Radio base station and a method therein for scheduling uplink resources

Patent metadata

Field	Value
Publication number	US-9635674-B2
Application number	US-201214649774-A
Country	US
Kind code	B2
Filing date	Dec 19, 2012
Priority date	Dec 19, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A radio base station (RBS) and a method performed by an RBS for scheduling uplink resources to at least one UE are provided. The RBS comprises at least two receiving antenna branches and the RBS is operable in a radio communication network. The method comprises receiving transmissions from the at least one UE by means of the at least two receiving antenna branches; and determining at least one parameter relating to signal quality of the received transmissions. The method further comprises determining a diversity gain of the at least two receiving antenna branches, wherein the diversity gain is determined based on the determined parameter(s); and scheduling uplink transmissions for the at least one UE based on the determined diversity gain.

First claim

The invention claimed is:

1. A method performed by a Radio Base Station, RBS, for a radio communication network, for scheduling uplink resources to at least one User Equipment, UE, the RBS comprising at least two receiving antenna branches, the method comprising:
receiving transmissions from the at least one UE using the at least two receiving antenna branches;
determining at least one parameter relating to signal quality of the received transmissions;
determining a diversity gain of the at least two receiving antenna branches, the diversity gain being an exponential function of the determined at least one parameter; and
scheduling uplink transmissions for the at least one UE based on the determined diversity gain.

2. The method of claim 1 , wherein the scheduling of uplink resources is dependent on the diversity gain such that the higher the diversity gain, the larger the amount of uplink transmissions are scheduled.

3. The method of claim 1 , wherein the at least one parameter relating to signal quality of the received transmissions is Received Signal Strength Indicator, RSSI.

4. The method of claim 1 , wherein the radio communication network employs one of Code Division Multiple Access, CDMA, and Wideband CDMA, WCDMA, and the at least one parameter relating to signal quality of the received transmissions is one of Received Signal Code Power, RSCP, Signal to Interference Ratio, SIR, and Received Total Wideband Power, RTWP.

5. The method of claim 1 , wherein the radio communication network employs Long Term Evolution, LTE, and the at least one parameter relating to signal quality of the received transmissions is Reference Signal Received Power, RSRP.

6. The method of claim 1 , wherein the radio communication network employs Time Division Multiple Access, TDMA, and the at least one parameter relating to signal quality of the received transmissions is Received Signal Level, RxLev.

7. The method of claim 1 , wherein the method comprises determining more than one parameter relating to signal quality of the received transmissions, wherein the diversity gain of the at least two receiving antenna branches is based on the determined parameters.

8. The method of claim 7 , wherein the RBS comprises N receiving antenna branches, x 0 , x 1 , . . . , xN−1, wherein x 0 is the antenna branch having the strongest signal quality, wherein the diversity gain with regards to one of the parameters is determined as

DivGain
=

1
+

10

-

(

Δ1
10

)

+

10

-

(

Δ2
10

)

+
…
+

10

-

(

Δ
⁢

⁢
N

-
1

10

)

,

where
Δ1=signal quality from x 0 -signal quality from branch x 1 ,
Δ2=signal quality from x 0 -signal quality from branch x 2 , . . . ,
ΔN−1=signal quality from x 0 -signal quality from branch xN−1,
where the signal quality is determined based on the determined parameter(s).

9. The method of claim 1 , wherein the RBS comprises two receiving antenna branches, wherein the diversity gain with regards to one of the parameters is determined as

DivGain
=

1
+

10

-

abs
⁡

(

diff
10

)

,

where “diff” is the difference between the RSSI, RSCP, RSRP, SIR, RTWP or RxLev respectively of the two receiving antenna branches.

10. The method of claim 1 , wherein the transmissions from the at least one UE are received during a predetermined time period, which is between 1 millisecond and several hours.

11. A Radio Base Station, RBS, configured for a radio communication network and for scheduling uplink resources to at least one User Equipment, UE, the RBS comprising at least two receiving antenna branches, the RBS comprising:
a receiving unit configured to receive transmissions from the at least one UE using the at least two receiving antenna branches;
a determining unit configured to determine at least one parameter relating to signal quality of the received transmissions, and configured to determine a diversity gain of the at least two receiving antenna branches, the diversity gain being an exponential function of the determined at least one parameter; and
a scheduling unit configured to schedule uplink transmissions for the at least one UE based on the determined diversity gain.

12. An The RBS of claim 11 , wherein the scheduling unit is further configured to schedule uplink resources dependent on the diversity gain such that the higher the diversity gain, the larger the amount of uplink transmissions are scheduled.

13. The RBS of claim 11 , wherein the at least one parameter relating to signal quality of the received transmissions is Received Signal Strength Indicator, RSSI.

14. The RBS of claim 11 , wherein the radio communication network employs one of Code Division Multiple Access, CDMA, and Wideband CDMA, WCDMA, and the at least one parameter relating to signal quality of the received transmissions is one of Received Signal Code Power, RSCP, Signal to Interference Ratio, SIR, and Received Total Wideband Power, RTWP.

15. The RBS of claim 11 , wherein the radio communication network employs Long Term Evolution, LTE, and the at least one parameter relating to signal quality of the received transmissions is Reference Signal Received Power, RSRP.

16. The RBS of claim 11 , wherein the radio communication network employs Time Division Multiple Access, TDMA, and the a

Assignees

• ERICSSON TELEFON AB L M (publ)

Inventors

• Skärby Ulf
• Ankel Pär
• Egnell Henrik
• Henriksson Maria
• Hogan Billy
• Lamm Anders
• Mjögeman Marc
• Sjöström Gunilla
• Wigren Torbjörn
• Zhang Zhang

Classifications

• H04B7/2618 Primary

  using hybrid code-time division multiple access [CDMA-TDMA] · CPC title

• H04W72/54 Primary

  based on quality criteria · CPC title

• H04B17/328

  Reference signal received power [RSRP]; Reference signal received quality [RSRQ] · CPC title

• H04J3/1694

  Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062) · CPC title

• H04W28/0236

  radio quality, e.g. interference, losses or delay · CPC title