WO2008083632A1 - Procédé, dispositif et système de partage du spectre - Google Patents

Procédé, dispositif et système de partage du spectre Download PDF

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Publication number
WO2008083632A1
WO2008083632A1 PCT/CN2008/070079 CN2008070079W WO2008083632A1 WO 2008083632 A1 WO2008083632 A1 WO 2008083632A1 CN 2008070079 W CN2008070079 W CN 2008070079W WO 2008083632 A1 WO2008083632 A1 WO 2008083632A1
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WO
WIPO (PCT)
Prior art keywords
protection device
basic protection
basic
alternative
spectrum sharing
Prior art date
Application number
PCT/CN2008/070079
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English (en)
Chinese (zh)
Inventor
Mingwei Jie
Linjun Lv
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CNA2007100066117A external-priority patent/CN101222745A/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008083632A1 publication Critical patent/WO2008083632A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a spectrum sharing method, device, and system. Background of the invention
  • This mode of operation also known as the SP (Pixel Pool) system, allows the user (LU) to have priority rights to use the spectrum, and the license-free users (also called RU lease users, SU second users) do not affect the LU. These bands can be used below.
  • the Wireless Regional Network (WRAN) system is such a system of license-exempt operation.
  • the WRAN system uses the cognitive radio technology to find the unoccupied frequency band as the bearer band of the WRAN network in the frequency band allocated to the VHF/UHF band of television broadcasting (54 MHz to 862 MHz in North America).
  • the WRAN system must detect signals from existing users in the band (such as DTV and Part 74 devices (such as wireless microphones)) to avoid interference with these users.
  • IEEE 802.22 specifically established the 802.22.1 working group to study the protection of Part 74 devices.
  • Protected device is a protected device, and this application refers to a Part 74 device.
  • Protecting The device is a protection device that protects the devices of the protected device. It is deployed in the vicinity of the Part 74 device and sends the channel information occupied by the Part 74 device to the WRAN system to protect the Part 74 device. It is divided into a primary protecting device (PPD) and a secondary protecting device (SPD). Since the device mainly communicates with each other by transmitting beacons, it can also be called a beacon device.
  • PPD primary protecting device
  • SPD secondary protecting device
  • the channel is monitored for a certain period of time. If the protection device does not exist on the channel during this time, the protection device will work as a basic protection device. If it is detected that there is already a protection device, the protection device will be selected as PPD or SPD according to the instructions of the upper layer.
  • Figure 1 shows the superframe structure of the existing PPD.
  • the front is the N sync burst (synchronous burst) fields.
  • the SPD and WRAN systems quickly detect the PPD based on these synchronous bursts, and the SPD passes these synchronous bursts and PPDs. Synchronization, the value of N is determined by the PPD, and the maximum is 382. These N synchronous bursts can only be sent periodically by the PPD, and the SPD can only receive them.
  • the synchronous burst field is a beacon frame field, which is composed of a 0th synchronous burst and a beacon PSDU. The PPD and the SPD can send a beacon to notify the WRAN system which frequency bands are occupied by the Part 74 device.
  • the PPD will receive the RTS (Request to Send) burst field from the SPD, through which the SPD informs the PPD that it wants to send the beacon.
  • the PPD sends an ACK in the next ANP (Acknowledgement/No Acknowledgement Period), then the SPD will send the beacon in the beacon time of the next superframe, and the PPD can only receive the beacon sent by the SPD as a receiver. .
  • the PPD can combine the beacon message with the data detected by itself and send it at the next sending time.
  • the WRAN can receive the beacon sent by the PPD or the beacon sent by the SPD to obtain the channel occupation information.
  • the RTS is sent to cause a collision.
  • the SPDs that send the RTS will not be able to send the beacon in the next superframe.
  • These SPDs will use a random backoff time to determine the time of the next RTS transmission.
  • the RTS conflicts until the beacon is sent when the ACK sent by the PPD is received. That is to say, in a frame period, the synchronous burst and ANP are sent by the PPD, and the beacon may be sent by the PPD or the SPD, and the Rx period is the time when the SPD is sent.
  • FIG. 2 and Figure 3 are signalling diagrams for data transmission from PPD to SPD and SPD to PPD, respectively.
