WO2010099655A1

WO2010099655A1 - Method and apparatus for wimax subscriber station accessing wimax system

Info

Publication number: WO2010099655A1
Application number: PCT/CN2009/070625
Authority: WO
Inventors: 邱吉刚; 杨峰; 徐斌阳
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯公司
Priority date: 2009-03-03
Filing date: 2009-03-03
Publication date: 2010-09-10
Also published as: CN102342063A; CN102342063B

Abstract

A method for a World Interoperability for Microwave Access (WiMAX) subscriber station (SS) accessing a WiMAX system is provided in the present invention, wherein the WiMAX system coexists with at least one WireIess Local Area Network (WLAN) system in License-Exempt (LE) frequency bands and the WiMAX SS is capable of operating in a WiMAX or WLAN mode. The method includes the following steps: the WiMAX SS accesses a WiMAX Base Station (BS); the WiMAX SS determines whether it is located in the coverage range of a WLAN system within at least one WLAN system or not; a connection is set up between the WiMAX BS and an Access Point (AP) of the WLAN system in which the WiMAX SS is located; the WiMAX SS accesses the AP; service payloads between the WiMAX SS and BS are are transmitted through the AP. The method improves the spectrum efficiency of LE frequency bands effectively and provides high security for data transmission. A WiMAX SS, WiMAX BS and AP of a WLAN system are also provided in the present invention.

Description

Method for connecting WiMAX subscriber station to WiMAX system and corresponding device

Technical field

The present invention relates to a technology for a WiMAX system and a wireless local area network (WLAN) system coexisting in an unlicensed frequency band, and more particularly to a method for a WiMAX subscriber station to access a WiMAX system in the case where a WiMAX system and a WLAN system coexist in an unlicensed frequency band Corresponding WiMAX subscriber stations, WiMAX base stations, and access point equipment for WLAN systems. Background technique

With the development of mobile communication technologies and broadband wireless technologies, WiMAX (Worldwide Interoperability for Microwave Access) has become one of the hotspots of telecom operators and equipment manufacturers worldwide. WiMAX is a broadband wireless access technology based on the IEEE802.16 series of standards. It has the characteristics of long transmission distance, high access speed and high security.

For broadband wireless access technology, in addition to seeking more advanced physical layer technologies, including multiple input multiple output (MIMO), beamforming, adaptive modulation coding (AMC), etc., researchers have recently paid more and more attention to frequency sharing technology. Especially in the unlicensed band, the frequency sharing technology allows many wireless systems to coexist to improve the frequency usage. Therefore, considering the huge potential of spectrum sharing technology to solve the current shortage of available frequencies, IEEE 802.16h is developing technical specifications and mechanisms to ensure the coexistence of WiMAX systems and other wireless systems on unlicensed bands.

It is well known that wireless systems with different physical layer technologies can operate simultaneously on the same frequency band due to the non-exclusive nature of the unlicensed band. For example, wireless devices such as WLAN systems, Bluetooth devices, and cordless phones based on the IEEE 802.il standard can operate in the 2.4 GHz band without the permission of the relevant regulatory agencies, resulting in related interference between these devices. Considering the widespread use of WLAN equipment, it is important to study the coexistence of WiMAX systems and WLAN systems in unlicensed bands, such as the 2.4 GHz band, the Unlicensed National Information Infrastructure (U-NII) band.

Currently, 802.16h proposes a carrier-based multiple access/collision avoidance The (CSMA/CA) protocol (also known as the "listen before" protocol) ensures that WiMAX systems and WLAN systems can coexist on unlicensed bands. According to the protocol, the uplink and downlink subframes can be logically regarded as a single packet having a fixed duration, the fixed duration being equal to the single frame duration.

The subscriber stations of the WiMAX system and the WLAN system employ a carrier detection mechanism to listen to the idle channel. If the signal power of the current channel is detected to be greater than a predetermined threshold, the wireless channel is considered to be in use by other devices, i.e., in a "busy" state; otherwise, the wireless channel is considered to be idle and can initiate its own transmission. In this case, the subscriber stations and base stations of the WiMAX system are similar to the subscriber stations of the WLAN system, accessing the channel in accordance with the procedures specified by the 802.11 standard.

However, since the WiMAX system's coverage (0-50 km) is much larger than the WLAN system's coverage (0-100 m), it can contain multiple (or even hundreds) WLANs within the coverage of a WiMAX system. system. If the CSMA/CA protocol described above is used, all WLAN systems located within the coverage of the WiMAX system must be suspended during transmission/reception of the WiMAX system. In other words, a WiMAX communication link will stop multiple WLAN communication links.

