WO2014085997A1 - Appareils, procédés et programmes informatiques liés aux améliorations des transmissions dmrs - Google Patents

Appareils, procédés et programmes informatiques liés aux améliorations des transmissions dmrs Download PDF

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Publication number
WO2014085997A1
WO2014085997A1 PCT/CN2012/085910 CN2012085910W WO2014085997A1 WO 2014085997 A1 WO2014085997 A1 WO 2014085997A1 CN 2012085910 W CN2012085910 W CN 2012085910W WO 2014085997 A1 WO2014085997 A1 WO 2014085997A1
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WO
WIPO (PCT)
Prior art keywords
reference signals
control information
terminal
absence
data field
Prior art date
Application number
PCT/CN2012/085910
Other languages
English (en)
Inventor
Pengfei Sun
Chunyan Gao
Na WEI
Erlin Zeng
Wei Bai
Haiming Wang
Original Assignee
Broadcom Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to PCT/CN2012/085910 priority Critical patent/WO2014085997A1/fr
Publication of WO2014085997A1 publication Critical patent/WO2014085997A1/fr

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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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

Definitions

  • the present invention relates to apparatuses, methods and computer program products configured to achieve improvements in relation to transmission of demodulation reference signal, DMRS. Background
  • a typical scenario or environment in relation to a scenario to which some aspects of the present invention are applicable is for example a scenario as applied in conjunction with e.g. the LTETM (Long Term Evolution) or LTE-ATM (LTE- advanced) telecommunication standard. Some aspects at least can also be applicable to other wireless communication scenarios.
  • a network transceiver device such as an evolved NodeB, eNB, communicates via control and payload channels with a terminal such as an user equipment UE.
  • a goal is to achieve error free data transmission.
  • data transmission from a network transceiver device such as an evolved NodeB, eNB
  • a terminal such as an user equipment, UE
  • eNB transmits so-called reference signals and/or symbols to the UE.
  • the UE being in receipt of and thus aware of the reference signals/symbols, uses these reference symbols to estimate the channel, and is subsequently enabled to properly decode payload transmissions received via that channel.
  • Such reference symbols are assigned to (specific) physical resource elements RE within physical resource blocks PRB.
  • a resource element RE is represented by a certain time interval and a frequency (bandwidth) assigned to it within the frequency-time domain.
  • a plurality (defined number) of resource elements in frequency / bandwidth domain form a physical resource block PRB (in frequency domain), and a plurality of PRBs are present within a channel.
  • a Resource Element RE is the smallest unit of transmission resource in LTE, in both uplink and downlink.
  • An RE consists of 1 subcarrier in the frequency/bandwidth domain for a duration of 1, Orthogonal Frequency Division Multiplexing (OFDM) or Single Carrier- Frequency Division Multiplexing (SC-FDM), symbol in the time domain.
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDM Single Carrier- Frequency Division Multiplexing
  • a PRB in turn is thus a unit of transmission resources consisting of 12 sub- carriers (REs) in the frequency domain and 1 timeslot (0.5 ms) in the time domain.
  • a radio frame comprises twenty such time-slots, while each time- slot normally consists of 7 OFDM symbols.
  • Plural PRBs are grouped to a resource block group, RBG.
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • a feedback in uplink from the UE to the eNB consists of e.g. a rank indicator (RI), a pre-coding matrix index (PMI) and a channel quality indicator (CQI) and hybrid automatic repeat requests HARQ.
  • RI rank indicator
  • PMI pre-coding matrix index
  • CQI channel quality indicator
  • hybrid automatic repeat requests HARQ hybrid automatic repeat requests
  • Such feedback is e.g. carried in a physical uplink control channel, PUCCH.
  • the UE estimates the channel based on the received DMRS, selects rank and PMI and calculates the post-processing (after receiver) SINR (signal to interference noise ratio) and derives the CQI based on that.
