WO2011121112A1 - Dynamic buffer status report selection for carrier aggregation - Google Patents

Dynamic buffer status report selection for carrier aggregation Download PDF

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Publication number
WO2011121112A1
WO2011121112A1 PCT/EP2011/055107 EP2011055107W WO2011121112A1 WO 2011121112 A1 WO2011121112 A1 WO 2011121112A1 EP 2011055107 W EP2011055107 W EP 2011055107W WO 2011121112 A1 WO2011121112 A1 WO 2011121112A1
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WO
WIPO (PCT)
Prior art keywords
buffer status
status report
amount
user equipment
currently
Prior art date
Application number
PCT/EP2011/055107
Other languages
French (fr)
Inventor
Chunli Wu
Benoist Pierre Sebire
Claudio Rosa
Original Assignee
Nokia Siemens Networks Oy
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.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to JP2013501862A priority Critical patent/JP5830520B2/en
Priority to EP11711885.1A priority patent/EP2554002B1/en
Priority to CN201180027002.4A priority patent/CN102907161B/en
Priority to KR1020127028772A priority patent/KR101412187B1/en
Priority to US13/638,985 priority patent/US9019818B2/en
Publication of WO2011121112A1 publication Critical patent/WO2011121112A1/en
Priority to US14/087,518 priority patent/US20140078965A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • 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
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/12—Flow control between communication endpoints using signalling between network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1221—Wireless traffic scheduling based on age of data to be sent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/29—Flow control; Congestion control using a combination of thresholds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/04—Registration at HLR or HSS [Home Subscriber Server]

Definitions

  • TECHNICAL FIELD The exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer programs and, more specifically, relate to techniques to formulate reports for a network access ele ⁇ ment, where the reports are indicative of an amount of data that is buffered in a user equipment.
  • eNB E-UTRAN Node B (evolved Node B)
  • LTE E-UTRAN evolved UTRAN
  • E-UTRAN LTE long term evolution of UTRAN
  • UE user equipment such as a mobile station, mo- bile node or mobile terminal
  • E- UTRAN also referred to as UTRAN-LTE or as E-UTRA
  • the DL access technique is OFDMA
  • the UL access technique is SC- FDMA .
  • This system may be referred to for convenience as LTE Rel-8.
  • the set of specifications given generally as 3GPP TS 36.xyz (e.g., 36.211, 36.311, 36.312, etc.) may be seen as describing the Release 8 LTE system. More recently, Release 9 versions of at least some of these specifications have been published including 3GPP TS 36.300, V9.1.0 (2009- 9) .
  • FIG. 1A reproduces Figure 4.1 of 3GPP TS 36.300 V8.11.0, and shows the overall architecture of the EUTRAN system (Rel- 8) .
  • the E-UTRAN system 2 includes eNBs, providing the E-UTRAN user plane ( PDCP/RLC/MAC/PHY) and control plane (RRC) proto ⁇ col terminations towards the UE (not shown) .
  • the eNBs are in ⁇ terconnected with each other by means of an X2 interface.
  • the eNBs are also connected by means of an SI interface to an EPC, more specifically to a MME by means of a SI MME inter ⁇ face and to an S-GW by means of a SI interface (MME/S-GW 4) .
  • the SI interface supports a many-to-many relationship between MMEs / S-GWs and eNBs .
  • the eNB hosts the following functions:
  • RRM Radio Admission Control
  • Connection Mobility Control dynamic allocation of resources to UEs in both UL and DL (scheduling) ;
  • IP header compression and encryption of the user data stream selection of a MME at UE attachment;
  • MME/S-GW EPC
  • LTE-A LTE-Advanced
  • LTE-A 3GPP LTE
  • LTE Rel-10 targeted towards future IMTA systems, re ⁇ ferred to herein for convenience simply as LTE-Advanced (LTE- A) .
  • LTE-A 3GPP TR 36.913, V9.1.0 (2009-12), 3rd Generation Partnership Project; Techni- cal Specification Group Radio Access Network; Requirements for Further Advancements for EUTRA (LTE-Advanced) (Release 9), incorporated by reference herein.
  • a goal of LTE-A is to provide significantly enhanced services by means of higher data rates and lower latency with reduced cost.
  • LTE-A is di- rected toward extending and optimizing the 3GPP LTE Rel-8 ra ⁇ dio access technologies to provide higher data rates at lower cost.
  • LTE-A will be a more optimized radio system fulfilling the ITU-R requirements for IMT-Advanced while keeping back ⁇ wards compatibility with LTE Rel-8.
  • LTE-A should operate in spectrum allocations of different sizes, including wider spectrum allocations than those of LTE Rel-8 (e.g., up to 100MHz) to achieve the peak data rate of lOOMbit/s for high mobility and 1 Gbit/s for low mobility.
  • carrier aggregation is to be considered for LTE-A in order to support bandwidths larger than 20 MHz.
  • Carrier aggre ⁇ gation where two or more component carriers (CCs) are aggre- gated, is considered for LTE-A in order to support transmis ⁇ sion bandwidths larger than 20MHz.
  • the carrier aggregation could be contiguous or non-contiguous. This technique, as a bandwidth extension, can provide significant gains in terms of peak data rate and cell throughput as compared to non- aggregated operation as in LTE Rel-8.
  • a terminal may simultaneously receive one or multiple compo ⁇ nent carriers depending on its capabilities.
  • a LTE-A terminal with reception capability beyond 20 MHz can simultaneously receive transmissions on multiple component carriers.
  • a LTE Rel-8 terminal can receive transmissions on a single compo ⁇ nent carrier only, provided that the structure of the compo ⁇ nent carrier follows the Rel-8 specifications.
  • LTE-A should be backwards compatible with Rel-8 LTE in the sense that a Rel-8 LTE terminal should be operable in the LTE-A system, and that a LTE-A terminal should be operable in a Rel-8 LTE system.
  • Rel-8 terminals receive/transmit on one CC
  • LTE-A terminals may receive/transmit on multiple CCs simultaneously to achieve higher (wider) band- widths .
  • a UE to aggre ⁇ gate a different number of CCs originating from the same eNB, of possibly different BWs, in the UL and the DL .
  • Rel-8 UEs are assumed to be served by a single stand-alone CC, while Release 10 (LTE-A) terminals can be configured to receive or transmit simultaneously on multiple aggregated CCs in the same TTI .
  • LTE-A Release 10
  • one subframe is equal to one millisecond, and comprises two 0.5 millisecond slots.
  • configured CCs can be de-activated in order to reduce the UE power consumption.
  • the UE monitor- ing activity of a de-activated carrier is reduced (e.g., no PDCCH monitoring and CQI measurements are needed) .
  • This mechanism can be referred to as carrier activation/de- activation .
  • the eNB can configure UEs to send BSRs and PHRs in the UL .
  • the BSR indicates the amount of data the UE has available for transmission, while the PHR provides the eNB with information about the difference between the nominal UE maximum transmit power and the estimated power for UL-SCH transmission. BSRs are typically used by the eNB to select an appropriate trans- port block size, while PHRs are typically used to select an appropriate MCS .
  • BSRs are sent by the UE in the UL in the form of Buffer Status Report MAC Control Elements (see 3GPP TS 36.321, Sec ⁇ tion 6.1.3.1, "Buffer Status Report MAC Control Elements") in which the Buffer Size (BS) field identifies the total amount of data available for transmission.
  • the length of this field is specified as 6 bits and contains exponentially distributed buffer size levels based on a minimum buffer size level (B m i n ) t a maximum buffer size level (B max ) and a number of reported buffer size levels (N) .
