Uplink Packet Data Channel Detection via PICH Parameter Extraction
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Solution Overview
Problem
The existing 3GPP2 CDMA2000-1x EVDV standards rely heavily on the PDCCH for uplink capacity, leading to interference and reduced capacity due to the need for high PDCCH power levels, which results in increased latency and errors in detecting the PDCH at the base station.
Innovation Solution
The solution reduces reliance on PDCCH by using different discrete values for parameters like SPID, data packet size, and PDCH-to-PICH power ratio, allowing detection of PDCH based on all supported combinations, eliminating the need for PDCCH in processing and setting its power to zero, thereby minimizing interference and enhancing uplink capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high PDCCH power levels are used to ensure reliable detection, then detection reliability is improved, but interference increases and uplink capacity decreases
Solution Approach 1:
The patent extracts the critical control information from the PDCCH and relocates it to the PICH. By removing the PDCCH's essential function (carrying packet size, SPID, and power ratio indications), the system eliminates the need for high PDCCH power levels, thereby reducing interference while maintaining detection reliability through the PICH-based approach
Solution Approach 2:
The PICH serves as an intermediary carrier for the control information that was previously transmitted via PDCCH. The base station uses the PICH to convey packet size, SPID, and PDCH-to-PICH power ratio indications, allowing reliable control signal transmission without requiring high power levels that would cause interference
2Reliability
If high PDCCH power levels are used to ensure reliable detection, then detection reliability is improved, but uplink capacity decreases
Solution Approach 1:
The patent extracts the control information function from the PDCCH and implements it through the PICH. This extraction eliminates the need for high PDCCH power transmission, freeing up uplink capacity for data transmission while maintaining reliable control signal delivery through the PICH
Solution Approach 2:
The patent changes the transmission parameter approach by using the PICH with different discrete power levels instead of high-power PDCCH transmission. The base station transmits control information at appropriate PICH power levels, which are sufficient for reliable detection without consuming excessive uplink capacity
3Measurement precision
If PDCCH is used for parameter transmission, then detection accuracy is improved, but latency increases
Solution Approach 1:
The patent extracts the parameter transmission function from the PDCCH and relocates it to the PICH. This extraction streamlines the detection process by eliminating the need to process high-power PDCCH signals, thereby reducing latency while maintaining accurate parameter detection through the PICH
Solution Approach 2:
The patent skips the high-power PDCCH transmission step entirely and proceeds directly to PICH-based parameter transmission. This skipping of the PDCCH processing stage reduces the time required for parameter detection while maintaining accuracy through the alternative PICH transmission path
Data Source
AI summary
At a base station receiver in a CDMA wireless communications system, in order to reduce reliance on the parameter values transmitted on a packet data control channel (PDCCH) to properly detect the high speed packet data transmitted on a packet data channel (PDCH) with which the PDCCH is code-division-multiplexed, data detection is performed using different possible values for at least one of the parameters and determining if a data packet derived from the PDCH detected under the different values produces a detected data packet that passes a CRC check. If a data packet derived from the received PDCH using a possible parameter value passes the CRC check, then the data packet is delivered to the output and an ACK is transmitted back to the transmitting mobile terminal.