  • SINR signal to interference noise ratio
  • One of the unique features of a local area network compared with the macro area network is the characteristics of the channel response. Due to the small coverage of local area networks, the channel delay spread is found much smaller than that of a macro channel. This is leading to a much flatter frequency domain response of local area networks' channels. In addition, as the local area network targets UEs with low mobility speed, a small Doppler shift can be expected for the channel used by such slowly moving terminals.
  • the reference signal(s) used in the physical layer transmission all the reference signals, either cell specific or UE specific, are designed for the macro channel, which may suffer large delay spread and high Doppler shift. According to the Nyquist sampling rate, the reference signals must be dense enough in time and frequency domain to achieve accurate channel estimation. However, these dense reference signals are not so necessary in local area network given the flat and slow varying channels of the local area network. The reference signal overhead may be reduced without compromising the performance. Therefore, it is proposed to study a possible reduction of the reference signal and related control overhead. It is likely that the RS density could be reduced in the time domain.
  • DMRS which is used for demodulation in local area network (CRS (Common Reference Signal) free new carrier type), may be periodically avoided in certain subframes to reduce the overhead.
  • CRS Common Reference Signal
  • the demodulation could be based on those channel estimates that were previously obtained.
  • issues may be introduced if such DMRS blank subframes are supported:
  • DMRS Downlink Reference Signal
  • an apparatus as defined in claim 1, and
  • a method as defined in claim 47 According to an aspect of the present invention (e.g. related to a terminal such as a user equipment, UE), there is provided
  • Such computer program products also encompass computer readable storage media comprising a set of computer-executable instructions which, when the program is run on a device (or on a processor or processing unit thereof which may be part of a controller or control unit or control module, or any other suitable (hardware or software implemented) means for controlling), such as a terminal UE and its processor, or a network transceiver device eNB and its processor, cause the device to perform the respective method aspects.
  • a terminal UE and its processor or a network transceiver device eNB and its processor, cause the device to perform the respective method aspects.
  • the above mentioned computer program product/products may be embodied as a computer-readable storage medium.
  • such signalling includes new DCI bits, new DCI formats, and/or a new RRC signalling,
  • the elNB and U E easily use and adopt such signalling in relation to configured DMRS to be transmitted and/or received, respectively,
  • a control overhead may be only 1 or 2 bits for one subframe, according to at least an example of an aspect of the invention, compared to a reduction of DMRS, i.e. a RS saving, of at least 12 RE per PRB; hence, given that the PDSCH normally takes many PRBs, the saving will outweigh the overhead, and/or
  • Some embodiments of the present invention can be applied to/embodied in relation to wireless communication systems and scenarios (e.g. in relation to LTE radio access or LTE-A radio access or other future 3GPP releases), in particular in
  • modems and/or wireless devices and/or modules and/or chipsets thereof in particular those related to/inserted in or insertabie to devices such as terminals such as user equipments or “smartphones” or the like, as well as those related to/inserted in or insertabie to network transceiver devices such as a Node_B or evolved Node_B eNB.
  • Fig. 1 illustrates one example of a network transceiver device eNB and a terminal UE and some signalling exchanged between, as well as an outline of their internal construction, and
  • Fig. 2 illustrates one example of a normal DMRS pattern in Fig. 2A, and one example of a reduced DMRS pattern in Fig. 2B, resulting from at least some aspect of the invention being applied;
  • Fig. 3 illustrates one example of the basic flowchart for a processing as carried out on a side of a network transceiver device such as a eNB, and
  • Fig. 4 illustrates one example of the basic flowchart for a processing as carried out on a side of a terminal device such as a UE.
  • the invention is implemented in a framework of e.g. a telecommunication system operating for example according to the LTE and/or LTE-A standard, or subsequent versions thereof, and more particularly, the invention affects a terminal (user equipment UE) as well as a network transceiver device (evolved NodeJ3) eNB operated within such a framework.
