KR101770205B1 - Apparatus and method for transmitting ul data burst in a wireless access system - Google Patents

Abstract

The present invention relates to a method for transmitting uplink data bursts in a wireless access system, the method comprising: determining resource allocation information for contention-based uplink data burst transmission and determining a number of terminals attempting to transmit a contention based uplink data burst; Receiving a first message including control information from a base station; And transmitting an uplink data burst to the base station through a resource region allocated from the resource allocation information based on the control information.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting an uplink data burst in a wireless access system,

The present disclosure relates to wireless access systems, and more particularly, to a method and apparatus for transmitting contention-based uplink data bursts.

The MS can transmit UL data to the BS through a random access procedure and a Scheduled Access procedure.

Generally, when there are few users in the cell, the random access process is more efficient in terms of latency and throughput than a scheduled connection process.

When there are a large number of users in the cell, the probability of contention of random access increases, and the efficiency for uplink transmission drops sharply.

However, when the coverage is wide such as the cellular network, centralized control through scheduling is efficient when there are a large number of users.

Small cells such as femtocells are cellular based, but random access is efficient because fewer users are in the cell.

Hereinafter, a general landing access process will be briefly described with reference to the drawings.

1 illustrates an uplink resource allocation procedure of a UE using a contention-based request scheme.

Referring to FIG. 1, the UE transmits a randomly selected CDMA code to a randomly selected slot in a region allocated for a bandwidth request in an uplink (S110).

If the BS recognizes the CDMA code transmitted from the MS, the BS allocates resources for transmitting the bandwidth request message using the CDMA allocation information element (CDMA_Allocation_IE) (S120).

The MS receiving the information on the uplink resource for transmitting the bandwidth request message transmits a bandwidth request message to the corresponding resource area. At this time, the terminal can use a bandwidth request header (BR header), and the header includes information about the size of the requested bandwidth and the like (S130).

If the bandwidth requested by the UE is available, the Node B allocates the uplink resource to the UE (S140).

The MS transmits data to the allocated uplink resources (S150).

2 is a diagram showing an example of a bandwidth requesting process based on a 3-step random access connection.

In a broadband wireless access system, a terminal can use a three-step or five-step random access method. The 5-step random access method can be used independently of the 3-step random access method, and can be used as a fall-back mode in a 3-step method.

An Advanced Mobile Station (AMS) transmits a Bandwidth Request preamble sequence and a Quick Access Message to a Serving Advanced Base Station (S-ABS) at an arbitrarily selected time S210).

In this case, the fast access message may include a station ID, which is uplink bandwidth request information, a bandwidth request size, a BR index indicating QoS, and the like.

The BS may transmit the BR preamble sequence transmitted by the MSs and the BR ACK A-MAP information element indicating the reception state of the fast access message to the MSs in a broadcast / multicast manner (S220).

The BS receiving the BR preamble sequence and the fast access message normally allocates uplink resources to each UE and transmits UL resource allocation information to the UL basic assignment A-MAP IE To each terminal (S230).

The UE can transmit the uplink data to the BS through the allocated uplink transmission region. At this time, the terminal may transmit additional uplink bandwidth request information to the base station (S240).

FIG. 3 is a diagram showing an example of a bandwidth requesting process based on a 5-step random access as an action method in case of a failure in 3 steps.

The MS transmits the BR preamble sequence (or BR code), the uplink bandwidth request information (Station ID), the BR index indicating the request size and the QoS to the BS using the high-speed access message (S310).

The BS can transmit the reception state of the BR preamble sequence and the fast access message transmitted from the MSs to the MSs through the BR ACK A-MAP information element. However, it is assumed that the BR preamble sequence is normally decoded, but the fast access message has an error. Accordingly, the BR ACK A-MAP information element indicates that the BR preamble sequence is normally received and that the fast access message has an error (S320).

The BS, which normally receives only the BR preamble sequence transmitted by the MS, transmits uplink resources for transmitting a bandwidth request (BW-REQ) message to the MS through the CDMA Allocation A-MAP IE (S330).

In step S330, the CDMA A-MAP information element may be transmitted to the MS in a grant format for the independent BR.

The mobile station transmits a BW-REQ message (e.g., an independent BR header type) to the base station through the allocated area (S340).

The BS receiving the BW-REQ message transmitted by the MS allocates the uplink resource to the MS using the UL basic assignment A-MAP IE or the grant message for uplink data transmission (S350).

The UE transmits UL data to the BS through the allocated UL resource region. At this time, the MS may transmit additional uplink bandwidth request information to the BS (S360).

Fig. 3 shows a five-step random access method as a fail-over method for the three-step random access method of Fig. However, the general 5-step method differs from FIG. 3 only in that the terminal does not send a quick access message in step S310, and the remaining steps may be performed using the steps described in FIG. 3 as it is.

As described above, in the general random access procedure, uplink resources are allocated according to the request of the UE, and uplink data burst transmission is performed through the allocated resource region.

The present disclosure provides a method for allowing a terminal to utilize UL resources not used by a base station for uplink data burst transmission through a contention-based random access.

In addition, the present invention provides a method by which a user can transmit and receive data without unnecessary bandwidth request or the like in a small environment.

The present invention relates to a method for transmitting uplink data bursts in a wireless access system, the method comprising: determining resource allocation information for contention-based uplink data burst transmission and determining a number of terminals attempting to transmit a contention based uplink data burst; Receiving a first message including control information from a base station; And transmitting an uplink data burst to the base station through a resource region allocated from the resource allocation information based on the control information.

In addition, the control information is MCS bound information having a CQI feedback level value reported by the UE.

In addition, the control information is minimum access class information.

The uplink data burst is transmitted to the base station when the latest CQI feedback value of the terminal or the connection class of the terminal has a value greater than or equal to the control information.

In addition, the first message is a random access A-MAP message.

The first message is CRC masked with a broadcast STID or a multicast STID, and is transmitted.

In addition, the resource allocation information may include at least one of a resource allocation location, a resource allocation region size, and MCS information, and the first message may include at least one of a maximum retransmission number information and HARQ ACK channel information. do.

Comparing a size of the resource allocation area with a size of an uplink data burst for transmission to the base station; And transmitting a bandwidth request message to the BS when the size of the uplink data burst to be transmitted is greater than the size of the uplink data burst to be transmitted.

Receiving an uplink basic allocation map message from the base station; And transmitting the remaining uplink data burst to the base station through a resource region allocated in the uplink basic allocation MAP message.

In addition, the message for the bandwidth request is a bandwidth request extension header, and the bandwidth request extension header is piggybacked with the uplink data burst.

In addition, the uplink data burst is transmitted in an MAC PDU, and the MAC PDU includes a terminal identifier for identifying the terminal.

Receiving an indicator indicating whether the first message is transmitted from the base station; And determining whether to monitor the first message using the received indicator.

In addition, the first message may further include total stream number (TNS) information indicating a total number of streams used for uplink data burst transmission.

The method may further include selecting any one of the total number of streams and transmitting the uplink data burst to the base station through the selected stream.

The present invention also provides a terminal for uplink data burst transmission in a wireless access system, comprising: a memory; A wireless communication unit for transmitting and receiving a wireless signal to and from the outside; And a control unit for receiving from the base station a first message including control information for determining resource allocation information for contention-based uplink data burst transmission and a number of terminals attempting to transmit uplink data burst based on contention, And controls the wireless communication unit to transmit the uplink data burst to the base station through the resource area allocated from the resource allocation information based on the control information.

The control unit controls the uplink data burst to be transmitted to the base station when the latest CQI feedback value of the terminal or the access class of the terminal has a value greater than or equal to the control information.

Also, the controller compares the size of the resource allocation area included in the resource allocation information with the size of the uplink data burst to be transmitted to the base station, and when the size of the uplink data burst to be transmitted is larger, And controls the wireless communication unit to transmit a message for bandwidth request to the base station.

The control unit controls the wireless communication unit to receive the uplink basic allocation MAP message from the base station and transmits the remaining uplink data burst to the base station through the resource area allocated in the uplink basic allocation MAP message And controls the wireless communication unit.

In addition, the message for requesting the bandwidth is a bandwidth request extension header, and the controller controls the wireless communication unit to piggyback the bandwidth request extension header and the uplink data burst.

