Methods and apparatuses for cell configuration

Patent metadata

Field	Value
Publication number	US-10015820-B2
Application number	US-201514781230-A
Country	US
Kind code	B2
Filing date	Aug 4, 2015
Priority date	Aug 11, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A wireless device ( 120 ) and method for performing cell configuration. The wireless device and a first network node ( 111 ) serving the wireless device are operating in a wireless communications network ( 100 ), wherein the first network node manages a first serving cell ( 111 a ). When the wireless device is to send a second Random Access (RA) transmission in the first serving cell to the first network node while preparing to perform or performing configuration of a second serving cell managed by a second network node, the wireless device configures the second serving cell using a configuration time delay T act _ PSCell comprising at least a time delay T RA _ PCell due to the second RA transmission, otherwise the wireless device configures the second serving cell using the configuration time delay T act _ PSCell excluding the time delay T RA _ PCell due to the second RA transmission.

First claim

The invention claimed is:

1. A method performed by a wireless device for performing cell configuration, wherein the wireless device and a first network node serving the wireless device are operating in a wireless communications network, wherein the first network node manages a first serving cell, and wherein the method comprises:
when the wireless device is to send a Random Access (RA) transmission in the first serving cell to the first network node while preparing to perform or performing configuration of a second serving cell managed by a second network node, configuring the second serving cell within a first configuration time delay comprising at least a first time delay (TRA_PCell) due to the RA transmission in the first serving cell;
otherwise configuring the second serving cell within a second configuration time delay that does not include the first time delay.

2. The method of claim 1 , wherein the first configuration time delay further comprises a second time delay (TRA_PSCell) due to a RA transmission in the second serving cell managed by the second network node.

3. The method of claim 1 , further comprising:
determining whether the wireless device is required to send the RA transmission in the first serving cell to the first network node while performing configuration of the second serving cell;
selecting one of the first configuration time delay and the second configuration time delay based on the determination; and
configuring the second serving cell based on the selection.

4. The method of claim 3 , wherein selecting one of the first configuration time delay and the second configuration time delay based on the determination comprises:
selecting the second configuration time delay as a result of determining that the wireless device is not required to send the RA transmission in the first serving cell to the first network node while the wireless device is preparing to perform or is performing configuration of the second serving cell.

5. The method of claim 4 , wherein the second configuration time delay is expressed as:
T act_PSCell=α+ T RRC+ T act+ T SFNacq+ T RA_PSCell,

wherein α is a margin parameter, TRRC is a time delay due to a Radio Resource Control RRC, procedure, Tact is a time delay due to a second serving cell activation procedure, TSFNacq is a time delay due to a System Frame Number, SFN, acquisition procedure and TRA_PSCell is a time delay due to the RA transmission in the second serving cell managed by the second network node.

6. The method of claim 3 , wherein selecting one of the first configuration time delay and the second configuration time delay based on the determination comprises:
selecting the first configuration time delay as a result of determining that the wireless device is to send the RA transmission in the first serving cell to the first network node while the wireless device is preparing to perform or is performing configuration of the second serving cell.

7. The method of claim 6 , wherein the first configuration time delay is expressed as:
T act_PSCell=β+ T RRC+ T act+ T SFNacq+ T RA_PSCell+ T RA_PCell* K,

wherein β is a margin parameter, TRRC is a time delay due to a RRC procedure, Tact is a time delay due to a second serving cell activation procedure, TSFNacq is a time delay due to a SFN acquisition procedure, TRA_PSCell is a time delay due to the RA transmission in the second serving cell, TRA_PCell is a time delay due to the RA transmission in the first serving cell and K is an integer defining a number of RA transmissions in the first serving cell to be sent while the wireless device is preparing to perform or is performing configuration of the second serving cell.

8. The method of claim 7 , further comprising:
when K is equal to or larger than 1, transmitting the RA transmission in the first serving cell with priority over transmitting the RA transmission in the second serving cell.

9. The method of claim 6 , further comprising:
transmitting the RA transmission in the first serving cell using a non-contention based Physical Radio Access Channel, PRACH.

10. The method of claim 6 , further comprising:
transmitting the RA transmission in the first serving cell when required to be transmitted for performing or enabling one or more of: a positioning measurement, a timing advance measurement, an activation, an incoming call, a handover, and a cell change acquisition of uplink transmit timing.

11. The method of claim 6 , further comprising:
transmitting the RA transmission in the first serving cell in dependence of a target configuration delay time for the configuration of the second serving cell.

12. A computer program product comprising non-transitory computer readable storage medium comprising a computer program comprising instructions which, when executed on at least one processor, causes the at least one processor to carry out the method according to claim 1 .

13. A wireless device for performing cell configuration, wherein the wireless device and a first network node serving the wireless device are operable in a wireless communications network, wherein the first network node manages a first serving cell, the wireless device comprising:
a memory; and
a processor coupled to the memory, wherein the wireless device is configured to:
when the wireless device is to send a Random Access (RA) transmission in the first serving cell to the first network node while preparing to perform or performing configuration of a second serving cell managed by a second network node, configure the second serving cell within a first configuration time delay comprising at least a first time delay (TRA_PCell) due to the RA transmission in the first serving cell;
otherwise configuring the second serving cell within a second configuration time delay that does not include the first time delay.

14. The wireless device of claim 13 , wherein the first configuration time delay further comprises a second time delay (TRA_PSCell) due to a RA transmission in the second serving cell managed by the second network node.

15. The wireless device of claim 13 , further being configured to:
determine whether the wireless device is required to send the RA transmission in the first serving cell to the first network node while performing configuration of the second serving cell;
select one of the first configuration time delay and the second configuration time delay based on the determination; and
configure the second serving cell based on the selection.

16. The wireless device of claim 15 , wherein the wireless device is configured to select one of the first configuration time delay and the second configuration time delay based on the determination by performing a procedure comprising:
selecting the second configuration time delay as a result of determining that the wireless device is not required to send the RA transmission in the first serving cell to the first network node while the wireless device is preparing to perform or is performing configuration of the second serving cell.

17. The wireless device of claim 16 , wherein the second configuration time delay is expressed as:
T act_PSCell=α+ T RRC+ T act+ T SFNacq+ T RA_PSCell,

wherein α is a margin parameter, TRRC is a time delay due to a Radio Resource Control RRC, procedure, Tact is a time delay due to a second serving cell activation procedure, TSFNacq is a time delay due to a System Frame Number, SFN, acquisition procedure and TRA_PSCell is a time delay due to the RA transmission in the second serving cell managed by the second network node.

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Assignees

• Ericsson Telefon Ab L M
• Ericsson Telefon Ab L M

Inventors

• Rahman Imadur
• Axmon Joakim
• Kazmi Muhammad

Classifications

• H04W88/08

  Access point devices · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04L5/0005 Primary

  Time-frequency · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04W84/042

  Public Land Mobile systems, e.g. cellular systems · CPC title