US20110243106A1 - Methods for carrier agggregation - Google Patents

Methods for carrier agggregation Download PDF

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Publication number
US20110243106A1
US20110243106A1 US13/065,923 US201113065923A US2011243106A1 US 20110243106 A1 US20110243106 A1 US 20110243106A1 US 201113065923 A US201113065923 A US 201113065923A US 2011243106 A1 US2011243106 A1 US 2011243106A1
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United States
Prior art keywords
grant
linking
deactivation
activation
semi
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Abandoned
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US13/065,923
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English (en)
Inventor
Chia-Chun Hsu
Yih-Shen Chen
Yu-Hao Chang
I-Kang Fu
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MediaTek Inc
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MediaTek Inc
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Priority to TW100111539A priority Critical patent/TWI459839B/zh
Priority to US13/065,923 priority patent/US20110243106A1/en
Priority to TW103133164A priority patent/TWI555419B/zh
Assigned to MEDIATEK INC. reassignment MEDIATEK INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHEN, YIH-SHEN, FU, I-KANG, HSU, CHIA-CHUN, CHANG, YU-HAO
Priority to CN201510577327.XA priority patent/CN105099641B/zh
Priority to JP2013501617A priority patent/JP5586778B2/ja
Priority to EP11762022.9A priority patent/EP2526711B8/fr
Priority to ES11762022.9T priority patent/ES2668206T3/es
Priority to CN201180001110.4A priority patent/CN102326424B/zh
Priority to PCT/CN2011/072431 priority patent/WO2011120448A1/fr
Publication of US20110243106A1 publication Critical patent/US20110243106A1/en
Priority to US14/168,369 priority patent/US9516532B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the disclosed embodiments relate generally to wireless network communications, and, more particularly, to carrier aggregation in a mobile communication system.
  • LTE Long-Term Evolution
  • GSM Global System for Mobile communications
  • CDMA Code Division Multiple Access
  • UMTS Universal Mobile Telecommunication System
  • an evolved universal terrestrial radio access network includes a plurality of evolved Node-Bs (eNBs) communicating with a plurality of mobile stations, referred as user equipments (UEs).
  • eNBs evolved Node-Bs
  • UEs user equipments
  • Enhancements to LTE systems are considered so that they can meet or exceed International Mobile Telecommunications Advanced (IMT-Advanced) fourth generation (4G) standard.
  • IMT-Advanced International Mobile Telecommunications Advanced
  • 4G fourth generation
  • One of the key enhancements is to support bandwidth up to 100 MHz and be backwards compatible with the existing wireless network system.
  • Carrier aggregation (CA) is introduced to improve the system throughput.
  • CA carrier aggregation
  • the LTE-Advance system can support peak target data rates in excess of 1 Gbps in the downlink (DL) and 500 Mbps in the uplink (UL).
  • DL downlink
  • UL uplink
  • Such technology is attractive because it allows operators to aggregate several smaller contiguous or non-continuous component carriers (CC) to provide a larger system bandwidth, and provides backward compatibility by allowing legacy users to access the system by using one of the component carriers.
  • CC contiguous or non-continuous component carriers
  • the bandwidth requirement of each UE changes with the amount of data the UE is transmitting and receiving.
  • an eNB may dynamically allocate resources among UEs. Carrier aggregation allows the mobile network to use the bandwidth more efficiently. However, it also increases the complexity of resource management. A light-weighted component-carrier management scheme is thus desirable.
  • One of the issues is how to efficiently activate or deactivate one or more component carriers on a UE.
  • One scenario is upon receiving CC activation/deactivation messages from an eNB, a UE needs to efficiently analyze the messages and make decisions to trigger actions.
  • the UE can decide to activate a plurality of CCs or deactivate a plurality of CCs based on an internal timer, or a combination of internal CC states and a received CC activation/deactivation message from an eNB.
  • BSR Buffer Status Report
  • PHR Power Headroom Report
  • the BSR procedure provides the serving eNB with information about the amount of data available for transmission in the UL buffers of the UE. It is performed in the medium access control (MAC) layer between the UE and the eNB.
  • MAC medium access control
  • TTI transmission time interval
  • MAC-PDU medium access control-packet data unit
  • TB transport block
  • a padding BSR is triggered only when there is enough padding bit.