  • Figure 3A herein reproduces Figure 6.1.3.1-1 of 3GPP TS 36.321 and shows a Short BSR and Truncated BSR MAC control element
  • Figure 3B herein reproduces Figure 6.1.3.1-2 of 3GPP TS 36.321 and shows a Long BSR MAC control element
  • Fig ⁇ ure 3C herein reproduces Table 6.1.3.1-1 of 3GPP TS 36.321 and shows buffer size levels for BSR.
  • BSR Buffer Status Report
  • MAC control elements consist of either the Short BSR and Truncated BSR format, with one LCG ID field and one corresponding buffer Size field (see Figure 3A herein) or the Long BSR format having four buffer size fields, corresponding to LCG IDs #0 through #3 (see Figure 3B herein) .
  • the LCG is understood to be a group of UL logical channels for which a single joint buffer fill level is reported by the UE in a BSR.
  • the mapping of logical channels to LCGs is defined by the eNodeB.
  • the BSR formats are identified by MAC PDU subheaders with LCIDs as specified in table 6.2.1-2 ( Figure 3D herein) .
  • the fields LCG ID and Buffer Size are defined as follows.
  • LCG ID The Logi- cal Channel Group ID field identifies the group of logical channel (s) for which buffer status is being reported. The length of the field is 2 bits.
  • Buffer Size The Buffer Size field identifies the total amount of data available across all logical channels of a logical channel group after the MAC PDU has been built. The amount of data is indicated as the number of bytes. It includes all data that is available for transmission in the RLC layer and in the PDCP layer. The size of the RLC and MAC headers are not considered in the buffer size computation. The length of this field is 6 bits.
  • the values taken by the Buffer Size field are shown in Table 6.1.3.1-1 ( Figure 3C herein).
  • the BS field as specified for LTE Rel-8 and Rel-9 is based on the assumption that only one CC is used in the UL and, as a result, is not adequate for use with the higher data rates made possible by the use of CA in Rel-10 and be ⁇ yond .
  • the exemplary embodiments of this invention provide a method that comprises buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status re- port to a network access node, where the threshold value is a function of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
  • the exemplary embodiments of this invention provide an apparatus that comprises a processor and a memory including computer program code.
  • the memory and computer program code are configured to, with the processor, cause the apparatus at least to perform buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status re ⁇ port to a network access node, where the threshold value is a function of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
  • the exemplary embodiments of this invention provide a method that comprises buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status re ⁇ port to a network access node, where triggering the genera ⁇ tion of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plu ⁇ rality of buffer status report tables that is currently in use .
  • the exemplary embodiments of this invention provide an apparatus that comprises a proc ⁇ essor and a memory including computer program code.
  • the memory and computer program code are configured to, with the processor, cause the apparatus at least to perform, buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status report to a network access node.
  • the triggering the generation of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plurality of buffer status report tables that is currently in use.
  • Figure 1A reproduces Figure 4.1 of 3GPP TS 36.300, and shows the overall architecture of the EUTRAN system.
  • Figure IB shows an example of carrier aggregation as proposed for the LTE-A system.
  • Figure 2 shows a simplified block diagram of various elec ⁇ tronic devices that are suitable for use in practicing the exemplary embodiments of this invention.
  • Figure 3A reproduces Figure 6.1.3.1-1 of 3GPP TS 36.321 and shows a Short BSR and Truncated BSR MAC control element
  • Fig ⁇ ure 3B reproduces Figure 6.1.3.1-2 of 3GPP TS 36.321 and shows a Long BSR MAC control element
  • Figure 3C reproduces Table 6.1.3.1-1 of 3GPP TS 36.321 and shows Buffer size lev ⁇ els for BSR
  • Figure 3D reproduces Table 6.2.1-21 of 3GPP TS 36.321 and shows values of the LCID for the UL-SCH.
  • Figure 4 shows the format of a MAC R/R/E/LCID sub-header, and reproduces Figure 6.1.2-2 of 3GPP TS 36.321.
  • Figure 5 is a logic flow diagram that illustrates the opera ⁇ tion of a method, and a result of execution of computer pro ⁇ gram instructions embodied on a computer readable memory, in accordance with the exemplary embodiments of this invention.
  • Figure 6 is a logic flow diagram that illustrates the opera ⁇ tion of a method, and a result of execution of computer pro ⁇ gram instructions embodied on a computer readable memory, further in accordance with the exemplary embodiments of this invention.
  • the exemplary embodiments of this invention relate generally to mobile wireless communication, such as 3GPP LTE-A.
  • the ex ⁇ emplary embodiments of this invention relate more specifi ⁇ cally to the UL buffer size and the reporting of same.
  • the BSR as defined in Rel-8 and Rel-9 supports a maximum buffer size of 150,000 bytes (see Figure 3C) .
  • the ex- emplary embodiments of this invention address and solve this problem for the case of CA where significantly higher UL data rates can be supported.
  • a wireless network 1 is adapted for communication over a wire- less link 11 with an apparatus, such as a mobile communica ⁇ tion device which may be referred to as a UE 10, via a net ⁇ work access node, such as a Node B (base station) , and more specifically an eNB 12.
  • an apparatus such as a mobile communica ⁇ tion device which may be referred to as a UE 10
  • a net ⁇ work access node such as a Node B (base station)
  • eNB 12 evolved Node B
  • the network 1 may include a network control element (NCE) 14 that may include the MME/SGW func- tionality shown in Figure 1A, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the internet) .
  • the UE 10 includes a controller, such as at least one computer or a data processor (DP) 10A, a non-transitory computer-readable memory medium embodied as a memory (MEM) 10B that stores a program of computer instructions (PROG) IOC, and a suitable radio frequency (RF) transceiver 10D for bidirectional wire ⁇ less communications with the eNB 12 via one or more antennas.
  • DP data processor
  • PROG program of computer instructions
  • RF radio frequency
  • the eNB 12 also includes a controller, such as at least one computer or a data processor (DP) 12A, a computer-readable memory medium embodied as a memory (MEM) 12B that stores a program of computer instructions (PROG) 12C, and a suitable RF transceiver 12D for communication with the UE 10 via one or more antennas (typically several when MIMO operation is in use) .
  • the eNB 12 is coupled via a data / control path 13 to the NCE 14.
  • the path 13 may be implemented as the SI inter ⁇ face shown in Figure 1A.
  • the eNB 12 may also be coupled to another eNB via data / control path 15, which may be imple- mented as the X2 interface shown in Figure 1A.
  • the UE 10 can be assumed to also include a MAC function or module 10E, and the memory 10B can be assumed to include one or more data buffers 10F.
  • the memory 10B can also store one or more buffer size tables.
  • the eNB 12 can be as ⁇ sumed to include a corresponding MAC function or module 12E.
  • the MAC modules 10E, 12E can be compatible with, and configured to operate using, the MAC procedures defined in 3GPP TS 36.321, as extended and en ⁇ hanced in accordance with the exemplary embodiments of this invention .
  • the PROGs IOC and 12C are assumed to include program instruc ⁇ tions that, when executed by the associated DP, enable the device to operate in accordance with the exemplary embodi ⁇ ments of this invention, as will be discussed below in greater detail. That is, the exemplary embodiments of this invention may be implemented at least in part by computer software executable by the DP 10A of the UE 10 and/or by the DP 12A of the eNB 12, or by hardware, or by a combination of software and hardware (and firmware) .
  • the various embodiments of the UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and play ⁇ back appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incor ⁇ porate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and play ⁇ back appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incor ⁇ porate combinations of such functions.
  • the computer-readable MEMs 10B and 12B may be of any type suitable to the local technical environment and may be imple- mented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and sys ⁇ tems, fixed memory and removable memory.
  • the DPs 10A and 12A may be of any type suitable to the local technical environ- ment, and may include one or more of general purpose com ⁇ puters, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multi-core processor architectures, as non-limiting examples. Described now in further detail are several aspects of the exemplary embodiments of this invention.
