Implementation method and device for cooperative transmission

Abstract

The invention discloses a method and device for realizing cooperative transmission, the method comprising: each base station sends its cooperation notification priority information to other base stations, wherein the cooperation notification priority information is used to determine the order in which the base stations send the cooperation notification ; Each base station determines the order in which the base station and other base stations send the cooperation notification according to its own cooperation notification priority information and the cooperation notification priority information from other base stations, and sends the cooperation notification according to the determined order. Through the present invention, each base station can determine the order in which it and other base stations send cooperative notifications, avoiding cooperative scheduling between base stations through multiple iterations, simplifying the signaling process, reducing time delay, and effectively It helps to quickly realize multi-point coordinated transmission, significantly improves the transmission efficiency between base stations and the working ability of the system, and can effectively overcome the problem of resource collision in the cooperation request.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a method and device for implementing cooperative transmission. Background technique [0002] In the Long Term Evolution-Advance (LTE-A for short) system, in order to reduce the adjacent cell interference of the user terminals at the cell coverage edge and improve the user experience at the cell edge, Coordinated-Multiple-Point Transmission (Coordinated-Multiple- Point, referred to as CoMP) technology. CoMP technology is the cooperation among geographically separated multiple base stations (eNBs). Generally, multiple eNBs refer to eNBs of different cells, or an eNB of one cell and multiple remote radio heads (Remote Radio Heads, RRH for short) controlled by it. Coordinated multi-point transmission technology can be divided into downlink cooperative transmission and uplink joint reception. The downlink coordinated multi-point transmission includes technolog...

AI Technical Summary

Problems solved by technology

In addition, cooperation between multiple eNBs in an actual system may cause collisions between two or more eNBs sending cooperation requests to each other

Specifically, for a certain eNB, the collision situation can be described as: after the eNB sends the cooperation request information corresponding to a certain time-frequency resource (or space resource) to the neighboring eNB, it has not received the neighboring eNB. The cooperation notification information of the eNB corresponding to the time-frequency resource, but the cooperation request information corresponding to the time-frequency resource of the neighboring eNB or other neighboring eNBs has been received, and the above-mentioned cooperation request information has not expired

At this time, the eNB cannot use the silent resources of the other party for transmission, not only does not improve the transmission performance through cooperation, but reduces the transmission performance of both parties

Moreover, once a collision occurs, if it is resolved through further interaction and coordination information, further collisions are likely to occur

Therefore, further interaction not only cannot effectively solve the problem of collision, but may also bring new problems

[0016] From the above description, it can be seen that in the existing CoMP transmission scheme, the central cooperative scheduling method is mainly designed for the ideal backhaul link. In the case of a non-ideal backhaul link, the CSI Outdated, the accuracy of resource scheduling, precoding matrix selection, and link adaptation will be greatly affected, thereby affecting the transmission performance of coordinated multi-point transmission technology; on the other hand, non-central cooperative scheduling using iterative scheduling between cells Although the scheme can reduce the amount of information exchanged on the network side in a simple scenario and achieve the purpose of reducing the delay to a certain extent, however, due to the lack of centralized scheduling by CCN, the non-central cooperative scheduling scheme is prone to collaborative requests The collision, and, in order to solve the collision, it also needs multiple scheduling information exchanges between the cooperating eNBs, which leads to the outdated CSI and similar problems

[0017] Therefore, no matter whether centralized cooperative scheduling or non-centralized cooperative scheduling is adopted, the delay caused by information interaction on the network side cannot be effectively reduced, which in turn has a negative impact on system performance.

However, for the above problems, no effective solution has been proposed

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