  • CA imposes a question of how to prepare the BSR when all UE grants from all CCs in one TTI are considered.
  • Another scheduling mechanism is PHR.
  • a UE uses the PHR procedure to provide the serving eNB with a power offset between a maximum transmitting power of the UE and a current transmitting power of the UE. With multiple CCs configured and dynamic activation and deactivation for each CC, it is important to consider the impact for the PHR during these CA procedures.
  • Carrier aggregation also provides new ways to link DL and UL.
  • each DL CC broadcast a UL CC in System Information Block 2 (SIB2).
  • SIB2 System Information Block 2
  • PRACH Physical Radio Access Channel
  • PUCCH Packet Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the network cells all possess this cell specific linking. Since SIB2 linking almost never changes, it can be called static linking.
  • multiple UL CCs can be configured to a UE. Therefore, besides the static SIB2 linking, new types of DL-UL linking are created.
  • a single LCID value is used by an eNB to represent both activation and deactivation command for a user equipment (UE).
  • a single command with multiple instructions is provided to activate and/or deactivate multiple CCs.
  • the command is contained in a media access control (MAC) control element (CE) having a bitmap format, and each bit is associated with an activation or deactivation instruction for a corresponding CE.
  • MAC media access control
  • CE control element
  • a novel buffer status reporting (BSR) procedure of a UE is provided, where only one BSR is calculated after preparing all the transport blocks (TB) within one transmission time interval (TTI) with multiple uplink grants. This ensures that BSR always reports the lasted updated buffer status.
  • Novel power headroom reporting (PHR) format and PHR trigger of a UE are also provided.
  • carrier indicator field (CIF) is added in the PHR MAC CE to be used as a bitmap for configured CC.
  • Scell secondary cell
  • various linking types are created based on whether there is carrier indicator field (CIF) in DL grant or UL grant.
  • CIF carrier indicator field
  • dynamic DL-UL linking is created by a UL grant with CIF.
  • DL semi-static linking is created by a DL grant with CIF.
  • DL semi-static linking is created by a DL grant without CIF.
  • a UL semi-static linking is created by a UL grant without CIF.
  • the various linking types are used in different applications to improve scheduling flexibility and load balancing.
  • the different applications include physical random access channel (PRACH), power control, pathloss reference, timing reference, CC management and CC addition and/or removal.
  • system information is prepared and transmitted by an eNB via dedicated signaling for configuring an SCC of a UE.
  • the system information via dedicated signaling may be different from the system information via broadcast signaling.
  • FIG. 1 illustrates methods to manage multiple CCs efficiently in a mobile network with CA enabled.
  • FIG. 2 illustrates an operation flow of a component carrier activation/deactivation procedure between a base station eNB and a mobile station UE in a carrier aggregation mobile network.
  • FIG. 3 illustrates a configuration diagram of a MAC-PDU according to an embodiment of the present invention.
  • FIG. 4 illustrates a specific example of CC activation/deactivation using MAC Control Element as CC state bitmap.
  • FIG. 5 illustrates a specific example of CC activation/deactivation using SIB as CC state bitmap.
  • FIG. 6A illustrates a CC activation process
  • FIG. 6B illustrates a CC deactivation process
  • FIG. 7 illustrates one embodiment of implicit component carrier deactivation by using a deactivation timer.
  • FIG. 8 illustrates one embodiment of a BSR procedure.
  • FIG. 9A illustrates a specific example of a BSR procedure that results in an obsolete buffer size.
  • FIG. 9B illustrates a specific example of an embodiment of the BSR procedure.
  • FIG. 10 illustrates an updated PHR MAC CE format.
  • FIG. 11 illustrates a specific example of a dynamic DL-UL linking created by UL grant with Carrier Indication Field (CIF).
  • CIF Carrier Indication Field
  • FIG. 12 illustrates a specific example of a DL semi-static linking created by a DL grant with CIF.
  • FIG. 13 illustrates a specific example of DL semi-static linking created by a DL grant without CIF.
  • FIG. 14 illustrates a specific example of UL semi-static linking when one of the UL CC is removed.
  • FIG. 15A illustrates a specific example of a contention based Random Access (RA) process.
