Terminal CQI Transmission Handling Forced Termination
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Solution Overview
Problem
In mobile communication systems, particularly in LTE, there is a challenge in reducing power consumption and complexity while maintaining appropriate processing capability during discontinuous reception, where abrupt termination of active time can lead to issues like double decoding and inefficient CSI/SRS transmission.
Innovation Solution
The method involves detecting forced termination in a terminal's active time and scheduling Channel Quality Indicator (CQI) transmission on Physical Uplink Control Channel (PUCCH) at a subsequent subframe, without configuring HARQ feedback or Physical Uplink Shared Channel (PUSCH) at that subframe, to minimize power consumption and avoid double decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal maintains high processing capability during discontinuous reception to handle forced termination, then reliability is improved, but power consumption increases
Solution Approach 1:
The terminal dynamically adjusts its processing capability based on the detection of forced termination events. During normal discontinuous reception, the terminal operates with reduced processing capability to save power. When forced termination is detected, the terminal activates enhanced processing capability temporarily to handle the termination and transmit CQI properly, then returns to the lower power state.
Solution Approach 2:
The invention changes the operational parameters of the terminal by introducing a detection mechanism for forced termination. Upon detection, the terminal changes its transmission behavior by sending CQI on PUCCH at a specifically determined subframe, rather than following the standard discontinuous reception pattern. This parameter change allows reliable handling of forced termination while controlling overall power consumption.
2Reliability
If the terminal increases processing capability to handle abrupt termination, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention extracts the forced termination handling functionality as a separate, dedicated mechanism. Rather than requiring the terminal to maintain continuously high processing capability for all operations, the system isolates the forced termination detection and CQI transmission as specific, triggered operations. This extraction allows the terminal to maintain simple discontinuous reception operation normally while adding only the necessary complexity for handling forced termination events.
3Productivity
If CQI transmission is scheduled at the first subframe of forced termination, then productivity is improved, but harmful factors increase due to double decoding
Solution Approach 1:
The invention applies preliminary action by determining the CQI transmission subframe in advance, specifically selecting a subframe that is offset from the forced termination subframe. This preliminary determination prevents the double decoding problem by ensuring that CQI transmission does not occur at a time when the eNodeB might be performing initial decoding operations. The terminal calculates the appropriate subframe based on the forced termination detection, then transmits CQI at that predetermined time.
Data Source
AI summary
The present invention pertains to a method and device for transmitting a control signal, and a method for a terminal to transmit a control signal according to one embodiment of the present invention can comprise: a step for sensing a forced termination in a first subframe during active time; and a step in which if the forced termination is sensed and if, in a second subframe among a pre-set number of subframes after the first subframe, Channel Quality Indicator (CQI) transmission via a Physical Uplink Control Channel (PUCCH) is set, and if neither one among Hybrid Automatic Repeat Request (HARQ) feedback transmission and Physical Uplink Shared Channel (PUSCH) transmission is set in the second subframe, the CQI transmission is executed via the PUCCH. The embodiment of the present invention enables power consumption by the terminal to be reduced.