  • a terminal user equipment UE
  • a network transceiver device evolved NodeJ3
  • eNB evolved NodeJ3
  • the description refers to such modules or devices or apparatuses related to user equipments, UEs, which conform to the LTE / LTE-A standard and are arranged / configured for communication with correspondingly configured network transceiver devices such as evolved NodeB's, eNBs, as the wireless communication modules or devices or apparatuses.
  • Fig . 1 illustrates one example of a network transceiver device eNB and a terminal UE and some signalling exchanged between, as well as an outline of their internal construction .
  • Fig. 1 illustrates one example of a typical scenario to which aspects of the invention are applicable and applied.
  • a network transceiver device such as a eNB, denoted by A, applies reduction of DMRS transmission for downlink transmission of (control) data to a terminal, e.g. a user equipment UE denoted by B.
  • the (control) data carried in downlink comprise at least DL control channels such as the PDSCH and the PDCCH.
  • At least the PDCCH as one of the DL control channels carries also control information, e.g. known as downlink control information, DCI.
  • Downlink Control Information is used to describe control signalling messages transmitted on the Physical Downlink Control Channel (PDCCH), including for example downlink resource assignments (for the Physical Downlink Shared Channel (PDSCH)) and uplink transmission grants (for the Physical Uplink Shared Channel (PUSCH)).
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • PUSCH Physical Uplink Shared Channel
  • the terminal B feeds back feedback control signals in uplink, UL, to the eNB A.
  • the uplink feedback comprises at least an uplink control channel such as the PUCCH.
  • Data and/or signals carried on the PUCCH comprise, for example, at least CSI/CQI information and HARQ related information (ACKs/NAC s).
  • the uplink feedback of the terminal UE B is at least partly derived based on evaluation of DMRS signals transmitted by the network transceiver device eNB A in downlink.
  • the eNB A comprises an apparatus 1, which in turn comprises at least a controller (or control module) 11 which is configured to control, among other parts of the eNB (not shown/discussed herein) a receiver/ transmitter (or transceiver module) 12 of the eNB, at least in terms of DMRS transmission.
  • the receiver/transmitter Rx/Tx 12, under control of the controller 11, is caused to transmit in the PDSCH and/or PDCCH in DL to the terminal UE B.
  • the receiver/transmitter Rx/Tx 12, under control of the controller 11, is caused to receive the PUCCH in UL from the terminal UE B.
  • the receiver/transmitter 12 is bi-directionally connected to the controller 11, which in turn is bi-directionally connected to a memory MEM 13.
  • the memory stores various data, such as control code or the like used by the controller, data contained in feedback signals received in UL, data to be included in downlink control channels transmitted in DL, etc.
  • a terminal device such as a UE, denoted by B, is enabled to cope with a reduction of DMRS transmission in downlink transmission of (control) data to a terminal, e.g. from a eNB denoted by A.
  • the (control) data received in downlink comprise at least DL control channels such as the PDSCH and the PDCCH.
  • At least one of the DL control channels carries also control information, e.g. known as downlink control information, DCL
  • the terminal B causes to feed back feedback control signals in uplink, UL, to the eNB A.
  • the uplink feedback comprises at least an uplink control channel such as the PUCCH.
  • Data and/or signals carried on the PUCCH comprise, for example, at least CSI/CQI information and HARQ related information (ACKs/NACKs).
  • the uplink feedback of the terminal UE B is at least partly derived based on evaluation of DMRS signals transmitted by the network transceiver device eNB A in downlink.
  • the UE B comprises an apparatus 2, which in turn comprises at least a controller (or control module) 21 which is configured to control, among other parts of the UE (not shown/discussed herein) a receiver/ transmitter (or transceiver module) 22 of the UE, at least in terms of DMRS reception.
  • the receiver/transmitter Rx/Tx 22, under control of the controller 21, is caused to receive the PDSCH and/or PDCCH in DL from the eNB.
