SMALL CELL UPLINK INTERFERENCE MITIGATION
First Claim
1. A method for identifying a user device being served by a first base station of a cellular network and causing radio interference in the uplink of a second base station, the method comprising, by the first base station:
- transmitting configuration information for the first base station to the second base station, wherein the configuration information comprises an identification of one or more resources allocated to an uplink channel of the first base station;
receiving an interference indication message from the second base station, the interference indication message comprising an indication that a cell of the second base station is experiencing uplink interference from at least one interfering user device;
for each of a plurality of user devices being served by the first as station, assigning a preamble to the user device;
transmitting the preambles assigned to the plurality of user devices to the second base station;
for each of the plurality of user devices, transmitting a message comprising the preamble, assigned to the user device, to the user device;
receiving an information element from the second base station, wherein the information element comprises a list of one or more preambles which were detected at the second base station, on an uplink channel, from one or more preamble transmissions of one or more of the plurality of user devices; and
identifying the at least one interfering user device based, at least in part, on the list of preambles.
1 Assignment
0 Petitions
Accused Products
Abstract
Identifying a interfering, candidate or suspect of interfering (interferer) user device, UE, being served by a first base station (macro eNB) and causing uplink interference on a second base station (small cell). The first base station (macro eNB) transmits uplink channel configuration information (PRACH configuration info) to the second base station (small cell). The first base station (macro eNB) receives an Interference indication message, comprising an indication that a cell of the second base station (small cell) is experiencing uplink interference form at least one user device. For each of a plurality of user devices being served by the first base station (macro eNB), the first base station (macro eNB), assigns a preamble to the user device, UE, and transmits the assigned preamble to the user device, UE. The first base station (macro eNB) also transmits the assigned preambles to the second base station (small cell). The first base station (macro eNB) then receives a list of preambles detected at the second base station, and identifies the at least one interfering user device, UE, based on the received list.
99 Citations
30 Claims
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1. A method for identifying a user device being served by a first base station of a cellular network and causing radio interference in the uplink of a second base station, the method comprising, by the first base station:
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transmitting configuration information for the first base station to the second base station, wherein the configuration information comprises an identification of one or more resources allocated to an uplink channel of the first base station; receiving an interference indication message from the second base station, the interference indication message comprising an indication that a cell of the second base station is experiencing uplink interference from at least one interfering user device; for each of a plurality of user devices being served by the first as station, assigning a preamble to the user device; transmitting the preambles assigned to the plurality of user devices to the second base station; for each of the plurality of user devices, transmitting a message comprising the preamble, assigned to the user device, to the user device; receiving an information element from the second base station, wherein the information element comprises a list of one or more preambles which were detected at the second base station, on an uplink channel, from one or more preamble transmissions of one or more of the plurality of user devices; and identifying the at least one interfering user device based, at least in part, on the list of preambles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for mitigating interference at a base station of a cellular network by identifying an interfering user device, the system comprising a first base station configured to:
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transmit configuration information for the first base station to a second base station, wherein the configuration information comprises an identification of one or more resources allocated an uplink channel of the first base station; receive an interference indication message from the second base station, the interference indication message comprising an indication that a cell of the second base station is experiencing uplink interference from at least one interfering user device; for each of a plurality of user devices being served by the first base station, assign a preamble to the user device; transmit the preambles assigned to the plurality of user devices to the second base station; for each of the plurality of user devices, transmit a message comprising the preamble, assigned to the user device, to the user device; receive an information element from the second base station, wherein the information element comprises a list of one or more preambles which were detected at the second base station, on an uplink channel, from one or more preamble transmissions of one or more of the plurality of user devices; and identify the at least one interfering user device based, at least in part, on the list of preambles. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification