WO2011071554A1 - Systèmes et procédés destinés à permettre une réutilisation de fréquence fractionnaire dans des systèmes td-scdma - Google Patents

Systèmes et procédés destinés à permettre une réutilisation de fréquence fractionnaire dans des systèmes td-scdma Download PDF

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Publication number
WO2011071554A1
WO2011071554A1 PCT/US2010/029525 US2010029525W WO2011071554A1 WO 2011071554 A1 WO2011071554 A1 WO 2011071554A1 US 2010029525 W US2010029525 W US 2010029525W WO 2011071554 A1 WO2011071554 A1 WO 2011071554A1
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WIPO (PCT)
Prior art keywords
cell
time slot
ues
allocating
parameter
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PCT/US2010/029525
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English (en)
Inventor
Tom Chin
Guangming Shi
Kuo-Chun Lee
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Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to CN201080000802.2A priority Critical patent/CN102318393B/zh
Priority to TW099110803A priority patent/TW201130355A/zh
Publication of WO2011071554A1 publication Critical patent/WO2011071554A1/fr

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    • 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
    • H04W16/24—Cell structures
    • H04W16/30—Special cell shapes, e.g. doughnuts or ring cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties

Definitions

  • Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to systems and methods for allowing fractional frequency reuse in Time Division Synchronous Code Division Multiple Access (TD- SCDMA) systems.
  • TD- SCDMA Time Division Synchronous Code Division Multiple Access
  • Wireless communication networks are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on.
  • Such networks which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • UTRAN Universal Terrestrial Radio Access Network
  • the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3 GPP).
  • UMTS Universal Mobile Telecommunications System
  • 3 GPP 3rd Generation Partnership Project
  • the UMTS which is the successor to Global System for Mobile Communications (GSM) technologies, currently supports various air interface standards, such as Wideband-Code Division Multiple Access (W-CDMA), Time Division-Code Division Multiple Access (TD-CDMA), and Time Division-Synchronous Code Division Multiple Access (TD- SCDMA).
  • W-CDMA Wideband-Code Division Multiple Access
  • TD-CDMA Time Division-Code Division Multiple Access
  • TD- SCDMA Time Division-Synchronous Code Division Multiple Access
  • the UMTS also supports enhanced 3G data communications protocols, such as High Speed Downlink Packet Data (HSDPA), which provides higher data transfer speeds and capacity to associated UMTS networks.
  • HSDPA High Speed Downlink Packet Data
  • a method for allocating resources in a wireless communications network generally includes allocating at least a first time slot of a subframe for use by a first set of user equipment devices (UEs) in an inner region of a first cell and allocating at least a second time slot of the same subframe for use by a second set of UEs in an outer region of the first cell.
  • UEs user equipment devices
  • an apparatus for allocating resources in a wireless communications network generally includes at least one processor and a memory coupled to the at least one processor.
  • the at least one processor is typically configured to allocate at least a first time slot of a subframe for use by a first set of UEs in an inner region of a first cell and to allocate at least a second time slot of the same subframe for use by a second set of UEs in an outer region of the first cell.
  • an apparatus for allocating resources in a wireless communications network generally includes means for allocating at least a first time slot of a subframe for use by a first set of UEs in an inner region of a first cell and means for allocating at least a second time slot of the same subframe for use by a second set of UEs in an outer region of the first cell.
  • a computer-program product for allocating resources in a wireless communications network generally includes a computer-readable medium having code for allocating at least a first time slot of a subframe for use by a first set of UEs in an inner region of a first cell and allocating at least a second time slot of the same subframe for use by a second set of UEs in an outer region of the first cell.
  • a method for allocating resources in a wireless communications network is provided.
  • the method generally includes transmitting a parameter indicative of a distance of a UE from a Node B, receiving a first allocation of at least a first time slot of a subframe for use when the parameter indicates the UE is in an inner region of a first cell, and receiving a second allocation of at least a second time slot of the same subframe for use when the parameter indicates the UE is in an outer region of the first cell.
  • an apparatus for allocating resources in a wireless communications network generally includes at least one processor and a memory coupled to the at least one processor.
  • the at least one processor is typically configured to transmit a parameter indicative of a distance of a UE from a Node B, to receive a first allocation of at least a first time slot of a subframe for use when the parameter indicates the UE is in an inner region of a first cell, and to receive a second allocation of at least a second time slot of the same subframe for use when the parameter indicates the UE is in an outer region of the first cell.
