# US 2010/0167776 A1 · Avoiding disturbance of restricted local access points in a wireless network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0167776 A1 - Document ID: US20100167776A1 - Status: Published application - Kind: A1 - Application number: 12/280,275 - Filed: 2006-05-30 - Published: 2010-07-01 - Earliest claimed: 2006-02-21 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Martin Bäckström; Larsson Anders; Walldeen Thomas - Web page: https://patentgrep.com/patent/US20100167776A1 ## CPC - H04W 52/322: {Power control of broadcast channels} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 52/343: {taking into account loading or congestion level} - H04W 48/12: using downlink control channel - H04W 52/243: {taking into account interferences} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method of determining output power in a first restricted local access point in a wireless network, a device implementing a restricted local access point, a wireless network as well as a computer program product for determining output power in a restricted local access point. A restricted local access point scans the network for determining broadcasting channels used by surrounding access points, selects a broadcasting channel that receives the lowest disturbance by surrounding access points, varies the output power of this channel for obtaining a desired relation to the disturbance and determines if a main disturbing access point is another restricted local access point. If it is, a threshold is set for one of the quantities of the relation, which the quantity is not allowed to pass, the output power is varied for providing the desired relation without said quantity passing said threshold and otherwise another channel is selected. ## Claims ### Claim 1 Method of determining output power for communication with mobile stations in a first restricted local access point in a wireless network, comprising the steps of: scanning the network for determining broadcasting channels used by surrounding wireless access points, selecting a broadcasting channel that receives the lowest disturbance from surrounding access points, varying the output power of the selected broadcasting channel in order to provide a desired relation to the disturbance, determining if a main disturbing access point is another restricted local access point, and in case it is, performing the further steps of setting a threshold for one of the quantities of the relation, which the quantity in question is not allowed to pass, varying the output power for providing the desired relation without said quantity passing said threshold, and selecting another channel if the desired relation cannot be obtained without the quantity passing the threshold. ### Claim 2 (depends on 1) Method according to claim 1, further comprising the step of registering identities of the surrounding access points. ### Claim 3 (depends on 1) Method according to claim 1 further comprising the step of varying the output power for providing the desired relation in case a main disturbing access point is not another restricted local access point. ### Claim 4 (depends on 1) Method according to claim 1, wherein the step of determining if the main disturbing access point is another restricted local access point comprises analysing information broadcast by a neighbouring access point. ### Claim 5 (depends on 4) Method according to claim 4, wherein the step of determining if the main disturbing access point is another restricted local access point comprises analysing an identity associated with the main disturbing access point being provided in said broadcast information. ### Claim 6 (depends on 5) Method according to claim 5, wherein the identity is broadcast by another access point than the main disturbing access point. ### Claim 7 (depends on 5) Method according to claim 5, wherein the identity is broadcast by the main disturbing access point. ### Claim 8 (depends on 4) Method according to claim 4, wherein the step of determining if the main disturbing access point is another restricted local access point comprises identifying a restricted local access point indication in a system information message broadcast by the main disturbing access point in said broadcast information. ### Claim 9 (depends on 1) Method according to any claim 1, wherein the step of determining if a main disturbing access point is another restricted local access point comprises querying a network control unit whether said main disturbing access point is another restricted local access point and receiving an answer from said network control unit. ### Claim 10 (depends on 1) Method according to claim 1, further comprising the step of broadcasting information that allows said first restricted local access point to be identified as a restricted local access point. ### Claim 11 (depends on 1) Method according to claim 1, wherein the broadcasting channel is primarily selected from channels used by unrestricted global access points in the network. ### Claim 12 (depends on 1) Method according to claim 1, wherein the broadcasting channel is primarily selected from channels used by other restricted local access points in the network. ### Claim 13 (depends on 1) Method according to claim 1, further comprising the step of varying a training sequence broadcast on the selected channel based on the determined disturbances. ### Claim 14 Device implementing a restricted local access point for provision in a wireless network and being arranged to scan the network for determining broadcasting channels used by surrounding wireless access points in the network, select a broadcasting channel that receives the lowest disturbance by surrounding access points, vary the output power of the selected broadcasting