KR20170020695A - Method and apparatus for fast access, and method for supporting fast access in communication system - Google Patents

Abstract

A terminal of a communication system transmits a first signal through an uplink dedicated channel allocated in a first radio resource based on a first transmission time interval (TTI) having a first time length at a first step for uplink access. If the terminal can operate based on a second TTI having a second time length shorter than the first time length, uplink data is transmitted after the remaining steps for uplink access are performed by using a second radio resource based on the second TTI from a base station. So, fast access can be possible.

Description

TECHNICAL FIELD [0001] The present invention relates to a fast access method and apparatus in a communication system, and a fast access support method.

The present invention relates to a fast access method and apparatus in a communication system and a quick access support method, and more particularly, to a fast access method using two transmission time intervals (TTIs) having different time lengths And to a method and apparatus for making the same.

In a communication system composed of at least one terminal and a base station, when data is transmitted from the terminal to the base station or from the base station to the terminal, the data is finally transmitted from the terminal to the transmission buffer of the terminal or the base station to the base station or terminal (5G, 5-th Generation) communication has been mentioned as a technology to reduce the latency to the point of time.

Specifically, according to the document on the vision of 5G mobile communications agreed in ITU-R in June 2015, it is assumed that one of the eight key performance indicators is determined as latency, It seems to be a key issue.

Accordingly, studies are underway to reduce the TTI (Transmission Time Interval). The TTI is a minimum transmission time interval in which a terminal or a base station transmits data. For example, a TTI is 5 ms for a mobile WiMAX communication system based on IEEE 802.16e, and a LTE (Long) based on 3GPP Release 8 to Release 12 Term Evolution) and LTE-A (Advanced) communication systems, the TTI is 1 ms.

Most communication systems should consider backward compatibility in reducing TTI. When a new TTI having a shorter time length than a normal TTI is defined as a short TTI (Short TTI), the TTI of the existing communication system is defined as a normal TTI, The terminal supporting only the normal TTI of the mobile station should be able to access.

A base station of a communication system supporting a short TTI must have a radio resource based on a normal TTI in order to support past compatibility, in addition to radio resources based on a short TTI.

In current communication systems, all carriers have radio resources based on the same TTI, even though the base station has one or more carriers. Therefore, when a communication system has a heterogeneous TTI, considering various system design considerations such as an impact on the existing communication system, system overhead, increase in terminal and base station complexity due to a new physical channel design There has not been proposed a technique for efficiently using radio resources of a short TTI in order to reduce the delay time.

A problem to be solved by the present invention is to provide a quick access method and apparatus and a quick access support method in a communication system that enables quick access through reduction of delay time.

According to an embodiment of the present invention, a fast uplink access method for transmitting data at a terminal of a communication system is provided. In a fast access method, in a first step for uplink access, a first signal is transmitted through an uplink dedicated channel allocated in a first radio resource based on a first TTI (Transmission Time Interval) having a first time length If the UE can operate based on a second TTI having a second time length shorter than the first time length, transmitting the uplink access using the second radio resource based on the second TTI from the base station, Performing the remaining steps for transmitting the uplink data, and transmitting the uplink data.

The first signal may be a bandwidth request signal, and the uplink dedicated channel may be a bandwidth request channel.

The first signal may be a BSR (Buffer Status Report) signal, and the uplink dedicated channel may be an uplink shared traffic channel.

Wherein the step of transmitting the first signal includes the steps of resetting a flag of 1 bit included in the first signal when the terminal operates based on the first TTI, And if so, setting a flag of 1 bit included in the first signal.

The first signal may be a random access preamble signal, and the uplink dedicated channel may be a random access dedicated channel.

Wherein the step of transmitting the first signal comprises the steps of transmitting, when the terminal operates based on the first TTI, a first random access preamble among the plurality of first random access preambles as the first signal, And transmitting the first random access preamble as the first signal among the plurality of second random access preambles when the UE operates based on the second TTI.

Wherein the step of performing the remaining steps comprises the steps of: receiving a random access response transmitted by the base station, which has received the second random access preamble, using the second radio resource; Report), and receiving an uplink resource use grant message including uplink resource allocation information transmitted by the base station using the second radio resource.

Wherein the step of performing the remaining steps comprises: transmitting a random access response each transmitted by the base station using the first radio resource and the second radio resource; when the terminal operates based on the second TTI, Receiving a random access response transmitted by a base station using the second radio resource, transmitting a BSR (Buffer Status Report) using the second radio resource, and transmitting the BSR using the second radio resource And transmitting an uplink resource utilization grant message including the uplink resource allocation information.

According to another embodiment of the present invention, a method for supporting fast uplink access of a terminal to a base station of a communication system is provided. The fast access support method comprises the steps of transmitting, in a first step for the uplink access, a signal transmitted from the terminal through an uplink dedicated channel allocated in a first radio resource based on a first TTI (Transmission Time Interval) Receiving a first radio signal based on the second TTI when the UE is capable of operating based on a second TTI having a second time length shorter than the first time length; Performing the remaining steps for the uplink access, and receiving uplink data transmitted from the terminal.

