# US 7,613,203 B2 · Method and device for managing a shared transmission medium based on a TDMA/TDD scheme > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,613,203 B2 - Document ID: US7613203B2 - Status: Granted - Kind: B2 - Application number: 10/962,607 - Filed: 2004-10-13 - Published: 2005-05-26 - Granted: 2009-11-03 - Earliest claimed: 2003-11-06 - Assignees: Mitsubishi Denki Kabushiki Kaisha - Inventors: Christophe Mangin; Romain Rollet - Web page: https://patentgrep.com/patent/US7613203B2 ## CPC - H04B 7/2656: {for structure of frame, burst} - H04W 48/12: using downlink control channel - H04W 84/12: WLAN [Wireless Local Area Networks] - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract There is disclosed a method and a device for managing a transmission medium shared between a set of wireless network devices which comprises a plurality of stations and a Radio Resource Management (RRM) unit. The method is based on a time division scheme carried out by said RRM unit. Time is divided in a series of Frame Time Intervals (FTIs), which are split into a given number n of Time Intervals (TIs), each TI having a respective duration (D). The ownership of each TI is dedicated to a group of TI owner devices (TOG), selected among the set of devices. Each TOG comprises a given number k of transmitting devices, which are allowed to transmit over the transmission medium during the TI considered, and a given number m of receiving devices, which listen to the transmission medium during this TI, where m and k are strictly positive integer. ## Claims ### Claim 1 A method for managing a transmission medium shared between a set of wireless network devices comprising a plurality of stations and a Radio Resource Management (RRM) unit, said method being based on a time division scheme carried out by said RRM unit and comprising steps of: said RRM unit providing a series of Frame Time Intervals (FTIs); splitting each FTI into a give number n of Time Intervals (TIs), each having a respective duration (D), where n is a give integer; and dedicating the ownership of at least one TI to a group of TI owner devices (TOG) selected among said set of devices, said TOG comprising a given number k of transmitting devices, which are allowed to transmit over said transmission medium during said TI and a given number m of receiving devices, which listen to said transmission medium during said TI, where m and k may take any strictly positive integer values, wherein the number n of TIs in on FTI, and the respective duration and TOG of each of said n TIs are determined dynamically on a per FTI basis by the RRM unit, and the RRM unit determines the number n of TIs, and the respective duration and TOG of each one of said n TIs on the basis of information received from the respective stations. ### Claim 2 (depends on 1) The method of claim 1, wherein the RRM unit is embodied in at least one of the plurality of stations. ### Claim 3 (depends on 1) The method of claim 1, wherein all FTIs have the same duration. ### Claim 4 (depends on 1) The method of claim 1, wherein at least one of the TIs is a Contention TI (CTI), and wherein the TOG of said CTI comprises the plurality of stations as transmitting devices and the RRM unit as receiving device. ### Claim 5 (depends on 4) The method of claim 4, wherein all the CTIs have the same duration. ### Claim 6 (depends on 5) The method of claim 5, wherein at least one FTI comprises several CTIs which are grouped into a CTI Block. ### Claim 7 (depends on 1) The method of claim 1, wherein the first TI of at least one FTI is a Signalling TI (STI), and wherein the TOG of said STI comprises the RRM unit as transmitting device and the plurality of stations as receiving devices, and wherein said STI comprises description of n−1 subsequent TIs. ### Claim 8 (depends on 1) The method of claim 1, wherein a MAC packet of a MAC protocol is transmitted during any given TI in any FTI, each MAC packet being of variable length and including a Signalling part which comprises: a MAC packet header, a Signalling length field containing information which describes the length of the Signalling part, a given number p of Signalling Information Elements (SIEs) of variable length, where p is an integer depending on each said MAC packet. ### Claim 9 (depends on 8) The method of claim 8, wherein the MAC packet transmitted in the STI contains TI Descriptor SIEs (TID-SIEs), each TID-SIE respectively describing one of the n−1 subsequent TIs, namely its duration, its location within the FTI, and its TOG via respective identifiers of the k transmitting devices and respective identifiers of the m receiving devices. ### Claim 10 (depends on 6, 8) The method of claim 6 or 8, wherein the MAC packet transmitted in the STI of a FTI including a CTI Block comprises a CTI Block Descriptor SIE (CBD-SIE) for describing said CTI Block, which CBD-SIE comprises the location of said CTI Block within the ETI and the number of CTIs in said CTI Block. ### Claim 11 (depends on 10) The method of claim 10, wherein the MAC packet transmitted in the STI further comprises a CTI Block Acknowledgement Descriptor SIE (CBA-SIE), said CBA-SIE including an acknowledgement by the RRM unit associated to each CTI of the CTI Block in the previous FTI. ### Claim 12 (depends on 8) The method of claim 8, wherein the MAC packet further comprises a Data part with a corresponding specific Data Part Descriptor SIE (DPD-SIE), said Data part including one or more Data Blocks, each one of said Data Blocks being intended for at least one receiving device of the TOG of said TI, which device being determined via information comprised in said DPD-SIE. ### Claim 13 (depends on 12) The method of claim 12, wherein each of the Data Blocks are encoded with different encoding parameters at MAC level and/or at PHY level. ### Claim 14 (depends on 8) The method of claim 8, wherein the MAC packet includes a CRC code, which is computed on the Signalling part. ### Claim 15 (depends on 8) The method of claim 8, wherein the RRM unit determines the duration of a TI based on the size of the MAC packet which will be transmitted during said