RNTI Grouping for PDCCH Resource Allocation in 5G
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Solution Overview
Problem
In 5G and LTE networks, CCE conflicts occur due to random assignment of RNTIs to UEs, leading to inefficient resource allocation, increased power consumption, and reduced cell throughput.
Innovation Solution
A method and apparatus for strategically assigning RNTIs to UEs, either using a static list or grouping RNTIs, to ensure that PDCCH allocation for one UE starts from the first CCE within its search space, reducing CCE conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RNTIs are randomly assigned to UEs, then UE identification and resource allocation can be performed, but CCE conflicts occur frequently leading to increased power consumption and reduced cell throughput
Solution Approach 1:
The patent changes the RNTI assignment parameter from random to structured/grouped assignment. UEs are assigned RNTIs based on their association with specific aggregation levels and CCE groups, transforming the assignment mechanism from unpredictable to controlled, thereby eliminating CCE conflicts while maintaining reliable resource allocation
Solution Approach 2:
The patent segments the CCE resources into different groups associated with different aggregation levels. By dividing the CCE space into distinct groups (e.g., first group for aggregation level 1, second group for aggregation level 2), the system prevents overlaps and conflicts between UEs with different aggregation level requirements
2Reliability
If more OFDM symbols are used to accommodate CCE requests, then all UE CCE requests can be satisfied, but PDCCH resource consumption increases reducing cell throughput
Solution Approach 1:
The patent performs preliminary grouping of UEs by aggregation level before CCE allocation. By pre-organizing UEs into groups based on their aggregation level requirements and assigning them to corresponding CCE groups, the system ensures efficient resource utilization without needing to expand OFDM symbol usage
3Reliability
If CCE assignment does not start from the first CCE of search space, then CCE conflicts can be avoided, but UE blind detection complexity and power consumption increase
Solution Approach 1:
The patent applies local quality by assigning specific CCE group characteristics to different UE types. Each aggregation level group is assigned to a specific CCE group with dedicated starting positions, ensuring that PDCCH allocation for each UE starts from the first CCE within its assigned search space, thereby reducing blind detection complexity while avoiding conflicts
Data Source
AI summary
A method implemented by a network node in a communication network is provided. The method comprises: assigning a radio network temporary identity (RNTI) comprised in one of a first number of groups corresponding to an aggregation level to a user equipment (UE) associated with the one group; wherein for the first number of UEs, different UEs are associated with different groups corresponding to different control channel elements (CCEs). In the present disclosure, the number of OFDM symbols used for the PDCCH can be reduced, thereby increasing cell throughout since less PDCCH resource implies more PDSCH resources, and decreasing PDCCH blind detection duration and UE power consumption.