JP5387711B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a radio communication system, for example, a technique suitable for use in a system defined in IEEE 802.16.

As represented by systems such as WCDMA and CDMA2000, wireless communication systems that perform communication via wireless communication paths are now widely used worldwide. In such a radio communication system, a radio base station (BS; Base Station) is installed in a service area, and a radio terminal communicates with another communication device (communication terminal) via the radio base station. .
FIG. 18 shows a connection form of P-MP (Point to Multipoint) type in which the wireless base station 101 is connected to a plurality of wireless terminals (MSs) 102 in its cover area (cell) 100. The IEEE (The Institute of Electrical and Electronics Engineers, Inc.) 802.16, which is a standard for high-speed wireless data communication, defines a P-MP form as shown in FIG. 18 as a form of communication. The 802.16WG prescribes two types, an 802.16d specification (802.16-2004) mainly for fixed communication use and an 802.16e specification (802.16e-2005) for mobile communication use. doing.

In the P-MP type connection form as shown in FIG. 18, the service area is limited within the cell 100 of the radio base station 101, and high-speed communication is possible because the radio environment is not good at the boundary (cell edge) of the cell 100. Often difficult.
In order to solve this problem, IEEE 802.16WG has established a task group 802.16j that examines a relay station (RS) that relays between a radio base station and a radio terminal. I am in the middle.

In addition, the matter regarding the above-mentioned IEEE802.16 is disclosed by the following nonpatent literatures 1 to 3, for example.
Also, in Patent Document 1 below, in a relay system via a relay station, a radio base station determines scheduling in communication between the relay station and the radio terminal, and the relay station transmits the relay station and the radio terminal from the radio base station. Disclosed is a technique for receiving scheduling information between nodes and executing communication control between a relay station and a wireless terminal based on the scheduling information. At this time, since the radio base station performs scheduling processing intensively, a simple implementation is sufficient for the relay station.

  In the technique described in Patent Document 1, when all scheduling in communication between a relay station and a wireless terminal is performed by a wireless base station, the relay station does not change the contents of signals and data received from the wireless terminal. Therefore, it is necessary to relay to the radio base station. This is because the radio base station needs information on the radio terminal received by the relay station in order for the radio base station to perform scheduling between the relay station and the radio terminal in place of the relay station.

JP 2006-74325 A

IEEE Std 802.16-2004 IEEE Std 802.16e-2005 2006 IEICE General Conference B-5-140 “Effects of Multiple MAP (Map) in IEEE 802.16 Relay System”

According to the background art described above, a wireless terminal can perform wireless communication with a wireless base station directly or via a relay station.
However, since the radio base station performs scheduling between the relay station and the radio terminal on behalf of the relay station, information on the radio terminal received by the relay station is required by the radio base station. Consumption increases.

Therefore, one of the objects of the present invention is to effectively use radio communication resources.
Note that the present invention is not limited to the above-mentioned object, and is an effect derived from each configuration shown in the best mode for carrying out the invention described later, and an effect that cannot be obtained by the conventional technique is also another aspect of the present invention. It can be positioned as one of the purposes.

  (1) For example, a wireless communication system including a wireless terminal, a wireless base station that wirelessly communicates with the wireless terminal, and a relay station that relays between the wireless terminal and the wireless base station, the relay station comprising: , Based on the information received by the radio channel state receiving unit, the radio channel state receiving unit for receiving information on the radio channel state between the relay station and the radio terminal from the radio terminal, A determination unit that determines whether it is necessary to change a wireless communication method used between the wireless base station and the wireless terminal via a relay station; and the determination unit determines that the wireless communication method needs to be changed And a notification unit for notifying at least one of information related to a radio channel state between the relay station and the radio terminal and related information to the radio base station as related information only when In addition, the radio base station changes a radio communication method used between the radio base station and the radio terminal via the relay station based on the related information notified from the notification unit. A wireless communication system comprising: a scheduling information generating unit that generates scheduling information in communication in which the wireless communication method has been changed; and a transmitting unit that transmits the scheduling information generated by the scheduling information generating unit to the relay station. The system can be used.

  According to the present invention, it is possible to effectively use radio communication resources.

It is a figure which shows the structural example of the radio | wireless communications system with which each embodiment of this invention is applied. It is a figure which shows an example of the radio | wireless frame format to which this embodiment is applied. It is a figure which shows the signal sequence in 1st Embodiment of this invention. It is a figure which shows the signal sequence as a contrast with respect to the signal sequence of 1st Embodiment. It is a block diagram which shows the relay station in 1st Embodiment. It is a figure which shows the information memorize | stored in the memory | storage part of the relay station in 1st Embodiment. It is a figure which shows the structural example of the control message produced | generated in the notification part of the relay station in 1st Embodiment. It is a block diagram which shows the wireless base station in 1st Embodiment. It is a figure which shows the signal sequence in 2nd Embodiment of this invention. It is a block diagram which shows the relay station in 2nd Embodiment. It is a figure which shows the information memorize | stored in the memory | storage part of the relay station in 2nd Embodiment. It is a figure which shows the structural example of the control message produced | generated in the notification part of the relay station in 2nd Embodiment. It is a block diagram which shows the wireless base station in 2nd Embodiment. It is a figure which shows the signal sequence in 2nd Embodiment of this invention. It is a block diagram which shows the relay station in 3rd Embodiment. It is a figure which shows the information memorize | stored in the memory | storage part of the relay station in 3rd Embodiment. It is a figure which shows the structural example of the control message produced | generated in the notification part of the relay station in 3rd Embodiment. It is a figure which shows a radio | wireless communications system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[A] Description of Configuration Example of Radio Communication System to Which Each Embodiment of the Present Invention is Applied FIG. 1 is a diagram illustrating a configuration example of a radio communication system to which each embodiment of the present invention is applied. A radio communication system 1 shown in FIG. 1 includes a radio base station (BS) 2, a relay station (relay station; RS) 3, and a plurality (two in this case) of radio terminals (MS # 1, MS # 2). 4-1 and 4-2. In the following description, the wireless terminals 4-1 and 4-2 are simply referred to as wireless terminals 4 when they are not distinguished.

  The radio terminal 4-1 existing in the cover area 2a of the radio base station 2 exchanges (communications) radio signals with the radio base station 2 (BS-MS link), and also covers the radio base station 2 in the cover area 2a. The external radio terminal 4-2 can perform radio communication with the radio base station 2 via the relay station 3 (BS-RS link and RS-MS link). As the wireless terminal 4, any of a so-called MS suitable for movement and a wireless device suitable for fixed use can be used.

  In FIG. 2, as an example of a radio frame format to which the present embodiment is applied, a radio frame format for radio communication between the radio base station 2, the relay station 3, and the radio terminals 4-1 and 4-2 is described. Show. Here, a radio frame format corresponding to IEEE Std 802.16d, e is taken as an example, but the present invention is not limited to this.

  In FIG. 2, Tx and Rx mean transmission and reception, respectively. Therefore, BS2 transmits DL / UL MAP (map), MMR bursts # 1 and # 2, and downlink burst T4-1 in order with preamble (P) as the head of the frame. The MMR burst # 1 is transmission data from the radio base station 2 to a relay station (not shown) in FIG. 1, and the MMR burst # 2 is transmission data to the relay station 3 shown in FIG. The downlink burst 4-1 is transmission data to the wireless terminal 4-1 in FIG.

