TW201325295A - Mobile communication devices, radio base stations, multi-carrier systems, and methods for handling random access failures - Google Patents

Abstract

A wireless communications device with a wireless module and a controller module is provided for handling random access failures in a multi-carrier system. The wireless module is configured to perform wireless transmission and reception to and from a cellular station. The controller module is configured to perform operations of a Media Access Control (MAC) layer, including performing a retry of a random access procedure on a carrier frequency with the cellular station via the wireless module, and stopping the retry of the random access procedure in response to the retry of the random access procedure being failed or in response to receiving a message from the cellular station via the wireless module.

Description

Apparatus, system, and method for handling random access failure

The present invention is primarily directed to techniques for handling random access failures, and more particularly to methods and corresponding mobile communication devices, radio access base stations, and multi-carrier systems for handling random access failures in a multi-carrier system.

In order to cope with the increasing demand for high transmission rates, a technology called Carrier Aggregation (CA) has been developed in the field of wireless communication, which can integrate radios of carrier frequency (CF). Resources effectively provide higher bandwidth to the user, especially in situations where it is difficult to achieve continuous and wide bandwidth, carrier aggregation technology can achieve the highest benefits. Briefly, carrier aggregation techniques refer to the integration of two or more frequency bands to provide a higher transmission/reception bandwidth. In general, each frequency band that is integrated can be referred to as a carrier frequency.

Specifically, each carrier frequency needs to be set and activated before it can be used for data transmission/reception. On the network side, the mobile station (MS) is set by Radio Resource Control (RRC) message ( Alternatively, it may be referred to as a carrier frequency that can be used by the user equipment (UE), and then a media access control (MAC) start command is transmitted to the mobile station to activate a certain carrier frequency. After the carrier frequency is started, the network can initiate a random access procedure on the carrier frequency to align the uplink timing, or request radio resources and the like. If the mobile station is set to be used If the carrier frequency is complex, the mobile station will likely have multiple random access procedures at the same time on multiple carrier frequencies or waiting to be performed.

The present invention is directed to the processing of random access program execution failures, and proposes a corresponding solution to coordinate random access procedures required for multiple different carrier frequencies.

An embodiment of the present invention provides a mobile communication device suitable for processing random access failures in a multi-carrier system, including a wireless module and a controller module. The wireless module is configured to perform wireless transmission and reception with a wireless access base station. The controller module is configured to perform the operation of the media access control layer, including: performing, by using the wireless module, a retry of a random access procedure with the wireless access base station on a carrier frequency, and When the retry of the random access procedure fails, or when receiving a message from the wireless access base station through the wireless module, the retry of the random access procedure is stopped.

Corresponding to the above mobile communication device, the present invention provides a method for processing random access failure, according to a media access control layer in a mobile communication protocol, and is applicable to a mobile communication device in a multi-carrier system, the above-mentioned processing random access The method of failure includes the steps of: performing a retry of a random access procedure with a radio access base station on a carrier frequency; and upon retrying the retry of the random access procedure, or receiving the above When one of the base stations wirelessly accesses the message, the retry of the random access procedure is stopped.

Another embodiment of the present invention provides a radio access base station, which is suitable for processing random access failures in a multi-carrier system, including a wireless module and A controller module. The wireless module is configured to perform wireless transmission and reception with a mobile communication device. The controller module is configured to perform a retry of a random access procedure with the mobile communication device on a carrier frequency through the wireless module, and detect a retry failure of the random access program And transmitting, by the wireless module, a message to the mobile communication device, so that the mobile communication device stops the retry of the random access procedure.

Corresponding to the foregoing wireless access base station, the present invention provides a method for processing random access failure, which is suitable for a radio access base station in a multi-carrier system, and the method for processing random access failure includes the following steps: at a carrier frequency Retrieving a random access procedure with a mobile communication device; and transmitting a message to the mobile communication device to detect the mobile communication device when the retry failure of the random access program is detected Stop the retry of the above random access procedure.

Yet another embodiment of the present invention provides a multiple carrier system suitable for handling random access failures, including a mobile communication device and a wireless access base station. The mobile communication device is configured to perform the operation of the media access control layer, including: performing a retry of a random access procedure on a carrier frequency, and when the retry of the random access procedure fails, or receiving When a message is received, the retry of the random access procedure described above is stopped. The wireless access base station is configured to transmit the message to the mobile communication device when detecting that the random access procedure fails to retry.

