Abstract
A User Equipment (UE) including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a cellular station. The controller uses first Physical Random Access Channel (PRACH) resources to perform a first PRACH transmission or retransmission, and switches to use second PRACH resources to perform a second PRACH retransmission subsequent to the first PRACH transmission or retransmission.
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5G | 03/02/2021 | ISLD-202102-003 | MEDIATEK INC | Yes | Basis Patent |
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US10778288B2 | 5G | 03/02/2021 | ISLD-202102-003 | MEDIATEK INC | Yes | Basis Patent | ||||
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Claim
1. A User Equipment (UE), comprising:
a wireless transceiver, configured to perform wireless transmission and reception to and from a cellular station; and a controller, configured to use first Physical Random Access Channel (PRACH) resources to perform a first PRACH transmission or retransmission, and switch to use second PRACH resources to perform a second PRACH retransmission subsequent to the first PRACH transmission or retransmission.
2. The UE of claim 1, wherein each of the first PRACH resources and the second PRACH resources comprises one or more PRACH preambles, one or more RACH occasions, or a combination of the PRACH preambles and the RACH occasions.
3. The UE of claim 1, wherein, when the first PRACH resources and the second PRACH resources are associated with the same downlink reference signal, the controller is further configured to increment a preamble transmission counter by one in response to the second PRACH retransmission, determine whether the first PRACH transmission or retransmission and the second PRACH retransmission are performed on the same beam or on different beams, increment a power ramping counter by one in response to the first PRACH transmission or retransmission and the second PRACH retransmission being performed on the same beam, and not increment the power ramping counter in response to the first PRACH transmission or retransmission and the second PRACH retransmission being performed on different beams.
4. The UE of claim 3, wherein the downlink reference signal comprises a Channel State Information-Reference Signal (CSI-RS), a Synchronization Signal Block (SSB), or a Physical Broadcast Channel (PBCH) block.
5. The UE of claim 1, wherein, when the first PRACH resources and the second PRACH resources are associated with different downlink reference signals, the controller is further configured to increment a preamble transmission counter by one and not increment a power ramping counter in response to the second PRACH retransmission.
6. The UE of claim 5, wherein each of the downlink reference signals comprises a CSI-RS, an SSB, or a PBCH block.
7. The UE of claim 1, wherein, when the first PRACH resources and the second PRACH resources are associated with different downlink reference signals, the step of switching to use the second PRACH resources for the second PRACH retransmission is performed under at least one of the following conditions:
a first measurement result of the downlink reference signal associated with the first PRACH resources is better than a second measurement result of the downlink reference signal associated with the second PRACH resources; a next occurrence of the second PRACH resources is closer to the current time than a next occurrence of the first PRACH resources; a first transmission power used for the first PRACH transmission or retransmission equals a maximum transmission power of the UE, while a total number of PRACH transmissions or retransmissions has not reached a maximum transmission number configured by the cellular station; and a Transmission Configuration Indication (TCI) state associated with a search space for monitoring a response to the first PRACH transmission or retransmission has been changed.
8. A method for a PRACH retransmission, executed by a UE wirelessly connected to a cellular station, the method comprising:
using first PRACH resources to perform a first PRACH transmission or retransmission; and switching to use second PRACH resources to perform a second PRACH retransmission subsequent to the first PRACH transmission or retransmission.
9. The method of claim 8, wherein each of the first PRACH resources and the second PRACH resources comprises one or more PRACH preambles, one or more RACH occasions, or a combination of the PRACH preambles and the RACH occasions.
10. The method of claim 8, further comprising:
when the first PRACH resources and the second PRACH resources are associated with the same downlink reference signal,
incrementing a preamble transmission counter by one in response to the second PRACH retransmission;
determining whether the first PRACH transmission or retransmission and the second PRACH retransmission are performed on the same beam or on different beams;
incrementing a power ramping counter by one in response to the first PRACH transmission or retransmission and the second PRACH retransmission being performed on the same beam; and
not incrementing the power ramping counter in response to the first PRACH transmission or retransmission and the second PRACH retransmission being performed on different beams.
11. The method of claim 10, wherein the downlink reference signal comprises a CSI-RS, an SSB, or a PBCH block.
12. The method of claim 8, further comprising:
when the first PRACH resources and the second PRACH resources are associated with different downlink reference signals, incrementing a preamble transmission counter by one and not incrementing a power ramping counter in response to the second PRACH retransmission.
13. The method of claim 12, wherein the downlink reference signal comprises a CSI-RS, an SSB, or a PBCH block.
14. The method of claim 8, wherein, when the first PRACH resources and the second PRACH resources are associated with different downlink reference signals, the step of switching to use the second PRACH resources for the second PRACH retransmission is performed under at least one of the following conditions:
a first measurement result of the downlink reference signal associated with the first PRACH resources is better than a second measurement result of the downlink reference signal associated with the second PRACH resources; a next occurrence of the second PRACH resources is closer to the current time than a next occurrence of the first PRACH resources; a first transmission power used for the first PRACH transmission or retransmission equals a maximum transmission power of the UE, while a total number of PRACH transmissions or retransmissions has not reached a maximum transmission number configured by the cellular station; and a Transmission Configuration Indication (TCI) state associated with a search space for monitoring a response to the first PRACH transmission or retransmission has been changed.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.