  • a plurality of buffer size level tables tailored for different maximum uplink data rates.
  • one buffer size table can be provided with a maximum of 150,000 bytes, thus corresponding to the same UL data rate as in Rel-8 and Rel-9.
  • This first table may be identical to the table shown in Figure 3.
  • a second table with a maximum of 300,000 bytes, corresponding to twice the UL data rate of Rel-8 and Rel-9, can also be provided to cover the case of, for example, the aggregation of two CCs in the UL .
  • a third buffer size table with a maximum of 450,000 bytes, corre- sponding to three times the UL data rate of Rel-8 and Rel-9, can also be provided to cover the case of, for example, the aggregation of three CCs in the UL .
  • the MAC function 10E of the UE 10 dynamically selects the buffer size level table to be used based on the amount of data buffered.
  • the UE 10 selects one of the tables according to the amount of data it has buffered, e.g., the UE 10 selects the table with a minimum B max that does not exceed its current buffer status (i.e., the table with the finest granularity) .
  • the UE 10 can then indicate to the eNB 12 which table is used via, for example, two R (reserved) bits in the MAC header for BSR (see the R/R/E/LCID sub-header shown in Figure 4) .
  • All LCGs use the same BSR table in the Long BSR which is selected ac ⁇ cording to the LCG with the most data buffered (or alterna ⁇ tively according to the LCG that has triggered the BSR) .
  • this inven ⁇ tion there is introduced a threshold-based BSR trigger, with the threshold being implicitly deduced by the buffer exceed ⁇ ing what can be supported by currently configured or allo- cated resource (s) within some certain time.
  • the time can be configurable or it can be fixed so as to be the same as the response time (e.g., 16 TTIs used for calculating the maximum level for the BSR table) .
  • the threshold may be per LCG, e.g., the BSR is triggered when the buffer of a LCG exceeds the threshold such that another BSR table is to be used (i.e., the buffer exceeds the value of B max of the BSR table cur ⁇ rently in use) .
  • the threshold value can be di ⁇ rectly configurable by the eNB 12 in DL signaling.
  • the buffer size tables can be generated with different B max values and expo ⁇ nentially distributed buffer size levels.
  • B max is determined by the number of configured / activated UL CCs and / or whether UL MIMO is configured for each CC .
  • B max for two UL CCs can be twice as large as for a single UL CC .
  • each BRS table has a different B max value.
  • the B max values can be determined by the data rate supported with different numbers of UL CC and / or with UL MIMO, and B k calculated the same way as in the first aspect discussed above.
  • For an implicit threshold and by example, when one CC is configured for the UE 10 the BSR is triggered when the buffer status exceeds 150Kbytes, which is the maximum value can be supported with one CC within a 16 TTI response time.
  • BSR is triggered if the buffer exceeds lOOKbytes times some certain time (e.g., 16 TTI or some configurable time), which means BSR is triggered when the buffer cannot be emp ⁇ tied with the currently allocated UL resource within the specified time (e.g., with 16 TTI) .
  • some certain time e.g. 16 TTI or some configurable time
  • the exemplary embodiments of this invention can be implemented in a variety of different forms.
  • the BSR tables are not necessarily linked only to the number of CCs in use.
  • the UE 10 may store two BSR tables, with one table iden ⁇ tical to (or substantially identical to) the table used for Rel-8 (e.g., see Figure 3C) , and a second table composed so as to cover the use case of five UL CCs plus UL MIMO.
  • more accurate UL buffer information is provided for the eNB 12 to enable more efficient scheduling and a better determination as to whether more UL CC(s) need to be configured / activated, or whether some existing UL CC should be de- configured / deactivated.
  • the BSR format need not change from what is already specified for Rel-8 and Rel-9, and thus the impact on the MAC protocol is minimized, i.e., 6 bits are still used for the BS for a LCG with a MAC header to indicate that it is a BSR MAC control element (CE) .
  • CE BSR MAC control element
  • the exem ⁇ plary embodiments of this invention provide a method, appara ⁇ tus and computer program (s) to enhance the reporting of the amount of buffered data in the UE 10 to the eNB 12.
  • FIG. 5 is a logic flow diagram that illustrates the opera ⁇ tion of a method, and a result of execution of computer pro ⁇ gram instructions, in accordance with the exemplary embodi ⁇ ments of this invention.
  • a method performs, at Block 5A, a step of buffer ⁇ ing data in a user equipment.
  • Block 5B there is a step, performed in response to an amount of buffered data exceeding a threshold value, of triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where the threshold value is a func ⁇ tion of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
  • the uplink data transmission resource comprises one or more component carriers
  • the capacity increases as the number of component carriers increases.
  • TTIs transmission time intervals
  • the threshold value is per logical channel group. In accordance with the foregoing method, where the threshold value is related to a maximum amount of buffered data sup ⁇ ported by a buffer status table that is currently in use by the user equipment.
  • the threshold value is related to a maximum amount of time that is avail ⁇ able during which the buffered data can be transmitted to the network access node using the currently allocated uplink data transmission resource.
  • the uplink data transmission resource comprises one or more component carriers
  • the capacity increases as the number of com- ponent carriers increases
  • the time is expressed in transmission time intervals
  • the user equipment stores a plurality of buffer status report tables, individual ones of which correspond to an individual one of a number of component carriers allocated to the user equipment for transmitting data on the uplink.
  • each of the plurality of buffer status report tables has a different maximum value and granularity.
  • the user equipment stores a plurality of buffer status report tables
  • at least one of the plurality of buffer status re ⁇ port tables is composed in consideration of a number of up ⁇ link component carriers in use and in consideration of uplink multiple input / multiple output operation.
  • triggering the generation of a buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plu ⁇ rality of buffer status report tables that is currently in use .
  • the user equipment selects the buffer status report table that is currently in use according to an amount of buffered data by selecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
  • Figure 6 is a logic flow diagram that illustrates the opera ⁇ tion of a method, and a result of execution of computer pro ⁇ gram instructions, further in accordance with the exemplary embodiments of this invention.
  • a method performs, at Block 6A, a step of buffering data in a user equipment.
  • Block 6B there is a step performed, in response to an amount of buffered data ex ⁇ ceeding a threshold value, of triggering the generation of a buffer status report and the sending of the buffer status re ⁇ port to a network access node, where triggering the genera ⁇ tion of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plu ⁇ rality of buffer status report tables that is currently in use .
  • the user equipment selects the buffer status report table that is cur ⁇ rently in use according to an amount of buffered data by se ⁇ lecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
  • the medium ac ⁇ cess control buffer status report header also identifies the particular logical channel group.
  • the various blocks shown in Figures 5 and 6 may be viewed as method steps, and/or as operations that result from operation of computer program code, and/or as a plurality of coupled logic circuit elements constructed to carry out the associ ⁇ ated function (s) . That is, also encompassed by these exem- plary embodiments are apparatus that are configured to oper ⁇ ate so as to execute the exemplary methods described above with respect to Figure 5 and 6. Also encompassed by these exemplary embodiments is an appara ⁇ tus, such as a network access node (e.g., the eNB 12), that is configured to respond to and interpret the BSRs received on the UL from the UE 10.
  • a network access node e.g., the eNB 12
  • the exemplary embodiments also pertain to an apparatus that comprises means for buffering data in a user equipment and means, responsive to an amount of buffered data exceeding a threshold value, for triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where the threshold value is a func ⁇ tion of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
  • the exemplary embodiments also pertain to an apparatus that comprises means for buffering data in a user equipment and means, responsive to an amount of buffered data exceeding a threshold value, for triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where triggering the generation of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plurality of buffer status report tables that is currently in use.
