Receiver AGC Adjustment for Sleep-Wake Signal Block Reception
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Solution Overview
Problem
Existing automatic gain control (AGC) methods in wireless communication systems are not power efficient and may not be applicable in scenarios with quasi-co-location of synchronization signal blocks (SSBs) and paging occasions (POs).
Innovation Solution
A method for signal block reception with AGC in wireless communication systems, where the receiver switches from a sleep mode to an active mode for continuous reception of signal blocks. The method involves receiving a first set of samples, determining an applicable AGC setting, and receiving a second set of samples using this setting, thereby optimizing power efficiency and AGC accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiver wakes up early to determine AGC setting based on a signal block, then AGC accuracy is improved, but power consumption increases due to unnecessary wake-ups
Solution Approach 1:
The receiver performs preliminary AGC setting determination by waking up before the signal block to acquire the AGC parameter, then uses this pre-determined setting during the actual signal block reception. This preliminary action allows the receiver to return to sleep mode sooner, reducing overall power consumption while maintaining AGC accuracy.
Solution Approach 2:
The signal block reception process is segmented into distinct phases: AGC setting determination phase (first part of signal block) and main reception phase (second part of signal block). The receiver wakes up only for the AGC determination phase, then returns to sleep mode, and wakes up again only when needed for the main reception phase, thereby reducing unnecessary wake-ups and power consumption.
2Reliability
If the receiver remains in active mode for continuous reception, then signal reception reliability is improved, but power efficiency deteriorates
Solution Approach 1:
The receiver operates in periodic cycles, alternating between active mode (for AGC determination and signal reception) and sleep mode (for power saving). By using the pre-determined AGC setting, the receiver can efficiently switch between these states without compromising reception reliability, thus improving power efficiency.
Solution Approach 2:
The AGC setting is determined in advance during a brief wake-up period before the actual signal reception. This preliminary action ensures that when the receiver does wake up for signal reception, it can do so reliably with the correct AGC setting already in place, minimizing the duration of active mode and improving power efficiency.
3Use of energy by moving object
If the receiver uses a previous AGC setting from a prior signal block, then power consumption is reduced, but AGC accuracy may deteriorate due to signal conditions changing
Solution Approach 1:
The receiver determines the AGC setting by analyzing the actual received signal block, which provides feedback on the current signal conditions. This feedback mechanism ensures that the AGC setting accurately reflects the present signal environment, maintaining AGC accuracy while still enabling power-saving operations by using this setting for subsequent receptions under similar conditions.
Solution Approach 2:
The receiver performs a brief wake-up to determine the AGC setting based on the current signal block before returning to sleep mode. This preliminary determination ensures the AGC setting is accurate for current conditions, and this setting is then reused for subsequent signal blocks, balancing power consumption with accuracy.
Data Source
AI summary
A method of signal block reception with automatic gain control (AGC) for a receiver is disclosed. The receiver is configured for at least a sleep mode and an active mode. The signal blocks are non-adjacent in time, and each signal block is configured to be received in entirety using a valid AGC setting determined based on a previous signal block. The method comprises, when switching from the sleep mode to the active mode for continuous reception of a signal block, receiving a first set of samples of the signal block, determining an applicable AGC setting based on the first set of samples of the signal block, and receiving a second set of samples of the signal block using the applicable AGC setting determined based on the first set of samples. Corresponding apparatus, receiver, wireless communication device and computer program product are also disclosed.