JP2009081555A - Radio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio system discriminating a terminal station having high priority, based on a predetermined index, and allocating a band to the discriminated terminal station preferentially to other terminal stations. <P>SOLUTION: When a base station 11 transmits data to a plurality of terminal stations 12-14, time slots of a band are allocated to a downstream link so that the authorized terminal station 12 receives or transmits more data than the other terminal stations 13, 14, and then, the data are transmitted. For the length of each time slot to be allocated, a long time slot is allocated to the authorized terminal station 12 and a time slot shorter than that of the authorized terminal station 12 is allocated to the other terminal stations. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless system including a base station and a plurality of terminal stations, and more particularly to a wireless system that allocates a large number of bands to terminal stations with high priority in a wireless LAN, for example.

  Bandwidth allocation has been performed conventionally. For example, IEEE1394 (Technical Review, Introductory IEEE1394 Standard, pp76-78) for wired communication, ARIB STD-T74 (Wireless Equipment Standard for Specified Low Power Wireless Station Millimeter Wave Data Transmission: Chapter 6 Data Link) There are methods as shown in (Layer). This can be broadly classified into two types: asynchronous transfer for applications where real-time performance is important at a fixed rate, such as video and audio, and isochronous transfer for applications where delay is allowed but quality is to be ensured, such as file transfer. First, the communication band is allocated to asynchronous transfer that requires a fixed band, and the surplus band is allocated to isochronous transfer. As a result, isochronous transfer can be guaranteed and an asynchronous band can be dynamically allocated according to the amount of communication.

Furthermore, the upstream transmission of the transmission rate information is not required, and the frequency band is effectively used, and when there is not enough radio band allocation for the request, cell discard in the slave station side transmission buffer is avoided. There is a radio band control device (see, for example, Patent Document 1).
In addition, there is a method of assigning a different band by wireless communication for each application performed in ATM (for example, see Patent Document 2).
There is also a wireless band wired allocation method that prioritizes TCP applications (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 10-233774 JP 2000-078146 A JP 2001-320411 A

  The above-described conventional technology performs communication bandwidth allocation in accordance with the application, and is born from the viewpoint that the communication traffic is relatively large compared to the communication bandwidth and the restricted bandwidth is efficiently used. . For example, when traffic that requires real-time characteristics such as video transmission in a limited band and traffic that allows delays such as file transfer are transferred simultaneously, the traffic that requires real-time characteristics is stabilized first. In order to operate, the communication band is assigned fixedly and preferentially to the traffic that allows a delay in the excess communication band.

  However, with the advancement of technology, the wireless transmission speed is extended from several hundred mega to gigabit class. For this reason, it is possible to sufficiently widen the communication band for transmitting the communication traffic. In a situation where such a communication band is sufficient, it is not necessary to preferentially allocate the traffic having the real-time property as described above. In this way, a situation has arisen where bandwidth allocation by conventional applications is not universal.

  Here, when considering not the application level but the entire wireless system, in conventional wireless systems such as mobile phones and wireless LANs, if all terminal stations have the same propagation conditions, bands are basically allocated equally. However, in a wireless system, there are terminal stations with high priority of traffic to be handled and terminal stations with low priority. When the priorities are classified according to a certain index and bandwidth allocation is performed according to the classification, there is a problem that the conventional bandwidth allocation method using an application cannot be applied at all.

  The radio system according to the present invention is a radio system composed of a base station and a plurality of terminal stations. When a base station communicates with a plurality of terminal stations, the terminal station has a higher priority than other terminal stations. More bandwidth is allocated.

  According to the present invention, when communicating with a plurality of terminal stations, a higher priority terminal station is assigned a higher bandwidth than other terminal stations. Compared to other terminal stations, it is possible to perform more and immediately.

Hereinafter, description will be made by applying the wireless system of the present invention to a wireless LAN.
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a wireless LAN showing Embodiment 1 of the present invention, and FIG. 2 is an uplink and downlink data diagram showing bandwidth allocation status.

  The wireless LAN shown in FIG. 1 includes a base station 11 and a plurality of terminal stations 12, 13, and 14. Transmission and reception timings of the terminal stations 12, 13, and 14 are set according to instructions from the base station 11. Central control type. Between the base station 11 and the plurality of terminal stations 12, 13, 14, a downlink (line from the base station 11 to the plurality of terminal stations 12, 13, 14) and an uplink (a plurality of terminal stations 12, 13, 14, Data is transmitted / received by an FDD (frequency division duplex) method in which the frequency is divided by a line from 14 to the base station 11. With this FDD scheme, downlink and uplink communications can be performed at the same time.

