Dynamic Bitmap Bit Indication for D2D Subframe Allocation
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Solution Overview
Problem
The existing D2D communication systems face limitations in flexibility and resource utilization due to the fixed bitmap sequence length and limited Time Resource Pattern (TRP) indication overhead, which restricts the configuration of Physical Sidelink Shared Channel (PSSCH) subframes.
Innovation Solution
The method and device indicate the number of effective indication bits in a bitmap sequence through high layer or physical layer signaling, allowing the transmitter UE and/or network entity to configure PSSCH subframes, enhancing flexibility and resource utilization by dynamically adjusting the number of effective indication bits via various signaling methods such as broadcast messages, SIB, RRC messages, and sidelink resource scheduling control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed bitmap sequence length is used for TRP indication, then the indication overhead is limited and simple, but the flexibility of D2D PSSCH subframe configuration is limited
Solution Approach 1:
The patent applies dynamics by making the bitmap sequence length configurable rather than fixed. The network entity can dynamically adjust the number of effective indication bits in the bitmap sequence according to actual D2D communication requirements, allowing the system to adapt between different configuration scenarios (e.g., using 3 bits for sparse subframes or 12 bits for dense subframes) without changing the underlying system architecture.
Solution Approach 2:
The patent changes the parameter of bitmap sequence length from a fixed value to a configurable parameter. By allowing the network entity to indicate different numbers of effective bits (e.g., k=3, k=12) in the TRP signaling, the system can optimize the balance between indication overhead and configuration flexibility based on traffic patterns and resource allocation needs.
2Adaptability or versatility
If the number of effective indication bits is increased, then the flexibility of subframe configuration is improved, but the indication overhead increases
Solution Approach 1:
The system dynamically adjusts the number of effective indication bits based on actual configuration needs. When dense subframe allocation is required, more bits (e.g., 12) are used; when sparse allocation suffices, fewer bits (e.g., 3) are used. This dynamic adjustment optimizes the trade-off between flexibility and overhead in real-time.
Solution Approach 2:
The patent changes the effective number of bits in the bitmap sequence from a fixed parameter to a configurable parameter. The network entity can indicate different values of k (number of effective bits) to match the actual subframe allocation density requirements, thereby optimizing the balance between configuration capability and signaling overhead.
3Productivity
If the TRP indication overhead is limited, then the signaling complexity is reduced, but the resource utilization rate decreases
Solution Approach 1:
The system dynamically scales the TRP indication overhead according to resource utilization requirements. When high resource utilization is needed (e.g., during peak traffic), the network entity configures more effective bits in the bitmap sequence, allowing finer-grained subframe allocation. When traffic is light, fewer bits are used, reducing signaling complexity.
Solution Approach 2:
The patent enables the TRP indication overhead to be adjusted by changing the number of effective bits parameter. This allows the system to optimize resource utilization by allocating more subframes when needed (using more bits) while maintaining low signaling overhead when fewer subframes are required, achieving adaptive resource management.
Data Source
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AI summary
A method and device for indicating the number of bits are provided. In the method, a transmitting User Equipment (UE) and/or a network entity indicate the number k of effective indication bits in a bitmap sequence, the bitmap sequence indicates Physical Sidelink Shared Channel (PSSCH) subframes allocation, k includes one or multiple values, 1 ≤ k ≤ N, and N is a bit length of the entire bitmap sequence. This technical scheme solves the problem in the related art of low flexibility in Device-to-Device (D2D) PSSCH subframe configuration. By virtue of the technical scheme, the effect of increased flexibility of D2D PSSCH subframe configuration and increased resource utilization rate can be achieved.