Multicast DRX Operations Using MAC Control Elements
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Solution Overview
Problem
The challenge in wireless communication systems is the efficient utilization of limited radio resources for managing uplink/downlink data and control information, particularly in applications sensitive to delay or latency, such as multicast discontinuous reception (DRX) operations.
Innovation Solution
A method and apparatus for performing multicast DRX operations in a wireless communication system, involving the reception of a Physical Downlink Control Channel (PDCCH) and Physical Downlink Shard Channel (PDSCH) with a Medium Access Control (MAC) Protocol Data Unit (PDU) that includes a DRX command MAC control element, enabling the UE to perform multicast DRX operations based on this command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the BS transmits more data and control information to UEs, then the service coverage and data throughput are improved, but the limited radio resources are exhausted faster and latency increases
Solution Approach 1:
The patent implements periodic DRX cycles where UEs alternate between active reception periods and sleep periods. This periodic action allows UEs to receive data in scheduled intervals rather than continuously, reducing latency by ensuring data is available when needed while conserving radio resources during inactive periods.
Solution Approach 2:
The patent uses advance scheduling mechanisms where the BS pre-allocates time slots and resources for data transmission. This preliminary action allows UEs to prepare for upcoming data reception, reducing latency by eliminating last-minute resource allocation delays and ensuring smooth data flow when transmission time arrives.
2Adaptability or versatility
If the BS provides services to more UEs in a prescribed resource region, then the service coverage is improved, but the limited radio resources per UE are reduced
Solution Approach 1:
The patent segments the service region into multiple prescribed resource regions, each with dedicated BS resources. This segmentation allows the BS to allocate radio resources more efficiently across multiple UEs by treating each region independently, preventing resource exhaustion in any single area while maintaining broad service coverage.
Solution Approach 2:
The patent implements a universal DRX framework that works for both unicast and multicast communications. This multi-functionality allows the same resource allocation and scheduling mechanisms to serve diverse UE types and communication modes, maximizing resource utilization efficiency across the entire service area.
3Loss of energy
If DRX cycles are implemented to save energy, then the energy consumption is reduced, but the latency for data reception increases
Solution Approach 1:
The patent implements dynamic DRX cycle adjustment where the cycle duration and timing are adapted based on current network conditions, UE activity patterns, and data priority levels. This dynamic adjustment allows the system to optimize between energy savings and latency performance in real-time, reducing latency for critical data while maintaining energy efficiency for less time-sensitive transmissions.
Data Source
AI summary
The present disclosure relates to a method of performing operations for a User Equipment (UE) in a wireless communication system. In particular, the method includes the steps of: receiving a Physical Downlink Control Channel (PDCCH) addressed to a Cell-Radio Network Temporary Identifier (C-RNTI) for a Hybrid Automatic Repeat and request (HARQ) process; receiving a Physical Downlink Shard Channel (PDSCH) including a Medium Access Control (MAC) Protocol Data Unit (PDU) based on the PDCCH, wherein the MAC PDU includes a discontinuous reception (DRX) command MAC control element (CE); and based on the MAC PDU further including multicast data, performing a multicast DRX operations based on the DRX command MAC CE.