Method and system for accessing uplink of user equipment to base station randomly, base station and user equipment

Abstract

The embodiment of the invention relates to a method and a system for accessing an uplink of user equipment (UE) to a base station randomly, the base station and the user equipment. In the embodiment of the invention, the base station assigns uplink carrier identification information to the UE, so that the UE can be prevented from sending random access codes by selecting uplink carriers randomly and the uplink carrier can also be prevented from being limited to send the random access codes by corresponding to downlink carriers, so the method and the system are favorable for accessing load balance; the same random access codes can be configured on the same subframes of different uplink carriers to be sent, so the same random access codes and the same physical random access channel indexes can be distributed to different UE (corresponding to different uplink carriers); therefore, the utilization rate of the random access codes is improved greatly.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and system for uplink random access of user equipment to a base station, a base station and user equipment. Background technique [0002] When the standardization of the Long Term Evolution (LTE for short) system is nearly completed, the Long Term Evolution-Advanced (LTE-A for short) system starts to start. LTE-A must be a smooth evolution of LTE, maintain backward compatibility with LTE R8 version, support higher bandwidth in terms of spectrum of LTE-A system, and support continuous or discontinuous use of spectrum of LTE system. Representative key technologies for the evolution of LTE-A systems include carrier aggregation and multi-antenna technology enhancement. [0003] In the LTE system, after the downlink (from the base station to the UE) of the user equipment (referred to as UE) is synchronized, it receives the broadcast master information block (M...

AI Technical Summary

Problems solved by technology

[0005] However, in the LTE-A system, due to the existence of carrier aggregation technology, both the uplink carrier and the downlink carrier may be the aggregation of multiple carriers, and there is a scenario where there are multiple uplink carriers corresponding to one downlink carrier. In this scenario, A downlink carrier may carry information of multiple uplink carriers

According to the uplink random access process in the existing LTE system, after receiving the random access code issued by the base station (eNB) and the physical random access channel index (PRACH MaskIndex) corresponding to the uplink random access resource, the UE can Clearly send the random access code in the uplink random access resource corresponding to the physical random access channel index (that is, one or some subframes of the information frame), but it is not clear which uplink carrier the UE will use the random access code on send on

In addition, in a multi-carrier LTE-A system, in the scenario where one downlink carrier corresponds to one uplink carrier, if the uplink random access process is still performed on the uplink carrier corresponding to the downlink carrier, it will be unfavorable for the access load. balance

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