Corresponding to the above multiple carrier system, another embodiment of the present invention provides a method for processing random access failure, which is applicable to a multi-carrier system including a mobile communication device and a wireless access base station. The system is used to perform the operation of the media access control layer. The method for processing random access failure includes the following steps: performing, by the mobile communication device, a retry of a random access procedure with the radio access base station on a carrier frequency; detecting by the radio access base station Transmitting a message to the mobile communication device when the retry of the random access procedure fails; and stopping the randomization by the mobile communication device when the retry of the random access procedure fails or when the message is received Retry the access program.

With regard to other additional features and advantages of the present invention, those skilled in the art can use the mobile communication device, the wireless access base station, and the multi-carrier system disclosed in the implementation method of the present invention without departing from the spirit and scope of the present invention. And the method of dealing with random access failures to do a little change and refinement.

The present invention is described in the following paragraphs, and is intended to be illustrative of the present invention, and is intended to be illustrative of the scope of the invention, and the scope of the present invention is defined by the scope of the appended claims. .

1 is a schematic diagram of a multiple carrier system according to an embodiment of the invention. In the multi-carrier system 100, the mobile communication device 110 wirelessly connects to the service network 120 through an air interface to obtain wireless services, wherein the mobile communication device 110 and the service network 120 both support carrier aggregation technology and multiple carrier frequencies. . The service network 120 includes at least one access network 121 and a core network 122. Generally, the access network 121 is controlled by the core network 122 to provide wireless transmission and reception, and may include one or more. Wireless access base station, for example: base station (Base Station, BS), base station node (Node-B), or evolved base station node (evolved Node-B, eNB), etc., depends on the radio access technology (RAT) used by the service network. In particular, the random access procedure of the present invention is performed between the mobile communication device 110 and the wireless access base station in the access network 121. Although not shown, the core network 122 can be further interfaced to an external network in the Circuit Switched (CS) field (for example, Public Switched Telephone Network (PSTN) and Packet Switched (Packet Switched). , PS) IP network in the field (for example: Internet).

The mobile communication device 110 includes a wireless module 111 and a controller module 112. The wireless module 111 is configured to perform wireless transmission and reception functions, and the controller module 112 is used to control the operation state of the wireless module 111. Further, the wireless module 111 can be a radio frequency (RF) unit, and the controller module 112 can be a general-purpose processor or a micro-control unit (MCU) of a baseband unit. . The baseband unit may include a plurality of hardware devices to perform baseband signal processing, including analog to digital conversion (ADC)/digital to analog conversion (DAC), gain adjustment, modulation And demodulation, and encoding/decoding, and the like. The radio unit can receive the radio frequency wireless signal, and convert the radio frequency wireless signal into a baseband signal for further processing by the baseband module, or receive the baseband signal from the baseband signal module, and convert the baseband signal into a radio frequency wireless signal. For transmission. The radio frequency unit may also include a plurality of hardware devices to perform the above radio frequency conversion. For example, the radio frequency unit may include a mixer to multiply the baseband signal by one of the radio frequency carriers of the mobile communication system, wherein The radio frequency can be broadband code division multiplexing access 900 MHz, 1900 MHz, or 2100 MHz used by (Wideband Code Division Multiple Access, WCDMA) technology, or 900 that can be used for Long Term Evolution (LTE) technology/LTE-Advanced technology Megahertz, 2100 MHz, or 2.6 GHz, or depending on other wireless access technology standards. Although not shown, the mobile communication device 110 may further include other functional modules, such as a display unit for providing a human-machine interface, a keypad, and a storage unit for storing an application. Similarly, the wireless access base station in the access network 121 can also include a wireless module (not shown) and a controller module (not shown). The controller module controls the wireless module to perform wireless. Transmission and reception functions.

In an embodiment, the service network 120 can be a long term evolution network, and the access network 121 can be an Evolved Universal Terrestrial Radio Access Network including at least one evolved base station node. , E-UTRAN), the core network 122 can be an Evolved Packet Core (EPC), and the mobile communication device 110 can be one of the mobile station/user devices supporting the long term evolution technology or the long term evolution enhancement technology. It should be noted that in other embodiments, the service network 120 and the mobile communication device 110 may use other wireless access technologies that support carrier aggregation technology and multiple carrier frequencies, such as long-term evolution enhancement technology, global interoperability microwave access ( Worldwide Interoperability for Microwave Access, WiMAX) technology, etc., and the present invention is not limited thereto.

