Method and network entity for scheduling radio resources in mobile communication networks

Patent metadata

Field	Value
Publication number	US-9072113-B2
Application number	US-201213985942-A
Country	US
Kind code	B2
Filing date	Feb 17, 2012
Priority date	Feb 17, 2011
Publication date	Jun 30, 2015
Grant date	Jun 30, 2015

Abstract

A method and radio network entity for scheduling resources comprising: selecting the user for which the scheduling metric calculated based on CQI reports is a main maximum in a certain frequency subband and checking whether there is another subband in which the selected user has a calculated scheduling metric value higher than the main maximum. If so, secondary maxima of scheduling metrics for said user and others in another different subband are searched and compared with the previous calculated maximum. According to the result of this comparison, each user is assigned to at least one frequency subband, up to K subbands which can be adjacent or not depending upon the configuration of the network entity in uplink and downlink (e.g., supporting LTE). Scheduling of both time and frequency resources is optimized and simultaneously the throughput of users in a cell is maximized.

First claim

The invention claimed is:

1. A method for scheduling radio resources in mobile communication networks, comprising:
i) defining a set of frequency bands which is assignable to users,
ii) receiving at least a value of channel quality indicator reported from at least a user,
iii) for each reporting user, calculating scheduling metrics based on the received values of channel quality indicator, the scheduling metrics being related to a pair of user and frequency band;
iv) for each frequency band of the assignable set, selecting a user for which the calculated scheduling metric is a main maximum in the frequency band,
v) checking whether there is at least another frequency band of the assignable set in which the selected user has a calculated scheduling metric value higher than the main maximum and if so:
searching secondary maxima of calculated scheduling metrics among all users in another frequency band of the assignable set which is different from the frequency band used in step iv,
for every user and frequency band resulted from the searching, comparing the main maximum of each user with the secondary maxima of the rest of the reporting users, and
assigning at least the selected user to at least one frequency band of the assignable set depending on the comparison used and the result of the comparison;

vi) otherwise, assigning the selected user to at least the frequency band used in step iv.

2. The method according to claim 1 , wherein the set of frequency bands assignable to users are adjacent.

3. The method according to claim 2 , wherein the step iv) comprises selecting one user j determined by the expression

j
=

argmax

j
′

∉
S

⁢

{

sum
*

(

j
′

,
k
,

K
k

)

,

for
⁢

⁢
some
⁢

⁢

K
k

≤
K

}

,

being T jk +T j,k+1 + . . . +T j,k+K k −1 ≡sum*( j,k,K k ),

T jk denotes the scheduling metric of user j calculated in a frequency band k randomly chosen from the set of assignable frequency bands,
being K the maximum number of adjacent frequency bands which is assignable to any user and S denotes a set of users which are already assigned to K adjacent frequency bands.

4. The method according to claim 3 , wherein the step v) comprises checking whether there is another frequency band l from the set of assignable frequency bands in which the selected user j has a calculated scheduling metric with a higher value than the sum of scheduling metrics of user j calculated in the frequency band k and some of its adjacent frequency bands.

5. The method according to claim 4 , wherein searching secondary maxima of calculated scheduling metrics comprises choosing two other users j 1 , 1 2 which are determined respectively by the expressions:

j
1

=

argmax

j
′

∉
S

,

j
′

≠
j

⁢

{

sum
*

(

j
′

,
k
,

K
k

)

}

,
and

j
2

=

argmax

j
′

∉
S

,

j
′

≠
j

⁢

{

sum
*

(

j
′

,
l
,

K
l

)

}

,

and comparing the main maximum of each user with the secondary maxima of the rest of the reporting users comprises checking whether:
sum*( j 1 k,K k )+sum*( j,l,K l )>sum*( j,k,K k )+sum*( j 2 ,l,K l ).

Assignees

• Lorca Hernando Javier
• Telefonica Sa

Inventors

• Lorca Hernando Javier

Classifications

• H04W72/54 Primary

  based on quality criteria · CPC title

• H04W72/542 Primary

  using measured or perceived quality · CPC title

• H04W72/085 Primary

  Electricity · mapped topic

• H04W72/1226

  Electricity · mapped topic