Mobility operation in LTE

Patent metadata

Field	Value
Publication number	US-9699701-B2
Application number	US-201313742308-A
Country	US
Kind code	B2
Filing date	Jan 15, 2013
Priority date	Aug 10, 2012
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. In an aspect, the apparatus establishes a first and/or second communication link with at least a first cell. The first communication link may be for receiving transmissions and the second communication link may be for sending transmissions. The apparatus performs a handover of one of the first and second communication links to at least a second cell. The apparatus determines a value of a parameter after the handover is performed based on a value of the parameter prior to the handover. In another aspect, the apparatus establishes a first and/or second communication link with at least a first cell. The first communication link may be for receiving transmissions and the second communication link may be for sending transmissions. In such aspect, a virtual cell ID is reconfigured for one of the first and second communication links.

First claim

What is claimed is:

1. A method of wireless communication comprising:
establishing at least one of first and second communication links with at least a first cell, the first communication link for receiving transmissions and the second communication link for sending transmissions;
performing a handover of one of the first and second communication links to at least a second cell;
determining, by a user equipment (UE), a value of a parameter associated with the second communication link after the handover of the first communication link is performed, the determination of the value of the parameter is based on a value of the parameter associated with the second communication link prior to the handover;
maintaining at least one of a transmit power control setting or a timing advance setting associated with the second communication link when the handover of the first communication link is performed; and
performing a configuration operation, wherein the configuration operation includes adjusting at least one of a transmit power control setting or a timing advance setting associated with the second communication link when the handover of the first communication link is performed, the adjustment being based on an offset.

2. The method of claim 1 , wherein the establishing comprises establishing the first communication link with the first cell and the second communication link with the second cell, and the handover includes handing over the first communication link to the second cell.

3. The method of claim 1 , wherein the establishing comprises establishing the second communication link with the first cell and the first communication link with the second cell, and the handover includes handing over the second communication link to the second cell.

4. The method of claim 1 , wherein the establishing comprises establishing the first and second communication links with the first cell.

5. The method of claim 1 , wherein the adjustment of the transmit power control setting is performed in response to a self generated command or a command received via the first communication link.

6. The method of claim 1 , further comprising receiving a physical downlink control channel (PDCCH) order for initiating the handover of the first communication link, the PDCCH order indicating at least one of whether to reset a timing advance or a transmit power control setting after the handover is performed, whether a new reference signal is used for at least one of a timing advance or power control reference, whether at least one of a physical random access channel (PRACH) procedure or a random access response (RAR) grant is omitted, and whether a new PRACH format is used.

7. The method of claim 1 , further comprising refraining from performing a physical random access channel (PRACH) procedure when the handover of the first communication link is performed.

8. The method of claim 1 , further comprising performing a new physical random access channel (PRACH) procedure when the handover of the first communication link is performed.

9. The method of claim 1 , further comprising omitting at least one of a cell radio network temporary identifier (C-RNTI) change or a random access response (RAR) grant when the handover of the first communication link is performed.

10. The method of claim 1 , further comprising receiving an explicit or implicit indication that the second communication link with the first cell is to be maintained after the handover is performed.

11. The method of claim 1 , wherein the parameter is a physical downlink shared channel (PDSCH) rate matching parameter and wherein the value of the parameter after the handover is performed is determined to be the same as the value of the parameter prior to the handover when the handover of the second communication link is performed.

12. The method of claim 1 , further comprising receiving a message via the first communication link indicating a use of a new reference signal (RS) for at least one of open loop power control or timing when the handover of the second communication link is performed.

13. The method of claim 1 , wherein the parameter is associated with the other of the one of the first and second communication links involved in the handover.

14. The method of claim 13 , wherein the parameter is a power control parameter for an uplink (UL), a timing parameter for the UL, a cell radio network temporary identifier (C-RNTI), or a rate matching parameter for a physical downlink shared channel (PD SCH).

15. A method of wireless communication comprising:
establishing at least one of first and second communication links with at least a first cell, the first communication link for receiving transmissions and the second communication link for sending transmissions;
determining, by a user equipment (UE), whether a virtual cell ID is reconfigured for one of the first and second communication links; and
maintaining physical downlink shared channel (PDSCH) rate matching parameters based on determining that the virtual cell ID is reconfigured for the second communication link.

16. The method of claim 15 , further comprising maintaining at least one of a transmit power control setting or a timing advance setting associated with the second communication link when the virtual cell ID is reconfigured for the first communication link.

17. The method of claim 15 , further comprising receiving a message via the first communication link indicating a use of a new reference signal (RS) for at least one of open loop power control and timing when the virtual cell ID is reconfigured for the second communication link.

18. The method of claim 15 , further comprising determining a value of a parameter after the virtual cell ID is reconfigured based on a value of the parameter prior to the virtual cell ID is reconfigured.

19. An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:
means for establishing at least one of first and second communication links with at least a first cell, the first communication link for receiving transmissions and the second communication link for sending transmissions;
means for performing a handover of one of the first and second communication links to at least a second cell;
means for determining, by a user equipment (UE), a value of a parameter associated with the second communication link after the handover of the first communication link is performed, the determination of the value of the parameter is based on a value of the parameter associated with the second communication link prior to the handover;
means for maintaining at least one of a transmit power control setting or a timing advance setting associated with the second communication link when the handover of the first communication link is performed; and
means for performing a configuration operation, wherein the configuration operation includes adjusting at least one of a transmit power control setting or a timing advance setting associated with the second communication link when the handover of the first communication link is performed, the adjustment being based on an offset.

20. The apparatus of claim 19 , wherein the means for establishing is configured to establish the first communication link with the first cell and the second communication link with the second cell, and the handover includes handing over the first communication link to the second cell.

21. The apparatus of claim 19 , wherein the means for establishing is configured to establish the second commu

Assignees

• Qualcomm Inc

Inventors

• Chen Wanshi
• Gaal Peter
• Xu Hao
• Luo Tao

Classifications

• H04W36/06 Primary

  Reselecting a communication resource in the serving access point · CPC title

• H04W36/24 Primary

  Reselection being triggered by specific parameters · CPC title

• H04W36/28

  involving a plurality of connections, e.g. multi-call or multi-bearer connections · CPC title

• H04W36/00695

  using split of the control plane or user plane · CPC title