Method for removing random access coupling in FDD (Frequency Division Duplex) LTE (Long Term Evolution) parallel scheduling

Abstract

The invention relates to a method for removing a random access coupling in an FDD (Frequency Division Duplex) LTE (Long Term Evolution) parallel scheduling. The method is characterized by comprising the following steps: starting scheduling and executing uplink and downlink scheduling in a parallel mode; receiving a precursor MSG1 of the random access from UE (User Equipment) at TTI (Transmission Time Interval) N, recording time domain and frequency domain positions for the UE to send the MSG1 in an MAC (Multi-Access Computer) and recording a receiving time TTI N; during uplink scheduling, allocating an uplink resource to MSG3 at the moment of TTI N; and during downlink scheduling, applying a downlink resource of random access response MSG2 at the moment of TTI N+1 for the UE which is allocated with the MSG3, and sending the MSG2. According to the method, the uplink scheduling and the downlink scheduling are used for processing a same random access precursor at different TTI, thereby removing the coupling of uplink and downlink schedulers, saving time in a time-limited system and enhancing the system performance.

Description

technical field [0001] The invention relates to a method in the field of mobile communication for decoupling the uplink and downlink scheduling in the random access process in the FDD LTE parallel scheduling of the third-generation mobile communication long-term evolution system. Background technique [0002] In the LTE system, random access is a way for UE to access a cell. The contention-based random access process mainly includes four messages: MSG1: UE sends a random access preamble; MSG2: eNodeB replies to MSG1, and at the same time indicates in MSG2 UE sends the resource location of MSG3; MSG3: UE uses the uplink resource indicated in MSG2 to send RRC message (usually RRC connection request); MSG4: used for contention resolution. After receiving MSG1, the eNodeB needs to allocate MSG 3 resources to UE in uplink scheduling; at the same time, in the same TTI, it also needs to allocate downlink resources to UE in downlink scheduling for downlink transmission of MSG2, and ...

AI Technical Summary

Problems solved by technology

After receiving MSG1, the eNodeB needs to allocate MSG 3 resources to UE in uplink scheduling; at the same time, in the same TTI, it also needs to allocate downlink resources to UE in downlink scheduling for downlink transmission of MSG2, and will The MSG3 resource applied for is sent to the UE through MSG2. Since the uplink scheduler and the downlink scheduler are concurrent, the uplink and downlink scheduling are coupled together in the processing of MSG3 and MSG2; The row scheduling needs to be synchronized, the downlink scheduler needs to wait for the result of the uplink scheduler, and the scheduling process is a time-limited system, which will lead to a serious decrease in system performance

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