Abstract
Abstract High speed downlink packet access (HSDPA) has been successfully applied in commercial systems and improves user experience significantly. However, it incurs substantial energy consumption. In this article, we address this issue by proposing a novel energy efficient semi-static power control and link adaptation scheme in HSDPA. Through estimating the EE under different modulation and coding schemes (MCSs) and corresponding transmit power, the proposed scheme can determine the most energy efficient MCS level and transmit power at the Node B. And then the Node B configures the optimal MCS level and transmit power. In order to decrease the signaling overhead caused by the configuration, a dual trigger mechanism is employed. After that, we extend the proposed scheme to the multiple input multiple output (MIMO) scenarios. Simulation results confirm the significant EE improvement of our proposed scheme. Finally, we give a discussion on the potential EE gain and challenge of the energy efficient mode switching between single input multiple output (SIMO) and MIMO configuration in HSDPA.
Highlights
How to acquire higher throughput with lower power consumption has become an important challenge for the future wireless communication systems [1]
Extension to multiple input multiple output (MIMO) system As the MIMO technique called dual stream transmit adaptive antennas (D-TxAA) can be applied in High speed downlink packet access (HSDPA), we propose a modified power control and link adaptation scheme which is applicable to MIMO HSDPA systems
Simulation results we evaluate the performance of the proposed algorithm in different scenarios and give some discussions on mode switching between MIMO and single input multiple output (SIMO) configuration along with our proposed scheme according to HSDPA link level simulation results
Summary
How to acquire higher throughput with lower power consumption has become an important challenge for the future wireless communication systems [1]. According to [3], HSDPA has introduced a new downlink physical channel called high speed physical downlink shared channel (HS-PDSCH), and some new features such as adaptive modulation and coding scheme (AMC), hybrid automatic repeat request (HARQ), fast scheduling and multiple input multiple output (MIMO) It improves the downlink peak data rate and system throughput greatly. A power model including dynamic circuit power related with antenna number is taken into account Based on this model, we propose a practical semi-static joint power control and link adaptation method to improve EE, while guaranteeing the users’ transmission rate constraints.
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