Method and system for improvement of handover quality in mobile radio systems

摘要

A handover method includes the steps: (1a) detecting, at a serving node, signal quality of a signal transmitted from the serving node to a user equipment (UE) being worse than a predefined threshold; (1b) identifying, at the serving node, node(s) transmitting to the UE the strongest signals interfering with signals being transmitted to the UE; (1c) sending, by the serving node, a request for starting an inter-cell interference coordination scheme; (1d) rescheduling, by the node(s) identified in step (1b), users currently being served by the node(s); (1e) informing, by the node(s) identified in step (1b), the serving node of the UE which resources have, been reserved in step (1d); (1f) scheduling, by the serving node, the UE to the resources reserved in step (1d); (1g) starting, by the serving node, handover of the UE from the serving node to a target node; and (1h) completing the handover of the UE.

主权项

1. A handover method, the method comprising the steps of:
(1a) detecting, at a serving node, signal quality of a signal transmitted from the serving node to a user equipment (UE) being worse than a predefined threshold; (1b) identifying, at the serving node, node(s) transmitting to the UE the strongest signals interfering with signals being transmitted to the UE by the serving node; (1c) sending, by the serving node, a request for starting an inter-cell interference coordination scheme to the node(s) identified in step (1b); (1d) rescheduling, by the node(s) identified in step (1b), users currently being served by the node(s) identified in step (1b) so as to reserve a part of resources according to the inter-cell interference coordination scheme such that the interference, including the control channel interference, is mitigated; (1e) informing, by the node(s) identified in step (1b), the serving node of the UE; which resources have been reserved in step (1d); (1f) scheduling, by the serving node, the UE to the resources reserved in step (1d); (1g) starting, by the serving node, handover of the UE from the serving node to a target node; and (1h) completing the handover of the UE; wherein step (1h) comprises the steps of: (1h1) reserving, at the serving node, the resources identified in step (1d) such that the interference, including the control channel interference, from the serving node to the UE is mitigated; (1h2) synchronizing the UE to the target node; (1h3) scheduling, by the target node, the UE to the resources reserved in step (1d); and (1h4) releasing, after completing the handover in accordance to step (1h), the resources reserved in step (1d), by the node having acted as serving node during the preceding steps; and/or (1h5) releasing, after completing the handover in accordance to step (1h), the resources reserved in step (1d), by the interfering nodes not involved in the handover process.