Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks
Orthogonal variable spreading factor codes are used in the downlink to maintain the orthogonality between different channels and are used to handle new calls arriving in the system. A period of operation leads to fragmentation of vacant codes. This leads to code blocking problem. The assignment sche...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2014-08-01
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| Series: | The Journal of Engineering |
| Subjects: | |
| Online Access: | http://digital-library.theiet.org/content/journals/10.1049/joe.2014.0149 |
| _version_ | 1818434715849326592 |
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| author | Vipin Balyan Davinder S Saini Ankit Mehta |
| author_facet | Vipin Balyan Davinder S Saini Ankit Mehta |
| author_sort | Vipin Balyan |
| collection | DOAJ |
| description | Orthogonal variable spreading factor codes are used in the downlink to maintain the orthogonality between different channels and are used to handle new calls arriving in the system. A period of operation leads to fragmentation of vacant codes. This leads to code blocking problem. The assignment scheme proposed in this paper is not affected by fragmentation, as the fragmentation is generated by the scheme itself. In this scheme, the code tree is divided into groups whose capacity is fixed and numbers of members (codes) are variable. A group with maximum number of busy members is used for assignment, this leads to fragmentation of busy groups around code tree and compactness within group. The proposed scheme is well evaluated and compared with other schemes using parameters like code blocking probability and call establishment delay. Through simulations it has been demonstrated that the proposed scheme not only adequately reduces code blocking probability, but also requires significantly less time before assignment to locate a vacant code for assignment, which makes it suitable for the real-time calls. |
| first_indexed | 2024-12-14T16:41:24Z |
| format | Article |
| id | doaj.art-75afdd4bc5b7496582407347ca5252b2 |
| institution | Directory Open Access Journal |
| issn | 2051-3305 |
| language | English |
| last_indexed | 2024-12-14T16:41:24Z |
| publishDate | 2014-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Journal of Engineering |
| spelling | doaj.art-75afdd4bc5b7496582407347ca5252b22022-12-21T22:54:19ZengWileyThe Journal of Engineering2051-33052014-08-0110.1049/joe.2014.0149JOE.2014.0149Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networksVipin Balyan0Davinder S Saini1Ankit Mehta2Jaypee Institute of Information TechnologyJaypee University of Information TechnologyJaypee Institute of Information TechnologyOrthogonal variable spreading factor codes are used in the downlink to maintain the orthogonality between different channels and are used to handle new calls arriving in the system. A period of operation leads to fragmentation of vacant codes. This leads to code blocking problem. The assignment scheme proposed in this paper is not affected by fragmentation, as the fragmentation is generated by the scheme itself. In this scheme, the code tree is divided into groups whose capacity is fixed and numbers of members (codes) are variable. A group with maximum number of busy members is used for assignment, this leads to fragmentation of busy groups around code tree and compactness within group. The proposed scheme is well evaluated and compared with other schemes using parameters like code blocking probability and call establishment delay. Through simulations it has been demonstrated that the proposed scheme not only adequately reduces code blocking probability, but also requires significantly less time before assignment to locate a vacant code for assignment, which makes it suitable for the real-time calls.http://digital-library.theiet.org/content/journals/10.1049/joe.2014.0149code division multiple accesswireless channelsprobabilityfixed capacityvariable member grouping assignmentorthogonal variable spreading factor code treecode division multiple access networkscode blocking problemcode treecode blocking probabilitycall establishment delay |
| spellingShingle | Vipin Balyan Davinder S Saini Ankit Mehta Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks The Journal of Engineering code division multiple access wireless channels probability fixed capacity variable member grouping assignment orthogonal variable spreading factor code tree code division multiple access networks code blocking problem code tree code blocking probability call establishment delay |
| title | Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks |
| title_full | Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks |
| title_fullStr | Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks |
| title_full_unstemmed | Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks |
| title_short | Fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks |
| title_sort | fixed capacity and variable member grouping assignment of orthogonal variable spreading factor code tree for code division multiple access networks |
| topic | code division multiple access wireless channels probability fixed capacity variable member grouping assignment orthogonal variable spreading factor code tree code division multiple access networks code blocking problem code tree code blocking probability call establishment delay |
| url | http://digital-library.theiet.org/content/journals/10.1049/joe.2014.0149 |
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