Title :
OVSF code channel assignment for IMT-2000
Author :
Cheng, Ray-Guang ; Lin, Phone
Author_Institution :
Adv. Technol. Center, Ind. Technol. Res. Inst., Hsinchu, Taiwan
Abstract :
Code channel assignment deals with the problem that how different codes are allocated to different connections. In the 3GPP technical specifications, the channelization codes used for spreading are orthogonal variable spreading factor (OVSF) codes. It can preserve the orthogonality between user´s physical channels. OVSF codes are valuable resources in CDMA systems and should be properly managed. The objective of this paper is to find a code channel assignment method to support as many users as possible with less complexity. We proposed a code channel assignment method for user equipment (UE) that has the capability to support multi-rate services using multi-code transmission. A single table is used to allocate codes to a UE according to its requested data rate. Therefore, the allocation and releasing procedures, which can be accomplished in a very short period of time, are efficient
Keywords :
channel allocation; code division multiple access; land mobile radio; multiuser channels; spread spectrum communication; 3GPP technical specifications; DS-CDMA systems; IMT-2000; OVSF code channel assignment; QoS; allocation procedure; channelization codes; data rate; discrete event simulation model; mobile radio; multi-code transmission; multi-rate services; orthogonal variable spreading factor codes; physical channels; releasing procedure; spreading code; user equipment; Communication industry; Computer industry; Computer science; Frequency; Interference; Modulation coding; Multiaccess communication; Optimization; Quality of service; Resource management;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851660
