Adaptation of dual connectivity procedures
The embodiments disclosed herein relates to a wireless communication device, network nodes and methods therein for handling multiple connectivity. A method in a network node comprises determining the extent to which a wireless communication device requires different signals received from different non-co-located radio network points to be synchronized in order to operate with multiple connectivity. The method further comprises deciding whether to configure the WCD to operate with multiple connectivity, based on said determination.
1. A method in a wireless communication device (WCD), the method comprising:
determining a receive timing difference between signals received at the WCD from a candidate cell and a reference cell;
comparing the receive timing difference with a threshold;
reporting information to a network node about one or more cells whose determined receive timing difference are within the threshold;
receiving, in response to the information, a first configuration from the network node to adapt radio operations at the WCD; and
adapting a radio operation at the WCD based on the configuration.
2. The method of claim 1 , wherein the information reported to the network node comprises a cell identifier identifying the one or more cells whose determined receive timing difference are within the threshold.
3. The method of claim 1 , wherein the reference cell is a serving cell or a strongest cell as measured by the WCD or a cell with the shortest propagation delay as measured by the WCD.
4. The method of claim 1 , wherein the threshold is based on a WCD capability, the WCD capability indicating the extent to which the WCD requires different signals received from different cells to be synchronized in order to operate with the different cells.
5. The method of claim 4 , where the WCD capability is based on the number of transmitters, the number of receivers supported by the WCD, or both.
6. The method of claim 1 , further comprising triggering the reporting of the information to the network node autonomously or in response to a request from the network.
7. A wireless communication device (WCD) operable in a communication network supporting multiple connectivity, the wireless communication device comprising:
a communication interface; and
processing circuitry operatively connected to the communication interface and configured to:
determine a receive timing difference between signals received at the WCD from a candidate cell and a reference cell;
compare the receive timing difference with a threshold;
report information to a network node, via the communication interface, about one or more cells whose determined receive timing difference are within the threshold;
receive, in response to the information, a first configuration from the network node to adapt radio operations at the WCD; and
adapt a radio operation at the WCD based on the configuration.
8. The wireless communication device of claim 7 , wherein the information reported to the network node comprises a cell identifier identifying the one or more cells whose determined receive timing difference are within the threshold.
9. The wireless communication device of claim 7 , wherein the reference cell is a serving cell, or a strongest cell as measured by the WCD or a cell with the shortest propagation delay as measured by the WCD.
10. The wireless communication device of claim 7 , wherein the threshold is pre-defined, or configured by the network node, or based on a WCD capability, the WCD capability indicating the extent to which the WCD requires different signals received from different cells to be synchronized in order to operate with the different cells.
11. The wireless communication device of claim 10 , where the WCD capability is based on the number of transmitters, the number of receivers supported by the WCD, or both.
12. The wireless communication device of claim 7 , wherein the processing circuitry is configured to trigger the report of the information to the network node autonomously or in response to a request from the network.
13. The method of claim 1 , wherein the candidate cell includes a candidate network node for dual or multiple connectivity.
14. The method of claim 1 , wherein the reported information comprises a list of multiple cells that are suitable for synchronized dual or multiple connectivity with respect to the reference cell in order for the WCD to operate in a multiple connectivity mode based on the comparing.
15. The method of claim 1 , wherein the reported information comprises a list of multiple cells that are suitable for unsynchronized dual or multiple connectivity with respect to the reference cell based on the comparing.
16. The method of claim 1 , wherein the method further comprises receiving a second configuration from a network node to operate with dual or multiple connectivity and wherein the determining, the comparing, and the reporting are responsive to receiving this second configuration.
17. The method of claim 16 , wherein receiving the second configuration is responsive to the WCD transmitting information to the network node indicating a WCD capability, the WCD capability indicating the extent to which the WCD requires different signals received from different cells to be synchronized in order to operate with the different cells.
18. The method of claim 1 , wherein the threshold is pre-defined, or configured by the network node.
19. The method of claim 1 , wherein the reporting information to the network node comprises the WCD recommending handover or connectivity to a candidate cell; and the first configuration comprises a configuration to handover or connect to a network node.
20. The method of claim 1 , wherein the receiving the first configuration comprises receiving a configuration for synchronized connectivity; and the adapting the radio operation comprises adapting the WCD to switch from unsynchronized connectivity to synchronized connectivity.
21. The method of claim 1 , wherein the receiving the first configuration comprises receiving a configuration for unsynchronized connectivity; and
the adapting the radio operation comprises adapting the WCD to switch from synchronized connectivity to unsynchronized connectivity.
22. The method of claim 1 , wherein the first configuration is related to a discontinuous reception parameter; and the adapting a radio operation at the WCD comprises adapting discontinuous reception at the WCD.
23. The method of claim 1 , further comprising the WCD triggering the reporting of the information to the network node autonomously based on the determined receive timing difference and/or a reception performance in uplink from or downlink to the WCD.