Performing multiple timing advance adjustments in a carrier aggregation communication system

Patent metadata

Field	Value
Publication number	US-9398551-B2
Application number	US-201113994743-A
Country	US
Kind code	B2
Filing date	Sep 30, 2011
Priority date	Apr 1, 2011
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

Technology for performing multiple timing advances in a carrier aggregation communication system is disclosed. A method comprises communicating a random access preamble from a UE to an eNodeB via a PCell associated with a selected component carrier of the carrier aggregation. A Random Access Response (RAR) is received at the UE from the eNodeB for the PCell. The RAR contains a timing advance adjustment instructing the UE to adjust a timing of a PCell wireless communication. A request is received at the UE to adjust a timing of an SCell communication. A random access preamble is communicated to the UE via the SCell. An RAR is received at the UE from the eNodeB for the SCell to adjust a timing advance of the SCell wireless communication.

First claim

What is claimed is:

1. A method for adjusting a timing of a wireless communication in a wireless communication system configured for carrier aggregation, comprising:
communicating a random access preamble in an uplink from a user equipment (UE) to an eNodeB via a Primary Cell (PCell) associated with a selected component carrier of the carrier aggregation;
receiving a Random Access Response (RAR) at the UE from the eNodeB for the PCell, wherein the RAR contains a timing advance adjustment instructing the UE to adjust a timing of a PCell wireless communication;
receiving a request at the UE to adjust a timing of a Secondary Cell (SCell) wireless communication associated with a second component carrier of the carrier aggregation;
communicating a random access preamble in an uplink from the UE to the eNodeB via the SCell; and
receiving an RAR at the UE from the eNodeB for the SCell, wherein the RAR contains a timing advance adjustment instructing the UE to adjust a timing of the SCell wireless communication.

2. The method of claim 1 , further comprising receiving the request at the UE to adjust the timing of the SCell after the SCell is activated at the UE.

3. The method of claim 1 , further comprising receiving the request at the UE to adjust the timing of the SCell communication via a physical downlink control channel (PDCCH) sent on the PCell.

4. The method of claim 3 , further comprising receiving the request via the PDCCH, wherein the request includes an identification mechanism to identify which secondary cell the timing advance adjustment is for.

5. The method of claim 3 , further comprising receiving the request via the PDCCH, wherein the request includes a 3 bit cell index used to indicate on which SCell to initiate a random access channel (RACH) procedure.

6. The method of claim 1 , wherein receiving the RAR at the UE from the eNodeB for the PCell further comprises receiving an 11 bit timing advance in a Medium Access Control (MAC) RAR and a Cell Radio Network Temporary Identifier (C-RNTI) for the PCell.

7. The method of claim 1 , wherein receiving the RAR at the UE from the eNodeB for the SCell further comprises receiving an 11 bit timing advance adjustment in a Medium Access Control (MAC) RAR, but not receiving a Cell Radio Network Temporary Identifier (C-RNTI) for the SCell.

8. The method of claim 1 , wherein receiving the RAR at the UE from the eNodeB for the SCell further comprises receiving the RAR at the UE via at least one of the SCell and the PCell.

9. The method of claim 1 , further comprising maintaining a timing advance adjustment at the SCell by receiving a timing advance Medium Access Control (MAC) Control Element that contains a minor timing advance adjustment instructing the UE to adjust a timing of the SCell wireless communication.

10. The method of claim 9 , further comprising receiving the MAC Control Element, wherein the Control Element includes an octet comprising a 6-bit timing advance adjustment command and two bits to indicate a cell index associated with a specific SCell or a Timing Advance (TA) index value.

11. The method of claim 9 , further comprising receiving the MAC Control Element, wherein the MAC Control Element includes a first octet comprising a 6 bit timing advance adjustment and a second octet comprising a 3 bit identification value used to identify at least one of an SCell, a group of SCells, and a Timing Advance index value.

12. The method of claim 1 , further comprising:
communicating a random access preamble in an uplink from the UE to the eNodeB via an additional SCell; and
receiving an RAR at the UE from the eNodeB for the additional SCell, wherein the RAR contains a timing advance adjustment instructing the UE to adjust a timing of an additional SCell wireless communication.

13. A computer program product, comprising a non-transitory computer readable storage medium having a computer readable program code embodied therein, the computer readable program code, when executed by a processor implements the method of claim 1 .

14. A method for performing a timing advance adjustment on a wireless communication in a wireless communication system configured for carrier aggregation, comprising:
receiving a random access preamble in an uplink from a user equipment (UE) at an eNodeB via a Primary Cell (PCell) associated with a selected component carrier of the carrier aggregation;
transmitting a Random Access Response (RAR) from the eNodeB to the UE for the PCell and at least one SCell associated with an additional component carrier of the carrier aggregation, wherein the RAR contains a timing advance adjustment instructing the UE to adjust a timing of a PCell wireless communication and at least one SCell wireless communication based on a propagation distance of the UE to the eNodeB via the PCell;
detecting a timing of the PCell wireless communication and the at least one SCell wireless communication at the eNodeB; and
transmitting a separate timing advance Medium Access Control (MAC) Control Element (CE) to the UE for the PCell and the at least one SCell, wherein each separate timing advance MAC CE contains a minor timing advance adjustment instructing the UE to adjust a timing of a PCell wireless communication and the at least one SCell wireless communication based on the detected timing.

15. The method of claim 14 , further comprising transmitting the MAC Control Element, wherein the Control Element includes an octet comprising a 6 bit timing advance adjustment and two bits to identify at least one of the PCell, the SCell, a group of SCells, and a timing advance (TA) index value.

16. The method of claim 14 , further comprising transmitting the MAC Control Element, wherein the Control Element includes a first octet comprising a 6 bit timing advance adjustment and a second octet comprising a 3 bit cell identification value used to identify at least one of the PCell, the SCell, a group of SCells, and a timing advance (TA) index value.

17. The method of claim 14 , wherein transmitting the Random Access Response (RAR) from the eNodeB to the UE for the PCell and the at least one SCell further comprises transmitting the RAR to the UE via at least one of the PCell wireless Communication on the selected component carrier and the at least one SCell wireless communication on the additional component carrier.

18. The method of claim 14 , wherein transmitting the separate timing advance Medium Access Control (MAC) Control Element (CE) to the UE for the PCell and the at least one SCell further comprises transmitting each separate MAC CE to the UE via at least one of the PCell wireless Communication on the selected component carrier and the at least one SCell wireless communication on at least one additional component carrier.

19. The method of claim 14 , further comprising:
detecting the timing of the PCell wireless communication and the at least one SCell wireless communication at the eNodeB after the timing advance adjustment is performed; and
transmitting an additional timing advance Medium Access Control (MAC) Control Element (CE) to at least one of the UE for the PCell and the at least one SCell to perform an additional timing advance adjustment when the detected timing is off my more than a predetermined amount.

20. The method of claim 14 , wherein the timing advance adjustment comprises adjusting a timing of at least one of the PCell wireless communication and the at least one SCell wireless communication in a positive or negative direction relative to a clock in the eNode B.

Assignees

• Fwu Jong-Kae
• Niu Huaning
• Wang Ping
• Yang Xiangying
• Etemad Kamran
• Intel Corp

Inventors

• Fwu Jong-Kae
• Niu Huaning
• Wang Ping
• Yang Xiangying
• Etemad Kamran

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W72/042

  Electricity · mapped topic