WO2011018042A1

WO2011018042A1 - Method and device for detecting radio link failure

Info

Publication number: WO2011018042A1
Application number: PCT/CN2010/075943
Authority: WO
Inventors: 梁靖; 谌丽; 刘佳敏
Original assignee: 大唐移动通信设备有限公司
Priority date: 2009-08-13
Filing date: 2010-08-12
Publication date: 2011-02-17
Also published as: CN101998661B; CN101998661A

Abstract

A method for detecting radio link failure is disclosed in the embodiments of the present invention. The method includes the following steps: the media access control (MAC) layer of a user equipment (UE), based on the carrier or the carrier set of the UE, reports a random access problem indication to the radio resource control (RRC) layer of said UE; said RRC layer determines whether a random access problem of the MAC layer occurs to the carrier of said UE according to the reporting form and the reporting content of said random access problem indication; when said RRC layer finds the random access problem of the MAC layer occurs to all the carriers of said UE, said RRC layer detects a radio link failure occurs to said UE. The technical solution of the embodiments of the present invention has the advantage of solving the problem of how to detect radio link failure for carrier aggregation (CA), because the detection of radio link failure is performed for a UE, but not for a single carrier.

Description

Method and apparatus for determining wireless link failure This application claims to be submitted to the Chinese Patent Office on August 13, 2009, with the application number of 200910091197.3, and the invention titled "a method and device for determining the failure of a wireless link" Priority of the application, the entire contents of which are incorporated herein by reference. Technical field

The present invention relates to the field of mobile communication technologies, and in particular, to a method and apparatus for determining a failure of a wireless link. Background technique

The peak rate of the LTE-A (Long Term Evolution Advanced) system is significantly higher than that of the LTE (Long Term Evolution) system, requiring downlink lGbps and uplink 500 Mbps. At the same time, the LTE-A system requires good compatibility with the LTE system, and the maximum bandwidth of the LTE system is 20 MHz. The LTE-A system introduces CA (Carrier Aggregation) technology based on the need to increase the peak rate, be compatible with the LTE system, and make full use of the frequency resources. As shown in FIG. 1 , it is a schematic diagram of a carrier form of an LTE system; as shown in FIG. 2 , it is a schematic diagram of a carrier aggregation form of an LTE-A system.

Multiple component carriers (uplink or downlink) in the CA technology are aggregated together and serve the UE (User Equipment), instead of the mode of only one carrier in the LTE system and the previous wireless communication system. A base station (such as an eNB) uniformly manages and schedules multiple sets of component carriers, and conversion between different component carriers in one base station is only a resource allocation problem. The component carriers may be continuous or non-contiguous. For compatibility with the LTE system, the maximum bandwidth of each component carrier is 20 MHz, and the bandwidth between the component carriers may be the same or different. The types of component carriers in the CA technology include a backwards compatible carrier, a non-backwards compatible carrier, and an extension carrier. The backward compatible carrier is compatible with the LTE system. Can exist independently or as part of carrier aggregation, in FDD In a (Frequency Division Duplex) system, backward compatible carriers always appear in pairs, that is, DL (downlink) carriers and UL (uplink) carriers are always paired; Non-backward compatible carriers are not compatible with earlier versions of LTE systems and can exist independently or as part of carrier aggregation; extended carriers cannot exist independently and are only part of carrier aggregation.

When the UE is in the carrier aggregation working state, one or more specific carriers in the aggregated carrier may be defined as the primary carrier of the UE. The primary carrier of the UE may be configured by the network, for example, the carrier of the primary serving cell of the UE is defined as the primary carrier of the UE, and the UE may only listen to system information on the primary carrier, perform cell handover based on the primary carrier, or only monitor the PDCCH of the primary carrier. (Physical Downlink Control Channel). In general, there is only one primary carrier of the UE. In the carrier aggregation transmission process, the primary carrier of the UE may remain unchanged or may be reconfigured by the network.