  • the PPD sends data to the SPD
  • the SPD sends the sent data directly in the beacon PSDU.
  • the SPD sends data to the PPD, it first sends an Interrupt burst (that is, RTS burst) to interrupt the transmission of the PPD.
  • the PPD sends an ACK acknowledgement in the ANP
  • the SPD can send the beacon in the next superframe.
  • a schematic diagram of a beacon frame is sent for the existing SPD interrupt PPD.
  • the PPD sends a synchronization burst and a beacon frame. Then the PPD listens to the RTS burst sent by the SPD.
  • the PPD receives an RTS burst, and then sends an ACK in the ANP.
  • the PPD first sends the synchronous burst, because the SPD in Figure 4 has received the ACK. Therefore, the SPD will send the beacon frame at this time, and then the PPD continues to listen to the RTS burst sent by the SPD.
  • the PPD does not receive the RTS burst, so a NACK is sent; in Figure 6, since the PPD is sent in the previous superframe. It is NACK, so the beacon frame will be sent by the PPD at this time. The scene in Figure 6 is repeated until the RTS bursto is received again.
  • the protection device when the protection device is initialized, it is necessary to confirm whether the PPD already exists. If there is a PPD, the protection device can choose to work as the SPD of the PPD. When the PPD does not work for some reason (such as power failure, shutdown, etc.), these SPDs will not receive the synchronous burst. If SPD has not received synchronization for a certain period of time Burst, will think that PPD is not working, then these SPD will negotiate to generate a new PPD. Thereafter, the new PPD will enter the initial transmission process, that is, a series of consecutive superframes that transmit for up to 30 seconds (the superframes do not include Rx period and ANP), so that the SPD can know the existence of the PPD and synchronize with the PPD.
  • the initial transmission process that is, a series of consecutive superframes that transmit for up to 30 seconds (the superframes do not include Rx period and ANP), so that the SPD can know the existence of the PPD and synchronize with the PPD.
  • the time required for this negotiation and initial transmission process is 4 , long, if the WRAN system operates on the same channel as the Part 74 device during that time, and these channels are monitored by the SPD, but the superframe transmitted by the PPD does not include Rx period and ANP, so SPD will not be able to notify the WRAN system of interference, which will cause interference to Part 74 equipment, and can not guarantee the timeliness of Part 74 equipment protection.
  • the object of the present invention is to provide a spectrum sharing method, device and system, which utilizes an alternative basic protection device, avoids negotiation between SPDs and an initial transmission process of up to 30 seconds, and ensures that the pair has been The timeliness of user equipment protection; and thus a more optimized spectrum sharing method.
  • the present invention provides a spectrum sharing method, including the following steps: protecting a device for initializing, determining that a basic protection device has been set;
  • the basic protection device sets more than one second protection device as an alternative basic protection device.
  • a spectrum sharing device includes a selection unit, a processing unit, and a sending unit, where
  • a selection unit configured to select one or more second protection devices as an alternative basic protection device
  • a processing unit configured to upload identification information of the candidate basic protection device selected by the selection unit to the upper layer, and encapsulate the identification information in the beacon In the frame, sent to the sending unit;
  • a spectrum sharing system configured to send the received beacon frame carrying the identifier information of the candidate basic protection device to the second protection device, to notify the selected candidate basic protection device.
  • a spectrum sharing system includes a protection device, a basic protection device, and a second protection device, wherein the protection device is used for initializing, and the basic protection device is determined to be set on the monitoring channel; the basic protection device has more than one second protection The device is set as an alternative basic protection device.
  • the present invention introduces an alternative basic protection device, that is, when the basic protection device is in operation, one or more second protection devices are selected as alternative basic protection devices, and priority is assigned to these alternative basic protection devices, when the PPD stops working,
  • the alternative basic protection device with the highest priority immediately becomes the basic protection device, while other priority alternative basic protection devices (subordinate alternative basic protection devices) increase their own priority by one Level, the highest priority alternative basic protection device in the subordinate alternative basic protection device becomes the primary alternative basic protection device.
  • the 30-second initial transmission process ensures the timeliness of protection of existing user equipment, such as Part74 equipment, and optimizes the spectrum sharing method.