At the mobile communication device 110 side, specifically, the controller module 112 controls the wireless module 111 to perform a random access procedure with the wireless access base station in the access network 121. In particular, the controller module 112 of the present invention Used to perform the operation of the media access control layer to handle random access failures; or in other words, the method for processing random access failures of the present invention operates in the media access control layer, and is controlled by the media access control layer. Actively stop the retry of the random access program when random access fails.

It should be noted that the controller module 112 is not limited to only perform the operation of the media access control layer, and can also be used to perform other layer operations in the mobile communication protocol, including: non-access (Non-Access Stratum, The NAS layer, the radio resource control layer, and the physical (PHY) layer, etc., perform other mobile communication procedures. However, other mobile communication programs are not within the scope of the present invention, and thus will not be further described herein.

FIG. 2 is a sequence diagram of information for processing random access failure according to an embodiment of the invention. In this embodiment, the access network 121 is an evolved universal terrestrial wireless access network comprising at least one evolved base station node, and the mobile communication device 110 is one of the mobile stations using long term evolution technology or long term evolution enhancement technology. First, the mobile communication device 110 is configured to use a plurality of carrier frequencies, and initiates a random access procedure for one of the carrier frequencies (hereafter referred to as CF#1), but the random access procedure has been heavy. A predetermined number has been tried but still failed, or has been retries for a predetermined period of time but still fails (step S210). When detecting the retry failure of the random access program, the controller module 112 actively stops the retry of the random access procedure on CF#1 (step S220). In an embodiment, in order to stop the retry of the random access procedure, the controller module 112 may discard the radio resource associated with the random access procedure, wherein the radio resource is controlled by the medium access control layer. The parameters ra-PreambleIndex and ra-PRACH-MaskIndex are indicated. By actively stopping on CF#1 The retry of the random access procedure can save power consumption of the mobile communication device, or improve the resource management performance of the wireless access base station, or other effects.

Further, the controller module 112 can also selectively perform related subsequent operations to improve the processing of random access failures, for example, to make the utilization of the wireless resources of the access network 121 more efficient. Therefore, the subsequent steps are indicated by dashed boxes in the figure. Specifically, the controller module 112 can selectively activate a prohibit timer T (prohibit timer) and prohibit the retry of the random access procedure on the CF #1 during the operation of the inhibit timer T (step S230). ). Next, the controller module 112 can selectively deactivate CF #1 (step S240). It is worth noting that once CF#1 is deactivated, the timer T is forbidden to be stopped, and CF#1 must be restarted before it can be used for data transmission/reception. Then, the controller module 112 can selectively report the random access procedure for CF#1 to the access network 121 via the wireless module 111 at another carrier frequency (hereafter referred to as CF#2). The information of the failure is retried (step S250). In addition, the controller module 112 can also selectively initiate a random access procedure through the wireless module 111 on another carrier frequency having a high priority (hereinafter, the text is generally referred to as CF#3) (step S260). ). That is, the controller module 112 can respectively set a priority level for all the set carrier frequencies. When the retry failure of the random access procedure is detected, the corresponding carrier frequency (ie, CF) is used. #1) The priority level is lowered. It should be noted that although different carrier frequencies are selected in steps S250 and S260 to separately report and initiate a random access procedure, in other embodiments, the same carrier frequency may be selected to separately report and The action of initiating a random access procedure. In addition, the execution order of steps S230~S260 can be adjusted according to different consideration conditions, and the present invention Ming is not limited to this.

Later, when the timer is disabled, the controller module 112 cancels the retry inhibition of the random access procedure on CF#1 (step S270), meaning that random access is allowed on CF#1. Retry the program, or re-initiate the random access procedure. For step S270, in another embodiment, the controller module 112 can use a timeout counter to record the number of times the timer is disabled. When the timer is disabled, the controller module 112 Increase the value of the time-out progressiveizer by one, and then judge whether the value of the time-out progressiveizer exceeds a predetermined threshold. If it is not exceeded, the prohibition of CF#1 is released; otherwise, if the value of the time-out progressiveizer exceeds If the threshold is reserved, the prohibition of CF#1 will not be released. It should be noted that step S270 corresponds to step S230, that is, if the controller module does not select to perform step S230, step S270 is not performed in conjunction; in addition, if the controller module 112 selects to perform step S230 With step S240, step S270 will be omitted and not executed because the prohibition timer T has been stopped in response to the deactivation of CF#1.

Figure 3 is a sequence diagram of information for processing random access failures according to another embodiment of the present invention. Similar to FIG. 2, the access network 121 is an evolved universal terrestrial wireless access network including at least one evolved base station node, and the mobile communication device 110 is one of the mobile stations using long term evolution technology or long term evolution enhancement technology. . First, the mobile communication device 110 is configured to use a plurality of carrier frequencies in which a random access procedure is expected to be recorded in a pending list, and the mobile communication device 110 is targeted to the candidate list. One of the carrier frequencies (hereafter referred to as CF#3 generic) initiates a random access procedure, but the random access procedure has been retried A predetermined amount but still failed, or has been retries for a predetermined length of time but still failed (step S310). After the retry of the random access procedure is detected, the access network 121 first stores or updates the state of the CF#3 according to the detection result (step S320). In an embodiment, The state of CF#3 can be stored in a storage module in a wireless access base station, such as a memory, a hard disk, or the like. Then, the access network 121 transmits a message to the mobile communication device 110 (step S330). For example, the message may be a protocol data unit (Protocol) of one of the media access control layers including a deactivation command. The data unit (PDU), or may be a radio resource control (RRC) layer message including a release command or a reconfiguration command, or may be a physical layer (Physical, PHY) The signal, but the invention is not limited to this. When the controller module 112 receives the message through the wireless module 111, it stops the retry of the random access procedure on CF#3 (step S340). In an embodiment, when the retry stop of the random access procedure is performed on CF#3, CF#1 may be removed from the candidate list.

Further, the controller module 112 can selectively perform related subsequent operations according to the message to complete the process of random access failure, so the subsequent steps are indicated by dashed boxes in the figure. Specifically, the message may optionally include a status report request, such that the controller module 112 reports the status of the carrier frequency to the access network 121 via the wireless module 111 (step S350), for example, reporting the content. The status of all carrier frequencies in the candidate list may be included, or may only include the associated carrier frequency at which the random access procedure fails (ie, CF#3), and may be reported through other carrier frequencies. Based on this return, the access network 121 can be maintained for the state of the carrier frequency. Synchronized with the mobile communication device 110. Then, if the message is a protocol data unit including one of the media access control layers of the disable command, the controller module 112 may further disable CF#3 (step S360). Moreover, if the message is a message including one of the radio resource control layers of the release or reset command, the controller module 112 may further release CF#3 (step S370). Thereafter, the message may optionally include an initiation random access command, so that the controller module 112 initiates random storage on the other carrier frequency (hereinafter, the image is all referred to as CF#4) through the wireless module 111 according to the message. The program is taken (step S380). Specifically, the initiating random access command indicates the carrier frequency (ie, CF#4) of the handover of the mobile communication device.

In another embodiment, step S350 can be designed such that the controller module 112 actively and periodically reports the status of the carrier frequency to the access network 121 without waiting for the retry failure of the random access procedure. It is executed only when a message from the access network 121 is received.

4 is a flow chart of a method for processing random access failures performed by a mobile communication device according to an embodiment of the invention. In this embodiment, the method for processing random access failure is applied to one of the mobile communication devices in the multi-carrier system, and the mobile communication device is wirelessly connected to a wireless access base station. First, the mobile communication device performs a retry of a random access procedure with the radio access base station on a carrier frequency (step S410), and then when the retry of the random access procedure fails, or receives When one of the wireless base stations accesses the message, the retry of the random access procedure is stopped (step S420). In particular, before the retry step of stopping the random access procedure, the number of retries of the random access procedure has reached a predetermined number but still fails, or the retry of the random access procedure has continued for a predetermined period of time. But still failed. In this way, since the mobile communication device of the present invention fails to detect the retry of the random access procedure, it actively stops the retry of the random access procedure on the carrier frequency, thereby achieving power saving, Or improve the resource management performance of the wireless access base station, or other effects.