  The preamble (P) is a synchronization signal transmitted in the area of the radio base station 2 to enable the radio terminals 4-1, 4-2 and the relay station 3 to synchronize with the radio base station 2. The known pattern is transmitted at a constant cycle. In FIG. 2, when the UP Link Sub-frame ends, transmission of the Down Link Sub-frame starts again from the preamble.

The wireless terminal 4 stores a plurality of types of preamble patterns in advance, and can select the pattern having the best reception quality (for example, reception level) as the communication destination wireless base station 2.
For example, when OFDMA (Orthogonal Frequency Division Multiplexing Access) is used as a radio system, the radio base station 2 allocates transmission data to each subcarrier and performs transmission using a plurality of subcarriers. Can be allocated to each subcarrier and transmitted. The wireless terminal 4 receives the predetermined combination of subcarriers, matches it with a known preamble signal, and can synchronize with the wireless base station 2 that transmits the best preamble.

  Following the transmission of the Down Link Sub-frame preamble is DL / UL MAP (map), and transmission / reception timing, transmission / reception with respect to the relay station 3 and the wireless terminal 4-1. This is an area for storing control data (MAP (map) data) for controlling transmission / reception operations such as channels and wireless communication systems (modulation system, encoding system, encoding rate, etc.). The MAP (map) data includes DL MAP (map) data and UL MAP (map) data. The DL MAP (map) data defines the structure of the downlink subframe, and the UL MAP (map) data is the uplink subframe. Define the frame structure.

  The DL MAP (map) data includes transmission timing and transmission channel (reception) for the area of MMR # 2 (including MAP (map) data, transmission data, etc. addressed to the radio terminal 4-2) that is transmission data to the relay station 3. Data for notifying the reception timing, reception channel) and wireless communication method for the transmission side, and the transmission timing and transmission channel (reception for the reception side) for the area of T4-1 that is transmission data for the wireless terminal 4-1. Timing, reception channel), and data for notifying the wireless communication method. In FIG. 1, the control data in the MMR # 1 area in FIG. 2, which is transmission data for a relay station (not shown), is also included.

  On the other hand, UL MAP (map) data is an area (reception timing, reception channel (transmission timing for the transmission side) for receiving RNG (Ranging signal) or CQI (Channel Quality Indicator) from the wireless terminal 4-1. MAP (map) data for notifying a transmission channel), a wireless communication system, and the like, and an area for receiving MMR # 2 (MMR # 1 from a relay station (not shown)) from the relay station 3 (reception timing, reception channel ( MAP (map) data for notifying the transmission timing, transmission channel), wireless communication method, and the like for the transmission side.

  Here, the Ranging (ranging) signal is a known signal, received at the radio base station 2 (or at the radio base station 2 via the relay station 3), in addition to reception timing deviation (phase deviation) and reception frequency deviation, The result of obtaining the necessary transmission power increase / decrease information is reported to the radio base station 2 as Adjustment information. In this example, the RNG from the radio terminal 4-1 is directly received in the RNG reception period of the radio base station 2, the RNG from the radio terminal 4-2 is received in the RNG reception period of the relay station 3, and the uplink It is transmitted to the radio base station 2 through MMR # 2.

  The CQI reports the result of the wireless terminal 4 measuring the reception quality such as CINR (Career to Interference and Noise Ratio) for a known signal such as a preamble or a pilot signal (known signal included in downlink burst data). Indicates the transmission period. For example, the radio base station 2 changes transmission parameters such as a modulation scheme, a coding scheme, and a coding rate based on CQI information received from the radio terminal 4-1 under its control.

That is, when the reception quality is good, control is performed to increase the transmission rate, while when reception quality is degraded, control is performed to decrease the transmission rate.
By the way, the relay station 3 uses a preamble or DL / UL to provide services to the wireless terminal 4-2 outside the area formed by the wireless base station 2 like the wireless terminal 4-2 shown in FIG. MAP (map) is transmitted. That is, since the radio terminal 4-2 cannot receive the preamble transmitted from the radio base station 2, it can synchronize with the radio frame transmitted by the relay station 3 by receiving the preamble transmitted from the relay station 3. It is doing so. Note that the preamble transmitted by the relay station 3 may be different from the preamble transmitted by the radio base station 2 or may be the same.

The DL / UL MAP (map) transmitted by the relay station 3 defines an area (transmission / reception timing, channel) for performing wireless communication with the wireless terminal 4-2 under the relay station 3 and a wireless communication system. It may be different from the content of the DL / UL MAP (map) transmitted from the radio base station 2 due to the data transmitted by the downlink MMR # 2.
Therefore, the radio terminal 4-2 receives the preamble (P) transmitted from the relay station 3 to establish synchronization, and transmits the downlink burst T4-2 included in the DL MAP (map) received based on the preamble. Since the area and the wireless communication system are detected, T4-2 is received by the area and the wireless communication system. Similarly, RNG, CQI, T4-2 transmission areas and wireless communication systems included in the received UL MAP (map) are acquired and various data are transmitted.

The relay station 3 receives RNG, CQI, T4-2 according to the notified UL MAP (map) data, and transmits these data to the radio base station 2 through the uplink MMR # 2.
As described above, by introducing the relay station 3, the wireless communication of the wireless terminal 4-2 can be supported. However, in the wireless base station 2, communication with the wireless terminal 4-1 and the relay station 3 is supported. In order to generate a DL / UL MAP (map) for the radio terminal 4-2 as well as a DL / UL MAP (map) for the radio base station, information on the radio terminal 4-2 received by the relay station 3 is used as a radio base station. 2 received.

In the present embodiment, the amount of information transmitted on the uplink / downlink MMR # 2 between the relay station 3 and the radio base station 2 can be suppressed.
[B] Description of First Embodiment / Outline of Signal Sequence in First Embodiment FIG. 3 shows a BW Request Code (request code) transmitted from the radio base station 2 and its response signal in the first embodiment of the present invention. FIG. 4 is a diagram showing a signal sequence as a comparison with the signal sequence of the first embodiment. 3 and 4, it is assumed that the relay stations 3 and 3 ′ are connected to the three wireless terminals 4-21 to 4-23, respectively.

  Note that the BW Request Code (request code) is transmitted from the wireless terminal 4 (relay station 3 ′ of FIG. 4) in the uplink RNG area of FIG. 2, for example, when data is transmitted from the wireless terminal 4 to the network. (Or via the relay station 3 in FIG. 3) is the code to be sent to the radio base station 2 first. The wireless terminal selects and transmits one of a plurality of types of codes. The CDMA Allocation (allocation) IE, which is a response to this BW Request Code (request code), is information defined in the UL MAP (map) and transmits the BW Request Code (request code). This is to notify the wireless terminal 4 of the frame area (transmission / reception timing) and communication method for transmitting the BW Request from the wireless terminal 4. The wireless terminal 4 that has received this CDMA Allocation (allocation) IE uses a bandwidth request for transmitting data to the network in the frame area (transmission timing) and communication method specified by the CDMA Allocation (allocation) IE. A certain BW Request can be transmitted to the radio base station 2.

