Method for removing random access coupling in FDD (Frequency Division Duplex) LTE (Long Term Evolution) parallel scheduling
A random access and step-by-step technology, applied in the field of uplink and downlink scheduling coupling, can solve problems such as system performance degradation, and achieve the effect of improving system performance and saving time
Active Publication Date: 2012-02-01
WUHAN POST & TELECOMM RES INST CO LTD
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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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[0015] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0016] In the present invention, the resource application of MSG2 lags behind the resource application of MSG3 by at least 1 TTI in time, and the coupling of uplink and downlink scheduling is released, including the following steps:
[0017] 1), start the scheduling, and execute the uplink and downlink scheduling in parallel,
[0018] 2) In uplink scheduling, accept the random access preamble (MSG1) from the UE, store and process it, store it, record the time domain and frequency domain position of the MSG sent by the UE in the MAC, and record the TTI when receiving, the process of processing is Allocating MSG3 uplink resources for the UE;
[0019] 3) In downlink scheduling, process the random access response, that is, MSG2. The process is: query the status of all MSG1 in the cell, and if it has been processed (that is, the uplin...
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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 ...
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IPC IPC(8): H04W72/12H04W74/08
Inventor 颜志凌舒刚李洁
Owner WUHAN POST & TELECOMM RES INST CO LTD