Carrier information exchange between base stations

1. A method comprising:

a) transmitting, by a first base station, a first message to initiate an association between said first base station and a second base station, said first message comprising a first initiation tag;

b) receiving, by said first base station, a second message from said second base station, said second message comprising:

i) a second verification tag, said second verification tag equal to said first initiation tag;

ii) a second initiation tag;

iii) a first state parameter comprising:

(1) at least one parameter related to operational information of said association; and

(2) a message authentication code generated as a function of a private key;

c) transmitting, by said first base station, at least one third message to said second base station; said at least one third message comprising:

i) a first verification tag, said first verification tag equal to said second initiation tag; and

ii) a parameter comprising said first state parameter;

d) receiving, by said first base station, at least one fourth message from said second base station, said at least one fourth message comprising:

i) an acknowledgement for the receipt of said parameter; and

ii) a second application protocol message, comprising:

(1) a identifier of said second base station, said second base station comprising a plurality of carriers comprising:

(a) at least one backward compatible carrier; and

(b) at least one non-backward compatible carrier, a first common reference signal overhead of each of said at least one non-backward compatible carrier being substantially lower than a second common reference signal overhead of each of said at least one backward compatible carrier;

(2) at least one mobility management entity group identifier;

(3) a cell identifier for each of said at least one backward compatible carrier; and

(4) information identifying a carrier type for each of said plurality of carriers, said carrier type being one of at least a backward compatible type and a non-backward compatible type; and

e) operating, by said first base station, a wireless device handover employing said association and based, at least in part, on information in said at least one fourth message.

2. The method of claim 1 , further comprising selecting, by said first base station, said first initiation tag value employing a pseudo-random process.

3. The method of claim 1 , wherein said first message further comprising a first advertised receiver window credit representing a dedicated buffer space that said first base station reserves for a window of received packets from said second base station.

4. The method of claim 1 , wherein said at least one third message further comprises said first base station transport address and said second base station transport address.

5. The method of claim 1 , wherein said second base station places said first initiation tag in a verification tag of every transport layer packet that said second base station transmits to said first base station within said association.

6. The method of claim 1 , wherein said first state parameter further comprises:

a) a timestamp on when said first state parameter is created; and

b) a lifespan of the first state parameter.

7. The method of claim 1 , wherein said message authentication code is a function of at least one parameter related to said operational information.

8. The method of claim 1 , wherein said operational information comprises at least one of the following:

a) a parameter in said first message;

b) a parameter in said second message;

c) a state of said association;

d) a configuration parameter of said first base station; and

e) a configuration parameter of said second base station.

9. The method of claim 1 , wherein said second application protocol message further comprises:

a) a cell identifier for each of said at least one non-backward compatible carrier; and

b) information identifying a corresponding backward compatible carrier for each of said at least one non-backward compatible carrier.

10. The method of claim 1 , further comprising, transmitting by said first base station a second common reference signal on a pre-configured OFDM resource region of said at least one non-backward compatible carrier.

11. The method of claim 1 , wherein said second application protocol message further comprises a cell identifier for each of said at least one non-backward compatible carrier.

12. A method comprising:

a) receiving, by a first base station, a second application protocol message from a second base station, said second application protocol message comprising:

i) a identifier of said second base station, said second base station comprising a plurality of carriers comprising:

(1) at least one backward compatible carrier; and

(2) at least one non-backward compatible carrier, a first common reference signal overhead of each of said at least one non-backward compatible carrier being substantially lower than a second common reference signal overhead of each of said at least one backward compatible carrier;

ii) at least one mobility management entity group identifier;

iii) a cell identifier for each of said at least one backward compatible carrier; and

iv) information identifying a carrier type for each of said plurality of carriers, said carrier type being one of at least a backward compatible type and a non-backward compatible type; and

b) operating, by said first base station, a wireless device handover based, at least in part, on information in said second application protocol message.

13. The method of claim 12 , wherein said second application protocol message further comprises a cell identifier for each of said at least one non-backward compatible carrier.

14. The method of claim 12 , further comprising broadcasting on said at least one backward compatible carrier, by said first base station, a common cell reference signal, while no common reference signal is transmitted on said at least one non-backward compatible carrier.

15. The method of claim 12 , further comprising, transmitting by said first base station a second common reference signal in a pre-configured subset of the subframes on said at least one non-backward compatible carrier.

16. The method of claim 12 , further comprising, transmitting by said first base station a second common reference signal on a pre-configured OFDM resource region of said at least one non-backward compatible carrier.

17. A first base station comprising:

a) one or more communication interfaces;

b) one or more processors; and

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

i) receive a second application protocol message from a second base station, said second application protocol message comprising:

(1) a identifier of said second base station, said second base station comprising a plurality of carriers comprising:

(a) at least one backward compatible carrier; and

(b) at least one non-backward compatible carrier, a first common reference signal overhead of each of said at least one non-backward compatible carrier being substantially lower than a second common reference signal overhead of each of said at least one backward compatible carrier;

(2) at least one mobility management entity group identifier;

(3) a cell identifier for each of said at least one backward compatible carrier; and

(4) information identifying a carrier type for each of said plurality of carriers, said carrier type being one of a backward compatible type and a non-backward compatible type; and

ii) operate a wireless device handover based, at least in part, on information in said second application protocol message.

18. The first base station of claim 17 , wherein said second application protocol message further comprises:

a) a cell identifier for each of said at least one non-backward compatible carrier; and

b) information identifying a corresponding backward compatible carrier for each of said at least one non-backward compatible carrier.

19. The first base station of claim 17 , wherein said instructions, when executed, further cause said first base station to transmit 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.

20. The first base station of claim 17 , wherein said instructions, when executed, further cause said first base station to transmit a demodulation reference signal on:

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

b) said at least one backward compatible carrier.