The present invention relates to a method and apparatus for allocating uplink data through a UL resource allocated from a base station without waste of resources and time delay due to code-based bandwidth request, There is an effect that can be transmitted.

Also, even when the contention probability of random access is small in a system having a small number of users such as a femtocell, data can be efficiently transmitted as compared with a scheduling method using a code-based bandwidth request.

1 is a diagram illustrating an uplink resource allocation procedure of a UE using a contention-based request scheme;
2 is a diagram showing an example of a bandwidth request process based on a 3-step random access connection;
FIG. 3 is a diagram showing an example of a bandwidth requesting process based on a 5-step random access as an action method in case of a failure in 3 steps; FIG.
4 is a diagram illustrating a contention-based uplink data transmission method according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a contention-based uplink data transmission method using a BR header when a grant size according to another embodiment of the present invention is insufficient.
FIG. 6 is a diagram illustrating a contention-based uplink data transmission method by piggybacking BR EH and some UL data when a Grant Size according to another embodiment of the present invention is insufficient.
7 is a block diagram illustrating a wireless communication system in accordance with one embodiment of the present disclosure;

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the present disclosure will be described, and the description of other parts will be omitted so as not to obscure the gist of the present specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following embodiments are to be construed as integrating the elements and features of the present specification in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, it is also possible to construct embodiments of the present specification by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

The embodiments of the present invention have been described with reference to data transmission / reception between a base station and a terminal. Here, the BS has a meaning as a terminal node of a network that directly communicates with the MS. The specific operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. The term 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), and Mobile Subscriber Station (MSS).

Embodiments of the present disclosure may be implemented by various means. For example, embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof.

For hardware implementation, the method according to embodiments of the present disclosure may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to embodiments of the present invention may be implemented in the form of a module, a procedure or a function, etc., to perform the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

It is to be understood that the specific terminology used herein is for the purpose of enhancing the understanding of the present specification, and the use of such specific terminology may be changed into other forms without departing from the spirit of the present specification.

First Embodiment

The first embodiment provides a contention-based uplink data transmission method using Random Access A-MAP.

Competitive Infrastructure ( Contention - based ) Random access ( Random Access Resource allocation method

The base station transmits a CRC masked control message to the UE using a predetermined identifier (ID). Here, the control message may be a random access A-MAP or a PDCCH. Also, the control message may be transmitted every frame or transmitted every subframe, and may be periodically or aperiodically transmitted to the terminal at a predefined position or a predetermined position of the frame or subframe.

Hereinafter, an example of the Random Access A-MAP (RA A-MAP) as an example of the control message will be described.

The control message may include a resource allocation location for uplink data burst transmission, Modulation and Coding Scheme (MCS) information, a maximum retransmission number, HARQ ACK channel information, and the like.

The UE having the ID assigned thereto receives the Random Access A-MAP from the BS according to the uplink data burst transmission need. Herein, the Random Access A-MAP may be broadcast by a base station or may be transmitted by a multicast method.

The MS transmits the uplink data burst to the BS through the resource area allocated by the received Random Access A-MAP.

UL Random Access  A-MAP ( UL RA  A- MAP )

The base station allocates available resources to the UE through the UL RA A-MAP. In this case, the UL RA A-MAP transmitted to the UE can be received by all the UEs by the broadcast scheme. In this case, the base station transmits the UL RA A-MAP to the UE by masking the well-known STID to the CRC.

In addition, the UL RA A-MAP transmitted to the UE can be received by a specific group of terminals by a multicast scheme. In this case, the base station transmits the UL RA A-MAP to a specific group of terminals by masking the multicast STID to the CRC.

The UE having the uplink data to be transmitted to the Node B among the UEs receiving the UL RA A-MAP from the Node B transmits the data burst to the resource region allocated by the received UL RA A-MAP.

Here, the area allocated by the UL RA A-MAP corresponds to an area where contention is generated by a plurality of terminals receiving the UL RA A-MAP from the base station.

Therefore, when a plurality of UEs transmit uplink data bursts in the area, a reception error may occur in the base station.

