Method for configuring a telecommunication system

• US 6,510,137 B1
• Filed: 08/21/2000
• Issued: 01/21/2003
• Est. Priority Date: 08/19/1999
• Status: Expired due to Term

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Mitsubishi Electric Telecom Europe (Mitsubishi Electric Corporation)
• Inventors: Belaiche, Vincent Antoine Victor
• Primary Examiner(s): Yao, Kwang Bin
• Application Number:
  US09/641,918
• Time in Patent Office: 883 Days
• Field of Search: 370/252, 370/253, 370/254, 370/255, 370/329, 370/335, 370/345, 370/349, 370/465, 370/468, 370/535, 370/229, 370/230, 370/232, 370/233, 370/234, 370/235, 370/236, 375/224, 375/225
• US Class Current: 370/232
• CPC Class Codes: H04B 7/264 for data rate control
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0067 Rate matching H04L1/0013 and H04L1/08 take precedence
• CPC Class Codes: H04L 1/0068 by puncturing

Abstract

A method and system for configuring a CDMA telecommunications system having at least one sending entity and at least one receiving entity, each entity configured to transmit data on at least one physical channel (DPDCH) via a transport channel composite (CCTrCH) of multiple transport channels. At least one entity includes a data processing module configured to determine for each transport channel a first parameter (RMi) proportional to a rate matching ratio (RFi) and a second parameter representing a maximum physical rate (Ndata) and to transform for each of the transport channels a number of symbols before rate matching (Nk) into a number of symbols after rate matching (Nk+ΔNk), where the number of symbols after rate matching (Nk+ΔNk) is obtained approximately by multiplying the number of symbols before rate matching (Nk) by the rate matching ratio (RFi).

Claims

1. A method for configuring a telecommunication system comprising a plurality of entities, said entities implementing a step for transmission of data transported on at least one physical channel, said at least one physical channel transmitting a transport channel composite and having a maximum physical rate, said transport channel composite comprising a plurality of transport channels, said data transmission step being preceded by a data processing procedure for each of said transport channels, said data processing procedure comprising at least one rate matching step, said rate matching step transforming a number of symbols before said rate matching step into a number of symbols after said rate matching step, said number of symbols after said rate matching step being obtained approximately by multiplying said number of symbols before said rate matching step by a rate matching ratio specific to each of said transport channels, wherein

said method comprises a determining step in which at least one of said entities as a first entity determines a variation between the number of symbols after said rate matching step and the number of symbols before said rate matching step, for each of said processing procedures, based on a first parameter and a second parameter, said first parameter representing said rate matching ratio for each of said processing procedures, said second parameter representing said maximum physical rate for said transport channel composite,

at least one transport format is defined for each transport channel, at least one transport format combination determines a transport format among said defined transport formats for each of said transport channels, each transport channel comprising at least one data block type, said data block type depending at least on said transport channel and a transport format of the transport channel concerned, each data block type defining a number of symbols of the concerned data block before said rate matching step, and

said step of determining the variation between the number of symbols before said rate matching step and the number of symbols after said rate matching step comprises:

calculating a temporary variation for each of said at least one data block type starting from said first and second parameters and said number of symbols before said rate matching step;

correcting a temporary rate for said transport channel composite resulting from said calculated temporary variation for each of said at least one data block type, for said at least one transport format combination, so that said temporary rate does not exceed said maximum physical rate for said at least one transport format combination, said correction step being a global correction step; and

determining final variations for said at least one transport format combination, a final variation being determined for each of said at least one data block type.

2. The method according to claim 1, wherein said calculation step comprises the following for each of said transport channels:

a first step to calculate the rate matching ratio of the transport channel concerned as a function of said first and second parameters and said number of symbols before said rate matching step;

a second step to calculate temporary variations for each of said types of data blocks depending on said transport channel concerned, said second calculation step depending on said rate matching ratio and said number of symbols before said rate matching step, so that said rate matching ratio is approximately equal to the ratio between firstly the number of symbols after said rate matching step and secondly the number of symbols before said rate matching step.

3. The method according to claim 1, wherein said global correction step comprises the following steps iteratively for each of said at least one transport format combination:

calculating a temporary rate for said transport channel composite as a function of said calculated temporary variation for each of said at least one data block type and said number of symbols before said rate matching step, for the transport format combination concerned;

comparing said calculated temporary rate for said transport channel composite with said maximum physical rate for the transport format combination concerned; and

if said calculated temporary rate for said transport channel composite exceeds said maximum physical rate, correcting at least some of said calculated temporary variation for each of said at least one data block type as a partial correction step.