  • 1 is a superframe structure diagram of an existing PPD
  • the figure shows the signaling diagram of the existing PPD to SPD data transmission
  • FIG. 3 is a signaling diagram of data transmission of an existing SPD to PPD
  • FIG. 4 is a schematic diagram of a conventional SPD interrupt PPD for transmitting a beacon frame
  • FIG. 5 is a schematic diagram 2 of an existing SPD interrupt PPD for transmitting a beacon frame
  • FIG. 6 is a conventional SPD interrupt PPD for transmitting a beacon frame.
  • FIG. 7 is a flowchart of an embodiment of a spectrum sharing method according to the present invention.
  • FIG. 8 is a reference model diagram of a MAC sublayer according to an embodiment of a spectrum sharing method according to the present invention
  • FIG. 9 is a schematic structural diagram of a beacon frame sent by a protection device according to an embodiment of a spectrum sharing method according to the present invention
  • FIG. 10 is another schematic structural diagram of a beacon frame sent by a protection device according to an embodiment of a spectrum sharing method according to the present invention.
  • FIG. 11 is a schematic structural diagram of a superframe according to an embodiment of a spectrum sharing method according to the present invention.
  • FIG. 12 is a schematic diagram of a format of a parameter 2 in a beacon frame according to an embodiment of a spectrum sharing method according to the present invention
  • FIG. 13 is a schematic diagram 1 of a whole process of PPD selection and notification of BPPD according to an embodiment of the spectrum sharing method of the present invention
  • FIG. 14 is a second schematic diagram of the entire process of PPD selection and notification of BPPD according to an embodiment of the spectrum sharing method of the present invention.
  • 15 is a schematic diagram 3 of the entire process of PPD selection and notification of BPPD according to an embodiment of the spectrum sharing method of the present invention.
  • 16 is a schematic structural diagram of a basic protection device according to an embodiment of the present invention.
  • FIG. 17 is a schematic structural diagram of a spectrum sharing system according to an embodiment of the present invention. Mode for carrying out the invention
  • the present invention introduces a backup primary protecting device (BPPD), that is, when the PPD is working, the SPD is selected as the BPPD, and the BPPD is assigned a priority, and the PPD has the highest priority when the PPD stops working.
  • BPPD backup primary protecting device
  • BPPD immediately becomes a PPD job
  • other priority BPPDs subordinate BPPDs
  • the highest priority BPPD in the subordinate BPPD becomes the primary BPPD.
  • the spectrum sharing method of the present invention comprises the following steps:
  • the protection device is initialized to determine that the basic protection device has been set
  • the basic protection device sets one or more second protection devices as an alternative basic protection device Ready.
  • FIG. 7 is a flowchart of an embodiment of a spectrum sharing method according to the present invention. The detailed process is as follows:
  • Step 301 A protection device (PD) is initialized to determine a channel that it needs to monitor;
  • Step 302 The protection device monitors 2 + 0.01 m seconds on the channel to determine whether a PPD already exists, where m is an integer randomly selected from the set [0, 1, 2, ..., 98, 99, 100]. If, during the initial monitoring process, the protection device does not find the PPD on the channel (that is, no synchronization burst or beacon frame is detected), the protection device sets itself to the PPD according to the indication of the upper layer and starts to periodically send the beacon;
  • the new PPD will send a series of consecutive superframes with a time of up to 30 seconds. These superframes will not include the reception period and ANP; after the initial transmission, the PPD enters the normal working state and continues to send the superframe. The superframe at this time will include the receive period and ANP.
  • FIG. 8 it is a reference model diagram of a MAC sublayer of the spectrum sharing method embodiment of the present invention.
  • the MAC sublayer provides an interface between an upper layer and a PHY layer, and the MAC sublayer includes a MAC Sublayer Management Entity (MAC Sublayer Management Entity, MLME), MLME provides a method for transmitting information between the upper layer and the MAC sublayer.
  • MLME needs to maintain a database (MAC Information Base, MIB) to store information related to the MAC sublayer;
  • MIB MAC Information Base
  • MLME-SAP MLME service access point
  • Table 1 is the various primitives supported by the MLME through the MLME-SAP interface.
