JP2006005653A - Method and system for radio access control - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and system for centralized control type radio access control which can improve use efficiency of radio resources and are adaptive to multi-hop communication. <P>SOLUTION: The centralized control type radio access control method in which a radio base station 1 performs centralized management of communication with a plurality of radio terminals 2 includes a 1st procedure in which the radio base station 1 periodically reports a traffic intensity report period (CP) to the respective user terminals 2, a 2nd procedure in which a user terminal 2 having transmitted data reports the traffic intensity M of the transmitted data to the radio base station 1 within the traffic intensity report period, a 3rd procedure in which the radio base station 1 determines an uploading time T to be allocated to each user terminal 2 based upon the traffic intensity M of each user terminal 2, a 4th procedure in which the radio base station 1 reports the allocation result of the uploading transmission time T to each user terminal 2, and a 5th procedure in which each user terminal 2 uses the uploading time allocated to itself to transmit the transmitted data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio access control method and system, and more particularly to a centralized control type radio access control method and system in which a radio base station centrally manages communications with radio terminals.

  The wireless LAN standardized by IEEE802.11 adopts CSMA (Carrier Sense Multiple Access) as an access control method, and basically performs autonomous distributed control. However, since there is a possibility that packets may collide over the air in the CSMA method, a centralized control type MAC called PCF (Point Coordination Function) is an option for centralized control based on the polling function. It is stipulated in.

Polling is a centralized control method in which a base station sequentially sends transmission inquiries to user terminals and gives transmission rights to terminals that respond. Each user terminal transmits only when its own station is designated by polling. Returns “Yes” (ACK) / None (NAK), and returns ACK with data only when there is data to be transmitted. A wireless relay access system using such polling is disclosed in Patent Document 1.
Japanese Patent Laid-Open No. 2004-1228829

  In PCF, a radio base station must transmit polling to all user terminals regardless of whether or not each user terminal owns transmission data. there were. In addition, since multi-hop communication was not possible with PCF, even if a multi-hop route with good line quality could be established, communication could not be performed using this route.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a centralized control type radio access control method and system that solves the above-described problems of the prior art, can use radio resources efficiently, and can be applied to multi-hop communication. .

  In order to achieve the above object, the present invention is characterized in that the following measures are taken in a centralized control type radio access control method in which a radio base station centrally manages communications with a plurality of radio terminals. is there.

  (1) A first procedure in which a radio base station periodically notifies each radio terminal of a traffic volume notification period, and a radio terminal having transmission data transmits the traffic of the transmission data within the notified traffic volume notification period. A second procedure for notifying the radio base station of the amount, a third procedure for determining an uplink transmission time allocated to each radio terminal by the radio base station based on the notified traffic volume, and the radio base station Includes a fourth procedure for notifying each wireless terminal of the determination result and a fifth procedure for transmitting the transmission data by each wireless terminal using an uplink transmission time assigned to the wireless terminal. And

  (2) The wireless terminal further includes a procedure for detecting the remaining traffic amount after data transmission in advance. In the fifth procedure, the remaining traffic amount is transmitted to the wireless base station together with transmission data, and the remaining traffic amount is eliminated. Until the wireless terminal that has notified the remaining traffic amount does not execute the second procedure, and in the third procedure, based on the traffic amount or the remaining traffic amount notified from each wireless terminal. The uplink transmission time allocated to each wireless terminal is determined.

  (3) Before the third procedure, a procedure for establishing a multi-hop route for relaying another wireless terminal between a wireless terminal having transmission data and a wireless base station, and each wireless terminal on the route A procedure for notifying the radio base station of the tree information of the path, and a procedure for determining the tree structure of the path based on the tree information notified from each radio terminal on the path by the radio base station; In the third procedure, all the wireless terminals on the route have the traffic volume of their own terminal and the traffic volume of the relayed wireless terminal based on the traffic volume of each wireless terminal and the tree structure. In accordance with the fifth procedure, transmission data is transmitted using the route.

  (4) The procedure for establishing the multi-hop route includes a procedure in which a wireless terminal having transmission data transmits a route establishment request to a wireless base station, and the wireless base station sends a route establishment response to the route establishment request. The wireless terminal transmits the traffic volume of the transmission data together with the route establishment request.

