Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/18—Selecting a network or a communication service
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
  • H04W88/08—Access point devices

Definitions

• the invention relates to a method of associating an apparatus in a communication network, in particular a local network, capable of sharing the same resource in transmission frequency as another neighboring network.
• the invention is particularly applicable in the context of broadband radio transmission access networks ('Broadband Radio Access Networks' or BRAN in English), when a device must be associated with an existing network.
• broadband radio transmission access networks 'Broadband Radio Access Networks' or BRAN in English
• Local networks using a sharing of the radio resource in FDMA mode are required to use a channel from a finite set of channels given and granted by the standardization bodies.
• a device which has to associate with a network can also communicate with a base station of another network. This raises the problem of the collision of frames from the two networks at this device.
• the invention aims to remedy this problem.
• the subject of the invention is a method of association of apparatus in a first communication network, the transmissions in the first network being carried out on a first channel, characterized in that said method comprises the steps of:
• the method further comprises the step of associating the device with a base station of the first network, following the non-detection of collision.
• the method further comprises repeating the steps of claim (a) to (c) until the first network is stalled on a channel for which no collision is detected.
• the channel change request comprises at least one of the following parameters: an identifier of the first network, an identifier of the device, the number of times that the request has been sent, a suggestion of transmission channel for the first network.
• FIG. 1 schematically shows two local networks implementing the method according to this embodiment
• - Figure 2 is a flow diagram of the method according to the present exemplary embodiment.
• ETSI European standards institute telecommunications
• BRAN Packet based Convergence Layer for HIPERLAN and HIPERACCESS; Part 2: Ethernet Service Specifies Convergence Sublayer
• FIG. 1 is a diagram of two homes each with a local network, N1 and N2 respectively.
• Each network includes a central device or base station AP1, respectively AP2.
• These base stations are the respective central organs of each of the networks N1 and N2. In terms of function, they include the functionality of 'Central Controllers' from the HIPERLAN 2 environment.
• Each network also includes MTx mobile terminals, communicating with the access point associated with the network.
• the network N1 comprises the terminals MT1 and MT2, while the network N2 comprises the terminals MT3 and MT4.
• this terminal traverses the frequency channels on which the networks may transmit until a signal of sufficient strength and intelligibility is detected. The intelligibility is linked to the error rate detected by the terminal in the data received.
• the two networks N1 and N2 use the same transmission channel. Furthermore, for the purposes of the example, it is assumed that the terminal MT5 can communicate both with the base station of the network N1 and with the base station of the network N2. In the event that the traffic on each of the two networks N1 or N2 does not occupy the entire time frame, the new terminal has the possibility of intelligibly receiving information from at least one of the networks. According to the present example, it is the network N1. Generally, the first information thus collected concerns the identity of the N1 network and access rights. This information allows the terminal to determine whether it has access rights on this network N1.
• the terminal MT5 has prior knowledge of the identifier of the network with which it is supposed to be associated. It thus recognizes the frame corresponding to this network.
• This identifier can be the identifier 'Network_Operator_ID ⁇
• the terminal In the case where the terminal has the right to access this network N1, it initiates a procedure called association, and by which the terminal registers in the network N1 and obtains an identity in return.
• the protocols generally implemented for this operation require dialogues between on the one hand the terminal and on the other hand the already formed network. For example, it is often required to authenticate the terminal before granting it an identity in the network.
• the communications between the terminal and the network N1 are subject to disturbances emanating from the network N2. There is therefore no guarantee that the association procedure will be carried out correctly, since it is highly dependent on activity on the competing N2 network.
• the response of the network N1 to the request for association of the terminal may collide at the terminal with a portion of traffic from the network N2. This is detected by the MT5 terminal by the fact that certain frames or parts of frames are not decodable.
• the MT5 terminal will declare that it is in an interference situation when it is unable to receive these messages correctly association from network N1.
• the signal for example a frame from another network, to be intelligible to the device seeking to detect the interference.
• the terminal simply has to know the address of the access point of the network with which it wishes to be associated.
• the terminal instead of initiating a conventional association procedure, the terminal sends a so-called emergency request to the network N1, consisting of a request to the network N1 to initiate dynamic frequency selection, excluding the current frequency.
• This request also contains the identity of the network N1, in order to prevent the two networks N1 and N2 from simultaneously changing frequency: the networks detect the identity and only react if it is addressed to them.
• the emergency request is transmitted in the RCH field of the HIPERLAN 2 frame of the N1 network.
• the emergency request has the following parameters:
• the third parameter can influence the decision of the base station AP1 to accept or not the terminal request, in the event of malfunction of the mobile terminal. This field is optional.
• the BCCH field is a field of the frame defined by the documents relating to HIPERLAN 2.
• the urgent request also includes a suggestion of channel on the part of the terminal. This suggestion can be determined as follows: the terminal monitors activity on different channels, for example for a predetermined time, and thus determines which channels are likely to be unoccupied.
• This technique guarantees that the terminal is correctly understood by the network N1, because the terminal has issued its request in the expected area of the frame of the network N1.
• Network A has recognized its identity in this request and is initiating a SFD.
• the network N1 will have changed frequency and then the terminal will initiate a normal association procedure on this new frequency, provided of course that there is no collision with a third network.
• the terminal's emergency request will be received by members of the N2 network either intelligibly or in collision with a portion of the traffic on this network. In the event of a collision, this is resolved by the repetition mechanism or by the error correcting coding used by the network N2. This request being short, it only very locally disrupts the activity of the N2 network.
• the members of the network N2 understand that the request for SFD relates to the network N1, and thus no SFD is implemented.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Computer Security & Cryptography (AREA)
• Mobile Radio Communication Systems (AREA)
• Small-Scale Networks (AREA)

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• 1999
  • 1999-09-28 FR FR9912051A patent/FR2799082B1/fr not_active Expired - Fee Related
• 2000
  • 2000-09-28 AU AU76688/00A patent/AU7668800A/en not_active Abandoned
  • 2000-09-28 DE DE60043735T patent/DE60043735D1/de not_active Expired - Lifetime
  • 2000-09-28 WO PCT/FR2000/002694 patent/WO2001024452A1/fr not_active Ceased
  • 2000-09-28 KR KR1020027003586A patent/KR100687674B1/ko not_active Expired - Fee Related
  • 2000-09-28 US US10/089,539 patent/US7177291B1/en not_active Expired - Lifetime
  • 2000-09-28 EP EP00966225A patent/EP1216543B1/fr not_active Expired - Lifetime
  • 2000-09-28 JP JP2001527510A patent/JP4527336B2/ja not_active Expired - Fee Related
  • 2000-09-28 CN CN008127956A patent/CN1373953B/zh not_active Expired - Fee Related
  • 2000-09-28 MX MXPA02002820A patent/MXPA02002820A/es active IP Right Grant

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