KR101865074B1 - Random access method and device in a mobile communication system - Google Patents

Abstract

A random access method of a user equipment (UE) in a mobile communication system, the method comprising the steps of: the user terminal giving priority to at least two random access signals; And transmitting at least two priority random access signals,
According to another aspect of the present invention, there is provided a random access method of a user equipment (UE) in a mobile communication system, the method including transmitting at least two random access signals to at least two communication devices,
According to another aspect of the present invention, there is provided a random access method of a user equipment (UE) in a mobile communication system, the method comprising: transmitting at least one random access signal to the user equipment; And performing random access control by selecting some or all of at least two random access response signals received in response to the at least one random access signal,
The present invention also provides a random access device of a user equipment (UE) in a mobile communication system, and includes a multi-device random access controller for controlling at least two communication devices to transmit at least one random access signal.

Description

Technical Field [0001] The present invention relates to a random access method and apparatus in a mobile communication system,

The present invention relates to a random access method and apparatus in a mobile communication system.

The mobile communication system has been actively studied to provide services having a high quality of service (QoS) to a user equipment (UE) . Typical examples of the mobile communication system include an LTE (Long Term Evolution) mobile communication system and a 3GPP2 (Third Generation Partnership) system based on a Code Division Multiple Access (CDMA) (Hereinafter referred to as " 3GPP2 mobile communication system "), a Wideband Code Division Multiple Access (WCDMA) (Hereinafter referred to as 3GPP mobile communication system) using a 3GPP (Third Generation Partnership Project) standard and a WiMAX Forum Network Working Group standard WiMAX mobile communication system, IEEE (Institute of Electrical and Electronics Engineers) 802.16m communication system, and the like.

The conventional random access method is a contention-based random access method in which a RACH is arbitrarily allocated according to a RACH allocation scheme to compete with other UEs. When the contention-based random access method is used, Performs a random access using an access channel (RACH: Random Access Channel)

However, in the conventional contention-based random access method using one random access channel, since all UEs attempting random access use only one random access channel, the network access success probability Are the same.

Therefore, it is difficult to provide a satisfactory service because a UE requiring a relatively fast network access, such as a UE requesting an emergency call or performing a handover, must perform random access with the same success probability.

In order to solve these problems, a contention-free random access method has been proposed in which a network to be accessed is predefined or a random access channel is allocated in advance through a network and a network to be accessed. have.

However, the noncontact random access method may fail to provide fast network access due to inefficiency of resource use and service delay.

Therefore, it is possible to greatly shorten the service connection delay or the initial service connection time through the fast random access, and to the UE which is provided with the low priority service, by using one random access channel as in the conventional random access method, There is a need for a new random access method that can also maintain use efficiency.

The present invention proposes a random access method and apparatus in a mobile communication system.

The present invention proposes a random access method and apparatus for transmitting at least two random access signals to which a UE has given priority in at least one communication device in a mobile communication system.

The present invention proposes a random access method and apparatus in a mobile communication system in which a UE transmits at least two random access signals to at least two mobile communication devices.

The present invention relates to a random access method and apparatus in a mobile communication system in which a UE transmits at least one random access signal and selects at least some of the at least two random access response signals in response to the at least one random access signal, To a random access method and apparatus.

The present invention proposes a random access method and apparatus of a UE including a multi-device random access controller capable of controlling transmission of at least one random access signal to at least two communication devices in a mobile communication system.

Accordingly, the present invention provides a random access method of a user equipment (UE) in a mobile communication system, the method comprising the steps of: the user terminal assigning priority to at least two random access signals; And transmitting at least two random access signals to which the priority is given.

Also, a method proposed by the present invention is a random access method of a user equipment (UE) in a mobile communication system, characterized in that the user equipment transmits at least two random access signals to at least two communication devices .

According to another aspect of the present invention, there is provided a random access method of a user equipment (UE) in a mobile communication system, the method comprising: transmitting at least one random access signal to the user equipment; Selecting random access control by selecting some or all of at least two random access response signals received in response to the at least one random access signal.

The method proposed by the present invention controls the random access method of a user equipment (UE) in a mobile communication system to transmit at least one random access signal to at least two communication devices.

In addition, the apparatus proposed by the present invention is a random access apparatus of a user equipment (UE) in a mobile communication system, comprising: a multi-device random access And a control unit.

In addition, the apparatus proposed by the present invention is a random access apparatus of a user equipment (UE) in a mobile communication system, which assigns priority to at least two random access signals, Random access < / RTI >

Further, the apparatus proposed by the present invention is a random access apparatus of a user equipment (UE) in a mobile communication system, characterized in that the user terminal apparatus comprises a control unit for controlling the transmission of at least two random access signals to at least two communication apparatuses Device random access control unit.

The apparatus proposed by the present invention is a random access apparatus of a user equipment (UE) in a mobile communication system, wherein the user terminal transmits at least one random access signal, and the at least one random access signal And a random access controller for performing random access control by selecting some or all of at least two random access response signals received in response to the random access response signal.

 Using the random access method according to the present invention, the UE can greatly improve the random access success probability by using a plurality of random access signals, and therefore, at the time of handover or at the time of a service request having a high priority such as an emergency call It is possible to greatly shorten the service connection delay or the initial service connection time through the fast random access.

Further, by using the random access method according to the present invention, the UE can perform multiple access for multi-homing, cooperative transmission, etc. by performing random access to a plurality of RATs and / or a plurality of communication devices.

Further, by using the random access method according to the present invention, the UE can adjust the random access performing time of each UE by determining the number of random access signals to be used according to the user's request, and can control the amount of resources for control or data message exchange after random access There is an effect that can be demanded.

Further, by using the random access method according to the present invention, the random access target RAT set, the set of random access target communication devices, the number of random access signals for each communication device, and the priority for each random access signal can be set in accordance with the quality of experience (QoE) It is possible to connect the network satisfying the user QoE.

Further, by using the random access method according to the present invention, the RAT preference, the service use price, the adjacent network list rank, the channel condition, the service condition, the access condition, the random access target RAT type, , Determining at least two random access signals in consideration of various random access conditions such as a distance between the random access target communication apparatus and the UE, a random access target communication apparatus load ratio, collision channel information, collision probability, and the like, There is an effect that the random access control can be performed so as to guarantee the user required QoE.

Further, by using the random access method according to the present invention, the RAT for each signal, the communication device for each signal, the channel group for each signal, the channel (frequency, time, code, A plurality of RATs and / or a plurality of RATs may be determined by determining random access parameters such as power, transmission order for each signal, modulation parameters for each signal, coding parameters for each signal, length per signal, bandwidth per signal, processing gain for each signal, It is possible to perform differentiated random access control according to the communication apparatus.

Also, with the random access method according to the present invention, since the UE performs multiple access according to the available RAT set and available communication devices, the network can be used efficiently.

Also, when the random access method according to the present invention is used, the load of the network can be dispersed because the UE can access multiple RAT connections or multiple communication devices using the network load information.

1 is a flowchart illustrating a random access control operation performed by a UE in a mobile communication system according to an embodiment of the present invention;
FIGS. 2A to 2M are diagrams for explaining a random access method in which UEs of a mobile communication system according to an embodiment of the present invention set different random access signals having different priorities using a channel group or a channel.
3 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention are set to have different random access signal frequencies according to their priorities and transmitted.
4 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention set and transmit random access signals at different times according to priority.
5 is a diagram for explaining a random access method in which UEs of a mobile communication system according to an embodiment of the present invention set and transmit random access signal codes different in priority order.
FIG. 6 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention set and transmit a random access signal in a different order according to a priority order.
7 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention are set to have different random access signal lengths according to their priorities and are transmitted.
FIG. 8 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention are set to have different bandwidths of random access signals according to priorities and are transmitted.
9 is a view for explaining a random access method for transmitting two random access signals not containing information in a UE of a mobile communication system according to an embodiment of the present invention.
10 is a diagram for explaining a random access method for transmitting two random access signals including the same information in a UE of a mobile communication system according to an embodiment of the present invention.
11 is a view for explaining a random access method for transmitting two random access signals including different information in a UE of a mobile communication system according to an embodiment of the present invention.
12 is a diagram for explaining a random access method in which a UE transmits one random access signal to two communication devices in a mobile communication system according to an embodiment of the present invention;
13 is a diagram illustrating a random access method in which a UE transmits two random access signals to one communication device in a mobile communication system according to an embodiment of the present invention.
FIG. 14 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signal to each of two communication devices having the same RAT; FIG.
15 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signals to each of three communication devices having the same RAT;
16 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of two communication devices having the same RAT.
FIG. 17 is a diagram illustrating a case where, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of two communication devices configured with the same RAT and transmits one identical random access signal to two communication devices FIG. 8 is a diagram for explaining a random access method. FIG.
FIG. 18 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of three communication devices configured with the same RAT;
19 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signal to each of two communication apparatuses configured with different RATs.
20 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signals to each of three communication devices configured with some different RATs.
21 is a diagram for explaining a random access method in which a UE transmits one random access signals to each of three communication apparatuses having different RATs in a mobile communication system according to an embodiment of the present invention.
22 is a diagram illustrating a random access method in which a UE transmits a plurality of random access signals to two communication apparatuses configured with different RATs in a mobile communication system according to an embodiment of the present invention.
23 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of three communication devices configured with some different RATs.
24 is a diagram for explaining a random access method in which a UE transmits a plurality of random access signals to each of three communication apparatuses having different RATs in a mobile communication system according to an embodiment of the present invention.
25 is a diagram illustrating a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of two communication devices configured as a first RAT and two communication devices configured as a second RAT Fig.
26 is a diagram illustrating a random access procedure in a mobile communication system according to an embodiment of the present invention.
27A to 27J are diagrams illustrating a UE according to various embodiments in a mobile communication system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

A UE according to the present invention may support various RATs to perform random access to at least one communication device. Here, the RAT is a radio access technology for connecting a UE and a radio access network. It is a radio access technology that can be used for all types of radio access technologies, such as GSM, CDMA2000, WCDMA, LTE, WiBro, WLAN, .

In the present invention, a random access channel is a resource for transmitting at least one random access signal, and the random access channel may have a unique random access channel for each RAT and / or communication device that is a random access target.

The random access channel is divided into at least one resource such as frequency, time, frequency, code, antenna, etc. At this time, at least two resources can be classified into a combined form. For example, in LTE, an OFDM system, a random access channel is divided into a combination of frequency and time.

When the UE performs random access to at least two communication devices, it is necessary to use a random access channel for each communication device, and the random access channels of the at least two communication devices may be the same or different from each other.

 In the present invention, a random access signal is a signal transmitted by a UR to a communication device via a random access channel for random access, and it is necessary to transmit a unique random access signal for each RAT and / or communication device as a random access target, May include various information.

For example, the random access signal may include user ID information, and the random access signal may include requested resource amount information.

The random access signal may be a digital signal or an analog signal. For example, in LTE, a random access signal uses a Zadoff-Chu sequence.

If the UE performs random access to at least two communication devices, it is necessary to transmit a unique random access signal for each communication device, and the random access signals of the at least two communication devices may be the same or different from each other have.

Brief Description of the Drawings Fig. 1 is a flowchart illustrating a random access control operation performed by a UE in a mobile communication system according to an embodiment of the present invention. And transmitting random access signals.

Referring to FIG. 1, the UE proceeds to step 100 of giving priority to at least two random access signals for transmission to at least one communication device or at least two communication devices.

The UE then proceeds to step 200 where it transmits the at least two prior randomized random access signals to the at least one communication device or the at least two communication devices.

If at least two random access response signals are received in response to the at least two random access signals from the at least one communication device or the at least two communication devices, A random access control is performed by selecting some or all of the at least two random access response signals.

First, in step 100 of FIG. 1, the operation of giving priority to the at least two random access signals will be described in detail.

The UE determines random access parameters for at least two random access signals considering at least one of the random access conditions.

And determining a priority for each of the determined random access parameters, the UE determines whether the at least two random access signals having a unique priority for transmission to the at least one communication device or the at least two communication devices Lt; / RTI >

And transmitting the at least two random access signals to the at least one communication device if the random access target RAT is determined according to the active RAT of the UE, can do. Transmitting the at least two random access signals to the at least one communication devices, if the random access target RAT is determined according to the active RAT of the UE and the communication device defined by the network is determined, In the determination process, the determination of the RAT for each signal and the determination of a communication device for each signal may be omitted.

In addition, in determining the random access parameters for transmitting the at least two random access signals to the at least two communication devices, the UE may determine that at least two of the RATs of the communication devices, You can decide. The UE may also determine at least two communication devices in which some or all of the RATs of the communication devices are different from each other and decide to transmit at least two random access signals to each of the at least two communication devices. The UE may also determine to determine at least two communication devices in which some or all of the RATs of the communication devices are equal to each other and to transmit at least two random access signals to each of the determined at least two communication devices. The UE may also determine to determine at least two communication devices in which some or all of the RATs of the communication devices are different from each other and to transmit at least two random access signals to each of the determined at least two communication devices.

Wherein the random access condition is an element that the UE considers to determine at least two random access signals, the RAT preference, the service use price, the neighbor network list rank, the channel condition, the service condition, the access condition, The type of the random access target communication device, the random access use bandwidth, the distance between the random access target communication device and the UE, the random access target communication device load ratio, the collision channel information, and the collision probability.

Referring to the random access condition,

1. RAT preference indicates a user or UE's preferred ranking according to the RAT, and the UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to RAT preference.

For example, if the RAT preference of a UE with LTE, WiBro, and WLAN modems is set to WLAN first, LTE second, and WiBro third, Order random access signal to a second base station configured as LTE, and to transmit a first-order random access signal to a third base station configured as a WiBro, Lt; / RTI > random access signals.