  Here, as in the relay station 3 ′ shown in FIG. 4, in order to perform bandwidth allocation corresponding to the BW Request Code (request code) in the wireless base station 2 through the UL MAP (map), a plurality of wireless terminals 4 are used. When receiving BW Request Codes (request codes) # 1 to # 3 from -21 to 4-23, information (for example, code type) of each BW Request Code (request code) is received each time it is received. It is assumed that it is necessary to relay to the radio base station 2 together with the information of each reception timing (frame number, frame position).

  That is, the radio base station 2 shown in FIG. 4 receives information related to these BW Request Codes (request codes) each time, and responds to the BW Request Code (request code) (CDMA Allocation (allocation) IE ( Information Element); in the figure, scheduling information (DL / UL MAP (map)) including CDMA Alloc IE) can be generated.

  On the other hand, according to the relay station 3 according to the first embodiment shown in FIG. 3, BW Request Codes (request codes) # 1 to # 3 are received from the respective radio terminals 4-21 to 4-23. In this case, in order to generate the scheduling information in the radio base station 2, each BW Request Code (request code) # 1 to # 3 including reception timing information (that is, transmission timing information from the radio terminal 4) is included. 4 is transmitted to the radio base station 2 as a single BW Request Message (request message) without transmitting all the information.

  Specifically, when the relay station 3 receives BW Request Codes (request codes) # 1 to # 3 from a plurality of connected wireless terminals 4-21 to 4-23, each relay station 3 receives each BW Request Code ( Request code) # 1 to # 3 and information on the reception position of BW Request Code (request code) in the radio frame (information obtained by receiving a signal from the radio terminal) are stored. Then, the relay station 3 uses the received BW Request Code (request code) as an aggregated information of the BW Request Code (request code), for example, instead of the received BW Request Code (request code) pattern itself. ) Is transmitted to the radio base station 2 as a BW Request Message (request message). Note that transmission to the radio base station 2 is omitted for the reception timing information of BW Request Codes (request codes) # 1 to # 3 stored in its own relay station 3.

  The radio base station 2 secures a corresponding CDMA Allocation (allocation) IE area from the number of BW Request Codes (request codes) received from the relay station 3, and generates a UL MAP (map). . That is, the radio base station 2 individually performs BW Request in CDMA Allocation (allocation) IEx3 which is a response to the radio terminals 4-21 to 4-23 that transmitted the BW Request Codes (request codes) # 1 to # 3. Response R1 (CDMA Allocation (allocation) IE in UL MAP (map) IE) that secures the area for the allocation without specifically writing the information of the received frame position of Code (request code) Output. Usually, in CDMA Allocation (allocation) IE, the value of BW Request Code (request code) or when wireless terminals 4-21 to 4-23 transmit BW Request Code (request codes) # 1 to # 3. Although the position of the radio frame is described, since the radio base station 2 in the first embodiment does not grasp the information, the description of the information in the area is omitted.

  That is, the position of the radio frame when radio terminals 4-21 to 4-23 transmit BW Request Codes (# 1 to # 3) to be written in CDMA Allocation (allocation) IE is described above. As shown in FIG. Therefore, the relay station 3 writes these contents in the CDMA Allocation (allocation) IE area in the UL MAP (map) from the radio base station 2 and individually assigns the BW Request frame position. In addition, as the priority of assignment, the order of arrival of codes, importance, etc. can be determined as a scale.

  The relay station 3 transmits CDMA Allocation (allocation) IE # 1 to # 3 as responses to which the frame position of the BW Request is assigned in this way in the UL MAP (map) (see R2). Each of the wireless terminals 4-21 to 4-23 determines the response CDMA Allocation (allocation) IE corresponding to the BW Request Code (request code) # 1 to # 3 sent from the content of the received UL MAP (map). By reading the contents of # 1 to # 3, it is possible to obtain the frame position and the wireless communication method designated for transmitting the subsequent BW Request.

As a result, the transmission amount of information related to the BW Request Code (request code) from the relay station 3 to the radio base station 2 is reduced, and the uplink radio communication resource MMR # 2 is efficiently used. Will be able to.
-Configuration of relay station in the first embodiment When the relay station 3 in the first embodiment pays attention to the function for improving the efficiency of the radio communication resource as described above, the relay station 3 receives a signal like the relay station 3A shown in FIG. A unit 301, a code reception unit 302, a storage unit 303, an aggregation unit 304, a notification unit 305, a transmission unit 306, a UL MAP (map) extraction unit 307, and a relay unit 308 are provided.

  Here, the reception unit 301 receives a radio signal forming a signal or a message from the radio terminal 4-2 (see FIG. 1, 4-21 to 4-23 in FIG. 3) and the radio base station 2. Further, the Code receiving unit 302 extracts a code such as a BW Request Code (request code) (band request signal) from the above-described wireless terminal 4-2 from the signal or message received by the receiving unit 301, for example. To do. Specifically, symbol (symbol) and subchannel (subchannel) information is detected as information on the frame number and code value when the code is received and the position of the radio frame when the code is received.

  Therefore, the above-described receiving unit 301 and code receiving unit 302 receive signals and messages from the plurality of radio terminals 4-21 to 4-23, and store the received signal and message information in the storage unit 303. The side signal receiving unit is configured. Also, a base station side signal receiving unit that receives scheduling information in the communication between the radio base station 2 and each of the plurality of radio terminals 4 via the relay station 3A from the radio base station 2 by the receiving unit 301 described above. Configure.

  The storage unit 303 stores signal and message information from the plurality of wireless terminals 4-21 to 4-23. Specifically, the type and position information of the band request signal is stored as communication control information as information of the band request signal received by the Code receiving unit 302. For example, as shown in FIG. 6, the code number extracted and detected by the Code receiving unit 302, the frame number, and the symbol and sub-channel information, which are information on the position of the radio frame when the code is received, are stored. Further, the storage unit 303 generates communication control information (in this case, DL / UL MAP (map) which is scheduling information) for communication control with the plurality of wireless terminals 4-21 to 4-23. Information).

  The aggregating unit 304 aggregates signal and message information from the plurality of wireless terminals 4-21 to 4-23. Specifically, when the Code receiving unit 302 receives the BW Request Code (request code) from the wireless terminal 4-2 as described above, the number of the BW Request Code (request code) received in the frame is set. Counting is performed, and information on the number of counted BW Request Codes is sent to the notification unit 305 to be transmitted to the radio base station 2 as a control message.

  As a result, the notification unit 305 generates a control message based on the number of BW Request Codes (request codes) from the aggregation unit 304, and the transmission unit 306 generates the control message using the notification unit 305. The control message is wirelessly transmitted to the wireless base station 2. It is assumed that the band for transmitting the control message is allocated from the radio base station 2 when the relay station 3A receives the BW Request Code (request code) from the radio terminal 4-2.

  A configuration example of a control message generated by the notification unit 305 is shown in FIG. In the control message, as shown in FIG. 7, the ID information (RS ID) of the relay station 3A serving as identification information of the transmission source, the information (Message Type) of the type (type) of this control message, the relay station 3A A frame number (Frame Number) when a BW Request Code (request code) is received and a count value (No. BW Request Code) of the number of BW Request Codes (request codes) at that time can be included.

