Handling location information for femto cells

• US 20100240397A1
• Filed: 05/28/2008
• Published: 09/23/2010
• Est. Priority Date: 10/29/2007
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Vikberg, Jari, Nylander, Tomas, Buchmayer, Mats, Hedberg, Tomas
• Granted Patent: US 8,509,778 B2
• Time in Patent Office: Days
• US Class Current: 455/456.100
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04L 63/101 Access control lists [ACL]
• CPC Class Codes: H04W 12/084 using delegated authorisation, e.g. open authorisation [OAuth] protocol
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0251 using monitoring of local events, e.g. events related to user activity
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 64/003 locating network equipment
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention relates to methods and arrangements for configuring the HeNB (Home eNode B) to retrieve location information indicative of its location and sending this location information via a core network node to a UE (User Equipment) authorized to access the HeNB. The UE can then based on this received location information and on a determination of the location of the UE determine whether the UE is being positioned in the coverage of the HeNB. This implies that the authorized UEs of the HeNB know when they should try to find and access the HeNB and the UEs may then avoid accessing the HeNB when it is out of the HeNB coverage which will save UE battery and reduce interference.

Claims

1. A method for a Home eNode B, HeNB, of a mobile telecommunication network, wherein the HeNB is connectable to a core network of the mobile telecommunication network and is adapted to serve at least one femto cell and the HeNB is further connectable to a set of user equipment, UEs, being authorized to connect to the HeNB, the method comprises the steps of:

retrieving Femto Cell Location Information indicative of a location of the HeNB;

sending the retrieved Femto Cell Location Information to the core network node for forwarding the retrieved Femto Cell Location Information to a UE authorized to connect to said HeNB, such that the UE can determine whether the UE is within or close to the coverage of the HeNB.

2. The method according to claim 1, wherein the Femto Cell Location Information comprises information of surrounding macro cells to the HeNB.

3. The method according to claim 2, wherein the Femto Cell Location Information is obtained by a UE receiver implemented in the HeNB by listening to system information of adjacent cells.

4. The method according to claim 1, wherein the Femto Cell Location Information comprises information of geographic coordinates of the HeNB.

5. The method according to claim 1, wherein the Femto Cell Location Information is obtained by a GPS device or receiver.

6. The method according to claim 1, comprising the further step of:

receiving information, from the core network, that the HeNB should be switched off; and

switching off the HeNB.

7. The method according to claim 1, comprising the further step of:

receiving information from the core network that the HeNB should be switched on; and

switching on the HeNB if the HeNB currently is switched off.

8. A method for a user equipment, UE, authorized to be connected to a Home eNode B, HeNB, of a mobile telecommunication, wherein the HeNB serves at least one femto cell, the method comprises the steps of:

receiving Femto Cell Location Information indicative of a location of the HeNB;

determining the location of the UE;

determining whether the location of the UE is within a range in relation to the location of the HeNB; and

performing an access attempt if it is determined that the location of the UE is within a range in relation to the location of the HeNB.

9. The method according to claim 8, the method comprises the further steps of:

sending a message to the HeNB via a currently connected eNode B and a core network to switch on the HeNB; and

then

performing an access attempt if it is determined that the location of the UE is within a range in relation to the location of the HeNB.

10. The method according to claim 8, wherein it comprises the further step of:

sending a message to the HeNB via a currently connected eNode B and a core network to switch off the HeNB, if it is determined that the location of the UE is not within a range in relation to the location of the HeNB.

11. The method according to claim 8, wherein the location information indicates surrounding macro cells of the HeNB, and the step of determining whether the location of the UE is within a range in relation to the location of the HeNB, the method comprises the further steps of:

listening to broadcasted system information to obtain knowledge of surrounding cells;

comparing the obtained knowledge of surrounding cells with the information of surrounding cells comprised in the received location information; and

determining that the location of the UE is within a range in relation to the location of the HeNB based on said comparison.

12. The method according to claim 8, wherein the location information indicates geographical coordinates of the HeNB, and the step of determining whether the location of the UE is within a range in relation to the location of the HeNB comprises the further steps of:

using a GPS receiver or device to determine the geographical coordinates of the UE;

comparing the geographical coordinates of the UE with the geographical coordinates of the HeNB; and

determining that the location of the UE is within a range in relation to the location of the HeNB based on said comparison.

13. A method for a core network node connectable to a Home eNode B, HeNB, and to at least one User Equipment, UE, via a radio base station, wherein the UE is authorized to access the HeNB, the method comprises the steps of:

receiving Femto Cell Location Information indicative of a location of the HeNB; and

forwarding the received Femto Cell Location Information to the at least one UE via the radio base station such that the UE can determine whether the UE is within the coverage of the HeNB.

