COMMUNICATION BETWEEN MAC AND PHY FOR PARALLEL RANDOM ACCESS PROCEDURES OF DUAL CONNECTIVITY

• US 20190313463A1
• Filed: 04/18/2019
• Published: 10/10/2019
• Est. Priority Date: 09/24/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Sunyoung, YI, Seungjune, PARK, Sungjun, LEE, Youngdae
• Granted Patent: US 11,153,911 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/2612 Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity H04B7/2615 - H04B7/2643 take precedence; provision for broadband connection H04Q11/0478
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present invention relates to a communication between MAC layer entity and PHY layer entity for parallel random access procedures of dual connectivity. In this scheme, a first PHY entity of a user equipment informs a failure of a random access preamble transmission to a first MAC entity of the UE. Then, the first MAC entity continues or stops a random access procedure without performing procedures for a random access failure.

Claims

1. A method of operating a user equipment (UE) in a wireless communication system supporting dual connectivity (DC), the method comprising:

performing, by the UE, a random access procedure with a base station (BS), the random access procedure comprising;

an initial attempt to transmit a random access preamble to the BS at an initial transmission power that is based on an initial value of a counter for power ramping, and

one or more subsequent attempts to transmit the random access preamble to the BS without incrementing the initial value of the counter for power ramping if the initial attempt does not result in an actual transmission due to a power allocation with regards to the DC.

2. The method of claim 1, wherein the random access procedure further comprises:

successfully transmitting the random access preamble to the BS based on the initial value of the counter for power ramping;

attempting to receive a random access response from the BS in response to the successfully transmitted random access preamble,

incrementing the value of the counter for power ramping and attempting to retransmit the random access preamble to the BS at a corresponding incremented transmission power if the random access response is not received.

3. The method of claim 2, wherein the incremented transmission power is related to the incremented value of the counter multiplied by a value of a power ramping step.

4. The method of claim 2, wherein the incrementing the value of the counter for power ramping is based on a received notification regarding increment the counter.

5. The method of claim 1, wherein the BS includes a first BS and a second BS, and

wherein the power allocation with regards to the DC is based on overlap in time between a first attempt to transmit the random access preamble to the first BS and a second attempt to transmit the random access preamble to the second BS.

6. A user equipment (UE) for operating in a wireless communication system supporting dual connectivity (DC), the UE comprising:

a memory;

a transceiver; and

a processor operatively connected to the memory and the transceiver, the processor for;

performing, by the UE, a random access procedure with a base station (BS), the random access procedure comprising;

an initial attempt to transmit a random access preamble to the BS at an initial transmission power that is based on an initial value of a counter for power ramping, and

one or more subsequent attempts to transmit the random access preamble to the BS without incrementing the initial value of the counter for power ramping if the initial attempt does not result in an actual transmission due to a power allocation with regards to the DC.

7. The UE of claim 6, wherein the random access procedure further comprises:

successfully transmitting the random access preamble to the BS based on the initial value of the counter for power ramping;

attempting to receive a random access response from the BS in response to the successfully transmitted random access preamble,

incrementing the value of the counter for power ramping and attempting to retransmit the random access preamble to the BS at a corresponding incremented transmission power if the random access response is not received.

8. The UE of claim 7, wherein the incremented transmission power is related to the incremented value of the counter multiplied by a value of a power ramping step.

9. The UE of claim 7, wherein the incrementing the value of the counter for power ramping is based on a received notification regarding increment the counter.

10. The UE of claim 6, wherein the BS includes a first BS and a second BS, and

wherein the power allocation with regards to the DC is based on overlap in time between a first attempt to transmit the random access preamble to the first BS and a second attempt to transmit the random access preamble to the second BS.