  • RA Random Access
  • FIG. 15B illustrates a specific example of a RA process with dedicated preamble.
  • FIG. 1 illustrates methods to manage multiple component carriers (CCs) efficiently in a mobile network 10 with carrier aggregation (CA) enabled.
  • Mobile network system 10 comprises a plurality of evolved Node-Bs (e.g., eNB 12 ) and user equipments (e.g., UE 11 ).
  • eNB 12 communicates with UE 11 at the MAC layer to instruct UE 11 to activate/deactivate corresponding CCs via message 31 .
  • UE 11 processes the command and starts the CC activation/deactivation Process 22 .
  • UE 11 analyzes the command and takes actions to activate/deactivate corresponding CCs and start deactivation timer when needed. Upon finishing activation/deactivation of one or more CCs, UE 11 sends feedback message 32 to eNB 12 . If a new Secondary Cell (SCell) is activated, UE 11 triggers the power headroom reporting (PHR) to be sent to eNB 12 via message 33 . Scheduling Mechanism 23 enhances efficiency for CA enabled network.
  • BSR buffer status reporting
  • BSR buffer status reporting
  • UL uplink
  • TTI Transmission Time Interval
  • Improvements also includes new PHR format, as shown in message 35 , and new PHR triggers.
  • New types of DL-UL linking are introduced in Process 24 , including dynamic linking, DL semi-static linking and UL semi-static linking followed by an UL or DL grant via message 36 .
  • the following descriptions detail methods in the CC Activation/Deactivation Process, Scheduling Mechanisms, and DL-UL linking for a CA enabled system.
  • FIG. 2 illustrates an operation flow of a CC activation/deactivation procedure between a base station eNB 202 and a mobile station UE 201 in a carrier aggregation mobile network.
  • eNB 202 can dynamically activate/deactivate a plurality of CCs of UE 201 by sending a message 210 of CC activate/deactivate message.
  • UE 201 analyzes message 210 and makes decisions to trigger actions.
  • UE 201 gets the current state of activated or deactivated of each CC at step 220 .
  • UE 201 analyzes message 210 and each CC's current state to decide whether this is an activation command for each CC.
  • UE 201 checks the state of this particular CC. If the state of the CC that receives an activation command is deactivated, at step 224 , UE 201 will activate the CC and trigger activation process at step 227 . Similarly, if at step 221 UE 201 finds that it is not an activation command for a specific CC, at step 223 , UE 201 checks the state of this particular CC. If the state of the CC that receives a deactivation command is activated, at step 226 , UE 201 will deactivate the CC and trigger deactivation process at step 228 .
  • UE 201 will not trigger a re-activation or re-deactivation procedure. As illustrated in FIG. 2 , if an activation command is received for an activated CC or a deactivation command is received for a deactivated CC, at step 225 , there will be no action.
  • a UE sends an explicit feedback message for CC activation/deactivation to the serving eNB.
  • the feedback message can be a Layer 1 signaling, like a scheduling request (SR) or HARQ feedback; or it can be a MAC Control Element (MAC-CE).
  • the UE can initiate a Random Access (RA) procedure on a certain CC to inform eNB the activation/deactivation status of the CC.
  • RA Random Access
  • the eNB will build an explicit feedback message at step 229 .
  • UE 201 sends the'CC activation/deactivation feedback message 212 to eNB 202 .
  • Message 212 informs the serving eNB that the UE is ready to receive or transmit for the specific CCs.
  • LCID Logic Channel ID field
  • LCID value to represent both the activation and deactivation command.
  • a bitmap carrying the complete information of the after-command CC state is also included. UE upon receiving this message will compare the CC state in the CC activation/deactivation command message with the current state of corresponding CC to decide whether this is activation or deactivation command.
  • FIG. 3 is a block diagram illustrating the configuration of a MAC-PDU according to an embodiment of the present invention.
  • the MAC-PDU 310 includes MAC Header 311 , MAC Control Element (MAC CE), specifically ACT/DEACT CE 312 , multiple MAC-SDU 313 , and optional padding 314 .
  • MAC header 311 comprises a plurality of MAC sub header 320 .
  • Each MAC sub header takes a specific format, such as MAC sub header 321 .