  • the receiver/transmitter Rx/Tx 22, under control of the controller 21, is caused to transmit the PUCCH in UL to the eNB.
  • the receiver/transmitter 12 is bi-directionally connected to the controller 21, which in turn is bi-directionally connected to a memory MEM 23.
  • the memory stores various data, such as control code or the like used by the controller, data caused to be included in feedback signals transmitted in UL, data included in downlink control channels received in DL, and/or other data, e.g. configuration data, measurement data obtained by a measurement module ((not shown), which could be associated to e.g. the control module 21 or the Rx/Tx module 22, (or be regarded as a separate module of the UE B)).
  • data such as control code or the like used by the controller, data caused to be included in feedback signals transmitted in UL, data included in downlink control channels received in DL, and/or other data, e.g. configuration data, measurement data obtained by a measurement module ((not shown), which could be associated to e.g. the control module 21 or the Rx/Tx module 22, (or be regarded as a separate module of the UE B)).
  • a UE decodes the control channel based on regular or reduced DMRS, and there is no error case in terms of the presence of DMRS in the PRB set corresponding to the search space of the control channel.
  • one or a few bits in the DCI format are added/reused, or a new RNTI is applied, by the eNB to indicate to one or more terminals UE whether a current subframe contains DMRS for a UE's channel estimation. If "yes”, UE will find the DMRS in the pre-defined or indicated resources within current subframe to perform channel estimation, whereas if "No", the UE will assume that no DMRS is available in the current subframe. In such case, instead, the UE re-uses previously obtained channel estimates.
  • an example of introducing a DMRS indicator in an existing DCI format is as follows.
  • the definition of DCI format for DL grant, for example DCI format 1, is amended as shown below.
  • the part marked bold is the new content added.
  • DCI format 1 is used for the scheduling of one PDSCH codeword in one cell.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • the UE knows if the DMRS indicator field is present based on higher layer configuration. Then, if UE receives the DNRS indicator bit with value "1", the UE knows that DMRS is transmitted within this subframe and updates the channel estimates based on the said DMRS. If UE receives the DMRS bit with value w 0", the UE is aware that this subframe does not include DMRS and hence uses the previously obtained channel estimates for PDSCH demodulation.
  • DMRS is transmitted in a reduced frequency density in the current subframe to improve spectrum efficiency.
  • UE knows the exact DMRS pattern by specification or by higher layer signalling.
  • One more alternative is to derive the 1 bit DMRS indication implicitly based on the resource allocation field in the DCI. If the allocated resource is outside a certain BW threshold to the previous DMRS transmission resource, then assume the bit is set as "1", which means there is DMRS transmission; otherwise, it is assumed that no DMRS exists.
  • the derivation of the bit can also be determined by a combination of BW threshold and a time threshold.
  • One more alternative is to use the new indicator to adjust the DMRS pattern on a per subframe basis.
  • bit fields can be used to represent different DMRS density in the frequency domain, e.g., if the bit is set to 1 then UE should assume DMRS is present in one out of each N PRB (where N is a positive integer and is greater than 1), while if bit is set to 0 then UE assume DMRS is present in every PRB.
  • a new DCI format for DMRS fast configuration is introduced.
  • the DMRS configuration of a group of UEs is included in this DCI, with each UE having e.g. one or two bits for its own DMRS configuration.
  • the new DCI format may be transmitted by the eNB only when the DMRS setup is changed. Otherwise, the UE (or group of UEs) assumes that the DMRS pattern is the same as the one in the previous subframe.
  • Different groups can be identified via RNTI, or by means of a group-ID embedded as one field in the new DCI format.
  • RNTIs are used to identify terminals UE within E-UTRAN (Evolved Universal Terrestrial Radio Access Network), in particular in signalling messages between the UE and E-UTRAN.
