Method, device and system for tti-b activation and deactivation synchronization

Abstract

The invention discloses a TTI-B activation and deactivation synchronization method, device and system, and relates to the field of LTE. The method includes: the base station sends an RRC connection reconfiguration message to the terminal, and the RRC connection reconfiguration message carries a TTI-B state transition cell; the base station stops the uplink scheduling of the terminal and starts a timer; during the running of the timer, the base station and the terminal according to The TTI‑B state transition cell is configured with state parameters; after the timer expires, the base station resumes the uplink scheduling of the terminal and activates or deactivates the TTI‑B function according to the configured state parameters. The present invention can quickly realize the activation and deactivation of the TTI-B function, overcomes the complex signaling of the handover method in the cell, the long TTI-B activation time, and the random access failure that may cause VoLTE call drop and interference rise. Realize the synchronization of TTI‑B activation and deactivation between the base station and the terminal, and ultimately improve the VoLTE user experience.

Description

technical field [0001] The present invention relates to the field of LTE (Long Term Evolution, 3GPP long-term evolution), in particular to a method, device and system for TTI-B (Transmission Time Interval Bundling, transmission time interval bundling) activation and deactivation synchronization. Background technique [0002] VoLTE (Voice over Long Term Evolution, 3GPP long-term evolution voice) users are severely damaged at the edge of the cell or the channel, and when the coverage is limited, the terminal cannot meet the BLER (Block Error Rat, block error rate) requirements. Therefore, the concept of TTI-B is proposed in VoLTE, which binds multiple consecutive uplink TTIs and allocates them to the same terminal, which can improve the success rate of data decoding and VoLTE uplink coverage, thereby improving VoLTE user experience. [0003] When activating and deactivating the TTI-B function based on the RRC (Radio Resource Control, radio resource control) connection reconfi...

AI Technical Summary

Problems solved by technology

[0004] However, the TTI-B method based on intra-cell handover activation and deactivation has the following problems: First, the activation and deactivation delay is increased, and the intra-cell handover method has handover and random access processes, which consumes resources and complicates the activation and deactivation process , and the activation and deactivation process has a long delay, and the handover in the cell is generally 50ms to 60ms, and the activation speed is slow, which affects the VoLTE experience of edge users

Second, the signaling overhead is increased, based on the intra-cell handover method, the random access process is increased, and in the random access process, the signaling overhead of MSG1, MSG2, MSG3 and MSG4 is increased, which leads to the increase of signaling resources of the base station Excessive consumption

Third, the VoLTE call drop rate increases. Due to the handover failure or random access failure in the process of handover and random access, in this case, VoLTE calls will be dropped, thereby increasing the VoLTE call drop rate. Seriously affect VoLTE user experience

Fourth, random access failure causes interference. Due to random access failure, the terminal will continue to increase the transmission power, and the increase in transmission power will cause interference to other terminals.

In addition, the TTI-B state between the terminal and the base station is out of sync, causing the base station to demodulate data errors and discard them, which eventually causes VoLTE users to increase packet loss, increase delay, and deteriorate MOS, seriously affecting user experience

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