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WO2013104119A1 - Conception de canal de commande pour utilisateurs à faible bande passante - Google Patents

Conception de canal de commande pour utilisateurs à faible bande passante Download PDF

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Publication number
WO2013104119A1
WO2013104119A1 PCT/CN2012/070236 CN2012070236W WO2013104119A1 WO 2013104119 A1 WO2013104119 A1 WO 2013104119A1 CN 2012070236 W CN2012070236 W CN 2012070236W WO 2013104119 A1 WO2013104119 A1 WO 2013104119A1
Authority
WO
WIPO (PCT)
Prior art keywords
control signaling
frequency
candidate resources
pdcch
hopping
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2012/070236
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English (en)
Inventor
Chunyan Gao
Shuang TAN
Na WEI
Jing HAN
Wei Bai
Haiming Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renesas Electronics Corp
Original Assignee
Renesas Mobile Corp
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 Renesas Mobile Corp filed Critical Renesas Mobile Corp
Priority to PCT/CN2012/070236 priority Critical patent/WO2013104119A1/fr
Publication of WO2013104119A1 publication Critical patent/WO2013104119A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/0012—Hopping in multicarrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7143—Arrangements for generation of hop patterns

Definitions

  • 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 arranging a control channel such that a user equipment's resource allocations lie only within a narrow bandwidth yet still have some frequency diversity for robustness.
  • a typical narrow bandwidth in which low cost MTC devices operate is about 1.4 MHz. With such a narrow bandwidth it is not desirable to assign too many PRBs else the control channel overhead becomes too high. For example, reserving 2 PRBs for E-PDCCH in a 1.4MHz bandwidth will count for one third of the overhead. But reserving only one PRB for E-PDCCH sacrifices frequency diversity gain.
  • E-PDCCH Since the E-PDCCH is located in the PDSCH region, the position and region size of the E-PDCCH depends on the number of OFDM symbols used for normal PDCCH in the same subframe. The number of PDCCH symbols is indicated by the PCFICH, but that channel also spreads over the whole system bandwidth and is so not detectable to low cost MTC UEs which can operate only within a narrow bandwidth such as 1.4 MHz. So even if the frequency diversity issue could be solved with effective E-PDCCH PRB patterns, the normal PCFICH cannot be used to indicate to the low cost MTC devices the E-PDCCH region and the PRB pattern.
  • a method comprising: determining a number/, of frequency hops from at least a total number M of frequency selective candidate resources and a number N of the candidate resources that are used for the frequency hopping, where L, M and N are each positive integers; and one of sending or receiving control signaling according to a hopping pattern defined by the L frequency hops among the N candidate resources that are used for the frequency hopping.
  • an apparatus comprising at least one processor and at least one memory storing a computer program.
  • the at least one memory with the computer program is configured with the at least one processor to cause the apparatus to at least: determine a number L of frequency hops from at least a total number M of frequency selective candidate resources and a number N of the candidate resources that are used for the frequency hopping, where L, M and N are each positive integers; and one of send or receive control signaling according to a hopping pattern defined by the L frequency hops among the N candidate resources that are used for the frequency hopping.
  • a computer readable memory tangibly storing a computer program executable by at least one processor, the computer program comprising: code for determining a number L of frequency hops from at least a total number M of frequency selective candidate resources and a number Nof the candidate resources that are used for the frequency hopping, where L, M and N are each positive integers; and code for one of sending or receiving control signaling according to a hopping pattern defined by the L frequency hops among the N candidate resources that are used for the frequency hopping.
  • Figure 1 is a schematic diagram of OFDM symbol/time (horizontal axis) versus PRB/frequency (vertical axis) illustrating by outlining the E-PDCCH for each of four examples according to a first implementation of these teachings.
  • Figure 2 is similar to Figure 1 but outlining the E-PDCCH for each of two examples according to a second implementation of these teachings.
  • Figure 3 is similar to Figure 1 but outlining the E-PDCCH for each of two examples according to a third implementation of these teachings.
  • Figure 4 is a logic flow diagram that illustrates from the perspective of the network eNB and of the UE/MTC device the operation of a method, and a result of execution of computer program instructions embodied on a computer readable memory, in accordance with an exemplary embodiment of this invention.
  • Figure 5 is a simplified block diagram of a UE and an eNB which are exemplary electronic devices suitable for use in practicing the exemplary embodiments of the invention.
