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Method for detecting radio link failure

A wireless link failure and wireless link control technology, applied in the field of communication, can solve problems such as wireless link failure, inability to accurately detect wireless links, retransmission failures, etc., to achieve accurate detection and accurate detection of wireless links failure, reducing the effect of radio link failure handling

Inactive Publication Date: 2011-06-22
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, other CCs may still be able to work normally at this time, and the UE does not need to handle the failure of the radio link;
[0010] Case 2: Although a certain RLC PDU and its retransmission packets are scheduled to be transmitted on different CCs, due to accidental reasons, the RLC PDU retransmission packets fail to be retransmitted on each different CC and reach the system setting RLC maximum number of retransmissions, thus triggering unnecessary wireless link failure processing
[0011] It can be seen from the above that the UE supporting CA cannot accurately detect whether the wireless link fails under the multi-carrier condition, and may cause unnecessary RRC reconstruction or enter the RRC_IDLE state due to false detection

Method used

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  • Method for detecting radio link failure

Examples

Experimental program
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Embodiment 1

[0054] In this embodiment, the RLC detects the radio link failure according to the priority of the logical channel. The specific process is as follows: Figure 4 Shown:

[0055] Step 101, the number of RLC PDU retransmissions in the RLC entity in the acknowledged mode reaches the maximum number of retransmissions set by the system;

[0056] Step 102, the RLC layer judges whether the priority of the logical channel corresponding to the RLC entity is higher than the priority of one or more other logical channels, if yes, then perform step 103; otherwise, the process ends;

[0057] The other logical channel in the present invention is a channel that provides data transmission function for the same UE together with the logical channel;

[0058] The priority higher than one or more of other logical channels means that the logical channel has the highest priority or is higher than other logical channels.

[0059] Step 103, the RLC layer notifies the RRC layer that the number of RL...

Embodiment 2

[0063] In this embodiment, RRC detects the radio link failure according to the priority of the logical channel, and the specific process is as follows Figure 5 Shown:

[0064] Step 201, the number of RLC PDU retransmissions in the RLC entity in acknowledgment mode reaches the maximum number of retransmissions set by the system;

[0065] Step 202, the RLC notifies the RRC layer that the number of RLC PDU retransmissions in the RLC entity reaches the maximum number of retransmissions, and simultaneously reports the logical channel ID corresponding to the RLC entity;

[0066] Step 203, the RRC judges whether the priority of the logical channel is higher than the priority of one or more of other logical channels according to the logical channel ID, if yes, execute step 204; otherwise, the process ends;

[0067] Step 204, the RRC layer starts the RLF processing flow.

Embodiment 3

[0069] In this embodiment, the RLC layer detects that the wireless link fails according to the PLCPDU retransmission times of other logical channels before the RLF detection timer expires. The specific process is as follows: Image 6 Shown:

[0070] Step 301, the number of RLC PDU retransmissions in the RLC entity in the confirmation mode reaches the maximum number of retransmissions set by the system;

[0071] Step 302, the RLC layer starts the RLF detection timer;

[0072] The duration of the RLF detection timer is configured by the evolved base station (eNB) through system messages or RRC dedicated signaling.

[0073] The RRC dedicated signaling refers to the RRC signaling sent to a specific UE.

[0074] Step 303. Before the RLF detection timer expires, if the number of retransmissions of RLC PDUs in other RLC entities reaches the maximum number of retransmissions, execute step 304; otherwise, the process ends.

[0075] The other RLC entity in the present invention is an...

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Abstract

The invention provides a method for detecting radio link failure, and relates to the field of communications. The method comprises the following steps of: when the retransmission times of a radio link control protocol data unit (RLC PDU) on a logic channel of user equipment (UE) achieves the preset maximum retransmission times, acquiring the priority of the logic channel by the UE; and if the priority of the logic channel is higher than the priorities of one or more logic channels in other logic channels of the UE, determining that a radio link of the UE has radio link fails.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method for detecting radio link failure (Radio Link Failure, RLF). Background technique [0002] The third-generation mobile communication Long Term Evolution (LTE) system consists of Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN), user equipment (User Equipment, UE), and evolved packet core Network (EvolvedPacket Core, EPC) composition. like figure 1 As shown, the E-UTRAN is composed of a base station eNB, a Mobility Management Entity (MME), and a Serving-Gateway (S-GW). The eNB is connected to the MME and the S-GW through the S1 interface. They are connected through the X2 interface. [0003] In order to support a higher air interface data rate, the E-UTRAN uses an Orthogonal Frequency Division Multiple Access (OFDMA) technology as an air interface technology. The air interface protocol stack of E-UTRAN is...

Claims

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Application Information

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IPC IPC(8): H04W24/04H04W76/02
Inventor 王冠宙陈思艾建勋
Owner ZTE CORP
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