In other embodiments, the mobile communication device may further perform other related subsequent operations after stopping the retry of the random access procedure to complete the random access failure processing, for example, making the wireless access base station's wireless resource utilization more For efficiency, please see the following 5A, 5B, and 6A, 6B for details.

5A and 5B are flowcharts of a method for processing random access failures performed by a mobile communication device according to another embodiment of the present invention. Similar to FIG. 4, the method for processing random access failure described in this embodiment is applicable to one mobile communication device in a multi-carrier system, and the mobile communication device is wirelessly connected to a wireless access base station. First, the mobile communication device is configured to use a plurality of carrier frequencies, in particular, the carrier frequencies are sequentially arranged according to their respective priority levels, and the mobile communication device initiates for one carrier frequency having a higher priority level. Random accessing the program (step S501), and determining whether the random access procedure has failed (step S502), if not, determining whether there is another carrier frequency (step S503), and if so, returning to step S501 to have higher priority The random access procedure is initiated on another carrier frequency of the rank; conversely, if there are no other carrier frequencies, the flow ends.

In step S502, if the random access procedure fails, it is determined whether the random access procedure has retried a predetermined number (step S504), and if not, the random access procedure is retried on the original carrier frequency (step S505); On the other hand, if the random access procedure has been retried for a predetermined number, the retry of the random access procedure is stopped (step S506), and the radio resource associated with the random access procedure is revoked, wherein the radio resource is The parameters of the media access control layer, ra-PreambleIndex and ra-PRACH-MaskIndex, are indicated (step S507). The predetermined number can be set as the allowable upper limit of a retry as a threshold for limiting the number of retries. In another embodiment, the threshold condition of step S504 may be changed to determine whether the retry of the random access procedure has continued for a predetermined period of time, and if so, step S506 is performed to stop the retry of the random access procedure.

Next, the mobile communication device decides whether to perform a series of selective operations. Specifically, it is first determined whether the carrier frequency is deactivated (step S508), and if so, the carrier frequency is deactivated (step S509). Then, the mobile communication device determines whether or not to report an error to the wireless access base station (step S510), and if so, reports information about the retry failure of the random access program to the wireless access base station (step S511). After returning or not reporting, the mobile communication device determines whether to initiate a random access procedure on another carrier frequency (step S512), and if so, initiates a random access procedure for another carrier frequency having a high priority (step S513) . Thereafter, the mobile communication device further reduces the priority level corresponding to the carrier frequency (step S514), and the flow returns to step S501 to initiate a random access procedure on another carrier frequency having a higher priority level.

6A and 6B are flowcharts showing a method for processing random access failure by a mobile communication device according to still another embodiment of the present invention. First, steps S601 to S607 are similar to steps S501 to 507 in FIGS. 5A and 5B, and the retry of the random access procedure is stopped and the random access procedure is abolished. After the wireless resource is closed, the mobile communication device determines whether to perform subsequent selective operations different from the 5A and 5B maps. However, in this embodiment, it is expected that the carrier frequency of the random access procedure will be recorded in a candidate. In the list, the carrier frequency is selected from the candidate list for random access procedures. Specifically, after stopping the retry of the random access procedure, the mobile communication device first determines whether a prohibition timer corresponding to the carrier frequency needs to be activated (step S608), and if so, starts the prohibit timer and sets the carrier The frequency is removed from the candidate list (step S609). Then, the mobile communication device determines whether the carrier frequency is deactivated (step S610), and if so, deactivates the carrier frequency (step S611). Further, the mobile communication device determines whether or not to report an error to the wireless access base station (step S612), and if so, reports information about the retry failure of the random access program to the wireless access base station (step S613). After returning or not reporting, the mobile communication device determines whether to initiate a random access procedure on another carrier frequency (step S614), and if so, initiates a random access procedure for another carrier frequency having a high priority in the candidate list ( Step S615).

Thereafter, the mobile communication device determines whether the prohibition timer has been started (step S616), and if not, lowers the priority level corresponding to the carrier frequency (step S617); otherwise, if the prohibition timer has been activated, then determines Whether the timer is disabled or not (step S618), and if so, the carrier frequency corresponding to the prohibit timer is added back to the candidate list (step S619), and then returns to step S601 for another carrier frequency having a high priority. The random access procedure is initiated; in step S618, if the timer is not disabled, the process returns to step S601. In another embodiment, the mobile communication device may first use a time-out accumulator to record the number of times the timer is disabled, when the prohibition is counted. When the timer expires, the mobile communication device increases the value of the time-out progressive device by one, and then determines whether the value of the time-out progressiveizer exceeds a predetermined threshold. If not, the step S619 is executed to correspond to the prohibition timer. The carrier frequency is added back to the candidate list; otherwise, if the value of the time-out progressive device exceeds a predetermined threshold, the carrier frequency corresponding to the inhibit timer is not added back to the candidate list.

