Unified DCI Bitmap for Multi-UE Resource Allocation
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Solution Overview
Problem
In LTE systems, the exponential increase in system signaling overheads due to the use of bitmaps for resource allocation in downlink control information (DCI) becomes significant as the number of user equipment (UEs) accessing the base station increases, leading to inefficient resource utilization and increased communication delays.
Innovation Solution
The method involves generating and sending downlink control information with public resource allocation indication information that includes binary code substrings to indicate resources allocated to multiple UEs, allowing each UE to obtain resource allocation information efficiently, thereby reducing the overall resources occupied by the resource allocation indicator and system signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If separate bitmaps are used for resource allocation indication to each UE, then resource allocation information can be clearly indicated to each UE, but system signaling overheads increase exponentially as the number of UEs increases
Solution Approach 1:
The patent merges separate resource allocation bitmaps for multiple UEs into a single unified bitmap structure. Instead of transmitting individual bitmaps to each UE (which causes exponential overhead growth), the system combines all UE resource allocations into one shared bitmap that is scrambled and distributed to multiple UEs. This merging approach maintains complete resource allocation information while reducing total signaling overhead from O(N) separate bitmaps to a single consolidated bitmap.
Solution Approach 2:
The unified bitmap structure serves multiple UEs simultaneously rather than being dedicated to a single UE. Each UE can extract its own resource allocation information from the same bitmap by using its unique identifier for scrambling/descrambling operations. This universal bitmap structure allows one signaling message to fulfill the resource allocation indication function for multiple UEs, eliminating the need for separate dedicated bitmaps.
2Adaptability or versatility
If more resources are allocated for bitmaps to support more UEs, then more UEs can access the base station, but the resources occupied by bitmaps increase
Solution Approach 1:
The patent combines resource allocation information for multiple UEs into a single unified bitmap, allowing the system to support more UEs without proportionally increasing resource consumption. The unified structure enables efficient packing of allocation data for N UEs into one compact representation, rather than requiring N separate bitmap structures that would consume exponentially more resources.
Solution Approach 2:
The patent changes the parameter representation by using UE-specific scrambling identifiers to differentiate between UEs within the unified bitmap. Instead of allocating separate bitmap structures for each UE, the system maintains a single bitmap structure and uses parameter changes (scrambling codes based on UE identifiers) to enable each UE to identify and extract its own allocation information, thereby supporting more UEs with constant resource overhead.
3Loss of information
If separate DCI messages are sent to each UE for resource allocation, then each UE can obtain its allocation information, but the overall DCI resource consumption increases
Solution Approach 1:
The patent merges multiple separate DCI messages containing resource allocation bitmaps into a single unified DCI structure. Instead of transmitting N separate DCI messages to N different UEs (each with its own bitmap), the system transmits one unified DCI message containing a consolidated bitmap that encodes resource allocations for all UEs. This merging reduces DCI resource consumption from O(N) separate messages to a single shared message while preserving complete allocation information.
Solution Approach 2:
The unified bitmap acts as an intermediary structure that carries resource allocation information for multiple UEs simultaneously. Each UE uses its identifier as a scrambling key to process the unified bitmap and extract its specific allocation information. This intermediary approach eliminates the need for multiple separate DCI messages while ensuring each UE receives its dedicated allocation data through the shared unified structure.
Data Source
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AI summary
Embodiments of the present invention provide a resource allocation information indication method, a base station, a user equipment, and a system. In technical solutions of the embodiments of the present invention, a base station generates and sends downlink control information that includes public resource allocation indication information to a UE, and the public resource allocation indication information is used to indicate resources allocated to multiple UEs. The UE obtains information about allocated resources according to the public resource allocation indication information. Therefore, a quantity of resources occupied by a resource allocation indicator is reduced, a quantity of resources occupied by entire DCI is reduced, and system signaling overheads are reduced. Particularly, when the method is applied to a short-subframe service scenario, signaling overheads are further reduced and system performance is improved.