JP2005260809A - Wireless communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a band reservation can not be made from a wireless master unit at a direct MAC layer level since a band reservation request in a wireless block is limited to only from a wireless slave unit when IEEE802.11e is used. <P>SOLUTION: In a wireless communication apparatus, a wireless reservation instruction request is performed from a band reservation instruction request means 105 to a wireless slave unit band reservation instruction response means 205 via a wireless master unit MAC means 103 and a wireless slave unit MAC means 203, and the wireless reservation instruction response means 205 performs a band reservation instruction to the wireless slave unit MAC means 203. Thus, a wireless slave unit which receives the instruction, performs the band reservation instruction through the same procedure as the band request from the wireless slave unit, namely, from the wireless slave unit MAC means 203 to the wireless master unit MAC means, so that even in a system where a band reservation can be made only unidirectionally, the band reservation can be made bidirectionally in a pseudo manner. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bandwidth reservation method in a wireless section in a wireless communication system.

As a bandwidth reservation method in a conventional wireless communication system, a method of making a reservation from a side requesting bandwidth reservation to a side requesting bandwidth reservation is used. One example of a method for performing bandwidth reservation is RSVP (Resource Reservation Protocol). In RSVP, the data transmission side first sends a PATH signal to the data reception side, and whether the data reception side receiving the PATH signal has enough bandwidth to satisfy the bandwidth requested by the data transmission side, It is determined whether or not there is a reservation authority, and the result is notified to the data transmission side via the router. Further, in the HCCA (Hybrid Coordination Function Control Access) control method based on the IEEE 802.11e standard that is currently being formulated, when a wireless handset performs data transmission, a bandwidth reservation request is made according to the procedure shown in FIG. In FIG. 1, first, a wireless slave device that transmits data transmits a ADDTS request to the wireless master device, thereby making a bandwidth reservation request for data to be transmitted. On the wireless master side, it is determined whether the requested bandwidth can be used, and if possible, an ADDTS response is returned to the wireless slave. The wireless master device grants data transmission permission by CF-Poll, and the wireless slave device that has received the signal can transmit data.
JP 2001-16271 A IEEE P802.11e / D7.0, "Draft Amendment to STANDARD [for] Information Technology - Telecommunications and Information Exchange Between Systems - LAN / MAN Specific Requirements - Part11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) specifications: Medium Access Control (MAC) Quality of Service (QoS) Enhancements ", January 2004

  However, when a method for making a reservation from the side requesting the band reservation to the side requesting the band reservation is used as in the wireless communication system, the communication protocol as shown in FIG. 1 is used. When IEEE802.11e is used, the bandwidth reservation request in the wireless section is limited only to the wireless slave device, and therefore there is a problem that bandwidth reservation cannot be performed directly from the wireless master device at the MAC layer level. It was. In other words, if the side requesting bandwidth reservation is the base station side, bandwidth reservation cannot be performed.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems and to make a bandwidth reservation in a pseudo manner even in a system that can reserve a bandwidth only from one direction.

  In order to solve the above problems, the invention according to claim 1 of the present patent means performs transmission / reception of data between wireless devices using wireless, and is performed by a wireless master device and one or more wireless slave devices. A wireless communication system configured, wherein the wireless master unit modulates / demodulates a baseband signal, transmits / receives data via an antenna, and a wireless band management unit that performs bandwidth management of a wireless section; Wireless base unit MAC means for performing transmission / reception processing with input / output data as packet format data, wireless base unit parameter conversion means for performing parameter conversion of transmission / reception data command, and bandwidth reservation command requesting means for requesting bandwidth reservation command for bandwidth section Wireless base unit data management means for managing data accumulation, wherein the wireless handset modulates and demodulates a baseband signal and transmits / receives data via an antenna Wireless slave device communication means, wireless slave device MAC means for performing transmission / reception processing with input / output data as packet format data, wireless slave device parameter conversion means for performing parameter conversion of transmission / reception data commands, and bandwidth reservation commands for bandwidth sections The wireless communication apparatus includes a bandwidth reservation command response unit that responds and a wireless slave unit data management unit that performs data storage management.

  According to a second aspect of the present invention, there is provided a data transmitter / receiver in which one or both of the wireless master device and the wireless slave device includes an input / output means, and is connected to one or both of the wireless master device and the wireless slave device. The wireless transmission device according to claim 1, further comprising a function of transmitting / receiving data from / to.

