Handover event prioritization

Patent metadata

Field	Value
Publication number	US-9907005-B2
Application number	US-201114125402-A
Country	US
Kind code	B2
Filing date	Jun 15, 2011
Priority date	Jun 15, 2011
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

To communicate wireless handover events, a communications device associated with a serving cell of a cellular network determines, based on at least one or more first measurement results indicative of cell quality parameters of a plurality of cells of the cellular network, a first handover event associated with a first one of the cells, initiates communication of a first handover message indicative of the determined first handover event to a network entity of the cellular network, and, based on at least one or more second measurement results, determines a plurality of further handover events associated with respective ones of the cells, resulting in a plurality of pending handover events waiting to be communicated to a network entity of the cellular network. The communications device also determines a priority order for at least a subset of the pending handover events. The subset includes handover events associated with different cells.

First claim

The invention claimed is:

1. A method, implemented by a communications device, for communicating wireless handover events, the communications device being associated with at least one serving cell of a cellular communications network, the method comprising: determining, based on at least one or more first measurement results indicative of one or more cell quality parameters of respective ones of a first plurality of cells of the cellular communications network, a first handover event associated with a first one of the first plurality of cells; initiating communication of a first handover message indicative of the determined first handover event to a network entity of the cellular network; determining, based on at least one or more second measurement results indicative of one or more cell quality parameters of respective ones of a second plurality of cells of the cellular communications network, a plurality of further handover events associated with respective ones of the second plurality of cells, resulting in a plurality of pending handover events waiting to be communicated to the network entity of the cellular network; determining a priority order for at least a subset of the pending handover events, wherein the subset comprises handover events from the first handover event associated with the first one of the first plurality of cells and the plurality of further handover events associated with respective ones of the second plurality of cells; wherein the determining the priority order comprises determining estimated validity periods of at least one of the measurement results used as a basis for each of the subset of pending handover events; wherein the determining the priority order is based on the determined estimated validity periods and at least one of: a signal strength; a rate of occurrence of handover events; a determined speed with which the communications device moves relative to the cellular network; a signal-to-interference ratio of the cells associated with the respective pending handover events; selecting, based on the priority order, a handover event from the first handover event and the pending handover events; and communicating a second handover message indicative of the selected handover event.

2. The method of claim 1 : wherein each pending handover event has an associated event time; wherein the determining the priority order comprises determining the priority order based on at least the event times of the respective pending wireless communication handover events.

3. The method of claim 1 , further comprising communicating, to the network entity of the cellular network, a second handover event selected from the subset of pending handover events, the second handover event having a highest priority according to the determined priority order.

4. The method of claim 1 , wherein the cell quality parameter is one of the signal strength and the signal-to-interference ratio.

5. The method of claim 1 , wherein the determining the priority order comprises determining the priority order based on the determined speed with which the communications device moves relative to the cellular network and on the rate of occurrence of handover events.

6. The method of claim 1 : wherein the initiating communication of a handover message comprises communicating an initial request to communicate a message; wherein the determining the priority order comprises determining the priority order for the first handover event and for at least a subset of the pending handover events; wherein the method further comprises: receiving a response to the initial request; selecting, based on the priority order, a handover event from the first and the pending handover events; and communicating a handover message indicative of the selected handover event.

7. The method of claim 1 : further comprising determining, from at least the second measurement results and based on at least one predetermined selection criterion, one or more likely handover events, the selection criterion being indicative of a likelihood of a handover event being triggered within a predetermined period of time; wherein determining the priority order comprises determining the priority order for the determined likely handover events and for at least a subset of the pending handover events.

8. The method of claim 7 , wherein the predetermined selection criterion comprises the second measurement results having exceeded a first threshold smaller than a second threshold required for determining a handover event.

9. The method of claim 1 , further comprising: determining at least one parameter indicative of an estimated validity period of handover events; selectively performing the determination of the priority order responsive to the determined at least one parameter.

10. The method of claim 1 , wherein: each pending handover event has an associated event type; the determining the priority order is based on at least the event types of the respective pending wireless communication handover events.

11. The method of claim 1 , wherein each cell of the cellular communications network has an associated cell identifier allowing the communications device to distinguish different cells of the cellular communications network.

12. The method of claim 1 , wherein at least one of the second measurement results is included in the first measurement results.

13. The method of claim 1 , wherein at least one of the first plurality of cells is included in the second plurality of cells.

14. The method of claim 1 , further comprising: determining one or more likely handover events based on a predetermined selection criterion: indicating a likelihood of a handover event being triggered within a predetermined period of time; and comprising the second measurement results having exceeded a first threshold smaller than a second threshold required for determining a handover event; determining at least one parameter indicative of an estimated validity period of handover events; selectively performing the determination of the priority order responsive to the determined at least one parameter; wherein the determining of the priority order: is based on the determined speed with which the communications device moves relative to the cellular network and on the rate of occurrence of handover events; and comprises determining the priority order for the determined likely handover events and for at least a subset of the pending handover events.

15. The method of claim 1 , further comprising: determining one or more likely handover events based on a predetermined selection criterion: indicating a likelihood of a handover event being triggered within a predetermined period of time; and comprising the second measurement results having exceeded a first threshold smaller than a second threshold required for determining a handover event; wherein each pending handover event has an associated event type; wherein the determining of the priority order is based on: the determined speed with which the communications device moves relative to the cellular network; the rate of occurrence of handover events; and the event types of the respective pending wireless communication handover events; wherein the determining of the priority order comprises determining the priority order for the determined likely handover events and for at least a subset of the pending handover events.

16. A communications device, comprising: a measurement circuit configured to obtain a plurality of measurement results indicative of one or more cell quality parameters of respective first plurality of cells of a cellular communications network; a control circuit c

Assignees

• Lindoff Bengt
• Moren Lennart
• Wallen Anders
• Ericsson Telefon Ab L M

Inventors

• Lindoff Bengt
• Moren Lennart
• Wallen Anders

Classifications

• H04W36/24 Primary

  Reselection being triggered by specific parameters · CPC title

• H04W36/0083

  Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists · CPC title

• H04W36/30

  by measured or perceived connection quality data · CPC title

• H04W36/304

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

• H04W36/0085 Primary

  Hand-off measurements · CPC title