| 摘要(英) |
The wireless broadband network technologies have been evolved rapidly to satisfy people’s requirement for the access anytime and anywhere. In order to support more users to share the wireless network resources and to maintain Quality of Service (QoS) of existing users, the Radio admission control (RAC) is an important issue toward effective resource utilization.
This study adopts virtual partitioning (VP) model to allocate radio resource to divide multiclass services into several groups according to connection characteristics. These groups include the most conservative to the most positive types. By using preemption method to preempt other group’s resource, operators could promote the opportunity of specific services
to build up bearer successfully according to their requirements and then increase resource
utilization. To avoid eNB accepts too many bearers result in some exiting bearers could not satisfy QoS when their channel condition is downgraded, we propose a resource reservation method to achieve it. The proposed scheme considers the channel conditions of existing bearers and their QoS, to adjust resource reservation. And whether the new bearer can be admitted or not is decided by the calculated residual bandwidth. Furthermore, in addition to maintaining the minimum rate of the bearer, the proposed also estimates the effective residual bandwidth to allocate extra bandwidth for better transmission services.
Exhaustive simulations were performed to examine the effectiveness of the proposed scheme in blocking rate, dropping rate, allocated bandwidth, etc.. And simulation results show that the proposed scheme illustrate good performance.
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| 參考文獻 |
[1] 3GPP TR 25.913. Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN
(E-UTRAN)
[2] 3GPP TS 36.300. Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved
Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2
[3] 3GPP TS 23.401. General Packet Radio Service (GPRS) enhancements for Evolved
Universal Terrestrial Radio Access Network (E-UTRAN) access
[4] 3GPP TS 36.211. Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
Channels and Modulation
[5] 3GPP TS 36.101. Evolved Universal Terrestrial Radio Access (E-UTRA); User
Equipment (UE) radio transmission and reception
[6] 3GPP TS 36.213. Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures
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[15]3GPP TR 25.892. Feasibility Study for Orthogonal Frequency Division Multiplexing
(OFDM) for UTRAN enhancement
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