The performing the remaining steps may include determining from the first signal whether the terminal is a terminal operating on the first TTI or a terminal capable of operating on the second TTI.

The first signal may be a random access preamble, and the uplink dedicated channel may be a random access dedicated channel.

Wherein the step of receiving the first signal comprises the step of the UE operating on the first TTI transmitting the first random access preamble as the first signal among the plurality of first random access preambles, May include transmitting a first random access preamble among the plurality of second random access preambles as the first signal.

Performing the remaining steps comprises transmitting a random access response for the random access preamble using the first radio resource and the second radio resource, and transmitting the random access response for the random access preamble from the terminal to the BSR (Buffer Status Report), it may be determined that the terminal is a terminal capable of operating based on the second TTI.

The first signal may be a bandwidth request signal, and the uplink dedicated channel may be a bandwidth request channel.

The checking step may include discriminating whether the terminal is operating on the first TTI or on the second TTI, allocating a bandwidth request signal to be used by the terminal, And determining whether the terminal is capable of operating based on the second TTI based on the bandwidth request signal received from the terminal.

The first signal may be a BSR (Buffer Status Report) signal, and the uplink dedicated channel may be an uplink shared traffic channel.

Wherein the confirming comprises determining that the terminal can operate based on the second TTI if the flag value of the BSR is set and if the flag value of the BSR is reset, And determining to operate based on the first TTI.

According to another embodiment of the present invention, a fast uplink access device for transmitting data by a terminal in a communication system is provided. A quick access device includes a processor and a transceiver. Wherein the processor performs a first step of an uplink access procedure through an uplink dedicated channel allocated in a first radio resource based on a first transmission time interval (TTI) having a first time length, If it is possible to operate based on a second TTI having a second time length shorter than the one-hour length, performs a final data transmission step from the second step using a second radio resource based on the second TTI from the base station . The transceiver is connected to the processor, and transmits / receives a radio signal according to the uplink access procedure to / from the base station.

In the first step, the processor may transmit one of a random access preamble, a bandwidth request signal, and a buffer status report (BSR) through the transceiver.

The processor may inform the base station through the random access preamble, the bandwidth request signal, and the BSR that the UE can operate based on the second TTI in the first step.

According to the embodiment of the present invention, in a communication system having radio resources based on two TTIs (Transmission Time Intervals) having different time lengths, in an uplink access procedure required for a UE to transmit data to a base station, Time TTI is performed using a radio resource based on a TTI having a shorter time length, thereby enabling faster access through reduction of latency as compared with the case of using a radio resource based on a TTI having a longer time length.

Also, the first step in the uplink access procedure is to use the physical channel designed for the radio resource based on the long TTI among the two TTIs, and perform the first step using radio resources based on the short TTI A new physical channel designed for radio resources based on a short TTI is needed. Therefore, it is possible to eliminate the system overhead, the complexity of the design, and the increase in the product cost required for adopting a new physical channel designed for radio resources based on a short TTI.

Also, even if the first stage is a communication system capable of performing in a short TTI-based radio resource, it is possible to perform the first stage in a radio resource based on a long TTI and a radio resource based on a short TTI from a second stage , It is possible to distribute the load of radio resources based on the short TTI required for the first step.

FIG. 1 is a diagram conceptually illustrating radio resources of a communication system according to an embodiment of the present invention, according to types of TTIs.
2 is a diagram illustrating an example of a radio resource of a heterogeneous TTI according to a subframe structure of a communication system according to an embodiment of the present invention.
3 is a diagram illustrating a random access method using a PRACH in a conventional LTE and LTE-A communication system.
4 is a diagram illustrating a random access method in a communication system having a heterogeneous TTI-based radio resource according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an example of a method of using a short TTI-based radio resource from step 2 in the random access method shown in FIG.
FIG. 6 is a diagram illustrating another example of a method for enabling a terminal capable of operating based on a short TTI in the random access method shown in FIG. 4 to use short TTI-based radio resources from step 2. FIG.
7 is a diagram illustrating a connection method by SR (Scheduling Request) using a PUCCH in a conventional LTE and LTE-A system.
8 is a diagram illustrating an uplink access method using a dedicated bandwidth request channel in a communication system having a heterogeneous TTI-based radio resource according to an embodiment of the present invention.
9 is a diagram illustrating a connection method using a BSR (Buffer Status Report) in a conventional LTE and LTE-A communication system.
10 is a diagram illustrating a connection method using a BSR in a communication system having heterogeneous TTI-based radio resources according to an embodiment of the present invention.
11 is a diagram illustrating a quick access device of a terminal according to an embodiment of the present invention.
12 is a diagram illustrating a fast access support apparatus for a base station according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification and claims, when a section is referred to as "including " an element, it is understood that it does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station (HR- A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) , HR-MS, SS, PSS, AT, UE, and the like.

