Abstract: Two algorithms for different functional-split network models are provided, which are the CU-based (central unit based) beam allocation and admission control algorithm (CU-BAACA) and the DU-based (distributed unit based) beam allocation and admission control algorithm (DU-BAACA). Difference between the CU-BAACA and DU-BAACA includes whether the algorithm is implemented at the CU site or at the DU site. Proposed algorithms aim to optimize DUs' quality of experience (QoE) by admission control to determine the amount of data from application layer entering into traffic queue and allocating beam in physical layer at the fronthaul network between CU and DUs. On the other hand, queueing delay and queue stability are taken into consideration to maintain the system steadiness. Simulation results compare performance of two functional split models to find the appropriate scenario for each function split option, which provide technical requirement and applicability of the proposed algorithms for practical system.

Abstract: Two algorithms for different functional-split network models are provided, which are the CU-based (central unit based) beam allocation and admission control algorithm (CU-BAACA) and the DU-based (distributed unit based) beam allocation and admission control algorithm (DU-BAACA). Difference between the CU-BAACA and DU-BAACA includes whether the algorithm is implemented at the CU site or at the DU site. Proposed algorithms aim to optimize DUs' quality of experience (QoE) by admission control to determine the amount of data from application layer entering into traffic queue and allocating beam in physical layer at the fronthaul network between CU and DUs. On the other hand, queueing delay and queue stability are taken into consideration to maintain the system steadiness. Simulation results compare performance of two functional split models to find the appropriate scenario for each function split option, which provide technical requirement and applicability of the proposed algorithms for practical system.

Abstract: A speaker set configured for a portable electronic device includes a hollow shell, a back cover, and a loudspeaker sandwiched between the shell of the back cover. The shell includes a first chamber, a second chamber, a third chamber and a fourth chamber. The second and third chambers are positioned at opposite sides of the first chamber, and communicate with a surrounding environment at opposite sides of the shell. The loudspeaker is accommodated in the first chamber, and divides the first chamber into a front sub-chamber and a rear sub-chamber. The front sub-chamber communicates with the second and the third chambers thereby forming a front resonance chamber. The rear sub-chamber communicates with the fourth chamber thereby forming a rear resonance chamber. Sound waves generated from the loudspeaker are transmitted to and resonate in the front and rear resonance chambers and then transmitted to the surrounding environment in opposite directions.

Abstract: A speaker set includes a hollow shell, a back cover, and a loudspeaker. The shell includes at least one partition wall dividing an inner space of the shell into a first chamber, a second chamber, and a third chamber. The loudspeaker is packaged between the shell and the back cover. The loudspeaker is accommodated in the first chamber, and divides the first chamber into a front sub-chamber and a rear sub-chamber. The front and rear sub-chambers respectively communicate with the second and third chambers thereby forming a front resonance chamber and a rear resonance chamber respectively. The loudspeaker has a plurality of front tone holes and a plurality of rear tone holes respectively communicating with the front sub-chamber and the rear sub-chamber. The front resonance chamber communicates with a surrounding environment so that sound waves emanating from the front tone holes can be transmitted to the surrounding environment.

Abstract: A speaker set configured for a portable electronic device includes a hollow shell, a back cover, and a loudspeaker sandwiched between the shell of the back cover. The shell includes a first chamber, a second chamber, a third chamber and a fourth chamber. The second and third chambers are positioned at opposite sides of the first chamber, and communicate with a surrounding environment at opposite sides of the shell. The loudspeaker is accommodated in the first chamber, and divides the first chamber into a front sub-chamber and a rear sub-chamber. The front sub-chamber communicates with the second and the third chambers thereby forming a front resonance chamber. The rear sub-chamber communicates with the fourth chamber thereby forming a rear resonance chamber. Sound waves generated from the loudspeaker are transmitted to and resonate in the front and rear resonance chambers and then transmitted to the surrounding environment in opposite directions.