  • frequency hopping is allowed for PUSCH and SRS transmission.
  • the hopping pattern is slot based and preconfigured via higher layer signaling.
  • similar frequency hopping is also used to design the E-PDCCH.
  • the E-PDCCH hopping disclosed in the examples below is not a direct substitution from the current hopping method used by the PUSCH/SRS.
  • the E-PDCCH frequency hopping examples below differ from the TS 36.211 procedures for hopping PUSCH/SRS transmissions in at least the following ways:
  • the PRBs allowed for frequency hopping are predefined and denoted as ( i, P 2; ..., P M ). So in total there are PRBs allowed for frequency hopping, M being an integer greater than one. Note that these predefined hopping PRBs i, P 2 , and PM are not necessarily frequency continuous, so for example
  • the number of PRBs used for E-PDCCH in each hop is denoted as N and this number is signalled to the UE in the narrow band.
  • the number of frequency hopping, denoted as L can be determined implicitly or explicitly. Following are some examples of this. In a first example the value for L is implicitly determined based on number of PRBs for hopping, for example
  • L is explicitly indicated via higher layer signalling, or is explicit in that its value is predefined such as published in a RAT standard.
  • N PRBs in 5 ⁇ L OFDM symbols are used for the E-PDCCH, where Y is configured by higher layers or is predefined (such as for example Y ⁇ l 2).
  • Y is configured by higher layers or is predefined (such as for example Y ⁇ l 2).
  • the resource for E-PDCCH is determined as follows:
  • OFDM symbols 2 -if- ⁇ I S -f- ft are use d
  • PRBs P M , P m +i, ..., and P ffl +;v-i ar used
  • Figure 1 illustrates some exemplary different methods for this, denoted as examples A through D.
  • Figure 1 assumes the PRBs are indexed sequentially from the top (PRBs 1 through 6 are illustrated at the Figure 1 examples) so the shaded rows are those PRBs that are predefined for hopping in the various examples there.
  • Each example of Figure 1 spans one subframe so each horizontal block represents one OFDM symbol indexed left to right as 0 through 13.
  • the order 1 ,5,3 is a PRB priority order which is relevant so long as there are more PRBs than hops (M>L).
  • the predefined PRBs are noncontiguous to get more frequency diversity gain and the PRBs are listed with decreasing priority order.
  • the PRBs will be selected to be used according to the defined priority order.
  • PRB #1 will be used in the first hop and PRB #5 will be used in the second hop, with 6 symbols occupied per hop as shown by the outlining.
  • example C of Figure 1 there are M-6 predefined PRBs for hopping use and they are PRBs #1 to #6 in that priority order, and like examples A and B the OFDM symbols for hopping are indexed from 2 to 13 (Y-12).
  • the UEs can assume that the normal PDCCH will always occupy 2 OFDM symbols, or the number of OFDM symbols used in the first hop can be adjusted based on the number of OFDM symbols for normal PDCCH if signaled by the eNB (in any of various ways).
  • new signalling to the UE is introduced in the narrow band for indicating the start position of the first hop.
  • This indication can be used to carry information of OFDM symbol and PRB index used for the E-PDCCH.
  • the radio resources which are allowed to be a start position are predefined.
  • PRBs 1 and 2 in the first four OFDM symbols are the allowed candidates for the start position.
  • the selected hopping pattern and the E-PDCCH region can be implicitly derived from the indication of start position. So if the start position is indicated as the i ' -th OFDM symbol and the y ' -th PRB, then the below equations shows how the UE might determine the 2-hop hopping pattern the E-PDCCH is to follow.
  • FIG. 2 illustrates two non-limiting examples for how the hopping pattern is determined according to this second implementation.
  • the Figure 2 examples assume that 2 hops are predefined; and that it is also predefined that if the E-PDCCH starts in an odd-indexed PRB then 1 PRB is used for the hop, else if the E-PDCCH starts in an even-indexed PRB then 2 PRBs are used for the hop.
  • each diagram of Figure 2 spans one subframe so each horizontal block represents one OFDM symbol indexed left to right as 0 through 13.
  • the start position is OFDM symbol #2 and PRB #1.
  • PRB #1 in OFDM symbols 2-6 is used for the E-PDCCH
  • PRB #5 in OFDM symbols 7-13 is used for the E-PDCCH.