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, ), An access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, a relay station (RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, a high reliability relay station (HR- A femto BS, a home Node B, a home eNodeB, a pico BS, a metro BS, a micro BS, Etc.) or all or some of the ABS, Node B, eNodeB, AP, RAS, BTS, MMR-BS, RS, RN, ARS, HR- There's also an included feature.

Now, a fast access method and apparatus and a fast access support method in a communication system according to an embodiment of the present invention will be described in detail with reference to the drawings.

When a communication system has both a short TTI-based radio resource and a normal TTI-based radio resource, the communication system defines that it has heterogeneous TTIs. Here, the normal TTI and the short TTI are not divided by the absolute time length criterion but are a relative concept determined by comparing the time lengths of the two TTIs.

A carrier having both normal TTI-based radio resources and short TTI-based radio resources in a carrier is defined as a carrier with heterogeneous TTIs, and a carrier having only normal TTI-based radio resources in a carrier is defined as a normal TTI carrier with only normal TTI), and a carrier having only a short TTI-based radio resource in the carrier is defined as a short TTI carrier.

A communication system with heterogeneous TTI-based radio resources according to an embodiment of the present invention is applied to all cases belonging to two categories, using definitions of heterogeneous TTI carriers, normal TTI carriers, and short TTI broadcast waves.

Assuming that the number of carriers used by the communication system is N (N is a natural number equal to or greater than 1), Class 1 is N = 1, and Class 2 is N> 1.

In the case of Classification 1, the communication system uses one carrier and the carrier is a heterogeneous TTI carrier.

In case of Class 2, the communication system may use J heterogeneous TTI carriers, K normal TTI carriers, and L short TTI carriers. At this time, J? 0, K? 0, L? 0, and J + K + L = N.

For example, for example, there may be two carriers used by the communication system, one of which is a normal TTI carrier and the other carrier is a short TTI carrier file. This case corresponds to N = 2, J = 0, K = 1, and L = 1 in classification 2.

In addition, there are two carriers used by the communication system, one of which is a heterogeneous TTI carrier, and the other carrier is a normal TTI carrier file. This case corresponds to N = 2, J = 1, K = 1, and L = 0 in classification 2.

One example of the case where the communication system has a plurality of carriers is a method such as Carrier Aggregation (CA) or Dual Connectivity of an LTE or LTE-A communication system based on the 3GPP standard, or a method such as IEEE 802.16 And a multicarrier operation of a mobile WiMAX system based on a series standard.

FIG. 1 is a diagram conceptually illustrating radio resources of a communication system according to an embodiment of the present invention, according to types of TTIs.

Referring to FIG. 1, the entire radio resources of the communication system can be divided into normal TTI-based radio resources and short TTI-based radio resources. At this time, the region of the normal TTI-based radio resource and the region of the short TTI-based radio resource shown in FIG. 1 do not represent the relative ratio of the physical resource amount.

FIG. 2 is a diagram illustrating an example of a radio resource of a heterogeneous TTI according to a subframe structure of a communication system according to an embodiment of the present invention. FIG. 2 illustrates a 3GPP LTE or LTE-A communication system of a frequency division duplex (FDD) And a normal TTI having a length of 1 ms and a short TTI having a length of 0.5 ms are shown in the uplink subframe.

Referring to FIG. 2, normal TTI-based radio resources and short TTI-based radio resources in the uplink subframe can be alternately allocated based on the frequency axis. The carrier having the uplink subframe structure corresponds to a heterogeneous carrier having both normal TTI-based radio resources and short TTI-based radio resources.

Also, as shown in FIG. 2, radio resources for the UEs UE1, UE2, and UE3 are allocated in the normal TTI-based radio resources and the short TTI-based radio resources. For example, some of the normal TTI-based radio resources may be allocated to the UE1 and some of the short TTI-based radio resources may be allocated to the UEs UE2 and UE3.

An uplink access scheme for transmitting data to a base station in a communication system varies. For example, in the LTE system, a random access method using PRACH (Physical Random Access Channel), a method using SR (Scheduling Request) using PUCCH (Physical Uplink Control Channel), a BSR Report), Semi-persistent scheduling (SPS), and pre-allocation.

3 is a diagram illustrating a random access method using a PRACH in a conventional LTE and LTE-A communication system.

Referring to FIG. 3, the UE 100 transmits a random access preamble through the PRACH (step 1, S310).

Upon receiving the random access preamble, the base station 200 transmits RAR (Random Access Response) in response to the random access preamble (Step 2, S320).

The terminal 100 receiving the RAR transmits an L2 (Layer 2) or L3 message (Step 3, S330). Hereinafter, it is assumed that the BSR is transmitted in the L2 message.

