Method and device for realizing cooperative transmission

Abstract

The invention discloses a method and a device for realizing cooperative transmission. The method comprises: each base station sending a cooperation notification priority message thereof to other base stations, the cooperation notification priority message being used to determine sequence for the base station to send cooperation notifications; and each base station determining the sequence of the base station and other base stations to send the cooperation notifications according to the self cooperation notification priority message and the cooperation notification priority message from other base stations, and sending the cooperation notifications according to the determined sequence. Through the method, each base station can determine the sequence for the base station and other base stations to send cooperation notifications, thereby preventing cooperation dispatching among the base stations through a multiple iteration method, simplifying signaling procedures, reducing time delay, being beneficial for rapidly realizing multi-point cooperative transmission, and obviously improving transmission efficiency among base stations and working capability of a system, and problem that resource impact occurs to the cooperation request can be effectively overcome.

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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