In the LTE system, the UE determines whether a radio link failure is detected based on the following conditions: The T310 timer expires; and the random access problem indication reported by the MAC (Media Access Control) layer is received. When the T300, T301, T304, and T311 timers are invalid, an indication of the maximum number of retransmissions reported by the RLC (Radio Link Control) layer is received.

The T310 is associated with the physical layer synchronization "in-sync" and the out-of-sync "out-of-sync" indication. The specific rules are: when the UE receives N310 "out-of-sync" indications continuously sent from the bottom layer and When the T300, T301, T304, and T311 timers are invalid, the timer T310 is started. When the T310 continuously receives N311 "in-sync" indications from the bottom layer, the UE stops the timer T310.

In addition, Τ300 is used for the RRC (Radio Resource Control) connection establishment process, T301 and T311 are used for the RRC connection re-establishment process, and T304 is used for the handover process. When the RRC connection establishment process, the RRC connection re-establishment process, or the handover process occurs, the RRC layer ignores the random access problem indication reported by the MAC layer, and does not determine that the UE has failed the radio link.

In the process of implementing the present invention, the inventors found that the prior art has at least the following problems: The radio link failure decision method in the LTE system is performed on a single carrier, that is, for one working carrier. When applied to the carrier aggregation mechanism, when the quality of one carrier radio link is deteriorated, all other carriers cannot work. Case. Summary of the invention

Embodiments of the present invention provide a method and apparatus for determining a radio link failure, which are used to solve the problem of how to perform a radio link failure decision under carrier aggregation.

The embodiment of the invention provides a method for determining a radio link failure, which includes the following steps:

The MAC layer of the user equipment reports a random access problem indication to the RRC layer of the user equipment based on the carrier or carrier set of the user equipment;

Determining, by the RRC layer, whether the carrier of the user equipment has a random access problem of the MAC layer according to the reporting form and the content of the reporting of the random access problem; and determining, by the RRC layer, all carriers of the user equipment The random access problem of the MAC layer occurs, and the RRC layer determines that the user equipment has failed the radio link.

An embodiment of the present invention provides a device for determining a radio link failure, including a MAC layer function module and an RRC layer function module;

The MAC layer function module is configured to report, according to a carrier or a carrier set of the user equipment, a random access problem indication to the RRC layer function module of the user equipment, where the RRC layer function module is configured to use, according to the MAC Determining, by the layer function module, the reporting form of the random access problem indication and the content of the report, determining whether the carrier of the user equipment has a random access problem at the MAC layer; when all carriers of the user equipment have a MAC layer The random access problem determines that the user equipment has failed the radio link.

The technical solution of the embodiment of the present invention has the following advantages, because the radio link failure decision is performed for the UE instead of the single carrier, and the problem of how to perform the radio link failure judgment under carrier aggregation is solved. DRAWINGS

1 is a schematic diagram of a carrier form of an LTE system in the prior art;

2 is a schematic diagram of a carrier aggregation format of an LTE-A system in the prior art; FIG. 3 is a flowchart of a method for determining a radio link failure according to Embodiment 1 of the present invention; FIG. 5 is a flowchart of a method for determining a radio link failure according to Embodiment 3 of the present invention; FIG. 6 is a flowchart of a method for determining a radio link failure according to Embodiment 4 of the present invention; FIG. 7 is a flowchart of a method for determining a radio link failure according to Embodiment 5 of the present invention; FIG. 8 is a flowchart of a method for determining a radio link failure according to Embodiment 6 of the present invention; A schematic diagram of a device structure for determining a failure of a wireless link in a sixth example.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 3, a flowchart of a method for determining a radio link failure in the first embodiment of the present invention includes the following steps:

Step 301: The MAC layer of the user equipment reports a random access problem indication to the RRC layer of the user equipment based on the carrier or the carrier set of the user equipment.

Step 302: The RRC layer determines, according to the reporting form of the random access problem and the content of the report, whether the carrier of the user equipment has a random access problem at the MAC layer.

