WO2000007399A1 - Apparatus, method of and system for improving capacity in a communications network - Google Patents
Apparatus, method of and system for improving capacity in a communications network Download PDFInfo
- Publication number
- WO2000007399A1 WO2000007399A1 PCT/GB1999/002223 GB9902223W WO0007399A1 WO 2000007399 A1 WO2000007399 A1 WO 2000007399A1 GB 9902223 W GB9902223 W GB 9902223W WO 0007399 A1 WO0007399 A1 WO 0007399A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- duplexing technique
- base station
- terminal
- duplexing
- technique
- Prior art date
Links
Classifications
-
- 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
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
Definitions
- the present invention relates to an apparatus, a method of and a system for improving capacity in a communications network of the type employing a first duplex technique and a second duplex technique, for example, a cellular communications system such as the Universal Mobile Telecommunication System (UMTS).
- UMTS Universal Mobile Telecommunication System
- each direction of communication i.e. from a mobile terminal to a base station (hereinafter referred to as the "uplink") and from the base station to the mobile terminal (hereinafter referred to as the "downlink”), must be separated in order to avoid inter-network interference, i.e. uplink transmissions jamming downlink transmissions, and vice versa.
- the separation can be achieved either in the frequency domain or the time domain.
- the UMTS supports two duplex techniques, namely a Frequency Division Duplex (FDD) technique 100 and a Time Division Duplex (TDD) technique 102.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- uplink communications between an FDD terminal 104 and an FDD base station 106 are via a first band of frequencies 108 and downlink communications between the FDD terminal 104 and the FDD base station 106 are via a second, different, band of frequencies 1 10.
- the two bands of frequencies 108, 110 used by the FDD technique are separated by a further frequency band, known as a duplex distance 1 12.
- the TDD technique permits communication between a TDD terminal
- FIG. 1 is a schematic diagram showing in more detailed the allocation of bandwidth shown in Figure 1.
- the band of TDD frequencies 118 are sub-divided into
- time slots t 0 , ..., t ⁇ 5 of which the first eight time slots t 0 , ..., t 7 are dedicated to downlink traffic and the remaining eight time slots t 8 , ..., t !5 are dedicated to uplink traffic.
- a plurality of TDD terminals U ]5 ..., U n are capable of communicating with the TDD base station 116.
- a first predetermined number of terminals Uj, ..., U m are allocated the first time slot t 0 for downlink transmissions and the ninth time slot t 8 for uplink transmissions.
- other predetermined numbers of terminals are allocated other time slots for uplink and downlink communications.
- the first TDD terminal U] of the first predetermined number of terminals Uj, ..., U m it will be appreciated that after being active during the first time slot to, the first TDD terminal is effectively idle 200 until the beginning of the ninth time slot t 8 , i.e. no transmission or reception is taking place.
- the first TDD terminal Ui is similarly inactive 202 after the ninth time slot t 8 until the beginning of the first slot t 0 of a succeeding frame. Therefore, it can be seen that each TDD terminal is only actively handling communications traffic for 1/8 of the duration of the frame.
- communications traffic from FDD terminals occupy whole frames in the FDD bands of frequencies 108, 110 with instantaneously transmitting and receiving signals.
- TDD terminals U m+ ⁇ , ..., U n being idle during different periods of time depending upon the time slots to which they are allocated.
- variable data rates and packet oriented services associated with these applications and the limited amount of radio resources allocated to a given communications system make demands on the air interface and cellular architecture associated with the system.
- ETSI ETSI UMTS standard permits the use of macro-, micro- and pico-cells, where the macro cells ensure overall coverage of a geographic area and the micro-, or even pico-cells, support areas of high telecommunications traffic, for example, hotels or airports. Additionally, as mentioned above, the UMTS will support two duplex techniques, namely the FDD technique and the TDD technique.
- the term "system" is intended to include more than one communications system comprising at least one respective duplexing technique, or a single system comprising at least two duplexing techniques. It is therefore an object of the present invention to obviate, or at least mitigate the above-described problems caused by asymmetry of telecommunications traffic.
