WO2003103158A2 - Modeling of hybrid time-code division multiple access communication systems - Google Patents
Modeling of hybrid time-code division multiple access communication systems Download PDFInfo
- Publication number
- WO2003103158A2 WO2003103158A2 PCT/US2003/016139 US0316139W WO03103158A2 WO 2003103158 A2 WO2003103158 A2 WO 2003103158A2 US 0316139 W US0316139 W US 0316139W WO 03103158 A2 WO03103158 A2 WO 03103158A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ues
- transmission power
- snapshot
- power level
- admitted
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/22—Traffic simulation tools or models
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
Definitions
- This invention generally relates to wireless code division multiple access communication systems.
- the invention relates to modeling such systems.
- FIG. 1 is an illustration of a simplified wireless code division multiple access (CDMA) communication system.
- the system has a plurality of base stations 20 ⁇ -20 4 (20) communicating with a plurality of user equipments (UEs) 22 ⁇ -22 ⁇ (22).
- UEs user equipments
- Each UE 22 typically communicates with the base station 20 with the strongest signal.
- UEs 22 may communicate with base stations 20 not having the strongest signal.
- base station 20 2 has a heavier loading (UEs 22 3 -226) than base station 20 3
- UE 22 4 may communicate with base station 20 3 instead of closer base station 20 2 .
- radio resources need to be allocated to the users (UEs 22). This is commonly referred to as radio resource management.
- FDD frequency division duplex
- CDMA code division multiple access
- TDMA time division multiple access
- uplink and downlink con ⁇ inunications are allocated to different time slots within a given frequency spectrum.
- a wireless code division multiple access communication system is modeled.
- a plurality of snapshots is provided.
- Each snapshot has a plurality of user equipments (UEs) and base stations.
- the locations of the UEs in a snapshot vary between the snapshots.
- the UEs are assigned to base stations. Resources are sequentially assigned to each UE or group of UEs and a transmission power level for each UE is determined. For each sequential assignment, an updated transmission power level for any previously assigned UEs is determined. Dropped, served and not admitted (blocked) UEs in the snapshot are determined. Statistics on the performance of the system are gathered using the determined dropped, served and blocked UEs.
- Figure 1 is an illustration of a simplified wireless code division multiple access (CDMA) communication system.
- CDMA code division multiple access
- Figure 2 is a flow chart of a preferred evaluation technique.
- Figure 3 is an illustration of UEs assigned to base stations.
- Figure 4 is an illustration of adding a first UE to a snapshot.
- Figure 5 is an illustration of adding a second UE to a snapshot.
- the embodiments of the invention can generally be used with any type of hybrid time-code domain multiple access system, such as a TDD/CDMA, TDMA/CDMA or time division synchronous code division multiple access (TD- SCDMA) communication system, as well as other types of communication systems.
- a TDD/CDMA Time Division synchronous code division multiple access
- TD- SCDMA time division synchronous code division multiple access
- the preferred model uses a snapshot-based simulation and is described in conjunction with the flow chart of Figure 2.
- the evaluation of a system is performed at a specified instant in time (snapshot).
- Each UE 22 is given a particular location in the communication system, step 24.
- the locations, as well as number, of the UEs 22 are based on the criteria being evaluated in the model.
- differing algorithms for radio resource management are being evaluated for a specified number of users in a system.
- a variety of differing UE locations may be used in different snapshots.
- a particular algorithm's performance is analyzed in each of the snapshots.
- the performance statistics for each algorithm over all of the snapshots is used to determine a best algorithm for the particular loading.
- the UEs 22 may be randomly located in each snapshot to generate the statistics. Alternately, the location of the UEs 22 may be systematically changed to generate the statistics.
- UE mobility may be analyzed. In each snapshot, a UE 22 or UEs 22 are moved in relation to a previous snapshot. Each snapshot may be separated in time from a previous snapshot by a fixed period of time. The impact of this movement is analyzed for a particular resource allocation or for a particular resource management algorithm.
