HS-SCCH Control Signaling for MIMO Layer Number Mapping
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Solution Overview
Problem
Current WCDMA systems face challenges in efficiently transmitting layer number information in multiple-antenna MIMO operations, which is essential for improving cell throughput and supporting advanced data transmission techniques, due to limitations in existing control channels.
Innovation Solution
The method involves adding bit information indicating layer number information to control information, performing channel coding, and rate matching to generate a symbol sequence, which is then sent over a high-speed shared control channel (HS-SCCH) to notify user equipment (UE) of layer number mapping, thereby enabling multiple-antenna MIMO operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If existing control channel formats are used, then the system maintains backward compatibility, but layer number information cannot be transmitted
Solution Approach 1:
The patent embeds layer number information within the existing HS-SCCH type 3 format by reusing and extending existing bit fields. Specifically, it repurposes the modulation and data block information field (originally 3 bits) to jointly indicate both modulation scheme and layer number, and extends precoding weight information from 2 bits to 4 bits. This nested approach allows new information to be transmitted without creating a completely separate control channel structure.
Solution Approach 2:
The patent changes the parameter allocation within the control information format. It modifies the modulation and data block information field to encode both modulation type and layer number, and increases precoding weight information bits from 2 to 4 bits. These parameter changes enable the transmission of layer number information while maintaining the overall HS-SCCH type 3 format structure, thus resolving the contradiction between information completeness and format complexity.
2Adaptability or versatility
If control information is extended to include layer number information, then multiple-antenna MIMO operations are enabled, but the control channel requires more bits
Solution Approach 1:
The patent merges the indication of modulation scheme and layer number into a single joint encoding field. Instead of using separate fields for modulation and layer number, it combines them into the modulation and data block information field, which now jointly indicates both parameters. This merging reduces the total bit requirement compared to having separate dedicated fields for each parameter.
Solution Approach 2:
The patent makes the modulation and data block information field multi-functional by having it serve dual purposes: indicating both the modulation scheme and the layer number. This universal field performs multiple functions that would traditionally require separate dedicated fields, thereby reducing the overall control information bit length while still providing necessary MIMO operation parameters.
3Adaptability or versatility
If precoding weight information bits are increased, then more antennas and layers are supported, but control channel overhead increases
Solution Approach 1:
The patent implements dynamic precoding weight information by using 4 bits to indicate both the number of layers and the specific precoding weights. This dynamic encoding allows the system to adapt to different antenna configurations and layer numbers without requiring a fixed, overly generous bit allocation. The dynamic nature of the encoding optimizes the balance between supporting multiple antennas/layers and controlling the bit overhead.
Data Source
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. The second control information includes bit information indicating layer number information. The method also includes sending the symbol sequence to a user equipment (UE) over a high speed shared control channel (HS-SCCH).