MESSAGE 2 OF A TWO-STEP RANDOM ACCESS PROCEDURE AND COEXISTENCE WITH FOUR-STEP RANDOM ACCESS PROCEDURE
First Claim
1. A method for wireless communication at a user equipment (UE), comprising:
- identifying that the UE is to use a two-step random access channel (RACH) procedure, the two-step RACH procedure including an uplink request message and a downlink response intended for the UE;
sending, as a first message of the two-step RACH procedure, the uplink request message to a base station;
receiving, from the base station, a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which the downlink response is to be received, the physical downlink shared channel being configured to provide downlink responses for multiple UEs; and
receiving the downlink response from the base station on the broadcast or multicast physical downlink shared channel, the downlink response being a second message of the two-step RACH procedure.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods, systems, and devices for wireless communications are described. The method includes identifying that the user equipment (UE) is to use a two-step random access channel (RACH) procedure that includes a first message (e.g., uplink request message) and a second message (e.g., downlink response). The methods include sending, as a first message of the two-step RACH procedure, the uplink request message to a base station, receiving, from the base station, a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which the downlink response is to be received, and receiving the downlink response from the base station on the broadcast or multicast physical downlink shared channel. The physical downlink shared channel may be configured to provide downlink responses for one or multiple UEs.
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Citations
40 Claims
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1. A method for wireless communication at a user equipment (UE), comprising:
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identifying that the UE is to use a two-step random access channel (RACH) procedure, the two-step RACH procedure including an uplink request message and a downlink response intended for the UE; sending, as a first message of the two-step RACH procedure, the uplink request message to a base station; receiving, from the base station, a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which the downlink response is to be received, the physical downlink shared channel being configured to provide downlink responses for multiple UEs; and receiving the downlink response from the base station on the broadcast or multicast physical downlink shared channel, the downlink response being a second message of the two-step RACH procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for wireless communication at a base station:
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receiving an uplink request message from a user equipment (UE); identifying that the uplink request message is a first message of a two-step random access channel (RACH) procedure; sending a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which a downlink response to the uplink request message intended for the UE is to be received, the downlink response being a second message of the two-step RACH procedure, the physical downlink shared channel being configured to provide a plurality of downlink responses to a corresponding plurality of UEs that includes the UE; and sending the plurality of downlink responses, including the downlink response intended for the UE, to the plurality of UEs via the broadcast or multicast physical downlink shared channel. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for wireless communication at a user equipment (UE), comprising:
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a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to; identify that the UE is to use a two-step random access channel (RACH) procedure, the two-step RACH procedure including an uplink request message and a downlink response; send, as a first message of the two-step RACH procedure, the uplink request message to a base station; receive, from the base station, a physical downlink control channel that comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which the downlink response is to be received, the physical downlink shared channel being configured to provide downlink responses for multiple UEs; and receive the downlink response from the base station on the broadcast or multicast physical downlink shared channel, the downlink response being a second message of the two-step RACH procedure. - View Dependent Claims (30, 31, 32, 33, 34)
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35. An apparatus for wireless communication at a base station, comprising:
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a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to; receive an uplink request message from a user equipment (UE); identify that the uplink request message is a first message of a two-step random access channel (RACH) procedure; send a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which a downlink response to the uplink request message intended for the UE is to be received, the downlink response being a second message of the two-step RACH procedure, the physical downlink shared channel being configured to provide a plurality of downlink responses to a corresponding plurality of UEs that includes the UE; and send the plurality of downlink responses, including the downlink response intended for the UE, to the multiple UEs via the broadcast or multicast physical downlink shared channel. - View Dependent Claims (36)
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37. An apparatus for wireless communication at a user equipment (UE), comprising:
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means for identifying that the UE is to use a two-step random access channel (RACH) procedure, the two-step RACH procedure including an uplink request message and a downlink response; means for sending, as a first message of the two-step RACH procedure, the uplink request message to a base station; means for receiving, from the base station, a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which the downlink response is to be received, the physical downlink shared channel being configured to provide downlink responses for multiple UEs; and means for receiving the downlink response from the base station on the broadcast or multicast physical downlink shared channel, the downlink response being a second message of the two-step RACH procedure.
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38. An apparatus for wireless communication at a base station, comprising:
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means for receiving an uplink request message from a user equipment (UE); means for identifying that the uplink request message is a first message of a two-step random access channel (RACH) procedure; means for sending a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which a downlink response to the uplink request message intended for the UE is to be received, the downlink response being a second message of the two-step RACH procedure, the physical downlink shared channel being configured to provide a plurality of downlink responses to a corresponding plurality of UEs that includes the UE; and means for sending the plurality of downlink responses, including the downlink response intended for the UE, to the multiple UEs via the broadcast or multicast physical downlink shared channel.
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39. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:
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identify that the UE is to use a two-step random access channel (RACH) procedure, the two-step RACH procedure including an uplink request message and a downlink response; send, as a first message of the two-step RACH procedure, the uplink request message to a base station; receive, from the base station, a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which the downlink response is to be received, the physical downlink shared channel being configured to provide downlink responses for multiple UEs; and receive the downlink response from the base station on the broadcast or multicast physical downlink shared channel, the downlink response being a second message of the two-step RACH procedure.
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40. A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to:
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receive an uplink request message from a user equipment (UE); identify that the uplink request message is a first message of a two-step random access channel (RACH) procedure; send a physical downlink control channel comprising an indication of resources of a broadcast or multicast physical downlink shared channel on which a downlink response to the uplink request message intended for the UE is to be received, the downlink response being a second message of the two-step RACH procedure, the physical downlink shared channel being configured to provide a plurality of downlink responses to a corresponding plurality of UEs that includes the UE; and send the plurality of downlink responses, including the downlink response intended for the UE, to the multiple UEs via the broadcast or multicast physical downlink shared channel.
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Specification