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This paper addresses the radio resource management (RRIM) structure and efficient dynamic capacity allocation techniques for hybrid TDMA/CDMA mobile cellular networks to support multimedia services with different quality-of-service (QoS) requirements in an interference-limited environment. Based on the received interference information, the minimum instantaneous power (MIP) algorithm aims to assign timeslot-codes that minimize the required transmitted power to maintain a target SINR. However, the MIP, being distributed, does not make any attempt to avoid generation of interference elsewhere across the network. Aiming to reduce both potentially received and generated interference in timeslot-code assignment, the proposed minimum sum of path-loss ratio (MS-PLR) algorithm incorporates the mutual large-scale path-loss ratios between different active mobiles in the cost function of a given timeslot during assignment. Simulation results for various traffic scenarios are used for performance evaluation and comparison. It is shown that MS-PLR can offer an additional capacity increase of 24% over MIP. The impacts of bursty WWW traffic on speech performance are also examined.