Multicode Multirate Compact Assignment of OVSF Codes for QoS Differentiated Terminals

Yang, Yang; Yum, T.-S.P.

doi:10.1007/978-3-540-30199-8_30

Cited by 3 publications

(5 citation statements)

References 14 publications

(26 reference statements)

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“…The single code assignment methods allocate only one code to a user. The multirate multicode compact assignment [9] scheme uses the concept of compact index to accommodate users with differentiated QoS requirements. The multicode assignment can support multirate services using multiple codes with multiple rake combiners.…”

Section: Existing Ovsf Code Assignment Designsmentioning

confidence: 99%

“…This is carried out by using the most crowded portion of the tree for a new call. The multirate multicode compact assignment [15] scheme uses the concept of compact index to accommodate users with differentiated QoS requirements. The DCA scheme requires extra information to be transmitted to inform the receiver about code reassignments.…”

Section: Existing Ovsf Code Assignment Designsmentioning

confidence: 99%

“…If the service time for the l th class is 1= l , l 2 OE1, 16, the traffic load for class l is l D l = l . Furthermore, the throughput of the proposed design is compared with the existing designs in Figure 7 for the distribution [15,15,35,35]. The new users are divided into four rate groups R 4R, 5R 8R, 9R 12R, 13R 16R.…”

Section: Scenario Imentioning

confidence: 99%

“…Comparison of wastage capacity for various designs when the users rate varying from R to 64R (a) For distribution[15,15,35,35], (b) For distribution[35,35,15,15].…”

mentioning

confidence: 99%

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Reducing code wastage in orthogonal variable spreading factor‐based wideband code division multiple access networks

Saini

Gupta

Joshi

2011

Int J Communication

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Most third-generation and beyond wideband code division multiple access networks use the orthogonal variable spreading factor code tree for channelization codes. The codes in this code tree are limited and the performance of a wireless network depends upon the code assignment for new calls. In this paper, we introduce a term called 'wastage capacity', which gives us the amount of wastage caused when a code (single or multiple) with a data rate higher than the rate of the incoming call is assigned to it. We suggest two methods to keep wastage capacity below an arbitrary threshold value or zero. In the first method, we devised an algorithm in which wastage up to a certain threshold would be tolerated and the minimum rakes to get this wastage capacity were identified. In the second approach, we reduced the wastage capacity to zero irrespective of the number of rakes at the expense of higher cost and complexity.

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Section: Existing Ovsf Code Assignment Designsmentioning

confidence: 99%

Section: Existing Ovsf Code Assignment Designsmentioning

confidence: 99%

Section: Scenario Imentioning

confidence: 99%

“…Comparison of wastage capacity for various designs when the users rate varying from R to 64R (a) For distribution[15,15,35,35], (b) For distribution[35,35,15,15].…”

mentioning

confidence: 99%

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Reducing code wastage in orthogonal variable spreading factor‐based wideband code division multiple access networks

Saini

Gupta

Joshi

2011

Int J Communication

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show abstract

“…The optimum multi code combination is chosen out of a set of multi code options. The multicode multirate compact assignment (MMCA) [12] is based on the concept of compact index, where the objective is to keep the remaining candidate codes in the most compact state after each code assignment without rearranging codes. This can be achieved by finding the candidate codes in the most crowded positions for newly arrived calls and data packets.…”

Section: Related Workmentioning

confidence: 99%