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Method and device for uplink synchronization

A technology of synchronous signal and synchronous sequence, which is applied in the direction of synchronous devices, electrical components, wireless communication, etc., and can solve problems such as large signaling overhead, conflicts, and many channel resources

Active Publication Date: 2017-03-15
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantage of this scheme is that, first of all, considering that potential adjacent UEs only need to send a feedback in response to the ND sounding sequence, the amount of data sent uplink is very small, and relatively, the RA process requires two round-trip signaling Interaction, the overhead of signaling is too large, and too many channel resources are occupied; secondly, there are often more than one potential adjacent UEs at the same time. When they perform the RA process at the same time, the possibility of conflict will be greatly increased. Considering the backoff time In this case, the delay in achieving uplink synchronization through the RA process will also increase greatly

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  • Method and device for uplink synchronization
  • Method and device for uplink synchronization
  • Method and device for uplink synchronization

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Embodiment Construction

[0038] The specific embodiments of the present invention will be described below with reference to the drawings.

[0039] figure 1 It shows a typical wireless network based on infrastructure, with one AP and several UEs with D2D communication capabilities. Without loss of generality, assuming that the wireless network is an LTE-TDD network, the AP is an eNB in ​​the LTE network, and UE2 in the figure has completed uplink synchronization with the eNB. The range of the circle represents the coverage of the D2D communication capability of UE2 The maximum range. As shown in the figure, there are 3 potential neighboring UEs in this range, UE1, UE3, and UE4. However, none of the three UEs has performed uplink synchronization or has lost synchronization. Therefore, in the ND process, it is necessary to obtain the uplink transmission time before sending a feedback message to the eNB.

[0040] figure 2 An uplink synchronization method according to the present invention is shown. First, ...

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Abstract

The invention provides a method for realizing uplink synchronization on user equipment in a wireless network system with at least one access device. The user equipment has equipment-to-equipment communication capability. The method comprises the following steps: the user equipment receives synchronous reference messages sent by adjacent user equipment, wherein the adjacent equipment accomplishes the uplink synchronization with the access device; the user equipment realizes the uplink synchronization with the access device according to the received synchronous reference messages.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, in particular to uplink synchronization technology. Background technique [0002] Generally, in a wireless network based on an infrastructure, two user equipment (UE) communicate via an access device (Access Point for short AP). Typically, in 3GPP's Long Term Evolution (LTE) or LTE-ALong Term Evolution-Advance (Long Term Evolution, or LTE-ALong Term Evolution-Advance), two UEs communicate via one base station (eNB). However, in order to meet the demand for efficient use of network resources and the demand for new services, a requirement for direct device to device (D2D) communication is proposed. Through D2D communication, the load of the base station can be shared, and the coverage of the base station can be increased by means of mobile relay. Therefore, in LTE-A, D2D communication has been accepted as an important enhancement to infrastructure-based wireless mobile communic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00
Inventor 杨凯刘勇吴克颖蔡立羽
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD