Rath Vannithamby

Optimal frequency of Walsh mask broadcast for forward high-speed wireless packet data channels

The 1/spl times/EV-DV 3G wireless network system is able to simultaneously support traditional code division multiplexed voice and circuit-switched data channels in addition to one or two time shared high speed packet data channels. In practice, voice calls will be provided with higher priority than data calls. Therefore, radio resources (e.g., power and Walsh codes) will be first given to voice connections and any unused resources will be dynamically assigned to the high speed packet data channel. Because of Walsh code fragmentation, it may be possible that Walsh codes not being used for voice and circuit-switched data connections cannot be used by the packet data channel. In order to make use of such codes, the Walsh code mask must be broadcast in the sector. Such a broadcast results in increased sector throughput due to the additional Walsh codes available to the forward packet data channel (F-PDCH) but it also requires forward link resources which reduces throughput. We determine the broadcast frequency that optimizes this tradeoff.

Rreverse link high-speed packet data support in cdma2000 1/spl times/EV-DV: upper layer protocols

This article describes the design enhancements of the upper layers of the cdma2000/spl reg/ revision D standards [Mar. 2004] supporting high-speed wireless data on the 1/spl times/EV-DV reverse link. In revision D, the reverse link peak data rate has been increased by an order of magnitude from 153.6 kb/s to 1.8 Mb/s, and the reverse link sector throughput has been improved significantly (from about 280 kb/s to 600 kb/s). The key enabling mechanisms to achieve these enhancements include a hybrid automatic repeat request protocol, adaptive higher order modulation and coding schemes, and advanced radio resource management schemes. It is well known that the reverse link is interference limited, so the system resource of interest is reverse link interference. cdma2000 Revision D introduces a variety of flexible medium access control mechanisms to allocate appropriate reverse link resources for mobile stations with various service requirements. Moreover, cdma2000 revision D greatly enhances quality of service support for the reverse link.

cdma2000 1xEV-DV reverse link performance in the presence of voice users

One of the main design goals of cdma2000 1xEV-DV is the efficient support of packet data services without detriment to existent voice services. This paper investigates the performance of the 1xEV-DV RL in the presence of voice users. In particular, several algorithms are investigated to support the three MAC mechanism defined in the 1xEV-DV standard. The results show that for the common rate control mechanism, the algorithm introduces no cost to mixing voice and data at low voice loads. However with the common rate control mechanism operating with higher voice load or the dedicated rate control and grant based scheduling mechanisms, the mixing of data and voice results in modest loss in performance. The amount of loss varies and is a result of the interplay of incrementally increasing resources for voice service and the ability of the system to target higher system loads as voice load increases. Nevertheless, these results show that 1xEV-DV can efficiently support both voice and packet data traffic.