  • C-RNTI Cell- RNTI
  • P-RNTI Paging-RNTI
  • RA-RNTI Random Access-RNTI
  • SI-RNTI System Information-RNTI
  • DCI formats 0 to 3 are hitherto defined, cf. 3GPP TS 36.212, version 8.8.0, Release 8, and at least some of those encompass "subformats" ranging from A through D.
  • new DCI formats carrying information as suggested under at least some aspects of the present invention could be labelled as DCI formats 4 or 5, for example.
  • some examples of implementation to realize indicating the DMRS configuration for a group of UEs is given below.
  • a new DCI format is, for example, defined as follows as e.g. format 5 :
  • DCI format 5 is used for the transmission of indication of the
  • the parameter dmrs-Index provided by higher layers determines the index to the DMRS indicator for a given UE.
  • each UE monitors the DCI format 5 after configuration by higher layers, from which UE also knows its own corresponding DMRS index in the DCI format 5. If UE receives "1", UE knows DMRS is transmitted within this subframe and performs an update of the channel estimates based on the said DMRS. If UE receives "0", UE uses the previously obtained channel estimates for PDSCH demodulation.
  • N groups of terminals UE can be controlled in terms of DMRS reception/channel updates.
  • Each UE knows its DMRS index, pointing to one out of the N DMRS indicators.
  • DCI format 5 is used for the transmission of indication of the presence of DMRS for PDSCH with 1-bit indicator
  • the parameter dmrs-Index provided by higher layers determines the index to the DMRS indicator for a given UE.
  • each UE monitors the DCI format 5 after configuration by higher layers, from which UE also knows its own corresponding DMRS index in the DCI format 5. If a UE receives the respective UE knows that the DMRS status within this subframe is changed from the previous subframe. That is, if the previous subframe has no DMRS, then DMRS is transmitted in this subframe and vice versa. If a UE receives "0", the respective UE assumes that the DMRS status is unchanged.
  • a semi-static D RS cycle is configured by an eNB for each UE instead of indicating the presence of DMRS every subframe.
  • the respective UE finds the first PDSCH transmission with DMRS as the reference. Then, the respective UEs shall assume (or learn based on a validity information included in the control information received from eNB) that no DMRS is transmitted in the following N (within a configured cycle) subframes unless there is additional L1/L2 signalling received to indicate a new configuration or an independent DMRS during the DMRS cycle.
  • N within a configured cycle
  • L1/L2 signalling received to indicate a new configuration or an independent DMRS during the DMRS cycle.
  • certain restrictions are needed.
  • One approach could be that UE and eNB shall always assume the presence of DMRS until the first A/N is transmitted back to the eNB.
  • Another alternative is that different offset can be explicitly configured or implicitly defined for different UE or UE groups. In such case, the eNB may always schedule certain UE on its first subframe with certain offset to contain DMRS.
  • the higher layer configures a cycle for DMRS transmission, that is, defines how long in the time domain a DMRS is transmitted.
  • UE monitors the PDCCH and finds the first DL grant for PDSCH transmission, and then, the UE considers this PDSCH as the first occasion that DMRS is transmitted . Then UE calculates the next occasion when the DMRS can be transmitted. During the period in between, UE assumes no DMRS transmission and channel estimates obtained in the first DMRS occasion is stored and used . However, if the first DMRS is missed due to erroneous PDCCH detection, then UE has no channel estimates for following subframes before the second DMRS is transmitted. In such case serious errors are caused. Therefore, the DMRS scheduling restriction could be introduced to prevent errors.
  • eNB could transmit PDSCH with DM RS before the first A/N is sent back to eNB, then eNB knows at least one DMRS is received by the UE, then the semi-static DMRS cycle could be applied. On the UE side, it could always assume the presence of DMRS before the first A/N is sent back to eNB. After sending back A/N bits, UE will follow the semi-static DMRS cycle.
  • a validity information to the control information, the validity information indicating the validity of presence or absence of reference signals for a specified duration in time domain.
  • the validity can be indicated in units of seconds or ms, or in units of subframes, or the like.
