USO0RE42047E

(19) United States (12) Reissued Patent

(10) Patent Number:

Kim et a]. (54)

US RE42,047 E

(45) Date of Reissued Patent:

METHOD FOR PROVIDING MULTIPLE

(58)

Field of Classi?cation Search ................ .. 455/450,

SERVICES AND APPARATUS FOR THE SAME

455/451, 452.1, 464; 370/329, 335, 338, 370/342, 349 See application ?le for complete search history. _ References Clted US. PATENT DOCUMENTS

(75) Inventors? Ki JllIl Kim, $30111 (KR); Young J0 Lee, Kyeonggi-do (KR); Young Woo Yun,

Seoul (KR); Suk Hyon Yoon, Seoul

Jan. 18, 2011

(56)

(KR); S0011 Yil Kwon, San Diego, CA US (

)

6,081,536 A

(73)

Assignee: LG Electronics Inc., Seoul (KR)

(21)

Appl. No.1 12/041,533

*

6’09l’717 A

6,111,863 A 6,408,006 B1

6,438,106 B1 2002/ 0090004 A1 2003/0125034 A1

(22)

Filed?

Mar- 3, 2008

f

8/2000 Rostoker et a1. 6/2002 Wolff

8/2002 Pillar et a1. 7/2002 Rinchiuso 7/2003 Weerakoon et a1.

FOREIGN PATENT DOCUMENTS KR

R '

6/2000 Gorsuch et a1. ........... .. 370/468

7/2000 Honkasalo et 31'

Related US. Patent Documents

10-1999-0087794

9/1997

* Cited by examiner

eissue o :

(64) Patent No‘:

7,120,442

Primary ExamlneriSanh D Phu

Oct 10, 2006 10/213,379 Aug. 7, 2002

(74) Attorney, Agent, or FzrmiLee, Hong, Degerman, Kang & walmey (57) ABSTRACT

Foreign Application Priority Data

The present invention provides a method for providing mul tiple services and an apparatus for the same in a Wireless packet data communication system. It guarantees various

Issued: Appl. No.: Filed: (30)

Aug. 8, 2001 (51) Int Cl

(KR) .................................... .. P2001-47750

HOLIQ '7/20

qualities Qfthe services to a plurality ofusers by determining priorities of the mobile stations and an amount of resource

(2006 01)

allocated to each mobile station, and determining priorities

'

(52)

of the multiple services and an amount of resource allocated to each service based on the resource allocated to each

US. Cl. ................... .. 455/450; 455/451; 455/452.1;

mobile Station

455/464; 370/329; 370/335; 370/338; 370/342; 370/349

33 Claims, 1 Drawing Sheet

F __________________________________________ “I

upper layer I“’*_'_ --------- ——TT“ 1

1

user 1

1Q2_1_L4 first

{

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I

Km

I l

user N

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SCI‘VICB

serv1ce+1Qg_K

service

buffer

bu?er

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buffer

l

l

l

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'

- - -

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. _ _ _ _

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10341" ?rst

1 I 1

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F"_" TTTTTTTTT ‘"‘T‘T'l

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buffer‘H'193‘K

4

I l I l

services~se1ection I scheduler “ g 105

l l l I

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L.__.._.._.___.I__-_______l

|_ ________________ ___.|

l

users~se1ection scheduler

~ 106

physical layer

4:»10'?

I.

1 L

l

US. Patent

Jan. 18,2011

US RE42,047 E

FIG. 1

I

upper layer

1» 101

I

...1

"

I02—1

1 I

userl

I l

I l

?rst servlce

buffer

-- -

servica

buffer

services-se1ection scheduler

I

I

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user N



- ' -

service

?rst service

buffer

Km 103——K

buffer

services—selection scheduler

users-selection scheduler

~106

physical layer

+1~ 107 I

US RE42,047 E 1

2

METHOD FOR PROVIDING MULTIPLE SERVICES AND APPARATUS FOR THE SAME

?rst send data to a mobile station (user) among the saved

data, the data which is ?rst inputted from the higher layer in the buffer is transmitted to the corresponding mobile station

?rst regardless of the data’s required quality. In this case,

Matter enclosed in heavy brackets [ ] appears in the original patent but forms no part of this reissue speci?ca

even though services requiring different qualities are sup

ported simultaneously, packet networks handling various

tion; matter printed in italics indicates the additions made by reissue.

qualities of services, such as wireless packet data communi cation and the Internet, are hardly able to support higher quality of services due to the two required services having

CROSS-REFERENCE TO RELATED APPLICATIONS

equalized qualities. As described in an above example, there often exists situ ations that one user utilizes various services having multiple

This application is a reissue application of US. Pat. No.

7,120,442 B2, the entirety ofwhich is incorporated herein by

qualities in the process of supporting the packet data com

reference, which claims the bene?ts of priority under 35 US. C. § 119, 120 to Korean Application No. P2001-47750,

munication. Therefore it is obvious to have additional scheme to take a control in order for each service to handle

?led on Aug. 8, 2001, which is hereby incorporated by refer

hybrid services in the packet networks.

ence as if fully set forth herein.

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a method for providing multiple services, an apparatus for the same in

BACKGROUND OF THE INVENTION

1. Field of the Invention The present invention relates to a communication system, and more particularly, to a method for providing multiple

20

vantages of the related art. In order to achieve this accomplishment, the present

services to each of a plurality of mobile stations in a commu nication system and an apparatus for the same.

2. Discussion of the RelatedArt A current 1x cdma 2000 system is designed to support voice services and low data-rate services in a circuit switched mode. As the demand of wireless Internet services has increased, a new communication tool for only high data rate packet, called HDR (High Data Rate) or lx-EV DO

invention provides a method for providing multiple services 25

and an apparatus for the same in a wireless packet data com

munication system in order to simultaneously provide a plu rality of users with several kinds of qualities of services. An object of the present invention is to provide a ?exible wire less data packet service and increase a throughput of a wire 30

(Ix-Evolution Data Only), has been suggested. This HDR or lxEV-DO is speci?cally designed for a high data-rate of

less packet communication system. Furthermore, the present invention provides an apparatus for providing multiple services to each of a plurality of

packet data other than voice services and offers a bandwidth ef?ciency for a data traf?c that is 3 to 4 times greater than the

current CDMA system. This technology is ideal for high

a wireless packet communication system that substantially obviates one or more problems due to limitations and disad

mobile stations in a communication system including a ?rst 35

speed mobile as well as Fixed wireless Internet services.

scheduler determining priorities of the mobile stations and an amount of resources allocated to each mobile station, and at least one second scheduler, based on the allocated

Besides, there exists another new air interface technology

resources to each mobile station, determining priorities of

called lx-EV-DV (Ix-Evolution Data and Voice) evolved from lx-EV. The lx-EV-DV is capable of providing both high data-rate of the packet data service and voice services

the multiple services and an amount of resources allocated to 40

each service. Preferably, at least one second scheduler determines the

of the circuit switched mode at the same time. Moreover, the lx-EV-DV put forward a system whose voice modes are

priorities of the multiple services by applying a required

fully compatible with the current 1x CDMA voice modes,

munication quality respectively.

and shared channel services such as lx-EV-DO for enhanced data services. In order for the compatibilities of the current 1x cdma 2000, the lx-EV-DV, reusing all common channels from

amount of the resources for each service and a required com 45

higher priority than others. Preferably, the ?rst scheduler and at least one second scheduler are implemented on an upper layer of a physical

cdma 2000, supports Radio Con?guration (hereafter referred to RC). In addition, it is also composed of shared-channels for packet data services as independent RC formats.

50

In the lx-EV-DV system, a plurality of mobile stations receive packet data through one shared-channel. In order to do that, it requires an algorithm to share resources with a

plurality of mobile stations. A scheduler includes the algorithm and thereby ef?ciently

55

allocates the resources of the shared-channel to each mobile

tion will be set forth in part in the description which follows

and in part will become apparent to those having ordinary

ciently. This scheduling method is to allocate limited resources to each mobile station (each user) by considering a channel-link ability and packet transmission delays so as to For instance, data retrieved from a higher layer are saved in a transmission buffer, when the scheduler determines to

In another aspect of the present invention, a method for providing multiple services to each of a plurality of mobile stations in a communication system, includes steps of deter mining priorities of the mobile stations and an amount of resources allocated to each mobile station, and determining priorities of the multiple services and an amount of

Additional advantages, objects, and features of the inven 60

neously allocate the resources to each mobile station e?i

share one shared-channel.

layer.

resources allocated to each service based on the service pri orities within the resources allocated to each mobile station.

station. By the operation of the scheduler, a system through put can be vigorously improved. The primary role of the scheduler is to increase the system throughput and simulta

Preferably, at least one second scheduler allocates more slots and more transmission time to each service having a

skill in the art upon examination of the following or may be

65

learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the writ ten description and claims hereof as well as the appended

drawings.

US RE42,047 E 4

3

accordance With the allocated priorities. The services

It is to be understood that both the foregoing general

description and the following detailed description of the

selection schedulers 104 and 105 for each user, When the

present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Which service should be provided ?rst on its oWn.

system is unable to support multiple services, determine The services-selection schedulers 104 and 105, When the system can provide multiple services to the users, allocates

BRIEF DESCRIPTION OF THE DRAWINGS

relatively more resources among the entire service resources

to the data corresponding to the service having a higher pri

The accompanying draWing, Which is included to provide

ority. For instance, if one user demands tWo simultaneous services from the system and one of them requires a different

a further understanding of the invention and is incorporated in and constitute a part of this application, illustrate

throughput of the data compared to other, the system allo

embodiment(s) of the invention and together With the description serves to explain the principle of the invention. In the draWing;

cates more time slots to the corresponding user and then

starts to perform a schedule for the tWo required services.

Thereafter, the service selection-scheduler (one of 104 and 105) determines Which service-type of data from the tWo service types of data should be transmitted ?rst. At this time, the scheduler can guarantee the quality of service by provid

FIG. 1 illustrates a How chart of scheduling a transmission

in a Wireless packet data communication system. DETAILED DESCRIPTION OF THE INVENTION

ing the higher priorities regarding the services requiring bet ter qualities of service or larger bandWidth demands.

Reference Will noW be made in detail to the preferred

embodiments of the present invention, examples of Which are illustrated in the accompanying draWings. Wherever possible, the same reference numbers Will be used through

20

out the draWings to refer to the same or like parts.

Width to the service demanding higher QoS than the loWer QoS. Therefore, the present invention forming a dual struc

The present invention suggests a method for scheduling

multiple services of upper layers, to guarantee various quali ties of the multiple services supported by a communication

25

examples, using a ?gure, illustrate embodiment(s) of the invention and together With the description serve to explain the principle of the invention.

schedulers. In addition, the dual-structured scheduler selects users in order to improve the system’s performance even though it does not knoWing the service type of packets cur 30

35

Referring to FIG. 1, data generated in the upper layer is

As describe above, the present invention achieves the fol

loWing advantages. 40

Services-selecting schedulers 104 and 105 of the upper layer for each user determine the priorities of services sup

tently.

1, 102-k, 103-1 to 103-k) in order to allocate more resources schedulers 104 and 105 for each user, in case that the system is unable to support multiple services to each user, determine Which service should be provided ?rst on its oWn. A users-selecting scheduler 106 of a loWer layer is designed to determine the priorities of the users in order to

45

Second, by forming a dual-scheduling structure, the con trol over the quality of multiple services can be performed Without transforming the current system. Thanks to this, more demanded various services in the telecommunication

50

allocate more resources to a higher prioritized user on the

purpose of ef?ciently sharing the limited resources With a

plurality of users. That is, the users-selecting scheduler 106 selects the higher prioritized user ?rst and allocates much more resources than the others to the selected user.

First, in the current Wireless packet data communication, the control over the qualities of multiple services becomes feasible, Which hasn’t been done. As a result, the services

demanding higher qualities are possible to support persis

ported by the corresponding data stored in the buffers (102

to the higher prioritized service. Also, the services-selecting

control of quality of multiple services can be done Without

interfering the performance of the current deployed system.

classi?ed for users ?rst, and then the data classi?ed for each user is again classi?ed for different services. After the sec ond classi?cation, the data are respectively saved in several

service-types ofbuffers (102-1, 102-k 103-1 to 103-k).

rently received at the physical layer. On the other hand, the scheduler of the upper layer, depending on the required quality of services by users, selects the data forWarding to the loWer layer regardless of the physical layer. Throughout the described processes, the

FIG. 1 illustrates a How chart of scheduling a transmission

in a Wireless packet data communication system.

ture of scheduling method can better control qualities of

multiple services Without interfering With current deployed

system. The communication system is assumed to provide mul tiple services in a simultaneous Way. Herein, proper

In other Words, the service demanding a higher quality of service (QoS) gets more time slots compared to ones With loWer QoS. In a physical meaning, it allocates more band

system can be accommodated robustly. It Will be apparent to those skilled in the art that various modi?cations and variations can be made in the present invention Without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modi?cations and variations of this invention pro

55

vided they come Within the scope of the appended claims

and their equivalents.

The users-selecting scheduler 106 performs a scheduling

What is claimed is:

for the users Without discriminating a service corresponding

1. An apparatus for providing multiple packet data ser

to the data provided from the upper layer for better system performance. Likewise, in order to ef?ciently allocate

vices to each of a plurality of mobile stations using a packet data channel in a communication system, comprising: a ?rst scheduler con?gured to determine priorities of the

60

resources to the users, the scheduler has a dual structure for

independently scheduling for the services and the users. The detail operation of the scheduler is the folloWing. The services-selection schedulers 104 and 105 allocate the resources provided from the users-selecting scheduler

mobile stations and to determine an amount of resources allocated to each mobile station based on the

determined priorities; and 65

at least one second scheduler, located at a base station,

106, such as a transmission time, slots, or a resource

con?gured to determine an order of priorities of the

bandWidth, to each data corresponding to the services in

multiple packet data services for each mobile station

US RE42,047 E 6

5

mobile terminal based on the priorities for different packet data services and the amount of resources deter

and to determine an amount of resources allocated to

each packet data service of the multiple packet data

mined for the corresponding mobile terminal. 10. The method of claim 9, further comprising: assigning a requested packet data service requiring a higher Quality of Service (QoS) a higher priority than a requested service requiring a loWer QoS. 11. The method of claim 10, further comprising: allocating more bandWidth to the higher priority packet

services based on the amount of resources allocated to

each mobile station by the ?rst scheduler. 2. The apparatus of claim 1, Wherein the at least one sec

ond scheduler determines the order of priorities of the mul tiple packet data services based on a required Quality of

Service (QoS) for each packet data service. 3. The apparatus of claim 2, Wherein the at least one sec ond scheduler allocates more slots and more transmission

data service.

time to each packet data service having a higher priority than

12. The method of claim 10, further comprising: allocating more time to the higher priority packet data

others.

4. A method for providing multiple packet data services to each of a plurality of mobile stations using a packet data channel in a communication system, comprising:

service.

13. The apparatus of claim 1, Wherein the priorities of the multiple packet data services are determined based on a

determining priorities of the mobile stations;

quality of service.

determining an amount of resources allocated to each

14. The method of claim 4, Wherein the priorities of the

mobile station based on the determined priorities of the

multiple packet data services are determined based on a

mobile stations; determining an order of priorities of the multiple packet

20

data services for each mobile station; and

quality of service. 15. The scheduler of claim 7, Wherein the priorities of the multiple packet data services are determined based on a

quality of service.

determining at a base station an amount of resources allo

cated to each packet data service of the multiple packet

16. The method of claim 9, Wherein the priorities of the

data services based on the determined order of packet data service priorities and the determined amount of

multiple packet data services are determined based on a 25

5. The method of claim 4, Wherein the multiple packet

resource is at least one of transmission time, bandWidth, and a number of slots.

data services are determined based on a required Quality of

Service (QoS) for each packet data service. 6. The method of claim 4, Wherein more slots and more transmission time are allocated to each packet data service

30

18. The method of claim 4, Wherein the amount of resource is at least one of transmission time, bandWidth, and a number of slots.

19. The method of claim 9, Wherein the amount of resource is at least one of transmission time, bandWidth, and

having a higher priority than others. 7. A dual structured scheduler for providing multiple packet data services to each of a plurality of mobile users using a packet data channel in a communication system,

quality of service. 17. The apparatus of claim 1, Wherein the amount of

resources allocated to each mobile station.

a number of slots. 35

comprising:

20. A method for providing multiple packet data services

a ?rst scheduler con?gured to determine priorities of each

in each of a plurality of mobile stations using a packet data channel in a communication system, comprising:

user and to determine a quantity of communication

determining an amount of resources allocated to each

resources allocated to each user based on the deter

mined priorities of each user; and second schedulers, located at a base station, con?gured to determine a priority of each inputted packet data in service-Wise regarding each user receiving the inputted packet data and a quantity of communication resources for corresponding packet data services based on the

40

determining at a base station an amount of resource allo

cated to each packet data service of the multiple packet data services based on packet data service priorities 45

priority of each inputted packet data,

a number of slots.

22. The method of claim 20, Wherein the packet data ser

tion resources to each packet data service based on the 50

ers further include a plurality of buffers con?gured to save

data outputted according to the priority of each packet data service.

55

60

24. A methodfor providing multiple packet data tra?ic to each ofa plurality of mobile stations using a packet data receiving packet data from an upper layer of a base station, wherein the received packet data is classified according to mobile stations and packet data tra?ic which are subject to a quality of service (QoS) param eter value; bu?‘ering the received packet data to at least one of a

terminals requesting packet services based on the deter mined call priority; and second determining at a base station, for each mobile

terminal, priorities for different packet data services requested by the corresponding mobile terminal and an

vice priorities are determined based on a quality of service. 23. The scheduler of claim 7, Wherein an amount of resource is at least one of transmission time, bandWidth, and a number of slots.

channel in a communication system, the method comprising:

9. A multiple services allocation method for providing

multiple packet data services, comprising: ?rst determining a call priority and an amount of resources required to support a request packet service for each mobile terminal among a plurality of mobile

Within the resources allocated to each mobile station.

21. The method of claim 20, Wherein the amount of resource is at least one of transmission time, bandWidth, and

Wherein the second schedulers allocate the communica

determined quantity of the resources allocated by the ?rst scheduler. 8. The scheduler of claim 7, Wherein the second schedul

mobile station based on priorities of the mobile sta

tions; and

plurality ofpacket data tra?ic bu?‘ers corresponding to a mobile station andpacket data tra?ic;

amount of resources required to support the different

allocating, by the base station, transmission opportunities within itselffor transmitting data to the plurality of

packet data services requested by the corresponding

mobile stations on the packet data channel, wherein

65

US RE42,047 E 8

7 each allocated transmission opportunity respectively corresponds to each of the plurality of mobile stations;

wherein the received packet data is bufered to at least one

and selecting, by the base station, data to be transmitted to

ing to a mobile station andpacket data tra?ic; a scheduler allocating transmission opportunities within

of the plurality ofpacket data tra?ic bu?‘ers correspond

one mobile station from the plurality ofpacket data tra?ic bu?‘ers based on a priority of the data for trans mitting during one allocated transmission opportunity,

itselffor transmitting data to the plurality of mobile stations on the packet data channel, wherein each allo cated transmission opportunity respectively corre

wherein each of the packet data tra?ic bu?‘ers stores

sponds to each ofthe plurality ofmobile stations,

di?erent packet data tra?icfrom each other correspond ing to the one mobile station.

wherein the scheduler selects data to be transmitted to

25. The method according to claim 24, wherein the prior ity of the data is based upon priority of the data relative to

one mobile station from the plurality ofpacket data tra?ic bufers based on a priority of the data for trans mitting during one allocated transmission opportunity,

the multiple packet data tra?ic. 26. The method according to claim 24, wherein each

wherein each of the packet data tra?ic bu?‘ers stores

transmission opportunity is at least one ofa transmission time and a number ofslots.

diferent packet data tra?icfrom each other correspond ing to the one mobile station.

27. The method according to claim 24, wherein the data

30. The base station according to claim 29, wherein the

selected for transmission from diferent packet data tra?ic bu?‘ers based on the priority of the data are transmitted in order of the priority on the allocated transmission opportu

nity.

priority ofthe data is based upon priority ofthe data relative to the multiple packet data tra?ic. 20

3]. The base station according to claim 29, wherein each transmission opportunity is at least one of a transmission time and a number ofslots.

28. The method according to claim 24, wherein the selec

tion of the data from the plurality ofpacket data tra?ic bu?l ers is further based on a quality of service (QoS) parameter

32. The base station according to claim 29, wherein the

of the data. 29. A base station for providing multiple packet data trafl ?c to each ofa plurality ofmobile stations using a packet

data selected for transmission from di/ferent packet data

25

data channel in a communication system, the base station

comprising: a plurality of packet data tra?ic bufers for receiving packet data from an upper layer of a base station,

wherein the received packet data is classified according to mobile stations and packet data tra?ic which are sub

ject to a quality of service (QoS) parameter value,

tra?ic bu?‘ers based on the priority of the data are transmit ted in order of the priority on the allocated transmission

opportunity. 33. The base station according to claim 29, wherein the 30

selection of the data from the plurality ofpacket data tra?ic bufers is further based on a quality ofservice (QoS) param eter of the data.

ll 1 4

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