  • MLME-BPPD is added to the table to indicate the selection of BPPD;
  • Table 1 primitives supported by MLME-SAP
  • Step 303 when the PPD is working, the upper layer sends an MLME-BPPD.request to notify the MLME that the BPPD needs to be selected, and can notify the method of selecting the BPPD;
  • Step 304 the MLME selects the BPPD according to the method indicated by the upper layer, and assigns a priority to the BPPD, the BPPD with the highest priority is the primary BPPD, the other BPPD is the dependent BPPD, and sends the MAC address of the selected SPD of the MLME-BPPD.indication. Reported to the upper level;
  • the upper layer may not notify the method of selecting the BPPD, in which case the PPD itself selects the method of selecting the BPPD; in addition, the PPD may automatically trigger to select the BPPD when there is no indication in the upper layer;
  • Step 305 the upper layer sends the MLME-BPPD.confirm to notify the MLME of the selected result. If the upper layer does not agree to select the SPD as the BPPD, the upper layer may further notify the MLME to reselect the BPPD through the MLME-BPPD.request, and the MLME-BPPD format respectively As shown in Tables 2, 3, and 4. Table 2, MLME-BPPD .request parameters
  • FIG. 9 is a schematic structural diagram of a beacon frame sent by a protection device according to an embodiment of the spectrum sharing method of the present invention, where Source Address, Location, and Timestamp are respectively separated by 1 J, which are identifiers, location information of a protection device that sends the beacon.
  • the transmission time of the beacon frame, and the Subchannel map is the channel information occupied by the Part 74 device.
  • the protection device informs the WRAN system through the beacon, which channels are occupied by the Part 74 device, and the WRAN system cannot use these occupied channels.
  • Step 304 Selecting the BPPD is specifically: after receiving the indication of the upper layer, the PPD needs to select one or more BPPDs. If only one BPPD is selected, the PPD may send the first SPD to send the beacon, and the source of the SPD is sent by the PPD. Address, the Source Address is the identification information of the SPD, which may be a MAC address; and, the PPD selects the SPD as BPPD, and may add a BPPD Address to the Beacon frame by sending the BPPD The identification information is used to notify all SPDs of the selected PPD identifiers, as shown in Figure 10. When BPPD has not been selected, the BPPD Address can be set to zero, and a BPPD Priority can be added after the BPPD Address. Level;), the content is the priority of the selected BPPD. As shown in Table 5, for the BPPD Priority format table, the PPD can assign the first, second, and the like priorities to the BPPD in the order of selection.
  • the PPD can also not transmit the BPPD Address in the beacon frame.
  • the SPD only needs to judge whether it has been selected as BPPD by the value of the BPPD priority. That is, after the SPD sends the beacon, the PPD can decide whether to select the SPD as the BPPD. If the PPD decides to select the SPD as the BPPD, the PPD can be sent in the ANP period to prevent other SPDs from sending the beacon, and the beacon notification is selected by itself. BPPD. In this way, the SPD can determine whether it is selected as BPPD as long as it monitors the BPPD priority in the next beacon after sending the beacon. We can set SPD to know that it is selected as BPPD when the value of BPPD priority is not zero.
  • BPPD priority can also be sent by other methods as long as the BPPD priority is sent in the beacon frame.
  • Step 306 when the PPD does not work, the primary BPPD can immediately become the PPD work, so the PPD, BPPD, and SPD can work in any of the following three times: First, when the PPD is working normally, the selected primary BPPD Not working
  • FIG. 11 is a schematic diagram of a superframe structure of an embodiment of a spectrum sharing method according to the present invention.
  • a BPPS ANP of 2 bits is added between the Rx period and the ANP, and the primary BPPD sends a BPPD burst to notify the PPD whether it is in an active state during the period.
  • the state of the BPPD burst is shown in Table 6.
  • the PPD and the slave BPPD receive the primary BPPD burst as 00, it indicates that the primary BPPD will stop working in the next frame, so that all other priority secondary BPPDs should raise their own priority by one level, and the highest in the dependent BPPD.
  • the priority BPPD becomes the primary BPPD operation, and the BPPD burst is sent to notify the active state during the BPPD ANP of the next frame, and so on; if there is no other priority BPPD or no other BPPD, the PPD will start BPPD Select the program and reselect SPD as BPPD.
