Handover signaling in wireless networks
View Patent ↗A first base station transmits at least one message to configure at least one backward compatible carrier and at least one non-backward compatible carrier in a wireless device. The first base station transmits, in response to the first base station making a handover decision, a second message to a second base station. The second message comprises parameters indicating whether the wireless device supports configuration of non-backward compatible carriers, configuration information of at least one backward compatible carrier and/or configuration information of at least one non-backward compatible carrier.
1. A base station comprising:
one or more processors; and
memory storing instructions that, when executed, cause the base station to:
receive, from a wireless device via a primary carrier of at least one backward compatible carrier, a first message comprising one or more parameters indicating whether the wireless device supports at least one non-backward compatible carrier;
transmit, if the one or more parameters indicate support of the at least one non-backward compatible carrier, at least one second message comprising configuration parameters comprising an identifier for each carrier in a plurality of carriers, the plurality of carriers comprising:
one or more of the at least one backward compatible carrier; and
one or more of the at least one non-backward compatible carrier;
receive at least one measurement report from the wireless device;
make a handover decision for the wireless device; and
transmit to a second base station, in response to the handover decision, a third message comprising at least one of:
the one or more parameters indicating whether the wireless device supports configuration of the at least one non-backward compatible carrier; and
configuration information of the one or more of the at least one non-backward compatible carrier.
2. The base station of claim 1 , wherein the at least one second message is an encrypted message and the at least one second message comprises an integrity header.
3. The base station of claim 1 , wherein the at least one second message further comprises:
configuration information for physical channels for the wireless device; and
configuration information for setting up or modifying at least one radio bearer.
4. The base station of claim 1 , wherein one of the at least one second message comprises at least one of a physical layer parameter, a media access control (MAC) layer parameter, and a radio link control (RLC) layer parameter.
5. The base station of claim 1 , wherein one of the at least one second message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.
6. The base station of claim 1 , wherein one of the at least one second message comprises radio resource configuration parameters comprising physical channel configuration parameters.
7. The base station of claim 1 , wherein the instructions, when executed, further cause the base station to transmit a channel state information reference signal via:
the at least one non-backward compatible carrier; and
the at least one backward compatible carrier.
8. The base station of claim 1 , wherein the instructions, when executed, further cause the base station to transmit a demodulation reference signal via:
the at least one non-backward compatible carrier; and
the at least one backward compatible carrier.
9. A method for use in a base station, the method comprising:
receiving, from a wireless device via a primary carrier of at least one backward compatible carrier, a first message comprising one or more parameters indicating whether the wireless device supports at least one non-backward compatible carrier;
transmitting, if the one or more parameters indicate support of the at least one non-backward compatible carrier, at least one second message comprising configuration parameters comprising an identifier for each carrier in a plurality of carriers, the plurality of carriers comprising:
one or more of the at least one backward compatible carrier; and
one or more of the at least one non-backward compatible carrier;
receiving at least one measurement report from the wireless device;
making a handover decision for the wireless device; and
transmitting to a second base station, in response to the handover decision, a third message comprising at least one of:
the one or more parameters indicating whether the wireless device supports configuration of the at least one non-backward compatible carrier; and
configuration information of the one or more of the at least one non-backward compatible carrier.
10. The method of claim 9 , wherein the at least one second message is an encrypted message and the second message comprises an integrity header.
11. The method of claim 9 , wherein the at least one second message further comprises:
configuration information for physical channels for the wireless device; and
configuration information for setting up or modifying at least one radio bearer.
12. The method of claim 9 , wherein one of the at least one second message comprises at least one of a physical layer parameter, a media access control (MAC) layer parameter, and a radio link control (RLC) layer parameter.
13. The method of claim 9 , wherein one of the at least one second message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.
14. The method of claim 9 , wherein one of the at least one second message comprises radio resource configuration parameters comprising physical channel configuration parameters.
15. The method of claim 9 , further comprising transmitting a channel state information reference signal via:
the at least one non-backward compatible carrier; and
the at least one backward compatible carrier.
16. The method of claim 9 , further comprising transmitting a demodulation reference signal via:
the at least one non-backward compatible carrier; and
the at least one backward compatible carrier.
17. A method for use in a network comprising a first base station and a second base station, the method comprising:
receiving by the first base station from a wireless device via a primary carrier of at least one backward compatible carrier, a first message comprising one or more parameters indicating whether the wireless device supports at least one non-backward compatible carrier;
transmitting by the first base station to the wireless device, if the one or more parameters indicate support of the at least one non-backward compatible carrier, at least one second message comprising configuration parameters comprising an identifier for each carrier in a plurality of carriers, the plurality of carriers comprising:
one or more of the at least one backward compatible carrier; and
one or more of the at least one non-backward compatible carrier;
receive, by the first base station, at least one measurement report from the wireless device;
making, by the first base station, a handover decision for the wireless device; and
transmitting, by the first base station to the second base station, in response to the handover decision, a third message comprising at least one of:
the one or more parameters indicating whether the wireless device supports configuration of the at least one non-backward compatible carrier; and
configuration information of the one or more of the at least one non-backward compatible carrier.
18. The method of claim 17 , further comprising transmitting by the first base station a channel state information reference signal via:
the at least one non-backward compatible carrier; and
the at least one backward compatible carrier.
19. The method of claim 17 , further comprising transmitting by the first base station a demodulation reference signal via:
the at least one non-backward compatible carrier; and
the at least one backward compatible carrier.
20. The method of claim 17 , wherein one of the at least one second message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.