  • the CC activation/deactivation command uses the specific format of MAC sub header 330 , where the value of LCID 331 indicates command type being CC activation/deactivation.
  • a bitmap of the state of CCs is presented in the ACT/DEACT CE 312 . It has been agreed that LTE should support aggregation of up to 5 DL CCs, however, it is expected to support 8 CCs in the future. Therefore, an 8-bit MAC-CE field is used as a bitmap to represent the CC states.
  • Block 340 illustrates the format of this ACT/DEACT CE 312 .
  • One or more of bits C 0 to C 7 represents a state for a corresponding CC.
  • FIG. 4 illustrates a specific example of CC activation/deactivation using MAC-CE as CC state bitmap.
  • eNB 402 sends a CC Activation/Deactivation message command 411 , as illustrated in FIG. 4 , with the bitmap of the CC state in the MAC-CE.
  • Block 421 shows the current state of all the CCs in UE 401 .
  • DL-CC 1 , UL-CC 1 , DL-CC 2 , UL-CC 2 , and DL-CC 3 are all in activated state, while UL-CC 3 is in deactivated state.
  • the MAC-CE bitmap in message command 411 represents an after-command bitmap of DL ‘101’ and UL ‘101’, where ‘1’ represents the activated state and ‘0’ represents the deactivated state. Each bit in the bitmap thus is associated with an activation or deactivation instruction.
  • UE 401 Upon receiving message command 411 , UE 401 compares the CE bitmap with its current CC state. It determines that since DL-CC 2 and UL-CC 2 's current states are activated and the CE bitmap indicates DL-CC 2 and UL-CC 2 being deactivate, the message command 411 indicates a deactivation instruction for DL-CC 2 and UL-CC 2 .
  • UE 401 deactivates DL-CC 2 and UL-CC 2 respectively.
  • 411 CE bitmap indicates activated state for UL-CC 3 and UL-CC 3 's current state is deactivated
  • UE 401 activates UL-CC 3 at step 433 .
  • CC Activation/Deactivation feedback message 412 is sent to eNB 402 .
  • Block 422 shows the after-command CC states in UE 401 , where DL-CC 1 , UL-CC 1 , DL-CC 3 and UL-CC 3 are in activated states, while DL-CC 2 and UL-CC 2 are in deactivated states.
  • FIG. 5 illustrates a specific example of CC activation/deactivation using SIB as CC state bitmap.
  • eNB 502 sends a CC Activation/Deactivation message command 511 , with the bitmap of the CC state in the SIB, to UE 501 .
  • Block 521 shows the current state of all the CCs in UE 501 .
  • DL-CC 1 , UL-CC 1 , DL-CC 2 , UL-CC 2 , and DL-CC 3 are all in activated state, while UL-CC 3 is not configured.
  • the SIB bitmap in message command 511 representing an after-command bit map of Secondary Cell (SCell) ‘ 101 ’, where ‘1’ represents the activated SCell state and ‘0’ represents the deactivated SCell state.
  • SCell Secondary Cell
  • the message command 511 indicates a deactivation trigger for DL and UL of SCell 2 , which are UL-CC 2 and DL-CC 2 .
  • UE 501 deactivates DL-CC 2 and UL-CC 2 respectively.
  • 511 SIB bitmaps indicates activated state for SCell 3 and UL-CC 3 's current state is not configured, and DL-CC 3 is activated, UE 501 will take no action for SCell 3 .
  • CC Activation/Deactivation feedback message 512 is sent to eNB 502 .
  • Block 522 shows the after-command CC states in UE 501 , where DL-CC 1 , UL-CC 1 , and DL-CC 3 are in activated states; DL-CC 2 and UL-CC 2 are in deactivated states; and UL-CC 3 is not configured.
  • Using one single command to activate/deactivate multiple CCs is an efficient way to manage the resources in a carrier aggregation system. As illustrated in FIG. 2 , specific procedures are needed at UE upon activation or deactivation of CC. Specifically, steps 227 and 228 addresses unique issues presented in the carrier aggregation that is not seen in a traditional mobile network.
  • FIG. 6A illustrates a CC activation process.
  • Process 227 in FIG. 6A starts when a CC is activated (step 610 ).
  • a UE Upon activation of a CC, a UE will activate the SCell before the time required by retuning time (step 611 ); start the deactivation timer for this SCell (step 612 ); send channel state information (CSI) such as CQI/PMI/RI report if they are configured (If the CSI is not available, a special value shall be transmitted) (step 613 ); transmit SRS if configured (step 614 ); and Trigger PHR process (step 615 ).
  • CSI channel state information
  • CSI channel state information
  • FIG. 6B illustrates a CC deactivation process.
  • Process 228 in FIG. 6B starts when a CC is deactivated or the deactivation timer expired (step 620 ).
  • a UE Upon deactivation of a CC, a UE will deactivate the SCell before the time required by retuning time (step 621 ); stop the deactivation timer for this SCell (step 622 ); not stop CQI/PMI/RI reporting until retuning timer is expired (step 623 ); stop SRS transmission (step 624 ); and flush all Hybrid ARQ (HARQ) buffers associated with the SCell (step 625 ).
  • HARQ Hybrid ARQ
  • a deactivation timer is used to implicitly deactivate a SCell.
  • Explicit activation/deactivation should be the preferred way for eNB to perform CC activation/deactivation, since it ensures the highest level of common understanding on the active CC set between eNB and UE.
  • implicit deactivation of configured SCells is a safety mechanism in case the network does not explicitly deactivate the SCell or the deactivation command was lost.
  • a deactivation timer is configured for each Secondary CC (SCC) to do implicit deactivation. The timer is configured when the UE enters the CA mode. In one embodiment, the value of the timer is UE specific, i.e. each SCell is configured with a deactivation timer but they all share the same initial value. When the deactivation timer of an activated DL SCC expires, the UE would locally deactivate the SCell.
  • FIG. 7 illustrates one embodiment of implicit CC deactivation by using a deactivation timer.
  • the process starts at step 701 .
  • the UE configures the value of the deactivation timer at step 703 .
  • the UE at step 704 , then checks if there is any predefined event occurs. If there is such event occurs, the UE checks if this is a deactivate CC event at step 705 . If it is, the'UE executes step 709 to cancel the deactivate timer if it is running; and deactivates the SCell at step 711 .
  • the UE determines that the event is not deactivation event, it then checks if the deactivation timer is running for this SCell at step 706 . If the timer is running, it restarts the deactivation timer at step 708 . If the timer is not running, it starts the deactivation timer at step 707 . After starting or restarting the deactivation timer at steps 707 or 708 , the UE goes back to the waiting mode to check if any predefined event occurs at step 704 . If no predefined event occurs before the deactivation timer expires at step 710 , the UE will deactivate the SCell in step 711 based on the expiration of the deactivation timer.
  • the predefined events may include but are not limited to: a SCell is activated; a physical downlink control channel (PDCCH) DL assignment is received on the SCell; a PDCCH UL grant is received on the SCell, if UL CC is configured; a PDCCH DL assignment is received on the scheduling cell for the SCell; a PDCCH UL grant is received on the scheduling cell for the SCell, if UL CC is configured; a configured physical downlink or uplink shared channel (PDSCH/PUSCH) transmission takes place on the SCell, if SPS is supported on the CC; and an activation/deactivation Command is received.
  • PDSCH physical downlink control channel
  • the set of light-weighted CC activation and deactivation methods can improve the efficiency of carrier management in a carrier aggregation based mobile system. Further consideration is given to scheduling mechanisms with carrier aggregation.
  • an updated BSR procedure can avoid the problem of reporting a buffer status in the BSR that did not count all UL grants from all the CCs in one TTI. Because CA is within the same eNB, for system efficiency, it is unnecessary to prepare multiple BSRs within one TTI even with more than one UL grants from different CCs within one TTI. Only one TB should include a regular or a periodic BSR. However, if only one regular or periodic BSR is reported, the current BSR scheme may result in BSR not reflecting the updated UL grant.
  • FIG. 9A illustrates a specific example of a current BSR procedure that results in an obsolete buffer status.
  • UE 912 has a buffer size of 300, shown in Block 914 .
