| 摘要 |
<p>The present invention pertains to improved communication quality and security of transmission in cellular communication networks (10) and the like. A customer has the option to pay different fees for different tiers of service relating to voice quality, bandwidth access, and different tiers of service relating to security of his/her communications (S102). Higher service tiers may guarantee that a specific vocoder or bit rate is used; they also guarantee that a specific encryption protocol is use to ensure secure communications (822). Different tiers may be associated with customers' records (208) for billing purposes. The network (200) may also afford high end cellular phones higher voice quality and/or security by comparing a given high end phone to a look up table (FIG. 6), which indicates what level of service is associated with the given phone. A calling mobile station (312) or a receiving mobile station (302) may negotiate with the other mobile station to change to a more robust vocoder (410) or bit rate(S508) to ensure a higher quality and/or security of communication. Furthermore, the user may also opt to change the quality and/or security level before or during a call.</p> |