In this case, when maximum retransmission is supported by HARQ retransmission, if contention occurs in the area, resource waste may occur due to meaningless retransmission.

Therefore, information for limiting the maximum number of retransmissions for retransmission may be included in the UL RA A-MAP, or a retransmission process may not be performed for UL data burst transmission by the UL RA A-MAP.

Contention  Adjustment method

In addition, in order to solve a case where a contention occurs and a reception error occurs as described above, the number of terminals attempting to transmit an uplink data burst can be adjusted. One example is a static method and a dynamic method in connection with the method of controlling the number of terminals.

1. Static Control (Static Control) (How to adjust the number of terminals using STID)

In the case of static control, that is, a method of controlling the number of UEs attempting uplink data transmission using STID, the base station allocates a well-known STID (RNTI in case of 3GPP) in advance so that all terminals can know the STID can do. In this case, the UL RA A-MAP is transmitted to all UEs in a broadcast manner.

Alternatively, the BS may allocate a Multicast STID for each MS during the registration process with the MS so that only the specific group terminal can transmit the UL data burst through the resource area allocated by the UL RA A-MAP .

In another method, the BS allocates Multicast STID to a specific FID (Flow Identifier) during service negotiation with the MS to allow access to the BS only for specific services of specific MSs, thereby adjusting the number of MSs .

2. Dynamic User Control (UL RA A-MAP)

The base station can reduce the reception error due to the contention by adjusting the number of terminals by explicitly including the requirement of the terminal capable of transmitting in the UL RA A-MAP.

The base station can adjust the number of UEs by transmitting distance (reception performance) information or Access priority information to the UL RA A-MAP to the UE.

In addition, the BS may transmit an MCS boundary value (bound) to the UL RA A-MAP to the UE. In this case, based on the current CQI report transmitted to the base station, only UEs having an MCS equal to or greater than a predetermined MCS boundary value can attempt uplink data burst transmission through the allocated region.

For example, it is assumed that the CQI feedback value reported to the base station has a value from 0 to 15. In this case, if the MCS boundary value included in the UL RA A-MAP is 4, in order to transmit the UL data burst through the area allocated by the UL RA A-MAP, the CQI feedback value reported to the BS is 4 or more It should be a terminal.

In addition, the BS may transmit a minimum access class to the UL RA A-MAP. In this case, only UEs having a service whose access class of the current UE is equal to or greater than the minimum included in the UL RA A-MAP can attempt to transmit UL data bursts.

In addition, the BS can inform the UE whether or not it supports the UL RA transmission through a message such as AAI_SCD, AAI_SBC / REG-RSP, or the like.

In this case, the UE can determine whether to monitor the UL RA A-MAP transmitted from the base station by checking the information indicating whether the UL RA transmission is supported by the base station.

Table 1 below shows an example of a format of UL Random Access A-MAP (UL RA A-MAP) when only one stream is used according to an embodiment of the present invention.

Syntax Size in bits Description / Notes UL Random Access A-MAP IE () { - - A-MAP IE Type 4 UL random access A-MAP IE I _sizeoffset 5 Offset used to compute burst size index Resource Index 11 5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index
Resource index includes location and allocation size Long TTI Indicator One Indicates the number of subframes spanned by the allocated resource.
0b0: 1 subframe (default)
0b1: 4 UL subframes for FDD or all UL subframes for TDD
If number of DL subframes, D is less than number of UL subframes, U, Long TTI Indicator = 0b1 HFA 6 HARQ Feedback Allocation Number of Retransmission 2 Maximum number of  retransmissions if decoding is failed .
0 b00 : 0, 0 b01 : 1, 0 b10 : 2, 0b11: 3 MCS  Bound ( Lower ) 4 The MCS bound for this  transmission. AMSs whose latest  nominal MCS reported  is equal or larger than MCS  Bound is allowed to transmit  the data burst through this allocation . MCS  Bound ( Upper ) 4 The MCS bound for this  transmission. AMSs whose  latest nominal MCS reported is  equal or lesser than MCS Bound  is allowed to transmit the data burst through this allocation . Minimum Access Class 2 PDU whose access class is  equal or larger than minimum  access class is allowed to be  sent in this allocation . Reserved 5

Referring to Table 1, the RA A-MAP includes a retransmission number field, an MCS boundary field, and a minimum access class field.

Here, the retransmission number field is a field indicating the maximum number of retransmissions of the MS when the uplink data burst transmission of the MS fails. This is to reduce unnecessary retransmissions.

Also, the MCS Bound field indicates an MCS reference value of a UE capable of contention UL transmission. Only the UEs whose MCS value reported by the UE through the CQI is greater than or equal to the MCS Bound value can transmit the UL data burst through the resource area allocated through the RA A-MAP. That is, based on the CQI report of the UE, only UEs having an MCS value equal to or greater than the MCS threshold value can be attempted to be transmitted.

In addition, the Minimum Access Class field indicates that PDUs whose access class of the UE is greater than or equal to the minimum access class are allowed to be transmitted through the resource area allocated by the RA A-MAP.

That is, only terminals having a service whose connection class is equal to or greater than the minimum connection class can currently attempt uplink data burst transmission.

Table 2 below shows an example of a format of UL Random Access A-MAP (UL RA A-MAP) when MU-MIMO is used according to another embodiment of the present invention.

Syntax Size in bits Description / Notes UL Random Access A-MAP IE () { - - A-MAP IE Type 4 UL random access A-MAP IE I _sizeoffset 5 Offset used to compute burst size index Resource Index 11 5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index
Resource index includes location and allocation size Long TTI Indicator One Indicates the number of subframes spanned by the allocated resource.
0b0: 1 subframe (default)
0b1: 4 UL subframes for FDD or all UL subframes for TDD
If number of DL subframes, D is less than number of UL subframes, U, Long TTI Indicator = 0b1 TNS 2 Total Number of streams in  the LRU for CSM
0 b00 : One stream only , 0 b01 : 2 streams, 0 b10 : 3 streams , 0b11: 4 streams HFA 6 HARQ Feedback Allocation Number of Retransmission 2 Maximum number of  retransmissions if decoding  is failed.
0 b00 : 0, 0 b01 : 1, 0 b10 : 2, 0b11: 3 MCS Bound 4 The MCS bound for this transmission. AMSs latest latest nominal MCS reported is equal or larger than MCS  Bound is allowed to transmit  the data burst  through this allocation . Minimum Access Class 2 PDU whose access class is  equal or larger than  minimum access class is  allowed to be sent in this  allocation. Reserved 5

Referring to Table 2, the RA A-MAP includes a TNS (Total Number of Stream) field.

Here, the TNS field indicates the total number of receivable streams of the UE. That is, the base station informs the total number of receivable streams through the TNS, and the terminal can randomly select among the available streams and transmit the data to one stream.

Device verification ( AMS identification ) Way

As shown in Table 1, since the UL RA A-MAP transmitted by the base station does not have information on the UE, when transmitting data to a resource area allocated to the UL RA A-MAP, the UE adds a terminal identifier ID) to the base station.

For example, in an IEEE 802.16m system, a terminal transmits information on a terminal that transmits uplink data to a base station by transmitting an STID to a base station.

Herein, the UE can transmit the BR Header including the STID to the BS.

In addition, the UE may transmit an EH (Extended Header) indicating the STID to the UL MAC PDU.

When transmitting an extension header (EH) indicating STID, the STID EH can be configured as shown in Table 3 as an example.

EH Type (4) STID (MSB) (4) STID (LSB) (8)

In case of 3GPP LTE, the UE transmits a UE-specific identifier control element (C-RNTI control element) to the base station by including it in the MAC PDU.

Hereinafter, a contention-based uplink data burst transmission method according to an embodiment of the present invention will be described in detail with reference to the drawings. (For example, when there is no HARQ retransmission for an uplink data burst transmitted by a UE do.)

4 is a diagram illustrating a contention-based uplink data transmission method according to an embodiment of the present invention.

Referring to FIG. 4, the BS transmits a UL Random Access A-MAP having a CRC masked by a STID or Multicast STID, which is well known to the UE in a DL subframe or a frame, in step S410.

