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Multi-carrier terminal in-sync regulating and out-of-sync judging method and corresponding devices and systems

A technology of terminal synchronization and adjustment method, which is applied in the directions of synchronization devices, electrical components, wireless communication, etc., to achieve the effect of ensuring data transmission

Inactive Publication Date: 2012-12-26
ZTE CORP
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, the development of technology has no end. After single-carrier HSUPA, technicians continue to consider how to apply the above-mentioned enhanced technologies to multi-carrier HSUPA, for example, how to maintain the distance between the terminal and the base station under the condition of multi-carrier Synchronization is a new problem

Method used

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  • Multi-carrier terminal in-sync regulating and out-of-sync judging method and corresponding devices and systems

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Embodiment 1

[0055] Before performing synchronization adjustment, after the UE is powered on for random access, it first establishes downlink synchronization with the base station. The uplink synchronization method in this embodiment must be performed on the premise that downlink synchronization has been established between the UE and the base station; The distance to the base station is not known, so it cannot guarantee that the uplink signals sent by each UE arrive at the base station synchronously. Therefore, the base station needs to adjust the UE's clock on each TTI so that all UE uplink signals arrive at the base station synchronously.

[0056] Step 1: The UE generates an uplink synchronization sequence (SYNC-UL), puts the sequence in the UpPTS special time slot, or puts it in the random access channel, or puts it in the E-DCH random access uplink control channel, and sends it to the base station ;

[0057] The above-mentioned uplink synchronization sequence is a chip sequence with a leng...

Embodiment 2

[0100] This embodiment describes how the terminal performs synchronization and desynchronization detection, including:

[0101] The multi-carrier terminal receives signals on each carrier, and checks the signals received by each carrier separately, and judges that as long as the signal of one carrier is successfully checked within a predetermined time, it is judged that the terminal is not out of synchronization; judged at the predetermined time If the signals of all carriers in the network fail to verify, it is determined that the terminal is in an out-of-synchronization state.

[0102] If it is determined that the terminal is in the out-of-synchronization state, the terminal and the base station reestablish the wireless link.

[0103] The judging steps specifically include: within the preset synchronization and out-of-synchronization detection timer time, judging that as long as the physical channel signal of one carrier is successfully checked, then it is determined that the termi...

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Abstract

A method, an apparatus and a system for adjusting synchronization and determining synchronization and out-of-synchronization for a multi-carrier terminal are disclosed by the present invention. The method for adjusting synchronization includes that: the multi-carrier terminal sends pilot frequency sequence on each carrier to a base station periodically after accessing a network; the base station determines Synchronization Control Command Word (SS) for each carrier according to the pilot frequency sequence on each carrier sent by the multi-carrier terminal, and sends the corresponding SS on each carrier; and after receiving the SS for all carriers, the multi-carrier terminal determines Timing Advance (TA) according to the received SS, and adjusts the transmission time for each carrier using the determined TA when sending data next time. The present invention can enable each carrier of the multi-carrier terminal to keep synchronization with the base station, ensure data transmission, and enable the terminal to perceive the synchronization and out-of-synchronization status with the base station side, thus performing corresponding processing.

Description

Technical field [0001] The present invention relates to the field of mobile communication, and in particular to a method for multi-carrier terminal synchronization adjustment and synchronization and out-of-synchronization judgment and corresponding devices and systems. Background technique [0002] With the continuous growth of mobile data services, the demand for wireless data communications with high data rates and high system capacity has continued to emerge. At the same time, the wireless system itself must be suitable for transmitting data services with some characteristics, such as high throughput and high burstiness. , High reliability, etc. Therefore, 3gpp introduced the high-speed uplink access technology (HSUPA) from the R8 version. Its main technical enhancements include the introduction of higher-order modulation methods (16QAM, or even 64QAM), the introduction of hybrid automatic repeat request (HARQ), and the introduction of technologies such as fast scheduling con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
CPCH04W56/00
Inventor 朱昀黄春
Owner ZTE CORP
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