Abstract
In this paper, we consider a DS-CDMA mobile network supporting real-time and non-real-time services. We study how the delay tolerance of non-real-time traffic can be exploited by allowing both transmission power control and variable spreading gain (transmission rate) control. Two control mechanisms adapt the received energy per bit to the current channel conditions and efficiently manage the multiple access interference so as to optimize performance. We provide the jointly optimal power and spreading gain allocation strategy of non-real-time sources. Our strategy maximizes non-real-time throughput subject to constraints on peak transmission power and protects QoS of real-time-services. We show that under the optimal strategy, the optimal spreading gains are inverse linear in the signal to interference plus noise ratio (SINR), and transmission power is allocated to the non-real-time sources in decreasing order of channel gain according to a greedy control strategy. We also present numerical results comparing the throughput and delay performance of the optimal strategy with other common strategies; the optimal strategy can offer substantial performance gains.
Original language | English |
---|---|
Title of host publication | 1999 IEEE Wireless Communications and Networking Conference, WCNC |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 510-514 |
Number of pages | 5 |
ISBN (Electronic) | 0780356683 |
DOIs | |
Publication status | Published - 1999 |
Externally published | Yes |
Event | 1st IEEE Annual Wireless Communications and Networking Conference, WCNC 1999 - New Orleans, United States Duration: 1999 Sept 21 → 1999 Sept 24 |
Publication series
Name | IEEE Wireless Communications and Networking Conference, WCNC |
---|---|
Volume | 1 |
ISSN (Print) | 1525-3511 |
Other
Other | 1st IEEE Annual Wireless Communications and Networking Conference, WCNC 1999 |
---|---|
Country/Territory | United States |
City | New Orleans |
Period | 99/9/21 → 99/9/24 |
Bibliographical note
Publisher Copyright:© 1999 IEEE.
ASJC Scopus subject areas
- General Engineering