  • an apparatus for allocating resources in a wireless communications network generally includes means for transmitting a parameter indicative of a distance of a UE from a Node B, means for receiving a first allocation of at least a first time slot of a subframe for use when the parameter indicates the UE is in an inner region of a first cell, and means for receiving a second allocation of at least a second time slot of the same subframe for use when the parameter indicates the UE is in an outer region of the first cell.
  • a computer-program product for allocating resources in a wireless communications network.
  • the computer-program product generally includes a computer-readable medium having code for transmitting a parameter indicative of a distance of a UE from a Node B, receiving a first allocation of at least a first time slot of a subframe for use when the parameter indicates the UE is in an inner region of a first cell, and receiving a second allocation of at least a second time slot of the same subframe for use when the parameter indicates the UE is in an outer region of the first cell.
  • FIG. 1 is a block diagram conceptually illustrating an example of a telecommunications system in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating an example of a frame structure in a telecommunications system in accordance with certain aspects of the present disclosure.
  • FIG. 3 is a block diagram conceptually illustrating an example of a Node B in communication with a user equipment device (UE) in a telecommunications system in accordance with certain aspects of the present disclosure.
  • UE user equipment device
  • FIG. 4 illustrates an example Time Division Synchronous Code Division Multiple Access (TD-SCDMA) frame structure in accordance with certain aspects of the present disclosure.
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • FIG. 5 illustrates an arrangement of adjacent Node Bs in accordance with certain aspects of the present disclosure.
  • FIGs. 6-8 illustrate example resource allocations in accordance with certain aspects of the present disclosure.
  • FIG. 9 illustrates an example measurement reporting parameter in accordance with certain aspects of the present disclosure.
  • FIGs. 10A and 10B illustrate example call flows between a UE and a Node B in accordance with certain aspects of the present disclosure.
  • FIG. 11 is a functional block diagram conceptually illustrating example blocks executed to allocate resources in a wireless communications network, from the perspective of a Node B, in accordance with certain aspects of the present disclosure.
  • FIG. 12 is a functional block diagram conceptually illustrating example blocks executed to receive allocated resources in a wireless communications network, from the perspective of a UE, in accordance with certain aspects of the present disclosure.
  • FIG. 1 a block diagram is shown illustrating an example of a telecommunications system 100.
  • the various concepts presented throughout this disclosure may be implemented across a broad variety of telecommunication systems, network architectures, and communication standards.
  • the aspects of the present disclosure illustrated in FIG. 1 are presented with reference to a UMTS system employing a TD-SCDMA standard.
  • the UMTS system includes a radio access network (RAN) 102 (e.g., UTRAN) that provides various wireless services including telephony, video, data, messaging, broadcasts, and/or other services.
  • RAN radio access network
  • the RAN 102 may be divided into a number of Radio Network Subsystems (RNSs) such as an RNS 107, each controlled by a Radio Network Controller (RNC) such as an RNC 106.
  • RNC Radio Network Controller
  • the RNC 106 is an apparatus responsible for, among other things, assigning, reconfiguring and releasing radio resources within the RNS 107.
  • the RNC 106 may be interconnected to other RNCs (not shown) in the RAN 102 through various types of interfaces such as a direct physical connection, a virtual network, or the like, using any suitable transport network.
  • the geographic region covered by the RNS 107 may be divided into a number of cells, with a radio transceiver apparatus serving each cell.
  • a radio transceiver apparatus is commonly referred to as a Node B in UMTS applications, but may also be referred to by those skilled in the art as a base station (BS), a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), or some other suitable terminology.
  • BS basic service set
  • ESS extended service set
  • AP access point
  • two Node Bs 108 are shown; however, the RNS 107 may include any number of wireless Node Bs.
  • the Node Bs 108 provide wireless access points to a core network 104 for any number of mobile apparatuses.
  • a mobile apparatus include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a notebook, a netbook, a smartbook, a personal digital assistant (PDA), a satellite radio, a global positioning system (GPS) device, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • GPS global positioning system
  • multimedia device e.g., a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • MP3 player digital audio player
  • the mobile apparatus is commonly referred to as user equipment (UE) in UMTS applications, but may also be referred to by those skilled in the art as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • UE user equipment
  • MS mobile station
  • AT access terminal
  • three UEs 110 are shown in communication with the Node Bs 108.
