# US 2014/0192659 A1 · Multiple access scheme for multi-channels of a network with a limited link budget > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192659 A1 - Document ID: US20140192659A1 - Status: Published application - Kind: A1 - Application number: 13/734,942 - Filed: 2013-01-05 - Published: 2014-07-10 - Earliest claimed: 2013-01-05 - Assignees: QUALCOMM Incorporated - Applicants: Qualcomm Incorporated - Inventors: Bin Tian; Alok K. Gupta - Web page: https://patentgrep.com/patent/US20140192659A1 ## CPC - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 72/54: based on quality criteria - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods, systems, and devices are described for managing wireless communications in a machine-to-machine (M2M) wireless Wide Area Network (WAN). An operating frequency band of the M2M wireless WAN is divided into at least a first frequency channel and a second frequency channel. The first and second frequency channels being used for communications on a reverse link. A first rise over thermal (RoT) threshold is set for the first frequency channel. A second RoT threshold is set for the second frequency channel. The second RoT threshold is lower than the first RoT threshold. ## Claims ### Claim 1 A method for wireless communication in a machine-to-machine (M2M) wireless Wide Area Network (WAN), comprising: dividing an operating frequency band of the M2M wireless WAN into at least a first frequency channel and a second frequency channel, the first and second frequency channels being used for communications on a reverse link; setting a first rise over thermal (RoT) threshold for the first frequency channel; and setting a second RoT threshold for the second frequency channel, the second RoT threshold being lower than the first RoT threshold. ### Claim 2 (depends on 1) The method of claim 1, further comprising: identifying a first group of one or more M2M devices, from a plurality of M2M devices, to transmit on the reverse link using the first frequency channel; and identifying a second group of one or more M2M devices, from the plurality of M2M devices, to transmit on the reverse link using the second frequency channel. ### Claim 3 (depends on 2) The method of claim 2, further comprising: broadcasting a channel assignment message to the first group and second group of M2M devices, the channel assignment message informing the first group of one or more M2M devices to transmit on the reverse link using the first frequency channel, and the channel assignment message informing the second group of one or more M2M devices to transmit on the reverse link using the second frequency channel. ### Claim 4 (depends on 2) The method of claim 2, wherein identifying the first group and second group of one or more M2M devices comprises: identifying one or more M2M devices, from the plurality of M2M devices, located within a first geographical area; and identifying one or more M2M devices, from the plurality of M2M devices, located within a second geographical area. ### Claim 5 (depends on 4) The method of claim 4, further comprising: assigning the one or more M2M devices located within the first geographical area to the first frequency channel with the first RoT threshold; and assigning the one or more M2M devices located within the second geographical area to the second frequency channel with the second RoT threshold, the second geographical area having a greater path loss from a device communicating with the M2M devices on a forward link than the first geographical area. ### Claim 6 (depends on 2) The method of claim 2, wherein identifying the first group and second group of one or more M2M devices comprises: identifying one or more M2M devices, from the plurality of M2M devices, that have previously transmitted on the reverse link at a data rate that satisfies a data rate threshold; and identifying one or more M2M devices, from the plurality of M2M devices, that have previously transmitted on the reverse link at a data rate that fails to satisfy the data rate threshold. ### Claim 7 (depends on 6) The method of claim 6, further comprising: assigning the one or more M2M devices that have previously transmitted on the reverse link at a data rate that satisfies the data rate threshold to the first frequency channel with the first RoT threshold; and assigning the one or more M2M devices that have previously transmitted on the reverse link at a data rate that fails to satisfy the data rate threshold to the second frequency channel with the second RoT threshold. ### Claim 8 (depends on 2) The method of claim 2, wherein identifying the first group and second group of one or more M2M devices comprises: estimating a strength of a forward link received at one or more of the M2M devices of the plurality of M2M device. ### Claim 9 (depends on 8) The method of claim 8, further comprising: assigning the first group of one or more M2M devices to the first frequency channel with the first RoT threshold; and assigning the second group of one or more M2M devices to the second frequency channel with the second RoT threshold, the estimated strength of the forward link received at the second group being lower than the estimated strength