Herein, the BS may transmit the UL Random Access A-MAP to a predetermined subframe or frame position, or may transmit the position to any subframe or frame position. Also, the base station may transmit the UL Random Access A-MAP periodically or non-periodically (or event-driven) to the UE.

When the MS succeeds in de-masking using the well-known STID or Multicast STID, the MS transmits an uplink data burst to the BS through the UL Random Access A-MAP (S420).

FIG. 5 is a diagram illustrating a contention-based uplink data transmission method using a BR header when a grant size according to another embodiment of the present invention is insufficient.

Since step S501 is the same as step S401, description will be omitted and only differences will be described.

If the size of the resource allocation area received through the UL RA A-MAP is smaller than the size of the data burst to be transmitted to the base station, the terminal transmits the BR Header to the base station for bandwidth request (S520). And transmits the uplink data burst corresponding to the size of the resource allocation area received through the uplink data burst to the base station.

Here, if the size of the resource allocation area received through the UL RA A-MAP is larger than the size of the data burst to be transmitted to the base station, the UE is the same as that in FIG.

The UE receives the UL Basic Assignment A-MAP (UL AA-MAP) from the base station (S530), and transmits the UL data burst through the resource region allocated by the received UL AA-MAP. S540) The UE may transmit the remaining data bursts through the resource area allocated by the UL AA-MAP.

FIG. 6 is a diagram illustrating a contention-based uplink data transmission method through piggybacking of BR EH and some UL data when the Grant Size according to another embodiment of the present invention is insufficient.

Since step S601 is the same as step S401, description will be omitted and only differences will be described.

If the size of the resource allocation area received through the UL RA A-MAP is smaller than the size of the data burst to be transmitted to the base station, the UE allocates the resource area size allocated through the UL RA A- And transmits a part of the uplink data and a piggyback BR extended header to the BS in step S620.

Next, the UE receives the UL Basic Assignment A-MAP (UL AA-MAP) from the BS in step S630 and transmits the UL data burst through the resource area allocated by the received UL AA-MAP. S640)

If a plurality of UL RA A-MAPs are transmitted from the base station, the UE may determine a resource to be used for uplink data burst transmission by using a method used in Random Access.

Second Embodiment

The second embodiment provides a contention-based uplink data burst transmission method using Random Access A-MAP in a machine-to-machine (M2M) environment.

First, the communication between the devices (M2M) will be briefly described.

Machine to Machine (M2M) means communication between an electronic device and an electronic device. That is, it means communication between objects. Generally, it means wired or wireless communication between electronic devices, or communication between a device and a machine controlled by a person, but it is used specifically to mean a wireless communication between an electronic device and an electronic device, that is, between devices. In addition, the M2M terminals used in the cellular network have lower performance or capability than general terminals.

The characteristics of the M2M environment are as follows.

1. A large number of terminals in a cell

2. Small amount of data

3. Low transmission frequency

4. A limited number of data characteristics

5. Not sensitive to time delay

Hereinafter, a contention-based UL data transmission method in the inter-device communication (M2M) will be described in detail.

Group - wise scheduling

When a base station schedules resource allocation on a per-terminal basis, a large number of M2M terminals increases the cost burden. Accordingly, the base station can perform the scheduling on an M2M group basis.

Here, the base station allocates resources in units of M2M groups, and by appropriately adjusting the number and the ratio thereof, the contention UL transmission method can be applied to the M2M environment.

That is, the base station can perform scheduling between M2M groups by considering priority, service type, and resource allocation size among M2M groups.

Polling ( Polling ) Based resource allocation

In the M2M environment, when random access is allowed to terminals, performance of existing terminals may be degraded due to a large number of terminals.

In the M2M environment, since the bandwidth requested by the terminal will be relatively constant, a complicated bandwidth request (BR) also becomes meaningless.

Accordingly, the base station can allocate resources using the RA A-MAP without allowing a bandwidth request to the M2M terminal. Here, the BS may transmit information indicating that the bandwidth request is not allowed to the MS in advance.

In this case, since only the specific M2M terminal tries to transmit the contention-based uplink data, the performance of the existing terminal is not significantly affected. Accordingly, the UE can store the CQI in the UE without using the CQI.

