Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
2001-04-10
2004-05-04
Patel, Ajit (Department: 2664)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C370S394000, C370S338000
Reexamination Certificate
active
06731623
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a data processing method for hybrid automatic repeat for request (hereinafter, referred to as an ARQ) type II/III on a downlink of a wide-band radio communication system; and, more particularly, to a method for processing a radio link control protocol data unit (RLC-PDU) and a HARQ-RLC-Control-PDU, which is extracted from the RLC-PDU, by using a transport channel such as a downlink shared channel (DSCH), wherein the RLC-PDU is used in W-CDMA based on a next generation mobile communication network, such as an international mobile telecommunication (IMT)-2000 and a universal mobile telecommunications system (UMTS), and to a recording media having a computer readable program for carrying out the method.
DESCRIPTION OF THE PRIOR ART
Terms used in this specification will be described.
“A radio network controller-radio link control (RNC-RLC)” is a radio link control protocol level entity of a radio network controller (RNC).
“A radio network controller-medium access control dedicated entity (RNC-MAC-D)” is a medium access control protocol level dedicated entity of a radio network controller (RNC).
“A radio network controller-medium access control common/shared entity (RNC-MAC-C/SH)” is a medium access control protocol level terminal common/shared entity of a radio network controller (RNC).
“Node B-L1” is a physical channel layer entity of a node B. The node B represents a base transceiver station (BTS) in an asynchronous IMT-2000 system. In this specification, the node B is used as the same meaning as the base transceiver station (BTS).
“User equipment-L1 (UE-L1)” is a physical channel level entity of a user equipment (UE) (or a mobile station).
“User equipment-medium access control common/shared dedicated entity (UE-MAC-C/SH)” is a medium access control protocol level terminal common/shared entity of a user equipment (UE) (or a mobile station).
“User equipment-medium access control dedicated entity (UE-MAC-D)” is a medium access control protocol level terminal dedicated entity of a user equipment (UE) (or a mobile station).
“User equipment-radio link control (UE-RLC)” is a radio link control protocol level entity of a user equipment (UE) (or a mobile station).
“User equipment-radio resource control (UE-RRC)” is a radio resource control protocol level entity of a user equipment (UE) (or a mobile station).
“Iub” denotes an interface between the RNC and the Node B (BTS).
“Iur” denotes an interface between the RNC and another RNC.
“Uu” denotes an interface between the Node B and the UE.
“Logical channel” is a logical channel used for transmitting and receiving data between the RLC protocol entity and MAC protocol entity.
“Transport channel” is a logical channel used for transmitting and receiving data between the MAC protocol entity and a physical layer.
“Physical channel” is a practical channel used for transmitting and receiving data between a mobile station and a BTS.
When transporting the data from a radio network of a UMTS terrestrial radio access network (UTRAN) to the mobile station (MS), a Hybrid ARQ type II/III which has superior throughput than a Hybrid ARQ type I may be used.
FIG. 2
is a diagram showing a general wide-band radio communication network (WCDMA). A UTRAN environment is used as an example in this drawing.
As described in
FIG. 2
, the UTRAN includes a user equipment (UE)
10
, an asynchronous radio network
20
and a radio communication core network
30
, such as a GSM-MAP core network.
A Hybrid ARQ type II/III is adapted between the UE and the asynchronous radio network
200
. When a received data has an error, a receiving part requests a transmission part to re-transmit the received data.
A protocol stack structure in the above-referenced interlocking structure is illustrated in FIG.
4
.
FIG. 3
is a diagram showing a general UTRAN. In
FIG. 3
, the In is an interface between the radio communication core network
300
and the asynchronous radio network
200
, and, the Iur means a logical interface between radio network controllers (RNC) of the asynchronous radio networks
200
and the lub shows an interface between the RNC and the Node B. Meanwhile, the Uu shows a radio interface between the UTRAN and the UE.
In here, the Node B is a logical node, which is responsible for a radio transmission/receiving from one or more cell to the UE.
Generally in the UTRAN, if a received data has an error, the receiving part requests re-transmission of the data to the transmission part by using an automatic repeat request (ARQ) method. The ARQ method is divided to ARQ type I, II and III, and technical characteristics of each type are described below.
The ARQ is an error control protocol, which automatically senses an error during transmission and then requests re-transmission of the error-containing block. That is, the ARQ is one of data transmission error control methods, and when an error is detected, automatically generates a re-transmission request signal to cause re-transmission of the data.
The ARQ method is used in the UTRAN for a transmission packet data. The receiving part requests the transmission part to re-transmit an error-containing packet. However, when using the ARQ method, if the number of re-transmission requests are increased, then the throughput, which is amount of data transmitted in a predetermined period, is decreased. To solve the problem, the ARQ can be used along with a forward error correction coding (FEC) method, which is called as a hybrid ARQ.
The hybrid ARQ has three types I, II and III.
In case of type I, one coding rate is selected, for example, one coding rate selected from no coding, rate 1/2 and rate 1/3 of convolutional codings, according to channel environment or required quality of service (QoS) and the selected coding rate is continuously used. If there is a re-transmit request, the receiving part removes pre-received data and the transmission part re-transmits the data with the pre-transmitted coding rate. In this case, the coding rate is not changed according to changeable channel environment, so, when compared with the type II and III the throughput may be decreased.
In case of type II ARQ, if the receiving part requests data re-transmission, then the data is stored onto a buffer at the receiver and the stored data is combined with the retransmitted data. That is, at first, the data is transmitted with a high coding rate and in case of re-transmitting, the data is transmitted with a lower coding rate and it is combined with the pre-received stored data to increase efficiency compared to the type I. For example, a convolutional coding rate 1/4, which is a mother code, may generates coding rates 8/9, 2/3 or 1/4 by puncturing, and it is called a rate compatible punctured convolutional (RCPC) code. The RCPC code is illustrated in FIG.
1
.
Meanwhile, a rate compatible punctured turbo (RCPT) code is obtained by puncturing a turbo code. Referring to
FIG. 1
, at first, a data is transmitted with a coding rate of 8/9, and this version of the data is called as ver(0), an error is detected in the data by checking a cyclic redundancy check (CRC) and the data is stored to a buffer and re-transmission is requested. At this time, the re-transmission is performed with a coding rate 2/3 and the re-transmission version is designated ver(1).
The receiving part combines the ver(0) data stored in the buffer and the ver(1) data, then the combined data is decoded and checked by the CRC. The above-referenced process is repeated until no error is detected, then, the last transmitted ver(n) is combined with a pre-transmitted ver(n−a)(0<a<n).
The type III ARQ is similar to the type II ARQ. It is different in that the re-transmitted ver(n) data is decoded before combined with the ver(n−a) data, and checked by the CRC then, if there is no error, the ver(n) data is transmitted to an upper layer. If an error is detected, the retransmitted ver(n) data is combined with ver(n−a) and checked by the CRC to determine if further data re-transmission is necessary.
Accordingly, the hybrid AR
Lee Chong-Won
Lee Yu-Ro
Park Jae-Hong
Ye Jeong-Hwa
Baker & Botts LLP
Hyundai Electronics Industries Co,. Ltd.
Patel Ajit
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