System Requirements for Extended Cell HRPD (xHRPD)

As compared to a HRPD cell, an extended cell is characterized by increased radio path loss between the base station and a user terminal, increased radio path delay between the base station and a user terminal, a larger geographical cell coverage area and highly overlapping coverage with adjacent extended cells. Extended cell HRPD (or xHRPD) is considered as an enhancement to the HRPD standards [2] and [3].
An example of xHRPD application is serving as a component of integrated satellite terrestrial network. The terrestrial network component (e.g., a HRPD cellular network) provides economical and high quality services to areas of high user densities yet its coverage area is geographically limited. On the other hand, the satellite network component, using xHRPD, provides a much broader coverage area and can be used to complement the limited coverage offered by the terrestrial network.
This integrated system can provide“anywhere”and“anytime”type of coverage and allows handsets and data cards with the same form factor as the current commercial (cellular) devices to operate in either satellite or terrestrial mode.
Another potential application of xHRPD is to provide access to telemetry devices located in remote areas. A valuable role of xHRPD is envisioned in case of natural or man-made disasters, when terrestrial networks could suffer damage. A satellite based xHRPD system can supplement coverage and serve as a backup system for ordinary users, as well as disaster recovery personnel.
The terms and abbreviations which are used within this specification are defined as follows:
ARQ Automatic Repeat Request
EIRP Effective Isotropic Radiated Power
EVRC Enhanced Variable Rate Codec
G/T Ratio of antenna gain over equivalent system noise temperature