- the UEs 22 are assigned to base stations 20 within the model, step 26. This assignment is illustrated in Figure 3 by double-headed arrows between a UE 22 and its assigned base station 20. Typically, a UE 22 is assigned to the base station 20 having the strongest signal. However, the base station 20 with the strongest signal may not be assigned to the UE 22, such as UE 22 4 , based on the availability of resources.
- uplink and downlink channels do not interfere with each other, such as they are separated by frequency and or time
- the uplink and downlink can be treated as two separate sub-snapshots. This treatment reduces the complexity in analyzing the models.
- the following describes deriving a snapshot where uplink and downlink channels interfere with each other. However, the same approach can be applied to the uplink and downlink separately. The combined statistics can be gathered from the two sub-snapshots.
- each UE 22 is assigned resources of a base station 20 using a resource management algorithm, step 28.
- the UEs 22 may be added in groups. Each group's UEs 22 have little mutual interference.
- the model determines whether sufficient transmission power exists to reach its target channel quality measurement, such as a target signal to noise ratio (SNR) or signal to interference ratio (SIR).
- SNR target signal to noise ratio
- SIR signal to interference ratio
- each user's transmission power level is estimated using an estimated pathloss between the UE 22 and base station 20 and interference estimates, based on the users already connected.
- Equation 1 is one potential equation for use in calculating the transmission power level, T, using a target signal to interference ratio (SIRTARGET).
- T PL • ISCP • SIRTARGET
- Equation 1 PL is the estimated pathloss between the user and base station 20.
- the pathloss may be estimated using the distance between the base station 20 and UE 22.
- ISCP is the interference signal code power.
- the ISCP may be estimated by the transmissions of other users communicating at the same time as the UE 22, such as transmitting in the same time slot, and the distance between the users.
- a first UE 22 ⁇ is added to the model as shown in Figure 4.
- the transmission power level Ti to achieve a desired channel quality is determined. Users for which the power (either uplink or downlink) is insufficient are blocked (not admitted). As additional users are added to the model, their transmission power levels are determined to achieve the desired channel quality taking into account the interference produced by the already added users.
- a second UE 22 2 is added.
- the transmission power level T 2 as shown in Figure 5 is determined using the previously admitted UE's transmission power level Ti. Users may be added one by one or in groups. The groups may be selected so as to minimize their mutual interaction.
- a new transmission power level Ti' for UE 22 ⁇ is determined.
- the adjusting of the UEs' power levels in response to the new user is preferably performed iteratively until the transmission power levels of all the added users converge. Any users whose power levels cannot reach their desired quality are considered to be in outage and are dropped, step 32.
- the transmission power level of a UE 22 is limited.
- a UE's transmission power level must exceed this limit to meet the desired channel quality, that UE 22 can not reach the desired channel quality.
- the model is complete and the snapshot is terminated.
- statistics of the performance of the system are determined, step 34.
- One type of system evaluation may be to determine, after addition of a user, whether a session is dropped or the new user can not be admitted. If an existing user can not reach its desired channel quality, that user is considered not admitted. If a new or existing user can not reach its desired quality after addition of a new user, it is considered a dropped user.