FIG. 1 shows a case where a WiMAX system and a plurality of WLAN systems in the related art coexist. 1, there are fields 10 corresponding WLANl-WLAN10 _o WLAN system in CSMA / CA protocol, WiMAX systems and WLAN systems are transmitted by the message transmission time slot is declared, in the coverage of the WiMAX system ( That is, the channel occupancy time is T1 and T2. Then, during T1, the WiMAX base station transmits/receives uplink and downlink subframes with its WiMAX subscriber station, and the access point equipment and WLAN subscriber stations of all WLAN systems will suspend their transmission until T1 ends. During T2, the WiMAX base station and its corresponding subscriber station will stop transmitting/receiving subframes, and the access point devices and WLAN subscriber stations of all WLAN systems simultaneously transmit/receive packets without interfering with each other.

Since the data rate of the WLAN link (54 Mbps, 802.1 lg/a) is roughly equivalent to the data rate of the WiMAX link (typically 20 Mbps), if the WiMAX system can reduce its channel occupancy time, the saved channel time can be 10 WLAN systems are used simultaneously, which can significantly improve the efficiency of spectrum usage. The existing CSMA/CA protocol does not consider the difference in coverage between WiMAX systems and WLAN systems, and cannot effectively benefit Use the channel. Summary of the invention

The present invention has been made based on the above technical problems, and an object thereof is to provide a method for a WiMAX subscriber station to access a WiMAX system, so as to improve spectrum efficiency. In addition, the present invention also provides corresponding WiMAX subscriber stations, WiMAX base stations, and access point equipment for WLAN systems.

According to a first aspect of the present invention, a method for a WiMAX subscriber station to access a WiMAX system is provided, wherein the WiMAX system and at least one WLAN system coexist on an unlicensed frequency band, and the WiMAX subscriber station can alternatively be in WiMAX Working in a mode and a WLAN mode, the method comprising: the WiMAX subscriber station accessing a WiMAX base station; the WiMAX subscriber station determining whether it is located within a coverage of a WLAN system of the at least one WLAN system; Establishing a connection between the WiMAX base station and an access point device of the WLAN system in which the WiMAX subscriber station is located; the WiMAX subscriber station accessing the access point device; and the WiMAX subscriber station via the access point device Transmitting a traffic load with the WiMAX base station.

According to a second aspect of the present invention, there is provided a WiMAX subscriber station that is selectively operable in a WiMAX mode and a WLAN mode, comprising: a transceiver for transmitting and receiving signals; a WiMAX access device, for Accessing a WiMAX base station; a location determining device, configured to determine whether the WiMAX subscriber station is located within a coverage of a WLAN system; a WLAN access device, an access point device for accessing the WLAN system; And a decryption device, configured to encrypt and decrypt a traffic load transmitted between the WiMAX subscriber station and the access point device or the WiMAX base station.

According to a third aspect of the present invention, a WiMAX base station is provided, comprising: transceiver means for transmitting and receiving signals; and management control information broadcasting means for broadcasting management control information messages to establish a downlink with a WiMAX subscriber station Synchronizing means for authenticating the WiMAX subscriber station; and key exchange means for exchanging WiMAX keys for encrypting traffic load in the WiMAX system with the WiMAX subscriber station; set up And a device, configured to establish a connection with an access point device of the WLAN system; and an encryption and decryption device, configured to perform a traffic load transmitted between the WiMAX base station and the access point device or the WiMAX subscriber station Add and decrypt.

According to a fourth aspect of the present invention, an access point device of a WLAN system is provided, comprising: a transceiver for transmitting and receiving signals; an authentication device for authenticating a WiMAX subscriber station; and a key exchange device And a WLAN key for encrypting a traffic load in the WLAN system; a connection establishing means for establishing a connection with the WiMAX base station; and an encryption and decryption means for the device at the access point and the The traffic load transmitted between the WiMAX subscriber station and the WiMAX base station is encrypted and decrypted. DRAWINGS

1 is a schematic diagram of a coexistence of a WiMAX system and a plurality of WLAN systems in the prior art; FIG. 2 is a flowchart of a method for a WiMAX subscriber station to access a WiMAX system according to an embodiment of the present invention;

3 is a flow chart showing the steps of the WiMAX subscriber station accessing the WiMAX base station in the embodiment shown in FIG. 2;

4 is a flow chart showing the steps of transmitting a traffic load between a wireless WiMAX subscriber station and a WiMAX base station via a WLAN system in the embodiment shown in FIG. 2;

5 is a schematic diagram of a method of using the embodiment shown in FIG. 2 in the case where a WiMAX system and a plurality of WLAN systems coexist;

Figure 6 is a schematic block diagram of a WiMAX subscriber station in accordance with one embodiment of the present invention; Figure 7 is a schematic block diagram of a WiMAX base station in accordance with one embodiment of the present invention; Figure 8 is a WLAN system in accordance with one embodiment of the present invention. Schematic block diagram of an access point device. detailed description

The above and other objects, features and advantages of the present invention will become more apparent from 2 is a flow diagram of a method of a WiMAX subscriber station accessing a WiMAX system in accordance with one embodiment of the present invention. The present embodiment will be described in detail below with reference to the accompanying drawings.

