Coordinated Multipoint Uplink Reception via Segmented Baseband Processing
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Solution Overview
Problem
Conventional CoMP uplink reception in wireless communication networks faces limitations due to high latency and low bandwidth in transport networks, which constrain scheduling and reduce performance, especially for devices at cell edges or under interference, leading to reduced achievable gains and increased retransmissions.
Innovation Solution
A method where a first node transmits scheduling information to a second node defining time slots for uplink transmission, allowing for coordinated multipoint reception, and processes uplink transmissions using information from the second node, including joint demodulation and decoding, to improve signal quality and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized baseband processing is used for inter-eNB CoMP, then uplink reception performance is improved, but transport network bandwidth and latency requirements increase significantly
Solution Approach 1:
The patent segments the baseband processing function into two parts: initial processing (demodulation, decoding, or soft value extraction) is performed locally at each eNB, and only the essential results (decoded data or soft values) are transmitted over the transport network. This segmentation reduces the amount of data that needs to be transported while maintaining CoMP reception benefits.
Solution Approach 2:
The patent extracts only the necessary processing results (decoded transport blocks or soft values) from the complete baseband processing chain and transmits them over the network, rather than transmitting all intermediate IQ samples. This extraction approach minimizes transport network bandwidth consumption while preserving the essential information needed for coordinated reception.
2Reliability
If IQ samples are transmitted over the transport network for joint baseband processing, then CoMP reception gain is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts only the essential processing outcomes (decoded data or soft values) from the complex baseband processing chain, eliminating the need to transmit and process large volumes of raw IQ samples. This extraction simplifies the overall system complexity while maintaining reception performance.
Solution Approach 2:
Each eNB performs self-service initial baseband processing independently, demodulating and decoding signals locally before sharing results with other eNBs. This self-service approach reduces the processing burden on the centralized system and simplifies inter-eNB coordination.
3Adaptability or versatility
If scheduling decisions are distributed to cooperating eNBs for flexibility, then scheduling adaptability is improved, but coordination overhead and latency increase
Solution Approach 1:
The patent segments the scheduling function by allowing each eNB to independently determine its own scheduling decisions based on local conditions, while still participating in coordinated reception. This segmentation provides scheduling flexibility without requiring complex centralized coordination for each scheduling decision.
Solution Approach 2:
Each eNB performs preliminary baseband processing and prepares processing results in advance before they are needed for joint decoding. This preliminary action reduces the coordination latency by having results ready when needed, rather than waiting for centralized scheduling decisions.
Data Source
Figure 1A~1B
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Figure 4
AI summary
Scheduling information for a wireless device may be transmitted from a first node of a network to the second node of the network wherein the scheduling information defines a plurality of time slots for UpLink transmission from the wireless device. After transmitting the scheduling information to the second node, a UL signaling grant may be transmitted to the wireless device for one of the time slots defined by the scheduling information. A UL transmission may be received from the wireless device at the first node over the time slot of the UL signaling grant. Information may be received from the second node relating to the UL transmission over the time slot of the UL signaling grant. The UL transmission may be processed at the first node using the information from the second node relating to the UL transmission from the wireless device.