Final report on link level and system level channel models - Winner

WINNER D5.4 v. 1.4
6.3.4 Multihop and relaying
Typically, the links between the MS and the links between the BS are not of interest. Cellular systems are
traditionally centric networks where all traffic goes through one or more BS. The BS themselves again
only talk to a BS hub and not between them.
Multihop and relaying networks break with this limitation. In multihop networks, the data can take a route
over one or more successive MS. Relaying networks, on the other hand, employ another level of network
stations, the relays, which depending on the specific network, might offer more or less functionality to
distribute traffic intelligently.
<
06
%6
%6
06
06
%6
%6
06
;
Figure 6.5: Multihop and relaying scenarios.
In the example figure above the signal from MS1 to BS3 is transmitted via MS3 and BS2 act as a repeater
for BS1. These scenarios can be generated by introducing a BS-MS pair into position of a single BS
serving as a relay or into position of a single MS serving as a multihop repeater. In these cases one can
apply path-loss models of feeder scenarios described in section 3.2.4. The resulting procedure is as
follows.
1. Set base station BS1 to BS3 locations and array orientations according to layout.
2. Set mobile locations MS1 to MS3 and array orientations according to layout.
3. Add extra base station BS4 to position of MS3 and extra mobile MS4 to position of BS2 with
same array orientations and array characteristics as MS3 and BS2 respectively.
4. Set the pairing matrix to
⎡0
1 0 0⎤
⎢ ⎥
⎢
0 0 0 1
A =
⎥
⎢0
0 1 0⎥
⎢ ⎥
⎣1
0 0 0⎦
5. Generate all the radio links at once.
6. Simulate the channel segments in parallel.
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