2. The service use price represents the price that the user pays to use the communication service. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the service utilization price.

In one example, if the UE determines a random access signal using the service use price, the UE determines three random access signals and sends a random access signal to the first base station with the lowest service usage price (e.g., 0 yuan / sec) And transmits a first order random access signal to the second base station whose usage price is intermediate (e.g., 5 yuan / second), and transmits the second order random access signal with the highest use price (e.g., 10 won / Sec) to determine a third random access signal to be transmitted to the third base station, thereby determining three random access signals.

3. The neighbor network list rank is the rank of the RAT and / or the communication device assigned to the neighbor list provided by the network. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the neighbor network list rank.

For example, when the UE determines the random access signal using the neighbor network list rank, the UE transmits a first rank random access signal to the first WLAN AP in the first rank according to the neighbor network list rank, Order random access signal to the second LTE base station in the second rank, transmits a third rank random access signal to the second LTE base station in the third rank, and transmits a third rank random access signal to the second WLAN AP in the fourth rank By determining to transmit one fourth order random access signal, four random access signals are determined.

4. The channel condition is the channel environment between the UE and the random access target communication device. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to channel conditions. The channel condition may be classified into a channel quality related quality factor and a spatial quality related quality factor as follows.

The channel quality factor includes RSSI (Received Signal Strength Indicator) determined according to channel characteristics such as fading, path attenuation, shadowing, delay spread, multipath, intra-cell interference, neighbor cell interference, Doppler, antenna gain, , The SNR (Singal-to-Noise Ratio), the SINR (Singular-to-Interference plus Noise Ratio), the error rate, the channel capacity, the available transmission rate, the dispersion and the inefficiency of the available transmission rate, It is a matter of course that the related element can be used as a channel characteristic quality factor.

Wherein the RSSI is an index indicative of a received signal strength measured at a receiving end, and the SNR is an SNR, which is an index representing a ratio of signal power to noise power, and SINR is a signal to interference- Is the index of the ratio of the signal power to the signal power.

The error rate includes a bit error rate (BER), a block error rate (BLER), a frame error rate (FER), a packet error rate (PER), and the like, And the available transmission rate can be expressed as an instantaneous transmission rate or an average transmission rate as a transmission rate that can be actually transmitted in consideration of the channel characteristic factors. The total transmission rate, the transmission rate per user, and the transmission rate per stream .

The outage rate is an indicator of the incapacity probability that may occur when the channel quality is less than a predetermined criterion according to a predetermined incommunicability standard, The communication incapability criteria include RSSI, SNR, SINR, error rate, channel capacity, available data rate, and the like. For example, when the communication disablement criterion is set to 0 dB SNR, the inefficiency of the user is determined according to the probability that the user experiences a channel having an SNR of 0 dB or less.

The spatial characteristic quality factor is a quality factor for considering a space characteristic in addition to the channel characteristic quality factor when a signal is transmitted to a plurality of user groups using multiple antennas. The spatial characteristic quality factor is a correlation factor between user channels, A channel quality factor for each stream, and the like, and elements related to spatial characteristics may be used as spatial characteristic channel quality elements.

The correlation between the user channels is an index indicating the degree of similarity of channel characteristics between user channels. When the correlation between user channels is high, the channel characteristics are similar to each other, and thus the performance decreases in the multiuser spatial multiplexing transmission.

The correlation between the antennas is an index indicating the degree of similarity of channel characteristics between channels formed through a plurality of antennas when the receiving user equipment uses a plurality of antennas. If the correlation between the antennas is high, The performance is reduced in the case of space division multiplexing transmission using multiple antennas.

The rank of the channel matrix is indicative of the number of data streams that are independently available for a matrix channel formed between the transmitter and the receiver.

The channel quality factor for each stream indicates the strength of each stream corresponding to the number of data streams independently available for a matrix channel formed between the transmitter and the receiver. The channel quality factors for each stream include RSSI, SNR , SINR, error rate, channel capacity, available data rates, variance of available data rates, and inefficiencies.

For example, when the UE determines the random access signal using the channel condition, the UE transmits one first rank random access signal to the first base station having a high SNR (e.g., 15dB) according to the SNR, (E. G., 5dB) to determine that the second base station transmits the two second order random access signals.

5. The service condition is a condition related to the service requested by the user. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the service condition.

The service condition includes QoS, traffic class, and the like.

The quality of service (QoS) includes a request delay condition, a requested data rate condition, a request error rate condition, a requested bandwidth condition, and a request inefficiency condition for each user's requested service.

The traffic class includes a large-capacity file, a voice call, a video call, a video streaming, a web browsing, a game, and the like as a kind of service requested by each user.

For example, when a UE determines a random access signal using the service condition, a UE requesting a service having a required transmission rate (e.g., 1 Mbps) transmits a first service to a first base station And determines to transmit two random access signals by transmitting a first random access signal to the first base station and transmitting one second random access signal to the second base station with a low transmit rate (e.g., 0.8 Mbps).

For example, if a UE determines a random access signal using a service condition, a UE requesting a service having a required error rate (e.g., 10%) may request a first base station with a low error rate (e.g., 5% Determines three random access signals by transmitting a rank random access signal and determining to transmit two second rank random access signals to a second base station with a high error rate (e.g., 8%).

For example, when a UE determines a random access signal using a service condition, a UE requesting a voice call service transmits a first random access signal to a first base station, and a second random access signal to a second base station Determines three random access signals by determining to transmit random access signals.

6. Connection conditions are conditions related to the connection environment between communication devices. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the connection condition.

The connection conditions include the type of RAT available, the number of available communication devices per RAT, availability by communication device, load per communication device, user connection conditions, and the like.

The available RAT type indicates the type of RAT that the UE can connect to around the UE and the number of available communication devices per RAT indicates the number of communication devices that the UE can access per RAT around the UE.

Wherein the usability for each communication device indicates whether the UE is connectable to communication devices around the UE, the load for each communication device represents a load on communication devices around the UE, Indicates the reason for the UE performing the connection to the peripheral communication devices. Such connection conditions include an initial connection, a handover connection, and the like.

The handover connection includes an intra-cell handover connection, an inter-cell handover connection, a heterogeneous network handover connection, a multipath connection, a multi-homing connection, a multi-session connection, And performs a handover connection when moving between regions within a cell.

The inter-cell handover connection is an operation for performing a handover connection when the UE moves between adjacent cells, and the heterogeneous network handover connection performs a handover connection when the UE moves between cell areas having different RATs Action. In one embodiment, a UE performs a heterogeneous handover connection when moving from a WCDMA area to a WLAN area.

Wherein the multi-path connection is an operation in which the UE performs network connection through a plurality of paths, the multi-homing connection is an operation in which the UE simultaneously accesses a plurality of communication devices for one service session, The UE accesses at least one communication device to connect a plurality of service sessions

For example, when the UE determines the random access signal using the connection condition, the UE performing the handover transmits a first random access signal to the first base station, and transmits a second random access signal to the second base station And determines to transmit two random access signals.

7. The random access target RAT type indicates the type of RAT that the UE desires to access in order to receive the communication service. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the random access target RAT type. Here, the random access target RAT type is different from the RAT preference, the RAT preference is an element determined by the user or the UE, and the random access target RAT type is an element presented by the system or the network operator.

For example, when a UE having a WCDMA, a WiBro, and a WLAN modem determines a random access signal using a RAT type according to a random access target moving speed, a price, or the like, the UE transmits a first rank random To transmit a second order random access signal to a second base station configured as a WiBro, and to transmit a third order random access signal to a third base station configured as a WLAN, thereby transmitting three random access signals Lt; / RTI >

8. The type of the random access target communication device indicates the type of the communication device for the UE to connect to the radio access network. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the type of the random access target communication device.

For example, when the UE determines a random access signal using a random access target communication device type, the UE transmits a first random access signal to the base station and a second random access signal to the femtocell base station And determines to transmit the third random access signal to the relay, thereby determining three random access signals.

9. The random access use bandwidth represents the bandwidth of the random access channel used for random access by the random access target communication device. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the random access use bandwidth.

For example, when the UE determines the random access signal using the random access use bandwidth, the UE transmits two first rank random access signals to the first base station with a wide bandwidth (e.g., 50 KHz) E.g., 20 KHz), to determine the three random access signals by determining to transmit a second order random access signal to the second base station.

10. The distance between the random access target communication device and the UE represents the physical distance between the UE and the random access target communication device. The UE determines at least two random access signals by determining the random access parameters and priority of the random access signal according to the distance between the random access target communication device and the UE.

For example, when the UE determines the random access signal using the distance between the random access target communication device and the UE, the UE transmits one first rank random access signal to the first base station with a short distance (for example, 100 m) , And determines to transmit the two second order random access signals to the second base station with a long distance (e.g., 300 m), thereby determining three random access signals.

11. The random access target communication device load ratio indicates the resource load ratio of the random access target communication device. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the load factor of the random access target communication device.

In one example, when the UE determines the random access signal using the random access subject communication load factor, the UE transmits a first rank random access signal to the first base station with a low load factor (e.g., 30%), (E.g., 60%) to the second base station, thereby determining two random access signals.

12. The collision channel information indicates average collision information for a random access channel or a random access channel in which a collision occurred in a previous random access frame of the target communication apparatus. The UE determines at least two random access signals by determining a random access parameter and a priority of the random access signal according to the collision channel information of the target communication device.

For example, when the UE determines the random access signal using the collision channel information, the UE transmits a first rank random access signal to the first base station with few (e.g., two) collision channels of the previous frame, Determines three random access signals by determining to transmit two second rank random access signals to a second base station with many (e.g., six) collision channels of the frame.

13. Collision probability represents the previous random access frame or average collision probability of the target communication device. The UE determines at least two random access signals by determining a random access parameter and priority of the random access signal according to the collision probability of the target communication device. The collision probability can be defined by Equation (1) or Equation (2) as follows.

Equation (1) represents the ratio of the total number of random access channels in the channel number range, and Equation (2) represents the ratio of the number of random access channels using the channel number range in which the collision occurs.

For example, when the UE determines the random access signal using the collision probability, the UE transmits a first rank random access signal to the first base station with a low average collision probability (e.g., 10%), Determines three random access signals by determining to transmit two second rank random access signals to a second base station with a high collision probability (e.g., 30%).

In determining the at least two random access signals in consideration of the random access condition, the at least two random access conditions may be combined and used.

In the following embodiment, the UE shows a case where at least two random access conditions are used in combination. Hereinafter, only some embodiments that use two or three random access conditions in combination are used, and the random access conditions described above are used in various combinations, and four or more of the random access conditions described above are combined Of course, can be used.

First, a random access method according to the present invention in which a UE can use at least two random access conditions in combination is described. Wherein the UE determines at least two random access signals by determining a random access random access parameter and a priority in consideration of at least two random access conditions.

First, in determining at least two random access signals, the UE determines at least two random access signals by determining a random access random access parameter and a priority according to a type of a random access target communication device while satisfying a request delay condition.

For example, if a UE considers a request delay condition and a type of random access target communication device, a UE requesting a service having a request delay (for example, 50 ms) A first order random access signal is transmitted to a first base station (for example, transmission delay of 40 ms) and a second order random access signal is transmitted to a first femtocell base station (for example, transmission available transmission rate is 1 Mbps) And determines three random access signals by determining to transmit a third order random access signal to the first relay (e.g., at an available transmission rate of 2 Mbps).

Second, the UE determines at least two random access signals by determining random access random access parameters and priorities according to RAT preferences while satisfying the required bandwidth condition in determining at least two random access signals.

For example, when the UE considers the required bandwidth condition and the RAT preference, and the RAT affinity of the UE with the LTE, WiBro, and WLAN modems is set to the first rank, the LTE second rank, and the WiBro rank, A UE requesting a service with a required bandwidth (e.g., 500 KHz) is assigned to a first base station (e.g., 1 MHz available bandwidth) configured as a WLAN according to the RAT preference among the communication devices that guarantee the required bandwidth (e.g., 500 KHz) And transmits a first order random access signal to the second base station (e.g., available bandwidth 800KHz) configured with LTE, and transmits a second order random access signal to the third base station configured with WiBro 900KHz) to transmit a third order random access signal, thereby determining three random access signals.

Next, a random access method according to the present invention in which the UE can use at least three random access conditions in combination is described. Wherein the UE determines at least two random access signals by determining a random access random access parameter and a priority in consideration of at least three random access conditions.

First, the UE determines at least two random access signals by determining a random access random access parameter and a priority according to a channel condition while satisfying a required data rate requirement and a required error rate condition in determining at least two random access signals.

For example, a UE requesting a service having a required data rate (e.g., 1 Mbps) and a requested data rate (e.g., 5%) when the UE considers a required data rate condition, a required error rate condition, (For example, a possible transmission rate of 1.5 Mbps, an error rate of 3%) having a high SNR (for example, 15 dB) according to the SNR among the communication devices that satisfy the condition and the required error rate (for example, 5% Order random access signal and determines to transmit the two second-order random access signals to a second base station (e.g., available rate 1.2 Mbps, error rate 7%) with a low SNR (e.g., 5 dB) Signals.

The random access parameter determination process will be described below.

In the random access parameter determination process, the random access parameter determination process may be performed differently according to the order of determining the random access signal number, the random access signal priority, and the random access parameter.

The random access parameters include a RAT for each signal, a communication device for each signal, a channel group for each signal, a channel for each signal (frequency, time, code, antenna, etc.), power per signal, transmission sequence for each signal, Parameters, length per signal, bandwidth per signal, processing gain per signal, and per-signal inclusion information.

Wherein the random access parameter determination step determines the number, priority, and random access parameters of the at least two random access signals, and determines the random access parameters based on the random access signal number, the random access signal priority, The access parameter determination process may be performed differently.