  • the specific OFDM symbols are determined from the example equations above. This example also assumes that a hopping step of 4 PRBs is preconfigured.
  • the E-PDCCH is shown specifically by outlining in the example A of Figure 2.
  • the start position is OFDM symbol #0 and PRB #2. Since this start position is an even-numbered PRB index the above rule tells that 2 PRBs are occupied for each hop. Therefore the first hop uses PRBs #2 and #3 in OFDM symbols 0-6 for the E-PDCCH, and the second hop uses PRBs #6 and #1 in OFDM symbols 7-13 for the E-PDCCH. As with example A of Figure 2, the specific OFDM symbols for each hop is determined from the equations above. The E-PDCCH is also shown specifically by outlining in the example B of Figure 2.
  • Figure 3 illustrates two non-limiting examples for how the hopping pattern is determined according to the third implementation of these teachings.
  • the Figure 3 examples achieves frequency diversity of the E-PDCCH by distributing the CCEs which make up the E-PDCCH in different PRBs, and in the Figure 3 examples each CCE of the E-PDCCH is distributed in a different PRB.
  • the resource element distribution of one CCE is implicitly determined by the CCE index and the hopping pattern (for example, the number of hops, the start position, etc.).
  • each CCE corresponds to 9 resource element groups, and there are 4 resource elements per group, (so each CCE consists of 36 resource elements); , and the regular PDCCH can be 1, 2, 4 or 8 CCEs depending on the PDCCH format and the channel status.
  • the regular PDCCH can be 1, 2, 4 or 8 CCEs depending on the PDCCH format and the channel status.
  • one CCE is distributed in multiple PRBs, and the distribution pattern is determined by the hopping pattern and CCE index,
  • CCE#2 is an even index so in the first hop it will occupy only one OFDM symbol (index 4) designated as 302 A and in the second hop will occupy two OFDM symbols (indices 8-9) designated as 302B. There are no further OFDM symbols available in the first hop to use for CCE#4 since example A of Figure 3 assumes slot-based hopping and the next symbol at position #7 (when indexed as 0...13 ) lies in the next slot of the subframe. The first two symbol positions 0-1 of the 7 total OFDM symbols that make up the first slot are reserved for legacy PDCCHs in this example.
  • CCE#4 will have no frequency hopping in Example A of Figure 3 and will instead occupy three OFDM symbols (indices 11-13) designated as 304B in the second hop/second slot.
  • the E-PDCCH is CCE #s 1-4 and only CCE #s 1 -3 have frequency diversity, which is maximized by using PRBs 1 and 6 for those CCEs.
  • each CCE occupies 1 OFDM symbol in each hop.
  • the available OFDM symbols 2-13 are divided into the number of hops (3) leaving 4 OFDM symbols per PRB.
  • the PRBs used for the E-PDCCH are every other one to maximize frequency diversity across the multiple hops.
  • CCE#1 occupies OFDM symbol 2 in PRB1 designated as 305A in the first hop, OFDM symbol 6 in PRB3 designated as 305B in the second hop, and OFDM symbol 10 in PRBS designated as 305C in the third hop.
  • CCE#2 occupies OFDM symbols 3, 7 and 1 1 in respective PRBs 1 , 3 and 5 for the respective first, second and third hops, designated respectively as 306A, 306B and 306C.
  • CCE #s 3 and 4 follow this same pattern but are not given reference numbers for example B of Figure 3. For this example frequency diversity is achieved in each CCE.
  • the number of hops L for each example is also (with or without the qualifier that L—2 for N-l) as was detailed above for the first implementation.
  • Embodiments of the invention detailed above provide certain technical effects, such as for example these hopping pattern implementations provide frequency diversity even if only one PRB is allocated for control signaling, and the control channel for that signaling (the E-PDCCH region in the examples) and pattern indication can be indicated via minimum signaling. [0039] Further technical effects of the above implementations is that the hopping patterns and the related signaling allows dynamic adjustment of the PRBs for the E-PDCCH (such as in the second implementation via the starting position indication) which helps to reduce/randomize the interference from adjacent cells.
  • the CCE distribution into multiple PRBs enables frequency diversity per CCE of the E-PDCCH, and the corresponding distribution pattern can be known implicitly based on the E-PDCCH hopping pattern and the CCE index.
  • Figure 4 may be performed by the whole eNB, or by one or several components thereof such as a modem, a processor in combination with a program stored on a memory, etc.