According to the present invention, the following effects are achieved.
(1) Only a wireless terminal having transmission data requests data transmission to the wireless base station, and the wireless base station allocates uplink transmission time only to the wireless terminal requesting data transmission. An inquiry from a wireless base station to a wireless terminal that has not been made becomes unnecessary, and wireless resources can be used effectively.
(2) Since the wireless terminal detects in advance the remaining amount of traffic after data transmission, and transmits this to the wireless base station together with the transmission data, it notifies the wireless base station only for notifying the remaining amount of traffic. Becomes unnecessary, and more effective use of radio resources becomes possible.
(3) In multi-hop communication, for each wireless terminal on the route, the route tree structure, the traffic volume of each wireless terminal's own transmission data, and the traffic of other wireless terminals on the route relayed by each wireless terminal Since the uplink transmission time is assigned based on the amount, an appropriate uplink transmission time can be assigned to each wireless terminal.
(4) In multi-hop communication, since the traffic volume of transmission data is registered in the path establishment request message transmitted from the radio terminal to the radio base station in order to establish a path, the radio base only for notifying the traffic volume Access to the station is not required, and wireless resources can be used more effectively.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a first embodiment of a radio access control system according to the present invention. A radio base station (AP) 1 and a plurality of user terminals (in the communication effective range 4 of the radio base station 1) The wireless base station 1 is connected to a wide area network 3 such as the Internet. In the first embodiment, each user terminal 2 that has moved to the communication effective range 4 of the radio base station 1 and the radio base station 1 perform direct communication in a single hop without using a relay station.

  3 and 4 are flowcharts showing the operation of the present embodiment, FIG. 3 shows the data transmission operation of the user terminal 2, and FIG. 4 shows the data reception operation of the radio base station 1. FIG. 5 is a sequence flow showing the operation of this embodiment. Here, as shown in FIG. 6, a case where the user terminal 2a newly moves to the effective communication range 4 to start data communication, and then another user terminal 2b moves to start data communication. An example will be described.

  The radio base station 1 and each user terminal 2 periodically transmit and receive data using a communication frame managed by the radio base station 1. As shown in FIG. 2, the communication frame includes a CP (Contention Period: access control period assuming a collision) and a CFP (Contention-Free Period: access control period that does not cause a collision). The radio base station 1 transmits a beacon between the CP and the CFP.

  In the CP, the amount of traffic M (Ma, Mb...) Of a data packet to be transmitted by each user terminal 2 (2a, 2b...) Is notified from each user terminal 2 to the radio base station 1. In CFP, each user terminal 2 transmits a data packet to the radio base station 1 using the uplink transmission time T (Ta, Tb...) Assigned by the radio base station 1, and is also assigned by the radio base station 1. The data packet is transmitted from the radio base station 1 to each user terminal 2 using the downlink transmission time. In the beacon, the time information for specifying the CP and the time information for designating the uplink transmission time T and the downlink transmission time assigned to each user terminal 2 are relative times based on the transmission time of the beacon. Or it is registered as an absolute time.

  When the user terminal 2a that has moved to the communication effective range 4 of the radio base station 1 receives the beacon at step S1 in FIG. 3, has the traffic amount M of transmission data been notified to the radio base station 1 at step S2? It is determined whether or not. Since it is determined that the notification has not been made at first, the process proceeds to step S3, and the timing of the CP is detected based on the time information registered in the beacon. In step S4, the presence / absence of transmission data is determined. Until transmission data is generated, the process returns to step S1 and the above-described processes are repeated.

  Thereafter, transmission data is generated, and when this is detected in step S4, the process proceeds to step S5, and the traffic amount M (Ma) of the transmission data is obtained. In step S6, it is determined whether or not the CP has been entered. When entering CP, the process proceeds to step S7, and the RTS_M signal in which the traffic amount Ma is registered in a predetermined field of an RTS (Request To Send) signal is transmitted to the radio base station 1.

  Proceeding to FIG. 4, when the radio base station 1 transmits the beacon in step S41, in step S42, the user terminal 2 prepares for reception of data transmitted using each uplink transmission time T of the CFP. At first, since the user terminal 2 does not exist in the effective communication range 4 and no data packet is received, the process proceeds to step S46, waits for the end of CFP, and proceeds to step S47.

  When the radio base station 1 receives the RTS_M signal transmitted from the user terminal 2a in step S47, the traffic amount Ma registered in a predetermined field of the RTS_M signal is detected in step S48. In step S49, a CTS (Confirmation To Send) _M signal is returned in response to the received RTS_M signal. In step S50, based on the traffic amount Ma notified from the user terminal 2a, an uplink transmission time T (Ta) to be assigned to the user terminal 2a in the CFP is determined. In the present embodiment, a longer uplink transmission time T is assigned to a user terminal with a large traffic amount M.

