Apparatus and method for adjusting random access power control parameter

• US 10,075,983 B2
• Filed: 10/28/2016
• Issued: 09/11/2018
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Chen, Baojun, Xu, Li, Feng, Xin
• Primary Examiner(s): Duong, Duc T
• Application Number:
  US15/337,569
• Publication Number:
  US 20170048892A1
• Time in Patent Office: 683 Days
• Field of Search: None
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/0841 with collision treatment
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

The embodiment of the present invention provides an apparatus and a method for adjusting a control parameter. The method in the embodiment of the present invention includes: obtaining, by a base station, random access information reported by multiple user equipment (UEs), where the random access information includes a contention conflict indication and a number of times of sending a preamble; collecting, by the base station, statistics on the random access information including contention conflict indication indicating a non-contention conflict; determining, by the base station, a first random access probability according to the random access information including contention conflict indication indicating a non-contention conflict; and adjusting, by the base station, a first random access power control parameter according to the first random access probability, where the first random access power control parameter is a preamble-initial-received-target-power.

Claims

1. A method for adjusting a random access power control parameter, comprising:

obtaining, by a base station, random access information reported by multiple user equipment (UEs), wherein the random access information comprises a conflict indication and a number of times of sending a preamble;

collecting, by the base station, statistics on the random access information including a conflict indication indicating a non-contention conflict;

determining, by the base station, a first random access probability according to the random access information including the conflict indication indicating the non-contention conflict, wherein the first random access probability represents a probability of random access in which the number of times of sending a preamble is 1; and

adjusting, by the base station, a first random access power control parameter according to the first random access probability, wherein the first random access power control parameter is a preamble-initial-received-target-power.

2. The method according to claim 1, wherein the collecting, by the base station, statistics on the random access information including the conflict indication indicating the non-contention conflict comprises:

collecting statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtaining a number of times of random access in which the number of times of sending a preamble is 1; and

collecting statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtaining a sum of a number of times of random access; and

determining, by the base station, the first random access probability according to the random access information including the conflict indication indicating the non-contention conflict comprises;

using a quotient of the number of the times of random access in which the number of times of sending a preamble is 1 by the sum of quantities of times of random access as the first random access probability.

3. The method according to claim 1, wherein the adjusting, by the base station, a first random access power control parameter according to the first random access probability comprises:

when the first random access probability>

a maximum probability of successful random access in which the number of times of sending a preamble is 1, and a current preamble-initial-received-target-power>

(a preamble-initial-received-target-power before a first adjustment a maximum number of times of one-way adjustments for the preamble-initial-received-target-power*a step for adjusting the preamble-initial-received-target-power), adjust the preamble initial expected received power, wherein an adjusted preamble-initial-received-target-power=(the current preamble-initial-received-target-power the step for adjusting the preamble-initial-received-target-power).

4. The method according to claim 1, wherein the adjusting, by the base station, a first random access power control parameter according to the first random access probability comprises:

when the first random access probability<

a minimum probability of successful random access in which the number of times of sending a preamble is 1, and a current preamble-initial-received-target-power<

(a preamble-initial-received-target-power before a first adjustment+a maximum number of times of one-way adjustments for the preamble-initial-received-target-power*a step for adjusting the preamble-initial-received-target-power), adjust the preamble initial expected received power, wherein an adjusted preamble-initial-received-target-power=(the current preamble-initial-received-target-power+the step for adjusting the preamble-initial-received-target-power).

5. The method according to claim 1, wherein the method further comprises:

determining, by the base station, a second random access probability according to the random access information including the conflict indication indicating the non-contention conflict, wherein the second random access probability represents a probability of random access in which a number of times of retransmitting a preamble is 1 in all random access of retransmission; and

adjusting, by the base station, a second random access power control parameter according to the second random access probability, wherein the second random access power control parameter is a power ramping step.

6. The method according to claim 5, wherein collecting, by the base station, the statistics on the random access information including the conflict indication indicating the non-contention conflict comprises:

collecting statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtaining a number of times of random access in which the number of times of retransmitting a preamble is 1; and

collecting statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtaining a sum of quantities of times of all random access of retransmission; and

determining, by the base station, the second random access probability according to the random access information including the conflict indication indicating the non-contention conflict comprises;

using a quotient of the number of the times of random access in which the number of times of retransmitting a preamble is 1 by the sum of quantities of times of all random access of retransmission as the second random access probability.

7. The method according to claim 5, wherein adjusting, by the base station, the second random access power control parameter according to the second random access probability comprises:

when the second random access probability>

a maximum probability of successful random access in which the number of times of retransmitting a preamble is 1, and a current power ramping step>

2, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step−

2);

or

when the second random access probability<

a minimum probability of successful random access in which the number of times of retransmitting a preamble is 1, and a current power ramping step<

6, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step+2).

8. The method according to claim 1, wherein the method further comprises:

determining, by the base station, a preamble retransmission random access delay according to the random access information including the conflict indication indicating the non-contention conflict; and

adjusting, by the base station, a second random access power control parameter according to the preamble retransmission random access delay, wherein the second random access power control parameter is a power ramping step.