Hereinafter, an operation method of a base station for a contention-based uplink data transmission method in an M2M environment will be described.

First, the base station allocates a multicast STID that can receive a RA A-MAP to a specific M2M group. Here, the BS can allocate the Multicast STID to a specific M2M group in consideration of the number of terminals, resource allocation size, service type, priority, and the like of the M2M group.

Then, the base station masks the corresponding multicast STID to the CRC of the random access A-MAP to allocate resources to the specific M2M group, and transmits the RA A-MAP to the mobile station.

The base station may periodically or non-periodically transmit the RA A-MAP to a terminal at a specific sub-frame or frame location.

Here, when the base station periodically transmits the RA A-MAP to the UE, period information related to the RA A-MAP may be provided in the connection step or may be included in the RA A-MAP or multicast control information to be transmitted to the UE.

How to adjust the number of terminals

The BS can adjust the number and characteristics of the UEs attempting to transmit UL data bursts by including the MCS boundary (Lower, Upper) in the RA A-MAP.

In addition, the terminating station can control the number of UEs by transmitting a minimum access class to the RA A-MAP.

Table 4 below shows an example of the format of the RA A-MAP according to the second embodiment.

Syntax Size in bits Description / Notes UL_Random_Access_A-MAP IE () { - - A-MAP IE Type 4 UL random access A-MAP IE I _sizeoffset 5 Offset used to compute burst size index Resource Index 11 5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index
Resource index includes location and allocation size Long TTI Indicator One Indicates the number of subframes spanned by the allocated resource.
0b0: 1 subframe (default)
0b1: 4 UL subframes for FDD or all UL subframes for TDD
If number of DL subframes, D is less than number of UL subframes, U, Long TTI Indicator = 0b1 HFA 6 HARQ Feedback Allocation Number of Retransmission 2 Maximum number of retransmissions if decoding is failed.
0b00: 0, 0b01: 1, 0b10: 2, 0b11: 3 MCS (Lower) 4 The MCS bound for this transmission. AMSs whose latest nominal MCS reported is equal or greater than MCS Bound is allowed to transmit data burst through this allocation. MCS (Upper) 4 The MCS bound for this transmission. AMSs whose latest nominal MCS reported is equal or less than MCS Bound is allowed to transmit data burst through this allocation. Device ID  Modulo ( DIM ) 2 Device ID To modulo  Value to use b00 : 1, 0 b01 : 2, 0b10: 4, 0 b11 : 8) Acceptance (M) 2 Device ID To DIM to modulo  Only the terminal with M result can be transmitted. } - -

7 is a block diagram illustrating a wireless communication system in accordance with one embodiment of the present disclosure.

The base station 710 includes a control unit 711, a memory 712, and a radio frequency (RF) unit 713.

The control unit 711 implements the proposed functions, processes and / or methods. The layers of the air interface protocol may be implemented by the control unit 711.

The control unit 711 can control to transmit the uplink data burst through the resource allocation area received through the RA A-MAP.

The memory 712 is connected to the controller 711 and stores protocols and parameters for multi-carrier operation. The RF unit 713 is connected to the control unit 711 to transmit and / or receive a radio signal.

The terminal 720 includes a control unit 721, a memory 722, and a radio communication (RF)

The control unit 721 implements the proposed functions, processes and / or methods. The layers of the air interface protocol may be implemented by the control unit 721. The control unit 721 can control to transmit the uplink data burst through the resource allocation region received via the RA A-MAP.

The memory 712 is connected to the controller 721 and stores protocols and parameters for multi-carrier operation. The RF unit 713 is connected to the control unit 721 to transmit and / or receive a radio signal.

The control units 711 and 721 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. Memory 712 and 722 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage media, and / or other storage devices. The RF units 713 and 723 may include a baseband circuit for processing a radio signal. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The module is stored in the memories 712 and 722 and can be executed by the control units 711 and 721. [ The memories 712 and 722 may be located inside or outside the control units 711 and 721 and may be connected to the control units 711 and 721 by various well-known means.