Although various embodiments of the random access parameter determination process are described in the following embodiments, only a limited number of examples are shown for the sake of convenience of description, and it is a matter of course that various uses can be made using the above listed random access parameters.

First, the random access signal number, the random access signal priority, and the random access parameter are simultaneously determined in the determination of the random access parameters.

For example, the first random access signal and the second random access signal assigned the first order in the random access parameter determination process are transmitted as random access parameters to the first base station by assigning a transmission power of 50 mW, 3 random access signal is allocated as a random access parameter and a transmission power of 30 mW is allocated to the second base station. At this time, the number of signals is three, the priority for each signal is two for the first order, the second order, and each random access parameter is determined by the power.

Secondly, the random access signal number is first determined in the random access parameter determination process, and the priority and random access parameter for the random access signal are determined simultaneously according to the determined number of random access signals.

For example, in the random access parameter determination process, three random access signals are first determined, a first random access signal is assigned a first rank and transmitted to a first base station configured as LTE as a random access parameter, and a second random access Signal to a second base station configured as a WLAN as a random access parameter, assigns a third random access signal to the third base station, and determines to transmit the third random access signal to a third base station configured as WCDMA as a random access parameter. At this time, the number of signals is three, the priority for each signal is first rank, the second rank is one, and the third rank is one, and each random access parameter is determined by the RAT.

Third, the random access signal priority is first determined in the random access parameter determination process, and the random access signal number and the random access parameter are determined at the same time according to the determined random access signal priority.

For example, in the random access parameter determination process, a random access signal priority is first determined from a first rank to a third rank, a first random access signal given a first rank is transmitted as a random access parameter to a base station, Transmits the ranked second random access signal as a random access parameter to the relay, and determines to transmit the third random access signal given the third order as a random access parameter to the femtocell base station. At this time, the number of signals is three, the priority for each signal is a first order, the second order is one, the third order is one, and each random access parameter is determined by the communication device.

Fourth, a random access parameter is first determined in the random access parameter determination process, and a random access signal number and a random access signal priority are determined at the same time according to the determined random access parameter.

For example, in the determination of the random access parameter, the bandwidth of the first bandwidth, the second bandwidth, and the third bandwidth are determined as the random access parameters. And transmitting a first random access signal assigned a first rank as a random access parameter in a first bandwidth, transmitting a second random access signal given a second rank as a random access parameter in a second bandwidth, And to transmit the third random access signal as the random access parameter in the third bandwidth. At this time, the number of signals is three, the priority for each signal is first, first, second and third, and each random access parameter is determined by the bandwidth.

Fifth, in the determination of the random access parameters, the random access signal number and the random access signal priority are simultaneously determined first, and the random access parameter is determined according to the determined random access signal number and the random access signal priority.

For example, a first random access signal assigned a first rank, a second random access signal given a second rank, and a third random access signal given a third rank are determined first in the random access parameter determination process. Then, the first random access signal assigned the first rank is transmitted using QPSK modulation as the random access parameter, the second random access signal assigned the second rank is transmitted using the 16QAM modulation as the random access parameter, And determines to transmit the ranked third random access signal using 64QAM modulation as the random access parameter. At this time, the number of signals is three, the priority for each signal is a first order, the second order is one, the third order is one, and each random access parameter is determined by the modulation parameter.

Sixth, in the random access parameter determination process, the random access signal number and the random access parameter are simultaneously determined first, and the random access signal priority is determined according to the determined random access signal number and the random access parameter.

For example, in the random access parameter determination process, a first random access signal and a second random access signal are transmitted as a random access parameter to a first base station configured as LTE, and a third random access signal is transmitted as a random access parameter, To the second base station. The first random access signal and the second random access signal are assigned a first rank and the third random access signal is assigned a second rank. At this time, the number of signals is three, the priority for each signal is two for the first rank, one for the second rank, and each random access parameter is determined by the RAT.

In the seventh random access parameter determination process, the random access signal priority and the random access parameter are determined first, and the random access signal number is determined according to the determined random access signal priority and the random access parameter.

For example, in the random access parameter determination process, a transmission power of 50 mW is assigned as the random access parameter to the first rank, and a transmission power of 20 mW is allocated to the second rank as the random access parameter. The first random access signal is assigned a first rank, and the second random access signal and the third random access signal are assigned a second rank to determine to transmit three random access signals. At this time, the number of signals is three, the priority for each signal is first, the second is two, and each random access parameter is determined by the power.

[0034] [28] Eighth, in the random access parameter determination process, the number of random access signals is first determined, the priority of each random access signal is determined according to the determined number of random access signals, Parameters are determined.

For example, in the determination of the random access parameter, three random access signals are first determined, a first random access signal is assigned a first rank, a second random access signal is assigned a second rank, And to give the signal a third ranking. Then, the first random access signal is transmitted as a random access parameter to a first base station configured as a WLAN, the second random access signal is transmitted as a random access parameter to a second base station configured as LTE, To the third base station configured as WCDMA as the access parameter. At this time, the number of signals is three, the priority for each signal is first rank, the second rank is one, and the third rank is one, and each random access parameter is determined by the RAT.

Ninth, the random access signal number is first determined in the random access parameter determination process, and the random access parameter is determined according to the determined number of random access signals. Then, the random access signal priority is determined according to the determined number of random access signals and the random access parameter.

For example, in the determination of the random access parameters, it is determined to first determine two random access signals, to transmit the first random access signal as a random access parameter to the base station, and to transmit the second random access signal as a random access parameter to the relay do. Then, the first random access signal is assigned a first rank and the second random access signal is assigned a second rank. At this time, the number of signals is two, the priority for each signal is first, one is second, and each random access parameter is determined by the communication device.

The random access signal priority is first determined in the random access parameter determination step, and the random access signal number is determined according to the determined random access signal priority. Then, a random access parameter is determined according to the determined random access signal priority and the number of signals.

For example, in the random access parameter determination process, the random access signal priority is first determined from the first rank to the second rank, the first random access signal is assigned a first rank, the second random access signal is assigned a second rank To decide to transmit two random access signals. Then, it is determined to transmit the first random access signal as a random access parameter at a coding rate of 1/3 and to transmit the second random access signal as a random access parameter at a coding rate of 1/2. At this time, the number of signals is two, the priority for each signal is first, one is second, and each random access parameter is determined by the coding parameter.

A random access signal priority is first determined in the random access parameter determination step, and a random access parameter is determined according to the determined random access signal priority. Then, random access signal priority is determined according to the determined random access signal priority and random access parameters. And determines the number of access signals.

For example, in the random access parameter determination process, the random access signal priority is first determined from the first rank to the third rank, the first rank is transmitted with a length of 80 ms, the second rank is transmitted with a length of 50 ms, It is determined to transmit in the order of 30ms in length. Then, the first random access signal is assigned a first rank, the second random access signal and a third random access signal are assigned a second rank, the fourth random access signal is assigned a third rank, Access signals. At this time, the number of signals is four, the priority for each signal is first, the second is two, and the third is one, and each random access parameter is determined by the signal length.

The random access parameters are determined first in the random access parameter determination process, the random access signal number is determined according to the determined random access parameter, and the random access signal priority is determined according to the determined random access parameter and the number of signals. do.

For example, in the determination of the random access parameter, the bandwidth of the first bandwidth, the second bandwidth, and the third bandwidth are determined first as random access parameters, and three random access signals are determined. Thereafter, the first random access signal is assigned a first rank, the first random access signal is transmitted as a random access parameter in a first bandwidth, the second random access signal is assigned a second rank in a second bandwidth as a random access parameter, 3 random access signal to the third bandwidth as a random access parameter. At this time, the number of signals is three, the priority for each signal is first, one is second, one is third, and each random access parameter is determined as a bandwidth.

The random access parameters are determined first in the random access parameter determination step, and the random access signal priority is determined according to the determined random access parameter, and then the random access signal number is determined according to the determined random access parameter and the priority order. do.

For example, in the determination of the random access parameters, the modulation parameters of BPSK and QPSK are first determined as random access parameters, and the first order is transmitted with BPSK and the second order is transmitted with QPSK. Then, the first random access signal and the second random access signal to which the first order is assigned are transmitted as BPSK with random access parameters, and the third random access signal and the fourth random access signal to which the second order is assigned are transmitted as random access parameters QPSK. At this time, the number of signals is four, the priority for each signal is two for the first rank, two for the second rank, and each random access parameter is determined by the modulation parameter.

Hereinafter, the random access parameter and the priority determination subject of the random access signal will be described.

The random access parameters and the priority of the random access signal to be transmitted to the at least one communication device by the UE can be determined by using a predefined criterion suggested by the system as follows, or by using at least one communication device Lt; / RTI >

First, if the system is a main entity, random access parameters and priorities of at least two random access signals are determined according to predefined criteria presented by the system.

For example, when a UE configured by a first RAT transmits a first random access signal and a second random access signal for connection to a base station configured by a first RAT and a femtocell base station configured by a first RAT, Assigns a first order to a first random access signal transmitted to a base station and gives a second order to a second random access signal transmitted to a femtocell base station.

Second, when the UE is the subject, the UE itself determines the random access parameters and priority of the at least two random access signals.

For example, when a UE configured by a first RAT transmits a first random access signal and a second random access signal for connection to a first base station configured as a first RAT and a second base station configured as a first RAT, Assigns a first rank to the first random access signal transmitted to the first base station and gives a second rank to the second random access signal transmitted to the second base station.

Third, when at least one communication apparatus as a random access target is a subject, random access of random access signals of at least two random access signals transmitted by the UE in response to a request of at least one communication apparatus, Determine parameters and priorities. At this time, when the UE connects to the plurality of random access target communication devices, the random access parameters and priority of each of the random access signals of the at least two random access signals are determined according to the request of the corresponding communication device.

For example, when a UE configured by a first RAT and a second RAT transmits four random access signals for connection to a first base station configured as a first RAT and a second base station configured as a second RAT, And assigns a first random access signal and a second random access signal, which are transmitted to the first base station by a request to give a higher priority, to the first random access signal. And assigns a third random access signal to the second base station and a fourth random access signal to transmit the second random access signal to the second base station at a request to grant a lower priority of the second base station.

Fourth, when at least one random access target communication device is the subject, the random access target communication device, which is a random access target communication device, Determine parameters and priorities.

For example, when a UE configured by a first RAT and a second RAT transmits four random access signals to access a first base station configured as a first RAT and a second base station configured as a second RAT, The mobile station assigns a first rank to a first random access signal transmitted to a first base station according to a determination of a UE and assigns a second rank to a second random access signal transmitted to the first base station, do. And assigns a third rank to the third random access signal transmitted to the second base station according to the judgment of the UE, considering a request to grant a lower priority of the second base station, and assigns a fourth rank to the fourth random access signal .

Hereinafter, an operation of setting the priority order of the random access signals differently using the random access parameters will be described.

In the random access method according to the present invention, when the UE assigns and priorities of at least two random access signals, the RAT, the communication device, the channel group, the channel (frequency, time, Code, antenna, etc.), power, transmission order, modulation parameters, coding parameters, length, bandwidth, processing gain, and inclusion information.

In the following embodiments, the operations for setting the elements to be different from each other among the random access signals having different priorities are described. Although the UE transmits four random access signals for convenience of explanation, the UE according to the present invention transmits a plurality of random access signals of three or less, or transmits five or more random access signals (Frequency, time, code), power, transmission order, modulation parameter, coding parameter, length, bandwidth, processing gain, etc. in accordance with the priority order of the random access signal in the same manner Information can be set to be different and transmitted.

At this time, some or all of the at least two random access signals transmitted by the UE may not be given priority, and at least one random access signal not assigned a priority may omit the random access parameter determination process, (default) random access parameters.

First, the UE sets and transmits RATs different between at least two random access signals having different priorities.

When the UE transmits four random access signals, the first random access signal assigned a first rank is transmitted to the first base station configured as LTE, and the second random access signal assigned a second rank is transmitted as a WLAN 2 to the third base station. The third random access signal having the third order is transmitted to the third base station configured as WiBro, and the fourth random access signal having the fourth order is transmitted to the fourth base station configured as WCDMA. In this manner, the UE can set and transmit the RAT according to the priority of the random access signal in transmitting at least two random access signals. At this time, the random access having the same priority is transmitted using the same RAT. At this time, at least two random access signals having the same priority can be transmitted using the same RAT as the first random access parameter, and setting at least one second random access parameter to be different from each other. Here, the second random access parameter includes a communication device, a channel group, a channel (frequency, time, code, antenna, etc.), power, transmission order, modulation parameter, coding parameter, length, bandwidth, processing gain and inclusion information.

Second, the UE sets and transmits the communication apparatuses to mutually different at least two random access signals having different priorities.

When the UE transmits four random access signals, the first random access signal and the second random access signal assigned the first order are transmitted to the base station, and the third random access signal assigned the second order is transmitted to the relay And transmits the fourth random access signal to the femtocell base station. At this time, the first random access signal and the second random access signal having the same priority are set so that the transmission time for each signal is different, and the random access target communication device transmits the first random access signal and the second random access signal so that the random access target communication device can be distinguished. In this manner, the UE can set and transmit the communication apparatuses different according to the priority of the random access signal in transmitting at least two random access signals. At this time, the random access having the same priority is transmitted using the same communication device. At this time, at least two random access signals having the same priority may use the same communication apparatus as the first random access parameter, and may transmit and set at least one second random access parameter to be different from each other. Here, the second random access parameter includes RAT, channel group, channel (frequency, time, code, antenna, etc.), power, transmission order, modulation parameter, coding parameter, length, bandwidth, processing gain and inclusion information.

Third, the UE sets and transmits a channel group to be different between at least two random access signals having different priorities.