  • eNB 913 sends UE 912 an UL grant A with size of 150. Therefore, at step 916 , the buffer size of UE 912 becomes 150 (block 916 ). This triggers a BSR, and therefore, a buffer status of 150 is built for the TB. Since there should be one BSR per TTI, the BSR trigger is cancelled.
  • eNB 913 can send another UL Grant B, with the size of 100. Therefore, at step 919 , UE 912 's actual buffer status is 50.
  • the BSR sent via message 911 which was built before the last TB, still carries a size of 150. Therefore, BSR message 911 does not reflect the most recent buffer status of UE 912 .
  • FIG. 8 illustrates one embodiment of such novel BSR procedure.
  • TTI starts at step 801 .
  • the UE keeps tracking if there is BSR Trigger occurs at step 802 . If a Regular BSR trigger exists, at step 804 , it is determined whether this is the last TB for this TTI. If it is not the last TB, UE will wait for the last TB at step 806 . If it is the last TB of the TTI, UE will build the BSR at step 807 , the BSR can be inserted to any TB in this TTI. For each TB, at step 803 the UE checks if a Regular BSR is inserted and whether there is room for padding BSR. Padding BSR is triggered when there is room and no Regular BSR in the TB, UE continues with building the padding BSR for this TB at step 805 .
  • FIG. 9B illustrates specific examples of such embodiment of the novel BSR procedure. Similar to FIG. 9A , UE 922 has a buffer size of 300 (block 924 ). At step 925 , eNB 923 send UE 922 an UL grant A with size of 150. Therefore, at step 926 , the buffer size of UE 922 becomes 150 (block 926 ). This triggers a BSR. In the novel BSR procedure, UE checks if this is the last TB. Since it is not, no BSR is built for this TB. UE keeps checking when the last TB for this TTI will be build.
  • eNB 923 can send another UL Grant B, with the size of 100. Therefore, at step 929 , the actual UE 922 's buffer status is 50.
  • the BSR is built, with the buffer status of 50.
  • UE 922 then included the correct buffer status in the BSR message 921 , which is sent to eNB 923 .
  • PHR is another scheduling mechanism.
  • FIG. 10 illustrates an updated PHR MAC CE.
  • Carrier Indicator Field (CIF) is added in the PHR MAC CE to be used as a bitmap for configured CC.
  • Block 1001 shows such bitmap.
  • One or more of bits C 0 to C 7 in 1001 represent one configured CC. The value of each bit indicates whether the corresponding CC's PHR is included.
  • Block 1002 in FIG. 10 represents multiple PHR data blocks. These data blocks can take in any format that contains the PHR information for each CC.
  • Radio resource control (RRC) parameters associate with the PHR procedure.
  • Periodic PHR-Timer, prohibitPHR-Timer, and dlPathlossChang are some of the examples. These parameters associate with a particular CC. In one embodiment, all UL CC shares the same set of value for these RRC parameters.
  • Simultaneous transmission of PUCCH and PUSCH is also possible in a mobile network. In one embodiment independent PHR for PUCCH and PUSCH are sent in such scenario.
  • PUCCH PHR can be reported with PUSCH PHR for the Primary Cell (PCell).
  • PCell Primary Cell
  • new types of UL-DL linking can further improve the efficiency of the system by providing more flexibility in scheduling as well as load balancing.
  • CA the traditional mobile network uses SIB2 static linking.
  • new types of DL-UL linking are created based on whether there is CIF in UL grant or DL grant. There are four cases: UL grant with CIF, DL grant with CIF, UL grant without CIF and DL grant without CIF. Further, since CC can be activated and deactivated, procedures are needed to update the DL-UL linking upon CC activation/deactivation.
  • Dynamic DL-UL linking can be created by UL grant with CIF. Cross-carrier scheduling in the UE specific search space should always be supported by explicit CIF.
  • PHICH Physical Hybrid ARQ Indicator Channel
  • a new DL-UL linking is defined for a cross-carrier UL grant.
  • Such linking is grant specific and lasts for the life cycle of this UL grant.
  • FIG. 11 illustrates a specific example of a dynamic DL-UL linking created by UL grant with CIF.
  • UE 1101 has statically linked UL-DL as shown in Block 1104 , where DL CC 1 and UL CC 2 are the Primary CCs (PCCs) and UL CC 2 is the PUCCH.