  • the PPD will consider that the primary BPPD is no longer working. Similarly, if there are other priority secondary BPPDs at this time, These dependent BPPDs should raise their own priority by one level, while the subordinate BPPD with the highest priority sends a BPPD burst to be active during the BPPD ANP of the next frame, and so on; if there is no other priority BPPD, It is also necessary to reselect SPD as BPPD.
  • Figure 12 is a schematic diagram of the format of parameter 2 in the beacon frame. If the PPD knows in advance that it will stop transmitting in the next superframe, it will notify BPPD and SPD via Cease Tx in parameter 2. A Cease Tx of 1 indicates that the PPD will stop transmitting in the next superframe.
  • the primary BPPD will immediately become the PPD operation, and send the synchronous burst in the next superframe, completely replacing the work of the PPD; and the highest priority BPPD in the secondary BPPD will immediately become the master.
  • BPPD works, and the priority of the remaining subordinate alternative basic protection devices is increased by one level.
  • the PPD does not notify the BPPD that it will stop transmitting through Cease Tx, and the BPPD and SPD do not detect the synchronous burst sent by the PPD in consecutive aMaxMissedPPD consecutive superframes, the 'j BPPD and SPD also think that the PPD does not work.
  • BPPD will immediately become PPD
  • the work of completely replacing the original PPD will start to send synchronous burst and beacon
  • the highest priority BPPD in the subordinate BPPD will immediately become the primary BPPD work, and the priority of the remaining subordinate alternative basic protection devices will be increased by one level. .
  • the situation in which both PPD and BPPD are not working may be due to: 1. PPD does not work. In aMaxMissedPPD + 3 (where 3 is the number of superframes required to select BPPD, see Figure 13-15), the main BPPD does not work in consecutive superframes; if there are other priorities In the case of subordinate BPPD, the highest level of these subordinate BPPD devices should immediately become the PPD work, and the priority of the remaining subordinate alternative basic protection devices is increased by two levels; if there is no other priority subordinate BPPD, then the SPD should negotiate to generate a PPD. And the initial transmission process is performed by the PPD;
  • BPPD does not work. In the aMaxMissedBPPD + 3 consecutive superframes, the PPD does not work. If there are other priority subordinate BPPDs, the highest level devices in these subordinate BPPDs should immediately become PPD jobs, and the remaining subordinates. The priority of the alternative basic protection device is increased by two levels; if there is no secondary BPPD of other priority, the SPD should also negotiate to generate a PPD, and the initial transmission process is performed by the PPD.
  • the ⁇ mouth protection device in aMaxMissedBeacons_new (aMaxMissedBeacons_new is greater than aMaxMissedPPD and aMaxMissedBPPD, aMaxMissedBeacons_new can be set to MAX (aMaxMissedPPD, aMaxMissedBPPD) + 1 , ie 3) no consecutive bursts are detected in the continuous superframe, then PPD and the main BPPD are considered If the system does not work, if the system does not select the subordinate BPPD of other priorities, the SPD will negotiate to generate a PPD, and the initial transmission process will be performed by the PPD, but the probability of such PPD and BPPD not working is small.
  • the PPD should select several subordinate BPPDs, so Can really avoid the negotiation between the SPD and the initial transmission process of up to 30 seconds.
  • the PPD selects and notifies the entire process of the BPPD.
  • the PPD receives an RTS burst, sends an ACK in the ANP, and no transmission during the BPPD ANP.
  • PPD write down the MAC of the SPD that sent the beacon Address, and the SPD is not transmitted during BPPD, BPPD ANP.
  • the PPD can send a NACK in the ANP regardless of whether it receives the RTS burst sent by the SPD in the Rx period, so that the PPD can send the beacon to notify the SPPD of the selected BPPD address in the next frame, thus reducing the selection.
  • BPPD time as shown in Figure 15, the PPD sends a beacon to notify the selected BPPD; BPPD sends a confirmation of its activation status during the BPPD ANP.
  • the spectrum sharing device includes a selection unit, a processing unit, and a sending unit, where
  • a selection unit configured to select one or more second protection devices as an alternative basic protection device
  • a processing unit configured to upload identification information of the candidate basic protection device selected by the selection unit to the upper layer, and encapsulate the identification information in the beacon In the frame, sent to the sending unit;
  • a sending unit configured to send the received beacon frame carrying the identifier information of the candidate basic protection device to the second protection device, and notify the selected candidate basic protection device.