Therefore, base station side signal transmission in which the information aggregated by the aggregation unit 304 is transmitted to the radio base station 2 by the above-described notification unit 305 and transmission unit 306 in order to generate DL / UL MAP (map) that is scheduling information. Parts.
Also, the UL MAP (map) extraction unit 307 extracts the UL MAP (map) from the signals from the radio base station 2 received by the reception unit 301.

  CDMA Allocation (allocation) IE, which is a response to BW Request Code (request code), is included in this UL MAP (map). The relay unit 308 relays the UL MAP (map) extracted by the UL MAP (map) extraction unit 307. In particular, information on CDMA Allocation (allocation) IE is stored in the storage unit 303. And then relaying to the wireless terminal 4-2 through the transmission unit 306.

  As described above, the position information, the frame number, the code value, and the like of the radio frame when the radio terminals 4-21 to 4-23 transmit BW Request Codes # 1 to # 3 are as follows. While the information is stored in the storage unit 303 of the relay station 3A and the information stored in the storage unit 303 by the aggregation process in the aggregation unit 304, the contents to be transmitted to the radio base station 2 (the control message of FIG. (Content) is omitted. Therefore, the CDMA Allocation (allocation) IE included in the UL MAP (map) from the radio base station 2 does not include these pieces of information.

  In the relay unit 308, these contents (information on the position of the radio frame) stored in the storage unit 303 in the CDMA Allocation (allocation) IE area in the UL MAP (map) extracted by the UL MAP (map) extraction unit 307 And the frame position of the BW Request to be transmitted from the wireless terminal 4-2 can be individually assigned. The CDMA Allocation (allocation) IE supplemented in this way can be transmitted to the wireless terminal 4 through the transmission unit 306. In addition, as the priority of assignment, the order of arrival of codes, importance, etc. can be determined as a scale.

  Therefore, the above-described relay unit 308 constitutes a complementing unit that supplements the content of the scheduling information (from the radio base station 2) received by the receiving unit 301 in accordance with the communication control information stored in the storage unit 303. . That is, the relay unit 308 as a complementing unit supplements the type and position information of the band request signal stored in the storage unit 303 with respect to the scheduling information received by the receiving unit 301.

The transmission unit 306 configures a terminal-side signal transmission unit that transmits the scheduling information whose contents are complemented by the relay unit 308 to the plurality of wireless terminals 4-21 to 4-23.
-Configuration of the radio base station 2 in the first embodiment For the radio base station 2 in the first embodiment, focusing on the function for improving the efficiency of radio communication resources as described above, the radio base station shown in FIG. Like the station 2A, a receiving unit 201, a control message extracting unit 202, a scheduling unit 203, an NW interface unit 204, a buffer unit 205, and a transmitting unit 206 are provided.

  Here, the reception unit 201 receives a radio signal forming a signal or a message from the relay station 3A or the radio terminal 4-1 (see FIG. 1), and forms a base station side signal transmission unit in the relay station 3A. Information from the transmission unit 306 is received. The control message extraction unit 202 extracts control message information from signals or messages received by the reception unit 201. For example, the control message extraction unit 202 extracts the content of a control message for notifying the number of BW Request Codes (request codes) as shown in FIG. 7 in the relay station 3A.

  The scheduling unit 203 generates a DL / UL MAP (map) that is scheduling information from the contents described in the control message extracted by the control message extraction unit 202. For example, when the control message extraction unit 202 extracts a control message for notifying the number of BW Request Codes (request codes) as shown in FIG. 7, the scheduling unit 203 uses the BW Request Code (request Generate a CDMA Allocation (allocation) IE for the area of several minutes of code) and add it to the UL MAP (map). At this time, the generated CDMA Allocation IE does not include specific information that makes a response to the BW Request Code.

  Therefore, the scheduling unit 203 described above excludes the DL / UL MAP (map), which is scheduling information, based on the information received by the receiving unit 201, except for the information to be supplemented by the relay unit 308 of the relay station 3A. A scheduling information generation unit that generates In other words, the scheduling unit 203 generates scheduling information based on the information received by the receiving unit 201 by performing band allocation for the number of bandwidth request signals aggregated in the information received by the receiving unit 201. It has become.

  The NW interface unit 204 performs interface processing to send data from the wireless terminal 4 received by the receiving unit 201 to, for example, another network, and performs interface processing on signals addressed to the wireless terminal 4 from other networks. It is. The buffer 25 buffers the data from the NW interface unit 204 and the DL / UL MAP (map) generated by the scheduling unit 203 so that the data is transmitted from the transmission unit 206 at a predetermined timing.

The transmission unit 206 transmits the signal or message from the buffer 25 to the relay station 3A or the wireless terminal 4-1. For example, the scheduling information generated by the scheduling unit 203 is transmitted to the relay station 3A.
In the first embodiment, since the relay unit 3A and the radio base station 2A are configured as described above, for example, as shown in the signal sequence of FIG. BW Request Code (request code) # 1 to # 3 information is transmitted to the radio base station 2 as an aggregated control message, and the content of the CDMA Allocation IE from the radio base station 2 is supplemented. It is possible to transmit to the wireless terminal 4-2.

  Specifically, the receiving unit 301 and the Code receiving unit 302 of the relay station 3A receive and receive BW Request Code (request code) as signals and messages from the plurality of wireless terminals 4-21 to 4-23. The communication control for communication control between the wireless terminals 4-21 to 4-23 and the relay station 3A is performed using the code number, the frame position, and the frame number information, which are the information of the BW Request Code (request code). The information is stored in the storage unit 303 as information. Further, the aggregating unit 304 aggregates the information of the BW Request Code (request code) from the wireless terminals 4-21 to 4-23, and the notifying unit 305 and the transmitting unit 306 It is transmitted to the station 2 ("BW Request Message (request message)" in FIG. 3, see FIG. 7).

  In the radio base station 2, the reception unit 201 and the control message extraction unit 202 receive the above-described aggregated information from the relay station 3 </ b> A, and the scheduling unit 203 determines the radio base station based on the received aggregated information. Generate scheduling information (CDMA Allocation (allocation) IE of UL MAP (map) IE) for communication between the base station 2 and each of the wireless terminals 4-21 to 4-23 via the relay station 3A, The buffer unit 205 and the transmission unit 206 transmit the scheduling information generated as described above to the relay station 3A (see R1 in FIG. 3). At this time, the CDMA Allocation (allocation) IE forming the generated scheduling information does not include specific information that makes a response to the BW Request Code (request code) (that is, left blank).

  The receiving unit 301 and the UL MAP (map) extracting unit 307 of the relay station 3A receive the scheduling information transmitted by the radio base station 2, and the relay unit 308 stores the received scheduling information in the storage unit 303. The contents are supplemented according to the communication control information being received (that is, specific information that makes a response to the BW Request Code (request code) is included). Then, the transmitting unit 306 transmits the scheduling information whose contents are complemented to the wireless terminals 4-21 to 4-23 (see R2 in FIG. 3).

  In each of the wireless terminals 4-21 to 4-23, a response to the BW Request Code (request code) transmitted by itself from the frame position information of the CDMA Allocation (allocation) IE in the received UL MAP (map). CDMA Allocation (allocation) IE is extracted. As a result, each of the wireless terminals 4-21 to 4-23 can thereafter transmit a BW Request in the area specified in the Up Link Sub-frame in the UL MAP (map).

