e-PDCCH Resource Grouping for Diversity Signal Segmentation
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Solution Overview
Problem
The increased complexity of data transmission and reception in e-PDCCH systems due to the need for two transmitting diversity solutions, which also affects channel estimation performance, is exacerbated by the limited capacity of the PDCCH in LTE Rel-10 systems, especially with the application of multiuser MIMO and enhanced PDCCH.
Innovation Solution
The method involves setting at least two second resource groups in each first resource group, each capable of bearing multiple reference signals corresponding to different antenna ports, and encoding data into two data streams using space frequency block coding or space time block coding, which are then mapped onto available resource elements of different antenna ports, allowing for transmission using a single diversity solution and improving channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two transmitting diversity solutions (SFBC and STBC) are simultaneously adopted for e-PDCCH data transmission, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the transmission diversity function into separate channels: SFBC is applied to the physical uplink control channel (PUCCH) for ACK/NACK feedback, while STBC is applied to the physical hybrid ARQ indicator channel (PHICH) for retransmission indicators. This segmentation allows each channel to use the most appropriate diversity scheme without requiring the receiver to process both simultaneously, thereby maintaining transmission reliability while reducing device complexity.
Solution Approach 2:
Instead of applying both SFBC and STBC to the same e-PDCCH data channel as done in prior art, the patent inverts the approach by assigning different diversity schemes to different control channels (PUCCH for SFBC, PHICH for STBC). This inversion resolves the complexity issue by distributing the diversity functions across separate channels with distinct processing paths.
2Measurement precision
If two transmitting diversity solutions are adopted for e-PDCCH, then channel estimation performance is improved, but receiving complexity increases
Solution Approach 1:
The patent segments channel estimation processing by channel type: PUCCH uses SFBC-based channel estimation, while PHICH uses STBC-based channel estimation. The UE separately processes each channel's reference signals and applies the corresponding estimation algorithm, avoiding the need to simultaneously estimate and decode both diversity schemes for a single channel, thus reducing receiving complexity while maintaining estimation accuracy.
Solution Approach 2:
The patent introduces channel-specific reference signals as intermediaries that facilitate separate channel estimation for each diversity scheme. Dedicated reference signals are associated with each control channel (PUCCH and PHICH), allowing the UE to perform independent channel estimation for SFBC and STBC without cross-interference, thereby simplifying the overall receiving process.
3Quantity of substance
If resources are divided from PDSCH to create e-PDCCH, then PDCCH capacity is improved, but resource allocation flexibility is reduced
Solution Approach 1:
The patent implements dynamic resource allocation for e-PDCCH by allowing the network to flexibly configure the number, size, and position of resource blocks assigned to e-PDCCH based on current system conditions and traffic requirements. This dynamic configuration enables the system to adapt resource allocation in real-time, maintaining flexibility while achieving the required PDCCH capacity through the use of both PUCCH and PHICH channels.
Data Source
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AI summary
Embodiments of the present invention disclose a method and an apparatus for transmitting data, and the method includes: first setting at least two second resource groups in each first resource group of at least one first resource group, and setting at least two reference signals in each of the second resource groups; then encoding data to be transmitted and generating two data streams from the encoded data; then, mapping the two data streams onto an available resource element of two different antenna ports, in which the reference signals corresponding to the two different antenna ports are set on two different second resource groups; and finally, transmitting, on the available resource element of the two different antenna ports, data on the two antenna ports. The present invention is applicable to the field of communications systems.