TI. ### Claim 16 (depends on 4, 8) The method of claim 4 or claim 8, wherein only one MAC packet, which comprises exclusively the Signalling part, is transmitted during a CTI. ### Claim 17 (depends on 1) The method of claim 1, wherein at least one device handles several Physical Layer channels, and wherein the RRM unit dedicates TIs over said Physical Layer channels by applying the following steps: dedicating each of said Physical Layer channels to a sub group of stations selected according to the Physical Layer channels they are able to support, carrying out the method on each Physical Layer channel. ### Claim 18 A method for managing a transmission medium shared between a set of wireless network devices comprising a plurality of stations and a Radio Resource Management (RRM) unit based on a time division scheme carried out by said RRM unit, wherein said set of devices comprises at least one subset of devices including a Local RRM (L-RRM) unit, said method comprising the steps of: said RRM unit providing a series of Frame Time Intervals (FTIs), splitting each FTI into a given number n of Time Intervals (TIs), each having a respective duration (D), where n is a given integer; dedicating at least one TI to only said L-RRM unit (L-RRM TI); splitting said L-RRM TI into q Local TIs (L-TIs), each having a respective duration, where q is a given integer; and dedicating the ownership of at least one L-TI to a group of L-TI owner devices (L-TOG) selected among said subset of devices, said L-TOG comprising a given number r of transmitting devices, which are allowed to transmit over said transmission medium during said L-TI and a given number of s of receiving devices, which listen to said transmission medium during said L-TI, where r and s are strictly positive integers, wherein the number q of L-TIs in a given L-RRM TI, and the respective duration and L-TOG of each one of said q L-TIs are determined dynamically by the L-RRM unit. ### Claim 19 (depends on 18) The method of claim 18 further comprising the step of: dedicating the ownership of at least an other one TI to a group of TI owner devices (TOG) selected among said set of devices, said TOG comprising a given number k of transmitting devices, which are allowed to transmit over said transmission medium during said TI and a given number m of receiving devices, which listen to said transmission medium during said TI, where m and k are strictly positive integers. ### Claim 20 (depends on 18) The method of claim 18, wherein the L-RRM unit determines the number q of L-TIs, and the respective duration and L-TOG of each one of said q L-TIs on the basis of information received from the respective stations. ### Claim 21 (depends on 18) The method of claim 18, wherein at least one of the L-TIs is a Local Contention TI (L-CTI), and wherein the L-TOG of said L-TI comprises the subset of devices as transmitting devices and the L-RRM unit as receiving device. ### Claim 22 (depends on 21) The method of claim 21, wherein all the L-CTIs have the same duration. ### Claim 23 (depends on 22) The method of claim 22, wherein at least one L-RRM TI comprises several L-CTIs which are grouped into a L-CTJ Block. ### Claim 24 (depends on 18) The method of claim 18, wherein the first L-TI in the L-RRM TI is a Signalling L-TI (SL-TI), and wherein the L-TOG comprises the L-RRM unit as transmitting device and the subset of devices as receiving devices, and wherein said SL-TI comprises description of q-1 subsequent L-TIs. ### Claim 25 (depends on 18) The method of claim 18, wherein a MAC packet of a MAC protocol is transmitted during any given L-TI in any L-RRM TI, each MAC packet being of variable length and including a Signalling part which comprises: a MAC packet header, a Signalling length field containing information which describes the length of the Signalling part, a given number p of Signalling Information Elements (SIEs) of variable length, where p is an integer depending on each said MAC packet. ### Claim 26 (depends on 25) The method of claim 25, wherein the MAC packet transmitted in the SL-TI contains L-TI Descriptor SIEs (L-TID-SIEs), each L-TID-SIE respectively describing one of the q-1 subsequent L-TIs, namely its duration, its location within the L-RRM TI, and its L-TOG via respective identifiers of the r transmitting devices and respective identifiers of the s receiving devices. ### Claim 27 (depends on 23, 25) The method of claim 23 or 25, wherein the MAC packet transmitted in the SL-TI of a L-RRM TI including a L-CTI Block comprises a L-CTI Block Descriptor SIE (L-CBD-SIE) for describing said L-CTI Block, which L-CBD-SIE comprises the location of said L-CTI Block within the L-RRM TI and the number of L-CTIs in said L-CTI Block. ### Claim 28 (depends on 27) The method of claim 27, wherein the MAC packet transmitted in the SL-TI further comprises a L-CTI Block Acknowledgement Descriptor SIE (L-CBA-SIE), said L-CBA-SIE comprising an acknowledgement by the L-RRM unit associated to each L-CTI of the L-CTI Block in the previous L-RRM TI. ### Claim 29 (depends on 25) The method of claim 25, wherein the MAC packet further comprises a Data part with a corresponding specific Data Part Descriptor SIE (DPD-SIE), said Data part including one or more Data Blocks, each one of said Data Blocks being intended for at least one receiving device of the L-TOG of said L-TI, including SL-TI, which device being determined via information comprised in said DPD-SIE, wherein each of the Data Blocks are encoded with different encoding parameters at MAC level and/or at PHY level. ### Claim 30 (depends on 25) The method of claim 25, wherein the MAC packet includes a CRC code, which is computed on the Signalling part. ### Claim 31 (depends on 18) The method of claim 18, wherein at least one device handles several Physical Layer channels, and wherein the L-RRM unit dedicates L-TIs over said Physical Layer channels by applying the following steps: dedicating each of said Physical Layer channels to a sub group of stations selected according to the Physical Layer channels they are able to support, carrying out the method on each Physical Layer channel.