The base station 200 transmits a grant (Grant), which is an uplink resource use grant message, to the received BSR to the UE (steps 4 and S340).

Thereafter, the terminal 100 transmits data using the allocated uplink resources (step 5, S350).

This random access method is essentially the same as the random access of mobile WiMAX. In the mobile WiMAX communication system, a ranging code is transmitted in step 1 (S310), a MAP message is used in step 2 (S320), and a bandwidth request message is transmitted in step 3 (S330) In step 4 (S340), uplink resources are allocated through the MAP message. Finally, uplink data is transmitted in step 5 (S350). Also, the LTE / LTE-A communication system or the mobile WiMAX communication system uses a dedicated uplink channel in step 1 (S310).

In the conventional LTE and LTE-A communication systems, the random access method using the PRACH is performed using normal TTI-based radio resources.

In order to support past compatibility in a communication system having heterogeneous TTI-based radio resources according to an embodiment of the present invention, a random access dedicated channel based on a normal TTI must exist.

However, in a communication system having a heterogeneous TTI-based radio resource, a short TTI-based random access dedicated channel may not exist in the communication system for the following reason or other reasons. The resource used for the dedicated uplink channel for the first step S310 serves as an overhead of the communication system. This is because even if the load of the random access channel is low for a moment, the amount of resources used for the random access dedicated channel is not changed dynamically. Therefore, in the system overhead, if there is a random access dedicated channel based on the normal TTI, a random access dedicated channel based on a short TTI may not exist in the communication system.

Also, in designing / implementing a communication system having a heterogeneous TTI-based radio resource, the complexity of the design required for a new random access dedicated channel designed for short TTI resources, and the increase in the product unit price due to the complexity of the product can be caused. Therefore, if there is a random access dedicated channel based on normal TTI, a random access dedicated channel based on short TTI may not exist in the communication system.

In addition, a communication system having a heterogeneous TTI-based radio resource may not have a random-access dedicated channel based on a short TTI for various reasons.

Also, in a communication system having a heterogeneous TTI-based radio resource, even if there is a random access dedicated channel based on a short TTI, a terminal capable of operating based on a short TTI for various reasons may perform normal TTI in step 1 (S310) Based random access channel. As an example, if a terminal capable of operating based on a short TTI has a high load on a random access channel based on a short TTI and a random access failure probability is very high, a random access dedicated channel based on a normal TTI can be used.

In addition, even if there is a random access dedicated channel based on a short TTI in a communication system having a heterogeneous TTI-based radio resource for various reasons, the UE can use a random access dedicated channel based on the normal TTI in step 1 (S310) of the random access procedure .

In order to perform the random access procedure in the communication system having the heterogeneous TTI-based radio resources according to the embodiment of the present invention, the random access channel based on the normal TTI is used in step 1, Explains in detail how to use resources.

4 is a diagram illustrating a random access method in a communication system having a heterogeneous TTI-based radio resource according to an embodiment of the present invention.

4, the left terminal 100 and the right terminal 100 are shown on the basis of the base station 200. However, the left terminal 100 and the right terminal 100 are not the other terminals but the same terminal, And to distinguish between using a normal TTI-based radio resource and using a short TTI-based radio resource.

Referring to FIG. 4, the UE 100 transmits a random access preamble using a dedicated random access channel based on a normal TTI (steps 1 and S410). The random access dedicated channel may mean PRACH for existing LTE and LTE-A communication systems.

After step 1 (S410), the terminal 100 and the base station 200 may perform steps 2 to 5 using short TTI-based radio resources (S420 to S450).

As described above, in the communication system having heterogeneous TTI-based radio resources, since the short TTI-based radio resources are used in the steps 2 to 5 (S420 to S450), the processing time in the terminal 100 and the base station 200 is the normal TTI Based radio resource, the delay time required for data transmission is reduced, and quick connection is possible.

FIG. 5 is a diagram illustrating an example of a method of using a short TTI-based radio resource from step 2 in the random access method shown in FIG.

Referring to FIG. 5, the UE 100 transmits a random access preamble using a random access dedicated channel based on a normal TTI (steps 1 and S510).

After Step 1 (S510), the terminal 100 and the base station 200 perform Step 2 to Step 5 using short TTI-based radio resources (S520 to S550).

In order to use short TTI-based radio resources from step 2 (S520), a terminal capable of using a short TTI-based radio resource, that is, a terminal 100 capable of operating based on a short TTI, In step S510, the base station 200 receiving the random access preamble transmitted using the random access dedicated channel based on the normal TTI transmits the RAR in response to the random access preamble using short TTI-based radio resources and normal TTI- (S520, S520 '). At this time, the base station 200 may transmit the RAR using a short TTI-based radio resource and a normal TTI-based radio resource at the same time, but may transmit the RAR at another time.