- the number of dropped sessions and the number of sessions not admitted is determined to evaluate the allocation algorithm. It is undesirable to not admit sessions. It is extremely undesirable to drop sessions.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60310711T DE60310711T2 (en) | 2002-05-28 | 2003-05-21 | MODELING OF HYBRID TIME / CODE MULTIPLEX MULTIPLE ACCESS COMMUNICATION SYSTEMS |
AU2003245307A AU2003245307A1 (en) | 2002-05-28 | 2003-05-21 | Modeling of hybrid time-code division multiple access communication systems |
EP03738946A EP1510019B1 (en) | 2002-05-28 | 2003-05-21 | Modeling of hybrid time-code division multiple access communication systems |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US38375702P | 2002-05-28 | 2002-05-28 | |
US60/383,757 | 2002-05-28 | ||
US10/327,303 | 2002-12-20 | ||
US10/327,303 US6704286B2 (en) | 2002-05-28 | 2002-12-20 | Modeling of hybrid time-code division multiple access communication systems |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003103158A2 true WO2003103158A2 (en) | 2003-12-11 |
WO2003103158A3 WO2003103158A3 (en) | 2004-02-12 |
Family
ID=29586574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/016139 WO2003103158A2 (en) | 2002-05-28 | 2003-05-21 | Modeling of hybrid time-code division multiple access communication systems |
Country Status (8)
Country | Link |
---|---|
US (2) | US6704286B2 (en) |
EP (1) | EP1510019B1 (en) |
AT (1) | ATE349817T1 (en) |
AU (1) | AU2003245307A1 (en) |
DE (1) | DE60310711T2 (en) |
ES (1) | ES2276083T3 (en) |
TW (1) | TWI233308B (en) |
WO (1) | WO2003103158A2 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6704286B2 (en) * | 2002-05-28 | 2004-03-09 | Interdigital Technology Corporation | Modeling of hybrid time-code division multiple access communication systems |
US6826411B2 (en) * | 2002-06-27 | 2004-11-30 | Interdigital Technology Corporation | Low power interference signal code power (ISCP) measurement |
US7336957B2 (en) | 2002-10-07 | 2008-02-26 | Interdigital Technology Corporation | System and method for simulation of performance of measurement-based algorithms for slotted wireless communications |
US8125961B2 (en) | 2005-10-25 | 2012-02-28 | Qualcomm Incorporated | Four way handshake for robust channel estimation and rate prediction |
US20090003284A1 (en) * | 2005-12-15 | 2009-01-01 | Chin Choong M | Call Admission Control in an Ad Hoc Network |
JP2007195076A (en) * | 2006-01-20 | 2007-08-02 | Nec Corp | Radio communication system, and transmission power control method and device thereof |
US20080037661A1 (en) * | 2006-08-08 | 2008-02-14 | Adaptix, Inc. | Mobile communication system having multiple modulation zones |
US8554234B2 (en) * | 2007-06-26 | 2013-10-08 | Telcordia Technologies, Inc. | Method and procedures for automatic calibration of a wireless communications system simulation |
EP2101451A1 (en) * | 2008-03-12 | 2009-09-16 | British Telecommunications public limited company | Channel selection in an ad hoc wireless network |
ES2456495T3 (en) * | 2009-12-11 | 2014-04-22 | Deutsche Telekom Ag | Method, antenna management system and program for optimizing the diffusion characteristics of an antenna and method for determining the physical parameters of an antenna |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5671218A (en) * | 1994-04-28 | 1997-09-23 | Lucent Technologies Inc. | Controlling power and access of wireless devices to base stations which use code division multiple access |
US5799154A (en) * | 1996-06-27 | 1998-08-25 | Mci Communications Corporation | System and method for the remote monitoring of wireless packet data networks |
US6014567A (en) * | 1997-02-24 | 2000-01-11 | Lucent Technologies Inc. | Technique for balancing a communication load in a communication network |
US6385183B1 (en) * | 1997-01-29 | 2002-05-07 | Yrp Mobile Telecommunications Key Technology Research Laboratories Co., Ltd. | CDMA power control system |