  In step S51, it is determined whether or not the current CP has been completed. During the CP, each process described above is repeated for all the RTS_M signals transmitted from each user terminal 2. When the CP ends, the process returns to step S41, and the uplink transmission time allocation result is registered in the predetermined field of the beacon and transmitted.

  Returning to FIG. 3, when the user terminal 2 a receives the next beacon in step S <b> 1 in FIG. 3, in step S <b> 2, it is determined whether or not the wireless base station 1 has been notified of the traffic amount M of the transmission data. . If the CTS_M signal is returned from the radio base station 1 in response to the RTS_M signal transmitted in step S7, it is determined that the traffic amount M has been notified to the radio base station 1, and the process proceeds to step S8. In step S8, it is determined whether or not there is untransmitted data. Since no data packet has been transmitted yet, it is determined that there is untransmitted data, and the process proceeds to step S9. In step S9, an allocation result relating to the uplink transmission time Ta of the terminal registered in the beacon is extracted. In step S10, the remaining traffic ma after transmitting data using this upstream transmission time Ta is detected in advance. In step S11, when the uplink transmission time Ta assigned to the terminal is reached, a data packet is transmitted to the radio base station 1 in step S12. In this data packet, information related to the remaining traffic ma is also registered.

  Returning to FIG. 4, after transmitting the beacon in step S41, the radio base station 1 receives the data transmitted by the user terminal 2a using the uplink transmission time Ta in step S42. A predetermined reception process is executed. In step S44, it is determined whether or not the traffic remaining amount m is registered in the data. If registered, the process proceeds to step S45, and the traffic remaining amount m is detected. In step S46, it is determined whether or not the current CFP is completed, and data transmitted at each uplink transmission time is received until the CFP is completed.

  If it is determined in step S46 that the current CFP has been completed, the process proceeds to step S47, and it is determined whether or not the RTS_M signal has been received. Here, since the RTS_M signal is not received, the process proceeds to step S50, and the next uplink transmission time Ta is determined based on the remaining traffic ma notified from the user terminal 2a. If it is determined in step S51 that the current CP has ended, the process returns to step S41, and the uplink transmission time allocation result is registered in a predetermined field of the beacon and transmitted.

  When receiving the next beacon in step S1, the user terminal 2a proceeds to step S3 via step S2, and determines whether or not there is untransmitted data as described above. If all the data has been transmitted in the previous step S12, since there is no untransmitted data, the process returns to step S3, and the processes in steps S1 to S4 are repeated until new transmission data is generated.

  On the other hand, if all the data has not been transmitted in the previous step S12, since there is untransmitted data, the process proceeds to step S9, and the remaining transmission is performed using the uplink transmission time Ta specified by the current beacon. Send data. Also in this data, the remaining traffic ma detected in the immediately preceding step S10 is registered.

  Thereafter, when the other user terminal 2b moves to the communication effective range 4 and the traffic amount Mb transmitted from the user terminal 2b is detected by the radio base station 1 in step S48 of FIG. 4, in step S50, Based on the remaining traffic ma of the user terminal 2a detected in step S45 and the traffic amount Mb of the user terminal 2b newly detected in step S48, the uplink transmission times Ta, Tb is determined.

  FIG. 7 is a functional block diagram of the user terminal 2 in the first embodiment of the present invention described above. As a specific function corresponding to the type of each wireless communication unit 10 for transmitting and receiving wireless signals and each user terminal, for example, mobile A wireless terminal function unit 11 that performs a telephone function and a PDA function, a traffic amount detection unit 12 that detects a traffic amount M of transmission data, a traffic remaining amount detection unit 13 that detects a traffic remaining amount m of untransmitted data, A CP detection unit 14 that detects the CP (Contention Period) based on a beacon transmitted from the radio base station 1, and an uplink transmission time identification unit that identifies the uplink transmission time T assigned to the terminal by the radio base station 1 15 and the like.

  FIG. 8 is a functional block diagram of the radio base station 1 in the first embodiment of the present invention described above, and includes a radio communication unit 30 that transmits and receives radio signals, a beacon transmission unit 31 that periodically transmits beacons, Based on the traffic amount M or the remaining traffic amount m notified from the user terminal 2, an uplink transmission time allocation unit 32 that allocates an uplink transmission time T to each user terminal, and an allocation result that notifies the user terminal 2 of the allocation result A notification unit 33.

