Beamforming handover messaging in a wireless network

1. A method comprising:

a) transmitting, by a serving base station, in response to said serving base station making a handover decision for a wireless device, at least one first message to at least one target base station, said at least one first message comprising:

i) one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of:

(1) a maximum of k channel state information reference signals for a carrier, k being an integer greater than one; and

(2) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one; and

ii) configuration parameters of:

(1) j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and

(2) m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n;

b) receiving, by said serving base station, at least one second message from one of said at least one target base station, said at least one second message comprising configuration parameters of:

i) p channel state information reference signals for said carrier, p being an integer smaller than or equal to k; and

ii) q channel state information interference measurement resources for said carrier, q being an integer smaller than or equal to n; and

c) transmitting, by said serving base station, in response to receiving said at least one second message, a third message to said wireless device, said third message comprising said configuration parameters of:

i) said p channel state information reference signals; and

ii) said q channel state information interference measurement resources.

2. The method of claim 1 , before said third message is transmitted, further comprising:

a) encrypting said third message; and

b) protecting said third message by an integrity header.

3. The method of claim 1 , wherein said third message:

a) further includes configuration information for physical channels for said wireless device; and

b) is configured to cause said wireless device to set up or modify at least one radio bearer.

4. The method of claim 1 , wherein said third message is configured to cause said wireless device to configure at least one of a physical layer parameter, a media access control layer parameter and an radio link control layer parameter.

5. The method of claim 1 , wherein said third message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.

6. The method of claim 1 , wherein said third message comprises at least one radio resource configuration parameter comprising at least one physical channel configuration parameter.

7. The method of claim 1 , further comprising said one of said at least one target base station transmitting a plurality of channel state information reference signals on said carrier.

8. The method of claim 1 , further comprising said one of said at least one target base station transmitting a plurality of a demodulation reference signals on said carrier.

9. The method of claim 1 , said third message further comprising configuration parameters of a plurality of carriers.

10. A serving base station comprising:

a) one or more communication interfaces;

b) one or more processors; and

c) memory storing instructions that, when executed, cause said serving base station to:

i) transmit in response to said serving base station making a handover decision for a wireless device, at least one first message to at least one target base station, said at least one first message comprising at least one of:

(1) one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of:

(a) a maximum of k channel state information reference signals for a carrier, k being an integer greater than one; and

(b) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one; and

(2) configuration parameters of:

(a) j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and

(b) m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n;

ii) receive at least one second message from one of said at least one target base station, said at least one second message comprising configuration parameters of:

(1) p channel state information reference signals for said carrier, p being an integer smaller than or equal to k; and

(2) q channel state information interference measurement resources for said carrier, q being an integer smaller than or equal to n; and

iii) transmit in response to receiving said at least one second message, a third message to said wireless device, said third message comprising said configuration parameters of:

(1) said p channel state information reference signals; and

(2) said q channel state information interference measurement resources.

11. The serving base station of claim 10 , wherein said instructions, when executed, further causes said serving base station, before said third message is transmitted, to:

a) encrypt said third message; and

b) protect said third message by an integrity header.

12. The serving base station of claim 10 , wherein said third message:

a) further includes configuration information for physical channels for said wireless device; and

b) is configured to cause said wireless device to set up or modify at least one radio bearer.

13. The serving base station of claim 10 , wherein said third message causes said wireless device to configure at least one of a physical layer parameter, a media access control layer parameter and an radio link control layer parameter.

14. The serving base station of claim 10 , wherein said third message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.

15. The serving base station of claim 10 , wherein said third message comprises radio resource configuration parameters comprising one or more physical channel configuration parameters.

16. A cellular network comprising:

a) a serving base station configured to communicate with at least one target base station; and

b) said at least one target base station; and

wherein:

i) said serving base station transmits in response to making a handover decision for a wireless device, at least one first message to said at least one target base station, said at least one first message comprising at least one of:

(1) one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of:

(a) a maximum of k channel state information reference signals for a carrier, k being an integer greater than one; and

(b) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one; and

(2) configuration parameters of:

(a) j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and

(b) m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n;

ii) said serving base station receives at least one second message from one of said at least one target base station, said at least one second message comprising configuration parameters of:

(1) p channel state information reference signals for said carrier, p being an integer smaller than or equal to k; and

(2) q channel state information interference measurement resources for said carrier, q being an integer smaller than or equal to n; and

iii) said serving base transmits in response to receiving said at least one second message, a third message to said wireless device, said third message comprising said configuration parameters of:

(1) said p channel state information reference signals; and

(2) said q channel state information interference measurement resources.

17. The cellular network of claim 16 , wherein said third message comprises radio resource configuration parameters comprising one or more physical channel configuration parameters.

18. The cellular network of claim 16 , wherein said one of said at least one target base station transmits a channel state information reference signal on:

a) said at least one non-backward compatible carrier; and

b) said at least one backward compatible carrier.

19. The cellular network of claim 16 , wherein said one of said at least one target base station transmits a demodulation reference signal on:

a) said at least one non-backward compatible carrier; and

b) said at least one backward compatible carrier.

20. The cellular network of claim 16 , wherein said third message further comprises:

a) said information identifying a carrier type for each of said plurality of carriers; and

b) said information associating each of said non-backward compatible carrier in said plurality of carriers with one backward compatible carrier in said plurality of carriers.