  • the various exemplary embodiments may be imple ⁇ mented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the exemplary embodiments of this invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non- limiting examples, hardware, software, firmware, special pur- pose circuits or logic, general purpose hardware or control ⁇ ler or other computing devices, or some combination thereof.
  • the exemplary embodiments of the inventions may be practiced in various components such as integrated circuit chips and modules, and that the exemplary embodiments of this invention may be realized in an apparatus that is embodied as an inte ⁇ grated circuit.
  • the integrated circuit, or circuits may com ⁇ prise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this invention .
  • the exemplary embodiments have been de- scribed above in the context of the LTE-A system, it should be appreciated that the exemplary embodiments of this inven ⁇ tion are not limited for use with only this particular types of wireless communication system and that they may be used to advantage in other wireless communication systems, such as systems where component aggregation is employed.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may en ⁇ compass the presence of one or more intermediate elements be ⁇ tween two elements that are "connected” or “coupled” to ⁇ gether.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the micro ⁇ wave region and the optical (both visible and invisible) re ⁇ gion, as several non-limiting and non-exhaustive examples.
  • electromagnetic energy such as electromagnetic energy having wavelengths in the radio frequency region, the micro ⁇ wave region and the optical (both visible and invisible) re ⁇ gion, as several non-limiting and non-exhaustive examples.

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Abstract

In one exemplary aspect of this invention a method includes buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where the threshold value is a function of the capacity of a currently allocated uplink data transmission resource and some certain amount of time. In another exemplary embodiment the triggering of the generation of the buffer status report and the sending of the buffer status report to a network access node occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plurality of buffer status report tables that is currently in use.

Description

DESCRIPTION Title DYNAMIC BUFFER STATUS REPORT SELECTION FOR CARRIER AGGREGATION
TECHNICAL FIELD: The exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer programs and, more specifically, relate to techniques to formulate reports for a network access ele¬ ment, where the reports are indicative of an amount of data that is buffered in a user equipment.
BACKGROUND :
This section is intended to provide a background or context to the invention that is recited in the claims. The descrip¬ tion herein may include concepts that could be pursued, but are not necessarily ones that have been previously conceived, implemented or described. Therefore, unless otherwise indi¬ cated herein, what is described in this section is not prior art to the description and claims in this application and is not admitted to be prior art by inclusion in this section.
The following abbreviations that may be found in the specifi¬ cation and/or the drawing figures are defined as follows:
3GPP third generation partnership project
BS base station
BSR buffer status report
BW bandwidth CA carrier aggregation
CC component carrier
CE control element
CQI channel quality indicator
DL downlink (eNB towards UE)
eNB E-UTRAN Node B (evolved Node B)
EPC evolved packet core
E-UTRAN evolved UTRAN (LTE)
IMTA international mobile telecommunications asso- ciation
ITU-R international telecommunication union- radiocommunication sector
LCG logical channel group
LTE long term evolution of UTRAN (E-UTRAN)
LTE-A LTE advanced
MAC medium access control (layer 2, L2)
MCS modulation coding scheme
MIMO multiple input / multiple output
MM/MME mobility management/mobility management entity NodeB base station
OFDMA orthogonal frequency division multiple access
OAM operations and maintenance
PDCCH physical downlink control channel
PDCP packet data convergence protocol
PDU protocol data unit
PHR power headroom report
PHY physical (layer 1, LI)
Rel release
RLC radio link control
RLF radio link failure
RRC radio resource control
RRM radio resource management
SC-FDMA single carrier, frequency division multiple access SCH shared channel
SGW serving gateway
TTI transmission time interval
UE user equipment, such as a mobile station, mo- bile node or mobile terminal
UL uplink (UE towards eNB)
UTRAN universal terrestrial radio access network
One modern communication system is known as evolved UTRAN (E- UTRAN, also referred to as UTRAN-LTE or as E-UTRA) . The DL access technique is OFDMA, and the UL access technique is SC- FDMA .
One specification of interest is 3GPP TS 36.300, V8.11.0 (2009-12), "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Ter¬ restrial Access Network (EUTRAN) ; Overall description; Stage 2 (Release 8)," incorporated by reference herein in its en- tirety. This system may be referred to for convenience as LTE Rel-8. In general, the set of specifications given generally as 3GPP TS 36.xyz (e.g., 36.211, 36.311, 36.312, etc.) may be seen as describing the Release 8 LTE system. More recently, Release 9 versions of at least some of these specifications have been published including 3GPP TS 36.300, V9.1.0 (2009- 9) .
Figure 1A reproduces Figure 4.1 of 3GPP TS 36.300 V8.11.0, and shows the overall architecture of the EUTRAN system (Rel- 8) . The E-UTRAN system 2 includes eNBs, providing the E-UTRAN user plane ( PDCP/RLC/MAC/PHY) and control plane (RRC) proto¬ col terminations towards the UE (not shown) . The eNBs are in¬ terconnected with each other by means of an X2 interface. The eNBs are also connected by means of an SI interface to an EPC, more specifically to a MME by means of a SI MME inter¬ face and to an S-GW by means of a SI interface (MME/S-GW 4) . The SI interface supports a many-to-many relationship between MMEs / S-GWs and eNBs .
The eNB hosts the following functions:
functions for RRM: RRC, Radio Admission Control, Connection Mobility Control, dynamic allocation of resources to UEs in both UL and DL (scheduling) ;
IP header compression and encryption of the user data stream; selection of a MME at UE attachment;
routing of User Plane data towards the EPC (MME/S-GW) ;
scheduling and transmission of paging messages (originated from the MME) ;
scheduling and transmission of broadcast information (originated from the MME or OAM) ; and
a measurement and measurement reporting configuration for mo¬ bility and scheduling. Also of interest herein are the further releases of 3GPP LTE (e.g., LTE Rel-10) targeted towards future IMTA systems, re¬ ferred to herein for convenience simply as LTE-Advanced (LTE- A) . Reference in this regard may be made to 3GPP TR 36.913, V9.1.0 (2009-12), 3rd Generation Partnership Project; Techni- cal Specification Group Radio Access Network; Requirements for Further Advancements for EUTRA (LTE-Advanced) (Release 9), incorporated by reference herein. A goal of LTE-A is to provide significantly enhanced services by means of higher data rates and lower latency with reduced cost. LTE-A is di- rected toward extending and optimizing the 3GPP LTE Rel-8 ra¬ dio access technologies to provide higher data rates at lower cost. LTE-A will be a more optimized radio system fulfilling the ITU-R requirements for IMT-Advanced while keeping back¬ wards compatibility with LTE Rel-8. As is specified in 3GPP TR 36.913, LTE-A should operate in spectrum allocations of different sizes, including wider spectrum allocations than those of LTE Rel-8 (e.g., up to 100MHz) to achieve the peak data rate of lOOMbit/s for high mobility and 1 Gbit/s for low mobility. It has been agreed that carrier aggregation is to be considered for LTE-A in order to support bandwidths larger than 20 MHz. Carrier aggre¬ gation, where two or more component carriers (CCs) are aggre- gated, is considered for LTE-A in order to support transmis¬ sion bandwidths larger than 20MHz. The carrier aggregation could be contiguous or non-contiguous. This technique, as a bandwidth extension, can provide significant gains in terms of peak data rate and cell throughput as compared to non- aggregated operation as in LTE Rel-8.
A terminal may simultaneously receive one or multiple compo¬ nent carriers depending on its capabilities. A LTE-A terminal with reception capability beyond 20 MHz can simultaneously receive transmissions on multiple component carriers. A LTE Rel-8 terminal can receive transmissions on a single compo¬ nent carrier only, provided that the structure of the compo¬ nent carrier follows the Rel-8 specifications. Moreover, it is required that LTE-A should be backwards compatible with Rel-8 LTE in the sense that a Rel-8 LTE terminal should be operable in the LTE-A system, and that a LTE-A terminal should be operable in a Rel-8 LTE system.
