Uplink synchronization method and device under asymmetric uplink carrier aggregation
A carrier aggregation, asymmetric technology, applied in the field of communication
Active Publication Date: 2018-11-02
CHENGDU TD TECH LTD
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Problems solved by technology
[0005] The present invention provides an uplink synchronization method and device under asymmetric uplink carrier aggregation to solve the uplink synchronization problem under asymmetric uplink carrier aggregation scenarios
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[0068] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0069] The uplink synchronization method and device under the asymmetric uplink carrier aggregation provided by the present invention are used to solve the uplink synchronization problem under the asymmetric uplink carrier aggregation scenario, and will be described in detail below with reference to the embodiments.
[0070] figure 2 It is a flow chart of Embodiment 1 of the uplink synchron...
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The invention provides an uplink synchronizing method under asymmetric uplink carrier aggregation and devices. The uplink synchronizing method comprises the steps of transmitting a random access preamble by UE to a base station on an uplink auxiliary carrier, thereby calculating an initial timing advance by the base station according to a random access preamble sequence in the random access preamble, and transmitting a random access response which comprises the initial timing advance to the UE on a downlink main carrier, wherein the random access response carries the identification of the uplink auxiliary carrier; after the UE receives the random access response, transmitting data to the base station on the uplink auxiliary carrier according to the identification of the uplink auxiliary carrier and the initial timing advance; after completion of random access, receiving the timing advance and the identification of the uplink auxiliary carrier transmitted on the downlink main carrier by the UE; and performing uplink synchronization by the UE according to the timing advance and the identification of the uplink auxiliary carrier. The uplink synchronizing method under asymmetric uplink carrier aggregation and the devices settle an uplink synchronization problem under an asymmetric uplink carrier aggregation scene.
Description
technical field [0001] The present invention relates to the field of communication technologies, in particular to an uplink synchronization method and device under asymmetric uplink carrier aggregation. Background technique [0002] In an existing Long Term Evolution (LTE for short) system, a single carrier supports a maximum system bandwidth of 20M, and if a larger bandwidth is required, a carrier aggregation technology needs to be used. In the private network, there are a large number of applications such as video surveillance services. The uplink service requirements of this type of service are greater than the downlink service requirements. In this case, a carrier aggregation solution is needed to meet the needs of the industry network. [0003] An asymmetric uplink carrier aggregation method is proposed in the prior art, which can meet the scenario where the service demand of the uplink is greater than the service demand of the downlink. In this method, for example, th...
Claims
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IPC IPC(8): H04W56/00H04W74/08
Inventor 程浩徐绍君王亮
Owner CHENGDU TD TECH LTD