In this embodiment, the WiMAX system and multiple WLAN systems coexist on the unlicensed band. Since WiMAX systems and WLAN systems use similar physical layer technologies, namely Orthogonal Frequency Division Multiplexing (OFDM)-based air interface technology, WiMAX subscriber stations of WiMAX systems can be selectively modified in WiMAX mode and WLAN by simple modification. Working in mode.

As shown in FIG. 2, in step S201, the WiMAX subscriber station accesses the WiMAX base station. In this step, the WiMAX subscriber station communicates directly with the WiMAX base station via the WiMAX radio interface, at which point the WiMAX subscriber station operates in WiMAX mode. In this embodiment, Figure 3 shows the flow of a WiMAX subscriber station accessing a WiMAX base station. As shown in FIG. 3, in step S301, the WiMAX subscriber station scans the downlink channel and establishes synchronization of the downlink channel with the WiMAX base station. Next, in step S305, the WiMAX subscriber station acquires parameters of the uplink and downlink link channel.

Then, in step 310, the WiMAX subscriber station and the WiMAX base station perform initial ranging. This step can be done by sending/receiving a ranging request/response (RNG-REQ/RNG-RSP) message. With the initial ranging operation, the WiMAX subscriber station can adjust the frequency offset, time offset and power offset.

In step S315, the WiMAX subscriber station negotiates with the WiMAX base station the basic capabilities of the WiMAX subscriber station to determine the parameters that the WiMAX subscriber station should use during subsequent communications. This step can be done by sending/receiving a basic capability request/response (SBC-REQ/SBC-RSP) message.

At step S320, the WiMAX subscriber station is authenticated and the WiMAX key is exchanged. First, the WiMAX base station and the access gateway authenticate the WiMAX subscriber station, and then, in the case of authentication, the WiMAX subscriber station sends a Key Management Request (PKM-REQ) message to the WiMAX base station, and the WiMAX base station responds to the request message to the WiMAX. The subscriber station sends a WiMAX key.

Then, in step S325, the WiMAX subscriber station registers with the WiMAX base station, which can This is done by sending/receiving a registration request/response (REG-REQ/REG-RSP) message.

During the WiMAX subscriber station's access to the WiMAX base station, the WiMAX base station increases its channel occupancy time to accommodate transmissions with WiMAX subscriber stations.

Returning to Figure 2, in step S205, the WiMAX subscriber station determines if it is within the coverage of one of the plurality of WLAN systems.

In this embodiment, the WiMAX subscriber station scans and listens to the channel in the unlicensed band, and determines whether there is a signal transmitted by the access point device of a certain WLAN system on the channel being monitored and the signal is Whether the power exceeds a predetermined power threshold. If the power of a signal from a certain WLAN system exceeds a predetermined power threshold, the WiMAX subscriber station determines that it is within the coverage of the WLAN system. Otherwise, the WiMAX subscriber station will continue to listen on the next scanned channel. If the WiMAX subscriber station does not hear a WLAN signal that exceeds a predetermined power threshold in all channels, then it is determined that it is not within the coverage of any WLAN system. After determining the WLAN system in which it is located, the WiMAX subscriber station informs the WiMAX base station that it can access the WLAN system to transmit the traffic load through the WLAN radio interface, and the information of the WLAN system, such as an IP address.

Next, in step S210, the WiMAX base station establishes an IP connection with the access point device of the WLAN system according to information, such as an IP address, of the WLAN system in which the WiMAX subscriber station is received from the WiMAX subscriber station. After the WiMAX base station establishes an IP connection with the access point device, it will reduce its occupation time of the channel.

Then, in step S215, the WiMAX subscriber station accesses the access point device of the WLAN system in which it is located. In this step, the WiMAX subscriber station uses the CSMA/CA mode to access the channel, and then the access point device authenticates the WiMAX subscriber station, and in the case of authentication, the WLAN access point device exchanges with the WiMAX subscriber station for The WLAN key of the traffic load is encrypted in the WLAN system.

Then, in step S220, the WiMAX subscriber station transmits the traffic load between the access point device of the WLAN system in which it is located and the WiMAX base station.