  • the downlink (DL), also called the forward link refers to the communication link from a Node B to a UE
  • the uplink (UL) also called the reverse link
  • the core network 104 includes a GSM core network.
  • GSM Global System for Mobile communications
  • the various concepts presented throughout this disclosure may be implemented in a RAN, or other suitable access network, to provide UEs with access to types of core networks other than GSM networks.
  • the core network 104 supports circuit-switched services with a mobile switching center (MSC) 112 and a gateway MSC (GMSC) 114.
  • MSC mobile switching center
  • GMSC gateway MSC
  • One or more RNCs such as the RNC 106, may be connected to the MSC 112.
  • the MSC 112 is an apparatus that controls call setup, call routing, and UE mobility functions.
  • the MSC 112 also includes a visitor location register (VLR) (not shown) that contains subscriber- related information for the duration that a UE is in the coverage area of the MSC 112.
  • VLR visitor location register
  • the GMSC 114 provides a gateway through the MSC 112 for the UE to access a circuit- switched network 116.
  • the GMSC 114 includes a home location register (HLR) (not shown) containing subscriber data, such as the data reflecting the details of the services to which a particular user has subscribed.
  • HLR home location register
  • the HLR is also associated with an authentication center (AuC) that contains subscriber-specific authentication data.
  • AuC authentication center
  • the core network 104 also supports packet-data services with a serving GPRS support node (SGSN) 118 and a gateway GPRS support node (GGSN) 120.
  • GPRS which stands for General Packet Radio Service, is designed to provide packet- data services at speeds higher than those available with standard GSM circuit-switched data services.
  • the GGSN 120 provides a connection for the RAN 102 to a packet-based network 122.
  • the packet-based network 122 may be the Internet, a private data network, or some other suitable packet-based network.
  • the primary function of the GGSN 120 is to provide the UEs 110 with packet-based network connectivity. Data packets are transferred between the GGSN 120 and the UEs 110 through the SGSN 118, which performs primarily the same functions in the packet-based domain as the MSC 112 performs in the circuit-switched domain.
  • the UMTS air interface is a spread spectrum Direct-Sequence Code Division Multiple Access (DS-CDMA) system.
  • DS-CDMA Spread spectrum Direct-Sequence Code Division Multiple Access
  • the TD-SCDMA standard is based on such direct sequence spread spectrum technology and additionally calls for a time division duplexing (TDD), rather than a frequency division duplexing (FDD) as used in many FDD mode UMTS/W-CDMA systems.
  • TDD uses the same carrier frequency for both the uplink (UL) and downlink (DL) between a Node B 108 and a UE 110, but divides uplink and downlink transmissions into different time slots in the carrier.
  • FIG. 2 shows a frame structure 200 for a TD-SCDMA carrier.
  • the TD- SCDMA carrier as illustrated, has a frame 202 that is 10 ms in length.
  • the frame 202 has two 5 ms subframes 204, and each of the subframes 204 includes seven time slots, TS0 through TS6.
  • the first time slot, TS0 is usually allocated for downlink communication
  • the second time slot, TS1 is usually allocated for uplink communication.
  • the remaining time slots, TS2 through TS6 may be used for either uplink or downlink, which allows for greater flexibility during times of higher data transmission times in either the uplink or downlink directions.
  • a downlink pilot time slot (DwPTS) 206, a guard period (GP) 208, and an uplink pilot time slot (UpPTS) 210 are located between TS0 and TS1.
  • Each time slot, TS0-TS6, may allow data transmission multiplexed on a maximum of 16 code channels.
  • Data transmission on a code channel includes two data portions 212 separated by a midamble 214 and followed by a guard period (GP) 216.
  • the midamble 214 may be used for features, such as channel estimation, while the GP 216 may be used to avoid inter-burst interference.
  • FIG. 3 is a block diagram of a Node B 310 in communication with a UE 350 in a RAN 300, where the RAN 300 may be the RAN 102 in FIG. 1, the Node B 310 may be the Node B 108 in FIG. 1, and the UE 350 may be the UE 110 in FIG. 1.
  • a transmit processor 320 may receive data from a data source 312 and control signals from a controller/processor 340. The transmit processor 320 provides various signal processing functions for the data and control signals, as well as reference signals (e.g., pilot signals).
  • the transmit processor 320 may provide cyclic redundancy check (CRC) codes for error detection, coding and interleaving to facilitate forward error correction (FEC), mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M- quadrature amplitude modulation (M-QAM), and the like), spreading with orthogonal variable spreading factors (OVSF), and multiplying with scrambling codes to produce a series of symbols.
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M- quadrature amplitude modulation
  • OVSF orthogonal variable spreading factors
  • These channel estimates may be derived from a reference signal transmitted by the UE 350 or from feedback contained in the midamble 214 (FIG. 2) from the UE 350.
  • the symbols generated by the transmit processor 320 are provided to a transmit frame processor 330 to create a frame structure.
  • the transmit frame processor 330 creates this frame structure by multiplexing the symbols with a midamble 214 (FIG. 2) from the controller/processor 340, resulting in a series of frames.
  • the frames are then provided to a transmitter 332, which provides various signal conditioning functions including amplifying, filtering, and modulating the frames onto a carrier for downlink transmission over the wireless medium through smart antennas 334.
  • the smart antennas 334 may be implemented with beam steering bidirectional adaptive antenna arrays or other similar beam technologies.
  • a receiver 354 receives the downlink transmission through an antenna 352 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 354 is provided to a receive frame processor 360, which parses each frame, and provides the midamble 214 (FIG. 2) to a channel processor 394 and the data, control, and reference signals to a receive processor 370.
  • the receive processor 370 then performs the inverse of the processing performed by the transmit processor 320 in the Node B 310. More specifically, the receive processor 370 descrambles and despreads the symbols, and then determines the most likely signal constellation points transmitted by the Node B 310 based on the modulation scheme.
  • the soft decisions may be based on channel estimates computed by the channel processor 394.
  • the soft decisions are then decoded and deinterleaved to recover the data, control, and reference signals.
  • the CRC codes are then checked to determine whether the frames were successfully decoded.
  • the data carried by the successfully decoded frames will then be provided to a data sink 372, which represents applications running in the UE 350 and/or various user interfaces (e.g., display).
  • Control signals carried by successfully decoded frames will be provided to a controller/processor 390.
  • the controller/processor 390 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • a transmit processor 380 receives data from a data source 378 and control signals from the controller/processor 390 and provides various signal processing functions including CRC codes, coding and interleaving to facilitate FEC, mapping to signal constellations, spreading with OVSFs, and scrambling to produce a series of symbols.
  • Channel estimates may be used to select the appropriate coding, modulation, spreading, and/or scrambling schemes.
  • the symbols produced by the transmit processor 380 will be provided to a transmit frame processor 382 to create a frame structure.
  • the transmit frame processor 382 creates this frame structure by multiplexing the symbols with a midamble 214 (FIG. 2) from the controller/processor 390, resulting in a series of frames.
  • the frames are then provided to a transmitter 356, which provides various signal conditioning functions including amplification, filtering, and modulating the frames onto a carrier for uplink transmission over the wireless medium through the antenna 352.
  • the uplink transmission is processed at the Node B 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • a receiver 335 receives the uplink transmission through the antenna 334 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 335 is provided to a receive frame processor 336, which parses each frame, and provides the midamble 214 (FIG. 2) to the channel processor 344 and the data, control, and reference signals to a receive processor 338.
  • the receive processor 338 performs the inverse of the processing performed by the transmit processor 380 in the UE 350.
  • the data and control signals carried by the successfully decoded frames may then be provided to a data sink 339 and the controller/processor, respectively.
  • the controller/processor 340 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the controller/processors 340 and 390 may be used to direct the operation at the Node B 310 and the UE 350, respectively.
  • the controller/processors 340 and 390 may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the computer- readable media of memories 342 and 392 may store data and software for the Node B 310 and the UE 350, respectively.
  • a scheduler/processor 346 at the Node B 310 may be used to allocate resources to the UEs and schedule downlink and/or uplink transmissions for the UEs.
  • FIG. 4 illustrates an example Time Division Synchronous Code Division Multiple Access (TD-SCDMA) frame 400 in accordance with certain aspects of the present disclosure.
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the TD- SCDMA frame 400 may, for example, comprise a 10 ms frame subdivided into two 5 ms sub frames 204.
  • Each of the subframes 204 may comprise seven traffic timeslots (TSs) 420 for uplink (UL) and downlink (DL) communications.
  • TD-SCDMA is based on time division and code division to allow multiple UEs to share the same radio bandwidth.
  • the downlink and uplink transmissions share the same bandwidth in different TSs.
  • TSO is allocated for system overhead channels (e.g., P-CCPCH, S-CCPCH, PICH, etc.), and TS1 - T6 are allocated for traffic channels (e.g., DPCH, HS-PDSCH, E-PUCH).
  • system overhead channels e.g., P-CCPCH, S-CCPCH, PICH, etc.
  • TS1 - T6 are allocated for traffic channels (e.g., DPCH, HS-PDSCH, E-PUCH).
  • TSO may be assigned for downlink and may convey control messages, such as the broadcast channel (BCH), while TS1 may be allocated for uplink.
  • BCH broadcast channel
  • each subframe 204 there may exist two switching points (transitions from uplink to downlink and vice versa) that separate the uplink and the downlink.
  • a first switching point may be located at the guard period (GP) 208 between the Downlink Pilot Timeslot (DwPTS) 206 and the Uplink Pilot Timeslot (UpPTS) 210.
  • a second switching point may occur anywhere between the end of TS1 and the end of TS6. The second switching point may determine the traffic nature of a particular subframe, which may be symmetric or asymmetric. In the asymmetric mode, at least one uplink timeslot and one downlink timeslot may be allocated for traffic.
  • the DwPTS 206, GP 208, and UpPTS 210 may be located between the TS0 and TS1 whatever the level of asymmetry may be.
  • the DwPTS 206 may be utilized for downlink synchronization.
  • the GP 208 may determine a maximum cell size.
  • the UpPTS 210 may be used by the Node B to determine a received power level and a received timing from the UE.
  • each of the timeslots 420 may comprise two data fields 212.
  • a midamble 214 may be located between these two data fields 212 and utilized as a training sequence for channel estimation, power measurements, and synchronization.
  • HS-PDSCH High-Speed Physical Downlink Shared Channel
  • HS-SCCH High-Speed Shared Control Channel
  • HARQ Hybrid Automatic Repeat request
  • E-DCH Enhanced Dedicated Channel
  • E-PUCH Physical Uplink Channel
  • E-RUCCH E-DCH Random Access Uplink Control Channel
  • E-AGCH E-DCH Absolute Grant Channel
  • E- HICH E-DCH Hybrid ARQ Acknowledgement Indicator Channel
  • FIG. 5 illustrates an example arrangement of cells belonging to adjacent Node Bs. Each cell may have an inner portion 502 near the Node B. Each cell may also have an outer portion 504, also referred to as a cell edge.
  • the downlink (DL) or uplink (UL) interference may increase as compared to when the UE is located near the Node B (e.g., in the inner portion 502).
  • the interference is typically due to overlapping signals from neighbor cells.
  • FEC Forward Error Correction
  • the frequency Fl may be used, but in the outer portions 504 of the cell, the frequency may be reused with spatial reuse factor > 1 (e.g., one cell may use F3 in its outer portion 502, while another adjacent cell may use F2 in its outer portion 502).
  • Such fractional frequency reuse may reduce the interference at the cell edge.
  • An additional benefit is that the success rate of hard handover may increase due to improved SINR (signal-to-interference-and-noise ratio). This can be beneficial to systems, such as TD-SCDMA, which rely on hard handover and baton handover.
  • SINR signal-to-interference-and-noise ratio
  • the inner regions of the cells may most likely not interfere, so identical time slots and/or frequencies may be used for these inner regions. Power may be adjusted to ensure the inner cells do not interfere.
  • the outer regions of the cells should probably not share identical time slots and frequencies. In other words, the outer cells may most likely be allocated to different time slots and/or different frequencies.
  • FIG. 6 illustrates a case where there is only one frequency.
  • cell 1 is allocated with TSO for system overhead channels, TSl and TS4 for inner region 602 operation of traffic channels, and TS3 and TS6 for outer region 604 operation of traffic channels.
  • FIG. 7 illustrates an example allocation for three frequency carriers.
  • Each of cells 1, 2, and 3 may have the following common allocation: TSO of all three frequencies for system overhead channels and TSl, TS2, TS4, and TS5 of all three frequencies for inner region 702 operation of traffic channels.
  • each of cells 1, 2, and 3 has a different allocation for outer region operations.
  • Cell 1 may be allocated with TS3 and TS6 of frequency 1 for outer region 704 operations of traffic channels.
  • Cell 2 may be allocated with TS3 and TS6 of frequency 2 for outer region 706 operations of traffic channels.
  • Cell 3 may be allocated with TS3 and TS6 of frequency 3 for outer region 708 operations of traffic channels.