Specifically, when the MAC layer reports the random access problem according to the single carrier, the RRC layer determines whether the carrier of the user equipment has a random access problem at the MAC layer, and specifically includes: the RRC layer acquiring and the single carrier are in the same carrier set. All member carriers, and It is determined that all component carriers in the carrier set have a random access problem at the MAC layer.

When the MAC layer reports the random access problem indication based on the carrier set, the RRC layer determines whether the carrier of the user equipment has a random access problem at the MAC layer, and specifically includes: the RRC layer determines that all component carriers in the carrier set have a MAC layer. Random access problem.

When the MAC layer reports the random access problem indication based on the single carrier, the RRC layer determines whether the carrier of the user equipment has a random access problem at the MAC layer, and specifically includes:

The RRC layer determines whether the single carrier is the primary carrier. If all the primary carriers of the UE have a random access problem, the RRC layer determines that all the carriers of the UE have a random access problem at the MAC layer.

After the RRC layer determines whether the carrier of the user equipment has a random access problem at the MAC layer, if the RRC layer determines that the radio link of the carrier set of the user equipment fails, the information of the radio link failure of the carrier set is passed through a dedicated message. The network side device is notified to enable the network side device to deactivate or reconfigure the carrier set.

The component carriers in the carrier set have similar channel characteristics, and the channel characteristics include consecutive carriers or have the same TA (Timing Advance).

Step 303: When the RRC layer determines that the MAC layer random access problem occurs on all carriers of the user equipment, the RRC layer determines that the user equipment has failed the radio link.

It should be noted that the method in the embodiment of the present invention can adjust the sequence of each step according to actual needs.

The technical solution of the embodiment of the present invention has the following advantages, because the radio link failure decision is performed for the UE instead of the single carrier, and the problem of how to perform the wireless link failure decision under carrier aggregation is solved.

When the UE is configured to perform continuous carrier aggregation and the MAC layer reports the random access problem in a single carrier manner, as shown in FIG. 4, it is a flowchart of a method for determining a radio link failure according to the second embodiment of the present invention, which includes the following steps. :

Step 401: The UE selects N random accesses on the carrier 1, but the N random accesses fail. N is the maximum number of random access allowed, the UE is in the carrier aggregation transmission state, and the aggregated carrier is three consecutive carriers, which are called carrier 1, carrier 2, and carrier 3. The above three carriers have similar channel characteristics and have the same TA as the same carrier set. When the T300, T301, T304, and T311 timers are invalid, if the UE needs to initiate random access due to uplink out-of-synchronization, the UE may elect to initiate a random access procedure on Carrier 1, Carrier 2, or Carrier 3.

Step 402: The MAC layer reports a random access problem to the carrier 1 of the RRC layer. Step 403: The RRC layer finds that carrier 1, carrier 2, and carrier 3 are consecutive through the existing configuration information, that is, the three carriers are three carriers in the same carrier set, step 404, and the RRC layer determines that the carrier set has occurred. The random access problem, and the UE is determined to have failed the radio link.

Specifically, since carrier 1, carrier 2, and carrier 3 are all carriers currently aggregated by the UE, the RRC layer determines that the UE has failed the radio link.

Step 405: The UE triggers an RRC connection reestablishment process.

When the UE is configured as a continuous carrier aggregation, and the MAC layer reports the random access problem in the form of a carrier set, as shown in FIG. 5, it is a flowchart of a method for determining a radio link failure according to the third embodiment of the present invention, which includes the following steps. :

Step 501: The UE selects N random accesses on the carrier 1, but the N random access fails.

N is the maximum number of random access allowed, the UE is in the carrier aggregation transmission state, and the aggregated carrier is three consecutive carriers, which are called carrier 1, carrier 2, and carrier 3. The above three carriers have similar channel characteristics and have the same TA as the same carrier set. When the T300, T301, T304, and T311 timers are invalid, if the UE needs to initiate random access due to uplink out-of-synchronization, the UE may select carrier 1, carrier 2 or carrier. 3 initiates a random access procedure.

