Coverage extension level for coverage limited device
First Claim
Patent Images
1. An apparatus of a user equipment (UE), the apparatus comprising:
- memory; and
processing circuitry, configured to;
decode system information that includes physical random access channel (PRACH) configuration information for coverage enhancement, the PRACH configuration information including reference signal received power (RSRP) thresholds for coverage enhancement levels and PRACH resource sets for the coverage enhancement levels;
select a coverage enhancement level based on a measured RSRP level and the RSRP thresholds;
determine a PRACH configuration and a number of PRACH repetitions based on the selected coverage enhancement level;
select a preamble sequence from a group of preamble sequences, the group corresponding to the selected coverage enhancement level;
select a PRACH resource from one of the PRACH resource sets that corresponds to the selected coverage enhancement level; and
initiate a random access procedure in accordance with the PRACH configuration, the random access procedure comprising transmission of the selected preamble sequence in accordance with the number of repetitions on the selected PRACH resource,wherein when PRACH frequency hopping is enabled, the processing circuitry is further configured to select a different PRACH resource for each repetition of the selected preamble sequence.
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Abstract
Generally discussed herein are systems, apparatuses, and methods that can provide a coverage enhancement to a coverage limited device. According to an example a method can include determining a received signal strength of a reference signal transmitted from a base station, determining a coverage enhancement based on the determined signal strength, or transmitting a signature sequence of a plurality of signature sequences a first repeated number of times corresponding to the determined coverage enhancement.
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Citations
21 Claims
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1. An apparatus of a user equipment (UE), the apparatus comprising:
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memory; and processing circuitry, configured to; decode system information that includes physical random access channel (PRACH) configuration information for coverage enhancement, the PRACH configuration information including reference signal received power (RSRP) thresholds for coverage enhancement levels and PRACH resource sets for the coverage enhancement levels; select a coverage enhancement level based on a measured RSRP level and the RSRP thresholds; determine a PRACH configuration and a number of PRACH repetitions based on the selected coverage enhancement level; select a preamble sequence from a group of preamble sequences, the group corresponding to the selected coverage enhancement level; select a PRACH resource from one of the PRACH resource sets that corresponds to the selected coverage enhancement level; and initiate a random access procedure in accordance with the PRACH configuration, the random access procedure comprising transmission of the selected preamble sequence in accordance with the number of repetitions on the selected PRACH resource, wherein when PRACH frequency hopping is enabled, the processing circuitry is further configured to select a different PRACH resource for each repetition of the selected preamble sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 21)
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11. A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of user equipment (UE) to configure the UE to perform operations to:
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select a coverage enhancement level based on a measured reference signal received power (RSRP) level and RSRP thresholds; determine a physical random access channel (PRACH) configuration and a number of PRACH repetitions based on the selected coverage enhancement level; select a PRACH resource from one of a plurality of PRACH resource sets that corresponds to the selected coverage enhancement level; and initiate a random access procedure in accordance with the PRACH configuration, the random access procedure comprising transmission of a selected preamble sequence in accordance with the number of repetitions on the selected PRACH resource; and wherein when PRACH frequency hopping is enabled, a different PRACH resource is selected for each repetition of the selected preamble sequence. - View Dependent Claims (12, 13, 14)
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15. An apparatus of a user equipment (UE), the apparatus comprising:
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an interface; and processing circuitry coupled to the interface, the processing circuitry configured to; select a PRACH resource from one of a plurality of PRACH resource sets that corresponds to a selected one of a plurality of coverage enhancement levels, the selected coverage enhancement level based on a measured reference signal received power (RSRP) level; and initiate a random access procedure comprising transmission of a preamble sequence in accordance with a number of repetitions on the selected PRACH resource, wherein each of the enhanced coverage levels is associated with one of the PRACH resource sets, and wherein when PRACH frequency hopping is enabled, a different PRACH resource is selected for each repetition of the selected preamble sequence. - View Dependent Claims (16, 17, 18)
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Specification