Method and apparatus for transmitting a handover report and an RLF report

Patent metadata

Field	Value
Publication number	US-10154535-B2
Application number	US-201815864253-A
Country	US
Kind code	B2
Filing date	Jan 8, 2018
Priority date	Apr 29, 2014
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A method for transmitting a handover report and for transmitting a radio link failure (RLF) report are provided. The method includes obtaining, by a target base station, at least one of location information of a source cell or location information of a user equipment (UE) history cell during a handover procedure, and transmitting, by the target base station, the handover report to at least one of a source base station or to a base station where the UE history cell is located, according to the obtained at least one of location information of the source cell or the location information of the UE history cell, wherein the handover report including at least one of an unnecessary handover report, a too early handover report, or a handover to wrong cell report.

First claim

What is claimed is:

1. A method by a first base station, the method comprising:
receiving a first message requesting an inter-radio access technology (RAT) handover from a source cell associated with a second base station to a target cell associated with the first base station, the first message including a tracking area identity (TAI), an identity (ID) of the second base station, and a cell ID of the source cell;
identifying whether the inter-RAT handover is unnecessary; and
transmitting, to the second base station, based on the TAI, the ID of the second base station and the cell ID of the source cell, a second message indicating that the inter-RAT handover is unnecessary if the inter-RAT handover is unnecessary, the second message being used to adjust at least one parameter of the second base station.

2. The method of claim 1 , wherein at least one of the following applies:
the second message includes the cell ID of the source cell and a cell ID of the target cell; and
the cell ID of the source cell includes an E-UTRAN cell global identifier (ECGI) and the ID of the second base station includes a global eNB ID.

3. The method of claim 1 , wherein the first message is received from the second base station via a mobility management entity (MME).

4. The method of claim 1 , further comprising:
instructing a user equipment (UE) to measure a second RAT associated with the second base station while being connected to a first RAT associated with the first base station; and
receiving, from the UE, a measurement report measured based on the instruction,
wherein whether the inter-RAT handover is unnecessary is identified based on the measurement report.

5. A method by a second base station, the method comprising:
transmitting a first message requesting an inter-radio access technology, RAT, handover from a source cell associated with the second base station to a target cell associated with a first base station, the first message including a tracking area identity (TAI), an identity (ID) of the second base station, and a cell ID of the source cell; and
receiving, from the first base station, based on the TAI, the ID of the second base station and the cell ID of the source cell, a second message indicating that the inter-RAT handover is unnecessary if the inter-RAT handover is unnecessary, the second message being used to adjust at least one parameter of the second base station.

6. The method of claim 5 , wherein at least one of the following applies:
the second message includes the cell ID of the source cell and a cell ID of the target cell; and
the cell ID of the source cell includes an E-UTRAN cell global identifier (ECGI) and the ID of the second base station includes a global eNB ID.

7. The method of claim 5 ,
wherein the first message is transmitted from the second base station to the first base station via a mobility management entity (MME),
wherein a user equipment (UE) is instructed to measure a second RAT associated with the second base station while being connected to a first RAT associated with the first base station, and
wherein a result of measuring the second RAT is used to identify whether the inter-RAT handover is unnecessary.

8. A first base station, the first base station comprising:
a transceiver; and
a controller configured to:
control the transceiver to receive a first message requesting an inter-radio access technology (RAT) handover from a source cell associated with a second base station to a target cell associated with the first base station, the first message including a tracking area identity (TAI), an identity (ID) of the second base station, and a cell ID of the source cell,
identify whether the inter-RAT handover is unnecessary, and
control the transceiver to transmit, to the second base station, based on the TAI, ID of the second base station, and the cell ID of the source cell, a second message indicating that the inter-RAT handover is unnecessary if the inter-RAT handover is unnecessary, the second message being used to adjust at least one parameter of the second base station.

9. The first base station of claim 8 , wherein at least one of the following applies:
the second message includes the cell ID of the source cell and a cell ID of the target cell, and
the cell ID of the source cell includes an E-UTRAN cell global identifier (ECGI) and the ID of the second base station includes a global eNB ID.

10. The first base station of claim 8 , wherein the first message is received from the second base station via a mobility management entity (MME).

11. The first base station of claim 8 , wherein the controller is configured to:
instruct a user equipment (UE) to measure a second RAT associated with the second base station while being connected to a first RAT associated with the first base station, and
receive, from the UE, a measurement report measured based on the instruction,
wherein whether the inter-RAT handover is unnecessary is identified based on the measurement report.

12. A second base station, the second base station comprises:
a transceiver for transmitting and receiving a signal; and
a controller configured to:
transmit a first message requesting an inter-radio access technology (RAT) handover from a source cell associated with the second base station to a target cell associated with a first base station, the first message including a tracking area identity (TAI), an identity (ID) of the second base station, and a cell ID of the source cell, and
receive, from the first base station, based on the TAI, the ID of the second base station, and the cell ID of the source cell, a second message indicating that the inter-RAT handover is unnecessary if the inter-RAT handover is unnecessary, the second message being used to adjust at least one parameter of the second base station.

13. The second base station of claim 12 , wherein the second message includes the cell ID of the source cell and a cell ID of the target cell.

14. The second base station of claim 12 , wherein the cell ID of the source cell includes an E-UTRAN cell global identifier, ECGI, and the ID of the second base station includes a global eNB ID.

15. The second base station of claim 12 ,
wherein the first message is transmitted from the second base station to the first base station via a mobility management entity (MME),
wherein a user equipment (UE) is instructed to measure a second RAT associated with the second base station while being connected to a first RAT associated with the first base station, and
wherein a result of measuring the second RAT is used to identify whether the inter-RAT handover is unnecessary.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Xu Lixiang
• Ke Xiaowan
• Wang Hong

Classifications

• H04W76/25 Primary

  Maintenance of established connections · CPC title

• H04W76/18

  Management of setup rejection or failure · CPC title

• H04W36/0058 Primary

  Transmission of hand-off measurement information, e.g. measurement reports · CPC title

• H04W36/0085

  Hand-off measurements · CPC title

• H04W36/0079

  in case of hand-off failure or rejection · CPC title