EP0474489A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Transmission control for a wireless local area network
Assignee: Nokia of America Corp
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Filing: 1991-09-05
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Granted: —
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Expires: 2011-09-05
Abstract
Abstract In a local area network station (12) for a wireless LAN, a threshold level circuit (62) includes a register (134) which stores a threshold value. The station receiver (42) monitors the transmission channel and provides a receive level signal indicative of the signal level received. Transmission of a data frame by the station transmitter (46) is permitted or deferred according as the receive level signal value is below or above the threshold level, regardless of whether or not the received signal derives from a transmission by a station in the receiving station's own LAN. The threshold is dynamically updated whenever the station (12) receives a data frame from its own LAN. An improved utilization of the wireless transmission channel is achieved.
Inventors
- 👤 Bruce Tab Tuch
- 👤 Hans Van Driest
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 03:51
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A method of operating a local area network station (12) on a wireless transmission channel, wherein said station (12) includes receiver means (42) and transmitter means (46), characterized by the steps of: determining a receive signal level representing the signal level received by said receive means (42) over said transmission channel;determining the relative value of said receive signal level and threshold level; and controlling the operation of said transmitter means (46) in dependence on said relative value.
Claim 2
Dependent Claim
33 words
A method according to claim 1, characterized in that said controlling step is effected by inhibiting the operation of said transmitter means (46) when said receive signal level is above said threshold level.
Claim 3
Dependent Claim
22 words
A method according to claim 1 or claim 2, characterized in that said determining step is effected dynamically for said threshold level.
Claim 4
Dependent Claim
106 words
A local area network station for receiving signals on a wireless transmission channel, including receiver means (42) and transmitter means (46), characterized in that said receiver means (42) includes receive level determination means (82) adapted to provide a receive level signal (RL) representing the signal level received over said transmission channel, by threshold level circuit means (62) adapted to provide a level indicator signal (AT) in dependence on the relative value of said receive level signal (RL) and a threshold level value, and by transmitter control means (58) adapted to control the operation of said transmitter means (46) in dependence on said level indicator signal (AT).
Claim 5
Dependent Claim
82 words
A local area network station according to claim 4, characterized in that said station (12) includes user logic means (54) adapted to generate a request-to-send signal (RTS) if it is desired to transmit a data frame, and in that said transmitter control means (58) is adapted to provide a transmission enabling signal (RTSA) if said request-to-send signal (RTS) is generated and said level indicator signal (AT) indicates that the value of said receive level signal (RL) is below said threshold level value.
Claim 6
Dependent Claim
22 words
A local area network station according to claim 4 or claim 5, characterized in that said threshold level value is dynamically adjustable.
Claim 7
Dependent Claim
67 words
A local area network station according to claim 6, characterized in that said data signal are transmitted in the form of data frames containing network identification data (NWID) identifying the network to which said station (12) belongs, and in that said threshold level value is adjusted only when a data frame is received which includes network identification data matching the network identification data of said station (12).
Claim 8
Dependent Claim
64 words
A local area network station according to claim 7, characterized in that, if said receive level signal (RL) is greater than said threshold level value, said threshold level value is incremented by a predetermined value (G), and if said receive level signal is less than said threshold level value, said threshold level value is replaced by the value of said receive level signal (RL).
Claim 9
Dependent Claim
71 words
A local area network station according to claim 8, characterized in that said threshold level circuit means (62) includes a threshold value register (134) adapted to store said threshold level value, and comparison means (146) having a first input coupled to an output of said thresbold value register (134), a second input adapted to receive said receive level signal (RL) and an output adapted to provide said level indicator signal (AT).
Claim 10
Dependent Claim
83 words
A local area network station according to claim 9, characterized in that said threshold level circuit means (62) includes adder means (138) having a first input connected to said output of said threshold value register (134) a second input adapted to receive said predetermined value (G), and an output coupled to a first input of multiplexer means (132) having a second input adapter to receive said receive level signal (RL) and a control input coupled to said output of said comparison means (146).
References Cited (Backward Citations)
No citation records indexed.
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