Wireless Device Walsh Sequence Allocation for Flexible Scheduling
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Solution Overview
Problem
In MU-MIMO systems, the requirement for perfectly matched bandwidths and transmission band positions of clusters to maintain orthogonality of DM-RSs reduces frequency scheduling flexibility and deteriorates system throughput performance.
Innovation Solution
A radio communication apparatus and method that receives continuous band allocation information and acquires control information to associate band reporting order with control information, allowing for flexible frequency scheduling and orthogonalization of DM-RSs even when clusters have different bandwidths and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DM-RSs of multiple terminals are orthogonalized using CS-ZC sequences in MU-MIMO, then terminal data demultiplexing is enabled, but the bandwidths and transmission band positions of clusters must be perfectly matched, reducing frequency scheduling flexibility
Solution Approach 1:
The patent segments the frequency band into multiple clusters and associates each cluster with a specific ZC sequence index. By dividing the frequency resources into discrete cluster units and assigning them to specific terminals with corresponding ZC sequences, the system achieves DM-RS orthogonality without requiring perfect bandwidth matching across all terminals. Each terminal's clusters are independently managed with their own ZC sequence associations.
Solution Approach 2:
The patent changes the parameter association from requiring exact bandwidth and position matching to using ZC sequence indices as the distinguishing parameter. Instead of relying on identical bandwidth configurations, the system uses different ZC sequence indices (e.g., first ZC sequence index for first terminal, second ZC sequence index for second terminal) to achieve orthogonality, thereby enabling flexible bandwidth allocation.
2Reliability
If clusters of terminals are perfectly matched to maintain DM-RS orthogonality, then orthogonality is preserved, but system throughput performance deteriorates due to reduced scheduling flexibility
Solution Approach 1:
The patent introduces dynamic association between terminals and ZC sequence indices through the band reporting order mechanism. The base station can dynamically determine which ZC sequence index to associate with which terminal based on the reported band information, allowing flexible adaptation to different scheduling scenarios. This dynamic approach enables the system to optimize throughput by adapting to varying traffic conditions and terminal requirements.
Solution Approach 2:
The patent introduces the ZC sequence index as an intermediary parameter that mediates between the frequency cluster allocation and terminal identification. Instead of directly requiring perfect bandwidth matching between terminals, the ZC sequence index serves as an intermediate identifier that enables orthogonality maintenance while allowing flexible bandwidth allocation. The base station uses this intermediary to manage the mapping between allocated clusters and terminals.
3Adaptability or versatility
If multiple RIVs are transmitted to notify non-contiguous band allocation, then allocation flexibility is improved, but the number of signaling bits increases
Solution Approach 1:
The patent performs preliminary association between band reporting order and ZC sequence indices before the actual resource allocation. By pre-establishing this mapping relationship, the base station can efficiently convey allocation information using the band reporting order itself as the indicator, without needing to transmit additional RIVs for each cluster. This preliminary setup reduces the signaling overhead while maintaining allocation flexibility.
Solution Approach 2:
The patent makes the band reporting order serve multiple functions: it indicates both the frequency cluster allocation and the associated ZC sequence index. Instead of requiring separate signaling for cluster identification and ZC sequence assignment, the band reporting order acts as a universal indicator that conveys both pieces of information, thereby reducing the total number of signaling bits needed.
Data Source
AI summary
Disclosed are a wireless communication method and device which can maintain frequency scheduling flexibility and improve system throughput performance. A Walsh sequence number determination unit (108) acquires Walsh sequence numbers used in each cluster according to a bandwidth notification order indicated by a plurality of RIVs, on the basis of associations between the bandwidth notification order indicated by the plurality of RIVs and Walsh sequence numbers used in each cluster. Furthermore, the Walsh sequence number determination unit (108) independently sets the acquired Walsh sequence number to each cluster multiplexed between two different terminals in the same bandwidth.