  • certain rules are defined to allow PDSCH resources shifted from the DMRS resource. If PDSCH resource is shifted from the DMRS resource within a certain range, UE could use the channel estimates based on the DMRS to demodulate PDSCH .
  • the range of shift could be configured by higher layer signalling in units of PRBs.
  • the eNB ensures that the PDSCH and DMRS resource shift is kept within the configured range, and the UE performs PDSCH demodulation based on the channel estimates obtained from the closest DMRS resources in the bandwidth/time space.
  • PDSCH "content" is transmitted in the resources previously assigned for DMRS.
  • Demodulation of such "newly allocated” PDSCH content is accomplished based on channel estimates derived from "neighbouring" DM RS resources, i.e. those closely located to the PDSCH resources in at least time and/or bandwidth within the grid of REs of PRBs or RGBs.
  • the controller (on eNB side) is configured to generate control information by assigning an indication that data of a downlink shared channel being transmitted in those resources not used for reference signal transmission within both the first and the second set but the distance to the resources used for reference signal transmission in time and/or frequency domain is kept within an indicated range.
  • Corresponding configuration/adaptation is made at UE side.
  • aspect 4 can be combined with all other aspects in that in non-DMRS assigned resources of PRBs, data of the PDSCH can be allocated.
  • aspect 3 can be combined with all other aspects in that it is pre-configured, how long the principles of those aspects shall be valid/applicable.
  • FIG. 2 illustrates one example of a normal DMRS pattern in Fig. 2A, and one example of a reduced DMRS pattern in Fig. 2B, resulting from at least some aspect of the invention being applied.
  • a plural of resource elements RE are arranged in a grid in bandwidth (vertically illustrated) and time (horizontally illustrated). Those REs form one or more PRBs or even RGBs. Selected or predetermined ones of the REs are assigned to carry DMRS (illustrated in different representation compared to non-DMRS REs).
  • a "normal" DMRS pattern is illustrated as an example.
  • 36 REs carry DMRS within a time range covering time slots i until wherein in time slots i, i+2, i+4, ... until i+10 DMRS REs are present within subcarriers number 2, 7, and 12, respectively.
  • a "reduced" DMRS pattern obtained by one or more aspects of the invention as described above is illustrated as an example.
  • 12 REs only carry DMRS within a time range covering time slots i until i+11, wherein only in time slots i and i+10 DMRS REs are present within subcarriers number 2, 7, and 12, respectively.
  • DMRS is thus reduced in time domain only.
  • DMRS could be reduced in bandwidth domain only.
  • such pattern could be modified in that DMRS is removed from subcarriers 7 only over the time range of timeslots i to i+11, or from subcarriers 1 and 7, or the like.
  • DMRS reduction can be accomplished in time and frequency/bandwidth domain.
  • such pattern could be modified in that DMRS is further removed from subcarriers 7 over the time range of timeslots i to i+11 (resulting in only 8 REs carrying DMRS in such case), or the like.
  • FIG. 3 illustrates a basic flowchart for a processing as carried out on a side of a network transceiver device such as a eNB according to one embodiment of the invention.
  • the processing is carried out in an apparatus (e.g. of a eNB operating e.g. according to LTE or LTE- A) comprising at least a controller having an appropriate configuration as set out above in regard to some aspects.
  • the process starts in a stage S30.
  • the controller causes a first set of reference signals to be transmitted at specific locations within a time and frequency resource grid.
  • the controller receives information indicative of a usability of a second set of reference signals within the resource grid, the second set comprising less reference signals as compared to the first set.
  • the controller analyses the received information, and responsive thereto, in a stage S34, generates control information.
  • the controller causes to apply the second set of reference signals at specific locations within the time and frequency resource grid to be transmitted, and further (stage S36) causes to transmit the generated control information in downlink so as to inform terminals being in communication with said apparatus of said second set of reference signals being applied.