As described above, according to the first embodiment of the present invention, the relay station 3 can supplement the UL MAP (map) information corresponding to the wireless terminals 4-21 to 4-23. There is an advantage that it can be used.
In the first embodiment described above, a case has been described in which a plurality of wireless terminals 4-21 to 4-23 are accommodated in the relay station 3A. However, according to the present invention, the present invention is not limited to this. Similarly, when wireless terminals are accommodated, the wireless communication resources can be effectively used.

[B] Description of Second Embodiment of the Invention In the first embodiment, when the relay station 3 is introduced, a BW Request Code (request code) is transmitted from the wireless terminal 4-2 as a band request signal, Although the case where CDMA Allocation (allocation) IE in UL MAP (map) is transmitted as a response from the radio base station 2 has been described, in the second embodiment, a Ranging Code (ranging code) is transmitted from the radio terminal 4-2. A case will be described in which RNG-RSP in the DL MAP (map) is transmitted as a response from the radio base station 2.

The Ranging Code is transmitted to the radio base station 2 shown in FIG. 1 by the radio terminal 4-1, so that the transmission power, transmission timing, and transmission frequency of the radio terminal 4-1 are determined. This is for receiving an instruction (RNG-RSP) for control from the radio base station 2.
When the relay station 3 is introduced as in the present embodiment, the radio terminal 4-2 that is outside the cover area of the radio base station 2 and is in the cover area of the relay station 3 establishes a radio connection with the relay station 3. Ranging code (ranging code) is transmitted at the start stage, and transmission power control or the like is received through a response (RNG-RSP) from the relay station 3. At this time, in order for the relay station 3 to transmit the RNG-RSP to the radio terminal 4-2, it is necessary to receive band allocation through the DL MAP (map) from the radio base station 2. Therefore, the relay station 3 needs to transmit information related to the Ranging Code from the wireless terminal 4-2 to the wireless base station 2.

  Here, when the repeater 3 is introduced, when the relay station 3 receives the ranging codes # 1 to # 3 from the plurality of radio terminals 4-21 to 4-23, the radio base station 2 In order to perform bandwidth allocation corresponding to the Ranging Code (ranging code) through the DL MAP (map), each reception code (ranging code) information is received for each reception timing (frame number, frame position). It is assumed that it is necessary to relay to the radio base station 2 together with the information of).

On the other hand, in the second embodiment, as shown below, information related to a Ranging Code (ranging code) transmitted from the relay station 3 to the radio base station 2 is aggregated, and the RNG-RSP in the relay station 3 By generating the bandwidth, the bandwidth is effectively used.
FIG. 9 shows a signal sequence of a ranging code (ranging code) transmitted from the wireless terminals 4-21 to 4-23 and a response signal thereof in the second embodiment of the present invention. FIG. When receiving the Ranging Code (ranging code) # 1 to # 3 from each of the radio terminals 4-21 to 4-23, the radio base station 2 receives the received code to generate the DL MAP (map). A single RS Ranging Message (ranging message) is transmitted without transmitting all the information of each Ranging Code (ranging code) # 1 to # 3 including timing information (that is, transmission timing information from the wireless terminal 4). As in the case of FIG. 3 of the first embodiment, information aggregated over all information related to the ranging code is transmitted to the radio base station 2.

  Specifically, when relay station 3 receives Ranging Codes (ranging codes) # 1 to # 3 from a plurality of connected radio terminals 4-21 to 4-23, each relay code (ranging code) Code) # 1 to # 3 and information on the receiving position of the ranging code (ranging code) in the radio frame, and adjustment information (radio terminal 4-21) such as power, timing, and other frequencies to the radio terminals 4-21 to 4-23 (Control information for adjusting transmission power, phase and other frequencies from ˜4-23).

  Then, the relay station 3 receives the Ranging Code (ranging code) information as an aggregated information, not the pattern of each received Ranging Code (ranging code) itself, for example, following the case of the first embodiment. Information on the number of Ranging Codes is transmitted to the radio base station 2 as an RS Ranging Message. As described above, transmission to the radio base station 2 is omitted with respect to information for adjusting the reception timing, power, etc. of the ranging codes (ranging codes) # 1 to # 3 stored in the relay station 3 as described above. .

  In the radio base station 2, an RNG-RSP area corresponding to the number of Ranging Codes received from the relay station 3 is secured in the data area in the frame, and DL MAP (map) Is generated. That is, the radio base station 2 sends the RNG-RSP in the DL MAP (map) as a response R3 to the radio terminals 4-21 to 4-23 that transmitted the Ranging codes (ranging codes) # 1 to # 3. Specifies the area for. Note that, since the radio base station 2 has not received control information such as transmission power and transmission timing from the relay station 3, individual control information is not written to the designated region RNG-RSP.

  That is, transmission power control information, phase control information, or frequency control information for the radio terminals 4-21 to 4-23 to be written in the RNG-RSP is stored in the relay station 3 as described above. Therefore, the relay station 3 writes these contents in the RNG-RSP area specified by the DL MAP (map), and individually designates the radio terminals 4-21 to 4-23 as RNG-RSP # 1 to # 3. It notifies transmission power control information, transmission timing (phase) control information, and the like.

As a result, it is possible to reduce the transmission amount of information related to the ranging code (ranging code) from the relay station 3 to the radio base station 2 in particular, and to efficiently use the MMR # 2, which is an uplink radio communication resource. become able to.
-Configuration of relay station in the second embodiment When the relay station 3 in the second embodiment pays attention to the function for improving the efficiency of the radio communication resource as described above, the relay station 3 receives a signal like the relay station 3B shown in FIG. A unit 311, a code reception unit 312, a storage unit 313, an aggregation unit 314, a notification unit 315, a transmission unit 316, a DL MAP (map) extraction unit 317, and a relay unit 318 are provided.

  Here, the reception unit 311 receives a radio signal forming a signal or a message from the radio terminal 4-2 (see FIG. 1, 4-21 to 4-23 in FIG. 9) and the radio base station 2. Further, the code receiving unit 312 extracts a code such as a ranging code from the wireless terminal 4-2 described above, from the signal or message received by the receiving unit 311.

  Specifically, the code receiving unit 312 receives information on symbols and subchannels as the frame number and code value when the code is received, and the position information of the radio frame when the code is received. To detect. In particular, when the receiving unit 311 receives a ranging code from the wireless terminals 4-21 to 4-23, the reception power and the reception timing are measured from the received signal of the ranging code (ranging code). The power / timing adjustment information for the wireless terminal 4-2 generated based on the measurement result is stored in the storage unit 313.

  Accordingly, the above-described receiving unit 311 and code receiving unit 312 receive signals and messages from the plurality of radio terminals 4-21 to 4-23, and store the received signal and message information in the storage unit 313. The side signal receiving unit is configured. In particular, the Code receiving unit 312 receives a Ranging Code that is a power / timing adjustment signal from the plurality of wireless terminals 4-21 to 4-23, and the received Ranging Code (ranging code). To generate power / timing adjustment information for the corresponding wireless terminals 4-21 to 4-23, together with the generated power / timing adjustment information, the type (code type) and position as a ranging code (ranging code) Information is stored in the storage unit 313 as communication control information.

