# US 8,787,301 B2 · Method and device for interference mitigation using redundant transmission in separate ISM bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,301 B2 - Document ID: US8787301B2 - Status: Granted - Kind: B2 - Application number: 11/578,501 - Filed: 2005-04-11 - Published: 2007-09-20 - Granted: 2014-07-22 - Earliest claimed: 2004-04-16 - Assignees: DSP Group Switzerland AG - Applicants: Martin Haeusler - Inventors: Martin Haeusler - Web page: https://patentgrep.com/patent/US8787301B2 ## CPC - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/541: using the level of interference - H04W 74/04: Scheduled access (hybrid access H04W74/02) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A device for transmitting data packets over a data link, including an interference signal detector adapted to continually detect a frequency of interference signals on the data link, designator adapted to assign a first frequency channel and a first time slot on the data link, wherein the first frequency channels lies within a 2.4 GHz industrial scientific and medical (ISM) band, and adapted to assign a second frequency channel and a second time slot on the data link, wherein the second frequency channel lies within a 5.8 GHz ISM Band, transmitter adapted to transmit each data packet within the first time slot and the first frequency channel and within the second time slot and the second frequency channel, if the frequency of the interference signals lies within the 2.4 GHz or the 5.8 GHz band. ## Claims ### Claim 1 A method for transmitting data packets over a wireless data link, the method comprising the steps: continually searching for interference signals on the data link, assigning a first frequency channel and a first time slot on the data link, wherein the first frequency channels lies within a first industrial scientific and medical (ISM) band, assigning a second frequency channel and a second time slot on the data link, wherein the second frequency channel lies within a second ISM Band, transmitting a data packet within the first time slot and the first frequency channel and within the second time slot and the second frequency channel, if the frequency of the interference signals lies within the first ISM or the second ISM band. ### Claim 2 (depends on 1) A method for transmitting data packets over a wireless data link according to claim 1, further comprising the steps: continually detecting a duration of interference signals, determining an average duration of the interference signals, assigning the first and second time slots in such a way that the second time slot is separated in time from the first time slot by a duration greater than the average duration of the interference signals. ### Claim 3 (depends on 1) A method for transmitting data packets over a wireless data link according to claim 1, further comprising the steps: creating a list of interfered frequency channels and assigning the first and/or second frequency channels in such a way, that they do not overlap the interfered frequency channels of the list. ### Claim 4 (depends on 1) A method for transmitting data packets over a wireless data link according to claim 1, wherein the data link is subject to periodic bursts of interference comprising the steps: detecting a presence of periodic bursts of interference determining when a periodic burst will appear, selecting the first or the second time slot in such a way that an interference burst does not occur during the selected time slot, transmitting the data packet on the selected time slot. ### Claim 5 A device for transmitting data packets over a data link, comprising: an interference signal detector adapted to continually detect a frequency of interference signals on the data link, designator adapted to assign a first frequency channel and a first time slot on the data link, wherein the first frequency channels lies within a first industrial scientific and medical (ISM) band, and adapted to assign a second frequency channel and a second time slot on the data link, wherein the second frequency channel lies within a second ISM Band, transmitter adapted to transmit each data packet within the first time slot and the first frequency channel and within the second time slot and the second frequency channel, if the frequency of the interference signals lies within the first or the second ISM. ### Claim 6 (depends on 5) A device for transmitting data packets over a data link according to claim 5, further comprising: calculator adapted to determine an average duration of the interference signals, wherein the interference signal detector is adapted to continually detect a duration of the interference signals, the designator is adapted to assign the first and second time slots in such a way that the second time slot is spaced in time from the first time slot by a duration greater than the average duration of the interference signals. ### Claim 7 (depends on 5) A device for transmitting data packets over a data link according to claim 5, further comprising: a compiler adapted to list interfered frequency channels wherein said designator is adapted to assign the first and/or second frequency channels in such a way, that they do not overlap the interfered frequency channels. ### Claim 8 (depends on 5) A device for transmitting data packets over a data link according to claim 5, wherein the interference signal detector is adapted to detect a presence of periodic bursts of interference, the calculator is adapted to determine an average duration of the interference signals and determine when a periodic burst will appear, and the selector being adapted to select the first or second time slot in away such that an interference burst does not occur during the selected time slot.