  According to the present embodiment, only the user terminal 2 having transmission data requests the radio base station 2 to transmit data, and the radio base station 1 transmits the uplink transmission time only to the user terminal 2 requesting data transmission. Since T is allocated, useless inquiry (polling) from the radio base station 1 to the user terminal 2 that does not have transmission data is unnecessary, and radio resources can be effectively used.

  Further, in the present embodiment, the user terminal 2 detects in advance the remaining traffic m after data transmission, and transmits this to the radio base station 1 together with the transmission data for notification, so only to notify the remaining traffic m. Access to the wireless base station 1 becomes unnecessary, and wireless resources can be used more effectively.

  FIG. 9 is a block diagram of a second embodiment of the radio access control system according to the present invention, and the radio base station 1 and a plurality of user terminals (radio terminals) located within the communication effective range of the radio base station 1 2, and the wireless base station 1 is connected to a wide area network 3 such as the Internet. In the present embodiment, each user terminal 2 located in the effective communication range 4 of the radio base station 1 and the radio base station 1 can communicate indirectly by multi-hop via the other user terminals 2. It is.

  10, 11, 12, and 13 are flowcharts showing the operation of the second embodiment of the present invention. FIGS. 10 and 11 show the operation of the user terminal 2. FIG. 12 shows another user who functions as a relay station. FIG. 13 shows the operation of the radio base station 1. In any case, the same or equivalent processes are executed in the steps given the same numbers as above. FIG. 14 is a sequence flow showing the operation of the present embodiment.

  When the user terminal 2a receives the beacon in step S1 in FIG. 10, it is determined in step S2 whether or not the wireless base station 1 has been notified of the traffic amount M of the transmission data. Since it is determined that notification has not been made at first, the process proceeds to step S3, and the CP is detected based on time information registered in the beacon. In step S4, the presence / absence of transmission data is determined. Until transmission data is generated, the process returns to step S1 and the above-described processes are repeated.

  Thereafter, transmission data is generated, and when this is detected in step S4, the process proceeds to step S5, and the traffic amount Ma of the transmission data is detected. If it is detected in step S6 that the CP has been entered, the process proceeds to step S13, where it is determined whether or not the route information to the destination (wireless base station 1) is already registered in the routing table. If the route information is already registered, the process proceeds to step S7, and the traffic amount Ma is notified to the radio base station 1 as in the first embodiment. If the route information is not registered, the process proceeds to step S14, and the “route establishment process” is executed.

  FIG. 11 is a flowchart showing the procedure of the “route establishment process”. In step S131, the traffic amount Ma, the link quality metric Q, and the route establishment request (in the predetermined fields of the RTS (Request To Send) signal) RREQ) registered RTS_RREQ signal is transmitted to the radio base station 1. The link quality metric Q is information representative of the quality of the link through which the RTS_RREQ signal passes, and an initial value “0” is registered in the RTS_RREQ signal transmitted from the user terminal 2a that is the transmission source. Step S132 prepares for reception of the CTS_RREP signal, which is a response to the RTS_RREQ signal.

  FIG. 12 is a flowchart showing a procedure of relay processing of another user terminal functioning as a relay station.

  When the RTS_RREQ signal is received from the adjacent terminal in step S21, a link quality metric Qx between the adjacent terminal and the own terminal is obtained based on the reception strength of the RTS_RREQ signal in step S22. In step S23, by adding the link quality metric Qx between the adjacent terminal and the own terminal to the link quality metric Q from the user terminal 2a as the transmission source to the adjacent terminal registered in the RTS_RREQ signal. The link quality metric Q from the transmission source user terminal to the own terminal is calculated. The method for obtaining the link quality metric Q is described in detail in a patent application (Japanese Patent Application No. 2003-196727) filed by the present applicant.

  In step S24, the combination of the MAC address of the transmission source user terminal and the MAC address of the adjacent terminal registered in the RTS_RREQ signal is registered in the routing table as route information. If the route establishment is to be realized in the network layer (generally, the IP layer) as in the prior art, the IP address is used as the source address and the destination address. Two types of addresses such as “address at IP layer” are required, but in this embodiment, since path establishment is realized at the link layer (MAC layer), compared to the case of establishing at the IP layer as in the past, Wireless resources can be used effectively.

