Joint carrier allocation and time sharing for OFDMA/TDMA networks
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsZafer Sahinoglu, Yi Huang, Qinghe Du, Zhifeng Tao, Ghulam Bhatti, Jinyun Zhang
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Abstract
A method and system provide multiple-access control and frequency band allocation, and transmission time sharing among multiple users in orthogonal frequency-division multiple-access (OFDMA) and time-division multiple-access (TDMA) networks. The method can be applied to uplinks and downlinks of multi-user, multi-carrier communication networks. Under a total transmission-power minimization constraint, the method can allocate carriers and transmission time to users optimally, and at the same time, can guarantee a data rate or equivalently a latency requirement of each user.
Claims10
A method for allocating resources to a set of mobile stations (MS) communicating with a base station (BS) in an orthogonal frequency-division multiple-access (OFDMA), and time-division multiple-access (TDMA) network, comprising:
- optimizing a total power consumption P by the set of MSs by minimizing the power P according to
- P
- =
- min
-
- ∑
- k
- =
- 1
- K
-
-
- ∑
- n
- =
- 1
- N
-
- t
- k
- ,
- n
-
- (
- 2
- c
- k
- ,
- n
- -
- 1
- )
-
- σ
- 2
- α
- k
- ,
- n
- 2
- ,
- subject to
- ∑
- n
- =
- 1
- N
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- Bt
- k
- ,
- n
-
- c
- k
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- n
- ≥
- R
- k
- ,
- for k=1, 2, . . . , K, where
- ∑
- k
- =
- 1
- K
-
-
- t
- k
- ,
- n
- =
- 1
- ,
- for n=1, 2, . . . , N, tk,n≧0
- for all k and n, and ck,n≧0 for all k and n, wherein K is a number of MS k, N is a number of frequency bands n, t is a transmission time interval for each symbol, c is a data rate in bits per symbol, σ2 is additive white Gaussian noise (AWGN) power, αk,n is a power gain of each channel, B is a bandwidth of each channel in Hz, Rk is a guaranteed data rate in bits per second for each MS;
- and
- transmitting the symbols from the set of MS to the BS with power according to the optimized total power consumption.
Dependencies are inferred from the claim text.