| CPC H04W 28/06 (2013.01) [H04W 4/40 (2018.02)] | 11 Claims |
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1. A method for message transfers in a communications network for communication between a road user and at least one further road user, the road user and the further road user each including an evaluation unit, the method comprising the following steps:
receiving a first message in the evaluation unit of the road user, the first message including a plurality of message segments that each is assigned a respective priority value;
determining an instantaneous capacity utilization of the communications network;
determining a priority threshold value as a function of (a) the instantaneous capacity utilization of the communications network and/or (b) respective priority values of previously transferred message segments;
based at least on the priority threshold value, filtering out from the plurality of message segments of the first message a subset of the message segments that are to be transferred out of the first message, based on the priority values and the instantaneous capacity utilization of the communications network;
generating a second message, which includes at least part of the subset of the message segments and none of the filtered out messages; and
sending the second message via the communications network;
wherein the method includes at least one of the following four features (I)-(IV):
(I) (i) the method further includes determining a maximum message size as a function of an instantaneous capacity utilization of the communications network, (ii) the filtering includes comparing the respective priority value of each of the plurality of message segments to the priority threshold value, and filtering out all of the plurality of message segments whose priority value is determined by the comparison to be below the priority threshold value, so that none of the plurality of message segments whose priority value is determined by the comparison to be below the priority threshold value is included in the subset of the message segments, and (iii) the generating of the second message includes selecting from the subset of the message segments taking into account the maximum message size;
(II) the priority threshold value is calculated from a channel busy ratio, so that the priority threshold value increases and/or decreases along with the channel busy ratio;
(III) at least one statistical characteristic is calculated from the priority values of the previously transferred message segments, and the priority threshold value is calculated from the statistical characteristic; and
(IV) the instantaneous capacity utilization of the communications network is calculated as Ra=(1−CBR)*R, Ra is an instantaneously available data transfer rate of a radio channel assigned to the communications network, CBR the channel busy ratio, and R is a data transfer rate of the radio channel.
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