  In step S25, the calculated link quality metric Q is updated and registered in the RTS_RREQ signal and transmitted by broadcast. The relay process described above is executed in all user terminals that have received the RTS_RREQ signal.

  Proceeding to FIG. 13, the radio base station 1 transmits the beacon in step S41, and then receives the RTS_RREQ signal in step S61. In step S62, the end terminal has already received the same RTS_RREQ signal through another path. It is determined whether or not there is. In this embodiment, since all the user terminals 2 are located in the effective communication range 4, the radio base station 1 directly receives the RTS_RREQ signal transmitted from the user terminal 2a from the user terminal 2a, and others It is also received indirectly from other user terminals.

  If it is determined in step S62 that the current reception is the first, the process proceeds to step S63, and the traffic amount M and link quality metric Q registered in a predetermined area of the RTS_RREQ signal are detected. In step S64, route information is created based on the RTS_RREQ signal, and is registered in the routing table together with the detected traffic amount M and link quality metric Q. In step S65, the CTS_RREP signal is returned in unicast to the RTS_RREQ signal. In step S66, the system waits for reception of tree information described later.

  On the other hand, if it is determined in step S62 that the end terminal has received the same RTS_RREQ signal through another route, the process proceeds to step S70, where the link quality metric Q (1) registered in the routing table and the RTS_RREQ received this time are received. The link quality metric Q (2) registered in the signal is compared. Here, if Q (2)> Q (1), the link quality of the current route is superior to the route having the best link quality so far, and the process proceeds to step S71. In step S71, the route information already registered in the routing table is updated based on the RTS_RREQ signal received this time. In step S72, the CTS_RREP signal with the updated sequence number is returned again by unicast to the current RTS_RREQ signal.

  Returning to FIG. 12, when the user terminal functioning as a relay station receives the CTS_RREP signal in step S26, in step S27, the pair of the destination address and the address of the adjacent terminal is registered as routing information in the routing table. At this time, if the route information related to the same route is already registered, the freshness of both is compared based on the sequence number registered in the received CTS_RREP signal and the sequence number of the registered information, and new route information of freshness is obtained. have priority. In step S28, the CTS_RREP signal is relayed to the destination user terminal 2 by unicast. In step S29, based on the updated route information, information related to the adjacent terminal on the route is transmitted to the radio base station 1 as tree information by unicast.

  Returning to FIG. 11, when the user terminal 2 receives the CTS_RREP signal sent back from the radio base station 1 directly or indirectly via the relay terminal in step S132, the process proceeds to step S133, and the route information is registered in the routing table. To do. At this time, if the route information regarding the same route is already registered, the freshness of both is compared based on the sequence number registered in the received CTS_RREP signal and the sequence number of the registered information. Prioritize. In step S134, it is determined whether the reception period of the CTS_RREP signal has timed out. The process returns to step S132 until time-out, and the path information is updated each time a new CTS_RREP signal with a sequence number is received.

  Returning to FIG. 13, when the radio base station 1 receives the tree information returned from the relay terminal in step S66, the radio base station 1 proceeds to step S67 and registers the tree information. In step S68, it is determined whether tree information has been returned from all relay terminals on the route. When all the tree information is obtained, the process proceeds to step S69, and the tree structure of the path is identified. In step S70, the uplink transmission time is assigned to each user terminal on the route based on the traffic amount M (or remaining traffic amount) notified from each user terminal on the route and the tree structure identification result.

  FIG. 15 is a diagram schematically illustrating an uplink transmission time T allocation method according to the present embodiment. Here, as illustrated in FIG. 9, as shown in FIG. 9, the transmission source user terminal 2 a to the other two user terminals 2 b, A case will be described as an example in which a first route reaching the radio base station 1 via 2c and a second route directly connecting the user terminal 2d as another transmission source and the radio base station 1 are established. .

  The radio base station 1 recognizes the arrangement of each user terminal on the route based on the tree structure. The user terminals 2a and 2d that do not relay transmission data are assigned uplink transmission times Ta and Td according to the traffic amounts Ma and Md, respectively. The user terminal 2b that relays the transmission data of the user terminal 2a receives the uplink transmission time Tb according to the added value of the traffic amount Mb of the user terminal 2b and the traffic amount Ma of the user terminal 2a relayed by the user terminal 2b. Assigned. Similarly, the user terminal 2c that relays the transmission data of the two user terminals 2a and 2b includes the traffic volume Mc of the user terminal 2c and the traffic volume Ma of the two user terminals 2a and 2b relayed by the user terminal 2c. , Mb is assigned an uplink transmission time Tc according to the added value. The radio base station 1 collectively receives data transmitted from the user terminals 2a, 2b, and 2c on the first route at the uplink transmission time Tc.

