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Distribution method of orthogonal variable bandspread factor code

A technology of spreading factor and distribution method, applied in the field of telecommunications, to achieve the effect of reducing production cost and operating cost, improving service response speed, and reducing operational complexity

Inactive Publication Date: 2004-02-25
INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2. Complexity: Considering complexity, the number of codes allocated to a certain UE should be as small as possible

Method used

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  • Distribution method of orthogonal variable bandspread factor code

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Experimental program
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Embodiment Construction

[0044] The following is an embodiment of the present invention applied in the radio network controller (RNC) equipment of the WCDMA third-generation mobile communication system. The RNC equipment is the entity responsible for OVSF code allocation in the WCDMA system. In the WCDMA system, the SF value of the OVSF code ranges from 4 to 512, and there are 8 SF levels in total.

[0045] Assuming that in the following embodiment, the UE's multi-code capability is 3, and the requested rate weight B is 16, the number of explicitly available codes at each SF level in the system before code allocation is as follows: a 0 = 5, a 1 = 0, a 2 = 0, a 3 = 5, a 4 = 4, a 5 = 3, a 6 = 2, a 7 =1, their corresponding SFs are 512, 256, 128, 64, 32, 16, 8 and 4, respectively.

[0046] The code allocation process of this embodiment is as follows:

[0047] Yardage Budget First: Initialize Season X 0 =B=16. (1) at first be the number of codes corresponding to the budget SF=512: due to X 0 >a...

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Abstract

The present invention provides a distribution method of orthogonal variable band-spreading factor (OVSF) code. The invented code distribution process is implemented under the condition of that the explicit usable code amount of every SF stage in the system in known, and said code distribution process is formed from code amount budget and code amount judgement. Said code amount budget is used for budgting and distributing code amount stage-by-stage (from son stage to father stage) according to the order to SF values from large to small value to find a "quasi-proper" code amount sequence whose rate weight can meet requirements, and the code amount judgement is used for obtaining "most proper" code amount sequence meeting user equipment multiple code capacity on the basis of "quasi-proper" code amount sequence.

Description

(1) Technical field: [0001] The invention belongs to the field of telecommunication, and in particular relates to a method for allocating Orthogonal Variable Spreading Factor (OVSF) codes in a Code Division Multiple Access (CDMA) mobile communication system. (two) background technology: [0002] The OVSF code is a code constructed with a binary tree structure, such as figure 1 shown. Let C SF，N Represents an OVSF code, where SF is the spreading factor, and N is the code sequence number of a specific code in the corresponding SF class (values ​​are 0, 1, 2 until SF-1). [0003] In a mobile communication system based on CDMA technology, the Orthogonal Variable Spreading Factor (OVSF) code can be used as the downlink channelization code to distinguish different wireless physical channels and ensure their orthogonality, which is flexible and flexible. The variable spreading factor can also make these channels adapt to the different service bandwidth requirements of mobile use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04B1/707H04B7/26H04J11/00
Inventor 何红永郭淑明
Owner INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND