Mobile terminal and hand-over solving method

• US 20040185851A1
• Filed: 03/18/2004
• Published: 09/23/2004
• Est. Priority Date: 03/19/2003
• Status: Active Grant

• Current Assignee: Warren & Lewis Investment Corporation
• Original Assignee: NEC Corporation
• Inventors: Nagai, Hiroto
• Granted Patent: US 7,079,842 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/008375 based on historical data
• CPC Class Codes: H04W 52/0258 controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Information about a past channel connection history accompanying movements of a user is stored in a mobile phone. When a channel is connected with a new base station by turning the power on or by a hand-over, the information about a channel connection history is searched, then one or more cell to which the user may move is predicted, and to those cells, a determination of a hand-over is performed preferentially. Thereby, an increase in power consumption of the mobile terminal is prevented.

Claims

1. A mobile terminal comprising:

a processor for determining whether a hand-over request, for continuing communications by switching a base station when a user moves from one cell to another, is required; and

a memory for storing a hand-over history performed by the processor;

wherein

based on history data of hand-over read out from the memory, the processor predicts a base station to which the user may move as a base station for performing a hand-over.

2. The mobile terminal, as claimed in claim 1, wherein the processor causes the memory to store information about hand-over including a number of hand-over being performed and a latest update time for each base station.

3. The mobile terminal, as claimed in claim 2, wherein the processor preferentially predicts a base station, in which the number of hand-over being performed is large, as a base station for performing a hand-over.

4. The mobile terminal, as claimed in claim 2, wherein the processor preferentially predicts a base station, in which the number of hand-over being performed is larger than a threshold, as a base station for performing a hand-over.

5. The mobile terminal, as claimed in claim 1, wherein by updating the history data of hand-over using an LRU algorithm, the processor causes the memory to store the history data.

6. The mobile terminal, as claimed in claim 1, wherein when a communicating condition with a base station predicted as a target of a hand-over deteriorates, the processor monitors communicating conditions with base stations adjacent to a source base station to thereby select a base station to which a hand-over is performed.

7. The mobile terminal, as claimed in claim 6, wherein the processor determines the deterioration in the communicating condition based on a change in a strength of receiving electric power from the base station.

8. The mobile terminal, as claimed in claim 6, wherein the processor determines the deterioration in the communicating condition based on a change in a signal interference wave output ratio from the base station.

9. The mobile terminal, as claimed in claim 6, wherein the processor determines the deterioration in the communicating condition based on a change in a BER from the base station.

10. A hand-over solving method for a mobile terminal comprising:

a first step of storing history data of hand-over performed to continue communications by switching a base station when a user moves from one cell to another; and

a second step of predicting, based on the history data of hand-over, a base station to which the user may move as a base station requiring a hand-over request.

11. The hand-over solving method for a mobile terminal, as claimed in claim 10, wherein the history data includes hand-over information including a number of hand-over being performed and a latest update time for each base station.

12. The hand-over solving method for a mobile terminal, as claimed in claim 11, further comprising a step of preferentially predicting a base station, in which the number of hand-over being performed is large, as a base station for performing a hand-over.

13. The hand-over solving method for a mobile terminal, as claimed in claim 11, further comprising a step of preferentially predicting a base station, in which the number of hand-over being performed is larger than a threshold, as a base station for performing a hand-over.

14. The hand-over solving method for a mobile terminal, as claimed in claim 10, further comprising a step of, by updating the history data of hand-over using an LRU algorithm, causing the history data to be stored.

15. The hand-over solving method for a mobile terminal, as claimed in claim 10, further comprising a step of, when a communicating condition with a base station predicted as a target of a hand-over deteriorates, monitoring communicating conditions with base stations adjacent to a source base station to thereby select a base station to which a hand-over is performed.

16. The hand-over solving method for a mobile terminal, as claimed in claim 15, wherein the deterioration in the communicating condition is determined based on a change in a strength of receiving electric power from the base station.

17. The hand-over solving method for a mobile terminal, as claimed in claim 15, wherein the deterioration in the communicating condition is determined based on a change in a signal interference wave output ratio from the base station.

18. The hand-over solving method for a mobile terminal, as claimed in claim 15, wherein the deterioration in the communicating condition is determined based on a change in a BER from the base station.