  • the selection unit may further be used to select an alternative basic protection device according to the requirements of the upper layer.
  • the spectrum sharing device may further include a receiving unit, configured to receive a beacon frame sent by the second protection device, and send the signal to the processing unit;
  • the processing unit is configured to determine that the received beacon frame is sent by the second protection device for the first time, record the source address of the second protection device, and notify the selection unit to select the second protection device as the candidate basic protection device.
  • the processing unit may be further configured to assign an priority to the candidate basic protection device, encapsulate the allocated alternate basic protection device priority in the beacon frame, and send the priority to the sending unit.
  • FIG. 17 is a schematic structural diagram of a spectrum sharing system according to an embodiment of the present invention.
  • the spectrum sharing system includes a protection device, a basic protection device, and a second protection device.
  • the protection device is used for initializing, and the basic configuration is determined on the monitoring channel.
  • Protective equipment; basic protection More than one second protection device is set as an alternative basic protection device.
  • the basic protection device can also set the primary standby basic protection device and the dependent alternative basic protection device from the alternative basic protection device.
  • One of the working modes can be described as follows:
  • the highest priority alternative basic protection device among the subordinate alternative basic protection devices becomes the primary alternative basic protection device, and the remaining subordinate alternative basic protection devices
  • the priority is increased by one level; when there is no dependent alternative basic protection device, the basic protection device reselects the alternative basic protection device.
  • the present invention introduces an alternative basic protection device, that is, when the PPD is working, more than one SPD is selected as BPPD.
  • the BPPD primary BPPD
  • the BPPD primary BPPD
  • the highest priority alternative basic protection device in the subordinate BPPD becomes the primary BPPD work, thus avoiding negotiation between SPDs and up to 30
  • the initial transmission process of the second guarantees the timeliness of the protection of the Part74 device. After the PPD stops working, the negotiation between the SPDs and the initial transmission process of up to 30 seconds are basically avoided, and the timeliness of the protection of the Part 74 device is ensured.
  • the optimization of the spectrum sharing method is realized.

Abstract

L'invention concerne un procédé de partage de spectre consistant à : enclencher un dispositif de protection et déterminer si le dispositif de protection principal a été configuré, ledit dispositif configurant plus d'un dispositif de protection auxiliaire comme dispositif de protection principal de sauvegarde. La solution technique proposée fait intervenir le dispositif de protection principal de sauvegarde. Concrètement, le dispositif de protection principal configure plus d'un dispositif de protection auxiliaire comme dispositif de protection principal en cours de fonctionnement, puis attribue la priorité aux dispositifs de protections principaux de sauvegarde. Alors que le dispositif de protection principal arrête l'opération, le dispositif de protection principal de sauvegarde maître remplace immédiatement le dispositif de protection principal. Simultanément, le dispositif de protection principal de sauvegarde esclave améliore son niveau de priorité afin d'éviter une consultation entre les dispositifs de protection auxiliaires. Ainsi, le lancement de la transmission ne prend pas plus de 30 secondes pour garantir la protection du dispositif Part74 avec pour effet d'optimiser le procédé de partage du spectre.
PCT/CN2008/070079 2007-01-10 2008-01-10 Procédé, dispositif et système de partage du spectre WO2008083632A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200710063378 2007-01-10
CN200710063378.6 2007-01-10
CNA2007100066117A CN101222745A (zh) 2007-01-10 2007-01-19 频谱共享方法
CN200710006611.7 2007-01-19

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361258A (en) * 1993-10-22 1994-11-01 Bell Communications Research, Inc. Beacon detection system for sharing spectrum between wireless communications systems and fixed microwave systems
CN1650642A (zh) * 2002-03-29 2005-08-03 空气磁体公司 检测无线局域网中的伪接入点

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361258A (en) * 1993-10-22 1994-11-01 Bell Communications Research, Inc. Beacon detection system for sharing spectrum between wireless communications systems and fixed microwave systems
CN1650642A (zh) * 2002-03-29 2005-08-03 空气磁体公司 检测无线局域网中的伪接入点

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