Figure IB shows an example of CA, where M Rel-8 component carriers are combined together to form HRel-8 BW (e.g. 5 H 20MHz = 100MHz given M = 5) . Rel-8 terminals receive/transmit on one CC, whereas LTE-A terminals may receive/transmit on multiple CCs simultaneously to achieve higher (wider) band- widths . Basically, in CA it is possible to configure a UE to aggre¬ gate a different number of CCs originating from the same eNB, of possibly different BWs, in the UL and the DL . Rel-8 UEs are assumed to be served by a single stand-alone CC, while Release 10 (LTE-A) terminals can be configured to receive or transmit simultaneously on multiple aggregated CCs in the same TTI . As is currently specified for LTE, one subframe is equal to one millisecond, and comprises two 0.5 millisecond slots.
In addition, configured CCs can be de-activated in order to reduce the UE power consumption. In this case the UE monitor- ing activity of a de-activated carrier is reduced (e.g., no PDCCH monitoring and CQI measurements are needed) . This mechanism can be referred to as carrier activation/de- activation . Furthermore, to assist the eNB scheduler functionality the eNB can configure UEs to send BSRs and PHRs in the UL . Refer¬ ence in this regard can be made to 3GPP TS 36.321 V9.1.0 (2009-12) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification (Release 9) , such as in Section 5.4.5 "Buffer Status Reporting" and Section 5.4.6 "Power Headroom Reporting". The BSR indicates the amount of data the UE has available for transmission, while the PHR provides the eNB with information about the difference between the nominal UE maximum transmit power and the estimated power for UL-SCH transmission. BSRs are typically used by the eNB to select an appropriate trans- port block size, while PHRs are typically used to select an appropriate MCS .
BSRs are sent by the UE in the UL in the form of Buffer Status Report MAC Control Elements (see 3GPP TS 36.321, Sec¬ tion 6.1.3.1, "Buffer Status Report MAC Control Elements") in which the Buffer Size (BS) field identifies the total amount of data available for transmission. The length of this field is specified as 6 bits and contains exponentially distributed buffer size levels based on a minimum buffer size level (Bmin ) t a maximum buffer size level (Bmax) and a number of reported buffer size levels (N) .
Reference can be made, for example, to R2-083101, "Buffer Size Levels for BSR in E-UTRA Uplink", 3GPP TSG-RAN WG2 Meeting #62bis, Warsaw, Poland, 30 June-4 July 2008, Source: Ericsson, Nokia Corporation, Nokia Siemens Networks, Samsung.
Figure 3A herein reproduces Figure 6.1.3.1-1 of 3GPP TS 36.321 and shows a Short BSR and Truncated BSR MAC control element, Figure 3B herein reproduces Figure 6.1.3.1-2 of 3GPP TS 36.321 and shows a Long BSR MAC control element, and Fig¬ ure 3C herein reproduces Table 6.1.3.1-1 of 3GPP TS 36.321 and shows buffer size levels for BSR.
As is stated in 3GPP TS 36.321, Section 6.1.3.1, Buffer Status Report (BSR) MAC control elements consist of either the Short BSR and Truncated BSR format, with one LCG ID field and one corresponding buffer Size field (see Figure 3A herein) or the Long BSR format having four buffer size fields, corresponding to LCG IDs #0 through #3 (see Figure 3B herein) . In a conventional sense the LCG is understood to be a group of UL logical channels for which a single joint buffer fill level is reported by the UE in a BSR. The mapping of logical channels to LCGs is defined by the eNodeB. The BSR formats are identified by MAC PDU subheaders with LCIDs as specified in table 6.2.1-2 (Figure 3D herein) . The fields LCG ID and Buffer Size are defined as follows. LCG ID: The Logi- cal Channel Group ID field identifies the group of logical channel (s) for which buffer status is being reported. The length of the field is 2 bits. Buffer Size: The Buffer Size field identifies the total amount of data available across all logical channels of a logical channel group after the MAC PDU has been built. The amount of data is indicated as the number of bytes. It includes all data that is available for transmission in the RLC layer and in the PDCP layer. The size of the RLC and MAC headers are not considered in the buffer size computation. The length of this field is 6 bits. The values taken by the Buffer Size field are shown in Table 6.1.3.1-1 (Figure 3C herein).
However, the BS field as specified for LTE Rel-8 and Rel-9 is based on the assumption that only one CC is used in the UL and, as a result, is not adequate for use with the higher data rates made possible by the use of CA in Rel-10 and be¬ yond .
SUMMARY
The foregoing and other problems are overcome, and other ad¬ vantages are realized, by the use of the exemplary embodi¬ ments of this invention. In a first aspect thereof the exemplary embodiments of this invention provide a method that comprises buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status re- port to a network access node, where the threshold value is a function of the capacity of a currently allocated uplink data transmission resource and some certain amount of time. In another aspect thereof the exemplary embodiments of this invention provide an apparatus that comprises a processor and a memory including computer program code. The memory and computer program code are configured to, with the processor, cause the apparatus at least to perform buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status re¬ port to a network access node, where the threshold value is a function of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
In another aspect thereof the exemplary embodiments of this invention provide a method that comprises buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status re¬ port to a network access node, where triggering the genera¬ tion of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plu¬ rality of buffer status report tables that is currently in use .
In a still further aspect thereof the exemplary embodiments of this invention provide an apparatus that comprises a proc¬ essor and a memory including computer program code. The memory and computer program code are configured to, with the processor, cause the apparatus at least to perform, buffering data in a user equipment and, in response to an amount of buffered data exceeding a threshold value, triggering the generation of a buffer status report and the sending of the buffer status report to a network access node. The triggering the generation of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plurality of buffer status report tables that is currently in use. BRIEF DESCRIPTION OF THE DRAWINGS In the attached Drawing Figures:
Figure 1A reproduces Figure 4.1 of 3GPP TS 36.300, and shows the overall architecture of the EUTRAN system.
Figure IB shows an example of carrier aggregation as proposed for the LTE-A system. Figure 2 shows a simplified block diagram of various elec¬ tronic devices that are suitable for use in practicing the exemplary embodiments of this invention.
Figure 3A reproduces Figure 6.1.3.1-1 of 3GPP TS 36.321 and shows a Short BSR and Truncated BSR MAC control element, Fig¬ ure 3B reproduces Figure 6.1.3.1-2 of 3GPP TS 36.321 and shows a Long BSR MAC control element, Figure 3C reproduces Table 6.1.3.1-1 of 3GPP TS 36.321 and shows Buffer size lev¬ els for BSR, and Figure 3D reproduces Table 6.2.1-21 of 3GPP TS 36.321 and shows values of the LCID for the UL-SCH.
Figure 4 shows the format of a MAC R/R/E/LCID sub-header, and reproduces Figure 6.1.2-2 of 3GPP TS 36.321. Figure 5 is a logic flow diagram that illustrates the opera¬ tion of a method, and a result of execution of computer pro¬ gram instructions embodied on a computer readable memory, in accordance with the exemplary embodiments of this invention.
Figure 6 is a logic flow diagram that illustrates the opera¬ tion of a method, and a result of execution of computer pro¬ gram instructions embodied on a computer readable memory, further in accordance with the exemplary embodiments of this invention.
DETAILED DESCRIPTION
The exemplary embodiments of this invention relate generally to mobile wireless communication, such as 3GPP LTE-A. The ex¬ emplary embodiments of this invention relate more specifi¬ cally to the UL buffer size and the reporting of same. As was noted above, the BSR as defined in Rel-8 and Rel-9 supports a maximum buffer size of 150,000 bytes (see Figure 3C) . The ex- emplary embodiments of this invention address and solve this problem for the case of CA where significantly higher UL data rates can be supported.
