HS-SCCH Merging for MU-MIMO Relay Control Channel Efficiency
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Solution Overview
Problem
In WCDMA systems using MU-MIMO technology, the prior art experiences a waste of channel resources and decreased throughput due to the excessive use of HS-SCCHs when transmitting control channel information to multiple relays, as each relay requires separate HS-SCCHs, leading to inefficiency and resource wastage.
Innovation Solution
The method involves selecting an optimal precoding code book for each relay such that the code books are orthogonal, allowing control channel information from two relays to be encapsulated and scrambled into a single HS-SCCH, which is then sent to both relays, reducing the number of HS-SCCHs required and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate HS-SCCHs are used for each relay in MU-MIMO transmission, then control channel information can be reliably transmitted to each relay, but the number of HS-SCCHs increases exponentially, occupying all control channels and wasting data code channels
Solution Approach 1:
The patent merges control channel information of multiple relays into a single HS-SCCH by using orthogonal precoding codebooks. Instead of allocating separate HS-SCCHs to each relay, the base station encapsulates control information for multiple relays (first relay and second relay) into one HS-SCCH, which is then scrambled and transmitted. Each relay can independently extract its control information using its specific orthogonal codebook, thus reducing HS-SCCH occupation from multiple to one while maintaining reliable transmission.
2Reliability
If two HS-SCCHs are used to transmit control channel information of two MU-MIMO relays, then each relay can descramble its control information, but additional overheads such as CRC code and message header are incurred, causing resource waste
Solution Approach 1:
The patent combines control channel information for multiple relays into a single HS-SCCH transmission. The base station encapsulates control information for the first relay and second relay together in one HS-SCCH, applying a single set of overhead elements (one CRC code and one message header) rather than separate overhead for each relay. This merging approach reduces the total quantity of channel resources consumed while ensuring each relay can successfully receive and descramble its control information using orthogonal codebooks.
3Adaptability or versatility
If multiple HS-SCCHs are allocated to MU-MIMO relay groups, then control channel information can be transmitted to all relays, but control channels become fully occupied leaving remaining data code channels unused, resulting in resource waste
Solution Approach 1:
The patent makes the single HS-SCCH universal for serving multiple relays simultaneously. By using orthogonal precoding codebooks, the same HS-SCCH can be received and decoded by multiple relays (first relay, second relay, and potentially more groups), giving the control channel multi-functionality. This eliminates the need for separate dedicated HS-SCCHs for each relay or relay group, freeing up data code channels for actual data transmission and improving overall system productivity while maintaining adaptability to schedule multiple relays.
Data Source
AI summary
The present invention discloses a method, device, and system for sending and receiving control channel information. When a base station schedules a first relay, the base station selects a second relay according to an optimal precoding code book selected by the first relay. An optimal precoding code book selected by the second relay is orthogonal to the optimal precoding code book selected by the first relay. Control channel information of the first relay and control channel information of the second relay his encapsulated into a high speed downlink shared control channel HS-SCCH, and scrambling the HS-SCCH. The scrambled HS-SCCH is sent to the first relay and the second relay.