An operation of setting the priorities of at least two random access signals differently using the channel group will be described with reference to FIG.

(1) How to configure channel groups

The UE may configure the channel group according to the following strategy to set the channel group to be different from each other among the at least two random access signals having different priorities.

And configure some or all of the at least two random access channel groups to include mutually orthogonal channels.

Or at least one channel in which some or all of the at least two random access channel groups comprise the same channel.

Or a part or all of at least two random access channel groups with different number of channels.

Or configure some or all of the at least two random access channel groups with the same number of channels.

Or gives some or all of the at least two random access channel groups different selection probabilities to each other.

Or gives some or all of the at least two random access channel groups the same selection probability.

Or at least some of all or at least two of the at least two random access channel groups comprise at least two channel subgroups.

Or channels in which some or all of the at least two channel subgroups are mutually orthogonal.

Or at least one channel in which some or all of the at least two channel subgroups are the same.

Or a part or all of the at least two channel subgroups are constituted by mutually different channel numbers.

Or a part or all of at least two channel subgroups are constituted by the same number of channels.

Or assign some or all of the at least two channel subgroups different selection probabilities to each other.

Or gives some or all of the at least two channel subgroups the same selection probability.

(2) Channel selection method using channel group

The UE may select a random access channel for transmitting at least two random access signals in accordance with the following strategy to set the channel group to be different between at least two random access signals of different priorities.

And random access channels for transmitting each of a part or all of the at least two random access signals having different priorities are selected from different channel groups.

Or random access channels for transmitting each of at least some of the at least two random access signals having different priorities from the same channel group.

(3) Definition of Random Access Channel

The random access channel is a radio channel defined to transmit a random access signal, and is formed of a frequency, a time, a code, an antenna, or the like. The random access channel group is a channel set composed of at least one random access channel. When transmitting a random access signal, the random access channel group randomly selects one of the channels included in the random access channel group and transmits a random access signal send. At this time, it is necessary to select the same random access channel so as not to be duplicated in order to transmit a plurality of random access signals, and to select each of the plurality of random access signals to use different random access channels.

(4) Configuration of Channel Group According to Priority Embodiment

- It is possible to configure some or all of the at least two random access channel groups to be mutually orthogonal channels in order to set the channel groups to be different according to the priority according to the random access signal.

2A is a diagram for explaining a random access method using random access channel groups composed of channels orthogonal to each other in a UE of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 2A, the three random access channel groups are configured as mutually orthogonal channels. The first random access channel group comprises from the first random access channel to the eighth random access channel, the second random access channel group comprises from the ninth random access channel to the fifteenth random access channel, The random access channel group is configured to include the sixteenth random access channel to the twentieth random access channel.

In order to set the channel groups to be different according to the priority according to the random access signal, some or all of the at least two random access channel groups may be configured to overlap.

 FIG. 2B is a diagram for explaining a random access method using random access channel groups composed of partially overlapped channels in a UE of a mobile communication system according to an embodiment of the present invention

Referring to FIG. 2B, three random access channel groups are partially overlapped. The first random access channel group is configured to include the first random access channel to the fifteenth random access channel and the second random access channel group includes the sixth random access channel to the fifteenth random access channel, The random access channel group is configured to include the eleventh random access channel to the fifteenth random access channel.

- Some or all of the at least two random access channel groups may be configured with different number of channels in order to set the channel group to be different according to the priority according to the random access signal.

FIG. 2C is a diagram for explaining a random access method in which UEs of a mobile communication system according to an embodiment of the present invention configure different numbers of random access channels for each random access channel group.

Referring to FIG. 2C, it is assumed that the first random access channel group is composed of four random access channels and the second random access channel group is composed of six random access channels so that two random access channel groups are different from each other And the number of access channels.

- Some or all of the at least two random access channel groups may be configured with the same number of random access channels in order to set the channel groups to be different according to the priority according to the random access signal.

For example, two random access channel groups are configured with the same number of random access channels by configuring each of the first random access channel group and the second random access channel group with five random access channels.

A different selection probability can be given to some or all of at least two random access channel groups to set the channel groups to be different according to the priority according to the random access signal.

FIG. 2D is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention differentially assign random access channel group selection probabilities.

Referring to FIG. 2D, different random access channel groups are given different selection probabilities. Gives a 66% selection probability to the first random access channel group, and gives 33% selection probability to the second random access channel group.

The same selection probability can be given to some or all of at least two groups of random access channels in order to set the channel groups to be different according to the priority according to the random access signal.

In one example, two random access channel groups are given the same selection probability by giving 50% selection probability to each of the first random access channel group and the second random access channel group.

At least two random access channel groups are partially overlapped in order to set the channel groups to be different according to the priority order of random access signals, and each of the partial channel groups is divided into at least two channel subgroups, So that the selection probability is different.

FIG. 2E is a diagram illustrating a structure of a UE in a mobile communication system according to an exemplary embodiment of the present invention. The UE is divided into at least two channel subgroups and partially overlapped with each other. FIG. 8 is a diagram for explaining a random access method using channel groups. FIG.

Referring to FIG. 2E, the three random access channel groups are partially overlapped so that the first random access channel group is partially overlapped with the second random access channel group and the third random access channel group, The random access channel group is partially overlapped with the third random access channel group. Further, each of the two channel groups is divided into at least two channel subgroups, and the selection probability of each subgroup is different. The first random access channel group including the first random access channel to the fifteenth random access channel is divided into three channel subgroups, the first channel subgroup of the first channel group is divided into the first random access channel, Access channel, thereby setting the selection probability to 1/2, and configuring the second channel subgroup of the first channel group to include the sixth random access channel to the tenth random access channel so that the selection probability is 1/3 And the third channel unit group of the first channel group is configured to include the eleventh random access channel to the fifteenth random access channel to give a selection probability of 1/6. Also, the second random access channel group including the sixth random access channel to the fifteenth random access channel is divided into two channel subgroups, the first channel subgroup of the second channel group is divided into the sixth random access channel 10 random access channels so as to give a selection probability of 2/3 and to configure the second channel subgroup of the second channel group to include the 11th random access channel to the 15th random access channel to set the selection probability to 1 / 3. Finally, a third random access channel group including the tenth random access channel to the fifteenth random access channel is configured.

(5) Channel selection method

≪ / RTI > a method for arbitrarily selecting without redundancy in all available random access channels or one random access channel group.

Randomly select at least two random access channels so as not to overlap in all available random access channels or one random access channel group and transmit at least two random access signals through each.

2F is a diagram for explaining a random access method for selecting at least two random access channels without any redundancy in all available random access channels or one random access channel group in a UE of a mobile communication system according to an embodiment of the present invention to be.

Referring to FIG. 2F, randomly selecting a third random access channel and a fifth random access channel so as not to overlap among the ten available random access channels, and transmitting the two random access signals through each random access channel.

A method for selecting the same number of random access channels for each random access channel group when all available channels are composed of at least two random access channel groups will be described.

And randomly selecting at least two random access channels to select the same number of random access channels for each random access channel group if the entire available channels are composed of at least two random access channel groups, Random access signals.

If it is impossible to select the same number of random access channels for each random access channel group, random numbers of random access channels are randomly selected for each random access channel group as many as possible, Randomly selected one by one so as not to overlap with the one already selected in the access channel group or arbitrarily selected so as not to overlap with the already selected one in all available random access channels.

FIG. 2G is a diagram for explaining a random access method for selecting the same number of random access channels for each random access channel group in a UE of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 2G, when the entire available channels are configured as a first random access channel group and a second random access channel group, in selecting two random access channels, a second random access channel Channel, selects a seventh random access channel in the second random access channel group, and transmits two random access signals through each of them.

In one example, when three random access signals are transmitted, one randomly selected from the first random access channel group, one arbitrarily selected from the second random access channel group, and the other randomly selected from the first random access channel Group and the second random access channel group that are not overlapped with those already selected.

When transmitting four random access signals, two channels are selected in the first random access channel group and two channels are selected in the second random access channel group.

A method for selecting at least two random access channels when the entire available channels are composed of at least two random access channel groups and the selection probability for each random access channel group is different.

Randomly selecting at least two random access channels so that they do not overlap in all available channels when the entire available channels are composed of at least two random access channel groups and selection probabilities are different for each random access channel group, And selects at least two random access signals according to the selection probability assigned to the channel group.

2H is a diagram for explaining a random access method of selecting at least two random access channels in at least two random access channel groups to which a UE of a mobile communication system according to an embodiment of the present invention is given different selection probabilities .

Referring to FIG. 2H, when transmitting two random access signals, two random access channels are selected with a selection probability of 2/3 in the first random access channel group and 1/3 selection probability in the second random access channel group. The second random access channel and the fourth random access channel may be selected to transmit two random access signals through each of them.

- When all available channels are composed of at least two random access channel groups, a method of selecting only in a specific random access channel group will be described.

And randomly selecting at least two random access channels so as not to overlap only in at least one specific random access channel group when the entire available channels are composed of at least two random access channel groups, send.

2I is a diagram for explaining a random access method for selecting at least two random access channels in at least one specific random access channel group in a UE of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 2I, when transmitting two random access signals, the seventh random access channel and the ninth random access channel are selected by randomly selecting two random access channels so as not to overlap only the second random access channel group And transmits at least two random access signals through each of them.

Selecting at least two random access channels in different random access channel groups to transmit at least two random access signals of different priority if all available channels are composed of at least two random access channel groups Describe the method.

When the entire available channels are composed of at least two random access channel groups, at least two random access channels are selected from different random access channel groups to transmit at least two random access signals of different priority And transmits at least two random access signals through each of them.

For example, when transmitting two random access signals, a random access channel for transmitting a first random access signal assigned a first rank is selected from a first random access channel group, and a second random access channel Selects a random access channel for transmitting a random access signal in the second random access channel group, and transmits two random access signals through each of them.

When at least two random access channels are selected in the same random access channel group to transmit some of the at least two random access signals of different priorities when all available channels are composed of at least two random access channel groups As shown in FIG.

When the entire available channels are composed of at least two random access channel groups, at least two random access channels are selected from the same random access channel group to transmit some of the at least two random access signals of different priorities And transmits at least two random access signals through each.

For example, when three random access signals are transmitted, random access channels for transmitting a first random access signal assigned a first rank and a second random access signal assigned a second rank, respectively, Group, selects a random access channel for transmitting the third random access signal in the third random access channel group, and transmits three random access signals through each of the groups.

A method for selecting at least two random access channels to transmit at least two random access signals of different priorities when all available channels are composed of at least two mutually orthogonal random access channel groups, .

When the entire available channels are composed of at least two mutually orthogonal random access channel groups, a random access channel group in a random access channel group corresponding to each priority is transmitted in order to transmit at least two random access signals having different priorities, Randomly selects a channel and transmits at least two random access signals through each random access channel.

2J is a diagram for explaining a random access method for selecting at least two random access channels in a channel group orthogonal to each other in a UE of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 2J, when the UE transmits four random access signals using random access channel groups composed of channels orthogonal to each other, the first random access signal assigned a first rank is a first random access channel To an eighth random access channel using a second random access channel in a first random access channel group. And the second random access signal and the third random access signal to which the second randomized access signal is assigned are the ninth random access channel and the twelfth random access channel in the second random access channel group including the ninth random access channel to the fifteenth random access channel, Access channel, and the third random access signal transmitted in the third random access channel group including the 16th random access channel to the 20 < th > random access channel is transmitted using the 18th random access channel do.

A method for selecting at least two random access channels to transmit at least two random access signals of different priorities when all available channels are composed of at least two random access channel groups in which some channels overlap .

If the entire available channels are composed of at least two random access channel groups in which some of the channels are overlapped, a random access channel group corresponding to each priority for transmitting at least two random access signals of different priority, Randomly selects a random access channel and transmits at least two random access signals through each random access channel.

FIG. 2K is a diagram for explaining a random access method using random access channel groups composed of partially overlapped channels in a UE of a mobile communication system according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 2K, when the UE transmits four random access signals using random access channel groups composed of a plurality of overlapping channels, the first random access signal assigned a first rank is a first random access channel To the fifteenth random access channel using the third random access channel. And the second random access signal and the third random access signal to which the second randomized access signal is assigned are the 11th random access channel and the 9th random access channel in the second random access channel group including the sixth random access channel to the 15th random access channel, Access channel, and the fourth random access signal transmitted in the third random access channel group including the eleventh random access channel to the fifteenth random access channel is transmitted using the 14th random access channel do. In this process all channels are selected so that they do not overlap.

- all available channels are made up of at least two random access channel groups in which some channels are superimposed, and some of the channel groups are divided into at least two channel subgroups, and different selection probabilities A method for selecting at least two random access channels to transmit at least two random access signals having different priorities will be described.

The entire available channels are composed of at least two random access channel groups in which some channels are overlapped, and each of the partial channel groups is divided into at least two channel subgroups, and different selection probabilities Random access channel groups are randomly selected in a random access channel group corresponding to each priority in order to transmit at least two random access signals having different priorities, Selects at least two random access signals according to the selection probability, and transmits through each random access channel.

FIG. 21 is a diagram illustrating a structure of a UE of a mobile communication system according to an embodiment of the present invention. The UE is divided into at least two channel subgroups and partially overlapped with each other. And a random access method for selecting at least two random access channels in a channel group.