Figure 7 is a flow chart of a method for processing random access failures performed by a radio access base station according to an embodiment of the invention. In this embodiment, the method for processing random access failure is applicable to one of the multi-carrier systems, and a mobile communication device is wirelessly connected to the radio access base station. First, the RRC base station performs a retry of a random access procedure with the mobile communication device on a carrier frequency (step S710), and then transmits a message when it detects that the retry attempt of the random access procedure fails. The mobile communication device is caused to cause the mobile communication device to stop the retry of the random access procedure (step S720). In particular, the WLAN base station may detect that the number of retries of the random access procedure has reached a predetermined number but still fails, or the retry of the random access procedure has continued for a predetermined period of time but still fails. Step S720 is performed to transmit the message. In this way, since the wireless access base station of the present invention fails to detect the retry of the random access procedure, the mobile communication base station transmits a message to stop the mobile communication device from performing the retry of the random access procedure on the carrier frequency, thereby The power communication performance of the mobile communication device is saved, or the resource management performance of the wireless access base station is enhanced, or other effects are achieved.

In other embodiments, the RRC base station may further perform other related subsequent operations after transmitting the message to complete the process of random access failure, for example, making the radio resource utilization of the WTRU more efficient and detailed. See Figures 8A and 8B below for instructions.

8A and 8B are flowcharts showing a method for processing random access failure by a radio access base station according to another embodiment of the present invention. Similar to FIG. 7, the method for processing random access failure described in this embodiment is applicable to one radio access base station in a multi-carrier system, and a mobile communication device is wirelessly connected to the radio access base station. First, the radio access base station detects that the random access procedure retry between the mobile communication device fails (step S801), and the radio access base station stores the state of the carrier frequency where the random access procedure retry fails. Entering a storage module or updating the state of the carrier frequency stored in the storage module (step S802). Then, the WLAN base station prepares a message and includes a stop command in the message (step S803), wherein the stop command is used to request the mobile communication device to stop the retry of the random access procedure, for example, the message The information may be a protocol data unit of a media access control layer, a message of a radio resource control layer, or a signal of a physical layer, and the stop instruction may be a deactivation instruction of one of the media access control layers, or a radio resource control layer. One releases or resets the instruction.

Next, the radio access base station determines whether to perform a series of selective operations. Specifically, it is first determined whether a mobile communication device return is required (step S804), and if so, a return command is included in the message for causing the mobile communication device to report a status regarding the carrier frequency (step S805). Then, the radio access base station determines whether it is required to request the mobile communication device to disable the carrier frequency (step S806), and if so, includes a disable command in the message for deactivating the mobile communication device to generate a random access procedure. The failed carrier frequency is tried (step S807). In addition, the wireless access base station determines whether it is required to request the mobile communication device to release the carrier frequency (step S808), and if so, includes a release command in the message for enabling the mobile communication device The carrier frequency at which the random access procedure retry fails occurs is released (step S809). Thereafter, the WLAN base station determines whether it is required to request the mobile communication device to initiate a random access procedure on another carrier frequency (step S810), and if so, includes a request for initiating a random access command for enabling the mobile communication The device initiates a random access procedure on another carrier frequency (step S811). Finally, the message is transmitted to the mobile communication device (step S812).

The present invention has been described above with reference to various embodiments, which are intended to be illustrative only and not to limit the scope of the invention, and those skilled in the art can make a few changes without departing from the spirit and scope of the invention. With retouching. For example, the method for processing random access failure proposed by the present invention can also be applied to other advanced development technologies supporting long-term evolution/long-term evolution enhancement, or any mobile communication device and wireless access supporting carrier aggregation technology and multiple carrier frequencies. Base station. The above-described embodiments are not intended to limit the scope of the invention, and the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Multi-carrier system

110‧‧‧Mobile communication device

111‧‧‧Wireless Module

112‧‧‧Controller module

120‧‧‧Service Network

121‧‧‧Access network

122‧‧‧core network

1 is a schematic diagram of a multiple carrier system according to an embodiment of the invention.

