IP Library › Granted Patent US 10,785,796

Granted Patent B2

US 10,785,796 · App. 15/489,344 · Granted Sep 22, 2020

Preamble group selection in random access of wireless networks

Inventors: Pierre Bertrand (Antibes, FR); Shantanu Kangude (Dallas, TX); Zukang Shen (Allen, TX)

Assignee: TEXAS INSTRUMENTS INCORPORATED

H04W74/008 H04L1/0007 H04L27/2692 H04W28/0221 H04W40/08 H04W52/04 H04W72/0473 H04W74/002 H04W74/0833 H04L2027/0095 H04W72/085

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Quick Facts

Patent No.: US 10,785,796
App. No.: 15/489,344
Granted: Sep 22, 2020
Kind: B2

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Abstract

A transport block size (TBS) of a first uplink message (RACH Msg3) transmitted on a Physical Uplink Shared Channel (PUSCH) during a random access procedure in a User Equipment (UE) accessing a radio access network may be determined by receiving a pathloss threshold parameter. A downlink pathloss value indicative of radio link conditions between the UE and a base station (eNB) serving the UE is then determined. A smaller value of TBS is selected from a set of TBS values if the determined pathloss value is greater than an operating power level of the UE minus the pathloss threshold parameter. A larger value of TBS is selected if the pathloss value is less than the operating power level of the UE minus the pathloss threshold parameter and the TBS required to transmit the RACH Msg3 exceeds the smaller TBS value.

Claims (130)

1. A method comprising:

receiving, at a user equipment (UE), a threshold parameter via a system information block (SIB);

selecting, by the UE, a random access preamble group for use in a random access procedure based on whether a pathloss is less than a maximum power parameter minus an initial preamble power parameter minus a Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB; and

performing, by the UE, the random access procedure based on the selected random access preamble group.

2. The method of claim 1 , wherein selecting the random access preamble group includes:

selecting one of a first random access preamble group and a second random access preamble group based on whether the pathloss is less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

3. The method of claim 1 , wherein selecting the random access preamble group includes:

selecting a first random access preamble group if the pathloss is less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

4. The method of claim 3 , wherein selecting the random access preamble group further includes:

selecting a second random access preamble group if the pathloss is not less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

5. The method of claim 1 , wherein selecting the random access preamble group includes:

6. The method of claim 5 , wherein selecting the random access preamble group further includes:

selecting one of a first random access preamble group and the second random access preamble group if the pathloss is less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

7. The method of claim 1 , wherein performing the random access procedure includes:

transmitting, by the UE, a message 3 of the random access procedure.

8. The method of claim 1 , wherein performing the random access procedure includes:

transmitting, by the UE, a random access preamble from the selected random access preamble group.

9. The method of claim 1 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to an offset between a preamble and a message 3 of the random access procedure.

10. The method of claim 9 , wherein the Δ PREAMBLE-Msg3 parameter further corresponds to a nominal power gap between the preamble and the message 3 of the random access procedure.

11. The method of claim 1 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to a nominal power gap between a preamble and a message 3 of the random access procedure.

12. A user equipment (UE) comprising one or more processors configured to:

receive, at the UE, a threshold parameter via a system information block (SIB);

select a random access preamble group for use in a random access procedure based on whether a pathloss is less than a maximum power parameter minus an initial preamble power parameter minus a Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB; and

perform the random access procedure based on the selected random access preamble group.

13. The UE of claim 12 , wherein the one or more processors are further configured to:

select one of a first random access preamble group and a second random access preamble group based on whether the pathloss is less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

14. The UE of claim 12 , wherein the one or more processors are further configured to:

select a first random access preamble group if the pathloss is less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

15. The UE of claim 14 , wherein the one or more processors are further configured to:

select a second random access preamble group if the pathloss is not less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

16. The UE of claim 12 , wherein the one or more processors are further configured to:

17. The UE of claim 16 , wherein the one or more processors are further configured to:

select one of a first random access preamble group and the second random access preamble group if the pathloss is less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

18. The UE of claim 16 , wherein the one or more processors are further configured to:

transmit a message 3 of the random access procedure.

19. The UE of claim 12 , wherein the one or more processors are further configured to:

transmit a random access preamble from the selected random access preamble group.

20. The UE of claim 12 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to an offset between a preamble and a message 3 of the random access procedure.

21. The UE of claim 20 , wherein the Δ PREAMBLE-Msg3 parameter further corresponds to a nominal power gap between the preamble and the message 3 of the random access procedure.

22. The UE of claim 12 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to a nominal power gap between a preamble and a message 3 of the random access procedure.

23. A user equipment (UE) comprising:

a transceiver configured to receive a threshold parameter via a system information block (SIB);

one or more processors configured to:

perform the random access procedure based on the selected random access preamble group.

24. The UE of claim 23 , wherein the one or more processors are further configured to:

25. The UE of claim 23 , wherein the one or more processors are further configured to:

26. The UE of claim 25 , wherein the one or more processors are further configured to:

27. The UE of claim 23 , wherein the one or more processors are further configured to:

28. The UE of claim 27 , wherein the one or more processors are further configured to:

29. The UE of claim 23 , wherein the transceiver is further configured to:

transmit a message 3 of the random access procedure.

