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Channel access via hierarchically organised channel access patterns
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A channel access and pattern technology, applied in the field of communication systems, can solve the problems of asynchrony and the network not coordinating with each other.
Pending Publication Date: 2021-03-19
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
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[0010] If the networks are not coordinated with each other and possibly also not synchronized in time and in the frequency domain, the above methods (tabulation, precomputed hopping patterns) can in principle be applied, however, there are two networks randomly using the same hopping pattern risks of
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Embodiment 1
[0230] At each step n, the associated pseudorandom number R can be obtained from n Integer r derived from n , which can take r min and r max Values between (ie, r min ≤r n ≤r max ). Thus after each active slot in the channel access pattern 110, r can be skipped n slots because they are not used for channel access. The process is Figure 10 exemplarily shown in.
[0231] in detail, Figure 10 The diagram shows resource elements 112 of a channel access pattern 110 projected onto time access according to an embodiment, resulting in unused time slots.
[0232] in other words, Figure 10 An exemplary sequence of used and unused slots according to an embodiment is shown.
[0233] If a number r is derived from a number R such that the elements of r are in r min and r max occur with the same frequency (equal distribution) between them, this gives the following activity rates:
[0234] A=2 / (2+r min + r max ).
[0235] An advantage of the approach presented in the ab...
Embodiment 2
[0238] In an implementation according to embodiment 1, it may happen that longer regions locally have significantly higher or lower activity rates than desired. This effect is avoided in the following examples.
[0239] Here, groups of consecutive time slots are periodically designated, and one active time slot of the channel access pattern is respectively placed in each group. exist Figure 11 In , the case where the activity rate is 1 / 4 (25%) is shown exemplarily.
[0240] in detail, Figure 11 The resource elements 112 of the channel access pattern 110 projected onto the time access according to an embodiment are diagrammatically shown, where the activity rate A=1 / 4.
[0241] in other words, Figure 11 An exemplary sequence of used and unused slots according to an embodiment is shown.
[0242] Such as Figure 11 As shown, slots can be grouped into clusters 114 (in Figure 11 In the example of , the length is 4). Exactly one slot of the channel access pattern 110 is ...
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Abstract
Embodiments relate to a controller for a participant of a communications system, wherein the communications system communicates wirelessly in a frequency band which is used for communication by a plurality of communications systems, wherein the controller is designed to determine a network-specific channel access pattern, wherein the network-specific channel access pattern specifies a frequency- and / or time-hop-based allocation of resources of the frequency band which can be used for the communication of the communications system, wherein the controller is designed to determine a relative channel access pattern, wherein the relative channel access pattern specifies an allocation of resources, to be used for a transmission of data of the participant, from the usable frequency- and / or time-hop-based allocation of resources of the network-specific channel access pattern.
Description
technical field [0001] Embodiments of the present invention relate to a controller for a participant of a communication system, a base station of a communication system, a terminal of a communication system, and a communication system, wherein the communication system performs in a frequency band used for communication by a plurality of communication systems Wireless communication. Some embodiments relate to channel access via hierarchically organized channel access patterns. Background technique [0002] In wireless communication between participants of a communication system in a frequency band used for communication by a plurality of communication systems, it is necessary to avoid interference between participants of a communication system and to avoid interfering signals of other communication systems (= other communication systems communication among participants). [0003] General method used to avoid interference [0004] Interference of participants within the ow...
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