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Method for allocation of Walsh code resource

A terminal allocation and encoder technology, applied in multiplexing code allocation, network traffic/resource management, encoding, etc., can solve problems such as reducing the efficiency of Walsh code space encoding

Inactive Publication Date: 2003-04-16
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When selecting a terminal to transmit data in each frame, if the amount of data to be transmitted is small and the channel environment is good, the coding efficiency of the Walsh code space will be reduced

Method used

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  • Method for allocation of Walsh code resource
  • Method for allocation of Walsh code resource
  • Method for allocation of Walsh code resource

Examples

Experimental program
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no. 1 example

[0043] Figure 5 shows the process of selecting the data rate in Figure 4 and selecting the number of Walsh codes by data rate.

[0044] The scheduler of the base station selects a terminal to transmit data using channel environment feedback information (C / I) and transmission data information from the terminal in each frame (step S10).

[0045] When a terminal for transmitting data is selected, the scheduler selects the maximum data rate (DRA) in FIG. 4 using C / I from the corresponding terminal (step S11). Here, the threshold number that must be compared to determine the DRA is represented by "number of slots per packet (4) x payload size (6)", that is, 24. As shown in Figure 4, some of the 24 data rates are identical. Since the same data rate has similar thresholds, they can be grouped together. There are 15 data rates in the current system, so there are 15 thresholds.

[0046] Correspondingly, the base station compares the received C / I with 15 thresholds to determine the D...

no. 2 example

[0061] Figure 6 shows the process of selecting the terminal, the data rate of the terminal and the Walsh code.

[0062] Referring to FIG. 6, the value of "I" indicating the order of the terminal (CDM terminal) is set to "1" (step 821). Here, the "I" value is used as a variable for counting terminals capable of simultaneously transmitting data at the same time.

[0063] Thereafter, the data rates of all terminals are determined using the PWR, NW and CQI information (step S22). At this time, it is assumed that all Walsh codes are assigned to one terminal.

[0064] Here, PWR denotes the available power in the forward packet data channel (F-PDCH), NW is the number of 32-chip Walsh codes available for the F-PDCH, and CQI denotes the channel quality indicator.

[0065] The scheduler assigns a priority value to each terminal by reflecting the data rate obtained in step S22 (step S23). Wherein the priority value can be a value other than 0.

[0066] That is, higher data rates are ...

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Abstract

The present invention relates to a mobile communication system, and more particularly, to a method of allocating a Walsh code resource. The present invention includes determining an available maximum data rate by comparing a channel information value of a forward link with a first threshold value, determining a data rate based on a quantity of data to be transmitted, terminating to allocate the walsh codes or determining a number of the walsh codes to be requested for the data according to a comparison between the data rates, and determining a number of walsh codes for other terminals by checking a number of remaining walsh codes excluding the number of the requested walsh codes from available walsh codes.

Description

[0001] This application claims the benefit of Korean Application Nos. P01-60965 filed September 29, 2001 and P01-69972 filed November 10, 2001, which are incorporated herein by reference. technical field [0002] The invention relates to a mobile communication system, in particular to a method for allocating Walsh code resources. Background technique [0003] Generally speaking, the wireless communication environment is a channel that changes with the change of the terminal's location and mobility, which requires an adaptive method for the variable channel. Methods of efficiently using wireless channels and transmitting data at high speed in a time-varying wireless channel environment are divided into methods of receiving channel changes and adaptively changing modulation types and methods of changing channel coding. [0004] In order to use channel coding to increase redundant information data and reduce the error rate, the key is to increase the data sent to the wireless c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00
CPCH04J13/18H04W72/0466H04J13/0048H04W28/22
Inventor 李永朝尹宁佑安宗会尹硕铉刘哲雨
Owner LG ELECTRONICS INC