System and method for beam-based physical random-access
First Claim
1. A method in a wireless device for performing random access to a network node, the method comprising:
- receiving a set of downlink beam-specific reference signals, BRSs, from the network node;
determining a preferred BRS based on the received signal power for each BRS of said set of downlink beam-specific reference signals (BRSs);
selecting, based on the preferred BRS, a random-access resource to be used for transmitting a random-access attempt to the network node according to one or more pre-defined association rules defining an association between a random-access resource and a BRS; and
using the selected random-access resource when transmitting a random-access attempt to the network node, whereby the selection of random-access resource indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions;
wherein the random access resource comprises a random-access preamble, wherein the selecting comprises selecting from a set of preambles the random-access preamble to be used for transmitting the random-access attempt, the selecting using information that is in a look-up table, specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device, or the selecting using a function that uses the preferred BRS as an input and provides the selected random-access preamble as an output, the function being specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device.
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Abstract
A method in a wireless device for performing random access to a network node. The method comprises receiving a set of downlink beam-specific reference signals, BRS, from the network node, and determining a preferred BRS based on the received signal power for each BRS. The method also comprises selecting, based on the preferred BRS, a random-access resource to be used for transmitting a random-access attempt to the network node, as well as using the selected random-access resource when transmitting a random-access attempt to the network node, whereby the selection of random-access resource indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions.
60 Citations
21 Claims
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1. A method in a wireless device for performing random access to a network node, the method comprising:
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receiving a set of downlink beam-specific reference signals, BRSs, from the network node; determining a preferred BRS based on the received signal power for each BRS of said set of downlink beam-specific reference signals (BRSs); selecting, based on the preferred BRS, a random-access resource to be used for transmitting a random-access attempt to the network node according to one or more pre-defined association rules defining an association between a random-access resource and a BRS; and using the selected random-access resource when transmitting a random-access attempt to the network node, whereby the selection of random-access resource indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions; wherein the random access resource comprises a random-access preamble, wherein the selecting comprises selecting from a set of preambles the random-access preamble to be used for transmitting the random-access attempt, the selecting using information that is in a look-up table, specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device, or the selecting using a function that uses the preferred BRS as an input and provides the selected random-access preamble as an output, the function being specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device. - View Dependent Claims (2, 3, 4)
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5. A method in a network node for supporting random access from a wireless device, the method comprising:
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transmitting a set of downlink beam-specific reference signals, BRSs; detecting a random-access preamble in a signal received from the wireless device, said preamble detection indicating a preferred BRS of said set of downlink beam-specific reference signals (BRSs), the preferred BRS preferred by said wireless device according to one or more pre-defined association rules defining an association between a random access resource and a BRS, wherein the random-access preamble is based on information that is in a look-up table, specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device, or the selecting using a function that uses the preferred BRS as an input and provides the selected random-access preamble as an output, wherein the function is specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device; and transmitting a random-access response in a same beam, and/or beam direction, and/or with same beamforming weights, as the preferred BRS. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A wireless device configured to perform random access to a network node, the wireless device comprising:
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a processor and a memory, the memory containing instructions executable by the processor to; receive a set of downlink beam-specific reference signals, BRSs, from the network node; determine a preferred BRS based on the received signal power for each BRS of said set of downlink beam-specific reference signals (BRSs); select, based on the preferred BRS, a random-access resource to be used to transmit a random-access attempt to the network node according to one or more pre-defined association rules defining an association between a random access resource and a BRS; and use the selected random-access resource when transmitting a random-access attempt to the network node, whereby the selection of random-access resource indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions; wherein the random access resource comprises a random-access preamble to be used for transmitting the random-access attempt and wherein, to select the random-access preamble from a set of preambles, the processor is configured to use information that is in a look-up table, specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device, or the selecting using a function that uses the preferred BRS as an input and provides the selected random-access preamble as an output, wherein the function is specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device. - View Dependent Claims (12, 13, 14)
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15. A network node configured to support random access from a wireless device, the network node comprising:
a processor and a memory, the memory containing instructions executable by the processor to; transmit a set of downlink beam-specific reference signals, BRSs; detect a random-access preamble in a signal received from the wireless device, said preamble detection indicating a preferred BRS of said set of downlink beam-specific reference signals (BRSs), the preferred BRS preferred by said wireless device according to one or more pre-defined association rules defining an association between a random access resource and a BRS, wherein the random-access preamble is based on information that is in a look-up table, specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device, or the selecting using a function that uses the preferred BRS as an input and provides the selected random-access preamble as an output, wherein the function is specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device; and transmit a random-access response in a same beam, and/or beam direction, and/or with same beamformning weights, as the preferred BRS. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A wireless communication system comprising:
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a wireless device and a network node the network node operable to transmit a set of downlink beam-specific reference signals, BRSs, and the wireless device operable to; receive the set of downlink beam-specific reference signals (BRSs) from the network node; determine a preferred BRS based on the received signal power for each BRS of the set of downlink beam-specific reference signals (BRSs); select, based on the preferred BRS, a random-access resource to be used to transmit a random-access attempt to the network node according to one or more pre-defined association rules defining an association between a random-access resource and a BRS; and use the selected random-access resource when transmitting a random-access attempt to the network node, whereby the selection of random-access resource indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions; the network node further operable to; detect the preferred BRS of the wireless device based on the random-access resource that the wireless device uses when transmitting the random-access attempt; and transmit a random-access response in a same beam, and/or beam direction, and/or with same beamforming weights, as the preferred BRS wherein the random access resource comprises a random-access preamble to be used by the wireless device for transmitting the random-access attempt and wherein, to select the random-access preamble from a set of preambles, the wireless device is configured to use information that is in a look-up table, specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device, or the selecting using a function that uses the preferred BRS as an input and provides the selected random-access preamble as an output, wherein the function is specified in a manual or standard, given by prior broadcast signaling, or configured by dedicated signaling on an assisting legacy network of the wireless device.
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Specification