US6493331B1 (en) * | 2000-03-30 | 2002-12-10 | Qualcomm Incorporated | Method and apparatus for controlling transmissions of a communications systems |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI100043B (en) * | 1992-01-23 | 1997-08-29 | Nokia Telecommunications Oy | Cellular radio network design method and system |
US5920607A (en) * | 1995-12-29 | 1999-07-06 | Mci Communications Corporation | Adaptive wireless cell coverage |
US6603966B1 (en) * | 1997-12-23 | 2003-08-05 | At&T Wireless Services, Inc. | Method and system for optimizing performance of a mobile communication system |
US6871073B1 (en) * | 1999-12-15 | 2005-03-22 | Verizon Laboratories Inc. | Methods and techniques in channel assignment in a cellular network |
US6711404B1 (en) * | 2000-07-21 | 2004-03-23 | Scoreboard, Inc. | Apparatus and method for geostatistical analysis of wireless signal propagation |
ATE467282T1 (en) * | 2000-09-14 | 2010-05-15 | Allen Telecom Llc | METHOD FOR MODELING A CDMA CELLULAR TELEPHONE SYSTEM |
US6810246B1 (en) * | 2000-10-23 | 2004-10-26 | Verizon Laboratories Inc. | Method and system for analyzing digital wireless network performance |
IT1320733B1 (en) * | 2000-10-27 | 2003-12-10 | Cselt Centro Studi Lab Telecom | SYSTEM AND METHOD FOR PLANNING A NETWORK FOR MOBILE TELECOMMUNICATIONS EQUIPMENT. |
US6829491B1 (en) * | 2001-08-15 | 2004-12-07 | Kathrein-Werke Kg | Dynamic and self-optimizing smart network |
US6704286B2 (en) * | 2002-05-28 | 2004-03-09 | Interdigital Technology Corporation | Modeling of hybrid time-code division multiple access communication systems |
-
2002
- 2002-12-20 US US10/327,303 patent/US6704286B2/en not_active Expired - Fee Related
-
2003
- 2003-05-21 WO PCT/US2003/016139 patent/WO2003103158A2/en active IP Right Grant
- 2003-05-21 EP EP03738946A patent/EP1510019B1/en not_active Expired - Lifetime
- 2003-05-21 AU AU2003245307A patent/AU2003245307A1/en not_active Abandoned
- 2003-05-21 ES ES03738946T patent/ES2276083T3/en not_active Expired - Lifetime
- 2003-05-21 AT AT03738946T patent/ATE349817T1/en not_active IP Right Cessation
- 2003-05-21 DE DE60310711T patent/DE60310711T2/en not_active Expired - Lifetime
- 2003-05-22 TW TW092113902A patent/TWI233308B/en not_active IP Right Cessation
-
2004
- 2004-03-04 US US10/792,924 patent/US7133366B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5671218A (en) * | 1994-04-28 | 1997-09-23 | Lucent Technologies Inc. | Controlling power and access of wireless devices to base stations which use code division multiple access |
US5799154A (en) * | 1996-06-27 | 1998-08-25 | Mci Communications Corporation | System and method for the remote monitoring of wireless packet data networks |
US6385183B1 (en) * | 1997-01-29 | 2002-05-07 | Yrp Mobile Telecommunications Key Technology Research Laboratories Co., Ltd. | CDMA power control system |
US6014567A (en) * | 1997-02-24 | 2000-01-11 | Lucent Technologies Inc. | Technique for balancing a communication load in a communication network |
US6493331B1 (en) * | 2000-03-30 | 2002-12-10 | Qualcomm Incorporated | Method and apparatus for controlling transmissions of a communications systems |
Non-Patent Citations (1)
Title |
---|
See also references of EP1510019A2 * |
Also Published As
Publication number | Publication date |
---|---|
US6704286B2 (en) | 2004-03-09 |
US20030223389A1 (en) | 2003-12-04 |
DE60310711T2 (en) | 2007-10-31 |
WO2003103158A3 (en) | 2004-02-12 |
AU2003245307A8 (en) | 2003-12-19 |
US20040185790A1 (en) | 2004-09-23 |
DE60310711D1 (en) | 2007-02-08 |
ES2276083T3 (en) | 2007-06-16 |
AU2003245307A1 (en) | 2003-12-19 |
EP1510019A4 (en) | 2005-08-24 |
TWI233308B (en) | 2005-05-21 |
TW200308172A (en) | 2003-12-16 |
EP1510019B1 (en) | 2006-12-27 |
EP1510019A2 (en) | 2005-03-02 |
US7133366B2 (en) | 2006-11-07 |
ATE349817T1 (en) | 2007-01-15 |
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