  • a number L of frequency hops is determined from at least a total number M of frequency selective candidate resources and a number N of the candidate resources that are used for the frequency hopping, where L, M and N are each positive integers.
  • control signaling is sent or received according to a hopping pattern defined by the L frequency hops among the N candidate resources that are used for the frequency hopping.
  • Blocks 402 and 404 recite using more general terms than the above non-limiting examples which were in the context of an LTE system.
  • the control signaling of block 404 is an E-PDCCH sent or received in one radio subframe of an E-UTRAN system; the candidate resources of block 402 are physical resource blocks; and the number L of block 402 is determined by the above non-limiting
  • the E-PDCCH occupies different OFDM symbols in different candidate physical resource blocks in each of the L frequency hops.
  • the hopping pattern is confined to a maximum bandwidth of 1.4 MHz.
  • Block 406 summarizes an aspect of the first implementation, where a value for N is signaled between a network access node that sends the control signaling of block 304 and a user equipment which receives the control signaling of block 404.
  • Block 408 gives further detail for the Figure 1 implementation in that M is predefined for frequency hopping of the control signaling/E-PDCCH; and in each of the L hops the N candidate physical resource blocks in L > L ⁇ OFDM symbols are used for the control signaling/E-PDCCH, where ⁇ is configured by higher layers or is predefined.
  • Figure 4 summarizes aspects of the second implementation at blocks 410 and 412. Namely, at block 410 a value for N is determined from an index of the candidate resource indicated in signaling between a network access node and a user equipment, in which that same signaling further indicates a start osition for a first of the L frequency hops.
  • Figure 4 further summarizes aspects of the third implementation at block 414 which provides that the control signaling comprises multiple control channel elements of which at least all but one are distributed among the N candidate resources in each hop of the hopping pattern.
  • the distribution of the control channel elements among the JV candidate resources is implicitly determined from an index of the respective control channel element, and from the hopping pattern.
  • the logic flow diagram of Figure 4 may be considered to illustrate the operation of a method, and a result of execution of a computer program stored in a computer readable memory, and a specific manner in which components of an electronic device are configured to cause that electronic device to operate.
  • the various blocks shown in Figure 4 may also be considered as a plurality of coupled logic circuit elements constructed to carry out the associated function(s), or specific result of strings of computer program code stored in a memory.
  • Such blocks and the functions they represent are non-limiting examples, and 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 integrated circuit.
  • the integrated circuit, or circuits may comprise 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.
  • an eNB 22 is adapted for communication over a wireless link 21 with an apparatus, such as a UE 20 embodied as a low cost MTC device as one non-limiting example.
  • the eNB 22 may be any access node (including frequency selective repeaters) of any wideband wireless network such as LTE, LTE-A, WCDMA, and the like.
  • the operator network of which the eNB 22 is a part may also include a network control element such as a mobility management entity MME and/or serving gateway SGW 24 which provides connectivity with further networks (e.g., a publicly switched telephone network and/or a data communications network/Internet).
  • a network control element such as a mobility management entity MME and/or serving gateway SGW 24 which provides connectivity with further networks (e.g., a publicly switched telephone network and/or a data communications network/Internet).
  • the UE 20 includes processing means such as at least one data processor (DP) 20A, storing means such as at least one computer-readable memory (MEM) 20B which tangibly stores at least one computer program (PROG) 20C or other set of executable instructions, and communicating means such as a transmitter TX 20D and a receiver RX 20E for bidirectional wireless communications with the eNB 22 via one or more antennas 20F, Also stored in the MEM 20B at reference number 20G are the rules or algorithm for determining the frequency hopping pattern for the E-PDCCH (or other control channel) as detailed above in the various exemplary but non-limiting embodiments.
  • D data processor
  • MEM computer-readable memory
  • PROG computer program
  • the eNB 22 also includes processing means such as at least one data processor (DP) 22A, storing means such as at least one computer-readable memory (MEM) 22B that tangibly stores at least one computer program (PROG) 22C or other set of executable instructions, and communicating means such as a transmitter TX 22D and a receiver RX 22E for bidirectional wireless communications with the UE 20 via one or more antennas 22F.
  • the eNB 22 stores at block 22G similar rules or algorithm for determining the frequency hopping pattern for the E-PDCCH or other control channel as detailed above.
