QoS Guaranteeing during UMTS Packet-domain Handover
We focus on the problem of guaranteeing real-time service quality during the inter-RNS handover/relocation in packet-domain/all-IP UMTS. We propose fully seamless SRNS relocation mechanisms for the Conversational and Streaming services respectively. The multimedia service quality can be guaranteed by packets bi-casting in backbone and radio signal macrodiversity. By adapting and extending the data link protocols GTP-U/PDCP/RLC, we synchronize the packet streams in the new and old backbone routes. For the Streaming class we propose a new RLC mode called No-sequencing Acknowledged RLC, assuring packet lossless delivery and throughput steady during relocation. Our mechanisms are based on existing basic inter-RNS procedure, and could be easily integrated into it. Synchronous multicast/bi-cast requires backbone links to be overprovisioned with bandwidth. In multicast-tree mode, the bandwidth overprovision amount of Iu-PS link is the sum of capacities of the neighbor cells. In multicast-on-demand/bi-cast mode,the bandwidth overprovision amount of Iu-PS link is 2Mbps.There is no need to overprovision the Iur link bandwidth.
multimedia handover UMTS QoS bandwidth overprovisioning bi-casting
SHEN Qingguo SHEN Ruisong WANG Li
Institute of Communications Engineering PLA University of Science and Technology, Nanjing 210016, Ch Institute of Communications Engineering PLA University of Science and Technology, Nanjing 210016, Ch
国际会议
成都
英文
387-390
2003-08-27（万方平台首次上网日期，不代表论文的发表时间）