  The invention according to claim 3 of the present patent means is the wireless communication apparatus according to claim 1 or 2, wherein the bandwidth reservation command requesting device requests a bandwidth reservation command including a bandwidth reservation amount.

  The invention according to claim 4 of the patent means is the wireless communication apparatus according to claim 1 or 2, wherein the bandwidth reservation command requesting device requests a bandwidth reservation command including priority information.

  The invention according to claim 5 of the present patent means is the wireless communication apparatus according to claim 1 or 2, wherein the wireless master device repeatedly requests a bandwidth reservation command.

  According to the wireless communication apparatus of the present invention, the wireless slave device that has received the bandwidth reservation command performs the same procedure as the bandwidth request from the wireless slave device, that is, performs the bandwidth reservation command from the wireless slave device MAC means to the wireless master device MAC means. Even in a system in which bandwidth reservation can be made only from one direction, bandwidth reservation can be made in both directions in a pseudo manner.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 2 is a block diagram of the wireless communication apparatus according to Embodiment 1 of the present invention.

  In FIG. 2, a wireless master device 100 is a system in which a data transceiver is built in the wireless master device, that is, a wireless AV device with a built-in wireless master device, and a wireless slave device 200 has a data transceiver in the wireless slave device. System, that is, a wireless AV device with a built-in wireless slave unit.

  Here, the wireless communication protocol will be described using the procedure of IEEE802.11e.

  First, when data is transmitted from the wireless slave device 200 to the wireless master device 100, for example, the wireless slave device side is assumed to be a DVD player, and the wireless master device side is assumed to be a TV. Since the wireless slave device 200 is a DVD player, the wireless slave device data management means 206 manages the DVD content. In order to send this content to the wireless master device 100, first, MPEG data is sent to the wireless slave device parameter conversion means 204. The wireless slave unit parameter conversion unit 204 converts the parameter included in the data transmitted from the wireless slave unit data management unit 206 so as to conform to the format of the wireless packet. For example, when data based on the MPEG2-PS packet and MPEG2-TS packet formats shown in FIG. 3 is sent, the wireless slave unit parameter conversion means 204 performs format conversion suitable for the wireless frame format shown in FIG. There is a need to do. Specifically, as shown in FIG. 4 (a), a plurality of MPEG2 packets are bundled and set in the Frame Body of the wireless data frame, and the MPEG header shown in FIGS. 3 (a) and 3 (b). When the parameter corresponding to each parameter is present in the parameter of the radio management frame corresponding to FIG. 4B or FIG. 4C shown as an example, the value is converted into an appropriate value combining the unit and the like. There is a need. Here, the unit of the maximum program transmission rate which is the header of the MPEG2-PS packet shown in FIG. 3A is 50 bytes / second, but the Peak Data Rate in the TSPEC of the radio management frame shown in FIG. Since the unit of the value of 1 is 1 bit / second, it is necessary to set a value obtained by simply multiplying the value of the program maximum transmission rate by 400 in the Peak Data Rate or the like. In this way, the parameter converted by the wireless slave unit parameter conversion unit 204 is set as a value suitable for the format of the wireless frame, and data is sent to the wireless slave unit MAC unit 203. The wireless slave unit MAC unit 203 creates various management, control, or data frames as shown in part in FIG. 4 based on the parameters and data sent from the wireless slave unit parameter unit 204. It is sent to the wireless master device 100 via the communication means 201. Here, when sending data from the wireless slave device 200 to the wireless master device 100, it is necessary to secure a band in the wireless section before sending the data. It is necessary to send an ADDTS request, which is a wireless management frame, to the wireless master device 100 and issue a wireless reservation command. The wireless master device 100 receives this command via the wireless master device communication means 101, and the wireless bandwidth management means 102 that manages the bandwidth of the wireless section analyzes the parameters in the received ADDTS request, and It is determined whether or not the wireless bandwidth requested from the device 200 is smaller than the bandwidth that can be used in the current wireless section, and whether or not the bandwidth reservation is permitted is determined.

  Specifically, in the TSPEC parameter in the ADDTS request that is the radio management frame of FIG. 4B, the reserved bandwidth amount using parameters such as Nominal MSDU Size, Maximum Service Interval, Mean Data Rate, and Minimum PHY Rate. To determine whether the calculated value is smaller than the available value. As a result of the determination, the wireless master MAC unit 103 generates a wireless management frame ADDTS response shown in FIG. 4C, and notifies the wireless slave device 200 of the availability of bandwidth reservation via the wireless parent device communication unit 101. If bandwidth reservation is possible, the wireless slave device 200 transmits the data stored in the wireless slave device data management means 206 to the wireless master device 100 in a state where the wireless bandwidth is secured. The data is received via the wireless master device communication means 101, the wireless master device MAC means 103, and the wireless master device parameter conversion means 104, and is temporarily stored in the wireless master data management means 106 to display the DVD player data on the TV screen.