  Among the plurality of terminal stations 12, 13, and 14, for example, the terminal station 12 has a function of exchanging a key (password) for authentication with the base station 11. For example, when the terminal station 12 issues an authentication request to the base station 11 for uplink establishment, the base station 11 generates and returns random data in response thereto. The terminal station 12 encrypts the received random data with a key and transmits it to the base station 11. The base station 11 encrypts the previously transmitted random data with the key of the pre-registered terminal station 12, compares it with the received encrypted data, and has a high priority when the two match. The terminal station 12 is authenticated.

  Other authentication methods include, for example, “IEEE802.15.4, wireless secret key sharing system using ESPAR antenna” (The Institute of Electronics, Information and Communication Engineers Journal B Vol.J88-B No.9 pp.1801-1812). As shown, a key generation method using a spatial propagation path may be applied, or an authentication method using an ID card or a fingerprint may be used.

  Due to the above-described authentication, the terminal station 12 is treated as performing high-priority work on this system, and the other terminal stations 13 and 14 are treated as general purpose. That is, when the base station 11 transmits data to the plurality of terminal stations 12 to 14, the authenticated terminal station 12 can receive and transmit more data than the other terminal stations 13 and 14 in the downlink. Transmission is performed by assigning a band, that is, a time slot. The length of the time slot to be allocated is long for the authenticated terminal station 12, and a time slot shorter than the authenticated terminal station 12 is allocated to the other terminal stations.

Next, the operation of the first embodiment will be described with reference to FIG. In the following description, it is assumed that authentication of the terminal station 12 has been completed.
As described above, when the base station 11 transmits data to each of the terminal stations 12 to 14, a band (time slot) is allocated to each downlink with priority being given to the authenticated terminal station 12, and data is input to each time slot. . Then, as shown in FIG. 2A, the control data 21 is sent at the head, and data 22 for the authenticated terminal station 12 and data 23 and 24 for the general terminal stations 13 and 14 are transmitted. The control data 21 at the head of this transmission signal is received by all terminal stations on this system and indicates the timing of transmission and reception. The downlink data 22 for the authenticated terminal station 12 is longer than the data 23 and 24 for the general terminal stations 13 and 14. In this way, it becomes possible to preferentially allocate the downlink band to the authenticated terminal station 12.

  On the other hand, when each terminal station 12-14 transmits data, it writes data according to the allocation of the bandwidth (time slot) in the uplink written in the control data 21 at the time of reception, and based on the transmission timing Send data. In this case, as shown in FIG. 2 (b), the authenticated terminal station 12 first transmits data 25 according to the transmission timing, then the general terminal station 13 transmits data 26, and finally the terminal station. 14 transmits data 27. The length of the data 25 transmitted from the authenticated terminal station 12 is assigned longer than the general terminal stations 13 and 14.

  As described above, according to the first embodiment, the terminal station 12 that performs a high-priority task in the wireless LAN system performs authentication with the base station 11 and performs the authentication. Since the bandwidth is allocated so that a larger amount of data can be transmitted / received preferentially than the general terminal stations 13 and 14, data transmission / reception by the authenticated terminal station 12 and the general terminal stations 13 and 14 are performed. It can be done more quickly and quickly.

  In the first embodiment, the FDD scheme that allocates different frequency bands to the downlink and uplink has been described. However, the terminal station 12 that has already been authenticated by the TDD (time division duplex) scheme that uses the same frequency is given priority. Bands may be allocated.

  In addition, the bandwidth is preferentially allocated to the authenticated terminal station 12, but the priority for the authenticated terminal station 12 is canceled when a predetermined time has elapsed or a desired job is completed. Then, the same band as that of general terminal stations 13 and 14 may be allocated.

Embodiment 2. FIG.
In the first embodiment, the bandwidth is preferentially allocated to the downlink and the uplink to the terminal station that has confirmed the authentication. However, the second embodiment has priority over the terminal station arranged at a predetermined location. A bandwidth is allocated to the system.
FIG. 3 is a configuration diagram of a wireless LAN showing the second embodiment of the present invention, and FIG. 4 is a diagram showing time slots assigned according to sectors in the wireless area.