  • the MME 24 is also shown to have a processor DP 24A, a memory 24B storing a program 24C and a modem 24H for digitally modulating and demodulating data it communicates over the data and control link 25 with the eNB 22.
  • the UE 20 or eNB 22 While not particularly illustrated for the UE 20 or eNB 22, those devices are also assumed to include as part of their wireless communicating means a modem and/or a chipset which may or may not be inbuilt onto an RF front end chip within those devices 20, 22 and which also operates utilizing the new DCI format according to these teachings.
  • At least one of the PROGs 20C in the UE 20 is assumed to include a set of program instructions that, when executed by the associated DP 20A, enable the device to operate in accordance with the exemplary embodiments of this invention, as detailed above.
  • the eNB 22 also has software stored in its MEM 22B to implement aspects of these teachings relevant to it as detailed above for Figure 4.
  • the exemplary embodiments of this invention may be implemented at least in part by computer software stored on the MEM 20B, 22B which is executable by the DP 20A of the UE 20 and/or by the DP 22A of the eNB 22, or by hardware, or by a combination of tangibly stored software and hardware (and tangibly stored firmware).
  • Electronic devices implementing these aspects of the invention need not be the entire devices as depicted at Figure 5 or may be one or more components of same such as the above described tangibly stored software, hardware, firmware and DP, or a system on a chip SOC or an application specific integrated circuit ASIC.
  • the various embodiments of the UE 20 can include, but are not limited to personal portable digital devices having wireless communication capabilities, including but not limited to cellular telephones, navigation devices, laptop/palmtop/tablet computers, digital cameras and music devices, and Internet appliances, as well as the machine-to -machine type devices mentioned above.
  • Various embodiments of the computer readable MEMs 20B, 22B include any data storage technology type which is suitable to the local technical environment, including but not limited to semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, removable memory, disc memory, flash memory, DRAM, SRAM, EEPROM and the like.
  • Various embodiments of the DPs 20A, 22A include but are not limited to general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and multi-core processors.
  • LTE E-UTRAN evolved UTRAN

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Selon l'invention, un motif de saut est défini par L sauts de fréquence parmi N ressources candidates. L est déterminé à partir au moins d'un nombre total M de ressources candidates sélectives en fréquence. N est le nombre de ressources candidates qui sont utilisées pour le saut de fréquence. Une signalisation de commande telle qu'un E-PDCCH est envoyée par un réseau à un UE conformément à ce motif de saut afin de réaliser une diversité de fréquence. Dans les exemples, les ressources candidates sont des blocs de ressources physiques (PRB). Selon un mode de réalisation, L=K quand N=1 et L=1 autrement (K est prédéfini par le réseau) ; selon un autre mode de réalisation, L =IM /N1. Dans les exemples, l'E-PDCCH occupe différents symboles OFDM dans différents PRB candidats dans chacun des L sauts de fréquence. Confiner le motif de saut à une bande passante maximale de 1,4 MHz permet à des dispositifs de communication du type machine à bas coût d'obtenir un E-PDCCH qui donne leur attribution de ressources.
PCT/CN2012/070236 2012-01-11 2012-01-11 Conception de canal de commande pour utilisateurs à faible bande passante Ceased WO2013104119A1 (fr)

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WO2016129959A1 (fr) * 2015-02-12 2016-08-18 Lg Electronics Inc. Procédé et appareil permettant la prise en charge de saut de fréquence pour un équipement utilisateur à bas prix dans un système de communication sans fil
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CN108124310A (zh) * 2016-11-29 2018-06-05 华为技术有限公司 一种跳频通信方法及其设备
WO2018099166A1 (fr) * 2016-11-29 2018-06-07 华为技术有限公司 Procédé de communication à saut de fréquence et dispositif associé
US10574289B2 (en) 2016-11-29 2020-02-25 Huawei Technologies Co., Ltd. Frequency hopping communication method and device
CN108124310B (zh) * 2016-11-29 2020-04-14 华为技术有限公司 一种跳频通信方法及其设备
US10873364B2 (en) 2016-11-29 2020-12-22 Huawei Technologies Co., Ltd. Frequency hopping communication method and device
WO2018141125A1 (fr) * 2017-02-04 2018-08-09 中兴通讯股份有限公司 Procédé et dispositif de transmission d'informations
CN109391385A (zh) * 2017-08-02 2019-02-26 北京奇虎科技有限公司 物理上行控制信道设置方法及用户设备

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