OFDMA cellular network and method for mitigating interference
First Claim
1. A serving base station configured to mitigate uplink interference with neighbor base stations in an orthogonal frequency division multiple access (OFDMA) cellular network by coordination of uplink zone assignments, the serving base station comprising a scheduler configured to:
- receive scan reports from associated mobile stations identifying one or more interference sources;
assign a common group identifier (ID) to mobile stations having a common interference source based on interference levels of the common interference source;
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allocate bandwidth within a selected zone of an OFDMA uplink subframe to the mobile stations assigned the common group ID for uplink communications with the serving base station within the uplink subframe, the selected zone being one of a plurality of orthogonal zones of the OFDMA uplink subframe and within the selected zone the allocated bandwidth comprises an orthogonal channel resource in time and frequency that is allocated to each of the mobile stations having the common group ID for uplink communications within the OFDMA uplink subframe,provide, when a neighbor base station is identified as the common interference source, a report to inform the neighbor base station of the selected zone assignment to cause the neighbor base station to refrain from assigning bandwidth within the selected zone to at least some of its associated mobile stations that have identified the serving base station as an interference source; and
initiate transmission of a group ID broadcast message using the assigned common group ID to inform the mobile stations having the assigned common group ID of power control and zone assignment for uplink communications,wherein the serving base station and neighbor base station are configured to time-synchronize their OFDMA frames, and the scheduler comprises one or more processor.
1 Assignment
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Accused Products
Abstract
Embodiments of an OFDMA cellular network and method for mitigating interference are generally described herein. In some embodiments, the scheduler assigns a common group ID to mobile stations based on interference levels of a common interference source and allocates bandwidth within a selected zone of an OFDMA uplink subframe to the mobile stations assigned the common group ID for uplink communications within the uplink subframe. In some joint-scheduling embodiments, a neighbor base station that is identified as the common interference source may refrain from assigning bandwidth within the selected zone to at least some of its associated mobile stations that have identified the serving base station as an interference source.
18 Citations
16 Claims
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1. A serving base station configured to mitigate uplink interference with neighbor base stations in an orthogonal frequency division multiple access (OFDMA) cellular network by coordination of uplink zone assignments, the serving base station comprising a scheduler configured to:
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receive scan reports from associated mobile stations identifying one or more interference sources; assign a common group identifier (ID) to mobile stations having a common interference source based on interference levels of the common interference source;
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allocate bandwidth within a selected zone of an OFDMA uplink subframe to the mobile stations assigned the common group ID for uplink communications with the serving base station within the uplink subframe, the selected zone being one of a plurality of orthogonal zones of the OFDMA uplink subframe and within the selected zone the allocated bandwidth comprises an orthogonal channel resource in time and frequency that is allocated to each of the mobile stations having the common group ID for uplink communications within the OFDMA uplink subframe,provide, when a neighbor base station is identified as the common interference source, a report to inform the neighbor base station of the selected zone assignment to cause the neighbor base station to refrain from assigning bandwidth within the selected zone to at least some of its associated mobile stations that have identified the serving base station as an interference source; and initiate transmission of a group ID broadcast message using the assigned common group ID to inform the mobile stations having the assigned common group ID of power control and zone assignment for uplink communications, wherein the serving base station and neighbor base station are configured to time-synchronize their OFDMA frames, and the scheduler comprises one or more processor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A base station configured to mitigate uplink interference in an orthogonal frequency division multiple access (OFDMA) cellular network, the base station comprising a scheduler configured to:
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assign a common group identifier (ID) to mobile stations based on interference levels of a common interference source; allocate bandwidth within a selected zone of an OFDMA uplink subframe to the mobile stations assigned the common group ID for uplink communications with the base station within the uplink subframe, receive scan reports from associated mobile stations identifying one or more interference sources and the interference level associated with at least one of the interference sources;
identify common interference sources based on an identity of the interference sources from the scan reports, assign a common group ID to mobile stations with a common interference source when the interference level of the common interference source is above a predetermined threshold, wherein a neighbor base station that is identified as the common interference source is configured to refrain from assigning bandwidth within the selected zone to at least some of its associated mobile stations that have identified the serving base station as an interference source,wherein the scheduler is configured to refrain from assigning a common group ID to mobile stations that do not have an interference level of a common interference source above the predetermined threshold, and wherein the scheduler is further configured to allocate bandwidth to mobile stations that do not have an interference level of a common interference source above the predetermined threshold from portions of the uplink subframe that is not within the selected zone, and the scheduler comprises one or more processor.