700: Wireless communication system
710:
720:
711, 721:
712, 722: memory
713, 723: radio communication (RF) section

Claims (23)

A method for transmitting uplink data bursts in a wireless access system,
From a base station, a first message including MCS (Modulation and Coding Scheme) boundary value information having a threshold for determining resource allocation information for contention based uplink data burst transmission and contention based uplink data burst step; And
And transmits the uplink data burst to the BS through the resource area allocated from the resource allocation information if the latest CQI feedback value of the MS is equal to or greater than the threshold value of the MCS boundary value information ≪ / RTI > delete delete delete The method according to claim 1,
Wherein the first message is a random access A-MAP. The method according to claim 1,
Wherein the first message is masked by a cyclic redundancy check (CRC) with a broadcast STID (Station Identifier) or a multicast STID. [7] has been abandoned due to the registration fee. The method according to claim 1,
Wherein the resource allocation information includes at least one of a resource allocation position, a resource allocation region size, and MCS information, and the first message includes at least one of a maximum retransmission number information and a HARQ ACK (Hybrid Automatic Repeat Request Acknowledgment) ≪ / RTI > [8] has been abandoned due to the registration fee. 8. The method of claim 7,
Comparing a size of the resource allocation area with a size of an uplink data burst for transmission to the base station; And
And transmitting a bandwidth request message to the BS if the size of the uplink data burst to be transmitted is larger than the size of the resource allocation area as a result of the comparison. [Claim 9 is abandoned upon payment of registration fee.] 9. The method of claim 8,
Receiving an uplink base assignment map message from the base station; And
Further comprising transmitting the remaining uplink data burst to the base station through a resource region allocated in the uplink basic allocation MAP message. [Claim 10 is abandoned upon payment of the registration fee.] 9. The method of claim 8,
Wherein the message for the bandwidth request is a bandwidth request extension header, and the bandwidth request extension header is piggybacked with the uplink data burst. [Claim 11 is abandoned upon payment of the registration fee.] The method according to claim 1,
The uplink data burst is transmitted as a MAC PDU (Medium Access Control Protocol Data Unit)
Wherein the MAC PDU includes a terminal identifier for identifying a terminal. [12] has been abandoned due to the registration fee. The method according to claim 1,
Receiving an indicator from the base station indicating whether the first message is transmitted; And
Further comprising the step of determining whether to monitor the first message using the received indicator. The method according to claim 1,
Wherein the first message further comprises a total number of streams (TNS) information indicating a total number of streams to be used in the uplink data burst transmission. 14. The method of claim 13,
Selecting one of the total streams and transmitting the uplink data burst to the base station via the selected stream. A terminal for uplink data burst transmission in a wireless access system,
Memory;
A wireless communication unit for transmitting and receiving a wireless signal to and from the outside; And
And a control unit,
Wherein the controller includes a first message including MCS (Modulation and Coding Scheme) boundary value information having a threshold for determining resource allocation information for contention-based uplink data burst transmission and contention-based uplink data burst, Controls the wireless communication unit to receive from the base station,
And transmitting an uplink data burst to the BS through the resource region allocated from the resource allocation information if the latest CQI feedback value of the MS is greater than or equal to the threshold value of the MCS boundary value information And controls the wireless communication unit. delete delete delete delete 16. The method of claim 15,
Wherein the first message is a random access A-MAP message. [Claim 21 is abandoned upon payment of the registration fee.] 16. The apparatus of claim 15,
When the size of the uplink data burst to be transmitted is larger than the size of the resource allocation area, if the size of the uplink data burst to be transmitted is larger than the size of the uplink data burst to transmit to the base station, And controls the wireless communication unit to transmit a message for bandwidth request to the base station. [Claim 22 is abandoned upon payment of the registration fee.] 22. The apparatus of claim 21,
Controlling the wireless communication unit to receive the uplink basic allocation map message from the base station and controlling the wireless communication unit to transmit the remaining uplink data burst to the base station through the resource area allocated in the uplink basic allocation map message To the terminal. [Claim 23 is abandoned due to the registration fee.] 23. The method of claim 22,
Wherein the message for the bandwidth request is a bandwidth request extension header and the controller controls the wireless communication unit to piggyback the bandwidth request extension header and the uplink data burst and transmit the bandwidth request extension header and the uplink data burst.

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