FREQUENCY HOPPING CONFIGURATION FOR A MULTI-TONE PHYSICAL RANDOM ACCESS CHANNEL TRANSMISSION

• US 20180310341A1
• Filed: 11/13/2017
• Published: 10/25/2018
• Est. Priority Date: 04/24/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: YERRAMALLI, Srinivas, LIU, Chih-Hao, KADOUS, Tamer
• Granted Patent: US 10,721,774 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/0012 Hopping in multicarrier systems for frequency hopping in spread spectrum systems H04B1/713
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. In one configuration, the apparatus may receive, from a base station, first information associated with one or more resources allocated for at least one PRACH transmission. In one aspect, the one or more resources may be allocated in an unlicensed spectrum. In another aspect, the one or more resources may be allocated based on a multi-tone PRACH bandwidth. The apparatus may also receive second information associated with a frequency hopping configuration from the base station. In one aspect, the frequency hopping configuration may be associated with at least one of the one or more allocated resources or the multi-tone PRACH bandwidth. The apparatus may transmit, to the base station, the at least one PRACH transmission using the one or more allocated resources within the multi-tone PRACH bandwidth and the frequency hopping configuration.

Claims

1. A method of wireless communication for a user equipment (UE), comprising:

receiving, from a base station, first information associated with one or more resources allocated for at least one physical random access channel (PRACH) transmission, the one or more resources being allocated in an unlicensed spectrum, and the one or more resources being allocated based on a multi-tone PRACH bandwidth;

receiving second information associated with a frequency hopping configuration from the base station, the frequency hopping configuration being associated with at least one of the one or more allocated resources or the multi-tone PRACH bandwidth; and

transmitting, to the base station, the at least one PRACH transmission using the one or more allocated resources within the multi-tone PRACH bandwidth and the frequency hopping configuration.

2. The method of claim 1, further comprising:

receiving third information associated with a power spectral density (PSD), the PSD being associated with one or more physical channels.

3. The method of claim 2, wherein the third information indicates if a PSD limit applies to the one or more physical channels.

4. The method of claim 3, wherein the third information further indicates the PSD limit when the PSD limit applies to the one or more physical channels.

5. The method of claim 2, wherein the third information is received in a system information block (SIB) on an anchor channel or a frequency hopping channel.

6. The method of claim 3, further comprising:

determining that a first transmission of the at least one PRACH transmission was transmitted using the PSD limit and was not properly received by the base station; and

increasing a number of repetitions for a retransmission of the first transmission or increasing a bandwidth used to transmit the retransmission of the first transmission.

7. The method of claim 6, further comprising:

receiving signaling from the base station that either

configures the UE to increase the number of repetitions for the retransmission of the first transmission, or

configures the UE to increase a bandwidth used to transmit the retransmission of the first transmission; and

retransmitting the first transmission with either an increased number of repetitions or an increased bandwidth.

8. The method of claim 1, wherein the transmitting the at least one PRACH transmission using the frequency hopping configuration comprises:

transmitting a first set of PRACH transmissions using a first set of symbol groups located in a first set of adjacent tones; and

transmitting a second set of PRACH transmissions using a second set of symbol groups located in a second set of adjacent tones, the second set of adjacent tones being non-adjacent to the first set of adjacent tones.

9. The method of claim 8, wherein the first set of adjacent tones and the second set of adjacent tones are located in a first portion of the unlicensed spectrum and the transmitting the at least one PRACH transmission using the frequency hopping configuration further comprises:

transmitting a third set of PRACH transmissions using a third set of symbol groups located in a third set of adjacent tones, the third set of adjacent tones being located in a second portion of the unlicensed spectrum that is non-overlapping with the first portion of the unlicensed spectrum.

10. The method of claim 9, wherein:

the transmitting the first set of PRACH transmissions in the first set of adjacent tones comprises first level frequency hopping;

the transmitting the second set of PRACH transmissions in the second set of adjacent tones that are non-adjacent to the first set of adjacent tones comprises second level frequency hopping; and

the transmitting the third set of PRACH transmissions in the third set of adjacent tones that are in the second portion of the unlicensed spectrum that is non-overlapping with the first portion of the unlicensed spectrum comprises third level frequency hopping.

11. The method of claim 1, wherein the transmitting the at least one PRACH transmission using the frequency hopping configuration comprises:

transmitting a first PRACH transmission using a first symbol group located in a first tone; and

transmitting a second PRACH transmission using a second symbol group located in a second tone, the second tone being non-adjacent to the first tone.

12. The method of claim 11, wherein the first tone and the second tone are located in a first portion of the unlicensed spectrum and the transmitting the at least one PRACH transmission using the frequency hopping configuration further comprises:

transmitting a third PRACH transmission using a third symbol group located in a third tone, the third tone being located in a second portion of the unlicensed spectrum that is non-overlapping with the first portion of the unlicensed spectrum.

13. The method of claim 12, wherein:

the transmitting the second PRACH transmission in the second tone that is non-adjacent to the first tone comprises second level frequency hopping; and

the transmitting the third PRACH transmission in the third tone that is in the second portion of the unlicensed spectrum that is non-overlapping with the first portion of the unlicensed spectrum comprises third level frequency hopping.

