Method and arrangement in a telecommunication system

1. A method for a user equipment unit in a cellular radio communication network, said method comprising:

selecting a paging position within a network bandwidth, wherein the user equipment receives paging indications from the network according to the paging position, the user equipment is operating using a reception bandwidth that is smaller than the network bandwidth, and the user equipment is monitoring for the paging indication while operating in at least one of idle mode or another low activity state; and

changing the paging position to a second paging position based on an explicit indication sent by the network, the explicit indication being sent using a dedicated signaling message sent to the user equipment from the network.

2. The method according to claim 1 , wherein the user equipment selects the paging position using one or more predefined rules.

3. The method according to claim 2 , wherein the user equipment selects the paging position according to a rule related to predefined probabilities for each position.

4. The method according to claim 2 , wherein the user equipment selects the paging position according to a rule related to a hash function.

5. The method according to claim 4 , wherein the changing includes hashing an identity of the user equipment onto another paging position that is different from the selected paging position and that is available according to the hash function.

6. The method according to claim 4 , wherein identities of plural user equipments including the user equipment are hashed onto a paging group and are assigned to different paging positions.

7. The method according to claim 1 , wherein the user equipment selects the paging position according to received broadcast information.

8. The method according to claim 1 , wherein the dedicated signaling message comprises one or more of a tracking area update confirm message or a cell update confirm message.

9. The method according to claim 1 , wherein the user equipment selects the paging position according well-defined positions that are associations between user equipment identities and paging positions.

10. The method according to claim 1 , further comprising reporting the selected paging position to the network during a location management after an initial cell selection.

11. The method according to claim 1 , further comprising reporting the selected paging position to the network during a location management after a cell re-selection.

12. The method according to claim 1 , further comprising:

receiving the paging indication labeled according to an identity of the user equipment, from the network according to the paging position; and

changing a state of the user equipment from the idle mode or the low activity state in response to the receiving.

13. A method for paging transmission, for use in a network unit of a cellular radio communication network comprising one or several user equipments operating with a bandwidth that is smaller than the network bandwidth, said method comprising:

transmitting, to a user equipment, a paging indication according to a paging position selected by the user equipment that is within the network bandwidth, the paging indication being sent while the user equipment is in idle mode or another low activity state; and

transmitting, to the user equipment, a dedicated signaling message that explicitly indicates a change to a second paging position to be used by the user equipment for subsequent paging indications.

14. The method of claim 13 , further comprising:

receiving the paging position from the user equipment.

15. The method of claim 13 , further comprising:

transmitting a paging message to the user equipment within the same reception bandwidth used for transmitting the paging indication.

16. The method according to claim 13 , further comprising

broadcasting selection probabilities to achieve a random distribution of the user equipments among different possible paging positions.

17. The method according to claim 13 , further comprising:

periodically requesting the user equipment to retune the paging position.

18. A user equipment for use in a cellular radio communication network, the user equipment being configured to:

select a paging position within the network bandwidth, wherein the user equipment is configured to receive a paging indication from the network according to the paging position, the user equipment is configured to operate using a reception bandwidth that is smaller than the network bandwidth, and the user equipment is configured to monitor for the paging indication while operating in at least one of idle mode or another low activity state; and

change the paging position of the user equipment to a second paging position based on an explicit indication sent by the network, the explicit indication being sent using a dedicated signaling message sent to the user equipment from the network.

19. A network unit, for use in a cellular radio communication network comprising one or more user equipments operating with a bandwidth that is smaller than a network bandwidth, said network unit being configured to:

transmit a paging indication to a user equipment at a paging position selected by the user equipment that is within the network bandwidth, the paging indication being sent while the user equipment is in idle mode or another low activity state; and

transmit, to the user equipment, a dedicated signaling message that explicitly indicates a change to a second paging position to be used by the user equipment for subsequent paging indications.