HS-SCCH Control Signaling for MIMO Layer Number Transmission
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Solution Overview
Problem
Current WCDMA systems face challenges in efficiently transmitting layer number information for multiple-antenna MIMO operations, which is essential for improving cell throughput and supporting advanced technologies like 64QAM and QPSK combinations, due to limitations in the number of bits available for signaling in the HS-SCCH format.
Innovation Solution
The method involves adding bit information indicating layer number information to the control information, performing channel coding, and rate matching to generate a symbol sequence that is sent over the HS-SCCH, allowing the UE to receive and parse this information, thereby enabling multiple-antenna MIMO operations by modifying the existing HS-SCCH format to include additional bits for layer number and precoding weight information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the HS-SCCH format is modified to include layer number information bits, then multiple-antenna MIMO operations can be supported, but the complexity of the control channel increases
Solution Approach 1:
The control information is segmented into two parts: Part 1 contains essential information (channelization-code-set, modulation scheme, precoding weight, layer number) while Part 2 contains supplementary information (transport-block size, HARQ process, redundancy version, UE identity). This segmentation allows the control channel to support MIMO operations by including layer number information in Part 1 without overwhelming the overall structure.
Solution Approach 2:
The patent extends the control information structure by adding a new dimension - layer number information (2 bits) is introduced alongside existing dimensions such as modulation scheme (2 bits), precoding weight (2 bits), and channelization-code-set (7 bits). This dimensional extension enables MIMO functionality while maintaining the organized structure of the control channel.
2Productivity
If more bits are allocated for layer number and precoding weight information, then MIMO performance improves, but the total control information size increases
Solution Approach 1:
The patent optimizes the bit allocation parameters to achieve the right balance: 2 bits for layer number information (supporting up to 4 layers), 2 bits for precoding weight, 2 bits for modulation scheme, and 7 bits for channelization-code-set. This parameter configuration enables MIMO operations with improved data transmission efficiency while keeping the total control information size manageable at 21 bits for Part 1.
Data Source
Figure 1~2A
Figure 2B~3
Figure 4A~4B
AI summary
Embodiments of the present invention provide a method for sending control information and a base station. The method includes: performing rate matching on a coded sequence obtained by performing channel coding on second control information to obtain a symbol sequence, where the second control information includes bit information indicating layer number information; and sending the symbol sequence to a user equipment UE over a high speed shared control channel HS-SCCH. In the technical solutions of the present invention, by adding the bit information indicating layer number information to the control information, the objective of notifying the UE of the layer number information is achieved.