  In step S51, it is determined whether or not the current CP has been completed. During the CP, the above-described processes are repeated for all RTS_RREQ signals transmitted from each user terminal 2. When the CP ends, the process returns to step S41, and the uplink transmission time allocation result is registered in the predetermined field of the beacon and transmitted.

  FIG. 16 is a functional block diagram of the user terminal 2 in the second embodiment of the present invention described above, and the same reference numerals as those in FIG. 7 represent the same or equivalent parts.

  In the present embodiment, in addition to the configuration of the first embodiment, a route establishment unit 16 that establishes a multi-hop route with the radio base station 1 based on transmission of a route establishment request and reception of a route establishment response, and a route The link quality monitoring unit 17 that monitors the link quality of the network and the route information is generated based on the relayed route establishment request and the route establishment response, and is registered in the routing table 19 and is routed based on the route information. A routing unit 18 and a tree information return unit 20 that returns the tree information to the radio base station 1 when the route establishment response is relayed.

  FIG. 17 is a functional block diagram of the user terminal 2 in the second embodiment of the present invention described above, and the same reference numerals as those in FIG. 8 represent the same or equivalent parts.

  In the present embodiment, in addition to the configuration of the first embodiment, a route establishment unit 34 that establishes a multi-hop route with the user terminal 2 based on reception of a route establishment request and transmission of a route establishment response is received. Route information is generated based on the route establishment request, and is registered in the routing table 36. At the same time, the routing unit 35 that performs routing based on the route information and the tree information are received to determine the tree structure of the route. The uplink transmission time allocation unit 32 includes a tree structure determination unit 37 and appropriately allocates the uplink transmission time to each user terminal based on the traffic amount transmitted from each user terminal 2 and the tree structure of the route.

  According to the present embodiment, in multi-hop communication, for each user terminal on the route, the tree structure of the route, the amount of traffic of the transmission data of each user terminal itself, and other on the route relayed by each user terminal Since the uplink transmission time is assigned based on the traffic volume of the user terminal, an appropriate uplink transmission time can be assigned to each user terminal.

  In this embodiment, since the traffic amount of the transmission data is registered in the route establishment request message transmitted from the wireless terminal to the wireless base station in order to establish the route, the wireless base station only for notifying the traffic amount Access to the wireless network becomes unnecessary, and the wireless resource can be used more effectively.

1 is a block diagram of a first embodiment of a wireless access control system according to the present invention. FIG. It is the figure which showed an example of the communication frame managed by the wireless base station. It is the flowchart which showed the data transmission operation | movement of a user terminal. It is the flowchart which showed the data reception operation | movement of a wireless base station. It is the sequence flow which showed the operation | movement of 1st Embodiment. It is the figure which showed an example of arrangement | positioning of a user terminal. It is a functional block diagram of a user terminal in a 1st embodiment of the present invention. It is a functional block diagram of the wireless base station in 1st Embodiment of this invention. It is a block diagram of 2nd Embodiment of the radio | wireless access control system which concerns on this invention. It is the flowchart which showed the data transmission operation | movement of a user terminal. It is a flowchart of the route establishment process in a user terminal. It is a flowchart of the relay process in a relay station. It is the flowchart which showed the data reception operation | movement of a wireless base station. It is the sequence flow which showed the operation | movement of 2nd Embodiment. It is the figure which represented typically the allocation method of the uplink transmission time in 2nd Embodiment. It is a functional block diagram of a user terminal in a 2nd embodiment. It is a functional block diagram of the radio base station in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wireless base station, 2 ... User terminal, 3 ... Wide area network, 4 ... Communication effective range

Claims (11)

