UE MBSFN Subframe Decoding for Unicast Data Reception
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Solution Overview
Problem
In LTE systems, User Equipment (UE) experiences inefficiencies in data reception due to double decoding and buffering in Multimedia Broadcast Multicast Service (MBMS) subframes, leading to increased system load and resource misallocation.
Innovation Solution
A method and apparatus for UE to effectively receive data by obtaining specific indication information for MBSFN subframes, distinguishing between PMCH and PRS subframes, and decoding PDCCH and PDSCH accordingly, using extended CP for MBSFN subframes reserved for unicast data transmission, thereby preventing unnecessary decoding and buffering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE performs double decoding and buffering in MBSFN subframes to support both MBMS and unicast data, then data reception capability is improved, but system load and device complexity increase
Solution Approach 1:
The patent extracts and processes only the necessary subframes for unicast data transmission by identifying them through PDCCH decoding, while excluding MBSFN subframes dedicated to PMCH. This selective extraction approach allows the UE to handle both MBMS and unicast services without requiring full double decoding of all subframes, thereby reducing system load while maintaining data reception capability.
Solution Approach 2:
The patent segments the downlink subframes into distinct categories: MBSFN subframes for PMCH, MBSFN subframes for unicast PDSCH, and non-MBSFN subframes. By segmenting and differently handling each type, the UE can optimize its processing for each category, reducing overall complexity while maintaining versatility in receiving both broadcast and unicast data.
2Adaptability or versatility
If UE buffers all received data in MBSFN subframes for potential unicast transmission, then data reception flexibility is improved, but buffering resource usage increases
Solution Approach 1:
The patent performs preliminary identification of unicast subframes through PDCCH decoding before data reception. By preliminarily determining which MBSFN subframes contain unicast PDSCH transmissions, the UE can allocate buffering resources only for those specific subframes rather than buffering all MBSFN subframe data, thus maintaining flexibility while reducing buffering resource consumption.
Solution Approach 2:
The patent applies partial action by buffering only the necessary unicast data in identified subframes rather than all possible data. The UE performs selective buffering based on PDCCH indications, avoiding excessive buffering of MBMS-only subframes, thereby optimizing buffering resource usage while maintaining adequate flexibility for unicast reception.
3Productivity
If UE decodes PDCCH and PDSCH in all MBSFN subframes, then data throughput is improved, but false alarms and incorrect decoding increase
Solution Approach 1:
The patent applies local quality by using different decoding approaches for different subframe types. For MBSFN subframes indicated for unicast transmission, the UE decodes PDCCH and PDSCH with unicast parameters. For MBSFN subframes dedicated to PMCH, the UE uses MBMS-specific decoding. This localized differentiation improves decoding accuracy by applying the correct parameters to each subframe type while maintaining overall throughput.
Solution Approach 2:
The patent introduces dynamic subframe-specific configuration where the UE adapts its decoding behavior based on real-time PDCCH indications and subframe type identification. The system dynamically switches between MBMS and unicast reception modes for different subframes, allowing high throughput in unicast subframes while avoiding false alarms in PMCH-only subframes through appropriate mode selection.
Data Source
AI summary
A method and an apparatus for receiving data in a User Equipment (UE) supporting a Multimedia Broadcast Multicast Service (MBMS) are provided. A method of receiving data by a UE which supports an MBMS includes obtaining first indication information indicating a Multicast/Broadcast over a Single Frequency Network (MBSFN) subframe reserved for an MBSFN, obtaining second indication information indicating a subframe in the MBSFN subframe, the subframe decoding a Physical Multicast CHannel (PMCH), and when although a first subframe is indicated as the MBSFN subfame, the first subframe is not indicated to decode a PMCH and is not of a subframe for a Positioning Reference Signal (PRS), receiving a Physical Downlink Control CHannel (PDCCH) of the first subframe and decoding a corresponding Physical Downlink Shared CHannel (PDSCH).