Referring to FIG. 21, the UE is divided into at least two channel subgroups, each of which is composed of a plurality of overlapping channels, and each of the channel groups is divided into a plurality of channel subgroups. The first random access signal to which the first random access signal is assigned is the first random access channel group of the first random access channel group including the first random access channel to the fifteenth random access channel, A probability of 1/2 in the sub-group, a probability of 1/3 in the second channel group of the first channel group, and a probability of 1/6 in the third channel group of the first channel group And randomly selects a random access channel. And the second random access signal and the third random access signal to which the second random access signal is assigned are the first random access channel group of the second random access channel group including the sixth random access channel to the fifteenth random access channel, Randomly selects two random access channels with a selection probability of 2/3 and a 1/3 selection probability in the second channel subgroup of the second channel group and the third ranked random access signal Arbitrarily selected from the third random access channel group including the eleventh random access channel to the fifteenth random access channel, and transmits four random access channel signals through each of them.

A method for selecting a plurality of random access frames will be described.

And transmits at least two random access signals using at least two random access frames. At this time, in selecting at least two random access frames, it is possible to select the same random access channel or select a different random access channel in each random access frame, and to select at least two random access channels in each random access frame to be.

FIG. 2M is a diagram for explaining a random access method for transmitting a random access channel for at least two random access signals in a UE of a mobile communication system according to an embodiment of the present invention using a plurality of random access frames.

Referring to FIG. 2M, in selecting two random access channels, the UE selects a seventh random access channel in random access frame 1 so as to select one random access channel different from each other in each of two random access frames, Selects the ninth random access channel in random access frame 2, and transmits at least two random access signals through each.

Fourth, the UE sets and transmits the frequency of at least two random access signals having different priorities to each other.

3 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention are set to have different random access signal frequencies according to their priorities and are transmitted.

Referring to FIG. 3, when the UE transmits four random access signals, the first random access signal and the second random access signal are transmitted through the first frequency and the second random access signal, respectively, Transmits the third random access signal through the second frequency, and transmits the third random access signal through the third frequency. At this time, the first random access signal and the second random access signal having the same priority are set so that the code for each signal is different from each other, so that the random access target communication device can be distinguished. In this manner, the UE may transmit and transmit at least two random access signals by setting the frequency as a first random access parameter different according to the priority of the random access signal. At this time, at least two random access signals having the same priority may use the same frequency as the first random access parameter, and may transmit and set at least one second random access parameter different from each other. Here, the second random access parameter includes the RAT, the communication device, the channel (time, code, antenna, etc.), power, transmission order, modulation parameters, coding parameters, length, bandwidth, processing gain and inclusion information.

 Fifth, the UE sets and transmits the time difference between at least two random access signals having different priorities.

4 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention are set to have different random access signal times according to priorities and are transmitted.

Referring to FIG. 4, when the UE transmits four random access signals, the UE transmits a first random access signal with a first order through a first time, and a second random access signal And transmits the third random access signal through the second time, and transmits the fourth random access signal through the fourth time. At this time, the second random access signal having the same priority and the third random access signal are set so that the frequencies of the signals are different from each other, and the random access target communication device transmits the signals so that the random access target communication device can be distinguished. In this manner, the UE can transmit and receive at least two random access signals by setting the time to be different according to the priority of the random access signal. At this time, at least two random access signals having the same priority can be transmitted using the same time as the first random access parameter and by setting at least one second random access parameter to be different from each other. Here, the second random access parameter includes the RAT, the communication device, the channel (frequency, code, antenna, etc.), power, transmission order, modulation parameters, coding parameters, length, bandwidth, processing gain and inclusion information.

 Sixth, the UE sets and transmits codes with mutually different at least two random access signals having different priorities.

FIG. 5 is a diagram for explaining a random access method in which a UE of a mobile communication system according to an embodiment of the present invention transmits a code of a random access signal different according to a priority.

Referring to FIG. 5, when the UE transmits three random access signals, the first random access signal and the second random access signal assigned the first order are transmitted through the first code, And transmits the third random access signal through the second code. At this time, the first random access signal and the second random access signal having the same priority are set so that the power for each signal is different, and the random access target communication device transmits the first random access signal and the second random access signal so that they can be distinguished. In this manner, the UE can transmit and receive at least two random access signals by setting the codes to be different according to the order of the random access signals. At this time, at least two random access signals having the same priority can be transmitted using the same code as the first random access parameter and by setting at least one second random access parameter to be different from each other. Here, the second random access parameter includes RAT, communication device, channel (frequency, time, antenna, etc.), power, transmission order, modulation parameters, coding parameters, length, bandwidth, processing gain and inclusion information.

 Seventh, the UE sets and transmits the antennas to mutually different at least two random access signals having different priorities.

When the UE transmits three random access signals, transmits a first random access signal and a second random access signal with a first order through a first antenna, and transmits a third random access signal Through the second antenna. At this time, the first random access signal and the second random access signal having the same priority are set so that the frequencies of the signals are different from each other, so that the random access target communication device can be distinguished. In this manner, the UE can transmit and receive at least two random access signals by setting the antennas to be different according to the priorities of the random access signals. At this time, at least two random access signals having the same priority can be transmitted using the same antenna as the first random access parameter and setting at least one second random access parameter different from each other. Here, the second random access parameter includes RAT, communication device, channel (frequency, time, code, etc.), power, transmission order, modulation parameters, coding parameters, length, bandwidth, processing gain and inclusion information.

Eighth, the UE sets and transmits power between at least two random access signals having different priorities.

When the UE transmits four random access signals, the first random access signal and the second random access signal assigned with the first rank are allocated and transmitted with a transmission power of 50 mW, and the third random access signal Signal is transmitted with a transmission power of 30 mW allocated and a fourth random access signal assigned with a third order is allocated with a transmission power of 10 mW. At this time, the first random access signal and the second random access signal having the same priority are set so that the channel group for each signal is different, and the random access target communication device transmits the first and second random access signals so that the random access target communication device can be distinguished. In this way, the UE can transmit and receive at least two random access signals by setting the power to be different according to the priority of each random access signal. At this time, the random access having the same priority is allocated to transmit power. At this time, the at least two random access signals having the same priority may use the same power as the first random access parameter, and may transmit and set at least one second random access parameter to be different from each other. Here, the second random access parameter includes a RAT, a communication device, a channel (frequency, time, code, antenna, etc.), transmission order, modulation parameter, coding parameter, length, bandwidth, processing gain and inclusion information.

Ninth, the UE sets and transmits at least two random access signals having different priorities in a different transmission order.

FIG. 6 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention transmit random access signals in a different order according to their priorities.

Referring to FIG. 6, when the UE transmits three random access signals, the UE transmits a first random access signal in a first order and a second random access signal in a second order, And transmits the third random access signal assigned in the third order in the third order. In this manner, the UE may transmit and transmit at least two random access signals by setting the transmission order to be different according to the priority order of the random access signals. At this time, at least two random access signals having the same priority order may be transmitted using the same transmission order as the first random access parameter and by setting at least one second random access parameter to be different from each other. Here, the second random access parameter includes RAT, communication device, channel (frequency, time, code, antenna, etc.), power, modulation parameters, coding parameters, length, bandwidth, processing gain and inclusion information.

 In the tenth, the UE sets and transmits modulation parameters mutually different between at least two random access signals having different priorities.

Table 1 below shows the modulation parameters of the random access signal according to the priority.

Referring to Table 1, when the UE transmits four random access signals, a first random access signal with a first order is modulated into a BPSK signal, and the second random access signal is transmitted with a second random number Modulates and transmits the access signal to the QPSK signal, and modulates the third random access signal and the fourth random access signal having the third order to a 16QAM signal. At this time, the third random access signal and the fourth random access signal having the same priority are set so that the frequencies of the signals are different from each other, and the random access target communication device transmits the signals so that the random access target communication device can be distinguished. Here, BPSK, QPSK, and 16QAM are modulation schemes as a practical example. Various modulation methods such as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), Quadrature Amplitude Modulation Of course, can be applied. In this manner, the UE can transmit and receive at least two random access signals by setting the modulation parameters to be different according to the order of the random access signal. At this time, at least two random access signals having the same priority can be transmitted using the same modulation parameters as the first random access parameter and by setting the at least one second random access parameter to be different from each other. Here, the second random access parameter includes RAT, communication device, channel (frequency, time, code, antenna, etc.), power, transmission order, coding parameters, length, bandwidth, processing gain and inclusion information.

Eleventh, the UE sets and transmits coding parameters mutually different between at least two random access signals having different priorities.

Table 2 below shows the coding parameters of the random access signal according to the priority order.

Referring to Table 2, when the UE transmits four random access signals, a first random access signal assigned a first rank is transmitted at a coding rate of 1/3, and a second random access signal assigned a second ranked Transmits a random access signal at a coding rate of 1/2, transmits a third random access signal at a coding rate of 2/3, and transmits a fourth random access signal at a coding rate of 4 / 5. Here, coding rates of 1/3, 1/2, 2/3, and 4/5 are applicable to various coding rates as one embodiment. Convolutional codes, turbo codes, LDPC codes, - It is obvious that you can apply various code methods such as Solomon code. In this manner, the UE can transmit and receive at least two random access signals by setting the coding parameters to be different according to the priority of the random access signal. At this time, at least two random access signals having the same priority can be transmitted using the same coding parameters as the first random access parameter and by setting the at least one second random access parameter to be different from each other. Here, the second random access parameter includes RAT, communication device, channel (frequency, time, code, antenna, etc.), power, transmission order, modulation parameters, length, bandwidth, processing gain and inclusion information.

The twelfth, the UE sets and transmits at least two random access signals having different priorities by setting the signal lengths to be different from each other.

FIG. 7 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention transmit random access signal lengths different in priority order.

Referring to FIG. 7, when the UE transmits four random access signals, the first random access signal assigned a first rank is transmitted in a signal having a length of 1 ms, and the second random access signal And the third random access signal and the fourth random access signal to which the third order is assigned transmit the signal with a length of 0.5 ms. At this time, the third random access signal and the fourth random access signal having the same priority are set so that the code for each signal is different, and the random access target communication device transmits the third random access signal and the fourth random access signal so that the random access target communication device can be distinguished. Here, it is a matter of course that various types of signal length such as duration, number of bits, and sequence length can be applied in addition to the length of the random access signal of 1 ms, 0.8 ms, and 0.5 ms. In this manner, the UE can transmit and receive at least two random access signals with different signal lengths according to the priority of the random access signal. At this time, at least two random access signals having the same priority may use the same signal length as the first random access parameter, and may transmit and set at least one second random access parameter different from each other. Here, the second random access parameter includes RAT, communication device, channel (frequency, time, code, antenna, etc.), power, transmission order, modulation parameters, coding parameters, bandwidth, processing gain and inclusion information.

 The thirteenth, the UE sets and transmits the bandwidths of at least two random access signals having different priorities different from each other.

8 is a diagram for explaining a random access method in which UEs in a mobile communication system according to an embodiment of the present invention transmit bandwidths of random access signals different in priority order.

Referring to FIG. 8, when the UE transmits four random access signals, the UE transmits a first random access signal with a first order through a bandwidth of 1 MHz, and transmits a second random access signal with a second order The third random access signal is transmitted through a bandwidth of 700 KHz, and the third random access signal is transmitted through a bandwidth of 500 KHz. At this time, the second random access signal and the third random access signal having the same priority are set so that the transmission order for each signal is different, so that the random access target communication device can be distinguished. In this manner, the UE can transmit and receive at least two random access signals with different bandwidths according to the priorities of the random access signals. At this time, at least two random access signals having the same priority may use the same bandwidth as the first random access parameter, and may transmit and set at least one second random access parameter different from each other. Here, the second random access parameter includes RAT, communication device, channel (frequency, time, code, antenna, etc.), power, transmission order, modulation parameters, coding parameters, length, processing gain and inclusion information.

In the fourteenth, the UE sets and transmits the at least two random access signals having different priorities so that the processing gains are different from each other.

When the UE transmits three random access signals, the first random access signal assigned first is transmitted to obtain a processing gain of 20 dB, and the second random access signal assigned second order transmits a 15 dB processing gain And the third random access signal having the third order is transmitted to obtain a processing gain of 10 dB. In this way, in transmitting at least two random access signals, the UE value can be set to be different according to the priority of the random access signal and transmitted. At this time, at least two random access signals having the same priority can use the same processing gain as the first random access parameter, and can transmit and set at least one second random access parameter to be different from each other. Here, the second random access parameter includes a RAT, a communication device, a channel (frequency, time, code, antenna, etc.), power, transmission order, modulation parameters, coding parameters, length, bandwidth and inclusion information.

The processing gain is an index indicating how widely a spreading code has spread by transmitting a random access signal through spread spectrum, and is defined as Equation (3) below.

는 확산된 신호의 대역폭이고,

는 원신호의 대역폭이다.
here,

Is the bandwidth of the spread signal,

Is the bandwidth of the original signal.

Fifteenth, the UE sets and transmits the inclusion information between at least two random access signals having different priorities.

Table 3 shows the included information of the random access signal according to the priority.

Referring to Table 3, when the UE transmits four random access signals, the UE transmits the first random access signal including the ID and the requested resource amount information to the first random access signal, Transmits ID information to the second random access signal, and transmits the third random access signal and the fourth random access signal without information included in the third random access signal. At this time, the third random access signal and the fourth random access signal having the same priority are set so that the processing gain for each signal is different, and the random access target communication device is transmitted so that it can be distinguished. Here, it is a matter of course that various information such as an ID, a required resource amount, a requested service, UE connection information (handover, initial connection, etc.) can be applied in addition to the ID and the requested resource amount as an example of information that can include the random access signal . In this manner, the UE can set and transmit the inclusion information according to the priority of the random access signal in transmitting at least two random access signals. At this time, the at least two random access signals having the same priority may include the same information as the first random access parameter, and may be transmitted by setting the at least one second random access parameter to be different from each other. Here, the second random access parameter includes a RAT, a communication device, a channel (frequency, time, code, antenna, etc.), power, transmission order, modulation parameters, coding parameters, length, bandwidth and processing gain.