In addition, the UE may also choose to initiate random access on the carrier 1, the carrier 2, and the carrier 3. The total number of random accesses is M times, and M is the maximum number of random accesses allowed, but the M times of random access fails.

Step 502: The MAC layer reports to the RRC layer that the carrier set where the carrier 1 is located has a random access problem.

Step 503: The RRC layer determines that a random access problem occurs in the carrier set, and determines that the radio link fails in the UE.

Step 504: The UE triggers an RRC connection reestablishment process.

The technical solution of the embodiment of the present invention has the following advantages, because the radio link failure decision is performed for the UE instead of the single carrier, and the problem of how to perform the radio link failure decision under carrier aggregation is determined.

When the UE is configured as a non-contiguous carrier aggregation, and the MAC layer reports the random access problem in a single carrier manner, as shown in FIG. 6 , it is a flowchart of a method for determining a radio link failure in the fourth embodiment of the present invention, including the following. Steps:

Step 601: The UE selects N random accesses on the carrier 1, but the N random access fails.

N is the maximum number of random accesses allowed, and the UE is in a carrier aggregation transmission state, and aggregates carrier 1, carrier 2, carrier 3, and carrier 4, where carrier 1, carrier 2, and carrier 3 are continuous carriers, and carrier 4 It is a carrier that is not continuous with the above three consecutive carriers. The channel characteristics of carrier 1, carrier 2 and carrier 3 are similar, with the same TA as the same carrier set, and carrier 4 alone as the other carrier set. When the T300, T301, T304, and T311 timers are invalid, if the UE needs to initiate random access due to uplink out-of-synchronization, the UE may elect to initiate a random access procedure on Carrier 1, Carrier 2, or Carrier 3. Step 602: The MAC layer reports that the carrier 1 has a random access problem to the RRC layer. Step 603: The RRC layer finds that carrier 1, carrier 2, and carrier 3 are consecutive through the existing configuration information, that is, the three carriers are three carriers in the same carrier set.

Step 604: The RRC layer determines that the carrier set has a random access problem, and the RRC layer notifies the base station of the case that the carrier set has a random access problem, but does not determine that the UE has failed the radio link.

Specifically, since the current UE also aggregates the carrier 4, and the carrier 4 does not have a random access problem, the RRC layer does not determine that the UE has failed the radio link. The RRC layer may also notify the base station of the carrier set in which the carrier set of carrier 1, carrier 2 and carrier 3 fails, through dedicated signaling, so that the base station performs subsequent operations, such as deactivation or reconfiguration, on the set of carriers.

Step 605: The MAC layer initiates random access on the carrier 4. If the random access succeeds, step 606 is performed. If the random access fails, step 607 is performed.

Step 606: The UE sends and receives data on the carrier 4.

It should be noted that after performing step 606, the process can be ended.

Step 607: The MAC layer reports a random access problem to the carrier 4 to the RRC.

Step 608: The RRC layer determines that a random access problem occurs in the carrier set where the carrier 4 is located, and determines that the UE fails to generate a radio link.

Specifically, if the UE also fails N times of random access on the carrier 4, the MAC layer reports the random access problem to the carrier 4 to the RRC layer, and the RRC layer determines that the carrier set of the carrier 4 is randomly generated according to the same method. The access problem, because the carrier access problem occurs on all the carriers aggregated by the UE at this time, the RRC layer of the UE may determine that the radio link failure occurs in the UE.

Step 609: The UE triggers an RRC connection reestablishment process.

The technical solution of the embodiment of the present invention has the following advantages, because the radio link failure decision is performed for the UE instead of the single carrier, and the problem of how to perform the radio link failure judgment under carrier aggregation is solved. When the UE is configured as a non-contiguous carrier aggregation, and the MAC layer reports the random access problem in the form of a carrier set, as shown in FIG. 7 , it is a flowchart of a method for determining a radio link failure according to Embodiment 5 of the present invention, including the following. step:

Step 701: The UE selects N random accesses on the carrier 1, but the N random access fails.