- a communications system comprising a first duplexing technique to enable communication between a first base station and a first plurality of terminals, a second duplexing technique to enable communication between a second base station and a second plurality of terminals, and frequency allocation means arranged to allocate at least a portion of a frequency band allocated to the first duplexing technique to a terminal so as to enable the terminal to operate in accordance with the second duplexing technique within the frequency band allocated to the first duplexing technique.
- a method of improving capacity in a communications system comprising a first duplexing technique to enable communication between a first base station and a first plurality of terminals, a second duplexing technique to enable communication between a second base station and a second plurality of terminals, the method comprising the steps of: allocating at least a portion of a frequency band allocated to the first duplexing technique to a terminal, and re-tuning the terminal so as to enable the terminal to operate in accordance with the second duplexing technique within the frequency band allocated to the first duplexing technique.
- a terminal for use in a system comprising a first duplexing technique to enable communication between a first base station and a first plurality of terminals, a second duplexing technique to enable communication between a second base station and a second plurality of terminals, the terminal being arranged to receive an allocation of at least a portion of a frequency band allocated to the first duplexing technique and to operate in accordance with the second duplexing technique within the frequency band allocated to the first duplexing technique.
- a base station for use in a system comprising a first duplexing technique to enable communication between another base station and a first plurality of terminals, the base station supporting a second duplexing technique for communications with a second plurality of terminals, and being arranged to allocate at least a portion of a frequency band allocated to the first duplexing technique to a terminal so as to enable the terminal to operate in accordance with the second duplexing technique within the frequency band allocated to the first duplexing technique.
- the capacity of the second base station can be increased by approximately 40% by converting unused radio resources of the first base station when the load on the first base station is approximately 30%. Due to an increase in spectral efficiency, it is also possible to maintain a large guard time and hence increase the radius of the cell supported by the second base station. The increased ' spectral efficiency results in higher data throughput and is achieved without filter adjustments to FDD terminals and base stations. Since minimal hardware and/or software modifications are necessary, the additional cost of implementing the present invention is minimal. Also, it is possible to assign different uplink and downlink capacities for a given terminal in the TDD cell, thereby obviating the need to change the switching point of the TDD cell. It is also asynchronous overlap with adjacent TDD cells is prevented.
- Figure 3 is a schematic diagram of a configuration of mobile terminals and have base stations constituting an example of the invention
- Figure 4 is a schematic diagram of bandwidth allocation for the example of Figure 3;
- Figure 5 shows, in more detail, the use of bandwidth allocated to a
- Figure 6 is a schematic diagram of bandwidth use constituting an embodiment of the invention.
- Figure 7 is a graph illustrating improved system performance due to the embodiment of Figure 6.
- a UMTS 300 ( Figure 3) comprises an FDD cell 302 supported by the FDD base station 106.
- a first TDD micro-cell 306, a second TDD micro-cell 308 and a third TDD micro- cell 310 are located substantially within the FDD cell 302 and are supported by a first TDD base station 116, a second TDD base station 314 and a third TDD base station 316, respectively.
- a plurality of FDD mobile terminals 318 are located within the FDD cell 302 and are in communication with the FDD base station 106 by means of a Radio Frequency (RF) interface.
- the plurality of FDD te ⁇ ninal 318 include the FDD terminal 104 described above.
- the first TDD base station 116 is located within the first TDD cell 306 and is in communication with a plurality of TDD mobile terminals Ui, ..., U n .
- the first TDD base station 116 is synchronised with the FDD base station 106 so that data frames are aligned.
- the FDD uplink band of frequencies 108 and the FDD downlink band of frequencies 110 form a paired band of frequencies.
- the FDD terminal 104 transmits uplink communications traffic to the FDD base station 106 using the uplink band of frequencies 108.
- the FDD terminal 104 receives transmissions from the FDD base station 106 via the downlink band of frequencies 110.
- the TDD technique uses the single band of frequencies 118 described above which serves both uplink and downlink communications traffic between, for example, the first TDD mobile terminal Ui and the first TDD base stations 116.
- the first TDD te ⁇ ninal Ui uplink transmissions take place during the first time slot to and downlink transmissions take place during the ninth time slot t 8 .
- a frequency allocation unit (FAU) 404 verifies that at least a portion
- the FDD uplink band of frequencies 108 is not being used for the transmission of FDD traffic and, using a Dynamic Channel Allocation (DC A) algorithm, determines which band of frequencies within the portion of the band of FDD uplink frequencies to use on the basis of mutual interference considerations.
- DC A Dynamic Channel Allocation
- the first TDD terminal Ui is instructed by the first TDD base station 116 to use one of the available uplink frequencies 400 allocated to the FDD technique for the transmission of uplink data, in time slots, according to the TDD technique.
- one of the available FDD uplink frequencies 402 is used by the first TDD base station 116 to transmit downlink data in time slots according to the TDD technique.
- a Time Division-Code Division Multiple Access (TD-CDMA) scheme is used by the first TDD base station 116 in order to provide multiple access to the plurality of TDD terminals Ui, ..., U n ; the FDD base station 106 employs a Wideband CDMA (W-CDMA) multiple access scheme.
- the first time slot t 0 is allocated to a set of the TDD terminals Ui, ..., U m for uplink traffic.
- the ninth time slot t 8 is allocated to the set of the TDD terminals Ui, ..., U m for downlink traffic.
- the uplink traffic and downlink traffic of the remaining mobile terminals Um + i,..., U n is transmitted during the remaining time slots t ⁇ ,...,t 7 and t 9 ,...,t ⁇ 5 .
- the first TDD base station 116 is arranged to transmit CDMA encoded data to the first TDD terminal Ui during the first timeslot t 0 .
- the FAU 404 monitors the band of FDD uplink frequencies 108 in order to determine whether or not there exists capacity in the band of FDD uplink frequencies 108, i.e.
- the first TDD base station 116 instructs the first TDD terminal Uj to re-tune to a frequency which are known to be available in the band of FDD uplink frequencies 108.
- the first TDD base station 116 then continues to transmit time slots of CDMA encoded data to the first TDD terminal Ui in the band of available frequencies.
- the available capacity 500 can be used by at least one of the TDD terminals Ui, ..., U m to transmit data whilst receiving data from the first TDD base station 116 (assuming the TDD terminal in question is capable of simultaneous transmission and reception). It should be appreciated that such dual functionality is not limited to the duration of the first time slot to and that such functionality can be provided whenever capacity is available within the uplink band of frequencies 108.
- the first TDD terminal Ui re-tunes to an appropriate frequency within the band of TDD frequencies 118 in order to transmit CDMA encoded data to the first TDD base station 116 during the ninth time slot t 8 .
- the dual functionality operation i.e. simultaneous transmission and reception, can take place during the ninth time slot t 8 , provided capacity is available within the uplink band of FDD frequencies 108.
- the FAU 404 again monitors the band of FDD uplink frequencies 108 in order to determine whether or not further available capacity exists within the band of FDD uplink frequencies
- the first TDD base station 116 instructs the first TDD terminal to re-tune to the available frequency 402 within the FDD uplink frequencies in order to continue transmitting TD-CDMA encoded data to the first TDD base station 116, the first TDD terminal Uj re-tuning to an appropriate frequency in the TDD band of frequencies 118 at a predetermined period of time prior to the commencement of the first time slot t 0 in a subsequent frame.
- the available capacity in the band of FDD uplink frequencies 108 can be used by the first TDD base station 116 to transmit further data to the first TDD terminal U .
- the available capacity in the band of FDD uplink frequencies 108 can be used by the first TDD base station 116 to receive further data from the first TDD terminal Uj.
- the additional capacity can be used to permit a new TDD terminals U n+ ⁇ to communicate with the first TDD base station 116. It should be appreciated that more than one new TDD terminal can be supported by the system provided the band of uplink frequencies 108 has sufficient capacity to support traffic from or to the more than one new TDD terminal.
- the use of the band of FDD uplink frequencies 108 by the new TDD terminal U n+ ⁇ or the use by existing TDD terminals Ui, ..., U n of the band of FDD uplink frequencies 108 can cause some additional interference within the band of FDD uplink frequencies.
- the additional interference will not greatly affect any FDD link.
