Network MIMO Control for Make-Before-Break Handovers
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Solution Overview
Problem
In 5G wireless networks, dense cell deployments increase latency and service interruptions due to the complexity of maintaining session continuity during handovers, especially with massive MIMO schemes and break-before-make handovers, which are inefficient in dense environments.
Innovation Solution
Implementing a network MIMO scheme where a control device manages lower layer procedures and enables make-before-break handovers by synchronizing orthogonal transmissions from non-collocated radio nodes, allowing users to maintain continuous connections by adjusting precoders and channel information dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If break-before-make handovers are used in massive MIMO schemes, then device complexity is reduced, but latency increases and service interruptions occur
Solution Approach 1:
The patent implements make-before-break handovers where the UE establishes a connection with the target base station before releasing the connection with the current base station. This preliminary action of pre-establishing the target connection eliminates service interruptions and reduces handover latency, directly resolving the technical contradiction between simplified handover management and reduced time loss.
2Productivity
If dense cell deployments are implemented, then network capacity increases, but latency increases and service interruptions occur
Solution Approach 1:
The patent maintains continuous communication service during handovers by keeping the UE connected to both source and target base stations simultaneously during the handover transition. This continuity of useful action ensures that data transmission never stops, eliminating service interruptions while supporting dense cell deployments that increase network capacity.
3Reliability
If synchronized orthogonal transmissions from non-collocated radio nodes are implemented, then reliability improves, but device complexity increases
Solution Approach 1:
The patent introduces a control device as an intermediary that manages lower layer procedures and coordinates the synchronized orthogonal transmissions from multiple non-collocated radio nodes. This intermediary handles the complexity of transmission coordination, allowing reliable continuous connections during handovers without requiring the UEs themselves to manage the complex synchronization procedures.
Data Source
AI summary
In some implementations, a control device may transmit, to a set of radio units (RUs), an indication of orthogonal codes for respective RUs from the set of RUs, wherein the set of RUs are non-collocated. The control device may transmit, to one or more user equipment (UEs), an indication of the orthogonal codes for the respective RUs from the set of RUs. The control device may transmit, to the set of RUs, control information to cause the set of RUs to transmit orthogonal transmissions, using the orthogonal codes, to at least one UE from the one or more UEs.