Scheduling method for three-dimensional MIMO downlink multi-user transmission system
A technology of transmission system and scheduling method, applied in the direction of transmission system, radio transmission system, electrical components, etc., can solve problems such as huge overhead and difficulty in accurately obtaining channel state information
Active Publication Date: 2019-08-27
SOUTHEAST UNIV
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When the base station obtains the channel state information, for the TDD system, due to the reciprocity of the uplink channel and the downlink channel, the corresponding downlink channel information can be obtained through the uplink channel estimation; in the FDD system, since the uplink and downlink are respectively in At different frequency points, there are obvious differences in the channel characteristics of the two. There is no reciprocity between the uplink and downlink channels. The feedback of the downlink instantaneous channel state information brings huge overhead, and it becomes difficult to accurately obtain the channel state information.
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[0048] The technical scheme of the present invention is described in further detail below:
[0049] Method of the present invention mainly comprises the following steps:
[0050] Step 1. In the initial state, set all user priorities to 0, that is, c k =0,k=1,...,L, where c k for the kth user U k priority; then each scheduling slot will first set the scheduled service users Initialize to an empty set and add all users to the unscheduled user set
[0051] Step 2: User scheduling is performed by using a signal-to-interference ratio scheduling method or a signal-to-leakage ratio scheduling method.
[0052] The signal-to-interference ratio scheduling method is carried out as follows:
[0053] a1) For the kth user U k ,calculate and in and respectively The ith diagonal element of and The jth diagonal element of ;
[0054] a2) order l=0,
[0055] a3) Computation set The average energy of the useful signal for each user in , the set The k′th user in is a...
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The invention discloses a three-dimensional multiple-input multiple-output downlink multi-user transmission system scheduling method, two user scheduling methods in the three-dimensional multiple-input multiple-output downlink multi-user transmission system using a uniform planar antenna array, and each of the two methods is The user sets a priority. In the initial state, all user priorities are set to 0, and then each scheduling time slot first sets the scheduled service users Initialize to an empty set and add all users to the unscheduled user set , and then use the statistical channel information to calculate the signal-to-interference ratio metric or signal-to-leakage ratio metric for user scheduling. After the user scheduling is completed, the set The priority of all users in the group is set to 0, and the set of unscheduled users The user priority in all increases by 1 until the highest priority Q is reached. The present invention has the advantages of small amount of required channel information and low computational complexity, can flexibly set different thresholds to satisfy different user service qualities, and can take into account user fairness and system throughput at the same time.
Description
technical field [0001] The invention relates to the technical field of user scheduling, in particular to a scheduling method for a three-dimensional MIMO downlink multi-user transmission system. Background technique [0002] As the number of users using high-speed data services continues to increase, users' requirements for service quality of various types of services are also increasing. This rapid development makes wireless communication technology face various new challenges. In a wireless communication system, the spectrum resources of the same channel are shared by several users. The user scheduling method can analyze the characteristics of the wireless channel, and determine a reasonable and different resource allocation algorithm according to the overall performance of the system and the characteristics of the user's business type. guidelines to improve system performance. The user scheduling method is one of the important technologies that enable users to obtain a f...
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IPC IPC(8): H04W72/12H04B7/0452
CPCH04B7/0452H04W72/121H04W72/542H04W72/566
Inventor 李潇孙婷婷高西奇
Owner SOUTHEAST UNIV