- the DCA algorithm can be employed in order to select the band of frequencies which will result in the least mutual interference. In most cases, this will be the band of FDD uplink frequencies 108.
- a CDMA-TDD scheme is employed within the TDD band of the frequencies 118 ( Figure 6).
- CDMA-TDD scheme comprises a first time slot ts 0 and a second time slot tsi separated by a guard time t g .
- the guard time t g is provided in order to avoid collisions between transmitting and receiving time slots tso, tsi, because there is always a delay caused by signal propagation and signal processing; these delays are summarised and referred to as a round trip delay t rd .
- a terminal U m located at the boundary of the first TDD micro-cell 306 suffers from the greatest round trip delay t rd .
- the first TDD terminal Ui is assumed to be closer to the first TDD base station 116, resulting in less round tip delay t rd .
- the plurality of TDD terminals Ui, ..., U n transmit
- CDMA encoded data for the duration of the first time slot ts 0 .
- the FAU 404 monitors the band of FDD uplink frequencies
- the first TDD base station 116 permits the new TDD terminal U n+ ⁇ to communicate with the first TDD base station 116. After the first time slot ts 0 has expired, and if capacity still exists amongst the band of
- the first TDD base station 116 either permits the new TDD terminal U n+ ⁇ to continue transmitting or receiving data to/from the first TDD base station 116.
- the first TDD base station 116 permits one of the existing plurality of TDD terminals Ui, ..., U n , for example, the first TDD terminal U ! to re-tune to one of the available frequencies within the band of FDD uplink frequencies 108, and to continue receiving CDMA encoded data from the first TDD base station 116.
- the first TDD terminal Uior the new terminal U n+ ⁇ is to use available frequencies in the band of uplink frequencies 108, it is preferable, but not essential, for the first TDD terminal Ui or the new terminal U n+ ⁇ to transmit or receive packet oriented data.
- the transmission or reception of packet oriented data is preferable because the available capacity in the band of FDD frequencies 108 cannot be guaranteed at any time and so should be used for very low priority traffic which does not require a guaranteed response time.
- the first TDD terminal Ui re-tunes to the band of TDD frequencies 118 or in the case of the new user U n+ ⁇ , the new user U n+ ⁇ can enter a transmit mode in order to transmit data to the first TDD base station 116.
- the FAU 404 can be arranged to determine whether capacity exists within the band of FDD downlink frequencies 110 for use by the first TDD base station 116 and the plurality of TDD terminals affiliated thereto. Consequently, the first TDD base station 116 then either instructs an existing TDD terminal to re-tune to the available frequency or instructs the new TDD terminal U n+ ⁇ to use the available frequency 400, 402.
- this additional capacity can be shared between existing TDD terminals U ls ..., U ⁇ , or used for a single existing user, for example, by increasing the data rate of the first TDD terminals Ui by a factor of 15.
- Optimum results have been obtained in the above simulations when the TDD base station 116 is located between approximately 200 and 500m from the FDD base station 106.