Before describing in further detail the exemplary embodiments of this invention, reference is made to Figure 2 for illus¬ trating a simplified block diagram of various electronic de¬ vices and apparatus that are suitable for use in practicing the exemplary embodiments of this invention. In Figure 2 a wireless network 1 is adapted for communication over a wire- less link 11 with an apparatus, such as a mobile communica¬ tion device which may be referred to as a UE 10, via a net¬ work access node, such as a Node B (base station) , and more specifically an eNB 12. The network 1 may include a network control element (NCE) 14 that may include the MME/SGW func- tionality shown in Figure 1A, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the internet) . The UE 10 includes a controller, such as at least one computer or a data processor (DP) 10A, a non-transitory computer-readable memory medium embodied as a memory (MEM) 10B that stores a program of computer instructions (PROG) IOC, and a suitable radio frequency (RF) transceiver 10D for bidirectional wire¬ less communications with the eNB 12 via one or more antennas. The eNB 12 also includes a controller, such as at least one computer or a data processor (DP) 12A, a computer-readable memory medium embodied as a memory (MEM) 12B that stores a program of computer instructions (PROG) 12C, and a suitable RF transceiver 12D for communication with the UE 10 via one or more antennas (typically several when MIMO operation is in use) . The eNB 12 is coupled via a data / control path 13 to the NCE 14. The path 13 may be implemented as the SI inter¬ face shown in Figure 1A. The eNB 12 may also be coupled to another eNB via data / control path 15, which may be imple- mented as the X2 interface shown in Figure 1A.
For the purposes of describing the exemplary embodiments of this invention the UE 10 can be assumed to also include a MAC function or module 10E, and the memory 10B can be assumed to include one or more data buffers 10F. The memory 10B can also store one or more buffer size tables. The eNB 12 can be as¬ sumed to include a corresponding MAC function or module 12E. In one exemplary embodiment the MAC modules 10E, 12E can be compatible with, and configured to operate using, the MAC procedures defined in 3GPP TS 36.321, as extended and en¬ hanced in accordance with the exemplary embodiments of this invention . The PROGs IOC and 12C are assumed to include program instruc¬ tions that, when executed by the associated DP, enable the device to operate in accordance with the exemplary embodi¬ ments of this invention, as will be discussed below in greater detail. That is, the exemplary embodiments of this invention may be implemented at least in part by computer software executable by the DP 10A of the UE 10 and/or by the DP 12A of the eNB 12, or by hardware, or by a combination of software and hardware (and firmware) .
In general, the various embodiments of the UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabili- ties, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and play¬ back appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incor¬ porate combinations of such functions.
The computer-readable MEMs 10B and 12B may be of any type suitable to the local technical environment and may be imple- mented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and sys¬ tems, fixed memory and removable memory. The DPs 10A and 12A may be of any type suitable to the local technical environ- ment, and may include one or more of general purpose com¬ puters, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multi-core processor architectures, as non-limiting examples. Described now in further detail are several aspects of the exemplary embodiments of this invention.
In a first aspect of the exemplary embodiments there are in- troduced a plurality of buffer size level tables tailored for different maximum uplink data rates. For example one buffer size table can be provided with a maximum of 150,000 bytes, thus corresponding to the same UL data rate as in Rel-8 and Rel-9. This first table may be identical to the table shown in Figure 3. A second table with a maximum of 300,000 bytes, corresponding to twice the UL data rate of Rel-8 and Rel-9, can also be provided to cover the case of, for example, the aggregation of two CCs in the UL . In a similar manner a third buffer size table with a maximum of 450,000 bytes, corre- sponding to three times the UL data rate of Rel-8 and Rel-9, can also be provided to cover the case of, for example, the aggregation of three CCs in the UL .
In a second aspect of the exemplary embodiments, and when building / composing an UL BSR MAC Control Element, the MAC function 10E of the UE 10 dynamically selects the buffer size level table to be used based on the amount of data buffered. The UE 10 selects one of the tables according to the amount of data it has buffered, e.g., the UE 10 selects the table with a minimum Bmax that does not exceed its current buffer status (i.e., the table with the finest granularity) . The UE 10 can then indicate to the eNB 12 which table is used via, for example, two R (reserved) bits in the MAC header for BSR (see the R/R/E/LCID sub-header shown in Figure 4) . All LCGs use the same BSR table in the Long BSR which is selected ac¬ cording to the LCG with the most data buffered (or alterna¬ tively according to the LCG that has triggered the BSR) . In a third aspect of the exemplary embodiments of this inven¬ tion there is introduced a threshold-based BSR trigger, with the threshold being implicitly deduced by the buffer exceed¬ ing what can be supported by currently configured or allo- cated resource (s) within some certain time. The time can be configurable or it can be fixed so as to be the same as the response time (e.g., 16 TTIs used for calculating the maximum level for the BSR table) . The threshold may be per LCG, e.g., the BSR is triggered when the buffer of a LCG exceeds the threshold such that another BSR table is to be used (i.e., the buffer exceeds the value of Bmax of the BSR table cur¬ rently in use) . Alternatively, the threshold value can be di¬ rectly configurable by the eNB 12 in DL signaling. In accordance with the exemplary embodiments the buffer size tables can be generated with different Bmax values and expo¬ nentially distributed buffer size levels. Bmax is determined by the number of configured / activated UL CCs and / or whether UL MIMO is configured for each CC . For example, Bmax for two UL CCs can be twice as large as for a single UL CC . The buffer size levels can be calculated in the same manner as in Rel-8: i.e., Bk =
Figure imgf000016_0001
(1 + p) k Ί, where p = ( Bmax / Bm±n) 1 <w_1) - 1, k is the index, N is maximum index (62 in this example with 6 bits for BS and one value reserved for an empty buffer), Bmin = 10 bytes.
With, for example, the two R bits in the MAC BSR header (see again Figure 4), up to four pre-defined tables can be sup¬ ported and identified to the eNB 12, where each BRS table has a different Bmax value. The Bmax values can be determined by the data rate supported with different numbers of UL CC and / or with UL MIMO, and Bk calculated the same way as in the first aspect discussed above. For an implicit threshold, and by example, when one CC is configured for the UE 10 the BSR is triggered when the buffer status exceeds 150Kbytes, which is the maximum value can be supported with one CC within a 16 TTI response time. Alterna- tively, when the allocated resource is 100Kbyte for a certain TTI, BSR is triggered if the buffer exceeds lOOKbytes times some certain time (e.g., 16 TTI or some configurable time), which means BSR is triggered when the buffer cannot be emp¬ tied with the currently allocated UL resource within the specified time (e.g., with 16 TTI) .
For the per LCG threshold, and by example assuming the BSR table used in previous BSRs is Bmax = 150Kbytes, then BSR is triggered when the data buffer of a LCG exceeds 150kbytes, and another BSR table is to be used.
It should be appreciated that the exemplary embodiments of this invention can be implemented in a variety of different forms. For example, it is also within the scope of the exem- plary embodiments to take the operation of UL MIMO into ac¬ count. As such, the BSR tables are not necessarily linked only to the number of CCs in use. As one non-limiting example, the UE 10 may store two BSR tables, with one table iden¬ tical to (or substantially identical to) the table used for Rel-8 (e.g., see Figure 3C) , and a second table composed so as to cover the use case of five UL CCs plus UL MIMO.
As can be appreciated, a number of technical effects are re¬ alized by the use of the exemplary embodiments. For example, more accurate UL buffer information is provided for the eNB 12 to enable more efficient scheduling and a better determination as to whether more UL CC(s) need to be configured / activated, or whether some existing UL CC should be de- configured / deactivated. The BSR format need not change from what is already specified for Rel-8 and Rel-9, and thus the impact on the MAC protocol is minimized, i.e., 6 bits are still used for the BS for a LCG with a MAC header to indicate that it is a BSR MAC control element (CE) .
