Base Station Resource Block Grouping for Control Overhead Reduction
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Solution Overview
Problem
Current systems face challenges in efficiently exchanging data mapping information between mobile stations and base stations in EUTRA, leading to significant overhead due to the large number of bits required for mobile station identifiers, especially in systems with 20-MHz frequency bandwidth, where 960 blocks need 16 bits each, resulting in substantial control information overhead.
Innovation Solution
A base station device assigns resource blocks to mobile stations, allocating a first mobile station identifier for each resource block group, which includes connection control information transmitted during communication, allowing for efficient resource allocation and reducing the number of bits needed for identification by using shared control information and additional identifiers as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 16-bit mobile station identifiers are allocated to each of the 960 resource blocks in a 20-MHz system, then each mobile station can be uniquely identified, but the control information overhead becomes substantially large
Solution Approach 1:
The patent segments the identification function by introducing a resource block group concept that groups multiple resource blocks together. Instead of allocating identifiers to each individual resource block, identifiers are allocated to groups, reducing the total number of identifiers needed while maintaining the ability to uniquely identify mobile stations on specific resource allocations
Solution Approach 2:
The patent adds a grouping dimension to the resource allocation structure by introducing resource block groups as an intermediate layer between resource blocks and mobile station identifiers. This dimensional change allows for more efficient identifier usage by operating at the group level rather than the individual block level
2Adaptability or versatility
If resource allocation flexibility is maintained in time/frequency direction, then adaptive resource assignment is possible, but the complexity of managing mobile station identifiers increases
Solution Approach 1:
The patent segments the resource space into resource block groups that can be independently allocated to different mobile stations. This segmentation maintains flexibility in time/frequency resource assignment while simplifying identifier management by reducing the granularity at which identifiers are applied
Solution Approach 2:
The resource block group structure serves multiple functions: it enables flexible resource allocation in time and frequency domains, reduces the number of identifiers needed, and provides a manageable unit for scheduling and resource assignment operations
Data Source
AI summary
To effectively control information on allocation of a radio resource for each mobile station, improve the frequency use efficiency of the entire communication system, and effectively execute base station/mobile station control, a mobile station holds a Chunk Table (TB) in advance and successively receives the SCSCH (Shared Control Signaling Channel) of each predetermined available Chunk from the head of a radio frame. If the SCSCH has a mobile station identifier of the mobile station assigned, the mobile station receives an SDCH (Shared Data Channel) of the corresponding RB (Resource Block) and acquires a CID (Chunk ID). Here, user data may be simultaneously contained in the SDCH. The mobile station registers the acquired CID in the Chunk Table. Moreover, the base station side also has the Chunk Table corresponding to each mobile station and manages whether a CID has been allocated for each mobile station.