- SDMA Frequency Division Multiple Access
- FDMA Frequency Division Multiple Access
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Bidirectional Digital Transmission (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99934842A EP1101379A1 (en) | 1998-07-25 | 1999-07-26 | Apparatus, method of and system for improving capacity in a communications network |
KR1020017001007A KR20010074747A (en) | 1998-07-25 | 1999-07-26 | Apparatus, method of and system for improving capacity in a communications network |
AU63120/99A AU750468B2 (en) | 1998-07-25 | 1999-07-26 | Apparatus, method of and system for improving capacity in a communications network |
JP2000563096A JP2002521988A (en) | 1998-07-25 | 1999-07-26 | Apparatus, method and system for improving communication network capacity |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9816207.6A GB9816207D0 (en) | 1998-07-25 | 1998-07-25 | Technique to improve through input in a cellular communication system |
GB9816207.6 | 1998-07-25 |
Publications (1)
Publication Number | Publication Date |
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WO2000007399A1 true WO2000007399A1 (en) | 2000-02-10 |
Family
ID=10836152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/002223 WO2000007399A1 (en) | 1998-07-25 | 1999-07-26 | Apparatus, method of and system for improving capacity in a communications network |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1101379A1 (en) |
JP (1) | JP2002521988A (en) |
KR (1) | KR20010074747A (en) |
CN (1) | CN1320342A (en) |
AU (1) | AU750468B2 (en) |
GB (1) | GB9816207D0 (en) |
WO (1) | WO2000007399A1 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1259092A2 (en) * | 2001-05-16 | 2002-11-20 | NTT DoCoMo, Inc. | Mobile communication systems |
GB2376602A (en) * | 2001-06-15 | 2002-12-18 | Motorola Inc | A method for providing a communications channel in Time Division Duplexing (TDD) mode between a TDD mobile and a TDD base station |
WO2004073210A1 (en) | 2003-02-11 | 2004-08-26 | Ipwireless, Inc. | Method, base station and mobile station for tdd operation in a communication system |
WO2004107606A1 (en) * | 2003-05-28 | 2004-12-09 | Ipwireless, Inc. | Method, base station and mobile station for tdd operation in a communication system |
KR100884956B1 (en) * | 2002-08-14 | 2009-02-23 | 엘지전자 주식회사 | Method and system for tansmitting/receiving asymmetric two-way packet data |
GB2457011A (en) * | 2008-01-18 | 2009-08-05 | Toshiba Res Europ Ltd | Duplexing communications to terminal classes in both time and frequency domains |
EP2146535A1 (en) * | 2008-07-15 | 2010-01-20 | Vodafone Group PLC | Method for optimizing downlink and uplink frequency carriers |
US7817592B2 (en) | 2004-02-11 | 2010-10-19 | Samsung Electronics Co., Ltd. | Method of operating a TDD/virtual FDD hierarchical cellular telecommunication system |
US7903619B2 (en) | 2003-07-31 | 2011-03-08 | Samsung Electronics Co., Ltd | Control system and multiple access method in wireless communication system |
WO2014005810A1 (en) * | 2012-07-05 | 2014-01-09 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for soft-cell operation involving legacy devices |
US8670438B2 (en) | 2008-03-31 | 2014-03-11 | Sharp Kabushiki Kaisha | Communication system, base station apparatus, and mobile station apparatus |
KR20170049514A (en) * | 2014-09-08 | 2017-05-10 | 퀄컴 인코포레이티드 | Flexible transmissions on one or more frequency division duplexing resources |
EP2884789B1 (en) * | 2012-08-13 | 2021-05-19 | Sony Corporation | Communication control device, terminal device, and communication control method |
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---|---|---|---|---|
KR100969749B1 (en) * | 2004-10-11 | 2010-07-13 | 삼성전자주식회사 | Resources allocation method in improved hybrid duplexing technology-based cellular communication system |
KR100856207B1 (en) * | 2005-09-13 | 2008-09-03 | 삼성전자주식회사 | Communication method and system for using time division duplex scheme and frequency division duplex scheme |
FR2900785A1 (en) * | 2006-05-02 | 2007-11-09 | Alcatel Sa | DEVICE AND METHOD FOR CONTROLLING FDD AND NON-FDD FREQUENCY BANDS USED TO ACCESS A FDD TRANSMITTER / RECEIVER USER TERMINAL TO A SERVICE THAT DOES NOT REQUIRE A RETURN PATH, A MOBILE NETWORK |
CN102026206B (en) * | 2009-09-21 | 2013-06-05 | 上海贝尔股份有限公司 | Method and device for allocating low frequency-band frequency spectrum resources for TDD system |