 Sixteenth, the UE transmits at least two random access signals to at least one communication device in accordance with inclusion information in transmitting at least two random access signals. Here, whether or not information is included in each random access signal is considered. The following describes an embodiment in which the UE transmits at least two random access signals in consideration of information inclusion in transmitting at least two random access signals.

9 is a diagram for explaining a random access method for transmitting two random access signals that do not include information in a UE of a mobile communication system according to an embodiment of the present invention. Referring to FIG. 9, at least two random access signals Are transmitted.

Referring to FIG. 9, in transmitting two random access signals through the 4 < th > random access channel and the 7 < th > random access channel in the random access frame 1, the random access frames are transmitted without including information in each random access signal.

FIG. 10 is a diagram for explaining a random access method for transmitting two random access signals including the same information in a UE of a mobile communication system according to an embodiment of the present invention. In FIG. 10, at least two random access signals include the same information And then transmitted.

Referring to FIG. 10, in transmitting two random access signals through the 4 < rd > random access channel and the 9 < th > random access channel in the random access frame 1, the same random information is transmitted to each random access signal.

FIG. 11 is a diagram for explaining a random access method for transmitting two random access signals including different information in a UE of a mobile communication system according to an embodiment of the present invention. Referring to FIG. 11, And a case where the data is transmitted.

By sending different information, the communication device can be provided with additional information about the UE. In one example, the UE may prioritize the resource allocation by providing the communication device with information that it is a handover connection, or the UE may provide additional resource request information for control and / or data message transmission.

Referring to FIG. 11, in transmitting two random access signals through a seventh random access channel and a ninth random access channel in random access frame 1, each random access signal includes different information and is transmitted.

Next, transmission operations of at least two random access signals to which priority is given in step 200 of FIG. 1 will be described in detail with reference to FIGS.

A UE according to the present invention determines random access parameters and priority of a random access signal in consideration of at least one random access condition in order to perform random access to at least one communication device of at least one RAT, At least two random access signals having a unique priority for transmission to at least one communication device of the RAT. Here, the communication device includes a base station, a relay, and a femtocell base station. For convenience of explanation, in the following description, the UE determines an embodiment in which random access parameters and priority of a random access signal are determined so as to transmit three or less random access signals to each of three or less communication devices in order to perform random access The UE according to the present invention can transmit a plurality of random access signals to four or more communication devices and the UE can transmit four or more random access signals to one communication device.

12 is a diagram for explaining a random access method in which a UE transmits a random access signal to two communication devices in a mobile communication system according to an embodiment of the present invention. Of the random access signal.

Referring to FIG. 12, the UE 12a configured by the first RAT determines to simultaneously transmit one random access signal to two first base stations 12b and a second base station 12c configured as a first RAT. In this manner, the UE determines to transmit at least one random access signal to two communication devices, which are configured as one active RAT.

FIG. 13 is a diagram for explaining a random access method in which a UE transmits two random access signals to a single communication device in a mobile communication system according to an embodiment of the present invention. The UE transmits at least two random Access signals.

Referring to FIG. 13, the UE 13a configured as the first RAT transmits a random access signal determined as a first rank to a first base station 13b configured as a first RAT, and a random access signal . In this case, in the case of a UE using one active RAT, the RAT to be randomly accessed may be determined to be the first RAT, or the random access target RAT determination process may be omitted. In this way, the UE decides to transmit at least two random access signals to one communication device constituted by one active RAT.

14 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signal to each of two communication devices having the same RAT, And determines to transmit one random access signal to each of the communication devices.

Referring to FIG. 14, the UE 14a configured by the first RAT transmits a first random access signal determined as a first rank to the first base station 14b configured as the first RAT, And determines to transmit one random access signal determined to be the second rank to the base station 14b. In this case, in the case of a UE using one active RAT, the RAT to be randomly accessed may be determined to be the first RAT, or the random access target RAT determination process may be omitted. In this manner, the UE determines to transmit one random access signal to each of at least two communication devices configured with the same RAT. At this time, the UE may have a plurality of modems for connecting to a plurality of communication devices.

15 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signals to each of three communication devices having the same RAT, And determines to transmit one random access signal to each of the communication devices.

Referring to FIG. 15, the UE 15a configured by the first RAT transmits a first random access signal determined as the first rank to the first base station 15b configured as the first RAT, Transmits one random access signal determined as the second rank to the base station 15c and determines to transmit the third random access signal determined as the third rank to the third base station 15d configured as the first RAT. In this case, in the case of a UE using one active RAT, the RAT to be randomly accessed may be determined to be the first RAT, or the random access target RAT determination process may be omitted. In this manner, the UE determines to transmit one random access signal to each of at least three communication devices configured with the same RAT. At this time, the UE may have a plurality of modems for connecting to a plurality of communication devices.

16 to 18 illustrate an embodiment in which, in a mobile communication system according to an embodiment of the present invention, a UE determines to transmit at least one random access signal to each of at least two communication devices.

16 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of two communication devices having the same RAT.

Referring to FIG. 16, the UE 16a configured with the first RAT transmits three random access signals determined as the first rank to the first base station 16b configured as the first RAT, And determines to transmit to the base station 16c two random access signals determined to be second rank. In this case, in the case of a UE using one active RAT, the RAT to be randomly accessed may be determined to be the first RAT, or the random access target RAT determination process may be omitted. In this manner, the UE determines to transmit at least one random access signal to each of at least two communication devices configured with the same RAT. At this time, the UE may have a plurality of modems for connecting to a plurality of communication devices.

 FIG. 17 is a diagram illustrating a case where, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of two communication devices configured with the same RAT, and transmits one identical random access signal to two communication devices Fig. 2 is a diagram for explaining a random access method.

Referring to FIG. 17, a UE 17a configured by a first RAT transmits two random access signals to a first base station 17b configured as a first RAT, and a second base station 17c configured by a first RAT Decides to transmit two random access signals, and decides to transmit one random access signal which is simultaneously transmitted to the first base station 17b and the second base station 17c. In this manner, the UE determines to transmit at least one random access signal to each of at least two communication devices configured with the same RAT. At this time, the UE may have a plurality of modems for connecting to a plurality of communication devices.

18 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of three communication devices having the same RAT.

Referring to FIG. 18, a UE 18a configured by a first RAT transmits a random access signal determined as a first rank to a first base station 18b configured as a first RAT, The base station 18c transmits the two random access signals determined as the second rank, and transmits to the third base station 18d configured as the first RAT two random access signals determined as the third rank and one And determines to transmit the random access signal. In this case, in the case of a UE using one active RAT, the RAT to be randomly accessed may be determined to be the first RAT, or the random access target RAT determination process may be omitted. In this manner, the UE decides to transmit at least one random access signal to each of three communication devices configured with the same RAT. At this time, the UE may have a plurality of modems for connecting to a plurality of communication devices.

19 to 21 illustrate an embodiment in which, in a mobile communication system according to an embodiment of the present invention, a UE determines to transmit one random access signal to each of at least two communication apparatuses whose RATs are different from each other.

19 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signal to each of two communication apparatuses configured with different RATs,

Referring to FIG. 19, a UE 19a configured by a first RAT and a second RAT transmits a first random access signal determined as a first rank to a first base station 19b configured as a first RAT, To the second base station 19c, which is configured as a second random access signal. In this manner, the UE determines that the RAT sends one random access signal to each of at least two communication devices that are different from each other. At this time, the UE may have a plurality of RAT modems for connecting to a plurality of RATs.

FIG. 20 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signals to each of three communication devices configured with some different RATs.

Referring to FIG. 20, a UE 20a configured by a first RAT and a second RAT transmits a first random access signal determined as a first rank to a first base station 20b configured as a first RAT, To the second base station 20c configured as the first RAT, and to transmit one random access signal determined as the second rank to the third base station 20d configured as the second RAT . In this manner, the UE decides to transmit one random access signal to each of at least three communication devices configured with some different RATs. At this time, the UE may have a plurality of RAT modems for connecting to a plurality of RATs.

FIG. 21 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits one random access signals to each of three communication devices having different RATs.

Referring to FIG. 21, the UE 21a configured by the first RAT, the second RAT, and the third RAT transmits a first random access signal determined as the first rank to the first base station 21b configured as the first RAT , Transmits a random access signal determined as the second rank to the second base station 21c configured as the second RAT, and transmits a random access signal determined as the third rank to the third base station 21d configured as the third RAT . In this way, the UE decides to transmit one random access signal to each of at least three communication devices, which are composed of different RATs. At this time, the UE may have a plurality of RAT modems for connecting to a plurality of RATs.

22 to 25 illustrate an embodiment in which, in a mobile communication system according to an embodiment of the present invention, a UE determines to transmit at least one random access signal to each of at least two communication apparatuses whose RATs are different from each other.

22 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of two communication apparatuses configured with different RATs.

22, the UE 22a configured by the first RAT and the second RAT transmits to the first base station 22b configured as the first RAT two random access signals determined as the first rank and a second random access signal determined as the second rank Transmits a random access signal, and determines to transmit, to the second base station 22c configured as the second RAT, one random access signal determined as the third rank and one random access signal determined as the fourth rank. In this manner, the UE determines to transmit at least one random access signal to each of at least two communication devices configured with different RATs. At this time, the UE may have a plurality of RAT modems for connecting to a plurality of RATs.

23 is a diagram for explaining a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of three communication devices configured with some different RATs.

Referring to FIG. 23, a UE 23a configured by a first RAT and a second RAT transmits a first random access signal determined as a first rank to a first base station 23b configured as a first RAT, To the second base station 23c configured as a second RAT, and transmits to the third base station 23d configured as the second RAT two random access signals determined as the third rank and a fourth rank determined as the fourth rank Lt; RTI ID = 0.0 > 1 < / RTI > In this manner, the UE determines to transmit at least one random access signal to each of at least three communication devices, which are configured with some different RATs. At this time, the UE may have a plurality of RAT modems for connecting to a plurality of RATs.

24 is a diagram for explaining a random access method in which a UE transmits a plurality of random access signals to each of three communication apparatuses having different RATs in a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 24, a UE 24a configured by a first RAT, a second RAT, and a third RAT transmits a first random access signal determined as a first rank to the first base station 24b configured as a first RAT , Transmits the two random access signals determined as the second rank to the second base station 24c configured as the second RAT, and transmits the three random access signals determined as the third rank to the third base station 24d configured as the third RAT . In this manner, the UE determines to transmit at least one random access signal to each of at least three communication devices configured with different RATs. At this time, the UE may have a plurality of RAT modems for connecting to a plurality of RATs.

25 is a diagram illustrating a random access method in which, in a mobile communication system according to an embodiment of the present invention, a UE transmits a plurality of random access signals to each of two communication devices configured as a first RAT and two communication devices configured as a second RAT Fig.

Referring to FIG. 25, a UE 25a configured by a first RAT and a second RAT transmits three random access signals determined as a first rank to a first base station 25b configured as a first RAT, Transmits to the second base station 25c configured as a second RAT, two random access signals determined to be in the second order, transmits to the third base station 25d configured as the second RAT, two random access signals determined in the third order, And determines to transmit the three random access signals determined as the fourth rank to the fourth base station 25e composed of two RATs. In this way, the UE determines to transmit at least one random access signal to each of at least four communication devices. At this time, the UE may have a plurality of RAT modems for connecting to a plurality of RATs.

Next, a random access control operation will be described in detail using at least two random access response signals in step 400 of FIG.

The random access control method according to the present invention performs random access control by selecting some or all of at least two random access response signals received from at least one communication device in response to at least one random access signal transmitted by the UE . Wherein the random access response signal includes no response from the at least one random access target communication device. The non-response includes a collision of random access signals from at least one different UE, an admission rejection from a random access target communication device, a random access signal due to a channel status failure, or a loss of a random access response signal. The UE selects some or all of the at least two random access response signals (including no answer) considering at least one of the consideration conditions for random access response signal selection. The consideration conditions for the random access response signal selection include RAT, expected QoS, signal strength, transmission priority, whether or not the same RAT response signal and the same communication device response signal are included.

(1) Consideration conditions for random access response signal selection

First, the RAT consideration condition is a condition for the RAT constituting the communication device that transmitted the random access response signal, and the UE selects the random access response signal considering the expected price based on the use of the RAT and the expected QoS that can be provided .

For example, when the UE selects the random access response signal considering the RAT according to the expected price, the service request is guaranteed in the order of the lowest expected price among the random access response signals received from the target communication devices composed of various RATs At least one random access response signal is selected.

Second, the expected QoS is an expected QoS that can be provided by the communication apparatus that has transmitted the random access response signal, and the UE selects the random access response signal considering the expected QoS according to the expected delay, the expected throughput, the expected error rate,

For example, when the UE selects the random access response signal considering the RAT according to the expected throughput, the random access response signals received from the target communication devices configured with the various RATs are transmitted in the order of the service request At least one random access response signal is selected.

In another example, when the UE selects the random access response signal considering the RAT according to the expected delay, the random access response signals received from the target communication devices configured with the various RATs are transmitted in the order of decreasing the expected delay, At least one random access response signal is selected.

As another example, when the UE selects the random access response signal considering the RAT according to the predicted error rate, the random access response signals received from the target communication apparatuses configured with various RATs are classified into the service request condition At least one random access response signal is selected.

Third, the signal strength is the received signal strength from the communication device that transmitted the random access response signal, and the UE selects the random access response signal in consideration of the signal strength according to RSSI, SNR, SINR, and the like.

For example, when the UE selects the random access response signal considering the signal strength according to the SNR, the random access response signals received from the target communication devices are transmitted in the order of at least one random And selects an access response signal.

Fourth, the transmission priority is a priority assigned to the at least two random access signals by the UE when the UE transmits at least two random access signals, .