Based on the foregoing it should be apparent that the exem¬ plary embodiments of this invention provide a method, appara¬ tus and computer program (s) to enhance the reporting of the amount of buffered data in the UE 10 to the eNB 12.
Figure 5 is a logic flow diagram that illustrates the opera¬ tion of a method, and a result of execution of computer pro¬ gram instructions, in accordance with the exemplary embodi¬ ments of this invention. In accordance with these exemplary embodiments a method performs, at Block 5A, a step of buffer¬ ing data in a user equipment. In block 5B there is a step, performed in response to an amount of buffered data exceeding a threshold value, of triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where the threshold value is a func¬ tion of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
In accordance with the foregoing method, where the uplink data transmission resource comprises one or more component carriers, and where the capacity increases as the number of component carriers increases.
In accordance with the foregoing method, where the time is expressed in transmission time intervals (TTIs) .
In accordance with the foregoing method, where the threshold value is per logical channel group. In accordance with the foregoing method, where the threshold value is related to a maximum amount of buffered data sup¬ ported by a buffer status table that is currently in use by the user equipment.
In accordance with the foregoing method, where the threshold value is related to a maximum amount of time that is avail¬ able during which the buffered data can be transmitted to the network access node using the currently allocated uplink data transmission resource.
In accordance with the foregoing method, where the uplink data transmission resource comprises one or more component carriers, where the capacity increases as the number of com- ponent carriers increases, and where the time is expressed in transmission time intervals.
In accordance with the foregoing method, where the user equipment stores a plurality of buffer status report tables, individual ones of which correspond to an individual one of a number of component carriers allocated to the user equipment for transmitting data on the uplink.
In accordance with the foregoing method, where the user equipment stores a plurality of buffer status report tables, where each of the plurality of buffer status report tables has a different maximum value and granularity.
In accordance with the foregoing method, where the user equipment stores a plurality of buffer status report tables, and where at least one of the plurality of buffer status re¬ port tables is composed in consideration of a number of up¬ link component carriers in use and in consideration of uplink multiple input / multiple output operation. In accordance with the foregoing method, where triggering the generation of a buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plu¬ rality of buffer status report tables that is currently in use .
In accordance with the foregoing method as explained in the preceding paragraph, where the user equipment selects the buffer status report table that is currently in use according to an amount of buffered data by selecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
In accordance with the foregoing method as explained in the preceding paragraph, and further comprising identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report header.
In accordance with the foregoing method, performed as a re¬ sult of execution of computer program instructions stored in a non-transitory computer-readable medium that comprises part of the user equipment.
Figure 6 is a logic flow diagram that illustrates the opera¬ tion of a method, and a result of execution of computer pro¬ gram instructions, further in accordance with the exemplary embodiments of this invention. In accordance with these exem¬ plary embodiments a method performs, at Block 6A, a step of buffering data in a user equipment. At Block 6B there is a step performed, in response to an amount of buffered data ex¬ ceeding a threshold value, of triggering the generation of a buffer status report and the sending of the buffer status re¬ port to a network access node, where triggering the genera¬ tion of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plu¬ rality of buffer status report tables that is currently in use .
In accordance with the foregoing method, where the user equipment selects the buffer status report table that is cur¬ rently in use according to an amount of buffered data by se¬ lecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
In accordance with the foregoing method, and further compris¬ ing identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report header.
In accordance with the foregoing method, where the medium ac¬ cess control buffer status report header also identifies the particular logical channel group. The various blocks shown in Figures 5 and 6 may be viewed as method steps, and/or as operations that result from operation of computer program code, and/or as a plurality of coupled logic circuit elements constructed to carry out the associ¬ ated function (s) . That is, also encompassed by these exem- plary embodiments are apparatus that are configured to oper¬ ate so as to execute the exemplary methods described above with respect to Figure 5 and 6. Also encompassed by these exemplary embodiments is an appara¬ tus, such as a network access node (e.g., the eNB 12), that is configured to respond to and interpret the BSRs received on the UL from the UE 10.
The exemplary embodiments also pertain to an apparatus that comprises means for buffering data in a user equipment and means, responsive to an amount of buffered data exceeding a threshold value, for triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where the threshold value is a func¬ tion of the capacity of a currently allocated uplink data transmission resource and some certain amount of time. The exemplary embodiments also pertain to an apparatus that comprises means for buffering data in a user equipment and means, responsive to an amount of buffered data exceeding a threshold value, for triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where triggering the generation of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plurality of buffer status report tables that is currently in use.
In general, the various exemplary embodiments may be imple¬ mented in hardware or special purpose circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. While various aspects of the exemplary embodiments of this invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non- limiting examples, hardware, software, firmware, special pur- pose circuits or logic, general purpose hardware or control¬ ler or other computing devices, or some combination thereof.
It should thus be appreciated that at least some aspects of the exemplary embodiments of the inventions may be practiced in various components such as integrated circuit chips and modules, and that the exemplary embodiments of this invention may be realized in an apparatus that is embodied as an inte¬ grated circuit. The integrated circuit, or circuits, may com¬ prise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this invention .
Various modifications and adaptations to the foregoing exem¬ plary embodiments of this invention may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings. However, any and all modifications will still fall within the scope of the non-limiting and exemplary embodiments of this invention.
For example, while the exemplary embodiments have been de- scribed above in the context of the LTE-A system, it should be appreciated that the exemplary embodiments of this inven¬ tion are not limited for use with only this particular types of wireless communication system and that they may be used to advantage in other wireless communication systems, such as systems where component aggregation is employed.
It should be noted that the terms "connected, " "coupled, " or any variant thereof, mean any connection or coupling, either direct or indirect, between two or more elements, and may en¬ compass the presence of one or more intermediate elements be¬ tween two elements that are "connected" or "coupled" to¬ gether. The coupling or connection between the elements can be physical, logical, or a combination thereof. As employed herein two elements may be considered to be "connected" or "coupled" together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the micro¬ wave region and the optical (both visible and invisible) re¬ gion, as several non-limiting and non-exhaustive examples.
Further, the various names used for the described parameters, channels and message elements are not intended to be limiting in any respect, as these parameters, channels and message elements may be identified by any suitable names.
Furthermore, some of the features of the various non-limiting and exemplary embodiments of this invention may be used to advantage without the corresponding use of other features. As such, the foregoing description should be considered as merely illustrative of the principles, teachings and exem¬ plary embodiments of this invention, and not in limitation thereof.

Claims

CLAIMS What is claimed is:
1. A method, comprising: buffering data in a user equipment; and in response to an amount of buffered data exceeding a thresh¬ old value, triggering the generation of a buffer status re- port and the sending of the buffer status report to a network access node, where the threshold value is a function of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
2. The method of claim 1, where the uplink data transmission resource comprises one or more component carriers, and where the capacity increases as the number of component carriers increases .
3. The method of claim 1, where the time is expressed in transmission time intervals.
4. The method of any one of the preceding claims, where the threshold value is per logical channel group.
5. The method as in claim 4, where the threshold value is re¬ lated to a maximum amount of buffered data supported by a buffer status table that is currently in use by the user equipment .
6. The method of claim 1, where triggering the generation of a buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plurality of buffer status report tables that is currently in use.
7. The method of claim 1, where the threshold value is re- lated to a maximum amount of time that is available during which the buffered data can be transmitted to the network ac¬ cess node using the currently allocated uplink data transmis¬ sion resource.
8. The method of claim 7, where the uplink data transmission resource comprises one or more component carriers, where the capacity increases as the number of component carriers in¬ creases, and where the time is expressed in transmission time intervals .