  This series of states is shown in FIG. First, a bandwidth reservation command is issued from the DVD player incorporating the wireless slave device 200 to the wireless slave device parameter conversion means 204 as a procedure before sending data. Upon receiving the bandwidth reservation request, the wireless slave device parameter conversion means 204 transmits an ADDTS request by the wireless slave device MAC means 203 corresponding to the MAC layer in FIG. The wireless master device 100 that has received the ADDTS request determines whether or not the requested bandwidth can be secured by the wireless bandwidth management means 102, and the result is generated by the wireless master MAC means 103 corresponding to the MAC layer in FIG. It returns to the wireless slave device 200 as an ADDTS response. When the necessary bandwidth is secured by the ADDTS response, the wireless slave device 200 transmits data to the polling signal from the wireless master device 100 corresponding to the CF-Poll signal in FIG. For management signals such as an ADDTS request, an ADDTS response, and CF-Poll, the response side sends a reply indicating that the signal has been correctly received by ACK, and performs handshaking with each other.

  On the other hand, when data is transmitted from the wireless master device 100 to the wireless slave device 200, the description will be made assuming that the wireless master device side is a DVD player and the wireless slave device side is a TV. Here, in the case of transmission from the wireless slave device 200 to the wireless master device 100, the description of the same operation is omitted. The process for sending data from the wireless slave device 200 to the wireless slave device 100 is different from that in the case of sending data from the wireless master device 100 to the wireless slave device 200. Whether it is from the machine side or from the wireless master side. However, as in the IEEE802.11e standard, when the ADDTS request, which is a wireless bandwidth request, can be performed only from the wireless slave unit side at the MAC layer level shown in FIG. Bandwidth request cannot be made. That is, the bandwidth reservation for the wireless section can be made only from one direction. Accordingly, in Claim 1 of the present invention, as shown in FIG. 2, the bandwidth reservation command request means 105 is provided in the wireless master device 100 and the bandwidth reservation command response means 205 is provided in the wireless slave device 200 to solve these problems.

  First, since the wireless master device 100 is a DVD player, the wireless parent device data management means 106 manages the DVD content. In order to send this content to the wireless slave device 200, MPEG data is sent to the wireless master device parameter conversion means 104. When the radio base unit parameter conversion unit 104 receives data from the radio base unit data management unit 106, the radio base unit parameter conversion unit 104 sends a radio unit command to the band reservation command request unit 105 in order to reserve a band necessary for sending the data. The device 200 generates a signal for controlling the bandwidth reservation to the wireless master device 100 and instructs the wireless slave device 200 to send the signal. The bandwidth reservation command requesting means 105 transmits a signal that causes the wireless slave device 200 to issue a bandwidth reservation command via the wireless master device MAC means 103 and the wireless master device communication means 101.

  The format of the bandwidth reservation command request which is the signal is shown in FIG. Thus, as shown in FIGS. 6A and 6C, the bandwidth reservation command request includes information on a transmission source address and a transmission destination address indicating from which wireless device the bandwidth reservation is made to which wireless device. At the same time, it is characterized in that it includes information on the amount of bandwidth reservation that indicates how much bandwidth reservation is necessary, or, as shown in FIGS. 6B and 6C, when bandwidth reservation or data transmission is performed, It includes the priority information for determining the priority order.

  The wireless handset 200 that has received the signal is sent to the band reservation command response means 205 via the wireless handset MAC means 203 and the wireless handset parameter conversion means 204. The bandwidth reservation command response means 205 analyzes a signal for performing a bandwidth reservation command from the wireless master device 200, obtains a necessary bandwidth amount, etc., extracts a transmission source address, a transmission destination address, or priority information, and wirelessly Appropriate parameters are passed to the slave MAC unit 203. Based on the received parameter, the wireless slave unit MAC unit 203 sets a value for the parameter of the wireless management frame ADDTS Request in FIG. 4B, and wirelessly communicates via the wireless slave unit communication unit 201 and the wireless master unit communication unit 101. A bandwidth reservation command is sent to base unit 100. The wireless bandwidth management means 102 that has received this bandwidth reservation command determines whether or not the reserved bandwidth is a currently possible bandwidth, or if bandwidth reservation is possible in consideration of the priority information value, The wireless base station MAC unit 103 generates a wireless management frame ADDTS Response in FIG. 4 (c), returns a bandwidth reservation command reply to the wireless handset 200 via the wireless base station communication unit 101, and wireless base unit MAC means. 103 communicates to the radio base unit data management unit 106 via the radio base unit parameter conversion unit 104 that the bandwidth has been secured. The radio base unit data management unit 106 transmits the stored data to the radio unit It can be transmitted to the device 200 via a wireless section whose bandwidth is secured.

