Uplink Multiplexing Prioritization for Power-Restricted Wireless Devices
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Solution Overview
Problem
Third generation (3G) wireless communication systems face challenges in maintaining quality of service (QoS) requirements for individual data flows in enhanced uplink (EU) due to the lack of distinct multiplexing rules for logical channels with varying priorities, leading to potential data blocking during power restrictions.
Innovation Solution
Defining specific combinations of MAC-d flows and logical channels that can be multiplexed within a MAC-e PDU, with rules ensuring guaranteed data rates and prioritization, and allowing certain combinations to bypass power restrictions, enabling continuous transmission without requiring additional EU channel allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple logical channels with different QoS requirements are mapped to a single EU TrCH, then radio resource efficiency is improved, but QoS differentiation and prioritization are lost
Solution Approach 1:
The patent segments the single EU TrCH into multiple virtual logical channels by introducing MAC-d flows with different priorities. Each MAC-d flow can be independently controlled and prioritized, allowing QoS differentiation while maintaining the single TrCH structure for radio resource efficiency.
Solution Approach 2:
The patent applies local quality by assigning different priority levels and QoS parameters to different MAC-d flows within the same EU TrCH. This allows specific portions of the data stream (different logical channels) to have different quality characteristics, enabling prioritization of critical data while maintaining overall resource efficiency.
2Loss of time
If TFC selection rules prioritize highest priority data transmission, then transmission latency is reduced, but lower priority data may be blocked during power restrictions
Solution Approach 1:
The patent implements dynamic TFC selection that adapts to power availability and data priority. The system dynamically adjusts which MAC-d flows are transmitted based on current power conditions and priority requirements, ensuring high priority data is transmitted first while lower priority data can be deferred or blocked only when necessary.
Solution Approach 2:
The patent uses feedback mechanisms where the WTRU monitors power availability and data buffer status, then adjusts TFC selection accordingly. The system provides feedback to the network about power restricted conditions and receives updated instructions, enabling reliable transmission by adapting to changing conditions while maintaining priority differentiation.
3Use of energy by moving object
If the WTRU operates in power restricted state, then power consumption is reduced, but data transmission rate decreases and QoS cannot be maintained
Solution Approach 1:
The patent applies partial action by transmitting only the necessary portion of data during power restricted states. Instead of maintaining full transmission rates for all logical channels, the system transmits partial data at reduced power, prioritizing high priority MAC-d flows while allowing lower priority flows to be reduced or blocked, thus maintaining acceptable QoS for critical data while conserving power.
Data Source
AI summary
A method and apparatus for enhanced uplink multiplexing are disclosed. A set of combinations of MAC-d flows (and/or logical channels) that are allowed to be multiplexed within a MAC-e PDU is defined for a WTRU. The WTRU MAC-e entity selects a combination among a set of allowed combinations for multiplexing MAC-d flows for each MAC-e PDU. Certain MAC-d flow combinations may be defined that can not be blocked from transmission even when the WTRU is in a transmit power restricted state. The amount of data from each logical channel or corresponding MAC-d flow that can be multiplexed within a MAC-e PDU may be defined to ensure guaranteed data rates. When the WTRU is in a restricted power condition, an indication of the restricted power condition may be passed to the Node-B with the EU transmission.