Also, scheduling information (DL / UL MAP (map)) in communication between the radio base station 2 and each of the radio terminals 4-21 to 4-23 via the relay station 3B is received by the receiving unit 311 described above. ) From the radio base station 2 is configured.
Furthermore, the storage unit 313 generates communication control information (in this case, DL / UL MAP (map) that is scheduling information) for communication control with the plurality of wireless terminals 4-21 to 4-23. Information). Specifically, as shown in FIG. 11, as information related to the Ranging Code received by the Code receiving unit 312, the code number (Code), frame number (Frame) extracted and detected by the Code receiving unit 312. Number), the symbol (Symbol) and subchannel (Subchannel) information, which is information on the position of the radio frame when the code is received, and the timing adjustment information (Timing) and power as power / timing adjustment information The adjustment information (Power) is stored.

  The aggregating unit 314 aggregates the power / timing adjustment signals from the plurality of radio terminals 4-21 to 4-23 to be transmitted to the radio base station 2. Specifically, when the code receiving unit 312 receives a ranging code that is a power / timing adjustment signal from the wireless terminals 4-21 to 4-23 as described above, the code is received within the frame. The number of Ranging Codes (ranging codes) is counted, and information on the counted number of Ranging Codes (ranging codes) is passed to the notification unit 315 to be transmitted to the radio base station 2 as a control message.

  Accordingly, the notification unit 315 generates a control message based on the information on the number of Ranging Codes (ranging codes) from the aggregation unit 314, and the transmission unit 316 generates the control message. The control message is wirelessly transmitted to the wireless base station 2. It is assumed that the band for transmitting the control message is allocated from the radio base station 2 when the relay station 3B receives the Ranging Code from the radio terminal 4-2.

  A configuration example of a control message generated by the notification unit 315 is shown in FIG. In the control message, as shown in FIG. 10, the ID information (RS ID) of the relay station 3B serving as transmission source identification information, the information (Message Type) of the type (type) of this control message, and the relay station 3B It is possible to include a frame number (Frame Number) when a Ranging Code (ranging code) is received and a count value (No. Ranging Code) of the number of the Ranging Code (ranging code) at that time.

Therefore, the base station side signal transmission in which the information aggregated by the aggregation unit 314 is transmitted to the radio base station 2 to generate the DL / UL MAP (map) that is the scheduling information by the notification unit 315 and the transmission unit 316 described above. Parts.
Further, the DL MAP (map) extraction unit 317 extracts a DL MAP (map) from the signals from the radio base station 2 received by the reception unit 311.

  The power / timing adjustment information for the Ranging Code is written in the RNG-RSP area designated by the DL MAP (map). The relay unit 318 relays the DL MAP (map) extracted by the DL MAP (map) extraction unit 317, and in particular, information on the position of the radio frame (symbol and symbol) derived from the wireless terminal that transmitted the code. For (subchannel), the DL MAP (map) is complemented with the content stored in the storage unit 313. Further, the relay unit 318 writes the power / timing adjustment information to the corresponding radio terminals 4-21 to 4-23 in the RNG-RSP area specified by the DL MAP (map). The signal in which the contents of the DL MAP (map) and the RNG-RSP are thus written is transmitted to the wireless terminals 4-21 to 4-23 through the transmission unit 316.

As described above, the position information, the frame number, the code value, and the like of the radio frame when the radio terminals 4-21 to 4-23 transmit Ranging Codes # 1 to # 3 are relay stations. While stored in the storage unit 313 of 3A, it is omitted from the contents sent to the radio base station 2 (the contents of the control message in FIG. 12).
In the relay unit 318, the contents of the DL MAP (map) extracted by the DL MAP (map) extraction unit 317 are stored in the storage unit 313 (the information on the position of the radio frame, the frame number, and the code value). Etc.) and the power / timing adjustment information for the wireless terminals 4-21 to 4-23 is written in the RNG-RSP area specified by the above-mentioned DL MAP (map). .

  Therefore, the above-described relay unit 318 configures a complementing unit that supplements the content of the scheduling information (from the radio base station 2) received by the receiving unit 311 according to the communication control information stored in the storage unit 313. . That is, the relay unit 318 as a complement unit supplements the type and position information of the power / timing adjustment signal stored in the storage unit 313 for the DL MAP (map) that is the scheduling information received by the reception unit 311. To do.

In addition, the transmission unit 316 serving as a terminal-side signal transmission unit transmits the DL MAP (map) that is the scheduling information supplemented by the relay unit 318 and is generated by the Code reception unit 312 through the RNG-RSP region. The power / timing adjustment information is transmitted to a plurality of wireless terminals 4-21 to 4-23.
As a result, each of the wireless terminals 4-21 to 4-23 extracts power / timing adjustment information for each transmitted Ranging Code from the RNG-RSP area while referring to the DL MAP (map). Thus, a signal can be transmitted with transmission power and timing according to the extracted adjustment information.
-Configuration of the radio base station 2 in the second embodiment For the radio base station 2 in the second embodiment, focusing on the function for improving the efficiency of radio communication resources as described above, the radio base station shown in FIG. Like the station 2B, the receiving unit 211, the control message extracting unit 212, the scheduling unit 213, the NW interface unit 214, the buffer unit 215, and the transmitting unit 216 are provided.

  Here, the receiving unit 211 receives a radio signal forming a signal or a message from the relay station 3A or the radio terminal 4-1 (see FIG. 1), and forms a base station side signal transmitting unit in the relay station 3B. Information from the transmission unit 316 is received. The control message extraction unit 212 extracts control message information from signals or messages received by the reception unit 211. For example, the control message extraction unit 212 extracts the contents of the control message for notifying the number of Ranging Codes as shown in FIG. 12 in the relay station 3B.

  The scheduling unit 213 generates a DL / UL MAP (map) that is scheduling information from the contents described in the control message extracted by the control message extraction unit 212. For example, when the control message extracting unit 212 extracts a control message for notifying the number of Ranging Codes (ranging codes) as shown in FIG. 12, the scheduling unit 213 receives the Ranging Code (ranging code). ) RNG-RSP corresponding to several minutes is secured by DL MAP (map). At this time, in the DL MAP (map), the position information of the radio frame, the frame number, the code value, and the like are not described, and the RNG-RSP has a response to the Ranging Code (ranging code). No specific power / timing adjustment information is included.

  Therefore, the above-described scheduling unit 213 uses the DL MAP (map), which is scheduling information, based on the message notifying the number of Ranging Codes received by the reception unit 211 to the relay station 3B. This is a scheduling information generation unit that is generated by excluding information to be supplemented by the relay unit 318. In other words, in the scheduling unit 213, based on the information received by the receiving unit 211, a DL MAP (map) that is scheduling information is integrated into the information received by the receiving unit 211. A number of bandwidths are allocated for generation.

  The NW interface unit 214 performs interface processing to send data from the wireless terminal 4 received by the receiving unit 211 to, for example, another network, and performs interface processing on signals addressed to the wireless terminal 4 from other networks. It is. The buffer 25 buffers the data from the NW interface unit 214 and the DL / UL MAP (map) generated by the scheduling unit 213 so that the data is transmitted from the transmission unit 216 at a predetermined timing.

