Access Node Scheduling for Wireless Terminal Devices
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Solution Overview
Problem
In wireless communication systems, especially in Bandwidth-reduced low-complexity or coverage enhanced (BL/CE) designs, scheduling transmissions for terminal devices often results in delays and resource waste due to collisions with measurement gaps, which are unavoidable when high repetition numbers are used, leading to transmission failures and retransmissions.
Innovation Solution
An access network node determines whether control channels have no collision with measurement gaps and traffic channels have collisions, allowing for an increased repetition number of the traffic channel to avoid delays and reduce retransmissions by accepting collisions between the traffic channel and measurement gaps, thus minimizing resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high repetition number is used for traffic channel transmission to improve coverage and signal reliability, then transmission reliability is improved, but collisions with measurement gaps occur causing transmission delays and resource waste
Solution Approach 1:
The patent applies local quality by differentiating the treatment of control channels and traffic channels. Control channels (MPDCCH, PUCCH) are scheduled to avoid measurement gaps completely, while traffic channels (PDSCH, PUSCH) are allowed to collide with measurement gaps. This localized differentiation resolves the contradiction by protecting critical control signaling from delays while accepting that traffic data may experience gaps, thereby maintaining transmission reliability for control while minimizing overall system delay.
Solution Approach 2:
The patent segments the scheduling decision into two independent parts: control channel scheduling and traffic channel scheduling. The access network node separately determines repetition numbers for control channels (avoiding measurement gaps) and traffic channels (allowing collisions). This segmentation allows each channel type to be optimized independently, resolving the contradiction between reliability and delay by applying different strategies to different segments of the transmission system.
2Reliability
If a high repetition number is used for traffic channel transmission to improve coverage, then coverage enhancement is achieved, but resource waste occurs due to retransmissions caused by measurement gap collisions
Solution Approach 1:
The patent applies local quality by differentiating the treatment of control channels and traffic channels. Control channels (MPDCCH, PUCCH) are scheduled to avoid measurement gaps completely, while traffic channels (PDSCH, PUSCH) are allowed to collide with measurement gaps. This localized differentiation resolves the contradiction by protecting critical control signaling from delays while accepting that traffic data may experience gaps, thereby maintaining transmission reliability for control while minimizing overall system delay.
Solution Approach 2:
The patent segments the scheduling decision into two independent parts: control channel scheduling and traffic channel scheduling. The access network node separately determines repetition numbers for control channels (avoiding measurement gaps) and traffic channels (allowing collisions). This segmentation allows each channel type to be optimized independently, resolving the contradiction between reliability and delay by applying different strategies to different segments of the transmission system.
3Loss of time
If the repetition number of traffic channel is increased to avoid collision with measurement gap, then transmission delay is reduced, but resource efficiency decreases due to excessive repetitions
Solution Approach 1:
The patent applies local quality by differentiating the treatment of control channels and traffic channels. Control channels (MPDCCH, PUCCH) are scheduled to avoid measurement gaps completely, while traffic channels (PDSCH, PUSCH) are allowed to collide with measurement gaps. This localized differentiation resolves the contradiction by protecting critical control signaling from delays while accepting that traffic data may experience gaps, thereby maintaining transmission reliability for control while minimizing overall system delay.
Solution Approach 2:
The patent applies partial action by allowing only the necessary minimum repetitions for traffic channels to occur, accepting that some will collide with measurement gaps. Rather than increasing repetitions excessively to avoid all gaps, the system uses just enough repetitions to maintain coverage, letting measurement gaps naturally filter out redundant transmissions. This resolves the contradiction by avoiding excessive resource consumption while preventing unnecessary delays.
Data Source
AI summary
A method and an access network node are disclosed for scheduling transmission for terminal device. According to an embodiment, the access network node determines, for a transmission to be scheduled for a terminal device, whether one or more control channels required by the transmission have no collision with measurement gap and a traffic channel required by the transmission has collision with a measurement gap, based on current repetition number of the traffic channel. When determining that the one or more control channels have no collision with measurement gap and the traffic channel has collision with a measurement gap, the access network node determines a second repetition number of the traffic channel that is larger than the current repetition number of the traffic channel. The access network node schedules the transmission for the terminal device based on the second repetition number.