Method and device for synchronous cell maintenance of multi-carrier communication system

A multi-carrier communication and cell synchronization technology, applied in the field of communication, can solve the problems of not giving synchronization status maintenance, unable to maintain cell synchronization status, etc., to achieve the effect of ensuring backward compatibility and reducing complexity

Inactive Publication Date: 2013-02-13
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After introducing the concept of grouping and multi-TA, if TAT is still started and maintained on the primary serving cell, the synchronization status of the cells in the group containing only the secondary serving cell cannot be maintained
In addition, although using one TAT to maintain the synchronization state can make the UE less complex and ensure backward compatibility, but in the case of multiple cell groups in the carrier aggregation system, there is no way for the UE to use only one TAT. A solution for synchronization state maintenance of cells in groups containing only secondary cells for all cells

Method used

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  • Method and device for synchronous cell maintenance of multi-carrier communication system
  • Method and device for synchronous cell maintenance of multi-carrier communication system
  • Method and device for synchronous cell maintenance of multi-carrier communication system

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Embodiment 1

[0054] In this embodiment, the TAT maintenance process, the synchronization / out-of-synchronization maintenance of the secondary cell in the group containing only the secondary cell, and the TAT timeout processing are respectively described by adopting the technical solution provided by the embodiment of the present invention.

[0055] 1. TAT maintenance process

[0056] In this embodiment, the UE starts the TAT when receiving the RAR during the random access process of the primary cell, and restarts the TAT when the UE receives the MAC control element (ie TAC) including the time adjustment of the primary cell. However, addition, activation, deactivation, uplink synchronization and deletion of the secondary cell do not have any impact on the TAT.

[0057] When the UE receives the TAC for time adjustment of the packet containing only the secondary cell, it does not have any impact on the above TAT. The TAC used by the group containing only the secondary cell can be received by th...

Embodiment 2

[0086] Figure 4 is the signaling flow chart of Embodiment 2 of the present invention, such as Figure 4 As shown, the synchronization state maintenance in this embodiment mainly includes the following steps:

[0087] Step 401: The UE initiates an RRC connection on CC1, and starts TAT ​​after receiving the TA in the random access response message during the random access process on CC1; the base station configures the information of CC2 and CC3 to the UE in the RRC connection reconfiguration message and group information. CC1 is the primary serving cell, forming group 1, CC2 and CC3 are secondary serving cells, forming group 2; configure the TAT duration on CC1 as 1280ms; configure the secondary cell deactivation timers of CC2 and CC3 as infinite in the base station; after the secondary cells are activated If no uplink synchronization command from the base station is received within a certain period of time, it is considered that there is no need to initiate uplink synchroni...

Embodiment 3

[0099] Figure 5 It is a signaling flowchart of cell synchronization state maintenance in the multi-carrier communication system in Embodiment 3 of the present invention, as shown in Figure 5 As shown, the cell synchronization state maintenance in this embodiment mainly includes the following steps:

[0100] Step 501: The UE initiates an RRC connection on CC1, and starts TAT ​​after receiving the TA in the random access response message during the random access process on CC1; the base station configures the information of CC2 and CC3 to the UE in the RRC connection reconfiguration message and group information. CC1 is the primary serving cell, forming group 1, CC2 and CC3 are secondary serving cells, forming group 2; configure the TAT duration on CC1 as 1280ms; configure the secondary cell deactivation timers of CC2 and CC3 as infinite in the base station; after the secondary cells are activated If no uplink synchronization command from the base station is received within ...

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Abstract

The invention discloses a method and a device for synchronous cell maintenance of a multi-carrier communication system. The method comprises the steps: under the condition that a plurality of cell subgroups exist, when user equipment maintains a time alignment timer (TAT) only in a subgroup containing a main cell, the user equipment determines whether an auxiliary cell in a subgroups containing the auxiliary cell only in a synchronization state according to a predetermined rule or an indication of a base station. The method and the device disclosed by the invention have the advantage of solving the problems that because the user equipment maintains the TAT only in the subgroup of the main cell, the UE cannot acquire the synchronization condition of a cell in the subgroup only containing the auxiliary cell and thus is likely to carry out uplink signal transmission when the cell in the auxiliary cell subgroup is in a step-out state and a base station side cannot receive uplink signals transmitted by the cells correctly.

Description

technical field [0001] The present invention relates to the communication field, in particular to a cell synchronization maintenance method and device for a multi-carrier communication system. Background technique [0002] The Long Term Evolution Advance (LTE-Advanced for short) introduces many new technologies to meet the basic requirements of the International Mobile Telecommunication Advance (IMT-Advance for short), the most important of which is One technology is carrier aggregation. [0003] Due to the shortage of wireless spectrum resources, IMT-Advanced requires a higher peak rate index (supporting 100Mbps under high mobility and 1Gbps under low mobility). The maximum bandwidth of 20MHz in the current LTE standard cannot meet the requirements of IMT-Advanced. Therefore, it needs to be expanded to a higher bandwidth, such as 40MHz, 60MHz, or even higher. One of the methods to increase the bandwidth and peak rate is to expand the frequency domain. For example, several...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04W74/08
Inventor 万璐陈中明黄亚达
Owner ZTE CORP
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