Power allocation method and apparatus for providing packet data service in mobile communication system

• US 7,558,231 B2
• Filed: 01/14/2004
• Issued: 07/07/2009
• Est. Priority Date: 06/12/2003
• Status: Expired due to Fees

• Current Assignee: SK Telecom Co., Ltd.
• Original Assignee: Dong Geun Jeong, SK Telecom Co., Ltd.
• Inventors: Park, Chul, Chung, Won Suk, Koh, Kang Il, Jeon, Wha Sook, Jeong, Dong Geun, Park, Yong Gil
• Primary Examiner(s): Kizou; Hassan
• Assistant Examiner(s): Houshmand; Hooman
• Application Number:
  US10/758,028
• Publication Number:
  US 20040253928A1
• Time in Patent Office: 2,001 Days
• Field of Search: 370/318
• US Class Current: 370/318
• CPC Class Codes: H04W 52/286 during data packet transmission, e.g. high speed packet access [HSPA]

Abstract

Provided is a power allocation method and apparatus for providing a packet data service in a mobile communication system is capable of reducing outage of a line service while simultaneously providing the line service and the packet service. It is checked whether or not packet data traffic to be transmitted to a specified mobile station is newly generated. If the packet data traffic is newly generated, it is checked whether or not there is the mobile station making use of the line service where a current call is in progress. If there is the mobile station making use of the line service where the current call is in progress, it is checked whether or not the packet data traffic is currently transmitted to any other mobile station. If the packet data traffic is not currently transmitted to the other mobile station, the power transmitted to the mobile station making use of a new packet data service is gradually increased by a preset increment for a preset predetermined time. Thereby, it is possible to innovatively reduce the outage of the mobile station making use of the line service while simultaneously providing the line service and the packet service as compared with the prior art.

Claims

1. A power allocation method of providing a packet data service with a line service in a mobile communication system having a base transceiver station (BTS) for performing wireless communication with a plurality of mobile stations (MSs), the method comprising the steps of:

(a) determining whether or not packet data traffic is generated for a first MS among said plurality of MSs;

(b) if it is determined in step (a) that the packet data traffic is generated for the first MS, determining whether or not there is a second MS among said plurality of MSs that is currently using the line service with a call being in progress;

(c) if it is determined in step (b) that the second MS is currently using the line service with the call being in progress, determining whether or not there is packet data being transmitted during a current time slot; and

(d) if it is determined that the packet data traffic is generated for the first MS when there is no packet data being transmitted during the current time slot, gradually increasing, at each slot time during a period of time, power allocated to the first MS for providing the packet data service to the first MS;

wherein said method further comprises the step of calculating said period of time which is required for a signal-to-interference ratio (SIR) of the second MS to be restored to a SIR target value when power allocated to the second MS is changed due to the packet data service,

wherein said period of time is calculated from (i) the SIR target value, (ii) peak power of the BTS currently available for the packet data service, and (iii) the power currently allocated to the second MS during the current time slot, and

wherein the power allocated to the first MS in step (d) is gradually increased toward said peak power currently available for the packet data service.

2. The power allocation method as claimed in claim 1, wherein the packet data traffic in the step (a) is generated when the mobile station performs packet data communication including at least one of a wireless application protocol (WAP), a file transfer protocol (FTP) and a hypertext transfer protocol (HTTP).

3. The power allocation method as claimed in claim 1, further comprising the step of, if it is determined in step (b) that there is no MS currently using the line service, allocating the entire peak power currently available for the packet data service to the first MS.

4. The power allocation method as claimed in claim 3, wherein the entire peak power currently available for the packet data service is allocated to the first MS at once.

5. The power allocation method as claimed in claim 1, further comprising the step of, if it is determined in the step (c) that there is packet data being transmitted during the current time slot while the second MS is currently using the line service with the call being in progress, allocating the entire peak power currently available for the packet data service to the first MS.

6. The power allocation method as claimed in claim 5, wherein the entire peak power currently available for the packet data service is allocated to the first MS at once.

7. The power allocation method as claimed in claim 1, wherein in step (d) the power allocated to the first MS is linearly increased by a same preset power magnitude at each said slot time.

8. The power allocation method as claimed in claim 7, wherein in step (d) the power allocated to the first MS is gradually increased up to the peak power currently available for the packet data service.

9. The power allocation method as claimed in claim 1, wherein in step (d) the power allocated to the first MS is non-linearly increased during said period of time.

10. The power allocation method as claimed in claim 9, wherein in step (d) the power allocated to the first MS is gradually increased up to the peak power currently available for the packet data service.

11. The power allocation method as claimed in claim 1, wherein a number n of the time slots in the period of time is calculated as follows:

$n_i={\log }_{\mathrm{\Delta <br><br>}}<br><br>\left[1+\frac{\mathrm{\delta <br><br>\Gamma <br><br>}}{1+\mathrm{\delta <br><br>\Gamma <br><br>}}·<br><br>\frac{P_{\mathrm{Full}}-P_{\mathrm{OH}}-P_{\mathrm{PC}}<br><br>\left(t\right)}{P_i<br><br>\left(t\right)}\right]$ $n<br><br>{=}^{\mathrm{def}}<br><br>\lceil <br><br>n_{\mathrm{avg}}\rceil <br><br>$

where

i is the index indicating a particular MS,

Δ

is the constant representing orthogonality,

Γ

is the SIR target value,

P_FuLL is the peak power available at the BTS,

P_OH is the power allocated to an overhead channel,

P_pc(t) is the power allocated to the line service at the current slot time t,

P_i(t) is the power allocated to the i^th MS at the current slot time t, and

n_avg is the average of all values n_i of all MSs.

12. A power allocation apparatus for providing a packet data service with a line service over a mobile communication network in a mobile communication system having a base transceiver station (BTS) for performing wireless communication with a plurality of mobile stations (MSs), and a base station controller (BSC) connected to a mobile switching center (MSC) and for controlling the BTS,

the BTS comprising

an antenna for performing wireless communication with the MSs;

a transmission section coupled to the antenna for performing wireless transmission by means of the antenna;

a reception section coupled to the antenna for performing wireless reception by means of the antenna;

a data reception section for receiving data to be transmitted from the mobile communication network to the MSs;

a data processing section coupled to the data reception section for processing the data received though the data reception section in accordance with a predetermined algorithm;

a modulation section coupled to the data processing section and the transmission section for modulating the data processed by the data processing section; and

a power section coupled to the transmission section for supplying driving power to the transmission section to allow the data modulated by the modulation section to be transmitted by the transmission section through the antenna;

said power allocation apparatus comprising a control section for

(a) determining whether or not packet data traffic is generated for a first MS among said plurality of MSs;

(b) if it is determined at (a) that the packet data traffic is generated for the first MS, determining whether or not there is a second MS among said plurality of MSs that is currently using the line service with a call being in progress;

(c) if it is determined at (b) that the second MS is currently using the line service with the call being in progress, determining whether or not there is packet data being transmitted during a current time slot; and

(d) if it is determined that the packet data traffic is generated for the first MS when there is no packet data being transmitted during the current time slot, controlling the power section to gradually increase, at each slot time during a period of time, power allocated to the first MS for providing the packet data service to the first MS;

wherein said control section is further configured for calculating said period of time which is required for a signal-to-interference ratio (SIR) of the second MS to be restored to a SIR target value when power allocated to the second MS is changed due to the packet data service,

wherein said period of time is calculated from (i) the SIR target value, (ii) peak power of the BTS currently available for the packet data service, and (iii) the power currently allocated to the second MS during the current time slot, and

wherein said control section is further configured for controlling the power section to gradually increase the power allocated to the first MS at (d) toward said peak power currently available for the packet data service.

13. The power allocation apparatus as claimed in claim 12, wherein the control section resides in the BTS and is coupled to at least said power section.

14. The power allocation apparatus as claimed in claim 12, wherein the control section resides in the BSC.

15. The power allocation apparatus as claimed in claim 12, wherein the control section comprises:

a packet scheduler for receiving data transmitted from the mobile communication network to perform packet scheduling;

a channel estimator for estimating channels according to signals received through the reception section;

a channel allocator for allocating communication channels;

a power allocator for controlling the power section to allocate transmission power; and

a coding and modulating selector for performing coding and modulating of the data.

16. The power allocation apparatus as claimed in claim 12, wherein the control section controls the power section to (e) allocate the entire peak power currently available for the packet data service to the first MS if it is determined at (b) that there is no MS currently using the line service.

17. The power allocation apparatus as claimed in claim 16, wherein the control section controls the power section to (f) allocate the entire peak power currently available for the packet data service to the first MS if it is determined at (c) that there is packet data being transmitted during the current time slot while the second MS is currently using the line service with the call being in progress.

18. The power allocation apparatus as claimed in claim 16 claim 17, wherein the control section controls the power section to allocate at (e) the entire peak power currently available for the packet data service to the first MS. at once.

19. The power allocation apparatus as claimed in claim 18, wherein the control section controls the power section to allocate at (f) the entire peak power currently available for the packet data service to the first MS at once.

20. The power allocation apparatus as claimed in claim 12, wherein the control section controls the power section at (d) to gradually non-linearly increase the power allocated to the first MS during the period of time.

21. The power allocation apparatus as claimed in claim 20, wherein the control section controls the power section at (d) to gradually exponentially increase the power allocated to the first MS during the period of time.

22. The power allocation apparatus as claimed in claim 12, wherein the control section controls the power section at (d) to cause the gradually increasing power allocated to the first MS to be increased up to the peak power currently available for the packet data service.