  If it is impossible to secure the bandwidth, the wireless master device 100 can issue a bandwidth reservation command periodically to know when the bandwidth cannot be secured, and the information can be obtained from the wireless master device. By informing 100, for example, data stored in the wireless master device data management means 106 without being transmitted can be transmitted to the wireless slave device 200.

  This series of states is shown in FIG. First, a bandwidth reservation command is issued from the DVD player incorporating the wireless master device 100 to the wireless master device parameter conversion means 104 as a procedure before sending data. The bandwidth reservation command is generated by the bandwidth reservation command requesting means 105 of the wireless master device 100, and the wireless master device MAC means 103, the wireless master device communication means 101, the wireless slave device communication means 201 of the wireless slave device 200, and the wireless slave device. It is sent to the bandwidth reservation command response means 205 via the machine MAC means 203 and the wireless slave device parameter means 204. Upon receiving the bandwidth reservation command, the bandwidth reservation command response means 205 transmits an ADDTS request by the wireless slave device MAC means 203 corresponding to the MAC layer in FIG. The wireless master device 100 that has received the ADDTS request determines whether or not the requested bandwidth can be secured by the wireless bandwidth management means 102, and the result is generated by the wireless master MAC means 103 corresponding to the MAC layer in FIG. It returns to the wireless slave device 200 as an ADDTS response. When the necessary bandwidth is secured, wireless master device 100 transmits data simultaneously with or separately from the polling signal from wireless parent device 100 corresponding to the CF-Poll signal in FIG.

  In this way, by using the method according to the present invention for a standard or system in which a wireless zone can be reserved only from one direction, such as IEEE 802.11e, bandwidth reservation is possible in both directions, and data transmission / reception is possible. The wireless transmission system can be configured without worrying about the combination of the wireless device, the wireless master device, and the wireless slave device.

  In this embodiment, the wireless master device 100 and the wireless slave device 200 have been described as having one pair. However, a plurality of wireless slave devices may be configured for one wireless master device. . That is, it is also effective for the configuration of the wireless communication apparatus as shown in FIG.

(Embodiment 2)
FIG. 9 is a block diagram of a wireless communication apparatus according to Embodiment 2 of the present invention. In FIG. 9, the same components as those in FIG.

  In FIG. 9, the wireless master device 100 is a system connected to the data transmitter / receiver 300 by the input / output means 107, that is, the wireless master device 100 is not built in the data transmitter / receiver 300, and is installed independently. The wireless slave device 200 is a system in which the data transceiver 300 is built in the wireless slave device 200, that is, a wireless AV device with a built-in wireless slave device. Therefore, the input / output means 107 for connecting to the data transceiver 300 is newly added.

  As a configuration, the data transceiver 300 and the wireless master device 100 are independent from each other. However, the communication procedure for bandwidth reservation in the wireless master device 100 and the wireless slave device 200 has been described in the first embodiment. Since it is the same as the apparatus of FIG. 2, description is abbreviate | omitted.

  Thus, by providing the input / output means 107, it is possible to connect a data transceiver to the wireless master device 100. For example, a DVD player is connected to the wireless master device 100 with an Ethernet (R) cable, an iLink cable, or the like. This makes it possible to construct a system that is easier to use.

  In this embodiment, the input / output means 107 is provided on the wireless master device side. However, when the input / output means 107 is provided on the wireless slave device side as shown in FIG. It is possible to connect a transceiver, and, as shown in FIG. 11, when the input / output means 107 is provided on both the wireless master device side and the wireless slave device side, similarly, the wireless master device 100 and the wireless slave device are provided. It is possible to connect a data transceiver 300 to each of 200, and it is possible to create a system capable of reserving a wireless band from both directions without worrying about the installation configuration of the wireless master device 100 or the wireless slave device 200. Arise.

  Further, in this embodiment, the wireless master device 100 and the wireless slave device 200 have been described as being configured in pairs, but a plurality of wireless slave devices may be configured for one wireless master device. Absent. That is, it is also effective for the configuration of the wireless communication apparatus as shown in FIG.