  • PHICH is only transmitted on DL CC 1 .
  • a UL-DL dynamic link is created as shown in Block 1105 .
  • dynamic linking 1106 links DL CC 1 and UL CC 2 .
  • Link 1106 is 1103 UL grant specific and lasts only for the life cycle of 1103 UL grant.
  • a second type of new DL-UL linking is DL Semi-Static Linking, which can be created by a DL Grant, this DL Grant can have CIF or not.
  • a UE In a DL grant, a UE has to reply ACK/NACK on the PUCCH.
  • UL CC 2 is configured to be PUCCH for UE 1201 .
  • the PUCCH UL CC is the UL PCC, as shown in FIG. 12 , where UL CC 2 is the UL PCC.
  • the PUCCH is semi-statically configured to the UE and is linked with the DL grant CC or CCs.
  • This new linking is called DL Semi-Static Linking.
  • FIG. 12 illustrates a specific example of a DL semi-static linking created by a DL grant with CIF.
  • UE 1201 has statically linked CCs as shown in Block 1203 .
  • UE 1201 Upon receiving this DL Grant, UE 1201 sends back ACK/NACK using the configured PUCCH, which is UL CC 2 as shown in Block 1203 and 1204 . Therefore, an N to 1 DL semi-static linking is created with UL CC 2 linking to DL CC 1 , DL CC 2 and DL CC 3 .
  • FIG. 13 illustrates a specific example of DL semi-static linking created by a DL grant without CIF.
  • UE 1301 has statically linked CCs as shown in 1303 , where UL CC 2 is configured to be PUCCH.
  • eNB 1302 sends a DL grant on DL CC 1 .
  • UE replies an ACK/NACK, at step 1306 , using configured PUCCH, which is UL CC 2 .
  • Block 1304 shows that a semi-static linking of DL CC 1 and UL CC 2 is created from this DL grant.
  • a UL grant without CIF has several choices in creating DL-UL linking.
  • a UL grant can use the static linking or a DL semi-static linking.
  • reuse the static SIB2 or DL semi-static linking limits the flexibility of scheduler. Since SIB2 static linking and configured PUCCH cannot be easily modified, reusing these types of linking makes it hard to adjust to the temporary load balancing demand.
  • a UL Semi-Static Linking is defined for UL grant without CIF. This linking can be created at the time of a CC addition and lasts until the time of removal of a CC.
  • FIG. 14 illustrates a specific example of UL semi-static linking when one of the UL CC is removed.
  • UE 1401 has statically linked CCs as shown in Block 1403 , where UL CC 2 is configured to be a UL semi-static linking UL CC.
  • UL CC 1 is removed (e.g., denoted by slashed shade). Therefore, the UL CC 1 is no longer linked with DL CC 1 .
  • eNB 1402 sends a UL grant without CIF on DL CC 1 .
  • UE 1401 therefore created a UL semi-static linking between DL CC 1 and UL CC 2 .
  • N to 1 UL semi-static linking can be created.
  • eNB 1402 sends another UL grant without CIF on DL CC 1 .
  • a new UL semi-static linking between DL CC 1 and UL CC 3 can be created. The resulting linking is as shown in Block 1405 .
  • different types of DL-UL linking have different characteristics, thus can be used in different types of applications accordingly.
  • different types of DL-UL linking can be used for different types of PRACH application.
  • SIB2 static linking is used for contention based Random Access (RA).
  • RA contention based Random Access
  • static linking is used to decide the UL CC of a UL grant for Msg 3 .
  • PHICH for Msg 3 is provided on the DL CC where the UE received the RAR, for which the linking is also the static linking.
  • FIG. 15A shows a specific example of a contention based RA process.
  • UE 1501 has statically linked CCs as shown in Block 1503 .
  • a UL semi-static linking between DL CC 1 an UL CC 2 also exists for UE 1501 .
  • UL CC 1 is removed (e.g., denoted by slashed shade).
  • UE 1501 initiates a contention based RA process on UL CC 2 .
  • eNB 1502 replies with RAR on the DL CC 2 , which is statically linked with UL CC 2 , where the step 1504 is initiated.
  • UE 1501 at step 1506 , sends Msg 3 using UL CC 2 , which is statically linked with DL CC 2 .