Figure 4 shows a flow chart of step S220, wherein Figure 4(a) is the transmission of the uplink traffic load and Figure 4(b) is the transmission of the downlink traffic load. As shown in Figure 4(a), by WiMAX The uplink traffic load sent by the subscriber station will be transmitted to the WiMAX base station via the WLAN radio interface and the IP connection between the access point device and the base station. Specifically, in step S401, the WiMAX subscriber station sequentially encrypts the uplink traffic load to be transmitted using the WiMAX key and the WLAN key, and in step S405, the encrypted uplink traffic load is performed through the WLAN radio interface. An access point device that is sent to the WLAN system. Next, in step S410, after receiving the encrypted uplink traffic load, the access point device decrypts the received uplink traffic load by using the WLAN key, and in step S415, the decrypted uplink is performed. The traffic load is forwarded to the WiMAX base station over the IP connection. Then, in step S420, the WiMAX base station decrypts the uplink traffic load from the access point device using the WiMAX key. It can be seen that the uplink traffic load transmitted through the WLAN radio interface is double-encrypted, and the uplink traffic load transmitted through the IP connection is encrypted only once.

In addition, the downlink traffic load transmitted by the WiMAX base station will be transmitted to the WiMAX subscriber station through the IP connection between the base station and the WLAN access point device and the WLAN radio interface. Specifically, as shown in FIG. 4(b), in step S430, the WiMAX base station encrypts the downlink traffic load to be transmitted using the WiMAX key, and passes the encrypted downlink traffic load through the IP in step S435. Connect to an access point device that is sent to the WLAN system. Next, in step S440, the access point device encrypts the received downlink traffic load using the WLAN key, and transmits the encrypted downlink traffic load to the WiMAX subscriber station through the WLAN wireless interface in step S445. Then, in step S450, the WiMAX subscriber station sequentially decrypts the received downlink traffic load using the WLAN key and the WiMAX key. It can be seen that, similar to the uplink traffic load, the downlink traffic load transmitted through the IP connection is encrypted only once, and the downlink traffic load transmitted through the WLAN radio interface is double-encrypted.

It can be seen from the above description that the method for accessing the WiMAX subscriber station of the WiMAX system in this embodiment can overcome the problem of low frequency and efficiency caused by different coverage of the WiMAX system and the WLAN system in the prior art, thereby effectively improving the problem. Spectrum efficiency of unlicensed bands. When the WiMAX subscriber station is located within the coverage of a WLAN system, the traffic load between the WiMAX subscriber station and the WiMAX base station can be wirelessly connected through the WLAN system. The port and the IP connection between the access point device of the WLAN system and the WiMAX base station are transmitted. Therefore, the traffic load transmitted through the WiMAX wireless interface is greatly reduced, and the channel occupation time required for WiMAX transmission is also significantly reduced, thereby saving The wireless resources can be used simultaneously by multiple WLAN systems to improve spectral efficiency. In addition, since the WiMAX subscriber station performs authentication/key exchange/registration through the WiMAX radio interface, and the uplink and downlink traffic load of the WiMAX subscriber station is encrypted by the WiMAX key, the WiMAX subscriber is compared with the conventional WLAN access method. Station has higher security

When a WiMAX subscriber station determines that it is not within the coverage of a WLAN system, the WiMAX subscriber station transmits the traffic load directly to the WiMAX base station via the WiMAX radio interface. In this case, the uplink and downlink traffic load is encrypted only once, that is, using the WiMAX key for encryption.

Figure 5 is a schematic diagram of a method of using the embodiment of Figure 2 in the case where a WiMAX system and a plurality of WLAN systems coexist. The details are described below in conjunction with the drawings.

As shown in FIG. 5, there are four WLAN systems WLAN1-WLAN4 in the coverage of one WiMAX system, and the four WLAN systems do not overlap each other, and WiMAX subscriber stations SS1-SS5 can alternatively be in WiMAX mode and WLAN mode. jobs.

WiMAX subscriber stations SS1-SS5 communicate with WiMAX base stations via WiMAX radio interfaces to perform downlink channel synchronization, uplink and downlink channel parameter acquisition, initial ranging, basic capability negotiation, authentication, key exchange and registration, etc. Network access and initialization operations. Then, by scanning the channels of the unlicensed band, WiMAX subscriber stations SS1, SS2, and SS4 determine that they are within the coverage of WLAN 1, WLAN 2, and WLAN 3, respectively, and notify the WiMAX base station. WiMAX subscriber stations SS3 and SS5 are not located within the coverage of any WLAN system.

Next, the WiMAX base station establishes an IP connection with the access point (AP) devices of WLAN 1, WLAN 2, and WLAN 3, respectively. The WiMAX subscriber stations SSI, SS2, and SS4 are switched to the WLAN mode, and respectively access the AP devices of the WLAN system in which they are located to obtain the WLAN key.