of the forward link received at the first group. ### Claim 10 (depends on 1) The method of claim 1, further comprising: determining whether to adjust the first or second RoT thresholds for the first or second frequency channels. ### Claim 11 (depends on 10) The method of claim 10, wherein the determination to adjust the first or second RoT thresholds is based at least in part on a change of a number of M2M devices using the first or second frequency channels to communicate on the reverse link. ### Claim 12 (depends on 11) The method of claim 11, further comprising: dynamically lowering the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has decreased. ### Claim 13 (depends on 11) The method of claim 11, further comprising: dynamically increasing the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has increased. ### Claim 14 (depends on 1) The method of claim 1, further comprising: implementing code division multiple access (CDMA) for communications on the reverse link using the first and second frequency channels. ### Claim 15 (depends on 1) The method of claim 1, wherein a RoT threshold represents a quantity of signal interference on a frequency channel that is above a thermal noise of the frequency channel. ### Claim 16 A base station configured for wireless communication in a machine-to-machine (M2M) wireless Wide Area Network (WAN), comprising: a processor; memory in electronic communication with the processor; and instructions being stored in the memory, the instructions being executable by the processor to: divide an operating frequency band of the M2M wireless WAN into at least a first frequency channel and a second frequency channel, the first and second frequency channels being used for communications on a reverse link; set a first rise over thermal (RoT) threshold for the first frequency channel; and set a second RoT threshold for the second frequency channel, the second RoT threshold being lower than the first RoT threshold. ### Claim 17 (depends on 16) The base station of claim 16, wherein the instructions are further executable by the processor to: broadcast a channel assignment message to the first group and second group of M2M devices, the channel assignment message informing the first group of one or more M2M devices to transmit on the reverse link using the first frequency channel, and the channel assignment message informing the second group of one or more M2M devices to transmit on the reverse link using the second frequency channel. ### Claim 18 (depends on 16) The base station of claim 16, wherein the instructions are further executable by the processor to: determine whether to adjust the first or second RoT thresholds for the first or second frequency channels. ### Claim 19 (depends on 18) The base station of claim 18, wherein the determination to adjust the first or second RoT thresholds is based at least in part on a change of a number of M2M devices using the first or second frequency channels to communicate on the reverse link. ### Claim 20 (depends on 19) The base station of claim 19, wherein the instructions are further executable by the processor to: dynamically lower the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has decreased. ### Claim 21 (depends on 19) The base station of claim 19, wherein the instructions are further executable by the processor to: dynamically increase the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has increased. ### Claim 22 (depends on 16) The base station of claim 16, wherein the instructions are further executable by the processor to: implement code division multiple access (CDMA) for communications on the reverse link using the first and second frequency channels. ### Claim 23 (depends on 16) The base station of claim 16, wherein a RoT threshold represents a quantity of signal interference on a frequency channel that is above a thermal noise of the frequency channel. ### Claim 24 An apparatus configured for wireless communication in a machine-to-machine (M2M) wireless Wide Area Network (WAN), comprising: means for dividing an operating frequency band of the M2M wireless WAN into at least a first frequency channel and a second frequency channel, the first and second frequency channels being used for communications on a reverse link; means for setting a first rise over thermal (RoT) threshold for the first frequency channel; and means for setting a second RoT threshold for the second frequency channel, the second RoT threshold being lower than the first RoT threshold. ### Claim 25 (depends on 24) The apparatus of claim 24, further comprising: means for broadcasting a channel assignment message to the first group and second group of M2M devices, the channel assignment message informing the first group of one or more M2M devices to transmit on the reverse link using the first frequency channel, and the channel assignment message informing the second group of one or more M2M devices to transmit on the reverse link using the second frequency channel. ### Claim 26 (depends on 24) The apparatus of claim 24, further comprising: means for determining whether to adjust the first or second RoT thresholds for the first or second frequency channels. ### Claim 27 (depends on 