After step 2 (S520, S520 '), the base station 200 transmits a response signal for a signal received in the normal TTI-based radio resource using the normal TTI-based radio resource, and transmits the signal received in the short TTI- The response signal is transmitted using a short TTI-based radio resource.

That is, the terminal 100 capable of operating based on the short TTI monitors only the short TTI-based radio resources after performing step 1 (S510), so that the base station 200 uses the short TTI- (RAR) transmitted in step S520. Therefore, the terminal 100 capable of operating based on the short TTI can perform the step 2 (S520) to the step 5 (S550) using the short TTI-based radio resource.

In the case where the terminal 100 operates on the normal TTI, only the normal TTI-based radio resources are available. Therefore, only the normal TTI-based radio resources are monitored after the step 1 (S510) ) May receive only the RAR that is transmitted using the normal TTI-based radio resource in step 2 (S520). Accordingly, the UE operating on the normal TTI can perform all operations from the RAR reception, the BSR transmission, the grant reception, and the data transmission based on the normal TTI. In FIG. 5, the terminal 100 is a terminal operating based on a short TTI.

As described above, the communication system having the heterogeneous TTI-based radio resources according to the embodiment of the present invention is configured such that the terminal 100 capable of operating on the short TTI guarantees the operation of the terminal operating on the normal TTI, S520) to use a short TTI-based radio resource until all operations are completed. In this way, compared to the uplink access procedure using normal TTI-based radio resources, the connection time required until the final data transmission is shortened.

FIG. 6 is a diagram illustrating another example of a method for enabling a terminal capable of operating based on a short TTI in the random access method shown in FIG. 4 to use short TTI-based radio resources from step 2. FIG.

In the existing communication system, a plurality of terminals 100 share a physical signal transmitted by the terminal 100 using a random access channel in step 1, with X being a natural number (X is a natural number greater than 0). The terminal 100 attempting random access selects one of the X physical signals and transmits the selected one in step 1. For example, in the LTE / LTE-A communication system, the terminal 100 selects one of 64 random access preambles and transmits it in step 1.

At this time, in order to use the short TTI-based radio resource from step 2, in the embodiment of the present invention, when the terminal operating on the normal TTI has a total of X usable physical signals in step 1, The terminal that can perform the processing in step 1 separately defines the usable physical signals. That is, for a terminal capable of operating based on a short TTI, a terminal operating on a normal TTI defines a physical signal different from a usable physical signal in step 1 (Y is a natural number greater than 0). Therefore, a mobile station that can operate based on a short TTI selects one of Y physical signals and transmits the selected physical signals in step 1. For example, in the LTE / LTE-A communication system, all 64 random access preambles are available in step 1. The existing 64 random access preambles are used only by the terminal operating on the normal TTI. For a terminal capable of operating on a short TTI, 64 random access preambles and Y random access preambles are defined, and a terminal capable of operating based on a short TTI uses an additional Y random access preamble do.

Referring to FIG. 6, a UE 100 capable of operating based on a short TTI selects one random access preamble among the Y random access preambles using a random access dedicated channel based on a normal TTI and transmits the selected random access preamble ( Step 1, S610).

If the received random access preamble is one of the X random access preambles, the base station 200 transmits the RAR as a normal TTI-based radio resource (step 2, S620 '). Otherwise, if the received random access preamble is one of the additional Y random access preambles, the base station 200 transmits the RAR as a short TTI-based radio resource (step 2, S620).

After step 2 (S620 ', S620), the base station 200 transmits a response signal to a signal received in the normal TTI-based radio resource using the normal TTI-based radio resource, and transmits the signal received in the short TTI- The response signal is transmitted using short TTI-based radio resources.

6, in performing step 2 (S620, S620 '), the method illustrated in FIG. 6 differs from that of FIG. 5 in that the base station 200 uses a single TTI-based radio resource or a short TTI- Transfer differentiation.

The terminal 100 capable of operating based on the short TTI monitors only the short TTI-based radio resources after performing step 1 (S610), so that the base station 200 uses the short TTI- Lt; RTI ID = 0.0 > RAR < / RTI > Accordingly, the terminal 100 capable of operating based on the short TTI can perform the step 2 (S620) to the step 5 (S650) using the short TTI-based radio resource.

Since the terminal operating based on the normal TTI uses only the normal TTI-based radio resources, the base station 200 monitors only normal TTI-based radio resources after performing step 1 (S610) It is possible to receive only RARs transmitted using TTI-based radio resources. Accordingly, the UE operating on the normal TTI can perform all subsequent operations using the normal TTI-based radio resources.

In this manner, the base station 200 determines whether to use the normal TTI-based radio resource or the short TTI-based radio resource by using the random access preamble transmitted by the terminal 100, And the terminal capable of operating based on the short TTI can use the short TTI based radio resource from the step 2 (S620) to the end of all the operations.

7 is a diagram illustrating a connection method by SR (Scheduling Request) using a PUCCH in a conventional LTE and LTE-A system.