FIG. 2 is a sequence diagram of information for processing random access failure according to an embodiment of the invention.

Figure 3 is a sequence diagram of information for processing random access failures according to another embodiment of the present invention.

4 is a flow chart of a method for processing random access failures performed by a mobile communication device according to an embodiment of the invention.

5A and 5B are flowcharts of a method for processing random access failures performed by a mobile communication device according to another embodiment of the present invention.

6A and 6B are flowcharts showing a method for processing random access failure by a mobile communication device according to still another embodiment of the present invention.

Figure 7 is a flow chart of a method for processing random access failures performed by a radio access base station according to an embodiment of the invention.

8A and 8B are flowcharts showing a method for processing random access failure by a radio access base station according to another embodiment of the present invention.

100‧‧‧Multi-carrier system

110‧‧‧Mobile communication device

111‧‧‧Wireless Module

112‧‧‧Controller module

120‧‧‧Service Network

121‧‧‧Access network

122‧‧‧core network

Claims (34)

A mobile communication device suitable for processing random access failures in a multi-carrier system, comprising: a wireless module for performing wireless transmission and reception with a wireless access base station; and a controller The module is configured to perform a media access control (Media Access Control) layer operation, comprising: performing a random access procedure with the wireless access base station on a carrier frequency through the wireless module Retrying, and retrying the random access procedure when the retry of the random access procedure fails or when receiving a message from the wireless access base station through the wireless module. The mobile communication device of claim 1, wherein the random access procedure has reached a predetermined number of retries but failed, or the random access, before the retry of the random access procedure is stopped. The retry of the program has continued for a predetermined period of time but still failed. The mobile communication device of claim 1, wherein the controller module further initiates another random access procedure on another carrier frequency through the wireless module according to the message. The mobile communication device according to claim 1, wherein the controller module discards the radio resource associated with the random access program in response to stopping the retry of the random access procedure, and the wireless device The resource is indicated by the parameters ra-PreambleIndex and ra-PRACH-MaskIndex of the media access control layer. The mobile communication device according to claim 1, wherein the medium access control layer belongs to Long Term Evolution (Long Term) Evolution, LTE) technology or part of the communication protocol for LTE-Advanced technology. A method for handling random access failure, according to a medium access control layer in a mobile communication protocol, and applicable to a mobile communication device in a multi-carrier system, comprising: performing on a carrier frequency with a wireless access base station Retrying a random access procedure; and stopping the retry of the random access procedure when the retry of the random access procedure fails or upon receiving a message from the wireless access base station. The method for processing random access failure according to claim 6, wherein the random access procedure has reached a predetermined number of retries but fails before stopping the retry step of the random access procedure. Or the retry of the random access procedure described above has continued for a predetermined period of time but still fails. The method for processing random access failure as described in claim 6 further includes: initiating another random access procedure on another carrier frequency according to the foregoing message. The method for processing random access failure according to claim 6 of the patent application scope, further comprising: abolishing the radio resource related to the random access procedure in response to stopping the retry of the random access procedure, wherein the radio resource is The parameters of the media access control layer are indicated by ra-PreambleIndex and ra-PRACH-MaskIndex. The method for processing random access failure as described in claim 6 wherein the medium access control layer is part of a communication protocol of a long term evolution technology or a long term evolution enhanced technology. A wireless access base station, suitable for processing random access failures in a multi-carrier system, comprising: a wireless module for performing wireless transmission and reception with a mobile communication device; and a controller module for Performing a retry of a random access procedure with the mobile communication device on a carrier frequency through the wireless module, and transmitting the wireless module after detecting a retry failure of the random access program a message to the mobile communication device to cause the mobile communication device to stop the retry of the random access procedure. The radio access base station according to claim 11, wherein the message is a protocol data unit (PDU) of a media access control layer, and a radio resource control (RRC) layer. A message, or a signal from a physical layer (Physical, PHY). The wireless access base station of claim 12, wherein the information of the RRC layer further comprises a release/reconfiguration command for causing the mobile communication device to release the carrier frequency. The wireless access base station of claim 11, wherein the message is used to cause the mobile communication device to initiate another random access procedure on another carrier frequency. The wireless access base station according to claim 11 of the patent application, The above controller modules operate in accordance with the long-term evolution technology or the long-term evolution