  • time slots for the same frequencies across cells. So long as the outer portions of the cells do not share identical time slots with identical frequencies (except for overhead signals), interference between neighboring cells may be eliminated.
  • Each of cells 1, 2, and 3 may have the following common allocation: TSO for system overhead channels and TSl and TS4 of all three frequencies for inner cell 802 operations of traffic channels.
  • Cell 1 may be allocated with TS2, TS3, TS5, and TS6 of frequency 1 for outer region 804 operations of traffic channels.
  • Cell 2 may be allocated with TS2, TS3, TS5, and TS6 of frequency 2 for outer region 806 operations of traffic channels.
  • Cell 3 may be allocated with TS2, TS3, TS5, and TS6 of frequency 3 for outer region 808 operations of traffic channels.
  • resources may be allocated dynamically, depending on resource demands in inner cell regions compared to outer cell regions. For example, if there are many UEs communicating in outer regions and relatively few UEs communicating in inner regions, resource allocation may make more time slots and/or frequencies available for use in these outer regions. An example of allocation that may favor outer cell region usage is shown in FIG. 8. Similarly, if there are many UEs communicating in inner regions and relatively few UEs communicating in outer regions, resource allocation may make more time slots and/or frequencies available for use in these inner regions. An example of allocation that may favor inner cell region usage is shown in FIG. 7. According to certain aspects, if the relative numbers of UEs operating in inner regions compared to UEs operating in outer regions significantly changes, resource allocation may be changed so that increased time slots and/or frequencies are made available where needed.
  • the network may allocate different resources (i.e., the UE may switch to the allocated time slots and/or frequencies for either the inner region or the outer region, as the case may be).
  • the UE may be commanded by the network to provide some internal measurement report, with the following report quantity or other parameter: TA D V, which is the time advance defined by the time difference of T X - ⁇ .
  • FIG. 9 shows this parameter.
  • T X 902 is calculated from the beginning time of the first uplink time slot in the first subframe used by the UE with the UE timing according to the reception of start of a certain downlink time slot.
  • ⁇ 904 is calculated from the time of the beginning of the same uplink time slot by the UE. For example, if the UE is perfectly synchronized in UL transmission, TADV 906 is essentially the round trip delay (RTD) from the Node B, proportional to the distance to the Node B.
  • RTD round trip delay
  • a specific parameter T H may be designated as the threshold to detect whether the UE is in the inner cell region or the outer cell region.
  • the UE may be configured to report the TA D V measurement. For example, the UE may be configured to report when TADV > T H (i.e., UE crossing from inner cell region to outer cell region). The UE may also be configured to report when TADV ⁇ T H (i.e., UE crossing from outer cell region to inner cell region).
  • FIG. 10A illustrates an example exchange between the Node B and UE according to certain aspects of the present disclosure.
  • the Node B may reconfigure the DPCH (Dedicated Physical Channel) using the PHYSCIAL CHANNEL RECONFIGURATION message or RADIO BEARER RECONFIGURATION signal 1008 in an effort to re-allocate the corresponding resource of frequency spatial reuse factor.
  • the UE may then acknowledge completion of the resource reallocation with signal 1010. Communications 1012 may be then exchanged on the reallocated time and/or frequency resources.
  • FIG. 10B illustrates another example exchange between the Node B and UE according to certain aspects of the present disclosure.
  • the UE may operate with HSDPA, or in other words, the UE is receiving DL high speed data bursts on HS- PDSCH (High-Speed Physical Downlink Shared Channel) 1016.
  • the UE may operate with HSUPA, i.e., the UE is transmitting high speed UL data bursts on E-PUCH (Enhanced dedicated channel Physical Uplink Channel) 1018.
  • E-PUCH Enhanced dedicated channel Physical Uplink Channel
  • HS-SCCH High-Speed Shared Control Channel
  • E-AGCH Enhanced dedicated channel Absolute Grant Channel
  • frequency spatial reuse is provided for the time slot/frequency resource allocation so that the cell edge performance can improve and enhance the handover performance in TD-SCDMA systems.
  • FIG. 11 is a functional block diagram conceptually illustrating example blocks 1100 executed to allocate resources in a wireless communications network, from the perspective of a Node B, for example. Operations illustrated by the blocks 1100 may be executed, for example, at the processor(s) 346 and/or 340 of the Node B 310 from FIG. 3.
  • the Node B may allocate at least a first time slot of a subframe for shared use by a first set of UEs in an inner region of a first cell at block 1102.
