Method and apparatus for transmitting uplink data in a wireless access system

A wireless access system and data technology, applied in wireless communication, transmission system, multi-frequency code system, etc., can solve the problems of low transmission frequency, increase in bit size, control channel overhead for scheduling information transmission, etc. The effect of avoiding resource waste and reducing control overhead

Inactive Publication Date: 2013-04-24
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3. Low transmission frequency (can be periodic)
[0012] 6. Low mobility or fixed
[0015] Also, in the case where a large number of MTC UEs employed by the same user or service provider generate a small amount of data with the same characteristics and transmit the data to the base station according to the same time period, the conventional resource allocation method used for this is not only in the control The aspect of channel overhead for scheduling information transmission is unfavorable, and in the sense that the control overhead (e.g., MAC header) etc. in the MAC layer requesting regular data transmission increases significantly compared to the bit size of the actual information
[0016] In addition, it would be inappropriate to apply a conventional channel coding scheme to perform a small amount of data transmission, and it would be inappropriate to apply HARQ with the size of the attached CRC, apply a physical resource block size used as a conventional resource allocation unit, etc.

Method used

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  • Method and apparatus for transmitting uplink data in a wireless access system
  • Method and apparatus for transmitting uplink data in a wireless access system
  • Method and apparatus for transmitting uplink data in a wireless access system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0132] The first embodiment provides a method for multiple MTC UEs to transmit UL data in a CDM manner according to the embodiment of the present invention.

[0133] Figure 6 is a flow chart showing the UL data transmission method of the MTC UE according to the first embodiment of the present invention.

[0134] refer to Figure 6 , the MTC UE receives UL resource allocation information (ie, UL grant) for UL data transmission from the BS through a DL control channel (step S610 ). Here, the UL resource allocation information includes at least resource block allocation information related to resource blocks allocated to each slot constituting a subframe and Modulation and Coding Scheme (MCS) information. Here, resource block allocation information and MCS information may be transmitted semi-statically through higher layer signaling.

[0135] Then, the MTC UE receives sequence information related to a sequence allocated for each UE from the BS to transmit UL data in a CDM man...

no. 2 approach

[0176] The second embodiment provides a HARQ ACK / NACK feedback method for a plurality of MTC devices transmitting UL data based on CDM according to an embodiment of the present invention.

[0177] Figure 7 is a flowchart illustrating a HARQ ACK / NACK feedback method according to the second embodiment of the present invention.

[0178] Since step S710 to step S740 and Figure 6 Steps S610 to S640 are the same, so descriptions thereof are omitted, and only different steps (ie, S750 ) will be described.

[0179] After step S740, the BS transmits a HARQ response to the UL data received from the MTC UE to the MTC UE through the PHICH (step S750). Here, the HARQ response refers to HARQ ACK or NACK.

[0180] A resource mapping method for a PHICH on which a HARQ response is transmitted will be described below.

[0181] First, the PHICH in the 3GPP LTE / LTE-A system will be briefly described.

[0182] PHICH is a channel for transmitting ACK / NACK information for a UL data channel. ...

no. 3 approach

[0218] Third Embodiment According to an embodiment of the present invention, a UL data retransmission method is provided when an MTC UE receives a HARQ NACK for UL data from a BS.

[0219] Figure 8 It is a flow chart showing the UL data retransmission method of the MTC UE according to the third embodiment of the present invention.

[0220] Since step S810 to step S850 and Figure 7 Steps S710 to S750 are the same, so descriptions thereof are omitted, and only different steps (ie, S860 ) will be described.

[0221] After step S850, the MTC UE performs a retransmission process for UL data (ie, PUSCH) (step S860). Here, the MTC UE may perform the retransmission process by using a synchronous non-adaptive scheme or a synchronous adaptive scheme.

[0222] First, in a process of performing retransmission on corresponding PUSCH transmission by using a synchronized non-adaptive scheme, initial UL data transmission can be realized by multiplexing 12 MTC UEs by means of CDM in a giv...

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Abstract

The present description relates to a method for a terminal to transmit uplink (UL) data in a wireless access system, comprising the following steps: receiving uplink resource allocation information for uplink data transmission from a base station via a downlink control channel, wherein the uplink resource allocation information includes resource block allocation information for each slot of a subframe and modulation and coding scheme (MCS) information; receiving, from the base station, sequence information allocated to each terminal so as to transmit uplink data through a code division multiplexing (CDM) scheme in cooperation with other terminals in a resource block pair region of the subframe; and transmitting uplink data to the base station through the resource block pair region in accordance with the received sequence information.

Description

technical field [0001] The present invention relates to a wireless access system, and more particularly to a method and device for transmitting uplink data. Background technique [0002] The following briefly describes Machine-to-Machine (M2M) communication (Machine Type Communication MTC). [0003] Machine-to-machine (M2M) communication actually means communication between electronic devices. That is, M2M communication means communication between things. In general, M2M communication refers to wired or wireless communication between electronic devices or communication between devices controlled by humans and machines, but M2M communication is used to specifically refer to communication between electronic devices and electronic devices (ie, multiple devices) for wireless communication. In addition, M2M devices used in cellular networks have lower performance or capabilities than general terminals. [0004] There are many terminals in a cell, and the terminals can be clas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/26H04W72/00
CPCH04W72/0446H04W72/042H04L5/0094H04W72/0466H04L5/0053H04W4/70H04W72/23H04B1/713H04L1/1864H04W72/21
Inventor 朴奎镇金东哲赵汉奎林东局
Owner LG ELECTRONICS INC
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