The transmission unit 216 transmits a signal or message from the buffer 25 to the relay station 3B or the wireless terminal 4-1. That is, as described above, the DL MAP (map) generated by the scheduling unit 213 and specifying the RNG-RSP area is transmitted to the relay station 3B and the terminal 4-1.
In the second embodiment, since the relay unit 3B and the radio base station 2B are configured as described above, for example, as shown in the signal sequence of FIG. A control message in which information of Ranging Codes # 1 to # 3 from 4-23 is aggregated is transmitted to the radio base station 2B, and the contents of the DL MAP (map) from the radio base station 2B are described. While complementing, it is possible to transmit the power / timing adjustment information for the individual radio terminals 4-21 to 4-23 to the RNG-RSP area specified by the DL MAP (map).

  Specifically, when the receiving unit 311 and the Code receiving unit 312 of the relay station 3B receive, for example, a Ranging Code as a signal and a message from the plurality of wireless terminals 4-21 to 4-23, the reception is performed. The communication control information for communication control between the wireless terminals 4-21 to 4-23 and the relay station 3B is obtained by using the code number, the frame position, and the frame number information, which are the information of the ranging code (ranging code). Is stored in the storage unit 313. Further, the code receiving unit 312 measures the received power and the reception timing from the received signal of the ranging code (ranging code), and generates power / power to the wireless terminals 4-21 to 4-23 generated based on the measurement result. The timing adjustment information is stored in the storage unit 313.

Further, the aggregating unit 314 aggregates the information of the ranging codes (ranging codes) from the radio terminals 4-21 to 4-23, and the notifying unit 315 and the transmitting unit 316 convert the aggregated information to the radio base station. 2B (see “RS Ranging Message” in FIG. 9, see FIG. 12).
In the radio base station 2B, the reception unit 211 and the control message extraction unit 212 receive the above-described aggregated information from the relay station 3B, and the scheduling unit 213 uses the received aggregated information to generate the radio base station 2B. Scheduling information (DL MAP (map)) for communication between each of the wireless terminals 4-21 to 4-23 via the base station 2B and the relay station 3B is generated, and the buffer unit 215 and the transmission unit 216 are generated. Then, the scheduling information generated as described above is transmitted to the relay station 3B (see R3 in FIG. 9). At this time, the RNG-RSP area specified by the DL MAP (map) does not include specific power / timing adjustment information as a response to the Ranging Code, and is substantially blank. ing.

  The scheduling information transmitted from the radio base station 2B is received by the receiving unit 311 and the DL MAP (map) extracting unit 317 of the relay station 3B, and the DL MAP (map) that is the received scheduling information is received by the relay unit 318. Then, the contents are complemented according to the communication control information stored in the storage unit 313, and the power / timing adjustment information for each of the wireless terminals 4-21 to 4-23 is written in the RNG-RSP area. Then, the transmission unit 316 transmits the power / timing adjustment information to the radio terminals 4-21 to 4-23 through the RNG-RSP area together with the scheduling information whose contents are complemented.

In addition, in each of the wireless terminals 4-21 to 4-23, power / timing adjustment information for the transmitted Ranging Code (ranging code) is obtained from the RNG-RSP area while referring to the contents of the DL MAP (map). The signal can be transmitted at the transmission power and timing according to the extracted adjustment information.
As described above, according to the second embodiment of the present invention, the relay station 3 supplements the DL MAP (map) information corresponding to the radio terminals 4-21 to 4-23, and the power / timing is set in the RNG-RSP area. Since the adjustment information can be written, there is an advantage that information to be transmitted to the radio base station 2B can be reduced to effectively use radio communication resources.

In the above-described second embodiment, a case has been described in which the relay station 3B accommodates a plurality of radio terminals 4-21 to 4-23. However, according to the present invention, the present invention is not limited to this. Similarly, when wireless terminals are accommodated, the wireless communication resources can be effectively used.
[C] Description of the Third Embodiment In the third embodiment, the radio base station 2 and the radio terminal 4 are provided and the relay station 3 is introduced as in the case of the first and second embodiments described above. A case where the relay station 3 receives a CQI (Channel Quality Indicator) report in the wireless communication system will be described. The CQI report is for notifying the radio base station 2 of the radio signal quality at the radio terminal 4-2 via the relay station 3. The radio base station 2 can receive CQI reports from the radio terminal 4-2 at regular intervals, and can adaptively switch to the optimum radio communication system based on the changing CQI value. For example, if the reception quality is good, the wireless communication method is suitable for high-speed communication, while if the reception quality is not good, the wireless communication method is low-speed but relatively resistant to the noise environment. For example, the CQI includes a CINR (Career to Interference and Noise Ratio) that is a quality index value that can be measured without decoding the received signal.
Outline of Signal Sequence in Third Embodiment FIG. 14 is a diagram showing a signal sequence for a CQI report and a response signal transmitted from the radio terminal 4-2 (see FIG. 1) in the third embodiment of the present invention. . As shown in FIG. 14, each time the relay station 3 receives CQI reports RP1 to RP4 received at a fixed period from the connected wireless terminal 4-2, the relay station 3 stores it each time. Compare with previous CQI report information. Here, the description will be given focusing on the case where a CQI report is received from one wireless terminal 4-2 connected to the relay station 3, but the same applies to the case where a plurality of wireless terminals 4-2 are connected. is there.

  Then, as a result of this comparison, only when it is determined that it is better to change the wireless communication method used between the relay station 3 and the wireless terminal 4-2, the wireless base station 2 is connected to the relay station 3 and the wireless terminal 4-2. Information on the wireless communication system used between the two. For example, the relay station 3 determines whether the wireless communication method should be changed based on the content of the CQI report RP3 from the wireless terminal 4-2 compared with the content of the CQI report received in the past (for example, the immediately preceding RP2). At the same time, the wireless communication system after the change is determined. And the change information about this wireless communication system is notified (MS Burst Profile Info).

The radio base station 2 performs scheduling based on the radio communication scheme information from the changed radio terminals 4-21 to 4-23, generates a DL / UL MAP (map), and transmits it to the relay station 3. Thereby, the amount of information to be communicated between the relay station 3 and the radio base station 2 is reduced, and effective use of radio communication is achieved.
-Configuration of relay station in the third embodiment When the relay station 3 in the third embodiment pays attention to the function for improving the efficiency of the radio communication resources as described above, the relay station 3 receives a radio signal as in the relay station 3C shown in FIG. A unit 321, a CQI receiving unit 322, a storage unit 323, a determination unit 324, a notification unit 325 and a transmission unit 326 are provided.

  Here, the receiving unit 311 receives signals or messages from the radio terminal 4-2 and the radio base station 2. Also, the CQI receiving unit 322 extracts a CQI report that is a signal or message indicating the state of the wireless channel from the signal or message from the wireless terminal 4-2 received by the receiving unit 321. Therefore, the receiving unit 321 and the CQI receiving unit 322 described above constitute a terminal-side receiving unit that receives signal and message information received from the wireless terminal.