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8. A base station configured to mitigate uplink interference in an orthogonal frequency division multiple access (OFDMA) cellular network, the base station comprising a scheduler configured to:
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assign a common group identifier (ID) to mobile stations based on interference levels of a common interference source;
allocate bandwidth within a selected zone of an OFDMA uplink subframe to the mobile stations assigned the common group ID for uplink communications with the base station within the uplink subframe,receive scan reports from associated mobile stations identifying one or more interference sources and the interference level associated with at least one of the interference sources;
identify common interference sources based on an identity of the interference sources from the scan reports, assign a common group ID to mobile stations with a common interference source when the interference level of the common interference source is above a predetermined threshold,wherein a neighbor base station that is identified as the common interference source is configured to refrain from assigning bandwidth within the selected zone to at least some of its associated mobile stations that have identified the serving base station as an interference source, wherein the base station is a serving base station, wherein the scheduler is further configured to generate interference reports for transmission to a neighbor base station identified as common interference sources, and wherein the interference report identifies the selected zone of the OFDMA uplink subframe that the serving base station has assigned to mobile stations that have identified the neighbor base station as the common interference source, and the scheduler comprises one or more processor. - View Dependent Claims (9, 10)
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11. A scheduler to operate in an orthogonal frequency division multiple access (OFDMA) cellular network configured to:
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receive interference reports at a serving base station from mobile stations identifying interference sources;
assign a common group identifier (ID) to mobile stations having a common interference source based on interference levels of the common interference source;
allocate bandwidth within a selected zone of an OFDMA uplink subframe to the mobile stations assigned the common group ID for uplink communications with the serving base station within the uplink subframe, the selected zone being one of a plurality of orthogonal zones of the OFDMA uplink subframe and within the selected zone the allocated bandwidth comprises an orthogonal channel resource in time and frequency that is allocated to each of the mobile stations having the common group ID for uplink communications within the OFDMA uplink subframe, provide, when a neighbor base station is identified as the common interference source, a report to inform the neighbor base station of the selected zone assignment to cause the neighbor base station to refrain from assigning bandwidth within the selected zone to at least some of its associated mobile stations that have identified the serving base station as an interference source;
initiate transmission of a group ID broadcast message using the assigned common group ID to inform the mobile stations having the assigned common group ID of power control and zone assignment for uplink communications,wherein the serving base station and neighbor base station are configured to time-synchronize their OFDMA frames, and the scheduler comprises one or more processor. - View Dependent Claims (12, 13)
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14. A method of scheduling uplink communications in an OFDMA cellular network, the method comprising:
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receiving scan reports from associated mobile stations identifying one or more interference sources assigning a common group identifier (ID) by a serving base station to mobile stations having a common interference source based on interference levels of the common interference source; allocating bandwidth within a selected zone of an OFDMA uplink subframe to the mobile stations assigned the common group ID for uplink communications with the base station within the uplink subframe, the selected zone being one of a plurality of orthogonal zones of the OFDMA uplink subframe and within the selected zone the allocated bandwidth comprises an orthogonal channel resource in time and frequency that is allocated to each of the mobile stations having the common group ID for uplink communications within the OFDMA uplink subframe, providing, when a neighbor base station is identified as the common interference source, a report to inform the neighbor base station of the selected zone assignment to cause the neighbor base station to refrain from assigning bandwidth within the selected zone to at least some of its associated mobile stations that have identified the serving base station as an interference source; transmitting a group ID broadcast message using the assigned common group ID to inform the mobile stations having the assigned common group ID of power control and zone assignment for uplink communications, wherein the serving base station and neighbor base station are configured to time-synchronize their OFDMA frames. - View Dependent Claims (15, 16)
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Specification