  • FIG. 15B illustrates a specific example of a RA process with dedicated preamble.
  • UE 1511 has statically linked CCs as shown in Block 1513 .
  • a UL semi-static linking between DL CC 1 an UL CC 2 also exists for UE 1511 .
  • UL CC 1 is removed (e.g., denoted with slashed shade).
  • UE 1511 at step 1514 initiates a RA with dedicated preamble using UL CC 3 . Since UE 1511 's identity is known to eNB 1512 when eNB 1512 receives the dedicated preamble. eNB 1512 also knows the operating CC set of UE 1511 , eNB 1512 can send RAR on any CC that UE 1511 is currently monitoring. Therefore, at step 1515 , eNB 1512 send RAR on DL CC 1 . At step 1516 , UE 1511 sends Msg 3 on UL CC 2 , which is linked to DL CC 1 through UL semi-static linking.
  • power control command can come with or without CIF.
  • dynamic linking is used for power control command with CIF.
  • SIB2 static linking or UL semi-static linking is used to identify the UL CC for power control command without CIF.
  • a third example of DL-UL linking is for pathloss reference.
  • static link is used for pathloss reference.
  • semi-static linking assigned or modified by RRC signaling, e.g., UL semi-static linking is used for pathloss reference.
  • a fourth example of DL-UL linking is for timing reference. Similar to pathloss reference, in one embodiment of the invention, static linking is used for timing reference. In another embodiment of the invention, semi-static linking assigned or modified by RRC signaling, e.g., DL or UL semi-static linking is used for timing reference.
  • CC management also requires changes, specifically the labeling of CC or the CIF on which RANI has decided the mapping should be UE specific and configured by RRC.
  • a UL CC can have more than one CIF value.
  • carrier aggregation addition or removal of DL or UL CCs is supported. With the new types of DL-UL linking, specific methods apply to these linking when DL or UL CCs are added or removed.
  • SIB2 static linking and UL semi-static linking require further thinking.
  • SIB2 linked DL CC can be either configured with the UL CC or an existing DL CC which configured earlier by a DL CC only addition.
  • PRACH IE if it is absent, it implies that PRACH is not configured for the UE on the UL SCC. Otherwise, PRACH resource is configured for the UE.
  • PUCCH IE if it is absent, it implies that this is a UL SCC.

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TW100111539A TWI459839B (zh) 2010-04-02 2011-04-01 管理多成分載波、緩存器狀態報告以及功率餘裕回報方法
US13/065,923 US20110243106A1 (en) 2010-04-02 2011-04-01 Methods for carrier agggregation
TW103133164A TWI555419B (zh) 2010-04-02 2011-04-01 管理多成分載波、緩存器狀態報告以及功率餘裕回報方法
PCT/CN2011/072431 WO2011120448A1 (fr) 2010-04-02 2011-04-02 Procédés d'agrégation de porteuses
JP2013501617A JP5586778B2 (ja) 2010-04-02 2011-04-02 キャリアアグリゲーションの方法
CN201510577327.XA CN105099641B (zh) 2010-04-02 2011-04-02 管理多分量载波的方法
EP11762022.9A EP2526711B8 (fr) 2010-04-02 2011-04-02 Procédés d'agrégation de porteuses
ES11762022.9T ES2668206T3 (es) 2010-04-02 2011-04-02 Métodos para la agregación de portadoras
CN201180001110.4A CN102326424B (zh) 2010-04-02 2011-04-02 管理多分量载波、缓冲器状态报告及功率余裕报告方法
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JP5586778B2 (ja) 2014-09-10
EP2526711A1 (fr) 2012-11-28
EP2526711B8 (fr) 2018-03-21
CN105099641B (zh) 2018-12-21
WO2011120448A1 (fr) 2011-10-06
EP2526711B1 (fr) 2018-02-07
EP2526711A4 (fr) 2016-03-02
TW201503730A (zh) 2015-01-16
US20140146779A1 (en) 2014-05-29
ES2668206T3 (es) 2018-05-17
TW201206218A (en) 2012-02-01
CN102326424B (zh) 2015-10-21
TWI555419B (zh) 2016-10-21
JP2013528005A (ja) 2013-07-04

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