WIRELESS COMMUNICATION DEVICE, A NETWORK NODE AND METHODS THEREIN FOR IMPROVED RANDOM ACCESS

• US 20160338109A1
• Filed: 05/12/2015
• Published: 11/17/2016
• Est. Priority Date: 11/04/2014
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: RAHMAN, Imadur, KAZMI, Muhammad
• Granted Patent: US 9,730,248 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 56/005 compensating for timing error by adjustment in the receiver
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/16 Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer

Abstract

Embodiments herein relate to a communication device and a method performed by the communication device for enabling improved random access transmissions in a radio communications network. The communication device obtains information indicating a first random access channel configuration and also obtains information indicating at least a second random access channel configuration. Then, the communication device determine whether or not the at least second random access channel configuration is orthogonal to the first random access channel configuration. Furthermore, the communication device uses the result of the determining to determine the time required by the communication device to configure the at least second cell.

Embodiments herein also relate to a first network node and a method therein for enabling improved random access transmissions in a radio communications network.

Claims

1. A method performed by a communication device for enabling improved random access transmissions in a radio communications network, the communication device being configurable for dual connectivity in a first cell of a first network node and at least a second cell of at least a second network node, the method comprising;

obtaining information indicating a first random access channel configuration used in the first cell;

obtaining information indicating at least a second random access channel configuration used in the at least second cell;

determining whether or not the at least second random access channel configuration is orthogonal to the first random access channel configuration; and

using the result of the determining to determine the time required by the communication device to configure the at least second cell.

2. The method of claim 1, wherein the time (T1) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is orthogonal to the first random access channel configuration is shorter than the time (T2) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is not orthogonal to the first random access channel configuration.

3. The method of claim 1, wherein:

the time (T1) required by the communication device to configure the at least second cell does not include the time to perform random access on the first cell; and

the time (T2) required by the communication device to configure the at least second cell includes the time to perform random access on the first cell.

4. The method of claim 1, wherein the time (T1) and the time (T2) required by the communication device to configure the at least second cell are determined by the communication device based on a pre-defined rule.

5. The method of claim 1, wherein the first random access channel configuration and the at least second random access channel configuration are orthogonal with respect to each other when random access transmissions from the communication device according to the first random access channel configuration do not overlap in time with random access transmissions from the communication device according to at least second random access channel configuration.

6. The method of claim 1, wherein the first cell belongs to a Master Cell Group, MCG, and the second cell belongs to a Secondary Cell Group, SCG.

7. A communication device for enabling improved random access transmissions in a radio communications network, the communication device is being configurable for dual connectivity in a first cell of a first network node and at least a second cell of at least a second network node, the communication device being configured to:

obtain information indicating a first random access channel configuration used in the first cell;

obtain information indicating at least a second random access channel configuration used in the at least second cell;

determine whether or not the at least second random access channel configuration is orthogonal to the first random access channel configuration; and

use the result of the determining to determine the time required by the communication device to configure the at least second cell.

8. The communication device of claim 7, wherein the time (T1) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is orthogonal to the first random access channel configuration is shorter than the time (T2) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is not orthogonal to the first random access channel configuration.

9. The communication device of claim 7, wherein:

the time (T1) required by the communication device to configure the at least second cell does not include the time to perform random access on the first cell; and

the time (T2) required by the communication device to configure the at least second cell includes the time to perform random access on the first cell.

10. The communication device of claim 7, wherein the communication device is configured to determine the time (T1) and the time (T2) required by the communication device to configure the at least second cell based on a pre-defined rule.

11. The communication device of claim 7, wherein the first random access channel configuration and the at least second random access channel configuration are orthogonal when random access transmissions from the communication device according to the first random access channel configuration do not overlap in time with random access transmissions from the communication device according at least second random access channel configuration.

12. The communication device of claim 7, further comprising a processor and a memory, wherein the memory contains instructions executable by the processor to:

obtain information indicating the first random access channel configuration used in the first cell;

obtain information indicating at least the second random access channel configuration used in the at least second cell;

determine whether or not the at least second random access channel configuration is orthogonal to the first random access channel configuration; and

use the result of the determining to determine the time required by the communication device to configure the at least second cell.