7, if there is an active connection between the terminal 100 and the base station 200 and there is an SR signal uniquely assigned to the terminal 100, the terminal 100 transmits the SR signal to the terminal 100 through the PUCCH, (Step 1, S710).

The base station 200 transmits a grant, which is an uplink resource use permission, to the received SR to the terminal (step 2, S720).

Thereafter, the terminal 100 transmits data using the allocated uplink resources (step 3, S730).

The SR-based uplink access method using the PUCCH shown in FIG. 7 is essentially the same as the uplink access method using the BR code (bandwidth request code) of the mobile WiMAX communication system. In the mobile WiMAX communication system, the BR code is transmitted in step 1 (S710), the uplink resource is allocated in step 2 (S720) through the MAP, and finally the uplink data is transmitted in step 3 (S730). In addition, the LTE / LTE-A communication system or the mobile WiMAX communication system commonly use a dedicated bandwidth request channel in step 1 (S710).

In the embodiment of the present invention, in the uplink access procedure using a dedicated bandwidth request channel in a communication system having a heterogeneous TTI-based radio resource, a dedicated bandwidth request channel based on normal TTI is used in step 1 (S710) , And a method using short TTI-based radio resources is presented from the following step 2 (S720).

8 is a diagram illustrating an uplink access method using a dedicated bandwidth request channel in a communication system having a heterogeneous TTI-based radio resource according to an embodiment of the present invention.

Unlike the above-mentioned random access, in the uplink access procedure using a dedicated bandwidth request channel, the bandwidth request signal used in step 1 is transmitted to each terminal through separate signaling between the terminal 100 and the base station 200 Are uniquely assigned. The bandwidth request signal means SR in the existing LTE and LTE-A systems, and BR code in the mobile WiMAX communication system.

The base station 200 can determine whether the terminal is a terminal capable of operating based on a short TTI or a terminal operating based on a normal TTI when an arbitrary terminal is initially connected to the base station and registered. Based on this, when the base station 200 uniquely allocates the bandwidth request signal to the terminal 100, the terminal 100 determines whether the terminal 100 can operate based on the normal TTI or the short TTI And stores the type of the terminal 100 for each bandwidth request signal.

Referring to FIG. 8, the MS 100 transmits an SR to the BS 200 using a normal TTI-based bandwidth request channel dedicated to a radio resource (steps S 1 and S 810).

The base station 200 determines whether the terminal 100 can operate based on the normal TTI or the short TTI based on the received SR. The base station 200 can confirm whether the terminal 100 can operate based on the normal TTI or the short TTI based on the type of the terminal 100 according to the stored bandwidth request signal.

If the received SR is the SR of the terminal 100 that can operate based on the short TTI, the base station 200 transmits the grant using the short TTI-based radio resource (step 2, S820). Alternatively, if the received SR is an SR of a terminal operating on the normal TTI, the grant is transmitted using the normal TTI-based radio resource.

The terminal 100 capable of operating based on the short TTI monitors only the short TTI-based radio resources after performing step 1 (S810), so that the base station 200 uses the short TTI- ) To receive the grant. Therefore, the terminal 100 capable of operating based on the short TTI can perform all the operations from step 2 (S820) using short TTI-based radio resources.

On the other hand, the UE operating based on the normal TTI monitors only the normal TTI-based radio resources after performing step 1 (S810), thereby receiving the grant transmitted in step 2 using the normal TTI- And all subsequent operations can be performed using normal TTI-based radio resources.

In this way, when a communication system having a heterogeneous TTI-based radio resource performs an uplink access procedure using a dedicated bandwidth request channel, it performs an operation based on a short TTI while ensuring the operation of a terminal operating on a normal TTI The UE can perform all the operations from step 2 (S820) using short TTI-based radio resources. In this way, compared to the uplink access procedure using normal TTI-based radio resources, the connection time required until the final data transmission is shortened.

9 is a diagram illustrating a connection method using a BSR (Buffer Status Report) in a conventional LTE and LTE-A communication system.

9, when there is an active connection between the MS 100 and the BS 200 and there is a Physical Uplink Shared Channel (PUSCH) resource allocated to the MS 100, the MS 100 transmits the allocated PUSCH (Medium Access Control) layer using a resource (step 1, S910).

The base station 200 transmits a grant, which is an uplink resource use permission, to the received BSR to the terminal 100 (step 2, S920).

Thereafter, the UE 100 transmits data using the allocated uplink resources (step 3, S930).

The uplink access method using the BSR shown in FIG. 9 is essentially the same as the access method using the BR header (bandwidth request header) of the mobile WiMAX communication system. In the mobile WiMAX communication system, the BR header is transmitted in step 1 (S910). In step 2 (S920), uplink resources are allocated through the MAP. Finally, in step 3 (S930), uplink data is transmitted. Also, the LTE / LTE-A communication system or the mobile WiMAX communication system uses an uplink shared traffic channel used for transmitting uplink traffic of the UEs in step 1 (S910). And the uplink shared traffic channel means PUSCH in case of LTE.

