Handling of conditional reconfiguration delay

Patent metadata

Field	Value
Publication number	US-2023140745-A1
Application number	US-202117915552-A
Country	US
Kind code	A1
Filing date	Apr 9, 2021
Priority date	Apr 9, 2020
Publication date	May 4, 2023
Grant date	—

Abstract

A first network node in a communication network can communicate with a second network node to configure a conditional handover (“CHO”) for a communication device. The first network node can, responsive to communicating with the second network node to configure the CHO, determine a conditional reconfiguration delay.

First claim

1 . A method of operating a first network node in a communication network, the method comprising:
communicating with a second network node regarding configuration of a conditional handover, CHO, for a communication device; and responsive to communicating with the second network node, determining a delay associated with the CHO.

2 . The method of claim 1 , wherein communicating with the second network node comprises communicating with the second network node to configure the CHO, and
wherein determining the delay comprises determining a conditional reconfiguration delay.

3 . The method of claim 2 , wherein the first network node is a source network node and the second network node is a target network node candidate.

4 . The method of claim 3 , wherein communicating with the second network node to configure the CHO comprises:
transmitting to the target network node candidate a handover, HO, request message comprising an indication that the HO request message is associated with a CHO; and receiving a HO request acknowledge message from the target network node candidate, and wherein the conditional reconfiguration delay is a preparation delay associated with a time between transmission of the HO request message and reception of the HO request acknowledge message.

5 . (canceled)

6 . The method of any of claim 4 , wherein the conditional reconfiguration delay is a CHO validity delay associated with a time duration for which CHO resources in the target network node candidate have been reserved before a CHO execution occurred.

7 . The method of claim 6 , further comprising:
transmitting a radio resource control, RRC, reconfiguration message to the communication device, the RRC reconfiguration message comprising CHO configuration; and responsive to transmitting the RRC reconfiguration message, receiving a HO success message from the target network node candidate wherein determining the CHO validity delay comprises measuring at least one of:
an amount of time between receiving the HO request acknowledge message and receiving the HO success message; and
an amount of time between transmitting the HO request message and receiving the HO success message.

8 - 9 . (canceled)

10 . The method of claim 6 , further comprising:
transmitting a radio resource control, RRC, reconfiguration message to the communication device, the RRC reconfiguration message comprising CHO configuration; and responsive to transmitting the RRC reconfiguration message, transmitting a HO cancel message to the target network node candidate wherein determining the CHO validity delay comprises measuring an amount of time between transmitting the HO request message and transmitting the HO cancel message.

11 . (canceled)

12 . The method of any of claim 6 , wherein determining the CHO validity delay comprises measuring an amount of time between transmitting the HO request message and an internal event of the source network node; or
wherein determining the conditional reconfiguration delay comprises determining a CHO execution delay upon reception of a HO success message.

13 - 14 . (canceled)

15 . The method of claim 4 , wherein the first network node is a target network node candidate and the second network node is a source network node,
wherein communicating with the second network node to configure the CHO comprises: receiving from the source network node a HO request message comprising an indication that the HO request message is associated with a CHO; and transmitting a HO request acknowledge message to the source network node, and wherein the conditional reconfiguration delay is a preparation delay associated with a time between receiving the HO request message and transmitting the HO request acknowledge message.

16 . (canceled)

17 . The method of claim 4 , wherein the first network node is a target network node candidate and the second network node is a source network node, and
wherein the conditional reconfiguration delay is a CHO validity delay associated with a time duration for which CHO resources in the target network node candidate have been reserved before a CHO execution occurred, the method further comprising either:
performing a HO for the communication device and transmitting a HO success message to the source network node, or
receiving a HO cancel message from the source network node,
wherein determining the CHO validity delay comprises measuring at least one of:
an amount of time between transmitting the HO request acknowledge message and transmitting the HO success message; and
an amount of time between receiving the HO request message and transmitting the HO success message.

18 - 23 . (canceled)

24 . The method of claim 2 , wherein the first network node is a target network node candidate and the second network node is a source network node, and
wherein determining the conditional reconfiguration delay comprises determining a time between receiving a preamble transmission attempt from the communication device and receiving a RRC reconfiguration complete message from the communication device the method further comprising:
performing an admission control procedure based on information derived from the conditional reconfiguration delay; and
transmitting a HO request acknowledge message or a HO reject message based on a result of the admission control procedure.

25 . (canceled)

26 . The method of claim 2 , further comprising:
providing the conditional reconfiguration delay to at least one of: an operation and maintenance, OAM, node; and a self-organizing network, SON, function node.

27 . The method of claim 1 , wherein communicating with the second network node comprises communicating a message with the second network node during configuration of the CHO for the communication device, the message comprising information associated with a conditional reconfiguration delay,
wherein determining the delay comprises determining a timer value associated with the CHO, the method further comprising:
responsive to determining the timer value, transmitting to the communication device a conditional reconfiguration message comprising the timer value,
wherein the first network node is a source network node and the second network node is a target network node candidate, wherein communicating the message with the second network node comprises transmitting a HO request message to the target network node candidate, the HO request message comprising the information associated with the conditional reconfiguration delay, and wherein determining the timer value associated with the CHO comprises receiving a HO request acknowledge message from the target network node candidate, the HO request acknowledge message comprising the timer value.

28 - 31 . (canceled)

32 . The method of claim 1 , wherein communicating with the second network node comprises communicating a message with the second network node during configuration of the CHO for the communication device, the message comprising information associated with a conditional reconfiguration delay,
wherein determining the delay comprises determining a timer value associated with the CHO, the method further comprising:
responsive to determining the timer value, transmitting to the communication device a conditional reconfiguration message comprising the timer value,
wherein the first network node is a target network node candidate and the second network node is a source network node, wherein co

Assignees

• Ericsson Telefon Ab L M

Inventors

• Da Silva Icaro Leonardo
• Falk Lars
• Zhohov Roman

Classifications

• H04W36/362 Primary

  Conditional handover · CPC title

• H04W36/00837

  Determination of triggering parameters for hand-off · CPC title

• H04W36/0016 Primary

  Hand-off preparation specially adapted for end-to-end data sessions · CPC title

• H04W36/0088

  Scheduling hand-off measurements · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title