  Further, as shown in FIG. 9 to FIG. 12, the input / output means 107 is connected to the wireless master device parameter converting means 104 or the wireless slave device parameter converting means 204, and compared with FIG. The management unit 106 and the wireless slave unit data management unit 206 are omitted, but the configuration may include the functions of these units.

  According to the wireless communication apparatus according to the present invention, by introducing a bandwidth reservation mechanism from a wireless base unit not defined in the IEEE802.11e standard, the AV device is built in or connected to the wireless device. Wireless data transmission can be realized from both sides, which is useful when wirelessly transmitting real-time video that requires bandwidth reservation.

Sequence diagram of bandwidth reservation method in wireless section according to IEEE 802.11e Block diagram of a wireless master device and a wireless slave device in Embodiment 1 of the present invention The figure which shows the format of the MPEG2-PS packet and MPEG2-TS packet in Embodiment 1 of this invention The figure which shows the radio | wireless data frame and radio | wireless management frame in Embodiment 1 of this invention. The figure which shows the protocol procedure of the MAC layer of a radio | wireless main | base station and a radio | wireless slave | mobile_unit, and an upper layer at the time of band reservation from the radio | wireless sub_unit | mobile_unit to Embodiment 1 of this invention The figure which shows the frame format of the band reservation command request in Embodiment 1 of this invention. The figure which shows the protocol procedure of the MAC layer of a radio | wireless main | base station and a radio | wireless slave | mobile_unit, and an upper layer at the time of band reservation from the radio | wireless main | base station in Embodiment 1 of this invention to a radio | wireless slave | mobile_unit. Block diagram of a wireless master device and a plurality of wireless slave devices in Embodiment 1 of the present invention Block diagram of a wireless master device and a wireless slave device in Embodiment 2 of the present invention Block diagram of a wireless master device and a wireless slave device in Embodiment 2 of the present invention Block diagram of a wireless master device and a wireless slave device in Embodiment 2 of the present invention Block diagram of a wireless master device and a plurality of wireless slave devices in Embodiment 2 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Radio | wireless parent | base station 101 Radio | wireless parent | base station communication means 102 Radio | wireless band management means 103 Radio | wireless parent | base station MAC means 104 Radio | wireless parent | mobile_unit parameter conversion means 105 Band reservation command request | requirement means 106 Radio | wireless parent | base_device data management means 107 Input / output means 200 Wireless | radio_device 201 Wireless handset communication means 203 Wireless handset MAC means 204 Wireless handset parameter conversion means 205 Band reservation command response means 206 Wireless handset data management means 300 Data transceiver

Claims (5)

A wireless communication system that performs transmission / reception of data between wireless devices using wireless, and is configured by a wireless master device and one or more wireless slave devices,
The wireless master unit modulates / demodulates a baseband signal and transmits / receives data via an antenna;
A wireless bandwidth management means for performing bandwidth management of the wireless section;
Wireless master MAC means for performing transmission / reception processing with input / output data as packet format data;
Radio master unit parameter conversion means for performing parameter conversion of transmission / reception data commands;
A bandwidth reservation command request means for requesting a bandwidth reservation command for a bandwidth section;
Wireless master unit data management means for data storage management,
The wireless slave unit modulates / demodulates a baseband signal and transmits / receives data via an antenna; and
Wireless handset MAC means for performing transmission / reception processing with input / output data as packet format data;
Wireless slave unit parameter conversion means for performing parameter conversion of transmission / reception data commands;
A bandwidth reservation command response means for responding to a bandwidth reservation command for the bandwidth section;
Wireless slave unit data management means for managing data accumulation,
A wireless communication apparatus characterized in that, even in a system capable of securing a bandwidth in only one direction from a wireless slave device to a wireless master device, bandwidth reservation can be performed from both directions of the wireless master device and the wireless slave device. One or both of the wireless master device and the wireless slave device are provided with input / output means, and have a function of transmitting and receiving data from a data transceiver connected to one or both of the wireless master device and the wireless slave device, The wireless communication apparatus according to claim 1. The wireless communication apparatus according to claim 1, wherein the bandwidth reservation command requesting unit requests a bandwidth reservation command including a bandwidth reservation amount. The wireless communication apparatus according to claim 1, wherein the bandwidth reservation command requesting unit requests a bandwidth reservation command including priority information. The wireless communication apparatus according to claim 1, wherein the wireless master device repeatedly requests a bandwidth reservation command.

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