Method for scheduling customer equipment data and packet scheduling device

Abstract

The invention discloses a user equipment data scheduling method, which comprises the following steps: packet scheduler detects whether has reached the scheduling period; if yes, sorting the user equipments UE into different priority sets according to predetermined principles; and selecting a set including the user equipment needing to transmit data in the different priority sets according to priority descending order, and scheduling the data transmission of the user equipment in the selected set. In addition, The invention further discloses a packet scheduler. The technical scheme in the invention, can give higher priority to the users at cell edge, in cell shadow area or performing cell switching; thereby, guarantees the data of the user equipments can be transmitted in time, reduces the data loss caused by RLC layer SDU time-out or cell switching, and improves the transmission speed of the user equipments at cell edge, in cell shadow area or performing cell switching.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method for scheduling user equipment data and a packet scheduler. Background technique [0002] In high speed downlink packet access (High Speed ​​Downlink Packet Access, HSDPA) and high speed uplink packet access (High Speed ​​Uplink Packet Access, HSUPA) systems, in order to use limited channel resources for data transmission and improve the utilization of channel resources, It is necessary to use the packet scheduler to schedule the user's data transmission. At present, the commonly used scheduling algorithms mainly include: [0003] (1) Time-based round-robin scheduling (Round Robin, RR) algorithm: This algorithm ensures that all users in the cell cycle in a certain order to occupy resources with equal time intervals for data transmission, and each user is assigned in sequence Service, get the same average allocation time, the fairness of this algorith...

AI Technical Summary

Problems solved by technology

[0006] In the HSDPA system, due to the poor channel quality of the user equipment (User Equipment, UE) located in the cell edge area or the UE in the shadow area of ​​the cell, data transmission cannot be guaranteed, which may cause radio link control ( The Radio Link Control (RLC) layer Service Data Unit (Service Date Unit, SDU) accumulates too much, so that some RLC SDU data loss occurs due to exceeding the maximum transmission delay before the user's data is scheduled.

In addition, when the user equipment (UserEquipment, UE) performs cell handover, since there is no interface between the two base stations (NodeBs) participating in the UE cell handover process, at the end of the cell handover, unless the original Node B The downlink data transmission belonging to the UE is completed, otherwise the UE will inevitably lose downlink data during the cell handover process, but the channel quality of the user equipment located in the cell edge area or the cell shadow area is also poor during cell handover There is no guarantee, so the user's data transmission during the cell switching process is also prone to loss of data to be transmitted

[0007] Since the existing maximum C / I algorithm only selects the users with the best channel conditions to serve, the cell edge, cell shadow area and cell switching users with poor channel conditions are not considered, and the polling algorithm only takes turns mechanically Serving all users in the cell does not consider the characteristics of poor wireless channel quality of these users, and there is no special treatment for these users. The proportional fairness algorithm considers all users in the cell, which is equivalent to putting all users in the cell in a set After consideration, it does not give priority to scheduling cell edge users, cell shadow area users, and cell handover users. Therefore, the three scheduling algorithms commonly used in the above-mentioned HSDPA / HSUPA system cannot guarantee that the user equipment located in the cell edge and cell shadow area The data to be transmitted of the UE and the UE undergoing cell handover are transmitted in a timely manner, and it is difficult to avoid the loss of user data

[0008] Although the existing technology also stipulates that the automatic retransmission request mechanism can be used to correct transmission errors by configuring the RLC layer of the UE as Acknowledged Mode (AM), and the retransmission can be limited by setting the maximum number of retransmissions or the timeout period. However, the data retransmission mechanism of the RLC layer undoubtedly increases the delay of data transmission, and also cannot transmit data in time, thus affecting the user's quality of service (Quality of Service, QoS) experience, and thus affecting the user's Evaluation of the network

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