In a communication system having a heterogeneous TTI-based radio resource according to an embodiment of the present invention, in performing an uplink access procedure using BSR, which is a bandwidth request message of the MAC layer, step 1 (S910) Traffic channel is used, and from step 2 (S920) thereafter, a method using short TTI based radio resources is proposed.

10 is a diagram illustrating a connection method using a BSR in a communication system having heterogeneous TTI-based radio resources according to an embodiment of the present invention.

In a communication system having a heterogeneous TTI-based radio resource, a 1-bit flag is used for the BSR to distinguish whether the terminal can operate based on a short TTI or a terminal that operates based on a normal TTI.

Referring to FIG. 10, a UE 100 capable of operating based on a short TTI sets a flag of 1 bit in the BSR and transmits the 1-bit flag to the base station 200 via the PUSCH (steps 1 and S1010). Meanwhile, the terminal 100 operating on the normal TTI can reset the 1-bit flag to the BSR and transmit it to the base station 200 via the PUSCH. For example, a terminal 100 capable of operating based on a short TTI sets a 1-bit flag to 1 in the BSR and transmits it to the base station 200, and a terminal capable of performing only normal TTI- The flag of 1 bit can be reset to 0 and transmitted to the base station 200.

When the flag value of the received BSR is set, the base station 200 transmits the grant to the terminal 100 using the short TTI-based radio resource (step 2, step S 1020). Alternatively, when the flag value of the BSR is reset, the base station 200 transmits the grant to the UE 100 using the normal TTI-based radio resource.

The terminal 100 capable of operating based on the short TTI monitors only the short TTI-based radio resources after performing step 1 (S1010) so that the base station 200 receives the grant transmitted from the short TTI-based radio resource . Therefore, the terminal 100 capable of operating based on the short TTI can perform all the operations from the step 2 (S1020) using short TTI-based radio resources.

On the other hand, the terminal 100 operating based on the normal TTI monitors only the normal TTI-based radio resources after performing step 1 (S1010), so that the base station 200 can receive the grant transmitted from the normal TTI- have. Accordingly, the MS 100 operating on the normal TTI can perform all operations from the step 2 using the normal TTI-based radio resources.

In this way, a communication system having a heterogeneous TTI-based radio resource is capable of performing uplink access using the BSR of the MAC layer, and a terminal operating on a short TTI while ensuring operation of a terminal operating on a normal TTI From step 2 (S1020), all operations can be performed using short TTI-based radio resources. In this way, compared to the uplink access procedure using normal TTI-based radio resources, the connection time required until the final data transmission is shortened.

11 is a diagram illustrating a quick access device of a terminal according to an embodiment of the present invention.

11, the quick access device 1100 of the terminal 100 includes a processor 1110, a transceiver 1120, and a memory 1130.

The processor 1110 performs the uplink connection operation and functions of the terminal 100 illustrated in FIGS. 4, 5, 6, 8, and 10. FIG. Processor 1110 performs step 1 of the UL procedure using an uplink dedicated channel allocated to a normal TTI-based radio resource, and when the UE 100 can operate based on a short TTI, From the step 2 to the transmission of the final data. Meanwhile, the processor 1110 performs normal TTI based radio resources from the step 2 of the uplink access procedure to the final transmission of data when the terminal 100 operates based on the normal TTI.

The transceiver 1120 is connected to the processor 1110 and transmits and receives a radio signal for uplink connection with the base station 200.

Memory 1130 is coupled to processor 1110 and stores various information related to the operation of processor 1110. [

12 is a diagram illustrating a fast access support apparatus for a base station according to an embodiment of the present invention.

12, the quick access support device 1200 of the base station 200 includes a processor 1210, a transceiver 1220, and a memory 1230.

The processor 1210 performs operations and functions of the base station 200 for the uplink connection of the terminal 100 illustrated in Figs. 4, 5, 6, 8, and 10. The processor 1210 determines whether the terminal 100 operates based on the short TTI or the normal TTI and if the terminal 100 can operate based on the short TTI, The mobile station 100 uses the short TTI-based radio resource and uses the normal TTI-based radio resource from the step 2 of the uplink access procedure when the UE 100 operates based on the normal TTI.

The transceiver 1220 is connected to the processor 1210 and transmits and receives a radio signal for the uplink connection with the base station 200.