CN102300213B (en) * | 2010-06-28 | 2016-08-03 | 中兴通讯股份有限公司 | The method and device of spectral coordination is realized between TDD system and FDD system |
CN102572961B (en) * | 2010-12-07 | 2015-09-16 | 中兴通讯股份有限公司 | The method of micro cell deployment WAP (wireless access point) channel and device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5732076A (en) * | 1995-10-26 | 1998-03-24 | Omnipoint Corporation | Coexisting communication systems |
-
1998
- 1998-07-25 GB GBGB9816207.6A patent/GB9816207D0/en not_active Ceased
-
1999
- 1999-07-26 WO PCT/GB1999/002223 patent/WO2000007399A1/en not_active Application Discontinuation
- 1999-07-26 KR KR1020017001007A patent/KR20010074747A/en not_active Application Discontinuation
- 1999-07-26 AU AU63120/99A patent/AU750468B2/en not_active Ceased
- 1999-07-26 JP JP2000563096A patent/JP2002521988A/en active Pending
- 1999-07-26 EP EP99934842A patent/EP1101379A1/en not_active Withdrawn
- 1999-07-26 CN CN99811403A patent/CN1320342A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5732076A (en) * | 1995-10-26 | 1998-03-24 | Omnipoint Corporation | Coexisting communication systems |
Non-Patent Citations (1)
Title |
---|
POVEY: "Hybrid FDD/TDD-CDMA for third generation cellular systems", IEE COLLOQUIUM ON CDMA TECHNIQUES AND APPLICATIONS FOR THIRD GENERATION MOBILE SYSTEMS, 19 May 1997 (1997-05-19), pages 1 - 6, XP002078478 * |
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EP1259092A3 (en) * | 2001-05-16 | 2003-08-13 | NTT DoCoMo, Inc. | Mobile communication systems |
EP1259092A2 (en) * | 2001-05-16 | 2002-11-20 | NTT DoCoMo, Inc. | Mobile communication systems |
US7502596B2 (en) | 2001-05-16 | 2009-03-10 | Ntt Docomo, Inc. | Mobile communication systems |
GB2376602A (en) * | 2001-06-15 | 2002-12-18 | Motorola Inc | A method for providing a communications channel in Time Division Duplexing (TDD) mode between a TDD mobile and a TDD base station |
GB2376602B (en) * | 2001-06-15 | 2003-06-18 | Motorola Inc | A method for providing a communication channel in time division duplexing (TDD) mode between a TDD mobile and a TDD base station |
KR100884956B1 (en) * | 2002-08-14 | 2009-02-23 | 엘지전자 주식회사 | Method and system for tansmitting/receiving asymmetric two-way packet data |
US8797925B2 (en) | 2003-02-11 | 2014-08-05 | Sony Corporation | Method, base station and mobile station for TDD operation in a communication system |
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US7817592B2 (en) | 2004-02-11 | 2010-10-19 | Samsung Electronics Co., Ltd. | Method of operating a TDD/virtual FDD hierarchical cellular telecommunication system |
GB2457011B (en) * | 2008-01-18 | 2010-09-29 | Toshiba Res Europ Ltd | Wireless communications apparatus |
GB2457011A (en) * | 2008-01-18 | 2009-08-05 | Toshiba Res Europ Ltd | Duplexing communications to terminal classes in both time and frequency domains |
US8670438B2 (en) | 2008-03-31 | 2014-03-11 | Sharp Kabushiki Kaisha | Communication system, base station apparatus, and mobile station apparatus |
EP2146535A1 (en) * | 2008-07-15 | 2010-01-20 | Vodafone Group PLC | Method for optimizing downlink and uplink frequency carriers |
WO2014005810A1 (en) * | 2012-07-05 | 2014-01-09 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for soft-cell operation involving legacy devices |
US9300395B2 (en) | 2012-07-05 | 2016-03-29 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for carrier aggregation |
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EP3192293A4 (en) * | 2014-09-08 | 2018-05-02 | Qualcomm Incorporated | Flexible transmissions on one or more frequency division duplexing resources |
US11139931B2 (en) | 2014-09-08 | 2021-10-05 | Qualcomm Incorporated | Flexible transmissions on one or more frequency division duplexing resources |
KR102355387B1 (en) * | 2014-09-08 | 2022-01-24 | 퀄컴 인코포레이티드 | Flexible transmissions on one or more frequency division duplexing resources |
Also Published As
Publication number | Publication date |
---|---|
AU750468B2 (en) | 2002-07-18 |
EP1101379A1 (en) | 2001-05-23 |
CN1320342A (en) | 2001-10-31 |
GB9816207D0 (en) | 1998-09-23 |
KR20010074747A (en) | 2001-08-09 |
JP2002521988A (en) | 2002-07-16 |
AU6312099A (en) | 2000-02-21 |
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