Downlink Resource Allocation via Dedicated Physical Channels
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Solution Overview
Problem
In wireless communication systems, particularly in LTE Release 8, UEs face difficulties in decoding DL control channels due to interference, which hinders the decoding of DL data channels, especially in scenarios with strong interference, where advanced receivers like interference cancellation are required.
Innovation Solution
The system enables the transmission of DL system information, paging information, and unicast data without using control channel information, allowing UEs to determine resource allocation based on selected downlink information, such as cell identity, system frame number, or cyclic prefix type, without decoding control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channels are used to signal resource allocation for paging and system information, then resource allocation can be dynamically indicated, but UEs experience difficulty decoding these channels due to interference, especially in strong interference environments
Solution Approach 1:
The patent extracts the resource allocation indication function from the control channel and implements it through dedicated physical channels (P-SICH for paging, P-SCH for system information). This separation removes the harmful dependency on decoding control channels, allowing UEs to acquire resource allocation information without being affected by control channel interference.
Solution Approach 2:
The patent introduces intermediate physical channels (P-SICH and P-SCH) as mediators between the network and UEs for transmitting resource allocation information. These intermediary channels are specifically designed to carry only resource allocation indications without requiring UE to decode complex control channel formats, thus reducing the impact of interference.
2Measurement precision
If advanced receiver techniques like interference cancellation are used to decode control channels, then decoding capability is improved, but system complexity increases and control channel decoding is still required before data channel decoding
Solution Approach 1:
The patent extracts the resource allocation indication functionality from the control channel and places it in dedicated physical channels. This allows UEs to obtain resource allocation information through simple detection rather than complex control channel decoding, eliminating the need for advanced receiver techniques and reducing device complexity.
Solution Approach 2:
The patent segments the downlink information transmission into separate functional components: control channels for other purposes and dedicated physical channels (P-SICH, P-SCH) specifically for resource allocation indications. This segmentation allows UEs to selectively decode only the resource allocation information without needing to decode the entire control channel structure.
3Loss of information
If control channels are decoded to access data channels, then proper resource allocation can be determined, but the decoding process is blocked by interference on control channels
Solution Approach 1:
The patent extracts resource allocation indication transmission from the control channel and implements it through dedicated physical channels (P-SICH for paging, P-SCH for system information). This extraction ensures that resource allocation information can be acquired independently of control channel decoding, preventing interference from blocking information acquisition.
Solution Approach 2:
The patent transmits resource allocation indications on dedicated physical channels before the UE needs to access the data channels. This preliminary action provides UEs with the necessary resource allocation information in advance, allowing them to directly access and decode data channels without being blocked by control channel interference.
Data Source
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AI summary
Systems and methods facilitating communication of downlink information are provided. In one embodiment, a method can include receiving a signal indicative of a base station enabling or disabling a function, wherein the function is configured to transmit information carried in control channels using selected downlink information; receiving the selected downlink information at one or more locations; and determining a resource allocation of at least one of paging information or system information or unicast data information based, at least, on the selected downlink information. The determining can be performed without decoding control channels corresponding to the selected downlink information in response to receiving a signal indicative of the function being enabled.