  The wireless LAN according to the second embodiment includes a base station 31 arranged in the center of the communication area 36 and sectors A, B, C, and D of the communication area 36 divided into four around the base station 31. It comprises a plurality of terminal stations 32 to 35 arranged respectively. The terminal station 32 is arranged in the sector A, the terminal station 33 is arranged in the sector B, the terminal station 34 is arranged in the sector C, and the terminal station 35 is arranged in the sector D. When each terminal station 32 to 35 makes a communication request to the base station 31 or receives communication from the base station 31, each terminal station 32 to 35 notifies its own location (sector) and whether or not the priority is high. To the base station 31. In the second embodiment, for example, the lengths of the downlink and uplink time slots are preferentially assigned to the terminal station 32 arranged in the sector A for a long time.

Next, the operation of the second embodiment will be described with reference to FIG.
For example, when the base station 31 notifies the terminal stations 32-35 that data is to be transmitted, each terminal station 32-35 transmits sector information in response thereto, while the base station 31 receives data. Based on the information of the sector thus determined, the terminal station that performs the business with high priority is determined from among the terminal stations 32 to 35. In this case, since the terminal station 32 arranged in the sector A has priority, as shown in FIG. 4, a band (time slot) for the terminal station 32 is preferentially assigned to the downlink, and each time slot 41 to 44 is assigned. The data is put in and transmitted together with control data (not shown). The time slot 41 is for the terminal station 32 arranged in the sector A, and the time slots 42 to 44 are for the terminal stations 33 to 35 arranged in the sectors B, C and D, respectively.

  On the other hand, when each terminal station 32 to 35 transmits data, the data is written according to the length of the bandwidth (time slot) assigned to the uplink written in the control data at the time of reception, and the transmission timing is set. Send data based on. In this case, the terminal station 32 in the sector A first transmits data according to the transmission timing, then the terminal station 33 in the sector B transmits data, and then the terminal station 34 in the sector C transmits data. The terminal station 35 transmits data. The length of the data 25 transmitted from the terminal station 32 in the sector A is assigned longer than the terminal stations 13 and 14 arranged in the other sectors B to D.

  As described above, according to the second embodiment, at the time of communication, the terminal stations 32 to 35 arranged in the sectors A to D are confirmed, and other terminals are connected to the terminal station 32 arranged in the sector A. Since a band (time slot) is allocated so that a larger amount of data can be transmitted / received preferentially than the stations 33 to 35, data transmission / reception by the terminal station 32 in the sector A is more performed than the other terminal stations 33 to 35. And it can be done immediately.

  In the second embodiment, it is described that one terminal station is arranged in each of the sectors A to D. However, if a wide band is assigned to the sector to be prioritized, each sector A to D is allocated. A plurality of terminal stations may be arranged.

  Further, although the bandwidth is preferentially allocated to the terminal station 32 arranged in the sector A, the sector to which the priority is given may be changed every predetermined time.

  In the first embodiment, the priority of bandwidth allocation is determined from the confirmation of authentication, and in the second embodiment, the priority of bandwidth allocation is determined from the sector. However, the priority may be determined based on other indicators. good. For example, when the wireless system is used for a fee, or in the case of a system in which a charged terminal station and a free terminal station are mixed, the priority of band allocation may be determined using the communication cost as an index. In this case, a priority is given to a terminal station having a high communication cost.

  As an application example of the wireless system of the present invention, for example, it can be applied to a personal computer placed in an office. For example, a PC that performs important work in an office can perform operations quickly by performing authentication with a base station on the system and preferentially allocating bandwidth when communicating. .

It is a block diagram of the wireless LAN which shows Embodiment 1 of this invention. It is a data diagram of the uplink and downlink which show the allocation condition of a zone | band. It is a block diagram of the wireless LAN which shows Embodiment 2 of this invention. It is a figure which shows the time slot allocated according to the sector of the radio | wireless area.

Explanation of symbols

  11 base station, 12-14 terminal station, 21 control data, 22-24 downlink data, 25-27 uplink data, 31 base station, 32-35 terminal station, 36 radio area, AD radio area Sector, 41-44 time slots.

Claims (4)

In a wireless system composed of a base station and a plurality of terminal stations,
The base station, when communicating with a plurality of terminal stations, assigns more bandwidth to terminal stations with higher priority than other terminal stations.   The radio system according to claim 1, wherein the base station determines priority according to authentication confirmation with a terminal station.   The radio system according to claim 1, wherein the base station determines priority according to a place where the terminal station is arranged.   The radio system according to claim 1, wherein the base station determines the priority according to a communication cost of the terminal station.

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