13. A method performed by a first network node for enabling improved random access transmissions of a communication device in a radio communications network, the communication device being configurable for dual connectivity in a first cell of the first network node and at least a second cell of at least a second network node, the method comprising;

obtaining information indicating at least a second random access channel configuration used in the at least second cell; and

determining whether or not the at least second random access channel configuration is orthogonal to a first random access channel configuration in the first cell; and

using the result of the determining to determine the time required by the communication device to configure the at least second cell.

14. The method of claim 13, wherein the time (T1) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is orthogonal to the first random access channel configuration is shorter than the time (T2) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is not orthogonal to the first random access channel configuration.

15. The method of claim 13, wherein:

the time (T1) required by the communication device to configure the at least second cell does not include the time to perform random access on the first cell; and

the time (T2) required by the communication device to configure the at least second cell includes the time to perform random access on the first cell.

16. The method of claim 13, wherein the time (T1) and the time (T2) required by the communication device to configure the at least second cell are determined by the first network node based on a pre-defined rule.

17. The method of claim 13, wherein the first random access channel configuration and the at least second random access channel configuration are orthogonal with respect to each other when random access transmissions from the communication device according to the first random access channel configuration do not overlap in time with random access transmissions from the communication device according to at least second random access channel configuration.

18. The method of claim 13, wherein the first cell belongs to a Master Cell Group, MCG, and the second cell belongs to a Secondary Cell Group, SCG.

19. A first network node for enabling improved random access transmissions of a communication device in a radio communications network, wherein the communication device is being configurable for dual connectivity in a first cell of the first network node and at least a second cell of at least a second network node, the first network node being configured to:

obtain information indicating at least a second random access channel configuration used in the at least second cell;

determine whether or not the at least second random access channel configuration is orthogonal to a first random access channel configuration in the first cell; and

use the result of the determining to determine the time required by the communication device to configure the at least second cell.

20. The first network node of claim 19, wherein the time (T1) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is orthogonal to the first random access channel configuration is shorter than the time (T2) required by the communication device to configure the at least second cell when the result of the determining is that the second random access channel configuration is not orthogonal to the first random access channel configuration.

21. The first network node of claim 19, wherein:

the time (T1) required by the communication device to configure the at least second cell does not include the time to perform random access on the first cell; and

the time (T2) required by the communication device to configure the at least second cell includes the time to perform random access on the first cell.

22. The first network node of claim 19, wherein the first network node is configured to determine the time (T1) and the time (T2) required by the communication device to configure the at least second cell based on a pre-defined rule.

23. The first network node of claim 19, wherein the first random access channel configuration and the at least second random access channel configuration are orthogonal when random access transmissions from the communication device according to the first random access channel configuration do not overlap in time with random access transmissions from the communication device according at least second random access channel configuration.

24. The first network node of claim 19, further comprising a processor and a memory wherein the memory contains instructions executable by the processor to:

obtain the information indicating at least the second random access channel configuration used in the at least second cell;

determine whether or not the at least second random access channel configuration is orthogonal to the first random access channel configuration in the first cell; and

use the result of the determining to determine the time required by the communication device to configure the at least second cell.

25. A computer program product, comprising instructions which, when executed by at least one processor, cause the at least one processor to carry out a method on a communication device for enabling improved random access transmissions in a radio communications network, the communication device being configurable for dual connectivity in a first cell of a first network node and at least a second cell of at least a second network node, the method comprising:

obtaining information indicating a first random access channel configuration used in the first cell;

obtaining information indicating at least a second random access channel configuration used in the at least second cell;

determining whether or not the at least second random access channel configuration is orthogonal to the first random access channel configuration; and

using the result of the determining to determine the time required by the communication device to configure the at least second cell.

26. (canceled)

27. A computer program product, comprising instructions which, when executed by at least one processor, cause the at least one processor to carry out a method on a first network node for enabling improved random access transmissions of a communication device in a radio communications network, the communication device being configurable for dual connectivity in a first cell of the first network node and at least a second cell of at least a second network node, the method comprising:

obtaining information indicating at least a second random access channel configuration used in the at least second cell;

determining whether or not the at least second random access channel configuration is orthogonal to a first random access channel configuration in the first cell; and

using the result of the determining to determine the time required by the communication device to configure the at least second cell.