information about the state of each channel contained in the list.

63. The system according to item 62, in which the type of the channel, which has received the message contains information about the channel used for communication SA BS;

this channel includes at least one of the channel diversity reception bandpass channel with AMC and channel protection.

64. The system according to item 54, in which the message CH_STA_RSP contains information about the channel identifier (ID) and the ratio of the power signal on the carrier to interference (C/P) for at least one of channel diversity reception bandpass channel with AMC and channel protection.

65. The system according to item 54, in which the message BAND_AMC_IND contains information field indicating that the request of the AU on the provision of a bandpass channel with AMC approved or rejected.