enhancement technology communication protocol. A method for processing random access failure, suitable for a radio access base station in a multi-carrier system, comprising: retrying a random access procedure with a mobile communication device on a carrier frequency; and detecting When it is determined that the retry of the random access procedure fails, a message is transmitted to the mobile communication device to cause the mobile communication device to stop the retry of the random access procedure. The method for processing random access failure as described in claim 16 wherein the message is a protocol data unit of a media access control layer, a message of a radio resource control layer, or a signal of a physical layer. The method for processing a random access failure as described in claim 17, wherein the information of the RRC layer further includes a release or reset command for causing the mobile communication device to release the carrier frequency. The method for processing random access failure as described in claim 16 wherein the message is further used to cause the mobile communication device to initiate another random access procedure on another carrier frequency. The method for processing random access failure as described in claim 16 wherein the WTRU operates according to a long-term evolution technology or a long-term evolution enhanced technology communication protocol. A multiple carrier system adapted to handle random access failures, comprising: a mobile communication device for performing operations of a media access control layer, comprising: performing a random access procedure retry on a carrier frequency, and Retrying the random access procedure when the retry of the random access procedure fails, or when receiving a message; and detecting a random access procedure by the wireless access base station When the test fails, the above message is transmitted to the above mobile communication device. The multi-carrier system of claim 21, wherein before the mobile communication device stops the retry of the random access procedure, the number of retries of the random access procedure has reached a predetermined number but still fails, or The retry of the above random access procedure has continued for a predetermined period of time but still failed. The multi-carrier system according to claim 21, wherein the mobile communication device further abolishes the radio resource associated with the random access procedure in response to stopping the retry of the random access procedure, and the radio resource is the media The parameters of the access control layer are indicated by ra-PreambleIndex and ra-PRACH-MaskIndex. The multiple carrier system of claim 21, wherein the message is a protocol data unit of a media access control layer, a message of a radio resource control layer, or a signal of a physical layer. The multi-carrier system of claim 24, wherein the information of the RRC layer further comprises a release or reset command for causing the mobile communication device to release the carrier frequency. The multi-carrier system of claim 21, wherein the mobile communication device further initiates another random access procedure on another carrier frequency according to the message. The multi-carrier system according to claim 21, wherein the medium access control layer belongs to long-term evolution technology or long-term evolution Part of the communication protocol for the technology, and the WTRU is operating in accordance with a long-term evolution technology or a long-term evolution enhanced technology communication protocol. A method for handling random access failure is applicable to a multi-carrier system including a mobile communication device and a wireless access base station, wherein the mobile communication device is configured to perform operations of a media access control layer, including: The communication device performs a retry of a random access procedure with the wireless access base station on a carrier frequency; and the wireless access base station transmits a message when the retry of the random access procedure is detected to be failed And the mobile communication device stops the retry of the random access procedure when the retry of the random access procedure fails or when the message is received by the mobile communication device. The method for processing random access failure as described in claim 28, wherein the random access procedure has reached a predetermined number of retries before the mobile communication device stops the retry of the random access procedure. Still failing, or the retry of the above random access procedure has continued for a predetermined period of time but still failed. The method for processing a random access failure as described in claim 28, further comprising: abolishing the radio resource associated with the random access procedure by the mobile communication device in response to refusing the retry of the random access procedure, wherein The radio resource is indicated by parameters ra-PreambleIndex and ra-PRACH-MaskIndex of the medium access control layer. The method for processing random access failure as described in claim 28, wherein the message is a protocol data sheet of a media access control layer A message from a radio resource control layer or a physical layer. The method for processing random access failure according to claim 31, wherein the RRC message further includes a release or reset command for causing the mobile communication device to release the carrier frequency according to the message. . The method for processing random access failure as described in claim 28, further comprising: initiating another random access procedure on another carrier frequency by the mobile communication device according to the message. The method for processing random access failure according to claim 28, wherein the medium access control layer belongs to a part of a long-term evolution technology or a long-term evolution enhanced technology communication protocol, and the wireless access base station follows a long-term Operates as a communication protocol for Evolving Technology or Long Term Evolution Enhanced Technology.