In a centralized control type radio access control method in which a radio base station centrally manages communication with a plurality of radio terminals,
A first procedure in which a radio base station periodically notifies each radio terminal of a traffic volume notification period;
A second procedure in which a wireless terminal having transmission data notifies the wireless base station of the traffic amount of the transmission data within the notified traffic amount notification period;
A third procedure in which the radio base station determines an uplink transmission time allocated to each radio terminal based on the notified traffic volume;
A fourth procedure in which the radio base station notifies each radio terminal of a determination result related to the uplink transmission time;
A centralized control type radio access control method, comprising: a fifth procedure in which each of the radio terminals transmits the transmission data by using an uplink transmission time allocated to the radio terminal. The wireless terminal further includes a procedure of detecting in advance the remaining traffic after data transmission,
In the fifth procedure, the remaining traffic is transmitted to the radio base station together with transmission data,
Repeat the above steps until the remaining traffic is resolved,
The wireless terminal that has notified the traffic remaining amount does not perform the second procedure,
2. The centralized control type according to claim 1, wherein in the third procedure, an uplink transmission time to be assigned to each wireless terminal is determined based on a traffic amount or a remaining traffic amount notified from each wireless terminal. Wireless access control method. Before the third step,
A procedure for establishing a multi-hop route for relaying other wireless terminals between a wireless terminal having transmission data and a wireless base station;
A procedure in which each wireless terminal on the route notifies the wireless base station of tree information of the route;
The wireless base station further includes a procedure for determining a tree structure of the route based on tree information notified from each wireless terminal on the route,
In the third procedure, uplink transmission according to the traffic volume of the local terminal and the traffic volume of the relayed wireless terminal is transmitted to all the wireless terminals on the route based on the traffic volume of the wireless terminal and the tree structure. Time is allocated,
The centralized wireless access control method according to claim 1, wherein in the fifth procedure, transmission data is transmitted using the route. The procedure for establishing the multi-hop route is as follows:
A procedure in which a wireless terminal having transmission data transmits a route establishment request to a wireless base station;
The wireless base station returns a route establishment response to the route establishment request, and
5. The centralized control type wireless access control method according to claim 4, wherein the wireless terminal transmits the traffic amount of the transmission data together with the route establishment request. The wireless base station determines a downlink transmission time allocated to each wireless terminal,
A procedure in which the radio base station notifies each radio terminal of a determination result related to the downlink transmission time;
5. The centralized control according to claim 1, further comprising a procedure for each of the wireless terminals to receive data from the wireless base station using a downlink transmission time assigned to the wireless terminal. Type wireless access control method. In a centralized control type wireless access control system in which a wireless base station centrally manages single-hop communication with a plurality of wireless terminals located within its effective communication range,
The wireless terminal is
Means for detecting the traffic volume of the transmitted data;
Means for recognizing a traffic amount notification period based on a beacon transmitted from a radio base station;
Means for notifying the radio base station of the traffic volume of the transmission data within the traffic volume notification period;
Means for recognizing the uplink transmission time assigned to the terminal by the radio base station;
Means for transmitting the transmission data using the uplink transmission time,
The radio base station is
Means for periodically transmitting the beacons;
Means for allocating an uplink transmission time to each wireless terminal based on the amount of traffic transmitted from each wireless terminal;
Means for notifying each wireless terminal of the uplink transmission time allocation result. The wireless terminal is
Means for detecting the remaining traffic,
Means for notifying the wireless base station of the remaining traffic amount,
The radio access control system according to claim 6, wherein the radio base station assigns an uplink transmission time to each radio terminal based on a traffic amount and a traffic remaining amount transmitted from each radio terminal. The wireless terminal further includes:
Means for establishing a multi-hop route with a radio base station based on sending a route establishment request and receiving a route establishment response;
Means for registering route information based on the relayed route establishment request and route establishment response;
Means for returning tree information of a route to a radio base station when relaying the route establishment response,
The radio base station further comprises:
Means for establishing a multi-hop route with a wireless terminal based on reception of the route establishment request and return of a route establishment response;
Means for determining a tree structure of the route based on tree information returned from each wireless terminal on the route,
The means for allocating the uplink transmission time depends on the traffic volume of each wireless terminal and the traffic volume of the relayed wireless terminal based on the traffic volume of each wireless terminal and the tree structure to all the wireless terminals on the route. 7. The radio access control system according to claim 6, wherein an uplink transmission time is allocated.   The radio access control system according to claim 6, wherein the radio terminal registers and transmits the traffic amount of the transmission data in the route establishment request.   10. The radio access control system according to claim 6, wherein the radio base station registers and transmits the uplink transmission time allocation result in the beacon. The radio base station further comprises:
Means for assigning a downlink transmission time to each wireless terminal;
11. The radio access control system according to claim 6, further comprising means for notifying each radio terminal of the downlink transmission time allocation result.

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