  • the Node B may allocate at least a second time slot of the same subframe for use by a second set of UEs in an outer region of the first cell.
  • the Node B at block 1106 may optionally allocate the at least the first time slot of the subframe for use by a third set of UEs in an inner region of a second cell.
  • the Node B may optionally allocate at least a third time slot of the same subframe for use by a fourth set of UEs in an outer region of the second cell.
  • the Node B may transmit the subframe with the allocated time slots.
  • FIG. 12 is a functional block diagram conceptually illustrating example blocks 1200 executed to receive allocations of resources in a wireless communications network, from the perspective of a UE, for example.
  • Operations illustrated by the blocks 1200 may be executed, for example, at the transmitter 356, the receiver 354, and the antenna 352 of the UE 350 from FIG. 3.
  • the operations may begin at block 1202 by transmitting a parameter indicative of a distance of a UE from a Node B.
  • the parameter may comprise a time advance (T A D V ) measurement.
  • the UE may receive a first allocation of at least a first time slot of a subframe for use when the parameter indicates the UE is in an inner region of a first cell.
  • the UE may receive, at block 1206, a second allocation of at least a second time slot of the same subframe for use when the parameter indicates the UE is in an outer region of the first cell.
  • the UE may receive the first allocation of at least the first time slot of the same subframe for use when the parameter indicates the UE is in an inner region of a second cell.
  • the UE may receive, at block 1210, a third allocation of at least a third time slot of the same subframe when the parameter indicates the UE is in an outer region of the second cell.
  • Certain aspects utilizing the operations presented in FIGs. 11 and 12 may include further operations.
  • such further operations may include reallocating at least a time slot of the same subframe for use by a UE when the UE moves between an inner region and an outer region of a cell, which may be determined by distance from the Node B.
  • further operations may include configuring the UE to report a parameter for determining distance.
  • the parameter reported may be T A D V .
  • time slots and/or frequencies may be allocated dynamically based on the number of UEs communicating in the inner region of the first cell compared to the number of UEs communicating in the outer region of the first cell.
  • the apparatus for wireless communication includes means for allocating at least a first time slot of a subframe for use by a first set of UEs in an inner region of a first cell and means for allocating at least a second time slot of the same subframe for use by a second set of UEs in an outer region of the first cell.
  • the aforementioned means may be the scheduler/processor 346 or the controller/processor 340 configured to perform the functions recited by the aforementioned means.
  • the aforementioned means may be a module or any apparatus configured to perform the functions recited by the aforementioned means.
  • the apparatus for wireless communication includes means for transmitting a parameter indicative of a distance of a UE from a Node B, means for receiving an allocation of at least a first time slot of a subframe for use when the parameter indicates the UE is in an inner region of a first cell, and means for receiving a second allocation of at least a second time slot of the same subframe for use when the parameter indicates the UE is in an outer region of the first cell.
  • the aforementioned means may be the transmitter 356, the receiver 354, and the antenna 352 configured to perform the functions recited by the aforementioned means.
  • the aforementioned means may be a module or any apparatus configured to perform the functions recited by the aforementioned means.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA2000 Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Ultra- Wideband
  • Bluetooth Bluetooth
  • the actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.
  • processors have been described in connection with various apparatuses and methods. These processors may be implemented using electronic hardware, computer software, or any combination thereof. Whether such processors are implemented as hardware or software will depend upon the particular application and overall design constraints imposed on the system.
  • a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with a microprocessor, microcontroller, digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gated logic, discrete hardware circuits, and other suitable processing components configured to perform the various functions described throughout this disclosure.
  • DSP digital signal processor
  • FPGA field-programmable gate array
  • PLD programmable logic device
  • the functionality of a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with software being executed by a microprocessor, microcontroller, DSP, or other suitable platform.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the software may reside on a computer-readable medium.
  • a computer- readable medium may include, by way of example, memory such as a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., compact disc (CD), digital versatile disc (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), random access memory (RAM), read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), a register, or a removable disk.
  • memory is shown separate from the processors in the various aspects presented throughout this disclosure, the memory may be internal to the processors (e.g., cache or register).
  • Computer-readable media may be embodied in a computer-program product.