14. The method of claim 1, further comprising:

receiving third information indicating one or more of a frame structure associated with the one or more resources allocated for the at least one PRACH transmission or indicating if a listen-before-talk (LBT) procedure is performed before transmitting the at least one PRACH transmission; and

performing the LBT procedure when the third information indicates that the LBT procedure is performed before the transmitting the at least one PRACH transmission.

15. The method of claim 1, further comprising:

determining at least one of the one or more resources for transmitting the at least one PRACH transmission, the at least one of the one or more resources determined based on a bandwidth capability of the UE.

16. The method of claim 1, wherein the first information indicates a tone spacing within the multi-tone PRACH bandwidth.

17. A method of wireless communication for a base station, comprising:

transmitting, to a user equipment (UE), first information associated with one or more resources allocated to the UE for at least one physical random access channel (PRACH) transmission, the one or more resources being allocated in an unlicensed spectrum, and the one or more resources being allocated based on a multi-tone PRACH bandwidth;

transmitting second information associated with a frequency hopping configuration to the UE, the frequency hopping configuration being associated with at least one of the one or more allocated resources or the multi-tone PRACH bandwidth; and

receiving, from the UE, the at least one PRACH transmission using the one or more allocated resources within the multi-tone PRACH bandwidth and the frequency hopping configuration.

18. The method of claim 17, further comprising:

transmitting third information associated with a power spectral density (PSD) to the UE, the PSD being associated with one or more physical channels.

19. The method of claim 18, wherein the third information indicates if a PSD limit applies to the one or more physical channels.

20. The method of claim 19, wherein the third information further indicates the PSD limit when the PSD limit applies to the one or more physical channels.

21. The method of claim 18, wherein the third information is transmitted in a system information block (SIB) on an anchor channel or a frequency hopping channel.

22. The method of claim 19, further comprising:

determining that a first transmission of the at least one PRACH transmission was transmitted using the PSD limit and was not properly received; and

transmitting signaling that either

configures the UE to increase the number of repetitions for a retransmission of the first transmission, or

configures the UE to increase a bandwidth used to transmit the retransmission of the first transmission.

23. The method of claim 22, further comprising:

receiving a retransmission of the first transmission with either an increased number of repetitions or an increased bandwidth from the UE.

24. The method of claim 17, wherein the receiving the at least one PRACH transmission using the frequency hopping configuration comprises:

receiving a first set of PRACH transmissions using a first set of symbol groups located in a first set of adjacent tones; and

receiving a second set of PRACH transmissions using a second set of symbol groups located in a second set of adjacent tones, the second set of adjacent tones being non-adjacent to the first set of adjacent tones.

25. The method of claim 24, wherein the first set of adjacent tones and the second set of adjacent tones are located in a first portion of the unlicensed spectrum and the receiving the at least one PRACH transmission using the frequency hopping configuration further comprises:

receiving a third set of PRACH transmissions using a third set of symbol groups located in a third set of adjacent tones, the third set of adjacent tones being located in a second portion of the unlicensed spectrum that is non-overlapping with the first portion of the unlicensed spectrum.

26. The method of claim 17, wherein the receiving the at least one PRACH transmission using the frequency hopping configuration comprises:

receiving a first PRACH transmission using a first symbol group located in a first tone; and

receiving a second PRACH transmission using a second symbol group located in a second tone, the second tone being non-adjacent to the first tone.

27. The method of claim 26, wherein the first tone and the second tone are located in a first portion of the unlicensed spectrum and the receiving the at least one PRACH transmission using the frequency hopping configuration further comprises:

receiving a third PRACH transmission using a third symbol group located in a third tone, the third tone being located in a second portion of the unlicensed spectrum that is non-overlapping with the first portion of the unlicensed spectrum.

28. The method of claim 17, further comprising:

transmitting third information indicating one or more of a frame structure associated with the one or more resources allocated for the at least one PRACH transmission or indicating if a listen-before-talk (LBT) procedure is performed before the UE transmits the at least one PRACH transmission.

29. An apparatus for wireless communication for a user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive, from a base station, first information associated with one or more resources allocated for at least one physical random access channel (PRACH) transmission, the one or more resources being allocated in an unlicensed spectrum, and the one or more resources being allocated based on a multi-tone PRACH bandwidth;

receive second information associated with a frequency hopping configuration from the base station, the frequency hopping configuration being associated with at least one of the one or more allocated resources or the multi-tone PRACH bandwidth; and

transmit, to the base station, the at least one PRACH transmission using the one or more allocated resources within the multi-tone PRACH bandwidth and the frequency hopping configuration.

30. An apparatus for wireless communication for a base station, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

transmit, to a user equipment (UE), first information associated with one or more resources allocated to the UE for at least one physical random access channel (PRACH) transmission, the one or more resources being allocated in an unlicensed spectrum, and the one or more resources being allocated based on a multi-tone PRACH bandwidth;

transmit second information associated with a frequency hopping configuration to the UE, the frequency hopping configuration being associated with at least one of the one or more allocated resources or the multi-tone PRACH bandwidth; and

receive, from the UE, the at least one PRACH transmission using the one or more allocated resources within the multi-tone PRACH bandwidth and the frequency hopping configuration.