[CLAIMS] [Claim]]
A method for allocating transmission resources in a wireless communications network for performing K individual transmissions between an access point (110; 111) and plural mobile terminals (120, 121, 122; 123, 124), the transmissions occurring in the wireless communications network on a per frame basis, the method being performed by a managing device (100) in charge of allocating the transmission resources for performing the K individual transmissions, signalling information intended to enable the mobile terminals to determine transmission resources that are allocated in a subsequent frame being transmitted in at least one transmission resource of each frame,
wherein, for each one of the K individual transmissions, the managing device has information representative of a signal-plus-interference to noise ratio expected for each transmission resource when used by said individual transmissions, and the managing device has information representative of a signal-plus-interference to noise ratio expected for each transmission resource when said transmission resource is used for transmitting the signalling information,
characterized in that the managing device performs, when considering (S401) allocating transmission resources for the K individual transmissions in a frame identified by an index value /:
obtaining (S402) information representative of the transmission resources allocated beforehand from the frame identified by the index value t-W-T+2 to the frame identified by the index value t-1, wherein W> 1 is a first predefined quantity of successive frames and T> 1 is a second predefined quantity of successive frames;
allocating (S403) transmission resources in the frame identified by the index value t for performing the K individual transmissions and transmission resources in the frame identified by an index value t-x for transmitting the signalling information related to the frame identified by the index value t, by reviewing transmission resources allocations from the frame identified by the

index value t-W+1 to the frame identified by the index value t-1 for maximizing the following expression:
min (P(t -u))
0 1 represents a difference in terms of quantity of frames between the frame identified by the index value t and the preceding frame in which is transmitted the signalling information related to the frame identified by the index value t, and wherein W > x, and
wherein P(t-u) is a figure of merit representative of a probability that at least one message in each one of the K individual transmissions is correctly received between the frame identified by the index value t-u-T+1 and the frame identified by the index value t-u in view of the signal-plus-interference to noise ratio; then
enabling (S404) transmission of the frame identified by the index value t-W-x+J. [Claim 2]
The method according to claim 1, characterized in that, for reviewing transmission resources allocations from the frame identified by the index value t-W+1 to the frame identified by the index value t-1, the managing device allocates all the transmission resources of the frame identified by the index value t, and evaluates changes of the transmission resources allocations from the frame identified by the index value t-W+1 to the frame identified by the index value so as to improve the following expression:
min (P(t-u))
[Claim 3]
The method according to claim 2, characterized in that the figure of merit P(t-u) is defined as follows:
K r T-1 -j
P(t - u) = ["] 1 - Yl (l - (l - EM{k, Rktt-U-T)) (l - EB(k, /?0lt-u-T-*)))
k = l L r^=0

wherein EM[k,Rkx^u^T) represents a probability of error encountered in the individual transmission identified by the index value k by using a set R^t-u-x of at least one transmission resource in the frame identified by the index value t — u — T;
and wherein EB (k, /?0,t-u-T-x) represents a probability of error encountered in the signalling information related to the individual transmission identified by the index value k, which is transmitted using a set R0jt_u_T_x of at least one transmission resource in the frame identified by the index value £ — u — r — x. [Claim 4]
The method according to claim 3, characterized in that, when evaluating said changes of the transmission resources allocations, the managing device starts by testing firstly all possible changes among the transmission resources of the frame showing the worst result of the following expression:
(l " (l " £M(/c/V-u-r)) (l - £B(fc,/*o.t-u-r-*)))
[Claim 5]
The method according to claim 2, characterized in that each frame starts with a fixed field containing further signalling information intended to enable the mobile terminals to determine transmission resources that are allocated in said frame, the figure of merit P(t-u) is defined as follows:
K - r-i -i
P(t~u) = Y] 1 - j~I(a "" (X ~ ^MMU-U-T)) (l " E$(k,t- u - T,fl0,t_u_T_x)))
with
E^{k,t~u~ x, /?0,t-u-T-x) = ElQc, t - u - T). EB(k, R0,t-u~r~x)
wherein EMQc, /?k(t_u_T) represents a probability of error encountered in the individual transmission identified by the index value k by using a set Rk,t-u-T °f at ^east one transmission resource in the frame identified by the index value £ — u — T;
wherein EB(k, /?ot_u_T^y) represents a probability of error encountered in the signalling information related to the individual transmission identified by