Memory 1230 is coupled to processor 1210 and stores various information related to the operation of processor 1210. [ The memory 1230 may store the type of the terminal indicating whether the terminal 100 operates based on the normal TTI or the terminal capable of operating based on the short TTI.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, Such an embodiment can be readily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (20)

A fast uplink access method for transmitting data in a terminal of a communication system,
Transmitting a first signal over an uplink dedicated channel allocated in a first radio resource based on a first transmission time interval (TTI) having a first time length in a first step for an uplink access,
If the UE can operate based on a second TTI having a second time length shorter than the first time length, transmitting the remaining TTI for the uplink access using a second radio resource based on the second TTI, Performing the steps, and
Transmitting uplink data
Lt; / RTI > The method of claim 1,
The first signal is a bandwidth request signal,
Wherein the uplink dedicated channel is a bandwidth request channel. The method of claim 1,
The first signal is a BSR (Buffer Status Report) signal,
Wherein the uplink dedicated channel is an uplink shared traffic channel. 4. The method of claim 3,
The step of transmitting the first signal
Resetting a 1-bit flag included in the first signal when the terminal operates based on the first TTI; and
And setting a flag of 1 bit included in the first signal when the terminal operates based on the second TTI. The method of claim 1,
The first signal is a random access preamble signal,
Wherein the uplink dedicated channel is a random access dedicated channel. The method of claim 5,
The step of transmitting the first signal
Transmitting, by the first signal, a first random access preamble from among a plurality of first random access preambles when the UE operates based on the first TTI; and
And transmitting the first random access preamble as the first signal among the plurality of second random access preambles when the terminal operates based on the second TTI. The method of claim 5,
The step of performing the remaining steps
Receiving a random access response transmitted by the base station, which has received the second random access preamble, using the second radio resource;
Transmitting a BSR (Buffer Status Report) using the second radio resource, and
And receiving an uplink resource use grant message including uplink resource allocation information transmitted by the base station using the second radio resource. The method of claim 5,
The step of performing the remaining steps
Transmitting a random access response each transmitted by the base station using the first radio resource and the second radio resource,
Receiving a random access response transmitted by the base station using the second radio resource when the mobile station operates based on the second TTI;
Transmitting a BSR (Buffer Status Report) using the second radio resource, and
And transmitting an uplink resource use grant message including uplink resource allocation information transmitted by the base station using the second radio resource. A method for supporting fast uplink access by a base station in a communication system,
In a first step for the uplink access, a first signal transmitted from the UE through an uplink dedicated channel allocated in a first radio resource based on a first TTI (Transmission Time Interval) having a first time length, Receiving,
When the UE can operate based on a second TTI having a second time length shorter than the first time length, the remaining steps for the uplink access using the second radio resource based on the second TTI, Performing steps, and
Receiving uplink data transmitted from the terminal
The method comprising the steps of: The method of claim 9,
Wherein performing the remaining steps comprises determining from the first signal whether the terminal is a terminal operating on the first TTI or a terminal capable of operating on the second TTI, . 11. The method of claim 10,
Wherein the first signal is a random access preamble,
Wherein the uplink dedicated channel is a random access dedicated channel. 11. The method of claim 10,
The step of receiving the first signal
The UE operating on the first TTI transmits a first random access preamble among the plurality of first random access preambles as the first signal,
And transmitting, by the terminal operating on the second TTI, one second random access preamble among the plurality of second random access preambles as the first signal. The method of claim 9,
The step of performing the remaining steps
Transmitting a random access response for the random access preamble using the first radio resource and the second radio resource, respectively; and
Receiving a BSR (Buffer Status Report) from the UE using the second radio resource; and determining that the UE is a UE capable of operating based on the second TTI. 11. The method of claim 10,
The first signal is a bandwidth request signal,
Wherein the uplink dedicated channel is a bandwidth request channel. The method of claim 14,
The verifying step
Determining whether the terminal is operating on the first TTI or on the second TTI;
Allocating a bandwidth request signal to be used by the terminal, and
And determining from the bandwidth request signal received from the terminal whether the terminal is capable of operating based on the second TTI. 11. The method of claim 10,
The first signal is a BSR (Buffer Status Report) signal,
Wherein the uplink dedicated channel is an uplink shared traffic channel. 17. The method of claim 16,
The verifying step
If the flag value of the BSR is set, determining that the terminal can operate based on the second TTI; and
And if the flag value of the BSR is reset, determining that the terminal operates based on the first TTI. A fast uplink access device for a terminal to transmit data in a communication system,
A first step of an uplink access procedure through an uplink dedicated channel allocated in a first radio resource based on a first transmission time interval (TTI) having a first time length, A processor for performing a final data transmission step from a second step using a second radio resource based on the second TTI from a base station when the base station can operate based on a second TTI having a shorter second time length,
A transceiver connected to the processor and transmitting / receiving a radio signal according to the uplink access procedure to /
Lt; / RTI > The method of claim 18,
Wherein the processor transmits one of a random access preamble, a bandwidth request signal, and a buffer status report (BSR) through the transceiver in the first step. 20. The method of claim 19,
Wherein the processor informs the base station through the random access preamble, the bandwidth request signal, and the BSR of information that the terminal can operate based on the second TTI in the first step.

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