30. The UE of claim 23 , wherein the transceiver is further configured to:

transmit a random access preamble from the selected random access preamble group.

31. The UE of claim 18 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to an offset between a preamble and a message 3 of the random access procedure.

32. The UE of claim 31 , wherein the Δ PREAMBLE-Msg3 parameter further corresponds to a nominal power gap between the preamble and the message 3 of the random access procedure.

33. The UE of claim 23 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to a nominal power gap between a preamble and a message 3 of the random access procedure.

34. A method comprising:

receiving, at a user equipment (UE), a threshold parameter via a system information block (SIB);

performing the random access procedure based on the selected random access preamble group, wherein performing the random access procedure includes:

receiving, at the UE, an uplink resource allocation as part of the random access procedure; and

transmitting, by the UE, a message on a physical uplink shared channel (PUSCH) based on the uplink resource allocation as part of the random access procedure.

35. The method of claim 34 , wherein selecting the random access preamble group includes:

36. The method of claim 34 , wherein selecting the random access preamble group includes:

37. The method of claim 36 , wherein selecting the random access preamble group further includes:

selecting a second random access preamble group if the pathless is not less than the maximum power parameter minus the initial preamble power parameter minus the Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB.

38. The method of claim 34 , wherein selecting the random access preamble group includes:

39. The method of claim 38 , wherein selecting the random access preamble group further includes:

40. The method of claim 34 , wherein the message is a message 3 of the random access procedure.

41. The method of claim 34 , wherein performing the random access procedure further includes:

transmitting, by the UE, a random access preamble from the selected random access preamble group.

42. The method of claim 24 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to an offset between a preamble and a message 3 of the random access procedure.

43. The method of claim 42 , wherein the Δ PREAMBLE-Msg3 parameter further corresponds to a nominal power gap between the preamble and the message 3 of the random access procedure.

44. The method of claim 24 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to a nominal power gap between a preamble and a message 3 of the random access procedure.

45. A user equipment (UE) comprising one or more processors configured to:

receive a threshold parameter via a system information block (SIB);

perform the random access procedure based on the selected random access preamble group;

receive an uplink resource allocation as part of the random access procedure; and

transmit a message on a physical uplink shared channel (PUSCH) based on the uplink resource allocation as part of the random access procedure.

46. The UE of claim 45 , wherein the one or more processors are further configured to:

47. The UE of claim 45 , wherein the one or more processors are further configured to:

48. The UE of claim 47 , wherein the one or more processors are further configured to:

49. The UE of claim 45 , wherein the one or more processors are further configured to:

50. The UE of claim 49 , wherein the one or more processors are further configured to:

51. The UE of claim 45 , wherein the message is a message 3 of the random access procedure.

52. The UE of claim 45 , wherein the one or more processors are further configured to:

transmit a random access preamble from the selected random access preamble group.

53. The UE of claim 45 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to an offset between a preamble and a message 3 of the random access procedure.

54. The UE of claim 53 , wherein the Δ PREAMBLE-Msg3 parameter further corresponds to a nominal power gap between the preamble and the message 3 of the random access procedure.

55. The UE of claim 45 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to a nominal power gap between a preamble and a message 3 of the random access procedure.

56. A user equipment (UE) comprising:

a transceiver configured to receive a threshold parameter via a system information block (SIB); and

one or more processors configured to select a random access preamble group for use in a random access procedure based on whether a pathloss is less than a maximum power parameter minus an initial preamble power parameter minus a Δ PREAMBLE-Msg3 parameter minus the threshold parameter received via the SIB, and to perform the random access procedure based on the selected random access preamble group,

wherein the transceiver is further configured to:

receive an uplink resource allocation as part of the random access procedure; and

transmit a message on a physical uplink shared channel (PUSCH) based on the uplink resource allocation as part of the random access procedure.

57. The UE of claim 56 , wherein the one or more processors are further configured to:

58. The UE of claim 56 , wherein the one or more processors are further configured to:

59. The UE of claim 58 , wherein the one or more processors are further configured to:

60. The UE of claim 56 , wherein the one or more processors are further configured to:

61. The UE of claim 60 , wherein the one or more processors are further configured to:

62. The UE of claim 56 , wherein the message is a message 3 of the random access procedure.

63. The UE of claim 56 , wherein the transceiver is further configured to:

transmit a random access preamble from the selected random access preamble group.

64. The UE of claim 56 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to an offset between a preamble and a message 3 of the random access procedure.

65. The UE of claim 64 , wherein the Δ PREAMBLE-Msg3 parameter further corresponds to a nominal power gap between the preamble and the message 3 of the random access procedure.

66. The UE of claim 56 , wherein the Δ PREAMBLE-Msg3 parameter corresponds to a nominal power gap between a preamble and a message 3 of the random access procedure.

Continuity (5)

Continuation 14444896 · Jul 28, 2014

Division 13413450 · Mar 6, 2012

Division 12563281 · Sep 21, 2009

Provisional Application 61098346 · Sep 19, 2008

Related Publication 20170223732A1 · Aug 3, 2017

Cited By (1)

US 12,720,611