For example, when the UE selects the random access response signal considering the transmission priority, at least one random access response signal is transmitted in order from the highest priority among the random access response signals received from the target communication devices, Select the response signal.

Fifth, the same RAT response signal indicates whether the UE selects the random access response signal considering the number of response signals from the communication devices using the same RAT.

For example, when the UE selects the random access response signal considering the same RAT response signal, the response from the communication devices using the same RAT among the random access response signals received from the target communication devices composed of various RATs At least one random access response signal is selected to preferentially service the response signals from the communication devices using the RAT having a large number of signals.

In another example, when the UE selects the random access response signal in consideration of whether or not the same RAT response signal is received, the random access response signals received from the communication devices using the same RAT among the random access response signals received from the target communication devices composed of various RATs At least one random access response signal is selected so as to guarantee the service requirement in preference to the response signals from the communication apparatuses using the RAT having a small number of response signals.

As another example, when the UE selects the random access response signal in consideration of whether the same RAT response signal is received, the UE selects random access response signals from the communication devices using the same RAT among the random access response signals received from the target communication devices composed of various RATs Only one random access response signal is selected so as to guarantee the service requirement for the response signals of < RTI ID = 0.0 >

Sixth, whether or not the same communication device response signal is selected is that the UE selects a UE random access response signal considering the number of response signals from the same communication device.

For example, when the UE selects the random access response signal in consideration of whether or not the same communication device response signal is received, a response from the communication device having a large number of response signals from the same communication device among the random access response signals received from the target communication devices Selects at least one random access response signal to ensure that the signals preferentially service requirements.

For example, when the UE selects the random access response signal in consideration of whether or not the same communication apparatus response signal is received, a random access response signal from the communication apparatus having a small number of response signals from the same communication apparatus among the random access response signals received from the target communication apparatuses And selects at least one random access response signal such that the response signals preferentially guarantee the service requirement.

As another example, when the UE selects the random access response signal in consideration of whether or not the same communication apparatus response signal is received, the response request signal from the same communication apparatus among the random access response signals received from the target communication apparatuses, Only one random access response signal is selected.

(2) Service requirements

The service requirement is a parameter required to smoothly provide a service requested by a user to a user, and includes a traffic class, a quality of experience (QoE), and QoS.

The traffic class includes a large capacity file, a voice call, a video call, a video streaming, a web browsing, a game and the like, and the QoE includes a MOS (Mean Opinion Score), a hosting efficiency, an R- Time, data rate, download time, and the like.

In the traffic class, the MOS is a value indicating a service quality in consideration of a person's recognition characteristic, the call disability is a probability of occurrence of a voice call disabled state, and the R- It is a quality indicator that expresses the quality that can be felt in. The initial buffering time is a time taken until the initial buffering service is provided from the time when the user requests the video streaming service. The jerkiness is a measure Value. The page response time is a time from a time when a user requests a web page to a time when a page is provided. The data transfer rate is a data transfer amount per unit time, and the download time is a total time taken to receive a request file.

The QoS includes playout, transmission delay, error rate, packet loss, jitter, and the like.

The error rate is a bit error rate (BER), a bit error rate (BLER), a bit error rate (BER), and a bit error rate (Block Error Rate), a Frame Error Rate (FER), a Packet Error Rate (PER), and the like. The packet loss is a probability of packet loss occurring at the time of packet transmission, and the jitter is a variance of the arrival time interval of the packet, and is an index indicating the degree of change of arrival time of the packet.

(3) Connection setting target communication device selection strategy process

Wherein the UE is configured to receive at least one random access response signal in response to at least one random access signal transmitted by the UE from among at least one of the communication devices that have transmitted at least two random access response signals, And selects at least one random access response signal received from the connection target communication device and the at least one connection target communication device.

In a first strategy, at least one connection configurable communication device is first selected using at least two random access response signals (including non-response) received by the UE, and at least one connection configurable communication device is selected from the at least one connection configurable communication device The at least one random access response signal received from the at least one connection setting target communication device and the at least one connection setting target communication device can be selected in consideration of the response signal considering condition.

- Connection configurable communication device selection strategy

The UE selects all of the communication devices that have transmitted at least one random access response signal that has succeeded in random access among the at least two random access response signals (including non-response) to the connection establishable communication device, And selects at least one random access response signal received from the random access response signal.

The UE has succeeded in random access among at least two random access response signals (including non-response), and considering at least one response signal consideration condition, each of the at least one response signal considerations satisfies a random access response signal And selects at least one random access response signal received from the selected communication devices.

For example, when a minimum required throughput is selected as the QoS requirement among the random access response signals received from the target communication devices, all the communication devices that have transmitted the random access response signal satisfying the minimum required throughput Selectable as a connection configurable communication device and selects at least one random access response signal received from the selected connection configurable communication devices.

- Selection strategy of the random access response signal with the target communication device

When one communication device is selected in the connection establishable communication device selection process, the communication device is selected as the communication device subject to connection setting, and at least one response signal considering condition is taken into consideration, And selects one random access response signal.

The UE determines at least one response signal considering condition of at least one of the at least two connection establishable communication devices so that each of the at least one response signal considerations satisfies at least one connection setting And selects at least one random access response signal received from the target communication device and the selected at least one connection target communication device.

In this case, when the UE considers the RAT consideration condition as a response signal requirement, the UE transmits at least one connection setting target communication device configured by the first RAT among the at least two connection establishable communication devices, And selects at least one random access response signal received from the random access response signal.

At this time, when the UE considers the transmission delay as a response signal requirement condition, the UE determines that at least one of the at least two connection establishing communication devices satisfying the required transmission delay (for example, 30 ms) And selects at least one random access response signal received from at least one connection setting target communication device.

The UE ensures user requirements in the order of the highest or lowest condition for each of the at least one response signal considering conditions, considering at least one response signal consideration condition of at least two connection-configurable communication devices And selects at least one random access response signal received from at least one connection target communication device that has transmitted the random access signal and the selected at least one connection target communication device.

At this time, the UE has at least one connection setting target communication device that guarantees the service requirement in the order of the lowest expected price among the at least two connection setting available communication devices, and at least one random access received from the selected at least one connection setting target communication device Select the response signal.

At this time, the UE has at least one connection setting target communication device that guarantees the service requirement in the order of high expected throughput among the at least two connection setting capable communication devices, and at least one random number received from the selected at least one connection setting target communication device And selects an access response signal.

In the following example, a connection establishable communication device is selected, and a strategy of selecting a random access response signal with the communication device to be connected is described.

For example, when at least two communication devices constituted by different RATs are targeted for random access, the random access response signals (including non-responses) received from the communication devices constituted by the same RAT for a single RAT are used first A set of connection establishable communication apparatuses is selected in consideration of the signal strength and the expected QoS of the communication apparatuses of the RAT, and connection establishment for each RAT is possible for all the RATs in this manner. . Next, random access response signals received from the at least one connection establishing communication device and at least one connection establishing communication device in consideration of a service requirement or the like, using the random access response signals received from the connection establishing communication devices Non-response) of the random access response signal.

In a second strategy, at least one random access response received from the at least one connection establishment target communication device and at least one connection establishment target communication device using at least two random access response signals (including non-response) The signal can be selected.

- UE considers at least one response signal consideration condition of at least one of the communication devices which transmitted at least one random access response signal that has succeeded in random access, And selects at least one random access response signal received from at least one connection target communication device that has transmitted the signal and the selected at least one connection target communication device.

- UE considers at least one response signal consideration condition of at least one of the communication devices that transmitted the random access response signal that has succeeded in random access, And selects at least one random access response signal received from at least one connection setting target communication device that has transmitted the random access signal that guarantees the user requirement in descending order and the selected at least one connection setting target communication device.

For example, the at least two random access signals (including non-response) received from the connection establishing communication device and the connection establishing communication device using at least two random access response signals (including no answer) received from one communication device The at least one random access response signal.

As another example, it is possible to use at least two random access response signals (including non-response) received from a plurality of communication devices composed of the same synchronized RAT, And selects at least one random access response signal from the random access signals (including non-response) received from the device.

As another example, after receiving all response signals (including non-response) from each of a plurality of communication apparatuses configured with the same RAT that are not synchronized, all of the response signals (including non-response) Selects at least one random access response signal from random access signals (including non-responses) received from the communication device and the at least one connection target communication device.

In another example, after receiving all the random access response signals (including non-response) from a plurality of random access target communication devices composed of various RATs, at least one of the random access response signals And selects at least one random access response signal received from each of the one connection setting target communication device and the at least one connection setting target communication device. At this time, because the UE may receive a random access response signal for each RAT or each communication device, the UE may receive a random access response signal for at least two random access signals transmitted to the at least two random access target communication devices, And selects at least one random access response signal received from at least one connection setting target communication device and the at least one connection setting target communication device.

(4) A random access control operation using a random access response signal will be described.

- Random Access Completion Judgment

(E.g., a collision of random access signals from at least one other UE, an acknowledgment from a random access target communication device, a random access signal due to a channel status failure, or a loss of a random access response signal) among the random access response signals At least one connection establishing communication device that has transmitted a random access response signal satisfying a service requirement among the random access response signals that have succeeded in random access, excluding the random access response signals, And selecting at least one random access response signal from the random access response signal.

- Connection settings

And performing a subsequent procedure for establishing a connection to at least one connection target communication apparatus selected according to the random access completion determination result.

- Additional random access transmission

In accordance with the result of the random access completion judgment, transmit at least one random access signal again to the at least one random access target communication device in which a collision has occurred in order to satisfy the service requirement, And transmitting a single random access signal. At this time, at least one of the RAT set, the communication device set, the random access signal number, the priority, and the random access parameter is determined in consideration of the random access condition according to the random access control procedure.

26 is a diagram illustrating a random access procedure in a mobile communication system according to an embodiment of the present invention. Referring to FIG. 26, when at least one communication device receives a random access signal transmitted by a UE without collision, the corresponding communication device transmits a random access response message including uplink resource allocation information. Upon receiving the random access response message, the UE transmits an L2 / L3 message using uplink resources allocated by the corresponding communication device.

As an example of a method of transmitting at least two random access signals including different information, at least two random access signals including different information are transmitted to at least one communication device < RTI ID = 0.0 >Lt; / RTI > When at least one of the communication devices receives all or some of the random access signals and acquires the requested resource amount information of the UE, the corresponding communication device transmits the requested resource amount for L2 / L3 message transmission through the random access response to the UE Can be assigned.

In another example, if the UE transmits a plurality of random access signals without collision and acquires additional resources for L2 / L3 message transmission, it transmits an additional message such as a security message or the like together with a basic connection request message to the L2 / L3 message .

FIGS. 27A to 27J are diagrams of various UEs for performing the same operations as in FIG. 1 in a mobile communication system according to an embodiment of the present invention.

The UE includes a random access control unit for controlling random access using at least two random access signals. The random access control of the UE determines at least one of the number, priority, and random access parameters of the at least two random access signals to transmit at least one random access signal having a priority that is unique to the at least one communication device do.

A control structure for random access control in a UE, which can be variously configured through Figs. 27A to 27J, will be described.

27A is a configuration diagram of a UE of a mobile communication system according to the first embodiment of the present invention.

Referring to FIG. 27A, the UE includes a random access control unit a-1 and one communication device individual random access control unit a-2.

The random access control unit (a-1) controls random access to one communication apparatus constituted by one RAT by controlling one communication apparatus individual random access control unit (a-2). It goes without saying that the RAT can be changed depending on the function.

27B is a configuration diagram of a UE of a mobile communication system according to a second embodiment of the present invention.

Referring to FIG. 27B, the UE includes a multiple apparatus random access control unit b-1 and L communication apparatus individual random access control units b-2.

The multiple apparatus random access control unit (b-1) controls random access to a plurality of communication apparatuses by jointly controlling L communication apparatus individual random access control units (b-2). At this time, the communication apparatus individual random access control is possible irrespective of the RAT constituting each of the communication apparatuses.

The L communication apparatus individual random access control units (b-2) perform a random access control function for each of the L communication apparatus under the control of the multiple apparatus random access control unit (b-1).

FIG. 27C is a configuration diagram of a UE of a mobile communication system according to a third embodiment of the present invention.

 Referring to FIG. 27C, the UE includes a multi-device random access control unit c-1, N RAT individual random access control units c-2, and L communication device individual random access control units c- .

Wherein the N RAT individual random access control units c-2 are located between the multiple apparatus random access control unit c-1 and the L communication apparatus individual random access control units c-3, Controls random random access.

The multi-device random access control unit (c-1) controls random access to communication devices constituted by various RATs by jointly controlling the N RAT individual random access control units (c-2).

The N RAT individual random access control units (c-2) perform a random access control function for each of the N RATs under the control of the multi-device random access control unit (c-1).

Each of the N RAT individual random access control units (c-2) combines and controls at least one communication device individual random access control unit included in the corresponding RAT individual random access control unit, so that a plurality of communication devices Lt; / RTI >

The L communication apparatus individual random access control units (c-3) perform a random access control function for each of the L communication apparatus under the control of the corresponding RAT individual random access control unit.

FIG. 27D is a configuration diagram of a UE of a mobile communication system according to the fourth embodiment of the present invention. FIG.

Referring to FIG. 27D, the UE includes a multi-device random access controller d-1 and N RAT individual random access control units d-2.

The multi-device random access control unit (d-1) controls the random access to the communication devices composed of various RATs by jointly controlling the N RAT individual random access control units.

The N RAT individual random access control units (d-2) perform a random access control function for each of the N RATs under the control of the multi-device random access control unit (d-1).

Also, each of the N RAT individual random access control units (d-2) includes a random access control function for the communication devices constituted by the corresponding RAT. Therefore, each of the N RAT individual random access control units (d-2) integrally performs a random access control function for a plurality of communication devices constituted by the corresponding RAT, For example.