For the uplink traffic load to be sent, the WiMAX subscriber stations SS1, SS2 and SS4 are sequentially encrypted using the previously obtained WiMAX key and WLAN key, and then passed The WLAN radio interfaces are respectively sent to the AP devices of WLAN 1, WLAN 2, and WLAN 3. After receiving the uplink traffic load, each AP device decrypts using the WLAN key and forwards it to the WiMAX base station through the IP connection. The WiMAX base station decrypts using the WiMAX key for the received uplink traffic load.

For the downlink traffic load to be transmitted, for example, the downlink traffic load sent to the WiMAX subscriber station SS1, the WiMAX base station encrypts using the WiMAX key and forwards it to the AP device of the WLAN 1 through the IP connection. After receiving the downlink traffic load, the AP device encrypts using the WLAN key and sends it to the WiMAX subscriber station SSI through the WLAN radio interface. The WiMAX subscriber station SSI then sequentially decrypts the received downlink traffic load using the WLAN key and the WiMAX key.

In addition, WiMAX subscriber stations SS3 and SS5 use the WiMAX key to encrypt the uplink traffic load to be transmitted and send it directly to the WiMAX base station via the WiMAX radio interface, which then uses the WiMAX key for decryption. Similarly, the WiMAX base station encrypts the downlink traffic load using the WiMAX key and sends it to the WiMAX subscriber stations SS3 and SS5 over the WiMAX radio interface, and then the WiMAX subscriber stations SS3 and SS5 use the WiMAX key for decryption.

In the above example, the four WLAN systems do not overlap each other. The method of this embodiment is equally applicable if there are overlapping of multiple WLAN systems, wherein the WiMAX subscriber station can select the WLAN system with the best signal quality when determining the WLAN system in which it is located.

Under the same inventive concept, Figure 6 is a schematic block diagram of a WiMAX subscriber station in accordance with one embodiment of the present invention. The present embodiment will be described in detail below with reference to the drawings, and the description of the same portions as those of the previous embodiment will be appropriately omitted.

As shown in FIG. 6, the WiMAX subscriber station 600 according to the present embodiment includes: a gateway 601 for transmitting and receiving wireless signals, a WiMAX access device 602 for accessing a WiMAX base station, and a location determining device 603. For determining whether the WiMAX subscriber station is located in a WLAN system; a WLAN access device 604, an access point device for accessing the WLAN system; and an encryption and decryption device 605 for accessing the WiMAX subscriber station and the WLAN system The traffic load transmitted between the access point device or the WiMAX base station is encrypted and decrypted. When the WiMAX subscriber station 600 is to access the WiMAX system, it first accesses the WiMAX base station through the WiMAX access device 602. Specifically, in the WiMAX access device 602, the downlink synchronization unit 6021 establishes synchronization of the downlink channel through channel search. Next, the uplink and downlink parameter obtaining unit 6022 acquires parameters of the uplink and downlink channels. Then, the ranging unit 6023 performs initial ranging by transmitting a ranging request (RNG-REQ) message to the WiMAX base station and receiving a ranging response (RNG-RSP) message, and the basic capability negotiation unit 6024 transmits/receives the basic capability request/ The acknowledgment (SBC-REQ/SBC-RSP) message is used to negotiate basic capabilities with the WiMAX base station. Next, the authentication and key exchange unit 6025 authenticates the WiMAX subscriber station 600 with the WiMAX base station and acquires the WiMAX key. The authenticated WiMAX subscriber station 600 registers with the base station via registration unit 6026. Thus, WiMAX subscriber station 600 enables access to WiMAX base stations.

The WiMAX subscriber station 600 then determines by location determining device 603 whether it is within a certain WLAN. In the location determining means 603, channel scanning and interception are first performed by the channel scanning and listening unit, and then the power judging unit judges whether there is a signal transmitted by the access point device of a certain WLAN system on the channel being monitored. And whether the power of the signal exceeds a predetermined power threshold. When the power judging unit judges that the power of the signal from the access point device of a certain WLAN system exceeds a predetermined power threshold, the location determining unit determines that the WiMAX subscriber station 600 is located within the coverage of the WLAN system. Then, the notification unit notifies the WiMAX base station that the WiMAX subscriber station 600 can access the WLAN system and the information of the WLAN system. If the power of the signal from the access point device on the scanned channel is less than the predetermined power threshold, the location determining unit determines that the WiMAX subscriber station 600 is not within the coverage of any WLA system.