N is the maximum number of random accesses allowed, and the UE is in a carrier aggregation transmission state, and aggregates carrier 1, carrier 2, carrier 3, and carrier 4, where carrier 1, carrier 2, and carrier 3 are continuous carriers, and carrier 4 It is a carrier that is not continuous with the above three consecutive carriers. The carrier characteristics of carrier 1, carrier 2 and carrier 3 are similar, with the same TA as the same carrier set, and carrier 4 alone as the other carrier set. When the T300, T301, T304, and T311 timers are invalid, if the UE needs to initiate random access due to uplink out-of-synchronization, the UE may choose to initiate a random access procedure on carrier 1, carrier 2 or carrier 3.

Step 702: The MAC layer reports to the RRC layer that the carrier set where the carrier 1 is located has a random access problem.

Step 703: The RRC layer determines that the carrier set has a random access problem, and the RRC layer notifies the base station of the case that the carrier set has a random access problem, but does not determine that the UE has failed the radio link.

Step 704: The MAC layer initiates random access on the carrier 4. If the random access succeeds, step 705 is performed. If the random access fails, step 706 is performed.

Step 705: The UE sends and receives data on the carrier 4.

It should be noted that after executing step 705, the process can be ended.

Step 706: The MAC layer reports a random access problem to the carrier 4 to the RRC.

Step 707: The RRC layer determines that a random access problem occurs in the carrier set where the carrier 4 is located. And the UE is determined to have a radio link failure.

Step 708: The UE triggers an RRC connection reestablishment process.

When the network side configures a primary carrier for the UE, and the MAC layer reports the random access problem in a single carrier manner, as shown in FIG. 8 , it is a flowchart of a method for determining a wireless link failure according to Embodiment 6 of the present invention, including The following steps:

Step 801: The UE selects N random accesses on the carrier 1, but the N random access fails.

N is the maximum number of random access allowed, the UE is in the carrier aggregation transmission state, and the aggregated carriers are called carrier 1, carrier 2, and carrier 3. Among them, carrier 1 is the only primary carrier of the UE. When the T300, T301, T304, and T311 timers are invalid, if the UE needs to initiate random access due to uplink out-of-synchronization, the UE may choose to initiate a random access procedure on the carrier 1.

Step 802: The MAC layer reports a random access problem to the carrier 1 of the RRC layer. Step 803: The RRC layer determines that the carrier 1 is the only primary carrier of the UE, and all the primary carriers of the UE have a random access problem.

Step 804: The RRC layer determines that a random access problem of the MAC layer occurs on all carriers of the UE, and determines that the radio link fails in the UE.

Specifically, since carrier 1 is the only primary carrier of the UE, the RRC layer determines that the radio link has failed. Step 805: The UE triggers an RRC connection reestablishment process.

As shown in FIG. 9, a schematic structural diagram of a device for determining a radio link failure according to Embodiment 6 of the present invention includes a MAC layer function module 910 and an RRC layer function module 920, where

The MAC layer function module 910 is configured to report a random access problem indication to the RRC layer function module 920 of the user equipment based on the carrier or carrier set of the user equipment.

The RRC layer function module 920 is configured to determine, according to the reporting form and the reported content of the random access problem reported by the MAC layer function module 910, whether the carrier of the user equipment has a random access problem at the MAC layer; A random access problem of the MAC layer occurs on all carriers of the user equipment, and the user equipment is determined to have failed the radio link.

When the MAC layer function module 910 is configured to report a random access problem according to the single carrier, the RRC layer function module 920 is specifically configured to acquire all component carriers in the same carrier set as the single carrier, and determine the carrier set. The random access problem of the MAC layer occurs in all component carriers.

When the MAC layer function module 910 is configured to report a random access problem according to the single carrier, the RRC layer function module 920 is specifically configured to determine whether the single carrier is the primary carrier, and if all the primary carriers of the UE have a random access problem, It is judged that the random access problem of the MAC layer occurs on all carriers of the UE.