26) The apparatus of claim 26, wherein the determination to adjust the first or second RoT thresholds is based at least in part on a change of a number of M2M devices using the first or second frequency channels to communicate on the reverse link. ### Claim 28 (depends on 27) The apparatus of claim 27, further comprising: means for dynamically lowering the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has decreased. ### Claim 29 (depends on 27) The apparatus of claim 27, further comprising: means for dynamically increasing the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has increased. ### Claim 30 A computer program product for managing wireless communication in a machine-to-machine (M2M) wireless Wide Area Network (WAN), the computer program product comprising a non-transitory computer-readable medium storing instructions executable by the processor to: divide an operating frequency band of the M2M wireless WAN into at least a first frequency channel and a second frequency channel, the first and second frequency channels being used for communications on a reverse link; set a first rise over thermal (RoT) threshold for the first frequency channel; and set a second RoT threshold for the second frequency channel, the second RoT threshold being lower than the first RoT threshold. ### Claim 31 (depends on 30) The computer program product of claim 30, wherein the instructions are further executable by the processor to: broadcast a channel assignment message to the first group and second group of M2M devices, the channel assignment message informing the first group of one or more M2M devices to transmit on the reverse link using the first frequency channel, and the channel assignment message informing the second group of one or more M2M devices to transmit on the reverse link using the second frequency channel. ### Claim 32 (depends on 30) The computer program product of claim 30, wherein the instructions are further executable by the processor to: determine whether to adjust the first or second RoT thresholds for the first or second frequency channels. ### Claim 33 (depends on 32) The computer program product of claim 32, wherein the determination to adjust the first or second RoT thresholds is based at least in part on a change of a number of M2M devices using the first or second frequency channels to communicate on the reverse link. ### Claim 34 (depends on 33) The computer program product of claim 33, wherein the instructions are further executable by the processor to: dynamically lower the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has decreased. ### Claim 35 (depends on 33) The computer program product of claim 33, wherein the instructions are further executable by the processor to: dynamically increase the first RoT threshold of the first frequency channel upon determining the number of M2M devices using the first frequency channel has increased. ### Claim 36 A method for wireless communication on a reverse link in a machine-to-machine (M2M) wireless Wide Area Network (WAN), comprising: identifying a first frequency channel and a second frequency channel to use for communications on the reverse link, the first frequency channel comprising a first rise over thermal (RoT) threshold, the second frequency channel comprising a second RoT threshold, wherein the second RoT threshold is lower than the first RoT threshold; and communicating on the reverse link using the first frequency channel or the second frequency channel. ### Claim 37 (depends on 36) The method of claim 36, further comprising: receiving a broadcast of a channel assignment message, the message indicating whether to use the first frequency channel or the second frequency channel for communications on the reverse link. ### Claim 38 (depends on 36) The method of claim 36, further comprising: selecting the first frequency channel or the second frequency channel to use for communications on the reverse link. ### Claim 39 (depends on 38) The method of claim 38, wherein selecting the first or second frequency channel comprises: transmitting data at a first data rate using the first frequency channel; monitoring for an acknowledgment (ACK) message indicating successful transmission of the data at the first data rate; upon failing to receive the ACK message, retransmitting the data at a second data rate using the second frequency channel, the second data rate being lower than the first data rate. ### Claim 40 (depends on 38) The method of claim 38, wherein selecting the first or second frequency channel comprises: estimating a signal strength of a forward link originating from a base station; selecting the first frequency channel or the second frequency channel based at least in part on the estimated signal strength of the forward link. ### Claim 41 (depends on 38) The method of claim 38, wherein selecting the first or second frequency channel comprises: receiving a frequency channel capacity message, the message indicating an available capacity for the first frequency channel and the second frequency channel; and selecting the first frequency channel or the second frequency channel based at least in part on the available capacity of each channel indicated by the message.