  • the process then "ends" in a stage S37, which may imply that it is waited for information indicative of the 2 nd set being not useable any longer, or any other signalling e.g. on L1/L2 indicative of terminating the usage of the 2 nd set, or a validity of the control information expires, or the like.
  • the second set of reference signals comprises less reference signals as compared to the first set in at least one of time domain and frequency domain.
  • the second set of reference signals differs from the first set in time domain in terms of the timeslots in which the reference signals are present or not, and/or differs in frequency domain in terms of the subcarriers in which the reference signals are present or not.
  • the controller is configured to receive the information indicative of the usability of the second set of reference signals from a network management entity as configuration information for said apparatus.
  • the configuration information received causes said apparatus to be configured for use as a network transceiver device of a local area network environment.
  • the controller is configured to receive the information indicative of the usability of the second set of reference signals from a terminal device.
  • the information indicative of the usability of the second set of reference signals received from the terminal device is based on a channel delay spread for the terminal being below a threshold.
  • the controller is configured to generate control information by assigning an indication of presence or absence of reference signals for at least one terminal, to at least one specific data field in a downlink control information message for said terminal.
  • the at least one specific data field comprises at least one existing re-used or at least one added bit of a downlink control information message, or a specific type of terminal identifier.
  • the at least one specific data field comprises a downlink control information message format, comprising an index for a respective terminal to assign the respective terminal to one of at least one of indicators of presence or absence of reference signals, and a value for each of said at least one of indicators indicating presence or absence of reference signals for each of the terminals indexed to that indicator.
  • the at least one specific data field comprises a downlink control information message format, comprising an index for a respective terminal to assign the respective terminal to one of at least one of indicators of presence or absence of reference signals, and a value for each of said at least one of indicators indicating a change in terms of presence or absence of reference signals for each of the terminals indexed to that indicator.
  • the controller is configured to generate control information by further assigning a validity information to said control information, the validity information indicating the validity of presence or absence of reference signals for a specified duration in time domain.
  • the controller is configured to generate control information by assigning an indication that data of a downlink shared channel being transmitted in those resources not used for reference signal transmission within both the first and the second set but the distance to the resources used for reference signal transmission in time and/or frequency domain is kept within an indicated range.
  • Fig. 4 illustrates a basic flowchart for a processing as carried out on a side of a terminal device (such as a UE) according to one embodiment of the invention.
  • the processing is carried out in an apparatus (e.g. of a terminal UE operating e.g. according to LTE or LTE-A) comprising at least a controller having an appropriate configuration as set out above in regard to some aspects.
  • an apparatus e.g. of a terminal UE operating e.g. according to LTE or LTE-A
  • a controller having an appropriate configuration as set out above in regard to some aspects.
  • the process starts in a stage S40.
  • the controller causes a receiver to receive a first set of reference signals at specific locations within a time and frequency resource grid.
  • the controller causes to transmit information indicative of a usability of a second set of reference signals within the resource grid, the second set comprising less reference signals as compared to the first set.
  • the apparatus and/or its controller receives control information.
  • the controller analyses the received control information, and responsive thereto, in a stage S45, causes to apply, at the receiver, the second set of reference signals at specific locations within the time and frequency resource grid for reception.
  • the process then "ends" in a stage S46, which may imply that it is waited for information indicative of the 2 nd set being not used any longer, or any other signalling e.g. on L1/L2 indicative of terminating the usage of the 2 nd set, or a validity of the control information expires, or the like.
  • the second set of reference signals comprises less reference signals as compared to the first set in at least one of time domain and frequency domain .
  • the second set of reference signals differs from the first set in time domain in terms of the timeslots in which the reference signals are present or not, and/or differs in frequency domain in terms of the subcarriers in which the reference signals are present or not.
  • the transmitted information indicative of the usability of the second set of reference signals is based on a channel delay spread for the terminal being below a threshold.