After the location determining device 603 determines that the WiMAX subscriber station 600 is located within a certain WLAN system, the WiMAX subscriber station 600 accesses the access point device of the WLAN system via the WLAN access device 604. In the WLAN access device 604, the channel scanning unit 6041 detects whether the channel is idle and accesses the idle channel using the CSMA/CA mechanism. Next, the WLAN authentication unit 6042 authenticates the WiMAX subscriber station 600 with the access point device, and the WLAN key exchange unit 6043 exchanges the WLAN key with the access point device. Then, the user station 600 WiMAX encryption and decryption by the transmitted traffic load for encryption and decryption apparatus 605, and the traffic load transmission through the transceiver ⁶⁰¹ and the WiMAX access point or base station.

When the WiMAX subscriber station 600 is determined to be within the coverage of a certain WLAN system, in the encryption and decryption device 605, the encryption unit 6051 sequentially doubles the uplink traffic load to be transmitted using the WiMAX key and the WLAN key. Encrypted, then transmitted by the transceiver 601 to the access point device of the WLAN system for the double encrypted uplink traffic load; for the downlink traffic load received by the transceiver 601 from the access point device, the decryption unit The 6052 uses the WLAN key and the WiMAX key to decrypt it sequentially.

When the WiMAX subscriber station 600 is determined not to be located in any WLAN system, in the encryption and decryption device 605, the encryption unit 6051 encrypts only the uplink traffic load to be transmitted using the WiMAX key, and then the transceiver 601 transmits the single-encrypted uplink traffic load to the WiMAX base station; for the downlink traffic load from the WiMAX base station, the decryption unit 6052 decrypts using only the WiMAX key.

Under the same inventive concept, Figure 7 is a schematic block diagram of a WiMAX base station in accordance with one embodiment of the present invention. The present embodiment will be described in detail below with reference to the accompanying drawings, wherein the description of the same portions as those of the previous embodiment will be appropriately omitted.

As shown in FIG. 7, the WiMAX base station 700 according to this embodiment includes: a transceiver 701 for transmitting and receiving signals; and a management control information broadcasting device 702 for transmitting a downlink allocation map (Downlink MAP, DLMAP for short) And a control channel information message such as a Downlink Channel Descriptor (DCD) to establish a synchronization of the downlink channel with the WiMAX subscriber station; an authentication and key exchange apparatus 703 for the WiMAX subscriber station Authenticating and exchanging WiMAX keys for encrypting traffic load; connection establishing means 704 for establishing a connection with an access point device of the WLAN system; and encryption and decryption means 705 for pairing the WiMAX base station and the access point device Or the traffic load transmitted between WiMAX subscriber stations is encrypted and decrypted.

In the present embodiment, the base station 700 controls the management of the WiMAX subscriber station access by the management control information broadcast device 702, the authentication and key exchange device 703, and is based on the use of WiMAX. The subscriber station's notification that the WiMAX subscriber station is able to access the WLAN system in which it is located and the information of the WLAN system establishes an IP connection with the access point device of the WLAN system via the connection establishing device 704. Then, the transmitted traffic load is encrypted and decrypted by the encryption/decryption device 705.

In the encryption and decryption device 705, the encryption unit 7051 encrypts the downlink traffic load to be transmitted using the WiMAX key, and the transceiver 701 transmits the encrypted downlink traffic load to the access point through the IP connection (if present). The device, or directly sent to the WiMAX subscriber station (if the above IP connection does not exist); the decryption unit 7052 then uses the WiMAX key to perform the uplink traffic load from the access point device or the WiMAX subscriber station received by the transceiver 701. Decrypt.

Under the same inventive concept, FIG. 8 is a schematic block diagram of an access point device of a WLAN system according to an embodiment of the present invention. The present embodiment will be described in detail below with reference to the drawings, and the description of the same portions as those of the previous embodiment will be appropriately omitted.

As shown in FIG. 8, the access point device 800 according to this embodiment includes: a transceiver 801 for transmitting and receiving wireless signals; and an authentication device 802 for authenticating a WiMAX subscriber station by using a WLAN authentication mechanism; Apparatus 803, configured to exchange a WLAN key for encrypting a traffic load in a WLAN system; connection establishing means 804 for establishing a connection with a WiMAX base station; and encryption and decryption means 805 for pairing the access point device and the WiMAX user The traffic load transmitted between the station and the WiMAX base station is encrypted and decrypted.

In the present embodiment, the access point device 800 establishes an IP connection with the WiMAX base station through the connection establishing means 804. When a WiMAX subscriber station wants to access the access point device 800 of the WLAN system, the access point device 800 completes the access of the WiMAX subscriber station through the authentication device 802 and the key exchange device 803. Then, the access point device 800 encrypts and decrypts the transmitted traffic load through the encryption and decryption device 805. In the encryption/decryption device 805, for the downlink traffic load received by the transceiver device 801 from the base station, the encryption unit 8051 encrypts using the WLAN key, and the encrypted downlink traffic load is transmitted by the transceiver 801 to the WiMAX subscriber station. For the uplink traffic load received from the WiMAX subscriber station, the decryption unit 8052 decrypts using the WLAN key and transmits the decrypted uplink traffic load to the WiMAX base. Station.

