Resource Indication Value Granularity Adjustment in Cellular Multi-Carrier Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing resource allocation schemes in cellular orthogonal frequency division multiplex (OFDM) wireless packet communication systems require a significant amount of control information to represent the range of allocated resources, which increases with the number of resource blocks, leading to inefficient signaling and potential channel coding issues.
Innovation Solution
A radio resource scheduling scheme that reduces the amount of control information by using a compact method for resource allocation, where the start point and length of allocated resource blocks are signaled with reduced bit requirements, and limiting the S and L values to multiples of G, optimizing the resource indication value (RIV) representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the existing resource allocation scheme is used to represent the range of allocated resources, then the resource allocation can be performed, but the amount of control information increases significantly with the number of resource blocks
Solution Approach 1:
The resource allocation information is segmented into two parts: a first value indicating the start point of allocated resource blocks and a second value indicating the length of allocated resource blocks. This segmentation allows for more efficient representation compared to transmitting complete resource allocation information for all resource blocks.
Solution Approach 2:
The patent changes the parameters used for resource allocation representation from a comprehensive scheme to a compact scheme using only start point and length values. Additionally, the patent limits the granularity of resource block allocation to multiples of a predetermined value G, further reducing the information required while maintaining acceptable allocation flexibility.
2Productivity
If the number of resource blocks increases, then the resource allocation capacity improves, but the amount of control information required increases
Solution Approach 1:
Instead of providing complete resource allocation information for all possible resource blocks, the patent uses partial information (start point and length) to define the allocated resources. This partial action approach significantly reduces control information while maintaining the ability to allocate resources across the entire available bandwidth.
Solution Approach 2:
The patent transforms the resource allocation representation from a one-dimensional array of resource block indicators to a two-dimensional parameter space defined by start point and length. This dimensional change allows for more efficient encoding of resource allocation information, reducing the control overhead.
3Loss of information
If the start point and length of allocated resource blocks are signaled with reduced bit requirements, then the signaling efficiency improves, but the precision of resource allocation may be reduced
Solution Approach 1:
The patent changes the precision parameter by limiting resource block allocation granularity to multiples of a predetermined value G. This parameter change reduces the signaling requirements while maintaining sufficient allocation precision for practical purposes. The value G can be configured to balance between signaling efficiency and allocation precision requirements.
4Device complexity
If the S and L values are limited to multiples of G, then the resource indication value representation is optimized, but the flexibility of resource allocation is reduced
Solution Approach 1:
The patent introduces a granularity parameter G that limits the start point and length values to multiples of G. This parameter change simplifies the Resource Indication Value (RIV) representation and reduces the control information required. The flexibility-loss tradeoff is managed by allowing G to be configured based on system requirements, with smaller G values providing more flexibility and larger G values providing better compression.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for receiving a downlink signal by an apparatus in a wireless mobile communication system is disclosed. Common downlink control information including a resource indication value, RIV, wherein the RIV is mapped to a start index S and a length L of consecutive virtual resource blocks, VRBs, is received and the downlink signal is received on the consecutive VRBs. The start index, S, is an element of a first set {s: s=mG<└NVRB/G┘·G} and the length, L, is an element of a second set {1: 1=nG≤└NVRB/G┘·G}, where m is an integer of 0 or higher, n is an integer of 1 or higher, NVRB is the number of VRBs in a downlink system bandwidth, and G is an integer of 2 or higher.