  • a computer-program product may include a computer-readable medium in packaging materials.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Certains aspects de la présente description fournissent un procédé d'attribution de ressources dans un réseau de communications sans fil. Le procédé comprend de manière générale les étapes consistant à : attribuer au moins une première tranche de temps d'une sous-trame pour une utilisation par un premier ensemble de dispositifs de matériels utilisateurs (UE) dans une région intérieure d'une première cellule ; et à attribuer au moins une deuxième tranche de temps de la même sous-trame pour une utilisation par un deuxième ensemble d'UE dans une région extérieure de la première cellule. Selon certains aspects, le procédé peut également comprendre les étapes consistant à : attribuer la ou les premières tranches de temps de la sous-trame pour une utilisation par un troisième ensemble d'UE dans une région intérieure d'une deuxième cellule ; et à attribuer au moins une troisième tranche de temps de la même sous-trame pour une utilisation par un quatrième ensemble d'UE dans une région extérieure de la deuxième cellule.
PCT/US2010/029525 2009-12-11 2010-03-31 Systèmes et procédés destinés à permettre une réutilisation de fréquence fractionnaire dans des systèmes td-scdma WO2011071554A1 (fr)

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TW099110803A TW201130355A (en) 2009-12-11 2010-04-07 Systems and methods to allow fractional frequency reuse in TD-SCDMA systems

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015038996A1 (fr) * 2013-09-16 2015-03-19 Qualcomm Incorporated Réutilisation de fréquence fractionnaire sur la base de la mobilité
EP3133853A1 (fr) * 2014-04-14 2017-02-22 China Academy of Telecommunications Technology Procédé et appareil d'ordonnancement de ressources de système internet de véhicules
US20230145852A1 (en) * 2021-11-10 2023-05-11 Qualcomm Incorporated Dci for inter-cell interference measurements
EP4106390A4 (fr) * 2020-02-12 2023-07-19 Vivo Mobile Communication Co., Ltd. Procédé de rapport de faisceau, noeud de réseau et terminal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020132623A1 (en) * 1998-10-28 2002-09-19 Christopher Hugh Kingdon System and method for positioning a mobile station using two base stations
EP1848233A1 (fr) * 2005-02-08 2007-10-24 Fujitsu Limited Procede d'affectation de tranche pour systeme de communication radio cellulaire et station de base utilisee dans le systeme
US20080089278A1 (en) * 2006-10-11 2008-04-17 Inha-Industry Partnership Institute Method and frame structure for supporting dynamic channel allocation and dynamic power allocation in frequency reuse partitioning based OFDMA system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101043693B (zh) * 2006-03-23 2011-05-11 华为技术有限公司 一种在小区间消除干扰的方法及系统
JP5258444B2 (ja) * 2007-09-28 2013-08-07 株式会社エヌ・ティ・ティ・ドコモ 基地局装置、移動端末、及び周波数共用方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020132623A1 (en) * 1998-10-28 2002-09-19 Christopher Hugh Kingdon System and method for positioning a mobile station using two base stations
EP1848233A1 (fr) * 2005-02-08 2007-10-24 Fujitsu Limited Procede d'affectation de tranche pour systeme de communication radio cellulaire et station de base utilisee dans le systeme
US20080089278A1 (en) * 2006-10-11 2008-04-17 Inha-Industry Partnership Institute Method and frame structure for supporting dynamic channel allocation and dynamic power allocation in frequency reuse partitioning based OFDMA system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015038996A1 (fr) * 2013-09-16 2015-03-19 Qualcomm Incorporated Réutilisation de fréquence fractionnaire sur la base de la mobilité
CN105531960A (zh) * 2013-09-16 2016-04-27 高通股份有限公司 基于移动性的碎片式频率重用
US9717091B2 (en) 2013-09-16 2017-07-25 Qualcomm Incorporated Mobility-based fractional frequency reuse
EP3133853A1 (fr) * 2014-04-14 2017-02-22 China Academy of Telecommunications Technology Procédé et appareil d'ordonnancement de ressources de système internet de véhicules
EP3133853A4 (fr) * 2014-04-14 2017-05-03 China Academy of Telecommunications Technology Procédé et appareil d'ordonnancement de ressources de système internet de véhicules
US10728892B2 (en) 2014-04-14 2020-07-28 China Academy Of Telecommunications Technology Method and device for scheduling resources in internet of vehicles system
EP4106390A4 (fr) * 2020-02-12 2023-07-19 Vivo Mobile Communication Co., Ltd. Procédé de rapport de faisceau, noeud de réseau et terminal
US20230145852A1 (en) * 2021-11-10 2023-05-11 Qualcomm Incorporated Dci for inter-cell interference measurements

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