the index value k, which is transmitted using a set RQX-U-Z-X °f at least one transmission resource in the frame identified by the index value t — a — r — x,
and wherein Eg(k,t — u — r) represents a probability of error encountered in the signalling information related to the individual transmission identified by the index value k, which is transmitted in the fixed field of the frame identified by the index value t — u — x. [Claim 6]
The method according to claim 5, characterized in that, when evaluating said changes of the transmission resources allocations, the managing device starts by testing firstly all possible changes among the transmission resources of the frame showing the worst result of the following expression:
(l - (l - EM{kt Rkit~u~r)) (l-Eg(k,t-u- r, /V-u-r-*)))
[Claim 7]
The method according to claim 3 or 5, characterized in that, when evaluating said changes of the transmission resources allocations, the managing device starts by testing firstly all possible changes among the transmission resources of the frame identified by the index t-u which shows the worst figure of merit P(t-u). [Claim 8]
The method according to any one of claims 3 to 7, characterized in that each message to be transmitted in the frame identified by the index value t — u — r for the individual transmission identified by the index value k is spread over the set Rk>[_u_T and the probability of error EM\k>Rk,t—u~Tj is expressed as follows:
EM(k, Rkit-u-r) = fM ({pk (/?fcit_u_T(i))} )
wherein fM represents a multi-variable function providing data error rate as a function of a set of signal-plus-interference to noise ratios {/?}, which depends on a behavioural model of physical layer configuration used for performing transmission over the set Rkx^u_T,

and wherein pk lRkt_u_T(i)) represents the signal-plus-interference to
noise ratio expected to be encountered for the message in the transmission resource Rkt^u„T(i) identified by the index / among the set Rk,t~u~x-[Claim 9]
The method according to any one of claims 3 to 7, characterized in that each message to be transmitted in the frame identified by the index value t — u — T for the individual transmission identified by the index value k is uniquely transmitted in one transmission resource, and the probability of error EM{k,Rkx^u.„T) is expressed as follows:
EM{k,Rkx^T) = l-[^(l-//M(pk(/?Jtit_u_T(0)))
i wherein f'M represents a function providing data error rate as a function
of signal-plus-interference to noise ratio p, which depends on a behavioural
model of physical layer configuration used for performing transmission over
the set Rkit-u-r>
and wherein pk [Rkt-u-xiO) represents the signal-plus-interference to
noise ratio expected to be encountered for the message in the transmission resource #*,t-u-r(0 identified by the index / among the set Rjct-u-r-[Claim 10]
The method according to any one of claims 3 to 7, characterized in that each message to be transmitted in the frame identified by the index value t — u — T for the individual transmission identified by the index value k is repeated in each transmission resource of the set Rkit„u-T and expected to be jointly decoded, and the probability of error EM(k,Rkt^u-T) is expressed as follows:
EM\k>Rk.,t~u~T )=/"«(^Pft(«W-U-T(0)J

wherein pk (Rkt-U-T(i)) represents the signal-plus-interfererice to noise
ratio expected to be encountered for the message in the transmission resource Rict-u-xCO identified by the index i among the set /?fc(t_u_T, and wherein f"M represents a function providing data error rate as a function of signal-plus-interference to noise ratio p, which depends on a behavioural model of physical layer configuration used for performing transmission over the set
Rk,t-U-T
[Claim 11]
The method according to any one of claims 3 to 7, characterized in that each message to be transmitted in the frame identified by the index value t — u — r for the individual transmission identified by the index value k is repeated in each transmission resource of the set tf/^-u-r and expected to be decoded independently, and the probability of error Ej^yk, Rki—U„xj is expressed as follows:
EM{k,Rkx_u_T) = ["] (f'"M (pk (fifct_u_T(0)))
wherein f" M represents a function providing data error rate as a function of signal-plus-interference to noise ratio p, which depends on a behavioural model of physical layer configuration used for performing transmission over
the set tf^^,
and wherein pk \Rkx~u~r(0) represents the signal-plus-interference to
noise ratio expected to be encountered for the message in the transmission resource Rjct-u-rCO identified by the index / among the set Rkit_u_T. [Claim 12]
The method according to any one of claims 3 to 10, characterized in that the signalling information to be transmitted in the frame identified by the index value t - u — T — x and related to the frame identified by the index value t — u — r is uniquely transmitted in one transmission resource and the probability of error EB(k, RQ^-U-T-X) IS expressed as follows:

wherein fB represents a function providing data error rate as a function of signal-plus-interference to noise ratio p, which depends on a behavioural model of physical layer configuration used for performing transmission over theset^.^^j.,
and wherein p/f (RQt^u^r^x(i)j represents the signal-plus-interference to
noise ratio expected to be encountered for the signalling information concerning the individual transmission identified by the index k in the transmission resource /?0 t_u__T_x(0 identified by the index / among the set
[Claim 13]
The method according to any one of claims 3 to 10, characterized in that the signalling information to be transmitted in the frame identified by the index value t — u — r — x and related to the frame identified by the index value t — u — x is spread over the set RQJ-U-T-X an<^ expected to be jointly decoded, and the probability of error EB(k, -tf0,t-u-T--x) 1S expressed as follows:
EB(k
-U-T-X (0
wherein f'B represents a function providing data error rate as a function of signal-plus-interference to noise ratio p, which depends on a behavioural model of physical layer configuration used for performing transmission over the set R0it_u_r_x,
and whereinpk (Roj-u-T-xiO) represents the signal-plus-interference to
noise ratio expected to be encountered for the signalling information concerning the individual transmission identified by the index k in the transmission resource /?0)t_u_T_x(i) identified by the index / among the set
KQJ-U-T-X-
[Claim 14]

The method according to any one of claims 3 to 10, characterized in that the signalling information to be transmitted in the frame identified by the index value t — u — x — x and related to the frame identified by the index value t — u — r is repeated in each transmission resource of the set Rot_u_r„x and expected to be decoded independently, and the probability of error EB(k,R0 t_u„T_^) is expressed as follows:
£B(fc,R0.t-a-T-x) = Of7"8 ^ (V-«-T-*(0)))
wherein f"B represents a function providing data error rate as a function of signal-plus-interference to noise ratio p, which depends on a behavioural model of physical layer configuration used for performing transmission over
theset/?0|t_u„T_z,
and wherein pk (#o,t-u~T-x(0) represents the signal-plus-interference to
noise ratio expected to be encountered for the signalling information concerning the individual transmission identified by the index k in the transmission resource Rot._u-.T^x(i) identified by the index / among the set
Ro,t~U-T-X-
[Claim 15]
The method according to any one of claims 1 to 14, characterized in that the difference in terms of quantity of frames between the frame identified by the index value / and the preceding frame in which is transmitted the signalling information related to the frame identified by the index value t equals to "1". [Claim 16]
A managing device (100) for allocating transmission resources in a wireless communications network for performing K individual transmissions between an access point (110; 3 11) and plural mobile terminals (120, 121, 122; 123; 124), the transmissions occurring in the wireless communications network on a per frame basis, signalling information intended to enable the mobile terminals to determine transmission resources that are allocated in a subsequent frame being transmitted in at least one transmission resource of each frame.

wherein, for each one of the K individual transmissions, the managing device has information representative of a signal-plus-interference to noise ratio expected for each transmission resource when used by said individual transmissions, and the managing device has information representative of a signal-plus-interference to noise ratio expected for each transmission resource when said transmission resource is used for transmitting the signalling information,
characterized in that the managing device implements, when considering (S401) allocating transmission resources for the K individual transmissions in a frame identified by an index value t:
means for obtaining (S402) information representative of the transmission resources allocated beforehand from the frame identified by the index value t-W-T+2 to the frame identified by the index value t-*], wherein W> 1 is a first predefined quantity of successive frames and T>1 is a second predefined quantity of successive frames;
means for allocating (S403) transmission resources in the frame identified by the index value / for performing the K individual transmissions and transmission resources in the frame identified by an index value t-x for transmitting the signalling information related to the frame identified by the index value t, by reviewing transmission resources allocations from the frame identified by the index value t-W+J to the frame identified by the index value /-/ for maximizing the following expression:
min (P(t-u))
o 1 represents a difference in terms of quantity of frames between the frame identified by the index value t and the preceding frame in which is transmitted the signalling information related to the frame identified by the index value /, and wherein W > x, and
wherein P(t-u) is a figure of merit representative of a probability that at least one message in each one of the K individual transmissions is correctly received between the frame identified by the index value t-u-T+1 and the

frame identified by the index value t-u in view of the signal-plus-interference to noise ratio; then
means for enabling (S404) transmission of the frame identified by the index value t- W-x+1.