METHOD AND SYSTEM FOR RANDOM ACCESS INTERFERENCE MITIGATION IN HETEROGENEOUS CELLULAR NETWORKS
First Claim
1. A method at a user equipment operating in a wireless network having a plurality of access nodes comprising a first access node and at least one low power access node having lower transmit power than the first access node, wherein the user equipment is configured to receive stronger downlink signals from the first access node than from the at least one low power access node, the method comprising:
- determining, by the user equipment, whether a low power access node is better for uplink data transmission than the first access node; and
if the low power access node is better for uplink data transmission, sending from the user equipment to the low power access node, a random access preamble directed to the first access node.
7 Assignments
0 Petitions
Accused Products
Abstract
Methods and systems at a user equipment, low power access node and first access node operating in a wireless network having a plurality of access nodes comprising a first access node and at least one low power access node having lower transmit power than the first access node, wherein the user equipment receives stronger downlink signals from the first access node than from the at least one low power access node, the method at the user equipment determining, by the user equipment, whether a low power access node is better for uplink data transmission than the first access node; and if the low power access node is better for uplink data transmission, sending from the user equipment to the low power access node, a random access preamble directed to the first access node.
71 Citations
50 Claims
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1. A method at a user equipment operating in a wireless network having a plurality of access nodes comprising a first access node and at least one low power access node having lower transmit power than the first access node, wherein the user equipment is configured to receive stronger downlink signals from the first access node than from the at least one low power access node, the method comprising:
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determining, by the user equipment, whether a low power access node is better for uplink data transmission than the first access node; and if the low power access node is better for uplink data transmission, sending from the user equipment to the low power access node, a random access preamble directed to the first access node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
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10. (canceled)
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12. A user equipment operating in a wireless network having a plurality of access nodes comprising a first access node and at least one low power access node having lower transmit power than the first access node, wherein the user equipment receives stronger downlink signals from the first access node than from the at least one low power access node, the user equipment comprising:
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a processor; and a communications subsystem, wherein the processor and communications subsystem cooperate to; determine whether a low power access node is better for uplink data transmission than the first access node; and if the low power access node is better for uplink data transmission, send to the low power access node, a random access preamble directed to the first access node.
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13-21. -21. (canceled)
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22. A method at a low power access node operating in a wireless network having a plurality of access nodes comprising a first access node and at least one low power access node having lower transmit power than the first access node, the method comprising:
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determining, at the low power access node, the presence of a first random access preamble configured for the first network node; and forwarding a report of the first random access preamble to the first network node. - View Dependent Claims (23, 24, 25, 26, 27)
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28. (canceled)
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29. A low power access node operating in a wireless network having a plurality of access nodes comprising a first access node and at least one low power access node having lower transmit power than the first access node, the low power access node comprising:
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a processor; and a communications subsystem, wherein the processor and communications subsystem cooperate to; determine, at the low power access node, the presence of a first random access preamble configured for the first network node; and forward a report of the first random access preamble to the first network node.
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30-35. -35. (canceled)
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36. A method at a first access node operating in a wireless network having a plurality of access nodes comprising the first access node and at least one low power access node having lower transmit power than the first access node, the method comprising:
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detecting the presence of a first preamble of a first set of random access preambles over a first set of random access opportunities; receiving at least a physical random access channel (‘
PRACH’
) detection report from at least one low power node the report containing at least one of;
a random access preamble identifier indicating a second preamble of a second set of random access preambles detected over the second preamble opportunities, a preamble resource identifier indicating the time-frequency resource over which the preamble was detected, a detected second time of arrival, a second time offset, or a second uplink power adjustment; andsending a random access response for each of at least one of the first preamble or the second preamble detected by the first access node or received in the detection report from the at least one low power access node. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A first access node operating in a wireless network having a plurality of access nodes comprising the first access node and at least one low power access node having lower transmit power than the first access node, the first access node comprising:
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a processor; and a communications subsystem, wherein the processor and communications subsystem cooperate to; detect the presence of a first preamble of a first set of random access preambles over a first set of random access opportunities; receive at least a physical random access channel (‘
PRACH’
) detection report from at least one low power node, the report containing at least one of;
a random access preamble identifier indicating a second preamble of a second set of random access preambles detected over the second preamble opportunities, a preamble resource identifier indicating the time-frequency resource over which the preamble was detected, a detected second time of arrival, a second time offset, or a second uplink power adjustment; andsend a random access response for each of at least one of the first preamble or the second preamble detected by the first access node or received in the detection report from the at least one low power access node.
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50-61. -61. (canceled)
Specification