Method and device for performing handover in wireless communication system

Patent metadata

Field	Value
Publication number	US-11147001-B2
Application number	US-201816630672-A
Country	US
Kind code	B2
Filing date	May 25, 2018
Priority date	Jul 13, 2017
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). According to various embodiments of the present disclosure, a device of a terminal in a wireless communication system can include at least one transceiver and at least one processor operationally coupled with at least one transceiver. At least one processor can receive configuration information from a first network node for a first radio access technology (RAT), measure a first quality for a first signal of the first RAT and a second quality for a second signal of a second RAT on the basis of the received configuration information, and determine, whether a handover to a second network for the second RAT is performed, on the basis of the measured first quality or the measured second quality. The configuration information can include parameters for the handover between the first RAT and the second RAT.

First claim

The invention claimed is:

1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving configuration information from a first network node for a first radio access technology (RAT);
measuring a first quality for a first signal of the first RAT and a second quality for a second signal of a second RAT, based on the received configuration information; and
determining whether to perform a handover to a second network node for the second RAT or not, based on at least one of the first quality or the second quality,
wherein the configuration information includes at least one parameter for a handover between the first RAT and the second RAT,
wherein the configuration information is received with a quality of service class identifier (QCI) of a same quality of service (QoS) as a QoS on a bearer configured in the terminal, and
wherein the at least one parameter comprises a time unit parameter for measuring the first quality and the second quality.

2. The method as claimed in claim 1 , wherein the first RAT provides a cellular network, and the second RAT provides a wireless local area network (WLAN).

3. The method as claimed in claim 1 ,
wherein the first RAT provides a wireless local area network (WLAN), and
wherein the second RAT provides a cellular network.

4. The method as claimed in claim 3 , further comprising:
transmitting, to the first network node, an action frame for requesting the configuration information,
wherein the action frame comprises an information element (IE) indicating requesting the at least one parameter for the handover.

5. The method as claimed in claim 4 , wherein the configuration information is transmitted to the terminal through a vendor specific content field of the action frame.

6. The method as claimed in claim 1 , wherein the at least one parameter further comprises:
a trigger parameter indicating a metric for the first quality or the second quality;
a persistence parameter indicating a duration in which a specific condition for the first quality or the second quality is required to be maintained, for the handover to the second network node;
a hysteresis value for a handover according to the specific condition;
an offset value for the handover according to the specific condition;
at least one threshold value for the specific condition; and
measurement parameters related to measurement of the first quality or the second quality.

7. The method as claimed in claim 6 , wherein the specific condition is at least one of a plurality of conditions for the first quality or the second quality, and the at least one threshold value is differently configured for each of the plurality of conditions.

8. The method as claimed in claim 6 , wherein the measurement parameters comprise at least one of a parameter related to a measurement interval or a parameter related to a number of measurements.

9. The method as claimed in claim 1 ,
wherein the determining of whether to perform the handover to the second network node comprises determining to perform the handover to the second network node when a first condition for the first quality and the second quality is satisfied for a predetermined duration, and
wherein the at least one parameter for the handover comprises a parameter indicating the predetermined duration.

10. A device of a network node in a wireless communication system, the device comprising:
at least one transceiver; and
at least one processor operably coupled with the at least one transceiver,
wherein the at least one processor is configured to:
control the at least one transceiver to receive a message for requesting configuration information from a terminal connected to the network node, and
control the at least one transceiver to transmit the configuration information including at least one parameters for a handover between a first radio access technology (RAT) for the network node and a second RAT for another network node,

wherein the first RAT provides a wireless local area network (WLAN),
wherein the second RAT provides a cellular network,
wherein the configuration information is transmitted with a quality of service class identifier (QCI) of a same quality of service (QoS) as a QoS on a bearer configured in the terminal, and
wherein the at least one parameter comprises a time unit parameter for measuring a first quality for a first signal of the first RAT and a second quality for a second signal of the second RAT.

11. A terminal in a wireless communication system, the terminal comprising:
at least one transceiver; and
at least one processor operably coupled with the at least one transceiver,
wherein the at least one processor is configured to:
control the at least one transceiver to receive configuration information from a first network node for a first radio access technology (RAT),
measure a first quality for a first signal of the first RAT and a second quality for a second signal of a second RAT, based on the received configuration information, and
determine whether to perform a handover to a second network node for the second RAT or not, based on at least one of the first quality or the second quality, and

wherein the configuration information includes at least one parameter for a handover between the first RAT and the second RAT,
wherein the configuration information is received with a quality of service class identifier (QCI) of a same quality of service (QoS) as a QoS on a bearer configured in the terminal, and
wherein the at least one parameter comprises a time unit parameter for measuring the first quality and the second quality.

12. The terminal of claim 11 ,
wherein the first RAT provides a cellular network, and
wherein the second RAT provides a wireless local area network (WLAN).

13. The terminal of claim 11 ,
wherein the first RAT provides a wireless local area network (WLAN), and
wherein the second RAT provides a cellular network.

14. The terminal of claim 13 ,
wherein the at least one processor is further configured to:
control the at least one transceiver to transmit, to the first network node, an action frame for requesting the configuration information, and

wherein the action frame comprises an information element (IE) indicating requesting the at least one parameter for the handover.

15. The terminal of claim 14 , wherein the configuration information is transmitted to the terminal through a vendor specific content field of the action frame.

16. The terminal of claim 11 , wherein the at least one parameter further comprises:
a trigger parameter indicating a metric for the first quality or the second quality;
a persistence parameter indicating a duration in which a specific condition for the first quality or the second quality is required to be maintained, for the handover to the second network node;
a hysteresis value for the handover according to the specific condition;
an offset value for the handover according to the specific condition;
at least one threshold value for the specific condition; and
measurement parameters related to measurement of the first quality or the second quality.

17. The terminal of claim 16 ,
wherein the specific condition is at least one of a plurality of conditions for the first quality or the second quality, and
wherein the at least one threshold value is differently configured for each of the plurality of conditions.

18. The terminal of claim 16 , wherein the measurement parameters comprise at least one of a parameter related to a measurement interval or param

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Jihyeon
• Park Jongho
• Won Sangyeon
• Kim Hanseok
• Lee Daewoo

Classifications

• H04W36/0058

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

• H04W36/00837

  Determination of triggering parameters for hand-off · CPC title

• H04W36/1446

  wherein at least one of the networks is unlicensed · CPC title

• H04W36/304

  due to measured or perceived resources with higher communication quality · CPC title

• H04W36/362

  Conditional handover · CPC title