It should be noted that the WiMAX subscriber station, the WiMAX base station, the access point device of the WLAN system and various components thereof of the above embodiments may be composed of a semiconductor such as a very large scale integrated circuit or gate array, such as a logic chip, a transistor, or the like, or such as a field. The hardware circuit implementation of the programmable hardware device for programming the gate array, the programmable logic device, and the like can also be implemented by software executed by various types of processors, or by a combination of the above hardware circuits and software.

Although the WiMAX subscriber station access method of the WiMAX system, the WiMAX subscriber station, the WiMAX base station, and the access point equipment of the WLAN system of the present invention are described in detail by some exemplary embodiments, the above embodiments are not exhaustive. Various changes and modifications can be made by those skilled in the art within the spirit and scope of the invention. Therefore, the invention is not limited by the embodiments, and the scope of the invention is limited only by the appended claims.

Claims

Rights request

A method for a WiMAX subscriber station to access a WiMAX system, wherein the WiMAX system and at least one WLAN system coexist on an unlicensed frequency band, and the WiMAX subscriber station can selectively operate in a WiMAX mode and a WLAN mode. The methods include:

The WiMAX subscriber station accesses a WiMAX base station;

The WiMAX subscriber station determines that it is located within the coverage of a certain WLAN system in the at least one WLAN system;

Establishing a connection between the WiMAX base station and an access point device of the WLAN system in which the WiMAX subscriber station is located;

The WiMAX subscriber station accesses the access point device;

The WiMAX subscriber station transmits a traffic load between the WiMAX base station and the WiMAX base station.

2. The method according to claim 1, wherein the step of the WiMAX subscriber station accessing the WiMAX base station comprises:

The WiMAX subscriber station scans a downlink channel and establishes synchronization of a downlink channel with the WiMAX base station;

The WiMAX subscriber station acquires parameters of an uplink and downlink channel;

The WiMAX subscriber station performs initial ranging;

Negotiating the basic capabilities of the WiMAX subscriber station with the WiMAX base station;

Authenticating with the WiMAX base station and exchanging WiMAX keys for encrypting traffic load in the WiMAX system;

Registering with the WiMAX base station.

The method according to claim 1 or 2, wherein the step of determining, by the WiMAX subscriber station, that it is located in a coverage of a WLAN system in the at least one WLAN system comprises:

Scanning and listening for channels in the unlicensed band;

Determining whether there is a signal sent by the access point device of a certain WLAN system on the channel being monitored and whether the power of the signal exceeds a predetermined power threshold; Determining that the WiMAX subscriber station is located within the WLAN system if power of the signal from an access point device of a WLAN system exceeds the predetermined power threshold; and notifying the WiMAX base station that the WiMAX subscriber station Accessibility of the WLAN system and information of the WLAN system.

4. The method according to claim 2, wherein the step of the WiMAX subscriber station accessing the access point device comprises:

The WiMAX subscriber station detects whether a channel in the unlicensed band is idle and accesses a free channel;

Authenticating the WiMAX subscriber station; and exchanging WLAN keys for encrypting traffic load in the WLAN system.

5. The method according to claim 4, wherein the step of transmitting, by the WiMAX subscriber station, the traffic load to the WiMAX base station via the access point device comprises:

For uplink traffic load,

The WiMAX subscriber station sequentially encrypts the uplink traffic load using the WiMAX key and the WLAN key, and transmits the encrypted uplink traffic load to the access point device;

The access point device decrypts the received uplink traffic load using the WLAN key and forwards the decrypted uplink traffic load to the WiMAX base station;

The WiMAX base station decrypts the received uplink traffic load using the WiMAX key;

For downlink traffic load,

The WiMAX base station encrypts the downlink traffic load using the WiMAX key, and transmits the encrypted downlink traffic load to the access point device; the access point device uses the WLAN The key encrypts the received downlink traffic load and transmits the encrypted downlink traffic load to the WiMAX subscriber station;

The WiMAX subscriber station uses the WLAN key and the WiMAX key Sequence: The received downlink traffic load is decrypted.

6. The method of claim 1 further comprising:

The WiMAX subscriber station determines that it is not located in a certain WLAN system in the at least one WLAN system;

7. A WiMAX subscriber station that can optionally operate in WiMAX mode and WLAN mode, including:

a transceiver for transmitting and receiving wireless signals;

WiMAX access device for accessing a WiMAX base station;

a location determining device, configured to determine whether the WiMAX subscriber station is located in a WLAN system;

a WLAN access device, an access point device for accessing the WLAN system; and an encryption and decryption device, configured to transmit a service between the WiMAX subscriber station and the access point device or the WiMAX base station The load is encrypted and decrypted.