channel in order to provide a desired relation to the disturbance, determine if a main disturbing access point is another restricted local access point, and in case it is, set a threshold for one of the quantities of the relation, which the quantity in question is not allowed to pass, vary the output power for providing the desired relation without said quantity passing said threshold, and select another channel if the desired relation cannot be obtained without the quantity passing the threshold. ### Claim 15 (depends on 14) Device implementing a restricted local access point according to claim 14, being further arranged to register identities of the surrounding access points. ### Claim 16 (depends on 14) Device implementing a restricted local access point according to claim 14, being further arranged to vary the output power for providing the desired relation in case a main disturbing access point is not another restricted local access point. ### Claim 17 (depends on 14) Device implementing a restricted local access point according to claim 14, which when being arranged to determine if a main disturbing access point is another restricted local access point is further arranged to analyse information broadcast by a neighbouring access point. ### Claim 18 (depends on 17) Device implementing a restricted local access point according to claim 17, which when being arranged to determine if the main disturbing access point is another restricted local access point is arranged to analyse an identity associated with the main disturbing access point being provided in said broadcast information. ### Claim 19 (depends on 18) Device implementing a restricted local access point according to claim 18, wherein the identity is broadcast by another access point than the main disturbing access point. ### Claim 20 (depends on 18) Device implementing a restricted local access point according to claim 18, wherein the identity is broadcast by the main disturbing access point. ### Claim 21 (depends on 17) Device implementing a restricted local access point according to claim 17, which when being arranged to determine if the main disturbing access point is another restricted local access point is arranged to identify a restricted local access point indication in a system information message broadcast by the main disturbing access point in said broadcast information. ### Claim 22 (depends on 14) Device implementing a restricted local access point according to claim 14, which when being arranged to determine if a main interfering access point is another restricted local access point is further arranged to query a network control unit whether said main interfering access point is a restricted local access point and receive an answer from said network control unit. ### Claim 23 (depends on 14) Device implementing a restricted local access point according to claim 14, being further arranged to broadcast information that allows it to be identified as a restricted local access point. ### Claim 24 (depends on 14) Device implementing a restricted local access point according to claim 14, wherein the broadcasting channel is primarily selected from channels used by other restricted local access points in the network. ### Claim 25 (depends on 14) Device implementing a restricted local access point according to claim 14, wherein the broadcasting channel is primarily selected from channels used by other restricted local access points in the network. ### Claim 26 (depends on 14) Device implementing a restricted local access point according to claim 14, being further arranged to vary a training sequence broadcast on the selected channel based on the determined disturbances. ### Claim 27 Wireless network comprising: a number of unrestricted global access points, and a number of devices, each implementing a restricted local access point where a device implementing a restricted local access point is arranged to scan the network for determining broadcasting channels used by surrounding wireless access points in the network, select a broadcasting channel that receives the lowest disturbance by surrounding access points, vary the output power of the selected broadcasting channel in order to provide a desired relation to the disturbance. determine if a main disturbing access point is another restricted local access point, and in case it is, set a threshold for one of the quantities of the relation, which the quantity in question is not allowed to pass, vary the output power for providing the desired relation without said quantity passing said threshold, and select another channel if the desired relation cannot be obtained without the quantity passing the threshold. ### Claim 28 Computer program product for determining output power for communication with mobile stations in a restricted local access point in a wireless network, comprising computer program code to make a device implementing such a restricted local access point perform, when the code is loaded into said device: scan the network for determining broadcasting channels used by surrounding wireless access points in the network, select a broadcasting channel that receives the lowest disturbance by surrounding access points, vary the output power of the selected broadcasting channel in order to provide a desired relation to the disturbance, determine if a main disturbing access point is another restricted local access point, and in case it is, set a threshold for one of the quantities of the relation, which the quantity in question is not allowed to pass, vary the output power for providing the desired relation without said quantity passing said threshold, and select another channel if the desired relation cannot be obtained without the quantity passing the threshold.