FIG. 27E is a configuration diagram of a UE of a mobile communication system according to a fifth embodiment of the present invention. FIG.

Referring to FIG. 27E, the UE includes a multiple apparatus random access control unit e-1 and L communication apparatus individual random access control units e-2.

The multiple apparatus random access control unit e-1 controls random access to a plurality of communication apparatuses by jointly controlling L communication apparatus individual random access control units e-2.

Also, the multi-device random access controller e-1 includes a random access control function for the corresponding RAT. Therefore, the multi-device random access controller e-1 controls the random access to a plurality of communication devices constituted by the RAT by integrally performing a random access control function for the communication devices constituted by the corresponding RAT.

 The L communication apparatus individual random access control units e-2 perform a random access control function for each of the L communication apparatus under the control of the multi-apparatus random access control unit e-1.

FIG. 27F is a configuration diagram of a UE of a mobile communication system according to a sixth embodiment of the present invention.

Referring to FIG. 27F, the UE includes a multiple apparatus random access control unit f-1 and L communication apparatus individual random access control units f-2.

The multi-device random access controller f-1 includes N RAT individual random access control functions. Therefore, the multi-device random access controller f-1 controls the random access by integrally performing a plurality of RAT individual random access controls.

At this time, each of the N RAT individual random access control functions included in the multi-device random access controller f-1 performs a random access control function for at least one communication device with each RAT.

Therefore, in accordance with the N RAT individual random access control functions included in the multi-device random access controller f-1, the multi-device random access controller f-1 transmits a random access control signal to a plurality of communication devices And controls random access to at least one communication device with each RAT.

The L communication apparatus individual random access control units f-2 are connected to a plurality of communication apparatuses constituted by respective RATs under the control of a corresponding RAT individual random access control function included in the multiple apparatus random access control section f- And performs a random access control function with respect to each of the plurality of memory cells.

FIG. 27G is a configuration diagram of a UE of a mobile communication system according to a seventh embodiment of the present invention.

Referring to FIG. 27G, the UE includes a multiple device random access controller g-1 and L communication device individual random access control functions g-2.

The multi-device random access controller f-1 includes N RAT individual random access control functions. Therefore, the multi-device random access controller f-1 controls the random access by integrally performing a plurality of RAT individual random access controls.

According to the N RAT individual random access control functions included in the multi-device random access controller g-1, the multi-device random access controller g-1 transmits individual Random Access Control Control functions to control random access to a plurality of communication devices constituted by each RAT.

The L communication apparatus individual random access control functions g-2 are controlled by a plurality of communication apparatuses constituted by respective RATs under the control of a corresponding RAT individual random access control function included in the multiple apparatus random access control unit f- As shown in FIG.

27H is a configuration diagram of a UE of a mobile communication system according to an eighth embodiment of the present invention.

Referring to FIG. 27H, the UE includes only a multi-device random access controller h-1, and the multi-device random access controller h-1 transmits a random access control function for the corresponding RAT and L communications And a random access control function for each of the devices.

The multi-device random access controller h-1 controls the random access by integrally performing RAT individual random access control and individual random access control for the communication devices constituted by the RAT.

It is not necessary to distinguish between the separate RAT individual random access control function and the communication device individual random access control function since the random access control section (h-1) integrally performs the RAT individual random access control function and the communication device individual random access control function .

271 is a configuration diagram of a UE of a mobile communication system according to a ninth embodiment of the present invention.

Referring to FIG. 27I, the UE includes only a multi-device random access controller h-1, and the multi-device random access controller h-1 includes random access control functions for N RATs and L And a random access control function for each of the communication devices.

The multi-device random access controller h-1 controls random access by integrally performing N RAT individual random access control functions and individual random access control functions for communication devices composed of L RATs.

It is unnecessary to distinguish between the separate RAT individual random access control function and the communication device individual random access control function since the random access control function (i-1) integrally performs the RAT individual random access control function and the communication device individual random access control function .

27J is a configuration diagram of a UE of a mobile communication system according to a tenth embodiment of the present invention.

Referring to FIG. 27J, the UE includes only a multi-device random access controller j-1, and the multi-device random access controller j-1 has a random access control function for each of the L communication devices, .

The multiple apparatus random access control unit (j-1) integrally controls the L communication apparatus individual random access controls, thereby controlling random access to a plurality of communication apparatuses. At this time, the communication apparatus individual random access control is possible irrespective of the RAT constituting each of the communication apparatuses.

Meanwhile, when the random access method according to the present invention is applied to the TDMA scheme (including the CSMA scheme), a random access channel composed of time resources can be used.

When the random access method according to the present invention is applied to the FDMA scheme (including the OFDMA scheme), a random access channel composed of frequency resources is used.

In addition, when the random access method according to the present invention is applied to the CDMA scheme, a random access channel composed of code resources can be used, and in addition, a random access channel combining two resources can be used.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, and equivalents thereof.

Claims (111)

A random access method of a user equipment (UE) in a mobile communication system,
Generating at least two random access signals having a transmission priority;
Transmitting the at least two random access signals to at least one target communication node based on a transmission priority for completing a first attempt random access transmission,
Wherein the generating of the at least two random access signals having the transmission priority comprises:
Setting a transmission priority for each of the at least two random access signals based on a random access condition; and
And determining at least one random access parameter in each of the at least two random access signals according to the set transmission priority,
Wherein the random access parameter comprises at least one of a radio access technology (RAT) for each signal, a target communication node for each signal, a channel for each signal, a channel group for each signal, power for each signal, A modulation parameter for each signal, a coding parameter for each signal, a length for each signal, a bandwidth for each signal, a processing gain for each signal, and information contained in each signal,
Wherein the channel for each signal comprises at least one of a frequency channel, a time channel, a code channel and an antenna,
The random access condition includes at least one of a RAT preference, a service use price, an adjacent network list rank, a channel condition, a requested bandwidth condition, a requested rate condition, a requested error rate condition, a connection condition, a random access target RAT type, At least one of a usage bandwidth, a distance between the random access target communication device and the UE, a random access target communication device load ratio, collision channel information, and a collision probability,
Wherein the channel condition comprises at least one of a channel characteristic quality factor and a spatial characteristic quality factor,
Wherein the transmission priority of the at least one random access signal of the at least two random access signals is different from the transmission priority of the remainder of the at least two random access signals.
The method according to claim 1,
Wherein the transmission priority is set to the at least two random access signals in response to a request of at least one target communication node for random access.
delete delete The method according to claim 1,
And transmitting the at least two random access signals to at least two communication devices.
6. The method of claim 5,
Transmitting the at least two random access signals to the at least two communication devices;
And transmitting at least one random access signal to each or some or all of the at least two communication devices.
delete 6. The method of claim 5,
Transmitting the at least two random access signals to the at least two communication devices;
And determining the at least two random access signals by integrally or jointly controlling random access control for the at least two communication devices,
Characterized in that said aggregation control performs an aggregate random access control for a plurality of communication devices and said aggregation control performs random access control by combining individual random access control functions for a plurality of communication devices / RTI >
A random access method of a user equipment (UE) in a mobile communication system,
Generating at least two random access signals having a transmission priority;
Transmitting the at least two random access signals to at least two target communication nodes based on a transmission priority for completing a first attempt random access transmission;
Selecting at least one of the random access response signals received in response to the at least two random access signals,
And performing random access control for the first attempt random access using the selected at least one random access response signals,
Wherein the generating of the at least two random access signals having the transmission priority comprises:
Setting a transmission priority for each of the at least two random access signals based on a random access condition; and
And setting at least one random access parameter in each of the at least two random access signals according to the set transmission priority,
Wherein the at least one random access parameter set in each of the at least two random access signals is different,
Wherein the selected random access response signals include at least one of a RAT, an expected QoS, a signal strength, a transmission priority of a random access signal, a random access response signal number from the same RAT, and a random access response signal number from the same communication node,
Wherein the transmission priority of the at least one random access signal of the at least two random access signals is different from the transmission priority of the remaining of the at least two random access signals.
delete delete delete A random access apparatus of a user equipment (UE) in a mobile communication system,
Generating at least two random access signals having a transmission priority,
Transmitting the at least two random access signals based on a transmission priority for completing a first attempt random access transmission,
Select at least one random access response signal received in response to the at least two random access signals,
And a computer readable medium having computer executable instructions for controlling the user terminal to perform random access control for the first attempt random access using the selected at least one random access response signal. / RTI >
Wherein the multi-device random access controller comprises:
Setting transmission priority in each of the at least two random access signals based on a random access condition,
Sets at least one random access parameter in each of the at least two random access signals according to the set transmission priority, the at least one random access parameter set in each of the at least two random access signals is different,
At least one of the at least two random access response signals includes at least one of a RAT, an expected QoS, a signal strength, a transmission priority for a random access signal, a random access response signal number from the same RAT, Selected according to at least one,
Wherein the transmission priority of at least one of the at least two random access signals is different from the transmission priority of the remainder of the at least two random access signals.
14. The method of claim 13,
Selecting at least one of the random access response signals received in response to the at least two random access signals,
Wherein at least one random access response signal is received from each of at least two communication nodes or at least two random access response signals are received from one communication node.
delete 14. The apparatus of claim 13, wherein the multi-device random access controller comprises:
The transmission priority may be determined based on at least one of RAT preference, service use price, adjacent network list rank, channel condition, bandwidth, transmission rate, error rate, access condition, random access target RAT type, random access target communication device type, The distance between the communication device and the UE, the load factor of the random access target communication device, the collision channel information, and the collision probability,
Wherein the channel condition comprises at least one of a channel specific quality factor and a spatial characteristic quality factor,
Wherein the collision probability is a probability that a channel collision occurs in a previous random access frame of a target communication node for random access or an occurrence probability of occurrence of a channel collision.
14. The method of claim 13,
The multi-device random access controller
A computer readable medium comprising computer executable instructions for controlling the user terminal to transmit the at least two random access signals to at least two communication nodes.
The method according to claim 1,
The channel quality factor may be a received signal strength indicator (RSSI), a signal-to-noise ratio (SNR), a signal-to-interference plus noise ratio (SINR) , Elements that are determined by channel characteristics such as inefficiency and fading, path fading, shadowing, delay spread, multipath, intra-cell interference, adjacent-cell interference, Doppler effect, antenna gain and channel collision To the UE.
The method according to claim 1,
Wherein the collision probability is defined as a ratio of the number of collided channels to the total number of random access channels or is defined as a ratio of the number of collided channels to the number of random access channels used.
The method according to claim 1,
The spatial property-quality factor is a quality factor for additionally considering spatial characteristics for the channel quality-quality factor when signals are transmitted in a multi-user group using multiple antennas,
Wherein the spatial feature-quality factor comprises at least one of a user channel, a correlation between antennas, a rank of a channel matrix, and a channel quality parameter according to a stream.
A random access method of a user terminal in a mobile communication system,
Generating at least two random access signals having a transmission priority;
Transmitting the at least two random access signals to at least two target communication nodes based on a transmission priority for completing a first attempt random access connection,
Wherein the step of generating a plurality of random access signals having the transmission priority comprises:
Setting transmission priority for each of the at least two random access signals based on a random access condition;
Setting at least one random access parameter in each of the at least two random access signals according to the set transmission priority, the at least one random access parameter set in each of the at least two random access signals being different from each other, / RTI >
The transmission priority is determined based on at least one of an available RAT type, a number of available communication nodes for each RAT, availability for each communication node, and load for each communication node,
Wherein the transmission priority of the at least one random access signals of the at least two random access signals is different from the transmission priority of the remainder of the at least two random access signals.
An apparatus for performing a random access of a user terminal in a mobile communication system,
Generating at least two random access signals having a transmission priority and transmitting the at least two random access signals to at least two target communication nodes based on the transmission priority to complete a first attempt random access transmission, - a multi-node random access control comprising a computer readable medium comprising executable instructions,
Wherein the multi-node random access controller comprises:
Setting a transmission priority for each of the at least two random accesses based on the random access condition,
Sets at least one random access parameter in each of the at least two random access signals according to the set transmission priority, the at least one random access parameter set in each of the at least two random access signals is different,
Wherein the transmission priority of the at least one random access signal of the at least two random access signals is different from the transmission priority of the remainder of the at least two random access signals.
23. The method of claim 22,
Wherein the transmission priority is determined based on at least one of an available RAT type, a number of available communication nodes for each RAT, availability for each communication node, and load for each communication node. / RTI >
The method according to claim 1,
The transmission priority includes at least one of a RAT preference, a service fee, a neighbor list, a channel condition, a bandwidth, a transmission rate, an error rate, a type of a target RAT for random access, a type of a target communication node for random access, Is determined based on at least one of a distance between the user terminal and the target communication node for random access, a load factor of the target communication node for random access, information on the collided channel, and a collision probability,
Wherein the channel condition comprises at least one of a channel characteristic quality factor and a spatial characteristic quality factor,
Wherein the collision probability is a probability that a channel collision occurs in a previous random access frame of a target communication node for random access, or is expressed by an average occurrence probability of a channel collision.
The method of claim 22, wherein
The transmission priority includes at least one of RAT preference, service charge, adjacent network list rank, channel condition, bandwidth, transmission rate, error rate, access condition, type of target RAT for random access, type of target communication node for random access, Is determined by at least one consideration of the target communication node for the random access, the load factor of the target communication node for the random access, information about the collided channel and the collision probability,
Wherein the channel collision comprises at least one of a channel characteristic quality factor and a spatial characteristic quality factor,
Wherein the collision probability is expressed as a probability that a channel collision occurs in a previous random access frame of a target communication node for random access or a channel collision average occurrence probability. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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