9. The method of claim 1, where the user equipment stores a plurality of buffer status report tables, individual ones of which correspond to an individual one of a number of compo¬ nent carriers allocated to the user equipment for transmit- ting data on the uplink.
10. The method of claim 1, where the user equipment stores a plurality of buffer status report tables, where each of the plurality of buffer status report tables has a different maximum value and granularity.
11. The method of claim 1, where the user equipment stores a plurality of buffer status report tables, and where at least one of the plurality of buffer status report tables is com- posed in consideration of a number of uplink component carriers in use and in consideration of uplink multiple input / multiple output operation.
12. The method of claim 6, where the user equipment selects the buffer status report table that is currently in use ac¬ cording to an amount of buffered data by selecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
13. The method of claim 12, further comprising identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report header.
14. The method as in any one of the preceding claims, per¬ formed as a result of execution of computer program instruc¬ tions stored in a non-transitory computer-readable medium that comprises part of the user equipment.
15. An apparatus, comprising: a processor; and a memory including computer program code, where the memory and computer program code are configured to, with the proces¬ sor, cause the apparatus at least to perform, buffering data in a user equipment; and in response to an amount of buffered data exceeding a thresh¬ old value, triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where the threshold value is a function of the capacity of a currently allocated uplink data transmission resource and some certain amount of time.
16. The apparatus of claim 15, where the uplink data trans¬ mission resource comprises one or more component carriers, and where the capacity increases as the number of component carriers increases.
17. The apparatus of claim 15, where the time is expressed in transmission time intervals.
18. The apparatus of any one of the preceding claims, where the threshold value is per logical channel group.
19. The apparatus as in claim 18, where the threshold value is related to a maximum amount of buffered data supported by a buffer status table that is currently in use by the user equipment.
20. The apparatus of claim 15, where triggering the genera¬ tion of a buffer status report occurs when an amount of buff¬ ered data in a buffer of a particular logical channel group exceeds a maximum value associated with one of a plurality of buffer status report tables that is currently in use.
21. The apparatus of claim 15, where the threshold value is related to a maximum amount of time that is available during which the buffered data can be transmitted to the network ac¬ cess node using the currently allocated uplink data transmis¬ sion resource.
22. The apparatus of claim 21, where the uplink data trans- mission resource comprises one or more component carriers, where the capacity increases as the number of component car¬ riers increases, and where the time is expressed in transmis¬ sion time intervals.
23. The apparatus of claim 15 where the user equipment stores a plurality of buffer status report tables, individual ones of which correspond to an individual one of a number of com¬ ponent carriers allocated to the user equipment for transmit- ting data on the uplink.
24. The apparatus of claim 15, where the user equipment sto¬ res a plurality of buffer status report tables, where each of the plurality of buffer status report tables has a different maximum value and granularity.
25. The apparatus of claim 15, where the user equipment sto¬ res a plurality of buffer status report tables, and where at least one of the plurality of buffer status report tables is composed in consideration of a number of uplink component carriers in use and in consideration of uplink multiple input / multiple output operation.
26. The apparatus of claim 20, where the user equipment se- lects the buffer status report table that is currently in use according to an amount of buffered data by selecting the buf¬ fer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
27. The apparatus of claim 26, further comprising identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report header.
28. A method, comprising: buffering data in a user equipment; and in response to an amount of buffered data exceeding a thresh¬ old value, triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where triggering the generation of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maxi¬ mum value associated with one of a plurality of buffer status report tables that is currently in use.
29. The method of claim 28, where the user equipment selects the buffer status report table that is currently in use ac¬ cording to an amount of buffered data by selecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
30. The method of claim 29, further comprising identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report header.
31. The method of claim 30, where the medium access control buffer status report header also identifies the particular logical channel group.
32. An apparatus, comprising: a processor; and a memory including computer program code, where the memory and computer program code are configured to, with the proces¬ sor, cause the apparatus at least to perform, buffering data in a user equipment; and in response to an amount of buffered data exceeding a thresh¬ old value, triggering the generation of a buffer status report and the sending of the buffer status report to a network access node, where triggering the generation of the buffer status report occurs when an amount of buffered data in a buffer of a particular logical channel group exceeds a maxi¬ mum value associated with one of a plurality of buffer status report tables that is currently in use.
33. The apparatus of claim 32, where the user equipment se¬ lects the buffer status report table that is currently in use according to an amount of buffered data by selecting the buf¬ fer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
34. The apparatus of claim 33, further comprising identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report header, where the medium access control buffer status report header also identifies the particular logical channel group.
35. A method, comprising: buffering data in a user equipment; and storing in the user equipment a plurality of buffer status report tables, where each of the plurality of buffer status report tables has a different maximum value and granularity.
36. The method of claim 35, further comprising: generating a buffer status report for the buffered data in accordance with a selected one of the plurality of buffer status report ta- bles; and sending the generated buffer status report to a network access node.
37. The method of claim 35, further comprising: selecting, by the user equipment, a buffer status report table from the plurality of buffer status report tables for use.
38. The method of claim 37, where the user equipment selects the buffer status report table that is currently in use ac- cording to an amount of buffered data by selecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
39. The method of claim 37, further comprising: identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report header.
40. The method of claim 35, where at least one of the plural- ity of buffer status report tables is composed in considera¬ tion of a number of uplink component carriers in use and in consideration of uplink multiple input / multiple output op¬ eration .
41. The method of claim 35, where the plurality of buffer status report tables comprises a first buffer status report table configured for use with an uplink data rate in accor¬ dance with a Release 8 or Release 9 evolved universal terres¬ trial radio access network and a second buffer status report table composed so as to cover a use case of five uplink com¬ ponent carriers and uplink multiple input / multiple output operation .
42. The method of any one of claims 35-41, performed as a re¬ sult of execution of computer program instructions stored in a non-transitory computer-readable medium that comprises part of the user equipment.
43. An apparatus, comprising: a processor; and a memory including computer program code, where the memory and computer program code are configured to, with the proces¬ sor, cause the apparatus at least to perform, buffering data; and storing a plurality of buffer status report tables, where each of the plurality of buffer status report tables has a different maximum value and granularity.
44. The apparatus of claim 35, the memory and computer pro¬ gram code being configured to, with the processor, cause the apparatus to further perform: generating a buffer status report for the buffered data in accordance with a selected one of the plurality of buffer status report tables; and sending the generated buffer status report to a network access node.
45. The apparatus of claim 35, the memory and computer pro¬ gram code being configured to, with the processor, cause the apparatus to further perform: selecting a buffer status re- port table from the plurality of buffer status report tables for use.
46. The apparatus of claim 45, where the apparatus selects the buffer status report table that is currently in use ac- cording to an amount of buffered data by selecting the buffer status report table that has the smallest maximum value that does not exceed the amount of currently buffered data.
47. The apparatus of claim 45, the memory and computer pro¬ gram code being configured to, with the processor, cause the apparatus to further perform: identifying the selected buffer status report table to the network access node using at least one bit in a medium access control buffer status report hea- der.
48. The apparatus of claim 35, where at least one of the plu¬ rality of buffer status report tables is composed in consid¬ eration of a number of uplink component carriers in use and in consideration of uplink multiple input / multiple output operation .
PCT/EP2011/055107 2010-04-02 2011-04-01 Dynamic buffer status report selection for carrier aggregation WO2011121112A1 (en)

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CN201180027002.4A CN102907161B (en) 2010-04-02 2011-04-01 Dynamic buffering state report for carrier aggregation is selected
KR1020127028772A KR101412187B1 (en) 2010-04-02 2011-04-01 Dynamic buffer status report selection for carrier aggregation
US13/638,985 US9019818B2 (en) 2010-04-02 2011-04-01 Dynamic buffer status report selection for carrier aggregation
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