Random access procedure for enhanced coverage support
First Claim
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1. An apparatus to be employed in a user equipment, UE, the apparatus comprising:
- one or more processors;
a memory coupled to the one or more processors having instructions thereon that when executed cause the processors to;
identify an initial enhanced coverage, EC, level that is to be used in a radio cell during a contention-based random access, RA, procedure, the EC level having at least an associated power level, window of time, and number of send attempts;
send a first message to a radio access network, RAN, based on the identified EC level;
determine an EC second message window region having a plurality of subframes including one or more EC second message opportunities, each being a contiguous group of subframes, a first EC second message opportunity of the one or more EC second message opportunities to begin at a same subframe as a beginning of the EC second message window region and K subframes after the first message was sent;
determine whether a second message from the RAN in response to the first message is received within the one or more EC second message opportunities;
if the second message is received from the RAN within the one or more EC second message opportunities, decode the received second message; and
if the second message is not received from the RAN within the one or more EC second message opportunities;
re-send the first message to the RAN.
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Abstract
Embodiments described herein relate generally to a communication between a user equipment (UE) and an evolved Node B (eNB) that are both running in Enhanced Coverage (EC) mode. The UE and eNB may communicate in a contention-based random access procedure having an EC level that may be used to determine the number of times an RA preamble may be sent, and one or more RA response opportunity windows that may be used to receive one or more RA responses. Other embodiments may be described and/or claimed.
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Citations
15 Claims
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1. An apparatus to be employed in a user equipment, UE, the apparatus comprising:
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one or more processors; a memory coupled to the one or more processors having instructions thereon that when executed cause the processors to; identify an initial enhanced coverage, EC, level that is to be used in a radio cell during a contention-based random access, RA, procedure, the EC level having at least an associated power level, window of time, and number of send attempts; send a first message to a radio access network, RAN, based on the identified EC level; determine an EC second message window region having a plurality of subframes including one or more EC second message opportunities, each being a contiguous group of subframes, a first EC second message opportunity of the one or more EC second message opportunities to begin at a same subframe as a beginning of the EC second message window region and K subframes after the first message was sent; determine whether a second message from the RAN in response to the first message is received within the one or more EC second message opportunities; if the second message is received from the RAN within the one or more EC second message opportunities, decode the received second message; and if the second message is not received from the RAN within the one or more EC second message opportunities; re-send the first message to the RAN. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus to be employed in a user equipment, UE, the apparatus comprising:
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logic circuitry to identify an enhanced coverage, EC level; transmit circuitry to send to a radio access network, RAN, a random access, RA, preamble based on the identified EC level; logic circuitry to identify an EC random access response, RAR, window region having a plurality of subframes, the EC RAR window region including one or more EC RAR opportunities, each being a contiguous group of subframes, a first EC RAR opportunity of the one or more EC RAR opportunities to begin;
at a same subframe as a beginning of the EC RAR window region; and
K subframes after the RA preamble was sent. - View Dependent Claims (14, 15)
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Specification