  • the controller is configured to receive and analyse control information based on an assigned indication of presence or absence of reference signals for at least one terminal, to at least one specific data field in a downlink control information message for said terminal.
  • the at least one specific data field comprises at least one existing re-used or at least one added bit of a downlink control information message, or a specific type of terminal identifier.
  • the at least one specific data field comprises a downlink control information message format, comprising an index for a respective terminal to assign the respective terminal to one of at least one of indicators of presence or absence of reference signals, and a value for each of said at least one of indicators indicating presence or absence of reference signals for each of the terminals indexed to that indicator.
  • the at least one specific data field comprises a downlink control information message format, comprising an index for a respective terminal to assign the respective terminal to one of at least one of indicators of presence or absence of reference signals, and a value for each of said at least one of indicators indicating a change in terms of presence or absence of reference signals for each of the terminals indexed to that indicator.
  • the controller is configured to receive and analyse control information based on a further assigned validity information to said control information, the validity information indicating the validity of presence or absence of reference signals for a specified duration in time domain.
  • the controller is configured to receive and analyse control information based on an assigned indication that data of a downlink shared channel being transmitted in those resources not used for reference signal transmission within both the first and the second set but the distance to the resources used for reference signal transmission in time and/or frequency domain is kept within an indicated range.
  • some embodiments of the invention may be implemented in software, hardware, application logic or a combination thereof, i.e. a combination of software, hardware and application logic.
  • the software, application logic and/or hardware generally reside on control modules or modems, in general circuitry.
  • the application logic, software or an instruction set is maintained on any one of various conventional computer-readable media.
  • a computer-readable medium may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer or smart phone, or user equipment.
  • circuitry refers to all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and
  • processor(s)/software including digital signal processor(s)
  • software including digital signal processor(s)
  • memory(ies) that work together to cause an apparatus, such as a mobile phone or user equipment or any other terminal, or network entity such as a server, to perform various functions
  • circuits such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone (terminal) or a similar integrated circuit in server, a cellular network device, or other network device. That is, it can be implemented as/in chipsets to such devices, and/or modems thereof.
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • an apparatus comprising a controller configured to cause a first set of reference signals to be transmitted at specific locations within a time and frequency resource grid, receive information indicative of a usability of a second set of reference signals within the resource grid, the second set comprising less reference signals as compared to the first set, analyse the received information, and responsive thereto generate control information, and cause to apply the second set of reference signals at specific locations within the time and frequency resource grid to be transmitted, and cause to transmit the generated control information in downlink so as to inform terminals being in communication with said apparatus of said second set of reference signals being applied.
  • a corresponding apparatus in terms of a terminal device of e.g. a UE is also provided as well as respective corresponding methods and computer program products.

Landscapes

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

Abstract

Selon au moins un aspect, la présente invention concerne, sous un dispositif émetteur/récepteur de réseau ayant l'aspect d'un eNB par exemple, un appareil comprenant un dispositif de commande conçu de sorte à transmettre un premier ensemble de signaux de référence à des emplacements spécifiques dans une grille de ressource de temps et de fréquence, qui reçoit des informations indiquant la possibilité d'utiliser un second ensemble de signaux de référence dans la grille de ressource, le second ensemble comprenant moins de signaux de référence que le premier ensemble, analyse les informations reçues, et génère en réponse des informations de commande, et provoque l'application du second ensemble de signaux de référence à des emplacements spécifiques dans la grille de ressource de temps et de fréquence devant être transmise, et provoque la transmission des informations de commande générées en liaison descendante de sorte à informer les terminaux en communication avec ledit appareil de l'application du second ensemble de signaux de référence. La présente invention concerne également un appareil correspondant en tant que dispositif de terminal d'un EU par exemple ainsi que des procédés et des programmes informatiques correspondants respectifs.
PCT/CN2012/085910 2012-12-05 2012-12-05 Appareils, procédés et programmes informatiques liés aux améliorations des transmissions dmrs WO2014085997A1 (fr)

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