Dynamic random access resource size configuration and selection
First Claim
1. A method in a wireless device configured for operation in a wireless network, the method comprising the steps:
- receiving information from a radio network node comprised in a cell of the wireless network, wherein the received information indicates random access resources of different sizes configured for use in the cell of said wireless network;
selecting, for use in transmitting a random access message for the radio network node, a smallest-sized one of said random access resources calculated to satisfy a target uplink received energy at the radio network node, in view of a transmit power limit of the wireless device and an estimate of path loss between the wireless device and the radio network node; and
transmitting the random access message using the selected random access resource.
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Abstract
The disclosure relates to connection setup between a wireless device and a mobile communication network using random access, and more specifically to dynamic random access resource configuration and selection. The disclosure provides for a method in a wireless device, of selecting random access resources for performing a random access procedure to a wireless network. The method comprises the step receiving information from a radio network node comprised in a cell of the wireless network, wherein the received information indicates at least a first and a second random access resource having different resource sizes. The method further comprises selecting one of said at least first and a second random access resources based on an expected uplink power received by the radio network node and transmitting a random access message to said wireless network using the selected resource. The disclosure further relates to methods for providing random access resources, as well as to a wireless device, and to radio network nodes of a wireless network.
7 Citations
18 Claims
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1. A method in a wireless device configured for operation in a wireless network, the method comprising the steps:
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receiving information from a radio network node comprised in a cell of the wireless network, wherein the received information indicates random access resources of different sizes configured for use in the cell of said wireless network; selecting, for use in transmitting a random access message for the radio network node, a smallest-sized one of said random access resources calculated to satisfy a target uplink received energy at the radio network node, in view of a transmit power limit of the wireless device and an estimate of path loss between the wireless device and the radio network node; and transmitting the random access message using the selected random access resource. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory computer-readable medium storing a computer program that, when executed by processing circuitry of a wireless device configured for operation in a wireless network, configures the wireless device to:
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receive information from a radio network node comprised in a cell of the wireless network, wherein the received information indicates random access resources of different sizes configured for use in the cell of said wireless network; select, for use in transmitting a random access message for the radio network node, a smallest-sized one of said random access resources calculated to satisfy a target uplink received energy at the radio network node, in view of a transmit power limit of the wireless device and an estimate of path loss between the wireless device and the radio network node; and transmit the random access message using the selected random access resource.
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9. A wireless device configured for operation in a wireless network and comprising:
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a network communication transceiver configured to communicate with a radio network node in a cell of said wireless network, a processor; and a memory storing computer program code which, when run in said processor, causes the wireless device to; receive information from said radio network node using said network communication transceiver, wherein the received information indicates random access resources of different sizes configured for use in the cell; select, for use in transmitting a random access message for the radio network node, a smallest-sized one of said random access resources that satisfies a target uplink received energy at the radio network node, in view of a transmit power limit of the wireless device and an estimate of path loss between the wireless device and the radio network node; and transmit the random access message using the selected random access resource.
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10. A method performed in a radio network node in a wireless network, said method comprising the steps:
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configuring random access resources of different sizes for use in a cell associated with the radio network node according to an arrangement whereby random access resources having dissimilar sizes do not overlap in time or frequency, the different sizes corresponding to different ranges of expected uplink received power at the radio network node; and transmitting configuration information indicating the random access resources, thereby enabling one or more wireless devices operating in the cell to transmit random access messages for the radio network node using selected ones of the random access resources. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A non-transitory computer-readable medium storing a computer program comprising program instructions that, when executed by processing circuitry of a radio network node configured for operation in a wireless network, configure the radio network node to:
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configure random access resources of different sizes for use in a cell associated with the radio network node according to an arrangement whereby random access resources having dissimilar sizes do not overlap in time or frequency, the different sizes corresponding to different ranges of expected uplink received power at the radio network node; and transmit configuration information indicating the random access resources, thereby enabling one or more wireless devices operating in the cell to transmit random access messages for the radio network node using selected ones of the random access resources.
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17. A radio network node configured for operation in a cell of a wireless network, said radio network node comprising:
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a processor; and a memory storing computer program code which, when run in the processor, causes the radio network node to; configure random access resources of different sizes for use in a cell associated with the radio network node according to an arrangement whereby random access resources having dissimilar sizes do not overlap in time or frequency, the different sizes corresponding to different ranges of expected uplink received power at the radio network node; and transmit configuration information indicating the random access resources, thereby enabling one or more wireless devices operating in the cell to transmit random access messages for the radio network node using selected ones of the random access resources.
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18. A method at a wireless device configured for operation in a wireless network, the method comprising:
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with respect to two or more differently-sized random access resources configured for use in attempting random access towards a radio network node of the wireless network, selecting the smallest-sized one of the two or more random access resources that is calculated to satisfy a target uplink received energy at the radio network node, in view of a transmit power limit of the wireless device and an estimate of path loss between the wireless device and the radio network node; and transmitting a random access message using the selected random access resource.
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Specification