  The storage unit 323 stores the contents of the CQI report from the wireless terminal 4-2 received by the CQI receiving unit 322 for each wireless terminal 4-2. FIG. 16 shows information stored in the storage unit 323. As shown in FIG. 16, in the storage unit 323, the MS ID, CINR that is ID information of the wireless terminal is provided for each wireless terminal 4-2 connected to the relay station 3 through a writing operation by the determination unit 324 described later. The index value of the wireless communication system (Burst Profile) suitable for the value and the CINR value is also held.

  Also, the determination unit 324 determines whether or not to notify the radio base station 2 of related information related to the signal and message received from the radio terminal 4-2 based on the information received by the CQI reception unit 322. Is. That is, based on the CQI information received by the CQI receiving unit 322, that is, information on the radio channel state between the relay station 3 and the radio terminal 4-2, the radio used between the relay station 3 and the radio terminal 4-2. When the communication method needs to be changed, it is determined that information (related information) related to the radio channel state should be notified to the radio base station 2.

  Specifically, the determination unit 324 first extracts and selects a wireless communication method suitable for the information received by the CQI reception unit 322 by referring to a table (not shown) included in the storage unit 323. That is, according to the CINR value, for example, in the case of relatively high quality, a wireless communication method suitable for relatively high speed transmission is extracted and selected, while in the case of relatively low quality, it is suitable for relatively low speed transmission. Extract and select a wireless communication system with relatively high noise resistance. Note that, as the selected wireless communication method, a modulation method, a coding method, a coding rate, and the like can be used as parameters (elements).

  Then, a difference between the wireless communication method extracted and selected in this way and the wireless communication method stored in the storage unit 323 (extracted from the CINR value in the CQI report received immediately before is determined. If the wireless communication systems are different as a result of the determination, it is determined that the wireless communication system used between the relay station 3 and the wireless terminal 4-2 needs to be changed to the newly extracted / selected wireless communication system. On the other hand, if the wireless communication system is the same as a result of the above determination, it is determined that there is no need to change the wireless communication system used between the relay station 3 and the wireless terminal 4-2.

The determination unit 324 stores the CINR value and the extracted / selected wireless communication method in association with the ID information of the corresponding wireless terminal 4-2 each time the determination of the wireless communication method is completed as described above. Part 323 can be written.
The notification unit 325 should notify the wireless base station 2 of wireless communication system change information, which is information related to the state of the wireless channel received from the wireless terminal 4-2 in the determining unit 324 (that is, wireless communication). If it is determined that the system should be changed), the wireless communication system change information as the related information is generated as a control message and output to the subsequent transmission unit 326. The transmission unit 326 transmits the control message generated by the notification unit 325 to the radio base station 2. Therefore, the wireless communication system change information is notified to the wireless base station 2 by the cooperation of the notification unit 325 and the transmission unit 326.

On the other hand, if the determination unit 324 determines that it is not necessary to notify the wireless communication method change information (that is, it is not necessary to change the wireless communication method), the wireless communication method change information as related information is notified. Notification is not performed through 325 and the transmission unit 326.
FIG. 17 shows an example of information of a control message for changing the radio communication scheme transmitted from the relay station 3C to the radio base station 2. As information of this control message, the ID (RS ID) of the relay station 3 that indicates the transmission source of the control message, the type (Message Type) that indicates this control message, and the ID of the wireless terminal that is determined to need to be changed. (MS ID) and a wireless communication system index value (Burst Profile) to be changed.

The radio base station 2 recognizes a radio communication scheme used between the relay station 3 and the radio terminal 4-2 based on the received control message, and generates a DL / UL MAP (map) based on the radio communication scheme. .
In the third embodiment, since the relay unit 3C is configured as described above, the relay station 3C receives CQI reports RP1 to RP4 that are received from the connected wireless terminal 4-2 at a constant period. In this case, it is necessary to change the radio communication system based on the contents of the CQI without transmitting the contents of the CQI report in order to create the UL / DL MAP (map) to the radio base station 2 each time. It is sufficient to transmit to the radio base station 2 only when it is determined.

  That is, the determination unit 324 of the relay station 3C compares the previous CQI report information stored in the storage unit 323 with the wireless communication method information obtained from the current CQI report. Then, as a result of this comparison, only when it is determined that it is better to change the radio communication method used between the relay station 3C and the radio terminal 4-2, the radio base station 2 is connected to the relay station 3 and the radio terminal 4-2. The control message is notified of information on the wireless communication method used between the two.

As described above, according to the third embodiment, the relay station 3C transmits an opportunity to transmit a control message related to the content of the CQI report transmitted from the wireless terminal 4-2 every time the CQI report is received. Therefore, there is an advantage that information to be transmitted to the radio base station 2B can be reduced to effectively use radio communication resources.
[B] Others Regardless of the embodiment described above, various modifications can be made without departing from the spirit of the present invention.

  For example, in the relay stations 3A and 3B in the first and second embodiments described above, the information of the uplink signal or message from the wireless terminal 4-2 is stored as the communication control information in the storage units 303 and 313. However, according to the present invention, the present invention is not limited to this. For example, if information that should be supplemented as scheduling information in the complement unit is known, it is not information on an uplink signal or message from the wireless terminal 4-2, but in advance. This may be stored in the storage units 303 and 313.

Further, according to the relay station of the present invention, the band request signal such as the above-described BW Request Code and the signal other than the power / timing adjustment signal such as the Ranging Code are also aggregated. It is possible to consolidate the data in a part, and thereby the band can be effectively used.
Moreover, it is possible for those skilled in the art to manufacture the apparatus of the present invention based on the disclosure of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Radio | wireless communications system 2, 2A, 2B Radio base station 2a Cover area 3, 3A-3C Relay station 4-1, 4-2, 4-21-4-23 Wireless terminal 100 Cover area 101 Wireless base station 102 Wireless terminal 201 , 211 receiving unit 202, 212 control message extracting unit 203, 213 scheduling unit 204, 214 NW interface unit 205, 215 buffer unit 206, 216 transmitting unit 301, 311, 321 receiving unit 302, 312, 322 Code receiving unit 303, 313 , 323 Storage unit 304, 314 Aggregation unit 305, 315, 325 Notification unit 306, 316, 326 Transmission unit 307 UL MAP (map) extraction unit 308, 318 Relay unit 317 DL MAP (map) extraction unit 324 Judgment unit

Claims (1)

A wireless communication system comprising a wireless terminal, a wireless base station that wirelessly communicates with the wireless terminal, and a relay station that relays between the wireless terminal and the wireless base station,
The relay station
A radio channel state receiving unit for receiving information on a radio channel state between the relay station and the wireless terminal from the wireless terminal;
A determination unit that determines whether or not it is necessary to change a wireless communication method used between the wireless base station and the wireless terminal via the relay station based on the information received by the wireless channel state reception unit; ,
Only when the determination unit determines that the wireless communication method needs to be changed, the information on the wireless channel state between the relay station and the wireless terminal and at least one of the wireless communication methods are related. And a notification unit for notifying the radio base station as information,
The radio base station
Based on the related information notified from the notification unit, the wireless communication method used between the wireless base station and the wireless terminal via the relay station is changed, and the wireless communication method is changed. A scheduling information generator for generating scheduling information in the communication,
A transmission unit for transmitting the scheduling information generated by the scheduling information generation unit to the relay station,
A wireless communication system.

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