8. The WiMAX subscriber station according to claim 7, wherein the WiMAX access device comprises:

a downlink synchronization unit, configured to establish synchronization of a downlink channel with the base station;

An uplink and downlink parameter obtaining unit, configured to acquire parameters of an uplink and downlink channel;

a ranging unit for performing initial ranging;

a basic capability negotiation unit, configured to negotiate with the WiMAX base station the basic capabilities of the WiMAX subscriber station;

An authentication and key exchange unit for authenticating the WiMAX subscriber station and exchanging with the WiMAX base station a WiMAX key for encrypting a traffic load in the WiMAX system;

a registration unit, configured to register with the WiMAX base station.

9. The WiMAX subscriber station according to claim 7 or 8, wherein the location determining apparatus comprises:

a channel scanning and listening unit for scanning and listening to a channel; a power determining unit, configured to determine whether a signal sent by an access point device of a certain WLAN system exists on the channel being monitored, and whether the power of the signal exceeds a predetermined power threshold;

a location determining unit, configured to determine, when the power determining unit determines that the power of an access point device from a WLAN system exceeds the predetermined power threshold, that the WiMAX subscriber station is located within a coverage of the WLAN system; as well as

And a notification unit, configured to notify the WiMAX base station of the WiMAX subscriber station accessibility to the WLAN system and information about the WLAN system.

The WiMAX subscriber station according to claim 8, wherein the WLAN access device comprises:

a channel access unit, configured to detect whether a channel is idle and access an idle channel;

a WLAN authentication unit, configured to authenticate the WiMAX subscriber station to the access point device;

A WLAN key exchange unit is configured to exchange a WLAN key for encrypting a traffic load in the WLAN system.

The WiMAX subscriber station according to claim 8, wherein the encryption and decryption apparatus comprises:

And an encryption unit, configured to double-encrypt the uplink traffic load to be sent sequentially by using the WiMAX key and the WLAN key, or use only the WiMAX key pair to perform an uplink traffic load to be sent Single encryption;

a decryption unit, configured to sequentially decrypt a downlink traffic load from the access point device using the WLAN key and the WiMAX key, or use only the WiMAX key pair from the WiMAX base station The downlink traffic load is decrypted; wherein the server sends a double-encrypted uplink traffic load to the access point device, and sends a single encrypted uplink traffic load to the WiMAX base station, And receiving a downlink traffic load from the access point device or the WiMAX base station.

12. A WiMAX base station, including:

a transceiver device for transmitting and receiving signals;

Management control information broadcast device for broadcasting management control information messages to be associated with WiMAX The subscriber station establishes synchronization of the downlink channel;

An authentication and key exchange device for authenticating the WiMAX subscriber station and exchanging with the WiMAX subscriber station a WiMAX key for encrypting a traffic load in the WiMAX system;

a connection establishing device, configured to establish a connection with an access point device of the WLAN system; and an encryption and decryption device, configured to perform a traffic load transmitted between the WiMAX base station and the access point device or the WiMAX subscriber station Add and decrypt.

The base station according to claim 12, wherein the encryption and decryption apparatus comprises: an encryption unit configured to encrypt a downlink traffic load to be transmitted using the WiMAX key;

a decryption unit, configured to decrypt the received uplink traffic load by using the WiMAX key;

The transceiver device transmits the encrypted downlink traffic load to the access point device or the WiMAX subscriber station, and receives an uplink traffic load from the access point device or the WiMAX subscriber station.

14. An access point device for a WLAN system, comprising:

a transceiver device for transmitting and receiving signals;

An authentication device for authenticating a WiMAX subscriber station;

a key exchange device, configured to exchange a WLAN key for encrypting a traffic load in the WLAN system;

a connection establishing device for establishing a connection with a WiMAX base station;

And an encryption and decryption device, configured to encrypt and decrypt a traffic load transmitted between the access point device and the WiMAX subscriber station and the WiMAX base station.

The access point device according to claim 14, wherein the encryption and decryption device comprises: an encryption unit, configured to encrypt a downlink traffic load from the WiMAX base station using the WLAN key;

a decryption unit, configured to decrypt an uplink traffic load from the WiMAX subscriber station by using the WLAN key; The transceiver device receives an uplink traffic load from the WiMAX subscriber station, and transmits the decrypted uplink traffic load to the WiMAX base station; receives a downlink traffic load from the WiMAX base station, and sends a downlink traffic load to the WiMAX base station. The WiMAX subscriber station transmits the encrypted downlink traffic load.