Method and apparatus for coverage enhancement for a random access process
First Claim
1. A method comprising:
- transmitting, by a base station to a User Equipment (UE), a system information block (SIB) that informs a number of resource sets for random access (RA) preamble transmission in a resource from a resource set, wherein each resource set includes time, frequency, and code resources and is associated with a number of repetitions for a RA preamble transmission and with a maximum number of RA preamble transmissions, wherein the SIB is configured to enable the UE to determine the first number of repetitions for a transmission of a RA preamble, a corresponding first resource set, and a corresponding first maximum number of transmissions and a second number of repetitions for a transmission of a RA preamble, a corresponding second resource set, and a corresponding second maximum number of transmissions, and wherein the second number of repetitions is larger than the first number of repetitions; and
receiving, from the UE;
the RA preamble, in a resource from the first resource set and with the first number of repetitions, until the UE receives a response for a RA preamble transmission with the first number of repetitions or until the first maximum number of RA preamble transmissions is reached; and
the RA preamble, in a resource from the second resource set and with the second number of repetitions, after the first maximum number of RA preamble transmissions is reached.
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Accused Products
Abstract
Methods and apparatus are provided for a User Equipment (UE) and a base station in communication with each other to determine parameters for a Random Access (RA) process. The base station informs the UE through a System Information Block (SIB) of a number of resource sets for RA preamble transmission by the UE. Each resource set is associated with a number of repetitions for a RA preamble transmission, with a maximum number of RA preamble transmissions, and with a number of repetitions the base station transmits a response to a RA preamble reception. The SIB also informs an association between a range of path-loss values and a number of RA preamble repetitions. The UE determines a number of repetitions for a first RA preamble transmission from its path-loss measurement.
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Citations
20 Claims
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1. A method comprising:
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transmitting, by a base station to a User Equipment (UE), a system information block (SIB) that informs a number of resource sets for random access (RA) preamble transmission in a resource from a resource set, wherein each resource set includes time, frequency, and code resources and is associated with a number of repetitions for a RA preamble transmission and with a maximum number of RA preamble transmissions, wherein the SIB is configured to enable the UE to determine the first number of repetitions for a transmission of a RA preamble, a corresponding first resource set, and a corresponding first maximum number of transmissions and a second number of repetitions for a transmission of a RA preamble, a corresponding second resource set, and a corresponding second maximum number of transmissions, and wherein the second number of repetitions is larger than the first number of repetitions; and receiving, from the UE; the RA preamble, in a resource from the first resource set and with the first number of repetitions, until the UE receives a response for a RA preamble transmission with the first number of repetitions or until the first maximum number of RA preamble transmissions is reached; and the RA preamble, in a resource from the second resource set and with the second number of repetitions, after the first maximum number of RA preamble transmissions is reached. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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receiving, from a base station by a UE, a system information block (SIB) that informs a number of resource sets for random access (RA) preamble transmission in a resource from a resource set, wherein each resource set includes time, frequency, and code resources and is associated with a number of repetitions for a RA preamble transmission and with a maximum number of RA preamble transmissions; receiving, by the UE from the base station, the system information block; determining by the UE a number of repetitions for a transmission of a RA preamble and a corresponding resource set; transmitting by the UE the RA preamble for the number of repetitions in a resource from the resource set; and receiving, by the UE from the base station, a second message in response to the RA preamble transmission wherein the UE receives the second message for a number of repetitions that is indicated by downlink control information in a control channel scheduling the second message relative to a maximum number of repetitions that is informed by the SIB in association with the number of repetitions for the RA preamble transmission. - View Dependent Claims (8, 9, 10)
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11. A User Equipment (UE) comprising:
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a receiver configured to receive from a base station a system information block (SIB) that informs a number of resource sets for random access (RA) preamble transmission in a resource from a resource set, wherein each resource set includes time, frequency, and code resources and is associated with a number of repetitions for a RA preamble transmission and with a maximum number of RA preamble transmissions; a controller configured to; determine a first number of repetitions for a transmission of a RA preamble, a corresponding first resource set, and a corresponding first maximum number of transmissions; and determine a second number of repetitions for a transmission of a RA preamble, a corresponding second resource set, and a corresponding second maximum number of transmissions wherein the second number of repetitions is larger than the first number of repetitions; and a transmitter configured to; transmit to the base station, in a resource from the first resource set and with the first number of repetitions, the RA preamble until the apparatus receives a response for a RA preamble transmission with the first number of repetitions or until the first maximum number of RA preamble transmissions is reached; and transmit to the base station, in a resource from the second resource set and with the second number of repetitions, the RA preamble after the first maximum number of RA preamble transmissions is reached. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A User Equipment (UE) comprising:
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a receiver configured to receive from a base station a system information block (SIB) that informs a number of resource sets for random access (RA) preamble transmissions wherein each resource set is associated with a number of repetitions for a RA preamble transmission in a resource from the resource set and with a maximum number of RA preamble transmissions; and a second message in response to a RA preamble transmission wherein the second message is received for a number of repetitions that is indicated by downlink control information in a control channel scheduling the second message relative to a maximum number of repetitions that is informed by the SIB in association with the number of repetitions for the RA preamble transmission; a controller configured to determine a number of repetitions for a transmission of a RA preamble and a corresponding resource set; and a transmitter configured to transmit the RA preamble for the number of repetitions in a resource from the resource set. - View Dependent Claims (18, 19, 20)
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Specification