14. The method according to claim 13, wherein the Femto Cell Location Information further comprises identities of the UEs having access to the HeNB, to be used in the forwarding step.

15. The method according to claim 13, wherein the Femto Cell Location Information comprises the identity of the HeNB and identities of the UEs having access to the HeNB are retrieved from a database based on the identity of the HeNB, to be used in the forwarding step.

16. The method according to claim 13, comprises the steps of:

receiving information from a UE that a HeNB that the UE is authorized to connect to should be switched off or switched on; and

forwarding the received information to the HeNB that the HeNB should be switched on or switched off.

17. A Home eNode B, HeNB, of a mobile telecommunication network, wherein the HeNB is connectable to a core network of the mobile telecommunication network and is adapted to serve at least one femto cell and the HeNB is further connectable to a set of user equipments, UEs, being authorized to connect to the HeNB, the HeNB comprises means for retrieving Femto Cell Location Information indicative of a location of the HeNB, a transmitter for sending the retrieved Femto Cell Location Information to the core network node for forwarding the retrieved Femto Cell Location Information to a UE authorized to connect to said HeNB, such that the UE can determine whether the UE is within or close to the coverage of the HeNB.

18. The HeNB according to claim 17, wherein the Femto Cell Location Information comprises information of surrounding macro cells to the HeNB.

19. The HeNB according to claim 18, wherein the means for retrieving the Femto Cell Location Information is a UE receiver implemented in the HeNB adapted to listen to system information of adjacent cells.

20. The HeNB according to claim 17, wherein the Femto Cell Location Information comprises information of geographic coordinates of the HeNB.

21. The HeNB according to claim 20, wherein the means for retrieving the Femto Cell Location Information is a GPS device or receiver.

22. The HeNB according to claim 17, wherein the HeNB further comprises means for receiving information from the core network that the HeNB should be switched off, and means for switching off the HeNB.

23. The HeNB according to claim 17, wherein the HeNB comprises means for receiving information from the core network that the HeNB should be switched on, and means for switching on the HeNB if the HeNB currently is switched off.

24. A user equipment, UE, authorized to be connected to a Home eNode B, HeNB, of a mobile telecommunication, wherein the HeNB serves at least one femto cell, the UE comprises means for receiving Femto Cell Location Information indicative of a location of the HeNB, means for determining (272) the location of the UE, means for determining whether the location of the UE is within a range in relation to the location of the HeNB, and means for performing an access attempt.

25. The UE according to claim 24, wherein the UE comprises a transmitter for sending a message to the HeNB via a currently connected eNode B and a core network to switch on the HeNB, and means for performing an access attempt.

26. The UE according to claim 24, wherein the UE comprises a transmitter for sending a message to the HeNB via a currently connected eNode B and a core network to switch off the HeNB.

27. The UE according to claim 25, wherein the location information indicates surrounding macro cells of the HeNB, and the means for determining whether the location of the UE is within a range in relation to the location of the HeNB comprises means for listening to broadcasted system information to obtain knowledge of surrounding macro cells, means for comparing the obtained knowledge of surrounding macro cells with the information of surrounding macro cells comprised in the received location information, and means for determining that the location of the UE is within a range in relation to the location of the HeNB based on said comparison.

28. The UE according to claim 25, wherein the location information indicates geographical coordinates of the HeNB, and the means for determining whether the location of the UE is within a range in relation to the location of the HeNB comprises the means for using a GPS device/receiver to determine the geographical coordinates of the UE, means for comparing the geographical coordinates of the UE with the geographical coordinates of the HeNB, and means for determining that the location of the UE is within a range in relation to the location of the HeNB based on said comparison.

29. A core network node connectable to a Home eNode B, HeNB, and to at least one UE via a radio base station, wherein the UE is authorized to access the HeNB, the core network comprises means for receiving Femto Cell Location Information indicative of a location of the HeNB and means for forwarding the received Femto Cell Location Information to the at least one UE via the radio base station such that the UE can determine whether the UE is within the coverage of the HeNB.

30. The core network node according to claim 29, wherein the Femto Cell Location Information further comprises identities of the UEs having access to the HeNB, to be used in the forwarding step.

31. The core network node according to claim 29, wherein the Femto Cell Location Information comprises the identity of the HeNB and identities of the UEs having access to the HeNB are retrieved from a database based on the identity of the HeNB, to be used in the forwarding step.

32. The core network node according to claim 29, wherein the core network comprises means for receiving information from a UE that a HeNB that the UE is authorized to connect to should be switched off or switched on, and means for forwarding the received information to the HeNB that the HeNB should be switched off or switched on.