When the MAC layer function module 910 reports the random access problem indication based on the carrier set, the RRC layer function module 920 is specifically configured to determine that the MAC layer random access problem occurs on all component carriers in the carrier set.

The RRC layer function module 920 is further configured to: determine that a radio link failure occurs in the carrier set of the user equipment, and pass the information that the carrier set fails to generate a radio link. The dedicated signaling notifies the network side device, so that the network side device deactivates or reconfigures the carrier set.

The component carriers in the carrier set have similar channel characteristics, and the channel characteristics include consecutive carriers or have the same TA.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A terminal device (which may be a cell phone, a personal computer, a server, or a network device, etc.) performs the methods described in various embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. The scope of protection of the invention should be considered.

Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment. The modules of the above embodiments may be integrated into one body or may be deployed separately, may be combined into one module, or may be further split into multiple sub-modules.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Rights request

A method for determining a radio link failure, comprising the steps of: the media access control MAC layer of the user equipment is reported to the RRC layer of the radio resource control of the user equipment based on a carrier or a carrier set of the user equipment a random access problem indication; the RRC layer determines, according to the reporting form and the reported content that the random access problem indicates, whether the carrier of the user equipment has a random access problem at the MAC layer;

When the RRC layer determines that the MAC layer random access problem occurs on all the carriers of the user equipment, the RRC layer determines that the user equipment has failed the radio link.

2. The method according to claim 1, wherein, when the MAC layer indicates the random access problem indication according to the single carrier, the RRC layer acquires all component carriers in the same carrier set as the single carrier. And determining that the MAC layer random access problem occurs on all component carriers in the carrier set.

The method according to claim 1, wherein, when the MAC layer reports the random access problem indication based on the carrier set, the RRC layer determines that all component carriers in the carrier set have a MAC layer Random access problem.

The method according to claim 1, wherein, after the RRC layer determines that the carrier of the user equipment has a random access problem at the MAC layer, the RRC layer further includes:

Determining, by the RRC layer, that the carrier set of the user equipment fails the radio link, and notifying the network side device of the information that the radio link failure occurs in the carrier set by using the dedicated signaling, where the network side device performs the carrier set Deactivate or reconfigure the operation.

The method according to any one of claims 2 to 4, wherein The component carriers in the set of carriers have similar channel characteristics, including the continuous carriers or having the same timing advance TA.

The method of claim 1, wherein the RRC layer determines whether the single carrier is a primary carrier, if the MAC layer is based on a single carrier reporting a random access problem indication, if the user equipment UE is all When the primary carrier has a random access problem, the RRC layer determines that all the carriers of the UE have a random access problem at the MAC layer.

7. A device for determining a failure of a radio link, comprising a MAC layer function module and an RRC layer function module, wherein:

8. Apparatus according to claim 7 wherein:

The RRC layer function module is specifically configured to: when the MAC layer function module reports a random access problem indication based on a single carrier, acquire all component carriers in the same carrier set as the single carrier, and determine the carrier A random access problem at the MAC layer occurs in all component carriers in the set.

9. Apparatus according to claim 7 wherein: The RRC layer function module is specifically configured to determine, when the MAC layer function module reports a random access problem based on a single carrier, whether the single carrier is a primary carrier, and if all primary carriers of the UE have random access The problem is that the random access problem of the MAC layer occurs on all carriers of the UE.

10. Apparatus according to claim 7 wherein:

The RRC layer function module is specifically configured to: when the MAC layer function module reports a random access problem indication based on the carrier set, determine that a random access problem of the MAC layer occurs in all component carriers in the carrier set.

11. Apparatus according to claim 7 wherein:

The RRC layer function module is further configured to determine that a radio link failure occurs in the carrier set of the user equipment, and notify the network side device of the information that the radio link failure occurs in the carrier set by using dedicated signaling, so that the network side The device deactivates or reconfigures the set of carriers.

The apparatus according to any one of claims 8 to 11, characterized in that the component carriers in the set of carriers have similar channel characteristics, the channel characteristics comprising consecutive carriers or having the same TA.