4. The method according to claim 3, wherein said step calculating a temporary rate of the transport channel composite is given by the following formula:

$D^{\mathrm{temp}}<br><br>\left(l\right)=\underset{i=1}{\overset{i=T}{\sum <br><br>}}<br><br>\underset{k\in <br><br>\mathrm{CBS}<br><br>\left(i,{\mathrm{TF}}_i<br><br>\left(l\right)\right)}{\sum <br><br>}<br><br><br><br>\frac{N_k+\mathrm{\Delta <br><br>}<br><br>\text{\hspace{1em}<br><br>}<br><br>N_k^{\mathrm{temp}}}{F_i}<br><br>$

where

D^temp(l) is the temporary composite rate for transport format combination l;

CBS(i,j) is the set of types of data blocks for transport channel i for transport format j;

TF_i(l) is the transport format for transport channel i in the transport format combination l;

T is the number of transport channels in the composite;

N_k is the number of symbols in the data block type k;

Δ

N_k^temp is the temporary variation in data block type k; and

F_i is a factor specific to transport channel i.

5. The method according to claim 3, wherein said partial correction step comprises:

a step in which an ordered list of a set of data block types is created, said set being defined so that, for each transport channel, an element of said set is a function of the transport channel and the transport format determined for said transport channel by the transport format combination concerned;

for each element in said list, a step in which a coefficient is calculated that increases as a function of the order of said list;

for each element of said list, a step in which an intermediate variation is calculated as a function of the difference between firstly said increasing coefficient and secondly its predecessor if there is one, or otherwise is equal to a null value;

for each element in said list, a step in which a corrected temporary variation is determined.

6. The method according to claim 5, wherein said increasing coefficient is approximately equal to a product of the maximum physical rate by a factor representing the ratio between a partial sum and a total sum, the summation being made in an order of said list.

7. The method according to claim 6, wherein a generic term of said partial and total sums is proportional to:

said first parameter of the transport channel concerned corresponding to an element of said list for which the summation is made;

said number of symbols defined by the type of data blocks corresponding to the element of said list for which the summation is made.

8. The method according to claim 7, each transport channel being transmitted on at least one transmission time interval with a duration specific to the transport channel concerned, wherein said common period corresponding to the duration of a multiplexing frame, said step in which intermediate variations are calculated is given by the following formula:

9. The method according to claim 5, wherein said step to determine the corrected temporary variation is carried out assuming that the calculated intermediate variation is less than the temporary variation corresponding to the element in said list concerned, and in that said determination step comprises assigning the calculated intermediate variation to the temporary variation.

10. The method according to claim 1, wherein said step in which the final variations are determined comprises assigning the last temporary variations to said final variations.

11. The method according to claim 2, wherein during said step to calculate the rate matching ratio, said calculated rate matching ratio is approximately equal to a product of firstly said first parameter for the transport channel concerned and secondly a factor representing a ratio between said maximum physical rate and an estimator of the maximum composite rate, said estimator being calculated assuming that each of said rate matching ratios is respectively equal to said first parameter as a function of the transport channel concerned.

12. A method for configuring a telecommunication system including a plurality of entities configured to transmit data on at least one physical channel, said at least one physical channel transmitting a transport channel composite and having a maximum physical rate, said transport channel composite comprising a plurality of transport channels, each transport channel having at least one transport format, each transport format corresponding to a data block type, said at least one transport format being predetermined for each transport channel, each of said transport channels being processed by a separate and distinct processing procedure, said transport channel composite having at least one transport format combination, each transport format combination resulting from a predetermined transport format for each of said transport channels, said method comprising the steps of:

transforming, for a data block of each of said transport channels, an input number of symbols into an output number of symbols, said output number of symbols being obtained approximately by multiplying said input number of symbols by a rate matching ratio specific to each of said transport channels; and

determining, for said data block of each of said transport channels, a variation between the output number of symbols and the input number of symbols based on a first parameter representing said rate matching ratio for each processing procedure and a second parameter representing said maximum physical rate for said transport channel composite, said determining step including,

calculating a temporary variation, for each of said at least one data block type, starting from said first parameter, said second parameter, and said input number of symbols,

correcting a temporary rate for said transport channel composite resulting from said calculated temporary variation for each of said at least one data block type, for each of said at least one transport format combination, so that said temporary rate for said transport channel composite does not exceed said maximum physical rate for said at least one transport format combination, said correcting step being a global step, and

determining a final variation for each of said at least one data block type of each of said transport channels comprised within said transport channel composite for said at least one transport format combination.