9. The method according to claim 8, wherein the preamble retransmission random access delay is

10. The method according to claim 8, wherein adjusting, by the base station, the second random access power control parameter according to the preamble retransmission random access delay comprises:

when the preamble retransmission random access delay<

a minimum value of an average preamble retransmission random access delay, and a current power ramping step>

2, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step−

2);

or

when the preamble retransmission random access delay>

a maximum value of an average preamble retransmission random access delay, and a current power ramping step<

6, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step+2).

11. An apparatus, comprising:

a transceiver, configured to obtain random access information reported by multiple user equipment (UEs), wherein the random access information comprises a conflict indication and a number of times of sending a preamble;

a memory, configured to store the random access information reported by the multiple UEs; and

a processor, configured to;

collect statistics on the random access information including a conflict indication indicating a non-contention conflict;

determine a first random access probability according to the random access information including the conflict indication indicating the non-contention conflict, wherein the first random access probability represents a probability of random access in which the number of times of sending a preamble is 1; and

adjust a first random access power control parameter according to the first random access probability, wherein the first random access power control parameter is a preamble-initial-received-target-power.

12. The apparatus according to claim 11, wherein when collecting statistics on the random access information including the conflict indication indicating the non-contention conflict, the processor is configured to:

collect statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtain a number of times of random access in which the number of times of sending a preamble is 1; and

collect statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtain a sum of a number of times of random access; and

when determining the first random access probability according to the random access information including the conflict indication indicating the non-contention conflict, the processor is configured to;

use a quotient of the number of the times of random access in which the number of times of sending a preamble is 1 by the sum of quantities of times of random access as the first random access probability.

13. The apparatus according to claim 11, wherein when adjusting the first random access power control parameter according to the first random access probability, the processor is configured to:

when the first random access probability>

a maximum probability of successful random access in which the number of times of sending a preamble is 1, and a current preamble-initial-received-target-power>

(a preamble-initial-received-target-power before a first adjustment−

a maximum number of times of one-way adjustments for the preamble-initial-received-target-power*a step for adjusting the preamble-initial-received-target-power), adjust the preamble initial expected received power, wherein an adjusted preamble-initial-received-target-power=(the current preamble-initial-received-target-power−

the step for adjusting the preamble-initial-received-target-power).

14. The apparatus according to claim 11, wherein when adjusting the first random access power control parameter according to the first random access probability, the processor is configured to:

when the first random access probability<

a minimum probability of successful random access in which the number of times of sending a preamble is 1, and a current preamble-initial-received-target-power<

(a preamble-initial-received-target-power before a first adjustment+a maximum number of times of one-way adjustments for the preamble-initial-received-target-power*a step for adjusting the preamble-initial-received-target-power), adjust the preamble initial expected received power, wherein an adjusted preamble-initial-received-target-power=(the current preamble-initial-received-target-power+the step for adjusting the preamble-initial-received-target-power).

15. The apparatus according to claim 11, wherein

the processor is further configured to:

determine a second random access probability according to the random access information including the conflict indication indicating the non-contention conflict, wherein the second random access probability represents a probability of random access in which a number of times of retransmitting a preamble is 1 in all random access of retransmission; and

adjust a second random access power control parameter according to the second random access probability, wherein the second random access power control parameter is a power ramping step.

16. The apparatus according to claim 15, wherein when collecting statistics on the random access information including the conflict indication indicating the non-contention conflict, the processor is configured to:

collect statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtain a number of times of random access in which the number of times of retransmitting a preamble is 1; and

collect statistics on the random access information including the conflict indication indicating the non-contention conflict, and obtain a sum of quantities of times of all random access of retransmission; and

when determining the second random access probability according to the random access information including the conflict indication indicating the non-contention conflict, the processor is configured to;

use a quotient of the number of the times of random access in which the number of times of retransmitting a preamble is 1 by the sum of quantities of times of all random access of retransmission as the second random access probability.

17. The apparatus according to claim 15, wherein when adjusting the second random access power control parameter according to the second random access probability, the processor is configured to:

when the second random access probability>

a maximum probability of successful random access in which the number of times of retransmitting a preamble is 1, and a current power ramping step>

2, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step−

2);

or

when the second random access probability<

a minimum probability of successful random access in which the number of times of retransmitting a preamble is 1, and a current power ramping step<

6, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step+2).

18. The apparatus according to claim 11, wherein

the processor is further configured to:

determine a preamble retransmission random access delay according to the random access information including the conflict indication indicating the non-contention conflict; and

adjust a second random access power control parameter according to the preamble retransmission random access delay, wherein the second random access power control parameter is a power ramping step.

19. The apparatus according to claim 18, wherein the preamble retransmission random access delay is

20. The apparatus according to claim 18, wherein when adjusting the second random access power control parameter according to the preamble retransmission random access delay, the processor is configured to:

when the preamble retransmission random access delay<

a minimum value of an average preamble retransmission random access delay, and a current power ramping step>

2, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step−

2);

or

when the preamble retransmission random access delay>

a maximum value of an average preamble retransmission random access delay, and a current power ramping step<

6, adjust the current power ramp step, wherein an adjusted power ramping step=(the current power ramping step+2).