HSDPA Channel Allocation Reducing WTRU Power Consumption
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Solution Overview
Problem
The high number of channels required for HSDPA service in wireless communication systems significantly increases power consumption in wireless transmit/receive units (WTRUs), particularly due to the prolonged activation of the radio frequency (RF) part, which affects battery efficiency, especially during sleep mode and frequent transmission pauses.
Innovation Solution
The RNC allocates HSDPA channels such that a WTRU monitors all HS-SCCHs in the same timeslot, minimizes the RF part's on-time by associating HS-SICH with HS-SCCH, and adjusts channel configurations to reduce power consumption by using RRC signaling for flexible allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple HS-SCCH channels are allocated to different timeslots for HSDPA service, then channel diversity and reliability are improved, but RF part activation time increases and power consumption increases
Solution Approach 1:
The patent combines multiple HS-SCCH channels into the same timeslot by allocating them to different code resources (spreading codes) within that single timeslot. This merging approach allows the WTRU to monitor all necessary control channels while keeping the RF part activated for a shorter duration, thereby reducing power consumption compared to spreading channels across multiple timeslots.
Solution Approach 2:
The patent transitions from a time-based distribution of channels to a code-based distribution within the same time resource. By utilizing the code dimension (spreading codes) instead of the time dimension (different timeslots), the system achieves channel diversity without extending the RF activation period, thus resolving the contradiction between reliability and power consumption.
2Reliability
If RF part remains active longer to monitor multiple channels, then channel monitoring reliability is improved, but battery life decreases
Solution Approach 1:
Multiple HS-SCCH channels are merged into a single timeslot allocation, allowing the WTRU to complete monitoring of all necessary control channels within one timeslot duration. This reduces the total time the RF part must remain active, directly preserving battery life while maintaining monitoring reliability through code-based channel separation.
3Adaptability or versatility
If channels are allocated across multiple timeslots, then resource flexibility is improved, but number of activated timeslots increases
Solution Approach 1:
The patent shifts the resource allocation dimension from time (multiple timeslots) to code (multiple spreading codes within one timeslot). This dimensional change allows flexible channel allocation to be achieved without increasing the number of timeslots that must be activated, thus reducing the quantity of time resources consumed.
Data Source
AI summary
A wireless transmit/receive unit includes a receiver and a processor. The receiver is configured to receive a plurality of high-speed shared control channels (HS-SCCHs), wherein the plurality of HS-SCCHs are received over a plurality of discrete time intervals. The processor is configured to instruct the receiver to receive all of the plurality of HS-SCCHs during one of the plurality of discrete time intervals.