HSDPA Scheduled Pilot Channel Activation for MIMO Estimation
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Solution Overview
Problem
Legacy user equipments (UEs) experience increased inter-channel interference due to higher order MIMO transmission schemes, while next-generation UEs require more accurate channel estimation, which is not adequately provided by low-transmit power common pilots without increasing interference to legacy UEs.
Innovation Solution
The method involves transmitting scheduled pilot channels concurrently with common pilots to next-generation UEs, with power allocation allowing for selective activation and deactivation based on network conditions and user equipment requirements, using HS-SCCH orders for signaling to manage pilot channel transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple common pilots are transmitted at high power to improve higher order MIMO channel estimation for next-generation UEs, then channel estimation accuracy is improved, but inter-channel interference to legacy UEs increases
Solution Approach 1:
The patent segments the pilot channel transmission into two distinct types: common pilots (transmitted at low power for legacy UE compatibility) and scheduled pilots (transmitted at higher power specifically for next-generation UEs requiring higher order MIMO). This segmentation allows each pilot type to serve its specific function without compromising the other, resolving the contradiction between channel estimation accuracy and interference to legacy UEs.
Solution Approach 2:
The patent applies local quality by transmitting scheduled pilots with enhanced power and quality specifically targeted at next-generation UEs that require higher order MIMO channel estimation, while maintaining common pilots at low power levels that do not interfere with legacy UEs. The scheduled pilots are transmitted only to locations and times where next-generation UEs are present and need enhanced channel estimation.
2Object-affected harmful factors
If multiple common pilots are transmitted at low power to reduce interference to legacy UEs, then inter-channel interference is minimized, but channel estimation accuracy for next-generation UEs deteriorates
Solution Approach 1:
The patent segments the pilot transmission function by introducing scheduled pilots as a separate mechanism from common pilots. While common pilots maintain low power to protect legacy UEs, scheduled pilots provide the additional channel estimation accuracy needed by next-generation UEs through selective transmission triggered by HS-SCCH orders.
Solution Approach 2:
The network controller sends HS-SCCH orders in advance to activate scheduled pilot transmission before next-generation UEs require enhanced channel estimation. This preliminary action ensures that scheduled pilots are transmitted at the right time and frequency to provide accurate channel estimation without requiring continuous high-power common pilot transmission.
3Measurement precision
If scheduled pilot channels are continuously transmitted to ensure accurate channel estimation for next-generation UEs, then channel estimation accuracy is improved, but network resource consumption increases
Solution Approach 1:
The patent implements periodic action by transmitting scheduled pilots only when needed, triggered by HS-SCCH orders from the network controller. Rather than continuous transmission, scheduled pilots are activated periodically or on-demand based on network conditions and next-generation UE requirements, reducing unnecessary energy consumption while maintaining channel estimation accuracy when required.
Solution Approach 2:
The patent applies dynamics by making scheduled pilot transmission configurable and controllable through HS-SCCH orders. The network controller can dynamically adjust the transmission of scheduled pilots based on real-time network conditions, UE capabilities, and service requirements, optimizing the balance between channel estimation accuracy and resource consumption.
Data Source
AI summary
Transitioning from basic higher order MIMO estimation to enhanced higher order MIMO estimation (and vice-versa) can be accomplished through the signaling of high-speed downlink packet access (HSDPA) shared control channel (HS-SCCH) orders to next-generation user equipments (UEs). A base station can be configured to send an HS-SCCH order indicating activation of scheduled pilot channels, and then begin transmitting the scheduled pilot channels after receiving an ACK message from at least one next-generation UE. A base station can also be configured to send an HS-SCCH order indicating de-activation of scheduled pilot channels to next-generation UEs scheduled for downlink transmission, and then stop transmitting the scheduled pilot channels after receiving ACK messages from each next-generation UE. Alternatively, scheduled pilot channels may be activated/de-activated upon expiration of a timeout period, even without receiving an ACK message from some or all of the next-generation UEs scheduled for downlink transmission.